ieee80211_sta.c revision 193439
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 193439 2009-06-04 15:57:38Z sam $"); 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 vap->iv_bmiss_count = 0; 145 vap->iv_stats.is_beacon_miss++; 146 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 147#ifdef IEEE80211_SUPPORT_SUPERG 148 struct ieee80211com *ic = vap->iv_ic; 149 150 /* 151 * If we receive a beacon miss interrupt when using 152 * dynamic turbo, attempt to switch modes before 153 * reassociating. 154 */ 155 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 156 ieee80211_dturbo_switch(vap, 157 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 158#endif 159 /* 160 * Try to reassociate before scanning for a new ap. 161 */ 162 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 163 } else { 164 /* 165 * Somebody else is controlling state changes (e.g. 166 * a user-mode app) don't do anything that would 167 * confuse them; just drop into scan mode so they'll 168 * notified of the state change and given control. 169 */ 170 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 171 } 172} 173 174/* 175 * Handle deauth with reason. We retry only for 176 * the cases where we might succeed. Otherwise 177 * we downgrade the ap and scan. 178 */ 179static void 180sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 181{ 182 switch (reason) { 183 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 184 case IEEE80211_STATUS_TIMEOUT: 185 case IEEE80211_REASON_ASSOC_EXPIRE: 186 case IEEE80211_REASON_NOT_AUTHED: 187 case IEEE80211_REASON_NOT_ASSOCED: 188 case IEEE80211_REASON_ASSOC_LEAVE: 189 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 190 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 191 break; 192 default: 193 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 194 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 195 ieee80211_check_scan_current(vap); 196 break; 197 } 198} 199 200/* 201 * IEEE80211_M_STA vap state machine handler. 202 * This routine handles the main states in the 802.11 protocol. 203 */ 204static int 205sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 206{ 207 struct ieee80211com *ic = vap->iv_ic; 208 struct ieee80211_node *ni; 209 enum ieee80211_state ostate; 210 211 IEEE80211_LOCK_ASSERT(ic); 212 213 ostate = vap->iv_state; 214 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 215 __func__, ieee80211_state_name[ostate], 216 ieee80211_state_name[nstate], arg); 217 vap->iv_state = nstate; /* state transition */ 218 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 219 if (ostate != IEEE80211_S_SCAN) 220 ieee80211_cancel_scan(vap); /* background scan */ 221 ni = vap->iv_bss; /* NB: no reference held */ 222 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 223 callout_stop(&vap->iv_swbmiss); 224 switch (nstate) { 225 case IEEE80211_S_INIT: 226 switch (ostate) { 227 case IEEE80211_S_SLEEP: 228 /* XXX wakeup */ 229 case IEEE80211_S_RUN: 230 IEEE80211_SEND_MGMT(ni, 231 IEEE80211_FC0_SUBTYPE_DISASSOC, 232 IEEE80211_REASON_ASSOC_LEAVE); 233 ieee80211_sta_leave(ni); 234 break; 235 case IEEE80211_S_ASSOC: 236 IEEE80211_SEND_MGMT(ni, 237 IEEE80211_FC0_SUBTYPE_DEAUTH, 238 IEEE80211_REASON_AUTH_LEAVE); 239 break; 240 case IEEE80211_S_SCAN: 241 ieee80211_cancel_scan(vap); 242 break; 243 default: 244 goto invalid; 245 } 246 if (ostate != IEEE80211_S_INIT) { 247 /* NB: optimize INIT -> INIT case */ 248 ieee80211_reset_bss(vap); 249 } 250 if (vap->iv_auth->ia_detach != NULL) 251 vap->iv_auth->ia_detach(vap); 252 break; 253 case IEEE80211_S_SCAN: 254 switch (ostate) { 255 case IEEE80211_S_INIT: 256 /* 257 * Initiate a scan. We can come here as a result 258 * of an IEEE80211_IOC_SCAN_REQ too in which case 259 * the vap will be marked with IEEE80211_FEXT_SCANREQ 260 * and the scan request parameters will be present 261 * in iv_scanreq. Otherwise we do the default. 262 */ 263 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 264 ieee80211_check_scan(vap, 265 vap->iv_scanreq_flags, 266 vap->iv_scanreq_duration, 267 vap->iv_scanreq_mindwell, 268 vap->iv_scanreq_maxdwell, 269 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 270 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 271 } else 272 ieee80211_check_scan_current(vap); 273 break; 274 case IEEE80211_S_SCAN: 275 case IEEE80211_S_AUTH: 276 case IEEE80211_S_ASSOC: 277 /* 278 * These can happen either because of a timeout 279 * on an assoc/auth response or because of a 280 * change in state that requires a reset. For 281 * the former we're called with a non-zero arg 282 * that is the cause for the failure; pass this 283 * to the scan code so it can update state. 284 * Otherwise trigger a new scan unless we're in 285 * manual roaming mode in which case an application 286 * must issue an explicit scan request. 287 */ 288 if (arg != 0) 289 ieee80211_scan_assoc_fail(vap, 290 vap->iv_bss->ni_macaddr, arg); 291 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 292 ieee80211_check_scan_current(vap); 293 break; 294 case IEEE80211_S_RUN: /* beacon miss */ 295 /* 296 * Beacon miss. Notify user space and if not 297 * under control of a user application (roaming 298 * manual) kick off a scan to re-connect. 299 */ 300 ieee80211_sta_leave(ni); 301 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 302 ieee80211_check_scan_current(vap); 303 break; 304 default: 305 goto invalid; 306 } 307 break; 308 case IEEE80211_S_AUTH: 309 switch (ostate) { 310 case IEEE80211_S_INIT: 311 case IEEE80211_S_SCAN: 312 IEEE80211_SEND_MGMT(ni, 313 IEEE80211_FC0_SUBTYPE_AUTH, 1); 314 break; 315 case IEEE80211_S_AUTH: 316 case IEEE80211_S_ASSOC: 317 switch (arg & 0xff) { 318 case IEEE80211_FC0_SUBTYPE_AUTH: 319 /* ??? */ 320 IEEE80211_SEND_MGMT(ni, 321 IEEE80211_FC0_SUBTYPE_AUTH, 2); 322 break; 323 case IEEE80211_FC0_SUBTYPE_DEAUTH: 324 sta_authretry(vap, ni, arg>>8); 325 break; 326 } 327 break; 328 case IEEE80211_S_RUN: 329 switch (arg & 0xff) { 330 case IEEE80211_FC0_SUBTYPE_AUTH: 331 IEEE80211_SEND_MGMT(ni, 332 IEEE80211_FC0_SUBTYPE_AUTH, 2); 333 vap->iv_state = ostate; /* stay RUN */ 334 break; 335 case IEEE80211_FC0_SUBTYPE_DEAUTH: 336 ieee80211_sta_leave(ni); 337 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 338 /* try to reauth */ 339 IEEE80211_SEND_MGMT(ni, 340 IEEE80211_FC0_SUBTYPE_AUTH, 1); 341 } 342 break; 343 } 344 break; 345 default: 346 goto invalid; 347 } 348 break; 349 case IEEE80211_S_ASSOC: 350 switch (ostate) { 351 case IEEE80211_S_AUTH: 352 case IEEE80211_S_ASSOC: 353 IEEE80211_SEND_MGMT(ni, 354 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 355 break; 356 case IEEE80211_S_SLEEP: /* cannot happen */ 357 case IEEE80211_S_RUN: 358 ieee80211_sta_leave(ni); 359 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 360 IEEE80211_SEND_MGMT(ni, arg ? 