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

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[ Upstream commit 1cdda91871470f15e79375991bd2eddc6e86ddb1 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Abeni 2016-01-29 12:30:20 +01:00 committed by Greg Kroah-Hartman
parent e8e729ccd2
commit e1c4e14bf1
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/datagram.c
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@ -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;