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// Copyright 2021 The gVisor Authors.
//
// 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 integration_test
import (
"testing"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/link/channel"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
type inputIfNameMatcher struct {
name string
}
var _ stack.Matcher = (*inputIfNameMatcher)(nil)
func (*inputIfNameMatcher) Name() string {
return "inputIfNameMatcher"
}
func (im *inputIfNameMatcher) Match(hook stack.Hook, _ *stack.PacketBuffer, inNicName, _ string) (bool, bool) {
return (hook == stack.Input && im.name != "" && im.name == inNicName), false
}
const (
nicID = 1
nicName = "nic1"
anotherNicName = "nic2"
linkAddr = tcpip.LinkAddress("\x0a\x0b\x0c\x0d\x0e\x0e")
srcAddrV4 = "\x0a\x00\x00\x01"
dstAddrV4 = "\x0a\x00\x00\x02"
srcAddrV6 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"
dstAddrV6 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02"
payloadSize = 20
)
func genStackV6(t *testing.T) (*stack.Stack, *channel.Endpoint) {
t.Helper()
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocolFactory{ipv6.NewProtocol},
})
e := channel.New(0, header.IPv6MinimumMTU, linkAddr)
nicOpts := stack.NICOptions{Name: nicName}
if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil {
t.Fatalf("CreateNICWithOptions(%d, _, %#v) = %s", nicID, nicOpts, err)
}
if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, dstAddrV6); err != nil {
t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, dstAddrV6, err)
}
return s, e
}
func genStackV4(t *testing.T) (*stack.Stack, *channel.Endpoint) {
t.Helper()
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol},
})
e := channel.New(0, header.IPv4MinimumMTU, linkAddr)
nicOpts := stack.NICOptions{Name: nicName}
if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil {
t.Fatalf("CreateNICWithOptions(%d, _, %#v) = %s", nicID, nicOpts, err)
}
if err := s.AddAddress(nicID, header.IPv4ProtocolNumber, dstAddrV4); err != nil {
t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv4ProtocolNumber, dstAddrV4, err)
}
return s, e
}
func genPacketV6() *stack.PacketBuffer {
pktSize := header.IPv6MinimumSize + payloadSize
hdr := buffer.NewPrependable(pktSize)
ip := header.IPv6(hdr.Prepend(pktSize))
ip.Encode(&header.IPv6Fields{
PayloadLength: payloadSize,
TransportProtocol: 99,
HopLimit: 255,
SrcAddr: srcAddrV6,
DstAddr: dstAddrV6,
})
vv := hdr.View().ToVectorisedView()
return stack.NewPacketBuffer(stack.PacketBufferOptions{Data: vv})
}
func genPacketV4() *stack.PacketBuffer {
pktSize := header.IPv4MinimumSize + payloadSize
hdr := buffer.NewPrependable(pktSize)
ip := header.IPv4(hdr.Prepend(pktSize))
ip.Encode(&header.IPv4Fields{
TOS: 0,
TotalLength: uint16(pktSize),
ID: 1,
Flags: 0,
FragmentOffset: 16,
TTL: 48,
Protocol: 99,
SrcAddr: srcAddrV4,
DstAddr: dstAddrV4,
})
ip.SetChecksum(0)
ip.SetChecksum(^ip.CalculateChecksum())
vv := hdr.View().ToVectorisedView()
return stack.NewPacketBuffer(stack.PacketBufferOptions{Data: vv})
}
func TestIPTablesStatsForInput(t *testing.T) {
tests := []struct {
name string
setupStack func(*testing.T) (*stack.Stack, *channel.Endpoint)
setupFilter func(*testing.T, *stack.Stack)
genPacket func() *stack.PacketBuffer
proto tcpip.NetworkProtocolNumber
expectReceived int
expectInputDropped int
}{
{
name: "IPv6 Accept",
setupStack: genStackV6,
setupFilter: func(*testing.T, *stack.Stack) { /* no filter */ },
genPacket: genPacketV6,
proto: header.IPv6ProtocolNumber,
expectReceived: 1,
expectInputDropped: 0,
},
{
name: "IPv4 Accept",
setupStack: genStackV4,
setupFilter: func(*testing.T, *stack.Stack) { /* no filter */ },
genPacket: genPacketV4,
proto: header.IPv4ProtocolNumber,
expectReceived: 1,
expectInputDropped: 0,
},
{
name: "IPv6 Drop (input interface matches)",
setupStack: genStackV6,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, true /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Filter = stack.IPHeaderFilter{InputInterface: nicName}
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx].Matchers = []stack.Matcher{&inputIfNameMatcher{nicName}}
// Make sure the packet is not dropped by the next rule.
