main.zeek

OpenFlow

Zeek’s OpenFlow control framework.

This plugin-based framework allows to control OpenFlow capable switches by implementing communication to an OpenFlow controller via plugins. The framework has to be instantiated via the new function in one of the plugins. This framework only offers very low-level functionality; if you want to use OpenFlow capable switches, e.g., for shunting, please look at the NetControl framework, which provides higher level functions and can use the OpenFlow framework as a backend.

Namespace: OpenFlow
Imports: base/frameworks/openflow/consts.zeek, base/frameworks/openflow/types.zeek

Summary

Events

`OpenFlow::controller_activated`: `event`	Event that is raised once a controller finishes initialization and is completely activated.
`OpenFlow::flow_mod_failure`: `event`	Reports an error while installing a flow Rule.
`OpenFlow::flow_mod_success`: `event`	Event confirming successful modification of a flow rule.
`OpenFlow::flow_removed`: `event`	Reports that a flow was removed by the switch because of either the hard or the idle timeout.

Functions

`OpenFlow::controller_init_done`: `function`	Function to signal that a controller finished activation and is ready to use.
`OpenFlow::flow_clear`: `function`	Clear the current flow table of the controller.
`OpenFlow::flow_mod`: `function`	Global flow_mod function.
`OpenFlow::generate_cookie`: `function`	Function to generate a new cookie using our group id.
`OpenFlow::get_cookie_gid`: `function`	Function to get the group id out of a given cookie.
`OpenFlow::get_cookie_uid`: `function`	Function to get the unique id out of a given cookie.
`OpenFlow::lookup_controller`: `function`	Function to lookup a controller instance by name.
`OpenFlow::match_conn`: `function`	Convert a conn_id record into an ofp_match record that can be used to create match objects for OpenFlow.
`OpenFlow::register_controller`: `function`	Function to register a controller instance.
`OpenFlow::unregister_controller`: `function`	Function to unregister a controller instance.

Detailed Interface

Events

OpenFlow::controller_activated 

Type: event (name: string, controller: OpenFlow::Controller)

Event that is raised once a controller finishes initialization and is completely activated.

Parameters

name – Unique name of this controller instance.
controller – The controller that finished activation.

OpenFlow::flow_mod_failure 

Type: event (name: string, match: OpenFlow::ofp_match, flow_mod: OpenFlow::ofp_flow_mod, msg: string &default = "" &optional)

Reports an error while installing a flow Rule.

Parameters

name – The unique name of the OpenFlow controller from which this event originated.
match – The ofp_match record which describes the flow to match.
flow_mod – The openflow flow_mod record which describes the action to take.
msg – Message to describe the event.

OpenFlow::flow_mod_success 

Type: event (name: string, match: OpenFlow::ofp_match, flow_mod: OpenFlow::ofp_flow_mod, msg: string &default = "" &optional)

Event confirming successful modification of a flow rule.

Parameters

name – The unique name of the OpenFlow controller from which this event originated.
match – The ofp_match record which describes the flow to match.
flow_mod – The openflow flow_mod record which describes the action to take.
msg – An optional informational message by the plugin.

OpenFlow::flow_removed 

Type: event (name: string, match: OpenFlow::ofp_match, cookie: count, priority: count, reason: count, duration_sec: count, idle_timeout: count, packet_count: count, byte_count: count)

Reports that a flow was removed by the switch because of either the hard or the idle timeout. This message is only generated by controllers that indicate that they support flow removal in supports_flow_removed.

Parameters

name – The unique name of the OpenFlow controller from which this event originated.
match – The ofp_match record which was used to create the flow.
cookie – The cookie that was specified when creating the flow.
priority – The priority that was specified when creating the flow.
reason – The reason for flow removal (OFPRR_*).
duration_sec – Duration of the flow in seconds.
packet_count – Packet count of the flow.
byte_count – Byte count of the flow.

Functions

OpenFlow::controller_init_done 

Type: function (controller: OpenFlow::Controller) : void

Function to signal that a controller finished activation and is ready to use. Will throw the OpenFlow::controller_activated event.

OpenFlow::flow_clear 

Type: function (controller: OpenFlow::Controller) : bool

Clear the current flow table of the controller.

Parameters: controller – The controller which should execute the flow modification.
Returns: F on error or if the plugin does not support the operation, T when the operation was queued.

OpenFlow::flow_mod 

Type: function (controller: OpenFlow::Controller, match: OpenFlow::ofp_match, flow_mod: OpenFlow::ofp_flow_mod) : bool

Global flow_mod function.

Parameters

controller – The controller which should execute the flow modification.
match – The ofp_match record which describes the flow to match.
flow_mod – The openflow flow_mod record which describes the action to take.

Returns

F on error or if the plugin does not support the operation, T when the operation was queued.

OpenFlow::generate_cookie 

Type: function (cookie: count &default = 0 &optional) : count

Function to generate a new cookie using our group id.

Parameters: cookie – The openflow match cookie.
Returns: The cookie group id.

OpenFlow::get_cookie_gid 

Type: function (cookie: count) : count

Function to get the group id out of a given cookie.

Parameters: cookie – The openflow match cookie.
Returns: The cookie group id.

OpenFlow::get_cookie_uid 

Type: function (cookie: count) : count

Function to get the unique id out of a given cookie.

Parameters: cookie – The openflow match cookie.
Returns: The cookie unique id.

OpenFlow::lookup_controller 

Type: function (name: string) : vector of OpenFlow::Controller

Function to lookup a controller instance by name.

Parameters: name – Unique name of the controller to look up.
Returns: One element vector with controller, if found. Empty vector otherwise.

OpenFlow::match_conn 

Type: function (id: conn_id, reverse: bool &default = F &optional) : OpenFlow::ofp_match

Convert a conn_id record into an ofp_match record that can be used to create match objects for OpenFlow.

Parameters

id – The conn_id record that describes the record.
reverse – Reverse the sources and destinations when creating the match record (default F).

Returns

ofp_match object for the conn_id record.

OpenFlow::register_controller 

Type: function (tpe: OpenFlow::Plugin, name: string, controller: OpenFlow::Controller) : void

Function to register a controller instance. This function is called automatically by the plugin _new functions.

Parameters

tpe – Type of this plugin.
name – Unique name of this controller instance.
controller – The controller to register.

OpenFlow::unregister_controller 

Type: function (controller: OpenFlow::Controller) : void

Function to unregister a controller instance. This function should be called when a specific controller should no longer be used.

Parameters: controller – The controller to unregister.