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mptcp: subflow: check parent mptcp socket on subflow state change

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This is needed at least until proper MPTCP-Level fin/reset
signalling gets added:

We wake parent when a subflow changes, but we should do this only
when all subflows have closed, not just one.

Schedule the mptcp worker and tell it to check eof state on all
subflows.

Only flag mptcp socket as closed and wake userspace processes blocking
in poll if all subflows have closed.

Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal
2020-04-02 13:44:52 +02:00
committed by David S. Miller
parent 0b4f33def7
commit 59832e2465
3 changed files with 36 additions and 2 deletions
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3
net/mptcp/subflow.c
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@@ -994,8 +994,7 @@ static void subflow_state_change(struct sock *sk)
if (!(parent->sk_shutdown & RCV_SHUTDOWN) &&
!subflow->rx_eof && subflow_is_done(sk)) {
subflow->rx_eof = 1;
parent->sk_shutdown |= RCV_SHUTDOWN;
__subflow_state_change(parent);
mptcp_subflow_eof(parent);
}
}