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 */ 27 28 /* 29 * IEEE 802.11 Station mode support. 30 */ 31 #include "opt_inet.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_media.h> 49 #include <net/if_llc.h> 50 #include <net/ethernet.h> 51 #include <net/route.h> 52 53 #include <net/bpf.h> 54 55 #include <netproto/802_11/ieee80211_var.h> 56 #include <netproto/802_11/ieee80211_sta.h> 57 #include <netproto/802_11/ieee80211_input.h> 58 #ifdef IEEE80211_SUPPORT_SUPERG 59 #include <netproto/802_11/ieee80211_superg.h> 60 #endif 61 62 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 63 64 static void sta_vattach(struct ieee80211vap *); 65 static void sta_beacon_miss(struct ieee80211vap *); 66 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 67 static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 68 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 69 int subtype, int rssi, int nf); 70 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 71 72 void 73 ieee80211_sta_attach(struct ieee80211com *ic) 74 { 75 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 76 } 77 78 void 79 ieee80211_sta_detach(struct ieee80211com *ic) 80 { 81 } 82 83 static void 84 sta_vdetach(struct ieee80211vap *vap) 85 { 86 } 87 88 static void 89 sta_vattach(struct ieee80211vap *vap) 90 { 91 vap->iv_newstate = sta_newstate; 92 vap->iv_input = sta_input; 93 vap->iv_recv_mgmt = sta_recv_mgmt; 94 vap->iv_recv_ctl = sta_recv_ctl; 95 vap->iv_opdetach = sta_vdetach; 96 vap->iv_bmiss = sta_beacon_miss; 97 } 98 99 /* 100 * Handle a beacon miss event. The common code filters out 101 * spurious events that can happen when scanning and/or before 102 * reaching RUN state. 103 */ 104 static void 105 sta_beacon_miss(struct ieee80211vap *vap) 106 { 107 struct ieee80211com *ic = vap->iv_ic; 108 109 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 110 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 111 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 112 113 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 114 "beacon miss, mode %s state %s\n", 115 ieee80211_opmode_name[vap->iv_opmode], 116 ieee80211_state_name[vap->iv_state]); 117 118 if (vap->iv_state == IEEE80211_S_CSA) { 119 /* 120 * A Channel Switch is pending; assume we missed the 121 * beacon that would've completed the process and just 122 * force the switch. If we made a mistake we'll not 123 * find the AP on the new channel and fall back to a 124 * normal scan. 125 */ 126 ieee80211_csa_completeswitch(ic); 127 return; 128 } 129 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 130 /* 131 * Send a directed probe req before falling back to a 132 * scan; if we receive a response ic_bmiss_count will 133 * be reset. Some cards mistakenly report beacon miss 134 * so this avoids the expensive scan if the ap is 135 * still there. 136 */ 137 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 138 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 139 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 140 return; 141 } 142 vap->iv_bmiss_count = 0; 143 vap->iv_stats.is_beacon_miss++; 144 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 145 #ifdef IEEE80211_SUPPORT_SUPERG 146 struct ieee80211com *ic = vap->iv_ic; 147 148 /* 149 * If we receive a beacon miss interrupt when using 150 * dynamic turbo, attempt to switch modes before 151 * reassociating. 152 */ 153 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 154 ieee80211_dturbo_switch(vap, 155 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 156 #endif 157 /* 158 * Try to reassociate before scanning for a new ap. 159 */ 160 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 161 } else { 162 /* 163 * Somebody else is controlling state changes (e.g. 164 * a user-mode app) don't do anything that would 165 * confuse them; just drop into scan mode so they'll 166 * notified of the state change and given control. 167 */ 168 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 169 } 170 } 171 172 /* 173 * Handle deauth with reason. We retry only for 174 * the cases where we might succeed. Otherwise 175 * we downgrade the ap and scan. 176 */ 177 static void 178 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 179 { 180 switch (reason) { 181 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 182 case IEEE80211_STATUS_TIMEOUT: 183 case IEEE80211_REASON_ASSOC_EXPIRE: 184 case IEEE80211_REASON_NOT_AUTHED: 185 case IEEE80211_REASON_NOT_ASSOCED: 186 case IEEE80211_REASON_ASSOC_LEAVE: 187 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 188 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 189 break; 190 default: 191 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 192 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 193 ieee80211_check_scan_current(vap); 194 break; 195 } 196 } 197 198 /* 199 * IEEE80211_M_STA vap state machine handler. 200 * This routine handles the main states in the 802.11 protocol. 201 */ 202 static int 203 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 204 { 205 struct ieee80211com *ic = vap->iv_ic; 206 struct ieee80211_node *ni; 207 enum ieee80211_state ostate; 208 209 ostate = vap->iv_state; 210 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 211 __func__, ieee80211_state_name[ostate], 212 ieee80211_state_name[nstate], arg); 213 vap->iv_state = nstate; /* state transition */ 214 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 215 if (ostate != IEEE80211_S_SCAN) 216 ieee80211_cancel_scan(vap); /* background scan */ 217 ni = vap->iv_bss; /* NB: no reference held */ 218 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 219 callout_stop(&vap->iv_swbmiss); 220 switch (nstate) { 221 case IEEE80211_S_INIT: 222 switch (ostate) { 223 case IEEE80211_S_SLEEP: 224 /* XXX wakeup */ 225 case IEEE80211_S_RUN: 226 IEEE80211_SEND_MGMT(ni, 227 IEEE80211_FC0_SUBTYPE_DISASSOC, 228 IEEE80211_REASON_ASSOC_LEAVE); 229 ieee80211_sta_leave(ni); 230 break; 231 case IEEE80211_S_ASSOC: 232 IEEE80211_SEND_MGMT(ni, 233 IEEE80211_FC0_SUBTYPE_DEAUTH, 234 IEEE80211_REASON_AUTH_LEAVE); 235 break; 236 case IEEE80211_S_SCAN: 237 ieee80211_cancel_scan(vap); 238 break; 239 default: 240 goto invalid; 241 } 242 if (ostate != IEEE80211_S_INIT) { 243 /* NB: optimize INIT -> INIT case */ 244 ieee80211_reset_bss(vap); 245 } 246 if (vap->iv_auth->ia_detach != NULL) 247 vap->iv_auth->ia_detach(vap); 248 break; 249 case IEEE80211_S_SCAN: 250 switch (ostate) { 251 case IEEE80211_S_INIT: 252 /* 253 * Initiate a scan. We can come here as a result 254 * of an IEEE80211_IOC_SCAN_REQ too in which case 255 * the vap will be marked with IEEE80211_FEXT_SCANREQ 256 * and the scan request parameters will be present 257 * in iv_scanreq. Otherwise we do the default. 