package/network/ipv6/6to4/files/6to4.sh

   1 #!/bin/sh
   2 # 6to4.sh - IPv6-in-IPv4 tunnel backend
   3 # Copyright (c) 2010-2012 OpenWrt.org
   4
   5 [ -n "$INCLUDE_ONLY" ] || {
   6         . /lib/functions.sh
   7         . /lib/functions/network.sh
   8         . ../netifd-proto.sh
   9         init_proto "$@"
  10 }
  11
  12 find_6to4_prefix() {
  13         local ip4="$1"
  14         local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS"
  15
  16         printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
  17 }
  18
  19 test_6to4_rfc1918()
  20 {
  21         local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
  22         [ $1 -eq  10 ] && return 0
  23         [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
  24         [ $1 -eq 172 ] && [ $2 -ge  16 ] && [ $2 -le  31 ] && return 0
  25
  26         # RFC 6598
  27         [ $1 -eq 100 ] && [ $2 -ge  64 ] && [ $2 -le 127 ] && return 0
  28
  29         return 1
  30 }
  31
  32 proto_6to4_setup() {
  33         local cfg="$1"
  34         local iface="$2"
  35         local link="6to4-$cfg"
  36
  37         local mtu ttl ipaddr sourcerouting
  38         json_get_vars mtu ttl ipaddr sourcerouting
  39
  40         ( proto_add_host_dependency "$cfg" 0.0.0.0 )
  41
  42         local wanif
  43         if ! network_find_wan wanif; then
  44                 proto_notify_error "$cfg" "NO_WAN_LINK"
  45                 return
  46         fi
  47
  48         [ -z "$ipaddr" ] && {
  49                 if ! network_get_ipaddr ipaddr "$wanif"; then
  50                         proto_notify_error "$cfg" "NO_WAN_ADDRESS"
  51                         return
  52                 fi
  53         }
  54
  55         test_6to4_rfc1918 "$ipaddr" && {
  56                 proto_notify_error "$cfg" "INVALID_LOCAL_ADDRESS"
  57                 return
  58         }
  59
  60         # find our local prefix
  61         local prefix6=$(find_6to4_prefix "$ipaddr")
  62         local local6="$prefix6::1"
  63
  64         proto_init_update "$link" 1
  65         proto_add_ipv6_address "$local6" 16
  66         proto_add_ipv6_prefix "$prefix6::/48"
  67
  68         if [ "$sourcerouting" != "0" ]; then
  69                 proto_add_ipv6_route "::" 0 "::192.88.99.1" "" "" "::/128"
  70                 proto_add_ipv6_route "::" 0 "::192.88.99.1" "" "" "$local6/16"
  71                 proto_add_ipv6_route "::" 0 "::192.88.99.1" "" "" "$prefix6::/48"
  72         else
  73                 proto_add_ipv6_route "::" 0 "::192.88.99.1"
  74         fi
  75
  76         proto_add_tunnel
  77         json_add_string mode sit
  78         json_add_int mtu "${mtu:-1280}"
  79         json_add_int ttl "${ttl:-64}"
  80         json_add_string local "$ipaddr"
  81         proto_close_tunnel
  82
  83         proto_send_update "$cfg"
  84 }
  85
  86 proto_6to4_teardown() {
  87         local cfg="$1"
  88 }
  89
  90 proto_6to4_init_config() {
  91         no_device=1
  92         available=1
  93
  94         proto_config_add_string "ipaddr"
  95         proto_config_add_int "mtu"
  96         proto_config_add_int "ttl"
  97         proto_config_add_boolean "sourcerouting"
  98 }
  99
 100 [ -n "$INCLUDE_ONLY" ] || {
 101         add_protocol 6to4
 102 }