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 #ifdef IEEE80211_DEBUG 209 char ethstr[ETHER_ADDRSTRLEN + 1]; 210 #endif 211 ostate = vap->iv_state; 212 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 213 __func__, ieee80211_state_name[ostate], 214 ieee80211_state_name[nstate], arg); 215 vap->iv_state = nstate; /* state transition */ 216 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 217 if (ostate != IEEE80211_S_SCAN) 218 ieee80211_cancel_scan(vap); /* background scan */ 219 ni = vap->iv_bss; /* NB: no reference held */ 220 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 221 callout_stop(&vap->iv_swbmiss); 222 switch (nstate) { 223 case IEEE80211_S_INIT: 224 switch (ostate) { 225 case IEEE80211_S_SLEEP: 226 /* XXX wakeup */ 227 case IEEE80211_S_RUN: 228 IEEE80211_SEND_MGMT(ni, 229 IEEE80211_FC0_SUBTYPE_DISASSOC, 230 IEEE80211_REASON_ASSOC_LEAVE); 231 ieee80211_sta_leave(ni); 232 break; 233 case IEEE80211_S_ASSOC: 234 IEEE80211_SEND_MGMT(ni, 235 IEEE80211_FC0_SUBTYPE_DEAUTH, 236 IEEE80211_REASON_AUTH_LEAVE); 237 break; 238 case IEEE80211_S_SCAN: 239 ieee80211_cancel_scan(vap); 240 break; 241 default: 242 goto invalid; 243 } 244 if (ostate != IEEE80211_S_INIT) { 245 /* NB: optimize INIT -> INIT case */ 246 ieee80211_reset_bss(vap); 247 } 248 if (vap->iv_auth->ia_detach != NULL) 249 vap->iv_auth->ia_detach(vap); 250 break; 251 case IEEE80211_S_SCAN: 252 switch (ostate) { 253 case IEEE80211_S_INIT: 254 /* 255 * Initiate a scan. We can come here as a result 256 * of an IEEE80211_IOC_SCAN_REQ too in which case 257 * the vap will be marked with IEEE80211_FEXT_SCANREQ 258 * and the scan request parameters will be present 259 * in iv_scanreq. Otherwise we do the default. 260 */ 261 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 262 ieee80211_check_scan(vap, 263 vap->iv_scanreq_flags, 264 vap->iv_scanreq_duration, 265 vap->iv_scanreq_mindwell, 266 vap->iv_scanreq_maxdwell, 267 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 268 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 269 } else 270 ieee80211_check_scan_current(vap); 271 break; 272 case IEEE80211_S_SCAN: 273 case IEEE80211_S_AUTH: 274 case IEEE80211_S_ASSOC: 275 /* 276 * These can happen either because of a timeout 277 * on an assoc/auth response or because of a 278 * change in state that requires a reset. For 279 * the former we're called with a non-zero arg 280 * that is the cause for the failure; pass this 281 * to the scan code so it can update state. 282 * Otherwise trigger a new scan unless we're in 283 * manual roaming mode in which case an application 284 * must issue an explicit scan request. 285 */ 286 if (arg != 0) 287 ieee80211_scan_assoc_fail(vap, 288 vap->iv_bss->ni_macaddr, arg); 289 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 290 ieee80211_check_scan_current(vap); 291 break; 292 case IEEE80211_S_RUN: /* beacon miss */ 293 /* 294 * Beacon miss. Notify user space and if not 295 * under control of a user application (roaming 296 * manual) kick off a scan to re-connect. 297 */ 298 ieee80211_sta_leave(ni); 299 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 300 ieee80211_check_scan_current(vap); 301 break; 302 default: 303 goto invalid; 304 } 305 break; 306 case IEEE80211_S_AUTH: 307 switch (ostate) { 308 case IEEE80211_S_INIT: 309 case IEEE80211_S_SCAN: 310 IEEE80211_SEND_MGMT(ni, 311 IEEE80211_FC0_SUBTYPE_AUTH, 1); 312 break; 313 case IEEE80211_S_AUTH: 314 case IEEE80211_S_ASSOC: 315 switch (arg & 0xff) { 316 case IEEE80211_FC0_SUBTYPE_AUTH: 317 /* ??? */ 318 IEEE80211_SEND_MGMT(ni, 319 IEEE80211_FC0_SUBTYPE_AUTH, 2); 320 break; 321 case IEEE80211_FC0_SUBTYPE_DEAUTH: 322 sta_authretry(vap, ni, arg>>8); 323 break; 324 } 325 break; 326 case IEEE80211_S_RUN: 327 switch (arg & 0xff) { 328 case IEEE80211_FC0_SUBTYPE_AUTH: 329 IEEE80211_SEND_MGMT(ni, 330 IEEE80211_FC0_SUBTYPE_AUTH, 2); 331 vap->iv_state = ostate; /* stay RUN */ 332 break; 333 case IEEE80211_FC0_SUBTYPE_DEAUTH: 334 ieee80211_sta_leave(ni); 335 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 336 /* try to reauth */ 337 IEEE80211_SEND_MGMT(ni, 338 IEEE80211_FC0_SUBTYPE_AUTH, 1); 339 } 340 break; 341 } 342 break; 343 default: 344 goto invalid; 345 } 346 break; 347 case IEEE80211_S_ASSOC: 348 switch (ostate) { 349 case IEEE80211_S_AUTH: 350 case IEEE80211_S_ASSOC: 351 IEEE80211_SEND_MGMT(ni, 352 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 353 break; 354 case IEEE80211_S_SLEEP: /* cannot happen */ 355 case IEEE80211_S_RUN: 356 ieee80211_sta_leave(ni); 357 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 358 IEEE80211_SEND_MGMT(ni, arg ? 359 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 360 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 361 } 362 break; 363 default: 364 goto invalid; 365 } 366 break; 367 case IEEE80211_S_RUN: 368 if (vap->iv_flags & IEEE80211_F_WPA) { 369 /* XXX validate prerequisites */ 370 } 371 switch (ostate) { 372 case IEEE80211_S_RUN: 373 case IEEE80211_S_CSA: 374 break; 375 case IEEE80211_S_AUTH: /* when join is done in fw */ 376 case IEEE80211_S_ASSOC: 377 #ifdef IEEE80211_DEBUG 378 if (ieee80211_msg_debug(vap)) { 379 ieee80211_note(vap, "%s with %s ssid ", 380 (vap->iv_opmode == IEEE80211_M_STA ? 381 "associated" : "synchronized"), 382 kether_ntoa(ni->ni_bssid, ethstr)); 383 ieee80211_print_essid(vap->iv_bss->ni_essid, 384 ni->ni_esslen); 385 /* XXX MCS/HT */ 386 kprintf(" channel %d start %uMb\n", 387 ieee80211_chan2ieee(ic, ic->ic_curchan), 388 IEEE80211_RATE2MBS(ni->ni_txrate)); 389 } 390 #endif 391 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 392 ieee80211_notify_node_join(ni, 393 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 394 break; 395 case IEEE80211_S_SLEEP: 396 ieee80211_sta_pwrsave(vap, 0); 397 break; 398 default: 399 goto invalid; 400 } 401 ieee80211_sync_curchan(ic); 402 if (ostate != IEEE80211_S_RUN && 403 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 404 /* 405 * Start s/w beacon miss timer for devices w/o 406 * hardware support. We fudge a bit here since 407 * we're doing this in software. 