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"
  28         local mode iftype iface ifname device
  29         interfaces=
  30         config_cb() {
  31                 case "$1" in
  32                         interface)
  33                                 config_set "$2" auto 1
  34                         ;;
  35                 esac
  36                 config_get iftype "$CONFIG_SECTION" TYPE
  37                 case "$iftype" in
  38                         interface)
  39                                 config_get proto "$CONFIG_SECTION" proto
  40                                 append interfaces "$CONFIG_SECTION"
  41                                 config_get iftype "$CONFIG_SECTION" type
  42                                 config_get ifname "$CONFIG_SECTION" ifname
  43                                 config_get device "$CONFIG_SECTION" device
  44                                 config_set "$CONFIG_SECTION" device "${device:-$ifname}"
  45                                 case "$iftype" in
  46                                         bridge)
  47                                                 config_set "$CONFIG_SECTION" ifnames "${device:-$ifname}"
  48                                                 config_set "$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 "${cfgfile:-network}"
  56 }
  57
  58 add_vlan() {
  59         local vif="${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 "$iface" 2>/dev/null >/dev/null && {
  94                 # make sure the interface is removed from any existing bridge and deconfigured
  95                 ifconfig "$iface" 0.0.0.0
  96                 unbridge "$iface"
  97
  98                 # Change interface MAC address if requested
  99                 [ -n "$vifmac" ] && {
 100                         ifconfig "$iface" down
 101                         ifconfig "$iface" hw ether "$vifmac" up
 102                 }
 103         }
 104
 105         # Setup VLAN interfaces
 106         add_vlan "$iface" && return 1
 107         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 108
 109         # Setup bridging
 110         config_get iftype "$config" type
 111         config_get stp "$config" stp
 112         case "$iftype" in
 113                 bridge)
 114                         [ -x /usr/sbin/brctl ] && {
 115                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 116                                         local newdevs=
 117
 118                                         config_get devices "$config" device
 119                                         for dev in $(sort_list "$devices" "$iface"); do
 120                                                 append newdevs "$dev"
 121                                         done
 122                                         uci_set_state network "$config" device "$newdevs"
 123                                         $DEBUG brctl addif "br-$config" "$iface"
 124                                         # Bridge existed already. No further processing necesary
 125                                 } || {
 126                                         $DEBUG brctl addbr "br-$config"
 127                                         $DEBUG brctl setfd "br-$config" 0
 128                                         $DEBUG ifconfig "br-$config" up
 129                                         $DEBUG brctl addif "br-$config" "$iface"
 130                                         $DEBUG brctl stp "br-$config" ${stp:-0}
 131                                         # Creating the bridge here will have triggered a hotplug event, which will
 132                                         # result in another setup_interface() call, so we simply stop processing
 133                                         # the current event at this point.
 134                                 }
 135                                 ifconfig "$iface" up 2>/dev/null >/dev/null
 136                                 return 1
 137                         }
 138                 ;;
 139         esac
 140         return 0
 141 }
 142
 143 set_interface_ifname() {
 144         local config="$1"
 145         local ifname="$2"
 146
 147         config_get device "$1" device
 148         uci_set_state network "$config" ifname "$ifname"
 149         uci_set_state network "$config" device "$device"
 150 }
 151
 152 setup_interface_none() {
 153         env -i ACTION="ifup" INTERFACE="$2" DEVICE="$1" PROTO=none /sbin/hotplug-call "iface" &
 154 }
 155
 156 setup_interface_static() {
 157         local iface="$1"
 158         local config="$2"
 159
 160         config_get ipaddr "$config" ipaddr
 161         config_get netmask "$config" netmask
 162         config_get ip6addr "$config" ip6addr
 163         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 164
 165         config_get gateway "$config" gateway
 166         config_get ip6gw "$config" ip6gw
 167         config_get dns "$config" dns
 168         config_get bcast "$config" broadcast
 169
 170         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 171         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 172         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" dev "$iface"
 173         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" dev "$iface"
 174         [ -z "$dns" ] || {
 175                 for ns in $dns; do