361 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 362 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 363 } 364 break; 365 default: 366 goto invalid; 367 } 368 break; 369 case IEEE80211_S_RUN: 370 if (vap->iv_flags & IEEE80211_F_WPA) { 371 /* XXX validate prerequisites */ 372 } 373 switch (ostate) { 374 case IEEE80211_S_RUN: 375 case IEEE80211_S_CSA: 376 break; 377 case IEEE80211_S_AUTH: /* when join is done in fw */ 378 case IEEE80211_S_ASSOC: 379#ifdef IEEE80211_DEBUG 380 if (ieee80211_msg_debug(vap)) { 381 ieee80211_note(vap, "%s with %s ssid ", 382 (vap->iv_opmode == IEEE80211_M_STA ? 383 "associated" : "synchronized"), 384 ether_sprintf(ni->ni_bssid)); 385 ieee80211_print_essid(vap->iv_bss->ni_essid, 386 ni->ni_esslen); 387 /* XXX MCS/HT */ 388 printf(" channel %d start %uMb\n", 389 ieee80211_chan2ieee(ic, ic->ic_curchan), 390 IEEE80211_RATE2MBS(ni->ni_txrate)); 391 } 392#endif 393 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 394 ieee80211_notify_node_join(ni, 395 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 396 break; 397 case IEEE80211_S_SLEEP: 398 ieee80211_sta_pwrsave(vap, 0); 399 break; 400 default: 401 goto invalid; 402 } 403 ieee80211_sync_curchan(ic); 404 if (ostate != IEEE80211_S_RUN && 405 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 406 /* 407 * Start s/w beacon miss timer for devices w/o 408 * hardware support. We fudge a bit here since 409 * we're doing this in software. 410 */ 411 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 412 2 * vap->iv_bmissthreshold * ni->ni_intval); 413 vap->iv_swbmiss_count = 0; 414 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 415 ieee80211_swbmiss, vap); 416 } 417 /* 418 * When 802.1x is not in use mark the port authorized 419 * at this point so traffic can flow. 420 */ 421 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 422 ieee80211_node_authorize(ni); 423 /* 424 * Fake association when joining an existing bss. 425 */ 426 if (ic->ic_newassoc != NULL) 427 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 428 break; 429 case IEEE80211_S_CSA: 430 if (ostate != IEEE80211_S_RUN) 431 goto invalid; 432 break; 433 case IEEE80211_S_SLEEP: 434 ieee80211_sta_pwrsave(vap, 0); 435 break; 436 default: 437 invalid: 438 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 439 "%s: unexpected state transition %s -> %s\n", __func__, 440 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 441 break; 442 } 443 return 0; 444} 445 446/* 447 * Return non-zero if the frame is an echo of a multicast 448 * frame sent by ourself. The dir is known to be DSTODS. 449 */ 450static __inline int 451isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 452{ 453#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 454#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 455 const uint8_t *sa; 456 457 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 458 459 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 460 return 0; 461 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 462 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 463#undef WH4 464#undef QWH4 465} 466 467/* 468 * Return non-zero if the frame is an echo of a multicast 469 * frame sent by ourself. The dir is known to be FROMDS. 470 */ 471static __inline int 472isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 473{ 474 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 475 476 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 477 return 0; 478 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 479} 480 481/* 482 * Decide if a received management frame should be 483 * printed when debugging is enabled. This filters some 484 * of the less interesting frames that come frequently 485 * (e.g. beacons). 486 */ 487static __inline int 488doprint(struct ieee80211vap *vap, int subtype) 489{ 490 switch (subtype) { 491 case IEEE80211_FC0_SUBTYPE_BEACON: 492 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 493 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 494 return 0; 495 } 496 return 1; 497} 498 499/* 500 * Process a received frame. The node associated with the sender 501 * should be supplied. If nothing was found in the node table then 502 * the caller is assumed to supply a reference to iv_bss instead. 503 * The RSSI and a timestamp are also supplied. The RSSI data is used 504 * during AP scanning to select a AP to associate with; it can have 505 * any units so long as values have consistent units and higher values 506 * mean ``better signal''. The receive timestamp is currently not used 507 * by the 802.11 layer. 508 */ 509static int 510sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 511{ 512#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 513#define HAS_SEQ(type) ((type & 0x4) == 0) 514 struct ieee80211vap *vap = ni->ni_vap; 515 struct ieee80211com *ic = ni->ni_ic; 516 struct ifnet *ifp = vap->iv_ifp; 517 struct ieee80211_frame *wh; 518 struct ieee80211_key *key; 519 struct ether_header *eh; 520 int hdrspace, need_tap; 521 uint8_t dir, type, subtype, qos; 522 uint8_t *bssid; 523 uint16_t rxseq; 524 525 if (m->m_flags & M_AMPDU_MPDU) { 526 /* 527 * Fastpath for A-MPDU reorder q resubmission. Frames 528 * w/ M_AMPDU_MPDU marked have already passed through 529 * here but were received out of order and been held on 530 * the reorder queue. When resubmitted they are marked 531 * with the M_AMPDU_MPDU flag and we can bypass most of 532 * the normal processing. 533 */ 534 wh = mtod(m, struct ieee80211_frame *); 535 type = IEEE80211_FC0_TYPE_DATA; 536 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 537 subtype = IEEE80211_FC0_SUBTYPE_QOS; 538 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 539 goto resubmit_ampdu; 540 } 541 542 KASSERT(ni != NULL, ("null node")); 543 ni->ni_inact = ni->ni_inact_reload; 544 545 need_tap = 1; /* mbuf need to be tapped. */ 546 type = -1; /* undefined */ 547 548 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 549 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 550 ni->ni_macaddr, NULL, 551 "too short (1): len %u", m->m_pkthdr.len); 552 vap->iv_stats.is_rx_tooshort++; 553 goto out; 554 } 555 /* 556 * Bit of a cheat here, we use a pointer for a 3-address 557 * frame format but don't reference fields past outside 558 * ieee80211_frame_min w/o first validating the data is 559 * present. 