Line data Source code
1 : /*
2 : * hostapd / IEEE 802.11n HT
3 : * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
4 : * Copyright (c) 2007-2008, Intel Corporation
5 : *
6 : * This software may be distributed under the terms of the BSD license.
7 : * See README for more details.
8 : */
9 :
10 : #include "utils/includes.h"
11 :
12 : #include "utils/common.h"
13 : #include "utils/eloop.h"
14 : #include "common/ieee802_11_defs.h"
15 : #include "hostapd.h"
16 : #include "ap_config.h"
17 : #include "sta_info.h"
18 : #include "beacon.h"
19 : #include "ieee802_11.h"
20 : #include "hw_features.h"
21 : #include "ap_drv_ops.h"
22 :
23 :
24 7641 : u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
25 : {
26 : struct ieee80211_ht_capabilities *cap;
27 7641 : u8 *pos = eid;
28 :
29 15224 : if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode ||
30 7583 : hapd->conf->disable_11n)
31 203 : return eid;
32 :
33 7438 : *pos++ = WLAN_EID_HT_CAP;
34 7438 : *pos++ = sizeof(*cap);
35 :
36 7438 : cap = (struct ieee80211_ht_capabilities *) pos;
37 7438 : os_memset(cap, 0, sizeof(*cap));
38 7438 : cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
39 7438 : cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
40 7438 : os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set,
41 : 16);
42 :
43 : /* TODO: ht_extended_capabilities (now fully disabled) */
44 : /* TODO: tx_bf_capability_info (now fully disabled) */
45 : /* TODO: asel_capabilities (now fully disabled) */
46 :
47 7438 : pos += sizeof(*cap);
48 :
49 7438 : if (hapd->iconf->obss_interval) {
50 : struct ieee80211_obss_scan_parameters *scan_params;
51 :
52 23 : *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS;
53 23 : *pos++ = sizeof(*scan_params);
54 :
55 23 : scan_params = (struct ieee80211_obss_scan_parameters *) pos;
56 23 : os_memset(scan_params, 0, sizeof(*scan_params));
57 23 : scan_params->width_trigger_scan_interval =
58 23 : host_to_le16(hapd->iconf->obss_interval);
59 :
60 : /* Fill in default values for remaining parameters
61 : * (IEEE Std 802.11-2012, 8.4.2.61 and MIB defval) */
62 23 : scan_params->scan_passive_dwell =
63 : host_to_le16(20);
64 23 : scan_params->scan_active_dwell =
65 : host_to_le16(10);
66 23 : scan_params->scan_passive_total_per_channel =
67 : host_to_le16(200);
68 23 : scan_params->scan_active_total_per_channel =
69 : host_to_le16(20);
70 23 : scan_params->channel_transition_delay_factor =
71 : host_to_le16(5);
72 23 : scan_params->scan_activity_threshold =
73 : host_to_le16(25);
74 :
75 23 : pos += sizeof(*scan_params);
76 : }
77 :
78 7438 : return pos;
79 : }
80 :
81 :
82 7641 : u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
83 : {
84 : struct ieee80211_ht_operation *oper;
85 7641 : u8 *pos = eid;
86 :
87 7641 : if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
88 203 : return eid;
89 :
90 7438 : *pos++ = WLAN_EID_HT_OPERATION;
91 7438 : *pos++ = sizeof(*oper);
92 :
93 7438 : oper = (struct ieee80211_ht_operation *) pos;
94 7438 : os_memset(oper, 0, sizeof(*oper));
95 :
96 7438 : oper->primary_chan = hapd->iconf->channel;
97 7438 : oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
98 7438 : if (hapd->iconf->secondary_channel == 1)
99 102 : oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
100 : HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
101 7438 : if (hapd->iconf->secondary_channel == -1)
102 33 : oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
103 : HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
104 :
105 7438 : pos += sizeof(*oper);
106 :
107 7438 : return pos;
108 : }
109 :
110 :
111 : /*
112 : op_mode
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
121 : */
122 4749 : int hostapd_ht_operation_update(struct hostapd_iface *iface)
123 : {
124 : u16 cur_op_mode, new_op_mode;
125 4749 : int op_mode_changes = 0;
126 :
127 4749 : if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
128 19 : return 0;
129 :
130 4730 : wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
131 4730 : __func__, iface->ht_op_mode);
132 :
133 4730 : if (!(iface->ht_op_mode & HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT)
