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

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@gmail.com>
Acked-by: Eric Dumazet <redacted>
Cc: Patrick McHardy <redacted>

@Eric: could you please confirm that you ack'ed this patch? I don't find
the email with your explicit ack.