408 */ 409 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 410 2 * vap->iv_bmissthreshold * ni->ni_intval); 411 vap->iv_swbmiss_count = 0; 412 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 413 ieee80211_swbmiss_callout, vap); 414 } 415 /* 416 * When 802.1x is not in use mark the port authorized 417 * at this point so traffic can flow. 418 */ 419 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 420 ieee80211_node_authorize(ni); 421 /* 422 * Fake association when joining an existing bss. 423 */ 424 if (ic->ic_newassoc != NULL) 425 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 426 break; 427 case IEEE80211_S_CSA: 428 if (ostate != IEEE80211_S_RUN) 429 goto invalid; 430 break; 431 case IEEE80211_S_SLEEP: 432 ieee80211_sta_pwrsave(vap, 1); 433 break; 434 default: 435 invalid: 436 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 437 "%s: unexpected state transition %s -> %s\n", __func__, 438 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 439 break; 440 } 441 return 0; 442 } 443 444 /* 445 * Return non-zero if the frame is an echo of a multicast 446 * frame sent by ourself. The dir is known to be DSTODS. 447 */ 448 static __inline int 449 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 450 { 451 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 452 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 453 const uint8_t *sa; 454 455 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 456 457 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 458 return 0; 459 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 460 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 461 #undef WH4 462 #undef QWH4 463 } 464 465 /* 466 * Return non-zero if the frame is an echo of a multicast 467 * frame sent by ourself. The dir is known to be FROMDS. 468 */ 469 static __inline int 470 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 471 { 472 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 473 474 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 475 return 0; 476 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 477 } 478 479 /* 480 * Decide if a received management frame should be 481 * printed when debugging is enabled. This filters some 482 * of the less interesting frames that come frequently 483 * (e.g. beacons). 484 */ 485 static __inline int 486 doprint(struct ieee80211vap *vap, int subtype) 487 { 488 switch (subtype) { 489 case IEEE80211_FC0_SUBTYPE_BEACON: 490 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 491 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 492 return 0; 493 } 494 return 1; 495 } 496 497 /* 498 * Process a received frame. The node associated with the sender 499 * should be supplied. If nothing was found in the node table then 500 * the caller is assumed to supply a reference to iv_bss instead. 501 * The RSSI and a timestamp are also supplied. The RSSI data is used 502 * during AP scanning to select a AP to associate with; it can have 503 * any units so long as values have consistent units and higher values 504 * mean ``better signal''. The receive timestamp is currently not used 505 * by the 802.11 layer. 506 */ 507 static int 508 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 509 { 510 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 511 #define HAS_SEQ(type) ((type & 0x4) == 0) 512 struct ieee80211vap *vap = ni->ni_vap; 513 struct ieee80211com *ic = ni->ni_ic; 514 struct ifnet *ifp = vap->iv_ifp; 515 struct ieee80211_frame *wh; 516 struct ieee80211_key *key; 517 struct ether_header *eh; 518 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 519 uint8_t dir, type, subtype, qos; 520 uint8_t *bssid; 521 uint16_t rxseq; 522 #ifdef IEEE80211_DEBUG 523 char ethstr[ETHER_ADDRSTRLEN + 1]; 524 #endif 525 526 if (m->m_flags & M_AMPDU_MPDU) { 527 /* 528 * Fastpath for A-MPDU reorder q resubmission. Frames 529 * w/ M_AMPDU_MPDU marked have already passed through 530 * here but were received out of order and been held on 531 * the reorder queue. When resubmitted they are marked 532 * with the M_AMPDU_MPDU flag and we can bypass most of 533 * the normal processing. 534 */ 535 wh = mtod(m, struct ieee80211_frame *); 536 type = IEEE80211_FC0_TYPE_DATA; 537 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 538 subtype = IEEE80211_FC0_SUBTYPE_QOS; 539 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 540 goto resubmit_ampdu; 541 } 542 543 KASSERT(ni != NULL, ("null node")); 544 ni->ni_inact = ni->ni_inact_reload; 545 546 type = -1; /* undefined */ 547 548 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 549 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 550 ni->ni_macaddr, NULL, 551 "too short (1): len %u", m->m_pkthdr.len); 552 vap->iv_stats.is_rx_tooshort++; 553 goto out; 554 } 555 /* 556 * Bit of a cheat here, we use a pointer for a 3-address 557 * frame format but don't reference fields past outside 558 * ieee80211_frame_min w/o first validating the data is 559 * present. 560 */ 561 wh = mtod(m, struct ieee80211_frame *); 562 563 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 564 IEEE80211_FC0_VERSION_0) { 565 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 566 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 567 wh->i_fc[0], wh->i_fc[1]); 568 vap->iv_stats.is_rx_badversion++; 569 goto err; 570 } 571 572 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 573 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 574 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 575 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 576 bssid = wh->i_addr2; 577 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 578 /* not interested in */ 579 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 580 bssid, NULL, "%s", "not to bss"); 581 vap->iv_stats.is_rx_wrongbss++; 582 goto out; 583 } 584 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 585 ni->ni_noise = nf; 586 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 587 uint8_t tid = ieee80211_gettid(wh); 588 if (IEEE80211_QOS_HAS_SEQ(wh) && 589 TID_TO_WME_AC(tid) >= WME_AC_VI) 590 ic->ic_wme.wme_hipri_traffic++; 591 rxseq = le16toh(*(uint16_t *)wh->i_seq); 592 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 593 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 594 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 