Date: Wed, 23 Oct 2002 11:03:21 -0700 (PDT) From: Andriy Gapon <avg@icyb.net.ua> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/44417: ipfw layer2 rules are not checked for ether_output_frame() on bridged interface Message-ID: <200210231803.g9NI3LDs088114@www.freebsd.org>
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>Number: 44417
>Category: kern
>Synopsis: ipfw layer2 rules are not checked for ether_output_frame() on bridged interface
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Oct 23 11:10:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Andriy Gapon
>Release: 4.7-RELEASE
>Organization:
>Environment:
FreeBSD terminus.foundation.invalid 4.7-RELEASE FreeBSD 4.7-RELEASE #3: Fri Oct 18 16:09:53 EDT 2002 avg@edge.foundation.invalid:/sys-devel/obj/sys-devel/src/sys/TERMINUS.bridge i386
>Description:
with both net.link.ether.ipfw=1 and net.link.ether.bridge_ipfw=1 packets transmitted via an interface that is a part of a bridge cluster are not checked against ipfw rules in either ether_output_frame() or bdg_forward(). This means that traffic originating from a bridging host or routed from non-bridged interface will not be checked agains layer2-specific ipfw rules. this problem is only specific IPFW2, because with IPFW1 you can set layer2 rules anyway.
>How-To-Repeat:
on a bridinging host with IPFW2,
Actions:
1. sysctl net.link.ether.ipfw=1
2. sysctl net.link.ether.bridge_ipfw=1
3. ipfw add 1 allow mac <mac address of host H on bridged subnet> any
4. ping H
Result:
rule 1 will not have any matches
>Fix:
it's very tempting to suggest to remove check for src != NULL at sys/net/bridge.c:860, but not being an expert in the network code, I am not sure about possible interdependencies/side-effects.
>Release-Note:
>Audit-Trail:
>Unformatted:
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