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+# tayga.sh - NAT64 backend
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+
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+find_tayga_wanif4() {
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+ local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
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+ [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
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+}
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+
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+find_tayga_wanip4() {
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+ local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
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+ echo "${ip%%[^0-9.]*}"
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+}
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+
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+find_tayga_wanif6() {
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+ local if=$(ip -6 r l e ::/0); if="${if#default* dev }"; if="${if%% *}"
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+ [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
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+}
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+
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+find_tayga_wanip6() {
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+ local ip=$(ip -6 a s dev "$1"); ip="${ip#*inet6 }"
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+ echo "${ip%%[^0-9A-Fa-f:]*}"
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+}
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+
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+# Hook into scan_interfaces() to synthesize a .device option
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+# This is needed for /sbin/ifup to properly dispatch control
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+# to setup_interface_tayga() even if no .ifname is set in
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+# the configuration.
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+scan_tayga() {
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+ config_set "$1" device "tayga-$1"
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+}
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+
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+coldplug_interface_tayga() {
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+ setup_interface_tayga "tayga-$1" "$1"
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+}
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+
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+tayga_add_static_mappings() {
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+ local tmpconf="$1"
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+
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+ (
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+ . /lib/functions.sh
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+ config_load firewall
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+
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+ tayga_map_rule_add() {
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+ local cfg="$1"
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+ local tmpconf="$2"
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+ local ipv4_addr ipv6_addr
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+ config_get ipv4_addr "$cfg" ipv4_addr ""
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+ config_get ipv6_addr "$cfg" ipv6_addr ""
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+ [ -n "$ipv4_addr" ] && [ -n "$ipv6_addr" ] &&
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+ echo "map $ipv4_addr $ipv6_addr" >>$tmpconf
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+ }
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+
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+ config_foreach tayga_map_rule_add nat64 "$tmpconf"
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+ )
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+}
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+
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+setup_interface_tayga() {
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+ local iface="$1"
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+ local cfg="$2"
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+ local link="tayga-$cfg"
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+
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+ local ipv4_addr ipv6_addr prefix dynamic_pool
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+
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+ config_get ipv4_addr "$cfg" ipv4_addr
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+ config_get ipv6_addr "$cfg" ipv6_addr
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+ config_get prefix "$cfg" prefix
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+ config_get dynamic_pool "$cfg" dynamic_pool
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+
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+ local args
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+
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+ include /lib/network
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+ scan_interfaces
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+
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+ local wanip4=$(uci_get network "$cfg" ipv4addr)
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+ local wanip6=$(uci_get network "$cfg" ipv6addr)
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+
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+ local wanif4=$(find_tayga_wanif4)
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+ local wanif6=$(find_tayga_wanif6)
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+
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+ [ -z "$wanip4" ] && {
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+ [ -n "$wanif4" ] && {
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+ wanip4=$(find_tayga_wanip4 "$wanif4")
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+ uci_set_state network "$cfg" wan4_device "$wanif4"
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+ }
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+ }
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+
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+ [ -z "$wanip6" ] && {
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+ [ -n "$wanif6" ] && {
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+ wanip6=$(find_tayga_wanip6 "$wanif6")
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+ uci_set_state network "$cfg" wan6_device "$wanif6"
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+ }
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+ }
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+
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+ [ -n "$wanip4" ] && [ -n "$wanip6" ] || {
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+ echo "Cannot determine local IPv4 and IPv6 addressed for tayga NAT64 $cfg - skipping"
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+ return 1
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+ }
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+
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+ local tmpconf="/var/etc/tayga-$cfg.conf"
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+ args="-c $tmpconf"
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+ mkdir -p /var/etc
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+ mkdir -p /var/run/tayga/$cfg
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+
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+ echo "tun-device $link" >$tmpconf
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+ echo "ipv4-addr $ipv4_addr" >>$tmpconf
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+ [ -n "$ipv6_addr" ] &&
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+ echo "ipv6-addr $ipv6_addr" >>$tmpconf
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+ [ -n "$prefix" ] &&
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+ echo "prefix $prefix" >>$tmpconf
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+
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+ tayga_add_static_mappings "$tmpconf"
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+
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+ [ -n "$dynamic_pool" ] &&
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+ echo "dynamic-pool $dynamic_pool" >>$tmpconf
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+ echo "data-dir /var/run/tayga/$cfg" >>$tmpconf
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+
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+ # creating the tunnel below will trigger a net subsystem event
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+ # prevent it from touching or iface by disabling .auto here
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+ uci_set_state network "$cfg" ifname $link
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+ uci_set_state network "$cfg" auto 0
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+
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+ # here we create TUN device and check configuration
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+ tayga $args --mktun || return 1
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+
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+ ip link set "$link" up
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+
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+ ip addr add "$wanip4" dev "$link"
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+ ip addr add "$wanip6" dev "$link"
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+
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+ [ -n "$dynamic_pool" ] &&
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+ ip -4 route add "$dynamic_pool" dev "$link"
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+ [ -n "$prefix" ] &&
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+ ip -6 route add "$prefix" dev "$link"
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+
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+ start-stop-daemon -S -x tayga -- $args -p /var/run/$link.pid
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+
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+ env -i ACTION="ifup" DEVICE="$link" INTERFACE="$cfg" PROTO="tayga" \
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+ /sbin/hotplug-call iface
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+}
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+
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+stop_interface_tayga() {
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+ local cfg="$1"
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+ local link="tayga-$cfg"
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+
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+ env -i ACTION="ifdown" DEVICE="$link" INTERFACE="$cfg" PROTO="tayga" \
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+ /sbin/hotplug-call iface
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+
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+ service_kill tayga "/var/run/$link.pid"
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+
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+ ip link set "$link" down
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+ ip addr flush dev "$link"
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+ ip route flush dev "$link"
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+}
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Ondřej Caletka
10 years ago