595 /* duplicate, discard */ 596 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 597 bssid, "duplicate", 598 "seqno <%u,%u> fragno <%u,%u> tid %u", 599 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 600 ni->ni_rxseqs[tid] >> 601 IEEE80211_SEQ_SEQ_SHIFT, 602 rxseq & IEEE80211_SEQ_FRAG_MASK, 603 ni->ni_rxseqs[tid] & 604 IEEE80211_SEQ_FRAG_MASK, 605 tid); 606 vap->iv_stats.is_rx_dup++; 607 IEEE80211_NODE_STAT(ni, rx_dup); 608 goto out; 609 } 610 ni->ni_rxseqs[tid] = rxseq; 611 } 612 } 613 614 switch (type) { 615 case IEEE80211_FC0_TYPE_DATA: 616 hdrspace = ieee80211_hdrspace(ic, wh); 617 if (m->m_len < hdrspace && 618 (m = m_pullup(m, hdrspace)) == NULL) { 619 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 620 ni->ni_macaddr, NULL, 621 "data too short: expecting %u", hdrspace); 622 vap->iv_stats.is_rx_tooshort++; 623 goto out; /* XXX */ 624 } 625 /* 626 * Handle A-MPDU re-ordering. If the frame is to be 627 * processed directly then ieee80211_ampdu_reorder 628 * will return 0; otherwise it has consumed the mbuf 629 * and we should do nothing more with it. 630 */ 631 if ((m->m_flags & M_AMPDU) && 632 (dir == IEEE80211_FC1_DIR_FROMDS || 633 dir == IEEE80211_FC1_DIR_DSTODS) && 634 ieee80211_ampdu_reorder(ni, m) != 0) { 635 m = NULL; 636 goto out; 637 } 638 resubmit_ampdu: 639 if (dir == IEEE80211_FC1_DIR_FROMDS) { 640 if ((ifp->if_flags & IFF_SIMPLEX) && 641 isfromds_mcastecho(vap, wh)) { 642 /* 643 * In IEEE802.11 network, multicast 644 * packets sent from "me" are broadcast 645 * from the AP; silently discard for 646 * SIMPLEX interface. 647 */ 648 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 649 wh, "data", "%s", "multicast echo"); 650 vap->iv_stats.is_rx_mcastecho++; 651 goto out; 652 } 653 if ((vap->iv_flags & IEEE80211_F_DWDS) && 654 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 655 /* 656 * DWDS sta's must drop 3-address mcast frames 657 * as they will be sent separately as a 4-addr 658 * frame. Accepting the 3-addr frame will 659 * confuse the bridge into thinking the sending 660 * sta is located at the end of WDS link. 661 */ 662 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 663 "3-address data", "%s", "DWDS enabled"); 664 vap->iv_stats.is_rx_mcastecho++; 665 goto out; 666 } 667 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 668 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 669 IEEE80211_DISCARD(vap, 670 IEEE80211_MSG_INPUT, wh, "4-address data", 671 "%s", "DWDS not enabled"); 672 vap->iv_stats.is_rx_wrongdir++; 673 goto out; 674 } 675 if ((ifp->if_flags & IFF_SIMPLEX) && 676 isdstods_mcastecho(vap, wh)) { 677 /* 678 * In IEEE802.11 network, multicast 679 * packets sent from "me" are broadcast 680 * from the AP; silently discard for 681 * SIMPLEX interface. 682 */ 683 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 684 "4-address data", "%s", "multicast echo"); 685 vap->iv_stats.is_rx_mcastecho++; 686 goto out; 687 } 688 } else { 689 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 690 "data", "incorrect dir 0x%x", dir); 691 vap->iv_stats.is_rx_wrongdir++; 692 goto out; 693 } 694 695 /* 696 * Handle privacy requirements. Note that we 697 * must not be preempted from here until after 698 * we (potentially) call ieee80211_crypto_demic; 699 * otherwise we may violate assumptions in the 700 * crypto cipher modules used to do delayed update 701 * of replay sequence numbers. 702 */ 703 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 704 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 705 /* 706 * Discard encrypted frames when privacy is off. 707 */ 708 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 709 wh, "WEP", "%s", "PRIVACY off"); 710 vap->iv_stats.is_rx_noprivacy++; 711 IEEE80211_NODE_STAT(ni, rx_noprivacy); 712 goto out; 713 } 714 key = ieee80211_crypto_decap(ni, m, hdrspace); 715 if (key == NULL) { 716 /* NB: stats+msgs handled in crypto_decap */ 717 IEEE80211_NODE_STAT(ni, rx_wepfail); 718 goto out; 719 } 720 wh = mtod(m, struct ieee80211_frame *); 721 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 722 } else { 723 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 724 key = NULL; 725 } 726 727 /* 728 * Save QoS bits for use below--before we strip the header. 729 */ 730 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 731 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 732 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 733 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 734 } else 735 qos = 0; 736 737 /* 738 * Next up, any fragmentation. 739 */ 740 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 741 m = ieee80211_defrag(ni, m, hdrspace); 742 if (m == NULL) { 743 /* Fragment dropped or frame not complete yet */ 744 goto out; 745 } 746 } 747 wh = NULL; /* no longer valid, catch any uses */ 748 749 /* 750 * Next strip any MSDU crypto bits. 751 */ 752 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 753 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 754 ni->ni_macaddr, "data", "%s", "demic error"); 755 vap->iv_stats.is_rx_demicfail++; 756 IEEE80211_NODE_STAT(ni, rx_demicfail); 757 goto out; 758 } 759 760 /* copy to listener after decrypt */ 761 if (ieee80211_radiotap_active_vap(vap)) 762 ieee80211_radiotap_rx(vap, m); 763 need_tap = 0; 764 765 /* 766 * Finally, strip the 802.11 header. 767 */ 768 m = ieee80211_decap(vap, m, hdrspace); 769 if (m == NULL) { 770 /* XXX mask bit to check for both */ 771 /* don't count Null data frames as errors */ 772 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 773 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 774 goto out; 775 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 776 ni->ni_macaddr, "data", "%s", "decap error"); 777 vap->iv_stats.is_rx_decap++; 778 IEEE80211_NODE_STAT(ni, rx_decap); 779 goto err; 780 } 781 eh = mtod(m, struct ether_header *); 782 if (!ieee80211_node_is_authorized(ni)) { 783 /* 784 * Deny any non-PAE frames received prior to 785 * authorization. For open/shared-key 786 * authentication the port is mark authorized 787 * after authentication completes. For 802.1x 788 * the port is not marked authorized by the 789 * authenticator until the handshake has completed. 