From nobody@FreeBSD.org  Thu Nov 12 21:10:29 2009
Return-Path: <nobody@FreeBSD.org>
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 7091410656A4
	for <freebsd-gnats-submit@FreeBSD.org>; Thu, 12 Nov 2009 21:10:29 +0000 (UTC)
	(envelope-from nobody@FreeBSD.org)
Received: from www.freebsd.org (www.freebsd.org [IPv6:2001:4f8:fff6::21])
	by mx1.freebsd.org (Postfix) with ESMTP id 5F1B78FC4B
	for <freebsd-gnats-submit@FreeBSD.org>; Thu, 12 Nov 2009 21:10:29 +0000 (UTC)
Received: from www.freebsd.org (localhost [127.0.0.1])
	by www.freebsd.org (8.14.3/8.14.3) with ESMTP id nACLASEt069955
	for <freebsd-gnats-submit@FreeBSD.org>; Thu, 12 Nov 2009 21:10:28 GMT
	(envelope-from nobody@www.freebsd.org)
Received: (from nobody@localhost)
	by www.freebsd.org (8.14.3/8.14.3/Submit) id nACLASNR069948;
	Thu, 12 Nov 2009 21:10:28 GMT
	(envelope-from nobody)
Message-Id: <200911122110.nACLASNR069948@www.freebsd.org>
Date: Thu, 12 Nov 2009 21:10:28 GMT
From: "Stephane D'Alu" <sdalu@sdalu.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: pf doesn't block udp packets on multicast addresses
X-Send-Pr-Version: www-3.1
X-GNATS-Notify:

>Number:         140512
>Category:       kern
>Synopsis:       [pf] pf doesn't block udp packets on multicast addresses
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-pf
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Nov 12 21:20:01 UTC 2009
>Closed-Date:    Fri Nov 13 08:21:54 UTC 2009
>Last-Modified:  Fri Nov 13 08:21:54 UTC 2009
>Originator:     Stephane D'Alu
>Release:        8.0-RC2
>Organization:
>Environment:
FreeBSD incal.sdalu.com 8.0-RC2 FreeBSD 8.0-RC2 #14: Mon Nov  9 23:14:33 CET 2009     root@incal.sdalu.com:/usr/obj/usr/src/sys/INCAL  amd64

>Description:
for udp firewall rule is somewhat equivalent to (full rules available on request)

set skip on lo0
scrub in all
block in log all
pass out all
pass in proto { tcp, udp } from any to net0 port domain
pass in proto udp from any to net0 port { isakmp, 4500 }

When sniffing net0 with tcpdump the following packet will show up:

ks358229.kimsufi.com.mdns > 224.0.0.251.mdns
rbx-48-m2.routers.ovh.net.1985 > ALL-ROUTERS.MCAST.NET.1985
pastel-pink.feralhosting.com.6771 > 239.192.152.143.6771
ks358206.kimsufi.com.50914 > 239.255.255.250.1900

They all seems to be using multicast addresses
 (Dont know if broadcast or tcp have the same issue)
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-pf 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Thu Nov 12 22:31:46 UTC 2009 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=140512 
State-Changed-From-To: open->closed 
State-Changed-By: remko 
State-Changed-When: Fri Nov 13 08:21:53 UTC 2009 
State-Changed-Why:  
Traffic is being shown before hitting the firewall rule. (Chris 
Buechler) 

http://www.freebsd.org/cgi/query-pr.cgi?pr=140512 
>Unformatted:
