1 /* 2 * hostapd / IEEE 802.11n HT 3 * Copyright (c) 2002-2009, Jouni Malinen <j (at) 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 u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid) 25 { 26 struct ieee80211_ht_capabilities *cap; 27 u8 *pos = eid; 28 29 if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode || 30 hapd->conf->disable_11n || is_6ghz_op_class(hapd->iconf->op_class)) 31 return eid; 32 33 *pos++ = WLAN_EID_HT_CAP; 34 *pos++ = sizeof(*cap); 35 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, 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 pos += sizeof(*cap); 48 49 if (hapd->iconf->obss_interval) { 50 struct ieee80211_obss_scan_parameters *scan_params; 51 52 *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS; 53 *pos++ = sizeof(*scan_params); 54 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); 59 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 = 63 host_to_le16(20); 64 scan_params->scan_active_dwell = 65 host_to_le16(10); 66 scan_params->scan_passive_total_per_channel = 67 host_to_le16(200); 68 scan_params->scan_active_total_per_channel = 69 host_to_le16(20); 70 scan_params->channel_transition_delay_factor = 71 host_to_le16(5); 72 scan_params->scan_activity_threshold = 73 host_to_le16(25); 74 75 pos += sizeof(*scan_params); 76 } 77 78 return pos; 79 } 80 81 82 u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid) 83 { 84 struct ieee80211_ht_operation *oper; 85 u8 *pos = eid; 86 87 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n || 88 is_6ghz_op_class(hapd->iconf->op_class)) 89 return eid; 90 91 *pos++ = WLAN_EID_HT_OPERATION; 92 *pos++ = sizeof(*oper); 93 94 oper = (struct ieee80211_ht_operation *) pos; 95 os_memset(oper, 0, sizeof(*oper)); 96 97 oper->primary_chan = hapd->iconf->channel; 98 oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode); 99 if (hapd->iconf->secondary_channel == 1) 100 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE | 101 HT_INFO_HT_PARAM_STA_CHNL_WIDTH; 102 if (hapd->iconf->secondary_channel == -1) 103 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW | 104 HT_INFO_HT_PARAM_STA_CHNL_WIDTH; 105 106 pos += sizeof(*oper); 107 108 return pos; 109 } 110 111 112 /* 113 op_mode 114 Set to 0 (HT pure) under the following conditions 115 - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or 116 - all STAs in the BSS are 20 MHz HT in 20 MHz BSS 117 Set to 1 (HT non-member protection) if there may be non-HT STAs 118 in both the primary and the secondary channel 119 Set to 2 if only HT STAs are associated in BSS, 120 however and at least one 20 MHz HT STA is associated 121 Set to 3 (HT mixed mode) when one or more non-HT STAs are associated 122 */ 123 int hostapd_ht_operation_update(struct hostapd_iface *iface) 124 { 125 u16 cur_op_mode, new_op_mode; 126 int op_mode_changes = 0; 127 128 if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed) 129 return 0; 130 131 wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X", 132 __func__, iface->ht_op_mode); 133 134 if (!(iface->ht_op_mode & HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT) 135 && iface->num_sta_ht_no_gf) { 136 iface->ht_op_mode |= HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT; 137 op_mode_changes++; 138 } else if ((iface->ht_op_mode & 139 HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT) && 140 iface->num_sta_ht_no_gf == 0) { 141 iface->ht_op_mode &= ~HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT; 142 op_mode_changes++; 143 } 144 145 if (!