ieee80211_sta.c revision 209016
1/*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27#ifdef __FreeBSD__ 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_sta.c 209016 2010-06-10 20:58:34Z rpaulo $"); 29#endif 30 31/* 32 * IEEE 802.11 Station mode support. 33 */ 34#include "opt_inet.h" 35#include "opt_wlan.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/mbuf.h> 40#include <sys/malloc.h> 41#include <sys/kernel.h> 42 43#include <sys/socket.h> 44#include <sys/sockio.h> 45#include <sys/endian.h> 46#include <sys/errno.h> 47#include <sys/proc.h> 48#include <sys/sysctl.h> 49 50#include <net/if.h> 51#include <net/if_media.h> 52#include <net/if_llc.h> 53#include <net/ethernet.h> 54 55#include <net/bpf.h> 56 57#include <net80211/ieee80211_var.h> 58#include <net80211/ieee80211_sta.h> 59#include <net80211/ieee80211_input.h> 60#ifdef IEEE80211_SUPPORT_SUPERG 61#include <net80211/ieee80211_superg.h> 62#endif 63 64#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 65 66static void sta_vattach(struct ieee80211vap *); 67static void sta_beacon_miss(struct ieee80211vap *); 68static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 70static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 71 int subtype, int rssi, int nf); 72static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 73 74void 75ieee80211_sta_attach(struct ieee80211com *ic) 76{ 77 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 78} 79 80void 81ieee80211_sta_detach(struct ieee80211com *ic) 82{ 83} 84 85static void 86sta_vdetach(struct ieee80211vap *vap) 87{ 88} 89 90static void 91sta_vattach(struct ieee80211vap *vap) 92{ 93 vap->iv_newstate = sta_newstate; 94 vap->iv_input = sta_input; 95 vap->iv_recv_mgmt = sta_recv_mgmt; 96 vap->iv_recv_ctl = sta_recv_ctl; 97 vap->iv_opdetach = sta_vdetach; 98 vap->iv_bmiss = sta_beacon_miss; 99} 100 101/* 102 * Handle a beacon miss event. The common code filters out 103 * spurious events that can happen when scanning and/or before 104 * reaching RUN state. 105 */ 106static void 107sta_beacon_miss(struct ieee80211vap *vap) 108{ 109 struct ieee80211com *ic = vap->iv_ic; 110 111 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 112 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 113 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 114 115 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 116 "beacon miss, mode %s state %s\n", 117 ieee80211_opmode_name[vap->iv_opmode], 118 ieee80211_state_name[vap->iv_state]); 119 120 if (vap->iv_state == IEEE80211_S_CSA) { 121 /* 122 * A Channel Switch is pending; assume we missed the 123 * beacon that would've completed the process and just 124 * force the switch. If we made a mistake we'll not 125 * find the AP on the new channel and fall back to a 126 * normal scan. 127 */ 128 ieee80211_csa_completeswitch(ic); 129 return; 130 } 131 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 132 /* 133 * Send a directed probe req before falling back to a 134 * scan; if we receive a response ic_bmiss_count will 135 * be reset. Some cards mistakenly report beacon miss 136 * so this avoids the expensive scan if the ap is 137 * still there. 138 */ 139 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 140 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 141 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 142 return; 143 } 144 145 callout_stop(&vap->iv_swbmiss); 146 vap->iv_bmiss_count = 0; 147 vap->iv_stats.is_beacon_miss++; 148 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 149#ifdef IEEE80211_SUPPORT_SUPERG 150 struct ieee80211com *ic = vap->iv_ic; 151 152 /* 153 * If we receive a beacon miss interrupt when using 154 * dynamic turbo, attempt to switch modes before 155 * reassociating. 156 */ 157 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 158 ieee80211_dturbo_switch(vap, 159 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 160#endif 161 /* 162 * Try to reassociate before scanning for a new ap. 163 */ 164 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 165 } else { 166 /* 167 * Somebody else is controlling state changes (e.g. 168 * a user-mode app) don't do anything that would 169 * confuse them; just drop into scan mode so they'll 170 * notified of the state change and given control. 171 */ 172 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 173 } 174} 175 176/* 177 * Handle deauth with reason. We retry only for 178 * the cases where we might succeed. Otherwise 179 * we downgrade the ap and scan. 180 */ 181static void 182sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 183{ 184 switch (reason) { 185 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 186 case IEEE80211_STATUS_TIMEOUT: 187 case IEEE80211_REASON_ASSOC_EXPIRE: 188 case IEEE80211_REASON_NOT_AUTHED: 189 case IEEE80211_REASON_NOT_ASSOCED: 190 case IEEE80211_REASON_ASSOC_LEAVE: 191 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 192 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 193 break; 194 default: 195 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 196 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 197 ieee80211_check_scan_current(vap); 198 break; 199 } 200} 201 202/* 203 * IEEE80211_M_STA vap state machine handler. 204 * This routine handles the main states in the 802.11 protocol. 205 */ 206static int 207sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 208{ 209 struct ieee80211com *ic = vap->iv_ic; 210 struct ieee80211_node *ni; 211 enum ieee80211_state ostate; 212 213 IEEE80211_LOCK_ASSERT(ic); 214 215 ostate = vap->iv_state; 216 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 217 __func__, ieee80211_state_name[ostate], 218 ieee80211_state_name[nstate], arg); 219 vap->iv_state = nstate; /* state transition */ 220 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 221 if (ostate != IEEE80211_S_SCAN) 222 ieee80211_cancel_scan(vap); /* background scan */ 223 ni = vap->iv_bss; /* NB: no reference held */ 224 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 225 callout_stop(&vap->iv_swbmiss); 226 switch (nstate) { 227 case IEEE80211_S_INIT: 228 switch (ostate) { 229 case IEEE80211_S_SLEEP: 230 /* XXX wakeup */ 231 case IEEE80211_S_RUN: 232 IEEE80211_SEND_MGMT(ni, 233 IEEE80211_FC0_SUBTYPE_DISASSOC, 234 IEEE80211_REASON_ASSOC_LEAVE); 235 ieee80211_sta_leave(ni); 236 break; 237 case IEEE80211_S_ASSOC: 238 IEEE80211_SEND_MGMT(ni, 239 IEEE80211_FC0_SUBTYPE_DEAUTH, 240 IEEE80211_REASON_AUTH_LEAVE); 241 break; 242 case IEEE80211_S_SCAN: 243 ieee80211_cancel_scan(vap); 244 break; 245 default: 246 goto invalid; 247 } 248 if (ostate != IEEE80211_S_INIT) { 249 /* NB: optimize INIT -> INIT case */ 250 ieee80211_reset_bss(vap); 251 } 252 if (vap->iv_auth->ia_detach != NULL) 253 vap->iv_auth->ia_detach(vap); 254 break; 255 case IEEE80211_S_SCAN: 256 switch (ostate) { 257 case IEEE80211_S_INIT: 258 /* 259 * Initiate a scan. We can come here as a result 260 * of an IEEE80211_IOC_SCAN_REQ too in which case 261 * the vap will be marked with IEEE80211_FEXT_SCANREQ 262 * and the scan request parameters will be present 263 * in iv_scanreq. Otherwise we do the default. 