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authorMasashi Honma <masashi.honma@gmail.com>2019-10-21 16:50:45 +0900
committerJohannes Berg <johannes.berg@intel.com>2019-10-30 10:07:22 +0100
commitec649fed66bb242cca145ab364485c5a126efc53 (patch)
tree745bafb2a61d280f07c43b8b0643fc07488dd628
parent6f74a55d49004df760381df525f14edf018a640f (diff)
nl80211: Disallow setting of HT for channel 14
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>
-rw-r--r--net/wireless/chan.c5
-rw-r--r--net/wireless/util.c3
2 files changed, 7 insertions, 1 deletions
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index e851cafd8e2f..fcac5c6366e1 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -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;
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 419eb12c1e93..5b4ed5bbc542 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -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 */