 | | | modifying the data in sk_buff | modifying the data in sk_buff 2004-06-17 - By K S SUNDEEP REDDY
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hi
i am trying to write a sniffer kind of program( a linux kernel module)
which resides just above the device driver layer and intercepts all the
incoming packets. This program is being written for testing the robustness
of IP protocol as a part of my final year project so i need to modify the
data present in sk_buff structure. i have gone through several webpages
but i am unable to find how to modify the data. can anyone suggest a good
reference or explain how to do this.
to give you an example:
i have server program listening on port 1500 for TCP connections.
then i use a client program to connect to this server.
these two programs are very simple. the client sends data and the server
prints out the received data to STDOUT.
now what i want to do is if the client sends the data "sundeep"
i want to modify the data to "sundeep is a kernel newbie" and the server
should receive this.
to make it more clear my program resides on the machine running the server
application.
i have done the following (but i didnt get any results)
i used skb_copy_exapand();
then i modified the data;
then i recalculated all the checksums;
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