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 * $FreeBSD: head/sys/net80211/ieee80211_sta.c 203422 2010-02-03 10:07:43Z rpaulo $ 26 * $DragonFly$ 27 */ 28 29 /* 30 * IEEE 802.11 Station mode support. 31 */ 32 #include "opt_inet.h" 33 #include "opt_wlan.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/kernel.h> 40 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/endian.h> 44 #include <sys/errno.h> 45 #include <sys/proc.h> 46 #include <sys/sysctl.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 #include <net/route.h> 53 54 #include <net/bpf.h> 55 56 #include <netproto/802_11/ieee80211_var.h> 57 #include <netproto/802_11/ieee80211_sta.h> 58 #include <netproto/802_11/ieee80211_input.h> 59 #ifdef IEEE80211_SUPPORT_SUPERG 60 #include <netproto/802_11/ieee80211_superg.h> 61 #endif 62 63 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 64 65 static void sta_vattach(struct ieee80211vap *); 66 static void sta_beacon_miss(struct ieee80211vap *); 67 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 68 static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 69 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 70 int subtype, int rssi, int nf); 71 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 72 73 void 74 ieee80211_sta_attach(struct ieee80211com *ic) 75 { 76 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 77 } 78 79 void 80 ieee80211_sta_detach(struct ieee80211com *ic) 81 { 82 } 83 84 static void 85 sta_vdetach(struct ieee80211vap *vap) 86 { 87 } 88 89 static void 90 sta_vattach(struct ieee80211vap *vap) 91 { 92 vap->iv_newstate = sta_newstate; 93 vap->iv_input = sta_input; 94 vap->iv_recv_mgmt = sta_recv_mgmt; 95 vap->iv_recv_ctl = sta_recv_ctl; 96 vap->iv_opdetach = sta_vdetach; 97 vap->iv_bmiss = sta_beacon_miss; 98 } 99 100 /* 101 * Handle a beacon miss event. The common code filters out 102 * spurious events that can happen when scanning and/or before 103 * reaching RUN state. 104 */ 105 static void 106 sta_beacon_miss(struct ieee80211vap *vap) 107 { 108 struct ieee80211com *ic = vap->iv_ic; 109 110 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 111 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 112 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 113 114 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 115 "beacon miss, mode %s state %s\n", 116 ieee80211_opmode_name[vap->iv_opmode], 117 ieee80211_state_name[vap->iv_state]); 118 119 if (vap->iv_state == IEEE80211_S_CSA) { 120 /* 121 * A Channel Switch is pending; assume we missed the 122 * beacon that would've completed the process and just 123 * force the switch. If we made a mistake we'll not 124 * find the AP on the new channel and fall back to a 125 * normal scan. 126 */ 127 ieee80211_csa_completeswitch(ic); 128 return; 129 } 130 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 131 /* 132 * Send a directed probe req before falling back to a 133 * scan; if we receive a response ic_bmiss_count will 134 * be reset. Some cards mistakenly report beacon miss 135 * so this avoids the expensive scan if the ap is 136 * still there. 137 */ 138 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 139 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 140 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 141 return; 142 } 143 vap->iv_bmiss_count = 0; 144 vap->iv_stats.is_beacon_miss++; 145 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 146 #ifdef IEEE80211_SUPPORT_SUPERG 147 struct ieee80211com *ic = vap->iv_ic; 148 149 /* 150 * If we receive a beacon miss interrupt when using 151 * dynamic turbo, attempt to switch modes before 152 * reassociating. 153 */ 154 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 155 ieee80211_dturbo_switch(vap, 156 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 157 #endif 158 /* 159 * Try to reassociate before scanning for a new ap. 160 */ 161 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 162 } else { 163 /* 164 * Somebody else is controlling state changes (e.g. 165 * a user-mode app) don't do anything that would 166 * confuse them; just drop into scan mode so they'll 167 * notified of the state change and given control. 168 */ 169 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 170 } 171 } 172 173 /* 174 * Handle deauth with reason. We retry only for 175 * the cases where we might succeed. Otherwise 176 * we downgrade the ap and scan. 177 */ 178 static void 179 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 180 { 181 switch (reason) { 182 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 183 case IEEE80211_STATUS_TIMEOUT: 184 case IEEE80211_REASON_ASSOC_EXPIRE: 185 case IEEE80211_REASON_NOT_AUTHED: 186 case IEEE80211_REASON_NOT_ASSOCED: 187 case IEEE80211_REASON_ASSOC_LEAVE: 188 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 189 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 190 break; 191 default: 192 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 193 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 194 ieee80211_check_scan_current(vap); 195 break; 196 } 197 } 198 199 /* 200 * IEEE80211_M_STA vap state machine handler. 201 * This routine handles the main states in the 802.11 protocol. 202 */ 203 static int 204 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 205 { 206 struct ieee80211com *ic = vap->iv_ic; 207 struct ieee80211_node *ni; 208 enum ieee80211_state ostate; 209 210 IEEE80211_LOCK_ASSERT(ic); 211 212 ostate = vap->iv_state; 213 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 214 __func__, ieee80211_state_name[ostate], 215 ieee80211_state_name[nstate], arg); 216 vap->iv_state = nstate; /* state transition */ 217 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 218 if (ostate != IEEE80211_S_SCAN) 219 ieee80211_cancel_scan(vap); /* background scan */ 220 ni = vap->iv_bss; /* NB: no reference held */ 221 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 222 callout_stop(&vap->iv_swbmiss); 223 switch (nstate) { 224 case IEEE80211_S_INIT: 225 switch (ostate) { 226 case IEEE80211_S_SLEEP: 227 /* XXX wakeup */ 228 case IEEE80211_S_RUN: 229 IEEE80211_SEND_MGMT(ni, 230 IEEE80211_FC0_SUBTYPE_DISASSOC, 231 IEEE80211_REASON_ASSOC_LEAVE); 232 ieee80211_sta_leave(ni); 233 break; 234 case IEEE80211_S_ASSOC: 235 IEEE80211_SEND_MGMT(ni, 236 IEEE80211_FC0_SUBTYPE_DEAUTH, 237 IEEE80211_REASON_AUTH_LEAVE); 238 break; 239 case IEEE80211_S_SCAN: 240 ieee80211_cancel_scan(vap); 241 break; 242 default: 243 goto invalid; 244 } 245 if (ostate != IEEE80211_S_INIT) { 246 /* NB: optimize INIT -> INIT case */ 247 ieee80211_reset_bss(vap); 248 } 249 if (vap->iv_auth->ia_detach != NULL) 250 vap->iv_auth->ia_detach(vap); 251 break; 252 case IEEE80211_S_SCAN: 253 switch (ostate) { 254 case IEEE80211_S_INIT: 255 /* 256 * Initiate a scan. We can come here as a result 257 * of an IEEE80211_IOC_SCAN_REQ too in which case 258 * the vap will be marked with IEEE80211_FEXT_SCANREQ 259 * and the scan request parameters will be present 260 * in iv_scanreq. Otherwise we do the default. 