CN101068229A - Content filtering gateway realizing method based on network filter - Google Patents
Content filtering gateway realizing method based on network filter Download PDFInfo
- Publication number
- CN101068229A CN101068229A CNA2007101003312A CN200710100331A CN101068229A CN 101068229 A CN101068229 A CN 101068229A CN A2007101003312 A CNA2007101003312 A CN A2007101003312A CN 200710100331 A CN200710100331 A CN 200710100331A CN 101068229 A CN101068229 A CN 101068229A
- Authority
- CN
- China
- Prior art keywords
- packet
- module
- connection
- network
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012545 processing Methods 0.000 claims description 29
- 230000009467 reduction Effects 0.000 claims description 17
- 230000006870 function Effects 0.000 claims description 7
- 230000003139 buffering effect Effects 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 241000700605 Viruses Species 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000006399 behavior Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 206010019233 Headaches Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- ZXQYGBMAQZUVMI-GCMPRSNUSA-N gamma-cyhalothrin Chemical compound CC1(C)[C@@H](\C=C(/Cl)C(F)(F)F)[C@H]1C(=O)O[C@H](C#N)C1=CC=CC(OC=2C=CC=CC=2)=C1 ZXQYGBMAQZUVMI-GCMPRSNUSA-N 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009385 viral infection Effects 0.000 description 1
Images
Landscapes
- Computer And Data Communications (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
A method for realizing content filtering gateway based on network filter includes realizing network content analysis and real time monitor as well as realizing purpose of filtering application layer information at network layer based on Linux system platform, utilizing network filter Net-filter frame to carry out collection and filtering on data packet under kernel state for optimizing network path of data packet and for raising collection efficiency of data, furthermore using shared internal memory technique of user space and kernel space to submit session content from kernel state to content filtering module of user state.
Description
Technical field
The invention belongs to communication technical field, specific design kernel state data packet is gathered and is filtered, the session reduction, and user's attitude is communicated by letter with kernel state, the realization of transparent mode etc.Can filter according to the session complete content, stop illegal packet to pass through.
Background technology
The Internet has satisfied the paramount boundary of the breakthrough space-time of " soon " and " without limits " that people try hard to gain for thousands of years, realizes the dream of people's freedom, and he has agreed with people's original person's character, and " freedom " degree that reaches surmounted former people's the imagination.The opening of the Internet, allow people like never before enjoy the freedom of the various information of unfettered acquisition issue speech, but also brought many information security issues simultaneously.
Data show that the teenager spent the time that has been less than online in the time of seeing TV in recent years, network is just becoming the world, the acquire knowledge of teenager understanding, a kind of instrument of amusement and recreation.The information content in the network is multifarious, mostly not through strict checking on and screening, though can satisfy the needs in part education, information and the leisure, but also exist to allow the head of a family, society's headache in a large number, easily obscene pornographic, the websites such as violence is terrified, anti-government and racial discrimination that the teenager is had a negative impact.
The second class safety problem is the threat of virus infections and spam.The harmful code that is hidden in the network is attacked computer by virus, worm, trojan horse program etc., and these viruses are constantly increasing, and development speed is suitable fast, and destructiveness is more and more big.Intellectuality, hommization, hiddenization, variation are also in the development trend that becomes the new century computer virus gradually.A large amount of spams has also had a strong impact on the normal use of user to the Internet, a large amount of spams have reduced network operation efficient and have taken the network bandwidth, cause mail server congested, and then reduce whole network operating efficiency, bring influence for other users on the station server that coexists.
An other category information safety problem is exactly the threat to confidential information.Utilize now network steal or the case of leakage company secret of common occurrence.This behavior has brought huge harm to enterprise.The newest fruits of enterprise, core competitiveness may not exist in a flash, thereby causes enormous economic loss.The enterprise that has is for fear of this phenomenon, even forbids that the employee goes up the Internet, and this has brought very big inconvenience to work undoubtedly.
Information filtering is the new problem of network security, and its task is to filter out non-demand information relatively more fixing in one period from dynamic information source.By in network, adding the content analysis filtering function, internally can help protected network to eliminate the leakage that confidential information is caused by network, externally can filter out unhealthy content and junk information in the network.Both can stop the infringement of flame, adapt to the requirement of society, simultaneously the ideology aspect to people, by standard user's internet behavior, increase work efficiency, rationally utilize Internet resources, reduce the infringement of virus, the basic intension of information filtering technology that Here it is to network.
At present, comprise the packet filtering technology of layer Network Based and based on the agent skill group of application layer in the filtration of network boundary.
The packet filtering technology of layer Network Based, according to the packet header source address, signs such as destination address and port numbers, protocol type determine whether to allow packet to pass through.Have only the packet that satisfies filter logic just to be forwarded to the corresponding target ground port of export, remainder data Bao Ze is abandoned from data flow.But this mode can't be understood application layer message, and most of information filtering is all carried out at application layer, so be difficult to carry out information filtering.When this mode is carried out information filtering in addition, be to carry out single packet filtering,, influence accuracy owing to lack context relation information.
Based on the agent skill group of application layer, also be application gateway, it acts on application layer, and the network traffic flow that has been characterized in complete " obstruct " by to every kind of special Agent of application service establishment, realizes monitoring and the effect of control application layer communication stream.Application level proxy can be understood various application protocols, can easily carry out information filtering, but opaque to the user, is necessary for every kind of application and writes different Agents respectively.And speed is slower, and is bigger to network performance.
Summary of the invention
The objective of the invention is to propose a kind of content filtering gateway implementation method of filter Network Based, can improve the efficient of data acquisition, illegal packet is carried out real-time blocking-up, with transparent way work, efficiently in network layer filtration application layer information.
A kind of content filtering gateway implementation method of filter Network Based, with content filtering gateway transparent be connected on network boundary, in no IP mode, filter the data of all local area network (LAN)s of coming in and going out in network layer, the content filtering gateway of the telling operation Linux kernel of institute 2.4 operating systems, two network interface cards are installed, and every network interface card all is set to promiscuous mode, uses two network interface cards of brctl configuration to realize transparent being connected on the network boundary as bridge.
