dd438601fa62159542b944bd661ffb6402af7360
[openwrt/openwrt.git] / package / 6in4 / files / 6in4.sh
1 #!/bin/sh
2 # 6in4.sh - IPv6-in-IPv4 tunnel backend
3 # Copyright (c) 2010 OpenWrt.org
4
5 [ -n "$INCLUDE_ONLY" ] || {
6 . /lib/functions.sh
7 . ../netifd-proto.sh
8 init_proto "$@"
9 }
10
11 find_6in4_wanif() {
12 local if=$(ip -4 r l e 0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
13 [ -n "$if" ] && grep -qs "^ *$if:" /proc/net/dev && echo "$if"
14 }
15
16 find_6in4_wanip() {
17 local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
18 echo "${ip%%[^0-9.]*}"
19 }
20
21 tun_error() {
22 local cfg="$1"; shift;
23
24 [ -n "$1" ] && proto_notify_error "$cfg" "$@"
25 proto_block_restart "$cfg"
26 }
27
28 proto_6in4_setup() {
29 local cfg="$1"
30 local iface="$2"
31 local link="6in4-$cfg"
32
33 json_get_var mtu mtu
34 json_get_var ttl ttl
35 json_get_var local4 ipaddr
36 json_get_var remote4 peeraddr
37 json_get_var ip6addr ip6addr
38 json_get_var tunnelid tunnelid
39 json_get_var username username
40 json_get_var password password
41
42 [ -z "$ip6addr" -o -z "$remote4" ] && {
43 tun_error "$cfg" "MISSING_ADDRESS"
44 return
45 }
46
47 [ -z "$local4" ] && {
48 local wanif=$(find_6in4_wanif)
49 [ -z "$wanif" ] && {
50 tun_error "$cfg" "NO_WAN_LINK"
51 return
52 }
53
54 . /lib/network/config.sh
55 local wancfg="$(find_config "$wanif")"
56 [ -z "$wancfg" ] && {
57 tun_error "$cfg" "NO_WAN_LINK"
58 return
59 }
60
61 # If local4 is unset, guess local IPv4 address from the
62 # interface used by the default route.
63 [ -n "$wanif" ] && local4=$(find_6in4_wanip "$wanif")
64
65 [ -z "$local4" ] && {
66 tun_error "$cfg" "NO_WAN_LINK"
67 return
68 }
69 }
70
71 local local6="${ip6addr%%/*}"
72 local mask6="${ip6addr##*/}"
73 [[ "$local6" = "$mask6" ]] && mask6=
74
75 proto_init_update "$link" 1
76 proto_add_ipv6_address "$local6" "$mask6"
77 proto_add_ipv6_route "::" 0
78
79 proto_add_tunnel
80 json_add_string mode sit
81 json_add_int mtu "${mtu:-1280}"
82 json_add_int ttl "${ttl:-64}"
83 json_add_string local "$local4"
84 json_add_string remote "$remote4"
85 proto_close_tunnel
86
87 proto_send_update "$cfg"
88
89 [ -n "$tunnelid" -a -n "$username" -a -n "$password" ] && {
90 [ "${#password}" == 32 -a -z "${password//[a-fA-F0-9]/}" ] || {
91 password="$(echo -n "$password" | md5sum)"; password="${password%% *}"
92 }
93
94 local url="http://ipv4.tunnelbroker.net/ipv4_end.php?ip=AUTO&apikey=$username&pass=$password&tid=$tunnelid"
95 local try=0
96 local max=3
97
98 while [ $((++try)) -le $max ]; do
99 wget -qO/dev/null "$url" 2>/dev/null && break
100 sleep 1
101 done
102 }
103 }
104
105 proto_6in4_teardown() {
106 local cfg="$1"
107 }
108
109 proto_6in4_init_config() {
110 no_device=1
111 available=1
112
113 proto_config_add_string "ipaddr"
114 proto_config_add_string "ip6addr"
115 proto_config_add_string "peeraddr"
116 proto_config_add_string "tunnelid"
117 proto_config_add_string "username"
118 proto_config_add_string "password"
119 proto_config_add_int "mtu"
120 proto_config_add_int "ttl"
121 }
122
123 [ -n "$INCLUDE_ONLY" ] || {
124 add_protocol 6in4
125 }