package/6in4/files/6in4.sh

   1 #!/bin/sh
   2 # 6in4.sh - IPv6-in-IPv4 tunnel backend
   3 # Copyright (c) 2010 OpenWrt.org
   4
   5 [ -n "$INCLUDE_ONLY" ] || {
   6         . /etc/functions.sh
   7         . ../netifd-proto.sh
   8         init_proto "$@"
   9 }
  10
  11 find_6in4_wanif() {
  12         local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
  13         [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
  14 }
  15
  16 find_6in4_wanip() {
  17         local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
  18         echo "${ip%%[^0-9.]*}"
  19 }
  20
  21 # Hook into scan_interfaces() to synthesize a .device option
  22 # This is needed for /sbin/ifup to properly dispatch control
  23 # to setup_interface_6in4() even if no .ifname is set in
  24 # the configuration.
  25 scan_6in4() {
  26         config_set "$1" device "6in4-$1"
  27 }
  28
  29 coldplug_interface_6in4() {
  30         setup_interface_6in4 "6in4-$1" "$1"
  31 }
  32
  33
  34 tun_error() {
  35         local cfg="$1"; shift;
  36
  37         [ -n "$1" ] && proto_notify_error "$cfg" "$@"
  38         proto_block_restart "$cfg"
  39 }
  40
  41 proto_6in4_setup() {
  42         local cfg="$1"
  43         local iface="$2"
  44         local link="6in4-$cfg"
  45
  46         json_get_var mtu mtu
  47         json_get_var ttl ttl
  48         json_get_var local4 ipaddr
  49         json_get_var remote4 peeraddr
  50         json_get_var ip6addr ip6addr
  51         json_get_var tunnelid tunnelid
  52         json_get_var username username
  53         json_get_var password password
  54
  55         [ -z "$ip6addr" -o -z "$remote4" ] && {
  56                 tun_error "$cfg" "MISSING_ADDRESS"
  57                 return
  58         }
  59
  60         [ -z "$local4" ] && {
  61                 local wanif=$(find_6in4_wanif)
  62                 [ -z "$wanif" ] && {
  63                         tun_error "$cfg" "NO_WAN_LINK"
  64                         return
  65                 }
  66
  67                 . /lib/network/config.sh
  68                 local wancfg="$(find_config "$wanif")"
  69                 [ -z "$wancfg" ] && {
  70                         tun_error "$cfg" "NO_WAN_LINK"
  71                         return
  72                 }
  73
  74                 # If local4 is unset, guess local IPv4 address from the
  75                 # interface used by the default route.
  76                 [ -n "$wanif" ] && local4=$(find_6in4_wanip "$wanif")
  77
  78                 [ -z "$local4" ] && {
  79                         tun_error "$cfg" "NO_WAN_LINK"
  80                         return
  81                 }
  82         }
  83
  84         local local6="${ip6addr%%/*}"
  85         local mask6="${ip6addr##*/}"
  86         [[ "$local6" = "$mask6" ]] && mask6=
  87
  88         proto_init_update "$link" 1
  89         proto_add_ipv6_address "$local6" "$mask6"
  90         proto_add_ipv6_route "::" 0
  91
  92         proto_add_tunnel
  93         json_add_string mode sit
  94         json_add_int mtu "${mtu:-1280}"
  95         json_add_int ttl "${ttl:-64}"
  96         json_add_string local "$local4"
  97         json_add_string remote "$remote4"
  98         proto_close_tunnel
  99
 100         proto_send_update "$cfg"
 101
 102         [ -n "$tunnelid" -a -n "$username" -a -n "$password" ] && {
 103                 [ "${#password}" == 32 -a -z "${password//[a-fA-F0-9]/}" ] || {
 104                         password="$(echo -n "$password" | md5sum)"; password="${password%% *}"
 105                 }
 106
 107                 local url="http://ipv4.tunnelbroker.net/ipv4_end.php?ip=AUTO&apikey=$username&pass=$password&tid=$tunnelid"
 108                 local try=0
 109                 local max=3
 110
 111                 while [ $((++try)) -le $max ]; do
 112                         wget -qO/dev/null "$url" 2>/dev/null && break
 113                         sleep 1
 114                 done
 115         }
 116 }
 117
 118 proto_6in4_teardown() {
 119         local cfg="$1"
 120 }
 121
 122 proto_6in4_init_config() {
 123         no_device=1
 124         available=1
 125
 126         proto_config_add_string "ipaddr"
 127         proto_config_add_string "ip6addr"
 128         proto_config_add_string "peeraddr"
 129         proto_config_add_string "tunnelid"
 130         proto_config_add_string "username"
 131         proto_config_add_string "password"
 132         proto_config_add_int "mtu"
 133         proto_config_add_int "ttl"
 134 }
 135
 136 [ -n "$INCLUDE_ONLY" ] || {
 137         add_protocol 6in4
 138 }