Method and apparatus for radix decision packet processing

• US 5,546,390 A
• Filed: 12/29/1994
• Issued: 08/13/1996
• Est. Priority Date: 12/29/1994
• Status: Expired due to Term

• Current Assignee: Network Systems Corp. (Oracle Corporation)
• Original Assignee: Storage Technology Corp (Oracle Corporation)
• Inventors: Stone, Geoffrey C.
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US08/366,222
• Time in Patent Office: 593 Days
• Field of Search: 370/58.1, 370/58.2, 370/58.3, 370/60, 370/60.1, 370/61, 370/79, 370/82, 370/83, 370/85.13, 370/85.14, 370/94.1, 370/94.2, 370/94.3, 370/99, 395/200, 395/325, 395/375, 395/650, 395/800
• US Class Current: 370/408
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A decision process is optimized through selectively examining only those bits of a protocol data unit received from a communication network which affect the decision process. These decision-significant bits include two non-contiguous bits of the protocol data unit. Subsequently, a portion of the received protocol data unit is compared with a predetermined tuple to validate the decision process. The predetermined tuple includes known values for a specific portion of the protocol data unit having the two non-contiguous decision-significant bits. Associated directives are generated for the protocol data unit based upon the validated decision process. Alternatively, this processing is a radix tree-type decision process in which the decision-significant bits are grouped together into decision groups and decisions are made based on decision groups rather than individual decision-significant bits. In addition, a preprocessing device, a decision processor, and a protocol data unit processing system are provided which perform either decision process.

Claims

1. A method of processing a protocol data unit in a communication network, comprising the device-implemented steps of:

(a) optimizing a decision process by selectively examining only those significant bits of a protocol data unit received from the communication network which affect the decision process, these decision-significant bits comprising at least two non-contiguous bits of the protocol data unit;

(b) validating the decision process by comparing a portion of the received protocol data unit with a predetermined tuple, the predetermined tuple consisting of known values for a specific portion of the protocol data unit including the at least two non-contiguous decision-significant bits; and

(c) generating at least one associated directive for the protocol data unit based upon the validated decision process, the at least one associated directive specifying subsequent processing requirements of the protocol data unit.

2. The method of claim 1 wherein the decision process comprises identifying the protocol data unit.

3. The method of claim 1 wherein the decision-significant bits further comprise at least two contiguous bits of the protocol data unit.

4. The method of claim 1 wherein the step of optimizing comprises selectively examining decision-significant bits of the protocol data unit according to a radix-type decision process.

5. The method of claim 1 wherein the step of optimizing comprises selectively examining several decision-significant bits of the protocol data unit in a single step of the decision process.

6. The method of claim 1 wherein the step of validating comprises splitting the validation into parts by beginning validating after a portion of the decision process is completed and before all of the decision process is completed.

7. A method of radix-type decision processing a protocol data unit in a communication network, comprising the device-implemented steps of:

(a) selectively examining only those significant bits of a protocol data unit received from the communication network which affect a radix tree-type decision process, these decision-significant bits comprising at least two non-contiguous bits of the protocol data unit;

(b) grouping the decision-significant bits together into decision groups; and

(c) making decisions in the decision process based on decision groups rather than individual decision-significant bits.

8. The method of claim 7 wherein the decision process comprises identifying, verifying, and determining subsequent processing needs of the protocol data unit.

9. The method of claim 7 wherein the significant bits further comprise at least two contiguous bits of the protocol data unit.

10. A protocol data unit preprocessing device for use in a communication network to optimize a decision process related to protocol data units within the communication network, the preprocessing device comprising:

(a) filter means for selectively examining only those bits of a protocol data unit received from the communication network which affect the decision process, these decision-significant bits comprising at least two non-contiguous bits of the protocol data unit;

(b) validation means, operatively coupled to the filter means, for validating the decision process by comparing a portion of the protocol data unit with a predetermined tuple, the predetermined tuple consisting of known values for a specific portion of the protocol data unit including the at least two non-contiguous decision-significant bits; and

(c) generation means, operatively coupled to the validation means, for generating at least one associated directive for the protocol data unit based upon the validated decision process, the at least one associated directive specifying subsequent processing requirements of the protocol data unit.

11. The protocol data unit preprocessing device of claim 10 wherein the decision-significant bits further comprise decision-significant contiguous bits of the protocol data unit.

12. The protocol data unit preprocessing device of claim 10 wherein the filter means comprises means for selectively examining decision-significant bits of the protocol data unit according to a radix-type decision process.

13. The protocol data unit preprocessing device of claim 10 wherein the filter means comprises means for selectively examining several decision-significant bits of the protocol data unit in a single step of the decision process.

