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-rw-r--r--pkg/tcpip/network/ipv6/icmp.go12
-rw-r--r--pkg/tcpip/network/ipv6/icmp_test.go532
2 files changed, 543 insertions, 1 deletions
diff --git a/pkg/tcpip/network/ipv6/icmp.go b/pkg/tcpip/network/ipv6/icmp.go
index b289e902f..c3f1dd488 100644
--- a/pkg/tcpip/network/ipv6/icmp.go
+++ b/pkg/tcpip/network/ipv6/icmp.go
@@ -72,6 +72,18 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, vv buffer.V
h := header.ICMPv6(v)
iph := header.IPv6(netHeader)
+ // Validate ICMPv6 checksum before processing the packet.
+ //
+ // Only the first view in vv is accounted for by h. To account for the
+ // rest of vv, a shallow copy is made and the first view is removed.
+ // This copy is used as extra payload during the checksum calculation.
+ payload := vv
+ payload.RemoveFirst()
+ if got, want := h.Checksum(), header.ICMPv6Checksum(h, iph.SourceAddress(), iph.DestinationAddress(), payload); got != want {
+ received.Invalid.Increment()
+ return
+ }
+
// As per RFC 4861 sections 4.1 - 4.5, 6.1.1, 6.1.2, 7.1.1, 7.1.2 and
// 8.1, nodes MUST silently drop NDP packets where the Hop Limit field
// in the IPv6 header is not set to 255.
diff --git a/pkg/tcpip/network/ipv6/icmp_test.go b/pkg/tcpip/network/ipv6/icmp_test.go
index 7c11dde55..b112303b6 100644
--- a/pkg/tcpip/network/ipv6/icmp_test.go
+++ b/pkg/tcpip/network/ipv6/icmp_test.go
@@ -30,7 +30,7 @@ import (
)
const (
- linkAddr0 = tcpip.LinkAddress("\x01\x02\x03\x04\x05\x06")
+ linkAddr0 = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x06")
linkAddr1 = tcpip.LinkAddress("\x0a\x0b\x0c\x0d\x0e\x0f")
)
@@ -359,3 +359,533 @@ func TestLinkResolution(t *testing.T) {
routeICMPv6Packet(t, args, nil)
}
}
+
+func TestICMPChecksumValidationSimple(t *testing.T) {
+ types := []struct {
+ name string
+ typ header.ICMPv6Type
+ size int
+ statCounter func(tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter
+ }{
+ {
+ "DstUnreachable",
+ header.ICMPv6DstUnreachable,
+ header.ICMPv6DstUnreachableMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.DstUnreachable
+ },
+ },
+ {
+ "PacketTooBig",
+ header.ICMPv6PacketTooBig,
+ header.ICMPv6PacketTooBigMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.PacketTooBig
+ },
+ },
+ {
+ "TimeExceeded",
+ header.ICMPv6TimeExceeded,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.TimeExceeded
+ },
+ },
+ {
+ "ParamProblem",
+ header.ICMPv6ParamProblem,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.ParamProblem
+ },
+ },
+ {
+ "EchoRequest",
+ header.ICMPv6EchoRequest,
+ header.ICMPv6EchoMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.EchoRequest
+ },
+ },
+ {
+ "EchoReply",
+ header.ICMPv6EchoReply,
+ header.ICMPv6EchoMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.EchoReply
+ },
+ },
+ {
+ "RouterSolicit",
+ header.ICMPv6RouterSolicit,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.RouterSolicit
+ },
+ },
+ {
+ "RouterAdvert",
+ header.ICMPv6RouterAdvert,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.RouterAdvert
+ },
+ },
+ {
+ "NeighborSolicit",
+ header.ICMPv6NeighborSolicit,
+ header.ICMPv6NeighborSolicitMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.NeighborSolicit
+ },
+ },
+ {
+ "NeighborAdvert",
+ header.ICMPv6NeighborAdvert,
+ header.ICMPv6NeighborAdvertSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.NeighborAdvert
