recipes-wifi/hostapd/files/patches-2.10.3/0007-hostapd-ap-add-AFC-client-support.patch

From 3bd1d33a94f25337fd70df60ee5a42a60f95cba9 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Fri, 17 May 2024 11:50:27 +0200
Subject: [PATCH 007/126] hostapd: ap: add AFC client support

Introduce Automated Frequency Coordination (AFC) support for UNII-5 and
UNII-7 6GHz bands.
AFC client will connect to AFCD providing AP related parameter for AFC
coordinator (e.g. geolocation, supported frequencies, ..).
AFC is required for Standard Power Devices (SPDs) to determine a lists
of channels and EIRP/PSD powers that are available in the 6GHz spectrum.
AFC hostapd client is tested with AFC DUT Test Harness [0].

[0] https://github.com/Wi-FiTestSuite/AFC-DUT/tree/main

Tested-by: Felix Fietkau <nbd@nbd.name>
Tested-by: Allen Ye <allen.ye@mediatek.com>
Tested-by: Krishna Chaitanya <chaitanya.mgit@gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 hostapd/Makefile      |    8 +
 hostapd/config_file.c |  261 +++++++++++
 hostapd/defconfig     |    3 +
 hostapd/hostapd.conf  |   42 ++
 src/ap/afc.c          | 1041 +++++++++++++++++++++++++++++++++++++++++
 src/ap/ap_config.c    |   16 +
 src/ap/ap_config.h    |   47 ++
 src/ap/hostapd.c      |   16 +
 src/ap/hostapd.h      |   45 ++
 src/ap/hw_features.c  |    2 +
 10 files changed, 1481 insertions(+)
 create mode 100644 src/ap/afc.c

diff --git a/hostapd/Makefile b/hostapd/Makefile
index ca4439234..78171025e 100644
--- a/hostapd/Makefile
+++ b/hostapd/Makefile
@@ -104,6 +104,14 @@ CFLAGS += -DCONFIG_TAXONOMY
 OBJS += ../src/ap/taxonomy.o
 endif
 
+ifdef CONFIG_IEEE80211AX
+ifdef CONFIG_AFC
+CFLAGS += -DCONFIG_AFC
+OBJS += ../src/ap/afc.o
+LIBS += -ljson-c
+endif
+endif
+
 ifdef CONFIG_MODULE_TESTS
 CFLAGS += -DCONFIG_MODULE_TESTS
 OBJS += hapd_module_tests.o
diff --git a/hostapd/config_file.c b/hostapd/config_file.c
index 96f1b1749..a86621ed9 100644
--- a/hostapd/config_file.c
+++ b/hostapd/config_file.c
@@ -1281,6 +1281,190 @@ static int hostapd_parse_he_srg_bitmap(u8 *bitmap, char *val)
 	return 0;
 }
 
+
+#ifdef CONFIG_AFC
+static int hostapd_afc_parse_cert_ids(struct hostapd_config *conf, char *pos)
+{
+	struct cert_id *c = NULL;
+	int i, count = 0;
+
+	while (pos && pos[0]) {
+		char *p;
+
+		c = os_realloc_array(c, count + 1, sizeof(*c));
+		if (!c)
+			return -ENOMEM;
+
+		i = count;
+		count++;
+
+		p = os_strchr(pos, ':');
+		if (!p)
+			goto error;
+
+		*p++ = '\0';
+		if (!p || !p[0])
+			goto error;
+
+		c[i].rulset = os_malloc(os_strlen(pos) + 1);
+		if (!c[i].rulset)
+			goto error;
+
+		os_strlcpy(c[i].rulset, pos, os_strlen(pos) + 1);
+		pos = p;
+		p = os_strchr(pos, ',');
+		if (p)
+			*p++ = '\0';
+
+		c[i].id = os_malloc(os_strlen(pos) + 1);
+		if (!c[i].id)
+			goto error;
+
+		os_strlcpy(c[i].id, pos, os_strlen(pos) + 1);
+		pos = p;
+	}
+
+	conf->afc.n_cert_ids = count;
+	conf->afc.cert_ids = c;
+
+	return 0;
+
+error:
+	for (i = 0; i < count; i++) {
+		os_free(c[i].rulset);
+		os_free(c[i].id);
+	}
+	os_free(c);
+
+	return -ENOMEM;
+}
+
+
+static int hostapd_afc_parse_position_data(struct afc_linear_polygon **data,
+					   unsigned int *n_linear_polygon_data,
+					   char *pos)
+{
+	struct afc_linear_polygon *d = NULL;
+	int i, count = 0;
+
+	while (pos && pos[0]) {
+		char *p, *end;
+
+		d = os_realloc_array(d, count + 1, sizeof(*d));
+		if (!d)
+			return -ENOMEM;
+
+		i = count;
+		count++;
+
+		p = os_strchr(pos, ':');
+		if (!p)
+			goto error;
+
+		*p++ = '\0';
+		if (!p || !p[0])
+			goto error;
+
+		d[i].longitude = strtod(pos, &end);
+		if (*end)
+			goto error;
+
+		pos = p;
+		p = os_strchr(pos, ',');
+		if (p)
+			*p++ = '\0';
+
+		d[i].latitude = strtod(pos, &end);
+		if (*end)
+			goto error;
+
+		pos = p;
+	}
+
+	*n_linear_polygon_data = count;
+	*data = d;
+
+	return 0;
+
+error:
+	os_free(d);
+	return -ENOMEM;
+}
+
+
+static int hostapd_afc_parse_freq_range(struct hostapd_config *conf, char *pos)
+{
+	struct afc_freq_range *f = NULL;
+	int i, count = 0;
+
+	while (pos && pos[0]) {
+		char *p;
+
+		f = os_realloc_array(f, count + 1, sizeof(*f));
+		if (!f)
+			return -ENOMEM;
+
+		i = count;
+		count++;
+
+		p = os_strchr(pos, ':');
+		if (!p)
+			goto error;
+
+		*p++ = '\0';
+		if (!p || !p[0])
+			goto error;
+
+		f[i].low_freq = atoi(pos);
+		pos = p;
+		p = os_strchr(pos, ',');
+		if (p)
+			*p++ = '\0';
+
+		f[i].high_freq = atoi(pos);
+		pos = p;
+	}
+
+	conf->afc.n_freq_range = count;
+	conf->afc.freq_range = f;
+
+	return 0;
+
+error:
+	os_free(f);
+	return -ENOMEM;
+}
+
+
+static int hostapd_afc_parse_op_class(struct hostapd_config *conf, char *pos)
+{
+	unsigned int *oc = NULL;
+	int i, count = 0;
+
+	while (pos && pos[0]) {
+		char *p;
+
+		oc = os_realloc_array(oc, count + 1, sizeof(*oc));
+		if (!oc)
+			return -ENOMEM;
+
+		i = count;
+		count++;
+
+		p = os_strchr(pos, ',');
+		if (p)
+			*p++ = '\0';
+
+		oc[i] = atoi(pos);
+		pos = p;
+	}
+
+	conf->afc.n_op_class = count;
+	conf->afc.op_class = oc;
+
+	return 0;
+}
+#endif /* CONFIG_AFC */
 #endif /* CONFIG_IEEE80211AX */
 