261 */ 262 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 263 ieee80211_check_scan(vap, 264 vap->iv_scanreq_flags, 265 vap->iv_scanreq_duration, 266 vap->iv_scanreq_mindwell, 267 vap->iv_scanreq_maxdwell, 268 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 269 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 270 } else 271 ieee80211_check_scan_current(vap); 272 break; 273 case IEEE80211_S_SCAN: 274 case IEEE80211_S_AUTH: 275 case IEEE80211_S_ASSOC: 276 /* 277 * These can happen either because of a timeout 278 * on an assoc/auth response or because of a 279 * change in state that requires a reset. For 280 * the former we're called with a non-zero arg 281 * that is the cause for the failure; pass this 282 * to the scan code so it can update state. 283 * Otherwise trigger a new scan unless we're in 284 * manual roaming mode in which case an application 285 * must issue an explicit scan request. 286 */ 287 if (arg != 0) 288 ieee80211_scan_assoc_fail(vap, 289 vap->iv_bss->ni_macaddr, arg); 290 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 291 ieee80211_check_scan_current(vap); 292 break; 293 case IEEE80211_S_RUN: /* beacon miss */ 294 /* 295 * Beacon miss. Notify user space and if not 296 * under control of a user application (roaming 297 * manual) kick off a scan to re-connect. 298 */ 299 ieee80211_sta_leave(ni); 300 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 301 ieee80211_check_scan_current(vap); 302 break; 303 default: 304 goto invalid; 305 } 306 break; 307 case IEEE80211_S_AUTH: 308 switch (ostate) { 309 case IEEE80211_S_INIT: 310 case IEEE80211_S_SCAN: 311 IEEE80211_SEND_MGMT(ni, 312 IEEE80211_FC0_SUBTYPE_AUTH, 1); 313 break; 314 case IEEE80211_S_AUTH: 315 case IEEE80211_S_ASSOC: 316 switch (arg & 0xff) { 317 case IEEE80211_FC0_SUBTYPE_AUTH: 318 /* ??? */ 319 IEEE80211_SEND_MGMT(ni, 320 IEEE80211_FC0_SUBTYPE_AUTH, 2); 321 break; 322 case IEEE80211_FC0_SUBTYPE_DEAUTH: 323 sta_authretry(vap, ni, arg>>8); 324 break; 325 } 326 break; 327 case IEEE80211_S_RUN: 328 switch (arg & 0xff) { 329 case IEEE80211_FC0_SUBTYPE_AUTH: 330 IEEE80211_SEND_MGMT(ni, 331 IEEE80211_FC0_SUBTYPE_AUTH, 2); 332 vap->iv_state = ostate; /* stay RUN */ 333 break; 334 case IEEE80211_FC0_SUBTYPE_DEAUTH: 335 ieee80211_sta_leave(ni); 336 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 337 /* try to reauth */ 338 IEEE80211_SEND_MGMT(ni, 339 IEEE80211_FC0_SUBTYPE_AUTH, 1); 340 } 341 break; 342 } 343 break; 344 default: 345 goto invalid; 346 } 347 break; 348 case IEEE80211_S_ASSOC: 349 switch (ostate) { 350 case IEEE80211_S_AUTH: 351 case IEEE80211_S_ASSOC: 352 IEEE80211_SEND_MGMT(ni, 353 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 354 break; 355 case IEEE80211_S_SLEEP: /* cannot happen */ 356 case IEEE80211_S_RUN: 357 ieee80211_sta_leave(ni); 358 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 359 IEEE80211_SEND_MGMT(ni, arg ? 360 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 361 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 362 } 363 break; 364 default: 365 goto invalid; 366 } 367 break; 368 case IEEE80211_S_RUN: 369 if (vap->iv_flags & IEEE80211_F_WPA) { 370 /* XXX validate prerequisites */ 371 } 372 switch (ostate) { 373 case IEEE80211_S_RUN: 374 case IEEE80211_S_CSA: 375 break; 376 case IEEE80211_S_AUTH: /* when join is done in fw */ 377 case IEEE80211_S_ASSOC: 378 #ifdef IEEE80211_DEBUG 379 if (ieee80211_msg_debug(vap)) { 380 ieee80211_note(vap, "%s with %6D ssid ", 381 (vap->iv_opmode == IEEE80211_M_STA ? 382 "associated" : "synchronized"), 383 ni->ni_bssid, ":"); 384 ieee80211_print_essid(vap->iv_bss->ni_essid, 385 ni->ni_esslen); 386 /* XXX MCS/HT */ 387 kprintf(" channel %d start %uMb\n", 388 ieee80211_chan2ieee(ic, ic->ic_curchan), 389 IEEE80211_RATE2MBS(ni->ni_txrate)); 390 } 391 #endif 392 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 393 ieee80211_notify_node_join(ni, 394 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 395 break; 396 case IEEE80211_S_SLEEP: 397 ieee80211_sta_pwrsave(vap, 0); 398 break; 399 default: 400 goto invalid; 401 } 402 ieee80211_sync_curchan(ic); 403 if (ostate != IEEE80211_S_RUN && 404 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 405 /* 406 * Start s/w beacon miss timer for devices w/o 407 * hardware support. We fudge a bit here since 408 * we're doing this in software. 409 */ 410 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 411 2 * vap->iv_bmissthreshold * ni->ni_intval); 412 vap->iv_swbmiss_count = 0; 413 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 414 ieee80211_swbmiss, vap); 415 } 416 /* 417 * When 802.1x is not in use mark the port authorized 418 * at this point so traffic can flow. 419 */ 420 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 421 ieee80211_node_authorize(ni); 422 /* 423 * Fake association when joining an existing bss. 424 */ 425 if (ic->ic_newassoc != NULL) 426 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 427 break; 428 case IEEE80211_S_CSA: 429 if (ostate != IEEE80211_S_RUN) 430 goto invalid; 431 break; 432 case IEEE80211_S_SLEEP: 433 ieee80211_sta_pwrsave(vap, 1); 434 break; 435 default: 436 invalid: 437 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 438 "%s: unexpected state transition %s -> %s\n", __func__, 439 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 440 break; 441 } 442 return 0; 443 } 444 445 /* 446 * Return non-zero if the frame is an echo of a multicast 447 * frame sent by ourself. The dir is known to be DSTODS. 448 */ 449 static __inline int 450 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 451 { 452 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 453 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 454 const uint8_t *sa; 455 456 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 457 458 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 459 return 0; 460 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 461 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 462 #undef WH4 463 #undef QWH4 464 } 465 466 /* 467 * Return non-zero if the frame is an echo of a multicast 468 * frame sent by ourself. The dir is known to be FROMDS. 469 */ 470 static __inline int 471 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 472 { 473 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 474 475 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 476 return 0; 477 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 478 } 479 480 /* 481 * Decide if a received management frame should be 482 * printed when debugging is enabled. This filters some 483 * of the less interesting frames that come frequently 484 * (e.g. beacons). 