790 */ 791 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 792 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 793 eh->ether_shost, "data", 794 "unauthorized port: ether type 0x%x len %u", 795 eh->ether_type, m->m_pkthdr.len); 796 vap->iv_stats.is_rx_unauth++; 797 IEEE80211_NODE_STAT(ni, rx_unauth); 798 goto err; 799 } 800 } else { 801 /* 802 * When denying unencrypted frames, discard 803 * any non-PAE frames received without encryption. 804 */ 805 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 806 (key == NULL && (m->m_flags & M_WEP) == 0) && 807 eh->ether_type != htons(ETHERTYPE_PAE)) { 808 /* 809 * Drop unencrypted frames. 810 */ 811 vap->iv_stats.is_rx_unencrypted++; 812 IEEE80211_NODE_STAT(ni, rx_unencrypted); 813 goto out; 814 } 815 } 816 /* XXX require HT? */ 817 if (qos & IEEE80211_QOS_AMSDU) { 818 m = ieee80211_decap_amsdu(ni, m); 819 if (m == NULL) 820 return IEEE80211_FC0_TYPE_DATA; 821 } else { 822 #ifdef IEEE80211_SUPPORT_SUPERG 823 m = ieee80211_decap_fastframe(vap, ni, m); 824 if (m == NULL) 825 return IEEE80211_FC0_TYPE_DATA; 826 #endif 827 } 828 ieee80211_deliver_data(vap, ni, m); 829 return IEEE80211_FC0_TYPE_DATA; 830 831 case IEEE80211_FC0_TYPE_MGT: 832 vap->iv_stats.is_rx_mgmt++; 833 IEEE80211_NODE_STAT(ni, rx_mgmt); 834 if (dir != IEEE80211_FC1_DIR_NODS) { 835 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 836 wh, "data", "incorrect dir 0x%x", dir); 837 vap->iv_stats.is_rx_wrongdir++; 838 goto err; 839 } 840 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 841 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 842 ni->ni_macaddr, "mgt", "too short: len %u", 843 m->m_pkthdr.len); 844 vap->iv_stats.is_rx_tooshort++; 845 goto out; 846 } 847 #ifdef IEEE80211_DEBUG 848 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 849 ieee80211_msg_dumppkts(vap)) { 850 if_printf(ifp, "received %s from %s rssi %d\n", 851 ieee80211_mgt_subtype_name[subtype >> 852 IEEE80211_FC0_SUBTYPE_SHIFT], 853 kether_ntoa(wh->i_addr2, ethstr), rssi); 854 } 855 #endif 856 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 858 /* 859 * Only shared key auth frames with a challenge 860 * should be encrypted, discard all others. 861 */ 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, ieee80211_mgt_subtype_name[subtype >> 864 IEEE80211_FC0_SUBTYPE_SHIFT], 865 "%s", "WEP set but not permitted"); 866 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 867 goto out; 868 } 869 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 870 /* 871 * Discard encrypted frames when privacy is off. 872 */ 873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 874 wh, "mgt", "%s", "WEP set but PRIVACY off"); 875 vap->iv_stats.is_rx_noprivacy++; 876 goto out; 877 } 878 hdrspace = ieee80211_hdrspace(ic, wh); 879 key = ieee80211_crypto_decap(ni, m, hdrspace); 880 if (key == NULL) { 881 /* NB: stats+msgs handled in crypto_decap */ 882 goto out; 883 } 884 wh = mtod(m, struct ieee80211_frame *); 885 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 886 } 887 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 888 goto out; 889 890 case IEEE80211_FC0_TYPE_CTL: 891 vap->iv_stats.is_rx_ctl++; 892 IEEE80211_NODE_STAT(ni, rx_ctrl); 893 vap->iv_recv_ctl(ni, m, subtype); 894 goto out; 895 896 default: 897 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 898 wh, NULL, "bad frame type 0x%x", type); 899 /* should not come here */ 900 break; 901 } 902 err: 903 IFNET_STAT_INC(ifp, ierrors, 1); 904 out: 905 if (m != NULL) { 906 if (need_tap && ieee80211_radiotap_active_vap(vap)) 907 ieee80211_radiotap_rx(vap, m); 908 m_freem(m); 909 } 910 return type; 911 #undef SEQ_LEQ 912 } 913 914 static void 915 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 916 int rssi, int nf, uint16_t seq, uint16_t status) 917 { 918 struct ieee80211vap *vap = ni->ni_vap; 919 920 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 921 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 922 ni->ni_macaddr, "open auth", 923 "bad sta auth mode %u", ni->ni_authmode); 924 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 925 return; 926 } 927 if (vap->iv_state != IEEE80211_S_AUTH || 928 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 929 vap->iv_stats.is_rx_bad_auth++; 930 return; 931 } 932 if (status != 0) { 933 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 934 ni, "open auth failed (reason %d)", status); 935 vap->iv_stats.is_rx_auth_fail++; 936 vap->iv_stats.is_rx_authfail_code = status; 937 ieee80211_new_state(vap, IEEE80211_S_SCAN, 938 IEEE80211_SCAN_FAIL_STATUS); 939 } else 940 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 941 } 942 943 static void 944 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 945 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 946 uint16_t seq, uint16_t status) 947 { 948 struct ieee80211vap *vap = ni->ni_vap; 949 uint8_t *challenge; 950 951 /* 952 * NB: this can happen as we allow pre-shared key 953 * authentication to be enabled w/o wep being turned 954 * on so that configuration of these can be done 955 * in any order. It may be better to enforce the 956 * ordering in which case this check would just be 957 * for sanity/consistency. 958 */ 959 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 960 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 961 ni->ni_macaddr, "shared key auth", 962 "%s", " PRIVACY is disabled"); 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 goto bad; 977 } 978 979 challenge = NULL; 980 if (frm + 1 < efrm) { 981 if ((frm[1] + 2) > (efrm - frm)) { 982 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 983 ni->ni_macaddr, "shared key auth", 984 "ie %d/%d too long", 985 frm[0], (int)((frm[1] + 2) - (efrm - frm))); 986 vap->iv_stats.is_rx_bad_auth++; 987 goto bad; 988 } 989 if (*frm == IEEE80211_ELEMID_CHALLENGE) 990 challenge = frm; 991 frm += frm[1] + 2; 992 } 993 switch (seq) { 994 case IEEE80211_AUTH_SHARED_CHALLENGE: 995 case IEEE80211_AUTH_SHARED_RESPONSE: 996 if (challenge == NULL) { 997 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 998 ni->ni_macaddr, "shared key auth", 999 "%s", "no challenge"); 1000 vap->iv_stats.is_rx_bad_auth++; 1001 goto bad; 1002 } 1003 