CN106302860B - SDN-based free address resolution protocol sending method, device and system - Google Patents
SDN-based free address resolution protocol sending method, device and system Download PDFInfo
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- CN106302860B CN106302860B CN201610826353.6A CN201610826353A CN106302860B CN 106302860 B CN106302860 B CN 106302860B CN 201610826353 A CN201610826353 A CN 201610826353A CN 106302860 B CN106302860 B CN 106302860B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5046—Resolving address allocation conflicts; Testing of addresses
Abstract
The invention provides a method, a device and a system for sending a free address resolution protocol based on an SDN (software defined network), wherein the method comprises the following steps: the method comprises the steps that a controller receives an Experimenter message of a private extension sent by a switch in an SDN, wherein the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch; receiving a message of an unmatched flow table reported by a switch in an SDN, wherein the message of the unmatched flow table comprises an entrance switch ID and a switch port; generating a free address resolution protocol corresponding relation table according to an inlet switch ID and a switch port in a message which is not matched with a flow table and an interface IP address, an interface MAC address, the switch ID and the switch port in an Experimenter message; and sending a free address resolution protocol message to the corresponding switch according to the free address resolution protocol corresponding relation table. The invention can automatically adapt to the change under the condition that the network topology changes, and does not need to be reconfigured.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method, a device and a system for sending a Gratuitous address resolution protocol (Gratuitous ARP) based on an SDN.
Background
Arp (address Resolution Protocol) is mainly used to detect IP (Internet Protocol) address conflicts. When one host sends free ARP request message, if ARP response message is received, it shows that there is host using IP in network. When the device is restarted or the proxy ARP function is started, a gratuitous ARP is actively sent to the local network to detect whether the IP addresses conflict. The free ARP is that the source IP and the target IP are both self, the source MAC (media Access Control) is also self, the target MAC is broadcast, namely, the MAC address of the self is requested to the network where the self is positioned, when other hosts in the network use the same IP address as the self, the host sends an ARP reply to the host, at the moment, if the host sending the free ARP receives the reply, the IP address used by the host is proved to have conflict, and if the reply is not received, the IP address conflict does not exist.
As shown in fig. 1, the conventional gratuitous ARP technique may enable a gratuitous ARP function to be sent on an interface of a gateway at a fixed time. After the function is enabled, the gateway interface periodically sends a free ARP message of the interface main IP address according to the configured time interval. In this way, each host can learn the correct gateway and thus access the network normally.
However, if the attacker spoofs the gateway to send the gratuitous ARP message, other hosts in the same network segment can be deceived, so that the flow of the deceived host accessing the gateway is redirected to an incorrect MAC address, and users of other hosts cannot normally access the network.
In an actual environment, when a network load is large or a CPU occupancy rate of a receiving end host is high, there may be a phenomenon that an ARP packet is discarded or the host cannot process the received ARP packet in time. In this case, the dynamic ARP entry of the receiver host may age due to timeout, and the traffic between the two may be interrupted before it learns the ARP entry of the sender device again.
In addition, the traditional gratuitous ARP sending is only for a certain switching device, the configuration is distributed, and if the network topology is complex, the configuration is very complicated. If the network topology changes, reconfiguration is required.
Disclosure of Invention
In view of the foregoing problems, an object of embodiments of the present invention is to provide a method, an apparatus, and a system for gratuitous ARP sending based on SDN, which can automatically adapt to changes without reconfiguration when a network topology changes.
In order to achieve the above object, an embodiment of the present invention provides a method for sending a free address resolution protocol based on an SDN, including: the method comprises the steps that a controller receives an Experimenter message of a private extension sent by a switch in an SDN, wherein the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch; the method comprises the steps that a controller receives a message of an unmatched flow table reported by a switch in an SDN, wherein the message of the unmatched flow table comprises an entrance switch ID and a switch port; the controller generates a free address resolution protocol corresponding relation table according to an inlet switch ID and a switch port in the message of the unmatched flow table and an interface IP address, an interface MAC address, a switch ID and a switch port in the Experimenter message; and the controller sends a free address resolution protocol message to the corresponding switch according to the free address resolution protocol corresponding relation table.
