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bridge: Add macspoofchk support

Browse Source 
The new macspoofchk field is added to the bridge plugin to support
anti-mac-spoofing.
When the parameter is enabled, traffic is limited to the mac addresses
of the container interface (the veth peer that is placed in the
container ns).
Any traffic that exits the pod is checked against the source mac address
that is expected. If the mac address is different, the frames are
dropped.

The implementation is using nftables and should only be used on nodes
that support it.

Signed-off-by: Edward Haas <edwardh@redhat.com>
This commit is contained in:
Edward Haas 2021-06-15 21:12:57 +03:00
parent 8632ace977
commit 081ed44a1d
24 changed files with 2132 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
.github/workflows/test.yaml vendored
View File

@ -35,6 +35,9 @@ jobs:
run: |
sudo apt-get update
sudo apt-get install linux-modules-extra-$(uname -r)
- name: Install nftables
run: sudo apt-get install nftables
- name: setup go
uses: actions/setup-go@v2
with:

1
go.mod
View File

@ -15,6 +15,7 @@ require (
github.com/godbus/dbus/v5 v5.0.4
github.com/j-keck/arping v1.0.2
github.com/mattn/go-shellwords v1.0.12
github.com/networkplumbing/go-nft v0.2.0
github.com/onsi/ginkgo v1.16.4
github.com/onsi/gomega v1.15.0
github.com/safchain/ethtool v0.0.0-20210803160452-9aa261dae9b1

12
go.sum
View File

@ -436,6 +436,8 @@ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8m
github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+o7JKHSa8/e818NopupXU1YMK5fe1lsApnBw=
github.com/ncw/swift v1.0.47/go.mod h1:23YIA4yWVnGwv2dQlN4bB7egfYX6YLn0Yo/S6zZO/ZM=
github.com/networkplumbing/go-nft v0.2.0 h1:eKapmyVUt/3VGfhYaDos5yeprm+LPt881UeksmKKZHY=
github.com/networkplumbing/go-nft v0.2.0/go.mod h1:HnnM+tYvlGAsMU7yoYwXEVLLiDW9gdMmb5HoGcwpuQs=
github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
@ -565,8 +567,9 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/syndtr/gocapability v0.0.0-20170704070218-db04d3cc01c8/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=
github.com/syndtr/gocapability v0.0.0-20180916011248-d98352740cb2/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=
github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635/go.mod h1:hkRG7XYTFWNJGYcbNJQlaLq0fg1yr4J4t/NcTQtrfww=
@ -597,6 +600,7 @@ github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q
github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
github.com/yvasiyarov/go-metrics v0.0.0-20140926110328-57bccd1ccd43/go.mod h1:aX5oPXxHm3bOH+xeAttToC8pqch2ScQN/JoXYupl6xs=
github.com/yvasiyarov/gorelic v0.0.0-20141212073537-a9bba5b9ab50/go.mod h1:NUSPSUX/bi6SeDMUh6brw0nXpxHnc96TguQh0+r/ssA=
github.com/yvasiyarov/newrelic_platform_go v0.0.0-20140908184405-b21fdbd4370f/go.mod h1:GlGEuHIJweS1mbCqG+7vt2nvWLzLLnRHbXz5JKd/Qbg=
@ -657,6 +661,7 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@ -692,6 +697,7 @@ golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwY
golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/net v0.0.0-20201224014010-6772e930b67b/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 h1:DzZ89McO9/gWPsQXS/FVKAlG02ZjaQ6AlZRBimEYOd0=
golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@ -708,6 +714,7 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@ -769,7 +776,9 @@ golang.org/x/sys v0.0.0-20201202213521-69691e467435/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210324051608-47abb6519492/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e h1:WUoyKPm6nCo1BnNUvPGnFG3T5DUVem42yDJZZ4CNxMA=
golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
@ -824,6 +833,7 @@ golang.org/x/tools v0.0.0-20200304193943-95d2e580d8eb/go.mod h1:o4KQGtdN14AW+yjs
golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
golang.org/x/tools v0.1.4/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

27
pkg/link/link_suite_test.go Normal file
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@ -0,0 +1,27 @@
// Copyright 2021 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 link_test
import (
"testing"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
func TestIp(t *testing.T) {
RegisterFailHandler(Fail)
RunSpecs(t, "pkg/link")
}

