From: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
Date: Mon, 6 Aug 2018 19:46:22 +0000 (-0400)
Subject: Add utility function to derive operating class and channel
X-Git-Tag: hostap_2_8~787
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dbe473fd22777ec349b28d16ef5d8b9a48176a2a;p=thirdparty%2Fhostap.git

Add utility function to derive operating class and channel

This function can be used to easily convert the parameters returned
by the channel_info driver API, into their corresponding operating
class and channel number.

Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
---

diff --git a/src/common/ieee802_11_common.c b/src/common/ieee802_11_common.c
index e1ef27795..d1cc101b0 100644
--- a/src/common/ieee802_11_common.c
+++ b/src/common/ieee802_11_common.c
@@ -896,6 +896,41 @@ enum hostapd_hw_mode ieee80211_freq_to_channel_ext(unsigned int freq,
 }
 
 
+int ieee80211_chaninfo_to_channel(unsigned int freq, enum chan_width chanwidth,
+				  int sec_channel, u8 *op_class, u8 *channel)
+{
+	int vht = CHAN_WIDTH_UNKNOWN;
+
+	switch (chanwidth) {
+	case CHAN_WIDTH_UNKNOWN:
+	case CHAN_WIDTH_20_NOHT:
+	case CHAN_WIDTH_20:
+	case CHAN_WIDTH_40:
+		vht = VHT_CHANWIDTH_USE_HT;
+		break;
+	case CHAN_WIDTH_80:
+		vht = VHT_CHANWIDTH_80MHZ;
+		break;
+	case CHAN_WIDTH_80P80:
+		vht = VHT_CHANWIDTH_80P80MHZ;
+		break;
+	case CHAN_WIDTH_160:
+		vht = VHT_CHANWIDTH_160MHZ;
+		break;
+	}
+
+	if (ieee80211_freq_to_channel_ext(freq, sec_channel, vht, op_class,
+					  channel) == NUM_HOSTAPD_MODES) {
+		wpa_printf(MSG_WARNING,
+			   "Cannot determine operating class and channel (freq=%u chanwidth=%d sec_channel=%d)",
+			   freq, chanwidth, sec_channel);
+		return -1;
+	}
+
+	return 0;
+}
+
+
 static const char *const us_op_class_cc[] = {
 	"US", "CA", NULL
 };
diff --git a/src/common/ieee802_11_common.h b/src/common/ieee802_11_common.h
index ff7e51de3..e801caf45 100644
--- a/src/common/ieee802_11_common.h
+++ b/src/common/ieee802_11_common.h
@@ -12,6 +12,7 @@
 #include "defs.h"
 
 struct hostapd_hw_modes;
+enum chan_width;
 
 #define MAX_NOF_MB_IES_SUPPORTED 5
 
@@ -160,6 +161,8 @@ int ieee80211_chan_to_freq(const char *country, u8 op_class, u8 chan);
 enum hostapd_hw_mode ieee80211_freq_to_channel_ext(unsigned int freq,
 						   int sec_channel, int vht,
 						   u8 *op_class, u8 *channel);
+int ieee80211_chaninfo_to_channel(unsigned int freq, enum chan_width chanwidth,
+				  int sec_channel, u8 *op_class, u8 *channel);
 int ieee80211_is_dfs(int freq, const struct hostapd_hw_modes *modes,
 		     u16 num_modes);
 enum phy_type ieee80211_get_phy_type(int freq, int ht, int vht);