#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

ret=0
sin=""
sinfail=""
sout=""
cin=""
cinfail=""
cinsent=""
cout=""
ksft_skip=4
timeout_poll=30
timeout_test=$((timeout_poll * 2 + 1))
capture=0
checksum=0
ip_mptcp=0
check_invert=0
init=0

TEST_COUNT=0
nr_blank=40

# generated using "nfbpf_compile '(ip && (ip[54] & 0xf0) == 0x30) ||
#				  (ip6 && (ip6[74] & 0xf0) == 0x30)'"
CBPF_MPTCP_SUBOPTION_ADD_ADDR="14,
			       48 0 0 0,
			       84 0 0 240,
			       21 0 3 64,
			       48 0 0 54,
			       84 0 0 240,
			       21 6 7 48,
			       48 0 0 0,
			       84 0 0 240,
			       21 0 4 96,
			       48 0 0 74,
			       84 0 0 240,
			       21 0 1 48,
			       6 0 0 65535,
			       6 0 0 0"

init_partial()
{
	capout=$(mktemp)

	rndh=$(mktemp -u XXXXXX)

	ns1="ns1-$rndh"
	ns2="ns2-$rndh"

	for netns in "$ns1" "$ns2";do
		ip netns add $netns || exit $ksft_skip
		ip -net $netns link set lo up
		ip netns exec $netns sysctl -q net.mptcp.enabled=1
		ip netns exec $netns sysctl -q net.ipv4.conf.all.rp_filter=0
		ip netns exec $netns sysctl -q net.ipv4.conf.default.rp_filter=0
		if [ $checksum -eq 1 ]; then
			ip netns exec $netns sysctl -q net.mptcp.checksum_enabled=1
		fi
	done

	check_invert=0

	#  ns1              ns2
	# ns1eth1    ns2eth1
	# ns1eth2    ns2eth2
	# ns1eth3    ns2eth3
	# ns1eth4    ns2eth4

	for i in `seq 1 4`; do
		ip link add ns1eth$i netns "$ns1" type veth peer name ns2eth$i netns "$ns2"
		ip -net "$ns1" addr add 10.0.$i.1/24 dev ns1eth$i
		ip -net "$ns1" addr add dead:beef:$i::1/64 dev ns1eth$i nodad
		ip -net "$ns1" link set ns1eth$i up

		ip -net "$ns2" addr add 10.0.$i.2/24 dev ns2eth$i
		ip -net "$ns2" addr add dead:beef:$i::2/64 dev ns2eth$i nodad
		ip -net "$ns2" link set ns2eth$i up

		# let $ns2 reach any $ns1 address from any interface
		ip -net "$ns2" route add default via 10.0.$i.1 dev ns2eth$i metric 10$i
		ip -net "$ns2" route add default via dead:beef:$i::1 dev ns2eth$i metric 10$i
	done
}

init_shapers()
{
	for i in `seq 1 4`; do
		tc -n $ns1 qdisc add dev ns1eth$i root netem rate 20mbit delay 1
		tc -n $ns2 qdisc add dev ns2eth$i root netem rate 20mbit delay 1
	done
}

cleanup_partial()
{
	rm -f "$capout"

	for netns in "$ns1" "$ns2"; do
		ip netns del $netns
		rm -f /tmp/$netns.{nstat,out}
	done
}

check_tools()
{
	if ! ip -Version &> /dev/null; then
		echo "SKIP: Could not run test without ip tool"
		exit $ksft_skip
	fi

	if ! iptables -V &> /dev/null; then
		echo "SKIP: Could not run all tests without iptables tool"
		exit $ksft_skip
	fi

	if ! ip6tables -V &> /dev/null; then
		echo "SKIP: Could not run all tests without ip6tables tool"
		exit $ksft_skip
	fi
}

init() {
	init=1

	check_tools

	sin=$(mktemp)
	sout=$(mktemp)
	cin=$(mktemp)
	cinsent=$(mktemp)
	cout=$(mktemp)

	trap cleanup EXIT

	make_file "$cin" "client" 1
	make_file "$sin" "server" 1
}

cleanup()
{
	rm -f "$cin" "$cout" "$sinfail"
	rm -f "$sin" "$sout" "$cinsent" "$cinfail"
	cleanup_partial
}

reset()
{
	if [ "${init}" != "1" ]; then
		init
	else
		cleanup_partial
	fi

	init_partial
}

reset_with_cookies()
{
	reset

	for netns in "$ns1" "$ns2";do
		ip netns exec $netns sysctl -q net.ipv4.tcp_syncookies=2
	done
}

reset_with_add_addr_timeout()
{
	local ip="${1:-4}"
	local tables

	tables="iptables"
	if [ $ip -eq 6 ]; then
		tables="ip6tables"
	fi

	reset

	ip netns exec $ns1 sysctl -q net.mptcp.add_addr_timeout=1
	ip netns exec $ns2 $tables -A OUTPUT -p tcp \
		-m tcp --tcp-option 30 \
		-m bpf --bytecode \
		"$CBPF_MPTCP_SUBOPTION_ADD_ADDR" \
		-j DROP
}

reset_with_checksum()
{
	local ns1_enable=$1
	local ns2_enable=$2

	reset

	ip netns exec $ns1 sysctl -q net.mptcp.checksum_enabled=$ns1_enable
	ip netns exec $ns2 sysctl -q net.mptcp.checksum_enabled=$ns2_enable
}

reset_with_allow_join_id0()
{
	local ns1_enable=$1
	local ns2_enable=$2

	reset

	ip netns exec $ns1 sysctl -q net.mptcp.allow_join_initial_addr_port=$ns1_enable
	ip netns exec $ns2 sysctl -q net.mptcp.allow_join_initial_addr_port=$ns2_enable
}

print_file_err()
{
	ls -l "$1" 1>&2
	echo "Trailing bytes are: "
	tail -c 27 "$1"
}

check_transfer()
{
	in=$1
	out=$2
	what=$3

	cmp -l "$in" "$out" | while read line; do
		local arr=($line)

		let sum=0${arr[1]}+0${arr[2]}
		if [ $check_invert -eq 0 ] || [ $sum -ne $((0xff)) ]; then
			echo "[ FAIL ] $what does not match (in, out):"
			print_file_err "$in"
			print_file_err "$out"
			ret=1

			return 1
		else
			echo "$what has inverted byte at ${arr[0]}"
		fi
	done

	return 0
}

do_ping()
{
	listener_ns="$1"
	connector_ns="$2"
	connect_addr="$3"

	ip netns exec ${connector_ns} ping -q -c 1 $connect_addr >/dev/null
	if [ $? -ne 0 ] ; then
		echo "$listener_ns -> $connect_addr connectivity [ FAIL ]" 1>&2
		ret=1
	fi
}

link_failure()
{
	ns="$1"

	if [ -z "$FAILING_LINKS" ]; then
		l=$((RANDOM%4))
		FAILING_LINKS=$((l+1))
	fi

	for l in $FAILING_LINKS; do
		veth="ns1eth$l"
		ip -net "$ns" link set "$veth" down
	done
}

