Add netifd with patch to fix service restart

13 files changed, 771 insertions, 0 deletions

diff --git a/netifd/Makefile b/netifd/Makefile
new file mode 100644
index 0000000..0edd277
--- /dev/null
+++ b/netifd/Makefile
@@ -0,0 +1,46 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=netifd
+PKG_RELEASE:=2
+
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL=$(PROJECT_GIT)/project/netifd.git
+PKG_SOURCE_DATE:=2019-08-05
+PKG_SOURCE_VERSION:=5e02f94411b06f192fb2a7d9be9abde3549153a8
+PKG_MIRROR_HASH:=96e158584c605e96aceb3ce7e8ad8faa8e774ffd67d59558b2d6c2ff49d0f1a5
+PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
+
+PKG_LICENSE:=GPL-2.0
+PKG_LICENSE_FILES:=
+
+PKG_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+define Package/netifd
+  SECTION:=base
+  CATEGORY:=Base system
+  DEPENDS:=+libuci +libnl-tiny +libubus +ubus +ubusd +jshn +libubox
+  TITLE:=OpenWrt Network Interface Configuration Daemon
+endef
+
+TARGET_CFLAGS += \
+	-I$(STAGING_DIR)/usr/include/libnl-tiny \
+	-I$(STAGING_DIR)/usr/include \
+	-flto
+
+TARGET_LDFLAGS += -flto -fuse-linker-plugin
+
+CMAKE_OPTIONS += \
+	-DLIBNL_LIBS=-lnl-tiny \
+	-DDEBUG=1
+
+define Package/netifd/install
+	$(INSTALL_DIR) $(1)/sbin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/netifd $(1)/sbin/
+	$(CP) ./files/* $(1)/
+	$(CP) $(PKG_BUILD_DIR)/scripts/* $(1)/lib/netifd/
+endef
+
+$(eval $(call BuildPackage,netifd))
diff --git a/netifd/files/etc/hotplug.d/iface/00-netstate b/netifd/files/etc/hotplug.d/iface/00-netstate
new file mode 100644
index 0000000..71ccb01
--- /dev/null
+++ b/netifd/files/etc/hotplug.d/iface/00-netstate
@@ -0,0 +1,6 @@
+[ ifup = "$ACTION" ] && {
+	uci_toggle_state network "$INTERFACE" up 1
+	[ -n "$DEVICE" ] && {
+		uci_toggle_state network "$INTERFACE" ifname "$DEVICE"
+	}
+}
diff --git a/netifd/files/etc/hotplug.d/net/20-smp-tune b/netifd/files/etc/hotplug.d/net/20-smp-tune
new file mode 100644
index 0000000..ab9a904
--- /dev/null
+++ b/netifd/files/etc/hotplug.d/net/20-smp-tune
@@ -0,0 +1,67 @@
+#!/bin/sh
+[ "$ACTION" = add ] || exit
+
+NPROCS="$(grep -c "^processor.*:" /proc/cpuinfo)"
+[ "$NPROCS" -gt 1 ] || exit
+
+PROC_MASK="$(( (1 << $NPROCS) - 1 ))"
+
+find_irq_cpu() {
+	local dev="$1"
+	local match="$(grep -m 1 "$dev\$" /proc/interrupts)"
+	local cpu=0
+
+	[ -n "$match" ] && {
+		set -- $match
+		shift
+		for cur in `seq 1 $NPROCS`; do
+			[ "$1" -gt 0 ] && {
+				cpu=$(($cur - 1))
+				break
+			}
+			shift
+		done
+	}
+
+	echo "$cpu"
+}
+
+set_hex_val() {
+	local file="$1"
+	local val="$2"
+	val="$(printf %x "$val")"
+	[ -n "$DEBUG" ] && echo "$file = $val"
+	echo "$val" > "$file"
+}
+
+default_ps="$(uci get "network.@globals[0].default_ps")"
+[ -n "$default_ps" -a "$default_ps" != 1 ] && exit 0
+
+exec 512>/var/lock/smp_tune.lock
+flock 512 || exit 1
+
+for dev in /sys/class/net/*; do
+	[ -d "$dev" ] || continue
+
+	# ignore virtual interfaces
+	[ -n "$(ls "${dev}/" | grep '^lower_')" ] && continue
+	[ -d "${dev}/device" ] || continue
+
+	device="$(readlink "${dev}/device")"
+	device="$(basename "$device")"
+	irq_cpu="$(find_irq_cpu "$device")"
