6to4: set the tunnel remote endpoint to any, put the gateway in the route instead
[openwrt/svn-archive/archive.git] / package / 6to4 / files / 6to4.sh
1 #!/bin/sh
2 # 6to4.sh - IPv6-in-IPv4 tunnel backend
3 # Copyright (c) 2010-2012 OpenWrt.org
4
5 [ -n "$INCLUDE_ONLY" ] || {
6 . /etc/functions.sh
7 . ../netifd-proto.sh
8 init_proto "$@"
9 }
10
11 find_6to4_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_6to4_wanip() {
17 local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
18 echo "${ip%%[^0-9.]*}"
19 }
20
21 find_6to4_prefix() {
22 local ip4="$1"
23 local oIFS="$IFS"; IFS="."; set -- $ip4; IFS="$oIFS"
24
25 printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
26 }
27
28 test_6to4_rfc1918()
29 {
30 local oIFS="$IFS"; IFS="."; set -- $1; IFS="$oIFS"
31 [ $1 -eq 10 ] && return 0
32 [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
33 [ $1 -eq 172 ] && [ $2 -ge 16 ] && [ $2 -le 31 ] && return 0
34 return 1
35 }
36
37 set_6to4_radvd_interface() {
38 local cfgid="$1"
39 local lanif="${2:-lan}"
40 local ifmtu="${3:-1280}"
41 local ifsection=""
42
43 find_ifsection() {
44 local net
45 local cfg="$1"
46 config_get net "$cfg" interface
47
48 [ "$net" = "$lanif" ] && {
49 ifsection="$cfg"
50 return 1
51 }
52 }
53
54 config_foreach find_ifsection interface
55
56 [ -z "$ifsection" ] && {
57 ifsection="iface_$sid"
58 uci_set_state radvd "$ifsection" "" interface
59 uci_set_state radvd "$ifsection" interface "$lanif"
60 }
61
62 uci_set_state radvd "$ifsection" ignore 0
63 uci_set_state radvd "$ifsection" IgnoreIfMissing 1
64 uci_set_state radvd "$ifsection" AdvSendAdvert 1
65 uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
66 uci_set_state radvd "$ifsection" AdvLinkMTU "$ifmtu"
67 }
68
69 set_6to4_radvd_prefix() {
70 local cfgid="$1"
71 local lanif="${2:-lan}"
72 local wanif="${3:-wan}"
73 local prefix="${4:-0:0:0:1::/64}"
74 local vlt="${5:-300}"
75 local plt="${6:-120}"
76 local pfxsection=""
77
78 find_pfxsection() {
79 local net base
80 local cfg="$1"
81 config_get net "$cfg" interface
82 config_get base "$cfg" Base6to4Interface
83
84 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
85 pfxsection="$cfg"
86 return 1
87 }
88 }
89
90 config_foreach find_pfxsection prefix
91
92 [ -z "$pfxsection" ] && {
93 pfxsection="prefix_${sid}_${lanif}"
94 uci_set_state radvd "$pfxsection" "" prefix
95 uci_set_state radvd "$pfxsection" ignore 0
96 uci_set_state radvd "$pfxsection" interface "$lanif"
97 uci_set_state radvd "$pfxsection" prefix "$prefix"
98 uci_set_state radvd "$pfxsection" AdvOnLink 1
99 uci_set_state radvd "$pfxsection" AdvAutonomous 1
100 uci_set_state radvd "$pfxsection" AdvValidLifetime "$vlt"
101 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
102 uci_set_state radvd "$pfxsection" Base6to4Interface "$wanif"
103 }
104 }
105
106 tun_error() {
107 local cfg="$1"; shift;
108
109 [ -n "$1" ] && proto_notify_error "$cfg" "$@"
110 proto_block_restart "$cfg"
111 }
112
113 proto_6to4_setup() {
114 local cfg="$1"
115 local iface="$2"
116 local link="6to4-$cfg"
117
118 json_get_var mtu mtu
119 json_get_var ttl ttl
120 json_get_var local4 ipaddr
121
122 json_get_var adv_subnet adv_subnet
123 json_get_var adv_interface adv_interface
124 json_get_var adv_valid_lifetime adv_valid_lifetime
125 json_get_var adv_preferred_lifetime adv_preferred_lifetime
126
127 local wanif=$(find_6to4_wanif)
128 [ -z "$wanif" ] && {
129 tun_error "NO_WAN_LINK"
130 return
131 }
132
133 . /lib/network/config.sh
134 local wancfg="$(find_config "$wanif")"
135 [ -z "$wancfg" ] && {
136 tun_error "NO_WAN_LINK"
137 return
138 }
139
140 # If local4 is unset, guess local IPv4 address from the
141 # interface used by the default route.
142 [ -z "$local4" ] && {
143 [ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif")
144 }
145
146 [ -z "$local4" ] && {
147 tun_error "NO_WAN_LINK"
148 return
149 }
150
151 test_6to4_rfc1918 "$local4" && {
152 tun_error "INVALID_LOCAL_ADDRESS"
153 return
154 }
155
156 # find our local prefix
157 local prefix6=$(find_6to4_prefix "$local4")
158 local local6="$prefix6::1"
159
160 proto_init_update "$link" 1
161 proto_add_ipv6_address "$local6" 16
162 proto_add_ipv6_route "::" 0 "::192.88.99.1"
163
164 proto_add_tunnel
165 json_add_string mode sit
166 json_add_int mtu "${mtu:-1280}"
167 json_add_int ttl "${ttl:-64}"
168 json_add_string local "$local4"
169 proto_close_tunnel
170
171 proto_send_update "$cfg"
172
173 [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
174 local sid="6to4_$cfg"
175
176 uci_revert_state radvd
177 config_load radvd
178
179 adv_subnet=$((0x${adv_subnet:-1}))
180
181 local adv_subnets=""
182
183 for adv_interface in ${adv_interface:-lan}; do
184 local adv_ifname
185 config_get adv_ifname "${adv_interface:-lan}" ifname
186
187 grep -qs "^ *$adv_ifname:" /proc/net/dev && {
188 local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
189
190 logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
191 ip -6 addr add $subnet6 dev $adv_ifname
192
193 set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
194 set_6to4_radvd_prefix "$sid" "$adv_interface" \
195 "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
196 "$adv_valid_lifetime" "$adv_preferred_lifetime"
197
198 adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
199 adv_subnet=$(($adv_subnet + 1))
200 }
201 done
202
203 uci_set_state network "$cfg" adv_subnets "$adv_subnets"
204
205 /etc/init.d/radvd restart
206 }
207 }
208
209 proto_6to4_teardown() {
210 local cfg="$1"
211 local link="6to4-$cfg"
212
213 local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
214
215 grep -qs "^ *$link:" /proc/net/dev && {
216 [ -n "$adv_subnets" ] && {
217 uci_revert_state radvd
218 /etc/init.d/radvd enabled && /etc/init.d/radvd restart
219 }
220 }
221 }
222
223 proto_6to4_init_config() {
224 no_device=1
225 available=1
226
227 proto_config_add_string "ipaddr"
228 proto_config_add_int "mtu"
229 proto_config_add_int "ttl"
230 proto_config_add_string "adv_interface"
231 proto_config_add_string "adv_subnet"
232 proto_config_add_int "adv_valid_lifetime"
233 proto_config_add_int "adv_preferred_lifetime"
234 }
235
236 [ -n "$INCLUDE_ONLY" ] || {
237 add_protocol 6to4
238 }