netdev - Re: [PATCH v3 resend] netfilter: nf_conntrack_sip: Handle Cisco 7941/7945 IP phones

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Message-ID: <1306432664.2543.2.camel@edumazet-laptop>
Date:	Thu, 26 May 2011 19:57:44 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	Kevin Cernekee <cernekee@...il.com>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v3 resend] netfilter: nf_conntrack_sip: Handle Cisco
 7941/7945 IP phones

Le jeudi 26 mai 2011 à 18:50 +0200, Pablo Neira Ayuso a écrit :
> Hi Eric,
> 
> On 20/05/11 06:36, Kevin Cernekee wrote:
> > Most SIP devices use a source port of 5060/udp on SIP requests, so the
> > response automatically comes back to port 5060:
> > 
> > phone_ip:5060 -> proxy_ip:5060   REGISTER
> > proxy_ip:5060 -> phone_ip:5060   100 Trying
> > 
> > The newer Cisco IP phones, however, use a randomly chosen high source
> > port for the SIP request but expect the response on port 5060:
> > 
> > phone_ip:49173 -> proxy_ip:5060  REGISTER
> > proxy_ip:5060 -> phone_ip:5060   100 Trying
> > 
> > Standard Linux NAT, with or without nf_nat_sip, will send the reply back
> > to port 49173, not 5060:
> > 
> > phone_ip:49173 -> proxy_ip:5060  REGISTER
> > proxy_ip:5060 -> phone_ip:49173  100 Trying
> > 
> > But the phone is not listening on 49173, so it will never see the reply.
> > 
> > This patch modifies nf_*_sip to work around this quirk by extracting
> > the SIP response port from the Via: header, iff the source IP in the
> > packet header matches the source IP in the SIP request.
> > 
> > Signed-off-by: Kevin Cernekee <cernekee@...il.com>
> > Acked-by: Eric Dumazet <eric.dumazet@...il.com>
> > Cc: Patrick McHardy <kaber@...sh.net>
> 
> @Eric: could you please confirm that you ack'ed this patch? I don't find
> the email with your explicit ack.

Yes I did it ;)

http://www.spinics.net/lists/netfilter/msg49632.html

Thanks !


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