netdev - Re: [PATCH net-2.6.22-rc7] xfrm beet interfamily support

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Message-ID: <469CE793.7020903@trash.net>
Date:	Tue, 17 Jul 2007 18:00:19 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	joakim.koskela@...t.fi
CC:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-2.6.22-rc7] xfrm beet interfamily support

Joakim Koskela wrote:
> On Monday 16 July 2007 21:47:40 Patrick McHardy wrote:
> 
>>>diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
>>>index 44ef208..8db7910 100644
>>>--- a/net/ipv4/xfrm4_output.c
>>>+++ b/net/ipv4/xfrm4_output.c
>>>@@ -53,7 +53,8 @@ static int xfrm4_output_one(struct sk_buff *skb)
>>> 			goto error_nolock;
>>> 	}
>>>
>>>-	if (x->props.mode == XFRM_MODE_TUNNEL) {
>>>+	if (x->props.mode == XFRM_MODE_TUNNEL ||
>>>+	    x->props.mode == XFRM_MODE_BEET) {
>>> 		err = xfrm4_tunnel_check_size(skb);
>>
>>Its not a real tunnel and all packets are generated locally, why
>>does it need to send ICMPs?
> 
> 
> Guess not. I'll have to still trace through, but can probably be removed.


Just FYI: it does make a difference with netfilter since packets
may be NATed to match a policy, but thats a more general problem
that also affects transport mode and should be dealt with within
netfilter, possibly by propagating PMTU values amonst dst_entries.

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