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

   1 #!/bin/sh
   2 # 6rd.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 proto_6rd_setup() {
  13         local cfg="$1"
  14         local iface="$2"
  15         local link="6rd-$cfg"
  16
  17         local mtu ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen tunlink
  18         json_get_vars mtu ttl ipaddr peeraddr ip6prefix ip6prefixlen ip4prefixlen tunlink
  19
  20         [ -z "$ip6prefix" -o -z "$peeraddr" ] && {
  21                 proto_notify_error "$cfg" "MISSING_ADDRESS"
  22                 proto_block_restart "$cfg"
  23                 return
  24         }
  25
  26         ( proto_add_host_dependency "$cfg" 0.0.0.0 )
  27
  28         [ -z "$ipaddr" ] && {
  29                 local wanif
  30                 if ! network_find_wan wanif || ! network_get_ipaddr ipaddr "$wanif"; then
  31                         proto_notify_error "$cfg" "NO_WAN_LINK"
  32                         return
  33                 fi
  34         }
  35
  36         # Determine the relay prefix.
  37         local ip4prefixlen="${ip4prefixlen:-0}"
  38         local ip4prefix=$(ipcalc.sh "$ipaddr/$ip4prefixlen" | grep NETWORK)
  39         ip4prefix="${ip4prefix#NETWORK=}"
  40
  41         # Determine our IPv6 address.
  42         local ip6subnet=$(6rdcalc "$ip6prefix/$ip6prefixlen" "$ipaddr/$ip4prefixlen")
  43         local ip6addr="${ip6subnet%%::*}::1"
  44
  45         # Determine the IPv6 prefix
  46         local ip6lanprefix="$ip6subnet/$(($ip6prefixlen + 32 - $ip4prefixlen))"
  47
  48         proto_init_update "$link" 1
  49         proto_add_ipv6_address "$ip6addr" "$ip6prefixlen"
  50         proto_add_ipv6_prefix "$ip6lanprefix"
  51         proto_add_ipv6_route "::" 0 "::$peeraddr" 4096
  52
  53         proto_add_tunnel
  54         json_add_string mode sit
  55         json_add_int mtu "${mtu:-1280}"
  56         json_add_int ttl "${ttl:-64}"
  57         json_add_string local "$ipaddr"
  58         json_add_string 6rd-prefix "$ip6prefix/$ip6prefixlen"
  59         json_add_string 6rd-relay-prefix "$ip4prefix/$ip4prefixlen"
  60         [ -n "$tunlink" ] && json_add_string link "$tunlink"
  61         proto_close_tunnel
  62
  63         proto_send_update "$cfg"
  64 }
  65
  66 proto_6rd_teardown() {
  67         local cfg="$1"
  68 }
  69
  70 proto_6rd_init_config() {
  71         no_device=1
  72         available=1
  73
  74         proto_config_add_int "mtu"
  75         proto_config_add_int "ttl"
  76         proto_config_add_string "ipaddr"
  77         proto_config_add_string "peeraddr"
  78         proto_config_add_string "ip6prefix"
  79         proto_config_add_string "ip6prefixlen"
  80         proto_config_add_string "ip4prefixlen"
  81         proto_config_add_string "tunlink"
  82 }
  83
  84 [ -n "$INCLUDE_ONLY" ] || {
  85         add_protocol 6rd
  86 }