CN104125191B - Processing method, equipment and the system of point-to-point protocol based on Ethernet - Google Patents

Abstract

A processing method, device and system for an Ethernet-based point-to-point protocol. The invention provides a PPPoE processing method, equipment and system. The method comprises that the forwarding device receives the PPPoE control packet sent by the PPPoE client; the forwarding device sends the PPPoE control packet to the control device; the forwarding device receives the first information sent by the control device, and the first One information is the information required by the PPPoE client to send the first PPPoE data message, which is distributed by the control device according to the PPPoE control message; the forwarding device sends the first information to the PPPoE client end. The embodiment of the present invention can support PPPoE in the scene of separation of control and forwarding, and then can realize PPPoE on the SDN device.

Description

Processing method, device and system of Ethernet-based point-to-point protocol

technical field

The present invention relates to communication technology, and in particular to a processing method, device and system of an Ethernet-based point-to-point protocol (Point to Point Protocol over Ethernet, PPPoE).

Background technique

A software-defined network (Software Defined Network, SDN) can provide an open network interface and provide network development-related applications for network equipment vendors, network operators, or third parties. Openflow protocol (Openflow, OF) is the key technology of SDN. OF is based on the architecture of separation of control and forwarding, including OF controller and OF switch. OF controller can be responsible for the processing of various protocols, running applications, and external Provide a programming interface; the OF controller can issue a flow table to the OF switch, and the OF switch forwards based on the flow table.

PPPoE is a protocol widely used by network operators, and the current PPPoE is implemented inside a single device. The current OF does not yet support PPPoE service processing, making PPPoE unable to be supported in SDN-based network equipment.

Contents of the invention

In view of this, the embodiments of the present invention provide a PPPoE processing method, device, and system to solve the problem that PPPoE cannot be supported in a scenario where control and forwarding are separated.

In the first aspect, a PPPoE processing method is provided, including:

The forwarding device receives the PPPoE control packet sent by the PPPoE client;

The forwarding device sends the PPPoE control packet to the control device;

The forwarding device receives the first information sent by the control device, the first information is the information required by the PPPoE client to send the first PPPoE data message, and the control device sends the first PPPoE data message according to the PPPoE control message distribute;

The forwarding device sends the first information to the PPPoE client.

In combination with the first aspect, in the first possible implementation of the first aspect,

The forwarding device sends the PPPoE control packet to the control device according to the received first flow table;

The forwarding device sends the first information to the PPPoE client according to the received second flow table.

In combination with the first aspect or the first possible implementation of the first aspect, in the second possible implementation of the first aspect,

The PPPoE control message includes a control message applied to the PPPoE discovery phase, and the first information includes a first session identification ID;

or,

The PPPoE control message includes a control message applied to the PPPoE session phase, and the first information includes a first IP address;

or,

The PPPoE control message includes a control message used in a PPPoE discovery phase and a control message used in a PPPoE session phase, and the first information includes a first session ID and a first IP address.

With reference to the first aspect or the first possible implementation of the first aspect or the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the PPPoE control The message sent to the control device specifically includes:

Encapsulating the PPPoE control message into an open flow OF message;

Send the OF packet to the control device.

With reference to the first aspect or any of the first to second possible implementations of the first aspect, in a fourth possible implementation of the first aspect, after sending the first information to the PPPoE After the client, the method also includes:

The forwarding device receives the first PPPoE data packet sent by the PPPoE client;

The forwarding device determines whether the session ID of the first PPPoE data message is the first session ID, and determines whether an IP message is encapsulated in the first PPPoE data message;

When the session ID of the first PPPoE data message is the first session ID and the IP message is encapsulated in the first PPPoE data message, the forwarding device according to the received third flow table, Decapsulating the first PPPoE data packet into a first public network data packet;

The forwarding device sends the first public network data packet to the public network according to the third flow table.

In combination with the first aspect or any of the first to fourth possible implementations of the first aspect, in the fifth possible implementation of the first aspect,

After sending the first information to the PPPoE client, the method further includes:

The forwarding device receives the second public network data message from the public network;

The forwarding device determines whether the destination address of the second public network data packet is the first IP address;

After the forwarding device determines that the destination address of the second public network data message is the first IP address, according to the received fourth flow table, the second public network data message is encapsulated into the first Two PPPoE data packets;

The forwarding device sends the second PPPoE data packet to the PPPoE client according to the received fourth flow table.

With reference to the fourth possible implementation of the first aspect, in a sixth possible implementation of the first aspect, the first public network data message includes:

An Internet Protocol IP packet, an Ethernet-based Internet Protocol IPoE packet, or an Asynchronous Transfer Mode-based Internet Protocol IPoA packet.

In the second aspect, a PPPoE processing method is provided, including:

The control device receives the PPPoE control packet sent by the forwarding device;

The control device allocates first information to the PPPoE client according to the PPPoE control message, and the first information is the information required for the PPPoE client to send the first PPPoE data message;

The control device sends the first information to the forwarding device.

In combination with the second aspect, in the first possible implementation of the second aspect,

The PPPoE control message includes a control message applied to the PPPoE discovery phase, and the first information includes a first session identification ID;

or,

The PPPoE control message includes a control message applied to the PPPoE session phase, and the first information includes a first IP address;

or,

The PPPoE control message includes a control message used in a PPPoE discovery phase and a control message used in a PPPoE session phase, and the first information includes a first session ID and a first IP address.

With reference to the second aspect or the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the receiving and forwarding device sends the PPPoE control message, including:

receiving an OpenFlow OF packet sent by the forwarding device, where the OF packet is obtained after the forwarding device encapsulates the PPPoE control packet.

In a third aspect, a forwarding device is provided, including:

The receiver is used to receive the PPPoE control message sent by the PPPoE client;

a transmitter, configured to send the PPPoE control packet received by the receiver to a control device;

The receiver is also used to: receive the first information sent by the control device, the first information is the information required by the PPPoE client to send the first PPPoE data message, and the control device according to the PPPoE control packet distribution;

The sender is further configured to: send the first information received by the receiver to the PPPoE client.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the transmitter is specifically configured to:

sending the PPPoE control packet received by the receiver to the control device according to the received first flow table;

Send the first information to the PPPoE client according to the received second flow table.

In combination with the third aspect or the first possible implementation of the third aspect, in the second possible implementation of the third aspect,

The PPPoE control message received by the receiver includes a control message applied to the PPPoE discovery phase, and the first information received by the receiver includes a first session ID;

or,

The PPPoE control packet received by the receiver includes a control packet applied to the PPPoE session phase, and the first information received by the receiver includes a first IP address;

or,

The PPPoE control message received by the receiver includes a control message applied to the PPPoE discovery phase and a control message applied to the PPPoE session phase, and the first information received by the receiver includes a first session identification ID and the first IP address.

