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 mode iftype iface ifname device
  28         interfaces=
  29         config_cb() {
  30                 case "$1" in
  31                         interface)
  32                                 config_set "$2" auto 1
  33                         ;;
  34                 esac
  35                 config_get iftype "$CONFIG_SECTION" TYPE
  36                 case "$iftype" in
  37                         interface)
  38                                 config_get proto "$CONFIG_SECTION" proto
  39                                 append interfaces "$CONFIG_SECTION"
  40                                 config_get iftype "$CONFIG_SECTION" type
  41                                 config_get ifname "$CONFIG_SECTION" ifname
  42                                 config_set "$CONFIG_SECTION" device "$ifname"
  43                                 case "$iftype" in
  44                                         bridge)
  45                                                 config_set "$CONFIG_SECTION" ifnames "$ifname"
  46                                                 config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
  47                                         ;;
  48                                 esac
  49                                 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
  50                         ;;
  51                 esac
  52         }
  53         config_load network
  54 }
  55
  56 add_vlan() {
  57         local vif="${1%\.*}"
  58
  59         [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
  60                 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
  61                 $DEBUG vconfig add "$vif" "${1##*\.}"
  62         }
  63 }
  64
  65 # Create the interface, if necessary.
  66 # Return status 0 indicates that the setup_interface() call should continue
  67 # Return status 1 means that everything is set up already.
  68
  69 prepare_interface() {
  70         local iface="$1"
  71         local config="$2"
  72
  73         # if we're called for the bridge interface itself, don't bother trying
  74         # to create any interfaces here. The scripts have already done that, otherwise
  75         # the bridge interface wouldn't exist.
  76         [ "$iface" = "br-$config" ] && return 0;
  77
  78         ifconfig "$iface" 2>/dev/null >/dev/null && {
  79                 # make sure the interface is removed from any existing bridge and brought down
  80                 ifconfig "$iface" down
  81                 unbridge "$iface"
  82         }
  83
  84         # Setup VLAN interfaces
  85         add_vlan "$iface"
  86
  87         # Setup bridging
  88         config_get iftype "$config" type
  89         case "$iftype" in
  90                 bridge)
  91                         [ -x /usr/sbin/brctl ] && {
  92                                 ifconfig "$iface" up 2>/dev/null >/dev/null
  93                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
  94                                         $DEBUG brctl addif "br-$config" "$iface"
  95                                         # Bridge existed already. No further processing necesary
  96                                 } || {
  97                                         $DEBUG brctl addbr "br-$config"
  98                                         $DEBUG brctl setfd "br-$config" 0
  99                                         $DEBUG brctl addif "br-$config" "$iface"
 100                                         # Creating the bridge here will have triggered a hotplug event, which will
 101                                         # result in another setup_interface() call, so we simply stop processing
 102                                         # the current event at this point.
 103                                 }
 104                                 return 1
 105                         }
 106                 ;;
 107         esac
 108         return 0
 109 }
 110
 111 setup_interface() {
 112         local iface="$1"
 113         local config="$2"
 114         local proto
 115         local macaddr
 116
 117         [ -n "$config" ] || {
 118                 config=$(find_config "$iface")
 119                 [ "$?" = 0 ] || return 1
 120         }
 121         proto="${3:-$(config_get "$config" proto)}"
 122
 123         prepare_interface "$iface" "$config" || return 0
 124
 125         [ "$iface" = "br-$config" ] && {
 126                 # need to bring up the bridge and wait a second for
 127                 # it to switch to the 'forwarding' state, otherwise
 128                 # it will lose its routes...
 129                 ifconfig "$iface" up
 130                 sleep 1
 131         }
 132
 133         # Interface settings
 134         config_get mtu "$config" mtu
 135         config_get macaddr "$config" macaddr
 136         $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 137
 138         pidfile="/var/run/$iface.pid"
 139         case "$proto" in
 140                 static)
 141                         config_get ipaddr "$config" ipaddr
 142                         config_get netmask "$config" netmask
 143                         [ -z "$ipaddr" -o -z "$netmask" ] && return 1
 144
 145                         config_get ip6addr "$config" ip6addr
 146                         config_get gateway "$config" gateway
 147                         config_get dns "$config" dns
 148                         config_get bcast "$config" broadcast
 149
 150                         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask"
 151                         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" inet6 add "$ip6addr"
 152                         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway"
 153                         [ -z "$bcast" ] || $DEBUG ifconfig "$iface" broadcast "$bcast"
 154                         [ -z "$dns" -o -f /tmp/resolv.conf.auto ] || {
 155                                 for ns in $dns; do
 156                                         echo "nameserver $ns" >> /tmp/resolv.conf.auto
 157                                 done
 158                         }
 159
 160                         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug "iface" &
 161                 ;;
 162                 dhcp)
 163                         # prevent udhcpc from starting more than once
 164                         lock "/var/lock/dhcp-$iface"
 165                         pid="$(cat "$pidfile" 2>/dev/null)"
 166                         [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null && {
 167                                 lock -u "/var/lock/dhcp-$iface"
 168                                 return 0
 169                         }
 170
 171                         config_get ipaddr "$config" ipaddr
 172                         config_get netmask "$config" netmask
 173                         config_get hostname "$config" hostname
 174                         config_get proto1 "$config" proto
 175
 176                         [ -z "$ipaddr" ] || \
 177                                 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 178
 179                         # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 180                         [ "$proto1" != "$proto" ] && dhcpopts="-n -q"
 181                         $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} -b -p "$pidfile" ${dhcpopts:- -R &}
 182                         lock -u "/var/lock/dhcp-$iface"
 183                 ;;
 184                 *)
 185                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 186                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 187                         else
 188                                 echo "Interface type $proto not supported."
 189                                 return 1
 190                         fi
 191                 ;;
 192         esac
 193 }
 194
 195 unbridge() {
 196         local dev="$1"
 197         local brdev
 198
 199         [ -x /usr/sbin/brctl ] || return 0
 200         brctl show | grep "$dev" >/dev/null && {
 201                 # interface is still part of a bridge, correct that
 202
 203                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 204                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 205                 done
 206         }
 207 }