[B.A.T.M.A.N.] bat0 looses IPv6 capabilities when inserting tinc-interface (BATMAN-Adv)

["Linus Lüssing" <linus.luessing@web.de>]

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I'm having a tinc-tunnel with the interface named 3micc
over the internet here which is in "switch-mode" (so every
tunneled package has a complete ethernet-frame which makes
batman-adv able to use this interface for OGMs).

When I'm doing the steps in the following order, then everything
works fine:
1) sudo modprobe batman-adv
2) sudo ifconfig bat0 up
3) su -c "echo 3micc > /proc/net/batman-adv/interfaces"

But when I'm switching the steps 2) and 3), so first adding the
interface and then putting bat0 up, then bat0 suddenly looses its
IPv6 link-local addresse. /proc/sys/net/ipv6/conf/bat0 vanished
(but ipv4/conf/bat0 is still there). When I'm trying to add an
IPv6-address manually with "sudo ip -6 addr add
fe80::2ff:e3ff:fe85:b9ca/64 dev bat0" then I get the response
"RTNETLINK answers: No buffer space available". But dmesg shows
no errors. This problem is reproducable, I've been doing a sudo
modprobe -r batman-adv a couple of times and repeating the steps
stated above.

I'm running batman-adv-modules-2.6.26-2-486 version
0.1-7+2.6.26-15 on Debian unstable with the same kernel-version.

Cheers, Linus

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