IPIP: IP in IP package support

The package supports IP in IP by registering the ipip protocol handler

Following options are configurable
    -peeraddr (IPv4 remote address)
    -ipaddr (IPv4 local address)
    -ttl (time to live of encapsulating packet)
    -tos (type of service of encapsulating packet either inherit (outer header inherits the value of the inner header) or hex value)
    -df (don't fragment flag of encapsulating packet)
    -mtu (IPIP tunnel mtu)
    -tunlink (bind tunnel to this interface)
    -zone (firewall zone to which the IPIP tunnel will be added)

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

SVN-Revision: 42746

package/network/config/ipip/Makefile

@@ -0,0 +1,39 @@
+#
+# Copyright (C) 2014 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=ipip
+PKG_VERSION:=1
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/ipip
+  SECTION:=net
+  CATEGORY:=Network
+  MAINTAINER:=Hans Dedecker <dedeckeh@gmail.com>
+  TITLE:=IP in IP Tunnel config support
+  DEPENDS:= +kmod-ipip
+endef
+
+define Package/ipip/description
+ IP in IP Tunnel config support in /etc/config/network.
+endef
+
+define Build/Compile
+endef
+
+define Build/Configure
+endef
+
+define Package/ipip/install
+	$(INSTALL_DIR) $(1)/lib/netifd/proto
+	$(INSTALL_BIN) ./files/ipip.sh $(1)/lib/netifd/proto/ipip.sh
+endef
+
+$(eval $(call BuildPackage,ipip))

package/network/config/ipip/files/ipip.sh

@@ -0,0 +1,80 @@
+#!/bin/sh
+
+[ -n "$INCLUDE_ONLY" ] || {
+	. /lib/functions.sh
+	. /lib/functions/network.sh
+	. ../netifd-proto.sh
+	init_proto "$@"
+}
+
+proto_ipip_setup() {
+	local cfg="$1"
+
+	local df ipaddr peeraddr tunlink ttl tos zone mtu
+	json_get_vars df ipaddr peeraddr tunlink ttl tos zone mtu
+
+	[ -z "$peeraddr" ] && {
+		proto_notify_error "$cfg" "MISSING_ADDRESS"
+		proto_block_restart "$cfg"
+		return
+	}
+
+	( proto_add_host_dependency "$cfg" "$peeraddr" "$tunlink" )
+
+	[ -z "$ipaddr" ] && {
+		local wanif="$tunlink"
+		if [ -z $wanif ] && ! network_find_wan wanif; then
+			proto_notify_error "$cfg" "NO_WAN_LINK"
+			return
+		fi
+
+		if ! network_get_ipaddr ipaddr "$wanif"; then
+			proto_notify_error "$cfg" "NO_WAN_LINK"
+			return
+		fi
+	}
+
+	[ -z "$zone" ] && zone="wan"
+
+	proto_init_update "ipip-$cfg" 1
+
+	proto_add_tunnel
+	json_add_string mode "ipip"
+	json_add_int mtu "${mtu:-1280}"
+	json_add_int ttl "${ttl:-64}"
+	[ -n "$tos" ] && json_add_string tos "$tos"
+	json_add_string local "$ipaddr"
+	json_add_string remote "$peeraddr"
+	[ -n "$tunlink" ] && json_add_string link "$tunlink"
+	json_add_boolean df "${df:-1}"
+
+	proto_close_tunnel
+
+	proto_add_data
+	[ -n "$zone" ] && json_add_string zone "$zone"
+	proto_close_data
+
+	proto_send_update "$cfg"
+}
+
+proto_ipip_teardown() {
+	local cfg="$1"
+}
+
+proto_ipip_init_config() {
+	no_device=1
+	available=1
+
+	proto_config_add_int "mtu"
+	proto_config_add_int "ttl"
+	proto_config_add_string "tos"
+	proto_config_add_string "tunlink"
+	proto_config_add_string "zone"
+	proto_config_add_string "ipaddr"
+	proto_config_add_string "peeraddr"
+	proto_config_add_boolean "df"
+}
+
+[ -n "$INCLUDE_ONLY" ] || {
+	add_protocol ipip
+}