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-rw-r--r--Documentation/networking/mptcp-sysctl.rst13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/networking/mptcp-sysctl.rst b/Documentation/networking/mptcp-sysctl.rst
index ee06fd782465a..76d939e688b84 100644
--- a/Documentation/networking/mptcp-sysctl.rst
+++ b/Documentation/networking/mptcp-sysctl.rst
@@ -32,3 +32,16 @@ checksum_enabled - BOOLEAN
per-namespace sysctl.
Default: 0
+
+allow_join_initial_addr_port - BOOLEAN
+ Allow peers to send join requests to the IP address and port number used
+ by the initial subflow if the value is 1. This controls a flag that is
+ sent to the peer at connection time, and whether such join requests are
+ accepted or denied.
+
+ Joins to addresses advertised with ADD_ADDR are not affected by this
+ value.
+
+ This is a per-namespace sysctl.
+
+ Default: 1