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mptcp: establish subflows from either end of connection

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This change updates internal logic to permit subflows to be
established from either the client or server ends of MPTCP
connections. This symmetry and added flexibility may be
harnessed by PM implementations running on either end in
creating new subflows.

The essence of this change lies in not relying on the
"server_side" flag (which continues to be available if needed).

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kishen Maloor
2022-05-02 13:52:35 -07:00
committed by Jakub Kicinski
parent d1ace2d9ab
commit 70c708e826
3 changed files with 8 additions and 7 deletions
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2
net/mptcp/options.c
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@@ -931,7 +931,7 @@ static bool check_fully_established(struct mptcp_sock *msk, struct sock *ssk,
if (TCP_SKB_CB(skb)->seq == subflow->ssn_offset + 1 &&
TCP_SKB_CB(skb)->end_seq == TCP_SKB_CB(skb)->seq &&
subflow->mp_join && (mp_opt->suboptions & OPTIONS_MPTCP_MPJ) &&
READ_ONCE(msk->pm.server_side))
!subflow->request_join)
tcp_send_ack(ssk);
goto fully_established;
}