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