+	irq_cpu_mask="$((1 << $irq_cpu))"
+
+	for q in ${dev}/queues/rx-*; do
+		set_hex_val "$q/rps_cpus" "$(($PROC_MASK & ~$irq_cpu_mask))"
+	done
+
+	ntxq="$(ls -d ${dev}/queues/tx-* | wc -l)"
+
+	idx=$(($irq_cpu + 1))
+	for q in ${dev}/queues/tx-*; do
+		set_hex_val "$q/xps_cpus" "$((1 << $idx))"
+		let "idx = idx + 1"
+		[ "$idx" -ge "$NPROCS" ] && idx=0
+	done
+done
diff --git a/netifd/files/etc/init.d/network b/netifd/files/etc/init.d/network
new file mode 100755
index 0000000..2321a30
--- /dev/null
+++ b/netifd/files/etc/init.d/network
@@ -0,0 +1,149 @@
+#!/bin/sh /etc/rc.common
+
+START=20
+STOP=90
+
+USE_PROCD=1
+
+init_switch() {
+	setup_switch() { return 0; }
+
+	include /lib/network
+	setup_switch
+}
+
+start_service() {
+	init_switch
+
+	procd_open_instance
+	procd_set_param command /sbin/netifd
+	procd_set_param respawn
+	procd_set_param watch network.interface
+	[ -e /proc/sys/kernel/core_pattern ] && {
+		procd_set_param limits core="unlimited"
+	}
+	procd_close_instance
+}
+
+reload_service() {
+	local rv=0
+
+	init_switch
+	ubus call network reload || rv=1
+	/sbin/wifi reload_legacy
+	return $rv
+}
+
+stop_service() {
+	/sbin/wifi down
+	ifdown -a
+	sleep 1
+}
+
+service_running() {
+	ubus -t 30 wait_for network.interface
+	/sbin/wifi reload_legacy
+}
+
+validate_atm_bridge_section()
+{
+	uci_validate_section network "atm-bridge" "${1}" \
+		'unit:uinteger:0' \
+		'vci:range(32, 65535):35' \
+		'vpi:range(0, 255):8' \
+		'atmdev:uinteger:0' \
+		'encaps:or("llc", "vc"):llc' \
+		'payload:or("bridged", "routed"):bridged'
+}
+
+validate_route_section()
+{
+	uci_validate_section network route "${1}" \
+		'interface:string' \
+		'target:cidr4' \
+		'netmask:netmask4' \
+		'gateway:ip4addr' \
+		'metric:uinteger' \
+		'mtu:uinteger' \
+		'table:or(range(0,65535),string)'
+}
+
+validate_route6_section()
+{
+	uci_validate_section network route6 "${1}" \
+		'interface:string' \
+		'target:cidr6' \
+		'gateway:ip6addr' \
+		'metric:uinteger' \
+		'mtu:uinteger' \
+		'table:or(range(0,65535),string)'
+}
+
+validate_rule_section()
+{
+	uci_validate_section network rule "${1}" \
+		'in:string' \
+		'out:string' \
+		'src:cidr4' \
+		'dest:cidr4' \
+		'tos:range(0,31)' \
+		'mark:string' \
+		'invert:bool' \
+		'lookup:or(range(0,65535),string)' \
+		'goto:range(0,65535)' \
+		'action:or("prohibit", "unreachable", "blackhole", "throw")'
+}
+
+validate_rule6_section()
+{
+	uci_validate_section network rule6 "${1}" \
+		'in:string' \
+		'out:string' \
+		'src:cidr6' \
+		'dest:cidr6' \
+		'tos:range(0,31)' \
+		'mark:string' \
+		'invert:bool' \
+		'lookup:or(range(0,65535),string)' \
+		'goto:range(0,65535)' \
+		'action:or("prohibit", "unreachable", "blackhole", "throw")'
+}
+
+validate_switch_section()
+{
+	uci_validate_section network switch "${1}" \
+		'name:string' \
+		'enable:bool' \
+		'enable_vlan:bool' \
+		'reset:bool' \
+		'ar8xxx_mib_poll_interval:uinteger' \
+		'ar8xxx_mib_type:range(0,1)'
+}
+
+validate_switch_vlan()
+{
+	uci_validate_section network switch_vlan "${1}" \
+		'device:string' \
+		'vlan:uinteger' \
