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 vlt="${5:-300}"
  68         local plt="${6:-120}"
  69         local pfxsection=""
  70
  71         find_pfxsection() {
  72                 local net base
  73                 local cfg="$1"
  74                 config_get net  "$cfg" interface
  75                 config_get base "$cfg" Base6to4Interface
  76
  77                 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
  78                         pfxsection="$cfg"
  79                         return 1
  80                 }
  81         }
  82
  83         config_foreach find_pfxsection prefix
  84
  85         [ -z "$pfxsection" ] && {
  86                 pfxsection="prefix_${sid}_${lanif}"
  87                 uci_set_state radvd "$pfxsection" ""                   prefix
  88                 uci_set_state radvd "$pfxsection" ignore               0
  89                 uci_set_state radvd "$pfxsection" interface            "$lanif"
  90                 uci_set_state radvd "$pfxsection" prefix               "$prefix"
  91                 uci_set_state radvd "$pfxsection" AdvOnLink            1
  92                 uci_set_state radvd "$pfxsection" AdvAutonomous        1
  93                 uci_set_state radvd "$pfxsection" AdvValidLifetime     "$vlt"
  94                 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
  95                 uci_set_state radvd "$pfxsection" Base6to4Interface    "$wanif"
  96         }
  97 }
  98
  99
 100 # Hook into scan_interfaces() to synthesize a .device option
 101 # This is needed for /sbin/ifup to properly dispatch control
 102 # to setup_interface_6to4() even if no .ifname is set in
 103 # the configuration.
 104 scan_6to4() {
 105         config_set "$1" device "6to4-$1"
 106 }
 107
 108 coldplug_interface_6to4() {
 109         setup_interface_6to4 "6to4-$1" "$1"
 110 }
 111
 112 setup_interface_6to4() {
 113         local iface="$1"
 114         local cfg="$2"
 115         local link="6to4-$cfg"
 116
 117         local local4=$(uci_get network "$cfg" ipaddr)
 118
 119         local mtu
 120         config_get mtu "$cfg" mtu
 121
 122         local ttl
 123         config_get ttl "$cfg" ttl
 124
 125         local metric
 126         config_get metric "$cfg" metric
 127
 128         local defaultroute
 129         config_get_bool defaultroute "$cfg" defaultroute 1
 130
 131         local wanif=$(find_6to4_wanif)
 132         [ -z "$wanif" ] && {
 133                 logger -t "$link" "Cannot find wan interface - aborting"
 134                 return
 135         }
 136
 137         local wancfg=$(find_config "$wanif")
 138         [ -z "$wancfg" ] && {
 139                 logger -t "$link" "Cannot find wan network - aborting"
 140                 return
 141         }
 142
 143         # If local4 is unset, guess local IPv4 address from the
 144         # interface used by the default route.
 145         [ -z "$local4" ] && {
 146                 [ -n "$wanif" ] && {
 147                         local4=$(find_6to4_wanip "$wanif")
 148                         uci_set_state network "$cfg" wan_device "$wanif"
 149                 }
 150         }
 151
 152         test_6to4_rfc1918 "$local4" && {
 153                 logger -t "$link" "Local wan ip $local4 is private - aborting"
 154                 return
 155         }
 156
 157         [ -n "$local4" ] && {
 158                 logger -t "$link" "Starting ..."
