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mptcp: update per unacked sequence on pkt reception

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So that we keep per unacked sequence number consistent; since
we update per msk data, use an atomic64 cmpxchg() to protect
against concurrent updates from multiple subflows.

Initialize the snd_una at connect()/accept() time.

Co-developed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni
2020-03-27 14:48:42 -07:00
committed by David S. Miller
parent 926bdeab55
commit cc9d256698
3 changed files with 49 additions and 6 deletions
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2
net/mptcp/protocol.c
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@@ -906,6 +906,7 @@ struct sock *mptcp_sk_clone(const struct sock *sk, struct request_sock *req)
}
msk->write_seq = subflow_req->idsn + 1;
atomic64_set(&msk->snd_una, msk->write_seq);
if (subflow_req->remote_key_valid) {
msk->can_ack = true;
msk->remote_key = subflow_req->remote_key;
@@ -1107,6 +1108,7 @@ void mptcp_finish_connect(struct sock *ssk)
WRITE_ONCE(msk->write_seq, subflow->idsn + 1);
WRITE_ONCE(msk->ack_seq, ack_seq);
WRITE_ONCE(msk->can_ack, 1);
atomic64_set(&msk->snd_una, msk->write_seq);
mptcp_pm_new_connection(msk, 0);
}