CN114885047A - Protocol analysis method, system and readable storage medium for programmable network - Google Patents
Protocol analysis method, system and readable storage medium for programmable network Download PDFInfo
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Abstract
The invention discloses a protocol analysis method, a system and a readable storage medium of a programmable network. The protocol analysis method mainly comprises two parts: the front end side converts a self-defined protocol written by a user based on a P4 language into information in a json format; and the back end side extracts and converts the information required by the UDF _ SAI from the information in the json format and the flow table information configured by the user, operates the ASIC switch through the UDF _ SAI and finally realizes the analysis of the user-defined network protocol on the ASIC switch. The invention can make the traditional ASIC exchanger supporting the UDF _ SAI analyze the custom protocol through the P4 language, thereby saving the development time of the custom protocol and the application range of the traditional ASIC exchanger.
Description
Technical Field
The invention belongs to the technical field of protocol analysis processing, and particularly relates to a protocol analysis method, a protocol analysis system and a readable storage medium of a programmable network.
Background
With the continuous expansion of internet scale, the updating speed of network protocols is increasing, which requires that network devices can adapt to newly added network protocols quickly, and current network devices are generally implemented by using traditional Application Specific Integrated Circuits (ASICs), but ASICs generally only support inherent protocols and cannot support flexible custom resolution network protocols, so when a new protocol is encountered, a chip manufacturer arranges support of a new chip version step by step according to actual conditions after a relevant protocol specification is proposed, but due to the inherent problems of a chip development cycle, development cost and the like, the support of ASICs to the newly added network protocols needs to be performed for about 3 to 5 years, which cannot meet the time requirements of users to the newly added network protocols, and meanwhile, because the traditional network devices generally realize the support to the newly added network protocols by means of a new chip, this requires extremely high equipment investment costs.
Disclosure of Invention
The invention aims to provide a protocol analysis method, a system and a readable storage medium of a programmable network, aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a protocol analysis method of a programmable network comprises the following steps:
(1) the front end side checks the front end format of a custom protocol written by a user based on P4 language; if the P4 protocol code written by the user accords with the constraint of the exchange abstraction interface UDF _ SAI encapsulated by the user-defined domain, the protocol code is converted into information output in a json format, and if the protocol code does not accord with the constraint, error information is reported.
(2) And the back end side extracts and converts the information required by the UDF _ SAI from the information in the json format and the flow table information configured by the user, operates the ASIC through the UDF _ SAI and finally realizes the analysis of the user-defined network protocol on the ASIC.
Further, step (1) comprises the following sub-steps:
(1.1) performing front-end format check on a custom protocol written by a user based on a P4 language, including action check on head header modification, judging whether the modified front-end format is in a range supported by the UDF _ SAI, if the modified front-end format accords with the constraint of the UDF _ SAI, outputting a json of an intermediate representation form of P4 protocol codes, and if the modified front-end format does not accord with the constraint of the UDF _ SAI, reporting error information.
(1.2) json information output from the front end side includes: the user defines the structure of the data packet head of the protocol, the logical relation of the protocol analysis and the modification information of the head field in the protocol.
Further, in the step (1.2), the header structure of the packet of the user-defined protocol includes the name of the header field and the length of the field; the logical relation of the protocol analysis comprises parameters and states required by the head jump of different protocols; the modification information of the header in the protocol comprises the name of the table, the matched key words, the name of the action and the specific action.
Further, the step (2) includes the following sub-steps:
and (2.1) the back end side extracts the information of the data packet header from the information of the json format, and determines the start bit and the offset of the custom protocol analysis data packet according to the structure of the data packet header and the header field needing to be modified.
(2.2) the back end side extracts the matching data and the matching mask from the flow table information configured by the user.
(2.3) the back end side extracts the operation action on the header field from the json format information, and extracts the parameter corresponding to the action from the flow table information configured by the user.
And (2.4) combining the start bit and the offset extracted in the step (2.1), the matching data and the matching mask extracted in the step (2.2) and the operation action and the action parameter of the header field extracted in the step (2.3) to form all the information of the UDF _ SAI required to be extracted by the user.
And (2.5) converting all the information of the UDF _ SAI extracted in the step (2.4) into a UDF _ SAI interface form, and operating the ASIC through the UDF _ SAI to finish the user-defined protocol analysis.
Further, in step (2.2), the flow table information configured by the user includes: the name of the table, the name of the action, the value of the keyword, and the parameter of the action; the matching data is the value of a keyword in the user-configured flow table information.