Further, the method further comprises: the controller presets SDN-based free ARP options to configure the SDN-based free ARP functions to be turned on or off.
Further, the method further comprises: the controller presets the interval time for sending the free address resolution protocol; the free address resolution protocol correspondence table includes: switch ID, switch port, IP address, MAC address, and interval time.
Further, the controller receives a packet of an unmatched flow table reported by a switch in the SDN, where the packet of the unmatched flow table includes an ingress switch ID and a switch port, and includes: inquiring a flow table after a message enters an SDN, and forwarding the message matched with the flow table according to a forwarding path in the flow table; reporting the message which is not matched with the flow table to a controller; the controller receives messages of unmatched flow tables reported by the switch, and acquires an entrance switch ID and a switch port which need to send a free address resolution protocol from the messages of the unmatched flow tables.
Further, the controller sends a free address resolution protocol message to the corresponding switch according to the free address resolution protocol correspondence table, including: and under the condition that the SDN-based free address resolution protocol function is opened, the controller sends a free address resolution protocol message to a corresponding switch according to the switch ID and the switch port in the free address resolution protocol corresponding relation table and the interval time.
In order to achieve the above object, an embodiment of the present invention further provides a system for sending a free address resolution protocol based on an SDN, including: a controller and a switch, wherein,
the switch is used for sending a proprietary extended Experimenter message to the controller, wherein the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch; reporting a message of an unmatched flow table to a controller, wherein the message of the unmatched flow table comprises an entrance switch ID and a switch port; the controller is used for receiving a private extended Experimenter message sent by a switch in the SDN and a message which is reported by the switch and is not matched with a flow table; generating a free address resolution protocol corresponding relation table according to an inlet switch ID and a switch port in the message of the unmatched flow table and an interface IP address, an interface MAC address, a switch ID and a switch port in the Experimenter message; and sending a free address resolution protocol message to a corresponding switch according to the free address resolution protocol corresponding relation table.
In order to achieve the above object, an embodiment of the present invention further provides a controller for free address resolution protocol transmission based on SDN, including: the first processing module is used for receiving an Experimenter message of private extension sent by a switch in an SDN and a message which is reported by the switch and is not matched with a flow table; a second processing module, configured to generate a free address resolution protocol correspondence table according to the ingress switch ID and the switch port in the message of the unmatched flow table, and the interface IP address, the interface MAC address, the switch ID, and the switch port in the Experimenter message; and the third processing module is used for sending a free address resolution protocol message to the corresponding switch according to the free address resolution protocol corresponding relation table.
As can be seen from the above, according to the method, the device and the system for sending the gratuitous ARP based on the SDN, provided by the embodiments of the present invention, based on the SDN architecture, the controller calculates the location of the gateway according to the network topology, and enables the gratuitous ARP sending function to be sent at regular time on the interface of the gateway, and if the network topology changes, the change is automatically adapted without reconfiguration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of networking for gratuitous ARP transmission provided in the prior art;
fig. 2 is a schematic flowchart of a method for gratuitous ARP sending based on SDN according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an extended Experimenter message format according to an embodiment of the present invention;
fig. 4 is a schematic diagram of system networking for gratuitous ARP sending based on SDN according to an embodiment of the present invention;
fig. 5 is a functional block diagram of a controller for gratuitous ARP sending based on SDN according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a method for transmitting a free ARP based on an SDN. Referring to fig. 2, the method may include the following steps:
step S1: the controller presets a gratuitous ARP option and a gratuitous ARP corresponding relation option based on the SDN.
In the present embodiment, gratuitous ARP options based on SDN are set in advance, as shown in table 1.
TABLE 1
| Configuration item | Means of |
| SDN-based toll-free ARP function | Turning on or off SDN-based gratuitous ARP workCan be used for |
In the present embodiment, a gratuitous ARP correspondence table based on SDN is also set in advance, as shown in table 2.
