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Kevin Cernekee 7266507d89 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>
2013-01-17 21:12:44 +01:00
..
9p virtio: 9p: correctly pass physical address to userspace for high pages 2012-10-22 18:19:36 +10:30
802
8021q ethtool: fix drvinfo strings set in drivers 2013-01-06 21:06:31 -08:00
appletalk
atm atm: use scnprintf() instead of sprintf() 2012-12-17 20:50:51 -08:00
ax25
batman-adv batman-adv: unbloat batadv_priv if debug is not enabled 2013-01-12 20:58:23 +10:00
bluetooth Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2012-12-13 12:00:48 -08:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-01-15 15:05:59 -05:00
caif caif_usb: Make the driver name check more efficient 2012-12-09 00:34:02 -05:00
can Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2013-01-02 17:32:49 -08:00
core Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-01-15 15:05:59 -05:00
dcb net: Allow DCBnl to use other namespaces besides init_net 2012-12-10 14:09:01 -05:00
dccp inet: Fix kmemleak in tcp_v4/6_syn_recv_sock and dccp_v4/6_request_recv_sock 2012-12-14 13:14:07 -05:00
decnet net: Push capable(CAP_NET_ADMIN) into the rtnl methods 2012-11-18 20:32:44 -05:00
dns_resolver Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2012-12-16 15:40:50 -08:00
dsa net: phy: remove flags argument from phy_{attach, connect, connect_direct} 2013-01-14 15:11:50 -05:00
ethernet net: remove unnecessary NET_ADDR_RANDOM "bitclean" 2013-01-03 22:37:36 -08:00
ieee802154 6lowpan: consider checksum bytes in fragmentation threshold 2012-11-30 12:19:24 -05:00
ipv4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-01-15 15:05:59 -05:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-01-15 15:05:59 -05:00
ipx
irda TTY/Serial merge for 3.8-rc1 2012-12-11 14:08:47 -08:00
iucv s390/irq: remove split irq fields from /proc/stat 2013-01-08 10:57:07 +01:00
key net: Allow userns root to control llc, netfilter, netlink, packet, and xfrm 2012-11-18 20:32:45 -05:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-11-10 18:32:51 -05:00
lapb
llc net: Allow userns root to control llc, netfilter, netlink, packet, and xfrm 2012-11-18 20:32:45 -05:00
mac80211 mac80211: fix maximum MTU 2013-01-03 13:00:01 +01:00
mac802154 mac802154: fix NOHZ local_softirq_pending 08 warning 2013-01-04 13:47:21 -08:00
netfilter netfilter: nf_ct_sip: support Cisco 7941/7945 IP phones 2013-01-17 21:12:44 +01:00
netlabel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-10-02 13:38:27 -07:00
netlink netlink: Use FIELD_SIZEOF() in netlink_proto_init(). 2013-01-09 23:38:23 -08:00
netrom
nfc nfc: remove noisy message from llcp_sock_sendmsg 2012-12-13 12:58:10 -05:00
openvswitch openvswitch: Use FIELD_SIZEOF() in dp_init(). 2013-01-09 23:38:24 -08:00
packet net: Allow userns root to control llc, netfilter, netlink, packet, and xfrm 2012-11-18 20:32:45 -05:00
phonet net: Push capable(CAP_NET_ADMIN) into the rtnl methods 2012-11-18 20:32:44 -05:00
rds IB/rds: suppress incompatible protocol when version is known 2012-12-26 15:17:37 -08:00
rfkill Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
rose
rxrpc rxrpc: Use FIELD_SIZEOF() in af_rxrpc_init(). 2013-01-09 23:38:24 -08:00
sched pkt_sched: namespace aware act_mirred 2013-01-14 15:09:36 -05:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-01-15 15:05:59 -05:00
sunrpc NFS client bugfixe for Linux 3.8 2013-01-11 12:09:04 -08:00
tipc tipc: refactor accept() code for improved readability 2012-12-07 17:23:24 -05:00
unix unix: Use FIELD_SIZEOF() in af_unix_init(). 2013-01-09 23:38:24 -08:00
wanrouter
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-01-15 15:05:59 -05:00
x25
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2012-11-22 15:25:55 -05:00
compat.c
Kconfig net: Add support for XPS without sysfs being defined 2013-01-10 22:47:04 -08:00
Makefile ipv6: Preserve ipv6 functionality needed by NET 2012-11-18 02:34:00 -05:00
nonet.c
socket.c cgroup: net_cls: Rework update socket logic 2012-10-26 03:40:51 -04:00
sysctl_net.c user_ns: get rid of duplicate code in net_ctl_permissions 2012-11-18 20:32:45 -05:00