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                                 # Remove IPv6 link local addr before adding the iface to the bridge
 168                                 local llv6="$(ifconfig "$iface")"
 169                                 case "$llv6" in
 170                                         *fe80:*/64*)
 171                                                 llv6="${llv6#* fe80:}"
 172                                                 ifconfig "$iface" del "fe80:${llv6%% *}"
 173                                         ;;
 174                                 esac
 175
 176                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 177                                         local newdevs devices
 178                                         config_get devices "$config" device
 179                                         for dev in $(sort_list "$devices" "$iface"); do
 180                                                 append newdevs "$dev"
 181                                         done
 182                                         uci_set_state network "$config" device "$newdevs"
 183                                         $DEBUG ifconfig "$iface" 0.0.0.0
 184                                         $DEBUG brctl addif "br-$config" "$iface"
 185                                         # Bridge existed already. No further processing necesary
 186                                 } || {
 187                                         local stp
 188                                         config_get_bool stp "$config" stp 0
 189                                         $DEBUG brctl addbr "br-$config"
 190                                         $DEBUG brctl setfd "br-$config" 0
 191                                         $DEBUG ifconfig "br-$config" up
 192                                         $DEBUG ifconfig "$iface" 0.0.0.0
 193                                         $DEBUG brctl addif "br-$config" "$iface"
 194                                         $DEBUG brctl stp "br-$config" $stp
 195                                         # Creating the bridge here will have triggered a hotplug event, which will
 196                                         # result in another setup_interface() call, so we simply stop processing
 197                                         # the current event at this point.
 198                                 }
 199                                 ifconfig "$iface" ${macaddr:+hw ether "${macaddr}"} up 2>/dev/null >/dev/null
 200                                 return 1
 201                         }
 202                 ;;
 203         esac
 204         return 0
 205 }
 206
 207 set_interface_ifname() {
 208         local config="$1"
 209         local ifname="$2"
 210
 211         local device
 212         config_get device "$1" device
 213         uci_set_state network "$config" ifname "$ifname"
 214         uci_set_state network "$config" device "$device"
 215 }
 216
 217 setup_interface_none() {
 218         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 219 }
 220
 221 setup_interface_static() {
 222         local iface="$1"
 223         local config="$2"
 224
 225         local ipaddr netmask ip6addr
 226         config_get ipaddr "$config" ipaddr
 227         config_get netmask "$config" netmask
 228         config_get ip6addr "$config" ip6addr
 229         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 230
 231         local gateway ip6gw dns bcast
 232         config_get gateway "$config" gateway
 233         config_get ip6gw "$config" ip6gw
 234         config_get dns "$config" dns
 235         config_get bcast "$config" broadcast
 236
 237         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 238         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 239         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" dev "$iface"
 240         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" dev "$iface"
 241         [ -z "$dns" ] || add_dns "$config" $dns
 242
 243         config_get type "$config" TYPE
 244         [ "$type" = "alias" ] && return 0
 245
 246         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 247 }
 248
 249 setup_interface_alias() {
 250         local config="$1"
 251         local parent="$2"
 252         local iface="$3"
 253
 254         local cfg
 255         config_get cfg "$config" interface
 256         [ "$parent" == "$cfg" ] || return 0
 257
 258         # parent device and ifname
 259         local p_device p_type
 260         config_get p_device "$cfg" device
 261         config_get p_type   "$cfg" type
 262
 263         # select alias ifname
 264         local layer use_iface
 265         config_get layer "$config" layer 2
 266         case "$layer:$p_type" in
 267                 # layer 3: e.g. pppoe-wan or pptp-vpn
 268                 3:*)      use_iface="$iface" ;;
 269
 270                 # layer 2 and parent is bridge: e.g. br-wan
 271                 2:bridge) use_iface="br-$cfg" ;;
 272
 273                 # layer 1: e.g. eth0 or ath0
 274                 *)        use_iface="$p_device" ;;
 275         esac
 276
 277         # alias counter
 278         local ctr
 279         config_get ctr "$parent" alias_count 0
 280         ctr="$(($ctr + 1))"
 281         config_set "$parent" alias_count "$ctr"
 282
 283         # alias list
 284         local list
 285         config_get list "$parent" aliases
 286         append list "$config"
 287         config_set "$parent" aliases "$list"
 288
 289         use_iface="$use_iface:$ctr"
 290         set_interface_ifname "$config" "$use_iface"
 291
 292         local proto
 293         config_get proto "$config" proto "static"
 294         case "${proto}" in
 295                 static)
 296                         setup_interface_static "$use_iface" "$config"
 297                 ;;
 298                 *)
 299                         echo "Unsupported type '$proto' for alias config '$config'"
 300                         return 1
 301                 ;;
 302         esac
 303 }
 304
 305 setup_interface() {
 306         local iface="$1"
 307         local config="$2"
 308         local proto="$3"
 309         local vifmac="$4"
 310
 311         [ -n "$config" ] || {
 312                 config=$(find_config "$iface")
 313                 [ "$?" = 0 ] || return 1
 314         }
 315
 316         prepare_interface "$iface" "$config" "$vifmac" || return 0
 317
 318         [ "$iface" = "br-$config" ] && {
 319                 # need to bring up the bridge and wait a second for
 320                 # it to switch to the 'forwarding' state, otherwise
 321                 # it will lose its routes...