258 */ 259 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 260 ieee80211_check_scan(vap, 261 vap->iv_scanreq_flags, 262 vap->iv_scanreq_duration, 263 vap->iv_scanreq_mindwell, 264 vap->iv_scanreq_maxdwell, 265 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 266 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 267 } else 268 ieee80211_check_scan_current(vap); 269 break; 270 case IEEE80211_S_SCAN: 271 case IEEE80211_S_AUTH: 272 case IEEE80211_S_ASSOC: 273 /* 274 * These can happen either because of a timeout 275 * on an assoc/auth response or because of a 276 * change in state that requires a reset. For 277 * the former we're called with a non-zero arg 278 * that is the cause for the failure; pass this 279 * to the scan code so it can update state. 280 * Otherwise trigger a new scan unless we're in 281 * manual roaming mode in which case an application 282 * must issue an explicit scan request. 283 */ 284 if (arg != 0) 285 ieee80211_scan_assoc_fail(vap, 286 vap->iv_bss->ni_macaddr, arg); 287 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 288 ieee80211_check_scan_current(vap); 289 break; 290 case IEEE80211_S_RUN: /* beacon miss */ 291 /* 292 * Beacon miss. Notify user space and if not 293 * under control of a user application (roaming 294 * manual) kick off a scan to re-connect. 295 */ 296 ieee80211_sta_leave(ni); 297 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 298 ieee80211_check_scan_current(vap); 299 break; 300 default: 301 goto invalid; 302 } 303 break; 304 case IEEE80211_S_AUTH: 305 switch (ostate) { 306 case IEEE80211_S_INIT: 307 case IEEE80211_S_SCAN: 308 IEEE80211_SEND_MGMT(ni, 309 IEEE80211_FC0_SUBTYPE_AUTH, 1); 310 break; 311 case IEEE80211_S_AUTH: 312 case IEEE80211_S_ASSOC: 313 switch (arg & 0xff) { 314 case IEEE80211_FC0_SUBTYPE_AUTH: 315 /* ??? */ 316 IEEE80211_SEND_MGMT(ni, 317 IEEE80211_FC0_SUBTYPE_AUTH, 2); 318 break; 319 case IEEE80211_FC0_SUBTYPE_DEAUTH: 320 sta_authretry(vap, ni, arg>>8); 321 break; 322 } 323 break; 324 case IEEE80211_S_RUN: 325 switch (arg & 0xff) { 326 case IEEE80211_FC0_SUBTYPE_AUTH: 327 IEEE80211_SEND_MGMT(ni, 328 IEEE80211_FC0_SUBTYPE_AUTH, 2); 329 vap->iv_state = ostate; /* stay RUN */ 330 break; 331 case IEEE80211_FC0_SUBTYPE_DEAUTH: 332 ieee80211_sta_leave(ni); 333 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 334 /* try to reauth */ 335 IEEE80211_SEND_MGMT(ni, 336 IEEE80211_FC0_SUBTYPE_AUTH, 1); 337 } 338 break; 339 } 340 break; 341 default: 342 goto invalid; 343 } 344 break; 345 case IEEE80211_S_ASSOC: 346 switch (ostate) { 347 case IEEE80211_S_AUTH: 348 case IEEE80211_S_ASSOC: 349 IEEE80211_SEND_MGMT(ni, 350 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 351 break; 352 case IEEE80211_S_SLEEP: /* cannot happen */ 353 case IEEE80211_S_RUN: 354 ieee80211_sta_leave(ni); 355 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 356 IEEE80211_SEND_MGMT(ni, arg ? 357 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 358 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 359 } 360 break; 361 default: 362 goto invalid; 363 } 364 break; 365 case IEEE80211_S_RUN: 366 if (vap->iv_flags & IEEE80211_F_WPA) { 367 /* XXX validate prerequisites */ 368 } 369 switch (ostate) { 370 case IEEE80211_S_RUN: 371 case IEEE80211_S_CSA: 372 break; 373 case IEEE80211_S_AUTH: /* when join is done in fw */ 374 case IEEE80211_S_ASSOC: 375 #ifdef IEEE80211_DEBUG 376 if (ieee80211_msg_debug(vap)) { 377 ieee80211_note(vap, "%s with %6D ssid ", 378 (vap->iv_opmode == IEEE80211_M_STA ? 379 "associated" : "synchronized"), 380 ni->ni_bssid, ":"); 381 ieee80211_print_essid(vap->iv_bss->ni_essid, 382 ni->ni_esslen); 383 /* XXX MCS/HT */ 384 kprintf(" channel %d start %uMb\n", 385 ieee80211_chan2ieee(ic, ic->ic_curchan), 386 IEEE80211_RATE2MBS(ni->ni_txrate)); 387 } 388 #endif 389 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 390 ieee80211_notify_node_join(ni, 391 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 392 break; 393 case IEEE80211_S_SLEEP: 394 ieee80211_sta_pwrsave(vap, 0); 395 break; 396 default: 397 goto invalid; 398 } 399 ieee80211_sync_curchan(ic); 400 if (ostate != IEEE80211_S_RUN && 401 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 402 /* 403 * Start s/w beacon miss timer for devices w/o 404 * hardware support. We fudge a bit here since 405 * we're doing this in software. 406 */ 407 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 408 2 * vap->iv_bmissthreshold * ni->ni_intval); 409 vap->iv_swbmiss_count = 0; 410 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 411 ieee80211_swbmiss_callout, vap); 412 } 413 /* 414 * When 802.1x is not in use mark the port authorized 415 * at this point so traffic can flow. 416 */ 417 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 418 ieee80211_node_authorize(ni); 419 /* 420 * Fake association when joining an existing bss. 421 */ 422 if (ic->ic_newassoc != NULL) 423 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 424 break; 425 case IEEE80211_S_CSA: 426 if (ostate != IEEE80211_S_RUN) 427 goto invalid; 428 break; 429 case IEEE80211_S_SLEEP: 430 ieee80211_sta_pwrsave(vap, 1); 431 break; 432 default: 433 invalid: 434 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 435 "%s: unexpected state transition %s -> %s\n", __func__, 436 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 437 break; 438 } 439 return 0; 440 } 441 442 /* 443 * Return non-zero if the frame is an echo of a multicast 444 * frame sent by ourself. The dir is known to be DSTODS. 445 */ 446 static __inline int 447 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 448 { 449 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 450 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 451 const uint8_t *sa; 452 453 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 454 455 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 456 return 0; 457 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 458 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 459 #undef WH4 460 #undef QWH4 461 } 462 463 /* 464 * Return non-zero if the frame is an echo of a multicast 465 * frame sent by ourself. The dir is known to be FROMDS. 466 */ 467 static __inline int 468 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 469 { 470 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 471 472 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 473 return 0; 474 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 475 } 476 477 /* 478 * Decide if a received management frame should be 479 * printed when debugging is enabled. This filters some 480 * of the less interesting frames that come frequently 481 * (e.g. beacons). 482 */ 483 static __inline int 484 doprint(struct ieee80211vap *vap, int subtype) 485 { 486 switch (subtype) { 487 case IEEE80211_FC0_SUBTYPE_BEACON: 488 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 489 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 490 return 0; 491 } 492 return 1; 493 } 494 495 /* 496 * Process a received frame. The node associated with the sender 497 * should be supplied. If nothing was found in the node table then 498 * the caller is assumed to supply a reference to iv_bss instead. 