# $1: IP address
is_v6()
{
	[ -z "${1##*:*}" ]
}

# $1: ns, $2: port
wait_local_port_listen()
{
	local listener_ns="${1}"
	local port="${2}"

	local port_hex i

	port_hex="$(printf "%04X" "${port}")"
	for i in $(seq 10); do
		ip netns exec "${listener_ns}" cat /proc/net/tcp* | \
			awk "BEGIN {rc=1} {if (\$2 ~ /:${port_hex}\$/ && \$4 ~ /0A/) {rc=0; exit}} END {exit rc}" &&
			break
		sleep 0.1
	done
}

rm_addr_count()
{
	ns=${1}

	ip netns exec ${ns} nstat -as | grep MPTcpExtRmAddr | awk '{print $2}'
}

# $1: ns, $2: old rm_addr counter in $ns
wait_rm_addr()
{
	local ns="${1}"
	local old_cnt="${2}"
	local cnt
	local i

	for i in $(seq 10); do
		cnt=$(rm_addr_count ${ns})
		[ "$cnt" = "${old_cnt}" ] || break
		sleep 0.1
	done
}

pm_nl_set_limits()
{
	local ns=$1
	local addrs=$2
	local subflows=$3

	if [ $ip_mptcp -eq 1 ]; then
		ip -n $ns mptcp limits set add_addr_accepted $addrs subflows $subflows
	else
		ip netns exec $ns ./pm_nl_ctl limits $addrs $subflows
	fi
}

pm_nl_add_endpoint()
{
	local ns=$1
	local addr=$2
	local flags
	local port
	local dev
	local id
	local nr=2

	for p in $@
	do
		if [ $p = "flags" ]; then
			eval _flags=\$"$nr"
			[ ! -z $_flags ]; flags="flags $_flags"
		fi
		if [ $p = "dev" ]; then
			eval _dev=\$"$nr"
			[ ! -z $_dev ]; dev="dev $_dev"
		fi
		if [ $p = "id" ]; then
			eval _id=\$"$nr"
			[ ! -z $_id ]; id="id $_id"
		fi
		if [ $p = "port" ]; then
			eval _port=\$"$nr"
			[ ! -z $_port ]; port="port $_port"
		fi

		let nr+=1
	done

	if [ $ip_mptcp -eq 1 ]; then
		ip -n $ns mptcp endpoint add $addr ${_flags//","/" "} $dev $id $port
	else
		ip netns exec $ns ./pm_nl_ctl add $addr $flags $dev $id $port
	fi
}

pm_nl_del_endpoint()
{
	local ns=$1
	local id=$2
	local addr=$3

	if [ $ip_mptcp -eq 1 ]; then
		ip -n $ns mptcp endpoint delete id $id $addr
	else
		ip netns exec $ns ./pm_nl_ctl del $id $addr
	fi
}

pm_nl_flush_endpoint()
{
	local ns=$1

	if [ $ip_mptcp -eq 1 ]; then
		ip -n $ns mptcp endpoint flush
	else
		ip netns exec $ns ./pm_nl_ctl flush
	fi
}

pm_nl_show_endpoints()
{
	local ns=$1

	if [ $ip_mptcp -eq 1 ]; then
		ip -n $ns mptcp endpoint show
	else
		ip netns exec $ns ./pm_nl_ctl dump
	fi
}

pm_nl_change_endpoint()
{
	local ns=$1
	local id=$2
	local flags=$3

	if [ $ip_mptcp -eq 1 ]; then
		ip -n $ns mptcp endpoint change id $id ${flags//","/" "}
	else
		ip netns exec $ns ./pm_nl_ctl set id $id flags $flags
	fi
}

do_transfer()
{
	listener_ns="$1"
	connector_ns="$2"
	cl_proto="$3"
	srv_proto="$4"
	connect_addr="$5"
	test_link_fail="$6"
	addr_nr_ns1="$7"
	addr_nr_ns2="$8"
	speed="$9"
	sflags="${10}"

	port=$((10000+$TEST_COUNT))
	TEST_COUNT=$((TEST_COUNT+1))

	:> "$cout"
	:> "$sout"
	:> "$capout"

	if [ $capture -eq 1 ]; then
		if [ -z $SUDO_USER ] ; then
			capuser=""
		else
			capuser="-Z $SUDO_USER"
		fi

		capfile=$(printf "mp_join-%02u-%s.pcap" "$TEST_COUNT" "${listener_ns}")

		echo "Capturing traffic for test $TEST_COUNT into $capfile"
		ip netns exec ${listener_ns} tcpdump -i any -s 65535 -B 32768 $capuser -w $capfile > "$capout" 2>&1 &
		cappid=$!

		sleep 1
	fi

	NSTAT_HISTORY=/tmp/${listener_ns}.nstat ip netns exec ${listener_ns} \
		nstat -n
	NSTAT_HISTORY=/tmp/${connector_ns}.nstat ip netns exec ${connector_ns} \
		nstat -n

	local extra_args
	if [ $speed = "fast" ]; then
		extra_args="-j"
	elif [ $speed = "slow" ]; then
		extra_args="-r 50"
	elif [[ $speed = "speed_"* ]]; then
		extra_args="-r ${speed:6}"
	fi

	if [[ "${addr_nr_ns2}" = "fastclose_"* ]]; then
		# disconnect
		extra_args="$extra_args -I ${addr_nr_ns2:10}"
		addr_nr_ns2=0
	fi

	local local_addr
	if is_v6 "${connect_addr}"; then
		local_addr="::"
	else
		local_addr="0.0.0.0"
	fi

	if [ "$test_link_fail" -gt 1 ];then
		timeout ${timeout_test} \
			ip netns exec ${listener_ns} \
				./mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
					$extra_args ${local_addr} < "$sinfail" > "$sout" &
	else
		timeout ${timeout_test} \
			ip netns exec ${listener_ns} \
				./mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
					$extra_args ${local_addr} < "$sin" > "$sout" &
	fi
	spid=$!

	wait_local_port_listen "${listener_ns}" "${port}"

	if [ "$test_link_fail" -eq 0 ];then
		timeout ${timeout_test} \
			ip netns exec ${connector_ns} \
				./mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
					$extra_args $connect_addr < "$cin" > "$cout" &
	elif [ "$test_link_fail" -eq 1 ] || [ "$test_link_fail" -eq 2 ];then
		( cat "$cinfail" ; sleep 2; link_failure $listener_ns ; cat "$cinfail" ) | \
			tee "$cinsent" | \
			timeout ${timeout_test} \
				ip netns exec ${connector_ns} \
					./mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
						$extra_args $connect_addr > "$cout" &
	else
		cat "$cinfail" | tee "$cinsent" | \
			timeout ${timeout_test} \
				ip netns exec ${connector_ns} \
					./mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
						$extra_args $connect_addr > "$cout" &
	fi
	cpid=$!

	# let the mptcp subflow be established in background before
	# do endpoint manipulation
	[ $addr_nr_ns1 = "0" -a $addr_nr_ns2 = "0" ] || sleep 1

	if [ $addr_nr_ns1 -gt 0 ]; then
		let add_nr_ns1=addr_nr_ns1
		counter=2
		while [ $add_nr_ns1 -gt 0 ]; do
			local addr
			if is_v6 "${connect_addr}"; then
				addr="dead:beef:$counter::1"
			else
				addr="10.0.$counter.1"
			fi
			pm_nl_add_endpoint $ns1 $addr flags signal
			let counter+=1
			let add_nr_ns1-=1
		done
	elif [ $addr_nr_ns1 -lt 0 ]; then
		let rm_nr_ns1=-addr_nr_ns1
		if [ $rm_nr_ns1 -lt 8 ]; then
			counter=0
			pm_nl_show_endpoints ${listener_ns} | while read line; do
				local arr=($line)
				local nr=0

				for i in ${arr[@]}; do
					if [ $i = "id" ]; then
						if [ $counter -eq $rm_nr_ns1 ]; then
							break
						fi
						id=${arr[$nr+1]}
						rm_addr=$(rm_addr_count ${connector_ns})
						pm_nl_del_endpoint ${listener_ns} $id
						wait_rm_addr ${connector_ns} ${rm_addr}
						let counter+=1
					fi
					let nr+=1
				done
			done
		elif [ $rm_nr_ns1 -eq 8 ]; then
			pm_nl_flush_endpoint ${listener_ns}
		elif [ $rm_nr_ns1 -eq 9 ]; then
			pm_nl_del_endpoint ${listener_ns} 0 ${connect_addr}
		fi
	fi

	flags="subflow"
	if [[ "${addr_nr_ns2}" = "fullmesh_"* ]]; then
		flags="${flags},fullmesh"
		addr_nr_ns2=${addr_nr_ns2:9}
	fi

