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// Copyright 2019 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 ipv6
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/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
)
const (
addr1 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"
addr2 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02"
// The least significant 3 bytes are the same as addr2 so both addr2 and
// addr3 will have the same solicited-node address.
addr3 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x02"
)
// testReceiveICMP tests receiving an ICMP packet from src to dst. want is the
// expected Neighbor Advertisement received count after receiving the packet.
func testReceiveICMP(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64) {
t.Helper()
// Receive ICMP packet.
hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.ICMPv6NeighborAdvertSize)
pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborAdvertSize))
pkt.SetType(header.ICMPv6NeighborAdvert)
pkt.SetChecksum(header.ICMPv6Checksum(pkt, src, dst, buffer.VectorisedView{}))
payloadLength := hdr.UsedLength()
ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
ip.Encode(&header.IPv6Fields{
PayloadLength: uint16(payloadLength),
NextHeader: uint8(header.ICMPv6ProtocolNumber),
HopLimit: 255,
SrcAddr: src,
DstAddr: dst,
})
e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
stats := s.Stats().ICMP.V6PacketsReceived
if got := stats.NeighborAdvert.Value(); got != want {
t.Fatalf("got NeighborAdvert = %d, want = %d", got, want)
}
}
// testReceiveICMP tests receiving a UDP packet from src to dst. want is the
// expected UDP received count after receiving the packet.
func testReceiveUDP(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64) {
t.Helper()
wq := waiter.Queue{}
we, ch := waiter.NewChannelEntry(nil)
wq.EventRegister(&we, waiter.EventIn)
defer wq.EventUnregister(&we)
defer close(ch)
ep, err := s.NewEndpoint(udp.ProtocolNumber, ProtocolNumber, &wq)
if err != nil {
t.Fatalf("NewEndpoint failed: %v", err)
}
defer ep.Close()
if err := ep.Bind(tcpip.FullAddress{Addr: dst, Port: 80}); err != nil {
t.Fatalf("ep.Bind(...) failed: %v", err)
}
// Receive UDP Packet.
hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.UDPMinimumSize)
u := header.UDP(hdr.Prepend(header.UDPMinimumSize))
u.Encode(&header.UDPFields{
SrcPort: 5555,
DstPort: 80,
Length: header.UDPMinimumSize,
})
// UDP pseudo-header checksum.
sum := header.PseudoHeaderChecksum(udp.ProtocolNumber, src, dst, header.UDPMinimumSize)
// UDP checksum
sum = header.Checksum(header.UDP([]byte{}), sum)
u.SetChecksum(^u.CalculateChecksum(sum))
payloadLength := hdr.UsedLength()
ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
ip.Encode(&header.IPv6Fields{
PayloadLength: uint16(payloadLength),
NextHeader: uint8(udp.ProtocolNumber),
HopLimit: 255,
SrcAddr: src,
DstAddr: dst,
})
e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
stat := s.Stats().UDP.PacketsReceived
if got := stat.Value(); got != want {
t.Fatalf("got UDPPacketsReceived = %d, want = %d", got, want)
}
}
// TestReceiveOnAllNodesMulticastAddr tests that IPv6 endpoints receive ICMP and
// UDP packets destined to the IPv6 link-local all-nodes multicast address.
func TestReceiveOnAllNodesMulticastAddr(t *testing.T) {
tests := []struct {
name string
protocolFactory stack.TransportProtocol
rxf func(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64)
}{
{"ICMP", icmp.NewProtocol6(), testReceiveICMP},
{"UDP", udp.NewProtocol(), testReceiveUDP},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
TransportProtocols: []stack.TransportProtocol{test.protocolFactory},
})
e := channel.New(10, 1280, linkAddr1)
if err := s.CreateNIC(1, e); err != nil {
t.Fatalf("CreateNIC(_) = %s", err)
}
// Should receive a packet destined to the all-nodes
// multicast address.
test.rxf(t, s, e, addr1, header.IPv6AllNodesMulticastAddress, 1)
})
}
}
// TestReceiveOnSolicitedNodeAddr tests that IPv6 endpoints receive ICMP and UDP
// packets destined to the IPv6 solicited-node address of an assigned IPv6
// address.
func TestReceiveOnSolicitedNodeAddr(t *testing.T) {
tests := []struct {
name string
protocolFactory stack.TransportProtocol
rxf func(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64)
}{
{"ICMP", icmp.NewProtocol6(), testReceiveICMP},
{"UDP", udp.NewProtocol(), testReceiveUDP},
}
snmc := header.SolicitedNodeAddr(addr2)
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
TransportProtocols: []stack.TransportProtocol{test.protocolFactory},
})
e := channel.New(10, 1280, linkAddr1)
if err := s.CreateNIC(1, e); err != nil {
t.Fatalf("CreateNIC(_) = %s", err)
}
// Should not receive a packet destined to the solicited
// node address of addr2/addr3 yet as we haven't added
// those addresses.
test.rxf(t, s, e, addr1, snmc, 0)
if err := s.AddAddress(1, ProtocolNumber, addr2); err != nil {
t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, addr2, err)
}
// Should receive a packet destined to the solicited
// node address of addr2/addr3 now that we have added
// added addr2.
test.rxf(t, s, e, addr1, snmc, 1)
if err := s.AddAddress(1, ProtocolNumber, addr3); err != nil {
t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, addr3, err)
}
// Should still receive a packet destined to the
// solicited node address of addr2/addr3 now that we
// have added addr3.
test.rxf(t, s, e, addr1, snmc, 2)
if err := s.RemoveAddress(1, addr2); err != nil {
t.Fatalf("RemoveAddress(_, %s) = %s", addr2, err)
}
// Should still receive a packet destined to the
// solicited node address of addr2/addr3 now that we
// have removed addr2.
test.rxf(t, s, e, addr1, snmc, 3)
if err := s.RemoveAddress(1, addr3); err != nil {
t.Fatalf("RemoveAddress(_, %s) = %s", addr3, err)
}
// Should not receive a packet destined to the solicited
// node address of addr2/addr3 yet as both of them got
// removed.
test.rxf(t, s, e, addr1, snmc, 3)
})
}
}
// TestAddIpv6Address tests adding IPv6 addresses.
func TestAddIpv6Address(t *testing.T) {
tests := []struct {
name string
addr tcpip.Address
}{
// This test is in response to b/140943433.
{
"Nil",
tcpip.Address([]byte(nil)),
},
{
"ValidUnicast",
addr1,
},
{
"ValidLinkLocalUnicast",
lladdr0,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
})
if err := s.CreateNIC(1, &stubLinkEndpoint{}); err != nil {
t.Fatalf("CreateNIC(_) = %s", err)
}
if err := s.AddAddress(1, ProtocolNumber, test.addr); err != nil {
t.Fatalf("AddAddress(_, %d, nil) = %s", ProtocolNumber, err)
}
addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber)
if err != nil {
t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err)
}
if addr.Address != test.addr {
t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", addr.Address, test.addr)
}
})
}
}
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