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