iwinfo: export ht and vht operation in scan results

Export ht and vht operation data in scan results. These additional data
can be usefull to check wifi channel utilizzation by neraby stations.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

include/iwinfo.h

@@ -170,6 +170,38 @@ struct iwinfo_crypto_entry {
 	uint8_t auth_algs;
 };
 
+struct iwinfo_scanlist_ht_chan_entry {
+	uint8_t primary_chan;
+	uint8_t secondary_chan_off;
+	uint8_t chan_width;
+};
+
+struct iwinfo_scanlist_vht_chan_entry {
+	uint8_t chan_width;
+	uint8_t center_chan_1;
+	uint8_t center_chan_2;
+};
+
+static const char *ht_secondary_offset[4] = {
+	"no secondary",
+	"above",
+	"[reserved!]",
+	"below",
+};
+
+
+static uint16_t ht_chan_width[2] = {
+	20, /* 20 MHz */
+	2040, /* 40 MHz or higher (refer to vht if supported) */
+};
+
+static uint16_t vht_chan_width[] = {
+	[0] = 40, /* 40 MHz or lower (refer to ht to a more precise width) */
+	[1] = 80, /* 80 MHz */
+	[3] = 8080, /* 80+80 MHz */
+	[2] = 160, /* 160 MHz */
+};
+
 struct iwinfo_scanlist_entry {
 	uint8_t mac[6];
 	char ssid[IWINFO_ESSID_MAX_SIZE+1];
@@ -179,6 +211,8 @@ struct iwinfo_scanlist_entry {
 	uint8_t quality;
 	uint8_t quality_max;
 	struct iwinfo_crypto_entry crypto;
+	struct iwinfo_scanlist_ht_chan_entry ht_chan_info;
+	struct iwinfo_scanlist_vht_chan_entry vht_chan_info;
 };
 
 struct iwinfo_country_entry {

iwinfo_cli.c

@@ -323,6 +323,20 @@ static char * format_assocrate(struct iwinfo_rate_entry *r)
 	return buf;
 }
 
+static const char* format_chan_width(uint16_t width)
+{
+	switch (width) {
+		case 20: return "20 MHz";
+		case 2040: return "40 MHz and upper or 20 MHz with intolerant bit";
+		case 40: return "40 MHz or lower";
+		case 80: return "80 MHz";
+		case 8080: return "80+80 MHz";
+		case 160: return "160 MHz";
+	}
+
+	return "unknown";
+}
+
 
 static const char * print_type(const struct iwinfo_ops *iw, const char *ifname)
 {
@@ -612,8 +626,27 @@ static void print_scanlist(const struct iwinfo_ops *iw, const char *ifname)
 			format_signal(e->signal - 0x100),
 			format_quality(e->quality),
 			format_quality_max(e->quality_max));
-		printf("          Encryption: %s\n\n",
+		printf("          Encryption: %s\n",
 			format_encryption(&e->crypto));
+		printf("          HT Operation:\n");
+		printf("                    Primary Channel: %d\n",
+			e->ht_chan_info.primary_chan);
+		printf("                    Secondary Channel Offset: %s\n",
+			ht_secondary_offset[e->ht_chan_info.secondary_chan_off]);
+		printf("                    Channel Width: %s\n",
+			format_chan_width(e->ht_chan_info.chan_width));
+
+		if (e->vht_chan_info.center_chan_1) {
+			printf("          VHT Operation:\n");
+			printf("                    Channel Width: %s\n",
+				format_chan_width(e->vht_chan_info.chan_width));
+			printf("                    Center Frequency 1: %d\n",
+				 e->vht_chan_info.center_chan_1);
+			printf("                    Center Frequency 2: %d\n",
+				 e->vht_chan_info.center_chan_2);
+		}
+
+		printf("\n");
 	}
 }
 

iwinfo_nl80211.c

@@ -2306,6 +2306,16 @@ static void nl80211_get_scanlist_ie(struct nlattr **bss,
 				iwinfo_parse_rsn(&e->crypto, ie + 6, ie[1] - 4,
 				                 IWINFO_CIPHER_TKIP, IWINFO_KMGMT_PSK);
 			break;
+		case 61: /* HT oeration */
+			e->ht_chan_info.primary_chan = ie[2];
+			e->ht_chan_info.secondary_chan_off = ie[3] & 0x3;
+			e->ht_chan_info.chan_width = (ie[4] & 0x4)>>2;
+			break;
+		case 192: /* VHT operation */
+			e->vht_chan_info.chan_width = ie[2];
+			e->vht_chan_info.center_chan_1 = ie[3];
+			e->vht_chan_info.center_chan_2 = ie[4];
+			break;
 		}
 
 		ielen -= ie[1] + 2;