WIRELESS ROUTER REMOTE FIRMWARE UPGRADE

• US 20130013907A1
• Filed: 08/16/2012
• Published: 01/10/2013
• Est. Priority Date: 02/15/2005
• Status: Active Grant

• Current Assignee: Elisa Sartori
• Original Assignee: Gytheion Networks LLC
• Inventors: Marino, Joseph P., Fortin, Jonathan
• Granted Patent: US 8,402,109 B2
• Time in Patent Office: Days
• US Class Current: 713/2
• CPC Class Codes: G06F 21/305 by remotely controlling device operation
• CPC Class Codes: G06F 21/56 Computer malware detection or handling, e.g. anti-virus arrangements
• CPC Class Codes: G06F 21/57 Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
• CPC Class Codes: G06Q 10/00 Administration; Management
• CPC Class Codes: H04L 45/563 Software download or update
• CPC Class Codes: H04L 51/063 Content adaptation, e.g. replacement of unsuitable content
• CPC Class Codes: H04L 51/212 using filtering or selective blocking
• CPC Class Codes: H04L 67/34 involving the movement of software or configuration parameters network booting or remote initial program loading [RIPL] G06F9/4416

Abstract

A wireless router receives a firmware update from a remote server, and destructively overwrites router firmware in flash memory in a chunk-wise manner, and then writes a kernel memory before going live with upgraded firmware. Some routers authenticate the firmware image. In some cases, image chunks are re-ordered into an executable order after receipt and before finishing their final arrangement in the flash memory. In some routers, a maximum firmware image size is at least two chunk sizes smaller than the flash memory storage capacity. Some routers remap ROM to RAM memory. Some decompress data from flash into a RAM. Some save text file configuration settings in flash before rebooting. Some detect a user'"'"'s inactive billing status and redirect a web browser to a billing activation page.

Claims

1. A method for upgrading a wireless router, comprising the steps of:

(a) containing a firmware version, namely, a flash memory in the wireless router containing a first version of router firmware, the router firmware including instructions to be executed by a processor of the wireless router, the router firmware also including data;

(b) remotely requesting a firmware update, namely, the wireless router sending a request for a firmware update, the request being sent from the wireless router over a network connection toward a server;

(c) receiving a responsive firmware image, namely, the wireless router receiving over the network connection a response to the request for a firmware update, the response including at least a firmware image for a second version of router firmware which differs from the first version of router firmware by reason of containing at least one firmware change, a firmware change being a difference in firmware data and/or a difference in firmware instructions, the firmware image including a plurality of chunks, each chunk having a size which is no greater than a predetermined chunk size;

(d) destructively overwriting flash memory chunks, namely, the wireless router destructively overwriting the first version of router firmware in the flash memory with the second version of router firmware, the destructive overwriting proceeding in a chunk-wise manner such that prior to being overwritten by all of the chunks the flash memory contains neither a complete copy of the first version nor a complete copy of the second version of the router firmware, and wherein the wireless router is configured to run whatever version of router firmware is in the router'"'"'s flash memory after being rebooted; and

(e) going live with upgraded firmware, namely, the wireless router rebooting, thereby making the firmware change(s) go live.

2. The wireless router upgrading method of claim 1, further comprising writing the flash memory and then writing a kernel memory, namely, the wireless router destructively overwriting the first version of router firmware in the flash memory with the second version of router firmware, and then writing a copy of content of the second version of router firmware to a kernel memory in a volatile RAM memory in the wireless router before going live with upgraded firmware.

3. The wireless router upgrading method of claim 1, further comprising writing both flash memory and a volatile RAM disk, namely, the wireless router destructively overwriting the first version of router firmware in the flash memory with the second version of router firmware, and also writing a copy of content of the second version of router firmware to a RAM disk in a volatile RAM memory of the router.

4. The wireless router upgrading method of claim 1, wherein the firmware image chunks have at least one predetermined executable order, namely, an order in which the chunks are arranged in an executable copy of the firmware image, wherein the step of receiving a responsive firmware image receives the chunks in a volatile RAM memory in the wireless router in an order which differs from the executable order, and wherein the method comprises re-ordering the chunks such that the step of destructively overwriting flash memory chunks arranges chunks in the flash memory in the executable order.

5. The wireless router upgrading method of claim 1, wherein the firmware image has a size and the flash memory has a storage capacity, and the method further comprises the step of the wireless router checking to see whether the size of the firmware image is less than a predetermined maximum firmware image size, and the predetermined maximum firmware image size is at least two chunk sizes smaller than the flash memory storage capacity.

