tree 42b47bc693694767bff2820811896a7b1580b58d
parent 6d8ebc8a27e1b187abfb06dd79b35a393aa9f2a2
author Kelvie Wong <kelvie@ieee.org> 1335969564 +0000
committer Pablo Neira Ayuso <pablo@netfilter.org> 1336498859 +0200

netfilter: nf_ct_expect: partially implement ctnetlink_change_expect

This refreshes the "timeout" attribute in existing expectations if one is
given.

The use case for this would be for userspace helpers to extend the lifetime
of the expectation when requested, as this is not possible right now
without deleting/recreating the expectation.

I use this specifically for forwarding DCERPC traffic through:

DCERPC has a port mapper daemon that chooses a (seemingly) random port for
future traffic to go to. We expect this traffic (with a reasonable
timeout), but sometimes the port mapper will tell the client to continue
using the same port. This allows us to extend the expectation accordingly.

Signed-off-by: Kelvie Wong <kelvie@ieee.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>