In combination with the third aspect or the first possible implementation manner of the third aspect or the second possible implementation manner of the third aspect, in the third possible implementation manner of the third aspect, further comprising: a processor.

In combination with the third possible implementation of the third aspect, in the fourth possible implementation of the third aspect,

The receiving processor is used to encapsulate the PPPoE control message received by the receiver into an Open Flow OF message before the sender sends the PPPoE control message;

The sender is specifically configured to send the OF packet to the control device.

In combination with the third possible implementation of the third aspect or the fourth possible implementation of the third aspect, in the fifth possible implementation of the third aspect,

The receiver is also used to receive the first PPPoE data packet sent by the PPPoE client;

The processor is configured to: determine whether the session ID of the first PPPoE data message is the first session ID, and determine whether an IP message is encapsulated in the first PPPoE data message; and, in the The session ID of the first PPPoE data message is the first session ID, and when the IP message shown is encapsulated in the first PPPoE data message, the first PPPoE data message is sent according to the received third flow table The data packet is decapsulated into a first public network data packet;

The sender is further configured to: send the first public network data packet to the public network according to the third flow table.

In combination with any of the third to fifth possible implementations of the third aspect, in the sixth possible implementation of the third aspect,

The receiver is further configured to: receive a second public network data message from the public network;

The processor is configured to: determine whether the destination address of the second public network data packet is the first IP address; and determine whether the destination address of the second public network data packet is the first IP address; After the IP address, the second public network data packet is encapsulated into a second PPPoE data packet according to the received fourth flow table;

The sender is further configured to: send the second PPPoE data packet to the PPPoE client according to the fourth flow table.

With reference to the fifth possible implementation of the third aspect, in a seventh possible implementation of the third aspect, the first public network data packet obtained by the processor includes:

An Internet Protocol IP packet, an Ethernet-based Internet Protocol IPoE packet, or an Asynchronous Transfer Mode-based Internet Protocol IPoA packet.

In a fourth aspect, a control device is provided, including:

The receiver is used to receive the PPPoE control message sent by the forwarding device;

A processor, configured to assign first information to the PPPoE client according to the PPPoE control packet received by the receiver, where the first information is information required by the PPPoE client to send a first PPPoE data packet;

a sender, configured to send the first information obtained by the processor to the forwarding device.

In combination with the fourth aspect, in the first possible implementation of the fourth aspect,

The PPPoE control message received by the receiver includes a control message applied to a PPPoE discovery phase, and the first information obtained by the processor includes a first session ID;

or,

The PPPoE control message received by the receiver includes a control message applied to the PPPoE session phase, and the first information obtained by the processor includes a first IP address;

or,

The PPPoE control message received by the receiver includes a control message applied to the PPPoE discovery phase and a control message applied to the PPPoE session phase, and the first information obtained by the processor includes a first session identification ID and the first IP address.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the receiver is specifically configured to:

receiving an OpenFlow OF packet sent by the forwarding device, where the OF packet is obtained after the forwarding device encapsulates the PPPoE control packet.

In the fifth aspect, a PPPoE processing system is provided, including:

The forwarding device in the third aspect or any possible implementation manner in the third aspect, and the control device in the fourth aspect or any possible implementation manner in the fourth aspect.

Through the above technical solution, the PPPoE control message sent by the PPPoE client is sent to the control device through the forwarding device, and the first information allocated by the control device and required for the PPPoE client to send the first PPPoE data message is allocated to the PPPoE The client terminal is configured to enable the PPPoE client terminal to obtain the first information, so as to provide help for the PPPoE client terminal to realize the transmission of PPPoE data packets.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the schematic diagram of PPPoE communication in the embodiment of the present invention;

Fig. 2 is the schematic diagram of PPPoE message in the embodiment of the present invention;

Fig. 3 is a schematic diagram of the flow table structure of OF in the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a matching domain of a flow table in an embodiment of the present invention;

Fig. 5 is the schematic flow chart that OF supports PPPoE realization in the embodiment of the present invention;

FIG. 6 is a schematic flow diagram of an embodiment of a PPPoE processing method in the present invention;

FIG. 7 is a schematic flowchart of another embodiment of the PPPoE processing method of the present invention;

FIG. 8 is a schematic flowchart of another embodiment of the PPPoE processing method of the present invention;

FIG. 9 is a schematic flowchart of an embodiment of processing data packets in the embodiment of the present invention;

FIG. 10 is a schematic flowchart of another embodiment of processing data packets in the embodiment of the present invention;

FIG. 11 is a schematic flow diagram of decapsulating a data packet in an embodiment of the present invention;

FIG. 12 is a schematic diagram of message formats before and after decapsulation in an embodiment of the present invention;

FIG. 13 is a schematic flow diagram of encapsulating data packets in an embodiment of the present invention;

FIG. 14 is a schematic diagram of message formats before and after encapsulation in an embodiment of the present invention;

FIG. 15 is a schematic flowchart of another embodiment of the PPPoE processing method of the present invention;

FIG. 16 is a schematic structural diagram of an embodiment of a forwarding device according to the present invention;

FIG. 17 is a schematic structural diagram of another embodiment of a forwarding device according to the present invention;

Fig. 18 is a schematic structural diagram of an embodiment of the control device of the present invention;

FIG. 19 is a schematic structural diagram of an embodiment of a PPPoE processing system according to the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

PPPoE communication can be divided into two stages: discovery (discovery) stage and session (session) stage. The discovery phase is used for the PPPoE client and the PPPoE server to obtain the peer’s Media Access Control (MAC) address from each other, and the PPPoE server assigns a session ID (session ID) to the PPPoE client; the session phase includes the subsequent link control protocol (Link Control Protocol, LCP) negotiation, Network Control Protocol (NetworkControl Protocol, NCP) negotiation, authentication and authorization, and sending and receiving user data packets.

Referring to Figure 1, the discovery phase includes the PPPoE Active Discovery Initiation (PADI) message, the PPPoE Active Discovery Offer (PADO) message, and the PPPoE Active Discovery Interaction between request (PPPoE Active Discovery Request, PADR) message and PPPoE active discovery session confirmation (PPPoE Active Discovery Session confirmation, PADS) message.

The session phase includes the PPP negotiation process and the data packet sending and receiving process after the user goes online. The PPP negotiation process includes the LCP negotiation of 5 and the NCP negotiation of 11. The LCP negotiation process includes the authentication and authorization of 6-10. After the user goes online, the user can send or receive data packets to or from the network side. During authentication and authorization, the PPPoE server can interact with the Authentication Authorization and Accounting (AAA) server.

