- 802.11D ENABLE OR DISABLE DRIVERS
- 802.11D ENABLE OR DISABLE UPDATE
- 802.11D ENABLE OR DISABLE MANUAL
- 802.11D ENABLE OR DISABLE PATCH
- 802.11D ENABLE OR DISABLE CODE
802.11D ENABLE OR DISABLE DRIVERS
In this section we cover how will be using CRDA on our wireless subsystem in Linux and how it will work for the different types of drivers we have. Git:///pub/scm/linux/kernel/git/mcgrof/crda.git
802.11D ENABLE OR DISABLE PATCH
Write the userspace agent the kernel will communicate withĪ first patch for RFC has been posted, follows are expected soon.The userspace agent components of parsing a db.txt, implementing RSA digital signature support and defining a file format are all complete. When the file is loaded by the regulatory daemon the signature is checked against a list of public keys built into the regulatory daemon binary.
Integrity of the binary regulatory file is ensured by digitally signing the regulatory data using a private key and embedding the signature into the binary file. The file format is defined in the regdb.h header file. We define a new custom binary file format for use with CRDA, to have the data available quickly and as compact as possible as well as allowing to distribute the data along with the digital signature (see below) as easily as possible. The diagram below best illustrates the current design of using CRDA:īelow is an example of a country entry for the db.txt regulatory file for AR (Argentina). | Max TX power (+/- dBm) | Pad (if needed) | | First channel number | Number of channels | | Number of channels | Max TX power (+/- dBm) | | Indoor/Outdoor/Both | First channel number | The 802.11d Country IE has the following format: The Country Information Element contains the information required to allow a station to identify the regulatory domain in which the station is located and to configure its PHY for operation in that regulatory domain. A secondary benefit of the mechanism described in this amendment is the ability for an IEEE Std 802.11 moble station to roam between regulatory domains. This mechanism is applicable to all IEEE Std 802.11 PHY types. These extensions provide a mechanism for an IEEE Std 802.11 access point to deliver the required radio transmitter parameters to an IEEE Std 802.11 mobile station, which allows that station to configure its radio to operate within the applicable regulations of a geographic or political subdivision.
Specifies the extensions to IEEE Std 802.11 for Wireless Local Area Networks providing specifications for conformant operation beyond the original six regulatory domains of that standard. For drivers without any regulatory information from the EEPROM it is the complete regulatory solution. For these type of drivers CRDA provides an extra layer of regulatory compliance. We ensure drivers can keep relying on these internal techniques by using a notifier chain to inform the drivers upon regulatory domain change so they themselves can review the regulatory information set by basing it on their EEPROM data. Some drivers rely on some readings from the EEPROM for enforcement or calibration and this is done through different techniques. Once the kernel has this one regulatory domain the wireless subsystem can decide how it wants to use this information.Īlthough CRDA can be seen as a complete regulatory solution for some Linux drivers it actually is not the only component which will be relied upon to help with regulatory restrictions.
802.11D ENABLE OR DISABLE CODE
We use an alpha2 country code as that is the same string used by the 802.11d country information element for country localization. The userspace agent can then be triggered to upload to the kernel one regulatory domain for a specific ISO-3166 alpha2 country string. Integrity of the file is ensured by CRDA by verifying the RSA digital signature of the database. The database is ultimately converted to binary form using a new binary file format designed for size efficiency, integrity checking and to allow upgrades without updates of the kernel. Keeping the database in userspace allows distributions to provide updates without kernel upgrades.
802.11D ENABLE OR DISABLE UPDATE
This is achieved by working with the community on a thorough and flexible regulatory database which is maintained in userspace and providing a userspace agent which can be triggered to update the kernel's wireless core with one regulatory domain for a specific country. Drivers with EEPROM regulatory informationĬRDA is a FOSS project to solve the problem of lack of support by wireless vendors due to regulatory considerations by dealing with regulatory considerations directly through the wireless subsystem.Drivers with no EEPROM regulatory information.
802.11D ENABLE OR DISABLE MANUAL