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Resolves: containernetworking#461
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,203 @@ | ||
| // Copyright 2018 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" | ||
| "github.com/containernetworking/cni/pkg/types/current" | ||
| "github.com/davecgh/go-spew/spew" | ||
| "github.com/google/nftables" | ||
| "github.com/sirupsen/logrus" | ||
| "net" | ||
| ) | ||
|
|
||
| // Only used for testcases to override the D-Bus connection | ||
| var testNftConn *nftables.Conn | ||
|
|
||
| type nftBackend struct { | ||
| conn *nftables.Conn | ||
| tables []*nftables.Table | ||
| chains []*nftables.Chain | ||
| targetTable *nftables.Table | ||
| targetChain *nftables.Chain | ||
| targetHandle uint64 | ||
| targetInterface string | ||
| targetNetwork *net.IPNet | ||
| } | ||
|
|
||
| // nftBackend implements the FirewallBackend interface | ||
| var _ FirewallBackend = &nftBackend{} | ||
|
|
||
| func getNftConn() (*nftables.Conn, error) { | ||
| if testNftConn != nil { | ||
| return testNftConn, nil | ||
| } | ||
| return &nftables.Conn{}, nil | ||
| } | ||
|
|
||
| func newNftablesBackend(conf *FirewallNetConf) (FirewallBackend, error) { | ||
| conn, err := getNftConn() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| backend := &nftBackend{ | ||
| conn: conn, | ||
| } | ||
| return backend, nil | ||
| } | ||
|
|
||
| func (nb *nftBackend) isFilterTableExists() error { | ||
| isTableFound := false | ||
| tables, err := nb.conn.ListTables() | ||
| if err != nil { | ||
| return fmt.Errorf("isFilterTableExists(): %s", err) | ||
| } | ||
| for _, table := range tables { | ||
| if table.Name == "filter" && table.Family == 2 { | ||
| nb.targetTable = table | ||
| isTableFound = true | ||
| break | ||
| } | ||
| } | ||
| if !isTableFound { | ||
| return fmt.Errorf("isFilterTableExists(): the IPv4 filter table does not exist") | ||
| } | ||
| nb.tables = tables | ||
| return nil | ||
| } | ||
|
|
||
| func (nb *nftBackend) isForwardChainExists() error { | ||
| isChainFound := false | ||
| chains, err := nb.conn.ListChains() | ||
| if err != nil { | ||
| return fmt.Errorf("isForwardChainExists(): %s", err) | ||
| } | ||
| for _, chain := range chains { | ||
| if chain.Name != "FORWARD" { | ||
| continue | ||
| } | ||
| if chain.Type != "filter" { | ||
| continue | ||
| } | ||
| if chain.Table.Name != "filter" { | ||
| continue | ||
| } | ||
| if chain.Table.Family != 2 { | ||
| continue | ||
| } | ||
| nb.targetChain = chain | ||
| isChainFound = true | ||
| break | ||
| } | ||
| if !isChainFound { | ||
| return fmt.Errorf("isForwardChainExists(): the FORWARD chain in IPv4 filter table does not exist") | ||
| } | ||
| nb.chains = chains | ||
| return nil | ||
| } | ||
|
|
||
| func (nb *nftBackend) isValidInput(result *current.Result) error { | ||
| if len(result.Interfaces) == 0 { | ||
| return fmt.Errorf("the data passed to firewall plugin did not contain network interfaces") | ||
| } | ||
|
|
||
| if result.Interfaces[0].Name == "" { | ||
| return fmt.Errorf("the data passed to firewall plugin has no bridge name, e.g. cnibr0") | ||
| } | ||
|
|
||
| nb.targetInterface = result.Interfaces[0].Name | ||
|
|
||
| logrus.Errorf("nftBackend.Add() target interface: %s", spew.Sdump(nb.targetInterface)) | ||
|
|
||
| if len(result.IPs) == 0 { | ||
| return fmt.Errorf("the data passed to firewall plugin has no IP addresses") | ||
| } | ||
|
|
||
| if len(result.IPs) != 1 { | ||
| return fmt.Errorf("the data passed to firewall plugin has more than one IP address") | ||
| } | ||
|
|
||
| addr := result.IPs[0].Address | ||
|
|
||
| if addr.String() == "" { | ||
| return fmt.Errorf("the data passed to firewall plugin has empty IP address") | ||
| } | ||
|
|
||
| if addr.IP.To4() == nil { | ||
| return fmt.Errorf("the data passed to firewall plugin has non-IPv4 address") | ||
| } | ||
|
|
||
| _, netAddr, err := net.ParseCIDR(addr.String()) | ||
| if err != nil { | ||
| return fmt.Errorf("the data passed to firewall plugin has invalid IPv4 address") | ||
| } | ||
|
|
||
| nb.targetNetwork = netAddr | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (nb *nftBackend) Add(conf *FirewallNetConf, result *current.Result) error { | ||
| if err := nb.isValidInput(result); err != nil { | ||
| return fmt.Errorf("nftBackend.Add() %s", err) | ||
| } | ||
|
|
||
| if err := nb.isFilterTableExists(); err != nil { | ||
| return fmt.Errorf("nftBackend.Add() %s", err) | ||
| } | ||
|
|
||
| if err := nb.isForwardChainExists(); err != nil { | ||
| return fmt.Errorf("nftBackend.Add() %s", err) | ||
| } | ||
|
|
||
| rules, err := nb.conn.GetRule(nb.targetTable, nb.targetChain) | ||
| if err != nil { | ||
| return fmt.Errorf("nftBackend.Add() GetRule failed: %s", err) | ||
| } | ||
|
|
||
| return fmt.Errorf("nftBackend.Add is not supported") | ||
|
|
||
| if len(rules) > 0 { | ||
| nb.targetHandle = rules[0].Handle | ||
| for _, rule := range rules { | ||
| logrus.Errorf("nftBackend.Add() rule: %s", spew.Sdump(rule.Handle)) | ||
| //logrus.Errorf("nftBackend.Add() rule: %s", spew.Sdump(rule)) | ||
| } | ||
| } | ||
|
|
||
| if nb.targetHandle == 0 { | ||
| // TODO: add rules as opposed to insert | ||
| } else { | ||
| // TODO: insert the rules | ||
| } | ||
|
|
||
| return fmt.Errorf("nftBackend.Add is not supported") | ||
| //return nil | ||
| } | ||
|
|
||
| func (nb *nftBackend) Del(conf *FirewallNetConf, result *current.Result) error { | ||
| logrus.Errorf("nftBackend.Del() conf: %s", spew.Sdump(conf)) | ||
| logrus.Errorf("nftBackend.Del() result: %s", spew.Sdump(result)) | ||
| // TODO | ||
| return nil | ||
| } | ||
|
|
||
| func (nb *nftBackend) Check(conf *FirewallNetConf, result *current.Result) error { | ||
| // TODO | ||
| logrus.Errorf("nftBackend.Check() conf: %s", spew.Sdump(conf)) | ||
| logrus.Errorf("nftBackend.Check() result: %s", spew.Sdump(result)) | ||
| return nil | ||
| } |
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