network/openvswitch: Added (multilayer virtual switch)

Signed-off-by: Niels Horn <niels.horn@slackbuilds.org>

3 files changed, 249 insertions, 0 deletions

diff --git a/network/openvswitch/xen/README b/network/openvswitch/xen/README
new file mode 100644
index 0000000000..93889615e7
--- /dev/null
+++ b/network/openvswitch/xen/README
@@ -0,0 +1,39 @@
+Here are some scripts that I've written for use with Xen at my site.
+In order to use these scripts with your Xen installation you'll need to copy
+both the network-openvswitch and vif-openvswitch files to your
+/etc/xen/scripts directory.  You can instruct Xen to use these scripts by
+editing your /etc/xen/xend-config.sxp file and specifying these scripts as
+the default network-script and vif-script.
+
+For example, here are the entries in my xend-config.sxp file:
+
+  (network-script 'network-openvswitch netdev=eth2 bridge=ovs0')
+
+  (vif-script 'vif-openvswitch bridge=ovs0')
+
+If your network interface card and attached network switch support VLAN
+tagged traffic, you can place virtual machines within a seperate VLAN by
+appending a '.' and the VLAN tag number you wish the domain to use.  For
+example, to have all domains default to VLAN 2 you can do the following:
+
+  (vif-script 'vif-openvswitch bridge=ovs0.2')
+
+You can also specify tagged traffic in the domain configuration file.
+
+If you are hosting a hardware virtualized domain understand that the
+/etc/xen/scripts/qemu-ifup script is run instead of the vif-script specified
+in the xend-config.sxp file.  You'll need to edit this file to add the port
+to the vswitch instead of using the brctl (unless of course you are using
+the appropriate kernel module to control the vswitch using brctl.)  Here is
+a snippet from my qemu-ifup to handle hardware virtualized ports:
+
+  if lsmod | grep -c openvswitch_mod 1> /dev/null && ! lsmod | grep -c brcompat_mod 1> /dev/null
+  then
+      ovs-vsctl -- --may-exist add-port $bridge $1
+  else
+      brctl addif $bridge $1 || true
+  fi
+
+This doesn't handle tagged traffic.  I'll leave that as an exercise for you.
+
+Enjoy.
diff --git a/network/openvswitch/xen/network-openvswitch b/network/openvswitch/xen/network-openvswitch
new file mode 100644
index 0000000000..45cda0b195
--- /dev/null
+++ b/network/openvswitch/xen/network-openvswitch
@@ -0,0 +1,124 @@
+#!/bin/bash
+#============================================================================
+# Default Xen network start/stop script.
+# Xend calls a network script when it starts.
+# The script name to use is defined in ${XEN_CONFIG_DIR}/xend-config.sxp
+# in the network-script field.
+#
+# This script creates a virtual switch (default ${netdev}) and adds a
+# device (defaults to eth0) to it.  The interface that this Open vSwitch
+# is created on should not have a working IP address and will be used as
+# a switch for Xen domU's.
+#
+# Usage:
+# network-openvswitch (start|stop|status) {VAR=VAL}*
+#
+# Vars:
+# bridge     The bridge to use (default xenvs0).
+# netdev     The interface to add to the bridge (default eth0).  This
+#            device should not be configured with an IP address.  If so
+#            this script will tear down the interface and bring it back up
+#            without an IP address.
+#
+# start:
+# Creates the bridge as bridge
+# Enslaves netdev to bridge
+#
+# stop:
+# Removes netdev from the bridge
+# Deletes bridge
+#
+# status:
+# Print addresses, interfaces
+#
+#============================================================================
+
+dir=$(dirname "$0")
+. "$dir/logging.sh"
+. "$dir/xen-script-common.sh"
+. "$dir/xen-network-common.sh"
+. "$dir/locking.sh"
+
+findCommand "$@"
+evalVariables "$@"
+
+netdev=${netdev:-eth0}
+bridge=${bridge:-ovs0}
+
+addr=`ip addr show dev ${netdev} | egrep '^ *inet' | sed -e 's/ *inet //' -e 's/ .*//'`
+if [ -n "$addr" ]; then
