[PATCH 1/2] AP: Unsolicited broadcast probe resp support

[Aloka Dixit <alokad@xxxxxxxxxxxxxx>]

This patch adds hostapd configuration options for unsolicited broadcast
probe response transmission for in-band discovery in 6GHz.
Maximum allowed packet interval is 20 TUs (IEEE P802.11ax/D6.0
26.17.2.3.2, AP behavior for fast passive scanning).
Setting value to 0 disables the transmission.

Signed-off-by: Aloka Dixit <alokad@xxxxxxxxxxxxxx>
---
 hostapd/config_file.c |  4 ++++
 hostapd/hostapd.conf  |  6 ++++++
 src/ap/ap_config.h    |  2 ++
 src/ap/beacon.c       | 21 +++++++++++++++++++++
 src/drivers/driver.h  | 15 +++++++++++++++
 5 files changed, 48 insertions(+)

diff --git a/hostapd/config_file.c b/hostapd/config_file.c
index 8f7fcd8b762c..d7bbb7141efc 100644
--- a/hostapd/config_file.c
+++ b/hostapd/config_file.c
@@ -3549,6 +3549,10 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 		conf->he_oper_centr_freq_seg0_idx = atoi(pos);
 	} else if (os_strcmp(buf, "he_oper_centr_freq_seg1_idx") == 0) {
 		conf->he_oper_centr_freq_seg1_idx = atoi(pos);
+	} else if (os_strcmp(buf,
+			     "unsol_bcast_probe_resp_interval") == 0) {
+		bss->unsol_bcast_probe_resp_interval =
+			(atoi(pos) > 20) ? 20 : atoi(pos);
 #endif /* CONFIG_IEEE80211AX */
 	} else if (os_strcmp(buf, "max_listen_interval") == 0) {
 		bss->max_listen_interval = atoi(pos);
diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
index 2b0f762e544e..480c7dc7a469 100644
--- a/hostapd/hostapd.conf
+++ b/hostapd/hostapd.conf
@@ -867,6 +867,12 @@ wmm_ac_vo_acm=0
 #he_spr_srg_obss_pd_min_offset
 #he_spr_srg_obss_pd_max_offset
 
+# Unsolicited broadcast probe response transmission settings, 6GHz only.
+# If interval is set to non-zero, the AP schedules unsolicited
+# broadcast probe response frames for in-band discovery. Refer to
+# IEEE P802.11ax/D6.0 26.17.2.3.2, AP behavior for fast passive scanning.
+#unsol_bcast_probe_resp_interval=0(default) to 20 TUs.
+
 ##### IEEE 802.1X-2004 related configuration ##################################
 
 # Require IEEE 802.1X authorization
diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h
index b705c378fe28..74584159a6a6 100644
--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -860,6 +860,8 @@ struct hostapd_bss_config {
 	 */
 	u8 mka_psk_set;
 #endif /* CONFIG_MACSEC */
+
+	u32 unsol_bcast_probe_resp_interval;
 };
 
 /**
diff --git a/src/ap/beacon.c b/src/ap/beacon.c
index b3b33b7faf1d..071b753367e9 100644
--- a/src/ap/beacon.c
+++ b/src/ap/beacon.c
@@ -1123,6 +1123,21 @@ void sta_track_del(struct hostapd_sta_info *info)
 	os_free(info);
 }
 
+#ifdef CONFIG_IEEE80211AX
+/* Unsolicited broadcast probe response transmission, 6GHz only */
+static u8 *hostapd_unsol_bcast_probe_resp(struct hostapd_data *hapd,
+					  struct wpa_driver_ap_params *params)
+{
+	if (!is_6ghz_op_class(hapd->iconf->op_class))
+		return NULL;
+
+	params->unsol_bcast_probe_resp_interval =
+				hapd->conf->unsol_bcast_probe_resp_interval;
+
+	return hostapd_gen_probe_resp(hapd, NULL, 0,
+				      &params->unsol_bcast_probe_resp_tmpl_len);
+}
+#endif /* CONFIG_IEEE80211AX */
 
 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
 			       struct wpa_driver_ap_params *params)
@@ -1461,6 +1476,10 @@ void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
 	params->head = NULL;
 	os_free(params->proberesp);
 	params->proberesp = NULL;
+#ifdef CONFIG_IEEE80211AX
+	os_free(params->unsol_bcast_probe_resp_tmpl);
+	params->unsol_bcast_probe_resp_tmpl = NULL;
+#endif /* CONFIG_IEEE80211AX */
 }
 
 
@@ -1505,6 +1524,8 @@ int ieee802_11_set_beacon(struct hostapd_data *hapd)
 	params.he_bss_color = hapd->iface->conf->he_op.he_bss_color;
 	params.twt_responder = hostapd_get_he_twt_responder(hapd,
 							    IEEE80211_MODE_AP);
+	params.unsol_bcast_probe_resp_tmpl =
+				hostapd_unsol_bcast_probe_resp(hapd, &params);
 #endif /* CONFIG_IEEE80211AX */
 	hapd->reenable_beacon = 0;
 
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index 0ecda49dd1df..d36984488127 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -1508,6 +1508,21 @@ struct wpa_driver_ap_params {
 	 * twt_responder - Whether Target Wait Time responder is enabled
 	 */
 	int twt_responder;
+
+	/**
+	 * Unsolicited broadcast probe response interval
+	 */
+	u32 unsol_bcast_probe_resp_interval;
+
+	/**
+	 * Unsolicited broadcast probe response template data
+	 */
+	u8 *unsol_bcast_probe_resp_tmpl;
+
+	/**
+	 * Unsolicited broadcast probe response template length
+	 */
+	size_t unsol_bcast_probe_resp_tmpl_len;
 };
 
 struct wpa_driver_mesh_bss_params {
-- 
2.25.0


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