package/base-files/files/lib/network/config.sh

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 # DEBUG="echo"
   5
   6 do_sysctl() {
   7         [ -n "$2" ] && \
   8                 sysctl -n -e -w "$1=$2" >/dev/null || \
   9                 sysctl -n -e "$1"
  10 }
  11
  12 find_config() {
  13         local iftype device iface ifaces ifn
  14         for ifn in $interfaces; do
  15                 config_get iftype "$ifn" type
  16                 config_get iface "$ifn" ifname
  17                 case "$iftype" in
  18                         bridge) config_get ifaces "$ifn" ifnames;;
  19                 esac
  20                 config_get device "$ifn" device
  21                 for ifc in $device $iface $ifaces; do
  22                         [ ."$ifc" = ."$1" ] && {
  23                                 echo "$ifn"
  24                                 return 0
  25                         }
  26                 done
  27         done
  28
  29         return 1;
  30 }
  31
  32 scan_interfaces() {
  33         local cfgfile="${1:-network}"
  34         interfaces=
  35         config_cb() {
  36                 case "$1" in
  37                         interface)
  38                                 config_set "$2" auto 1
  39                         ;;
  40                 esac
  41                 local iftype ifname device proto
  42                 config_get iftype "$CONFIG_SECTION" TYPE
  43                 case "$iftype" in
  44                         interface)
  45                                 append interfaces "$CONFIG_SECTION"
  46                                 config_get proto "$CONFIG_SECTION" proto
  47                                 config_get iftype "$CONFIG_SECTION" type
  48                                 config_get ifname "$CONFIG_SECTION" ifname
  49                                 config_get device "$CONFIG_SECTION" device "$ifname"
  50                                 config_set "$CONFIG_SECTION" device "$device"
  51                                 case "$iftype" in
  52                                         bridge)
  53                                                 config_set "$CONFIG_SECTION" ifnames "$device"
  54                                                 config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
  55                                         ;;
  56                                 esac
  57                                 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
  58                         ;;
  59                 esac
  60         }
  61         config_load "${cfgfile}"
  62 }
  63
  64 add_vlan() {
  65         local vif="${1%\.*}"
  66
  67         [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
  68                 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
  69                 $DEBUG vconfig add "$vif" "${1##*\.}"
  70                 return 0
  71         }
  72         return 1
  73 }
  74
  75 # add dns entries if they are not in resolv.conf yet
  76 add_dns() {
  77         local cfg="$1"; shift
  78
  79         remove_dns "$cfg"
  80
  81         # We may be called by pppd's ip-up which has a nonstandard umask set.
  82         # Create an empty file here and force its permission to 0644, otherwise
  83         # dnsmasq will not be able to re-read the resolv.conf.auto .
  84         [ ! -f /tmp/resolv.conf.auto ] && {
  85                 touch /tmp/resolv.conf.auto
  86                 chmod 0644 /tmp/resolv.conf.auto
  87         }
  88
  89         local dns
  90         local add
  91         for dns in "$@"; do
  92                 grep -qsF "nameserver $dns" /tmp/resolv.conf.auto || {
  93                         add="${add:+$add }$dns"
  94                         echo "nameserver $dns" >> /tmp/resolv.conf.auto
  95                 }
  96         done
  97
  98         [ -n "$cfg" ] && {
  99                 uci_toggle_state network "$cfg" dns "$add"
 100                 uci_toggle_state network "$cfg" resolv_dns "$add"
 101         }
 102 }
 103
 104 # remove dns entries of the given iface
 105 remove_dns() {
 106         local cfg="$1"
 107
 108         [ -n "$cfg" ] && {
 109                 [ -f /tmp/resolv.conf.auto ] && {
 110                         local dns=$(uci_get_state network "$cfg" resolv_dns)
 111                         for dns in $dns; do
 112                                 sed -i -e "/^nameserver $dns$/d" /tmp/resolv.conf.auto
 113                         done
 114                 }
 115
 116                 uci_revert_state network "$cfg" dns
 117                 uci_revert_state network "$cfg" resolv_dns
 118         }
 119 }
 120
 121 # sort the device list, drop duplicates
 122 sort_list() {
 123         local arg="$*"
 124         (
 125                 for item in $arg; do
 126                         echo "$item"
 127                 done
 128         ) | sort -u
 129 }
 130
 131 # Create the interface, if necessary.
