netdev - Re: [PATCH] ipv6: reallocate addrconf router for ipv6 address when lo device up

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Message-ID: <52E1BE7E.1080009@cn.fujitsu.com>
Date:	Fri, 24 Jan 2014 09:14:38 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	netdev@...r.kernel.org
CC:	davem@...emloft.net, Sabrina Dubroca <sd@...asysnail.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Weilong Chen <chenweilong@...wei.com>
Subject: Re: [PATCH] ipv6: reallocate addrconf router for ipv6 address when
 lo device up

On 01/24/2014 05:13 AM, Sergei Shtylyov wrote:
> Hello.
> 
> On 23-01-2014 10:57, Gao feng wrote:
> 
>> commit 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f
>> "net IPv6 : Fix broken IPv6 routing table after loopback down-up"
>> allocates addrconf router for ipv6 address when lo device up.
>> but commit a881ae1f625c599b460cc8f8a7fcb1c438f699ad
>> "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 delete 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
> 
>> CC: Sabrina Dubroca <sd@...asysnail.net>
>> CC: Hannes Frederic Sowa <hannes@...essinduktion.org>
>> Reported-by: Weilong Chen <chenweilong@...wei.com>
>> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
>> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
>> ---
>>   net/ipv6/addrconf.c | 13 +++++++++++--
>>   1 file changed, 11 insertions(+), 2 deletions(-)
> 
>> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
>> index 4b6b720..6eecd9d 100644
>> --- a/net/ipv6/addrconf.c
>> +++ b/net/ipv6/addrconf.c
>> @@ -2611,8 +2611,17 @@ 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, delete this obsolete dst and
>> +                 * reallocate a new router for ifa.
>> +                 */
>> +                if (sp_ifa->rt->dst.obsolete > 0) {
>> +                    ip6_del_rt(sp_ifa->rt);
>> +                    sp_ifa->rt = NULL;
>> +                } else
>> +                    continue;
> 
>    *else* arm should have {} when the other arm of *if* statement has it -- see Documentation/CodingStyle.
> 

Thanks!

will add in v2.


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