6. The wireless router upgrading method of claim 1, further comprising the step of the wireless router remapping a ROM memory address in the router to a RAM memory address in the router.

7. The wireless router upgrading method of claim 1, further comprising the step of the wireless router decompressing data held within the flash memory in the router and copying the data to a RAM-based file system in the router.

8. The wireless router upgrading method of claim 1, further comprising the steps of:

before going live with upgraded firmware, the wireless router overwriting at least a portion of the flash memory with user-definable configuration settings from a text file; and

after going live with upgraded firmware, the wireless router overwriting the text file with the configuration settings from the flash memory.

9. The wireless router upgrading method of claim 1, wherein the response includes an indication that a billing status is inactive, and the method further comprises redirecting a web browser to a billing activation page.

10. The wireless router upgrading method of claim 1, wherein the firmware image chunks have at least one predetermined executable order, namely, an order in which the chunks are arranged in an executable copy of the firmware image, wherein the step of receiving a responsive firmware image receives the chunks in the wireless router in an order which differs from the executable order, and the method comprises re-ordering the chunks such that the step of destructively overwriting flash memory chunks arranges chunks in the flash memory in the executable order, and the method also comprises writing a copy of the chunks to a kernel memory in the wireless router.

11. A remotely upgradable wireless router, comprising:

a processor;

a volatile RAM memory in operable communication with the processor and containing a kernel, the kernel including data and including instructions which upon execution by the processor at least partially control operation of the wireless router, the kernel in particular containing a flash memory device driver;

a network interface card connectable to a TCP/IP network for two-way data communication of the wireless router with a remote server, the network interface card in operable communication with the volatile RAM memory;

a wireless link interface connectable to a wireless network for two-way data communication of the wireless router with a local computer, the wireless link interface in operable communication with the volatile RAM memory;

a flash memory in operable communication with the processor by use of the flash memory device driver, the flash memory containing a version of wireless router firmware, the wireless router firmware including data and including instructions which upon execution by the processor at least partially control operation of the wireless link interface;

the wireless router further characterized in that upon execution of at least some of the instructions by the processor, the wireless router will do the following;

receive over the network interface from the remote server a wireless router firmware image,

write content of the wireless router firmware image to the flash memory,

write content of the wireless router firmware image to the kernel memory after writing the content to the flash memory, and then

reboot, thereby passing control to at least some of the wireless router firmware content that was written to the flash memory.

12. The remotely upgradable wireless router of claim 11, wherein the flash memory has a storage capacity, and the wireless router firmware image includes a plurality of chunks, each chunk having a size which is no greater than a predetermined chunk size and is less than one-eighth the flash memory storage capacity, and wherein the wireless router upon execution of at least some of the instructions by the processor destructively overwrites the version of wireless router firmware in the flash memory in a chunk-wise manner with chunks of the wireless router firmware image.

13. The remotely upgradable wireless router of claim 11, wherein the wireless router firmware image includes a plurality of chunks which have at least one predetermined executable order, namely, an order in which the chunks are arranged in an executable copy of the wireless router firmware image, and wherein the wireless router upon execution of at least some of the instructions by the processor receives the chunks in the RAM memory in an order which differs from the executable order, and re-orders chunks to arrange the chunks in the flash memory in the executable order.

14. The remotely upgradable wireless router of claim 11, further comprising a ROM memory address remapped to a RAM memory address in the router.

15. A system comprising the remotely upgradable wireless router of claim 11 and a text file containing user-defined configuration settings, wherein the flash memory contains a copy of the user-defined configuration settings.

16. The remotely upgradable wireless router of claim 11, wherein the wireless router firmware image has a size and the flash memory has a storage capacity, the wireless router firmware image includes a plurality of chunks, each chunk has a size which is no greater than a predetermined chunk size and is less than one-eighth the flash memory storage capacity, and the size of the wireless router firmware image is at least two chunk sizes smaller than the flash memory storage capacity.

17. The remotely upgradable wireless router of claim 11, wherein the wireless router upon execution of at least some of the instructions by the processor performs authentication to verify validity of the wireless router firmware image.

18. The remotely upgradable wireless router of claim 11, wherein the wireless link interface conforms with at least one 802.11 standard for wireless communications.

19. The remotely upgradable wireless router of claim 11, further comprising a 10/100 Mbps local area network interface card to provide a data communication connection to a local area network, the kernel including instructions which upon execution by the processor at least partially control operation of the local area network interface card.

20. The remotely upgradable wireless router of claim 11, wherein the kernel comprises open source operating system code.