selftests: mptcp: join: validate C-flag + def limit

JIRA: https://issues.redhat.com/browse/RHEL-115576
Upstream Status: net-next.git commit 008385e

commit 008385e
Author: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Date:   Thu Sep 25 12:32:37 2025 +0200

    selftests: mptcp: join: validate C-flag + def limit

    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: df377be ("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: Davide Caratti <dcaratti@redhat.com>

Author: dcaratti

tools/testing/selftests/net/mptcp/mptcp_join.sh

@@ -3178,6 +3178,17 @@ deny_join_id0_tests()
 		run_tests $ns1 $ns2 10.0.1.1
 		chk_join_nr 1 1 1
 	fi
+
+	# default limits, server deny join id 0 + signal
+	if reset_with_allow_join_id0 "default limits, server deny join id 0" 0 1; then
+		pm_nl_set_limits $ns1 0 2
+		pm_nl_set_limits $ns2 0 2
+		pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
+		pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
+		pm_nl_add_endpoint $ns2 10.0.4.2 flags subflow
+		run_tests $ns1 $ns2 10.0.1.1
+		chk_join_nr 2 2 2
+	fi
 }
 
 fullmesh_tests()