Messages in this thread | | | Date | Wed, 23 May 2001 20:23:32 +0200 | From | Andi Kleen <> | Subject | Re: Selectively refusing TCP connections |
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On Wed, May 23, 2001 at 06:59:02PM +0100, Ben Mansell wrote: > Hi all, > > Is there any mechanism in Linux for refusing incoming TCP connections? > I'd like to be able to fetch the next incoming connection on a listen > queue, and selectively accept or reject it based on the IP address of the > client. I know this could be done via firewall rules, but for this case, > I'd like an application to have the final say on whether the connection > will be accepted.
You can push a BPF (LPF) filter expression onto a LISTEN socket that checks every incoming packet using SO_ATTACH_FILTER.
The only way to do it fully in an application is probably to set up netfilter NAT to forward the connection to some local process; or alternative push the packets using a netfilter queue target to a user process and forward/ disable firewall rules dynamically.
-Andi
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