485 */ 486 static __inline int 487 doprint(struct ieee80211vap *vap, int subtype) 488 { 489 switch (subtype) { 490 case IEEE80211_FC0_SUBTYPE_BEACON: 491 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 492 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 493 return 0; 494 } 495 return 1; 496 } 497 498 /* 499 * Process a received frame. The node associated with the sender 500 * should be supplied. If nothing was found in the node table then 501 * the caller is assumed to supply a reference to iv_bss instead. 502 * The RSSI and a timestamp are also supplied. The RSSI data is used 503 * during AP scanning to select a AP to associate with; it can have 504 * any units so long as values have consistent units and higher values 505 * mean ``better signal''. The receive timestamp is currently not used 506 * by the 802.11 layer. 507 */ 508 static int 509 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 510 { 511 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 512 #define HAS_SEQ(type) ((type & 0x4) == 0) 513 struct ieee80211vap *vap = ni->ni_vap; 514 struct ieee80211com *ic = ni->ni_ic; 515 struct ifnet *ifp = vap->iv_ifp; 516 struct ieee80211_frame *wh; 517 struct ieee80211_key *key; 518 struct ether_header *eh; 519 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 520 uint8_t dir, type, subtype, qos; 521 uint8_t *bssid; 522 uint16_t rxseq; 523 524 if (m->m_flags & M_AMPDU_MPDU) { 525 /* 526 * Fastpath for A-MPDU reorder q resubmission. Frames 527 * w/ M_AMPDU_MPDU marked have already passed through 528 * here but were received out of order and been held on 529 * the reorder queue. When resubmitted they are marked 530 * with the M_AMPDU_MPDU flag and we can bypass most of 531 * the normal processing. 532 */ 533 wh = mtod(m, struct ieee80211_frame *); 534 type = IEEE80211_FC0_TYPE_DATA; 535 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 536 subtype = IEEE80211_FC0_SUBTYPE_QOS; 537 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 538 goto resubmit_ampdu; 539 } 540 541 KASSERT(ni != NULL, ("null node")); 542 ni->ni_inact = ni->ni_inact_reload; 543 544 type = -1; /* undefined */ 545 546 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 547 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 548 ni->ni_macaddr, NULL, 549 "too short (1): len %u", m->m_pkthdr.len); 550 vap->iv_stats.is_rx_tooshort++; 551 goto out; 552 } 553 /* 554 * Bit of a cheat here, we use a pointer for a 3-address 555 * frame format but don't reference fields past outside 556 * ieee80211_frame_min w/o first validating the data is 557 * present. 558 */ 559 wh = mtod(m, struct ieee80211_frame *); 560 561 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 562 IEEE80211_FC0_VERSION_0) { 563 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 564 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 565 wh->i_fc[0], wh->i_fc[1]); 566 vap->iv_stats.is_rx_badversion++; 567 goto err; 568 } 569 570 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 571 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 572 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 573 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 574 bssid = wh->i_addr2; 575 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 576 /* not interested in */ 577 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 578 bssid, NULL, "%s", "not to bss"); 579 vap->iv_stats.is_rx_wrongbss++; 580 goto out; 581 } 582 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 583 ni->ni_noise = nf; 584 if (HAS_SEQ(type)) { 585 uint8_t tid = ieee80211_gettid(wh); 586 if (IEEE80211_QOS_HAS_SEQ(wh) && 587 TID_TO_WME_AC(tid) >= WME_AC_VI) 588 ic->ic_wme.wme_hipri_traffic++; 589 rxseq = le16toh(*(uint16_t *)wh->i_seq); 590 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 591 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 592 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 593 /* duplicate, discard */ 594 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 595 bssid, "duplicate", 596 "seqno <%u,%u> fragno <%u,%u> tid %u", 597 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 598 ni->ni_rxseqs[tid] >> 599 IEEE80211_SEQ_SEQ_SHIFT, 600 rxseq & IEEE80211_SEQ_FRAG_MASK, 601 ni->ni_rxseqs[tid] & 602 IEEE80211_SEQ_FRAG_MASK, 603 tid); 604 vap->iv_stats.is_rx_dup++; 605 IEEE80211_NODE_STAT(ni, rx_dup); 606 goto out; 607 } 608 ni->ni_rxseqs[tid] = rxseq; 609 } 610 } 611 612 switch (type) { 613 case IEEE80211_FC0_TYPE_DATA: 614 hdrspace = ieee80211_hdrspace(ic, wh); 615 if (m->m_len < hdrspace && 616 (m = m_pullup(m, hdrspace)) == NULL) { 617 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 618 ni->ni_macaddr, NULL, 619 "data too short: expecting %u", hdrspace); 620 vap->iv_stats.is_rx_tooshort++; 621 goto out; /* XXX */ 622 } 623 /* 624 * Handle A-MPDU re-ordering. If the frame is to be 625 * processed directly then ieee80211_ampdu_reorder 626 * will return 0; otherwise it has consumed the mbuf 627 * and we should do nothing more with it. 628 */ 629 if ((m->m_flags & M_AMPDU) && 630 (dir == IEEE80211_FC1_DIR_FROMDS || 631 dir == IEEE80211_FC1_DIR_DSTODS) && 632 ieee80211_ampdu_reorder(ni, m) != 0) { 633 m = NULL; 634 goto out; 635 } 636 resubmit_ampdu: 637 if (dir == IEEE80211_FC1_DIR_FROMDS) { 638 if ((ifp->if_flags & IFF_SIMPLEX) && 639 isfromds_mcastecho(vap, wh)) { 640 /* 641 * In IEEE802.11 network, multicast 642 * packets sent from "me" are broadcast 643 * from the AP; silently discard for 644 * SIMPLEX interface. 645 */ 646 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 647 wh, "data", "%s", "multicast echo"); 648 vap->iv_stats.is_rx_mcastecho++; 649 goto out; 650 } 651 if ((vap->iv_flags & IEEE80211_F_DWDS) && 652 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 653 /* 654 * DWDS sta's must drop 3-address mcast frames 655 * as they will be sent separately as a 4-addr 656 * frame. Accepting the 3-addr frame will 657 * confuse the bridge into thinking the sending 658 * sta is located at the end of WDS link. 659 */ 660 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 661 "3-address data", "%s", "DWDS enabled"); 662 vap->iv_stats.is_rx_mcastecho++; 663 goto out; 664 } 665 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 666 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 667 IEEE80211_DISCARD(vap, 668 IEEE80211_MSG_INPUT, wh, "4-address data", 669 "%s", "DWDS not enabled"); 670 vap->iv_stats.is_rx_wrongdir++; 671 goto out; 672 } 673 if ((ifp->if_flags & IFF_SIMPLEX) && 674 isdstods_mcastecho(vap, wh)) { 675 /* 676 * In IEEE802.11 network, multicast 677 * packets sent from "me" are broadcast 678 * from the AP; silently discard for 679 * SIMPLEX interface. 680 */ 681 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 682 "4-address data", "%s", "multicast echo"); 683 vap->iv_stats.is_rx_mcastecho++; 684 goto out; 685 } 686 } else { 687 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 688 "data", "incorrect dir 0x%x", dir); 689 vap->iv_stats.is_rx_wrongdir++; 690 goto out; 691 } 692 693 /* 694 * Handle privacy requirements. Note that we 695 * must not be preempted from here until after 696 * we (potentially) call ieee80211_crypto_demic; 697 * otherwise we may violate assumptions in the 698 * crypto cipher modules used to do delayed update 699 * of replay sequence numbers. 