1 /* 2 * BSS client mode implementation 3 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 4 * Copyright 2004, Instant802 Networks, Inc. 5 * Copyright 2005, Devicescape Software, Inc. 6 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 7 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/delay.h> 15 #include <linux/if_ether.h> 16 #include <linux/skbuff.h> 17 #include <linux/if_arp.h> 18 #include <linux/wireless.h> 19 #include <linux/random.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <net/iw_handler.h> 23 #include <net/mac80211.h> 24 #include <asm/unaligned.h> 25 26 #include "ieee80211_i.h" 27 #include "rate.h" 28 #include "led.h" 29 30 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2 31 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 32 #define IEEE80211_AUTH_MAX_TRIES 3 33 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 34 #define IEEE80211_ASSOC_MAX_TRIES 3 35 #define IEEE80211_MONITORING_INTERVAL (2 * HZ) 36 #define IEEE80211_PROBE_INTERVAL (60 * HZ) 37 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ) 38 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 39 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) 40 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 41 42 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 43 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 44 45 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 46 47 48 /* utils */ 49 static int ecw2cw(int ecw) 50 { 51 return (1 << ecw) - 1; 52 } 53 54 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie) 55 { 56 u8 *end, *pos; 57 58 pos = bss->ies; 59 if (pos == NULL) 60 return NULL; 61 end = pos + bss->ies_len; 62 63 while (pos + 1 < end) { 64 if (pos + 2 + pos[1] > end) 65 break; 66 if (pos[0] == ie) 67 return pos; 68 pos += 2 + pos[1]; 69 } 70 71 return NULL; 72 } 73 74 static int ieee80211_compatible_rates(struct ieee80211_bss *bss, 75 struct ieee80211_supported_band *sband, 76 u64 *rates) 77 { 78 int i, j, count; 79 *rates = 0; 80 count = 0; 81 for (i = 0; i < bss->supp_rates_len; i++) { 82 int rate = (bss->supp_rates[i] & 0x7F) * 5; 83 84 for (j = 0; j < sband->n_bitrates; j++) 85 if (sband->bitrates[j].bitrate == rate) { 86 *rates |= BIT(j); 87 count++; 88 break; 89 } 90 } 91 92 return count; 93 } 94 95 /* also used by mesh code */ 96 u64 ieee80211_sta_get_rates(struct ieee80211_local *local, 97 struct ieee802_11_elems *elems, 98 enum ieee80211_band band) 99 { 100 struct ieee80211_supported_band *sband; 101 struct ieee80211_rate *bitrates; 102 size_t num_rates; 103 u64 supp_rates; 104 int i, j; 105 sband = local->hw.wiphy->bands[band]; 106 107 if (!sband) { 108 WARN_ON(1); 109 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 110 } 111 112 bitrates = sband->bitrates; 113 num_rates = sband->n_bitrates; 114 supp_rates = 0; 115 for (i = 0; i < elems->supp_rates_len + 116 elems->ext_supp_rates_len; i++) { 117 u8 rate = 0; 118 int own_rate; 119 if (i < elems->supp_rates_len) 120 rate = elems->supp_rates[i]; 121 else if (elems->ext_supp_rates) 122 rate = elems->ext_supp_rates 123 [i - elems->supp_rates_len]; 124 own_rate = 5 * (rate & 0x7f); 125 for (j = 0; j < num_rates; j++) 126 if (bitrates[j].bitrate == own_rate) 127 supp_rates |= BIT(j); 128 } 129 return supp_rates; 130 } 131 132 /* frame sending functions */ 133 134 /* also used by scanning code */ 135 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, 136 u8 *ssid, size_t ssid_len) 137 { 138 struct ieee80211_local *local = sdata->local; 139 struct ieee80211_supported_band *sband; 140 struct sk_buff *skb; 141 struct ieee80211_mgmt *mgmt; 142 u8 *pos, *supp_rates, *esupp_rates = NULL; 143 int i; 144 145 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200); 146 if (!skb) { 147 printk(KERN_DEBUG "%s: failed to allocate buffer for probe " 148 "request\n", sdata->dev->name); 149 return; 150 } 151 skb_reserve(skb, local->hw.extra_tx_headroom); 152 153 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 154 memset(mgmt, 0, 24); 155 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 156 IEEE80211_STYPE_PROBE_REQ); 157 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 158 if (dst) { 159 memcpy(mgmt->da, dst, ETH_ALEN); 160 memcpy(mgmt->bssid, dst, ETH_ALEN); 161 } else { 162 memset(mgmt->da, 0xff, ETH_ALEN); 163 memset(mgmt->bssid, 0xff, ETH_ALEN); 164 } 165 pos = skb_put(skb, 2 + ssid_len); 166 *pos++ = WLAN_EID_SSID; 167 *pos++ = ssid_len; 168 memcpy(pos, ssid, ssid_len); 169 170 supp_rates = skb_put(skb, 2); 171 supp_rates[0] = WLAN_EID_SUPP_RATES; 172 supp_rates[1] = 0; 173 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 174 175 for (i = 0; i < sband->n_bitrates; i++) { 176 struct ieee80211_rate *rate = &sband->bitrates[i]; 177 if (esupp_rates) { 178 pos = skb_put(skb, 1); 179 esupp_rates[1]++; 180 } else if (supp_rates[1] == 8) { 181 esupp_rates = skb_put(skb, 3); 182 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES; 183 esupp_rates[1] = 1; 184 pos = &esupp_rates[2]; 185 } else { 186 pos = skb_put(skb, 1); 187 supp_rates[1]++; 188 } 189 *pos = rate->bitrate / 5; 190 } 191 192 ieee80211_tx_skb(sdata, skb, 0); 193 } 194 195 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, 196 struct ieee80211_if_sta *ifsta, 197 int transaction, u8 *extra, size_t extra_len, 198 int encrypt) 199 { 200 struct ieee80211_local *local = sdata->local; 201 struct sk_buff *skb; 202 struct ieee80211_mgmt *mgmt; 203 204 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 205 sizeof(*mgmt) + 6 + extra_len); 206 if (!skb) { 207 printk(KERN_DEBUG "%s: failed to allocate buffer for auth " 208 "frame\n", sdata->dev->name); 209 return; 210 } 211 skb_reserve(skb, local->hw.extra_tx_headroom); 212 213 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6); 214 memset(mgmt, 0, 24 + 6); 215 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 216 IEEE80211_STYPE_AUTH); 217 if (encrypt) 218 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 219 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); 220 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 221 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 222 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg); 223 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction); 224 ifsta->auth_transaction = transaction + 1; 225 mgmt->u.auth.status_code = cpu_to_le16(0); 226 if (extra) 227 memcpy(skb_put(skb, extra_len), extra, extra_len); 228 229 ieee80211_tx_skb(sdata, skb, encrypt); 230 } 231 232 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, 233 struct ieee80211_if_sta *ifsta) 234 { 235 struct ieee80211_local *local = sdata->local; 236 struct sk_buff *skb; 237 struct ieee80211_mgmt *mgmt; 238 u8 *pos, *ies, *ht_ie; 239 int i, len, count, rates_len, supp_rates_len; 240 u16 capab; 241 struct ieee80211_bss *bss; 242 int wmm = 0; 243 struct ieee80211_supported_band *sband; 244 u64 rates = 0; 245 246 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 247 sizeof(*mgmt) + 200 + ifsta->extra_ie_len + 248 ifsta->ssid_len); 249 if (!skb) { 250 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc " 251 "frame\n", sdata->dev->name); 252 return; 253 } 254 skb_reserve(skb, local->hw.extra_tx_headroom); 255 256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 257 258 capab = ifsta->capab; 259 260 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) { 261 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) 262 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 263 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) 264 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 265 } 266 267 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 268 local->hw.conf.channel->center_freq, 269 ifsta->ssid, ifsta->ssid_len); 270 if (bss) { 271 if (bss->capability & WLAN_CAPABILITY_PRIVACY) 272 capab |= WLAN_CAPABILITY_PRIVACY; 273 if (bss->wmm_used) 274 wmm = 1; 275 276 /* get all rates supported by the device and the AP as 277 * some APs don't like getting a superset of their rates 278 * in the association request (e.g. D-Link DAP 1353 in 279 * b-only mode) */ 280 rates_len = ieee80211_compatible_rates(bss, sband, &rates); 281 282 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 283 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) 284 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 285 286 ieee80211_rx_bss_put(local, bss); 287 } else { 288 rates = ~0; 289 rates_len = sband->n_bitrates; 290 } 291 292 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 293 memset(mgmt, 0, 24); 294 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); 295 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 296 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 297 298 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) { 299 skb_put(skb, 10); 300 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 301 IEEE80211_STYPE_REASSOC_REQ); 302 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 303 mgmt->u.reassoc_req.listen_interval = 304 cpu_to_le16(local->hw.conf.listen_interval); 305 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid, 306 ETH_ALEN); 307 } else { 308 skb_put(skb, 4); 309 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 310 IEEE80211_STYPE_ASSOC_REQ); 311 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 312 mgmt->u.assoc_req.listen_interval = 313 cpu_to_le16(local->hw.conf.listen_interval); 314 } 315 316 /* SSID */ 317 ies = pos = skb_put(skb, 2 + ifsta->ssid_len); 318 *pos++ = WLAN_EID_SSID; 319 *pos++ = ifsta->ssid_len; 320 memcpy(pos, ifsta->ssid, ifsta->ssid_len); 321 322 /* add all rates which were marked to be used above */ 323 supp_rates_len = rates_len; 324 if (supp_rates_len > 8) 325 supp_rates_len = 8; 326 327 len = sband->n_bitrates; 328 pos = skb_put(skb, supp_rates_len + 2); 329 *pos++ = WLAN_EID_SUPP_RATES; 330 *pos++ = supp_rates_len; 331 332 count = 0; 333 for (i = 0; i < sband->n_bitrates; i++) { 334 if (BIT(i) & rates) { 335 int rate = sband->bitrates[i].bitrate; 336 *pos++ = (u8) (rate / 5); 337 if (++count == 8) 338 break; 339 } 340 } 341 342 if (rates_len > count) { 343 pos = skb_put(skb, rates_len - count + 2); 344 *pos++ = WLAN_EID_EXT_SUPP_RATES; 345 *pos++ = rates_len - count; 346 347 for (i++; i < sband->n_bitrates; i++) { 348 if (BIT(i) & rates) { 349 int rate = sband->bitrates[i].bitrate; 350 *pos++ = (u8) (rate / 5); 351 } 352 } 353 } 354 355 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 356 /* 1. power capabilities */ 357 pos = skb_put(skb, 4); 358 *pos++ = WLAN_EID_PWR_CAPABILITY; 359 *pos++ = 2; 360 *pos++ = 0; /* min tx power */ 361 *pos++ = local->hw.conf.channel->max_power; /* max tx power */ 362 363 /* 2. supported channels */ 364 /* TODO: get this in reg domain format */ 365 pos = skb_put(skb, 2 * sband->n_channels + 2); 366 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 367 *pos++ = 2 * sband->n_channels; 368 for (i = 0; i < sband->n_channels; i++) { 369 *pos++ = ieee80211_frequency_to_channel( 370 sband->channels[i].center_freq); 371 *pos++ = 1; /* one channel in the subband*/ 372 } 373 } 374 375 if (ifsta->extra_ie) { 376 pos = skb_put(skb, ifsta->extra_ie_len); 377 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len); 378 } 379 380 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) { 381 pos = skb_put(skb, 9); 382 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 383 *pos++ = 7; /* len */ 384 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 385 *pos++ = 0x50; 386 *pos++ = 0xf2; 387 *pos++ = 2; /* WME */ 388 *pos++ = 0; /* WME info */ 389 *pos++ = 1; /* WME ver */ 390 *pos++ = 0; 391 } 392 393 /* wmm support is a must to HT */ 394 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) && 395 sband->ht_cap.ht_supported && 396 (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) && 397 ht_ie[1] >= sizeof(struct ieee80211_ht_info)) { 398 struct ieee80211_ht_info *ht_info = 399 (struct ieee80211_ht_info *)(ht_ie + 2); 400 u16 cap = sband->ht_cap.cap; 401 __le16 tmp; 402 u32 flags = local->hw.conf.channel->flags; 403 404 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { 405 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: 406 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) { 407 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 408 cap &= ~IEEE80211_HT_CAP_SGI_40; 409 } 410 break; 411 case IEEE80211_HT_PARAM_CHA_SEC_BELOW: 412 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) { 413 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; 414 cap &= ~IEEE80211_HT_CAP_SGI_40; 415 } 416 break; 417 } 418 419 tmp = cpu_to_le16(cap); 420 pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2); 421 *pos++ = WLAN_EID_HT_CAPABILITY; 422 *pos++ = sizeof(struct ieee80211_ht_cap); 423 memset(pos, 0, sizeof(struct ieee80211_ht_cap)); 424 memcpy(pos, &tmp, sizeof(u16)); 425 pos += sizeof(u16); 426 /* TODO: needs a define here for << 2 */ 427 *pos++ = sband->ht_cap.ampdu_factor | 428 (sband->ht_cap.ampdu_density << 2); 429 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs)); 430 } 431 432 kfree(ifsta->assocreq_ies); 433 ifsta->assocreq_ies_len = (skb->data + skb->len) - ies; 434 ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL); 435 if (ifsta->assocreq_ies) 436 memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len); 437 438 ieee80211_tx_skb(sdata, skb, 0); 439 } 440 441 442 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata, 443 u16 stype, u16 reason) 444 { 445 struct ieee80211_local *local = sdata->local; 446 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 447 struct sk_buff *skb; 448 struct ieee80211_mgmt *mgmt; 449 450 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt)); 451 if (!skb) { 452 printk(KERN_DEBUG "%s: failed to allocate buffer for " 453 "deauth/disassoc frame\n", sdata->dev->name); 454 return; 455 } 456 skb_reserve(skb, local->hw.extra_tx_headroom); 457 458 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 459 memset(mgmt, 0, 24); 460 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); 461 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 462 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 463 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype); 464 skb_put(skb, 2); 465 /* u.deauth.reason_code == u.disassoc.reason_code */ 466 mgmt->u.deauth.reason_code = cpu_to_le16(reason); 467 468 ieee80211_tx_skb(sdata, skb, 0); 469 } 470 471 /* MLME */ 472 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata, 473 struct ieee80211_bss *bss) 474 { 475 struct ieee80211_local *local = sdata->local; 476 int i, have_higher_than_11mbit = 0; 477 478 /* cf. IEEE 802.11 9.2.12 */ 479 for (i = 0; i < bss->supp_rates_len; i++) 480 if ((bss->supp_rates[i] & 0x7f) * 5 > 110) 481 have_higher_than_11mbit = 1; 482 483 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && 484 have_higher_than_11mbit) 485 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 486 else 487 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 488 489 ieee80211_set_wmm_default(sdata); 490 } 491 492 static void ieee80211_sta_wmm_params(struct ieee80211_local *local, 493 struct ieee80211_if_sta *ifsta, 494 u8 *wmm_param, size_t wmm_param_len) 495 { 496 struct ieee80211_tx_queue_params params; 497 size_t left; 498 int count; 499 u8 *pos; 500 501 if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED)) 502 return; 503 504 if (!wmm_param) 505 return; 506 507 if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1) 508 return; 509 count = wmm_param[6] & 0x0f; 510 if (count == ifsta->wmm_last_param_set) 511 return; 512 ifsta->wmm_last_param_set = count; 513 514 pos = wmm_param + 8; 515 left = wmm_param_len - 8; 516 517 memset(¶ms, 0, sizeof(params)); 518 519 if (!local->ops->conf_tx) 520 return; 521 522 local->wmm_acm = 0; 523 for (; left >= 4; left -= 4, pos += 4) { 524 int aci = (pos[0] >> 5) & 0x03; 525 int acm = (pos[0] >> 4) & 0x01; 526 int queue; 527 528 switch (aci) { 529 case 1: 530 queue = 3; 531 if (acm) 532 local->wmm_acm |= BIT(0) | BIT(3); 533 break; 534 case 2: 535 queue = 1; 536 if (acm) 537 local->wmm_acm |= BIT(4) | BIT(5); 538 break; 539 case 3: 540 queue = 0; 541 if (acm) 542 local->wmm_acm |= BIT(6) | BIT(7); 543 break; 544 case 0: 545 default: 546 queue = 2; 547 if (acm) 548 local->wmm_acm |= BIT(1) | BIT(2); 549 break; 550 } 551 552 params.aifs = pos[0] & 0x0f; 553 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4); 554 params.cw_min = ecw2cw(pos[1] & 0x0f); 555 params.txop = get_unaligned_le16(pos + 2); 556 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 557 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d " 558 "cWmin=%d cWmax=%d txop=%d\n", 559 local->mdev->name, queue, aci, acm, params.aifs, params.cw_min, 560 params.cw_max, params.txop); 561 #endif 562 /* TODO: handle ACM (block TX, fallback to next lowest allowed 563 * AC for now) */ 564 if (local->ops->conf_tx(local_to_hw(local), queue, ¶ms)) { 565 printk(KERN_DEBUG "%s: failed to set TX queue " 566 "parameters for queue %d\n", local->mdev->name, queue); 567 } 568 } 569 } 570 571 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 572 u16 capab, bool erp_valid, u8 erp) 573 { 574 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 576 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 577 #endif 578 u32 changed = 0; 579 bool use_protection; 580 bool use_short_preamble; 581 bool use_short_slot; 582 583 if (erp_valid) { 584 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0; 585 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0; 586 } else { 587 use_protection = false; 588 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE); 589 } 590 591 use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME); 592 593 if (use_protection != bss_conf->use_cts_prot) { 594 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 595 if (net_ratelimit()) { 596 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n", 597 sdata->dev->name, 598 use_protection ? "enabled" : "disabled", 599 ifsta->bssid); 600 } 601 #endif 602 bss_conf->use_cts_prot = use_protection; 603 changed |= BSS_CHANGED_ERP_CTS_PROT; 604 } 605 606 if (use_short_preamble != bss_conf->use_short_preamble) { 607 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 608 if (net_ratelimit()) { 609 printk(KERN_DEBUG "%s: switched to %s barker preamble" 610 " (BSSID=%pM)\n", 611 sdata->dev->name, 612 use_short_preamble ? "short" : "long", 613 ifsta->bssid); 614 } 615 #endif 616 bss_conf->use_short_preamble = use_short_preamble; 617 changed |= BSS_CHANGED_ERP_PREAMBLE; 618 } 619 620 if (use_short_slot != bss_conf->use_short_slot) { 621 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 622 if (net_ratelimit()) { 623 printk(KERN_DEBUG "%s: switched to %s slot time" 624 " (BSSID=%pM)\n", 625 sdata->dev->name, 626 use_short_slot ? "short" : "long", 627 ifsta->bssid); 628 } 629 #endif 630 bss_conf->use_short_slot = use_short_slot; 631 changed |= BSS_CHANGED_ERP_SLOT; 632 } 633 634 return changed; 635 } 636 637 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata, 638 struct ieee80211_if_sta *ifsta) 639 { 640 union iwreq_data wrqu; 641 memset(&wrqu, 0, sizeof(wrqu)); 642 if (ifsta->flags & IEEE80211_STA_ASSOCIATED) 643 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN); 644 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 645 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL); 646 } 647 648 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata, 649 struct ieee80211_if_sta *ifsta) 650 { 651 char *buf; 652 size_t len; 653 int i; 654 union iwreq_data wrqu; 655 656 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies) 657 return; 658 659 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len + 660 ifsta->assocresp_ies_len), GFP_KERNEL); 661 if (!buf) 662 return; 663 664 len = sprintf(buf, "ASSOCINFO("); 665 if (ifsta->assocreq_ies) { 666 len += sprintf(buf + len, "ReqIEs="); 667 for (i = 0; i < ifsta->assocreq_ies_len; i++) { 668 len += sprintf(buf + len, "%02x", 669 ifsta->assocreq_ies[i]); 670 } 671 } 672 if (ifsta->assocresp_ies) { 673 if (ifsta->assocreq_ies) 674 len += sprintf(buf + len, " "); 675 len += sprintf(buf + len, "RespIEs="); 