 132 # Return status 0 indicates that the setup_interface() call should continue
 133 # Return status 1 means that everything is set up already.
 134
 135 prepare_interface() {
 136         local iface="$1"
 137         local config="$2"
 138         local vifmac="$3"
 139
 140         # if we're called for the bridge interface itself, don't bother trying
 141         # to create any interfaces here. The scripts have already done that, otherwise
 142         # the bridge interface wouldn't exist.
 143         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
 144
 145         ifconfig "$iface" 2>/dev/null >/dev/null && {
 146                 local proto
 147                 config_get proto "$config" proto
 148
 149                 # make sure the interface is removed from any existing bridge and deconfigured,
 150                 # (deconfigured only if the interface is not set to proto=none)
 151                 unbridge "$iface"
 152                 [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
 153
 154                 # Change interface MAC address if requested
 155                 [ -n "$vifmac" ] && {
 156                         ifconfig "$iface" down
 157                         ifconfig "$iface" hw ether "$vifmac" up
 158                 }
 159         }
 160
 161         # Setup VLAN interfaces
 162         add_vlan "$iface" && return 1
 163         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 164
 165         # Setup bridging
 166         local iftype
 167         config_get iftype "$config" type
 168         case "$iftype" in
 169                 bridge)
 170                         local macaddr
 171                         config_get macaddr "$config" macaddr
 172                         [ -x /usr/sbin/brctl ] && {
 173                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 174                                         local newdevs devices
 175                                         config_get devices "$config" device
 176                                         for dev in $(sort_list "$devices" "$iface"); do
 177                                                 append newdevs "$dev"
 178                                         done
 179                                         uci_toggle_state network "$config" device "$newdevs"
 180                                         $DEBUG ifconfig "$iface" 0.0.0.0
 181                                         $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
 182                                         $DEBUG brctl addif "br-$config" "$iface"
 183                                         # Bridge existed already. No further processing necesary
 184                                 } || {
 185                                         local stp
 186                                         config_get_bool stp "$config" stp 0
 187                                         $DEBUG brctl addbr "br-$config"
 188                                         $DEBUG brctl setfd "br-$config" 0
 189                                         $DEBUG ifconfig "$iface" 0.0.0.0
 190                                         $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
 191                                         $DEBUG brctl addif "br-$config" "$iface"
 192                                         $DEBUG brctl stp "br-$config" $stp
 193                                         [ -z "$macaddr" -a -e "/sys/class/net/$iface/address" ] && macaddr="$(cat /sys/class/net/$iface/address)"
 194                                         $DEBUG ifconfig "br-$config" ${macaddr:+hw ether "${macaddr}"} up
 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 "$1" device
 213         uci_toggle_state network "$config" ifname "$ifname"
 214         uci_toggle_state network "$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 "$ip6addr" ] && return 1
 230
 231         local gateway ip6gw dns bcast metric
 232         config_get gateway "$config" gateway
 233         config_get ip6gw "$config" ip6gw
 234         config_get dns "$config" dns
 235         config_get bcast "$config" broadcast
 236         config_get metric "$config" metric
 237
 238         case "$ip6addr" in
 239                 */*) ;;
 240                 *:*) ip6addr="$ip6addr/64" ;;
 241         esac
 242
 243         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 244         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 245         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" ${metric:+metric $metric} dev "$iface"
 246         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" ${metric:+metric $metric} dev "$iface"
 247         [ -z "$dns" ] || add_dns "$config" $dns
 248
 249         config_get type "$config" TYPE
 250         [ "$type" = "alias" ] && return 0
 251
 252         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 253 }
 254
 255 setup_interface_alias() {
 256         local config="$1"
 257         local parent="$2"
 258         local iface="$3"
 259
 260         local cfg
 261         config_get cfg "$config" interface
 262         [ "$parent" == "$cfg" ] || return 0
 263
 264         # parent device and ifname
 265         local p_device p_type
 266         config_get p_device "$cfg" device
 267         config_get p_type   "$cfg" type
 268
 269         # select alias ifname
 270         local layer use_iface
 271         config_get layer "$config" layer 2
 272         case "$layer:$p_type" in
 273                 # layer 3: e.g. pppoe-wan or pptp-vpn
 274                 3:*)      use_iface="$iface" ;;
