Re: [PATCH] wireless-regdb: add DFS CAC time parameter

[Janusz Dziedzic <janusz.dziedzic@tieto.com>]

On 21 May 2014 21:09, Johannes Berg <johannes@sipsolutions.net> wrote:
> On Wed, 2014-05-21 at 14:00 -0400, John W. Linville wrote:
>
>> The 'do not parse more permissively' would seem to be a problem if
>> we still produce an older format too, no?  I mean, wouldn't we have
>> to simply drop new rules to produce an older binary?  Even worse if
>> we left the old binary in place, since then you could never update
>> any rules for old crda installations at all.
>
> That's true, in a sense.
>
>> It seems like forcing a crda update to use any new format-breaking
>> rules might just be the right thing.  Can we make crda choke and die
>> loudly when it sees an unknown format?  Will the current crda do that?
>
> It will, yes. If the version number is mismatched it'll print "Invalid
> database version" (to stderr) and exit.
>

Why not just skip this binary interface between regdb --> crda and use
signed db.txt file?

Eg.
1) first we sign db.txt file using gpg - that will be all what
wireless-regdb will do

        cat db.txt | gpg --clearsign --default-key regdbkey_private >
db_signed.txt

As a result we will get something like this:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

# This is the world regulatory domain
country 00:
(2402 - 2472 @ 40), (20)
# Channel 12 - 13.
(2457 - 2482 @ 20), (20), NO-IR AUTO-BW
# Channel 14. Only JP enables this and for 802.11b only
(2474 - 2494 @ 20), (20), NO-IR
# Channel 36 - 48
(5170 - 5250 @ 80), (20), NO-IR
# NB: 5260 MHz - 5700 MHz requies DFS
# Channel 149 - 165
(5735 - 5835 @ 80), (20), NO-IR
# IEEE 802.11ad (60GHz), channels 1..3
(57240 - 63720 @ 2160), (0)

....

country ZW: DFS-ETSI
(2402 - 2482 @ 40), (20)
(5170 - 5250 @ 80), (20)
(5250 - 5330 @ 80), (20), DFS
(5490 - 5710 @ 80), (27), DFS

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)

iQEcBAEBAgAGBQJTkbhXAAoJEJMu885bZibypxYH+QEVe1VNDalrzS99luWrqLn1
Cfrck6l4rdb/z+Ef1lGRxjYtvad/bRTYBHLwWqJEt/R5dvf1k32sNlZU+++dBLsg
IFBHlVdYa7DQok0K0Hfw8jGU3S6+XrSnFUHhiBR0NRP/SJGzevSE+MhVNulf6bZu
/uN1nW/+VCZ46wh5EGarWO3cWFCAJKJXujPWN6Zm97ieOBtAN95BHk29h5g+aSNS
NcszEvbIy86kKquCTUWQcAgUAp0ZijlQin1NoXr87Z3k9vKSAIK4kp+8WIfnHYYE
Y3g/lOMHh6bKOKllYxBxWNZQIgLP1R2yf/qv8JyGfeQTNfNlCihIQRFQeU0Hj5U=
=pCXt
-----END PGP SIGNATURE-----

2) crda will be a script that will do something like that:

        sh gpg_verify.sh && sh show_country.sh | crda_tiny

a) gpg_verify.sh will verify db.txt signature
- gpg --default-key regdb_public --verify db_signed.txt

b) show_country.sh will print text country base on COUNTRY enviroment
eg.
janusz@dell:~/work/gpg$ COUNTRY=US ./show_country.sh
country US: DFS-FCC
(2402 - 2472 @ 40), (30)
(5170 - 5250 @ 80), (17)
(5250 - 5330 @ 80), (23), DFS
(5735 - 5835 @ 80), (30)
(57240 - 63720 @ 2160), (40)

c) crda_tiny will parse this text and will pass regdb parameters using nl80211


BR
Janusz