	# if newly added endpoints must be deleted, give the background msk
	# some time to created them
	[ $addr_nr_ns1 -gt 0 -a $addr_nr_ns2 -lt 0 ] && sleep 1

	if [ $addr_nr_ns2 -gt 0 ]; then
		let add_nr_ns2=addr_nr_ns2
		counter=3
		while [ $add_nr_ns2 -gt 0 ]; do
			local addr
			if is_v6 "${connect_addr}"; then
				addr="dead:beef:$counter::2"
			else
				addr="10.0.$counter.2"
			fi
			pm_nl_add_endpoint $ns2 $addr flags $flags
			let counter+=1
			let add_nr_ns2-=1
		done
	elif [ $addr_nr_ns2 -lt 0 ]; then
		let rm_nr_ns2=-addr_nr_ns2
		if [ $rm_nr_ns2 -lt 8 ]; then
			counter=0
			pm_nl_show_endpoints ${connector_ns} | while read line; do
				local arr=($line)
				local nr=0

				for i in ${arr[@]}; do
					if [ $i = "id" ]; then
						if [ $counter -eq $rm_nr_ns2 ]; then
							break
						fi
						# rm_addr are serialized, allow the previous one to
						# complete
						id=${arr[$nr+1]}
						rm_addr=$(rm_addr_count ${listener_ns})
						pm_nl_del_endpoint ${connector_ns} $id
						wait_rm_addr ${listener_ns} ${rm_addr}
						let counter+=1
					fi
					let nr+=1
				done
			done
		elif [ $rm_nr_ns2 -eq 8 ]; then
			pm_nl_flush_endpoint ${connector_ns}
		elif [ $rm_nr_ns2 -eq 9 ]; then
			local addr
			if is_v6 "${connect_addr}"; then
				addr="dead:beef:1::2"
			else
				addr="10.0.1.2"
			fi
			pm_nl_del_endpoint ${connector_ns} 0 $addr
		fi
	fi

	if [ ! -z $sflags ]; then
		sleep 1
		for netns in "$ns1" "$ns2"; do
			pm_nl_show_endpoints $netns | while read line; do
				local arr=($line)
				local nr=0
				local id

				for i in ${arr[@]}; do
					if [ $i = "id" ]; then
						id=${arr[$nr+1]}
					fi
					let nr+=1
				done
				pm_nl_change_endpoint $netns $id $sflags
			done
		done
	fi

	wait $cpid
	retc=$?
	wait $spid
	rets=$?

	if [ $capture -eq 1 ]; then
	    sleep 1
	    kill $cappid
	fi

	NSTAT_HISTORY=/tmp/${listener_ns}.nstat ip netns exec ${listener_ns} \
		nstat | grep Tcp > /tmp/${listener_ns}.out
	NSTAT_HISTORY=/tmp/${connector_ns}.nstat ip netns exec ${connector_ns} \
		nstat | grep Tcp > /tmp/${connector_ns}.out

	if [ ${rets} -ne 0 ] || [ ${retc} -ne 0 ]; then
		echo " client exit code $retc, server $rets" 1>&2
		echo -e "\nnetns ${listener_ns} socket stat for ${port}:" 1>&2
		ip netns exec ${listener_ns} ss -Menita 1>&2 -o "sport = :$port"
		cat /tmp/${listener_ns}.out
		echo -e "\nnetns ${connector_ns} socket stat for ${port}:" 1>&2
		ip netns exec ${connector_ns} ss -Menita 1>&2 -o "dport = :$port"
		cat /tmp/${connector_ns}.out

		cat "$capout"
		ret=1
		return 1
	fi

	if [ "$test_link_fail" -gt 1 ];then
		check_transfer $sinfail $cout "file received by client"
	else
		check_transfer $sin $cout "file received by client"
	fi
	retc=$?
	if [ "$test_link_fail" -eq 0 ];then
		check_transfer $cin $sout "file received by server"
	else
		check_transfer $cinsent $sout "file received by server"
	fi
	rets=$?

	if [ $retc -eq 0 ] && [ $rets -eq 0 ];then
		cat "$capout"
		return 0
	fi

	cat "$capout"
	return 1
}

make_file()
{
	name=$1
	who=$2
	size=$3

	dd if=/dev/urandom of="$name" bs=1024 count=$size 2> /dev/null
	echo -e "\nMPTCP_TEST_FILE_END_MARKER" >> "$name"

	echo "Created $name (size $size KB) containing data sent by $who"
}

run_tests()
{
	listener_ns="$1"
	connector_ns="$2"
	connect_addr="$3"
	test_linkfail="${4:-0}"
	addr_nr_ns1="${5:-0}"
	addr_nr_ns2="${6:-0}"
	speed="${7:-fast}"
	sflags="${8:-""}"

	# The values above 2 are reused to make test files
	# with the given sizes (KB)
	if [ "$test_linkfail" -gt 2 ]; then
		size=$test_linkfail

		if [ -z "$cinfail" ]; then
			cinfail=$(mktemp)
		fi
		make_file "$cinfail" "client" $size
	# create the input file for the failure test when
	# the first failure test run
	elif [ "$test_linkfail" -ne 0 -a -z "$cinfail" ]; then
		# the client file must be considerably larger
		# of the maximum expected cwin value, or the
		# link utilization will be not predicable
		size=$((RANDOM%2))
		size=$((size+1))
		size=$((size*8192))
		size=$((size + ( $RANDOM % 8192) ))

		cinfail=$(mktemp)
		make_file "$cinfail" "client" $size
	fi

	if [ "$test_linkfail" -gt 2 ]; then
		size=$test_linkfail

		if [ -z "$sinfail" ]; then
			sinfail=$(mktemp)
		fi
		make_file "$sinfail" "server" $size
	elif [ "$test_linkfail" -eq 2 -a -z "$sinfail" ]; then
		size=$((RANDOM%16))
		size=$((size+1))
		size=$((size*2048))

		sinfail=$(mktemp)
		make_file "$sinfail" "server" $size
	fi

	do_transfer ${listener_ns} ${connector_ns} MPTCP MPTCP ${connect_addr} \
		${test_linkfail} ${addr_nr_ns1} ${addr_nr_ns2} ${speed} ${sflags}
}

dump_stats()
{
	echo Server ns stats
	ip netns exec $ns1 nstat -as | grep Tcp
	echo Client ns stats
	ip netns exec $ns2 nstat -as | grep Tcp
}

chk_csum_nr()
{
	local msg=${1:-""}
	local csum_ns1=${2:-0}
	local csum_ns2=${3:-0}
	local count
	local dump_stats
	local allow_multi_errors_ns1=0
	local allow_multi_errors_ns2=0

	if [[ "${csum_ns1}" = "+"* ]]; then
		allow_multi_errors_ns1=1
		csum_ns1=${csum_ns1:1}
	fi
	if [[ "${csum_ns2}" = "+"* ]]; then
		allow_multi_errors_ns2=1
		csum_ns2=${csum_ns2:1}
	fi

	if [ ! -z "$msg" ]; then
		printf "%03u" "$TEST_COUNT"
	else
		echo -n "   "
	fi
	printf " %-36s %s" "$msg" "sum"
	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != $csum_ns1 -a $allow_multi_errors_ns1 -eq 0 ] ||
	   [ "$count" -lt $csum_ns1 -a $allow_multi_errors_ns1 -eq 1 ]; then
		echo "[fail] got $count data checksum error[s] expected $csum_ns1"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi
	echo -n " - csum  "
	count=`ip netns exec $ns2 nstat -as | grep MPTcpExtDataCsumErr | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != $csum_ns2 -a $allow_multi_errors_ns2 -eq 0 ] ||
	   [ "$count" -lt $csum_ns2 -a $allow_multi_errors_ns2 -eq 1 ]; then
		echo "[fail] got $count data checksum error[s] expected $csum_ns2"
		ret=1
		dump_stats=1
	else
		echo "[ ok ]"
	fi
	[ "${dump_stats}" = 1 ] && dump_stats
}

chk_fail_nr()
{
	local fail_tx=$1
	local fail_rx=$2
	local count
	local dump_stats

	printf "%-${nr_blank}s %s" " " "ftx"
	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPFailTx | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$fail_tx" ]; then
		echo "[fail] got $count MP_FAIL[s] TX expected $fail_tx"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	echo -n " - failrx"
	count=`ip netns exec $ns2 nstat -as | grep MPTcpExtMPFailRx | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$fail_rx" ]; then
		echo "[fail] got $count MP_FAIL[s] RX expected $fail_rx"
		ret=1
		dump_stats=1
	else
		echo "[ ok ]"
	fi

