[PATCH] Scan other networks first to unlock 5GHz bands on Intel cards

[Pedro Goncalves (developer account)]

Subject: [PATCH] For intel Wi-Fi cards, force to scan other wireless networks so the drive is able to set the correct region - master

Signed-off-by: Pedro Goncalves <pgoncalves-developer at protonmail.com>
---
Index: src/ap/hostapd.h
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
--- a/src/ap/hostapd.h	(revision e7172e26d3ebe962150a2e579e40d3a69e8f7304)
+++ b/src/ap/hostapd.h	(date 1721057509037)
@@ -746,6 +746,7 @@
 int hostapd_add_iface(struct hapd_interfaces *ifaces, char *buf);
 int hostapd_remove_iface(struct hapd_interfaces *ifaces, char *buf);
 void hostapd_channel_list_updated(struct hostapd_iface *iface, int initiator);
+void hostapd_scan_results_updated(struct hostapd_iface *iface);
 void hostapd_set_state(struct hostapd_iface *iface, enum hostapd_iface_state s);
 const char * hostapd_state_text(enum hostapd_iface_state s);
 int hostapd_csa_in_progress(struct hostapd_iface *iface);
Index: src/ap/hostapd.c
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
--- a/src/ap/hostapd.c	(revision e7172e26d3ebe962150a2e579e40d3a69e8f7304)
+++ b/src/ap/hostapd.c	(date 1721241666773)
@@ -1992,11 +1992,15 @@
 					   NULL);
 		return;
 	}
+}
 
-	if (!iface->wait_channel_update || initiator != REGDOM_SET_BY_USER)
+
+void hostapd_scan_results_updated(struct hostapd_iface *iface)
+{
+	if (!iface->wait_channel_update)
 		return;
 
-	wpa_printf(MSG_DEBUG, "Channel list updated - continue setup");
+	wpa_printf(MSG_DEBUG, "Scan results updated - continue setup");
 	eloop_cancel_timeout(channel_list_update_timeout, iface, NULL);
 	setup_interface2(iface);
 }
@@ -2064,7 +2068,8 @@
 		if (os_strncmp(previous_country, country, 2) != 0) {
 			wpa_printf(MSG_DEBUG, "Continue interface setup after channel list update");
 			iface->wait_channel_update = 1;
-			eloop_register_timeout(5, 0,
+			int timeout = hostapd_scan_region_before_setting_channel(iface, NULL) ? 10 : 5;
+			eloop_register_timeout(timeout, 0,
 					       channel_list_update_timeout,
 					       iface, NULL);
 			return 0;
Index: src/ap/hw_features.h
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/ap/hw_features.h b/src/ap/hw_features.h
--- a/src/ap/hw_features.h	(revision e7172e26d3ebe962150a2e579e40d3a69e8f7304)
+++ b/src/ap/hw_features.h	(date 1721057961231)
@@ -21,6 +21,7 @@
 const char * hostapd_hw_mode_txt(int mode);
 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan);
 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq);
+int hostapd_scan_region_before_setting_channel(struct hostapd_iface *iface, void *ctx);
 int hostapd_check_ht_capab(struct hostapd_iface *iface);
 int hostapd_check_edmg_capab(struct hostapd_iface *iface);
 int hostapd_check_he_6ghz_capab(struct hostapd_iface *iface);
Index: src/ap/hw_features.c
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/ap/hw_features.c b/src/ap/hw_features.c
--- a/src/ap/hw_features.c	(revision e7172e26d3ebe962150a2e579e40d3a69e8f7304)
+++ b/src/ap/hw_features.c	(date 1721241733664)
@@ -42,6 +42,14 @@
 }
 
 
+static void ieee80211n_region_scan_complete(struct hostapd_iface *iface)
+{
+	iface->scan_cb = NULL;
+	wpa_printf(MSG_DEBUG, "Region scan completed");
+	hostapd_scan_results_updated(iface);
+}
+
+
 #ifndef CONFIG_NO_STDOUT_DEBUG
 static char * dfs_info(struct hostapd_channel_data *chan)
 {
@@ -85,6 +93,10 @@
 
 	if (hostapd_drv_none(hapd))
 		return -1;
+
+	if (iface->scan_cb == ieee80211n_region_scan_complete)
+		return -1;
+
 	modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags,
 					    &dfs_domain);
 	if (modes == NULL) {
@@ -539,6 +551,34 @@
 }
 
 
+int hostapd_scan_region_before_setting_channel(struct hostapd_iface *iface, void *ctx)
+{
+	struct wpa_driver_scan_params params;
+	int ret;
+
+	if (iface->scan_cb == ieee80211n_region_scan_complete)
+		return 0;
+
+	if (iface->conf->hw_mode_set && iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211A)
+		ieee80211n_scan_channels_5g(iface, &params);
+	else
+		ieee80211n_scan_channels_2g4(iface, &params);
+
+	os_memset(&params, 0, sizeof(params));
+	ret = hostapd_driver_scan(iface->bss[0], &params);
+    if (ret == -EBUSY) {
+        wpa_printf(MSG_ERROR,
+                   "Failed to request a scan of neighboring BSSes ret=%d (%s)!",
+                   ret, strerror(-ret));
+		return 0;
+    }
+    if (ret == 0)
+	    iface->scan_cb = ieee80211n_region_scan_complete;
+
+	return 1;
+}
+
+
 void hostapd_stop_setup_timers(struct hostapd_iface *iface)
 {
 	eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
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