. /lib/functions/network.sh

ZAPRET_BASE=${ZAPRET_BASE:-/opt/zapret}
ZAPRET_RW=${ZAPRET_RW:-"$ZAPRET_BASE"}
ZAPRET_CONFIG=${ZAPRET_CONFIG:-"$ZAPRET_RW/config"}
. "$ZAPRET_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"
. "$ZAPRET_BASE/common/linux_fw.sh"
. "$ZAPRET_BASE/common/list.sh"

[ -n "$QNUM" ] || QNUM=200
[ -n "$TPPORT" ] || TPPORT=988
[ -n "$WS_USER" ] || WS_USER=daemon
[ -n "$DESYNC_MARK" ] || DESYNC_MARK=0x40000000
[ -n "$DESYNC_MARK_POSTNAT" ] || DESYNC_MARK_POSTNAT=0x20000000
[ -n "$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"

apply_unspecified_desync_modes


# 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()
{
	if [ -n "$OPENWRT_WAN4" ]; then
		eval $1="\$OPENWRT_WAN4"
	else
		__network_ifstatus "$1" "" "[@.route[@.target='0.0.0.0' && !@.table]].interface" "" 10 2>/dev/null && return
		network_find_wan $1
	fi
}
network_find_wan_all()
{
	network_find_wan4_all "$@"
}
network_find_wan6_all()
{
	if [ -n "$OPENWRT_WAN6" ]; then
		eval $1="\$OPENWRT_WAN6"
	else
		__network_ifstatus "$1" "" "[@.route[@.target='::' && !@.table]].interface" "" 10 2>/dev/null && return
		network_find_wan6 $1
	fi
}
network_find_wanX_devices()
{
	# $1 - ip version: 4 or 6
	# $2 - variable to put result to
	local ifaces
	network_find_wan${1}_all ifaces
	call_for_multiple_items network_get_device $2 "$ifaces"
}


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_prepost_x()
{
	# $1 - 1 - add, 0 - del
	# $2 - filter
	# $3 - queue number
	# $4 - 4/6
	# $5 - post/pre

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

	[ -n "$DWAN" ] && _fw_nfqws_${5}${4} $1 "$2" $3 "$(unique $DWAN)"
}
fw_nfqws_post4()
{
	fw_nfqws_prepost_x  $1 "$2" $3 4 post
}
fw_nfqws_post6()
{
	fw_nfqws_prepost_x  $1 "$2" $3 6 post
}
fw_nfqws_pre4()
{
	fw_nfqws_prepost_x  $1 "$2" $3 4 pre
}
fw_nfqws_pre6()
{
	fw_nfqws_prepost_x  $1 "$2" $3 6 pre
}
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|NFQUEUE --queue-num $(($QNUM+10)) --queue-bypass|NFQUEUE --queue-num $(($QNUM+11)) --queue-bypass" | \
		sed -re 's/^-A POSTROUTING (.*) -j NFQUEUE.*$/\1/' -e "s/-m mark ! --mark $DESYNC_MARK\/$DESYNC_MARK//"
}
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()
{
	# $1 = '' for ipv4, '6' for ipv6
	local DWAN
	network_find_wanX_devices ${1:-4} DWAN
	for i in $DWAN; do ipt$1_del FORWARD -o $i -j forwarding_rule_zapret ; done
	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

		# remove outgoing interface
		list_nfqws_rules $1 | sed -re 's/-o +[^ ]+//g' |
		while read rule; do
			apply_flow_offloading_exempt_rule "$1" $rule
		done
	
		apply_flow_offloading_enable_rule $1

		# only outgoing to WAN packets trigger flow offloading
		local DWAN
		network_find_wanX_devices ${1:-4} DWAN
		for i in $DWAN; do ipt$1 FORWARD -o $i -j forwarding_rule_zapret; done
	}
	return 0
}
flow_offloading_exempt()
{
	[ "$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 PDLAN PDWAN PDWAN6

	call_for_multiple_items network_get_device DLAN "$OPENWRT_LAN"
	call_for_multiple_items network_get_physdev PDLAN "$OPENWRT_LAN"

	network_find_wan4_all ifaces
	call_for_multiple_items network_get_device DWAN "$ifaces"
	call_for_multiple_items network_get_physdev PDWAN "$ifaces"

	network_find_wan6_all ifaces
	call_for_multiple_items network_get_device DWAN6 "$ifaces"
	call_for_multiple_items network_get_physdev PDWAN6 "$ifaces"

	nft_fill_ifsets "$DLAN" "$DWAN" "$DWAN6" "$PDLAN" "$PDWAN" "$PDWAN6"
}

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
}
nft_fw_nfqws_pre4()
{
	_nft_fw_nfqws_pre4 "$1" $2 always_apply_wan_filter
}
nft_fw_nfqws_pre6()
{
	_nft_fw_nfqws_pre6 "$1" $2 always_apply_wan_filter
}