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H A Dprotocol.cdiff 1954b86016cf8522970e1b7aba801233d777ec47 Fri Feb 28 17:47:39 CST 2020 Mat Martineau <mathew.j.martineau@linux.intel.com> mptcp: Check connection state before attempting send

MPTCP should wait for an active connection or skip sending depending on
the connection state, as TCP does. This happens before the possible
passthrough to a regular TCP sendmsg because the subflow's socket type
(MPTCP or TCP fallback) is not known until the connection is
complete. This is also relevent at disconnect time, where data should
not be sent in certain MPTCP-level connection states.

Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>