Merge pull request #141 from squeed/missing-mac

pkg/ip: re-fetch the created link to return creation-time parameters

.appveyor.yml

@@ -0,0 +1,28 @@
+clone_folder: c:\gopath\src\github.com\containernetworking\plugins
+
+environment:
+  GOPATH: c:\gopath
+
+install:
+  - echo %PATH%
+  - echo %GOPATH%
+  - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+  - go version
+  - go env
+
+build: off
+
+test_script:
+  - ps: |
+      go list ./... | Select-String -Pattern (Get-Content "./plugins/linux_only.txt") -NotMatch > "to_test.txt"
+      echo "Will test:"
+      Get-Content "to_test.txt"
+      foreach ($pkg in Get-Content "to_test.txt") {
+        if ($pkg) {
+          echo $pkg
+          go test -v $pkg
+          if ($LastExitCode -ne 0) {
+            throw "test failed"
+          }
+        }
+      }

.travis.yml

@@ -3,12 +3,12 @@ sudo: required
 dist: trusty
 
 go:
-  - 1.7.x
   - 1.8.x
+  - 1.9.x
 
 env:
   global:
-  - PATH=$GOROOT/bin:$PATH
+  - PATH=$GOROOT/bin:$GOPATH/bin:$PATH
   matrix:
   - TARGET=amd64
   - TARGET=arm
@@ -19,6 +19,9 @@ env:
 matrix:
   fast_finish: true
 
+install:
+  - go get github.com/onsi/ginkgo/ginkgo
+
 script:
  - |
    if [ "${TARGET}" == "amd64" ]; then

Godeps/Godeps.json

@@ -6,6 +6,10 @@
 		"./..."
 	],
 	"Deps": [
+		{
+			"ImportPath": "github.com/alexflint/go-filemutex",
+			"Rev": "72bdc8eae2aef913234599b837f5dda445ca9bd9"
+		},
 		{
 			"ImportPath": "github.com/containernetworking/cni/libcni",
 			"Comment": "v0.6.0-rc1",
@@ -59,6 +63,10 @@
 			"ImportPath": "github.com/d2g/dhcp4client",
 			"Rev": "bed07e1bc5b85f69c6f0fd73393aa35ec68ed892"
 		},
+		{
+			"ImportPath": "github.com/d2g/dhcp4server",
+			"Rev": "1b74244053681c90de5cf1af3d6b5c93b74e3abb"
+		},
 		{
 			"ImportPath": "github.com/j-keck/arping",
 			"Rev": "2cf9dc699c5640a7e2c81403a44127bf28033600"
@@ -230,6 +238,18 @@
 			"ImportPath": "github.com/vishvananda/netns",
 			"Rev": "54f0e4339ce73702a0607f49922aaa1e749b418d"
 		},
+		{
+			"ImportPath": "golang.org/x/net/bpf",
+			"Rev": "e90d6d0afc4c315a0d87a568ae68577cc15149a0"
+		},
+		{
+			"ImportPath": "golang.org/x/net/internal/iana",
+			"Rev": "e90d6d0afc4c315a0d87a568ae68577cc15149a0"
+		},
+		{
+			"ImportPath": "golang.org/x/net/ipv4",
+			"Rev": "e90d6d0afc4c315a0d87a568ae68577cc15149a0"
+		},
 		{
 			"ImportPath": "golang.org/x/sys/unix",
 			"Rev": "076b546753157f758b316e59bcb51e6807c04057"

README.md

@@ -1,4 +1,5 @@
-[![Build Status](https://travis-ci.org/containernetworking/plugins.svg?branch=master)](https://travis-ci.org/containernetworking/plugins)
+[![Linux Build Status](https://travis-ci.org/containernetworking/plugins.svg?branch=master)](https://travis-ci.org/containernetworking/plugins)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/kcuubx0chr76ev86/branch/master?svg=true)](https://ci.appveyor.com/project/cni-bot/plugins/branch/master)
 
 # plugins
 Some CNI network plugins, maintained by the containernetworking team. For more information, see the individual READMEs.

Vagrantfile

@@ -12,7 +12,7 @@ Vagrant.configure(2) do |config|
     apt-get update -y || (sleep 40 && apt-get update -y)
     apt-get install -y git
 
-    wget -qO- https://storage.googleapis.com/golang/go1.8.3.linux-amd64.tar.gz | tar -C /usr/local -xz
+    wget -qO- https://storage.googleapis.com/golang/go1.9.1.linux-amd64.tar.gz | tar -C /usr/local -xz
 
     echo 'export GOPATH=/go' >> /root/.bashrc
     echo 'export PATH=$PATH:/usr/local/go/bin:$GOPATH/bin' >> /root/.bashrc

pkg/ip/ipforward_linux.go

@@ -15,6 +15,7 @@
 package ip
 
 import (
+	"bytes"
 	"io/ioutil"
 
 	"github.com/containernetworking/cni/pkg/types/current"
@@ -51,5 +52,10 @@ func EnableForward(ips []*current.IPConfig) error {
 }
 
 func echo1(f string) error {
+	if content, err := ioutil.ReadFile(f); err == nil {
+		if bytes.Equal(bytes.TrimSpace(content), []byte("1")) {
+			return nil
+		}
+	}
 	return ioutil.WriteFile(f, []byte("1"), 0644)
 }

pkg/ip/ipforward_linux_test.go

@@ -0,0 +1,31 @@
+package ip
+
+import (
+	"io/ioutil"
+	"os"
+	"time"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("IpforwardLinux", func() {
+	It("echo1 must not write the file if content is 1", func() {
+		file, err := ioutil.TempFile(os.TempDir(), "containernetworking")
+		defer os.Remove(file.Name())
+		err = echo1(file.Name())
+		Expect(err).NotTo(HaveOccurred())
+		statBefore, err := file.Stat()
+		Expect(err).NotTo(HaveOccurred())
+
+		// take a duration here, otherwise next file modification operation time
+		// will be same as previous one.
+		time.Sleep(100 * time.Millisecond)
+
+		err = echo1(file.Name())
+		Expect(err).NotTo(HaveOccurred())
+		statAfter, err := file.Stat()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(statBefore.ModTime()).To(Equal(statAfter.ModTime()))
+	})
+})

pkg/ip/ipmasq_linux.go

@@ -75,7 +75,16 @@ func SetupIPMasq(ipn *net.IPNet, chain string, comment string) error {
 
 // TeardownIPMasq undoes the effects of SetupIPMasq
 func TeardownIPMasq(ipn *net.IPNet, chain string, comment string) error {
-	ipt, err := iptables.New()
+	isV6 := ipn.IP.To4() == nil
+
+	var ipt *iptables.IPTables
+	var err error
+
+	if isV6 {
+		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv6)
+	} else {
+		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv4)
+	}
 	if err != nil {
 		return fmt.Errorf("failed to locate iptables: %v", err)
 	}

pkg/ip/link_linux.go

@@ -42,8 +42,14 @@ func makeVethPair(name, peer string, mtu int) (netlink.Link, error) {
 	if err := netlink.LinkAdd(veth); err != nil {
 		return nil, err
 	}
+	// Re-fetch the link to get its creation-time parameters, e.g. index and mac
+	veth2, err := netlink.LinkByName(name)
+	if err != nil {
+		netlink.LinkDel(veth) // try and clean up the link if possible.
+		return nil, err
+	}
 
-	return veth, nil
+	return veth2, nil
 }
 
 func peerExists(name string) bool {
@@ -158,6 +164,9 @@ func SetupVeth(contVethName string, mtu int, hostNS ns.NetNS) (net.Interface, ne
 func DelLinkByName(ifName string) error {
 	iface, err := netlink.LinkByName(ifName)
 	if err != nil {
+		if err.Error() == "Link not found" {
+			return ErrLinkNotFound
+		}
 		return fmt.Errorf("failed to lookup %q: %v", ifName, err)
 	}
 
@@ -168,9 +177,8 @@ func DelLinkByName(ifName string) error {
 	return nil
 }
 
-// DelLinkByNameAddr remove an interface returns its IP address
-// of the specified family
-func DelLinkByNameAddr(ifName string, family int) (*net.IPNet, error) {
+// DelLinkByNameAddr remove an interface and returns its addresses
+func DelLinkByNameAddr(ifName string) ([]*net.IPNet, error) {
 	iface, err := netlink.LinkByName(ifName)
 	if err != nil {
 		if err != nil && err.Error() == "Link not found" {
@@ -179,8 +187,8 @@ func DelLinkByNameAddr(ifName string, family int) (*net.IPNet, error) {
 		return nil, fmt.Errorf("failed to lookup %q: %v", ifName, err)
 	}
 
-	addrs, err := netlink.AddrList(iface, family)
-	if err != nil || len(addrs) == 0 {
+	addrs, err := netlink.AddrList(iface, netlink.FAMILY_ALL)
+	if err != nil {
 		return nil, fmt.Errorf("failed to get IP addresses for %q: %v", ifName, err)
 	}
 
@@ -188,7 +196,14 @@ func DelLinkByNameAddr(ifName string, family int) (*net.IPNet, error) {
 		return nil, fmt.Errorf("failed to delete %q: %v", ifName, err)
 	}
 
-	return addrs[0].IPNet, nil
+	out := []*net.IPNet{}
+	for _, addr := range addrs {
+		if addr.IP.IsGlobalUnicast() {
+			out = append(out, addr.IPNet)
+		}
+	}
+
+	return out, nil
 }
 
 func SetHWAddrByIP(ifName string, ip4 net.IP, ip6 net.IP) error {

pkg/ip/link_linux_test.go

@@ -27,7 +27,6 @@ import (
 	"github.com/containernetworking/plugins/pkg/ns"
 
 	"github.com/vishvananda/netlink"
-	"github.com/vishvananda/netlink/nl"
 )
 
 func getHwAddr(linkname string) string {
@@ -133,7 +132,7 @@ var _ = Describe("Link", func() {
 				defer GinkgoRecover()
 
 				// This string should match the expected error codes in the cmdDel functions of some of the plugins
-				_, err := ip.DelLinkByNameAddr("THIS_DONT_EXIST", netlink.FAMILY_V4)
+				_, err := ip.DelLinkByNameAddr("THIS_DONT_EXIST")
 				Expect(err).To(Equal(ip.ErrLinkNotFound))
 
 				return nil
@@ -220,16 +219,14 @@ var _ = Describe("Link", func() {
 		})
 	})
 
-	It("DelLinkByNameAddr must throw an error for configured interfaces", func() {
+	It("DelLinkByNameAddr should return no IPs when no IPs are configured", func() {
 		_ = containerNetNS.Do(func(ns.NetNS) error {
 			defer GinkgoRecover()
 
 			// this will delete the host endpoint too
-			addr, err := ip.DelLinkByNameAddr(containerVethName, nl.FAMILY_V4)
-			Expect(err).To(HaveOccurred())
-
-			var ipNetNil *net.IPNet
-			Expect(addr).To(Equal(ipNetNil))
+			addr, err := ip.DelLinkByNameAddr(containerVethName)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(addr).To(HaveLen(0))
 			return nil
 		})
 	})

pkg/ip/route_linux.go

@@ -39,3 +39,9 @@ func AddHostRoute(ipn *net.IPNet, gw net.IP, dev netlink.Link) error {
 		Gw:        gw,
 	})
 }
+
+// AddDefaultRoute sets the default route on the given gateway.
+func AddDefaultRoute(gw net.IP, dev netlink.Link) error {
+	_, defNet, _ := net.ParseCIDR("0.0.0.0/0")
+	return AddRoute(defNet, gw, dev)
+}

pkg/ipam/ipam.go

@@ -15,16 +15,8 @@
 package ipam
 
 import (
-	"fmt"
-	"net"
-	"os"
-
 	"github.com/containernetworking/cni/pkg/invoke"
 	"github.com/containernetworking/cni/pkg/types"
-	"github.com/containernetworking/cni/pkg/types/current"
-	"github.com/containernetworking/plugins/pkg/ip"
-
-	"github.com/vishvananda/netlink"
 )
 
 func ExecAdd(plugin string, netconf []byte) (types.Result, error) {
@@ -34,66 +26,3 @@ func ExecAdd(plugin string, netconf []byte) (types.Result, error) {
 func ExecDel(plugin string, netconf []byte) error {
 	return invoke.DelegateDel(plugin, netconf)
 }
-
-// ConfigureIface takes the result of IPAM plugin and
-// applies to the ifName interface
-func ConfigureIface(ifName string, res *current.Result) error {
-	if len(res.Interfaces) == 0 {
-		return fmt.Errorf("no interfaces to configure")
-	}
-
-	link, err := netlink.LinkByName(ifName)
-	if err != nil {
-		return fmt.Errorf("failed to lookup %q: %v", ifName, err)
-	}
-
-	if err := netlink.LinkSetUp(link); err != nil {
-		return fmt.Errorf("failed to set %q UP: %v", ifName, err)
-	}
-
-	var v4gw, v6gw net.IP
-	for _, ipc := range res.IPs {
-		if ipc.Interface == nil {
-			continue
-		}
-		intIdx := *ipc.Interface
-		if intIdx < 0 || intIdx >= len(res.Interfaces) || res.Interfaces[intIdx].Name != ifName {
-			// IP address is for a different interface
-			return fmt.Errorf("failed to add IP addr %v to %q: invalid interface index", ipc, ifName)
-		}
-
-		addr := &netlink.Addr{IPNet: &ipc.Address, Label: ""}
-		if err = netlink.AddrAdd(link, addr); err != nil {
-			return fmt.Errorf("failed to add IP addr %v to %q: %v", ipc, ifName, err)
-		}
-
-		gwIsV4 := ipc.Gateway.To4() != nil
-		if gwIsV4 && v4gw == nil {
-			v4gw = ipc.Gateway
-		} else if !gwIsV4 && v6gw == nil {
-			v6gw = ipc.Gateway
-		}
-	}
-
-	ip.SettleAddresses(ifName, 10)
-
-	for _, r := range res.Routes {
-		routeIsV4 := r.Dst.IP.To4() != nil
-		gw := r.GW
-		if gw == nil {
-			if routeIsV4 && v4gw != nil {
-				gw = v4gw
-			} else if !routeIsV4 && v6gw != nil {
-				gw = v6gw
-			}
-		}
-		if err = ip.AddRoute(&r.Dst, gw, link); err != nil {
-			// we skip over duplicate routes as we assume the first one wins
-			if !os.IsExist(err) {
-				return fmt.Errorf("failed to add route '%v via %v dev %v': %v", r.Dst, gw, ifName, err)
-			}
-		}
-	}
-
-	return nil
-}

pkg/ipam/ipam_linux.go

@@ -0,0 +1,121 @@
+// Copyright 2015 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ipam
+
+import (
+	"fmt"
+	"net"
+	"os"
+
+	"github.com/containernetworking/cni/pkg/types/current"
+	"github.com/containernetworking/plugins/pkg/ip"
+	"github.com/containernetworking/plugins/pkg/utils/sysctl"
+
+	"github.com/vishvananda/netlink"
+)
+
+const (
+	DisableIPv6SysctlTemplate = "net.ipv6.conf.%s.disable_ipv6"
+)
+
+// ConfigureIface takes the result of IPAM plugin and
+// applies to the ifName interface
+func ConfigureIface(ifName string, res *current.Result) error {
+	if len(res.Interfaces) == 0 {
+		return fmt.Errorf("no interfaces to configure")
+	}
+
+	link, err := netlink.LinkByName(ifName)
+	if err != nil {
+		return fmt.Errorf("failed to lookup %q: %v", ifName, err)
+	}
+
+	if err := netlink.LinkSetUp(link); err != nil {
+		return fmt.Errorf("failed to set %q UP: %v", ifName, err)
+	}
+
+	var v4gw, v6gw net.IP
+	var has_enabled_ipv6 bool = false
+	for _, ipc := range res.IPs {
+		if ipc.Interface == nil {
+			continue
+		}
+		intIdx := *ipc.Interface
+		if intIdx < 0 || intIdx >= len(res.Interfaces) || res.Interfaces[intIdx].Name != ifName {
+			// IP address is for a different interface
+			return fmt.Errorf("failed to add IP addr %v to %q: invalid interface index", ipc, ifName)
+		}
+
+		// Make sure sysctl "disable_ipv6" is 0 if we are about to add
+		// an IPv6 address to the interface
+		if !has_enabled_ipv6 && ipc.Version == "6" {
+			// Enabled IPv6 for loopback "lo" and the interface
+			// being configured
+			for _, iface := range [2]string{"lo", ifName} {
+				ipv6SysctlValueName := fmt.Sprintf(DisableIPv6SysctlTemplate, iface)
+
+				// Read current sysctl value
+				value, err := sysctl.Sysctl(ipv6SysctlValueName)
+				if err != nil || value == "0" {
+					// FIXME: log warning if unable to read sysctl value
+					continue
+				}
+
+				// Write sysctl to enable IPv6
+				_, err = sysctl.Sysctl(ipv6SysctlValueName, "0")
+				if err != nil {
+					return fmt.Errorf("failed to enable IPv6 for interface %q (%s=%s): %v", iface, ipv6SysctlValueName, value, err)
+				}
+			}
+			has_enabled_ipv6 = true
+		}
+
+		addr := &netlink.Addr{IPNet: &ipc.Address, Label: ""}
+		if err = netlink.AddrAdd(link, addr); err != nil {
+			return fmt.Errorf("failed to add IP addr %v to %q: %v", ipc, ifName, err)
+		}
+
+		gwIsV4 := ipc.Gateway.To4() != nil
+		if gwIsV4 && v4gw == nil {
+			v4gw = ipc.Gateway
+		} else if !gwIsV4 && v6gw == nil {
+			v6gw = ipc.Gateway
+		}
+	}
+
+	if v6gw != nil {
+		ip.SettleAddresses(ifName, 10)
+	}
+
+	for _, r := range res.Routes {
+		routeIsV4 := r.Dst.IP.To4() != nil
+		gw := r.GW
+		if gw == nil {
+			if routeIsV4 && v4gw != nil {
+				gw = v4gw
+			} else if !routeIsV4 && v6gw != nil {
+				gw = v6gw
+			}
+		}
+		if err = ip.AddRoute(&r.Dst, gw, link); err != nil {
+			// we skip over duplicate routes as we assume the first one wins
+			if !os.IsExist(err) {
+				return fmt.Errorf("failed to add route '%v via %v dev %v': %v", r.Dst, gw, ifName, err)
+			}
+		}
+	}
+
+	return nil
+}

pkg/ipam/ipam_linux_test.go

@@ -39,7 +39,7 @@ func ipNetEqual(a, b *net.IPNet) bool {
 	return a.IP.Equal(b.IP)
 }
 
-var _ = Describe("IPAM Operations", func() {
+var _ = Describe("ConfigureIface", func() {
 	var originalNS ns.NetNS
 	var ipv4, ipv6, routev4, routev6 *net.IPNet
 	var ipgw4, ipgw6, routegwv4, routegwv6 net.IP

pkg/ns/ns.go

@@ -1,178 +0,0 @@
-// Copyright 2015 CNI authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package ns
-
-import (
-	"fmt"
-	"os"
-	"runtime"
-	"sync"
-	"syscall"
-)
-
-type NetNS interface {
-	// Executes the passed closure in this object's network namespace,
-	// attempting to restore the original namespace before returning.
-	// However, since each OS thread can have a different network namespace,
-	// and Go's thread scheduling is highly variable, callers cannot
-	// guarantee any specific namespace is set unless operations that
-	// require that namespace are wrapped with Do().  Also, no code called
-	// from Do() should call runtime.UnlockOSThread(), or the risk
-	// of executing code in an incorrect namespace will be greater.  See
-	// https://github.com/golang/go/wiki/LockOSThread for further details.
-	Do(toRun func(NetNS) error) error
-
-	// Sets the current network namespace to this object's network namespace.
-	// Note that since Go's thread scheduling is highly variable, callers
-	// cannot guarantee the requested namespace will be the current namespace
-	// after this function is called; to ensure this wrap operations that
-	// require the namespace with Do() instead.
-	Set() error
-
-	// Returns the filesystem path representing this object's network namespace
-	Path() string
-
-	// Returns a file descriptor representing this object's network namespace
-	Fd() uintptr
-
-	// Cleans up this instance of the network namespace; if this instance
-	// is the last user the namespace will be destroyed
-	Close() error
-}
-
-type netNS struct {
-	file    *os.File
-	mounted bool
-	closed  bool
-}
-
-// netNS implements the NetNS interface
-var _ NetNS = &netNS{}
-
-const (
-	// https://github.com/torvalds/linux/blob/master/include/uapi/linux/magic.h
-	NSFS_MAGIC   = 0x6e736673
-	PROCFS_MAGIC = 0x9fa0
-)
-
-type NSPathNotExistErr struct{ msg string }
-
-func (e NSPathNotExistErr) Error() string { return e.msg }
-
-type NSPathNotNSErr struct{ msg string }
-
-func (e NSPathNotNSErr) Error() string { return e.msg }
-
-func IsNSorErr(nspath string) error {
-	stat := syscall.Statfs_t{}
-	if err := syscall.Statfs(nspath, &stat); err != nil {
-		if os.IsNotExist(err) {
-			err = NSPathNotExistErr{msg: fmt.Sprintf("failed to Statfs %q: %v", nspath, err)}
-		} else {
-			err = fmt.Errorf("failed to Statfs %q: %v", nspath, err)
-		}
-		return err
-	}
-
-	switch stat.Type {
-	case PROCFS_MAGIC, NSFS_MAGIC:
-		return nil
-	default:
-		return NSPathNotNSErr{msg: fmt.Sprintf("unknown FS magic on %q: %x", nspath, stat.Type)}
-	}
-}
-
-// Returns an object representing the namespace referred to by @path
-func GetNS(nspath string) (NetNS, error) {
-	err := IsNSorErr(nspath)
-	if err != nil {
-		return nil, err
-	}
-
-	fd, err := os.Open(nspath)
-	if err != nil {
-		return nil, err
-	}
-
-	return &netNS{file: fd}, nil
-}
-
-func (ns *netNS) Path() string {
-	return ns.file.Name()
-}
-
-func (ns *netNS) Fd() uintptr {
-	return ns.file.Fd()
-}
-
-func (ns *netNS) errorIfClosed() error {
-	if ns.closed {
-		return fmt.Errorf("%q has already been closed", ns.file.Name())
-	}
-	return nil
-}
-
-func (ns *netNS) Do(toRun func(NetNS) error) error {
-	if err := ns.errorIfClosed(); err != nil {
-		return err
-	}
-
-	containedCall := func(hostNS NetNS) error {
-		threadNS, err := GetCurrentNS()
-		if err != nil {
-			return fmt.Errorf("failed to open current netns: %v", err)
-		}
-		defer threadNS.Close()
-
-		// switch to target namespace
-		if err = ns.Set(); err != nil {
-			return fmt.Errorf("error switching to ns %v: %v", ns.file.Name(), err)
-		}
-		defer threadNS.Set() // switch back
-
-		return toRun(hostNS)
-	}
-
-	// save a handle to current network namespace
-	hostNS, err := GetCurrentNS()
-	if err != nil {
-		return fmt.Errorf("Failed to open current namespace: %v", err)
-	}
-	defer hostNS.Close()
-
-	var wg sync.WaitGroup
-	wg.Add(1)
-
-	var innerError error
-	go func() {
-		defer wg.Done()
-		runtime.LockOSThread()
-		innerError = containedCall(hostNS)
-	}()
-	wg.Wait()
-
-	return innerError
-}
-
-// WithNetNSPath executes the passed closure under the given network
-// namespace, restoring the original namespace afterwards.
-func WithNetNSPath(nspath string, toRun func(NetNS) error) error {
-	ns, err := GetNS(nspath)
-	if err != nil {
-		return err
-	}
-	defer ns.Close()
-	return ns.Do(toRun)
-}

pkg/ns/ns_linux.go

@@ -21,6 +21,7 @@ import (
 	"path"
 	"runtime"
 	"sync"
+	"syscall"
 
 	"golang.org/x/sys/unix"
 )
@@ -147,3 +148,158 @@ func (ns *netNS) Set() error {
 
 	return nil
 }
+
+type NetNS interface {
+	// Executes the passed closure in this object's network namespace,
+	// attempting to restore the original namespace before returning.
+	// However, since each OS thread can have a different network namespace,
+	// and Go's thread scheduling is highly variable, callers cannot
+	// guarantee any specific namespace is set unless operations that
+	// require that namespace are wrapped with Do().  Also, no code called
+	// from Do() should call runtime.UnlockOSThread(), or the risk
+	// of executing code in an incorrect namespace will be greater.  See
+	// https://github.com/golang/go/wiki/LockOSThread for further details.
+	Do(toRun func(NetNS) error) error
+
+	// Sets the current network namespace to this object's network namespace.
+	// Note that since Go's thread scheduling is highly variable, callers
+	// cannot guarantee the requested namespace will be the current namespace
+	// after this function is called; to ensure this wrap operations that
+	// require the namespace with Do() instead.
+	Set() error
+
+	// Returns the filesystem path representing this object's network namespace
+	Path() string
+
+	// Returns a file descriptor representing this object's network namespace
+	Fd() uintptr
+
+	// Cleans up this instance of the network namespace; if this instance
+	// is the last user the namespace will be destroyed
+	Close() error
+}
+
+type netNS struct {
+	file    *os.File
+	mounted bool
+	closed  bool
+}
+
+// netNS implements the NetNS interface
+var _ NetNS = &netNS{}
+
+const (
+	// https://github.com/torvalds/linux/blob/master/include/uapi/linux/magic.h
+	NSFS_MAGIC   = 0x6e736673
+	PROCFS_MAGIC = 0x9fa0
+)
+
+type NSPathNotExistErr struct{ msg string }
+
+func (e NSPathNotExistErr) Error() string { return e.msg }
+
+type NSPathNotNSErr struct{ msg string }
+
+func (e NSPathNotNSErr) Error() string { return e.msg }
+
+func IsNSorErr(nspath string) error {
+	stat := syscall.Statfs_t{}
+	if err := syscall.Statfs(nspath, &stat); err != nil {
+		if os.IsNotExist(err) {
+			err = NSPathNotExistErr{msg: fmt.Sprintf("failed to Statfs %q: %v", nspath, err)}
+		} else {
+			err = fmt.Errorf("failed to Statfs %q: %v", nspath, err)
+		}
+		return err
+	}
+
+	switch stat.Type {
+	case PROCFS_MAGIC, NSFS_MAGIC:
+		return nil
+	default:
+		return NSPathNotNSErr{msg: fmt.Sprintf("unknown FS magic on %q: %x", nspath, stat.Type)}
+	}
+}
+
+// Returns an object representing the namespace referred to by @path
+func GetNS(nspath string) (NetNS, error) {
+	err := IsNSorErr(nspath)
+	if err != nil {
+		return nil, err
+	}
+
+	fd, err := os.Open(nspath)
+	if err != nil {
+		return nil, err
+	}
+
+	return &netNS{file: fd}, nil
+}
+
+func (ns *netNS) Path() string {
+	return ns.file.Name()
+}
+
+func (ns *netNS) Fd() uintptr {
+	return ns.file.Fd()
+}
+
+func (ns *netNS) errorIfClosed() error {
+	if ns.closed {
+		return fmt.Errorf("%q has already been closed", ns.file.Name())
+	}
+	return nil
+}
+
+func (ns *netNS) Do(toRun func(NetNS) error) error {
+	if err := ns.errorIfClosed(); err != nil {
+		return err
+	}
+
+	containedCall := func(hostNS NetNS) error {
+		threadNS, err := GetCurrentNS()
+		if err != nil {
+			return fmt.Errorf("failed to open current netns: %v", err)
+		}
+		defer threadNS.Close()
+
+		// switch to target namespace
+		if err = ns.Set(); err != nil {
+			return fmt.Errorf("error switching to ns %v: %v", ns.file.Name(), err)
+		}
+		defer threadNS.Set() // switch back
+
+		return toRun(hostNS)
+	}
+
+	// save a handle to current network namespace
+	hostNS, err := GetCurrentNS()
+	if err != nil {
+		return fmt.Errorf("Failed to open current namespace: %v", err)
+	}
+	defer hostNS.Close()
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+
+	var innerError error
+	go func() {
+		defer wg.Done()
+		runtime.LockOSThread()
+		innerError = containedCall(hostNS)
+	}()
+	wg.Wait()
+
+	return innerError
+}
+
+// WithNetNSPath executes the passed closure under the given network
+// namespace, restoring the original namespace afterwards.
+func WithNetNSPath(nspath string, toRun func(NetNS) error) error {
+	ns, err := GetNS(nspath)
+	if err != nil {
+		return err
+	}
+	defer ns.Close()
+	return ns.Do(toRun)
+}

pkg/testutils/echosvr/echosvr_test.go

@@ -0,0 +1,74 @@
+package main_test
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net"
+	"os/exec"
+	"strings"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/onsi/gomega/gbytes"
+	"github.com/onsi/gomega/gexec"
+)
+
+var binaryPath string
+
+var _ = SynchronizedBeforeSuite(func() []byte {
+	binaryPath, err := gexec.Build("github.com/containernetworking/plugins/pkg/testutils/echosvr")
+	Expect(err).NotTo(HaveOccurred())
+	return []byte(binaryPath)
+}, func(data []byte) {
+	binaryPath = string(data)
+})
+
+var _ = SynchronizedAfterSuite(func() {}, func() {
+	gexec.CleanupBuildArtifacts()
+})
+
+var _ = Describe("Echosvr", func() {
+	var session *gexec.Session
+	BeforeEach(func() {
+		var err error
+		cmd := exec.Command(binaryPath)
+		session, err = gexec.Start(cmd, GinkgoWriter, GinkgoWriter)
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	AfterEach(func() {
+		session.Kill().Wait()
+	})
+
+	It("starts and doesn't terminate immediately", func() {
+		Consistently(session).ShouldNot(gexec.Exit())
+	})
+
+	tryConnect := func() (net.Conn, error) {
+		programOutput := session.Out.Contents()
+		addr := strings.TrimSpace(string(programOutput))
+
+		conn, err := net.Dial("tcp", addr)
+		if err != nil {
+			return nil, err
+		}
+		return conn, err
+	}
+
+	It("prints its listening address to stdout", func() {
+		Eventually(session.Out).Should(gbytes.Say("\n"))
+		conn, err := tryConnect()
+		Expect(err).NotTo(HaveOccurred())
+		conn.Close()
+	})
+
+	It("will echo data back to us", func() {
+		Eventually(session.Out).Should(gbytes.Say("\n"))
+		conn, err := tryConnect()
+		Expect(err).NotTo(HaveOccurred())
+		defer conn.Close()
+
+		fmt.Fprintf(conn, "hello")
+		Expect(ioutil.ReadAll(conn)).To(Equal([]byte("hello")))
+	})
+})

pkg/testutils/echosvr/init_test.go

@@ -0,0 +1,13 @@
+package main_test
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestEchosvr(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Testutils Echosvr Suite")
+}

pkg/testutils/echosvr/main.go

@@ -0,0 +1,38 @@
+// Echosvr is a simple TCP echo server
+//
+// It prints its listen address on stdout
+//    127.0.0.1:xxxxx
+//  A test should wait for this line, parse it
+//  and may then attempt to connect.
+package main
+
+import (
+	"fmt"
+	"net"
+)
+
+func main() {
+	listener, err := net.Listen("tcp", ":")
+	if err != nil {
+		panic(err)
+	}
+	_, port, err := net.SplitHostPort(listener.Addr().String())
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("127.0.0.1:%s\n", port)
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			panic(err)
+		}
+		go handleConnection(conn)
+	}
+}
+
+func handleConnection(conn net.Conn) {
+	buf := make([]byte, 512)
+	nBytesRead, _ := conn.Read(buf)
+	conn.Write(buf[0:nBytesRead])
+	conn.Close()
+}

plugins/ipam/dhcp/README.md

@@ -18,6 +18,7 @@ $ ./dhcp daemon
 
 If given `-pidfile <path>` arguments after 'daemon', the dhcp plugin will write
 its PID to the given file.
+If given `-hostprefix <prefix>` arguments after 'daemon', the dhcp plugin will use this prefix for netns as `<prefix>/<original netns>`. It could be used in case of running dhcp daemon as container.
 
 Alternatively, you can use systemd socket activation protocol.
 Be sure that the .socket file uses /run/cni/dhcp.sock as the socket path.

plugins/ipam/dhcp/daemon.go

@@ -39,8 +39,9 @@ const resendCount = 3
 var errNoMoreTries = errors.New("no more tries")
 
 type DHCP struct {
-	mux    sync.Mutex
-	leases map[string]*DHCPLease
+	mux             sync.Mutex
+	leases          map[string]*DHCPLease
+	hostNetnsPrefix string
 }
 
 func newDHCP() *DHCP {
@@ -58,7 +59,8 @@ func (d *DHCP) Allocate(args *skel.CmdArgs, result *current.Result) error {
 	}
 
 	clientID := args.ContainerID + "/" + conf.Name
-	l, err := AcquireLease(clientID, args.Netns, args.IfName)
+	hostNetns := d.hostNetnsPrefix + args.Netns
+	l, err := AcquireLease(clientID, hostNetns, args.IfName)
 	if err != nil {
 		return err
 	}
@@ -91,10 +93,10 @@ func (d *DHCP) Release(args *skel.CmdArgs, reply *struct{}) error {
 
 	if l := d.getLease(args.ContainerID, conf.Name); l != nil {
 		l.Stop()
-		return nil
+		d.clearLease(args.ContainerID, conf.Name)
 	}
 
-	return fmt.Errorf("lease not found: %v/%v", args.ContainerID, conf.Name)
+	return nil
 }
 
 func (d *DHCP) getLease(contID, netName string) *DHCPLease {
@@ -117,6 +119,14 @@ func (d *DHCP) setLease(contID, netName string, l *DHCPLease) {
 	d.leases[contID+netName] = l
 }
 
+func (d *DHCP) clearLease(contID, netName string) {
+	d.mux.Lock()
+	defer d.mux.Unlock()
+
+	// TODO(eyakubovich): hash it to avoid collisions
+	delete(d.leases, contID+netName)
+}
+
 func getListener() (net.Listener, error) {
 	l, err := activation.Listeners(true)
 	if err != nil {
@@ -141,7 +151,7 @@ func getListener() (net.Listener, error) {
 	}
 }
 
-func runDaemon(pidfilePath string) error {
+func runDaemon(pidfilePath string, hostPrefix string) error {
 	// since other goroutines (on separate threads) will change namespaces,
 	// ensure the RPC server does not get scheduled onto those
 	runtime.LockOSThread()
@@ -162,6 +172,7 @@ func runDaemon(pidfilePath string) error {
 	}
 
 	dhcp := newDHCP()
+	dhcp.hostNetnsPrefix = hostPrefix
 	rpc.Register(dhcp)
 	rpc.HandleHTTP()
 	http.Serve(l, nil)

plugins/ipam/dhcp/dhcp_suite_test.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CNI authors
+// Copyright 2016 CNI authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,16 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package ip
+package main
 
 import (
-	"net"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
 
-	"github.com/vishvananda/netlink"
+	"testing"
 )
 
