86 lines
2.3 KiB
Go
86 lines
2.3 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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type QueueAttribute uint16
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type QueueFlag uint16
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// Possible QueueAttribute values
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const (
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QueueNum QueueAttribute = unix.NFTA_QUEUE_NUM
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QueueTotal QueueAttribute = unix.NFTA_QUEUE_TOTAL
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QueueFlags QueueAttribute = unix.NFTA_QUEUE_FLAGS
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QueueFlagBypass QueueFlag = unix.NFT_QUEUE_FLAG_BYPASS
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QueueFlagFanout QueueFlag = unix.NFT_QUEUE_FLAG_CPU_FANOUT
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QueueFlagMask QueueFlag = unix.NFT_QUEUE_FLAG_MASK
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)
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type Queue struct {
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Num uint16
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Total uint16
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Flag QueueFlag
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}
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func (e *Queue) 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("queue\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 *Queue) marshalData(fam byte) ([]byte, error) {
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if e.Total == 0 {
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e.Total = 1 // The total default value is 1
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}
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return netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_QUEUE_NUM, Data: binaryutil.BigEndian.PutUint16(e.Num)},
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{Type: unix.NFTA_QUEUE_TOTAL, Data: binaryutil.BigEndian.PutUint16(e.Total)},
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{Type: unix.NFTA_QUEUE_FLAGS, Data: binaryutil.BigEndian.PutUint16(uint16(e.Flag))},
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})
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}
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func (e *Queue) 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_QUEUE_NUM:
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e.Num = ad.Uint16()
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case unix.NFTA_QUEUE_TOTAL:
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e.Total = ad.Uint16()
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case unix.NFTA_QUEUE_FLAGS:
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e.Flag = QueueFlag(ad.Uint16())
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}
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}
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return ad.Err()
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}
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