1 /* 2 * Copyright 2009 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) 2002-2008 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 /* 39 * Process received frame 40 */ 41 42 #include <sys/mac_provider.h> 43 #include <sys/byteorder.h> 44 #include <sys/strsun.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 in->in_inact = in->in_inact_reload; 77 type = (uint8_t)-1; /* undefined */ 78 len = MBLKL(mp); 79 if (len < sizeof (struct ieee80211_frame_min)) { 80 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_input: " 81 "too short (1): len %u", len); 82 goto out; 83 } 84 /* 85 * Bit of a cheat here, we use a pointer for a 3-address 86 * frame format but don't reference fields past outside 87 * ieee80211_frame_min w/o first validating the data is 88 * present. 89 */ 90 wh = (struct ieee80211_frame *)mp->b_rptr; 91 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 92 IEEE80211_FC0_VERSION_0) { 93 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_input: " 94 "discard pkt with wrong version %x", wh->i_fc[0]); 95 goto out; 96 } 97 98 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 99 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 100 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 101 102 IEEE80211_LOCK(ic); 103 if (!(ic->ic_flags & IEEE80211_F_SCAN)) { 104 switch (ic->ic_opmode) { 105 case IEEE80211_M_STA: 106 bssid = wh->i_addr2; 107 if (!IEEE80211_ADDR_EQ(bssid, in->in_bssid)) 108 goto out_exit_mutex; 109 break; 110 case IEEE80211_M_IBSS: 111 case IEEE80211_M_AHDEMO: 112 if (dir != IEEE80211_FC1_DIR_NODS) { 113 bssid = wh->i_addr1; 114 } else if (type == IEEE80211_FC0_TYPE_CTL) { 115 bssid = wh->i_addr1; 116 } else { 117 if (len < sizeof (struct ieee80211_frame)) { 118 ieee80211_dbg(IEEE80211_MSG_ANY, 119 "ieee80211_input: too short(2):" 120 "len %u\n", len); 121 goto out_exit_mutex; 122 } 123 bssid = wh->i_addr3; 124 } 125 if (type != IEEE80211_FC0_TYPE_DATA) 126 break; 127 /* 128 * Data frame, validate the bssid. 129 */ 130 if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->in_bssid) && 131 !IEEE80211_ADDR_EQ(bssid, wifi_bcastaddr)) { 132 /* not interested in */ 133 ieee80211_dbg(IEEE80211_MSG_INPUT, 134 "ieee80211_input: not to bss %s\n", 135 ieee80211_macaddr_sprintf(bssid)); 136 goto out_exit_mutex; 137 } 138 /* 139 * For adhoc mode we cons up a node when it doesn't 140 * exist. This should probably done after an ACL check. 141 */ 142 if (in == ic->ic_bss && 143 ic->ic_opmode != IEEE80211_M_HOSTAP && 144 !IEEE80211_ADDR_EQ(wh->i_addr2, in->in_macaddr)) { 145 /* 146 * Fake up a node for this newly 147 * discovered member of the IBSS. 148 */ 149 in = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 150 wh->i_addr2); 151 if (in == NULL) { 152 /* NB: stat kept for alloc failure */ 153 goto out_exit_mutex; 154 } 155 } 156 break; 157 default: 158 goto out_exit_mutex; 159 } 160 in->in_rssi = (uint8_t)rssi; 161 in->in_rstamp = rstamp; 162 if (!(type & IEEE80211_FC0_TYPE_CTL)) { 163 tid = 0; 164 rxseq = (*(uint16_t *)wh->i_seq); 165 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 166 (rxseq - in->in_rxseqs[tid]) <= 0) { 167 /* duplicate, discard */ 168 ieee80211_dbg(IEEE80211_MSG_INPUT, 169 "ieee80211_input: duplicate", 170 "seqno <%u,%u> fragno <%u,%u> tid %u", 171 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 172 in->in_rxseqs[tid] >> 173 IEEE80211_SEQ_SEQ_SHIFT, 174 rxseq & IEEE80211_SEQ_FRAG_MASK, 175 in->in_rxseqs[tid] & 176 IEEE80211_SEQ_FRAG_MASK, 177 tid); 178 ic->ic_stats.is_rx_dups++; 179 goto out_exit_mutex; 180 } 181 in->in_rxseqs[tid] = rxseq; 182 } 183 } 184 185 switch (type) { 186 case IEEE80211_FC0_TYPE_DATA: 187 hdrspace = ieee80211_hdrspace(wh); 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 hdrspace = ieee80211_hdrspace(wh); 311 key = ieee80211_crypto_decap(ic, mp, hdrspace); 312 if (key == NULL) { 313 /* NB: stats+msgs handled in crypto_decap */ 314 goto out_exit_mutex; 315 } 316 wh = (struct ieee80211_frame *)mp->b_rptr; 317 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 318 } 319 IEEE80211_UNLOCK(ic); 320 ic->ic_recv_mgmt(ic, mp, in, subtype, rssi, rstamp); 321 goto out; 322 323 case IEEE80211_FC0_TYPE_CTL: 324 default: 325 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_input: " 326 "bad frame type 0x%x", type); 327 /* should not come here */ 328 break; 329 } 330 out_exit_mutex: 331 IEEE80211_UNLOCK(ic); 332 out: 333 if (mp != NULL) 334 freemsg(mp); 335 336 return (type); 337 } 338 339 /* 340 * This function reassemble fragments. 