+		'ports:list(ports)'
+}
+
+service_triggers()
+{
+	procd_add_reload_trigger network wireless
+
+	procd_open_validate
+	validate_atm_bridge_section
+	validate_route_section
+	[ -e /proc/sys/net/ipv6 ] && validate_route6_section
+	validate_rule_section
+	[ -e /proc/sys/net/ipv6 ] && validate_rule6_section
+	validate_switch_section
+	validate_switch_vlan
+	procd_close_validate
+}
+
+shutdown() {
+	ifdown -a
+	sleep 1
+}
diff --git a/netifd/files/lib/netifd/dhcp.script b/netifd/files/lib/netifd/dhcp.script
new file mode 100755
index 0000000..00604f4
--- /dev/null
+++ b/netifd/files/lib/netifd/dhcp.script
@@ -0,0 +1,110 @@
+#!/bin/sh
+[ -z "$1" ] && echo "Error: should be run by udhcpc" && exit 1
+
+. /lib/functions.sh
+. /lib/netifd/netifd-proto.sh
+
+set_classless_routes() {
+	local max=128
+	while [ -n "$1" -a -n "$2" -a $max -gt 0 ]; do
+		proto_add_ipv4_route "${1%%/*}" "${1##*/}" "$2" "$ip"
+		max=$(($max-1))
+		shift 2
+	done
+}
+
+setup_interface () {
+	proto_init_update "*" 1
+	proto_add_ipv4_address "$ip" "${subnet:-255.255.255.0}"
+	# TODO: apply $broadcast
+
+	local ip_net
+	eval "$(ipcalc.sh "$ip/$mask")";ip_net="$NETWORK"
+
+	local i
+	for i in $router; do
+		local gw_net
+		eval "$(ipcalc.sh "$i/$mask")";gw_net="$NETWORK"
+
+		[ "$ip_net" != "$gw_net" ] && proto_add_ipv4_route "$i" 32 "" "$ip"
+		proto_add_ipv4_route 0.0.0.0 0 "$i" "$ip"
+
+		local r
+		for r in $CUSTOMROUTES; do
+			proto_add_ipv4_route "${r%%/*}" "${r##*/}" "$i" "$ip"
+		done
+	done
+
+	# CIDR STATIC ROUTES (rfc3442)
+	[ -n "$staticroutes" ] && set_classless_routes $staticroutes
+	[ -n "$msstaticroutes" ] && set_classless_routes $msstaticroutes
+
+	for i in $dns; do
+		proto_add_dns_server "$i"
+	done
+	for i in $domain; do
+		proto_add_dns_search "$i"
+	done
+
+	proto_add_data
+	[ -n "$ZONE" ]     && json_add_string zone "$ZONE"
+	[ -n "$ntpsrv" ]   && json_add_string ntpserver "$ntpsrv"
+	[ -n "$timesvr" ]  && json_add_string timeserver "$timesvr"
+	[ -n "$hostname" ] && json_add_string hostname "$hostname"
+	[ -n "$message" ]  && json_add_string message "$message"
+	[ -n "$timezone" ] && json_add_int timezone "$timezone"
+	[ -n "$lease" ]    && json_add_int leasetime "$lease"
+	proto_close_data
+
+	proto_send_update "$INTERFACE"
+
+
+	if [ "$IFACE6RD" != 0 -a -n "$ip6rd" ]; then
+		local v4mask="${ip6rd%% *}"
+		ip6rd="${ip6rd#* }"
+		local ip6rdprefixlen="${ip6rd%% *}"
+		ip6rd="${ip6rd#* }"
+		local ip6rdprefix="${ip6rd%% *}"
+		ip6rd="${ip6rd#* }"
+		local ip6rdbr="${ip6rd%% *}"
+
+		[ -n "$ZONE" ] || ZONE=$(fw3 -q network $INTERFACE 2>/dev/null)
+		[ -z "$IFACE6RD" -o "$IFACE6RD" = 1 ] && IFACE6RD=${INTERFACE}_6
+
+		json_init
+		json_add_string name "$IFACE6RD"
+		json_add_string ifname "@$INTERFACE"
+		json_add_string proto "6rd"
+		json_add_string peeraddr "$ip6rdbr"
+		json_add_int ip4prefixlen "$v4mask"
+		json_add_string ip6prefix "$ip6rdprefix"
+		json_add_int ip6prefixlen "$ip6rdprefixlen"
+		json_add_string tunlink "$INTERFACE"
+		[ -n "$IFACE6RD_DELEGATE" ] && json_add_boolean delegate "$IFACE6RD_DELEGATE"
+		[ -n "$ZONE6RD" ] || ZONE6RD=$ZONE
