cloudstack/scripts/vm/hypervisor/xenserver/ovsgre

#!/usr/bin/python
# Version @VERSION@
#
# A plugin for executing script needed by vmops cloud 

import os, sys, time
import XenAPIPlugin
sys.path.append("/opt/xensource/sm/")
import util 
from util import CommandException
import hostvmstats
import socket
import stat
import base64
import tempfile
from os.path import exists as _exists
from time import localtime as _localtime, asctime as _asctime

vSwitchDBPidFile = "/var/run/openvswitch/ovsdb-server.pid"
vSwitchDBDaemonName = "ovsdb-server"
vSwitchPidFile = "/var/run/openvswitch/ovs-vswitchd.pid"
vsctlPath = "/usr/bin/ovs-vsctl"
vSwitchDaemonName = "ovs-vswitchd"

logFile = "/var/log/ovsgre.log"
fLog = None

global result

errors = \
		{"NO_DB_PID_FILE" : "NO_DB_PID_FILE", \
		 "DB_NOT_RUN" : "DB_NOT_RUN", \
		 "NO_SWITCH_PID_FILE" : "NO_SWITCH_PID_FILE", \
		 "SWITCH_NOT_RUN" : "SWITCH_NOT_RUN", \
		 "NO_VSCTL" : "NO_VSCTL", \
		 "COMMAND_FAILED" : "COMMAND_FAILED", \
		 "TUNNEL_EXISTED" : "TUNNEL_EXISTED", \
		 "NO_INPORT" : "NO_INPORT", \
		 "NO_OFPORT" : "NO_OFPORT", \

		 "ERR_ARGS_NUM" : "ERR_ARGS_NUM", \
		 "ERROR_OP" : "ERROR_OP", \
		 "SUCCESS" : "SUCCESS", \
		}

class ovs_log(object):
	def __init__(self, name):
		n = "ovs-%s" % name;
		logfilename = "/var/run/cloud/" + n +".log"

		self.name = logfilename
		self.vmName = name
		self.bridge = ""
		self.domId = ""
		self.seqno = ""
		self.tag = ""
		self.vifs = ""
		self.macs = ""
		self.vlans = ""
		self.ofports = ""

	def write(self):
		log = open(self.name, "w")
		log.write("vmName=%s" % self.vmName)
		log.write("\n")
		log.write("bridge=%s" % self.bridge)
		log.write("\n")
		log.write("domId=%s" % self.domId)
		log.write("\n")
		log.write("seqno=%s" % self.seqno)
		log.write("\n")
		log.write("tag=%s" % self.tag)
		log.write("\n")
		log.write("vifs=%s" % self.vifs)
		log.write("\n")
		log.write("macs=%s" % self.macs)
		log.write("\n")
		log.write("vlans=%s" % self.vlans)
		log.write("\n")
		log.write("ofports=%s" % self.ofports)
		log.close()

	def read(self):
		try:
			lines = [line.rstrip() for line in open(self.name)]
			for i in lines:
				if "=" not in i:
					util.SMlog("invalid line(%s) in %s" % (i, self.name))
					continue

				(key,value) = i.split("=")
				if key == "vmName":
					self.vmName = value
				elif key == "bridge":
					self.bridge = value
				elif key == "domId":
					self.domId = value
				elif key == "seqno":
					self.seqno = value
				elif key == "tag":
					self.tag = value
				elif key == "vifs":
					self.vifs = value
				elif key == "macs":
					self.macs = value
				elif key == "vlans":
					self.vlans = value
				elif key == "ofports":
					self.ofports = value
		except Exception, e:
			util.SMlog(e.__str__())
			util.SMlog("Failed to open ovs log %s" % self.name);

	def get_common_info(self):
		self.read()
		return "%s,%s,%s,%s,%s" % (self.vmName, self.bridge, self.domId,
				self.seqno, self.tag)
	
	def remove(self):
		try:
			os.remove(self.name)
		except:
			util.SMlog("Failed to delete ovs log file " + self.name)

def open_log ():
	global fLog

	try:
		if fLog == None:
			fLog = open (logFile, "a")
	except IOError, e:
		#print e
		pass

def pr (str):
	global fLog

	if fLog != None:
		str = "[%s]:" % _asctime (_localtime()) + str + "\n"
		fLog.write (str)

def close_log ():
	global fLog

	if fLog != None:
		fLog.close ()