The types of matches include exact matches and longest prefix matches. If the matching type is the longest prefix matching, the length of the matching keyword mask is increased in the flow table information configured by the user; and determining the matching value of the data packet header field according to the value of the matched key of the data packet, the matching type and the length of the matched key mask. If the matching type is accurate matching, adding a default value of a matching keyword mask in flow table information configured by a user, wherein the length of the default value is the bit width of the keyword; and finally, determining the matching value of the data packet header field according to the value of the matched key word of the data packet, the matching type and the length of the matched key word mask.
A protocol analysis system of a programmable network comprises one or more processors and is used for realizing the protocol analysis method of the programmable network.
A readable storage medium on which a program is stored, the program, when executed by a processor, implementing the protocol parsing method of the programmable network described above.
The invention has the beneficial effects that: the invention uses ASIC hardware equipment with low cost, realizes flexible and self-defined analysis of the network protocol, reduces the cost for replacing the network equipment due to the update of the network protocol, has simple and convenient realization method and flexible means, can fully analyze the network protocol, and is applied to the actual network environment.
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FIG. 1 is a flow chart of a protocol parsing method for a programmable network of the present invention;
fig. 2 is a block diagram of a protocol parsing system of a programmable network according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the protocol parsing method for a programmable network according to the present invention includes a front end side and a back end side according to sub-functional division, and includes the following steps:
step 1: and the front end side performs front end format check on a custom Protocol written by a user based on a P4 (Programming Protocol-independent Packet Processors) language, including action check on modification of a header, and judges whether the front end format check is in a range supported by an exchange abstraction interface (UDF _ SAI) encapsulated in a custom domain. If the P4 protocol code written by the user conforms to the specification of UDF _ SAI, outputting an intermediate representation form json of the P4 protocol code; if the UDF SAI specification is not met, an error message will be reported. The UDF SAI is a Switch Abstraction Interface (SAI) encapsulated by a User Defined Field (UDF).
Step 2: the front end side outputs corresponding json information based on a user-defined protocol, and the json information comprises the following contents: the user defines the structure of the data packet head of the protocol, the logical relation of the protocol analysis and the modification information of the head field in the protocol. The data packet header structure of the user-defined protocol comprises the name of a header field and the length of the field; the logical relation of the protocol analysis comprises parameters and states required by the head jump of different protocols; the modification information of the header in the protocol comprises the name of the table, the matched key words, the name of the action and the specific action.
And step 3: and the back end side extracts the information of the data packet head from the information of the json format, and determines the start bit and the offset of the custom protocol analysis data packet according to the structure of the data packet head and the head field needing to be modified. For example, if the source IP address field of the Internet Protocol version 4 (IPv 4) Protocol is modified to modify the source IP address 10.0.0.1 to 10.0.0.2, the extracted start bit is the second layer header and the offset is 96 bits.
And 4, step 4: the back end side extracts matching data and a matching mask from flow table information configured by a user. The flow table information configured by the user should contain the following: name of table, name of action, value of key, parameter of action. And the matching data is the value of the keyword in the flow table information configured by the user. The matching data extracted at this time is 0x0a000001, and the mask is 0 xfffffff. In addition, the types of matches include exact matches and longest prefix matches.
If the matching type is longest prefix matching, the length of the matching key mask is increased in addition to the above 4 parameters. And determining the matching value of the header field of the data packet according to the value of the matched key of the data packet, the matching type and the length of the matching mask.
If the matching type is accurate matching, adding a default value of a matching keyword mask in flow table information configured by a user, wherein the default value is 1, and the length of 1 is the bit width of the keyword; and finally, determining the matching value of the data packet header field according to the value of the matched key word of the data packet, the matching type and the length of the matched key word mask.
And 5: the back end side extracts an operation action on the header field from the information in the json format, and extracts a parameter corresponding to the action from the flow table information configured by the user. The operation action extracted at this time is source IPv4 address modification, and the parameter of the action is 0x0a 000002.
Step 6: and combining the start bit and the offset extracted in the step 3, the matching data and the matching mask extracted in the step 4 and the operation action and the action parameter of the header field extracted in the step 5 to form all the information of the UDF _ SAI required to be extracted by the user.
And 7: and 4, converting all the information of the UDF _ SAI extracted in the step 6 into a UDF _ SAI interface form, and operating the ASIC through the UDF _ SAI to finish the user-defined protocol analysis.
