1 /* 2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* 7 * Copyright (c) 2001 Atsushi Onoe 8 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * Alternatively, this software may be distributed under the terms of the 23 * GNU General Public License ("GPL") version 2 as published by the Free 24 * Software Foundation. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #pragma ident "%Z%%M% %I% %E% SMI" 39 40 /* 41 * Process received frame 42 */ 43 44 #include <sys/byteorder.h> 45 #include "net80211_impl.h" 46 47 static mblk_t *ieee80211_defrag(ieee80211com_t *, ieee80211_node_t *, 48 mblk_t *, int); 49 50 /* 51 * Process a received frame. The node associated with the sender 52 * should be supplied. If nothing was found in the node table then 53 * the caller is assumed to supply a reference to ic_bss instead. 54 * The RSSI and a timestamp are also supplied. The RSSI data is used 55 * during AP scanning to select a AP to associate with; it can have 56 * any units so long as values have consistent units and higher values 57 * mean ``better signal''. The receive timestamp is currently not used 58 * by the 802.11 layer. 59 */ 60 int 61 ieee80211_input(ieee80211com_t *ic, mblk_t *mp, struct ieee80211_node *in, 62 int32_t rssi, uint32_t rstamp) 63 { 64 struct ieee80211_frame *wh; 65 struct ieee80211_key *key; 66 uint8_t *bssid; 67 int hdrspace; 68 int len; 69 uint16_t rxseq; 70 uint8_t dir; 71 uint8_t type; 72 uint8_t subtype; 73 uint8_t tid; 74 75 ASSERT(in != NULL); 76 type = (uint8_t)-1; /* undefined */ 77 len = mp->b_wptr - mp->b_rptr; 78 if (len < sizeof (struct ieee80211_frame_min)) { 79 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_input: " 80 "too short (1): len %u", len); 81 goto out; 82 } 83 /* 84 * Bit of a cheat here, we use a pointer for a 3-address 85 * frame format but don't reference fields past outside 86 * ieee80211_frame_min w/o first validating the data is 87 * present. 88 */ 89 wh = (struct ieee80211_frame *)mp->b_rptr; 90 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 91 IEEE80211_FC0_VERSION_0) { 92 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_input: " 93 "discard pkt with wrong version %x", wh->i_fc[0]); 94 goto out; 95 } 96 97 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 98 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 99 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 100 101 IEEE80211_LOCK(ic); 102 if (!(ic->ic_flags & IEEE80211_F_SCAN)) { 103 switch (ic->ic_opmode) { 104 case IEEE80211_M_STA: 105 bssid = wh->i_addr2; 106 if (!IEEE80211_ADDR_EQ(bssid, in->in_bssid)) 107 goto out_exit_mutex; 108 break; 109 case IEEE80211_M_IBSS: 110 case IEEE80211_M_AHDEMO: 111 if (dir != IEEE80211_FC1_DIR_NODS) { 112 bssid = wh->i_addr1; 113 } else if (type == IEEE80211_FC0_TYPE_CTL) { 114 bssid = wh->i_addr1; 115 } else { 116 if (len < sizeof (struct ieee80211_frame)) { 117 ieee80211_dbg(IEEE80211_MSG_ANY, 118 "ieee80211_input: too short(2):" 119 "len %u\n", len); 120 goto out_exit_mutex; 121 } 122 bssid = wh->i_addr3; 123 } 124 if (type != IEEE80211_FC0_TYPE_DATA) 125 break; 126 /* 127 * Data frame, validate the bssid. 128 */ 129 if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->in_bssid) && 130 !IEEE80211_ADDR_EQ(bssid, wifi_bcastaddr)) { 131 /* not interested in */ 132 ieee80211_dbg(IEEE80211_MSG_INPUT, 133 "ieee80211_input: not to bss %s\n", 134 ieee80211_macaddr_sprintf(bssid)); 135 goto out_exit_mutex; 136 } 137 /* 138 * For adhoc mode we cons up a node when it doesn't 139 * exist. This should probably done after an ACL check. 140 */ 141 if (in == ic->ic_bss && 142 ic->ic_opmode != IEEE80211_M_HOSTAP && 143 !IEEE80211_ADDR_EQ(wh->i_addr2, in->in_macaddr)) { 144 /* 145 * Fake up a node for this newly 146 * discovered member of the IBSS. 147 */ 148 in = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 149 wh->i_addr2); 150 if (in == NULL) { 151 /* NB: stat kept for alloc failure */ 152 goto out_exit_mutex; 153 } 154 } 155 break; 156 default: 157 goto out_exit_mutex; 158 } 159 in->in_rssi = (uint8_t)rssi; 160 in->in_rstamp = rstamp; 161 if (!