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 11971 : u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
25 : {
26 : struct ieee80211_ht_capabilities *cap;
27 11971 : u8 *pos = eid;
28 :
29 23873 : if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode ||
30 11902 : hapd->conf->disable_11n)
31 262 : return eid;
32 :
33 11709 : *pos++ = WLAN_EID_HT_CAP;
34 11709 : *pos++ = sizeof(*cap);
35 :
36 11709 : cap = (struct ieee80211_ht_capabilities *) pos;
37 11709 : os_memset(cap, 0, sizeof(*cap));
38 11709 : cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
39 11709 : cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
40 11709 : 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 11709 : pos += sizeof(*cap);
48 :
49 11709 : if (hapd->iconf->obss_interval) {
50 : struct ieee80211_obss_scan_parameters *scan_params;
51 :
52 20 : *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS;
53 20 : *pos++ = sizeof(*scan_params);
54 :
55 20 : scan_params = (struct ieee80211_obss_scan_parameters *) pos;
56 20 : os_memset(scan_params, 0, sizeof(*scan_params));
57 20 : scan_params->width_trigger_scan_interval =
58 20 : 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 20 : scan_params->scan_passive_dwell =
63 : host_to_le16(20);
64 20 : scan_params->scan_active_dwell =
65 : host_to_le16(10);
66 20 : scan_params->scan_passive_total_per_channel =
67 : host_to_le16(200);
68 20 : scan_params->scan_active_total_per_channel =
69 : host_to_le16(20);
70 20 : scan_params->channel_transition_delay_factor =
71 : host_to_le16(5);
72 20 : scan_params->scan_activity_threshold =
73 : host_to_le16(25);
74 :
75 20 : pos += sizeof(*scan_params);
76 : }
77 :
78 11709 : return pos;
79 : }
80 :
81 :
82 11971 : u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
83 : {
84 : struct ieee80211_ht_operation *oper;
85 11971 : u8 *pos = eid;
86 :
87 11971 : if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
88 262 : return eid;
89 :
90 11709 : *pos++ = WLAN_EID_HT_OPERATION;
91 11709 : *pos++ = sizeof(*oper);
92 :
93 11709 : oper = (struct ieee80211_ht_operation *) pos;
94 11709 : os_memset(oper, 0, sizeof(*oper));
95 :
96 11709 : oper->primary_chan = hapd->iconf->channel;
97 11709 : oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
98 11709 : if (hapd->iconf->secondary_channel == 1)
99 130 : oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
100 : HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
101 11709 : if (hapd->iconf->secondary_channel == -1)
102 49 : oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
103 : HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
104 :
105 11709 : pos += sizeof(*oper);
106 :
107 11709 : 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 6377 : int hostapd_ht_operation_update(struct hostapd_iface *iface)
123 : {
124 : u16 cur_op_mode, new_op_mode;
125 6377 : int op_mode_changes = 0;
126 :
127 6377 : if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
128 21 : return 0;
129 :
130 6356 : wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
131 6356 : __func__, iface->ht_op_mode);
132 :
133 6356 : if (!(iface->ht_op_mode & HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT)
134 6356 : && 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 6356 : } 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 12583 : if (!(iface->ht_op_mode & HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
145 12388 : (iface->num_sta_no_ht || iface->olbc_ht)) {
146 72 : iface->ht_op_mode |= HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
147 72 : op_mode_changes++;
148 6284 : } else if ((iface->ht_op_mode &
149 129 : HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
150 201 : (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
