Merge branch 'mptcp-Include-multiple-address-ids-in-RM_ADDR'

Mat Martineau says:

====================
mptcp: Include multiple address ids in RM_ADDR

Here's a patch series from the MPTCP tree that extends the capabilities
of the MPTCP RM_ADDR header.

MPTCP peers can exchange information about their IP addresses that are
available for additional MPTCP subflows. IP addresses are advertised
with an ADD_ADDR header type, and those advertisements are revoked with
the RM_ADDR header type. RFC 8684 allows the RM_ADDR header to include
more than one address ID, so multiple advertisements can be revoked in a
single header. Previous kernel versions have only used RM_ADDR with a
single address ID, so multiple removals required multiple packets.

Patches 1-4 plumb address id list structures around the MPTCP code,
where before only a single address ID was passed.

Patches 5-8 make use of the address lists at the path manager layer that
tracks available addresses for both peers.

Patches 9-11 update the selftests to cover the new use of RM_ADDR with
multiple address IDs.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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