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network-multi
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network-multi
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#!/bin/sh
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#============================================================================
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# network-multi
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#
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# Version = 1.0.0
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# Date = 2007-05-12
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#
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# Maintainer(s) = Ron Terry - ron (at) pronetworkconsulting (dot) com
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#
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# The latest version can be found at:
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#
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# http://pronetworkconsulting.com/linux/scripts/network-multi.html
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#
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# Description:
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#
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# Replacement for the xen network-bridge, network-nat and network-route
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# scripts. This script allows for the creation of multiple bridges.
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#
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# This script can create 3 types of bridges:
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#
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# traditional bridges: -Bridges that contain both a physical network
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# device (ethX) and a virtual network device (vethX)
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# from Dom0.
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# -This is the traditional type of network bridge
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# created in xen by the network-bridge script.
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#
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# host bridges: -Bridges that contain only a virtual network
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# device (vethX) from Dom0.
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# -These bridges can be configured in the
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# following ways:
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#
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# -hostonly: This type of bridge will allow
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# VMs connected to these networks
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# to access only Dom0 and other
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# VMs connected to the bridge.
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# This type of bridge is similiar to
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# a VMware "HOST ONLY" network.
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#
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# -nat: This type of bridge will allow
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# VMs connected to these networks
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# to access the "outside world"
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# via NAT and other VMs connected
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# to the bridge.
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# This type of bridge is similiar to
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# a VMware "NAT" network.
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#
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# -routed: This type of bridge will allow
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# to access the "outside world"
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# via routing through Dom0 and
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# other VMs connected to the
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# bridge.
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#
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# empty bridges: -Bridges that do not contain any physical or
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# virtual network devices from Dom0.
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# -These can be used to allow VMs in DomUs to
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# communicate only with other DomUs and not Dom0.
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#
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# This script accepts the (start|stop|status) parameters. If not specified
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# it sends the start parameter.
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#
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# This script depends on an unmodified version of the network-bridge script
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# because it uses it to create the traditional bridges. It passes the
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# (start|stop|status) parameters into the network-bridge script allowing
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# the user to disassemble the traditional bridges containg physical network
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# devices so that they may change the network configuration of the Physical
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# network interfaces.
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#
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# Host bridges do not need to be disassembled to change the IP address
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# of the virtual interfaces because they do not contain interfaces that
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# have been renamed like the traditional briges (created by the
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# network-bridge script) do. The stop parameter does however cause them
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# to be disassembled and removed. If these bridges are NATed or Routed
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# networks the default gateway of the VMs connected to them will also need
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# to be changed for them to continue accessing the "outside world".
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#
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# The Empty bridges do not contain interfaces from Dom0 so are not
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# affected by IP address changes. The stop parameter does cause them
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# to be removed as well.
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#
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# This script will test for the presence of the physical interfaces
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# configured to be connected to traditional bridges and only attempt to
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# create bridges on the ones that are present and up. It will also test
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# for the presence of virtual interfaces configured to be connected to
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# host bridges and only create bridges for the ones that exist and
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# are not already connected to an existing bridge.
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#
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# Edit the NETDEV_LIST variable to define which physical interfaces
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# you wish to create traditional bridges on. The default is to create a
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# traditional bridge on only the first interface (eth0).
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#
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# Edit the HOST_BRIDGE_LIST variable to define which virtual interfaces
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# you wish to create host bridges on. The default is the 3rd and 4th
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# virtual interfaces (veth2, veth3). The first host bridge (on veth2) is
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# configured as a NAT network and the second host bridge (on veth3) is
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# configured as a hostonly network.
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#
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# Edit the EMPTY_BRIDGE_LIST variable to define which empty bridges to
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# create. This list should contain the numbers of the bridges to
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# create (4 5 6 7)
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#
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# To enable this script edit the network-script field in the
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# /etc/xen/xen-config.sxp file.
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#
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# Example: (network-script network-multi)
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#
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# Depends on: /etc/xen/scripts/xen-network-common.sh
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# /etc/xen/scripts/network-bridge
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#
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# Can use: /etc/sysconfig/dom0config
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#
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# Usage: network-multi (start|stop|status)
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#
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# Vars:
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#
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# SCRIPT_PATH -Path to the directory conaining the xen network-bridge
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# script (typically /etc/xen/scripts)
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#
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# NETDEV_LIST -Space delimited list of physical network devices to
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# create traditional bridges on
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#
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# HOST_BRIDGE_LIST -Space delimited list of virtual network devices to
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# create host bridges on using the following format:
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#
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# <virtual network device>,<mac address>,<IP address/CIDR NetMask>,<nat|hostonly|routed>
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#
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# Example with 2 virtual devices:
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#
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# "veth2,00:16:3E:01:00:02,172.22.0.1/16,nat veth3,00:16:3E:01:00:03,172.23.0.1/16,hostonly"
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#
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# EMPTY_BRIDGE_LIST -Space delimited list of bridge numbers to create as
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# empty bridges.
