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 software may be distributed under the terms of the BSD license.
7 * See README for more details.
10 #include "utils/includes.h"
12 #include "utils/common.h"
13 #include "utils/eloop.h"
14 #include "common/ieee802_11_defs.h"
16 #include "ap_config.h"
19 #include "ieee802_11.h"
20 #include "hw_features.h"
21 #include "ap_drv_ops.h"
24 u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
26 struct ieee80211_ht_capabilities *cap;
29 if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode ||
30 hapd->conf->disable_11n)
33 *pos++ = WLAN_EID_HT_CAP;
34 *pos++ = sizeof(*cap);
36 cap = (struct ieee80211_ht_capabilities *) pos;
37 os_memset(cap, 0, sizeof(*cap));
38 cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
39 cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
40 os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set,
43 /* TODO: ht_extended_capabilities (now fully disabled) */
44 /* TODO: tx_bf_capability_info (now fully disabled) */
45 /* TODO: asel_capabilities (now fully disabled) */
49 if (hapd->iconf->obss_interval) {
50 struct ieee80211_obss_scan_parameters *scan_params;
52 *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS;
53 *pos++ = sizeof(*scan_params);
55 scan_params = (struct ieee80211_obss_scan_parameters *) pos;
56 os_memset(scan_params, 0, sizeof(*scan_params));
57 scan_params->width_trigger_scan_interval =
58 host_to_le16(hapd->iconf->obss_interval);
60 /* Fill in default values for remaining parameters
61 * (IEEE Std 802.11-2012, 8.4.2.61 and MIB defval) */
62 scan_params->scan_passive_dwell =
64 scan_params->scan_active_dwell =
66 scan_params->scan_passive_total_per_channel =
68 scan_params->scan_active_total_per_channel =
70 scan_params->channel_transition_delay_factor =
72 scan_params->scan_activity_threshold =
75 pos += sizeof(*scan_params);
82 u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
84 struct ieee80211_ht_operation *oper;
87 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
90 *pos++ = WLAN_EID_HT_OPERATION;
91 *pos++ = sizeof(*oper);
93 oper = (struct ieee80211_ht_operation *) pos;
94 os_memset(oper, 0, sizeof(*oper));
96 oper->primary_chan = hapd->iconf->channel;
97 oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
98 if (hapd->iconf->secondary_channel == 1)
99 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
100 HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
101 if (hapd->iconf->secondary_channel == -1)
102 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
103 HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
105 pos += sizeof(*oper);
113 Set to 0 (HT pure) under the followign conditions
114 - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or
115 - all STAs in the BSS are 20 MHz HT in 20 MHz BSS
116 Set to 1 (HT non-member protection) if there may be non-HT STAs
117 in both the primary and the secondary channel
118 Set to 2 if only HT STAs are associated in BSS,
119 however and at least one 20 MHz HT STA is associated
120 Set to 3 (HT mixed mode) when one or more non-HT STAs are associated
122 int hostapd_ht_operation_update(struct hostapd_iface *iface)
124 u16 cur_op_mode, new_op_mode;
125 int op_mode_changes = 0;
127 if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
130 wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
131 __func__, iface->ht_op_mode);
133 if (!(iface->ht_op_mode & HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT)
134 && iface->num_sta_ht_no_gf) {
135 iface->ht_op_mode |= HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT;
137 } else if ((iface->ht_op_mode &
138 HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT) &&
139 iface->num_sta_ht_no_gf == 0) {
140 iface->ht_op_mode &= ~HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT;
144 if (!(iface->ht_op_mode & HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
145 (iface->num_sta_no_ht || iface->olbc_ht)) {
146 iface->ht_op_mode |= HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
148 } else if ((iface->ht_op_mode &
149 HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
150 (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
151 iface->ht_op_mode &= ~HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
155 if (iface->num_sta_no_ht)
156 new_op_mode = HT_PROT_NON_HT_MIXED;
157 else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz)
158 new_op_mode = HT_PROT_20MHZ_PROTECTION;
159 else if (iface->olbc_ht)
