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

   1 #!/bin/sh
   2 # Copyright (C) 2006-2011 OpenWrt.org
   3
   4 # DEBUG="echo"
   5
   6 . /lib/functions/service.sh
   7
   8 do_sysctl() {
   9         [ -n "$2" ] && \
  10                 sysctl -n -e -w "$1=$2" >/dev/null || \
  11                 sysctl -n -e "$1"
  12 }
  13
  14 map_sysctls() {
  15         local cfg="$1"
  16         local ifn="$2"
  17
  18         local fam
  19         for fam in ipv4 ipv6; do
  20                 if [ -d /proc/sys/net/$fam ]; then
  21                         local key
  22                         for key in /proc/sys/net/$fam/*/$ifn/*; do
  23                                 local val
  24                                 config_get val "$cfg" "${fam}_${key##*/}"
  25                                 [ -n "$val" ] && echo -n "$val" > "$key"
  26                         done
  27                 fi
  28         done
  29 }
  30
  31 find_config() {
  32         local iftype device iface ifaces ifn
  33         for ifn in $interfaces; do
  34                 config_get iftype "$ifn" type
  35                 config_get iface "$ifn" ifname
  36                 case "$iftype" in
  37                         bridge) config_get ifaces "$ifn" ifnames;;
  38                 esac
  39                 config_get device "$ifn" device
  40                 for ifc in $device $iface $ifaces; do
  41                         [ ."$ifc" = ."$1" ] && {
  42                                 echo "$ifn"
  43                                 return 0
  44                         }
  45                 done
  46         done
  47
  48         return 1;
  49 }
  50
  51 fixup_interface() {
  52                 local iftype ifname device proto
  53                 local __cfg="$1"
  54
  55                 config_get iftype "$__cfg" TYPE
  56                 case "$iftype" in
  57                         interface)
  58                                 append interfaces "$__cfg"
  59                                 config_get proto "$__cfg" proto
  60                                 config_get iftype "$__cfg" type
  61                                 config_get ifname "$__cfg" ifname
  62                                 config_get device "$__cfg" device "$ifname"
  63                                 config_set "$__cfg" device "$device"
  64                                 case "$iftype" in
  65                                         bridge)
  66                                                 config_set "$__cfg" ifnames "$device"
  67                                                 config_set "$__cfg" ifname br-"$CONFIG_SECTION"
  68                                         ;;
  69                                 esac
  70                                 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$__cfg'"
  71                         ;;
  72                 esac
  73 }
  74
  75 scan_interfaces() {
  76         local cfgfile="${1:-network}"
  77         interfaces=
  78         config_cb() {
  79                 case "$1" in
  80                         interface)
  81                                 config_set "$2" auto 1
  82                         ;;
  83                 esac
  84                 fixup_interface "$CONFIG_SECTION"
  85         }
  86         config_load "${cfgfile}"
  87 }
  88
  89 add_vlan() {
  90         local vif="${1%\.*}"
  91
  92         [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
  93                 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
  94                 $DEBUG vconfig set_name_type DEV_PLUS_VID_NO_PAD
  95                 $DEBUG vconfig add "$vif" "${1##*\.}"
  96                 return 0
  97         }
  98         return 1
  99 }
 100
 101 # add dns entries if they are not in resolv.conf yet
 102 add_dns() {
 103         local cfg="$1"; shift
 104
 105         remove_dns "$cfg"
 106
 107         # We may be called by pppd's ip-up which has a nonstandard umask set.
 108         # Create an empty file here and force its permission to 0644, otherwise
 109         # dnsmasq will not be able to re-read the resolv.conf.auto .