499 * The RSSI and a timestamp are also supplied. The RSSI data is used 500 * during AP scanning to select a AP to associate with; it can have 501 * any units so long as values have consistent units and higher values 502 * mean ``better signal''. The receive timestamp is currently not used 503 * by the 802.11 layer. 504 */ 505 static int 506 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 507 { 508 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 509 #define HAS_SEQ(type) ((type & 0x4) == 0) 510 struct ieee80211vap *vap = ni->ni_vap; 511 struct ieee80211com *ic = ni->ni_ic; 512 struct ifnet *ifp = vap->iv_ifp; 513 struct ieee80211_frame *wh; 514 struct ieee80211_key *key; 515 struct ether_header *eh; 516 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 517 uint8_t dir, type, subtype, qos; 518 uint8_t *bssid; 519 uint16_t rxseq; 520 521 if (m->m_flags & M_AMPDU_MPDU) { 522 /* 523 * Fastpath for A-MPDU reorder q resubmission. Frames 524 * w/ M_AMPDU_MPDU marked have already passed through 525 * here but were received out of order and been held on 526 * the reorder queue. When resubmitted they are marked 527 * with the M_AMPDU_MPDU flag and we can bypass most of 528 * the normal processing. 529 */ 530 wh = mtod(m, struct ieee80211_frame *); 531 type = IEEE80211_FC0_TYPE_DATA; 532 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 533 subtype = IEEE80211_FC0_SUBTYPE_QOS; 534 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 535 goto resubmit_ampdu; 536 } 537 538 KASSERT(ni != NULL, ("null node")); 539 ni->ni_inact = ni->ni_inact_reload; 540 541 type = -1; /* undefined */ 542 543 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 544 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 545 ni->ni_macaddr, NULL, 546 "too short (1): len %u", m->m_pkthdr.len); 547 vap->iv_stats.is_rx_tooshort++; 548 goto out; 549 } 550 /* 551 * Bit of a cheat here, we use a pointer for a 3-address 552 * frame format but don't reference fields past outside 553 * ieee80211_frame_min w/o first validating the data is 554 * present. 555 */ 556 wh = mtod(m, struct ieee80211_frame *); 557 558 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 559 IEEE80211_FC0_VERSION_0) { 560 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 561 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 562 wh->i_fc[0], wh->i_fc[1]); 563 vap->iv_stats.is_rx_badversion++; 564 goto err; 565 } 566 567 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 568 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 569 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 570 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 571 bssid = wh->i_addr2; 572 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 573 /* not interested in */ 574 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 575 bssid, NULL, "%s", "not to bss"); 576 vap->iv_stats.is_rx_wrongbss++; 577 goto out; 578 } 579 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 580 ni->ni_noise = nf; 581 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 582 uint8_t tid = ieee80211_gettid(wh); 583 if (IEEE80211_QOS_HAS_SEQ(wh) && 584 TID_TO_WME_AC(tid) >= WME_AC_VI) 585 ic->ic_wme.wme_hipri_traffic++; 586 rxseq = le16toh(*(uint16_t *)wh->i_seq); 587 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 588 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 589 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 590 /* duplicate, discard */ 591 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 592 bssid, "duplicate", 593 "seqno <%u,%u> fragno <%u,%u> tid %u", 594 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 595 ni->ni_rxseqs[tid] >> 596 IEEE80211_SEQ_SEQ_SHIFT, 597 rxseq & IEEE80211_SEQ_FRAG_MASK, 598 ni->ni_rxseqs[tid] & 599 IEEE80211_SEQ_FRAG_MASK, 600 tid); 601 vap->iv_stats.is_rx_dup++; 602 IEEE80211_NODE_STAT(ni, rx_dup); 603 goto out; 604 } 605 ni->ni_rxseqs[tid] = rxseq; 606 } 607 } 608 609 switch (type) { 610 case IEEE80211_FC0_TYPE_DATA: 611 hdrspace = ieee80211_hdrspace(ic, wh); 612 if (m->m_len < hdrspace && 613 (m = m_pullup(m, hdrspace)) == NULL) { 614 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 615 ni->ni_macaddr, NULL, 616 "data too short: expecting %u", hdrspace); 617 vap->iv_stats.is_rx_tooshort++; 618 goto out; /* XXX */ 619 } 620 /* 621 * Handle A-MPDU re-ordering. If the frame is to be 622 * processed directly then ieee80211_ampdu_reorder 623 * will return 0; otherwise it has consumed the mbuf 624 * and we should do nothing more with it. 625 */ 626 if ((m->m_flags & M_AMPDU) && 627 (dir == IEEE80211_FC1_DIR_FROMDS || 628 dir == IEEE80211_FC1_DIR_DSTODS) && 629 ieee80211_ampdu_reorder(ni, m) != 0) { 630 m = NULL; 631 goto out; 632 } 633 resubmit_ampdu: 634 if (dir == IEEE80211_FC1_DIR_FROMDS) { 635 if ((ifp->if_flags & IFF_SIMPLEX) && 636 isfromds_mcastecho(vap, wh)) { 637 /* 638 * In IEEE802.11 network, multicast 639 * packets sent from "me" are broadcast 640 * from the AP; silently discard for 641 * SIMPLEX interface. 642 */ 643 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 644 wh, "data", "%s", "multicast echo"); 645 vap->iv_stats.is_rx_mcastecho++; 646 goto out; 647 } 648 if ((vap->iv_flags & IEEE80211_F_DWDS) && 649 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 650 /* 651 * DWDS sta's must drop 3-address mcast frames 652 * as they will be sent separately as a 4-addr 653 * frame. Accepting the 3-addr frame will 654 * confuse the bridge into thinking the sending 655 * sta is located at the end of WDS link. 656 */ 657 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 658 "3-address data", "%s", "DWDS enabled"); 659 vap->iv_stats.is_rx_mcastecho++; 660 goto out; 661 } 662 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 663 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 664 IEEE80211_DISCARD(vap, 665 IEEE80211_MSG_INPUT, wh, "4-address data", 666 "%s", "DWDS not enabled"); 667 vap->iv_stats.is_rx_wrongdir++; 668 goto out; 669 } 670 if ((ifp->if_flags & IFF_SIMPLEX) && 671 isdstods_mcastecho(vap, wh)) { 672 /* 673 * In IEEE802.11 network, multicast 674 * packets sent from "me" are broadcast 675 * from the AP; silently discard for 676 * SIMPLEX interface. 677 */ 678 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 679 "4-address data", "%s", "multicast echo"); 680 vap->iv_stats.is_rx_mcastecho++; 681 goto out; 682 } 683 } else { 684 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 685 "data", "incorrect dir 0x%x", dir); 686 vap->iv_stats.is_rx_wrongdir++; 687 goto out; 688 } 689 690 /* 691 * Handle privacy requirements. Note that we 692 * must not be preempted from here until after 693 * we (potentially) call ieee80211_crypto_demic; 694 * otherwise we may violate assumptions in the 695 * crypto cipher modules used to do delayed update 696 * of replay sequence numbers. 