6to4: load the network config to fix radvd announce (#11467)
[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
35 # RFC 6598
36 [ $1 -eq 100 ] && [ $2 -ge 64 ] && [ $2 -le 127 ] && return 0
37
38 return 1
39 }
40
41 set_6to4_radvd_interface() {
42 local cfgid="$1"
43 local lanif="${2:-lan}"
44 local ifmtu="${3:-1280}"
45 local ifsection=""
46
47 find_ifsection() {
48 local net
49 local cfg="$1"
50 config_get net "$cfg" interface
51
52 [ "$net" = "$lanif" ] && {
53 ifsection="$cfg"
54 return 1
55 }
56 }
57
58 config_foreach find_ifsection interface
59
60 [ -z "$ifsection" ] && {
61 ifsection="iface_$sid"
62 uci_set_state radvd "$ifsection" "" interface
63 uci_set_state radvd "$ifsection" interface "$lanif"
64 }
65
66 uci_set_state radvd "$ifsection" ignore 0
67 uci_set_state radvd "$ifsection" IgnoreIfMissing 1
68 uci_set_state radvd "$ifsection" AdvSendAdvert 1
69 uci_set_state radvd "$ifsection" MaxRtrAdvInterval 30
70 uci_set_state radvd "$ifsection" AdvLinkMTU "$ifmtu"
71 }
72
73 set_6to4_radvd_prefix() {
74 local cfgid="$1"
75 local lanif="${2:-lan}"
76 local wanif="${3:-wan}"
77 local prefix="${4:-0:0:0:1::/64}"
78 local vlt="${5:-300}"
79 local plt="${6:-120}"
80 local pfxsection=""
81
82 find_pfxsection() {
83 local net base
84 local cfg="$1"
85 config_get net "$cfg" interface
86 config_get base "$cfg" Base6to4Interface
87
88 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
89 pfxsection="$cfg"
90 return 1
91 }
92 }
93
94 config_foreach find_pfxsection prefix
95
96 [ -z "$pfxsection" ] && {
97 pfxsection="prefix_${sid}_${lanif}"
98 uci_set_state radvd "$pfxsection" "" prefix
99 uci_set_state radvd "$pfxsection" ignore 0
100 uci_set_state radvd "$pfxsection" interface "$lanif"
101 uci_set_state radvd "$pfxsection" prefix "$prefix"
102 uci_set_state radvd "$pfxsection" AdvOnLink 1
103 uci_set_state radvd "$pfxsection" AdvAutonomous 1
104 uci_set_state radvd "$pfxsection" AdvValidLifetime "$vlt"
105 uci_set_state radvd "$pfxsection" AdvPreferredLifetime "$plt"
106 uci_set_state radvd "$pfxsection" Base6to4Interface "$wanif"
107 }
108 }
109
110 tun_error() {
111 local cfg="$1"; shift;
112
113 [ -n "$1" ] && proto_notify_error "$cfg" "$@"
114 proto_block_restart "$cfg"
115 }
116
117 proto_6to4_setup() {
118 local cfg="$1"
119 local iface="$2"
120 local link="6to4-$cfg"
121
122 json_get_var mtu mtu
123 json_get_var ttl ttl
124 json_get_var local4 ipaddr
125
126 json_get_var adv_subnet adv_subnet
127 json_get_var adv_interface adv_interface
128 json_get_var adv_valid_lifetime adv_valid_lifetime
129 json_get_var adv_preferred_lifetime adv_preferred_lifetime
130
131 local wanif=$(find_6to4_wanif)
132 [ -z "$wanif" ] && {
133 tun_error "$cfg" "NO_WAN_LINK"
134 return
135 }
136
137 . /lib/network/config.sh
138 local wancfg="$(find_config "$wanif")"
139 [ -z "$wancfg" ] && {
140 tun_error "$cfg" "NO_WAN_LINK"
141 return
142 }
143
144 # If local4 is unset, guess local IPv4 address from the
145 # interface used by the default route.
146 [ -z "$local4" ] && {
147 [ -n "$wanif" ] && local4=$(find_6to4_wanip "$wanif")
148 }
149
150 [ -z "$local4" ] && {
151 tun_error "$cfg" "NO_WAN_LINK"
152 return
153 }
154
155 test_6to4_rfc1918 "$local4" && {
156 tun_error "$cfg" "INVALID_LOCAL_ADDRESS"
157 return
158 }
159
160 # find our local prefix
161 local prefix6=$(find_6to4_prefix "$local4")
162 local local6="$prefix6::1"
163
164 proto_init_update "$link" 1
165 proto_add_ipv6_address "$local6" 16
166 proto_add_ipv6_route "::" 0 "::192.88.99.1"
167
168 proto_add_tunnel
169 json_add_string mode sit
170 json_add_int mtu "${mtu:-1280}"
171 json_add_int ttl "${ttl:-64}"
172 json_add_string local "$local4"
173 proto_close_tunnel
174
175 proto_send_update "$cfg"
176
177 [ -f /etc/config/radvd ] && /etc/init.d/radvd enabled && {
178 local sid="6to4_$cfg"
179
180 uci_revert_state radvd
181 config_load radvd
182 config_load network
183
184 adv_subnet=$((0x${adv_subnet:-1}))
185
186 local adv_subnets=""
187
188 for adv_interface in ${adv_interface:-lan}; do
189 local adv_ifname
190 config_get adv_ifname "${adv_interface:-lan}" ifname
191
192 grep -qs "^ *$adv_ifname:" /proc/net/dev && {
193 local subnet6="$(printf "%s:%x::1/64" "$prefix6" $adv_subnet)"
194
195 logger -t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
196 ip -6 addr add $subnet6 dev $adv_ifname
197
198 set_6to4_radvd_interface "$sid" "$adv_interface" "$mtu"
199 set_6to4_radvd_prefix "$sid" "$adv_interface" \
200 "$wancfg" "$(printf "0:0:0:%x::/64" $adv_subnet)" \
201 "$adv_valid_lifetime" "$adv_preferred_lifetime"
202
203 adv_subnets="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
204 adv_subnet=$(($adv_subnet + 1))
205 }
206 done
207
208 uci_set_state network "$cfg" adv_subnets "$adv_subnets"
209
210 /etc/init.d/radvd restart
211 }
212 }
213
214 proto_6to4_teardown() {
215 local cfg="$1"
216 local link="6to4-$cfg"
217
218 local adv_subnets=$(uci_get_state network "$cfg" adv_subnets)
219
220 grep -qs "^ *$link:" /proc/net/dev && {
221 [ -n "$adv_subnets" ] && {
222 uci_revert_state radvd
223 /etc/init.d/radvd enabled && /etc/init.d/radvd restart
224 }
225 }
226 }
227
228 proto_6to4_init_config() {
229 no_device=1
230 available=1
231
232 proto_config_add_string "ipaddr"
233 proto_config_add_int "mtu"
234 proto_config_add_int "ttl"
235 proto_config_add_string "adv_interface"
236 proto_config_add_string "adv_subnet"
237 proto_config_add_int "adv_valid_lifetime"
238 proto_config_add_int "adv_preferred_lifetime"
239 }
240
241 [ -n "$INCLUDE_ONLY" ] || {
242 add_protocol 6to4
243 }