264 */ 265 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 266 ieee80211_check_scan(vap, 267 vap->iv_scanreq_flags, 268 vap->iv_scanreq_duration, 269 vap->iv_scanreq_mindwell, 270 vap->iv_scanreq_maxdwell, 271 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 272 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 273 } else 274 ieee80211_check_scan_current(vap); 275 break; 276 case IEEE80211_S_SCAN: 277 case IEEE80211_S_AUTH: 278 case IEEE80211_S_ASSOC: 279 /* 280 * These can happen either because of a timeout 281 * on an assoc/auth response or because of a 282 * change in state that requires a reset. For 283 * the former we're called with a non-zero arg 284 * that is the cause for the failure; pass this 285 * to the scan code so it can update state. 286 * Otherwise trigger a new scan unless we're in 287 * manual roaming mode in which case an application 288 * must issue an explicit scan request. 289 */ 290 if (arg != 0) 291 ieee80211_scan_assoc_fail(vap, 292 vap->iv_bss->ni_macaddr, arg); 293 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 294 ieee80211_check_scan_current(vap); 295 break; 296 case IEEE80211_S_RUN: /* beacon miss */ 297 /* 298 * Beacon miss. Notify user space and if not 299 * under control of a user application (roaming 300 * manual) kick off a scan to re-connect. 301 */ 302 ieee80211_sta_leave(ni); 303 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 304 ieee80211_check_scan_current(vap); 305 break; 306 default: 307 goto invalid; 308 } 309 break; 310 case IEEE80211_S_AUTH: 311 switch (ostate) { 312 case IEEE80211_S_INIT: 313 case IEEE80211_S_SCAN: 314 IEEE80211_SEND_MGMT(ni, 315 IEEE80211_FC0_SUBTYPE_AUTH, 1); 316 break; 317 case IEEE80211_S_AUTH: 318 case IEEE80211_S_ASSOC: 319 switch (arg & 0xff) { 320 case IEEE80211_FC0_SUBTYPE_AUTH: 321 /* ??? */ 322 IEEE80211_SEND_MGMT(ni, 323 IEEE80211_FC0_SUBTYPE_AUTH, 2); 324 break; 325 case IEEE80211_FC0_SUBTYPE_DEAUTH: 326 sta_authretry(vap, ni, arg>>8); 327 break; 328 } 329 break; 330 case IEEE80211_S_RUN: 331 switch (arg & 0xff) { 332 case IEEE80211_FC0_SUBTYPE_AUTH: 333 IEEE80211_SEND_MGMT(ni, 334 IEEE80211_FC0_SUBTYPE_AUTH, 2); 335 vap->iv_state = ostate; /* stay RUN */ 336 break; 337 case IEEE80211_FC0_SUBTYPE_DEAUTH: 338 ieee80211_sta_leave(ni); 339 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 340 /* try to reauth */ 341 IEEE80211_SEND_MGMT(ni, 342 IEEE80211_FC0_SUBTYPE_AUTH, 1); 343 } 344 break; 345 } 346 break; 347 default: 348 goto invalid; 349 } 350 break; 351 case IEEE80211_S_ASSOC: 352 switch (ostate) { 353 case IEEE80211_S_AUTH: 354 case IEEE80211_S_ASSOC: 355 IEEE80211_SEND_MGMT(ni, 356 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 357 break; 358 case IEEE80211_S_SLEEP: /* cannot happen */ 359 case IEEE80211_S_RUN: 360 ieee80211_sta_leave(ni); 361 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 362 IEEE80211_SEND_MGMT(ni, arg ? 363 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 364 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 365 } 366 break; 367 default: 368 goto invalid; 369 } 370 break; 371 case IEEE80211_S_RUN: 372 if (vap->iv_flags & IEEE80211_F_WPA) { 373 /* XXX validate prerequisites */ 374 } 375 switch (ostate) { 376 case IEEE80211_S_RUN: 377 case IEEE80211_S_CSA: 378 break; 379 case IEEE80211_S_AUTH: /* when join is done in fw */ 380 case IEEE80211_S_ASSOC: 381#ifdef IEEE80211_DEBUG 382 if (ieee80211_msg_debug(vap)) { 383 ieee80211_note(vap, "%s with %s ssid ", 384 (vap->iv_opmode == IEEE80211_M_STA ? 385 "associated" : "synchronized"), 386 ether_sprintf(ni->ni_bssid)); 387 ieee80211_print_essid(vap->iv_bss->ni_essid, 388 ni->ni_esslen); 389 /* XXX MCS/HT */ 390 printf(" channel %d start %uMb\n", 391 ieee80211_chan2ieee(ic, ic->ic_curchan), 392 IEEE80211_RATE2MBS(ni->ni_txrate)); 393 } 394#endif 395 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 396 ieee80211_notify_node_join(ni, 397 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 398 break; 399 case IEEE80211_S_SLEEP: 400 ieee80211_sta_pwrsave(vap, 0); 401 break; 402 default: 403 goto invalid; 404 } 405 ieee80211_sync_curchan(ic); 406 if (ostate != IEEE80211_S_RUN && 407 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 408 /* 409 * Start s/w beacon miss timer for devices w/o 410 * hardware support. We fudge a bit here since 411 * we're doing this in software. 412 */ 413 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 414 2 * vap->iv_bmissthreshold * ni->ni_intval); 415 vap->iv_swbmiss_count = 0; 416 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 417 ieee80211_swbmiss, vap); 418 } 419 /* 420 * When 802.1x is not in use mark the port authorized 421 * at this point so traffic can flow. 422 */ 423 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 424 ieee80211_node_authorize(ni); 425 /* 426 * Fake association when joining an existing bss. 427 */ 428 if (ic->ic_newassoc != NULL) 429 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 430 break; 431 case IEEE80211_S_CSA: 432 if (ostate != IEEE80211_S_RUN) 433 goto invalid; 434 break; 435 case IEEE80211_S_SLEEP: 436 ieee80211_sta_pwrsave(vap, 1); 437 break; 438 default: 439 invalid: 440 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 441 "%s: unexpected state transition %s -> %s\n", __func__, 442 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 443 break; 444 } 445 return 0; 446} 447 448/* 449 * Return non-zero if the frame is an echo of a multicast 450 * frame sent by ourself. The dir is known to be DSTODS. 451 */ 452static __inline int 453isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 454{ 455#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 456#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 457 const uint8_t *sa; 458 459 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 460 461 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 462 return 0; 463 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 464 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 465#undef WH4 466#undef QWH4 467} 468 469/* 470 * Return non-zero if the frame is an echo of a multicast 471 * frame sent by ourself. The dir is known to be FROMDS. 472 */ 473static __inline int 474isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 475{ 476 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 477 478 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 479 return 0; 480 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 481} 482 483/* 484 * Decide if a received management frame should be 485 * printed when debugging is enabled. This filters some 486 * of the less interesting frames that come frequently 487 * (e.g. beacons). 