697 */ 698 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 699 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 700 /* 701 * Discard encrypted frames when privacy is off. 702 */ 703 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 704 wh, "WEP", "%s", "PRIVACY off"); 705 vap->iv_stats.is_rx_noprivacy++; 706 IEEE80211_NODE_STAT(ni, rx_noprivacy); 707 goto out; 708 } 709 key = ieee80211_crypto_decap(ni, m, hdrspace); 710 if (key == NULL) { 711 /* NB: stats+msgs handled in crypto_decap */ 712 IEEE80211_NODE_STAT(ni, rx_wepfail); 713 goto out; 714 } 715 wh = mtod(m, struct ieee80211_frame *); 716 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 717 } else { 718 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 719 key = NULL; 720 } 721 722 /* 723 * Save QoS bits for use below--before we strip the header. 724 */ 725 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 726 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 727 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 728 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 729 } else 730 qos = 0; 731 732 /* 733 * Next up, any fragmentation. 734 */ 735 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 736 m = ieee80211_defrag(ni, m, hdrspace); 737 if (m == NULL) { 738 /* Fragment dropped or frame not complete yet */ 739 goto out; 740 } 741 } 742 wh = NULL; /* no longer valid, catch any uses */ 743 744 /* 745 * Next strip any MSDU crypto bits. 746 */ 747 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 748 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 749 ni->ni_macaddr, "data", "%s", "demic error"); 750 vap->iv_stats.is_rx_demicfail++; 751 IEEE80211_NODE_STAT(ni, rx_demicfail); 752 goto out; 753 } 754 755 /* copy to listener after decrypt */ 756 if (ieee80211_radiotap_active_vap(vap)) 757 ieee80211_radiotap_rx(vap, m); 758 need_tap = 0; 759 760 /* 761 * Finally, strip the 802.11 header. 762 */ 763 m = ieee80211_decap(vap, m, hdrspace); 764 if (m == NULL) { 765 /* XXX mask bit to check for both */ 766 /* don't count Null data frames as errors */ 767 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 768 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 769 goto out; 770 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 771 ni->ni_macaddr, "data", "%s", "decap error"); 772 vap->iv_stats.is_rx_decap++; 773 IEEE80211_NODE_STAT(ni, rx_decap); 774 goto err; 775 } 776 eh = mtod(m, struct ether_header *); 777 if (!ieee80211_node_is_authorized(ni)) { 778 /* 779 * Deny any non-PAE frames received prior to 780 * authorization. For open/shared-key 781 * authentication the port is mark authorized 782 * after authentication completes. For 802.1x 783 * the port is not marked authorized by the 784 * authenticator until the handshake has completed. 785 */ 786 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 787 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 788 eh->ether_shost, "data", 789 "unauthorized port: ether type 0x%x len %u", 790 eh->ether_type, m->m_pkthdr.len); 791 vap->iv_stats.is_rx_unauth++; 792 IEEE80211_NODE_STAT(ni, rx_unauth); 793 goto err; 794 } 795 } else { 796 /* 797 * When denying unencrypted frames, discard 798 * any non-PAE frames received without encryption. 799 */ 800 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 801 (key == NULL && (m->m_flags & M_WEP) == 0) && 802 eh->ether_type != htons(ETHERTYPE_PAE)) { 803 /* 804 * Drop unencrypted frames. 805 */ 806 vap->iv_stats.is_rx_unencrypted++; 807 IEEE80211_NODE_STAT(ni, rx_unencrypted); 808 goto out; 809 } 810 } 811 /* XXX require HT? */ 812 if (qos & IEEE80211_QOS_AMSDU) { 813 m = ieee80211_decap_amsdu(ni, m); 814 if (m == NULL) 815 return IEEE80211_FC0_TYPE_DATA; 816 } else { 817 #ifdef IEEE80211_SUPPORT_SUPERG 818 m = ieee80211_decap_fastframe(vap, ni, m); 819 if (m == NULL) 820 return IEEE80211_FC0_TYPE_DATA; 821 #endif 822 } 823 ieee80211_deliver_data(vap, ni, m); 824 return IEEE80211_FC0_TYPE_DATA; 825 826 case IEEE80211_FC0_TYPE_MGT: 827 vap->iv_stats.is_rx_mgmt++; 828 IEEE80211_NODE_STAT(ni, rx_mgmt); 829 if (dir != IEEE80211_FC1_DIR_NODS) { 830 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 831 wh, "data", "incorrect dir 0x%x", dir); 832 vap->iv_stats.is_rx_wrongdir++; 833 goto err; 834 } 835 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 836 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 837 ni->ni_macaddr, "mgt", "too short: len %u", 838 m->m_pkthdr.len); 839 vap->iv_stats.is_rx_tooshort++; 840 goto out; 841 } 842 #ifdef IEEE80211_DEBUG 843 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 844 ieee80211_msg_dumppkts(vap)) { 845 if_printf(ifp, "received %s from %6D rssi %d\n", 846 ieee80211_mgt_subtype_name[subtype >> 847 IEEE80211_FC0_SUBTYPE_SHIFT], 848 wh->i_addr2, ":", rssi); 849 } 850 #endif 851 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 852 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 853 /* 854 * Only shared key auth frames with a challenge 855 * should be encrypted, discard all others. 856 */ 857 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 858 wh, ieee80211_mgt_subtype_name[subtype >> 859 IEEE80211_FC0_SUBTYPE_SHIFT], 860 "%s", "WEP set but not permitted"); 861 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 862 goto out; 863 } 864 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 865 /* 866 * Discard encrypted frames when privacy is off. 867 */ 868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 869 wh, "mgt", "%s", "WEP set but PRIVACY off"); 870 vap->iv_stats.is_rx_noprivacy++; 871 goto out; 872 } 873 hdrspace = ieee80211_hdrspace(ic, wh); 874 key = ieee80211_crypto_decap(ni, m, hdrspace); 875 if (key == NULL) { 876 /* NB: stats+msgs handled in crypto_decap */ 877 goto out; 878 } 879 wh = mtod(m, struct ieee80211_frame *); 880 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 881 } 882 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 883 goto out; 884 885 case IEEE80211_FC0_TYPE_CTL: 886 vap->iv_stats.is_rx_ctl++; 887 IEEE80211_NODE_STAT(ni, rx_ctrl); 888 vap->iv_recv_ctl(ni, m, subtype); 889 goto out; 890 891 default: 892 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 893 wh, NULL, "bad frame type 0x%x", type); 894 /* should not come here */ 895 break; 896 } 897 err: 898 ifp->if_ierrors++; 899 out: 900 if (m != NULL) { 901 if (need_tap && ieee80211_radiotap_active_vap(vap)) 902 ieee80211_radiotap_rx(vap, m); 903 m_freem(m); 904 } 905 return type; 906 #undef SEQ_LEQ 907 } 908 909 static void 910 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 911 int rssi, int nf, uint16_t seq, uint16_t status) 912 { 913 struct ieee80211vap *vap = ni->ni_vap; 914 915 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 916 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 917 