 110         [ ! -f /tmp/resolv.conf.auto ] && {
 111                 touch /tmp/resolv.conf.auto
 112                 chmod 0644 /tmp/resolv.conf.auto
 113         }
 114
 115         local dns
 116         local add
 117         for dns in "$@"; do
 118                 grep -qsE "^nameserver ${dns//./\\.}$" /tmp/resolv.conf.auto || {
 119                         add="${add:+$add }$dns"
 120                         echo "nameserver $dns" >> /tmp/resolv.conf.auto
 121                 }
 122         done
 123
 124         [ -n "$cfg" ] && {
 125                 uci_toggle_state network "$cfg" dns "$add"
 126                 uci_toggle_state network "$cfg" resolv_dns "$add"
 127         }
 128 }
 129
 130 # remove dns entries of the given iface
 131 remove_dns() {
 132         local cfg="$1"
 133
 134         [ -n "$cfg" ] && {
 135                 [ -f /tmp/resolv.conf.auto ] && {
 136                         local dns=$(uci_get_state network "$cfg" resolv_dns)
 137                         for dns in $dns; do
 138                                 sed -i -e "/^nameserver ${dns//./\\.}$/d" /tmp/resolv.conf.auto
 139                         done
 140                 }
 141
 142                 uci_revert_state network "$cfg" dns
 143                 uci_revert_state network "$cfg" resolv_dns
 144         }
 145 }
 146
 147 # sort the device list, drop duplicates
 148 sort_list() {
 149         local arg="$*"
 150         (
 151                 for item in $arg; do
 152                         echo "$item"
 153                 done
 154         ) | sort -u
 155 }
 156
 157 prepare_interface_bridge() {
 158         return 0
 159 }
 160
 161 # Create the interface, if necessary.
 162 # Return status 0 indicates that the setup_interface() call should continue
 163 # Return status 1 means that everything is set up already.
 164
 165 prepare_interface() {
 166         local iface="$1"
 167         local config="$2"
 168         local macaddr="$3"
 169
 170         # if we're called for the bridge interface itself, don't bother trying
 171         # to create any interfaces here. The scripts have already done that, otherwise
 172         # the bridge interface wouldn't exist.
 173         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
 174
 175         ifconfig "$iface" 2>/dev/null >/dev/null && {
 176                 local proto
 177                 config_get proto "$config" proto
 178
 179                 # make sure the interface is removed from any existing bridge and deconfigured,
 180                 # (deconfigured only if the interface is not set to proto=none)
 181                 unbridge "$iface"
 182
 183                 local mtu macaddr txqueuelen
 184                 config_get mtu "$config" mtu
 185                 [ -n "$macaddr" ] || config_get macaddr "$config" macaddr
 186                 config_get txqueuelen "$config" txqueuelen
 187                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
 188                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} ${txqueuelen:+txqueuelen $txqueuelen} up
 189
 190                 [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
 191
 192                 # Apply sysctl settings
 193                 map_sysctls "$config" "$iface"
 194         }
 195
 196         # Setup VLAN interfaces
 197         add_vlan "$iface" && return 1
 198         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 199
 200         # Setup bridging
 201         local iftype
 202         config_get iftype "$config" type
 203         case "$iftype" in
 204                 bridge)
 205                         local macaddr
 206                         config_get macaddr "$config" macaddr
 207                         [ -x /usr/sbin/brctl ] && {
 208                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 209                                         local newdevs devices
 210                                         config_get devices "$config" device
 211                                         for dev in $(sort_list "$devices" "$iface"); do
 212                                                 append newdevs "$dev"
 213                                         done
 214                                         uci_toggle_state network "$config" device "$newdevs"
 215                                         $DEBUG ifconfig "$iface" 0.0.0.0
 216                                         $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
 217                                         $DEBUG brctl addif "br-$config" "$iface"
 218                                         # Bridge existed already. No further processing necesary
 219                                 } || {
 220                                         local stp igmp_snooping
 221                                         config_get_bool stp "$config" stp 0
 222                                         config_get_bool igmp_snooping "$config" igmp_snooping 1
 223                                         $DEBUG brctl addbr "br-$config"
 224                                         $DEBUG brctl setfd "br-$config" 0
 225                                         $DEBUG ifconfig "$iface" 0.0.0.0
 226                                         $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
 227                                         $DEBUG brctl addif "br-$config" "$iface"
 228                                         $DEBUG brctl stp "br-$config" $stp
 229                                         [ -z "$macaddr" ] && macaddr="$(cat /sys/class/net/$iface/address)"
 230                                         [ -e /sys/devices/virtual/net/br-$config/bridge/multicast_snooping ] && \
 231                                                 echo $igmp_snooping > /sys/devices/virtual/net/br-$config/bridge/multicast_snooping
 232                                         $DEBUG ifconfig "br-$config" hw ether $macaddr up
 233                                         # Creating the bridge here will have triggered a hotplug event, which will
 234                                         # result in another setup_interface() call, so we simply stop processing
 235                                         # the current event at this point.
