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From: Bill Fenner <fenner@parc.xerox.com>
To: freebsd-current@FreeBSD.org
Subject: if_de: BPF problems, auto interface switching?
Cc: fenner@parc.xerox.com
Message-Id: <95May3.090055pdt.49859@crevenia.parc.xerox.com>
Date: Wed, 3 May 1995 09:00:45 PDT
Sender: current-owner@FreeBSD.org
Precedence: bulk

I have experienced two problems with if_de.c:

1) The BPFILTER logic is a little warped; the existing code only lets
multicasts through if you have a bpf listener.  Here is a patch.

*** if_de.c.orig	Wed May  3 08:36:36 1995
--- if_de.c	Wed May  3 08:37:47 1995
***************
*** 567,577 ****
  #if NBPFILTER > 0
  	    if (sc->tulip_bpf != NULL) {
  		bpf_tap(sc->tulip_bpf, mtod(m, caddr_t), total_len);
! 		if ((eh.ether_dhost[0] & 1) == 0 &&
  		    !TULIP_ADDREQUAL(eh.ether_dhost, sc->tulip_ac.ac_enaddr))
- 		    goto next;
- 	    } else if (!TULIP_ADDREQUAL(eh.ether_dhost, sc->tulip_ac.ac_enaddr)
- 		    && !TULIP_ADDRBRDCST(eh.ether_dhost)) {
  		    goto next;
  	    }
  #endif
--- 567,575 ----
  #if NBPFILTER > 0
  	    if (sc->tulip_bpf != NULL) {
  		bpf_tap(sc->tulip_bpf, mtod(m, caddr_t), total_len);
! 		if (sc->tulip_if.if_flags & IFF_PROMISC &&
! 		    (eh.ether_dhost[0] & 1) == 0 &&
  		    !TULIP_ADDREQUAL(eh.ether_dhost, sc->tulip_ac.ac_enaddr))
  		    goto next;
  	    }
  #endif

2) I sometimes get

May  3 08:42:35 fenestro /kernel: de0: enabling 10baseT/UTP port

I can't relate this happening to any real-world action (besides, of course,
me losing my network connectivity, but there's some cause-effect relationship
there =).  If I "ifconfig de0 link2" it comes back, and says

May  3 08:44:30 fenestro /kernel: de0: enabling Thinwire/AUI port

I assume that if I ifconfig link2 at startup, it will stop trying to do
autoswitching (I have yet to confirm this, of course =), but it might
be good to know that autoswitching may not work perfectly.

(My card is a Linksys "EtherPCI LAN card".)

  Bill