488 */ 489static __inline int 490doprint(struct ieee80211vap *vap, int subtype) 491{ 492 switch (subtype) { 493 case IEEE80211_FC0_SUBTYPE_BEACON: 494 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 495 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 496 return 0; 497 } 498 return 1; 499} 500 501/* 502 * Process a received frame. The node associated with the sender 503 * should be supplied. If nothing was found in the node table then 504 * the caller is assumed to supply a reference to iv_bss instead. 505 * The RSSI and a timestamp are also supplied. The RSSI data is used 506 * during AP scanning to select a AP to associate with; it can have 507 * any units so long as values have consistent units and higher values 508 * mean ``better signal''. The receive timestamp is currently not used 509 * by the 802.11 layer. 510 */ 511static int 512sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 513{ 514#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 515#define HAS_SEQ(type) ((type & 0x4) == 0) 516 struct ieee80211vap *vap = ni->ni_vap; 517 struct ieee80211com *ic = ni->ni_ic; 518 struct ifnet *ifp = vap->iv_ifp; 519 struct ieee80211_frame *wh; 520 struct ieee80211_key *key; 521 struct ether_header *eh; 522 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 523 uint8_t dir, type, subtype, qos; 524 uint8_t *bssid; 525 uint16_t rxseq; 526 527 if (m->m_flags & M_AMPDU_MPDU) { 528 /* 529 * Fastpath for A-MPDU reorder q resubmission. Frames 530 * w/ M_AMPDU_MPDU marked have already passed through 531 * here but were received out of order and been held on 532 * the reorder queue. When resubmitted they are marked 533 * with the M_AMPDU_MPDU flag and we can bypass most of 534 * the normal processing. 535 */ 536 wh = mtod(m, struct ieee80211_frame *); 537 type = IEEE80211_FC0_TYPE_DATA; 538 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 539 subtype = IEEE80211_FC0_SUBTYPE_QOS; 540 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 541 goto resubmit_ampdu; 542 } 543 544 KASSERT(ni != NULL, ("null node")); 545 ni->ni_inact = ni->ni_inact_reload; 546 547 type = -1; /* undefined */ 548 549 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 550 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 551 ni->ni_macaddr, NULL, 552 "too short (1): len %u", m->m_pkthdr.len); 553 vap->iv_stats.is_rx_tooshort++; 554 goto out; 555 } 556 /* 557 * Bit of a cheat here, we use a pointer for a 3-address 558 * frame format but don't reference fields past outside 559 * ieee80211_frame_min w/o first validating the data is 560 * present. 561 */ 562 wh = mtod(m, struct ieee80211_frame *); 563 564 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 565 IEEE80211_FC0_VERSION_0) { 566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 567 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 568 wh->i_fc[0], wh->i_fc[1]); 569 vap->iv_stats.is_rx_badversion++; 570 goto err; 571 } 572 573 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 574 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 575 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 576 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 577 bssid = wh->i_addr2; 578 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 579 /* not interested in */ 580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 581 bssid, NULL, "%s", "not to bss"); 582 vap->iv_stats.is_rx_wrongbss++; 583 goto out; 584 } 585 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 586 ni->ni_noise = nf; 587 if (HAS_SEQ(type) !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 588 uint8_t tid = ieee80211_gettid(wh); 589 if (IEEE80211_QOS_HAS_SEQ(wh) && 590 TID_TO_WME_AC(tid) >= WME_AC_VI) 591 ic->ic_wme.wme_hipri_traffic++; 592 rxseq = le16toh(*(uint16_t *)wh->i_seq); 593 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 594 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 595 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 596 /* duplicate, discard */ 597 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 598 bssid, "duplicate", 599 "seqno <%u,%u> fragno <%u,%u> tid %u", 600 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 601 ni->ni_rxseqs[tid] >> 602 IEEE80211_SEQ_SEQ_SHIFT, 603 rxseq & IEEE80211_SEQ_FRAG_MASK, 604 ni->ni_rxseqs[tid] & 605 IEEE80211_SEQ_FRAG_MASK, 606 tid); 607 vap->iv_stats.is_rx_dup++; 608 IEEE80211_NODE_STAT(ni, rx_dup); 609 goto out; 610 } 611 ni->ni_rxseqs[tid] = rxseq; 612 } 613 } 614 615 switch (type) { 616 case IEEE80211_FC0_TYPE_DATA: 617 hdrspace = ieee80211_hdrspace(ic, wh); 618 if (m->m_len < hdrspace && 619 (m = m_pullup(m, hdrspace)) == NULL) { 620 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 621 ni->ni_macaddr, NULL, 622 "data too short: expecting %u", hdrspace); 623 vap->iv_stats.is_rx_tooshort++; 624 goto out; /* XXX */ 625 } 626 /* 627 * Handle A-MPDU re-ordering. If the frame is to be 628 * processed directly then ieee80211_ampdu_reorder 629 * will return 0; otherwise it has consumed the mbuf 630 * and we should do nothing more with it. 631 */ 632 if ((m->m_flags & M_AMPDU) && 633 (dir == IEEE80211_FC1_DIR_FROMDS || 634 dir == IEEE80211_FC1_DIR_DSTODS) && 635 ieee80211_ampdu_reorder(ni, m) != 0) { 636 m = NULL; 637 goto out; 638 } 639 resubmit_ampdu: 640 if (dir == IEEE80211_FC1_DIR_FROMDS) { 641 if ((ifp->if_flags & IFF_SIMPLEX) && 642 isfromds_mcastecho(vap, wh)) { 643 /* 644 * In IEEE802.11 network, multicast 645 * packets sent from "me" are broadcast 646 * from the AP; silently discard for 647 * SIMPLEX interface. 648 */ 649 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 650 wh, "data", "%s", "multicast echo"); 651 vap->iv_stats.is_rx_mcastecho++; 652 goto out; 653 } 654 if ((vap->iv_flags & IEEE80211_F_DWDS) && 655 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 656 /* 657 * DWDS sta's must drop 3-address mcast frames 658 * as they will be sent separately as a 4-addr 659 * frame. Accepting the 3-addr frame will 660 * confuse the bridge into thinking the sending 661 * sta is located at the end of WDS link. 662 */ 663 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 664 "3-address data", "%s", "DWDS enabled"); 665 vap->iv_stats.is_rx_mcastecho++; 666 goto out; 667 } 668 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 669 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 670 IEEE80211_DISCARD(vap, 671 IEEE80211_MSG_INPUT, wh, "4-address data", 672 "%s", "DWDS not enabled"); 673 vap->iv_stats.is_rx_wrongdir++; 674 goto out; 675 } 676 if ((ifp->if_flags & IFF_SIMPLEX) && 677 isdstods_mcastecho(vap, wh)) { 678 /* 679 * In IEEE802.11 network, multicast 680 * packets sent from "me" are broadcast 681 * from the AP; silently discard for 682 * SIMPLEX interface. 683 */ 684 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 685 "4-address data", "%s", "multicast echo"); 686 vap->iv_stats.is_rx_mcastecho++; 687 goto out; 688 } 689 } else { 690 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 691 "data", "incorrect dir 0x%x", dir); 692 vap->iv_stats.is_rx_wrongdir++; 693 goto out; 694 } 695 696 /* 697 * Handle privacy requirements. Note that we 698 * must not be preempted from here until after 699 * we (potentially) call ieee80211_crypto_demic; 700 * otherwise we may violate assumptions in the 701 * crypto cipher modules used to do delayed update 702 * of replay sequence numbers. 