netdev - Re: [PATCH V2] ipv6: Fix problem with expired dst cache

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Date:	Wed, 29 Feb 2012 17:26:07 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org, eric.dumazet@...il.com,
	Gao feng <gaofeng@...fujitsu.com>
Subject: Re: [PATCH V2] ipv6: Fix problem with expired dst cache

Hi David.

于 2012年02月27日 14:36, Gao feng 写道:
> 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.
> 

I will send the v3 PATCH.
This version has some changes.
1,hold the ort in ip6_rt_copy and release it in ip6_dst_destroy just as Eric said.
2,add some functions to operate the RTF_EXPIRES flag and expires(from).
3,change the code to use the functions added in 2.
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