676 for (i = 0; i < ifsta->assocresp_ies_len; i++) { 677 len += sprintf(buf + len, "%02x", 678 ifsta->assocresp_ies[i]); 679 } 680 } 681 len += sprintf(buf + len, ")"); 682 683 if (len > IW_CUSTOM_MAX) { 684 len = sprintf(buf, "ASSOCRESPIE="); 685 for (i = 0; i < ifsta->assocresp_ies_len; i++) { 686 len += sprintf(buf + len, "%02x", 687 ifsta->assocresp_ies[i]); 688 } 689 } 690 691 if (len <= IW_CUSTOM_MAX) { 692 memset(&wrqu, 0, sizeof(wrqu)); 693 wrqu.data.length = len; 694 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf); 695 } 696 697 kfree(buf); 698 } 699 700 701 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 702 struct ieee80211_if_sta *ifsta, 703 u32 bss_info_changed) 704 { 705 struct ieee80211_local *local = sdata->local; 706 struct ieee80211_conf *conf = &local_to_hw(local)->conf; 707 708 struct ieee80211_bss *bss; 709 710 bss_info_changed |= BSS_CHANGED_ASSOC; 711 ifsta->flags |= IEEE80211_STA_ASSOCIATED; 712 713 if (sdata->vif.type != NL80211_IFTYPE_STATION) 714 return; 715 716 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 717 conf->channel->center_freq, 718 ifsta->ssid, ifsta->ssid_len); 719 if (bss) { 720 /* set timing information */ 721 sdata->vif.bss_conf.beacon_int = bss->beacon_int; 722 sdata->vif.bss_conf.timestamp = bss->timestamp; 723 sdata->vif.bss_conf.dtim_period = bss->dtim_period; 724 725 bss_info_changed |= ieee80211_handle_bss_capability(sdata, 726 bss->capability, bss->has_erp_value, bss->erp_value); 727 728 ieee80211_rx_bss_put(local, bss); 729 } 730 731 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET; 732 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN); 733 ieee80211_sta_send_associnfo(sdata, ifsta); 734 735 ifsta->last_probe = jiffies; 736 ieee80211_led_assoc(local, 1); 737 738 sdata->vif.bss_conf.assoc = 1; 739 /* 740 * For now just always ask the driver to update the basic rateset 741 * when we have associated, we aren't checking whether it actually 742 * changed or not. 743 */ 744 bss_info_changed |= BSS_CHANGED_BASIC_RATES; 745 ieee80211_bss_info_change_notify(sdata, bss_info_changed); 746 747 if (local->powersave) { 748 if (local->dynamic_ps_timeout > 0) 749 mod_timer(&local->dynamic_ps_timer, jiffies + 750 msecs_to_jiffies(local->dynamic_ps_timeout)); 751 else { 752 conf->flags |= IEEE80211_CONF_PS; 753 ieee80211_hw_config(local, 754 IEEE80211_CONF_CHANGE_PS); 755 } 756 } 757 758 netif_tx_start_all_queues(sdata->dev); 759 netif_carrier_on(sdata->dev); 760 761 ieee80211_sta_send_apinfo(sdata, ifsta); 762 } 763 764 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata, 765 struct ieee80211_if_sta *ifsta) 766 { 767 ifsta->direct_probe_tries++; 768 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) { 769 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n", 770 sdata->dev->name, ifsta->bssid); 771 ifsta->state = IEEE80211_STA_MLME_DISABLED; 772 ieee80211_sta_send_apinfo(sdata, ifsta); 773 return; 774 } 775 776 printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n", 777 sdata->dev->name, ifsta->bssid, 778 ifsta->direct_probe_tries); 779 780 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; 781 782 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request); 783 784 /* Direct probe is sent to broadcast address as some APs 785 * will not answer to direct packet in unassociated state. 786 */ 787 ieee80211_send_probe_req(sdata, NULL, 788 ifsta->ssid, ifsta->ssid_len); 789 790 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT); 791 } 792 793 794 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata, 795 struct ieee80211_if_sta *ifsta) 796 { 797 ifsta->auth_tries++; 798 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) { 799 printk(KERN_DEBUG "%s: authentication with AP %pM" 800 " timed out\n", 801 sdata->dev->name, ifsta->bssid); 802 ifsta->state = IEEE80211_STA_MLME_DISABLED; 803 ieee80211_sta_send_apinfo(sdata, ifsta); 804 return; 805 } 806 807 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; 808 printk(KERN_DEBUG "%s: authenticate with AP %pM\n", 809 sdata->dev->name, ifsta->bssid); 810 811 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0); 812 813 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT); 814 } 815 816 /* 817 * The disassoc 'reason' argument can be either our own reason 818 * if self disconnected or a reason code from the AP. 819 */ 820 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 821 struct ieee80211_if_sta *ifsta, bool deauth, 822 bool self_disconnected, u16 reason) 823 { 824 struct ieee80211_local *local = sdata->local; 825 struct sta_info *sta; 826 u32 changed = 0, config_changed = 0; 827 828 rcu_read_lock(); 829 830 sta = sta_info_get(local, ifsta->bssid); 831 if (!sta) { 832 rcu_read_unlock(); 833 return; 834 } 835 836 if (deauth) { 837 ifsta->direct_probe_tries = 0; 838 ifsta->auth_tries = 0; 839 } 840 ifsta->assoc_scan_tries = 0; 841 ifsta->assoc_tries = 0; 842 843 netif_tx_stop_all_queues(sdata->dev); 844 netif_carrier_off(sdata->dev); 845 846 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr); 847 848 if (self_disconnected) { 849 if (deauth) 850 ieee80211_send_deauth_disassoc(sdata, 851 IEEE80211_STYPE_DEAUTH, reason); 852 else 853 ieee80211_send_deauth_disassoc(sdata, 854 IEEE80211_STYPE_DISASSOC, reason); 855 } 856 857 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED; 858 changed |= ieee80211_reset_erp_info(sdata); 859 860 ieee80211_led_assoc(local, 0); 861 changed |= BSS_CHANGED_ASSOC; 862 sdata->vif.bss_conf.assoc = false; 863 864 ieee80211_sta_send_apinfo(sdata, ifsta); 865 866 if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) 867 ifsta->state = IEEE80211_STA_MLME_DISABLED; 868 869 rcu_read_unlock(); 870 871 local->hw.conf.ht.enabled = false; 872 local->oper_channel_type = NL80211_CHAN_NO_HT; 873 config_changed |= IEEE80211_CONF_CHANGE_HT; 874 875 del_timer_sync(&local->dynamic_ps_timer); 876 cancel_work_sync(&local->dynamic_ps_enable_work); 877 878 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 879 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 880 config_changed |= IEEE80211_CONF_CHANGE_PS; 881 } 882 883 ieee80211_hw_config(local, config_changed); 884 ieee80211_bss_info_change_notify(sdata, changed); 885 886 rcu_read_lock(); 887 888 sta = sta_info_get(local, ifsta->bssid); 889 if (!sta) { 890 rcu_read_unlock(); 891 return; 892 } 893 894 sta_info_unlink(&sta); 895 896 rcu_read_unlock(); 897 898 sta_info_destroy(sta); 899 } 900 901 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata) 902 { 903 if (!sdata || !sdata->default_key || 904 sdata->default_key->conf.alg != ALG_WEP) 905 return 0; 906 return 1; 907 } 908 909 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata, 910 struct ieee80211_if_sta *ifsta) 911 { 912 struct ieee80211_local *local = sdata->local; 913 struct ieee80211_bss *bss; 914 int bss_privacy; 915 int wep_privacy; 916 int privacy_invoked; 917 918 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL)) 919 return 0; 920 921 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 922 local->hw.conf.channel->center_freq, 923 ifsta->ssid, ifsta->ssid_len); 924 if (!bss) 925 return 0; 926 927 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY); 928 wep_privacy = !!ieee80211_sta_wep_configured(sdata); 929 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED); 930 931 ieee80211_rx_bss_put(local, bss); 932 933 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked)) 934 return 0; 935 936 return 1; 937 } 938 939 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata, 940 struct ieee80211_if_sta *ifsta) 941 { 942 ifsta->assoc_tries++; 943 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) { 944 printk(KERN_DEBUG "%s: association with AP %pM" 945 " timed out\n", 946 sdata->dev->name, ifsta->bssid); 947 ifsta->state = IEEE80211_STA_MLME_DISABLED; 948 ieee80211_sta_send_apinfo(sdata, ifsta); 949 return; 950 } 951 952 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE; 953 printk(KERN_DEBUG "%s: associate with AP %pM\n", 954 sdata->dev->name, ifsta->bssid); 955 if (ieee80211_privacy_mismatch(sdata, ifsta)) { 956 printk(KERN_DEBUG "%s: mismatch in privacy configuration and " 957 "mixed-cell disabled - abort association\n", sdata->dev->name); 958 ifsta->state = IEEE80211_STA_MLME_DISABLED; 959 return; 960 } 961 962 ieee80211_send_assoc(sdata, ifsta); 963 964 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT); 965 } 966 967 968 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata, 969 struct ieee80211_if_sta *ifsta) 970 { 971 struct ieee80211_local *local = sdata->local; 972 struct sta_info *sta; 973 int disassoc; 974 975 /* TODO: start monitoring current AP signal quality and number of 976 * missed beacons. Scan other channels every now and then and search 977 * for better APs. */ 978 /* TODO: remove expired BSSes */ 979 980 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED; 981 982 rcu_read_lock(); 983 984 sta = sta_info_get(local, ifsta->bssid); 985 if (!sta) { 986 printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n", 987 sdata->dev->name, ifsta->bssid); 988 disassoc = 1; 989 } else { 990 disassoc = 0; 991 if (time_after(jiffies, 992 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) { 993 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) { 994 printk(KERN_DEBUG "%s: No ProbeResp from " 995 "current AP %pM - assume out of " 996 "range\n", 997 sdata->dev->name, ifsta->bssid); 998 disassoc = 1; 999 } else 1000 ieee80211_send_probe_req(sdata, ifsta->bssid, 1001 ifsta->ssid, 1002 ifsta->ssid_len); 1003 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL; 1004 } else { 1005 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL; 1006 if (time_after(jiffies, ifsta->last_probe + 1007 IEEE80211_PROBE_INTERVAL)) { 1008 ifsta->last_probe = jiffies; 1009 ieee80211_send_probe_req(sdata, ifsta->bssid, 1010 ifsta->ssid, 1011 ifsta->ssid_len); 1012 } 1013 } 1014 } 1015 1016 rcu_read_unlock(); 1017 1018 if (disassoc) 1019 ieee80211_set_disassoc(sdata, ifsta, true, true, 1020 WLAN_REASON_PREV_AUTH_NOT_VALID); 1021 else 1022 