66 lines
2.2 KiB
Go
66 lines
2.2 KiB
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 expr
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import (
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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 NATType uint32
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// Possible NATType values.
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const (
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NATTypeSourceNAT NATType = unix.NFT_NAT_SNAT
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NATTypeDestNAT NATType = unix.NFT_NAT_DNAT
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)
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type NAT struct {
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Type NATType
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Family uint32 // TODO: typed const
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RegAddrMin uint32
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RegProtoMin uint32
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}
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// |00048|N-|00001| |len |flags| type|
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// |00008|--|00001| |len |flags| type|
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// | 6e 61 74 00 | | data | n a t
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// |00036|N-|00002| |len |flags| type|
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// |00008|--|00001| |len |flags| type| NFTA_NAT_TYPE
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// | 00 00 00 01 | | data | NFT_NAT_DNAT
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// |00008|--|00002| |len |flags| type| NFTA_NAT_FAMILY
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// | 00 00 00 02 | | data | NFPROTO_IPV4
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// |00008|--|00003| |len |flags| type| NFTA_NAT_REG_ADDR_MIN
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// | 00 00 00 01 | | data | reg 1
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// |00008|--|00005| |len |flags| type| NFTA_NAT_REG_PROTO_MIN
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// | 00 00 00 02 | | data | reg 2
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func (e *NAT) marshal() ([]byte, error) {
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data, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: unix.NFTA_NAT_TYPE, Data: binaryutil.BigEndian.PutUint32(uint32(e.Type))},
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{Type: unix.NFTA_NAT_FAMILY, Data: binaryutil.BigEndian.PutUint32(e.Family)},
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{Type: unix.NFTA_NAT_REG_ADDR_MIN, Data: binaryutil.BigEndian.PutUint32(e.RegAddrMin)},
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{Type: unix.NFTA_NAT_REG_PROTO_MIN, Data: binaryutil.BigEndian.PutUint32(e.RegProtoMin)},
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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("nat\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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