libpcap + netlink socket

[madhuresh <madhurag () iitk ac in>]

Hello friends,

In the present architecture of linux kernel, 802.11 mac details are lost 
at the driver level.

I wish to filter packets (collected on wireless interface wlan0) based 
on their signal strength (present in 802.11 mac). For this i wish to set 
filter code in the driver (hostap in my case). The packet which passes 
the filter should then be received by libpcap which directly passes it 
to tcpdump for parsing.

So i need to have communication between libpcap and driver( to set 
filter options and for collecting the packets with 802.11 mac), which to 
my understanding can be done using netlink sockets. Please let me know 
if i am correct. Shall i use ioctl call for setting the filter options 
and netlink socket to transfer the complete (with 802.11 mac) packet. 
Also i need to prevent libpcap from reading from linux kernel (which it 
does in the existing code) but rather read the packet from netlink 
socket created between it and the driver. Let me know if i am thinking 
correctly and is it feasible.

A quick reply will be highly appreciated.

Thanks

-Madhuresh

PS: Please forgive me for poor english

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