Support IPv6 extension headers in packetimpact tests.

- IPv6 HopByHop Options Extension Header
- IPv6 Destination Options Extension Header

PiperOrigin-RevId: 318551425

1 files changed, 111 insertions, 0 deletions

diff --git a/test/packetimpact/testbench/layers_test.go b/test/packetimpact/testbench/layers_test.go
index c7f00e70d..382a983a1 100644
--- a/test/packetimpact/testbench/layers_test.go
+++ b/test/packetimpact/testbench/layers_test.go
@@ -505,3 +505,114 @@ func TestTCPOptions(t *testing.T) {
 		})
 	}
 }
+
+func TestIPv6ExtHdrOptions(t *testing.T) {
+	for _, tt := range []struct {
+		description string
+		wantBytes   []byte
+		wantLayers  Layers
+	}{
+		{
+			description: "IPv6/HopByHop",
+			wantBytes: []byte{
+				// IPv6 Header
+				0x60, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x40, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x01, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xde, 0xad, 0xbe, 0xef,
+				// HopByHop Options
+				0x3b, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00,
+			},
+			wantLayers: []Layer{
+				&IPv6{
+					SrcAddr: Address(tcpip.Address(net.ParseIP("::1"))),
+					DstAddr: Address(tcpip.Address(net.ParseIP("fe80::dead:beef"))),
+				},
+				&IPv6HopByHopOptionsExtHdr{
+					NextHeader: IPv6ExtHdrIdent(header.IPv6NoNextHeaderIdentifier),
+					Options:    []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00},
+				},
+				&Payload{
+					Bytes: nil,
+				},
+			},
+		},
+		{
+			description: "IPv6/HopByHop/Payload",
+			wantBytes: []byte{
+				// IPv6 Header
+				0x60, 0x00, 0x00, 0x00, 0x00, 0x13, 0x00, 0x40, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x01, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xde, 0xad, 0xbe, 0xef,
+				// HopByHop Options
+				0x3b, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00,
+				// Sample Data
+				0x53, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x20, 0x44, 0x61, 0x74, 0x61,
+			},
+			wantLayers: []Layer{
+				&IPv6{
+					SrcAddr: Address(tcpip.Address(net.ParseIP("::1"))),
+					DstAddr: Address(tcpip.Address(net.ParseIP("fe80::dead:beef"))),
+				},
+				&IPv6HopByHopOptionsExtHdr{
+					NextHeader: IPv6ExtHdrIdent(header.IPv6NoNextHeaderIdentifier),
+					Options:    []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00},
+				},
+				&Payload{
+					Bytes: []byte("Sample Data"),
+				},
+			},
+		},
+		{
+			description: "IPv6/HopByHop/Destination/ICMPv6",
+			wantBytes: []byte{
+				// IPv6 Header
+				0x60, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x40, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x01, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xde, 0xad, 0xbe, 0xef,
+				// HopByHop Options
+				0x3c, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00,
+				// Destination Options
+				0x3a, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00,
+				// ICMPv6 Param Problem
+				0x04, 0x00, 0x5f, 0x98, 0x00, 0x00, 0x00, 0x06,
+			},
+			wantLayers: []Layer{
+				&IPv6{
+					SrcAddr: Address(tcpip.Address(net.ParseIP("::1"))),
+					DstAddr: Address(tcpip.Address(net.ParseIP("fe80::dead:beef"))),
+				},
+				&IPv6HopByHopOptionsExtHdr{
+					NextHeader: IPv6ExtHdrIdent(header.IPv6DestinationOptionsExtHdrIdentifier),
+					Options:    []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00},
+				},
+				&IPv6DestinationOptionsExtHdr{
+					NextHeader: IPv6ExtHdrIdent(header.IPv6ExtensionHeaderIdentifier(header.ICMPv6ProtocolNumber)),
+					Options:    []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00},
+				},
+				&ICMPv6{
+					Type:       ICMPv6Type(header.ICMPv6ParamProblem),
+					Code:       Byte(0),
+					Checksum:   Uint16(0x5f98),
+					NDPPayload: []byte{0x00, 0x00, 0x00, 0x06},
+				},
+			},
+		},
+	} {
+		t.Run(tt.description, func(t *testing.T) {
+			layers := parse(parseIPv6, tt.wantBytes)
+			if !layers.match(tt.wantLayers) {
+				t.Fatalf("match failed with diff: %s", layers.diff(tt.wantLayers))
+			}
+			gotBytes, err := layers.ToBytes()
+			if err != nil {
+				t.Fatalf("ToBytes() failed on %s: %s", &layers, err)
+			}
+			if !bytes.Equal(tt.wantBytes, gotBytes) {
+				t.Fatalf("mismatching bytes, gotBytes: %x, wantBytes: %x", gotBytes, tt.wantBytes)
+			}
+		})
+	}
+}