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1004 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1005 ni->ni_macaddr, "shared key auth", 1006 "bad challenge len %d", challenge[1]); 1007 vap->iv_stats.is_rx_bad_auth++; 1008 goto bad; 1009 } 1010 default: 1011 break; 1012 } 1013 if (vap->iv_state != IEEE80211_S_AUTH) 1014 return; 1015 switch (seq) { 1016 case IEEE80211_AUTH_SHARED_PASS: 1017 if (ni->ni_challenge != NULL) { 1018 kfree(ni->ni_challenge, M_80211_NODE); 1019 ni->ni_challenge = NULL; 1020 } 1021 if (status != 0) { 1022 IEEE80211_NOTE_FRAME(vap, 1023 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1024 "shared key auth failed (reason %d)", status); 1025 vap->iv_stats.is_rx_auth_fail++; 1026 vap->iv_stats.is_rx_authfail_code = status; 1027 return; 1028 } 1029 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1030 break; 1031 case IEEE80211_AUTH_SHARED_CHALLENGE: 1032 if (!ieee80211_alloc_challenge(ni)) 1033 return; 1034 /* XXX could optimize by passing recvd challenge */ 1035 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1036 IEEE80211_SEND_MGMT(ni, 1037 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1038 break; 1039 default: 1040 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1041 wh, "shared key auth", "bad seq %d", seq); 1042 vap->iv_stats.is_rx_bad_auth++; 1043 return; 1044 } 1045 return; 1046 bad: 1047 /* 1048 * Kick the state machine. This short-circuits 1049 * using the mgt frame timeout to trigger the 1050 * state transition. 1051 */ 1052 if (vap->iv_state == IEEE80211_S_AUTH) 1053 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1054 IEEE80211_SCAN_FAIL_STATUS); 1055 } 1056 1057 static int 1058 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1059 const struct ieee80211_frame *wh) 1060 { 1061 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1062 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1063 u_int len = frm[1], qosinfo; 1064 int i; 1065 1066 if (len < sizeof(struct ieee80211_wme_param)-2) { 1067 IEEE80211_DISCARD_IE(vap, 1068 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1069 wh, "WME", "too short, len %u", len); 1070 return -1; 1071 } 1072 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1073 qosinfo &= WME_QOSINFO_COUNT; 1074 /* XXX do proper check for wraparound */ 1075 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1076 return 0; 1077 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1078 for (i = 0; i < WME_NUM_AC; i++) { 1079 struct wmeParams *wmep = 1080 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1081 /* NB: ACI not used */ 1082 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1083 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1084 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1085 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1086 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1087 frm += 4; 1088 } 1089 wme->wme_wmeChanParams.cap_info = qosinfo; 1090 return 1; 1091 #undef MS 1092 } 1093 1094 /* 1095 * Process 11h Channel Switch Announcement (CSA) ie. If this 1096 * is the first CSA then initiate the switch. Otherwise we 1097 * track state and trigger completion and/or cancel of the switch. 1098 * XXX should be public for IBSS use 1099 */ 1100 static void 1101 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1102 const struct ieee80211_frame *wh) 1103 { 1104 struct ieee80211com *ic = vap->iv_ic; 1105 const struct ieee80211_csa_ie *csa = 1106 (const struct ieee80211_csa_ie *) frm; 1107 1108 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1109 ("state %s", ieee80211_state_name[vap->iv_state])); 1110 1111 if (csa->csa_mode > 1) { 1112 IEEE80211_DISCARD_IE(vap, 1113 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1114 wh, "CSA", "invalid mode %u", csa->csa_mode); 1115 return; 1116 } 1117 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1118 /* 1119 * Convert the channel number to a channel reference. We 1120 * try first to preserve turbo attribute of the current 1121 * channel then fallback. Note this will not work if the 1122 * CSA specifies a channel that requires a band switch (e.g. 1123 * 11a => 11g). This is intentional as 11h is defined only 1124 * for 5GHz/11a and because the switch does not involve a 1125 * reassociation, protocol state (capabilities, negotated 1126 * rates, etc) may/will be wrong. 1127 */ 1128 struct ieee80211_channel *c = 1129 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1130 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1131 if (c == NULL) { 1132 c = ieee80211_find_channel_byieee(ic, 1133 csa->csa_newchan, 1134 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1135 if (c == NULL) { 1136 IEEE80211_DISCARD_IE(vap, 1137 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1138 wh, "CSA", "invalid channel %u", 1139 csa->csa_newchan); 1140 goto done; 1141 } 1142 } 1143 #if IEEE80211_CSA_COUNT_MIN > 0 1144 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1145 /* 1146 * Require at least IEEE80211_CSA_COUNT_MIN count to 1147 * reduce the risk of being redirected by a fabricated 1148 * CSA. If a valid CSA is dropped we'll still get a 1149 * beacon miss when the AP leaves the channel so we'll 1150 * eventually follow to the new channel. 1151 * 1152 * NOTE: this violates the 11h spec that states that 1153 * count may be any value and if 0 then a switch 1154 * should happen asap. 1155 */ 1156 IEEE80211_DISCARD_IE(vap, 1157 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1158 wh, "CSA", "count %u too small, must be >= %u", 1159 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1160 goto done; 1161 } 1162 #endif 1163 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1164 } else { 1165 /* 1166 * Validate this ie against the initial CSA. We require 1167 * mode and channel not change and the count must be 1168 * monotonically decreasing. This may be pointless and 1169 * canceling the switch as a result may be too paranoid but 1170 * in the worst case if we drop out of CSA because of this 1171 * and the AP does move then we'll just end up taking a 1172 * beacon miss and scan to find the AP. 1173 * 1174 * XXX may want <= on count as we also process ProbeResp 1175 * frames and those may come in w/ the same count as the 1176 * previous beacon; but doing so leaves us open to a stuck 1177 * count until we add a dead-man timer 1178 */ 1179 if (!