Merge branch 'ipv4-less-uses-of-shared-ip-generator'

Eric Dumazet says:

====================
ipv4: less uses of shared IP generator

From: Eric Dumazet <edumazet@google.com>

We keep receiving research reports based on linux IPID generation.

Before breaking part of the Internet by switching to pure
random generator, this series reduces the need for the
shared IP generator for TCP sockets.
====================

Link: https://lore.kernel.org/r/20220127011022.1274803-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>