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 "$CONFIG_SECTION" ifname
  43                                 config_get device "$CONFIG_SECTION" device
  44                                 config_set "$CONFIG_SECTION" device "${device:-$ifname}"
  45                                 case "$iftype" in
  46                                         bridge)
  47                                                 config_set "$CONFIG_SECTION" ifnames "${device:-$ifname}"
  48                                                 config_set "$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 "${cfgfile:-network}"
  56 }
  57
  58 add_vlan() {
  59         local vif="${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" "${1##*\.}"
  64                 return 0
  65         }
  66         return 1
  67 }
  68
  69 # sort the device list, drop duplicates
  70 sort_list() {
  71         local arg="$*"
  72         (
  73                 for item in $arg; do
  74                         echo "$item"
  75                 done
  76         ) | sort -u
  77 }
  78
  79 # Create the interface, if necessary.
  80 # Return status 0 indicates that the setup_interface() call should continue
  81 # Return status 1 means that everything is set up already.
  82
  83 prepare_interface() {
  84         local iface="$1"
  85         local config="$2"
  86         local vifmac="$3"
  87         local proto
  88
  89         # if we're called for the bridge interface itself, don't bother trying
  90         # to create any interfaces here. The scripts have already done that, otherwise
  91         # the bridge interface wouldn't exist.
  92         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
  93
  94         ifconfig "$iface" 2>/dev/null >/dev/null && {
  95                 config_get proto "$config" proto
  96
  97                 # make sure the interface is removed from any existing bridge and deconfigured,
  98                 # (deconfigured only if the interface is not set to proto=none)
  99                 unbridge "$iface"
 100                 [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
 101
 102                 # Change interface MAC address if requested
 103                 [ -n "$vifmac" ] && {
 104                         ifconfig "$iface" down
 105                         ifconfig "$iface" hw ether "$vifmac" up
 106                 }
 107         }
 108
 109         # Setup VLAN interfaces
 110         add_vlan "$iface" && return 1
 111         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 112
 113         # Setup bridging
 114         config_get iftype "$config" type
 115         config_get stp "$config" stp
 116         case "$iftype" in
 117                 bridge)
 118                         [ -x /usr/sbin/brctl ] && {
 119                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 120                                         local newdevs=
 121
 122                                         config_get devices "$config" device
 123                                         for dev in $(sort_list "$devices" "$iface"); do
 124                                                 append newdevs "$dev"
 125                                         done
 126                                         uci_set_state network "$config" device "$newdevs"
 127                                         $DEBUG brctl addif "br-$config" "$iface"
 128                                         # Bridge existed already. No further processing necesary
 129                                 } || {
 130                                         $DEBUG brctl addbr "br-$config"
 131                                         $DEBUG brctl setfd "br-$config" 0
 132                                         $DEBUG ifconfig "br-$config" up
 133                                         $DEBUG brctl addif "br-$config" "$iface"
 134                                         $DEBUG brctl stp "br-$config" ${stp:-off}
 135                                         # Creating the bridge here will have triggered a hotplug event, which will
 136                                         # result in another setup_interface() call, so we simply stop processing
 137                                         # the current event at this point.
 138                                 }
 139                                 ifconfig "$iface" up 2>/dev/null >/dev/null
 140                                 return 1
 141                         }
 142                 ;;
 143         esac
 144         return 0
 145 }
 146
 147 set_interface_ifname() {
 148         local config="$1"
 149         local ifname="$2"
 150
 151         config_get device "$1" device
 152         uci_set_state network "$config" ifname "$ifname"
 153         uci_set_state network "$config" device "$device"
 154 }
 155
 156 setup_interface_none() {
 157         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 158 }
 159
 160 setup_interface_static() {
 161         local iface="$1"
 162         local config="$2"
 163
 164         config_get ipaddr "$config" ipaddr
 165         config_get netmask "$config" netmask
 166         config_get ip6addr "$config" ip6addr
 167         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 168
 169         config_get gateway "$config" gateway
 170         config_get ip6gw "$config" ip6gw
 171         config_get dns "$config" dns
 172         config_get bcast "$config" broadcast
 173
 174         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 175         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 176         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" dev "$iface"
 177         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" dev "$iface"
 178         [ -z "$dns" ] || {
 179                 for ns in $dns; do
 180                         grep "$ns" /tmp/resolv.conf.auto 2>/dev/null >/dev/null || {
 181                                 echo "nameserver $ns" >> /tmp/resolv.conf.auto
 182                         }
