
This adds basic plugins. "main" types: veth, bridge, macvlan "ipam" type: host-local The code has been ported over from github.com/coreos/rkt project and adapted to fit the CNI spec.
186 lines
4.1 KiB
Go
186 lines
4.1 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"fmt"
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"net"
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"github.com/appc/cni/pkg/ip"
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"github.com/appc/cni/pkg/plugin"
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"github.com/appc/cni/plugins/ipam/host-local/backend"
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)
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type IPAllocator struct {
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start net.IP
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end net.IP
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conf *IPAMConfig
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store backend.Store
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}
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func NewIPAllocator(conf *IPAMConfig, store backend.Store) (*IPAllocator, error) {
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var (
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start net.IP
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end net.IP
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err error
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)
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start, end, err = networkRange((*net.IPNet)(&conf.Subnet))
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if err != nil {
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return nil, err
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}
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// skip the .0 address
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start = ip.NextIP(start)
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if conf.RangeStart != nil {
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if err := validateRangeIP(conf.RangeStart, (*net.IPNet)(&conf.Subnet)); err != nil {
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return nil, err
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}
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start = conf.RangeStart
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}
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if conf.RangeEnd != nil {
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if err := validateRangeIP(conf.RangeEnd, (*net.IPNet)(&conf.Subnet)); err != nil {
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return nil, err
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}
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// RangeEnd is inclusive
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end = ip.NextIP(conf.RangeEnd)
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}
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return &IPAllocator{start, end, conf, store}, nil
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}
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func validateRangeIP(ip net.IP, ipnet *net.IPNet) error {
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if !ipnet.Contains(ip) {
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return fmt.Errorf("%s not in network: %s", ip, ipnet)
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}
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return nil
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}
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// Returns newly allocated IP along with its config
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func (a *IPAllocator) Get(id string) (*plugin.IPConfig, error) {
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a.store.Lock()
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defer a.store.Unlock()
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gw := a.conf.Gateway
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if gw == nil {
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gw = ip.NextIP(a.conf.Subnet.IP)
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}
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for cur := a.start; !cur.Equal(a.end); cur = ip.NextIP(cur) {
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// don't allocate gateway IP
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if gw != nil && cur.Equal(gw) {
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continue
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}
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reserved, err := a.store.Reserve(id, cur)
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if err != nil {
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return nil, err
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}
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if reserved {
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return &plugin.IPConfig{
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IP: net.IPNet{cur, a.conf.Subnet.Mask},
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Gateway: gw,
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Routes: a.conf.Routes,
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}, nil
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}
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}
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return nil, fmt.Errorf("no IP addresses available in network: %s", a.conf.Name)
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}
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// Allocates both an IP and the Gateway IP, i.e. a /31
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// This is used for Point-to-Point links
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func (a *IPAllocator) GetPtP(id string) (*plugin.IPConfig, error) {
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a.store.Lock()
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defer a.store.Unlock()
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for cur := a.start; !cur.Equal(a.end); cur = ip.NextIP(cur) {
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// we're looking for unreserved even, odd pair
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if !evenIP(cur) {
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continue
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}
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gw := cur
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reserved, err := a.store.Reserve(id, gw)
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if err != nil {
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return nil, err
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}
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if reserved {
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cur = ip.NextIP(cur)
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if cur.Equal(a.end) {
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break
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}
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reserved, err := a.store.Reserve(id, cur)
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if err != nil {
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return nil, err
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}
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if reserved {
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// found them both!
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_, bits := a.conf.Subnet.Mask.Size()
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mask := net.CIDRMask(bits-1, bits)
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return &plugin.IPConfig{
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IP: net.IPNet{cur, mask},
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Gateway: gw,
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Routes: a.conf.Routes,
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}, nil
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}
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}
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}
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return nil, fmt.Errorf("no ip addresses available in network: %s", a.conf.Name)
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}
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// Releases all IPs allocated for the container with given ID
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func (a *IPAllocator) Release(id string) error {
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a.store.Lock()
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defer a.store.Unlock()
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return a.store.ReleaseByID(id)
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}
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func networkRange(ipnet *net.IPNet) (net.IP, net.IP, error) {
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ip := ipnet.IP.To4()
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if ip == nil {
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ip = ipnet.IP.To16()
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if ip == nil {
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return nil, nil, fmt.Errorf("IP not v4 nor v6")
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}
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}
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if len(ip) != len(ipnet.Mask) {
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return nil, nil, fmt.Errorf("IPNet IP and Mask version mismatch")
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}
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var end net.IP
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for i := 0; i < len(ip); i++ {
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end = append(end, ip[i]|^ipnet.Mask[i])
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}
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return ipnet.IP, end, nil
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}
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func evenIP(ip net.IP) bool {
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i := ip.To4()
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if i == nil {
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i = ip.To16()
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if i == nil {
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panic("IP is not v4 or v6")
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}
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}
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return i[len(i)-1]%2 == 0
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}
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