(type & IEEE80211_FC0_TYPE_CTL)) { 162 tid = 0; 163 rxseq = (*(uint16_t *)wh->i_seq); 164 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 165 (rxseq - in->in_rxseqs[tid]) <= 0) { 166 /* duplicate, discard */ 167 ieee80211_dbg(IEEE80211_MSG_INPUT, 168 "ieee80211_input: duplicate", 169 "seqno <%u,%u> fragno <%u,%u> tid %u", 170 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 171 in->in_rxseqs[tid] >> 172 IEEE80211_SEQ_SEQ_SHIFT, 173 rxseq & IEEE80211_SEQ_FRAG_MASK, 174 in->in_rxseqs[tid] & 175 IEEE80211_SEQ_FRAG_MASK, 176 tid); 177 ic->ic_stats.is_rx_dups++; 178 goto out_exit_mutex; 179 } 180 in->in_rxseqs[tid] = rxseq; 181 } 182 in->in_inact = 0; 183 } 184 185 hdrspace = ieee80211_hdrspace(wh); 186 switch (type) { 187 case IEEE80211_FC0_TYPE_DATA: 188 if (len < hdrspace) { 189 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_input: " 190 "data too short: expecting %u", hdrspace); 191 goto out_exit_mutex; 192 } 193 switch (ic->ic_opmode) { 194 case IEEE80211_M_STA: 195 if (dir != IEEE80211_FC1_DIR_FROMDS) { 196 ieee80211_dbg(IEEE80211_MSG_INPUT, 197 "ieee80211_input: data ", 198 "unknown dir 0x%x", dir); 199 goto out_exit_mutex; 200 } 201 if (IEEE80211_IS_MULTICAST(wh->i_addr1) && 202 IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_macaddr)) { 203 /* 204 * In IEEE802.11 network, multicast packet 205 * sent from me is broadcasted from AP. 206 * It should be silently discarded for 207 * SIMPLEX interface. 208 */ 209 ieee80211_dbg(IEEE80211_MSG_INPUT, 210 "ieee80211_input: multicast echo\n"); 211 goto out_exit_mutex; 212 } 213 break; 214 case IEEE80211_M_IBSS: 215 case IEEE80211_M_AHDEMO: 216 if (dir != IEEE80211_FC1_DIR_NODS) { 217 ieee80211_dbg(IEEE80211_MSG_INPUT, 218 "ieee80211_input: unknown dir 0x%x", 219 dir); 220 goto out_exit_mutex; 221 } 222 break; 223 default: 224 ieee80211_err("ieee80211_input: " 225 "receive data, unknown opmode %u, skip\n", 226 ic->ic_opmode); 227 goto out_exit_mutex; 228 } 229 230 /* 231 * Handle privacy requirements. 232 */ 233 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 234 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 235 /* 236 * Discard encrypted frames when privacy off. 237 */ 238 ieee80211_dbg(IEEE80211_MSG_INPUT, 239 "ieee80211_input: ""WEP PRIVACY off"); 240 ic->ic_stats.is_wep_errors++; 241 goto out_exit_mutex; 242 } 243 key = ieee80211_crypto_decap(ic, mp, hdrspace); 244 if (key == NULL) { 245 /* NB: stats+msgs handled in crypto_decap */ 246 ic->ic_stats.is_wep_errors++; 247 goto out_exit_mutex; 248 } 249 wh = (struct ieee80211_frame *)mp->b_rptr; 250 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 251 } else { 252 key = NULL; 253 } 254 255 /* 256 * Next up, any fragmentation 257 */ 258 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 259 mp = ieee80211_defrag(ic, in, mp, hdrspace); 260 if (mp == NULL) { 261 /* Fragment dropped or frame not complete yet */ 262 goto out_exit_mutex; 263 } 264 } 265 wh = NULL; /* no longer valid, catch any uses */ 266 267 /* 268 * Next strip any MSDU crypto bits. 269 */ 270 if (key != NULL && !ieee80211_crypto_demic(ic, key, mp, 0)) { 271 ieee80211_dbg(IEEE80211_MSG_INPUT, "ieee80211_input: " 272 "data demic error\n"); 273 goto out_exit_mutex; 274 } 275 276 ic->ic_stats.is_rx_frags++; 277 ic->ic_stats.is_rx_bytes += len; 278 IEEE80211_UNLOCK(ic); 279 mac_rx(ic->ic_mach, NULL, mp); 280 return (IEEE80211_FC0_TYPE_DATA); 281 282 case IEEE80211_FC0_TYPE_MGT: 283 if (dir != IEEE80211_FC1_DIR_NODS) 284 goto out_exit_mutex; 285 if (len < sizeof (struct ieee80211_frame)) 286 goto out_exit_mutex; 287 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 288 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 289 /* 290 * Only shared key auth frames with a challenge 291 * should be encrypted, discard all others. 292 */ 293 ieee80211_dbg(IEEE80211_MSG_INPUT, 294 "ieee80211_input: " 295 "%s WEP set but not permitted", 296 IEEE80211_SUBTYPE_NAME(subtype)); 297 ic->ic_stats.is_wep_errors++; 298 goto out_exit_mutex; 299 } 300 if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { 301 /* 302 * Discard encrypted frames when privacy off. 303 */ 304 ieee80211_dbg(IEEE80211_MSG_INPUT, 305 "ieee80211_input: " 306 "mgt WEP set but PRIVACY off"); 307 ic->ic_stats.is_wep_errors++; 308 goto out_exit_mutex; 309 } 310 key = ieee80211_crypto_decap(ic, mp, hdrspace); 311 if (key == NULL) { 312 /* NB: stats+msgs handled in crypto_decap */ 313 goto out_exit_mutex; 314 } 315 wh = (struct ieee80211_frame *)mp->b_rptr; 316 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 317 } 318 IEEE80211_UNLOCK(ic); 319 ic->ic_recv_mgmt(ic, mp, in, subtype, rssi, rstamp); 320 goto out; 321 322 case IEEE80211_FC0_TYPE_CTL: 323 default: 324 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_input: " 325 "bad frame type 0x%x", type); 326 /* should not come here */ 327 break; 328 } 329 out_exit_mutex: 330 IEEE80211_UNLOCK(ic); 331 out: 332 if (mp != NULL) 333 freemsg(mp); 334 335 return (type); 336 } 337 338 /* 339 * This function reassemble fragments. 