utilities/ovs-save

   1 #! /bin/sh
   2
   3 # Copyright (c) 2011 Nicira Networks, Inc.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at:
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 if test "X$1" = X--help; then
  18     cat <<EOF
  19 $0: saves the kernel configuration of network interfaces
  20 usage: $0 NETDEV...
  21
  22 Outputs a shell script on stdout that will restore the current
  23 kernel configuration of the specified network interfaces, as
  24 well as the system iptables configuration.
  25
  26 This script is meant as a helper for the Open vSwitch init
  27 script "force-reload-kmod" command.
  28 EOF
  29     exit 0
  30 fi
  31
  32 PATH=/sbin:/bin:/usr/sbin:/usr/bin
  33
  34 missing_program () {
  35     save_IFS=$IFS
  36     IFS=:
  37     for dir in $PATH; do
  38         IFS=$save_IFS
  39         if test -x $dir/$1; then
  40             return 1
  41         fi
  42     done
  43     IFS=$save_IFS
  44     return 0
  45 }
  46 if missing_program ip; then
  47     echo "$0: ip not found in $PATH" >&2
  48     exit 1
  49 fi
  50
  51 if test "$#" = 0; then
  52     echo "# $0: no parameters given (use \"$0 --help\" for help)"
  53 fi
  54
  55 devs=$*
  56 for dev in $devs; do
  57     state=`ip link show $dev` || continue
  58
  59     echo "# $dev"
  60     # Link state (Ethernet addresses, up/down, ...)
  61     linkcmd=
  62     case $state in
  63         *"state UP"* | *[,\<]"UP"[,\>]* )
  64             linkcmd="$linkcmd up"
  65             ;;
  66         *"state DOWN"*)
  67             linkcmd="$linkcmd down"
  68             ;;
  69     esac
  70     if expr "$state" : '.*\bdynamic\b' > /dev/null; then
  71         linkcmd="$linkcmd dynamic"
  72     fi
  73     if qlen=`expr "$state" : '.*qlen \([0-9]+\)'`; then
  74         linkcmd="$linkcmd txqueuelen $qlen"
  75     fi
  76     if hwaddr=`expr "$state" : '.*link/ether \([^ ]*\)'`; then
  77         linkcmd="$linkcmd address $hwaddr"
  78     fi
  79     if brd=`expr "$state" : '.*brd \([^ ]*\)'`; then
  80         linkcmd="$linkcmd broadcast $brd"
  81     fi
  82     if mtu=`expr "$state" : '.*mtu \([0-9]+\)'`; then
  83         linkcmd="$linkcmd mtu $mtu"
  84     fi
  85     if test -n "$linkcmd"; then
  86         echo ip link set $dev down # Required to change hwaddr.
  87         echo ip link set $dev $linkcmd
  88     fi
  89
  90     # IP addresses (including IPv6).
  91     echo "ip addr flush $dev 2>/dev/null" # Suppresses "Nothing to flush".
  92     ip addr show dev $dev | while read addr; do
  93         set -- $addr
  94
  95         # Check and trim family.
  96         family=$1
  97         shift
  98         case $family in
  99             inet | inet6) ;;
 100             *) continue ;;
 101         esac
 102
 103         # Trim device off the end--"ip" insists on having "dev" precede it.
 104         addrcmd=
 105         while test $# != 0; do
 106             case $1 in
 107                 dynamic)
 108                     # Omit kernel-maintained route.
 109                     continue 2
 110                     ;;
 111                 scope)
 112                     if test "$2" = link; then
 113                         # Omit route derived from IP address, e.g.
 114                         # 172.16.0.0/16 derived from 172.16.12.34.
 115                         continue 2
 116                     fi
 117                     ;;
 118                 "$dev"|"$dev:"*)
 119                     # Address label string
 120                     addrcmd="$addrcmd label $1"
 121                     shift
 122                     continue
 123                     ;;
 124             esac
 125             addrcmd="$addrcmd $1"
 126             shift
 127         done
 128         if test "$1" != "$dev"; then
 129             addrcmd="$addrcmd $1"
 130         fi
 131
 132         echo ip -f $family addr add $addrcmd dev $dev
 133     done
 134
 135     # Routes.
 136     echo "ip route flush dev $dev proto boot 2>/dev/null" # Suppresses "Nothing to flush".
 137     ip route show dev $dev | while read route; do
 138         # "proto kernel" routes are installed by the kernel automatically.
 139         case $route in
 140             *" proto kernel "*) continue ;;
 141         esac
 142
 143         echo "ip route add $route dev $dev"
 144     done
 145
 146     echo
 147 done
 148
 149 if missing_program iptables-save; then
 150     echo "# iptables-save not found in $PATH, not saving iptables state"
 151 else
 152     echo "# global"
 153     echo "iptables-restore <<'EOF'"
 154     iptables-save
 155     echo "EOF"
 156 fi
 157
 158 exit 0