. /lib/functions/network.sh

[ -n "$ZAPRET_BASE" ] || ZAPRET_BASE=/opt/zapret
. "$ZAPRET_BASE/config"
. "$ZAPRET_BASE/common/base.sh"
. "$ZAPRET_BASE/common/fwtype.sh"
. "$ZAPRET_BASE/common/queue.sh"
. "$ZAPRET_BASE/common/linux_iphelper.sh"
. "$ZAPRET_BASE/common/ipt.sh"
. "$ZAPRET_BASE/common/nft.sh"
. "$ZAPRET_BASE/common/linux_fw.sh"

[ -n "$QNUM" ] || QNUM=200
[ -n "$TPPORT" ] || TPPORT=988
[ -n "$WS_USER" ] || WS_USER=daemon
[ -n "$DESYNC_MARK" ] || DESYNC_MARK=0x40000000
[ -n "$OPENWRT_LAN" ] || OPENWRT_LAN=lan

TPWS_LOCALHOST4=127.0.0.127

# max wait time for the link local ipv6 on the LAN interface
LINKLOCAL_WAIT_SEC=5

IPSET_CR="$ZAPRET_BASE/ipset/create_ipset.sh"

CUSTOM_SCRIPT="$ZAPRET_BASE/init.d/openwrt/custom"
[ -f "$CUSTOM_SCRIPT" ] && . "$CUSTOM_SCRIPT"

IPSET_EXCLUDE="-m set ! --match-set nozapret"
IPSET_EXCLUDE6="-m set ! --match-set nozapret6"

NFQWS_OPT_DESYNC_HTTP="${NFQWS_OPT_DESYNC_HTTP:-$NFQWS_OPT_DESYNC}"
NFQWS_OPT_DESYNC_HTTPS="${NFQWS_OPT_DESYNC_HTTPS:-$NFQWS_OPT_DESYNC}"
NFQWS_OPT_DESYNC_HTTP6="${NFQWS_OPT_DESYNC_HTTP6:-$NFQWS_OPT_DESYNC_HTTP}"
NFQWS_OPT_DESYNC_HTTPS6="${NFQWS_OPT_DESYNC_HTTPS6:-$NFQWS_OPT_DESYNC_HTTPS}"



# can be multiple ipv6 outgoing interfaces
# uplink from isp, tunnelbroker, vpn, ...
# want them all. who knows what's the real one that blocks sites
# dont want any manual configuration - want to do it automatically
# standard network_find_wan[6] return only the first
# we use low level function from network.sh to avoid this limitation
# it can change theoretically and stop working

network_find_wan4_all()
{
	__network_ifstatus "$1" "" "[@.route[@.target='0.0.0.0' && !@.table]].interface" "" 10 2>/dev/null && return
	network_find_wan $1
}
network_find_wan_all()
{
	network_find_wan4_all "$@"
}
network_find_wan6_all()
{
	__network_ifstatus "$1" "" "[@.route[@.target='::' && !@.table]].interface" "" 10 2>/dev/null && return
	network_find_wan6 $1
}

dnat6_target()
{
	# $1 - lan network name
	# $2 - var to store target ip6

	network_is_up $1 || {
		[ -n "$2" ] && eval $2=''
		return
	}

	local DEVICE
	network_get_device DEVICE $1

	_dnat6_target $DEVICE $2
}

set_route_localnet()
{
	# $1 - 1 = enable, 0 = disable

	local DLAN
	call_for_multiple_items network_get_device DLAN "$OPENWRT_LAN"
	_set_route_localnet $1 $DLAN
}


fw_nfqws_post_x()
{
	# $1 - 1 - add, 0 - del
	# $2 - filter
	# $3 - queue number
	# $4 - ip version : 4 or 6

	network_find_wan${4}_all ifaces
	call_for_multiple_items network_get_device DWAN "$ifaces"

	[ -n "$DWAN" ] && _fw_nfqws_post${4} $1 "$2" $3 "$(unique $DWAN)"
}
fw_nfqws_post4()
{
	fw_nfqws_post_x  $1 "$2" $3 4
}
fw_nfqws_post6()
{
	fw_nfqws_post_x  $1 "$2" $3 6
}
fw_tpws_x()
{
	# $1 - 1 - add, 0 - del
	# $2 - filter
	# $3 - tpws port
	# $4 - ip version : 4 or 6

	local ifaces DLAN DWAN

	call_for_multiple_items network_get_device DLAN "$OPENWRT_LAN"

	network_find_wan${4}_all ifaces
	call_for_multiple_items network_get_device DWAN "$ifaces"