mod_timer(&ifsta->timer, jiffies + 1023 IEEE80211_MONITORING_INTERVAL); 1024 } 1025 1026 1027 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata, 1028 struct ieee80211_if_sta *ifsta) 1029 { 1030 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name); 1031 ifsta->flags |= IEEE80211_STA_AUTHENTICATED; 1032 ieee80211_associate(sdata, ifsta); 1033 } 1034 1035 1036 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 1037 struct ieee80211_if_sta *ifsta, 1038 struct ieee80211_mgmt *mgmt, 1039 size_t len) 1040 { 1041 u8 *pos; 1042 struct ieee802_11_elems elems; 1043 1044 pos = mgmt->u.auth.variable; 1045 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1046 if (!elems.challenge) 1047 return; 1048 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2, 1049 elems.challenge_len + 2, 1); 1050 } 1051 1052 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 1053 struct ieee80211_if_sta *ifsta, 1054 struct ieee80211_mgmt *mgmt, 1055 size_t len) 1056 { 1057 u16 auth_alg, auth_transaction, status_code; 1058 1059 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE && 1060 sdata->vif.type != NL80211_IFTYPE_ADHOC) 1061 return; 1062 1063 if (len < 24 + 6) 1064 return; 1065 1066 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 1067 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) 1068 return; 1069 1070 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 1071 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) 1072 return; 1073 1074 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 1075 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 1076 status_code = le16_to_cpu(mgmt->u.auth.status_code); 1077 1078 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1079 /* 1080 * IEEE 802.11 standard does not require authentication in IBSS 1081 * networks and most implementations do not seem to use it. 1082 * However, try to reply to authentication attempts if someone 1083 * has actually implemented this. 1084 */ 1085 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 1086 return; 1087 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0); 1088 } 1089 1090 if (auth_alg != ifsta->auth_alg || 1091 auth_transaction != ifsta->auth_transaction) 1092 return; 1093 1094 if (status_code != WLAN_STATUS_SUCCESS) { 1095 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) { 1096 u8 algs[3]; 1097 const int num_algs = ARRAY_SIZE(algs); 1098 int i, pos; 1099 algs[0] = algs[1] = algs[2] = 0xff; 1100 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN) 1101 algs[0] = WLAN_AUTH_OPEN; 1102 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) 1103 algs[1] = WLAN_AUTH_SHARED_KEY; 1104 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP) 1105 algs[2] = WLAN_AUTH_LEAP; 1106 if (ifsta->auth_alg == WLAN_AUTH_OPEN) 1107 pos = 0; 1108 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY) 1109 pos = 1; 1110 else 1111 pos = 2; 1112 for (i = 0; i < num_algs; i++) { 1113 pos++; 1114 if (pos >= num_algs) 1115 pos = 0; 1116 if (algs[pos] == ifsta->auth_alg || 1117 algs[pos] == 0xff) 1118 continue; 1119 if (algs[pos] == WLAN_AUTH_SHARED_KEY && 1120 !ieee80211_sta_wep_configured(sdata)) 1121 continue; 1122 ifsta->auth_alg = algs[pos]; 1123 break; 1124 } 1125 } 1126 return; 1127 } 1128 1129 switch (ifsta->auth_alg) { 1130 case WLAN_AUTH_OPEN: 1131 case WLAN_AUTH_LEAP: 1132 ieee80211_auth_completed(sdata, ifsta); 1133 break; 1134 case WLAN_AUTH_SHARED_KEY: 1135 if (ifsta->auth_transaction == 4) 1136 ieee80211_auth_completed(sdata, ifsta); 1137 else 1138 ieee80211_auth_challenge(sdata, ifsta, mgmt, len); 1139 break; 1140 } 1141 } 1142 1143 1144 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1145 struct ieee80211_if_sta *ifsta, 1146 struct ieee80211_mgmt *mgmt, 1147 size_t len) 1148 { 1149 u16 reason_code; 1150 1151 if (len < 24 + 2) 1152 return; 1153 1154 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN)) 1155 return; 1156 1157 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1158 1159 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) 1160 printk(KERN_DEBUG "%s: deauthenticated (Reason: %u)\n", 1161 sdata->dev->name, reason_code); 1162 1163 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE || 1164 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE || 1165 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) { 1166 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; 1167 mod_timer(&ifsta->timer, jiffies + 1168 IEEE80211_RETRY_AUTH_INTERVAL); 1169 } 1170 1171 ieee80211_set_disassoc(sdata, ifsta, true, false, 0); 1172 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED; 1173 } 1174 1175 1176 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1177 struct ieee80211_if_sta *ifsta, 1178 struct ieee80211_mgmt *mgmt, 1179 size_t len) 1180 { 1181 u16 reason_code; 1182 1183 if (len < 24 + 2) 1184 return; 1185 1186 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN)) 1187 return; 1188 1189 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1190 1191 if (ifsta->flags & IEEE80211_STA_ASSOCIATED) 1192 printk(KERN_DEBUG "%s: disassociated (Reason: %u)\n", 1193 sdata->dev->name, reason_code); 1194 1195 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) { 1196 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE; 1197 mod_timer(&ifsta->timer, jiffies + 1198 IEEE80211_RETRY_AUTH_INTERVAL); 1199 } 1200 1201 ieee80211_set_disassoc(sdata, ifsta, false, false, reason_code); 1202 } 1203 1204 1205 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 1206 struct ieee80211_if_sta *ifsta, 1207 struct ieee80211_mgmt *mgmt, 1208 size_t len, 1209 int reassoc) 1210 { 1211 struct ieee80211_local *local = sdata->local; 1212 struct ieee80211_supported_band *sband; 1213 struct sta_info *sta; 1214 u64 rates, basic_rates; 1215 u16 capab_info, status_code, aid; 1216 struct ieee802_11_elems elems; 1217 struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf; 1218 u8 *pos; 1219 u32 changed = 0; 1220 int i, j; 1221 bool have_higher_than_11mbit = false, newsta = false; 1222 u16 ap_ht_cap_flags; 1223 1224 /* AssocResp and ReassocResp have identical structure, so process both 1225 * of them in this function. */ 1226 1227 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE) 1228 return; 1229 1230 if (len < 24 + 6) 1231 return; 1232 1233 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) 1234 return; 1235 1236 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1237 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 1238 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1239 1240 printk(KERN_DEBUG "%s: RX %sssocResp from %pM (capab=0x%x " 1241 "status=%d aid=%d)\n", 1242 sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa, 1243 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 1244 1245 if (status_code != WLAN_STATUS_SUCCESS) { 1246 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n", 1247 sdata->dev->name, status_code); 1248 /* if this was a reassociation, ensure we try a "full" 1249 * association next time. This works around some broken APs 1250 * which do not correctly reject reassociation requests. */ 1251 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET; 1252 return; 1253 } 1254 1255 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1256 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1257 "set\n", sdata->dev->name, aid); 1258 aid &= ~(BIT(15) | BIT(14)); 1259 1260 pos = mgmt->u.assoc_resp.variable; 1261 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1262 1263 if (!elems.supp_rates) { 1264 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1265 sdata->dev->name); 1266 return; 1267 } 1268 1269 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name); 1270 ifsta->aid = aid; 1271 ifsta->ap_capab = capab_info; 1272 1273 kfree(ifsta->assocresp_ies); 1274 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt); 1275 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL); 1276 if (ifsta->assocresp_ies) 1277 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len); 1278 1279 rcu_read_lock(); 1280 1281 /* Add STA entry for the AP */ 1282 sta = sta_info_get(local, ifsta->bssid); 1283 if (!sta) { 1284 struct ieee80211_bss *bss; 1285 1286 newsta = true; 1287 1288 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC); 1289 if (!sta) { 1290 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1291 " the AP\n", sdata->dev->name); 1292 rcu_read_unlock(); 1293 return; 1294 } 1295 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 1296 local->hw.conf.channel->center_freq, 1297 ifsta->ssid, ifsta->ssid_len); 1298 if (bss) { 1299 sta->last_signal = bss->signal; 1300 sta->last_qual = bss->qual; 1301 sta->last_noise = bss->noise; 1302 ieee80211_rx_bss_put(local, bss); 1303 } 1304 1305 /* update new sta with its last rx activity */ 1306 sta->last_rx = jiffies; 1307 } 1308 1309 /* 1310 * FIXME: Do we really need to update the sta_info's information here? 1311 * We already know about the AP (we found it in our list) so it 1312 * should already be filled with the right info, no? 1313 * As is stands, all this is racy because typically we assume 1314 * the information that is filled in here (except flags) doesn't 1315 * change while a STA structure is alive. As such, it should move 1316 * to between the sta_info_alloc() and sta_info_insert() above. 1317 */ 1318 1319 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP | 1320 WLAN_STA_AUTHORIZED); 1321 1322 rates = 0; 1323 basic_rates = 0; 1324 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1325 1326 for (i = 0; i < elems.supp_rates_len; i++) { 1327 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1328 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1329 1330 if (rate > 110) 1331 have_higher_than_11mbit = true; 1332 1333 for (j = 0; j < sband->n_bitrates; j++) { 1334 if (sband->bitrates[j].bitrate == rate) { 1335 rates |= BIT(j); 1336 if (is_basic) 1337 basic_rates |= BIT(j); 1338 break; 1339 } 1340 } 1341 } 1342 1343 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1344 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1345 bool is_basic = !!