nftables/expr/nat.go

77 lines
2.5 KiB
Go

// Copyright 2018 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expr
import (
"fmt"
"github.com/google/nftables/binaryutil"
"github.com/mdlayher/netlink"
"golang.org/x/sys/unix"
)
type NATType uint32
// Possible NATType values.
const (
NATTypeSourceNAT NATType = unix.NFT_NAT_SNAT
NATTypeDestNAT NATType = unix.NFT_NAT_DNAT
)
type NAT struct {
Type NATType
Family uint32 // TODO: typed const
RegAddrMin uint32
RegProtoMin uint32
RegProtoMax uint32
}
// |00048|N-|00001| |len |flags| type|
// |00008|--|00001| |len |flags| type|
// | 6e 61 74 00 | | data | n a t
// |00036|N-|00002| |len |flags| type|
// |00008|--|00001| |len |flags| type| NFTA_NAT_TYPE
// | 00 00 00 01 | | data | NFT_NAT_DNAT
// |00008|--|00002| |len |flags| type| NFTA_NAT_FAMILY
// | 00 00 00 02 | | data | NFPROTO_IPV4
// |00008|--|00003| |len |flags| type| NFTA_NAT_REG_ADDR_MIN
// | 00 00 00 01 | | data | reg 1
// |00008|--|00005| |len |flags| type| NFTA_NAT_REG_PROTO_MIN
// | 00 00 00 02 | | data | reg 2
func (e *NAT) marshal() ([]byte, error) {
attrs := []netlink.Attribute{
{Type: unix.NFTA_NAT_TYPE, Data: binaryutil.BigEndian.PutUint32(uint32(e.Type))},
{Type: unix.NFTA_NAT_FAMILY, Data: binaryutil.BigEndian.PutUint32(e.Family)},
{Type: unix.NFTA_NAT_REG_ADDR_MIN, Data: binaryutil.BigEndian.PutUint32(e.RegAddrMin)},
{Type: unix.NFTA_NAT_REG_PROTO_MIN, Data: binaryutil.BigEndian.PutUint32(e.RegProtoMin)},
}
if e.RegProtoMax > 0 {
attrs = append(attrs, netlink.Attribute{Type: unix.NFTA_NAT_REG_PROTO_MAX, Data: binaryutil.BigEndian.PutUint32(e.RegProtoMax)})
}
data, err := netlink.MarshalAttributes(attrs)
if err != nil {
return nil, err
}
return netlink.MarshalAttributes([]netlink.Attribute{
{Type: unix.NFTA_EXPR_NAME, Data: []byte("nat\x00")},
{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
})
}
func (e *NAT) unmarshal(data []byte) error {
return fmt.Errorf("not yet implemented")
}