TABLE 2
Step S2: the method comprises the steps that a controller receives an Experimenter message of a private extension sent by a switch in an SDN, wherein the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch.
In this step, a switch in the SDN first establishes a channel with a controller, and needs to initialize an OpenFlow channel, and then the switch reports its own IP address and MAC address through a privately extended Experimenter message.
Compared with the prior art, the embodiment of the invention expands the private Experimenter message, the format of the expanded Experimenter message is shown in figure 3, and the expert with the value of 255 needs to apply to the ONF organization; an Experimenter type value of 1 indicates going from the switch to the controller, and an Experimenter type value of 2 indicates going from the controller to the switch. In addition, in the private extended Experimenter message in the embodiment of the present invention, an interface IP address, an interface MAC address, a switch ID, and a switch port are added.
Step S3: the controller receives a message of an unmatched flow table reported by a switch in the SDN, and acquires an entrance switch ID and a switch port from the message of the unmatched flow table.
In the step, after the message enters the SDN, a flow table is inquired, and the message matched with the flow table is forwarded according to a forwarding path in the flow table; and reporting the message which is not matched with the flow table to the controller.
And the controller receives a message which is reported by the switch and is not matched with the flow table, and acquires the ID of the inlet switch and the port of the switch from the message.
Step S4: and the controller generates a free ARP corresponding relation table according to the inlet switch ID and the switch port in the message of the unmatched flow table and the interface IP address, the interface MAC address, the switch ID and the switch port in the Experimenter message.
In this step, the identifier message received by the controller in step S2 includes an interface IP address, an interface MAC address, a switch ID, and a switch port; in step S2, the controller receives a message of an unmatched flow table, which includes an ingress switch ID and a switch port, that is, a switch and a port that need to send a gratuitous ARP. And the controller generates a free ARP corresponding relation table according to the inlet switch ID and the switch port in the message of the unmatched flow table and the interface IP address, the interface MAC address, the switch ID and the switch port in the Experimenter message.
The controller also presets interval time for sending the gratuitous ARP to be added into the gratuitous ARP corresponding relation table, so that the gratuitous ARP corresponding relation table comprises a switch ID, a switch port, an IP address, an MAC address and interval time, wherein the switch ID indicates the ID of a switch in the SDN, the switch port indicates the port of the switch in the SDN, the IP address indicates an interface IP address of a gateway, the MAC address indicates the interface MAC address of the gateway, and the interval time is the interval time for sending the gratuitous ARP.
Step S5: and the controller sends a free ARP message to the corresponding switch according to the free ARP corresponding relation table.
In this step, the controller calculates an SDN network topology according to an LLDP (Link Layer Discovery Protocol) according to the received Experimenter packet and the packet that does not match the flow table, and enables a free ARP function to be sent on an interface of the gateway.
And under the condition that a free ARP function based on the SDN is opened, the controller issues and sends free ARP messages to corresponding exchangers according to the exchanger ID and the exchanger port in the free ARP corresponding relation table and interval time.
Fig. 4 is a schematic diagram of system networking for gratuitous ARP sending based on SDN according to an embodiment of the present invention. As shown in fig. 4, the system includes: controllers and switches S0, S1, S2, S3.
Wherein the content of the first and second substances,
the system comprises a switch and a controller, wherein the switch is used for sending a proprietary extended Experimenter message to the controller, and the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch; reporting a message of an unmatched flow table to a controller, wherein the message of the unmatched flow table comprises an entrance switch ID and a switch port;
the controller is used for acquiring an interface IP address, an interface MAC address, an exchanger ID and an exchanger port of the exchanger when the Experimenter message is received; when receiving the message of the unmatched flow table, acquiring an entrance switch ID and a switch port; generating a free ARP corresponding relation table according to an inlet switch ID and a switch port in the message of the unmatched flow table and an interface IP address, an interface MAC address, a switch ID and a switch port in the Experimenter message; and sending a free ARP message to the corresponding switch according to the free ARP corresponding relation table.
