Regulatory/CRDA Race

Regulatory/CRDA Race

[Mark Mentovai]

Following up on the old-ish “[ath5k-devel] Race condition in CRDA calls?” thread…

I independently experienced this problem, debugged it, and came to the same conclusion. There is in fact a race between regulatory requests being made via regulatory_hint and CRDA actually updating regulatory data. I see this on a system with two cards that come up one after the other during boot.

1. cfg80211 calls CRDA to update the world regulatory domain and CRDA does so. The regulatory domain is now 00.

2. The first card’s driver (in my case, ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request decides against intersection because the last request came from the core. There’s a CRDA call, but CRDA isn’t quick enough to respond. The regulatory domain is still 00, because CRDA hasn’t changed it yet.

3. The second card’s driver (also ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request sees that the last request came from a driver (instead of the core) and since the regulatory domain is changing from 00 to US, decides that intersection must be performed.

4. When CRDA finally responds to the request from #2 or #3, cfg80211 sees that last_request->intersect is true, and intersects. The regulatory domain is set to the intersection of 00 and US.

The race here is between CRDA providing data and the second card’s request being made via regulatory_hint. regulatory_hint and ignore_request assume that last_request is in sync with the currently-set regulatory domain, but there is no such synchronization.

Here’s my openwrt-devel post describing the above in a slightly different level of detail:https://lists.openwrt.org/pipermail/openwrt-devel/2010-November/008570.html.

Re: Regulatory/CRDA Race

[Luis R. Rodriguez]

On Mon, Nov 8, 2010 at 11:40 AM, Mark Mentovai <mark@moxienet.com> wrote:
> Following up on the old-ish “[ath5k-devel] Race condition in CRDA calls?” thread…
>
> I independently experienced this problem, debugged it, and came to the same conclusion. There is in fact a race between regulatory requests being made via regulatory_hint and CRDA actually updating regulatory data. I see this on a system with two cards that come up one after the other during boot.
>
> 1. cfg80211 calls CRDA to update the world regulatory domain and CRDA does so. The regulatory domain is now 00.
>
> 2. The first card’s driver (in my case, ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request decides against intersection because the last request came from the core. There’s a CRDA call, but CRDA isn’t quick enough to respond. The regulatory domain is still 00, because CRDA hasn’t changed it yet.
>
> 3. The second card’s driver (also ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request sees that the last request came from a driver (instead of the core) and since the regulatory domain is changing from 00 to US, decides that intersection must be performed.
>
> 4. When CRDA finally responds to the request from #2 or #3, cfg80211 sees that last_request->intersect is true, and intersects. The regulatory domain is set to the intersection of 00 and US.
>
> The race here is between CRDA providing data and the second card’s request being made via regulatory_hint. regulatory_hint and ignore_request assume that last_request is in sync with the currently-set regulatory domain, but there is no such synchronization.
>
> Here’s my openwrt-devel post describing the above in a slightly different level of detail:https://lists.openwrt.org/pipermail/openwrt-devel/2010-November/008570.html.--

I'll take a look at this once I get done with the
compat-wireless-2.6.37 release. Thanks for the report.

  Luis

Re: Regulatory/CRDA Race

[Luis R. Rodriguez]

On Tue, Nov 9, 2010 at 1:19 PM, Luis R. Rodriguez <mcgrof@gmail.com> wrote:
> On Mon, Nov 8, 2010 at 11:40 AM, Mark Mentovai <mark@moxienet.com> wrote:
>> Following up on the old-ish “[ath5k-devel] Race condition in CRDA calls?” thread…
>>
>> I independently experienced this problem, debugged it, and came to the same conclusion. There is in fact a race between regulatory requests being made via regulatory_hint and CRDA actually updating regulatory data. I see this on a system with two cards that come up one after the other during boot.
>>
>> 1. cfg80211 calls CRDA to update the world regulatory domain and CRDA does so. The regulatory domain is now 00.
>>
>> 2. The first card’s driver (in my case, ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request decides against intersection because the last request came from the core. There’s a CRDA call, but CRDA isn’t quick enough to respond. The regulatory domain is still 00, because CRDA hasn’t changed it yet.
>>
>> 3. The second card’s driver (also ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request sees that the last request came from a driver (instead of the core) and since the regulatory domain is changing from 00 to US, decides that intersection must be performed.
>>
>> 4. When CRDA finally responds to the request from #2 or #3, cfg80211 sees that last_request->intersect is true, and intersects. The regulatory domain is set to the intersection of 00 and US.
>>
>> The race here is between CRDA providing data and the second card’s request being made via regulatory_hint. regulatory_hint and ignore_request assume that last_request is in sync with the currently-set regulatory domain, but there is no such synchronization.
>>
>> Here’s my openwrt-devel post describing the above in a slightly different level of detail:https://lists.openwrt.org/pipermail/openwrt-devel/2010-November/008570.html.--
>
> I'll take a look at this once I get done with the
> compat-wireless-2.6.37 release. Thanks for the report.

