CN106507414B - Message forwarding method and device - Google Patents
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Abstract
The application provides a message forwarding method and a device, wherein the method comprises the following steps: receiving a message, and determining a service type according to the message characteristics of the message; determining a forwarding mode of the message according to the service type; if the forwarding mode is local forwarding, forwarding the message locally; and if the forwarding mode is centralized forwarding, sending the message to a wireless controller (AC) so that the AC makes a strategy for the message and forwards the message. According to the method and the device, the forwarding mode of the message is determined according to the service type, the judgment accuracy of the message forwarding mode can be improved, and the user experience is guaranteed.
Description
Technical Field
The present application relates to the field of network communication technologies, and in particular, to a method and an apparatus for forwarding a packet.
Background
At present, for Wireless network deployment, an AC + AP mode is usually adopted, that is, an AC (Wireless Access Point, Wireless Access controller) centrally manages all APs (Wireless Access points) in a Wireless network, and in the AC + AP mode, there are two forwarding modes for traffic, one of which is centralized forwarding, that is, a tunnel is established between an AP and an AC, all traffic accessed to the AP is transmitted to the AC through the tunnel, and the traffic is forwarded after the AC makes a policy on the traffic, so that the pressure on the AC is large by simply relying on the centralized forwarding; the other is local forwarding, that is, all traffic accessing the AP is directly forwarded locally, which can reduce the pressure of the AC, but cannot make policy (e.g., redirect, audit, etc.) on the traffic.
In the prior art, port-based forwarding is adopted for traffic, that is, a corresponding relationship between a port and a forwarding mode is preconfigured in an AP, for example, a packet pushed by a WEB advertisement needs to be forwarded after being redirected to an AC, and a port carried by the packet is usually 80, so that the forwarding mode corresponding to the port 80 can be configured to be centralized forwarding, so that when the AP receives the packet carried with the port 80, the packet is forwarded to the AC, and other packets are directly forwarded at the AP, however, port-based forwarding has a misjudgment risk, if some websites use a port other than the port 80 for WEB advertisement pushing, the packet can only be locally forwarded at the AP, but cannot be redirected, and in addition, a packet carried with the port 80 is sent to the AC for centralized forwarding, thereby increasing the pressure of the AC. Therefore, the judgment of the message forwarding mode based on port forwarding is not accurate enough, and the user experience is affected.
Disclosure of Invention
In view of this, the present application provides a message forwarding method and apparatus, so as to solve the problem that the existing port-based forwarding may affect the user experience.
According to a first aspect of the embodiments of the present application, a method for forwarding a packet is provided, where the method is applied to a wireless access point AP, and the method includes:
receiving a message, and determining a service type according to the message characteristics of the message;
determining a forwarding mode of the message according to the service type;
if the forwarding mode is local forwarding, forwarding the message locally;
and if the forwarding mode is centralized forwarding, sending the message to a wireless controller (AC) so that the AC makes a strategy for the message and forwards the message.
According to a second aspect of the embodiments of the present application, there is provided a packet forwarding apparatus, where the apparatus is applied to a wireless access point AP, and the apparatus includes:
the receiving unit is used for receiving the message and determining the service type according to the message characteristics of the message;
a determining unit, configured to determine a forwarding manner of the packet according to the service type;
a local forwarding unit, configured to forward the packet locally if the forwarding manner is local forwarding;
and the centralized forwarding unit is used for sending the message to a wireless controller (AC) if the forwarding mode is centralized forwarding so that the AC makes a strategy for the message and forwards the message.
By applying the embodiment of the application, when the AP receives the message, the service type is determined according to the message characteristics of the message, and then the forwarding mode of the message is determined according to the service type; if the forwarding mode is local forwarding, the message is forwarded locally; if the forwarding mode is centralized forwarding, the message is sent to the AC, so that the AC makes a strategy for the message and forwards the message. Based on the implementation mode, after the service type is determined according to the message characteristics of the message, the forwarding mode of the message can be accurately determined according to the service type instead of simply determining the forwarding mode by depending on the port, so that the judgment accuracy of the message forwarding mode can be improved, the message which needs to be subjected to a strategy can be ensured to be forwarded in a centralized manner, the message which does not need to be subjected to the strategy is forwarded locally, the user experience is ensured, meanwhile, the forwarding efficiency of the message is also improved, and the pressure of an AC is reduced.
