selftests: mptcp: functional tests for the userspace PM type

This change adds a selftest script that performs a comprehensive
behavioral/functional test of all userspace PM capabilities by exercising
all the newly added APIs and changes to support said capabilities.
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+ip -Version > /dev/null 2>&1
+if [ $? -ne 0 ];then
+	echo "SKIP: Cannot not run test without ip tool"
+	exit 1
+fi
+
+ANNOUNCED=6        # MPTCP_EVENT_ANNOUNCED
+REMOVED=7          # MPTCP_EVENT_REMOVED
+SUB_ESTABLISHED=10 # MPTCP_EVENT_SUB_ESTABLISHED
+SUB_CLOSED=11      # MPTCP_EVENT_SUB_CLOSED
+
+AF_INET=2
+AF_INET6=10
+
+evts_pid=0
+client4_pid=0
+server4_pid=0
+client6_pid=0
+server6_pid=0
+client4_token=""
+server4_token=""
+client6_token=""
+server6_token=""
+client4_port=0;
+client6_port=0;
+app4_port=50002
+new4_port=50003
+app6_port=50004
+client_addr_id=${RANDOM:0:2}
+server_addr_id=${RANDOM:0:2}
+
+sec=$(date +%s)
+rndh=$(stdbuf -o0 -e0 printf %x "$sec")-$(mktemp -u XXXXXX)
+ns1="ns1-$rndh"
+ns2="ns2-$rndh"
+
+cleanup()
+{
+	echo "cleanup"
+
+	rm -rf $file
+
+	# Terminate the MPTCP connection and related processes
+	if [ $client4_pid -ne 0 ]; then
+		kill -SIGUSR1 $client4_pid > /dev/null 2>&1
+	fi
+	if [ $server4_pid -ne 0 ]; then
+		kill $server4_pid > /dev/null 2>&1
+	fi
+	if [ $client6_pid -ne 0 ]; then
+		kill -SIGUSR1 $client6_pid > /dev/null 2>&1
+	fi
+	if [ $server6_pid -ne 0 ]; then
+		kill $server6_pid > /dev/null 2>&1
+	fi
+	if [ $evts_pid -ne 0 ]; then
+		kill $evts_pid > /dev/null 2>&1
+	fi
+	local netns
+	for netns in "$ns1" "$ns2" ;do
+		ip netns del "$netns"
+	done
+}
+
+trap cleanup EXIT
+
+# Create and configure network namespaces for testing
+for i in "$ns1" "$ns2" ;do
+	ip netns add "$i" || exit 1
+	ip -net "$i" link set lo up
+	ip netns exec "$i" sysctl -q net.mptcp.enabled=1
+	ip netns exec "$i" sysctl -q net.mptcp.pm_type=1
+done
+
+#  "$ns1"              ns2
+#     ns1eth2    ns2eth1
+
+ip link add ns1eth2 netns "$ns1" type veth peer name ns2eth1 netns "$ns2"
+
+# Add IPv4/v6 addresses to the namespaces
+ip -net "$ns1" addr add 10.0.1.1/24 dev ns1eth2
+ip -net "$ns1" addr add 10.0.2.1/24 dev ns1eth2
+ip -net "$ns1" addr add dead:beef:1::1/64 dev ns1eth2 nodad
+ip -net "$ns1" addr add dead:beef:2::1/64 dev ns1eth2 nodad
+ip -net "$ns1" link set ns1eth2 up
+
+ip -net "$ns2" addr add 10.0.1.2/24 dev ns2eth1
+ip -net "$ns2" addr add 10.0.2.2/24 dev ns2eth1
+ip -net "$ns2" addr add dead:beef:1::2/64 dev ns2eth1 nodad
+ip -net "$ns2" addr add dead:beef:2::2/64 dev ns2eth1 nodad
+ip -net "$ns2" link set ns2eth1 up
+
+stdbuf -o0 -e0 printf "Created network namespaces ns1, ns2         \t\t\t[OK]\n"
+
+make_file()
+{
+	# Store a chunk of data in a file to transmit over an MPTCP connection
+	local name=$1
+	local ksize=1
+
+	dd if=/dev/urandom of="$name" bs=2 count=$ksize 2> /dev/null
+	echo -e "\nMPTCP_TEST_FILE_END_MARKER" >> "$name"
+}
+
+make_connection()
+{
+	local file
+	file=$(mktemp)
+	make_file "$file" "client"
+
+	local is_v6=$1
+	local app_port=$app4_port
+	local connect_addr="10.0.1.1"
+	local listen_addr="0.0.0.0"
+	if [ "$is_v6" = "v6" ]
+	then
+		connect_addr="dead:beef:1::1"
+		listen_addr="::"
+		app_port=$app6_port
+	else
+		is_v6="v4"
+	fi
+
+	# Capture netlink events over the two network namespaces running
+	# the MPTCP client and server
+	local client_evts
+	client_evts=$(mktemp)
+	:>"$client_evts"
+	ip netns exec "$ns2" ./pm_nl_ctl events >> "$client_evts" 2>&1 &
+	local client_evts_pid=$!