 176                         grep "$ns" /tmp/resolv.conf.auto 2>/dev/null >/dev/null || {
 177                                 echo "nameserver $ns" >> /tmp/resolv.conf.auto
 178                         }
 179                 done
 180         }
 181
 182         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 183 }
 184
 185 setup_interface_alias() {
 186         local config="$1"
 187         local parent="$2"
 188         local iface="$3"
 189
 190         config_get cfg "$config" interface
 191         [ "$parent" == "$cfg" ] || return 0
 192
 193         # alias counter
 194         config_get ctr "$parent" alias_count
 195         ctr="$(($ctr + 1))"
 196         config_set "$parent" alias_count "$ctr"
 197
 198         # alias list
 199         config_get list "$parent" aliases
 200         append list "$config"
 201         config_set "$parent" aliases "$list"
 202
 203         set_interface_ifname "$config" "$iface:$ctr"
 204         config_get proto "$config" proto
 205         case "${proto:-static}" in
 206                 static)
 207                         setup_interface_static "$iface:$ctr" "$config"
 208                 ;;
 209                 *)
 210                         echo "Unsupported type '$proto' for alias config '$config'"
 211                         return 1
 212                 ;;
 213         esac
 214 }
 215
 216 setup_interface() {
 217         local iface="$1"
 218         local config="$2"
 219         local vifmac="$4"
 220         local proto
 221         local macaddr
 222
 223         [ -n "$config" ] || {
 224                 config=$(find_config "$iface")
 225                 [ "$?" = 0 ] || return 1
 226         }
 227         proto="${3:-$(config_get "$config" proto)}"
 228
 229         prepare_interface "$iface" "$config" "$vifmac" || return 0
 230
 231         [ "$iface" = "br-$config" ] && {
 232                 # need to bring up the bridge and wait a second for
 233                 # it to switch to the 'forwarding' state, otherwise
 234                 # it will lose its routes...
 235                 ifconfig "$iface" up
 236                 sleep 1
 237         }
 238
 239         # Interface settings
 240         config_get mtu "$config" mtu
 241         config_get macaddr "$config" macaddr
 242         grep "$iface:" /proc/net/dev > /dev/null && \
 243                 $DEBUG ifconfig "$iface" down && \
 244                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 245         set_interface_ifname "$config" "$iface"
 246
 247         pidfile="/var/run/$iface.pid"
 248         case "$proto" in
 249                 static)
 250                         setup_interface_static "$iface" "$config"
 251                 ;;
 252                 dhcp)
 253                         # prevent udhcpc from starting more than once
 254                         lock "/var/lock/dhcp-$iface"
 255                         pid="$(cat "$pidfile" 2>/dev/null)"
 256                         if [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null; then
 257                                 lock -u "/var/lock/dhcp-$iface"
 258                         else
 259
 260                                 config_get ipaddr "$config" ipaddr
 261                                 config_get netmask "$config" netmask
 262                                 config_get hostname "$config" hostname
 263                                 config_get proto1 "$config" proto
 264                                 config_get clientid "$config" clientid
 265
 266                                 [ -z "$ipaddr" ] || \
 267                                         $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 268
 269                                 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 270                                 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 271                                 $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} ${clientid:+-c $clientid} -b -p "$pidfile" ${dhcpopts:- -R &}
 272                                 lock -u "/var/lock/dhcp-$iface"
 273                         fi
 274                 ;;
 275                 none)
 276                         setup_interface_none "$iface" "$config"
 277                 ;;
 278                 *)
 279                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 280                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 281                         else
 282                                 echo "Interface type $proto not supported."
 283                                 return 1
 284                         fi
 285                 ;;
 286         esac
 287         config_set "$config" aliases ""
 288         config_set "$config" alias_count 0
 289         config_foreach setup_interface_alias alias "$config" "$iface"
 290         config_get aliases "$config" aliases
 291         [ -z "$aliases" ] || uci_set_state network "$config" aliases "$aliases"
 292 }
 293
 294 unbridge() {
 295         local dev="$1"
 296         local brdev
 297
 298         [ -x /usr/sbin/brctl ] || return 0
 299         brctl show | grep "$dev" >/dev/null && {
 300                 # interface is still part of a bridge, correct that
 301
 302                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 303                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 304                 done
 305         }
 306 }