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-rw-r--r--test/packetimpact/tests/BUILD13
-rw-r--r--test/packetimpact/tests/ipv4_fragment_reassembly_test.go142
-rw-r--r--test/packetimpact/tests/ipv6_fragment_reassembly_test.go237
3 files changed, 265 insertions, 127 deletions
diff --git a/test/packetimpact/tests/BUILD b/test/packetimpact/tests/BUILD
index 8c2de5a9f..c30c77a17 100644
--- a/test/packetimpact/tests/BUILD
+++ b/test/packetimpact/tests/BUILD
@@ -298,6 +298,18 @@ packetimpact_testbench(
)
packetimpact_testbench(
+ name = "ipv4_fragment_reassembly",
+ srcs = ["ipv4_fragment_reassembly_test.go"],
+ deps = [
+ "//pkg/tcpip/buffer",
+ "//pkg/tcpip/header",
+ "//test/packetimpact/testbench",
+ "@com_github_google_go_cmp//cmp:go_default_library",
+ "@org_golang_x_sys//unix:go_default_library",
+ ],
+)
+
+packetimpact_testbench(
name = "ipv6_fragment_reassembly",
srcs = ["ipv6_fragment_reassembly_test.go"],
deps = [
@@ -305,6 +317,7 @@ packetimpact_testbench(
"//pkg/tcpip/buffer",
"//pkg/tcpip/header",
"//test/packetimpact/testbench",
+ "@com_github_google_go_cmp//cmp:go_default_library",
"@org_golang_x_sys//unix:go_default_library",
],
)
diff --git a/test/packetimpact/tests/ipv4_fragment_reassembly_test.go b/test/packetimpact/tests/ipv4_fragment_reassembly_test.go
new file mode 100644
index 000000000..65c0df140
--- /dev/null
+++ b/test/packetimpact/tests/ipv4_fragment_reassembly_test.go
@@ -0,0 +1,142 @@
+// Copyright 2020 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 ipv4_fragment_reassembly_test
+
+import (
+ "flag"
+ "math/rand"
+ "testing"
+ "time"
+
+ "github.com/google/go-cmp/cmp"
+ "gvisor.dev/gvisor/pkg/tcpip/buffer"
+ "gvisor.dev/gvisor/pkg/tcpip/header"
+ "gvisor.dev/gvisor/test/packetimpact/testbench"
+)
+
+func init() {
+ testbench.RegisterFlags(flag.CommandLine)
+}
+
+type fragmentInfo struct {
+ offset uint16
+ size uint16
+ more uint8
+}
+
+func TestIPv4FragmentReassembly(t *testing.T) {
+ const fragmentID = 42
+ icmpv4ProtoNum := uint8(header.ICMPv4ProtocolNumber)
+
+ tests := []struct {
+ description string
+ ipPayloadLen int
+ fragments []fragmentInfo
+ expectReply bool
+ }{
+ {
+ description: "basic reassembly",
+ ipPayloadLen: 2000,
+ fragments: []fragmentInfo{
+ {offset: 0, size: 1000, more: header.IPv4FlagMoreFragments},
+ {offset: 1000, size: 1000, more: 0},
+ },
+ expectReply: true,
+ },
+ {
+ description: "out of order fragments",
+ ipPayloadLen: 2000,
+ fragments: []fragmentInfo{
+ {offset: 1000, size: 1000, more: 0},
+ {offset: 0, size: 1000, more: header.IPv4FlagMoreFragments},
+ },
+ expectReply: true,
+ },
+ }
+
+ for _, test := range tests {
+ t.Run(test.description, func(t *testing.T) {
+ dut := testbench.NewDUT(t)
+ defer dut.TearDown()
+ conn := testbench.NewIPv4Conn(t, testbench.IPv4{}, testbench.IPv4{})
+ defer conn.Close(t)
+
+ data := make([]byte, test.ipPayloadLen)
+ icmp := header.ICMPv4(data[:header.ICMPv4MinimumSize])
+ icmp.SetType(header.ICMPv4Echo)
+ icmp.SetCode(header.ICMPv4UnusedCode)
+ icmp.SetChecksum(0)
+ icmp.SetSequence(0)
+ icmp.SetIdent(0)
+ originalPayload := data[header.ICMPv4MinimumSize:]
+ if _, err := rand.Read(originalPayload); err != nil {
+ t.Fatalf("rand.Read: %s", err)
+ }
+ cksum := header.ICMPv4Checksum(
+ icmp,
+ buffer.NewVectorisedView(len(originalPayload), []buffer.View{originalPayload}),
+ )
+ icmp.SetChecksum(cksum)
+
+ for _, fragment := range test.fragments {
+ conn.Send(t,
+ testbench.IPv4{
+ Protocol: &icmpv4ProtoNum,
+ FragmentOffset: testbench.Uint16(fragment.offset),
+ Flags: testbench.Uint8(fragment.more),
+ ID: testbench.Uint16(fragmentID),
+ },
+ &testbench.Payload{
+ Bytes: data[fragment.offset:][:fragment.size],
+ })
+ }
+
+ var bytesReceived int
+ reassembledPayload := make([]byte, test.ipPayloadLen)
+ for {
+ incomingFrame, err := conn.ExpectFrame(t, testbench.Layers{
+ &testbench.Ether{},
+ &testbench.IPv4{},
+ &testbench.ICMPv4{},
+ }, time.Second)
+ if err != nil {
+ // Either an unexpected frame was received, or none at all.
