CN101610258B - Method for filtering DOCSIS MAC address - Google Patents
Method for filtering DOCSIS MAC address Download PDFInfo
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- CN101610258B CN101610258B CN2009100894639A CN200910089463A CN101610258B CN 101610258 B CN101610258 B CN 101610258B CN 2009100894639 A CN2009100894639 A CN 2009100894639A CN 200910089463 A CN200910089463 A CN 200910089463A CN 101610258 B CN101610258 B CN 101610258B
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Abstract
The invention provides a method for filtering DOCSIS MAC address, which is characterized in that a certain amount of MAC addresses are stored inside a slice RAM according to the special format, and 4-8 bit comparators are used for filtering the DOCSIS MAC address. In the method, groups of comparison between the received MAC addresses and the MAC addresses in the RAM can be carried out. After every group of comparison, the result is obtained; if the current group has the MAC addresses which are the same as the received MAC addresses, the round of filtering is finished; if the current group has no MAC address which is the same as the received MAC addresses, the next group of comparison is carried out until all the groups of comparison between the received MAC addresses and the MAC addresses in the RAM are completed. A device for realizing the method consists of a RAM module (000), an address generation module (001), an MAC address receiving module (010), a comparator module (011) and a result generation module (100).
Description
Technical field
The invention belongs to the Network Transmission field, particularly the content of the physical layer in the Network Transmission field.
Background technology
A computer in the marked network generally has three kinds of methods at least, and the most frequently used is domain name addresses, IP address and MAC Address, respectively corresponding application layer, network layer and physical layer.
MAC (media access control medium access control) address is that burning is in network interface card.MAC Address also is hardware address or physical address, totally 48 bits (6 byte).The 0-23 position is called organizes unique identifier, is the sign of identification LAN node.The 24-47 position is to be distributed by producer oneself, and wherein the 40th is the multicast address flag bit.The physical address of network interface card is normally inserted in the nonvolatile memory of network interface card by network interface card manufacturer, and what its was stored is really to rely when transmitting data to identify the address of computer that sends data and the main frame that receives data.
In the physical layer transmission process of network bottom layer, discern main frame through physical address, it generally also is globally unique.Such as, famous Ethernet card, its physical address are the integers of 48bit, as: 44-45-53-54-00-00 deposits in the HPI with machine-readable mode.Ethernet address management organization is with ethernet address, and just the various combination of 48 bits is divided into some independently continuation address groups, and the producer of production ethernet nic just buys wherein one group, when specifically producing, gives Ethernet card with unique address one by one.
The data that the MAC layer transmits between CMTS and the CM in the HFC net are DOCSIS mac frames.DOCSIS mac frame the inside includes MAC Address, and when communicating between CMTS and the CM, receiving terminal will carry out mac address filter to the mac frame of receiving.Depositing the MAC Address of some among the RAM of receiving terminal, if the MAC Address that receives is complementary (equating with it) with a MAC Address among the RAM, this mac frame just is received, otherwise receiving terminal does not receive this mac frame.
Summary of the invention
A kind of DOCSIS mac address filter method that the present invention proposes; Its characteristics are the MAC Address of some is stored in the ram in slice by special format; The MAC Address that receives is compared with the MAC Address among the RAM; Confirm whether the MAC Address that receives is one of address stored among the RAM, the method that the present invention proposes is accomplished the DOCSIS mac address filter with 48 bit comparators.
A kind of DOCSIS mac address filter method that the present invention proposes is the MAC Address among MAC Address that receives and the RAM to be carried out one group one group comparison.Da_meet is the output result of whole device, if be 1, the MAC Address that expression receives is identical with the some MAC Addresss among the RAM; If be 0, represent that up to the present the MAC Address that receives does not have identical with the MAC Address of from RAM, reading.
It is as shown in Figure 1 that the method that the present invention proposes is carried out filter process, and MAC Address relatively is divided into the 1st group and the 2nd and above group.A byte of every reception MAC Address, this byte all will compare with first byte of first group of MAC Address among the RAM, and the record comparative result; Be kept at the MAC Address byte that receives in the MAC Address register simultaneously, after receiving 6 MAC Addresss, the 1st group address relatively finishes; Output da_meet; For the 2nd and above group, will be kept in the MAC Address register that the corresponding byte of address stored compares output da_meet in the address and RAM.If the relatively intacter da_meet=1 as a result that obtains of every group of MAC Address then filters and finishes, compare otherwise the MAC Address that receives and next are organized MAC Address, to the last one group intacter.