560 */ 561 wh = mtod(m, struct ieee80211_frame *); 562 563 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 564 IEEE80211_FC0_VERSION_0) { 565 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 566 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 567 wh->i_fc[0], wh->i_fc[1]); 568 vap->iv_stats.is_rx_badversion++; 569 goto err; 570 } 571 572 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 573 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 574 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 575 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 576 bssid = wh->i_addr2; 577 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 578 /* not interested in */ 579 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 580 bssid, NULL, "%s", "not to bss"); 581 vap->iv_stats.is_rx_wrongbss++; 582 goto out; 583 } 584 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 585 ni->ni_noise = nf; 586 if (HAS_SEQ(type)) { 587 uint8_t tid = ieee80211_gettid(wh); 588 if (IEEE80211_QOS_HAS_SEQ(wh) && 589 TID_TO_WME_AC(tid) >= WME_AC_VI) 590 ic->ic_wme.wme_hipri_traffic++; 591 rxseq = le16toh(*(uint16_t *)wh->i_seq); 592 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 593 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 594 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 595 /* duplicate, discard */ 596 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 597 bssid, "duplicate", 598 "seqno <%u,%u> fragno <%u,%u> tid %u", 599 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 600 ni->ni_rxseqs[tid] >> 601 IEEE80211_SEQ_SEQ_SHIFT, 602 rxseq & IEEE80211_SEQ_FRAG_MASK, 603 ni->ni_rxseqs[tid] & 604 IEEE80211_SEQ_FRAG_MASK, 605 tid); 606 vap->iv_stats.is_rx_dup++; 607 IEEE80211_NODE_STAT(ni, rx_dup); 608 goto out; 609 } 610 ni->ni_rxseqs[tid] = rxseq; 611 } 612 } 613 614 switch (type) { 615 case IEEE80211_FC0_TYPE_DATA: 616 hdrspace = ieee80211_hdrspace(ic, wh); 617 if (m->m_len < hdrspace && 618 (m = m_pullup(m, hdrspace)) == NULL) { 619 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 620 ni->ni_macaddr, NULL, 621 "data too short: expecting %u", hdrspace); 622 vap->iv_stats.is_rx_tooshort++; 623 goto out; /* XXX */ 624 } 625 /* 626 * Handle A-MPDU re-ordering. If the frame is to be 627 * processed directly then ieee80211_ampdu_reorder 628 * will return 0; otherwise it has consumed the mbuf 629 * and we should do nothing more with it. 630 */ 631 if ((m->m_flags & M_AMPDU) && 632 (dir == IEEE80211_FC1_DIR_FROMDS || 633 dir == IEEE80211_FC1_DIR_DSTODS) && 634 ieee80211_ampdu_reorder(ni, m) != 0) { 635 m = NULL; 636 goto out; 637 } 638 resubmit_ampdu: 639 if (dir == IEEE80211_FC1_DIR_FROMDS) { 640 if ((ifp->if_flags & IFF_SIMPLEX) && 641 isfromds_mcastecho(vap, wh)) { 642 /* 643 * In IEEE802.11 network, multicast 644 * packets sent from "me" are broadcast 645 * from the AP; silently discard for 646 * SIMPLEX interface. 647 */ 648 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 649 wh, "data", "%s", "multicast echo"); 650 vap->iv_stats.is_rx_mcastecho++; 651 goto out; 652 } 653 if ((vap->iv_flags & IEEE80211_F_DWDS) && 654 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 655 /* 656 * DWDS sta's must drop 3-address mcast frames 657 * as they will be sent separately as a 4-addr 658 * frame. Accepting the 3-addr frame will 659 * confuse the bridge into thinking the sending 660 * sta is located at the end of WDS link. 661 */ 662 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 663 "3-address data", "%s", "DWDS enabled"); 664 vap->iv_stats.is_rx_mcastecho++; 665 goto out; 666 } 667 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 668 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 669 IEEE80211_DISCARD(vap, 670 IEEE80211_MSG_INPUT, wh, "4-address data", 671 "%s", "DWDS not enabled"); 672 vap->iv_stats.is_rx_wrongdir++; 673 goto out; 674 } 675 if ((ifp->if_flags & IFF_SIMPLEX) && 676 isdstods_mcastecho(vap, wh)) { 677 /* 678 * In IEEE802.11 network, multicast 679 * packets sent from "me" are broadcast 680 * from the AP; silently discard for 681 * SIMPLEX interface. 682 */ 683 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 684 "4-address data", "%s", "multicast echo"); 685 vap->iv_stats.is_rx_mcastecho++; 686 goto out; 687 } 688 } else { 689 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 690 "data", "incorrect dir 0x%x", dir); 691 vap->iv_stats.is_rx_wrongdir++; 692 goto out; 693 } 694 695 /* 696 * Handle privacy requirements. Note that we 697 * must not be preempted from here until after 698 * we (potentially) call ieee80211_crypto_demic; 699 * otherwise we may violate assumptions in the 700 * crypto cipher modules used to do delayed update 701 * of replay sequence numbers. 702 */ 703 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 704 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 705 /* 706 * Discard encrypted frames when privacy is off. 707 */ 708 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 709 wh, "WEP", "%s", "PRIVACY off"); 710 vap->iv_stats.is_rx_noprivacy++; 711 IEEE80211_NODE_STAT(ni, rx_noprivacy); 712 goto out; 713 } 714 key = ieee80211_crypto_decap(ni, m, hdrspace); 715 if (key == NULL) { 716 /* NB: stats+msgs handled in crypto_decap */ 717 IEEE80211_NODE_STAT(ni, rx_wepfail); 718 goto out; 719 } 720 wh = mtod(m, struct ieee80211_frame *); 721 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 722 } else { 723 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 724 key = NULL; 725 } 726 727 /* 728 * Save QoS bits for use below--before we strip the header. 729 */ 730 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 731 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 732 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 733 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 734 } else 735 qos = 0; 736 737 /* 738 * Next up, any fragmentation. 739 */ 740 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 741 m = ieee80211_defrag(ni, m, hdrspace); 742 if (m == NULL) { 743 /* Fragment dropped or frame not complete yet */ 744 goto out; 745 } 746 } 747 wh = NULL; /* no longer valid, catch any uses */ 748 749 /* 750 * Next strip any MSDU crypto bits. 751 */ 752 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 753 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 754 ni->ni_macaddr, "data", "%s", "demic error"); 755 vap->iv_stats.is_rx_demicfail++; 756 IEEE80211_NODE_STAT(ni, rx_demicfail); 757 goto out; 758 } 759 760 /* copy to listener after decrypt */ 761 if (ieee80211_radiotap_active_vap(vap)) 762 ieee80211_radiotap_tx(vap, m); 763 need_tap = 0; 764 765 /* 766 * Finally, strip the 802.11 header. 