+ if bytesReceived < test.ipPayloadLen {
+ t.Fatalf("received %d bytes out of %d, then conn.ExpectFrame(_, _, time.Second) failed with %s", bytesReceived, test.ipPayloadLen, err)
+ }
+ break
+ }
+ if !test.expectReply {
+ t.Fatalf("unexpected reply received:\n%s", incomingFrame)
+ }
+ ipPayload, err := incomingFrame[2 /* ICMPv4 */].ToBytes()
+ if err != nil {
+ t.Fatalf("failed to parse ICMPv4 header: incomingPacket[2].ToBytes() = (_, %s)", err)
+ }
+ offset := *incomingFrame[1 /* IPv4 */].(*testbench.IPv4).FragmentOffset
+ if copied := copy(reassembledPayload[offset:], ipPayload); copied != len(ipPayload) {
+ t.Fatalf("wrong number of bytes copied into reassembledPayload: got = %d, want = %d", copied, len(ipPayload))
+ }
+ bytesReceived += len(ipPayload)
+ }
+
+ if test.expectReply {
+ if diff := cmp.Diff(originalPayload, reassembledPayload[header.ICMPv4MinimumSize:]); diff != "" {
+ t.Fatalf("reassembledPayload mismatch (-want +got):\n%s", diff)
+ }
+ }
+ })
+ }
+}
diff --git a/test/packetimpact/tests/ipv6_fragment_reassembly_test.go b/test/packetimpact/tests/ipv6_fragment_reassembly_test.go
index a24c85566..4a29de688 100644
--- a/test/packetimpact/tests/ipv6_fragment_reassembly_test.go
+++ b/test/packetimpact/tests/ipv6_fragment_reassembly_test.go
@@ -15,154 +15,137 @@
package ipv6_fragment_reassembly_test
import (
- "bytes"
- "encoding/binary"
- "encoding/hex"
"flag"
+ "math/rand"
"net"
"testing"
"time"
+ "github.com/google/go-cmp/cmp"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/test/packetimpact/testbench"
)
-const (
- // The payload length for the first fragment we send. This number
- // is a multiple of 8 near 750 (half of 1500).
- firstPayloadLength = 752
- // The ID field for our outgoing fragments.
- fragmentID = 1
- // A node must be able to accept a fragmented packet that,
- // after reassembly, is as large as 1500 octets.
- reassemblyCap = 1500
-)
-
func init() {
testbench.RegisterFlags(flag.CommandLine)
}
-func TestIPv6FragmentReassembly(t *testing.T) {
- dut := testbench.NewDUT(t)
- defer dut.TearDown()
- conn := testbench.NewIPv6Conn(t, testbench.IPv6{}, testbench.IPv6{})
- defer conn.Close(t)
-
- firstPayloadToSend := make([]byte, firstPayloadLength)
- for i := range firstPayloadToSend {
- firstPayloadToSend[i] = 'A'
- }
-
- secondPayloadLength := reassemblyCap - firstPayloadLength - header.ICMPv6EchoMinimumSize
- secondPayloadToSend := firstPayloadToSend[:secondPayloadLength]
-
- icmpv6EchoPayload := make([]byte, 4)
- binary.BigEndian.PutUint16(icmpv6EchoPayload[0:], 0)
- binary.BigEndian.PutUint16(icmpv6EchoPayload[2:], 0)
- icmpv6EchoPayload = append(icmpv6EchoPayload, firstPayloadToSend...)
