ipv6: fix neighbour resolution with raw socket

[Kamal Mostafa]

Hi Nicholas-

These cherry-pick cleanly for our Disco 5.0 kernel and I'll submit
them into our pipeline for Disco.

But the second patch doesn't apply to Bionic 4.15 as ip6_dst_neigh_lookup()
is not present.  If you'd like to submit a backport for Bionic 4.15
(and Xenial 4.4?) we would be happy to consider it.

Thanks!

 -Kamal


On Tue, Aug 13, 2019 at 10:53:02AM +0200, Nicolas Dichtel wrote:
> Hi Ubuntu kernel team,
> 
> please, can you consider to cherry-pick the following linux upstream fixes:
> 9b1c1ef13b35 ("ipv6: constify rt6_nexthop()")
> 2c6b55f45d53 ("ipv6: fix neighbour resolution with raw socket")
> 
> They have been included in v5.2. The patch that introduces the bug has not been
> identified, but the bug is here since a long time (at least v4.4).
> 
> Here is the launchpad entry:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1834465
> 
> 
> Thank you,
> Nicolas
> 
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