Date: Thu, 20 May 1999 11:59:18 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: wollman@khavrinen.lcs.mit.edu (Garrett Wollman) Cc: pb@FreeBSD.org (Pierre Beyssac), cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/net if_var.h Message-ID: <199905201859.LAA03059@gndrsh.aac.dev.com> In-Reply-To: <199905201613.MAA18325@khavrinen.lcs.mit.edu> from Garrett Wollman at "May 20, 1999 12:13:08 pm"
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> <<On Thu, 20 May 1999 08:38:22 -0700 (PDT), "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> said:
>
> > HEADSUP -- This will require compilation of many userland applications
> > that have to deal with networking code due to the change in the size
> > of the struct. In particular anything that prints route metrics or
> > tries to deal with them will barf :-(.
>
> If it does, it's got a seriously erroneous implementation. User-land
> code has no business looking at struct ifaddr.
Aren't these passed in and out via the kernel routing socket? Hummm..
man 4 route seems to say not, but man 9 rtentry shows that:
short rt_refcnt;
Route entries are reference-counted; this field indicates
the number of external (to the radix tree) references. If
the RTF_UP flag is not present, the rtfree() function will
delete the route from the radix tree when the last refer-
ence drops.
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.
Looks like it is an explicit kernel/user land interface via the routing
socket to me....
--
Rod Grimes - KD7CAX - (RWG25) rgrimes@gndrsh.aac.dev.com
Accurate Automation, Inc. Reliable computers for FreeBSD
http://www.aai.dnsmgr.com
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