From patchwork Tue Dec 9 07:12:59 2008 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [RFC, 3/3] ipv6:fix the outgoing interface selection order in udpv6_sendmsg() Date: Mon, 08 Dec 2008 21:12:59 -0000 From: Yang Hongyang X-Patchwork-Id: 12899 Message-Id: <493E1A7B.9070208@cn.fujitsu.com> To: netdev@vger.kernel.org, "David S. Miller" 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 --- 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) {