hostapd: Add IEEE 802.11ac VHT IEs into Beacon/Probe Response

IEEE 802.11ac VHT changes to include VHT IEs in Beacon and Probe
Response frames.

Signed-hostap: Mahesh Palivela <maheshp@posedge.com>

hostapd/Makefile

@@ -761,6 +761,10 @@ ifdef CONFIG_IEEE80211N
 OBJS += ../src/ap/ieee802_11_ht.o
 endif
 
+ifdef CONFIG_IEEE80211AC
+OBJS += ../src/ap/ieee802_11_vht.o
+endif
+
 ifdef CONFIG_P2P_MANAGER
 CFLAGS += -DCONFIG_P2P_MANAGER
 OBJS += ../src/ap/p2p_hostapd.o

src/ap/beacon.c

@@ -262,6 +262,11 @@ static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
 	pos = hostapd_eid_adv_proto(hapd, pos);
 	pos = hostapd_eid_roaming_consortium(hapd, pos);
 
+#ifdef CONFIG_IEEE80211AC
+	pos = hostapd_eid_vht_capabilities(hapd, pos);
+	pos = hostapd_eid_vht_operation(hapd, pos);
+#endif /* CONFIG_IEEE80211AC */
+
 	/* Wi-Fi Alliance WMM */
 	pos = hostapd_eid_wmm(hapd, pos);
 
@@ -595,6 +600,11 @@ void ieee802_11_set_beacon(struct hostapd_data *hapd)
 	tailpos = hostapd_eid_adv_proto(hapd, tailpos);
 	tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
 
+#ifdef CONFIG_IEEE80211AC
+	tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
+	tailpos = hostapd_eid_vht_operation(hapd, tailpos);
+#endif /* CONFIG_IEEE80211AC */
+
 	/* Wi-Fi Alliance WMM */
 	tailpos = hostapd_eid_wmm(hapd, tailpos);
 

src/ap/ieee802_11.h

@@ -45,6 +45,8 @@ u8 * hostapd_eid_supp_rates(struct hostapd_data *hapd, u8 *eid);
 u8 * hostapd_eid_ext_supp_rates(struct hostapd_data *hapd, u8 *eid);
 u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid);
 u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid);
+u8 * hostapd_eid_vht_capabilities(struct hostapd_data *hapd, u8 *eid);
+u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid);
 int hostapd_ht_operation_update(struct hostapd_iface *iface);
 void ieee802_11_send_sa_query_req(struct hostapd_data *hapd,
 				  const u8 *addr, const u8 *trans_id);

src/ap/ieee802_11_vht.c

@@ -0,0 +1,72 @@
+/*
+ * hostapd / IEEE 802.11ac VHT
+ * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of BSD license
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "common/ieee802_11_defs.h"
+#include "drivers/driver.h"
+#include "hostapd.h"
+#include "ap_config.h"
+#include "sta_info.h"
+#include "beacon.h"
+#include "ieee802_11.h"
+
+
+u8 * hostapd_eid_vht_capabilities(struct hostapd_data *hapd, u8 *eid)
+{
+	struct ieee80211_vht_capabilities *cap;
+	u8 *pos = eid;
+
+	if (!hapd->iconf->ieee80211ac || !hapd->iface->current_mode ||
+	    hapd->conf->disable_11ac)
+		return eid;
+
+	*pos++ = WLAN_EID_VHT_CAP;
+	*pos++ = sizeof(*cap);
+
+	cap = (struct ieee80211_vht_capabilities *) pos;
+	os_memset(cap, 0, sizeof(*cap));
+	cap->vht_capabilities_info = host_to_le32(
+		hapd->iface->current_mode->vht_capab);
+
+	/* Supported MCS set comes from hw */
+	os_memcpy(cap->vht_supported_mcs_set,
+	          hapd->iface->current_mode->vht_mcs_set, 8);
+
+	pos += sizeof(*cap);
+
+	return pos;
+}
+
+
+u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid)
+{
+	struct ieee80211_vht_operation *oper;
+	u8 *pos = eid;
+
+	if (!hapd->iconf->ieee80211ac || hapd->conf->disable_11ac)
+		return eid;
+
+	*pos++ = WLAN_EID_VHT_OPERATION;
+	*pos++ = sizeof(*oper);
+
+	oper = (struct ieee80211_vht_operation *) pos;
+	os_memset(oper, 0, sizeof(*oper));
+
+	oper->vht_op_info_chwidth = hapd->iconf->vht_oper_chwidth;
+
+	/* VHT Basic MCS set comes from hw */
+	/* Hard code 1 stream, MCS0-7 is a min Basic VHT MCS rates */
+	oper->vht_basic_mcs_set = 0xfffc;
+	pos += sizeof(*oper);
+
+	return pos;
+}