ni->ni_macaddr, "open auth", 918 "bad sta auth mode %u", ni->ni_authmode); 919 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 920 return; 921 } 922 if (vap->iv_state != IEEE80211_S_AUTH || 923 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 924 vap->iv_stats.is_rx_bad_auth++; 925 return; 926 } 927 if (status != 0) { 928 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 929 ni, "open auth failed (reason %d)", status); 930 vap->iv_stats.is_rx_auth_fail++; 931 vap->iv_stats.is_rx_authfail_code = status; 932 ieee80211_new_state(vap, IEEE80211_S_SCAN, 933 IEEE80211_SCAN_FAIL_STATUS); 934 } else 935 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 936 } 937 938 static void 939 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 940 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 941 uint16_t seq, uint16_t status) 942 { 943 struct ieee80211vap *vap = ni->ni_vap; 944 uint8_t *challenge; 945 946 /* 947 * NB: this can happen as we allow pre-shared key 948 * authentication to be enabled w/o wep being turned 949 * on so that configuration of these can be done 950 * in any order. It may be better to enforce the 951 * ordering in which case this check would just be 952 * for sanity/consistency. 953 */ 954 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 955 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 956 ni->ni_macaddr, "shared key auth", 957 "%s", " PRIVACY is disabled"); 958 goto bad; 959 } 960 /* 961 * Pre-shared key authentication is evil; accept 962 * it only if explicitly configured (it is supported 963 * mainly for compatibility with clients like OS X). 964 */ 965 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 966 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 967 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 968 ni->ni_macaddr, "shared key auth", 969 "bad sta auth mode %u", ni->ni_authmode); 970 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 971 goto bad; 972 } 973 974 challenge = NULL; 975 if (frm + 1 < efrm) { 976 if ((frm[1] + 2) > (efrm - frm)) { 977 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 978 ni->ni_macaddr, "shared key auth", 979 "ie %d/%d too long", 980 frm[0], (int)((frm[1] + 2) - (efrm - frm))); 981 vap->iv_stats.is_rx_bad_auth++; 982 goto bad; 983 } 984 if (*frm == IEEE80211_ELEMID_CHALLENGE) 985 challenge = frm; 986 frm += frm[1] + 2; 987 } 988 switch (seq) { 989 case IEEE80211_AUTH_SHARED_CHALLENGE: 990 case IEEE80211_AUTH_SHARED_RESPONSE: 991 if (challenge == NULL) { 992 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 993 ni->ni_macaddr, "shared key auth", 994 "%s", "no challenge"); 995 vap->iv_stats.is_rx_bad_auth++; 996 goto bad; 997 } 998 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 999 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1000 ni->ni_macaddr, "shared key auth", 1001 "bad challenge len %d", challenge[1]); 1002 vap->iv_stats.is_rx_bad_auth++; 1003 goto bad; 1004 } 1005 default: 1006 break; 1007 } 1008 if (vap->iv_state != IEEE80211_S_AUTH) 1009 return; 1010 switch (seq) { 1011 case IEEE80211_AUTH_SHARED_PASS: 1012 if (ni->ni_challenge != NULL) { 1013 kfree(ni->ni_challenge, M_80211_NODE); 1014 ni->ni_challenge = NULL; 1015 } 1016 if (status != 0) { 1017 IEEE80211_NOTE_FRAME(vap, 1018 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1019 "shared key auth failed (reason %d)", status); 1020 vap->iv_stats.is_rx_auth_fail++; 1021 vap->iv_stats.is_rx_authfail_code = status; 1022 return; 1023 } 1024 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1025 break; 1026 case IEEE80211_AUTH_SHARED_CHALLENGE: 1027 if (!ieee80211_alloc_challenge(ni)) 1028 return; 1029 /* XXX could optimize by passing recvd challenge */ 1030 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1031 IEEE80211_SEND_MGMT(ni, 1032 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1033 break; 1034 default: 1035 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1036 wh, "shared key auth", "bad seq %d", seq); 1037 vap->iv_stats.is_rx_bad_auth++; 1038 return; 1039 } 1040 return; 1041 bad: 1042 /* 1043 * Kick the state machine. This short-circuits 1044 * using the mgt frame timeout to trigger the 1045 * state transition. 1046 */ 1047 if (vap->iv_state == IEEE80211_S_AUTH) 1048 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1049 IEEE80211_SCAN_FAIL_STATUS); 1050 } 1051 1052 static int 1053 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1054 const struct ieee80211_frame *wh) 1055 { 1056 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1057 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1058 u_int len = frm[1], qosinfo; 1059 int i; 1060 1061 if (len < sizeof(struct ieee80211_wme_param)-2) { 1062 IEEE80211_DISCARD_IE(vap, 1063 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1064 wh, "WME", "too short, len %u", len); 1065 return -1; 1066 } 1067 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1068 qosinfo &= WME_QOSINFO_COUNT; 1069 /* XXX do proper check for wraparound */ 1070 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1071 return 0; 1072 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1073 for (i = 0; i < WME_NUM_AC; i++) { 1074 struct wmeParams *wmep = 1075 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1076 /* NB: ACI not used */ 1077 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1078 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1079 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1080 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1081 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1082 frm += 4; 1083 } 1084 wme->wme_wmeChanParams.cap_info = qosinfo; 1085 return 1; 1086 #undef MS 1087 } 1088 1089 /* 1090 * Process 11h Channel Switch Announcement (CSA) ie. If this 1091 * is the first CSA then initiate the switch. Otherwise we 1092 * track state and trigger completion and/or cancel of the switch. 1093 * XXX should be public for IBSS use 1094 */ 1095 static void 1096 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1097 const struct ieee80211_frame *wh) 1098 { 1099 struct ieee80211com *ic = vap->iv_ic; 1100 const struct ieee80211_csa_ie *csa = 1101 (const struct ieee80211_csa_ie *) frm; 1102 1103 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1104 ("state %s", ieee80211_state_name[vap->iv_state])); 1105 1106 if (csa->csa_mode > 1) { 1107 IEEE80211_DISCARD_IE(vap, 1108 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1109 wh, "CSA", "invalid mode %u", csa->csa_mode); 1110 return; 1111 } 1112 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1113 /* 1114 * Convert the channel number to a channel reference. We 1115 * try first to preserve turbo attribute of the current 1116 * channel then fallback. Note this will not work if the 1117 * CSA specifies a channel that requires a band switch (e.g. 1118 * 11a => 11g). This is intentional as 11h is defined only 1119 * for 5GHz/11a and because the switch does not involve a 1120 * reassociation, protocol state (capabilities, negotated 1121 * rates, etc) may/will be wrong. 