As shown in Figure 2, the PPPoE packet includes the destination address (destination_address), source address (source_address) and Ethernet type (ether_type) in the Ethernet header, the PPPoE packet (PPPoEpacket) as the payload, and the checksum (checksum ). The PPPoE packet includes version (ver), type (type), code (code), session ID (session_ID), length (length) and PPP packet (PPP packet). PPP packets include protocol (protocol), IP packets (IP packet) and padding. The length of each field is also shown in FIG. 2 .

In the discovery phase, the value of the Ether_type field is 0x8863, and in the session phase, the value of the Ether_type field is 0x8864.

The code (code) field in the PPPoE message header indicates the type of the message, for example, the code of the PADI message is 0x09, the code of the PADO message is 0x07, etc.; in the session phase, the code is 0.

The session ID can be used to identify a link, and it can be considered that there is a one-to-one correspondence between the session ID and the user's IP address.

The protocol field in the PPP packet header indicates the type of the PPP packet. For example, 0xC021 indicates an LCP packet, 0x8021 indicates an NCP packet, and 0x0021 indicates an IP packet.

Taking the control device and the forwarding device as an OF controller and an OF switch as an example, the OF switch can process the message according to the flow table sent by the OF controller, as shown in Figure 3, which is a schematic diagram of the OF flow table structure, including Match fields (match fields), priority (priority), counters (counters), instructions (instructions), timeouts (timeouts), cache data (cookies).

The basic structure of the flow table is a match plus operation. For example, in order to support Layer 2 forwarding, the flow table can require that if the destination MAC address of a packet matches the specified MAC address, an action will be performed: forward it from the B port of the switch. At this point, you can add the destination MAC address as the specified MAC address in the match fields of the flow table, and add the first instruction in the instructions, which is used to indicate "forward from the B port of the switch ", when the switch receives the message whose destination MAC address is the specified MAC address, it can forward the message from the B port of the switch.

As shown in Figure 4, match fields include type (type), length (length) and openflow extension match field (Openflow extension match, oxm_field), where oxm_field can be multiple, and each oxm_field can identify a specified field, in order to process the matched packets with the operation indicated by instructions.

The current OF can match the fields in the packet, including the Ethernet header, IP header, and Multi-Protocol Label Switching (Multi-Protocol Label Switching, MPLS) header, but has not yet included PPPoE-related fields.

In order to support PPPoE, the openflow protocol and related controllers and switches need to support the following functions:

(1) The OF switch needs to be able to identify the PPPoE control message and forward it to the OF controller, and also forward the PPPoE control message returned by the OF controller to the CPE.

(2) The OF controller needs to be able to process PPPoE control packets, including Session ID allocation, authentication and authorization (which can be realized in cooperation with other servers), user IP address allocation, link keep-alive, and be able to Send the flow table to the OF switch to forward user data packets (including encapsulation and decapsulation of PPPoE packets, etc.).

(3) The OF switch needs to be able to forward PPPoE data packets according to the flow table, including encapsulation and decapsulation of PPPoE packets.

(4) The OF protocol needs to be able to identify the relevant fields of the PPPoE protocol and define corresponding processing operations.

In order to realize OF's support for PPPoE, a new definition of oxm_field can be added to the existing structure. For example, the definition of oxm_field is as follows:

Among them, the above-mentioned OFPXMT_OFB_PPPOE_SESSION_ID=40 and OFPXMT_OFB_PPPOE_PPP_PROTO=41 are newly added definitions, which are used to match the session ID field and the protocol field of the message.

In addition, in order to support the encapsulation and decapsulation of the PPPoE packet header, the instructions part of the OF flow table needs to be extended. For example, the instructions are defined as follows:

Among them, the above-mentioned OFPAT_PUSH_PPPOE_HEADER=28 and OFPAT_POP_PPPOE_HEADER=29 are newly added definitions, which are respectively used to indicate encapsulation and decapsulation operations.

Through the above expansion, see Figure 5, the OF switch can send the PPPoE control packet sent by the PPPoE client to the OF controller, and the OF controller sends it to the PPPoE server, and the OF controller can send the session ID assigned by the PPPoE server And the IP address is sent to the PPPoE client through the OF switch. The OF switch can decapsulate the PPPoE data packet sent by the PPPoE client into an Ethernet-based Internet Protocol (Internet Protocol over Ethernet, IPoE) data packet and send it to the network side, and encapsulate the IPoE data packet sent by the network side It is sent to the PPPoE client as a PPPoE data packet. The OF switch can complete the above operations such as forwarding or encapsulation and decapsulation according to the flow table issued by the OF controller.

Fig. 6 is a schematic flow chart of an embodiment of the PPPoE processing method of the present invention, including:

61: The forwarding device receives the PPPoE control packet sent by the PPPoE client;

62: The forwarding device sends the PPPoE control packet to the control device;

63: The forwarding device receives the first information sent by the control device, the first information is the information required by the PPPoE client to send the first PPPoE data packet, and the control device controls according to the PPPoE message distribution;

64: The forwarding device sends the first information to the PPPoE client.

Optionally,

The forwarding device sends the PPPoE control packet to the control device according to the received first flow table;

The forwarding device sends the first information to the PPPoE client according to the received second flow table.

The first flow table and the second flow table may be sent by the control device, or may be sent by other devices.

Optionally, the PPPoE control message includes a control message applied to the PPPoE discovery phase, and the first information includes a first session ID;

or,

The PPPoE control message includes a control message applied to the PPPoE session phase, and the first information includes a first IP address;

or,

The PPPoE control message includes a control message used in a PPPoE discovery phase and a control message used in a PPPoE session phase, and the first information includes a first session ID and a first IP address.

Optionally, the sending the PPPoE control message to the control device specifically includes: encapsulating the PPPoE control message into an Open Flow (English full name Open Flow, English abbreviation OF) message; sent to the control device. That is to say, the PPPoE control packet received by the control device is encapsulated in the OF packet.

Since the forwarding device sends the first information to the PPPoE client, the PPPoE client can send the first PPPoE data packet based on the first information.

Optionally, after sending the first information to the PPPoE client, the method further includes:

The forwarding device receives the first PPPoE data packet sent by the PPPoE client;

The forwarding device determines whether the session ID of the first PPPoE data message is the first session ID, and determines whether an IP message is encapsulated in the first PPPoE data message;

When the session ID of the first PPPoE data packet is the first session ID and the IP packet is encapsulated in the first PPPoE data packet, the forwarding device, according to the received third flow table, decapsulating the first PPPoE data packet into a first public network data packet according to the third flow table;

The forwarding device sends the first public network data packet to the public network.