767 */ 768 m = ieee80211_decap(vap, m, hdrspace); 769 if (m == NULL) { 770 /* XXX mask bit to check for both */ 771 /* don't count Null data frames as errors */ 772 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 773 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 774 goto out; 775 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 776 ni->ni_macaddr, "data", "%s", "decap error"); 777 vap->iv_stats.is_rx_decap++; 778 IEEE80211_NODE_STAT(ni, rx_decap); 779 goto err; 780 } 781 eh = mtod(m, struct ether_header *); 782 if (!ieee80211_node_is_authorized(ni)) { 783 /* 784 * Deny any non-PAE frames received prior to 785 * authorization. For open/shared-key 786 * authentication the port is mark authorized 787 * after authentication completes. For 802.1x 788 * the port is not marked authorized by the 789 * authenticator until the handshake has completed. 790 */ 791 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 792 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 793 eh->ether_shost, "data", 794 "unauthorized port: ether type 0x%x len %u", 795 eh->ether_type, m->m_pkthdr.len); 796 vap->iv_stats.is_rx_unauth++; 797 IEEE80211_NODE_STAT(ni, rx_unauth); 798 goto err; 799 } 800 } else { 801 /* 802 * When denying unencrypted frames, discard 803 * any non-PAE frames received without encryption. 804 */ 805 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 806 (key == NULL && (m->m_flags & M_WEP) == 0) && 807 eh->ether_type != htons(ETHERTYPE_PAE)) { 808 /* 809 * Drop unencrypted frames. 810 */ 811 vap->iv_stats.is_rx_unencrypted++; 812 IEEE80211_NODE_STAT(ni, rx_unencrypted); 813 goto out; 814 } 815 } 816 /* XXX require HT? */ 817 if (qos & IEEE80211_QOS_AMSDU) { 818 m = ieee80211_decap_amsdu(ni, m); 819 if (m == NULL) 820 return IEEE80211_FC0_TYPE_DATA; 821 } else { 822#ifdef IEEE80211_SUPPORT_SUPERG 823 m = ieee80211_decap_fastframe(vap, ni, m); 824 if (m == NULL) 825 return IEEE80211_FC0_TYPE_DATA; 826#endif 827 } 828 ieee80211_deliver_data(vap, ni, m); 829 return IEEE80211_FC0_TYPE_DATA; 830 831 case IEEE80211_FC0_TYPE_MGT: 832 vap->iv_stats.is_rx_mgmt++; 833 IEEE80211_NODE_STAT(ni, rx_mgmt); 834 if (dir != IEEE80211_FC1_DIR_NODS) { 835 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 836 wh, "data", "incorrect dir 0x%x", dir); 837 vap->iv_stats.is_rx_wrongdir++; 838 goto err; 839 } 840 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 841 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 842 ni->ni_macaddr, "mgt", "too short: len %u", 843 m->m_pkthdr.len); 844 vap->iv_stats.is_rx_tooshort++; 845 goto out; 846 } 847#ifdef IEEE80211_DEBUG 848 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 849 ieee80211_msg_dumppkts(vap)) { 850 if_printf(ifp, "received %s from %s rssi %d\n", 851 ieee80211_mgt_subtype_name[subtype >> 852 IEEE80211_FC0_SUBTYPE_SHIFT], 853 ether_sprintf(wh->i_addr2), rssi); 854 } 855#endif 856 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 858 /* 859 * Only shared key auth frames with a challenge 860 * should be encrypted, discard all others. 861 */ 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, ieee80211_mgt_subtype_name[subtype >> 864 IEEE80211_FC0_SUBTYPE_SHIFT], 865 "%s", "WEP set but not permitted"); 866 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 867 goto out; 868 } 869 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 870 /* 871 * Discard encrypted frames when privacy is off. 872 */ 873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 874 wh, "mgt", "%s", "WEP set but PRIVACY off"); 875 vap->iv_stats.is_rx_noprivacy++; 876 goto out; 877 } 878 hdrspace = ieee80211_hdrspace(ic, wh); 879 key = ieee80211_crypto_decap(ni, m, hdrspace); 880 if (key == NULL) { 881 /* NB: stats+msgs handled in crypto_decap */ 882 goto out; 883 } 884 wh = mtod(m, struct ieee80211_frame *); 885 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 886 } 887 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 888 goto out; 889 890 case IEEE80211_FC0_TYPE_CTL: 891 vap->iv_stats.is_rx_ctl++; 892 IEEE80211_NODE_STAT(ni, rx_ctrl); 893 vap->iv_recv_ctl(ni, m, subtype); 894 goto out; 895 896 default: 897 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 898 wh, NULL, "bad frame type 0x%x", type); 899 /* should not come here */ 900 break; 901 } 902err: 903 ifp->if_ierrors++; 904out: 905 if (m != NULL) { 906 if (need_tap && ieee80211_radiotap_active_vap(vap)) 907 ieee80211_radiotap_rx(vap, m); 908 m_freem(m); 909 } 910 return type; 911#undef SEQ_LEQ 912} 913 914static void 915sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 916 int rssi, int nf, uint16_t seq, uint16_t status) 917{ 918 struct ieee80211vap *vap = ni->ni_vap; 919 920 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 921 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 922 ni->ni_macaddr, "open auth", 923 "bad sta auth mode %u", ni->ni_authmode); 924 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 925 return; 926 } 927 if (vap->iv_state != IEEE80211_S_AUTH || 928 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 929 vap->iv_stats.is_rx_bad_auth++; 930 return; 931 } 932 if (status != 0) { 933 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 934 ni, "open auth failed (reason %d)", status); 935 vap->iv_stats.is_rx_auth_fail++; 936 vap->iv_stats.is_rx_authfail_code = status; 937 ieee80211_new_state(vap, IEEE80211_S_SCAN, 938 IEEE80211_SCAN_FAIL_STATUS); 939 } else 940 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 941} 942 943static void 944sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 945 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 946 uint16_t seq, uint16_t status) 947{ 948 struct ieee80211vap *vap = ni->ni_vap; 949 uint8_t *challenge; 950 int estatus; 951 952 /* 953 * NB: this can happen as we allow pre-shared key 954 * authentication to be enabled w/o wep being turned 955 * on so that configuration of these can be done 956 * in any order. It may be better to enforce the 957 * ordering in which case this check would just be 958 * for sanity/consistency. 959 */ 960 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 961 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 962 ni->ni_macaddr, "shared key auth", 963 "%s", " PRIVACY is disabled"); 964 estatus = IEEE80211_STATUS_ALG; 965 goto bad; 966 } 967 /* 968 * Pre-shared key authentication is evil; accept 969 * it only if explicitly configured (it is supported 970 * mainly for compatibility with clients like OS X). 