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iam trying to built a firewall.so i have used netfilter for it.
in function main_hook sock_buff is returning null and in my log file continuously "sock buff null" is printed plse help to solve this...

thanks for ur replay..
i got it.:b:

i wrote handler for sigsegv such that i can allocate memory for a variable to which
sigsegv generated for illlegal acces of memory.

my code is

#include <signal.h>
#include<stdio.h>...