Commit 1cdda918 authored Jan 29, 2016 by Paolo Abeni Committed by David S. Miller Jan 29, 2016

ipv6/udp: use sticky pktinfo egress ifindex on connect()



Currently, the egress interface index specified via IPV6_PKTINFO
is ignored by __ip6_datagram_connect(), so that RFC 3542 section 6.7
can be subverted when the user space application calls connect()
before sendmsg().
Fix it by initializing properly flowi6_oif in connect() before
performing the route lookup.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 6f21c96a

net/ipv6/datagram.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -162,6 +162,9 @@ ipv4_connected:
		fl6.fl6_dport = inet->inet_dport;
		fl6.fl6_sport = inet->inet_sport;

		if (!fl6.flowi6_oif)
		fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;

		if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
		fl6.flowi6_oif = np->mcast_oif;

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