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selftests: mptcp: join: test for prohibited MPC to port-based endp

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commit 5afca7e996 upstream.

Explicitly verify that MPC connection attempts towards a port-based
signal endpoint fail with a reset.

Note that this new test is a bit different from the other ones, not
using 'run_tests'. It is then needed to add the capture capability, and
the picking the right port which have been extracted into three new
helpers. The info about the capture can also be printed from a single
point, which simplifies the exit paths in do_transfer().

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: 1729cf186d ("mptcp: create the listening socket for new port")
Cc: stable@vger.kernel.org
Co-developed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20241014-net-mptcp-mpc-port-endp-v2-2-7faea8e6b6ae@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
[ Conflicts in mptcp_join.sh, because commit 0bd962dd86 ("selftests:
  mptcp: join: check CURRESTAB counters"), and commit 9e6a39ecb9
  ("selftests: mptcp: export TEST_COUNTER variable") are linked to new
  features, not available in this version. Resolving the conflicts is
  easy, simply adding the new helpers before do_transfer(), and rename
  MPTCP_LIB_TEST_COUNTER to TEST_COUNT that was used before. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Abeni 2024-10-18 17:57:38 +02:00 • committed by Greg Kroah-Hartman
commit ec0d0fcbd5
1 changed files with 85 additions and 30 deletions
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