bird 1.6 seems to ignore ipv6 kernel routes on 4.19

[Ondrej Zajicek]

On Wed, Aug 21, 2019 at 02:35:13PM +0100, Tom Bird wrote:
> Hi,
> 
> I recently updated some virtual machine hosting nodes to Debian Buster from
> Stretch, and I'm having an interesting problem with IPv6 kernel routes.  My
> example uses 1.6.6 but 1.6.7 shows the same behaviour, so I'm just wondering
> what I am missing.  v4 is all working as expected.

Hi

It seems that it is related to adding routes using 'route' command instead of
'ip route' command.

# ip r a 2001:db8:1:14::/64 via 2001:db8:1:1::14
# route -6 add 2001:db8:1:15::/64 gw 2001:db8:1:1::15
# ip r a 2001:db8:1:16::/64 via 2001:db8:1:1::16 metric 1

# ip -6 r l
...
2001:db8:1:14::/64 via 2001:db8:1:1::14 dev ve0 metric 1024 pref medium
none 2001:db8:1:15::/64 via 2001:db8:1:1::15 dev ve0 metric 1 pref medium
2001:db8:1:16::/64 via 2001:db8:1:1::16 dev ve0 metric 1 pref medium
...

bird> show route protocol kernel1
2001:db8:1:14::/64 via 2001:db8:1:1::14 on ve0 [kernel1 17:39:42] * (10)
2001:db8:1:16::/64 via 2001:db8:1:1::16 on ve0 [kernel1 17:42:50] * (10)


Note the 'none' in route added by 'route' command. Perhaps such route has
some strange attribute and that is why it is ignored by BIRD.


> I tried a bird6.conf from a machine still running Debian Stretch, and that
> also did not import the kernel routes.
> 
> I've tried this on a test VM with bird 1.6.3 and kernel 4.9.0 and it imports
> the routes as expected.

Perhaps it may be difference in in kernel version? Different traslation of
old route API calls?

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
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"To err is human -- to blame it on a computer is even more so."