The protocol analysis method of the programmable network provided by one embodiment of the invention comprises the steps that the front end side converts a self-defined protocol written by a user based on a P4 language into information in a json format; and the back end side extracts and converts the information required by the UDF _ SAI from the information in the json format and the flow table information configured by the user, operates the ASIC switch through the UDF _ SAI and finally realizes the analysis of the user-defined network protocol on the ASIC switch.
The front end side carries out front end check on a user-defined protocol written by a user based on a P4 language, and if a P4 protocol code written by the user conforms to the regulation of UDF _ SAI, json format information is output; if the UDF SAI specification is not met, an error message will be reported.
Specifically, taking the MobilityFirst protocol as an example:
step 1: the action operation of the P4 protocol written by the user is checked, and in the MobilityFirst protocol, data stream matching is performed according to a Globally Unique Identity (GUID) of a Header field in a Header, and the data stream is forwarded to a device of a target GUID. After the front end side is checked, the redirection operation of the data stream is definitely required to be completed, and the support range of the UDF _ SAI is met, and then a custom protocol of the P4 language is converted into an intermediate representation form of a json format; if in the implementation of the P4 code, the front end side checks find that the priority configuration of the data stream needs to be done according to the GUID, but the priority function is not in the UDF SAI support scope, the front end side reports an error message.
Step 2: json information output by the front end side based on the MobilityFirst protocol mainly includes the following contents: the method comprises the steps that a user self-defines the structure of a data packet header of a protocol, namely, fields needing to be analyzed for forwarding a data stream of the MobilityFirst comprise bit <32> type, bit <32> src _ guid and bit <32> dst _ guid; the logical relationship of protocol resolution, namely the jump relationship of the header field, when the ethernet _ type =0x27c0, the MobilityFirst header field is resolved; when ethernet _ type =0x0800, the IP header field is parsed. The modification information of the header field in the protocol, that is, when the hdr.mf.dst _ guid =0x12345678 of the packet, the packet is forwarded, and the name mf _ table of the table of this operation, the matching keyword hdr.mf.dst _ guid, the name mf _ forward of the action, and the specific action redirect need to be stored.
And step 3: and the back end side extracts the information of the data packet head from the information of the json format, and determines the start bit and the offset of the custom protocol analysis data packet according to the structure of the data packet head and the head field needing to be modified. In this embodiment, since the header information of the data packet to be extracted is dst _ guid, the start bit is 64bits, that is, 32bits of type field plus 32bits of src _ guid; the offset is dst _ guid length 32 bits.
And 4, step 4: the back end side extracts matching data and a matching mask from flow table information configured by a user. The flow table information configured by the user should contain the following: the name mf _ table of the table, the name mf _ forward of the action, the value 0x12345678 of the keyword, the parameter redirect of the action, and the match type in this example is exact match, so the extracted match data is 0x12345678, and the match mask is 0 xfffffffffff.
And 5: the back-end side extracts an operation action on the header field, i.e., a redirection operation, from the json format information, and extracts a parameter corresponding to the action, i.e., a forwarded port number port =0x1, from the flow table information configured by the user.
Step 6: and combining the start bit 64bits and the offset 32bits extracted in the step 3, the matching data 0x12345678 and the matching mask 0 xfffffffff extracted in the step 4, and the operation action redirect and the action parameter port =0x1 on the header field extracted in the step 5 to form all the information of the UDF _ SAI required to be extracted by the user.
And 7: and 4, converting all the information of the UDF _ SAI extracted in the step 6 into a UDF _ SAI interface form, and operating the ASIC through the UDF _ SAI to finish the user-defined protocol analysis.
Fig. 2 is a block diagram of a protocol parsing system of a programmable network according to an embodiment of the present invention.
The invention relates to a protocol analysis system of a programmable network, which comprises one or more processors and is used for realizing the protocol analysis method of the programmable network. In some embodiments, a protocol resolution system of a programmable network of the present invention may include a readable storage medium, which may include a non-volatile storage medium.
In some embodiments, a protocol resolution system for a programmable network of the present invention may include a memory and an interface.
In some embodiments, the protocol parsing system of a programmable network of the present invention may also include other hardware depending on the actual application.
The readable storage medium of the embodiment of the present invention stores thereon a program that, when executed by a processor, implements the protocol parsing method of the above-described programmable network.