340 * More fragments bit in the frame control means the packet is fragmented. 341 * While the sequence control field consists of 4-bit fragment number 342 * field and a 12-bit sequence number field. 343 */ 344 /* ARGSUSED */ 345 static mblk_t * 346 ieee80211_defrag(ieee80211com_t *ic, struct ieee80211_node *in, mblk_t *mp, 347 int hdrspace) 348 { 349 struct ieee80211_frame *wh = (struct ieee80211_frame *)mp->b_rptr; 350 struct ieee80211_frame *lwh; 351 mblk_t *mfrag; 352 uint16_t rxseq; 353 uint8_t fragno; 354 uint8_t more_frag; 355 356 ASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1)); 357 more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 358 rxseq = LE_16(*(uint16_t *)wh->i_seq); 359 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 360 361 /* Quick way out, if there's nothing to defragment */ 362 if (!more_frag && fragno == 0 && in->in_rxfrag == NULL) 363 return (mp); 364 365 /* 366 * Remove frag to insure it doesn't get reaped by timer. 367 */ 368 if (in->in_table == NULL) { 369 /* 370 * Should never happen. If the node is orphaned (not in 371 * the table) then input packets should not reach here. 372 * Otherwise, a concurrent request that yanks the table 373 * should be blocked by other interlocking and/or by first 374 * shutting the driver down. Regardless, be defensive 375 * here and just bail 376 */ 377 freemsg(mp); 378 return (NULL); 379 } 380 IEEE80211_NODE_LOCK(in->in_table); 381 mfrag = in->in_rxfrag; 382 in->in_rxfrag = NULL; 383 IEEE80211_NODE_UNLOCK(in->in_table); 384 385 /* 386 * Validate new fragment is in order and 387 * related to the previous ones. 388 */ 389 if (mfrag != NULL) { 390 uint16_t last_rxseq; 391 392 lwh = (struct ieee80211_frame *)mfrag->b_rptr; 393 last_rxseq = LE_16(*(uint16_t *)lwh->i_seq); 394 /* 395 * Sequence control field contains 12-bit sequence no 396 * and 4-bit fragment number. For fragemnts, the 397 * sequence no is not changed. 398 * NB: check seq # and frag together 399 */ 400 if (rxseq != last_rxseq + 1 || 401 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 402 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 403 /* 404 * Unrelated fragment or no space for it, 405 * clear current fragments. 406 */ 407 freemsg(mfrag); 408 mfrag = NULL; 409 } 410 } 411 412 if (mfrag == NULL) { 413 if (fragno != 0) { /* !first fragment, discard */ 414 freemsg(mp); 415 return (NULL); 416 } 417 mfrag = mp; 418 } else { /* concatenate */ 419 (void) adjmsg(mp, hdrspace); 420 linkb(mfrag, mp); 421 /* track last seqnum and fragno */ 422 lwh = (struct ieee80211_frame *)mfrag->b_rptr; 423 *(uint16_t *)lwh->i_seq = *(uint16_t *)wh->i_seq; 424 } 425 if (more_frag != 0) { /* more to come, save */ 426 in->in_rxfragstamp = ddi_get_lbolt(); 427 in->in_rxfrag = mfrag; 428 mfrag = NULL; 429 } 430 431 return (mfrag); 432 } 433 434 /* 435 * Install received rate set information in the node's state block. 436 */ 437 int 438 ieee80211_setup_rates(struct ieee80211_node *in, const uint8_t *rates, 439 const uint8_t *xrates, int flags) 440 { 441 struct ieee80211_rateset *rs = &in->in_rates; 442 443 bzero(rs, sizeof (*rs)); 444 rs->ir_nrates = rates[1]; 445 /* skip 1 byte element ID and 1 byte length */ 446 bcopy(rates + 2, rs->ir_rates, rs->ir_nrates); 447 if (xrates != NULL) { 448 uint8_t nxrates; 449 450 /* 451 * Tack on 11g extended supported rate element. 452 */ 453 nxrates = xrates[1]; 454 if (rs->ir_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 455 nxrates = IEEE80211_RATE_MAXSIZE - rs->ir_nrates; 456 ieee80211_dbg(IEEE80211_MSG_XRATE, 457 "ieee80211_setup_rates: %s", 458 "[%s] extended rate set too large;" 459 " only using %u of %u rates\n", 460 ieee80211_macaddr_sprintf(in->in_macaddr), 461 nxrates, xrates[1]); 462 } 463 bcopy(xrates + 2, rs->ir_rates + rs->ir_nrates, nxrates); 464 rs->ir_nrates += nxrates; 465 } 466 return (ieee80211_fix_rate(in, flags)); 467 } 468 469 /* 470 * Process open-system authentication response frame and start 471 * association if the authentication request is accepted. 