tayga: Add Netifd support

This patch integrates tayga with netifd. Parametres are nearly same as
with the older scripts. Support for static mapping of IPv4<=>IPv6 addresses
is missing. Example configuration:

config interface 'nat64'
        option proto 'tayga'
        option prefix 64:ff9b::/96
        option dynamic_pool 10.128.0.0/24
        option ipv4_addr 10.128.0.1	#address of the TAYGA itself
        option ipv6_addr 2001:470:5990::64
        option ipaddr  192.168.1.1 #optional address of TUN interface
        option ip6addr 2001:db8::1

Signed-off-by: Ondrej Caletka <ondrej@caletka.cz>

ipv6/tayga/Makefile

@@ -4,7 +4,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tayga
 PKG_VERSION:=0.9.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=tayga-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=http://www.litech.org/tayga/
@@ -31,11 +31,11 @@ define Package/tayga/description
   kernel, which is the same driver used by OpenVPN and QEMU/KVM.
 endef
 
-# TODO: port scripts to netifd
-ifdef CONFIG_PACAKGE_netifd
+ifdef CONFIG_PACKAGE_netifd
   define Package/tayga/install
-	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_DIR) $(1)/usr/sbin $(1)/lib/netifd/proto
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/tayga $(1)/usr/sbin/
+	$(INSTALL_BIN) ./files/tayga-proto.sh $(1)/lib/netifd/proto/tayga.sh
   endef
 else
   define Package/tayga/install

ipv6/tayga/files/tayga-proto.sh

@@ -0,0 +1,92 @@
+#!/bin/sh
+# tayga.sh - TAYGA proto
+# Copyright (c) 2014 OpenWrt.org
+
+[ -n "$INCLUDE_ONLY" ] || {
+	. /lib/functions.sh
+	. /lib/functions/network.sh
+	. ../netifd-proto.sh
+	init_proto "$@"
+}
+
+proto_tayga_setup() {
+	local cfg="$1"
+	local iface="$2"
+	local link="tayga-$cfg"
+
+	local ipv4_addr ipv6_addr prefix dynamic_pool ipaddr ip6addr
+	json_get_vars ipv4_addr ipv6_addr prefix dynamic_pool ipaddr ip6addr
+	[ -z "$ipv4_addr" -o -z "$prefix" ] && {
+		proto_notify_error "$cfg" "REQUIRED_PARAMETERS_MISSING"
+		proto_block_restart "$cfg"
+		return
+	}
+
+	local tmpconf="/var/etc/tayga-$cfg.conf"
+	mkdir -p /var/etc
+	mkdir -p /var/run/tayga/$cfg
+
+	echo "tun-device $link" >$tmpconf
+	echo "ipv4-addr $ipv4_addr" >>$tmpconf
+	[ -n "$ipv6_addr" ] &&
+		echo "ipv6-addr $ipv6_addr" >>$tmpconf
+	[ -n "$prefix" ] &&
+		echo "prefix $prefix" >>$tmpconf
+	[ -n "$dynamic_pool" ] &&
+		echo "dynamic-pool $dynamic_pool" >>$tmpconf
+	echo "data-dir /var/run/tayga/$cfg" >>$tmpconf
+	#TODO: Support static mapping of IPv4 <-> IPv6
+
+	# here we create TUN device and check configuration
+	tayga -c $tmpconf --mktun
+	[ "$?" -ne 0 ] && {
+		proto_notify_error "$cfg" "TAYGA_FAILED"
+		proto_block_restart "$cfg"
+		return
+	}
+
+	proto_init_update "$link" 1
+
+	[ -n "$ipaddr" ]  && proto_add_ipv4_address "$ipaddr" "255.255.255.255"
+	[ -n "$ip6addr" ] && proto_add_ipv6_address "$ip6addr" "128"
+	[ -n "$ipv6_addr" ] && proto_add_ipv6_route "$ipv6_addr" "128"
+	[ -n "$dynamic_pool" ] && {
+		local pool="${dynamic_pool%%/*}"
+		local mask="${dynamic_pool##*/}"
+		proto_add_ipv4_route "$pool" "$mask"
+	}
+	[ -n "$prefix" ] && {
+		local prefix6="${prefix%%/*}"
+		local mask6="${prefix##*/}"
+		proto_add_ipv6_route "$prefix6" "$mask6"
+	}
+
+	proto_send_update "$cfg"
+
+	proto_run_command "$cfg" tayga -n -c $tmpconf \
+		-p /var/run/$link.pid
+
+}
+
+proto_tayga_teardown() {
+	local cfg="$1"
+	local tmpconf="/var/etc/tayga-$cfg.conf"
+	proto_kill_command "$cfg"
+	sleep 1
+	tayga -c $tmpconf --rmtun
+}
+
+proto_tayga_init_config() {
+	no_device=1
+	available=1
+	proto_config_add_string "ipv4_addr"
+	proto_config_add_string "ipv6_addr"
+	proto_config_add_string "prefix"
+	proto_config_add_string "dynamic_pool"
+	proto_config_add_string "ipaddr"
+	proto_config_add_string "ip6addr:ip6addr"
+}
+
+[ -n "$INCLUDE_ONLY" ] || {
+	add_protocol tayga
+}