add vfconfig

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/network/config/vfconfig/Makefile

@@ -0,0 +1,40 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=vfconfig
+PKG_RELEASE:=1
+PKG_LICENSE:=GPL-2.0
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/vfconfig
+  SECTION:=net
+  CATEGORY:=Network
+  MAINTAINER:=Jo-Philipp Wich <jo@mein.io>
+  TITLE:=UCI configuration support for VLAN filtering rules
+  DEPENDS:= +ip-bridge +ip-full
+  PKGARCH:=all
+endef
+
+define Package/vfconfig/description
+ This package provides UCI configuration abstraction for VLAN filter rules
+ on top of Linux bridge interfaces.
+endef
+
+define Build/Compile
+endef
+
+define Build/Configure
+endef
+
+define Package/vfconfig/install
+	$(INSTALL_DIR) $(1)/etc/hotplug.d/iface
+	$(INSTALL_DATA) ./files/vfconfig.hotplug $(1)/etc/hotplug.d/iface/01-vfconfig
+
+	$(INSTALL_DIR) $(1)/lib/network
+	$(INSTALL_DATA) ./files/vfconfig.include $(1)/lib/network/vfconfig.sh
+
+	$(INSTALL_DIR) $(1)/sbin
+	$(INSTALL_BIN) ./files/vfconfig.sh $(1)/sbin/vfconfig
+endef
+
+$(eval $(call BuildPackage,vfconfig))

package/network/config/vfconfig/files/vfconfig.hotplug

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ "$ACTION" = ifup ] && [ "$INTERFACE" = loopback ]; then
+	. /lib/network/dsaconfig.sh
+	setup_switch
+fi
+

package/network/config/vfconfig/files/vfconfig.include

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+setup_switch() {
+	# Skip switch setup on network restart. The netifd process
+	# will be started afterwards and remove all interfaces again...
+	if [ "$initscript" = /etc/init.d/network ] && [ "$action" = restart ]; then
+		return 0
+	fi
+
+	/sbin/dsaconfig apply 2>&1 | logger -t dsaconfig
+}