245
pkg/link/spoofcheck.go Normal file
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@ -0,0 +1,245 @@
// Copyright 2021 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 link
import (
"fmt"
"os"
"github.com/networkplumbing/go-nft/nft"
"github.com/networkplumbing/go-nft/nft/schema"
)
const (
natTableName = "nat"
preRoutingBaseChainName = "PREROUTING"
)
type NftConfigurer interface {
Apply(*nft.Config) error
Read() (*nft.Config, error)
}
type SpoofChecker struct {
iface string
macAddress string
refID string
configurer NftConfigurer
}
type defaultNftConfigurer struct{}
func (_ defaultNftConfigurer) Apply(cfg *nft.Config) error {
return nft.ApplyConfig(cfg)
}
func (_ defaultNftConfigurer) Read() (*nft.Config, error) {
return nft.ReadConfig()
}
func NewSpoofChecker(iface, macAddress, refID string) *SpoofChecker {
return NewSpoofCheckerWithConfigurer(iface, macAddress, refID, defaultNftConfigurer{})
}
func NewSpoofCheckerWithConfigurer(iface, macAddress, refID string, configurer NftConfigurer) *SpoofChecker {
return &SpoofChecker{iface, macAddress, refID, configurer}
}
// Setup applies nftables configuration to restrict traffic
// from the provided interface. Only traffic with the mentioned mac address
// is allowed to pass, all others are blocked.
// The configuration follows the format libvirt and ebtables implemented, allowing
// extensions to the rules in the future.
// refID is used to label the rules with a unique comment, identifying the rule-set.
//
// In order to take advantage of the nftables configuration change atomicity, the
// following steps are taken to apply the configuration:
// - Declare the table and chains (they will be created in case not present).
// - Apply the rules, while first flushing the iface/mac specific regular chain rules.
// Two transactions are used because the flush succeeds only if the table/chain it targets
// exists. This avoids the need to query the existing state and acting upon it (a raceful pattern).
// Although two transactions are taken place, only the 2nd one where the rules
// are added has a real impact on the system.
func (sc *SpoofChecker) Setup() error {
baseConfig := nft.NewConfig()
baseConfig.AddTable(&schema.Table{Family: schema.FamilyBridge, Name: natTableName})
baseConfig.AddChain(sc.baseChain())
ifaceChain := sc.ifaceChain()
baseConfig.AddChain(ifaceChain)
macChain := sc.macChain(ifaceChain.Name)
baseConfig.AddChain(macChain)
if err := sc.configurer.Apply(baseConfig); err != nil {
return fmt.Errorf("failed to setup spoof-check: %v", err)
}
rulesConfig := nft.NewConfig()
rulesConfig.FlushChain(ifaceChain)
rulesConfig.FlushChain(macChain)
rulesConfig.AddRule(sc.matchIfaceJumpToChainRule(preRoutingBaseChainName, ifaceChain.Name))
rulesConfig.AddRule(sc.jumpToChainRule(ifaceChain.Name, macChain.Name))
rulesConfig.AddRule(sc.matchMacRule(macChain.Name))
rulesConfig.AddRule(sc.dropRule(macChain.Name))
if err := sc.configurer.Apply(rulesConfig); err != nil {
return fmt.Errorf("failed to setup spoof-check: %v", err)
}
return nil
}
// Teardown removes the interface and mac-address specific chains and their rules.
// The table and base-chain are expected to survive while the base-chain rule that matches the
// interface is removed.
func (sc *SpoofChecker) Teardown() error {
ifaceChain := sc.ifaceChain()
currentConfig, ifaceMatchRuleErr := sc.configurer.Read()
if ifaceMatchRuleErr == nil {
expectedRuleToFind := sc.matchIfaceJumpToChainRule(preRoutingBaseChainName, ifaceChain.Name)
// It is safer to exclude the statement matching, avoiding cases where a current statement includes
// additional default entries (e.g. counters).
ruleToFindExcludingStatements := *expectedRuleToFind
ruleToFindExcludingStatements.Expr = nil
rules := currentConfig.LookupRule(&ruleToFindExcludingStatements)
if len(rules) > 0 {
c := nft.NewConfig()
for _, rule := range rules {
c.DeleteRule(rule)
}
if err := sc.configurer.Apply(c); err != nil {
ifaceMatchRuleErr = fmt.Errorf("failed to delete iface match rule: %v", err)
}
} else {
fmt.Fprintf(os.Stderr, "spoofcheck/teardown: unable to detect iface match rule for deletion: %+v", expectedRuleToFind)
}
}
regularChainsConfig := nft.NewConfig()
regularChainsConfig.DeleteChain(ifaceChain)
regularChainsConfig.DeleteChain(sc.macChain(ifaceChain.Name))
var regularChainsErr error
if err := sc.configurer.Apply(regularChainsConfig); err != nil {
regularChainsErr = fmt.Errorf("failed to delete regular chains: %v", err)
}
if ifaceMatchRuleErr != nil || regularChainsErr != nil {
return fmt.Errorf("failed to teardown spoof-check: %v, %v", ifaceMatchRuleErr, regularChainsErr)
}
return nil
}
func (sc *SpoofChecker) matchIfaceJumpToChainRule(chain, toChain string) *schema.Rule {
return &schema.Rule{
Family: schema.FamilyBridge,
Table: natTableName,
Chain: chain,
Expr: []schema.Statement{
{Match: &schema.Match{
Op: schema.OperEQ,
Left: schema.Expression{RowData: []byte(`{"meta":{"key":"iifname"}}`)},
Right: schema.Expression{String: &sc.iface},
}},
{Verdict: schema.Verdict{Jump: &schema.ToTarget{Target: toChain}}},
},
Comment: ruleComment(sc.refID),
}
}
func (sc *SpoofChecker) jumpToChainRule(chain, toChain string) *schema.Rule {
return &schema.Rule{
Family: schema.FamilyBridge,
Table: natTableName,
Chain: chain,
Expr: []schema.Statement{
{Verdict: schema.Verdict{Jump: &schema.ToTarget{Target: toChain}}},
},
Comment: ruleComment(sc.refID),
}
}
func (sc *SpoofChecker) matchMacRule(chain string) *schema.Rule {
return &schema.Rule{
Family: schema.FamilyBridge,
Table: natTableName,
Chain: chain,
Expr: []schema.Statement{
{Match: &schema.Match{
Op: schema.OperEQ,
Left: schema.Expression{Payload: &schema.Payload{
Protocol: schema.PayloadProtocolEther,
Field: schema.PayloadFieldEtherSAddr,
}},
Right: schema.Expression{String: &sc.macAddress},
}},
{Verdict: schema.Verdict{SimpleVerdict: schema.SimpleVerdict{Return: true}}},
},
Comment: ruleComment(sc.refID),
}
}
func (sc *SpoofChecker) dropRule(chain string) *schema.Rule {
macRulesIndex := nft.NewRuleIndex()
return &schema.Rule{
Family: schema.FamilyBridge,
Table: natTableName,
Chain: chain,
Index: macRulesIndex.Next(),
Expr: []schema.Statement{
{Verdict: schema.Verdict{SimpleVerdict: schema.SimpleVerdict{Drop: true}}},
},
Comment: ruleComment(sc.refID),
}
}
func (_ *SpoofChecker) baseChain() *schema.Chain {
chainPriority := -300
return &schema.Chain{
Family: schema.FamilyBridge,
Table: natTableName,
Name: preRoutingBaseChainName,
Type: schema.TypeFilter,
Hook: schema.HookPreRouting,
Prio: &chainPriority,
Policy: schema.PolicyAccept,
}
}
func (sc *SpoofChecker) ifaceChain() *schema.Chain {
ifaceChainName := "cni-br-iface-" + sc.refID
return &schema.Chain{
Family: schema.FamilyBridge,
Table: natTableName,
Name: ifaceChainName,
}
}
func (_ *SpoofChecker) macChain(ifaceChainName string) *schema.Chain {
macChainName := ifaceChainName + "-mac"
return &schema.Chain{
Family: schema.FamilyBridge,
Table: natTableName,
Name: macChainName,
}
}
func ruleComment(id string) string {
const refIDPrefix = "macspoofchk-"
return refIDPrefix + id
}