+		[ -n "$ZONE6RD" ] && json_add_string zone "$ZONE6RD"
+		[ -n "$MTU6RD" ] && json_add_string mtu "$MTU6RD"
+		json_close_object
+
+		ubus call network add_dynamic "$(json_dump)"
+	fi
+}
+
+deconfig_interface() {
+	proto_init_update "*" 0
+	proto_send_update "$INTERFACE"
+}
+
+case "$1" in
+	deconfig)
+		deconfig_interface
+	;;
+	renew|bound)
+		setup_interface
+	;;
+esac
+
+# user rules
+[ -f /etc/udhcpc.user ] && . /etc/udhcpc.user "$@"
+
+exit 0
diff --git a/netifd/files/lib/netifd/proto/dhcp.sh b/netifd/files/lib/netifd/proto/dhcp.sh
new file mode 100755
index 0000000..0d06eba
--- /dev/null
+++ b/netifd/files/lib/netifd/proto/dhcp.sh
@@ -0,0 +1,88 @@
+#!/bin/sh
+
+[ -L /sbin/udhcpc ] || exit 0
+
+. /lib/functions.sh
+. ../netifd-proto.sh
+init_proto "$@"
+
+proto_dhcp_init_config() {
+	renew_handler=1
+
+	proto_config_add_string 'ipaddr:ipaddr'
+	proto_config_add_string 'hostname:hostname'
+	proto_config_add_string clientid
+	proto_config_add_string vendorid
+	proto_config_add_boolean 'broadcast:bool'
+	proto_config_add_boolean 'release:bool'
+	proto_config_add_string 'reqopts:list(string)'
+	proto_config_add_boolean 'defaultreqopts:bool'
+	proto_config_add_string iface6rd
+	proto_config_add_array 'sendopts:list(string)'
+	proto_config_add_boolean delegate
+	proto_config_add_string zone6rd
+	proto_config_add_string zone
+	proto_config_add_string mtu6rd
+	proto_config_add_string customroutes
+	proto_config_add_boolean classlessroute
+}
+
+proto_dhcp_add_sendopts() {
+	[ -n "$1" ] && append "$3" "-x $1"
+}
+
+proto_dhcp_setup() {
+	local config="$1"
+	local iface="$2"
+
+	local ipaddr hostname clientid vendorid broadcast release reqopts defaultreqopts iface6rd sendopts delegate zone6rd zone mtu6rd customroutes classlessroute
+	json_get_vars ipaddr hostname clientid vendorid broadcast release reqopts defaultreqopts iface6rd delegate zone6rd zone mtu6rd customroutes classlessroute
+
+	local opt dhcpopts
+	for opt in $reqopts; do
+		append dhcpopts "-O $opt"
+	done
+
+	json_for_each_item proto_dhcp_add_sendopts sendopts dhcpopts
+
+	[ -z "$hostname" ] && hostname="$(cat /proc/sys/kernel/hostname)"
+	[ "$hostname" = "*" ] && hostname=
+
+	[ "$defaultreqopts" = 0 ] && defaultreqopts="-o" || defaultreqopts=
+	[ "$broadcast" = 1 ] && broadcast="-B" || broadcast=
+	[ "$release" = 1 ] && release="-R" || release=
+	[ -n "$clientid" ] && clientid="-x 0x3d:${clientid//:/}" || clientid="-C"
+	[ -n "$iface6rd" ] && proto_export "IFACE6RD=$iface6rd"
+	[ "$iface6rd" != 0 -a -f /lib/netifd/proto/6rd.sh ] && append dhcpopts "-O 212"
+	[ -n "$zone6rd" ] && proto_export "ZONE6RD=$zone6rd"
+	[ -n "$zone" ] && proto_export "ZONE=$zone"
+	[ -n "$mtu6rd" ] && proto_export "MTU6RD=$mtu6rd"
+	[ -n "$customroutes" ] && proto_export "CUSTOMROUTES=$customroutes"
+	[ "$delegate" = "0" ] && proto_export "IFACE6RD_DELEGATE=0"
+	# Request classless route option (see RFC 3442) by default
+	[ "$classlessroute" = "0" ] || append dhcpopts "-O 121"
+
+	proto_export "INTERFACE=$config"
+	proto_run_command "$config" udhcpc \
+		-p /var/run/udhcpc-$iface.pid \