Optionally, after sending the first information to the PPPoE client, the method further includes:

The forwarding device receives the second public network data message from the public network;

The forwarding device determines whether the destination address of the second public network data packet is the first IP address;

After the forwarding device determines that the destination address of the second public network data message is the first IP address, according to the received fourth flow table, the second public network data message is encapsulated into the first Two PPPoE data packets;

The forwarding device sends the second PPPoE data packet to the PPPoE client according to the fourth flow table.

Optionally, the method also includes:

The forwarding device receives the third flow table sent by the control device, the third flow table includes a third matching field and a third operation field, the third matching field includes a session ID field and a protocol field, and the The value of the session ID field is the value of the first session ID, the value of the protocol field is a value indicating that the packet is an IP packet, and the operation of the third operation domain includes matching the third matching domain The packet is decapsulated into a public network data packet and sent to the network side. In order to realize the above decapsulation of the first PPPoE data packet into the first public network data packet.

It should be noted that the third flow table in this embodiment may have multiple implementation manners, and the third flow table in this embodiment is only one of the multiple implementation manners. In addition, the third flow table may be received from the control device, and may be received from other devices.

Optionally, the method also includes:

The forwarding device receives the fourth flow table sent by the control device, the fourth flow table includes a fourth matching field and a fourth operation field, the fourth matching field includes a destination IP address field, and the destination IP The value of the address field is the value of the first IP address, and the operation of the fourth operation field includes encapsulating the packet matching the fourth matching field into a PPPoE data packet and sending it to the PPPoE client. In order to implement the above encapsulation of the second public network data packet into a second PPPoE data packet.

It should be noted that the fourth flow table in this embodiment may have multiple implementation manners, and the fourth flow table in this embodiment is only one of the multiple implementation manners. In addition, the fourth flow table may be received from the control device, and may be received from other devices.

Optionally, the first public network data message includes:

An Internet Protocol (IP) message, an Ethernet-based Internet Protocol (IP overEthernet, IPoE) message, or an Asynchronous Transfer Mode (ATM)-based Internet Protocol (IP over ATM, IPoA) message.

Optionally, the second public network data packet includes: an IP packet, an IPoE packet, or an IPoA packet.

Optionally, the forwarding device receives the third flow table sent by the control device after completing PPPoE negotiation and PPP negotiation; or,

After the forwarding device receives the first data message sent by the PPPoE client and forwards it to the control device, it receives the third flow table sent by the control device, wherein the first data message is The forwarding device forwards to the control device according to the first principle, the first principle includes: the first data packet cannot match the matching field of the existing flow table on the forwarding device, or, the The first data packet can be matched to the matching field of the existing flow table on the forwarding device, and the corresponding operation field indicates that the matched packet is sent to the control device.

Optionally, the forwarding device receives the fourth flow table sent by the control device, including:

After the forwarding device completes PPPoE negotiation and PPP negotiation, it receives the fourth flow table sent by the control device; or,

The forwarding device receives the fourth flow table sent by the control device, and the fourth flow table is sent by the control device after receiving the first data message to be sent to the PPPoE client sent by the network side; or,

After the forwarding device receives the first data message sent by the PPPoE client and forwards it to the control device, it receives the fourth flow table sent by the control device, wherein the first data message is the The forwarding device forwards to the control device according to the first principle, the first principle includes: the first data packet cannot match the matching field of the existing flow table on the forwarding device, or the first A data packet can be matched to the matching field of the existing flow table on the forwarding device, and the corresponding operation field indicates that the matched packet is sent to the control device.

Optionally, the method also includes:

The forwarding device receives the deletion instruction sent by the control device, and deletes the stored flow table. The deletion instruction is sent by the control device after detecting a link failure between the PPPoE server and the PPPoE client.

Correspondingly, referring to FIG. 7, it is a schematic flow chart of another embodiment, including:

71: The control device receives the PPPoE control packet sent by the forwarding device;

72: The control device allocates first information to the PPPoE client according to the PPPoE control packet, where the first information is information required by the PPPoE client to send a first PPPoE data packet;

73: The control device sends the first information to the forwarding device.

Optionally, the PPPoE control message includes a control message applied to the PPPoE discovery phase, and the first information includes a first session ID;

or,

The PPPoE control message includes a control message applied to the PPPoE session phase, and the first information includes a first IP address;

or,

The PPPoE control message includes a control message used in a PPPoE discovery phase and a control message used in a PPPoE session phase, and the first information includes a first session ID and a first IP address.

Optionally, the receiving and forwarding device sends the PPPoE control message, including:

receiving an OpenFlow OF packet sent by the forwarding device, where the OF packet is obtained after the forwarding device encapsulates the PPPoE control packet.

Optionally, the PPPoE control packet received by the control device is sent by the forwarding device according to the first flow table received from the control device.

Optionally, the method also includes:

The control device sends a third flow table to the forwarding device, the third flow table includes a third matching field and a third operation field, the third matching field includes a session ID field and a protocol field, and the session The value of the ID field is the value of the first session ID, the value of the protocol field is a value indicating that the packet is an IP packet, and the operation of the third operation field includes matching with the third matching field The packet is decapsulated into a public network data packet and sent to the network side.

Optionally, the method also includes:

The control device sends a fourth flow table to the forwarding device, the fourth flow table includes a fourth matching field and a fourth operation field, the fourth matching field includes a destination IP address field, and the destination IP address The value of the field is the value of the first IP address, and the operation of the fourth operation field includes encapsulating the packet matching the fourth matching field into a PPPoE data packet and sending it to the PPPoE client.

Optionally, in this embodiment of the present invention, the forwarding device may be specifically an OF switch, and the control device may be specifically an OF controller.

In this embodiment, the PPPoE control message sent by the PPPoE client is forwarded to the control device through the forwarding device, and the first information allocated by the control device is sent to the PPPoE client, so that the forwarding device can process the relevant messages of PPPoE. PPPoE is supported in scenarios where control and forwarding are separated, and PPPoE can be implemented on SDN devices.

FIG. 8 is a schematic flowchart of another embodiment of a PPPoE processing method according to the present invention. The PPPoE client in this embodiment is a customer premise equipment (Customer Premise Equipment, CPE). This example includes:

81: The OF controller sends the first flow table to the OF switch.

The matching field of the first flow table includes an Ethertype field, or an Ethertype field and a protocol field, and is used to indicate that the packet to be matched is a control packet during PPPoE negotiation, or a control packet during PPP protocol.

Specifically, the content added in the match field is used to indicate:

OFPXMT_OFB_ETH_TYPE is 0x8863; or,

OFPXMT_OFB_ETH_TYPE is 0x8864 and

OFPXMT_OFB_PPPOE_PPP_PROTO is 0xC021 or 0x8021.