700 */ 701 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 702 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 703 /* 704 * Discard encrypted frames when privacy is off. 705 */ 706 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 707 wh, "WEP", "%s", "PRIVACY off"); 708 vap->iv_stats.is_rx_noprivacy++; 709 IEEE80211_NODE_STAT(ni, rx_noprivacy); 710 goto out; 711 } 712 key = ieee80211_crypto_decap(ni, m, hdrspace); 713 if (key == NULL) { 714 /* NB: stats+msgs handled in crypto_decap */ 715 IEEE80211_NODE_STAT(ni, rx_wepfail); 716 goto out; 717 } 718 wh = mtod(m, struct ieee80211_frame *); 719 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 720 } else { 721 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 722 key = NULL; 723 } 724 725 /* 726 * Save QoS bits for use below--before we strip the header. 727 */ 728 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 729 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 730 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 731 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 732 } else 733 qos = 0; 734 735 /* 736 * Next up, any fragmentation. 737 */ 738 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 739 m = ieee80211_defrag(ni, m, hdrspace); 740 if (m == NULL) { 741 /* Fragment dropped or frame not complete yet */ 742 goto out; 743 } 744 } 745 wh = NULL; /* no longer valid, catch any uses */ 746 747 /* 748 * Next strip any MSDU crypto bits. 749 */ 750 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 751 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 752 ni->ni_macaddr, "data", "%s", "demic error"); 753 vap->iv_stats.is_rx_demicfail++; 754 IEEE80211_NODE_STAT(ni, rx_demicfail); 755 goto out; 756 } 757 758 /* copy to listener after decrypt */ 759 if (ieee80211_radiotap_active_vap(vap)) 760 ieee80211_radiotap_rx(vap, m); 761 need_tap = 0; 762 763 /* 764 * Finally, strip the 802.11 header. 765 */ 766 m = ieee80211_decap(vap, m, hdrspace); 767 if (m == NULL) { 768 /* XXX mask bit to check for both */ 769 /* don't count Null data frames as errors */ 770 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 771 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 772 goto out; 773 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 774 ni->ni_macaddr, "data", "%s", "decap error"); 775 vap->iv_stats.is_rx_decap++; 776 IEEE80211_NODE_STAT(ni, rx_decap); 777 goto err; 778 } 779 eh = mtod(m, struct ether_header *); 780 if (!ieee80211_node_is_authorized(ni)) { 781 /* 782 * Deny any non-PAE frames received prior to 783 * authorization. For open/shared-key 784 * authentication the port is mark authorized 785 * after authentication completes. For 802.1x 786 * the port is not marked authorized by the 787 * authenticator until the handshake has completed. 788 */ 789 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 790 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 791 eh->ether_shost, "data", 792 "unauthorized port: ether type 0x%x len %u", 793 eh->ether_type, m->m_pkthdr.len); 794 vap->iv_stats.is_rx_unauth++; 795 IEEE80211_NODE_STAT(ni, rx_unauth); 796 goto err; 797 } 798 } else { 799 /* 800 * When denying unencrypted frames, discard 801 * any non-PAE frames received without encryption. 802 */ 803 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 804 (key == NULL && (m->m_flags & M_WEP) == 0) && 805 eh->ether_type != htons(ETHERTYPE_PAE)) { 806 /* 807 * Drop unencrypted frames. 808 */ 809 vap->iv_stats.is_rx_unencrypted++; 810 IEEE80211_NODE_STAT(ni, rx_unencrypted); 811 goto out; 812 } 813 } 814 /* XXX require HT? */ 815 if (qos & IEEE80211_QOS_AMSDU) { 816 m = ieee80211_decap_amsdu(ni, m); 817 if (m == NULL) 818 return IEEE80211_FC0_TYPE_DATA; 819 } else { 820 #ifdef IEEE80211_SUPPORT_SUPERG 821 m = ieee80211_decap_fastframe(vap, ni, m); 822 if (m == NULL) 823 return IEEE80211_FC0_TYPE_DATA; 824 #endif 825 } 826 ieee80211_deliver_data(vap, ni, m); 827 return IEEE80211_FC0_TYPE_DATA; 828 829 case IEEE80211_FC0_TYPE_MGT: 830 vap->iv_stats.is_rx_mgmt++; 831 IEEE80211_NODE_STAT(ni, rx_mgmt); 832 if (dir != IEEE80211_FC1_DIR_NODS) { 833 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 834 wh, "data", "incorrect dir 0x%x", dir); 835 vap->iv_stats.is_rx_wrongdir++; 836 goto err; 837 } 838 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 839 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 840 ni->ni_macaddr, "mgt", "too short: len %u", 841 m->m_pkthdr.len); 842 vap->iv_stats.is_rx_tooshort++; 843 goto out; 844 } 845 #ifdef IEEE80211_DEBUG 846 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 847 ieee80211_msg_dumppkts(vap)) { 848 if_printf(ifp, "received %s from %6D rssi %d\n", 849 ieee80211_mgt_subtype_name[subtype >> 850 IEEE80211_FC0_SUBTYPE_SHIFT], 851 wh->i_addr2, ":", rssi); 852 } 853 #endif 854 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 855 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 856 /* 857 * Only shared key auth frames with a challenge 858 * should be encrypted, discard all others. 859 */ 860 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 861 wh, ieee80211_mgt_subtype_name[subtype >> 862 IEEE80211_FC0_SUBTYPE_SHIFT], 863 "%s", "WEP set but not permitted"); 864 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 865 goto out; 866 } 867 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 868 /* 869 * Discard encrypted frames when privacy is off. 870 */ 871 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 872 wh, "mgt", "%s", "WEP set but PRIVACY off"); 873 vap->iv_stats.is_rx_noprivacy++; 874 goto out; 875 } 876 hdrspace = ieee80211_hdrspace(ic, wh); 877 key = ieee80211_crypto_decap(ni, m, hdrspace); 878 if (key == NULL) { 879 /* NB: stats+msgs handled in crypto_decap */ 880 goto out; 881 } 882 wh = mtod(m, struct ieee80211_frame *); 883 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 884 } 885 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 886 goto out; 887 888 case IEEE80211_FC0_TYPE_CTL: 889 vap->iv_stats.is_rx_ctl++; 890 IEEE80211_NODE_STAT(ni, rx_ctrl); 891 vap->iv_recv_ctl(ni, m, subtype); 892 goto out; 893 894 default: 895 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 896 wh, NULL, "bad frame type 0x%x", type); 897 /* should not come here */ 898 break; 899 } 900 err: 901 ifp->if_ierrors++; 902 out: 903 if (m != NULL) { 904 if (need_tap && ieee80211_radiotap_active_vap(vap)) 905 ieee80211_radiotap_rx(vap, m); 906 m_freem(m); 907 } 908 return type; 909 #undef SEQ_LEQ 910 } 911 912 static void 913 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 914 int rssi, int nf, uint16_t seq, uint16_t status) 915 { 916 struct ieee80211vap *vap = ni->ni_vap; 917 918 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 919 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 