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