On Sunday 04 January 2004 2:14 am, yu5p97f02@xxxxxxxxxxxxxx wrote:
> For protocols which work by initiating a request using a UDP broadcast and
> expecting a reply for a specific host, is there any way to match the reply
> back to the original broadcast.
>
> An example of something that does this is smbmount, a request is broadcast
> to the localnet with a port set to the netbios-ns port, and then smbmount
> expects a reply from a particular host to the initiating port.
Not with the existing connection tracking code, no.
It shouldn't be too hard to write a conntrack helper for such a protocol which
enables reply packets to be recognised as Related, however - all it would
need to do is match:
destination IP = original source IP
destination port = original source port
source IP is within network range of original broadcast destination IP
source port = original destination port
If you wanted to do a 'quick and dirty' version then you could even not bother
about the source IP, and match packets where just the other three were
correct - this would then be an almost trivial hack of the current conntrack
code, I expect.
Regards,
Antony.
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