341 * More fragments bit in the frame control means the packet is fragmented. 342 * While the sequence control field consists of 4-bit fragment number 343 * field and a 12-bit sequence number field. 344 */ 345 /* ARGSUSED */ 346 static mblk_t * 347 ieee80211_defrag(ieee80211com_t *ic, struct ieee80211_node *in, mblk_t *mp, 348 int hdrspace) 349 { 350 struct ieee80211_frame *wh = (struct ieee80211_frame *)mp->b_rptr; 351 struct ieee80211_frame *lwh; 352 mblk_t *mfrag; 353 uint16_t rxseq; 354 uint8_t fragno; 355 uint8_t more_frag; 356 357 ASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1)); 358 more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; 359 rxseq = LE_16(*(uint16_t *)wh->i_seq); 360 fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; 361 362 /* Quick way out, if there's nothing to defragment */ 363 if (!more_frag && fragno == 0 && in->in_rxfrag == NULL) 364 return (mp); 365 366 /* 367 * Remove frag to insure it doesn't get reaped by timer. 368 */ 369 if (in->in_table == NULL) { 370 /* 371 * Should never happen. If the node is orphaned (not in 372 * the table) then input packets should not reach here. 373 * Otherwise, a concurrent request that yanks the table 374 * should be blocked by other interlocking and/or by first 375 * shutting the driver down. Regardless, be defensive 376 * here and just bail 377 */ 378 freemsg(mp); 379 return (NULL); 380 } 381 IEEE80211_NODE_LOCK(in->in_table); 382 mfrag = in->in_rxfrag; 383 in->in_rxfrag = NULL; 384 IEEE80211_NODE_UNLOCK(in->in_table); 385 386 /* 387 * Validate new fragment is in order and 388 * related to the previous ones. 389 */ 390 if (mfrag != NULL) { 391 uint16_t last_rxseq; 392 393 lwh = (struct ieee80211_frame *)mfrag->b_rptr; 394 last_rxseq = LE_16(*(uint16_t *)lwh->i_seq); 395 /* 396 * Sequence control field contains 12-bit sequence no 397 * and 4-bit fragment number. For fragemnts, the 398 * sequence no is not changed. 399 * NB: check seq # and frag together 400 */ 401 if (rxseq != last_rxseq + 1 || 402 !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || 403 !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { 404 /* 405 * Unrelated fragment or no space for it, 406 * clear current fragments. 407 */ 408 freemsg(mfrag); 409 mfrag = NULL; 410 } 411 } 412 413 if (mfrag == NULL) { 414 if (fragno != 0) { /* !first fragment, discard */ 415 freemsg(mp); 416 return (NULL); 417 } 418 mfrag = mp; 419 } else { /* concatenate */ 420 (void) adjmsg(mp, hdrspace); 421 linkb(mfrag, mp); 422 /* track last seqnum and fragno */ 423 lwh = (struct ieee80211_frame *)mfrag->b_rptr; 424 *(uint16_t *)lwh->i_seq = *(uint16_t *)wh->i_seq; 425 } 426 if (more_frag != 0) { /* more to come, save */ 427 in->in_rxfragstamp = ddi_get_lbolt(); 428 in->in_rxfrag = mfrag; 429 mfrag = NULL; 430 } 431 432 return (mfrag); 433 } 434 435 /* 436 * Install received rate set information in the node's state block. 437 */ 438 int 439 ieee80211_setup_rates(struct ieee80211_node *in, const uint8_t *rates, 440 const uint8_t *xrates, int flags) 441 { 442 struct ieee80211_rateset *rs = &in->in_rates; 443 444 bzero(rs, sizeof (*rs)); 445 rs->ir_nrates = rates[1]; 446 /* skip 1 byte element ID and 1 byte length */ 447 bcopy(rates + 2, rs->ir_rates, rs->ir_nrates); 448 if (xrates != NULL) { 449 uint8_t nxrates; 450 451 /* 452 * Tack on 11g extended supported rate element. 