920 ni->ni_macaddr, "open auth", 921 "bad sta auth mode %u", ni->ni_authmode); 922 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 923 return; 924 } 925 if (vap->iv_state != IEEE80211_S_AUTH || 926 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 927 vap->iv_stats.is_rx_bad_auth++; 928 return; 929 } 930 if (status != 0) { 931 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 932 ni, "open auth failed (reason %d)", status); 933 vap->iv_stats.is_rx_auth_fail++; 934 vap->iv_stats.is_rx_authfail_code = status; 935 ieee80211_new_state(vap, IEEE80211_S_SCAN, 936 IEEE80211_SCAN_FAIL_STATUS); 937 } else 938 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 939 } 940 941 static void 942 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 943 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 944 uint16_t seq, uint16_t status) 945 { 946 struct ieee80211vap *vap = ni->ni_vap; 947 uint8_t *challenge; 948 int estatus; 949 950 /* 951 * NB: this can happen as we allow pre-shared key 952 * authentication to be enabled w/o wep being turned 953 * on so that configuration of these can be done 954 * in any order. It may be better to enforce the 955 * ordering in which case this check would just be 956 * for sanity/consistency. 957 */ 958 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 960 ni->ni_macaddr, "shared key auth", 961 "%s", " PRIVACY is disabled"); 962 estatus = IEEE80211_STATUS_ALG; 963 goto bad; 964 } 965 /* 966 * Pre-shared key authentication is evil; accept 967 * it only if explicitly configured (it is supported 968 * mainly for compatibility with clients like OS X). 969 */ 970 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 971 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 972 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 973 ni->ni_macaddr, "shared key auth", 974 "bad sta auth mode %u", ni->ni_authmode); 975 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 976 estatus = IEEE80211_STATUS_ALG; 977 goto bad; 978 } 979 980 challenge = NULL; 981 if (frm + 1 < efrm) { 982 if ((frm[1] + 2) > (efrm - frm)) { 983 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 984 ni->ni_macaddr, "shared key auth", 985 "ie %d/%d too long", 986 frm[0], (frm[1] + 2) - (efrm - frm)); 987 vap->iv_stats.is_rx_bad_auth++; 988 estatus = IEEE80211_STATUS_CHALLENGE; 989 goto bad; 990 } 991 if (*frm == IEEE80211_ELEMID_CHALLENGE) 992 challenge = frm; 993 frm += frm[1] + 2; 994 } 995 switch (seq) { 996 case IEEE80211_AUTH_SHARED_CHALLENGE: 997 case IEEE80211_AUTH_SHARED_RESPONSE: 998 if (challenge == NULL) { 999 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1000 ni->ni_macaddr, "shared key auth", 1001 "%s", "no challenge"); 1002 vap->iv_stats.is_rx_bad_auth++; 1003 estatus = IEEE80211_STATUS_CHALLENGE; 1004 goto bad; 1005 } 1006 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1007 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1008 ni->ni_macaddr, "shared key auth", 1009 "bad challenge len %d", challenge[1]); 1010 vap->iv_stats.is_rx_bad_auth++; 1011 estatus = IEEE80211_STATUS_CHALLENGE; 1012 goto bad; 1013 } 1014 default: 1015 break; 1016 } 1017 if (vap->iv_state != IEEE80211_S_AUTH) 1018 return; 1019 switch (seq) { 1020 case IEEE80211_AUTH_SHARED_PASS: 1021 if (ni->ni_challenge != NULL) { 1022 kfree(ni->ni_challenge, M_80211_NODE); 1023 ni->ni_challenge = NULL; 1024 } 1025 if (status != 0) { 1026 IEEE80211_NOTE_FRAME(vap, 1027 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1028 "shared key auth failed (reason %d)", status); 1029 vap->iv_stats.is_rx_auth_fail++; 1030 vap->iv_stats.is_rx_authfail_code = status; 1031 return; 1032 } 1033 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1034 break; 1035 case IEEE80211_AUTH_SHARED_CHALLENGE: 1036 if (!ieee80211_alloc_challenge(ni)) 1037 return; 1038 /* XXX could optimize by passing recvd challenge */ 1039 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1040 IEEE80211_SEND_MGMT(ni, 1041 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1042 break; 1043 default: 1044 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1045 wh, "shared key auth", "bad seq %d", seq); 1046 vap->iv_stats.is_rx_bad_auth++; 1047 return; 1048 } 1049 return; 1050 bad: 1051 /* 1052 * Kick the state machine. This short-circuits 1053 * using the mgt frame timeout to trigger the 1054 * state transition. 1055 */ 1056 if (vap->iv_state == IEEE80211_S_AUTH) 1057 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1058 IEEE80211_SCAN_FAIL_STATUS); 1059 } 1060 1061 static int 1062 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1063 const struct ieee80211_frame *wh) 1064 { 1065 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1066 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1067 u_int len = frm[1], qosinfo; 1068 int i; 1069 1070 if (len < sizeof(struct ieee80211_wme_param)-2) { 1071 IEEE80211_DISCARD_IE(vap, 1072 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1073 wh, "WME", "too short, len %u", len); 1074 return -1; 1075 } 1076 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1077 qosinfo &= WME_QOSINFO_COUNT; 1078 /* XXX do proper check for wraparound */ 1079 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1080 return 0; 1081 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1082 for (i = 0; i < WME_NUM_AC; i++) { 1083 struct wmeParams *wmep = 1084 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1085 /* NB: ACI not used */ 1086 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1087 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1088 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1089 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1090 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1091 frm += 4; 1092 } 1093 wme->wme_wmeChanParams.cap_info = qosinfo; 1094 return 1; 1095 #undef MS 1096 } 1097 1098 /* 1099 * Process 11h Channel Switch Announcement (CSA) ie. If this 1100 * is the first CSA then initiate the switch. Otherwise we 1101 * track state and trigger completion and/or cancel of the switch. 1102 * XXX should be public for IBSS use 1103 */ 1104 static void 1105 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1106 const struct ieee80211_frame *wh) 1107 { 1108 struct ieee80211com *ic = vap->iv_ic; 1109 const struct ieee80211_csa_ie *csa = 1110 (const struct ieee80211_csa_ie *) frm; 1111 1112 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1113 ("state %s", ieee80211_state_name[vap->iv_state])); 1114 1115 if (csa->csa_mode > 1) { 1116 IEEE80211_DISCARD_IE(vap, 1117 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1118 wh, "CSA", "invalid mode %u", csa->csa_mode); 1119 return; 1120 } 1121 IEEE80211_LOCK(ic); 1122 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1123 /* 1124 * Convert the channel number to a channel reference. We 1125 * try first to preserve turbo attribute of the current 1126 * channel then fallback. Note this will not work if the 1127 * CSA specifies a channel that requires a band switch (e.g. 1128 * 11a => 11g). This is intentional as 11h is defined only 1129 * for 5GHz/11a and because the switch does not involve a 1130 * reassociation, protocol state (capabilities, negotated 1131 * rates, etc) may/will be wrong. 