fix a race condition with dynamic interfaces and firewalling
[openwrt/svn-archive/archive.git] / package / base-files / files / lib / network / config.sh
1 #!/bin/sh
2 # Copyright (C) 2006 OpenWrt.org
3
4 # DEBUG="echo"
5
6 find_config() {
7 local iftype device iface ifaces ifn
8 for ifn in $interfaces; do
9 config_get iftype "$ifn" type
10 config_get iface "$ifn" ifname
11 case "$iftype" in
12 bridge) config_get ifaces "$ifn" ifnames;;
13 esac
14 config_get device "$ifn" device
15 for ifc in $device $iface $ifaces; do
16 [ ."$ifc" = ."$1" ] && {
17 echo "$ifn"
18 return 0
19 }
20 done
21 done
22
23 return 1;
24 }
25
26 scan_interfaces() {
27 local cfgfile="$1"
28 local mode iftype iface ifname device
29 interfaces=
30 config_cb() {
31 case "$1" in
32 interface)
33 config_set "$2" auto 1
34 ;;
35 esac
36 config_get iftype "$CONFIG_SECTION" TYPE
37 case "$iftype" in
38 interface)
39 config_get proto "$CONFIG_SECTION" proto
40 append interfaces "$CONFIG_SECTION"
41 config_get iftype "$CONFIG_SECTION" type
42 config_get ifname "$CONFIG_SECTION" ifname
43 config_set "$CONFIG_SECTION" device "$ifname"
44 case "$iftype" in
45 bridge)
46 config_set "$CONFIG_SECTION" ifnames "$ifname"
47 config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
48 ;;
49 esac
50 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
51 ;;
52 esac
53 }
54 config_load "${cfgfile:-network}"
55 }
56
57 add_vlan() {
58 local vif="${1%\.*}"
59
60 [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
61 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
62 $DEBUG vconfig add "$vif" "${1##*\.}"
63 }
64 }
65
66 # Create the interface, if necessary.
67 # Return status 0 indicates that the setup_interface() call should continue
68 # Return status 1 means that everything is set up already.
69
70 prepare_interface() {
71 local iface="$1"
72 local config="$2"
73
74 # if we're called for the bridge interface itself, don't bother trying
75 # to create any interfaces here. The scripts have already done that, otherwise
76 # the bridge interface wouldn't exist.
77 [ "br-$config" = "$iface" -o -f "$iface" ] && return 0;
78
79 ifconfig "$iface" 2>/dev/null >/dev/null && {
80 # make sure the interface is removed from any existing bridge and brought down
81 ifconfig "$iface" down
82 unbridge "$iface"
83 }
84
85 # Setup VLAN interfaces
86 add_vlan "$iface"
87 ifconfig "$iface" 2>/dev/null >/dev/null || return 0
88
89 # Setup bridging
90 config_get iftype "$config" type
91 case "$iftype" in
92 bridge)
93 [ -x /usr/sbin/brctl ] && {
94 ifconfig "br-$config" 2>/dev/null >/dev/null && {
95 $DEBUG brctl addif "br-$config" "$iface"
96 # Bridge existed already. No further processing necesary
97 } || {
98 $DEBUG brctl addbr "br-$config"
99 $DEBUG brctl setfd "br-$config" 0
100 $DEBUG ifconfig "br-$config" up
101 $DEBUG brctl addif "br-$config" "$iface"
102 # Creating the bridge here will have triggered a hotplug event, which will
103 # result in another setup_interface() call, so we simply stop processing
104 # the current event at this point.
105 }
106 ifconfig "$iface" up 2>/dev/null >/dev/null
107 return 1
108 }
109 ;;
110 esac
111 return 0
112 }
113
114 setup_interface() {
115 local iface="$1"
116 local config="$2"
117 local proto
118 local macaddr
119
120 [ -n "$config" ] || {
121 config=$(find_config "$iface")
122 [ "$?" = 0 ] || return 1
123 }
124 proto="${3:-$(config_get "$config" proto)}"
125
126 prepare_interface "$iface" "$config" || return 0
127
128 [ "$iface" = "br-$config" ] && {
129 # need to bring up the bridge and wait a second for
130 # it to switch to the 'forwarding' state, otherwise
131 # it will lose its routes...
132 ifconfig "$iface" up
133 sleep 1
134 }
135
136 # Interface settings
137 config_get mtu "$config" mtu
138 config_get macaddr "$config" macaddr
139 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
140 uci set "/var/state/network.$config.ifname=$iface"
141
142 pidfile="/var/run/$iface.pid"
143 case "$proto" in
144 static)
145 config_get ipaddr "$config" ipaddr
146 config_get netmask "$config" netmask
147 [ -z "$ipaddr" -o -z "$netmask" ] && return 1
148
149 config_get ip6addr "$config" ip6addr
150 config_get gateway "$config" gateway
151 config_get dns "$config" dns
152 config_get bcast "$config" broadcast
153
154 [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
155 [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
156 [ -z "$gateway" ] || $DEBUG route add default gw "$gateway"
157 [ -z "$dns" ] || {
158 for ns in $dns; do
159 grep "$ns" /tmp/resolv.conf.auto 2>/dev/null >/dev/null || {
160 echo "nameserver $ns" >> /tmp/resolv.conf.auto
161 }
162 done
163 }
164
165 env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
166 ;;
167 dhcp)
168 # prevent udhcpc from starting more than once
169 lock "/var/lock/dhcp-$iface"
170 pid="$(cat "$pidfile" 2>/dev/null)"
171 [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null && {
172 lock -u "/var/lock/dhcp-$iface"
173 return 0
174 }
175
176 config_get ipaddr "$config" ipaddr
177 config_get netmask "$config" netmask
178 config_get hostname "$config" hostname
179 config_get proto1 "$config" proto
180
181 [ -z "$ipaddr" ] || \
182 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
183
184 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
185 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
186 $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} -b -p "$pidfile" ${dhcpopts:- -R &}
187 lock -u "/var/lock/dhcp-$iface"
188 ;;
189 *)
190 if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
191 eval "setup_interface_$proto '$iface' '$config' '$proto'"
192 else
193 echo "Interface type $proto not supported."
194 return 1
195 fi
196 ;;
197 esac
198 }
199
200 unbridge() {
201 local dev="$1"
202 local brdev
203
204 [ -x /usr/sbin/brctl ] || return 0
205 brctl show | grep "$dev" >/dev/null && {
206 # interface is still part of a bridge, correct that
207
208 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
209 brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
210 done
211 }
212 }