(csa->csa_count < ic->ic_csa_count && 1180 csa->csa_mode == ic->ic_csa_mode && 1181 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1182 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1183 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1184 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1185 ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count, 1186 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1187 ieee80211_csa_cancelswitch(ic); 1188 } else { 1189 if (csa->csa_count <= 1) 1190 ieee80211_csa_completeswitch(ic); 1191 else 1192 ic->ic_csa_count = csa->csa_count; 1193 } 1194 } 1195 done: 1196 ; 1197 } 1198 1199 /* 1200 * Return non-zero if a background scan may be continued: 1201 * o bg scan is active 1202 * o no channel switch is pending 1203 * o there has not been any traffic recently 1204 * 1205 * Note we do not check if there is an administrative enable; 1206 * this is only done to start the scan. We assume that any 1207 * change in state will be accompanied by a request to cancel 1208 * active scans which will otherwise cause this test to fail. 1209 */ 1210 static __inline int 1211 contbgscan(struct ieee80211vap *vap) 1212 { 1213 struct ieee80211com *ic = vap->iv_ic; 1214 1215 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1216 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1217 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1218 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1219 } 1220 1221 /* 1222 * Return non-zero if a backgrond scan may be started: 1223 * o bg scanning is administratively enabled 1224 * o no channel switch is pending 1225 * o we are not boosted on a dynamic turbo channel 1226 * o there has not been a scan recently 1227 * o there has not been any traffic recently 1228 */ 1229 static __inline int 1230 startbgscan(struct ieee80211vap *vap) 1231 { 1232 struct ieee80211com *ic = vap->iv_ic; 1233 1234 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1235 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1236 #ifdef IEEE80211_SUPPORT_SUPERG 1237 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1238 #endif 1239 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1240 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1241 } 1242 1243 static void 1244 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1245 int subtype, int rssi, int nf) 1246 { 1247 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1248 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1249 struct ieee80211vap *vap = ni->ni_vap; 1250 struct ieee80211com *ic = ni->ni_ic; 1251 struct ieee80211_frame *wh; 1252 uint8_t *frm, *efrm; 1253 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1254 uint8_t rate; 1255 1256 wh = mtod(m0, struct ieee80211_frame *); 1257 frm = (uint8_t *)&wh[1]; 1258 efrm = mtod(m0, uint8_t *) + m0->m_len; 1259 switch (subtype) { 1260 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1261 case IEEE80211_FC0_SUBTYPE_BEACON: { 1262 struct ieee80211_scanparams scan; 1263 /* 1264 * We process beacon/probe response frames: 1265 * o when scanning, or 1266 * o station mode when associated (to collect state 1267 * updates such as 802.11g slot time) 1268 * Frames otherwise received are discarded. 1269 */ 1270 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1271 vap->iv_stats.is_rx_mgtdiscard++; 1272 return; 1273 } 1274 /* XXX probe response in sta mode when !scanning? */ 1275 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1276 return; 1277 /* 1278 * Count frame now that we know it's to be processed. 1279 */ 1280 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1281 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1282 IEEE80211_NODE_STAT(ni, rx_beacons); 1283 } else 1284 IEEE80211_NODE_STAT(ni, rx_proberesp); 1285 /* 1286 * When operating in station mode, check for state updates. 1287 * Be careful to ignore beacons received while doing a 1288 * background scan. We consider only 11g/WMM stuff right now. 1289 */ 1290 if (ni->ni_associd != 0 && 1291 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1292 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1293 /* record tsf of last beacon */ 1294 memcpy(ni->ni_tstamp.data, scan.tstamp, 1295 sizeof(ni->ni_tstamp)); 1296 /* count beacon frame for s/w bmiss handling */ 1297 vap->iv_swbmiss_count++; 1298 vap->iv_bmiss_count = 0; 1299 if (ni->ni_erp != scan.erp) { 1300 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1301 wh->i_addr2, 1302 "erp change: was 0x%x, now 0x%x", 1303 ni->ni_erp, scan.erp); 1304 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1305 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1306 ic->ic_flags |= IEEE80211_F_USEPROT; 1307 else 1308 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1309 ni->ni_erp = scan.erp; 1310 /* XXX statistic */ 1311 /* XXX driver notification */ 1312 } 1313 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1314 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1315 wh->i_addr2, 1316 "capabilities change: was 0x%x, now 0x%x", 1317 ni->ni_capinfo, scan.capinfo); 1318 /* 1319 * NB: we assume short preamble doesn't 1320 * change dynamically 1321 */ 1322 ieee80211_set_shortslottime(ic, 1323 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1324 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1325 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1326 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1327 /* XXX statistic */ 1328 } 1329 if (scan.wme != NULL && 1330 (ni->ni_flags & IEEE80211_NODE_QOS) && 1331 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1332 ieee80211_wme_updateparams(vap); 1333 #ifdef IEEE80211_SUPPORT_SUPERG 1334 if (scan.ath != NULL) 1335 ieee80211_parse_athparams(ni, scan.ath, wh); 1336 #endif 1337 if (scan.htcap != NULL && scan.htinfo != NULL && 1338 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1339 ieee80211_ht_updateparams(ni, 1340 scan.htcap, scan.htinfo); 1341 /* XXX state changes? */ 1342 } 1343 if (scan.tim != NULL) { 1344 struct ieee80211_tim_ie *tim = 1345 (struct ieee80211_tim_ie *) scan.tim; 1346 #if 0 1347 int aid = IEEE80211_AID(ni->ni_associd); 1348 int ix = aid / NBBY; 1349 int min = tim->tim_bitctl &~ 1; 1350 int max = tim->tim_len + min - 4; 1351 if ((tim->tim_bitctl&1) || 1352 (min <= ix && ix <= max && 1353 isset(tim->tim_bitmap - min, aid))) { 1354 /* 1355 * XXX Do not let bg scan kick off 1356 * we are expecting data. 1357 */ 1358 ic->ic_lastdata = ticks; 1359 ieee80211_sta_pwrsave(vap, 0); 1360 } 1361 #endif 1362 ni->ni_dtim_count = tim->tim_count; 1363 ni->ni_dtim_period = tim->tim_period; 1364 } 1365 if (scan.csa != NULL && 1366 (vap->iv_flags & IEEE80211_F_DOTH)) 1367 ieee80211_parse_csaparams(vap, scan.csa, wh); 1368 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1369 /* 1370 * No CSA ie or 11h disabled, but a channel 1371 * switch is pending; drop out so we aren't 1372 * stuck in CSA state. If the AP really is 1373 * moving we'll get a beacon miss and scan. 1374 */ 1375 ieee80211_csa_cancelswitch(ic); 1376 } 1377 /* 1378 * If scanning, pass the info to the scan module. 1379 * Otherwise, check if it's the right time to do 1380 * a background scan. Background scanning must 1381 * be enabled and we must not be operating in the 1382 * turbo phase of dynamic turbo mode. Then, 1383 * it's been a while since the last background 1384 * scan and if no data frames have come through 1385 * recently, kick off a scan. Note that this 1386 * is the mechanism by which a background scan 1387 * is started _and_ continued each time we 1388 * return on-channel to receive a beacon from 1389 * our ap. 1390 */ 1391 if (ic->ic_flags & IEEE80211_F_SCAN) { 1392 ieee80211_add_scan(vap, &scan, wh, 1393 subtype, rssi, nf); 1394 } else if (contbgscan(vap)) { 1395 ieee80211_bg_scan(vap, 0); 1396 } else if (startbgscan(vap)) { 1397 vap->iv_stats.is_scan_bg++; 1398 #if 0 1399 /* wakeup if we are sleeing */ 1400 ieee80211_set_pwrsave(vap, 0); 1401 #endif 1402 ieee80211_bg_scan(vap, 0); 1403 } 1404 return; 1405 } 1406 /* 1407 * If scanning, just pass information to the scan module. 1408 */ 1409 if (ic->ic_flags & IEEE80211_F_SCAN) { 1410 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1411 /* 1412 * Actively scanning a channel marked passive; 1413 * send a probe request now that we know there 1414 * is 802.11 traffic present. 1415 * 1416 * XXX check if the beacon we recv'd gives 1417 * us what we need and suppress the probe req 1418 */ 1419 ieee80211_probe_curchan(vap, 1); 1420 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1421 } 1422 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1423 return; 1424 } 1425 break; 1426 } 1427 1428 case IEEE80211_FC0_SUBTYPE_AUTH: { 1429 uint16_t algo, seq, status; 1430 /* 1431 * auth frame format 1432 * [2] algorithm 1433 * [2] sequence 1434 * [2] status 1435 * [tlv*] challenge 1436 */ 1437 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1438 algo = le16toh(*(uint16_t *)frm); 1439 seq = le16toh(*(uint16_t *)(frm + 2)); 1440 status = le16toh(*(uint16_t *)(frm + 4)); 1441 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1442 "recv auth frame with algorithm %d seq %d", algo, seq); 1443 1444 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1445 IEEE80211_DISCARD(vap, 1446 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1447 wh, "auth", "%s", "TKIP countermeasures enabled"); 1448 vap->iv_stats.is_rx_auth_countermeasures++; 1449 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1450 ieee80211_send_error(ni, wh->i_addr2, 1451 IEEE80211_FC0_SUBTYPE_AUTH, 1452 IEEE80211_REASON_MIC_FAILURE); 1453 } 1454 return; 1455 } 1456 if (algo == IEEE80211_AUTH_ALG_SHARED) 1457 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1458 seq, status); 1459 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1460 sta_auth_open(ni, wh, rssi, nf, seq, status); 1461 else { 1462 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1463 wh, "auth", "unsupported alg %d", algo); 1464 vap->iv_stats.is_rx_auth_unsupported++; 1465 return; 1466 } 1467 break; 1468 } 1469 1470 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1471 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1472 uint16_t capinfo, associd; 1473 uint16_t status; 1474 1475 if (vap->iv_state != IEEE80211_S_ASSOC) { 1476 vap->iv_stats.is_rx_mgtdiscard++; 1477 return; 1478 } 1479 1480 /* 1481 * asresp frame format 1482 * [2] capability information 1483 * [2] status 1484 * [2] association ID 1485 * [tlv] supported rates 1486 * [tlv] extended supported rates 1487 * [tlv] WME 1488 * [tlv] HT capabilities 1489 * [tlv] HT info 1490 */ 1491 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1492 ni = vap->iv_bss; 1493 capinfo = le16toh(*(uint16_t *)frm); 1494 frm += 2; 1495 status = le16toh(*(uint16_t *)frm); 1496 frm += 2; 1497 if (status != 0) { 1498 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1499 wh->i_addr2, "%sassoc failed (reason %d)", 1500 ISREASSOC(subtype) ? "re" : "", status); 1501 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1502 return; 1503 } 1504 associd = le16toh(*(uint16_t *)frm); 1505 frm += 2; 1506 1507 rates = xrates = wme = htcap = htinfo = NULL; 1508 while (efrm - frm > 1) { 1509 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1510 switch (*frm) { 1511 case IEEE80211_ELEMID_RATES: 1512 rates = frm; 1513 break; 1514 case IEEE80211_ELEMID_XRATES: 1515 xrates = frm; 1516 break; 1517 case IEEE80211_ELEMID_HTCAP: 1518 htcap = frm; 1519 break; 1520 case IEEE80211_ELEMID_HTINFO: 1521 htinfo = frm; 1522 break; 1523 case IEEE80211_ELEMID_VENDOR: 1524 if (iswmeoui(frm)) 1525 wme = frm; 1526 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1527 /* 1528 * Accept pre-draft HT ie's if the 1529 * standard ones have not been seen. 1530 */ 1531 if (ishtcapoui(frm)) { 1532 if (htcap == NULL) 1533 htcap = frm; 1534 } else if (ishtinfooui(frm)) { 1535 if (htinfo == NULL) 1536 htcap = frm; 1537 } 1538 } 1539 /* XXX Atheros OUI support */ 1540 break; 1541 } 1542 frm += frm[1] + 2; 1543 } 1544 1545 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1546 if (xrates != NULL) 1547 IEEE80211_VERIFY_ELEMENT(xrates, 1548 IEEE80211_RATE_MAXSIZE - rates[1], return); 1549 rate = ieee80211_setup_rates(ni, rates, xrates, 1550 IEEE80211_F_JOIN | 1551 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1552 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1553 if (rate & IEEE80211_RATE_BASIC) { 1554 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1555 wh->i_addr2, 1556 "%sassoc failed (rate set mismatch)", 1557 ISREASSOC(subtype) ? "re" : ""); 1558 vap->iv_stats.is_rx_assoc_norate++; 1559 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1560 IEEE80211_SCAN_FAIL_STATUS); 1561 return; 1562 } 1563 1564 ni->ni_capinfo = capinfo; 1565 ni->ni_associd = associd; 1566 if (ni->ni_jointime == 0) 1567 ni->ni_jointime = time_second; 1568 if (wme != NULL && 1569 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1570 ni->ni_flags |= IEEE80211_NODE_QOS; 1571 ieee80211_wme_updateparams(vap); 1572 } else 1573 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1574 /* 1575 * Setup HT state according to the negotiation. 