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                                         $DEBUG brctl addif "br-$config" "$iface"
 176                                         # Bridge existed already. No further processing necesary
 177                                 } || {
 178                                         local stp
 179                                         config_get_bool stp "$config" stp 0
 180                                         $DEBUG brctl addbr "br-$config"
 181                                         $DEBUG brctl setfd "br-$config" 0
 182                                         $DEBUG ifconfig "br-$config" up
 183                                         $DEBUG ifconfig "$iface" 0.0.0.0
 184                                         $DEBUG brctl addif "br-$config" "$iface"
 185                                         $DEBUG brctl stp "br-$config" $stp
 186                                         # Creating the bridge here will have triggered a hotplug event, which will
 187                                         # result in another setup_interface() call, so we simply stop processing
 188                                         # the current event at this point.
 189                                 }
 190                                 ifconfig "$iface" ${macaddr:+hw ether "${macaddr}"} up 2>/dev/null >/dev/null
 191                                 return 1
 192                         }
 193                 ;;
 194         esac
 195         return 0
 196 }
 197
 198 set_interface_ifname() {
 199         local config="$1"
 200         local ifname="$2"
 201
 202         local device
 203         config_get device "$1" device
 204         uci_set_state network "$config" ifname "$ifname"
 205         uci_set_state network "$config" device "$device"
 206 }
 207
 208 setup_interface_none() {
 209         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 210 }
 211
 212 setup_interface_static() {
 213         local iface="$1"
 214         local config="$2"
 215
 216         local ipaddr netmask ip6addr
 217         config_get ipaddr "$config" ipaddr
 218         config_get netmask "$config" netmask
 219         config_get ip6addr "$config" ip6addr
 220         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 221
 222         local gateway ip6gw dns bcast
 223         config_get gateway "$config" gateway
 224         config_get ip6gw "$config" ip6gw
 225         config_get dns "$config" dns
 226         config_get bcast "$config" broadcast
 227
 228         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 229         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 230         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" dev "$iface"
 231         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" dev "$iface"
 232         [ -z "$dns" ] || add_dns "$config" $dns
 233
 234         config_get type "$config" TYPE
 235         [ "$type" = "alias" ] && return 0
 236
 237         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 238 }
 239
 240 setup_interface_alias() {
 241         local config="$1"
 242         local parent="$2"
 243         local iface="$3"
 244
 245         local cfg
 246         config_get cfg "$config" interface
 247         [ "$parent" == "$cfg" ] || return 0
 248
 249         # alias counter
 250         local ctr
 251         config_get ctr "$parent" alias_count 0
 252         ctr="$(($ctr + 1))"
 253         config_set "$parent" alias_count "$ctr"
 254
 255         # alias list
 256         local list
 257         config_get list "$parent" aliases
 258         append list "$config"
 259         config_set "$parent" aliases "$list"
 260
 261         iface="$iface:$ctr"
 262         set_interface_ifname "$config" "$iface"
 263
 264         local proto
 265         config_get proto "$config" proto "static"
 266         case "${proto}" in
 267                 static)
 268                         setup_interface_static "$iface" "$config"
 269                 ;;
 270                 *)
 271                         echo "Unsupported type '$proto' for alias config '$config'"
 272                         return 1
 273                 ;;
 274         esac
 275 }
 276
 277 setup_interface() {
 278         local iface="$1"
 279         local config="$2"
 280         local proto="$3"
 281         local vifmac="$4"
 282
 283         [ -n "$config" ] || {
 284                 config=$(find_config "$iface")
 285                 [ "$?" = 0 ] || return 1
 286         }
 287
 288         prepare_interface "$iface" "$config" "$vifmac" || return 0
 289
 290         [ "$iface" = "br-$config" ] && {
 291                 # need to bring up the bridge and wait a second for
 292                 # it to switch to the 'forwarding' state, otherwise
 293                 # it will lose its routes...
 294                 ifconfig "$iface" up
 295                 sleep 1
 296         }
 297
 298         # Interface settings
 299         grep "$iface:" /proc/net/dev > /dev/null && {
 300                 local mtu macaddr
 301                 config_get mtu "$config" mtu
 302                 config_get macaddr "$config" macaddr
 303                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
 304                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 305         }
 306         set_interface_ifname "$config" "$iface"
 307
 308         [ -n "$proto" ] || config_get proto "$config" proto
 309         case "$proto" in
 310                 static)
 311                         setup_interface_static "$iface" "$config"
 312                 ;;
 313                 dhcp)
 314                         local lockfile="/var/lock/dhcp-$iface"
 315                         lock "$lockfile"
 316
 317                         # prevent udhcpc from starting more than once
 318                         local pidfile="/var/run/dhcp-${iface}.pid"
 319                         local pid="$(cat "$pidfile" 2>/dev/null)"
 320                         if [ -d "/proc/$pid" ] && grep -qs udhcpc "/proc/${pid}/cmdline"; then
 321                                 lock -u "$lockfile"
 322                         else
 323                                 local ipaddr netmask hostname proto1 clientid
 324                                 config_get ipaddr "$config" ipaddr
 325                                 config_get netmask "$config" netmask
 326                                 config_get hostname "$config" hostname
 327                                 config_get proto1 "$config" proto
 328                                 config_get clientid "$config" clientid
 329
 330                                 [ -z "$ipaddr" ] || \
 331                                         $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 332
 333                                 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 334                                 local dhcpopts
 335                                 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 336                                 $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} ${clientid:+-c $clientid} -b -p "$pidfile" ${dhcpopts:- -O rootpath -R &}
 337                                 lock -u "$lockfile"
 338                         fi
 339                 ;;
 340                 none)
 341                         setup_interface_none "$iface" "$config"
 342                 ;;
 343                 *)
 344                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 345                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 346                         else
 347                                 echo "Interface type $proto not supported."
 348                                 return 1
 349                         fi
 350                 ;;
 351         esac
 352 }
 353
 354 stop_interface_dhcp() {
 355         local config="$1"
 356
 357         local ifname
 358         config_get ifname "$config" ifname
 359
 360         local lock="/var/lock/dhcp-${ifname}"
 361         [ -f "$lock" ] && lock -u "$lock"
 362
 363         remove_dns "$config"
 364
 365         local pidfile="/var/run/dhcp-${ifname}.pid"
 366         local pid="$(cat "$pidfile" 2>/dev/null)"
 367         [ -d "/proc/$pid" ] && {
 368                 grep -qs udhcpc "/proc/$pid/cmdline" && kill -TERM $pid && \
 369                         while grep -qs udhcpc "/proc/$pid/cmdline"; do sleep 1; done
 370                 rm -f "$pidfile"
 371         }
 372
 373         uci -P /var/state revert "network.$config"
 374 }
 375
 376 unbridge() {
 377         local dev="$1"
 378         local brdev
 379
 380         [ -x /usr/sbin/brctl ] || return 0
 381         brctl show 2>/dev/null | grep "$dev" >/dev/null && {
 382                 # interface is still part of a bridge, correct that
 383
 384                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 385                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 386                 done
 387         }
 388 }