Update dependencies
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bluepython508
212
vendor/github.com/google/nftables/table.go
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vendored
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212
vendor/github.com/google/nftables/table.go
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// Copyright 2018 Google LLC. All Rights Reserved.
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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 nftables
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import (
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"fmt"
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"github.com/mdlayher/netlink"
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"golang.org/x/sys/unix"
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)
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var (
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newTableHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWTABLE)
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delTableHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELTABLE)
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)
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// TableFamily specifies the address family for this table.
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type TableFamily byte
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// Possible TableFamily values.
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const (
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TableFamilyUnspecified TableFamily = unix.NFPROTO_UNSPEC
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TableFamilyINet TableFamily = unix.NFPROTO_INET
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TableFamilyIPv4 TableFamily = unix.NFPROTO_IPV4
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TableFamilyIPv6 TableFamily = unix.NFPROTO_IPV6
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TableFamilyARP TableFamily = unix.NFPROTO_ARP
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TableFamilyNetdev TableFamily = unix.NFPROTO_NETDEV
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TableFamilyBridge TableFamily = unix.NFPROTO_BRIDGE
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)
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// A Table contains Chains. See also
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// https://wiki.nftables.org/wiki-nftables/index.php/Configuring_tables
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type Table struct {
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Name string // NFTA_TABLE_NAME
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Use uint32 // NFTA_TABLE_USE (Number of chains in table)
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Flags uint32 // NFTA_TABLE_FLAGS
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Family TableFamily
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}
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// DelTable deletes a specific table, along with all chains/rules it contains.
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func (cc *Conn) DelTable(t *Table) {
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cc.mu.Lock()
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defer cc.mu.Unlock()
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data := cc.marshalAttr([]netlink.Attribute{
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{Type: unix.NFTA_TABLE_NAME, Data: []byte(t.Name + "\x00")},
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{Type: unix.NFTA_TABLE_FLAGS, Data: []byte{0, 0, 0, 0}},
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})
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cc.messages = append(cc.messages, netlink.Message{
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Header: netlink.Header{
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Type: netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELTABLE),
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Flags: netlink.Request | netlink.Acknowledge,
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},
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Data: append(extraHeader(uint8(t.Family), 0), data...),
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})
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}
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func (cc *Conn) addTable(t *Table, flag netlink.HeaderFlags) *Table {
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cc.mu.Lock()
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defer cc.mu.Unlock()
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data := cc.marshalAttr([]netlink.Attribute{
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{Type: unix.NFTA_TABLE_NAME, Data: []byte(t.Name + "\x00")},
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{Type: unix.NFTA_TABLE_FLAGS, Data: []byte{0, 0, 0, 0}},
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})
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cc.messages = append(cc.messages, netlink.Message{
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Header: netlink.Header{
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Type: netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWTABLE),
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Flags: netlink.Request | netlink.Acknowledge | flag,
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},
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Data: append(extraHeader(uint8(t.Family), 0), data...),
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})
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return t
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}
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// AddTable adds the specified Table, just like `nft add table ...`.
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// See also https://wiki.nftables.org/wiki-nftables/index.php/Configuring_tables
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func (cc *Conn) AddTable(t *Table) *Table {
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return cc.addTable(t, netlink.Create)
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}
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// CreateTable create the specified Table if it do not existed.
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// just like `nft create table ...`.
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func (cc *Conn) CreateTable(t *Table) *Table {
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return cc.addTable(t, netlink.Excl)
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}
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// FlushTable removes all rules in all chains within the specified Table. See also
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// https://wiki.nftables.org/wiki-nftables/index.php/Configuring_tables#Flushing_tables
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func (cc *Conn) FlushTable(t *Table) {
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cc.mu.Lock()
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defer cc.mu.Unlock()
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data := cc.marshalAttr([]netlink.Attribute{
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{Type: unix.NFTA_RULE_TABLE, Data: []byte(t.Name + "\x00")},
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})
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cc.messages = append(cc.messages, netlink.Message{
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Header: netlink.Header{
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Type: netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELRULE),
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Flags: netlink.Request | netlink.Acknowledge,
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},
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Data: append(extraHeader(uint8(t.Family), 0), data...),
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})
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}
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// ListTable returns table found for the specified name. Searches for
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// the table under IPv4 family. As per nft man page: "When no address
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// family is specified, ip is used by default."
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func (cc *Conn) ListTable(name string) (*Table, error) {
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return cc.ListTableOfFamily(name, TableFamilyIPv4)
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}
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// ListTableOfFamily returns table found for the specified name and table family
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func (cc *Conn) ListTableOfFamily(name string, family TableFamily) (*Table, error) {
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t, err := cc.listTablesOfNameAndFamily(name, family)
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if err != nil {
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return nil, err
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}
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if got, want := len(t), 1; got != want {
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return nil, fmt.Errorf("expected table count %d, got %d", want, got)
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}
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return t[0], nil
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}
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// ListTables returns currently configured tables in the kernel
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func (cc *Conn) ListTables() ([]*Table, error) {
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return cc.ListTablesOfFamily(TableFamilyUnspecified)
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}
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// ListTablesOfFamily returns currently configured tables for the specified table family
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// in the kernel. It lists all tables if family is TableFamilyUnspecified.
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func (cc *Conn) ListTablesOfFamily(family TableFamily) ([]*Table, error) {
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return cc.listTablesOfNameAndFamily("", family)
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}
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func (cc *Conn) listTablesOfNameAndFamily(name string, family TableFamily) ([]*Table, error) {
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conn, closer, err := cc.netlinkConn()
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if err != nil {
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return nil, err
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}
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defer func() { _ = closer() }()
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data := extraHeader(uint8(family), 0)
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flags := netlink.Request | netlink.Dump
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if name != "" {
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data = append(data, cc.marshalAttr([]netlink.Attribute{
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{Type: unix.NFTA_TABLE_NAME, Data: []byte(name + "\x00")},
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})...)
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flags = netlink.Request
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}
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msg := netlink.Message{
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Header: netlink.Header{
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Type: netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_GETTABLE),
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Flags: flags,
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},
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Data: data,
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}
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response, err := conn.Execute(msg)
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if err != nil {
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return nil, err
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}
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var tables []*Table
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for _, m := range response {
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t, err := tableFromMsg(m)
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if err != nil {
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return nil, err
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}
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tables = append(tables, t)
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}
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return tables, nil
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}
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func tableFromMsg(msg netlink.Message) (*Table, error) {
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if got, want1, want2 := msg.Header.Type, newTableHeaderType, delTableHeaderType; got != want1 && got != want2 {
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return nil, fmt.Errorf("unexpected header type: got %v, want %v or %v", got, want1, want2)
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}
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var t Table
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t.Family = TableFamily(msg.Data[0])
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ad, err := netlink.NewAttributeDecoder(msg.Data[4:])
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if err != nil {
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return nil, err
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}
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for ad.Next() {
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switch ad.Type() {
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case unix.NFTA_TABLE_NAME:
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t.Name = ad.String()
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case unix.NFTA_TABLE_USE:
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t.Use = ad.Uint32()
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case unix.NFTA_TABLE_FLAGS:
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t.Flags = ad.Uint32()
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}
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}
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return &t, nil
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}
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