(iface->ht_op_mode & HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) && 146 (iface->num_sta_no_ht || iface->olbc_ht)) { 147 iface->ht_op_mode |= HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT; 148 op_mode_changes++; 149 } else if ((iface->ht_op_mode & 150 HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) && 151 (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) { 152 iface->ht_op_mode &= ~HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT; 153 op_mode_changes++; 154 } 155 156 if (iface->num_sta_no_ht) 157 new_op_mode = HT_PROT_NON_HT_MIXED; 158 else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz) 159 new_op_mode = HT_PROT_20MHZ_PROTECTION; 160 else if (iface->olbc_ht) 161 new_op_mode = HT_PROT_NONMEMBER_PROTECTION; 162 else 163 new_op_mode = HT_PROT_NO_PROTECTION; 164 165 cur_op_mode = iface->ht_op_mode & HT_OPER_OP_MODE_HT_PROT_MASK; 166 if (cur_op_mode != new_op_mode) { 167 iface->ht_op_mode &= ~HT_OPER_OP_MODE_HT_PROT_MASK; 168 iface->ht_op_mode |= new_op_mode; 169 op_mode_changes++; 170 } 171 172 wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d", 173 __func__, iface->ht_op_mode, op_mode_changes); 174 175 return op_mode_changes; 176 } 177 178 179 static int is_40_allowed(struct hostapd_iface *iface, int channel) 180 { 181 int pri_freq, sec_freq; 182 int affected_start, affected_end; 183 int pri = 2407 + 5 * channel; 184 185 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 186 return 1; 187 188 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel); 189 190 if (iface->conf->secondary_channel > 0) 191 sec_freq = pri_freq + 20; 192 else 193 sec_freq = pri_freq - 20; 194 195 affected_start = (pri_freq + sec_freq) / 2 - 25; 196 affected_end = (pri_freq + sec_freq) / 2 + 25; 197 if ((pri < affected_start || pri > affected_end)) 198 return 1; /* not within affected channel range */ 199 200 wpa_printf(MSG_ERROR, "40 MHz affected channel range: [%d,%d] MHz", 201 affected_start, affected_end); 202 wpa_printf(MSG_ERROR, "Neighboring BSS: freq=%d", pri); 203 return 0; 204 } 205 206 207 void hostapd_2040_coex_action(struct hostapd_data *hapd, 208 const struct ieee80211_mgmt *mgmt, size_t len) 209 { 210 struct hostapd_iface *iface = hapd->iface; 211 struct ieee80211_2040_bss_coex_ie *bc_ie; 212 struct ieee80211_2040_intol_chan_report *ic_report; 213 int is_ht40_allowed = 1; 214 int i; 215 const u8 *start = (const u8 *) mgmt; 216 const u8 *data = start + IEEE80211_HDRLEN + 2; 217 struct sta_info *sta; 218 219 wpa_printf(MSG_DEBUG, 220 "HT: Received 20/40 BSS Coexistence Management frame from " 221 MACSTR, MAC2STR(mgmt->sa)); 222 223 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211, 224 HOSTAPD_LEVEL_DEBUG, "hostapd_public_action - action=%d", 225 mgmt->u.action.u.public_action.action); 226 227 if (!(iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) { 228 wpa_printf(MSG_DEBUG, 229 "Ignore 20/40 BSS Coexistence Management frame since 40 MHz capability is not enabled"); 230 return; 231 } 232 233 if (len < IEEE80211_HDRLEN + 2 + sizeof(*bc_ie)) { 234 wpa_printf(MSG_DEBUG, 235 "Ignore too short 20/40 BSS Coexistence Management frame"); 236 return; 237 } 238 239 /* 20/40 BSS Coexistence element */ 240 bc_ie = (struct ieee80211_2040_bss_coex_ie *) data; 241 if (bc_ie->element_id != WLAN_EID_20_40_BSS_COEXISTENCE || 242 bc_ie->length < 1) { 243 wpa_printf(MSG_DEBUG, "Unexpected IE (%u,%u) in coex report", 244 bc_ie->element_id, bc_ie->length); 245 return; 246 } 247 if (len < IEEE80211_HDRLEN + 2 + 2 + bc_ie->length) { 248 wpa_printf(MSG_DEBUG, 249 "Truncated 20/40 BSS Coexistence element"); 250 return; 251 } 252 data += 2 + bc_ie->length; 253 254 wpa_printf(MSG_DEBUG, 255 "20/40 BSS Coexistence Information field: 0x%x (%s%s%s%s%s%s)", 256 bc_ie->coex_param, 257 (bc_ie->coex_param & BIT(0)) ? "[InfoReq]" : "", 258 (bc_ie->coex_param & BIT(1)) ? "[40MHzIntolerant]" : "", 259 (bc_ie->coex_param & BIT(2)) ? "[20MHzBSSWidthReq]" : "", 260 (bc_ie->coex_param & BIT(3)) ? "[OBSSScanExemptionReq]" : "", 261 (bc_ie->coex_param & BIT(4)) ? 262 "[OBSSScanExemptionGrant]" : "", 263 (bc_ie->coex_param & (BIT(5) | BIT(6) | BIT(7))) ? 264 "[Reserved]" : ""); 265 266 if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_20MHZ_WIDTH_REQ) { 267 /* Intra-BSS communication prohibiting 20/40 MHz BSS operation 268 */ 269 sta = ap_get_sta(hapd, mgmt->sa); 270 if (!sta || !