netdev - Re: [PATCH net] ipv6: refresh rt6i_genid in ip6_pol

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Message-ID: <1410149905.11872.73.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 07 Sep 2014 21:18:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	nicolas.dichtel@...nd.com, therbert@...gle.com,
	alexander.h.duyck@...el.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] ipv6: refresh rt6i_genid in ip6_pol_route()

On Sun, 2014-09-07 at 15:54 -0700, David Miller wrote:

> This might be broken.
> 
> We are dealing here with persistent entries in the ipv6 routine trie.
> 
> If you just bump the genid on the next person to look it up, other
> sockets and cached entities might not have validated the route yet,
> and now will falsely see the route as valid.  We have to ensure that
> they too drop this route and perform a relookup.

I am confused, I thought it was the role of the cookie.

(Ie socket has to store its own cookie to be able to validate a route)

Before 6f3118b571b8 patch, how was this done anyway ?

If persistent routes cannot refresh the genid, then they are useless ?



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