Received-SPF: pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH] nl80211: allow more operations for mesh and ad-hoc
 interfaces
To:     Johannes Berg <johannes@sipsolutions.net>
Cc:     linux-wireless@vger.kernel.org
References: <20191029115602.78990-1-markus.theil@tu-ilmenau.de>
 <4b9c7b36f175667a76609c6560618bb48a321ed8.camel@sipsolutions.net>
From:   Markus Theil <markus.theil@tu-ilmenau.de>
Openpgp: preference=signencrypt
Autocrypt: addr=markus.theil@tu-ilmenau.de; prefer-encrypt=mutual; keydata=
 xsFNBFcopAYBEADBcwd5L8+T0zgqq4kYY4nQt6CYh5sOalHdI3zNE6fWbRbzQwViIlC9Q0q/
 ys+nMmQajMWHalsgcdeVSQ2GJ/06qhtogCpmL3d2/GdlvVROh33zeqwqevscKvPH5i7oiBhh
 dMs8/5g89q4aTYtyaausy8qQbv3Q8BCVkwFW2pEcqfxNKgWi/8nM2A3powNA9gzCR2rmoGyd
 nvQNkk0MCwT8JSGnUkiEYEkWF4aIr3XToavpn+OMIIIizcDzRwU5NBmC3Q07PQTn8Srr+rJQ
 DF65vgaoI8G7wlNLQYavL1uFX1LVMP1jVr6GMOczeURqiF/QSuHCdyT3R8P3Qknc74tGT2Ow
 EbxllMnk1gvSfGQq47EYIvuXFyMUWOjjtgP+NxryXVAvQBmuqWWjRjfqMSx9URhvB/ZMQLbZ
 LUPNW0Whl/vOQdxVbEMQOSKhKYoWKeCDe7567sEi02bMScvr6ybKBvRMs71hT1T+HFcBE/IJ
 g3ZX+6qRzs+XKLTFGipRbRiLYKKNR+UM/sNc/w+3BTowB9g/cQukrITvb792T4/IPBJzpEry
 9eZFhFTlIqggy/fGrpZkEpEsOyOWYlRyseETvNdrdeVG7dRGPj68jKUWTVcAaAAiu8WhgnvG
 4tvpaORUhjdg4DfkbE9b9lvYkeesFsE0bUAd5z2DeVbtR0QBUwARAQABzSlNYXJrdXMgVGhl
 aWwgPG1hcmt1cy50aGVpbEB0dS1pbG1lbmF1LmRlPsLBfQQTAQoAJwUCVyikBgIbAwUJB4Yf
 gAULCQgHAwUVCgkICwUWAgMBAAIeAQIXgAAKCRBt3CLaT/oEE5bzD/94Ezfl7mm57PXniW3m
 yIcjofJXw7YCJOprUon36W2Na2xrH3j8QH/sqkfTyCoj1LWxxDGQs+CQGkZ47cX+H1KqKKSS
 iGoNRV/cvoozWe7cn9bAvR3JkqLxjIi0vp68rs/f6ZI49N7zuZAsSBrXN2/2xIgH+mRoAPyw
 mgzaIXZL87vajXol4TlbMaC7blRs6Q4kzOP7ZjvfM/yxwUsifQltNY4wAEWKXLk67ij9akGO
 FG+y3sHF1HYH3w0sB+mIIN3x4BjYqXSH3XDx4xvCQXWkHmFl1RoQbJDvMjxP5/HXLR3omPjF
 ZpV657Grh/PgonwZ/U6sigaA11pjcPfkYNYkcGyb0OMqSKb3Ke52/bhxv4pPWrKRS7btMhj7
 4zuMDk9V+De3YFXvKGllXBMAA6J8TlY71rlcOWKyBQNLLkUZ7/uAA949GTNzM0fPTRqry5qn
 WCR/ekzm3VyFgjWSun39L1W13bJW8aUu8k5x2KWq4YrdB0TOYZpKSAconOHVxhkEMxLwRUfZ
 B9kEPqlfQY5YYE6ZoZQF38Kvx3VFuAnhf+82PjMMrkQ3g07D3xJlq7xWdq1jrwG1QxmVFS64
 g+oWM9IIFisvVspNrJAEgSGmYgTw+VT3PDP3Gj8sqD32mWb18bVE9I5FyagOewKdLpqcljIi
 Bz8WAuz+RbwX4i/mMs7BTQRXKKQGARAAzTGnHyUtTBcGHMKArcGiVnCB6knTFgU7I1gsoBrc
 J1bo0JRJj1lduYkdm12kC49c4dZtv1CciQIN9UEpalZsB2TXaC/xaDJ2IsZuHLOOaqSSwVg/
 Bs41vMeFYmmwRRN1y6MQRCBobCC6KNuCpgtEmS/v4hurISt+MoPIppjK6E7tJQ0lgtfRHq/M
 HW+Wabw5Nq3OFSaLYC3nRJkoB1Vej8XGO8X6URWnZmL3xcnkIkoH13y2WTO0lJz9tF47t5U2
 +xWrFMR+a6ow/QPL4Wi53IqhXDqa6OUzDAUuplZOm71VhwsEkk6u0YjzNRbgAYMBh7iye2j/
 4Lf2+YUB8+uKimpsEwW0nR85sKCQm102Zb9+1bYXPuIIP9HbVNy77X4aM9V0W48zBTqWZzh8
 2i0oq8z1xN3qeuZbAXnzelKZvE1wM9cLQ3YHA629J2OGe3dkv2+untuyj6KMCEU3+vp6j7TX
 hKf+jy3PIrQcQmzMTs7xnkEm5LvbAtaZLrg4OGYjSpvH4bKsLA3sNGt5Xqsuqh5dsO7ccX1G
 nfY7Ug8UyNT5/0gZVkOileTQl0KtgwO9VBXAdrmMPHFldRn3dGNiGlCbxnsaNQDfQwTFmDu0
 1TjzwC4byWLQT+C7yCTk8h9q0NwmCJ5yG7Fe7VUUpA+ZVLyMSt+tSpH8v3n+3I2AKoMAEQEA
 AcLBZQQYAQoADwUCVyikBgIbDAUJB4YfgAAKCRBt3CLaT/oEE7lZEACgrOxRaCQ7D5Rc4BOA
 N4VDIQqVch8X3pBE/k/v3UopkgmYnP4RlhegWr4wp2E6Vuyt8nwnZs3WhxQENfMjd5rV3WhG
 k5ib+pmLvtAht5j8jfP5+UKUTvX1a6oMi98PT8PuQ70oKM7T/KN+RpXIHoz/2Dgde1RQpwKC
 XWtkU9tBF87fE8FfwuqS6myOfd8zc6fOVV/fxmTXVC8qA7tB+0tOSDHB80GRYwnlumChOtOB
 Np8ABFWryE2e6mZZnp9Tpd1A74B45z6l445f5BixGLExAOoTJNA2k0JWx79/2Yi+pwTnQMzW
 QBLa48MnL3DUlVlahz1FZfGbA2U5NARS8iRdUhCaHL0Lph8HxWJwYA5w2afyCCwRD7xFo44V
 jsCNbqtZ6TrFARJdrbeWQl3RZ4Y+uuvN9mgvttVenAbx5d68IariYtXashucQeIMoqIloHTN
 sJDaupNm6+A9T3Re5yXmZsrWSxEEEGv1Bh+5DH6vauP0Ng0ebZ4c6jXfgLpPnAUWlV0rnmrJ
 q9141nbyLRYAhUXxiqajb+Zocp2Am4BF19rBUa1C78ooye9XShhuQvDTB6tZuiYWc24tiyqb
 IjR1hmG/zg8APhURAv/zUubaf4IA7v5YHVQqAbpUfb6ePlPVJBtVw2CwXFrGwnqDFh82La8D
 sGZPq8zmOtvOyZtafA==
Organization: TU Ilmenau
Message-ID: <f9828fb2-eda9-5e05-7683-0c180e994f43@tu-ilmenau.de>
Date:   Wed, 30 Oct 2019 14:40:48 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.9.0
MIME-Version: 1.0
In-Reply-To: <4b9c7b36f175667a76609c6560618bb48a321ed8.camel@sipsolutions.net>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8BIT
Content-Language: en-US
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

