selftests: mptcp: add userspace pm fullmesh tests

This patch adds fullmesh selftests for userspace pm both on server side
and on client side. For the server side test, add two endpoints with
fullmesh flag on ns2, then signal an address on ns1 by userspace PM to
trigger the fullmesh connections. For the client side test, just use
userspace PM to create multiple subflows to do the fullmesh connections.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>

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

@@ -3459,6 +3459,46 @@ userspace_tests()
 		kill_events_pids
 		mptcp_lib_kill_wait $tests_pid
 	fi
+
+	# userspace pm server fullmesh
+	if reset_with_events "userspace pm server fullmesh" &&
+	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
+		set_userspace_pm $ns1
+		pm_nl_set_limits $ns2 5 5
+		pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow,fullmesh
+		pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow,fullmesh
+		speed=10 \
+			run_tests $ns1 $ns2 10.0.1.1 &
+		local tests_pid=$!
+		wait_mpj $ns1
+		userspace_pm_add_addr $ns1 10.0.2.1 10
+		chk_join_nr 4 4 4
+		chk_add_nr 1 1
+		chk_mptcp_info subflows 4 subflows 4
+		chk_subflows_total 5 5
+		chk_mptcp_info add_addr_signal 1 add_addr_accepted 1
+		kill_events_pids
+		mptcp_lib_kill_wait $tests_pid
+	fi
+
+	# userspace pm client fullmesh
+	if reset_with_events "userspace pm client fullmesh" &&
+	   continue_if mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
+		pm_nl_set_limits $ns1 5 5
+		set_userspace_pm $ns2
+		speed=10 \
+			run_tests $ns1 $ns2 10.0.1.1 &
+		local tests_pid=$!
+		wait_mpj $ns1
+		userspace_pm_add_sf $ns2 10.0.2.2 20
+		userspace_pm_add_sf $ns2 10.0.3.2 30
+		userspace_pm_add_sf $ns2 10.0.4.2 40
+		chk_join_nr 3 3 3
+		chk_mptcp_info subflows 3 subflows 3
+		chk_subflows_total 4 4
+		kill_events_pids
+		mptcp_lib_kill_wait $tests_pid
+	fi
 }
 
 endpoint_tests()