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 "$INCLUDE_ONLY" ] || {
   6         . /etc/functions.sh
   7         . ../netifd-proto.sh
   8         init_proto "$@"
   9 }
  10
  11 find_6to4_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_6to4_wanip() {
  17         local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
  18         echo "${ip%%[^0-9.]*}"
  19 }
  20
  21 find_6to4_prefix() {
  22         local ip4="$1"
  23         local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS"
  24
  25         printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
  26 }
  27
  28 test_6to4_rfc1918()
  29 {
  30         local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
  31         [ $1 -eq  10 ] && return 0
  32         [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
  33         [ $1 -eq 172 ] && [ $2 -ge  16 ] && [ $2 -le  31 ] && return 0
  34         return 1
  35 }
  36
  37 set_6to4_radvd_interface() {
  38         local cfgid="$1"
  39         local lanif="${2:-lan}"
  40         local ifmtu="${3:-1280}"
  41         local ifsection=""
  42
  43         find_ifsection() {
  44                 local net
  45                 local cfg="$1"
  46                 config_get net "$cfg" interface
  47
  48                 [ "$net" = "$lanif" ] && {
  49                         ifsection="$cfg"
  50                         return 1
  51                 }
  52         }
  53
  54         config_foreach find_ifsection interface
  55
  56         [ -z "$ifsection" ] && {
  57                 ifsection="iface_$sid"
  58                 uci_set_state radvd "$ifsection" "" interface
  59                 uci_set_state radvd "$ifsection" interface "$lanif"
  60         }
  61
  62         uci_set_state radvd "$ifsection" ignore            0
  63         uci_set_state radvd "$ifsection" IgnoreIfMissing   1
  64         uci_set_state radvd "$ifsection" AdvSendAdvert     1
  65         uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
  66         uci_set_state radvd "$ifsection" AdvLinkMTU        "$ifmtu"
  67 }
  68
  69 set_6to4_radvd_prefix() {
  70         local cfgid="$1"
  71         local lanif="${2:-lan}"
  72         local wanif="${3:-wan}"
  73         local prefix="${4:-0:0:0:1::/64}"
  74         local vlt="${5:-300}"
  75         local plt="${6:-120}"
  76         local pfxsection=""
  77
  78         find_pfxsection() {
  79                 local net base
  80                 local cfg="$1"
  81                 config_get net  "$cfg" interface
  82                 config_get base "$cfg" Base6to4Interface
  83
  84                 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
  85                         pfxsection="$cfg"
  86                         return 1
  87                 }
  88         }
  89
  90         config_foreach find_pfxsection prefix
  91
  92         [ -z "$pfxsection" ] && {
  93                 pfxsection="prefix_${sid}_${lanif}"
  94                 uci_set_state radvd "$pfxsection" ""                   prefix
  95                 uci_set_state radvd "$pfxsection" ignore               0
  96                 uci_set_state radvd "$pfxsection" interface            "$lanif"
  97                 uci_set_state radvd "$pfxsection" prefix               "$prefix"
  98                 uci_set_state radvd "$pfxsection" AdvOnLink            1
  99                 uci_set_state radvd "$pfxsection" AdvAutonomous        1
 100                 uci_set_state radvd "$pfxsection" AdvValidLifetime     "$vlt"
 101                 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
 102                 uci_set_state radvd "$pfxsection" Base6to4Interface    "$wanif"
 103         }
 104 }
 105
 106 tun_error() {
 107         local cfg="$1"; shift;
 108
 109         [ -n "$1" ] && proto_notify_error "$cfg" "$@"
 110         proto_block_restart "$cfg"
 111 }
 112
 113 proto_6to4_setup() {
 114         local cfg="$1"
 115         local iface="$2"
 116         local link="6to4-$cfg"
 117
 118         json_get_var mtu mtu
 119         json_get_var ttl ttl
 120         json_get_var local4 ipaddr
 121
 122         json_get_var adv_subnet adv_subnet
 123         json_get_var adv_interface adv_interface
 124         json_get_var adv_valid_lifetime adv_valid_lifetime
 125         json_get_var adv_preferred_lifetime adv_preferred_lifetime
 126
 127         local wanif=$(find_6to4_wanif)
 128         [ -z "$wanif" ] && {
 129                 tun_error "$cfg" "NO_WAN_LINK"
 130                 return
 131         }
 132
 133         . /lib/network/config.sh
 134         local wancfg="$(find_config "$wanif")"
 135         [ -z "$wancfg" ] && {
 136                 tun_error "$cfg" "NO_WAN_LINK"
 137                 return
 138         }
 139
 140         # If local4 is unset, guess local IPv4 address from the
 141         # interface used by the default route.