-// AddDefaultRoute sets the default route on the given gateway.
-func AddDefaultRoute(gw net.IP, dev netlink.Link) error {
-	_, defNet, _ := net.ParseCIDR("0.0.0.0/0")
-	return AddRoute(defNet, gw, dev)
+func TestDHCP(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "DHCP Suite")
 }

plugins/ipam/dhcp/dhcp_test.go

@@ -0,0 +1,319 @@
+// Copyright 2015 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"os/exec"
+	"sync"
+	"time"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types/current"
+	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/containernetworking/plugins/pkg/testutils"
+
+	"github.com/vishvananda/netlink"
+
+	"github.com/d2g/dhcp4"
+	"github.com/d2g/dhcp4server"
+	"github.com/d2g/dhcp4server/leasepool"
+	"github.com/d2g/dhcp4server/leasepool/memorypool"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func dhcpServerStart(netns ns.NetNS, leaseIP, serverIP net.IP, stopCh <-chan bool) (*sync.WaitGroup, error) {
+	// Add the expected IP to the pool
+	lp := memorypool.MemoryPool{}
+	err := lp.AddLease(leasepool.Lease{IP: dhcp4.IPAdd(net.IPv4(192, 168, 1, 5), 0)})
+	if err != nil {
+		return nil, fmt.Errorf("error adding IP to DHCP pool: %v", err)
+	}
+
+	dhcpServer, err := dhcp4server.New(
+		net.IPv4(192, 168, 1, 1),
+		&lp,
+		dhcp4server.SetLocalAddr(net.UDPAddr{IP: net.IPv4(0, 0, 0, 0), Port: 67}),
+		dhcp4server.SetRemoteAddr(net.UDPAddr{IP: net.IPv4bcast, Port: 68}),
+		dhcp4server.LeaseDuration(time.Minute*15),
+	)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create DHCP server: %v", err)
+	}
+
+	stopWg := sync.WaitGroup{}
+	stopWg.Add(2)
+	startWg := sync.WaitGroup{}
+	startWg.Add(2)
+
+	// Run DHCP server in a goroutine so it doesn't block the main thread
+	go func() {
+		defer GinkgoRecover()
+
+		err = netns.Do(func(ns.NetNS) error {
+			startWg.Done()
+			if err := dhcpServer.ListenAndServe(); err != nil {
+				// Log, but don't trap errors; the server will
+				// always report an error when stopped
+				GinkgoT().Logf("DHCP server finished with error: %v", err)
+			}
+			return nil
+		})
+		stopWg.Done()
+		// Trap any errors after the Done, to allow the main test thread
+		// to continue and clean up.  Otherwise the test hangs.
+		Expect(err).NotTo(HaveOccurred())
+	}()
+
+	// Stop DHCP server in another goroutine for the same reason
+	go func() {
+		startWg.Done()
+		<-stopCh
+		dhcpServer.Shutdown()
+		stopWg.Done()
+	}()
+	startWg.Wait()
+
+	return &stopWg, nil
+}
+
+const (
+	hostVethName string = "dhcp0"
+	contVethName string = "eth0"
+	pidfilePath  string = "/var/run/cni/dhcp-client.pid"
+)
+
+var _ = BeforeSuite(func() {
+	os.Remove(socketPath)
+	os.Remove(pidfilePath)
+})
+
+var _ = AfterSuite(func() {
+	os.Remove(socketPath)
+	os.Remove(pidfilePath)
+})
+
+var _ = Describe("DHCP Operations", func() {
+	var originalNS, targetNS ns.NetNS
+	var dhcpServerStopCh chan bool
+	var dhcpServerDone *sync.WaitGroup
+	var clientCmd *exec.Cmd
+
+	BeforeEach(func() {
+		dhcpServerStopCh = make(chan bool)
+
+		// Create a new NetNS so we don't modify the host
+		var err error
+		originalNS, err = ns.NewNS()
+		Expect(err).NotTo(HaveOccurred())
+
+		targetNS, err = ns.NewNS()
+		Expect(err).NotTo(HaveOccurred())
+
+		serverIP := net.IPNet{
+			IP:   net.IPv4(192, 168, 1, 1),
+			Mask: net.IPv4Mask(255, 255, 255, 0),
+		}
+
+		// Create a veth pair in the "host" (original) NS
+		err = originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+
+			err = netlink.LinkAdd(&netlink.Veth{
+				LinkAttrs: netlink.LinkAttrs{
+					Name: hostVethName,
+				},
+				PeerName: contVethName,
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			host, err := netlink.LinkByName(hostVethName)
+			Expect(err).NotTo(HaveOccurred())
+			err = netlink.LinkSetUp(host)
+			Expect(err).NotTo(HaveOccurred())
+			err = netlink.AddrAdd(host, &netlink.Addr{IPNet: &serverIP})
+			Expect(err).NotTo(HaveOccurred())
+			err = netlink.RouteAdd(&netlink.Route{
+				LinkIndex: host.Attrs().Index,
+				Scope:     netlink.SCOPE_UNIVERSE,
+				Dst: &net.IPNet{
+					IP:   net.IPv4(0, 0, 0, 0),
+					Mask: net.IPv4Mask(0, 0, 0, 0),
+				},
+			})
+
+			cont, err := netlink.LinkByName(contVethName)
+			Expect(err).NotTo(HaveOccurred())
+			err = netlink.LinkSetNsFd(cont, int(targetNS.Fd()))
+			Expect(err).NotTo(HaveOccurred())
+
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		// Move the container side to the container's NS
+		err = targetNS.Do(func(_ ns.NetNS) error {
+			defer GinkgoRecover()
+
+			link, err := netlink.LinkByName(contVethName)
+			Expect(err).NotTo(HaveOccurred())
+			err = netlink.LinkSetUp(link)
+			Expect(err).NotTo(HaveOccurred())
+			return nil
+		})
+
+		// Start the DHCP server
+		dhcpServerDone, err = dhcpServerStart(originalNS, net.IPv4(192, 168, 1, 5), serverIP.IP, dhcpServerStopCh)
+		Expect(err).NotTo(HaveOccurred())
+
+		// Start the DHCP client daemon
+		os.MkdirAll(pidfilePath, 0755)
+		dhcpPluginPath, err := exec.LookPath("dhcp")
+		Expect(err).NotTo(HaveOccurred())
+		clientCmd = exec.Command(dhcpPluginPath, "daemon")
+		err = clientCmd.Start()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(clientCmd.Process).NotTo(BeNil())
+
+		// Wait up to 15 seconds for the client socket
+		Eventually(func() bool {
+			_, err := os.Stat(socketPath)
+			return err == nil
+		}, time.Second*15, time.Second/4).Should(BeTrue())
+	})
+
+	AfterEach(func() {
+		dhcpServerStopCh <- true
+		dhcpServerDone.Wait()
+		clientCmd.Process.Kill()
+		clientCmd.Wait()
+
+		Expect(originalNS.Close()).To(Succeed())
+		Expect(targetNS.Close()).To(Succeed())
+		os.Remove(socketPath)
+		os.Remove(pidfilePath)
+	})
+
+	It("configures and deconfigures a link with ADD/DEL", func() {
+		conf := `{
+    "cniVersion": "0.3.1",
+    "name": "mynet",
+    "type": "ipvlan",
+    "ipam": {
+        "type": "dhcp"
+    }
+}`
+
+		args := &skel.CmdArgs{
+			ContainerID: "dummy",
+			Netns:       targetNS.Path(),
+			IfName:      contVethName,
+			StdinData:   []byte(conf),
+		}
+
+		var addResult *current.Result
+		err := originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+
+			r, _, err := testutils.CmdAddWithResult(targetNS.Path(), contVethName, []byte(conf), func() error {
+				return cmdAdd(args)
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			addResult, err = current.GetResult(r)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(addResult.IPs)).To(Equal(1))
+			Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		err = originalNS.Do(func(ns.NetNS) error {
+			return testutils.CmdDelWithResult(targetNS.Path(), contVethName, func() error {
+				return cmdDel(args)
+			})
+		})
+		Expect(err).NotTo(HaveOccurred())
+	})
+
+	It("correctly handles multiple DELs for the same container", func() {
+		conf := `{
+    "cniVersion": "0.3.1",
+    "name": "mynet",
+    "type": "ipvlan",
+    "ipam": {
+        "type": "dhcp"
+    }
+}`
+
+		args := &skel.CmdArgs{
+			ContainerID: "dummy",
+			Netns:       targetNS.Path(),
+			IfName:      contVethName,
+			StdinData:   []byte(conf),
+		}
+
+		var addResult *current.Result
+		err := originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+
+			r, _, err := testutils.CmdAddWithResult(targetNS.Path(), contVethName, []byte(conf), func() error {
+				return cmdAdd(args)
+			})
+			Expect(err).NotTo(HaveOccurred())
+
+			addResult, err = current.GetResult(r)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(len(addResult.IPs)).To(Equal(1))
+			Expect(addResult.IPs[0].Address.String()).To(Equal("192.168.1.5/24"))
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		wg := sync.WaitGroup{}
+		wg.Add(3)
+		started := sync.WaitGroup{}
+		started.Add(3)
+		for i := 0; i < 3; i++ {
+			go func() {
+				defer GinkgoRecover()
+
+				// Wait until all goroutines are running
+				started.Done()
+				started.Wait()
+
+				err = originalNS.Do(func(ns.NetNS) error {
+					return testutils.CmdDelWithResult(targetNS.Path(), contVethName, func() error {
+						return cmdDel(args)
+					})
+				})
+				Expect(err).NotTo(HaveOccurred())
+				wg.Done()
+			}()
+		}
+		wg.Wait()
+
+		err = originalNS.Do(func(ns.NetNS) error {
+			return testutils.CmdDelWithResult(targetNS.Path(), contVethName, func() error {
+				return cmdDel(args)
+			})
+		})
+		Expect(err).NotTo(HaveOccurred())
+	})
+})

plugins/ipam/dhcp/lease.go

@@ -20,6 +20,7 @@ import (
 	"math/rand"
 	"net"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/d2g/dhcp4"
@@ -55,6 +56,7 @@ type DHCPLease struct {
 	renewalTime   time.Time
 	rebindingTime time.Time
 	expireTime    time.Time
+	stopping      uint32
 	stop          chan struct{}
 	wg            sync.WaitGroup
 }
@@ -106,7 +108,9 @@ func AcquireLease(clientID, netns, ifName string) (*DHCPLease, error) {
 // Stop terminates the background task that maintains the lease
 // and issues a DHCP Release
 func (l *DHCPLease) Stop() {
-	close(l.stop)
+	if atomic.CompareAndSwapUint32(&l.stopping, 0, 1) {
+		close(l.stop)
+	}
 	l.wg.Wait()
 }
 
@@ -292,8 +296,26 @@ func (l *DHCPLease) Gateway() net.IP {
 }
 
 func (l *DHCPLease) Routes() []*types.Route {
-	routes := parseRoutes(l.opts)
-	return append(routes, parseCIDRRoutes(l.opts)...)
+	routes := []*types.Route{}
+
+	// RFC 3442 states that if Classless Static Routes (option 121)
+	// exist, we ignore Static Routes (option 33) and the Router/Gateway.
+	opt121_routes := parseCIDRRoutes(l.opts)
+	if len(opt121_routes) > 0 {
+		return append(routes, opt121_routes...)
+	}
+
+	// Append Static Routes
+	routes = append(routes, parseRoutes(l.opts)...)
+
+	// The CNI spec says even if there is a gateway specified, we must
+	// add a default route in the routes section.
+	if gw := l.Gateway(); gw != nil {
+		_, defaultRoute, _ := net.ParseCIDR("0.0.0.0/0")
+		routes = append(routes, &types.Route{Dst: *defaultRoute, GW: gw})
+	}
+
+	return routes
 }
 
 // jitter returns a random value within [-span, span) range

plugins/ipam/dhcp/main.go

@@ -33,11 +33,13 @@ const socketPath = "/run/cni/dhcp.sock"
 func main() {
 	if len(os.Args) > 1 && os.Args[1] == "daemon" {
 		var pidfilePath string
+		var hostPrefix string
 		daemonFlags := flag.NewFlagSet("daemon", flag.ExitOnError)
 		daemonFlags.StringVar(&pidfilePath, "pidfile", "", "optional path to write daemon PID to")
+		daemonFlags.StringVar(&hostPrefix, "hostprefix", "", "optional prefix to netns")
 		daemonFlags.Parse(os.Args[2:])
 
-		if err := runDaemon(pidfilePath); err != nil {
+		if err := runDaemon(pidfilePath, hostPrefix); err != nil {
 			log.Printf(err.Error())
 			os.Exit(1)
 		}

plugins/ipam/host-local/README.md

@@ -120,6 +120,10 @@ The following [args conventions](https://github.com/containernetworking/cni/blob
 
 * `ips` (array of strings): A list of custom IPs to attempt to allocate
 
+The following [Capability Args](https://github.com/containernetworking/cni/blob/master/CONVENTIONS.md) are supported:
+
+* `ipRanges`: The exact same as the `ranges` array - a list of address pools
+
 ### Custom IP allocation
 For every requested custom IP, the `host-local` allocator will request that IP
 if it falls within one of the `range` objects. Thus it is possible to specify

plugins/ipam/host-local/backend/allocator/config.go

@@ -23,12 +23,16 @@ import (
 	types020 "github.com/containernetworking/cni/pkg/types/020"
 )
 
-// The top-level network config, just so we can get the IPAM block
+// The top-level network config - IPAM plugins are passed the full configuration
+// of the calling plugin, not just the IPAM section.
 type Net struct {
-	Name       string      `json:"name"`
-	CNIVersion string      `json:"cniVersion"`
-	IPAM       *IPAMConfig `json:"ipam"`
-	Args       *struct {
+	Name          string      `json:"name"`
+	CNIVersion    string      `json:"cniVersion"`
+	IPAM          *IPAMConfig `json:"ipam"`
+	RuntimeConfig struct {    // The capability arg
+		IPRanges []RangeSet `json:"ipRanges,omitempty"`
+	} `json:"runtimeConfig,omitempty"`
+	Args *struct {
 		A *IPAMArgs `json:"cni"`
 	} `json:"args"`
 }
@@ -106,6 +110,11 @@ func LoadIPAMConfig(bytes []byte, envArgs string) (*IPAMConfig, string, error) {
 	}
 	n.IPAM.Range = nil
 
+	// If a range is supplied as a runtime config, prepend it to the Ranges
+	if len(n.RuntimeConfig.IPRanges) > 0 {
+		n.IPAM.Ranges = append(n.RuntimeConfig.IPRanges, n.IPAM.Ranges...)
+	}
+
 	if len(n.IPAM.Ranges) == 0 {
 		return nil, "", fmt.Errorf("no IP ranges specified")
 	}

plugins/ipam/host-local/backend/allocator/config_test.go

@@ -132,12 +132,18 @@ var _ = Describe("IPAM config", func() {
 		}))
 	})
 
-	It("Should parse a mixed config", func() {
+	It("Should parse a mixed config with runtime args", func() {
 		input := `{
 			"cniVersion": "0.3.1",
 			"name": "mynet",
 			"type": "ipvlan",
 			"master": "foo0",
+			"runtimeConfig": {
+				"irrelevant": "a",
+				"ipRanges": [
+					[{ "subnet": "12.1.3.0/24" }]
+				]
+			},
 			"ipam": {
 				"type": "host-local",
 				"subnet": "10.1.2.0/24",
@@ -162,6 +168,17 @@ var _ = Describe("IPAM config", func() {
 			Name: "mynet",
 			Type: "host-local",
 			Ranges: []RangeSet{
+				{ // The RuntimeConfig should always be first
+					{
+						RangeStart: net.IP{12, 1, 3, 1},
+						RangeEnd:   net.IP{12, 1, 3, 254},
+						Gateway:    net.IP{12, 1, 3, 1},
+						Subnet: types.IPNet{
+							IP:   net.IP{12, 1, 3, 0},
+							Mask: net.CIDRMask(24, 32),
+						},
+					},
+				},
 				{
 					{
 						RangeStart: net.IP{10, 1, 2, 9},

plugins/ipam/host-local/backend/disk/backend.go

@@ -22,6 +22,7 @@ import (
 	"strings"
 
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend"
+	"runtime"
 )
 
 const lastIPFilePrefix = "last_reserved_ip."
@@ -31,7 +32,7 @@ var defaultDataDir = "/var/lib/cni/networks"
 // Store is a simple disk-backed store that creates one file per IP
 // address in a given directory. The contents of the file are the container ID.
 type Store struct {
-	FileLock
+	*FileLock
 	dataDir string
 }
 
@@ -51,11 +52,12 @@ func New(network, dataDir string) (*Store, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &Store{*lk, dir}, nil
+	return &Store{lk, dir}, nil
 }
 
 func (s *Store) Reserve(id string, ip net.IP, rangeID string) (bool, error) {
-	fname := filepath.Join(s.dataDir, ip.String())
+	fname := GetEscapedPath(s.dataDir, ip.String())
+
 	f, err := os.OpenFile(fname, os.O_RDWR|os.O_EXCL|os.O_CREATE, 0644)
 	if os.IsExist(err) {
 		return false, nil
@@ -73,7 +75,7 @@ func (s *Store) Reserve(id string, ip net.IP, rangeID string) (bool, error) {
 		return false, err
 	}
 	// store the reserved ip in lastIPFile
-	ipfile := filepath.Join(s.dataDir, lastIPFilePrefix+rangeID)
+	ipfile := GetEscapedPath(s.dataDir, lastIPFilePrefix+rangeID)
 	err = ioutil.WriteFile(ipfile, []byte(ip.String()), 0644)
 	if err != nil {
 		return false, err
@@ -83,7 +85,7 @@ func (s *Store) Reserve(id string, ip net.IP, rangeID string) (bool, error) {
 
 // LastReservedIP returns the last reserved IP if exists
 func (s *Store) LastReservedIP(rangeID string) (net.IP, error) {
-	ipfile := filepath.Join(s.dataDir, lastIPFilePrefix+rangeID)
+	ipfile := GetEscapedPath(s.dataDir, lastIPFilePrefix+rangeID)
 	data, err := ioutil.ReadFile(ipfile)
 	if err != nil {
 		return nil, err
@@ -92,7 +94,7 @@ func (s *Store) LastReservedIP(rangeID string) (net.IP, error) {
 }
 
 func (s *Store) Release(ip net.IP) error {
-	return os.Remove(filepath.Join(s.dataDir, ip.String()))
+	return os.Remove(GetEscapedPath(s.dataDir, ip.String()))
 }
 
 // N.B. This function eats errors to be tolerant and
@@ -115,3 +117,10 @@ func (s *Store) ReleaseByID(id string) error {
 	})
 	return err
 }
+
+func GetEscapedPath(dataDir string, fname string) string {
+	if runtime.GOOS == "windows" {
+		fname = strings.Replace(fname, ":", "_", -1)
+	}
+	return filepath.Join(dataDir, fname)
+}

plugins/ipam/host-local/backend/disk/disk_suite_test.go

@@ -1,4 +1,4 @@
-// Copyright 2015-2017 CNI authors
+// Copyright 2016 CNI authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,23 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !linux
-
-package ip
+package disk
 
 import (
-	"net"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
 
-	"github.com/containernetworking/cni/pkg/types"
-	"github.com/vishvananda/netlink"
+	"testing"
 )
 
-// AddRoute adds a universally-scoped route to a device.
-func AddRoute(ipn *net.IPNet, gw net.IP, dev netlink.Link) error {
-	return types.NotImplementedError
-}
-
-// AddHostRoute adds a host-scoped route to a device.
-func AddHostRoute(ipn *net.IPNet, gw net.IP, dev netlink.Link) error {
-	return types.NotImplementedError
+func TestLock(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Disk Suite")
 }

plugins/ipam/host-local/backend/disk/lock.go

@@ -15,18 +15,28 @@
 package disk
 
 import (
+	"github.com/alexflint/go-filemutex"
 	"os"
-	"syscall"
+	"path"
 )
 
 // FileLock wraps os.File to be used as a lock using flock
 type FileLock struct {
-	f *os.File
+	f *filemutex.FileMutex
 }
 
 // NewFileLock opens file/dir at path and returns unlocked FileLock object
-func NewFileLock(path string) (*FileLock, error) {
-	f, err := os.Open(path)
+func NewFileLock(lockPath string) (*FileLock, error) {
+	fi, err := os.Stat(lockPath)
+	if err != nil {
+		return nil, err
+	}
+
+	if fi.IsDir() {
+		lockPath = path.Join(lockPath, "lock")
+	}
+
+	f, err := filemutex.New(lockPath)
 	if err != nil {
 		return nil, err
 	}
@@ -34,17 +44,16 @@ func NewFileLock(path string) (*FileLock, error) {
 	return &FileLock{f}, nil
 }
 
-// Close closes underlying file
 func (l *FileLock) Close() error {
 	return l.f.Close()
 }
 
 // Lock acquires an exclusive lock
 func (l *FileLock) Lock() error {
-	return syscall.Flock(int(l.f.Fd()), syscall.LOCK_EX)
+	return l.f.Lock()
 }
 
 // Unlock releases the lock
 func (l *FileLock) Unlock() error {
-	return syscall.Flock(int(l.f.Fd()), syscall.LOCK_UN)
+	return l.f.Unlock()
 }

plugins/ipam/host-local/backend/disk/lock_test.go

@@ -0,0 +1,63 @@
+// Copyright 2016 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package disk
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Lock Operations", func() {
+	It("locks a file path", func() {
+		dir, err := ioutil.TempDir("", "")
+		Expect(err).ToNot(HaveOccurred())
+		defer os.RemoveAll(dir)
+
+		// create a dummy file to lock
+		path := filepath.Join(dir, "x")
+		f, err := os.OpenFile(path, os.O_RDONLY|os.O_CREATE, 0666)
+		Expect(err).ToNot(HaveOccurred())
+		err = f.Close()
+		Expect(err).ToNot(HaveOccurred())
+
+		// now use it to lock
+		m, err := NewFileLock(path)
+		Expect(err).ToNot(HaveOccurred())
+
+		err = m.Lock()
+		Expect(err).ToNot(HaveOccurred())
+		err = m.Unlock()
+		Expect(err).ToNot(HaveOccurred())
+	})
+
+	It("locks a folder path", func() {
+		dir, err := ioutil.TempDir("", "")
+		Expect(err).ToNot(HaveOccurred())
+		defer os.RemoveAll(dir)
+
+		// use the folder to lock
+		m, err := NewFileLock(dir)
+		Expect(err).ToNot(HaveOccurred())
+
+		err = m.Lock()
+		Expect(err).ToNot(HaveOccurred())
+		err = m.Unlock()
+		Expect(err).ToNot(HaveOccurred())
+	})
+})

plugins/ipam/host-local/host_local_test.go

@@ -28,6 +28,7 @@ import (
 	"github.com/containernetworking/cni/pkg/types/current"
 	"github.com/containernetworking/plugins/pkg/testutils"
 
+	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/disk"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
@@ -37,7 +38,7 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
@@ -45,26 +46,26 @@ var _ = Describe("host-local Operations", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		conf := fmt.Sprintf(`{
-"cniVersion": "0.3.1",
-"name": "mynet",
-"type": "ipvlan",
-"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"dataDir": "%s",
-		"resolvConf": "%s/resolv.conf",
-		"ranges": [
-			[{ "subnet": "10.1.2.0/24" }, {"subnet": "10.2.2.0/24"}],
-			[{ "subnet": "2001:db8:1::0/64" }]
-		],
-		"routes": [
-			{"dst": "0.0.0.0/0"},
-			{"dst": "::/0"},
-			{"dst": "192.168.0.0/16", "gw": "1.1.1.1"},
-			{"dst": "2001:db8:2::0/64", "gw": "2001:db8:3::1"}
-		]
-	}
-}`, tmpDir, tmpDir)
+		"cniVersion": "0.3.1",
+		"name": "mynet",
+		"type": "ipvlan",
+		"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"dataDir": "%s",
+				"resolvConf": "%s/resolv.conf",
+				"ranges": [
+					[{ "subnet": "10.1.2.0/24" }, {"subnet": "10.2.2.0/24"}],
+					[{ "subnet": "2001:db8:1::0/64" }]
+				],
+				"routes": [
+					{"dst": "0.0.0.0/0"},
+					{"dst": "::/0"},
+					{"dst": "192.168.0.0/16", "gw": "1.1.1.1"},
+					{"dst": "2001:db8:2::0/64", "gw": "2001:db8:3::1"}
+				]
+			}
+		}`, tmpDir, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "dummy",
@@ -112,7 +113,7 @@ var _ = Describe("host-local Operations", func() {
 		Expect(err).NotTo(HaveOccurred())
 		Expect(string(contents)).To(Equal("dummy"))
 
-		ipFilePath2 := filepath.Join(tmpDir, "mynet", "2001:db8:1::2")
+		ipFilePath2 := filepath.Join(tmpDir, disk.GetEscapedPath("mynet", "2001:db8:1::2"))
 		contents, err = ioutil.ReadFile(ipFilePath2)
 		Expect(err).NotTo(HaveOccurred())
 		Expect(string(contents)).To(Equal("dummy"))
@@ -142,21 +143,21 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.3.0",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"subnet": "10.1.2.0/24",
-		"dataDir": "%s"
-	}
-}`, tmpDir)
+			"cniVersion": "0.3.0",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"subnet": "10.1.2.0/24",
+				"dataDir": "%s"
+			}
+		}`, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "dummy",
@@ -176,7 +177,7 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
@@ -184,17 +185,17 @@ var _ = Describe("host-local Operations", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.1.0",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"subnet": "10.1.2.0/24",
-		"dataDir": "%s",
-		"resolvConf": "%s/resolv.conf"
-	}
-}`, tmpDir, tmpDir)
+			"cniVersion": "0.1.0",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"subnet": "10.1.2.0/24",
+				"dataDir": "%s",
+				"resolvConf": "%s/resolv.conf"
+			}
+		}`, tmpDir, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "dummy",
@@ -245,21 +246,21 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.3.1",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"subnet": "10.1.2.0/24",
-		"dataDir": "%s"
-	}
-}`, tmpDir)
+			"cniVersion": "0.3.1",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"subnet": "10.1.2.0/24",
+				"dataDir": "%s"
+			}
+		}`, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "   dummy\n ",
@@ -296,21 +297,21 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.2.0",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"subnet": "10.1.2.0/24",
-		"dataDir": "%s"
-	}
-}`, tmpDir)
+			"cniVersion": "0.2.0",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"subnet": "10.1.2.0/24",
+				"dataDir": "%s"
+			}
+		}`, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "testing",
@@ -331,28 +332,28 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.3.1",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"dataDir": "%s",
-		"ranges": [
-			[{ "subnet": "10.1.2.0/24" }]
-		]
-	},
-	"args": {
-		"cni": {
-			"ips": ["10.1.2.88"]
-		}
-	}
-}`, tmpDir)
+			"cniVersion": "0.3.1",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"dataDir": "%s",
+				"ranges": [
+					[{ "subnet": "10.1.2.0/24" }]
+				]
+			},
+			"args": {
+				"cni": {
+					"ips": ["10.1.2.88"]
+				}
+			}
+		}`, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "dummy",
@@ -376,7 +377,7 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
@@ -384,24 +385,24 @@ var _ = Describe("host-local Operations", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.3.1",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"dataDir": "%s",
-		"ranges": [
-			[{ "subnet": "10.1.2.0/24" }],
-			[{ "subnet": "10.1.3.0/24" }]
-		]
-	},
-	"args": {
-		"cni": {
-			"ips": ["10.1.2.88", "10.1.3.77"]
-		}
-	}
-}`, tmpDir)
+			"cniVersion": "0.3.1",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"dataDir": "%s",
+				"ranges": [
+					[{ "subnet": "10.1.2.0/24" }],
+					[{ "subnet": "10.1.3.0/24" }]
+				]
+			},
+			"args": {
+				"cni": {
+					"ips": ["10.1.2.88", "10.1.3.77"]
+				}
+			}
+		}`, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "dummy",
@@ -426,7 +427,7 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
@@ -434,24 +435,24 @@ var _ = Describe("host-local Operations", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.3.1",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"dataDir": "%s",
-		"ranges": [
-			[{"subnet":"172.16.1.0/24"}, { "subnet": "10.1.2.0/24" }],
-			[{ "subnet": "2001:db8:1::/24" }]
-		]
-	},
-	"args": {
-		"cni": {
-			"ips": ["10.1.2.88", "2001:db8:1::999"]
-		}
-	}
-}`, tmpDir)
+			"cniVersion": "0.3.1",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"dataDir": "%s",
+				"ranges": [
+					[{"subnet":"172.16.1.0/24"}, { "subnet": "10.1.2.0/24" }],
+					[{ "subnet": "2001:db8:1::/24" }]
+				]
+			},
+			"args": {
+				"cni": {
+					"ips": ["10.1.2.88", "2001:db8:1::999"]
+				}
+			}
+		}`, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "dummy",
@@ -476,29 +477,29 @@ var _ = Describe("host-local Operations", func() {
 		const ifname string = "eth0"
 		const nspath string = "/some/where"
 
-		tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+		tmpDir, err := getTmpDir()
 		Expect(err).NotTo(HaveOccurred())
 		defer os.RemoveAll(tmpDir)
 
 		conf := fmt.Sprintf(`{
-	"cniVersion": "0.3.1",
-	"name": "mynet",
-	"type": "ipvlan",
-	"master": "foo0",
-	"ipam": {
-		"type": "host-local",
-		"dataDir": "%s",
-		"ranges": [
-			[{ "subnet": "10.1.2.0/24" }],
-			[{ "subnet": "10.1.3.0/24" }]
-		]
-	},
-	"args": {
-		"cni": {
-			"ips": ["10.1.2.88", "10.1.2.77"]
-		}
-	}
-}`, tmpDir)
+			"cniVersion": "0.3.1",
+			"name": "mynet",
+			"type": "ipvlan",
+			"master": "foo0",
+			"ipam": {
+				"type": "host-local",
+				"dataDir": "%s",
+				"ranges": [
+					[{ "subnet": "10.1.2.0/24" }],
+					[{ "subnet": "10.1.3.0/24" }]
+				]
+			},
+			"args": {
+				"cni": {
+					"ips": ["10.1.2.88", "10.1.2.77"]
+				}
+			}
+		}`, tmpDir)
 
 		args := &skel.CmdArgs{
 			ContainerID: "dummy",
@@ -517,6 +518,15 @@ var _ = Describe("host-local Operations", func() {
 	})
 })
 
+func getTmpDir() (string, error) {
+	tmpDir, err := ioutil.TempDir("", "host_local_artifacts")
+	if err == nil {
+		tmpDir = filepath.ToSlash(tmpDir)
+	}
+
+	return tmpDir, err
+}
+
 func mustCIDR(s string) net.IPNet {
 	ip, n, err := net.ParseCIDR(s)
 	n.IP = ip

plugins/linux_only.txt

@@ -0,0 +1,10 @@
+plugins/ipam/dhcp
+plugins/main/bridge
+plugins/main/host-device
+plugins/main/ipvlan
+plugins/main/loopback
+plugins/main/macvlan
+plugins/main/ptp
+plugins/main/vlan
+plugins/meta/portmap
+plugins/meta/tuning

plugins/main/bridge/bridge.go

@@ -32,6 +32,7 @@ import (
 	"github.com/containernetworking/plugins/pkg/ipam"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/utils"
+	"github.com/j-keck/arping"
 	"github.com/vishvananda/netlink"
 )
 
@@ -172,6 +173,13 @@ func ensureBridgeAddr(br *netlink.Bridge, family int, ipn *net.IPNet, forceAddre
 	if err := netlink.AddrAdd(br, addr); err != nil {
 		return fmt.Errorf("could not add IP address to %q: %v", br.Name, err)
 	}
+
+	// Set the bridge's MAC to itself. Otherwise, the bridge will take the
+	// lowest-numbered mac on the bridge, and will change as ifs churn
+	if err := netlink.LinkSetHardwareAddr(br, br.HardwareAddr); err != nil {
+		return fmt.Errorf("could not set bridge's mac: %v", err)
+	}
+
 	return nil
 }
 
@@ -294,8 +302,15 @@ func setupBridge(n *NetConf) (*netlink.Bridge, *current.Interface, error) {
 }
 
 // disableIPV6DAD disables IPv6 Duplicate Address Detection (DAD)
-// for an interface.
+// for an interface, if the interface does not support enhanced_dad.
+// We do this because interfaces with hairpin mode will see their own DAD packets
 func disableIPV6DAD(ifName string) error {
+	// ehanced_dad sends a nonce with the DAD packets, so that we can safely
+	// ignore ourselves
+	enh, err := ioutil.ReadFile(fmt.Sprintf("/proc/sys/net/ipv6/conf/%s/enhanced_dad", ifName))
+	if err == nil && string(enh) == "1\n" {
+		return nil
+	}
 	f := fmt.Sprintf("/proc/sys/net/ipv6/conf/%s/accept_dad", ifName)
 	return ioutil.WriteFile(f, []byte("0"), 0644)
 }
@@ -363,32 +378,34 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 	// Configure the container hardware address and IP address(es)
 	if err := netns.Do(func(_ ns.NetNS) error {
-		// Disable IPv6 DAD just in case hairpin mode is enabled on the
-		// bridge. Hairpin mode causes echos of neighbor solicitation
-		// packets, which causes DAD failures.
-		// TODO: (short term) Disable DAD conditional on actual hairpin mode
-		// TODO: (long term) Use enhanced DAD when that becomes available in kernels.
-		if err := disableIPV6DAD(args.IfName); err != nil {
+		contVeth, err := net.InterfaceByName(args.IfName)
+		if err != nil {
 			return err
 		}
 
+		// Disable IPv6 DAD just in case hairpin mode is enabled on the
+		// bridge. Hairpin mode causes echos of neighbor solicitation
+		// packets, which causes DAD failures.
+		for _, ipc := range result.IPs {
+			if ipc.Version == "6" && (n.HairpinMode || n.PromiscMode) {
+				if err := disableIPV6DAD(args.IfName); err != nil {
+					return err
+				}
+				break
+			}
+		}
+
+		// Add the IP to the interface
 		if err := ipam.ConfigureIface(args.IfName, result); err != nil {
 			return err
 		}
 
-		if result.IPs[0].Address.IP.To4() != nil {
-			if err := ip.SetHWAddrByIP(args.IfName, result.IPs[0].Address.IP, nil /* TODO IPv6 */); err != nil {
-				return err
+		// Send a gratuitous arp
+		for _, ipc := range result.IPs {
+			if ipc.Version == "4" {
+				_ = arping.GratuitousArpOverIface(ipc.Address.IP, *contVeth)
 			}
 		}
-
-		// Refetch the veth since its MAC address may changed
-		link, err := netlink.LinkByName(args.IfName)
-		if err != nil {
-			return fmt.Errorf("could not lookup %q: %v", args.IfName, err)
-		}
-		containerInterface.Mac = link.Attrs().HardwareAddr.String()
-
 		return nil
 	}); err != nil {
 		return err
@@ -415,12 +432,6 @@ func cmdAdd(args *skel.CmdArgs) error {
 				}
 			}
 		}
-
-		if firstV4Addr != nil {
-			if err := ip.SetHWAddrByIP(n.BrName, firstV4Addr, nil /* TODO IPv6 */); err != nil {
-				return err
-			}
-		}
 	}
 
 	if n.IPMasq {
@@ -463,10 +474,10 @@ func cmdDel(args *skel.CmdArgs) error {
 	// There is a netns so try to clean up. Delete can be called multiple times
 	// so don't return an error if the device is already removed.
 	// If the device isn't there then don't try to clean up IP masq either.
-	var ipn *net.IPNet
+	var ipnets []*net.IPNet
 	err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
 		var err error
-		ipn, err = ip.DelLinkByNameAddr(args.IfName, netlink.FAMILY_ALL)
+		ipnets, err = ip.DelLinkByNameAddr(args.IfName)
 		if err != nil && err == ip.ErrLinkNotFound {
 			return nil
 		}
@@ -477,10 +488,14 @@ func cmdDel(args *skel.CmdArgs) error {
 		return err
 	}
 
-	if ipn != nil && n.IPMasq {
+	if n.IPMasq {
 		chain := utils.FormatChainName(n.Name, args.ContainerID)
 		comment := utils.FormatComment(n.Name, args.ContainerID)
-		err = ip.TeardownIPMasq(ipn, chain, comment)
+		for _, ipn := range ipnets {
+			if err := ip.TeardownIPMasq(ipn, chain, comment); err != nil {
+				return err
+			}
+		}
 	}
 
 	return err

plugins/main/bridge/bridge_test.go

@@ -25,7 +25,6 @@ import (
 	"github.com/containernetworking/cni/pkg/types/current"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-	"github.com/containernetworking/plugins/pkg/utils/hwaddr"
 
 	"github.com/vishvananda/netlink"
 
@@ -258,7 +257,14 @@ func (tester *testerV03x) cmdAddTest(tc testCase) {
 
 		Expect(len(result.Interfaces)).To(Equal(3))
 		Expect(result.Interfaces[0].Name).To(Equal(BRNAME))
+		Expect(result.Interfaces[0].Mac).To(HaveLen(17))
+
+		Expect(result.Interfaces[1].Name).To(HavePrefix("veth"))
+		Expect(result.Interfaces[1].Mac).To(HaveLen(17))
+
 		Expect(result.Interfaces[2].Name).To(Equal(IFNAME))
+		Expect(result.Interfaces[2].Mac).To(HaveLen(17)) //mac is random
+		Expect(result.Interfaces[2].Sandbox).To(Equal(tester.targetNS.Path()))
 
 		// Make sure bridge link exists
 		link, err := netlink.LinkByName(result.Interfaces[0].Name)
@@ -266,6 +272,7 @@ func (tester *testerV03x) cmdAddTest(tc testCase) {
 		Expect(link.Attrs().Name).To(Equal(BRNAME))
 		Expect(link).To(BeAssignableToTypeOf(&netlink.Bridge{}))
 		Expect(link.Attrs().HardwareAddr.String()).To(Equal(result.Interfaces[0].Mac))
+		bridgeMAC := link.Attrs().HardwareAddr.String()
 
 		// Ensure bridge has expected gateway address(es)
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_ALL)
@@ -274,10 +281,6 @@ func (tester *testerV03x) cmdAddTest(tc testCase) {
 		for _, cidr := range tc.expGWCIDRs {
 			ip, subnet, err := net.ParseCIDR(cidr)
 			Expect(err).NotTo(HaveOccurred())
-			if ip.To4() != nil {
-				hwAddr := fmt.Sprintf("%s", link.Attrs().HardwareAddr)
-				Expect(hwAddr).To(HavePrefix(hwaddr.PrivateMACPrefixString))
-			}
 
 			found := false
 			subnetPrefix, subnetBits := subnet.Mask.Size()
@@ -300,6 +303,12 @@ func (tester *testerV03x) cmdAddTest(tc testCase) {
 		Expect(err).NotTo(HaveOccurred())
 		Expect(link).To(BeAssignableToTypeOf(&netlink.Veth{}))
 		tester.vethName = result.Interfaces[1].Name
+
+		// Check that the bridge has a different mac from the veth
+		// If not, it means the bridge has an unstable mac and will change
+		// as ifs are added and removed
+		Expect(link.Attrs().HardwareAddr.String()).NotTo(Equal(bridgeMAC))
+
 		return nil
 	})
 	Expect(err).NotTo(HaveOccurred())
@@ -314,14 +323,11 @@ func (tester *testerV03x) cmdAddTest(tc testCase) {
 		Expect(link).To(BeAssignableToTypeOf(&netlink.Veth{}))
 
