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 "$INCLUDE_ONLY" ] || {
   6         . /lib/functions.sh
   7         . ../netifd-proto.sh
   8         init_proto "$@"
   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 tun_error() {
  22         local cfg="$1"; shift;
  23
  24         [ -n "$1" ] && proto_notify_error "$cfg" "$@"
  25         proto_block_restart "$cfg"
  26 }
  27
  28 proto_6in4_setup() {
  29         local cfg="$1"
  30         local iface="$2"
  31         local link="6in4-$cfg"
  32
  33         json_get_var mtu mtu
  34         json_get_var ttl ttl
  35         json_get_var local4 ipaddr
  36         json_get_var remote4 peeraddr
  37         json_get_var ip6addr ip6addr
  38         json_get_var tunnelid tunnelid
  39         json_get_var username username
  40         json_get_var password password
  41
  42         [ -z "$ip6addr" -o -z "$remote4" ] && {
  43                 tun_error "$cfg" "MISSING_ADDRESS"
  44                 return
  45         }
  46
  47         [ -z "$local4" ] && {
  48                 local wanif=$(find_6in4_wanif)
  49                 [ -z "$wanif" ] && {
  50                         tun_error "$cfg" "NO_WAN_LINK"
  51                         return
  52                 }
  53
  54                 . /lib/network/config.sh
  55                 local wancfg="$(find_config "$wanif")"
  56                 [ -z "$wancfg" ] && {
  57                         tun_error "$cfg" "NO_WAN_LINK"
  58                         return
  59                 }
  60
  61                 # If local4 is unset, guess local IPv4 address from the
  62                 # interface used by the default route.
  63                 [ -n "$wanif" ] && local4=$(find_6in4_wanip "$wanif")
  64
  65                 [ -z "$local4" ] && {
  66                         tun_error "$cfg" "NO_WAN_LINK"
  67                         return
  68                 }
  69         }
  70
  71         local local6="${ip6addr%%/*}"
  72         local mask6="${ip6addr##*/}"
  73         [[ "$local6" = "$mask6" ]] && mask6=
  74
  75         proto_init_update "$link" 1
  76         proto_add_ipv6_address "$local6" "$mask6"
  77         proto_add_ipv6_route "::" 0
  78
  79         proto_add_tunnel
  80         json_add_string mode sit
  81         json_add_int mtu "${mtu:-1280}"
  82         json_add_int ttl "${ttl:-64}"
  83         json_add_string local "$local4"
  84         json_add_string remote "$remote4"
  85         proto_close_tunnel
  86
  87         proto_send_update "$cfg"
  88
  89         [ -n "$tunnelid" -a -n "$username" -a -n "$password" ] && {
  90                 [ "${#password}" == 32 -a -z "${password//[a-fA-F0-9]/}" ] || {
  91                         password="$(echo -n "$password" | md5sum)"; password="${password%% *}"
  92                 }
  93
  94                 local url="http://ipv4.tunnelbroker.net/ipv4_end.php?ip=AUTO&apikey=$username&pass=$password&tid=$tunnelid"
  95                 local try=0
  96                 local max=3
  97
  98                 while [ $((++try)) -le $max ]; do
  99                         wget -qO/dev/null "$url" 2>/dev/null && break
 100                         sleep 1
 101                 done
 102         }
 103 }
 104
 105 proto_6in4_teardown() {
 106         local cfg="$1"
 107 }
 108
 109 proto_6in4_init_config() {
 110         no_device=1
 111         available=1
 112
 113         proto_config_add_string "ipaddr"
 114         proto_config_add_string "ip6addr"
 115         proto_config_add_string "peeraddr"
 116         proto_config_add_string "tunnelid"
 117         proto_config_add_string "username"
 118         proto_config_add_string "password"
 119         proto_config_add_int "mtu"
 120         proto_config_add_int "ttl"
 121 }
 122
 123 [ -n "$INCLUDE_ONLY" ] || {
 124         add_protocol 6in4
 125 }