1 # 6to4.sh - IPv6-in-IPv4 tunnel backend
2 # Copyright (c) 2010-2011 OpenWrt.org
5 local if=$
(ip
-4 r l e
0.0.0.0/0); if="${if#default* dev }"; if="${if%% *}"
6 [ -n "$if" ] && grep -qs "^ *$if:" /proc
/net
/dev
&& echo "$if"
10 local ip
=$
(ip
-4 a s dev
"$1"); ip
="${ip#*inet }"
11 echo "${ip%%[^0-9.]*}"
16 local oIFS
="$IFS"; IFS
="."; set -- $ip4; IFS
="$oIFS"
18 printf "2002:%02x%02x:%02x%02x\n" $1 $2 $3 $4
23 local oIFS
="$IFS"; IFS
="."; set -- $1; IFS
="$oIFS"
24 [ $1 -eq 10 ] && return 0
25 [ $1 -eq 192 ] && [ $2 -eq 168 ] && return 0
26 [ $1 -eq 172 ] && [ $2 -ge 16 ] && [ $2 -le 31 ] && return 0
29 [ $1 -eq 100 ] && [ $2 -ge 64 ] && [ $2 -le 127 ] && return 0
34 set_6to4_radvd_interface
() {
36 local lanif
="${2:-lan}"
37 local ifmtu
="${3:-1280}"
43 config_get net
"$cfg" interface
45 [ "$net" = "$lanif" ] && {
51 config_foreach find_ifsection interface
53 [ -z "$ifsection" ] && {
54 ifsection
="iface_$sid"
55 uci_set_state radvd
"$ifsection" "" interface
56 uci_set_state radvd
"$ifsection" interface
"$lanif"
59 uci_set_state radvd
"$ifsection" ignore
0
60 uci_set_state radvd
"$ifsection" IgnoreIfMissing
1
61 uci_set_state radvd
"$ifsection" AdvSendAdvert
1
62 uci_set_state radvd
"$ifsection" MaxRtrAdvInterval
30
63 uci_set_state radvd
"$ifsection" AdvLinkMTU
"$ifmtu"
66 set_6to4_radvd_prefix
() {
68 local lanif
="${2:-lan}"
69 local wanif
="${3:-wan}"
70 local prefix
="${4:-0:0:0:1::/64}"
78 config_get net
"$cfg" interface
79 config_get base
"$cfg" Base6to4Interface
81 [ "$net" = "$lanif" ] && [ "$base" = "$wanif" ] && {
87 config_foreach find_pfxsection prefix
89 [ -z "$pfxsection" ] && {
90 pfxsection
="prefix_${sid}_${lanif}"
91 uci_set_state radvd
"$pfxsection" "" prefix
92 uci_set_state radvd
"$pfxsection" ignore
0
93 uci_set_state radvd
"$pfxsection" interface
"$lanif"
94 uci_set_state radvd
"$pfxsection" prefix
"$prefix"
95 uci_set_state radvd
"$pfxsection" AdvOnLink
1
96 uci_set_state radvd
"$pfxsection" AdvAutonomous
1
97 uci_set_state radvd
"$pfxsection" AdvValidLifetime
"$vlt"
98 uci_set_state radvd
"$pfxsection" AdvPreferredLifetime
"$plt"
99 uci_set_state radvd
"$pfxsection" Base6to4Interface
"$wanif"
104 # Hook into scan_interfaces() to synthesize a .device option
105 # This is needed for /sbin/ifup to properly dispatch control
106 # to setup_interface_6to4() even if no .ifname is set in
109 config_set
"$1" device
"6to4-$1"
112 coldplug_interface_6to4
() {
113 setup_interface_6to4
"6to4-$1" "$1"
116 setup_interface_6to4
() {
119 local link
="6to4-$cfg"
121 local local4
=$
(uci_get network
"$cfg" ipaddr
)
124 config_get mtu
"$cfg" mtu
127 config_get ttl
"$cfg" ttl
130 config_get metric
"$cfg" metric
133 config_get_bool defaultroute
"$cfg" defaultroute
1
135 local wanif
=$
(find_6to4_wanif
)
137 logger
-t "$link" "Cannot find wan interface - aborting"
141 local wancfg
=$
(find_config
"$wanif")
142 [ -z "$wancfg" ] && {
143 logger
-t "$link" "Cannot find wan network - aborting"
147 # If local4 is unset, guess local IPv4 address from the
148 # interface used by the default route.
149 [ -z "$local4" ] && {
151 local4
=$
(find_6to4_wanip
"$wanif")
152 uci_set_state network
"$cfg" wan_device
"$wanif"
156 test_6to4_rfc1918
"$local4" && {
157 logger
-t "$link" "Local wan ip $local4 is private - aborting"
161 [ -n "$local4" ] && {
162 logger
-t "$link" "Starting ..."