The invention is characterized in and contain following steps successively:
Be provided with in the described content filtering Central Shanxi Plain:
The packet capture module, processing data packets module, and packet forwarding module, these modules are operated in the kernel state of linux system, also are provided with content analysis module, are operated in user's attitude; In described these modules:
The packet capture module has been registered the filter function of setting, and for those packets that need transmit, is sent to the packet forwarding module and transmits, and carries out the packet of information filtering for needs, then is sent to the processing data packets module;
The processing data packets module, the tcp data bag that the needs that the packet trapping module is sent carry out content analysis, at first by sequence number order buffer memory in buffering area, when capturing all packets of a connection, restore the application layer data content of this connection, give the content analysis module that is operated in user's attitude and analyze, legally just give all packets that the packet forwarding module is transmitted this connection successively, illegally just block this connection, its treatment step is as follows successively:
Treatment step (1): for each packet is set up an inode structures, structure comprises three: the socket buffer pointer of this bag, the sequence number of this bag, point to the pointer of next packet inode structures, first packet that is a connection is set up the index node header structure, sign as this TCP connection, this structure comprises: the socket buffer pointer of this bag, the sequence number of this bag, source IP address, purpose IP address, source port, destination interface, point to the pointer of next packet inode structures, construct a packet array of indexes again, pointer that points to the index node header structure of each storage in the array, the index of all packets is safeguarded by a two-dimensional chain table like this, laterally store the packet index that same TCP connects, the packet index that vertically storage difference connects, each is initialized as 0 to set affiliated packet array of indexes, and the packet index is inserted in the two-dimensional chain table;
Treatment step (2): when the tcp data bag arrived, whether the data length of judgment data bag was 0, if 0, check whether the Fin flag bit of packet is 1, the Fin flag bit is a TCP johning knot bundle flag, if be not 1, just should wrap forwarding; If 1, show that then the affiliated TCP connection of this packet finishes, and carries out the content reduction to this connection; If the data length of packet is not 0, then need the index node of this packet is inserted in the two-dimensional chain table;
Treatment step (3): whether first element of judgment data bag array of indexes is 0, if be 0, then creates the index node header structure for this packet, and first packet that connects as article one inserts two-dimensional chain table; If be not 0, judge whether this packet belongs to this connection, according to source IP address, purpose IP address, source port, these four unique definite connections of destination interface are not if belong to this connection, then compare with other elements of array successively, it is empty connecting under finding or finding an array element, if array element is empty, then creates the index node header structure for this packet, first packet as a new connection inserts two-dimensional chain table, if found affiliated connection, judge whether to be first packet, if, create the index node header structure, insert this and connect first position; If not, create inode structures and press TCP sequence number insertion tram, and preserve the head pointer of this connection, judge at last whether this packet Fin flag bit is 1, if be not 1, utilize network filter Netfilter framework standard return value NF_STOLEN, tell the operating system protocol stack no longer this packet to be handled; If be 1, carry out the content reduction to connecting under this packet;
Treatment step (4): judge whether to obtain treating the head pointer of content reduction connection,, in array, find this connection if do not have; If obtain, just take out the application layer data that this connects each packet successively, put into shared buffer;
The content analysis filtering module, keeper's designated key speech, and the weight of each keyword, and set all and connect common weight limit of obeying, after receiving the content analysis request that the processing data packets module is sent, from described shared buffer, read the application layer data of this connection, by the QS-DFSA algorithm, be that reverse finite automaton computer step-length string matching algorithm is added up the occurrence number that each sets keyword, calculate the product of each keyword weight and occurrence number, addition summation again obtains the weight of this connection, and all of the weight that will connect and keeper's setting are connected jointly the filtration weight limit of obedience and compare again, surpass weight limit and just think illegal, otherwise be exactly legal;
Step 2.1: the packet capture module after receiving the tcp data bag that network is sent, according to source IP address, purpose IP address, source port, destination interface, protocol type for the packet that needs are transmitted, then sends to the packet forwarding module and transmits; Needs are carried out the packet of information filtering, send to the processing data packets resume module;
Step 2.2: the processing data packets module is after receiving the tcp data bag that need carry out information filtering, handle by described processing data packets step, after finishing, a connection just restores the data of this connection, put into shared buffer, and the content of announcement analysis module removes the shared buffer read data;
Step 2.3: content analysis module is after receiving processing data packets module notice, and read data is analyzed from shared buffer, and the result is returned to the processing data packets module;
Step 2.4: the blocking-up of processing data packets module is illegal to be connected; Giving the packet forwarding module for legal connection transmits.
Described processing data packets module will pass to the information filtering module of user's attitude through the original contents that TCP session reduction obtains by the method for user's space and kernel spacing shared drive.
Described processing data packets module when carrying out TCP session reduction, is buffered in the packet that contains data in this connection in the gateway by the TCP sequence number successively, and replaces receiving terminal to send the affirmation bag to transmitting terminal.
When described data forwarding module is transmitted packet successively by the TCP sequence number, contemporary for transmitting terminal confirmation of receipt bag.
Application level proxy is the filtration of carrying out at user's space.After packet is caught by network interface card, flow through each layer in the operating system network protocol stack, arrive application layer at last and filtering.Also have some user's spaces packet capture technology commonly used, they for example utilize the SOCKET raw socket from the packet that data link layer is directly caught, Libpcap etc., but all be to adopt the mode of system call to realize.Packet from kernel state when user's attitude transmits, be with single message driving mechanism, promptly application layer is whenever carried out primary system and is called, and reads a packet from kernel.This method is separated with operating system nucleus, has very big drawback.System call is unusual consume system resources, and each system call all can bring a context to switch, and the hit rate of Cache is had a significant impact.Along with the increase of network traffics, the increase of packet in the network, system call will be very frequent, has a strong impact on systematic function.Add and whenever catch all memory copyings once of a packet, make network data acquisition become the bottleneck of whole contents filtration system from kernel state to user's attitude.
By relatively finding that the solution of the present invention and technology have following characteristics:
Transparent working method makes the easier maintenance of network, is that fire compartment wall is not easy to be attacked.
Optimize network path.Carry out packet filtering at kernel spacing and just there is no need to travel through whole network protocol stack, Netfilter is the packet of catching in network layer, destiny that just can the determination data bag here, and some packets just there is no need flowing to the upper strata.
Reduce the switching of user's space and kernel spacing.For example the SOCKET raw socket has been caught all packets from data link layer, they is delivered to user's space judge.And in the filtration that kernel spacing carries out, be under kernel state, to filter, only transmit the user and want the data that obtain to user's space.
Session is reduced to TCP, avoids the accuracy of the filtration that reduces greatly because session information is imperfect in the filter type packet-by-packet.
During the session reduction, System Agent receives, and sends and confirms, has solved data cached influence to communication, has safeguarded the transparency.
Utilize buffering further to reduce the switching of user's space and kernel spacing.Under kernel state, open up buffering area, in batches transmit data to user's space.
Utilize share memory technology, reduce the data copy and switch with the space.
