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 -qsF "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 vifmac="$3"
 156
 157         # if we're called for the bridge interface itself, don't bother trying
 158         # to create any interfaces here. The scripts have already done that, otherwise
 159         # the bridge interface wouldn't exist.
 160         [ "br-$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 "$iface"
 169                 [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
 170
 171                 # Change interface MAC address if requested
 172                 [ -n "$vifmac" ] && {
 173                         ifconfig "$iface" down
 174                         ifconfig "$iface" hw ether "$vifmac" up
 175                 }
 176
 177                 # Apply sysctl settings
 178                 map_sysctls "$config" "$iface"
 179         }
 180
 181         # Setup VLAN interfaces
 182         add_vlan "$iface" && return 1
 183         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 184
 185         # Setup bridging
 186         local iftype
 187         config_get iftype "$config" type
 188         case "$iftype" in
 189                 bridge)
 190                         local macaddr
 191                         config_get macaddr "$config" macaddr
 192                         [ -x /usr/sbin/brctl ] && {
 193                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 194                                         local newdevs devices
 195                                         config_get devices "$config" device
 196                                         for dev in $(sort_list "$devices" "$iface"); do
 197                                                 append newdevs "$dev"
 198                                         done
 199                                         uci_toggle_state network "$config" device "$newdevs"
 200                                         $DEBUG ifconfig "$iface" 0.0.0.0
 201                                         $DEBUG do_sysctl "net.ipv6.conf.$iface.disable_ipv6" 1
 202                                         $DEBUG brctl addif "br-$config" "$iface"
 203                                         # Bridge existed already. No further processing necesary
 204                                 } || {
 205                                         local stp
 206                                         config_get_bool stp "$config" stp 0
 207                                         $DEBUG brctl addbr "br-$config"
 208                                         $DEBUG brctl setfd "br-$config" 0
 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                                         $DEBUG brctl stp "br-$config" $stp
 213                                         [ -z "$macaddr" ] && macaddr="$(cat /sys/class/net/$iface/address)"
 214                                         $DEBUG ifconfig "br-$config" hw ether $macaddr up
 215                                         # Creating the bridge here will have triggered a hotplug event, which will
 216                                         # result in another setup_interface() call, so we simply stop processing
 217                                         # the current event at this point.
 218                                 }
 219                                 ifconfig "$iface" ${macaddr:+hw ether "${macaddr}"} up 2>/dev/null >/dev/null
 220                                 return 1
 221                         }
 222                 ;;
 223         esac
 224         return 0
 225 }
 226
 227 set_interface_ifname() {
 228         local config="$1"
 229         local ifname="$2"
 230
 231         local device
 232         config_get device "$1" device
 233         uci_toggle_state network "$config" ifname "$ifname"
 234         uci_toggle_state network "$config" device "$device"
 235 }
 236
 237 setup_interface_none() {
 238         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 239 }
 240
 241 setup_interface_static() {
 242         local iface="$1"
 243         local config="$2"
 244
 245         local ipaddr netmask ip6addrs ipaddr
 246         config_get ipaddr "$config" ipaddr
 247         config_get netmask "$config" netmask
 248         config_get ip6addrs "$config" ip6addr
 249         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 250
 251         local gateway ip6gw dns bcast metric
 252         config_get gateway "$config" gateway
 253         config_get ip6gw "$config" ip6gw
 254         config_get dns "$config" dns
 255         config_get bcast "$config" broadcast
 256         config_get metric "$config" metric
 257
 258         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 259         for ip6addr in $ip6addrs; do
 260                 case "$ip6addr" in
 261                         */*) ;;
 262                         *:*) ip6addr="$ip6addr/64" ;;
 263                 esac
 264                 $DEBUG ifconfig "$iface" add "$ip6addr"
 265         done
 266         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" ${metric:+metric $metric} dev "$iface"
 267         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" ${metric:+metric $metric} dev "$iface"
 268         [ -z "$dns" ] || add_dns "$config" $dns
 269
 270         config_get type "$config" TYPE
 271         [ "$type" = "alias" ] && return 0
 272
 273         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 274 }
 275
 276 setup_interface_alias() {
 277         local config="$1"
 278         local parent="$2"
 279         local iface="$3"
 280
 281         local cfg
 282         config_get cfg "$config" interface
 283         [ "$parent" == "$cfg" ] || return 0
 284
 285         # parent device and ifname
 286         local p_device p_type
 287         config_get p_device "$cfg" device
 288         config_get p_type   "$cfg" type
 289
 290         # select alias ifname
 291         local layer use_iface
 292         config_get layer "$config" layer 2
 293         case "$layer:$p_type" in
 294                 # layer 3: e.g. pppoe-wan or pptp-vpn
 295                 3:*)      use_iface="$iface" ;;
 296
 297                 # layer 2 and parent is bridge: e.g. br-wan
 298                 2:bridge) use_iface="br-$cfg" ;;
 299
 300                 # layer 1: e.g. eth0 or ath0
 301                 *)        use_iface="$p_device" ;;
 302         esac
 303
 304         # alias counter
 305         local ctr
 306         config_get ctr "$parent" alias_count 0
 307         ctr="$(($ctr + 1))"
 308         config_set "$parent" alias_count "$ctr"
 309
 310         # alias list
 311         local list
 312         config_get list "$parent" aliases
 313         append list "$config"
 314         config_set "$parent" aliases "$list"
 315
 316         use_iface="$use_iface:$ctr"
 317         set_interface_ifname "$config" "$use_iface"
 318
 319         local proto
 320         config_get proto "$config" proto "static"
 321         case "${proto}" in
 322                 static)
 323                         setup_interface_static "$use_iface" "$config"
 324                 ;;
 325                 *)
 326                         echo "Unsupported type '$proto' for alias config '$config'"
 327                         return 1
 328                 ;;
 329         esac
 330 }
 331
 332 setup_interface() {
 333         local iface="$1"
 334         local config="$2"
 335         local proto="$3"
 336         local vifmac="$4"
 337
 338         [ -n "$config" ] || {
 339                 config=$(find_config "$iface")
 340                 [ "$?" = 0 ] || return 1
 341         }
 342
 343         prepare_interface "$iface" "$config" "$vifmac" || return 0
 344
 345         [ "$iface" = "br-$config" ] && {
 346                 # need to bring up the bridge and wait a second for
 347                 # it to switch to the 'forwarding' state, otherwise
 348                 # it will lose its routes...