151 67 : iface->ht_op_mode &= ~HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
152 67 : op_mode_changes++;
153 : }
154 :
155 6356 : if (iface->num_sta_no_ht)
156 123 : new_op_mode = HT_PROT_NON_HT_MIXED;
157 6233 : else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz)
158 0 : new_op_mode = HT_PROT_20MHZ_PROTECTION;
159 6233 : else if (iface->olbc_ht)
160 11 : new_op_mode = HT_PROT_NONMEMBER_PROTECTION;
161 : else
162 6222 : new_op_mode = HT_PROT_NO_PROTECTION;
163 :
164 6356 : cur_op_mode = iface->ht_op_mode & HT_OPER_OP_MODE_HT_PROT_MASK;
165 6356 : if (cur_op_mode != new_op_mode) {
166 141 : iface->ht_op_mode &= ~HT_OPER_OP_MODE_HT_PROT_MASK;
167 141 : iface->ht_op_mode |= new_op_mode;
168 141 : op_mode_changes++;
169 : }
170 :
171 6356 : wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
172 6356 : __func__, iface->ht_op_mode, op_mode_changes);
173 :
174 6356 : 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_ht40_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_ht40_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_ht40_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_ht40_allowed = 0;
280 : }
281 : }
282 7 : wpa_printf(MSG_DEBUG, "is_ht40_allowed=%d num_sta_ht40_intolerant=%d",
283 : is_ht40_allowed, iface->num_sta_ht40_intolerant);
284 :
285 10 : if (!is_ht40_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 3399 : u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta,
313 : const u8 *ht_capab)
314 : {
315 : /*
316 : * Disable HT caps for STAs associated to no-HT BSSes, or for stations
317 : * that did not specify a valid WMM IE in the (Re)Association Request
318 : * frame.
319 : */
320 6711 : if (!ht_capab ||
321 6578 : !(sta->flags & WLAN_STA_WMM) || hapd->conf->disable_11n) {
322 133 : sta->flags &= ~WLAN_STA_HT;
323 133 : os_free(sta->ht_capabilities);
324 133 : sta->ht_capabilities = NULL;
325 133 : return WLAN_STATUS_SUCCESS;
326 : }
327 :
328 3266 : if (sta->ht_capabilities == NULL) {
329 2895 : sta->ht_capabilities =
330 2895 : os_zalloc(sizeof(struct ieee80211_ht_capabilities));
331 2895 : if (sta->ht_capabilities == NULL)
332 0 : return WLAN_STATUS_UNSPECIFIED_FAILURE;
333 : }
334 :
335 3266 : sta->flags |= WLAN_STA_HT;
336 3266 : os_memcpy(sta->ht_capabilities, ht_capab,
337 : sizeof(struct ieee80211_ht_capabilities));
338 :
339 3266 : return WLAN_STATUS_SUCCESS;
340 : }
341 :
342 :
343 1 : void ht40_intolerant_add(struct hostapd_iface *iface, struct sta_info *sta)
344 : {
345 1 : if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
346 0 : return;
347 :
348 6 : wpa_printf(MSG_INFO, "HT: Forty MHz Intolerant is set by STA " MACSTR
349 6 : " in Association Request", MAC2STR(sta->addr));
350 :
351 1 : if (sta->ht40_intolerant_set)
352 0 : return;
353 :
354 1 : sta->ht40_intolerant_set = 1;
355 1 : iface->num_sta_ht40_intolerant++;
356 1 : eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
357 :
358 2 : if (iface->conf->secondary_channel &&
359 1 : (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
360 1 : iface->conf->secondary_channel = 0;
361 1 : ieee802_11_set_beacons(iface);
362 : }
363 : }
364 :
365 :
366 3010 : void ht40_intolerant_remove(struct hostapd_iface *iface, struct sta_info *sta)
367 : {
368 3010 : if (!sta->ht40_intolerant_set)
369 6019 : return;
370 :
371 1 : sta->ht40_intolerant_set = 0;
372 1 : iface->num_sta_ht40_intolerant--;
373 :
374 2 : if (iface->num_sta_ht40_intolerant == 0 &&
375 2 : (iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
376 1 : (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
377 1 : unsigned int delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
378 1 : iface->conf->obss_interval;
379 1 : wpa_printf(MSG_DEBUG,