 
@@ -3955,6 +4139,83 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 			return 1;
 		}
 		bss->unsol_bcast_probe_resp_interval = val;
+#ifdef CONFIG_AFC
+	} else if (os_strcmp(buf, "afcd_sock") == 0) {
+		conf->afc.socket = os_malloc(os_strlen(pos) + 1);
+		if (!conf->afc.socket)
+			return 1;
+
+		os_strlcpy(conf->afc.socket, pos, os_strlen(pos) + 1);
+	} else if (os_strcmp(buf, "afc_request_version") == 0) {
+		conf->afc.request.version = os_malloc(os_strlen(pos) + 1);
+		if (!conf->afc.request.version)
+			return 1;
+
+		os_strlcpy(conf->afc.request.version, pos, os_strlen(pos) + 1);
+	} else if (os_strcmp(buf, "afc_request_id") == 0) {
+		conf->afc.request.id = os_malloc(os_strlen(pos) + 1);
+		if (!conf->afc.request.id)
+			return 1;
+
+		os_strlcpy(conf->afc.request.id, pos, os_strlen(pos) + 1);
+	} else if (os_strcmp(buf, "afc_serial_number") == 0) {
+		conf->afc.request.sn = os_malloc(os_strlen(pos) + 1);
+		if (!conf->afc.request.sn)
+			return 1;
+
+		os_strlcpy(conf->afc.request.sn, pos, os_strlen(pos) + 1);
+	} else if (os_strcmp(buf, "afc_cert_ids") == 0) {
+		if (hostapd_afc_parse_cert_ids(conf, pos))
+			return 1;
+	} else if (os_strcmp(buf, "afc_location_type") == 0) {
+		conf->afc.location.type = atoi(pos);
+		if (conf->afc.location.type != ELLIPSE &&
+		    conf->afc.location.type != LINEAR_POLYGON &&
+		    conf->afc.location.type != RADIAL_POLYGON)
+			return 1;
+	} else if (os_strcmp(buf, "afc_linear_polygon") == 0) {
+		if (hostapd_afc_parse_position_data(
+			&conf->afc.location.linear_polygon_data,
+			&conf->afc.location.n_linear_polygon_data,
+			pos))
+			return 1;
+	} else if (os_strcmp(buf, "afc_radial_polygon") == 0) {
+		if (hostapd_afc_parse_position_data(
+			(struct afc_linear_polygon **)
+			&conf->afc.location.radial_polygon_data,
+			&conf->afc.location.n_radial_polygon_data,
+			pos))
+			return 1;
+	} else if (os_strcmp(buf, "afc_major_axis") == 0) {
+		conf->afc.location.major_axis = atoi(pos);
+	} else if (os_strcmp(buf, "afc_minor_axis") == 0) {
+		conf->afc.location.minor_axis = atoi(pos);
+	} else if (os_strcmp(buf, "afc_orientation") == 0) {
+		conf->afc.location.orientation = atoi(pos);
+	} else if (os_strcmp(buf, "afc_height") == 0) {
+		char *end;
+
+		conf->afc.location.height = strtod(pos, &end);
+		if (*end)
+			return 1;
+	} else if (os_strcmp(buf, "afc_height_type") == 0) {
+		conf->afc.location.height_type = os_malloc(os_strlen(pos) + 1);
+		if (!conf->afc.location.height_type)
+			return 1;
+
+		os_strlcpy(conf->afc.location.height_type, pos,
+			   os_strlen(pos) + 1);
+	} else if (os_strcmp(buf, "afc_vertical_tolerance") == 0) {
+		conf->afc.location.vertical_tolerance = atoi(pos);
+	} else if (os_strcmp(buf, "afc_min_power") == 0) {
+		conf->afc.min_power = atoi(pos);
+	} else if (os_strcmp(buf, "afc_freq_range") == 0) {
+		if (hostapd_afc_parse_freq_range(conf, pos))
+			return 1;
+	} else if (os_strcmp(buf, "afc_op_class") == 0) {
+		if (hostapd_afc_parse_op_class(conf, pos))
+			return 1;
+#endif /* CONFIG_AFC */
 	} else if (os_strcmp(buf, "mbssid") == 0) {
 		int mbssid = atoi(pos);
 		if (mbssid < 0 || mbssid > ENHANCED_MBSSID_ENABLED) {
diff --git a/hostapd/defconfig b/hostapd/defconfig
index 550db697b..66bf894eb 100644
--- a/hostapd/defconfig
+++ b/hostapd/defconfig
@@ -425,3 +425,6 @@ CONFIG_DPP2=y
 
 # Wi-Fi Aware unsynchronized service discovery (NAN USD)
 #CONFIG_NAN_USD=y
+
+# Enable Automated Frequency Coordination for 6GHz outdoor
+#CONFIG_AFC=y
diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
index 93524cf5d..56442c69d 100644
--- a/hostapd/hostapd.conf
+++ b/hostapd/hostapd.conf
@@ -1030,6 +1030,48 @@ wmm_ac_vo_acm=0
 # Valid range: 0..20 TUs; default is 0 (disabled)
 #unsol_bcast_probe_resp_interval=0
 
+##### Automated Frequency Coordination for 6GHz UNII-5 and UNII-7 bands #######
+
+# AFC daemon connection socket
+#afcd_sock=/var/run/afcd.sock
+
+# AFC request identification parameters
+#afc_request_version=1.1
+#afc_request_id=11235813
+#afc_serial_number=abcdefg
+#afc_cert_ids=US_47_CFR_PART_15_SUBPART_E:CID000
+#
+# AFC location type:
+# 0 = ellipse
+# 1 = linear polygon
+# 2 = radial polygon
+#afc_location_type=0
+#
+# AFC ellipse or linear polygon coordinations
+#afc_linear_polygon=-122.984157:37.425056
+#
+# AFC radial polygon coordinations
+#afc_radial_polygon=118.8:92.76,76.44:87.456,98.56:123.33
+#
+# AFC ellipse major/minor axis and orientation
+#afc_major_axis=100
+#afc_minor_axis=50
+#afc_orientation=70
+#
+# AFC device elevation parameters
+#afc_height=3.0
+#afc_height_type=AGL
+#afc_vertical_tolerance=7
+#
+# AFC minimum desired TX power (dbm)
+#afc_min_power=24
+#
+# AFC request frequency ranges
+#afc_freq_range=5925:6425,6525:6875
+#
+# AFC request operation classes
+#afc_op_class=131,132,133,134,136
+
 ##### IEEE 802.11be related configuration #####################################
 