971 */ 972 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 973 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 974 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 975 ni->ni_macaddr, "shared key auth", 976 "bad sta auth mode %u", ni->ni_authmode); 977 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 978 estatus = IEEE80211_STATUS_ALG; 979 goto bad; 980 } 981 982 challenge = NULL; 983 if (frm + 1 < efrm) { 984 if ((frm[1] + 2) > (efrm - frm)) { 985 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 986 ni->ni_macaddr, "shared key auth", 987 "ie %d/%d too long", 988 frm[0], (frm[1] + 2) - (efrm - frm)); 989 vap->iv_stats.is_rx_bad_auth++; 990 estatus = IEEE80211_STATUS_CHALLENGE; 991 goto bad; 992 } 993 if (*frm == IEEE80211_ELEMID_CHALLENGE) 994 challenge = frm; 995 frm += frm[1] + 2; 996 } 997 switch (seq) { 998 case IEEE80211_AUTH_SHARED_CHALLENGE: 999 case IEEE80211_AUTH_SHARED_RESPONSE: 1000 if (challenge == NULL) { 1001 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1002 ni->ni_macaddr, "shared key auth", 1003 "%s", "no challenge"); 1004 vap->iv_stats.is_rx_bad_auth++; 1005 estatus = IEEE80211_STATUS_CHALLENGE; 1006 goto bad; 1007 } 1008 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1009 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1010 ni->ni_macaddr, "shared key auth", 1011 "bad challenge len %d", challenge[1]); 1012 vap->iv_stats.is_rx_bad_auth++; 1013 estatus = IEEE80211_STATUS_CHALLENGE; 1014 goto bad; 1015 } 1016 default: 1017 break; 1018 } 1019 if (vap->iv_state != IEEE80211_S_AUTH) 1020 return; 1021 switch (seq) { 1022 case IEEE80211_AUTH_SHARED_PASS: 1023 if (ni->ni_challenge != NULL) { 1024 free(ni->ni_challenge, M_80211_NODE); 1025 ni->ni_challenge = NULL; 1026 } 1027 if (status != 0) { 1028 IEEE80211_NOTE_FRAME(vap, 1029 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1030 "shared key auth failed (reason %d)", status); 1031 vap->iv_stats.is_rx_auth_fail++; 1032 vap->iv_stats.is_rx_authfail_code = status; 1033 return; 1034 } 1035 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1036 break; 1037 case IEEE80211_AUTH_SHARED_CHALLENGE: 1038 if (!ieee80211_alloc_challenge(ni)) 1039 return; 1040 /* XXX could optimize by passing recvd challenge */ 1041 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1042 IEEE80211_SEND_MGMT(ni, 1043 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1044 break; 1045 default: 1046 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1047 wh, "shared key auth", "bad seq %d", seq); 1048 vap->iv_stats.is_rx_bad_auth++; 1049 return; 1050 } 1051 return; 1052bad: 1053 /* 1054 * Kick the state machine. This short-circuits 1055 * using the mgt frame timeout to trigger the 1056 * state transition. 1057 */ 1058 if (vap->iv_state == IEEE80211_S_AUTH) 1059 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1060 IEEE80211_SCAN_FAIL_STATUS); 1061} 1062 1063static int 1064ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1065 const struct ieee80211_frame *wh) 1066{ 1067#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1068 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1069 u_int len = frm[1], qosinfo; 1070 int i; 1071 1072 if (len < sizeof(struct ieee80211_wme_param)-2) { 1073 IEEE80211_DISCARD_IE(vap, 1074 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1075 wh, "WME", "too short, len %u", len); 1076 return -1; 1077 } 1078 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1079 qosinfo &= WME_QOSINFO_COUNT; 1080 /* XXX do proper check for wraparound */ 1081 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1082 return 0; 1083 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1084 for (i = 0; i < WME_NUM_AC; i++) { 1085 struct wmeParams *wmep = 1086 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1087 /* NB: ACI not used */ 1088 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1089 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1090 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1091 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1092 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1093 frm += 4; 1094 } 1095 wme->wme_wmeChanParams.cap_info = qosinfo; 1096 return 1; 1097#undef MS 1098} 1099 1100/* 1101 * Process 11h Channel Switch Announcement (CSA) ie. If this 1102 * is the first CSA then initiate the switch. Otherwise we 1103 * track state and trigger completion and/or cancel of the switch. 1104 * XXX should be public for IBSS use 1105 */ 1106static void 1107ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1108 const struct ieee80211_frame *wh) 1109{ 1110 struct ieee80211com *ic = vap->iv_ic; 1111 const struct ieee80211_csa_ie *csa = 1112 (const struct ieee80211_csa_ie *) frm; 1113 1114 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1115 ("state %s", ieee80211_state_name[vap->iv_state])); 1116 1117 if (csa->csa_mode > 1) { 1118 IEEE80211_DISCARD_IE(vap, 1119 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1120 wh, "CSA", "invalid mode %u", csa->csa_mode); 1121 return; 1122 } 1123 IEEE80211_LOCK(ic); 1124 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1125 /* 1126 * Convert the channel number to a channel reference. We 1127 * try first to preserve turbo attribute of the current 1128 * channel then fallback. Note this will not work if the 1129 * CSA specifies a channel that requires a band switch (e.g. 1130 * 11a => 11g). This is intentional as 11h is defined only 1131 * for 5GHz/11a and because the switch does not involve a 1132 * reassociation, protocol state (capabilities, negotated 1133 * rates, etc) may/will be wrong. 1134 */ 1135 struct ieee80211_channel *c = 1136 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1137 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1138 if (c == NULL) { 1139 c = ieee80211_find_channel_byieee(ic, 1140 csa->csa_newchan, 1141 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1142 if (c == NULL) { 1143 IEEE80211_DISCARD_IE(vap, 1144 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1145 wh, "CSA", "invalid channel %u", 1146 csa->csa_newchan); 1147 goto done; 1148 } 1149 } 1150#if IEEE80211_CSA_COUNT_MIN > 0 1151 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1152 /* 1153 * Require at least IEEE80211_CSA_COUNT_MIN count to 1154 * reduce the risk of being redirected by a fabricated 1155 * CSA. If a valid CSA is dropped we'll still get a 1156 * beacon miss when the AP leaves the channel so we'll 1157 * eventually follow to the new channel. 