297
pkg/link/spoofcheck_test.go Normal file
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@ -0,0 +1,297 @@
// Copyright 2021 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 link_test
import (
"fmt"
"github.com/networkplumbing/go-nft/nft"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"github.com/containernetworking/plugins/pkg/link"
)
var _ = Describe("spoofcheck", func() {
iface := "net0"
mac := "02:00:00:00:12:34"
id := "container99-net1"
Context("setup", func() {
It("succeeds", func() {
c := configurerStub{}
sc := link.NewSpoofCheckerWithConfigurer(iface, mac, id, &c)
Expect(sc.Setup()).To(Succeed())
assertExpectedTableAndChainsInSetupConfig(c)
assertExpectedRulesInSetupConfig(c)
})
It("fails to setup config when 1st apply is unsuccessful (declare table and chains)", func() {
c := &configurerStub{failFirstApplyConfig: true}
sc := link.NewSpoofCheckerWithConfigurer(iface, mac, id, c)
Expect(sc.Setup()).To(MatchError("failed to setup spoof-check: " + errorFirstApplyText))
})
It("fails to setup config when 2nd apply is unsuccessful (flush and add the rules)", func() {
c := &configurerStub{failSecondApplyConfig: true}
sc := link.NewSpoofCheckerWithConfigurer(iface, mac, id, c)
Expect(sc.Setup()).To(MatchError("failed to setup spoof-check: " + errorSecondApplyText))
})
})
Context("teardown", func() {
It("succeeds", func() {
existingConfig := nft.NewConfig()
existingConfig.FromJSON([]byte(rowConfigWithRulesOnly()))
c := configurerStub{readConfig: existingConfig}
sc := link.NewSpoofCheckerWithConfigurer("", "", id, &c)
Expect(sc.Teardown()).To(Succeed())
assertExpectedBaseChainRuleDeletionInTeardownConfig(c)
assertExpectedRegularChainsDeletionInTeardownConfig(c)
})
It("fails, 1st apply is unsuccessful (delete iface match rule)", func() {
config := nft.NewConfig()
config.FromJSON([]byte(rowConfigWithRulesOnly()))
c := &configurerStub{applyConfig: []*nft.Config{config}, readConfig: config, failFirstApplyConfig: true}
sc := link.NewSpoofCheckerWithConfigurer("", "", id, c)
Expect(sc.Teardown()).To(MatchError(fmt.Sprintf(
"failed to teardown spoof-check: failed to delete iface match rule: %s, <nil>", errorFirstApplyText,
)))
})
It("fails, read current config is unsuccessful", func() {
config := nft.NewConfig()
config.FromJSON([]byte(rowConfigWithRulesOnly()))
c := &configurerStub{applyConfig: []*nft.Config{config}, readConfig: config, failReadConfig: true}
sc := link.NewSpoofCheckerWithConfigurer("", "", id, c)
Expect(sc.Teardown()).To(MatchError(fmt.Sprintf(
"failed to teardown spoof-check: %s, <nil>", errorReadText,
)))
})
It("fails, 2nd apply is unsuccessful (delete the regular chains)", func() {
config := nft.NewConfig()
config.FromJSON([]byte(rowConfigWithRulesOnly()))
c := &configurerStub{applyConfig: []*nft.Config{config}, readConfig: config, failSecondApplyConfig: true}
sc := link.NewSpoofCheckerWithConfigurer("", "", id, c)
Expect(sc.Teardown()).To(MatchError(fmt.Sprintf(
"failed to teardown spoof-check: <nil>, failed to delete regular chains: %s", errorSecondApplyText,
)))
})
It("fails, both applies are unsuccessful", func() {
config := nft.NewConfig()
config.FromJSON([]byte(rowConfigWithRulesOnly()))
c := &configurerStub{
applyConfig: []*nft.Config{config},
readConfig: config,
failFirstApplyConfig: true,
failSecondApplyConfig: true,
}
sc := link.NewSpoofCheckerWithConfigurer("", "", id, c)
Expect(sc.Teardown()).To(MatchError(fmt.Sprintf(
"failed to teardown spoof-check: "+
"failed to delete iface match rule: %s, "+
"failed to delete regular chains: %s",
errorFirstApplyText, errorSecondApplyText,
)))
})
})
})
func assertExpectedRegularChainsDeletionInTeardownConfig(action configurerStub) {
deleteRegularChainRulesJsonConfig, err := action.applyConfig[1].ToJSON()
ExpectWithOffset(1, err).NotTo(HaveOccurred())
expectedDeleteRegularChainRulesJsonConfig := `
{"nftables": [
{"delete": {"chain": {
"family": "bridge",
"table": "nat",
"name": "cni-br-iface-container99-net1"
}}},
{"delete": {"chain": {
"family": "bridge",
"table": "nat",
"name": "cni-br-iface-container99-net1-mac"
}}}
]}`
ExpectWithOffset(1, string(deleteRegularChainRulesJsonConfig)).To(MatchJSON(expectedDeleteRegularChainRulesJsonConfig))
}
func assertExpectedBaseChainRuleDeletionInTeardownConfig(action configurerStub) {
deleteBaseChainRuleJsonConfig, err := action.applyConfig[0].ToJSON()
Expect(err).NotTo(HaveOccurred())
expectedDeleteIfaceMatchRuleJsonConfig := `
{"nftables": [
{"delete": {"rule": {
"family": "bridge",
"table": "nat",
"chain": "PREROUTING",
"expr": [
{"match": {
"op": "==",
"left": {"meta": {"key": "iifname"}},
"right": "net0"
}},
{"jump": {"target": "cni-br-iface-container99-net1"}}
],
"comment": "macspoofchk-container99-net1"
}}}
]}`
Expect(string(deleteBaseChainRuleJsonConfig)).To(MatchJSON(expectedDeleteIfaceMatchRuleJsonConfig))
}
func rowConfigWithRulesOnly() string {
return `
{"nftables":[
{"rule":{"family":"bridge","table":"nat","chain":"PREROUTING",
"expr":[
{"match":{"op":"==","left":{"meta":{"key":"iifname"}},"right":"net0"}},
{"jump":{"target":"cni-br-iface-container99-net1"}}
],
"comment":"macspoofchk-container99-net1"}},
{"rule":{"family":"bridge","table":"nat","chain":"cni-br-iface-container99-net1",
"expr":[
{"jump":{"target":"cni-br-iface-container99-net1-mac"}}
],
"comment":"macspoofchk-container99-net1"}},
{"rule":{"family":"bridge","table":"nat","chain":"cni-br-iface-container99-net1-mac",
"expr":[
{"match":{
"op":"==",
"left":{"payload":{"protocol":"ether","field":"saddr"}},
"right":"02:00:00:00:12:34"
}},
{"return":null}
],
"comment":"macspoofchk-container99-net1"}},
{"rule":{"family":"bridge","table":"nat","chain":"cni-br-iface-container99-net1-mac",
"expr":[{"drop":null}],
"index":0,
"comment":"macspoofchk-container99-net1"}}
]}`
}
func assertExpectedTableAndChainsInSetupConfig(c configurerStub) {
config := c.applyConfig[0]
jsonConfig, err := config.ToJSON()
ExpectWithOffset(1, err).NotTo(HaveOccurred())
expectedConfig := `
{"nftables": [
{"table": {"family": "bridge", "name": "nat"}},
{"chain": {
"family": "bridge",
"table": "nat",
"name": "PREROUTING",
"type": "filter",
"hook": "prerouting",
"prio": -300,
"policy": "accept"
}},
{"chain": {
"family": "bridge",
"table": "nat",
"name": "cni-br-iface-container99-net1"
}},
{"chain": {
"family": "bridge",
"table": "nat",
"name": "cni-br-iface-container99-net1-mac"
}}
]}`
ExpectWithOffset(1, string(jsonConfig)).To(MatchJSON(expectedConfig))
}
func assertExpectedRulesInSetupConfig(c configurerStub) {
config := c.applyConfig[1]
jsonConfig, err := config.ToJSON()
ExpectWithOffset(1, err).NotTo(HaveOccurred())
expectedConfig := `
{"nftables":[
{"flush":{"chain":{"family":"bridge","table":"nat","name":"cni-br-iface-container99-net1"}}},
{"flush":{"chain":{"family":"bridge","table":"nat","name":"cni-br-iface-container99-net1-mac"}}},
{"rule":{"family":"bridge","table":"nat","chain":"PREROUTING",
"expr":[
{"match":{"op":"==","left":{"meta":{"key":"iifname"}},"right":"net0"}},
{"jump":{"target":"cni-br-iface-container99-net1"}}
],
"comment":"macspoofchk-container99-net1"}},
{"rule":{"family":"bridge","table":"nat","chain":"cni-br-iface-container99-net1",
"expr":[
{"jump":{"target":"cni-br-iface-container99-net1-mac"}}
],
"comment":"macspoofchk-container99-net1"}},
{"rule":{"family":"bridge","table":"nat","chain":"cni-br-iface-container99-net1-mac",
"expr":[
{"match":{
"op":"==",
"left":{"payload":{"protocol":"ether","field":"saddr"}},
"right":"02:00:00:00:12:34"
}},
{"return":null}
],
"comment":"macspoofchk-container99-net1"}},
{"rule":{"family":"bridge","table":"nat","chain":"cni-br-iface-container99-net1-mac",
"expr":[{"drop":null}],
"index":0,
"comment":"macspoofchk-container99-net1"}}
]}`
ExpectWithOffset(1, string(jsonConfig)).To(MatchJSON(expectedConfig))
}
const (
errorFirstApplyText = "1st apply failed"
errorSecondApplyText = "2nd apply failed"
errorReadText = "read failed"
)
type configurerStub struct {
applyConfig []*nft.Config
readConfig *nft.Config
applyCounter int
failFirstApplyConfig bool
failSecondApplyConfig bool
failReadConfig bool
}
func (a *configurerStub) Apply(c *nft.Config) error {
a.applyCounter++
if a.failFirstApplyConfig && a.applyCounter == 1 {
return fmt.Errorf(errorFirstApplyText)
}
if a.failSecondApplyConfig && a.applyCounter == 2 {
return fmt.Errorf(errorSecondApplyText)
}
a.applyConfig = append(a.applyConfig, c)
return nil
}
func (a *configurerStub) Read() (*nft.Config, error) {
if a.failReadConfig {
return nil, fmt.Errorf(errorReadText)
}
return a.readConfig, nil
}

