netdev - Re: IPV6_RTHDR with a type-0 routing header

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Date:	Thu, 20 Aug 2009 14:53:44 +0200
From:	Jens Rosenboom <jens@...one.net>
To:	"Steinar H. Gunderson" <sgunderson@...foot.com>
Cc:	Rémi Denis-Courmont <remi@...lab.net>,
	netdev@...r.kernel.org
Subject: Re: IPV6_RTHDR with a type-0 routing header

On Thu, 2009-08-20 at 14:39 +0200, Steinar H. Gunderson wrote:
> On Thu, Aug 20, 2009 at 02:18:20PM +0200, Steinar H. Gunderson wrote:
> > Hm, OK. And no replacement has been proposed, the deprecation RFC just refers
> > to "future routing headers"...
> 
> It looks like I can use destination options instead, but those don't seem to
> be too easy to use either. The kernel seems to demand that I put eight bytes
> of padding at the end?
> 
>   #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
> 
> Why the +1? 

Because that matches the definition of the hdrlen field in RFC2460.

> FWIW, the program I try to run is at http://home.samfundet.no/~sesse/v6fun.c .
> If I replace "len" in the setsockopt call by "len + 8", the program runs and
> the packets get the right option attached -- but also eight padding bytes.

ERROR 404: Not Found.

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