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nl80211: Disallow setting of HT for channel 14

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This patch disables setting of HT20 and more for channel 14 because
the channel is only for IEEE 802.11b.

The patch for net/wireless/util.c was unit-tested.

The patch for net/wireless/chan.c was tested with iw command.

Before this patch.
$ sudo iw dev <ifname> set channel 14 HT20
$

After this patch.
$ sudo iw dev <ifname> set channel 14 HT20
kernel reports: invalid channel definition
command failed: Invalid argument (-22)
$

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>
Link: https://lore.kernel.org/r/20191021075045.2719-1-masashi.honma@gmail.com
[clean up the code, use != instead of equivalent >]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Masashi Honma 2019-10-21 16:50:45 +09:00 committed by Johannes Berg
parent 6f74a55d49
commit ec649fed66
2 changed files with 7 additions and 1 deletions
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5
net/wireless/chan.c
View File

@ -204,6 +204,11 @@ bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
return false;
}
/* channel 14 is only for IEEE 802.11b */
if (chandef->center_freq1 == 2484 &&
chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
return false;
if (cfg80211_chandef_is_edmg(chandef) &&
!cfg80211_edmg_chandef_valid(chandef))
return false;

3
net/wireless/util.c
View File

@ -1559,7 +1559,8 @@ bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
}
if (freq == 2484) {
if (chandef->width > NL80211_CHAN_WIDTH_40)
/* channel 14 is only for IEEE 802.11b */
if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
return false;
*op_class = 82; /* channel 14 */