160 new_op_mode = HT_PROT_NONMEMBER_PROTECTION;
162 new_op_mode = HT_PROT_NO_PROTECTION;
164 cur_op_mode = iface->ht_op_mode & HT_OPER_OP_MODE_HT_PROT_MASK;
165 if (cur_op_mode != new_op_mode) {
166 iface->ht_op_mode &= ~HT_OPER_OP_MODE_HT_PROT_MASK;
167 iface->ht_op_mode |= new_op_mode;
171 wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
172 __func__, iface->ht_op_mode, op_mode_changes);
174 return op_mode_changes;
178 static int is_40_allowed(struct hostapd_iface *iface, int channel)
180 int pri_freq, sec_freq;
181 int affected_start, affected_end;
182 int pri = 2407 + 5 * channel;
184 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
187 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
189 if (iface->conf->secondary_channel > 0)
190 sec_freq = pri_freq + 20;
192 sec_freq = pri_freq - 20;
194 affected_start = (pri_freq + sec_freq) / 2 - 25;
195 affected_end = (pri_freq + sec_freq) / 2 + 25;
196 if ((pri < affected_start || pri > affected_end))
197 return 1; /* not within affected channel range */
199 wpa_printf(MSG_ERROR, "40 MHz affected channel range: [%d,%d] MHz",
200 affected_start, affected_end);
201 wpa_printf(MSG_ERROR, "Neighboring BSS: freq=%d", pri);
206 void hostapd_2040_coex_action(struct hostapd_data *hapd,
207 const struct ieee80211_mgmt *mgmt, size_t len)
209 struct hostapd_iface *iface = hapd->iface;
210 struct ieee80211_2040_bss_coex_ie *bc_ie;
211 struct ieee80211_2040_intol_chan_report *ic_report;
212 int is_ht_allowed = 1;
214 const u8 *start = (const u8 *) mgmt;
215 const u8 *data = start + IEEE80211_HDRLEN + 2;
217 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
218 HOSTAPD_LEVEL_DEBUG, "hostapd_public_action - action=%d",
219 mgmt->u.action.u.public_action.action);
221 if (!(iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET))
224 if (len < IEEE80211_HDRLEN + 2 + sizeof(*bc_ie))
227 bc_ie = (struct ieee80211_2040_bss_coex_ie *) data;
228 if (bc_ie->element_id != WLAN_EID_20_40_BSS_COEXISTENCE ||
230 wpa_printf(MSG_DEBUG, "Unexpected IE (%u,%u) in coex report",
231 bc_ie->element_id, bc_ie->length);
234 if (len < IEEE80211_HDRLEN + 2 + 2 + bc_ie->length)
236 data += 2 + bc_ie->length;
238 wpa_printf(MSG_DEBUG, "20/40 BSS Coexistence Information field: 0x%x",
240 if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_20MHZ_WIDTH_REQ) {
241 hostapd_logger(hapd, mgmt->sa,
242 HOSTAPD_MODULE_IEEE80211,
244 "20 MHz BSS width request bit is set in BSS coexistence information field");
248 if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_40MHZ_INTOL) {
249 hostapd_logger(hapd, mgmt->sa,
250 HOSTAPD_MODULE_IEEE80211,
252 "40 MHz intolerant bit is set in BSS coexistence information field");
256 if (start + len - data >= 3 &&
257 data[0] == WLAN_EID_20_40_BSS_INTOLERANT && data[1] >= 1) {
260 if (ielen > start + len - data - 2)
262 ic_report = (struct ieee80211_2040_intol_chan_report *) data;
263 wpa_printf(MSG_DEBUG,
264 "20/40 BSS Intolerant Channel Report: Operating Class %u",
265 ic_report->op_class);
267 /* Go through the channel report to find any BSS there in the
268 * affected channel range */
269 for (i = 0; i < ielen - 1; i++) {
270 u8 chan = ic_report->variable[i];
272 if (is_40_allowed(iface, chan))
274 hostapd_logger(hapd, mgmt->sa,
275 HOSTAPD_MODULE_IEEE80211,
277 "20_40_INTOLERANT channel %d reported",
282 wpa_printf(MSG_DEBUG, "is_ht_allowed=%d num_sta_ht40_intolerant=%d",
283 is_ht_allowed, iface->num_sta_ht40_intolerant);
285 if (!is_ht_allowed &&
286 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
287 if (iface->conf->secondary_channel) {
288 hostapd_logger(hapd, mgmt->sa,
289 HOSTAPD_MODULE_IEEE80211,
291 "Switching to 20 MHz operation");
292 iface->conf->secondary_channel = 0;
293 ieee802_11_set_beacons(iface);
295 if (!iface->num_sta_ht40_intolerant &&
296 iface->conf->obss_interval) {
297 unsigned int delay_time;
298 delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
299 iface->conf->obss_interval;
300 eloop_cancel_timeout(ap_ht2040_timeout, hapd->iface,
302 eloop_register_timeout(delay_time, 0, ap_ht2040_timeout,
304 wpa_printf(MSG_DEBUG,
305 "Reschedule HT 20/40 timeout to occur in %u seconds",
312 u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta,
313 const u8 *ht_capab, size_t ht_capab_len)
315 /* Disable HT caps for STAs associated to no-HT BSSes. */
317 ht_capab_len < sizeof(struct ieee80211_ht_capabilities) ||
318 hapd->conf->disable_11n) {
319 sta->flags &= ~WLAN_STA_HT;
320 os_free(sta->ht_capabilities);
