From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net/ipv6/route.c: packets originating on device match
 lo
Date: Mon, 25 Jun 2012 16:28:32 -0700 (PDT)
Message-ID: <20120625.162832.804773711822642700.davem@davemloft.net>
References: <20120625065030.GA28914@mcafee.com>
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From: David McCullough <david_mccullough@mcafee.com>
Date: Mon, 25 Jun 2012 16:50:30 +1000

> @@ -931,6 +931,9 @@ struct dst_entry * ip6_route_output(stru
>  {
>  	int flags = 0;
>  
> +	if (fl6->flowi6_iif == 0)
> +		fl6->flowi6_iif = net->loopback_dev->ifindex;
> +		

Like ipv4, you should make this assignment unconditionally.

Thanks.