+		-s /lib/netifd/dhcp.script \
+		-f -t 0 -i "$iface" \
+		${ipaddr:+-r $ipaddr} \
+		${hostname:+-x "hostname:$hostname"} \
+		${vendorid:+-V "$vendorid"} \
+		$clientid $defaultreqopts $broadcast $release $dhcpopts
+}
+
+proto_dhcp_renew() {
+	local interface="$1"
+	# SIGUSR1 forces udhcpc to renew its lease
+	local sigusr1="$(kill -l SIGUSR1)"
+	[ -n "$sigusr1" ] && proto_kill_command "$interface" $sigusr1
+}
+
+proto_dhcp_teardown() {
+	local interface="$1"
+	proto_kill_command "$interface"
+}
+
+add_protocol dhcp
diff --git a/netifd/files/lib/network/config.sh b/netifd/files/lib/network/config.sh
new file mode 100755
index 0000000..0ded45e
--- /dev/null
+++ b/netifd/files/lib/network/config.sh
@@ -0,0 +1,76 @@
+#!/bin/sh
+# Copyright (C) 2011 OpenWrt.org
+
+. /usr/share/libubox/jshn.sh
+
+find_config() {
+	local device="$1"
+	local ifdev ifl3dev ifobj
+	for ifobj in `ubus list network.interface.\*`; do
+		interface="${ifobj##network.interface.}"
+		(
+			json_load "$(ifstatus $interface)"
+			json_get_var ifdev device
+			json_get_var ifl3dev l3_device
+			if [[ "$device" = "$ifdev" ]] || [[ "$device" = "$ifl3dev" ]]; then
+				echo "$interface"
+				exit 0
+			else
+				exit 1
+			fi
+		) && return
+	done
+}
+
+unbridge() {
+	return
+}
+
+ubus_call() {
+	json_init
+	local _data="$(ubus -S call "$1" "$2")"
+	[ -z "$_data" ] && return 1
+	json_load "$_data"
+	return 0
+}
+
+
+fixup_interface() {
+	local config="$1"
+	local ifname type device l3dev
+
+	config_get type "$config" type
+	config_get ifname "$config" ifname
+	[ "bridge" = "$type" ] && ifname="br-$config"
+	ubus_call "network.interface.$config" status || return 0
+	json_get_var l3dev l3_device
+	[ -n "$l3dev" ] && ifname="$l3dev"
+	json_init
+	config_set "$config" ifname "$ifname"
+}
+
+scan_interfaces() {
+	config_load network
+	config_foreach fixup_interface interface
+}
+
+prepare_interface_bridge() {
+	local config="$1"
+
+	[ -n "$config" ] || return 0
+	ubus call network.interface."$config" prepare
+}
+
+setup_interface() {
+	local iface="$1"
+	local config="$2"
+
+	[ -n "$config" ] || return 0
+	ubus call network.interface."$config" add_device "{ \"name\": \"$iface\" }"
+}
+
+do_sysctl() {
+	[ -n "$2" ] && \
+		sysctl -n -e -w "$1=$2" >/dev/null || \
+		sysctl -n -e "$1"
+}
diff --git a/netifd/files/sbin/devstatus b/netifd/files/sbin/devstatus
new file mode 100755
index 0000000..3c35b26
--- /dev/null
+++ b/netifd/files/sbin/devstatus
@@ -0,0 +1,12 @@
+#!/bin/sh
+. /usr/share/libubox/jshn.sh
+DEVICE="$1"
+
+[ -n "$DEVICE" ] || {
+	echo "Usage: $0 <device>"
+	exit 1
+}
+
+json_init
+json_add_string name "$DEVICE"
+ubus call network.device status "$(json_dump)"
diff --git a/netifd/files/sbin/ifdown b/netifd/files/sbin/ifdown
new file mode 120000
index 0000000..a0e5c17
--- /dev/null
+++ b/netifd/files/sbin/ifdown
@@ -0,0 +1 @@
+ifup
\ No newline at end of file
diff --git a/netifd/files/sbin/ifstatus b/netifd/files/sbin/ifstatus
new file mode 100755
index 0000000..8a951e6
--- /dev/null
+++ b/netifd/files/sbin/ifstatus
@@ -0,0 +1,13 @@
+#!/bin/sh
+INTERFACE="$1"
+
+[ -n "$INTERFACE" ] || {