(elems.supp_rates[i] & 0x80); 1346 1347 if (rate > 110) 1348 have_higher_than_11mbit = true; 1349 1350 for (j = 0; j < sband->n_bitrates; j++) { 1351 if (sband->bitrates[j].bitrate == rate) { 1352 rates |= BIT(j); 1353 if (is_basic) 1354 basic_rates |= BIT(j); 1355 break; 1356 } 1357 } 1358 } 1359 1360 sta->sta.supp_rates[local->hw.conf.channel->band] = rates; 1361 sdata->vif.bss_conf.basic_rates = basic_rates; 1362 1363 /* cf. IEEE 802.11 9.2.12 */ 1364 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && 1365 have_higher_than_11mbit) 1366 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1367 else 1368 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1369 1370 if (elems.ht_cap_elem) 1371 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1372 elems.ht_cap_elem, &sta->sta.ht_cap); 1373 1374 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1375 1376 rate_control_rate_init(sta); 1377 1378 if (elems.wmm_param) 1379 set_sta_flags(sta, WLAN_STA_WME); 1380 1381 if (newsta) { 1382 int err = sta_info_insert(sta); 1383 if (err) { 1384 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1385 " the AP (error %d)\n", sdata->dev->name, err); 1386 rcu_read_unlock(); 1387 return; 1388 } 1389 } 1390 1391 rcu_read_unlock(); 1392 1393 if (elems.wmm_param) 1394 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param, 1395 elems.wmm_param_len); 1396 1397 if (elems.ht_info_elem && elems.wmm_param && 1398 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) 1399 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1400 ap_ht_cap_flags); 1401 1402 /* set AID and assoc capability, 1403 * ieee80211_set_associated() will tell the driver */ 1404 bss_conf->aid = aid; 1405 bss_conf->assoc_capability = capab_info; 1406 ieee80211_set_associated(sdata, ifsta, changed); 1407 1408 ieee80211_associated(sdata, ifsta); 1409 } 1410 1411 1412 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 1413 struct ieee80211_if_sta *ifsta, 1414 struct ieee80211_bss *bss) 1415 { 1416 struct ieee80211_local *local = sdata->local; 1417 int res, rates, i, j; 1418 struct sk_buff *skb; 1419 struct ieee80211_mgmt *mgmt; 1420 u8 *pos; 1421 struct ieee80211_supported_band *sband; 1422 union iwreq_data wrqu; 1423 1424 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); 1425 if (!skb) { 1426 printk(KERN_DEBUG "%s: failed to allocate buffer for probe " 1427 "response\n", sdata->dev->name); 1428 return -ENOMEM; 1429 } 1430 1431 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1432 1433 /* Remove possible STA entries from other IBSS networks. */ 1434 sta_info_flush_delayed(sdata); 1435 1436 if (local->ops->reset_tsf) { 1437 /* Reset own TSF to allow time synchronization work. */ 1438 local->ops->reset_tsf(local_to_hw(local)); 1439 } 1440 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN); 1441 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); 1442 if (res) 1443 return res; 1444 1445 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10; 1446 1447 sdata->drop_unencrypted = bss->capability & 1448 WLAN_CAPABILITY_PRIVACY ? 1 : 0; 1449 1450 res = ieee80211_set_freq(sdata, bss->freq); 1451 1452 if (res) 1453 return res; 1454 1455 /* Build IBSS probe response */ 1456 1457 skb_reserve(skb, local->hw.extra_tx_headroom); 1458 1459 mgmt = (struct ieee80211_mgmt *) 1460 skb_put(skb, 24 + sizeof(mgmt->u.beacon)); 1461 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); 1462 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1463 IEEE80211_STYPE_PROBE_RESP); 1464 memset(mgmt->da, 0xff, ETH_ALEN); 1465 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 1466 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 1467 mgmt->u.beacon.beacon_int = 1468 cpu_to_le16(local->hw.conf.beacon_int); 1469 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp); 1470 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability); 1471 1472 pos = skb_put(skb, 2 + ifsta->ssid_len); 1473 *pos++ = WLAN_EID_SSID; 1474 *pos++ = ifsta->ssid_len; 1475 memcpy(pos, ifsta->ssid, ifsta->ssid_len); 1476 1477 rates = bss->supp_rates_len; 1478 if (rates > 8) 1479 rates = 8; 1480 pos = skb_put(skb, 2 + rates); 1481 *pos++ = WLAN_EID_SUPP_RATES; 1482 *pos++ = rates; 1483 memcpy(pos, bss->supp_rates, rates); 1484 1485 if (bss->band == IEEE80211_BAND_2GHZ) { 1486 pos = skb_put(skb, 2 + 1); 1487 *pos++ = WLAN_EID_DS_PARAMS; 1488 *pos++ = 1; 1489 *pos++ = ieee80211_frequency_to_channel(bss->freq); 1490 } 1491 1492 pos = skb_put(skb, 2 + 2); 1493 *pos++ = WLAN_EID_IBSS_PARAMS; 1494 *pos++ = 2; 1495 /* FIX: set ATIM window based on scan results */ 1496 *pos++ = 0; 1497 *pos++ = 0; 1498 1499 if (bss->supp_rates_len > 8) { 1500 rates = bss->supp_rates_len - 8; 1501 pos = skb_put(skb, 2 + rates); 1502 *pos++ = WLAN_EID_EXT_SUPP_RATES; 1503 *pos++ = rates; 1504 memcpy(pos, &bss->supp_rates[8], rates); 1505 } 1506 1507 ifsta->probe_resp = skb; 1508 1509 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON); 1510 1511 1512 rates = 0; 1513 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1514 for (i = 0; i < bss->supp_rates_len; i++) { 1515 int bitrate = (bss->supp_rates[i] & 0x7f) * 5; 1516 for (j = 0; j < sband->n_bitrates; j++) 1517 if (sband->bitrates[j].bitrate == bitrate) 1518 rates |= BIT(j); 1519 } 1520 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates; 1521 1522 ieee80211_sta_def_wmm_params(sdata, bss); 1523 1524 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED; 1525 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL); 1526 1527 ieee80211_led_assoc(local, true); 1528 1529 memset(&wrqu, 0, sizeof(wrqu)); 1530 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN); 1531 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL); 1532 1533 return res; 1534 } 1535 1536 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1537 struct ieee80211_mgmt *mgmt, 1538 size_t len, 1539 struct ieee80211_rx_status *rx_status, 1540 struct ieee802_11_elems *elems, 1541 bool beacon) 1542 { 1543 struct ieee80211_local *local = sdata->local; 1544 int freq; 1545 struct ieee80211_bss *bss; 1546 struct sta_info *sta; 1547 struct ieee80211_channel *channel; 1548 u64 beacon_timestamp, rx_timestamp; 1549 u64 supp_rates = 0; 1550 enum ieee80211_band band = rx_status->band; 1551 1552 if (elems->ds_params && elems->ds_params_len == 1) 1553 freq = ieee80211_channel_to_frequency(elems->ds_params[0]); 1554 else 1555 freq = rx_status->freq; 1556 1557 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1558 1559 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1560 return; 1561 1562 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && 1563 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) { 1564 supp_rates = ieee80211_sta_get_rates(local, elems, band); 1565 1566 rcu_read_lock(); 1567 1568 sta = sta_info_get(local, mgmt->sa); 1569 if (sta) { 1570 u64 prev_rates; 1571 1572 prev_rates = sta->sta.supp_rates[band]; 1573 /* make sure mandatory rates are always added */ 1574 sta->sta.supp_rates[band] = supp_rates | 1575 ieee80211_mandatory_rates(local, band); 1576 1577 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1578 if (sta->sta.supp_rates[band] != prev_rates) 1579 printk(KERN_DEBUG "%s: updated supp_rates set " 1580 "for %pM based on beacon info (0x%llx | " 1581 "0x%llx -> 0x%llx)\n", 1582 sdata->dev->name, 1583 sta->sta.addr, 1584 (unsigned long long) prev_rates, 1585 (unsigned long long) supp_rates, 1586 (unsigned long long) sta->sta.supp_rates[band]); 1587 #endif 1588 } else { 1589 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); 1590 } 1591 1592 rcu_read_unlock(); 1593 } 1594 1595 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1596 freq, beacon); 1597 if (!bss) 1598 return; 1599 1600 /* was just updated in ieee80211_bss_info_update */ 1601 beacon_timestamp = bss->timestamp; 1602 1603 /* 1604 * In STA mode, the remaining parameters should not be overridden 1605 * by beacons because they're not necessarily accurate there. 1606 */ 1607 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 1608 bss->last_probe_resp && beacon) { 1609 ieee80211_rx_bss_put(local, bss); 1610 return; 1611 } 1612 1613 /* check if we need to merge IBSS */ 1614 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon && 1615 bss->capability & WLAN_CAPABILITY_IBSS && 1616 bss->freq == local->oper_channel->center_freq && 1617 elems->ssid_len == sdata->u.sta.ssid_len && 1618 memcmp(elems->ssid, sdata->u.sta.ssid, 1619 sdata->u.sta.ssid_len) == 0) { 1620 if (rx_status->flag & RX_FLAG_TSFT) { 1621 /* in order for correct IBSS merging we need mactime 1622 * 1623 * since mactime is defined as the time the first data 1624 * symbol of the frame hits the PHY, and the timestamp 1625 * of the beacon is defined as "the time that the data 1626 * symbol containing the first bit of the timestamp is 1627 * transmitted to the PHY plus the transmitting STA’s 1628 * delays through its local PHY from the MAC-PHY 1629 * interface to its interface with the WM" 1630 * (802.11 11.1.2) - equals the time this bit arrives at 1631 * the receiver - we have to take into account the 1632 * offset between the two. 1633 * e.g: at 1 MBit that means mactime is 192 usec earlier 1634 * (=24 bytes * 8 usecs/byte) than the beacon timestamp. 