I'm looking at this now, can you do me a favor and test against
today's wireless-testing to verify the issue is still present? I'll be
digging at this in the mean time.

  Luis

Re: Regulatory/CRDA Race

[Luis R. Rodriguez]

On Thu, Nov 11, 2010 at 3:36 PM, Luis R. Rodriguez <mcgrof@gmail.com> wrote:
> On Tue, Nov 9, 2010 at 1:19 PM, Luis R. Rodriguez <mcgrof@gmail.com> wrote:
>> On Mon, Nov 8, 2010 at 11:40 AM, Mark Mentovai <mark@moxienet.com> wrote:
>>> Following up on the old-ish “[ath5k-devel] Race condition in CRDA calls?” thread…
>>>
>>> I independently experienced this problem, debugged it, and came to the same conclusion. There is in fact a race between regulatory requests being made via regulatory_hint and CRDA actually updating regulatory data. I see this on a system with two cards that come up one after the other during boot.
>>>
>>> 1. cfg80211 calls CRDA to update the world regulatory domain and CRDA does so. The regulatory domain is now 00.
>>>
>>> 2. The first card’s driver (in my case, ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request decides against intersection because the last request came from the core. There’s a CRDA call, but CRDA isn’t quick enough to respond. The regulatory domain is still 00, because CRDA hasn’t changed it yet.
>>>
>>> 3. The second card’s driver (also ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request sees that the last request came from a driver (instead of the core) and since the regulatory domain is changing from 00 to US, decides that intersection must be performed.
>>>
>>> 4. When CRDA finally responds to the request from #2 or #3, cfg80211 sees that last_request->intersect is true, and intersects. The regulatory domain is set to the intersection of 00 and US.
>>>
>>> The race here is between CRDA providing data and the second card’s request being made via regulatory_hint. regulatory_hint and ignore_request assume that last_request is in sync with the currently-set regulatory domain, but there is no such synchronization.
>>>
>>> Here’s my openwrt-devel post describing the above in a slightly different level of detail:https://lists.openwrt.org/pipermail/openwrt-devel/2010-November/008570.html.--
>>
>> I'll take a look at this once I get done with the
>> compat-wireless-2.6.37 release. Thanks for the report.
>
> I'm looking at this now, can you do me a favor and test against
> today's wireless-testing to verify the issue is still present? I'll be
> digging at this in the mean time.

I can reproduce this easily now with:

mcgrof@flash ~ $ sudo cat /sbin/crda
#!/bin/bash
echo $COUNTRY >> /tmp/log
sleep 2
/sbin/crda.orig


mcgrof@flash ~ $ iw reg get
country 98:
        (2402 - 2472 @ 40), (N/A, 20)
        (2457 - 2482 @ 20), (N/A, 20), PASSIVE-SCAN, NO-IBSS
        (2474 - 2482 @ 8), (N/A, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
        (5170 - 5250 @ 40), (N/A, 20), PASSIVE-SCAN, NO-IBSS

You don't even have to use ath9k, just use mac80211_hwsim with:

modprobe mac80211_hwsim regtest=2

I get (I'm trimming irrelevant output)