 #ieee80211be: Whether IEEE 802.11be (EHT) is enabled
diff --git a/src/ap/afc.c b/src/ap/afc.c
new file mode 100644
index 000000000..cfee83fe7
--- /dev/null
+++ b/src/ap/afc.c
@@ -0,0 +1,1041 @@
+/*
+ * Automated Frequency Coordination
+ * Copyright (c) 2024, Lorenzo Bianconi <lorenzo@kernel.org>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include <json-c/json.h>
+#include <sys/un.h>
+#include <time.h>
+
+#include "utils/includes.h"
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "hostapd.h"
+#include "acs.h"
+#include "hw_features.h"
+
+#define HOSTAPD_AFC_RETRY_TIMEOUT	180
+#define HOSTAPD_AFC_TIMEOUT		86400 /* 24h */
+#define HOSTAPD_AFC_BUFSIZE		8192
+
+static void hostapd_afc_timeout_handler(void *eloop_ctx, void *timeout_ctx);
+
+
+static struct json_object *
+hostapd_afc_build_location_request(struct hostapd_iface *iface)
+{
+	struct json_object *location_obj, *center_obj, *ellipse_obj;
+	struct json_object *elevation_obj, *str_obj;
+	struct hostapd_config *iconf = iface->conf;
+	bool is_ap_indoor = he_reg_is_indoor(iconf->he_6ghz_reg_pwr_type);
+
+	location_obj = json_object_new_object();
+	if (!location_obj)
+		return NULL;
+
+	if (iconf->afc.location.type != LINEAR_POLYGON) {
+		struct afc_linear_polygon *lp =
+			&iconf->afc.location.linear_polygon_data[0];
+
+		if (!lp)
+			goto error;
+
+		ellipse_obj = json_object_new_object();
+		if (!ellipse_obj)
+			goto error;
+
+		center_obj = json_object_new_object();
+		if (!center_obj)
+			goto error;
+
+		json_object_object_add(ellipse_obj, "center", center_obj);
+
+		str_obj = json_object_new_double(lp->longitude);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(center_obj, "longitude", str_obj);
+		str_obj = json_object_new_double(lp->latitude);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(center_obj, "latitude", str_obj);
+	}
+
+	switch (iconf->afc.location.type) {
+	case LINEAR_POLYGON: {
+		struct json_object *outer_boundary_obj;
+		int i;
+
+		outer_boundary_obj = json_object_new_object();
+		if (!outer_boundary_obj)
+			goto error;
+
+		json_object_object_add(location_obj, "linearPolygon",
+				       outer_boundary_obj);
+		ellipse_obj = json_object_new_array();
+		if (!ellipse_obj)
+			goto error;
+
+		json_object_object_add(outer_boundary_obj, "outerBoundary",
+				       ellipse_obj);
+		for (i = 0;
+		     i < iconf->afc.location.n_linear_polygon_data; i++) {
+			struct afc_linear_polygon *lp =
+				&iconf->afc.location.linear_polygon_data[i];
+
+			center_obj = json_object_new_object();
+			if (!center_obj)
+				goto error;
+
+			json_object_array_add(ellipse_obj, center_obj);
+			str_obj = json_object_new_double(lp->longitude);
+			if (!str_obj)
+				goto error;
+
+			json_object_object_add(center_obj, "longitude",
+					       str_obj);
+			str_obj = json_object_new_double(lp->latitude);
+			if (!str_obj)
+				goto error;
+
+			json_object_object_add(center_obj, "latitude",
+					       str_obj);
+		}
+		break;
+	}
+	case RADIAL_POLYGON: {
+		struct json_object *outer_boundary_obj;
+		int i;
+
+		json_object_object_add(location_obj, "radialPolygon",
+				       ellipse_obj);
+
+		outer_boundary_obj = json_object_new_array();
+		if (!outer_boundary_obj)
+			goto error;
+
+		json_object_object_add(ellipse_obj, "outerBoundary",
+				       outer_boundary_obj);
+		for (i = 0;
+		     i < iconf->afc.location.n_radial_polygon_data; i++) {
+			struct afc_radial_polygon *rp =
+				&iconf->afc.location.radial_polygon_data[i];
+			struct json_object *angle_obj;
+
+			angle_obj = json_object_new_object();
+			if (!angle_obj)
+				goto error;
+
+			json_object_array_add(outer_boundary_obj, angle_obj);
+
+			str_obj = json_object_new_double(rp->angle);
+			if (!str_obj)
+				goto error;
+
+			json_object_object_add(angle_obj, "angle", str_obj);
+			str_obj = json_object_new_double(rp->length);
+			if (!str_obj)
+				goto error;
+
+			json_object_object_add(angle_obj, "length", str_obj);
+		}
+		break;
+	}
+	case ELLIPSE:
+	default:
+		json_object_object_add(location_obj, "ellipse", ellipse_obj);
+
+		str_obj = json_object_new_int(iconf->afc.location.major_axis);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(ellipse_obj, "majorAxis", str_obj);
+		str_obj = json_object_new_int(iconf->afc.location.minor_axis);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(ellipse_obj, "minorAxis", str_obj);
+		str_obj = json_object_new_int(iconf->afc.location.orientation);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(ellipse_obj, "orientation", str_obj);
+		break;
+	}
+
+	elevation_obj = json_object_new_object();
+	if (!elevation_obj)
+		goto error;
+
+	json_object_object_add(location_obj, "elevation",
+			       elevation_obj);
+	str_obj = json_object_new_double(iconf->afc.location.height);
+	if (!str_obj)
+		goto error;
+
+	json_object_object_add(elevation_obj, "height", str_obj);
+	if (iconf->afc.location.height_type) {
+		str_obj = json_object_new_string(iconf->afc.location.height_type);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(elevation_obj, "heightType", str_obj);
+	}
+
+	str_obj = json_object_new_int(iconf->afc.location.vertical_tolerance);
+	if (!str_obj)
+		goto error;
+
+	json_object_object_add(elevation_obj, "verticalUncertainty",
+			       str_obj);
+	str_obj = json_object_new_int(is_ap_indoor);
+	if (!str_obj)
+		goto error;
+
+	json_object_object_add(location_obj, "indoorDeployment", str_obj);
+
+	return location_obj;
+
+error:
+	json_object_put(location_obj);
+	return NULL;
+}
+
+
+static struct json_object * hostapd_afc_get_opclass_chan_list(u8 op_class)
+{
+	struct json_object *chan_list_obj, *str_obj;
+	const struct oper_class_map *oper_class;
+	int chan_offset, chan;
+
+	oper_class = get_oper_class(NULL, op_class);
+	if (!oper_class)
+		return NULL;
+
+	chan_list_obj = json_object_new_array();
+	if (!chan_list_obj)
+		return NULL;
+
+	switch (op_class) {
+	case 132: /*  40MHz */
+		chan_offset = 2;
+		break;
+	case 133: /*  80MHz */
+		chan_offset = 6;
+		break;
+	case 134: /* 160MHz */
+		chan_offset = 14;
+		break;
+	default:
+		chan_offset = 0;
+		break;
+	}
+
+	for (chan = oper_class->min_chan; chan <= oper_class->max_chan;
+	     chan += oper_class->inc) {
+		str_obj = json_object_new_int(chan + chan_offset);
+		if (!str_obj) {
+			json_object_put(chan_list_obj);
+			return NULL;
+		}
+		json_object_array_add(chan_list_obj, str_obj);
+	}
+
+	return chan_list_obj;
+}
+
+
+static struct json_object *
+hostapd_afc_build_req_chan_list(struct hostapd_iface *iface)
+{
+	struct json_object *op_class_list_obj, *str_obj;
+	struct hostapd_config *iconf = iface->conf;
+	int i;
+
+	op_class_list_obj = json_object_new_array();
