#!/bin/sh # 6in4.sh - IPv6-in-IPv4 tunnel backend # Copyright (c) 2010 OpenWrt.org [ -n "$INCLUDE_ONLY" ] || { . /etc/functions.sh . ../netifd-proto.sh init_proto "$@" } find_6in4_wanif() { local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}" [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if" } find_6in4_wanip() { local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }" echo "${ip%%[^0-9.]*}" } tun_error() { local cfg="$1"; shift; [ -n "$1" ] && proto_notify_error "$cfg" "$@" proto_block_restart "$cfg" } proto_6in4_setup() { local cfg="$1" local iface="$2" local link="6in4-$cfg" json_get_var mtu mtu json_get_var ttl ttl json_get_var local4 ipaddr json_get_var remote4 peeraddr json_get_var ip6addr ip6addr json_get_var tunnelid tunnelid json_get_var username username json_get_var password password [ -z "$ip6addr" -o -z "$remote4" ] && { tun_error "$cfg" "MISSING_ADDRESS" return } [ -z "$local4" ] && { local wanif=$(find_6in4_wanif) [ -z "$wanif" ] && { tun_error "$cfg" "NO_WAN_LINK" return } . /lib/network/config.sh local wancfg="$(find_config "$wanif")" [ -z "$wancfg" ] && { tun_error "$cfg" "NO_WAN_LINK" return } # If local4 is unset, guess local IPv4 address from the # interface used by the default route. [ -n "$wanif" ] && local4=$(find_6in4_wanip "$wanif") [ -z "$local4" ] && { tun_error "$cfg" "NO_WAN_LINK" return } } local local6="${ip6addr%%/*}" local mask6="${ip6addr##*/}" [[ "$local6" = "$mask6" ]] && mask6= proto_init_update "$link" 1 proto_add_ipv6_address "$local6" "$mask6" proto_add_ipv6_route "::" 0 proto_add_tunnel json_add_string mode sit json_add_int mtu "${mtu:-1280}" json_add_int ttl "${ttl:-64}" json_add_string local "$local4" json_add_string remote "$remote4" proto_close_tunnel proto_send_update "$cfg" [ -n "$tunnelid" -a -n "$username" -a -n "$password" ] && { [ "${#password}" == 32 -a -z "${password//[a-fA-F0-9]/}" ] || { password="$(echo -n "$password" | md5sum)"; password="${password%% *}" } local url="http://ipv4.tunnelbroker.net/ipv4_end.php?ip=AUTO&apikey=$username&pass=$password&tid=$tunnelid" local try=0 local max=3 while [ $((++try)) -le $max ]; do wget -qO/dev/null "$url" 2>/dev/null && break sleep 1 done } } proto_6in4_teardown() { local cfg="$1" } proto_6in4_init_config() { no_device=1 available=1 proto_config_add_string "ipaddr" proto_config_add_string "ip6addr" proto_config_add_string "peeraddr" proto_config_add_string "tunnelid" proto_config_add_string "username" proto_config_add_string "password" proto_config_add_int "mtu" proto_config_add_int "ttl" } [ -n "$INCLUDE_ONLY" ] || { add_protocol 6in4 }