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/netdevice.h> 18 #include <linux/if_arp.h> 19 #include <linux/wireless.h> 20 #include <linux/random.h> 21 #include <linux/etherdevice.h> 22 #include <linux/rtnetlink.h> 23 #include <net/iw_handler.h> 24 #include <net/mac80211.h> 25 #include <asm/unaligned.h> 26 27 #include "ieee80211_i.h" 28 #include "rate.h" 29 #include "led.h" 30 31 #define IEEE80211_ASSOC_SCANS_MAX_TRIES 2 32 #define IEEE80211_AUTH_TIMEOUT (HZ / 5) 33 #define IEEE80211_AUTH_MAX_TRIES 3 34 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5) 35 #define IEEE80211_ASSOC_MAX_TRIES 3 36 #define IEEE80211_MONITORING_INTERVAL (2 * HZ) 37 #define IEEE80211_PROBE_INTERVAL (60 * HZ) 38 #define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ) 39 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 40 #define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ) 41 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 42 43 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 44 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 45 46 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 47 48 49 /* utils */ 50 static int ecw2cw(int ecw) 51 { 52 return (1 << ecw) - 1; 53 } 54 55 static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie) 56 { 57 u8 *end, *pos; 58 59 pos = bss->ies; 60 if (pos == NULL) 61 return NULL; 62 end = pos + bss->ies_len; 63 64 while (pos + 1 < end) { 65 if (pos + 2 + pos[1] > end) 66 break; 67 if (pos[0] == ie) 68 return pos; 69 pos += 2 + pos[1]; 70 } 71 72 return NULL; 73 } 74 75 static int ieee80211_compatible_rates(struct ieee80211_bss *bss, 76 struct ieee80211_supported_band *sband, 77 u64 *rates) 78 { 79 int i, j, count; 80 *rates = 0; 81 count = 0; 82 for (i = 0; i < bss->supp_rates_len; i++) { 83 int rate = (bss->supp_rates[i] & 0x7F) * 5; 84 85 for (j = 0; j < sband->n_bitrates; j++) 86 if (sband->bitrates[j].bitrate == rate) { 87 *rates |= BIT(j); 88 count++; 89 break; 90 } 91 } 92 93 return count; 94 } 95 96 /* also used by mesh code */ 97 u64 ieee80211_sta_get_rates(struct ieee80211_local *local, 98 struct ieee802_11_elems *elems, 99 enum ieee80211_band band) 100 { 101 struct ieee80211_supported_band *sband; 102 struct ieee80211_rate *bitrates; 103 size_t num_rates; 104 u64 supp_rates; 105 int i, j; 106 sband = local->hw.wiphy->bands[band]; 107 108 if (!sband) { 109 WARN_ON(1); 110 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 111 } 112 113 bitrates = sband->bitrates; 114 num_rates = sband->n_bitrates; 115 supp_rates = 0; 116 for (i = 0; i < elems->supp_rates_len + 117 elems->ext_supp_rates_len; i++) { 118 u8 rate = 0; 119 int own_rate; 120 if (i < elems->supp_rates_len) 121 rate = elems->supp_rates[i]; 122 else if (elems->ext_supp_rates) 123 rate = elems->ext_supp_rates 124 [i - elems->supp_rates_len]; 125 own_rate = 5 * (rate & 0x7f); 126 for (j = 0; j < num_rates; j++) 127 if (bitrates[j].bitrate == own_rate) 128 supp_rates |= BIT(j); 129 } 130 return supp_rates; 131 } 132 133 /* frame sending functions */ 134 135 /* also used by scanning code */ 136 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst, 137 u8 *ssid, size_t ssid_len) 138 { 139 struct ieee80211_local *local = sdata->local; 140 struct ieee80211_supported_band *sband; 141 struct sk_buff *skb; 142 struct ieee80211_mgmt *mgmt; 143 u8 *pos, *supp_rates, *esupp_rates = NULL; 144 int i; 145 146 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200); 147 if (!skb) { 148 printk(KERN_DEBUG "%s: failed to allocate buffer for probe " 149 "request\n", sdata->dev->name); 150 return; 151 } 152 skb_reserve(skb, local->hw.extra_tx_headroom); 153 154 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 155 memset(mgmt, 0, 24); 156 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 157 IEEE80211_STYPE_PROBE_REQ); 158 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 159 if (dst) { 160 memcpy(mgmt->da, dst, ETH_ALEN); 161 memcpy(mgmt->bssid, dst, ETH_ALEN); 162 } else { 163 memset(mgmt->da, 0xff, ETH_ALEN); 164 memset(mgmt->bssid, 0xff, ETH_ALEN); 165 } 166 pos = skb_put(skb, 2 + ssid_len); 167 *pos++ = WLAN_EID_SSID; 168 *pos++ = ssid_len; 169 memcpy(pos, ssid, ssid_len); 170 171 supp_rates = skb_put(skb, 2); 172 supp_rates[0] = WLAN_EID_SUPP_RATES; 173 supp_rates[1] = 0; 174 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 175 176 for (i = 0; i < sband->n_bitrates; i++) { 177 struct ieee80211_rate *rate = &sband->bitrates[i]; 178 if (esupp_rates) { 179 pos = skb_put(skb, 1); 180 esupp_rates[1]++; 181 } else if (supp_rates[1] == 8) { 182 esupp_rates = skb_put(skb, 3); 183 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES; 184 esupp_rates[1] = 1; 185 pos = &esupp_rates[2]; 186 } else { 187 pos = skb_put(skb, 1); 188 supp_rates[1]++; 189 } 190 *pos = rate->bitrate / 5; 191 } 192 193 ieee80211_tx_skb(sdata, skb, 0); 194 } 195 196 static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata, 197 struct ieee80211_if_sta *ifsta, 198 int transaction, u8 *extra, size_t extra_len, 199 int encrypt) 200 { 201 struct ieee80211_local *local = sdata->local; 202 struct sk_buff *skb; 203 struct ieee80211_mgmt *mgmt; 204 205 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 206 sizeof(*mgmt) + 6 + extra_len); 207 if (!skb) { 208 printk(KERN_DEBUG "%s: failed to allocate buffer for auth " 209 "frame\n", sdata->dev->name); 210 return; 211 } 212 skb_reserve(skb, local->hw.extra_tx_headroom); 213 214 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6); 215 memset(mgmt, 0, 24 + 6); 216 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 217 IEEE80211_STYPE_AUTH); 218 if (encrypt) 219 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 220 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); 221 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 222 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 223 mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg); 224 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction); 225 ifsta->auth_transaction = transaction + 1; 226 mgmt->u.auth.status_code = cpu_to_le16(0); 227 if (extra) 228 memcpy(skb_put(skb, extra_len), extra, extra_len); 229 230 ieee80211_tx_skb(sdata, skb, encrypt); 231 } 232 233 static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, 234 struct ieee80211_if_sta *ifsta) 235 { 236 struct ieee80211_local *local = sdata->local; 237 struct sk_buff *skb; 238 struct ieee80211_mgmt *mgmt; 239 u8 *pos, *ies, *ht_add_ie; 240 int i, len, count, rates_len, supp_rates_len; 241 u16 capab; 242 struct ieee80211_bss *bss; 243 int wmm = 0; 244 struct ieee80211_supported_band *sband; 245 u64 rates = 0; 246 247 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 248 sizeof(*mgmt) + 200 + ifsta->extra_ie_len + 249 ifsta->ssid_len); 250 if (!skb) { 251 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc " 252 "frame\n", sdata->dev->name); 253 return; 254 } 255 skb_reserve(skb, local->hw.extra_tx_headroom); 256 257 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 258 259 capab = ifsta->capab; 260 261 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) { 262 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)) 263 capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME; 264 if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)) 265 capab |= WLAN_CAPABILITY_SHORT_PREAMBLE; 266 } 267 268 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 269 local->hw.conf.channel->center_freq, 270 ifsta->ssid, ifsta->ssid_len); 271 if (bss) { 272 if (bss->capability & WLAN_CAPABILITY_PRIVACY) 273 capab |= WLAN_CAPABILITY_PRIVACY; 274 if (bss->wmm_used) 275 wmm = 1; 276 277 /* get all rates supported by the device and the AP as 278 * some APs don't like getting a superset of their rates 279 * in the association request (e.g. D-Link DAP 1353 in 280 * b-only mode) */ 281 rates_len = ieee80211_compatible_rates(bss, sband, &rates); 282 283 if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) && 284 (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)) 285 capab |= WLAN_CAPABILITY_SPECTRUM_MGMT; 286 287 ieee80211_rx_bss_put(local, bss); 288 } else { 289 rates = ~0; 290 rates_len = sband->n_bitrates; 291 } 292 293 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 294 memset(mgmt, 0, 24); 295 memcpy(mgmt->da, ifsta->bssid, ETH_ALEN); 296 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 297 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 298 299 if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) { 300 skb_put(skb, 10); 301 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 302 IEEE80211_STYPE_REASSOC_REQ); 303 mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab); 304 mgmt->u.reassoc_req.listen_interval = 305 cpu_to_le16(local->hw.conf.listen_interval); 306 memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid, 307 ETH_ALEN); 308 } else { 309 skb_put(skb, 4); 310 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 311 IEEE80211_STYPE_ASSOC_REQ); 312 mgmt->u.assoc_req.capab_info = cpu_to_le16(capab); 313 mgmt->u.reassoc_req.listen_interval = 314 cpu_to_le16(local->hw.conf.listen_interval); 315 } 316 317 /* SSID */ 318 ies = pos = skb_put(skb, 2 + ifsta->ssid_len); 319 *pos++ = WLAN_EID_SSID; 320 *pos++ = ifsta->ssid_len; 321 memcpy(pos, ifsta->ssid, ifsta->ssid_len); 322 323 /* add all rates which were marked to be used above */ 324 supp_rates_len = rates_len; 325 if (supp_rates_len > 8) 326 supp_rates_len = 8; 327 328 len = sband->n_bitrates; 329 pos = skb_put(skb, supp_rates_len + 2); 330 *pos++ = WLAN_EID_SUPP_RATES; 331 *pos++ = supp_rates_len; 332 333 count = 0; 334 for (i = 0; i < sband->n_bitrates; i++) { 335 if (BIT(i) & rates) { 336 int rate = sband->bitrates[i].bitrate; 337 *pos++ = (u8) (rate / 5); 338 if (++count == 8) 339 break; 340 } 341 } 342 343 if (rates_len > count) { 344 pos = skb_put(skb, rates_len - count + 2); 345 *pos++ = WLAN_EID_EXT_SUPP_RATES; 346 *pos++ = rates_len - count; 347 348 for (i++; i < sband->n_bitrates; i++) { 349 if (BIT(i) & rates) { 350 int rate = sband->bitrates[i].bitrate; 351 *pos++ = (u8) (rate / 5); 352 } 353 } 354 } 355 356 if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) { 357 /* 1. power capabilities */ 358 pos = skb_put(skb, 4); 359 *pos++ = WLAN_EID_PWR_CAPABILITY; 360 *pos++ = 2; 361 *pos++ = 0; /* min tx power */ 362 *pos++ = local->hw.conf.channel->max_power; /* max tx power */ 363 364 /* 2. supported channels */ 365 /* TODO: get this in reg domain format */ 366 pos = skb_put(skb, 2 * sband->n_channels + 2); 367 *pos++ = WLAN_EID_SUPPORTED_CHANNELS; 368 *pos++ = 2 * sband->n_channels; 369 for (i = 0; i < sband->n_channels; i++) { 370 *pos++ = ieee80211_frequency_to_channel( 371 sband->channels[i].center_freq); 372 *pos++ = 1; /* one channel in the subband*/ 373 } 374 } 375 376 if (ifsta->extra_ie) { 377 pos = skb_put(skb, ifsta->extra_ie_len); 378 memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len); 379 } 380 381 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) { 382 pos = skb_put(skb, 9); 383 *pos++ = WLAN_EID_VENDOR_SPECIFIC; 384 *pos++ = 7; /* len */ 385 *pos++ = 0x00; /* Microsoft OUI 00:50:F2 */ 386 *pos++ = 0x50; 387 *pos++ = 0xf2; 388 *pos++ = 2; /* WME */ 389 *pos++ = 0; /* WME info */ 390 *pos++ = 1; /* WME ver */ 391 *pos++ = 0; 392 } 393 394 /* wmm support is a must to HT */ 395 if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) && 396 sband->ht_info.ht_supported && 397 (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) { 398 struct ieee80211_ht_addt_info *ht_add_info = 399 (struct ieee80211_ht_addt_info *)ht_add_ie; 400 u16 cap = sband->ht_info.cap; 401 __le16 tmp; 402 u32 flags = local->hw.conf.channel->flags; 403 404 switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) { 405 case IEEE80211_HT_IE_CHA_SEC_ABOVE: 406 if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) { 407 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH; 408 cap &= ~IEEE80211_HT_CAP_SGI_40; 409 } 410 break; 411 case IEEE80211_HT_IE_CHA_SEC_BELOW: 412 if (flags & IEEE80211_CHAN_NO_FAT_BELOW) { 413 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH; 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_info.ampdu_factor | 428 (sband->ht_info.ampdu_density << 2); 429 memcpy(pos, sband->ht_info.supp_mcs_set, 16); 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_protect_preamb(struct ieee80211_sub_if_data *sdata, 572 bool use_protection, 573 bool use_short_preamble) 574 { 575 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf; 576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 577 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 578 DECLARE_MAC_BUF(mac); 579 #endif 580 u32 changed = 0; 581 582 if (use_protection != bss_conf->use_cts_prot) { 583 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 584 if (net_ratelimit()) { 585 printk(KERN_DEBUG "%s: CTS protection %s (BSSID=" 586 "%s)\n", 587 sdata->dev->name, 588 use_protection ? "enabled" : "disabled", 589 print_mac(mac, ifsta->bssid)); 590 } 591 #endif 592 bss_conf->use_cts_prot = use_protection; 593 changed |= BSS_CHANGED_ERP_CTS_PROT; 594 } 595 596 if (use_short_preamble != bss_conf->use_short_preamble) { 597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 598 if (net_ratelimit()) { 599 printk(KERN_DEBUG "%s: switched to %s barker preamble" 600 " (BSSID=%s)\n", 601 sdata->dev->name, 602 use_short_preamble ? "short" : "long", 603 print_mac(mac, ifsta->bssid)); 604 } 605 #endif 606 bss_conf->use_short_preamble = use_short_preamble; 607 changed |= BSS_CHANGED_ERP_PREAMBLE; 608 } 609 610 return changed; 611 } 612 613 static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata, 614 u8 erp_value) 615 { 616 bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0; 617 bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0; 618 619 return ieee80211_handle_protect_preamb(sdata, 620 use_protection, use_short_preamble); 621 } 622 623 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata, 624 struct ieee80211_bss *bss) 625 { 626 u32 changed = 0; 627 628 if (bss->has_erp_value) 629 changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value); 630 else { 631 u16 capab = bss->capability; 632 changed |= ieee80211_handle_protect_preamb(sdata, false, 633 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0); 634 } 635 636 return changed; 637 } 638 639 static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata, 640 struct ieee80211_if_sta *ifsta) 641 { 642 union iwreq_data wrqu; 643 memset(&wrqu, 0, sizeof(wrqu)); 644 if (ifsta->flags & IEEE80211_STA_ASSOCIATED) 645 memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN); 646 wrqu.ap_addr.sa_family = ARPHRD_ETHER; 647 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL); 648 } 649 650 static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata, 651 struct ieee80211_if_sta *ifsta) 652 { 653 char *buf; 654 size_t len; 655 int i; 656 union iwreq_data wrqu; 657 658 if (!ifsta->assocreq_ies && !ifsta->assocresp_ies) 659 return; 660 661 buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len + 662 ifsta->assocresp_ies_len), GFP_KERNEL); 663 if (!buf) 664 return; 665 666 len = sprintf(buf, "ASSOCINFO("); 667 if (ifsta->assocreq_ies) { 668 len += sprintf(buf + len, "ReqIEs="); 669 for (i = 0; i < ifsta->assocreq_ies_len; i++) { 670 len += sprintf(buf + len, "%02x", 671 ifsta->assocreq_ies[i]); 672 } 673 } 674 if (ifsta->assocresp_ies) { 675 if (ifsta->assocreq_ies) 676 len += sprintf(buf + len, " "); 677 len += sprintf(buf + len, "RespIEs="); 678 for (i = 0; i < ifsta->assocresp_ies_len; i++) { 679 len += sprintf(buf + len, "%02x", 680 ifsta->assocresp_ies[i]); 681 } 682 } 683 len += sprintf(buf + len, ")"); 684 685 if (len > IW_CUSTOM_MAX) { 686 len = sprintf(buf, "ASSOCRESPIE="); 687 for (i = 0; i < ifsta->assocresp_ies_len; i++) { 688 len += sprintf(buf + len, "%02x", 689 ifsta->assocresp_ies[i]); 690 } 691 } 692 693 if (len <= IW_CUSTOM_MAX) { 694 memset(&wrqu, 0, sizeof(wrqu)); 695 wrqu.data.length = len; 696 wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf); 697 } 698 699 kfree(buf); 700 } 701 702 703 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata, 704 struct ieee80211_if_sta *ifsta) 705 { 706 struct ieee80211_local *local = sdata->local; 707 struct ieee80211_conf *conf = &local_to_hw(local)->conf; 708 u32 changed = BSS_CHANGED_ASSOC; 709 710 struct ieee80211_bss *bss; 711 712 ifsta->flags |= IEEE80211_STA_ASSOCIATED; 713 714 if (sdata->vif.type != NL80211_IFTYPE_STATION) 715 return; 716 717 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 718 conf->channel->center_freq, 719 ifsta->ssid, ifsta->ssid_len); 720 if (bss) { 721 /* set timing information */ 722 sdata->bss_conf.beacon_int = bss->beacon_int; 723 sdata->bss_conf.timestamp = bss->timestamp; 724 sdata->bss_conf.dtim_period = bss->dtim_period; 725 726 changed |= ieee80211_handle_bss_capability(sdata, bss); 727 728 ieee80211_rx_bss_put(local, bss); 729 } 730 731 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) { 732 changed |= BSS_CHANGED_HT; 733 sdata->bss_conf.assoc_ht = 1; 734 sdata->bss_conf.ht_conf = &conf->ht_conf; 735 sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf; 736 } 737 738 ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET; 739 memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN); 740 ieee80211_sta_send_associnfo(sdata, ifsta); 741 742 ifsta->last_probe = jiffies; 743 ieee80211_led_assoc(local, 1); 744 745 sdata->bss_conf.assoc = 1; 746 /* 747 * For now just always ask the driver to update the basic rateset 748 * when we have associated, we aren't checking whether it actually 749 * changed or not. 750 */ 751 changed |= BSS_CHANGED_BASIC_RATES; 752 ieee80211_bss_info_change_notify(sdata, changed); 753 754 netif_tx_start_all_queues(sdata->dev); 755 netif_carrier_on(sdata->dev); 756 757 ieee80211_sta_send_apinfo(sdata, ifsta); 758 } 759 760 static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata, 761 struct ieee80211_if_sta *ifsta) 762 { 763 DECLARE_MAC_BUF(mac); 764 765 ifsta->direct_probe_tries++; 766 if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) { 767 printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n", 768 sdata->dev->name, print_mac(mac, ifsta->bssid)); 769 ifsta->state = IEEE80211_STA_MLME_DISABLED; 770 return; 771 } 772 773 printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n", 774 sdata->dev->name, print_mac(mac, ifsta->bssid), 775 ifsta->direct_probe_tries); 776 777 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; 778 779 set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request); 780 781 /* Direct probe is sent to broadcast address as some APs 782 * will not answer to direct packet in unassociated state. 