+	if (!op_class_list_obj)
+		return NULL;
+
+	for (i = 0; i < iconf->afc.n_op_class; i++) {
+		struct json_object *op_class_obj, *chan_list_obj;
+		u8 op_class = iconf->afc.op_class[i];
+
+		if (!is_6ghz_op_class(op_class))
+			continue;
+
+		op_class_obj = json_object_new_object();
+		if (!op_class_obj)
+			goto error;
+
+		json_object_array_add(op_class_list_obj, op_class_obj);
+		str_obj = json_object_new_int(op_class);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(op_class_obj, "globalOperatingClass",
+				       str_obj);
+
+		chan_list_obj = hostapd_afc_get_opclass_chan_list(op_class);
+		if (!chan_list_obj)
+			goto error;
+
+		json_object_object_add(op_class_obj, "channelCfi",
+				       chan_list_obj);
+	}
+
+	return op_class_list_obj;
+
+error:
+	json_object_put(op_class_list_obj);
+	return NULL;
+}
+
+
+static struct json_object *
+hostapd_afc_build_request(struct hostapd_iface *iface)
+{
+	struct json_object *l1_obj, *l2_obj, *la1_obj, *la2_obj;
+	struct json_object *s2_obj, *str_obj, *location_obj;
+	struct hostapd_config *iconf = iface->conf;
+	struct json_object *op_class_list_obj;
+	int i;
+
+	l1_obj = json_object_new_object();
+	if (!l1_obj)
+		return NULL;
+
+	if (iconf->afc.request.version) {
+		str_obj = json_object_new_string(iconf->afc.request.version);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(l1_obj, "version", str_obj);
+	}
+
+	la1_obj = json_object_new_array();
+	if (!la1_obj)
+		goto error;
+
+	json_object_object_add(l1_obj, "availableSpectrumInquiryRequests",
+			       la1_obj);
+	l2_obj = json_object_new_object();
+	if (!l2_obj)
+		goto error;
+
+	json_object_array_add(la1_obj, l2_obj);
+	if (iconf->afc.request.id) {
+		str_obj = json_object_new_string(iconf->afc.request.id);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(l2_obj, "requestId", str_obj);
+	}
+
+	s2_obj = json_object_new_object();
+	if (!s2_obj)
+		goto error;
+
+	json_object_object_add(l2_obj, "deviceDescriptor", s2_obj);
+	if (iconf->afc.request.sn) {
+		str_obj = json_object_new_string(iconf->afc.request.sn);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(s2_obj, "serialNumber", str_obj);
+	}
+
+	la2_obj = json_object_new_array();
+	if (!la2_obj)
+		goto error;
+
+	json_object_object_add(s2_obj, "certificationId", la2_obj);
+	for (i = 0; i < iconf->afc.n_cert_ids; i++) {
+		struct json_object *obj;
+
+		obj = json_object_new_object();
+		if (!obj)
+			goto error;
+
+		json_object_array_add(la2_obj, obj);
+		str_obj =
+			json_object_new_string(iconf->afc.cert_ids[i].rulset);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(obj, "rulesetId", str_obj);
+		str_obj = json_object_new_string(iconf->afc.cert_ids[i].id);
+		if (!str_obj)
+			goto error;
+
+		json_object_object_add(obj, "id", str_obj);
+	}
+
+	location_obj = hostapd_afc_build_location_request(iface);
+	if (!location_obj)
+		goto error;
+
+	json_object_object_add(l2_obj, "location", location_obj);
+	str_obj = json_object_new_int(iconf->afc.min_power);
+	if (!str_obj)
+		goto error;
+
+	json_object_object_add(l2_obj, "minDesiredPower", str_obj);
+
+	if (iconf->afc.n_freq_range) {
+		struct json_object *freq_obj;
+
+		freq_obj = json_object_new_array();
+		if (!freq_obj)
+			goto error;
+
+		json_object_object_add(l2_obj, "inquiredFrequencyRange",
+				       freq_obj);
+		for (i = 0; i < iconf->afc.n_freq_range; i++) {
+			struct afc_freq_range *fr = &iconf->afc.freq_range[i];
+			struct json_object *obj;
+
+			obj = json_object_new_object();
+			if (!obj)
+				goto error;
+
+			json_object_array_add(freq_obj, obj);
+			str_obj = json_object_new_int(fr->low_freq);
+			if (!str_obj)
+				goto error;
+
+			json_object_object_add(obj, "lowFrequency", str_obj);
+			str_obj = json_object_new_int(fr->high_freq);
+			if (!str_obj)
+				goto error;
+
+			json_object_object_add(obj, "highFrequency", str_obj);
+		}
+	}
+
+	op_class_list_obj = hostapd_afc_build_req_chan_list(iface);
+	if (!op_class_list_obj)
+		goto error;
+
+	json_object_object_add(l2_obj, "inquiredChannels", op_class_list_obj);
+
+	wpa_printf(MSG_DEBUG, "Pending AFC request: %s",
+		   json_object_get_string(l1_obj));
+
+	return l1_obj;
+
+error:
+	json_object_put(l1_obj);
+
+	return NULL;
+}
+
+
+static int
+hostad_afc_parse_available_freq_info(struct hostapd_iface *iface,
+				     struct json_object *reply_elem_obj)
+{
+	struct afc_freq_range_elem *f = NULL;
+	struct json_object *obj;
+	int i, count = 0;
+
+	if (!json_object_object_get_ex(reply_elem_obj,
+				       "availableFrequencyInfo", &obj))
+		return 0;
+
+	for (i = 0; i < json_object_array_length(obj); i++) {
+		struct json_object *range_elem_obj, *freq_range_obj;
+		struct json_object *high_freq_obj, *low_freq_obj;
+		struct json_object *max_psd_obj;
+
+		range_elem_obj = json_object_array_get_idx(obj, i);
+		if (!range_elem_obj)
+			continue;
+
+		if (!json_object_object_get_ex(range_elem_obj,
+					       "frequencyRange",
+					       &freq_range_obj))
+			continue;
+
+		if (!json_object_object_get_ex(freq_range_obj,
+					       "lowFrequency",
+					       &low_freq_obj))
+			continue;
+
+		if (!json_object_object_get_ex(freq_range_obj,
+					       "highFrequency",
+					       &high_freq_obj))
+			continue;
+
+		if (!json_object_object_get_ex(range_elem_obj, "maxPsd",
+					       &max_psd_obj) &&
+		    !json_object_object_get_ex(range_elem_obj, "maxPSD",
+					       &max_psd_obj))
+			continue;
+
+		f = os_realloc_array(f, count + 1, sizeof(*f));
+		if (!f)
+			return -ENOMEM;
+
+		f[count].low_freq = json_object_get_int(low_freq_obj);
+		f[count].high_freq = json_object_get_int(high_freq_obj);
+		f[count++].max_psd = json_object_get_int(max_psd_obj);
+	}
+	iface->afc.freq_range = f;
+	iface->afc.num_freq_range = count;
+
+	return 0;
+}
+
+
+static int hostad_afc_update_chan_info(struct afc_chan_info_elem **chan_list,
+				       int *chan_list_size, u8 op_class,
+				       int center_chan, int power)
+{
+	int num_low_subchan, ch, count = *chan_list_size;
+	struct afc_chan_info_elem *c = *chan_list;
+
+	switch (op_class) {
+	case 132: /*  40MHz */
+		num_low_subchan = 2;
+		break;
+	case 133: /*  80MHz */
+		num_low_subchan = 6;
+		break;
+	case 134: /* 160MHz */
+		num_low_subchan = 14;
+		break;
+	default:
+		num_low_subchan = 0;
+		break;
+	}
+
+	for (ch = center_chan - num_low_subchan;
+	     ch <= center_chan + num_low_subchan; ch += 4) {
+		int i;
+
+		for (i = 0; i < count; i++) {
+			if (c[i].chan == ch)
+				break;
+		}
+
+		if (i == count) {
+			c = os_realloc_array(c, count + 1, sizeof(*c));
+			if (!c)
+				return -ENOMEM;
+
+			c[count].chan = ch;
+			c[count++].power = power;
