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 "$CONFIG_SECTION" ifname
  43                                 config_set "$CONFIG_SECTION" device "$ifname"
  44                                 case "$iftype" in
  45                                         bridge)
  46                                                 config_set "$CONFIG_SECTION" ifnames "$ifname"
  47                                                 config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
  48                                         ;;
  49                                 esac
  50                                 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
  51                         ;;
  52                 esac
  53         }
  54         config_load "${cfgfile:-network}"
  55 }
  56
  57 add_vlan() {
  58         local vif="${1%\.*}"
  59
  60         [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
  61                 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
  62                 $DEBUG vconfig add "$vif" "${1##*\.}"
  63         }
  64 }
  65
  66 # Create the interface, if necessary.
  67 # Return status 0 indicates that the setup_interface() call should continue
  68 # Return status 1 means that everything is set up already.
  69
  70 prepare_interface() {
  71         local iface="$1"
  72         local config="$2"
  73
  74         # if we're called for the bridge interface itself, don't bother trying
  75         # to create any interfaces here. The scripts have already done that, otherwise
  76         # the bridge interface wouldn't exist.
  77         [ "$iface" = "br-$config" ] && return 0;
  78
  79         [ -f "$iface" ] && return 0;
  80
  81         ifconfig "$iface" 2>/dev/null >/dev/null && {
  82                 # make sure the interface is removed from any existing bridge and brought down
  83                 ifconfig "$iface" down
  84                 unbridge "$iface"
  85         }
  86
  87         # Setup VLAN interfaces
  88         add_vlan "$iface"
  89         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
  90
  91         # Setup bridging
  92         config_get iftype "$config" type
  93         case "$iftype" in
  94                 bridge)
  95                         [ -x /usr/sbin/brctl ] && {
  96                                 ifconfig "$iface" up 2>/dev/null >/dev/null
  97                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
  98                                         $DEBUG brctl addif "br-$config" "$iface"
  99                                         # Bridge existed already. No further processing necesary
 100                                 } || {
 101                                         $DEBUG brctl addbr "br-$config"
 102                                         $DEBUG brctl setfd "br-$config" 0
 103                                         $DEBUG brctl addif "br-$config" "$iface"
 104                                         # Creating the bridge here will have triggered a hotplug event, which will
 105                                         # result in another setup_interface() call, so we simply stop processing
 106                                         # the current event at this point.
 107                                 }
 108                                 return 1
 109                         }
 110                 ;;
 111         esac
 112         return 0
 113 }
 114
 115 setup_interface() {
 116         local iface="$1"
 117         local config="$2"
 118         local proto
 119         local macaddr
 120
 121         [ -n "$config" ] || {
 122                 config=$(find_config "$iface")
 123                 [ "$?" = 0 ] || return 1
 124         }
 125         proto="${3:-$(config_get "$config" proto)}"
 126
 127         prepare_interface "$iface" "$config" || return 0
 128
 129         [ "$iface" = "br-$config" ] && {
 130                 # need to bring up the bridge and wait a second for
 131                 # it to switch to the 'forwarding' state, otherwise
 132                 # it will lose its routes...
 133                 ifconfig "$iface" up
 134                 sleep 1
 135         }
 136
 137         # Interface settings
 138         config_get mtu "$config" mtu
 139         config_get macaddr "$config" macaddr
 140         $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 141
 142         pidfile="/var/run/$iface.pid"
 143         case "$proto" in
 144                 static)
 145                         config_get ipaddr "$config" ipaddr
 146                         config_get netmask "$config" netmask
 147                         [ -z "$ipaddr" -o -z "$netmask" ] && return 1
 148
 149                         config_get ip6addr "$config" ip6addr
 150                         config_get gateway "$config" gateway
 151                         config_get dns "$config" dns
 152                         config_get bcast "$config" broadcast
 153
 154                         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask"
 155                         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" inet6 add "$ip6addr"
 156                         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway"
 157                         [ -z "$bcast" ] || $DEBUG ifconfig "$iface" broadcast "$bcast"
 158                         [ -z "$dns" -o -f /tmp/resolv.conf.auto ] || {
 159                                 for ns in $dns; do
 160                                         echo "nameserver $ns" >> /tmp/resolv.conf.auto
 161                                 done
 162                         }
 163
 164                         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 165                 ;;
 166                 dhcp)
 167                         # prevent udhcpc from starting more than once
 168                         lock "/var/lock/dhcp-$iface"
 169                         pid="$(cat "$pidfile" 2>/dev/null)"
 170                         [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null && {
 171                                 lock -u "/var/lock/dhcp-$iface"
 172                                 return 0
 173                         }
 174
 175                         config_get ipaddr "$config" ipaddr
 176                         config_get netmask "$config" netmask
 177                         config_get hostname "$config" hostname
 178                         config_get proto1 "$config" proto
 179
 180                         [ -z "$ipaddr" ] || \
 181                                 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 182
 183                         # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 184                         [ "$proto1" != "$proto" ] && dhcpopts="-n -q"
 185                         $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} -b -p "$pidfile" ${dhcpopts:- -R &}
 186                         lock -u "/var/lock/dhcp-$iface"
 187                 ;;
 188                 *)
 189                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 190                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 191                         else
 192                                 echo "Interface type $proto not supported."
 193                                 return 1
 194                         fi
 195                 ;;
 196         esac
 197 }
 198
 199 unbridge() {
 200         local dev="$1"
 201         local brdev
 202
 203         [ -x /usr/sbin/brctl ] || return 0
 204         brctl show | grep "$dev" >/dev/null && {
 205                 # interface is still part of a bridge, correct that
 206
 207                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 208                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 209                 done
 210         }
 211 }