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21741e111b
So we can generate IPv6 ping replies. Change-Id: I79a9a38d8aa242e5dfca4cd15dfaffaea6cb1aee Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package packet
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import (
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"testing"
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"inet.af/netaddr"
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"tailscale.com/types/ipproto"
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)
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func TestICMPv6PingResponse(t *testing.T) {
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pingHdr := ICMP6Header{
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IP6Header: IP6Header{
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Src: netaddr.MustParseIP("1::1"),
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Dst: netaddr.MustParseIP("2::2"),
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IPProto: ipproto.ICMPv6,
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},
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Type: ICMP6EchoRequest,
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Code: ICMP6NoCode,
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}
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// echoReqLen is 2 bytes identifier + 2 bytes seq number.
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// https://datatracker.ietf.org/doc/html/rfc4443#section-4.1
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// Packet.IsEchoRequest verifies that these 4 bytes are present.
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const echoReqLen = 4
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buf := make([]byte, pingHdr.Len()+echoReqLen)
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if err := pingHdr.Marshal(buf); err != nil {
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t.Fatal(err)
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}
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var p Parsed
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p.Decode(buf)
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if !p.IsEchoRequest() {
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t.Fatalf("not an echo request, got: %+v", p)
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}
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pingHdr.ToResponse()
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buf = make([]byte, pingHdr.Len()+echoReqLen)
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if err := pingHdr.Marshal(buf); err != nil {
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t.Fatal(err)
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}
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p.Decode(buf)
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if p.IsEchoRequest() {
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t.Fatalf("unexpectedly still an echo request: %+v", p)
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}
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if !p.IsEchoResponse() {
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t.Fatalf("not an echo response: %+v", p)
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}
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}
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func TestICMPv6Checksum(t *testing.T) {
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const req = "\x60\x0f\x07\x00\x00\x10\x3a\x40\xfd\x7a\x11\x5c\xa1\xe0\xab\x12" +
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"\x48\x43\xcd\x96\x62\x7b\x65\x28\x26\x07\xf8\xb0\x40\x0a\x08\x07" +
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"\x00\x00\x00\x00\x00\x00\x20\x0e\x80\x00\x4a\x9a\x2e\xea\x00\x02" +
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"\x61\xb1\x9e\xad\x00\x06\x45\xaa"
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// The packet that we'd originally generated incorrectly, but with the checksum
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// bytes fixed per WireShark's correct calculation:
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const wantRes = "\x60\x00\xf8\xff\x00\x10\x3a\x40\x26\x07\xf8\xb0\x40\x0a\x08\x07" +
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"\x00\x00\x00\x00\x00\x00\x20\x0e\xfd\x7a\x11\x5c\xa1\xe0\xab\x12" +
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"\x48\x43\xcd\x96\x62\x7b\x65\x28\x81\x00\x49\x9a\x2e\xea\x00\x02" +
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"\x61\xb1\x9e\xad\x00\x06\x45\xaa"
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var p Parsed
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p.Decode([]byte(req))
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if !p.IsEchoRequest() {
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t.Fatalf("not an echo request, got: %+v", p)
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}
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h := p.ICMP6Header()
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h.ToResponse()
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pong := Generate(&h, p.Payload())
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if string(pong) != wantRes {
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t.Errorf("wrong packet\n\n got: %x\nwant: %x", pong, wantRes)
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}
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}
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