+		}
+	}
+
+	*chan_list_size = count;
+	*chan_list = c;
+
+	return 0;
+}
+
+
+static int
+hostad_afc_parse_available_chan_info(struct hostapd_iface *iface,
+				     struct json_object *reply_elem_obj)
+{
+	struct afc_chan_info_elem *c = NULL;
+	struct json_object *obj;
+	int i, count = 0;
+
+	if (!json_object_object_get_ex(reply_elem_obj,
+				       "availableChannelInfo", &obj))
+		return 0;
+
+	for (i = 0; i < json_object_array_length(obj); i++) {
+		struct json_object *range_elem_obj, *op_class_obj;
+		struct json_object *chan_cfi_obj, *max_eirp_obj;
+		int ch, op_class;
+
+		range_elem_obj = json_object_array_get_idx(obj, i);
+		if (!range_elem_obj)
+			continue;
+
+		if (!json_object_object_get_ex(range_elem_obj,
+					       "globalOperatingClass",
+					       &op_class_obj))
+			continue;
+
+		if (!json_object_object_get_ex(range_elem_obj, "maxEirp",
+					       &max_eirp_obj))
+			continue;
+
+		if (!json_object_object_get_ex(range_elem_obj, "channelCfi",
+					       &chan_cfi_obj))
+			continue;
+
+		op_class = json_object_get_int(op_class_obj);
+		for (ch = 0;
+		     ch < json_object_array_length(chan_cfi_obj); ch++) {
+			struct json_object *pwr_obj;
+			struct json_object *ch_obj;
+			int channel, power;
+
+			ch_obj = json_object_array_get_idx(chan_cfi_obj, ch);
+			if (!ch_obj)
+				continue;
+
+			pwr_obj = json_object_array_get_idx(max_eirp_obj, ch);
+			if (!pwr_obj)
+				continue;
+
+			channel = json_object_get_int(ch_obj);
+			power = json_object_get_int(pwr_obj);
+
+			hostad_afc_update_chan_info(&c, &count, op_class,
+						    channel, power);
+		}
+		iface->afc.chan_info_list = c;
+		iface->afc.num_chan_info = count;
+	}
+
+	return 0;
+}
+
+
+static int hostad_afc_get_timeout(struct json_object *obj)
+{
+	time_t t, now;
+	struct tm tm;
+
+	if (sscanf(json_object_get_string(obj), "%d-%d-%dT%d:%d:%dZ",
+		   &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
+		   &tm.tm_min, &tm.tm_sec) <= 0)
+		return HOSTAPD_AFC_TIMEOUT;
+
+	tm.tm_year -= 1900;
+	tm.tm_mon -= 1;
+	tm.tm_isdst = -1;
+	t = mktime(&tm);
+	time(&now);
+
+	return now > t ? HOSTAPD_AFC_RETRY_TIMEOUT : (t - now) * 80 / 100;
+}
+
+
+static int hostapd_afc_parse_reply(struct hostapd_iface *iface, char *reply)
+{
+	struct json_object *payload_obj, *reply_obj, *version_obj;
+	struct hostapd_config *iconf = iface->conf;
+	int i, request_timeout = -1, ret = -EINVAL;
+
+	wpa_printf(MSG_DEBUG, "Received AFC reply: %s", reply);
+	payload_obj = json_tokener_parse(reply);
+	if (!payload_obj) {
+		wpa_printf(MSG_ERROR, "Failed to parse AFC reply payload");
+		return -EINVAL;
+	}
+
+	if (!json_object_object_get_ex(payload_obj, "version", &version_obj)) {
+		wpa_printf(MSG_ERROR, "Missing version in AFC reply");
+		return -EINVAL;
+	}
+
+	if (iconf->afc.request.version &&
+	    os_strcmp(iconf->afc.request.version,
+		      json_object_get_string(version_obj))) {
+		wpa_printf(MSG_ERROR, "Mismatch in AFC reply version");
+		return -EINVAL;
+	}
+
+	if (!json_object_object_get_ex(payload_obj,
+				       "availableSpectrumInquiryResponses",
+				       &reply_obj)) {
+		wpa_printf(MSG_ERROR,
+			   "Missing availableSpectrumInquiry in AFC reply");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < json_object_array_length(reply_obj); i++) {
+		struct json_object *reply_elem_obj, *obj, *status_obj;
+		int j, status = -EINVAL;
+
+		reply_elem_obj = json_object_array_get_idx(reply_obj, i);
+		if (!reply_elem_obj) {
+			wpa_printf(MSG_DEBUG,
+				   "Failed to get reply element at index %d",
+				   i);
+			continue;
+		}
+
+		if (!json_object_object_get_ex(reply_elem_obj, "requestId",
+					       &obj)) {
+			wpa_printf(MSG_DEBUG,
+				   "Missing requestId in reply element %d", i);
+			continue;
+		}
+
+		if (iconf->afc.request.id &&
+		    os_strcmp(iconf->afc.request.id,
+			      json_object_get_string(obj))) {
+			wpa_printf(MSG_DEBUG,
+				   "RequestId mismatch in reply element %d",
+				   i);
+			continue;
+		}
+
+		if (!json_object_object_get_ex(reply_elem_obj, "rulesetId",
+					       &obj)) {
+			wpa_printf(MSG_DEBUG,
+				   "Missing rulesetId in reply element %d", i);
+			continue;
+		}
+
+		for (j = 0; j < iconf->afc.n_cert_ids; j++) {
+			if (!os_strcmp(iconf->afc.cert_ids[j].rulset,
+				       json_object_get_string(obj)))
+				break;
+		}
+
+		if (j == iconf->afc.n_cert_ids) {
+			wpa_printf(MSG_DEBUG,
+				   "RulesetId mismatch in reply element %d",
+				   i);
+			continue;
+		}
+
+		if (!json_object_object_get_ex(reply_elem_obj, "response",
+					       &obj)) {
+			wpa_printf(MSG_DEBUG,
+				   "Missing response field in reply element %d",
+				   i);
+			continue;
+		}
+
+		if (json_object_object_get_ex(obj, "shortDescription",
+					      &status_obj))
+			wpa_printf(MSG_DEBUG, "AFC reply element %d: %s",
+				   i, json_object_get_string(status_obj));
+
+		if (json_object_object_get_ex(obj, "responseCode",
+					      &status_obj))
+			status = json_object_get_int(status_obj);
+
+		if (status < 0) {
+			wpa_printf(MSG_DEBUG,
+				   "Reply element %d invalid responseCode: %d",
+				   i, status);
+			continue;
+		}
+
+		if (hostad_afc_parse_available_freq_info(iface,
+							 reply_elem_obj) ||
+		    hostad_afc_parse_available_chan_info(iface,
+							 reply_elem_obj))
+			continue;
+
+		if (json_object_object_get_ex(reply_elem_obj,
+					      "availabilityExpireTime",
+					      &obj)) {
+			int timeout = hostad_afc_get_timeout(obj);
+
+			if (request_timeout < 0 || timeout < request_timeout)
+				request_timeout = timeout;
+		}
+
+		ret = status;
+	}
+
+	iface->afc.data_valid = true;
+	iface->afc.timeout = request_timeout;
+	if (iface->afc.timeout < 0)
+		iface->afc.timeout = HOSTAPD_AFC_RETRY_TIMEOUT;
+
+	return ret;
+}
+
+
+static int hostapd_afc_send_receive(struct hostapd_iface *iface)
+{
+	struct hostapd_config *iconf = iface->conf;
+	json_object *request_obj = NULL;
+	struct timeval sock_timeout = {
+		.tv_sec = 5,
+	};
+	struct sockaddr_un addr = {
+		.sun_family = AF_UNIX,
+#ifdef __FreeBSD__
+		.sun_len = sizeof(addr),
+#endif /* __FreeBSD__ */
+	};
+	const char *request;
+	char *buf = NULL;
+	int sockfd, ret;
+	fd_set read_set;
+
+	if (iface->afc.data_valid) {
+		/* AFC data already downloaded from the server */
+		return 0;
+	}
+
+	if (!iconf->afc.socket) {
+		wpa_printf(MSG_ERROR, "Missing AFC socket string");
+		return -EINVAL;
+	}
+
+	iface->afc.timeout = HOSTAPD_AFC_RETRY_TIMEOUT;
+	if (os_strlen(iconf->afc.socket) >= sizeof(addr.sun_path)) {
+		wpa_printf(MSG_ERROR, "Malformed AFC socket string %s",
+			   iconf->afc.socket);
+		return -EINVAL;
+	}
+
+	os_strlcpy(addr.sun_path, iconf->afc.socket, sizeof(addr.sun_path));
