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xen/network-multinet

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#!/bin/sh
#============================================================================
# network-multinet
#
# Version = 2.0.1
# Date = 2007-11-29
#
# Maintainer(s) = Ron Terry - ron (at) pronetworkconsulting (dot) com
#
# The latest version can be found at:
#
# http://pronetworkconsulting.com/linux/scripts/network-multinet.html
#
# Description:
#
# Replacement for the xen network-bridge, network-nat and network-route
# scripts. This script allows for the creation of multiple networks.
#
# This script can create 4 types of networks:
#
# bridged: -Networks that contain both a physical network device (ethX)
# and a virtual network device (vethX) from Dom0.
# -This is the traditional type of network created in xen by
# the basic network-bridge script.
# -VMs on these network(s) appear to be on the real network(s)
#
# nohost: -Networks that contain a physical network device but not a
# virtual network device from Dom0.
# -These can be used to allow virtual machines to communicate
# with the outside world but not with Dom0.
# (Usefull if you want to isolate traffic away from Dom0)
#
# hostonly: -Networks that contain only a virtual network device (vethX)
# from Dom0.
# -This type of network will allow VMs connected to it to
# access only Dom0 and other VMs connected to the network.
# -This type of network is similiar to a VMware "HOST ONLY"
# network.
#
# nat: -Networks that contain only a virtual network device (vethX)
# from Dom0.
# -This type of network will allow VMs connected to it to access
# Dom0,the "outside world" via NAT and other VMs connected to it.
# -This type of network is similiar to a VMware "NAT" network.
#
# routed: -Networks that contain only a virtual network device (vethX)
# from Dom0.
# -This type of network will allow VMs connected to it to access
# Dom0,the "outside world" via routing through Dom0 and other VMs
# connected to it.
#
# empty: -Networks that do not contain any physical or virtual network
# devices from Dom0.
# -These can be used to allow VMs in DomUs to communicate only
# with other DomUs and not Dom0.
#
#
# This script accepts the (start|stop|restart|status) parameters.
#
# This script requires that the vif-bridge script be used as the vif
# creation script (as opposed to vif-nat/vif-route).
#
# This script will test for the presence of the physical interfaces
# configured to be connected to bridged networks and only attempt to
# create networks on the ones that are present and up. It will also test
# for the presence of virtual interfaces configured to be connected to
# other networks and only create networks for the ones that exist and
# are not already connected to an existing network.
#
# Edit the NETWORK_LIST variable to define which networks to create on which
# interfaces. The default is to create a bridged network on the first
# interface active network interface.
#
# To enable this script edit the network-script field in the
# /etc/xen/xend-config.sxp file.
#
# Example: (network-script network-multinet)
#
# Depends on: $SCRIPT_PATH/multinet-common.sh
#
# Calls if present: $SCRIPT_PATH/xen-dhcpd
#
# Config file: /etc/sysconfig/xend
#
# Usage: network-multinet (start|stop|restart|status)
#
# Vars:
#
# --------------------------- In this script ----------------------------
# SCRIPT_PATH -Path to the directory containing the xen network-bridge
# script (typically /etc/xen/scripts)
#
# CONFIG_FILE_PATH -Path to extra config files
# (not used currently by this script)
#
# NETWORK_SAVE_PATH -Path to save network configuration information in
#
# IPTABLES_SAVE_FILE -File in which to save backed-up iptables rules so that they
# may be restored when the script is stopped
#
# XEN_DHCP_SCRIPT -Script called to manage the DHCP server on the specified networks
#
# ------------------------- In the config file --------------------------
# NETWORK_LIST -Space delimited list of network devices to create networks
# on using the following format:
#
# <network type>,<number of network type>,<network device>,<mac address>,<IP address/CIDR NetMask>,<dhcp server status>
#
# Example with 3 virtual devices:
#
# "bridge,0,eth0,,,dhcp-off nat,0,veth2,00:16:3E:01:00:03,172.23.0.1/16,dhcp-off hostonly,0,veth3,00:16:3E:01:00:03,172.23.0.1/16,dhcp-off"
#
# NAT_EXTERNAL_INTERFACE -Network interface to use as the external interface
# for NATed and Routed networks
#
#============================================================================
#### Read config files and set variables ##################################
# Source the configuration File
. /etc/sysconfig/xend
SCRIPT_PATH="/etc/xen/scripts"
CONF_FILE_PATH="/etc/xen/conf"
NETWORK_SAVE_PATH="/var/lib/xend/network_save"
IPTABLES_SAVE_FILE="$NETWORK_SAVE_PATH/iptables-save"
XEN_DHCP_SCRIPT="$SCRIPT_PATH/xen-dhcpd"
#### Script Functions #####################################################
usage() {
# Gives hlep about usage parameters
echo "Usage: $0 {start|stop|restart|status}"