Description of drawings
Fig. 1 is the network insertion figure of the content filtering gateway of a kind of filter Network Based of the present invention;
Fig. 2 is the overall framework of the content filtering gateway of a kind of filter Network Based of the present invention;
Fig. 3 is the data structure that TCP session reduction is used among the present invention;
Fig. 4 is flow chart of data processing figure among the present invention;
Fig. 5 is the content analysis module workflow diagram;
Fig. 6 is the workflow diagram of the content filtering gateway of a kind of filter Network Based of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
The present invention, a kind of content filtering gateway of filter frame Network Based, purpose is to realize real-time information filtering at network boundary, in network layer filtration application layer information.Core of the present invention is as Fig. 1, and the gateway of telling (2) is installed two network interface cards, and two network interface cards all are set to promiscuous mode, uses two network interface cards of brctl configuration to be bridge.Network interface card of gateway connects router (1), and this is unique outlet that network leads to internet; Another piece network interface card connects switch (3), and system just filters in network with the transparent way string like this.Equipment on network configuration and the network does not need to make any change like this, just can be in the content filtering system access network; When content filtering system breaks down, also can directly from network, shift out, handle, do not influence the network operate as normal.Core of the present invention also comprises TCP connection carrying out session reduction, gives user's space with the initial data that restores from kernel spacing by shared drive.
As Fig. 2, packet capture module in the described gateway, the processing data packets module, the packet forwarding module is operated in kernel state; Information filtering module and service management unit are operated in user's attitude.Numeral in the figure bracket is according to the execution sequence of time order and function.
In the outlet that is connected on network that the content filtering gateway of filter Network Based is transparent, all flow through his data as lead one spline filter.So the packet capture module in 5 hook points of network filter Netfilter framework, is only selected first hook point, just at NF_IP_PRE_ROUTING, the registration filter function filters the packet of all inflows.According to the source port number of user's appointment, destination slogan, source IP address, purpose IP address, protocol type information is directly transmitted the packet that does not need to carry out information filtering, and what need just passes to the processing function with the sk_buff descriptor pointer and the TCP head pointer of this packet.
In the processing data packets module, carry out TCP session reduction.Packet for carrying out content analysis is buffered in the gateway, adopts the two-dimensional chain table data structure to preserve, and laterally preserves the packet of same connection, vertically preserves different the connection.According to source IP address, purpose IP address, source port number, the unique definite connection of these four signs of destination slogan.Data structure such as Fig. 3.Socket buffer is not advocated and is duplicated, only transfers control in kernel.So, do not duplicate in handling to the packet of buffering yet, be that each packet is created an inode structures, point to its buffering area.Index node is being handled.Define an index node head in addition, point to the inode structures of first packet of each session.
The handling process of packet such as Fig. 4.For example the primary structure of packet is as follows:
Source IP address: 172.21.15.231
Source port number: 9817
Purpose IP address: 202.112.78.101
Destination slogan: 80
Sequence number: 2901378913
Syn is masked as: 0
Fin is masked as: 1
IP header length: 5
TCP header length: 5
When packet arrived, at first buffer memory TCP wrapped.Whether the judgment data bag comprises data then, and the len field deducts IP head length and TCP head length among the sk_buff, and promptly len-4*5-4*5 is exactly an application layer data length, if be the zero free of data of just representing.So will be if having with data pack buffer, with its index node insertion chained list.If no, do not carry out buffer memory.Whether no matter have data all will check the FIN flag bit, the FIN flag bit is 1, and representative connects end, carries out reduction of data.Do not check the SYN flag bit, connection bag in the three-way handshake process and affirmation bag do not comprise data, and just application layer length is 0, all is forwarded.
The synchronization cached data packet is to belong to many connections, must treat with a certain discrimination.Every connects when finishing, and discharges the space of this connection.
Judge at first whether array of pointers is empty, if be empty just with the head node of this node as first connection.If array of pointers is not empty, will with head node reference source port numbers, the destination slogan, source IP address, whether purpose IP address identical with this bag, judges whether it is same connection.If, at first with head node sequence number relatively, if in the head node sequence number less than 2901378913, this packet is exactly new head node so, if greater than, just it is inserted with in the preface chained list by sequence number.Just compare downwards successively if not same connection,, find that perhaps next seat for empty, just rebulids a connection with it as head node up to finding.Finish when inserting index node and withdrawing from, remember the head node of this connection.
This bag FIN flag bit is 1, proves that session content has transmitted to finish.At this moment take out the data content of all cached data packet successively, copy it to shared drive district, the sk_buff structure still keeps, and waits for the judged result of user's space, legal forwarding, and illegal abandons.
Because this packet that has the FIN flag bit is just to have inserted formation, and head pointer is returned, and supposes to be kept among the P, so just can directly reduce.If no, the head node that must be connected with each successively relatively reduces after determining to connect.Last notification protocol stack is forgotten these packets.
As Fig. 5, content analysis module keeper's designated key speech, and each keyword weight, and weight limit is set.After receiving the content analysis request that the processing data packets module is sent, from shared buffer, read the application layer data of this connection.Add up the frequency of occurrences that each sets keyword by the multi-key word matching algorithm, the product that calculates keyword weight frequency add and, weight is compared with the filtration weight limit that the keeper sets, such as: keyword set is combined into { independence for Taiwan, the war in Iraq }, if when the keeper wishes to filter domestic political problem, should give bigger weight for "independence of Taiwan", it is 5 that "independence of Taiwan" is set weight, and " the war in Iraq " sets weight is 1.The "independence of Taiwan" keyword occurs one time, the weight of whole contents increases by 5, and " the war in Iraq " occurs once, and the whole contents weight increases by 1.Suppose that the content weight has surpassed weight limit 15, then should connect illegal.
All need carry out the packet of content analysis, all must be retained in the information filtering fire compartment wall in legal not determining whether.Connect for a TCP, when server sends a packet to client, will send one after client is received and confirm bag to server, if server is not received this affirmation bag, server will retransmit this bag so.When the user end to server end sends data also is like this.If we have caught a packet in the connection, receiving terminal is not received, can not confirm yet, transmitting terminal will retransmit after overtime, and so long-time, connection will be broken, so just destroyed the transparency.In order not influence normal network communication.As Fig. 6, gateway replaces receiving terminal to send affirmation, like this, transmitting terminal will continue to send next bag, when receiving the data of enough carrying out information filtering, gives the filter algorithm analysis with data, confirm legal packet, once sending to receiving terminal, blocking the affirmation bag of receiving terminal simultaneously, because transmitting terminal was received.When we analyzed, this connection was still to keep, because the default time of the keepalive timer of TCP is sufficiently long.
Select the shared drive mode to realize the data interaction of user's space and kernel spacing.(kernel is known the process number of consumer process for pid, sig) routine, just can send signalisation content analysis module data in the internal memory of sharing by kernel to select send_sign.The process of memory-mapped is: kernel buffer memory of application under kernel state, by the proc file system consumer process is passed in the address of this buffer memory; Consumer process is obtained buffer address by reading the proc file system, utilizes mmap that this buffer memory is carried out map addresses, thereby can be from reading of data wherein.