28
plugins/main/bridge/bridge.go
View File

@ -20,6 +20,7 @@ import (
"fmt"
"io/ioutil"
"net"
"os"
"runtime"
"syscall"
"time"
@ -33,6 +34,7 @@ import (
"github.com/containernetworking/cni/pkg/version"
"github.com/containernetworking/plugins/pkg/ip"
"github.com/containernetworking/plugins/pkg/ipam"
"github.com/containernetworking/plugins/pkg/link"
"github.com/containernetworking/plugins/pkg/ns"
"github.com/containernetworking/plugins/pkg/utils"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
@ -55,6 +57,7 @@ type NetConf struct {
HairpinMode bool `json:"hairpinMode"`
PromiscMode bool `json:"promiscMode"`
Vlan int `json:"vlan"`
MacSpoofChk bool `json:"macspoofchk,omitempty"`
Args struct {
Cni BridgeArgs `json:"cni,omitempty"`
@ -460,6 +463,20 @@ func cmdAdd(args *skel.CmdArgs) error {
},
}
if n.MacSpoofChk {
sc := link.NewSpoofChecker(hostInterface.Name, containerInterface.Mac, uniqueID(args.ContainerID, args.IfName))
if err := sc.Setup(); err != nil {
return err
}
defer func() {
if !success {
if err := sc.Teardown(); err != nil {
fmt.Fprintf(os.Stderr, "%v", err)
}
}
}()
}
if isLayer3 {
// run the IPAM plugin and get back the config to apply
r, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
@ -658,6 +675,13 @@ func cmdDel(args *skel.CmdArgs) error {
return err
}
if n.MacSpoofChk {
sc := link.NewSpoofChecker("", "", uniqueID(args.ContainerID, args.IfName))
if err := sc.Teardown(); err != nil {
fmt.Fprintf(os.Stderr, "%v", err)
}
}
if isLayer3 && n.IPMasq {
chain := utils.FormatChainName(n.Name, args.ContainerID)
comment := utils.FormatComment(n.Name, args.ContainerID)
@ -938,3 +962,7 @@ func cmdCheck(args *skel.CmdArgs) error {
return nil
}
func uniqueID(containerID, cniIface string) string {
return containerID + "-" + cniIface
}

110
plugins/main/bridge/bridge_test.go
View File

@ -23,6 +23,7 @@ import (
"strings"
"github.com/coreos/go-iptables/iptables"
"github.com/networkplumbing/go-nft/nft"
"github.com/vishvananda/netlink/nl"
"github.com/containernetworking/cni/pkg/skel"
@ -65,19 +66,20 @@ type Net struct {
// testCase defines the CNI network configuration and the expected
// bridge addresses for a test case.
type testCase struct {
cniVersion string // CNI Version
subnet string // Single subnet config: Subnet CIDR
gateway string // Single subnet config: Gateway
ranges []rangeInfo // Ranges list (multiple subnets config)
isGW bool
isLayer2 bool
expGWCIDRs []string // Expected gateway addresses in CIDR form
vlan int
ipMasq bool
AddErr020 string
DelErr020 string
AddErr010 string
DelErr010 string
cniVersion string // CNI Version
subnet string // Single subnet config: Subnet CIDR
gateway string // Single subnet config: Gateway
ranges []rangeInfo // Ranges list (multiple subnets config)
isGW bool
isLayer2 bool
expGWCIDRs []string // Expected gateway addresses in CIDR form
vlan int
ipMasq bool
macspoofchk bool
AddErr020 string
DelErr020 string
AddErr010 string
DelErr010 string
envArgs string // CNI_ARGS
runtimeConfig struct {
@ -164,6 +166,9 @@ const (
ipamEndStr = `
}`
macspoofchkFormat = `,
"macspoofchk": %t`
argsFormat = `,
"args": {
"cni": {
@ -193,6 +198,9 @@ func (tc testCase) netConfJSON(dataDir string) string {
if tc.runtimeConfig.mac != "" {
conf += fmt.Sprintf(runtimeConfig, tc.runtimeConfig.mac)
}
if tc.macspoofchk {
conf += fmt.Sprintf(macspoofchkFormat, tc.macspoofchk)
}
if !tc.isLayer2 {
conf += netDefault
@ -2175,6 +2183,35 @@ var _ = Describe("bridge Operations", func() {
})
}
}
It(fmt.Sprintf("[%s] configures mac spoof-check (no mac spoofing)", ver), func() {
Expect(originalNS.Do(func(ns.NetNS) error {
defer GinkgoRecover()
tc := testCase{
cniVersion: ver,
subnet: "10.1.2.0/24",
macspoofchk: true,
}
args := tc.createCmdArgs(originalNS, dataDir)
_, _, err := testutils.CmdAddWithArgs(args, func() error {
return cmdAdd(args)
})
Expect(err).NotTo(HaveOccurred())
assertMacSpoofCheckRulesExist()
Expect(testutils.CmdDelWithArgs(args, func() error {
if err := cmdDel(args); err != nil {
return err
}
assertMacSpoofCheckRulesMissing()
return nil
})).To(Succeed())
return nil
})).To(Succeed())
})
}
It("check vlan id when loading net conf", func() {
@ -2211,3 +2248,50 @@ var _ = Describe("bridge Operations", func() {
}
})
})
func assertMacSpoofCheckRulesExist() {
assertMacSpoofCheckRules(
func(actual interface{}, expectedLen int) {
ExpectWithOffset(3, actual).To(HaveLen(expectedLen))
})
}
func assertMacSpoofCheckRulesMissing() {
assertMacSpoofCheckRules(
func(actual interface{}, _ int) {
ExpectWithOffset(3, actual).To(BeEmpty())
})
}
func assertMacSpoofCheckRules(assert func(actual interface{}, expectedLen int)) {
c, err := nft.ReadConfig()
ExpectWithOffset(2, err).NotTo(HaveOccurred())
expectedTable := nft.NewTable("nat", "bridge")
filter := nft.TypeFilter
hook := nft.HookPreRouting
prio := -300
policy := nft.PolicyAccept
expectedBaseChain := nft.NewChain(expectedTable, "PREROUTING", &filter, &hook, &prio, &policy)
assert(c.LookupRule(nft.NewRule(
expectedTable,
expectedBaseChain,
nil, nil, nil,
"macspoofchk-dummy-0-eth0",
)), 1)
assert(c.LookupRule(nft.NewRule(
expectedTable,
nft.NewRegularChain(expectedTable, "cni-br-iface-dummy-0-eth0"),
nil, nil, nil,
"macspoofchk-dummy-0-eth0",
)), 1)
assert(c.LookupRule(nft.NewRule(
expectedTable,
nft.NewRegularChain(expectedTable, "cni-br-iface-dummy-0-eth0-mac"),
nil, nil, nil,
"macspoofchk-dummy-0-eth0",
)), 2)
}

