netdev - Re: [PATCH net-next] ipv6: bump genid when delete/add address

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Date:	Thu, 01 Aug 2013 16:34:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fan.du@...driver.com
Cc:	yoshfuji@...ux-ipv6.org, jmorris@...ei.org,
	hannes@...essinduktion.org, vyasevich@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv6: bump genid when delete/add address

From: Fan Du <fan.du@...driver.com>
Date: Thu, 1 Aug 2013 17:44:44 +0800

>      Server           Client
> 2001:1::803/64  <-> 2001:1::805/64
> 2001:2::804/64  <-> 2001:2::806/64
> 
> Server side fib binary tree looks like this:
> 
>                                    (2001:/64)
>                                    /
>                                   /
>                    ffff88002103c380
>                  /                 \
>      (2)        /                   \
>  (2001::803/128)                     ffff880037ac07c0
>                                     /               \
>                                    /                 \  (3)
>                       ffff880037ac0640               (2001::806/128)
>                        /             \
>              (1)      /               \
>         (2001::804/128)               (2001::805/128)
> 
> Delete 2001::804/64 won't cause prefix route deleted as well as rt in (3)
> destinate to 2001::806 with source address as 2001::804/64. That's because
> 2001::803/64 is still alive, which make onlink=1 in ipv6_del_addr, this is
> where the substantial difference between same prefix configuration and
> different prefix configuration :) So packet are still transmitted out to
> 2001::806 with source address as 2001::804/64.
> 
> So bump genid will clear rt in (3), and up layer protocol will eventually
> find the right one for themselves.
> 
> This problem arised from the discussion in here:
> http://marc.info/?l=linux-netdev&m=137404469219410&w=4
> 
> Signed-off-by: Fan Du <fan.du@...driver.com>

Applied, thanks.
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