783 */ 784 ieee80211_send_probe_req(sdata, NULL, 785 ifsta->ssid, ifsta->ssid_len); 786 787 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT); 788 } 789 790 791 static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata, 792 struct ieee80211_if_sta *ifsta) 793 { 794 DECLARE_MAC_BUF(mac); 795 796 ifsta->auth_tries++; 797 if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) { 798 printk(KERN_DEBUG "%s: authentication with AP %s" 799 " timed out\n", 800 sdata->dev->name, print_mac(mac, ifsta->bssid)); 801 ifsta->state = IEEE80211_STA_MLME_DISABLED; 802 return; 803 } 804 805 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; 806 printk(KERN_DEBUG "%s: authenticate with AP %s\n", 807 sdata->dev->name, print_mac(mac, ifsta->bssid)); 808 809 ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0); 810 811 mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT); 812 } 813 814 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, 815 struct ieee80211_if_sta *ifsta, bool deauth, 816 bool self_disconnected, u16 reason) 817 { 818 struct ieee80211_local *local = sdata->local; 819 struct sta_info *sta; 820 u32 changed = BSS_CHANGED_ASSOC; 821 822 rcu_read_lock(); 823 824 sta = sta_info_get(local, ifsta->bssid); 825 if (!sta) { 826 rcu_read_unlock(); 827 return; 828 } 829 830 if (deauth) { 831 ifsta->direct_probe_tries = 0; 832 ifsta->auth_tries = 0; 833 } 834 ifsta->assoc_scan_tries = 0; 835 ifsta->assoc_tries = 0; 836 837 netif_tx_stop_all_queues(sdata->dev); 838 netif_carrier_off(sdata->dev); 839 840 ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr); 841 842 if (self_disconnected) { 843 if (deauth) 844 ieee80211_send_deauth_disassoc(sdata, 845 IEEE80211_STYPE_DEAUTH, reason); 846 else 847 ieee80211_send_deauth_disassoc(sdata, 848 IEEE80211_STYPE_DISASSOC, reason); 849 } 850 851 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED; 852 changed |= ieee80211_reset_erp_info(sdata); 853 854 if (sdata->bss_conf.assoc_ht) 855 changed |= BSS_CHANGED_HT; 856 857 sdata->bss_conf.assoc_ht = 0; 858 sdata->bss_conf.ht_conf = NULL; 859 sdata->bss_conf.ht_bss_conf = NULL; 860 861 ieee80211_led_assoc(local, 0); 862 sdata->bss_conf.assoc = 0; 863 864 ieee80211_sta_send_apinfo(sdata, ifsta); 865 866 if (self_disconnected) 867 ifsta->state = IEEE80211_STA_MLME_DISABLED; 868 869 sta_info_unlink(&sta); 870 871 rcu_read_unlock(); 872 873 sta_info_destroy(sta); 874 } 875 876 static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata) 877 { 878 if (!sdata || !sdata->default_key || 879 sdata->default_key->conf.alg != ALG_WEP) 880 return 0; 881 return 1; 882 } 883 884 static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata, 885 struct ieee80211_if_sta *ifsta) 886 { 887 struct ieee80211_local *local = sdata->local; 888 struct ieee80211_bss *bss; 889 int bss_privacy; 890 int wep_privacy; 891 int privacy_invoked; 892 893 if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL)) 894 return 0; 895 896 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 897 local->hw.conf.channel->center_freq, 898 ifsta->ssid, ifsta->ssid_len); 899 if (!bss) 900 return 0; 901 902 bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY); 903 wep_privacy = !!ieee80211_sta_wep_configured(sdata); 904 privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED); 905 906 ieee80211_rx_bss_put(local, bss); 907 908 if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked)) 909 return 0; 910 911 return 1; 912 } 913 914 static void ieee80211_associate(struct ieee80211_sub_if_data *sdata, 915 struct ieee80211_if_sta *ifsta) 916 { 917 DECLARE_MAC_BUF(mac); 918 919 ifsta->assoc_tries++; 920 if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) { 921 printk(KERN_DEBUG "%s: association with AP %s" 922 " timed out\n", 923 sdata->dev->name, print_mac(mac, ifsta->bssid)); 924 ifsta->state = IEEE80211_STA_MLME_DISABLED; 925 return; 926 } 927 928 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE; 929 printk(KERN_DEBUG "%s: associate with AP %s\n", 930 sdata->dev->name, print_mac(mac, ifsta->bssid)); 931 if (ieee80211_privacy_mismatch(sdata, ifsta)) { 932 printk(KERN_DEBUG "%s: mismatch in privacy configuration and " 933 "mixed-cell disabled - abort association\n", sdata->dev->name); 934 ifsta->state = IEEE80211_STA_MLME_DISABLED; 935 return; 936 } 937 938 ieee80211_send_assoc(sdata, ifsta); 939 940 mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT); 941 } 942 943 944 static void ieee80211_associated(struct ieee80211_sub_if_data *sdata, 945 struct ieee80211_if_sta *ifsta) 946 { 947 struct ieee80211_local *local = sdata->local; 948 struct sta_info *sta; 949 int disassoc; 950 DECLARE_MAC_BUF(mac); 951 952 /* TODO: start monitoring current AP signal quality and number of 953 * missed beacons. Scan other channels every now and then and search 954 * for better APs. */ 955 /* TODO: remove expired BSSes */ 956 957 ifsta->state = IEEE80211_STA_MLME_ASSOCIATED; 958 959 rcu_read_lock(); 960 961 sta = sta_info_get(local, ifsta->bssid); 962 if (!sta) { 963 printk(KERN_DEBUG "%s: No STA entry for own AP %s\n", 964 sdata->dev->name, print_mac(mac, ifsta->bssid)); 965 disassoc = 1; 966 } else { 967 disassoc = 0; 968 if (time_after(jiffies, 969 sta->last_rx + IEEE80211_MONITORING_INTERVAL)) { 970 if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) { 971 printk(KERN_DEBUG "%s: No ProbeResp from " 972 "current AP %s - assume out of " 973 "range\n", 974 sdata->dev->name, print_mac(mac, ifsta->bssid)); 975 disassoc = 1; 976 } else 977 ieee80211_send_probe_req(sdata, ifsta->bssid, 978 ifsta->ssid, 979 ifsta->ssid_len); 980 ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL; 981 } else { 982 ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL; 983 if (time_after(jiffies, ifsta->last_probe + 984 IEEE80211_PROBE_INTERVAL)) { 985 ifsta->last_probe = jiffies; 986 ieee80211_send_probe_req(sdata, ifsta->bssid, 987 ifsta->ssid, 988 ifsta->ssid_len); 989 } 990 } 991 } 992 993 rcu_read_unlock(); 994 995 if (disassoc) 996 ieee80211_set_disassoc(sdata, ifsta, true, true, 997 WLAN_REASON_PREV_AUTH_NOT_VALID); 998 else 999 mod_timer(&ifsta->timer, jiffies + 1000 IEEE80211_MONITORING_INTERVAL); 1001 } 1002 1003 1004 static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata, 1005 struct ieee80211_if_sta *ifsta) 1006 { 1007 printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name); 1008 ifsta->flags |= IEEE80211_STA_AUTHENTICATED; 1009 ieee80211_associate(sdata, ifsta); 1010 } 1011 1012 1013 static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata, 1014 struct ieee80211_if_sta *ifsta, 1015 struct ieee80211_mgmt *mgmt, 1016 size_t len) 1017 { 1018 u8 *pos; 1019 struct ieee802_11_elems elems; 1020 1021 pos = mgmt->u.auth.variable; 1022 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1023 if (!elems.challenge) 1024 return; 1025 ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2, 1026 elems.challenge_len + 2, 1); 1027 } 1028 1029 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata, 1030 struct ieee80211_if_sta *ifsta, 1031 struct ieee80211_mgmt *mgmt, 1032 size_t len) 1033 { 1034 u16 auth_alg, auth_transaction, status_code; 1035 DECLARE_MAC_BUF(mac); 1036 1037 if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE && 1038 sdata->vif.type != NL80211_IFTYPE_ADHOC) 1039 return; 1040 1041 if (len < 24 + 6) 1042 return; 1043 1044 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 1045 memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) 1046 return; 1047 1048 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 1049 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) 1050 return; 1051 1052 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 1053 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 1054 status_code = le16_to_cpu(mgmt->u.auth.status_code); 1055 1056 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 1057 /* 1058 * IEEE 802.11 standard does not require authentication in IBSS 1059 * networks and most implementations do not seem to use it. 1060 * However, try to reply to authentication attempts if someone 1061 * has actually implemented this. 1062 */ 1063 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 1064 return; 1065 ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0); 1066 } 1067 1068 if (auth_alg != ifsta->auth_alg || 1069 auth_transaction != ifsta->auth_transaction) 1070 return; 1071 1072 if (status_code != WLAN_STATUS_SUCCESS) { 1073 if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) { 1074 u8 algs[3]; 1075 const int num_algs = ARRAY_SIZE(algs); 1076 int i, pos; 1077 algs[0] = algs[1] = algs[2] = 0xff; 1078 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN) 1079 algs[0] = WLAN_AUTH_OPEN; 1080 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) 1081 algs[1] = WLAN_AUTH_SHARED_KEY; 1082 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP) 1083 algs[2] = WLAN_AUTH_LEAP; 1084 if (ifsta->auth_alg == WLAN_AUTH_OPEN) 1085 pos = 0; 1086 else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY) 1087 pos = 1; 1088 else 1089 pos = 2; 1090 for (i = 0; i < num_algs; i++) { 1091 pos++; 1092 if (pos >= num_algs) 1093 pos = 0; 1094 if (algs[pos] == ifsta->auth_alg || 1095 algs[pos] == 0xff) 1096 continue; 1097 if (algs[pos] == WLAN_AUTH_SHARED_KEY && 1098 !ieee80211_sta_wep_configured(sdata)) 1099 continue; 1100 ifsta->auth_alg = algs[pos]; 1101 break; 1102 } 1103 } 1104 return; 1105 } 1106 1107 switch (ifsta->auth_alg) { 1108 case WLAN_AUTH_OPEN: 1109 case WLAN_AUTH_LEAP: 1110 