453 */ 454 nxrates = xrates[1]; 455 if (rs->ir_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { 456 nxrates = IEEE80211_RATE_MAXSIZE - rs->ir_nrates; 457 ieee80211_dbg(IEEE80211_MSG_XRATE, 458 "ieee80211_setup_rates: %s", 459 "[%s] extended rate set too large;" 460 " only using %u of %u rates\n", 461 ieee80211_macaddr_sprintf(in->in_macaddr), 462 nxrates, xrates[1]); 463 } 464 bcopy(xrates + 2, rs->ir_rates + rs->ir_nrates, nxrates); 465 rs->ir_nrates += nxrates; 466 } 467 return (ieee80211_fix_rate(in, flags)); 468 } 469 470 /* 471 * Process open-system authentication response frame and start 472 * association if the authentication request is accepted. 473 */ 474 static void 475 ieee80211_auth_open(ieee80211com_t *ic, struct ieee80211_frame *wh, 476 struct ieee80211_node *in, uint16_t seq, uint16_t status) 477 { 478 IEEE80211_LOCK_ASSERT(ic); 479 if (in->in_authmode == IEEE80211_AUTH_SHARED) { 480 ieee80211_dbg(IEEE80211_MSG_AUTH, 481 "open auth: bad sta auth mode %u", in->in_authmode); 482 return; 483 } 484 if (ic->ic_opmode == IEEE80211_M_STA) { 485 if (ic->ic_state != IEEE80211_S_AUTH || 486 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 487 return; 488 } 489 IEEE80211_UNLOCK(ic); 490 if (status != 0) { 491 ieee80211_dbg(IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 492 "open auth failed (reason %d)\n", status); 493 if (in != ic->ic_bss) 494 in->in_fails++; 495 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 496 } else { 497 /* i_fc[0] - frame control's type & subtype field */ 498 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 499 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 500 } 501 IEEE80211_LOCK(ic); 502 } else { 503 ieee80211_dbg(IEEE80211_MSG_AUTH, "ieee80211_auth_open: " 504 "bad operating mode %u", ic->ic_opmode); 505 } 506 } 507 508 /* 509 * Allocate challenge text for use by shared-key authentication 510 * Return B_TRUE on success, B_FALST otherwise. 511 */ 512 static boolean_t 513 ieee80211_alloc_challenge(struct ieee80211_node *in) 514 { 515 if (in->in_challenge == NULL) { 516 in->in_challenge = kmem_alloc(IEEE80211_CHALLENGE_LEN, 517 KM_NOSLEEP); 518 } 519 if (in->in_challenge == NULL) { 520 ieee80211_dbg(IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 521 "[%s] shared key challenge alloc failed\n", 522 ieee80211_macaddr_sprintf(in->in_macaddr)); 523 } 524 return (in->in_challenge != NULL); 525 } 526 527 /* 528 * Process shared-key authentication response frames. If authentication 529 * succeeds, start association; otherwise, restart scan. 530 */ 531 static void 532 ieee80211_auth_shared(ieee80211com_t *ic, struct ieee80211_frame *wh, 533 uint8_t *frm, uint8_t *efrm, struct ieee80211_node *in, uint16_t seq, 534 uint16_t status) 535 { 536 uint8_t *challenge; 537 538 /* 539 * Pre-shared key authentication is evil; accept 540 * it only if explicitly configured (it is supported 541 * mainly for compatibility with clients like OS X). 542 */ 543 IEEE80211_LOCK_ASSERT(ic); 544 if (in->in_authmode != IEEE80211_AUTH_AUTO && 545 in->in_authmode != IEEE80211_AUTH_SHARED) { 546 ieee80211_dbg(IEEE80211_MSG_AUTH, "ieee80211_auth_shared: " 547 "bad sta auth mode %u", in->in_authmode); 548 goto bad; 549 } 550 551 challenge = NULL; 552 if (frm + 1 < efrm) { 553 /* 554 * Challenge text information element 555 * frm[0] - element ID 556 * frm[1] - length 557 * frm[2]... - challenge text 558 */ 559 if ((frm[1] + 2) > (_PTRDIFF(efrm, frm))) { 560 ieee80211_dbg(IEEE80211_MSG_AUTH, 561 "ieee80211_auth_shared: ie %d%d too long\n", 562 frm[0], (frm[1] + 2) - (_PTRDIFF(efrm, frm))); 563 goto bad; 564 } 565 if (*frm == IEEE80211_ELEMID_CHALLENGE) 566 challenge = frm; 567 frm += frm[1] + 2; 568 } 569 switch (seq) { 570 case IEEE80211_AUTH_SHARED_CHALLENGE: 571 case IEEE80211_AUTH_SHARED_RESPONSE: 572 if (challenge == NULL) { 573 ieee80211_dbg(IEEE80211_MSG_AUTH, 574 "ieee80211_auth_shared: no challenge\n"); 575 goto bad; 576 } 577 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 578 ieee80211_dbg(IEEE80211_MSG_AUTH, 579 "ieee80211_auth_shared: bad challenge len %d\n", 580 challenge[1]); 581 goto bad; 582 } 