def is_process_run (pidFile, name):
	try:
		fpid = open (pidFile, "r")
		pid = fpid.readline ()
		fpid.close ()
	except IOError, e:
		return -1

	pid = pid[:-1]
	ps = os.popen ("ps -ae")
	for l in ps:
		if pid in l and name in l:
			ps.close ()
			return 0

	ps.close ()
	return -2

def is_tool_exist (name):
	if _exists (name):
		return 0
	return -1


def check_switch ():
	global result

	ret = is_process_run (vSwitchDBPidFile, vSwitchDBDaemonName);
	if ret < 0:
		if ret == -1: result = errors["NO_DB_PID_FILE"]
		if ret == -2: result = errors["DB_NOT_RUN"]
		return -1

	ret = is_process_run (vSwitchPidFile, vSwitchDaemonName)
	if ret < 0:
		if ret == -1: result = errors["NO_SWITCH_PID_FILE"]
		if ret == -2: result = errors["SWITCH_NOT_RUN"]
		return -1

	if is_tool_exist (vsctlPath) < 0:
		result = errors["NO_VSCTL"]
		return -1

	return 0

def do_cmd (cmds, lines=False):
	cmd = ""
	for i in cmds:
		cmd += " "
		cmd += i

	pr("do command '%s'" % cmd)
	f = os.popen (cmd)
	if lines == True:
		res = f.readlines ()
	else:
		res = f.readline ()
		res = res[:-1]
	f.close ()

	if lines == False:
		pr("command output '%s'" % res)
	return res

######################## GRE creation utils ##########################
# UUID's format is 8-4-4-4-12
def is_uuid (uuid):
	list = uuid.split ("-")

	if len (list) != 5:
		return -1

	if len (list[0]) != 8 or len (list[1]) != 4 \
	   or len (list[2]) != 4 or len (list[3]) != 4 \
	   or len (list[4]) != 12:
		   return -1

	return 0

def check_gre (bridge, remoteIP, greKey):
	ports = get_ports_on_bridge(bridge)
	if ports == None:
		return "[]"

	for i in ports:
		ifaces = get_interface_on_port(i)
		if ifaces == None:
			continue

		for j in ifaces:
			if j == '[]':
				continue
			options = get_field_of_interface(j, "options")
			if remoteIP in options and greKey in options:
				pr("WARNING: GRE tunnel for remote_ip=%s key=%s already here, \
interface(%s)" % (remoteIP, greKey, j))
				return get_field_of_interface(j, "ofport")

	return "[]"

def ovs_create_gre (session, args):
	global result
	bridge = args.pop("bridge")
	remoteIP = args.pop("remoteIP")
	greKey = args.pop("greKey")
	srcHost = args.pop("from")
	dstHost = args.pop("to")

	name = "%s-%s" % (srcHost, dstHost)
	res = check_gre(bridge, remoteIP, greKey)
	if res != "[]":
		result = "SUCCESS:%s" % res
		return result

	wait = [vsctlPath, "--timeout=30 wait-until bridge %s -- get bridge %s name" % \
			(bridge, bridge)]
	res = do_cmd(wait)
	if bridge not in res:
		pr("WARNIING:Can't find bridge %s for creating tunnel!" % bridge)
		result = "COMMAND_FAILED_NO_BRIDGE"
		return result

	createInterface = [vsctlPath, "create interface", "name=%s" % name, \
			'type=gre options:"remote_ip=%s key=%s"' % (remoteIP, greKey)]
	ifaceUUID = do_cmd (createInterface)
	if is_uuid (ifaceUUID) < 0:
		pr("create interface failed, %s is not UUID" % ifaceUUID)
		result = "COMMAND_FAILED_CREATE_INTERFACE_FAILED"
		return result

	createPort = [vsctlPath, "create port", "name=%s" % name, \
			"interfaces=[%s]" % ifaceUUID]
	portUUID = do_cmd (createPort)
	if is_uuid (portUUID) < 0:
		pr("create port failed, %s is not UUID" % portUUID)
		result = "COMMAND_FAILED_CREATE_PORT_FAILED"
		return result

	addBridge = [vsctlPath, "add bridge %s" % bridge, "ports %s" % portUUID]
	do_cmd (addBridge)

	wait = [vsctlPath, "--timeout=30 wait-until port %s -- get port %s name" % \
			(name, name)]
	res = do_cmd(wait)
	if name in res:
		port = get_field_of_interface(name, "ofport");
		noFlood = [vsctlPath, "ovs-ofctl mod-port %s %s noflood" % (bridge, \
			name)]
		do_cmd(noFlood)
		result = "SUCCESS:%s" % port
	else:
		pr("create gre tunnel failed")
		result = "COMMAND_FAILED_CREATE_TUNNEL_FAILED"
	
	return result
######################## End GRE creation utils ##########################

