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         }
  65 }
  66
  67 # Create the interface, if necessary.
  68 # Return status 0 indicates that the setup_interface() call should continue
  69 # Return status 1 means that everything is set up already.
  70
  71 prepare_interface() {
  72         local iface="$1"
  73         local config="$2"
  74
  75         # if we're called for the bridge interface itself, don't bother trying
  76         # to create any interfaces here. The scripts have already done that, otherwise
  77         # the bridge interface wouldn't exist.
  78         [ "br-$config" = "$iface" -o -e "$iface" ] && return 0;
  79
  80         ifconfig "$iface" 2>/dev/null >/dev/null && {
  81                 # make sure the interface is removed from any existing bridge and brought down
  82                 ifconfig "$iface" down
  83                 unbridge "$iface"
  84         }
  85
  86         # Setup VLAN interfaces
  87         add_vlan "$iface"
  88         ifconfig "$iface" 2>/dev/null >/dev/null || return 0
  89
  90         # Setup bridging
  91         config_get iftype "$config" type
  92         config_get stp "$config" stp
  93         case "$iftype" in
  94                 bridge)
  95                         [ -x /usr/sbin/brctl ] && {
  96                                 ifconfig "br-$config" 2>/dev/null >/dev/null && {
  97                                         $DEBUG brctl addif "br-$config" "$iface"
  98                                         # Bridge existed already. No further processing necesary
  99                                 } || {
 100                                         $DEBUG brctl addbr "br-$config"
 101                                         $DEBUG brctl setfd "br-$config" 0
 102                                         $DEBUG ifconfig "br-$config" up
 103                                         $DEBUG brctl addif "br-$config" "$iface"
 104                                         $DEBUG brctl stp "br-$config" ${stp:-off}
 105                                         # Creating the bridge here will have triggered a hotplug event, which will
 106                                         # result in another setup_interface() call, so we simply stop processing
 107                                         # the current event at this point.
 108                                 }
 109                                 ifconfig "$iface" up 2>/dev/null >/dev/null
 110                                 return 1
 111                         }
 112                 ;;
 113         esac
 114         return 0
 115 }
 116
 117 set_interface_ifname() {
 118         local config="$1"
 119         local ifname="$2"
 120
 121         config_get device "$1" device
 122         uci_set_state "network.$config.ifname=$ifname"
 123         uci_set_state "network.$config.device=$device"
 124 }
 125
 126 setup_interface() {
 127         local iface="$1"
 128         local config="$2"
 129         local proto
 130         local macaddr
 131
 132         [ -n "$config" ] || {
 133                 config=$(find_config "$iface")
 134                 [ "$?" = 0 ] || return 1
 135         }
 136         proto="${3:-$(config_get "$config" proto)}"
 137
 138         prepare_interface "$iface" "$config" || return 0
 139
 140         [ "$iface" = "br-$config" ] && {
 141                 # need to bring up the bridge and wait a second for
 142                 # it to switch to the 'forwarding' state, otherwise
 143                 # it will lose its routes...
 144                 ifconfig "$iface" up
 145                 sleep 1
 146         }
 147
 148         # Interface settings
 149         config_get mtu "$config" mtu
 150         config_get macaddr "$config" macaddr
 151         grep "$iface:" /proc/net/dev > /dev/null && \
 152                 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
 153         set_interface_ifname "$config" "$iface"
 154
 155         pidfile="/var/run/$iface.pid"
 156         case "$proto" in
 157                 static)
 158                         config_get ipaddr "$config" ipaddr
 159                         config_get netmask "$config" netmask
 160                         config_get ip6addr "$config" ip6addr
 161                         [ -z "$ipaddr" -o -z "$netmask" ] && [ -z "$ip6addr" ] && return 1
 162
 163                         config_get gateway "$config" gateway
 164                         config_get ip6gw "$config" ip6gw
 165                         config_get dns "$config" dns
 166                         config_get bcast "$config" broadcast
 167
 168                         [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask" broadcast "${bcast:-+}"
 169                         [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" add "$ip6addr"
 170                         [ -z "$gateway" ] || $DEBUG route add default gw "$gateway"
 171                         [ -z "$ip6gw" ] || $DEBUG route -A inet6 add default gw "$ip6gw"
 172                         [ -z "$dns" ] || {
 173                                 for ns in $dns; do
 174                                         grep "$ns" /tmp/resolv.conf.auto 2>/dev/null >/dev/null || {
 175                                                 echo "nameserver $ns" >> /tmp/resolv.conf.auto
 176                                         }
 177                                 done
 178                         }
 179
 180                         env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
 181                 ;;
 182                 dhcp)
 183                         # prevent udhcpc from starting more than once
 184                         lock "/var/lock/dhcp-$iface"
 185                         pid="$(cat "$pidfile" 2>/dev/null)"
 186                         [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null && {
 187                                 lock -u "/var/lock/dhcp-$iface"
 188                                 return 0
 189                         }
 190
 191                         config_get ipaddr "$config" ipaddr
 192                         config_get netmask "$config" netmask
 193                         config_get hostname "$config" hostname
 194                         config_get proto1 "$config" proto
 195                         config_get clientid "$config" clientid
 196
 197                         [ -z "$ipaddr" ] || \
 198                                 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
 199
 200                         # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
 201                         [ ."$proto1" != ."$proto" ] && dhcpopts="-n -q"
 202                         $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} ${clientid:+-c $clientid} -b -p "$pidfile" ${dhcpopts:- -R &}
 203                         lock -u "/var/lock/dhcp-$iface"
 204                 ;;
 205                 *)
 206                         if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
 207                                 eval "setup_interface_$proto '$iface' '$config' '$proto'"
 208                         else
 209                                 echo "Interface type $proto not supported."
 210                                 return 1
 211                         fi
 212                 ;;
 213         esac
 214 }
 215
 216 unbridge() {
 217         local dev="$1"
 218         local brdev
 219
 220         [ -x /usr/sbin/brctl ] || return 0
 221         brctl show | grep "$dev" >/dev/null && {
 222                 # interface is still part of a bridge, correct that
 223
 224                 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
 225                         brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
 226                 done
 227         }
 228 }