201
vendor/github.com/networkplumbing/go-nft/LICENSE generated vendored Normal file
View File

@ -0,0 +1,201 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
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control with that entity. For the purposes of this definition,
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direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
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"Contribution" shall mean any work of authorship, including
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2. Grant of Copyright License. Subject to the terms and conditions of
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82
vendor/github.com/networkplumbing/go-nft/nft/chain.go generated vendored Normal file
View File

@ -0,0 +1,82 @@
/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package nft
import (
"github.com/networkplumbing/go-nft/nft/schema"
)
type ChainType string
type ChainHook string
type ChainPolicy string
// Chain Types
const (
TypeFilter ChainType = schema.TypeFilter
TypeNAT ChainType = schema.TypeNAT
TypeRoute ChainType = schema.TypeRoute
)
// Chain Hooks
const (
HookPreRouting ChainHook = schema.HookPreRouting
HookInput ChainHook = schema.HookInput
HookOutput ChainHook = schema.HookOutput
HookForward ChainHook = schema.HookForward
HookPostRouting ChainHook = schema.HookPostRouting
HookIngress ChainHook = schema.HookIngress
)
// Chain Policies
const (
PolicyAccept ChainPolicy = schema.PolicyAccept
PolicyDrop ChainPolicy = schema.PolicyDrop
)
// NewRegularChain returns a new schema chain structure for a regular chain.
func NewRegularChain(table *schema.Table, name string) *schema.Chain {
return NewChain(table, name, nil, nil, nil, nil)
}
// NewChain returns a new schema chain structure for a base chain.
// For base chains, all arguments are required except the policy.
// Missing arguments will cause an error once the config is applied.
func NewChain(table *schema.Table, name string, ctype *ChainType, hook *ChainHook, prio *int, policy *ChainPolicy) *schema.Chain {
c := &schema.Chain{
Family: table.Family,
Table: table.Name,
Name: name,
}
if ctype != nil {
c.Type = string(*ctype)
}
if hook != nil {
c.Hook = string(*hook)
}
if prio != nil {
c.Prio = prio
}
if policy != nil {
c.Policy = string(*policy)
}
return c
}

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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package nft
import (
nftconfig "github.com/networkplumbing/go-nft/nft/config"
nftexec "github.com/networkplumbing/go-nft/nft/exec"
)
type Config = nftconfig.Config
// NewConfig returns a new nftables config structure.
func NewConfig() *nftconfig.Config {
return nftconfig.New()
}
// ReadConfig loads the nftables configuration from the system and
// returns it as a nftables config structure.
// The system is expected to have the `nft` executable deployed and nftables enabled in the kernel.
func ReadConfig() (*Config, error) {
return nftexec.ReadConfig()
}
// ApplyConfig applies the given nftables config on the system.
// The system is expected to have the `nft` executable deployed and nftables enabled in the kernel.
func ApplyConfig(c *Config) error {
return nftexec.ApplyConfig(c)
}

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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package config
import (
"github.com/networkplumbing/go-nft/nft/schema"
)
// AddChain appends the given chain to the nftable config.
// The chain is added without an explicit action (`add`).
// Adding multiple times the same chain has no affect when the config is applied.
func (c *Config) AddChain(chain *schema.Chain) {
nftable := schema.Nftable{Chain: chain}
c.Nftables = append(c.Nftables, nftable)
}
// DeleteChain appends a given chain to the nftable config
// with the `delete` action.
// Attempting to delete a non-existing chain, results with a failure when the config is applied.
// The chain must not contain any rules or be used as a jump target.
func (c *Config) DeleteChain(chain *schema.Chain) {
nftable := schema.Nftable{Delete: &schema.Objects{Chain: chain}}
c.Nftables = append(c.Nftables, nftable)
}
// FlushChain appends a given chain to the nftable config
// with the `flush` action.
// All rules under the chain are removed (when applied).
// Attempting to flush a non-existing chain, results with a failure when the config is applied.
func (c *Config) FlushChain(chain *schema.Chain) {
nftable := schema.Nftable{Flush: &schema.Objects{Chain: chain}}
c.Nftables = append(c.Nftables, nftable)
}
// LookupChain searches the configuration for a matching chain and returns it.
// The chain is matched first by the table and chain name.
// Other matching fields are optional (for matching base chains).
// Mutating the returned chain will result in mutating the configuration.
func (c *Config) LookupChain(toFind *schema.Chain) *schema.Chain {
for _, nftable := range c.Nftables {
if chain := nftable.Chain; chain != nil {
match := chain.Table == toFind.Table && chain.Family == toFind.Family && chain.Name == toFind.Name
if match {
if t := toFind.Type; t != "" {
match = match && chain.Type == t
}
if h := toFind.Hook; h != "" {
match = match && chain.Hook == h
}
if p := toFind.Prio; p != nil {
match = match && chain.Prio != nil && *chain.Prio == *p
}
if p := toFind.Policy; p != "" {
match = match && chain.Policy == p
}
if match {
return chain
}
}
}
}
return nil
}

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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package config
import (
"encoding/json"
"github.com/networkplumbing/go-nft/nft/schema"
)
type Config struct {
schema.Root
}
// New returns a new nftables config structure.
func New() *Config {
c := &Config{}
c.Nftables = []schema.Nftable{}
return c
}
// ToJSON returns the JSON encoding of the nftables config.
func (c *Config) ToJSON() ([]byte, error) {
return json.Marshal(*c)
}
// FromJSON decodes the provided JSON-encoded data and populates the nftables config.
func (c *Config) FromJSON(data []byte) error {
if err := json.Unmarshal(data, c); err != nil {
return err
}
return nil
}
// FlushRuleset adds a command to the nftables config that erases all the configuration when applied.
// It is commonly used as the first config instruction, followed by a declarative configuration.
// When used, any previous configuration is flushed away before adding the new one.
// Calling FlushRuleset updates the configuration and will take effect only
// when applied on the system.
func (c *Config) FlushRuleset() {
c.Nftables = append(c.Nftables, schema.Nftable{Flush: &schema.Objects{Ruleset: true}})
}