exit 1
}
get_option() {
# Determine which option was passed from the command line.
case "$1" in
start|stop|restart|status)
CMD_OPT="$1"
;;
*)
usage
;;
esac
}
make_config_dirs() {
# Create temporary storage directory if needed.
if ! [ -d "$NETWORK_SAVE_PATH" ]
then
mkdir $NETWORK_SAVE_PATH
fi
if ! [ -d $CONF_FILE_PATH ]
then
mkdir $CONF_FILE_PATH
fi
}
. $SCRIPT_PATH/multinet-common.sh
#***** Network Creation Main Function *************************************
create_networks() {
VIF_COUNT=0
case $NAT_EXTERNAL_INTERFACE in
default)
NAT_EXTERNAL_INTERFACE=`ip route list | awk '/^default / { print $NF }'`
;;
esac
for NETWORK in $NETWORK_LIST
do
local NET_TYPE=`echo $NETWORK | cut -d "," -f 1`
local NET_NUMBER=`echo $NETWORK | cut -d "," -f 2`
local NET_DEV=`echo $NETWORK | cut -d "," -f 3`
local NET_DEV_MAC=`echo $NETWORK | cut -d "," -f 4`
local NET_DEV_IP=`echo $NETWORK | cut -d "," -f 5`
local NET_DHCP_SRV=`echo $NETWORK | cut -d "," -f 6`
case $NET_DEV in
default)
local NET_DEV=`ip route list | awk '/^default / { print $NF }'`
;;
esac
case $NET_TYPE in
bridge)
create_bridged_networks $NET_DEV $NET_NUMBER
((VIF_COUNT++))
;;
nat|route|hostonly)
create_local_networks $NET_DEV $NET_TYPE $NET_NUMBER $NET_DEV_MAC $NET_DEV_IP $NET_DHCP_SRV
((VIF_COUNT++))
;;
nohost)
create_nohost_networks $NET_DEV $NET_NUMBER
;;
empty)
create_empty_networks $NET_NUMBER
;;
esac
done
}
#### Start, Stop, Status Functions ########################################
start_xend_network() {
echo ""
echo "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"
echo " Starting the xend network environment"
echo "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"
make_config_dirs
manage_susefirewall2 stop || manage_iptables stop
#manage_susefirewall2 start
manage_routing start
create_networks
}
stop_xend_network() {
echo ""
echo "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"
echo " Stopping the xend network environment"
echo "%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%"
manage_susefirewall2 stop
create_networks
manage_routing stop
manage_susefirewall2 start || manage_iptables start
}
show_xend_network_status() {
create_networks
}
#### Main Code Body #######################################################
get_option "$1"
case $CMD_OPT in
start)
# Start the Xen network
start_xend_network
# Start the DHCP server if it exists
if [ -e $XEN_DHCP_SCRIPT ]
then
$XEN_DHCP_SCRIPT start
fi
;;
stop)
# Stop the DHCP server if it exists
if [ -e $XEN_DHCP_SCRIPT ]
then
$XEN_DHCP_SCRIPT stop
fi
# Stop the Xen network
stop_xend_network
;;
restart)
# Stop the DHCP server if it exists
if [ -e $XEN_DHCP_SCRIPT ]
then
$XEN_DHCP_SCRIPT stop
fi
# Stop the Xen network
CMD_OPT="stop"
stop_xend_network
# Start the Xen network
CMD_OPT="start"
start_xend_network
# Start the DHCP server if it exists
if [ -e $XEN_DHCP_SCRIPT ]
then
$XEN_DHCP_SCRIPT start
fi
;;
status)
show_xend_network_status
if [ -e $XEN_DHCP_SCRIPT ]
then
$XEN_DHCP_SCRIPT status
fi
;;
esac
exit 0
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