Registering for only Specific Packets from Net-Filter!!!!

[shivanth]

On 11/17/2011 2:06 PM, Abhijit Pawar wrote:
> On 11/17/2011 12:03 PM, Mulyadi Santosa wrote:
>> On Wed, Nov 16, 2011 at 17:50, Kesava Srinivas<vunnavafuture at gmail.com>  wrote:
>>> HI Guys,
>>>
>>> I'm a Newbie to Linux Kernel Development. Need some Clarification in
>>> understanding Net-Filter Hooks.
>>>
>>> Can I register only for the Necessary Packets [Ex: IPSEC etc...] from the
>>> Net-Filters?? AFAIK ; Net-Filter Module send the Packets to the
>>> Corresponding Module based on pre-defined HOOKS. Let us say; there are Many
>>> Packets reaching that Hooks; and if I am Interested only in some Packets
>>> from Net-Filter module; can I do that ???
>> something like:
>> iptables [some rules] -j ULOG
>> ?
>>
>> Check "man iptables" and see if that suits your need. FYI ULOG target
>> uses netlink to deliver the packet to user space for further
>> processing.
>>
>>
>>
> Hi Kesava Srinivas,
> If this is for any application in user space, I would recommend you take 
> a look at libPcap.
>
> Regards,
> Abhijit Pawar
Why don't you check for the  type of the received packet ( taken from
the queue) in your hook function and process it if matches your
requirement else just return NF_ACCEPT  so that it is processed by other
hooks.
Regards
Shivanth
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