703 */ 704 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 705 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 706 /* 707 * Discard encrypted frames when privacy is off. 708 */ 709 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 710 wh, "WEP", "%s", "PRIVACY off"); 711 vap->iv_stats.is_rx_noprivacy++; 712 IEEE80211_NODE_STAT(ni, rx_noprivacy); 713 goto out; 714 } 715 key = ieee80211_crypto_decap(ni, m, hdrspace); 716 if (key == NULL) { 717 /* NB: stats+msgs handled in crypto_decap */ 718 IEEE80211_NODE_STAT(ni, rx_wepfail); 719 goto out; 720 } 721 wh = mtod(m, struct ieee80211_frame *); 722 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 723 } else { 724 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 725 key = NULL; 726 } 727 728 /* 729 * Save QoS bits for use below--before we strip the header. 730 */ 731 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 732 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 733 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 734 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 735 } else 736 qos = 0; 737 738 /* 739 * Next up, any fragmentation. 740 */ 741 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 742 m = ieee80211_defrag(ni, m, hdrspace); 743 if (m == NULL) { 744 /* Fragment dropped or frame not complete yet */ 745 goto out; 746 } 747 } 748 wh = NULL; /* no longer valid, catch any uses */ 749 750 /* 751 * Next strip any MSDU crypto bits. 752 */ 753 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 754 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 755 ni->ni_macaddr, "data", "%s", "demic error"); 756 vap->iv_stats.is_rx_demicfail++; 757 IEEE80211_NODE_STAT(ni, rx_demicfail); 758 goto out; 759 } 760 761 /* copy to listener after decrypt */ 762 if (ieee80211_radiotap_active_vap(vap)) 763 ieee80211_radiotap_rx(vap, m); 764 need_tap = 0; 765 766 /* 767 * Finally, strip the 802.11 header. 768 */ 769 m = ieee80211_decap(vap, m, hdrspace); 770 if (m == NULL) { 771 /* XXX mask bit to check for both */ 772 /* don't count Null data frames as errors */ 773 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 774 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 775 goto out; 776 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 777 ni->ni_macaddr, "data", "%s", "decap error"); 778 vap->iv_stats.is_rx_decap++; 779 IEEE80211_NODE_STAT(ni, rx_decap); 780 goto err; 781 } 782 eh = mtod(m, struct ether_header *); 783 if (!ieee80211_node_is_authorized(ni)) { 784 /* 785 * Deny any non-PAE frames received prior to 786 * authorization. For open/shared-key 787 * authentication the port is mark authorized 788 * after authentication completes. For 802.1x 789 * the port is not marked authorized by the 790 * authenticator until the handshake has completed. 791 */ 792 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 793 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 794 eh->ether_shost, "data", 795 "unauthorized port: ether type 0x%x len %u", 796 eh->ether_type, m->m_pkthdr.len); 797 vap->iv_stats.is_rx_unauth++; 798 IEEE80211_NODE_STAT(ni, rx_unauth); 799 goto err; 800 } 801 } else { 802 /* 803 * When denying unencrypted frames, discard 804 * any non-PAE frames received without encryption. 805 */ 806 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 807 (key == NULL && (m->m_flags & M_WEP) == 0) && 808 eh->ether_type != htons(ETHERTYPE_PAE)) { 809 /* 810 * Drop unencrypted frames. 811 */ 812 vap->iv_stats.is_rx_unencrypted++; 813 IEEE80211_NODE_STAT(ni, rx_unencrypted); 814 goto out; 815 } 816 } 817 /* XXX require HT? */ 818 if (qos & IEEE80211_QOS_AMSDU) { 819 m = ieee80211_decap_amsdu(ni, m); 820 if (m == NULL) 821 return IEEE80211_FC0_TYPE_DATA; 822 } else { 823#ifdef IEEE80211_SUPPORT_SUPERG 824 m = ieee80211_decap_fastframe(vap, ni, m); 825 if (m == NULL) 826 return IEEE80211_FC0_TYPE_DATA; 827#endif 828 } 829 ieee80211_deliver_data(vap, ni, m); 830 return IEEE80211_FC0_TYPE_DATA; 831 832 case IEEE80211_FC0_TYPE_MGT: 833 vap->iv_stats.is_rx_mgmt++; 834 IEEE80211_NODE_STAT(ni, rx_mgmt); 835 if (dir != IEEE80211_FC1_DIR_NODS) { 836 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 837 wh, "data", "incorrect dir 0x%x", dir); 838 vap->iv_stats.is_rx_wrongdir++; 839 goto err; 840 } 841 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 842 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 843 ni->ni_macaddr, "mgt", "too short: len %u", 844 m->m_pkthdr.len); 845 vap->iv_stats.is_rx_tooshort++; 846 goto out; 847 } 848#ifdef IEEE80211_DEBUG 849 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 850 ieee80211_msg_dumppkts(vap)) { 851 if_printf(ifp, "received %s from %s rssi %d\n", 852 ieee80211_mgt_subtype_name[subtype >> 853 IEEE80211_FC0_SUBTYPE_SHIFT], 854 ether_sprintf(wh->i_addr2), rssi); 855 } 856#endif 857 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 858 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 859 /* 860 * Only shared key auth frames with a challenge 861 * should be encrypted, discard all others. 862 */ 863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 864 wh, ieee80211_mgt_subtype_name[subtype >> 865 IEEE80211_FC0_SUBTYPE_SHIFT], 866 "%s", "WEP set but not permitted"); 867 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 868 goto out; 869 } 870 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 871 /* 872 * Discard encrypted frames when privacy is off. 873 */ 874 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 875 wh, "mgt", "%s", "WEP set but PRIVACY off"); 876 vap->iv_stats.is_rx_noprivacy++; 877 goto out; 878 } 879 hdrspace = ieee80211_hdrspace(ic, wh); 880 key = ieee80211_crypto_decap(ni, m, hdrspace); 881 if (key == NULL) { 882 /* NB: stats+msgs handled in crypto_decap */ 883 goto out; 884 } 885 wh = mtod(m, struct ieee80211_frame *); 886 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 887 } 888 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 889 goto out; 890 891 case IEEE80211_FC0_TYPE_CTL: 892 vap->iv_stats.is_rx_ctl++; 893 IEEE80211_NODE_STAT(ni, rx_ctrl); 894 vap->iv_recv_ctl(ni, m, subtype); 895 goto out; 896 897 default: 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 899 wh, NULL, "bad frame type 0x%x", type); 900 /* should not come here */ 901 break; 902 } 903err: 904 ifp->if_ierrors++; 905out: 906 if (m != NULL) { 907 if (need_tap && ieee80211_radiotap_active_vap(vap)) 908 ieee80211_radiotap_rx(vap, m); 909 m_freem(m); 910 } 911 return type; 912#undef SEQ_LEQ 913} 914 915static void 916sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 917 int rssi, int nf, uint16_t seq, uint16_t status) 918{ 919 struct ieee80211vap *vap = ni->ni_vap; 920 921 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 922 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 923 