	[ "${dump_stats}" = 1 ] && dump_stats
}

chk_fclose_nr()
{
	local fclose_tx=$1
	local fclose_rx=$2
	local count
	local dump_stats

	printf "%-${nr_blank}s %s" " " "ctx"
	count=$(ip netns exec $ns2 nstat -as | grep MPTcpExtMPFastcloseTx | awk '{print $2}')
	[ -z "$count" ] && count=0
	if [ "$count" != "$fclose_tx" ]; then
		echo "[fail] got $count MP_FASTCLOSE[s] TX expected $fclose_tx"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	echo -n " - fclzrx"
	count=$(ip netns exec $ns1 nstat -as | grep MPTcpExtMPFastcloseRx | awk '{print $2}')
	[ -z "$count" ] && count=0
	if [ "$count" != "$fclose_rx" ]; then
		echo "[fail] got $count MP_FASTCLOSE[s] RX expected $fclose_rx"
		ret=1
		dump_stats=1
	else
		echo "[ ok ]"
	fi

	[ "${dump_stats}" = 1 ] && dump_stats
}

chk_rst_nr()
{
	local rst_tx=$1
	local rst_rx=$2
	local ns_invert=${3:-""}
	local count
	local dump_stats
	local ns_tx=$ns1
	local ns_rx=$ns2
	local extra_msg=""

	if [[ $ns_invert = "invert" ]]; then
		ns_tx=$ns2
		ns_rx=$ns1
		extra_msg="   invert"
	fi

	printf "%-${nr_blank}s %s" " " "rtx"
	count=$(ip netns exec $ns_tx nstat -as | grep MPTcpExtMPRstTx | awk '{print $2}')
	[ -z "$count" ] && count=0
	if [ "$count" != "$rst_tx" ]; then
		echo "[fail] got $count MP_RST[s] TX expected $rst_tx"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	echo -n " - rstrx "
	count=$(ip netns exec $ns_rx nstat -as | grep MPTcpExtMPRstRx | awk '{print $2}')
	[ -z "$count" ] && count=0
	if [ "$count" != "$rst_rx" ]; then
		echo "[fail] got $count MP_RST[s] RX expected $rst_rx"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	[ "${dump_stats}" = 1 ] && dump_stats

	echo "$extra_msg"
}

chk_join_nr()
{
	local msg="$1"
	local syn_nr=$2
	local syn_ack_nr=$3
	local ack_nr=$4
	local csum_ns1=${5:-0}
	local csum_ns2=${6:-0}
	local fail_nr=${7:-0}
	local rst_nr=${8:-0}
	local count
	local dump_stats
	local with_cookie

	printf "%03u %-36s %s" "$TEST_COUNT" "$msg" "syn"
	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinSynRx | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$syn_nr" ]; then
		echo "[fail] got $count JOIN[s] syn expected $syn_nr"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	echo -n " - synack"
	with_cookie=`ip netns exec $ns2 sysctl -n net.ipv4.tcp_syncookies`
	count=`ip netns exec $ns2 nstat -as | grep MPTcpExtMPJoinSynAckRx | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$syn_ack_nr" ]; then
		# simult connections exceeding the limit with cookie enabled could go up to
		# synack validation as the conn limit can be enforced reliably only after
		# the subflow creation
		if [ "$with_cookie" = 2 ] && [ "$count" -gt "$syn_ack_nr" ] && [ "$count" -le "$syn_nr" ]; then
			echo -n "[ ok ]"
		else
			echo "[fail] got $count JOIN[s] synack expected $syn_ack_nr"
			ret=1
			dump_stats=1
		fi
	else
		echo -n "[ ok ]"
	fi

	echo -n " - ack"
	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinAckRx | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$ack_nr" ]; then
		echo "[fail] got $count JOIN[s] ack expected $ack_nr"
		ret=1
		dump_stats=1
	else
		echo "[ ok ]"
	fi
	[ "${dump_stats}" = 1 ] && dump_stats
	if [ $checksum -eq 1 ]; then
		chk_csum_nr "" $csum_ns1 $csum_ns2
		chk_fail_nr $fail_nr $fail_nr
		chk_rst_nr $rst_nr $rst_nr
	fi
}

# a negative value for 'stale_max' means no upper bound:
# for bidirectional transfer, if one peer sleep for a while
# - as these tests do - we can have a quite high number of
# stale/recover conversions, proportional to
# sleep duration/ MPTCP-level RTX interval.
chk_stale_nr()
{
	local ns=$1
	local stale_min=$2
	local stale_max=$3
	local stale_delta=$4
	local dump_stats
	local stale_nr
	local recover_nr

	printf "%-${nr_blank}s %-18s" " " "stale"
	stale_nr=`ip netns exec $ns nstat -as | grep MPTcpExtSubflowStale | awk '{print $2}'`
	[ -z "$stale_nr" ] && stale_nr=0
	recover_nr=`ip netns exec $ns nstat -as | grep MPTcpExtSubflowRecover | awk '{print $2}'`
	[ -z "$recover_nr" ] && recover_nr=0

	if [ $stale_nr -lt $stale_min ] ||
	   [ $stale_max -gt 0 -a $stale_nr -gt $stale_max ] ||
	   [ $((stale_nr - $recover_nr)) -ne $stale_delta ]; then
		echo "[fail] got $stale_nr stale[s] $recover_nr recover[s], " \
		     " expected stale in range [$stale_min..$stale_max]," \
		     " stale-recover delta $stale_delta "
		ret=1
		dump_stats=1
	else
		echo "[ ok ]"
	fi

	if [ "${dump_stats}" = 1 ]; then
		echo $ns stats
		ip netns exec $ns ip -s link show
		ip netns exec $ns nstat -as | grep MPTcp
	fi
}

chk_add_nr()
{
	local add_nr=$1
	local echo_nr=$2
	local port_nr=${3:-0}
	local syn_nr=${4:-$port_nr}
	local syn_ack_nr=${5:-$port_nr}
	local ack_nr=${6:-$port_nr}
	local mis_syn_nr=${7:-0}
	local mis_ack_nr=${8:-0}
	local count
	local dump_stats
	local timeout

	timeout=`ip netns exec $ns1 sysctl -n net.mptcp.add_addr_timeout`

	printf "%-${nr_blank}s %s" " " "add"
	count=`ip netns exec $ns2 nstat -as MPTcpExtAddAddr | grep MPTcpExtAddAddr | awk '{print $2}'`
	[ -z "$count" ] && count=0

	# if the test configured a short timeout tolerate greater then expected
	# add addrs options, due to retransmissions
	if [ "$count" != "$add_nr" ] && [ "$timeout" -gt 1 -o "$count" -lt "$add_nr" ]; then
		echo "[fail] got $count ADD_ADDR[s] expected $add_nr"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	echo -n " - echo  "
	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtEchoAdd | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$echo_nr" ]; then
		echo "[fail] got $count ADD_ADDR echo[s] expected $echo_nr"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	if [ $port_nr -gt 0 ]; then
		echo -n " - pt "
		count=`ip netns exec $ns2 nstat -as | grep MPTcpExtPortAdd | awk '{print $2}'`
		[ -z "$count" ] && count=0
		if [ "$count" != "$port_nr" ]; then
			echo "[fail] got $count ADD_ADDR[s] with a port-number expected $port_nr"
			ret=1
			dump_stats=1
		else
			echo "[ ok ]"
		fi

		printf "%-${nr_blank}s %s" " " "syn"
		count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinPortSynRx |
			awk '{print $2}'`
		[ -z "$count" ] && count=0
		if [ "$count" != "$syn_nr" ]; then
			echo "[fail] got $count JOIN[s] syn with a different \
				port-number expected $syn_nr"
			ret=1
			dump_stats=1
		else
			echo -n "[ ok ]"
		fi

		echo -n " - synack"
		count=`ip netns exec $ns2 nstat -as | grep MPTcpExtMPJoinPortSynAckRx |
			awk '{print $2}'`
		[ -z "$count" ] && count=0
		if [ "$count" != "$syn_ack_nr" ]; then
			echo "[fail] got $count JOIN[s] synack with a different \
				port-number expected $syn_ack_nr"
			ret=1
			dump_stats=1
		else
			echo -n "[ ok ]"
		fi

		echo -n " - ack"
		count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPJoinPortAckRx |
			awk '{print $2}'`
		[ -z "$count" ] && count=0
		if [ "$count" != "$ack_nr" ]; then
			echo "[fail] got $count JOIN[s] ack with a different \
				port-number expected $ack_nr"
			ret=1
			dump_stats=1
		else
			echo "[ ok ]"
		fi

		printf "%-${nr_blank}s %s" " " "syn"
		count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMismatchPortSynRx |
			awk '{print $2}'`
		[ -z "$count" ] && count=0
		if [ "$count" != "$mis_syn_nr" ]; then
			echo "[fail] got $count JOIN[s] syn with a mismatched \
				port-number expected $mis_syn_nr"
			ret=1
			dump_stats=1
		else
			echo -n "[ ok ]"
		fi

		echo -n " - ack   "
		count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMismatchPortAckRx |
			awk '{print $2}'`
		[ -z "$count" ] && count=0
		if [ "$count" != "$mis_ack_nr" ]; then
			echo "[fail] got $count JOIN[s] ack with a mismatched \
				port-number expected $mis_ack_nr"
			ret=1
			dump_stats=1
		else
			echo "[ ok ]"
		fi
	else
		echo ""
	fi

