#!/bin/bash

# NFT_TEST_SKIP(NFT_TEST_SKIP_slow)

runtime=30

# allow stand-alone execution as well, e.g. '$0 3600'
if [ x"$1" != "x" ] ;then
	if [ -z "${NFT_TEST_HAVE_chain_binding+x}" ]; then
		NFT_TEST_HAVE_chain_binding=y
	fi
	if [ -z "${NFT_TEST_HAVE_pipapo+x}" ]; then
		NFT_TEST_HAVE_pipapo=y
	fi
	echo "running standalone with:"
	echo "NFT_TEST_HAVE_chain_binding="$NFT_TEST_HAVE_chain_binding
	echo "NFT_TEST_HAVE_pipapo="$NFT_TEST_HAVE_pipapo
	if [ $1 -ge 0 ]; then
		runtime="$1"
	else
		echo "Invalid runtime $1"
		exit 1
	fi
fi

if [ x = x"$NFT" ] ; then
	NFT=nft
fi

if [ "$NFT_TEST_HAS_SOCKET_LIMITS" = y ] ; then
	# The socket limit /proc/sys/net/core/wmem_max may be unsuitable for
	# the test.
	#
	# Skip it. You may ensure that the limits are suitable and rerun
	# with NFT_TEST_HAS_SOCKET_LIMITS=n.
	exit 77
fi

if [ -z "${NFT_TEST_HAVE_chain_binding+x}" ] ; then
	NFT_TEST_HAVE_chain_binding=n
	mydir="$(dirname "$0")"
	$NFT --check -f "$mydir/../../features/chain_binding.nft"
	if [ $? -eq 0 ];then
		NFT_TEST_HAVE_chain_binding=y
	else
		echo "Assuming anonymous chains are not supported"
	fi
fi

if [ "$NFT_TEST_HAVE_pipapo" != y ] ;then
	echo "Skipping pipapo set backend, kernel does not support it"
fi

testns=testns-$(mktemp -u "XXXXXXXX")
tmp=""

faultname="/proc/self/make-it-fail"
tables="foo bar"

failslab_defaults() {
	test -w $faultname || return

	# Disable fault injection unless process has 'make-it-fail' set
	echo Y > /sys/kernel/debug/failslab/task-filter

	# allow all slabs to fail (if process is tagged).
	find /sys/kernel/slab/ -wholename '*/kmalloc-[0-9]*/failslab' -type f -exec sh -c 'echo 1 > {}' \;

	# no limit on the number of failures, or clause works around old kernels that reject negative integer.
	echo -1 > /sys/kernel/debug/failslab/times 2>/dev/null || printf '%#x -1' > /sys/kernel/debug/failslab/times

	# Set to 2 for full dmesg traces for each injected error
	echo 0 > /sys/kernel/debug/failslab/verbose
}

failslab_random()
{
	r=$((RANDOM%2))

	if [ $r -eq 0 ]; then
		echo Y > /sys/kernel/debug/failslab/ignore-gfp-wait
	else
		echo N > /sys/kernel/debug/failslab/ignore-gfp-wait
	fi

	r=$((RANDOM%5))
	echo $r > /sys/kernel/debug/failslab/probability
	r=$((RANDOM%100))
	echo $r > /sys/kernel/debug/failslab/interval

	# allow a small initial 'success budget'.
	# failures only appear after this many allocated bytes.
	r=$((RANDOM%16384))
	echo $r > /sys/kernel/debug/$FAILTYPE/space
}

netns_del() {
	ip netns pids "$testns" | xargs kill 2>/dev/null
	ip netns del "$testns"
}

netns_add()
{
	ip netns add "$testns"
	ip -netns "$testns" link set lo up
}

cleanup() {
	[ "$tmp" = "" ] || rm -f "$tmp"
	netns_del
}

nft_with_fault_inject()
{
	file="$1"

	if [ -w "$faultname" ]; then
		failslab_random

		ip netns exec "$testns" bash -c "echo 1 > $faultname ; exec $NFT -f $file"
	fi

	ip netns exec "$testns" $NFT -f "$file"
}

trap cleanup EXIT
tmp=$(mktemp)

jump_or_goto()
{
	if [ $((RANDOM & 1)) -eq 0 ] ;then
		echo -n "jump"
	else
		echo -n "goto"
	fi
}

random_verdict()
{
	max="$1"

	if [ $max -eq 0 ]; then
		max=1
	fi

	rnd=$((RANDOM%max))

