Networking fixes for 5.18-rc8, including fixes from can, xfrm and

netfilter subtrees.

Notably this reverts a recent TCP/DCCP netns-related change
to address a possible UaF.

Current release - regressions:
  - tcp: revert "tcp/dccp: get rid of inet_twsk_purge()"

  - xfrm: set dst dev to blackhole_netdev instead of loopback_dev in ifdown

Previous releases - regressions:
  - netfilter: flowtable: fix TCP flow teardown

  - can: revert "can: m_can: pci: use custom bit timings for Elkhart Lake"

  - xfrm: check encryption module availability consistency

  - eth: vmxnet3: fix possible use-after-free bugs in vmxnet3_rq_alloc_rx_buf()

  - eth: mlx5: initialize flow steering during driver probe

  - eth: ice: fix crash when writing timestamp on RX rings

Previous releases - always broken:
  - mptcp: fix checksum byte order

  - eth: lan966x: fix assignment of the MAC address

  - eth: mlx5: remove HW-GRO from reported features

  - eth: ftgmac100: disable hardware checksum on AST2600

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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