	[ "${dump_stats}" = 1 ] && dump_stats
}

chk_rm_nr()
{
	local rm_addr_nr=$1
	local rm_subflow_nr=$2
	local invert=${3:-""}
	local count
	local dump_stats
	local addr_ns=$ns1
	local subflow_ns=$ns2
	local extra_msg=""

	if [[ $invert = "invert" ]]; then
		addr_ns=$ns2
		subflow_ns=$ns1
		extra_msg="   invert"
	fi

	printf "%-${nr_blank}s %s" " " "rm "
	count=`ip netns exec $addr_ns nstat -as | grep MPTcpExtRmAddr | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$rm_addr_nr" ]; then
		echo "[fail] got $count RM_ADDR[s] expected $rm_addr_nr"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	echo -n " - rmsf  "
	count=`ip netns exec $subflow_ns nstat -as | grep MPTcpExtRmSubflow | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$rm_subflow_nr" ]; then
		echo "[fail] got $count RM_SUBFLOW[s] expected $rm_subflow_nr"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	[ "${dump_stats}" = 1 ] && dump_stats

	echo "$extra_msg"
}

chk_prio_nr()
{
	local mp_prio_nr_tx=$1
	local mp_prio_nr_rx=$2
	local count
	local dump_stats

	printf "%-${nr_blank}s %s" " " "ptx"
	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPPrioTx | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$mp_prio_nr_tx" ]; then
		echo "[fail] got $count MP_PRIO[s] TX expected $mp_prio_nr_tx"
		ret=1
		dump_stats=1
	else
		echo -n "[ ok ]"
	fi

	echo -n " - prx   "
	count=`ip netns exec $ns1 nstat -as | grep MPTcpExtMPPrioRx | awk '{print $2}'`
	[ -z "$count" ] && count=0
	if [ "$count" != "$mp_prio_nr_rx" ]; then
		echo "[fail] got $count MP_PRIO[s] RX expected $mp_prio_nr_rx"
		ret=1
		dump_stats=1
	else
		echo "[ ok ]"
	fi

	[ "${dump_stats}" = 1 ] && dump_stats
}

chk_link_usage()
{
	local ns=$1
	local link=$2
	local out=$3
	local expected_rate=$4
	local tx_link=`ip netns exec $ns cat /sys/class/net/$link/statistics/tx_bytes`
	local tx_total=`ls -l $out | awk '{print $5}'`
	local tx_rate=$((tx_link * 100 / $tx_total))
	local tolerance=5

	printf "%-${nr_blank}s %-18s" " " "link usage"
	if [ $tx_rate -lt $((expected_rate - $tolerance)) -o \
	     $tx_rate -gt $((expected_rate + $tolerance)) ]; then
		echo "[fail] got $tx_rate% usage, expected $expected_rate%"
		ret=1
	else
		echo "[ ok ]"
	fi
}

wait_attempt_fail()
{
	local timeout_ms=$((timeout_poll * 1000))
	local time=0
	local ns=$1

	while [ $time -lt $timeout_ms ]; do
		local cnt=$(ip netns exec $ns nstat -as TcpAttemptFails | grep TcpAttemptFails | awk '{print $2}')

		[ "$cnt" = 1 ] && return 1
		time=$((time + 100))
		sleep 0.1
	done
	return 1
}

subflows_tests()
{
	reset
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "no JOIN" "0" "0" "0"

	# subflow limited by client
	reset
	pm_nl_set_limits $ns1 0 0
	pm_nl_set_limits $ns2 0 0
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow, limited by client" 0 0 0

	# subflow limited by server
	reset
	pm_nl_set_limits $ns1 0 0
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow, limited by server" 1 1 0

	# subflow
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow" 1 1 1

	# multiple subflows
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 0 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "multiple subflows" 2 2 2

	# multiple subflows limited by server
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "multiple subflows, limited by server" 2 2 1

	# single subflow, dev
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow dev ns2eth3
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow, dev" 1 1 1
}

subflows_error_tests()
{
	# If a single subflow is configured, and matches the MPC src
	# address, no additional subflow should be created
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
	chk_join_nr "no MPC reuse with single endpoint" 0 0 0

	# multiple subflows, with subflow creation error
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 0 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	ip netns exec $ns1 iptables -A INPUT -s 10.0.3.2 -p tcp -j REJECT
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
	chk_join_nr "multi subflows, with failing subflow" 1 1 1

	# multiple subflows, with subflow timeout on MPJ
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 0 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	ip netns exec $ns1 iptables -A INPUT -s 10.0.3.2 -p tcp -j DROP
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
	chk_join_nr "multi subflows, with subflow timeout" 1 1 1

	# multiple subflows, check that the endpoint corresponding to
	# closed subflow (due to reset) is not reused if additional
	# subflows are added later
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	ip netns exec $ns1 iptables -A INPUT -s 10.0.3.2 -p tcp -j REJECT
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow &

	# updates in the child shell do not have any effect here, we
	# need to bump the test counter for the above case
	TEST_COUNT=$((TEST_COUNT+1))

	# mpj subflow will be in TW after the reset
	wait_attempt_fail $ns2
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	wait

	# additional subflow could be created only if the PM select
	# the later endpoint, skipping the already used one
	chk_join_nr "multi subflows, fair usage on close" 1 1 1
}

signal_address_tests()
{
	# add_address, unused
	reset
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "unused signal address" 0 0 0
	chk_add_nr 1 1

	# accept and use add_addr
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal address" 1 1 1
	chk_add_nr 1 1

	# accept and use add_addr with an additional subflow
	# note: signal address in server ns and local addresses in client ns must
	# belong to different subnets or one of the listed local address could be
	# used for 'add_addr' subflow
	reset
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 1 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "subflow and signal" 2 2 2
	chk_add_nr 1 1

	# accept and use add_addr with additional subflows
	reset
	pm_nl_set_limits $ns1 0 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 3
	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 "multiple subflows and signal" 3 3 3
	chk_add_nr 1 1

	# signal addresses
	reset
	pm_nl_set_limits $ns1 3 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.4.1 flags signal
	pm_nl_set_limits $ns2 3 3
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal addresses" 3 3 3
	chk_add_nr 3 3

	# signal invalid addresses
	reset
	pm_nl_set_limits $ns1 3 3
	pm_nl_add_endpoint $ns1 10.0.12.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.14.1 flags signal
	pm_nl_set_limits $ns2 3 3
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal invalid addresses" 1 1 1
	chk_add_nr 3 3

	# signal addresses race test
	reset
	pm_nl_set_limits $ns1 4 4
	pm_nl_set_limits $ns2 4 4
	pm_nl_add_endpoint $ns1 10.0.1.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.4.1 flags signal
	pm_nl_add_endpoint $ns2 10.0.1.2 flags signal
	pm_nl_add_endpoint $ns2 10.0.2.2 flags signal
	pm_nl_add_endpoint $ns2 10.0.3.2 flags signal
	pm_nl_add_endpoint $ns2 10.0.4.2 flags signal