Drawings
Fig. 1 is a diagram illustrating a message forwarding application scenario according to an exemplary embodiment of the present application;
fig. 2A is a flowchart illustrating an embodiment of a message forwarding method according to an exemplary embodiment of the present application;
FIG. 2B is a diagram illustrating a local forwarding process according to an exemplary embodiment of the present application;
FIG. 2C is a diagram illustrating a centralized forwarding process according to an exemplary embodiment of the present application;
FIG. 3 is a diagram illustrating a hardware configuration of an AP according to an exemplary embodiment of the present application;
fig. 4 is a structural diagram of an embodiment of a message forwarding apparatus according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Fig. 1 is a diagram illustrating a message forwarding application scenario according to an exemplary embodiment of the present application, where fig. 1 includes a wireless client, an AP (two APs are shown in fig. 1), a switch, and an AC. The wireless client can be a mobile terminal, a notebook, etc.; the AP is used for wireless access, namely receiving a message sent by a wireless client in a wireless signal coverage range, and aiming at the received message, if the AP is configured to be intensively forwarded, encapsulating the message into a tunnel message, and transmitting the tunnel message to the AC through a tunnel established with the AC, and if the AP is configured to be locally forwarded, locally forwarding the message; the switch is used for forwarding the message; the AC is used for centralized management of all APs in the wireless network, and also can decapsulate the tunnel message from the AP, make a policy and forward the message.
In the embodiment of the application, for centralized forwarding, because the message needs to be encapsulated and transmitted to the AC through the tunnel, the bandwidth requirements on the AP and the AC interface are high, but the message can be subjected to policy on the AC; for local forwarding, the AP only provides functions of wireless access and message forwarding, and cannot make a policy on a message, but can reduce the pressure of the AC. The application provides a flexible message forwarding scheme, which can accurately transmit the message needing to be subjected to the strategy to the AC for centralized forwarding, and the message not needing to be subjected to the strategy is locally forwarded at the AP. Therefore, the misjudgment probability based on port forwarding can be reduced, the forwarding efficiency of the message can be improved, and the pressure of the AC is reduced.
Fig. 2A is a flowchart illustrating an embodiment of a message forwarding method according to an exemplary embodiment of the present application; FIG. 2B is a diagram illustrating a local forwarding process according to an exemplary embodiment of the present application; fig. 2C is a diagram illustrating a centralized forwarding process according to an exemplary embodiment of the present application, which is applied to an AP, and as shown in fig. 2A, the embodiment includes the following steps:
step 201: receiving a message, and determining the service type according to the message characteristics of the message.
Before step 201 is executed, the AP needs to configure a service type identification table in advance, for example, the AP may first receive a service type to be identified and a protocol feature corresponding to the service type to be identified, which are sent by the AC, and then add the service type to be identified and the corresponding protocol feature to the service type identification table. An exemplary service type identification table is shown in table 1.
TABLE 1
Since the AP is used for wireless access, the AP receives a message sent by the wireless client.
For the process of determining the service type according to the message characteristics of the message, the message characteristics may be protocol characteristics, and the AP may first determine the protocol characteristics of the message and then obtain the corresponding service type from a service type identification table configured in advance according to the protocol characteristics.
Aiming at determining the protocol characteristics of the message, the AP can determine the protocol characteristics according to the combination mode of the port carried by the message and the message content, for example, the port carried by the message header is judged first, the protocol feature corresponding to the port is determined preliminarily, then obtaining key fields from the message content, and judging whether the key fields belong to the protocol characteristics, if so, determining the protocol feature as the protocol feature of the message, if not, determining the protocol feature to which the key fields belong and determining the protocol feature as the protocol feature of the message, if the protocol characteristics can not be determined by using the key fields, the protocol characteristics of the message are represented by a private protocol or a newly released protocol internationally, the AP can not identify, for the message that cannot be identified by the AP, forwarding is performed in a default forwarding manner, and details are described below.
