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

   1 #!/bin/sh
   2 # Copyright (C) 2006 OpenWrt.org
   3
   4 # DEBUG="echo"
   5
   6 find_config() {
   7         local iftype device iface ifaces ifn
   8         for ifn in $interfaces; do
   9                 config_get iftype "$ifn" type
  10                 config_get iface "$ifn" ifname
  11                 case "$iftype" in
  12                         bridge) config_get ifaces "$ifn" ifnames;;
  13                 esac
  14                 config_get device "$ifn" device
  15                 for ifc in $device $iface $ifaces; do
  16                         [ ."$ifc" = ."$1" ] && {
  17                                 echo "$ifn"
  18                                 return 0
  19                         }
  20                 done
  21         done
  22
  23         return 1;
  24 }
  25
  26 scan_interfaces() {
  27         local cfgfile="${1:-network}"
  28         interfaces=
  29         config_cb() {
  30                 case "$1" in
  31                         interface)
  32                                 config_set "$2" auto 1
  33                         ;;
  34                 esac
  35                 local iftype ifname device proto
  36                 config_get iftype "$CONFIG_SECTION" TYPE
  37                 case "$iftype" in
  38                         interface)
  39                                 append interfaces "$CONFIG_SECTION"
  40                                 config_get proto "$CONFIG_SECTION" proto
  41                                 config_get iftype "$CONFIG_SECTION" type
  42                                 config_get ifname "$CONFIG_SECTION" ifname
  43                                 config_get device "$CONFIG_SECTION" device "$ifname"
  44                                 config_set "$CONFIG_SECTION" device "$device"
  45                                 case "$iftype" in
  46                                         bridge)
  47                                                 config_set "$CONFIG_SECTION" ifnames "$device"
  48                                                 config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
  49                                         ;;
  50                                 esac
  51                                 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
  52                         ;;
  53                 esac
  54         }
  55         config_load "${cfgfile}"
  56 }
  57
  58 add_vlan() {
  59         local vif="${1%\.*}"
  60
  61         [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
  62                 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
  63                 $DEBUG vconfig add "$vif" "${1##*\.}"
  64                 return 0
  65         }
  66         return 1
  67 }
  68
  69 # sort the device list, drop duplicates
  70 sort_list() {
  71         local arg="$*"
  72         (
  73                 for item in $arg; do
  74                         echo "$item"
  75                 done
  76         ) | sort -u
  77 }
  78
  79 # Create the interface, if necessary.
  80 # Return status 0 indicates that the setup_interface() call should continue
  81 # Return status 1 means that everything is set up already.
  82
  83 prepare_interface() {
  84         local iface="$1"
  85         local config="$2"
  86         local vifmac="$3"
  87
  88         # if we're called for the bridge interface itself, don't bother trying
  89         # to create any interfaces here. The scripts have already done that, otherwise
  90         # the bridge interface wouldn't exist.
  91         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
  92
  93         ifconfig "$iface" 2>/dev/null >/dev/null && {
  94                 local proto
  95                 config_get proto "$config" proto
  96
  97                 # make sure the interface is removed from any existing bridge and deconfigured,
  98                 # (deconfigured only if the interface is not set to proto=none)
  99                 unbridge "$iface"
 100                 [ "$proto" = none ] || ifconfig "$iface" 0.0.0.0
 101
 102                 # Change interface MAC address if requested
 103                 [ -n "$vifmac" ] && {
 104                         ifconfig "$iface" down
 105                         ifconfig "$iface" hw ether "$vifmac" up
 106                 }
 107         }
 108
 109         # Setup VLAN interfaces
 110         add_vlan "$iface" && return 1
 111         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 112
 113         # Setup bridging
 114         local iftype
 115         config_get iftype "$config" type
 116         case "$iftype" in
 117                 bridge)
 118                         [ -x /usr/sbin/brctl ] && {
 119                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 120                                         local newdevs devices
 121                                         config_get devices "$config" device
 122                                         for dev in $(sort_list "$devices" "$iface"); do
 123                                                 append newdevs "$dev"
 124                                         done
 125                                         uci_set_state network "$config" device "$newdevs"
 126                                         $DEBUG brctl addif "br-$config" "$iface"
 127                                         # Bridge existed already. No further processing necesary
 128                                 } || {
 129                                         local stp
 130                                         config_get_bool stp "$config" stp 0
 131                                         $DEBUG brctl addbr "br-$config"
 132                                         $DEBUG brctl setfd "br-$config" 0
 133                                         $DEBUG ifconfig "br-$config" up
 134                                         $DEBUG brctl addif "br-$config" "$iface"
 135                                         $DEBUG brctl stp "br-$config" $stp
 136                                         # Creating the bridge here will have triggered a hotplug event, which will
 137                                         # result in another setup_interface() call, so we simply stop processing
 138                                         # the current event at this point.
