Merge branch 'neighbour-add-ipv4-ipv6-specific-wrappers-for-neigh_lookup-and-friends'

Kuniyuki Iwashima says:

====================
neighbour: Add IPv4/IPv6-specific wrappers for neigh_lookup() and friends.

syzbot reported that ip6_finish_output2() could pass tbl and dev
from different netns to neigh_create().

When namespacifying neigh_table, I chose to resolve neigh_table
in callers to minimise changes, but it turned out to be error-prone.

This series adds IPv4/IPv6-specific helpers for neigh_lookup()
and neigh_create() that always fetch the netns from dev to fix
the problem.

Along the way, the confusing and now mostly redundant helpers
__neigh_lookup() and __neigh_lookup_errno() are converted and
removed.
====================

Link: https://patch.msgid.link/20261003212336.1304988-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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