cvs commit: src/sys/net if_gif.c

[Ruslan Ermilov]

On Tue, Mar 30, 2004 at 03:25:17PM -0800, Brooks Davis wrote:
> On Wed, Mar 31, 2004 at 01:03:49AM +0300, Ruslan Ermilov wrote:
> > On Mon, Mar 22, 2004 at 06:24:26AM -0800, Robert Watson wrote:
> > > rwatson     2004/03/22 06:24:26 PST
> > > 
> > >   FreeBSD src repository
> > > 
> > >   Modified files:
> > >     sys/net              if_gif.c 
> > >   Log:
> > >   Move "called", a static function variable used to detect recursive
> > >   processing with gif interfaces, to a global variable named "gif_called".
> > >   Add an annotation that this approach will not work with a reentrant
> > >   network stack, and that we should instead use packet tags to detect
> > >   excessive recursive processing.
> > >   
> > >   Revision  Changes    Path
> > >   1.42      +11 -4     src/sys/net/if_gif.c
> > > 
> > Implemented this in the attached patch.  Note when testing: setting
> > net.link.gif.max_nesting too high (>20 on my system) and triggering
> > the recursion causes the kernel stack exhaustion.
> 
> Why not just do what OpenBSD does and do actual loop detection?  This
> gets rid of the nesting count hack which isn't really what you want to
> measure anyway.
> 
> http://www.openbsd.org/cgi-bin/cvsweb/src/sys/net/if_gif.c.diff?r1=1.18&r2=1.19
> 
Good idea.  I will implement it and repost the updated patch here.


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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