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 conf_rule_add() {
  36         local cfg="$1"
  37         local tmpconf="$2"
  38         local ipv4_addr ipv6_addr
  39         config_get ipv4_addr "$cfg" ipv4_addr ""
  40         config_get ipv6_addr "$cfg" ipv6_addr ""
  41         [ -n "$ipv4_addr" ] && [ -n "$ipv6_addr" ] &&
  42                 echo "map $ipv4_addr $ipv6_addr" >>$tmpconf
  43 }
  44
  45 setup_interface_tayga() {
  46         local iface="$1"
  47         local cfg="$2"
  48         local link="tayga-$cfg"
  49
  50         local ipv4_addr ipv6_addr prefix dynamic_pool
  51
  52         config_get ipv4_addr "$cfg" ipv4_addr
  53         config_get ipv6_addr "$cfg" ipv6_addr
  54         config_get prefix "$cfg" prefix
  55         config_get dynamic_pool "$cfg" dynamic_pool
  56
  57         local args
  58
  59         include /lib/network
  60         scan_interfaces
  61
  62         local wanip4=$(uci_get network "$cfg" ipv4addr)
  63         local wanip6=$(uci_get network "$cfg" ipv6addr)
  64
  65         local wanif4=$(find_tayga_wanif4)
  66         local wanif6=$(find_tayga_wanif6)
  67
  68         [ -z "$wanip4" ] && {
  69                 [ -n "$wanif4" ] && {
  70                         wanip4=$(find_tayga_wanip4 "$wanif4")
  71                         uci_set_state network "$cfg" wan4_device "$wanif4"
  72                 }
  73         }
  74
  75         [ -z "$wanip6" ] && {
  76                 [ -n "$wanif6" ] && {
  77                         wanip6=$(find_tayga_wanip6 "$wanif6")
  78                         uci_set_state network "$cfg" wan6_device "$wanif6"
  79                 }
  80         }
  81
  82         [ -n "$wanip4" ] && [ -n "$wanip6" ] || {
  83                 echo "Cannot determine local IPv4 and IPv6 addressed for tayga NAT64 $cfg - skipping"
  84                 return
  85         }
  86
  87         local tmpconf="/var/etc/tayga-$cfg.conf"
  88         args="-c $tmpconf"
  89         mkdir -p /var/etc
  90         mkdir -p /var/run/tayga/$cfg
  91
  92         echo "tun-device $link" >$tmpconf
  93         echo "ipv4-addr $ipv4_addr" >>$tmpconf
  94         [ -n "$ipv6_addr" ] &&
  95                 echo "ipv6-addr $ipv6_addr" >>$tmpconf
  96         [ -n "$prefix" ] &&
  97                 echo "prefix $prefix" >>$tmpconf
  98
  99         config_foreach conf_rule_add map_rule "$tmpconf"
 100
 101         [ -n "$dynamic_pool" ] &&
 102                 echo "dynamic-pool $dynamic_pool" >>$tmpconf
 103         echo "data-dir /var/run/tayga/$cfg" >>$tmpconf
 104
 105         # creating the tunnel below will trigger a net subsystem event
 106         # prevent it from touching or iface by disabling .auto here
 107         uci_set_state network "$cfg" ifname $link
 108         uci_set_state network "$cfg" auto 0
 109
 110         tayga $args --mktun
 111         ip link set "$link" up
 112
 113         ip addr add "$wanip4" dev "$link"
 114         ip addr add "$wanip6" dev "$link"
 115
 116         [ -n "$dynamic_pool" ] &&
 117                 ip -4 route add "$dynamic_pool" dev "$link"
 118         [ -n "$prefix" ] &&
 119                 ip -6 route add "$prefix" dev "$link"
 120
 121         start-stop-daemon -S -x tayga -- $args -p /var/run/$link.pid
 122
 123         env -i ACTION="ifup" DEVICE="$link" INTERFACE="$cfg" PROTO="tayga" \
 124                 /sbin/hotplug-call iface
 125 }
 126
 127 stop_interface_tayga() {
 128         local cfg="$1"
 129         local link="tayga-$cfg"
 130
 131         env -i ACTION="ifdown" DEVICE="$link" INTERFACE="$cfg" PROTO="tayga" \
 132                 /sbin/hotplug-call iface
 133
 134         service_kill tayga "/var/run/$link.pid"
 135
 136         ip link set "$link" down
 137         ip addr flush dev "$link"
 138         ip route flush dev "$link"
 139 }