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net/packet: add ICMP6Header, like ICMP4Header

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So we can generate IPv6 ping replies.

Change-Id: I79a9a38d8aa242e5dfca4cd15dfaffaea6cb1aee
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-12-08 22:05:07 -08:00
committed by Brad Fitzpatrick
parent 7b9c7bc42b
commit 21741e111b
4 changed files with 226 additions and 7 deletions
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net/packet/packet.go
+9 -7
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@@ -75,7 +75,7 @@ func (p *Parsed) String() string {
}
// Decode extracts data from the packet in b into q.
// It performs extremely simple packet decoding for basic IPv4 packet types.
// It performs extremely simple packet decoding for basic IPv4 and IPv6 packet types.
// It extracts only the subprotocol id, IP addresses, and (if any) ports,
// and shouldn't need any memory allocation.
func (q *Parsed) Decode(b []byte) {
@@ -339,9 +339,6 @@ func (q *Parsed) IP6Header() IP6Header {
}
func (q *Parsed) ICMP4Header() ICMP4Header {
if q.IPVersion != 4 {
panic("IP4Header called on non-IPv4 Parsed")
}
return ICMP4Header{
IP4Header: q.IP4Header(),
Type: ICMP4Type(q.b[q.subofs+0]),
@@ -349,10 +346,15 @@ func (q *Parsed) ICMP4Header() ICMP4Header {
}
}
func (q *Parsed) UDP4Header() UDP4Header {
if q.IPVersion != 4 {
panic("IP4Header called on non-IPv4 Parsed")
func (q *Parsed) ICMP6Header() ICMP6Header {
return ICMP6Header{
IP6Header: q.IP6Header(),
Type: ICMP6Type(q.b[q.subofs+0]),
Code: ICMP6Code(q.b[q.subofs+1]),
}
}
func (q *Parsed) UDP4Header() UDP4Header {
return UDP4Header{
IP4Header: q.IP4Header(),
SrcPort: q.Src.Port(),