Usually, different ports have different corresponding Protocol features, for example, table 2 is an exemplary table of correspondence between ports and Protocol features, where a Protocol feature corresponding to a 21 port is FTP (File Transfer Protocol), a Protocol feature corresponding to a 25 port is SMTP (Simple Mail Transfer Protocol), a Protocol feature corresponding to a 69 port is TFTP (Simple File Transfer Protocol), and a Protocol feature corresponding to an 80 port is HTTP (hypertext Transfer Protocol). However, some applications may borrow other ports for services, for example, the dog search input method borrows 80 ports for application update, and the message involved in the update process is not based on the HTTP protocol, so as to avoid the inaccuracy of determining the protocol features by using the ports alone, key fields belonging to the protocol features are usually included in the message content, for example, the key fields included in the HTTP protocol features may be GET/POST, HOST, Connect, and the like. Therefore, the protocol characteristics are determined by combining the port and the message content, and the judgment accuracy of the protocol characteristics can be improved.
| Port number | Protocol features |
| 21 | FTP |
| 25 | SMTP |
| 69 | TFTP |
| 80 | HTTP |
TABLE 2
For example, a port carried by a header of a message received by the AP is 80, it may be preliminarily determined that the protocol feature is an HTTP protocol, and then key fields obtained from the message content include GET and HOST, and since the GET and HOST belong to the key fields included in the HTTP protocol, it may be further determined that the protocol feature is the HTTP protocol, and the corresponding service type may be obtained from table 1 as a WEB advertisement push service.
Based on the description of step 201, since the AC can uniformly manage all the APs in the wireless network, the service type to be identified and the corresponding protocol feature can be sent to all the APs through the AC, so that the APs configure the service type identification table according to the service type to be identified and the corresponding protocol feature, and do not need to use a special management device to configure the APs one by one, thereby simplifying the configuration process of each AP. In addition, the AP determines the protocol characteristics through a mode of combining the port and the message content instead of determining the protocol characteristics by only depending on the port, so that the protocol characteristics of the message can be determined more accurately.
Step 202: and determining the forwarding mode of the message according to the service type.
In one example, the AP may search for a preconfigured service type according to the service type; if the forwarding mode is found, the forwarding mode is determined to be centralized forwarding, and if the forwarding mode is not found, the forwarding mode is determined to be local forwarding.
The method mainly aims to determine which service type messages need to be transmitted to an AC for policy making and then to be forwarded, and for service type messages which do not need to be policy making, local forwarding is utilized, so that the AC can configure the service types which need to be forwarded in a centralized manner to an AP (access point), and then the AP can judge whether the service types exist in the service types which are configured in advance after determining the corresponding service types, if so, the messages need to be forwarded in a centralized manner, and if not, the messages need to be forwarded in a local manner.
In another example, the AP may pre-configure a forwarding table, that is, the AP may receive a service type and a forwarding manner sent by the AC, and then add the service type and the forwarding manner to the forwarding table correspondingly. An exemplary forwarding table is shown in table 3.
| Type of service | Forwarding mode |
| Download service | Local forwarding |
| Mail service | Centralized forwarding |
| WEB advertisement push service | Centralized forwarding |
TABLE 3
After configuring the forwarding table, the AP may obtain a corresponding forwarding manner from a pre-configured forwarding table according to the service type.
It should be noted that the AP may configure a default forwarding manner to avoid determining the service type according to the message feature of the message, or when the forwarding manner cannot be determined according to the service type, the default forwarding manner may be determined as the forwarding manner of the message, for example, the AP may set the local forwarding as the default forwarding manner.
As can be seen from the description in step 201 and step 202, the AP may determine the service type of the packet through the service type identification table, and then may accurately determine the forwarding manner of the packet according to the service type.
Step 203: if the forwarding mode is local forwarding, the message is forwarded locally.
Specifically, the AP may locally forward the packet according to a corresponding forwarding rule, and those skilled in the art can understand that the forwarding rule may be a routing table or an Address Resolution Protocol (ARP) cache table, and detailed forwarding procedures of the present application are not described in detail herein.
As an exemplary scenario, as shown in fig. 2B, after the AP forwards the packet to the switch according to the corresponding forwarding rule, the switch forwards the packet to the network.
Step 204: if the forwarding mode is centralized forwarding, the message is sent to the AC, so that the AC makes a strategy for the message and forwards the message.
Specifically, since the AP and the AC interact through a tunnel, the AP needs to encapsulate a message into a tunnel message by using preset tunnel information, and then transmit the tunnel message to the AC through the tunnel, and the AC decapsulates the tunnel message to obtain a message, and then performs a corresponding policy on the message, for example, the message pushed by a WEB advertisement needs to be redirected, and finally the AC forwards the message according to a corresponding forwarding rule, which can be understood by those skilled in the art, where the forwarding rule may be a routing table or an Address Resolution Protocol (ARP) cache table, and detailed forwarding processes are not described in detail herein.