In a word, a kind of content filtering gateway implementation method of filter Network Based has realized real time filtering and monitoring to session content with transparent way at network egress, in network layer filtration application layer information, illegal packet is blocked with being connected at once.The reduction of session has been improved the accuracy of information filtering.Utilize network filter Netfilter framework, data acquisition technology in conjunction with memory-mapped, not only avoided system call, reduced the switching between user's attitude and the kernel mode, and user's attitude program is directly operated shared drive, reduced the copy number of times of data, performance is significantly improved at kernel spacing and user's space.Transparent working method is also strong has avoided malicious attack.
Claims (3)
1, a kind of content filtering gateway implementation method of filter Network Based, it is characterized in that, this method with content filtering gateway transparent be connected on network boundary, in no IP mode, filter the data of all local area network (LAN)s of coming in and going out in network layer, described content filtering gateway operation Linux kernel 2.4 operating systems, two network interface cards are installed, every network interface card all is set to promiscuous mode, use two network interface cards of brctl configuration to realize transparent being connected on the network boundary as bridge, described content filtering gateway is realized information filtering successively according to the following steps:
Step 1, initialization:
Be provided with in the described content filtering Central Shanxi Plain:
The packet capture module, processing data packets module, and packet forwarding module, these modules are operated in the kernel state of linux system, also are provided with content analysis module, are operated in user's attitude; In described these modules:
The packet capture module has been registered the filter function of setting, and for those packets that need transmit, is sent to the packet forwarding module and transmits, and carries out the packet of information filtering for needs, then is sent to the processing data packets module;
The processing data packets module, the tcp data bag that the needs that the packet trapping module is sent carry out content analysis, at first by sequence number order buffer memory in buffering area, when capturing all packets of a connection, restore the application layer data content of this connection, give the content analysis module that is operated in user's attitude and analyze, legally just give all packets that the packet forwarding module is transmitted this connection successively, illegally just block this connection, its treatment step is as follows successively:
Treatment step (1): for each packet is set up an inode structures, structure comprises three: the socket buffer pointer of this bag, the sequence number of this bag, point to the pointer of next packet inode structures, first packet that is a connection is set up the index node header structure, sign as this TCP connection, this structure comprises: the socket buffer pointer of this bag, the sequence number of this bag, source IP address, purpose IP address, source port, destination interface, point to the pointer of next packet inode structures, construct a packet array of indexes again, pointer that points to the index node header structure of each storage in the array, the index of all packets is safeguarded by a two-dimensional chain table like this, laterally store the packet index that same TCP connects, the packet index that vertically storage difference connects, each is initialized as 0 to set affiliated packet array of indexes, and the packet index is inserted in the two-dimensional chain table;
Treatment step (2): when the tcp data bag arrived, whether the data length of judgment data bag was 0, if 0, check whether the Fin flag bit of packet is 1, the Fin flag bit is a TCP johning knot bundle flag, if be not 1, just should wrap forwarding; If 1, show that then the affiliated TCP connection of this packet finishes, and carries out the content reduction to this connection; If the data length of packet is not 0, then need the index node of this packet is inserted in the two-dimensional chain table;
Treatment step (3): whether first element of judgment data bag array of indexes is 0, if be 0, then creates the index node header structure for this packet, and first packet that connects as article one inserts two-dimensional chain table; If be not 0, judge whether this packet belongs to this connection, according to source IP address, purpose IP address, source port, these four unique definite connections of destination interface are not if belong to this connection, then compare with other elements of array successively, it is empty connecting under finding or finding an array element, if array element is empty, then creates the index node header structure for this packet, first packet as a new connection inserts two-dimensional chain table, if found affiliated connection, judge whether to be first packet, if, create the index node header structure, insert this and connect first position; If not, create inode structures and press TCP sequence number insertion tram, and preserve the head pointer of this connection, judge at last whether this packet Fin flag bit is 1, if be not 1, utilize network filter Netfilter framework standard return value NF_STOLEN, tell the operating system protocol stack no longer this packet to be handled; If be 1, carry out the content reduction to connecting under this packet;
Treatment step (4): judge whether to obtain treating the head pointer of content reduction connection,, in array, find this connection if do not have; If obtain, just take out the application layer data that this connects each packet successively, put into shared buffer;
The content analysis filtering module, keeper's designated key speech, and the weight of each keyword, and set all and connect common weight limit of obeying, after receiving the content analysis request that the processing data packets module is sent, from described shared buffer, read the application layer data of this connection, by the QS-DFSA algorithm, be that reverse finite automaton computer step-length string matching algorithm is added up the occurrence number that each sets keyword, calculate the product of each keyword weight and occurrence number, addition summation again obtains the weight of this connection, and all of the weight that will connect and keeper's setting are connected jointly the filtration weight limit of obedience and compare again, surpass weight limit and just think illegal, otherwise be exactly legal;
Step 2, carry out packet content successively according to the following steps and filter:
Step 2.1: the packet capture module after receiving the tcp data bag that network is sent, according to source IP address, purpose IP address, source port, destination interface, protocol type for the packet that needs are transmitted, then sends to the packet forwarding module and transmits; Needs are carried out the packet of information filtering, send to the processing data packets resume module;
Step 2.2: the processing data packets module is after receiving the tcp data bag that need carry out information filtering, handle by described processing data packets step, after finishing, a connection just restores the data of this connection, put into shared buffer, and the content of announcement analysis module removes the shared buffer read data;
Step 2.3: content analysis module is after receiving processing data packets module notice, and read data is analyzed from shared buffer, and the result is returned to the processing data packets module;
Step 2.4: the blocking-up of processing data packets module is illegal to be connected; Giving the packet forwarding module for legal connection transmits.
2, the content filtering gateway implementation method of a kind of filter Network Based according to claim 1, it is characterized in that, described processing data packets module will pass to the information filtering module of user's attitude through the original contents that TCP session reduction obtains by the method for user's space and kernel spacing shared drive.