583 default: 584 break; 585 } 586 switch (ic->ic_opmode) { 587 case IEEE80211_M_STA: 588 if (ic->ic_state != IEEE80211_S_AUTH) 589 return; 590 switch (seq) { 591 case IEEE80211_AUTH_SHARED_PASS: 592 if (in->in_challenge != NULL) { 593 kmem_free(in->in_challenge, 594 IEEE80211_CHALLENGE_LEN); 595 in->in_challenge = NULL; 596 } 597 if (status != 0) { 598 ieee80211_dbg(IEEE80211_MSG_DEBUG | 599 IEEE80211_MSG_AUTH, 600 "shared key auth failed (reason %d)\n", 601 status); 602 if (in != ic->ic_bss) 603 in->in_fails++; 604 return; 605 } 606 IEEE80211_UNLOCK(ic); 607 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 608 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 609 IEEE80211_LOCK(ic); 610 break; 611 case IEEE80211_AUTH_SHARED_CHALLENGE: 612 if (!ieee80211_alloc_challenge(in)) 613 return; 614 bcopy(&challenge[2], in->in_challenge, challenge[1]); 615 IEEE80211_UNLOCK(ic); 616 IEEE80211_SEND_MGMT(ic, in, IEEE80211_FC0_SUBTYPE_AUTH, 617 seq + 1); 618 IEEE80211_LOCK(ic); 619 break; 620 default: 621 ieee80211_dbg(IEEE80211_MSG_AUTH, "80211_auth_shared: " 622 "shared key auth: bad seq %d", seq); 623 return; 624 } 625 break; 626 627 default: 628 ieee80211_dbg(IEEE80211_MSG_AUTH, 629 "ieee80211_auth_shared: bad opmode %u\n", 630 ic->ic_opmode); 631 break; 632 } 633 return; 634 bad: 635 if (ic->ic_opmode == IEEE80211_M_STA) { 636 /* 637 * Kick the state machine. This short-circuits 638 * using the mgt frame timeout to trigger the 639 * state transition. 640 */ 641 if (ic->ic_state == IEEE80211_S_AUTH) { 642 IEEE80211_UNLOCK(ic); 643 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 644 IEEE80211_LOCK(ic); 645 } 646 } 647 } 648 649 static int 650 iswpaoui(const uint8_t *frm) 651 { 652 uint32_t c = *(uint32_t *)(frm + 2); 653 return (frm[1] > 3 && c == ((WPA_OUI_TYPE << 24) | WPA_OUI)); 654 } 655 656 /* 657 * Process a beacon/probe response frame. 658 * When the device is in station mode, create a node and add it 659 * to the node database for a new ESS or update node info if it's 660 * already there. 661 */ 662 static void 663 ieee80211_recv_beacon(ieee80211com_t *ic, mblk_t *mp, struct ieee80211_node *in, 664 int subtype, int rssi, uint32_t rstamp) 665 { 666 ieee80211_impl_t *im = ic->ic_private; 667 struct ieee80211_frame *wh; 668 uint8_t *frm; 669 uint8_t *efrm; /* end of frame body */ 670 struct ieee80211_scanparams scan; 671 672 wh = (struct ieee80211_frame *)mp->b_rptr; 673 frm = (uint8_t *)&wh[1]; 674 efrm = (uint8_t *)mp->b_wptr; 675 676 /* 677 * We process beacon/probe response frames: 678 * o when scanning, or 679 * o station mode when associated (to collect state 680 * updates such as 802.11g slot time), or 681 * o adhoc mode (to discover neighbors) 682 * Frames otherwise received are discarded. 683 */ 684 if (!((ic->ic_flags & IEEE80211_F_SCAN) || 685 (ic->ic_opmode == IEEE80211_M_STA && in->in_associd != 0) || 686 ic->ic_opmode == IEEE80211_M_IBSS)) { 687 return; 688 } 689 690 /* 691 * beacon/probe response frame format 692 * [8] time stamp 693 * [2] beacon interval 694 * [2] capability information 695 * [tlv] ssid 696 * [tlv] supported rates 697 * [tlv] country information 698 * [tlv] parameter set (FH/DS) 699 * [tlv] erp information 700 * [tlv] extended supported rates 701 * [tlv] WME 702 * [tlv] WPA or RSN 703 */ 704 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), 705 IEEE80211_BEACON_ELEM_MIN, return); 706 bzero(&scan, sizeof (scan)); 707 scan.tstamp = frm; 708 frm += 8; 709 scan.bintval = (*(uint16_t *)frm); 710 frm += 2; 711 scan.capinfo = (*(uint16_t *)frm); 712 frm += 2; 713 scan.bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); 714 scan.chan = scan.bchan; 715 716 while (frm < efrm) { 717 /* Agere element in beacon */ 718 if ((*frm == IEEE80211_ELEMID_AGERE1) || 719 (*frm == IEEE80211_ELEMID_AGERE2)) { 720 frm = efrm; 721 break; 722 } 723 724 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), frm[1], return); 725 switch (*frm) { 726 case IEEE80211_ELEMID_SSID: 727 scan.ssid = frm; 728 