[backfire] backport r25454
[openwrt-10.03/.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:-network}"
28         interfaces=
29         config_cb() {
30                 case "$1" in
31                         interface)
32                                 config_set "$2" auto 1
33                         ;;
34                 esac
35                 local iftype ifname device proto
36                 config_get iftype "$CONFIG_SECTION" TYPE
37                 case "$iftype" in
38                         interface)
39                                 append interfaces "$CONFIG_SECTION"
40                                 config_get proto "$CONFIG_SECTION" proto
41                                 config_get iftype "$CONFIG_SECTION" type
42                                 config_get ifname "$CONFIG_SECTION" ifname
43                                 config_get device "$CONFIG_SECTION" device "$ifname"
44                                 config_set "$CONFIG_SECTION" device "$device"
45                                 case "$iftype" in
46                                         bridge)
47                                                 config_set "$CONFIG_SECTION" ifnames "$device"
48                                                 config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
49                                         ;;
50                                 esac
51                                 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
52                         ;;
53                 esac
54         }
55         config_load "${cfgfile}"
56 }
57
58 add_vlan() {
59         local vif="${1%\.*}"
60
61         [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
62                 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
63                 $DEBUG vconfig add "$vif" "${1##*\.}"
64                 return 0
65         }
66         return 1
67 }
68
69 # add dns entries if they are not in resolv.conf yet
70 add_dns() {
71         local cfg="$1"; shift
72
73         remove_dns "$cfg"
74
75         # We may be called by pppd's ip-up which has a nonstandard umask set.
76         # Create an empty file here and force its permission to 0644, otherwise
77         # dnsmasq will not be able to re-read the resolv.conf.auto .
78         [ ! -f /tmp/resolv.conf.auto ] && {
79                 touch /tmp/resolv.conf.auto
80                 chmod 0644 /tmp/resolv.conf.auto
81         }
82
83         local dns
84         local add
85         for dns in "$@"; do
86                 grep -qsF "nameserver $dns" /tmp/resolv.conf.auto || {
87                         add="${add:+$add }$dns"
88                         echo "nameserver $dns" >> /tmp/resolv.conf.auto
89                 }
90         done
91
92         [ -n "$cfg" ] && {
93                 uci_set_state network "$cfg" dns "$add"
94                 uci_set_state network "$cfg" resolv_dns "$add"
95         }
96 }
97
98 # remove dns entries of the given iface
99 remove_dns() {
100         local cfg="$1"
101
102         [ -n "$cfg" ] && {
103                 [ -f /tmp/resolv.conf.auto ] && {
104                         local dns=$(uci_get_state network "$cfg" resolv_dns)
105                         for dns in $dns; do
106                                 sed -i -e "/^nameserver $dns$/d" /tmp/resolv.conf.auto
107                         done
108                 }
109
110                 uci_revert_state network "$cfg" dns
111                 uci_revert_state network "$cfg" resolv_dns
112         }
113 }
114
115 # sort the device list, drop duplicates
116 sort_list() {
117         local arg="$*"
118         (
119                 for item in $arg; do
120                         echo "$item"
121                 done
122         ) | sort -u
123 }
124
125 # Create the interface, if necessary.
126 # Return status 0 indicates that the setup_interface() call should continue
127 # Return status 1 means that everything is set up already.
128
129 prepare_interface() {
130         local iface="$1"
131         local config="$2"
132         local vifmac="$3"
133
134         # if we're called for the bridge interface itself, don't bother trying
135         # to create any interfaces here. The scripts have already done that, otherwise
136         # the bridge interface wouldn't exist.