The specific technical details of the SDN-based gratuitous ARP sending system and the SDN-based gratuitous ARP sending method are similar, and therefore, detailed descriptions thereof are omitted.
In an embodiment of the present invention, the switches S0, S1, S2, and S3 respectively send proprietary extended Experimenter messages to the controller. When the message enters the SDN, a flow table is queried, and an ingress switch of the message that does not match the flow table, for example, the switch ID and the switch port of S1, is reported to the controller, that is, the switch and the port that need to send the gratuitous ARP. The controller generates a free ARP corresponding relation table according to the switch and the port which need to send the free ARP, the interface IP address, the interface MAC address, the switch ID and the switch port of the switch in the SDN which are obtained in advance; according to the gratuitous ARP correspondence table, the switch S1 sends gratuitous ARP messages, and the switch S1 sends gratuitous ARP messages to the host A.
If the network topology changes, the host A migrates to communicate with the switch S3, when the message enters the SDN, the flow table is inquired, and the entry switch of the message which is not matched with the flow table, namely the switch ID and the switch port of S3, is reported to the controller. The controller generates a free ARP corresponding relation table according to the switch and the port which need to send the free ARP, the interface IP address, the interface MAC address, the switch ID and the switch port of the switch in the SDN which are obtained in advance; according to the gratuitous ARP correspondence table, a gratuitous ARP message is sent to the corresponding switch S3, the switch S3 sends a gratuitous ARP message to the host A, and S1 stops sending the gratuitous ARP message.
Please refer to fig. 5. An embodiment of the present invention further provides a controller for gratuitous ARP based on SDN, including:
the first processing module is used for receiving an Experimenter message of private extension sent by a switch in an SDN and a message which is reported by the switch and is not matched with a flow table;
a second processing module, configured to generate a free address resolution protocol correspondence table according to the ingress switch ID and the switch port in the message of the unmatched flow table, and the interface IP address, the interface MAC address, the switch ID, and the switch port in the Experimenter message;
and the third processing module is used for sending a free address resolution protocol message to the corresponding switch according to the free address resolution protocol corresponding relation table.
In addition, the controller further comprises a setting module for setting the SDN-based toll-free address resolution protocol option to configure the opening or closing of the SDN-based toll-free address resolution protocol function. The setting module is further configured to set an interval time for sending a free address resolution protocol and add the interval time to the free address resolution protocol correspondence table, where the free address resolution protocol correspondence table includes a switch ID, a switch port, an IP address, an MAC address, and the interval time.
The specific technical details of the controller for sending the gratuitous ARP based on the SDN are similar to those of the method for sending the gratuitous ARP based on the SDN, and therefore, detailed descriptions thereof are omitted.
As can be seen from the above, in the method, the device and the system for sending the gratuitous ARP based on the SDN according to the embodiments of the present invention, based on the SDN architecture, the controller calculates the location of the gateway according to the network topology, and enables the function of sending the gratuitous ARP at regular time on the interface of the gateway, and if the network topology changes, the change is automatically adapted without reconfiguration.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.
Finally, it should be noted that: the foregoing description of various embodiments of the invention is provided to those skilled in the art for the purpose of illustration. It is not intended to be exhaustive or to limit the invention to a single disclosed embodiment. Various alternatives and modifications of the invention, as described above, will be apparent to those skilled in the art. Thus, while some alternative embodiments have been discussed in detail, other embodiments will be apparent or relatively easy to derive by those of ordinary skill in the art. The present invention is intended to embrace all such alternatives, modifications, and variances which have been discussed herein, and other embodiments which fall within the spirit and scope of the above application.
