How to include kernel headers in a program

Question

I am writing a libnetfilter_queue program. I am new to linux kernel programming. I need to include linux/skbuff.h, net/checksum.h and many related kernel headers which are not present in /usr/include/linux. I get following error on compilation

 fatal error: linux/skbuff.h: No such file or directory
 fatal error: net/checksum.h: No such file or directory

Solution

try this find / -name skbuff.h 2>/dev/null then when it finds the location use the -I/path/to/folder when you compile your program.. If it doesn't find the header you don't have it!

Comments

[shkschneider]

find /usr [...] should be enough ^^

[adnan kamili]

I added the path /usr/src/linux-headers-3.2.0-32/include/ but i get following error : /usr/src/linux-headers-3.2.0-32/include/linux/bitops.h:22:24‌​: fatal error: asm/bitops.h: No such file or directory

[pyCthon]

do you know how to add a directory to your path?

[adnan kamili]

g++ -Wall -I /usr/src/linux-headers-3.2.0-32/include/ -o filter -lnetfilter_queue

[pyCthon]

thats a no, type $PATH in terminal copy paste that then go to your home directory and type vi .bashrc add what your copied and add your desired directory to include it in the search path see if that works for example PATH=$PATH:/usr/src/linux-headers-3.2.0-32/include/:$HOME/bi‌​n