Re: [RFC] SIP conntrack handler and TCP fragmentation

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Ulrich Weber <uweber.linux@xxxxxxxxx> wrote:
> From reading the code this fixed the problem when Content-Length
> points to one of the next TCP fragments.

Right.

> In our case Content-Length is always 0 with a couple of SUBSCRIBE calls.
> E.g. a TCP packet starting with this will break the SIP connection tracking:
> 
> INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE
> Content-Length: 0

Ugh.

I guess it makes sense to detect this and then accept for this case too.

> The previous TCP packet was accepted by SIP connection tracking
> because it had no Content-Length field.

Perhaps we should treat Content-length of 0 like "no Conent-Length
field".
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