Messages in this thread | | | From | "Josan Kadett" <> | Subject | RE: Entirely ignoring TCP and UDP checksum in kernel level | Date | Sat, 21 Aug 2004 11:35:20 +0200 |
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-----Original Message----- From: Lee Revell [mailto:rlrevell@joe-job.com] Sent: Saturday, August 21, 2004 10:26 AM To: Josan Kadett Cc: 'Denis Vlasenko'; linux-kernel Subject: RE: Entirely ignoring TCP and UDP checksum in kernel level
On Sat, 2004-08-21 at 05:18, Josan Kadett wrote: > That is not much of an intelligible idea. A way to hack the kernel could be > found as I still presume. "Turn off checksums" but not by re-writing the > whole tcp code in the kernel. Isn't that possible ? Linux is an operating > system of infinite possibilities, right ? But only if you know how to hack > it... >
>> Can't you just go into the networking code, and find the part where it >> checks the checksum, and just have it return success, even if the >> checksum was bad? Seems like a quick copy and paste hack. Am I missing >> something?
>> Lee
Very well, it is what I really wish to do. The networking code is no simple issue in linux. As I underlined, two c files, tcp_input.c and udp.c controls how the checksum is done and the code looks very complicated. Perhaps you have some idea about where in 100K source code to change in order to disable checksumming but at the same time not to break normal operation. I can apply a change in the code, recompile the kernel and test it. I have installed a virtual machine running linux in order to experiment with the settings, but the problem is that I do not have enough time to understand what the code is all about. Perhaps it is in sock.h, perhaps skbuff.h, or any other file. Each and every file seems to contain some function related to checksumming.
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