From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: [Bugme-new] [Bug 14839] New: Trying to use a TUN device fir IPv6 traffic, cannot set destination address. Date: Tue, 22 Dec 2009 15:12:38 -0800 Message-ID: <20091222151238.e7e44e36.akpm@linux-foundation.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: bugzilla-daemon@bugzilla.kernel.org, bugme-daemon@bugzilla.kernel.org, mcisho@yahoo.com To: netdev@vger.kernel.org, Maxim Krasnyansky Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:59524 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752792AbZLVXNa (ORCPT ); Tue, 22 Dec 2009 18:13:30 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Sat, 19 Dec 2009 10:35:18 GMT bugzilla-daemon@bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=14839 > > Summary: Trying to use a TUN device fir IPv6 traffic, cannot > set destination address. > Product: Networking > Version: 2.5 > Kernel Version: 2.6.31.6 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: IPV6 > AssignedTo: yoshfuji@linux-ipv6.org > ReportedBy: mcisho@yahoo.com > Regression: No > > > I am modifying a program that uses a TUN device for IPv4 traffic so that the > same TUN device can also be used for IPv6 traffic. Using ioctl SIOCSIFADDR will > add an IPv6 address but ioctl SIOCSDSTADDR to add an IPv6 destination address > always results in error ENODEV (19 No such device). > > I searched around the source and found addrconf_set_dstaddr in addrconf.c which > seems to be the routine called to set the destination address. However, the > routine only sets a destination address for a SIT device, otherwise if returns > ENODEV. > > Below is the ifconfig output for the TUN device:- > $ ifconfig tun3 > tun3 Link encap:UNSPEC HWaddr > 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 > inet addr:192.168.3.235 P-t-P:192.168.250.235 Mask:255.255.255.255 > inet6 addr: fd00::3:235/128 Scope:Global > UP POINTOPOINT RUNNING MTU:1344 Metric:1 > RX packets:0 errors:0 dropped:0 overruns:0 frame:0 > TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 > collisions:0 txqueuelen:500 > RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) > > BTW, ifconfig cannot add an IPv6 destination address either, the code has a > comment saying that the support needs to be written. > > Can a TUN device be used for IPv6 traffic? I cannot find a definitive answer, > only 'should'. Or is that nobody has ever wanted to use a TUN device for IPv6 > traffic, and so the kernel support has not been written? Or am I doing > something wrong? >