break; 729 case IEEE80211_ELEMID_RATES: 730 scan.rates = frm; 731 break; 732 case IEEE80211_ELEMID_COUNTRY: 733 scan.country = frm; 734 break; 735 case IEEE80211_ELEMID_FHPARMS: 736 if (ic->ic_phytype == IEEE80211_T_FH) { 737 scan.fhdwell = LE_16(*(uint16_t *)(frm + 2)); 738 scan.chan = IEEE80211_FH_CHAN(frm[4], frm[5]); 739 scan.fhindex = frm[6]; 740 scan.phytype = IEEE80211_T_FH; 741 } 742 break; 743 case IEEE80211_ELEMID_DSPARMS: 744 if (ic->ic_phytype != IEEE80211_T_FH) { 745 scan.chan = frm[2]; 746 scan.phytype = IEEE80211_T_DS; 747 } 748 break; 749 case IEEE80211_ELEMID_TIM: 750 scan.tim = frm; 751 scan.timoff = _PTRDIFF(frm, mp->b_rptr); 752 break; 753 case IEEE80211_ELEMID_IBSSPARMS: 754 break; 755 case IEEE80211_ELEMID_XRATES: 756 scan.xrates = frm; 757 break; 758 case IEEE80211_ELEMID_ERP: 759 if (frm[1] != 1) { 760 ieee80211_dbg(IEEE80211_MSG_ELEMID, 761 "ieee80211_recv_mgmt: ignore %s, " 762 "invalid ERP element; " 763 "length %u, expecting 1\n", 764 IEEE80211_SUBTYPE_NAME(subtype), 765 frm[1]); 766 break; 767 } 768 scan.erp = frm[2]; 769 scan.phytype = IEEE80211_T_OFDM; 770 break; 771 case IEEE80211_ELEMID_RSN: 772 scan.wpa = frm; 773 break; 774 case IEEE80211_ELEMID_VENDOR: 775 if (iswpaoui(frm)) 776 scan.wpa = frm; /* IEEE802.11i D3.0 */ 777 break; 778 default: 779 ieee80211_dbg(IEEE80211_MSG_ELEMID, 780 "ieee80211_recv_mgmt: ignore %s," 781 "unhandled id %u, len %u, totallen %u", 782 IEEE80211_SUBTYPE_NAME(subtype), 783 *frm, frm[1], 784 MBLKL(mp)); 785 break; 786 } 787 /* frm[1] - component length */ 788 frm += IEEE80211_ELEM_LEN(frm[1]); 789 } 790 IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE, return); 791 IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN, return); 792 if (ieee80211_isclr(ic->ic_chan_active, scan.chan)) { 793 ieee80211_dbg(IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 794 "ieee80211_recv_mgmt: ignore %s ," 795 "invalid channel %u\n", 796 IEEE80211_SUBTYPE_NAME(subtype), scan.chan); 797 return; 798 } 799 if (scan.chan != scan.bchan && 800 ic->ic_phytype != IEEE80211_T_FH) { 801 /* 802 * Frame was received on a channel different from the 803 * one indicated in the DS params element id; 804 * silently discard it. 805 * 806 * NB: this can happen due to signal leakage. 807 * But we should take it for FH phy because 808 * the rssi value should be correct even for 809 * different hop pattern in FH. 810 */ 811 ieee80211_dbg(IEEE80211_MSG_ELEMID, 812 "ieee80211_recv_mgmt: ignore %s ," 813 "phytype %u channel %u marked for %u\n", 814 IEEE80211_SUBTYPE_NAME(subtype), 815 ic->ic_phytype, scan.bchan, scan.chan); 816 return; 817 } 818 if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && 819 scan.bintval <= IEEE80211_BINTVAL_MAX)) { 820 ieee80211_dbg(IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, 821 "ieee80211_recv_mgmt: ignore %s ," 822 "bogus beacon interval %u\n", 823 IEEE80211_SUBTYPE_NAME(subtype), scan.bintval); 824 return; 825 } 826 827 /* 828 * When operating in station mode, check for state updates. 829 * Be careful to ignore beacons received while doing a 830 * background scan. We consider only 11g/WMM stuff right now. 831 */ 832 if (ic->ic_opmode == IEEE80211_M_STA && 833 in->in_associd != 0 && 834 (!(ic->ic_flags & IEEE80211_F_SCAN) || 835 IEEE80211_ADDR_EQ(wh->i_addr2, in->in_bssid))) { 836 /* record tsf of last beacon */ 837 bcopy(scan.tstamp, in->in_tstamp.data, 838 sizeof (in->in_tstamp)); 839 /* count beacon frame for s/w bmiss handling */ 840 im->im_swbmiss_count++; 841 im->im_bmiss_count = 0; 842 843 if ((in->in_capinfo ^ scan.capinfo) & 844 IEEE80211_CAPINFO_SHORT_SLOTTIME) { 845 ieee80211_dbg(IEEE80211_MSG_ASSOC, 846 "ieee80211_recv_mgmt: " 847 "[%s] cap change: before 0x%x, now 0x%x\n", 848 ieee80211_macaddr_sprintf(wh->i_addr2), 849 in->in_capinfo, scan.capinfo); 850 /* 851 * NB: we assume short preamble doesn't 852 * change dynamically 853 */ 854 ieee80211_set_shortslottime(ic, 855 ic->ic_curmode == IEEE80211_MODE_11A || 856 (scan.capinfo & 857 IEEE80211_CAPINFO_SHORT_SLOTTIME)); 858 in->in_capinfo = scan.capinfo; 859 } 860 861 if (scan.tim != NULL) { 862 struct ieee80211_tim_ie *ie; 863 864 ie = (struct ieee80211_tim_ie *)scan.tim; 865 in->in_dtim_count = ie->tim_count; 866 in->in_dtim_period = ie->tim_period; 867 } 868 if (ic->ic_flags & IEEE80211_F_SCAN) { 869 ieee80211_add_scan(ic, &scan, wh, subtype, rssi, 870 rstamp); 871 } 872 return; 873 } 874 /* 875 * If scanning, just pass information to the scan module. 