linux-kernel - Re: [RFC 1/2] cfg80211: Add channel flags limiting availability to OCB mode only

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Date:	Mon, 26 May 2014 11:06:39 +0200
From:	Rostislav Lisovy <lisovy@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michal Sojka <sojkam1@....cvut.cz>, s.sander@...dsys.de,
	jan-niklas.meier@...kswagen.de,
	Rostislav Lisovy <rostislav.lisovy@....cvut.cz>
Subject: Re: [RFC 1/2] cfg80211: Add channel flags limiting availability to
 OCB mode only

On Mon, 2014-05-19 at 16:51 +0200, Johannes Berg wrote:
> This patch is fine, but insufficient - you should also do something
> with
> the new flags?

That's definitely a good point. I think the biggest issue is that the
flags can't be checked only with the knowledge of the 'wiphy' but they
are related to the 'vif' type -- this prohibits checking in the
cfg80211_chandef_usable() (I assume).

Would the following be sufficient?

--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -801,6 +801,10 @@ static int __ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata,
 		*changed |= BSS_CHANGED_BANDWIDTH;
 	}
 
+	if (sdata->vif.type == NL80211_IFTYPE_OCB &&
+	    !(chandef->chan->flags & IEEE80211_CHAN_OCB_ONLY))
+		return -EINVAL;
+
 	sdata->vif.bss_conf.chandef = *chandef;
 	ctx->conf.def = *chandef;
 
@@ -1049,6 +1053,12 @@ int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
 		goto out;
 	}
 
+	if (sdata->vif.type == NL80211_IFTYPE_OCB &&
+	    !(chandef->chan->flags & IEEE80211_CHAN_OCB_ONLY)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
 	    sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
 		ret = -EINVAL;

--
Best regards;
Rostislav Lisovy


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