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| author | Matthieu Baerts (NGI0) <matttbe@kernel.org> | 2025-09-12 14:52:20 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-09-15 18:12:05 -0700 |
| commit | 96939cec994070aa5df852c10fad5fc303a97ea3 (patch) | |
| tree | 82b6184eedaeb4cfd7dfec0e9388449f033ba198 | |
| parent | Merge branch 'selftests-mptcp-avoid-spurious-errors-on-tcp-disconnect' (diff) | |
| download | linux-96939cec994070aa5df852c10fad5fc303a97ea3.tar.gz linux-96939cec994070aa5df852c10fad5fc303a97ea3.zip | |
mptcp: set remote_deny_join_id0 on SYN recv
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: df377be38725 ("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>
| -rw-r--r-- | net/mptcp/subflow.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 3f1b62a9fe88..f31a3a79531a 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -883,6 +883,10 @@ 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 |