1132 */ 1133 struct ieee80211_channel *c = 1134 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1135 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1136 if (c == NULL) { 1137 c = ieee80211_find_channel_byieee(ic, 1138 csa->csa_newchan, 1139 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1140 if (c == NULL) { 1141 IEEE80211_DISCARD_IE(vap, 1142 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1143 wh, "CSA", "invalid channel %u", 1144 csa->csa_newchan); 1145 goto done; 1146 } 1147 } 1148 #if IEEE80211_CSA_COUNT_MIN > 0 1149 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1150 /* 1151 * Require at least IEEE80211_CSA_COUNT_MIN count to 1152 * reduce the risk of being redirected by a fabricated 1153 * CSA. If a valid CSA is dropped we'll still get a 1154 * beacon miss when the AP leaves the channel so we'll 1155 * eventually follow to the new channel. 1156 * 1157 * NOTE: this violates the 11h spec that states that 1158 * count may be any value and if 0 then a switch 1159 * should happen asap. 1160 */ 1161 IEEE80211_DISCARD_IE(vap, 1162 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1163 wh, "CSA", "count %u too small, must be >= %u", 1164 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1165 goto done; 1166 } 1167 #endif 1168 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1169 } else { 1170 /* 1171 * Validate this ie against the initial CSA. We require 1172 * mode and channel not change and the count must be 1173 * monotonically decreasing. This may be pointless and 1174 * canceling the switch as a result may be too paranoid but 1175 * in the worst case if we drop out of CSA because of this 1176 * and the AP does move then we'll just end up taking a 1177 * beacon miss and scan to find the AP. 1178 * 1179 * XXX may want <= on count as we also process ProbeResp 1180 * frames and those may come in w/ the same count as the 1181 * previous beacon; but doing so leaves us open to a stuck 1182 * count until we add a dead-man timer 1183 */ 1184 if (!(csa->csa_count < ic->ic_csa_count && 1185 csa->csa_mode == ic->ic_csa_mode && 1186 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1187 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1188 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1189 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1190 ic->ic_csa_newchan, ic->ic_csa_count, 1191 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1192 ieee80211_csa_cancelswitch(ic); 1193 } else { 1194 if (csa->csa_count <= 1) 1195 ieee80211_csa_completeswitch(ic); 1196 else 1197 ic->ic_csa_count = csa->csa_count; 1198 } 1199 } 1200 done: 1201 IEEE80211_UNLOCK(ic); 1202 } 1203 1204 /* 1205 * Return non-zero if a background scan may be continued: 1206 * o bg scan is active 1207 * o no channel switch is pending 1208 * o there has not been any traffic recently 1209 * 1210 * Note we do not check if there is an administrative enable; 1211 * this is only done to start the scan. We assume that any 1212 * change in state will be accompanied by a request to cancel 1213 * active scans which will otherwise cause this test to fail. 1214 */ 1215 static __inline int 1216 contbgscan(struct ieee80211vap *vap) 1217 { 1218 struct ieee80211com *ic = vap->iv_ic; 1219 1220 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1221 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1222 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1223 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1224 } 1225 1226 /* 1227 * Return non-zero if a backgrond scan may be started: 1228 * o bg scanning is administratively enabled 1229 * o no channel switch is pending 1230 * o we are not boosted on a dynamic turbo channel 1231 * o there has not been a scan recently 1232 * o there has not been any traffic recently 1233 */ 1234 static __inline int 1235 startbgscan(struct ieee80211vap *vap) 1236 { 1237 struct ieee80211com *ic = vap->iv_ic; 1238 1239 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1240 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1241 #ifdef IEEE80211_SUPPORT_SUPERG 1242 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1243 #endif 1244 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1245 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1246 } 1247 1248 static void 1249 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1250 int subtype, int rssi, int nf) 1251 { 1252 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1253 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1254 struct ieee80211vap *vap = ni->ni_vap; 1255 struct ieee80211com *ic = ni->ni_ic; 1256 struct ieee80211_frame *wh; 1257 uint8_t *frm, *efrm; 1258 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1259 uint8_t rate; 1260 1261 wh = mtod(m0, struct ieee80211_frame *); 1262 frm = (uint8_t *)&wh[1]; 1263 efrm = mtod(m0, uint8_t *) + m0->m_len; 1264 switch (subtype) { 1265 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1266 case IEEE80211_FC0_SUBTYPE_BEACON: { 1267 struct ieee80211_scanparams scan; 1268 /* 1269 * We process beacon/probe response frames: 1270 * o when scanning, or 1271 * o station mode when associated (to collect state 1272 * updates such as 802.11g slot time) 1273 * Frames otherwise received are discarded. 1274 */ 1275 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1276 vap->iv_stats.is_rx_mgtdiscard++; 1277 return; 1278 } 1279 /* XXX probe response in sta mode when !scanning? */ 1280 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1281 return; 1282 /* 1283 * Count frame now that we know it's to be processed. 1284 */ 1285 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1286 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1287 IEEE80211_NODE_STAT(ni, rx_beacons); 1288 } else 1289 IEEE80211_NODE_STAT(ni, rx_proberesp); 1290 /* 1291 * When operating in station mode, check for state updates. 