(sta->flags & WLAN_STA_ASSOC)) { 271 wpa_printf(MSG_DEBUG, 272 "Ignore intra-BSS 20/40 BSS Coexistence Management frame from not-associated STA"); 273 return; 274 } 275 276 hostapd_logger(hapd, mgmt->sa, 277 HOSTAPD_MODULE_IEEE80211, 278 HOSTAPD_LEVEL_DEBUG, 279 "20 MHz BSS width request bit is set in BSS coexistence information field"); 280 is_ht40_allowed = 0; 281 } 282 283 if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_40MHZ_INTOL) { 284 /* Inter-BSS communication prohibiting 20/40 MHz BSS operation 285 */ 286 hostapd_logger(hapd, mgmt->sa, 287 HOSTAPD_MODULE_IEEE80211, 288 HOSTAPD_LEVEL_DEBUG, 289 "40 MHz intolerant bit is set in BSS coexistence information field"); 290 is_ht40_allowed = 0; 291 } 292 293 /* 20/40 BSS Intolerant Channel Report element (zero or more times) */ 294 while (start + len - data >= 3 && 295 data[0] == WLAN_EID_20_40_BSS_INTOLERANT && data[1] >= 1) { 296 u8 ielen = data[1]; 297 298 if (ielen > start + len - data - 2) { 299 wpa_printf(MSG_DEBUG, 300 "Truncated 20/40 BSS Intolerant Channel Report element"); 301 return; 302 } 303 ic_report = (struct ieee80211_2040_intol_chan_report *) data; 304 wpa_printf(MSG_DEBUG, 305 "20/40 BSS Intolerant Channel Report: Operating Class %u", 306 ic_report->op_class); 307 308 /* Go through the channel report to find any BSS there in the 309 * affected channel range */ 310 for (i = 0; i < ielen - 1; i++) { 311 u8 chan = ic_report->variable[i]; 312 313 if (chan == iface->conf->channel) 314 continue; /* matching own primary channel */ 315 if (is_40_allowed(iface, chan)) 316 continue; /* not within affected channels */ 317 hostapd_logger(hapd, mgmt->sa, 318 HOSTAPD_MODULE_IEEE80211, 319 HOSTAPD_LEVEL_DEBUG, 320 "20_40_INTOLERANT channel %d reported", 321 chan); 322 is_ht40_allowed = 0; 323 } 324 325 data += 2 + ielen; 326 } 327 wpa_printf(MSG_DEBUG, "is_ht40_allowed=%d num_sta_ht40_intolerant=%d", 328 is_ht40_allowed, iface->num_sta_ht40_intolerant); 329 330 if (!is_ht40_allowed && 331 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) { 332 if (iface->conf->secondary_channel) { 333 hostapd_logger(hapd, mgmt->sa, 334 HOSTAPD_MODULE_IEEE80211, 335 HOSTAPD_LEVEL_INFO, 336 "Switching to 20 MHz operation"); 337 iface->conf->secondary_channel = 0; 338 ieee802_11_set_beacons(iface); 339 } 340 if (!iface->num_sta_ht40_intolerant && 341 iface->conf->obss_interval) { 342 unsigned int delay_time; 343 delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR * 344 iface->conf->obss_interval; 345 eloop_cancel_timeout(ap_ht2040_timeout, hapd->iface, 346 NULL); 347 eloop_register_timeout(delay_time, 0, ap_ht2040_timeout, 348 hapd->iface, NULL); 349 wpa_printf(MSG_DEBUG, 350 "Reschedule HT 20/40 timeout to occur in %u seconds", 351 delay_time); 352 } 353 } 354 } 355 356 357 u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta, 358 const u8 *ht_capab) 359 { 360 /* 361 * Disable HT caps for STAs associated to no-HT BSSes, or for stations 362 * that did not specify a valid WMM IE in the (Re)Association Request 363 * frame. 364 */ 365 if (!ht_capab || !(sta->flags & WLAN_STA_WMM) || 366 !hapd->iconf->ieee80211n || hapd->conf->disable_11n) { 367 sta->flags &= ~WLAN_STA_HT; 368 os_free(sta->ht_capabilities); 369 sta->ht_capabilities = NULL; 370 return WLAN_STATUS_SUCCESS; 371 } 372 373 if (sta->ht_capabilities == NULL) { 374 sta->ht_capabilities = 375 os_zalloc(sizeof(struct ieee80211_ht_capabilities)); 376 if (sta->ht_capabilities == NULL) 377 return WLAN_STATUS_UNSPECIFIED_FAILURE; 378 } 379 380 sta->flags |= WLAN_STA_HT; 381 os_memcpy(sta->ht_capabilities, ht_capab, 382 sizeof(struct ieee80211_ht_capabilities)); 383 384 return WLAN_STATUS_SUCCESS; 385 } 386 387 388 void ht40_intolerant_add(struct hostapd_iface *iface, struct sta_info *sta) 389 { 390 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G) 391 return; 392 393 wpa_printf(MSG_INFO, "HT: Forty MHz Intolerant is set by STA " MACSTR 394 " in Association Request", MAC2STR(sta->addr)); 395 396 if (sta->ht40_intolerant_set) 397 return; 398 399 sta->ht40_intolerant_set = 1; 400 iface->num_sta_ht40_intolerant++; 401 eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL); 402 403 if (iface->conf->secondary_channel && 404 