+	local server_evts
+	server_evts=$(mktemp)
+	:>"$server_evts"
+	ip netns exec "$ns1" ./pm_nl_ctl events >> "$server_evts" 2>&1 &
+	local server_evts_pid=$!
+	sleep 0.5
+
+	# Run the server
+	ip netns exec "$ns1" \
+	   ./mptcp_connect -s MPTCP -w 300 -p $app_port -l $listen_addr > /dev/null 2>&1 &
+	local server_pid=$!
+	sleep 0.5
+
+	# Run the client, transfer $file and stay connected to the server
+	# to conduct tests
+	ip netns exec "$ns2" \
+	   ./mptcp_connect -s MPTCP -w 300 -m sendfile -p $app_port $connect_addr\
+	   2>&1 > /dev/null < "$file" &
+	local client_pid=$!
+	sleep 1
+
+	# Capture client/server attributes from MPTCP connection netlink events
+	kill $client_evts_pid
+
+	local client_token
+	local client_port
+	local client_serverside
+	local server_token
+	local server_serverside
+
+	client_token=$(sed --unbuffered -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q' "$client_evts")
+	client_port=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$client_evts")
+	client_serverside=$(sed --unbuffered -n 's/.*\(server_side:\)\([[:digit:]]*\).*$/\2/p;q'\
+				      "$client_evts")
+	kill $server_evts_pid
+	server_token=$(sed --unbuffered -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q' "$server_evts")
+	server_serverside=$(sed --unbuffered -n 's/.*\(server_side:\)\([[:digit:]]*\).*$/\2/p;q'\
+				      "$server_evts")
+	rm -f "$client_evts" "$server_evts" "$file"
+
+	if [ "$client_token" != "" ] && [ "$server_token" != "" ] && [ "$client_serverside" = 0 ] &&
+		   [ "$server_serverside" = 1 ]
+	then
+		stdbuf -o0 -e0 printf "Established IP%s MPTCP Connection ns2 => ns1    \t\t[OK]\n" $is_v6
+	else
+		exit 1
+	fi
+
+	if [ "$is_v6" = "v6" ]
+	then
+		client6_token=$client_token
+		server6_token=$server_token
+		client6_port=$client_port
+		client6_pid=$client_pid
+		server6_pid=$server_pid
+	else
+		client4_token=$client_token
+		server4_token=$server_token
+		client4_port=$client_port
+		client4_pid=$client_pid
+		server4_pid=$server_pid
+	fi
+}
+
+verify_announce_event()
+{
+	local evt=$1
+	local e_type=$2
+	local e_token=$3
+	local e_addr=$4
+	local e_id=$5
+	local e_dport=$6
+	local e_af=$7
+	local type
+	local token
+	local addr
+	local dport
+	local id
+
+	type=$(sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	token=$(sed --unbuffered -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	if [ "$e_af" = "v6" ]
+	then
+		addr=$(sed --unbuffered -n 's/.*\(daddr6:\)\([0-9a-f:.]*\).*$/\2/p;q' "$evt")
+	else
+		addr=$(sed --unbuffered -n 's/.*\(daddr4:\)\([0-9.]*\).*$/\2/p;q' "$evt")
+	fi
+	dport=$(sed --unbuffered -n 's/.*\(dport:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	id=$(sed --unbuffered -n 's/.*\(rem_id:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	if [ "$type" = "$e_type" ] && [ "$token" = "$e_token" ] &&
+		   [ "$addr" = "$e_addr" ] && [ "$dport" = "$e_dport" ] &&
+		   [ "$id" = "$e_id" ]
+	then
+		stdbuf -o0 -e0 printf "[OK]\n"
+		return 0
+	fi
+	stdbuf -o0 -e0 printf "[FAIL]\n"
+	exit 1
+}
+
+test_announce()
+{
+	local evts
+	evts=$(mktemp)
+	# Capture events on the network namespace running the server
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl events >> "$evts" 2>&1 &
+	evts_pid=$!