A kind of DOCSIS mac address filter method that the present invention proposes, its device by RAM module (000), address generating module (001), MAC Address receiver module (010), comparator module (011) and as a result generation module (100) form, as shown in Figure 2.Address generating module receives the control of this device output signal; The address that produces flows to RAM module, MAC Address receiver module and generation module as a result; The output of the output of RAM module and MAC Address receiver module compares operation in comparator module after, flow to generation module as a result.Carry out detailed introduction in the face of each module down.
RAM module (000), the MAC Address of some is being deposited in the inside, and concrete storage mode is as shown in Figure 3, but the length that defines this ram in slice store data is 32, and M group MAC Address is put in coexistence, and every group comprises 4N MAC Address.
Address ram is that the 1st byte of the the the 1st, the 2nd, the 3rd and the 4th MAC Address deposited in 32 space successively in 1 the space from a high position to the low level; From address ram is 2 to be in the space of N to the address, and what deposit is the 1st byte from the 5th MAC Address to 4N MAC Address; Address ram is in the space of N+1, and what deposit is the 2nd byte of the the the 1st, the 2nd, the 3rd and the 4th MAC Address; Identical reason is that N+2 is in the space of 2N to the address from address ram, and what deposit is the 2nd byte from the 5th MAC Address to 4N MAC Address; Down, be that 2N+1 is in the space of 6N to the address from address ram, what deposit successively is 3rd, 4th, 5th and 6th byte of the 1st MAC Address to 4N MAC Address.Like this, in RAM, the address is that 1 what deposit in being the space of 6N to the address is first group MAC Address.According to identical location mode, be that 6N+1 is that what deposit in the space of 12N is second group of MAC Address to the address from the address, next, be that 12N+1 is in the space of 6MN to the address from the address, deposit be the 3rd group to M group MAC Address.
Address generator module, this module are used to produce the address of reading of RAM.This module is controlled by the output signal da_meet of whole device, and its realization is to be controlled by inner counter, shown in the workflow Fig. 4 that shows after the realization.
Initial address is 1; After starting working, at first judge da_meet whether be 1 and current address whether be 6MN; The former representes to have among the RAM and the identical MAC Address of MAC Address that receives; All MAC Addresss relatively finish among MAC Address that the latter representes to receive and the RAM, if two kinds of situation are all set up or have a kind of situation to set up, then address generator module OPADD is 1; If either way be false, then the address of output adds 1 automatically.
The MAC Address receiver module, this module is used to receive MAC Address to be filtered.Its inside is made up of one 48 bit register, and this module receives RAM to read the control of address when work.The MAC Address receiver module only carries out MAC Address and receives operation when the MAC Address that receives and first group of MAC Address comparison among the RAM; When the MAC Address that receives and other group MAC Addresss among the RAM compared, the MAC Address receiver module carried out shifting function, and concrete workflow is as shown in Figure 5.
When RAM reads the address when being 1, the MAC Address receiver module receives the 1st byte that will be filtered MAC Address, and its method is that 48 bit registers move to left eight, and low eight are shifted into the 1st byte that will be filtered MAC Address; When RAM reads the address when being N+1, the MAC Address receiver module receives the 2nd byte of MAC Address to be filtered; When RAM reads the address when being respectively 2N+1,3N+1,4N+1 and 5N+1, the MAC Address receiver module receives the the the 3rd, the 4th, the 5th and the 6th byte of MAC Address to be filtered respectively.When receiving MAC Address, the MAC Address that receives can be immediately with RAM in MAC Address compare, concrete working method can be explained when introducing comparator module.
Receive MAC Address to be filtered; This MAC Address also with RAM in first group of MAC Address intacter, if find that identical with it MAC Address is arranged, whole device output da_meet=1; If do not find to have identical with it MAC Address; The address generator module can produce the address of back, and this moment, the MAC Address receiver module no longer carried out new MAC Address reception, and 48 inner bit registers carry out 8 bit manipulations of head and the tail ring shift left.