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) { 405 iface->conf->secondary_channel = 0; 406 ieee802_11_set_beacons(iface); 407 } 408 } 409 410 411 void ht40_intolerant_remove(struct hostapd_iface *iface, struct sta_info *sta) 412 { 413 if (!sta->ht40_intolerant_set) 414 return; 415 416 sta->ht40_intolerant_set = 0; 417 iface->num_sta_ht40_intolerant--; 418 419 if (iface->num_sta_ht40_intolerant == 0 && 420 (iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) && 421 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) { 422 unsigned int delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR * 423 iface->conf->obss_interval; 424 wpa_printf(MSG_DEBUG, 425 "HT: Start 20->40 MHz transition timer (%d seconds)", 426 delay_time); 427 eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL); 428 eloop_register_timeout(delay_time, 0, ap_ht2040_timeout, 429 iface, NULL); 430 } 431 } 432 433 434 static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta) 435 { 436 u16 ht_capab; 437 438 ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info); 439 wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: " 440 "0x%04x", MAC2STR(sta->addr), ht_capab); 441 if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) { 442 if (!sta->no_ht_gf_set) { 443 sta->no_ht_gf_set = 1; 444 hapd->iface->num_sta_ht_no_gf++; 445 } 446 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num " 447 "of non-gf stations %d", 448 __func__, MAC2STR(sta->addr), 449 hapd->iface->num_sta_ht_no_gf); 450 } 451 if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) { 452 if (!sta->ht_20mhz_set) { 453 sta->ht_20mhz_set = 1; 454 hapd->iface->num_sta_ht_20mhz++; 455 } 456 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of " 457 "20MHz HT STAs %d", 458 __func__, MAC2STR(sta->addr), 459 hapd->iface->num_sta_ht_20mhz); 460 } 461 462 if (ht_capab & HT_CAP_INFO_40MHZ_INTOLERANT) 463 ht40_intolerant_add(hapd->iface, sta); 464 } 465 466 467 static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta) 468 { 469 if (!sta->no_ht_set) { 470 sta->no_ht_set = 1; 471 hapd->iface->num_sta_no_ht++; 472 } 473 if (hapd->iconf->ieee80211n) { 474 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of " 475 "non-HT stations %d", 476 __func__, MAC2STR(sta->addr), 477 hapd->iface->num_sta_no_ht); 478 } 479 } 480 481 482 int update_ht_state(struct hostapd_data *hapd, struct sta_info *sta) 483 { 484 if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities) 485 update_sta_ht(hapd, sta); 486 else 487 update_sta_no_ht(hapd, sta); 488 489 return hostapd_ht_operation_update(hapd->iface); 490 } 491 492 493 void hostapd_get_ht_capab(struct hostapd_data *hapd, 494 struct ieee80211_ht_capabilities *ht_cap, 495 struct ieee80211_ht_capabilities *neg_ht_cap) 496 { 497 u16 cap; 498 499 if (ht_cap == NULL) 500 return; 501 os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap)); 502 cap = le_to_host16(neg_ht_cap->ht_capabilities_info); 503 504 /* 505 * Mask out HT features we don't support, but don't overwrite 506 * non-symmetric features like STBC and SMPS. Just because 507 * we're not in dynamic SMPS mode the STA might still be. 508 */ 509 cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK | 510 HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK); 511 512 /* 513 * STBC needs to be handled specially 514 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps 515 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps 516 */ 517 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK)) 518 cap &= ~HT_CAP_INFO_TX_STBC; 519 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC)) 520 cap &= ~HT_CAP_INFO_RX_STBC_MASK; 521 522 neg_ht_cap->ht_capabilities_info = host_to_le16(cap); 523 } 524 525 526 void ap_ht2040_timeout(void *eloop_data, void *user_data) 527 { 528 struct hostapd_iface *iface = eloop_data; 529 530 wpa_printf(MSG_INFO, "Switching to 40 MHz operation"); 531 532 iface->conf->secondary_channel = iface->secondary_ch; 533 ieee802_11_set_beacons(iface); 534 } 535
Indexes created Sat Jun 20 00:25:23 UTC 2026