netdev - Re: [PATCH] net: ipv6 bind to device issue

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Date:	Tue, 20 Apr 2010 14:13:39 -0400
From:	Brian Haley <brian.haley@...com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	davem@...emloft.net, kuznet@....inr.ac.ru, pekkas@...core.fi,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: ipv6 bind to device issue

Jiri Olsa wrote:
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index c2438e8..7bf7717 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -815,7 +815,7 @@ struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
>  {
>  	int flags = 0;
>  
> -	if (rt6_need_strict(&fl->fl6_dst))
> +	if (rt6_need_strict(&fl->fl6_dst) || fl->oif)
>  		flags |= RT6_LOOKUP_F_IFACE;
>  
>  	if (!ipv6_addr_any(&fl->fl6_src))

Actually, looking at this again, we might want to swap the order
here since fl->oif should be filled-in for most link-local and
multicast requests calling this:

	if (fl->oif || rt6_need_strict(&fl->fl6_dst))

Just a thought, but it potentially saves a call to determine
the scope of the address.

-Brian
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