+ 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
+ :param path: custom path between the two VNFs (list of switches)
+ :return: output log string
+ """
+ cmd = kwargs.get('cmd')
+ if cmd == 'add-flow':
+ ret = self._chainAddFlow(vnf_src_name, vnf_dst_name, vnf_src_interface, vnf_dst_interface, **kwargs)
+ if kwargs.get('bidirectional'):
+ if kwargs.get('path') is not None:
+ kwargs['path'] = list(reversed(kwargs.get('path')))
+ 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'):
+ if kwargs.get('path') is not None:
+ kwargs['path'] = list(reversed(kwargs.get('path')))
+ ret = ret + '\n' + self._chainAddFlow(vnf_dst_name, vnf_src_name, vnf_dst_interface, vnf_src_interface, **kwargs)
+
+ else:
+ ret = "Command unknown"
+
+ return ret
+
+
+ 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
+ dst_sw_outport_nr = 0
+
+ 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)
+
+ #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']
+ 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']
+ break
+
+ path = kwargs.get('path')
+ if path is None:
+ # 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
+
+ # choose free vlan if path contains more than 1 switch
+ cmd = kwargs.get('cmd')
+ vlan = None
+ if cmd == 'add-flow':
+ if len(path) > 1:
+ vlan = self.vlans.pop()