CN106254407A - The method and device that a kind of home network service is shared - Google Patents

Abstract

The invention discloses the method and device that a kind of home network service is shared, described method includes: the home router in home network receives the multicast searching request for the service of searching for that its lower UPNP service equipment hung is initiated；Described home router is by acting on behalf of described multicast searching request, and in each VLAN at its place, search services；Service search response to the UPNP service equipment initiating described multicast searching request.The present invention utilizes UPNP technology, is realized service search and the control of whole home network between home router by multicast message.

Description

Method and device for home network service sharing

technical field

The present invention relates to the fields of Universal Plug and Play (UPNP) and home routers, in particular to a method and device for home network service sharing.

Background technique

At present, home routers not only provide users with basic network functions, such as Network Address Translation (Network Address Translation, NAT) and flow control, but also generally have their own UPNP function, which users can choose to enable or disable to determine whether to enable UPNP function . By applying the UPNP function, all UPNP-enabled services can be found in the home LAN, including printers, media players, and remote control of smart home appliances.

In the UPNP protocol suite, the Simple Service Discovery Protocol (SSDP) is used for service discovery, and multicast is used for service search. In home routers, multicast forwarding does not support L3 forwarding (that is, copy the data of the multicast source through the IP address, and then forward it to each multicast interface), but supports L2 forwarding (that is, for the interface that receives multicast data For other multicast interfaces in the same virtual local area network (Virtual Local Area Network, VLAN), the chip controls the direct copying and forwarding of the multicast data, and does not hand it over to the central processing unit (Central Processing Unit, CPU) of the router for processing). That is to say, on the home router device, UPNP service lookup can only be performed in the same VLAN.

Therefore, if the home router is divided into multiple VLANs, or there are multi-level routers connected in series, then using UPNP will not be able to find and control all UPNP service devices in the entire home network.

Contents of the invention

The purpose of the present invention is to provide a method and device for home network service sharing, which can better solve the problem of finding and controlling all UPNP devices in the home network.

According to one aspect of the present invention, a method for sharing a home network service is provided, including:

The home router in the home network receives the multicast search request for searching services initiated by the UPNP service device attached to it;

The home router searches for services in each virtual local area network where it is located by proxying the multicast search request;

Respond the searched service to the UPNP service device that initiated the multicast search request.

Preferably, the step of searching for services in each virtual local area network where the home router is located by proxying the multicast search request includes:

The home router judges whether its interface is in the same virtual local area network as the incoming interface of the multicast search message;

If the interface of the home router and the incoming interface of the multicast search message are in the same virtual local area network, the multicast search message is forwarded to other UPNP devices under the virtual local area network via the interface;

If the interface of the home router is not in the same virtual local area network as the incoming interface of the multicast search message, then forward the multicast search request to the virtual local area network where the interface is located according to the configuration attributes of the virtual local area network where the interface is located. local area network.

Preferably, if the configuration attribute is an attribute used to connect to a home network, the intranet address as the source address of the multicast search request is modified to an external network address, and then forwarded to the virtual local area network where the interface is located.

Preferably, the step of responding the searched service to the UPNP service device that initiated the multicast search request includes:

Receive a unicast response message including a device address and a service type sent by other UPNP service devices in response to the multicast search request in a unicast manner, and the unicast response message includes service type information and the UPNP service device that provides the service address information;

Send the unicast response message to the UPNP service device that initiated the multicast search request.

Preferably, if the interface used to receive the unicast response message is not in the same virtual local area network as the incoming interface of the multicast search request, the external network address as the destination address of the unicast response message is modified After it is an intranet address, it is forwarded to the UPNP service device that initiated the multicast search request.

According to another aspect of the present invention, a device for sharing home network services is provided, including:

The request acquisition module is used to receive a multicast search request for searching services initiated by a UPNP service device under the home router in the home network;

A service search module, configured to search for services in each virtual local area network where the home router is located by proxying the multicast search request;

The request response module is configured to respond the searched service to the UPNP service device that initiated the multicast search request.

Preferably, the service search module judges whether its interface is in the same virtual local area network as the incoming interface of the multicast search message, if the interface of the home router and the incoming interface of the multicast search message are in the same virtual local area network , the multicast search message is forwarded to other UPNP devices under the virtual local area network via the interface, otherwise, the multicast search request is forwarded to the virtual local area network.

Preferably, if the configuration attribute is an attribute used to connect to a home network, the service search module modifies the internal network address as the source address of the multicast search request to an external network address, and then forwards it to the interface The virtual local area network in which it is located.

