add exprs and test for TCP MSS clamping
This commit is contained in:
Michael Stapelberg
parent
efc2089755
commit
9ac63cb282
|
|
@ -0,0 +1,65 @@
|
|||
// 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 Bitwise struct {
|
||||
SourceRegister uint32
|
||||
DestRegister uint32
|
||||
Len uint32
|
||||
Mask []byte
|
||||
Xor []byte
|
||||
}
|
||||
|
||||
func (e *Bitwise) marshal() ([]byte, error) {
|
||||
mask, err := netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_DATA_VALUE, Data: e.Mask},
|
||||
})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
xor, err := netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_DATA_VALUE, Data: e.Xor},
|
||||
})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
data, err := netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_BITWISE_SREG, Data: binaryutil.BigEndian.PutUint32(e.SourceRegister)},
|
||||
{Type: unix.NFTA_BITWISE_DREG, Data: binaryutil.BigEndian.PutUint32(e.DestRegister)},
|
||||
{Type: unix.NFTA_BITWISE_LEN, Data: binaryutil.BigEndian.PutUint32(e.Len)},
|
||||
{Type: unix.NLA_F_NESTED | unix.NFTA_BITWISE_MASK, Data: mask},
|
||||
{Type: unix.NLA_F_NESTED | unix.NFTA_BITWISE_XOR, Data: xor},
|
||||
})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_EXPR_NAME, Data: []byte("bitwise\x00")},
|
||||
{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
|
||||
})
|
||||
}
|
||||
|
||||
func (e *Bitwise) unmarshal(data []byte) error {
|
||||
return fmt.Errorf("not yet implemented")
|
||||
}
|
||||
|
|
@ -0,0 +1,59 @@
|
|||
// 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 ByteorderOp uint32
|
||||
|
||||
const (
|
||||
ByteorderNtoh ByteorderOp = unix.NFT_BYTEORDER_NTOH
|
||||
ByteorderHton ByteorderOp = unix.NFT_BYTEORDER_HTON
|
||||
)
|
||||
|
||||
type Byteorder struct {
|
||||
SourceRegister uint32
|
||||
DestRegister uint32
|
||||
Op ByteorderOp
|
||||
Len uint32
|
||||
Size uint32
|
||||
}
|
||||
|
||||
func (e *Byteorder) marshal() ([]byte, error) {
|
||||
data, err := netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_BYTEORDER_SREG, Data: binaryutil.BigEndian.PutUint32(e.SourceRegister)},
|
||||
{Type: unix.NFTA_BYTEORDER_DREG, Data: binaryutil.BigEndian.PutUint32(e.DestRegister)},
|
||||
{Type: unix.NFTA_BYTEORDER_OP, Data: binaryutil.BigEndian.PutUint32(uint32(e.Op))},
|
||||
{Type: unix.NFTA_BYTEORDER_LEN, Data: binaryutil.BigEndian.PutUint32(e.Len)},
|
||||
{Type: unix.NFTA_BYTEORDER_SIZE, Data: binaryutil.BigEndian.PutUint32(e.Size)},
|
||||
})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_EXPR_NAME, Data: []byte("byteorder\x00")},
|
||||
{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
|
||||
})
|
||||
}
|
||||
|
||||
func (e *Byteorder) unmarshal(data []byte) error {
|
||||
return fmt.Errorf("not yet implemented")
|
||||
}
|
||||
|
|
@ -0,0 +1,64 @@
|
|||
// 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 ExthdrOp uint32
|
||||
|
||||
const (
|
||||
ExthdrOpIpv6 ExthdrOp = unix.NFT_EXTHDR_OP_IPV6
|
||||
ExthdrOpTcpopt ExthdrOp = unix.NFT_EXTHDR_OP_TCPOPT
|
||||
)
|
||||
|
||||
type Exthdr struct {
|
||||
DestRegister uint32
|
||||
Type uint8
|
||||
Offset uint32
|
||||
Len uint32
|
||||
Flags uint32
|
||||
Op ExthdrOp
|
||||
SourceRegister uint32
|
||||
}
|
||||
|
||||
func (e *Exthdr) marshal() ([]byte, error) {
|
||||
data, err := netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_EXTHDR_SREG, Data: binaryutil.BigEndian.PutUint32(e.SourceRegister)},
|
||||
{Type: unix.NFTA_EXTHDR_TYPE, Data: []byte{e.Type}},
|
||||
{Type: unix.NFTA_EXTHDR_OFFSET, Data: binaryutil.BigEndian.PutUint32(e.Offset)},
|
||||
{Type: unix.NFTA_EXTHDR_LEN, Data: binaryutil.BigEndian.PutUint32(e.Len)},
|
||||
// TODO: these fields seem to be conditional?
