modules.d/40network/ifup

   1 #!/bin/sh
   2 #
   3 # We don't need to check for ip= errors here, that is handled by the
   4 # cmdline parser script
   5 #
   6
   7 # Sadly there's no easy way to split ':' separated lines into variables
   8 ip_to_var() {
   9     local v=${1}:
  10     set --
  11     while [ -n "$v" ]; do
  12         set -- "$@" "${v%%:*}"
  13         v=${v#*:}
  14     done
  15
  16     unset ip srv gw mask hostname dev autoconf
  17     case $# in
  18     0)  autoconf="error" ;;
  19     1)  autoconf=$1 ;;
  20     2)  dev=$1; autoconf=$2 ;;
  21     *)  ip=$1; srv=$2; gw=$3; mask=$4; hostname=$5; dev=$6; autoconf=$7 ;;
  22     esac
  23 }
  24
  25 # Run dhclient
  26 do_dhcp() {
  27     # /sbin/dhclient-script will mark the netif up and generate the online
  28     # event for nfsroot
  29     # XXX add -V vendor class and option parsing per kernel
  30     dhclient -1 -q -cf /etc/dhclient.conf -pf /tmp/dhclient.$netif.pid -lf /tmp/dhclient.$netif.lease $netif
  31 }
  32
  33 # Handle static ip configuration
  34 do_static() {
  35 {
  36         echo ip link set $netif up
  37         echo ip addr flush dev $netif
  38         echo ip addr add $ip/$mask dev $netif
  39     } > /tmp/net.$netif.up
  40
  41     [ -n "$gw" ] && echo ip route add default via $gw dev $netif > /tmp/net.$netif.gw
  42     [ -n "$hostname" ] && echo hostname $hostname > /tmp/net.$netif.hostname
  43
  44     echo online > /sys/class/net/$netif/uevent
  45 }
  46
  47 PATH=$PATH:/sbin:/usr/sbin
  48
  49 . /lib/dracut-lib.sh
  50
  51 if getarg rdnetdebug ; then
  52     exec >/tmp/ifup.$1.$$.out
  53     exec 2>>/tmp/ifup.$1.$$.out
  54     set -x
  55 fi
  56
  57 # Huh? No $1?
  58 [ -z "$1" ] && exit 1
  59
  60 # $netif reads easier than $1
  61 netif=$1
  62
  63 # bridge this interface?
  64 if [ -e /tmp/bridge.info ]; then
  65     . /tmp/bridge.info
  66     if [ "$netif" = "$ethname" ]; then
  67         netif="$bridgename"
  68     fi
  69 fi
  70
  71 # bail immediately if the interface is already up
  72 # or we don't need the network
  73 [ -f "/tmp/net.$netif.up" ] && exit 0
  74 [ -f "/tmp/root.info" ] || exit 0
  75 . /tmp/root.info
  76 [ -z "$netroot" ] && exit 0
  77
  78 # loopback is always handled the same way
  79 if [ "$netif" = "lo" ] ; then
  80     ip link set lo up
  81     ip addr add 127.0.0.1/8 dev lo
  82     >/tmp/net.$netif.up
  83     exit 0
  84 fi
  85
  86 # XXX need error handling like dhclient-script
  87
  88 # start bridge if necessary
  89 if [ "$netif" = "$bridgename" ] && [ ! -e /tmp/net.$bridgename.up ]; then
  90     ip link set $ethname up
  91     # Create bridge and add eth to bridge
  92     brctl addbr $bridgename
  93     brctl setfd $bridgename 0
  94     brctl addif $bridgename $ethname
  95 fi
  96
  97 # No ip lines default to dhcp
  98 ip=$(getarg ip)
  99 [ -z "$ip" ] && do_dhcp;
 100
 101 # Specific configuration, spin through the kernel command line
 102 # looking for ip= lines
 103 [ "$CMDLINE" ] || read CMDLINE </proc/cmdline;
 104 for p in $CMDLINE; do
 105     [ -n "${p%ip=*}" ] && continue
 106     ip_to_var ${p#ip=}
 107
 108     # If this option isn't directed at our interface, skip it
 109     [ -n "$dev" ] && [ "$dev" != "$netif" ] && continue
 110
 111     # Store config for later use
 112     for i in ip srv gw mask hostname; do
 113         eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
 114     done > /tmp/net.$netif.override
 115
 116     case $autoconf in
 117         dhcp|on|any)     do_dhcp ;;
 118         *) do_static ;;
 119     esac
 120     break
 121 done
 122 exit 0