 275
 276                 # layer 2 and parent is bridge: e.g. br-wan
 277                 2:bridge) use_iface="br-$cfg" ;;
 278
 279                 # layer 1: e.g. eth0 or ath0
 280                 *)        use_iface="$p_device" ;;
 281         esac
 282
 283         # alias counter
 284         local ctr
 285         config_get ctr "$parent" alias_count 0
 286         ctr="$(($ctr + 1))"
 287         config_set "$parent" alias_count "$ctr"
 288
 289         # alias list
 290         local list
 291         config_get list "$parent" aliases
 292         append list "$config"
 293         config_set "$parent" aliases "$list"
 294
 295         use_iface="$use_iface:$ctr"
 296         set_interface_ifname "$config" "$use_iface"
 297
 298         local proto
 299         config_get proto "$config" proto "static"
 300         case "${proto}" in
 301                 static)
 302                         setup_interface_static "$use_iface" "$config"
 303                 ;;
 304                 *)
 305                         echo "Unsupported type '$proto' for alias config '$config'"
 306                         return 1
 307                 ;;
 308         esac
 309 }
 310
 311 setup_interface() {
 312         local iface="$1"
 313         local config="$2"
 314         local proto="$3"
 315         local vifmac="$4"
 316
 317         [ -n "$config" ] || {
 318                 config=$(find_config "$iface")
 319                 [ "$?" = 0 ] || return 1
 320         }
 321
 322         prepare_interface "$iface" "$config" "$vifmac" || return 0
 323
 324         [ "$iface" = "br-$config" ] && {
 325                 # need to bring up the bridge and wait a second for
 326                 # it to switch to the 'forwarding' state, otherwise
 327                 # it will lose its routes...
 328                 ifconfig "$iface" up
 329                 sleep 1
 330         }
 331
 332         # Interface settings
 333         grep -qE "^ *$iface:" /proc/net/dev && {
 334                 local mtu macaddr
 335                 config_get mtu "$config" mtu
 336                 config_get macaddr "$config" macaddr
 337                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
 338                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 339         }
 340         set_interface_ifname "$config" "$iface"
 341
 342         [ -n "$proto" ] || config_get proto "$config" proto
 343         case "$proto" in
 344                 static)
 345                         setup_interface_static "$iface" "$config"
 346                 ;;
 347                 dhcp)
 348                         # kill running udhcpc instance
 349                         local pidfile="/var/run/dhcp-${iface}.pid"
 350                         service_kill udhcpc "$pidfile"
 351
 352                         local ipaddr netmask hostname proto1 clientid vendorid 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 "$config" clientid
 358                         config_get vendorid "$config" vendorid
 359                         config_get_bool broadcast "$config" broadcast 0
 360
 361                         [ -z "$ipaddr" ] || \
 362                                 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 363
 364                         # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 365                         local dhcpopts
 366                         [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 367                         [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
 368
 369                         $DEBUG eval udhcpc -t 0 -i "$iface" \
 370                                 ${ipaddr:+-r $ipaddr} \
 371                                 ${hostname:+-H $hostname} \
 372                                 ${clientid:+-c $clientid} \
 373                                 ${vendorid:+-V $vendorid} \
 374                                 -b -p "$pidfile" $broadcast \
 375                                 ${dhcpopts:- -O rootpath -R &}
 376                 ;;
 377                 none)
 378                         setup_interface_none "$iface" "$config"
 379                 ;;
 380                 *)
 381                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 382                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 383                         else
 384                                 echo "Interface type $proto not supported."
 385                                 return 1
 386                         fi
 387                 ;;
 388         esac
 389 }
 390
 391 stop_interface_dhcp() {
 392         local config="$1"
 393
 394         local ifname
 395         config_get ifname "$config" ifname
 396
 397         local lock="/var/lock/dhcp-${ifname}"
 398         [ -f "$lock" ] && lock -u "$lock"
 399
 400         remove_dns "$config"
 401
 402         local pidfile="/var/run/dhcp-${ifname}.pid"
 403         service_kill udhcpc "$pidfile"
 404
 405         uci -P /var/state revert "network.$config"
 406 }
 407
 408 unbridge() {
 409         local dev="$1"
 410         local brdev
 411
 412         [ -x /usr/sbin/brctl ] || return 0
 413         brctl show 2>/dev/null | grep "$dev" >/dev/null && {
 414                 # interface is still part of a bridge, correct that
 415
 416                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 417                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 418                         do_sysctl "net.ipv6.conf.$dev.disable_ipv6" 0
 419                 done
 420         }
 421 }