+	sleep 0.5
+
+	# ADD_ADDR using an invalid token should result in no action
+	local invalid_token=$(( client4_token - 1))
+	ip netns exec "$ns2" ./pm_nl_ctl ann 10.0.2.2 token $invalid_token id\
+	   $client_addr_id dev ns2eth1 > /dev/null 2>&1
+
+	local type
+	type=$(sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+	stdbuf -o0 -e0 printf "ADD_ADDR 10.0.2.2 (ns2) => ns1, invalid token    \t\t"
+	if [ "$type" = "" ]
+	then
+		stdbuf -o0 -e0 printf "[OK]\n"
+	else
+		stdbuf -o0 -e0 printf "[FAIL]\n"
+		exit 1
+	fi
+
+	# ADD_ADDR from the client to server machine reusing the subflow port
+	:>"$evts"
+	ip netns exec "$ns2"\
+	   ./pm_nl_ctl ann 10.0.2.2 token "$client4_token" id $client_addr_id dev\
+	   ns2eth1 > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "ADD_ADDR id:%d 10.0.2.2 (ns2) => ns1, reuse port \t\t" $client_addr_id
+	sleep 0.5
+	verify_announce_event "$evts" "$ANNOUNCED" "$server4_token" "10.0.2.2" "$client_addr_id"\
+			      "$client4_port"
+
+	# ADD_ADDR6 from the client to server machine reusing the subflow port
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl ann\
+	   dead:beef:2::2 token "$client6_token" id $client_addr_id dev ns2eth1 > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "ADD_ADDR6 id:%d dead:beef:2::2 (ns2) => ns1, reuse port\t\t" $client_addr_id
+	sleep 0.5
+	verify_announce_event "$evts" "$ANNOUNCED" "$server6_token" "dead:beef:2::2"\
+			      "$client_addr_id" "$client6_port" "v6"
+
+	# ADD_ADDR from the client to server machine using a new port
+	:>"$evts"
+	client_addr_id=$((client_addr_id+1))
+	ip netns exec "$ns2" ./pm_nl_ctl ann 10.0.2.2 token "$client4_token" id\
+	   $client_addr_id dev ns2eth1 port $new4_port > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "ADD_ADDR id:%d 10.0.2.2 (ns2) => ns1, new port \t\t\t" $client_addr_id
+	sleep 0.5
+	verify_announce_event "$evts" "$ANNOUNCED" "$server4_token" "10.0.2.2"\
+			      "$client_addr_id" "$new4_port"
+
+	kill $evts_pid
+
+	# Capture events on the network namespace running the client
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl events >> "$evts" 2>&1 &
+	evts_pid=$!