 183                 done
 184         }
 185
 186         config_get type "$config" TYPE
 187         [ "$type" = "alias" ] && return 0
 188
 189         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 190 }
 191
 192 setup_interface_alias() {
 193         local config="$1"
 194         local parent="$2"
 195         local iface="$3"
 196
 197         config_get cfg "$config" interface
 198         [ "$parent" == "$cfg" ] || return 0
 199
 200         # alias counter
 201         config_get ctr "$parent" alias_count
 202         ctr="$(($ctr + 1))"
 203         config_set "$parent" alias_count "$ctr"
 204
 205         # alias list
 206         config_get list "$parent" aliases
 207         append list "$config"
 208         config_set "$parent" aliases "$list"
 209
 210         set_interface_ifname "$config" "$iface:$ctr"
 211         config_get proto "$config" proto
 212         case "${proto:-static}" in
 213                 static)
 214                         setup_interface_static "$iface:$ctr" "$config"
 215                 ;;
 216                 *)
 217                         echo "Unsupported type '$proto' for alias config '$config'"
 218                         return 1
 219                 ;;
 220         esac
 221 }
 222
 223 setup_interface() {
 224         local iface="$1"
 225         local config="$2"
 226         local vifmac="$4"
 227         local proto
 228         local macaddr
 229         local hasipv6
 230
 231         [ -n "$config" ] || {
 232                 config=$(find_config "$iface")
 233                 [ "$?" = 0 ] || return 1
 234         }
 235         proto="${3:-$(config_get "$config" proto)}"
 236
 237         prepare_interface "$iface" "$config" "$vifmac" || return 0
 238
 239         [ "$iface" = "br-$config" ] && {
 240                 # need to bring up the bridge and wait a second for
 241                 # it to switch to the 'forwarding' state, otherwise
 242                 # it will lose its routes...
 243                 ifconfig "$iface" up
 244                 sleep 1
 245         }
 246
 247         # Check whether this interface has an IPv6 address
 248         # defined and ensure that the kmod is loaded since
 249         # ifup could be triggered before modules are loaded.
 250         config_get hasipv6 "$config" ip6addr
 251         [ -n "$hasipv6" ] && [ ! -d /proc/sys/net/ipv6 ] && {
 252                 grep -q '^ipv6' /etc/modules.d/* && insmod ipv6
 253         }
 254
 255         # Interface settings
 256         config_get mtu "$config" mtu
 257         config_get macaddr "$config" macaddr
 258         grep "$iface:" /proc/net/dev > /dev/null && {
 259                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
 260                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 261         }
 262         set_interface_ifname "$config" "$iface"
 263
 264         pidfile="/var/run/$iface.pid"
 265         case "$proto" in
 266                 static)
 267                         setup_interface_static "$iface" "$config"
 268                 ;;
 269                 dhcp)
 270                         # prevent udhcpc from starting more than once
 271                         lock "/var/lock/dhcp-$iface"
 272                         pid="$(cat "$pidfile" 2>/dev/null)"
 273                         if [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null; then
 274                                 lock -u "/var/lock/dhcp-$iface"
 275                         else
 276
 277                                 config_get ipaddr "$config" ipaddr
 278                                 config_get netmask "$config" netmask
 279                                 config_get hostname "$config" hostname
 280                                 config_get proto1 "$config" proto
 281                                 config_get clientid "$config" clientid
 282
 283                                 [ -z "$ipaddr" ] || \
 284                                         $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 285
 286                                 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 287                                 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 288                                 $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} ${clientid:+-c $clientid} -b -p "$pidfile" ${dhcpopts:- -R &}
 289                                 lock -u "/var/lock/dhcp-$iface"
 290                         fi
 291                 ;;
 292                 none)
 293                         setup_interface_none "$iface" "$config"
 294                 ;;
 295                 *)
 296                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 297                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 298                         else
 299                                 echo "Interface type $proto not supported."
 300                                 return 1
 301                         fi
 302                 ;;
 303         esac
 304         [ "$proto" = none ] || {
 305                 for ifn in `ifconfig | grep "^$iface:" | awk '{print $1}'`; do
 306                         ifconfig "$ifn" down
 307                 done
 308         }
 309         config_set "$config" aliases ""
 310         config_set "$config" alias_count 0
 311         config_foreach setup_interface_alias alias "$config" "$iface"
 312         config_get aliases "$config" aliases
 313         [ -z "$aliases" ] || uci_set_state network "$config" aliases "$aliases"
 314 }
 315
 316 unbridge() {
 317         local dev="$1"
 318         local brdev
 319
 320         [ -x /usr/sbin/brctl ] || return 0
 321         brctl show | grep "$dev" >/dev/null && {
 322                 # interface is still part of a bridge, correct that
 323
 324                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 325                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 326                 done
 327         }
 328 }