#!/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"

kill_wait()
{
	kill $1 > /dev/null 2>&1
	wait $1 2>/dev/null
}

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_wait $server4_pid
	fi
	if [ $client6_pid -ne 0 ]; then
		kill -SIGUSR1 $client6_pid > /dev/null 2>&1
	fi
	if [ $server6_pid -ne 0 ]; then
		kill_wait $server6_pid
	fi
	if [ $evts_pid -ne 0 ]; then
		kill_wait $evts_pid
	fi
	local netns
	for netns in "$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_wait $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_wait $server_evts_pid
	server_token=$(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_wait $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_wait $evts_pid
	rm -f "$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_wait $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_wait $evts_pid
	rm -f "$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_wait $listener_pid

	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_wait $listener_pid

	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_wait $listener_pid

	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_wait $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_wait $listener_pid

	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_wait $listener_pid

	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_wait $listener_pid

	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_wait $evts_pid
	rm -f "$evts"
}

test_subflows_v4_v6_mix()
{
	# Attempt to add a listener at 10.0.2.1:<subflow-port>
	ip netns exec "$ns1" ./pm_nl_ctl listen 10.0.2.1\
	   $app6_port > /dev/null 2>&1 &
	local listener_pid=$!

	# ADD_ADDR4 from server to client machine reusing the subflow port on
	# the established v6 connection
	:>"$client_evts"
	ip netns exec "$ns1" ./pm_nl_ctl ann 10.0.2.1 token "$server6_token" id\
	   $server_addr_id dev ns1eth2 > /dev/null 2>&1
	stdbuf -o0 -e0 printf "ADD_ADDR4 id:%d 10.0.2.1 (ns1) => ns2, reuse port\t\t" $server_addr_id
	sleep 0.5
	verify_announce_event "$client_evts" "$ANNOUNCED" "$client6_token" "10.0.2.1"\
			      "$server_addr_id" "$app6_port"

	# CREATE_SUBFLOW from client to server machine
	:>"$client_evts"
	ip netns exec "$ns2" ./pm_nl_ctl csf lip 10.0.2.2 lid 23 rip 10.0.2.1 rport\
	   $app6_port token "$client6_token" > /dev/null 2>&1
	sleep 0.5
	verify_subflow_events "$client_evts" "$SUB_ESTABLISHED" "$client6_token"\
			      "$AF_INET" "10.0.2.2" "10.0.2.1" "$app6_port" "23"\
			      "$server_addr_id" "ns2" "ns1"

	# Delete the listener from the server ns, if one was created
	kill_wait $listener_pid

	sport=$(sed --unbuffered -n 's/.*\(sport:\)\([[:digit:]]*\).*$/\2/p;q' "$client_evts")

	# DESTROY_SUBFLOW from client to server machine
	:>"$client_evts"
	ip netns exec "$ns2" ./pm_nl_ctl dsf lip 10.0.2.2 lport "$sport" rip 10.0.2.1 rport\
	   $app6_port token "$client6_token" > /dev/null 2>&1
	sleep 0.5
	verify_subflow_events "$client_evts" "$SUB_CLOSED" "$client6_token" \
			      "$AF_INET" "10.0.2.2" "10.0.2.1" "$app6_port" "23"\
			      "$server_addr_id" "ns2" "ns1"

	# RM_ADDR from server to client machine
	ip netns exec "$ns1" ./pm_nl_ctl rem id $server_addr_id token\
	   "$server6_token" > /dev/null 2>&1
	sleep 0.5
}

test_prio()
{
	local count

	# Send MP_PRIO signal from client to server machine
	ip netns exec "$ns2" ./pm_nl_ctl set 10.0.1.2 port "$client4_port" flags backup token "$client4_token" rip 10.0.1.1 rport "$server4_port"
	sleep 0.5

	# Check TX
	stdbuf -o0 -e0 printf "MP_PRIO TX                                                 \t"
	count=$(ip netns exec "$ns2" nstat -as | grep MPTcpExtMPPrioTx | awk '{print $2}')
	[ -z "$count" ] && count=0
	if [ $count != 1 ]; then
		stdbuf -o0 -e0 printf "[FAIL]\n"
		exit 1
	else
		stdbuf -o0 -e0 printf "[OK]\n"
	fi

	# Check RX
	stdbuf -o0 -e0 printf "MP_PRIO RX                                                 \t"
	count=$(ip netns exec "$ns1" nstat -as | grep MPTcpExtMPPrioRx | awk '{print $2}')
	[ -z "$count" ] && count=0
	if [ $count != 1 ]; then
		stdbuf -o0 -e0 printf "[FAIL]\n"
		exit 1
	else
		stdbuf -o0 -e0 printf "[OK]\n"
	fi
}

make_connection
make_connection "v6"
test_announce
test_remove
test_subflows
test_subflows_v4_v6_mix
test_prio

exit 0