	# the peer could possibly miss some addr notification, allow retransmission
	ip netns exec $ns1 sysctl -q net.mptcp.add_addr_timeout=1
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
	chk_join_nr "signal addresses race test" 3 3 3

	# the server will not signal the address terminating
	# the MPC subflow
	chk_add_nr 3 3
}

link_failure_tests()
{
	# accept and use add_addr with additional subflows and link loss
	reset

	# without any b/w limit each veth could spool the packets and get
	# them acked at xmit time, so that the corresponding subflow will
	# have almost always no outstanding pkts, the scheduler will pick
	# always the first subflow and we will have hard time testing
	# active backup and link switch-over.
	# Let's set some arbitrary (low) virtual link limits.
	init_shapers
	pm_nl_set_limits $ns1 0 3
	pm_nl_add_endpoint $ns1 10.0.2.1 dev ns1eth2 flags signal
	pm_nl_set_limits $ns2 1 3
	pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow
	pm_nl_add_endpoint $ns2 10.0.4.2 dev ns2eth4 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 1
	chk_join_nr "multiple flows, signal, link failure" 3 3 3
	chk_add_nr 1 1
	chk_stale_nr $ns2 1 5 1

	# accept and use add_addr with additional subflows and link loss
	# for bidirectional transfer
	reset
	init_shapers
	pm_nl_set_limits $ns1 0 3
	pm_nl_add_endpoint $ns1 10.0.2.1 dev ns1eth2 flags signal
	pm_nl_set_limits $ns2 1 3
	pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow
	pm_nl_add_endpoint $ns2 10.0.4.2 dev ns2eth4 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 2
	chk_join_nr "multi flows, signal, bidi, link fail" 3 3 3
	chk_add_nr 1 1
	chk_stale_nr $ns2 1 -1 1

	# 2 subflows plus 1 backup subflow with a lossy link, backup
	# will never be used
	reset
	init_shapers
	pm_nl_set_limits $ns1 0 2
	pm_nl_add_endpoint $ns1 10.0.2.1 dev ns1eth2 flags signal
	pm_nl_set_limits $ns2 1 2
	export FAILING_LINKS="1"
	pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow,backup
	run_tests $ns1 $ns2 10.0.1.1 1
	chk_join_nr "backup subflow unused, link failure" 2 2 2
	chk_add_nr 1 1
	chk_link_usage $ns2 ns2eth3 $cinsent 0

	# 2 lossy links after half transfer, backup will get half of
	# the traffic
	reset
	init_shapers
	pm_nl_set_limits $ns1 0 2
	pm_nl_add_endpoint $ns1 10.0.2.1 dev ns1eth2 flags signal
	pm_nl_set_limits $ns2 1 2
	pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow,backup
	export FAILING_LINKS="1 2"
	run_tests $ns1 $ns2 10.0.1.1 1
	chk_join_nr "backup flow used, multi links fail" 2 2 2
	chk_add_nr 1 1
	chk_stale_nr $ns2 2 4 2
	chk_link_usage $ns2 ns2eth3 $cinsent 50

	# use a backup subflow with the first subflow on a lossy link
	# for bidirectional transfer
	reset
	init_shapers
	pm_nl_set_limits $ns1 0 2
	pm_nl_add_endpoint $ns1 10.0.2.1 dev ns1eth2 flags signal
	pm_nl_set_limits $ns2 1 3
	pm_nl_add_endpoint $ns2 10.0.3.2 dev ns2eth3 flags subflow,backup
	run_tests $ns1 $ns2 10.0.1.1 2
	chk_join_nr "backup flow used, bidi, link failure" 2 2 2
	chk_add_nr 1 1
	chk_stale_nr $ns2 1 -1 2
	chk_link_usage $ns2 ns2eth3 $cinsent 50
}

add_addr_timeout_tests()
{
	# add_addr timeout
	reset_with_add_addr_timeout
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
	chk_join_nr "signal address, ADD_ADDR timeout" 1 1 1
	chk_add_nr 4 0

	# add_addr timeout IPv6
	reset_with_add_addr_timeout 6
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 dead:beef:2::1 flags signal
	run_tests $ns1 $ns2 dead:beef:1::1 0 0 0 slow
	chk_join_nr "signal address, ADD_ADDR6 timeout" 1 1 1
	chk_add_nr 4 0

	# signal addresses timeout
	reset_with_add_addr_timeout
	pm_nl_set_limits $ns1 2 2
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_set_limits $ns2 2 2
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 speed_10
	chk_join_nr "signal addresses, ADD_ADDR timeout" 2 2 2
	chk_add_nr 8 0

	# signal invalid addresses timeout
	reset_with_add_addr_timeout
	pm_nl_set_limits $ns1 2 2
	pm_nl_add_endpoint $ns1 10.0.12.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_set_limits $ns2 2 2
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 speed_10
	chk_join_nr "invalid address, ADD_ADDR timeout" 1 1 1
	chk_add_nr 8 0
}

remove_tests()
{
	# single subflow, remove
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 0 0 -1 slow
	chk_join_nr "remove single subflow" 1 1 1
	chk_rm_nr 1 1

	# multiple subflows, remove
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 0 2
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 0 0 -2 slow
	chk_join_nr "remove multiple subflows" 2 2 2
	chk_rm_nr 2 2

	# single address, remove
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 10.0.1.1 0 -1 0 slow
	chk_join_nr "remove single address" 1 1 1
	chk_add_nr 1 1
	chk_rm_nr 1 1 invert

	# subflow and signal, remove
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 0 -1 -1 slow
	chk_join_nr "remove subflow and signal" 2 2 2
	chk_add_nr 1 1
	chk_rm_nr 1 1

	# subflows and signal, remove
	reset
	pm_nl_set_limits $ns1 0 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 3
	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 0 -1 -2 slow
	chk_join_nr "remove subflows and signal" 3 3 3
	chk_add_nr 1 1
	chk_rm_nr 2 2

	# addresses remove
	reset
	pm_nl_set_limits $ns1 3 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal id 250
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.4.1 flags signal
	pm_nl_set_limits $ns2 3 3
	run_tests $ns1 $ns2 10.0.1.1 0 -3 0 slow
	chk_join_nr "remove addresses" 3 3 3
	chk_add_nr 3 3
	chk_rm_nr 3 3 invert

	# invalid addresses remove
	reset
	pm_nl_set_limits $ns1 3 3
	pm_nl_add_endpoint $ns1 10.0.12.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.14.1 flags signal
	pm_nl_set_limits $ns2 3 3
	run_tests $ns1 $ns2 10.0.1.1 0 -3 0 slow
	chk_join_nr "remove invalid addresses" 1 1 1
	chk_add_nr 3 3
	chk_rm_nr 3 1 invert

	# subflows and signal, flush
	reset
	pm_nl_set_limits $ns1 0 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 3
	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 0 -8 -8 slow
	chk_join_nr "flush subflows and signal" 3 3 3
	chk_add_nr 1 1
	chk_rm_nr 2 2

	# subflows flush
	reset
	pm_nl_set_limits $ns1 3 3
	pm_nl_set_limits $ns2 3 3
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow id 150
	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 0 -8 -8 slow
	chk_join_nr "flush subflows" 3 3 3
	chk_rm_nr 3 3

	# addresses flush
	reset
	pm_nl_set_limits $ns1 3 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal id 250
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.4.1 flags signal
	pm_nl_set_limits $ns2 3 3
	run_tests $ns1 $ns2 10.0.1.1 0 -8 -8 slow
	chk_join_nr "flush addresses" 3 3 3
	chk_add_nr 3 3
	chk_rm_nr 3 3 invert

	# invalid addresses flush
	reset
	pm_nl_set_limits $ns1 3 3
	pm_nl_add_endpoint $ns1 10.0.12.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
	pm_nl_add_endpoint $ns1 10.0.14.1 flags signal
	pm_nl_set_limits $ns2 3 3
	run_tests $ns1 $ns2 10.0.1.1 0 -8 0 slow
	chk_join_nr "flush invalid addresses" 1 1 1
	chk_add_nr 3 3
	chk_rm_nr 3 1 invert

	# remove id 0 subflow
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 0 0 -9 slow
	chk_join_nr "remove id 0 subflow" 1 1 1
	chk_rm_nr 1 1