The present invention may take the form of a computer program product embodied on one or more readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having program code embodied therein. Readable storage media include permanent and non-permanent, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of readable storage media include, but are not limited to: phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes or other magnetic storage devices, or any other non-transmission medium may be used to store information that may be accessed by a computing device.
The present invention is not limited to the above-mentioned embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present invention, in the same or similar way as the above-mentioned embodiments of the present invention.
Claims (10)
1. A protocol analysis method of a programmable network is characterized by comprising the following steps:
(1) the front end side checks the front end format of a custom protocol written by a user based on P4 language; if the P4 protocol code written by the user accords with the constraint of an exchange abstract interface UDF _ SAI encapsulated by the user-defined domain, the protocol code is converted into information in a json format to be output, and if the protocol code does not accord with the constraint of the exchange abstract interface UDF _ SAI, error information is reported;
(2) and the back end side extracts and converts the information required by the UDF _ SAI from the information in the json format and the flow table information configured by the user, operates the ASIC through the UDF _ SAI and finally realizes the analysis of the user-defined network protocol on the ASIC.
2. The protocol parsing method of the programmable network according to claim 1, wherein the step (1) comprises the sub-steps of:
(1.1) carrying out front-end format check on a custom protocol written by a user based on a P4 language, wherein the front-end format check comprises the action check on the modification of a head header, judging whether the front-end format check is in a range supported by the UDF _ SAI, if the front-end format check conforms to the constraint of the UDF _ SAI, outputting a json of an intermediate representation form of a P4 protocol code, and if the front-end format check does not conform to the constraint of the UDF _ SAI, reporting error information;
(1.2) json information output from the front end side includes: the user defines the structure of the data packet head of the protocol, the logical relation of the protocol analysis and the modification information of the head field in the protocol.
3. The protocol parsing method of programmable network according to claim 2, wherein in step (1.2), the header structure of the packet of the user-defined protocol includes the name of the header field and the length of the field.
4. The protocol parsing method of the programmable network according to claim 2, wherein in step (1.2), the logical relationship of the protocol parsing includes parameters and states required by the head jumps of different protocols.
5. The protocol parsing method of programmable network according to claim 2, wherein in step (1.2), the modification information for the header in the protocol includes a table name, a matching key, an action name, and a specific action.
6. The protocol parsing method of the programmable network according to claim 2, wherein the step (2) comprises the sub-steps of:
(2.1) the rear end side extracts the information of the data packet header from the information of the json format, and determines the start bit and the offset of the custom protocol analysis data packet according to the structure of the data packet header and the header field needing to be modified;
(2.2) the back end side extracts matching data and a matching mask from the flow table information configured by the user;
(2.3) the back end side extracts the operation action on the head field from the json format information and extracts the parameter corresponding to the action from the flow table information configured by the user;
(2.4) combining the start bit and the offset extracted in the step (2.1), the matching data and the matching mask extracted in the step (2.2) and the operation action and the action parameter of the header field extracted in the step (2.3) to form all information of the UDF _ SAI required to be extracted by the user;
and (2.5) converting all the information of the UDF _ SAI extracted in the step (2.4) into a UDF _ SAI interface form, and operating the ASIC through the UDF _ SAI to finish the user-defined protocol analysis.
7. The protocol parsing method of the programmable network according to claim 6, wherein in the step (2.2), the flow table information configured by the user includes: the name of the table, the name of the action, the value of the keyword, and the parameter of the action; the matching data is the value of a keyword in the user-configured flow table information.
8. The protocol parsing method of the programmable network of claim 6, wherein the types of matching include exact match and longest prefix match; if the matching type is the longest prefix matching, the length of the matching keyword mask is increased in the flow table information configured by the user; determining a matching value of a data packet header field according to the value and the matching type of a keyword matched with the data packet and the length of a matching keyword mask; if the matching type is accurate matching, adding a default value of a matching keyword mask in flow table information configured by a user, wherein the length of the default value is the bit width of the keyword; and finally, determining the matching value of the data packet header field according to the value of the matched key word of the data packet, the matching type and the length of the matched key word mask.
9. A protocol resolution system of a programmable network, comprising one or more processors for implementing the protocol resolution method of the programmable network according to any one of claims 1 to 8.
10. A readable storage medium, having a program stored thereon, which when executed by a processor, implements a protocol parsing method for a programmable network according to any one of claims 1 to 8.
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