Comparator module; This device compares the MAC Address of MAC Address receiver module reception and the MAC Address from RAM, and the MAC Address receiver module is output as 8, and the MAC Address of exporting among the RAM is 32; Comparator module is output as 4, and internal structure is as shown in Figure 6.8 bit data of MAC Address receiver module output compare with the 31st to the 24th, the 23rd to the 16th, the 15th to the 8th of the data of RAM output and the 7th 4 group of 8 bit data to the 0th composition respectively; The size identical result is 1; Be not all 0; So module has 4 output, and this output flowed to generator module as a result.
Generator module as a result, its inside has comprised a 4N bit register, is used for depositing the MAC Address of reception and the result that every group of MAC Address of RAM compares.The result that data in the 4N bit register are represented present group successively from the low level to a high position some MAC Addresss and the MAC Address that receives compare, a certain position wherein is 1, explains that the MAC Address of this representative is identical with the MAC Address that receives.The generator module receives RAM to read the control of address as a result, and its operation principle is following.
When the data that comparator module transports were the comparative result of the 1st byte of MAC Address of the 1st byte of each MAC Address and reception among the RAM, these data were directly deposited in the 4N bit register; When the data that transport when comparator module are not the comparative result of the 1st byte of MAC Address of the 1st byte of MAC Address and reception among the RAM, the corresponding position of these data and 4N bit register with operate after, deposited in the 4N bit register again.
After one group of MAC Address among the RAM had compared with the MAC Address that receives, promptly to read the address be 6N, 12N, 18N to RAM ... During MN, the result of 4N bit register is judged.If the data in the 4N bit register have one to be 1, then da_meet=1 representes that the MAC Address among the RAM has identical with the MAC Address that receives; If everybody of the data in the 4N bit register is 0 entirely, da_meet=0 then, the MAC Address among the expression RAM is not identical with the MAC Address that receives.
A kind of DOCSIS mac address filter method that the present invention proposes through the implementation of above introduction, can realize the DOCSIS mac address filter, reduces hardware resource simultaneously, saves filtration time.
Description of drawings:
Fig. 1 is the flow chart of the method implementation procedure of the present invention's proposition;
Fig. 2 is the structure chart of whole device;
Fig. 3 is the inner data storage method of RAM;
Fig. 4 is the workflow diagram of MAC Address receiver module;
Fig. 5 is the workflow diagram of address generator module;
Fig. 6 is the structure chart of comparator module;
Fig. 7 is the workflow diagram of specific embodiment.
Embodiment:
To combine accompanying drawing below, the present invention further specified through concrete implementation process.
N is 4 in the present embodiment, and M is 4, and therefore, the MAC Address of depositing among the RAM is divided into 4 groups, and every group has 16 MAC Addresss, takies 96 address spaces of RAM altogether.
Address ram is that the 1st byte of the the the 1st, the 2nd, the 3rd and the 4th MAC Address deposited in 32 space respectively in 1 the space from a high position to the low level; From address ram be 2 be 4 space to the address in, what deposit is the 1st byte from 16 MAC Addresss of the 5th MAC Address to the; Address ram is that what deposit is the 2nd byte of the the the 1st, the 2nd, the 3rd and the 4th MAC Address in 5 the space; From address ram be 6 be 8 space to the address in, what deposit is the 2nd byte from 16 MAC Addresss of the 5th MAC Address to the; Down, from address ram be 9 be 24 space to the address in, what deposit successively is the the the 3rd, the 4th, the 5th and the 6th byte of 16 MAC Addresss of the 1st MAC Address to the.Like this, in RAM, the address is that 1 what deposit in being 24 space to the address is first group of MAC Address.Be that 25 what deposit in being 48 space to the address is second group of MAC Address from the address, next, from the address be 49 be 96 space to the address in, what deposit is the 3rd group and the 4th group of MAC Address.