+	sleep 0.5
+
+	# ADD_ADDR from the server to client machine reusing the subflow port
+	ip netns exec "$ns1" ./pm_nl_ctl ann 10.0.2.1 token "$server4_token" id\
+	   $server_addr_id dev ns1eth2 > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "ADD_ADDR id:%d 10.0.2.1 (ns1) => ns2, reuse port \t\t" $server_addr_id
+	sleep 0.5
+	verify_announce_event "$evts" "$ANNOUNCED" "$client4_token" "10.0.2.1"\
+			      "$server_addr_id" "$app4_port"
+
+	# ADD_ADDR6 from the server to client machine reusing the subflow port
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl ann dead:beef:2::1 token "$server6_token" id\
+	   $server_addr_id dev ns1eth2 > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "ADD_ADDR6 id:%d dead:beef:2::1 (ns1) => ns2, reuse port\t\t" $server_addr_id
+	sleep 0.5
+	verify_announce_event "$evts" "$ANNOUNCED" "$client6_token" "dead:beef:2::1"\
+			      "$server_addr_id" "$app6_port" "v6"
+
+	# ADD_ADDR from the server to client machine using a new port
+	:>"$evts"
+	server_addr_id=$((server_addr_id+1))
+	ip netns exec "$ns1" ./pm_nl_ctl ann 10.0.2.1 token "$server4_token" id\
+	   $server_addr_id dev ns1eth2 port $new4_port > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "ADD_ADDR id:%d 10.0.2.1 (ns1) => ns2, new port \t\t\t" $server_addr_id
+	sleep 0.5
+	verify_announce_event "$evts" "$ANNOUNCED" "$client4_token" "10.0.2.1"\
+			      "$server_addr_id" "$new4_port"
+
+	kill $evts_pid
+	rm -f "$evts"
+}
+
+verify_remove_event()
+{
+	local evt=$1
+	local e_type=$2
+	local e_token=$3
+	local e_id=$4
+	local type
+	local token
+	local id
+
+	type=$(sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	token=$(sed --unbuffered -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	id=$(sed --unbuffered -n 's/.*\(rem_id:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	if [ "$type" = "$e_type" ] && [ "$token" = "$e_token" ] &&
+		   [ "$id" = "$e_id" ]
+	then
+		stdbuf -o0 -e0 printf "[OK]\n"
+		return 0
+	fi
+	stdbuf -o0 -e0 printf "[FAIL]\n"
+	exit 1
+}
+
+test_remove()
+{
+	local evts
+	evts=$(mktemp)
+
+	# Capture events on the network namespace running the server
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl events >> "$evts" 2>&1 &
+	evts_pid=$!
+	sleep 0.5
+
+	# RM_ADDR using an invalid token should result in no action
+	local invalid_token=$(( client4_token - 1 ))
+	ip netns exec "$ns2" ./pm_nl_ctl rem token $invalid_token id\
+	   $client_addr_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR id:%d ns2 => ns1, invalid token                    \t"\
+	       $client_addr_id
+	local type
+	type=$(sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+	if [ "$type" = "" ]
+	then
+		stdbuf -o0 -e0 printf "[OK]\n"
+	else
+		stdbuf -o0 -e0 printf "[FAIL]\n"
+	fi
+
+	# RM_ADDR using an invalid addr id should result in no action
+	local invalid_id=$(( client_addr_id + 1 ))
+	ip netns exec "$ns2" ./pm_nl_ctl rem token "$client4_token" id\
+	   $invalid_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR id:%d ns2 => ns1, invalid id                    \t"\
+	       $invalid_id
+	type=$(sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+	if [ "$type" = "" ]
+	then
+		stdbuf -o0 -e0 printf "[OK]\n"
+	else
+		stdbuf -o0 -e0 printf "[FAIL]\n"
+	fi
+
+	# RM_ADDR from the client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl rem token "$client4_token" id\
+	   $client_addr_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR id:%d ns2 => ns1                                \t"\
+	       $client_addr_id
+	sleep 0.5
+	verify_remove_event "$evts" "$REMOVED" "$server4_token" "$client_addr_id"
+
+	# RM_ADDR from the client to server machine
+	:>"$evts"
+	client_addr_id=$(( client_addr_id - 1 ))
+	ip netns exec "$ns2" ./pm_nl_ctl rem token "$client4_token" id\
+	   $client_addr_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR id:%d ns2 => ns1                                \t"\
+	       $client_addr_id
+	sleep 0.5
+	verify_remove_event "$evts" "$REMOVED" "$server4_token" "$client_addr_id"
+
+	# RM_ADDR6 from the client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl rem token "$client6_token" id\
+	   $client_addr_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR6 id:%d ns2 => ns1                               \t"\
+	       $client_addr_id
+	sleep 0.5
+	verify_remove_event "$evts" "$REMOVED" "$server6_token" "$client_addr_id"
+
+	kill $evts_pid
+
+	# Capture events on the network namespace running the client
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl events >> "$evts" 2>&1 &
+	evts_pid=$!