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
-		if expCIDRsV4 != nil {
-			hwAddr := fmt.Sprintf("%s", link.Attrs().HardwareAddr)
-			Expect(hwAddr).To(HavePrefix(hwaddr.PrivateMACPrefixString))
-		}
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
 		addrs, err = netlink.AddrList(link, netlink.FAMILY_V6)
+		Expect(len(addrs)).To(Equal(len(expCIDRsV6) + 1)) //add one for the link-local
 		Expect(err).NotTo(HaveOccurred())
 		// Ignore link local address which may or may not be
 		// ready when we read addresses.
@@ -442,10 +448,6 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase) {
 		for _, cidr := range tc.expGWCIDRs {
 			ip, subnet, err := net.ParseCIDR(cidr)
 			Expect(err).NotTo(HaveOccurred())
-			if ip.To4() != nil {
-				hwAddr := fmt.Sprintf("%s", link.Attrs().HardwareAddr)
-				Expect(hwAddr).To(HavePrefix(hwaddr.PrivateMACPrefixString))
-			}
 
 			found := false
 			subnetPrefix, subnetBits := subnet.Mask.Size()
@@ -479,10 +481,6 @@ func (tester *testerV01xOr02x) cmdAddTest(tc testCase) {
 		Expect(link).To(BeAssignableToTypeOf(&netlink.Veth{}))
 
 		expCIDRsV4, expCIDRsV6 := tc.expectedCIDRs()
-		if expCIDRsV4 != nil {
-			hwAddr := fmt.Sprintf("%s", link.Attrs().HardwareAddr)
-			Expect(hwAddr).To(HavePrefix(hwaddr.PrivateMACPrefixString))
-		}
 		addrs, err := netlink.AddrList(link, netlink.FAMILY_V4)
 		Expect(err).NotTo(HaveOccurred())
 		Expect(len(addrs)).To(Equal(len(expCIDRsV4)))
@@ -892,4 +890,28 @@ var _ = Describe("bridge Operations", func() {
 		})
 		Expect(err).NotTo(HaveOccurred())
 	})
+	It("creates a bridge with a stable MAC addresses", func() {
+		testCases := []testCase{
+			{
+				subnet: "10.1.2.0/24",
+			},
+			{
+				subnet: "2001:db8:42::/64",
+			},
+		}
+
+		for _, tc := range testCases {
+			tc.cniVersion = "0.3.1"
+			_, _, err := setupBridge(tc.netConf())
+			link, err := netlink.LinkByName(BRNAME)
+			Expect(err).NotTo(HaveOccurred())
+			origMac := link.Attrs().HardwareAddr
+
+			cmdAddDelTest(originalNS, tc)
+
+			link, err = netlink.LinkByName(BRNAME)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(link.Attrs().HardwareAddr).To(Equal(origMac))
+		}
+	})
 })

plugins/main/host-device/README.md

@@ -0,0 +1,21 @@
+# host-device
+Move an already-existing device in to a container.
+
+This simple plugin will move the requested device from the host's network namespace
+to the container's. Nothing else will be done - no IPAM, no addresses.
+
+The device can be specified with any one of three properties:
+* `device`: The device name, e.g. `eth0`, `can0`
+* `hwaddr`: A MAC address
+* `kernelpath`: The kernel device kobj, e.g. `/sys/devices/pci0000:00/0000:00:1f.6`
+
+For this plugin, `CNI_IFNAME` will be ignored. Upon DEL, the device will be moved back.
+
+A sample configuration might look like:
+
+```json
+{
+	"cniVersion": "0.3.1",
+	"device": "enp0s1"
+}
+```

plugins/main/host-device/host-device.go

@@ -0,0 +1,216 @@
+// Copyright 2015 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
+	"github.com/containernetworking/cni/pkg/types/current"
+	"github.com/containernetworking/cni/pkg/version"
+	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/vishvananda/netlink"
+)
+
+type NetConf struct {
+	types.NetConf
+	Device     string `json:"device"`     // Device-Name, something like eth0 or can0 etc.
+	HWAddr     string `json:"hwaddr"`     // MAC Address of target network interface
+	KernelPath string `json:"kernelpath"` // Kernelpath of the device
+}
+
+func init() {
+	// this ensures that main runs only on main thread (thread group leader).
+	// since namespace ops (unshare, setns) are done for a single thread, we
+	// must ensure that the goroutine does not jump from OS thread to thread
+	runtime.LockOSThread()
+}
+
+func loadConf(bytes []byte) (*NetConf, error) {
+	n := &NetConf{}
+	if err := json.Unmarshal(bytes, n); err != nil {
+		return nil, fmt.Errorf("failed to load netconf: %v", err)
+	}
+	if n.Device == "" && n.HWAddr == "" && n.KernelPath == "" {
+		return nil, fmt.Errorf(`specify either "device", "hwaddr" or "kernelpath"`)
+	}
+	return n, nil
+}
+
+func cmdAdd(args *skel.CmdArgs) error {
+	cfg, err := loadConf(args.StdinData)
+	if err != nil {
+		return err
+	}
+	containerNs, err := ns.GetNS(args.Netns)
+	if err != nil {
+		return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
+	}
+	defer containerNs.Close()
+
+	hostDev, err := getLink(cfg.Device, cfg.HWAddr, cfg.KernelPath)
+	if err != nil {
+		return fmt.Errorf("failed to find host device: %v", err)
+	}
+
+	contDev, err := moveLinkIn(hostDev, containerNs, args.IfName)
+	if err != nil {
+		return fmt.Errorf("failed to move link %v", err)
+	}
+	return printLink(contDev, cfg.CNIVersion, containerNs)
+}
+
+func cmdDel(args *skel.CmdArgs) error {
+	_, err := loadConf(args.StdinData)
+	if err != nil {
+		return err
+	}
+	containerNs, err := ns.GetNS(args.Netns)
+	if err != nil {
+		return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
+	}
+	defer containerNs.Close()
+
+	if err := moveLinkOut(containerNs, args.IfName); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func moveLinkIn(hostDev netlink.Link, containerNs ns.NetNS, ifName string) (netlink.Link, error) {
+	if err := netlink.LinkSetNsFd(hostDev, int(containerNs.Fd())); err != nil {
+		return nil, err
+	}
+
+	var contDev netlink.Link
+	if err := containerNs.Do(func(_ ns.NetNS) error {
+		var err error
+		contDev, err = netlink.LinkByName(hostDev.Attrs().Name)
+		if err != nil {
+			return fmt.Errorf("failed to find %q: %v", hostDev.Attrs().Name, err)
+		}
+		// Save host device name into the container device's alias property
+		if err := netlink.LinkSetAlias(contDev, hostDev.Attrs().Name); err != nil {
+			return fmt.Errorf("failed to set alias to %q: %v", hostDev.Attrs().Name, err)
+		}
+		// Rename container device to respect args.IfName
+		if err := netlink.LinkSetName(contDev, ifName); err != nil {
+			return fmt.Errorf("failed to rename device %q to %q: %v", hostDev.Attrs().Name, ifName, err)
+		}
+		// Retrieve link again to get up-to-date name and attributes
+		contDev, err = netlink.LinkByName(ifName)
+		if err != nil {
+			return fmt.Errorf("failed to find %q: %v", ifName, err)
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	return contDev, nil
+}
+
+func moveLinkOut(containerNs ns.NetNS, ifName string) error {
+	defaultNs, err := ns.GetCurrentNS()
+	if err != nil {
+		return err
+	}
+	defer defaultNs.Close()
+
+	return containerNs.Do(func(_ ns.NetNS) error {
+		dev, err := netlink.LinkByName(ifName)
+		if err != nil {
+			return fmt.Errorf("failed to find %q: %v", ifName, err)
+		}
+		// Rename device to it's original name
+		if err := netlink.LinkSetName(dev, dev.Attrs().Alias); err != nil {
+			return fmt.Errorf("failed to restore %q to original name %q: %v", ifName, dev.Attrs().Alias, err)
+		}
+		if err := netlink.LinkSetNsFd(dev, int(defaultNs.Fd())); err != nil {
+			return fmt.Errorf("failed to move %q to host netns: %v", dev.Attrs().Alias, err)
+		}
+		return nil
+	})
+}
+
+func printLink(dev netlink.Link, cniVersion string, containerNs ns.NetNS) error {
+	result := current.Result{
+		CNIVersion: current.ImplementedSpecVersion,
+		Interfaces: []*current.Interface{
+			{
+				Name:    dev.Attrs().Name,
+				Mac:     dev.Attrs().HardwareAddr.String(),
+				Sandbox: containerNs.Path(),
+			},
+		},
+	}
+	return types.PrintResult(&result, cniVersion)
+}
+
+func getLink(devname, hwaddr, kernelpath string) (netlink.Link, error) {
+	links, err := netlink.LinkList()
+	if err != nil {
+		return nil, fmt.Errorf("failed to list node links: %v", err)
+	}
+
+	if len(devname) > 0 {
+		return netlink.LinkByName(devname)
+	} else if len(hwaddr) > 0 {
+		hwAddr, err := net.ParseMAC(hwaddr)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse MAC address %q: %v", hwaddr, err)
+		}
+
+		for _, link := range links {
+			if bytes.Equal(link.Attrs().HardwareAddr, hwAddr) {
+				return link, nil
+			}
+		}
+	} else if len(kernelpath) > 0 {
+		if !filepath.IsAbs(kernelpath) || !strings.HasPrefix(kernelpath, "/sys/devices/") {
+			return nil, fmt.Errorf("kernel device path %q must be absolute and begin with /sys/devices/", kernelpath)
+		}
+		netDir := filepath.Join(kernelpath, "net")
+		files, err := ioutil.ReadDir(netDir)
+		if err != nil {
+			return nil, fmt.Errorf("failed to find network devices at %q", netDir)
+		}
+
+		// Grab the first device from eg /sys/devices/pci0000:00/0000:00:19.0/net
+		for _, file := range files {
+			// Make sure it's really an interface
+			for _, l := range links {
+				if file.Name() == l.Attrs().Name {
+					return l, nil
+				}
+			}
+		}
+	}
+
+	return nil, fmt.Errorf("failed to find physical interface")
+}
+
+func main() {
+	skel.PluginMain(cmdAdd, cmdDel, version.All)
+}

plugins/main/host-device/host-device_suite_test.go

@@ -1,4 +1,4 @@
-// Copyright 2015-2017 CNI authors
+// Copyright 2016 CNI authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,25 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// +build !linux
+package main
 
-package ns
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
 
-import "github.com/containernetworking/cni/pkg/types"
+	"testing"
+)
 
-// Returns an object representing the current OS thread's network namespace
-func GetCurrentNS() (NetNS, error) {
-	return nil, types.NotImplementedError
-}
-
-func NewNS() (NetNS, error) {
-	return nil, types.NotImplementedError
-}
-
-func (ns *netNS) Close() error {
-	return types.NotImplementedError
-}
-
-func (ns *netNS) Set() error {
-	return types.NotImplementedError
+func TestVlan(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "host-device Suite")
 }

plugins/main/host-device/host-device_test.go

@@ -0,0 +1,155 @@
+// Copyright 2017 CNI authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"math/rand"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
+	"github.com/containernetworking/cni/pkg/types/current"
+	"github.com/containernetworking/plugins/pkg/ns"
+	"github.com/containernetworking/plugins/pkg/testutils"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	"github.com/vishvananda/netlink"
+)
+
+var _ = Describe("base functionality", func() {
+	var originalNS ns.NetNS
+	var ifname string
+
+	BeforeEach(func() {
+		var err error
+		originalNS, err = ns.NewNS()
+		Expect(err).NotTo(HaveOccurred())
+
+		ifname = fmt.Sprintf("dummy-%x", rand.Int31())
+	})
+
+	AfterEach(func() {
+		originalNS.Close()
+	})
+
+	It("Works with a valid config", func() {
+		var origLink netlink.Link
+
+		// prepare ifname in original namespace
+		err := originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+			err := netlink.LinkAdd(&netlink.Dummy{
+				LinkAttrs: netlink.LinkAttrs{
+					Name: ifname,
+				},
+			})
+			Expect(err).NotTo(HaveOccurred())
+			origLink, err = netlink.LinkByName(ifname)
+			Expect(err).NotTo(HaveOccurred())
+			err = netlink.LinkSetUp(origLink)
+			Expect(err).NotTo(HaveOccurred())
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		// call CmdAdd
+		targetNS, err := ns.NewNS()
+		Expect(err).NotTo(HaveOccurred())
+
+		CNI_IFNAME := "eth0"
+		conf := fmt.Sprintf(`{
+			"cniVersion": "0.3.0",
+			"name": "cni-plugin-host-device-test",
+			"type": "host-device",
+			"device": %q
+		}`, ifname)
+		args := &skel.CmdArgs{
+			ContainerID: "dummy",
+			Netns:       targetNS.Path(),
+			IfName:      CNI_IFNAME,
+			StdinData:   []byte(conf),
+		}
+		var resI types.Result
+		err = originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+			var err error
+			resI, _, err = testutils.CmdAddWithResult(targetNS.Path(), CNI_IFNAME, []byte(conf), func() error { return cmdAdd(args) })
+			return err
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		// check that the result was sane
+		res, err := current.NewResultFromResult(resI)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(res.Interfaces).To(Equal([]*current.Interface{
+			{
+				Name:    CNI_IFNAME,
+				Mac:     origLink.Attrs().HardwareAddr.String(),
+				Sandbox: targetNS.Path(),
+			},
+		}))
+
+		// assert that dummy0 is now in the target namespace
+		err = targetNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+			link, err := netlink.LinkByName(CNI_IFNAME)
+			Expect(err).NotTo(HaveOccurred())
+			Expect(link.Attrs().HardwareAddr).To(Equal(origLink.Attrs().HardwareAddr))
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		// assert that dummy0 is now NOT in the original namespace anymore
+		err = originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+			_, err := netlink.LinkByName(ifname)
+			Expect(err).To(HaveOccurred())
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		// Check that deleting the device moves it back and restores the name
+		err = originalNS.Do(func(ns.NetNS) error {
+			defer GinkgoRecover()
+			err = testutils.CmdDelWithResult(targetNS.Path(), CNI_IFNAME, func() error { return cmdDel(args) })
+			Expect(err).NotTo(HaveOccurred())
+
+			_, err := netlink.LinkByName(ifname)
+			Expect(err).NotTo(HaveOccurred())
+			return nil
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+	})
+
+	It("fails an invalid config", func() {
+		conf := `{
+			"cniVersion": "0.3.0",
+			"name": "cni-plugin-host-device-test",
+			"type": "host-device"
+		}`
+
+		args := &skel.CmdArgs{
+			ContainerID: "dummy",
+			Netns:       originalNS.Path(),
+			IfName:      ifname,
+			StdinData:   []byte(conf),
+		}
+		_, _, err := testutils.CmdAddWithResult(originalNS.Path(), ifname, []byte(conf), func() error { return cmdAdd(args) })
+		Expect(err).To(MatchError(`specify either "device", "hwaddr" or "kernelpath"`))
+
+	})
+
+})

plugins/main/ipvlan/README.md

@@ -27,10 +27,10 @@ Because all ipvlan interfaces share the MAC address with the host interface, DHC
 
 * `name` (string, required): the name of the network.
 * `type` (string, required): "ipvlan".
-* `master` (string, required): name of the host interface to enslave.
-* `mode` (string, optional): one of "l2", "l3". Defaults to "l2".
+* `master` (string, required unless chained): name of the host interface to enslave.
+* `mode` (string, optional): one of "l2", "l3", "l3s". Defaults to "l2".
 * `mtu` (integer, optional): explicitly set MTU to the specified value. Defaults to the value chosen by the kernel.
-* `ipam` (dictionary, required): IPAM configuration to be used for this network.
+* `ipam` (dictionary, required unless chained): IPAM configuration to be used for this network.
 
 ## Notes
 
@@ -38,3 +38,8 @@ Because all ipvlan interfaces share the MAC address with the host interface, DHC
 Therefore the container will not be able to reach the host via `ipvlan` interface.
 Be sure to also have container join a network that provides connectivity to the host (e.g. `ptp`).
 * A single master interface can not be enslaved by both `macvlan` and `ipvlan`.
+* For IP allocation schemes that cannot be interface agnostic, the ipvlan plugin
+can be chained with an earlier plugin that handles this logic. If `master` is
+omitted, then the previous Result must contain a single interface name for the
+ipvlan plugin to enslave. If `ipam` is omitted, then the previous Result is used
+to configure the ipvlan interface.

plugins/main/ipvlan/ipvlan.go

@@ -32,6 +32,12 @@ import (
 
 type NetConf struct {
 	types.NetConf
+
+	// support chaining for master interface and IP decisions
+	// occurring prior to running ipvlan plugin
+	RawPrevResult *map[string]interface{} `json:"prevResult"`
+	PrevResult    *current.Result         `json:"-"`
+
 	Master string `json:"master"`
 	Mode   string `json:"mode"`
 	MTU    int    `json:"mtu"`
@@ -49,8 +55,31 @@ func loadConf(bytes []byte) (*NetConf, string, error) {
 	if err := json.Unmarshal(bytes, n); err != nil {
 		return nil, "", fmt.Errorf("failed to load netconf: %v", err)
 	}
+	// Parse previous result
+	if n.RawPrevResult != nil {
+		resultBytes, err := json.Marshal(n.RawPrevResult)
+		if err != nil {
+			return nil, "", fmt.Errorf("could not serialize prevResult: %v", err)
+		}
+		res, err := version.NewResult(n.CNIVersion, resultBytes)
+		if err != nil {
+			return nil, "", fmt.Errorf("could not parse prevResult: %v", err)
+		}
+		n.RawPrevResult = nil
+		n.PrevResult, err = current.NewResultFromResult(res)
+		if err != nil {
+			return nil, "", fmt.Errorf("could not convert result to current version: %v", err)
+		}
+	}
 	if n.Master == "" {
-		return nil, "", fmt.Errorf(`"master" field is required. It specifies the host interface name to virtualize`)
+		if n.PrevResult == nil {
+			return nil, "", fmt.Errorf(`"master" field is required. It specifies the host interface name to virtualize`)
+		}
+		if len(n.PrevResult.Interfaces) == 1 && n.PrevResult.Interfaces[0].Name != "" {
+			n.Master = n.PrevResult.Interfaces[0].Name
+		} else {
+			return nil, "", fmt.Errorf("chained master failure. PrevResult lacks a single named interface")
+		}
 	}
 	return n, n.CNIVersion, nil
 }
@@ -143,19 +172,26 @@ func cmdAdd(args *skel.CmdArgs) error {
 		return err
 	}
 
-	// run the IPAM plugin and get back the config to apply
-	r, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
-	if err != nil {
-		return err
-	}
-	// Convert whatever the IPAM result was into the current Result type
-	result, err := current.NewResultFromResult(r)
-	if err != nil {
-		return err
-	}
+	var result *current.Result
+	// Configure iface from PrevResult if we have IPs and an IPAM
+	// block has not been configured
+	if n.IPAM.Type == "" && n.PrevResult != nil && len(n.PrevResult.IPs) > 0 {
+		result = n.PrevResult
+	} else {
+		// run the IPAM plugin and get back the config to apply
+		r, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
+		if err != nil {
+			return err
+		}
+		// Convert whatever the IPAM result was into the current Result type
+		result, err = current.NewResultFromResult(r)
+		if err != nil {
+			return err
+		}
 
-	if len(result.IPs) == 0 {
-		return errors.New("IPAM plugin returned missing IP config")
+		if len(result.IPs) == 0 {
+			return errors.New("IPAM plugin returned missing IP config")
+		}
 	}
 	for _, ipc := range result.IPs {
 		// All addresses belong to the ipvlan interface
@@ -182,9 +218,12 @@ func cmdDel(args *skel.CmdArgs) error {
 		return err
 	}
 
-	err = ipam.ExecDel(n.IPAM.Type, args.StdinData)
-	if err != nil {
-		return err
+	// On chained invocation, IPAM block can be empty
+	if n.IPAM.Type != "" {
+		err = ipam.ExecDel(n.IPAM.Type, args.StdinData)
+		if err != nil {
+			return err
+		}
 	}
 
 	if args.Netns == "" {
@@ -194,7 +233,7 @@ func cmdDel(args *skel.CmdArgs) error {
 	// There is a netns so try to clean up. Delete can be called multiple times
 	// so don't return an error if the device is already removed.
 	err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
-		if _, err := ip.DelLinkByNameAddr(args.IfName, netlink.FAMILY_V4); err != nil {
+		if err := ip.DelLinkByName(args.IfName); err != nil {
 			if err != ip.ErrLinkNotFound {
 				return err
 			}

plugins/main/ipvlan/ipvlan_test.go

@@ -33,6 +33,79 @@ import (
 
 const MASTER_NAME = "eth0"
 
+func ipvlanAddDelTest(conf, IFNAME string, originalNS ns.NetNS) {
+	targetNs, err := ns.NewNS()
+	Expect(err).NotTo(HaveOccurred())
+	defer targetNs.Close()
+
+	args := &skel.CmdArgs{
+		ContainerID: "dummy",
+		Netns:       targetNs.Path(),
+		IfName:      IFNAME,
+		StdinData:   []byte(conf),
+	}
+
+	var result *current.Result
+	err = originalNS.Do(func(ns.NetNS) error {
+		defer GinkgoRecover()
+
+		r, _, err := testutils.CmdAddWithResult(targetNs.Path(), IFNAME, []byte(conf), func() error {
+			return cmdAdd(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+
+		result, err = current.GetResult(r)
+		Expect(err).NotTo(HaveOccurred())
+
+		Expect(len(result.Interfaces)).To(Equal(1))
+		Expect(result.Interfaces[0].Name).To(Equal(IFNAME))
+		Expect(len(result.IPs)).To(Equal(1))
+		return nil
+	})
+	Expect(err).NotTo(HaveOccurred())
+
+	// Make sure ipvlan link exists in the target namespace
+	err = targetNs.Do(func(ns.NetNS) error {
+		defer GinkgoRecover()
+
+		link, err := netlink.LinkByName(IFNAME)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(link.Attrs().Name).To(Equal(IFNAME))
+
+		hwaddr, err := net.ParseMAC(result.Interfaces[0].Mac)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(link.Attrs().HardwareAddr).To(Equal(hwaddr))
+
+		addrs, err := netlink.AddrList(link, syscall.AF_INET)
+		Expect(err).NotTo(HaveOccurred())
+		Expect(len(addrs)).To(Equal(1))
+		return nil
+	})
+	Expect(err).NotTo(HaveOccurred())
+
+	err = originalNS.Do(func(ns.NetNS) error {
+		defer GinkgoRecover()
+
+		err = testutils.CmdDelWithResult(targetNs.Path(), IFNAME, func() error {
+			return cmdDel(args)
+		})
+		Expect(err).NotTo(HaveOccurred())
+		return nil
+	})
+	Expect(err).NotTo(HaveOccurred())
+
+	// Make sure ipvlan link has been deleted
+	err = targetNs.Do(func(ns.NetNS) error {
+		defer GinkgoRecover()
+
+		link, err := netlink.LinkByName(IFNAME)
+		Expect(err).To(HaveOccurred())
+		Expect(link).To(BeNil())
+		return nil
+	})
+	Expect(err).NotTo(HaveOccurred())
+}
+
 var _ = Describe("ipvlan Operations", func() {
 	var originalNS ns.NetNS
 
@@ -116,76 +189,35 @@ var _ = Describe("ipvlan Operations", func() {
     }
 }`, MASTER_NAME)
 
-		targetNs, err := ns.NewNS()
-		Expect(err).NotTo(HaveOccurred())
-		defer targetNs.Close()
+		ipvlanAddDelTest(conf, IFNAME, originalNS)
+	})
 
-		args := &skel.CmdArgs{
-			ContainerID: "dummy",
-			Netns:       targetNs.Path(),
-			IfName:      IFNAME,
-			StdinData:   []byte(conf),
-		}
+	It("configures and deconfigures an iplvan link with ADD/DEL when chained", func() {
+		const IFNAME = "ipvl0"
 
-		var result *current.Result
-		err = originalNS.Do(func(ns.NetNS) error {
-			defer GinkgoRecover()
+		conf := fmt.Sprintf(`{
+    "cniVersion": "0.3.1",
+    "name": "mynet",
+    "type": "ipvlan",
+    "prevResult": {
+            "interfaces": [
+                    {
+                            "name": "%s"
+                    }
+            ],
+            "ips": [
+                    {
+                            "version": "4",
+                            "address": "10.1.2.2/24",
+                            "gateway": "10.1.2.1",
+                            "interface": 0
+                    }
+            ],
+            "routes": []
+    }
+}`, MASTER_NAME)
 
-			r, _, err := testutils.CmdAddWithResult(targetNs.Path(), IFNAME, []byte(conf), func() error {
-				return cmdAdd(args)
-			})
-			Expect(err).NotTo(HaveOccurred())
-
-			result, err = current.GetResult(r)
-			Expect(err).NotTo(HaveOccurred())
-
-			Expect(len(result.Interfaces)).To(Equal(1))
-			Expect(result.Interfaces[0].Name).To(Equal(IFNAME))
-			Expect(len(result.IPs)).To(Equal(1))
-			return nil
-		})
-		Expect(err).NotTo(HaveOccurred())
-
-		// Make sure ipvlan link exists in the target namespace
-		err = targetNs.Do(func(ns.NetNS) error {
-			defer GinkgoRecover()
-
-			link, err := netlink.LinkByName(IFNAME)
-			Expect(err).NotTo(HaveOccurred())
-			Expect(link.Attrs().Name).To(Equal(IFNAME))
-
-			hwaddr, err := net.ParseMAC(result.Interfaces[0].Mac)
-			Expect(err).NotTo(HaveOccurred())
-			Expect(link.Attrs().HardwareAddr).To(Equal(hwaddr))
-
-			addrs, err := netlink.AddrList(link, syscall.AF_INET)
-			Expect(err).NotTo(HaveOccurred())
-			Expect(len(addrs)).To(Equal(1))
-			return nil
-		})
-		Expect(err).NotTo(HaveOccurred())
-
-		err = originalNS.Do(func(ns.NetNS) error {
-			defer GinkgoRecover()
-
-			err = testutils.CmdDelWithResult(targetNs.Path(), IFNAME, func() error {
-				return cmdDel(args)
-			})
-			Expect(err).NotTo(HaveOccurred())
-			return nil
-		})
-		Expect(err).NotTo(HaveOccurred())
-
-		// Make sure ipvlan link has been deleted
-		err = targetNs.Do(func(ns.NetNS) error {
-			defer GinkgoRecover()
-
-			link, err := netlink.LinkByName(IFNAME)
-			Expect(err).To(HaveOccurred())
-			Expect(link).To(BeNil())
-			return nil
-		})
-		Expect(err).NotTo(HaveOccurred())
+		ipvlanAddDelTest(conf, IFNAME, originalNS)
 	})
 
 	It("deconfigures an unconfigured ipvlan link with DEL", func() {

plugins/main/macvlan/macvlan.go

@@ -161,11 +161,28 @@ func cmdAdd(args *skel.CmdArgs) error {
 		return err
 	}
 
+	// Delete link if err to avoid link leak in this ns
+	defer func() {
+		if err != nil {
+			netns.Do(func(_ ns.NetNS) error {
+				return ip.DelLinkByName(args.IfName)
+			})
+		}
+	}()
+
 	// run the IPAM plugin and get back the config to apply
 	r, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
 	if err != nil {
 		return err
 	}
+
+	// Invoke ipam del if err to avoid ip leak
+	defer func() {
+		if err != nil {
+			ipam.ExecDel(n.IPAM.Type, args.StdinData)
+		}
+	}()
+
 	// Convert whatever the IPAM result was into the current Result type
 	result, err := current.NewResultFromResult(r)
 	if err != nil {
@@ -226,7 +243,7 @@ func cmdDel(args *skel.CmdArgs) error {
 	// There is a netns so try to clean up. Delete can be called multiple times
 	// so don't return an error if the device is already removed.
 	err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
-		if _, err := ip.DelLinkByNameAddr(args.IfName, netlink.FAMILY_V4); err != nil {
+		if err := ip.DelLinkByName(args.IfName); err != nil {
 			if err != ip.ErrLinkNotFound {
 				return err
 			}

plugins/main/ptp/ptp.go

@@ -259,10 +259,10 @@ func cmdDel(args *skel.CmdArgs) error {
 	// There is a netns so try to clean up. Delete can be called multiple times
 	// so don't return an error if the device is already removed.
 	// If the device isn't there then don't try to clean up IP masq either.
-	var ipn *net.IPNet
+	var ipnets []*net.IPNet
 	err := ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
 		var err error
-		ipn, err = ip.DelLinkByNameAddr(args.IfName, netlink.FAMILY_V4)
+		ipnets, err = ip.DelLinkByNameAddr(args.IfName)
 		if err != nil && err == ip.ErrLinkNotFound {
 			return nil
 		}
@@ -273,10 +273,12 @@ func cmdDel(args *skel.CmdArgs) error {
 		return err
 	}
 
-	if ipn != nil && conf.IPMasq {
+	if len(ipnets) != 0 && conf.IPMasq {
 		chain := utils.FormatChainName(conf.Name, args.ContainerID)
 		comment := utils.FormatComment(conf.Name, args.ContainerID)
-		err = ip.TeardownIPMasq(ipn, chain, comment)
+		for _, ipn := range ipnets {
+			err = ip.TeardownIPMasq(ipn, chain, comment)
+		}
 	}
 
 	return err

plugins/main/ptp/ptp_test.go

@@ -78,12 +78,14 @@ var _ = Describe("ptp Operations", func() {
 		// Make sure ptp link exists in the target namespace
 		// Then, ping the gateway
 		seenIPs := 0
+
+		wantMac := ""
 		err = targetNs.Do(func(ns.NetNS) error {
 			defer GinkgoRecover()
 
 			link, err := netlink.LinkByName(IFNAME)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(link.Attrs().Name).To(Equal(IFNAME))
+			wantMac = link.Attrs().HardwareAddr.String()
 
 			for _, ipc := range res.IPs {
 				if *ipc.Interface != 1 {
@@ -105,6 +107,17 @@ var _ = Describe("ptp Operations", func() {
 
 		Expect(seenIPs).To(Equal(numIPs))
 
+		// make sure the interfaces are correct
+		Expect(res.Interfaces).To(HaveLen(2))
+
+		Expect(res.Interfaces[0].Name).To(HavePrefix("veth"))
+		Expect(res.Interfaces[0].Mac).To(HaveLen(17))
+		Expect(res.Interfaces[0].Sandbox).To(BeEmpty())
+
+		Expect(res.Interfaces[1].Name).To(Equal(IFNAME))
+		Expect(res.Interfaces[1].Mac).To(Equal(wantMac))
+		Expect(res.Interfaces[1].Sandbox).To(Equal(targetNs.Path()))
+
 		// Call the plugins with the DEL command, deleting the veth endpoints
 		err = originalNS.Do(func(ns.NetNS) error {
 			defer GinkgoRecover()

plugins/main/vlan/vlan.go

@@ -181,9 +181,8 @@ func cmdDel(args *skel.CmdArgs) error {
 	}
 
 	err = ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
-		_, err = ip.DelLinkByNameAddr(args.IfName, netlink.FAMILY_V4)
-		// FIXME: use ip.ErrLinkNotFound when cni is revendored
-		if err != nil && err.Error() == "Link not found" {
+		err = ip.DelLinkByName(args.IfName)
+		if err != nil && err != ip.ErrLinkNotFound {
 			return nil
 		}
 		return err

plugins/meta/portmap/README.md

@@ -8,6 +8,8 @@ You should use this plugin as part of a network configuration list. It accepts
 the following configuration options:
 
 * `snat` - boolean, default true. If true or omitted, set up the SNAT chains
+* `markMasqBit` - int, (0-31), default 13. The mark bit to use for masquerading (see section SNAT). Cannot be set when `externalSetMarkChain` is used.
+* `externalSetMarkChain` - string, default nil. If you already have a Masquerade mark chain (e.g. Kubernetes), specify it here. This will use that instead of creating a separate chain. When this is set, `markMasqBit` must be unspecified.
 * `conditionsV4`, `conditionsV6` - array of strings. A list of arbitrary `iptables` 
 matches to add to the per-container rule. This may be useful if you wish to 
 exclude specific IPs from port-mapping
@@ -15,7 +17,7 @@ exclude specific IPs from port-mapping
 The plugin expects to receive the actual list of port mappings via the 
 `portMappings` [capability argument](https://github.com/containernetworking/cni/blob/master/CONVENTIONS.md)
 
-So a sample standalone config list (with the file extension .conflist) might
+A sample standalone config list for Kubernetes (with the file extension .conflist) might
 look like:
 
 ```json
@@ -39,21 +41,31 @@ look like:
                 {
                         "type": "portmap",
                         "capabilities": {"portMappings": true},
-                        "snat": false,
-                        "conditionsV4": ["!", "-d", "192.0.2.0/24"],
-                        "conditionsV6": ["!", "-d", "fc00::/7"]
+                        "externalSetMarkChain": "KUBE-MARK-MASQ"
                 }
         ]
 }
 ```
 
+A configuration file with all options set:
+```json
+{
+        "type": "portmap",
+        "capabilities": {"portMappings": true},
+        "snat": true,
+        "markMasqBit": 13,
+        "externalSetMarkChain": "CNI-HOSTPORT-SETMARK",
+        "conditionsV4": ["!", "-d", "192.0.2.0/24"],
+        "conditionsV6": ["!", "-d", "fc00::/7"]
+}
+```
+
 
 
 ## Rule structure
 The plugin sets up two sequences of chains and rules - one "primary" DNAT
 sequence to rewrite the destination, and one additional SNAT sequence that
-rewrites the source address for packets from localhost. The sequence is somewhat
-complex to minimize the number of rules non-forwarded packets must traverse.
+will masquerade traffic as needed.
 
 
 ### DNAT
@@ -68,50 +80,54 @@ rules look like this:
 - `--dst-type LOCAL -j CNI-HOSTPORT-DNAT`
 
 `CNI-HOSTPORT-DNAT` chain:
-- `${ConditionsV4/6} -j CNI-DN-xxxxxx` (where xxxxxx is a function of the ContainerID and network name)
+- `${ConditionsV4/6} -p tcp --destination-ports 8080,8043 -j CNI-DN-xxxxxx` (where xxxxxx is a function of the ContainerID and network name)
 
-`CNI-DN-xxxxxx` chain: 
-- `-p tcp --dport 8080 -j DNAT --to-destination 172.16.30.2:80`
+`CNI-HOSTPORT-SETMARK` chain:
+- `-j MARK --set-xmark 0x2000/0x2000`
+
+`CNI-DN-xxxxxx` chain:
+- `-p tcp -s 172.16.30.2 --dport 8080 -j CNI-HOSTPORT-SETMARK` (masquerade hairpin traffic)
+- `-p tcp -s 127.0.0.1 --dport 8080 -j CNI-HOSTPORT-SETMARK` (masquerade localhost traffic)
+- `-p tcp --dport 8080 -j DNAT --to-destination 172.16.30.2:80` (rewrite destination)
+- `-p tcp -s 172.16.30.2 --dport 8043 -j CNI-HOSTPORT-SETMARK`
+- `-p tcp -s 127.0.0.1 --dport 8043 -j CNI-HOSTPORT-SETMARK`
 - `-p tcp --dport 8043 -j DNAT --to-destination 172.16.30.2:443`
 
 New connections to the host will have to traverse every rule, so large numbers
 of port forwards may have a performance impact. This won't affect established
 connections, just the first packet.
 
-### SNAT 
-The SNAT rule enables port-forwarding from the localhost IP on the host.
-This rule rewrites (masquerades) the source address for connections from
-localhost. If this rule did not exist, a connection to `localhost:80` would
-still have a source IP of 127.0.0.1 when received by the container, so no 
-packets would respond. Again, it is a sequence of 3 chains. Because SNAT has to
-occur in the `POSTROUTING` chain, the packet has already been through the DNAT
-chain.
+### SNAT (Masquerade)
+Some packets also need to have the source address rewritten:
+* connections from localhost
+* Hairpin traffic back to the container.
+
+In the DNAT chain, a bit is set on the mark for packets that need snat. This
+chain performs that masquerading. By default, bit 13 is set, but this is
+configurable. If you are using other tools that also use the iptables mark,
+you should make sure this doesn't conflict.
+
+Some container runtimes, most notably Kubernetes, already have a set of rules
+for masquerading when a specific mark bit is set. If so enabled, the plugin
+will use that chain instead.
 
 `POSTROUTING`:
-- `-s 127.0.0.1 ! -d 127.0.0.1 -j CNI-HOSTPORT-SNAT`
+- `-j CNI-HOSTPORT-MASQ`
 
-`CNI-HOSTPORT-SNAT`:
-- `-j CNI-SN-xxxxx`
-
-`CNI-SN-xxxxx`:
-- `-p tcp -s 127.0.0.1 -d 172.16.30.2 --dport 80 -j MASQUERADE`
-- `-p tcp -s 127.0.0.1 -d 172.16.30.2 --dport 443 -j MASQUERADE`
-
-Only new connections from the host, where the source address is 127.0.0.1 but
-not the destination will traverse this chain. It is unlikely that any packets
-will reach these rules without being SNATted, so the cost should be minimal.
+`CNI-HOSTPORT-MASQ`:
+- `--mark 0x2000 -j MASQUERADE`
 
 Because MASQUERADE happens in POSTROUTING, it means that packets with source ip
-127.0.0.1 need to pass a routing boundary. By default, that is not allowed
-in Linux. So, need to enable the sysctl `net.ipv4.conf.IFNAME.route_localnet`,
-where IFNAME is the name of the host-side interface that routes traffic to the
-container.
+127.0.0.1 need to first pass a routing boundary before being masqueraded. By
+default, that is not allowed in Linux. So, the plugin needs to enable the sysctl
+`net.ipv4.conf.IFNAME.route_localnet`, where IFNAME is the name of the host-side
+interface that routes traffic to the container.
 
-There is no equivalent to `route_localnet` for ipv6, so SNAT does not work
-for ipv6. If you need port forwarding from localhost, your container must have
-an ipv4 address.
+There is no equivalent to `route_localnet` for ipv6, so connections to ::1
+will not be portmapped for ipv6. If you need port forwarding from localhost,
+your container must have an ipv4 address.
 
 
 ## Known issues
 - ipsets could improve efficiency
-- SNAT does not work with ipv6.
+- forwarding from localhost does not work with ipv6.

plugins/meta/portmap/chain.go

@@ -25,12 +25,14 @@ import (
 type chain struct {
 	table       string
 	name        string
-	entryRule   []string // the rule that enters this chain
 	entryChains []string // the chains to add the entry rule
+
+	entryRules [][]string // the rules that "point" to this chain
+	rules      [][]string // the rules this chain contains
 }
 
 // setup idempotently creates the chain. It will not error if the chain exists.
-func (c *chain) setup(ipt *iptables.IPTables, rules [][]string) error {
+func (c *chain) setup(ipt *iptables.IPTables) error {
 	// create the chain
 	exists, err := chainExists(ipt, c.table, c.name)
 	if err != nil {
@@ -43,17 +45,21 @@ func (c *chain) setup(ipt *iptables.IPTables, rules [][]string) error {
 	}
 
 	// Add the rules to the chain
-	for i := len(rules) - 1; i >= 0; i-- {
-		if err := prependUnique(ipt, c.table, c.name, rules[i]); err != nil {
+	for i := len(c.rules) - 1; i >= 0; i-- {
+		if err := prependUnique(ipt, c.table, c.name, c.rules[i]); err != nil {
 			return err
 		}
 	}
 
-	// Add the entry rules
-	entryRule := append(c.entryRule, "-j", c.name)
+	// Add the entry rules to the entry chains
 	for _, entryChain := range c.entryChains {
-		if err := prependUnique(ipt, c.table, entryChain, entryRule); err != nil {
-			return err
+		for i := len(c.entryRules) - 1; i >= 0; i-- {
+			r := []string{}
+			r = append(r, c.entryRules[i]...)
+			r = append(r, "-j", c.name)
+			if err := prependUnique(ipt, c.table, entryChain, r); err != nil {
+				return err
+			}
 		}
 	}
 

plugins/meta/portmap/chain_test.go

@@ -49,8 +49,12 @@ var _ = Describe("chain tests", func() {
 		testChain = chain{
 			table:       TABLE,
 			name:        chainName,
-			entryRule:   []string{"-d", "203.0.113.1"},
 			entryChains: []string{tlChainName},
+			entryRules:  [][]string{{"-d", "203.0.113.1"}},
+			rules: [][]string{
+				{"-m", "comment", "--comment", "test 1", "-j", "RETURN"},
+				{"-m", "comment", "--comment", "test 2", "-j", "RETURN"},
+			},
 		}
 
 		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv4)
@@ -90,11 +94,7 @@ var _ = Describe("chain tests", func() {
 		Expect(err).NotTo(HaveOccurred())
 
 		// Create the chain
-		chainRules := [][]string{
-			{"-m", "comment", "--comment", "test 1", "-j", "RETURN"},
-			{"-m", "comment", "--comment", "test 2", "-j", "RETURN"},
-		}
-		err = testChain.setup(ipt, chainRules)
+		err = testChain.setup(ipt)
 		Expect(err).NotTo(HaveOccurred())
 
 		// Verify the chain exists
@@ -151,15 +151,11 @@ var _ = Describe("chain tests", func() {
 	It("creates chains idempotently", func() {
 		defer cleanup()
 
-		// Create the chain
-		chainRules := [][]string{
-			{"-m", "comment", "--comment", "test", "-j", "RETURN"},
-		}
-		err := testChain.setup(ipt, chainRules)
+		err := testChain.setup(ipt)
 		Expect(err).NotTo(HaveOccurred())
 
 		// Create it again!
-		err = testChain.setup(ipt, chainRules)
+		err = testChain.setup(ipt)
 		Expect(err).NotTo(HaveOccurred())
 
 		// Make sure there are only two rules
@@ -167,18 +163,14 @@ var _ = Describe("chain tests", func() {
 		rules, err := ipt.List(TABLE, testChain.name)
 		Expect(err).NotTo(HaveOccurred())
 
-		Expect(len(rules)).To(Equal(2))
+		Expect(len(rules)).To(Equal(3))
 
 	})
 
 	It("deletes chains idempotently", func() {
 		defer cleanup()
 
-		// Create the chain
-		chainRules := [][]string{
-			{"-m", "comment", "--comment", "test", "-j", "RETURN"},
-		}
-		err := testChain.setup(ipt, chainRules)
+		err := testChain.setup(ipt)
 		Expect(err).NotTo(HaveOccurred())
 
 		err = testChain.teardown(ipt)

plugins/meta/portmap/main.go

@@ -47,10 +47,12 @@ type PortMapEntry struct {
 
 type PortMapConf struct {
 	types.NetConf
-	SNAT          *bool     `json:"snat,omitempty"`
-	ConditionsV4  *[]string `json:"conditionsV4"`
-	ConditionsV6  *[]string `json:"conditionsV6"`
-	RuntimeConfig struct {
+	SNAT                 *bool     `json:"snat,omitempty"`
+	ConditionsV4         *[]string `json:"conditionsV4"`
+	ConditionsV6         *[]string `json:"conditionsV6"`
+	MarkMasqBit          *int      `json:"markMasqBit"`
+	ExternalSetMarkChain *string   `json:"externalSetMarkChain"`
+	RuntimeConfig        struct {
 		PortMaps []PortMapEntry `json:"portMappings,omitempty"`
 	} `json:"runtimeConfig,omitempty"`
 	RawPrevResult map[string]interface{} `json:"prevResult,omitempty"`
@@ -63,6 +65,10 @@ type PortMapConf struct {
 	ContIPv6    net.IP `json:"-"`
 }
 
+// The default mark bit to signal that masquerading is required
+// Kubernetes uses 14 and 15, Calico uses 20-31.
+const DefaultMarkBit = 13
+
 func cmdAdd(args *skel.CmdArgs) error {
 	netConf, err := parseConfig(args.StdinData, args.IfName)
 	if err != nil {
@@ -145,6 +151,19 @@ func parseConfig(stdin []byte, ifName string) (*PortMapConf, error) {
 		conf.SNAT = &tvar
 	}
 
+	if conf.MarkMasqBit != nil && conf.ExternalSetMarkChain != nil {
+		return nil, fmt.Errorf("Cannot specify externalSetMarkChain and markMasqBit")
+	}
+
+	if conf.MarkMasqBit == nil {
+		bvar := DefaultMarkBit // go constants are "special"
+		conf.MarkMasqBit = &bvar
+	}
+
+	if *conf.MarkMasqBit < 0 || *conf.MarkMasqBit > 31 {
+		return nil, fmt.Errorf("MasqMarkBit must be between 0 and 31")
+	}
+
 	// Reject invalid port numbers
 	for _, pm := range conf.RuntimeConfig.PortMaps {
 		if pm.ContainerPort <= 0 {

plugins/meta/portmap/portmap.go

@@ -17,6 +17,7 @@ package main
 import (
 	"fmt"
 	"net"
+	"sort"
 	"strconv"
 
