uradvd: add new package

Send IPv6 router advertisments.

Signed-off-by: Moritz Warning <moritzwarning@web.de>
Co-authored-by: Matthias Schiffer <mschiffer@universe-factory.net>

net/uradvd/Makefile

@@ -0,0 +1,37 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=uradvd
+PKG_RELEASE:=1
+
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_URL=https://github.com/freifunk-gluon/uradvd.git
+PKG_SOURCE_DATE:=2021-09-14
+PKG_SOURCE_VERSION:=9b0da60e27c67305d251b10163e388191d566d7a
+PKG_MIRROR_HASH=c3c9cb5d3a7b30503bff64541bbcaffa84b33e0de39560a5efae077df4e9b134
+
+PKG_MAINTAINER:=Moritz Warning <moritzwarning@web.de>
+PKG_LICENSE:=BSD-2-Clause
+PKG_LICENSE_FILES:=LICENSE
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/uradvd
+  SECTION:=net
+  CATEGORY:=Network
+  TITLE:=A tiny radvd
+endef
+
+define Package/uradvd/description
+	 Advertise an IPv6 prefix/route via SLAAC.
+endef
+
+define Package/uradvd/install
+	$(INSTALL_DIR) $(1)/etc/config/
+	$(INSTALL_DATA) ./files/uradvd.config $(1)/etc/config/
+	$(INSTALL_DIR) $(1)/etc/init.d/
+	$(INSTALL_BIN) ./files/uradvd.init $(1)/etc/init.d/
+	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/uradvd $(1)/usr/sbin/
+endef
+
+$(eval $(call BuildPackage,uradvd))

net/uradvd/files/uradvd.config

@@ -0,0 +1,11 @@
+
+config interface
+	option enabled '0'
+	# send router advertisment over this device
+	# alternative: option device 'lan'
+	option ifname 'br-lan'
+	# lifetime of the default route (in seconds)
+	option default_lifetime '0'
+	list prefix_on_link '300::/64'
+	list prefix_off_link '200::/64'
+	list dns '2001:4860:4860::8888'

net/uradvd/files/uradvd.init

@@ -0,0 +1,72 @@
+#!/bin/sh /etc/rc.common
+
+START=50
+USE_PROCD=1
+ARGS=""
+
+append_prefix_off_link() {
+	ARGS="$ARGS -a $1"
+}
+
+append_prefix_on_link() {
+	ARGS="$ARGS -p $1"
+}
+
+append_dns() {
+	ARGS="$ARGS --rdnss $1"
+}
+
+start_instance() {
+	local cfg="$1" enabled device ifname default_lifetime
+
+	ARGS=""
+
+	config_get_bool enabled $cfg 'enabled' 1
+	config_get device $cfg 'device'
+	config_get ifname $cfg 'ifname'
+	config_get default_lifetime $cfg 'default_lifetime'
+
+	if [ "$enabled" != "1" ]; then
+		exit 0
+	fi
+
+	if [ -n "$device" ] && [ -n "$ifname" ]; then
+		echo "either set device or ifname" >&2
+		exit 1
+	fi
+
+	if [ -z "$device" ] && [ -z "$ifname" ]; then
+		echo "either set device or ifname" >&2
+		exit 1
+	fi
+
+	if [ -z "$ifname" ]; then
+		network_get_device 'ifname' "$ifname"
+	fi
+
+	if [ -z "$ifname" ]; then
+		echo "no valid device or ifname set" >&2
+		exit 1
+	fi
+
+	if [ -n "$default_lifetime" ]; then
+		ARGS="$ARGS --default-lifetime $default_lifetime"
+	fi
+
+	ARGS="$ARGS -i $ifname"
+
+
+	config_list_foreach $cfg 'prefix_off_link' append_prefix_off_link
+	config_list_foreach $cfg 'prefix_on_link' append_prefix_on_link
+	config_list_foreach $cfg "dns" append_dns
+
+	procd_open_instance
+	procd_set_param command /usr/sbin/uradvd $ARGS
+	procd_set_param respawn
+	procd_close_instance
+}
+
+start_service() {
+	config_load uradvd
+	config_foreach start_instance interface
+}