+	sleep 0.5
+
+	# RM_ADDR from the server to client machine
+	ip netns exec "$ns1" ./pm_nl_ctl rem token "$server4_token" id\
+	   $server_addr_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR id:%d ns1 => ns2                                \t"\
+	       $server_addr_id
+	sleep 0.5
+	verify_remove_event "$evts" "$REMOVED" "$client4_token" "$server_addr_id"
+
+	# RM_ADDR from the server to client machine
+	:>"$evts"
+	server_addr_id=$(( server_addr_id - 1 ))
+	ip netns exec "$ns1" ./pm_nl_ctl rem token "$server4_token" id\
+	   $server_addr_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR id:%d ns1 => ns2                                \t" $server_addr_id
+	sleep 0.5
+	verify_remove_event "$evts" "$REMOVED" "$client4_token" "$server_addr_id"
+
+	# RM_ADDR6 from the server to client machine
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl rem token "$server6_token" id\
+	   $server_addr_id > /dev/null 2>&1
+	stdbuf -o0 -e0 printf "RM_ADDR6 id:%d ns1 => ns2                               \t" $server_addr_id
+	sleep 0.5
+	verify_remove_event "$evts" "$REMOVED" "$client6_token" "$server_addr_id"
+
+	kill $evts_pid
+	rm -f "$evts"
+}
+
+verify_subflow_events()
+{
+	local evt=$1
+	local e_type=$2
+	local e_token=$3
+	local e_family=$4
+	local e_saddr=$5
+	local e_daddr=$6
+	local e_dport=$7
+	local e_locid=$8
+	local e_remid=$9
+	shift 2
+	local e_from=$8
+	local e_to=$9
+	local type
+	local token
+	local family
+	local saddr
+	local daddr
+	local dport
+	local locid
+	local remid
+
+	if [ "$e_type" = "$SUB_ESTABLISHED" ]
+	then
+		if [ "$e_family" = "$AF_INET6" ]
+		then
+			stdbuf -o0 -e0 printf "CREATE_SUBFLOW6 %s (%s) => %s (%s)    "\
+			       "$e_saddr" "$e_from" "$e_daddr" "$e_to"
+		else
+			stdbuf -o0 -e0 printf "CREATE_SUBFLOW %s (%s) => %s (%s)         \t"\
+			       "$e_saddr" "$e_from" "$e_daddr" "$e_to"
+		fi
+	else
+		if [ "$e_family" = "$AF_INET6" ]
+		then
+			stdbuf -o0 -e0 printf "DESTROY_SUBFLOW6 %s (%s) => %s (%s)   "\
+			       "$e_saddr" "$e_from" "$e_daddr" "$e_to"
+		else
+			stdbuf -o0 -e0 printf "DESTROY_SUBFLOW %s (%s) => %s (%s)         \t"\
+			       "$e_saddr" "$e_from" "$e_daddr" "$e_to"
+		fi
+	fi
+
+	type=$(sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	token=$(sed --unbuffered -n 's/.*\(token:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	family=$(sed --unbuffered -n 's/.*\(family:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	dport=$(sed --unbuffered -n 's/.*\(dport:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	locid=$(sed --unbuffered -n 's/.*\(loc_id:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	remid=$(sed --unbuffered -n 's/.*\(rem_id:\)\([[:digit:]]*\).*$/\2/p;q' "$evt")