 	"github.com/containernetworking/plugins/pkg/utils/sysctl"
@@ -24,33 +25,26 @@ import (
 )
 
 // This creates the chains to be added to iptables. The basic structure is
-// a bit complex for efficiencies sake. We create 2 chains: a summary chain
+// a bit complex for efficiency's sake. We create 2 chains: a summary chain
 // that is shared between invocations, and an invocation (container)-specific
 // chain. This minimizes the number of operations on the top level, but allows
 // for easy cleanup.
 //
-// We also create DNAT chains to rewrite destinations, and SNAT chains so that
-// connections to localhost work.
-//
 // The basic setup (all operations are on the nat table) is:
 //
 // DNAT case (rewrite destination IP and port):
-// PREROUTING, OUTPUT: --dst-type local -j CNI-HOSTPORT_DNAT
-// CNI-HOSTPORT-DNAT: -j CNI-DN-abcd123
+// PREROUTING, OUTPUT: --dst-type local -j CNI-HOSTPORT-DNAT
+// CNI-HOSTPORT-DNAT: --destination-ports 8080,8081 -j CNI-DN-abcd123
 // CNI-DN-abcd123: -p tcp --dport 8080 -j DNAT --to-destination 192.0.2.33:80
 // CNI-DN-abcd123: -p tcp --dport 8081 -j DNAT ...
-//
-// SNAT case (rewrite source IP from localhost after dnat):
-// POSTROUTING: -s 127.0.0.1 ! -d 127.0.0.1 -j CNI-HOSTPORT-SNAT
-// CNI-HOSTPORT-SNAT: -j CNI-SN-abcd123
-// CNI-SN-abcd123: -p tcp -s 127.0.0.1 -d 192.0.2.33 --dport 80 -j MASQUERADE
-// CNI-SN-abcd123: -p tcp -s 127.0.0.1 -d 192.0.2.33 --dport 90 -j MASQUERADE
 
 // The names of the top-level summary chains.
 // These should never be changed, or else upgrading will require manual
 // intervention.
 const TopLevelDNATChainName = "CNI-HOSTPORT-DNAT"
-const TopLevelSNATChainName = "CNI-HOSTPORT-SNAT"
+const SetMarkChainName = "CNI-HOSTPORT-SETMARK"
+const MarkMasqChainName = "CNI-HOSTPORT-MASQ"
+const OldTopLevelSNATChainName = "CNI-HOSTPORT-SNAT"
 
 // forwardPorts establishes port forwarding to a given container IP.
 // containerIP can be either v4 or v6.
@@ -59,48 +53,35 @@ func forwardPorts(config *PortMapConf, containerIP net.IP) error {
 
 	var ipt *iptables.IPTables
 	var err error
-	var conditions *[]string
 
 	if isV6 {
 		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv6)
-		conditions = config.ConditionsV6
 	} else {
 		ipt, err = iptables.NewWithProtocol(iptables.ProtocolIPv4)
-		conditions = config.ConditionsV4
 	}
 	if err != nil {
 		return fmt.Errorf("failed to open iptables: %v", err)
 	}
 
-	toplevelDnatChain := genToplevelDnatChain()
-	if err := toplevelDnatChain.setup(ipt, nil); err != nil {
-		return fmt.Errorf("failed to create top-level DNAT chain: %v", err)
-	}
+	// Enable masquerading for traffic as necessary.
+	// The DNAT chain sets a mark bit for traffic that needs masq:
+	// - connections from localhost
+	// - hairpin traffic back to the container
+	// Idempotently create the rule that masquerades traffic with this mark.
+	// Need to do this first; the DNAT rules reference these chains
+	if *config.SNAT {
+		if config.ExternalSetMarkChain == nil {
+			setMarkChain := genSetMarkChain(*config.MarkMasqBit)
+			if err := setMarkChain.setup(ipt); err != nil {
+				return fmt.Errorf("unable to create chain %s: %v", setMarkChain.name, err)
+			}
 
-	dnatChain := genDnatChain(config.Name, config.ContainerID, conditions)
-	_ = dnatChain.teardown(ipt) // If we somehow collide on this container ID + network, cleanup
-
-	dnatRules := dnatRules(config.RuntimeConfig.PortMaps, containerIP)
-	if err := dnatChain.setup(ipt, dnatRules); err != nil {
-		return fmt.Errorf("unable to setup DNAT: %v", err)
-	}
-
-	// Enable SNAT for connections to localhost.
-	// This won't work for ipv6, since the kernel doesn't have the equvalent
-	// route_localnet sysctl.
-	if *config.SNAT && !isV6 {
-		toplevelSnatChain := genToplevelSnatChain(isV6)
-		if err := toplevelSnatChain.setup(ipt, nil); err != nil {
-			return fmt.Errorf("failed to create top-level SNAT chain: %v", err)
+			masqChain := genMarkMasqChain(*config.MarkMasqBit)
+			if err := masqChain.setup(ipt); err != nil {
+				return fmt.Errorf("unable to create chain %s: %v", setMarkChain.name, err)
+			}
 		}
 
-		snatChain := genSnatChain(config.Name, config.ContainerID)
-		_ = snatChain.teardown(ipt)
-
-		snatRules := snatRules(config.RuntimeConfig.PortMaps, containerIP)
-		if err := snatChain.setup(ipt, snatRules); err != nil {
-			return fmt.Errorf("unable to setup SNAT: %v", err)
-		}
 		if !isV6 {
 			// Set the route_localnet bit on the host interface, so that
 			// 127/8 can cross a routing boundary.
@@ -113,6 +94,20 @@ func forwardPorts(config *PortMapConf, containerIP net.IP) error {
 		}
 	}
 
+	// Generate the DNAT (actual port forwarding) rules
+	toplevelDnatChain := genToplevelDnatChain()
+	if err := toplevelDnatChain.setup(ipt); err != nil {
+		return fmt.Errorf("failed to create top-level DNAT chain: %v", err)
+	}
+
+	dnatChain := genDnatChain(config.Name, config.ContainerID)
+	// First, idempotently tear down this chain in case there was some
+	// sort of collision or bad state.
+	fillDnatRules(&dnatChain, config, containerIP)
+	if err := dnatChain.setup(ipt); err != nil {
+		return fmt.Errorf("unable to setup DNAT: %v", err)
+	}
+
 	return nil
 }
 
@@ -124,106 +119,153 @@ func genToplevelDnatChain() chain {
 	return chain{
 		table: "nat",
 		name:  TopLevelDNATChainName,
-		entryRule: []string{
+		entryRules: [][]string{{
 			"-m", "addrtype",
 			"--dst-type", "LOCAL",
-		},
+		}},
 		entryChains: []string{"PREROUTING", "OUTPUT"},
 	}
 }
 
 // genDnatChain creates the per-container chain.
 // Conditions are any static entry conditions for the chain.
-func genDnatChain(netName, containerID string, conditions *[]string) chain {
-	name := formatChainName("DN-", netName, containerID)
-	comment := fmt.Sprintf(`dnat name: "%s" id: "%s"`, netName, containerID)
-
-	ch := chain{
-		table: "nat",
-		name:  name,
-		entryRule: []string{
-			"-m", "comment",
-			"--comment", comment,
-		},
+func genDnatChain(netName, containerID string) chain {
+	return chain{
+		table:       "nat",
+		name:        formatChainName("DN-", netName, containerID),
 		entryChains: []string{TopLevelDNATChainName},
 	}
-	if conditions != nil && len(*conditions) != 0 {
-		ch.entryRule = append(ch.entryRule, *conditions...)
-	}
-
-	return ch
 }
 
 // dnatRules generates the destination NAT rules, one per port, to direct
 // traffic from hostip:hostport to podip:podport
-func dnatRules(entries []PortMapEntry, containerIP net.IP) [][]string {
-	out := make([][]string, 0, len(entries))
+func fillDnatRules(c *chain, config *PortMapConf, containerIP net.IP) {
+	isV6 := (containerIP.To4() == nil)
+	comment := trimComment(fmt.Sprintf(`dnat name: "%s" id: "%s"`, config.Name, config.ContainerID))
+	entries := config.RuntimeConfig.PortMaps
+	setMarkChainName := SetMarkChainName
+	if config.ExternalSetMarkChain != nil {
+		setMarkChainName = *config.ExternalSetMarkChain
+	}
+
+	//Generate the dnat entry rules. We'll use multiport, but it ony accepts
+	// up to 15 rules, so partition the list if needed.
+	// Do it in a stable order for testing
+	protoPorts := groupByProto(entries)
+	protos := []string{}
+	for proto := range protoPorts {
+		protos = append(protos, proto)
+	}
+	sort.Strings(protos)
+	for _, proto := range protos {
+		for _, portSpec := range splitPortList(protoPorts[proto]) {
+			r := []string{
+				"-m", "comment",
+				"--comment", comment,
+				"-m", "multiport",
+				"-p", proto,
+				"--destination-ports", portSpec,
+			}
+
+			if isV6 && config.ConditionsV6 != nil && len(*config.ConditionsV6) > 0 {
+				r = append(r, *config.ConditionsV6...)
+			} else if !isV6 && config.ConditionsV4 != nil && len(*config.ConditionsV4) > 0 {
+				r = append(r, *config.ConditionsV4...)
+			}
+			c.entryRules = append(c.entryRules, r)
+		}
+	}
+
+	// For every entry, generate 3 rules:
+	// - mark hairpin for masq
+	// - mark localhost for masq (for v4)
+	// - do dnat
+	// the ordering is important here; the mark rules must be first.
+	c.rules = make([][]string, 0, 3*len(entries))
 	for _, entry := range entries {
-		rule := []string{
+		ruleBase := []string{
 			"-p", entry.Protocol,
 			"--dport", strconv.Itoa(entry.HostPort)}
-
 		if entry.HostIP != "" {
-			rule = append(rule,
+			ruleBase = append(ruleBase,
 				"-d", entry.HostIP)
 		}
 
-		rule = append(rule,
+		// Add mark-to-masquerade rules for hairpin and localhost
+		if *config.SNAT {
+			// hairpin
+			hpRule := make([]string, len(ruleBase), len(ruleBase)+4)
+			copy(hpRule, ruleBase)
+
+			hpRule = append(hpRule,
+				"-s", containerIP.String(),
+				"-j", setMarkChainName,
+			)
+			c.rules = append(c.rules, hpRule)
+
+			if !isV6 {
+				// localhost
+				localRule := make([]string, len(ruleBase), len(ruleBase)+4)
+				copy(localRule, ruleBase)
+
+				localRule = append(localRule,
+					"-s", "127.0.0.1",
+					"-j", setMarkChainName,
+				)
+				c.rules = append(c.rules, localRule)
+			}
+		}
+
+		// The actual dnat rule
+		dnatRule := make([]string, len(ruleBase), len(ruleBase)+4)
+		copy(dnatRule, ruleBase)
+		dnatRule = append(dnatRule,
 			"-j", "DNAT",
-			"--to-destination", fmtIpPort(containerIP, entry.ContainerPort))
-
-		out = append(out, rule)
-	}
-	return out
-}
-
-// genToplevelSnatChain creates the top-level summary snat chain.
-// IMPORTANT: do not change this, or else upgrading plugins will require
-// manual intervention
-func genToplevelSnatChain(isV6 bool) chain {
-	return chain{
-		table: "nat",
-		name:  TopLevelSNATChainName,
-		entryRule: []string{
-			"-s", localhostIP(isV6),
-			"!", "-d", localhostIP(isV6),
-		},
-		entryChains: []string{"POSTROUTING"},
+			"--to-destination", fmtIpPort(containerIP, entry.ContainerPort),
+		)
+		c.rules = append(c.rules, dnatRule)
 	}
 }
 
-// genSnatChain creates the snat (localhost) chain for this container.
-func genSnatChain(netName, containerID string) chain {
-	name := formatChainName("SN-", netName, containerID)
-	comment := fmt.Sprintf(`snat name: "%s" id: "%s"`, netName, containerID)
-
-	return chain{
+// genSetMarkChain creates the SETMARK chain - the chain that sets the
+// "to-be-masqueraded" mark and returns.
+// Chains are idempotent, so we'll always create this.
+func genSetMarkChain(markBit int) chain {
+	markValue := 1 << uint(markBit)
+	markDef := fmt.Sprintf("%#x/%#x", markValue, markValue)
+	ch := chain{
 		table: "nat",
-		name:  name,
-		entryRule: []string{
+		name:  SetMarkChainName,
+		rules: [][]string{{
 			"-m", "comment",
-			"--comment", comment,
-		},
-		entryChains: []string{TopLevelSNATChainName},
+			"--comment", "CNI portfwd masquerade mark",
+			"-j", "MARK",
+			"--set-xmark", markDef,
+		}},
 	}
+	return ch
 }
 
-// snatRules sets up masquerading for connections to localhost:hostport,
-// rewriting the source so that returning packets are correct.
-func snatRules(entries []PortMapEntry, containerIP net.IP) [][]string {
-	isV6 := (containerIP.To4() == nil)
-
-	out := make([][]string, 0, len(entries))
-	for _, entry := range entries {
-		out = append(out, []string{
-			"-p", entry.Protocol,
-			"-s", localhostIP(isV6),
-			"-d", containerIP.String(),
-			"--dport", strconv.Itoa(entry.ContainerPort),
+// genMarkMasqChain creates the chain that masquerades all packets marked
+// in the SETMARK chain
+func genMarkMasqChain(markBit int) chain {
+	markValue := 1 << uint(markBit)
+	markDef := fmt.Sprintf("%#x/%#x", markValue, markValue)
+	ch := chain{
+		table:       "nat",
+		name:        MarkMasqChainName,
+		entryChains: []string{"POSTROUTING"},
+		entryRules: [][]string{{
+			"-m", "comment",
+			"--comment", "CNI portfwd requiring masquerade",
+		}},
+		rules: [][]string{{
+			"-m", "mark",
+			"--mark", markDef,
 			"-j", "MASQUERADE",
-		})
+		}},
 	}
-	return out
+	return ch
 }
 
 // enableLocalnetRouting tells the kernel not to treat 127/8 as a martian,
@@ -234,6 +276,18 @@ func enableLocalnetRouting(ifName string) error {
 	return err
 }
 
+// genOldSnatChain is no longer used, but used to be created. We'll try and
+// tear it down in case the plugin version changed between ADD and DEL
+func genOldSnatChain(netName, containerID string) chain {
+	name := formatChainName("SN-", netName, containerID)
+
+	return chain{
+		table:       "nat",
+		name:        name,
+		entryChains: []string{OldTopLevelSNATChainName},
+	}
+}
+
 // unforwardPorts deletes any iptables rules created by this plugin.
 // It should be idempotent - it will not error if the chain does not exist.
 //
@@ -245,8 +299,10 @@ func enableLocalnetRouting(ifName string) error {
 // So, we first check that iptables is "generally OK" by doing a check. If
 // not, we ignore the error, unless neither v4 nor v6 are OK.
 func unforwardPorts(config *PortMapConf) error {
-	dnatChain := genDnatChain(config.Name, config.ContainerID, nil)
-	snatChain := genSnatChain(config.Name, config.ContainerID)
+	dnatChain := genDnatChain(config.Name, config.ContainerID)
+
+	// Might be lying around from old versions
+	oldSnatChain := genOldSnatChain(config.Name, config.ContainerID)
 
 	ip4t := maybeGetIptables(false)
 	ip6t := maybeGetIptables(true)
@@ -258,16 +314,14 @@ func unforwardPorts(config *PortMapConf) error {
 		if err := dnatChain.teardown(ip4t); err != nil {
 			return fmt.Errorf("could not teardown ipv4 dnat: %v", err)
 		}
-		if err := snatChain.teardown(ip4t); err != nil {
-			return fmt.Errorf("could not teardown ipv4 snat: %v", err)
-		}
+		oldSnatChain.teardown(ip4t)
 	}
 
 	if ip6t != nil {
 		if err := dnatChain.teardown(ip6t); err != nil {
 			return fmt.Errorf("could not teardown ipv6 dnat: %v", err)
 		}
-		// no SNAT teardown because it doesn't work for v6
+		oldSnatChain.teardown(ip6t)
 	}
 	return nil
 }

plugins/meta/portmap/portmap_integ_test.go

@@ -15,12 +15,14 @@
 package main
 
 import (
+	"bytes"
 	"fmt"
 	"math/rand"
 	"net"
 	"os"
+	"os/exec"
 	"path/filepath"
-	"time"
+	"strconv"
 
 	"github.com/containernetworking/cni/libcni"
 	"github.com/containernetworking/cni/pkg/types/current"
@@ -28,19 +30,20 @@ import (
 	"github.com/coreos/go-iptables/iptables"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
+	"github.com/onsi/gomega/gexec"
 	"github.com/vishvananda/netlink"
 )
 
 const TIMEOUT = 90
 
 var _ = Describe("portmap integration tests", func() {
-	rand.Seed(time.Now().UTC().UnixNano())
-
-	var configList *libcni.NetworkConfigList
-	var cniConf *libcni.CNIConfig
-	var targetNS ns.NetNS
-	var containerPort int
-	var closeChan chan interface{}
+	var (
+		configList    *libcni.NetworkConfigList
+		cniConf       *libcni.CNIConfig
+		targetNS      ns.NetNS
+		containerPort int
+		session       *gexec.Session
+	)
 
 	BeforeEach(func() {
 		var err error
@@ -80,12 +83,12 @@ var _ = Describe("portmap integration tests", func() {
 		fmt.Fprintln(GinkgoWriter, "namespace:", targetNS.Path())
 
 		// Start an echo server and get the port
-		containerPort, closeChan, err = RunEchoServerInNS(targetNS)
+		containerPort, session, err = StartEchoServerInNamespace(targetNS)
 		Expect(err).NotTo(HaveOccurred())
-
 	})
 
 	AfterEach(func() {
+		session.Terminate().Wait()
 		if targetNS != nil {
 			targetNS.Close()
 		}
@@ -123,13 +126,20 @@ var _ = Describe("portmap integration tests", func() {
 		// we'll also manually check the iptables chains
 		ipt, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
 		Expect(err).NotTo(HaveOccurred())
-		dnatChainName := genDnatChain("cni-portmap-unit-test", runtimeConfig.ContainerID, nil).name
+		dnatChainName := genDnatChain("cni-portmap-unit-test", runtimeConfig.ContainerID).name
 
 		// Create the network
 		resI, err := cniConf.AddNetworkList(configList, &runtimeConfig)
 		Expect(err).NotTo(HaveOccurred())
 		defer deleteNetwork()
 
+		// Undo Docker's forwarding policy
+		cmd := exec.Command("iptables", "-t", "filter",
+			"-P", "FORWARD", "ACCEPT")
+		cmd.Stderr = GinkgoWriter
+		err = cmd.Run()
+		Expect(err).NotTo(HaveOccurred())
+
 		// Check the chain exists
 		_, err = ipt.List("nat", dnatChainName)
 		Expect(err).NotTo(HaveOccurred())
@@ -154,16 +164,19 @@ var _ = Describe("portmap integration tests", func() {
 			hostIP, hostPort, contIP, containerPort)
 
 		// Sanity check: verify that the container is reachable directly
-		contOK := testEchoServer(fmt.Sprintf("%s:%d", contIP.String(), containerPort))
+		contOK := testEchoServer(contIP.String(), containerPort, "")
 
 		// Verify that a connection to the forwarded port works
-		dnatOK := testEchoServer(fmt.Sprintf("%s:%d", hostIP, hostPort))
+		dnatOK := testEchoServer(hostIP, hostPort, "")
 
 		// Verify that a connection to localhost works
-		snatOK := testEchoServer(fmt.Sprintf("%s:%d", "127.0.0.1", hostPort))
+		snatOK := testEchoServer("127.0.0.1", hostPort, "")
+
+		// verify that hairpin works
+		hairpinOK := testEchoServer(hostIP, hostPort, targetNS.Path())
 
 		// Cleanup
-		close(closeChan)
+		session.Terminate()
 		err = deleteNetwork()
 		Expect(err).NotTo(HaveOccurred())
 
@@ -181,6 +194,9 @@ var _ = Describe("portmap integration tests", func() {
 		if !snatOK {
 			Fail("connection to 127.0.0.1 was not forwarded")
 		}
+		if !hairpinOK {
+			Fail("Hairpin connection failed")
+		}
 
 		close(done)
 
@@ -188,40 +204,33 @@ var _ = Describe("portmap integration tests", func() {
 })
 
 // testEchoServer returns true if we found an echo server on the port
-func testEchoServer(address string) bool {
-	fmt.Fprintln(GinkgoWriter, "dialing", address)
-	conn, err := net.Dial("tcp", address)
-	if err != nil {
-		fmt.Fprintln(GinkgoWriter, "connection to", address, "failed:", err)
-		return false
-	}
-	defer conn.Close()
-
-	conn.SetDeadline(time.Now().Add(TIMEOUT * time.Second))
-	fmt.Fprintln(GinkgoWriter, "connected to", address)
-
+func testEchoServer(address string, port int, netns string) bool {
 	message := "Aliquid melius quam pessimum optimum non est."
-	_, err = fmt.Fprint(conn, message)
+
+	bin, err := exec.LookPath("nc")
+	Expect(err).NotTo(HaveOccurred())
+	var cmd *exec.Cmd
+	if netns != "" {
+		netns = filepath.Base(netns)
+		cmd = exec.Command("ip", "netns", "exec", netns, bin, "-v", address, strconv.Itoa(port))
+	} else {
+		cmd = exec.Command("nc", address, strconv.Itoa(port))
+	}
+	cmd.Stdin = bytes.NewBufferString(message)
+	cmd.Stderr = GinkgoWriter
+	out, err := cmd.Output()
 	if err != nil {
-		fmt.Fprintln(GinkgoWriter, "sending message to", address, " failed:", err)
+		fmt.Fprintln(GinkgoWriter, "got non-zero exit from ", cmd.Args)
 		return false
 	}
 
-	conn.SetDeadline(time.Now().Add(TIMEOUT * time.Second))
-	fmt.Fprintln(GinkgoWriter, "reading...")
-	response := make([]byte, len(message))
-	_, err = conn.Read(response)
-	if err != nil {
-		fmt.Fprintln(GinkgoWriter, "receiving message from", address, " failed:", err)
+	if string(out) != message {
+		fmt.Fprintln(GinkgoWriter, "returned message didn't match?")
+		fmt.Fprintln(GinkgoWriter, string(out))
 		return false
 	}
 
-	fmt.Fprintln(GinkgoWriter, "read...")
-	if string(response) == message {
-		return true
-	}
-	fmt.Fprintln(GinkgoWriter, "returned message didn't match?")
-	return false
+	return true
 }
 
 func getLocalIP() string {

plugins/meta/portmap/portmap_suite_test.go

@@ -15,89 +15,64 @@
 package main
 
 import (
-	"fmt"
+	"math/rand"
 	"net"
-	"time"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
 
 	"github.com/containernetworking/plugins/pkg/ns"
 
 	. "github.com/onsi/ginkgo"
+	"github.com/onsi/ginkgo/config"
 	. "github.com/onsi/gomega"
+	"github.com/onsi/gomega/gbytes"
+	"github.com/onsi/gomega/gexec"
 
 	"testing"
 )
 
 func TestPortmap(t *testing.T) {
+	rand.Seed(config.GinkgoConfig.RandomSeed)
+
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "portmap Suite")
 }
 
-// OpenEchoServer opens a server that listens until closeChan is closed.
-// It opens on a random port and sends the port number on portChan when
-// the server is up and running. If an error is encountered, closes portChan.
-// If closeChan is closed, closes the socket.
-func OpenEchoServer(portChan chan<- int, closeChan <-chan interface{}) error {
-	laddr, err := net.ResolveTCPAddr("tcp", "0.0.0.0:0")
-	if err != nil {
-		close(portChan)
-		return err
-	}
-	sock, err := net.ListenTCP("tcp", laddr)
-	if err != nil {
-		close(portChan)
-		return err
-	}
-	defer sock.Close()
+var echoServerBinaryPath string
 
-	switch addr := sock.Addr().(type) {
-	case *net.TCPAddr:
-		portChan <- addr.Port
-	default:
-		close(portChan)
-		return fmt.Errorf("addr cast failed!")
-	}
-	for {
-		select {
-		case <-closeChan:
-			break
-		default:
-		}
+var _ = SynchronizedBeforeSuite(func() []byte {
+	binaryPath, err := gexec.Build("github.com/containernetworking/plugins/pkg/testutils/echosvr")
+	Expect(err).NotTo(HaveOccurred())
+	return []byte(binaryPath)
+}, func(data []byte) {
+	echoServerBinaryPath = string(data)
+})
 
-		sock.SetDeadline(time.Now().Add(time.Second))
-		con, err := sock.AcceptTCP()
-		if err != nil {
-			if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
-				continue
-			}
-			continue
-		}
+var _ = SynchronizedAfterSuite(func() {}, func() {
+	gexec.CleanupBuildArtifacts()
+})
 
-		buf := make([]byte, 512)
-		con.Read(buf)
-		con.Write(buf)
-		con.Close()
-	}
+func startInNetNS(binPath string, netNS ns.NetNS) (*gexec.Session, error) {
+	baseName := filepath.Base(netNS.Path())
+	// we are relying on the netNS path living in /var/run/netns
+	// where `ip netns exec` can find it
+	cmd := exec.Command("ip", "netns", "exec", baseName, binPath)
+	session, err := gexec.Start(cmd, GinkgoWriter, GinkgoWriter)
+	return session, err
 }
 
-func RunEchoServerInNS(netNS ns.NetNS) (int, chan interface{}, error) {
-	portChan := make(chan int)
-	closeChan := make(chan interface{})
+func StartEchoServerInNamespace(netNS ns.NetNS) (int, *gexec.Session, error) {
+	session, err := startInNetNS(echoServerBinaryPath, netNS)
+	Expect(err).NotTo(HaveOccurred())
 
-	go func() {
-		err := netNS.Do(func(ns.NetNS) error {
-			OpenEchoServer(portChan, closeChan)
-			return nil
-		})
-		// Somehow the ns.Do failed
-		if err != nil {
-			close(portChan)
-		}
-	}()
+	// wait for it to print it's address on stdout
+	Eventually(session.Out).Should(gbytes.Say("\n"))
+	_, portString, err := net.SplitHostPort(strings.TrimSpace(string(session.Out.Contents())))
+	Expect(err).NotTo(HaveOccurred())
 
-	portNum := <-portChan
-	if portNum == 0 {
-		return 0, nil, fmt.Errorf("failed to execute server")
-	}
-
-	return portNum, closeChan, nil
+	port, err := strconv.Atoi(portString)
+	Expect(err).NotTo(HaveOccurred())
+	return port, session, nil
 }

plugins/meta/portmap/portmap_test.go

@@ -15,6 +15,7 @@
 package main
 
 import (
+	"fmt"
 	"net"
 
 	. "github.com/onsi/ginkgo"
@@ -25,13 +26,6 @@ var _ = Describe("portmapping configuration", func() {
 	netName := "testNetName"
 	containerID := "icee6giejonei6sohng6ahngee7laquohquee9shiGo7fohferakah3Feiyoolu2pei7ciPhoh7shaoX6vai3vuf0ahfaeng8yohb9ceu0daez5hashee8ooYai5wa3y"
 
-	mappings := []PortMapEntry{
-		{80, 90, "tcp", ""},
-		{1000, 2000, "udp", ""},
-	}
-	ipv4addr := net.ParseIP("192.2.0.1")
-	ipv6addr := net.ParseIP("2001:db8::1")
-
 	Context("config parsing", func() {
 		It("Correctly parses an ADD config", func() {
 			configBytes := []byte(`{
@@ -156,101 +150,179 @@ var _ = Describe("portmapping configuration", func() {
 
 	Describe("Generating chains", func() {
 		Context("for DNAT", func() {
-			It("generates a correct container chain", func() {
-				ch := genDnatChain(netName, containerID, &[]string{"-m", "hello"})
+			It("generates a correct standard container chain", func() {
+				ch := genDnatChain(netName, containerID)
 
 				Expect(ch).To(Equal(chain{
-					table: "nat",
-					name:  "CNI-DN-bfd599665540dd91d5d28",
-					entryRule: []string{
-						"-m", "comment",
-						"--comment", `dnat name: "testNetName" id: "` + containerID + `"`,
-						"-m", "hello",
-					},
+					table:       "nat",
+					name:        "CNI-DN-bfd599665540dd91d5d28",
 					entryChains: []string{TopLevelDNATChainName},
 				}))
+				configBytes := []byte(`{
+	"name": "test",
+	"type": "portmap",
+	"cniVersion": "0.3.1",
+	"runtimeConfig": {
+		"portMappings": [
+			{ "hostPort": 8080, "containerPort": 80, "protocol": "tcp"},
+			{ "hostPort": 8081, "containerPort": 80, "protocol": "tcp"},
+			{ "hostPort": 8080, "containerPort": 81, "protocol": "udp"},
+			{ "hostPort": 8082, "containerPort": 82, "protocol": "udp"}
+		]
+	},
+	"snat": true,
+	"conditionsV4": ["a", "b"],
+	"conditionsV6": ["c", "d"]
+}`)
+
+				conf, err := parseConfig(configBytes, "foo")
+				Expect(err).NotTo(HaveOccurred())
+				conf.ContainerID = containerID
+
+				ch = genDnatChain(conf.Name, containerID)
+				Expect(ch).To(Equal(chain{
+					table:       "nat",
+					name:        "CNI-DN-67e92b96e692a494b6b85",
+					entryChains: []string{"CNI-HOSTPORT-DNAT"},
+				}))
+
+				fillDnatRules(&ch, conf, net.ParseIP("10.0.0.2"))
+
+				Expect(ch.entryRules).To(Equal([][]string{
+					{"-m", "comment", "--comment",
+						fmt.Sprintf("dnat name: \"test\" id: \"%s\"", containerID),
+						"-m", "multiport",
+						"-p", "tcp",
+						"--destination-ports", "8080,8081",
+						"a", "b"},
+					{"-m", "comment", "--comment",
+						fmt.Sprintf("dnat name: \"test\" id: \"%s\"", containerID),
+						"-m", "multiport",
+						"-p", "udp",
+						"--destination-ports", "8080,8082",
+						"a", "b"},
+				}))
+
+				Expect(ch.rules).To(Equal([][]string{
+					{"-p", "tcp", "--dport", "8080", "-s", "10.0.0.2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "tcp", "--dport", "8080", "-s", "127.0.0.1", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "tcp", "--dport", "8080", "-j", "DNAT", "--to-destination", "10.0.0.2:80"},
+					{"-p", "tcp", "--dport", "8081", "-s", "10.0.0.2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "tcp", "--dport", "8081", "-s", "127.0.0.1", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "tcp", "--dport", "8081", "-j", "DNAT", "--to-destination", "10.0.0.2:80"},
+					{"-p", "udp", "--dport", "8080", "-s", "10.0.0.2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "udp", "--dport", "8080", "-s", "127.0.0.1", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "udp", "--dport", "8080", "-j", "DNAT", "--to-destination", "10.0.0.2:81"},
+					{"-p", "udp", "--dport", "8082", "-s", "10.0.0.2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "udp", "--dport", "8082", "-s", "127.0.0.1", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "udp", "--dport", "8082", "-j", "DNAT", "--to-destination", "10.0.0.2:82"},
+				}))
+
+				ch.rules = nil
+				ch.entryRules = nil
+
+				fillDnatRules(&ch, conf, net.ParseIP("2001:db8::2"))
+
+				Expect(ch.rules).To(Equal([][]string{
+					{"-p", "tcp", "--dport", "8080", "-s", "2001:db8::2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "tcp", "--dport", "8080", "-j", "DNAT", "--to-destination", "[2001:db8::2]:80"},
+					{"-p", "tcp", "--dport", "8081", "-s", "2001:db8::2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "tcp", "--dport", "8081", "-j", "DNAT", "--to-destination", "[2001:db8::2]:80"},
+					{"-p", "udp", "--dport", "8080", "-s", "2001:db8::2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "udp", "--dport", "8080", "-j", "DNAT", "--to-destination", "[2001:db8::2]:81"},
+					{"-p", "udp", "--dport", "8082", "-s", "2001:db8::2", "-j", "CNI-HOSTPORT-SETMARK"},
+					{"-p", "udp", "--dport", "8082", "-j", "DNAT", "--to-destination", "[2001:db8::2]:82"},
+				}))
+
+				// Disable snat, generate rules
+				ch.rules = nil
+				ch.entryRules = nil
+				fvar := false
+				conf.SNAT = &fvar
+
+				fillDnatRules(&ch, conf, net.ParseIP("10.0.0.2"))
+				Expect(ch.rules).To(Equal([][]string{
+					{"-p", "tcp", "--dport", "8080", "-j", "DNAT", "--to-destination", "10.0.0.2:80"},
+					{"-p", "tcp", "--dport", "8081", "-j", "DNAT", "--to-destination", "10.0.0.2:80"},
+					{"-p", "udp", "--dport", "8080", "-j", "DNAT", "--to-destination", "10.0.0.2:81"},
+					{"-p", "udp", "--dport", "8082", "-j", "DNAT", "--to-destination", "10.0.0.2:82"},
+				}))
+			})
+
+			It("generates a correct chain with external mark", func() {
+				ch := genDnatChain(netName, containerID)
+
+				Expect(ch).To(Equal(chain{
+					table:       "nat",
+					name:        "CNI-DN-bfd599665540dd91d5d28",
+					entryChains: []string{TopLevelDNATChainName},
+				}))
+				configBytes := []byte(`{
+	"name": "test",
+	"type": "portmap",
+	"cniVersion": "0.3.1",
+	"runtimeConfig": {
+		"portMappings": [
+			{ "hostPort": 8080, "containerPort": 80, "protocol": "tcp"}
+		]
+	},
+	"externalSetMarkChain": "PLZ-SET-MARK",
+	"conditionsV4": ["a", "b"],
+	"conditionsV6": ["c", "d"]
+}`)
+
+				conf, err := parseConfig(configBytes, "foo")
+				Expect(err).NotTo(HaveOccurred())
+				conf.ContainerID = containerID
+
+				ch = genDnatChain(conf.Name, containerID)
+				fillDnatRules(&ch, conf, net.ParseIP("10.0.0.2"))
+				Expect(ch.rules).To(Equal([][]string{
+					{"-p", "tcp", "--dport", "8080", "-s", "10.0.0.2", "-j", "PLZ-SET-MARK"},
+					{"-p", "tcp", "--dport", "8080", "-s", "127.0.0.1", "-j", "PLZ-SET-MARK"},
+					{"-p", "tcp", "--dport", "8080", "-j", "DNAT", "--to-destination", "10.0.0.2:80"},
+				}))
 			})
 
 			It("generates a correct top-level chain", func() {
 				ch := genToplevelDnatChain()
 
 				Expect(ch).To(Equal(chain{
-					table: "nat",
-					name:  "CNI-HOSTPORT-DNAT",
-					entryRule: []string{
-						"-m", "addrtype",
-						"--dst-type", "LOCAL",
-					},
+					table:       "nat",
+					name:        "CNI-HOSTPORT-DNAT",
 					entryChains: []string{"PREROUTING", "OUTPUT"},
+					entryRules:  [][]string{{"-m", "addrtype", "--dst-type", "LOCAL"}},
 				}))
 			})
-		})
-
-		Context("for SNAT", func() {
-			It("generates a correct container chain", func() {
-				ch := genSnatChain(netName, containerID)
 
+			It("generates the correct mark chains", func() {
+				masqBit := 5
+				ch := genSetMarkChain(masqBit)
 				Expect(ch).To(Equal(chain{
 					table: "nat",
-					name:  "CNI-SN-bfd599665540dd91d5d28",
-					entryRule: []string{
+					name:  "CNI-HOSTPORT-SETMARK",
+					rules: [][]string{{
 						"-m", "comment",
-						"--comment", `snat name: "testNetName" id: "` + containerID + `"`,
-					},
-					entryChains: []string{TopLevelSNATChainName},
+						"--comment", "CNI portfwd masquerade mark",
+						"-j", "MARK",
+						"--set-xmark", "0x20/0x20",
+					}},
 				}))
-			})
 
-			It("generates a correct top-level chain", func() {
-				Context("for ipv4", func() {
-					ch := genToplevelSnatChain(false)
-					Expect(ch).To(Equal(chain{
-						table: "nat",
-						name:  "CNI-HOSTPORT-SNAT",
-						entryRule: []string{
-							"-s", "127.0.0.1",
-							"!", "-d", "127.0.0.1",
-						},
-						entryChains: []string{"POSTROUTING"},
-					}))
-				})
-			})
-		})
-	})
-
-	Describe("Forwarding rules", func() {
-		Context("for DNAT", func() {
-			It("generates correct ipv4 rules", func() {
-				rules := dnatRules(mappings, ipv4addr)
-				Expect(rules).To(Equal([][]string{
-					{"-p", "tcp", "--dport", "80", "-j", "DNAT", "--to-destination", "192.2.0.1:90"},
-					{"-p", "udp", "--dport", "1000", "-j", "DNAT", "--to-destination", "192.2.0.1:2000"},
-				}))
-			})
-			It("generates correct ipv6 rules", func() {
-				rules := dnatRules(mappings, ipv6addr)
-				Expect(rules).To(Equal([][]string{
-					{"-p", "tcp", "--dport", "80", "-j", "DNAT", "--to-destination", "[2001:db8::1]:90"},
-					{"-p", "udp", "--dport", "1000", "-j", "DNAT", "--to-destination", "[2001:db8::1]:2000"},
-				}))
-			})
-		})
-
-		Context("for SNAT", func() {
-
-			It("generates correct ipv4 rules", func() {
-				rules := snatRules(mappings, ipv4addr)
-				Expect(rules).To(Equal([][]string{
-					{"-p", "tcp", "-s", "127.0.0.1", "-d", "192.2.0.1", "--dport", "90", "-j", "MASQUERADE"},
-					{"-p", "udp", "-s", "127.0.0.1", "-d", "192.2.0.1", "--dport", "2000", "-j", "MASQUERADE"},
-				}))
-			})
-
-			It("generates correct ipv6 rules", func() {
-				rules := snatRules(mappings, ipv6addr)
-				Expect(rules).To(Equal([][]string{
-					{"-p", "tcp", "-s", "::1", "-d", "2001:db8::1", "--dport", "90", "-j", "MASQUERADE"},
-					{"-p", "udp", "-s", "::1", "-d", "2001:db8::1", "--dport", "2000", "-j", "MASQUERADE"},
+				ch = genMarkMasqChain(masqBit)
+				Expect(ch).To(Equal(chain{
+					table:       "nat",
+					name:        "CNI-HOSTPORT-MASQ",
+					entryChains: []string{"POSTROUTING"},
+					entryRules: [][]string{{
+						"-m", "comment",
+						"--comment", "CNI portfwd requiring masquerade",
+					}},
+					rules: [][]string{{
+						"-m", "mark",
+						"--mark", "0x20/0x20",
+						"-j", "MASQUERADE",
+					}},
 				}))
 			})
 		})

plugins/meta/portmap/utils.go

@@ -18,6 +18,8 @@ import (
 	"crypto/sha512"
 	"fmt"
 	"net"
+	"strconv"
+	"strings"
 
