Commit 33d99113 authored by Gao feng's avatar Gao feng Committed by David S. Miller

ipv6: reallocate addrconf router for ipv6 address when lo device up

commit 25fb6ca4
"net IPv6 : Fix broken IPv6 routing table after loopback down-up"
allocates addrconf router for ipv6 address when lo device up.
but commit a881ae1f
"ipv6:don't call addrconf_dst_alloc again when enable lo" breaks
this behavior.

Since the addrconf router is moved to the garbage list when
lo device down, we should release this router and rellocate
a new one for ipv6 address when lo device up.

This patch solves bug 67951 on bugzilla
https://bugzilla.kernel.org/show_bug.cgi?id=67951

change from v1:
use ip6_rt_put to repleace ip6_del_rt, thanks Hannes!
change code style, suggested by Sergei.

CC: Sabrina Dubroca <sd@queasysnail.net>
CC: Hannes Frederic Sowa <hannes@stressinduktion.org>
Reported-by: default avatarWeilong Chen <chenweilong@huawei.com>
Signed-off-by: default avatarWeilong Chen <chenweilong@huawei.com>
Signed-off-by: default avatarGao feng <gaofeng@cn.fujitsu.com>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a0065f26
......@@ -2657,8 +2657,18 @@ static void init_loopback(struct net_device *dev)
if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
continue;
if (sp_ifa->rt)
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) {
ip6_rt_put(sp_ifa->rt);
sp_ifa->rt = NULL;
} else {
continue;
}
}
sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
......
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