selftests: mptcp: add fullmesh env var

Use a new env var fullmesh instead of passing 'fullmesh_*' to addr_nr_ns2.
It can be set with the actual value of addr_nr_ns2 now:

  addr_nr_ns2=fullmesh_1 \
          run_tests $ns1 $ns2 10.0.1.1

  ->

  fullmesh=1 \
          run_tests $ns1 $ns2 10.0.1.1.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Link: https://lore.kernel.org/r/20230712-upstream-net-next-20230712-selftests-mptcp-use-local-env-v1-3-f1c8b62fbf95@tessares.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -56,6 +56,7 @@ unset addr_nr_ns1
 unset addr_nr_ns2
 unset sflags
 unset fastclose
+unset fullmesh
 
 # generated using "nfbpf_compile '(ip && (ip[54] & 0xf0) == 0x30) ||
 #				  (ip6 && (ip6[74] & 0xf0) == 0x30)'"
@@ -832,11 +833,12 @@ pm_nl_set_endpoint()
 	local addr_nr_ns1=${addr_nr_ns1:-0}
 	local addr_nr_ns2=${addr_nr_ns2:-0}
 	local sflags=${sflags:-""}
+	local fullmesh=${fullmesh:-""}
 
 	local flags="subflow"
-	if [[ "${addr_nr_ns2}" = "fullmesh_"* ]]; then
+	if [ -n "${fullmesh}" ]; then
 		flags="${flags},fullmesh"
-		addr_nr_ns2=${addr_nr_ns2:9}
+		addr_nr_ns2=${fullmesh}
 	fi
 
 	# let the mptcp subflow be established in background before
@@ -2689,7 +2691,7 @@ mixed_tests()
 		pm_nl_set_limits $ns2 2 4
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
 		pm_nl_add_endpoint $ns1 dead:beef:2::1 flags signal
-		addr_nr_ns2=fullmesh_1 \
+		fullmesh=1 \
 			run_tests $ns1 $ns2 dead:beef:1::1 slow
 		chk_join_nr 4 4 4
 	fi
@@ -3102,7 +3104,7 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 1 3
 		pm_nl_set_limits $ns2 1 3
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
-		addr_nr_ns2=fullmesh_1 \
+		fullmesh=1 \
 			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 3 3 3
 		chk_add_nr 1 1
@@ -3115,7 +3117,7 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 2 5
 		pm_nl_set_limits $ns2 1 5
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
-		addr_nr_ns2=fullmesh_2 \
+		fullmesh=2 \
 			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 5 5 5
 		chk_add_nr 1 1
@@ -3129,7 +3131,7 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 2 4
 		pm_nl_set_limits $ns2 1 4
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
-		addr_nr_ns2=fullmesh_2 \
+		fullmesh=2 \
 			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 4 4 4
 		chk_add_nr 1 1
@@ -3153,7 +3155,7 @@ fullmesh_tests()
 		pm_nl_set_limits $ns1 4 4
 		pm_nl_add_endpoint $ns1 10.0.2.1 flags subflow,fullmesh
 		pm_nl_set_limits $ns2 4 4
-		addr_nr_ns2=fullmesh_1 sflags=nofullmesh \
+		fullmesh=1 sflags=nofullmesh \
 			run_tests $ns1 $ns2 10.0.1.1 slow
 		chk_join_nr 2 2 2
 		chk_rm_nr 0 1