 	"github.com/vishvananda/netlink"
 )
@@ -65,3 +67,51 @@ func formatChainName(prefix, name, id string) string {
 	chain := fmt.Sprintf("CNI-%s%x", prefix, chainBytes)
 	return chain[:maxChainNameLength]
 }
+
+// groupByProto groups port numbers by protocol
+func groupByProto(entries []PortMapEntry) map[string][]int {
+	if len(entries) == 0 {
+		return map[string][]int{}
+	}
+	out := map[string][]int{}
+	for _, e := range entries {
+		_, ok := out[e.Protocol]
+		if ok {
+			out[e.Protocol] = append(out[e.Protocol], e.HostPort)
+		} else {
+			out[e.Protocol] = []int{e.HostPort}
+		}
+	}
+
+	return out
+}
+
+// splitPortList splits a list of integers in to one or more comma-separated
+// string values, for use by multiport. Multiport only allows up to 15 ports
+// per entry.
+func splitPortList(l []int) []string {
+	out := []string{}
+
+	acc := []string{}
+	for _, i := range l {
+		acc = append(acc, strconv.Itoa(i))
+		if len(acc) == 15 {
+			out = append(out, strings.Join(acc, ","))
+			acc = []string{}
+		}
+	}
+
+	if len(acc) > 0 {
+		out = append(out, strings.Join(acc, ","))
+	}
+	return out
+}
+
+// trimComment makes sure no comment is over the iptables limit of 255 chars
+func trimComment(val string) string {
+	if len(val) <= 255 {
+		return val
+	}
+
+	return val[0:253] + "..."
+}

scripts/release.sh

@@ -12,12 +12,14 @@ OUTPUT_DIR=bin
 # Always clean first
 rm -Rf ${SRC_DIR}/${RELEASE_DIR}
 mkdir -p ${SRC_DIR}/${RELEASE_DIR}
+mkdir -p ${OUTPUT_DIR}
 
-docker run -i -v ${SRC_DIR}:/opt/src --rm golang:1.8-alpine \
+docker run -i -v ${SRC_DIR}:/opt/src --rm golang:1.9-alpine \
 /bin/sh -xe -c "\
     apk --no-cache add bash tar;
     cd /opt/src; umask 0022;
     for arch in amd64 arm arm64 ppc64le s390x; do \
+        rm -f ${OUTPUT_DIR}/*; \
         CGO_ENABLED=0 GOARCH=\$arch ./build.sh ${BUILDFLAGS}; \
         for format in tgz; do \
             FILENAME=cni-plugins-\$arch-${TAG}.\$format; \

test.sh

@@ -10,36 +10,36 @@ source ./build.sh
 
 echo "Running tests"
 
-TESTABLE="plugins/ipam/dhcp plugins/ipam/host-local plugins/ipam/host-local/backend/allocator plugins/main/loopback plugins/main/ipvlan plugins/main/macvlan plugins/main/bridge plugins/main/ptp plugins/meta/flannel plugins/main/vlan plugins/sample pkg/ip pkg/ipam pkg/ns pkg/utils pkg/utils/hwaddr pkg/utils/sysctl plugins/meta/portmap"
+# test everything that's not in vendor
+pushd "$GOPATH/src/$REPO_PATH" >/dev/null
+  ALL_PKGS="$(go list ./... | grep -v vendor | xargs echo)"
+popd >/dev/null
+
+GINKGO_FLAGS="-p --randomizeAllSpecs --randomizeSuites --failOnPending --progress"
 
 # user has not provided PKG override
 if [ -z "$PKG" ]; then
-	TEST=$TESTABLE
-	FMT=$TESTABLE
+  GINKGO_FLAGS="$GINKGO_FLAGS -r ."
+  LINT_TARGETS="$ALL_PKGS"
 
 # user has provided PKG override
 else
-	TEST=$PKG
-
-	# only run gofmt on packages provided by user
-	FMT="$TEST"
+  GINKGO_FLAGS="$GINKGO_FLAGS $PKG"
+  LINT_TARGETS="$PKG"
 fi
 
-# split TEST into an array and prepend REPO_PATH to each local package
-split=(${TEST// / })
-TEST=${split[@]/#/${REPO_PATH}/}
-
-sudo -E bash -c "umask 0; PATH=${GOROOT}/bin:$(pwd)/bin:${PATH} go test ${TEST}"
+cd "$GOPATH/src/$REPO_PATH"
+sudo -E bash -c "umask 0; PATH=${GOROOT}/bin:$(pwd)/bin:${PATH} ginkgo ${GINKGO_FLAGS}"
 
 echo "Checking gofmt..."
-fmtRes=$(gofmt -l $FMT)
+fmtRes=$(go fmt $LINT_TARGETS)
 if [ -n "${fmtRes}" ]; then
-	echo -e "gofmt checking failed:\n${fmtRes}"
+	echo -e "go fmt checking failed:\n${fmtRes}"
 	exit 255
 fi
 
 echo "Checking govet..."
-vetRes=$(go vet $TEST)
+vetRes=$(go vet $LINT_TARGETS)
 if [ -n "${vetRes}" ]; then
 	echo -e "govet checking failed:\n${vetRes}"
 	exit 255

vendor/github.com/alexflint/go-filemutex/LICENSE

@@ -0,0 +1,21 @@
+The MIT License
+
+Copyright (c) 2010-2017 Alex Flint.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/github.com/alexflint/go-filemutex/README.md

@@ -0,0 +1,31 @@
+# FileMutex
+
+FileMutex is similar to `sync.RWMutex`, but also synchronizes across processes.
+On Linux, OSX, and other POSIX systems it uses the flock system call. On windows
+it uses the LockFileEx and UnlockFileEx system calls.
+
+```go
+import (
+	"log"
+	"github.com/alexflint/go-filemutex"
+)
+
+func main() {
+	m, err := filemutex.New("/tmp/foo.lock")
+	if err != nil {
+		log.Fatalln("Directory did not exist or file could not created")
+	}
+
+	m.Lock()  // Will block until lock can be acquired
+
+	// Code here is protected by the mutex
+
+	m.Unlock()
+}
+```
+
+### Installation
+
+    go get github.com/alexflint/go-filemutex
+
+Forked from https://github.com/golang/build/tree/master/cmd/builder/filemutex_*.go

vendor/github.com/alexflint/go-filemutex/filemutex_flock.go

@@ -0,0 +1,67 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd linux netbsd openbsd
+
+package filemutex
+
+import (
+	"syscall"
+)
+
+const (
+	mkdirPerm = 0750
+)
+
+// FileMutex is similar to sync.RWMutex, but also synchronizes across processes.
+// This implementation is based on flock syscall.
+type FileMutex struct {
+	fd int
+}
+
+func New(filename string) (*FileMutex, error) {
+	fd, err := syscall.Open(filename, syscall.O_CREAT|syscall.O_RDONLY, mkdirPerm)
+	if err != nil {
+		return nil, err
+	}
+	return &FileMutex{fd: fd}, nil
+}
+
+func (m *FileMutex) Lock() error {
+	if err := syscall.Flock(m.fd, syscall.LOCK_EX); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *FileMutex) Unlock() error {
+	if err := syscall.Flock(m.fd, syscall.LOCK_UN); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *FileMutex) RLock() error {
+	if err := syscall.Flock(m.fd, syscall.LOCK_SH); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *FileMutex) RUnlock() error {
+	if err := syscall.Flock(m.fd, syscall.LOCK_UN); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Close does an Unlock() combined with closing and unlinking the associated
+// lock file. You should create a New() FileMutex for every Lock() attempt if
+// using Close().
+func (m *FileMutex) Close() error {
+	if err := syscall.Flock(m.fd, syscall.LOCK_UN); err != nil {
+		return err
+	}
+	return syscall.Close(m.fd)
+}

vendor/github.com/alexflint/go-filemutex/filemutex_windows.go

@@ -0,0 +1,102 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filemutex
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var (
+	modkernel32      = syscall.NewLazyDLL("kernel32.dll")
+	procLockFileEx   = modkernel32.NewProc("LockFileEx")
+	procUnlockFileEx = modkernel32.NewProc("UnlockFileEx")
+)
+
+const (
+	lockfileExclusiveLock = 2
+)
+
+func lockFileEx(h syscall.Handle, flags, reserved, locklow, lockhigh uint32, ol *syscall.Overlapped) (err error) {
+	r1, _, e1 := syscall.Syscall6(procLockFileEx.Addr(), 6, uintptr(h), uintptr(flags), uintptr(reserved), uintptr(locklow), uintptr(lockhigh), uintptr(unsafe.Pointer(ol)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func unlockFileEx(h syscall.Handle, reserved, locklow, lockhigh uint32, ol *syscall.Overlapped) (err error) {
+	r1, _, e1 := syscall.Syscall6(procUnlockFileEx.Addr(), 5, uintptr(h), uintptr(reserved), uintptr(locklow), uintptr(lockhigh), uintptr(unsafe.Pointer(ol)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+// FileMutex is similar to sync.RWMutex, but also synchronizes across processes.
+// This implementation is based on flock syscall.
+type FileMutex struct {
+	fd syscall.Handle
+}
+
+func New(filename string) (*FileMutex, error) {
+	fd, err := syscall.CreateFile(&(syscall.StringToUTF16(filename)[0]), syscall.GENERIC_READ|syscall.GENERIC_WRITE,
+		syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE, nil, syscall.OPEN_ALWAYS, syscall.FILE_ATTRIBUTE_NORMAL, 0)
+	if err != nil {
+		return nil, err
+	}
+	return &FileMutex{fd: fd}, nil
+}
+
+func (m *FileMutex) Lock() error {
+	var ol syscall.Overlapped
+	if err := lockFileEx(m.fd, lockfileExclusiveLock, 0, 1, 0, &ol); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *FileMutex) Unlock() error {
+	var ol syscall.Overlapped
+	if err := unlockFileEx(m.fd, 0, 1, 0, &ol); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *FileMutex) RLock() error {
+	var ol syscall.Overlapped
+	if err := lockFileEx(m.fd, 0, 0, 1, 0, &ol); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *FileMutex) RUnlock() error {
+	var ol syscall.Overlapped
+	if err := unlockFileEx(m.fd, 0, 1, 0, &ol); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Close does an Unlock() combined with closing and unlinking the associated
+// lock file. You should create a New() FileMutex for every Lock() attempt if
+// using Close().
+func (m *FileMutex) Close() error {
+	var ol syscall.Overlapped
+	if err := unlockFileEx(m.fd, 0, 1, 0, &ol); err != nil {
+		return err
+	}
+	return syscall.Close(m.fd)
+}

vendor/github.com/d2g/dhcp4server/LICENSE

@@ -0,0 +1,354 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. “Contributor”
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. “Contributor Version”
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor’s Contribution.
+
+1.3. “Contribution”
+
+     means Covered Software of a particular Contributor.
+
+1.4. “Covered Software”
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. “Incompatible With Secondary Licenses”
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of version
+        1.1 or earlier of the License, but not also under the terms of a
+        Secondary License.
+
+1.6. “Executable Form”
+
+     means any form of the work other than Source Code Form.
+
+1.7. “Larger Work”
+
+     means a work that combines Covered Software with other material, in a separate
+     file or files, that is not Covered Software.
+
+1.8. “License”
+
+     means this document.
+
+1.9. “Licensable”
+
+     means having the right to grant, to the maximum extent possible, whether at the
+     time of the initial grant or subsequently, any and all of the rights conveyed by
+     this License.
+
+1.10. “Modifications”
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to, deletion
+        from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. “Patent Claims” of a Contributor
+
+      means any patent claim(s), including without limitation, method, process,
+      and apparatus claims, in any patent Licensable by such Contributor that
+      would be infringed, but for the grant of the License, by the making,
+      using, selling, offering for sale, having made, import, or transfer of
+      either its Contributions or its Contributor Version.
+
+1.12. “Secondary License”
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. “Source Code Form”
+
+      means the form of the work preferred for making modifications.
+
+1.14. “You” (or “Your”)
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, “You” includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, “control” means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or as
+        part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its Contributions
+        or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution become
+     effective for each Contribution on the date the Contributor first distributes
+     such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under this
+     License. No additional rights or licenses will be implied from the distribution
+     or licensing of Covered Software under this License. Notwithstanding Section
+     2.1(b) above, no patent license is granted by a Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party’s
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of its
+        Contributions.
+
+     This License does not grant any rights in the trademarks, service marks, or
+     logos of any Contributor (except as may be necessary to comply with the
+     notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this License
+     (see Section 10.2) or under the terms of a Secondary License (if permitted
+     under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its Contributions
+     are its original creation(s) or it has sufficient rights to grant the
+     rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under applicable
+     copyright doctrines of fair use, fair dealing, or other equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under the
+     terms of this License. You must inform recipients that the Source Code Form
+     of the Covered Software is governed by the terms of this License, and how
+     they can obtain a copy of this License. You may not attempt to alter or
+     restrict the recipients’ rights in the Source Code Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this License,
+        or sublicense it under different terms, provided that the license for
+        the Executable Form does not attempt to limit or alter the recipients’
+        rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for the
+     Covered Software. If the Larger Work is a combination of Covered Software
+     with a work governed by one or more Secondary Licenses, and the Covered
+     Software is not Incompatible With Secondary Licenses, this License permits
+     You to additionally distribute such Covered Software under the terms of
+     such Secondary License(s), so that the recipient of the Larger Work may, at
+     their option, further distribute the Covered Software under the terms of
+     either this License or such Secondary License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices (including
+     copyright notices, patent notices, disclaimers of warranty, or limitations
+     of liability) contained within the Source Code Form of the Covered
+     Software, except that You may alter any license notices to the extent
+     required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on behalf
+     of any Contributor. You must make it absolutely clear that any such
+     warranty, support, indemnity, or liability obligation is offered by You
+     alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute, judicial
+   order, or regulation then You must: (a) comply with the terms of this License
+   to the maximum extent possible; and (b) describe the limitations and the code
+   they affect. Such description must be placed in a text file included with all
+   distributions of the Covered Software under this License. Except to the
+   extent prohibited by statute or regulation, such description must be
+   sufficiently detailed for a recipient of ordinary skill to be able to
+   understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
+     if such Contributor fails to notify You of the non-compliance by some
+     reasonable means prior to 60 days after You have come back into compliance.
+     Moreover, Your grants from a particular Contributor are reinstated on an
+     ongoing basis if such Contributor notifies You of the non-compliance by
+     some reasonable means, this is the first time You have received notice of
+     non-compliance with this License from such Contributor, and You become
+     compliant prior to 30 days after Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions, counter-claims,
+     and cross-claims) alleging that a Contributor Version directly or
+     indirectly infringes any patent, then the rights granted to You by any and
+     all Contributors for the Covered Software under Section 2.1 of this License
+     shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an “as is” basis, without
+   warranty of any kind, either expressed, implied, or statutory, including,
+   without limitation, warranties that the Covered Software is free of defects,
+   merchantable, fit for a particular purpose or non-infringing. The entire
+   risk as to the quality and performance of the Covered Software is with You.
+   Should any Covered Software prove defective in any respect, You (not any
+   Contributor) assume the cost of any necessary servicing, repair, or
+   correction. This disclaimer of warranty constitutes an essential part of this
+   License. No use of  any Covered Software is authorized under this License
+   except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from such
+   party’s negligence to the extent applicable law prohibits such limitation.
+   Some jurisdictions do not allow the exclusion or limitation of incidental or
+   consequential damages, so this exclusion and limitation may not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts of
+   a jurisdiction where the defendant maintains its principal place of business
+   and such litigation shall be governed by laws of that jurisdiction, without
+   reference to its conflict-of-law provisions. Nothing in this Section shall
+   prevent a party’s ability to bring cross-claims or counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject matter
+   hereof. If any provision of this License is held to be unenforceable, such
+   provision shall be reformed only to the extent necessary to make it
+   enforceable. Any law or regulation which provides that the language of a
+   contract shall be construed against the drafter shall not be used to construe
+   this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version of
+      the License under which You originally received the Covered Software, or
+      under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a modified
+      version of this License if you rename the license and remove any
+      references to the name of the license steward (except to note that such
+      modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+      If You choose to distribute Source Code Form that is Incompatible With
+      Secondary Licenses under the terms of this version of the License, the
+      notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file, then
+You may include the notice in a location (such as a LICENSE file in a relevant
+directory) where a recipient would be likely to look for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+      This Source Code Form is “Incompatible
+      With Secondary Licenses”, as defined by
+      the Mozilla Public License, v. 2.0.
+

vendor/github.com/d2g/dhcp4server/README.md

@@ -0,0 +1,4 @@
+dhcp4server [![GoDoc](https://godoc.org/github.com/d2g/dhcp4server?status.svg)](http://godoc.org/github.com/d2g/dhcp4server) [![Coverage Status](https://coveralls.io/repos/d2g/dhcp4server/badge.svg)](https://coveralls.io/r/d2g/dhcp4server) [![Codeship Status for d2g/dhcp4server](https://codeship.com/projects/ff96ded0-89cb-0132-8209-4635861fb902/status?branch=master)](https://codeship.com/projects/59804)
+===========
+
+DHCP Server

vendor/github.com/d2g/dhcp4server/leasepool/lease.go

@@ -0,0 +1,95 @@
+package leasepool
+
+import (
+	"encoding/json"
+	"net"
+	"time"
+)
+
+type LeaseStatus int
+
+const (
+	Free     LeaseStatus = 0
+	Reserved LeaseStatus = 1
+	Active   LeaseStatus = 2
+)
+
+type Lease struct {
+	IP         net.IP           //The IP of the Lease
+	Status     LeaseStatus      //Are Reserved, Active or Free
+	MACAddress net.HardwareAddr //Mac Address of the Device
+	Hostname   string           //Hostname From option 12
+	Expiry     time.Time        //Expiry Time
+}
+
+func (this Lease) MarshalJSON() ([]byte, error) {
+	stringMarshal := struct {
+		IP         string
+		Status     int
+		MACAddress string
+		Hostname   string
+		Expiry     time.Time
+	}{
+		(this.IP.String()),
+		int(this.Status),
+		(this.MACAddress.String()),
+		this.Hostname,
+		this.Expiry,
+	}
+
+	return json.Marshal(stringMarshal)
+}
+
+func (this *Lease) UnmarshalJSON(data []byte) error {
+	stringUnMarshal := struct {
+		IP         string
+		Status     int
+		MACAddress string
+		Hostname   string
+		Expiry     time.Time
+	}{}
+
+	err := json.Unmarshal(data, &stringUnMarshal)
+	if err != nil {
+		return err
+	}
+
+	this.IP = net.ParseIP(stringUnMarshal.IP)
+	this.Status = LeaseStatus(stringUnMarshal.Status)
+	if stringUnMarshal.MACAddress != "" {
+		this.MACAddress, err = net.ParseMAC(stringUnMarshal.MACAddress)
+	}
+
+	if err != nil {
+		return err
+	}
+
+	this.Hostname = stringUnMarshal.Hostname
+	this.Expiry = stringUnMarshal.Expiry
+
+	return nil
+}
+
+func (this Lease) Equal(other Lease) bool {
+	if !this.IP.Equal(other.IP) {
+		return false
+	}
+
+	if int(this.Status) != int(other.Status) {
+		return false
+	}
+
+	if this.MACAddress.String() != other.MACAddress.String() {
+		return false
+	}
+
+	if this.Hostname != other.Hostname {
+		return false
+	}
+
+	if !this.Expiry.Equal(other.Expiry) {
+		return false
+	}
+
+	return true
+}

vendor/github.com/d2g/dhcp4server/leasepool/lease_test.go

@@ -0,0 +1,51 @@
+package leasepool
+
+import (
+	"encoding/json"
+	"net"
+	"testing"
+	"time"
+)
+
+/*
+ * The Leases are Marshalled and Unmarshalled for storage.
+ * I JSON Marshal these for gvklite
+ */
+func TestMarshaling(test *testing.T) {
+	var err error
+
+	startLease := Lease{}
+	startLease.IP = net.IPv4(192, 168, 0, 1)
+	startLease.Hostname = "ExampleHostname"
+	startLease.Status = Active
+	startLease.Expiry = time.Now()
+	startLease.MACAddress, err = net.ParseMAC("01:23:45:67:89:ab")
+	if err != nil {
+		test.Error("Error Parsing Mac Address:" + err.Error())
+	}
+
+	byteStartLease, err := json.Marshal(startLease)
+	if err != nil {
+		test.Error("Error Marshaling to JSON:" + err.Error())
+	}
+
+	test.Log("StartLease As JSON:" + string(byteStartLease))
+
+	endLease := Lease{}
+	err = json.Unmarshal(byteStartLease, &endLease)
+	if err != nil {
+		test.Error("Error Unmarshaling to JSON:" + err.Error())
+	}
+
+	test.Logf("End Lease Object:%v\n", endLease)
+
+	if !startLease.Equal(endLease) {
+		byteEndLease, err := json.Marshal(endLease)
+		if err != nil {
+			test.Error("Can't Marshal End Lease For Debuging:" + err.Error())
+		}
+		test.Log("End Lease as JSON:" + string(byteEndLease))
+		test.Error("Starting Lease Doesn't Match End Lease")
+	}
+
+}

vendor/github.com/d2g/dhcp4server/leasepool/leasepool.go

@@ -0,0 +1,49 @@
+package leasepool
+
+import (
+	"net"
+)
+
+/*
+ * Lease.IP is the Key.
+ */
+type LeasePool interface {
+	//Add A Lease To The Pool
+	AddLease(Lease) error
+
+	//Remove
+	RemoveLease(net.IP) error
+
+	//Remove All Leases from the Pool (Required for Persistant LeaseManagers)
+	PurgeLeases() error
+
+	/*
+	 * Get the Lease
+	 * -Found
+	 * -Copy Of the Lease
+	 * -Any Error
+	 */
+	GetLease(net.IP) (bool, Lease, error)
+
+	//Get the lease already in use by that hardware address.
+	GetLeaseForHardwareAddress(net.HardwareAddr) (bool, Lease, error)
+
+	/*
+	 * -Lease Available
+	 * -Lease
+	 * -Error
+	 */
+	GetNextFreeLease() (bool, Lease, error)
+
+	/*
+	 * Return All Leases
+	 */
+	GetLeases() ([]Lease, error)
+
+	/*
+	 * Update Lease
+	 * - Has Updated
+	 * - Error
+	 */
+	UpdateLease(Lease) (bool, error)
+}

vendor/github.com/d2g/dhcp4server/leasepool/memorypool/memorypool.go

@@ -0,0 +1,150 @@
+package memorypool
+
+import (
+	"bytes"
+	"errors"
+	"github.com/d2g/dhcp4server/leasepool"
+	"net"
+	"sync"
+)
+
+type MemoryPool struct {
+	pool     []leasepool.Lease
+	poolLock sync.Mutex
+}
+
+//Add A Lease To The Pool
+func (t *MemoryPool) AddLease(newLease leasepool.Lease) error {
+	t.poolLock.Lock()
+	defer t.poolLock.Unlock()
+
+	if t.pool == nil {
+		t.pool = make([]leasepool.Lease, 0)
+	}
+
+	for i := range t.pool {
+		if t.pool[i].IP.Equal(newLease.IP) {
+			//Lease Already Exists In Pool
+			return errors.New("Error: Lease IP \"" + newLease.IP.String() + "\" alreay exists in Pool")
+		}
+	}
+
+	t.pool = append([]leasepool.Lease{newLease}, t.pool...)
+	return nil
+}
+
+//Remove a Lease From The Pool
+func (t *MemoryPool) RemoveLease(leaseIP net.IP) error {
+	t.poolLock.Lock()
+	defer t.poolLock.Unlock()
+
+	for i := range t.pool {
+		if t.pool[i].IP.Equal(leaseIP) {
+
+			//Move the Last Element to This Position.
+			t.pool[i] = t.pool[len(t.pool)-1]
+
+			//Shortern the Pool By One.
+			t.pool = t.pool[0:(len(t.pool) - 1)]
+			return nil
+		}
+	}
+
+	return errors.New("Error: Lease IP \"" + leaseIP.String() + "\" Is Not In The Pool")
+}
+
+//Remove All Leases from the Pool (Required for Persistant LeaseManagers)
+func (t *MemoryPool) PurgeLeases() error {
+	t.poolLock.Lock()
+	defer t.poolLock.Unlock()
+
+	t.pool = nil
+	t.pool = make([]leasepool.Lease, 0)
+	return nil
+}
+
+/*
+ * Get the Lease
+ * -Found
+ * -Copy Of the Lease
+ * -Any Error
+ */
+func (t *MemoryPool) GetLease(leaseIP net.IP) (bool, leasepool.Lease, error) {
+	t.poolLock.Lock()
+	defer t.poolLock.Unlock()
+
+	for i := range t.pool {
+		if t.pool[i].IP.Equal(leaseIP) {
+			return true, t.pool[i], nil
+		}
+	}
+	return false, leasepool.Lease{}, nil
+}
+
+//Get the lease already in use by that hardware address.
+func (t *MemoryPool) GetLeaseForHardwareAddress(macAddress net.HardwareAddr) (bool, leasepool.Lease, error) {
+	t.poolLock.Lock()
+	defer t.poolLock.Unlock()
+
+	for i := range t.pool {
+		if bytes.Equal(t.pool[i].MACAddress, macAddress) {
+			return true, t.pool[i], nil
+		}
+	}
+	return false, leasepool.Lease{}, nil
+}
+
+/*
+ * -Lease Available
+ * -Lease
+ * -Error
+ */
+func (t *MemoryPool) GetNextFreeLease() (bool, leasepool.Lease, error) {
+	t.poolLock.Lock()
+	defer t.poolLock.Unlock()
+
+	//Loop Through the elements backwards.
+	for i := (len(t.pool) - 1); i >= 0; i-- {
+		//If the Lease Is Free
+		if t.pool[i].Status == leasepool.Free {
+			//Take the Element
+			iLease := t.pool[i]
+			//Shrink the Pool By 1
+			t.pool = t.pool[:(len(t.pool) - 1)]
+			//Place the Lease At the Begining (This saves us having some sort of counter...)
+			t.pool = append([]leasepool.Lease{iLease}, t.pool...)
+			return true, iLease, nil
+		}
+	}
+	return false, leasepool.Lease{}, nil
+}
+
+/*
+ * Return All Leases
+ */
+func (t *MemoryPool) GetLeases() ([]leasepool.Lease, error) {
+	return t.pool, nil
+}
+
+/*
+ * Update Lease
+ * - Has Updated
+ * - Error
+ */
+func (t *MemoryPool) UpdateLease(lease leasepool.Lease) (bool, error) {
+	t.poolLock.Lock()
+	defer t.poolLock.Unlock()
+
+	for i := range t.pool {
+		if t.pool[i].IP.Equal(lease.IP) {
+
+			t.pool[i].MACAddress = lease.MACAddress
+			t.pool[i].Hostname = lease.Hostname
+			t.pool[i].Expiry = lease.Expiry
+			t.pool[i].Status = lease.Status
+
+			return true, nil
+		}
+	}
+	return false, nil
+}

vendor/github.com/d2g/dhcp4server/leasepool/memorypool/memorypool_test.go

@@ -0,0 +1,51 @@
+package memorypool
+
+import (
+	"github.com/d2g/dhcp4"
+	"github.com/d2g/dhcp4server/leasepool"
+	"net"
+	"testing"
+)
+
+func TestLeaseCycle(test *testing.T) {
+	myMemoryLeasePool := MemoryPool{}
+
+	//Lets add a list of IPs to the pool these will be served to the clients so make sure they work for you.
+	// So Create Array of IPs 192.168.1.1 to 192.168.1.30
+	for i := 0; i < 30; i++ {
+		err := myMemoryLeasePool.AddLease(leasepool.Lease{IP: dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i)})
+		if err != nil {
+			test.Error("Error Creating Lease:" + err.Error())
+		}
+	}
+
+	for i := 0; i < 30; i++ {
+		hasLease, iLease, err := myMemoryLeasePool.GetNextFreeLease()
+		if err != nil || !hasLease {
+			test.Error("Error Getting Lease:" + err.Error())
+		}
+
+		if !dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i).Equal(iLease.IP) {
+			test.Error("Expected Lease:" + dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i).String() + " Received:" + iLease.IP.String())
+		}
+	}
+}
+
+func TestSingleLease(test *testing.T) {
+	myMemoryLeasePool := MemoryPool{}
+
+	err := myMemoryLeasePool.AddLease(leasepool.Lease{IP: dhcp4.IPAdd(net.IPv4(192, 168, 1, 5), 0)})
+	if err != nil {
+		test.Error("Error Creating Lease:" + err.Error())
+	}
+
+	hasLease, iLease, err := myMemoryLeasePool.GetNextFreeLease()
+	if err != nil || !hasLease {
+		test.Error("Error Getting Lease:" + err.Error())
+	}
+
+	if !dhcp4.IPAdd(net.IPv4(192, 168, 1, 5), 0).Equal(iLease.IP) {
+		test.Error("Expected Lease:" + dhcp4.IPAdd(net.IPv4(192, 168, 1, 5), 0).String() + " Received:" + iLease.IP.String())
+	}
+}
+

vendor/github.com/d2g/dhcp4server/server.go

@@ -0,0 +1,572 @@
+package dhcp4server
+
+import (
+	"bytes"
+	"errors"
+	"log"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/d2g/dhcp4"
+	"github.com/d2g/dhcp4server/leasepool"
+
+	"golang.org/x/net/ipv4"
+)
+
+/*
+ * The DHCP Server Structure
+ */
+type Server struct {
+	//Configuration Options
+	ip                    net.IP             //The IP Address We Tell Clients The Server Is On.
+	defaultGateway        net.IP             //The Default Gateway Address
+	dnsServers            []net.IP           //DNS Servers
+	subnetMask            net.IP             //ie. 255.255.255.0
+	leaseDuration         time.Duration      //Number of Seconds
+	ignoreIPs             []net.IP           //Slice of IP's that should be ignored by the Server.
+	ignoreHardwareAddress []net.HardwareAddr //Slice of Hardware Addresses we should ignore.
+
+	//Local Address
+	laddr net.UDPAddr
+
+	//Remote address
+	raddr net.UDPAddr
+
+	//LeasePool
+	leasePool leasepool.LeasePool //Lease Pool Manager
+
+	//Used to Gracefully Close the Server
+	shutdownLock sync.Mutex
+	shutdown     bool
+	//Listeners & Response Connection.
+	connection *ipv4.PacketConn
+}
+
+// Create A New Server
+func New(ip net.IP, l leasepool.LeasePool, options ...func(*Server) error) (*Server, error) {
+	s := Server{
+		ip:             ip,
+		defaultGateway: ip,
+		dnsServers:     []net.IP{net.IPv4(208, 67, 222, 222), net.IPv4(208, 67, 220, 220)}, //OPENDNS
+		subnetMask:     net.IPv4(255, 255, 255, 0),
+		leaseDuration:  24 * time.Hour,
+		leasePool:      l,
+		laddr:          net.UDPAddr{IP: net.IPv4(0, 0, 0, 0), Port: 67},
+		raddr:          net.UDPAddr{IP: net.IPv4bcast, Port: 68},
+	}
+
+	err := s.setOptions(options...)
+	if err != nil {
+		return &s, err
+	}
+
+	return &s, err
+}
+
+func (s *Server) setOptions(options ...func(*Server) error) error {
+	for _, opt := range options {
+		if err := opt(s); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Set the Server IP
+func IP(i net.IP) func(*Server) error {
+	return func(s *Server) error {
+		s.ip = i
+		return nil
+	}
+	return nil
+}
+
+// Set the Default Gateway Address.
+func DefaultGateway(r net.IP) func(*Server) error {
+	return func(s *Server) error {
+		s.defaultGateway = r
+		return nil
+	}
+}
+
+// Set the DNS servers.
+func DNSServers(dnss []net.IP) func(*Server) error {
+	return func(s *Server) error {
+		s.dnsServers = dnss
+		return nil
+	}
+}
+
+// Set the Subnet Mask
+func SubnetMask(m net.IP) func(*Server) error {
+	return func(s *Server) error {
+		s.subnetMask = m
+		return nil
+	}
+}
+
+// Set Lease Duration
+func LeaseDuration(d time.Duration) func(*Server) error {
+	return func(s *Server) error {
+		s.leaseDuration = d
+		return nil
+	}
+}
+
+// Set Ignore IPs
+func IgnoreIPs(ips []net.IP) func(*Server) error {
+	return func(s *Server) error {
+		s.ignoreIPs = ips
+		return nil
+	}
+}
+
+// Set Ignore Hardware Addresses
+func IgnoreHardwareAddresses(h []net.HardwareAddr) func(*Server) error {
+	return func(s *Server) error {
+		s.ignoreHardwareAddress = h
+		return nil
+	}
+}
+
+// Set LeasePool
+func LeasePool(p leasepool.LeasePool) func(*Server) error {
+	return func(s *Server) error {
+		s.leasePool = p
+		return nil
+	}
+}
+
+// Set The Local Address
+func SetLocalAddr(a net.UDPAddr) func(*Server) error {
+	return func(s *Server) error {
+		s.laddr = a
+		return nil
+	}
+}
+
+// Set The Remote Address
+func SetRemoteAddr(a net.UDPAddr) func(*Server) error {
+	return func(s *Server) error {
+		s.raddr = a
+		return nil
+	}
+}
+
+func (s *Server) shouldShutdown() bool {
+	s.shutdownLock.Lock()
+	defer s.shutdownLock.Unlock()
+	return s.shutdown
+}
+
+/*
+ * Start The DHCP Server
+ */
+func (s *Server) ListenAndServe() error {
+	var err error
+
+	connection, err := net.ListenPacket("udp4", s.laddr.String())
+	if err != nil {
+		log.Printf("Debug: Error Returned From ListenPacket On \"%s\" Because of \"%s\"\n", s.laddr.String(), err.Error())
+		return err
+	}
+	s.connection = ipv4.NewPacketConn(connection)
+	defer s.connection.Close()
+
+	//We Currently Don't Use this Feature Which is the only bit that is Linux Only.
+	//if err := s.connection.SetControlMessage(ipv4.FlagInterface, true); err != nil {
+	//	return err
+	//}
+
+	//Make Our Buffer (Max Buffer is 574) "I believe this 576 size comes from RFC 791" - Random Mailing list quote of the day.
+	buffer := make([]byte, 576)
+
+	log.Println("Trace: DHCP Server Listening.")
+
+	for {
+	ListenForDHCPPackets:
+		if s.shouldShutdown() {
+			return nil
+		}
+
+		//Set Read Deadline
+		s.connection.SetReadDeadline(time.Now().Add(time.Second))
+		// Read Packet
+		n, control_message, source, err := s.connection.ReadFrom(buffer)
+
+		if err != nil {
+
+			switch v := err.(type) {
+			case *net.OpError:
+				if v.Timeout() {
+					goto ListenForDHCPPackets
+				}
+			case *net.AddrError:
+				if v.Timeout() {
+					goto ListenForDHCPPackets
+				}
+			case *net.UnknownNetworkError:
+				if v.Timeout() {
+					goto ListenForDHCPPackets
+				}
+			}
+
+			log.Println("Debug: Unexpect Error from Connection Read From:" + err.Error())
+			return err
+		}
+
+		//We seem to have an issue with undersized packets?
+		if n < 240 {
+			log.Printf("Error: Invalid Packet Size \"%d\" Received:%v\n", n, buffer[:n])
+			continue
+		}
+
+		//We should ignore some requests
+		//It shouldn't be possible to ignore IP's because they shouldn't have them as we're the DHCP server.
+		//However, they can have i.e. if you're the client & server :S.
+		for _, ipToIgnore := range s.ignoreIPs {
+			if ipToIgnore.Equal(source.(*net.UDPAddr).IP) {
+				log.Println("Debug: Ignoring DHCP Request From IP:" + ipToIgnore.String())
+				continue
+			}
+		}
+
+		packet := dhcp4.Packet(buffer[:n])
+
+		//We can ignore hardware addresses.
+		//Usefull for ignoring a range of hardware addresses
+		for _, hardwareAddressToIgnore := range s.ignoreHardwareAddress {
+			if bytes.Equal(hardwareAddressToIgnore, packet.CHAddr()) {
+				log.Println("Debug: Ignoring DHCP Request From Hardware Address:" + hardwareAddressToIgnore.String())
+				continue
+			}
+		}
+
+		log.Printf("Trace: Packet Received ID:%v\n", packet.XId())
+		log.Printf("Trace: Packet Options:%v\n", packet.ParseOptions())
+		log.Printf("Trace: Packet Client IP : %v\n", packet.CIAddr().String())
+		log.Printf("Trace: Packet Your IP   : %v\n", packet.YIAddr().String())
+		log.Printf("Trace: Packet Server IP : %v\n", packet.SIAddr().String())
+		log.Printf("Trace: Packet Gateway IP: %v\n", packet.GIAddr().String())
+		log.Printf("Trace: Packet Client Mac: %v\n", packet.CHAddr().String())
+
+		//We need to stop butting in with other servers.
+		if packet.SIAddr().Equal(net.IPv4(0, 0, 0, 0)) || packet.SIAddr().Equal(net.IP{}) || packet.SIAddr().Equal(s.ip) {
+
+			returnPacket, err := s.ServeDHCP(packet)
+			if err != nil {
+				log.Println("Debug: Error Serving DHCP:" + err.Error())
+				return err
+			}
+
+			if len(returnPacket) > 0 {
+				log.Printf("Trace: Packet Returned ID:%v\n", returnPacket.XId())
+				log.Printf("Trace: Packet Options:%v\n", returnPacket.ParseOptions())
+				log.Printf("Trace: Packet Client IP : %v\n", returnPacket.CIAddr().String())
+				log.Printf("Trace: Packet Your IP   : %v\n", returnPacket.YIAddr().String())
+				log.Printf("Trace: Packet Server IP : %v\n", returnPacket.SIAddr().String())
+				log.Printf("Trace: Packet Gateway IP: %v\n", returnPacket.GIAddr().String())
+				log.Printf("Trace: Packet Client Mac: %v\n", returnPacket.CHAddr().String())
+
+				_, err = s.connection.WriteTo(returnPacket, control_message, &s.raddr)
+				if err != nil {
+					log.Println("Debug: Error Writing:" + err.Error())
+					return err
+				}
+			}
+		}
+
+	}
+}
+
+func (s *Server) ServeDHCP(packet dhcp4.Packet) (dhcp4.Packet, error) {
+	packetOptions := packet.ParseOptions()
+
+	switch dhcp4.MessageType(packetOptions[dhcp4.OptionDHCPMessageType][0]) {
+	case dhcp4.Discover:
+
+		//Discover Received from client
+		//Lets get the lease we're going to send them
+		found, lease, err := s.GetLease(packet)
+		if err != nil {
+			return dhcp4.Packet{}, err
+		}
+
+		if !found {
+			log.Println("Warning: It Looks Like Our Leases Are Depleted...")
+			return dhcp4.Packet{}, nil
+		}
+
+		offerPacket := s.OfferPacket(packet)
+		offerPacket.SetYIAddr(lease.IP)
+
+		//Sort out the packet options
+		offerPacket.PadToMinSize()
+
+		lease.Status = leasepool.Reserved
+		lease.MACAddress = packet.CHAddr()
+
+		//If the lease expires within the next 5 Mins increase the lease expiary (Giving the Client 5 mins to complete)
+		if lease.Expiry.Before(time.Now().Add(time.Minute * 5)) {
+			lease.Expiry = time.Now().Add(time.Minute * 5)
+		}
+
+		if packetOptions[dhcp4.OptionHostName] != nil && string(packetOptions[dhcp4.OptionHostName]) != "" {
+			lease.Hostname = string(packetOptions[dhcp4.OptionHostName])
+		}
+
+		updated, err := s.leasePool.UpdateLease(lease)
+		if err != nil {
+			return dhcp4.Packet{}, err
+		}
+
+		if !updated {
+			//Unable to reserve lease (It's now active else where maybe?)
+			return dhcp4.Packet{}, errors.New("Unable to Reserve Lease:" + lease.IP.String())
+		}
+
+		return offerPacket, nil
+	case dhcp4.Request:
+		//Request Received from client
+		//Lets get the lease we're going to send them
+		found, lease, err := s.GetLease(packet)
+		if err != nil {
+			return dhcp4.Packet{}, err
+		}
+
+		if !found {
+			log.Println("Warning: It Looks Like Our Leases Are Depleted...")
+			return dhcp4.Packet{}, nil
+		}
+
+		//If the lease is not the one requested We should send a NAK..
+		if len(packetOptions) > 0 && !net.IP(packetOptions[dhcp4.OptionRequestedIPAddress]).Equal(lease.IP) {
+			//NAK
+			declinePacket := s.DeclinePacket(packet)
+			declinePacket.PadToMinSize()
+
+			return declinePacket, nil
+		} else {
+			lease.Status = leasepool.Active
+			lease.MACAddress = packet.CHAddr()
+
+			lease.Expiry = time.Now().Add(s.leaseDuration)
+
+			if packetOptions[dhcp4.OptionHostName] != nil && string(packetOptions[dhcp4.OptionHostName]) != "" {
+				lease.Hostname = string(packetOptions[dhcp4.OptionHostName])
+			}
+
+			updated, err := s.leasePool.UpdateLease(lease)
+			if err != nil {
+				return dhcp4.Packet{}, err
+			}
+
+			if updated {
+				//ACK
+				acknowledgementPacket := s.AcknowledgementPacket(packet)
+				acknowledgementPacket.SetYIAddr(lease.IP)
+
+				//Lease time.
+				acknowledgementPacket.AddOption(dhcp4.OptionIPAddressLeaseTime, dhcp4.OptionsLeaseTime(lease.Expiry.Sub(time.Now())))
+				acknowledgementPacket.PadToMinSize()
+
+				return acknowledgementPacket, nil
+			} else {
+				//NAK
+				declinePacket := s.DeclinePacket(packet)
+				declinePacket.PadToMinSize()
+
+				return declinePacket, nil
+			}
+		}
+	case dhcp4.Decline:
+		//Decline from the client:
+		log.Printf("Debug: Decline Message:%v\n", packet)
+
+	case dhcp4.Release:
+		//Decline from the client:
+		log.Printf("Debug: Release Message:%v\n", packet)
+
+	default:
+		log.Printf("Debug: Unexpected Packet Type:%v\n", dhcp4.MessageType(packetOptions[dhcp4.OptionDHCPMessageType][0]))
+	}
+
+	return dhcp4.Packet{}, nil
+}
+
+/*
+ * Create DHCP Offer Packet
+ */
+func (s *Server) OfferPacket(discoverPacket dhcp4.Packet) dhcp4.Packet {
+
+	offerPacket := dhcp4.NewPacket(dhcp4.BootReply)
+	offerPacket.SetXId(discoverPacket.XId())
+	offerPacket.SetFlags(discoverPacket.Flags())
+
+	offerPacket.SetCHAddr(discoverPacket.CHAddr())
+	offerPacket.SetGIAddr(discoverPacket.GIAddr())
+	offerPacket.SetSecs(discoverPacket.Secs())
+
+	//53
+	offerPacket.AddOption(dhcp4.OptionDHCPMessageType, []byte{byte(dhcp4.Offer)})
+	//54
+	offerPacket.AddOption(dhcp4.OptionServerIdentifier, s.ip.To4())
+	//51
+	offerPacket.AddOption(dhcp4.OptionIPAddressLeaseTime, dhcp4.OptionsLeaseTime(s.leaseDuration))
+
+	//Other options go in requested order...
+	discoverPacketOptions := discoverPacket.ParseOptions()
+
+	ourOptions := make(dhcp4.Options)
+
+	//1
+	ourOptions[dhcp4.OptionSubnetMask] = s.subnetMask.To4()
+	//3
+	ourOptions[dhcp4.OptionRouter] = s.defaultGateway.To4()
+	//6
+	ourOptions[dhcp4.OptionDomainNameServer] = dhcp4.JoinIPs(s.dnsServers)
+
+	if discoverPacketOptions[dhcp4.OptionParameterRequestList] != nil {
+		//Loop through the requested options and if we have them add them.
+		for _, optionCode := range discoverPacketOptions[dhcp4.OptionParameterRequestList] {
+			if !bytes.Equal(ourOptions[dhcp4.OptionCode(optionCode)], []byte{}) {
+				offerPacket.AddOption(dhcp4.OptionCode(optionCode), ourOptions[dhcp4.OptionCode(optionCode)])
+				delete(ourOptions, dhcp4.OptionCode(optionCode))
+			}
+		}
+	}
+
+	//Add all the options not requested.
+	for optionCode, optionValue := range ourOptions {
+		offerPacket.AddOption(optionCode, optionValue)
+	}
+
+	return offerPacket
+
+}
+
+/*
+ * Create DHCP Acknowledgement
+ */
+func (s *Server) AcknowledgementPacket(requestPacket dhcp4.Packet) dhcp4.Packet {
+
+	acknowledgementPacket := dhcp4.NewPacket(dhcp4.BootReply)
+	acknowledgementPacket.SetXId(requestPacket.XId())
+	acknowledgementPacket.SetFlags(requestPacket.Flags())
+
+	acknowledgementPacket.SetGIAddr(requestPacket.GIAddr())
+	acknowledgementPacket.SetCHAddr(requestPacket.CHAddr())
+	acknowledgementPacket.SetSecs(requestPacket.Secs())
+
+	acknowledgementPacket.AddOption(dhcp4.OptionDHCPMessageType, []byte{byte(dhcp4.ACK)})
+	acknowledgementPacket.AddOption(dhcp4.OptionSubnetMask, s.subnetMask.To4())
+	acknowledgementPacket.AddOption(dhcp4.OptionRouter, s.defaultGateway.To4())
+	acknowledgementPacket.AddOption(dhcp4.OptionDomainNameServer, dhcp4.JoinIPs(s.dnsServers))
+	acknowledgementPacket.AddOption(dhcp4.OptionServerIdentifier, s.ip.To4())
+
+	return acknowledgementPacket
+}
+
+/*
+ * Create DHCP Decline
+ */
+func (s *Server) DeclinePacket(requestPacket dhcp4.Packet) dhcp4.Packet {
+
+	declinePacket := dhcp4.NewPacket(dhcp4.BootReply)
+	declinePacket.SetXId(requestPacket.XId())
+	declinePacket.SetFlags(requestPacket.Flags())
+
+	declinePacket.SetGIAddr(requestPacket.GIAddr())
+	declinePacket.SetCHAddr(requestPacket.CHAddr())
+	declinePacket.SetSecs(requestPacket.Secs())
+
+	declinePacket.AddOption(dhcp4.OptionDHCPMessageType, []byte{byte(dhcp4.NAK)})
+	declinePacket.AddOption(dhcp4.OptionSubnetMask, s.subnetMask.To4())
+	declinePacket.AddOption(dhcp4.OptionRouter, s.defaultGateway.To4())
+	declinePacket.AddOption(dhcp4.OptionDomainNameServer, dhcp4.JoinIPs(s.dnsServers))
+	declinePacket.AddOption(dhcp4.OptionServerIdentifier, s.ip.To4())
+
+	return declinePacket
+}
+
+/*
+ * Get Lease tries to work out the best lease for the packet supplied.
+ * Taking into account all Requested IP, Exisitng MACAddresses and Free leases.
+ */
+func (s *Server) GetLease(packet dhcp4.Packet) (found bool, lease leasepool.Lease, err error) {
+	packetOptions := packet.ParseOptions()
+
+	//Requested an IP
+	if (len(packetOptions) > 0) &&
+		packetOptions[dhcp4.OptionRequestedIPAddress] != nil &&
+		!net.IP(packetOptions[dhcp4.OptionRequestedIPAddress]).Equal(net.IP{}) {
+		//An IP Has Been Requested Let's Try and Get that One.
+
+		found, lease, err = s.leasePool.GetLease(net.IP(packetOptions[dhcp4.OptionRequestedIPAddress]))
+		if err != nil {
+			return
+		}
+
+		if found {
+			if lease.Status == leasepool.Free {
+				//Lease Is Free you Can Have it.
+				return
+			}
+			if lease.Status != leasepool.Free && bytes.Equal(lease.MACAddress, packet.CHAddr()) {
+				//Lease isn't free but it's yours
+				return
+			}
+		}
+	}
+
+	//Ok Even if you requested an IP you can't have it.
+	found, lease, err = s.leasePool.GetLeaseForHardwareAddress(packet.CHAddr())
+	if found || err != nil {
+		return
+	}
+
+	//Just get the next free lease if you can.
+	found, lease, err = s.leasePool.GetNextFreeLease()
+	return
+}
+
+/*
+ * Shutdown The Server Gracefully
+ */
+func (s *Server) Shutdown() {
+	s.shutdownLock.Lock()
+	defer s.shutdownLock.Unlock()
+	s.shutdown = true
+}
+
+/*
+ * Garbage Collection
+ * Run Garbage Collection On Your Leases To Free Expired Leases.
+ */
+func (s *Server) GC() error {
+	leases, err := s.leasePool.GetLeases()
+	if err != nil {
+		return err
+	}
+
+	for i := range leases {
+		if leases[i].Status != leasepool.Free {
+			//Lease Is Not Free
+
+			if time.Now().After(leases[i].Expiry) {
+				//Lease has expired.
+				leases[i].Status = leasepool.Free
+				updated, err := s.leasePool.UpdateLease(leases[i])
+				if err != nil {
+					log.Printf("Warning: Error trying to Free Lease %s \"%v\"\n", leases[i].IP.To4().String(), err)
+				}
+				if !updated {
+					log.Printf("Warning: Unable to Free Lease %s\n", leases[i].IP.To4().String())
+				}
+				continue
+			}
+		}
+	}
+	return nil
+}