package/network/config/vfconfig/files/vfconfig.sh

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+. /lib/functions.sh
+. /lib/functions/network.sh
+
+bridge_names=""
+
+warn() {
+	echo "$@" >&2
+}
+
+clear_port_vlans() {
+	local port=$1
+	local self=$2
+	local vlans=$(bridge vlan show dev "$port" | sed -ne 's#^[^ ]* \+\([0-9]\+\).*$#\1#p')
+
+	local vlan
+	for vlan in $vlans; do
+		bridge vlan del vid "$vlan" dev "$port" $self
+	done
+}
+
+add_bridge() {
+	local cfg=$1
+	local brname
+
+	config_get brname "$cfg" bridge "switch0"
+
+	case " $bridge_names " in
+		*" $brname "*) return 1 ;;
+	esac
+
+	append bridge_names "$brname"
+
+	export -n "bridge=$brname"
+}
+
+validate_vid() {
+	local vid=$1
+
+	case "$vid" in
+		[1-9]|[1-9][0-9]|[1-9][0-9][0-9]|[1-4][0-9][0-9][0-9])
+			if [ $vid -gt 4096 ]; then
+				return 1
+			fi
+		;;
+		*)
+			return 1
+		;;
+	esac
+
+	return 0
+}
+
+setup_bridge() {
+	local cfg=$1
+	local bridge
+
+	add_bridge "$cfg" || return 0
+
+	# Prevent netifd from picking up our switch bridge just yet
+	network_defer_device "$bridge"
+
+	# (Re)create switch bridge device in case it is not yet set up
+	local filtering=$(cat "/sys/class/net/$bridge/bridge/vlan_filtering" 2>/dev/null)
+	if [ ${filtering:-0} != 1 ]; then
+		ip link set "$bridge" down 2>/dev/null
+		ip link delete dev "$bridge" 2>/dev/null
+		ip link add name "$bridge" type bridge
+		echo 1 > "/sys/class/net/$bridge/bridge/vlan_filtering"
+	fi
+
+	ip link set "$bridge" up
+
+	# Unbridge DSA ports and flush any VLAN filters on them, they're added back later
+	local port
+	for port in /sys/class/net/*"/upper_${cfg}"; do
+		if [ -e "$port" ]; then
+			port=${port%/upper_*}
+			port=${port##*/}
+
+			ip link set "$port" nomaster
+
+			# Unbridging the port should already clear VLANs, but be safe
+			clear_port_vlans "$port"
+		fi
+	done
+
+	# Clear any VLANs on the switch bridge, they're added back later
+	clear_port_vlans "$bridge" self
+}
+
+setup_bridge_vlan() {
+	local cfg=$1
+	local bridge vlan ports
+
+	config_get bridge "$cfg" bridge "switch0"
+	config_get vlan "$cfg" vlan
+	config_get ports "$cfg" ports
+
+	validate_vid "$vlan" || {
+		warn "VLAN section '$cfg' specifies an invalid VLAN ID '$vlan'"
+		return 1
+	}
+
+	# Setup ports
+	local port tag pvid
+	for port in $ports; do
+		tag=untagged
+		pvid=
+
+		case "$port" in
+			*"*")
+				pvid=pvid
+				port=${port%\*}
+			;;
+		esac
+
+		case "$port" in
+			*:u)
+				port=${port%:u}
+			;;
+			*:t)
+				tag=tagged
+				port=${port%:t}
+			;;
+		esac
+
+		# Add the port to the switch bridge and delete the default
+		# VLAN 1 if it is not yet joined to the bridge.
+		if [ ! -e "/sys/class/net/$port/upper_$bridge" ]; then
+			ip link set dev "$port" up
+			ip link set dev "$port" master "$bridge"
+
+			# Get rid of default VLAN 1
+			bridge vlan del vid 1 dev "$port"
+		fi
+
+		# Promote the first untagged VLAN of this port to the PVID
+		if [ "$tag" = untagged ] && ! bridge vlan show dev "$port" | grep -qi pvid; then
+			pvid=pvid
+		fi
+
+		# Add VLAN filter entry for port
+		bridge vlan add dev "$port" vid $vlan $pvid $tag
+	done
+
+	# Make the switch bridge itself handle the VLAN as well
+	bridge vlan add dev "$bridge" self vid $vlan tagged
+}
+
+apply_config() {
+	config_load network
+	config_foreach setup_bridge vlan_filter
+	config_foreach setup_bridge_vlan vlan_filter
+
+	# Ready switch bridge devices
+	local bridge
+	for bridge in $bridge_names; do
+		network_ready_device "$bridge"
+	done
+}
+
+show_bridge() {
+	local cfg=$1
+	local bridge
+
+	add_bridge "$cfg" || return 0
+
+	printf "Bridge: %s\n" "$bridge"
+	printf "VLAN/"
+
+	local port ports
+	for port in "/sys/class/net/$bridge/lower_"*; do
+		[ -e "$port" ] || continue
+
+		port=${port##*/lower_}
+
+		printf " | %-5s" "$port"
+		append ports "$port"
+	done
+
+	printf " |\nLink:"
+
+	for port in $ports; do
+		local carrier=$(cat "/sys/class/net/$port/carrier")
+		local duplex=$(cat "/sys/class/net/$port/duplex")
+		local speed=$(cat "/sys/class/net/$port/speed")
+
+		if [ ${carrier:-0} -eq 0 ]; then
+			printf " | %-5s" "down"
+		else
+			[ "$duplex" = "full" ] && duplex=F || duplex=H
+			printf " | %4d%s" "$speed" "$duplex"
+		fi
+	done
+
+	local vlans=$(bridge vlan show dev "$bridge" | sed -ne 's#^[^ ]* \+\([0-9]\+\).*$#\1#p')
+	local vlan
+	for vlan in $vlans; do
+		printf " |\n%4d " "$vlan"
+
+		for port in $ports; do
+			local pvid="" utag="" word
+			for word in $(bridge vlan show dev "$port" vid "$vlan"); do
+				case "$word" in
+					PVID) pvid="*" ;;
+					"$vlan") utag="t" ;;
+					Untagged) utag="u" ;;
+				esac
+			done
+
+			printf " |  %-2s  " "$utag$pvid"
+		done
+	done
+
+	printf " |\n\n"
+}
+
+show_config() {
+	config_load network
+	config_foreach show_bridge vlan_filter
+}
+
+
+case "$1" in
+	show) show_config ;;
+	apply) apply_config ;;
+	*)
+		echo "Usage: ${0##*/} show"
+		echo "       ${0##*/} apply"
+		exit 1
+	;;
+esac