Date: Thu, 20 May 1999 21:38:21 +0200 From: Pierre Beyssac <pb@fasterix.freenix.org> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com>, Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/net if_var.h Message-ID: <19990520213821.D68481@fasterix.frmug.fr.net> In-Reply-To: <199905201859.LAA03059@gndrsh.aac.dev.com>; from Rodney W. Grimes on Thu, May 20, 1999 at 11:59:18AM -0700 References: <199905201613.MAA18325@khavrinen.lcs.mit.edu> <199905201859.LAA03059@gndrsh.aac.dev.com>
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On Thu, May 20, 1999 at 11:59:18AM -0700, Rodney W. Grimes wrote:
> but then rt_refcnt =! ifa_refcnt so we are okay there... but down a little
> further:
> struct ifaddr *rt_ifa;
> These two fields represent the ``answer'', as it were, to
> the question posed by a route lookup; that is, they name
> the interface and interface address to be used in sending a
> packet to the destination or set of destinations which this
> route represents.
>
The reference to rtentry(9) by route(4) only affects struct
rt_metrics, which is not affected by struct ifaddr (only contains
a series of u_long's), and the flags definitions.
man 4 route:
...
where ``struct rt_metrics'' and the flag bits are as defined in
rtentry(9).
...
> Looks like it is an explicit kernel/user land interface via the routing
> socket to me....
I disagree.
One other possible way a program could be affected was if it accessed
the routing structures through /dev/kmem. In a way it can be
considered a kernel/userland interface, and by the same reasonning
you wouldn't be able to change any internal structure in the kernel.
I don't mean to split hairs, I just want to show that a line has
to be drawn somewhere.
In the same spirit, note that ps and libkvm frequently undergo
changes that make them dependent on the kernel version.
--
Pierre Beyssac pb@fasterix.frmug.org pb@fasterix.freenix.org
{Free,Net,Open}BSD, Linux : il y a moins bien, mais c'est plus cher
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