134 4730 : && iface->num_sta_ht_no_gf) {
135 0 : iface->ht_op_mode |= HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT;
136 0 : op_mode_changes++;
137 4730 : } else if ((iface->ht_op_mode &
138 0 : HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT) &&
139 0 : iface->num_sta_ht_no_gf == 0) {
140 0 : iface->ht_op_mode &= ~HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT;
141 0 : op_mode_changes++;
142 : }
143 :
144 9403 : if (!(iface->ht_op_mode & HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
145 9312 : (iface->num_sta_no_ht || iface->olbc_ht)) {
146 36 : iface->ht_op_mode |= HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
147 36 : op_mode_changes++;
148 4694 : } else if ((iface->ht_op_mode &
149 57 : HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
150 92 : (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
151 35 : iface->ht_op_mode &= ~HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
152 35 : op_mode_changes++;
153 : }
154 :
155 4730 : if (iface->num_sta_no_ht)
156 56 : new_op_mode = HT_PROT_NON_HT_MIXED;
157 4674 : else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz)
158 0 : new_op_mode = HT_PROT_20MHZ_PROTECTION;
159 4674 : else if (iface->olbc_ht)
160 2 : new_op_mode = HT_PROT_NONMEMBER_PROTECTION;
161 : else
162 4672 : new_op_mode = HT_PROT_NO_PROTECTION;
163 :
164 4730 : cur_op_mode = iface->ht_op_mode & HT_OPER_OP_MODE_HT_PROT_MASK;
165 4730 : if (cur_op_mode != new_op_mode) {
166 71 : iface->ht_op_mode &= ~HT_OPER_OP_MODE_HT_PROT_MASK;
167 71 : iface->ht_op_mode |= new_op_mode;
168 71 : op_mode_changes++;
169 : }
170 :
171 4730 : wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
172 4730 : __func__, iface->ht_op_mode, op_mode_changes);
173 :
174 4730 : return op_mode_changes;
175 : }
176 :
177 :
178 4 : static int is_40_allowed(struct hostapd_iface *iface, int channel)
179 : {
180 : int pri_freq, sec_freq;
181 : int affected_start, affected_end;
182 4 : int pri = 2407 + 5 * channel;
183 :
184 4 : if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
185 0 : return 1;
186 :
187 4 : pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
188 :
189 4 : if (iface->conf->secondary_channel > 0)
190 1 : sec_freq = pri_freq + 20;
191 : else
192 3 : sec_freq = pri_freq - 20;
193 :
194 4 : affected_start = (pri_freq + sec_freq) / 2 - 25;
195 4 : affected_end = (pri_freq + sec_freq) / 2 + 25;
196 4 : if ((pri < affected_start || pri > affected_end))
197 1 : return 1; /* not within affected channel range */
198 :
199 3 : wpa_printf(MSG_ERROR, "40 MHz affected channel range: [%d,%d] MHz",
200 : affected_start, affected_end);
201 3 : wpa_printf(MSG_ERROR, "Neighboring BSS: freq=%d", pri);
202 3 : return 0;
203 : }
204 :
205 :
206 14 : void hostapd_2040_coex_action(struct hostapd_data *hapd,
207 : const struct ieee80211_mgmt *mgmt, size_t len)
208 : {
209 14 : 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 14 : int is_ht_allowed = 1;
213 : int i;
214 14 : const u8 *start = (const u8 *) mgmt;
215 14 : const u8 *data = start + IEEE80211_HDRLEN + 2;
216 :
217 14 : hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
218 : HOSTAPD_LEVEL_DEBUG, "hostapd_public_action - action=%d",
219 14 : mgmt->u.action.u.public_action.action);
220 :
221 14 : if (!(iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET))
222 0 : return;
223 :
224 14 : if (len < IEEE80211_HDRLEN + 2 + sizeof(*bc_ie))
225 3 : return;
226 :
227 11 : bc_ie = (struct ieee80211_2040_bss_coex_ie *) data;
228 21 : if (bc_ie->element_id != WLAN_EID_20_40_BSS_COEXISTENCE ||
229 10 : bc_ie->length < 1) {
230 4 : wpa_printf(MSG_DEBUG, "Unexpected IE (%u,%u) in coex report",
231 4 : bc_ie->element_id, bc_ie->length);
232 2 : return;
233 : }
234 9 : if (len < IEEE80211_HDRLEN + 2 + 2 + bc_ie->length)
235 1 : return;
236 8 : data += 2 + bc_ie->length;
237 :
238 8 : wpa_printf(MSG_DEBUG, "20/40 BSS Coexistence Information field: 0x%x",
239 8 : bc_ie->coex_param);
240 8 : if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_20MHZ_WIDTH_REQ) {