3, the content filtering gateway implementation method of a kind of filter Network Based according to claim 1, it is characterized in that, described processing data packets module, when carrying out TCP session reduction, the packet that contains data in this connection is buffered in the gateway successively by the TCP sequence number, and replaces receiving terminal to send the affirmation bag to transmitting terminal;
When described packet forwarding module is transmitted packet successively by the TCP sequence number, contemporary for transmitting terminal confirmation of receipt bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101003312A CN100558089C (en) | 2007-06-08 | 2007-06-08 | A kind of content filtering gateway implementation method of filter Network Based |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101003312A CN100558089C (en) | 2007-06-08 | 2007-06-08 | A kind of content filtering gateway implementation method of filter Network Based |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101068229A true CN101068229A (en) | 2007-11-07 |
| CN100558089C CN100558089C (en) | 2009-11-04 |
Family
ID=38880666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101003312A Expired - Fee Related CN100558089C (en) | 2007-06-08 | 2007-06-08 | A kind of content filtering gateway implementation method of filter Network Based |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100558089C (en) |
Cited By (56)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009115002A1 (en) * | 2008-03-20 | 2009-09-24 | 成都市华为赛门铁克科技有限公司 | Method for buffering and forwarding data packets on a gateway device and the gateway device thereof |
| CN101582822A (en) * | 2008-05-14 | 2009-11-18 | 3柯姆公司 | Open network connection |
| CN101827102A (en) * | 2010-04-20 | 2010-09-08 | 中国人民解放军理工大学指挥自动化学院 | Data prevention method based on content filtering |
| CN101827070A (en) * | 2009-03-06 | 2010-09-08 | 英华达股份有限公司 | Portable communication device |
| CN101345687B (en) * | 2008-08-21 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Method and system for packet transmission in Linux network bridge mode |
| CN101877704A (en) * | 2010-06-02 | 2010-11-03 | 中兴通讯股份有限公司 | Network access control method and service gateway |
| CN101252527B (en) * | 2008-04-09 | 2011-01-26 | 腾讯科技（深圳）有限公司 | Method for transferring network, network transfer server and inner core managing module |
| CN102098289A (en) * | 2010-12-17 | 2011-06-15 | 天津曙光计算机产业有限公司 | Network security accessing and sealing method based on FPGA (field programmable gate array) |
| CN102340428A (en) * | 2011-09-29 | 2012-02-01 | 哈尔滨安天科技股份有限公司 | URL (Uniform Resource Locator) detection and interception method and system based on network packet loss |
| CN102480437A (en) * | 2010-11-23 | 2012-05-30 | 中兴通讯股份有限公司 | Method and device for controlling internet surfing data of home gateway |
| CN101848190B (en) * | 2009-03-23 | 2012-08-08 | 北京鼎信高科信息技术有限公司 | Data packet matched processing method based on IP (Internet Protocol) address set and port set |
| WO2012103846A2 (en) * | 2012-04-05 | 2012-08-09 | 华为技术有限公司 | Network security processing method, system, and network card |
| CN102695049A (en) * | 2012-05-09 | 2012-09-26 | 浙江宇视科技有限公司 | Transmission method and apparatus of code stream |
| CN102761517A (en) * | 2011-04-25 | 2012-10-31 | 工业和信息化部电信传输研究所 | Content reduction method for high-speed network |
| CN102821100A (en) * | 2012-07-25 | 2012-12-12 | 河南省信息中心 | Method for realizing streaming file system based on security gateway of network application layer |
| CN101651672B (en) * | 2008-08-14 | 2012-12-19 | 鸿富锦精密工业（深圳）有限公司 | Network device and method for processing encapsulated packet |
| CN101783786B (en) * | 2009-01-19 | 2013-01-16 | 中兴通讯股份有限公司 | Method and device for filtering data packets |
| CN103001958A (en) * | 2012-11-27 | 2013-03-27 | 北京百度网讯科技有限公司 | Exception transmission control protocol (TCP) message processing method and device |
| CN103023914A (en) * | 2012-12-26 | 2013-04-03 | 北京神州绿盟信息安全科技股份有限公司 | Firewall system and implementation method thereof |
| CN103414725A (en) * | 2013-08-21 | 2013-11-27 | 北京网秦天下科技有限公司 | Method and device used for detecting and filtering data message |
| CN103428216A (en) * | 2013-08-12 | 2013-12-04 | 深圳市吉祥腾达科技有限公司 | Method and system for improving firewall performance |
| CN103763150A (en) * | 2014-01-02 | 2014-04-30 | 中国人民解放军装甲兵工程学院 | Data acquisition system |
| CN103929418A (en) * | 2014-03-28 | 2014-07-16 | 汉柏科技有限公司 | Wireless Internet access method and system based on network safety equipment |
| CN103973476A (en) * | 2013-02-06 | 2014-08-06 | 上海杰之能信息科技有限公司 | Gateway, and gateway hot backup system and method |
| WO2014180397A1 (en) * | 2013-12-16 | 2014-11-13 | 中兴通讯股份有限公司 | Network data packet sending method and device |
| CN104184659A (en) * | 2013-05-22 | 2014-12-03 | 上海贝尔股份有限公司 | Method and device for obtaining data packet in network |
| CN104205727A (en) * | 2012-01-27 | 2014-12-10 | 诺基亚通信公司 | Session termination in a mobile packet core network |
| CN104202315A (en) * | 2014-08-25 | 2014-12-10 | 山东超越数控电子有限公司 | Network data package filtering method based on Power PC hardware frame |
| CN104243107A (en) * | 2013-06-06 | 2014-12-24 | 深圳市腾讯计算机系统有限公司 | Data transmission method, device, terminal, server and system |
| CN104348656A (en) * | 2013-08-07 | 2015-02-11 | 中国移动通信集团北京有限公司 | Data acquisition method and device |
| CN104468417A (en) * | 2014-12-16 | 2015-03-25 | 上海斐讯数据通信技术有限公司 | Stacking switch message transmission method and system and stacking switch |
| CN104796413A (en) * | 2015-04-02 | 2015-07-22 | 哈尔滨工程大学 | Grouping dynamic storage method facing Web firewall |
| CN105162796A (en) * | 2015-09-24 | 2015-12-16 | 上海上讯信息技术股份有限公司 | Data transmission method and equipment |
| CN106454837A (en) * | 2016-08-25 | 2017-02-22 | 上海斐讯数据通信技术有限公司 | Access point switching device and switching method thereof |
| CN106487945A (en) * | 2016-09-09 | 2017-03-08 | 中国互联网络信息中心 | A kind of DNS forwarding inquiries method |
