netdev - [RFC] Backporting "add second dif to raw, inet{6,}, udp, multicast sockets" to LTS 4.9

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Date:   Fri, 3 Jun 2022 22:08:22 +0200
From:   Petr Vorel <pvorel@...e.cz>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [RFC] Backporting "add second dif to raw, inet{6,}, udp, multicast
 sockets" to LTS 4.9

Hi all,

David (both), would it be possible to backport your commits from merge
9bcb5a572fd6 ("Merge branch 'net-l3mdev-Support-for-sockets-bound-to-enslaved-device'")
from v4.14-rc1 to LTS 4.9?

These commits added second dif to raw, inet{6,}, udp, multicast sockets.
The change is not a fix but a feature - significant change, therefore I
understand if you're aginast backporting it.

My motivation is to get backported to LTS 4.9 these fixes from v5.17 (which
has been backported to all newer stable/LTS trees):
2afc3b5a31f9 ("ping: fix the sk_bound_dev_if match in ping_lookup")
35a79e64de29 ("ping: fix the dif and sdif check in ping_lookup")
cd33bdcbead8 ("ping: remove pr_err from ping_lookup")

which fix small issue with IPv6 in ICMP datagram socket ("ping" socket).

These 3 commits depend on 9bcb5a572fd6, particularly on:
3fa6f616a7a4d ("net: ipv4: add second dif to inet socket lookups")
4297a0ef08572 ("net: ipv6: add second dif to inet6 socket lookups")

Kind regards,
Petr