package: add ipip6 support (#11970)

Add IPIP6(RFC2473) support.

package/network/ipv6/ipip6/Makefile

@@ -0,0 +1,39 @@
+#
+# Copyright (C) 2013 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:=ipip6
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/ipip6
+  SECTION:=net
+  CATEGORY:=Network
+  DEPENDS:=@IPV6 +kmod-ip6-tunnel +resolveip
+  TITLE:=IPv4 over IPv6 (ipip6) configuration support
+  MAINTAINER:=Missing <ms@missing233.com>
+  PKGARCH:=all
+endef
+
+define Package/ipip6/description
+Provides support for IPv4 over IPv6 (ipip6) in /etc/config/network.
+endef
+
+define Build/Compile
+endef
+
+define Build/Configure
+endef
+
+define Package/ipip6/install
+	$(INSTALL_DIR) $(1)/lib/netifd/proto
+	$(INSTALL_BIN) ./files/ipip6.sh $(1)/lib/netifd/proto/ipip6.sh
+endef
+
+$(eval $(call BuildPackage,ipip6))

package/network/ipv6/ipip6/files/ipip6.sh

@@ -0,0 +1,105 @@
+#!/bin/sh
+# ipip6.sh - ipip6 tunnel backend
+# Copyright (c) 2013 OpenWrt.org
+
+[ -n "$INCLUDE_ONLY" ] || {
+	. /lib/functions.sh
+	. /lib/functions/network.sh
+	. ../netifd-proto.sh
+	init_proto "$@"
+}
+
+proto_ipip6_setup() {
+	local cfg="$1"
+	local iface="$2"
+	local link="ipip6-$cfg"
+	local remoteip6
+
+	local mtu ttl peeraddr ip6addr tunlink zone weakif encaplimit ip4ifaddr
+	json_get_vars mtu ttl peeraddr ip6addr tunlink zone weakif encaplimit ip4ifaddr
+
+	[ -z "$peeraddr" ] && {
+		proto_notify_error "$cfg" "MISSING_ADDRESS"
+		proto_block_restart "$cfg"
+		return
+	}
+
+	( proto_add_host_dependency "$cfg" "::" "$tunlink" )
+
+	remoteip6=$(resolveip -6 "$peeraddr")
+	if [ -z "$remoteip6" ]; then
+		sleep 3
+		remoteip6=$(resolveip -6 "$peeraddr")
+		if [ -z "$remoteip6" ]; then
+			proto_notify_error "$cfg" "AFTR_DNS_FAIL"
+			return
+		fi
+	fi
+
+	for ip6 in $remoteip6; do
+		peeraddr=$ip6
+		break
+	done
+
+	[ -z "$ip6addr" ] && {
+		local wanif="$tunlink"
+		if [ -z "$wanif" ] && ! network_find_wan6 wanif; then
+			proto_notify_error "$cfg" "NO_WAN_LINK"
+			return
+		fi
+
+		if ! network_get_ipaddr6 ip6addr "$wanif"; then
+			[ -z "$weakif" ] && weakif="lan"
+			if ! network_get_ipaddr6 ip6addr "$weakif"; then
+				proto_notify_error "$cfg" "NO_WAN_LINK"
+				return
+			fi
+		fi
+	}
+
+	proto_init_update "$link" 1
+	proto_add_ipv4_route "0.0.0.0" 0
+	proto_add_ipv4_address "$ip4ifaddr" "" "" "0.0.0.0"
+
+	proto_add_tunnel
+	json_add_string mode ipip6
+	json_add_int mtu "${mtu:-1280}"
+	json_add_int ttl "${ttl:-64}"
+	json_add_string local "$ip6addr"
+	json_add_string remote "$peeraddr"
+	[ -n "$tunlink" ] && json_add_string link "$tunlink"
+	json_add_object "data"
+	  [ -n "$encaplimit" ] && json_add_string encaplimit "$encaplimit"
+	json_close_object
+	proto_close_tunnel
+
+	proto_add_data
+	[ -n "$zone" ] && json_add_string zone "$zone"
+
+	proto_close_data
+
+	proto_send_update "$cfg"
+}
+
+proto_ipip6_teardown() {
+	local cfg="$1"
+}
+
+proto_ipip6_init_config() {
+	no_device=1
+	available=1
+
+	proto_config_add_string "ip6addr"
+	proto_config_add_string "peeraddr"
+	proto_config_add_string "tunlink"
+	proto_config_add_int "mtu"
+	proto_config_add_int "ttl"
+	proto_config_add_string "encaplimit"
+	proto_config_add_string "zone"
+	proto_config_add_string "weakif"
+	proto_config_add_string "ip4ifaddr"
+}
+
+[ -n "$INCLUDE_ONLY" ] || {
+	add_protocol ipip6
+}