| CN106487797A (en) * | 2016-10-25 | 2017-03-08 | 腾讯科技（深圳）有限公司 | A kind of network data processing method and system |
| CN106649036A (en) * | 2016-11-24 | 2017-05-10 | 北京瑞星信息技术股份有限公司 | Method and device for Linux network access monitoring |
| CN106850565A (en) * | 2016-12-29 | 2017-06-13 | 河北远东通信系统工程有限公司 | A kind of network data transmission method of high speed |
| CN107395619A (en) * | 2017-08-17 | 2017-11-24 | 深圳市盛路物联通讯技术有限公司 | A kind of safety communicating method and system |
| CN107633380A (en) * | 2017-08-30 | 2018-01-26 | 北京明朝万达科技股份有限公司 | The task measures and procedures for the examination and approval and system of a kind of anti-data-leakage system |
| CN107659511A (en) * | 2017-08-16 | 2018-02-02 | 华为技术有限公司 | A kind of overload controlling method, main frame and storage medium and program product |
| CN107809377A (en) * | 2016-09-09 | 2018-03-16 | 卡斯柯信号有限公司 | The realization device and method of a kind of universal gateway |
| CN108200026A (en) * | 2017-12-27 | 2018-06-22 | 山东华软金盾软件股份有限公司 | The method that rst blocking packets are sent based on ipv6 |
| CN108965061A (en) * | 2018-08-03 | 2018-12-07 | 上海欣诺通信技术股份有限公司 | Packet capture device and method, reduction apparatus and method, system and medium |
| CN109298931A (en) * | 2017-07-25 | 2019-02-01 | 迈普通信技术股份有限公司 | The on-demand method for releasing in buffer area and the network equipment |
| CN109510795A (en) * | 2017-09-14 | 2019-03-22 | 蓝盾信息安全技术股份有限公司 | A kind of intelligent DDOS defense technique based on isolated device |
| CN109587082A (en) * | 2019-01-10 | 2019-04-05 | 烽火通信科技股份有限公司 | A kind of asynchronous repeater system of message based on (SuSE) Linux OS and method |
| CN109951425A (en) * | 2017-12-21 | 2019-06-28 | 张家界航空工业职业技术学院 | TCP flow state integrity detection method based on FPGA |
| CN109962885A (en) * | 2017-12-22 | 2019-07-02 | 北京安天网络安全技术有限公司 | The network safety protection method and internet of things equipment of internet of things equipment |
| CN111327645A (en) * | 2018-11-28 | 2020-06-23 | 鸿合科技股份有限公司 | Network sharing method and device and electronic equipment |
| WO2020151030A1 (en) * | 2019-01-22 | 2020-07-30 | 网宿科技股份有限公司 | Method and apparatus for processing data message |
| CN112084494A (en) * | 2020-09-21 | 2020-12-15 | 百度在线网络技术（北京）有限公司 | Sensitive information detection method, device, equipment and storage medium |
| CN112769716A (en) * | 2021-01-12 | 2021-05-07 | 烽火通信科技股份有限公司 | Data forwarding method and device of virtual switch based on hybrid virtual network bridge |
| CN112953833A (en) * | 2021-03-25 | 2021-06-11 | 全讯汇聚网络科技（北京）有限公司 | Method, system and gateway equipment for realizing three-layer route forwarding based on network bridge |
| WO2021121123A1 (en) * | 2019-12-16 | 2021-06-24 | 中兴通讯股份有限公司 | Media stream distribution method, cdn node server, cdn system, and readable storage medium |
| CN115174206A (en) * | 2022-07-01 | 2022-10-11 | 江苏深网科技有限公司 | User mode application safety detection method and detection system under transparent network bridge mode |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110309184B (en) * | 2019-07-10 | 2021-05-25 | 中国民航信息网络股份有限公司 | Caching method and system for aviation freight rate data |
-
2007
- 2007-06-08 CN CNB2007101003312A patent/CN100558089C/en not_active Expired - Fee Related
Cited By (90)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9413547B2 (en) | 2005-05-03 | 2016-08-09 | Hewlett Packard Enterprise Development Lp | Open network connections |
| WO2009115002A1 (en) * | 2008-03-20 | 2009-09-24 | 成都市华为赛门铁克科技有限公司 | Method for buffering and forwarding data packets on a gateway device and the gateway device thereof |
| CN101252527B (en) * | 2008-04-09 | 2011-01-26 | 腾讯科技（深圳）有限公司 | Method for transferring network, network transfer server and inner core managing module |
| CN101582822A (en) * | 2008-05-14 | 2009-11-18 | 3柯姆公司 | Open network connection |
| CN101582822B (en) * | 2008-05-14 | 2014-10-29 | 惠普公司 | open network connection |
| CN101651672B (en) * | 2008-08-14 | 2012-12-19 | 鸿富锦精密工业（深圳）有限公司 | Network device and method for processing encapsulated packet |
| CN101345687B (en) * | 2008-08-21 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Method and system for packet transmission in Linux network bridge mode |
| CN101783786B (en) * | 2009-01-19 | 2013-01-16 | 中兴通讯股份有限公司 | Method and device for filtering data packets |
| CN101827070A (en) * | 2009-03-06 | 2010-09-08 | 英华达股份有限公司 | Portable communication device |
| CN101848190B (en) * | 2009-03-23 | 2012-08-08 | 北京鼎信高科信息技术有限公司 | Data packet matched processing method based on IP (Internet Protocol) address set and port set |
| CN101827102A (en) * | 2010-04-20 | 2010-09-08 | 中国人民解放军理工大学指挥自动化学院 | Data prevention method based on content filtering |
| CN101827102B (en) * | 2010-04-20 | 2013-01-30 | 中国人民解放军理工大学指挥自动化学院 | Data prevention method based on content filtering |
| WO2011150692A1 (en) * | 2010-06-02 | 2011-12-08 | 中兴通讯股份有限公司 | Method for controlling network access and service gateway thereof |
| CN101877704A (en) * | 2010-06-02 | 2010-11-03 | 中兴通讯股份有限公司 | Network access control method and service gateway |
| CN102480437A (en) * | 2010-11-23 | 2012-05-30 | 中兴通讯股份有限公司 | Method and device for controlling internet surfing data of home gateway |
| CN102098289B (en) * | 2010-12-17 | 2014-08-27 | 曙光信息产业股份有限公司 | Network security accessing and sealing method based on FPGA (field programmable gate array) |
| CN102098289A (en) * | 2010-12-17 | 2011-06-15 | 天津曙光计算机产业有限公司 | Network security accessing and sealing method based on FPGA (field programmable gate array) |
| CN102761517A (en) * | 2011-04-25 | 2012-10-31 | 工业和信息化部电信传输研究所 | Content reduction method for high-speed network |
| CN102761517B (en) * | 2011-04-25 | 2015-06-24 | 工业和信息化部电信传输研究所 | Content reduction method for high-speed network |
| CN102340428B (en) * | 2011-09-29 | 2014-01-15 | 哈尔滨安天科技股份有限公司 | URL (Uniform Resource Locator) detection and interception method and system based on network packet loss |