 142         [ -z "$local4" ] && {
 143                 [ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif")
 144         }
 145
 146         [ -z "$local4" ] && {
 147                 tun_error "$cfg" "NO_WAN_LINK"
 148                 return
 149         }
 150
 151         test_6to4_rfc1918 "$local4" && {
 152                 tun_error "$cfg" "INVALID_LOCAL_ADDRESS"
 153                 return
 154         }
 155
 156         # find our local prefix
 157         local prefix6=$(find_6to4_prefix "$local4")
 158         local local6="$prefix6::1"
 159
 160         proto_init_update "$link" 1
 161         proto_add_ipv6_address "$local6" 16
 162         proto_add_ipv6_route "::" 0 "::192.88.99.1"
 163
 164         proto_add_tunnel
 165         json_add_string mode sit
 166         json_add_int mtu "${mtu:-1280}"
 167         json_add_int ttl "${ttl:-64}"
 168         json_add_string local "$local4"
 169         proto_close_tunnel
 170
 171         proto_send_update "$cfg"
 172
 173         [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
 174                 local sid="6to4_$cfg"
 175
 176                 uci_revert_state radvd
 177                 config_load radvd
 178
 179                 adv_subnet=$((0x${adv_subnet:-1}))
 180
 181                 local adv_subnets=""
 182
 183                 for adv_interface in ${adv_interface:-lan}; do
 184                         local adv_ifname
 185                         config_get adv_ifname "${adv_interface:-lan}" ifname
 186
 187                         grep -qs "^ *$adv_ifname:" /proc/net/dev && {
 188                                 local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
 189
 190                                 logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
 191                                 ip -6 addr add $subnet6 dev $adv_ifname
 192
 193                                 set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
 194                                 set_6to4_radvd_prefix    "$sid" "$adv_interface" \
 195                                         "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
 196                                         "$adv_valid_lifetime" "$adv_preferred_lifetime"
 197
 198                                 adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
 199                                 adv_subnet=$(($adv_subnet + 1))
 200                         }
 201                 done
 202
 203                 uci_set_state network "$cfg" adv_subnets "$adv_subnets"
 204
 205                 /etc/init.d/radvd restart
 206         }
 207 }
 208
 209 proto_6to4_teardown() {
 210         local cfg="$1"
 211         local link="6to4-$cfg"
 212
 213         local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
 214
 215         grep -qs "^ *$link:" /proc/net/dev && {
 216                 [ -n "$adv_subnets" ] && {
 217                         uci_revert_state radvd
 218                         /etc/init.d/radvd enabled && /etc/init.d/radvd restart
 219                 }
 220         }
 221 }
 222
 223 proto_6to4_init_config() {
 224         no_device=1
 225         available=1
 226
 227         proto_config_add_string "ipaddr"
 228         proto_config_add_int "mtu"
 229         proto_config_add_int "ttl"
 230         proto_config_add_string "adv_interface"
 231         proto_config_add_string "adv_subnet"
 232         proto_config_add_int "adv_valid_lifetime"
 233         proto_config_add_int "adv_preferred_lifetime"
 234 }
 235
 236 [ -n "$INCLUDE_ONLY" ] || {
 237         add_protocol 6to4
 238 }