+	echo "Usage: $0 <interface>"
+	exit 1
+}
+
+ubus -S list "network.interface.$INTERFACE" >/dev/null || {
+	echo "Interface $INTERFACE not found"
+	exit 1
+}
+ubus call network.interface status "{ \"interface\" : \"$INTERFACE\" }"
diff --git a/netifd/files/sbin/ifup b/netifd/files/sbin/ifup
new file mode 100755
index 0000000..5515b91
--- /dev/null
+++ b/netifd/files/sbin/ifup
@@ -0,0 +1,77 @@
+#!/bin/sh
+
+ifup_all=
+setup_wifi=
+
+if_call() {
+	local interface="$1"
+	for mode in $modes; do
+		ubus call network.interface $mode "{ \"interface\" : \"$interface\" }"
+	done
+}
+
+case "$0" in
+	*ifdown) modes=down;;
+	*ifup)
+		modes="down up"
+		setup_wifi=1
+	;;
+	*) echo "Invalid command: $0";;
+esac
+
+while :; do
+	case "$1" in
+		-a)
+			ifup_all=1
+			shift
+		;;
+		-w)
+			setup_wifi=
+			shift
+		;;
+		*)
+			break
+		;;
+	esac
+done
+
+[ "$modes" = "down up" ] && ubus call network reload
+if [ -n "$ifup_all" ]; then
+	for interface in `ubus -S list 'network.interface.*'`; do
+		if_call "${interface##network.interface.}"
+	done
+	[ -n "$setup_wifi" ] && /sbin/wifi up
+	exit
+else
+	ubus -S list "network.interface.$1" > /dev/null || {
+		echo "Interface $1 not found"
+		exit
+	}
+	if_call "$1"
+fi
+
+if [ -n "$setup_wifi" ] && grep -sq config /etc/config/wireless; then
+	. /lib/functions.sh
+
+	find_related_radios() {
+		local wdev wnet
+		config_get wdev "$1" device
+		config_get wnet "$1" network
+
+		if [ -n "$wdev" ]; then
+			for wnet in $wnet; do
+				if [ "$wnet" = "$network" ]; then
+					append radio_devs "$wdev" "$N"
+				fi
+			done
+		fi
+	}
+
+	network="$1"
+	config_load wireless
+	config_foreach find_related_radios wifi-iface
+
+	for dev in $(echo "$radio_devs" | sort -u); do
+		/sbin/wifi up "$dev"
+	done
+fi
diff --git a/netifd/files/usr/share/udhcpc/default.script b/netifd/files/usr/share/udhcpc/default.script
new file mode 100755
index 0000000..ac765a6
--- /dev/null
+++ b/netifd/files/usr/share/udhcpc/default.script
@@ -0,0 +1,57 @@
+#!/bin/sh
+[ -z "$1" ] && echo "Error: should be run by udhcpc" && exit 1
+
+set_classless_routes() {
+	local max=128
+	local type
+	while [ -n "$1" -a -n "$2" -a $max -gt 0 ]; do
+		[ ${1##*/} -eq 32 ] && type=host || type=net
+		echo "udhcpc: adding route for $type $1 via $2"
+		route add -$type "$1" gw "$2" dev "$interface"
+		max=$(($max-1))
+		shift 2
+	done
+}
+
+setup_interface() {
+	echo "udhcpc: ifconfig $interface $ip netmask ${subnet:-255.255.255.0} broadcast ${broadcast:-+}"
+	ifconfig $interface $ip netmask ${subnet:-255.255.255.0} broadcast ${broadcast:-+}
+
+	[ -n "$router" ] && [ "$router" != "0.0.0.0" ] && [ "$router" != "255.255.255.255" ] && {
+		echo "udhcpc: setting default routers: $router"
+
+		local valid_gw=""
+		for i in $router ; do
+			route add default gw $i dev $interface
+			valid_gw="${valid_gw:+$valid_gw|}$i"
+		done
+		
+		eval $(route -n | awk '
+			/^0.0.0.0\W{9}('$valid_gw')\W/ {next}
+			/^0.0.0.0/ {print "route del -net "$1" gw "$2";"}
+		')
+	}
+
+	# CIDR STATIC ROUTES (rfc3442)
+	[ -n "$staticroutes" ] && set_classless_routes $staticroutes