876 */ 877 if (ic->ic_flags & IEEE80211_F_SCAN) { 878 ieee80211_add_scan(ic, &scan, wh, subtype, rssi, rstamp); 879 return; 880 } 881 882 if (ic->ic_opmode == IEEE80211_M_IBSS && 883 scan.capinfo & IEEE80211_CAPINFO_IBSS) { 884 if (!IEEE80211_ADDR_EQ(wh->i_addr2, in->in_macaddr)) { 885 /* 886 * Create a new entry in the neighbor table. 887 */ 888 in = ieee80211_add_neighbor(ic, wh, &scan); 889 } else { 890 /* 891 * Copy data from beacon to neighbor table. 892 * Some of this information might change after 893 * ieee80211_add_neighbor(), so we just copy 894 * everything over to be safe. 895 */ 896 ieee80211_init_neighbor(in, wh, &scan); 897 } 898 if (in != NULL) { 899 in->in_rssi = (uint8_t)rssi; 900 in->in_rstamp = rstamp; 901 } 902 } 903 } 904 905 /* 906 * Perform input processing for 802.11 management frames. 907 * It's the default ic_recv_mgmt callback function for the interface 908 * softc, ic. Tipically ic_recv_mgmt is called within ieee80211_input() 909 */ 910 void 911 ieee80211_recv_mgmt(ieee80211com_t *ic, mblk_t *mp, struct ieee80211_node *in, 912 int subtype, int rssi, uint32_t rstamp) 913 { 914 struct ieee80211_frame *wh; 915 uint8_t *frm; /* pointer to start of the frame */ 916 uint8_t *efrm; /* pointer to end of the frame */ 917 uint8_t *ssid; 918 uint8_t *rates; 919 uint8_t *xrates; /* extended rates */ 920 boolean_t allocbs = B_FALSE; 921 uint8_t rate; 922 uint16_t algo; /* authentication algorithm */ 923 uint16_t seq; /* sequence no */ 924 uint16_t status; 925 uint16_t capinfo; 926 uint16_t associd; /* association ID */ 927 928 IEEE80211_LOCK(ic); 929 wh = (struct ieee80211_frame *)mp->b_rptr; 930 frm = (uint8_t *)&wh[1]; 931 efrm = (uint8_t *)mp->b_wptr; 932 switch (subtype) { 933 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 934 case IEEE80211_FC0_SUBTYPE_BEACON: 935 ieee80211_recv_beacon(ic, mp, in, subtype, rssi, rstamp); 936 break; 937 938 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 939 if (ic->ic_opmode == IEEE80211_M_STA || 940 ic->ic_state != IEEE80211_S_RUN || 941 IEEE80211_IS_MULTICAST(wh->i_addr2)) { 942 break; 943 } 944 945 /* 946 * prreq frame format 947 * [tlv] ssid 948 * [tlv] supported rates 949 * [tlv] extended supported rates 950 */ 951 ssid = rates = xrates = NULL; 952 while (frm < efrm) { 953 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), 954 frm[1], goto out); 955 switch (*frm) { 956 case IEEE80211_ELEMID_SSID: 957 ssid = frm; 958 break; 959 case IEEE80211_ELEMID_RATES: 960 rates = frm; 961 break; 962 case IEEE80211_ELEMID_XRATES: 963 xrates = frm; 964 break; 965 } 966 frm += frm[1] + 2; 967 } 968 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, break); 969 if (xrates != NULL) { 970 IEEE80211_VERIFY_ELEMENT(xrates, 971 IEEE80211_RATE_MAXSIZE - rates[1], break); 972 } 973 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, break); 974 IEEE80211_VERIFY_SSID(ic->ic_bss, ssid, break); 975 if (ic->ic_flags & IEEE80211_F_HIDESSID) { 976 if (ssid == NULL || ssid[1] == 0) { 977 ieee80211_dbg(IEEE80211_MSG_INPUT, 978 "ieee80211_recv_mgmt: ignore %s, " 979 "no ssid with ssid suppression enabled", 980 IEEE80211_SUBTYPE_NAME(subtype)); 981 break; 982 } 983 } 984 985 if (in == ic->ic_bss) { 986 if (ic->ic_opmode != IEEE80211_M_IBSS) { 987 in = ieee80211_tmp_node(ic, wh->i_addr2); 988 allocbs = B_TRUE; 989 } else if (!IEEE80211_ADDR_EQ(wh->i_addr2, 990 in->in_macaddr)) { 991 /* 992 * Cannot tell if the sender is operating 993 * in ibss mode. But we need a new node to 994 * send the response so blindly add them to the 995 * neighbor table. 