--- /dev/null
+#
+# Copyright (C) 2010-2012 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:=6rd
+PKG_VERSION:=1
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/6rd
+ SECTION:=ipv6
+ CATEGORY:=IPv6
+ DEPENDS:=+kmod-ipv6 +kmod-sit
+ TITLE:=6rd configuration support
+ MAINTAINER:=Stéphan Kochen <stephan@kochen.nl>
+ PKGARCH:=all
+endef
+
+define Package/6rd/description
+Provides support for 6rd tunnels in /etc/config/network.
+Refer to http://wiki.openwrt.org/doc/uci/network for
+configuration details.
+endef
+
+define Build/Prepare
+ mkdir -p $(PKG_BUILD_DIR)
+ $(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Configure
+endef
+
+define Build/Compile
+ $(MAKE) -C $(PKG_BUILD_DIR) \
+ CC="$(TARGET_CC)" \
+ CFLAGS="$(TARGET_CFLAGS) -Wall" \
+ LDFLAGS="$(TARGET_LDFLAGS)"
+endef
+
+define Package/6rd/install
+ $(INSTALL_DIR) $(1)/usr/sbin
+ $(INSTALL_BIN) $(PKG_BUILD_DIR)/6rdcalc $(1)/usr/sbin/
+ $(INSTALL_DIR) $(1)/lib/netifd/proto
+ $(INSTALL_BIN) ./files/6rd.sh $(1)/lib/netifd/proto/6rd.sh
+ $(INSTALL_DIR) $(1)/etc/hotplug.d/iface
+ $(INSTALL_DATA) ./files/6rd.hotplug $(1)/etc/hotplug.d/iface/92-6rd
+endef
+
+$(eval $(call BuildPackage,6rd))
--- /dev/null
+#!/bin/sh
+# 6rd.sh - IPv6-in-IPv4 tunnel backend
+# Copyright (c) 2010-2012 OpenWrt.org
+
+[ -n "$INCLUDE_ONLY" ] || {
+ . /lib/functions.sh
+ . /lib/functions/network.sh
+ . ../netifd-proto.sh
+ init_proto "$@"
+}
+
+tun_error() {
+ local cfg="$1"; shift;
+
+ [ -n "$1" ] && proto_notify_error "$cfg" "$@"
+ proto_block_restart "$cfg"
+}
+
+proto_6rd_setup() {
+ local cfg="$1"
+ local iface="$2"
+ local link="6rd-$cfg"
+
+ local mtu ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen
+ json_get_vars mtu ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen
+
+ [ -z "$ip6prefix" -o -z "$peeraddr" ] && {
+ tun_error "$cfg" "MISSING_ADDRESS"
+ return
+ }
+
+ [ -z "$ipaddr" ] && {
+ local wanif
+ if ! network_find_wan wanif || ! network_get_ipaddr ipaddr "$wanif"; then
+ tun_error "$cfg" "NO_WAN_LINK"
+ return
+ fi
+ }
+
+ # Determine the relay prefix.
+ local ip4prefixlen="${ip4prefixlen:-0}"
+ local ip4prefix=$(ipcalc.sh "$ipaddr/$ip4prefixlen" | grep NETWORK)
+ ip4prefix="${ip4prefix#NETWORK=}"
+
+ # Determine our IPv6 address.
+ local ip6subnet=$(6rdcalc "$ip6prefix/$ip6prefixlen" "$ipaddr/$ip4prefixlen")
+ local ip6addr="${ip6subnet%%::*}::1"
+
+ proto_init_update "$link" 1
+ proto_add_ipv6_address "$ip6addr" "$ip6prefixlen"
+ proto_add_ipv6_route "::" 0 "::$peeraddr"
+
+ proto_add_tunnel
+ json_add_string mode sit
+ json_add_int mtu "${mtu:-1280}"
+ json_add_int ttl "${ttl:-64}"
+ json_add_string local "$ipaddr"
+ json_add_string 6rd-prefix "$ip6prefix/$ip6prefixlen"
+ json_add_string 6rd-relay-prefix "$ip4prefix/$ip4prefixlen"
+ proto_close_tunnel
+
+ proto_send_update "$cfg"
+}
+
+proto_6rd_teardown() {
+ local cfg="$1"
+}
+
+proto_6rd_init_config() {
+ no_device=1
+ available=1
+
+ proto_config_add_int "mtu"
+ proto_config_add_int "ttl"
+ proto_config_add_string "peeraddr"
+ proto_config_add_string "ip6prefix"
+ proto_config_add_string "ip6prefixlen"
+ proto_config_add_string "ip4prefixlen"
+}
+
+[ -n "$INCLUDE_ONLY" ] || {
+ add_protocol 6rd
+}
--- /dev/null
+/*
+ * Utility used to calculate the 6rd subnet.
