On Fri, Sep 11, 2009 at 8:36 PM, Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx> wrote: > On Fri, Sep 11, 2009 at 5:27 AM, Holger Schurig > <hs4233@xxxxxxxxxxxxxxxxxxxx> wrote: >> Hi ! >> >> I'm playing with regulatory domain using wireless-testing, iw, >> crda and ath5 on Debian. Here are some observations: >> >> 1) Debian sucks here > > We've tried a few times to poke them and after some thread exchanges > and some changes to wirless-regdb and crda due to concerns over the > signing stuff due to the DFSG in account for these discussions it > seems some stuff was packaged but not sure where it went. Kel, are you > aware of the status in this regard on Debian? Well, if the problem is signing, then they are always free to package a patched crda that accepts unsigned or self-signed databases; AFAIK GPL doesn't prohibit that (though it kinda defeats the purpose of crda). > > [1] http://lists.alioth.debian.org/pipermail/pkg-wpa-devel/2009-May/002267.html > >> 2) I remove CONFIG_WIRELESS_OLD_REGULATORY. Then, after inserting >> the card, I see in "iw list": >> >> * 2412 MHz [1] (20.0 dBm) >> * 2417 MHz [2] (20.0 dBm) >> * 2422 MHz [3] (20.0 dBm) >> * 2427 MHz [4] (20.0 dBm) >> * 2432 MHz [5] (20.0 dBm) >> * 2437 MHz [6] (20.0 dBm) >> * 2442 MHz [7] (20.0 dBm) >> * 2447 MHz [8] (20.0 dBm) >> * 2452 MHz [9] (20.0 dBm) >> * 2457 MHz [10] (20.0 dBm) >> * 2462 MHz [11] (20.0 dBm) >> * 2467 MHz [12] (20.0 dBm) (passive scanning) >> * 2472 MHz [13] (20.0 dBm) (passive scanning) >> * 2484 MHz [14] (20.0 dBm) (passive scanning) >> >> I'd like to highlight the "passive scanning". Is this info >> from the card EEPROM? > > If you lack crda, by default you will world roam, even if your EEPROM > has been programmed to a specific regulatory domain and calibrated as > such -- reason being is we moved regulatory content to userspace; so > OLD_REG had only 3 statically built regulatory domains in the kernel, > with CRDA you get all of them on userspace, and no more need to update > the kernel to update regulatory settings. World roaming has some > enhancements though like enabling active scanning on passive-scanning > channels if youo pick up a beacon from an AP on that channel. > >> 3) After "iw reg set DE" (for germany), it's now >> >> 2412 MHz [1] (20.0 dBm) >> 2417 MHz [2] (20.0 dBm) >> 2422 MHz [3] (20.0 dBm) >> 2427 MHz [4] (20.0 dBm) >> 2432 MHz [5] (20.0 dBm) >> 2437 MHz [6] (20.0 dBm) >> 2442 MHz [7] (20.0 dBm) >> 2447 MHz [8] (20.0 dBm) >> 2452 MHz [9] (20.0 dBm) >> 2457 MHz [10] (20.0 dBm) >> 2462 MHz [11] (20.0 dBm) >> 2467 MHz [12] (20.0 dBm) (passive scanning) >> 2472 MHz [13] (20.0 dBm) (passive scanning) >> 2484 MHz [14] (disabled) >> >> Great, CRDA worked obviously: channel 14 has been disabled. > > Sure, but keep in mind your regulatory domain must've been read too > first, that's probably what lifted your passive scan flag on channel > 12 unless you did a scan prior to trying to set the regulatory domain. > >> And, as I understand it, CRDA can just limit settings >> further, not widening it. Therefore channels 12 and 13 >> are still marked as "passive scanning". > > Right. Now if your card is world roaming (defined in > net/wireless/reg.c as reg_is_world_roaming() ) you could lift passive > scan off of 12 and 13 if you had an AP there. > >> If I want to get them to "active scanning", would I need to >> modify the EEPROM of the card? > > Well yes, but you must note that is something not supported, not > recommended, unless you are a manufacturer selling cards and have the > capability to calibrate, etc, and certify. That is -- EEPROM > programming is not something designed to be changed by the end user. > >> ath_info says "Reg. Domain: >> 0x60". > > Ok, as I have documented on the ath wiki page [1] any Atheros > regulatory domain which has 0x60 is world roaming. As I also > documented as well these 12 world regulatory domains are statically > built into the kernel on ath as they are custom world regulatory > domains, so even without the presence of CRDA you'll get the > regulatory domain your card is designed for. With OLD_REG though you > end up trying to stick to static kenrel US rules so you would only be > allowed to use what the US allows on your 0x60 regulatory domain, this > is ath_world_regdom_60_61_62 on drivers/net/wireless/ath/regd.c. > > [1] http://wireless.kernel.org/en/users/Drivers/ath > > Luis > -- > To unsubscribe from this list: send the line "unsubscribe linux-wireless" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Vista: [V]iruses, [I]ntruders, [S]pyware, [T]rojans and [A]dware. :-) -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
