Add support for different babel implementations

To be able to swap out babeld for a different babel implementation in
the future, this splits all fff-specific configuration into a seperate
fff-babel package.

Implementation specific configuration is done in
/lib/functions/fff/babeldaemon, which is included with every selectable
babel implementation. It contains functions, which are called by the
fff-specific code, and therefore allows to configure the implementation
specific parts.

The babel implementation is provided by implementation-specific
fff-packages, which provide 'fff-babel-implementation'. At the moment,
only fff-babeld is supported for use as babel implementation.

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

src/packages/fff/fff-babel/Makefile

@@ -0,0 +1,28 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=fff-babel
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/fff-babel
+	SECTION:=base
+	CATEGORY:=Freifunk
+	TITLE:=Freifunk-Franken babel
+	URL:=https://www.freifunk-franken.de
+	DEPENDS:=+fff-babel-implementation
+endef
+
+define Package/fff-babel/description
+	This is the Freifunk Franken Firmware babel package.
+endef
+
+define Build/Compile
+	# nothing
+endef
+
+define Package/fff-babel/install
+	$(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,fff-babel))

src/packages/fff/fff-babel/files/etc/layer3.d/40-babel

@@ -26,7 +26,7 @@ configure() {
 		fi
 	}
 
-	config_load babeld
+	config_load network
 	config_foreach remove_babelpeer interface
 
 	#add new peers
@@ -75,14 +75,14 @@ configure() {
 		babel_add_peer6addr "network.$prefixname.ip6addr"
 
 		# add babel interface
-		babel_add_interface "$prefixname" "$iface" "$type" "$rxcost" || { echo "Could not add babeld interface for babelpeer $name"; exit 1; }
+		babel_add_interface "$prefixname" "$iface" "$type" "$rxcost" || { echo "Could not add babel interface for babelpeer $name"; exit 1; }
 	}
 
 	config_load gateway
 	config_foreach add_babelpeer babelpeer
 
 
-	# configure babeld filters for custom ipv6 addresses
+	# configure babel filters for custom ipv6 addresses
 	## remove old filters
 	babel_remove_custom_redistribute_filters
 
@@ -94,10 +94,14 @@ configure() {
 
 apply() {
 	uci commit network
-	uci commit babeld
+	babel_apply
+}
+
+reload() {
+	babel_reload
 }
 
 revert() {
 	uci revert network
-	uci revert babeld
+	babel_revert
 }

src/packages/fff/fff-babel/files/lib/functions/fff/babel

@@ -1,3 +1,5 @@
+. /lib/functions/fff/babeldaemon
+
 babel_add_iifrules() {
 	[ "$#" -ne "1" ] && return 1
 
@@ -60,62 +62,3 @@ babel_add_peer6addr() {
 
 	return 0
 }
-
-babel_add_interface() {
-	[ "$#" -ne "4" ] && return 1
-
-	local name="$1"
-	local interface="$2"
-	local type="$3"
-	local rxcost="$4"
-
-	uci set babeld.$name=interface
-	uci set babeld.$name.ifname="$interface"
-	uci set babeld.$name.type="$type"
-	uci set babeld.$name.rxcost="$rxcost"
-
-	return 0
-}
-
-babel_delete_interface() {
-	[ "$#" -ne "1" ] && return 1
-
-	local name="$1"
-
-	uci -q del babeld.$name
-
-	return 0
-}
-
-babel_add_redistribute_filter() {
-	[ "$#" -ne "1" ] && return 1
-
-	local prefix="$1"
-
-	config=$(uci add babeld filter)
-	uci set babeld.$config.type='redistribute'
-	uci set babeld.$config.ip="$prefix"
-	uci set babeld.$config.addedbyautoconfig='true'
-
-	return 0
-}
-
-babel_remove_custom_redistribute_filters() {
-	[ "$#" -ne "0" ] && return 1
-
-	remove_filters() {
-		local name="$1"
-
-		# check if filter was added by configuregateway
-		if ! [ "$(uci -q get babeld.$name.addedbyautoconfig)" = 'true' ]; then
-			return
-		fi
-
-		uci -q del babeld.$name
-	}
-
-	config_load babeld
-	config_foreach remove_filters filter
-
-	return 0
-}