| CN102340428A (en) * | 2011-09-29 | 2012-02-01 | 哈尔滨安天科技股份有限公司 | URL (Uniform Resource Locator) detection and interception method and system based on network packet loss |
| CN104205727B (en) * | 2012-01-27 | 2019-08-30 | 诺基亚通信公司 | Session termination in mobile packet core network |
| CN104205727A (en) * | 2012-01-27 | 2014-12-10 | 诺基亚通信公司 | Session termination in a mobile packet core network |
| US10382360B2 (en) | 2012-01-27 | 2019-08-13 | Nokia Solutions And Networks Oy | Session termination in a mobile packet core network |
| CN102986194A (en) * | 2012-04-05 | 2013-03-20 | 华为技术有限公司 | Network security processing method, system, and network card |
| CN102986194B (en) * | 2012-04-05 | 2015-08-19 | 华为技术有限公司 | Network security processing method, system and network interface card |
| WO2012103846A3 (en) * | 2012-04-05 | 2013-03-07 | 华为技术有限公司 | Network security processing method, system, and network card |
| WO2012103846A2 (en) * | 2012-04-05 | 2012-08-09 | 华为技术有限公司 | Network security processing method, system, and network card |
| CN102695049A (en) * | 2012-05-09 | 2012-09-26 | 浙江宇视科技有限公司 | Transmission method and apparatus of code stream |
| CN102695049B (en) * | 2012-05-09 | 2015-06-10 | 浙江宇视科技有限公司 | Transmission method and apparatus of code stream |
| CN102821100B (en) * | 2012-07-25 | 2014-10-29 | 河南省信息中心 | Method for realizing streaming file system based on security gateway of network application layer |
| CN102821100A (en) * | 2012-07-25 | 2012-12-12 | 河南省信息中心 | Method for realizing streaming file system based on security gateway of network application layer |
| CN103001958A (en) * | 2012-11-27 | 2013-03-27 | 北京百度网讯科技有限公司 | Exception transmission control protocol (TCP) message processing method and device |
| CN103001958B (en) * | 2012-11-27 | 2016-03-16 | 北京百度网讯科技有限公司 | Abnormal T CP message processing method and device |
| CN103023914A (en) * | 2012-12-26 | 2013-04-03 | 北京神州绿盟信息安全科技股份有限公司 | Firewall system and implementation method thereof |
| CN103023914B (en) * | 2012-12-26 | 2015-07-01 | 北京神州绿盟信息安全科技股份有限公司 | Firewall system and implementation method thereof |
| CN103973476A (en) * | 2013-02-06 | 2014-08-06 | 上海杰之能信息科技有限公司 | Gateway, and gateway hot backup system and method |
| CN104184659A (en) * | 2013-05-22 | 2014-12-03 | 上海贝尔股份有限公司 | Method and device for obtaining data packet in network |
| CN104184659B (en) * | 2013-05-22 | 2017-08-25 | 上海贝尔股份有限公司 | A kind of method and apparatus for being used to obtain packet in network |
| CN104243107A (en) * | 2013-06-06 | 2014-12-24 | 深圳市腾讯计算机系统有限公司 | Data transmission method, device, terminal, server and system |
| CN104348656A (en) * | 2013-08-07 | 2015-02-11 | 中国移动通信集团北京有限公司 | Data acquisition method and device |
| CN103428216B (en) * | 2013-08-12 | 2016-12-28 | 深圳市吉祥腾达科技有限公司 | A kind of method and system improving fire wall performance |
| CN103428216A (en) * | 2013-08-12 | 2013-12-04 | 深圳市吉祥腾达科技有限公司 | Method and system for improving firewall performance |
| CN103414725A (en) * | 2013-08-21 | 2013-11-27 | 北京网秦天下科技有限公司 | Method and device used for detecting and filtering data message |
| WO2014180397A1 (en) * | 2013-12-16 | 2014-11-13 | 中兴通讯股份有限公司 | Network data packet sending method and device |
| CN103763150A (en) * | 2014-01-02 | 2014-04-30 | 中国人民解放军装甲兵工程学院 | Data acquisition system |
| CN103763150B (en) * | 2014-01-02 | 2017-09-22 | 中国人民解放军装甲兵工程学院 | Data collecting system |
| CN103929418A (en) * | 2014-03-28 | 2014-07-16 | 汉柏科技有限公司 | Wireless Internet access method and system based on network safety equipment |
| CN104202315A (en) * | 2014-08-25 | 2014-12-10 | 山东超越数控电子有限公司 | Network data package filtering method based on Power PC hardware frame |
| CN104468417A (en) * | 2014-12-16 | 2015-03-25 | 上海斐讯数据通信技术有限公司 | Stacking switch message transmission method and system and stacking switch |
| CN104468417B (en) * | 2014-12-16 | 2018-05-01 | 上海斐讯数据通信技术有限公司 | A kind of stacked switch message transmitting method, system and stacked switch |
| CN104796413A (en) * | 2015-04-02 | 2015-07-22 | 哈尔滨工程大学 | Grouping dynamic storage method facing Web firewall |
| CN104796413B (en) * | 2015-04-02 | 2018-04-24 | 哈尔滨工程大学 | A kind of packet dynamic storage method of web oriented fire wall |
| CN105162796A (en) * | 2015-09-24 | 2015-12-16 | 上海上讯信息技术股份有限公司 | Data transmission method and equipment |
| CN106454837A (en) * | 2016-08-25 | 2017-02-22 | 上海斐讯数据通信技术有限公司 | Access point switching device and switching method thereof |
| WO2018036218A1 (en) * | 2016-08-25 | 2018-03-01 | 上海斐讯数据通信技术有限公司 | Access point switching device and switching method therefor |
| CN107809377B (en) * | 2016-09-09 | 2021-06-08 | 卡斯柯信号有限公司 | Device and method for realizing universal gateway |
| CN106487945A (en) * | 2016-09-09 | 2017-03-08 | 中国互联网络信息中心 | A kind of DNS forwarding inquiries method |
| CN106487945B (en) * | 2016-09-09 | 2019-05-17 | 中国互联网络信息中心 | A kind of DNS forwarding inquiries method |
| CN107809377A (en) * | 2016-09-09 | 2018-03-16 | 卡斯柯信号有限公司 | The realization device and method of a kind of universal gateway |
| CN106487797A (en) * | 2016-10-25 | 2017-03-08 | 腾讯科技（深圳）有限公司 | A kind of network data processing method and system |
| CN106649036B (en) * | 2016-11-24 | 2019-03-12 | 北京瑞星网安技术股份有限公司 | Linux network access monitoring method and device |
| CN106649036A (en) * | 2016-11-24 | 2017-05-10 | 北京瑞星信息技术股份有限公司 | Method and device for Linux network access monitoring |
| CN106850565B (en) * | 2016-12-29 | 2019-06-18 | 河北远东通信系统工程有限公司 | A kind of network data transmission method of high speed |
| CN106850565A (en) * | 2016-12-29 | 2017-06-13 | 河北远东通信系统工程有限公司 | A kind of network data transmission method of high speed |
| CN109298931B (en) * | 2017-07-25 | 2022-04-08 | 迈普通信技术股份有限公司 | Buffer on-demand release method and network equipment |
| CN109298931A (en) * | 2017-07-25 | 2019-02-01 | 迈普通信技术股份有限公司 | The on-demand method for releasing in buffer area and the network equipment |
