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Message-Id: <200411081432.iA8EW4oe055374@www.freebsd.org>
Date: Mon, 8 Nov 2004 14:32:04 GMT
From: andrea <markkram@tin.it>
To: freebsd-gnats-submit@FreeBSD.org
Subject: ifconfig tun0 destroy report: ifconfig: SIOCIFDESTROY: Invalid argument
X-Send-Pr-Version: www-2.3

>Number:         73673
>Category:       kern
>Synopsis:       [if_tun] ifconfig tun0 destroy report: ifconfig: SIOCIFDESTROY: Invalid argument
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Nov 08 14:40:19 GMT 2004
>Closed-Date:    Sun Oct 30 16:41:33 GMT 2005
>Last-Modified:  Thu Dec  8 02:20:04 UTC 2011
>Originator:     andrea
>Release:        5.3 RC1
>Organization:
tin.it
>Environment:
FreeBSD ihi.systems303.it 5.3-RC1 FreeBSD 5.3-RC1 #0: Thu Oct 28 20:03:22 CEST 2004     root@ihi.systems303.it:/usr/obj/usr/src/sys/IHI  i386

>Description:
I use a vpn client that configure the tun0 interface when the vpn is up.
When the vpn go down the interface tun0 remain configured, if the command
'ifconfig tun0 destroy' return:

ifconfig: SIOCIFDESTROY: Invalid argument

>How-To-Repeat:
 
>Fix:

>Release-Note:
>Audit-Trail:
Adding to audit trail from email posted to freebsd-bugs on 7/7/2005:

From: David LeCount <snailboy1@yahoo.com>

I request that this bug be moved from non-serious to
serious. The only way to clear tun0 is to start ppp
and then kill it which makes using ipv6-over-udp (and
probably other protocols) a severe pain, limiting functionality.
Responsible-Changed-From-To: freebsd-i386->freebsd-bugs 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Fri Jul 8 03:11:03 GMT 2005 
Responsible-Changed-Why:  
This does not sound i386-specific. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=73673 
State-Changed-From-To: open->closed 
State-Changed-By: brooks 
State-Changed-When: Sun Oct 30 16:38:34 GMT 2005 
State-Changed-Why:  
This is not a bug.  tun(4) devices do not support the interface cloning 
API and thus the ifconfig destory command is invalid.  If you want 
to clear the interface state "ifconfig tun0 down delete" should do 
it.  If there's another issue here, please explain it and the PR 
can be reopened with a correct subject. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=73673 

From: "Maxim P. Kondakov" <maxx@bds.ru>
To: bug-followup@freebsd.org
Cc:  
Subject: Re: kern/73673: [if_tun] ifconfig tun0 destroy report: ifconfig: SIOCIFDESTROY: Invalid argument
Date: Thu, 17 Nov 2005 09:49:22 +0200

 I have got the same problem.
 I have added a ip-in-ip interface by the following command:
 
 nos-tun -t /dev/tun3 -s 192.168.0.2 -d 192.168.0.1 -p 4 10.0.0.156
 
 in the interface list I see this interface and it works fine,
 
 tun3: flags=8050<POINTOPOINT,RUNNING,MULTICAST> mtu 1500
         inet 192.168.0.2 --> 192.168.0.1 netmask 0xffffffff
         Opened by PID 4368
 
 but when I want to delete this interface by the "ifconfig tun3 down delete" I 
 see it again in ifconfig! And I can't destroy it:
 
 #ifconfig
 tun3: flags=8050<POINTOPOINT,RUNNING,MULTICAST> mtu 1500
         Opened by PID 4368
 
 #sudo ifconfig tun1 destroy
 ifconfig: SIOCIFDESTROY: Invalid argument
 
 It disapears only after reboot.
 
 -- 
 Maxim Kondakov

From: linimon@lonesome.com (Mark Linimon)
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/73673: [if_tun] ifconfig tun0 destroy report: ifconfig: SIOCIFDESTROY: Invalid argument
Date: Thu, 17 Nov 2005 14:24:17 -0600

 Adding to audit trail from posting to freebsd-bugs:
 
 On Thu, Nov 17, 2005 at 09:09:16AM -0800, Brooks Davis wrote:
 > As I said previously this is not a bug.  It would be better if tun was
 > an if_clone device, but it isn't so there's no way to get rid of
 > its interfaces.  That's entirely valid behavior.
 > 
 > -- Brooks

From: David Woodhouse <dwmw2@infradead.org>
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/73673: [if_tun] ifconfig tun0 destroy report: ifconfig:
 SIOCIFDESTROY: Invalid argument
Date: Thu, 08 Dec 2011 02:11:59 +0000

 --=-ylIIl0FMV/Ccnsos+yT1
 Content-Type: text/plain; charset="UTF-8"
 Content-Transfer-Encoding: quoted-printable
 
 In vpnc-script (as used by vpnc and openconnect VPN clients), we have
 'ifconfig $TUNDEV destroy' for FreeBSD and NetBSD.
 
 My testing on FreeBSD shows that this seems to hang, *not* give the
 -EINVAL error as described here. It hangs until the VPN program has
 actually closed its open file handle to the tun device.
 
 In practice, since the VPN program spawns vpnc-script to shut down the
 routing &c *before* closing the tun device, this deadlocks.
 
 Simply removing the 'ifconfig $TUNDEV destroy' seems to leave a stale
 device lying around. Running it *later* does appear to work, and cleans
 up the unwanted device.
 
 I note that this bug is fairly old; is 'ifconfig $TUNDEV destroy' now
 expected to work... and is it expected to hang in this situation?
 
 FreeBSD freebsd.infradead.org 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu
 Feb 17 02:41:51 UTC 2011
 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
 
 
 --=20
 dwmw2
 
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 --=-ylIIl0FMV/Ccnsos+yT1--
 
>Unformatted:
