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OpenFlow Cookbook

Book Image

OpenFlow Cookbook

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OpenFlow Cookbook
Apr, 2015 | 292 pages
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Table of Contents (17 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Sections
Conventions
Reader feedback
Customer support
Free Chapter
1
1. OpenFlow Channel Connection Establishment (Part 1)
1. OpenFlow Channel Connection Establishment (Part 1)
Introduction
Connection setup on TCP and TLS
Connection setup with multiple controllers
Setting the role of the communication channel towards a controller
Establishing an auxiliary connection to the controller
Handling a handshake message from the controller
Handling a switch configuration message from the controller
Connection interruption procedures
2
1. OpenFlow Channel Connection Establishment (Part 2)
1. OpenFlow Channel Connection Establishment (Part 2)
Introduction
Connection setup on TCP and TLS
Multiple controllers managing a switch with different roles
Setting the role of a controller's communication channel
Auxiliary connection establishment
Sending a handshake message to the switch
Sending a switch configuration message to the switch
3
2. Symmetric Messages and Asynchronous Messages (Part 1)
2. Symmetric Messages and Asynchronous Messages (Part 1)
Sending and processing a hello message
Sending and processing an echo request and a reply message
Sending and processing an error message
Sending and processing an experimenter message
Handling a "Set Asynchronous Configuration message"
Handling a "Get Asynchronous Configuration message" from the controller
Sending a packet-in message to the controller
Sending a flow-removed message to the controller
Sending a port-status message to the controller
Sending a controller role-status message to the controller
Sending a table-status message to the controller
Sending a request-forward message to the controller
Handling a packet-out message from the controller
Handling a barrier message from the controller
4
2. Symmetric Messages and Asynchronous Messages (Part 2)
2. Symmetric Messages and Asynchronous Messages (Part 2)
Sending and processing a hello message
Sending and processing an echo request and a reply message
Sending and processing error message
Sending and processing experimenter message
Configuring the switch to send a list of asynchronous events the controller channel is interested in
Fetching the list of possible asynchronous events that can come from the switch to the controller channel
Processing a packet-in asynchronous message from the switch
Processing a flow removed asynchronous message from the switch
Processing a port-status asynchronous message from the switch
Processing the controller role-status message from the switch
Processing a table status asynchronous message from the switch
Processing a request forward message from the switch
Sending a packet-out message to the switch
Sending a barrier message to the switch
5
3. Flow Table and Flow Entry Modification Messages (Part 1)
3. Flow Table and Flow Entry Modification Messages (Part 1)
Introduction
Modifying a flow table with eviction enabled
Modifying a flow table with vacancy enabled
Adding a new flow entry to a flow table
Deleting a flow entry in a flow table
Modifying a flow entry in a flow table
Flow table synchronizations
6
3. Flow Table and Flow Entry Modification Messages (Part 2)
3. Flow Table and Flow Entry Modification Messages (Part 2)
Introduction
Modifying a flow table with eviction enabled
Modifying a flow table with vacancy enabled
Adding a new flow entry to the flow table
Deleting an entry from a flow table
Modifying an entry in the flow table
7
4. Group Table and Meter Table Modification Messages (Part 1)
4. Group Table and Meter Table Modification Messages (Part 1)
Introduction
Adding a new group entry in a group table
Deleting a group entry in a group table
Modifying a group entry in a group table
Adding a new meter in a meter table
Deleting a meter entry
Modifying a meter entry in a meter table
8
4. Group Table and Meter Table Modification Messages (Part 2)
4. Group Table and Meter Table Modification Messages (Part 2)
Introduction
Adding a new group entry in a group table
Deleting a group entry in a group table
Modifying a group entry in a group table
Adding a new meter in a meter table
Deleting a meter entry
Modifying a meter entry in a meter table
9
5. Handling Multipart Statistics Messages (Part 1)
5. Handling Multipart Statistics Messages (Part 1)
Introduction
Handling a multipart request message to get statistics of an individual flow table entry
Handling a multipart request message to get statistics of a group/aggregate of flow table entry
Handling a multipart request message to get statistics of flow table
Handling a multipart request message to get port statistics
Handling a multipart request message to get port queue statistics
Handling a multipart request message to get meter statistics
Handling a multipart request message to get group statistics
10
5. Handling Multipart Statistics Messages (Part 2)
5. Handling Multipart Statistics Messages (Part 2)
Getting statistics of an individual flow table entry using multipart messages
Getting statistics of group/aggregate of flow table entries using multipart messages
Getting statistics of flow table using multipart messages
Getting port statistics using multipart messages
Getting port queue statistics using multipart messages
Getting meter statistics using multipart messages
Getting group statistics using multipart messages
11
6. Handling Multipart State Information Messages (Part 1)
6. Handling Multipart State Information Messages (Part 1)
Introduction
Getting information about the switch using multipart messages
Getting group description using multipart messages
Getting group feature using multipart messages
Getting meter configuration using multipart messages
Getting the meter feature using multipart messages
Getting the table feature using multipart messages
Getting port description using multipart messages
Getting table description using multipart messages
Getting queue description using multipart messages
Configuring Flow monitor using multipart messages
Experimenter multipart messages
12
6. Handling Multipart State Information Messages (Part 2)
6. Handling Multipart State Information Messages (Part 2)
Introduction
Getting information about the switch using multipart messages
Getting the group description using multipart messages
Getting the group feature using multipart messages
Getting the meter configuration using multipart messages
Getting the meter feature using multipart messages
Getting the table feature using multipart messages
Getting the port description using multipart messages
Getting the table description using multipart messages
Getting the queue description using multipart messages
Configuring the flow monitor using multipart messages
Experimenter multipart message
13
7. Handling Bundle Messages (Part 1)
7. Handling Bundle Messages (Part 1)
Introduction
Creation of a bundle
Adding messages to a bundle
Closing a bundle
Committing or executing all the operations inside a bundle
Discarding a bundle
14
7. Handling Bundle Messages (Part 2)
7. Handling Bundle Messages (Part 2)
Introduction
Creation of a bundle
Adding messages to a bundle
Closing a bundle
Committing or executing all the operations inside a bundle
Discarding a bundle
15
A. Common OpenFlow Headers, Structures, and Error Code
A. Common OpenFlow Headers, Structures, and Error Code
Common OpenFlow headers
Common OpenFlow structures
Common OpenFlow error codes
Common OpenFlow multipart message types
16
Index
Index

Sending and processing error message

Error messages are used by both the controller and the switch to notify the problem to other end of the connection. Error messages are typically used by the switch to inform the controller about failure of execution of the request sent from the controller.

How to do it...

Whenever the controller wants to send an error message to the switch, it should create the OFPT_ERROR message, which takes the following message format:

/* OFPT_ERROR: Error message (datapath -> the controller). */
struct ofp_error_msg {
struct ofp_header header;
uint16_t type;
uint16_t code;
uint8_t data[0]; /* Variable-length data. Interpreted based
on the type and code. No padding. */
};
How to do it...

The type indicates the high-level type of the error. The code value is interpreted based on the type. The data value is a piece of variable-length data that is interpreted based on both type and value. The data field should contain an ASCII text string that adds details on why the error occurred....

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