+	[ -n "$msstaticroutes" ] && set_classless_routes $msstaticroutes
+}
+
+
+applied=
+case "$1" in
+	deconfig)
+		ifconfig "$interface" 0.0.0.0
+	;;
+	renew)
+		setup_interface update
+	;;
+	bound)
+		setup_interface ifup
+	;;
+esac
+
+# user rules
+[ -f /etc/udhcpc.user ] && . /etc/udhcpc.user
+
+exit 0
diff --git a/netifd/patches/utils-fix-check_pid_path-to-work-with-delted-file-as.patch b/netifd/patches/utils-fix-check_pid_path-to-work-with-delted-file-as.patch
new file mode 100644
index 0000000..82a6441
--- /dev/null
+++ b/netifd/patches/utils-fix-check_pid_path-to-work-with-delted-file-as.patch
@@ -0,0 +1,69 @@
+From 8ce3d13d9ba56543c2d627fd429fab171b40994e Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
+Date: Thu, 28 May 2020 10:43:44 +0200
+Subject: [PATCH] utils: fix check_pid_path to work with delted file as well
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+check_pid_patch is checking if process with given PID and executable
+path is running. If this code fails the rest of the code can be
+convinced that program is no longer running and possibly spawns new
+instance that can collide with already running one. This behavior was
+reproduced with hostapd.
+
+Symbolic link exe in process subdirectory in /proc points to original
+executable. The problem is that it reads as original path plus string
+' (deleted)' if file is removed. The process is still running but
+original file is no longer available on files ystem.
+
+This behavior is triggered not only when file is removed (unlinked) but
+also when file is replaced. This happens clearly on package update. In
+general this happens any time all references (hard links) to file are
+removed from file system.
+
+This is not ultimate fix as exe link points to any last reference on
+file system with preference for original one. The problem is if there
+are multiple references and the original one is removed. This can be
+reproduced just by copying executable (hard linking) and unlinking the
+original one. In such case exe link would point to copy and not to
+original deleted one.
+
+Signed-off-by: Karel Kočí <cynerd@email.cz>
+---
+ utils.c | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+diff --git a/utils.c b/utils.c
+index ba26952..4f40b4b 100644
+--- a/utils.c
++++ b/utils.c
+@@ -176,6 +176,8 @@ crc32_file(FILE *fp)
+ 
+ bool check_pid_path(int pid, const char *exe)
+ {
++	const char deleted[] = " (deleted)";
++	const int deleted_len = strlen(deleted);
+ 	int proc_exe_len;
+ 	int exe_len = strlen(exe);
+ 
+@@ -191,10 +193,13 @@ bool check_pid_path(int pid, const char *exe)
+ 	proc_exe_len = readlink(proc_exe, proc_exe_buf, exe_len);
+ #endif
+ 
+-	if (proc_exe_len != exe_len)
++	if (proc_exe_len == exe_len)
++		return !memcmp(exe, proc_exe_buf, exe_len);
++	else if (proc_exe_len == exe_len + deleted_len)
++		return !memcmp(exe, proc_exe_buf, exe_len) &&
++			!memcmp(exe + exe_len, deleted, deleted_len);
++	else
+ 		return false;
+-
+-	return !memcmp(exe, proc_exe_buf, exe_len);
+ }
+ 
+ static const char * const uci_validate_name[__BLOBMSG_TYPE_LAST] = {
+-- 
+2.26.2
+