ieee80211_auth_completed(sdata, ifsta); 1111 break; 1112 case WLAN_AUTH_SHARED_KEY: 1113 if (ifsta->auth_transaction == 4) 1114 ieee80211_auth_completed(sdata, ifsta); 1115 else 1116 ieee80211_auth_challenge(sdata, ifsta, mgmt, len); 1117 break; 1118 } 1119 } 1120 1121 1122 static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata, 1123 struct ieee80211_if_sta *ifsta, 1124 struct ieee80211_mgmt *mgmt, 1125 size_t len) 1126 { 1127 u16 reason_code; 1128 DECLARE_MAC_BUF(mac); 1129 1130 if (len < 24 + 2) 1131 return; 1132 1133 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN)) 1134 return; 1135 1136 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code); 1137 1138 if (ifsta->flags & IEEE80211_STA_AUTHENTICATED) 1139 printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name); 1140 1141 if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE || 1142 ifsta->state == IEEE80211_STA_MLME_ASSOCIATE || 1143 ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) { 1144 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; 1145 mod_timer(&ifsta->timer, jiffies + 1146 IEEE80211_RETRY_AUTH_INTERVAL); 1147 } 1148 1149 ieee80211_set_disassoc(sdata, ifsta, true, false, 0); 1150 ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED; 1151 } 1152 1153 1154 static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata, 1155 struct ieee80211_if_sta *ifsta, 1156 struct ieee80211_mgmt *mgmt, 1157 size_t len) 1158 { 1159 u16 reason_code; 1160 DECLARE_MAC_BUF(mac); 1161 1162 if (len < 24 + 2) 1163 return; 1164 1165 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN)) 1166 return; 1167 1168 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code); 1169 1170 if (ifsta->flags & IEEE80211_STA_ASSOCIATED) 1171 printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name); 1172 1173 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) { 1174 ifsta->state = IEEE80211_STA_MLME_ASSOCIATE; 1175 mod_timer(&ifsta->timer, jiffies + 1176 IEEE80211_RETRY_AUTH_INTERVAL); 1177 } 1178 1179 ieee80211_set_disassoc(sdata, ifsta, false, false, 0); 1180 } 1181 1182 1183 static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata, 1184 struct ieee80211_if_sta *ifsta, 1185 struct ieee80211_mgmt *mgmt, 1186 size_t len, 1187 int reassoc) 1188 { 1189 struct ieee80211_local *local = sdata->local; 1190 struct ieee80211_supported_band *sband; 1191 struct sta_info *sta; 1192 u64 rates, basic_rates; 1193 u16 capab_info, status_code, aid; 1194 struct ieee802_11_elems elems; 1195 struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf; 1196 u8 *pos; 1197 int i, j; 1198 DECLARE_MAC_BUF(mac); 1199 bool have_higher_than_11mbit = false; 1200 1201 /* AssocResp and ReassocResp have identical structure, so process both 1202 * of them in this function. */ 1203 1204 if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE) 1205 return; 1206 1207 if (len < 24 + 6) 1208 return; 1209 1210 if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0) 1211 return; 1212 1213 capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info); 1214 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code); 1215 aid = le16_to_cpu(mgmt->u.assoc_resp.aid); 1216 1217 printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x " 1218 "status=%d aid=%d)\n", 1219 sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa), 1220 capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14)))); 1221 1222 if (status_code != WLAN_STATUS_SUCCESS) { 1223 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n", 1224 sdata->dev->name, status_code); 1225 /* if this was a reassociation, ensure we try a "full" 1226 * association next time. This works around some broken APs 1227 * which do not correctly reject reassociation requests. */ 1228 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET; 1229 return; 1230 } 1231 1232 if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14))) 1233 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not " 1234 "set\n", sdata->dev->name, aid); 1235 aid &= ~(BIT(15) | BIT(14)); 1236 1237 pos = mgmt->u.assoc_resp.variable; 1238 ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems); 1239 1240 if (!elems.supp_rates) { 1241 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n", 1242 sdata->dev->name); 1243 return; 1244 } 1245 1246 printk(KERN_DEBUG "%s: associated\n", sdata->dev->name); 1247 ifsta->aid = aid; 1248 ifsta->ap_capab = capab_info; 1249 1250 kfree(ifsta->assocresp_ies); 1251 ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt); 1252 ifsta->assocresp_ies = kmalloc(ifsta->assocresp_ies_len, GFP_KERNEL); 1253 if (ifsta->assocresp_ies) 1254 memcpy(ifsta->assocresp_ies, pos, ifsta->assocresp_ies_len); 1255 1256 rcu_read_lock(); 1257 1258 /* Add STA entry for the AP */ 1259 sta = sta_info_get(local, ifsta->bssid); 1260 if (!sta) { 1261 struct ieee80211_bss *bss; 1262 int err; 1263 1264 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC); 1265 if (!sta) { 1266 printk(KERN_DEBUG "%s: failed to alloc STA entry for" 1267 " the AP\n", sdata->dev->name); 1268 rcu_read_unlock(); 1269 return; 1270 } 1271 bss = ieee80211_rx_bss_get(local, ifsta->bssid, 1272 local->hw.conf.channel->center_freq, 1273 ifsta->ssid, ifsta->ssid_len); 1274 if (bss) { 1275 sta->last_signal = bss->signal; 1276 sta->last_qual = bss->qual; 1277 sta->last_noise = bss->noise; 1278 ieee80211_rx_bss_put(local, bss); 1279 } 1280 1281 err = sta_info_insert(sta); 1282 if (err) { 1283 printk(KERN_DEBUG "%s: failed to insert STA entry for" 1284 " the AP (error %d)\n", sdata->dev->name, err); 1285 rcu_read_unlock(); 1286 return; 1287 } 1288 /* update new sta with its last rx activity */ 1289 sta->last_rx = jiffies; 1290 } 1291 1292 /* 1293 * FIXME: Do we really need to update the sta_info's information here? 1294 * We already know about the AP (we found it in our list) so it 1295 * should already be filled with the right info, no? 1296 * As is stands, all this is racy because typically we assume 1297 * the information that is filled in here (except flags) doesn't 1298 * change while a STA structure is alive. As such, it should move 1299 * to between the sta_info_alloc() and sta_info_insert() above. 1300 */ 1301 1302 set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC | WLAN_STA_ASSOC_AP | 1303 WLAN_STA_AUTHORIZED); 1304 1305 rates = 0; 1306 basic_rates = 0; 1307 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1308 1309 for (i = 0; i < elems.supp_rates_len; i++) { 1310 int rate = (elems.supp_rates[i] & 0x7f) * 5; 1311 1312 if (rate > 110) 1313 have_higher_than_11mbit = true; 1314 1315 for (j = 0; j < sband->n_bitrates; j++) { 1316 if (sband->bitrates[j].bitrate == rate) 1317 rates |= BIT(j); 1318 if (elems.supp_rates[i] & 0x80) 1319 basic_rates |= BIT(j); 1320 } 1321 } 1322 1323 for (i = 0; i < elems.ext_supp_rates_len; i++) { 1324 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5; 1325 1326 if (rate > 110) 1327 have_higher_than_11mbit = true; 1328 1329 for (j = 0; j < sband->n_bitrates; j++) { 1330 if (sband->bitrates[j].bitrate == rate) 1331 rates |= BIT(j); 1332 if (elems.ext_supp_rates[i] & 0x80) 1333 basic_rates |= BIT(j); 1334 } 1335 } 1336 1337 sta->sta.supp_rates[local->hw.conf.channel->band] = rates; 1338 sdata->bss_conf.basic_rates = basic_rates; 1339 1340 /* cf. IEEE 802.11 9.2.12 */ 1341 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ && 1342 have_higher_than_11mbit) 1343 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE; 1344 else 1345 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE; 1346 1347 if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param && 1348 (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) { 1349 struct ieee80211_ht_bss_info bss_info; 1350 ieee80211_ht_cap_ie_to_ht_info( 1351 (struct ieee80211_ht_cap *) 1352 elems.ht_cap_elem, &sta->sta.ht_info); 1353 ieee80211_ht_addt_info_ie_to_ht_bss_info( 1354 (struct ieee80211_ht_addt_info *) 1355 elems.ht_info_elem, &bss_info); 1356 ieee80211_handle_ht(local, 1, &sta->sta.ht_info, &bss_info); 1357 } 1358 1359 rate_control_rate_init(sta); 1360 1361 if (elems.wmm_param) { 1362 set_sta_flags(sta, WLAN_STA_WME); 1363 rcu_read_unlock(); 1364 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param, 1365 elems.wmm_param_len); 1366 } else 1367 rcu_read_unlock(); 1368 1369 /* set AID and assoc capability, 1370 * ieee80211_set_associated() will tell the driver */ 1371 bss_conf->aid = aid; 1372 bss_conf->assoc_capability = capab_info; 1373 ieee80211_set_associated(sdata, ifsta); 1374 1375 ieee80211_associated(sdata, ifsta); 1376 } 1377 1378 1379 static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 1380 struct ieee80211_if_sta *ifsta, 1381 struct ieee80211_bss *bss) 1382 { 1383 struct ieee80211_local *local = sdata->local; 1384 int res, rates, i, j; 1385 struct sk_buff *skb; 1386 struct ieee80211_mgmt *mgmt; 1387 u8 *pos; 1388 struct ieee80211_supported_band *sband; 1389 union iwreq_data wrqu; 1390 1391 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1392 1393 /* Remove possible STA entries from other IBSS networks. */ 1394 sta_info_flush_delayed(sdata); 1395 1396 if (local->ops->reset_tsf) { 1397 /* Reset own TSF to allow time synchronization work. */ 1398 local->ops->reset_tsf(local_to_hw(local)); 1399 } 1400 memcpy(ifsta->bssid, bss->bssid, ETH_ALEN); 1401 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); 1402 if (res) 1403 return res; 1404 1405 local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10; 1406 1407 sdata->drop_unencrypted = bss->capability & 1408 WLAN_CAPABILITY_PRIVACY ? 