package/6to4/files.old/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
  28         # RFC 6598
  29         [ $1 -eq 100 ] && [ $2 -ge  64 ] && [ $2 -le 127 ] && return 0
  30
  31         return 1
  32 }
  33
  34 set_6to4_radvd_interface() {
  35         local cfgid="$1"
  36         local lanif="${2:-lan}"
  37         local ifmtu="${3:-1280}"
  38         local ifsection=""
  39
  40         find_ifsection() {
  41                 local net
  42                 local cfg="$1"
  43                 config_get net "$cfg" interface
  44
  45                 [ "$net" = "$lanif" ] && {
  46                         ifsection="$cfg"
  47                         return 1
  48                 }
  49         }
  50
  51         config_foreach find_ifsection interface
  52
  53         [ -z "$ifsection" ] && {
  54                 ifsection="iface_$sid"
  55                 uci_set_state radvd "$ifsection" "" interface
  56                 uci_set_state radvd "$ifsection" interface "$lanif"
  57         }
  58
  59         uci_set_state radvd "$ifsection" ignore            0
  60         uci_set_state radvd "$ifsection" IgnoreIfMissing   1
  61         uci_set_state radvd "$ifsection" AdvSendAdvert     1
  62         uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
  63         uci_set_state radvd "$ifsection" AdvLinkMTU        "$ifmtu"
  64 }
  65
  66 set_6to4_radvd_prefix() {
  67         local cfgid="$1"
  68         local lanif="${2:-lan}"
  69         local wanif="${3:-wan}"
  70         local prefix="${4:-0:0:0:1::/64}"
  71         local vlt="${5:-300}"
  72         local plt="${6:-120}"
  73         local pfxsection=""
  74
  75         find_pfxsection() {
  76                 local net base
  77                 local cfg="$1"
  78                 config_get net  "$cfg" interface
  79                 config_get base "$cfg" Base6to4Interface
  80
  81                 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
  82                         pfxsection="$cfg"
  83                         return 1
  84                 }
  85         }
  86
  87         config_foreach find_pfxsection prefix
  88
  89         [ -z "$pfxsection" ] && {
  90                 pfxsection="prefix_${sid}_${lanif}"
  91                 uci_set_state radvd "$pfxsection" ""                   prefix
  92                 uci_set_state radvd "$pfxsection" ignore               0
  93                 uci_set_state radvd "$pfxsection" interface            "$lanif"
  94                 uci_set_state radvd "$pfxsection" prefix               "$prefix"
  95                 uci_set_state radvd "$pfxsection" AdvOnLink            1
  96                 uci_set_state radvd "$pfxsection" AdvAutonomous        1
  97                 uci_set_state radvd "$pfxsection" AdvValidLifetime     "$vlt"
  98                 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
  99                 uci_set_state radvd "$pfxsection" Base6to4Interface    "$wanif"
 100         }
 101 }
 102
 103
 104 # Hook into scan_interfaces() to synthesize a .device option
 105 # This is needed for /sbin/ifup to properly dispatch control
 106 # to setup_interface_6to4() even if no .ifname is set in
 107 # the configuration.
 108 scan_6to4() {
 109         config_set "$1" device "6to4-$1"
 110 }
 111
 112 coldplug_interface_6to4() {
 113         setup_interface_6to4 "6to4-$1" "$1"
 114 }
 115
 116 setup_interface_6to4() {
 117         local iface="$1"
 118         local cfg="$2"
 119         local link="6to4-$cfg"
 120
 121         local local4=$(uci_get network "$cfg" ipaddr)
 122
 123         local mtu
 124         config_get mtu "$cfg" mtu
 125
 126         local ttl
 127         config_get ttl "$cfg" ttl
 128
 129         local metric
 130         config_get metric "$cfg" metric
 131
 132         local defaultroute
 133         config_get_bool defaultroute "$cfg" defaultroute 1
 134
 135         local wanif=$(find_6to4_wanif)
 136         [ -z "$wanif" ] && {
 137                 logger -t "$link" "Cannot find wan interface - aborting"
 138                 return
 139         }
 140
 141         local wancfg=$(find_config "$wanif")
 142         [ -z "$wancfg" ] && {
 143                 logger -t "$link" "Cannot find wan network - aborting"
 144                 return
 145         }
 146
 147         # If local4 is unset, guess local IPv4 address from the
 148         # interface used by the default route.
 149         [ -z "$local4" ] && {
 150                 [ -n "$wanif" ] && {
 151                         local4=$(find_6to4_wanip "$wanif")
 152                         uci_set_state network "$cfg" wan_device "$wanif"
 153                 }
 154         }
 155
 156         test_6to4_rfc1918 "$local4" && {
 157                 logger -t "$link" "Local wan ip $local4 is private - aborting"
 158                 return
 159         }
 160
 161         [ -n "$local4" ] && {
 162                 logger -t "$link" "Starting ..."