Among them, the content in the match field can be in the form of Type Length Value (TLV). Taking OFPXMT_OFB_PPPOE_PPP_PROTO as 0xC021 as an example, it can be specifically expressed as: add the value corresponding to OFPXMT_OFB_PPPOE_PPP_PROTO in the T field (that is, 41, of course you can It is understood that other values can also be defined), and 0xC021 is added in the V field.

In addition, an action can be added in the instructions field: forward the message from the X interface, where the X interface is the interface connected to the OF controller.

Through the first flow table, the OF switch can forward the control message during PPPoE negotiation and the control message during PPP negotiation to the OF controller.

82: After receiving the PPPoE negotiation control packet sent by the CPE, the OF switch encapsulates the control packet into a first input packet (packet_in) and sends it to the OF controller.

83: The OF controller allocates a session ID, such as 1234, to the user and sends it to the CPE.

The OF controller may encapsulate the session ID in the first output packet (packet_out), and the OF switch outputs the first output packet to the CPE through a corresponding interface according to the interface from which the first input packet comes.

84: The OF switch receives the LCP message or the NCP message sent by the CPE, encapsulates the LCP message or the NCP message into a second input message (packet_in) and sends it to the controller.

85: The OF controller assigns an IP address, such as 100.1.1.2, to the user and sends it to the CPE.

The OF controller may encapsulate the IP address in the second output packet (packet_out), and the OF switch outputs the second output packet to the CPE through a corresponding interface according to the interface from which the second input packet comes.

Since the first flow table indicates to send the PPPoE control packet, including the control packet during PPPoE negotiation and the control packet during PPP negotiation, to the OF switch, the OF switch can complete the above-mentioned forwarding of the PPPoE control packet.

In addition, in the above process, the OF controller can be located in the same physical device as the PPPoE server, or the OF controller can support an external PPPoE server through an application programming interface (Application Programming Interface, API). At this time, the OF controller can act as PPPoE server, the packet sent from the PPPoE server to the PPPoE client can be sent by the OF controller to the OF switch through the packet_out packet of openflow, and then sent to the PPPoE client by the OF switch.

During the PPPoE negotiation process, the server and the client can learn each other's MAC address; and the PPPoE server will assign a session ID to the client, and the subsequent communication messages of both parties need to carry the session ID in the PPPoE message header.

In the LCP phase of PPPoE, the PPPoE server needs to complete operations such as user authentication, and in the NCP phase, PPPoE needs to assign an IP address to the server.

After completing the above operations, the PPPoE server can obtain the association relationship of the following information:

User's MAC address, user's IP address, user's session ID, etc.

After the above content, the PPPoE negotiation and PPP negotiation can be completed, and then the user can go online.

After the user goes online, the OF switch needs to complete the encapsulation or decapsulation of the data packet. At this time, the OF controller also needs to issue a flow table to the OF switch, which is used to instruct the OF switch to process the data packet. Wherein, the flow table indicating to process the data packet may be issued after completing PPPoE negotiation and PPP negotiation, or may be issued after receiving the first data packet.

Referring to Fig. 9, the flow table for instructing data packets to be processed is issued by the OF controller after completing PPPoE negotiation and PPP negotiation, including:

91: The CPE and the PPPoE server complete the user online authentication.

Among them, the specific content can refer to 81-85.

92: The OF controller sends the third flow table to the OF switch;

The matching field of the third flow table includes a session ID field and a protocol field, the value of the session ID field is a specified value, the protocol field indicates that the packet is an IP packet, and the command field indicates that the packet is to be decapsulated.

For example, the match field is:

OFPXMT_OFB_PPPOE_SESSION_ID is 1234, and

OFPXMT_OFB_PPPOE_PPP_PROTO is 0x0021

When expressing a specific TLV, it can include two TLV items. The value in the T field of one item is 40, the value in the V field is 1234, the value in the T field of the other item is 41, and the value in the V field is 0x0021 .

Instructions are:

OFPAT_POP_PPPOE_HEADER indicates that the action is decapsulation.

93: The OF controller sends the fourth flow table to the OF switch;

The matching field of the fourth flow table includes the destination IP address, and the destination IP address is a specified value, and the specified value is the IP address of the PPPoE client, and the instruction field indicates that the message is encapsulated.

For example, the match field is:

OFPXMT_OFB_IPV4_DST is 100.1.1.2

Instructions are:

OFPAT_PUSH_PPPOE_HEADER indicates that the action is encapsulation.

after,

94: The CPE sends the first data packet to the OF switch.

Or, referring to FIG. 10, the OF controller issues a flow table for instructing to process the data message after receiving the first data message, including:

101: The CPE and the PPPoE server complete the user login authentication.

Among them, the specific content can refer to 81-85.

102: The CPE sends the first data packet to the OF switch.

103: The OF switch sends the data packet to the OF controller.

104: The OF controller sends the third flow table to the OF switch.

For the specific content of the third flow table, refer to 92.

105: The OF controller sends the fourth flow table to the OF switch.

For the specific content of the fourth flow table, refer to 93.

The fourth flow table may be sent before the OF switch receives the first data message sent by the network side, or may be sent after receiving the first data message sent by the network side.

After the OF switch acquires the third flow table and the fourth flow table, it can process the data packet accordingly.

In addition, the above-mentioned first data message may be forwarded by the forwarding device to the control device according to the following principle: the forwarding device forwards the message that cannot be processed or the message of the set category according to the flow table to the control device , the packet that cannot be processed or the packet of the set type includes the first data packet.

Referring to Figure 11, the processing flow when the OF switch decapsulates the data message includes:

111: The OF switch receives the PPPoE packet sent by the CPE.

112: The OF switch judges whether the Ethernet type field of the message is 0x8864, and if so, executes 113, otherwise, executes 116.

113: The OF switch judges whether the session ID of the message is a specified value, if yes, execute 114, otherwise, execute 116.

Wherein, the specified value is allocated to the CPE by the OF controller during PPPoE negotiation, for example, 1234.

114: The OF switch judges whether the protocol field of the message is 0x0021, if so, executes 115, otherwise executes 116.

115: The OF switch decapsulates the PPPoE packet into an IPoE packet.

Referring to FIG. 12 , the PPPoE packet is decapsulated into an IPoE packet, and then the IPoE packet can be sent to the network side.

116: The OF switch discards the packet or processes it according to the protocol. Wherein, processing according to the protocol may refer to forwarding the packet to the OF controller.

