diff options
author | Kevin Cernekee <cernekee@gmail.com> | 2012-12-17 22:33:58 +0400 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-01-18 00:12:44 +0400 |
commit | 7266507d89991fa1e989283e4e032c6d9357fe26 (patch) | |
tree | aca858b5ac98c695d8b636a9d27549a3af37e016 /include/net/netns/conntrack.h | |
parent | 247fa82be1301e4f89eaa5dc10be62a9cc84e8c5 (diff) | |
download | linux-7266507d89991fa1e989283e4e032c6d9357fe26.tar.xz |
netfilter: nf_ct_sip: support Cisco 7941/7945 IP phones
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 <eric.dumazet@gmail.com>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/net/netns/conntrack.h')
0 files changed, 0 insertions, 0 deletions