fenner 51fa6f0e6c Add the IP_RECVIF socket option, which supplies a packet's incoming interface
using a sockaddr_dl.

Fix the other packet-information socket options (SO_TIMESTAMP, IP_RECVDSTADDR)
to work for multicast UDP and raw sockets as well.  (They previously only
worked for unicast UDP).
1996-11-11 04:56:32 +00:00
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