linux-kernel - Re: [PATCH 3.4 19/19] ipv6: reallocate addrconf router for ipv6 address when lo device up

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Date:	Wed, 6 Aug 2014 16:03:12 +0800
From:	chenweilong <chenweilong@...wei.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>
CC:	<stable@...r.kernel.org>, Sabrina Dubroca <sd@...asysnail.net>,
	"Hannes Frederic Sowa" <hannes@...essinduktion.org>,
	Gao feng <gaofeng@...fujitsu.com>,
	"David S. Miller" <davem@...emloft.net>,
	Li Zefan <lizefan@...wei.com>
Subject: Re: [PATCH 3.4 19/19] ipv6: reallocate addrconf router for ipv6 address
 when lo device up

Hi,

This patch get a compile warn.
I'll resend one.

Thanks

On 2014/8/6 2:29, Greg Kroah-Hartman wrote:
> 3.4-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Gao feng <gaofeng@...fujitsu.com>
> 
> commit 33d99113b1102c2d2f8603b9ba72d89d915c13f5 upstream.
> 
> commit 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f
> "net IPv6 : Fix broken IPv6 routing table after loopback down-up"
> allocates addrconf router for ipv6 address when lo device up.
> but commit a881ae1f625c599b460cc8f8a7fcb1c438f699ad
> "ipv6:don't call addrconf_dst_alloc again when enable lo" breaks
> this behavior.
> 
> Since the addrconf router is moved to the garbage list when
> lo device down, we should release this router and rellocate
> a new one for ipv6 address when lo device up.
> 
> This patch solves bug 67951 on bugzilla
> https://bugzilla.kernel.org/show_bug.cgi?id=67951
> 
> change from v1:
> use ip6_rt_put to repleace ip6_del_rt, thanks Hannes!
> change code style, suggested by Sergei.
> 
> CC: Sabrina Dubroca <sd@...asysnail.net>
> CC: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Reported-by: Weilong Chen <chenweilong@...wei.com>
> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> [weilong: s/ip6_rt_put/dst_release]
> Signed-off-by: Chen Weilong <chenweilong@...wei.com>
> Signed-off-by: Li Zefan <lizefan@...wei.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> ---
>  net/ipv6/addrconf.c |   14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -2438,8 +2438,18 @@ static void init_loopback(struct net_dev
>  			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
>  				continue;
>  
> -			if (sp_ifa->rt)
> -				continue;
> +			if (sp_ifa->rt) {
> +				/* This dst has been added to garbage list when
> +				 * lo device down, release this obsolete dst and
> +				 * reallocate a new router for ifa.
> +				 */
> +				if (sp_ifa->rt->dst.obsolete > 0) {
> +					dst_release(sp_ifa->rt);
> +					sp_ifa->rt = NULL;
> +				} else {
> +					continue;
> +				}
> +			}
>  
>  			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
>  
> 
> 
> 
> .
> 

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