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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package config
import (
"bytes"
"encoding/json"
"github.com/networkplumbing/go-nft/nft/schema"
)
// AddRule appends the given rule to the nftable config.
// The rule is added without an explicit action (`add`).
// Adding multiple times the same rule will result in multiple identical rules when applied.
func (c *Config) AddRule(rule *schema.Rule) {
nftable := schema.Nftable{Rule: rule}
c.Nftables = append(c.Nftables, nftable)
}
// DeleteRule appends a given rule to the nftable config
// with the `delete` action.
// A rule is identified by its handle ID and it must be present in the given rule.
// Attempting to delete a non-existing rule, results with a failure when the config is applied.
// A common usage is to use LookupRule() and then to pass the result to DeleteRule.
func (c *Config) DeleteRule(rule *schema.Rule) {
nftable := schema.Nftable{Delete: &schema.Objects{Rule: rule}}
c.Nftables = append(c.Nftables, nftable)
}
// LookupRule searches the configuration for a matching rule and returns it.
// The rule is matched first by the table and chain.
// Other matching fields are optional (nil or an empty string arguments imply no-matching).
// Mutating the returned chain will result in mutating the configuration.
func (c *Config) LookupRule(toFind *schema.Rule) []*schema.Rule {
var rules []*schema.Rule
for _, nftable := range c.Nftables {
if r := nftable.Rule; r != nil {
match := r.Table == toFind.Table && r.Family == toFind.Family && r.Chain == toFind.Chain
if match {
if h := toFind.Handle; h != nil {
match = match && r.Handle != nil && *r.Handle == *h
}
if i := toFind.Index; i != nil {
match = match && r.Index != nil && *r.Index == *i
}
if co := toFind.Comment; co != "" {
match = match && r.Comment == co
}
if toFindStatements := toFind.Expr; toFindStatements != nil {
if match = match && len(toFindStatements) == len(r.Expr); match {
for i, toFindStatement := range toFindStatements {
equal, err := areStatementsEqual(toFindStatement, r.Expr[i])
match = match && err == nil && equal
}
}
}
if match {
rules = append(rules, r)
}
}
}
}
return rules
}
func areStatementsEqual(statementA, statementB schema.Statement) (bool, error) {
statementARow, err := json.Marshal(statementA)
if err != nil {
return false, err
}
statementBRow, err := json.Marshal(statementB)
if err != nil {
return false, err
}
return bytes.Equal(statementARow, statementBRow), nil
}

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vendor/github.com/networkplumbing/go-nft/nft/config/table.go generated vendored Normal file
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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package config
import (
"github.com/networkplumbing/go-nft/nft/schema"
)
// AddTable appends the given table to the nftable config.
// The table is added without an explicit action (`add`).
// Adding multiple times the same table has no effect when the config is applied.
func (c *Config) AddTable(table *schema.Table) {
nftable := schema.Nftable{Table: table}
c.Nftables = append(c.Nftables, nftable)
}
// DeleteTable appends a given table to the nftable config
// with the `delete` action.
// Attempting to delete a non-existing table, results with a failure when the config is applied.
// All chains and rules under the table are removed as well (when applied).
func (c *Config) DeleteTable(table *schema.Table) {
nftable := schema.Nftable{Delete: &schema.Objects{Table: table}}
c.Nftables = append(c.Nftables, nftable)
}
// FlushTable appends a given table to the nftable config
// with the `flush` action.
// All chains and rules under the table are removed (when applied).
// Attempting to flush a non-existing table, results with a failure when the config is applied.
func (c *Config) FlushTable(table *schema.Table) {
nftable := schema.Nftable{Flush: &schema.Objects{Table: table}}
c.Nftables = append(c.Nftables, nftable)
}
// LookupTable searches the configuration for a matching table and returns it.
// Mutating the returned table will result in mutating the configuration.
func (c *Config) LookupTable(toFind *schema.Table) *schema.Table {
for _, nftable := range c.Nftables {
if t := nftable.Table; t != nil {
if t.Name == toFind.Name && t.Family == toFind.Family {
return t
}
}
}
return nil
}

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vendor/github.com/networkplumbing/go-nft/nft/doc.go generated vendored Normal file
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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
// Package nft provides a GO API to nftables.
// Together with the schema package, it allows to build, read and apply
// nftables configuration on a supporting system.
//
// The schema structures are based on libnftables-json (https://www.mankier.com/5/libnftables-json)
// and implement a subset of them.
//
// To create a new configuration, use `NewConfig` followed by methods
// which populates the configuration with tables, chains and rules, accompanied
// to specific actions (add, delete, flush).
//
// config := nft.NewConfig()
// table := nft.NewTable("mytable", nft.FamilyIP)
// config.AddTable(table)
// chain := nft.NewRegularChain(table, "mychain")
// config.AddChain(chain)
// rule := nft.NewRule(table, chain, statements, nil, nil, "mycomment")
//
// To apply a configuration on the system, use the `ApplyConfig` function.
// err := nft.ApplyConfig(config)
//
// To read the configuration from the system, use the `ReadConfig` function.
// config, err := nft.ReadConfig()
//
// For full setup example, see the integration test: tests/config_test.go
//
// The nft package is dependent on the `nft` binary and the kernel nftables
// support.
package nft

102
vendor/github.com/networkplumbing/go-nft/nft/exec/exec.go generated vendored Normal file
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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package exec
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strings"
nftconfig "github.com/networkplumbing/go-nft/nft/config"
)
const (
cmdBin = "nft"
cmdFile = "-f"
cmdJSON = "-j"
cmdList = "list"
cmdRuleset = "ruleset"
)
// ReadConfig loads the nftables configuration from the system and
// returns it as a nftables config structure.
// The system is expected to have the `nft` executable deployed and nftables enabled in the kernel.
func ReadConfig() (*nftconfig.Config, error) {
stdout, err := execCommand(cmdJSON, cmdList, cmdRuleset)
if err != nil {
return nil, err
}
config := nftconfig.New()
if err := config.FromJSON(stdout.Bytes()); err != nil {
return nil, fmt.Errorf("failed to list ruleset: %v", err)
}
return config, nil
}
// ApplyConfig applies the given nftables config on the system.
// The system is expected to have the `nft` executable deployed and nftables enabled in the kernel.
func ApplyConfig(c *nftconfig.Config) error {
data, err := c.ToJSON()
if err != nil {
return err
}
tmpFile, err := ioutil.TempFile(os.TempDir(), "spoofcheck-")
if err != nil {
return fmt.Errorf("failed to create temporary file: %v", err)
}
defer os.Remove(tmpFile.Name())
if _, err = tmpFile.Write(data); err != nil {
return fmt.Errorf("failed to write to temporary file: %v", err)
}
if err := tmpFile.Close(); err != nil {
return fmt.Errorf("failed to close temporary file: %v", err)
}
if _, err := execCommand(cmdJSON, cmdFile, tmpFile.Name()); err != nil {
return err
}
return nil
}
func execCommand(args ...string) (*bytes.Buffer, error) {
cmd := exec.Command(cmdBin, args...)
var stdout, stderr bytes.Buffer
cmd.Stderr = &stderr
cmd.Stdout = &stdout
if err := cmd.Run(); err != nil {
return nil, fmt.Errorf(
"failed to execute %s %s: %v stdout:'%s' stderr:'%s'",
cmd.Path, strings.Join(cmd.Args, " "), err, stdout.String(), stderr.String(),
)
}
return &stdout, nil
}

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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package nft
import (
"github.com/networkplumbing/go-nft/nft/schema"
)
// NewRule returns a new schema rule structure.
func NewRule(table *schema.Table, chain *schema.Chain, expr []schema.Statement, handle *int, index *int, comment string) *schema.Rule {
c := &schema.Rule{
Family: table.Family,
Table: table.Name,
Chain: chain.Name,
Expr: expr,
Handle: handle,
Index: index,
Comment: comment,
}
return c
}
type RuleIndex int
// NewRuleIndex returns a rule index object which acts as an iterator.
// When multiple rules are added to a chain, index allows to define an order between them.
// The first rule which is added to a chain should have no index (it is assigned index 0),
// following rules should have the index set, referencing after/before which rule the new one is to be added/inserted.
func NewRuleIndex() *RuleIndex {
var index RuleIndex = -1
return &index
}
// Next returns the next iteration value as an integer pointer.
// When first time called, it returns the value 0.
func (i *RuleIndex) Next() *int {
*i++
var index = int(*i)
return &index
}

