access IP header in packet

linux_lover2005 · 04-10-2005, 08:27 AM

hello,
Does skbuffs provide facility to access other layers headers at any layer? I want to access IP addresses(SRC & DST) of packets is readable at Link layer that mean before IP header is removed from skbuff packet structure? I am doing this in kernel source code.

live_dont_exist · 04-10-2005, 09:59 AM

hey mate,
I believe u should find your answer in the structures listed in /usr/include/netinet/ip.h..if I am not mistaken .It either ip.h or ipv4.h..You hve the entire structure of the IP headers there which you can actually manipulate to suit your code. Is this what you are referring to?..please post back if understanding is incorrect.
thnx
Arvind

linux_lover2005 · 04-10-2005, 09:15 PM

hello,
There is no problem to include those header files in source program that contains the headers structures. What i want in linux kernel source of network stack is that to access IP header fields before that header is removed. Remember i want to access skbuff structure's field ip header before ip header is removed.

alred · 04-11-2005, 01:02 AM

might be from nh

there is a similar problem in somewhere else
below are links to the question and reply showing IP addresses in their code :

problems :
http://mail.nl.linux.org/kernelnewbi.../msg00054.html

reply :
http://mail.nl.linux.org/kernelnewbi.../msg00077.html

just for extra reference :
http://gnumonks.org/ftp/pub/doc/skb-doc.html

is it the skbuff that you mentioned ?
never try skbuff before but looks interesting and really hopes these can help you

regards