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="$2"
  86
  87         # if we're called for the bridge interface itself, don't bother trying
  88         # to create any interfaces here. The scripts have already done that, otherwise
  89         # the bridge interface wouldn't exist.
  90         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
  91
  92         ifconfig "$iface" 2>/dev/null >/dev/null && {
  93                 # make sure the interface is removed from any existing bridge and brought down
  94                 ifconfig "$iface" down
  95                 unbridge "$iface"
  96         }
  97
  98         # Setup VLAN interfaces
  99         add_vlan "$iface" && return 1
 100         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
 101
 102         # Setup bridging
 103         config_get iftype "$config" type
 104         config_get stp "$config" stp
 105         case "$iftype" in
 106                 bridge)
 107                         [ -x /usr/sbin/brctl ] && {
 108                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
 109                                         local newdevs=
 110
 111                                         config_get devices "$config" device
 112                                         for dev in $(sort_list "$devices" "$iface"); do
 113                                                 append newdevs "$dev"
 114                                         done
 115                                         uci_set_state network "$config" device "$newdevs"
 116                                         $DEBUG brctl addif "br-$config" "$iface"
 117                                         # Bridge existed already. No further processing necesary
 118                                 } || {
 119                                         $DEBUG brctl addbr "br-$config"
 120                                         $DEBUG brctl setfd "br-$config" 0
 121                                         $DEBUG ifconfig "br-$config" up
 122                                         $DEBUG brctl addif "br-$config" "$iface"
 123                                         $DEBUG brctl stp "br-$config" ${stp:-off}
 124                                         # Creating the bridge here will have triggered a hotplug event, which will
 125                                         # result in another setup_interface() call, so we simply stop processing
 126                                         # the current event at this point.
 127                                 }
 128                                 ifconfig "$iface" up 2>/dev/null >/dev/null
 129                                 return 1
 130                         }
 131                 ;;
 132         esac
 133         return 0
 134 }
 135
 136 set_interface_ifname() {
 137         local config="$1"
 138         local ifname="$2"
 139
 140         config_get device "$1" device
 141         uci_set_state network "$config" ifname "$ifname"
 142         uci_set_state network "$config" device "$device"
 143 }
 144
 145 setup_interface_static() {
 146         local iface="$1"
 147         local config="$2"
 148
 149         config_get ipaddr "$config" ipaddr
 150         config_get netmask "$config" netmask
 151         config_get ip6addr "$config" ip6addr
 152         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 153
 154         config_get gateway "$config" gateway
 155         config_get ip6gw "$config" ip6gw
 156         config_get dns "$config" dns
 157         config_get bcast "$config" broadcast
 158
 159         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 160         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 161         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway" dev "$iface"
 162         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw" dev "$iface"
 163         [ -z "$dns" ] || {
 164                 for ns in $dns; do
 165                         grep "$ns" /tmp/resolv.conf.auto 2>/dev/null >/dev/null || {
 166                                 echo "nameserver $ns" >> /tmp/resolv.conf.auto
 167                         }
 168                 done
 169         }
 170
 171         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 172 }
 173
 174 setup_interface_alias() {
 175         local config="$1"
 176         local parent="$2"
 177         local iface="$3"
 178
 179         config_get cfg "$config" interface
 180         [ "$parent" == "$cfg" ] || return 0
 181
 182         # alias counter
 183         config_get ctr "$parent" alias_count
 184         ctr="$(($ctr + 1))"
 185         config_set "$parent" alias_count "$ctr"
 186
 187         # alias list
 188         config_get list "$parent" aliases
 189         append list "$config"
 190         config_set "$parent" aliases "$list"
 191
 192         set_interface_ifname "$config" "$iface:$ctr"
 193         config_get proto "$config" proto
 194         case "${proto:-static}" in
 195                 static)
 196                         setup_interface_static "$iface:$ctr" "$config"
 197                 ;;
 198                 *)
 199                         echo "Unsupported type '$proto' for alias config '$config'"
 200                         return 1
 201                 ;;
 202         esac
 203 }
 204
 205 setup_interface() {
 206         local iface="$1"
 207         local config="$2"
 208         local proto
 209         local macaddr
 210
 211         [ -n "$config" ] || {
 212                 config=$(find_config "$iface")
 213                 [ "$?" = 0 ] || return 1
 214         }
 215         proto="${3:-$(config_get "$config" proto)}"
 216
 217         prepare_interface "$iface" "$config" || return 0
 218
 219         [ "$iface" = "br-$config" ] && {
 220                 # need to bring up the bridge and wait a second for
 221                 # it to switch to the 'forwarding' state, otherwise
 222                 # it will lose its routes...
 223                 ifconfig "$iface" up
 224                 sleep 1
 225         }
 226
 227         # Interface settings
 228         config_get mtu "$config" mtu
 229         config_get macaddr "$config" macaddr
 230         grep "$iface:" /proc/net/dev > /dev/null && \
 231                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 232         set_interface_ifname "$config" "$iface"
 233
 234         pidfile="/var/run/$iface.pid"
 235         case "$proto" in
 236                 static)
 237                         setup_interface_static "$iface" "$config"
 238                 ;;
 239                 dhcp)
 240                         # prevent udhcpc from starting more than once
 241                         lock "/var/lock/dhcp-$iface"
 242                         pid="$(cat "$pidfile" 2>/dev/null)"
 243                         if [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null; then
 244                                 lock -u "/var/lock/dhcp-$iface"
 245                         else
 246
 247                                 config_get ipaddr "$config" ipaddr
 248                                 config_get netmask "$config" netmask
 249                                 config_get hostname "$config" hostname
 250                                 config_get proto1 "$config" proto
 251                                 config_get clientid "$config" clientid
 252
 253                                 [ -z "$ipaddr" ] || \
 254                                         $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 255
 256                                 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 257                                 [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 258                                 $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} ${clientid:+-c $clientid} -b -p "$pidfile" ${dhcpopts:- -R &}
 259                                 lock -u "/var/lock/dhcp-$iface"
 260                         fi
 261                 ;;
 262                 *)
 263                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 264                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 265                         else
 266                                 echo "Interface type $proto not supported."
 267                                 return 1
 268                         fi
 269                 ;;
 270         esac
 271         config_set "$config" aliases ""
 272         config_set "$config" alias_count 0
 273         config_foreach setup_interface_alias alias "$config" "$iface"
 274         config_get aliases "$config" aliases
 275         [ -z "$aliases" ] || uci_set_state network "$config" aliases "$aliases"
 276 }
 277
 278 unbridge() {
 279         local dev="$1"
 280         local brdev
 281
 282         [ -x /usr/sbin/brctl ] || return 0
 283         brctl show | grep "$dev" >/dev/null && {
 284                 # interface is still part of a bridge, correct that
 285
 286                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 287                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 288                 done
 289         }
 290 }