ni->ni_macaddr, "open auth", 924 "bad sta auth mode %u", ni->ni_authmode); 925 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 926 return; 927 } 928 if (vap->iv_state != IEEE80211_S_AUTH || 929 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 930 vap->iv_stats.is_rx_bad_auth++; 931 return; 932 } 933 if (status != 0) { 934 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 935 ni, "open auth failed (reason %d)", status); 936 vap->iv_stats.is_rx_auth_fail++; 937 vap->iv_stats.is_rx_authfail_code = status; 938 ieee80211_new_state(vap, IEEE80211_S_SCAN, 939 IEEE80211_SCAN_FAIL_STATUS); 940 } else 941 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 942} 943 944static void 945sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 946 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 947 uint16_t seq, uint16_t status) 948{ 949 struct ieee80211vap *vap = ni->ni_vap; 950 uint8_t *challenge; 951 int estatus; 952 953 /* 954 * NB: this can happen as we allow pre-shared key 955 * authentication to be enabled w/o wep being turned 956 * on so that configuration of these can be done 957 * in any order. It may be better to enforce the 958 * ordering in which case this check would just be 959 * for sanity/consistency. 960 */ 961 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 962 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 963 ni->ni_macaddr, "shared key auth", 964 "%s", " PRIVACY is disabled"); 965 estatus = IEEE80211_STATUS_ALG; 966 goto bad; 967 } 968 /* 969 * Pre-shared key authentication is evil; accept 970 * it only if explicitly configured (it is supported 971 * mainly for compatibility with clients like OS X). 972 */ 973 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 974 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 975 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 976 ni->ni_macaddr, "shared key auth", 977 "bad sta auth mode %u", ni->ni_authmode); 978 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 979 estatus = IEEE80211_STATUS_ALG; 980 goto bad; 981 } 982 983 challenge = NULL; 984 if (frm + 1 < efrm) { 985 if ((frm[1] + 2) > (efrm - frm)) { 986 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 987 ni->ni_macaddr, "shared key auth", 988 "ie %d/%d too long", 989 frm[0], (frm[1] + 2) - (efrm - frm)); 990 vap->iv_stats.is_rx_bad_auth++; 991 estatus = IEEE80211_STATUS_CHALLENGE; 992 goto bad; 993 } 994 if (*frm == IEEE80211_ELEMID_CHALLENGE) 995 challenge = frm; 996 frm += frm[1] + 2; 997 } 998 switch (seq) { 999 case IEEE80211_AUTH_SHARED_CHALLENGE: 1000 case IEEE80211_AUTH_SHARED_RESPONSE: 1001 if (challenge == NULL) { 1002 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1003 ni->ni_macaddr, "shared key auth", 1004 "%s", "no challenge"); 1005 vap->iv_stats.is_rx_bad_auth++; 1006 estatus = IEEE80211_STATUS_CHALLENGE; 1007 goto bad; 1008 } 1009 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1010 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1011 ni->ni_macaddr, "shared key auth", 1012 "bad challenge len %d", challenge[1]); 1013 vap->iv_stats.is_rx_bad_auth++; 1014 estatus = IEEE80211_STATUS_CHALLENGE; 1015 goto bad; 1016 } 1017 default: 1018 break; 1019 } 1020 if (vap->iv_state != IEEE80211_S_AUTH) 1021 return; 1022 switch (seq) { 1023 case IEEE80211_AUTH_SHARED_PASS: 1024 if (ni->ni_challenge != NULL) { 1025 free(ni->ni_challenge, M_80211_NODE); 1026 ni->ni_challenge = NULL; 1027 } 1028 if (status != 0) { 1029 IEEE80211_NOTE_FRAME(vap, 1030 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1031 "shared key auth failed (reason %d)", status); 1032 vap->iv_stats.is_rx_auth_fail++; 1033 vap->iv_stats.is_rx_authfail_code = status; 1034 return; 1035 } 1036 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1037 break; 1038 case IEEE80211_AUTH_SHARED_CHALLENGE: 1039 if (!ieee80211_alloc_challenge(ni)) 1040 return; 1041 /* XXX could optimize by passing recvd challenge */ 1042 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1043 IEEE80211_SEND_MGMT(ni, 1044 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1045 break; 1046 default: 1047 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1048 wh, "shared key auth", "bad seq %d", seq); 1049 vap->iv_stats.is_rx_bad_auth++; 1050 return; 1051 } 1052 return; 1053bad: 1054 /* 1055 * Kick the state machine. This short-circuits 1056 * using the mgt frame timeout to trigger the 1057 * state transition. 1058 */ 1059 if (vap->iv_state == IEEE80211_S_AUTH) 1060 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1061 IEEE80211_SCAN_FAIL_STATUS); 1062} 1063 1064static int 1065ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1066 const struct ieee80211_frame *wh) 1067{ 1068#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1069 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1070 u_int len = frm[1], qosinfo; 1071 int i; 1072 1073 if (len < sizeof(struct ieee80211_wme_param)-2) { 1074 IEEE80211_DISCARD_IE(vap, 1075 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1076 wh, "WME", "too short, len %u", len); 1077 return -1; 1078 } 1079 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1080 qosinfo &= WME_QOSINFO_COUNT; 1081 /* XXX do proper check for wraparound */ 1082 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1083 return 0; 1084 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1085 for (i = 0; i < WME_NUM_AC; i++) { 1086 struct wmeParams *wmep = 1087 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1088 /* NB: ACI not used */ 1089 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1090 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1091 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1092 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1093 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1094 frm += 4; 1095 } 1096 wme->wme_wmeChanParams.cap_info = qosinfo; 1097 return 1; 1098#undef MS 1099} 1100 1101/* 1102 * Process 11h Channel Switch Announcement (CSA) ie. If this 1103 * is the first CSA then initiate the switch. Otherwise we 1104 * track state and trigger completion and/or cancel of the switch. 1105 * XXX should be public for IBSS use 1106 */ 1107static void 1108ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1109 const struct ieee80211_frame *wh) 1110{ 1111 struct ieee80211com *ic = vap->iv_ic; 1112 const struct ieee80211_csa_ie *csa = 1113 (const struct ieee80211_csa_ie *) frm; 1114 1115 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1116 ("state %s", ieee80211_state_name[vap->iv_state])); 1117 1118 if (csa->csa_mode > 1) { 1119 IEEE80211_DISCARD_IE(vap, 1120 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1121 wh, "CSA", "invalid mode %u", csa->csa_mode); 1122 return; 1123 } 1124 IEEE80211_LOCK(ic); 1125 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1126 /* 1127 * Convert the channel number to a channel reference. We 1128 * try first to preserve turbo attribute of the current 1129 * channel then fallback. Note this will not work if the 1130 * CSA specifies a channel that requires a band switch (e.g. 1131 * 11a => 11g). This is intentional as 11h is defined only 1132 * for 5GHz/11a and because the switch does not involve a 1133 * reassociation, protocol state (capabilities, negotated 1134 * rates, etc) may/will be wrong. 