	if [ $rnd -gt 0 ];then
		jump_or_goto
		printf " chain%03u" "$((rnd+1))"
		return
	fi

	if [ $((RANDOM & 1)) -eq 0 ] ;then
		echo "accept"
	else
		echo "drop"
	fi
}

randsleep()
{
	local s=$((RANDOM%1))
	local ms=$((RANDOM%1000))
	sleep $s.$ms
}

randlist()
{
	while [ -r $tmp ]; do
		randsleep
		ip netns exec $testns $NFT list ruleset > /dev/null
	done
}

randflush()
{
	while [ -r $tmp ]; do
		randsleep
		ip netns exec $testns $NFT flush ruleset > /dev/null
	done
}

randdeltable()
{
	while [ -r $tmp ]; do
		randsleep
		for t in $tables; do
			r=$((RANDOM%10))

			if [ $r -eq 1 ] ;then
				ip netns exec $testns $NFT delete table inet $t
				randsleep
			fi
		done
	done
}

randdelset()
{
	while [ -r $tmp ]; do
		randsleep
		for t in $tables; do
			r=$((RANDOM%10))
			s=$((RANDOM%10))

			case $r in
			0)
				setname=set_$s
				;;
			1)
				setname=sett${s}
				;;
			2)
				setname=dmap_${s}
				;;
			3)
				setname=dmapt${s}
				;;
			4)
				setname=vmap_${s}
				;;
			5)
				setname=vmapt${s}
				;;
			*)
				continue
				;;
			esac

			if [ $r -eq 1 ] ;then
				ip netns exec $testns $NFT delete set inet $t $setname
			fi
		done
	done
}

randdelchain()
{
	while [ -r $tmp ]; do
		for t in $tables; do
			local c=$((RANDOM%100))
			randsleep
			chain=$(printf "chain%03u" "$c")

			local r=$((RANDOM%10))
			if [ $r -eq 1 ];then
				# chain can be invalid/unknown.
				ip netns exec $testns $NFT delete chain inet $t $chain
			fi
		done
	done
}

randdisable()
{
	while [ -r $tmp ]; do
		for t in $tables; do
			randsleep
			local r=$((RANDOM%10))
			if [ $r -eq 1 ];then
				ip netns exec $testns $NFT add table inet $t '{flags dormant; }'
				randsleep
				ip netns exec $testns $NFT add table inet $t '{ }'
			fi
		done
	done
}

randdelns()
{
	while [ -r $tmp ]; do
		randsleep
		netns_del
		netns_add
		randsleep
	done
}

available_flags()
{
	local -n available_flags=$1
	selected_key=$2
	if [ "$selected_key" == "single" ] ;then
		available_flags+=("interval")
	elif [ "$selected_key" == "concat" ] ;then
		if [ "$NFT_TEST_HAVE_pipapo" = y ] ;then
			available_flags+=("interval")
		fi
	fi
}

random_element_string=""

# create a random element.  Could cause any of the following:
# 1. Invalid set/map
# 2. Element already exists in set/map w. create
# 3. Element is new but wants to jump to unknown chain
# 4. Element already exsists in set/map w. add, but verdict (map data) differs
# 5. Element is created/added/deleted from 'flags constant' set.
random_elem()
{
	tr=$((RANDOM%2))
	t=0

	for table in $tables; do
		if [ $t -ne $tr ]; then
			t=$((t+1))
			continue
		fi

		kr=$((RANDOM%2))
		k=0
		cnt=0
		for key in "single" "concat"; do
			if [ $k -ne $kr ] ;then
				cnt=$((cnt+2))
				k=$((k+1))
				continue
			fi

			fr=$((RANDOM%2))
			f=0

			FLAGS=("")
			available_flags FLAGS $key
			for flags in "${FLAGS[@]}" ; do
				cnt=$((cnt+1))
				if [ $f -ne fkr ] ;then
					f=$((f+1))
					continue
				fi

				want="${key}${flags}"

				e=$((RANDOM%256))
				case "$want" in
				"single") element="10.1.1.$e"
					;;
				"concat") element="10.1.2.$e . $((RANDOM%65536))"
					;;
				"singleinterval") element="10.1.$e.0-10.1.$e.$e"
					;;
				"concatinterval") element="10.1.$e.0-10.1.$e.$e . $((RANDOM%65536))"
					;;
				*)	echo "bogus key $want"
					exit 111
					;;
				esac

