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doc: tls: socket needs to be established to enable ulp

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To enable TLS ulp socket needs to be in established state.
This was added in commit d91c3e17f7 ("net/tls: Only attach
to sockets in ESTABLISHED state"), in 2018.

Signed-off-by: Ulrich Weber <ulrich.weber@gmail.com>
Link: https://patch.msgid.link/20250626145618.15464-1-ulrich.weber@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ulrich Weber 2025-06-26 16:56:18 +02:00 • committed by Jakub Kicinski
parent 6e457732c8
commit ba2f83eecd
1 changed files with 3 additions and 1 deletions
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4
Documentation/networking/tls.rst
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@ -16,11 +16,13 @@ User interface
Creating a TLS connection
-------------------------
First create a new TCP socket and set the TLS ULP.
First create a new TCP socket and once the connection is established set the
TLS ULP.
.. code-block:: c
sock = socket(AF_INET, SOCK_STREAM, 0);
connect(sock, addr, addrlen);
setsockopt(sock, SOL_TCP, TCP_ULP, "tls", sizeof("tls"));
Setting the TLS ULP allows us to set/get TLS socket options. Currently