137         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
138
139         ifconfig "$iface" 2>/dev/null >/dev/null && {
140                 local proto
141                 config_get proto "$config" proto
142
143                 # make sure the interface is removed from any existing bridge and deconfigured,
144                 # (deconfigured only if the interface is not set to proto=none)
145                 unbridge "$iface"
146                 [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
147
148                 # Change interface MAC address if requested
149                 [ -n "$vifmac" ] && {
150                         ifconfig "$iface" down
151                         ifconfig "$iface" hw ether "$vifmac" up
152                 }
153         }
154
155         # Setup VLAN interfaces
156         add_vlan "$iface" && return 1
157         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
158
159         # Setup bridging
160         local iftype
161         config_get iftype "$config" type
162         case "$iftype" in
163                 bridge)
164                         local macaddr
165                         config_get macaddr "$config" macaddr
166                         [ -x /usr/sbin/brctl ] && {
167                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
168                                         local newdevs devices
169                                         config_get devices "$config" device
170                                         for dev in $(sort_list "$devices" "$iface"); do
171                                                 append newdevs "$dev"
172                                         done
173                                         uci_set_state network "$config" device "$newdevs"
174                                         $DEBUG ifconfig "$iface" 0.0.0.0
175                                         $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
176                                         $DEBUG brctl addif "br-$config" "$iface"
177                                         # Bridge existed already. No further processing necesary
178                                 } || {
179                                         local stp
180                                         config_get_bool stp "$config" stp 0
181                                         $DEBUG brctl addbr "br-$config"
182                                         $DEBUG brctl setfd "br-$config" 0
183                                         $DEBUG ifconfig "br-$config" up
184                                         $DEBUG ifconfig "$iface" 0.0.0.0
185                                         $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
186                                         $DEBUG brctl addif "br-$config" "$iface"
187                                         $DEBUG brctl stp "br-$config" $stp
188                                         # Creating the bridge here will have triggered a hotplug event, which will
189                                         # result in another setup_interface() call, so we simply stop processing
190                                         # the current event at this point.
191                                 }
192                                 ifconfig "$iface" ${macaddr:+hw ether "${macaddr}"} up 2>/dev/null >/dev/null
193                                 return 1
194                         }
195                 ;;
196         esac
197         return 0
198 }
199
200 set_interface_ifname() {
201         local config="$1"
202         local ifname="$2"
203
204         local device
205         config_get device "$1" device
206         uci_set_state network "$config" ifname "$ifname"
207         uci_set_state network "$config" device "$device"
208 }
209
210 setup_interface_none() {
211         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
212 }
213
214 setup_interface_static() {
215         local iface="$1"
216         local config="$2"
217
218         local ipaddr netmask ip6addr
219         config_get ipaddr "$config" ipaddr
220         config_get netmask "$config" netmask
221         config_get ip6addr "$config" ip6addr
222         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
223
224         local gateway ip6gw dns bcast metric
225         config_get gateway "$config" gateway
226         config_get ip6gw "$config" ip6gw
227         config_get dns "$config" dns
228         config_get bcast "$config" broadcast
229         config_get metric "$config" metric
230
231         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
232         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
233         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" ${metric:+metric $metric} dev "$iface"
234         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" ${metric:+metric $metric} dev "$iface"
235         [ -z "$dns" ] || add_dns "$config" $dns
236
237         config_get type "$config" TYPE
238         [ "$type" = "alias" ] && return 0
239
240         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
241 }
242
243 setup_interface_alias() {
244         local config="$1"
245         local parent="$2"
246         local iface="$3"
247
248         local cfg
249         config_get cfg "$config" interface
250         [ "$parent" == "$cfg" ] || return 0
251
252         # parent device and ifname
253         local p_device p_type
254         config_get p_device "$cfg" device
255         config_get p_type   "$cfg" type
256
257         # select alias ifname
258         local layer use_iface
259         config_get layer "$config" layer 2
260         case "$layer:$p_type" in
261                 # layer 3: e.g. pppoe-wan or pptp-vpn