+	if [ "$family" = "$AF_INET6" ]
+	then
+		saddr=$(sed --unbuffered -n 's/.*\(saddr6:\)\([0-9a-f:.]*\).*$/\2/p;q' "$evt")
+		daddr=$(sed --unbuffered -n 's/.*\(daddr6:\)\([0-9a-f:.]*\).*$/\2/p;q' "$evt")
+	else
+		saddr=$(sed --unbuffered -n 's/.*\(saddr4:\)\([0-9.]*\).*$/\2/p;q' "$evt")
+		daddr=$(sed --unbuffered -n 's/.*\(daddr4:\)\([0-9.]*\).*$/\2/p;q' "$evt")
+	fi
+
+	if [ "$type" = "$e_type" ] && [ "$token" = "$e_token" ] &&
+		   [ "$daddr" = "$e_daddr" ] && [ "$e_dport" = "$dport" ] &&
+		   [ "$family" = "$e_family" ] && [ "$saddr" = "$e_saddr" ] &&
+		   [ "$e_locid" = "$locid" ] && [ "$e_remid" = "$remid" ]
+	then
+		stdbuf -o0 -e0 printf "[OK]\n"
+		return 0
+	fi
+	stdbuf -o0 -e0 printf "[FAIL]\n"
+	exit 1
+}
+
+test_subflows()
+{
+	local evts
+	evts=$(mktemp)
+	# Capture events on the network namespace running the server
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl events >> "$evts" 2>&1 &
+	evts_pid=$!
+	sleep 0.5
+
+	# Attempt to add a listener at 10.0.2.2:<subflow-port>
+	ip netns exec "$ns2" ./pm_nl_ctl listen 10.0.2.2\
+	   "$client4_port" > /dev/null 2>&1 &
+	local listener_pid=$!
+
+	# ADD_ADDR from client to server machine reusing the subflow port
+	ip netns exec "$ns2" ./pm_nl_ctl ann 10.0.2.2 token "$client4_token" id\
+	   $client_addr_id > /dev/null 2>&1
+	sleep 0.5
+
+	# CREATE_SUBFLOW from server to client machine
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl csf lip 10.0.2.1 lid 23 rip 10.0.2.2\
+	   rport "$client4_port" token "$server4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_ESTABLISHED" "$server4_token" "$AF_INET" "10.0.2.1"\
+			      "10.0.2.2" "$client4_port" "23" "$client_addr_id" "ns1" "ns2"
+
+	# Delete the listener from the client ns, if one was created
+	kill $listener_pid > /dev/null 2>&1
+
+	local sport
+	sport=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+
+	# DESTROY_SUBFLOW from server to client machine
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl dsf lip 10.0.2.1 lport "$sport" rip 10.0.2.2 rport\
+	   "$client4_port" token "$server4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_CLOSED" "$server4_token" "$AF_INET" "10.0.2.1"\
+			      "10.0.2.2" "$client4_port" "23" "$client_addr_id" "ns1" "ns2"
+
+	# RM_ADDR from client to server machine
+	ip netns exec "$ns2" ./pm_nl_ctl rem id $client_addr_id token\
+	   "$client4_token" > /dev/null 2>&1
+	sleep 0.5
+
+	# Attempt to add a listener at dead:beef:2::2:<subflow-port>
+	ip netns exec "$ns2" ./pm_nl_ctl listen dead:beef:2::2\
+	   "$client6_port" > /dev/null 2>&1 &
+	listener_pid=$!