On 30.10.19 10:03, Johannes Berg wrote:
> On Tue, 2019-10-29 at 12:56 +0100, Markus Theil wrote:
>> This change allows mesh and ad-hoc interfaces to change beacons and
>> tx queue settings. The direct change of these settings should be ok
>> for these kind of interfaces and should maybe only forbidden for
>> station-like interface types.
> "should maybe"? :-)
>
> Not really, both of the changes are wrong.
>
> johannes
>
Mesh interfaces are allowed to perform EDCA according to the standard
802.11-2016. Of course, they
should not implement HCF with HCCA as in 10.2.4.1: "The HCF shall be
implemented in all QoS STAs except mesh STAs". But the MCF section
(10.23.2 MCF contention based channel access) says: "MCF implements the
same EDCA (see 10.22.2) as does HCF."
QoS IBSS are also allowed in the standard: e.g. 4.7: "A QoS IBSS
supports operation under the HCF using TXOPs gained through the EDCA
mechanism." Of course, mesh STAs cannot send the EDCA parameter set in
their beacons according to Table 9-27: "... is present if
dot11QosOptionImplemented is true, and dot11MeshActivated is false, ...".

Changing beacons on the fly from user-space in these modes is only
useful, if vendor-specific elements are used, which can change over time.

All in all I can nevertheless understand your point, that these changes
could be "wrong" from a pragmatic point of view.

Markus