 349                 ifconfig "$iface" up
 350                 sleep 1
 351         }
 352
 353         # Interface settings
 354         grep -qE "^ *$iface:" /proc/net/dev && {
 355                 local mtu macaddr txqueuelen
 356                 config_get mtu "$config" mtu
 357                 config_get macaddr "$config" macaddr
 358                 config_get txqueuelen "$config" txqueuelen
 359                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
 360                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} ${txqueuelen:+txqueuelen $txqueuelen} up
 361         }
 362         set_interface_ifname "$config" "$iface"
 363
 364         [ -n "$proto" ] || config_get proto "$config" proto
 365         case "$proto" in
 366                 static)
 367                         setup_interface_static "$iface" "$config"
 368                 ;;
 369                 dhcp)
 370                         # kill running udhcpc instance
 371                         local pidfile="/var/run/dhcp-${iface}.pid"
 372                         service_kill udhcpc "$pidfile"
 373
 374                         local ipaddr netmask hostname proto1 clientid vendorid broadcast reqopts
 375                         config_get ipaddr "$config" ipaddr
 376                         config_get netmask "$config" netmask
 377                         config_get hostname "$config" hostname
 378                         config_get proto1 "$config" proto
 379                         config_get clientid "$config" clientid
 380                         config_get vendorid "$config" vendorid
 381                         config_get_bool broadcast "$config" broadcast 0
 382                         config_get reqopts "$config" reqopts
 383
 384                         [ -z "$ipaddr" ] || \
 385                                 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 386
 387                         # additional request options
 388                         local opt dhcpopts
 389                         for opt in $reqopts; do
 390                                 append dhcpopts "-O $opt"
 391                         done
 392
 393                         # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 394                         [ "$proto1" != "$proto" ] && append dhcpopts "-n -q" || append dhcpopts "-O rootpath -R &"
 395                         [ "$broadcast" = 1 ] && broadcast="-O broadcast" || broadcast=
 396
 397                         $DEBUG eval udhcpc -t 0 -i "$iface" \
 398                                 ${ipaddr:+-r $ipaddr} \
 399                                 ${hostname:+-H $hostname} \
 400                                 ${clientid:+-c $clientid} \
 401                                 ${vendorid:+-V $vendorid} \
 402                                 -b -p "$pidfile" $broadcast \
 403                                 ${dhcpopts}
 404                 ;;
 405                 none)
 406                         setup_interface_none "$iface" "$config"
 407                 ;;
 408                 *)
 409                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 410                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 411                         else
 412                                 echo "Interface type $proto not supported."
 413                                 return 1
 414                         fi
 415                 ;;
 416         esac
 417 }
 418
 419 stop_interface_dhcp() {
 420         local config="$1"
 421
 422         local ifname
 423         config_get ifname "$config" ifname
 424
 425         local lock="/var/lock/dhcp-${ifname}"
 426         [ -f "$lock" ] && lock -u "$lock"
 427
 428         remove_dns "$config"
 429
 430         local pidfile="/var/run/dhcp-${ifname}.pid"
 431         service_kill udhcpc "$pidfile"
 432
 433         uci -P /var/state revert "network.$config"
 434 }
 435
 436 unbridge() {
 437         local dev="$1"
 438         local brdev
 439
 440         [ -x /usr/sbin/brctl ] || return 0
 441         brctl show 2>/dev/null | grep "$dev" >/dev/null && {
 442                 # interface is still part of a bridge, correct that
 443
 444                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 445                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 446                         do_sysctl "net.ipv6.conf.$dev.disable_ipv6" 0
 447                 done
 448         }
 449 }