+ },
+ },
+ {
+ "RedirectMsg",
+ header.ICMPv6RedirectMsg,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.RedirectMsg
+ },
+ },
+ }
+
+ for _, typ := range types {
+ t.Run(typ.name, func(t *testing.T) {
+ e := channel.New(10, 1280, linkAddr0)
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
+ })
+ if err := s.CreateNIC(1, e); err != nil {
+ t.Fatalf("CreateNIC(_) = %s", err)
+ }
+
+ if err := s.AddAddress(1, ProtocolNumber, lladdr0); err != nil {
+ t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, lladdr0, err)
+ }
+ {
+ subnet, err := tcpip.NewSubnet(lladdr1, tcpip.AddressMask(strings.Repeat("\xff", len(lladdr1))))
+ if err != nil {
+ t.Fatal(err)
+ }
+ s.SetRouteTable(
+ []tcpip.Route{{
+ Destination: subnet,
+ NIC: 1,
+ }},
+ )
+ }
+
+ handleIPv6Payload := func(typ header.ICMPv6Type, size int, checksum bool) {
+ hdr := buffer.NewPrependable(header.IPv6MinimumSize + size)
+ pkt := header.ICMPv6(hdr.Prepend(size))
+ pkt.SetType(typ)
+ if checksum {
+ pkt.SetChecksum(header.ICMPv6Checksum(pkt, lladdr1, lladdr0, buffer.VectorisedView{}))
+ }
+ ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
+ ip.Encode(&header.IPv6Fields{
+ PayloadLength: uint16(size),
+ NextHeader: uint8(header.ICMPv6ProtocolNumber),
+ HopLimit: header.NDPHopLimit,
+ SrcAddr: lladdr1,
+ DstAddr: lladdr0,
+ })
+ e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
+ }
+
+ stats := s.Stats().ICMP.V6PacketsReceived
+ invalid := stats.Invalid
+ typStat := typ.statCounter(stats)
+
+ // Initial stat counts should be 0.
+ if got := invalid.Value(); got != 0 {
+ t.Fatalf("got invalid = %d, want = 0", got)
+ }
+ if got := typStat.Value(); got != 0 {
+ t.Fatalf("got %s = %d, want = 0", typ.name, got)
+ }
+
+ // Without setting checksum, the incoming packet should
+ // be invalid.
+ handleIPv6Payload(typ.typ, typ.size, false)
+ if got := invalid.Value(); got != 1 {
+ t.Fatalf("got invalid = %d, want = 1", got)
+ }
+ // Rx count of type typ.typ should not have increased.
+ if got := typStat.Value(); got != 0 {
+ t.Fatalf("got %s = %d, want = 0", typ.name, got)
+ }
+
+ // When checksum is set, it should be received.
+ handleIPv6Payload(typ.typ, typ.size, true)
+ if got := typStat.Value(); got != 1 {
+ t.Fatalf("got %s = %d, want = 1", typ.name, got)
+ }
+ // Invalid count should not have increased again.
+ if got := invalid.Value(); got != 1 {
+ t.Fatalf("got invalid = %d, want = 1", got)
+ }
+ })
+ }
+}
+
+func TestICMPChecksumValidationWithPayload(t *testing.T) {
+ const simpleBodySize = 64
+ simpleBody := func(view buffer.View) {
+ for i := 0; i < simpleBodySize; i++ {
+ view[i] = uint8(i)
+ }
+ }
+
+ const errorICMPBodySize = header.IPv6MinimumSize + simpleBodySize
+ errorICMPBody := func(view buffer.View) {
+ ip := header.IPv6(view)
+ ip.Encode(&header.IPv6Fields{
+ PayloadLength: simpleBodySize,
+ NextHeader: 10,
+ HopLimit: 20,
+ SrcAddr: lladdr0,
+ DstAddr: lladdr1,
+ })
+ simpleBody(view[header.IPv6MinimumSize:])
+ }
+
+ types := []struct {
+ name string
+ typ header.ICMPv6Type
+ size int
+ statCounter func(tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter
+ payloadSize int
+ payload func(buffer.View)
+ }{
+ {
+ "DstUnreachable",
+ header.ICMPv6DstUnreachable,
+ header.ICMPv6DstUnreachableMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.DstUnreachable