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#
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# BRIDGE_NAME -Name of bridge to create (example: xenbr)
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#
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# NAT_EXTIF -Network interface to use as the external interface for
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# NATed and Routed networks
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#
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#============================================================================
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#### Read config files and set variables ##################################
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. /etc/xen/scripts/xen-network-common.sh
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# If you do not source the /etc/sysconfig/xend file, uncomment the variables
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# below.
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. /etc/sysconfig/xend
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#NETDEV_LIST="eth0 eth1 eth2"
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#HOST_BRIDGE_LIST="veth2,00:16:3E:01:00:02,172.22.0.1/16,nat veth3,00:16:3E:01:00:03,172.23.0.1/16,hostonly"
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#EMPTY_BRIDGE_LIST="4 5 6 7"
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#BRIDGE_NAME="xenbr"
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#SCRIPT_PATH="/etc/xen/scripts"
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#NAT_EXTIF="eth0"
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#### Script Functions #####################################################
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help() {
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echo "Usage: $0 {start|stop|status}"
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exit 1
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}
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get_option() {
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# Determine which option was passed from the command line.
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case "$1" in
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start|stop|status)
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CMD_OPT="$1"
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;;
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*)
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help
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;;
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esac
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}
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setup_host_interface() {
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# Configure the MAC and IP address of a virtual device.
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#
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# This function is called by other fuctions.
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#
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# usage: setup_host_interface <virtual net device> <MAC Addr> <IP Addr>
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local DEV="$1"
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local MAC="$2"
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local IPADDR="$3"
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case $CMD_OPT in
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start)
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# take the interface down
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ip link set $DEV down
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# ... and configure it
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ip link set $DEV addr $MAC
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ip addr flush $DEV
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ip addr add $IPADDR brd + dev $DEV
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# bring it back up
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ip link set $DEV up
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;;
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stop)
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# take the interface down
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ip link set $DEV down
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# unconfigure it
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ip link set $DEV addr fe:ff:ff:ff:ff:ff
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ip addr flush $DEV
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;;
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status)
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ip addr show $DEV
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;;
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esac
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}
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create_bridges() {
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# Uses the network-bridge script to create bridges on physical devices in Dom0.
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#
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# This fuction passes the start,stop,status parameters on to the network-bridge
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# script.
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for NETDEVICE in $NETDEV_LIST
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do
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local BRIDGE_NUM=${NETDEVICE##${NETDEVICE%%[0-9]*}}
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if /sbin/ip link show $NETDEVICE | grep -qw UP
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then
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echo ""
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echo "============================================================"
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echo "Configuring Virtual Bridge: $BRIDGE_NAME$BRIDGE_NUM"
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echo "using- Physical Interface: $NETDEVICE"
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echo " Virtual Interface: vif$BRIDGE_NUM"
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echo "============================================================"
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echo ""
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$SCRIPT_PATH/network-bridge $CMD_OPT netdev=$NETDEVICE bridge=$BRIDGE_NAME$BRIDGE_NUM vifnum=$BRIDGE_NUM
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echo ""
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echo "------------------------------------------------------------"
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else
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echo " Physical Interface $NETDEVICE is not up. Skipping $BRIDGE_NAME$BRIDGE_NUM"
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echo "------------------------------------------------------------"
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fi
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done
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}
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create_host_bridges() {
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# Creates bridges attached to virtual devices in Dom0 and enables nat or routing
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# on the bridges if specified.
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#
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# This fuction reads the start,stop,status parameter from the $CMD_OPT variable
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# and responds respectively.