Preferably, the request response module receives a unicast response message including a device address and a service type sent by other UPNP service devices in response to the multicast search request in a unicast manner, and sends the unicast response message to To the UPNP service device that initiates the multicast search request, wherein the unicast response message includes service type information and address information of the UPNP service device that provides the service.

Preferably, if the interface used to receive the unicast response message is not in the same virtual local area network as the incoming interface of the multicast search request, the request response module uses the unicast response message as the destination address After the external network address of the user is modified to an internal network address, it is forwarded to the UPNP service device that initiated the multicast search request.

Compared with the prior art, the beneficial effects of the present invention are:

The invention utilizes the UPNP technology to realize the service search and control of the entire home network through multicast search requests (that is, multicast messages) between home routers.

Description of drawings

FIG. 1 is a schematic diagram of a home router provided by an embodiment of the present invention;

FIG. 2 is a block diagram of a method for home network service sharing provided by an embodiment of the present invention;

FIG. 3 is a block diagram of a home network service sharing device provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of home network networking provided by an embodiment of the present invention;

FIG. 5 is a flow chart of home network service sharing based on the networking diagram shown in FIG. 4 .

detailed description

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

The present invention realizes home network service sharing based on UPNP technology, which includes home router, UPNP protocol family and NAT conversion, wherein:

A home router is a router used in a home network to access the public network. All router devices connected to each other in the home network (ie, home routers) generally refer to low-end router devices, excluding switch devices. Figure 1 is a schematic diagram of a home router provided by an embodiment of the present invention. As shown in Figure 1, the home router is a single-arm router on which NAT conversion is performed, that is to say, NAT conversion on a home router is generally applied to a single-arm router , which divides two different VLANs, that is, a wide area network (Wide Area Network, WAN) and a local area network (Local Area Network, LAN). Different devices are connected to the LAN area, and each device is assigned an internal network address (that is, an internal network IP address). When a device in the LAN area accesses external network services, NAT conversion is performed on the home router to convert it into a WAN interface address (that is, an external network IP address). network address, external network IP address).

The UPNP protocol family is mainly used to realize the intelligent interconnection and intercommunication of devices, so that offices, homes and other public places can conveniently build a network environment in which devices are interconnected. UPNP is a structure that realizes the end-to-end network connection of smart devices. Based on technology, the distributed and open network structure enables the transfer of control data between networked devices. UPNP technology supports the communication among control points, devices and services, and the devices and related services are also defined and published using Extensible Markup Language (XML). By using UPNP, a device can dynamically join the network, automatically obtain an IP address, announce its capabilities to other devices or know the existence and services of other devices, all these processes are automatically completed, and then the devices can communicate directly with each other.

The working process of the UPNP is divided into 6 steps:

(1) Addressing

The device obtains an IP address, and the IP address is obtained through a Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, DHCP) or manual configuration or Auto-IP.

(2) Discovery

When a device is added to the network, the UPNP discovery protocol allows the device to notify (advise) the services it owns to other control points (Control Point, CP) on the network. Similarly, when a CP is added to the network, the UPNP discovery protocol allows the CP to search for available devices on the network;

(3) Description

The detailed information of the device (Device) includes physical description and service description, and an XML structured data is obtained through HTTP.

(4) Control

Use Simple Object Access Protocol (Simple Object Access Protocol, SOAP) (HTTP/TCP) to complete the interaction between CP and each Device.

(5)Eventing

The general event notification architecture (Generic Event Notification Architecture, GENA) protocol (HTTP/TCP) is used to complete the subscription and push of device event messages. To ensure reliability, TCP transmission is used; event push also has multicast (UDP), namely UDP multicast.

(6) Expression (Presentation)

UPNP does not define the content of Presentation, the HTML page of the device customized by the manufacturer.

Based on the UPNP technology, the invention realizes the search and control of services between multi-level NATs in the home network, so as to realize service sharing. In the second step of the above-mentioned UPNP workflow, that is, the service discovery (Dissovery) stage, the SSDP protocol (UDP) is used to complete the device search with multicast, and the CP search is responded to with unicast (UDP) .

The above-mentioned devices are UPNP service devices capable of providing services, such as printers and players.

Fig. 2 is a block diagram of a method for home network service sharing provided by an embodiment of the present invention. As shown in Fig. 2, the steps include:

Step S101: The home router in the home network receives a multicast search request for searching services initiated by a UPNP service device attached to it.

Step S102: the home router searches for services in each virtual local area network where it is located by proxying the multicast search request.

