Merge branch 'mptcp-userspace-pm-create-sockets-for-the-right-family'

Matthieu Baerts says:

====================
mptcp: userspace pm: create sockets for the right family

Before these patches, the Userspace Path Manager would allow the
creation of subflows with wrong families: taking the one of the MPTCP
socket instead of the provided ones and resulting in the creation of
subflows with likely not the right source and/or destination IPs. It
would also allow the creation of subflows between different families or
not respecting v4/v6-only socket attributes.

Patch 1 lets the userspace PM select the proper family to avoid creating
subflows with the wrong source and/or destination addresses because the
family is not the expected one.

Patch 2 makes sure the userspace PM doesn't allow the userspace to
create subflows for a family that is not allowed.

Patch 3 validates scenarios with a mix of v4 and v6 subflows for the
same MPTCP connection.

These patches fix issues introduced in v5.19 when the userspace path
manager has been introduced.
====================

Link: https://lore.kernel.org/r/20230112-upstream-net-20230112-netlink-v4-v6-v1-0-6a8363a221d2@tessares.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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