netdev - Re: [PATCH] ipv6: clear RTF_EXPIRES when call ip6_rt

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Date:	Tue, 17 Dec 2013 11:32:21 +0800
From:	RongQing Li <roy.qing.li@...il.com>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: clear RTF_EXPIRES when call ip6_rt_copy

If the ort->rt6i_flags is RTF_EXPIRES|RTF_ADDRCONF, then rt6_set_from will not
be called, and new created rt will have RTF_EXPIRES, but dst.expires is 0, and
dst.from is NULL

-Roy

2013/12/17 Gao feng <gaofeng@...fujitsu.com>:
> On 12/16/2013 04:31 PM, roy.qing.li@...il.com wrote:
>> From: Li RongQing <roy.qing.li@...il.com>
>>
>> The commit ecd9883724b [ipv6: fix race condition regarding dst->expires and
>> dst->from.] removed rt6_clean_expires in ip6_rt_copy, which causes the TAHI
>> test case v6LC.4.1.4 { Reduce PMTU On-link } failed, since the newly generated
>> rt maybe always expired {with RTF_EXPIRES flag, dst.expires is 0, and dst.from
>> is NULL}.
>>
>> Fix it by clearing RTF_EXPIRES as before 1716a96101[ipv6: fix problem with
>> expired dst cache]
>>
>> Signed-off-by: Li RongQing <roy.qing.li@...il.com>
>> ---
>>  net/ipv6/route.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
>> index a1a5752..e3d7f21 100644
>> --- a/net/ipv6/route.c
>> +++ b/net/ipv6/route.c
>> @@ -1908,7 +1908,7 @@ static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
>>                       rt->rt6i_gateway = ort->rt6i_gateway;
>>               else
>>                       rt->rt6i_gateway = *dest;
>> -             rt->rt6i_flags = ort->rt6i_flags;
>> +             rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
>>               if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
>>                   (RTF_DEFAULT | RTF_ADDRCONF))
>>                       rt6_set_from(rt, ort);
>>
>
> I don't understand, rt6_set_from already clears the RTF_EXPIRES from rt->rt6i_flags.
>
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