1 : 0; 1409 1410 res = ieee80211_set_freq(sdata, bss->freq); 1411 1412 if (res) 1413 return res; 1414 1415 /* Build IBSS probe response */ 1416 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); 1417 if (skb) { 1418 skb_reserve(skb, local->hw.extra_tx_headroom); 1419 1420 mgmt = (struct ieee80211_mgmt *) 1421 skb_put(skb, 24 + sizeof(mgmt->u.beacon)); 1422 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon)); 1423 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 1424 IEEE80211_STYPE_PROBE_RESP); 1425 memset(mgmt->da, 0xff, ETH_ALEN); 1426 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 1427 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); 1428 mgmt->u.beacon.beacon_int = 1429 cpu_to_le16(local->hw.conf.beacon_int); 1430 mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp); 1431 mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability); 1432 1433 pos = skb_put(skb, 2 + ifsta->ssid_len); 1434 *pos++ = WLAN_EID_SSID; 1435 *pos++ = ifsta->ssid_len; 1436 memcpy(pos, ifsta->ssid, ifsta->ssid_len); 1437 1438 rates = bss->supp_rates_len; 1439 if (rates > 8) 1440 rates = 8; 1441 pos = skb_put(skb, 2 + rates); 1442 *pos++ = WLAN_EID_SUPP_RATES; 1443 *pos++ = rates; 1444 memcpy(pos, bss->supp_rates, rates); 1445 1446 if (bss->band == IEEE80211_BAND_2GHZ) { 1447 pos = skb_put(skb, 2 + 1); 1448 *pos++ = WLAN_EID_DS_PARAMS; 1449 *pos++ = 1; 1450 *pos++ = ieee80211_frequency_to_channel(bss->freq); 1451 } 1452 1453 pos = skb_put(skb, 2 + 2); 1454 *pos++ = WLAN_EID_IBSS_PARAMS; 1455 *pos++ = 2; 1456 /* FIX: set ATIM window based on scan results */ 1457 *pos++ = 0; 1458 *pos++ = 0; 1459 1460 if (bss->supp_rates_len > 8) { 1461 rates = bss->supp_rates_len - 8; 1462 pos = skb_put(skb, 2 + rates); 1463 *pos++ = WLAN_EID_EXT_SUPP_RATES; 1464 *pos++ = rates; 1465 memcpy(pos, &bss->supp_rates[8], rates); 1466 } 1467 1468 ifsta->probe_resp = skb; 1469 1470 ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON); 1471 } 1472 1473 rates = 0; 1474 sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; 1475 for (i = 0; i < bss->supp_rates_len; i++) { 1476 int bitrate = (bss->supp_rates[i] & 0x7f) * 5; 1477 for (j = 0; j < sband->n_bitrates; j++) 1478 if (sband->bitrates[j].bitrate == bitrate) 1479 rates |= BIT(j); 1480 } 1481 ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates; 1482 1483 ieee80211_sta_def_wmm_params(sdata, bss); 1484 1485 ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED; 1486 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL); 1487 1488 ieee80211_led_assoc(local, true); 1489 1490 memset(&wrqu, 0, sizeof(wrqu)); 1491 memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN); 1492 wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL); 1493 1494 return res; 1495 } 1496 1497 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1498 struct ieee80211_mgmt *mgmt, 1499 size_t len, 1500 struct ieee80211_rx_status *rx_status, 1501 struct ieee802_11_elems *elems, 1502 bool beacon) 1503 { 1504 struct ieee80211_local *local = sdata->local; 1505 int freq; 1506 struct ieee80211_bss *bss; 1507 struct sta_info *sta; 1508 struct ieee80211_channel *channel; 1509 u64 beacon_timestamp, rx_timestamp; 1510 u64 supp_rates = 0; 1511 enum ieee80211_band band = rx_status->band; 1512 DECLARE_MAC_BUF(mac); 1513 DECLARE_MAC_BUF(mac2); 1514 1515 if (elems->ds_params && elems->ds_params_len == 1) 1516 freq = ieee80211_channel_to_frequency(elems->ds_params[0]); 1517 else 1518 freq = rx_status->freq; 1519 1520 channel = ieee80211_get_channel(local->hw.wiphy, freq); 1521 1522 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) 1523 return; 1524 1525 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && elems->supp_rates && 1526 memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0) { 1527 supp_rates = ieee80211_sta_get_rates(local, elems, band); 1528 1529 rcu_read_lock(); 1530 1531 sta = sta_info_get(local, mgmt->sa); 1532 if (sta) { 1533 u64 prev_rates; 1534 1535 prev_rates = sta->sta.supp_rates[band]; 1536 /* make sure mandatory rates are always added */ 1537 sta->sta.supp_rates[band] = supp_rates | 1538 ieee80211_mandatory_rates(local, band); 1539 1540 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1541 if (sta->sta.supp_rates[band] != prev_rates) 1542 printk(KERN_DEBUG "%s: updated supp_rates set " 1543 "for %s based on beacon info (0x%llx | " 1544 "0x%llx -> 0x%llx)\n", 1545 sdata->dev->name, 1546 print_mac(mac, sta->sta.addr), 1547 (unsigned long long) prev_rates, 1548 (unsigned long long) supp_rates, 1549 (unsigned long long) sta->sta.supp_rates[band]); 1550 #endif 1551 } else { 1552 ieee80211_ibss_add_sta(sdata, NULL, mgmt->bssid, 1553 mgmt->sa, supp_rates); 1554 } 1555 1556 rcu_read_unlock(); 1557 } 1558 1559 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, 1560 freq, beacon); 1561 if (!bss) 1562 return; 1563 1564 /* was just updated in ieee80211_bss_info_update */ 1565 beacon_timestamp = bss->timestamp; 1566 1567 /* 1568 * In STA mode, the remaining parameters should not be overridden 1569 * by beacons because they're not necessarily accurate there. 1570 */ 1571 if (sdata->vif.type != NL80211_IFTYPE_ADHOC && 1572 bss->last_probe_resp && beacon) { 1573 ieee80211_rx_bss_put(local, bss); 1574 return; 1575 } 1576 1577 /* check if we need to merge IBSS */ 1578 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon && 1579 bss->capability & WLAN_CAPABILITY_IBSS && 1580 bss->freq == local->oper_channel->center_freq && 1581 elems->ssid_len == sdata->u.sta.ssid_len && 1582 memcmp(elems->ssid, sdata->u.sta.ssid, 1583 sdata->u.sta.ssid_len) == 0) { 1584 if (rx_status->flag & RX_FLAG_TSFT) { 1585 /* in order for correct IBSS merging we need mactime 1586 * 1587 * since mactime is defined as the time the first data 1588 * symbol of the frame hits the PHY, and the timestamp 1589 * of the beacon is defined as "the time that the data 1590 * symbol containing the first bit of the timestamp is 1591 * transmitted to the PHY plus the transmitting STA’s 1592 * delays through its local PHY from the MAC-PHY 1593 * interface to its interface with the WM" 1594 * (802.11 11.1.2) - equals the time this bit arrives at 1595 * the receiver - we have to take into account the 1596 * offset between the two. 1597 * e.g: at 1 MBit that means mactime is 192 usec earlier 1598 * (=24 bytes * 8 usecs/byte) than the beacon timestamp. 1599 */ 1600 int rate = local->hw.wiphy->bands[band]-> 1601 bitrates[rx_status->rate_idx].bitrate; 1602 rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); 1603 } else if (local && local->ops && local->ops->get_tsf) 1604 /* second best option: get current TSF */ 1605 rx_timestamp = local->ops->get_tsf(local_to_hw(local)); 1606 else 1607 /* can't merge without knowing the TSF */ 1608 rx_timestamp = -1LLU; 1609 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1610 printk(KERN_DEBUG "RX beacon SA=%s BSSID=" 1611 "%s TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", 1612 print_mac(mac, mgmt->sa), 1613 print_mac(mac2, mgmt->bssid), 1614 (unsigned long long)rx_timestamp, 1615 (unsigned long long)beacon_timestamp, 1616 (unsigned long long)(rx_timestamp - beacon_timestamp), 1617 jiffies); 1618 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 1619 if (beacon_timestamp > rx_timestamp) { 1620 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1621 printk(KERN_DEBUG "%s: beacon TSF higher than " 1622 "local TSF - IBSS merge with BSSID %s\n", 1623 sdata->dev->name, print_mac(mac, mgmt->bssid)); 1624 #endif 1625 ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss); 1626 ieee80211_ibss_add_sta(sdata, NULL, 1627 mgmt->bssid, mgmt->sa, 1628 supp_rates); 1629 } 1630 } 1631 1632 ieee80211_rx_bss_put(local, bss); 1633 } 1634 1635 1636 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata, 1637 struct ieee80211_mgmt *mgmt, 1638 size_t len, 1639 struct ieee80211_rx_status *rx_status) 1640 { 1641 size_t baselen; 1642 struct ieee802_11_elems elems; 1643 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 1644 1645 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN)) 1646 return; /* ignore ProbeResp to foreign address */ 1647 1648 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1649 if (baselen > len) 1650 return; 1651 1652 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen, 1653 &elems); 1654 1655 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false); 1656 1657 /* direct probe may be part of the association flow */ 1658 if (test_and_clear_bit(IEEE80211_STA_REQ_DIRECT_PROBE, 1659 &ifsta->request)) { 1660 printk(KERN_DEBUG "%s direct probe responded\n", 1661 sdata->dev->name); 1662 ieee80211_authenticate(sdata, ifsta); 1663 } 1664 } 1665 1666 1667 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 1668 struct ieee80211_mgmt *mgmt, 1669 size_t len, 1670 struct ieee80211_rx_status *rx_status) 1671 { 1672 struct ieee80211_if_sta *ifsta; 1673 size_t baselen; 1674 struct ieee802_11_elems elems; 1675 struct ieee80211_local *local = sdata->local; 1676 struct ieee80211_conf *conf = &local->hw.conf; 1677 u32 changed = 0; 1678 1679 /* Process beacon from the current BSS */ 1680 baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt; 1681 if (baselen > len) 1682 return; 1683 1684 ieee802_11_parse_elems(mgmt->u.beacon.variable, len - baselen, &elems); 1685 1686 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true); 1687 1688 if (sdata->vif.type != NL80211_IFTYPE_STATION) 1689 return; 1690 ifsta = &sdata->u.sta; 1691 1692 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED) || 1693 memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0) 1694 return; 1695 1696 ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param, 1697 elems.wmm_param_len); 1698 1699 if (elems.erp_info && elems.erp_info_len >= 1) 1700 changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]); 1701 else { 1702 u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info); 1703 changed |= ieee80211_handle_protect_preamb(sdata, false, 1704 (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0); 1705 } 1706 1707 if (elems.ht_cap_elem && elems.ht_info_elem && 1708 elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) { 1709 struct ieee80211_ht_bss_info bss_info; 1710 1711 ieee80211_ht_addt_info_ie_to_ht_bss_info( 1712 (struct ieee80211_ht_addt_info *) 1713 elems.ht_info_elem, &bss_info); 1714 changed |= ieee80211_handle_ht(local, 1, &conf->ht_conf, 1715 &bss_info); 1716 } 1717 1718 ieee80211_bss_info_change_notify(sdata, changed); 1719 } 1720 1721 1722 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1723 struct ieee80211_if_sta *ifsta, 1724 struct ieee80211_mgmt *mgmt, 1725 size_t len, 1726 struct ieee80211_rx_status *rx_status) 1727 { 1728 struct ieee80211_local *local = sdata->local; 1729 int tx_last_beacon; 1730 struct sk_buff *skb; 1731 struct ieee80211_mgmt *resp; 1732 u8 *pos, *end; 1733 DECLARE_MAC_BUF(mac); 1734 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1735 DECLARE_MAC_BUF(mac2); 1736 DECLARE_MAC_BUF(mac3); 1737 #endif 1738 1739 if (sdata->vif.type != NL80211_IFTYPE_ADHOC || 1740 ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED || 1741 len < 24 + 2 || !ifsta->probe_resp) 1742 return; 1743 1744 if (local->ops->tx_last_beacon) 1745 tx_last_beacon = local->ops->tx_last_beacon(local_to_hw(local)); 1746 else 1747 tx_last_beacon = 1; 1748 1749 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1750 printk(KERN_DEBUG "%s: RX ProbeReq SA=%s DA=%s BSSID=" 1751 "%s (tx_last_beacon=%d)\n", 1752 sdata->dev->name, print_mac(mac, mgmt->sa), print_mac(mac2, mgmt->da), 1753 print_mac(mac3, mgmt->bssid), tx_last_beacon); 1754 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 1755 1756 if (!tx_last_beacon) 1757 return; 1758 1759 if (memcmp(mgmt->bssid, ifsta->bssid, ETH_ALEN) != 0 && 1760 memcmp(mgmt->bssid, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0) 1761 return; 1762 1763 end = ((u8 *) mgmt) + len; 1764 pos = mgmt->u.probe_req.variable; 1765 if (pos[0] != WLAN_EID_SSID || 1766 pos + 2 + pos[1] > end) { 1767 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1768 printk(KERN_DEBUG "%s: Invalid SSID IE in ProbeReq " 1769 "from %s\n", 1770 sdata->dev->name, print_mac(mac, mgmt->sa)); 1771 #endif 1772 return; 1773 } 1774 if (pos[1] != 0 && 1775 (pos[1] != ifsta->ssid_len || 1776 memcmp(pos + 2, ifsta->ssid, ifsta->ssid_len) != 0)) { 1777 /* Ignore ProbeReq for foreign SSID */ 1778 return; 1779 } 1780 1781 /* Reply with ProbeResp */ 1782 skb = skb_copy(ifsta->probe_resp, GFP_KERNEL); 1783 if (!skb) 1784 return; 1785 1786 resp = (struct ieee80211_mgmt *) skb->data; 1787 memcpy(resp->da, mgmt->sa, ETH_ALEN); 1788 #ifdef CONFIG_MAC80211_IBSS_DEBUG 1789 printk(KERN_DEBUG "%s: Sending ProbeResp to %s\n", 1790 sdata->dev->name, print_mac(mac, resp->da)); 1791 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 1792 ieee80211_tx_skb(sdata, skb, 0); 1793 } 1794 1795 void ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1796 struct ieee80211_rx_status *rx_status) 1797 { 1798 struct ieee80211_local *local = sdata->local; 1799 struct ieee80211_if_sta *ifsta; 1800 struct ieee80211_mgmt *mgmt; 1801 u16 fc; 1802 1803 if (skb->len < 24) 1804 goto fail; 1805 1806 ifsta = &sdata->u.sta; 1807 1808 mgmt = (struct ieee80211_mgmt *) skb->data; 1809 fc = le16_to_cpu(mgmt->frame_control); 1810 1811 switch (fc & IEEE80211_FCTL_STYPE) { 1812 case IEEE80211_STYPE_PROBE_REQ: 1813 case IEEE80211_STYPE_PROBE_RESP: 1814 case IEEE80211_STYPE_BEACON: 1815 memcpy(skb->cb, rx_status, sizeof(*rx_status)); 1816 case IEEE80211_STYPE_AUTH: 1817 case IEEE80211_STYPE_ASSOC_RESP: 1818 case IEEE80211_STYPE_REASSOC_RESP: 1819 case IEEE80211_STYPE_DEAUTH: 1820 case IEEE80211_STYPE_DISASSOC: 1821 skb_queue_tail(&ifsta->skb_queue, skb); 1822 queue_work(local->hw.workqueue, &ifsta->work); 1823 return; 1824 } 1825 1826 fail: 1827 kfree_skb(skb); 1828 } 1829 1830 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1831 struct sk_buff *skb) 1832 { 1833 struct ieee80211_rx_status *rx_status; 1834 struct ieee80211_if_sta *ifsta; 1835 struct ieee80211_mgmt *mgmt; 1836 u16 fc; 1837 1838 ifsta = &sdata->u.sta; 1839 1840 rx_status = (struct ieee80211_rx_status *) skb->cb; 1841 mgmt = (struct ieee80211_mgmt *) skb->data; 1842 fc = le16_to_cpu(mgmt->frame_control); 1843 1844 switch (fc & IEEE80211_FCTL_STYPE) { 1845 case IEEE80211_STYPE_PROBE_REQ: 1846 ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len, 1847 rx_status); 1848 break; 1849 case IEEE80211_STYPE_PROBE_RESP: 1850 ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status); 1851 break; 1852 case IEEE80211_STYPE_BEACON: 1853 ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status); 1854 break; 1855 case IEEE80211_STYPE_AUTH: 1856 ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len); 1857 break; 1858 case IEEE80211_STYPE_ASSOC_RESP: 1859 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0); 1860 break; 1861 case IEEE80211_STYPE_REASSOC_RESP: 1862 ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1); 1863 break; 1864 case IEEE80211_STYPE_DEAUTH: 1865 ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len); 1866 break; 1867 case IEEE80211_STYPE_DISASSOC: 1868 ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len); 1869 break; 1870 } 1871 1872 kfree_skb(skb); 1873 } 1874 1875 1876 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 1877 { 1878 struct ieee80211_local *local = sdata->local; 1879 int active = 0; 1880 struct sta_info *sta; 1881 1882 rcu_read_lock(); 1883 1884 list_for_each_entry_rcu(sta, &local->sta_list, list) { 1885 if (sta->sdata == sdata && 1886 time_after(sta->last_rx + IEEE80211_IBSS_MERGE_INTERVAL, 1887 jiffies)) { 1888 active++; 1889 break; 1890 } 1891 } 1892 1893 rcu_read_unlock(); 1894 1895 return active; 1896 } 1897 1898 1899 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata, 1900 struct ieee80211_if_sta *ifsta) 1901 { 1902 mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL); 1903 1904 ieee80211_sta_expire(sdata, IEEE80211_IBSS_INACTIVITY_LIMIT); 1905 if (ieee80211_sta_active_ibss(sdata)) 1906 return; 1907 1908 printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other " 1909 "IBSS networks with same SSID (merge)\n", sdata->dev->name); 1910 ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len); 1911 } 1912 1913 1914 static void ieee80211_sta_timer(unsigned long data) 1915 { 1916 struct ieee80211_sub_if_data *sdata = 1917 (struct ieee80211_sub_if_data *) data; 1918 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 1919 struct ieee80211_local *local = sdata->local; 1920 1921 set_bit(IEEE80211_STA_REQ_RUN, &ifsta->request); 1922 queue_work(local->hw.workqueue, &ifsta->work); 1923 } 1924 1925 static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata, 1926 struct ieee80211_if_sta *ifsta) 1927 { 1928 struct ieee80211_local *local = sdata->local; 1929 1930 if (local->ops->reset_tsf) { 1931 /* Reset own TSF to allow time synchronization work. */ 1932 local->ops->reset_tsf(local_to_hw(local)); 1933 } 1934 1935 ifsta->wmm_last_param_set = -1; /* allow any WMM update */ 1936 1937 1938 if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN) 1939 ifsta->auth_alg = WLAN_AUTH_OPEN; 1940 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY) 1941 ifsta->auth_alg = WLAN_AUTH_SHARED_KEY; 1942 else if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP) 1943 ifsta->auth_alg = WLAN_AUTH_LEAP; 1944 else 1945 ifsta->auth_alg = WLAN_AUTH_OPEN; 1946 ifsta->auth_transaction = -1; 1947 ifsta->flags &= ~IEEE80211_STA_ASSOCIATED; 1948 ifsta->assoc_scan_tries = 0; 1949 ifsta->direct_probe_tries = 0; 1950 ifsta->auth_tries = 0; 1951 ifsta->assoc_tries = 0; 1952 netif_tx_stop_all_queues(sdata->dev); 1953 netif_carrier_off(sdata->dev); 1954 } 1955 1956 1957 static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta, 1958 const char *ssid, int ssid_len) 1959 { 1960 int tmp, hidden_ssid; 1961 1962 if (ssid_len == ifsta->ssid_len && 1963 !memcmp(ifsta->ssid, ssid, ssid_len)) 1964 return 1; 1965 1966 if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) 1967 return 0; 1968 1969 hidden_ssid = 1; 1970 tmp = ssid_len; 1971 while (tmp--) { 1972 if (ssid[tmp] != '\0') { 1973 hidden_ssid = 0; 1974 break; 1975 } 1976 } 1977 1978 if (hidden_ssid && ifsta->ssid_len == ssid_len) 1979 return 1; 1980 1981 if (ssid_len == 1 && ssid[0] == ' ') 1982 return 1; 1983 1984 return 0; 1985 } 1986 1987 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata, 1988 struct ieee80211_if_sta *ifsta) 1989 { 1990 struct ieee80211_local *local = sdata->local; 1991 struct ieee80211_bss *bss; 1992 struct ieee80211_supported_band *sband; 1993 u8 bssid[ETH_ALEN], *pos; 1994 int i; 1995 int ret; 1996 