 159
 160                 # creating the tunnel below will trigger a net subsystem event
 161                 # prevent it from touching or iface by disabling .auto here
 162                 uci_set_state network "$cfg" ifname $link
 163                 uci_set_state network "$cfg" auto 0
 164
 165                 # find our local prefix
 166                 local prefix6=$(find_6to4_prefix "$local4")
 167                 local local6="$prefix6::1/16"
 168
 169                 logger -t "$link" " * IPv4 address is $local4"
 170                 logger -t "$link" " * IPv6 address is $local6"
 171                 ip tunnel add $link mode sit remote any local $local4 ttl ${ttl:-64}
 172                 ip link set $link up
 173                 ip link set mtu ${mtu:-1280} dev $link
 174                 ip addr add $local6 dev $link
 175
 176                 uci_set_state network "$cfg" ipaddr $local4
 177                 uci_set_state network "$cfg" ip6addr $local6
 178
 179                 [ "$defaultroute" = 1 ] && {
 180                         logger -t "$link" " * Adding default route"
 181                         ip -6 route add ::/0 via ::192.88.99.1 metric ${metric:-1} dev $link
 182                         uci_set_state network "$cfg" defaultroute 1
 183                 }
 184
 185                 [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
 186                         local sid="6to4_$cfg"
 187
 188                         uci_revert_state radvd
 189                         config_load radvd
 190
 191                         # find delegation target
 192                         local adv_interface
 193                         config_get adv_interface "$cfg" adv_interface
 194
 195                         local adv_subnet=$(uci_get network "$cfg" adv_subnet)
 196                               adv_subnet=$((0x${adv_subnet:-1}))
 197
 198                         local adv_subnets=""
 199
 200                         for adv_interface in ${adv_interface:-lan}; do
 201                                 local adv_ifname
 202                                 config_get adv_ifname "${adv_interface:-lan}" ifname
 203
 204                                 grep -qs "^ *$adv_ifname:" /proc/net/dev && {
 205                                         local adv_valid_lifetime adv_preferred_lifetime
 206                                         config_get adv_valid_lifetime     "${adv_interface:-lan}" adv_valid_lifetime
 207                                         config_get adv_preferred_lifetime "${adv_interface:-lan}" adv_preferred_lifetime
 208
 209                                         local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
 210
 211                                         logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
 212                                         ip -6 addr add $subnet6 dev $adv_ifname
 213
 214                                         set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
 215                                         set_6to4_radvd_prefix    "$sid" "$adv_interface" \
 216                                                 "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
 217                                                 "$adv_valid_lifetime" "$adv_preferred_lifetime"
 218
 219                                         adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
 220                                         adv_subnet=$(($adv_subnet + 1))
 221                                 }
 222                         done
 223
 224                         uci_set_state network "$cfg" adv_subnets "$adv_subnets"
 225
 226                         /etc/init.d/radvd restart
 227                 }
 228
 229                 logger -t "$link" "... started"
 230
 231                 env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
 232         } || {
 233                 echo "Cannot determine local IPv4 address for 6to4 tunnel $cfg - skipping"
 234         }
 235 }
 236
 237 stop_interface_6to4() {
 238         local cfg="$1"
 239         local link="6to4-$cfg"
 240
 241         local local6=$(uci_get_state network "$cfg" ip6addr)
 242         local defaultroute=$(uci_get_state network "$cfg" defaultroute)
 243
 244         local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
 245
 246         grep -qs "^ *$link:" /proc/net/dev && {
 247                 logger -t "$link" "Shutting down ..."
 248                 env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
 249
 250                 [ -n "$adv_subnets" ] && {
 251                         uci_revert_state radvd
 252                         /etc/init.d/radvd enabled && /etc/init.d/radvd restart
 253
 254                         local adv_subnet
 255                         for adv_subnet in $adv_subnets; do
 256                                 local ifname="${adv_subnet%%:*}"
 257                                 local subnet="${adv_subnet#*:}"
 258
 259                                 logger -t "$link" " * Removing IPv6 subnet $subnet from interface $ifname"
 260                                 ip -6 addr del $subnet dev $ifname
 261                         done
 262                 }
 263
 264                 [ "$defaultroute" = "1" ] && \
 265                         ip -6 route del ::/0 via ::192.88.99.1 dev $link
 266
 267                 ip addr del $local6 dev $link
 268                 ip link set $link down
 269                 ip tunnel del $link
 270
 271                 logger -t "$link" "... stopped"
 272         }
 273 }