-
- lIP := tcpip.Address(net.ParseIP(testbench.LocalIPv6).To16())
- rIP := tcpip.Address(net.ParseIP(testbench.RemoteIPv6).To16())
- icmpv6 := testbench.ICMPv6{
- Type: testbench.ICMPv6Type(header.ICMPv6EchoRequest),
- Code: testbench.ICMPv6Code(header.ICMPv6UnusedCode),
- Payload: icmpv6EchoPayload,
- }
- icmpv6Bytes, err := icmpv6.ToBytes()
- if err != nil {
- t.Fatalf("failed to serialize ICMPv6: %s", err)
- }
- cksum := header.ICMPv6Checksum(
- header.ICMPv6(icmpv6Bytes),
- lIP,
- rIP,
- buffer.NewVectorisedView(len(secondPayloadToSend), []buffer.View{secondPayloadToSend}),
- )
-
- conn.Send(t, testbench.IPv6{},
- &testbench.IPv6FragmentExtHdr{
- FragmentOffset: testbench.Uint16(0),
- MoreFragments: testbench.Bool(true),
- Identification: testbench.Uint32(fragmentID),
- },
- &testbench.ICMPv6{
- Type: testbench.ICMPv6Type(header.ICMPv6EchoRequest),
- Code: testbench.ICMPv6Code(header.ICMPv6UnusedCode),
- Payload: icmpv6EchoPayload,
- Checksum: &cksum,
- })
+type fragmentInfo struct {
+ offset uint16
+ size uint16
+ more bool
+}
+func TestIPv6FragmentReassembly(t *testing.T) {
+ const fragmentID = 42
icmpv6ProtoNum := header.IPv6ExtensionHeaderIdentifier(header.ICMPv6ProtocolNumber)
- conn.Send(t, testbench.IPv6{},
- &testbench.IPv6FragmentExtHdr{
- NextHeader: &icmpv6ProtoNum,
- FragmentOffset: testbench.Uint16((firstPayloadLength + header.ICMPv6EchoMinimumSize) / 8),
- MoreFragments: testbench.Bool(false),
- Identification: testbench.Uint32(fragmentID),
+ tests := []struct {
+ description string
+ ipPayloadLen int
+ fragments []fragmentInfo
+ expectReply bool
+ }{
+ {
+ description: "basic reassembly",
+ ipPayloadLen: 1500,
+ fragments: []fragmentInfo{
+ {offset: 0, size: 760, more: true},
+ {offset: 760, size: 740, more: false},
+ },
+ expectReply: true,
},
- &testbench.Payload{
- Bytes: secondPayloadToSend,
- })
-
- gotEchoReplyFirstPart, err := conn.ExpectFrame(t, testbench.Layers{
- &testbench.Ether{},
- &testbench.IPv6{},
- &testbench.IPv6FragmentExtHdr{
- FragmentOffset: testbench.Uint16(0),
- MoreFragments: testbench.Bool(true),
+ {
+ description: "out of order fragments",
+ ipPayloadLen: 3000,
+ fragments: []fragmentInfo{
+ {offset: 0, size: 1024, more: true},
+ {offset: 2048, size: 952, more: false},
+ {offset: 1024, size: 1024, more: true},
+ },
+ expectReply: true,
},
- &testbench.ICMPv6{
- Type: testbench.ICMPv6Type(header.ICMPv6EchoReply),
- Code: testbench.ICMPv6Code(header.ICMPv6UnusedCode),
- },
- }, time.Second)
- if err != nil {
- t.Fatalf("expected a fragmented ICMPv6 Echo Reply, but got none: %s", err)
}
- id := *gotEchoReplyFirstPart[2].(*testbench.IPv6FragmentExtHdr).Identification
- gotFirstPayload, err := gotEchoReplyFirstPart[len(gotEchoReplyFirstPart)-1].ToBytes()
- if err != nil {
- t.Fatalf("failed to serialize ICMPv6: %s", err)
- }
- icmpPayload := gotFirstPayload[header.ICMPv6EchoMinimumSize:]
- receivedLen := len(icmpPayload)
- wantSecondPayloadLen := reassemblyCap - header.ICMPv6EchoMinimumSize - receivedLen
- wantFirstPayload := make([]byte, receivedLen)
- for i := range wantFirstPayload {
- wantFirstPayload[i] = 'A'
- }
- wantSecondPayload := wantFirstPayload[:wantSecondPayloadLen]
- if !bytes.Equal(icmpPayload, wantFirstPayload) {
- t.Fatalf("received unexpected payload, got: %s, want: %s",
- hex.Dump(icmpPayload),
- hex.Dump(wantFirstPayload))
- }
-
- gotEchoReplySecondPart, err := conn.ExpectFrame(t, testbench.Layers{
- &testbench.Ether{},
- &testbench.IPv6{},