 322                 ifconfig "$iface" up
 323                 sleep 1
 324         }
 325
 326         # Interface settings
 327         grep "$iface:" /proc/net/dev > /dev/null && {
 328                 local mtu macaddr
 329                 config_get mtu "$config" mtu
 330                 config_get macaddr "$config" macaddr
 331                 config_get txqueuelen "$config" txqueuelen
 332                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
 333                 $DEBUG ifconfig "$iface_main" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} ${txqueuelen:+txqueuelen $txqueuelen} up
 334         }
 335         set_interface_ifname "$config" "$iface"
 336
 337         [ -n "$proto" ] || config_get proto "$config" proto
 338         case "$proto" in
 339                 static)
 340                         setup_interface_static "$iface" "$config"
 341                 ;;
 342                 dhcp)
 343                         local lockfile="/var/lock/dhcp-$iface"
 344                         lock "$lockfile"
 345
 346                         # prevent udhcpc from starting more than once
 347                         local pidfile="/var/run/dhcp-${iface}.pid"
 348                         local pid="$(cat "$pidfile" 2>/dev/null)"
 349                         if [ -d "/proc/$pid" ] && grep -qs udhcpc "/proc/${pid}/cmdline"; then
 350                                 lock -u "$lockfile"
 351                         else
 352                                 local ipaddr netmask hostname proto1 clientid broadcast
 353                                 config_get ipaddr "$config" ipaddr
 354                                 config_get netmask "$config" netmask
 355                                 config_get hostname "$config" hostname
 356                                 config_get proto1 "$config" proto
 357                                 config_get clientid "$config" clientid
 358                                 config_get_bool broadcast "$config" broadcast 0
 359
 360                                 [ -z "$ipaddr" ] || \
 361                                         $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 362
 363                                 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 364                                 local dhcpopts
 365                                 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 366                                 [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
 367
 368                                 $DEBUG eval udhcpc -t 0 -i "$iface" \
 369                                         ${ipaddr:+-r $ipaddr} \
 370                                         ${hostname:+-H $hostname} \
 371                                         ${clientid:+-c $clientid} \
 372                                         -b -p "$pidfile" $broadcast \
 373                                         ${dhcpopts:- -O rootpath -R &}
 374
 375                                 lock -u "$lockfile"
 376                         fi
 377                 ;;
 378                 none)
 379                         setup_interface_none "$iface" "$config"
 380                 ;;
 381                 *)
 382                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 383                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 384                         else
 385                                 echo "Interface type $proto not supported."
 386                                 return 1
 387                         fi
 388                 ;;
 389         esac
 390 }
 391
 392 stop_interface_dhcp() {
 393         local config="$1"
 394
 395         local ifname
 396         config_get ifname "$config" ifname
 397
 398         local lock="/var/lock/dhcp-${ifname}"
 399         [ -f "$lock" ] && lock -u "$lock"
 400
 401         remove_dns "$config"
 402
 403         local pidfile="/var/run/dhcp-${ifname}.pid"
 404         local pid="$(cat "$pidfile" 2>/dev/null)"
 405         [ -d "/proc/$pid" ] && {
 406                 grep -qs udhcpc "/proc/$pid/cmdline" && kill -TERM $pid && \
 407                         while grep -qs udhcpc "/proc/$pid/cmdline"; do sleep 1; done
 408                 rm -f "$pidfile"
 409         }
 410
 411         uci -P /var/state revert "network.$config"
 412 }
 413
 414 unbridge() {
 415         local dev="$1"
 416         local brdev
 417
 418         [ -x /usr/sbin/brctl ] || return 0
 419         brctl show 2>/dev/null | grep "$dev" >/dev/null && {
 420                 # interface is still part of a bridge, correct that
 421
 422                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 423                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 424                 done
 425         }
 426 }