 163
 164                 # creating the tunnel below will trigger a net subsystem event
 165                 # prevent it from touching or iface by disabling .auto here
 166                 uci_set_state network "$cfg" ifname $link
 167                 uci_set_state network "$cfg" auto 0
 168
 169                 # find our local prefix
 170                 local prefix6=$(find_6to4_prefix "$local4")
 171                 local local6="$prefix6::1/16"
 172
 173                 logger -t "$link" " * IPv4 address is $local4"
 174                 logger -t "$link" " * IPv6 address is $local6"
 175                 ip tunnel add $link mode sit remote any local $local4 ttl ${ttl:-64}
 176                 ip link set $link up
 177                 ip link set mtu ${mtu:-1280} dev $link
 178                 ip addr add $local6 dev $link
 179
 180                 uci_set_state network "$cfg" ipaddr $local4
 181                 uci_set_state network "$cfg" ip6addr $local6
 182
 183                 [ "$defaultroute" = 1 ] && {
 184                         logger -t "$link" " * Adding default route"
 185                         ip -6 route add ::/0 via ::192.88.99.1 metric ${metric:-1} dev $link
 186                         uci_set_state network "$cfg" defaultroute 1
 187                 }
 188
 189                 [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
 190                         local sid="6to4_$cfg"
 191
 192                         uci_revert_state radvd
 193                         config_load radvd
 194
 195                         # find delegation target
 196                         local adv_interface
 197                         config_get adv_interface "$cfg" adv_interface
 198
 199                         local adv_subnet=$(uci_get network "$cfg" adv_subnet)
 200                               adv_subnet=$((0x${adv_subnet:-1}))
 201
 202                         local adv_subnets=""
 203
 204                         for adv_interface in ${adv_interface:-lan}; do
 205                                 local adv_ifname
 206                                 config_get adv_ifname "${adv_interface:-lan}" ifname
 207
 208                                 grep -qs "^ *$adv_ifname:" /proc/net/dev && {
 209                                         local adv_valid_lifetime adv_preferred_lifetime
 210                                         config_get adv_valid_lifetime     "$cfg" adv_valid_lifetime
 211                                         config_get adv_preferred_lifetime "$cfg" adv_preferred_lifetime
 212
 213                                         local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
 214
 215                                         logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
 216                                         ip -6 addr add $subnet6 dev $adv_ifname
 217
 218                                         set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
 219                                         set_6to4_radvd_prefix    "$sid" "$adv_interface" \
 220                                                 "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
 221                                                 "$adv_valid_lifetime" "$adv_preferred_lifetime"
 222
 223                                         adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
 224                                         adv_subnet=$(($adv_subnet + 1))
 225                                 }
 226                         done
 227
 228                         uci_set_state network "$cfg" adv_subnets "$adv_subnets"
 229
 230                         /etc/init.d/radvd restart
 231                 }
 232
 233                 logger -t "$link" "... started"
 234
 235                 env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
 236         } || {
 237                 echo "Cannot determine local IPv4 address for 6to4 tunnel $cfg - skipping"
 238         }
 239 }
 240
 241 stop_interface_6to4() {
 242         local cfg="$1"
 243         local link="6to4-$cfg"
 244
 245         local local6=$(uci_get_state network "$cfg" ip6addr)
 246         local defaultroute=$(uci_get_state network "$cfg" defaultroute)
 247
 248         local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
 249
 250         grep -qs "^ *$link:" /proc/net/dev && {
 251                 logger -t "$link" "Shutting down ..."
 252                 env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6to4 /sbin/hotplug-call "iface" &
 253
 254                 [ -n "$adv_subnets" ] && {
 255                         uci_revert_state radvd
 256                         /etc/init.d/radvd enabled && /etc/init.d/radvd restart
 257
 258                         local adv_subnet
 259                         for adv_subnet in $adv_subnets; do
 260                                 local ifname="${adv_subnet%%:*}"
 261                                 local subnet="${adv_subnet#*:}"
 262
 263                                 logger -t "$link" " * Removing IPv6 subnet $subnet from interface $ifname"
 264                                 ip -6 addr del $subnet dev $ifname
 265                         done
 266                 }
 267
 268                 [ "$defaultroute" = "1" ] && \
 269                         ip -6 route del ::/0 via ::192.88.99.1 dev $link
 270
 271                 ip addr del $local6 dev $link
 272                 ip link set $link down
 273                 ip tunnel del $link
 274
 275                 logger -t "$link" "... stopped"
 276         }
 277 }