1158 * 1159 * NOTE: this violates the 11h spec that states that 1160 * count may be any value and if 0 then a switch 1161 * should happen asap. 1162 */ 1163 IEEE80211_DISCARD_IE(vap, 1164 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1165 wh, "CSA", "count %u too small, must be >= %u", 1166 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1167 goto done; 1168 } 1169#endif 1170 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1171 } else { 1172 /* 1173 * Validate this ie against the initial CSA. We require 1174 * mode and channel not change and the count must be 1175 * monotonically decreasing. This may be pointless and 1176 * canceling the switch as a result may be too paranoid but 1177 * in the worst case if we drop out of CSA because of this 1178 * and the AP does move then we'll just end up taking a 1179 * beacon miss and scan to find the AP. 1180 * 1181 * XXX may want <= on count as we also process ProbeResp 1182 * frames and those may come in w/ the same count as the 1183 * previous beacon; but doing so leaves us open to a stuck 1184 * count until we add a dead-man timer 1185 */ 1186 if (!(csa->csa_count < ic->ic_csa_count && 1187 csa->csa_mode == ic->ic_csa_mode && 1188 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1189 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1190 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1191 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1192 ic->ic_csa_newchan, ic->ic_csa_count, 1193 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1194 ieee80211_csa_cancelswitch(ic); 1195 } else { 1196 if (csa->csa_count <= 1) 1197 ieee80211_csa_completeswitch(ic); 1198 else 1199 ic->ic_csa_count = csa->csa_count; 1200 } 1201 } 1202done: 1203 IEEE80211_UNLOCK(ic); 1204} 1205 1206/* 1207 * Return non-zero if a background scan may be continued: 1208 * o bg scan is active 1209 * o no channel switch is pending 1210 * o there has not been any traffic recently 1211 * 1212 * Note we do not check if there is an administrative enable; 1213 * this is only done to start the scan. We assume that any 1214 * change in state will be accompanied by a request to cancel 1215 * active scans which will otherwise cause this test to fail. 1216 */ 1217static __inline int 1218contbgscan(struct ieee80211vap *vap) 1219{ 1220 struct ieee80211com *ic = vap->iv_ic; 1221 1222 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1223 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1224 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1225 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1226} 1227 1228/* 1229 * Return non-zero if a backgrond scan may be started: 1230 * o bg scanning is administratively enabled 1231 * o no channel switch is pending 1232 * o we are not boosted on a dynamic turbo channel 1233 * o there has not been a scan recently 1234 * o there has not been any traffic recently 1235 */ 1236static __inline int 1237startbgscan(struct ieee80211vap *vap) 1238{ 1239 struct ieee80211com *ic = vap->iv_ic; 1240 1241 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1242 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1243#ifdef IEEE80211_SUPPORT_SUPERG 1244 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1245#endif 1246 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1247 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1248} 1249 1250static void 1251sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1252 int subtype, int rssi, int nf) 1253{ 1254#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1255#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1256 struct ieee80211vap *vap = ni->ni_vap; 1257 struct ieee80211com *ic = ni->ni_ic; 1258 struct ieee80211_frame *wh; 1259 uint8_t *frm, *efrm; 1260 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1261 uint8_t rate; 1262 1263 wh = mtod(m0, struct ieee80211_frame *); 1264 frm = (uint8_t *)&wh[1]; 1265 efrm = mtod(m0, uint8_t *) + m0->m_len; 1266 switch (subtype) { 1267 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1268 case IEEE80211_FC0_SUBTYPE_BEACON: { 1269 struct ieee80211_scanparams scan; 1270 /* 1271 * We process beacon/probe response frames: 1272 * o when scanning, or 1273 * o station mode when associated (to collect state 1274 * updates such as 802.11g slot time) 1275 * Frames otherwise received are discarded. 1276 */ 1277 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1278 vap->iv_stats.is_rx_mgtdiscard++; 1279 return; 1280 } 1281 /* XXX probe response in sta mode when !scanning? */ 1282 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1283 return; 1284 /* 1285 * Count frame now that we know it's to be processed. 1286 */ 1287 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1288 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1289 IEEE80211_NODE_STAT(ni, rx_beacons); 1290 } else 1291 IEEE80211_NODE_STAT(ni, rx_proberesp); 1292 /* 1293 * When operating in station mode, check for state updates. 1294 * Be careful to ignore beacons received while doing a 1295 * background scan. We consider only 11g/WMM stuff right now. 1296 */ 1297 if (ni->ni_associd != 0 && 1298 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1299 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1300 /* record tsf of last beacon */ 1301 memcpy(ni->ni_tstamp.data, scan.tstamp, 1302 sizeof(ni->ni_tstamp)); 1303 /* count beacon frame for s/w bmiss handling */ 1304 vap->iv_swbmiss_count++; 1305 vap->iv_bmiss_count = 0; 1306 if (ni->ni_erp != scan.erp) { 1307 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1308 wh->i_addr2, 1309 "erp change: was 0x%x, now 0x%x", 1310 ni->ni_erp, scan.erp); 1311 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1312 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1313 ic->ic_flags |= IEEE80211_F_USEPROT; 1314 else 1315 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1316 ni->ni_erp = scan.erp; 1317 /* XXX statistic */ 1318 /* XXX driver notification */ 1319 } 1320 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1321 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1322 wh->i_addr2, 1323 "capabilities change: was 0x%x, now 0x%x", 1324 ni->ni_capinfo, scan.capinfo); 1325 /* 1326 * NB: we assume short preamble doesn't 1327 * change dynamically 1328 */ 1329 ieee80211_set_shortslottime(ic, 1330 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1331 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1332 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1333 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1334 /* XXX statistic */ 1335 } 1336 if (scan.wme != NULL && 1337 (ni->ni_flags & IEEE80211_NODE_QOS) && 1338 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1339 ieee80211_wme_updateparams(vap); 1340#ifdef IEEE80211_SUPPORT_SUPERG 1341 if (scan.ath != NULL) 1342 ieee80211_parse_athparams(ni, scan.ath, wh); 1343#endif 1344 if (scan.htcap != NULL && scan.htinfo != NULL && 1345 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1346 ieee80211_ht_updateparams(ni, 1347 scan.htcap, scan.htinfo); 1348 /* XXX state changes? */ 1349 } 1350 if (scan.tim != NULL) { 1351 struct ieee80211_tim_ie *tim = 1352 (struct ieee80211_tim_ie *) scan.tim; 1353#if 0 1354 int aid = IEEE80211_AID(ni->ni_associd); 1355 int ix = aid / NBBY; 1356 int min = tim->tim_bitctl &~ 1; 1357 int max = tim->tim_len + min - 4; 1358 if ((tim->tim_bitctl&1) || 1359 (min <= ix && ix <= max && 1360 isset(tim->tim_bitmap - min, aid))) { 1361 /* 1362 * XXX Do not let bg scan kick off 1363 * we are expecting data. 1364 */ 1365 ic->ic_lastdata = ticks; 1366 ieee80211_sta_pwrsave(vap, 0); 1367 } 1368#endif 1369 ni->ni_dtim_count = tim->tim_count; 1370 ni->ni_dtim_period = tim->tim_period; 1371 } 1372 if (scan.csa != NULL && 1373 (vap->iv_flags & IEEE80211_F_DOTH)) 1374 ieee80211_parse_csaparams(vap, scan.csa, wh); 1375 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1376 /* 1377 * No CSA ie or 11h disabled, but a channel 1378 * switch is pending; drop out so we aren't 1379 * stuck in CSA state. If the AP really is 1380 * moving we'll get a beacon miss and scan. 1381 */ 1382 IEEE80211_LOCK(ic); 1383 ieee80211_csa_cancelswitch(ic); 1384 IEEE80211_UNLOCK(ic); 1385 } 1386 /* 1387 * If scanning, pass the info to the scan module. 1388 * Otherwise, check if it's the right time to do 1389 * a background scan. Background scanning must 1390 * be enabled and we must not be operating in the 1391 * turbo phase of dynamic turbo mode. Then, 1392 * it's been a while since the last background 1393 * scan and if no data frames have come through 1394 * recently, kick off a scan. Note that this 1395 * is the mechanism by which a background scan 1396 * is started _and_ continued each time we 1397 * return on-channel to receive a beacon from 1398 * our ap. 1399 */ 1400 if (ic->ic_flags & IEEE80211_F_SCAN) { 1401 ieee80211_add_scan(vap, &scan, wh, 1402 subtype, rssi, nf); 1403 } else if (contbgscan(vap)) { 1404 ieee80211_bg_scan(vap, 0); 1405 } else if (startbgscan(vap)) { 1406 vap->iv_stats.is_scan_bg++; 1407#if 0 1408 /* wakeup if we are sleeing */ 1409 ieee80211_set_pwrsave(vap, 0); 1410#endif 1411 ieee80211_bg_scan(vap, 0); 1412 } 1413 return; 1414 } 1415 /* 1416 * If scanning, just pass information to the scan module. 1417 */ 1418 if (ic->ic_flags & IEEE80211_F_SCAN) { 1419 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1420 /* 1421 * Actively scanning a channel marked passive; 1422 * send a probe request now that we know there 1423 * is 802.11 traffic present. 1424 * 1425 * XXX check if the beacon we recv'd gives 1426 * us what we need and suppress the probe req 1427 */ 1428 ieee80211_probe_curchan(vap, 1); 1429 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1430 } 1431 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1432 return; 1433 } 1434 break; 1435 } 1436 1437 case IEEE80211_FC0_SUBTYPE_AUTH: { 1438 uint16_t algo, seq, status; 1439 /* 1440 * auth frame format 1441 * [2] algorithm 1442 * [2] sequence 1443 * [2] status 1444 * [tlv*] challenge 1445 */ 1446 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1447 algo = le16toh(*(uint16_t *)frm); 1448 seq = le16toh(*(uint16_t *)(frm + 2)); 1449 status = le16toh(*(uint16_t *)(frm + 4)); 1450 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1451 "recv auth frame with algorithm %d seq %d", algo, seq); 1452 1453 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1454 IEEE80211_DISCARD(vap, 1455 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1456 wh, "auth", "%s", "TKIP countermeasures enabled"); 1457 vap->iv_stats.is_rx_auth_countermeasures++; 1458 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1459 ieee80211_send_error(ni, wh->i_addr2, 1460 IEEE80211_FC0_SUBTYPE_AUTH, 1461 IEEE80211_REASON_MIC_FAILURE); 1462 } 1463 return; 1464 } 1465 if (algo == IEEE80211_AUTH_ALG_SHARED) 1466 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1467 seq, status); 1468 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1469 sta_auth_open(ni, wh, rssi, nf, seq, status); 1470 else { 1471 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1472 wh, "auth", "unsupported alg %d", algo); 1473 vap->iv_stats.is_rx_auth_unsupported++; 1474 return; 1475 } 1476 break; 1477 } 1478 1479 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1480 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1481 uint16_t capinfo, associd; 1482 uint16_t status; 1483 1484 if (vap->iv_state != IEEE80211_S_ASSOC) { 1485 vap->iv_stats.is_rx_mgtdiscard++; 1486 return; 1487 } 1488 1489 /* 1490 * asresp frame format 1491 * [2] capability information 1492 * [2] status 1493 * [2] association ID 1494 * [tlv] supported rates 1495 * [tlv] extended supported rates 1496 * [tlv] WME 1497 * [tlv] HT capabilities 1498 * [tlv] HT info 1499 */ 1500 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1501 ni = vap->iv_bss; 1502 capinfo = le16toh(*(uint16_t *)frm); 1503 frm += 2; 1504 status = le16toh(*(uint16_t *)frm); 1505 frm += 2; 1506 if (status != 0) { 1507 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1508 wh->i_addr2, "%sassoc failed (reason %d)", 1509 ISREASSOC(subtype) ? "re" : "", status); 1510 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1511 return; 1512 } 1513 associd = le16toh(*(uint16_t *)frm); 1514 frm += 2; 1515 1516 rates = xrates = wme = htcap = htinfo = NULL; 1517 while (efrm - frm > 1) { 1518 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1519 switch (*frm) { 1520 case IEEE80211_ELEMID_RATES: 1521 rates = frm; 1522 break; 1523 case IEEE80211_ELEMID_XRATES: 1524 xrates = frm; 1525 break; 1526 case IEEE80211_ELEMID_HTCAP: 1527 htcap = frm; 1528 break; 1529 case IEEE80211_ELEMID_HTINFO: 1530 htinfo = frm; 1531 break; 1532 case IEEE80211_ELEMID_VENDOR: 1533 if (iswmeoui(frm)) 1534 wme = frm; 1535 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1536 /* 1537 * Accept pre-draft HT ie's if the 1538 * standard ones have not been seen. 1539 */ 1540 if (ishtcapoui(frm)) { 1541 if (htcap == NULL) 1542 htcap = frm; 1543 } else if (ishtinfooui(frm)) { 1544 if (htinfo == NULL) 1545 htcap = frm; 