321 sta->ht_capabilities = NULL;
322 return WLAN_STATUS_SUCCESS;
325 if (sta->ht_capabilities == NULL) {
326 sta->ht_capabilities =
327 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
328 if (sta->ht_capabilities == NULL)
329 return WLAN_STATUS_UNSPECIFIED_FAILURE;
332 sta->flags |= WLAN_STA_HT;
333 os_memcpy(sta->ht_capabilities, ht_capab,
334 sizeof(struct ieee80211_ht_capabilities));
336 return WLAN_STATUS_SUCCESS;
340 void ht40_intolerant_add(struct hostapd_iface *iface, struct sta_info *sta)
342 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
345 wpa_printf(MSG_INFO, "HT: Forty MHz Intolerant is set by STA " MACSTR
346 " in Association Request", MAC2STR(sta->addr));
348 if (sta->ht40_intolerant_set)
351 sta->ht40_intolerant_set = 1;
352 iface->num_sta_ht40_intolerant++;
353 eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
355 if (iface->conf->secondary_channel &&
356 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
357 iface->conf->secondary_channel = 0;
358 ieee802_11_set_beacons(iface);
363 void ht40_intolerant_remove(struct hostapd_iface *iface, struct sta_info *sta)
365 if (!sta->ht40_intolerant_set)
368 sta->ht40_intolerant_set = 0;
369 iface->num_sta_ht40_intolerant--;
371 if (iface->num_sta_ht40_intolerant == 0 &&
372 (iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
373 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
374 unsigned int delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
375 iface->conf->obss_interval;
376 wpa_printf(MSG_DEBUG,
377 "HT: Start 20->40 MHz transition timer (%d seconds)",
379 eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
380 eloop_register_timeout(delay_time, 0, ap_ht2040_timeout,
386 static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
390 ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
391 wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
392 "0x%04x", MAC2STR(sta->addr), ht_capab);
393 if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
394 if (!sta->no_ht_gf_set) {
395 sta->no_ht_gf_set = 1;
396 hapd->iface->num_sta_ht_no_gf++;
398 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
399 "of non-gf stations %d",
400 __func__, MAC2STR(sta->addr),
401 hapd->iface->num_sta_ht_no_gf);
403 if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
404 if (!sta->ht_20mhz_set) {
405 sta->ht_20mhz_set = 1;
406 hapd->iface->num_sta_ht_20mhz++;
408 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
410 __func__, MAC2STR(sta->addr),
411 hapd->iface->num_sta_ht_20mhz);
414 if (ht_capab & HT_CAP_INFO_40MHZ_INTOLERANT)
415 ht40_intolerant_add(hapd->iface, sta);
419 static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
421 if (!sta->no_ht_set) {
423 hapd->iface->num_sta_no_ht++;
425 if (hapd->iconf->ieee80211n) {
426 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
427 "non-HT stations %d",
428 __func__, MAC2STR(sta->addr),
429 hapd->iface->num_sta_no_ht);
434 void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
436 if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
437 update_sta_ht(hapd, sta);
439 update_sta_no_ht(hapd, sta);
441 if (hostapd_ht_operation_update(hapd->iface) > 0)
442 ieee802_11_set_beacons(hapd->iface);
446 void hostapd_get_ht_capab(struct hostapd_data *hapd,
447 struct ieee80211_ht_capabilities *ht_cap,
448 struct ieee80211_ht_capabilities *neg_ht_cap)
454 os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
455 cap = le_to_host16(neg_ht_cap->ht_capabilities_info);
458 * Mask out HT features we don't support, but don't overwrite
459 * non-symmetric features like STBC and SMPS. Just because
460 * we're not in dynamic SMPS mode the STA might still be.
462 cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK |
463 HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK);
466 * STBC needs to be handled specially
467 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
468 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
470 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
471 cap &= ~HT_CAP_INFO_TX_STBC;
472 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
473 cap &= ~HT_CAP_INFO_RX_STBC_MASK;
475 neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
479 void ap_ht2040_timeout(void *eloop_data, void *user_data)
481 struct hostapd_iface *iface = eloop_data;
483 wpa_printf(MSG_INFO, "Switching to 40 MHz operation");
485 iface->conf->secondary_channel = iface->secondary_ch;
486 ieee802_11_set_beacons(iface);