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
  35         # RFC 6598
  36         [ $1 -eq 100 ] && [ $2 -ge  64 ] && [ $2 -le 127 ] && return 0
  37
  38         return 1
  39 }
  40
  41 set_6to4_radvd_interface() {
  42         local cfgid="$1"
  43         local lanif="${2:-lan}"
  44         local ifmtu="${3:-1280}"
  45         local ifsection=""
  46
  47         find_ifsection() {
  48                 local net
  49                 local cfg="$1"
  50                 config_get net "$cfg" interface
  51
  52                 [ "$net" = "$lanif" ] && {
  53                         ifsection="$cfg"
  54                         return 1
  55                 }
  56         }
  57
  58         config_foreach find_ifsection interface
  59
  60         [ -z "$ifsection" ] && {
  61                 ifsection="iface_$sid"
  62                 uci_set_state radvd "$ifsection" "" interface
  63                 uci_set_state radvd "$ifsection" interface "$lanif"
  64         }
  65
  66         uci_set_state radvd "$ifsection" ignore            0
  67         uci_set_state radvd "$ifsection" IgnoreIfMissing   1
  68         uci_set_state radvd "$ifsection" AdvSendAdvert     1
  69         uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
  70         uci_set_state radvd "$ifsection" AdvLinkMTU        "$ifmtu"
  71 }
  72
  73 set_6to4_radvd_prefix() {
  74         local cfgid="$1"
  75         local lanif="${2:-lan}"
  76         local wanif="${3:-wan}"
  77         local prefix="${4:-0:0:0:1::/64}"
  78         local vlt="${5:-300}"
  79         local plt="${6:-120}"
  80         local pfxsection=""
  81
  82         find_pfxsection() {
  83                 local net base
  84                 local cfg="$1"
  85                 config_get net  "$cfg" interface
  86                 config_get base "$cfg" Base6to4Interface
  87
  88                 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
  89                         pfxsection="$cfg"
  90                         return 1
  91                 }
  92         }
  93
  94         config_foreach find_pfxsection prefix
  95
  96         [ -z "$pfxsection" ] && {
  97                 pfxsection="prefix_${sid}_${lanif}"
  98                 uci_set_state radvd "$pfxsection" ""                   prefix
  99                 uci_set_state radvd "$pfxsection" ignore               0
 100                 uci_set_state radvd "$pfxsection" interface            "$lanif"
 101                 uci_set_state radvd "$pfxsection" prefix               "$prefix"
 102                 uci_set_state radvd "$pfxsection" AdvOnLink            1
 103                 uci_set_state radvd "$pfxsection" AdvAutonomous        1
 104                 uci_set_state radvd "$pfxsection" AdvValidLifetime     "$vlt"
 105                 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
 106                 uci_set_state radvd "$pfxsection" Base6to4Interface    "$wanif"
 107         }
 108 }
 109
 110 tun_error() {
 111         local cfg="$1"; shift;
 112
 113         [ -n "$1" ] && proto_notify_error "$cfg" "$@"
 114         proto_block_restart "$cfg"
 115 }
 116
 117 proto_6to4_setup() {
 118         local cfg="$1"
 119         local iface="$2"
 120         local link="6to4-$cfg"
 121
 122         json_get_var mtu mtu
 123         json_get_var ttl ttl
 124         json_get_var local4 ipaddr
 125
 126         json_get_var adv_subnet adv_subnet
 127         json_get_var adv_interface adv_interface
 128         json_get_var adv_valid_lifetime adv_valid_lifetime
 129         json_get_var adv_preferred_lifetime adv_preferred_lifetime
 130
 131         local wanif=$(find_6to4_wanif)
 132         [ -z "$wanif" ] && {
 133                 tun_error "$cfg" "NO_WAN_LINK"
 134                 return
 135         }
 136
 137         . /lib/network/config.sh
 138         local wancfg="$(find_config "$wanif")"
 139         [ -z "$wancfg" ] && {
 140                 tun_error "$cfg" "NO_WAN_LINK"
 141                 return
 142         }
 143
 144         # If local4 is unset, guess local IPv4 address from the
 145         # interface used by the default route.
 146         [ -z "$local4" ] && {
 147                 [ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif")
 148         }
 149
 150         [ -z "$local4" ] && {
 151                 tun_error "$cfg" "NO_WAN_LINK"
 152                 return
 153         }
 154
 155         test_6to4_rfc1918 "$local4" && {
 156                 tun_error "$cfg" "INVALID_LOCAL_ADDRESS"
 157                 return
 158         }
 159
 160         # find our local prefix
 161         local prefix6=$(find_6to4_prefix "$local4")
 162         local local6="$prefix6::1"
 163
 164         proto_init_update "$link" 1
 165         proto_add_ipv6_address "$local6" 16
 166         proto_add_ipv6_route "::" 0 "::192.88.99.1"
 167
 168         proto_add_tunnel
 169         json_add_string mode sit
 170         json_add_int mtu "${mtu:-1280}"
 171         json_add_int ttl "${ttl:-64}"
 172         json_add_string local "$local4"
 173         proto_close_tunnel
 174
 175         proto_send_update "$cfg"
 176
 177         [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
 178                 local sid="6to4_$cfg"
 179
 180                 uci_revert_state radvd
 181                 config_load radvd
 182                 config_load network
 183
 184                 adv_subnet=$((0x${adv_subnet:-1}))
 185
 186                 local adv_subnets=""
 187
 188                 for adv_interface in ${adv_interface:-lan}; do
 189                         local adv_ifname
 190                         config_get adv_ifname "${adv_interface:-lan}" ifname
 191
 192                         grep -qs "^ *$adv_ifname:" /proc/net/dev && {
 193                                 local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
 194
 195                                 logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
 196                                 ip -6 addr add $subnet6 dev $adv_ifname
 197
 198                                 set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
 199                                 set_6to4_radvd_prefix    "$sid" "$adv_interface" \
 200                                         "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
 201                                         "$adv_valid_lifetime" "$adv_preferred_lifetime"
 202
 203                                 adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
 204                                 adv_subnet=$(($adv_subnet + 1))
 205                         }
 206                 done
 207
 208                 uci_set_state network "$cfg" adv_subnets "$adv_subnets"
 209
 210                 /etc/init.d/radvd restart
 211         }
 212 }
 213
 214 proto_6to4_teardown() {
 215         local cfg="$1"
 216         local link="6to4-$cfg"
 217
 218         local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
 219
 220         grep -qs "^ *$link:" /proc/net/dev && {
 221                 [ -n "$adv_subnets" ] && {
 222                         uci_revert_state radvd
 223                         /etc/init.d/radvd enabled && /etc/init.d/radvd restart
 224                 }
 225         }
 226 }
 227
 228 proto_6to4_init_config() {
 229         no_device=1
 230         available=1
 231
 232         proto_config_add_string "ipaddr"
 233         proto_config_add_int "mtu"
 234         proto_config_add_int "ttl"
 235         proto_config_add_string "adv_interface"
 236         proto_config_add_string "adv_subnet"
 237         proto_config_add_int "adv_valid_lifetime"
 238         proto_config_add_int "adv_preferred_lifetime"
 239 }
 240
 241 [ -n "$INCLUDE_ONLY" ] || {
 242         add_protocol 6to4
 243 }