[package] 6to4: implement metric option
[openwrt/svn-archive/archive.git] / package / 6in4 / files / 6in4.sh
1 # 6in4.sh - IPv6-in-IPv4 tunnel backend
2 # Copyright (c) 2010 OpenWrt.org
3
4 find_6in4_wanif() {
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"
7 }
8
9 find_6in4_wanip() {
10 local ip=$(ip -4 a s dev "$1"); ip="${ip#*inet }"
11 echo "${ip%%[^0-9.]*}"
12 }
13
14 # Hook into scan_interfaces() to synthesize a .device option
15 # This is needed for /sbin/ifup to properly dispatch control
16 # to setup_interface_6in4() even if no .ifname is set in
17 # the configuration.
18 scan_6in4() {
19 config_set "$1" device "6in4-$1"
20 }
21
22 coldplug_interface_6in4() {
23 setup_interface_6in4 "6in4-$1" "$1"
24 }
25
26 setup_interface_6in4() {
27 local iface="$1"
28 local cfg="$2"
29 local link="6in4-$cfg"
30
31 local local4=$(uci_get network "$cfg" ipaddr)
32
33 local remote4
34 config_get remote4 "$cfg" peeraddr
35
36 local local6
37 config_get local6 "$cfg" ip6addr
38
39 local mtu
40 config_get mtu "$cfg" mtu
41
42 local ttl
43 config_get ttl "$cfg" ttl
44
45 local defaultroute
46 config_get_bool defaultroute "$cfg" defaultroute 1
47
48 # If local4 is unset, guess local IPv4 address from the
49 # interface used by the default route.
50 [ -z "$local4" ] && {
51 local wanif=$(find_6in4_wanif)
52 [ -n "$wanif" ] && {
53 local4=$(find_6in4_wanip "$wanif")
54 uci_set_state network "$cfg" wan_device "$wanif"
55 }
56 }
57
58 [ -n "$local4" ] && {
59 # creating the tunnel below will trigger a net subsystem event
60 # prevent it from touching or iface by disabling .auto here
61 uci_set_state network "$cfg" ifname $link
62 uci_set_state network "$cfg" auto 0
63
64 ip tunnel add $link mode sit remote $remote4 local $local4 ttl ${ttl:-64}
65 ip link set $link up
66 ip link set mtu ${mtu:-1280} dev $link
67 ip addr add $local6 dev $link
68
69 uci_set_state network "$cfg" ipaddr $local4
70 uci_set_state network "$cfg" ip6addr $local6
71
72 [ "$defaultroute" = 1 ] && {
73 ip -6 route add ::/0 dev $link
74 uci_set_state network "$cfg" defaultroute 1
75 }
76
77 env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
78 } || {
79 echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping"
80 }
81 }
82
83 stop_interface_6in4() {
84 local cfg="$1"
85 local link="6in4-$cfg"
86
87 local local6=$(uci_get_state network "$cfg" ip6addr)
88 local defaultroute=$(uci_get_state network "$cfg" defaultroute)
89
90 grep -qs "^ *$link:" /proc/net/dev && {
91 env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
92
93 [ "$defaultroute" = "1" ] && {
94 ip -6 route del ::/0 dev $link
95 }
96
97 ip addr del $local6 dev $link
98 ip link set $link down
99 ip tunnel del $link
100 }
101 }