|
||||
//{Type: unix.NFTA_EXTHDR_DREG, Data: binaryutil.BigEndian.PutUint32(e.DestRegister)},
|
||||
//{Type: unix.NFTA_EXTHDR_FLAGS, Data: binaryutil.BigEndian.PutUint32(e.Flags)},
|
||||
{Type: unix.NFTA_EXTHDR_OP, Data: binaryutil.BigEndian.PutUint32(uint32(e.Op))},
|
||||
})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_EXPR_NAME, Data: []byte("exthdr\x00")},
|
||||
{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
|
||||
})
|
||||
}
|
||||
|
||||
func (e *Exthdr) unmarshal(data []byte) error {
|
||||
return fmt.Errorf("not yet implemented")
|
||||
}
|
||||
|
|
@ -0,0 +1,55 @@
|
|||
// 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 RtKey uint32
|
||||
|
||||
const (
|
||||
RtClassid RtKey = unix.NFT_RT_CLASSID
|
||||
RtNexthop4 RtKey = unix.NFT_RT_NEXTHOP4
|
||||
RtNexthop6 RtKey = unix.NFT_RT_NEXTHOP6
|
||||
RtTCPMSS RtKey = unix.NFT_RT_TCPMSS
|
||||
)
|
||||
|
||||
type Rt struct {
|
||||
Register uint32
|
||||
Key RtKey
|
||||
}
|
||||
|
||||
func (e *Rt) marshal() ([]byte, error) {
|
||||
data, err := netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_RT_KEY, Data: binaryutil.BigEndian.PutUint32(uint32(e.Key))},
|
||||
{Type: unix.NFTA_RT_DREG, Data: binaryutil.BigEndian.PutUint32(e.Register)},
|
||||
})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return netlink.MarshalAttributes([]netlink.Attribute{
|
||||
{Type: unix.NFTA_EXPR_NAME, Data: []byte("rt\x00")},
|
||||
{Type: unix.NLA_F_NESTED | unix.NFTA_EXPR_DATA, Data: data},
|
||||
})
|
||||
}
|
||||
|
||||
func (e *Rt) unmarshal(data []byte) error {
|
||||
return fmt.Errorf("not yet implemented")
|
||||
}
|
||||
183
nftables_test.go
183
nftables_test.go
|
|
@ -16,7 +16,9 @@ package nftables_test
|
|||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"net"
|
||||
"strings"
|
||||
"testing"
|
||||
|
||||
"github.com/google/nftables"
|
||||
|
|
@ -26,6 +28,46 @@ import (
|
|||
"golang.org/x/sys/unix"
|
||||
)
|
||||
|
||||
// nfdump returns a hexdump of 4 bytes per line (like nft --debug=all), allowing
|
||||
// users to make sense of large byte literals more easily.
|
||||
func nfdump(b []byte) string {
|
||||
var buf bytes.Buffer
|
||||
i := 0
|
||||
for ; i < len(b); i += 4 {
|
||||
// TODO: show printable characters as ASCII
|
||||
fmt.Fprintf(&buf, "%02x %02x %02x %02x\n",
|
||||
b[i],
|
||||
b[i+1],
|
||||
b[i+2],
|
||||
b[i+3])
|
||||
}
|
||||
for ; i < len(b); i++ {
|
||||
fmt.Fprintf(&buf, "%02x ", b[i])
|
||||
}
|
||||
return buf.String()
|
||||
}
|
||||
|
||||
// linediff returns a side-by-side diff of two nfdump() return values, flagging
|
||||
// lines which are not equal with an exclamation point prefix.
