package/6to4/files/6to4.sh

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