Wiphy phy1
        Band 1:
                Frequencies:
                        * 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)
                        * 2472 MHz [13] (20.0 dBm)
                        * 2484 MHz [14] (disabled)
        Band 2:
                Frequencies:
                        * 5180 MHz [36] (20.0 dBm)
                        * 5200 MHz [40] (20.0 dBm)
                        * 5220 MHz [44] (20.0 dBm)
                        * 5240 MHz [48] (20.0 dBm)
                        * 5260 MHz [52] (20.0 dBm) (radar detection)
                        * 5280 MHz [56] (20.0 dBm) (radar detection)
                        * 5300 MHz [60] (20.0 dBm) (radar detection)
                        * 5320 MHz [64] (20.0 dBm) (radar detection)
                        * 5500 MHz [100] (20.0 dBm) (radar detection)
                        * 5520 MHz [104] (20.0 dBm) (radar detection)
                        * 5540 MHz [108] (20.0 dBm) (radar detection)
                        * 5560 MHz [112] (20.0 dBm) (radar detection)
                        * 5580 MHz [116] (20.0 dBm) (radar detection)
                        * 5600 MHz [120] (20.0 dBm) (radar detection)
                        * 5620 MHz [124] (20.0 dBm) (radar detection)
                        * 5640 MHz [128] (20.0 dBm) (radar detection)
                        * 5660 MHz [132] (20.0 dBm) (radar detection)
                        * 5680 MHz [136] (20.0 dBm) (radar detection)
                        * 5700 MHz [140] (20.0 dBm) (radar detection)
                        * 5745 MHz [149] (disabled)
                        * 5765 MHz [153] (disabled)
                        * 5785 MHz [157] (disabled)
                        * 5805 MHz [161] (disabled)
                        * 5825 MHz [165] (disabled)
Wiphy phy0
        Band 1:
                Frequencies:
                        * 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, no IBSS)
                        * 2472 MHz [13] (20.0 dBm) (passive scanning, no IBSS)
                        * 2484 MHz [14] (disabled)
        Band 2:
                Frequencies:
                        * 5180 MHz [36] (20.0 dBm) (passive scanning, no IBSS)
                        * 5200 MHz [40] (20.0 dBm) (passive scanning, no IBSS)
                        * 5220 MHz [44] (20.0 dBm) (passive scanning, no IBSS)
                        * 5240 MHz [48] (20.0 dBm) (passive scanning, no IBSS)
                        * 5260 MHz [52] (disabled)
                        * 5280 MHz [56] (disabled)
                        * 5300 MHz [60] (disabled)
                        * 5320 MHz [64] (disabled)
                        * 5500 MHz [100] (disabled)
                        * 5520 MHz [104] (disabled)
                        * 5540 MHz [108] (disabled)
                        * 5560 MHz [112] (disabled)
                        * 5580 MHz [116] (disabled)
                        * 5600 MHz [120] (disabled)
                        * 5620 MHz [124] (disabled)
                        * 5640 MHz [128] (disabled)
                        * 5660 MHz [132] (disabled)
                        * 5680 MHz [136] (disabled)
                        * 5700 MHz [140] (disabled)
                        * 5745 MHz [149] (disabled)
                        * 5765 MHz [153] (disabled)
                        * 5785 MHz [157] (disabled)
                        * 5805 MHz [161] (disabled)
                        * 5825 MHz [165] (disabled)

  Luis

Re: Regulatory/CRDA Race

[Luis R. Rodriguez]

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Re: Regulatory/CRDA Race

[Luis R. Rodriguez]

>>>> On Mon, Nov 8, 2010 at 11:40 AM, Mark Mentovai <mark@moxienet.com> wrote:
>>>>> 3. The second card’s driver (also ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request sees that the last request came from a driver (instead of the core) and since the regulatory domain is changing from 00 to US, decides that intersection must be performed.

This interpretation however is incorrect, as a driver hint shall
always be respected if the current regulatory domain is 00. We do end
up with an intersection but there is another reason and that is the
bug. I will try to track it down.

  Luis

Re: Regulatory/CRDA Race

[Luis R. Rodriguez]

On Thu, Nov 11, 2010 at 4:04 PM, Luis R. Rodriguez <mcgrof@gmail.com> wrote:
>>>>> On Mon, Nov 8, 2010 at 11:40 AM, Mark Mentovai <mark@moxienet.com> wrote:
>>>>>> 3. The second card’s driver (also ath9k) calls regulatory_hint to provide US as a driver hint. ignore_request sees that the last request came from a driver (instead of the core) and since the regulatory domain is changing from 00 to US, decides that intersection must be performed.
>
> This interpretation however is incorrect, as a driver hint shall
> always be respected if the current regulatory domain is 00. We do end
> up with an intersection but there is another reason and that is the
> bug. I will try to track it down.

OK fixed, please try the posted patch.

  Luis