262                 3:*)      use_iface="$iface" ;;
263
264                 # layer 2 and parent is bridge: e.g. br-wan
265                 2:bridge) use_iface="br-$cfg" ;;
266
267                 # layer 1: e.g. eth0 or ath0
268                 *)        use_iface="$p_device" ;;
269         esac
270
271         # alias counter
272         local ctr
273         config_get ctr "$parent" alias_count 0
274         ctr="$(($ctr + 1))"
275         config_set "$parent" alias_count "$ctr"
276
277         # alias list
278         local list
279         config_get list "$parent" aliases
280         append list "$config"
281         config_set "$parent" aliases "$list"
282
283         use_iface="$use_iface:$ctr"
284         set_interface_ifname "$config" "$use_iface"
285
286         local proto
287         config_get proto "$config" proto "static"
288         case "${proto}" in
289                 static)
290                         setup_interface_static "$use_iface" "$config"
291                 ;;
292                 *)
293                         echo "Unsupported type '$proto' for alias config '$config'"
294                         return 1
295                 ;;
296         esac
297 }
298
299 setup_interface() {
300         local iface="$1"
301         local config="$2"
302         local proto="$3"
303         local vifmac="$4"
304
305         [ -n "$config" ] || {
306                 config=$(find_config "$iface")
307                 [ "$?" = 0 ] || return 1
308         }
309
310         prepare_interface "$iface" "$config" "$vifmac" || return 0
311
312         [ "$iface" = "br-$config" ] && {
313                 # need to bring up the bridge and wait a second for
314                 # it to switch to the 'forwarding' state, otherwise
315                 # it will lose its routes...
316                 ifconfig "$iface" up
317                 sleep 1
318         }
319
320         # Interface settings
321         grep "$iface:" /proc/net/dev > /dev/null && {
322                 local mtu macaddr
323                 config_get mtu "$config" mtu
324                 config_get macaddr "$config" macaddr
325                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
326                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
327         }
328         set_interface_ifname "$config" "$iface"
329
330         [ -n "$proto" ] || config_get proto "$config" proto
331         case "$proto" in
332                 static)
333                         setup_interface_static "$iface" "$config"
334                 ;;
335                 dhcp)
336                         # kill running udhcpc instance
337                         local pidfile="/var/run/dhcp-${iface}.pid"
338                         service_kill udhcpc "$pidfile"
339
340                         local ipaddr netmask hostname proto1 clientid vendorid broadcast
341                         config_get ipaddr "$config" ipaddr
342                         config_get netmask "$config" netmask
343                         config_get hostname "$config" hostname
344                         config_get proto1 "$config" proto
345                         config_get clientid "$config" clientid
346                         config_get vendorid "$config" vendorid
347                         config_get_bool broadcast "$config" broadcast 0
348
349                         [ -z "$ipaddr" ] || \
350                                 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
351
352                         # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
353                         local dhcpopts
354                         [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
355                         [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
356
357                         $DEBUG eval udhcpc -t 0 -i "$iface" \
358                                 ${ipaddr:+-r $ipaddr} \
359                                 ${hostname:+-H $hostname} \
360                                 ${clientid:+-c $clientid} \
361                                 ${vendorid:+-V $vendorid} \
362                                 -b -p "$pidfile" $broadcast \
363                                 ${dhcpopts:- -O rootpath -R &}
364                 ;;
365                 none)
366                         setup_interface_none "$iface" "$config"
367                 ;;
368                 *)
369                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
370                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
371                         else
372                                 echo "Interface type $proto not supported."
373                                 return 1
374                         fi
375                 ;;
376         esac
377 }
378
379 stop_interface_dhcp() {
380         local config="$1"
381
382         local ifname
383         config_get ifname "$config" ifname
384
385         local lock="/var/lock/dhcp-${ifname}"
386         [ -f "$lock" ] && lock -u "$lock"
387
388         remove_dns "$config"
389
390         local pidfile="/var/run/dhcp-${ifname}.pid"
391         service_kill udhcpc "$pidfile"
392
393         uci -P /var/state revert "network.$config"
394 }
395
396 unbridge() {
397         local dev="$1"
398         local brdev
399
400         [ -x /usr/sbin/brctl ] || return 0
401         brctl show 2>/dev/null | grep "$dev" >/dev/null && {
402                 # interface is still part of a bridge, correct that
403
404                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
405                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
406                 done
407         }
408 }