DECLARE_MAC_BUF(mac); 1997 1998 #if 0 1999 /* Easier testing, use fixed BSSID. */ 2000 memset(bssid, 0xfe, ETH_ALEN); 2001 #else 2002 /* Generate random, not broadcast, locally administered BSSID. Mix in 2003 * own MAC address to make sure that devices that do not have proper 2004 * random number generator get different BSSID. */ 2005 get_random_bytes(bssid, ETH_ALEN); 2006 for (i = 0; i < ETH_ALEN; i++) 2007 bssid[i] ^= sdata->dev->dev_addr[i]; 2008 bssid[0] &= ~0x01; 2009 bssid[0] |= 0x02; 2010 #endif 2011 2012 printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %s\n", 2013 sdata->dev->name, print_mac(mac, bssid)); 2014 2015 bss = ieee80211_rx_bss_add(local, bssid, 2016 local->hw.conf.channel->center_freq, 2017 sdata->u.sta.ssid, sdata->u.sta.ssid_len); 2018 if (!bss) 2019 return -ENOMEM; 2020 2021 bss->band = local->hw.conf.channel->band; 2022 sband = local->hw.wiphy->bands[bss->band]; 2023 2024 if (local->hw.conf.beacon_int == 0) 2025 local->hw.conf.beacon_int = 100; 2026 bss->beacon_int = local->hw.conf.beacon_int; 2027 bss->last_update = jiffies; 2028 bss->capability = WLAN_CAPABILITY_IBSS; 2029 2030 if (sdata->default_key) 2031 bss->capability |= WLAN_CAPABILITY_PRIVACY; 2032 else 2033 sdata->drop_unencrypted = 0; 2034 2035 bss->supp_rates_len = sband->n_bitrates; 2036 pos = bss->supp_rates; 2037 for (i = 0; i < sband->n_bitrates; i++) { 2038 int rate = sband->bitrates[i].bitrate; 2039 *pos++ = (u8) (rate / 5); 2040 } 2041 2042 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss); 2043 ieee80211_rx_bss_put(local, bss); 2044 return ret; 2045 } 2046 2047 2048 static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata, 2049 struct ieee80211_if_sta *ifsta) 2050 { 2051 struct ieee80211_local *local = sdata->local; 2052 struct ieee80211_bss *bss; 2053 int found = 0; 2054 u8 bssid[ETH_ALEN]; 2055 int active_ibss; 2056 DECLARE_MAC_BUF(mac); 2057 DECLARE_MAC_BUF(mac2); 2058 2059 if (ifsta->ssid_len == 0) 2060 return -EINVAL; 2061 2062 active_ibss = ieee80211_sta_active_ibss(sdata); 2063 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2064 printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n", 2065 sdata->dev->name, active_ibss); 2066 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2067 spin_lock_bh(&local->bss_lock); 2068 list_for_each_entry(bss, &local->bss_list, list) { 2069 if (ifsta->ssid_len != bss->ssid_len || 2070 memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0 2071 || !(bss->capability & WLAN_CAPABILITY_IBSS)) 2072 continue; 2073 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2074 printk(KERN_DEBUG " bssid=%s found\n", 2075 print_mac(mac, bss->bssid)); 2076 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2077 memcpy(bssid, bss->bssid, ETH_ALEN); 2078 found = 1; 2079 if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0) 2080 break; 2081 } 2082 spin_unlock_bh(&local->bss_lock); 2083 2084 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2085 if (found) 2086 printk(KERN_DEBUG " sta_find_ibss: selected %s current " 2087 "%s\n", print_mac(mac, bssid), 2088 print_mac(mac2, ifsta->bssid)); 2089 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2090 2091 if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) { 2092 int ret; 2093 int search_freq; 2094 2095 if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) 2096 search_freq = bss->freq; 2097 else 2098 search_freq = local->hw.conf.channel->center_freq; 2099 2100 bss = ieee80211_rx_bss_get(local, bssid, search_freq, 2101 ifsta->ssid, ifsta->ssid_len); 2102 if (!bss) 2103 goto dont_join; 2104 2105 printk(KERN_DEBUG "%s: Selected IBSS BSSID %s" 2106 " based on configured SSID\n", 2107 sdata->dev->name, print_mac(mac, bssid)); 2108 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss); 2109 ieee80211_rx_bss_put(local, bss); 2110 return ret; 2111 } 2112 2113 dont_join: 2114 #ifdef CONFIG_MAC80211_IBSS_DEBUG 2115 printk(KERN_DEBUG " did not try to join ibss\n"); 2116 #endif /* CONFIG_MAC80211_IBSS_DEBUG */ 2117 2118 /* Selected IBSS not found in current scan results - try to scan */ 2119 if (ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED && 2120 !ieee80211_sta_active_ibss(sdata)) { 2121 mod_timer(&ifsta->timer, jiffies + 2122 IEEE80211_IBSS_MERGE_INTERVAL); 2123 } else if (time_after(jiffies, local->last_scan_completed + 2124 IEEE80211_SCAN_INTERVAL)) { 2125 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to " 2126 "join\n", sdata->dev->name); 2127 return ieee80211_request_scan(sdata, ifsta->ssid, 2128 ifsta->ssid_len); 2129 } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) { 2130 int interval = IEEE80211_SCAN_INTERVAL; 2131 2132 if (time_after(jiffies, ifsta->ibss_join_req + 2133 IEEE80211_IBSS_JOIN_TIMEOUT)) { 2134 if ((ifsta->flags & IEEE80211_STA_CREATE_IBSS) && 2135 (!(local->oper_channel->flags & 2136 IEEE80211_CHAN_NO_IBSS))) 2137 return ieee80211_sta_create_ibss(sdata, ifsta); 2138 if (ifsta->flags & IEEE80211_STA_CREATE_IBSS) { 2139 printk(KERN_DEBUG "%s: IBSS not allowed on" 2140 " %d MHz\n", sdata->dev->name, 2141 local->hw.conf.channel->center_freq); 2142 } 2143 2144 /* No IBSS found - decrease scan interval and continue 2145 * scanning. */ 2146 interval = IEEE80211_SCAN_INTERVAL_SLOW; 2147 } 2148 2149 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH; 2150 mod_timer(&ifsta->timer, jiffies + interval); 2151 return 0; 2152 } 2153 2154 return 0; 2155 } 2156 2157 2158 static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata, 2159 struct ieee80211_if_sta *ifsta) 2160 { 2161 struct ieee80211_local *local = sdata->local; 2162 struct ieee80211_bss *bss, *selected = NULL; 2163 int top_rssi = 0, freq; 2164 2165 spin_lock_bh(&local->bss_lock); 2166 freq = local->oper_channel->center_freq; 2167 list_for_each_entry(bss, &local->bss_list, list) { 2168 if (!(bss->capability & WLAN_CAPABILITY_ESS)) 2169 continue; 2170 2171 if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL | 2172 IEEE80211_STA_AUTO_BSSID_SEL | 2173 IEEE80211_STA_AUTO_CHANNEL_SEL)) && 2174 (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^ 2175 !!sdata->default_key)) 2176 continue; 2177 2178 if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) && 2179 bss->freq != freq) 2180 continue; 2181 2182 if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) && 2183 memcmp(bss->bssid, ifsta->bssid, ETH_ALEN)) 2184 continue; 2185 2186 if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) && 2187 !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len)) 2188 continue; 2189 2190 if (!selected || top_rssi < bss->signal) { 2191 selected = bss; 2192 top_rssi = bss->signal; 2193 } 2194 } 2195 if (selected) 2196 atomic_inc(&selected->users); 2197 spin_unlock_bh(&local->bss_lock); 2198 2199 if (selected) { 2200 ieee80211_set_freq(sdata, selected->freq); 2201 if (!(ifsta->flags & IEEE80211_STA_SSID_SET)) 2202 ieee80211_sta_set_ssid(sdata, selected->ssid, 2203 selected->ssid_len); 2204 ieee80211_sta_set_bssid(sdata, selected->bssid); 2205 ieee80211_sta_def_wmm_params(sdata, selected); 2206 2207 /* Send out direct probe if no probe resp was received or 2208 * the one we have is outdated 2209 */ 2210 if (!selected->last_probe_resp || 2211 time_after(jiffies, selected->last_probe_resp 2212 + IEEE80211_SCAN_RESULT_EXPIRE)) 2213 ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE; 2214 else 2215 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; 2216 2217 ieee80211_rx_bss_put(local, selected); 2218 ieee80211_sta_reset_auth(sdata, ifsta); 2219 return 0; 2220 } else { 2221 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) { 2222 ifsta->assoc_scan_tries++; 2223 if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) 2224 ieee80211_start_scan(sdata, NULL, 0); 2225 else 2226 ieee80211_start_scan(sdata, ifsta->ssid, 2227 ifsta->ssid_len); 2228 ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE; 2229 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request); 2230 } else 2231 ifsta->state = IEEE80211_STA_MLME_DISABLED; 2232 } 2233 return -1; 2234 } 2235 2236 2237 static void ieee80211_sta_work(struct work_struct *work) 2238 { 2239 struct ieee80211_sub_if_data *sdata = 2240 container_of(work, struct ieee80211_sub_if_data, u.sta.work); 2241 struct ieee80211_local *local = sdata->local; 2242 struct ieee80211_if_sta *ifsta; 2243 struct sk_buff *skb; 2244 2245 if (!netif_running(sdata->dev)) 2246 return; 2247 2248 if (local->sw_scanning || local->hw_scanning) 2249 return; 2250 2251 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION && 2252 sdata->vif.type != NL80211_IFTYPE_ADHOC)) 2253 return; 2254 ifsta = &sdata->u.sta; 2255 2256 while ((skb = skb_dequeue(&ifsta->skb_queue))) 2257 ieee80211_sta_rx_queued_mgmt(sdata, skb); 2258 2259 if (ifsta->state != IEEE80211_STA_MLME_DIRECT_PROBE && 2260 ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE && 2261 ifsta->state != IEEE80211_STA_MLME_ASSOCIATE && 2262 test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) { 2263 ieee80211_start_scan(sdata, ifsta->scan_ssid, 2264 ifsta->scan_ssid_len); 2265 return; 2266 } 2267 2268 if (test_and_clear_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request)) { 2269 if (ieee80211_sta_config_auth(sdata, ifsta)) 2270 return; 2271 clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request); 2272 } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifsta->request)) 2273 return; 2274 2275 switch (ifsta->state) { 