The decapsulation operation in this embodiment can be completed according to multiple flow tables, or can be completed according to one flow table. For example, for a flow table, the match field of the flow table indicates that the items to be matched include: the Ethernet type field (OFPXMT_OFB_ETH_TYPE) is 0x8864, the session ID (Session_ID) is a specified value, and the protocol field (OFPXMT_OFB_PPPOE_PPP_PROTO) is 0x0021. When all items match, the unpacking operation is performed. For another example, when there are multiple flow tables, it may be: when the first flow table indicates that the Ethernet type field (OFPXMT_OFB_ETH_TYPE) is 0x8864, the operation performed is to process the second flow table, and the second flow table indicates When the session ID (Session_ID) is matched to the specified value, the operation performed is to process the third flow table. The third flow table indicates that the matched protocol field (OFPXMT_OFB_PPPOE_PPP_PROTO) is 0x0021, and the operation performed is decapsulation.

Referring to Figure 13, the processing flow when encapsulating data packets for the OF switch includes:

131: The OF switch receives the IPoE packet sent by the network side.

132: The OF switch judges whether the destination IP address of the message is a specified value, if yes, execute 133, otherwise, execute 134.

The specified value is the IP address assigned to the CPE by the OF controller after completing the PPP protocol, for example, 100.1.1.2.

133: The OF switch encapsulates the IPoE packet into a PPPoE packet.

Referring to FIG. 14, the IPoE packet is encapsulated into a PPPoE packet, and then the PPPoE packet can be sent to the CPE. The encapsulated session ID is determined by the corresponding relationship between the IP address and the session ID that can be obtained after the user's online authentication is completed.

134: The OF switch discards the packet or processes it according to the protocol. Wherein, processing according to the protocol may refer to forwarding the packet to the OF controller.

In this embodiment, by extending the existing flow table, the OF switch can realize the forwarding of the PPPoE control message, the decapsulation of the PPPoE data message, and the encapsulation of the IPoE data message.

FIG. 15 is a schematic flowchart of another embodiment of the PPPoE processing method of the present invention, and this embodiment is aimed at the keep-alive mechanism. The PPP protocol defines a keep-alive mechanism. In order to support this function, the PPPoE server periodically sends keep-alive packets between the server and the client. And when the link fails, the keep-alive needs to be terminated in time. See Figure 15, including:

151: The CPE and PPPoE complete the user online authentication.

Among them, the specific content can refer to 81-85.

152: The CPE communicates data packets with the OF switch normally.

For details, refer to FIG. 9 or FIG. 10 , and the processes shown in FIG. 11 and FIG. 13 .

153: Keep-alive packets are exchanged between the PPPoE server and the CPE.

154: When the link between the CPE and the PPPoE server fails, the OF controller sends a delete command to the OF switch, so as to delete the flow table corresponding to the CPE, and stop sending the keep-alive message.

Among them, the PPPoE server can determine whether the link is faulty according to the reception of the keep-alive message. For example, it detects the PPPoE message indicating that the user goes offline, or does not receive the PPPoE message after the set time, or does not receive the Set the number of PPPoE packets, etc. In addition, the session ID will be included in the interactive keep-alive message. If the PPPoE server finds that the message containing a certain session ID has not received a response, the PPPoE server can send the link failure notification corresponding to the session ID to the OF controller. A notification message, according to which the OF controller can include the session ID in the deletion instruction, so as to instruct the OF switch to delete the flow table associated with the session ID. The OF switch can pre-configure the association relationship between the session ID and the user information, and when receiving a delete command containing the session ID, it can delete all the flow tables of the user associated with the session ID.

In this embodiment, by deleting the corresponding flow table after a link failure, storage of invalid flow tables can be avoided, and storage efficiency can be improved.

Figure 16 is a schematic structural diagram of an embodiment of the forwarding device of the present invention, which may be specifically located in an OF switch or an OF switch, the device 160 includes a receiver 161 and a transmitter 162; the receiver 161 is used to receive the PPPoE control sent by the PPPoE client message; the transmitter 162 is used to send the PPPoE control message received by the receiver to the control device; the receiver 161 is also used to receive the first information sent by the control device, the first information The information required for sending the first PPPoE data message for the PPPoE client is distributed by the control device according to the PPPoE control message; A message is sent to the PPPoE client

Optionally, the transmitter is specifically used for:

sending the PPPoE control packet received by the receiver to the control device according to the received first flow table;

Send the first information to the PPPoE client according to the received second flow table.

The first flow table and the second flow table may be sent by the control device, or may be sent by other devices.

Optionally, the PPPoE control packet received by the receiver 161 includes a control packet applied to the PPPoE discovery phase, and the first information received by the receiver 161 includes a first session ID;

or,

The PPPoE control packet received by the receiver 161 includes a control packet applied to the PPPoE session phase, and the first information received by the receiver 161 includes a first IP address;

or,

The PPPoE control message received by the receiver 161 includes a control message applied to the PPPoE discovery phase and a control message applied to the PPPoE session phase, and the first information received by the receiver 161 includes the first session Identification ID and first IP address.

Optionally, referring to FIG. 17 , the device further includes: a processor 163 .

Optionally, the processor 163 is configured to encapsulate the PPPoE control packet received by the receiver 161 into an Open Flow OF packet before the sender sends the PPPoE control packet; the sender 162 It is specifically used to send the OF message to the control device. That is to say, the specific operation that the transmitter 162 sends the PPPoE control packet received by the receiver to the control device may be implemented by sending the OF packet to the control device.

Optionally, the receiver 161 is also configured to receive the first PPPoE data packet sent by the PPPoE client; the processor 163 is configured to: determine whether the session ID of the first PPPoE data packet is the the first session ID, and determine whether an IP packet is encapsulated in the first PPPoE data packet; and, the session ID in the first PPPoE data packet is the first session ID, and the first session ID When the IP message is encapsulated in a PPPoE data message, decapsulate the first PPPoE data message into a first public network data message according to the received third flow table; the transmitter 162 also It is used for: sending the first public network data message to the public network according to the third flow table.

Optionally, the receiver 161 is further configured to: receive a second public network data packet from the public network; the processor 163 is configured to: determine whether the destination address of the second public network data packet is the The first IP address; and, after determining that the destination address of the second public network data message is the first IP address, encapsulating the second public network data message according to the received fourth flow table is the second PPPoE data packet; the sender 162 is further configured to: send the second PPPoE data packet to the PPPoE client according to the fourth flow table.

Optionally, the receiver 161 is further configured to: receive a third flow table sent by the control device, the third flow table includes a third matching field and a third operation field, and the third matching field includes a session ID field and protocol field, and the value of the session ID field is the value of the first session ID, the value of the protocol field is a value indicating that the message is an IP message, and the operation of the third operation field includes Decapsulating the packet matching the third matching field into a public network data packet and sending it to the network side. In order to decapsulate the first PPPoE data packet into the first public network data packet.

It should be noted that the third flow table in this embodiment may have multiple implementation manners, and the third flow table in this embodiment is only one of the multiple implementation manners. In addition, the third flow table may be received from the control device, and may be received from other devices.