+	sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (sockfd < 0) {
+		wpa_printf(MSG_ERROR, "Failed creating AFC socket");
+		return sockfd;
+	}
+
+	if (connect(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+		wpa_printf(MSG_ERROR, "Failed connecting AFC socket");
+		ret = -EIO;
+		goto close_sock;
+	}
+
+	request_obj = hostapd_afc_build_request(iface);
+	if (!request_obj) {
+		ret = -ENOMEM;
+		goto close_sock;
+	}
+
+	request = json_object_to_json_string(request_obj);
+	if (send(sockfd, request, strlen(request), 0) < 0) {
+		wpa_printf(MSG_ERROR, "Failed sending AFC request");
+		ret = -EIO;
+		goto close_sock;
+	}
+
+	FD_ZERO(&read_set);
+	FD_SET(sockfd, &read_set);
+	if (select(sockfd + 1, &read_set, NULL, NULL, &sock_timeout) < 0) {
+		wpa_printf(MSG_ERROR, "Select failed on AFC socket");
+		ret = -errno;
+		goto close_sock;
+	}
+
+	if (!FD_ISSET(sockfd, &read_set)) {
+		ret = -EIO;
+		goto close_sock;
+	}
+
+	buf = os_zalloc(HOSTAPD_AFC_BUFSIZE);
+	if (!buf) {
+		ret = -ENOMEM;
+		goto close_sock;
+	}
+
+	ret = recv(sockfd, buf, HOSTAPD_AFC_BUFSIZE - 1, 0);
+	if (ret <= 0)
+		goto close_sock;
+
+	ret = hostapd_afc_parse_reply(iface, buf);
+	if (ret)
+		wpa_printf(MSG_ERROR, "Failed parsing AFC reply: %d", ret);
+close_sock:
+	os_free(buf);
+	json_object_put(request_obj);
+	close(sockfd);
+
+	return ret;
+}
+
+
+static bool hostapd_afc_has_usable_chans(struct hostapd_iface *iface)
+{
+	const struct oper_class_map *oper_class;
+	int ch;
+
+	oper_class = get_oper_class(NULL, iface->conf->op_class);
+	if (!oper_class)
+		return false;
+
+	for (ch = oper_class->min_chan; ch <= oper_class->max_chan;
+	     ch += oper_class->inc) {
+		struct hostapd_hw_modes *mode = iface->current_mode;
+		int i;
+
+		for (i = 0; i < mode->num_channels; i++) {
+			struct hostapd_channel_data *chan = &mode->channels[i];
+
+			if (chan->chan == ch &&
+			    !(chan->flag & HOSTAPD_CHAN_DISABLED))
+				return true;
+		}
+	}
+
+	return false;
+}
+
+
+int hostapd_afc_handle_request(struct hostapd_iface *iface)
+{
+	struct hostapd_config *iconf = iface->conf;
+	int ret;
+
+	/* AFC is required just for standard power AP */
+	if (!he_reg_is_sp(iconf->he_6ghz_reg_pwr_type))
+		return 1;
+
+	if (!is_6ghz_op_class(iconf->op_class) || !is_6ghz_freq(iface->freq))
+		return 1;
+
+	if (iface->state == HAPD_IFACE_ACS)
+		return 1;
+
+	ret = hostapd_afc_send_receive(iface);
+	if (ret < 0) {
+		/*
+		 * If the connection to the AFCD failed, resched for a
+		 * future attempt.
+		 */
+		wpa_printf(MSG_ERROR, "AFC connection failed: %d", ret);
+		if (ret == -EIO)
+			ret = 0;
+		goto resched;
+	}
+
+	hostap_afc_disable_channels(iface);
+	if (!hostapd_afc_has_usable_chans(iface))
+		goto resched;
+
+	if (!hostapd_is_usable_chans(iface)) {
+		/* Trigger an ACS freq scan */
+		iconf->channel = 0;
+		iface->freq = 0;
+
+		if (acs_init(iface) != HOSTAPD_CHAN_ACS) {
+			wpa_printf(MSG_ERROR, "Could not start ACS");
+			ret = -EINVAL;
+		}
+	} else {
+		ret = 1;
+	}
+
+resched:
+	eloop_cancel_timeout(hostapd_afc_timeout_handler, iface, NULL);
+	eloop_register_timeout(iface->afc.timeout, 0,
+			       hostapd_afc_timeout_handler, iface, NULL);
+
+	return ret;
+}
+
+
+static void hostapd_afc_delete_data_from_server(struct hostapd_iface *iface)
+{
+	os_free(iface->afc.chan_info_list);
+	os_free(iface->afc.freq_range);
+
+	iface->afc.num_freq_range = 0;
+	iface->afc.num_chan_info = 0;
+
+	iface->afc.chan_info_list = NULL;
+	iface->afc.freq_range = NULL;
+
+	iface->afc.data_valid = false;
+}
+
+
+static void hostapd_afc_timeout_handler(void *eloop_ctx, void *timeout_ctx)
+{
+	struct hostapd_iface *iface = eloop_ctx;
+	bool restart_iface = true;
+
+	hostapd_afc_delete_data_from_server(iface);
+	if (iface->state != HAPD_IFACE_ENABLED) {
+		/* Hostapd is not fully enabled yet, toggle the interface */
+		goto restart_interface;
+	}
+
+	if (hostapd_afc_send_receive(iface) < 0 ||
+	    hostapd_get_hw_features(iface)) {
+		restart_iface = false;
+		goto restart_interface;
+	}
+
+	if (hostapd_is_usable_chans(iface))
+		goto resched;
+
+	restart_iface = hostapd_afc_has_usable_chans(iface);
+	if (restart_iface) {
+		/* Trigger an ACS freq scan */
+		iface->conf->channel = 0;
+		iface->freq = 0;
+	}
+
+restart_interface:
+	hostapd_disable_iface(iface);
+	if (restart_iface)
+		hostapd_enable_iface(iface);
+resched:
+	eloop_register_timeout(iface->afc.timeout, 0,
+			       hostapd_afc_timeout_handler, iface, NULL);
+}
+
+
+void hostapd_afc_stop(struct hostapd_iface *iface)
+{
+	eloop_cancel_timeout(hostapd_afc_timeout_handler, iface, NULL);
+}
+
+
+void hostap_afc_disable_channels(struct hostapd_iface *iface)
+{
+	struct hostapd_hw_modes *mode = NULL;
+	int i;
+
+	for (i = 0; i < iface->num_hw_features; i++) {
+		mode = &iface->hw_features[i];
+		if (mode->mode == HOSTAPD_MODE_IEEE80211A &&
+		    mode->is_6ghz)
+			break;
+	}
+
+	if (i == iface->num_hw_features)
+		return;
+
+	if (!he_reg_is_sp(iface->conf->he_6ghz_reg_pwr_type))
+		return;
+
+	if (!iface->afc.data_valid)
+		return;
+
+	for (i = 0; i < mode->num_channels; i++) {
+		struct hostapd_channel_data *chan = &mode->channels[i];
+		int j;
+
+		if (!is_6ghz_freq(chan->freq))
+			continue;
+
+		for (j = 0; j < iface->afc.num_freq_range; j++) {
+			if (chan->freq >= iface->afc.freq_range[j].low_freq &&
+			    chan->freq <= iface->afc.freq_range[j].high_freq)
+				break;
+		}
+
+		if (j != iface->afc.num_freq_range)
+			continue;
+
+		for (j = 0; j < iface->afc.num_chan_info; j++) {
+			if (chan->chan == iface->afc.chan_info_list[j].chan)
+				break;
+		}
+
+		if (j != iface->afc.num_chan_info)
+			continue;
+
+		chan->flag |= HOSTAPD_CHAN_DISABLED;
+		wpa_printf(MSG_MSGDUMP,
+			   "Disabling freq=%d MHz (not allowed by AFC)",
+			   chan->freq);
+	}
+}
diff --git a/src/ap/ap_config.c b/src/ap/ap_config.c
index c6aa49610..9e34e029a 100644
--- a/src/ap/ap_config.c
+++ b/src/ap/ap_config.c
@@ -1047,6 +1047,22 @@ void hostapd_config_free(struct hostapd_config *conf)
 #endif /* CONFIG_ACS */
 	wpabuf_free(conf->lci);
 	wpabuf_free(conf->civic);
+#ifdef CONFIG_AFC
+	os_free(conf->afc.socket);
+	os_free(conf->afc.request.version);
+	os_free(conf->afc.request.id);
+	os_free(conf->afc.request.sn);
+	for (i = 0; i < conf->afc.n_cert_ids; i++) {
+		os_free(conf->afc.cert_ids[i].rulset);
+		os_free(conf->afc.cert_ids[i].id);
+	}
+	os_free(conf->afc.cert_ids);
+	os_free(conf->afc.location.height_type);
+	os_free(conf->afc.location.linear_polygon_data);
+	os_free(conf->afc.location.radial_polygon_data);
+	os_free(conf->afc.freq_range);
+	os_free(conf->afc.op_class);
+#endif /* CONFIG_AFC */
 