1576 * 1577 * NB: shouldn't need to check if HT use is enabled but some 1578 * ap's send back HT ie's even when we don't indicate we 1579 * are HT capable in our AssocReq. 1580 */ 1581 if (htcap != NULL && htinfo != NULL && 1582 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1583 ieee80211_ht_node_init(ni); 1584 ieee80211_ht_updateparams(ni, htcap, htinfo); 1585 ieee80211_setup_htrates(ni, htcap, 1586 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1587 ieee80211_setup_basic_htrates(ni, htinfo); 1588 ieee80211_node_setuptxparms(ni); 1589 } else { 1590 #ifdef IEEE80211_SUPPORT_SUPERG 1591 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1592 ieee80211_ff_node_init(ni); 1593 #endif 1594 } 1595 /* 1596 * Configure state now that we are associated. 1597 * 1598 * XXX may need different/additional driver callbacks? 1599 */ 1600 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1601 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1602 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1603 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1604 } else { 1605 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1606 ic->ic_flags |= IEEE80211_F_USEBARKER; 1607 } 1608 ieee80211_set_shortslottime(ic, 1609 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1610 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1611 /* 1612 * Honor ERP protection. 1613 * 1614 * NB: ni_erp should zero for non-11g operation. 1615 */ 1616 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1617 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1618 ic->ic_flags |= IEEE80211_F_USEPROT; 1619 else 1620 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1621 IEEE80211_NOTE_MAC(vap, 1622 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1623 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1624 ISREASSOC(subtype) ? "re" : "", 1625 IEEE80211_NODE_AID(ni), 1626 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1627 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1628 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1629 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1630 ni->ni_flags & IEEE80211_NODE_HT ? 1631 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1632 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1633 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1634 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1635 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1636 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1637 ", fast-frames" : "", 1638 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1639 ", turbo" : "" 1640 ); 1641 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1642 break; 1643 } 1644 1645 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1646 uint16_t reason; 1647 1648 if (vap->iv_state == IEEE80211_S_SCAN) { 1649 vap->iv_stats.is_rx_mgtdiscard++; 1650 return; 1651 } 1652 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1653 /* NB: can happen when in promiscuous mode */ 1654 vap->iv_stats.is_rx_mgtdiscard++; 1655 break; 1656 } 1657 1658 /* 1659 * deauth frame format 1660 * [2] reason 1661 */ 1662 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1663 reason = le16toh(*(uint16_t *)frm); 1664 1665 vap->iv_stats.is_rx_deauth++; 1666 vap->iv_stats.is_rx_deauth_code = reason; 1667 IEEE80211_NODE_STAT(ni, rx_deauth); 1668 1669 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1670 "recv deauthenticate (reason %d)", reason); 1671 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1672 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1673 break; 1674 } 1675 1676 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1677 uint16_t reason; 1678 1679 if (vap->iv_state != IEEE80211_S_RUN && 1680 vap->iv_state != IEEE80211_S_ASSOC && 1681 vap->iv_state != IEEE80211_S_AUTH) { 1682 vap->iv_stats.is_rx_mgtdiscard++; 1683 return; 1684 } 1685 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1686 /* NB: can happen when in promiscuous mode */ 1687 vap->iv_stats.is_rx_mgtdiscard++; 1688 break; 1689 } 1690 1691 /* 1692 * disassoc frame format 1693 * [2] reason 1694 */ 1695 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1696 reason = le16toh(*(uint16_t *)frm); 1697 1698 vap->iv_stats.is_rx_disassoc++; 1699 vap->iv_stats.is_rx_disassoc_code = reason; 1700 IEEE80211_NODE_STAT(ni, rx_disassoc); 1701 1702 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1703 "recv disassociate (reason %d)", reason); 1704 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1705 break; 1706 } 1707 1708 case IEEE80211_FC0_SUBTYPE_ACTION: 1709 if (vap->iv_state == IEEE80211_S_RUN) { 1710 if (ieee80211_parse_action(ni, m0) == 0) 1711 ic->ic_recv_action(ni, wh, frm, efrm); 1712 } else 1713 vap->iv_stats.is_rx_mgtdiscard++; 1714 break; 1715 1716 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1717 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1718 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1719 vap->iv_stats.is_rx_mgtdiscard++; 1720 return; 1721 default: 1722 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1723 wh, "mgt", "subtype 0x%x not handled", subtype); 1724 vap->iv_stats.is_rx_badsubtype++; 1725 break; 1726 } 1727 #undef ISREASSOC 1728 #undef ISPROBE 1729 } 1730 1731 static void 1732 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1733 { 1734 } 1735