[PATCH] networking: [IPv6] Don't generate temporary for TUN devices

[PATCH] networking: [IPv6] Don't generate temporary for TUN devices

[Rémi Denis-Courmont]

	Hello,

Userland layer-2 tunneling devices allocated through the TUNTAP driver 
(drivers/net/tun.c) have a type of ARPHRD_NONE, and have no link-layer 
address. The kernel complains at regular interval when IPv6 Privacy 
extension are enabled because it can't find an hardware address :

Dec 29 11:02:04 auguste kernel: __ipv6_regen_rndid(idev=cb3e0c00): 
cannot get EUI64 identifier; use random bytes.

IPv6 Privacy extensions should probably be disabled on that sort of 
device. They won't work anyway. If userland wants a more usual 
Ethernet-ish interface with usual IPv6 autoconfiguration, it will use a 
TAP device with an emulated link-layer  and a random hardware address 
rather than a TUN device.

As far as I could fine, TUN virtual device from TUNTAP is the very only 
sort of device using ARPHRD_NONE as kernel device type.


Signed-off-by: Rémi Denis-Courmont <rdenis@simphalempin.com>
--- a/net/ipv6/addrconf.c.orig	2004-12-29 10:50:27.000000000 +0100
+++ b/net/ipv6/addrconf.c	2004-12-29 10:50:41.000000000 +0100
@@ -372,6 +372,7 @@
 		ndev->regen_timer.data = (unsigned long) ndev;
 		if ((dev->flags&IFF_LOOPBACK) ||
 		    dev->type == ARPHRD_TUNNEL ||
+		    dev->type == ARPHRD_NONE ||
 		    dev->type == ARPHRD_SIT) {
 			printk(KERN_INFO
 				"Disabled Privacy Extensions on device %p(%s)\n",

-- 
Rémi Denis-Courmont
http://www.simphalempin.com/home/

Re: [PATCH] networking: [IPv6] Don't generate temporary for TUN devices

[YOSHIFUJI Hideaki / 吉藤英明]

In article <200506111512.42592.rdenis@simphalempin.com> (at Sat, 11 Jun 2005 15:12:40 +0200), Rémi Denis-Courmont <rdenis@simphalempin.com> says:

> Dec 29 11:02:04 auguste kernel: __ipv6_regen_rndid(idev=cb3e0c00): 
> cannot get EUI64 identifier; use random bytes.
:
> As far as I could fine, TUN virtual device from TUNTAP is the very only 
> sort of device using ARPHRD_NONE as kernel device type.

Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

--yoshfuji