 	os_free(conf);
 }
diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h
index d42076785..e6669e6a3 100644
--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -1249,6 +1249,53 @@ struct hostapd_config {
 
 	/* Whether to enable TWT responder in HT and VHT modes */
 	bool ht_vht_twt_responder;
+
+#ifdef CONFIG_AFC
+	struct {
+		char *socket;
+		struct {
+			char *version;
+			char *id;
+			char *sn;
+		} request;
+		unsigned int n_cert_ids;
+		struct cert_id {
+			char *rulset;
+			char *id;
+		} *cert_ids;
+		struct {
+			enum afc_location_type {
+				ELLIPSE,
+				LINEAR_POLYGON,
+				RADIAL_POLYGON,
+			} type;
+			unsigned int n_linear_polygon_data;
+			struct afc_linear_polygon {
+				double longitude;
+				double latitude;
+			} *linear_polygon_data;
+			unsigned int n_radial_polygon_data;
+			struct afc_radial_polygon {
+				double length;
+				double angle;
+			} *radial_polygon_data;
+			int major_axis;
+			int minor_axis;
+			int orientation;
+			double height;
+			char *height_type;
+			int vertical_tolerance;
+		} location;
+		unsigned int n_freq_range;
+		struct afc_freq_range {
+			int low_freq;
+			int high_freq;
+		} *freq_range;
+		unsigned int n_op_class;
+		unsigned int *op_class;
+		int min_power;
+	} afc;
+#endif /* CONFIG_AFC */
 };
 