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for IFACE in $HOST_BRIDGE_LIST
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do
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local DEV=`echo $IFACE|cut -d "," -f 1`
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local MAC=`echo $IFACE|cut -d "," -f 2`
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local IPADDR=`echo $IFACE|cut -d "," -f 3`
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local BRIDGE_TYPE=`echo $IFACE|cut -d "," -f 4`
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local NAT_GW_IP=`echo $IFACE|cut -d "," -f 3|cut -d "/" -f 1`
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#local NAT_EXTIF=`echo $NETDEV_LIST|cut -d " " -f 1`
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local NAT_INTIF=`echo $IFACE|cut -d "," -f 1`
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local BRIDGE_NUM=${NAT_INTIF##${NAT_INTIF%%[0-9]*}}
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local BR_NAME=$BRIDGE_NAME$BRIDGE_NUM
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local VIF=vif0.$BRIDGE_NUM
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# Determine the initial state of the ip_forward parameter
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#####################################################################
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# FIX ME: We need to make this persistant.
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# Should we write it out to a file?
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#####################################################################
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if [ `cat /proc/sys/net/ipv4/ip_forward` -eq "0" ]
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then
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local INIT_IP_FWD="off"
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else
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local INIT_IP_FWD="on"
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fi
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# Determine if we need to enable ip_forward
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if echo $HOST_BRIDGE_LIST | grep -qE "(nat|NAT|route|ROUTE)"
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then
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local IP_FWD="on"
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else
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local IP_FWD="off"
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fi
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case $CMD_OPT in
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start)
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if ! brctl show | grep -qw $DEV && /sbin/ip address show $DEV
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then
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#------------------------------------------------------------------
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# Create the bridge
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#------------------------------------------------------------------
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echo ""
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echo "============================================================"
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echo "Configuring Virtual Host Bridge: $BR_NAME"
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echo " As a network of type: $BRIDGE_TYPE"
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echo ""
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echo " using- Virtual Interface: $VIF"
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echo " Virtual Device: $DEV"
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create_bridge $BR_NAME
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setup_bridge_port $VIF
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add_to_bridge $BR_NAME $VIF
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setup_host_interface $DEV $MAC $IPADDR
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#------------------------------------------------------------------
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# Set up the bridge as a hostonly / NAT / Routed network
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#------------------------------------------------------------------
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case $BRIDGE_TYPE in
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NAT|nat) # Set up the bridge as NATed network
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echo " Gateway: $NAT_GW_IP"
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echo " External Interface: $NAT_EXTIF"
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if ! [ "$NAT_DONE" = "yes" ]
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then
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if [ "$IP_FWD" = "on" ]
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then
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echo 1 > /proc/sys/net/ipv4/ip_forward
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IP_FWD="done"
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fi
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iptables -t nat -A POSTROUTING -o $NAT_EXTIF -j MASQUERADE
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sysctl -q -w net.bridge.bridge-nf-call-iptables="0"
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NAT_DONE="yes"
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fi
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;;
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ROUTE|route) # Set up the bridge as Routed network
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echo " Gateway: $NAT_GW_IP"
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echo " External Interface: $NAT_EXTIF"
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if [ "$IP_FWD" = "off" ]
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then
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echo 1 > /proc/sys/net/ipv4/ip_forward
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IP_FWD="on"
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fi
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;;
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HOSTONLY|hostonly) # Set up the bridge as hostonly network
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if [ "$IP_FWD" = "on" ]
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then
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iptables -t nat -A PREROUTING -i $NAT_INTIF -j DROP
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fi
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;;
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esac
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echo "============================================================"
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echo "------------------------------------------------------------"
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else
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#------------------------------------------------------------------
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# Skip this bridge
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#------------------------------------------------------------------
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echo " Virtual Interface $DEV is already attached to a bridge or it does not exist."
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echo " Skipping $BR_NAME"
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echo "------------------------------------------------------------"
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fi
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;;
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stop)
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#------------------------------------------------------------------
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# Remove the bridge
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#------------------------------------------------------------------
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echo ""
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echo "============================================================"
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echo "Removing Virtual Host Bridge: $BR_NAME"
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echo " As a network of type: $BRIDGE_TYPE"
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echo ""
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echo " using- Virtual Interface: $VIF"
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echo " Virtual Device: $DEV"
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#------------------------------------------------------------------
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# First remove the hostonly / NAT / Routed configuration
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#------------------------------------------------------------------
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case $BRIDGE_TYPE in
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NAT|nat)
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#####################################################################
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# FIX ME: We need to set the ip_forward value back to the state it
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# was in before the Network script ran.
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# How do we determine that state?
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#####################################################################
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# We could use this if we set the INIT_IP_FWD value from some
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# persistant source.
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#----------------------------------------------------------------------
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#if [ "$INIT_IP_FWD" = "off" ]
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#then
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# echo 0 > /proc/sys/net/ipv4/ip_forward
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#fi
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# This would wack all nat rules. What if they were set before we
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# configured Xen networking?
