netdev - Re: [PATCH v5] ipv6: Fix problem with expired dst cache

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Message-ID: <4F6682AF.6020307@cn.fujitsu.com>
Date:	Mon, 19 Mar 2012 08:49:51 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH v5] ipv6: Fix problem with expired dst cache

于 2012年03月17日 13:33, David Miller 写道:
> From: Gao feng <gaofeng@...fujitsu.com>
> Date: Mon, 5 Mar 2012 15:16:02 +0800
> 
>> If the ipv6 dst cache which copy from the dst generated by ICMPV6 RA packet.
>> this dst cache will not check expire because it has no RTF_EXPIRES flag.
>> So this dst cache will always be used until the dst gc run.
>>
>> Change the struct dst_entry,add a union contains new pointer from and expires.
>> When rt6_info.rt6i_flags has no RTF_EXPIRES flag,the dst.expires has no use.
>> we can use this field to point to where the dst cache copy from.
>> The dst.from is only used in IPV6.
>>
>> In func rt6_check_expired check if rt6_info.dst.from is expired.
>>
>> In func ip6_rt_copy only set dst.from when the ort has flag RTF_ADDRCONF
>> and RTF_DEFAULT.then hold the ort.
>>
>> In func ip6_dst_destroy release the ort.
>>
>> Add some functions to operate the RTF_EXPIRES flag and expires(from) together.
>> and change the code to use these new adding functions.
>>
>> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
> 
> I see some unprotected access to dst.expires in the router discovery
> code in net/ipv6/ndisc.c, doesn't that need to be updated?
> 
> There are probably some more similar cases elsewhere in the ipv6 code
> too.
> 

Hi David

I only search the RTF_EXPIRES flag and forget the expires.I will do this.

BUT what confuse me is that, in func ip6_rt_copy should we do rt6_set_from in any case
or only when the ort has flag RTF_ADDRCONF and RTF_DEFAULT?

thanks.
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