package/6to4/files/6to4.sh

   1 # 6to4.sh - IPv6-in-IPv4 tunnel backend
   2 # Copyright (c) 2010-2011 OpenWrt.org
   3
   4 find_6to4_wanif() {
   5         local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
   6         [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
   7 }
   8
   9 find_6to4_wanip() {
  10         local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
  11         echo "${ip%%[^0-9.]*}"
  12 }
  13
  14 find_6to4_prefix() {
  15         local ip4="$1"
  16         local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS"
  17
  18         printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
  19 }
  20
  21 test_6to4_rfc1918()
  22 {
  23         local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
  24         [ $1 -eq  10 ] && return 0
  25         [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
  26         [ $1 -eq 172 ] && [ $2 -ge  16 ] && [ $2 -le  31 ] && return 0
  27         return 1
  28 }
  29
  30 set_6to4_radvd_interface() {
  31         local cfgid="$1"
  32         local lanif="${2:-lan}"
  33         local ifmtu="${3:-1280}"
  34         local ifsection=""
  35
  36         find_ifsection() {
  37                 local net
  38                 local cfg="$1"
  39                 config_get net "$cfg" interface
  40
  41                 [ "$net" = "$lanif" ] && {
  42                         ifsection="$cfg"
  43                         return 1
  44                 }
  45         }
  46
  47         config_foreach find_ifsection interface
  48
  49         [ -z "$ifsection" ] && {
  50                 ifsection="iface_$sid"
  51                 uci_set_state radvd "$ifsection" "" interface
  52                 uci_set_state radvd "$ifsection" interface "$lanif"
  53         }
  54
  55         uci_set_state radvd "$ifsection" ignore            0
  56         uci_set_state radvd "$ifsection" IgnoreIfMissing   1
  57         uci_set_state radvd "$ifsection" AdvSendAdvert     1
  58         uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
  59         uci_set_state radvd "$ifsection" AdvLinkMTU        "$ifmtu"
  60 }
  61
  62 set_6to4_radvd_prefix() {
  63         local cfgid="$1"
  64         local lanif="${2:-lan}"
  65         local wanif="${3:-wan}"
  66         local prefix="${4:-0:0:0:1::/64}"
  67         local pfxsection=""
  68
  69         find_pfxsection() {
  70                 local net base
  71                 local cfg="$1"
  72                 config_get net  "$cfg" interface
  73                 config_get base "$cfg" Base6to4Interface
  74
  75                 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
  76                         pfxsection="$cfg"
  77                         return 1
  78                 }
  79         }
  80
  81         config_foreach find_pfxsection prefix
  82
  83         [ -z "$pfxsection" ] && {
  84                 pfxsection="prefix_${sid}_${lanif}"
  85                 uci_set_state radvd "$pfxsection" ""                   prefix
  86                 uci_set_state radvd "$pfxsection" ignore               0
  87                 uci_set_state radvd "$pfxsection" interface            "$lanif"
  88                 uci_set_state radvd "$pfxsection" prefix               "$prefix"
  89                 uci_set_state radvd "$pfxsection" AdvOnLink            1
  90                 uci_set_state radvd "$pfxsection" AdvAutonomous        1
  91                 uci_set_state radvd "$pfxsection" AdvValidLifetime     300
  92                 uci_set_state radvd "$pfxsection" AdvPreferredLifetime 120
  93                 uci_set_state radvd "$pfxsection" Base6to4Interface    "$wanif"
  94         }
  95 }
  96
  97
  98 # Hook into scan_interfaces() to synthesize a .device option
  99 # This is needed for /sbin/ifup to properly dispatch control
 100 # to setup_interface_6to4() even if no .ifname is set in
 101 # the configuration.
 102 scan_6to4() {
 103         config_set "$1" device "6to4-$1"
 104 }
 105
 106 coldplug_interface_6to4() {
 107         setup_interface_6to4 "6to4-$1" "$1"
 108 }
 109
 110 setup_interface_6to4() {
 111         local iface="$1"
 112         local cfg="$2"
 113         local link="6to4-$cfg"
 114
 115         local local4=$(uci_get network "$cfg" ipaddr)
 116
 117         local mtu
 118         config_get mtu "$cfg" mtu
 119
 120         local ttl
 121         config_get ttl "$cfg" ttl
 122
 123         local metric
 124         config_get metric "$cfg" metric
 125
 126         local defaultroute
 127         config_get_bool defaultroute "$cfg" defaultroute 1
 128
 129         local wanif=$(find_6to4_wanif)
 130         [ -z "$wanif" ] && {
 131                 logger -t "$link" "Cannot find wan interface - aborting"
 132                 return
 133         }
 134
 135         local wancfg=$(find_config "$wanif")
 136         [ -z "$wancfg" ] && {
 137                 logger -t "$link" "Cannot find wan network - aborting"
 138                 return
 139         }
 140
 141         # If local4 is unset, guess local IPv4 address from the
 142         # interface used by the default route.
