1 files changed, 38 insertions, 0 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 4d7b83fbc32f..be75a3a0424e 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1006,3 +1006,41 @@ 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 (!sband)
+		return -EINVAL;
+
+	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;
+}