472 */ 473 static void 474 ieee80211_auth_open(ieee80211com_t *ic, struct ieee80211_frame *wh, 475 struct ieee80211_node *in, uint16_t seq, uint16_t status) 476 { 477 IEEE80211_LOCK_ASSERT(ic); 478 if (in->in_authmode == IEEE80211_AUTH_SHARED) { 479 ieee80211_dbg(IEEE80211_MSG_AUTH, 480 "open auth: bad sta auth mode %u", in->in_authmode); 481 return; 482 } 483 if (ic->ic_opmode == IEEE80211_M_STA) { 484 if (ic->ic_state != IEEE80211_S_AUTH || 485 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 486 return; 487 } 488 IEEE80211_UNLOCK(ic); 489 if (status != 0) { 490 ieee80211_dbg(IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 491 "open auth failed (reason %d)\n", status); 492 if (in != ic->ic_bss) 493 in->in_fails++; 494 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 495 } else { 496 /* i_fc[0] - frame control's type & subtype field */ 497 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 498 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 499 } 500 IEEE80211_LOCK(ic); 501 } else { 502 ieee80211_dbg(IEEE80211_MSG_AUTH, "ieee80211_auth_open: " 503 "bad operating mode %u", ic->ic_opmode); 504 } 505 } 506 507 /* 508 * Allocate challenge text for use by shared-key authentication 509 * Return B_TRUE on success, B_FALST otherwise. 510 */ 511 static boolean_t 512 ieee80211_alloc_challenge(struct ieee80211_node *in) 513 { 514 if (in->in_challenge == NULL) { 515 in->in_challenge = kmem_alloc(IEEE80211_CHALLENGE_LEN, 516 KM_NOSLEEP); 517 } 518 if (in->in_challenge == NULL) { 519 ieee80211_dbg(IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 520 "[%s] shared key challenge alloc failed\n", 521 ieee80211_macaddr_sprintf(in->in_macaddr)); 522 } 523 return (in->in_challenge != NULL); 524 } 525 526 /* 527 * Process shared-key authentication response frames. If authentication 528 * succeeds, start association; otherwise, restart scan. 529 */ 530 static void 531 ieee80211_auth_shared(ieee80211com_t *ic, struct ieee80211_frame *wh, 532 uint8_t *frm, uint8_t *efrm, struct ieee80211_node *in, uint16_t seq, 533 uint16_t status) 534 { 535 uint8_t *challenge; 536 537 /* 538 * Pre-shared key authentication is evil; accept 539 * it only if explicitly configured (it is supported 540 * mainly for compatibility with clients like OS X). 541 */ 542 IEEE80211_LOCK_ASSERT(ic); 543 if (in->in_authmode != IEEE80211_AUTH_AUTO && 544 in->in_authmode != IEEE80211_AUTH_SHARED) { 545 ieee80211_dbg(IEEE80211_MSG_AUTH, "ieee80211_auth_shared: " 546 "bad sta auth mode %u", in->in_authmode); 547 goto bad; 548 } 549 550 challenge = NULL; 551 if (frm + 1 < efrm) { 552 /* 553 * Challenge text information element 554 * frm[0] - element ID 555 * frm[1] - length 556 * frm[2]... - challenge text 557 */ 558 if ((frm[1] + 2) > (efrm - frm)) { 559 ieee80211_dbg(IEEE80211_MSG_AUTH, 560 "ieee80211_auth_shared: ie %d%d too long\n", 561 frm[0], (frm[1] + 2) - (efrm - frm)); 562 goto bad; 563 } 564 if (*frm == IEEE80211_ELEMID_CHALLENGE) 565 challenge = frm; 566 frm += frm[1] + 2; 567 } 568 switch (seq) { 569 case IEEE80211_AUTH_SHARED_CHALLENGE: 570 case IEEE80211_AUTH_SHARED_RESPONSE: 571 if (challenge == NULL) { 572 ieee80211_dbg(IEEE80211_MSG_AUTH, 573 "ieee80211_auth_shared: no challenge\n"); 574 goto bad; 575 } 576 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 577 ieee80211_dbg(IEEE80211_MSG_AUTH, 578 "ieee80211_auth_shared: bad challenge len %d\n", 579 challenge[1]); 580 goto bad; 581 } 582 default: 583 break; 584 } 585 switch (ic->ic_opmode) { 586 case IEEE80211_M_STA: 587 if (ic->ic_state != IEEE80211_S_AUTH) 588 return; 589 switch (seq) { 590 case IEEE80211_AUTH_SHARED_PASS: 591 if (in->in_challenge != NULL) { 592 kmem_free(in->in_challenge, 593 IEEE80211_CHALLENGE_LEN); 594 in->in_challenge = NULL; 595 } 596 if (status != 0) { 597 ieee80211_dbg(IEEE80211_MSG_DEBUG | 598 IEEE80211_MSG_AUTH, 599 "shared key auth failed (reason %d)\n", 600 status); 601 if (in != ic->ic_bss) 602 in->in_fails++; 603 return; 604 } 605 IEEE80211_UNLOCK(ic); 606 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 607 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 608 IEEE80211_LOCK(ic); 609 break; 610 case IEEE80211_AUTH_SHARED_CHALLENGE: 611 if (!ieee80211_alloc_challenge(in)) 612 return; 613 bcopy(&challenge[2], in->in_challenge, challenge[1]); 614 IEEE80211_UNLOCK(ic); 615 IEEE80211_SEND_MGMT(ic, in, IEEE80211_FC0_SUBTYPE_AUTH, 616 seq + 1); 617 IEEE80211_LOCK(ic); 618 break; 619 default: 620 ieee80211_dbg(IEEE80211_MSG_AUTH, "80211_auth_shared: " 621 "shared key auth: bad seq %d", seq); 622 return; 623 } 624 break; 625 626 default: 627 ieee80211_dbg(IEEE80211_MSG_AUTH, 628 "ieee80211_auth_shared: bad opmode %u\n", 629 ic->ic_opmode); 630 break; 631 } 632 return; 633 bad: 634 if (ic->ic_opmode == IEEE80211_M_STA) { 635 /* 636 * Kick the state machine. This short-circuits 637 * using the mgt frame timeout to trigger the 638 * state transition. 