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#!/bin/sh
# 6in4.sh - IPv6-in-IPv4 tunnel backend
# Copyright (c) 2010 OpenWrt.org
[ -n "$INCLUDE_ONLY" ] || {
. /etc/functions.sh
. ../netifd-proto.sh
init_proto "$@"
}
find_6in4_wanif() {
local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
[ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
}
find_6in4_wanip() {
local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
echo "${ip%%[^0-9.]*}"
}
# Hook into scan_interfaces() to synthesize a .device option
# This is needed for /sbin/ifup to properly dispatch control
# to setup_interface_6in4() even if no .ifname is set in
# the configuration.
scan_6in4() {
config_set "$1" device "6in4-$1"
}
coldplug_interface_6in4() {
setup_interface_6in4 "6in4-$1" "$1"
}
tun_error() {
local cfg="$1"; shift;
[ -n "$1" ] && proto_notify_error "$cfg" "$@"
proto_block_restart "$cfg"
}
proto_6in4_setup() {
local cfg="$1"
local iface="$2"
local link="6in4-$cfg"
json_get_var mtu mtu
json_get_var ttl ttl
json_get_var local4 ipaddr
json_get_var remote4 peeraddr
json_get_var ip6addr ip6addr
json_get_var tunnelid tunnelid
json_get_var username username
json_get_var password password
[ -z "$ip6addr" -o -z "$remote4" ] && {
tun_error "$cfg" "MISSING_ADDRESS"
return
}
[ -z "$local4" ] && {
local wanif=$(find_6in4_wanif)
[ -z "$wanif" ] && {
tun_error "$cfg" "NO_WAN_LINK"
return
}
. /lib/network/config.sh
local wancfg="$(find_config "$wanif")"
[ -z "$wancfg" ] && {
tun_error "$cfg" "NO_WAN_LINK"
return
}
# If local4 is unset, guess local IPv4 address from the
# interface used by the default route.
[ -n "$wanif" ] && local4=$(find_6in4_wanip "$wanif")
[ -z "$local4" ] && {
tun_error "$cfg" "NO_WAN_LINK"
return
}
}
local local6="${ip6addr%%/*}"
local mask6="${ip6addr##*/}"
[[ "$local6" = "$mask6" ]] && mask6=
proto_init_update "$link" 1
proto_add_ipv6_address "$local6" "$mask6"
proto_add_ipv6_route "::" 0
proto_add_tunnel
json_add_string mode sit
json_add_int mtu "${mtu:-1280}"
json_add_int ttl "${ttl:-64}"
json_add_string local "$local4"
json_add_string remote "$remote4"
proto_close_tunnel
proto_send_update "$cfg"
[ -n "$tunnelid" -a -n "$username" -a -n "$password" ] && {
[ "${#password}" == 32 -a -z "${password//[a-fA-F0-9]/}" ] || {
password="$(echo -n "$password" | md5sum)"; password="${password%% *}"
}
local url="http://ipv4.tunnelbroker.net/ipv4_end.php?ip=AUTO&apikey=$username&pass=$password&tid=$tunnelid"
local try=0
local max=3
while [ $((++try)) -le $max ]; do
wget -qO/dev/null "$url" 2>/dev/null && break
sleep 1
done
}
}
proto_6in4_teardown() {
local cfg="$1"
}
proto_6in4_init_config() {
no_device=1
available=1
proto_config_add_string "ipaddr"
proto_config_add_string "ip6addr"
proto_config_add_string "peeraddr"
proto_config_add_string "tunnelid"
proto_config_add_string "username"
proto_config_add_string "password"
proto_config_add_int "mtu"
proto_config_add_int "ttl"
}
[ -n "$INCLUDE_ONLY" ] || {
add_protocol 6in4
}
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