tproxy expression support and test (#32)
Add support for tproxy expression Signed-off-by: Serguei Bezverkhi <sbezverk@cisco.com>
This commit is contained in:
Serguei Bezverkhi
Michael Stapelberg
parent
d22d8d0641
commit
7a68526274
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@ -0,0 +1,68 @@
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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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"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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// NFTA_TPROXY_FAMILY defines attribute for a table family
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NFTA_TPROXY_FAMILY = 0x01
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// NFTA_TPROXY_REG defines attribute for a register carrying redirection port value
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NFTA_TPROXY_REG = 0x03
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)
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// TProxy defines struct with parameters for the transparent proxy
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type TProxy struct {
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Family byte
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TableFamily byte
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RegPort uint32
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}
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func (e *TProxy) marshal() ([]byte, error) {
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data, err := netlink.MarshalAttributes([]netlink.Attribute{
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{Type: NFTA_TPROXY_FAMILY, Data: binaryutil.BigEndian.PutUint32(uint32(e.Family))},
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{Type: NFTA_TPROXY_REG, Data: binaryutil.BigEndian.PutUint32(e.RegPort)},
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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("tproxy\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 *TProxy) 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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for ad.Next() {
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switch ad.Type() {
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case NFTA_TPROXY_FAMILY:
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e.Family = ad.Uint8()
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case NFTA_TPROXY_REG:
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e.RegPort = ad.Uint32()
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}
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}
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return ad.Err()
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}
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@ -561,6 +561,69 @@ func TestAddCounter(t *testing.T) {
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}
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}
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func TestTProxy(t *testing.T) {
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want := [][]byte{
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// batch begin
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[]byte("\x00\x00\x00\x0a"),
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// nft add rule filter divert ip protocol tcp tproxy to :50080
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[]byte("\x02\x00\x00\x00\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x0b\x00\x02\x00\x64\x69\x76\x65\x72\x74\x00\x00\xb4\x00\x04\x80\x34\x00\x01\x80\x0c\x00\x01\x00\x70\x61\x79\x6c\x6f\x61\x64\x00\x24\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x01\x08\x00\x03\x00\x00\x00\x00\x09\x08\x00\x04\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\x05\x00\x01\x00\x06\x00\x00\x00\x2c\x00\x01\x80\x0e\x00\x01\x00\x69\x6d\x6d\x65\x64\x69\x61\x74\x65\x00\x00\x00\x18\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x0c\x00\x02\x80\x06\x00\x01\x00\xc3\xa0\x00\x00\x24\x00\x01\x80\x0b\x00\x01\x00\x74\x70\x72\x6f\x78\x79\x00\x00\x14\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x02\x08\x00\x03\x00\x00\x00\x00\x01"),
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// batch end
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[]byte("\x00\x00\x00\x0a"),
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}
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c := &nftables.Conn{
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TestDial: func(req []netlink.Message) ([]netlink.Message, error) {
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for idx, msg := range req {
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b, err := msg.MarshalBinary()
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if err != nil {
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t.Fatal(err)
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}
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if len(b) < 16 {
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continue
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}
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b = b[16:]
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if len(want) == 0 {
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t.Errorf("no want entry for message %d: %x", idx, b)
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continue
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}
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if got, want := b, want[0]; !bytes.Equal(got, want) {
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t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
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}
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want = want[1:]
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}
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return req, nil
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},
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}
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c.AddRule(&nftables.Rule{
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Table: &nftables.Table{Name: "filter", Family: nftables.TableFamilyIPv4},
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Chain: &nftables.Chain{
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Name: "divert",
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Type: nftables.ChainTypeFilter,
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Hooknum: nftables.ChainHookPrerouting,
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Priority: -150,
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},
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Exprs: []expr.Any{
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// [ payload load 1b @ network header + 9 => reg 1 ]
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&expr.Payload{DestRegister: 1, Base: expr.PayloadBaseNetworkHeader, Offset: 9, Len: 1},
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// [ cmp eq reg 1 0x00000006 ]
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&expr.Cmp{Op: expr.CmpOpEq, Register: 1, Data: []byte{unix.IPPROTO_TCP}},
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// [ immediate reg 1 0x0000a0c3 ]
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&expr.Immediate{Register: 1, Data: binaryutil.BigEndian.PutUint16(50080)},
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// [ tproxy ip port reg 1 ]
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&expr.TProxy{
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Family: byte(nftables.TableFamilyIPv4),
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TableFamily: byte(nftables.TableFamilyIPv4),
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RegPort: 1,
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},
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},
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})
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if err := c.Flush(); err != nil {
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t.Fatal(err)
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}
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}
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func TestAddChain(t *testing.T) {
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tests := []struct {
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name string
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