136 lines
3.5 KiB
Go
136 lines
3.5 KiB
Go
// 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 expr
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import (
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"encoding/binary"
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"github.com/google/nftables/binaryutil"
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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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// Fib defines fib expression structure
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type Fib struct {
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Register uint32
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ResultOIF bool
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ResultOIFNAME bool
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ResultADDRTYPE bool
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FlagSADDR bool
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FlagDADDR bool
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FlagMARK bool
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FlagIIF bool
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FlagOIF bool
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FlagPRESENT bool
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}
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func (e *Fib) marshal(fam byte) ([]byte, error) {
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data, err := e.marshalData(fam)
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if err != nil {
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return nil, err
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}
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return netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_EXPR_NAME, Data: []byte("fib\x00")},
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{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
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})
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}
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func (e *Fib) marshalData(fam byte) ([]byte, error) {
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data := []byte{}
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reg, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_FIB_DREG, Data: binaryutil.BigEndian.PutUint32(e.Register)},
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})
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if err != nil {
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return nil, err
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}
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data = append(data, reg...)
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flags := uint32(0)
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if e.FlagSADDR {
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flags |= unix.NFTA_FIB_F_SADDR
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}
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if e.FlagDADDR {
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flags |= unix.NFTA_FIB_F_DADDR
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}
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if e.FlagMARK {
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flags |= unix.NFTA_FIB_F_MARK
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}
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if e.FlagIIF {
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flags |= unix.NFTA_FIB_F_IIF
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}
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if e.FlagOIF {
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flags |= unix.NFTA_FIB_F_OIF
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}
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if e.FlagPRESENT {
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flags |= unix.NFTA_FIB_F_PRESENT
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}
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if flags != 0 {
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flg, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_FIB_FLAGS, Data: binaryutil.BigEndian.PutUint32(flags)},
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})
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if err != nil {
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return nil, err
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}
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data = append(data, flg...)
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}
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results := uint32(0)
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if e.ResultOIF {
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results |= unix.NFT_FIB_RESULT_OIF
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}
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if e.ResultOIFNAME {
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results |= unix.NFT_FIB_RESULT_OIFNAME
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}
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if e.ResultADDRTYPE {
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results |= unix.NFT_FIB_RESULT_ADDRTYPE
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}
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if results != 0 {
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rslt, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_FIB_RESULT, Data: binaryutil.BigEndian.PutUint32(results)},
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})
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if err != nil {
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return nil, err
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}
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data = append(data, rslt...)
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}
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return data, nil
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}
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func (e *Fib) unmarshal(fam byte, data []byte) error {
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ad, err := netlink.NewAttributeDecoder(data)
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if err != nil {
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return err
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}
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ad.ByteOrder = binary.BigEndian
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for ad.Next() {
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switch ad.Type() {
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case unix.NFTA_FIB_DREG:
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e.Register = ad.Uint32()
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case unix.NFTA_FIB_RESULT:
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result := ad.Uint32()
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e.ResultOIF = (result & unix.NFT_FIB_RESULT_OIF) == 1
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e.ResultOIFNAME = (result & unix.NFT_FIB_RESULT_OIFNAME) == 1
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e.ResultADDRTYPE = (result & unix.NFT_FIB_RESULT_ADDRTYPE) == 1
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case unix.NFTA_FIB_FLAGS:
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flags := ad.Uint32()
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e.FlagSADDR = (flags & unix.NFTA_FIB_F_SADDR) == 1
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e.FlagDADDR = (flags & unix.NFTA_FIB_F_DADDR) == 1
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e.FlagMARK = (flags & unix.NFTA_FIB_F_MARK) == 1
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e.FlagIIF = (flags & unix.NFTA_FIB_F_IIF) == 1
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e.FlagOIF = (flags & unix.NFTA_FIB_F_OIF) == 1
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e.FlagPRESENT = (flags & unix.NFTA_FIB_F_PRESENT) == 1
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}
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}
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return ad.Err()
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}
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