Specifically, the home router judges whether its interface and the incoming interface of the multicast search message are in the same virtual local area network, if the interface of the home router and the incoming interface of the multicast search message are in the same virtual local area network , for example, are all in VLAN1, then forward the multicast search message to other UPNP devices under the VLAN1 via the interface; if the interface of the home router is not in the same virtual local area network as the incoming interface of the multicast search message For example, the incoming interface 1 of the message is in VLAN1, and another interface 2 of the home router is in VLAN2, then according to the configuration attribute of the VLAN2 where the interface 2 is located, the multicast search request is forwarded to the VLAN2 where the interface 2 is located.

Further, if the configuration attribute is an attribute used to connect to a home network, after modifying the internal network address as the source address of the multicast search request to an external network address, forward it to the virtual local area network where the interface is located, For example, forward to VLAN2 where interface 2 resides. If the configuration attribute is an attribute for connecting to the public network, the multicast search request is not forwarded.

Step S103: Respond the searched service to the UPNP service device that initiated the multicast search request.

Specifically, receive the unicast response message including device address and service type sent by other UPNP service devices in response to the multicast search request in unicast mode, and send the unicast response message to the originating group The UPNP service device that broadcasts the search request, and the unicast response message includes service type information and address information of the UPNP service device that provides the service.

Further, if the interface used to receive the unicast response message is not in the same virtual local area network as the incoming interface of the multicast search request, for example, the interface 2 receiving the unicast response message is in VLAN2, and the If the incoming interface of the message of the multicast search request is in VLAN1, the external network address as the destination address of the unicast response message is modified to the internal network address, and forwarded to the UPNP service device that initiates the multicast search request . .

FIG. 3 is a block diagram of a home network service sharing device provided by an embodiment of the present invention. As shown in FIG. 3 , it includes a request acquisition module 10 , a service search module 20 and a request response module 30 .

The request acquisition module 10 is configured to receive a multicast search request for searching services initiated by a UPNP service device attached to a home router in the home network. For example, a multicast search request of a UPNP service device attached to the home router in VLAN1 is received via interface 1, and the multicast search request is cached.

The service search module 20 is configured to search for services in each virtual local area network where the home router is located by proxying the multicast search request. For example, the service search module 20 judges whether an interface of the service search message is in the same virtual local area network as the incoming interface of the multicast search message, if the interface of the home router is in the same virtual local area network , the multicast search message is forwarded to other UPNP devices under the virtual local area network via the interface, otherwise, the multicast search request is forwarded to the virtual local area network. Further, if the configuration attribute is an attribute used to connect to a home network, the service search module modifies the internal network address as the source address of the multicast search request to an external network address, and then forwards it to the interface The virtual local area network in which it is located. If the configuration attribute is an attribute for connecting to the public network, the multicast search message is not forwarded.

The request response module 30 is configured to respond the searched service to the UPNP service device that initiated the multicast search request. Specifically, the request response module 30 receives the unicast response message including device address and service type sent by other UPNP service devices in response to the multicast search request in unicast mode, and sends the unicast response message To the UPNP service device that initiates the multicast search request, wherein the unicast response message includes service type information and address information of the UPNP service device that provides the service. Wherein, if the interface used to receive the unicast response message is not in the same virtual local area network as the incoming interface of the multicast search request, the request response module uses the unicast response message as the destination address After the external network address is changed to the internal network address, it is forwarded to the UPNP service device that initiated the multicast search request.

When the home router acting as the UPNP control point receives SSDP's multicast service request (that is, a multicast search request), it can cache the request and act as a proxy for the multicast service request. For different VLANs divided by the home router, such as WAN and LAN, Search the network where it is located, organize the result set, and then respond to the original cached service request, which is to realize the process of completing a proxy request for a specific multicast message.

FIG. 4 is a schematic diagram of home network networking provided by an embodiment of the present invention, as shown in FIG. 4 .

Example 1

When a multicast request is initiated from the previous node router (router A), router A receives the SSDP multicast search request message, judges the VLAN attribute of its own router, and forwards the message on the corresponding interface. When router B receives the request packet forwarded by router A, it forwards the packet on the corresponding interface according to the VLAN attribute of its own router. Router B receives the reply message (that is, the unicast reply message) of each interface, and replies it to router A. Router A receives the reply packet from each interface and forwards it to the inbound interface of the request packet. Specifically, the steps include:

Step 1. When the eth1 interface of router A receives an SSDP multicast discovery message (ie, a multicast search request) from the downlink device, the source IP is 192.168.1.10, the destination IP is multicast IP 239.255.255.250, and the port The number is 1900. According to the L2 multicast port forwarding table and the tag (VLAN0) of the VLAN where the inbound interface eth1 is located, the switch chip of router A forwards the multicast discovery message between the VLANs of the same tag (VLAN0). forwarded on the interface.