vendor/github.com/d2g/dhcp4server/server_test.go

@@ -0,0 +1,426 @@
+package dhcp4server_test
+
+import (
+	"bytes"
+	"encoding/binary"
+	"log"
+	"net"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/d2g/dhcp4"
+	"github.com/d2g/dhcp4client"
+	"github.com/d2g/dhcp4server"
+	"github.com/d2g/dhcp4server/leasepool"
+	"github.com/d2g/dhcp4server/leasepool/memorypool"
+	"github.com/d2g/hardwareaddr"
+)
+
+/*
+ * Example Server :D
+ */
+func ExampleServer() {
+
+	//Create a Lease Pool We're going to use a memory pool
+	//Remember the memory is cleared on restart so you will reissue the same IP Addresses.
+	myMemoryLeasePool := memorypool.MemoryPool{}
+
+	//Lets add a list of IPs to the pool these will be served to the clients so make sure they work for you.
+	// So Create Array of IPs 192.168.1.1 to 192.168.1.30
+	for i := 0; i < 30; i++ {
+		err := myMemoryLeasePool.AddLease(leasepool.Lease{IP: dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i)})
+		if err != nil {
+			log.Fatalln("Error Adding IP to pool:" + err.Error())
+		}
+	}
+
+	// We set the port numbers to over 1024 (1067 & 1068) as the automated test don't have root access
+	tServer, err := dhcp4server.New(
+		net.IPv4(192, 168, 1, 201),
+		&myMemoryLeasePool,
+		dhcp4server.SetLocalAddr(net.UDPAddr{IP: net.IPv4(0, 0, 0, 0), Port: 1067}),
+		dhcp4server.SetRemoteAddr(net.UDPAddr{IP: net.IPv4bcast, Port: 1068}),
+	)
+	if err != nil {
+		log.Fatalln("Error Configuring Server:" + err.Error())
+	}
+
+	//Start the Server...
+	err = tServer.ListenAndServe()
+	if err != nil {
+		log.Fatalln("Error Starting Server:" + err.Error())
+	}
+}
+
+/*
+ * Test Discovering a Lease That's not Within Our Lease Range.
+ * This Happens When a devce switches network.
+ * Example: Mobile Phone on Mobile internet Has IP 100.123.123.123 Switch To Home Wifi
+ * The device requests 100.123.123.123 on Home Wifi which is out of range...
+ */
+func TestDiscoverOutOfRangeLease(test *testing.T) {
+	//Setup the Server
+	myServer, err := dhcp4server.New(
+		net.IPv4(192, 168, 1, 201),
+		getTestLeasePool(),
+		dhcp4server.SetLocalAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1067}),
+		dhcp4server.SetRemoteAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1068}),
+	)
+	if err != nil {
+		test.Error("Error: Can't Configure Server " + err.Error())
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+
+		err := myServer.ListenAndServe()
+		if err != nil {
+			log.Fatalln("Error Starting Server:" + err.Error())
+		}
+	}()
+
+	time.Sleep(time.Duration(5) * time.Second)
+
+	//Generate Hardware Address
+	HardwareMACAddress, err := hardwareaddr.GenerateEUI48()
+	if err != nil {
+		test.Error("Error: Can't Generate Valid MACAddress" + err.Error())
+	}
+
+	//Lets Be A Client
+
+	//We need to set the connection ports to 1068 and 1067 so we don't need root access
+	c, err := dhcp4client.NewInetSock(dhcp4client.SetLocalAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1068}), dhcp4client.SetRemoteAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1067}))
+	if err != nil {
+		test.Error("Client Conection Generation:" + err.Error())
+	}
+
+	client, err := dhcp4client.New(dhcp4client.HardwareAddr(HardwareMACAddress), dhcp4client.Connection(c))
+	defer client.Close()
+	if err != nil {
+		test.Error("Conection Error:" + err.Error())
+	}
+
+	discoveryPacket := client.DiscoverPacket()
+	discoveryPacket.SetCIAddr(net.IPv4(100, 102, 96, 123))
+	discoveryPacket.PadToMinSize()
+
+	err = client.SendPacket(discoveryPacket)
+	if err != nil {
+		test.Error("Error: Sending Discover Packet" + err.Error())
+	}
+
+	test.Log("--Discovery Packet--")
+	test.Logf("Client IP : %v\n", discoveryPacket.CIAddr().String())
+	test.Logf("Your IP   : %v\n", discoveryPacket.YIAddr().String())
+	test.Logf("Server IP : %v\n", discoveryPacket.SIAddr().String())
+	test.Logf("Gateway IP: %v\n", discoveryPacket.GIAddr().String())
+	test.Logf("Client Mac: %v\n", discoveryPacket.CHAddr().String())
+
+	if !bytes.Equal(discoveryPacket.CHAddr(), HardwareMACAddress) {
+		test.Error("MACAddresses Don't Match??")
+	}
+
+	offerPacket, err := client.GetOffer(&discoveryPacket)
+	if err != nil {
+		test.Error("Error Getting Offer:" + err.Error())
+	}
+
+	test.Log("--Offer Packet--")
+	test.Logf("Client IP : %v\n", offerPacket.CIAddr().String())
+	test.Logf("Your IP   : %v\n", offerPacket.YIAddr().String())
+	test.Logf("Server IP : %v\n", offerPacket.SIAddr().String())
+	test.Logf("Gateway IP: %v\n", offerPacket.GIAddr().String())
+	test.Logf("Client Mac: %v\n", offerPacket.CHAddr().String())
+
+	requestPacket, err := client.SendRequest(&offerPacket)
+	if err != nil {
+		test.Error("Error Sending Request:" + err.Error())
+	}
+
+	test.Log("--Request Packet--")
+	test.Logf("Client IP : %v\n", requestPacket.CIAddr().String())
+	test.Logf("Your IP   : %v\n", requestPacket.YIAddr().String())
+	test.Logf("Server IP : %v\n", requestPacket.SIAddr().String())
+	test.Logf("Gateway IP: %v\n", requestPacket.GIAddr().String())
+	test.Logf("Client Mac: %v\n", requestPacket.CHAddr().String())
+
+	acknowledgement, err := client.GetAcknowledgement(&requestPacket)
+	if err != nil {
+		test.Error("Error Getting Acknowledgement:" + err.Error())
+	}
+
+	test.Log("--Acknowledgement Packet--")
+	test.Logf("Client IP : %v\n", acknowledgement.CIAddr().String())
+	test.Logf("Your IP   : %v\n", acknowledgement.YIAddr().String())
+	test.Logf("Server IP : %v\n", acknowledgement.SIAddr().String())
+	test.Logf("Gateway IP: %v\n", acknowledgement.GIAddr().String())
+	test.Logf("Client Mac: %v\n", acknowledgement.CHAddr().String())
+
+	acknowledgementOptions := acknowledgement.ParseOptions()
+	if dhcp4.MessageType(acknowledgementOptions[dhcp4.OptionDHCPMessageType][0]) != dhcp4.ACK {
+		test.Error("Didn't get ACK?:" + err.Error())
+	}
+
+	test.Log("Shutting Down Server")
+	myServer.Shutdown()
+	wg.Wait()
+}
+
+/*
+ * Try Renewing A Lease From A Different Network.
+ */
+func TestRequestOutOfRangeLease(test *testing.T) {
+	//Setup the Server
+	myServer, err := dhcp4server.New(
+		net.IPv4(192, 168, 1, 201),
+		getTestLeasePool(),
+		dhcp4server.SetLocalAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1067}),
+		dhcp4server.SetRemoteAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1068}),
+	)
+	if err != nil {
+		test.Error("Error: Can't Configure Server " + err.Error())
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+
+		err := myServer.ListenAndServe()
+		if err != nil {
+			log.Fatalln("Error Starting Server:" + err.Error())
+		}
+	}()
+
+	//Sleep some so the server starts....
+	time.Sleep(time.Duration(5) * time.Second)
+
+	//Generate Hardware Address
+	HardwareMACAddress, err := hardwareaddr.GenerateEUI48()
+	if err != nil {
+		test.Error("Error: Can't Generate Valid MACAddress" + err.Error())
+	}
+
+	HardwareMACAddress, err = net.ParseMAC("58-94-6B-73-57-0C")
+	if err != nil {
+		log.Printf("MAC Error:%v\n", err)
+	}
+
+	//Lets Be A Client
+	c, err := dhcp4client.NewInetSock(dhcp4client.SetLocalAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1068}), dhcp4client.SetRemoteAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1067}))
+	if err != nil {
+		test.Error("Client Conection Generation:" + err.Error())
+	}
+
+	client, err := dhcp4client.New(dhcp4client.HardwareAddr(HardwareMACAddress), dhcp4client.Connection(c))
+	defer client.Close()
+
+	if err != nil {
+		test.Error("Conection Error:" + err.Error())
+	}
+
+	//Create a dummy offer packet
+	offerPacket := client.DiscoverPacket()
+
+	offerPacket.SetCIAddr(net.IPv4(100, 102, 96, 123))
+	offerPacket.SetSIAddr(net.IPv4(192, 168, 1, 201))
+	offerPacket.SetYIAddr(net.IPv4(100, 102, 96, 123))
+	offerPacket.AddOption(dhcp4.OptionDHCPMessageType, []byte{byte(dhcp4.Offer)})
+
+	requestPacket, err := client.SendRequest(&offerPacket)
+	if err != nil {
+		test.Error("Error Sending Request:" + err.Error())
+	}
+
+	test.Log("--Request Packet--")
+	test.Logf("Client IP : %v\n", requestPacket.CIAddr().String())
+	test.Logf("Your IP   : %v\n", requestPacket.YIAddr().String())
+	test.Logf("Server IP : %v\n", requestPacket.SIAddr().String())
+	test.Logf("Gateway IP: %v\n", requestPacket.GIAddr().String())
+	test.Logf("Client Mac: %v\n", requestPacket.CHAddr().String())
+
+	acknowledgement, err := client.GetAcknowledgement(&requestPacket)
+	if err != nil {
+		test.Error("Error Getting Acknowledgement:" + err.Error())
+	}
+
+	test.Log("--Acknowledgement Packet--")
+	test.Logf("Client IP : %v\n", acknowledgement.CIAddr().String())
+	test.Logf("Your IP   : %v\n", acknowledgement.YIAddr().String())
+	test.Logf("Server IP : %v\n", acknowledgement.SIAddr().String())
+	test.Logf("Gateway IP: %v\n", acknowledgement.GIAddr().String())
+	test.Logf("Client Mac: %v\n", acknowledgement.CHAddr().String())
+
+	acknowledgementOptions := acknowledgement.ParseOptions()
+	if len(acknowledgementOptions[dhcp4.OptionDHCPMessageType]) <= 0 || dhcp4.MessageType(acknowledgementOptions[dhcp4.OptionDHCPMessageType][0]) != dhcp4.NAK {
+		test.Errorf("Didn't get NAK got DHCP4 Message Type:%v\n", dhcp4.MessageType(acknowledgementOptions[dhcp4.OptionDHCPMessageType][0]))
+	}
+
+	test.Log("Shutting Down Server")
+	myServer.Shutdown()
+	wg.Wait()
+}
+
+/*
+ *
+ */
+func TestConsumeLeases(test *testing.T) {
+	//Setup the Server
+	myServer, err := dhcp4server.New(
+		net.IPv4(127, 0, 0, 1),
+		getTestLeasePool(),
+	)
+	if err != nil {
+		test.Error("Error: Can't Configure Server " + err.Error())
+	}
+
+	// Setup A Client
+	// Although We Won't send the packets over the network we'll use the client to create the requests.
+	c, err := dhcp4client.NewInetSock(dhcp4client.SetLocalAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1068}), dhcp4client.SetRemoteAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1067}))
+	if err != nil {
+		test.Error("Client Conection Generation:" + err.Error())
+	}
+
+	client, err := dhcp4client.New(dhcp4client.Connection(c))
+	if err != nil {
+		test.Error("Error: Can't Configure Client " + err.Error())
+	}
+	defer client.Close()
+
+	for i := 0; i < 30; i++ {
+		//Generate Hardware Address
+		HardwareMACAddress, err := hardwareaddr.GenerateEUI48()
+		if err != nil {
+			test.Error("Error: Can't Generate Valid MACAddress" + err.Error())
+		}
+
+		client.SetOption(dhcp4client.HardwareAddr(HardwareMACAddress))
+		test.Log("MAC:" + HardwareMACAddress.String())
+
+		discovery := client.DiscoverPacket()
+
+		//Run the Discovery On the Server
+		offer, err := myServer.ServeDHCP(discovery)
+		_, err = myServer.ServeDHCP(discovery)
+		if err != nil {
+			test.Error("Discovery Error:" + err.Error())
+		}
+
+		request := client.RequestPacket(&offer)
+		acknowledgement, err := myServer.ServeDHCP(request)
+		if err != nil {
+			test.Error("Acknowledge Error:" + err.Error())
+		}
+
+		test.Logf("Received Lease:%v\n", acknowledgement.YIAddr().String())
+		if !dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i).Equal(acknowledgement.YIAddr()) {
+			test.Error("Expected IP:" + dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i).String() + " Received:" + acknowledgement.YIAddr().String())
+		}
+
+		//How long the lease is for?
+		acknowledgementOptions := acknowledgement.ParseOptions()
+		if len(acknowledgementOptions) > 0 {
+			test.Logf("Lease Options:%v\n", acknowledgementOptions)
+			if acknowledgementOptions[dhcp4.OptionIPAddressLeaseTime] != nil {
+				var result uint32
+				buf := bytes.NewBuffer(acknowledgementOptions[dhcp4.OptionIPAddressLeaseTime])
+				binary.Read(buf, binary.BigEndian, &result)
+				test.Logf("Lease Time (Seconds):%d\n", result)
+			}
+		} else {
+			test.Errorf("Lease:\"%v\" Has No Options\n", acknowledgement.YIAddr())
+		}
+	}
+}
+
+/*
+ * Benchmark the ServeDHCP Function
+ */
+func BenchmarkServeDHCP(test *testing.B) {
+	//Create a Lease Pool We're going to use a memory pool
+	//Remember the memory is cleared on restart so you will reissue the same IP Addresses.
+	myMemoryLeasePool := memorypool.MemoryPool{}
+
+	//Lets add a list of IPs to the pool these will be served to the clients so make sure they work for you.
+	// So Create Array of IPs 192.168.1.1 to 192.168.1.30
+	for i := 0; i < test.N; i++ {
+		err := myMemoryLeasePool.AddLease(leasepool.Lease{IP: dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i)})
+		if err != nil {
+			log.Fatalln("Error Adding IP to pool:" + err.Error())
+		}
+	}
+
+	//Setup the Server
+	myServer, err := dhcp4server.New(
+		net.IPv4(127, 0, 0, 1),
+		&myMemoryLeasePool,
+	)
+	if err != nil {
+		test.Error("Error: Can't Configure Server " + err.Error())
+	}
+
+	//Setup A Client
+	// Although We Won't send the packets over the network we'll use the client to create the requests.
+	c, err := dhcp4client.NewInetSock(dhcp4client.SetLocalAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1068}), dhcp4client.SetRemoteAddr(net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 1067}))
+	if err != nil {
+		test.Error("Client Conection Generation:" + err.Error())
+	}
+
+	client, err := dhcp4client.New(dhcp4client.Connection(c))
+	if err != nil {
+		test.Error("Error: Can't Configure Client " + err.Error())
+	}
+	defer client.Close()
+
+	test.ResetTimer()
+
+	for i := 0; i < test.N; i++ {
+		test.StopTimer()
+		//Generate Hardware Address
+		HardwareMACAddress, err := hardwareaddr.GenerateEUI48()
+		if err != nil {
+			test.Error("Error: Can't Generate Valid MACAddress" + err.Error())
+		}
+
+		client.SetOption(dhcp4client.HardwareAddr(HardwareMACAddress))
+		discovery := client.DiscoverPacket()
+
+		//Run the Discovery On the Server
+		test.StartTimer()
+		offer, err := myServer.ServeDHCP(discovery)
+		if err != nil {
+			test.Error("Discovery Error:" + err.Error())
+		}
+
+		if len(offer) == 0 {
+			test.Error("No Valid Offer")
+		} else {
+			request := client.RequestPacket(&offer)
+			_, err := myServer.ServeDHCP(request)
+			if err != nil {
+				test.Error("Acknowledge Error:" + err.Error())
+			}
+
+		}
+	}
+}
+
+func getTestLeasePool() *memorypool.MemoryPool {
+	//Create a Lease Pool We're going to use a memory pool
+	//Remember the memory is cleared on restart so you will reissue the same IP Addresses.
+	myMemoryLeasePool := memorypool.MemoryPool{}
+
+	//Lets add a list of IPs to the pool these will be served to the clients so make sure they work for you.
+	// So Create Array of IPs 192.168.1.1 to 192.168.1.30
+	for i := 0; i < 30; i++ {
+		err := myMemoryLeasePool.AddLease(leasepool.Lease{IP: dhcp4.IPAdd(net.IPv4(192, 168, 1, 1), i)})
+		if err != nil {
+			log.Fatalln("Error Adding IP to pool:" + err.Error())
+		}
+	}
+	return &myMemoryLeasePool
+}

vendor/golang.org/x/net/bpf/asm.go

@@ -0,0 +1,41 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import "fmt"
+
+// Assemble converts insts into raw instructions suitable for loading
+// into a BPF virtual machine.
+//
+// Currently, no optimization is attempted, the assembled program flow
+// is exactly as provided.
+func Assemble(insts []Instruction) ([]RawInstruction, error) {
+	ret := make([]RawInstruction, len(insts))
+	var err error
+	for i, inst := range insts {
+		ret[i], err = inst.Assemble()
+		if err != nil {
+			return nil, fmt.Errorf("assembling instruction %d: %s", i+1, err)
+		}
+	}
+	return ret, nil
+}
+
+// Disassemble attempts to parse raw back into
+// Instructions. Unrecognized RawInstructions are assumed to be an
+// extension not implemented by this package, and are passed through
+// unchanged to the output. The allDecoded value reports whether insts
+// contains no RawInstructions.
+func Disassemble(raw []RawInstruction) (insts []Instruction, allDecoded bool) {
+	insts = make([]Instruction, len(raw))
+	allDecoded = true
+	for i, r := range raw {
+		insts[i] = r.Disassemble()
+		if _, ok := insts[i].(RawInstruction); ok {
+			allDecoded = false
+		}
+	}
+	return insts, allDecoded
+}

vendor/golang.org/x/net/bpf/constants.go

@@ -0,0 +1,215 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+// A Register is a register of the BPF virtual machine.
+type Register uint16
+
+const (
+	// RegA is the accumulator register. RegA is always the
+	// destination register of ALU operations.
+	RegA Register = iota
+	// RegX is the indirection register, used by LoadIndirect
+	// operations.
+	RegX
+)
+
+// An ALUOp is an arithmetic or logic operation.
+type ALUOp uint16
+
+// ALU binary operation types.
+const (
+	ALUOpAdd ALUOp = iota << 4
+	ALUOpSub
+	ALUOpMul
+	ALUOpDiv
+	ALUOpOr
+	ALUOpAnd
+	ALUOpShiftLeft
+	ALUOpShiftRight
+	aluOpNeg // Not exported because it's the only unary ALU operation, and gets its own instruction type.
+	ALUOpMod
+	ALUOpXor
+)
+
+// A JumpTest is a comparison operator used in conditional jumps.
+type JumpTest uint16
+
+// Supported operators for conditional jumps.
+const (
+	// K == A
+	JumpEqual JumpTest = iota
+	// K != A
+	JumpNotEqual
+	// K > A
+	JumpGreaterThan
+	// K < A
+	JumpLessThan
+	// K >= A
+	JumpGreaterOrEqual
+	// K <= A
+	JumpLessOrEqual
+	// K & A != 0
+	JumpBitsSet
+	// K & A == 0
+	JumpBitsNotSet
+)
+
+// An Extension is a function call provided by the kernel that
+// performs advanced operations that are expensive or impossible
+// within the BPF virtual machine.
+//
+// Extensions are only implemented by the Linux kernel.
+//
+// TODO: should we prune this list? Some of these extensions seem
+// either broken or near-impossible to use correctly, whereas other
+// (len, random, ifindex) are quite useful.
+type Extension int
+
+// Extension functions available in the Linux kernel.
+const (
+	// ExtLen returns the length of the packet.
+	ExtLen Extension = 1
+	// ExtProto returns the packet's L3 protocol type.
+	ExtProto = 0
+	// ExtType returns the packet's type (skb->pkt_type in the kernel)
+	//
+	// TODO: better documentation. How nice an API do we want to
+	// provide for these esoteric extensions?
+	ExtType = 4
+	// ExtPayloadOffset returns the offset of the packet payload, or
+	// the first protocol header that the kernel does not know how to
+	// parse.
+	ExtPayloadOffset = 52
+	// ExtInterfaceIndex returns the index of the interface on which
+	// the packet was received.
+	ExtInterfaceIndex = 8
+	// ExtNetlinkAttr returns the netlink attribute of type X at
+	// offset A.
+	ExtNetlinkAttr = 12
+	// ExtNetlinkAttrNested returns the nested netlink attribute of
+	// type X at offset A.
+	ExtNetlinkAttrNested = 16
+	// ExtMark returns the packet's mark value.
+	ExtMark = 20
+	// ExtQueue returns the packet's assigned hardware queue.
+	ExtQueue = 24
+	// ExtLinkLayerType returns the packet's hardware address type
+	// (e.g. Ethernet, Infiniband).
+	ExtLinkLayerType = 28
+	// ExtRXHash returns the packets receive hash.
+	//
+	// TODO: figure out what this rxhash actually is.
+	ExtRXHash = 32
+	// ExtCPUID returns the ID of the CPU processing the current
+	// packet.
+	ExtCPUID = 36
+	// ExtVLANTag returns the packet's VLAN tag.
+	ExtVLANTag = 44
+	// ExtVLANTagPresent returns non-zero if the packet has a VLAN
+	// tag.
+	//
+	// TODO: I think this might be a lie: it reads bit 0x1000 of the
+	// VLAN header, which changed meaning in recent revisions of the
+	// spec - this extension may now return meaningless information.
+	ExtVLANTagPresent = 48
+	// ExtVLANProto returns 0x8100 if the frame has a VLAN header,
+	// 0x88a8 if the frame has a "Q-in-Q" double VLAN header, or some
+	// other value if no VLAN information is present.
+	ExtVLANProto = 60
+	// ExtRand returns a uniformly random uint32.
+	ExtRand = 56
+)
+
+// The following gives names to various bit patterns used in opcode construction.
+
+const (
+	opMaskCls uint16 = 0x7
+	// opClsLoad masks
+	opMaskLoadDest  = 0x01
+	opMaskLoadWidth = 0x18
+	opMaskLoadMode  = 0xe0
+	// opClsALU
+	opMaskOperandSrc = 0x08
+	opMaskOperator   = 0xf0
+	// opClsJump
+	opMaskJumpConst = 0x0f
+	opMaskJumpCond  = 0xf0
+)
+
+const (
+	// +---------------+-----------------+---+---+---+
+	// | AddrMode (3b) | LoadWidth (2b)  | 0 | 0 | 0 |
+	// +---------------+-----------------+---+---+---+
+	opClsLoadA uint16 = iota
+	// +---------------+-----------------+---+---+---+
+	// | AddrMode (3b) | LoadWidth (2b)  | 0 | 0 | 1 |
+	// +---------------+-----------------+---+---+---+
+	opClsLoadX
+	// +---+---+---+---+---+---+---+---+
+	// | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
+	// +---+---+---+---+---+---+---+---+
+	opClsStoreA
+	// +---+---+---+---+---+---+---+---+
+	// | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
+	// +---+---+---+---+---+---+---+---+
+	opClsStoreX
+	// +---------------+-----------------+---+---+---+
+	// | Operator (4b) | OperandSrc (1b) | 1 | 0 | 0 |
+	// +---------------+-----------------+---+---+---+
+	opClsALU
+	// +-----------------------------+---+---+---+---+
+	// |      TestOperator (4b)      | 0 | 1 | 0 | 1 |
+	// +-----------------------------+---+---+---+---+
+	opClsJump
+	// +---+-------------------------+---+---+---+---+
+	// | 0 | 0 | 0 |   RetSrc (1b)   | 0 | 1 | 1 | 0 |
+	// +---+-------------------------+---+---+---+---+
+	opClsReturn
+	// +---+-------------------------+---+---+---+---+
+	// | 0 | 0 | 0 |  TXAorTAX (1b)  | 0 | 1 | 1 | 1 |
+	// +---+-------------------------+---+---+---+---+
+	opClsMisc
+)
+
+const (
+	opAddrModeImmediate uint16 = iota << 5
+	opAddrModeAbsolute
+	opAddrModeIndirect
+	opAddrModeScratch
+	opAddrModePacketLen // actually an extension, not an addressing mode.
+	opAddrModeMemShift
+)
+
+const (
+	opLoadWidth4 uint16 = iota << 3
+	opLoadWidth2
+	opLoadWidth1
+)
+
+// Operator defined by ALUOp*
+
+const (
+	opALUSrcConstant uint16 = iota << 3
+	opALUSrcX
+)
+
+const (
+	opJumpAlways = iota << 4
+	opJumpEqual
+	opJumpGT
+	opJumpGE
+	opJumpSet
+)
+
+const (
+	opRetSrcConstant uint16 = iota << 4
+	opRetSrcA
+)
+
+const (
+	opMiscTAX = 0x00
+	opMiscTXA = 0x80
+)

vendor/golang.org/x/net/bpf/doc.go

@@ -0,0 +1,82 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+
+Package bpf implements marshaling and unmarshaling of programs for the
+Berkeley Packet Filter virtual machine, and provides a Go implementation
+of the virtual machine.
+
+BPF's main use is to specify a packet filter for network taps, so that
+the kernel doesn't have to expensively copy every packet it sees to
+userspace. However, it's been repurposed to other areas where running
+user code in-kernel is needed. For example, Linux's seccomp uses BPF
+to apply security policies to system calls. For simplicity, this
+documentation refers only to packets, but other uses of BPF have their
+own data payloads.
+
+BPF programs run in a restricted virtual machine. It has almost no
+access to kernel functions, and while conditional branches are
+allowed, they can only jump forwards, to guarantee that there are no
+infinite loops.
+
+The virtual machine
+
+The BPF VM is an accumulator machine. Its main register, called
+register A, is an implicit source and destination in all arithmetic
+and logic operations. The machine also has 16 scratch registers for
+temporary storage, and an indirection register (register X) for
+indirect memory access. All registers are 32 bits wide.
+
+Each run of a BPF program is given one packet, which is placed in the
+VM's read-only "main memory". LoadAbsolute and LoadIndirect
+instructions can fetch up to 32 bits at a time into register A for
+examination.
+
+The goal of a BPF program is to produce and return a verdict (uint32),
+which tells the kernel what to do with the packet. In the context of
+packet filtering, the returned value is the number of bytes of the
+packet to forward to userspace, or 0 to ignore the packet. Other
+contexts like seccomp define their own return values.
+
+In order to simplify programs, attempts to read past the end of the
+packet terminate the program execution with a verdict of 0 (ignore
+packet). This means that the vast majority of BPF programs don't need
+to do any explicit bounds checking.
+
+In addition to the bytes of the packet, some BPF programs have access
+to extensions, which are essentially calls to kernel utility
+functions. Currently, the only extensions supported by this package
+are the Linux packet filter extensions.
+
+Examples
+
+This packet filter selects all ARP packets.
+
+	bpf.Assemble([]bpf.Instruction{
+		// Load "EtherType" field from the ethernet header.
+		bpf.LoadAbsolute{Off: 12, Size: 2},
+		// Skip over the next instruction if EtherType is not ARP.
+		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x0806, SkipTrue: 1},
+		// Verdict is "send up to 4k of the packet to userspace."
+		bpf.RetConstant{Val: 4096},
+		// Verdict is "ignore packet."
+		bpf.RetConstant{Val: 0},
+	})
+
+This packet filter captures a random 1% sample of traffic.
+
+	bpf.Assemble([]bpf.Instruction{
+		// Get a 32-bit random number from the Linux kernel.
+		bpf.LoadExtension{Num: bpf.ExtRand},
+		// 1% dice roll?
+		bpf.JumpIf{Cond: bpf.JumpLessThan, Val: 2^32/100, SkipFalse: 1},
+		// Capture.
+		bpf.RetConstant{Val: 4096},
+		// Ignore.
+		bpf.RetConstant{Val: 0},
+	})
+
+*/
+package bpf // import "golang.org/x/net/bpf"