| CN107659511A (en) * | 2017-08-16 | 2018-02-02 | 华为技术有限公司 | A kind of overload controlling method, main frame and storage medium and program product |
| CN107395619B (en) * | 2017-08-17 | 2020-03-17 | 深圳市盛路物联通讯技术有限公司 | Secure communication method and system |
| CN107395619A (en) * | 2017-08-17 | 2017-11-24 | 深圳市盛路物联通讯技术有限公司 | A kind of safety communicating method and system |
| CN107633380A (en) * | 2017-08-30 | 2018-01-26 | 北京明朝万达科技股份有限公司 | The task measures and procedures for the examination and approval and system of a kind of anti-data-leakage system |
| CN109510795A (en) * | 2017-09-14 | 2019-03-22 | 蓝盾信息安全技术股份有限公司 | A kind of intelligent DDOS defense technique based on isolated device |
| CN109951425B (en) * | 2017-12-21 | 2021-03-23 | 张家界航空工业职业技术学院 | TCP (Transmission control protocol) flow state integrity detection method based on FPGA (field programmable Gate array) |
| CN109951425A (en) * | 2017-12-21 | 2019-06-28 | 张家界航空工业职业技术学院 | TCP flow state integrity detection method based on FPGA |
| CN109962885A (en) * | 2017-12-22 | 2019-07-02 | 北京安天网络安全技术有限公司 | The network safety protection method and internet of things equipment of internet of things equipment |
| CN108200026A (en) * | 2017-12-27 | 2018-06-22 | 山东华软金盾软件股份有限公司 | The method that rst blocking packets are sent based on ipv6 |
| CN108965061A (en) * | 2018-08-03 | 2018-12-07 | 上海欣诺通信技术股份有限公司 | Packet capture device and method, reduction apparatus and method, system and medium |
| CN108965061B (en) * | 2018-08-03 | 2024-02-02 | 上海欣诺通信技术股份有限公司 | Data packet capturing device and method, restoring device and method, system and medium |
| CN111327645B (en) * | 2018-11-28 | 2023-11-21 | 鸿合科技股份有限公司 | Network sharing method and device and electronic equipment |
| CN111327645A (en) * | 2018-11-28 | 2020-06-23 | 鸿合科技股份有限公司 | Network sharing method and device and electronic equipment |
| CN109587082B (en) * | 2019-01-10 | 2020-12-29 | 烽火通信科技股份有限公司 | Message asynchronous forwarding system and method based on Linux operating system |
| CN109587082A (en) * | 2019-01-10 | 2019-04-05 | 烽火通信科技股份有限公司 | A kind of asynchronous repeater system of message based on (SuSE) Linux OS and method |
| WO2020151030A1 (en) * | 2019-01-22 | 2020-07-30 | 网宿科技股份有限公司 | Method and apparatus for processing data message |
| WO2021121123A1 (en) * | 2019-12-16 | 2021-06-24 | 中兴通讯股份有限公司 | Media stream distribution method, cdn node server, cdn system, and readable storage medium |
| CN112084494A (en) * | 2020-09-21 | 2020-12-15 | 百度在线网络技术（北京）有限公司 | Sensitive information detection method, device, equipment and storage medium |
| CN112769716A (en) * | 2021-01-12 | 2021-05-07 | 烽火通信科技股份有限公司 | Data forwarding method and device of virtual switch based on hybrid virtual network bridge |
| CN112953833B (en) * | 2021-03-25 | 2022-04-15 | 全讯汇聚网络科技（北京）有限公司 | Method, system and gateway equipment for realizing three-layer route forwarding based on network bridge |
| CN112953833A (en) * | 2021-03-25 | 2021-06-11 | 全讯汇聚网络科技（北京）有限公司 | Method, system and gateway equipment for realizing three-layer route forwarding based on network bridge |
| CN115174206A (en) * | 2022-07-01 | 2022-10-11 | 江苏深网科技有限公司 | User mode application safety detection method and detection system under transparent network bridge mode |
| CN115174206B (en) * | 2022-07-01 | 2024-04-02 | 江苏深网科技有限公司 | User mode application security detection method and detection system in transparent network bridge mode |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100558089C (en) | 2009-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100558089C (en) | A kind of content filtering gateway implementation method of filter Network Based | |
| US7486673B2 (en) | Method and system for reassembling packets prior to searching | |
| JP4743894B2 (en) | Method and apparatus for improving security while transmitting data packets | |
| CN101036369B (en) | Offline analysis of packets | |
| US9009830B2 (en) | Inline intrusion detection | |
| US8769681B1 (en) | Methods and system for DMA based distributed denial of service protection | |
| CN1836245A (en) | Integrated circuit apparatus and method for high throughput signature based network applications | |
| CN101083563A (en) | Method and apparatus for preventing distributed refuse service attack | |
| CN101465855B (en) | Method and system for filtrating synchronous extensive aggression | |
| CN100454895C (en) | Method for raising network security via message processing | |
| CN101460983A (en) | Malicious attack detection system and an associated method of use | |
| JP4774307B2 (en) | Unauthorized access monitoring device and packet relay device | |
| CN102067532A (en) | Processing of packet fragments | |
| CN1822593A (en) | Network safety protective method for preventing reject service attack event | |
| CN101056306A (en) | Network device and its access control method | |
| TWI360978B (en) | Network message processing using inverse pattern m | |
| CN111797371A (en) | Switch encryption system | |
| KR20050002604A (en) | System and method for message-based scalable data transport | |
| CN1741504A (en) | Flow controlling method based on application and network equipment for making applied flow control | |
| CN1992595A (en) | Terminal and related computer implemented method for detecting malicious data for computer network | |
| CN1741473A (en) | A network data packet availability deciding method and system | |
| CN1567900A (en) | A method for implementing message forwarding control in routing equipment | |
| CN101582880B (en) | Method and system for filtering messages based on audited object | |
| CN106790310A (en) | Distributed denial of service attack protects the method and system integrated with load balancing | |
| CN1291567C (en) | A high-performance multi-service network security processing equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091104 Termination date: 20110608 |