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="$1"; shift
  72
  73         local dns
  74         local add
  75         for dns in "$@"; do
  76                 grep -qsF "nameserver $dns" /tmp/resolv.conf.auto || {
  77                         add="${add:+$add }$dns"
  78                         echo "nameserver $dns" >> /tmp/resolv.conf.auto
  79                 }
  80         done
  81
  82         uci_set_state network "$cfg" dns "$add"
  83 }
  84
  85 # remove dns entries of the given iface
  86 remove_dns() {
  87         local cfg="$1"
  88
  89         local dns
  90         config_get dns "$cfg" dns
  91         for dns in $dns; do
  92                 sed -i -e "/^nameserver $dns$/d" /tmp/resolv.conf.auto
  93         done
  94
  95         uci_revert_state network "$cfg" dns
  96 }
  97
  98 # sort the device list, drop duplicates
  99 sort_list() {
 100         local arg="$*"
 101         (
 102                 for item in $arg; do
 103                         echo "$item"
 104                 done
 105         ) | sort -u
 106 }
 107
 108 # Create the interface, if necessary.
 109 # Return status 0 indicates that the setup_interface() call should continue
 110 # Return status 1 means that everything is set up already.
 111
 112 prepare_interface() {
 113         local iface="$1"
 114         local config="$2"
 115         local vifmac="$3"
 116
 117         # if we're called for the bridge interface itself, don't bother trying
 118         # to create any interfaces here. The scripts have already done that, otherwise
 119         # the bridge interface wouldn't exist.
 120         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
 121
 122         ifconfig "$iface" 2>/dev/null >/dev/null && {
 123                 local proto
 124                 config_get proto "$config" proto
 125
 126                 # make sure the interface is removed from any existing bridge and deconfigured,
 127                 # (deconfigured only if the interface is not set to proto=none)
 128                 unbridge "$iface"
 129                 [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
 130
 131                 # Change interface MAC address if requested
 132                 [ -n "$vifmac" ] && {
 133                         ifconfig "$iface" down
 134                         ifconfig "$iface" hw ether "$vifmac" up
 135                 }
 136         }
 137
 138         # Setup VLAN interfaces
 139         add_vlan "$iface" && return 1
 140         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 141
 142         # Setup bridging
 143         local iftype
 144         config_get iftype "$config" type
 145         case "$iftype" in
 146                 bridge)
 147                         [ -x /usr/sbin/brctl ] && {
 148                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 149                                         local newdevs devices
 150                                         config_get devices "$config" device
 151                                         for dev in $(sort_list "$devices" "$iface"); do
 152                                                 append newdevs "$dev"
 153                                         done
 154                                         uci_set_state network "$config" device "$newdevs"
 155                                         $DEBUG ifconfig "$iface" 0.0.0.0
 156                                         $DEBUG brctl addif "br-$config" "$iface"
 157                                         # Bridge existed already. No further processing necesary
 158                                 } || {
 159                                         local stp
 160                                         config_get_bool stp "$config" stp 0
 161                                         $DEBUG brctl addbr "br-$config"
 162                                         $DEBUG brctl setfd "br-$config" 0
 163                                         $DEBUG ifconfig "br-$config" up
 164                                         $DEBUG ifconfig "$iface" 0.0.0.0
 165                                         $DEBUG brctl addif "br-$config" "$iface"
 166                                         $DEBUG brctl stp "br-$config" $stp
 167                                         # Creating the bridge here will have triggered a hotplug event, which will
 168                                         # result in another setup_interface() call, so we simply stop processing
 169                                         # the current event at this point.
 170                                 }
 171                                 ifconfig "$iface" up 2>/dev/null >/dev/null
 172                                 return 1
 173                         }
 174                 ;;
 175         esac
 176         return 0
 177 }
 178
 179 set_interface_ifname() {
 180         local config="$1"
 181         local ifname="$2"
 182
 183         local device
 184         config_get device "$1" device
 185         uci_set_state network "$config" ifname "$ifname"
 186         uci_set_state network "$config" device "$device"
 187 }
 188
 189 setup_interface_none() {
 190         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 191 }
 192
 193 setup_interface_static() {
 194         local iface="$1"
 195         local config="$2"
 196
 197         local ipaddr netmask ip6addr
 198         config_get ipaddr "$config" ipaddr
 199         config_get netmask "$config" netmask
 200         config_get ip6addr "$config" ip6addr
 201         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 202
 203         local gateway ip6gw dns bcast
 204         config_get gateway "$config" gateway
 205         config_get ip6gw "$config" ip6gw
 206         config_get dns "$config" dns
 207         config_get bcast "$config" broadcast
 208
 209         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 210         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 211         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" dev "$iface"
 212         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" dev "$iface"
 213         [ -z "$dns" ] || {
 214                 for ns in $dns; do
 215                         grep "$ns" /tmp/resolv.conf.auto 2>/dev/null >/dev/null || {
 216                                 echo "nameserver $ns" >> /tmp/resolv.conf.auto
 217                         }
 218                 done
 219         }
 220
 221         config_get type "$config" TYPE
 222         [ "$type" = "alias" ] && return 0
 223
 224         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 225 }
 226
 227 setup_interface_alias() {
 228         local config="$1"
 229         local parent="$2"
 230         local iface="$3"
 231
 232         local cfg
 233         config_get cfg "$config" interface
 234         [ "$parent" == "$cfg" ] || return 0
 235
 236         # alias counter
 237         local ctr
 238         config_get ctr "$parent" alias_count 0
 239         ctr="$(($ctr + 1))"
 240         config_set "$parent" alias_count "$ctr"
 241
 242         # alias list
 243         local list
 244         config_get list "$parent" aliases
 245         append list "$config"
 246         config_set "$parent" aliases "$list"
 247
 248         iface="$iface:$ctr"
 249         set_interface_ifname "$config" "$iface"
 250
 251         local proto
 252         config_get proto "$config" proto "static"
 253         case "${proto}" in
 254                 static)
 255                         setup_interface_static "$iface" "$config"
 256                 ;;
 257                 *)
 258                         echo "Unsupported type '$proto' for alias config '$config'"
 259                         return 1
 260                 ;;
 261         esac
 262 }
 263
 264 setup_interface() {
 265         local iface_main="$1"
 266         local config="$2"
 267         local proto="$3"
 268         local vifmac="$4"
 269         local ip6addr_main=
 270
 271         [ -n "$config" ] || {
 272                 config=$(find_config "$iface_main")
 273                 [ "$?" = 0 ] || return 1
 274         }
 275
 276         prepare_interface "$iface_main" "$config" "$vifmac" || return 0
 277
 278         [ "$iface_main" = "br-$config" ] && {
 279                 # need to bring up the bridge and wait a second for
 280                 # it to switch to the 'forwarding' state, otherwise
 281                 # it will lose its routes...