639 */ 640 if (ic->ic_state == IEEE80211_S_AUTH) { 641 IEEE80211_UNLOCK(ic); 642 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 643 IEEE80211_LOCK(ic); 644 } 645 } 646 } 647 648 /* 649 * Process a beacon/probe response frame. 650 * When the device is in station mode, create a node and add it 651 * to the node database for a new ESS or update node info if it's 652 * already there. 653 */ 654 static void 655 ieee80211_recv_beacon(ieee80211com_t *ic, mblk_t *mp, struct ieee80211_node *in, 656 int subtype, int rssi, uint32_t rstamp) 657 { 658 ieee80211_impl_t *im = ic->ic_private; 659 struct ieee80211_frame *wh; 660 uint8_t *frm; 661 uint8_t *efrm; /* end of frame body */ 662 struct ieee80211_scanparams scan; 663 664 wh = (struct ieee80211_frame *)mp->b_rptr; 665 frm = (uint8_t *)&wh[1]; 666 efrm = (uint8_t *)mp->b_wptr; 667 668 /* 669 * We process beacon/probe response frames: 670 * o when scanning, or 671 * o station mode when associated (to collect state 672 * updates such as 802.11g slot time), or 673 * o adhoc mode (to discover neighbors) 674 * Frames otherwise received are discarded. 675 */ 676 if (!((ic->ic_flags & IEEE80211_F_SCAN) || 677 (ic->ic_opmode == IEEE80211_M_STA && in->in_associd != 0) || 678 ic->ic_opmode == IEEE80211_M_IBSS)) { 679 return; 680 } 681 682 /* 683 * beacon/probe response frame format 684 * [8] time stamp 685 * [2] beacon interval 686 * [2] capability information 687 * [tlv] ssid 688 * [tlv] supported rates 689 * [tlv] country information 690 * [tlv] parameter set (FH/DS) 691 * [tlv] erp information 692 * [tlv] extended supported rates 693 * [tlv] WME 694 * [tlv] WPA or RSN 695 */ 696 IEEE80211_VERIFY_LENGTH(efrm - frm, IEEE80211_BEACON_ELEM_MIN, return); 697 bzero(&scan, sizeof (scan)); 698 scan.tstamp = frm; 699 frm += 8; 700 scan.bintval = (*(uint16_t *)frm); 701 frm += 2; 702 scan.capinfo = (*(uint16_t *)frm); 703 frm += 2; 704 scan.bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 705 scan.chan = scan.bchan; 706 707 while (frm < efrm) { 708 /* Agere element in beacon */ 709 if ((*frm == IEEE80211_ELEMID_AGERE1) || 710 (*frm == IEEE80211_ELEMID_AGERE2)) { 711 frm = efrm; 712 break; 713 } 714 715 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1], return); 716 switch (*frm) { 717 case IEEE80211_ELEMID_SSID: 718 scan.ssid = frm; 719 break; 720 case IEEE80211_ELEMID_RATES: 721 scan.rates = frm; 722 break; 723 case IEEE80211_ELEMID_COUNTRY: 724 scan.country = frm; 725 break; 726 case IEEE80211_ELEMID_FHPARMS: 727 if (ic->ic_phytype == IEEE80211_T_FH) { 728 scan.fhdwell = LE_16(*(uint16_t *)(frm + 2)); 729 scan.chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 730 scan.fhindex = frm[6]; 731 scan.phytype = IEEE80211_T_FH; 732 } 733 break; 734 case IEEE80211_ELEMID_DSPARMS: 735 if (ic->ic_phytype != IEEE80211_T_FH) { 736 scan.chan = frm[2]; 737 scan.phytype = IEEE80211_T_DS; 738 } 739 break; 740 case IEEE80211_ELEMID_TIM: 741 scan.tim = frm; 742 scan.timoff = frm - mp->b_rptr; 743 break; 744 case IEEE80211_ELEMID_IBSSPARMS: 745 break; 746 case IEEE80211_ELEMID_XRATES: 747 scan.xrates = frm; 748 break; 749 case IEEE80211_ELEMID_ERP: 750 if (frm[1] != 1) { 751 ieee80211_dbg(IEEE80211_MSG_ELEMID, 752 "ieee80211_recv_mgmt: ignore %s, " 753 "invalid ERP element; " 754 "length %u, expecting 1\n", 755 IEEE80211_SUBTYPE_NAME(subtype), 756 frm[1]); 757 break; 758 } 759 scan.erp = frm[2]; 760 scan.phytype = IEEE80211_T_OFDM; 761 break; 762 case IEEE80211_ELEMID_RSN: 763 scan.wpa = frm; 764 break; 765 default: 766 ieee80211_dbg(IEEE80211_MSG_ELEMID, 767 "ieee80211_recv_mgmt: ignore %s," 768 "unhandled id %u, len %u, totallen %u", 769 IEEE80211_SUBTYPE_NAME(subtype), 770 *frm, frm[1], 771 mp->b_wptr - mp->b_rptr); 772 break; 773 } 774 /* frm[1] - component length */ 775 frm += IEEE80211_ELEM_LEN(frm[1]); 776 } 777 IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE, return); 778 IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN, return); 779 if (ieee80211_isclr(ic->ic_chan_active, scan.chan)) { 780 ieee80211_dbg(IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 781 "ieee80211_recv_mgmt: ignore %s ," 782 "invalid channel %u\n", 783 IEEE80211_SUBTYPE_NAME(subtype), scan.chan); 784 return; 785 } 786 if (scan.chan != scan.bchan && 787 ic->ic_phytype != IEEE80211_T_FH) { 788 /* 789 * Frame was received on a channel different from the 790 * one indicated in the DS params element id; 791 * silently discard it. 792 * 793 * NB: this can happen due to signal leakage. 