1122 */ 1123 struct ieee80211_channel *c = 1124 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1125 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1126 if (c == NULL) { 1127 c = ieee80211_find_channel_byieee(ic, 1128 csa->csa_newchan, 1129 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1130 if (c == NULL) { 1131 IEEE80211_DISCARD_IE(vap, 1132 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1133 wh, "CSA", "invalid channel %u", 1134 csa->csa_newchan); 1135 goto done; 1136 } 1137 } 1138 #if IEEE80211_CSA_COUNT_MIN > 0 1139 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1140 /* 1141 * Require at least IEEE80211_CSA_COUNT_MIN count to 1142 * reduce the risk of being redirected by a fabricated 1143 * CSA. If a valid CSA is dropped we'll still get a 1144 * beacon miss when the AP leaves the channel so we'll 1145 * eventually follow to the new channel. 1146 * 1147 * NOTE: this violates the 11h spec that states that 1148 * count may be any value and if 0 then a switch 1149 * should happen asap. 1150 */ 1151 IEEE80211_DISCARD_IE(vap, 1152 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1153 wh, "CSA", "count %u too small, must be >= %u", 1154 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1155 goto done; 1156 } 1157 #endif 1158 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1159 } else { 1160 /* 1161 * Validate this ie against the initial CSA. We require 1162 * mode and channel not change and the count must be 1163 * monotonically decreasing. This may be pointless and 1164 * canceling the switch as a result may be too paranoid but 1165 * in the worst case if we drop out of CSA because of this 1166 * and the AP does move then we'll just end up taking a 1167 * beacon miss and scan to find the AP. 1168 * 1169 * XXX may want <= on count as we also process ProbeResp 1170 * frames and those may come in w/ the same count as the 1171 * previous beacon; but doing so leaves us open to a stuck 1172 * count until we add a dead-man timer 1173 */ 1174 if (!(csa->csa_count < ic->ic_csa_count && 1175 csa->csa_mode == ic->ic_csa_mode && 1176 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1177 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1178 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1179 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1180 ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count, 1181 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1182 ieee80211_csa_cancelswitch(ic); 1183 } else { 1184 if (csa->csa_count <= 1) 1185 ieee80211_csa_completeswitch(ic); 1186 else 1187 ic->ic_csa_count = csa->csa_count; 1188 } 1189 } 1190 done: 1191 ; 1192 } 1193 1194 /* 1195 * Return non-zero if a background scan may be continued: 1196 * o bg scan is active 1197 * o no channel switch is pending 1198 * o there has not been any traffic recently 1199 * 1200 * Note we do not check if there is an administrative enable; 1201 * this is only done to start the scan. We assume that any 1202 * change in state will be accompanied by a request to cancel 1203 * active scans which will otherwise cause this test to fail. 1204 */ 1205 static __inline int 1206 contbgscan(struct ieee80211vap *vap) 1207 { 1208 struct ieee80211com *ic = vap->iv_ic; 1209 1210 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1211 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1212 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1213 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1214 } 1215 1216 /* 1217 * Return non-zero if a backgrond scan may be started: 1218 * o bg scanning is administratively enabled 1219 * o no channel switch is pending 1220 * o we are not boosted on a dynamic turbo channel 1221 * o there has not been a scan recently 1222 * o there has not been any traffic recently 1223 */ 1224 static __inline int 1225 startbgscan(struct ieee80211vap *vap) 1226 { 1227 struct ieee80211com *ic = vap->iv_ic; 1228 1229 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1230 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1231 #ifdef IEEE80211_SUPPORT_SUPERG 1232 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1233 #endif 1234 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1235 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1236 } 1237 1238 static void 1239 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1240 int subtype, int rssi, int nf) 1241 { 1242 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1243 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1244 struct ieee80211vap *vap = ni->ni_vap; 1245 struct ieee80211com *ic = ni->ni_ic; 1246 struct ieee80211_frame *wh; 1247 uint8_t *frm, *efrm; 1248 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1249 uint8_t rate; 1250 1251 wh = mtod(m0, struct ieee80211_frame *); 1252 frm = (uint8_t *)&wh[1]; 1253 efrm = mtod(m0, uint8_t *) + m0->m_len; 1254 switch (subtype) { 1255 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1256 case IEEE80211_FC0_SUBTYPE_BEACON: { 1257 struct ieee80211_scanparams scan; 1258 /* 1259 * We process beacon/probe response frames: 1260 * o when scanning, or 1261 * o station mode when associated (to collect state 1262 * updates such as 802.11g slot time) 1263 * Frames otherwise received are discarded. 1264 */ 1265 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1266 vap->iv_stats.is_rx_mgtdiscard++; 1267 return; 1268 } 1269 /* XXX probe response in sta mode when !scanning? */ 1270 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1271 return; 1272 /* 1273 * Count frame now that we know it's to be processed. 1274 */ 1275 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1276 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1277 IEEE80211_NODE_STAT(ni, rx_beacons); 1278 } else 1279 IEEE80211_NODE_STAT(ni, rx_proberesp); 1280 /* 1281 * When operating in station mode, check for state updates. 