87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
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// Copyright 2019 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/mdlayher/netlink"
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"golang.org/x/sys/unix"
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)
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// Log defines type for NFT logging
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type Log struct {
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Key uint32
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Data []byte
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}
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func (e *Log) marshal() ([]byte, error) {
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var data []byte
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var err error
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switch e.Key {
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case unix.NFTA_LOG_GROUP:
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data, err = netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_LOG_GROUP, Data: e.Data},
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})
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case unix.NFTA_LOG_PREFIX:
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prefix := append(e.Data, '\x00')
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data, err = netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_LOG_PREFIX, Data: prefix},
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})
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case unix.NFTA_LOG_SNAPLEN:
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data, err = netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_LOG_SNAPLEN, Data: e.Data},
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})
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case unix.NFTA_LOG_QTHRESHOLD:
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data, err = netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_LOG_QTHRESHOLD, Data: e.Data},
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})
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case unix.NFTA_LOG_LEVEL:
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level := append(e.Data, '\x00')
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data, err = netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_LOG_LEVEL, Data: level},
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})
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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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return netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_EXPR_NAME, Data: []byte("log\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 *Log) unmarshal(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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if ad.Next() {
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e.Key = uint32(ad.Type())
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e.Data = ad.Bytes()
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switch e.Key {
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case unix.NFTA_LOG_PREFIX:
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fallthrough
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case unix.NFTA_LOG_LEVEL:
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// Getting rid of \x00 at the end of string
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e.Data = e.Data[:len(e.Data)-1]
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}
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}
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return ad.Err()
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}
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