 139                                 }
 140                                 ifconfig "$iface" up 2>/dev/null >/dev/null
 141                                 return 1
 142                         }
 143                 ;;
 144         esac
 145         return 0
 146 }
 147
 148 set_interface_ifname() {
 149         local config="$1"
 150         local ifname="$2"
 151
 152         local device
 153         config_get device "$1" device
 154         uci_set_state network "$config" ifname "$ifname"
 155         uci_set_state network "$config" device "$device"
 156 }
 157
 158 setup_interface_none() {
 159         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 160 }
 161
 162 setup_interface_static() {
 163         local iface="$1"
 164         local config="$2"
 165
 166         local ipaddr netmask ip6addr
 167         config_get ipaddr "$config" ipaddr
 168         config_get netmask "$config" netmask
 169         config_get ip6addr "$config" ip6addr
 170         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 171
 172         local gateway ip6gw dns bcast
 173         config_get gateway "$config" gateway
 174         config_get ip6gw "$config" ip6gw
 175         config_get dns "$config" dns
 176         config_get bcast "$config" broadcast
 177
 178         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 179         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 180         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" dev "$iface"
 181         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" dev "$iface"
 182         [ -z "$dns" ] || {
 183                 for ns in $dns; do
 184                         grep "$ns" /tmp/resolv.conf.auto 2>/dev/null >/dev/null || {
 185                                 echo "nameserver $ns" >> /tmp/resolv.conf.auto
 186                         }
 187                 done
 188         }
 189
 190         config_get type "$config" TYPE
 191         [ "$type" = "alias" ] && return 0
 192
 193         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 194 }
 195
 196 setup_interface_alias() {
 197         local config="$1"
 198         local parent="$2"
 199         local iface="$3"
 200
 201         local cfg
 202         config_get cfg "$config" interface
 203         [ "$parent" == "$cfg" ] || return 0
 204
 205         # alias counter
 206         local ctr
 207         config_get ctr "$parent" alias_count 0
 208         ctr="$(($ctr + 1))"
 209         config_set "$parent" alias_count "$ctr"
 210
 211         # alias list
 212         local list
 213         config_get list "$parent" aliases
 214         append list "$config"
 215         config_set "$parent" aliases "$list"
 216
 217         iface="$iface:$ctr"
 218         set_interface_ifname "$config" "$iface"
 219
 220         local proto
 221         config_get proto "$config" proto "static"
 222         case "${proto}" in
 223                 static)
 224                         setup_interface_static "$iface" "$config"
 225                 ;;
 226                 *)
 227                         echo "Unsupported type '$proto' for alias config '$config'"
 228                         return 1
 229                 ;;
 230         esac
 231 }
 232
 233 setup_interface() {
 234         local iface="$1"
 235         local config="$2"
 236         local proto="$3"
 237         local vifmac="$4"
 238
 239         [ -n "$config" ] || {
 240                 config=$(find_config "$iface")
 241                 [ "$?" = 0 ] || return 1
 242         }
 243
 244         prepare_interface "$iface" "$config" "$vifmac" || return 0
 245
 246         [ "$iface" = "br-$config" ] && {
 247                 # need to bring up the bridge and wait a second for
 248                 # it to switch to the 'forwarding' state, otherwise
 249                 # it will lose its routes...
 250                 ifconfig "$iface" up
 251                 sleep 1
 252         }
 253
 254         # Interface settings
 255         grep "$iface:" /proc/net/dev > /dev/null && {
 256                 local mtu macaddr
 257                 config_get mtu "$config" mtu
 258                 config_get macaddr "$config" macaddr
 259                 [ -n "$macaddr" ] && $DEBUG ifconfig "$iface" down
 260                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 261         }
 262         set_interface_ifname "$config" "$iface"
 263
 264         pidfile="/var/run/$iface.pid"
 265         [ -n "$proto" ] || config_get proto "$config" proto
 266         case "$proto" in
 267                 static)
 268                         setup_interface_static "$iface" "$config"
 269                 ;;
 270                 dhcp)
 271                         # prevent udhcpc from starting more than once
 272                         lock "/var/lock/dhcp-$iface"
 273                         local pid="$(cat "$pidfile" 2>/dev/null)"
 274                         if [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null; then
 275                                 lock -u "/var/lock/dhcp-$iface"
 276                         else
 277                                 local ipaddr netmask hostname proto1 clientid
 278                                 config_get ipaddr "$config" ipaddr
 279                                 config_get netmask "$config" netmask
 280                                 config_get hostname "$config" hostname
 281                                 config_get proto1 "$config" proto
 282                                 config_get clientid "$config" clientid
 283
 284                                 [ -z "$ipaddr" ] || \
 285                                         $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 286
 287                                 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 288                                 local dhcpopts
 289                                 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 290                                 $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} ${clientid:+-c $clientid} -b -p "$pidfile" ${dhcpopts:- -R &}
 291                                 lock -u "/var/lock/dhcp-$iface"
 292                         fi
 293                 ;;
 294                 none)
 295                         setup_interface_none "$iface" "$config"
 296                 ;;
 297                 *)
 298                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 299                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 300                         else
 301                                 echo "Interface type $proto not supported."
 302                                 return 1
 303                         fi
 304                 ;;
 305         esac
 306         [ "$proto" = none ] || {
 307                 for ifn in `ifconfig | grep "^$iface:" | awk '{print $1}'`; do
 308                         ifconfig "$ifn" down
 309                 done
 310         }
 311
 312         local aliases
 313         config_set "$config" aliases ""
 314         config_set "$config" alias_count 0
 315         config_foreach setup_interface_alias alias "$config" "$iface"
 316         config_get aliases "$config" aliases
 317         [ -z "$aliases" ] || uci_set_state network "$config" aliases "$aliases"
 318 }
 319
 320 unbridge() {
 321         local dev="$1"
 322         local brdev
 323
 324         [ -x /usr/sbin/brctl ] || return 0
 325         brctl show | grep "$dev" >/dev/null && {
 326                 # interface is still part of a bridge, correct that
 327
 328                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 329                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 330                 done
 331         }
 332 }