ipv6/tayga/files/tayga.sh

   1 # tayga.sh - NAT64 backend
   2
   3 find_tayga_wanif4() {
   4         local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
   5         [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
   6 }
   7
   8 find_tayga_wanip4() {
   9         local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
  10         echo "${ip%%[^0-9.]*}"
  11 }
  12
  13 find_tayga_wanif6() {
  14         local if=$(ip -6 r l e ::/0); if="${if#default* dev }"; if="${if%% *}"
  15         [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
  16 }
  17
  18 find_tayga_wanip6() {
  19         local ip=$(ip -6 a s dev "$1"); ip="${ip#*inet6 }"
  20         echo "${ip%%[^0-9A-Fa-f:]*}"
  21 }
  22
  23 # Hook into scan_interfaces() to synthesize a .device option
  24 # This is needed for /sbin/ifup to properly dispatch control
  25 # to setup_interface_tayga() even if no .ifname is set in
  26 # the configuration.
  27 scan_tayga() {
  28         config_set "$1" device "tayga-$1"
  29 }
  30
  31 coldplug_interface_tayga() {
  32         setup_interface_tayga "tayga-$1" "$1"
  33 }
  34
  35 tayga_add_static_mappings() {
  36         local tmpconf="$1"
  37
  38         (
  39                 . /lib/functions.sh
  40                 config_load firewall
  41
  42                 tayga_map_rule_add() {
  43                         local cfg="$1"
  44                         local tmpconf="$2"
  45                         local ipv4_addr ipv6_addr
  46                         config_get ipv4_addr "$cfg" ipv4_addr ""
  47                         config_get ipv6_addr "$cfg" ipv6_addr ""
  48                         [ -n "$ipv4_addr" ] && [ -n "$ipv6_addr" ] &&
  49                                 echo "map $ipv4_addr $ipv6_addr" >>$tmpconf
  50                 }
  51
  52                 config_foreach tayga_map_rule_add nat64 "$tmpconf"
  53         )
  54 }
  55
  56 setup_interface_tayga() {
  57         local iface="$1"
  58         local cfg="$2"
  59         local link="tayga-$cfg"
  60
  61         local ipv4_addr ipv6_addr prefix dynamic_pool
  62
  63         config_get ipv4_addr "$cfg" ipv4_addr
  64         config_get ipv6_addr "$cfg" ipv6_addr
  65         config_get prefix "$cfg" prefix
  66         config_get dynamic_pool "$cfg" dynamic_pool
  67
  68         local args
  69
  70         include /lib/network
  71         scan_interfaces
  72
  73         local wanip4=$(uci_get network "$cfg" ipv4addr)
  74         local wanip6=$(uci_get network "$cfg" ipv6addr)
  75
  76         local wanif4=$(find_tayga_wanif4)
  77         local wanif6=$(find_tayga_wanif6)
  78
  79         [ -z "$wanip4" ] && {
  80                 [ -n "$wanif4" ] && {
  81                         wanip4=$(find_tayga_wanip4 "$wanif4")
  82                         uci_set_state network "$cfg" wan4_device "$wanif4"
  83                 }
  84         }
  85
  86         [ -z "$wanip6" ] && {
  87                 [ -n "$wanif6" ] && {
  88                         wanip6=$(find_tayga_wanip6 "$wanif6")
  89                         uci_set_state network "$cfg" wan6_device "$wanif6"
  90                 }
  91         }
  92
  93         [ -n "$wanip4" ] && [ -n "$wanip6" ] || {
  94                 echo "Cannot determine local IPv4 and IPv6 addressed for tayga NAT64 $cfg - skipping"
  95                 return 1
  96         }
  97
  98         local tmpconf="/var/etc/tayga-$cfg.conf"
  99         args="-c $tmpconf"
 100         mkdir -p /var/etc
 101         mkdir -p /var/run/tayga/$cfg
 102
 103         echo "tun-device $link" >$tmpconf
 104         echo "ipv4-addr $ipv4_addr" >>$tmpconf
 105         [ -n "$ipv6_addr" ] &&
 106                 echo "ipv6-addr $ipv6_addr" >>$tmpconf
 107         [ -n "$prefix" ] &&
 108                 echo "prefix $prefix" >>$tmpconf
 109
 110         tayga_add_static_mappings "$tmpconf"
 111
 112         [ -n "$dynamic_pool" ] &&
 113                 echo "dynamic-pool $dynamic_pool" >>$tmpconf
 114         echo "data-dir /var/run/tayga/$cfg" >>$tmpconf
 115
 116         # creating the tunnel below will trigger a net subsystem event
 117         # prevent it from touching or iface by disabling .auto here
 118         uci_set_state network "$cfg" ifname $link
 119         uci_set_state network "$cfg" auto 0
 120
 121         # here we create TUN device and check configuration
 122         tayga $args --mktun || return 1
 123
 124         ip link set "$link" up
 125
 126         ip addr add "$wanip4" dev "$link"
 127         ip addr add "$wanip6" dev "$link"
 128
 129         [ -n "$dynamic_pool" ] &&
 130                 ip -4 route add "$dynamic_pool" dev "$link"
 131         [ -n "$prefix" ] &&
 132                 ip -6 route add "$prefix" dev "$link"
 133
 134         start-stop-daemon -S -x tayga -- $args -p /var/run/$link.pid
 135
 136         env -i ACTION="ifup" DEVICE="$link" INTERFACE="$cfg" PROTO="tayga" \
 137                 /sbin/hotplug-call iface
 138 }
 139
 140 stop_interface_tayga() {
 141         local cfg="$1"
 142         local link="tayga-$cfg"
 143
 144         env -i ACTION="ifdown" DEVICE="$link" INTERFACE="$cfg" PROTO="tayga" \
 145                 /sbin/hotplug-call iface
 146
 147         service_kill tayga "/var/run/$link.pid"
 148
 149         ip link set "$link" down
 150         ip addr flush dev "$link"
 151         ip route flush dev "$link"
 152 }