package/6in4/files/6in4.sh

   1 # 6in4.sh - IPv6-in-IPv4 tunnel backend
   2 # Copyright (c) 2010 OpenWrt.org
   3
   4 find_6in4_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_6in4_wanip() {
  10         local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
  11         echo "${ip%%[^0-9.]*}"
  12 }
  13
  14 # Hook into scan_interfaces() to synthesize a .device option
  15 # This is needed for /sbin/ifup to properly dispatch control
  16 # to setup_interface_6in4() even if no .ifname is set in
  17 # the configuration.
  18 scan_6in4() {
  19         config_set "$1" device "6in4-$1"
  20 }
  21
  22 coldplug_interface_6in4() {
  23         setup_interface_6in4 "6in4-$1" "$1"
  24 }
  25
  26 setup_interface_6in4() {
  27         local iface="$1"
  28         local cfg="$2"
  29         local link="6in4-$cfg"
  30
  31         local local4=$(uci_get network "$cfg" ipaddr)
  32
  33         local remote4
  34         config_get remote4 "$cfg" peeraddr
  35
  36         local local6
  37         config_get local6 "$cfg" ip6addr
  38
  39         local mtu
  40         config_get mtu "$cfg" mtu
  41
  42         local ttl
  43         config_get ttl "$cfg" ttl
  44
  45         local metric
  46         config_get metric "$cfg" metric
  47
  48         local defaultroute
  49         config_get_bool defaultroute "$cfg" defaultroute 1
  50
  51         # If local4 is unset, guess local IPv4 address from the
  52         # interface used by the default route.
  53         [ -z "$local4" ] && {
  54                 local wanif=$(find_6in4_wanif)
  55                 [ -n "$wanif" ] && {
  56                         local4=$(find_6in4_wanip "$wanif")
  57                         uci_set_state network "$cfg" wan_device "$wanif"
  58                 }
  59         }
  60
  61         [ -n "$local4" ] && {
  62                 # creating the tunnel below will trigger a net subsystem event
  63                 # prevent it from touching or iface by disabling .auto here
  64                 uci_set_state network "$cfg" ifname $link
  65                 uci_set_state network "$cfg" auto 0
  66
  67                 ip tunnel add $link mode sit remote $remote4 local $local4 ttl ${ttl:-64}
  68                 ip link set $link up
  69                 ip link set mtu ${mtu:-1280} dev $link
  70                 ip addr add $local6 dev $link
  71
  72                 uci_set_state network "$cfg" ipaddr $local4
  73                 uci_set_state network "$cfg" ip6addr $local6
  74
  75                 [ "$defaultroute" = 1 ] && {
  76                         ip -6 route add ::/0 ${metric:+metric $metric} dev $link
  77                         uci_set_state network "$cfg" defaultroute 1
  78                 }
  79
  80                 env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
  81         } || {
  82                 echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping"
  83         }
  84 }
  85
  86 stop_interface_6in4() {
  87         local cfg="$1"
  88         local link="6in4-$cfg"
  89
  90         local local6=$(uci_get_state network "$cfg" ip6addr)
  91         local defaultroute=$(uci_get_state network "$cfg" defaultroute)
  92
  93         grep -qs "^ *$link:" /proc/net/dev && {
  94                 env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
  95
  96                 [ "$defaultroute" = "1" ] && {
  97                         ip -6 route del ::/0 dev $link
  98                 }
  99
 100                 ip addr del $local6 dev $link
 101                 ip link set $link down
 102                 ip tunnel del $link
 103         }
 104 }