Subject: [PATCH 3.4-stable] ipv6: reallocate addrconf router for ipv6 address when lo, device up

From: chenweilong <[email-masked]>
Date: Tue, 17 Jun 2014 18:23:59 +0800

Hi Greg,

Please queue this for 3.4 stable kernel.

It fix the bug 67951 on bugzilla
https://bugzilla.kernel.org/show_bug.cgi?id=67951

The patch can't be applied directly, as it' used the function introduced
by "commit 94e187c0" ip6_rt_put(), that patch can't be applied directly
either. So I had to write this one.

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

From: Gao feng <[email-masked]>

commit 33d99113b1102c2d2f8603b9ba72d89d915c13f5 upstream.

This commit don't have a stable tag, but it fix the bug
no reply after loopback down-up.It's very worthy to be
applied to stable 3.4 kernels.

The bug is 67951 on bugzilla
https://bugzilla.kernel.org/show_bug.cgi?id=67951

CC: Sabrina Dubroca <[email-masked]>
CC: Hannes Frederic Sowa <[email-masked]>
Reported-by: Weilong Chen <[email-masked]>
Signed-off-by: Weilong Chen <[email-masked]>
Signed-off-by: Gao feng <[email-masked]>
Acked-by: Hannes Frederic Sowa <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
[weilong: s/ip6_rt_put/dst_release]
Signed-off-by: Chen Weilong <[email-masked]>
Signed-off-by: Li Zefan <[email-masked]>
---
 net/ipv6/addrconf.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index abfa007..25399bf 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2435,8 +2435,18 @@ static void init_loopback(struct net_device *dev)
 			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
 				continue;

-			if (sp_ifa->rt)
-				continue;
+			if (sp_ifa->rt) {
+				/* This dst has been added to garbage list when
+				 * lo device down, release this obsolete dst and
+				 * reallocate a new router for ifa.
+				 */
+				if (sp_ifa->rt->dst.obsolete > 0) {
+					dst_release(sp_ifa->rt);
+					sp_ifa->rt = NULL;
+				} else {
+					continue;
+				}
+			}

 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);

-- 1.7.12