ralphy wrote: > The wireless extensions version is 22. Thank you for that, I thought I had come across the definition in the past, but couldn't remember where.
There's nothing better than a hard fact, which you have (kindly) provided, to spoil a perfectly good tale ! It turns out that our -ar6000.ko- seems to have chosen to increment the SSID length it is provided, by one. Not just for its own use, mind, it increments the length in the data buffer provided by the originating -SIOCSIWESSID- ioctl call. That (now changed) data buffer then informs the kernel's subsequent -wireless_send_event- event notification. And if the SSID was 32 bytes long, well, it now appears to have been 33 bytes long. I shall add that the kernel's -ioctl_standard_call- is also capable of tinkering with the SSID length in some circumstances, but seems to be capable of cleaning up after itself... (-net/wireless/wext.c-). I found one sample of an AR6000 driver source code that appeared to display this behaviour, and several that did not. Never mind that the sample I found is apparently for an AR6003, and Linux v3.3. The fact that one driver source appears to have done it suggests that others might have done it. That sample carefully increments the length if -WIRELESS_EXT > 20-, presumably because it knows, I suppose, that -wpa_supplicant- and friends will have taken care _not_ to increment the length in this circumstance. Ho hum. (File wireless_ext.c at: http://dl.linux-sunxi.org/SDK/A20/A20_SDK_20130319/lichee/linux-3.3/modules/wifi/ar6003/AR6kSDK.build_3.1_RC.514/host/os/linux/ But not worth examining. ) A little peek inside our -ar6000.ko- seems to reveal the same behaviour. There is always room for misinterpretation/error... Anyway, we can legitimately "squash" the kernel complaint by simply restricting the "random SSID" to 31 bytes in length, not 32, so my tale still contains a kernel of truth. ------------------------------------------------------------------------ mrw's Profile: http://forums.slimdevices.com/member.php?userid=38299 View this thread: http://forums.slimdevices.com/showthread.php?t=111663 _______________________________________________ Radio mailing list Radio@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/radio