380 : "HT: Start 20->40 MHz transition timer (%d seconds)",
381 : delay_time);
382 1 : eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
383 1 : eloop_register_timeout(delay_time, 0, ap_ht2040_timeout,
384 : iface, NULL);
385 : }
386 : }
387 :
388 :
389 3257 : static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
390 : {
391 : u16 ht_capab;
392 :
393 3257 : ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
394 22799 : wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
395 19542 : "0x%04x", MAC2STR(sta->addr), ht_capab);
396 3257 : if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
397 0 : if (!sta->no_ht_gf_set) {
398 0 : sta->no_ht_gf_set = 1;
399 0 : hapd->iface->num_sta_ht_no_gf++;
400 : }
401 0 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
402 : "of non-gf stations %d",
403 0 : __func__, MAC2STR(sta->addr),
404 0 : hapd->iface->num_sta_ht_no_gf);
405 : }
406 3257 : if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
407 3214 : if (!sta->ht_20mhz_set) {
408 2850 : sta->ht_20mhz_set = 1;
409 2850 : hapd->iface->num_sta_ht_20mhz++;
410 : }
411 22498 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
412 : "20MHz HT STAs %d",
413 19284 : __func__, MAC2STR(sta->addr),
414 3214 : hapd->iface->num_sta_ht_20mhz);
415 : }
416 :
417 3257 : if (ht_capab & HT_CAP_INFO_40MHZ_INTOLERANT)
418 1 : ht40_intolerant_add(hapd->iface, sta);
419 3257 : }
420 :
421 :
422 103 : static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
423 : {
424 103 : if (!sta->no_ht_set) {
425 90 : sta->no_ht_set = 1;
426 90 : hapd->iface->num_sta_no_ht++;
427 : }
428 103 : if (hapd->iconf->ieee80211n) {
429 679 : wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
430 : "non-HT stations %d",
431 582 : __func__, MAC2STR(sta->addr),
432 97 : hapd->iface->num_sta_no_ht);
433 : }
434 103 : }
435 :
436 :
437 3360 : void update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
438 : {
439 3360 : if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
440 3257 : update_sta_ht(hapd, sta);
441 : else
442 103 : update_sta_no_ht(hapd, sta);
443 :
444 3360 : if (hostapd_ht_operation_update(hapd->iface) > 0)
445 67 : ieee802_11_set_beacons(hapd->iface);
446 3360 : }
447 :
448 :
449 3257 : void hostapd_get_ht_capab(struct hostapd_data *hapd,
450 : struct ieee80211_ht_capabilities *ht_cap,
451 : struct ieee80211_ht_capabilities *neg_ht_cap)
452 : {
453 : u16 cap;
454 :
455 3257 : if (ht_cap == NULL)
456 3257 : return;
457 3257 : os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
458 3257 : cap = le_to_host16(neg_ht_cap->ht_capabilities_info);
459 :
460 : /*
461 : * Mask out HT features we don't support, but don't overwrite
462 : * non-symmetric features like STBC and SMPS. Just because
463 : * we're not in dynamic SMPS mode the STA might still be.
464 : */
465 3257 : cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK |
466 : HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK);
467 :
468 : /*
469 : * STBC needs to be handled specially
470 : * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
471 : * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
472 : */
473 3257 : if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
474 3257 : cap &= ~HT_CAP_INFO_TX_STBC;
475 3257 : if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
476 3257 : cap &= ~HT_CAP_INFO_RX_STBC_MASK;
477 :
478 3257 : neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
479 : }
480 :
481 :
482 3 : void ap_ht2040_timeout(void *eloop_data, void *user_data)
483 : {
484 3 : struct hostapd_iface *iface = eloop_data;
485 :
486 3 : wpa_printf(MSG_INFO, "Switching to 40 MHz operation");
487 :
488 3 : iface->conf->secondary_channel = iface->secondary_ch;
489 3 : ieee802_11_set_beacons(iface);
490 3 : }
|
