netdev - Re: [PATCH] ipip, sit: fix ipv4_{update

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Message-Id: <20140607213635.490493e5846e3c81704de67d@qrator.net>
Date:	Sat, 7 Jun 2014 21:36:35 +0400
From:	Dmitry Popov <ixaphire@...tor.net>
To:	Dmitry Popov <ixaphire@...tor.net>
Cc:	Dmitry Kozlov <xeb@...l.ru>, Cong Wang <cwang@...pensource.com>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	trivial@...nel.org
Subject: Re: [PATCH] ipip, sit: fix ipv4_{update_pmtu,redirect} calls

On Sat, 7 Jun 2014 19:54:12 +0400
Dmitry Popov <ixaphire@...tor.net> wrote:

> 3) gre:
> ipgre is a framework for subprotos which doesn't work with tunnel devices by
> itself (see net/ipv4/gre_demux.c:gre_cisco_err). Although it uses 
> skb->dev->ifindex for ipv4_{update_pmtu,redirect} which might be wrong for hosts
> with asymmetric routing, this is not a big deal, because tunnels bound to device 
> will not work with asymmetric routing anyway. So I think it is okay.

Actually, yes, it may not work in case of unbound tunnel and asymmetric routing,
but we'll need to put icmp redirects/frag_needed handling inside 
gre_cisco_protocol->err_handler then, I am not sure if it's worth it.
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