Merge branch 'inet-ping-misc-changes'

Eric Dumazet says:

====================
inet: ping: misc changes

First and third patches improve security a bit.

Second patch (ping_hash removal) is a cleanup.

Fourth patch uses EXPORT_IPV6_MOD[_GPL].
====================

Link: https://patch.msgid.link/20250829153054.474201-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>