From: David Ahern <dsah...@gmail.com>
Date: Tue, 21 Nov 2017 07:08:57 -0800
> Florian reported a breakage with anycast routes due to commit
> 4832c30d5458 ("net: ipv6: put host and anycast routes on device with
> address"). Prior to this commit anycast routes were added against the
> loopback device causing repetitive route entries with no insight into
> why they existed. e.g.:
> $ ip -6 ro ls table local type anycast
> anycast 2001:db8:1:: dev lo proto kernel metric 0 pref medium
> anycast 2001:db8:2:: dev lo proto kernel metric 0 pref medium
> anycast fe80:: dev lo proto kernel metric 0 pref medium
> anycast fe80:: dev lo proto kernel metric 0 pref medium
>
> The point of commit 4832c30d5458 is to add the routes using the device
> with the address which is causing the route to be added. e.g.,:
> $ ip -6 ro ls table local type anycast
> anycast 2001:db8:1:: dev eth1 proto kernel metric 0 pref medium
> anycast 2001:db8:2:: dev eth2 proto kernel metric 0 pref medium
> anycast fe80:: dev eth2 proto kernel metric 0 pref medium
> anycast fe80:: dev eth1 proto kernel metric 0 pref medium
>
> For traffic to work as it did before, the dst device needs to be switched
> to the loopback when the copy is created similar to local routes.
>
> Fixes: 4832c30d5458 ("net: ipv6: put host and anycast routes on device with
> address")
> Signed-off-by: David Ahern <dsah...@gmail.com>
Applied and queued up for -stable, thanks!