As an exemplary scenario, as shown in fig. 2C, the AP encapsulates the packet into a tunnel packet by using preset tunnel information, and transmits the tunnel packet to the AC through the tunnel, the AC decapsulates the tunnel packet to obtain the packet, and after performing a corresponding policy on the packet, forwards the packet to the switch according to a corresponding forwarding rule, and the switch forwards the packet to the network.
It should be noted that, after the AC applies a corresponding policy to the packet, the AC may perform source NAT translation on the packet, that is, convert a source IP (Internet Protocol) address and a source port of the packet into an IP address and a port of the AC, and then forward the packet to the switch, so as to ensure that a returned response packet can be sent to the AC, and the AC encapsulates the response packet into a tunnel packet and transmits the tunnel packet to the AP through the tunnel, and after the AP decapsulates the response packet, the response packet is forwarded to the wireless client.
It can be known from the above embodiments that, when receiving a message, an AP determines a service type according to message characteristics of the message, and then determines a forwarding mode of the message according to the service type; if the forwarding mode is local forwarding, the message is forwarded locally; if the forwarding mode is centralized forwarding, the message is sent to the AC, so that the AC makes a strategy for the message and forwards the message. Based on the implementation mode, after the service type is determined according to the message characteristics of the message, the forwarding mode of the message can be accurately determined according to the service type instead of simply determining the forwarding mode by depending on the port, so that the judgment accuracy of the message forwarding mode can be improved, the message which needs to be subjected to a strategy can be ensured to be forwarded in a centralized manner, the message which does not need to be subjected to the strategy is forwarded locally, the user experience is ensured, meanwhile, the forwarding efficiency of the message is also improved, and the pressure of an AC is reduced.
Corresponding to the embodiment of the message forwarding method, the application also provides an embodiment of a message forwarding device.
The embodiment of the message forwarding device can be applied to the AP. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. The software implementation is taken as an example, and is formed by reading corresponding computer program instructions in the nonvolatile memory into the memory for operation through the processor of the device where the software implementation is located as a logical means. In terms of hardware, as shown in fig. 3, a hardware structure diagram of an AP according to an exemplary embodiment is shown in this application, except for the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 3, a device where the apparatus in the embodiment is located may also include other hardware according to an actual function of the device, which is not described again.
Fig. 4 is a structural diagram of an embodiment of a message forwarding apparatus according to an exemplary embodiment of the present application, where the embodiment is applied to an AP, and as shown in fig. 4, the apparatus includes: a receiving unit 410, a determining unit 420, a local forwarding unit 430, and a centralized forwarding unit 440.
The receiving unit 410 is configured to receive a message, and determine a service type according to a message feature of the message;
a determining unit 420, configured to determine a forwarding manner of the packet according to the service type;
a local forwarding unit 430, configured to forward the packet locally if the forwarding manner is local forwarding;
and a centralized forwarding unit 440, configured to send the packet to a wireless controller AC if the forwarding manner is centralized forwarding, so that the AC makes a policy on the packet and forwards the packet.
In an optional implementation manner, the message feature is a protocol feature, and the receiving unit 410 is specifically configured to determine the protocol feature of the message in a process of determining a service type according to the message feature of the message; and acquiring the corresponding service type from a service type identification table configured in advance according to the protocol characteristics.
In another alternative implementation, the apparatus further comprises (not shown in fig. 4):
a first configuration unit, configured to specifically receive a service type to be identified and a protocol feature corresponding to the service type to be identified, where the service type to be identified is sent by the AC; and adding the service type to be identified and the corresponding protocol characteristic into a service type identification table.
In another optional implementation manner, the determining unit 420 is specifically configured to search for a preconfigured service type according to the service type; if the forwarding mode is found, determining that the forwarding mode is centralized forwarding, and if the forwarding mode is not found, determining that the forwarding mode is local forwarding; or acquiring a corresponding forwarding mode from a pre-configured forwarding table according to the service type.
