Date: Tue, 11 Jul 2006 11:01:41 GMT From: Remi Denis-Courmont <rdenis@simphalempin.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/100080: tun(4) device close removes only IPv4 addresses and routes Message-ID: <200607111101.k6BB1fOR034918@www.freebsd.org> Resent-Message-ID: <200607111110.k6BBAE62061744@freefall.freebsd.org>
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>Number: 100080 >Category: kern >Synopsis: tun(4) device close removes only IPv4 addresses and routes >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Jul 11 11:10:14 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Remi Denis-Courmont >Release: 6.1 >Organization: >Environment: FreeBSD fbsd 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Sun May 7 04:32:43 UTC 2006 root@opus.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386 >Description: The userland layer-3 tunnel character device tun(4) "/dev/tun" should remove all addresses and routes through an allocated network interface whenever the file descriptor is closed (src/sys/net/if_tun.c:tunclose). However, it currently seems to only remove IPv4 (AF_INET) addresses and routes, leaving dangling routes in the network stack when IPv6 is used. >How-To-Repeat: This problem is known to trigger when running Miredo 0.8.5 in Teredo relay mode. At first run, the program works fine, but if it is stopped/killed or crashes, we get a dangling route on the leftover tunnel device; restarting the program will then fail with EEXIST as it tries to add the same route to a new tunnel interface. Sample configuration (/usr/local/etc/miredo.conf) would be the following one-liner: RelayType cone Unfortunately, setting this up in non-trivial since said software is not in the ports tree. Sources are there: http://www.remlab.net/files/miredo/v0.8/ Other tunnel software using tun + IPv6 might also be affected. >Fix: Supposedly yemove the AF_INET check in tunclose() from src/sys/net/if_tun.c or add a check for all supported addresses family, including but maybe not limited to AF_INET6. >Release-Note: >Audit-Trail: >Unformatted:
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