996 */ 997 in = ieee80211_fakeup_adhoc_node(&ic->ic_sta, 998 wh->i_addr2); 999 } 1000 if (in == NULL) 1001 break; 1002 } 1003 ieee80211_dbg(IEEE80211_MSG_ASSOC, "ieee80211_recv_mgmt: " 1004 "[%s] recv probe req\n", 1005 ieee80211_macaddr_sprintf(wh->i_addr2)); 1006 in->in_rssi = (uint8_t)rssi; 1007 in->in_rstamp = rstamp; 1008 /* 1009 * Adjust and check station's rate list with device's 1010 * supported rate. Send back response if there is at 1011 * least one rate or the fixed rate(if being set) is 1012 * supported by both station and the device 1013 */ 1014 rate = ieee80211_setup_rates(in, rates, xrates, 1015 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1016 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1017 if (rate & IEEE80211_RATE_BASIC) { 1018 ieee80211_dbg(IEEE80211_MSG_XRATE, "ieee80211_recv_mgmt" 1019 "%s recv'd rate set invalid", 1020 IEEE80211_SUBTYPE_NAME(subtype)); 1021 } else { 1022 IEEE80211_UNLOCK(ic); 1023 IEEE80211_SEND_MGMT(ic, in, 1024 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); 1025 IEEE80211_LOCK(ic); 1026 } 1027 if (allocbs) { 1028 /* 1029 * Temporary node created just to send a 1030 * response, reclaim immediately. 1031 */ 1032 ieee80211_free_node(in); 1033 } 1034 break; 1035 1036 case IEEE80211_FC0_SUBTYPE_AUTH: 1037 /* 1038 * auth frame format 1039 * [2] algorithm 1040 * [2] sequence 1041 * [2] status 1042 * [tlv*] challenge 1043 */ 1044 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), 1045 IEEE80211_AUTH_ELEM_MIN, break); 1046 algo = (*(uint16_t *)frm); 1047 seq = (*(uint16_t *)(frm + 2)); 1048 status = (*(uint16_t *)(frm + 4)); 1049 ieee80211_dbg(IEEE80211_MSG_AUTH, "ieee80211_recv_mgmt: " 1050 "[%s] recv auth frame with algorithm %d seq %d\n", 1051 ieee80211_macaddr_sprintf(wh->i_addr2), algo, seq); 1052 1053 if (ic->ic_flags & IEEE80211_F_COUNTERM) { 1054 ieee80211_dbg(IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1055 "ieee80211_recv_mgmt: ignore auth, %s\n", 1056 "TKIP countermeasures enabled"); 1057 break; 1058 } 1059 switch (algo) { 1060 case IEEE80211_AUTH_ALG_SHARED: 1061 ieee80211_auth_shared(ic, wh, frm + 6, efrm, in, 1062 seq, status); 1063 break; 1064 case IEEE80211_AUTH_ALG_OPEN: 1065 ieee80211_auth_open(ic, wh, in, seq, status); 1066 break; 1067 default: 1068 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_recv_mgmt: " 1069 "ignore auth, unsupported alg %d", algo); 1070 break; 1071 } 1072 break; 1073 1074 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1075 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1076 if (ic->ic_opmode != IEEE80211_M_STA || 1077 ic->ic_state != IEEE80211_S_ASSOC) 1078 break; 1079 1080 /* 1081 * asresp frame format 1082 * [2] capability information 1083 * [2] status 1084 * [2] association ID 1085 * [tlv] supported rates 1086 * [tlv] extended supported rates 1087 * [tlv] WME 1088 */ 1089 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), 1090 IEEE80211_ASSOC_RESP_ELEM_MIN, break); 1091 in = ic->ic_bss; 1092 capinfo = (*(uint16_t *)frm); 1093 frm += 2; 1094 status = (*(uint16_t *)frm); 1095 frm += 2; 1096 if (status != 0) { 1097 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1098 "assoc failed (reason %d)\n", status); 1099 in = ieee80211_find_node(&ic->ic_scan, wh->i_addr2); 1100 if (in != NULL) { 1101 in->in_fails++; 1102 ieee80211_free_node(in); 1103 } 1104 break; 1105 } 1106 associd = (*(uint16_t *)frm); 1107 frm += 2; 1108 1109 rates = xrates = NULL; 1110 while (frm < efrm) { 1111 /* 1112 * Do not discard frames containing proprietary Agere 1113 * elements 128 and 129, as the reported element length 1114 * is often wrong. Skip rest of the frame, since we can 1115 * not rely on the given element length making it 1116 * impossible to know where the next element starts 1117 */ 1118 if ((*frm == IEEE80211_ELEMID_AGERE1) || 1119 (*frm == IEEE80211_ELEMID_AGERE2)) { 1120 frm = efrm; 1121 break; 1122 } 1123 1124 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), 1125 frm[1], goto out); 1126 switch (*frm) { 1127 case IEEE80211_ELEMID_RATES: 1128 rates = frm; 1129 break; 1130 case IEEE80211_ELEMID_XRATES: 1131 xrates = frm; 1132 break; 1133 } 1134 frm += frm[1] + 2; 1135 } 1136 1137 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, break); 1138 /* 1139 * Adjust and check AP's rate list with device's 1140 * supported rate. Re-start scan if no rate is or the 1141 * fixed rate(if being set) cannot be supported by 1142 * either AP or the device. 