116 lines
4.0 KiB
Go
116 lines
4.0 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 nftables_test
|
|
|
|
import (
|
|
"bytes"
|
|
"testing"
|
|
|
|
"github.com/google/nftables"
|
|
"github.com/google/nftables/expr"
|
|
"github.com/mdlayher/netlink"
|
|
)
|
|
|
|
func TestConfigureNAT(t *testing.T) {
|
|
// TODO: skip this test as non-root
|
|
// TODO: run this in its own network namespace to not mess with the host
|
|
|
|
// The want byte sequences come from stracing nft(8), e.g.:
|
|
// strace -f -v -x -s 2048 -eraw=sendto nft add table ip nat
|
|
//
|
|
// The nft(8) command sequence was taken from:
|
|
// https://wiki.nftables.org/wiki-nftables/index.php/Performing_Network_Address_Translation_(NAT)
|
|
want := [][]byte{
|
|
// batch begin
|
|
[]byte("\x00\x00\x0a\x00"),
|
|
// nft add table ip nat
|
|
[]byte("\x02\x00\x00\x00\x08\x00\x01\x00\x6e\x61\x74\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
|
|
// nft add chain nat prerouting '{' type nat hook prerouting priority 0 \; '}'
|
|
[]byte("\x02\x00\x00\x00\x08\x00\x01\x00\x6e\x61\x74\x00\x0f\x00\x03\x00\x70\x72\x65\x72\x6f\x75\x74\x69\x6e\x67\x00\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00\x08\x00\x07\x00\x6e\x61\x74\x00"),
|
|
// nft add chain nat postrouting { type nat hook postrouting priority 100 \; }
|
|
[]byte("\x02\x00\x00\x00\x08\x00\x01\x00\x6e\x61\x74\x00\x10\x00\x03\x00\x70\x6f\x73\x74\x72\x6f\x75\x74\x69\x6e\x67\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x04\x08\x00\x02\x00\x00\x00\x00\x64\x08\x00\x07\x00\x6e\x61\x74\x00"),
|
|
// nft add rule nat postrouting oif wlp4s0 masquerade
|
|
[]byte("\x02\x00\x00\x00\x08\x00\x01\x00\x6e\x61\x74\x00\x10\x00\x02\x00\x70\x6f\x73\x74\x72\x6f\x75\x74\x69\x6e\x67\x00\x68\x00\x04\x80\x24\x00\x01\x80\x09\x00\x01\x00\x6d\x65\x74\x61\x00\x00\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x05\x08\x00\x01\x00\x00\x00\x00\x01\x2c\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x20\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x0c\x00\x03\x80\x08\x00\x01\x00\x03\x00\x00\x00\x14\x00\x01\x80\x09\x00\x01\x00\x6d\x61\x73\x71\x00\x00\x00\x00\x04\x00\x02\x80"),
|
|
// batch end
|
|
[]byte("\x00\x00\x0a\x00"),
|
|
}
|
|
|
|
c := &nftables.Conn{
|
|
TestDial: func(req []netlink.Message) ([]netlink.Message, error) {
|
|
for idx, msg := range req {
|
|
b, err := msg.MarshalBinary()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if len(b) < 16 {
|
|
continue
|
|
}
|
|
b = b[16:]
|
|
if len(want) == 0 {
|
|
t.Errorf("no want entry for message %d: %x", idx, b)
|
|
continue
|
|
}
|
|
if got, want := b, want[0]; !bytes.Equal(got, want) {
|
|
t.Errorf("message %d: got %x, want %x", idx, got, want)
|
|
}
|
|
want = want[1:]
|
|
}
|
|
return req, nil
|
|
},
|
|
}
|
|
|
|
nat := c.AddTable(&nftables.Table{
|
|
Family: nftables.TableFamilyIPv4,
|
|
Name: "nat",
|
|
})
|
|
|
|
c.AddChain(&nftables.Chain{
|
|
Name: "prerouting",
|
|
Hooknum: nftables.ChainHookPrerouting,
|
|
Priority: nftables.ChainPriorityFilter,
|
|
Table: nat,
|
|
Type: nftables.ChainTypeNAT,
|
|
})
|
|
|
|
postrouting := c.AddChain(&nftables.Chain{
|
|
Name: "postrouting",
|
|
Hooknum: nftables.ChainHookPostrouting,
|
|
Priority: nftables.ChainPriorityNATSource,
|
|
Table: nat,
|
|
Type: nftables.ChainTypeNAT,
|
|
})
|
|
|
|
c.AddRule(&nftables.Rule{
|
|
Table: nat,
|
|
Chain: postrouting,
|
|
Exprs: []expr.Any{
|
|
// meta load oif => reg 1
|
|
&expr.Meta{Key: expr.MetaKeyOIF, Register: 1},
|
|
// cmp eq reg 1 0x00000003
|
|
&expr.Cmp{
|
|
Op: expr.CmpOpEq,
|
|
Register: 1,
|
|
Data: 3, /* wlp4s0 */
|
|
},
|
|
// masq
|
|
&expr.Masq{},
|
|
},
|
|
})
|
|
|
|
if err := c.Flush(); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|