X-Git-Url: https://osm.etsi.org/gitweb/?a=blobdiff_plain;f=src%2Femuvim%2Fdcemulator%2Fnet.py;h=731331b259cb74d80ecb53bc1f1c9a1927e3f1df;hb=566779d267065c78708112623f9c60afcb01696e;hp=cbe668f1751a80213c7679d69e1e68d81c9ab2b5;hpb=8b04b532bcb52f45ac3465d834142b766d45e771;p=osm%2Fvim-emu.git diff --git a/src/emuvim/dcemulator/net.py b/src/emuvim/dcemulator/net.py index cbe668f..731331b 100755 --- a/src/emuvim/dcemulator/net.py +++ b/src/emuvim/dcemulator/net.py @@ -30,10 +30,9 @@ import logging import site import time from subprocess import Popen -import os import re -import urllib2 -from functools import partial +import requests +import os from mininet.net import Containernet from mininet.node import Controller, DefaultController, OVSSwitch, OVSKernelSwitch, Docker, RemoteController @@ -57,7 +56,7 @@ class DCNetwork(Containernet): """ def __init__(self, controller=RemoteController, monitor=False, - enable_learning = True, # in case of RemoteController (Ryu), learning switch behavior can be turned off/on + enable_learning=False, # learning switch behavior of the default ovs switches icw Ryu controller can be turned off/on, neede for E-LAN functionality dc_emulation_max_cpu=1.0, # fraction of overall CPU time for emulation dc_emulation_max_mem=512, # emulation max mem in MB **kwargs): @@ -70,6 +69,12 @@ class DCNetwork(Containernet): # members self.dcs = {} self.ryu_process = None + #list of deployed nsds.E_Lines and E_LANs (uploaded from the dummy gatekeeper) + self.deployed_nsds = [] + self.deployed_elines = [] + self.deployed_elans = [] + self.installed_chains = [] + # always cleanup environment before we start the emulator self.killRyu() @@ -79,10 +84,18 @@ class DCNetwork(Containernet): Containernet.__init__( self, switch=OVSKernelSwitch, controller=controller, **kwargs) + # default switch configuration + enable_ryu_learning = False + if enable_learning : + self.failMode = 'standalone' + enable_ryu_learning = True + else: + self.failMode = 'secure' + # Ryu management if controller == RemoteController: # start Ryu controller - self.startRyu(learning_switch=enable_learning) + self.startRyu(learning_switch=enable_ryu_learning) # add the specified controller self.addController('c0', controller=controller) @@ -94,9 +107,10 @@ class DCNetwork(Containernet): self.vlans = range(4096)[::-1] # link to Ryu REST_API - ryu_ip = '0.0.0.0' + ryu_ip = 'localhost' ryu_port = '8080' self.ryu_REST_api = 'http://{0}:{1}'.format(ryu_ip, ryu_port) + self.RyuSession = requests.Session() # monitoring agent if monitor: @@ -128,7 +142,7 @@ class DCNetwork(Containernet): """ assert node1 is not None assert node2 is not None - LOG.debug("addLink: n1=%s n2=%s" % (str(node1), str(node2))) + # ensure type of node1 if isinstance( node1, basestring ): if node1 in self.dcs: @@ -206,6 +220,9 @@ class DCNetwork(Containernet): attr_dict2.update(attr_dict) self.DCNetwork_graph.add_edge(node2.name, node1.name, attr_dict=attr_dict2) + LOG.debug("addLink: n1={0} intf1={1} -- n2={2} intf2={3}".format( + str(node1),node1_port_name, str(node2), node2_port_name)) + return link def addDocker( self, label, **params ): @@ -226,9 +243,26 @@ class DCNetwork(Containernet): """ Wrapper for addSwitch method to store switch also in graph. """ + + # add this switch to the global topology overview if add_to_graph: self.DCNetwork_graph.add_node(name) - return Containernet.addSwitch(self, name, protocols='OpenFlow10,OpenFlow12,OpenFlow13', **params) + + # set the learning switch behavior + if 'failMode' in params : + failMode = params['failMode'] + else : + failMode = self.failMode + + s = Containernet.addSwitch(self, name, protocols='OpenFlow10,OpenFlow12,OpenFlow13', failMode=failMode, **params) + + # set flow entry that enables