241 4 : hostapd_logger(hapd, mgmt->sa,
242 : HOSTAPD_MODULE_IEEE80211,
243 : HOSTAPD_LEVEL_DEBUG,
244 : "20 MHz BSS width request bit is set in BSS coexistence information field");
245 4 : is_ht_allowed = 0;
246 : }
247 :
248 8 : if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_40MHZ_INTOL) {
249 1 : hostapd_logger(hapd, mgmt->sa,
250 : HOSTAPD_MODULE_IEEE80211,
251 : HOSTAPD_LEVEL_DEBUG,
252 : "40 MHz intolerant bit is set in BSS coexistence information field");
253 1 : is_ht_allowed = 0;
254 : }
255 :
256 14 : if (start + len - data >= 3 &&
257 12 : data[0] == WLAN_EID_20_40_BSS_INTOLERANT && data[1] >= 1) {
258 6 : u8 ielen = data[1];
259 :
260 6 : if (ielen > start + len - data - 2)
261 1 : return;
262 5 : ic_report = (struct ieee80211_2040_intol_chan_report *) data;
263 5 : wpa_printf(MSG_DEBUG,
264 : "20/40 BSS Intolerant Channel Report: Operating Class %u",
265 5 : ic_report->op_class);
266 :
267 : /* Go through the channel report to find any BSS there in the
268 : * affected channel range */
269 9 : for (i = 0; i < ielen - 1; i++) {
270 4 : u8 chan = ic_report->variable[i];
271 :
272 4 : if (is_40_allowed(iface, chan))
273 1 : continue;
274 3 : hostapd_logger(hapd, mgmt->sa,
275 : HOSTAPD_MODULE_IEEE80211,
276 : HOSTAPD_LEVEL_DEBUG,
277 : "20_40_INTOLERANT channel %d reported",
278 : chan);
279 3 : is_ht_allowed = 0;
280 : }
281 : }
282 7 : wpa_printf(MSG_DEBUG, "is_ht_allowed=%d num_sta_ht40_intolerant=%d",
283 : is_ht_allowed, iface->num_sta_ht40_intolerant);
284 :
285 10 : if (!is_ht_allowed &&
286 3 : (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
287 3 : if (iface->conf->secondary_channel) {
288 3 : hostapd_logger(hapd, mgmt->sa,
289 : HOSTAPD_MODULE_IEEE80211,
290 : HOSTAPD_LEVEL_INFO,
291 : "Switching to 20 MHz operation");
292 3 : iface->conf->secondary_channel = 0;
293 3 : ieee802_11_set_beacons(iface);
294 : }
295 6 : if (!iface->num_sta_ht40_intolerant &&
296 3 : iface->conf->obss_interval) {
297 : unsigned int delay_time;
298 2 : delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
299 2 : iface->conf->obss_interval;
300 2 : eloop_cancel_timeout(ap_ht2040_timeout, hapd->iface,
301 : NULL);
302 2 : eloop_register_timeout(delay_time, 0, ap_ht2040_timeout,
303 2 : hapd->iface, NULL);
304 2 : wpa_printf(MSG_DEBUG,
305 : "Reschedule HT 20/40 timeout to occur in %u seconds",
306 : delay_time);
307 : }
308 : }
309 : }
310 :
311 :
312 2532 : u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta,
313 : const u8 *ht_capab, size_t ht_capab_len)
314 : {
315 : /* Disable HT caps for STAs associated to no-HT BSSes. */
316 2532 : if (!ht_capab ||
317 2479 : ht_capab_len < sizeof(struct ieee80211_ht_capabilities) ||
318 2479 : hapd->conf->disable_11n) {
319 53 : sta->flags &= ~WLAN_STA_HT;
320 53 : os_free(sta->ht_capabilities);
321 53 : sta->ht_capabilities = NULL;
322 53 : return WLAN_STATUS_SUCCESS;
323 : }
324 :
325 2479 : if (sta->ht_capabilities == NULL) {
326 2161 : sta->ht_capabilities =
327 2161 : os_zalloc(sizeof(struct ieee80211_ht_capabilities));
328 2161 : if (sta->ht_capabilities == NULL)
329 0 : return WLAN_STATUS_UNSPECIFIED_FAILURE;
330 : }
331 :
332 2479 : sta->flags |= WLAN_STA_HT;
333 2479 : os_memcpy(sta->ht_capabilities, ht_capab,
334 : sizeof(struct ieee80211_ht_capabilities));
335 :
336 2479 : return WLAN_STATUS_SUCCESS;
337 : }
338 :
339 :
340 1 : void ht40_intolerant_add(struct hostapd_iface *iface, struct sta_info *sta)
341 : {
342 1 : if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
343 0 : return;
344 :
345 6 : wpa_printf(MSG_INFO, "HT: Forty MHz Intolerant is set by STA " MACSTR
346 6 : " in Association Request", MAC2STR(sta->addr));
347 :
348 1 : if (sta->ht40_intolerant_set)
349 0 : return;
350 :
351 1 : sta->ht40_intolerant_set = 1;
352 1 : iface->num_sta_ht40_intolerant++;
353 1 : eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
354 :
355 2 : if (iface->conf->secondary_channel &&
356 1 : (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
357 1 : iface->conf->secondary_channel = 0;
358 1 : ieee802_11_set_beacons(iface);
359 : }
360 : }
361 :
362 :
