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commit008385efd0upstream. The previous commit adds an exception for the C-flag case. The 'mptcp_join.sh' selftest is extended to validate this case. In this subtest, there is a typical CDN deployment with a client where MPTCP endpoints have been 'automatically' configured: - the server set net.mptcp.allow_join_initial_addr_port=0 - the client has multiple 'subflow' endpoints, and the default limits: not accepting ADD_ADDRs. Without the parent patch, the client is not able to establish new subflows using its 'subflow' endpoints. The parent commit fixes that. The 'Fixes' tag here below is the same as the one from the previous commit: this patch here is not fixing anything wrong in the selftests, but it validates the previous fix for an issue introduced by this commit ID. Fixes:df377be387("mptcp: add deny_join_id0 in mptcp_options_received") Cc: stable@vger.kernel.org Reviewed-by: Geliang Tang <geliang@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20250925-net-next-mptcp-c-flag-laminar-v1-2-ad126cc47c6b@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.