2 * hostapd / IEEE 802.11n HT
3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
4 * Copyright (c) 2007-2008, Intel Corporation
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Alternatively, this software may be distributed under the terms of BSD
13 * See README and COPYING for more details.
16 #include "utils/includes.h"
18 #include "utils/common.h"
19 #include "common/ieee802_11_defs.h"
20 #include "drivers/driver.h"
22 #include "ap_config.h"
25 #include "ieee802_11.h"
28 u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
30 struct ieee80211_ht_capabilities *cap;
33 if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode)
36 *pos++ = WLAN_EID_HT_CAP;
37 *pos++ = sizeof(*cap);
39 cap = (struct ieee80211_ht_capabilities *) pos;
40 os_memset(cap, 0, sizeof(*cap));
41 cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
42 cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
43 os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set,
46 /* TODO: ht_extended_capabilities (now fully disabled) */
47 /* TODO: tx_bf_capability_info (now fully disabled) */
48 /* TODO: asel_capabilities (now fully disabled) */
56 u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
58 struct ieee80211_ht_operation *oper;
61 if (!hapd->iconf->ieee80211n)
64 *pos++ = WLAN_EID_HT_OPERATION;
65 *pos++ = sizeof(*oper);
67 oper = (struct ieee80211_ht_operation *) pos;
68 os_memset(oper, 0, sizeof(*oper));
70 oper->control_chan = hapd->iconf->channel;
71 oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
72 if (hapd->iconf->secondary_channel == 1)
73 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
74 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
75 if (hapd->iconf->secondary_channel == -1)
76 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
77 HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH;
87 Set to 0 (HT pure) under the followign conditions
88 - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or
89 - all STAs in the BSS are 20 MHz HT in 20 MHz BSS
90 Set to 1 (HT non-member protection) if there may be non-HT STAs
91 in both the primary and the secondary channel
92 Set to 2 if only HT STAs are associated in BSS,
93 however and at least one 20 MHz HT STA is associated
94 Set to 3 (HT mixed mode) when one or more non-HT STAs are associated
95 (currently non-GF HT station is considered as non-HT STA also)
97 int hostapd_ht_operation_update(struct hostapd_iface *iface)
99 u16 cur_op_mode, new_op_mode;
100 int op_mode_changes = 0;
102 if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
105 wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
106 __func__, iface->ht_op_mode);
108 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT)
109 && iface->num_sta_ht_no_gf) {
111 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
113 } else if ((iface->ht_op_mode &
114 HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT) &&
115 iface->num_sta_ht_no_gf == 0) {
117 ~HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT;
121 if (!(iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
122 (iface->num_sta_no_ht || iface->olbc_ht)) {
123 iface->ht_op_mode |= HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
125 } else if ((iface->ht_op_mode &
126 HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT) &&
127 (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
129 ~HT_INFO_OPERATION_MODE_NON_HT_STA_PRESENT;
133 /* Note: currently we switch to the MIXED op mode if HT non-greenfield
134 * station is associated. Probably it's a theoretical case, since
135 * it looks like all known HT STAs support greenfield.
138 if (iface->num_sta_no_ht ||
139 (iface->ht_op_mode & HT_INFO_OPERATION_MODE_NON_GF_DEVS_PRESENT))
140 new_op_mode = OP_MODE_MIXED;
141 else if ((iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)
142 && iface->num_sta_ht_20mhz)
143 new_op_mode = OP_MODE_20MHZ_HT_STA_ASSOCED;
144 else if (iface->olbc_ht)
145 new_op_mode = OP_MODE_MAY_BE_LEGACY_STAS;
147 new_op_mode = OP_MODE_PURE;
149 cur_op_mode = iface->ht_op_mode & HT_INFO_OPERATION_MODE_OP_MODE_MASK;
150 if (cur_op_mode != new_op_mode) {
151 iface->ht_op_mode &= ~HT_INFO_OPERATION_MODE_OP_MODE_MASK;
152 iface->ht_op_mode |= new_op_mode;
156 wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
157 __func__, iface->ht_op_mode, op_mode_changes);
159 return op_mode_changes;
163 u16 copy_sta_ht_capab(struct sta_info *sta, const u8 *ht_capab,
167 ht_capab_len < sizeof(struct ieee80211_ht_capabilities)) {
168 sta->flags &= ~WLAN_STA_HT;
169 os_free(sta->ht_capabilities);
170 sta->ht_capabilities = NULL;
171 return WLAN_STATUS_SUCCESS;
174 if (sta->ht_capabilities == NULL) {
175 sta->ht_capabilities =
176 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
177 if (sta->ht_capabilities == NULL)
178 return WLAN_STATUS_UNSPECIFIED_FAILURE;
181 sta->flags |= WLAN_STA_HT;
182 os_memcpy(sta->ht_capabilities, ht_capab,
183 sizeof(struct ieee80211_ht_capabilities));
185 return WLAN_STATUS_SUCCESS;
189 static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
193 ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
194 wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
195 "0x%04x", MAC2STR(sta->addr), ht_capab);
196 if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
197 if (!sta->no_ht_gf_set) {
198 sta->no_ht_gf_set = 1;
199 hapd->iface->num_sta_ht_no_gf++;
201 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
202 "of non-gf stations %d",
203 __func__, MAC2STR(sta->addr),
204 hapd->iface->num_sta_ht_no_gf);
206 if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
207 if (!sta->ht_20mhz_set) {
208 sta->ht_20mhz_set = 1;
209 hapd->iface->num_sta_ht_20mhz++;
211 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
213 __func__, MAC2STR(sta->addr),
214 hapd->iface->num_sta_ht_20mhz);
219 static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
221 if (!sta->no_ht_set) {
223 hapd->iface->num_sta_no_ht++;
225 if (hapd->iconf->ieee80211n) {
226 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
227 "non-HT stations %d",
228 __func__, MAC2STR(sta->addr),
229 hapd->iface->num_sta_no_ht);
234 void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
236 if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
237 update_sta_ht(hapd, sta);
239 update_sta_no_ht(hapd, sta);
241 if (hostapd_ht_operation_update(hapd->iface) > 0)
242 ieee802_11_set_beacons(hapd->iface);
246 void hostapd_get_ht_capab(struct hostapd_data *hapd,
247 struct ieee80211_ht_capabilities *ht_cap,
248 struct ieee80211_ht_capabilities *neg_ht_cap)
254 os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
255 cap = le_to_host16(neg_ht_cap->ht_capabilities_info);
256 cap &= hapd->iconf->ht_capab;
257 cap |= (hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_DISABLED);
260 * STBC needs to be handled specially
261 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
262 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
264 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
265 cap &= ~HT_CAP_INFO_TX_STBC;
266 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
267 cap &= ~HT_CAP_INFO_RX_STBC_MASK;
269 neg_ht_cap->ht_capabilities_info = host_to_le16(cap);