363 2227 : void ht40_intolerant_remove(struct hostapd_iface *iface, struct sta_info *sta)
364 : {
365 2227 : if (!sta->ht40_intolerant_set)
366 4453 : return;
367 :
368 1 : sta->ht40_intolerant_set = 0;
369 1 : iface->num_sta_ht40_intolerant--;
370 :
371 2 : if (iface->num_sta_ht40_intolerant == 0 &&
372 2 : (iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
373 1 : (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
374 1 : unsigned int delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
375 1 : iface->conf->obss_interval;
376 1 : wpa_printf(MSG_DEBUG,
377 : "HT: Start 20->40 MHz transition timer (%d seconds)",
378 : delay_time);
379 1 : eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
380 1 : eloop_register_timeout(delay_time, 0, ap_ht2040_timeout,
381 : iface, NULL);
382 : }
383 : }
384 :
385 :
386 2473 : static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
387 : {
388 : u16 ht_capab;
389 :
390 2473 : ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
391 17311 : wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
392 14838 : "0x%04x", MAC2STR(sta->addr), ht_capab);
393 2473 : if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
394 0 : if (!sta->no_ht_gf_set) {
395 0 : sta->no_ht_gf_set = 1;
396 0 : hapd->iface->num_sta_ht_no_gf++;
397 : }
398 0 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
399 : "of non-gf stations %d",
400 0 : __func__, MAC2STR(sta->addr),
401 0 : hapd->iface->num_sta_ht_no_gf);
402 : }
403 2473 : if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
404 2393 : if (!sta->ht_20mhz_set) {
405 2098 : sta->ht_20mhz_set = 1;
406 2098 : hapd->iface->num_sta_ht_20mhz++;
407 : }
408 16751 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
409 : "20MHz HT STAs %d",
410 14358 : __func__, MAC2STR(sta->addr),
411 2393 : hapd->iface->num_sta_ht_20mhz);
412 : }
413 :
414 2473 : if (ht_capab & HT_CAP_INFO_40MHZ_INTOLERANT)
415 1 : ht40_intolerant_add(hapd->iface, sta);
416 2473 : }
417 :
418 :
419 46 : static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
420 : {
421 46 : if (!sta->no_ht_set) {
422 45 : sta->no_ht_set = 1;
423 45 : hapd->iface->num_sta_no_ht++;
424 : }
425 46 : if (hapd->iconf->ieee80211n) {
426 287 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
427 : "non-HT stations %d",
428 246 : __func__, MAC2STR(sta->addr),
429 41 : hapd->iface->num_sta_no_ht);
430 : }
431 46 : }
432 :
433 :
434 2519 : void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
435 : {
436 2519 : if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
437 2473 : update_sta_ht(hapd, sta);
438 : else
439 46 : update_sta_no_ht(hapd, sta);
440 :
441 2519 : if (hostapd_ht_operation_update(hapd->iface) > 0)
442 34 : ieee802_11_set_beacons(hapd->iface);
443 2519 : }
444 :
445 :
446 2415 : void hostapd_get_ht_capab(struct hostapd_data *hapd,
447 : struct ieee80211_ht_capabilities *ht_cap,
448 : struct ieee80211_ht_capabilities *neg_ht_cap)
449 : {
450 : u16 cap;
451 :
452 2415 : if (ht_cap == NULL)
453 2415 : return;
454 2415 : os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
455 2415 : cap = le_to_host16(neg_ht_cap->ht_capabilities_info);
456 :
457 : /*
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.
461 : */
462 2415 : cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK |
463 : HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK);
464 :
465 : /*
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
469 : */
470 2415 : if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
471 2415 : cap &= ~HT_CAP_INFO_TX_STBC;
472 2415 : if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
473 2415 : cap &= ~HT_CAP_INFO_RX_STBC_MASK;
474 :
475 2415 : neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
476 : }
477 :
478 :
479 3 : void ap_ht2040_timeout(void *eloop_data, void *user_data)
480 : {
481 3 : struct hostapd_iface *iface = eloop_data;
482 :
483 3 : wpa_printf(MSG_INFO, "Switching to 40 MHz operation");
484 :
485 3 : iface->conf->secondary_channel = iface->secondary_ch;
486 3 : ieee802_11_set_beacons(iface);
487 3 : }
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