				# This may result in invalid jump, but thats what we want.
				count=$(($RANDOM%100))

				r=$((RANDOM%7))
				case "$r" in
				0)
					random_element_string=" inet $table set_${cnt} { $element }"
					;;
				1)	random_element_string="inet $table sett${cnt} { $element timeout $((RANDOM%60))s }"
					;;
				2)	random_element_string="inet $table dmap_${cnt} { $element : $RANDOM }"
					;;
				3)	random_element_string="inet $table dmapt${cnt} { $element timeout $((RANDOM%60))s : $RANDOM }"
					;;
				4)	random_element_string="inet $table vmap_${cnt} { $element : `random_verdict $count` }"
					;;
				5)	random_element_string="inet $table vmapt${cnt} { $element timeout $((RANDOM%60))s : `random_verdict $count` }"
					;;
				6)	random_element_string="inet $table setc${cnt} { $element }"
					;;
				esac

				return
			done
		done
	done
}

randload()
{
	while [ -r $tmp ]; do
		random_element_string=""
		r=$((RANDOM%10))

		what=""
		case $r in
		1)
			(echo "flush ruleset"; cat "$tmp"
			 echo "insert rule inet foo INPUT meta nftrace set 1"
			 echo "insert rule inet foo OUTPUT meta nftrace set 1"
			) | nft_with_fault_inject "/dev/stdin"
			;;
		2)	what="add"
			;;
		3)	what="create"
			;;
		4)	what="delete"
			;;
		5)	what="destroy"
			;;
		6)	what="get"
			;;
		*)
			randsleep
			;;
		esac

		if [ x"$what" = "x" ]; then
			nft_with_fault_inject "$tmp"
		else
			# This can trigger abort path, for various reasons:
			# invalid set name
			# key mismatches set specification (concat vs. single value)
			# attempt to delete non-existent key
			# attempt to create dupliacte key
			# attempt to add duplicate key with non-matching value (data)
			# attempt to add new uniqeue key with a jump to an unknown chain
			random_elem
			( cat "$tmp"; echo "$what element $random_element_string") | nft_with_fault_inject "/dev/stdin"
		fi
	done
}

randmonitor()
{
	while [ -r $tmp ]; do
		randsleep
		timeout=$((RANDOM%16))
		timeout $((timeout+1)) $NFT monitor > /dev/null
	done
}

floodping() {
	cpunum=$(grep -c processor /proc/cpuinfo)
	cpunum=$((cpunum+1))

	while [ -r $tmp ]; do
		spawn=$((RANDOM%$cpunum))

		# spawn at most $cpunum processes. Or maybe none at all.
		i=0
		while [ $i -lt $spawn ]; do
			mask=$(printf 0x%x $((1<<$i)))
		        timeout 3 ip netns exec "$testns" taskset $mask ping -4 -fq 127.0.0.1 > /dev/null &
		        timeout 3 ip netns exec "$testns" taskset $mask ping -6 -fq ::1 > /dev/null &
			i=$((i+1))
		done

		wait
		randsleep
	done
}

stress_all()
{
	# if fault injection is enabled, first a quick test to trigger
	# abort paths without any parallel deletes/flushes.
	if [ -w $faultname ] ;then
		for i in $(seq 1 10);do
			nft_with_fault_inject "$tmp"
		done
	fi

	randlist &
	randflush &
	randdeltable &
	randdisable &
	randdelchain &
	randdelset &
	randdelns &
	randload &
	randmonitor &
}

gen_anon_chain_jump()
{
	echo -n "insert rule inet $@ "
	jump_or_goto

	if [ "$NFT_TEST_HAVE_chain_binding" = n ] ; then
		echo " defaultchain"
		return
	fi

	echo -n " { "
	jump_or_goto
	echo " defaultchain; counter; }"
}

gen_ruleset() {
echo > "$tmp"
for table in $tables; do
	count=$((RANDOM % 100))
	if [ $count -lt 1 ];then
		count=1
	fi

	echo add table inet "$table" >> "$tmp"
	echo flush table inet "$table" >> "$tmp"

	echo "add chain inet $table INPUT { type filter hook input priority 0; }" >> "$tmp"
	echo "add chain inet $table OUTPUT { type filter hook output priority 0; }" >> "$tmp"
	for c in $(seq 1 $count); do
		chain=$(printf "chain%03u" "$c")
		echo "add chain inet $table $chain" >> "$tmp"
	done