	# remove id 0 address
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 10.0.1.1 0 -9 0 slow
	chk_join_nr "remove id 0 address" 1 1 1
	chk_add_nr 1 1
	chk_rm_nr 1 1 invert
}

add_tests()
{
	# add single subflow
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	run_tests $ns1 $ns2 10.0.1.1 0 0 1 slow
	chk_join_nr "add single subflow" 1 1 1

	# add signal address
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 10.0.1.1 0 1 0 slow
	chk_join_nr "add signal address" 1 1 1
	chk_add_nr 1 1

	# add multiple subflows
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 0 2
	run_tests $ns1 $ns2 10.0.1.1 0 0 2 slow
	chk_join_nr "add multiple subflows" 2 2 2

	# add multiple subflows IPv6
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 0 2
	run_tests $ns1 $ns2 dead:beef:1::1 0 0 2 slow
	chk_join_nr "add multiple subflows IPv6" 2 2 2

	# add multiple addresses IPv6
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 2 2
	run_tests $ns1 $ns2 dead:beef:1::1 0 2 0 slow
	chk_join_nr "add multiple addresses IPv6" 2 2 2
	chk_add_nr 2 2
}

ipv6_tests()
{
	# subflow IPv6
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 dead:beef:3::2 dev ns2eth3 flags subflow
	run_tests $ns1 $ns2 dead:beef:1::1 0 0 0 slow
	chk_join_nr "single subflow IPv6" 1 1 1

	# add_address, unused IPv6
	reset
	pm_nl_add_endpoint $ns1 dead:beef:2::1 flags signal
	run_tests $ns1 $ns2 dead:beef:1::1 0 0 0 slow
	chk_join_nr "unused signal address IPv6" 0 0 0
	chk_add_nr 1 1

	# signal address IPv6
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_add_endpoint $ns1 dead:beef:2::1 flags signal
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 dead:beef:1::1 0 0 0 slow
	chk_join_nr "single address IPv6" 1 1 1
	chk_add_nr 1 1

	# single address IPv6, remove
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_add_endpoint $ns1 dead:beef:2::1 flags signal
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 dead:beef:1::1 0 -1 0 slow
	chk_join_nr "remove single address IPv6" 1 1 1
	chk_add_nr 1 1
	chk_rm_nr 1 1 invert

	# subflow and signal IPv6, remove
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_add_endpoint $ns1 dead:beef:2::1 flags signal
	pm_nl_set_limits $ns2 1 2
	pm_nl_add_endpoint $ns2 dead:beef:3::2 dev ns2eth3 flags subflow
	run_tests $ns1 $ns2 dead:beef:1::1 0 -1 -1 slow
	chk_join_nr "remove subflow and signal IPv6" 2 2 2
	chk_add_nr 1 1
	chk_rm_nr 1 1
}

v4mapped_tests()
{
	# subflow IPv4-mapped to IPv4-mapped
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 "::ffff:10.0.3.2" flags subflow
	run_tests $ns1 $ns2 "::ffff:10.0.1.1"
	chk_join_nr "single subflow IPv4-mapped" 1 1 1

	# signal address IPv4-mapped with IPv4-mapped sk
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 "::ffff:10.0.2.1" flags signal
	run_tests $ns1 $ns2 "::ffff:10.0.1.1"
	chk_join_nr "signal address IPv4-mapped" 1 1 1
	chk_add_nr 1 1

	# subflow v4-map-v6
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 "::ffff:10.0.1.1"
	chk_join_nr "single subflow v4-map-v6" 1 1 1

	# signal address v4-map-v6
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	run_tests $ns1 $ns2 "::ffff:10.0.1.1"
	chk_join_nr "signal address v4-map-v6" 1 1 1
	chk_add_nr 1 1

	# subflow v6-map-v4
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 "::ffff:10.0.3.2" flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow v6-map-v4" 1 1 1

	# signal address v6-map-v4
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 "::ffff:10.0.2.1" flags signal
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal address v6-map-v4" 1 1 1
	chk_add_nr 1 1

	# no subflow IPv6 to v4 address
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 dead:beef:2::2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "no JOIN with diff families v4-v6" 0 0 0

	# no subflow IPv6 to v4 address even if v6 has a valid v4 at the end
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 dead:beef:2::10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "no JOIN with diff families v4-v6-2" 0 0 0

	# no subflow IPv4 to v6 address, no need to slow down too then
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 dead:beef:1::1
	chk_join_nr "no JOIN with diff families v6-v4" 0 0 0
}

backup_tests()
{
	# single subflow, backup
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow,backup
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow nobackup
	chk_join_nr "single subflow, backup" 1 1 1
	chk_prio_nr 0 1

	# single address, backup
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow backup
	chk_join_nr "single address, backup" 1 1 1
	chk_add_nr 1 1
	chk_prio_nr 1 0

	# single address with port, backup
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow backup
	chk_join_nr "single address with port, backup" 1 1 1
	chk_add_nr 1 1
	chk_prio_nr 1 0
}

add_addr_ports_tests()
{
	# signal address with port
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal address with port" 1 1 1
	chk_add_nr 1 1 1

	# subflow and signal with port
	reset
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 1 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "subflow and signal with port" 2 2 2
	chk_add_nr 1 1 1

	# single address with port, remove
	reset
	pm_nl_set_limits $ns1 0 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	pm_nl_set_limits $ns2 1 1
	run_tests $ns1 $ns2 10.0.1.1 0 -1 0 slow
	chk_join_nr "remove single address with port" 1 1 1
	chk_add_nr 1 1 1
	chk_rm_nr 1 1 invert

	# subflow and signal with port, remove
	reset
	pm_nl_set_limits $ns1 0 2
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	pm_nl_set_limits $ns2 1 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1 0 -1 -1 slow
	chk_join_nr "remove subflow and signal with port" 2 2 2
	chk_add_nr 1 1 1
	chk_rm_nr 1 1

	# subflows and signal with port, flush
	reset
	pm_nl_set_limits $ns1 0 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	pm_nl_set_limits $ns2 1 3
	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 0 -8 -2 slow
	chk_join_nr "flush subflows and signal with port" 3 3 3
	chk_add_nr 1 1
	chk_rm_nr 2 2

	# multiple addresses with port
	reset
	pm_nl_set_limits $ns1 2 2
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal port 10100
	pm_nl_set_limits $ns2 2 2
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "multiple addresses with port" 2 2 2
	chk_add_nr 2 2 2

	# multiple addresses with ports
	reset
	pm_nl_set_limits $ns1 2 2
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal port 10100
	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal port 10101
	pm_nl_set_limits $ns2 2 2
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "multiple addresses with ports" 2 2 2
	chk_add_nr 2 2 2
}

syncookies_tests()
{
	# single subflow, syncookies
	reset_with_cookies
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow with syn cookies" 1 1 1

	# multiple subflows with syn cookies
	reset_with_cookies
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 0 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "multiple subflows with syn cookies" 2 2 2

	# multiple subflows limited by server
	reset_with_cookies
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "subflows limited by server w cookies" 2 1 1

	# test signal address with cookies
	reset_with_cookies
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal address with syn cookies" 1 1 1
	chk_add_nr 1 1

	# test cookie with subflow and signal
	reset_with_cookies
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns1 0 2
	pm_nl_set_limits $ns2 1 2
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "subflow and signal w cookies" 2 2 2
	chk_add_nr 1 1

	# accept and use add_addr with additional subflows
	reset_with_cookies
	pm_nl_set_limits $ns1 0 3
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_set_limits $ns2 1 3
	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 "subflows and signal w. cookies" 3 3 3
	chk_add_nr 1 1
}

checksum_tests()
{
	# checksum test 0 0
	reset_with_checksum 0 0
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	run_tests $ns1 $ns2 10.0.1.1
	chk_csum_nr "checksum test 0 0"

	# checksum test 1 1
	reset_with_checksum 1 1
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	run_tests $ns1 $ns2 10.0.1.1
	chk_csum_nr "checksum test 1 1"

	# checksum test 0 1
	reset_with_checksum 0 1
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	run_tests $ns1 $ns2 10.0.1.1
	chk_csum_nr "checksum test 0 1"

