Add fff-gre package

This package adds gateway.d scripts which create
peering interfaces using grev6.

Signed-off-by: Fabian Bläse <fabian@blaese.de>

src/packages/fff/fff-gre/Makefile

@@ -0,0 +1,43 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=fff-gre
+PKG_VERSION:=1
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/fff-gre
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/fff-gre
+	SECTION:=base
+	CATEGORY:=Freifunk
+	TITLE:=Freifunk-Franken gre
+	URL:=https://www.freifunk-franken.de
+	DEPENDS:=+gre \
+			 +@PACKAGE_grev4 \
+			 +@PACKAGE_grev6 \
+			 +fff-network
+endef
+
+define Package/fff-gre/description
+	This is the Freifunk Franken Firmware gre package.
+	This package provides configuration scripts for gre tunnels.
+endef
+
+define Build/Prepare
+	echo "all: " > $(PKG_BUILD_DIR)/Makefile
+endef
+
+define Build/Configure
+	# nothing
+endef
+
+define Build/Compile
+	# nothing
+endef
+
+define Package/fff-gre/install
+	$(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,fff-gre))

src/packages/fff/fff-gre/files/etc/gateway.d/50-gre

@@ -0,0 +1,114 @@
+. /lib/functions.sh
+. /lib/functions/fff/network
+. /lib/functions/fff/babel
+
+#load board specific properties
+BOARD="$(uci get board.model.name)"
+. /etc/network.$BOARD
+
+configure() {
+	# remove peers missing in gateway config
+	remove_gre6peer() {
+		local name="$1"
+
+		# check prefix
+		if [ "$name" = "${name#gre_}" ]; then
+			return
+		fi
+
+		if ! uci -q get gateway.${name#gre_} > /dev/null; then
+				# remove interfaces
+				uci -q del network.$name
+				uci -q del network.${name}_ip
+
+				# remove iif-rules
+				babel_delete_iifrules "$name"
+				# remove babel interface
+				babel_delete_interface "$name"
+		fi
+	}
+
+	config_load babeld
+	config_foreach remove_gre6peer interface
+
+
+	# add new peers
+	add_gre6peer() {
+		local name="$1"
+		local prefixname="gre_$name"
+		local ip6addr
+		local peer6addr
+		local mtu
+
+		# ensure name length
+		if [ ${#name} -gt 5 ]; then
+			echo "ERROR: name $name is too long!"
+			exit 1
+		fi
+
+		# get rxcost
+		if rxcost=$(uci -q get gateway.$name.rxcost); then
+			rxcost="$rxcost"
+		else
+			rxcost=16384
+		fi
+
+		# get addresses properties
+		if ! ip6addr=$(uci -q get gateway.$name.ip6addr); then
+			echo "ERROR: No ip6addr set for gre6peer $name!"
+			exit 1
+		fi
+
+		if ! peer6addr=$(uci -q get gateway.$name.peer6addr); then
+			echo "ERROR: No peer6addr set for gre6peer $name!"
+			exit 1
+		fi
+
+		mtu=$(uci -q get gateway.$name.mtu)
+
+
+		# add interface
+		uci set network.$prefixname=interface
+		uci set network.$prefixname.proto=grev6
+		uci set network.$prefixname.nohostroute='1'
+		uci set network.$prefixname.tunlink='wan'
+		uci set network.$prefixname.mtu="${mtu:-1448}"
+		uci set network.$prefixname.ip6addr="$ip6addr"
+		uci set network.$prefixname.peer6addr="$peer6addr"
+
+		# remove old addresses
+		uci -q del network.${prefixname}_ip.ip6addr
+		uci -q del network.${prefixname}_ip.ipaddr
+
+		# logical interface for adding ips
+		uci set network.${prefixname}_ip=interface
+		uci set network.${prefixname}_ip.proto=static
+		uci set network.${prefixname}_ip.ifname="@$prefixname"
+
+		# add link local address
+		uci add_list network.${prefixname}_ip.ip6addr="$(ipEUIAssemble "fe80::/64" "$ROUTERMAC")"
+
+		# peer_ip
+		babel_add_peeraddr "network.${prefixname}_ip.ipaddr"
+		babel_add_peer6addr "network.${prefixname}_ip.ip6addr"
+
+		# add iif-rules
+		babel_add_iifrules "$prefixname" || { echo "ERROR: Could not add iif-rules for gre6eer $name"; exit 1; }
+
+		# add babel interface
+		babel_add_interface "$prefixname" "$prefixname" 'tunnel' "$rxcost" || { echo "ERROR: Could not add babeld interface for gre6eer $name"; exit 1; }
+	}
+
+	config_load gateway
+	config_foreach add_gre6peer gre6peer
+}
+
+commit() {
+	uci commit network
+	uci commit babeld
+}
+
+revert() {
+	uci revert network
+	uci revert babeld
+}

src/packages/fff/fff-layer3/Makefile

@@ -14,6 +14,7 @@ define Package/fff-layer3
 	         +fff-babeld \
 	         +fff-boardname \
 	         +fff-dhcp \
+		 +fff-gre \
 	         +fff-layer3-config \
 	         +fff-network \
 	         +fff-ra \
@@ -25,9 +26,6 @@ define Package/fff-layer3
 	         +kmod-ebtables-ipv4 \
 	         +kmod-ebtables-ipv6 \
 	         +kmod-sched-cake \
-	         +gre \
-	         +@PACKAGE_grev4 \
-	         +@PACKAGE_grev6 \
 	         +iperf3 \
 	         +ip-full \
 	         +iptables-mod-filter \