1282 * Be careful to ignore beacons received while doing a 1283 * background scan. We consider only 11g/WMM stuff right now. 1284 */ 1285 if (ni->ni_associd != 0 && 1286 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1287 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1288 /* record tsf of last beacon */ 1289 memcpy(ni->ni_tstamp.data, scan.tstamp, 1290 sizeof(ni->ni_tstamp)); 1291 /* count beacon frame for s/w bmiss handling */ 1292 vap->iv_swbmiss_count++; 1293 vap->iv_bmiss_count = 0; 1294 if (ni->ni_erp != scan.erp) { 1295 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1296 wh->i_addr2, 1297 "erp change: was 0x%x, now 0x%x", 1298 ni->ni_erp, scan.erp); 1299 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1300 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1301 ic->ic_flags |= IEEE80211_F_USEPROT; 1302 else 1303 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1304 ni->ni_erp = scan.erp; 1305 /* XXX statistic */ 1306 /* XXX driver notification */ 1307 } 1308 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1309 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1310 wh->i_addr2, 1311 "capabilities change: was 0x%x, now 0x%x", 1312 ni->ni_capinfo, scan.capinfo); 1313 /* 1314 * NB: we assume short preamble doesn't 1315 * change dynamically 1316 */ 1317 ieee80211_set_shortslottime(ic, 1318 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1319 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1320 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1321 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1322 /* XXX statistic */ 1323 } 1324 if (scan.wme != NULL && 1325 (ni->ni_flags & IEEE80211_NODE_QOS) && 1326 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1327 ieee80211_wme_updateparams(vap); 1328 #ifdef IEEE80211_SUPPORT_SUPERG 1329 if (scan.ath != NULL) 1330 ieee80211_parse_athparams(ni, scan.ath, wh); 1331 #endif 1332 if (scan.htcap != NULL && scan.htinfo != NULL && 1333 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1334 ieee80211_ht_updateparams(ni, 1335 scan.htcap, scan.htinfo); 1336 /* XXX state changes? */ 1337 } 1338 if (scan.tim != NULL) { 1339 struct ieee80211_tim_ie *tim = 1340 (struct ieee80211_tim_ie *) scan.tim; 1341 #if 0 1342 int aid = IEEE80211_AID(ni->ni_associd); 1343 int ix = aid / NBBY; 1344 int min = tim->tim_bitctl &~ 1; 1345 int max = tim->tim_len + min - 4; 1346 if ((tim->tim_bitctl&1) || 1347 (min <= ix && ix <= max && 1348 isset(tim->tim_bitmap - min, aid))) { 1349 /* 1350 * XXX Do not let bg scan kick off 1351 * we are expecting data. 1352 */ 1353 ic->ic_lastdata = ticks; 1354 ieee80211_sta_pwrsave(vap, 0); 1355 } 1356 #endif 1357 ni->ni_dtim_count = tim->tim_count; 1358 ni->ni_dtim_period = tim->tim_period; 1359 } 1360 if (scan.csa != NULL && 1361 (vap->iv_flags & IEEE80211_F_DOTH)) 1362 ieee80211_parse_csaparams(vap, scan.csa, wh); 1363 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1364 /* 1365 * No CSA ie or 11h disabled, but a channel 1366 * switch is pending; drop out so we aren't 1367 * stuck in CSA state. If the AP really is 1368 * moving we'll get a beacon miss and scan. 1369 */ 1370 ieee80211_csa_cancelswitch(ic); 1371 } 1372 /* 1373 * If scanning, pass the info to the scan module. 1374 * Otherwise, check if it's the right time to do 1375 * a background scan. Background scanning must 1376 * be enabled and we must not be operating in the 1377 * turbo phase of dynamic turbo mode. Then, 1378 * it's been a while since the last background 1379 * scan and if no data frames have come through 1380 * recently, kick off a scan. Note that this 1381 * is the mechanism by which a background scan 1382 * is started _and_ continued each time we 1383 * return on-channel to receive a beacon from 1384 * our ap. 1385 */ 1386 if (ic->ic_flags & IEEE80211_F_SCAN) { 1387 ieee80211_add_scan(vap, &scan, wh, 1388 subtype, rssi, nf); 1389 } else if (contbgscan(vap)) { 1390 ieee80211_bg_scan(vap, 0); 1391 } else if (startbgscan(vap)) { 1392 vap->iv_stats.is_scan_bg++; 1393 #if 0 1394 /* wakeup if we are sleeing */ 1395 ieee80211_set_pwrsave(vap, 0); 1396 #endif 1397 ieee80211_bg_scan(vap, 0); 1398 } 1399 return; 1400 } 1401 /* 1402 * If scanning, just pass information to the scan module. 1403 */ 1404 if (ic->ic_flags & IEEE80211_F_SCAN) { 1405 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1406 /* 1407 * Actively scanning a channel marked passive; 1408 * send a probe request now that we know there 1409 * is 802.11 traffic present. 1410 * 1411 * XXX check if the beacon we recv'd gives 1412 * us what we need and suppress the probe req 1413 */ 1414 ieee80211_probe_curchan(vap, 1); 1415 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1416 } 1417 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1418 return; 1419 } 1420 break; 1421 } 1422 1423 case IEEE80211_FC0_SUBTYPE_AUTH: { 1424 uint16_t algo, seq, status; 1425 /* 1426 * auth frame format 1427 * [2] algorithm 1428 * [2] sequence 1429 * [2] status 1430 * [tlv*] challenge 1431 */ 1432 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1433 algo = le16toh(*(uint16_t *)frm); 1434 seq = le16toh(*(uint16_t *)(frm + 2)); 1435 status = le16toh(*(uint16_t *)(frm + 4)); 1436 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1437 "recv auth frame with algorithm %d seq %d", algo, seq); 1438 1439 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1440 IEEE80211_DISCARD(vap, 1441 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1442 wh, "auth", "%s", "TKIP countermeasures enabled"); 1443 vap->iv_stats.is_rx_auth_countermeasures++; 1444 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1445 ieee80211_send_error(ni, wh->i_addr2, 1446 IEEE80211_FC0_SUBTYPE_AUTH, 1447 IEEE80211_REASON_MIC_FAILURE); 1448 } 1449 return; 1450 } 1451 if (algo == IEEE80211_AUTH_ALG_SHARED) 1452 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1453 seq, status); 1454 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1455 sta_auth_open(ni, wh, rssi, nf, seq, status); 1456 else { 1457 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1458 wh, "auth", "unsupported alg %d", algo); 1459 vap->iv_stats.is_rx_auth_unsupported++; 1460 return; 1461 } 1462 break; 1463 } 1464 1465 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1466 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1467 uint16_t capinfo, associd; 1468 uint16_t status; 1469 1470 if (vap->iv_state != IEEE80211_S_ASSOC) { 1471 vap->iv_stats.is_rx_mgtdiscard++; 1472 return; 1473 } 1474 1475 /* 1476 * asresp frame format 1477 * [2] capability information 1478 * [2] status 1479 * [2] association ID 1480 * [tlv] supported rates 1481 * [tlv] extended supported rates 1482 * [tlv] WME 1483 * [tlv] HT capabilities 1484 * [tlv] HT info 1485 */ 1486 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1487 ni = vap->iv_bss; 1488 capinfo = le16toh(*(uint16_t *)frm); 1489 frm += 2; 1490 status = le16toh(*(uint16_t *)frm); 1491 frm += 2; 1492 if (status != 0) { 1493 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1494 wh->i_addr2, "%sassoc failed (reason %d)", 1495 ISREASSOC(subtype) ? "re" : "", status); 1496 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1497 return; 1498 } 1499 associd = le16toh(*(uint16_t *)frm); 1500 frm += 2; 1501 1502 rates = xrates = wme = htcap = htinfo = NULL; 1503 while (efrm - frm > 1) { 1504 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1505 switch (*frm) { 1506 case IEEE80211_ELEMID_RATES: 1507 rates = frm; 1508 break; 1509 case IEEE80211_ELEMID_XRATES: 1510 xrates = frm; 1511 break; 1512 case IEEE80211_ELEMID_HTCAP: 1513 htcap = frm; 1514 break; 1515 case IEEE80211_ELEMID_HTINFO: 1516 htinfo = frm; 1517 break; 1518 case IEEE80211_ELEMID_VENDOR: 1519 if (iswmeoui(frm)) 1520 wme = frm; 1521 