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#----------------------------------------------------------------------
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#if ! [ "$NAT_REMOVED" = "yes" ]
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#then
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# # Remove all nat iptables rules (host bridge nat PREROUTING DROP, etc.)
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# iptables -F -t nat
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# NAT_REMOVED="yes"
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#fi
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# Turn off routing and clean out the bridge specific nat iptables rule
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echo 0 > /proc/sys/net/ipv4/ip_forward
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iptables -t nat -D POSTROUTING -o $NAT_EXTIF -j MASQUERADE
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sysctl -q -w net.bridge.bridge-nf-call-iptables="1"
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;;
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HOSTONLY|hostonly)
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# Clean out the bridge specific nat iptables rule
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iptables -t nat -D PREROUTING -i $NAT_INTIF -j DROP
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;;
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ROUTE|route)
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#####################################################################
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# FIX ME: We need to set the ip_forward value back to the state it
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# was in before the Network script ran.
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# How do we determine that state?
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#####################################################################
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# Turn off routing
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echo 0 > /proc/sys/net/ipv4/ip_forward
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;;
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esac
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echo "============================================================"
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#------------------------------------------------------------------
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# Then unconfigure the veth
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#------------------------------------------------------------------
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setup_host_interface $DEV $MAC $IPADDR
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#------------------------------------------------------------------
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# remove vif from the bridge
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#------------------------------------------------------------------
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brctl delif $BR_NAME $VIF
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#------------------------------------------------------------------
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# unconfigure the vif
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#------------------------------------------------------------------
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ip link set $VIF down
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ip link set $VIF addr fe:ff:ff:ff:ff:ff
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ip link set $VIF multicast on
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ip link set $VIF arp on
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ip addr flush $VIF
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#------------------------------------------------------------------
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# and finaly unconfigure the bridge
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#------------------------------------------------------------------
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ip link set $BR_NAME down
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brctl delbr $BR_NAME
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echo "------------------------------------------------------------"
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;;
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status)
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#------------------------------------------------------------------
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# Show the status of the bridge
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#------------------------------------------------------------------
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echo ""
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echo "============================================================"
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echo "Status of Virtual Host Bridge: $BR_NAME"
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echo " using- Virtual Interface: $VIF"
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echo " Virtual Device: $DEV"
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echo "------------------------------------------------------------"
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echo "This Network is: $BRIDGE_TYPE"
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echo "============================================================"
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brctl show | grep -w "^$BR_NAME"
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echo ""
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ip addr show $DEV
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#echo ""
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#echo "ip_forward is set to: `cat /proc/sys/net/ipv4/ip_forward`"
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echo "============================================================"
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;;
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esac
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done
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}
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|
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create_empty_bridges() {
|
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# Creates bridges attached to no devices in Dom0.
|
||||
#
|
||||
# This function reads the start,stop,status parameter from the $CMD_OPT
|
||||
# variable and responds respectively.
|
||||
|
||||
echo ""
|
||||
echo "============================================================"
|
||||
for BRIDGE in $EMPTY_BRIDGE_LIST
|
||||
do
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||||
|
||||
local BRIDGE_NUM=$BRIDGE
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||||
local BR_NAME=$BRIDGE_NAME$BRIDGE_NUM
|
||||
|
||||
case $CMD_OPT in
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||||
start)
|
||||
if ! brctl show | grep -qw "^$BR_NAME"
|
||||
then
|
||||
echo "Configuring Virtual Empty Bridge: $BR_NAME"
|
||||
create_bridge $BR_NAME
|
||||
fi
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||||
;;
|
||||
stop)
|
||||
if brctl show | grep -qw "^$BR_NAME"
|
||||
then
|
||||
echo "Unconfiguring Virtual Empty Bridge: $BR_NAME"
|
||||
ip link set $BR_NAME down
|
||||
brctl delbr $BR_NAME
|
||||
fi
|
||||
;;
|
||||
status)
|
||||
brctl show $BR_NAME | grep -w "^$BR_NAME"
|
||||
;;
|
||||
esac
|
||||
done
|
||||
echo "============================================================"
|
||||
}
|
||||
|
||||
#### Call Functions #######################################################
|
||||
|
||||
get_option "$1"
|
||||
create_bridges
|
||||
create_host_bridges
|
||||
create_empty_bridges
|
||||
|
||||
exit 0
|
||||
Reference in New Issue
Block a user