71 lines
2.0 KiB
Go
71 lines
2.0 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/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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const (
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// Per https://git.netfilter.org/libnftnl/tree/include/linux/netfilter/nf_tables.h?id=84d12cfacf8ddd857a09435f3d982ab6250d250c#n1167
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NFTA_CONNLIMIT_UNSPEC = iota
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NFTA_CONNLIMIT_COUNT
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NFTA_CONNLIMIT_FLAGS
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NFT_CONNLIMIT_F_INV = 1
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)
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// Per https://git.netfilter.org/libnftnl/tree/src/expr/connlimit.c?id=84d12cfacf8ddd857a09435f3d982ab6250d250c
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type Connlimit struct {
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Count uint32
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Flags uint32
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}
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func (e *Connlimit) marshal(fam byte) ([]byte, error) {
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data, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: NFTA_CONNLIMIT_COUNT, Data: binaryutil.BigEndian.PutUint32(e.Count)},
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{Type: NFTA_CONNLIMIT_FLAGS, Data: binaryutil.BigEndian.PutUint32(e.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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return netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_EXPR_NAME, Data: []byte("connlimit\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 *Connlimit) 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 NFTA_CONNLIMIT_COUNT:
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e.Count = binaryutil.BigEndian.Uint32(ad.Bytes())
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case NFTA_CONNLIMIT_FLAGS:
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e.Flags = binaryutil.BigEndian.Uint32(ad.Bytes())
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}
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}
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return ad.Err()
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}
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