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ipv6: fix the outgoing interface selection order in udpv6_sendmsg()

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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@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yang Hongyang 2008-12-16 02:08:29 -08:00 committed by David S. Miller
parent f250dcdac1
commit 9f690db7ff
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/udp.c
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@ -793,6 +793,9 @@ do_udp_sendmsg:
if (!fl.oif)
fl.oif = sk->sk_bound_dev_if;
if (!fl.oif)
fl.oif = np->sticky_pktinfo.ipi6_ifindex;
if (msg->msg_controllen) {
opt = &opt_space;
memset(opt, 0, sizeof(struct ipv6_txoptions));