Re: [SLUG] kernel code for client ephemeral port allocation?

[Sonia Hamilton <sonia@xxxxxxxxxxxx>]

Thanks! S.

On Tue, 2008-04-08 at 08:13 +1000, Erik de Castro Lopo wrote:
> Sonia Hamilton wrote:
> 
> > When a tcp (or udp) connection is setup, the client is allocated a
> > source port - a so-called ephemeral port (this can be seen in the Local
> > Address column of netstat).
> > 
> > Out of interest, I wouldn't mind looking at the code that
> > pseudo-randomly allocates this port number. Can anyone point me in the
> > direction of the directory (or even file) I should look at? I'm not 
> > very familiar with the layout of the kernel code.
> 
> LXR (Linux Cross Reference) is a really good resource:
> 
>     http://lxr.linux.no/linux
> 
> Searching for ephemeral results in (among others):
> 
>     http://lxr.linux.no/linux/drivers/char/random.c#L1567
> 
> which I think may be what you are looking for.
> 
> The hard way to do this of course would be just grab an unzip a source
> code tarball, cd into it and then:
> 
>    grep -r ephemeral .
> 
> and see where that leads you.
> 
> Have fun :-).
> 
> Erik
> -- 
> -----------------------------------------------------------------
> Erik de Castro Lopo
> -----------------------------------------------------------------
> "The question of whether a computer can think is no more interesting
> than the question of whether a submarine can swim." -- edsger dijkstra
-- 
Thanks,

Sonia Hamilton
http://soniahamilton.wordpress.com
http://www.linkedin.com/in/soniahamilton