netdev - [RFC][PATCH 3/3]ipv6:fix the outgoing interface selection order in udpv6

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Date:	Tue, 09 Dec 2008 15:12:59 +0800
From:	Yang Hongyang <yanghy@...fujitsu.com>
To:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: [RFC][PATCH 3/3]ipv6:fix the outgoing interface selection order in
 udpv6_sendmsg()

1.When no interface is specified in an IPV6_PKTINFO ancillary data
  item, the interface specified in an IPV6_PKTINFO sticky optionis 
  is used.

RFC3542:
6.7.  Summary of Outgoing Interface Selection

   This document and [RFC-3493] specify various methods that affect the
   selection of the packet's outgoing interface.  This subsection
   summarizes the ordering among those in order to ensure deterministic
   behavior.

   For a given outgoing packet on a given socket, the outgoing interface
   is determined in the following order:

   1. if an interface is specified in an IPV6_PKTINFO ancillary data
      item, the interface is used.

   2. otherwise, if an interface is specified in an IPV6_PKTINFO sticky
      option, the interface is used.

Signed-off-by: Yang Hongyang<yanghy@...fujitsu.com>
---
 net/ipv6/udp.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8b48512..addd856 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -761,6 +761,9 @@ do_udp_sendmsg:
 	}

 	if (!fl.oif)
+		fl.oif = np->sticky_pktinfo.ipi6_ifindex;
+
+	if (!fl.oif)
 		fl.oif = sk->sk_bound_dev_if;

 	if (msg->msg_controllen) {
-- 
1.6.0.1
--
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