######################## Flow creation utils ##########################
def get_ports_on_bridge(bridge):
	listBr = [vsctlPath, "list br", bridge]
	res = do_cmd(listBr, True)

	for i in res:
		if "ports" in i:
			(x, str) =  i.split(":")
			str = str.lstrip().rstrip()
			str = str[1:]
			str = str[:-1]
			return str.split(",")
	return None

def get_filed_of_port(nameOruuid, field):
	listport = [vsctlPath, "list port", nameOruuid]
	res = do_cmd(listport, True)

	for i in res:
		if field in i:
			(x, r) = i.split(":")
			return r.lstrip().rstrip()
	return None

def get_field_of_interface(nameOruuid, field):
	listIface = [vsctlPath, "list interface", nameOruuid]
	res = do_cmd(listIface, True)

	for i in res:
		if field in i:
			(x, r) = i.split(":")
			return r.lstrip().rstrip()
	return None

def strip(str, direction="default"):
	str = str.lstrip().rstrip()
	if direction == "left":
		return str[1:]
	if direction == "right":
		return str[:-1]
	if direction == "both":
		str = str[1:]
		str = str[:-1]
		return str
	return str

def get_vif_port(bridge, vifName):
	portUuids = get_ports_on_bridge(bridge)
	if portUuids == None:
		pr("No ports on bridge %s" % bridge)
		return None

	for i in portUuids:
		name = get_filed_of_port(i, "name")
		if name == None:
			pr("WARNING: no name found for %s" % name)
			continue

		name = strip(name, "both")
		if name == vifName:
			return get_field_of_interface(vifName, "ofport")
	return None

def get_interface_on_port(nameOruuid):
	listPort = [vsctlPath, "list port", nameOruuid]
	res = do_cmd(listPort, True)

	for i in res:
		if "interfaces" in i:
			(x, str) = i.split(":")
			str = strip(str, "both")
			return str.split(",")
	return None

def get_gre_ports(bridge):
	portUuids = get_ports_on_bridge(bridge)
	if portUuids == None:
		pr("WARNING:No ports on bridge %s" % bridge)
		return []

	OfPorts = []
	for i in portUuids:
		iface = get_filed_of_port(i, "interfaces")
		iface = strip(iface, "both")
		type = get_field_of_interface(iface, "type")
		if type == 'gre':
			port = get_field_of_interface(iface, "ofport")
			if port != '[]':
				OfPorts.append(port)

	return OfPorts

def get_ofports_by_tag(bridge, tag):
	portUuids = get_ports_on_bridge(bridge)
	if portUuids == None:
		pr("WARNING:No ports on bridge %s" % bridge)
		return []

	OfPorts = []
	for i in portUuids:
		t = get_filed_of_port(i, "tag")
		if t != tag:
			pr("Skip port %s with tag=%s" % (i, t))
			continue

		iface = get_filed_of_port(i, "interfaces")
		iface = strip(iface, "both")
		port = get_field_of_interface(iface, "ofport")
		if port != '[]':
			OfPorts.append(port)

	return OfPorts

def format_flow(inPort, vlan, mac, outPut):
	flow = "in_port=%s dl_vlan=%s dl_dst=%s idle_timeout=0 hard_timeout=0 \
	priority=10000 actions=strip_vlan,output:%s" % (inPort, vlan, mac, outPut)
	return flow

def format_drop_flow(inPort):
	flow = "in_port=%s priority=1000 idle_timeout=0 hard_timeout=0 \
	actions=drop" % inPort
	return flow

def add_drop_flow(bridge, port):
	flow = format_drop_flow(port)
	add_flow(bridge, flow)

def del_flow(bridge, mac):
	param = "dl_dst=%s" % mac
	flow = ["ovs-ofctl del-flows %s" % bridge, '"%s"' % param]
	do_cmd(flow)