Optionally, the receiver 161 is further configured to: receive a fourth flow table sent by the control device, the fourth flow table includes a fourth matching field and a fourth operation field, and the fourth matching field includes a destination IP address field, and the value of the destination IP address field is the value of the first IP address, and the operation of the fourth operation domain includes encapsulating the packet matched with the fourth matching domain into a PPPoE data packet And send to the PPPoE client. In order to encapsulate the above-mentioned second public network data packet into a second PPPoE data packet.

It should be noted that the fourth flow table in this embodiment may have multiple implementation manners, and the fourth flow table in this embodiment is only one of the multiple implementation manners. In addition, the fourth flow table may be received from the control device, and may be received from other devices.

Optionally, the first public network data packet obtained by the processor 163 includes:

IP packets, IPoE packets, or IPoA packets.

Optionally, the second public network data packet includes: an IP packet, an IPoE packet or an IPoA packet.

Optionally, in terms of hardware implementation, the above receivers and transmitters may be collectively referred to as transceivers, and the above processors may be central processing units (CPUs), microprocessors, single-chip microcomputers, and the like.

Optionally, the forwarding device in this embodiment is the forwarding device described in the embodiment corresponding to any one of Figures 1 to 15

In this embodiment, the PPPoE control message sent by the PPPoE client is sent to the control device through the forwarding device, and the first information allocated by the control device is distributed to the PPPoE client, so that the forwarding device can process the relevant messages of PPPoE to realize Support PPPoE in the scenario where control and forwarding are separated, and then PPPoE can be implemented on SDN devices.

Figure 18 is a schematic structural diagram of another embodiment of the control device of the present invention, the control device may be located in the OF controller or just the OF controller, the device 180 includes a receiver 181, a processor 182 and a transmitter 183; the receiver 181 For receiving the PPPoE control message sent by the forwarding device; the processor 182 is used for distributing first information for the PPPoE client according to the PPPoE control message received by the receiver 181, and the first information is the PPPoE client The terminal sends the information required by the first PPPoE data packet; the sender 183 is configured to send the first information obtained by the processor 182 to the forwarding device.

Optionally, the PPPoE control packet received by the receiver 181 includes a control packet applied to the PPPoE discovery phase, and the first information obtained by the processor 182 includes a first session ID;

or,

The PPPoE control packet received by the receiver 181 includes a control packet applied to a PPPoE session phase, and the first information obtained by the processor 182 includes a first IP address;

or,

The PPPoE control message received by the receiver 181 includes a control message applied to the PPPoE discovery phase and a control message applied to the PPPoE session phase, and the first information obtained by the processor 182 includes a first session Identification ID and first IP address.

Optionally, the receiver 181 is specifically used for:

Receive the OF message sent by the forwarding device, where the OF message is obtained after the forwarding device encapsulates the PPPoE control message. That is to say, the PPPoE control packet received by the control device is encapsulated in the OF packet.

Optionally, the PPPoE control packet received by the receiver 181 is sent by the forwarding device according to the first flow table received from the control device. The first flow table may be received from other devices.

Optionally, the transmitter 183 is also used for:

Send a third flow table to the forwarding device, the third flow table includes a third matching field and a third operation field, the third matching field includes a session ID field and a protocol field, and the value of the session ID field is the value of the first session ID, the value of the protocol field is a value indicating that the packet is an IP packet, and the operation of the third operation field includes decapsulating the packet matching the third matching field It is a public network data packet and sent to the network side. In order to decapsulate the first PPPoE data packet into the first public network data packet.

It should be noted that the third flow table in this embodiment may have multiple implementation manners, and the third flow table in this embodiment is only one of the multiple implementation manners. In addition, the third flow table may be received from the control device, and may be received from other devices.

Optionally, the transmitter 183 is also used for:

Sending a fourth flow table to the forwarding device, the fourth flow table includes a fourth matching field and a fourth operation field, the fourth matching field includes a destination IP address field, and the value of the destination IP address field is The value of the first IP address, the operation of the fourth operation field includes encapsulating the packet matching the fourth matching field into a PPPoE data packet and sending it to the PPPoE client. In order to encapsulate the above-mentioned second public network data packet into a second PPPoE data packet.

It should be noted that the fourth flow table in this embodiment may have multiple implementation manners, and the fourth flow table in this embodiment is only one of the multiple implementation manners. In addition, the fourth flow table may be received from the control device, and may be received from other devices.

Optionally, in terms of hardware implementation, the receiver and the transmitter may be collectively referred to as a transceiver, and the processor may be a central processing unit (CPU), a microprocessor, a single-chip microcomputer, and the like.

Optionally, the control device in this embodiment may be the control device described in the embodiment corresponding to any one of FIGS. 1 to 15 .

In this embodiment, the PPPoE control message sent by the PPPoE client is sent to the control device through the forwarding device, and the first information allocated by the control device is distributed to the PPPoE client, so that the forwarding device can process the relevant messages of PPPoE to realize Support PPPoE in the scenario where control and forwarding are separated, and then PPPoE can be implemented on SDN devices.

Figure 19 is a schematic structural diagram of an embodiment of the PPPoE processing system of the present invention, the system 190 includes a forwarding device 191 and a control device 192; wherein, the forwarding device may be as shown in Figure 16 or Figure 17 or may be the same as that shown in Figures 1 to 17 The forwarding device and the control device described in any corresponding embodiment may be as shown in FIG. 18 or may be the control device corresponding to any one of FIGS. 1 to 15 or described in the embodiment corresponding to FIG. 18 .

In this embodiment, the PPPoE control message sent by the PPPoE client is sent to the control device through the forwarding device, and the first information allocated by the control device is distributed to the PPPoE client, so that the forwarding device can process the relevant messages of PPPoE to realize Support PPPoE in the scenario where control and forwarding are separated, and then PPPoE can be implemented on SDN devices.

Those skilled in the art can clearly understand that for the convenience and brevity of description, only the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to needs. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the above-described system, device, and unit, reference may be made to the corresponding process in the foregoing method embodiments, and details are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be Incorporation may either be integrated into another system, or some features may be omitted, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, and other media that can store program codes. .

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the application.

