ipv6:fix the return interface index when get it while no message is received

When get receiving interface index while no message is received, the the value seted with setsockopt() should be returned.

RFC 3542:
Issuing getsockopt() for the above options will return the sticky option value i.e., the value set with setsockopt(). If no sticky option value has been set getsockopt() will return the following values:

- For the IPV6_PKTINFO option, it will return an in6_pktinfo structure with ipi6_addr being in6addr_any and ipi6_ifindex being zero.

Signed-off-by Yang Hongyang<[email protected]>

---
 net/ipv6/ipv6_sockglue.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

net/ipv6/ipv6_sockglue.c +2 -2

index fc80401..4770bd9 100644
@@ -938,8 +938,8 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
 		} else {
 			if (np->rxopt.bits.rxinfo) {
 				struct in6_pktinfo src_info;
-				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif : sk->sk_bound_dev_if;
-				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
+				src_info.ipi6_ifindex = np->sticky_pktinfo.ipi6_ifindex;
+				ipv6_addr_copy(&src_info.ipi6_addr, &(np->sticky_pktinfo.ipi6_addr));
 				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 			}
 			if (np->rxopt.bits.rxhlim) {

Updated patch:

From: Yang Hongyang <[email protected]>
Date: Mon, 15 Dec 2008 17:05:54 +0800

Quoted 1 line

Updated patch:

Thanks Yang. I'm still reviewing this and deciding if I will apply the latest version of your patches.

Thanks in advance for your patience.

Updated patch:

When get receiving interface index while no message is received, the the value seted with setsockopt() should be returned.

Signed-off-by Yang Hongyang<[email protected]>