def del_arp_and_dhcp_flow(bridge, vlan, inPort):
	param = "dl_type=0x0806 dl_vlan=%s in_port=%s" % (vlan, inPort)
	flow = ["ovs-ofctl del-flows %s" % bridge, '"%s"' % param]
	do_cmd(flow)

	param = "dl_type=0x0800 nw_proto=17 tp_dst=68 dl_vlan=%s, in_port=%s" % (vlan, inPort)
	flow = ["ovs-ofctl del-flows %s" % bridge, '"%s"' % param]
	do_cmd(flow)

	param = "dl_type=0x0800 nw_proto=17 tp_dst=67 dl_vlan=%s, in_port=%s" % (vlan, inPort)
	flow = ["ovs-ofctl del-flows %s" % bridge, '"%s"' % param]
	do_cmd(flow)

def format_normal_flow():
	flow = "priority=0 idle_timeout=0 hard_timeout=0 actions=normal"
	return flow

def format_dhcp_flow(bridge, inPort, vlan, ports):
	outputs = ''
	for i in ports:
		str = "output:%s," % i
		outputs += str
	outputs = outputs[:-1]
	flow = "in_port=%s dl_vlan=%s dl_type=0x0800 nw_proto=17 tp_dst=67 idle_timeout=0 hard_timeout=0 \
	priority=10000 actions=strip_vlan,%s" % (inPort, vlan, outputs)
	return flow

def format_dhcp_client_flow(bridge, inPort, vlan, ports):
	outputs = ''
	for i in ports:
		str = "output:%s," % i
		outputs += str
	outputs = outputs[:-1]
	flow = "in_port=%s dl_vlan=%s dl_type=0x0800 nw_proto=17 tp_dst=68 idle_timeout=0 hard_timeout=0 \
	priority=10000 actions=strip_vlan,%s" % (inPort, vlan, outputs)
	return flow

def format_arp_flow(bridge, inPort, vlan, ports):
	outputs = ''
	for i in ports:
		str = "output:%s," % i
		outputs += str

	outputs = outputs[:-1]
	flow = "in_port=%s dl_vlan=%s dl_type=0x0806 idle_timeout=0 hard_timeout=0 \
	priority=10000 actions=strip_vlan,%s" % (inPort, vlan, outputs)
	return flow

def create_flow (bridge, vifName, mac, vlans):
	global result

	output = get_vif_port(bridge, vifName)
	if output == None:
		pr("WARNING: cannot find ofport for %s" % vifName)
		return errors["NO_OFPORT"]
		return -1
	if output == '[]':
		pr("WARNING: ofport is [] for %s" % vifName)
		return errors["NO_OFPORT"]
		return -1

	#set remap here, remap has format e.g. 1/22/200/13/16
	pr("")
	pr("Create flow for vlans=%s" % vlans)
	for v in vlans.split(","):
		try:
			(vlan, inPort) = v.split(":")
			flow = format_flow(inPort, vlan, mac, output)
			add_flow(bridge, flow)
		except Exception, e:
			pr(e.__str__())
			pr("invalid map")

	# add normal flow make switch work as L2/L3 switch
	flow = format_normal_flow()
	add_flow(bridge, flow)

	inports = get_gre_ports(bridge)
	for i in inports:
		add_drop_flow(bridge, i)

	return errors["SUCCESS"]
######################## End Flow creation utils ##########################

def set_tag(bridge, vifName, vlan):
	# The startVM command is slow, we may wait for a while for it creates vif on
	# open vswitch
	pr("Waiting for %s ..." % vifName)
	waitPortCmd = [vsctlPath, "--timeout=10 wait-until port %s -- get port %s name" % \
			(vifName, vifName)]
	do_cmd (waitPortCmd)
	pr("%s is here" % vifName)

	if get_vif_port(bridge, vifName) == None:
		pr("WARNING: %s is not on bridge %s" % (vifName, bridge))
		return 0

	pr("Set tag")
	set_tagCmd = [vsctlPath, "set port", vifName, "tag=%s"%vlan]
	do_cmd (set_tagCmd)
	return 0

def ask_ports(bridge, vifNames):
	vifs = vifNames.split(",")
	if len(vifs) == 0:
		return ' '

	ofports = []
	for vif in vifs:
		op = get_vif_port(bridge, vif)
		if op == None:
			pr("ask_ports: no port(bridge:%s, vif:%s)" % (bridge, vif))
			continue
		ofports.append(op)

