netdev - XFRM and IPv6 raw sockets and multicast

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Message-ID: <9c46321e0712040727tee578cm97a83936fefb34ed@mail.gmail.com>
Date:	Tue, 4 Dec 2007 16:27:50 +0100
From:	"Hugo Santos" <hugosantos@...il.com>
To:	netdev@...r.kernel.org
Subject: XFRM and IPv6 raw sockets and multicast

Hi,

  I've ran into an issue which i'm not sure that is known. I'm able to
provide a patch if people feel this is something that should be fixed.

  Anyway, the source address of packets is not taken into account when
matching for xfrm policies when socket(AF_INET6, SOCK_RAW,
IPPROTO_RAW) sockets are used. This doesn't allow for (S,G) policies
to be deployed for IPv6 for local output packets as is required for
some multicast communications (read: SSM).

  The behavior is the same as in UDP, but ipv6_pinfo->saddr is not
usually set for these kind of sockets. I would say that if fl6_src is
any, it should be copied from the ipv6 header.

  Another question is why does raw.c require a msg_name? If
inet->hdrincl was set, it could use the ipv6 header destination
address in the absense of msg_name.

  Any comments? :-)

  Thanks,
    Hugo
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