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=$(ip -4 r l e 0/0); if="${if#default via * 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]* brd *}"
  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
  32         config_get local4 "$cfg" ipaddr
  33
  34         local remote4
  35         config_get remote4 "$cfg" peeraddr
  36
  37         local local6
  38         config_get local6 "$cfg" ip6addr
  39
  40         local mtu
  41         config_get mtu "$cfg" mtu
  42
  43         local ttl
  44         config_get ttl "$cfg" ttl
  45
  46         local defaultroute
  47         config_get_bool defaultroute "$cfg" defaultroute 1
  48
  49         # If local4 is unset, guess local IPv4 address from the
  50         # interface used by the default route.
  51         [ -z "$local4" ] && {
  52                 local wanif=$(find_6in4_wanif)
  53                 [ -n "$wanif" ] && {
  54                         local4=$(find_6in4_wanip "$wanif")
  55                         uci_set_state network "$cfg" wan_device "$wanif"
  56                 }
  57         }
  58
  59         [ -n "$local4" ] && {
  60                 # creating the tunnel below will trigger a net subsystem event
  61                 # prevent it from touching or iface by disabling .auto here
  62                 uci_set_state network "$cfg" ifname $link
  63                 uci_set_state network "$cfg" auto 0
  64
  65                 ip tunnel add $link mode sit remote $remote4 local $local4 ttl 255
  66                 ip link set $link up
  67                 ip link set mtu ${mtu:-1280} dev $link
  68                 ip tunnel change $link ttl ${ttl:-64}
  69                 ip addr add $local6 dev $link
  70
  71                 uci_set_state network "$cfg" ipaddr $local4
  72                 uci_set_state network "$cfg" ip6addr $local6
  73
  74                 [ "$defaultroute" = 1 ] && {
  75                         ip -6 route add ::/0 dev $link
  76                         uci_set_state network "$cfg" defaultroute 1
  77                 }
  78
  79                 env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
  80         } || {
  81                 echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping"
  82         }
  83 }
  84
  85 stop_interface_6in4() {
  86         local cfg="$1"
  87         local link="6in4-$cfg"
  88
  89         local local6=$(uci_get_state network "$cfg" ip6addr)
  90         local defaultroute=$(uci_get_state network "$cfg" defaultroute)
  91
  92         grep -qs "^ *$link:" /proc/net/dev && {
  93                 env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
  94
  95                 [ "$defaultroute" = "1" ] && {
  96                         ip -6 route del ::/0 dev $link
  97                 }
  98
  99                 ip addr del $local6 dev $link
 100                 ip link set $link down
 101                 ip tunnel del $link
 102         }
 103 }