 
diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
index 36d48ae09..5a8cdc90e 100644
--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -715,6 +715,7 @@ void hostapd_cleanup_iface_partial(struct hostapd_iface *iface)
 static void hostapd_cleanup_iface(struct hostapd_iface *iface)
 {
 	wpa_printf(MSG_DEBUG, "%s(%p)", __func__, iface);
+	hostapd_afc_stop(iface);
 	eloop_cancel_timeout(hostapd_interface_setup_failure_handler, iface,
 			     NULL);
 
@@ -2559,6 +2560,16 @@ static int hostapd_setup_interface_complete_sync(struct hostapd_iface *iface,
 		}
 #endif /* CONFIG_MESH */
 
+#ifdef CONFIG_IEEE80211AX
+		/* check AFC for 6GHz channels. */
+		res = hostapd_afc_handle_request(iface);
+		if (res <= 0) {
+			if (res < 0)
+				goto fail;
+			return res;
+		}
+#endif /* CONFIG_IEEE80211AX */
+
 		if (!delay_apply_cfg &&
 		    hostapd_set_freq(hapd, hapd->iconf->hw_mode, iface->freq,
 				     hapd->iconf->channel,
@@ -2957,6 +2968,7 @@ void hostapd_interface_deinit(struct hostapd_iface *iface)
 
 	hostapd_set_state(iface, HAPD_IFACE_DISABLED);
 
+	hostapd_afc_stop(iface);
 	eloop_cancel_timeout(channel_list_update_timeout, iface, NULL);
 	iface->wait_channel_update = 0;
 	iface->is_no_ir = false;
@@ -3030,6 +3042,10 @@ void hostapd_interface_free(struct hostapd_iface *iface)
 			   __func__, iface->bss[j]);
 		os_free(iface->bss[j]);
 	}
+#ifdef CONFIG_AFC
+	os_free(iface->afc.chan_info_list);
+	os_free(iface->afc.freq_range);
+#endif
 	hostapd_cleanup_iface(iface);
 }
 
diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
index 2ef63e5f2..d67a0afa0 100644
--- a/src/ap/hostapd.h
+++ b/src/ap/hostapd.h
@@ -718,9 +718,54 @@ struct hostapd_iface {
 	bool is_no_ir;
 
 	bool is_ch_switch_dfs; /* Channel switch from ACS to DFS */
+
+#ifdef CONFIG_AFC
+	struct {
+		int timeout;
+		unsigned int num_freq_range;
+		struct afc_freq_range_elem {
+			int low_freq;
+			int high_freq;
+			/**
+			 * max eirp power spectral density received from
+			 * the AFC coordinator for this band
+			 */
+			int max_psd;
+		} *freq_range;
+		unsigned int num_chan_info;
+		struct afc_chan_info_elem {
+			int chan;
+			/**
+			 * max eirp power received from the AFC coordinator
+			 * for this channel
+			 */
+			int power;
+		} *chan_info_list;
+		bool data_valid;
+	} afc;
+#endif /* CONFIG_AFC */
 };
 
 /* hostapd.c */
+#ifdef CONFIG_AFC
+int hostapd_afc_handle_request(struct hostapd_iface *iface);
+void hostapd_afc_stop(struct hostapd_iface *iface);
+void hostap_afc_disable_channels(struct hostapd_iface *iface);
+#else
+static inline int hostapd_afc_handle_request(struct hostapd_iface *iface)
+{
+	return 1;
+}
+
+static inline void hostapd_afc_stop(struct hostapd_iface *iface)
+{
+}
+
+static inline void hostap_afc_disable_channels(struct hostapd_iface *iface)
+{
+}
+#endif /* CONFIG_AFC */
+
 int hostapd_for_each_interface(struct hapd_interfaces *interfaces,
 			       int (*cb)(struct hostapd_iface *iface,
 					 void *ctx), void *ctx);
diff --git a/src/ap/hw_features.c b/src/ap/hw_features.c
index 85e67080d..8aa0b3ab5 100644
--- a/src/ap/hw_features.c
+++ b/src/ap/hw_features.c
@@ -114,6 +114,8 @@ int hostapd_get_hw_features(struct hostapd_iface *iface)
 	iface->hw_features = modes;
 	iface->num_hw_features = num_modes;
 
+	hostap_afc_disable_channels(iface);
+
 	for (i = 0; i < num_modes; i++) {
 		struct hostapd_hw_modes *feature = &modes[i];
 		int dfs_enabled = hapd->iconf->ieee80211h &&
-- 
2.18.0