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unix: add ParseOrigDstAddr

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Add a function which turns a SocketControlMessage into a Sockaddr.
This can be used with IP(V6)_RECVORIGDSTADDR to retrieve the original
destination address of a packet.

Change-Id: Ib2d80cd01be6642e8b918cbc1584d4a49c3c6f1e
Reviewed-on: https://go-review.googlesource.com/c/sys/+/355609
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Lorenz Bauer
2021-10-25 11:29:17 +00:00
committed by Tobias Klauser
parent d6a326fbbf
commit 711f33c999
2 changed files with 130 additions and 0 deletions
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unix/sockcmsg_linux.go
+31
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@@ -56,3 +56,34 @@ func PktInfo6(info *Inet6Pktinfo) []byte {
*(*Inet6Pktinfo)(h.data(0)) = *info
return b
}
// ParseOrigDstAddr decodes a socket control message containing the original
// destination address. To receive such a message the IP_RECVORIGDSTADDR or
// IPV6_RECVORIGDSTADDR option must be enabled on the socket.
func ParseOrigDstAddr(m *SocketControlMessage) (Sockaddr, error) {
switch {
case m.Header.Level == SOL_IP && m.Header.Type == IP_ORIGDSTADDR:
pp := (*RawSockaddrInet4)(unsafe.Pointer(&m.Data[0]))
sa := new(SockaddrInet4)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, nil
case m.Header.Level == SOL_IPV6 && m.Header.Type == IPV6_ORIGDSTADDR:
pp := (*RawSockaddrInet6)(unsafe.Pointer(&m.Data[0]))
sa := new(SockaddrInet6)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
sa.ZoneId = pp.Scope_id
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, nil
default:
return nil, EINVAL
}
}