	echo "add chain inet $table defaultchain" >> "$tmp"

	for c in $(seq 1 $count); do
		chain=$(printf "chain%03u" "$c")
		for BASE in INPUT OUTPUT; do
			echo "add rule inet $table $BASE counter jump $chain" >> "$tmp"
		done
		if [ $((RANDOM%10)) -eq 1 ];then
			echo "add rule inet $table $chain counter jump defaultchain" >> "$tmp"
		else
			echo "add rule inet $table $chain counter return" >> "$tmp"
		fi
	done

	cnt=0

	# add a few anonymous sets. rhashtable is convered by named sets below.
	c=$((RANDOM%$count))
	chain=$(printf "chain%03u" "$((c+1))")
	echo "insert rule inet $table $chain tcp dport 22-26 ip saddr { 1.2.3.4, 5.6.7.8 } counter comment hash_fast" >> "$tmp"
	echo "insert rule inet $table $chain ip6 saddr { ::1, dead::beef } counter" comment hash >> "$tmp"
	echo "insert rule inet $table $chain ip saddr { 1.2.3.4 - 5.6.7.8, 127.0.0.1 } comment rbtree" >> "$tmp"
	# bitmap 1byte, with anon chain jump
	gen_anon_chain_jump "$table $chain ip protocol { 6, 17 }" >> "$tmp"

	# bitmap 2byte
	echo "insert rule inet $table $chain tcp dport != { 22, 23, 80 } goto defaultchain" >> "$tmp"
	echo "insert rule inet $table $chain tcp dport { 1-1024, 8000-8080 } jump defaultchain comment rbtree" >> "$tmp"
	if [ "$NFT_TEST_HAVE_pipapo" = y ] ;then
		# pipapo (concat + set), with goto anonymous chain.
		gen_anon_chain_jump "$table $chain ip saddr . tcp dport { 1.2.3.4 . 1-1024, 1.2.3.6 - 1.2.3.10 . 8000-8080, 1.2.3.4 . 8080, 1.2.3.6 - 1.2.3.10 . 22 }" >> "$tmp"
	fi

	# add a few anonymous sets. rhashtable is convered by named sets below.
	c=$((RANDOM%$count))
	chain=$(printf "chain%03u" "$((c+1))")
	echo "insert rule inet $table $chain tcp dport 22-26 ip saddr { 1.2.3.4, 5.6.7.8 } counter comment hash_fast" >> "$tmp"
	echo "insert rule inet $table $chain ip6 saddr { ::1, dead::beef } counter" comment hash >> "$tmp"
	echo "insert rule inet $table $chain ip saddr { 1.2.3.4 - 5.6.7.8, 127.0.0.1 } comment rbtree" >> "$tmp"
	# bitmap 1byte, with anon chain jump
	gen_anon_chain_jump "$table $chain ip protocol { 6, 17 }" >> "$tmp"
	# bitmap 2byte
	echo "insert rule inet $table $chain tcp dport != { 22, 23, 80 } goto defaultchain" >> "$tmp"
	echo "insert rule inet $table $chain tcp dport { 1-1024, 8000-8080 } jump defaultchain comment rbtree" >> "$tmp"
	if [ "$NFT_TEST_HAVE_pipapo" = y ] ;then
		# pipapo (concat + set), with goto anonymous chain.
		gen_anon_chain_jump "$table $chain ip saddr . tcp dport { 1.2.3.4 . 1-1024, 1.2.3.6 - 1.2.3.10 . 8000-8080, 1.2.3.4 . 8080, 1.2.3.6 - 1.2.3.10 . 22 }" >> "$tmp"
	fi

	# add constant/immutable sets
	size=$((RANDOM%5120000))
	size=$((size+2))
	echo "add set inet $table setc1 { typeof tcp dport; size $size; flags constant; elements = { 22, 44 } }" >> "$tmp"
	echo "add set inet $table setc2 { typeof ip saddr; size $size; flags constant; elements = { 1.2.3.4, 5.6.7.8 } }" >> "$tmp"
	echo "add set inet $table setc3 { typeof ip6 daddr; size $size; flags constant; elements = { ::1, dead::1 } }" >> "$tmp"
	echo "add set inet $table setc4 { typeof tcp dport; size $size; flags interval,constant; elements = { 22-44, 55-66 } }" >> "$tmp"
	echo "add set inet $table setc5 { typeof ip saddr; size $size; flags interval,constant; elements = { 1.2.3.4-5.6.7.8, 10.1.1.1 } }" >> "$tmp"
	echo "add set inet $table setc6 { typeof ip6 daddr; size $size; flags interval,constant; elements = { ::1, dead::1-dead::3 } }" >> "$tmp"