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, true /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, true, err)
}
},
genPacket: genPacketV6,
proto: header.IPv6ProtocolNumber,
expectReceived: 1,
expectInputDropped: 1,
},
{
name: "IPv4 Drop (input interface matches)",
setupStack: genStackV4,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, false /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Filter = stack.IPHeaderFilter{InputInterface: nicName}
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx].Matchers = []stack.Matcher{&inputIfNameMatcher{nicName}}
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, false /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, false, err)
}
},
genPacket: genPacketV4,
proto: header.IPv4ProtocolNumber,
expectReceived: 1,
expectInputDropped: 1,
},
{
name: "IPv6 Accept (input interface does not match)",
setupStack: genStackV6,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, true /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Filter = stack.IPHeaderFilter{InputInterface: anotherNicName}
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, true /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, true, err)
}
},
genPacket: genPacketV6,
proto: header.IPv6ProtocolNumber,
expectReceived: 1,
expectInputDropped: 0,
},
{
name: "IPv4 Accept (input interface does not match)",
setupStack: genStackV4,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, false /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Filter = stack.IPHeaderFilter{InputInterface: anotherNicName}
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, false /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, false, err)
}
},
genPacket: genPacketV4,
proto: header.IPv4ProtocolNumber,
expectReceived: 1,
expectInputDropped: 0,
},
{
name: "IPv6 Drop (input interface does not match but invert is true)",
setupStack: genStackV6,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, true /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Filter = stack.IPHeaderFilter{
InputInterface: anotherNicName,
InputInterfaceInvert: true,
}
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, true /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, true, err)
}
},
genPacket: genPacketV6,
proto: header.IPv6ProtocolNumber,
expectReceived: 1,
expectInputDropped: 1,
},
{
name: "IPv4 Drop (input interface does not match but invert is true)",
setupStack: genStackV4,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, false /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Filter = stack.IPHeaderFilter{
InputInterface: anotherNicName,
InputInterfaceInvert: true,
}
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, false /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, false, err)
}
},
genPacket: genPacketV4,
proto: header.IPv4ProtocolNumber,
expectReceived: 1,
expectInputDropped: 1,
},
{
name: "IPv6 Accept (input interface does not match using a matcher)",
setupStack: genStackV6,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, true /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx].Matchers = []stack.Matcher{&inputIfNameMatcher{anotherNicName}}
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, true /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, true, err)
}
},
genPacket: genPacketV6,
proto: header.IPv6ProtocolNumber,
expectReceived: 1,
expectInputDropped: 0,
},
{
name: "IPv4 Accept (input interface does not match using a matcher)",
setupStack: genStackV4,
setupFilter: func(t *testing.T, s *stack.Stack) {
t.Helper()
ipt := s.IPTables()
filter := ipt.GetTable(stack.FilterID, false /* ipv6 */)
ruleIdx := filter.BuiltinChains[stack.Input]
filter.Rules[ruleIdx].Target = &stack.DropTarget{}
filter.Rules[ruleIdx].Matchers = []stack.Matcher{&inputIfNameMatcher{anotherNicName}}
filter.Rules[ruleIdx+1].Target = &stack.AcceptTarget{}
if err := ipt.ReplaceTable(stack.FilterID, filter, false /* ipv6 */); err != nil {
t.Fatalf("ipt.RelaceTable(%d, _, %t): %s", stack.FilterID, false, err)
}
},
genPacket: genPacketV4,
proto: header.IPv4ProtocolNumber,
expectReceived: 1,
expectInputDropped: 0,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s, e := test.setupStack(t)
test.setupFilter(t, s)
e.InjectInbound(test.proto, test.genPacket())
if got := int(s.Stats().IP.PacketsReceived.Value()); got != test.expectReceived {
t.Errorf("got PacketReceived = %d, want = %d", got, test.expectReceived)
}
if got := int(s.Stats().IP.IPTablesInputDropped.Value()); got != test.expectInputDropped {
t.Errorf("got IPTablesInputDropped = %d, want = %d", got, test.expectInputDropped)
}
})
}
}
|