1135 */ 1136 struct ieee80211_channel *c = 1137 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1138 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1139 if (c == NULL) { 1140 c = ieee80211_find_channel_byieee(ic, 1141 csa->csa_newchan, 1142 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1143 if (c == NULL) { 1144 IEEE80211_DISCARD_IE(vap, 1145 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1146 wh, "CSA", "invalid channel %u", 1147 csa->csa_newchan); 1148 goto done; 1149 } 1150 } 1151#if IEEE80211_CSA_COUNT_MIN > 0 1152 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1153 /* 1154 * Require at least IEEE80211_CSA_COUNT_MIN count to 1155 * reduce the risk of being redirected by a fabricated 1156 * CSA. If a valid CSA is dropped we'll still get a 1157 * beacon miss when the AP leaves the channel so we'll 1158 * eventually follow to the new channel. 1159 * 1160 * NOTE: this violates the 11h spec that states that 1161 * count may be any value and if 0 then a switch 1162 * should happen asap. 1163 */ 1164 IEEE80211_DISCARD_IE(vap, 1165 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1166 wh, "CSA", "count %u too small, must be >= %u", 1167 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1168 goto done; 1169 } 1170#endif 1171 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1172 } else { 1173 /* 1174 * Validate this ie against the initial CSA. We require 1175 * mode and channel not change and the count must be 1176 * monotonically decreasing. This may be pointless and 1177 * canceling the switch as a result may be too paranoid but 1178 * in the worst case if we drop out of CSA because of this 1179 * and the AP does move then we'll just end up taking a 1180 * beacon miss and scan to find the AP. 1181 * 1182 * XXX may want <= on count as we also process ProbeResp 1183 * frames and those may come in w/ the same count as the 1184 * previous beacon; but doing so leaves us open to a stuck 1185 * count until we add a dead-man timer 1186 */ 1187 if (!(csa->csa_count < ic->ic_csa_count && 1188 csa->csa_mode == ic->ic_csa_mode && 1189 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1190 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1191 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1192 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1193 ic->ic_csa_newchan, ic->ic_csa_count, 1194 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1195 ieee80211_csa_cancelswitch(ic); 1196 } else { 1197 if (csa->csa_count <= 1) 1198 ieee80211_csa_completeswitch(ic); 1199 else 1200 ic->ic_csa_count = csa->csa_count; 1201 } 1202 } 1203done: 1204 IEEE80211_UNLOCK(ic); 1205} 1206 1207/* 1208 * Return non-zero if a background scan may be continued: 1209 * o bg scan is active 1210 * o no channel switch is pending 1211 * o there has not been any traffic recently 1212 * 1213 * Note we do not check if there is an administrative enable; 1214 * this is only done to start the scan. We assume that any 1215 * change in state will be accompanied by a request to cancel 1216 * active scans which will otherwise cause this test to fail. 1217 */ 1218static __inline int 1219contbgscan(struct ieee80211vap *vap) 1220{ 1221 struct ieee80211com *ic = vap->iv_ic; 1222 1223 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1224 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1225 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1226 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1227} 1228 1229/* 1230 * Return non-zero if a backgrond scan may be started: 1231 * o bg scanning is administratively enabled 1232 * o no channel switch is pending 1233 * o we are not boosted on a dynamic turbo channel 1234 * o there has not been a scan recently 1235 * o there has not been any traffic recently 1236 */ 1237static __inline int 1238startbgscan(struct ieee80211vap *vap) 1239{ 1240 struct ieee80211com *ic = vap->iv_ic; 1241 1242 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1243 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1244#ifdef IEEE80211_SUPPORT_SUPERG 1245 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1246#endif 1247 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1248 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1249} 1250 1251static void 1252sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1253 int subtype, int rssi, int nf) 1254{ 1255#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1256#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1257 struct ieee80211vap *vap = ni->ni_vap; 1258 struct ieee80211com *ic = ni->ni_ic; 1259 struct ieee80211_frame *wh; 1260 uint8_t *frm, *efrm; 1261 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1262 uint8_t rate; 1263 1264 wh = mtod(m0, struct ieee80211_frame *); 1265 frm = (uint8_t *)&wh[1]; 1266 efrm = mtod(m0, uint8_t *) + m0->m_len; 1267 switch (subtype) { 1268 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1269 case IEEE80211_FC0_SUBTYPE_BEACON: { 1270 struct ieee80211_scanparams scan; 1271 /* 1272 * We process beacon/probe response frames: 1273 * o when scanning, or 1274 * o station mode when associated (to collect state 1275 * updates such as 802.11g slot time) 1276 * Frames otherwise received are discarded. 1277 */ 1278 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1279 vap->iv_stats.is_rx_mgtdiscard++; 1280 return; 1281 } 1282 /* XXX probe response in sta mode when !scanning? */ 1283 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1284 return; 1285 /* 1286 * Count frame now that we know it's to be processed. 1287 */ 1288 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1289 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1290 IEEE80211_NODE_STAT(ni, rx_beacons); 1291 } else 1292 IEEE80211_NODE_STAT(ni, rx_proberesp); 1293 /* 1294 * When operating in station mode, check for state updates. 