In another alternative implementation, the apparatus further comprises (not shown in fig. 4):
a second configuration unit, configured to specifically receive the service type and the forwarding manner sent by the AC; and correspondingly adding the service type and the forwarding mode into the forwarding table.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
It can be known from the above embodiments that, when receiving a message, an AP determines a service type according to message characteristics of the message, and then determines a forwarding mode of the message according to the service type; if the forwarding mode is local forwarding, the message is forwarded locally; if the forwarding mode is centralized forwarding, the message is sent to the AC, so that the AC makes a strategy for the message and forwards the message. Based on the implementation mode, after the service type is determined according to the message characteristics of the message, the forwarding mode of the message can be accurately determined according to the service type instead of simply determining the forwarding mode by depending on the port, so that the judgment accuracy of the message forwarding mode can be improved, the message which needs to be subjected to a strategy can be ensured to be forwarded in a centralized manner, the message which does not need to be subjected to the strategy is forwarded locally, the user experience is ensured, meanwhile, the forwarding efficiency of the message is also improved, and the pressure of an AC is reduced.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (12)
1. A message forwarding method is applied to a wireless Access Point (AP), and the method comprises the following steps:
receiving a message, and determining a service type according to the message characteristics of the message, wherein the service type is used for representing an application corresponding to the message;
determining a forwarding mode of the message according to the service type;
if the forwarding mode is local forwarding, forwarding the message locally;
and if the forwarding mode is centralized forwarding, sending the message to a wireless controller (AC) so that the AC makes a strategy for the message and forwards the message.
2. The method according to claim 1, wherein the packet feature is a protocol feature, and the process of determining the service type according to the packet feature of the packet specifically includes:
determining the protocol characteristics of the message;
and acquiring the corresponding service type from a service type identification table configured in advance according to the protocol characteristics.
3. The method according to claim 2, wherein the process of configuring the service type identification table specifically includes:
receiving the service type needing to be identified and the protocol characteristic corresponding to the service type needing to be identified, which are sent by the AC;
and adding the service type to be identified and the corresponding protocol characteristic into a service type identification table.
4. The method according to claim 1, wherein the process of determining the forwarding manner of the packet according to the service type specifically includes:
searching a preset service type according to the service type; if the forwarding mode is found, determining that the forwarding mode is centralized forwarding, and if the forwarding mode is not found, determining that the forwarding mode is local forwarding; or,
and acquiring a corresponding forwarding mode from a pre-configured forwarding table according to the service type.
5. The method according to claim 4, wherein the process of pre-configuring the forwarding table specifically comprises:
receiving the service type and the forwarding mode sent by the AC;
and correspondingly adding the service type and the forwarding mode into the forwarding table.
6. A message forwarding device, which is applied to a wireless Access Point (AP), the device comprising:
the receiving unit is used for receiving a message and determining a service type according to the message characteristics of the message, wherein the service type is used for representing the application corresponding to the message;
a determining unit, configured to determine a forwarding manner of the packet according to the service type;
a local forwarding unit, configured to forward the packet locally if the forwarding manner is local forwarding;
and the centralized forwarding unit is used for sending the message to a wireless controller (AC) if the forwarding mode is centralized forwarding so that the AC makes a strategy for the message and forwards the message.
7. The apparatus according to claim 6, wherein the packet characteristic is a protocol characteristic, and the receiving unit is specifically configured to determine the protocol characteristic of the packet in a process of determining a service type according to the packet characteristic of the packet; and acquiring the corresponding service type from a service type identification table configured in advance according to the protocol characteristics.
8. The apparatus of claim 7, further comprising:
a first configuration unit, configured to specifically receive a service type to be identified and a protocol feature corresponding to the service type to be identified, where the service type to be identified is sent by the AC; and adding the service type to be identified and the corresponding protocol characteristic into a service type identification table.
9. The apparatus according to claim 6, wherein the determining unit is specifically configured to search for a preconfigured service type according to the service type; if the forwarding mode is found, determining that the forwarding mode is centralized forwarding, and if the forwarding mode is not found, determining that the forwarding mode is local forwarding; or acquiring a corresponding forwarding mode from a pre-configured forwarding table according to the service type.
10. The apparatus of claim 9, further comprising:
a second configuration unit, configured to specifically receive the service type and the forwarding manner sent by the AC; and correspondingly adding the service type and the forwarding mode into the forwarding table.
11. An electronic device, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor implements the method of any one of claims 1-5 by executing the executable instructions.
12. A computer-readable storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the method according to any one of claims 1-5.
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| CN110062059B (en) * | 2019-04-25 | 2021-09-28 | 武汉思创易控科技有限公司 | Data transmission interaction method and system for port network |
| CN111277959B (en) * | 2020-01-16 | 2021-11-26 | 新华三技术有限公司成都分公司 | Message forwarding method and device |
| CN111698177B (en) * | 2020-04-23 | 2022-10-21 | 新华三技术有限公司 | Message processing method and device |
| CN113079518A (en) * | 2021-03-29 | 2021-07-06 | 新华三技术有限公司 | Message forwarding method, device and equipment |
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