vendor/golang.org/x/net/bpf/instructions.go

@@ -0,0 +1,434 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import "fmt"
+
+// An Instruction is one instruction executed by the BPF virtual
+// machine.
+type Instruction interface {
+	// Assemble assembles the Instruction into a RawInstruction.
+	Assemble() (RawInstruction, error)
+}
+
+// A RawInstruction is a raw BPF virtual machine instruction.
+type RawInstruction struct {
+	// Operation to execute.
+	Op uint16
+	// For conditional jump instructions, the number of instructions
+	// to skip if the condition is true/false.
+	Jt uint8
+	Jf uint8
+	// Constant parameter. The meaning depends on the Op.
+	K uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (ri RawInstruction) Assemble() (RawInstruction, error) { return ri, nil }
+
+// Disassemble parses ri into an Instruction and returns it. If ri is
+// not recognized by this package, ri itself is returned.
+func (ri RawInstruction) Disassemble() Instruction {
+	switch ri.Op & opMaskCls {
+	case opClsLoadA, opClsLoadX:
+		reg := Register(ri.Op & opMaskLoadDest)
+		sz := 0
+		switch ri.Op & opMaskLoadWidth {
+		case opLoadWidth4:
+			sz = 4
+		case opLoadWidth2:
+			sz = 2
+		case opLoadWidth1:
+			sz = 1
+		default:
+			return ri
+		}
+		switch ri.Op & opMaskLoadMode {
+		case opAddrModeImmediate:
+			if sz != 4 {
+				return ri
+			}
+			return LoadConstant{Dst: reg, Val: ri.K}
+		case opAddrModeScratch:
+			if sz != 4 || ri.K > 15 {
+				return ri
+			}
+			return LoadScratch{Dst: reg, N: int(ri.K)}
+		case opAddrModeAbsolute:
+			return LoadAbsolute{Size: sz, Off: ri.K}
+		case opAddrModeIndirect:
+			return LoadIndirect{Size: sz, Off: ri.K}
+		case opAddrModePacketLen:
+			if sz != 4 {
+				return ri
+			}
+			return LoadExtension{Num: ExtLen}
+		case opAddrModeMemShift:
+			return LoadMemShift{Off: ri.K}
+		default:
+			return ri
+		}
+
+	case opClsStoreA:
+		if ri.Op != opClsStoreA || ri.K > 15 {
+			return ri
+		}
+		return StoreScratch{Src: RegA, N: int(ri.K)}
+
+	case opClsStoreX:
+		if ri.Op != opClsStoreX || ri.K > 15 {
+			return ri
+		}
+		return StoreScratch{Src: RegX, N: int(ri.K)}
+
+	case opClsALU:
+		switch op := ALUOp(ri.Op & opMaskOperator); op {
+		case ALUOpAdd, ALUOpSub, ALUOpMul, ALUOpDiv, ALUOpOr, ALUOpAnd, ALUOpShiftLeft, ALUOpShiftRight, ALUOpMod, ALUOpXor:
+			if ri.Op&opMaskOperandSrc != 0 {
+				return ALUOpX{Op: op}
+			}
+			return ALUOpConstant{Op: op, Val: ri.K}
+		case aluOpNeg:
+			return NegateA{}
+		default:
+			return ri
+		}
+
+	case opClsJump:
+		if ri.Op&opMaskJumpConst != opClsJump {
+			return ri
+		}
+		switch ri.Op & opMaskJumpCond {
+		case opJumpAlways:
+			return Jump{Skip: ri.K}
+		case opJumpEqual:
+			return JumpIf{
+				Cond:      JumpEqual,
+				Val:       ri.K,
+				SkipTrue:  ri.Jt,
+				SkipFalse: ri.Jf,
+			}
+		case opJumpGT:
+			return JumpIf{
+				Cond:      JumpGreaterThan,
+				Val:       ri.K,
+				SkipTrue:  ri.Jt,
+				SkipFalse: ri.Jf,
+			}
+		case opJumpGE:
+			return JumpIf{
+				Cond:      JumpGreaterOrEqual,
+				Val:       ri.K,
+				SkipTrue:  ri.Jt,
+				SkipFalse: ri.Jf,
+			}
+		case opJumpSet:
+			return JumpIf{
+				Cond:      JumpBitsSet,
+				Val:       ri.K,
+				SkipTrue:  ri.Jt,
+				SkipFalse: ri.Jf,
+			}
+		default:
+			return ri
+		}
+
+	case opClsReturn:
+		switch ri.Op {
+		case opClsReturn | opRetSrcA:
+			return RetA{}
+		case opClsReturn | opRetSrcConstant:
+			return RetConstant{Val: ri.K}
+		default:
+			return ri
+		}
+
+	case opClsMisc:
+		switch ri.Op {
+		case opClsMisc | opMiscTAX:
+			return TAX{}
+		case opClsMisc | opMiscTXA:
+			return TXA{}
+		default:
+			return ri
+		}
+
+	default:
+		panic("unreachable") // switch is exhaustive on the bit pattern
+	}
+}
+
+// LoadConstant loads Val into register Dst.
+type LoadConstant struct {
+	Dst Register
+	Val uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadConstant) Assemble() (RawInstruction, error) {
+	return assembleLoad(a.Dst, 4, opAddrModeImmediate, a.Val)
+}
+
+// LoadScratch loads scratch[N] into register Dst.
+type LoadScratch struct {
+	Dst Register
+	N   int // 0-15
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadScratch) Assemble() (RawInstruction, error) {
+	if a.N < 0 || a.N > 15 {
+		return RawInstruction{}, fmt.Errorf("invalid scratch slot %d", a.N)
+	}
+	return assembleLoad(a.Dst, 4, opAddrModeScratch, uint32(a.N))
+}
+
+// LoadAbsolute loads packet[Off:Off+Size] as an integer value into
+// register A.
+type LoadAbsolute struct {
+	Off  uint32
+	Size int // 1, 2 or 4
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadAbsolute) Assemble() (RawInstruction, error) {
+	return assembleLoad(RegA, a.Size, opAddrModeAbsolute, a.Off)
+}
+
+// LoadIndirect loads packet[X+Off:X+Off+Size] as an integer value
+// into register A.
+type LoadIndirect struct {
+	Off  uint32
+	Size int // 1, 2 or 4
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadIndirect) Assemble() (RawInstruction, error) {
+	return assembleLoad(RegA, a.Size, opAddrModeIndirect, a.Off)
+}
+
+// LoadMemShift multiplies the first 4 bits of the byte at packet[Off]
+// by 4 and stores the result in register X.
+//
+// This instruction is mainly useful to load into X the length of an
+// IPv4 packet header in a single instruction, rather than have to do
+// the arithmetic on the header's first byte by hand.
+type LoadMemShift struct {
+	Off uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadMemShift) Assemble() (RawInstruction, error) {
+	return assembleLoad(RegX, 1, opAddrModeMemShift, a.Off)
+}
+
+// LoadExtension invokes a linux-specific extension and stores the
+// result in register A.
+type LoadExtension struct {
+	Num Extension
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadExtension) Assemble() (RawInstruction, error) {
+	if a.Num == ExtLen {
+		return assembleLoad(RegA, 4, opAddrModePacketLen, 0)
+	}
+	return assembleLoad(RegA, 4, opAddrModeAbsolute, uint32(-0x1000+a.Num))
+}
+
+// StoreScratch stores register Src into scratch[N].
+type StoreScratch struct {
+	Src Register
+	N   int // 0-15
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a StoreScratch) Assemble() (RawInstruction, error) {
+	if a.N < 0 || a.N > 15 {
+		return RawInstruction{}, fmt.Errorf("invalid scratch slot %d", a.N)
+	}
+	var op uint16
+	switch a.Src {
+	case RegA:
+		op = opClsStoreA
+	case RegX:
+		op = opClsStoreX
+	default:
+		return RawInstruction{}, fmt.Errorf("invalid source register %v", a.Src)
+	}
+
+	return RawInstruction{
+		Op: op,
+		K:  uint32(a.N),
+	}, nil
+}
+
+// ALUOpConstant executes A = A <Op> Val.
+type ALUOpConstant struct {
+	Op  ALUOp
+	Val uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a ALUOpConstant) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsALU | opALUSrcConstant | uint16(a.Op),
+		K:  a.Val,
+	}, nil
+}
+
+// ALUOpX executes A = A <Op> X
+type ALUOpX struct {
+	Op ALUOp
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a ALUOpX) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsALU | opALUSrcX | uint16(a.Op),
+	}, nil
+}
+
+// NegateA executes A = -A.
+type NegateA struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a NegateA) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsALU | uint16(aluOpNeg),
+	}, nil
+}
+
+// Jump skips the following Skip instructions in the program.
+type Jump struct {
+	Skip uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a Jump) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsJump | opJumpAlways,
+		K:  a.Skip,
+	}, nil
+}
+
+// JumpIf skips the following Skip instructions in the program if A
+// <Cond> Val is true.
+type JumpIf struct {
+	Cond      JumpTest
+	Val       uint32
+	SkipTrue  uint8
+	SkipFalse uint8
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a JumpIf) Assemble() (RawInstruction, error) {
+	var (
+		cond uint16
+		flip bool
+	)
+	switch a.Cond {
+	case JumpEqual:
+		cond = opJumpEqual
+	case JumpNotEqual:
+		cond, flip = opJumpEqual, true
+	case JumpGreaterThan:
+		cond = opJumpGT
+	case JumpLessThan:
+		cond, flip = opJumpGE, true
+	case JumpGreaterOrEqual:
+		cond = opJumpGE
+	case JumpLessOrEqual:
+		cond, flip = opJumpGT, true
+	case JumpBitsSet:
+		cond = opJumpSet
+	case JumpBitsNotSet:
+		cond, flip = opJumpSet, true
+	default:
+		return RawInstruction{}, fmt.Errorf("unknown JumpTest %v", a.Cond)
+	}
+	jt, jf := a.SkipTrue, a.SkipFalse
+	if flip {
+		jt, jf = jf, jt
+	}
+	return RawInstruction{
+		Op: opClsJump | cond,
+		Jt: jt,
+		Jf: jf,
+		K:  a.Val,
+	}, nil
+}
+
+// RetA exits the BPF program, returning the value of register A.
+type RetA struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a RetA) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsReturn | opRetSrcA,
+	}, nil
+}
+
+// RetConstant exits the BPF program, returning a constant value.
+type RetConstant struct {
+	Val uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a RetConstant) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsReturn | opRetSrcConstant,
+		K:  a.Val,
+	}, nil
+}
+
+// TXA copies the value of register X to register A.
+type TXA struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a TXA) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsMisc | opMiscTXA,
+	}, nil
+}
+
+// TAX copies the value of register A to register X.
+type TAX struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a TAX) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsMisc | opMiscTAX,
+	}, nil
+}
+
+func assembleLoad(dst Register, loadSize int, mode uint16, k uint32) (RawInstruction, error) {
+	var (
+		cls uint16
+		sz  uint16
+	)
+	switch dst {
+	case RegA:
+		cls = opClsLoadA
+	case RegX:
+		cls = opClsLoadX
+	default:
+		return RawInstruction{}, fmt.Errorf("invalid target register %v", dst)
+	}
+	switch loadSize {
+	case 1:
+		sz = opLoadWidth1
+	case 2:
+		sz = opLoadWidth2
+	case 4:
+		sz = opLoadWidth4
+	default:
+		return RawInstruction{}, fmt.Errorf("invalid load byte length %d", sz)
+	}
+	return RawInstruction{
+		Op: cls | sz | mode,
+		K:  k,
+	}, nil
+}

vendor/golang.org/x/net/bpf/instructions_test.go

@@ -0,0 +1,184 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import (
+	"io/ioutil"
+	"reflect"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+// This is a direct translation of the program in
+// testdata/all_instructions.txt.
+var allInstructions = []Instruction{
+	LoadConstant{Dst: RegA, Val: 42},
+	LoadConstant{Dst: RegX, Val: 42},
+
+	LoadScratch{Dst: RegA, N: 3},
+	LoadScratch{Dst: RegX, N: 3},
+
+	LoadAbsolute{Off: 42, Size: 1},
+	LoadAbsolute{Off: 42, Size: 2},
+	LoadAbsolute{Off: 42, Size: 4},
+
+	LoadIndirect{Off: 42, Size: 1},
+	LoadIndirect{Off: 42, Size: 2},
+	LoadIndirect{Off: 42, Size: 4},
+
+	LoadMemShift{Off: 42},
+
+	LoadExtension{Num: ExtLen},
+	LoadExtension{Num: ExtProto},
+	LoadExtension{Num: ExtType},
+	LoadExtension{Num: ExtRand},
+
+	StoreScratch{Src: RegA, N: 3},
+	StoreScratch{Src: RegX, N: 3},
+
+	ALUOpConstant{Op: ALUOpAdd, Val: 42},
+	ALUOpConstant{Op: ALUOpSub, Val: 42},
+	ALUOpConstant{Op: ALUOpMul, Val: 42},
+	ALUOpConstant{Op: ALUOpDiv, Val: 42},
+	ALUOpConstant{Op: ALUOpOr, Val: 42},
+	ALUOpConstant{Op: ALUOpAnd, Val: 42},
+	ALUOpConstant{Op: ALUOpShiftLeft, Val: 42},
+	ALUOpConstant{Op: ALUOpShiftRight, Val: 42},
+	ALUOpConstant{Op: ALUOpMod, Val: 42},
+	ALUOpConstant{Op: ALUOpXor, Val: 42},
+
+	ALUOpX{Op: ALUOpAdd},
+	ALUOpX{Op: ALUOpSub},
+	ALUOpX{Op: ALUOpMul},
+	ALUOpX{Op: ALUOpDiv},
+	ALUOpX{Op: ALUOpOr},
+	ALUOpX{Op: ALUOpAnd},
+	ALUOpX{Op: ALUOpShiftLeft},
+	ALUOpX{Op: ALUOpShiftRight},
+	ALUOpX{Op: ALUOpMod},
+	ALUOpX{Op: ALUOpXor},
+
+	NegateA{},
+
+	Jump{Skip: 10},
+	JumpIf{Cond: JumpEqual, Val: 42, SkipTrue: 8, SkipFalse: 9},
+	JumpIf{Cond: JumpNotEqual, Val: 42, SkipTrue: 8},
+	JumpIf{Cond: JumpLessThan, Val: 42, SkipTrue: 7},
+	JumpIf{Cond: JumpLessOrEqual, Val: 42, SkipTrue: 6},
+	JumpIf{Cond: JumpGreaterThan, Val: 42, SkipTrue: 4, SkipFalse: 5},
+	JumpIf{Cond: JumpGreaterOrEqual, Val: 42, SkipTrue: 3, SkipFalse: 4},
+	JumpIf{Cond: JumpBitsSet, Val: 42, SkipTrue: 2, SkipFalse: 3},
+
+	TAX{},
+	TXA{},
+
+	RetA{},
+	RetConstant{Val: 42},
+}
+var allInstructionsExpected = "testdata/all_instructions.bpf"
+
+// Check that we produce the same output as the canonical bpf_asm
+// linux kernel tool.
+func TestInterop(t *testing.T) {
+	out, err := Assemble(allInstructions)
+	if err != nil {
+		t.Fatalf("assembly of allInstructions program failed: %s", err)
+	}
+	t.Logf("Assembled program is %d instructions long", len(out))
+
+	bs, err := ioutil.ReadFile(allInstructionsExpected)
+	if err != nil {
+		t.Fatalf("reading %s: %s", allInstructionsExpected, err)
+	}
+	// First statement is the number of statements, last statement is
+	// empty. We just ignore both and rely on slice length.
+	stmts := strings.Split(string(bs), ",")
+	if len(stmts)-2 != len(out) {
+		t.Fatalf("test program lengths don't match: %s has %d, Go implementation has %d", allInstructionsExpected, len(stmts)-2, len(allInstructions))
+	}
+
+	for i, stmt := range stmts[1 : len(stmts)-2] {
+		nums := strings.Split(stmt, " ")
+		if len(nums) != 4 {
+			t.Fatalf("malformed instruction %d in %s: %s", i+1, allInstructionsExpected, stmt)
+		}
+
+		actual := out[i]
+
+		op, err := strconv.ParseUint(nums[0], 10, 16)
+		if err != nil {
+			t.Fatalf("malformed opcode %s in instruction %d of %s", nums[0], i+1, allInstructionsExpected)
+		}
+		if actual.Op != uint16(op) {
+			t.Errorf("opcode mismatch on instruction %d (%#v): got 0x%02x, want 0x%02x", i+1, allInstructions[i], actual.Op, op)
+		}
+
+		jt, err := strconv.ParseUint(nums[1], 10, 8)
+		if err != nil {
+			t.Fatalf("malformed jt offset %s in instruction %d of %s", nums[1], i+1, allInstructionsExpected)
+		}
+		if actual.Jt != uint8(jt) {
+			t.Errorf("jt mismatch on instruction %d (%#v): got %d, want %d", i+1, allInstructions[i], actual.Jt, jt)
+		}
+
+		jf, err := strconv.ParseUint(nums[2], 10, 8)
+		if err != nil {
+			t.Fatalf("malformed jf offset %s in instruction %d of %s", nums[2], i+1, allInstructionsExpected)
+		}
+		if actual.Jf != uint8(jf) {
+			t.Errorf("jf mismatch on instruction %d (%#v): got %d, want %d", i+1, allInstructions[i], actual.Jf, jf)
+		}
+
+		k, err := strconv.ParseUint(nums[3], 10, 32)
+		if err != nil {
+			t.Fatalf("malformed constant %s in instruction %d of %s", nums[3], i+1, allInstructionsExpected)
+		}
+		if actual.K != uint32(k) {
+			t.Errorf("constant mismatch on instruction %d (%#v): got %d, want %d", i+1, allInstructions[i], actual.K, k)
+		}
+	}
+}
+
+// Check that assembly and disassembly match each other.
+//
+// Because we offer "fake" jump conditions that don't appear in the
+// machine code, disassembly won't be a 1:1 match with the original
+// source, although the behavior will be identical. However,
+// reassembling the disassembly should produce an identical program.
+func TestAsmDisasm(t *testing.T) {
+	prog1, err := Assemble(allInstructions)
+	if err != nil {
+		t.Fatalf("assembly of allInstructions program failed: %s", err)
+	}
+	t.Logf("Assembled program is %d instructions long", len(prog1))
+
+	src, allDecoded := Disassemble(prog1)
+	if !allDecoded {
+		t.Errorf("Disassemble(Assemble(allInstructions)) produced unrecognized instructions:")
+		for i, inst := range src {
+			if r, ok := inst.(RawInstruction); ok {
+				t.Logf("  insn %d, %#v --> %#v", i+1, allInstructions[i], r)
+			}
+		}
+	}
+
+	prog2, err := Assemble(src)
+	if err != nil {
+		t.Fatalf("assembly of Disassemble(Assemble(allInstructions)) failed: %s", err)
+	}
+
+	if len(prog2) != len(prog1) {
+		t.Fatalf("disassembly changed program size: %d insns before, %d insns after", len(prog1), len(prog2))
+	}
+	if !reflect.DeepEqual(prog1, prog2) {
+		t.Errorf("program mutated by disassembly:")
+		for i := range prog2 {
+			if !reflect.DeepEqual(prog1[i], prog2[i]) {
+				t.Logf("  insn %d, s: %#v, p1: %#v, p2: %#v", i+1, allInstructions[i], prog1[i], prog2[i])
+			}
+		}
+	}
+}

vendor/golang.org/x/net/bpf/testdata/all_instructions.bpf

@@ -0,0 +1 @@
+50,0 0 0 42,1 0 0 42,96 0 0 3,97 0 0 3,48 0 0 42,40 0 0 42,32 0 0 42,80 0 0 42,72 0 0 42,64 0 0 42,177 0 0 42,128 0 0 0,32 0 0 4294963200,32 0 0 4294963204,32 0 0 4294963256,2 0 0 3,3 0 0 3,4 0 0 42,20 0 0 42,36 0 0 42,52 0 0 42,68 0 0 42,84 0 0 42,100 0 0 42,116 0 0 42,148 0 0 42,164 0 0 42,12 0 0 0,28 0 0 0,44 0 0 0,60 0 0 0,76 0 0 0,92 0 0 0,108 0 0 0,124 0 0 0,156 0 0 0,172 0 0 0,132 0 0 0,5 0 0 10,21 8 9 42,21 0 8 42,53 0 7 42,37 0 6 42,37 4 5 42,53 3 4 42,69 2 3 42,7 0 0 0,135 0 0 0,22 0 0 0,6 0 0 0,

vendor/golang.org/x/net/bpf/testdata/all_instructions.txt

@@ -0,0 +1,79 @@
+# This filter is compiled to all_instructions.bpf by the `bpf_asm`
+# tool, which can be found in the linux kernel source tree under
+# tools/net.
+
+# Load immediate
+ld #42
+ldx #42
+
+# Load scratch
+ld M[3]
+ldx M[3]
+
+# Load absolute
+ldb [42]
+ldh [42]
+ld [42]
+
+# Load indirect
+ldb [x + 42]
+ldh [x + 42]
+ld [x + 42]
+
+# Load IPv4 header length
+ldx 4*([42]&0xf)
+
+# Run extension function
+ld #len
+ld #proto
+ld #type
+ld #rand
+
+# Store scratch
+st M[3]
+stx M[3]
+
+# A <op> constant
+add #42
+sub #42
+mul #42
+div #42
+or #42
+and #42
+lsh #42
+rsh #42
+mod #42
+xor #42
+
+# A <op> X
+add x
+sub x
+mul x
+div x
+or x
+and x
+lsh x
+rsh x
+mod x
+xor x
+
+# !A
+neg
+
+# Jumps
+ja end
+jeq #42,prev,end
+jne #42,end
+jlt #42,end
+jle #42,end
+jgt #42,prev,end
+jge #42,prev,end
+jset #42,prev,end
+
+# Register transfers
+tax
+txa
+
+# Returns
+prev: ret a
+end: ret #42

vendor/golang.org/x/net/bpf/vm.go

@@ -0,0 +1,140 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import (
+	"errors"
+	"fmt"
+)
+
+// A VM is an emulated BPF virtual machine.
+type VM struct {
+	filter []Instruction
+}
+
+// NewVM returns a new VM using the input BPF program.
+func NewVM(filter []Instruction) (*VM, error) {
+	if len(filter) == 0 {
+		return nil, errors.New("one or more Instructions must be specified")
+	}
+
+	for i, ins := range filter {
+		check := len(filter) - (i + 1)
+		switch ins := ins.(type) {
+		// Check for out-of-bounds jumps in instructions
+		case Jump:
+			if check <= int(ins.Skip) {
+				return nil, fmt.Errorf("cannot jump %d instructions; jumping past program bounds", ins.Skip)
+			}
+		case JumpIf:
+			if check <= int(ins.SkipTrue) {
+				return nil, fmt.Errorf("cannot jump %d instructions in true case; jumping past program bounds", ins.SkipTrue)
+			}
+			if check <= int(ins.SkipFalse) {
+				return nil, fmt.Errorf("cannot jump %d instructions in false case; jumping past program bounds", ins.SkipFalse)
+			}
+		// Check for division or modulus by zero
+		case ALUOpConstant:
+			if ins.Val != 0 {
+				break
+			}
+
+			switch ins.Op {
+			case ALUOpDiv, ALUOpMod:
+				return nil, errors.New("cannot divide by zero using ALUOpConstant")
+			}
+		// Check for unknown extensions
+		case LoadExtension:
+			switch ins.Num {
+			case ExtLen:
+			default:
+				return nil, fmt.Errorf("extension %d not implemented", ins.Num)
+			}
+		}
+	}
+
+	// Make sure last instruction is a return instruction
+	switch filter[len(filter)-1].(type) {
+	case RetA, RetConstant:
+	default:
+		return nil, errors.New("BPF program must end with RetA or RetConstant")
+	}
+
+	// Though our VM works using disassembled instructions, we
+	// attempt to assemble the input filter anyway to ensure it is compatible
+	// with an operating system VM.
+	_, err := Assemble(filter)
+
+	return &VM{
+		filter: filter,
+	}, err
+}
+
+// Run runs the VM's BPF program against the input bytes.
+// Run returns the number of bytes accepted by the BPF program, and any errors
+// which occurred while processing the program.
+func (v *VM) Run(in []byte) (int, error) {
+	var (
+		// Registers of the virtual machine
+		regA       uint32
+		regX       uint32
+		regScratch [16]uint32
+
+		// OK is true if the program should continue processing the next
+		// instruction, or false if not, causing the loop to break
+		ok = true
+	)
+
+	// TODO(mdlayher): implement:
+	// - NegateA:
+	//   - would require a change from uint32 registers to int32
+	//     registers
+
+	// TODO(mdlayher): add interop tests that check signedness of ALU
+	// operations against kernel implementation, and make sure Go
+	// implementation matches behavior
+
+	for i := 0; i < len(v.filter) && ok; i++ {
+		ins := v.filter[i]
+
+		switch ins := ins.(type) {
+		case ALUOpConstant:
+			regA = aluOpConstant(ins, regA)
+		case ALUOpX:
+			regA, ok = aluOpX(ins, regA, regX)
+		case Jump:
+			i += int(ins.Skip)
+		case JumpIf:
+			jump := jumpIf(ins, regA)
+			i += jump
+		case LoadAbsolute:
+			regA, ok = loadAbsolute(ins, in)
+		case LoadConstant:
+			regA, regX = loadConstant(ins, regA, regX)
+		case LoadExtension:
+			regA = loadExtension(ins, in)
+		case LoadIndirect:
+			regA, ok = loadIndirect(ins, in, regX)
+		case LoadMemShift:
+			regX, ok = loadMemShift(ins, in)
+		case LoadScratch:
+			regA, regX = loadScratch(ins, regScratch, regA, regX)
+		case RetA:
+			return int(regA), nil
+		case RetConstant:
+			return int(ins.Val), nil
+		case StoreScratch:
+			regScratch = storeScratch(ins, regScratch, regA, regX)
+		case TAX:
+			regX = regA
+		case TXA:
+			regA = regX
+		default:
+			return 0, fmt.Errorf("unknown Instruction at index %d: %T", i, ins)
+		}
+	}
+
+	return 0, nil
+}

vendor/golang.org/x/net/bpf/vm_aluop_test.go

@@ -0,0 +1,512 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"testing"
+
+	"golang.org/x/net/bpf"
+)
+
+func TestVMALUOpAdd(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpAdd,
+			Val: 3,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		8, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 3, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpSub(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.TAX{},
+		bpf.ALUOpX{
+			Op: bpf.ALUOpSub,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		1, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpMul(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpMul,
+			Val: 2,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		6, 2, 3, 4,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 4, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpDiv(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpDiv,
+			Val: 2,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		20, 2, 3, 4,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 2, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpDivByZeroALUOpConstant(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpDiv,
+			Val: 0,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "cannot divide by zero using ALUOpConstant" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMALUOpDivByZeroALUOpX(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		// Load byte 0 into X
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.TAX{},
+		// Load byte 1 into A
+		bpf.LoadAbsolute{
+			Off:  9,
+			Size: 1,
+		},
+		// Attempt to perform 1/0
+		bpf.ALUOpX{
+			Op: bpf.ALUOpDiv,
+		},
+		// Return 4 bytes if program does not terminate
+		bpf.LoadConstant{
+			Val: 12,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 3, 4,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpOr(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 2,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpOr,
+			Val: 0x01,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0x00, 0x10, 0x03, 0x04,
+		0x05, 0x06, 0x07, 0x08,
+		0x09, 0xff,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 9, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpAnd(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 2,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpAnd,
+			Val: 0x0019,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0xaa, 0x09,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpShiftLeft(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpShiftLeft,
+			Val: 0x01,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      0x02,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0x01, 0xaa,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpShiftRight(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpShiftRight,
+			Val: 0x01,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      0x04,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0x08, 0xff, 0xff,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpMod(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpMod,
+			Val: 20,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		30, 0, 0,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 2, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpModByZeroALUOpConstant(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpMod,
+			Val: 0,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "cannot divide by zero using ALUOpConstant" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMALUOpModByZeroALUOpX(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		// Load byte 0 into X
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.TAX{},
+		// Load byte 1 into A
+		bpf.LoadAbsolute{
+			Off:  9,
+			Size: 1,
+		},
+		// Attempt to perform 1%0
+		bpf.ALUOpX{
+			Op: bpf.ALUOpMod,
+		},
+		// Return 4 bytes if program does not terminate
+		bpf.LoadConstant{
+			Val: 12,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 3, 4,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpXor(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpXor,
+			Val: 0x0a,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      0x01,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0x0b, 0x00, 0x00, 0x00,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMALUOpUnknown(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.ALUOpConstant{
+			Op:  bpf.ALUOpAdd,
+			Val: 1,
+		},
+		// Verify that an unknown operation is a no-op
+		bpf.ALUOpConstant{
+			Op: 100,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      0x02,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		1,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}

vendor/golang.org/x/net/bpf/vm_bpf_test.go

@@ -0,0 +1,192 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"net"
+	"runtime"
+	"testing"
+	"time"
+
+	"golang.org/x/net/bpf"
+	"golang.org/x/net/ipv4"
+)
+
+// A virtualMachine is a BPF virtual machine which can process an
+// input packet against a BPF program and render a verdict.
+type virtualMachine interface {
+	Run(in []byte) (int, error)
+}
+
+// canUseOSVM indicates if the OS BPF VM is available on this platform.
+func canUseOSVM() bool {
+	// OS BPF VM can only be used on platforms where x/net/ipv4 supports
+	// attaching a BPF program to a socket.
+	switch runtime.GOOS {
+	case "linux":
+		return true
+	}
+
+	return false
+}
+
+// All BPF tests against both the Go VM and OS VM are assumed to
+// be used with a UDP socket.  As a result, the entire contents
+// of a UDP datagram is sent through the BPF program, but only
+// the body after the UDP header will ever be returned in output.
+
+// testVM sets up a Go BPF VM, and if available, a native OS BPF VM
+// for integration testing.
+func testVM(t *testing.T, filter []bpf.Instruction) (virtualMachine, func(), error) {
+	goVM, err := bpf.NewVM(filter)
+	if err != nil {
+		// Some tests expect an error, so this error must be returned
+		// instead of fatally exiting the test
+		return nil, nil, err
+	}
+
+	mvm := &multiVirtualMachine{
+		goVM: goVM,
+
+		t: t,
+	}
+
+	// If available, add the OS VM for tests which verify that both the Go
+	// VM and OS VM have exactly the same output for the same input program
+	// and packet.
+	done := func() {}
+	if canUseOSVM() {
+		osVM, osVMDone := testOSVM(t, filter)
+		done = func() { osVMDone() }
+		mvm.osVM = osVM
+	}
+
+	return mvm, done, nil
+}
+
+// udpHeaderLen is the length of a UDP header.
+const udpHeaderLen = 8
+
+// A multiVirtualMachine is a virtualMachine which can call out to both the Go VM
+// and the native OS VM, if the OS VM is available.
+type multiVirtualMachine struct {
+	goVM virtualMachine
+	osVM virtualMachine
+
+	t *testing.T
+}
+
+func (mvm *multiVirtualMachine) Run(in []byte) (int, error) {
+	if len(in) < udpHeaderLen {
+		mvm.t.Fatalf("input must be at least length of UDP header (%d), got: %d",
+			udpHeaderLen, len(in))
+	}
+
+	// All tests have a UDP header as part of input, because the OS VM
+	// packets always will.  For the Go VM, this output is trimmed before
+	// being sent back to tests.
+	goOut, goErr := mvm.goVM.Run(in)
+	if goOut >= udpHeaderLen {
+		goOut -= udpHeaderLen
+	}
+
+	// If Go output is larger than the size of the packet, packet filtering
+	// interop tests must trim the output bytes to the length of the packet.
+	// The BPF VM should not do this on its own, as other uses of it do
+	// not trim the output byte count.
+	trim := len(in) - udpHeaderLen
+	if goOut > trim {
+		goOut = trim
+	}
+
+	// When the OS VM is not available, process using the Go VM alone
+	if mvm.osVM == nil {
+		return goOut, goErr
+	}
+
+	// The OS VM will apply its own UDP header, so remove the pseudo header
+	// that the Go VM needs.
+	osOut, err := mvm.osVM.Run(in[udpHeaderLen:])
+	if err != nil {
+		mvm.t.Fatalf("error while running OS VM: %v", err)
+	}
+
+	// Verify both VMs return same number of bytes
+	var mismatch bool
+	if goOut != osOut {
+		mismatch = true
+		mvm.t.Logf("output byte count does not match:\n- go: %v\n- os: %v", goOut, osOut)
+	}
+
+	if mismatch {
+		mvm.t.Fatal("Go BPF and OS BPF packet outputs do not match")
+	}
+
+	return goOut, goErr
+}
+
+// An osVirtualMachine is a virtualMachine which uses the OS's BPF VM for
+// processing BPF programs.
+type osVirtualMachine struct {
+	l net.PacketConn
+	s net.Conn
+}
+
+// testOSVM creates a virtualMachine which uses the OS's BPF VM by injecting
+// packets into a UDP listener with a BPF program attached to it.
+func testOSVM(t *testing.T, filter []bpf.Instruction) (virtualMachine, func()) {
+	l, err := net.ListenPacket("udp4", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("failed to open OS VM UDP listener: %v", err)
+	}
+
+	prog, err := bpf.Assemble(filter)
+	if err != nil {
+		t.Fatalf("failed to compile BPF program: %v", err)
+	}
+
+	p := ipv4.NewPacketConn(l)
+	if err = p.SetBPF(prog); err != nil {
+		t.Fatalf("failed to attach BPF program to listener: %v", err)
+	}
+
+	s, err := net.Dial("udp4", l.LocalAddr().String())
+	if err != nil {
+		t.Fatalf("failed to dial connection to listener: %v", err)
+	}
+
+	done := func() {
+		_ = s.Close()
+		_ = l.Close()
+	}
+
+	return &osVirtualMachine{
+		l: l,
+		s: s,
+	}, done
+}
+
+// Run sends the input bytes into the OS's BPF VM and returns its verdict.
+func (vm *osVirtualMachine) Run(in []byte) (int, error) {
+	go func() {
+		_, _ = vm.s.Write(in)
+	}()
+
+	vm.l.SetDeadline(time.Now().Add(50 * time.Millisecond))
+
+	var b [512]byte
+	n, _, err := vm.l.ReadFrom(b[:])
+	if err != nil {
+		// A timeout indicates that BPF filtered out the packet, and thus,
+		// no input should be returned.
+		if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
+			return n, nil
+		}
+
+		return n, err
+	}
+
+	return n, nil
+}

vendor/golang.org/x/net/bpf/vm_extension_test.go

@@ -0,0 +1,49 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"testing"
+
+	"golang.org/x/net/bpf"
+)
+
+func TestVMLoadExtensionNotImplemented(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.LoadExtension{
+			Num: 100,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "extension 100 not implemented" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMLoadExtensionExtLen(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadExtension{
+			Num: bpf.ExtLen,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 4, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}

vendor/golang.org/x/net/bpf/vm_instructions.go

@@ -0,0 +1,174 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+func aluOpConstant(ins ALUOpConstant, regA uint32) uint32 {
+	return aluOpCommon(ins.Op, regA, ins.Val)
+}
+
+func aluOpX(ins ALUOpX, regA uint32, regX uint32) (uint32, bool) {
+	// Guard against division or modulus by zero by terminating
+	// the program, as the OS BPF VM does
+	if regX == 0 {
+		switch ins.Op {
+		case ALUOpDiv, ALUOpMod:
+			return 0, false
+		}
+	}
+
+	return aluOpCommon(ins.Op, regA, regX), true
+}
+
+func aluOpCommon(op ALUOp, regA uint32, value uint32) uint32 {
+	switch op {
+	case ALUOpAdd:
+		return regA + value
+	case ALUOpSub:
+		return regA - value
+	case ALUOpMul:
+		return regA * value
+	case ALUOpDiv:
+		// Division by zero not permitted by NewVM and aluOpX checks
+		return regA / value
+	case ALUOpOr:
+		return regA | value
+	case ALUOpAnd:
+		return regA & value
+	case ALUOpShiftLeft:
+		return regA << value
+	case ALUOpShiftRight:
+		return regA >> value
+	case ALUOpMod:
+		// Modulus by zero not permitted by NewVM and aluOpX checks
+		return regA % value
+	case ALUOpXor:
+		return regA ^ value
+	default:
+		return regA
+	}
+}
+
+func jumpIf(ins JumpIf, value uint32) int {
+	var ok bool
+	inV := uint32(ins.Val)
+
+	switch ins.Cond {
+	case JumpEqual:
+		ok = value == inV
+	case JumpNotEqual:
+		ok = value != inV
+	case JumpGreaterThan:
+		ok = value > inV
+	case JumpLessThan:
+		ok = value < inV
+	case JumpGreaterOrEqual:
+		ok = value >= inV
+	case JumpLessOrEqual:
+		ok = value <= inV
+	case JumpBitsSet:
+		ok = (value & inV) != 0
+	case JumpBitsNotSet:
+		ok = (value & inV) == 0
+	}
+
+	if ok {
+		return int(ins.SkipTrue)
+	}
+
+	return int(ins.SkipFalse)
+}
+
+func loadAbsolute(ins LoadAbsolute, in []byte) (uint32, bool) {
+	offset := int(ins.Off)
+	size := int(ins.Size)
+
+	return loadCommon(in, offset, size)
+}
+
+func loadConstant(ins LoadConstant, regA uint32, regX uint32) (uint32, uint32) {
+	switch ins.Dst {
+	case RegA:
+		regA = ins.Val
+	case RegX:
+		regX = ins.Val
+	}
+
+	return regA, regX
+}
+
+func loadExtension(ins LoadExtension, in []byte) uint32 {
+	switch ins.Num {
+	case ExtLen:
+		return uint32(len(in))
+	default:
+		panic(fmt.Sprintf("unimplemented extension: %d", ins.Num))
+	}
+}
+
+func loadIndirect(ins LoadIndirect, in []byte, regX uint32) (uint32, bool) {
+	offset := int(ins.Off) + int(regX)
+	size := int(ins.Size)
+
+	return loadCommon(in, offset, size)
+}
+
+func loadMemShift(ins LoadMemShift, in []byte) (uint32, bool) {
+	offset := int(ins.Off)
+
+	if !inBounds(len(in), offset, 0) {
+		return 0, false
+	}
+
+	// Mask off high 4 bits and multiply low 4 bits by 4
+	return uint32(in[offset]&0x0f) * 4, true
+}
+
+func inBounds(inLen int, offset int, size int) bool {
+	return offset+size <= inLen
+}
+
+func loadCommon(in []byte, offset int, size int) (uint32, bool) {
+	if !inBounds(len(in), offset, size) {
+		return 0, false
+	}
+
+	switch size {
+	case 1:
+		return uint32(in[offset]), true
+	case 2:
+		return uint32(binary.BigEndian.Uint16(in[offset : offset+size])), true
+	case 4:
+		return uint32(binary.BigEndian.Uint32(in[offset : offset+size])), true
+	default:
+		panic(fmt.Sprintf("invalid load size: %d", size))
+	}
+}
+
+func loadScratch(ins LoadScratch, regScratch [16]uint32, regA uint32, regX uint32) (uint32, uint32) {
+	switch ins.Dst {
+	case RegA:
+		regA = regScratch[ins.N]
+	case RegX:
+		regX = regScratch[ins.N]
+	}
+
+	return regA, regX
+}
+
+func storeScratch(ins StoreScratch, regScratch [16]uint32, regA uint32, regX uint32) [16]uint32 {
+	switch ins.Src {
+	case RegA:
+		regScratch[ins.N] = regA
+	case RegX:
+		regScratch[ins.N] = regX
+	}
+
+	return regScratch
+}

vendor/golang.org/x/net/bpf/vm_jump_test.go

@@ -0,0 +1,380 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"testing"
+
+	"golang.org/x/net/bpf"
+)
+
+func TestVMJumpOne(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.Jump{
+			Skip: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		1,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpOutOfProgram(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.Jump{
+			Skip: 1,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "cannot jump 1 instructions; jumping past program bounds" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMJumpIfTrueOutOfProgram(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			SkipTrue: 2,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "cannot jump 2 instructions in true case; jumping past program bounds" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMJumpIfFalseOutOfProgram(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.JumpIf{
+			Cond:      bpf.JumpEqual,
+			SkipFalse: 3,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "cannot jump 3 instructions in false case; jumping past program bounds" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMJumpIfEqual(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      1,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		1,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpIfNotEqual(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.JumpIf{
+			Cond:      bpf.JumpNotEqual,
+			Val:       1,
+			SkipFalse: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		1,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpIfGreaterThan(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 4,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpGreaterThan,
+			Val:      0x00010202,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 12,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 4, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpIfLessThan(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 4,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpLessThan,
+			Val:      0xff010203,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 12,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 4, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpIfGreaterOrEqual(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 4,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpGreaterOrEqual,
+			Val:      0x00010203,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 12,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 4, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpIfLessOrEqual(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 4,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpLessOrEqual,
+			Val:      0xff010203,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 12,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 4, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpIfBitsSet(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 2,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpBitsSet,
+			Val:      0x1122,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 10,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0x01, 0x02,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 2, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMJumpIfBitsNotSet(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 2,
+		},
+		bpf.JumpIf{
+			Cond:     bpf.JumpBitsNotSet,
+			Val:      0x1221,
+			SkipTrue: 1,
+		},
+		bpf.RetConstant{
+			Val: 0,
+		},
+		bpf.RetConstant{
+			Val: 10,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0x01, 0x02,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 2, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}