+
+	# ADD_ADDR6 from client to server machine reusing the subflow port
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl ann dead:beef:2::2 token "$client6_token" id\
+	   $client_addr_id > /dev/null 2>&1
+	sleep 0.5
+
+	# CREATE_SUBFLOW6 from server to client machine
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl csf lip dead:beef:2::1 lid 23 rip\
+	   dead:beef:2::2 rport "$client6_port" token "$server6_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_ESTABLISHED" "$server6_token" "$AF_INET6"\
+			      "dead:beef:2::1" "dead:beef:2::2" "$client6_port" "23"\
+			      "$client_addr_id" "ns1" "ns2"
+
+	# Delete the listener from the client ns, if one was created
+	kill $listener_pid > /dev/null 2>&1
+
+	sport=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+
+	# DESTROY_SUBFLOW6 from server to client machine
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl dsf lip dead:beef:2::1 lport "$sport" rip\
+	   dead:beef:2::2 rport "$client6_port" token "$server6_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_CLOSED" "$server6_token" "$AF_INET6"\
+			      "dead:beef:2::1" "dead:beef:2::2" "$client6_port" "23"\
+			      "$client_addr_id" "ns1" "ns2"
+
+	# RM_ADDR from client to server machine
+	ip netns exec "$ns2" ./pm_nl_ctl rem id $client_addr_id token\
+	   "$client6_token" > /dev/null 2>&1
+	sleep 0.5
+
+	# Attempt to add a listener at 10.0.2.2:<new-port>
+	ip netns exec "$ns2" ./pm_nl_ctl listen 10.0.2.2\
+	   $new4_port > /dev/null 2>&1 &
+	listener_pid=$!
+
+	# ADD_ADDR from client to server machine using a new port
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl ann 10.0.2.2 token "$client4_token" id\
+	   $client_addr_id port $new4_port > /dev/null 2>&1
+	sleep 0.5
+
+	# CREATE_SUBFLOW from server to client machine
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl csf lip 10.0.2.1 lid 23 rip 10.0.2.2 rport\
+	   $new4_port token "$server4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_ESTABLISHED" "$server4_token" "$AF_INET"\
+			      "10.0.2.1" "10.0.2.2" "$new4_port" "23"\
+			      "$client_addr_id" "ns1" "ns2"
+
+	# Delete the listener from the client ns, if one was created
+	kill $listener_pid > /dev/null 2>&1
+
+	sport=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+
+	# DESTROY_SUBFLOW from server to client machine
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl dsf lip 10.0.2.1 lport "$sport" rip 10.0.2.2 rport\
+	   $new4_port token "$server4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_CLOSED" "$server4_token" "$AF_INET" "10.0.2.1"\
+			      "10.0.2.2" "$new4_port" "23" "$client_addr_id" "ns1" "ns2"
+
+	# RM_ADDR from client to server machine
+	ip netns exec "$ns2" ./pm_nl_ctl rem id $client_addr_id token\
+	   "$client4_token" > /dev/null 2>&1
+
+	kill $evts_pid
+
+	# Capture events on the network namespace running the client
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl events >> "$evts" 2>&1 &
+	evts_pid=$!
+	sleep 0.5
+
+	# Attempt to add a listener at 10.0.2.1:<subflow-port>
+	ip netns exec "$ns1" ./pm_nl_ctl listen 10.0.2.1\
+	   $app4_port > /dev/null 2>&1 &
+	listener_pid=$!
+
+	# ADD_ADDR from server to client machine reusing the subflow port
+	ip netns exec "$ns1" ./pm_nl_ctl ann 10.0.2.1 token "$server4_token" id\
+	   $server_addr_id > /dev/null 2>&1
+	sleep 0.5
+
+	# CREATE_SUBFLOW from client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl csf lip 10.0.2.2 lid 23 rip 10.0.2.1 rport\
+	   $app4_port token "$client4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_ESTABLISHED" "$client4_token" "$AF_INET" "10.0.2.2"\
+			      "10.0.2.1" "$app4_port" "23" "$server_addr_id" "ns2" "ns1"
+
+	# Delete the listener from the server ns, if one was created
+	kill $listener_pid> /dev/null 2>&1
+
+	sport=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+
+	# DESTROY_SUBFLOW from client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl dsf lip 10.0.2.2 lport "$sport" rip 10.0.2.1 rport\
+	   $app4_port token "$client4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_CLOSED" "$client4_token" "$AF_INET" "10.0.2.2"\
+			      "10.0.2.1" "$app4_port" "23" "$server_addr_id" "ns2" "ns1"
+
+	# RM_ADDR from server to client machine
+	ip netns exec "$ns1" ./pm_nl_ctl rem id $server_addr_id token\
+	   "$server4_token" > /dev/null 2>&1
+	sleep 0.5
+
+	# Attempt to add a listener at dead:beef:2::1:<subflow-port>
+	ip netns exec "$ns1" ./pm_nl_ctl listen dead:beef:2::1\
+	   $app6_port > /dev/null 2>&1 &
+	listener_pid=$!
