This patch-set is an initial approach at implementing the new SIP Alg,
mentioned by Aaron at [1].
I'm mostly interested in getting to know your thoughts of how this is
headed. There are a couple of points that are worth bringing up:
- As mentioned in patches 1/3 and 2/3, this is still a preliminary
implementation, and some work will be needed to move away from some
assuptions, like assuming the SIP traffic is always going over IPv4
and TCP;
- At the moment, the sip state is being stored in the conn struct. I
followed the example of seq_skew_dir here, which is also stored there,
but realise this is not ideal. It seems storing it somewhere agnostic
will be ideal in the future, to avoid polluting that struct with
different Alg's details;
- The SIP helpers functions and structures are in conntrack-sip.h and
conntrack-sip.c. This can create confusion when comparing to
conntrack-tcp.c and other protocols since SIP is an Alg and is at a
different level.
With regards to testing, for now, this has been tested manually, by
setting up the flows mentioned in patch 2/3 and having two VMs connected
to OvS, both using SIPp to simulate real traffic both ways. I'm going to
have a look at how this can be automated and added to
tests/system-traffic.at, together with the rest of the already existing
tests.
[1] [CONNTRACK] Discussions at OvS 2017:
https://mail.openvswitch.org/pipermail/ovs-dev/2017-November/341089.html
Tiago Lam (3):
Conntrack: Add new API for future SIP Alg.
Conntrack: Add initial support for new SIP Alg.
Conntrack: Support asymmetric RTP port for SIP.
include/openvswitch/ofp-actions.h | 4 +
lib/automake.mk | 2 +
lib/conntrack-private.h | 2 +
lib/conntrack-sip.c | 491 ++++++++++++++++++++++++++++++++++++++
lib/conntrack-sip.h | 123 ++++++++++
lib/conntrack.c | 254 +++++++++++++++++++-
lib/ofp-parse.c | 5 +
ofproto/ofproto-dpif-xlate.c | 3 +
8 files changed, 883 insertions(+), 1 deletion(-)
create mode 100644 lib/conntrack-sip.c
create mode 100644 lib/conntrack-sip.h
--
2.14.3
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