1292 * Be careful to ignore beacons received while doing a 1293 * background scan. We consider only 11g/WMM stuff right now. 1294 */ 1295 if (ni->ni_associd != 0 && 1296 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1297 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1298 /* record tsf of last beacon */ 1299 memcpy(ni->ni_tstamp.data, scan.tstamp, 1300 sizeof(ni->ni_tstamp)); 1301 /* count beacon frame for s/w bmiss handling */ 1302 vap->iv_swbmiss_count++; 1303 vap->iv_bmiss_count = 0; 1304 if (ni->ni_erp != scan.erp) { 1305 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1306 wh->i_addr2, 1307 "erp change: was 0x%x, now 0x%x", 1308 ni->ni_erp, scan.erp); 1309 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1310 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1311 ic->ic_flags |= IEEE80211_F_USEPROT; 1312 else 1313 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1314 ni->ni_erp = scan.erp; 1315 /* XXX statistic */ 1316 /* XXX driver notification */ 1317 } 1318 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1319 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1320 wh->i_addr2, 1321 "capabilities change: was 0x%x, now 0x%x", 1322 ni->ni_capinfo, scan.capinfo); 1323 /* 1324 * NB: we assume short preamble doesn't 1325 * change dynamically 1326 */ 1327 ieee80211_set_shortslottime(ic, 1328 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1329 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1330 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1331 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1332 /* XXX statistic */ 1333 } 1334 if (scan.wme != NULL && 1335 (ni->ni_flags & IEEE80211_NODE_QOS) && 1336 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1337 ieee80211_wme_updateparams(vap); 1338 #ifdef IEEE80211_SUPPORT_SUPERG 1339 if (scan.ath != NULL) 1340 ieee80211_parse_athparams(ni, scan.ath, wh); 1341 #endif 1342 if (scan.htcap != NULL && scan.htinfo != NULL && 1343 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1344 ieee80211_ht_updateparams(ni, 1345 scan.htcap, scan.htinfo); 1346 /* XXX state changes? */ 1347 } 1348 if (scan.tim != NULL) { 1349 struct ieee80211_tim_ie *tim = 1350 (struct ieee80211_tim_ie *) scan.tim; 1351 #if 0 1352 int aid = IEEE80211_AID(ni->ni_associd); 1353 int ix = aid / NBBY; 1354 int min = tim->tim_bitctl &~ 1; 1355 int max = tim->tim_len + min - 4; 1356 if ((tim->tim_bitctl&1) || 1357 (min <= ix && ix <= max && 1358 isset(tim->tim_bitmap - min, aid))) { 1359 /* 1360 * XXX Do not let bg scan kick off 1361 * we are expecting data. 1362 */ 1363 ic->ic_lastdata = ticks; 1364 ieee80211_sta_pwrsave(vap, 0); 1365 } 1366 #endif 1367 ni->ni_dtim_count = tim->tim_count; 1368 ni->ni_dtim_period = tim->tim_period; 1369 } 1370 if (scan.csa != NULL && 1371 (vap->iv_flags & IEEE80211_F_DOTH)) 1372 ieee80211_parse_csaparams(vap, scan.csa, wh); 1373 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1374 /* 1375 * No CSA ie or 11h disabled, but a channel 1376 * switch is pending; drop out so we aren't 1377 * stuck in CSA state. If the AP really is 1378 * moving we'll get a beacon miss and scan. 1379 */ 1380 IEEE80211_LOCK(ic); 1381 ieee80211_csa_cancelswitch(ic); 1382 IEEE80211_UNLOCK(ic); 1383 } 1384 /* 1385 * If scanning, pass the info to the scan module. 1386 * Otherwise, check if it's the right time to do 1387 * a background scan. Background scanning must 1388 * be enabled and we must not be operating in the 1389 * turbo phase of dynamic turbo mode. Then, 1390 * it's been a while since the last background 1391 * scan and if no data frames have come through 1392 * recently, kick off a scan. Note that this 1393 * is the mechanism by which a background scan 1394 * is started _and_ continued each time we 1395 * return on-channel to receive a beacon from 1396 * our ap. 1397 */ 1398 if (ic->ic_flags & IEEE80211_F_SCAN) { 1399 ieee80211_add_scan(vap, &scan, wh, 1400 subtype, rssi, nf); 1401 } else if (contbgscan(vap)) { 1402 ieee80211_bg_scan(vap, 0); 1403 } else if (startbgscan(vap)) { 1404 vap->iv_stats.is_scan_bg++; 1405 #if 0 1406 /* wakeup if we are sleeing */ 1407 ieee80211_set_pwrsave(vap, 0); 1408 #endif 1409 ieee80211_bg_scan(vap, 0); 1410 } 1411 return; 1412 } 1413 /* 1414 * If scanning, just pass information to the scan module. 1415 */ 1416 if (ic->ic_flags & IEEE80211_F_SCAN) { 1417 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1418 /* 1419 * Actively scanning a channel marked passive; 1420 * send a probe request now that we know there 1421 * is 802.11 traffic present. 1422 * 1423 * XXX check if the beacon we recv'd gives 1424 * us what we need and suppress the probe req 1425 */ 1426 ieee80211_probe_curchan(vap, 1); 1427 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1428 } 1429 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1430 return; 1431 } 1432 break; 1433 } 1434 1435 case IEEE80211_FC0_SUBTYPE_AUTH: { 1436 uint16_t algo, seq, status; 1437 /* 1438 * auth frame format 1439 * [2] algorithm 1440 * [2] sequence 1441 * [2] status 1442 * [tlv*] challenge 1443 */ 1444 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1445 algo = le16toh(*(uint16_t *)frm); 1446 seq = le16toh(*(uint16_t *)(frm + 2)); 1447 status = le16toh(*(uint16_t *)(frm + 4)); 1448 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1449 "recv auth frame with algorithm %d seq %d", algo, seq); 1450 1451 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1452 IEEE80211_DISCARD(vap, 1453 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1454 wh, "auth", "%s", "TKIP countermeasures enabled"); 1455 vap->iv_stats.is_rx_auth_countermeasures++; 1456 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1457 ieee80211_send_error(ni, wh->i_addr2, 1458 IEEE80211_FC0_SUBTYPE_AUTH, 1459 IEEE80211_REASON_MIC_FAILURE); 1460 } 1461 return; 1462 } 1463 if (algo == IEEE80211_AUTH_ALG_SHARED) 1464 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1465 seq, status); 1466 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1467 sta_auth_open(ni, wh, rssi, nf, seq, status); 1468 else { 1469 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1470 wh, "auth", "unsupported alg %d", algo); 1471 vap->iv_stats.is_rx_auth_unsupported++; 1472 return; 1473 } 1474 break; 1475 } 1476 1477 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1478 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1479 uint16_t capinfo, associd; 1480 uint16_t status; 1481 1482 if (vap->iv_state != IEEE80211_S_ASSOC) { 1483 vap->iv_stats.is_rx_mgtdiscard++; 1484 return; 1485 } 1486 1487 /* 1488 * asresp frame format 1489 * [2] capability information 1490 * [2] status 1491 * [2] association ID 1492 * [tlv] supported rates 1493 * [tlv] extended supported rates 1494 * [tlv] WME 1495 * [tlv] HT capabilities 1496 * [tlv] HT info 1497 */ 1498 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1499 ni = vap->iv_bss; 1500 capinfo = le16toh(*(uint16_t *)frm); 1501 frm += 2; 1502 status = le16toh(*(uint16_t *)frm); 1503 frm += 2; 1504 if (status != 0) { 1505 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1506 wh->i_addr2, "%sassoc failed (reason %d)", 1507 ISREASSOC(subtype) ? "re" : "", status); 1508 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1509 return; 1510 } 1511 associd = le16toh(*(uint16_t *)frm); 1512 frm += 2; 1513 1514 rates = xrates = wme = htcap = htinfo = NULL; 1515 while (efrm - frm > 1) { 1516 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1517 switch (*frm) { 1518 case IEEE80211_ELEMID_RATES: 1519 rates = frm; 1520 break; 1521 case IEEE80211_ELEMID_XRATES: 1522 xrates = frm; 1523 break; 1524 case IEEE80211_ELEMID_HTCAP: 1525 htcap = frm; 1526 break; 1527 case IEEE80211_ELEMID_HTINFO: 1528 htinfo = frm; 1529 break; 1530 case