6in4: implement metric option
[openwrt/openwrt.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 metric
46 config_get metric "$cfg" metric
47
48 local defaultroute
49 config_get_bool defaultroute "$cfg" defaultroute 1
50
51 # If local4 is unset, guess local IPv4 address from the
52 # interface used by the default route.
53 [ -z "$local4" ] && {
54 local wanif=$(find_6in4_wanif)
55 [ -n "$wanif" ] && {
56 local4=$(find_6in4_wanip "$wanif")
57 uci_set_state network "$cfg" wan_device "$wanif"
58 }
59 }
60
61 [ -n "$local4" ] && {
62 # creating the tunnel below will trigger a net subsystem event
63 # prevent it from touching or iface by disabling .auto here
64 uci_set_state network "$cfg" ifname $link
65 uci_set_state network "$cfg" auto 0
66
67 ip tunnel add $link mode sit remote $remote4 local $local4 ttl ${ttl:-64}
68 ip link set $link up
69 ip link set mtu ${mtu:-1280} dev $link
70 ip addr add $local6 dev $link
71
72 uci_set_state network "$cfg" ipaddr $local4
73 uci_set_state network "$cfg" ip6addr $local6
74
75 [ "$defaultroute" = 1 ] && {
76 ip -6 route add ::/0 ${metric:+metric $metric} dev $link
77 uci_set_state network "$cfg" defaultroute 1
78 }
79
80 env -i ACTION="ifup" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
81 } || {
82 echo "Cannot determine local IPv4 address for 6in4 tunnel $cfg - skipping"
83 }
84 }
85
86 stop_interface_6in4() {
87 local cfg="$1"
88 local link="6in4-$cfg"
89
90 local local6=$(uci_get_state network "$cfg" ip6addr)
91 local defaultroute=$(uci_get_state network "$cfg" defaultroute)
92
93 grep -qs "^ *$link:" /proc/net/dev && {
94 env -i ACTION="ifdown" INTERFACE="$cfg" DEVICE="$link" PROTO=6in4 /sbin/hotplug-call "iface" &
95
96 [ "$defaultroute" = "1" ] && {
97 ip -6 route del ::/0 dev $link
98 }
99
100 ip addr del $local6 dev $link
101 ip link set $link down
102 ip tunnel del $link
103 }
104 }