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

于 2012年02月24日 14:51, Eric Dumazet 写道:

Le vendredi 24 février 2012 à 14:20 +0800, Gao feng a écrit :

quoted

if the ipv6 dst cache copy from the dst witch generated by ICMPV6 RA packet.
this dst cache will not be checked expire because it has no RTF_EXPIRES flag
So this dst cache always be used until the dst gc run.

add a pointer in struct rt6_info,point to where the dst cache copy from.
in func rt6_check_expired check if rt6->info->rt6i_copy is expired.

Sorry, I really dont understand what you are saying.

Just because ipv6 dst cache has no RTF_EXPIRES flag,
so even this dst cache has expired,it will be used until the gc run.

Also, adding a pointer to a structure without holding a reference on it
is suspicious.

OK,I think there is no use to hold a reference.
the dst cache will be deleted before the pointer,
So this pointer will be always usefull.