Async processing using NetFilters

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Hi All,
I'm using Linux RedHat 9  kernel version 2.4.20-8
I want to do some asynchronous processing of packets in my kernel module that is registered as Netfilter Hook. I tried to make use of NF_QUEUE but found that only one call back function per protocol family (PF) is provided and already some module (probably NET_LINK socket interface) is making use of it for PF_INET. Is there any way to use NF_QUEUE facility without disturbing NET_LINK ? why per hook registration of call back function of NF_QUEUE is not provided? How to proceed if someone had to do async processing of packets so that pkts can be queued to crypto hardware processing unit and can be safely reinjected back into kernel later so that other registered hooks can get pkts?
any help is highly appreciated.
Thanks
-Lokesh.



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