package/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 set_6to4_radvd_interface() {
  33         local cfgid="$1"
  34         local lanif="${2:-lan}"
  35         local ifmtu="${3:-1280}"
  36         local ifsection=""
  37
  38         find_ifsection() {
  39                 local net
  40                 local cfg="$1"
  41                 config_get net "$cfg" interface
  42
  43                 [ "$net" = "$lanif" ] && {
  44                         ifsection="$cfg"
  45                         return 1
  46                 }
  47         }
  48
  49         config_foreach find_ifsection interface
  50
  51         [ -z "$ifsection" ] && {
  52                 ifsection="iface_$sid"
  53                 uci_set_state radvd "$ifsection" "" interface
  54                 uci_set_state radvd "$ifsection" interface "$lanif"
  55         }
  56
  57         uci_set_state radvd "$ifsection" ignore            0
  58         uci_set_state radvd "$ifsection" IgnoreIfMissing   1
  59         uci_set_state radvd "$ifsection" AdvSendAdvert     1
  60         uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
  61         uci_set_state radvd "$ifsection" AdvLinkMTU        "$ifmtu"
  62 }
  63
  64 set_6to4_radvd_prefix() {
  65         local cfgid="$1"
  66         local lanif="${2:-lan}"
  67         local wanif="${3:-wan}"
  68         local prefix="${4:-0:0:0:1::/64}"
  69         local vlt="${5:-300}"
  70         local plt="${6:-120}"
  71         local pfxsection=""
  72
  73         find_pfxsection() {
  74                 local net base
  75                 local cfg="$1"
  76                 config_get net  "$cfg" interface
  77                 config_get base "$cfg" Base6to4Interface
  78
  79                 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
  80                         pfxsection="$cfg"
  81                         return 1
  82                 }
  83         }
  84
  85         config_foreach find_pfxsection prefix
  86
  87         [ -z "$pfxsection" ] && {
  88                 pfxsection="prefix_${sid}_${lanif}"
  89                 uci_set_state radvd "$pfxsection" ""                   prefix
  90                 uci_set_state radvd "$pfxsection" ignore               0
  91                 uci_set_state radvd "$pfxsection" interface            "$lanif"
  92                 uci_set_state radvd "$pfxsection" prefix               "$prefix"
  93                 uci_set_state radvd "$pfxsection" AdvOnLink            1
  94                 uci_set_state radvd "$pfxsection" AdvAutonomous        1
  95                 uci_set_state radvd "$pfxsection" AdvValidLifetime     "$vlt"
  96                 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
  97                 uci_set_state radvd "$pfxsection" Base6to4Interface    "$wanif"
  98         }
  99 }
 100
 101 tun_error() {
 102         local cfg="$1"; shift;
 103
 104         [ -n "$1" ] && proto_notify_error "$cfg" "$@"
 105         proto_block_restart "$cfg"
 106 }
 107
 108 proto_6to4_setup() {
 109         local cfg="$1"
 110         local iface="$2"
 111         local link="6to4-$cfg"
 112
 113         local mtu ttl ipaddr adv_subnet adv_interface adv_valid_lifetime adv_preferred_lifetime
 114         json_get_vars mtu ttl ipaddr adv_subnet adv_interface adv_valid_lifetime adv_preferred_lifetime
 115
 116         [ -z "$ipaddr" ] && {
 117                 local wanif
 118                 if ! network_find_wan wanif || ! network_get_ipaddr ipaddr "$wanif"; then
 119                         tun_error "$cfg" "NO_WAN_LINK"
 120                         return
 121                 fi
 122         }
 123
 124         test_6to4_rfc1918 "$ipaddr" && {
 125                 tun_error "$cfg" "INVALID_LOCAL_ADDRESS"
 126                 return
 127         }
 128
 129         # find our local prefix
 130         local prefix6=$(find_6to4_prefix "$ipaddr")
 131         local local6="$prefix6::1"
 132
 133         proto_init_update "$link" 1
 134         proto_add_ipv6_address "$local6" 16
 135         proto_add_ipv6_route "::" 0 "::192.88.99.1"
 136
 137         proto_add_tunnel
 138         json_add_string mode sit
 139         json_add_int mtu "${mtu:-1280}"
 140         json_add_int ttl "${ttl:-64}"
 141         json_add_string local "$ipaddr"
 142         proto_close_tunnel
 143
 144         proto_send_update "$cfg"
 145
 146         [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
 147                 local sid="6to4_$cfg"
 148
 149                 uci_revert_state radvd
 150                 config_load radvd
 151                 config_load network
 152
 153                 adv_subnet=$((0x${adv_subnet:-1}))
 154
 155                 local adv_subnets=""
 156
 157                 for adv_interface in ${adv_interface:-lan}; do
 158                         local adv_ifname
 159                         config_get adv_ifname "${adv_interface:-lan}" ifname
 160
 161                         grep -qs "^ *$adv_ifname:" /proc/net/dev && {
 162                                 local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
 163
 164                                 logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
 165                                 ip -6 addr add $subnet6 dev $adv_ifname
 166
 167                                 set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
 168                                 set_6to4_radvd_prefix    "$sid" "$adv_interface" \
 169                                         "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
 170                                         "$adv_valid_lifetime" "$adv_preferred_lifetime"
 171
 172                                 adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
 173                                 adv_subnet=$(($adv_subnet + 1))
 174                         }
 175                 done
 176
 177                 uci_set_state network "$cfg" adv_subnets "$adv_subnets"
 178
 179                 /etc/init.d/radvd restart
 180         }
 181 }
 182
 183 proto_6to4_teardown() {
 184         local cfg="$1"
 185         local link="6to4-$cfg"
 186
 187         local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
 188
 189         grep -qs "^ *$link:" /proc/net/dev && {
 190                 [ -n "$adv_subnets" ] && {
 191                         uci_revert_state radvd
 192                         /etc/init.d/radvd enabled && /etc/init.d/radvd restart
 193                 }
 194         }
 195 }
 196
 197 proto_6to4_init_config() {
 198         no_device=1
 199         available=1
 200
 201         proto_config_add_string "ipaddr"
 202         proto_config_add_int "mtu"
 203         proto_config_add_int "ttl"
 204         proto_config_add_string "adv_interface"
 205         proto_config_add_string "adv_subnet"
 206         proto_config_add_int "adv_valid_lifetime"
 207         proto_config_add_int "adv_preferred_lifetime"
 208 }
 209
 210 [ -n "$INCLUDE_ONLY" ] || {
 211         add_protocol 6to4
 212 }