src/packages/fff/fff-babeld/Makefile

@@ -11,6 +11,7 @@ define Package/fff-babeld
 	TITLE:=Freifunk-Franken babeld configuration example
 	URL:=http://www.freifunk-franken.de
 	DEPENDS:=+babeld
+	PROVIDES:=fff-babel-implementation
 endef
 
 define Package/fff-babeld/description

src/packages/fff/fff-babeld/files/lib/functions/fff/babeldaemon

@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: GPL-3.0-only
+
+babel_add_interface() {
+	[ "$#" -ne "4" ] && return 1
+
+	local name="$1"
+	local interface="$2"
+	local type="$3"
+	local rxcost="$4"
+
+	uci set babeld.$name=interface
+	uci set babeld.$name.ifname="$interface"
+	uci set babeld.$name.type="$type"
+	uci set babeld.$name.rxcost="$rxcost"
+
+	return 0
+}
+
+babel_delete_interface() {
+	[ "$#" -ne "1" ] && return 1
+
+	local name="$1"
+
+	uci -q del babeld.$name
+
+	return 0
+}
+
+babel_add_redistribute_filter() {
+	[ "$#" -ne "1" ] && return 1
+
+	local prefix="$1"
+
+	config=$(uci add babeld filter)
+	uci set babeld.$config.type='redistribute'
+	uci set babeld.$config.ip="$prefix"
+	uci set babeld.$config.addedbyautoconfig='true'
+
+	return 0
+}
+
+babel_remove_custom_redistribute_filters() {
+	[ "$#" -ne "0" ] && return 1
+
+	remove_filters() {
+		local name="$1"
+
+		# check if filter was added by configuregateway
+		if ! [ "$(uci -q get babeld.$name.addedbyautoconfig)" = 'true' ]; then
+			return
+		fi
+
+		uci -q del babeld.$name
+	}
+
+	config_load babeld
+	config_foreach remove_filters filter
+
+	return 0
+}
+
+babel_apply() {
+	uci commit babeld
+}
+
+babel_reload() {
+	return 0
+}
+
+babel_revert() {
+	uci revert babeld
+}

src/packages/fff/fff-layer3/Makefile

@@ -11,6 +11,7 @@ define Package/fff-layer3
 	TITLE:=Freifunk-Franken gateway configuration
 	URL:=https://www.freifunk-franken.de
 	DEPENDS:=+fff-alfred-monitoring-proxy \
+	         +fff-babel \
 	         +fff-babeld \
 	         +fff-boardname \
 	         +fff-dhcp \

src/packages/fff/fff-wireguard/Makefile

@@ -14,7 +14,7 @@ define Package/fff-wireguard
 		+kmod-wireguard \
 		+owipcalc \
 		+wireguard-tools \
-		+fff-babeld \
+		+fff-babel \
 		+fff-network
 endef
 

src/packages/fff/fff-wireguard/files/etc/layer3.d/50-wireguard

@@ -30,7 +30,7 @@ configure() {
 		fi
 	}
 
-	config_load babeld
+	config_load network
 	config_foreach remove_wgpeer interface
 
 
@@ -127,7 +127,7 @@ configure() {
 		babel_add_iifrules "$prefixname" || { echo "ERROR: Could not add iif-rules for wgpeer $name"; exit 1; }
 
 		# add babel interface
-		babel_add_interface "$prefixname" "$prefixname" 'wired' "$rxcost" || { echo "ERROR: Could not add babeld interface for wgpeer $name"; exit 1; }
+		babel_add_interface "$prefixname" "$prefixname" 'wired' "$rxcost" || { echo "ERROR: Could not add babel interface for wgpeer $name"; exit 1; }
 	}
 
 	config_load gateway
@@ -136,12 +136,16 @@ configure() {
 
 apply() {
 	uci commit network
-	uci commit babeld
 	uci commit gateway
+	babel_apply
+}
+
+reload() {
+	babel_reload
 }
 
 revert() {
 	uci revert network
-	uci revert babeld
 	uci revert gateway
+	babel_revert
 }