1635 */ 1636 int rate; 1637 if (rx_status->flag & RX_FLAG_HT) { 1638 rate = 65; /* TODO: HT rates */ 1639 } else { 1640 rate = local->hw.wiphy->bands[band]-> 1641 bitrates[rx_status->rate_idx].bitrate; 1642 } 1643 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); 1644 } else if (local && local->ops && local->ops->get_tsf) 1645 /* second best option: get current TSF */ 1646 rx_timestamp = local->ops->get_tsf(local_to_hw(local)); 1647 else 1648 /* can't merge without knowing the TSF */ 1649 rx_timestamp = -1LLU; 1650 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1651 printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" 1652 "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 1653 mgmt->sa, mgmt->bssid, 1654 (unsigned long long)rx_timestamp, 1655 (unsigned long long)beacon_timestamp, 1656 (unsigned long long)(rx_timestamp - beacon_timestamp), 1657 jiffies); 1658 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 1659 if (beacon_timestamp > rx_timestamp) { 1660 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1661 printk(KERN_DEBUG "%s: beacon TSF higher than " 1662 "local TSF - IBSS merge with BSSID %pM\n", 1663 sdata->dev->name, mgmt->bssid); 1664 #endif 1665 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss); 1666 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); 1667 } 1668 } 1669 1670 ieee80211_rx_bss_put(local, bss); 1671 } 1672 1673 1674 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1675 struct ieee80211_mgmt *mgmt, 1676 size_t len, 1677 struct ieee80211_rx_status *rx_status) 1678 { 1679 size_t baselen; 1680 struct ieee802_11_elems elems; 1681 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 1682 1683 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) 1684 return; /* ignore ProbeResp to foreign address */ 1685 1686 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1687 if (baselen > len) 1688 return; 1689 1690 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1691 &elems); 1692 1693 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1694 1695 /* direct probe may be part of the association flow */ 1696 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE, 1697 &ifsta->request)) { 1698 printk(KERN_DEBUG "%s direct probe responded\n", 1699 sdata->dev->name); 1700 ieee80211_authenticate(sdata, ifsta); 1701 } 1702 } 1703 1704 1705 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1706 struct ieee80211_mgmt *mgmt, 1707 size_t len, 1708 struct ieee80211_rx_status *rx_status) 1709 { 1710 struct ieee80211_if_sta *ifsta; 1711 size_t baselen; 1712 struct ieee802_11_elems elems; 1713 struct ieee80211_local *local = sdata->local; 1714 u32 changed = 0; 1715 bool erp_valid; 1716 u8 erp_value = 0; 1717 1718 /* Process beacon from the current BSS */ 1719 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1720 if (baselen > len) 1721 return; 1722 1723 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); 1724 1725 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); 1726 1727 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1728 return; 1729 ifsta = &sdata->u.sta; 1730 1731 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) || 1732 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) 1733 return; 1734 1735 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param, 1736 elems.wmm_param_len); 1737 1738 1739 if (elems.erp_info && elems.erp_info_len >= 1) { 1740 erp_valid = true; 1741 erp_value = elems.erp_info[0]; 1742 } else { 1743 erp_valid = false; 1744 } 1745 changed |= ieee80211_handle_bss_capability(sdata, 1746 le16_to_cpu(mgmt->u.beacon.capab_info), 1747 erp_valid, erp_value); 1748 1749 1750 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param) { 1751 struct sta_info *sta; 1752 struct ieee80211_supported_band *sband; 1753 u16 ap_ht_cap_flags; 1754 1755 rcu_read_lock(); 1756 1757 sta = sta_info_get(local, ifsta->bssid); 1758 if (!sta) { 1759 rcu_read_unlock(); 1760 return; 1761 } 1762 1763 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1764 1765 ieee80211_ht_cap_ie_to_sta_ht_cap(sband, 1766 elems.ht_cap_elem, &sta->sta.ht_cap); 1767 1768 ap_ht_cap_flags = sta->sta.ht_cap.cap; 1769 1770 rcu_read_unlock(); 1771 1772 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem, 1773 ap_ht_cap_flags); 1774 } 1775 1776 if (elems.country_elem) { 1777 /* Note we are only reviewing this on beacons 1778 * for the BSSID we are associated to */ 1779 regulatory_hint_11d(local->hw.wiphy, 1780 elems.country_elem, elems.country_elem_len); 1781 } 1782 1783 ieee80211_bss_info_change_notify(sdata, changed); 1784 } 1785 1786 1787 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1788 struct ieee80211_if_sta *ifsta, 1789 struct ieee80211_mgmt *mgmt, 1790 size_t len, 1791 struct ieee80211_rx_status *rx_status) 1792 { 1793 struct ieee80211_local *local = sdata->local; 1794 int tx_last_beacon; 1795 struct sk_buff *skb; 1796 struct ieee80211_mgmt *resp; 1797 u8 *pos, *end; 1798 1799 if (sdata->vif.type != NL80211_IFTYPE_ADHOC || 1800 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED || 1801 len < 24 + 2 || !ifsta->probe_resp) 1802 return; 1803 1804 if (local->ops->tx_last_beacon) 1805 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local)); 1806 else 1807 tx_last_beacon = 1; 1808 1809 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1810 printk(KERN_DEBUG "%s: RX ProbeReq SA=%pM DA=%pM BSSID=%pM" 1811 " (tx_last_beacon=%d)\n", 1812 sdata->dev->name, mgmt->sa, mgmt->da, 1813 mgmt->bssid, tx_last_beacon); 1814 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 1815 1816 if (!tx_last_beacon) 1817 return; 1818 1819 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 && 1820 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) 1821 return; 1822 1823 end = ((u8 *) mgmt) + len; 1824 pos = mgmt->u.probe_req.variable; 1825 if (pos[0] != WLAN_EID_SSID || 1826 pos + 2 + pos[1] > end) { 1827 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1828 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " 1829 "from %pM\n", 1830 sdata->dev->name, mgmt->sa); 1831 #endif 1832 return; 1833 } 1834 if (pos[1] != 0 && 1835 (pos[1] != ifsta->ssid_len || 1836 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) { 1837 /* Ignore ProbeReq for foreign SSID */ 1838 return; 1839 } 1840 1841 /* Reply with ProbeResp */ 1842 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL); 1843 if (!skb) 1844 return; 1845 1846 resp = (struct ieee80211_mgmt *) skb->data; 1847 memcpy(resp->da, mgmt->sa, ETH_ALEN); 1848 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1849 printk(KERN_DEBUG "%s: Sending ProbeResp to %pM\n", 1850 sdata->dev->name, resp->da); 1851 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 1852 ieee80211_tx_skb(sdata, skb, 0); 1853 } 1854 1855 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1856 struct ieee80211_rx_status *rx_status) 1857 { 1858 struct ieee80211_local *local = sdata->local; 1859 struct ieee80211_if_sta *ifsta; 1860 struct ieee80211_mgmt *mgmt; 1861 u16 fc; 1862 1863 if (skb->len < 24) 1864 goto fail; 1865 1866 ifsta = &sdata->u.sta; 1867 1868 mgmt = (struct ieee80211_mgmt *) skb->data; 1869 fc = le16_to_cpu(mgmt->frame_control); 1870 1871 switch (fc & IEEE80211_FCTL_STYPE) { 1872 case IEEE80211_STYPE_PROBE_REQ: 1873 case IEEE80211_STYPE_PROBE_RESP: 1874 case IEEE80211_STYPE_BEACON: 1875 memcpy(skb->cb, rx_status, sizeof(*rx_status)); 1876 case IEEE80211_STYPE_AUTH: 1877 case IEEE80211_STYPE_ASSOC_RESP: 1878 case IEEE80211_STYPE_REASSOC_RESP: 1879 case IEEE80211_STYPE_DEAUTH: 1880 case IEEE80211_STYPE_DISASSOC: 1881 skb_queue_tail(&ifsta->skb_queue, skb); 1882 queue_work(local->hw.workqueue, &ifsta->work); 1883 return; 1884 } 1885 1886 fail: 1887 kfree_skb(skb); 1888 } 1889 1890 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1891 struct sk_buff *skb) 1892 { 1893 struct ieee80211_rx_status *rx_status; 1894 struct ieee80211_if_sta *ifsta; 1895 struct ieee80211_mgmt *mgmt; 1896 u16 fc; 1897 1898 ifsta = &sdata->u.sta; 1899 1900 rx_status = (struct ieee80211_rx_status *) skb->cb; 1901 mgmt = (struct ieee80211_mgmt *) skb->data; 1902 fc = le16_to_cpu(mgmt->frame_control); 1903 1904 switch (fc & IEEE80211_FCTL_STYPE) { 1905 case IEEE80211_STYPE_PROBE_REQ: 1906 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len, 1907 rx_status); 1908 break; 1909 case IEEE80211_STYPE_PROBE_RESP: 1910 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status); 1911 break; 1912 case IEEE80211_STYPE_BEACON: 1913 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 1914 break; 1915 case IEEE80211_STYPE_AUTH: 1916 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len); 1917 break; 1918 case IEEE80211_STYPE_ASSOC_RESP: 1919 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0); 1920 break; 1921 case IEEE80211_STYPE_REASSOC_RESP: 1922 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1); 1923 break; 1924 case IEEE80211_STYPE_DEAUTH: 1925 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len); 1926 break; 1927 case IEEE80211_STYPE_DISASSOC: 1928 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len); 1929 break; 1930 } 1931 1932 kfree_skb(skb); 1933 } 1934 1935 1936 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 1937 { 1938 struct ieee80211_local *local = sdata->local; 1939 int active = 0; 1940 struct sta_info *sta; 1941 1942 rcu_read_lock(); 1943 1944 list_for_each_entry_rcu(sta, &local->sta_list, list) { 1945 if (sta->sdata == sdata && 1946 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, 1947 jiffies)) { 1948 active++; 1949 break; 1950 } 1951 } 1952 1953 rcu_read_unlock(); 1954 1955 return active; 1956 } 1957 1958 1959 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata, 1960 struct ieee80211_if_sta *ifsta) 1961 { 1962 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL); 1963 1964 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); 1965 if (ieee80211_sta_active_ibss(sdata)) 1966 return; 1967 1968 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " 1969 "IBSS networks with same SSID (merge)\n", sdata->dev->name); 1970 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len); 1971 } 1972 1973 1974 static void ieee80211_sta_timer(unsigned long data) 1975 { 1976 struct ieee80211_sub_if_data *sdata = 1977 (struct ieee80211_sub_if_data *) data; 1978 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 1979 struct ieee80211_local *local = sdata->local; 1980 1981 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request); 1982 queue_work(local->hw.workqueue, &ifsta->work); 1983 } 1984 1985 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata, 1986 struct ieee80211_if_sta *ifsta) 1987 { 1988 struct ieee80211_local *local = sdata->local; 1989 1990 if (local->ops->reset_tsf) { 1991 /* Reset own TSF to allow time synchronization work. */ 1992 local->ops->reset_tsf(local_to_hw(local)); 1993 } 1994 1995 ifsta->wmm_last_param_set = -1; /* allow any WMM update */ 1996 1997 1998 