Claims (17)

1. A processing method based on Ethernet-based point-to-point protocol PPPoE, characterized in that, comprising: The forwarding device receives the PPPoE control packet sent by the PPPoE client; The forwarding device sends the PPPoE control packet to the control device; The forwarding device receives the first information sent by the control device, the first information is the information required by the PPPoE client to send the first PPPoE data message, and the control device sends the first PPPoE data message according to the PPPoE control message distribute; The forwarding device sends the first information to the PPPoE client; Wherein, the described sending the PPPoE control message to the control device specifically includes: Encapsulating the PPPoE control message into an open flow OF message; Send the OF message to the control device. 2. The method of claim 1, wherein, The forwarding device sends the PPPoE control packet to the control device according to the received first flow table; The forwarding device sends the first information to the PPPoE client according to the received second flow table. 3. The method according to claim 1 or 2, characterized in that, The PPPoE control message includes a control message applied to the PPPoE discovery phase, and the first information includes a first session identification ID; or, The PPPoE control message includes a control message applied to the PPPoE session phase, and the first information includes a first IP address; or, The PPPoE control message includes a control message used in a PPPoE discovery phase and a control message used in a PPPoE session phase, and the first information includes a first session ID and a first IP address. 4. The method according to claim 3, characterized in that, after sending the first information to the PPPoE client, the method further comprises: The forwarding device receives the first PPPoE data packet sent by the PPPoE client; The forwarding device determines whether the session ID of the first PPPoE data message is the first session ID, and determines whether an IP message is encapsulated in the first PPPoE data message; When the session ID of the first PPPoE data packet is the first session ID and the IP packet is encapsulated in the first PPPoE data packet, the forwarding device, according to the received third flow Table, decapsulating the first PPPoE data message into a first public network data message; The forwarding device sends the first public network data packet to the public network according to the third flow table. 5. The method according to claim 3, characterized in that, after sending the first information to the PPPoE client, the method further comprises: The forwarding device receives the second public network data message from the public network; The forwarding device determines whether the destination address of the second public network data packet is the first IP address; After the forwarding device determines that the destination address of the second public network data message is the first IP address, according to the received fourth flow table, the second public network data message is encapsulated into a second PPPoE data packet; The forwarding device sends the second PPPoE data packet to the PPPoE client according to the fourth flow table. 6. The method according to claim 4, wherein the first public network data message comprises: An Internet Protocol IP packet, an Ethernet-based Internet Protocol IPoE packet, or an Asynchronous Transfer Mode-based Internet Protocol IPoA packet. 7. A processing method based on Ethernet-based point-to-point protocol PPPoE, characterized in that, comprising: The control device receives the PPPoE control packet sent by the forwarding device; The control device allocates first information to the PPPoE client according to the PPPoE control message, and the first information is the information required for the PPPoE client to send the first PPPoE data message; The control device sends the first information to the forwarding device; Wherein, the PPPoE control message sent by the receiving and forwarding device includes: receiving an OpenFlow OF packet sent by the forwarding device, where the OF packet is obtained after the forwarding device encapsulates the PPPoE control packet. 8. The method of claim 7, wherein, The PPPoE control message includes a control message applied to the PPPoE discovery phase, and the first information includes a first session identification ID; or, The PPPoE control message includes a control message applied to the PPPoE session phase, and the first information includes a first IP address; or, The PPPoE control message includes a control message used in a PPPoE discovery phase and a control message used in a PPPoE session phase, and the first information includes a first session ID and a first IP address. 9. A forwarding device, characterized in that, comprising: The receiver is used to receive the PPPoE control message sent by the PPPoE client; a transmitter, configured to send the PPPoE control packet received by the receiver to a control device; The receiver is also used to: receive the first information sent by the control device, the first information is the information required by the PPPoE client to send the first PPPoE data message, and the control device according to the PPPoE control packet distribution; The transmitter is further configured to: send the first information received by the receiver to the PPPoE client; Also includes: processor; The processor is configured to, before the sender sends the PPPoE control message, encapsulate the PPPoE control message received by the receiver into an OpenFlow OF message. 10. The device according to claim 9, wherein the transmitter is specifically used for: sending the PPPoE control packet received by the receiver to the control device according to the received first flow table; Send the first information to the PPPoE client according to the received second flow table. 11. Apparatus according to claim 9 or 10, characterized in that The PPPoE control message received by the receiver includes a control message applied to the PPPoE discovery phase, and the first information received by the receiver includes a first session ID; or, The PPPoE control packet received by the receiver includes a control packet applied to the PPPoE session phase, and the first information received by the receiver includes a first IP address; or, The PPPoE control message received by the receiver includes a control message applied to the PPPoE discovery phase and a control message applied to the PPPoE session phase, and the first information received by the receiver includes a first session identification ID and the first IP address; The sender is specifically configured to send the OF packet to the control device. 12. The apparatus of claim 11 wherein, The receiver is also used to receive the first PPPoE data packet sent by the PPPoE client; The processor is configured to: determine whether the session ID of the first PPPoE data message is the first session ID, and determine whether an IP message is encapsulated in the first PPPoE data message; and, in the The session ID of the first PPPoE data packet is the first session ID, and when the IP packet is encapsulated in the first PPPoE data packet, according to the received third flow table, the first PPPoE The data packet is decapsulated into a first public network data packet; The sender is further configured to: send the first public network data packet to the public network according to the third flow table. 13. The apparatus of claim 11, wherein: The receiver is further configured to: receive a second public network data message from the public network; The processor is configured to: determine whether the destination address of the second public network data packet is the first IP address; and determine whether the destination address of the second public network data packet is the first IP address; After the IP address, the second public network data packet is encapsulated into a second PPPoE data packet according to the received fourth flow table; The sender is further configured to: send the second PPPoE data packet to the PPPoE client according to the fourth flow table. 14. The device according to claim 12, wherein the first public network data message obtained by the processor comprises: An Internet Protocol IP packet, an Ethernet-based Internet Protocol IPoE packet, or an Asynchronous Transfer Mode-based Internet Protocol IPoA packet. 15. A control device, characterized in that it comprises: The receiver is used to receive the PPPoE control message sent by the forwarding device; A processor, configured to assign first information to the PPPoE client according to the PPPoE control packet received by the receiver, where the first information is information required by the PPPoE client to send a first PPPoE data packet; a sender, configured to send the first information obtained by the processor to the forwarding device; Wherein, the receiver is specifically used for: receiving an OpenFlow OF packet sent by the forwarding device, where the OF packet is obtained after the forwarding device encapsulates the PPPoE control packet. 16. The apparatus of claim 15, wherein: The PPPoE control message received by the receiver includes a control message applied to a PPPoE discovery phase, and the first information obtained by the processor includes a first session ID; or, The PPPoE control message received by the receiver includes a control message applied to the PPPoE session phase, and the first information obtained by the processor includes a first IP address; or, The PPPoE control message received by the receiver includes a control message applied to the PPPoE discovery phase and a control message applied to the PPPoE session phase, and the first information obtained by the processor includes a first session identification ID and the first IP address. 17. A processing system based on Ethernet-based point-to-point protocol PPPoE, characterized in that, comprising: The forwarding device according to any one of claims 9 to 14; and, A control device as claimed in claim 15 or 16.