From owner-freebsd-hackers  Mon Jun  3 21:04:58 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id VAA11986
          for hackers-outgoing; Mon, 3 Jun 1996 21:04:58 -0700 (PDT)
Received: from whistle.com (s205m131.whistle.com [207.76.205.131])
          by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id VAA11981
          for <freebsd-hackers@freebsd.org>; Mon, 3 Jun 1996 21:04:57 -0700 (PDT)
Received: (from smap@localhost) by whistle.com (8.7.5/8.6.12) id VAA01778; Mon, 3 Jun 1996 21:04:26 -0700 (PDT)
Received: from bubba.whistle.com(207.76.205.7) by whistle.com via smap (V1.3)
	id sma001776; Mon Jun  3 21:04:05 1996
Received: (from archie@localhost) by bubba.whistle.com (8.6.12/8.6.12) id VAA06798; Mon, 3 Jun 1996 21:04:05 -0700
From: Archie Cobbs <archie@whistle.com>
Message-Id: <199606040404.VAA06798@bubba.whistle.com>
Subject: Re: NULL interface field in ip_fw_chk
To: ormonde@trem.cnt.org.br (Rodrigo Ormonde)
Date: Mon, 3 Jun 1996 21:04:05 -0700 (PDT)
Cc: freebsd-hackers@freebsd.org
In-Reply-To: <9605221807.AA08687@trem.cnt.org.br> from "Rodrigo Ormonde" at May 22, 96 03:07:11 pm
X-Mailer: ELM [version 2.4 PL24]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk


> int ip_fw_chk(mbuf *m, struct ip *ip, struct ifnet *rif, ...
>  
>    Looking into the code of ip_fw_chk, I realise that sometimes this function
> is called with rif = NULL.
> 
>    My question is: does anybody knows why and under what circunstances the
> ip_fw_chk is called with a NULL pointer in the interface field ? (the 
> ip_fw_chk function is called only by ip_input.c)

Perhaps when a packet didn't come in on any interface, i.e., it was
generated locally (for example, a kernel generated ICMP).

-Archie

___________________________________________________________________________
Archie L. Cobbs, archie@whistle.com  *  Whistle Communications Corporation