+ *
+ * Copyright 2012, Stéphan Kochen <stephan@kochen.nl>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/errno.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#define INET_PREFIXSTRLEN (INET_ADDRSTRLEN+3)
+#define INET6_PREFIXSTRLEN (INET6_ADDRSTRLEN+4)
+
+static void print_usage()
+{
+ fprintf(stderr, "Usage: 6rdcalc <v6 prefix>/<mask> <v4 address>/<mask>\n");
+ exit(1);
+}
+
+static void print_error()
+{
+ fprintf(stderr, "%s", strerror(errno));
+ exit(1);
+}
+
+static void parse_str(int af, char *str, void *addr, unsigned long *mask)
+{
+ int ret;
+ char *slash;
+
+ /* Split the address at the slash. */
+ if ((slash = strchr(str, '/')) == NULL)
+ print_usage();
+ *slash = '\0';
+
+ /* Parse the address. */
+ if ((ret = inet_pton(af, str, addr)) != 1) {
+ if (ret == 0)
+ print_usage();
+ else
+ print_error();
+ }
+
+ /* Parse the mask. */
+ *mask = strtoul(slash+1, NULL, 10);
+ if ((af == AF_INET && *mask > 32) ||
+ (af == AF_INET6 && *mask > 128))
+ print_usage();
+}
+
+int main(int argc, const char **argv)
+{
+ char v6str[INET6_PREFIXSTRLEN], v4str[INET_PREFIXSTRLEN];
+ struct in6_addr v6;
+ struct in_addr v4;
+ unsigned long v6it, v4it, mask;
+ unsigned char *byte4, *byte6;
+ unsigned char bit4, bit6;
+
+ /* Check parameters. */
+ if (argc != 3)
+ print_usage();
+
+ /* Parse the v6 address. */
+ strncpy(v6str, argv[1], INET6_PREFIXSTRLEN);
+ v6str[INET6_PREFIXSTRLEN-1] = '\0';
+ parse_str(AF_INET6, v6str, &v6, &v6it);
+
+ /* Parse the v4 address */
+ strncpy(v4str, argv[2], INET_PREFIXSTRLEN);
+ v6str[INET_PREFIXSTRLEN-1] = '\0';
+ parse_str(AF_INET, v4str, &v4, &v4it);
+
+ /* Check if the combined mask is within bounds. */
+ mask = (32 - v4it) + v6it;
+ if (mask > 128)
+ print_usage();
+
+ /* Combine the addresses. */
+ while (v4it < 32) {
+ byte6 = (unsigned char *)(&v6.s6_addr) + (v6it >> 3);
+ byte4 = (unsigned char *)(&v4.s_addr) + (v4it >> 3);
+ bit6 = 128 >> (v6it & 0x07);
+ bit4 = 128 >> (v4it & 0x07);
+
+ if (*byte4 & bit4)
+ *byte6 |= bit6;
+ else
+ *byte6 &= ~bit6;
+
+ v4it++; v6it++;
+ }
+
+ /* Clear remaining bits. */
+ while (v6it < 128) {
+ byte6 = (unsigned char *)(&v6.s6_addr) + (v6it >> 2);
+ bit6 = 128 >> (v6it & 0x07);
+
+ *byte6 &= ~bit6;
+
+ v6it++;
+ }
+
+ /* Print the subnet prefix. */
+ if (inet_ntop(AF_INET6, &v6, v6str, sizeof(v6str)) == NULL)
+ print_error();
+ printf("%s/%lu\n", v6str, mask);
+ return 0;
+}
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