2276 case IEEE80211_STA_MLME_DISABLED: 2277 break; 2278 case IEEE80211_STA_MLME_DIRECT_PROBE: 2279 ieee80211_direct_probe(sdata, ifsta); 2280 break; 2281 case IEEE80211_STA_MLME_AUTHENTICATE: 2282 ieee80211_authenticate(sdata, ifsta); 2283 break; 2284 case IEEE80211_STA_MLME_ASSOCIATE: 2285 ieee80211_associate(sdata, ifsta); 2286 break; 2287 case IEEE80211_STA_MLME_ASSOCIATED: 2288 ieee80211_associated(sdata, ifsta); 2289 break; 2290 case IEEE80211_STA_MLME_IBSS_SEARCH: 2291 ieee80211_sta_find_ibss(sdata, ifsta); 2292 break; 2293 case IEEE80211_STA_MLME_IBSS_JOINED: 2294 ieee80211_sta_merge_ibss(sdata, ifsta); 2295 break; 2296 default: 2297 WARN_ON(1); 2298 break; 2299 } 2300 2301 if (ieee80211_privacy_mismatch(sdata, ifsta)) { 2302 printk(KERN_DEBUG "%s: privacy configuration mismatch and " 2303 "mixed-cell disabled - disassociate\n", sdata->dev->name); 2304 2305 ieee80211_set_disassoc(sdata, ifsta, false, true, 2306 WLAN_REASON_UNSPECIFIED); 2307 } 2308 } 2309 2310 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata) 2311 { 2312 if (sdata->vif.type == NL80211_IFTYPE_STATION) 2313 queue_work(sdata->local->hw.workqueue, 2314 &sdata->u.sta.work); 2315 } 2316 2317 /* interface setup */ 2318 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata) 2319 { 2320 struct ieee80211_if_sta *ifsta; 2321 2322 ifsta = &sdata->u.sta; 2323 INIT_WORK(&ifsta->work, ieee80211_sta_work); 2324 setup_timer(&ifsta->timer, ieee80211_sta_timer, 2325 (unsigned long) sdata); 2326 skb_queue_head_init(&ifsta->skb_queue); 2327 2328 ifsta->capab = WLAN_CAPABILITY_ESS; 2329 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN | 2330 IEEE80211_AUTH_ALG_SHARED_KEY; 2331 ifsta->flags |= IEEE80211_STA_CREATE_IBSS | 2332 IEEE80211_STA_AUTO_BSSID_SEL | 2333 IEEE80211_STA_AUTO_CHANNEL_SEL; 2334 if (ieee80211_num_regular_queues(&sdata->local->hw) >= 4) 2335 ifsta->flags |= IEEE80211_STA_WMM_ENABLED; 2336 } 2337 2338 /* 2339 * Add a new IBSS station, will also be called by the RX code when, 2340 * in IBSS mode, receiving a frame from a yet-unknown station, hence 2341 * must be callable in atomic context. 2342 */ 2343 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, 2344 struct sk_buff *skb, u8 *bssid, 2345 u8 *addr, u64 supp_rates) 2346 { 2347 struct ieee80211_local *local = sdata->local; 2348 struct sta_info *sta; 2349 DECLARE_MAC_BUF(mac); 2350 int band = local->hw.conf.channel->band; 2351 2352 /* TODO: Could consider removing the least recently used entry and 2353 * allow new one to be added. */ 2354 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 2355 if (net_ratelimit()) { 2356 printk(KERN_DEBUG "%s: No room for a new IBSS STA " 2357 "entry %s\n", sdata->dev->name, print_mac(mac, addr)); 2358 } 2359 return NULL; 2360 } 2361 2362 if (compare_ether_addr(bssid, sdata->u.sta.bssid)) 2363 return NULL; 2364 2365 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2366 printk(KERN_DEBUG "%s: Adding new IBSS station %s (dev=%s)\n", 2367 wiphy_name(local->hw.wiphy), print_mac(mac, addr), sdata->dev->name); 2368 #endif 2369 2370 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 2371 if (!sta) 2372 return NULL; 2373 2374 set_sta_flags(sta, WLAN_STA_AUTHORIZED); 2375 2376 /* make sure mandatory rates are always added */ 2377 sta->sta.supp_rates[band] = supp_rates | 2378 ieee80211_mandatory_rates(local, band); 2379 2380 rate_control_rate_init(sta); 2381 2382 if (sta_info_insert(sta)) 2383 return NULL; 2384 2385 return sta; 2386 } 2387 2388 /* configuration hooks */ 2389 void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata, 2390 struct ieee80211_if_sta *ifsta) 2391 { 2392 struct ieee80211_local *local = sdata->local; 2393 2394 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2395 return; 2396 2397 if ((ifsta->flags & (IEEE80211_STA_BSSID_SET | 2398 IEEE80211_STA_AUTO_BSSID_SEL)) && 2399 (ifsta->flags & (IEEE80211_STA_SSID_SET | 2400 IEEE80211_STA_AUTO_SSID_SEL))) { 2401 2402 if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) 2403 ieee80211_set_disassoc(sdata, ifsta, true, true, 2404 WLAN_REASON_DEAUTH_LEAVING); 2405 2406 set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request); 2407 queue_work(local->hw.workqueue, &ifsta->work); 2408 } 2409 } 2410 2411 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len) 2412 { 2413 struct ieee80211_if_sta *ifsta; 2414 int res; 2415 2416 if (len > IEEE80211_MAX_SSID_LEN) 2417 return -EINVAL; 2418 2419 ifsta = &sdata->u.sta; 2420 2421 if (ifsta->ssid_len != len || memcmp(ifsta->ssid, ssid, len) != 0) { 2422 memset(ifsta->ssid, 0, sizeof(ifsta->ssid)); 2423 memcpy(ifsta->ssid, ssid, len); 2424 ifsta->ssid_len = len; 2425 ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET; 2426 2427 res = 0; 2428 /* 2429 * Hack! MLME code needs to be cleaned up to have different 2430 * entry points for configuration and internal selection change 2431 */ 2432 if (netif_running(sdata->dev)) 2433 res = ieee80211_if_config(sdata, IEEE80211_IFCC_SSID); 2434 if (res) { 2435 printk(KERN_DEBUG "%s: Failed to config new SSID to " 2436 "the low-level driver\n", sdata->dev->name); 2437 return res; 2438 } 2439 } 2440 2441 if (len) 2442 ifsta->flags |= IEEE80211_STA_SSID_SET; 2443 else 2444 ifsta->flags &= ~IEEE80211_STA_SSID_SET; 2445 2446 if (sdata->vif.type == NL80211_IFTYPE_ADHOC && 2447 !(ifsta->flags & IEEE80211_STA_BSSID_SET)) { 2448 ifsta->ibss_join_req = jiffies; 2449 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH; 2450 return ieee80211_sta_find_ibss(sdata, ifsta); 2451 } 2452 2453 return 0; 2454 } 2455 2456 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len) 2457 { 2458 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2459 memcpy(ssid, ifsta->ssid, ifsta->ssid_len); 2460 *len = ifsta->ssid_len; 2461 return 0; 2462 } 2463 2464 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid) 2465 { 2466 struct ieee80211_if_sta *ifsta; 2467 int res; 2468 2469 ifsta = &sdata->u.sta; 2470 2471 if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) { 2472 memcpy(ifsta->bssid, bssid, ETH_ALEN); 2473 res = 0; 2474 /* 2475 * Hack! See also ieee80211_sta_set_ssid. 2476 */ 2477 if (netif_running(sdata->dev)) 2478 res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID); 2479 if (res) { 2480 printk(KERN_DEBUG "%s: Failed to config new BSSID to " 2481 "the low-level driver\n", sdata->dev->name); 2482 return res; 2483 } 2484 } 2485 2486 if (is_valid_ether_addr(bssid)) 2487 ifsta->flags |= IEEE80211_STA_BSSID_SET; 2488 else 2489 ifsta->flags &= ~IEEE80211_STA_BSSID_SET; 2490 2491 return 0; 2492 } 2493 2494 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len) 2495 { 2496 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2497 2498 kfree(ifsta->extra_ie); 2499 if (len == 0) { 2500 ifsta->extra_ie = NULL; 2501 ifsta->extra_ie_len = 0; 2502 return 0; 2503 } 2504 ifsta->extra_ie = kmalloc(len, GFP_KERNEL); 2505 if (!ifsta->extra_ie) { 2506 ifsta->extra_ie_len = 0; 2507 return -ENOMEM; 2508 } 2509 memcpy(ifsta->extra_ie, ie, len); 2510 ifsta->extra_ie_len = len; 2511 return 0; 2512 } 2513 2514 int ieee80211_sta_deauthenticate(struct ieee80211_sub_if_data *sdata, u16 reason) 2515 { 2516 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2517 2518 printk(KERN_DEBUG "%s: deauthenticating by local choice (reason=%d)\n", 2519 sdata->dev->name, reason); 2520 2521 if (sdata->vif.type != NL80211_IFTYPE_STATION && 2522 sdata->vif.type != NL80211_IFTYPE_ADHOC) 2523 return -EINVAL; 2524 2525 ieee80211_set_disassoc(sdata, ifsta, true, true, reason); 2526 return 0; 2527 } 2528 2529 int ieee80211_sta_disassociate(struct ieee80211_sub_if_data *sdata, u16 reason) 2530 { 2531 struct ieee80211_if_sta *ifsta = &sdata->u.sta; 2532 2533 printk(KERN_DEBUG "%s: disassociating by local choice (reason=%d)\n", 2534 sdata->dev->name, reason); 2535 2536 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2537 return -EINVAL; 2538 2539 if (!(ifsta->flags & IEEE80211_STA_ASSOCIATED)) 2540 return -1; 2541 2542 ieee80211_set_disassoc(sdata, ifsta, false, true, reason); 2543 return 0; 2544 } 2545 2546 /* scan finished notification */ 2547 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local) 2548 { 2549 struct ieee80211_sub_if_data *sdata = local->scan_sdata; 2550 struct ieee80211_if_sta *ifsta; 2551 2552 if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2553 ifsta = &sdata->u.sta; 2554 if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) || 2555 (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) && 2556 !ieee80211_sta_active_ibss(sdata))) 2557 ieee80211_sta_find_ibss(sdata, ifsta); 2558 } 2559 2560 /* Restart STA timers */ 2561 rcu_read_lock(); 2562 list_for_each_entry_rcu(sdata, &local->interfaces, list) 2563 ieee80211_restart_sta_timer(sdata); 2564 rcu_read_unlock(); 2565 } 2566 2567 /* driver notification call */ 2568 void ieee80211_notify_mac(struct ieee80211_hw *hw, 2569 enum ieee80211_notification_types notif_type) 2570 { 2571 struct ieee80211_local *local = hw_to_local(hw); 2572 struct ieee80211_sub_if_data *sdata; 2573 2574 switch (notif_type) { 2575 case IEEE80211_NOTIFY_RE_ASSOC: 2576 rcu_read_lock(); 2577 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 2578 if (sdata->vif.type != NL80211_IFTYPE_STATION) 2579 continue; 2580 2581 ieee80211_sta_req_auth(sdata, &sdata->u.sta); 2582 } 2583 rcu_read_unlock(); 2584 break; 2585 } 2586 } 2587 EXPORT_SYMBOL(ieee80211_notify_mac); 2588