Processing packet header with hardware assistance

• US 10,348,631 B2
• Filed: 11/16/2017
• Issued: 07/09/2019
• Est. Priority Date: 05/25/2012
• Status: Active Grant

• Current Assignee: A10 Networks Incorporated
• Original Assignee: A10 Networks Incorporated
• Inventors: Kamat, Gurudeep, Davis, Ian E., Jalan, Rajkumar
• Primary Examiner(s): Harper, Kevin C.
• Assistant Examiner(s): Rose, Derrick V
• Application Number:
  US15/815,380
• Publication Number:
  US 20180091429A1
• Time in Patent Office: 600 Days
• Field of Search: None
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04L 47/31 by tagging of packets, e.g. using discard eligibility [DE] bits
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/1014 based on the content of a request
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities

Abstract

Methods and systems for load balancing are disclosed. An example method for load balancing commences with receiving a data packet from a host device. The method further includes identifying a header field of the data packet. After identifying the header field of the data packet, the method proceeds with matching the data packet to a network service based on the header field. Thereafter, the method generates a header field block for the data packet based on the network service. The method further includes sending the data packet to a processor module. The data packet is processed based on the header field block.

Claims

1. A method comprising:

receiving, by a packet pre-processor, a data packet from a host device;

identifying, by the packet pre-processor, a header field of the data packet and a sub-header field of the data packet;

matching, by the packet pre-processor, the header field of the data packet to a predetermined header field identifier to determine a network service to be provided by one of a plurality of servers, the predetermined header field identifier being stored in the packet pre-processor;

matching, by the packet pre-processor, the sub-header field of the data packet to a predetermined sub-header field identifier to determine a service policy based on which the network service is to be provided, the predetermined sub-header field identifier being stored in the packet pre-processor;

generating, by the packet pre-processor, a header field block for the data packet based on the network service and the service policy; and

sending, by the packet pre-processor, the data packet to a processor module, wherein the data packet is processed based on the header field block.

2. The method of claim 1, wherein the matching the data packet to the network service based on the header field includes comparing a header field identifier of the data packet to a predetermined header field identifier of a data packet previously processed by the packet pre-processor.

3. The method of claim 2, wherein the predetermined header field identifier is associated with the network service.

4. The method of claim 1, wherein the processing of the data packet by the processor module includes identifying a network service for processing the data packet based on the generated header field block.

5. The method of claim 4, wherein the data packet includes a request for the network service.

6. The method of claim 1, wherein the packet pre-processor is part of a service gateway.

7. The method of claim 1, wherein the data packet IS associated with a predetermined protocol.

8. The method of claim 1, wherein the generating, by the packet pre-processor, the header field block for the data packet based on the network service further includes generating a header field location indicating a starting location of the header field corresponding to the header field identifier in the data packet header and a header field size indicating a size or length of a value of the header field corresponding to the header field identifier in the data packet header.

9. The method of claim 1, wherein the header field block includes a Hypertext Transfer Protocol (HTTP) cookie header field.

10. A system comprising:

a packet pre-processor configured to;

receive a data packet from a host device;

identify a header field of the data packet and a sub-header field of the data packet;

match the header field of the data packet to a predetermined header field identifier to determine a network service to be provided by one of a plurality of servers, the predetermined header field identifier being stored in the packet pre-processor;

match the sub-header field of the data packet to a predetermined sub-header field identifier to determine a service policy based on which the network service is to be provided, the predetermined sub-header field identifier being stored in the packet pre-processor;

generate a header field block for the data packet based on the network service and the service policy; and

send the data packet to a processor module; and

the processor module configured to process the data packet based on the header field.

11. The system of claim 10, where the matching the data packet to the network service based on the header field includes comparing a header field identifier of the data packet to a predetermined header field identifier of a data packet previously processed by the packet pre-processor.

12. The system of claim 11, wherein the predetermined header field identifier is associated with the network service.

13. The system of claim 10, wherein the processing of the data packet includes identifying a network service for processing the data packet based on the generated header field block.

14. The system of claim 13, wherein the data packet includes a request for the network service.

15. The system of claim 10, wherein the packet pre-processor is part of a service gateway.

16. The system of claim 10, wherein the data packet IS associated with a predetermined protocol.

17. The system of claim 16, wherein the predetermined protocol includes an Hypertext Transfer Protocol (HTTP).

18. The system of claim 10, wherein the generating the header field block for the data packet based on the network service further includes generating a header field location indicating a starting location of the header field corresponding to the header field identifier in the data packet header, and a header field size indicating a size or length of a value of the header field corresponding to the header field identifier in the data packet header.

19. The system of claim 10, wherein the header field block includes an HTTP cookie header field.

20. A system comprising:

a packet pre-processor configured to;

receive a data packet from a host device;

identify a header field of the data packet and a sub-header field of the data packet;

match the header field of the data packet to a predetermined header field identifier to determine a network service to be provided by one of a plurality of servers, the predetermined header field identifier being stored in the packet pre-processor;

match the sub-header field of the data packet to a predetermined sub-header field identifier to determine a service policy based on which the network service is to be provided, the predetermined sub-header field identifier being stored in the packet pre-processor;

generate a header field block for the data packet based on the network service and the service policy, wherein the generating the header field block for the data packet based on the network service further includes generating a header field location indicating a starting location of the header field corresponding to the header field identifier in the data packet header, and a header field size indicating a size or length of a value of the header field corresponding to the header field identifier in the data packet header; and

send the data packet to a processor module; and

the processor module configured to process the data packet based on the header field block, wherein the processing of the data packet includes identifying a network service for processing the data packet based on the generated header field block.