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authorJohannes Berg <johannes.berg@intel.com>2011-07-18 18:08:35 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-07-19 16:49:58 -0400
commit34850ab25d74ab4eead62c3b4a9e8036a25cc669 (patch)
treec1aa56f2d94851804969b71523ade13bb9db693c /net/wireless/util.c
parent0b5dd734d3545a9833c0bceeed5088ad9a1ca5e3 (diff)
cfg80211: allow userspace to control supported rates in scan
Some P2P scans are not allowed to advertise 11b rates, but that is a rather special case so instead of having that, allow userspace to request the rate sets (per band) that are advertised in scan probe request frames. Since it's needed in two places now, factor out some common code parsing a rate array. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/util.c')
-rw-r--r--net/wireless/util.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 4d7b83fbc32..a329429bfdd 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1006,3 +1006,38 @@ int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
return -EBUSY;
}
+
+int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
+ const u8 *rates, unsigned int n_rates,
+ u32 *mask)
+{
+ int i, j;
+
+ if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
+ return -EINVAL;
+
+ *mask = 0;
+
+ for (i = 0; i < n_rates; i++) {
+ int rate = (rates[i] & 0x7f) * 5;
+ bool found = false;
+
+ for (j = 0; j < sband->n_bitrates; j++) {
+ if (sband->bitrates[j].bitrate == rate) {
+ found = true;
+ *mask |= BIT(j);
+ break;
+ }
+ }
+ if (!found)
+ return -EINVAL;
+ }
+
+ /*
+ * mask must have at least one bit set here since we
+ * didn't accept a 0-length rates array nor allowed
+ * entries in the array that didn't exist
+ */
+
+ return 0;
+}