 143         [ -z "$local4" ] && {
 144                 [ -n "$wanif" ] && {
 145                         local4=$(find_6to4_wanip "$wanif")
 146                         uci_set_state network "$cfg" wan_device "$wanif"
 147                 }
 148         }
 149
 150         test_6to4_rfc1918 "$local4" && {
 151                 logger -t "$link" "Local wan ip $local4 is private - aborting"
 152                 return
 153         }
 154
 155         [ -n "$local4" ] && {
 156                 logger -t "$link" "Starting ..."
 157
 158                 # creating the tunnel below will trigger a net subsystem event
 159                 # prevent it from touching or iface by disabling .auto here
 160                 uci_set_state network "$cfg" ifname $link
 161                 uci_set_state network "$cfg" auto 0
 162
 163                 # find our local prefix
 164                 local prefix6=$(find_6to4_prefix "$local4")
 165                 local local6="$prefix6::1/16"
 166
 167                 logger -t "$link" " * IPv4 address is $local4"
 168                 logger -t "$link" " * IPv6 address is $local6"
 169                 ip tunnel add $link mode sit remote any local $local4 ttl ${ttl:-64}
 170                 ip link set $link up
 171                 ip link set mtu ${mtu:-1280} dev $link
 172                 ip addr add $local6 dev $link
 173
 174                 uci_set_state network "$cfg" ipaddr $local4
 175                 uci_set_state network "$cfg" ip6addr $local6
 176
 177                 [ "$defaultroute" = 1 ] && {
 178                         logger -t "$link" " * Adding default route"
 179                         ip -6 route add 2000::/3 via ::192.88.99.1 metric ${metric:-1} dev $link
 180                         uci_set_state network "$cfg" defaultroute 1
 181                 }
 182
 183                 [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
 184                         local sid="6to4_$cfg"
 185
 186                         uci_revert_state radvd
 187                         config_load radvd
 188
 189                         # find delegation target
 190                         local adv_interface
 191                         config_get adv_interface "$cfg" adv_interface
 192
 193                         local adv_subnet=$(uci_get network "$cfg" adv_subnet)
 194                               adv_subnet=$((0x${adv_subnet:-1}))
 195
 196                         local adv_subnets=""
 197
 198                         for adv_interface in ${adv_interface:-lan}; do
 199                                 local adv_ifname
 200                                 config_get adv_ifname "${adv_interface:-lan}" ifname
 201
 202                                 grep -qs "^ *$adv_ifname:" /proc/net/dev && {
 203                                         local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
 204
 205                                         logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
 206                                         ip -6 addr add $subnet6 dev $adv_ifname
 207
 208                                         set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
 209                                         set_6to4_radvd_prefix    "$sid" "$adv_interface" \
 210                                                 "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)"
 211
 212                                         adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
 213                                         adv_subnet=$(($adv_subnet + 1))
 214                                 }
 215                         done
 216
 217                         uci_set_state network "$cfg" adv_subnets "$adv_subnets"
 218
 219                         /etc/init.d/radvd restart
 220                 }
 221
 222                 logger -t "$link" "... started"
 223
 224                 env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
 225         } || {
 226                 echo "Cannot determine local IPv4 address for 6to4 tunnel $cfg - skipping"
 227         }
 228 }
 229
 230 stop_interface_6to4() {
 231         local cfg="$1"
 232         local link="6to4-$cfg"
 233
 234         local local6=$(uci_get_state network "$cfg" ip6addr)
 235         local defaultroute=$(uci_get_state network "$cfg" defaultroute)
 236
 237         local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
 238
 239         grep -qs "^ *$link:" /proc/net/dev && {
 240                 logger -t "$link" "Shutting down ..."
 241                 env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
 242
 243                 [ -n "$adv_subnets" ] && {
 244                         uci_revert_state radvd
 245                         /etc/init.d/radvd enabled && /etc/init.d/radvd restart
 246
 247                         local adv_subnet
 248                         for adv_subnet in $adv_subnets; do
 249                                 local ifname="${adv_subnet%%:*}"
 250                                 local subnet="${adv_subnet#*:}"
 251
 252                                 logger -t "$link" " * Removing IPv6 subnet $subnet from interface $ifname"
 253                                 ip -6 addr del $subnet dev $ifname
 254                         done
 255                 }
 256
 257                 [ "$defaultroute" = "1" ] && \
 258                         ip -6 route del 2000::/3 via ::192.88.99.1 dev $link
 259
 260                 ip addr del $local6 dev $link
 261                 ip link set $link down
 262                 ip tunnel del $link
 263
 264                 logger -t "$link" "... stopped"
 265         }
 266 }