|
||||
func linediff(a, b string) string {
|
||||
var buf bytes.Buffer
|
||||
fmt.Fprintf(&buf, "got -- want\n")
|
||||
linesA := strings.Split(a, "\n")
|
||||
linesB := strings.Split(b, "\n")
|
||||
for idx, lineA := range linesA {
|
||||
if idx >= len(linesB) {
|
||||
break
|
||||
}
|
||||
lineB := linesB[idx]
|
||||
prefix := "! "
|
||||
if lineA == lineB {
|
||||
prefix = " "
|
||||
}
|
||||
fmt.Fprintf(&buf, "%s%s -- %s\n", prefix, lineA, lineB)
|
||||
}
|
||||
return buf.String()
|
||||
}
|
||||
|
||||
func ifname(n string) []byte {
|
||||
b := make([]byte, 16)
|
||||
copy(b, []byte(n+"\x00"))
|
||||
|
|
@ -75,7 +117,7 @@ func TestConfigureNAT(t *testing.T) {
|
|||
continue
|
||||
}
|
||||
if got, want := b, want[0]; !bytes.Equal(got, want) {
|
||||
t.Errorf("message %d: got %x, want %x", idx, got, want)
|
||||
t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
|
||||
}
|
||||
want = want[1:]
|
||||
}
|
||||
|
|
@ -284,7 +326,7 @@ func TestGetRule(t *testing.T) {
|
|||
continue
|
||||
}
|
||||
if got, want := b, want[0]; !bytes.Equal(got, want) {
|
||||
t.Errorf("message %d: got %#v, want %#v", idx, got, want)
|
||||
t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
|
||||
}
|
||||
want = want[1:]
|
||||
}
|
||||
|
|
@ -363,7 +405,7 @@ func TestAddCounter(t *testing.T) {
|
|||
continue
|
||||
}
|
||||
if got, want := b, want[0]; !bytes.Equal(got, want) {
|
||||
t.Errorf("message %d: got %x, want %x", idx, got, want)
|
||||
t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
|
||||
}
|
||||
want = want[1:]
|
||||
}
|
||||
|
|
@ -426,7 +468,7 @@ func TestGetObjReset(t *testing.T) {
|
|||
continue
|
||||
}
|
||||
if got, want := b, want[0]; !bytes.Equal(got, want) {
|
||||
t.Errorf("message %d: got %#v, want %#v", idx, got, want)
|
||||
t.Errorf("message %d: %s", idx, linediff(nfdump(got), nfdump(want)))
|
||||
}
|
||||
want = want[1:]
|
||||
}
|
||||
|
|
@ -468,3 +510,136 @@ func TestGetObjReset(t *testing.T) {
|
|||
t.Errorf("unexpected number of bytes: got %d, want %d", got, want)
|
||||
}
|
||||
}
|
||||
|
||||
func TestConfigureClamping(t *testing.T) {
|
||||
// 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/Mangle_TCP_options
|
||||
want := [][]byte{
|
||||
// batch begin
|
||||
[]byte("\x00\x00\x00\x0a"),
|
||||
// nft flush ruleset
|
||||
[]byte("\x00\x00\x00\x00"),
|
||||
// nft add table ip filter
|
||||
[]byte("\x02\x00\x00\x00\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00"),
|
||||
// nft add chain filter forward '{' type filter hook forward priority 0 \; '}'
|
||||
[]byte("\x02\x00\x00\x00\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x0c\x00\x03\x00\x66\x6f\x72\x77\x61\x72\x64\x00\x14\x00\x04\x80\x08\x00\x01\x00\x00\x00\x00\x02\x08\x00\x02\x00\x00\x00\x00\x00\x0b\x00\x07\x00\x66\x69\x6c\x74\x65\x72\x00\x00"),
|
||||
// nft add rule ip filter forward oifname uplink0 tcp flags syn tcp option maxseg size set rt mtu
|
||||
[]byte("\x02\x00\x00\x00\x0b\x00\x01\x00\x66\x69\x6c\x74\x65\x72\x00\x00\x0c\x00\x02\x00\x66\x6f\x72\x77\x61\x72\x64\x00\xf0\x01\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\x07\x08\x00\x01\x00\x00\x00\x00\x01\x38\x00\x01\x80\x08\x00\x01\x00\x63\x6d\x70\x00\x2c\x00\x02\x80\x08\x00\x01\x00\x00\x00\x00\x01\x08\x00\x02\x00\x00\x00\x00\x00\x18\x00\x03\x80\x14\x00\x01\x00\x75\x70\x6c\x69\x6e\x6b\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\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\x10\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\x05\x00\x01\x00\x06\x00\x00\x00\