wpa_supplicant: Add get_capability freq

Add "get_capability freq" command to print a more verbose list of
channels and frequencies in MHz. The tag "NO_IBSS" is added, if IBSS
mode is not allowed on a channel. This allows userspace programs to get
the frequencies and limitations associated with each channel.

This extends the information already provided in "get_capability
channels" but a new interface is chosen because of backwards
compatibility considerations.

Signed-hostap: Bruno Randolf <br1@einfach.org>

wpa_supplicant/ctrl_iface.c

@@ -2944,6 +2944,60 @@ static int ctrl_iface_get_capability_channels(struct wpa_supplicant *wpa_s,
 }
 
 
+static int ctrl_iface_get_capability_freq(struct wpa_supplicant *wpa_s,
+					  char *buf, size_t buflen)
+{
+	struct hostapd_channel_data *chnl;
+	int ret, i, j;
+	char *pos, *end, *hmode;
+
+	pos = buf;
+	end = pos + buflen;
+
+	for (j = 0; j < wpa_s->hw.num_modes; j++) {
+		switch (wpa_s->hw.modes[j].mode) {
+		case HOSTAPD_MODE_IEEE80211B:
+			hmode = "B";
+			break;
+		case HOSTAPD_MODE_IEEE80211G:
+			hmode = "G";
+			break;
+		case HOSTAPD_MODE_IEEE80211A:
+			hmode = "A";
+			break;
+		case HOSTAPD_MODE_IEEE80211AD:
+			hmode = "AD";
+			break;
+		default:
+			continue;
+		}
+		ret = os_snprintf(pos, end - pos, "Mode[%s] Channels:\n",
+				  hmode);
+		if (ret < 0 || ret >= end - pos)
+			return pos - buf;
+		pos += ret;
+		chnl = wpa_s->hw.modes[j].channels;
+		for (i = 0; i < wpa_s->hw.modes[j].num_channels; i++) {
+			if (chnl[i].flag & HOSTAPD_CHAN_DISABLED)
+				continue;
+			ret = os_snprintf(pos, end - pos, " %d = %d MHz%s\n",
+					  chnl[i].chan, chnl[i].freq,
+					  chnl[i].flag & HOSTAPD_CHAN_NO_IBSS ?
+					  " (NO_IBSS)" : "");
+			if (ret < 0 || ret >= end - pos)
+				return pos - buf;
+			pos += ret;
+		}
+		ret = os_snprintf(pos, end - pos, "\n");
+		if (ret < 0 || ret >= end - pos)
+			return pos - buf;
+		pos += ret;
+	}
+
+	return pos - buf;
+}
+
+
 static int wpa_supplicant_ctrl_iface_get_capability(
 	struct wpa_supplicant *wpa_s, const char *_field, char *buf,
 	size_t buflen)
@@ -3001,6 +3055,9 @@ static int wpa_supplicant_ctrl_iface_get_capability(
 	if (os_strcmp(field, "channels") == 0)
 		return ctrl_iface_get_capability_channels(wpa_s, buf, buflen);
 
+	if (os_strcmp(field, "freq") == 0)
+		return ctrl_iface_get_capability_freq(wpa_s, buf, buflen);
+
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE: Unknown GET_CAPABILITY field '%s'",
 		   field);
 

wpa_supplicant/wpa_cli.c

@@ -2445,7 +2445,7 @@ static struct wpa_cli_cmd wpa_cli_commands[] = {
 	  "<<idx> | <bssid>> = get detailed scan result info" },
 	{ "get_capability", wpa_cli_cmd_get_capability, NULL,
 	  cli_cmd_flag_none,
-	  "<eap/pairwise/group/key_mgmt/proto/auth_alg/channels/modes> "
+	  "<eap/pairwise/group/key_mgmt/proto/auth_alg/channels/freq/modes> "
 	  "= get capabilies" },
 	{ "reconfigure", wpa_cli_cmd_reconfigure, NULL,
 	  cli_cmd_flag_none,