The MAC Address receiver module, when RAM reads the address when being 1, the MAC Address receiver module receives the 1st byte of MAC Address to be filtered, and its method is that 48 bit registers move to left 8, and least-significant byte moves into the 1st byte of the MAC Address that receives; When RAM reads the address when being 5, the MAC Address receiver module receives the 2nd byte of MAC Address to be filtered; When RAM reads the address when being respectively 9,13,17 and 21, the MAC Address receiver module receives the the the 3rd, the 4th, the 5th and the 6th byte of MAC Address to be filtered.When receiving MAC Address, the MAC Address of reception can be immediately with RAM in MAC Address compare, first group of MAC Address in the MAC Address of reception and the RAM is intacter; If find to have identical with it MAC Address; The output da_meet=1 of whole device, if do not find that identical with it MAC Address is arranged, the address generator module can produce the address of back; This moment, the MAC Address receiver module no longer received new MAC Address, and 48 inner bit registers carry out 8 of head and the tail ring shift lefts.
Comparator module internal structure preceding text all describe.The generator inside modules has comprised one 16 bit register as a result, and when the data that comparator module transports were the comparative result of the 1st byte of MAC Address of the 1st byte of MAC Address and reception among the RAM, these data were directly deposited in 16 bit registers; When the data that transport when comparator module are not the comparative result of the 1st byte of MAC Address of the 1st byte of MAC Address and reception among the RAM, the corresponding position of these data and 16 bit registers with operate after, deposited in 16 bit registers again.
After each group MAC Address among the RAM had compared with the MAC Address that receives, promptly to read the address be 24,48,72 and 96 o'clock to RAM, and the result of 16 bit registers is judged.If the data in 16 bit registers have one to be 1, then da_meet=1 representes that the MAC Address among the RAM has identical with the MAC Address that receives; If everybody of the data in 16 bit registers is 0 entirely, da_meet=0 then, the MAC Address among the expression RAM is not identical with the MAC Address that receives.
Be the workflow of present embodiment below.
Step 1: device is started working, and at first receive MAC Address and first group of each byte of MAC Address among data that receive and the RAM compared successively, if identical MAC Address is arranged, da_meet=1, filtration finishes; If there is not identical MAC Address, da_meet=0, execution in step 2.
Step 2: second group of MAC Address compares among the MAC Address of reception and the RAM, relatively accomplishes, if identical MAC Address is arranged, and da_meet=1, filtration finishes; If there is not identical MAC Address, da_meet=0, execution in step 3.
Step 3: the 3rd group of MAC Address compares among the MAC Address of reception and the RAM, relatively accomplishes, if identical MAC Address is arranged, and da_meet=1, filtration finishes; If there is not identical MAC Address, da_meet=0, execution in step 4.
Step 4: the 4th group of MAC Address compares among the MAC Address of reception and the RAM, relatively accomplishes, if identical MAC Address is arranged, and da_meet=1, filtration finishes; If there is not identical MAC Address, da_meet=0, filtration finishes.
A kind of DOCSIS mac address filter method that the present invention proposes through the implementation of above introduction, is utilized 4 comparators, can realize the DOCSIS mac address filter, reduces hardware resource, saves filtration time.