14. The protocol data unit preprocessing device of claim 10 wherein the validation means comprises means for splitting the validation into parts by beginning validating after a portion of the decision process is completed and before all of the decision process is completed.

15. A protocol data unit processing system for use in the communication network to transfer protocol data units within the communication network having the preprocessing device of claim 10 and further comprising:

synchronizing means, operatively coupled to the preprocessing device and the communication network, for synchronizing the received protocol data unit with the at least one associated directive for the protocol data unit to generate a synchronized protocol data unit; and

restructuring means, operatively coupled to the synchronizing means, for restructuring the synchronized protocol data unit in accordance with the at least one associated directive for the protocol data unit to generate a restructured protocol data unit.

16. The protocol data unit processing system of claim 15 wherein the preprocessing device includes means for operating on a first and a second protocol data units such that the preprocessing device can interleave processing of both the first and the second protocol data units during a single time span, and wherein the synchronizing means comprises means for synchronizing both the first and the second protocol data units with the at least one associated directive for that particular protocol data unit.

17. The protocol data unit processing system of claim 16 wherein the preprocessing device comprises a first and a second preprocessor operatively connected in series such that the first preprocessor begins the processing necessary for implementing the filter means and the second preprocessor completes the processing necessary for implementing the generation means.

18. The protocol data unit processing system of claim 15 wherein the restructuring means includes means for restructuring the synchronized protocol data unit by deleting, inserting, and replacing bits in the synchronized protocol data unit in accordance with the at least one associated directive for the protocol data unit.

19. The protocol data unit processing system of claim 15 wherein the restructuring means includes means for monitoring the synchronized protocol data unit by dropping, sending, sending a copy of, and auditing the contents of the synchronized protocol data unit in accordance with the at least one associated directive for the protocol data unit.

20. The protocol data unit processing system of claim 15 further comprising receiving means, operatively coupled to the preprocessing device, for receiving the protocol data unit from the communication network.

21. The protocol data unit processing system of claim 15 further comprising transmitting means, operatively coupled to the restructuring means, for transmitting the reconstructed protocol data unit over the communication network.

22. A radix-based decision processor for use in a communication network, comprising:

(a) filter means for selectively examining only those significant bits of a protocol data unit received from the communication network which affect a radix-type decision process, these decision-significant bits comprising at least two non-contiguous bits of the protocol data unit;

(b) grouping means, operatively coupled to the filter means, for grouping the decision-significant bits together into decision groups; and

(c) decision means, operatively coupled to the grouping means, for making decisions in the decision process based on decision groups rather than individual decision-significant bits.

23. The decision processor of claim 22 wherein the decision means comprises means for implementing a decision process which includes identifying, verifying, and determining subsequent processing needs of the protocol data unit.

24. The decision processor of claim 22 wherein the decision-significant bits further comprise at least two contiguous bits of the protocol data unit.

25. A protocol data unit processing system for use in the communication network to transfer protocol data units within the communication network having the decision processor of claim 23 which generates at least one associated directive derived from the determined subsequent processing needs of the protocol data unit and further comprising:

synchronizing means, operatively coupled to the decision processor and the communication network, for synchronizing the received protocol data unit with the at least one associated directive for the protocol data unit to generate a synchronized protocol data unit; and

restructuring means, operatively coupled to the synchronizing means, for restructuring the synchronized protocol data unit in accordance with the at least one associated directive for the protocol data unit to generate a restructured protocol data unit.

26. The protocol data unit processing system of claim 25 wherein the decision processor includes means for operating on a first and a second protocol data units such that the decision processor can interleave processing of both the first and the second protocol data units during a single time span, and wherein the synchronizing means comprises means for synchronizing both the first and the second protocol data units with the at least one associated directive for that particular protocol data unit.

27. The protocol data unit processing system of claim 26 wherein the decision processor comprises a first and a second processor operatively connected in series such that the first processor begins the processing necessary for implementing the filter means and the second processor completes the processing necessary for implementing the decision means.

28. The protocol data unit processing system of claim 25 wherein the restructuring means includes means for restructuring the synchronized protocol data unit by deleting, inserting, and replacing bits in the synchronized protocol data unit in accordance with the at least one associated directive for the protocol data unit.

29. The protocol data unit processing system of claim 25 wherein the restructuring means includes means for monitoring the synchronized protocol data unit by dropping, sending, sending a copy of, and auditing the contents of the synchronized protocol data unit in accordance with the at least one associated directive for the protocol data unit.

30. The protocol data unit processing system of claim 25 further comprising receiving means, operatively coupled to the decision processor, for receiving the protocol data unit from the communication network.

31. The protocol data unit processing system of claim 25 further comprising transmitting means, operatively coupled to the restructuring means, for transmitting the reconstructed protocol data unit over the communication network.