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "PacketTooBig",
+ header.ICMPv6PacketTooBig,
+ header.ICMPv6PacketTooBigMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.PacketTooBig
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "TimeExceeded",
+ header.ICMPv6TimeExceeded,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.TimeExceeded
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "ParamProblem",
+ header.ICMPv6ParamProblem,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.ParamProblem
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "EchoRequest",
+ header.ICMPv6EchoRequest,
+ header.ICMPv6EchoMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.EchoRequest
+ },
+ simpleBodySize,
+ simpleBody,
+ },
+ {
+ "EchoReply",
+ header.ICMPv6EchoReply,
+ header.ICMPv6EchoMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.EchoReply
+ },
+ simpleBodySize,
+ simpleBody,
+ },
+ }
+
+ for _, typ := range types {
+ t.Run(typ.name, func(t *testing.T) {
+ e := channel.New(10, 1280, linkAddr0)
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
+ })
+ if err := s.CreateNIC(1, e); err != nil {
+ t.Fatalf("CreateNIC(_) = %s", err)
+ }
+
+ if err := s.AddAddress(1, ProtocolNumber, lladdr0); err != nil {
+ t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, lladdr0, err)
+ }
+ {
+ subnet, err := tcpip.NewSubnet(lladdr1, tcpip.AddressMask(strings.Repeat("\xff", len(lladdr1))))
+ if err != nil {
+ t.Fatal(err)
+ }
+ s.SetRouteTable(
+ []tcpip.Route{{
+ Destination: subnet,
+ NIC: 1,
+ }},
+ )
+ }
+
+ handleIPv6Payload := func(typ header.ICMPv6Type, size, payloadSize int, payloadFn func(buffer.View), checksum bool) {
+ icmpSize := size + payloadSize
+ hdr := buffer.NewPrependable(header.IPv6MinimumSize + icmpSize)
+ pkt := header.ICMPv6(hdr.Prepend(icmpSize))
+ pkt.SetType(typ)
+ payloadFn(pkt.Payload())
+
+ if checksum {
+ pkt.SetChecksum(header.ICMPv6Checksum(pkt, lladdr1, lladdr0, buffer.VectorisedView{}))
+ }
+
+ ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
+ ip.Encode(&header.IPv6Fields{
+ PayloadLength: uint16(icmpSize),
+ NextHeader: uint8(header.ICMPv6ProtocolNumber),
+ HopLimit: header.NDPHopLimit,
+ SrcAddr: lladdr1,
+ DstAddr: lladdr0,
+ })
+ e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
+ }
+
+ stats := s.Stats().ICMP.V6PacketsReceived
+ invalid := stats.Invalid
+ typStat := typ.statCounter(stats)
+
+ // Initial stat counts should be 0.
+ if got := invalid.Value(); got != 0 {
+ t.Fatalf("got invalid = %d, want = 0", got)
+ }
+ if got := typStat.Value(); got != 0 {
+ t.Fatalf("got %s = %d, want = 0", typ.name, got)
+ }
+
+ // Without setting checksum, the incoming packet should
+ // be invalid.
+ handleIPv6Payload(typ.typ, typ.size, typ.payloadSize, typ.payload, false)
+ if got := invalid.Value(); got != 1 {
+ t.Fatalf("got invalid = %d, want = 1", got)
+ }
+ // Rx count of type typ.typ should not have increased.
+ if got := typStat.Value(); got != 0 {
+ t.Fatalf("got %s = %d, want = 0", typ.name, got)
+ }
+
+ // When checksum is set, it should be received.
+ handleIPv6Payload(typ.typ, typ.size, typ.payloadSize, typ.payload, true)
+ if got := typStat.Value(); got != 1 {
+ t.Fatalf("got %s = %d, want = 1", typ.name, got)
+ }
+ // Invalid count should not have increased again.
