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mptcp: set remote_deny_join_id0 on SYN recv

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[ Upstream commit 96939cec99 ]

When a SYN containing the 'C' flag (deny join id0) was received, this
piece of information was not propagated to the path-manager.

Even if this flag is mainly set on the server side, a client can also
tell the server it cannot try to establish new subflows to the client's
initial IP address and port. The server's PM should then record such
info when received, and before sending events about the new connection.

Fixes: df377be387 ("mptcp: add deny_join_id0 in mptcp_options_received")
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250912-net-mptcp-pm-uspace-deny_join_id0-v1-1-40171884ade8@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthieu Baerts (NGI0)
2025-09-12 14:52:20 +02:00
committed by Greg Kroah-Hartman
parent 9a95880208
commit 7f5b09cc84
1 changed files with 4 additions and 0 deletions
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4
net/mptcp/subflow.c
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@@ -888,6 +888,10 @@ create_child:
ctx->subflow_id = 1;
owner = mptcp_sk(ctx->conn);
if (mp_opt.deny_join_id0)
WRITE_ONCE(owner->pm.remote_deny_join_id0, true);
mptcp_pm_new_connection(owner, child, 1);
/* with OoO packets we can reach here without ingress