1143 */ 1144 rate = ieee80211_setup_rates(in, rates, xrates, 1145 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1146 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1147 if (rate & IEEE80211_RATE_BASIC) { 1148 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1149 "assoc failed (rate set mismatch)\n"); 1150 if (in != ic->ic_bss) 1151 in->in_fails++; 1152 IEEE80211_UNLOCK(ic); 1153 ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); 1154 return; 1155 } 1156 1157 in->in_capinfo = capinfo; 1158 in->in_associd = associd; 1159 in->in_flags &= ~IEEE80211_NODE_QOS; 1160 /* 1161 * Configure state now that we are associated. 1162 */ 1163 if (ic->ic_curmode == IEEE80211_MODE_11A || 1164 (in->in_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1165 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1166 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1167 } else { 1168 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1169 ic->ic_flags |= IEEE80211_F_USEBARKER; 1170 } 1171 ieee80211_set_shortslottime(ic, 1172 ic->ic_curmode == IEEE80211_MODE_11A || 1173 (in->in_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1174 /* 1175 * Honor ERP protection. 1176 * 1177 * NB: in_erp should zero for non-11g operation. 1178 * check ic_curmode anyway 1179 */ 1180 if (ic->ic_curmode == IEEE80211_MODE_11G && 1181 (in->in_erp & IEEE80211_ERP_USE_PROTECTION)) 1182 ic->ic_flags |= IEEE80211_F_USEPROT; 1183 else 1184 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1185 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1186 "assoc success: %s preamble, %s slot time%s%s\n", 1187 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1188 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1189 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1190 in->in_flags & IEEE80211_NODE_QOS ? ", QoS" : ""); 1191 IEEE80211_UNLOCK(ic); 1192 ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); 1193 return; 1194 1195 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1196 if (ic->ic_state == IEEE80211_S_SCAN) 1197 break; 1198 1199 /* 1200 * deauth frame format 1201 * [2] reason 1202 */ 1203 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), 2, break); 1204 status = (*(uint16_t *)frm); 1205 1206 ieee80211_dbg(IEEE80211_MSG_AUTH, 1207 "recv deauthenticate (reason %d)\n", status); 1208 switch (ic->ic_opmode) { 1209 case IEEE80211_M_STA: 1210 IEEE80211_UNLOCK(ic); 1211 ieee80211_new_state(ic, IEEE80211_S_AUTH, 1212 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1213 return; 1214 default: 1215 break; 1216 } 1217 break; 1218 1219 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1220 if (ic->ic_state != IEEE80211_S_RUN && 1221 ic->ic_state != IEEE80211_S_ASSOC && 1222 ic->ic_state != IEEE80211_S_AUTH) 1223 break; 1224 /* 1225 * disassoc frame format 1226 * [2] reason 1227 */ 1228 IEEE80211_VERIFY_LENGTH(_PTRDIFF(efrm, frm), 2, break); 1229 status = (*(uint16_t *)frm); 1230 1231 ieee80211_dbg(IEEE80211_MSG_ASSOC, 1232 "recv disassociate (reason %d)\n", status); 1233 switch (ic->ic_opmode) { 1234 case IEEE80211_M_STA: 1235 IEEE80211_UNLOCK(ic); 1236 ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1237 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); 1238 return; 1239 default: 1240 break; 1241 } 1242 break; 1243 1244 default: 1245 ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_recv_mgmt: " 1246 "subtype 0x%x not handled\n", subtype); 1247 break; 1248 } /* switch subtype */ 1249 out: 1250 IEEE80211_UNLOCK(ic); 1251 } 1252