+
+	# ADD_ADDR6 from server to client machine reusing the subflow port
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl ann dead:beef:2::1 token "$server6_token" id\
+	   $server_addr_id > /dev/null 2>&1
+	sleep 0.5
+
+	# CREATE_SUBFLOW6 from client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl csf lip dead:beef:2::2 lid 23 rip\
+	   dead:beef:2::1 rport $app6_port token "$client6_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_ESTABLISHED" "$client6_token"\
+			      "$AF_INET6" "dead:beef:2::2"\
+			      "dead:beef:2::1" "$app6_port" "23"\
+			      "$server_addr_id" "ns2" "ns1"
+
+	# Delete the listener from the server ns, if one was created
+	kill $listener_pid > /dev/null 2>&1
+
+	sport=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+
+	# DESTROY_SUBFLOW6 from client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl dsf lip dead:beef:2::2 lport "$sport" rip\
+	   dead:beef:2::1 rport $app6_port token "$client6_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_CLOSED" "$client6_token" "$AF_INET6" "dead:beef:2::2"\
+			      "dead:beef:2::1" "$app6_port" "23" "$server_addr_id" "ns2" "ns1"
+
+	# RM_ADDR6 from server to client machine
+	ip netns exec "$ns1" ./pm_nl_ctl rem id $server_addr_id token\
+	   "$server6_token" > /dev/null 2>&1
+	sleep 0.5
+
+	# Attempt to add a listener at 10.0.2.1:<new-port>
+	ip netns exec "$ns1" ./pm_nl_ctl listen 10.0.2.1\
+	   $new4_port > /dev/null 2>&1 &
+	listener_pid=$!
+
+	# ADD_ADDR from server to client machine using a new port
+	:>"$evts"
+	ip netns exec "$ns1" ./pm_nl_ctl ann 10.0.2.1 token "$server4_token" id\
+	   $server_addr_id port $new4_port > /dev/null 2>&1
+	sleep 0.5
+
+	# CREATE_SUBFLOW from client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl csf lip 10.0.2.2 lid 23 rip 10.0.2.1 rport\
+	   $new4_port token "$client4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_ESTABLISHED" "$client4_token" "$AF_INET"\
+			      "10.0.2.2" "10.0.2.1" "$new4_port" "23" "$server_addr_id" "ns2" "ns1"
+
+	# Delete the listener from the server ns, if one was created
+	kill $listener_pid > /dev/null 2>&1
+
+	sport=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$evts")
+
+	# DESTROY_SUBFLOW from client to server machine
+	:>"$evts"
+	ip netns exec "$ns2" ./pm_nl_ctl dsf lip 10.0.2.2 lport "$sport" rip 10.0.2.1 rport\
+	   $new4_port token "$client4_token" > /dev/null 2>&1
+	sleep 0.5
+	verify_subflow_events "$evts" "$SUB_CLOSED" "$client4_token" "$AF_INET" "10.0.2.2"\
+			      "10.0.2.1" "$new4_port" "23" "$server_addr_id" "ns2" "ns1"
+
+	# RM_ADDR from server to client machine
+	ip netns exec "$ns1" ./pm_nl_ctl rem id $server_addr_id token\
+	   "$server4_token" > /dev/null 2>&1
+
+	kill $evts_pid
+	rm -f "$evts"
+}
+
+make_connection
+make_connection "v6"
+test_announce
+test_remove
+test_subflows
+
+exit 0