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN) 1999 ifsta->auth_alg = WLAN_AUTH_OPEN; 2000 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) 2001 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY; 2002 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP) 2003 ifsta->auth_alg = WLAN_AUTH_LEAP; 2004 else 2005 ifsta->auth_alg = WLAN_AUTH_OPEN; 2006 ifsta->auth_transaction = -1; 2007 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED; 2008 ifsta->assoc_scan_tries = 0; 2009 ifsta->direct_probe_tries = 0; 2010 ifsta->auth_tries = 0; 2011 ifsta->assoc_tries = 0; 2012 netif_tx_stop_all_queues(sdata->dev); 2013 netif_carrier_off(sdata->dev); 2014 } 2015 2016 2017 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta, 2018 const char *ssid, int ssid_len) 2019 { 2020 int tmp, hidden_ssid; 2021 2022 if (ssid_len == ifsta->ssid_len && 2023 !memcmp(ifsta->ssid, ssid, ssid_len)) 2024 return 1; 2025 2026 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) 2027 return 0; 2028 2029 hidden_ssid = 1; 2030 tmp = ssid_len; 2031 while (tmp--) { 2032 if (ssid[tmp] != '\0') { 2033 hidden_ssid = 0; 2034 break; 2035 } 2036 } 2037 2038 if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0)) 2039 return 1; 2040 2041 if (ssid_len == 1 && ssid[0] == ' ') 2042 return 1; 2043 2044 return 0; 2045 } 2046 2047 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata, 2048 struct ieee80211_if_sta *ifsta) 2049 { 2050 struct ieee80211_local *local = sdata->local; 2051 struct ieee80211_bss *bss; 2052 struct ieee80211_supported_band *sband; 2053 u8 bssid[ETH_ALEN], *pos; 2054 int i; 2055 int ret; 2056 2057 #if 0 2058 /* Easier testing, use fixed BSSID. */ 2059 memset(bssid, 0xfe, ETH_ALEN); 2060 #else 2061 /* Generate random, not broadcast, locally administered BSSID. Mix in 2062 * own MAC address to make sure that devices that do not have proper 2063 * random number generator get different BSSID. */ 2064 get_random_bytes(bssid, ETH_ALEN); 2065 for (i = 0; i < ETH_ALEN; i++) 2066 bssid[i] ^= sdata->dev->dev_addr[i]; 2067 bssid[0] &= ~0x01; 2068 bssid[0] |= 0x02; 2069 #endif 2070 2071 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n", 2072 sdata->dev->name, bssid); 2073 2074 bss = ieee80211_rx_bss_add(local, bssid, 2075 local->hw.conf.channel->center_freq, 2076 sdata->u.sta.ssid, sdata->u.sta.ssid_len); 2077 if (!bss) 2078 return -ENOMEM; 2079 2080 bss->band = local->hw.conf.channel->band; 2081 sband = local->hw.wiphy->bands[bss->band]; 2082 2083 if (local->hw.conf.beacon_int == 0) 2084 local->hw.conf.beacon_int = 100; 2085 bss->beacon_int = local->hw.conf.beacon_int; 2086 bss->last_update = jiffies; 2087 bss->capability = WLAN_CAPABILITY_IBSS; 2088 2089 if (sdata->default_key) 2090 bss->capability |= WLAN_CAPABILITY_PRIVACY; 2091 else 2092 sdata->drop_unencrypted = 0; 2093 2094 bss->supp_rates_len = sband->n_bitrates; 2095 pos = bss->supp_rates; 2096 for (i = 0; i < sband->n_bitrates; i++) { 2097 int rate = sband->bitrates[i].bitrate; 2098 *pos++ = (u8) (rate / 5); 2099 } 2100 2101 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss); 2102 ieee80211_rx_bss_put(local, bss); 2103 return ret; 2104 } 2105 2106 2107 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata, 2108 struct ieee80211_if_sta *ifsta) 2109 { 2110 struct ieee80211_local *local = sdata->local; 2111 struct ieee80211_bss *bss; 2112 int found = 0; 2113 u8 bssid[ETH_ALEN]; 2114 int active_ibss; 2115 2116 if (ifsta->ssid_len == 0) 2117 return -EINVAL; 2118 2119 active_ibss = ieee80211_sta_active_ibss(sdata); 2120 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2121 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", 2122 sdata->dev->name, active_ibss); 2123 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2124 spin_lock_bh(&local->bss_lock); 2125 list_for_each_entry(bss, &local->bss_list, list) { 2126 if (ifsta->ssid_len != bss->ssid_len || 2127 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0 2128 || !(bss->capability & WLAN_CAPABILITY_IBSS)) 2129 continue; 2130 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2131 printk(KERN_DEBUG " bssid=%pM found\n", bss->bssid); 2132 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2133 memcpy(bssid, bss->bssid, ETH_ALEN); 2134 found = 1; 2135 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0) 2136 break; 2137 } 2138 spin_unlock_bh(&local->bss_lock); 2139 2140 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2141 if (found) 2142 printk(KERN_DEBUG " sta_find_ibss: selected %pM current " 2143 "%pM\n", bssid, ifsta->bssid); 2144 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2145 2146 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) { 2147 int ret; 2148 int search_freq; 2149 2150 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) 2151 search_freq = bss->freq; 2152 else 2153 search_freq = local->hw.conf.channel->center_freq; 2154 2155 bss = ieee80211_rx_bss_get(local, bssid, search_freq, 2156 ifsta->ssid, ifsta->ssid_len); 2157 if (!bss) 2158 goto dont_join; 2159 2160 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM" 2161 " based on configured SSID\n", 2162 sdata->dev->name, bssid); 2163 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss); 2164 ieee80211_rx_bss_put(local, bss); 2165 return ret; 2166 } 2167 2168 dont_join: 2169 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2170 printk(KERN_DEBUG " did not try to join ibss\n"); 2171 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2172 2173 /* Selected IBSS not found in current scan results - try to scan */ 2174 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED && 2175 !ieee80211_sta_active_ibss(sdata)) { 2176 mod_timer(&ifsta->timer, jiffies + 2177 IEEE80211_IBSS_MERGE_INTERVAL); 2178 } else if (time_after(jiffies, local->last_scan_completed + 2179 IEEE80211_SCAN_INTERVAL)) { 2180 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " 2181 "join\n", sdata->dev->name); 2182 return ieee80211_request_scan(sdata, ifsta->ssid, 2183 ifsta->ssid_len); 2184 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) { 2185 int interval = IEEE80211_SCAN_INTERVAL; 2186 2187 if (time_after(jiffies, ifsta->ibss_join_req + 2188 IEEE80211_IBSS_JOIN_TIMEOUT)) { 2189 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) && 2190 (!(local->oper_channel->flags & 2191 IEEE80211_CHAN_NO_IBSS))) 2192 return ieee80211_sta_create_ibss(sdata, ifsta); 2193 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) { 2194 printk(KERN_DEBUG "%s: IBSS not allowed on" 2195 " %d MHz\n", sdata->dev->name, 2196 local->hw.conf.channel->center_freq); 2197 } 2198 2199 /* No IBSS found - decrease scan interval and continue 2200 * scanning. */ 2201 interval = IEEE80211_SCAN_INTERVAL_SLOW; 2202 } 2203 2204 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH; 2205 mod_timer(&ifsta->timer, jiffies + interval); 2206 return 0; 2207 } 2208 2209 return 0; 2210 } 2211 2212 2213 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata, 2214 struct ieee80211_if_sta *ifsta) 2215 { 2216 struct ieee80211_local *local = sdata->local; 2217 struct ieee80211_bss *bss, *selected = NULL; 2218 int top_rssi = 0, freq; 2219 2220 spin_lock_bh(&local->bss_lock); 2221 freq = local->oper_channel->center_freq; 2222 list_for_each_entry(bss, &local->bss_list, list) { 2223 if (!(bss->capability & WLAN_CAPABILITY_ESS)) 2224 continue; 2225 2226 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL | 2227 IEEE80211_STA_AUTO_BSSID_SEL | 2228 IEEE80211_STA_AUTO_CHANNEL_SEL)) && 2229 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^ 2230 !!sdata->default_key)) 2231 continue; 2232 2233 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) && 2234 bss->freq != freq) 2235 continue; 2236 2237 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) && 2238 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN)) 2239 continue; 2240 2241 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) && 2242 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len)) 2243 continue; 2244 2245 if (!selected || top_rssi < bss->signal) { 2246 selected = bss; 2247 top_rssi = bss->signal; 2248 } 2249 } 2250 if (selected) 2251 atomic_inc(&selected->users); 2252 spin_unlock_bh(&local->bss_lock); 2253 2254 if (selected) { 2255 ieee80211_set_freq(sdata, selected->freq); 2256 if (!(ifsta->flags & IEEE80211_STA_SSID_SET)) 2257 ieee80211_sta_set_ssid(sdata, selected->ssid, 2258 selected->ssid_len); 2259 ieee80211_sta_set_bssid(sdata, selected->bssid); 2260 ieee80211_sta_def_wmm_params(sdata, selected); 2261 2262 /* Send out direct probe if no probe resp was received or 2263 * the one we have is outdated 2264 */ 2265 if (!selected->last_probe_resp || 2266 time_after(jiffies, selected->last_probe_resp 2267 + IEEE80211_SCAN_RESULT_EXPIRE)) 2268 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; 2269 else 2270 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; 2271 2272 ieee80211_rx_bss_put(local, selected); 2273 ieee80211_sta_reset_auth(sdata, ifsta); 2274 return 0; 2275 } else { 2276 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) { 2277 ifsta->assoc_scan_tries++; 2278 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) 2279 ieee80211_start_scan(sdata, NULL, 0); 2280 else 2281 ieee80211_start_scan(sdata, ifsta->ssid, 2282 ifsta->ssid_len); 2283 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; 2284 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request); 2285 } else 2286 ifsta->state = IEEE80211_STA_MLME_DISABLED; 2287 } 2288 return -1; 2289 } 2290 2291 2292 static void ieee80211_sta_work(struct work_struct *work) 2293 { 2294 struct ieee80211_sub_if_data *sdata = 2295 container_of(work, struct ieee80211_sub_if_data, u.sta.work); 2296 struct ieee80211_local *local = sdata->local; 2297 struct ieee80211_if_sta *ifsta; 2298 struct sk_buff *skb; 2299 2300 if (!netif_running(sdata->dev)) 2301 return; 2302 2303 if (local->sw_scanning || local->hw_scanning) 2304 return; 2305 2306 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION && 2307 sdata->vif.type != NL80211_IFTYPE_ADHOC)) 2308 return; 2309 ifsta = &sdata->u.sta; 2310 2311 while ((skb = skb_dequeue(&ifsta->skb_queue))) 2312 ieee80211_sta_rx_queued_mgmt(sdata, skb); 2313 2314 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE && 2315 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE && 2316 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE && 2317 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) { 2318 ieee80211_start_scan(sdata, ifsta->scan_ssid, 2319 ifsta->scan_ssid_len); 2320 return; 2321 } 2322 2323 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) { 2324 if (ieee80211_sta_config_auth(sdata, ifsta)) 2325 return; 2326 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request); 2327 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request)) 2328 return; 2329 2330 switch (ifsta->state) { 2331 case IEEE80211_STA_MLME_DISABLED: 2332 break; 2333 case IEEE80211_STA_MLME_DIRECT_PROBE: 2334 ieee80211_direct_probe(sdata, ifsta); 2335 break; 2336 case IEEE80211_STA_MLME_AUTHENTICATE: 2337 ieee80211_authenticate(sdata, ifsta); 2338 break; 2339 case IEEE80211_STA_MLME_ASSOCIATE: 2340 ieee80211_associate(sdata, ifsta); 2341 break; 2342 case IEEE80211_STA_MLME_ASSOCIATED: 2343 ieee80211_associated(sdata, ifsta); 2344 break; 2345 case IEEE80211_STA_MLME_IBSS_SEARCH: 2346 ieee80211_sta_find_ibss(sdata, ifsta); 2347 break; 2348 case IEEE80211_STA_MLME_IBSS_JOINED: 2349 ieee80211_sta_merge_ibss(sdata, ifsta); 2350 break; 2351 default: 2352 WARN_ON(1); 2353 break; 2354 } 2355 2356 if (ieee80211_privacy_mismatch(sdata, ifsta)) { 2357 printk(KERN_DEBUG "%s: privacy configuration mismatch and " 2358 "mixed-cell disabled - disassociate\n", sdata->dev->name); 2359 2360 ieee80211_set_disassoc(sdata, ifsta, false, true, 2361 WLAN_REASON_UNSPECIFIED); 2362 } 2363 } 2364 2365 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2366 { 2367 if (sdata->vif.type == NL80211_IFTYPE_STATION) 2368 queue_work(sdata->local->hw.workqueue, 2369 &sdata->u.sta.work); 2370 } 2371 2372 /* interface setup */ 2373 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2374 { 2375 struct ieee80211_if_sta *ifsta; 2376 2377 ifsta = &sdata->u.sta; 2378 INIT_WORK(&ifsta->work, ieee80211_sta_work); 2379 setup_timer(&ifsta->timer, ieee80211_sta_timer, 2380 (unsigned long) sdata); 2381 skb_queue_head_init(&ifsta->skb_queue); 2382 2383 ifsta->capab = WLAN_CAPABILITY_ESS; 2384 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN | 2385 IEEE80211_AUTH_ALG_SHARED_KEY; 2386 ifsta->flags |= IEEE80211_STA_CREATE_IBSS | 2387 IEEE80211_STA_AUTO_BSSID_SEL | 2388 IEEE80211_STA_AUTO_CHANNEL_SEL; 2389 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4) 2390 ifsta->flags |= IEEE80211_STA_WMM_ENABLED; 2391 } 2392 2393 /* 2394 * Add a new IBSS station, will also be called by the RX code when, 2395 * in IBSS mode, receiving a frame from a yet-unknown station, hence 2396 * must be callable in atomic context. 2397 */ 2398 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, 2399 u8 *bssid,u8 *addr, u64 supp_rates) 2400 { 2401 struct ieee80211_local *local = sdata->local; 2402 struct sta_info *sta; 2403 int band = local->hw.conf.channel->band; 2404 2405 /* TODO: Could consider removing the least recently used entry and 2406 * allow new one to be added. */ 2407 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 2408 if (net_ratelimit()) { 2409 printk(KERN_DEBUG "%s: No room for a new IBSS STA " 2410 "entry %pM\n", sdata->dev->name, addr); 2411 } 2412 return NULL; 2413 } 2414 2415 if (compare_ether_addr(bssid, sdata->u.sta.bssid)) 2416 return NULL; 2417 2418 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2419 printk(KERN_DEBUG "%s: Adding new IBSS station %pM (dev=%s)\n", 2420 wiphy_name(local->hw.wiphy), addr, sdata->dev->name); 2421 #endif 2422 2423 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 2424 if (!sta) 2425 return NULL; 2426 2427 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 2428 2429 /* make sure mandatory rates are always added */ 2430 sta->sta.supp_rates[band] = supp_rates | 2431 ieee80211_mandatory_rates(local, band); 2432 2433 rate_control_rate_init(sta); 2434 2435 if (sta_info_insert(sta)) 2436 return NULL; 2437 2438 return sta; 2439 } 2440 2441 /* configuration hooks */ 2442 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata, 2443 struct ieee80211_if_sta *ifsta) 2444 { 2445 struct ieee80211_local *local = sdata->local; 2446 2447 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2448 return; 2449 2450 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET | 2451 IEEE80211_STA_AUTO_BSSID_SEL)) && 2452 (ifsta->flags & (IEEE80211_STA_SSID_SET | 2453 IEEE80211_STA_AUTO_SSID_SEL))) { 2454 2455 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) 2456 ieee80211_set_disassoc(sdata, ifsta, true, true, 2457 WLAN_REASON_DEAUTH_LEAVING); 2458 2459 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request); 2460 queue_work(local->hw.workqueue, &ifsta->work); 2461 } 2462 } 2463 2464 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len) 2465 { 2466 struct ieee80211_if_sta *ifsta; 2467 2468 if (len > IEEE80211_MAX_SSID_LEN) 2469 return -EINVAL; 2470 2471 ifsta = &sdata->u.sta; 2472 2473 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) { 2474 memset(ifsta->ssid, 0, sizeof(ifsta->ssid)); 2475 memcpy(ifsta->ssid, ssid, len); 2476 ifsta->ssid_len = len; 2477 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET; 2478 } 2479 2480 if (len) 2481 ifsta->flags |= IEEE80211_STA_SSID_SET; 2482 else 2483 ifsta->flags &= ~IEEE80211_STA_SSID_SET; 2484 2485 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 2486 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) { 2487 ifsta->ibss_join_req = jiffies; 2488 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH; 2489 return ieee80211_sta_find_ibss(sdata, ifsta); 2490 } 2491 2492 return 0; 2493 } 2494 2495 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len) 2496 { 2497 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2498 memcpy(ssid, ifsta->ssid, ifsta->ssid_len); 2499 *len = ifsta->ssid_len; 2500 return 0; 2501 } 2502 2503 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid) 2504 { 2505 struct ieee80211_if_sta *ifsta; 2506 int res; 2507 2508 ifsta = &sdata->u.sta; 2509 2510 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) { 2511 memcpy(ifsta->bssid, bssid, ETH_ALEN); 2512 res = 0; 2513 /* 2514 * Hack! See also ieee80211_sta_set_ssid. 2515 */ 2516 if (netif_running(sdata->dev)) 2517 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); 2518 if (res) { 2519 printk(KERN_DEBUG "%s: Failed to config new BSSID to " 2520 "the low-level driver\n", sdata->dev->name); 2521 return res; 2522 } 2523 } 2524 2525 if (is_valid_ether_addr(bssid)) 2526 ifsta->flags |= IEEE80211_STA_BSSID_SET; 2527 else 2528 ifsta->flags &= ~IEEE80211_STA_BSSID_SET; 2529 2530 return 0; 2531 } 2532 2533 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len) 2534 { 2535 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2536 2537 kfree(ifsta->extra_ie); 2538 if (len == 0) { 2539 ifsta->extra_ie = NULL; 2540 ifsta->extra_ie_len = 0; 2541 return 0; 2542 } 2543 ifsta->extra_ie = kmalloc(len, GFP_KERNEL); 2544 if (!ifsta->extra_ie) { 2545 ifsta->extra_ie_len = 0; 2546 return -ENOMEM; 2547 } 2548 memcpy(ifsta->extra_ie, ie, len); 2549 ifsta->extra_ie_len = len; 2550 return 0; 2551 } 2552 2553 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason) 2554 { 2555 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2556 2557 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n", 2558 sdata->dev->name, reason); 2559 2560 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2561 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2562 return -EINVAL; 2563 2564 ieee80211_set_disassoc(sdata, ifsta, true, true, reason); 2565 return 0; 2566 } 2567 2568 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason) 2569 { 2570 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2571 2572 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n", 2573 sdata->dev->name, reason); 2574 2575 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2576 return -EINVAL; 2577 2578 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED)) 2579 return -1; 2580 2581 ieee80211_set_disassoc(sdata, ifsta, false, true, reason); 2582 return 0; 2583 } 2584 2585 /* scan finished notification */ 2586 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2587 { 2588 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2589 struct ieee80211_if_sta *ifsta; 2590 2591 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2592 ifsta = &sdata->u.sta; 2593 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) || 2594 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) && 2595 !ieee80211_sta_active_ibss(sdata))) 2596 ieee80211_sta_find_ibss(sdata, ifsta); 2597 } 2598 2599 /* Restart STA timers */ 2600 rcu_read_lock(); 2601 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2602 ieee80211_restart_sta_timer(sdata); 2603 rcu_read_unlock(); 2604 } 2605 2606 void ieee80211_dynamic_ps_disable_work(struct work_struct *work) 2607 { 2608 struct ieee80211_local *local = 2609 container_of(work, struct ieee80211_local, 2610 dynamic_ps_disable_work); 2611 2612 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 2613 local->hw.conf.flags &= ~IEEE80211_CONF_PS; 2614 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2615 } 2616 2617 ieee80211_wake_queues_by_reason(&local->hw, 2618 IEEE80211_QUEUE_STOP_REASON_PS); 2619 } 2620 2621 void ieee80211_dynamic_ps_enable_work(struct work_struct *work) 2622 { 2623 struct ieee80211_local *local = 2624 container_of(work, struct ieee80211_local, 2625 dynamic_ps_enable_work); 2626 2627 if (local->hw.conf.flags & IEEE80211_CONF_PS) 2628 return; 2629 2630 local->hw.conf.flags |= IEEE80211_CONF_PS; 2631 2632 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); 2633 } 2634 2635 void ieee80211_dynamic_ps_timer(unsigned long data) 2636 { 2637 struct ieee80211_local *local = (void *) data; 2638 2639 queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work); 2640 } 2641