- &testbench.IPv6FragmentExtHdr{
- NextHeader: &icmpv6ProtoNum,
- FragmentOffset: testbench.Uint16(uint16((receivedLen + header.ICMPv6EchoMinimumSize) / 8)),
- MoreFragments: testbench.Bool(false),
- Identification: &id,
- },
- &testbench.ICMPv6{},
- }, time.Second)
- if err != nil {
- t.Fatalf("expected the rest of ICMPv6 Echo Reply, but got none: %s", err)
- }
- secondPayload, err := gotEchoReplySecondPart[len(gotEchoReplySecondPart)-1].ToBytes()
- if err != nil {
- t.Fatalf("failed to serialize ICMPv6 Echo Reply: %s", err)
- }
- if !bytes.Equal(secondPayload, wantSecondPayload) {
- t.Fatalf("received unexpected payload, got: %s, want: %s",
- hex.Dump(secondPayload),
- hex.Dump(wantSecondPayload))
+ for _, test := range tests {
+ t.Run(test.description, func(t *testing.T) {
+ dut := testbench.NewDUT(t)
+ defer dut.TearDown()
+ conn := testbench.NewIPv6Conn(t, testbench.IPv6{}, testbench.IPv6{})
+ defer conn.Close(t)
+
+ lIP := tcpip.Address(net.ParseIP(testbench.LocalIPv6).To16())
+ rIP := tcpip.Address(net.ParseIP(testbench.RemoteIPv6).To16())
+
+ data := make([]byte, test.ipPayloadLen)
+ icmp := header.ICMPv6(data[:header.ICMPv6HeaderSize])
+ icmp.SetType(header.ICMPv6EchoRequest)
+ icmp.SetCode(header.ICMPv6UnusedCode)
+ icmp.SetChecksum(0)
+ originalPayload := data[header.ICMPv6HeaderSize:]
+ if _, err := rand.Read(originalPayload); err != nil {
+ t.Fatalf("rand.Read: %s", err)
+ }
+
+ cksum := header.ICMPv6Checksum(
+ icmp,
+ lIP,
+ rIP,
+ buffer.NewVectorisedView(len(originalPayload), []buffer.View{originalPayload}),
+ )
+ icmp.SetChecksum(cksum)
+
+ for _, fragment := range test.fragments {
+ conn.Send(t, testbench.IPv6{},
+ &testbench.IPv6FragmentExtHdr{
+ NextHeader: &icmpv6ProtoNum,
+ FragmentOffset: testbench.Uint16(fragment.offset / header.IPv6FragmentExtHdrFragmentOffsetBytesPerUnit),
+ MoreFragments: testbench.Bool(fragment.more),
+ Identification: testbench.Uint32(fragmentID),
+ },
+ &testbench.Payload{
+ Bytes: data[fragment.offset:][:fragment.size],
+ })
+ }
+
+ var bytesReceived int
+ reassembledPayload := make([]byte, test.ipPayloadLen)
+ for {
+ incomingFrame, err := conn.ExpectFrame(t, testbench.Layers{
+ &testbench.Ether{},
+ &testbench.IPv6{},
+ &testbench.IPv6FragmentExtHdr{},
+ &testbench.ICMPv6{},
+ }, time.Second)
+ if err != nil {
+ // Either an unexpected frame was received, or none at all.
+ if bytesReceived < test.ipPayloadLen {
+ t.Fatalf("received %d bytes out of %d, then conn.ExpectFrame(_, _, time.Second) failed with %s", bytesReceived, test.ipPayloadLen, err)
+ }
+ break
+ }
+ if !test.expectReply {
+ t.Fatalf("unexpected reply received:\n%s", incomingFrame)
+ }
+ ipPayload, err := incomingFrame[3 /* ICMPv6 */].ToBytes()
+ if err != nil {
+ t.Fatalf("failed to parse ICMPv6 header: incomingPacket[3].ToBytes() = (_, %s)", err)
+ }
+ offset := *incomingFrame[2 /* IPv6FragmentExtHdr */].(*testbench.IPv6FragmentExtHdr).FragmentOffset
+ offset *= header.IPv6FragmentExtHdrFragmentOffsetBytesPerUnit
+ if copied := copy(reassembledPayload[offset:], ipPayload); copied != len(ipPayload) {
+ t.Fatalf("wrong number of bytes copied into reassembledPayload: got = %d, want = %d", copied, len(ipPayload))
+ }
+ bytesReceived += len(ipPayload)
+ }
+
+ if test.expectReply {
+ if diff := cmp.Diff(originalPayload, reassembledPayload[header.ICMPv6HeaderSize:]); diff != "" {
+ t.Fatalf("reassembledPayload mismatch (-want +got):\n%s", diff)
+ }
+ }
+ })
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 14:23:49 +0000