	return ",".join(ofports)

def delete_vm_flows(bridge, vmName, reCreate=True):
	log = ovs_log(vmName)
	log.read()

	macs = log.macs;
	for i in macs.split(","):
		del_flow(bridge, i)
		pr("Delete flows for %s" % i)

	vlans = log.vlans
	for v in vlans.split(","):
		try:
			(vlan, inPort) = v.split(":")
			del_arp_and_dhcp_flow(bridge, vlan, inPort)
		except Exception, e:
			pr(e.__str__())
			pr("invalid map")
	
	if reCreate == False:
		return

	bridge = log.bridge
	tag = log.tag
	noneGreOfPorts = get_ofports_by_tag(bridge, tag)

	try:
		noneGreOfPorts.remove(log.ofports)
	except Exception, e:
		pr(e.__str__())
		pr("ofport %s of %s is not on bridge %s" % (log.ofports, log.vmName,
			bridge))
	
	if len(noneGreOfPorts) != 0:
		set_arp_and_dhcp_flow(bridge, vlans, tag, noneGreOfPorts)
	
	# add normal flow make switch work as L2/L3 switch
	flow = format_normal_flow()
	add_flow(bridge, flow)

	log.remove()

def echo(fn):
	def wrapped(*v, **k):
		name = fn.__name__
		util.SMlog("#### VMOPS enter  %s ####" % name )
		res = fn(*v, **k)
		util.SMlog("#### VMOPS exit  %s ####" % name )
		return res
	return wrapped


def ovs_handle_rebooted_vm(session, vmName):
	curr_domid = '-1'
	log = ovs_log(vmName)
	log.read()
	
	(curr_domid, vifrs, hostuuid) = ovs_get_domid_vifrs_hostuuid(session, vmName)

	old_id = log.domId;
	if curr_domid == old_id:
		util.SMlog("OvsInfo:%s is normal" % vmName)
		return True

	util.SMlog("%s rebooted, reset flow for it" % vmName)
	vlans = log.vlans;
	bridge = log.bridge
	tag = log.tag
	for vifr in vifrs:
		vifName = "vif" + curr_domid + "." + vifr[0]
		set_tag(bridge, vifName, tag)
		create_flow(bridge, vifName, vifr[1], vlans)
	
	log.domId = curr_domid
	log.write()

	return True

@echo
def ovs_get_vm_log(session, args):
	host_uuid = args.pop('host_uuid')
	try:
		thishost = session.xenapi.host.get_by_uuid(host_uuid)
		hostrec = session.xenapi.host.get_record(thishost)
		vms = hostrec.get('resident_VMs')
	except Exception, e:
		util.SMlog("Failed to get host from uuid %s, exception: %s" % (host_uuid, e.__str__()))
		return ' '

	result = []
	try:
		for name in [session.xenapi.VM.get_name_label(x) for x in vms]:
			if 1 not in [ name.startswith(c) for c in ['r-', 'i-'] ]:
				continue
			ovs_handle_rebooted_vm(session, name)
			if name.startswith('i-'):
				log = ovs_log(name)
				info = log.get_common_info()
				result.append(info)
	except Exception, e:
		util.SMlog(e.__str__())
		util.SMlog("OVs failed to get logs, better luck next time!")

	return ";".join(result)

def ovs_write_vm_log(bridge, vmName, vmId, seqno, vifNames, macs, tag, vlans, ofports):
	log = ovs_log(vmName)
	log.read()
	log.bridge = bridge
	log.vmName = vmName
	log.domId = vmId
	log.seqno = seqno
	log.vifs = vifNames
	log.macs = macs
	log.tag = tag
	log.vlans = vlans
	log.ofports = ofports
	log.write()

	util.SMlog("Writing ovs log to " + log.name)

