linux-kernel - [PATCH 3.12 009/116] ipv6/udp: use sticky pktinfo egress ifindex on connect()

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Message-Id: <22d310aa03b6009f252c1c53fe2adb5b0919f330.1457082108.git.jslaby@suse.cz>
Date:	Fri,  4 Mar 2016 10:00:54 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 009/116] ipv6/udp: use sticky pktinfo egress ifindex on connect()

From: Paolo Abeni <pabeni@...hat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ 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@...hat.com>
Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/ipv6/datagram.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index e24fa8c01dd2..fcfa2885df0e 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -163,6 +163,9 @@ 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;
 
-- 
2.7.2