	# add named sets with various combinations (plain value, range, concatenated values, concatenated ranges, with timeouts, with data ...)
	for key in "ip saddr" "ip saddr . tcp dport"; do
		FLAGS=("")
		if [ "$key" == "ip saddr" ] ;then
			FLAGS+=("flags interval;")
		elif [ "$key" == "ip saddr . tcp dport" ] ;then
			if [ "$NFT_TEST_HAVE_pipapo" = y ] ;then
				FLAGS+=("flags interval;")
			fi
		fi
		for ((i = 0; i < ${#FLAGS[@]}; i++)) ; do
			timeout=$((RANDOM%10))
			timeout=$((timeout+1))
			timeout="timeout ${timeout}s"

			cnt=$((cnt+1))
			flags=${FLAGS[$i]}
			echo "add set inet $table set_${cnt}  { typeof ${key} ; ${flags} }" >> "$tmp"
			echo "add set inet $table sett${cnt} { typeof ${key} ; $timeout; ${flags} }" >> "$tmp"
			echo "add map inet $table dmap_${cnt} { typeof ${key} : meta mark ; ${flags} }" >> "$tmp"
			echo "add map inet $table dmapt${cnt} { typeof ${key} : meta mark ; $timeout ; ${flags} }" >> "$tmp"
			echo "add map inet $table vmap_${cnt} { typeof ${key} : verdict ; ${flags} }" >> "$tmp"
			echo "add map inet $table vmapt${cnt} { typeof ${key} : verdict; $timeout ; ${flags} }" >> "$tmp"
		done
	done

	cnt=0
	for key in "single" "concat"; do
		FLAGS=("")
		available_flags FLAGS $key

		for ((i = 0; i < ${#FLAGS[@]}; i++)) ; do
			flags=${FLAGS[$i]}
			want="${key}${flags}"
			cnt=$((cnt+1))
			maxip=$((RANDOM%256))

			if [ $maxip -eq 0 ];then
				maxip=1
			fi

			for e in $(seq 1 $maxip);do
				case "$want" in
				"single") element="10.1.1.$e"
					;;
				"concat")
					element="10.1.2.$e . $((RANDOM%65536))"
					;;
				"singleinterval")
					element="10.1.$e.0-10.1.$e.$e"
					;;
				"concatinterval")
					element="10.1.$e.0-10.1.$e.$e . $((RANDOM%65536))"
					;;
				*)
					echo "bogus key $want"
					exit 111
					;;
				esac

				echo "add element inet $table set_${cnt} { $element }" >> "$tmp"
				echo "add element inet $table sett${cnt} { $element timeout $((RANDOM%60))s }" >> "$tmp"
				echo "add element inet $table dmap_${cnt} { $element : $RANDOM }" >> "$tmp"
				echo "add element inet $table dmapt${cnt} { $element timeout $((RANDOM%60))s : $RANDOM }" >> "$tmp"
				echo "add element inet $table vmap_${cnt} { $element : `random_verdict $count` }" >> "$tmp"
				echo "add element inet $table vmapt${cnt} { $element timeout $((RANDOM%60))s : `random_verdict $count` }" >> "$tmp"
			done
		done
	done
done
}

run_test()
{
	local time_now=$(date +%s)
	local time_stop=$((time_now + $runtime))
	local regen=30

	while [ $time_now -lt $time_stop ]; do
		if [ $regen -gt 0 ];then
			sleep 1
			time_now=$(date +%s)
			regen=$((regen-1))
			continue
		fi

		# This clobbers the previously generated ruleset, this is intentional.
		gen_ruleset
		regen=$((RANDOM%60))
		regen=$((regen+2))
		time_now=$(date +%s)
	done
}

netns_add

gen_ruleset
ip netns exec "$testns" $NFT -f "$tmp" || exit 1

failslab_defaults

stress_all 2>/dev/null &

randsleep

floodping 2> /dev/null &

run_test

# this stops stress_all
rm -f "$tmp"
tmp=""
sleep 4

if [ "$NFT_TEST_HAVE_chain_binding" = n ] ; then
	echo "Ran a modified version of the test due to NFT_TEST_HAVE_chain_binding=n"
fi