164 # creating the tunnel below will trigger a net subsystem event
165 # prevent it from touching or iface by disabling .auto here
166 uci_set_state network
"$cfg" ifname
$link
167 uci_set_state network
"$cfg" auto
0
169 # find our local prefix
170 local prefix6
=$
(find_6to4_prefix
"$local4")
171 local local6
="$prefix6::1/16"
173 logger
-t "$link" " * IPv4 address is $local4"
174 logger
-t "$link" " * IPv6 address is $local6"
175 ip tunnel add
$link mode sit remote any
local $local4 ttl
${ttl:-64}
177 ip link
set mtu
${mtu:-1280} dev
$link
178 ip addr add
$local6 dev
$link
180 uci_set_state network
"$cfg" ipaddr
$local4
181 uci_set_state network
"$cfg" ip6addr
$local6
183 [ "$defaultroute" = 1 ] && {
184 logger
-t "$link" " * Adding default route"
185 ip
-6 route add
::/0 via
::192.88.99.1 metric
${metric:-1} dev
$link
186 uci_set_state network
"$cfg" defaultroute
1
189 [ -f /etc
/config
/radvd
] && /etc
/init.d
/radvd enabled
&& {
190 local sid
="6to4_$cfg"
192 uci_revert_state radvd
195 # find delegation target
197 config_get adv_interface
"$cfg" adv_interface
199 local adv_subnet
=$
(uci_get network
"$cfg" adv_subnet
)
200 adv_subnet
=$
((0x
${adv_subnet:-1}))
204 for adv_interface
in ${adv_interface:-lan}; do
206 config_get adv_ifname
"${adv_interface:-lan}" ifname
208 grep -qs "^ *$adv_ifname:" /proc
/net
/dev
&& {
209 local adv_valid_lifetime adv_preferred_lifetime
210 config_get adv_valid_lifetime
"$cfg" adv_valid_lifetime
211 config_get adv_preferred_lifetime
"$cfg" adv_preferred_lifetime
213 local subnet6
="$(printf "%s
:%x
::1/64" "$prefix6" $adv_subnet)"
215 logger
-t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
216 ip
-6 addr add
$subnet6 dev
$adv_ifname
218 set_6to4_radvd_interface
"$sid" "$adv_interface" "$mtu"
219 set_6to4_radvd_prefix
"$sid" "$adv_interface" \
220 "$wancfg" "$(printf "0:0:0:%x
::/64" $adv_subnet)" \
221 "$adv_valid_lifetime" "$adv_preferred_lifetime"
223 adv_subnets
="${adv_subnets:+$adv_subnets }$adv_ifname:$subnet6"
224 adv_subnet
=$
(($adv_subnet + 1))
228 uci_set_state network
"$cfg" adv_subnets
"$adv_subnets"
230 /etc
/init.d
/radvd restart
233 logger
-t "$link" "... started"
235 env
-i ACTION
="ifup" INTERFACE
="$cfg" DEVICE
="$link" PROTO
=6to4
/sbin
/hotplug-call
"iface" &
237 echo "Cannot determine local IPv4 address for 6to4 tunnel $cfg - skipping"
241 stop_interface_6to4
() {
243 local link
="6to4-$cfg"
245 local local6
=$
(uci_get_state network
"$cfg" ip6addr
)
246 local defaultroute
=$
(uci_get_state network
"$cfg" defaultroute
)
248 local adv_subnets
=$
(uci_get_state network
"$cfg" adv_subnets
)
250 grep -qs "^ *$link:" /proc
/net
/dev
&& {
251 logger
-t "$link" "Shutting down ..."
252 env
-i ACTION
="ifdown" INTERFACE
="$cfg" DEVICE
="$link" PROTO
=6to4
/sbin
/hotplug-call
"iface" &
254 [ -n "$adv_subnets" ] && {
255 uci_revert_state radvd
256 /etc
/init.d
/radvd enabled
&& /etc
/init.d
/radvd restart
259 for adv_subnet
in $adv_subnets; do
260 local ifname
="${adv_subnet%%:*}"
261 local subnet
="${adv_subnet#*:}"
263 logger
-t "$link" " * Removing IPv6 subnet $subnet from interface $ifname"
264 ip
-6 addr del
$subnet dev
$ifname
268 [ "$defaultroute" = "1" ] && \
269 ip
-6 route del
::/0 via
::192.88.99.1 dev
$link
271 ip addr del
$local6 dev
$link
272 ip link
set $link down
275 logger
-t "$link" "... stopped"