1295 * Be careful to ignore beacons received while doing a 1296 * background scan. We consider only 11g/WMM stuff right now. 1297 */ 1298 if (ni->ni_associd != 0 && 1299 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1300 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1301 /* record tsf of last beacon */ 1302 memcpy(ni->ni_tstamp.data, scan.tstamp, 1303 sizeof(ni->ni_tstamp)); 1304 /* count beacon frame for s/w bmiss handling */ 1305 vap->iv_swbmiss_count++; 1306 vap->iv_bmiss_count = 0; 1307 if (ni->ni_erp != scan.erp) { 1308 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1309 wh->i_addr2, 1310 "erp change: was 0x%x, now 0x%x", 1311 ni->ni_erp, scan.erp); 1312 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1313 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1314 ic->ic_flags |= IEEE80211_F_USEPROT; 1315 else 1316 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1317 ni->ni_erp = scan.erp; 1318 /* XXX statistic */ 1319 /* XXX driver notification */ 1320 } 1321 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1322 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1323 wh->i_addr2, 1324 "capabilities change: was 0x%x, now 0x%x", 1325 ni->ni_capinfo, scan.capinfo); 1326 /* 1327 * NB: we assume short preamble doesn't 1328 * change dynamically 1329 */ 1330 ieee80211_set_shortslottime(ic, 1331 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1332 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1333 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1334 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1335 /* XXX statistic */ 1336 } 1337 if (scan.wme != NULL && 1338 (ni->ni_flags & IEEE80211_NODE_QOS) && 1339 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1340 ieee80211_wme_updateparams(vap); 1341#ifdef IEEE80211_SUPPORT_SUPERG 1342 if (scan.ath != NULL) 1343 ieee80211_parse_athparams(ni, scan.ath, wh); 1344#endif 1345 if (scan.htcap != NULL && scan.htinfo != NULL && 1346 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1347 ieee80211_ht_updateparams(ni, 1348 scan.htcap, scan.htinfo); 1349 /* XXX state changes? */ 1350 } 1351 if (scan.tim != NULL) { 1352 struct ieee80211_tim_ie *tim = 1353 (struct ieee80211_tim_ie *) scan.tim; 1354#if 0 1355 int aid = IEEE80211_AID(ni->ni_associd); 1356 int ix = aid / NBBY; 1357 int min = tim->tim_bitctl &~ 1; 1358 int max = tim->tim_len + min - 4; 1359 if ((tim->tim_bitctl&1) || 1360 (min <= ix && ix <= max && 1361 isset(tim->tim_bitmap - min, aid))) { 1362 /* 1363 * XXX Do not let bg scan kick off 1364 * we are expecting data. 1365 */ 1366 ic->ic_lastdata = ticks; 1367 ieee80211_sta_pwrsave(vap, 0); 1368 } 1369#endif 1370 ni->ni_dtim_count = tim->tim_count; 1371 ni->ni_dtim_period = tim->tim_period; 1372 } 1373 if (scan.csa != NULL && 1374 (vap->iv_flags & IEEE80211_F_DOTH)) 1375 ieee80211_parse_csaparams(vap, scan.csa, wh); 1376 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1377 /* 1378 * No CSA ie or 11h disabled, but a channel 1379 * switch is pending; drop out so we aren't 1380 * stuck in CSA state. If the AP really is 1381 * moving we'll get a beacon miss and scan. 1382 */ 1383 IEEE80211_LOCK(ic); 1384 ieee80211_csa_cancelswitch(ic); 1385 IEEE80211_UNLOCK(ic); 1386 } 1387 /* 1388 * If scanning, pass the info to the scan module. 1389 * Otherwise, check if it's the right time to do 1390 * a background scan. Background scanning must 1391 * be enabled and we must not be operating in the 1392 * turbo phase of dynamic turbo mode. Then, 1393 * it's been a while since the last background 1394 * scan and if no data frames have come through 1395 * recently, kick off a scan. Note that this 1396 * is the mechanism by which a background scan 1397 * is started _and_ continued each time we 1398 * return on-channel to receive a beacon from 1399 * our ap. 1400 */ 1401 if (ic->ic_flags & IEEE80211_F_SCAN) { 1402 ieee80211_add_scan(vap, &scan, wh, 1403 subtype, rssi, nf); 1404 } else if (contbgscan(vap)) { 1405 ieee80211_bg_scan(vap, 0); 1406 } else if (startbgscan(vap)) { 1407 vap->iv_stats.is_scan_bg++; 1408#if 0 1409 /* wakeup if we are sleeing */ 1410 ieee80211_set_pwrsave(vap, 0); 1411#endif 1412 ieee80211_bg_scan(vap, 0); 1413 } 1414 return; 1415 } 1416 /* 1417 * If scanning, just pass information to the scan module. 1418 */ 1419 if (ic->ic_flags & IEEE80211_F_SCAN) { 1420 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1421 /* 1422 * Actively scanning a channel marked passive; 1423 * send a probe request now that we know there 1424 * is 802.11 traffic present. 1425 * 1426 * XXX check if the beacon we recv'd gives 1427 * us what we need and suppress the probe req 1428 */ 1429 ieee80211_probe_curchan(vap, 1); 1430 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1431 } 1432 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1433 return; 1434 } 1435 break; 1436 } 1437 1438 case IEEE80211_FC0_SUBTYPE_AUTH: { 1439 uint16_t algo, seq, status; 1440 /* 1441 * auth frame format 1442 * [2] algorithm 1443 * [2] sequence 1444 * [2] status 1445 * [tlv*] challenge 1446 */ 1447 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1448 algo = le16toh(*(uint16_t *)frm); 1449 seq = le16toh(*(uint16_t *)(frm + 2)); 1450 status = le16toh(*(uint16_t *)(frm + 4)); 1451 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1452 "recv auth frame with algorithm %d seq %d", algo, seq); 1453 1454 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1455 IEEE80211_DISCARD(vap, 1456 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1457 wh, "auth", "%s", "TKIP countermeasures enabled"); 1458 vap->iv_stats.is_rx_auth_countermeasures++; 1459 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1460 ieee80211_send_error(ni, wh->i_addr2, 1461 IEEE80211_FC0_SUBTYPE_AUTH, 1462 IEEE80211_REASON_MIC_FAILURE); 1463 } 1464 return; 1465 } 1466 if (algo == IEEE80211_AUTH_ALG_SHARED) 1467 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1468 seq, status); 1469 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1470 sta_auth_open(ni, wh, rssi, nf, seq, status); 1471 else { 1472 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1473 wh, "auth", "unsupported alg %d", algo); 1474 vap->iv_stats.is_rx_auth_unsupported++; 1475 return; 1476 } 1477 break; 1478 } 1479 1480 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1481 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1482 uint16_t capinfo, associd; 1483 uint16_t status; 1484 1485 if (vap->iv_state != IEEE80211_S_ASSOC) { 1486 vap->iv_stats.is_rx_mgtdiscard++; 1487 return; 1488 } 1489 1490 /* 1491 * asresp frame format 1492 * [2] capability information 1493 * [2] status 1494 * [2] association ID 1495 * [tlv] supported rates 1496 * [tlv] extended supported rates 1497 * [tlv] WME 1498 * [tlv] HT capabilities 1499 * [tlv] HT info 1500 */ 1501 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1502 ni = vap->iv_bss; 1503 capinfo = le16toh(*(uint16_t *)frm); 1504 frm += 2; 1505 status = le16toh(*(uint16_t *)frm); 1506 frm += 2; 1507 if (status != 0) { 1508 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1509 wh->i_addr2, "%sassoc failed (reason %d)", 1510 ISREASSOC(subtype) ? "re" : "", status); 1511 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1512 return; 1513 } 1514 associd = le16toh(*(uint16_t *)frm); 1515 frm += 2; 1516 1517 rates = xrates = wme = htcap = htinfo = NULL; 1518 while (efrm - frm > 1) { 1519 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1520 switch (*frm) { 1521 case IEEE80211_ELEMID_RATES: 1522 rates = frm; 1523 break; 1524 case IEEE80211_ELEMID_XRATES: 1525 xrates = frm; 1526 break; 1527 case IEEE80211_ELEMID_HTCAP: 1528 htcap = frm; 1529 break; 1530 case IEEE80211_ELEMID_HTINFO: 1531 htinfo = frm; 1532 break; 1533 case IEEE80211_ELEMID_VENDOR: 1534 if (iswmeoui(frm)) 1535 wme = frm; 1536 