c - Set wireless channel using netlink API -


I am developing a WiFi device in Ubuntu Linux 12.04 environment and let me switch the WiFi interface between different channels. the wanted.

Currently I found the solution in Warshark source code ws80211_utils.c function ws80211_set_freq but I do not know what it is to implement how my source code and include what libc and how to compile So that I can test it.

The problem is that you have a lot of logic and flags to use. Also, this is the first time I develop a netlink wifi device.

If there is a good manual available, where to start for WiFi and how to use it, provide me a link.

Thank you very much!

In the current Linux versions, "The right way to talk" is to keep in mind that for the wireless subsystem, Can not set arbitrarily a channel with each driver and every operating mode (master, client, monitor etc). Some drivers can change the channel only if the related interface is "down". In a mode such as a client ("managed"), the channel can not be set exactly as it is defined by the access point.

Also note that all wireless device drivers do not use Mac 80211 / cfg80211. To not use those drivers, you must either use the old wireless extension API or (worse) a driver-specific proprietary API.

Unfortunately, no up-to-date and full Nl80211 interface documentation. Please correct me if I am wrong!

Your approach to seeing other programs in the source code seems appropriately. You can also use the iw option to set the channel: 

  $ iw --help Usage: iw [options] Command options: --debug Enable netlink debugging --version show version (3.2) command: ... Dev & lt; Devname & gt; Set up channel & lt; Channel & gt; [HT20 | HT40 + | HT40-] ...

In iw s, line 91ff you can find the code when iw wlan0 set channel implemented is done. However, this code is definitely not easy to read. It seems that there is a path to the NL80211_ATTR_WIPHY_FREQ attribute in combination with the NL80211_CMD_SET_WIPHY command.

You can use the nl80211 to find a skeleton program. In addition, code for aircrack-ng (, function linux_set_channel_nl80211 ) can serve as a template.


Comments

Post a Comment

Popular posts from this blog

ios - How do I use CFArrayRef in Swift? -

I am using Objective-class in my Swift Project through a bridging header. The method signature looks like this: - Some cement (some type) some parameters; I started by getting an example of class, calling method, and storing the value: var myInstance = MyClassWithThatMethod (); Var cfArr = myInstance.someMethod (some value); Then try to get the value in the array: var valueInArrayThatIWant = CFArrayGetValueAtIndex (cfArr, 0); However, I get the error unmanaged & lt; Cfarray & gt; Not like 'CFArray' . Unmanaged & lt; Cfarray & gt; also means? I looked, but I do not need to change the array in a fast array (though it would be good). I need to be able to get value from the array. I also tried CFArray method to pass in a function: func doSomeStuffOnArray (myArray: NSArray) {} Although I get the same error when using: doSomeStuffOnArray (cfArr); // unmanaged & lt; CFArray & gt; I am using CFArray because I want to sto...
Read more

eclipse plugin - Run java code error: Workspace is closed -

To create an automated project, I created a plug-in project with the following dependencies: Org.eclipse.core.resources org.eclipse.equinox.registry org.eclipse.core.runtime and the following The Java class is located in the src folder: Package Examiner; Import org.eclipse.core.resources.IProject; Import org.eclipse.core.resources.IWorkspaceRoot; Import org.eclipse.core.resources.ResourcesPlugin; Import org.eclipse.core.runtime.CoreException; Import org.eclipse.core.runtime.IProgressMonitor; Import org.eclipse.core.runtime.NullProgressMonitor; Public class tes {public static zero main (string [] args) {// TODO auto generated method stub IProgressMonitor progress monitor = new NullProgressMonitor (); IWorkspaceRoot root = ResourcesPlugin.getWorkspace (). GetRoot (); Ipoject project = root.jetproject ("desired projectname"); Try {Project.create (progress monitor); Project.open (progressMonitor); } Grip (CoreException E) {// TODO Auto generated blocking block e....
Read more

c - Error on building source code in VC 6 -

When I create my project in VC6, the BScMKE reports the following error Linking .. Creating Library ... .. / ... / PB / Bean / Debub / ICEERP.Lib and Object ........ P.B. / Bean / DBube / ICREPlay.APP Browse information file ... BSMMK: ​​error can not be read from BK 1505: file '../../PB/bin/TmpOut/ICReplay/Debug/ICReplay_PB.bsc' Error executing bscmake.exe Can someone help me? 2 Reason for reference from: "ICReplay_PB .bsc "file will be corrupted The trunk of the file will be happening with the compiler running out of disk space or is being interrupted when creating .sbr file I think this answer will help you!
Read more