 236                                 }
 237                                 ifconfig "$iface" ${macaddr:+hw ether "${macaddr}"} up 2>/dev/null >/dev/null
 238                                 return 1
 239                         }
 240                 ;;
 241         esac
 242         return 0
 243 }
 244
 245 set_interface_ifname() {
 246         local config="$1"
 247         local ifname="$2"
 248
 249         local device
 250         config_get device "$1" device
 251         uci_toggle_state network "$config" ifname "$ifname"
 252         uci_toggle_state network "$config" device "$device"
 253 }
 254
 255 setup_interface_none() {
 256         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 257 }
 258
 259 setup_interface_static() {
 260         local iface="$1"
 261         local config="$2"
 262
 263         local ipaddr netmask ip6addr
 264         config_get ipaddr "$config" ipaddr
 265         config_get netmask "$config" netmask
 266         config_get ip6addr "$config" ip6addr
 267         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 268
 269         local gateway ip6gw dns bcast metric
 270         config_get gateway "$config" gateway
 271         config_get ip6gw "$config" ip6gw
 272         config_get dns "$config" dns
 273         config_get bcast "$config" broadcast
 274         config_get metric "$config" metric
 275
 276         case "$ip6addr" in
 277                 */*) ;;
 278                 *:*) ip6addr="$ip6addr/64" ;;
 279         esac
 280
 281         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 282         [ -z "$ip6addr" ] || $DEBUG ifconfig "${iface%:*}" add "$ip6addr"
 283         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" ${metric:+metric $metric} dev "$iface"
 284         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" ${metric:+metric $metric} dev "${iface%:*}"
 285         [ -z "$dns" ] || add_dns "$config" $dns
 286
 287         config_get type "$config" TYPE
 288         [ "$type" = "alias" ] && return 0
 289
 290         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 291 }
 292
 293 setup_interface_alias() {
 294         local config="$1"
 295         local parent="$2"
 296         local iface="$3"
 297
 298         local cfg
 299         config_get cfg "$config" interface
 300         [ "$parent" == "$cfg" ] || return 0
 301
 302         # parent device and ifname
 303         local p_device p_type
 304         config_get p_device "$cfg" device
 305         config_get p_type   "$cfg" type
 306
 307         # select alias ifname
 308         local layer use_iface
 309         config_get layer "$config" layer 2
 310         case "$layer:$p_type" in
 311                 # layer 3: e.g. pppoe-wan or pptp-vpn
 312                 3:*)      use_iface="$iface" ;;
 313
 314                 # layer 2 and parent is bridge: e.g. br-wan
 315                 2:bridge) use_iface="br-$cfg" ;;
 316
 317                 # layer 1: e.g. eth0 or ath0
 318                 *)        use_iface="$p_device" ;;
 319         esac
 320
 321         # alias counter
 322         local ctr
 323         config_get ctr "$parent" alias_count 0
 324         ctr="$(($ctr + 1))"
 325         config_set "$parent" alias_count "$ctr"
 326
 327         # alias list
 328         local list
 329         config_get list "$parent" aliases
 330         append list "$config"
 331         config_set "$parent" aliases "$list"
 332
 333         use_iface="$use_iface:$ctr"
 334         set_interface_ifname "$config" "$use_iface"
 335
 336         local proto
 337         config_get proto "$config" proto "static"
 338         case "${proto}" in
 339                 static)
 340                         setup_interface_static "$use_iface" "$config"
 341                 ;;
 342                 *)
 343                         echo "Unsupported type '$proto' for alias config '$config'"
 344                         return 1
 345                 ;;
 346         esac
 347 }
 348
 349 setup_interface() {
 350         local iface="$1"
 351         local config="$2"
 352         local proto="$3"
 353         local vifmac="$4"
 354
 355         [ -n "$config" ] || {
 356                 config=$(find_config "$iface")
 357                 [ "$?" = 0 ] || return 1
 358         }
 359
 360         prepare_interface "$iface" "$config" "$vifmac" || return 0
 361
 362         [ "$iface" = "br-$config" ] && {
 363                 # need to bring up the bridge and wait a second for
 364                 # it to switch to the 'forwarding' state, otherwise
 365                 # it will lose its routes...
