netdev - Re: Auto generation of IPv6 link local address

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Date:	Tue, 10 Aug 2010 04:32:23 +0000
From:	Michał Mirosław <mirqus@...il.com>
To:	Jon Smirl <jonsmirl@...il.com>
Cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: Auto generation of IPv6 link local address

2010/8/10 Jon Smirl <jonsmirl@...il.com>:
> When I bring my Ethernet interface up it automatically gets a link
> local IPv6 address.
>
> eth3      Link encap:Ethernet  HWaddr 00:1b:21:59:65:32
>          inet addr:192.168.1.8  Bcast:192.168.1.255  Mask:255.255.255.0
>          inet6 addr: fe80::21b:21ff:fe59:6532/64 Scope:Link  -->
> Missing from my driver
>          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>          RX packets:1836635 errors:0 dropped:0 overruns:0 frame:0
>          TX packets:1283010 errors:0 dropped:0 overruns:0 carrier:0
>          collisions:0 txqueuelen:1000
>          RX bytes:2259859914 (2.2 GB)  TX bytes:121836850 (121.8 MB)
>          Interrupt:16 Memory:dbd60000-dbd80000
>
> I'm writing a device driver for new 802.15.4 hardware. When I bring it
> up I don't get an automatic IPv6 link local address. What controls
> whether an adapter gets a link local address added or not? My driver
> should get one so I must have something wrong in my code.
>
> wpan0     Link encap:IEEE 802.15.4  HWaddr 00:50:c2:ff:fe:a8:a8:c5
>          UP BROADCAST RUNNING NOARP  MTU:1280  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:10
>          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

addrconf_notify() in linux-2.6.34/net/ipv6/addrconf.c does not have
code for IEEE 802.15.4. I don't know much about 802.15.4, but if IPv6
with static addresses works over it, then adding support for
autogenerated addresses should be easy (just addrconf_dev_config() and
ipv6_generate_eui64()?).

Best Regards,
Michał Mirosław
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