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