 366                 ifconfig "$iface" up
 367                 sleep 1
 368         }
 369
 370         # Interface settings
 371         set_interface_ifname "$config" "$iface"
 372
 373         [ -n "$proto" ] || config_get proto "$config" proto
 374         case "$proto" in
 375                 static)
 376                         setup_interface_static "$iface" "$config"
 377                 ;;
 378                 dhcp)
 379                         # kill running udhcpc instance
 380                         local pidfile="/var/run/dhcp-${iface}.pid"
 381
 382                         SERVICE_PID_FILE="$pidfile" \
 383                         service_stop /sbin/udhcpc
 384
 385                         local ipaddr netmask hostname proto1 clientid vendorid broadcast reqopts
 386                         config_get ipaddr "$config" ipaddr
 387                         config_get netmask "$config" netmask
 388                         config_get hostname "$config" hostname
 389                         config_get proto1 "$config" proto
 390                         config_get clientid "$config" clientid
 391                         config_get vendorid "$config" vendorid
 392                         config_get_bool broadcast "$config" broadcast 0
 393                         config_get reqopts "$config" reqopts
 394
 395                         [ -z "$ipaddr" ] || \
 396                                 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 397
 398                         # additional request options
 399                         local opt dhcpopts daemonize
 400                         for opt in $reqopts; do
 401                                 append dhcpopts "-O $opt"
 402                         done
 403
 404                         # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 405                         [ "$proto1" != "$proto" ] && {
 406                                 append dhcpopts "-n -q"
 407                         } || {
 408                                 append dhcpopts "-O rootpath -R"
 409                                 daemonize=1
 410                         }
 411                         [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
 412
 413                         SERVICE_DAEMONIZE=$daemonize \
 414                         SERVICE_PID_FILE="$pidfile" \
 415                         service_start /sbin/udhcpc -t 0 -i "$iface" \
 416                                 ${ipaddr:+-r $ipaddr} \
 417                                 ${hostname:+-H $hostname} \
 418                                 ${clientid:+-c $clientid} \
 419                                 ${vendorid:+-V $vendorid} \
 420                                 -b -p "$pidfile" $broadcast \
 421                                 ${dhcpopts}
 422                 ;;
 423                 none)
 424                         setup_interface_none "$iface" "$config"
 425                 ;;
 426                 *)
 427                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 428                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 429                         else
 430                                 echo "Interface type $proto not supported."
 431                                 return 1
 432                         fi
 433                 ;;
 434         esac
 435 }
 436
 437 stop_interface_dhcp() {
 438         local config="$1"
 439
 440         local ifname
 441         config_get ifname "$config" ifname
 442
 443         local lock="/var/lock/dhcp-${ifname}"
 444         [ -f "$lock" ] && lock -u "$lock"
 445
 446         remove_dns "$config"
 447
 448         SERVICE_PID_FILE="/var/run/dhcp-${ifname}.pid" \
 449         service_stop /sbin/udhcpc
 450
 451         uci -P /var/state revert "network.$config"
 452 }
 453
 454 unbridge() {
 455         local dev="$1"
 456         local brdev
 457
 458         [ -x /usr/sbin/brctl ] || return 0
 459         brctl show 2>/dev/null | grep "$dev" >/dev/null && {
 460                 # interface is still part of a bridge, correct that
 461
 462                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 463                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 464                         do_sysctl "net.ipv6.conf.$dev.disable_ipv6" 0
 465                 done
 466         }
 467 }