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1522 /* 1523 * Accept pre-draft HT ie's if the 1524 * standard ones have not been seen. 1525 */ 1526 if (ishtcapoui(frm)) { 1527 if (htcap == NULL) 1528 htcap = frm; 1529 } else if (ishtinfooui(frm)) { 1530 if (htinfo == NULL) 1531 htcap = frm; 1532 } 1533 } 1534 /* XXX Atheros OUI support */ 1535 break; 1536 } 1537 frm += frm[1] + 2; 1538 } 1539 1540 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1541 if (xrates != NULL) 1542 IEEE80211_VERIFY_ELEMENT(xrates, 1543 IEEE80211_RATE_MAXSIZE - rates[1], return); 1544 rate = ieee80211_setup_rates(ni, rates, xrates, 1545 IEEE80211_F_JOIN | 1546 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1547 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1548 if (rate & IEEE80211_RATE_BASIC) { 1549 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1550 wh->i_addr2, 1551 "%sassoc failed (rate set mismatch)", 1552 ISREASSOC(subtype) ? "re" : ""); 1553 vap->iv_stats.is_rx_assoc_norate++; 1554 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1555 IEEE80211_SCAN_FAIL_STATUS); 1556 return; 1557 } 1558 1559 ni->ni_capinfo = capinfo; 1560 ni->ni_associd = associd; 1561 if (ni->ni_jointime == 0) 1562 ni->ni_jointime = time_second; 1563 if (wme != NULL && 1564 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1565 ni->ni_flags |= IEEE80211_NODE_QOS; 1566 ieee80211_wme_updateparams(vap); 1567 } else 1568 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1569 /* 1570 * Setup HT state according to the negotiation. 1571 * 1572 * NB: shouldn't need to check if HT use is enabled but some 1573 * ap's send back HT ie's even when we don't indicate we 1574 * are HT capable in our AssocReq. 1575 */ 1576 if (htcap != NULL && htinfo != NULL && 1577 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1578 ieee80211_ht_node_init(ni); 1579 ieee80211_ht_updateparams(ni, htcap, htinfo); 1580 ieee80211_setup_htrates(ni, htcap, 1581 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1582 ieee80211_setup_basic_htrates(ni, htinfo); 1583 ieee80211_node_setuptxparms(ni); 1584 } else { 1585 #ifdef IEEE80211_SUPPORT_SUPERG 1586 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1587 ieee80211_ff_node_init(ni); 1588 #endif 1589 } 1590 /* 1591 * Configure state now that we are associated. 1592 * 1593 * XXX may need different/additional driver callbacks? 1594 */ 1595 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1596 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1597 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1598 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1599 } else { 1600 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1601 ic->ic_flags |= IEEE80211_F_USEBARKER; 1602 } 1603 ieee80211_set_shortslottime(ic, 1604 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1605 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1606 /* 1607 * Honor ERP protection. 1608 * 1609 * NB: ni_erp should zero for non-11g operation. 1610 */ 1611 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1612 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1613 ic->ic_flags |= IEEE80211_F_USEPROT; 1614 else 1615 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1616 IEEE80211_NOTE_MAC(vap, 1617 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1618 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1619 ISREASSOC(subtype) ? "re" : "", 1620 IEEE80211_NODE_AID(ni), 1621 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1622 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1623 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1624 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1625 ni->ni_flags & IEEE80211_NODE_HT ? 1626 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1627 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1628 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1629 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1630 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1631 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1632 ", fast-frames" : "", 1633 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1634 ", turbo" : "" 1635 ); 1636 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1637 break; 1638 } 1639 1640 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1641 uint16_t reason; 1642 1643 if (vap->iv_state == IEEE80211_S_SCAN) { 1644 vap->iv_stats.is_rx_mgtdiscard++; 1645 return; 1646 } 1647 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1648 /* NB: can happen when in promiscuous mode */ 1649 vap->iv_stats.is_rx_mgtdiscard++; 1650 break; 1651 } 1652 1653 /* 1654 * deauth frame format 1655 * [2] reason 1656 */ 1657 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1658 reason = le16toh(*(uint16_t *)frm); 1659 1660 vap->iv_stats.is_rx_deauth++; 1661 vap->iv_stats.is_rx_deauth_code = reason; 1662 IEEE80211_NODE_STAT(ni, rx_deauth); 1663 1664 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1665 "recv deauthenticate (reason %d)", reason); 1666 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1667 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1668 break; 1669 } 1670 1671 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1672 uint16_t reason; 1673 1674 if (vap->iv_state != IEEE80211_S_RUN && 1675 vap->iv_state != IEEE80211_S_ASSOC && 1676 vap->iv_state != IEEE80211_S_AUTH) { 1677 vap->iv_stats.is_rx_mgtdiscard++; 1678 return; 1679 } 1680 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1681 /* NB: can happen when in promiscuous mode */ 1682 vap->iv_stats.is_rx_mgtdiscard++; 1683 break; 1684 } 1685 1686 /* 1687 * disassoc frame format 1688 * [2] reason 1689 */ 1690 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1691 reason = le16toh(*(uint16_t *)frm); 1692 1693 vap->iv_stats.is_rx_disassoc++; 1694 vap->iv_stats.is_rx_disassoc_code = reason; 1695 IEEE80211_NODE_STAT(ni, rx_disassoc); 1696 1697 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1698 "recv disassociate (reason %d)", reason); 1699 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1700 break; 1701 } 1702 1703 case IEEE80211_FC0_SUBTYPE_ACTION: 1704 if (vap->iv_state == IEEE80211_S_RUN) { 1705 if (ieee80211_parse_action(ni, m0) == 0) 1706 ic->ic_recv_action(ni, wh, frm, efrm); 1707 } else 1708 vap->iv_stats.is_rx_mgtdiscard++; 1709 break; 1710 1711 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1712 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1713 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1714 vap->iv_stats.is_rx_mgtdiscard++; 1715 return; 1716 default: 1717 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1718 wh, "mgt", "subtype 0x%x not handled", subtype); 1719 vap->iv_stats.is_rx_badsubtype++; 1720 break; 1721 } 1722 #undef ISREASSOC 1723 #undef ISPROBE 1724 } 1725 1726 static void 1727 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1728 { 1729 } 1730