linux-kernel - Re: [PATCH v4 net] ipvs: fix bind to link-local mcast IPv6 address in backup

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Date:	Thu, 23 Jun 2016 10:27:58 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Julian Anastasov <ja@....bg>
Cc:	Quentin Armitage <quentin@...itage.org.uk>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lvs-devel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 net] ipvs: fix bind to link-local mcast IPv6 address
 in backup

On Fri, Jun 17, 2016 at 09:42:49AM +0300, Julian Anastasov wrote:
> 
> 	Hello,
> 
> On Thu, 16 Jun 2016, Quentin Armitage wrote:
> 
> > When using HEAD from
> > https://git.kernel.org/cgit/utils/kernel/ipvsadm/ipvsadm.git/,
> > the command:
> > ipvsadm --start-daemon backup --mcast-interface eth0.60 \
> >     --mcast-group ff02::1:81
> > fails with the error message:
> > Argument list too long
> > 
> > whereas both:
> > ipvsadm --start-daemon master --mcast-interface eth0.60 \
> >     --mcast-group ff02::1:81
> > and:
> > ipvsadm --start-daemon backup --mcast-interface eth0.60 \
> >     --mcast-group 224.0.0.81
> > are successful.
> > 
> > The error message "Argument list too long" isn't helpful. The error occurs
> > because an IPv6 address is given in backup mode.
> > 
> > The error is in make_receive_sock() in net/netfilter/ipvs/ip_vs_sync.c,
> > since it fails to set the interface on the address or the socket before
> > calling inet6_bind() (via sock->ops->bind), where the test
> > 'if (!sk->sk_bound_dev_if)' failed.
> > 
> > Setting sock->sk->sk_bound_dev_if on the socket before calling
> > inet6_bind() resolves the issue.
> > 
> > Fixes: d33288172e72 ("ipvs: add more mcast parameters for the sync daemon")
> > Signed-off-by: Quentin Armitage <quentin@...itage.org.uk>
> 
> 	Looks good to me, thanks!
> 
> Acked-by: Julian Anastasov <ja@....bg>
> 
> 	Simon, please apply to ipvs tree. Patch compiles
> also on stable 4.4.13, 4.5.7 and 4.6.2, so no need for
> special versions. The ack is also for the other 3 patches
> from v4 (for ipvs-next) but they depend on this patch.

Thanks, done.