1546 } 1547 } 1548 /* XXX Atheros OUI support */ 1549 break; 1550 } 1551 frm += frm[1] + 2; 1552 } 1553 1554 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1555 if (xrates != NULL) 1556 IEEE80211_VERIFY_ELEMENT(xrates, 1557 IEEE80211_RATE_MAXSIZE - rates[1], return); 1558 rate = ieee80211_setup_rates(ni, rates, xrates, 1559 IEEE80211_F_JOIN | 1560 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1561 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1562 if (rate & IEEE80211_RATE_BASIC) { 1563 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1564 wh->i_addr2, 1565 "%sassoc failed (rate set mismatch)", 1566 ISREASSOC(subtype) ? "re" : ""); 1567 vap->iv_stats.is_rx_assoc_norate++; 1568 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1569 IEEE80211_SCAN_FAIL_STATUS); 1570 return; 1571 } 1572 1573 ni->ni_capinfo = capinfo; 1574 ni->ni_associd = associd; 1575 if (ni->ni_jointime == 0) 1576 ni->ni_jointime = time_uptime; 1577 if (wme != NULL && 1578 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1579 ni->ni_flags |= IEEE80211_NODE_QOS; 1580 ieee80211_wme_updateparams(vap); 1581 } else 1582 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1583 /* 1584 * Setup HT state according to the negotiation. 1585 * 1586 * NB: shouldn't need to check if HT use is enabled but some 1587 * ap's send back HT ie's even when we don't indicate we 1588 * are HT capable in our AssocReq. 1589 */ 1590 if (htcap != NULL && htinfo != NULL && 1591 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1592 ieee80211_ht_node_init(ni); 1593 ieee80211_ht_updateparams(ni, htcap, htinfo); 1594 ieee80211_setup_htrates(ni, htcap, 1595 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1596 ieee80211_setup_basic_htrates(ni, htinfo); 1597 } else { 1598#ifdef IEEE80211_SUPPORT_SUPERG 1599 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1600 ieee80211_ff_node_init(ni); 1601#endif 1602 } 1603 /* 1604 * Configure state now that we are associated. 1605 * 1606 * XXX may need different/additional driver callbacks? 1607 */ 1608 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1609 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1610 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1611 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1612 } else { 1613 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1614 ic->ic_flags |= IEEE80211_F_USEBARKER; 1615 } 1616 ieee80211_set_shortslottime(ic, 1617 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1618 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1619 /* 1620 * Honor ERP protection. 1621 * 1622 * NB: ni_erp should zero for non-11g operation. 1623 */ 1624 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1625 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1626 ic->ic_flags |= IEEE80211_F_USEPROT; 1627 else 1628 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1629 IEEE80211_NOTE_MAC(vap, 1630 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1631 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1632 ISREASSOC(subtype) ? "re" : "", 1633 IEEE80211_NODE_AID(ni), 1634 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1635 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1636 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1637 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1638 ni->ni_flags & IEEE80211_NODE_HT ? 1639 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1640 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1641 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1642 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1643 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1644 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1645 ", fast-frames" : "", 1646 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1647 ", turbo" : "" 1648 ); 1649 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1650 break; 1651 } 1652 1653 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1654 uint16_t reason; 1655 1656 if (vap->iv_state == IEEE80211_S_SCAN) { 1657 vap->iv_stats.is_rx_mgtdiscard++; 1658 return; 1659 } 1660 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1661 /* NB: can happen when in promiscuous mode */ 1662 vap->iv_stats.is_rx_mgtdiscard++; 1663 break; 1664 } 1665 1666 /* 1667 * deauth frame format 1668 * [2] reason 1669 */ 1670 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1671 reason = le16toh(*(uint16_t *)frm); 1672 1673 vap->iv_stats.is_rx_deauth++; 1674 vap->iv_stats.is_rx_deauth_code = reason; 1675 IEEE80211_NODE_STAT(ni, rx_deauth); 1676 1677 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1678 "recv deauthenticate (reason %d)", reason); 1679 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1680 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1681 break; 1682 } 1683 1684 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1685 uint16_t reason; 1686 1687 if (vap->iv_state != IEEE80211_S_RUN && 1688 vap->iv_state != IEEE80211_S_ASSOC && 1689 vap->iv_state != IEEE80211_S_AUTH) { 1690 vap->iv_stats.is_rx_mgtdiscard++; 1691 return; 1692 } 1693 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1694 /* NB: can happen when in promiscuous mode */ 1695 vap->iv_stats.is_rx_mgtdiscard++; 1696 break; 1697 } 1698 1699 /* 1700 * disassoc frame format 1701 * [2] reason 1702 */ 1703 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1704 reason = le16toh(*(uint16_t *)frm); 1705 1706 vap->iv_stats.is_rx_disassoc++; 1707 vap->iv_stats.is_rx_disassoc_code = reason; 1708 IEEE80211_NODE_STAT(ni, rx_disassoc); 1709 1710 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1711 "recv disassociate (reason %d)", reason); 1712 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1713 break; 1714 } 1715 1716 case IEEE80211_FC0_SUBTYPE_ACTION: 1717 if (vap->iv_state == IEEE80211_S_RUN) { 1718 if (ieee80211_parse_action(ni, m0) == 0) 1719 ic->ic_recv_action(ni, frm, efrm); 1720 } else 1721 vap->iv_stats.is_rx_mgtdiscard++; 1722 break; 1723 1724 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1725 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1726 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1727 vap->iv_stats.is_rx_mgtdiscard++; 1728 return; 1729 default: 1730 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1731 wh, "mgt", "subtype 0x%x not handled", subtype); 1732 vap->iv_stats.is_rx_badsubtype++; 1733 break; 1734 } 1735#undef ISREASSOC 1736#undef ISPROBE 1737} 1738 1739static void 1740sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1741{ 1742} 1743