IEEE80211_ELEMID_VENDOR: 1531 if (iswmeoui(frm)) 1532 wme = frm; 1533 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1534 /* 1535 * Accept pre-draft HT ie's if the 1536 * standard ones have not been seen. 1537 */ 1538 if (ishtcapoui(frm)) { 1539 if (htcap == NULL) 1540 htcap = frm; 1541 } else if (ishtinfooui(frm)) { 1542 if (htinfo == NULL) 1543 htcap = frm; 1544 } 1545 } 1546 /* XXX Atheros OUI support */ 1547 break; 1548 } 1549 frm += frm[1] + 2; 1550 } 1551 1552 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1553 if (xrates != NULL) 1554 IEEE80211_VERIFY_ELEMENT(xrates, 1555 IEEE80211_RATE_MAXSIZE - rates[1], return); 1556 rate = ieee80211_setup_rates(ni, rates, xrates, 1557 IEEE80211_F_JOIN | 1558 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1559 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1560 if (rate & IEEE80211_RATE_BASIC) { 1561 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1562 wh->i_addr2, 1563 "%sassoc failed (rate set mismatch)", 1564 ISREASSOC(subtype) ? "re" : ""); 1565 vap->iv_stats.is_rx_assoc_norate++; 1566 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1567 IEEE80211_SCAN_FAIL_STATUS); 1568 return; 1569 } 1570 1571 ni->ni_capinfo = capinfo; 1572 ni->ni_associd = associd; 1573 if (ni->ni_jointime == 0) 1574 ni->ni_jointime = time_second; 1575 if (wme != NULL && 1576 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1577 ni->ni_flags |= IEEE80211_NODE_QOS; 1578 ieee80211_wme_updateparams(vap); 1579 } else 1580 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1581 /* 1582 * Setup HT state according to the negotiation. 1583 * 1584 * NB: shouldn't need to check if HT use is enabled but some 1585 * ap's send back HT ie's even when we don't indicate we 1586 * are HT capable in our AssocReq. 1587 */ 1588 if (htcap != NULL && htinfo != NULL && 1589 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1590 ieee80211_ht_node_init(ni); 1591 ieee80211_ht_updateparams(ni, htcap, htinfo); 1592 ieee80211_setup_htrates(ni, htcap, 1593 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1594 ieee80211_setup_basic_htrates(ni, htinfo); 1595 ieee80211_node_setuptxparms(ni); 1596 } else { 1597 #ifdef IEEE80211_SUPPORT_SUPERG 1598 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1599 ieee80211_ff_node_init(ni); 1600 #endif 1601 } 1602 /* 1603 * Configure state now that we are associated. 1604 * 1605 * XXX may need different/additional driver callbacks? 1606 */ 1607 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1608 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1609 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1610 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1611 } else { 1612 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1613 ic->ic_flags |= IEEE80211_F_USEBARKER; 1614 } 1615 ieee80211_set_shortslottime(ic, 1616 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1617 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1618 /* 1619 * Honor ERP protection. 1620 * 1621 * NB: ni_erp should zero for non-11g operation. 1622 */ 1623 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1624 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1625 ic->ic_flags |= IEEE80211_F_USEPROT; 1626 else 1627 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1628 IEEE80211_NOTE_MAC(vap, 1629 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1630 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1631 ISREASSOC(subtype) ? "re" : "", 1632 IEEE80211_NODE_AID(ni), 1633 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1634 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1635 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1636 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1637 ni->ni_flags & IEEE80211_NODE_HT ? 1638 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1639 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1640 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1641 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1642 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1643 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1644 ", fast-frames" : "", 1645 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1646 ", turbo" : "" 1647 ); 1648 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1649 break; 1650 } 1651 1652 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1653 uint16_t reason; 1654 1655 if (vap->iv_state == IEEE80211_S_SCAN) { 1656 vap->iv_stats.is_rx_mgtdiscard++; 1657 return; 1658 } 1659 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1660 /* NB: can happen when in promiscuous mode */ 1661 vap->iv_stats.is_rx_mgtdiscard++; 1662 break; 1663 } 1664 1665 /* 1666 * deauth frame format 1667 * [2] reason 1668 */ 1669 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1670 reason = le16toh(*(uint16_t *)frm); 1671 1672 vap->iv_stats.is_rx_deauth++; 1673 vap->iv_stats.is_rx_deauth_code = reason; 1674 IEEE80211_NODE_STAT(ni, rx_deauth); 1675 1676 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1677 "recv deauthenticate (reason %d)", reason); 1678 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1679 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1680 break; 1681 } 1682 1683 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1684 uint16_t reason; 1685 1686 if (vap->iv_state != IEEE80211_S_RUN && 1687 vap->iv_state != IEEE80211_S_ASSOC && 1688 vap->iv_state != IEEE80211_S_AUTH) { 1689 vap->iv_stats.is_rx_mgtdiscard++; 1690 return; 1691 } 1692 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1693 /* NB: can happen when in promiscuous mode */ 1694 vap->iv_stats.is_rx_mgtdiscard++; 1695 break; 1696 } 1697 1698 /* 1699 * disassoc frame format 1700 * [2] reason 1701 */ 1702 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1703 reason = le16toh(*(uint16_t *)frm); 1704 1705 vap->iv_stats.is_rx_disassoc++; 1706 vap->iv_stats.is_rx_disassoc_code = reason; 1707 IEEE80211_NODE_STAT(ni, rx_disassoc); 1708 1709 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1710 "recv disassociate (reason %d)", reason); 1711 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1712 break; 1713 } 1714 1715 case IEEE80211_FC0_SUBTYPE_ACTION: 1716 if (vap->iv_state == IEEE80211_S_RUN) { 1717 if (ieee80211_parse_action(ni, m0) == 0) 1718 ic->ic_recv_action(ni, wh, frm, efrm); 1719 } else 1720 vap->iv_stats.is_rx_mgtdiscard++; 1721 break; 1722 1723 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1724 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1725 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1726 vap->iv_stats.is_rx_mgtdiscard++; 1727 return; 1728 default: 1729 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1730 wh, "mgt", "subtype 0x%x not handled", subtype); 1731 vap->iv_stats.is_rx_badsubtype++; 1732 break; 1733 } 1734 #undef ISREASSOC 1735 #undef ISPROBE 1736 } 1737 1738 static void 1739 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1740 { 1741 } 1742