@echo
def ovs_delete_flow(session, args):
	bridge = args.pop('bridge')
	vmName = args.pop('vmName')

	delete_vm_flows(bridge, vmName)
	return 'SUCCESS'

def ovs_get_domid_vifrs_hostuuid(session, vmName):
	def get_vif_field(name, field):
		return session.xenapi.VIF.get_record(name).get(field)

	try:
		vm = session.xenapi.VM.get_by_name_label(vmName)
		if len(vm) != 1:
			return (-1, [], "-1")
		vm_rec = session.xenapi.VM.get_record(vm[0])
		vm_vifs = vm_rec.get('VIFs')
		vifrs = []
		for vif in vm_vifs:
			rec = (get_vif_field(vif, 'device'), get_vif_field(vif, 'MAC'))
			vifrs.append(rec)
		domid = vm_rec.get('domid')
		host = vm_rec.get('resident_on')
		host_rec = session.xenapi.host.get_record(host)
		uuid = host_rec.get('uuid')
		util.SMlog("OVSINFO: (domid:%s, uuid:%s)" % (domid, uuid))
		return (domid, vifrs, uuid)

	except:
		util.SMlog("### Failed to get domid or vif list for vm  ##" + vmName)
		return (-1, [], "-1")

def add_flow(bridge, flow):
	param = bridge + ' "%s"' % flow
	addflow = ["ovs-ofctl add-flow", param]
	do_cmd (addflow)

def set_arp_and_dhcp_flow(bridge, vlans, tag, ofports):
	for v in vlans.split(","):
		try:
			(vlan, inPort) = v.split(":")
			arpFlow = format_arp_flow(bridge, inPort, vlan, ofports)
			add_flow(bridge, arpFlow)

			dhcpFlow = format_dhcp_flow(bridge, inPort, vlan, ofports)
			add_flow(bridge, dhcpFlow)

			dhcpClientFlow = format_dhcp_client_flow(bridge, inPort, vlan, ofports)
			add_flow(bridge, dhcpClientFlow)
		except Exception, e:
			pr(e.__str__())
			pr("invalid map")

@echo
def ovs_set_arp_and_dhcp_flow(session, args):
	vlans = args.pop('vlans')
	bridge = args.pop('bridge')
	tag = args.pop('tag')

	pr("ovs_set_arp_and_dhcp_flow: bridge=%s, vlans=%s, tag=%s" % (bridge,
		vlans, tag))
	if vlans == '[]':
		pr("No need to create arp and dhcp flow")
		return 'SUCCESS'

	ofports = get_ofports_by_tag(bridge, tag)
	if len(ofports) == 0:
		pr("No VMs, skip set arp and dhcp flow for tag=%s" % tag)
		return 'SUCCESS'

	set_arp_and_dhcp_flow(bridge, vlans, tag, ofports)
	return 'SUCCESS'

@echo
def ovs_set_tag_and_flow(session, args):
	bridge = args.pop('bridge')
	vmName = args.pop('vmName')
	vlans = args.pop('vlans')
	tag = args.pop('tag')
	seqno = args.pop('seqno')

	(domid, vifrs, hostuuid) = ovs_get_domid_vifrs_hostuuid(session, vmName)

	if domid == '-1':
		util.SMlog("### Failed to get domid for vm (-1):  " + vmName)
		return 'NO_DOMID'

	if len(vifrs) == 0:
		return 'SUCCESS'

	pr("ovs_set_tag_and_flow: bridge=%s, vmName=%s, vlans=%s, tag=%s, seqno=%s" %
			(bridge, vmName, vlans, tag, seqno))
	#delete old flows first
	delete_vm_flows(bridge, vmName, False)

	vifNames = []
	vlans = strip(vlans, "both")
	macs = []
	for vifr in vifrs:
		vifName = "vif" + domid + "." + vifr[0]
		vifNames.append(vifName)
		mac = vifr[1]
		macs.append(mac)
		set_tag(bridge, vifName, tag)
		create_flow(bridge, vifName, mac, vlans)

	vifs = ",".join(vifNames)
	ofports = ask_ports(bridge, vifs)
	ovs_write_vm_log(bridge, vmName, domid, seqno, vifs, ",".join(macs), tag, vlans, ofports)

	#see if there is rebooted vm to handle
	ovs_get_vm_log(session, {"host_uuid":hostuuid})
	ovs_set_arp_and_dhcp_flow(session, {"bridge":bridge, "tag":tag, "vlans":vlans})
	return 'SUCCESS'

if __name__ == "__main__":
	open_log()
	XenAPIPlugin.dispatch({"ovs_create_gre":ovs_create_gre, "ovs_set_tag_and_flow":ovs_set_tag_and_flow, "ovs_get_vm_log":ovs_get_vm_log,"ovs_delete_flow":ovs_delete_flow})
	close_log()