cfg80211: Fix parsed country IE info for 5 GHz
The country IE number of channels on 5 GHz specifies the number
of 5 GHz channels, not the number of sequential channel numbers.
For example, if in a country IEs if the first channel given is 36
and the number of channels passed is 4 then the individual channel
numbers defined for the 5 GHz PHY by these parameters
are: 36, 40, 44, 48
not: 36, 37, 38, 39
See: http://tinyurl.com/11d-clarification
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 5f6d20d..bc494ce 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -563,6 +563,7 @@
/* This time around we fill in the rd */
while (country_ie_len >= 3) {
+ int end_channel = 0;
struct ieee80211_country_ie_triplet *triplet =
(struct ieee80211_country_ie_triplet *) country_ie;
struct ieee80211_reg_rule *reg_rule = NULL;
@@ -584,6 +585,23 @@
reg_rule->flags = flags;
+ /* 2 GHz */
+ if (triplet->chans.first_channel <= 14)
+ end_channel = triplet->chans.first_channel +
+ triplet->chans.num_channels;
+ else
+ /*
+ * 5 GHz -- For example in country IEs if the first
+ * channel given is 36 and the number of channels is 4
+ * then the individual channel numbers defined for the
+ * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
+ * and not 36, 37, 38, 39.
+ *
+ * See: http://tinyurl.com/11d-clarification
+ */
+ end_channel = triplet->chans.first_channel +
+ (4 * (triplet->chans.num_channels - 1));
+
/* The +10 is since the regulatory domain expects
* the actual band edge, not the center of freq for
* its start and end freqs, assuming 20 MHz bandwidth on
@@ -593,8 +611,7 @@
triplet->chans.first_channel) - 10);
freq_range->end_freq_khz =
MHZ_TO_KHZ(ieee80211_channel_to_frequency(
- triplet->chans.first_channel +
- triplet->chans.num_channels) + 10);
+ end_channel) + 10);
/* Large arbitrary values, we intersect later */
/* Increment this if we ever support >= 40 MHz channels