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1537 /* 1538 * Accept pre-draft HT ie's if the 1539 * standard ones have not been seen. 1540 */ 1541 if (ishtcapoui(frm)) { 1542 if (htcap == NULL) 1543 htcap = frm; 1544 } else if (ishtinfooui(frm)) { 1545 if (htinfo == NULL) 1546 htcap = frm; 1547 } 1548 } 1549 /* XXX Atheros OUI support */ 1550 break; 1551 } 1552 frm += frm[1] + 2; 1553 } 1554 1555 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1556 if (xrates != NULL) 1557 IEEE80211_VERIFY_ELEMENT(xrates, 1558 IEEE80211_RATE_MAXSIZE - rates[1], return); 1559 rate = ieee80211_setup_rates(ni, rates, xrates, 1560 IEEE80211_F_JOIN | 1561 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1562 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1563 if (rate & IEEE80211_RATE_BASIC) { 1564 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1565 wh->i_addr2, 1566 "%sassoc failed (rate set mismatch)", 1567 ISREASSOC(subtype) ? "re" : ""); 1568 vap->iv_stats.is_rx_assoc_norate++; 1569 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1570 IEEE80211_SCAN_FAIL_STATUS); 1571 return; 1572 } 1573 1574 ni->ni_capinfo = capinfo; 1575 ni->ni_associd = associd; 1576 if (ni->ni_jointime == 0) 1577 ni->ni_jointime = time_uptime; 1578 if (wme != NULL && 1579 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1580 ni->ni_flags |= IEEE80211_NODE_QOS; 1581 ieee80211_wme_updateparams(vap); 1582 } else 1583 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1584 /* 1585 * Setup HT state according to the negotiation. 1586 * 1587 * NB: shouldn't need to check if HT use is enabled but some 1588 * ap's send back HT ie's even when we don't indicate we 1589 * are HT capable in our AssocReq. 1590 */ 1591 if (htcap != NULL && htinfo != NULL && 1592 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1593 ieee80211_ht_node_init(ni); 1594 ieee80211_ht_updateparams(ni, htcap, htinfo); 1595 ieee80211_setup_htrates(ni, htcap, 1596 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1597 ieee80211_setup_basic_htrates(ni, htinfo); 1598 ieee80211_node_setuptxparms(ni); 1599 } else { 1600#ifdef IEEE80211_SUPPORT_SUPERG 1601 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1602 ieee80211_ff_node_init(ni); 1603#endif 1604 } 1605 /* 1606 * Configure state now that we are associated. 1607 * 1608 * XXX may need different/additional driver callbacks? 1609 */ 1610 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1611 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1612 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1613 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1614 } else { 1615 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1616 ic->ic_flags |= IEEE80211_F_USEBARKER; 1617 } 1618 ieee80211_set_shortslottime(ic, 1619 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1620 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1621 /* 1622 * Honor ERP protection. 1623 * 1624 * NB: ni_erp should zero for non-11g operation. 1625 */ 1626 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1627 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1628 ic->ic_flags |= IEEE80211_F_USEPROT; 1629 else 1630 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1631 IEEE80211_NOTE_MAC(vap, 1632 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1633 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1634 ISREASSOC(subtype) ? "re" : "", 1635 IEEE80211_NODE_AID(ni), 1636 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1637 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1638 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1639 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1640 ni->ni_flags & IEEE80211_NODE_HT ? 1641 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1642 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1643 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1644 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1645 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1646 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1647 ", fast-frames" : "", 1648 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1649 ", turbo" : "" 1650 ); 1651 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1652 break; 1653 } 1654 1655 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1656 uint16_t reason; 1657 1658 if (vap->iv_state == IEEE80211_S_SCAN) { 1659 vap->iv_stats.is_rx_mgtdiscard++; 1660 return; 1661 } 1662 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1663 /* NB: can happen when in promiscuous mode */ 1664 vap->iv_stats.is_rx_mgtdiscard++; 1665 break; 1666 } 1667 1668 /* 1669 * deauth frame format 1670 * [2] reason 1671 */ 1672 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1673 reason = le16toh(*(uint16_t *)frm); 1674 1675 vap->iv_stats.is_rx_deauth++; 1676 vap->iv_stats.is_rx_deauth_code = reason; 1677 IEEE80211_NODE_STAT(ni, rx_deauth); 1678 1679 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1680 "recv deauthenticate (reason %d)", reason); 1681 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1682 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1683 break; 1684 } 1685 1686 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1687 uint16_t reason; 1688 1689 if (vap->iv_state != IEEE80211_S_RUN && 1690 vap->iv_state != IEEE80211_S_ASSOC && 1691 vap->iv_state != IEEE80211_S_AUTH) { 1692 vap->iv_stats.is_rx_mgtdiscard++; 1693 return; 1694 } 1695 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1696 /* NB: can happen when in promiscuous mode */ 1697 vap->iv_stats.is_rx_mgtdiscard++; 1698 break; 1699 } 1700 1701 /* 1702 * disassoc frame format 1703 * [2] reason 1704 */ 1705 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1706 reason = le16toh(*(uint16_t *)frm); 1707 1708 vap->iv_stats.is_rx_disassoc++; 1709 vap->iv_stats.is_rx_disassoc_code = reason; 1710 IEEE80211_NODE_STAT(ni, rx_disassoc); 1711 1712 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1713 "recv disassociate (reason %d)", reason); 1714 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1715 break; 1716 } 1717 1718 case IEEE80211_FC0_SUBTYPE_ACTION: 1719 if (vap->iv_state == IEEE80211_S_RUN) { 1720 if (ieee80211_parse_action(ni, m0) == 0) 1721 ic->ic_recv_action(ni, wh, frm, efrm); 1722 } else 1723 vap->iv_stats.is_rx_mgtdiscard++; 1724 break; 1725 1726 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1727 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1728 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1729 vap->iv_stats.is_rx_mgtdiscard++; 1730 return; 1731 default: 1732 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1733 wh, "mgt", "subtype 0x%x not handled", subtype); 1734 vap->iv_stats.is_rx_badsubtype++; 1735 break; 1736 } 1737#undef ISREASSOC 1738#undef ISPROBE 1739} 1740 1741static void 1742sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1743{ 1744 switch (subtype) { 1745 case IEEE80211_FC0_SUBTYPE_BAR: 1746 ieee80211_recv_bar(ni, m); 1747 break; 1748 } 1749} 1750