 282                 ifconfig "$iface_main" up
 283                 sleep 1
 284         }
 285
 286         # Interface settings
 287         grep "$iface_main:" /proc/net/dev > /dev/null && {
 288                 local mtu macaddr
 289                 config_get mtu "$config" mtu
 290                 config_get macaddr "$config" macaddr
 291                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface_main" down
 292                 $DEBUG ifconfig "$iface_main" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 293         }
 294         set_interface_ifname "$config" "$iface_main"
 295
 296         [ -n "$proto" ] || config_get proto "$config" proto
 297         case "$proto" in
 298                 static)
 299                         config_get ip6addr_main "$config" ip6addr
 300                         setup_interface_static "$iface_main" "$config"
 301                 ;;
 302                 dhcp)
 303                         local lockfile="/var/lock/dhcp-$iface_main"
 304                         lock "$lockfile"
 305
 306                         # prevent udhcpc from starting more than once
 307                         local pidfile="/var/run/dhcp-${iface_main}.pid"
 308                         local pid="$(cat "$pidfile" 2>/dev/null)"
 309                         if [ -d "/proc/$pid" ] && grep -qs udhcpc "/proc/${pid}/cmdline"; then
 310                                 lock -u "$lockfile"
 311                         else
 312                                 local ipaddr netmask hostname proto1 clientid
 313                                 config_get ipaddr "$config" ipaddr
 314                                 config_get netmask "$config" netmask
 315                                 config_get hostname "$config" hostname
 316                                 config_get proto1 "$config" proto
 317                                 config_get clientid "$config" clientid
 318
 319                                 [ -z "$ipaddr" ] || \
 320                                         $DEBUG ifconfig "$iface_main" "$ipaddr" ${netmask:+netmask "$netmask"}
 321
 322                                 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 323                                 local dhcpopts
 324                                 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 325                                 $DEBUG eval udhcpc -t 0 -i "$iface_main" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} ${clientid:+-c $clientid} -b -p "$pidfile" ${dhcpopts:- -O rootpath -R &}
 326                                 lock -u "$lockfile"
 327                         fi
 328                 ;;
 329                 none)
 330                         setup_interface_none "$iface_main" "$config"
 331                 ;;
 332                 *)
 333                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 334                                 eval "setup_interface_$proto '$iface_main' '$config' '$proto'"
 335                         else
 336                                 echo "Interface type $proto not supported."
 337                                 return 1
 338                         fi
 339                 ;;
 340         esac
 341         [ "$proto" = none ] || {
 342                 for ifn in `ifconfig | grep "^$iface_main:" | awk '{print $1}'`; do
 343                         ifconfig "$ifn" down
 344                 done
 345         }
 346
 347         local aliases
 348         config_set "$config" aliases ""
 349         config_set "$config" alias_count 0
 350         config_foreach setup_interface_alias alias "$config" "$iface_main"
 351         config_get aliases "$config" aliases
 352         [ -z "$aliases" ] || uci_set_state network "$config" aliases "$aliases"
 353
 354         # put the ip6addr back to the beginning to become the main ip again
 355         [ -z "$ip6addr_main" ] || {
 356                 $DEBUG ifconfig "$iface_main" del "$ip6addr_main"
 357                 $DEBUG ifconfig "$iface_main" add "$ip6addr_main"
 358         }
 359 }
 360
 361 stop_interface_dhcp() {
 362         local config="$1"
 363
 364         local iface
 365         config_get ifname "$config" ifname
 366
 367         local lock="/var/lock/dhcp-${ifname}"
 368         [ -f "$lock" ] && lock -u "$lock"
 369
 370         local pidfile="/var/run/dhcp-${ifname}.pid"
 371         local pid="$(cat "$pidfile" 2>/dev/null)"
 372         [ -d "/proc/$pid" ] && {
 373                 grep -qs udhcpc "/proc/$pid/cmdline" && kill -TERM $pid && \
 374                         while grep -qs udhcpc "/proc/$pid/cmdline"; do sleep 1; done
 375                 rm -f "$pidfile"
 376         }
 377
 378         uci -P /var/state revert "network.$config"
 379 }
 380
 381 unbridge() {
 382         local dev="$1"
 383         local brdev
 384
 385         [ -x /usr/sbin/brctl ] || return 0
 386         brctl show 2>/dev/null | grep "$dev" >/dev/null && {
 387                 # interface is still part of a bridge, correct that
 388
 389                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 390                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 391                 done
 392         }
 393 }