[PATCH 3/3] hostapd: update TPE IE according to AFC

[Lorenzo Bianconi]

Update Transmit Power Envelope (TPE) IE according to the reply from AFC
coordinator on UNII-5 or UNII-7 6GHz bands.

Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 src/ap/hostapd.c    | 39 +++++++++++++++++++++++++++++++++++++
 src/ap/hostapd.h    |  2 ++
 src/ap/ieee802_11.c | 47 ++++++++++++++++++++++++++++-----------------
 3 files changed, 70 insertions(+), 18 deletions(-)

diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
index d0ea86811..1b21bf43c 100644
--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -4439,6 +4439,45 @@ struct hostapd_data * hostapd_mld_get_link_bss(struct hostapd_data *hapd,
 #endif /* CONFIG_IEEE80211BE */
 
 
+int hostap_afc_get_chan_max_eirp_power(struct hostapd_iface *iface, bool psd,
+				       int *power)
+{
+#ifdef CONFIG_AFC
+	int i;
+
+	if (!he_reg_is_sp(iface->conf->he_6ghz_reg_pwr_type))
+		return -EINVAL;
+
+	if (!iface->afc.completed)
+		return -EINVAL;
+
+	if (psd) {
+		for (i = 0; i < iface->afc.num_freq_range; i++) {
+			struct afc_freq_range_elem *f;
+
+			f = &iface->afc.freq_range[i];
+			if (iface->freq >= f->low_freq &&
+			    iface->freq <= f->high_freq) {
+				*power = 2 * f->max_psd;
+				return 0;
+			}
+		}
+	} else {
+		for (i = 0; i < iface->afc.num_chan_info; i++) {
+			struct afc_chan_info_elem *c;
+
+			c = &iface->afc.chan_info_list[i];
+			if (c->chan == iface->conf->channel) {
+				*power = 2 * c->power;
+				return 0;
+			}
+		}
+	}
+#endif /* CONFIG_AFC */
+	return -EINVAL;
+}
+
+
 void hostap_afc_disable_channels(struct hostapd_iface *iface)
 {
 #ifdef CONFIG_AFC
diff --git a/src/ap/hostapd.h b/src/ap/hostapd.h
index bdb3075be..c7de7f75f 100644
--- a/src/ap/hostapd.h
+++ b/src/ap/hostapd.h
@@ -702,6 +702,8 @@ struct hostapd_iface {
 };
 
 /* hostapd.c */
+int hostap_afc_get_chan_max_eirp_power(struct hostapd_iface *iface, bool psd,
+				       int *power);
 void hostap_afc_disable_channels(struct hostapd_iface *iface);
 int hostapd_afc_handle_request(struct hostapd_iface *iface);
 
diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c
index 8b8c1f095..47982d0ec 100644
--- a/src/ap/ieee802_11.c
+++ b/src/ap/ieee802_11.c
@@ -7064,42 +7064,53 @@ u8 * hostapd_eid_txpower_envelope(struct hostapd_data *hapd, u8 *eid)
 	 */
 	if (is_6ghz_op_class(iconf->op_class)) {
 		enum max_tx_pwr_interpretation tx_pwr_intrpn;
+		int err, max_eirp_psd, max_eirp_power;
 
 		/* Same Maximum Transmit Power for all 20 MHz bands */
 		tx_pwr_count = 0;
 		tx_pwr_intrpn = REGULATORY_CLIENT_EIRP_PSD;
 
 		/* Default Transmit Power Envelope for Global Operating Class */
-		if (hapd->iconf->reg_def_cli_eirp_psd != -1)
-			tx_pwr = hapd->iconf->reg_def_cli_eirp_psd;
-		else
-			tx_pwr = REG_PSD_MAX_TXPOWER_FOR_DEFAULT_CLIENT * 2;
+		err = hostap_afc_get_chan_max_eirp_power(iface, true,
+							 &max_eirp_psd);
+		if (err < 0) {
+			if (hapd->iconf->reg_def_cli_eirp_psd != -1)
+				max_eirp_psd = hapd->iconf->reg_def_cli_eirp_psd;
+			else
+				max_eirp_psd = REG_PSD_MAX_TXPOWER_FOR_DEFAULT_CLIENT * 2;
+		}
 
 		eid = hostapd_add_tpe_info(eid, tx_pwr_count, tx_pwr_intrpn,
-					   REG_DEFAULT_CLIENT, tx_pwr);
+					   REG_DEFAULT_CLIENT, max_eirp_psd);
 
 		/* Indoor Access Point must include an additional TPE for
 		 * subordinate devices */
 		if (he_reg_is_indoor(iconf->he_6ghz_reg_pwr_type)) {
-			/* TODO: Extract PSD limits from channel data */
-			if (hapd->iconf->reg_sub_cli_eirp_psd != -1)
-				tx_pwr = hapd->iconf->reg_sub_cli_eirp_psd;
-			else
-				tx_pwr = REG_PSD_MAX_TXPOWER_FOR_SUBORDINATE_CLIENT * 2;
+			if (err < 0) {
+				/* non-AFC connection */
+				if (hapd->iconf->reg_sub_cli_eirp_psd != -1)
+					max_eirp_psd = hapd->iconf->reg_sub_cli_eirp_psd;
+				else
+					max_eirp_psd = REG_PSD_MAX_TXPOWER_FOR_SUBORDINATE_CLIENT * 2;
+			}
 			eid = hostapd_add_tpe_info(eid, tx_pwr_count,
 						   tx_pwr_intrpn,
 						   REG_SUBORDINATE_CLIENT,
-						   tx_pwr);
+						   max_eirp_psd);
 		}
 
-		if (iconf->reg_def_cli_eirp != -1 &&
-		    he_reg_is_sp(iconf->he_6ghz_reg_pwr_type))
-			eid = hostapd_add_tpe_info(
-				eid, tx_pwr_count, REGULATORY_CLIENT_EIRP,
-				REG_DEFAULT_CLIENT,
-				hapd->iconf->reg_def_cli_eirp);
+		if (hostap_afc_get_chan_max_eirp_power(iface, false,
+						       &max_eirp_power)) {
+			max_eirp_power = iconf->reg_def_cli_eirp;
+			if (max_eirp_power == -1 ||
+			    !he_reg_is_sp(iconf->he_6ghz_reg_pwr_type))
+				return eid;
+		}
 
-		return eid;
+		return hostapd_add_tpe_info(eid, tx_pwr_count,
+					    REGULATORY_CLIENT_EIRP,
+					    REG_DEFAULT_CLIENT,
+					    max_eirp_power);
 	}
 #endif /* CONFIG_IEEE80211AX */
 
-- 
2.43.2