Claims (1)
1. DOCSIS mac address filter method, its characteristics be the mac address filter device by RAM module (000), address generating module (001), MAC Address receiver module (010), comparator module (011) and as a result generation module (100) form;
Wherein, each address space of described RAM module (000) is deposited one 32 data, and M group MAC Address to be filtered is deposited in the module the inside, and every group comprises 4N MAC Address that filters;
Address ram is that the 1st byte of the the the 1st, the 2nd, the 3rd and the 4th MAC Address deposited in 32 space successively in 1 the space from a high position to the low level; From address ram is 2 to be in the space of N to the address, and what deposit is the 1st byte from the 5th MAC Address to 4N MAC Address; Address ram is in the space of N+1, and what deposit is the 2nd byte of the the the 1st, the 2nd, the 3rd and the 4th MAC Address; Identical reason is that N+2 is in the space of 2N to the address from address ram, and what deposit is the 2nd byte from the 5th MAC Address to 4N MAC Address; Down, be that 2N+1 is in the space of 6N to the address from address ram, what deposit successively is 3rd, 4th, 5th and 6th byte of the 1st MAC Address to 4N MAC Address; In RAM, the address is that 1 what deposit in being the space of 6N to the address is first group of MAC Address; According to identical location mode, be that 6N+1 is that what deposit in the space of 12N is second group of MAC Address to the address from the address, next, be that 12N+1 is in the space of 6MN to the address from the address, deposit be the 3rd group to M group MAC Address;
Described MAC Address receiver module (010); Inside is made up of one 48 bit register; This module receives external control signal and RAM to read the control of address when work; The MAC Address receiver module only with first group of RAM in the MAC Address comparison time receive the MAC Address operation, all the other times are externally carried out shifting function under the control of control signal;
When control signal effective, and RAM to read the address be 1 o'clock, the MAC Address receiver module receives the 1st byte of MAC Address to be filtered; When control signal is effective, RAM reads the address when being N+1, and the MAC Address receiver module receives the 2nd byte of MAC Address to be filtered; When control signal is effective, RAM reads the address when being 2N+1,3N+1,4N+1 and 5N+1, and the MAC Address receiver module receives the the the 3rd, the 4th, the 5th and the 6th byte of MAC Address to be filtered; All the other, when control signal was effective, 48 inner bit registers carried out 8 of head and the tail ring shift lefts;
Described address generating module (001), this module are used to produce the address of reading of RAM, and receive the control of external control signal, controlled by the output signal da_meet of whole device simultaneously, and its realization is to be controlled by inner counter;
Its course of work is: initial address is 1; After starting working, at first judge da_meet whether be 1 and current address whether be 6MN; The former representes to have among the RAM and the identical MAC Address of MAC Address that receives; All MAC Addresss relatively finish among MAC Address that the latter representes to receive and the RAM, if two kinds of situation are all set up or wherein a kind of situation is set up, then address generator module OPADD is 1; If either way be false, then the address of output adds 1 automatically;
Described comparator module (011); This module compares MAC Address receiver module (010) MAC Address that receives and the MAC Address of from RAM, reading; 8 bit data of MAC Address receiver module (010) output compare with the 31st to the 24th, the 23rd to the 16th, the 15th to the 8th of the data of RAM module (000) output and the 7th 4 group of 8 bit data to the 1st composition respectively; The size identical result is 1; Be not all 0, comparator module has 4 output, and this output is flowed to generator module as a result;
The described module of generator as a result (100), its inside have comprised a 4N bit register, are used for depositing at any time the MAC Address of reception and the result that every group of MAC Address of RAM compares; The result that data in the 4N bit register are represented present group successively from the low level to a high position some MAC Addresss and the MAC Address that receives compare, a certain position wherein is 1, explains that the MAC Address of this representative is identical with the MAC Address that receives; The generator module receives RAM to read the control of address as a result;
When the output of comparator module was the comparative result of the 1st byte of MAC Address of the 1st byte of MAC Address and reception among the RAM, the output of this comparator module was directly deposited in the 4N bit register; When the dateout of comparator module is not the comparative result of the 1st byte of MAC Address of the 1st byte of MAC Address and reception among the RAM, the corresponding position of these data and 4N bit register with operate after, deposited in the 4N bit register again.
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| CN1490991A (en) * | 2002-10-18 | 2004-04-21 | 华为技术有限公司 | Method for virtual Ethernet adapter card |
| CN1579068A (en) * | 2002-09-02 | 2005-02-09 | 索尼株式会社 | Device authentication apparatus device authentication method information processing apparatus information processing method and computer program |
| CN101072239A (en) * | 2007-06-25 | 2007-11-14 | 中兴通讯股份有限公司 | Method and device for realizing IP address filtering |
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| CN1489339A (en) * | 2002-07-06 | 2004-04-14 | ���ǵ�����ʽ���� | Method for insuring user's anonymous and its wireless local network system |
| CN1579068A (en) * | 2002-09-02 | 2005-02-09 | 索尼株式会社 | Device authentication apparatus device authentication method information processing apparatus information processing method and computer program |
| CN1490991A (en) * | 2002-10-18 | 2004-04-21 | 华为技术有限公司 | Method for virtual Ethernet adapter card |
| CN101072239A (en) * | 2007-06-25 | 2007-11-14 | 中兴通讯股份有限公司 | Method and device for realizing IP address filtering |
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