	# checksum test 1 0
	reset_with_checksum 1 0
	pm_nl_set_limits $ns1 0 1
	pm_nl_set_limits $ns2 0 1
	run_tests $ns1 $ns2 10.0.1.1
	chk_csum_nr "checksum test 1 0"
}

deny_join_id0_tests()
{
	# subflow allow join id0 ns1
	reset_with_allow_join_id0 1 0
	pm_nl_set_limits $ns1 1 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow allow join id0 ns1" 1 1 1

	# subflow allow join id0 ns2
	reset_with_allow_join_id0 0 1
	pm_nl_set_limits $ns1 1 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "single subflow allow join id0 ns2" 0 0 0

	# signal address allow join id0 ns1
	# ADD_ADDRs are not affected by allow_join_id0 value.
	reset_with_allow_join_id0 1 0
	pm_nl_set_limits $ns1 1 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal address allow join id0 ns1" 1 1 1
	chk_add_nr 1 1

	# signal address allow join id0 ns2
	# ADD_ADDRs are not affected by allow_join_id0 value.
	reset_with_allow_join_id0 0 1
	pm_nl_set_limits $ns1 1 1
	pm_nl_set_limits $ns2 1 1
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "signal address allow join id0 ns2" 1 1 1
	chk_add_nr 1 1

	# subflow and address allow join id0 ns1
	reset_with_allow_join_id0 1 0
	pm_nl_set_limits $ns1 2 2
	pm_nl_set_limits $ns2 2 2
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "subflow and address allow join id0 1" 2 2 2

	# subflow and address allow join id0 ns2
	reset_with_allow_join_id0 0 1
	pm_nl_set_limits $ns1 2 2
	pm_nl_set_limits $ns2 2 2
	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow
	run_tests $ns1 $ns2 10.0.1.1
	chk_join_nr "subflow and address allow join id0 2" 1 1 1
}

fullmesh_tests()
{
	# fullmesh 1
	# 2 fullmesh addrs in ns2, added before the connection,
	# 1 non-fullmesh addr in ns1, added during the connection.
	reset
	pm_nl_set_limits $ns1 0 4
	pm_nl_set_limits $ns2 1 4
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow,fullmesh
	pm_nl_add_endpoint $ns2 10.0.3.2 flags subflow,fullmesh
	run_tests $ns1 $ns2 10.0.1.1 0 1 0 slow
	chk_join_nr "fullmesh test 2x1" 4 4 4
	chk_add_nr 1 1

	# fullmesh 2
	# 1 non-fullmesh addr in ns1, added before the connection,
	# 1 fullmesh addr in ns2, added during the connection.
	reset
	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
	run_tests $ns1 $ns2 10.0.1.1 0 0 fullmesh_1 slow
	chk_join_nr "fullmesh test 1x1" 3 3 3
	chk_add_nr 1 1

	# fullmesh 3
	# 1 non-fullmesh addr in ns1, added before the connection,
	# 2 fullmesh addrs in ns2, added during the connection.
	reset
	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
	run_tests $ns1 $ns2 10.0.1.1 0 0 fullmesh_2 slow
	chk_join_nr "fullmesh test 1x2" 5 5 5
	chk_add_nr 1 1

	# fullmesh 4
	# 1 non-fullmesh addr in ns1, added before the connection,
	# 2 fullmesh addrs in ns2, added during the connection,
	# limit max_subflows to 4.
	reset
	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
	run_tests $ns1 $ns2 10.0.1.1 0 0 fullmesh_2 slow
	chk_join_nr "fullmesh test 1x2, limited" 4 4 4
	chk_add_nr 1 1

	# set fullmesh flag
	reset
	pm_nl_set_limits $ns1 4 4
	pm_nl_add_endpoint $ns1 10.0.2.1 flags subflow
	pm_nl_set_limits $ns2 4 4
	run_tests $ns1 $ns2 10.0.1.1 0 0 1 slow fullmesh
	chk_join_nr "set fullmesh flag test" 2 2 2
	chk_rm_nr 0 1

	# set nofullmesh flag
	reset
	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
	run_tests $ns1 $ns2 10.0.1.1 0 0 fullmesh_1 slow nofullmesh
	chk_join_nr "set nofullmesh flag test" 2 2 2
	chk_rm_nr 0 1

	# set backup,fullmesh flags
	reset
	pm_nl_set_limits $ns1 4 4
	pm_nl_add_endpoint $ns1 10.0.2.1 flags subflow
	pm_nl_set_limits $ns2 4 4
	run_tests $ns1 $ns2 10.0.1.1 0 0 1 slow backup,fullmesh
	chk_join_nr "set backup,fullmesh flags test" 2 2 2
	chk_prio_nr 0 1
	chk_rm_nr 0 1

	# set nobackup,nofullmesh flags
	reset
	pm_nl_set_limits $ns1 4 4
	pm_nl_set_limits $ns2 4 4
	pm_nl_add_endpoint $ns2 10.0.2.2 flags subflow,backup,fullmesh
	run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow nobackup,nofullmesh
	chk_join_nr "set nobackup,nofullmesh flags test" 2 2 2
	chk_prio_nr 0 1
	chk_rm_nr 0 1
}

fastclose_tests()
{
	reset
	run_tests $ns1 $ns2 10.0.1.1 1024 0 fastclose_2
	chk_join_nr "fastclose test" 0 0 0
	chk_fclose_nr 1 1
	chk_rst_nr 1 1 invert
}

all_tests()
{
	subflows_tests
	subflows_error_tests
	signal_address_tests
	link_failure_tests
	add_addr_timeout_tests
	remove_tests
	add_tests
	ipv6_tests
	v4mapped_tests
	backup_tests
	add_addr_ports_tests
	syncookies_tests
	checksum_tests
	deny_join_id0_tests
	fullmesh_tests
	fastclose_tests
}

# [$1: error message]
usage()
{
	if [ -n "${1}" ]; then
		echo "${1}"
		ret=1
	fi

	echo "mptcp_join usage:"
	echo "  -f subflows_tests"
	echo "  -e subflows_error_tests"
	echo "  -s signal_address_tests"
	echo "  -l link_failure_tests"
	echo "  -t add_addr_timeout_tests"
	echo "  -r remove_tests"
	echo "  -a add_tests"
	echo "  -6 ipv6_tests"
	echo "  -4 v4mapped_tests"
	echo "  -b backup_tests"
	echo "  -p add_addr_ports_tests"
	echo "  -k syncookies_tests"
	echo "  -S checksum_tests"
	echo "  -d deny_join_id0_tests"
	echo "  -m fullmesh_tests"
	echo "  -z fastclose_tests"
	echo "  -c capture pcap files"
	echo "  -C enable data checksum"
	echo "  -i use ip mptcp"
	echo "  -h help"

	exit ${ret}
}


tests=()
while getopts 'fesltra64bpkdmchzCSi' opt; do
	case $opt in
		f)
			tests+=(subflows_tests)
			;;
		e)
			tests+=(subflows_error_tests)
			;;
		s)
			tests+=(signal_address_tests)
			;;
		l)
			tests+=(link_failure_tests)
			;;
		t)
			tests+=(add_addr_timeout_tests)
			;;
		r)
			tests+=(remove_tests)
			;;
		a)
			tests+=(add_tests)
			;;
		6)
			tests+=(ipv6_tests)
			;;
		4)
			tests+=(v4mapped_tests)
			;;
		b)
			tests+=(backup_tests)
			;;
		p)
			tests+=(add_addr_ports_tests)
			;;
		k)
			tests+=(syncookies_tests)
			;;
		S)
			tests+=(checksum_tests)
			;;
		d)
			tests+=(deny_join_id0_tests)
			;;
		m)
			tests+=(fullmesh_tests)
			;;
		z)
			tests+=(fastclose_tests)
			;;
		c)
			capture=1
			;;
		C)
			checksum=1
			;;
		i)
			ip_mptcp=1
			;;
		h)
			usage
			;;
		*)
			usage "Unknown option: -${opt}"
			;;
	esac
done

if [ ${#tests[@]} -eq 0 ]; then
	all_tests
else
	for subtests in "${tests[@]}"; do
		"${subtests}"
	done
fi

exit $ret