+    echo "Invalid device: ${netdev} is up and has a valid IP address!" >&2
+    exit 1
+fi
+
+show_status () {
+    local dev=$1
+    local bridge=$2
+    
+    echo '============================================================'
+    echo 'vSwitch interfaces'
+    ovs-vsctl list-ifaces ${bridge}
+    echo ' '
+    echo 'vSwitch ports'
+    ovs-vsctl list-ports ${bridge}
+    echo '============================================================'
+}
+
+op_start () {
+    if [ "${bridge}" = "null" ] ; then
+	return
+    fi
+
+    ifconfig "${netdev}" down
+    ifconfig "${netdev}" 0.0.0.0 up
+    ovs-vsctl -- --may-exist add-br ${bridge}
+    ifconfig "${bridge}" 0.0.0.0 up
+    ovs-vsctl -- --may-exist add-port ${bridge} ${netdev}
+
+    # Remove any stale ports from last time virtual switch was running.
+    # Open vSwitch has the habit of remembering port settings between
+    # runs.
+    for port in $(ovs-vsctl list-ports ${bridge})
+    do
+	if [ "${port}" != "${netdev}" ]
+	then
+	    ifconfig "${port}" down
+	    ovs-vsctl del-port ${port}
+	fi
+    done
+}
+
+op_stop () {
+    if [ "${bridge}" = "null" ]; then
+	return
+    fi
+
+    # Remove all ports from virtual switch.
+    for port in $(ovs-vsctl list-ports ${bridge})
+    do
+	ifconfig "${port}" down
+	ovs-vsctl del-port ${port}
+    done
+
+    ifconfig "${bridge}" down
+    ovs-vsctl -- --if-exists del-br ${bridge}
+}
+
+case "$command" in
+    start)
+	op_start
+	;;
+    
+    stop)
+	op_stop
+	;;
+
+    status)
+	show_status ${netdev} ${bridge}
+	;;
+
+    *)
+	echo "Unknown command: $command" >&2
+	echo 'Valid commands are: start, stop, status' >&2
+	exit 1
+esac
diff --git a/network/openvswitch/xen/vif-openvswitch b/network/openvswitch/xen/vif-openvswitch
new file mode 100644
index 0000000000..bdcd7c46f7
--- /dev/null
+++ b/network/openvswitch/xen/vif-openvswitch
@@ -0,0 +1,86 @@
+#!/bin/bash
+#============================================================================
+# ${XEN_SCRIPT_DIR}/vif-openvswitch
+#
+# Script for configuring a vif using Open vSwitch.
+#
+# Usage:
+# vif-openvswitch (add|remove|online|offline)
+#
+# Environment vars:
+# vif         vif interface name (required).
+# XENBUS_PATH path to this device's details in the XenStore (required).
+#
+# Read from the store:
+# bridge  bridge to add the vif to (optional).  Defaults to searching for the
+#         bridge itself.
+#
+# up:
+# Enslaves the vif interface to the bridge.
+#
+# down:
+# Removes the vif interface from the bridge.
+#============================================================================
+
+dir=$(dirname "$0")
+. "$dir/vif-common.sh"
+
+bridge=${bridge:-}
+bridge=$(xenstore_read_default "$XENBUS_PATH/bridge" "$bridge")
+
+if [ -z "${bridge}" ]
+then
+    bridge=$(ovs-vsctl listbr | cut -d "
+" -f 1)
+
+    if [ -z "${bridge}" ]
+    then
+	fatal "Could not find bridge and none was specified"
+    fi
+fi
+
+tag=${tag:-}
+
+# Domain on VLAN tagged bridge?
+RET=0
+ovs-vsctl list-br | grep -c ${bridge} 1>/dev/null 2>&1 || RET=1
+if [ $RET -eq 1 ]
+then
+    if [[ $bridge =~ \.[[:digit:]]{1,4}$ ]]
+    then
+	tag=$(echo ${bridge} | cut -d "." -f 2)
+	bridge=$(echo ${bridge} | cut -d "." -f 1)
+    else
+	fatal "Could not find bridge device ${bridge}"
+    fi
+fi
+
+RET=0
+ovs-vsctl list-br | grep -c ${bridge} 1>/dev/null 2>&1 || RET=1
+if [ $RET -eq 1 ]
+then
+    fatal "Could not find bridge device ${bridge}"
+fi
+
+log debug "Successful vif-bridge $command for ${vif}, bridge ${bridge}."
+case "$command" in
+    online)
+	ifconfig "${vif}" 0.0.0.0 up
+	if [ -z $tag ]
+	then
+            ovs-vsctl -- --may-exist add-port ${bridge} ${vif}
+	else
+	    ovs-vsctl -- --may-exist add-port ${bridge} ${vif} tag=${tag}
+	fi
+        ;;
+
+    offline)
+	ovs-vsctl -- --if-exists del-port ${bridge} ${vif}
+	ifconfig "$vif" 0.0.0.0 down
+        ;;
+esac
+
+if [ "$command" == "online" ]
+then
+  success
+fi