+ if got := invalid.Value(); got != 1 {
+ t.Fatalf("got invalid = %d, want = 1", got)
+ }
+ })
+ }
+}
+
+func TestICMPChecksumValidationWithPayloadMultipleViews(t *testing.T) {
+ const simpleBodySize = 64
+ simpleBody := func(view buffer.View) {
+ for i := 0; i < simpleBodySize; i++ {
+ view[i] = uint8(i)
+ }
+ }
+
+ const errorICMPBodySize = header.IPv6MinimumSize + simpleBodySize
+ errorICMPBody := func(view buffer.View) {
+ ip := header.IPv6(view)
+ ip.Encode(&header.IPv6Fields{
+ PayloadLength: simpleBodySize,
+ NextHeader: 10,
+ HopLimit: 20,
+ SrcAddr: lladdr0,
+ DstAddr: lladdr1,
+ })
+ simpleBody(view[header.IPv6MinimumSize:])
+ }
+
+ types := []struct {
+ name string
+ typ header.ICMPv6Type
+ size int
+ statCounter func(tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter
+ payloadSize int
+ payload func(buffer.View)
+ }{
+ {
+ "DstUnreachable",
+ header.ICMPv6DstUnreachable,
+ header.ICMPv6DstUnreachableMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.DstUnreachable
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "PacketTooBig",
+ header.ICMPv6PacketTooBig,
+ header.ICMPv6PacketTooBigMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.PacketTooBig
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "TimeExceeded",
+ header.ICMPv6TimeExceeded,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.TimeExceeded
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "ParamProblem",
+ header.ICMPv6ParamProblem,
+ header.ICMPv6MinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.ParamProblem
+ },
+ errorICMPBodySize,
+ errorICMPBody,
+ },
+ {
+ "EchoRequest",
+ header.ICMPv6EchoRequest,
+ header.ICMPv6EchoMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.EchoRequest
+ },
+ simpleBodySize,
+ simpleBody,
+ },
+ {
+ "EchoReply",
+ header.ICMPv6EchoReply,
+ header.ICMPv6EchoMinimumSize,
+ func(stats tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter {
+ return stats.EchoReply
+ },
+ simpleBodySize,
+ simpleBody,
+ },
+ }
+
+ for _, typ := range types {
+ t.Run(typ.name, func(t *testing.T) {
+ e := channel.New(10, 1280, linkAddr0)
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
+ })
+ if err := s.CreateNIC(1, e); err != nil {
+ t.Fatalf("CreateNIC(_) = %s", err)
+ }
+
+ if err := s.AddAddress(1, ProtocolNumber, lladdr0); err != nil {
+ t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, lladdr0, err)
+ }
+ {
+ subnet, err := tcpip.NewSubnet(lladdr1, tcpip.AddressMask(strings.Repeat("\xff", len(lladdr1))))
+ if err != nil {
+ t.Fatal(err)
+ }
+ s.SetRouteTable(
+ []tcpip.Route{{
+ Destination: subnet,
+ NIC: 1,
+ }},
+ )
+ }
+
+ handleIPv6Payload := func(typ header.ICMPv6Type, size, payloadSize int, payloadFn func(buffer.View), checksum bool) {
+ hdr := buffer.NewPrependable(header.IPv6MinimumSize + size)
+ pkt := header.ICMPv6(hdr.Prepend(size))
+ pkt.SetType(typ)
+
+ payload := buffer.NewView(payloadSize)
+ payloadFn(payload)
+
+ if checksum {
+ pkt.SetChecksum(header.ICMPv6Checksum(pkt, lladdr1, lladdr0, payload.ToVectorisedView()))
+ }
+
+ ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
+ ip.Encode(&header.IPv6Fields{
+ PayloadLength: uint16(size + payloadSize),
+ NextHeader: uint8(header.ICMPv6ProtocolNumber),
+ HopLimit: header.NDPHopLimit,
+ SrcAddr: lladdr1,
+ DstAddr: lladdr0,
+ })
+ e.Inject(ProtocolNumber,
+ buffer.NewVectorisedView(header.IPv6MinimumSize+size+payloadSize,
+ []buffer.View{hdr.View(), payload}))
+ }
+
+ stats := s.Stats().ICMP.V6PacketsReceived
+ invalid := stats.Invalid
+ typStat := typ.statCounter(stats)
+
+ // Initial stat counts should be 0.
+ if got := invalid.Value(); got != 0 {
+ t.Fatalf("got invalid = %d, want = 0", got)
+ }
+ if got := typStat.Value(); got != 0 {
+ t.Fatalf("got %s = %d, want = 0", typ.name, got)
+ }
+
+ // Without setting checksum, the incoming packet should
+ // be invalid.
+ handleIPv6Payload(typ.typ, typ.size, typ.payloadSize, typ.payload, false)
+ if got := invalid.Value(); got != 1 {
+ t.Fatalf("got invalid = %d, want = 1", got)
+ }
+ // Rx count of type typ.typ should not have increased.
+ if got := typStat.Value(); got != 0 {
+ t.Fatalf("got %s = %d, want = 0", typ.name, got)
+ }
+
+ // When checksum is set, it should be received.
+ handleIPv6Payload(typ.typ, typ.size, typ.payloadSize, typ.payload, true)
+ if got := typStat.Value(); got != 1 {
+ t.Fatalf("got %s = %d, want = 1", typ.name, got)
+ }
+ // Invalid count should not have increased again.
+ if got := invalid.Value(); got != 1 {
+ t.Fatalf("got invalid = %d, want = 1", got)
+ }
+ })
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 19:32:33 +0000