Re: CVS commit: src/tests/net/icmp

[Thomas Klausner <wiz%NetBSD.org@localhost>]

On Sun, Jul 04, 2010 at 07:31:00PM +0000, Antti Kantee wrote:
> Module Name:  src
> Committed By: pooka
> Date:         Sun Jul  4 19:30:59 UTC 2010
> 
> Added Files:
>       src/tests/net/icmp: Atffile Makefile t_forward.c
> 
> Log Message:
> Add test case for PR kern/43548
> 
> Due to the nature of the feature under test, this one is a little
> different, so let me explain how it works.
> 
> The test program forks and bootstraps a rump kernel in both processes.
> It then configures shared memory interfaces in both.  shmif is nice
> in that it uses a mmaped file as the bus and does not require root
> privileges for communication between two (or more) processes.  The
> child process then proceeds to increase icmp.returndatabytes as
> indicated by the PR, while the parent process sets the global TTL
> of the rump kernel to 1 (note: both values only affect the respective
> rump kernels, not each other or more importantly the host kernel).
> The parent then sends the bad packet which is supposed to be routed
> by the child.  If ip_icmp.c was too old, *boom* + fail; otherwise
> nothing bad happens and the test exists with success after one
> second.
> 
> Eventually this test can be extended into a framework for automated
> testing of any networking code which requires (arbitrarily complex)
> routing setups.

I don't understand exactly how you're doing this, but I admire what
you can do with it now :)
 Thomas