794 * But we should take it for FH phy because 795 * the rssi value should be correct even for 796 * different hop pattern in FH. 797 */ 798 ieee80211_dbg(IEEE80211_MSG_ELEMID, 799 "ieee80211_recv_mgmt: ignore %s ," 800 "phytype %u channel %u marked for %u\n", 801 IEEE80211_SUBTYPE_NAME(subtype), 802 ic->ic_phytype, scan.bchan, scan.chan); 803 return; 804 } 805 if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && 806 scan.bintval <= IEEE80211_BINTVAL_MAX)) { 807 ieee80211_dbg(IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 808 "ieee80211_recv_mgmt: ignore %s ," 809 "bogus beacon interval %u\n", 810 IEEE80211_SUBTYPE_NAME(subtype), scan.bintval); 811 return; 812 } 813 814 /* 815 * When operating in station mode, check for state updates. 816 * Be careful to ignore beacons received while doing a 817 * background scan. We consider only 11g/WMM stuff right now. 818 */ 819 if (ic->ic_opmode == IEEE80211_M_STA && 820 in->in_associd != 0 && 821 (!(ic->ic_flags & IEEE80211_F_SCAN) || 822 IEEE80211_ADDR_EQ(wh->i_addr2, in->in_bssid))) { 823 /* record tsf of last beacon */ 824 bcopy(scan.tstamp, in->in_tstamp.data, 825 sizeof (in->in_tstamp)); 826 /* count beacon frame for s/w bmiss handling */ 827 im->im_swbmiss_count++; 828 im->im_bmiss_count = 0; 829 830 if ((in->in_capinfo ^ scan.capinfo) & 831 IEEE80211_CAPINFO_SHORT_SLOTTIME) { 832 ieee80211_dbg(IEEE80211_MSG_ASSOC, 833 "ieee80211_recv_mgmt: " 834 "[%s] cap change: before 0x%x, now 0x%x\n", 835 ieee80211_macaddr_sprintf(wh->i_addr2), 836 in->in_capinfo, scan.capinfo); 837 /* 838 * NB: we assume short preamble doesn't 839 * change dynamically 840 */ 841 ieee80211_set_shortslottime(ic, 842 ic->ic_curmode == IEEE80211_MODE_11A || 843 (scan.capinfo & 844 IEEE80211_CAPINFO_SHORT_SLOTTIME)); 845 in->in_capinfo = scan.capinfo; 846 } 847 848 if (scan.tim != NULL) { 849 struct ieee80211_tim_ie *ie; 850 851 ie = (struct ieee80211_tim_ie *)scan.tim; 852 in->in_dtim_count = ie->tim_count; 853 in->in_dtim_period = ie->tim_period; 854 } 855 if (ic->ic_flags & IEEE80211_F_SCAN) { 856 ieee80211_add_scan(ic, &scan, wh, subtype, rssi, 857 rstamp); 858 } 859 return; 860 } 861 /* 862 * If scanning, just pass information to the scan module. 863 */ 864 if (ic->ic_flags & IEEE80211_F_SCAN) { 865 ieee80211_add_scan(ic, &scan, wh, subtype, rssi, rstamp); 866 return; 867 } 868 869 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 870 if (!IEEE80211_ADDR_EQ(wh->i_addr2, in->in_macaddr)) { 871 /* 872 * Create a new entry in the neighbor table. 873 */ 874 in = ieee80211_add_neighbor(ic, wh, &scan); 875 } else if (in->in_capinfo == 0) { 876 /* 877 * Update faked node created on transmit. 878 * Note this also updates the tsf. 879 */ 880 ieee80211_init_neighbor(in, wh, &scan); 881 } else { 882 /* 883 * Record tsf for potential resync. 884 */ 885 bcopy(scan.tstamp, in->in_tstamp.data, 886 sizeof (in->in_tstamp)); 887 } 888 if (in != NULL) { 889 in->in_rssi = (uint8_t)rssi; 890 in->in_rstamp = rstamp; 891 } 892 } 893 } 894 895 /* 896 * Perform input processing for 802.11 management frames. 897 * It's the default ic_recv_mgmt callback function for the interface 898 * softc, ic. Tipically ic_recv_mgmt is called within ieee80211_input() 899 */ 900 void 901 ieee80211_recv_mgmt(ieee80211com_t *ic, mblk_t *mp, struct ieee80211_node *in, 902 int subtype, int rssi, uint32_t rstamp) 903 { 904 struct ieee80211_frame *wh; 905 uint8_t *frm; /* pointer to start of the frame */ 906 uint8_t *efrm; /* pointer to end of the frame */ 907 uint8_t *ssid; 908 uint8_t *rates; 909 uint8_t *xrates; /* extended rates */ 910 boolean_t allocbs = B_FALSE; 911 uint8_t rate; 912 uint16_t algo; /* authentication algorithm */ 913 uint16_t seq; /* sequence no */ 914 uint16_t status; 915 uint16_t capinfo; 916 uint16_t associd; /* association ID */ 917 918 IEEE80211_LOCK(ic); 919 wh = (struct ieee80211_frame *)mp->b_rptr; 920 frm = (uint8_t *)&wh[1]; 921 efrm = (uint8_t *)mp->b_wptr; 922 switch (subtype) { 923 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 924 case IEEE80211_FC0_SUBTYPE_BEACON: 925 ieee80211_recv_beacon(ic, mp, in, subtype, rssi, rstamp); 926 break; 927 928 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 929 if (ic->ic_opmode == IEEE80211_M_STA || 930 ic->ic_state != IEEE80211_S_RUN || 931 IEEE80211_IS_MULTICAST(wh->i_addr2)) { 932 break; 933 } 934 935 /* 936 * prreq frame format 937 * [tlv] ssid 938 * [tlv] supported rates 939 * [tlv] extended supported rates 940 */ 941 ssid = rates = xrates = NULL; 942 while (frm < efrm) { 943 