vendor/golang.org/x/net/bpf/vm_load_test.go

@@ -0,0 +1,246 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"net"
+	"testing"
+
+	"golang.org/x/net/bpf"
+	"golang.org/x/net/ipv4"
+)
+
+func TestVMLoadAbsoluteOffsetOutOfBounds(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  100,
+			Size: 2,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1, 2, 3,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMLoadAbsoluteOffsetPlusSizeOutOfBounds(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 2,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMLoadAbsoluteBadInstructionSize(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Size: 5,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "assembling instruction 1: invalid load byte length 0" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMLoadConstantOK(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadConstant{
+			Dst: bpf.RegX,
+			Val: 9,
+		},
+		bpf.TXA{},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMLoadIndirectOutOfBounds(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadIndirect{
+			Off:  100,
+			Size: 1,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMLoadMemShiftOutOfBounds(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadMemShift{
+			Off: 100,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+const (
+	dhcp4Port = 53
+)
+
+func TestVMLoadMemShiftLoadIndirectNoResult(t *testing.T) {
+	vm, in, done := testDHCPv4(t)
+	defer done()
+
+	// Append mostly empty UDP header with incorrect DHCPv4 port
+	in = append(in, []byte{
+		0, 0,
+		0, dhcp4Port + 1,
+		0, 0,
+		0, 0,
+	}...)
+
+	out, err := vm.Run(in)
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 0, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMLoadMemShiftLoadIndirectOK(t *testing.T) {
+	vm, in, done := testDHCPv4(t)
+	defer done()
+
+	// Append mostly empty UDP header with correct DHCPv4 port
+	in = append(in, []byte{
+		0, 0,
+		0, dhcp4Port,
+		0, 0,
+		0, 0,
+	}...)
+
+	out, err := vm.Run(in)
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := len(in)-8, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func testDHCPv4(t *testing.T) (virtualMachine, []byte, func()) {
+	// DHCPv4 test data courtesy of David Anderson:
+	// https://github.com/google/netboot/blob/master/dhcp4/conn_linux.go#L59-L70
+	vm, done, err := testVM(t, []bpf.Instruction{
+		// Load IPv4 packet length
+		bpf.LoadMemShift{Off: 8},
+		// Get UDP dport
+		bpf.LoadIndirect{Off: 8 + 2, Size: 2},
+		// Correct dport?
+		bpf.JumpIf{Cond: bpf.JumpEqual, Val: dhcp4Port, SkipFalse: 1},
+		// Accept
+		bpf.RetConstant{Val: 1500},
+		// Ignore
+		bpf.RetConstant{Val: 0},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+
+	// Minimal requirements to make a valid IPv4 header
+	h := &ipv4.Header{
+		Len: ipv4.HeaderLen,
+		Src: net.IPv4(192, 168, 1, 1),
+		Dst: net.IPv4(192, 168, 1, 2),
+	}
+	hb, err := h.Marshal()
+	if err != nil {
+		t.Fatalf("failed to marshal IPv4 header: %v", err)
+	}
+
+	hb = append([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+	}, hb...)
+
+	return vm, hb, done
+}

vendor/golang.org/x/net/bpf/vm_ret_test.go

@@ -0,0 +1,115 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"testing"
+
+	"golang.org/x/net/bpf"
+)
+
+func TestVMRetA(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		9,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMRetALargerThanInput(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 2,
+		},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 255,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 2, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMRetConstant(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.RetConstant{
+			Val: 9,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 1, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMRetConstantLargerThanInput(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.RetConstant{
+			Val: 16,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0, 1,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 2, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}

vendor/golang.org/x/net/bpf/vm_scratch_test.go

@@ -0,0 +1,247 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"testing"
+
+	"golang.org/x/net/bpf"
+)
+
+func TestVMStoreScratchInvalidScratchRegisterTooSmall(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.StoreScratch{
+			Src: bpf.RegA,
+			N:   -1,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "assembling instruction 1: invalid scratch slot -1" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMStoreScratchInvalidScratchRegisterTooLarge(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.StoreScratch{
+			Src: bpf.RegA,
+			N:   16,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "assembling instruction 1: invalid scratch slot 16" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMStoreScratchUnknownSourceRegister(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.StoreScratch{
+			Src: 100,
+			N:   0,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "assembling instruction 1: invalid source register 100" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMLoadScratchInvalidScratchRegisterTooSmall(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.LoadScratch{
+			Dst: bpf.RegX,
+			N:   -1,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "assembling instruction 1: invalid scratch slot -1" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMLoadScratchInvalidScratchRegisterTooLarge(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.LoadScratch{
+			Dst: bpf.RegX,
+			N:   16,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "assembling instruction 1: invalid scratch slot 16" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMLoadScratchUnknownDestinationRegister(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.LoadScratch{
+			Dst: 100,
+			N:   0,
+		},
+		bpf.RetA{},
+	})
+	if errStr(err) != "assembling instruction 1: invalid target register 100" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMStoreScratchLoadScratchOneValue(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		// Load byte 255
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		// Copy to X and store in scratch[0]
+		bpf.TAX{},
+		bpf.StoreScratch{
+			Src: bpf.RegX,
+			N:   0,
+		},
+		// Load byte 1
+		bpf.LoadAbsolute{
+			Off:  9,
+			Size: 1,
+		},
+		// Overwrite 1 with 255 from scratch[0]
+		bpf.LoadScratch{
+			Dst: bpf.RegA,
+			N:   0,
+		},
+		// Return 255
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		255, 1, 2,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 3, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}
+
+func TestVMStoreScratchLoadScratchMultipleValues(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		// Load byte 10
+		bpf.LoadAbsolute{
+			Off:  8,
+			Size: 1,
+		},
+		// Store in scratch[0]
+		bpf.StoreScratch{
+			Src: bpf.RegA,
+			N:   0,
+		},
+		// Load byte 20
+		bpf.LoadAbsolute{
+			Off:  9,
+			Size: 1,
+		},
+		// Store in scratch[1]
+		bpf.StoreScratch{
+			Src: bpf.RegA,
+			N:   1,
+		},
+		// Load byte 30
+		bpf.LoadAbsolute{
+			Off:  10,
+			Size: 1,
+		},
+		// Store in scratch[2]
+		bpf.StoreScratch{
+			Src: bpf.RegA,
+			N:   2,
+		},
+		// Load byte 1
+		bpf.LoadAbsolute{
+			Off:  11,
+			Size: 1,
+		},
+		// Store in scratch[3]
+		bpf.StoreScratch{
+			Src: bpf.RegA,
+			N:   3,
+		},
+		// Load in byte 10 to X
+		bpf.LoadScratch{
+			Dst: bpf.RegX,
+			N:   0,
+		},
+		// Copy X -> A
+		bpf.TXA{},
+		// Verify value is 10
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      10,
+			SkipTrue: 1,
+		},
+		// Fail test if incorrect
+		bpf.RetConstant{
+			Val: 0,
+		},
+		// Load in byte 20 to A
+		bpf.LoadScratch{
+			Dst: bpf.RegA,
+			N:   1,
+		},
+		// Verify value is 20
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      20,
+			SkipTrue: 1,
+		},
+		// Fail test if incorrect
+		bpf.RetConstant{
+			Val: 0,
+		},
+		// Load in byte 30 to A
+		bpf.LoadScratch{
+			Dst: bpf.RegA,
+			N:   2,
+		},
+		// Verify value is 30
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      30,
+			SkipTrue: 1,
+		},
+		// Fail test if incorrect
+		bpf.RetConstant{
+			Val: 0,
+		},
+		// Return first two bytes on success
+		bpf.RetConstant{
+			Val: 10,
+		},
+	})
+	if err != nil {
+		t.Fatalf("failed to load BPF program: %v", err)
+	}
+	defer done()
+
+	out, err := vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		10, 20, 30, 1,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+	if want, got := 2, out; want != got {
+		t.Fatalf("unexpected number of output bytes:\n- want: %d\n-  got: %d",
+			want, got)
+	}
+}

vendor/golang.org/x/net/bpf/vm_test.go

@@ -0,0 +1,144 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf_test
+
+import (
+	"fmt"
+	"testing"
+
+	"golang.org/x/net/bpf"
+)
+
+var _ bpf.Instruction = unknown{}
+
+type unknown struct{}
+
+func (unknown) Assemble() (bpf.RawInstruction, error) {
+	return bpf.RawInstruction{}, nil
+}
+
+func TestVMUnknownInstruction(t *testing.T) {
+	vm, done, err := testVM(t, []bpf.Instruction{
+		bpf.LoadConstant{
+			Dst: bpf.RegA,
+			Val: 100,
+		},
+		// Should terminate the program with an error immediately
+		unknown{},
+		bpf.RetA{},
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	defer done()
+
+	_, err = vm.Run([]byte{
+		0xff, 0xff, 0xff, 0xff,
+		0xff, 0xff, 0xff, 0xff,
+		0x00, 0x00,
+	})
+	if errStr(err) != "unknown Instruction at index 1: bpf_test.unknown" {
+		t.Fatalf("unexpected error while running program: %v", err)
+	}
+}
+
+func TestVMNoReturnInstruction(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{
+		bpf.LoadConstant{
+			Dst: bpf.RegA,
+			Val: 1,
+		},
+	})
+	if errStr(err) != "BPF program must end with RetA or RetConstant" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestVMNoInputInstructions(t *testing.T) {
+	_, _, err := testVM(t, []bpf.Instruction{})
+	if errStr(err) != "one or more Instructions must be specified" {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+// ExampleNewVM demonstrates usage of a VM, using an Ethernet frame
+// as input and checking its EtherType to determine if it should be accepted.
+func ExampleNewVM() {
+	// Offset | Length | Comment
+	// -------------------------
+	//   00   |   06   | Ethernet destination MAC address
+	//   06   |   06   | Ethernet source MAC address
+	//   12   |   02   | Ethernet EtherType
+	const (
+		etOff = 12
+		etLen = 2
+
+		etARP = 0x0806
+	)
+
+	// Set up a VM to filter traffic based on if its EtherType
+	// matches the ARP EtherType.
+	vm, err := bpf.NewVM([]bpf.Instruction{
+		// Load EtherType value from Ethernet header
+		bpf.LoadAbsolute{
+			Off:  etOff,
+			Size: etLen,
+		},
+		// If EtherType is equal to the ARP EtherType, jump to allow
+		// packet to be accepted
+		bpf.JumpIf{
+			Cond:     bpf.JumpEqual,
+			Val:      etARP,
+			SkipTrue: 1,
+		},
+		// EtherType does not match the ARP EtherType
+		bpf.RetConstant{
+			Val: 0,
+		},
+		// EtherType matches the ARP EtherType, accept up to 1500
+		// bytes of packet
+		bpf.RetConstant{
+			Val: 1500,
+		},
+	})
+	if err != nil {
+		panic(fmt.Sprintf("failed to load BPF program: %v", err))
+	}
+
+	// Create an Ethernet frame with the ARP EtherType for testing
+	frame := []byte{
+		0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+		0x00, 0x11, 0x22, 0x33, 0x44, 0x55,
+		0x08, 0x06,
+		// Payload omitted for brevity
+	}
+
+	// Run our VM's BPF program using the Ethernet frame as input
+	out, err := vm.Run(frame)
+	if err != nil {
+		panic(fmt.Sprintf("failed to accept Ethernet frame: %v", err))
+	}
+
+	// BPF VM can return a byte count greater than the number of input
+	// bytes, so trim the output to match the input byte length
+	if out > len(frame) {
+		out = len(frame)
+	}
+
+	fmt.Printf("out: %d bytes", out)
+
+	// Output:
+	// out: 14 bytes
+}
+
+// errStr returns the string representation of an error, or
+// "<nil>" if it is nil.
+func errStr(err error) string {
+	if err == nil {
+		return "<nil>"
+	}
+
+	return err.Error()
+}

vendor/golang.org/x/net/internal/iana/const.go

@@ -0,0 +1,180 @@
+// go generate gen.go
+// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+// Package iana provides protocol number resources managed by the Internet Assigned Numbers Authority (IANA).
+package iana // import "golang.org/x/net/internal/iana"
+
+// Differentiated Services Field Codepoints (DSCP), Updated: 2013-06-25
+const (
+	DiffServCS0        = 0x0  // CS0
+	DiffServCS1        = 0x20 // CS1
+	DiffServCS2        = 0x40 // CS2
+	DiffServCS3        = 0x60 // CS3
+	DiffServCS4        = 0x80 // CS4
+	DiffServCS5        = 0xa0 // CS5
+	DiffServCS6        = 0xc0 // CS6
+	DiffServCS7        = 0xe0 // CS7
+	DiffServAF11       = 0x28 // AF11
+	DiffServAF12       = 0x30 // AF12
+	DiffServAF13       = 0x38 // AF13
+	DiffServAF21       = 0x48 // AF21
+	DiffServAF22       = 0x50 // AF22
+	DiffServAF23       = 0x58 // AF23
+	DiffServAF31       = 0x68 // AF31
+	DiffServAF32       = 0x70 // AF32
+	DiffServAF33       = 0x78 // AF33
+	DiffServAF41       = 0x88 // AF41
+	DiffServAF42       = 0x90 // AF42
+	DiffServAF43       = 0x98 // AF43
+	DiffServEFPHB      = 0xb8 // EF PHB
+	DiffServVOICEADMIT = 0xb0 // VOICE-ADMIT
+)
+
+// IPv4 TOS Byte and IPv6 Traffic Class Octet, Updated: 2001-09-06
+const (
+	NotECNTransport       = 0x0 // Not-ECT (Not ECN-Capable Transport)
+	ECNTransport1         = 0x1 // ECT(1) (ECN-Capable Transport(1))
+	ECNTransport0         = 0x2 // ECT(0) (ECN-Capable Transport(0))
+	CongestionExperienced = 0x3 // CE (Congestion Experienced)
+)
+
+// Protocol Numbers, Updated: 2015-10-06
+const (
+	ProtocolIP             = 0   // IPv4 encapsulation, pseudo protocol number
+	ProtocolHOPOPT         = 0   // IPv6 Hop-by-Hop Option
+	ProtocolICMP           = 1   // Internet Control Message
+	ProtocolIGMP           = 2   // Internet Group Management
+	ProtocolGGP            = 3   // Gateway-to-Gateway
+	ProtocolIPv4           = 4   // IPv4 encapsulation
+	ProtocolST             = 5   // Stream
+	ProtocolTCP            = 6   // Transmission Control
+	ProtocolCBT            = 7   // CBT
+	ProtocolEGP            = 8   // Exterior Gateway Protocol
+	ProtocolIGP            = 9   // any private interior gateway (used by Cisco for their IGRP)
+	ProtocolBBNRCCMON      = 10  // BBN RCC Monitoring
+	ProtocolNVPII          = 11  // Network Voice Protocol
+	ProtocolPUP            = 12  // PUP
+	ProtocolEMCON          = 14  // EMCON
+	ProtocolXNET           = 15  // Cross Net Debugger
+	ProtocolCHAOS          = 16  // Chaos
+	ProtocolUDP            = 17  // User Datagram
+	ProtocolMUX            = 18  // Multiplexing
+	ProtocolDCNMEAS        = 19  // DCN Measurement Subsystems
+	ProtocolHMP            = 20  // Host Monitoring
+	ProtocolPRM            = 21  // Packet Radio Measurement
+	ProtocolXNSIDP         = 22  // XEROX NS IDP
+	ProtocolTRUNK1         = 23  // Trunk-1
+	ProtocolTRUNK2         = 24  // Trunk-2
+	ProtocolLEAF1          = 25  // Leaf-1
+	ProtocolLEAF2          = 26  // Leaf-2
+	ProtocolRDP            = 27  // Reliable Data Protocol
+	ProtocolIRTP           = 28  // Internet Reliable Transaction
+	ProtocolISOTP4         = 29  // ISO Transport Protocol Class 4
+	ProtocolNETBLT         = 30  // Bulk Data Transfer Protocol
+	ProtocolMFENSP         = 31  // MFE Network Services Protocol
+	ProtocolMERITINP       = 32  // MERIT Internodal Protocol
+	ProtocolDCCP           = 33  // Datagram Congestion Control Protocol
+	Protocol3PC            = 34  // Third Party Connect Protocol
+	ProtocolIDPR           = 35  // Inter-Domain Policy Routing Protocol
+	ProtocolXTP            = 36  // XTP
+	ProtocolDDP            = 37  // Datagram Delivery Protocol
+	ProtocolIDPRCMTP       = 38  // IDPR Control Message Transport Proto
+	ProtocolTPPP           = 39  // TP++ Transport Protocol
+	ProtocolIL             = 40  // IL Transport Protocol
+	ProtocolIPv6           = 41  // IPv6 encapsulation
+	ProtocolSDRP           = 42  // Source Demand Routing Protocol
+	ProtocolIPv6Route      = 43  // Routing Header for IPv6
+	ProtocolIPv6Frag       = 44  // Fragment Header for IPv6
+	ProtocolIDRP           = 45  // Inter-Domain Routing Protocol
+	ProtocolRSVP           = 46  // Reservation Protocol
+	ProtocolGRE            = 47  // Generic Routing Encapsulation
+	ProtocolDSR            = 48  // Dynamic Source Routing Protocol
+	ProtocolBNA            = 49  // BNA
+	ProtocolESP            = 50  // Encap Security Payload
+	ProtocolAH             = 51  // Authentication Header
+	ProtocolINLSP          = 52  // Integrated Net Layer Security  TUBA
+	ProtocolNARP           = 54  // NBMA Address Resolution Protocol
+	ProtocolMOBILE         = 55  // IP Mobility
+	ProtocolTLSP           = 56  // Transport Layer Security Protocol using Kryptonet key management
+	ProtocolSKIP           = 57  // SKIP
+	ProtocolIPv6ICMP       = 58  // ICMP for IPv6
+	ProtocolIPv6NoNxt      = 59  // No Next Header for IPv6
+	ProtocolIPv6Opts       = 60  // Destination Options for IPv6
+	ProtocolCFTP           = 62  // CFTP
+	ProtocolSATEXPAK       = 64  // SATNET and Backroom EXPAK
+	ProtocolKRYPTOLAN      = 65  // Kryptolan
+	ProtocolRVD            = 66  // MIT Remote Virtual Disk Protocol
+	ProtocolIPPC           = 67  // Internet Pluribus Packet Core
+	ProtocolSATMON         = 69  // SATNET Monitoring
+	ProtocolVISA           = 70  // VISA Protocol
+	ProtocolIPCV           = 71  // Internet Packet Core Utility
+	ProtocolCPNX           = 72  // Computer Protocol Network Executive
+	ProtocolCPHB           = 73  // Computer Protocol Heart Beat
+	ProtocolWSN            = 74  // Wang Span Network
+	ProtocolPVP            = 75  // Packet Video Protocol
+	ProtocolBRSATMON       = 76  // Backroom SATNET Monitoring
+	ProtocolSUNND          = 77  // SUN ND PROTOCOL-Temporary
+	ProtocolWBMON          = 78  // WIDEBAND Monitoring
+	ProtocolWBEXPAK        = 79  // WIDEBAND EXPAK
+	ProtocolISOIP          = 80  // ISO Internet Protocol
+	ProtocolVMTP           = 81  // VMTP
+	ProtocolSECUREVMTP     = 82  // SECURE-VMTP
+	ProtocolVINES          = 83  // VINES
+	ProtocolTTP            = 84  // Transaction Transport Protocol
+	ProtocolIPTM           = 84  // Internet Protocol Traffic Manager
+	ProtocolNSFNETIGP      = 85  // NSFNET-IGP
+	ProtocolDGP            = 86  // Dissimilar Gateway Protocol
+	ProtocolTCF            = 87  // TCF
+	ProtocolEIGRP          = 88  // EIGRP
+	ProtocolOSPFIGP        = 89  // OSPFIGP
+	ProtocolSpriteRPC      = 90  // Sprite RPC Protocol
+	ProtocolLARP           = 91  // Locus Address Resolution Protocol
+	ProtocolMTP            = 92  // Multicast Transport Protocol
+	ProtocolAX25           = 93  // AX.25 Frames
+	ProtocolIPIP           = 94  // IP-within-IP Encapsulation Protocol
+	ProtocolSCCSP          = 96  // Semaphore Communications Sec. Pro.
+	ProtocolETHERIP        = 97  // Ethernet-within-IP Encapsulation
+	ProtocolENCAP          = 98  // Encapsulation Header
+	ProtocolGMTP           = 100 // GMTP
+	ProtocolIFMP           = 101 // Ipsilon Flow Management Protocol
+	ProtocolPNNI           = 102 // PNNI over IP
+	ProtocolPIM            = 103 // Protocol Independent Multicast
+	ProtocolARIS           = 104 // ARIS
+	ProtocolSCPS           = 105 // SCPS
+	ProtocolQNX            = 106 // QNX
+	ProtocolAN             = 107 // Active Networks
+	ProtocolIPComp         = 108 // IP Payload Compression Protocol
+	ProtocolSNP            = 109 // Sitara Networks Protocol
+	ProtocolCompaqPeer     = 110 // Compaq Peer Protocol
+	ProtocolIPXinIP        = 111 // IPX in IP
+	ProtocolVRRP           = 112 // Virtual Router Redundancy Protocol
+	ProtocolPGM            = 113 // PGM Reliable Transport Protocol
+	ProtocolL2TP           = 115 // Layer Two Tunneling Protocol
+	ProtocolDDX            = 116 // D-II Data Exchange (DDX)
+	ProtocolIATP           = 117 // Interactive Agent Transfer Protocol
+	ProtocolSTP            = 118 // Schedule Transfer Protocol
+	ProtocolSRP            = 119 // SpectraLink Radio Protocol
+	ProtocolUTI            = 120 // UTI
+	ProtocolSMP            = 121 // Simple Message Protocol
+	ProtocolPTP            = 123 // Performance Transparency Protocol
+	ProtocolISIS           = 124 // ISIS over IPv4
+	ProtocolFIRE           = 125 // FIRE
+	ProtocolCRTP           = 126 // Combat Radio Transport Protocol
+	ProtocolCRUDP          = 127 // Combat Radio User Datagram
+	ProtocolSSCOPMCE       = 128 // SSCOPMCE
+	ProtocolIPLT           = 129 // IPLT
+	ProtocolSPS            = 130 // Secure Packet Shield
+	ProtocolPIPE           = 131 // Private IP Encapsulation within IP
+	ProtocolSCTP           = 132 // Stream Control Transmission Protocol
+	ProtocolFC             = 133 // Fibre Channel
+	ProtocolRSVPE2EIGNORE  = 134 // RSVP-E2E-IGNORE
+	ProtocolMobilityHeader = 135 // Mobility Header
+	ProtocolUDPLite        = 136 // UDPLite
+	ProtocolMPLSinIP       = 137 // MPLS-in-IP
+	ProtocolMANET          = 138 // MANET Protocols
+	ProtocolHIP            = 139 // Host Identity Protocol
+	ProtocolShim6          = 140 // Shim6 Protocol
+	ProtocolWESP           = 141 // Wrapped Encapsulating Security Payload
+	ProtocolROHC           = 142 // Robust Header Compression
+	ProtocolReserved       = 255 // Reserved
+)

vendor/golang.org/x/net/internal/iana/gen.go

@@ -0,0 +1,293 @@
+// Copyright 2013 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+//go:generate go run gen.go
+
+// This program generates internet protocol constants and tables by
+// reading IANA protocol registries.
+package main
+
+import (
+	"bytes"
+	"encoding/xml"
+	"fmt"
+	"go/format"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+)
+
+var registries = []struct {
+	url   string
+	parse func(io.Writer, io.Reader) error
+}{
+	{
+		"http://www.iana.org/assignments/dscp-registry/dscp-registry.xml",
+		parseDSCPRegistry,
+	},
+	{
+		"http://www.iana.org/assignments/ipv4-tos-byte/ipv4-tos-byte.xml",
+		parseTOSTCByte,
+	},
+	{
+		"http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml",
+		parseProtocolNumbers,
+	},
+}
+
+func main() {
+	var bb bytes.Buffer
+	fmt.Fprintf(&bb, "// go generate gen.go\n")
+	fmt.Fprintf(&bb, "// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n")
+	fmt.Fprintf(&bb, "// Package iana provides protocol number resources managed by the Internet Assigned Numbers Authority (IANA).\n")
+	fmt.Fprintf(&bb, `package iana // import "golang.org/x/net/internal/iana"`+"\n\n")
+	for _, r := range registries {
+		resp, err := http.Get(r.url)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			fmt.Fprintf(os.Stderr, "got HTTP status code %v for %v\n", resp.StatusCode, r.url)
+			os.Exit(1)
+		}
+		if err := r.parse(&bb, resp.Body); err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+		fmt.Fprintf(&bb, "\n")
+	}
+	b, err := format.Source(bb.Bytes())
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := ioutil.WriteFile("const.go", b, 0644); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func parseDSCPRegistry(w io.Writer, r io.Reader) error {
+	dec := xml.NewDecoder(r)
+	var dr dscpRegistry
+	if err := dec.Decode(&dr); err != nil {
+		return err
+	}
+	drs := dr.escape()
+	fmt.Fprintf(w, "// %s, Updated: %s\n", dr.Title, dr.Updated)
+	fmt.Fprintf(w, "const (\n")
+	for _, dr := range drs {
+		fmt.Fprintf(w, "DiffServ%s = %#x", dr.Name, dr.Value)
+		fmt.Fprintf(w, "// %s\n", dr.OrigName)
+	}
+	fmt.Fprintf(w, ")\n")
+	return nil
+}
+
+type dscpRegistry struct {
+	XMLName     xml.Name `xml:"registry"`
+	Title       string   `xml:"title"`
+	Updated     string   `xml:"updated"`
+	Note        string   `xml:"note"`
+	RegTitle    string   `xml:"registry>title"`
+	PoolRecords []struct {
+		Name  string `xml:"name"`
+		Space string `xml:"space"`
+	} `xml:"registry>record"`
+	Records []struct {
+		Name  string `xml:"name"`
+		Space string `xml:"space"`
+	} `xml:"registry>registry>record"`
+}
+
+type canonDSCPRecord struct {
+	OrigName string
+	Name     string
+	Value    int
+}
+
+func (drr *dscpRegistry) escape() []canonDSCPRecord {
+	drs := make([]canonDSCPRecord, len(drr.Records))
+	sr := strings.NewReplacer(
+		"+", "",
+		"-", "",
+		"/", "",
+		".", "",
+		" ", "",
+	)
+	for i, dr := range drr.Records {
+		s := strings.TrimSpace(dr.Name)
+		drs[i].OrigName = s
+		drs[i].Name = sr.Replace(s)
+		n, err := strconv.ParseUint(dr.Space, 2, 8)
+		if err != nil {
+			continue
+		}
+		drs[i].Value = int(n) << 2
+	}
+	return drs
+}
+
+func parseTOSTCByte(w io.Writer, r io.Reader) error {
+	dec := xml.NewDecoder(r)
+	var ttb tosTCByte
+	if err := dec.Decode(&ttb); err != nil {
+		return err
+	}
+	trs := ttb.escape()
+	fmt.Fprintf(w, "// %s, Updated: %s\n", ttb.Title, ttb.Updated)
+	fmt.Fprintf(w, "const (\n")
+	for _, tr := range trs {
+		fmt.Fprintf(w, "%s = %#x", tr.Keyword, tr.Value)
+		fmt.Fprintf(w, "// %s\n", tr.OrigKeyword)
+	}
+	fmt.Fprintf(w, ")\n")
+	return nil
+}
+
+type tosTCByte struct {
+	XMLName  xml.Name `xml:"registry"`
+	Title    string   `xml:"title"`
+	Updated  string   `xml:"updated"`
+	Note     string   `xml:"note"`
+	RegTitle string   `xml:"registry>title"`
+	Records  []struct {
+		Binary  string `xml:"binary"`
+		Keyword string `xml:"keyword"`
+	} `xml:"registry>record"`
+}
+
+type canonTOSTCByteRecord struct {
+	OrigKeyword string
+	Keyword     string
+	Value       int
+}
+
+func (ttb *tosTCByte) escape() []canonTOSTCByteRecord {
+	trs := make([]canonTOSTCByteRecord, len(ttb.Records))
+	sr := strings.NewReplacer(
+		"Capable", "",
+		"(", "",
+		")", "",
+		"+", "",
+		"-", "",
+		"/", "",
+		".", "",
+		" ", "",
+	)
+	for i, tr := range ttb.Records {
+		s := strings.TrimSpace(tr.Keyword)
+		trs[i].OrigKeyword = s
+		ss := strings.Split(s, " ")
+		if len(ss) > 1 {
+			trs[i].Keyword = strings.Join(ss[1:], " ")
+		} else {
+			trs[i].Keyword = ss[0]
+		}
+		trs[i].Keyword = sr.Replace(trs[i].Keyword)
+		n, err := strconv.ParseUint(tr.Binary, 2, 8)
+		if err != nil {
+			continue
+		}
+		trs[i].Value = int(n)
+	}
+	return trs
+}
+
+func parseProtocolNumbers(w io.Writer, r io.Reader) error {
+	dec := xml.NewDecoder(r)
+	var pn protocolNumbers
+	if err := dec.Decode(&pn); err != nil {
+		return err
+	}
+	prs := pn.escape()
+	prs = append([]canonProtocolRecord{{
+		Name:  "IP",
+		Descr: "IPv4 encapsulation, pseudo protocol number",
+		Value: 0,
+	}}, prs...)
+	fmt.Fprintf(w, "// %s, Updated: %s\n", pn.Title, pn.Updated)
+	fmt.Fprintf(w, "const (\n")
+	for _, pr := range prs {
+		if pr.Name == "" {
+			continue
+		}
+		fmt.Fprintf(w, "Protocol%s = %d", pr.Name, pr.Value)
+		s := pr.Descr
+		if s == "" {
+			s = pr.OrigName
+		}
+		fmt.Fprintf(w, "// %s\n", s)
+	}
+	fmt.Fprintf(w, ")\n")
+	return nil
+}
+
+type protocolNumbers struct {
+	XMLName  xml.Name `xml:"registry"`
+	Title    string   `xml:"title"`
+	Updated  string   `xml:"updated"`
+	RegTitle string   `xml:"registry>title"`
+	Note     string   `xml:"registry>note"`
+	Records  []struct {
+		Value string `xml:"value"`
+		Name  string `xml:"name"`
+		Descr string `xml:"description"`
+	} `xml:"registry>record"`
+}
+
+type canonProtocolRecord struct {
+	OrigName string
+	Name     string
+	Descr    string
+	Value    int
+}
+
+func (pn *protocolNumbers) escape() []canonProtocolRecord {
+	prs := make([]canonProtocolRecord, len(pn.Records))
+	sr := strings.NewReplacer(
+		"-in-", "in",
+		"-within-", "within",
+		"-over-", "over",
+		"+", "P",
+		"-", "",
+		"/", "",
+		".", "",
+		" ", "",
+	)
+	for i, pr := range pn.Records {
+		if strings.Contains(pr.Name, "Deprecated") ||
+			strings.Contains(pr.Name, "deprecated") {
+			continue
+		}
+		prs[i].OrigName = pr.Name
+		s := strings.TrimSpace(pr.Name)
+		switch pr.Name {
+		case "ISIS over IPv4":
+			prs[i].Name = "ISIS"
+		case "manet":
+			prs[i].Name = "MANET"
+		default:
+			prs[i].Name = sr.Replace(s)
+		}
+		ss := strings.Split(pr.Descr, "\n")
+		for i := range ss {
+			ss[i] = strings.TrimSpace(ss[i])
+		}
+		if len(ss) > 1 {
+			prs[i].Descr = strings.Join(ss, " ")
+		} else {
+			prs[i].Descr = ss[0]
+		}
+		prs[i].Value, _ = strconv.Atoi(pr.Value)
+	}
+	return prs
+}

vendor/golang.org/x/net/ipv4/bpf_test.go

@@ -0,0 +1,93 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv4_test
+
+import (
+	"net"
+	"runtime"
+	"testing"
+	"time"
+
+	"golang.org/x/net/bpf"
+	"golang.org/x/net/ipv4"
+)
+
+func TestBPF(t *testing.T) {
+	if runtime.GOOS != "linux" {
+		t.Skipf("not supported on %s", runtime.GOOS)
+	}
+
+	l, err := net.ListenPacket("udp4", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer l.Close()
+
+	p := ipv4.NewPacketConn(l)
+
+	// This filter accepts UDP packets whose first payload byte is
+	// even.
+	prog, err := bpf.Assemble([]bpf.Instruction{
+		// Load the first byte of the payload (skipping UDP header).
+		bpf.LoadAbsolute{Off: 8, Size: 1},
+		// Select LSB of the byte.
+		bpf.ALUOpConstant{Op: bpf.ALUOpAnd, Val: 1},
+		// Byte is even?
+		bpf.JumpIf{Cond: bpf.JumpEqual, Val: 0, SkipFalse: 1},
+		// Accept.
+		bpf.RetConstant{Val: 4096},
+		// Ignore.
+		bpf.RetConstant{Val: 0},
+	})
+	if err != nil {
+		t.Fatalf("compiling BPF: %s", err)
+	}
+
+	if err = p.SetBPF(prog); err != nil {
+		t.Fatalf("attaching filter to Conn: %s", err)
+	}
+
+	s, err := net.Dial("udp4", l.LocalAddr().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer s.Close()
+	go func() {
+		for i := byte(0); i < 10; i++ {
+			s.Write([]byte{i})
+		}
+	}()
+
+	l.SetDeadline(time.Now().Add(2 * time.Second))
+	seen := make([]bool, 5)
+	for {
+		var b [512]byte
+		n, _, err := l.ReadFrom(b[:])
+		if err != nil {
+			t.Fatalf("reading from listener: %s", err)
+		}
+		if n != 1 {
+			t.Fatalf("unexpected packet length, want 1, got %d", n)
+		}
+		if b[0] >= 10 {
+			t.Fatalf("unexpected byte, want 0-9, got %d", b[0])
+		}
+		if b[0]%2 != 0 {
+			t.Fatalf("got odd byte %d, wanted only even bytes", b[0])
+		}
+		seen[b[0]/2] = true
+
+		seenAll := true
+		for _, v := range seen {
+			if !v {
+				seenAll = false
+				break
+			}
+		}
+		if seenAll {
+			break
+		}
+	}
+}

vendor/golang.org/x/net/ipv4/bpfopt_linux.go

@@ -0,0 +1,27 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv4
+
+import (
+	"os"
+	"unsafe"
+
+	"golang.org/x/net/bpf"
+)
+
+// SetBPF attaches a BPF program to the connection.
+//
+// Only supported on Linux.
+func (c *dgramOpt) SetBPF(filter []bpf.RawInstruction) error {
+	fd, err := c.sysfd()
+	if err != nil {
+		return err
+	}
+	prog := sysSockFProg{
+		Len:    uint16(len(filter)),
+		Filter: (*sysSockFilter)(unsafe.Pointer(&filter[0])),
+	}
+	return os.NewSyscallError("setsockopt", setsockopt(fd, sysSOL_SOCKET, sysSO_ATTACH_FILTER, unsafe.Pointer(&prog), uint32(unsafe.Sizeof(prog))))
+}

vendor/golang.org/x/net/ipv4/bpfopt_stub.go

@@ -0,0 +1,16 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !linux
+
+package ipv4
+
+import "golang.org/x/net/bpf"
+
+// SetBPF attaches a BPF program to the connection.
+//
+// Only supported on Linux.
+func (c *dgramOpt) SetBPF(filter []bpf.RawInstruction) error {
+	return errOpNoSupport
+}

vendor/golang.org/x/net/ipv4/control.go

@@ -0,0 +1,70 @@
+// Copyright 2012 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv4
+
+import (
+	"fmt"
+	"net"
+	"sync"
+)
+
+type rawOpt struct {
+	sync.RWMutex
+	cflags ControlFlags
+}
+
+func (c *rawOpt) set(f ControlFlags)        { c.cflags |= f }
+func (c *rawOpt) clear(f ControlFlags)      { c.cflags &^= f }
+func (c *rawOpt) isset(f ControlFlags) bool { return c.cflags&f != 0 }
+
+type ControlFlags uint
+
+const (
+	FlagTTL       ControlFlags = 1 << iota // pass the TTL on the received packet
+	FlagSrc                                // pass the source address on the received packet
+	FlagDst                                // pass the destination address on the received packet
+	FlagInterface                          // pass the interface index on the received packet
+)
+
+// A ControlMessage represents per packet basis IP-level socket options.
+type ControlMessage struct {
+	// Receiving socket options: SetControlMessage allows to
+	// receive the options from the protocol stack using ReadFrom
+	// method of PacketConn or RawConn.
+	//
+	// Specifying socket options: ControlMessage for WriteTo
+	// method of PacketConn or RawConn allows to send the options
+	// to the protocol stack.
+	//
+	TTL     int    // time-to-live, receiving only
+	Src     net.IP // source address, specifying only
+	Dst     net.IP // destination address, receiving only
+	IfIndex int    // interface index, must be 1 <= value when specifying
+}
+
+func (cm *ControlMessage) String() string {
+	if cm == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("ttl=%d src=%v dst=%v ifindex=%d", cm.TTL, cm.Src, cm.Dst, cm.IfIndex)
+}
+
+// Ancillary data socket options
+const (
+	ctlTTL        = iota // header field
+	ctlSrc               // header field
+	ctlDst               // header field
+	ctlInterface         // inbound or outbound interface
+	ctlPacketInfo        // inbound or outbound packet path
+	ctlMax
+)
+
+// A ctlOpt represents a binding for ancillary data socket option.
+type ctlOpt struct {
+	name    int // option name, must be equal or greater than 1
+	length  int // option length
+	marshal func([]byte, *ControlMessage) []byte
+	parse   func(*ControlMessage, []byte)
+}

vendor/golang.org/x/net/ipv4/control_bsd.go

@@ -0,0 +1,40 @@
+// Copyright 2012 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package ipv4
+
+import (
+	"net"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/net/internal/iana"
+)
+
+func marshalDst(b []byte, cm *ControlMessage) []byte {
+	m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
+	m.Level = iana.ProtocolIP
+	m.Type = sysIP_RECVDSTADDR
+	m.SetLen(syscall.CmsgLen(net.IPv4len))
+	return b[syscall.CmsgSpace(net.IPv4len):]
+}
+
+func parseDst(cm *ControlMessage, b []byte) {
+	cm.Dst = b[:net.IPv4len]
+}
+
+func marshalInterface(b []byte, cm *ControlMessage) []byte {
+	m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
+	m.Level = iana.ProtocolIP
+	m.Type = sysIP_RECVIF
+	m.SetLen(syscall.CmsgLen(syscall.SizeofSockaddrDatalink))
+	return b[syscall.CmsgSpace(syscall.SizeofSockaddrDatalink):]
+}
+
+func parseInterface(cm *ControlMessage, b []byte) {
+	sadl := (*syscall.SockaddrDatalink)(unsafe.Pointer(&b[0]))
+	cm.IfIndex = int(sadl.Index)
+}

vendor/golang.org/x/net/ipv4/control_pktinfo.go

@@ -0,0 +1,37 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin linux
+
+package ipv4
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/net/internal/iana"
+)
+
+func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
+	m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
+	m.Level = iana.ProtocolIP
+	m.Type = sysIP_PKTINFO
+	m.SetLen(syscall.CmsgLen(sysSizeofInetPktinfo))
+	if cm != nil {
+		pi := (*sysInetPktinfo)(unsafe.Pointer(&b[syscall.CmsgLen(0)]))
+		if ip := cm.Src.To4(); ip != nil {
+			copy(pi.Spec_dst[:], ip)
+		}
+		if cm.IfIndex > 0 {
+			pi.setIfindex(cm.IfIndex)
+		}
+	}
+	return b[syscall.CmsgSpace(sysSizeofInetPktinfo):]
+}
+
+func parsePacketInfo(cm *ControlMessage, b []byte) {
+	pi := (*sysInetPktinfo)(unsafe.Pointer(&b[0]))
+	cm.IfIndex = int(pi.Ifindex)
+	cm.Dst = pi.Addr[:]
+}