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Message-Id: <200208132010.g7DKAVO6069874@www.freebsd.org>
Date: Tue, 13 Aug 2002 13:10:31 -0700 (PDT)
From: Lars Eggert <larse@isi.edu>
To: freebsd-gnats-submit@FreeBSD.org
Subject: bridging when one interface has no carrier
X-Send-Pr-Version: www-1.0

>Number:         41632
>Category:       kern
>Synopsis:       bridging when one interface has no carrier
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    luigi
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Aug 13 13:20:01 PDT 2002
>Closed-Date:    
>Last-Modified:  Mon Dec  2 07:10:01 PST 2002
>Originator:     Lars Eggert
>Release:        4.6-RELEASE
>Organization:
USC/ISI
>Environment:
FreeBSD hbo.isi.edu 4.6-RELEASE FreeBSD 4.6-RELEASE #0: Tue Aug  6 09:17:32 PDT 2002     root@hbo.isi.edu:/usr/src/sys/compile/KERNEL-1.40  i386

>Description:
FreeBSD box with two Ethernet NICs, e.g. if0 with IP address A and if1 with IP address B, bridged together:

net.link.ether.bridge_cfg: if0 if1
net.link.ether.bridge: 1

Interface if0 is plugged in (has carrier), if1 isn't (no carrier). Packets arriving on if0 for IP address B are not received by the machine.
>How-To-Repeat:
See above.
>Fix:
      
>Release-Note:
>Audit-Trail:

From: Lars Eggert <larse@ISI.EDU>
To: freebsd-gnats-submit@FreeBSD.org
Cc:  
Subject: Re: kern/41632: bridging when one interface has no carrier
Date: Mon, 19 Aug 2002 12:47:28 -0700

 This is a cryptographically signed message in MIME format.
 
 --------------ms090503040502050506000805
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 A more detailed explanation with some clarifications:
 
 I have a machine with to Ethernet interfaces, if0 and if1. They are 
 bridged together, if0 has IP address A, if1 doesn't have one. There are 
 applications listening on IP address A. When if0 is down, packets 
 destined for A (or broadcast) coming in over if1 aren't received by 
 these applications.
 
 This seems wrong. Conceptually, a set of bridged interfaces should have 
 a single IP address assigned to it, and processes listening on that IP 
 address should receive packets whether or not some of the interfaces in 
 the bridge are down.
 
 We currently approximate this by having one interface in the bridge set 
 carry the IP address. This works fine UNLESS that interface happens to 
 be down. In that case, packets fall on the floor.
 
 -- 
 Lars Eggert <larse@isi.edu>           USC Information Sciences Institute
 
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From: Lars Eggert <larse@ISI.EDU>
To: freebsd-gnats-submit@FreeBSD.org
Cc:  
Subject: Re: kern/41632: bridging when one interface has no carrier
Date: Fri, 25 Oct 2002 15:36:13 -0700

 This is a cryptographically signed message in MIME format.
 
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  boundary="------------050803080807030309010901"
 
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 --------------050803080807030309010901
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 Here's a patch that fixes the issue.
 
 Lars
 -- 
 Lars Eggert <larse@isi.edu>           USC Information Sciences Institute
 
 
 --------------050803080807030309010901
 Content-Type: text/plain;
  name="bridge.patch"
 Content-Transfer-Encoding: 7bit
 Content-Disposition: inline;
  filename="bridge.patch"
 
 --- bridge.c.old	Thu Oct 24 16:21:45 2002
 +++ bridge.c	Fri Oct 25 12:02:26 2002
 @@ -104,6 +104,7 @@
  #include <net/if.h>
  #include <net/if_types.h>
  #include <net/if_var.h>
 +#include <net/bpf.h>
  
  #include <netinet/in.h> /* for struct arpcom */
  #include <netinet/in_systm.h>
 @@ -1015,6 +1016,21 @@
  		    return m0 ; /* the original is still there... */
  		}
  	    }
 +
 +	    /*
 +	     * Deliver a copy of the packet to the bpf even if the interface
 +	     * has no carrier. This fixes kern/41632.
 +	     */
 +	    if ((!(last->if_flags & IFF_OACTIVE)) && last->if_bpf != NULL) {
 +		struct m_hdr mh;
 +
 +		/* This kludge is OK; BPF treats the "mbuf" as read-only */
 +		mh.mh_next = m;
 +		mh.mh_data = (char *)eh;
 +		mh.mh_len = ETHER_HDR_LEN;
 +		bpf_mtap(last, (struct mbuf *)&mh);
 +            }
 + 
  	    /*
  	     * Add header (optimized for the common case of eh pointing
  	     * already into the mbuf) and execute last part of ether_output:
 
 
 --------------050803080807030309010901--
 
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 --------------ms030404010501020909000703--
 
Responsible-Changed-From-To: freebsd-bugs->luigi 
Responsible-Changed-By: luigi 
Responsible-Changed-When: Mon Nov 18 14:16:46 PST 2002 
Responsible-Changed-Why:  
remember to look at the PR 


http://www.freebsd.org/cgi/query-pr.cgi?pr=41632 

From: Lars Eggert <larse@ISI.EDU>
To: freebsd-gnats-submit@FreeBSD.org, larse@ISI.EDU
Cc:  
Subject: Re: kern/41632: bridging when one interface has no carrier
Date: Mon, 02 Dec 2002 07:03:08 -0800

 This is a cryptographically signed message in MIME format.
 
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 Updated problem description and patches at 
 http://www.isi.edu/larse/software.html.
 
 Lars
 -- 
 Lars Eggert <larse@isi.edu>           USC Information Sciences Institute
 
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