learning switch behavior (needed to enable E-LAN functionality) + #LOG.info('failmode {0}'.format(failMode)) + #if failMode == 'standalone' : + # LOG.info('add NORMAL') + # s.dpctl('add-flow', 'actions=NORMAL') + + return s def getAllContainers(self): """ @@ -261,19 +295,229 @@ class DCNetwork(Containernet): def CLI(self): CLI(self) - # to remove chain do setChain( src, dst, cmd='del-flows') + def setLAN(self, vnf_list): + """ + setup an E-LAN network by assigning the same VLAN tag to each DC interface of the VNFs in the E-LAN + + :param vnf_list: names of the VNFs in this E-LAN [{name:,interface:},...] + :return: + """ + src_sw = None + src_sw_inport_nr = 0 + src_sw_inport_name = None + + # get a vlan tag for this E-LAN + vlan = self.vlans.pop() + + for vnf in vnf_list: + vnf_src_name = vnf['name'] + vnf_src_interface = vnf['interface'] + + # check if port is specified (vnf:port) + if vnf_src_interface is None: + # take first interface by default + connected_sw = self.DCNetwork_graph.neighbors(vnf_src_name)[0] + link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw] + vnf_src_interface = link_dict[0]['src_port_id'] + + for connected_sw in self.DCNetwork_graph.neighbors(vnf_src_name): + link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw] + for link in link_dict: + if (link_dict[link]['src_port_id'] == vnf_src_interface or + link_dict[link]['src_port_name'] == vnf_src_interface): # Fix: we might also get interface names, e.g, from a son-emu-cli call + # found the right link and connected switch + src_sw = connected_sw + src_sw_inport_nr = link_dict[link]['dst_port_nr'] + src_sw_inport_name = link_dict[link]['dst_port_name'] + break + + # set the tag on the dc switch interface + LOG.debug('set E-LAN: vnf name: {0} interface: {1} tag: {2}'.format(vnf_src_name, vnf_src_interface,vlan)) + switch_node = self.getNodeByName(src_sw) + self._set_vlan_tag(switch_node, src_sw_inport_name, vlan) + + def _addMonitorFlow(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, + tag=None, **kwargs): + + src_sw = None + src_sw_inport_nr = 0 + src_sw_inport_name = None + dst_sw = None + dst_sw_outport_nr = 0 + dst_sw_outport_name = None + + LOG.debug("call AddMonitorFlow vnf_src_name=%r, vnf_src_interface=%r, vnf_dst_name=%r, vnf_dst_interface=%r", + vnf_src_name, vnf_src_interface, vnf_dst_name, vnf_dst_interface) + + #check if port is specified (vnf:port) + if vnf_src_interface is None: + # take first interface by default + connected_sw = self.DCNetwork_graph.neighbors(vnf_src_name)[0] + link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw] + vnf_src_interface = link_dict[0]['src_port_id'] + + for connected_sw in self.DCNetwork_graph.neighbors(vnf_src_name): + link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw] + for link in link_dict: + if (link_dict[link]['src_port_id'] == vnf_src_interface or + link_dict[link]['src_port_name'] == vnf_src_interface): # Fix: we might also get interface names, e.g, from a son-emu-cli call + # found the right link and connected switch + src_sw = connected_sw + src_sw_inport_nr = link_dict[link]['dst_port_nr'] + src_sw_inport_name = link_dict[link]['dst_port_name'] + break + + if vnf_dst_interface is None: + # take first interface by default + connected_sw = self.DCNetwork_graph.neighbors(vnf_dst_name)[0] + link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name] + vnf_dst_interface = link_dict[0]['dst_port_id'] + + vnf_dst_name = vnf_dst_name.split(':')[0] + for connected_sw in self.DCNetwork_graph.neighbors(vnf_dst_name): + link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name] + for link in link_dict: + if link_dict[link]['dst_port_id'] == vnf_dst_interface or \ + link_dict[link]['dst_port_name'] == vnf_dst_interface: # Fix: we might also get interface names, e.g, from a son-emu-cli call + # found the right link and connected switch + dst_sw = connected_sw + dst_sw_outport_nr = link_dict[link]['src_port_nr'] + dst_sw_outport_name = link_dict[link]['src_port_name'] + break + + if not tag >= 0: + LOG.exception('tag not valid: {0}'.format(tag)) + + # get shortest path + try: + # returns the first found shortest path + # if all shortest paths are wanted, use: all_shortest_paths + path = nx.shortest_path(self.DCNetwork_graph, src_sw, dst_sw, weight=kwargs.get('weight')) + except: + LOG.exception("No path could be found between {0} and {1} using src_sw={2} and dst_sw={3}".format( + vnf_src_name, vnf_dst_name, src_sw, dst_sw)) + LOG.debug("Graph nodes: %r" % self.DCNetwork_graph.nodes()) + LOG.debug("Graph edges: %r" % self.DCNetwork_graph.edges()) + for e, v in self.DCNetwork_graph.edges(): + LOG.debug("%r" % self.DCNetwork_graph[e][v]) + return "No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name) + + LOG.info("Path between {0} and {1}: {2}".format(vnf_src_name, vnf_dst_name, path)) + + current_hop = src_sw + switch_inport_nr = src_sw_inport_nr + + cmd = kwargs.get('cmd') + + #iterate through the path to install the flow-entries + for i in range(0,len(path)): + current_node = self.getNodeByName(current_hop) + + if path.index(current_hop) < len(path)-1: + next_hop = path[path.index(current_hop)+1] + else: + #last switch reached + next_hop = vnf_dst_name + + next_node = self.getNodeByName(next_hop) + + if next_hop == vnf_dst_name: + switch_outport_nr = dst_sw_outport_nr + LOG.info("end node reached: {0}".format(vnf_dst_name)) + elif not isinstance( next_node, OVSSwitch ): + LOG.info("Next node: {0} is not a switch".format(next_hop)) + return "Next node: {0} is not a switch".format(next_hop) + else: + # take first link between switches by default + index_edge_out = 0 + switch_outport_nr = self.DCNetwork_graph[current_hop][next_hop][index_edge_out]['src_port_nr'] + + + # set of entry via ovs-ofctl + if isinstance( current_node, OVSSwitch ): + kwargs['vlan'] = tag + kwargs['path'] = path + kwargs['current_hop'] = current_hop + kwargs['switch_inport_name'] = src_sw_inport_name + kwargs['switch_outport_name'] = dst_sw_outport_name + kwargs['skip_vlan_tag'] = True + + monitor_placement = kwargs.get('monitor_placement') + # put monitor flow at the dst switch + insert_flow = False + if monitor_placement == 'tx' and path.index(current_hop) == 0: # first node: + insert_flow = True + # put monitoring flow at the src switch + elif monitor_placement == 'rx' and path.index(current_hop) == len(path) - 1: # last node: + insert_flow = True + else: + LOG.exception('invalid monitor command: {0}'.format(monitor_placement)) + + + if self.controller == RemoteController and insert_flow: + ## set flow entry via ryu rest api + self._set_flow_entry_ryu_rest(current_node, switch_inport_nr, switch_outport_nr, **kwargs) + break + elif insert_flow: + ## set flow entry via ovs-ofctl + self._set_flow_entry_dpctl(current_node, switch_inport_nr, switch_outport_nr, **kwargs) + break + + # take first link between switches by default + if isinstance( next_node, OVSSwitch ): + switch_inport_nr = self.DCNetwork_graph[current_hop][next_hop][0]['dst_port_nr'] + current_hop = next_hop + + return "path {2} between {0} and {1}".format(vnf_src_name, vnf_dst_name, cmd) + + def setChain(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, **kwargs): + """ + Chain 2 vnf interfaces together by installing the flowrules in the switches along their path. + Currently the path is found using the default networkx shortest path function. + Each chain gets a unique vlan id , so different chains wil not interfere. + + :param vnf_src_name: vnf name (string) + :param vnf_dst_name: vnf name (string) + :param vnf_src_interface: source interface name (string) + :param vnf_dst_interface: destination interface name (string) + :param cmd: 'add-flow' (default) to add a chain, 'del-flows' to remove a chain + :param cookie: cookie for the installed flowrules (can be used later as identifier for a set of installed chains) + :param match: custom match entry to be added to the flowrules (default: only in_port and vlan tag) + :param priority: custom flowrule priority + :return: output log string + """ + + # special procedure for monitoring flows + if kwargs.get('monitor'): + + # check if chain already exists + found_chains = [chain_dict for chain_dict in self.installed_chains if + (chain_dict['vnf_src_name'] == vnf_src_name and chain_dict['vnf_src_interface'] == vnf_src_interface + and chain_dict['vnf_dst_name'] == vnf_dst_name and chain_dict['vnf_dst_interface'] == vnf_dst_interface)] + + if len(found_chains) > 0: + # this chain exists, so need an extra monitoring flow + # assume only 1 chain per vnf/interface pair + LOG.debug('*** installing monitoring chain on top of pre-defined chain from {0}:{1} -> {2}:{3}'. + format(vnf_src_name, vnf_src_interface, vnf_dst_name, vnf_dst_interface)) + tag = found_chains[0]['tag'] + ret = self._addMonitorFlow(vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, + tag=tag, table_id=0, **kwargs) + return ret + else: + # no chain existing (or E-LAN) -> install normal chain + LOG.warning('*** installing monitoring chain without pre-defined chain from {0}:{1} -> {2}:{3}'. + format(vnf_src_name, vnf_src_interface, vnf_dst_name, vnf_dst_interface)) + pass + + cmd = kwargs.get('cmd') - if cmd == 'add-flow': + if cmd == 'add-flow' or cmd == 'del-flows': ret = self._chainAddFlow(vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, **kwargs) if kwargs.get('bidirectional'): ret = ret +'\n' + self._chainAddFlow(vnf_dst_name, vnf_src_name, vnf_dst_interface, vnf_src_interface, **kwargs) - elif cmd == 'del-flows': - ret = self._chainAddFlow(vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, **kwargs) - if kwargs.get('bidirectional'): - ret = ret + '\n' + self._chainAddFlow(vnf_dst_name, vnf_src_name, vnf_dst_interface, vnf_src_interface, **kwargs) - else: ret = "Command unknown" @@ -283,9 +527,11 @@ class DCNetwork(Containernet): def _chainAddFlow(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, **kwargs): src_sw = None - dst_sw = None src_sw_inport_nr = 0 + src_sw_inport_name = None + dst_sw = None dst_sw_outport_nr = 0 + dst_sw_outport_name = None LOG.debug("call chainAddFlow vnf_src_name=%r, vnf_src_interface=%r, vnf_dst_name=%r, vnf_dst_interface=%r", vnf_src_name, vnf_src_interface, vnf_dst_name, vnf_dst_interface) @@ -305,6 +551,7 @@ class DCNetwork(Containernet): # found the right link and connected switch src_sw = connected_sw src_sw_inport_nr = link_dict[link]['dst_port_nr'] + src_sw_inport_name = link_dict[link]['dst_port_name'] break if vnf_dst_interface is None: @@ -322,6 +569,7 @@ class DCNetwork(Containernet): # found the right link and connected switch dst_sw = connected_sw dst_sw_outport_nr = link_dict[link]['src_port_nr'] + dst_sw_outport_name = link_dict[link]['src_port_name'] break @@ -344,13 +592,28 @@ class DCNetwork(Containernet): current_hop = src_sw switch_inport_nr = src_sw_inport_nr - # choose free vlan if path contains more than 1 switch + # choose free vlan + ## if path contains more than 1 switch cmd = kwargs.get('cmd') vlan = None if cmd == 'add-flow': - if len(path) > 1: + if kwargs.get('tag'): + # use pre-defined tag + vlan = kwargs.get('tag') + else: vlan = self.vlans.pop() + # store the used vlan tag to identify this chain + if not kwargs.get('monitor'): + chain_dict = {} + chain_dict['vnf_src_name'] = vnf_src_name + chain_dict['vnf_dst_name'] = vnf_dst_name + chain_dict['vnf_src_interface'] = vnf_src_interface + chain_dict['vnf_dst_interface'] = vnf_dst_interface + chain_dict['tag'] = vlan + self.installed_chains.append(chain_dict) + + #iterate through the path to install the flow-entries for i in range(0,len(path)): current_node = self.getNodeByName(current_hop) @@ -379,6 +642,8 @@ class DCNetwork(Containernet): kwargs['vlan'] = vlan kwargs['path'] = path kwargs['current_hop'] = current_hop + kwargs['switch_inport_name'] = src_sw_inport_name + kwargs['switch_outport_name'] = dst_sw_outport_name if self.controller == RemoteController: ## set flow entry via ryu rest api @@ -387,8 +652,6 @@ class DCNetwork(Containernet): ## set flow entry via ovs-ofctl self._set_flow_entry_dpctl(current_node, switch_inport_nr, switch_outport_nr, **kwargs) - - # take first link between switches by default if isinstance( next_node, OVSSwitch ): switch_inport_nr = self.DCNetwork_graph[current_hop][next_hop][0]['dst_port_nr'] @@ -405,6 +668,13 @@ class DCNetwork(Containernet): path = kwargs.get('path') current_hop = kwargs.get('current_hop') vlan = kwargs.get('vlan') + priority = kwargs.get('priority') + # flag to not set the ovs port vlan tag + skip_vlan_tag = kwargs.get('skip_vlan_tag') + # table id to put this flowentry + table_id = kwargs.get('table_id') + if not table_id: + table_id = 0 s = ',' if match_input: @@ -415,7 +685,10 @@ class DCNetwork(Containernet): if cookie: flow['cookie'] = int(cookie) + if priority: + flow['priority'] = int(priority) + flow['table_id'] = table_id flow['actions'] = [] @@ -425,22 +698,37 @@ class DCNetwork(Containernet): prefix = 'stats/flowentry/add' if vlan != None: if path.index(current_hop) == 0: # first node - action = {} - action['type'] = 'PUSH_VLAN' # Push a new VLAN tag if a input frame is non-VLAN-tagged - action['ethertype'] = 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame - flow['actions'].append(action) - action = {} - action['type'] = 'SET_FIELD' - action['field'] = 'vlan_vid' - action['value'] = vlan - flow['actions'].append(action) - elif path.index(current_hop) == len(path) - 1: # last node - match += ',dl_vlan=%s' % vlan - action = {} - action['type'] = 'POP_VLAN' - flow['actions'].append(action) - else: # middle nodes + # set vlan tag in ovs instance (to isolate E-LANs) + if not skip_vlan_tag: + in_port_name = kwargs.get('switch_inport_name') + self._set_vlan_tag(node, in_port_name, vlan) + # set vlan push action if more than 1 switch in the path + if len(path) > 1: + action = {} + action['type'] = 'PUSH_VLAN' # Push a new VLAN tag if a input frame is non-VLAN-tagged + action['ethertype'] = 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame + flow['actions'].append(action) + action = {} + action['type'] = 'SET_FIELD' + action['field'] = 'vlan_vid' + action['value'] = vlan + flow['actions'].append(action) + + if path.index(current_hop) == len(path) - 1: # last node + # set vlan tag in ovs instance (to isolate E-LANs) + if not skip_vlan_tag: + out_port_name = kwargs.get('switch_outport_name') + self._set_vlan_tag(node, out_port_name, vlan) + # set vlan pop action if more than 1 switch in the path + if len(path) > 1: + match += ',dl_vlan=%s' % vlan + action = {} + action['type'] = 'POP_VLAN' + flow['actions'].append(action) + + if 0 < path.index(current_hop) < (len(path) - 1): # middle nodes match += ',dl_vlan=%s' % vlan + # output action must come last action = {} action['type'] = 'OUTPUT' @@ -462,7 +750,12 @@ class DCNetwork(Containernet): flow['match'] = self._parse_match(match) self.ryu_REST(prefix, data=flow) + def _set_vlan_tag(self, node, switch_port, tag): + node.vsctl('set', 'port {0} tag={1}'.format(switch_port,tag)) + LOG.debug("set vlan in switch: {0} in_port: {1} vlan tag: {2}".format(node.name, switch_port, tag)) + def _set_flow_entry_dpctl(self, node, switch_inport_nr, switch_outport_nr, **kwargs): + match = 'in_port=%s' % switch_inport_nr cookie = kwargs.get('cookie') @@ -503,7 +796,11 @@ class DCNetwork(Containernet): def startRyu(self, learning_switch=True): # start Ryu controller with rest-API python_install_path = site.getsitepackages()[0] - ryu_path = python_install_path + '/ryu/app/simple_switch_13.py' + # ryu default learning switch + #ryu_path = python_install_path + '/ryu/app/simple_switch_13.py' + #custom learning switch that installs a default NORMAL action in the ovs switches + dir_path = os.path.dirname(os.path.realpath(__file__)) + ryu_path = dir_path + '/son_emu_simple_switch_13.py' ryu_path2 = python_install_path + '/ryu/app/ofctl_rest.py' # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet # Ryu still uses 6633 as default @@ -513,9 +810,12 @@ class DCNetwork(Containernet): FNULL = open("/tmp/ryu.log", 'w') if learning_switch: self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL) + LOG.debug('starting ryu-controller with {0}'.format(ryu_path)) + LOG.debug('starting ryu-controller with {0}'.format(ryu_path2)) else: # no learning switch, but with rest api self.ryu_process = Popen([ryu_cmd, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL) + LOG.debug('starting ryu-controller with {0}'.format(ryu_path2)) time.sleep(1) def killRyu(self): @@ -531,22 +831,35 @@ class DCNetwork(Containernet): Popen(['pkill', '-f', 'ryu-manager']) def ryu_REST(self, prefix, dpid=None, data=None): - try: - if dpid: - url = self.ryu_REST_api + '/' + str(prefix) + '/' + str(dpid) - else: - url = self.ryu_REST_api + '/' + str(prefix) - if data: - #LOG.info('POST: {0}'.format(str(data))) - req = urllib2.Request(url, str(data)) - else: - req = urllib2.Request(url) - ret = urllib2.urlopen(req).read() + if dpid: + url = self.ryu_REST_api + '/' + str(prefix) + '/' + str(dpid) + else: + url = self.ryu_REST_api + '/' + str(prefix) + if data: + req = self.RyuSession.post(url, json=data) + else: + req = self.RyuSession.get(url) + + + # do extra logging if status code is not 200 (OK) + if req.status_code is not requests.codes.ok: + logging.info( + 'type {0} encoding: {1} text: {2} headers: {3} history: {4}'.format(req.headers['content-type'], + req.encoding, req.text, + req.headers, req.history)) + LOG.info('url: {0}'.format(str(url))) + if data: LOG.info('POST: {0}'.format(str(data))) + LOG.info('status: {0} reason: {1}'.format(req.status_code, req.reason)) + + + if 'json' in req.headers['content-type']: + ret = req.json() return ret - except: - LOG.info('error url: {0}'.format(str(url))) - if data: LOG.info('error POST: {0}'.format(str(data))) + + ret = req.text.rstrip() + return ret + # need to respect that some match fields must be integers # http://ryu.readthedocs.io/en/latest/app/ofctl_rest.html#description-of-match-and-actions @@ -564,3 +877,14 @@ class DCNetwork(Containernet): dict.update({match[0]:m2}) return dict + def find_connected_dc_interface(self, vnf_src_name, vnf_src_interface): + for connected_sw in self.DCNetwork_graph.neighbors(vnf_src_name): + link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw] + for link in link_dict: + if (link_dict[link]['src_port_id'] == vnf_src_interface or + link_dict[link]['src_port_name'] == vnf_src_interface): # Fix: we might also get interface names, e.g, from a son-emu-cli call + # found the right link and connected switch + src_sw = connected_sw + src_sw_inport_nr = link_dict[link]['dst_port_nr'] + src_sw_inport_name = link_dict[link]['dst_port_name'] + return src_sw_inport_name \ No newline at end of file