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1], goto out); 944 switch (*frm) { 945 case IEEE80211_ELEMID_SSID: 946 ssid = frm; 947 break; 948 case IEEE80211_ELEMID_RATES: 949 rates = frm; 950 break; 951 case IEEE80211_ELEMID_XRATES: 952 xrates = frm; 953 break; 954 } 955 frm += frm[1] + 2; 956 } 957 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, break); 958 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, break); 959 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid, break); 960 if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 961 ieee80211_dbg(IEEE80211_MSG_INPUT, 962 "ieee80211_recv_mgmt: ignore %s, " 963 "no ssid with ssid suppression enabled", 964 IEEE80211_SUBTYPE_NAME(subtype)); 965 break; 966 } 967 968 if (in == ic->ic_bss) { 969 if (ic->ic_opmode != IEEE80211_M_IBSS) { 970 in = ieee80211_tmp_node(ic, wh->i_addr2); 971 allocbs = B_TRUE; 972 } else if (!IEEE80211_ADDR_EQ(wh->i_addr2, 973 in->in_macaddr)) { 974 /* 975 * Cannot tell if the sender is operating 976 * in ibss mode. But we need a new node to 977 * send the response so blindly add them to the 978 * neighbor table. 979 */ 980 in = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 981 wh->i_addr2); 982 } 983 if (in == NULL) 984 break; 985 } 986 ieee80211_dbg(IEEE80211_MSG_ASSOC, "ieee80211_recv_mgmt: " 987 "[%s] recv probe req\n", 988 ieee80211_macaddr_sprintf(wh->i_addr2)); 989 in->in_rssi = (uint8_t)rssi; 990 in->in_rstamp = rstamp; 991 /* 992 * Adjust and check station's rate list with device's 993 * supported rate. Send back response if there is at 994 * least one rate or the fixed rate(if being set) is 995 * supported by both station and the device 996 */ 997 rate = ieee80211_setup_rates(in, rates, xrates, 998 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 999 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1000 if (rate & IEEE80211_RATE_BASIC) { 1001 ieee80211_dbg(IEEE80211_MSG_XRATE, "ieee80211_recv_mgmt" 1002 "%s recv'd rate set invalid", 1003 IEEE80211_SUBTYPE_NAME(subtype)); 1004 } else { 1005 IEEE80211_UNLOCK(ic); 1006 IEEE80211_SEND_MGMT(ic, in, 1007 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 1008 IEEE80211_LOCK(ic); 1009 } 1010 if (allocbs) { 1011 /* 1012 * Temporary node created just to send a 1013 * response, reclaim immediately. 1014 */ 1015 ieee80211_free_node(in); 1016 } 1017 break; 1018 1019 case IEEE80211_FC0_SUBTYPE_AUTH: 1020 /* 1021 * auth frame format 1022 * [2] algorithm 1023 * [2] sequence 1024 * [2] status 1025 * [tlv*] challenge 1026 */ 1027 IEEE80211_VERIFY_LENGTH(efrm - frm, IEEE80211_AUTH_ELEM_MIN, 1028 break); 1029 algo = (*(uint16_t *)frm); 1030 seq = (*(uint16_t *)(frm + 2)); 1031 status = (*(uint16_t *)(frm + 4)); 1032 ieee80211_dbg(IEEE80211_MSG_AUTH, "ieee80211_recv_mgmt: " 1033 "[%s] recv auth frame with algorithm %d seq %d\n", 1034 ieee80211_macaddr_sprintf(wh->i_addr2), algo, seq); 1035 1036 if (ic->ic_flags & IEEE80211_F_COUNTERM) { 1037 ieee80211_dbg(IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1038 "ieee80211_recv_mgmt: ignore auth, %s\n", 1039 "TKIP countermeasures enabled"); 1040 break; 1041 } 1042 switch (algo) { 1043 case IEEE80211_AUTH_ALG_SHARED: 1044 ieee80211_auth_shared(ic, wh, frm + 6, efrm, in, 1045 seq, status); 1046 break; 1047 case IEEE80211_AUTH_ALG_OPEN: 1048 ieee80211_auth_open(ic, wh, in, seq, status); 1049 break; 1050 default: 1051 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_recv_mgmt: " 1052 "ignore auth, unsupported alg %d", algo); 1053 break; 1054 } 1055 break; 1056 1057 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1058 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1059 if (ic->ic_opmode != IEEE80211_M_STA || 1060 ic->ic_state != IEEE80211_S_ASSOC) 1061 break; 1062 1063 /* 1064 * asresp frame format 1065 * [2] capability information 1066 * [2] status 1067 * [2] association ID 1068 * [tlv] supported rates 1069 * [tlv] extended supported rates 1070 * [tlv] WME 1071 */ 1072 IEEE80211_VERIFY_LENGTH(efrm - frm, 1073 IEEE80211_ASSOC_RESP_ELEM_MIN, break); 1074 in = ic->ic_bss; 1075 capinfo = (*(uint16_t *)frm); 1076 frm += 2; 1077 status = (*(uint16_t *)frm); 1078 frm += 2; 1079 if (status != 0) { 1080 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1081 "assoc failed (reason %d)\n", status); 1082 in = ieee80211_find_node(&ic->ic_scan, wh->i_addr2); 1083 if (in != NULL) { 1084 in->in_fails++; 1085 ieee80211_free_node(in); 1086 } 1087 break; 1088 } 1089 associd = (*(uint16_t *)frm); 1090 frm += 2; 1091 1092 rates = xrates = NULL; 1093 while (frm < efrm) { 1094 /* 1095 * Do not discard frames containing proprietary Agere 1096 * elements 128 and 129, as the reported element length 1097 * is often wrong. Skip rest of the frame, since we can 1098 * not rely on the given element length making it 1099 * impossible to know where the next element starts 1100 */ 1101 if ((*frm == IEEE80211_ELEMID_AGERE1) || 1102 (*frm == IEEE80211_ELEMID_AGERE2)) { 1103 frm = efrm; 1104 break; 1105 } 1106 1107 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1], goto out); 1108 switch (*frm) { 1109 case IEEE80211_ELEMID_RATES: 1110 rates = frm; 1111 break; 1112 case IEEE80211_ELEMID_XRATES: 1113 xrates = frm; 1114 break; 1115 } 1116 frm += frm[1] + 2; 1117 } 1118 1119 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, break); 1120 /* 1121 * Adjust and check AP's rate list with device's 1122 * supported rate. Re-start scan if no rate is or the 1123 * fixed rate(if being set) cannot be supported by 1124 * either AP or the device. 1125 */ 1126 rate = ieee80211_setup_rates(in, rates, xrates, 1127 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1128 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1129 if (rate & IEEE80211_RATE_BASIC) { 1130 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1131 "assoc failed (rate set mismatch)\n"); 1132 if (in != ic->ic_bss) 1133 in->in_fails++; 1134 IEEE80211_UNLOCK(ic); 1135 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 1136 return; 1137 } 1138 1139 in->in_capinfo = capinfo; 1140 in->in_associd = associd; 1141 in->in_flags &= ~IEEE80211_NODE_QOS; 1142 /* 1143 * Configure state now that we are associated. 1144 */ 1145 if (ic->ic_curmode == IEEE80211_MODE_11A || 1146 (in->in_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1147 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1148 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1149 } else { 1150 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1151 ic->ic_flags |= IEEE80211_F_USEBARKER; 1152 } 1153 ieee80211_set_shortslottime(ic, 1154 ic->ic_curmode == IEEE80211_MODE_11A || 1155 (in->in_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1156 /* 1157 * Honor ERP protection. 1158 * 1159 * NB: in_erp should zero for non-11g operation. 1160 * check ic_curmode anyway 1161 */ 1162 if (ic->ic_curmode == IEEE80211_MODE_11G && 1163 (in->in_erp & IEEE80211_ERP_USE_PROTECTION)) 1164 ic->ic_flags |= IEEE80211_F_USEPROT; 1165 else 1166 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1167 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1168 "assoc success: %s preamble, %s slot time%s%s\n", 1169 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1170 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1171 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1172 in->in_flags & IEEE80211_NODE_QOS ? ", QoS" : ""); 1173 IEEE80211_UNLOCK(ic); 1174 ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); 1175 return; 1176 1177 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1178 if (ic->ic_state == IEEE80211_S_SCAN) 1179 break; 1180 1181 /* 1182 * deauth frame format 1183 * [2] reason 1184 */ 1185 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, break); 1186 status = (*(uint16_t *)frm); 1187 1188 ieee80211_dbg(IEEE80211_MSG_AUTH, 1189 "recv deauthenticate (reason %d)\n", status); 1190 switch (ic->ic_opmode) { 1191 case IEEE80211_M_STA: 1192 IEEE80211_UNLOCK(ic); 1193 ieee80211_new_state(ic, IEEE80211_S_AUTH, 1194 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1195 return; 1196 default: 1197 break; 1198 } 1199 break; 1200 1201 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1202 if (ic->ic_state != IEEE80211_S_RUN && 1203 ic->ic_state != IEEE80211_S_ASSOC && 1204 ic->ic_state != IEEE80211_S_AUTH) 1205 break; 1206 /* 1207 * disassoc frame format 1208 * [2] reason 1209 */ 1210 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, break); 1211 status = (*(uint16_t *)frm); 1212 1213 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1214 "recv disassociate (reason %d)\n", status); 1215 switch (ic->ic_opmode) { 1216 case IEEE80211_M_STA: 1217 IEEE80211_UNLOCK(ic); 1218 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1219 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1220 return; 1221 default: 1222 break; 1223 } 1224 break; 1225 1226 default: 1227 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_recv_mgmt: " 1228 "subtype 0x%x not handled\n", subtype); 1229 break; 1230 } /* switch subtype */ 1231 out: 1232 IEEE80211_UNLOCK(ic); 1233 } 1234