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Date: Sat, 10 Jun 2000 10:43:42 -0700 (PDT)
From: koji@jp.above.net
To: freebsd-gnats-submit@FreeBSD.org
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Subject: conf/19178: add reject routes and comments in /etc/rc.network6
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         19178
>Category:       conf
>Synopsis:       add reject routes and comments in /etc/rc.network6
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          wish
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jun 10 10:50:03 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Koji Kondo
>Release:        FreeBSD 4.0-STABLE
>Organization:
AboveNet Japan
>Environment:
FreeBSD aluminum.jp.above.net 4.0-STABLE FreeBSD 4.0-STABLE #0: Fri Jun  9 13:25:01 JST 2000     koji@aluminum.jp.above.net:/usr/src/sys/compile/ALUMINUM  i386

>Description:
We had better add rejects routes and comments.
We can see them from NetBSD, OpenBSD, and KAME.

>How-To-Repeat:
% diff -ur rc.network6.orig rc.network6
--- rc.network6.orig    Sun Jun 11 01:25:28 2000
+++ rc.network6 Sun Jun 11 01:50:09 2000
@@ -41,8 +41,39 @@
        # just to make sure
        ifconfig lo0 up
 
-       # disallow "internal" addresses to appear on the wire
+       # disallow site-local unicast dest without outgoing scope
+       # identifiers.
+       # If you configure site-locals without scope id (it is
+       # permissible config for routers that are not on scope
+       # boundary), you may want to comment the following one out.
+       #
+       route add -inet6 fec0:: -prefixlen 10 ::1 -reject
+
+       # disallow "internal" addresses to appear on the wire.
+       #
        route add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject
+
+       # disallow packets to malicious IPv4 compatible prefix
+       #
+       route add -inet6 ::224.0.0.0 -prefixlen 100 ::1 -reject
+       route add -inet6 ::127.0.0.0 -prefixlen 104 ::1 -reject
+       route add -inet6 ::0.0.0.0 -prefixlen 104 ::1 -reject
+       route add -inet6 ::255.0.0.0 -prefixlen 104 ::1 -reject
+
+       # Completely disallow packets to IPv4 compatible prefix.
+       # This may conflict with RFC1933 under following circumstances:
+       # (1) An IPv6-only KAME node tries to originate packets to IPv4
+       #     comatible destination.  The KAME node has no IPv4
+       #     compatible support.  Under RFC1933, it should transmit
+       #     native IPv6 packets toward IPv4 compatible destination,
+       #     hoping it would reach a router that forwards the packet
+       #     toward auto-tunnel interface.
+       # (2) An IPv6-only node originates a packet to IPv4 compatible
+       #     destination.  A KAME node is acting as an IPv6 router, and
+       #     asked to forward it.
+       # Due to rare use of IPv4 compatible address, and security
+       # issues with it, we disable it by default.
+       #
        route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject
 
        case ${ipv6_gateway_enable} in
@@ -271,9 +302,10 @@
                ifconfig stf0 inet6 2002:${ipv4_in_hexformat}:${stf_interface_ipv6_slaid:-0}:${stf_interface_ipv6_ifid} \
                        prefixlen ${stf_prefixlen}
                # disallow packets to malicious 6to4 prefix
-               route add -inet6 2002:7f00:0000:: -prefixlen 24 ::1 -reject
-               route add -inet6 2002:0000:0000:: -prefixlen 48 ::1 -reject
-               route add -inet6 2002:ffff:ffff:: -prefixlen 48 ::1 -reject
+               route add -inet6 2002:e000:: -prefixlen 20 ::1 -reject
+               route add -inet6 2002:7f00:: -prefixlen 24 ::1 -reject
+               route add -inet6 2002:0000:: -prefixlen 24 ::1 -reject
+               route add -inet6 2002:ff00:: -prefixlen 24 ::1 -reject
                ;;
        esac
 }

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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