53
vendor/github.com/networkplumbing/go-nft/nft/schema/chain.go generated vendored Normal file
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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package schema
// Chain Types
const (
TypeFilter = "filter"
TypeNAT = "nat"
TypeRoute = "route"
)
// Chain Hooks
const (
HookPreRouting = "prerouting"
HookInput = "input"
HookOutput = "output"
HookForward = "forward"
HookPostRouting = "postrouting"
HookIngress = "ingress"
)
// Chain Policies
const (
PolicyAccept = "accept"
PolicyDrop = "drop"
)
type Chain struct {
Family string `json:"family"`
Table string `json:"table"`
Name string `json:"name"`
Type string `json:"type,omitempty"`
Hook string `json:"hook,omitempty"`
Prio *int `json:"prio,omitempty"`
Policy string `json:"policy,omitempty"`
}

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/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package schema
import (
"encoding/json"
"fmt"
)
type Rule struct {
Family string `json:"family"`
Table string `json:"table"`
Chain string `json:"chain"`
Expr []Statement `json:"expr,omitempty"`
Handle *int `json:"handle,omitempty"`
Index *int `json:"index,omitempty"`
Comment string `json:"comment,omitempty"`
}
type Statement struct {
Counter *Counter `json:"counter,omitempty"`
Match *Match `json:"match,omitempty"`
Verdict
Nat
}
type Counter struct {
Packets int `json:"packets"`
Bytes int `json:"bytes"`
}
type Nat struct {
Snat *Snat `json:"snat,omitempty"`
Dnat *Dnat `json:"dnat,omitempty"`
Masquerade *Masquerade `json:"masquerade,omitempty"`
Redirect *Redirect `json:"redirect,omitempty"`
}
type Snat struct {
Addr *Expression `json:"addr,omitempty"`
Family *string `json:"family,omitempty"`
Port *Expression `json:"port,omitempty"`
Flags *Flags `json:"flags,omitempty"`
}
type Dnat struct {
Addr *Expression `json:"addr,omitempty"`
Family *string `json:"family,omitempty"`
Port *Expression `json:"port,omitempty"`
Flags *Flags `json:"flags,omitempty"`
}
const masquerade = "masquerade"
type Masquerade struct {
Enabled bool `json:"-"`
Port *Expression `json:"port,omitempty"`
Flags *Flags `json:"flags,omitempty"`
}
const redirect = "redirect"
type Redirect struct {
Enabled bool `json:"-"`
Port *Expression `json:"port,omitempty"`
Flags *Flags `json:"flags,omitempty"`
}
type Flags struct {
Flags []string `json:"-"`
}
// NAT Flags
const (
NATFlagRandom = "random"
NATFlagFullyRandom = "fully-random"
NATFlagPersistent = "persistent"
)
type Verdict struct {
SimpleVerdict
Jump *ToTarget `json:"jump,omitempty"`
Goto *ToTarget `json:"goto,omitempty"`
}
type SimpleVerdict struct {
Accept bool `json:"-"`
Continue bool `json:"-"`
Drop bool `json:"-"`
Return bool `json:"-"`
}
type ToTarget struct {
Target string `json:"target"`
}
type Match struct {
Op string `json:"op"`
Left Expression `json:"left"`
Right Expression `json:"right"`
}
type Expression struct {
String *string `json:"-"`
Bool *bool `json:"-"`
Float64 *float64 `json:"-"`
Payload *Payload `json:"payload,omitempty"`
// RowData accepts arbitrary data which cannot be composed from the existing schema.
// Use `json.RawMessage()` or `[]byte()` for the value.
// Example:
// `schema.Expression{RowData: json.RawMessage(`{"meta":{"key":"iifname"}}`)}`
RowData json.RawMessage `json:"-"`
}
type Payload struct {
Protocol string `json:"protocol"`
Field string `json:"field"`
}
// Verdict Operations
const (
VerdictAccept = "accept"
VerdictContinue = "continue"
VerdictDrop = "drop"
VerdictReturn = "return"
)
// Match Operators
const (
OperAND = "&" // Binary AND
OperOR = "|" // Binary OR
OperXOR = "^" // Binary XOR
OperLSH = "<<" // Left shift
OperRSH = ">>" // Right shift
OperEQ = "==" // Equal
OperNEQ = "!=" // Not equal
OperLS = "<" // Less than
OperGR = ">" // Greater than
OperLSE = "<=" // Less than or equal to
OperGRE = ">=" // Greater than or equal to
OperIN = "in" // Perform a lookup, i.e. test if bits on RHS are contained in LHS value
)
// Payload Expressions
const (
PayloadKey = "payload"
// Ethernet
PayloadProtocolEther = "ether"
PayloadFieldEtherDAddr = "daddr"
PayloadFieldEtherSAddr = "saddr"
PayloadFieldEtherType = "type"
// IP (common)
PayloadFieldIPVer = "version"
PayloadFieldIPDscp = "dscp"
PayloadFieldIPEcn = "ecn"
PayloadFieldIPLen = "length"
PayloadFieldIPSAddr = "saddr"
PayloadFieldIPDAddr = "daddr"
// IPv4
PayloadProtocolIP4 = "ip"
PayloadFieldIP4HdrLen = "hdrlength"
PayloadFieldIP4Id = "id"
PayloadFieldIP4FragOff = "frag-off"
PayloadFieldIP4Ttl = "ttl"
PayloadFieldIP4Protocol = "protocol"
PayloadFieldIP4Chksum = "checksum"
// IPv6
PayloadProtocolIP6 = "ip6"
PayloadFieldIP6FlowLabel = "flowlabel"
PayloadFieldIP6NextHdr = "nexthdr"
PayloadFieldIP6HopLimit = "hoplimit"
)
func (s Statement) MarshalJSON() ([]byte, error) {
type _Statement Statement
statement := _Statement(s)
// Convert to a dynamic structure
data, err := json.Marshal(statement)
if err != nil {
return nil, err
}
dynamicStructure := make(map[string]json.RawMessage)
if err := json.Unmarshal(data, &dynamicStructure); err != nil {
return nil, err
}
switch {
case s.Accept:
dynamicStructure[VerdictAccept] = nil
case s.Continue:
dynamicStructure[VerdictContinue] = nil
case s.Drop:
dynamicStructure[VerdictDrop] = nil
case s.Return:
dynamicStructure[VerdictReturn] = nil
case s.Masquerade != nil && s.Masquerade.Enabled && s.Masquerade.Port == nil && s.Masquerade.Flags == nil:
dynamicStructure[masquerade] = nil
case s.Redirect != nil && s.Redirect.Enabled && s.Redirect.Port == nil && s.Redirect.Flags == nil:
dynamicStructure[redirect] = nil
}
data, err = json.Marshal(dynamicStructure)
if err != nil {
return nil, err
}
return data, nil
}
func (s *Statement) UnmarshalJSON(data []byte) error {
type _Statement Statement
statement := _Statement{}
if err := json.Unmarshal(data, &statement); err != nil {
return err
}
*s = Statement(statement)
dynamicStructure := make(map[string]json.RawMessage)
if err := json.Unmarshal(data, &dynamicStructure); err != nil {
return err
}
_, s.Accept = dynamicStructure[VerdictAccept]
_, s.Continue = dynamicStructure[VerdictContinue]
_, s.Drop = dynamicStructure[VerdictDrop]
_, s.Return = dynamicStructure[VerdictReturn]
if _, masqueradeDefined := dynamicStructure[masquerade]; s.Masquerade == nil && masqueradeDefined {
s.Masquerade = &Masquerade{Enabled: true}
}
if _, redirectDefined := dynamicStructure[redirect]; s.Redirect == nil && redirectDefined {
s.Redirect = &Redirect{Enabled: true}
}
return nil
}
func (e Expression) MarshalJSON() ([]byte, error) {
var dynamicStruct interface{}
switch {
case e.RowData != nil:
return e.RowData, nil
case e.String != nil:
dynamicStruct = *e.String
case e.Float64 != nil:
dynamicStruct = *e.Float64
case e.Bool != nil:
dynamicStruct = *e.Bool
default:
type _Expression Expression
dynamicStruct = _Expression(e)
}
return json.Marshal(dynamicStruct)
}
func (e *Expression) UnmarshalJSON(data []byte) error {
var dynamicStruct interface{}
if err := json.Unmarshal(data, &dynamicStruct); err != nil {
return err
}
switch dynamicStruct.(type) {
case string:
d := dynamicStruct.(string)
e.String = &d
case float64:
d := dynamicStruct.(float64)
e.Float64 = &d
case bool:
d := dynamicStruct.(bool)
e.Bool = &d
case []interface{}:
e.RowData = data
case map[string]interface{}:
type _Expression Expression
expression := _Expression(*e)
if err := json.Unmarshal(data, &expression); err != nil {
return err
}
*e = Expression(expression)
default:
return fmt.Errorf("unsupported field type in expression: %T(%v)", dynamicStruct, dynamicStruct)
}
if e.String == nil && e.Float64 == nil && e.Bool == nil && e.Payload == nil {
e.RowData = data
}
return nil
}
func (f Flags) MarshalJSON() ([]byte, error) {
var dynamicStruct interface{}
switch flagCount := len(f.Flags); {
case flagCount == 1:
dynamicStruct = f.Flags[0]
case flagCount > 1:
dynamicStruct = f.Flags
}
return json.Marshal(dynamicStruct)
}
func (f *Flags) UnmarshalJSON(data []byte) error {
var dynamicStruct interface{}
if err := json.Unmarshal(data, &dynamicStruct); err != nil {
return err
}
switch v := dynamicStruct.(type) {
case string:
f.Flags = []string{v}
case []interface{}:
for _, val := range v {
stringVal, ok := val.(string)
if !ok {
return fmt.Errorf("flags values require string type: %T(%v)", dynamicStruct, dynamicStruct)
}
f.Flags = append(f.Flags, stringVal)
}
default:
return fmt.Errorf("flags values require string type: %T(%v)", dynamicStruct, dynamicStruct)
}
return nil
}
func Accept() Verdict {
return Verdict{SimpleVerdict: SimpleVerdict{Accept: true}}
}
func Continue() Verdict {
return Verdict{SimpleVerdict: SimpleVerdict{Continue: true}}
}
func Drop() Verdict {
return Verdict{SimpleVerdict: SimpleVerdict{Drop: true}}
}
func Return() Verdict {
return Verdict{SimpleVerdict: SimpleVerdict{Return: true}}
}