Step 2. For the VLAN (VLAN1) with different tags of router A, whether to forward the message needs to be judged according to the configuration attribute of the VLAN. If the WAN port of router A is in VLAN1, obtain the basic configuration attributes of the WAN port. Assume that the WAN network of the home router is configured as PPPOP, etc., and consider that this interface is connected to the public network, and there is no need to forward multicast discovery packets. This multicast discovery packet.

Step 3. Router B receives the multicast discovery message from the WAN port (192.168.1.100), and also sends the multicast discovery message between the same tag (VLAN1) according to the tag (vlan1) of the vlan where the ingress interface WAN is located. Each interface forwards (generally VLAN1 network division has only one interface of WAN, so the forwarding process cannot be seen).

Step 4. The VLAN (VLAN0) with different tags of router B is judged according to the configuration attributes of its VLAN members. For DHCP or static configuration, it is regarded as connected to the home network and needs to be grouped between this VLAN (LAN). Broadcast discovery packet forwarding. Router B forwards multicast discovery packets on interfaces eth0 and eth1. Router B judges its own routing table entry. If the inbound interface of the multicast discovery message is the default gateway interface, it does not modify the source IP address (192.168.1.10) in the multicast message, just copy and forward it directly.

Step 5. Router B waits for the response message (ie, unicast response message) from each interface, and the connected device meets the search condition of the multicast discovery message, such as 192.168.2.11 under router B. The device will respond to the multicast discovery message with a unicast reply message. According to its own routing table, router B forwards this message according to the default gateway, and reaches the eth0 interface of router A.

Step 6, router A forwards the unicast response message received on the eth0 interface and the unicast response message received by other interface eth3 to the multicast search according to the destination address 192.168.1.10 of the unicast response message Incoming interface eth1 for packets.

So far, the search process of a service ends. On the downlink control point of eth1, the service on the device directly connected to the router A interface is obtained, and the service on the device directly connected to the router B interface is also obtained.

Example 2

Initiate a multicast request from a low-node router, and the specific steps for searching for services include:

Step 1. When the eth1 interface of router B receives an SSDP multicast discovery message (ie, a multicast search request) from the downlink device, the source IP is 192.168.2.11, the destination IP is the multicast IP 239.255.255.250, and the port The number is 1900. According to the L2 multicast port forwarding table and the tag (VLAN 0) of the VLAN where the inbound interface eth1 is located, the switch chip of router B forwards the multicast discovery message to the VLAN with the same tag (VLAN 0). forwarded on each interface.

Step 2, the VLAN (VLAN 1) with different tags of router B, whether to forward the message needs to be judged according to the configuration attributes of the VLAN. If the WAN port of router B is in VLAN1, then obtain the basic configuration attributes of the WAN port, and if the network attribute of the WAN is DHCP or static configuration, then forward this IP, and at the same time, the source IP address (192.168. 2.11) Replace with the IP address after NAT conversion, or the IP address of the default gateway (192.168.1.100).

Step 3: Router A receives the multicast discovery message from eth0, and also forwards the multicast discovery message between interfaces with the same tag (VLAN0) according to the tag (v VLAN 0) of the VLAN where the ingress interface eth0 is located (here At this time, both eth1 and eth2 send this multicast discovery message).

Step 4, VLANs (VLAN 1) of different tags of router A are judged according to the configuration attributes of its VLAN members, if configuration attributes such as PPPOE, assuming that it is connected to the public network, then the forwarding of the multicast discovery message will not be carried out.

Step 5. Router A waits for the response message (ie, unicast response message) from each interface, and the connected device meets the search condition of the multicast discovery message, such as 192.168.1.10 under router A. The device will respond to the multicast discovery packet with a unicast response packet. At this time, the destination IP of the response packet is 192.168.1.100, and the source IP is 192.168.1.10. According to its own routing table, router A finds the interface eth0 where the destination IP is located and forwards the packet to the WAN interface of router B.

Step 6. Router B receives the unicast response message from the WAN interface, finds the recorded source IP of the original multicast discovery message according to the entry of the previously sent multicast discovery message, and assigns the destination IP address of the unicast response message to Modify the IP address converted by NAT, find the corresponding interface eth1 according to the routing table, and forward the unicast response message.

So far, the search process of a service ends. On the downlink control point of eth1, the service on the device directly connected to the router B interface is obtained, and the service on the device directly connected to the router A interface is also obtained.