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\x02\x08\x00\x03\x00\x00\x00\x00\x0d\x08\x00\x04\x00\x00\x00\x00\x01\x44\x00\x01\x80\x0c\x00\x01\x00\x62\x69\x74\x77\x69\x73\x65\x00\x34\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\x01\x0c\x00\x04\x80\x05\x00\x01\x00\x02\x00\x00\x00\x0c\x00\x05\x80\x05\x00\x01\x00\x00\x00\x00\x00\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\x01\x0c\x00\x03\x80\x05\x00\x01\x00\x00\x00\x00\x00\x20\x00\x01\x80\x07\x00\x01\x00\x72\x74\x00\x00\x14\x00\x02\x80\x08\x00\x02\x00\x00\x00\x00\x03\x08\x00\x01\x00\x00\x00\x00\x01\x40\x00\x01\x80\x0e\x00\x01\x00\x62\x79\x74\x65\x6f\x72\x64\x65\x72\x00\x00\x00\x2c\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\x01\x08\x00\x04\x00\x00\x00\x00\x02\x08\x00\x05\x00\x00\x00\x00\x02\x3c\x00\x01\x80\x0b\x00\x01\x00\x65\x78\x74\x68\x64\x72\x00\x00\x2c\x00\x02\x80\x08\x00\x07\x00\x00\x00\x00\x01\x05\x00\x02\x00\x02\x00\x00\x00\x08\x00\x03\x00\x00\x00\x00\x02\x08\x00\x04\x00\x00\x00\x00\x02\x08\x00\x06\x00\x00\x00\x00\x01"),
|
||||
// batch end
|
||||
[]byte("\x00\x00\x00\x0a"),
|
||||
}
|
||||
|
||||
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: %s", idx, linediff(nfdump(got), nfdump(want)))
|
||||
}
|
||||
want = want[1:]
|
||||
}
|
||||
return req, nil
|
||||
},
|
||||
}
|
||||
|
||||
c.FlushRuleset()
|
||||
|
||||
filter := c.AddTable(&nftables.Table{
|
||||
Family: nftables.TableFamilyIPv4,
|
||||
Name: "filter",
|
||||
})
|
||||
|
||||
forward := c.AddChain(&nftables.Chain{
|
||||
Name: "forward",
|
||||
Table: filter,
|
||||
Type: nftables.ChainTypeFilter,
|
||||
Hooknum: nftables.ChainHookForward,
|
||||
Priority: nftables.ChainPriorityFilter,
|
||||
})
|
||||
|
||||
c.AddRule(&nftables.Rule{
|
||||
Table: filter,
|
||||
Chain: forward,
|
||||
Exprs: []expr.Any{
|
||||
// [ meta load oifname => reg 1 ]
|
||||
&expr.Meta{Key: expr.MetaKeyOIFNAME, Register: 1},
|
||||
// [ cmp eq reg 1 0x30707070 0x00000000 0x00000000 0x00000000 ]
|
||||
&expr.Cmp{
|
||||
Op: expr.CmpOpEq,
|
||||
Register: 1,
|
||||
Data: ifname("uplink0"),
|
||||
},
|
||||
|
||||
// [ meta load l4proto => reg 1 ]
|
||||
&expr.Meta{Key: expr.MetaKeyL4PROTO, Register: 1},
|
||||
// [ cmp eq reg 1 0x00000006 ]
|
||||
&expr.Cmp{
|
||||
Op: expr.CmpOpEq,
|
||||
Register: 1,
|
||||
Data: []byte{unix.IPPROTO_TCP},
|
||||
},
|
||||
|
||||
// [ payload load 1b @ transport header + 13 => reg 1 ]
|
||||
&expr.Payload{
|
||||
DestRegister: 1,
|
||||
Base: expr.PayloadBaseTransportHeader,
|
||||
Offset: 13, // TODO
|
||||
Len: 1, // TODO
|
||||
},
|
||||
// [ bitwise reg 1 = (reg=1 & 0x00000002 ) ^ 0x00000000 ]
|
||||
&expr.Bitwise{
|
||||
DestRegister: 1,
|
||||
SourceRegister: 1,
|
||||
Len: 1,
|
||||
Mask: []byte{0x02},
|
||||
Xor: []byte{0x00},
|
||||
},
|
||||
// [ cmp neq reg 1 0x00000000 ]
|
||||
&expr.Cmp{
|
||||
Op: expr.CmpOpNeq,
|
||||
Register: 1,
|
||||
Data: []byte{0x00},
|
||||
},
|
||||
|
||||
// [ rt load tcpmss => reg 1 ]
|
||||
&expr.Rt{
|
||||
Register: 1,
|
||||
Key: expr.RtTCPMSS,
|
||||
},
|
||||
// [ byteorder reg 1 = hton(reg 1, 2, 2) ]
|
||||
&expr.Byteorder{
|
||||
DestRegister: 1,
|
||||
SourceRegister: 1,
|
||||
Op: expr.ByteorderHton,
|
||||
Len: 2,
|
||||
Size: 2,
|
||||
},
|
||||
// [ exthdr write tcpopt reg 1 => 2b @ 2 + 2 ]
|
||||
&expr.Exthdr{
|
||||
SourceRegister: 1,
|
||||
Type: 2, // TODO
|
||||
Offset: 2,
|
||||
Len: 2,
|
||||
Op: expr.ExthdrOpTcpopt,
|
||||
},
|
||||
},
|
||||
})
|
||||
|
||||
if err := c.Flush(); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue