match SIP & RTP packets

match SIP & RTP packets

[Lorenzo Allegrucci]

Hi all, it's not clear to me whether nf_conntrack_sip does SIP and RTP connection
tracking or just SIP.. can you clarify?
I need to match both SIP and RTP packets and I was wondering if the rule
below would satisfy my requirements:

iptables -t mangle -A FORWARD -o eth0 -m helper --helper sip -j CLASSIFY --set-class 1:1


Thank you,

Re: match SIP & RTP packets

[Patrick McHardy]

Lorenzo Allegrucci wrote:
> 
> Hi all, it's not clear to me whether nf_conntrack_sip does SIP and RTP
> connection
> tracking or just SIP.. can you clarify?
> I need to match both SIP and RTP packets and I was wondering if the rule
> below would satisfy my requirements:
> 
> iptables -t mangle -A FORWARD -o eth0 -m helper --helper sip -j CLASSIFY
> --set-class 1:1

Almost, this will match on RTP packets and incoming signalling
connections (-m helper matches on expected connections). What's
missing is the original signalling connection on port 5060.

Re: match SIP & RTP packets

[Ming-Ching Tiew]

--- On Thu, 12/3/09, Patrick McHardy <kaber@trash.net> wrote:

> From: Patrick McHardy <kaber@trash.net>
> Subject: Re: match SIP & RTP packets
> To: "Lorenzo Allegrucci" <lorenzo.allegrucci@forinicom.it>
> Cc: netfilter@vger.kernel.org, netdev@vger.kernel.org
> Date: Thursday, December 3, 2009, 11:11 AM
> Lorenzo Allegrucci wrote:
> > 
> > Hi all, it's not clear to me whether nf_conntrack_sip
> does SIP and RTP
> > connection
> > tracking or just SIP.. can you clarify?
> > I need to match both SIP and RTP packets and I was
> wondering if the rule
> > below would satisfy my requirements:
> > 
> > iptables -t mangle -A FORWARD -o eth0 -m helper
> --helper sip -j CLASSIFY
> > --set-class 1:1
> 
> Almost, this will match on RTP packets and incoming
> signalling
> connections (-m helper matches on expected connections).
> What's
> missing is the original signalling connection on port
> 5060.
> --

So there is no way to identify it based on NEW connection state ?

(... Want to route new SIP calls to different locations .... )

Regards.


      

Re: match SIP & RTP packets

[Lorenzo Allegrucci]

Patrick McHardy wrote:
> Lorenzo Allegrucci wrote:
>> Hi all, it's not clear to me whether nf_conntrack_sip does SIP and RTP
>> connection
>> tracking or just SIP.. can you clarify?
>> I need to match both SIP and RTP packets and I was wondering if the rule
>> below would satisfy my requirements:
>>
>> iptables -t mangle -A FORWARD -o eth0 -m helper --helper sip -j CLASSIFY
>> --set-class 1:1
> 
> Almost, this will match on RTP packets and incoming signalling
> connections (-m helper matches on expected connections). What's
> missing is the original signalling connection on port 5060.

It doesn't work for me, but when I run the above
iptables rule it loads just the following modules:

nf_conntrack_ipv4      13352  1
nf_defrag_ipv4          1756  1 nf_conntrack_ipv4
xt_helper               1788  1
nf_conntrack           67608  2 nf_conntrack_ipv4,xt_helper

it doesn't load nf_conntrack_sip as I would expect..
(although it gives no errors)

I'll try again loading nf_conntrack manually and playing with
its parameters.