Figure 5 is a flow chart of home network service sharing based on the networking diagram shown in Figure 4. As shown in Figure 5, router A is connected to host A and host B, and router B is connected to host A' and host B'. The specific steps include:

Step 1, router A receives the multicast search message (i.e. multicast search request) initiated by host B attached to it;

Step 2a, router A forwards the multicast search message to another host A connected thereto;

Step 2b, router A forwards the multicast search message to router B connected to it;

Step 2c, router B forwards the multicast search message to the host A' attached thereto;

Step 2d, router B forwards the multicast search message to the host B' attached thereto;

Step 3a, router A receives the unicast response message that host A under it responds to in response to the multicast search message;

Step 3c, router B receives the unicast response message that host A' attached to it responds to the multicast search message;

Step 3d, router B receives the unicast response message that host B' attached to it responds to the multicast search message;

Step 4c, router A receives the unicast response message from host A' forwarded by router B;

Step 4d, router A receives the unicast response message from host B' forwarded by router B;

Step 5c, router A forwards the unicast response message of host A' to host B;

Step 5d, router A forwards the unicast response message of host B' to host B.

In summary, the present invention has the following technical effects:

The invention realizes the agency of the home router for the multicast message by adding the function of the UPNP protocol, and realizes that all specified services in the whole home network can be searched through one search of the UPNP control point.

Although the present invention has been described in detail above, the present invention is not limited thereto, and various modifications can be made by those skilled in the art based on the principle of the present invention. Therefore, any modifications made according to the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims (10)

1. A method for home network service sharing, comprising: The home router in the home network receives a multicast search request for searching services initiated by the UPNP service device attached to it; The home router searches for services in each virtual local area network where it is located by proxying the multicast search request; Respond the searched service to the UPNP service device that initiated the multicast search request. 2. The method according to claim 1, wherein the step of searching for services in each virtual local area network where the home router is located by acting as a proxy for the multicast search request comprises: The home router judges whether its interface is in the same virtual local area network as the incoming interface of the multicast search message; If the interface of the home router and the incoming interface of the multicast search message are in the same virtual local area network, the multicast search message is forwarded to other UPNP devices under the virtual local area network via the interface; If the interface of the home router is not in the same virtual local area network as the incoming interface of the multicast search message, then forward the multicast search request to the virtual local area network where the interface is located according to the configuration attributes of the virtual local area network where the interface is located. local area network. 3. The method according to claim 2, wherein if the configuration attribute is an attribute used to connect to a home network, modify the internal network address as the source address of the multicast search request to an external network address After that, forward to the virtual local area network where the interface is located. 4. The method according to claim 3, wherein the step of responding the searched service to the UPNP service device that initiates the multicast search request comprises: Receive a unicast response message including a device address and a service type sent by other UPNP service devices in response to the multicast search request in a unicast manner, and the unicast response message includes service type information and the UPNP service device that provides the service address information; Send the unicast response message to the UPNP service device that initiated the multicast search request. 5. The method according to claim 4, wherein if the interface for receiving the unicast response message is not in the same virtual local area network as the incoming interface of the multicast search request, then the unicast After the external network address serving as the destination address of the response message is changed to an internal network address, it is forwarded to the UPNP service device that initiated the multicast search request. 6. A device for home network service sharing, comprising: The request acquisition module is used to receive a multicast search request for searching services initiated by a UPNP service device under the home router in the home network; A service search module, configured to search for services in each virtual local area network where the home router is located by proxying the multicast search request; The request response module is configured to respond the searched service to the UPNP service device that initiated the multicast search request. 7. The device according to claim 6, wherein the service search module judges whether its interface and the incoming interface of the multicast search message are in the same virtual local area network, if the interface of the home router is in the same virtual local area network as the If the incoming interface of the multicast search message is in the same virtual local area network, the multicast search message is forwarded to other UPNP devices under the virtual local area network via the interface; otherwise, according to the configuration attribute of the virtual local area network where the interface is located, the The multicast search request is forwarded to the virtual local area network where the interface is located. 8. The device according to claim 7, wherein if the configuration attribute is an attribute used to connect to a home network, the service search module uses the intranet address as the source address of the multicast search request After modifying it to an external network address, it is forwarded to the virtual local area network where the interface is located. 9. The device according to claim 8, wherein the request response module receives the unicast response report including device address and service type sent by other UPNP service devices in response to the multicast search request in unicast mode text, and send the unicast response message to the UPNP service device that initiated the multicast search request, wherein the unicast response message includes service type information and address information of the UPNP service device that provides the service. 10. The device according to claim 9, wherein if the interface used to receive the unicast response message is not in the same virtual local area network as the incoming interface of the multicast search request, the request response module After modifying the external network address as the destination address of the unicast response message to an internal network address, forward it to the UPNP service device that initiated the multicast search request.