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