	[ -n "$DWAN" ] && _fw_tpws${4} $1 "$2" $3 "$DLAN" "$(unique $DWAN)"
}
fw_tpws4()
{
	fw_tpws_x $1 "$2" $3 4
}
fw_tpws6()
{
	fw_tpws_x $1 "$2" $3 6
}


create_ipset()
{
	echo "Creating ip list table (firewall type $FWTYPE)"
	"$IPSET_CR" "$@"
}

list_nfqws_rules()
{
	# $1 = '' for ipv4, '6' for ipv6
	ip$1tables -S POSTROUTING -t mangle | \
		grep -E "NFQUEUE --queue-num $QNUM --queue-bypass|NFQUEUE --queue-num $(($QNUM+1)) --queue-bypass|NFQUEUE --queue-num $(($QNUM+2)) --queue-bypass|NFQUEUE --queue-num $(($QNUM+3)) --queue-bypass" | \
		sed -re 's/^-A POSTROUTING (.*) -j NFQUEUE.*$/\1/' -e "s/-m mark ! --mark $DESYNC_MARK\/$DESYNC_MARK//"
}
reverse_nfqws_rule()
{
	sed -e 's/-o /-i /g' -e 's/--dport /--sport /g' -e 's/--dports /--sports /g' -e 's/ dst$/ src/' -e 's/ dst / src /g'
}
apply_flow_offloading_enable_rule()
{
	# $1 = '' for ipv4, '6' for ipv6
	local i off='-j FLOWOFFLOAD'
	[ "$FLOWOFFLOAD" = "hardware" ] && off="$off --hw"
	i="forwarding_rule_zapret -m comment --comment zapret_traffic_offloading_enable -m conntrack --ctstate RELATED,ESTABLISHED $off"
	echo enabling ipv${1:-4} flow offloading : $i
	ip$1tables -A $i
}
apply_flow_offloading_exempt_rule()
{
	# $1 = '' for ipv4, '6' for ipv6
	local i v
	v=$1
	shift
	i="forwarding_rule_zapret $@ -m comment --comment zapret_traffic_offloading_exemption -j RETURN"
	echo applying ipv${v:-4} flow offloading exemption : $i
	ip${v}tables -A $i
}
flow_offloading_unexempt_v()
{
	ipt$1_del FORWARD -j forwarding_rule_zapret
	ip$1tables -F forwarding_rule_zapret 2>/dev/null
	ip$1tables -X forwarding_rule_zapret 2>/dev/null
}
flow_offloading_exempt_v()
{
	# $1 = '' for ipv4, '6' for ipv6

	is_ipt_flow_offload_avail $1 || return 0

	flow_offloading_unexempt_v $1

	[ "$FLOWOFFLOAD" = 'software' -o "$FLOWOFFLOAD" = 'hardware' ] && {
		ip$1tables -N forwarding_rule_zapret

		list_nfqws_rules $1 |
		while read rule; do
			apply_flow_offloading_exempt_rule "$1" $rule
		done

		list_nfqws_rules $1 | grep -v "connbytes" | reverse_nfqws_rule |
		while read rule; do
			apply_flow_offloading_exempt_rule "$1" $rule
		done
	
		apply_flow_offloading_enable_rule $1

		ipt$1 FORWARD -j forwarding_rule_zapret
	}

	return 0
}
flow_offloading_exempt()
{
	[ "$DISABLE_IPV4" = "1" ] || flow_offloading_exempt_v
	[ "$DISABLE_IPV6" = "1" ] || flow_offloading_exempt_v 6
}
flow_offloading_unexempt()
{
	[ "$DISABLE_IPV4" = "1" ] || flow_offloading_unexempt_v
	[ "$DISABLE_IPV6" = "1" ] || flow_offloading_unexempt_v 6
}



nft_fill_ifsets_overload()
{
	local ifaces DLAN DWAN DWAN6

	call_for_multiple_items network_get_device DLAN "$OPENWRT_LAN"

	network_find_wan4_all ifaces
	call_for_multiple_items network_get_device DWAN "$ifaces"

	network_find_wan6_all ifaces
	call_for_multiple_items network_get_device DWAN6 "$ifaces"

	nft_fill_ifsets "$DLAN" "$DWAN" "$DWAN6"
}

nft_fw_tpws4()
{
	_nft_fw_tpws4 "$1" $2 always_apply_wan_filter
}
nft_fw_tpws6()
{
	local DLAN
	call_for_multiple_items network_get_device DLAN "$OPENWRT_LAN"
	_nft_fw_tpws6 "$1" $2 "$DLAN" always_apply_wan_filter
}
nft_fw_nfqws_post4()
{
	_nft_fw_nfqws_post4 "$1" $2 always_apply_wan_filter
}
nft_fw_nfqws_post6()
{
	_nft_fw_nfqws_post6 "$1" $2 always_apply_wan_filter
}