80
vendor/github.com/networkplumbing/go-nft/nft/schema/schema.go generated vendored Normal file
View File

@ -0,0 +1,80 @@
/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package schema
import (
"encoding/json"
)
type Root struct {
Nftables []Nftable `json:"nftables"`
}
const ruleSetKey = "ruleset"
type Objects struct {
Table *Table `json:"table,omitempty"`
Chain *Chain `json:"chain,omitempty"`
Rule *Rule `json:"rule,omitempty"`
Ruleset bool `json:"-"`
}
func (o Objects) MarshalJSON() ([]byte, error) {
type _Objects Objects
objects := _Objects(o)
data, err := json.Marshal(objects)
if err != nil {
return nil, err
}
if o.Ruleset {
// Convert to a dynamic structure
var dynamicStructure map[string]json.RawMessage
if err := json.Unmarshal(data, &dynamicStructure); err != nil {
return nil, err
}
dynamicStructure[ruleSetKey] = nil
data, err = json.Marshal(dynamicStructure)
if err != nil {
return nil, err
}
}
return data, nil
}
type Nftable struct {
Table *Table `json:"table,omitempty"`
Chain *Chain `json:"chain,omitempty"`
Rule *Rule `json:"rule,omitempty"`
Add *Objects `json:"add,omitempty"`
Delete *Objects `json:"delete,omitempty"`
Flush *Objects `json:"flush,omitempty"`
Metainfo *Metainfo `json:"metainfo,omitempty"`
}
type Metainfo struct {
Version string `json:"version"`
ReleaseName string `json:"release_name"`
JsonSchemaVersion int `json:"json_schema_version"`
}

35
vendor/github.com/networkplumbing/go-nft/nft/schema/table.go generated vendored Normal file
View File

@ -0,0 +1,35 @@
/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package schema
// Table Address Families
const (
FamilyIP = "ip" // IPv4 address AddressFamily.
FamilyIP6 = "ip6" // IPv6 address AddressFamily.
FamilyINET = "inet" // Internet (IPv4/IPv6) address AddressFamily.
FamilyARP = "arp" // ARP address AddressFamily, handling IPv4 ARP packets.
FamilyBridge = "bridge" // Bridge address AddressFamily, handling packets which traverse a bridge device.
FamilyNETDEV = "netdev" // Netdev address AddressFamily, handling packets from ingress.
)
type Table struct {
Family string `json:"family"`
Name string `json:"name"`
}

51
vendor/github.com/networkplumbing/go-nft/nft/table.go generated vendored Normal file
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@ -0,0 +1,51 @@
/*
* This file is part of the go-nft project
*
* 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.
*
* Copyright 2021 Red Hat, Inc.
*
*/
package nft
import "github.com/networkplumbing/go-nft/nft/schema"
type AddressFamily string
// Address Families
const (
FamilyIP AddressFamily = schema.FamilyIP
FamilyIP6 AddressFamily = schema.FamilyIP6
FamilyINET AddressFamily = schema.FamilyINET
FamilyARP AddressFamily = schema.FamilyARP
FamilyBridge AddressFamily = schema.FamilyBridge
FamilyNETDEV AddressFamily = schema.FamilyNETDEV
)
type TableAction string
// Table Actions
const (
TableADD TableAction = "add"
TableDELETE TableAction = "delete"
TableFLUSH TableAction = "flush"
)
// NewTable returns a new schema table structure.
func NewTable(name string, family AddressFamily) *schema.Table {
return &schema.Table{
Name: name,
Family: string(family),
}
}

6
vendor/modules.txt vendored
View File

@ -84,6 +84,12 @@ github.com/j-keck/arping
# github.com/mattn/go-shellwords v1.0.12
## explicit
github.com/mattn/go-shellwords
# github.com/networkplumbing/go-nft v0.2.0
## explicit
github.com/networkplumbing/go-nft/nft
github.com/networkplumbing/go-nft/nft/config
github.com/networkplumbing/go-nft/nft/exec
github.com/networkplumbing/go-nft/nft/schema
# github.com/nxadm/tail v1.4.8
github.com/nxadm/tail
github.com/nxadm/tail/ratelimiter