1 # 6to4.sh - IPv6-in-IPv4 tunnel backend
2 # Copyright (c) 2010 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
21 # Hook into scan_interfaces() to synthesize a .device option
22 # This is needed for /sbin/ifup to properly dispatch control
23 # to setup_interface_6to4() even if no .ifname is set in
26 config_set
"$1" device
"6to4-$1"
29 coldplug_interface_6to4
() {
30 setup_interface_6to4
"6to4-$1" "$1"
33 setup_interface_6to4
() {
36 local link
="6to4-$cfg"
38 local local4
=$
(uci_get network
"$cfg" ipaddr
)
41 config_get mtu
"$cfg" mtu
44 config_get ttl
"$cfg" ttl
47 config_get_bool defaultroute
"$cfg" defaultroute
1
49 local wanif
=$
(find_6to4_wanif
)
51 logger
-t "$link" "Cannot find wan interface - aborting"
55 local wancfg
=$
(find_config
"$wanif")
57 logger
-t "$link" "Cannot find wan network - aborting"
61 # If local4 is unset, guess local IPv4 address from the
62 # interface used by the default route.
65 local4
=$
(find_6to4_wanip
"$wanif")
66 uci_set_state network
"$cfg" wan_device
"$wanif"
71 logger
-t "$link" "Starting ..."
73 # creating the tunnel below will trigger a net subsystem event
74 # prevent it from touching or iface by disabling .auto here
75 uci_set_state network
"$cfg" ifname
$link
76 uci_set_state network
"$cfg" auto
0
78 # find our local prefix
79 local prefix6
=$
(find_6to4_prefix
"$local4")
80 local local6
="$prefix6::1/16"
82 logger
-t "$link" " * IPv4 address is $local4"
83 logger
-t "$link" " * IPv6 address is $local6"
84 ip tunnel add
$link mode sit remote any
local $local4 ttl
${ttl:-64}
86 ip link
set mtu
${mtu:-1280} dev
$link
87 ip addr add
$local6 dev
$link
89 uci_set_state network
"$cfg" ipaddr
$local4
90 uci_set_state network
"$cfg" ip6addr
$local6
92 [ "$defaultroute" = 1 ] && {
93 logger
-t "$link" " * Adding default route"
94 ip
-6 route add
2000::/3 via
::192.88.99.1 dev
$link metric
1
95 uci_set_state network
"$cfg" defaultroute
1
98 # find delegation target
100 config_get adv_interface
"$cfg" adv_interface
103 config_get adv_ifname
"${adv_interface:-lan}" ifname
105 local adv_subnet
=$
(uci_get network
"$cfg" adv_subnet
)
107 grep -qs "^ *$adv_ifname:" /proc
/net
/dev
&& {
108 local subnet6
="$prefix6:${adv_subnet:-1}::1/64"
110 logger
-t "$link" " * Advertising IPv6 subnet $subnet6 on ${adv_interface:-lan} ($adv_ifname)"
111 ip
-6 addr add
$subnet6 dev
$adv_ifname
112 uci_set_state network
"$cfg" adv_subnet
"$subnet6"
113 uci_set_state network
"$cfg" adv_ifname
"$adv_ifname"
115 [ -f /etc
/config
/radvd
] && /etc
/init.d
/radvd enabled
&& {
116 local sid
="6to4_$cfg"
119 delete radvd.iface_$sid
120 delete radvd.prefix_$sid
121 set radvd.iface_$sid=interface
122 set radvd.iface_$sid.ignore=0
123 set radvd.iface_$sid.interface=${adv_interface:-lan}
124 set radvd.iface_$sid.IgnoreIfMissing=1
125 set radvd.iface_$sid.AdvSendAdvert=1
126 set radvd.iface_$sid.MaxRtrAdvInterval=30
127 set radvd.prefix_$sid=prefix
128 set radvd.prefix_$sid.ignore=0
129 set radvd.prefix_$sid.interface=${adv_interface:-lan}
130 set radvd.prefix_$sid.prefix=0:0:0:${adv_subnet:-1}::/64
131 set radvd.prefix_$sid.AdvOnLink=1
132 set radvd.prefix_$sid.AdvAutonomous=1
133 set radvd.prefix_$sid.AdvValidLifetime=300
134 set radvd.prefix_$sid.AdvPreferredLifetime=120
135 set radvd.prefix_$sid.Base6to4Interface=$wancfg
138 /etc
/init.d
/radvd restart
142 logger
-t "$link" "... started"
144 env
-i ACTION
="ifup" INTERFACE
="$cfg" DEVICE
="$link" PROTO
=6to4
/sbin
/hotplug-call
"iface" &
146 echo "Cannot determine local IPv4 address for 6to4 tunnel $cfg - skipping"
150 stop_interface_6to4
() {
152 local link
="6to4-$cfg"
154 local local6
=$
(uci_get_state network
"$cfg" ip6addr
)
155 local defaultroute
=$
(uci_get_state network
"$cfg" defaultroute
)
157 local adv_subnet
=$
(uci_get_state network
"$cfg" adv_subnet
)
158 local adv_ifname
=$
(uci_get_state network
"$cfg" adv_ifname
)
160 grep -qs "^ *$link:" /proc
/net
/dev
&& {
161 logger
-t "$link" "Shutting down ..."
162 env
-i ACTION
="ifdown" INTERFACE
="$cfg" DEVICE
="$link" PROTO
=6to4
/sbin
/hotplug-call
"iface" &
164 [ -n "$adv_subnet" ] && [ -n "$adv_ifname" ] && {
165 local sid
="6to4_$cfg"
168 delete radvd.iface_$sid
169 delete radvd.prefix_$sid
172 /etc
/init.d
/radvd enabled
&& /etc
/init.d
/radvd restart
174 ip
-6 addr del
$adv_subnet dev
$adv_ifname
177 [ "$defaultroute" = "1" ] && {
178 ip
-6 route del
2000::/3 via
::192.88.99.1 dev
$link metric
1
181 ip addr del
$local6 dev
$link
182 ip link
set $link down
185 logger
-t "$link" "... stopped"