Claims (4)
1. A SDN-based free address resolution protocol sending method is characterized by comprising the following steps:
the controller presets a free address resolution protocol option based on the SDN so as to configure the opening or closing of the free address resolution protocol function based on the SDN;
the method comprises the steps that a controller receives an Experimenter message of a private extension sent by a switch in an SDN, wherein the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch;
the method comprises the steps that a controller receives a message of an unmatched flow table reported by a switch in an SDN, wherein the message of the unmatched flow table comprises an entrance switch ID and a switch port;
the controller generates a free address resolution protocol corresponding relation table according to an inlet switch ID and a switch port in the message of the unmatched flow table and an interface IP address, an interface MAC address, a switch ID and a switch port in the Experimenter message;
the controller presets the interval time for sending the free address resolution protocol, and the free address resolution protocol corresponding relation table comprises: switch ID, switch port, IP address, MAC address and interval time,
and under the condition that the SDN-based free address resolution protocol function is opened, the controller sends a free address resolution protocol message to a corresponding switch according to the switch ID and the switch port in the free address resolution protocol corresponding relation table and the interval time.
2. The SDN-based lib sending method according to claim 1, wherein the receiving, by the controller, a packet of an unmatched flow table reported by a switch in the SDN, where the packet of the unmatched flow table includes an ingress switch ID and a switch port, includes:
inquiring a flow table after a message enters an SDN, and forwarding the message matched with the flow table according to a forwarding path in the flow table; reporting the message which is not matched with the flow table to a controller;
the controller receives messages of unmatched flow tables reported by the switch, and acquires an entrance switch ID and a switch port which need to send a free address resolution protocol from the messages of the unmatched flow tables.
3. A system for free address resolution protocol (arp) delivery based on SDN, comprising: a controller and a switch, wherein,
the switch is used for sending a proprietary extended Experimenter message to the controller, wherein the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch; reporting a message of an unmatched flow table to a controller, wherein the message of the unmatched flow table comprises an entrance switch ID and a switch port;
the controller is used for presetting a free address resolution protocol option based on the SDN, configuring the opening or closing of the free address resolution protocol function based on the SDN, and receiving a privately-extended Experimenter message sent by a switch in the SDN and a message reported by the switch and not matched with a flow table; generating a free address resolution protocol corresponding relation table according to an inlet switch ID and a switch port in the message of the unmatched flow table and an interface IP address, an interface MAC address, a switch ID and a switch port in the Experimenter message; presetting the interval time for sending the free address resolution protocol, wherein the free address resolution protocol corresponding relation table comprises: the controller sends a free address resolution protocol message to a corresponding switch according to the interval time according to the switch ID and the switch port in the free address resolution protocol correspondence table under the condition that the free address resolution protocol function based on the SDN is opened according to the switch ID, the switch port, the IP address, the MAC address and the interval time.
4. A SDN-based toll-free address resolution protocol (arp) sending controller, comprising:
the first processing module is used for receiving an Experimenter message of private extension sent by a switch in an SDN and a message of an unmatched flow table reported by the switch, wherein the Experimenter message comprises an interface IP address, an interface MAC address, a switch ID and a switch port of the switch;
the second processing module is used for generating a free address resolution protocol corresponding relation table according to an inlet switch ID and a switch port in the message of the unmatched flow table and an interface IP address, an interface MAC address, a switch ID and a switch port in the Experimenter message;
the system comprises a setting module, a free address resolution protocol sending module and a free address resolution protocol sending module, wherein the setting module is used for setting a free address resolution protocol option based on an SDN (software defined network) so as to configure the opening or closing of a free address resolution protocol function based on the SDN, and is also used for setting an interval time for sending a free address resolution protocol and adding the interval time into a free address resolution protocol corresponding relation table, and the free address resolution protocol corresponding relation table comprises a switch ID, a switch port, an IP (Internet protocol) address, an MAC (media;
and the third processing module is used for sending a free address resolution protocol message to a corresponding switch according to the interval time according to the switch ID and the switch port in the free address resolution protocol corresponding relation table under the condition that the free address resolution protocol function based on the SDN is opened according to the free address resolution protocol corresponding relation table.
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