netdev - Re: [PATCH] Fix bug of update IPv4 PMTU when received ICMP Fragmentation Needed message

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Message-ID: <20070604025528.GA27750@gondor.apana.org.au>
Date:	Mon, 4 Jun 2007 12:55:28 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Wei Yongjun <yjwei@...fujitsu.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] Fix bug of update IPv4 PMTU when received ICMP Fragmentation Needed message

On Mon, Jun 04, 2007 at 08:39:21AM +0800, Wei Yongjun wrote:
>
> >Huh? The test new_mtu >= old_mtu should only hold if the sending router
> >is buggy which is what the hack is for.
>
> Note here old_mtu is not the real old mtu, is the received message's size:
>  unsigned short old_mtu = ntohs(iph->tot_len);
> So maybe the patch would like following.

The size of the packet that caused the ICMP is what we want here.  That's
why the router must be buggy.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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