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 #include <netproto/802_11/ieee80211_ratectl.h> 59 #ifdef IEEE80211_SUPPORT_SUPERG 60 #include <netproto/802_11/ieee80211_superg.h> 61 #endif 62 63 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 64 65 static void sta_vattach(struct ieee80211vap *); 66 static void sta_beacon_miss(struct ieee80211vap *); 67 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 68 static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 69 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 70 int subtype, int rssi, int nf); 71 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 72 73 void 74 ieee80211_sta_attach(struct ieee80211com *ic) 75 { 76 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 77 } 78 79 void 80 ieee80211_sta_detach(struct ieee80211com *ic) 81 { 82 } 83 84 static void 85 sta_vdetach(struct ieee80211vap *vap) 86 { 87 } 88 89 static void 90 sta_vattach(struct ieee80211vap *vap) 91 { 92 vap->iv_newstate = sta_newstate; 93 vap->iv_input = sta_input; 94 vap->iv_recv_mgmt = sta_recv_mgmt; 95 vap->iv_recv_ctl = sta_recv_ctl; 96 vap->iv_opdetach = sta_vdetach; 97 vap->iv_bmiss = sta_beacon_miss; 98 } 99 100 /* 101 * Handle a beacon miss event. The common code filters out 102 * spurious events that can happen when scanning and/or before 103 * reaching RUN state. 104 */ 105 static void 106 sta_beacon_miss(struct ieee80211vap *vap) 107 { 108 struct ieee80211com *ic = vap->iv_ic; 109 110 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 111 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 112 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 113 114 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 115 "beacon miss, mode %s state %s\n", 116 ieee80211_opmode_name[vap->iv_opmode], 117 ieee80211_state_name[vap->iv_state]); 118 119 if (vap->iv_state == IEEE80211_S_CSA) { 120 /* 121 * A Channel Switch is pending; assume we missed the 122 * beacon that would've completed the process and just 123 * force the switch. If we made a mistake we'll not 124 * find the AP on the new channel and fall back to a 125 * normal scan. 126 */ 127 ieee80211_csa_completeswitch(ic); 128 return; 129 } 130 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 131 /* 132 * Send a directed probe req before falling back to a 133 * scan; if we receive a response ic_bmiss_count will 134 * be reset. Some cards mistakenly report beacon miss 135 * so this avoids the expensive scan if the ap is 136 * still there. 137 */ 138 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 139 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 140 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 141 return; 142 } 143 vap->iv_bmiss_count = 0; 144 vap->iv_stats.is_beacon_miss++; 145 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 146 #ifdef IEEE80211_SUPPORT_SUPERG 147 struct ieee80211com *ic = vap->iv_ic; 148 149 /* 150 * If we receive a beacon miss interrupt when using 151 * dynamic turbo, attempt to switch modes before 152 * reassociating. 153 */ 154 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 155 ieee80211_dturbo_switch(vap, 156 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 157 #endif 158 /* 159 * Try to reassociate before scanning for a new ap. 160 */ 161 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 162 } else { 163 /* 164 * Somebody else is controlling state changes (e.g. 165 * a user-mode app) don't do anything that would 166 * confuse them; just drop into scan mode so they'll 167 * notified of the state change and given control. 168 */ 169 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 170 } 171 } 172 173 /* 174 * Handle deauth with reason. We retry only for 175 * the cases where we might succeed. Otherwise 176 * we downgrade the ap and scan. 177 */ 178 static void 179 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 180 { 181 switch (reason) { 182 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 183 case IEEE80211_STATUS_TIMEOUT: 184 case IEEE80211_REASON_ASSOC_EXPIRE: 185 case IEEE80211_REASON_NOT_AUTHED: 186 case IEEE80211_REASON_NOT_ASSOCED: 187 case IEEE80211_REASON_ASSOC_LEAVE: 188 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 189 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 190 break; 191 default: 192 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 193 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 194 ieee80211_check_scan_current(vap); 195 break; 196 } 197 } 198 199 /* 200 * IEEE80211_M_STA vap state machine handler. 201 * This routine handles the main states in the 802.11 protocol. 202 */ 203 static int 204 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 205 { 206 struct ieee80211com *ic = vap->iv_ic; 207 struct ieee80211_node *ni; 208 enum ieee80211_state ostate; 209 #ifdef IEEE80211_DEBUG 210 char ethstr[ETHER_ADDRSTRLEN + 1]; 211 #endif 212 ostate = vap->iv_state; 213 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 214 __func__, ieee80211_state_name[ostate], 215 ieee80211_state_name[nstate], arg); 216 vap->iv_state = nstate; /* state transition */ 217 callout_stop(&vap->iv_mgtsend); 218 if (ostate != IEEE80211_S_SCAN) 219 ieee80211_cancel_scan(vap); /* background scan */ 220 ni = vap->iv_bss; /* NB: no reference held */ 221 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 222 callout_stop(&vap->iv_swbmiss); 223 switch (nstate) { 224 case IEEE80211_S_INIT: 225 switch (ostate) { 226 case IEEE80211_S_SLEEP: 227 /* XXX wakeup */ 228 case IEEE80211_S_RUN: 229 IEEE80211_SEND_MGMT(ni, 230 IEEE80211_FC0_SUBTYPE_DISASSOC, 231 IEEE80211_REASON_ASSOC_LEAVE); 232 ieee80211_sta_leave(ni); 233 break; 234 case IEEE80211_S_ASSOC: 235 IEEE80211_SEND_MGMT(ni, 236 IEEE80211_FC0_SUBTYPE_DEAUTH, 237 IEEE80211_REASON_AUTH_LEAVE); 238 break; 239 case IEEE80211_S_SCAN: 240 ieee80211_cancel_scan(vap); 241 break; 242 default: 243 goto invalid; 244 } 245 if (ostate != IEEE80211_S_INIT) { 246 /* NB: optimize INIT -> INIT case */ 247 ieee80211_reset_bss(vap); 248 } 249 if (vap->iv_auth->ia_detach != NULL) 250 vap->iv_auth->ia_detach(vap); 251 break; 252 case IEEE80211_S_SCAN: 253 switch (ostate) { 254 case IEEE80211_S_INIT: 255 /* 256 * Initiate a scan. We can come here as a result 257 * of an IEEE80211_IOC_SCAN_REQ too in which case 258 * the vap will be marked with IEEE80211_FEXT_SCANREQ 259 * and the scan request parameters will be present 260 * in iv_scanreq. Otherwise we do the default. 261 */ 262 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 263 ieee80211_check_scan(vap, 264 vap->iv_scanreq_flags, 265 vap->iv_scanreq_duration, 266 vap->iv_scanreq_mindwell, 267 vap->iv_scanreq_maxdwell, 268 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 269 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 270 } else 271 ieee80211_check_scan_current(vap); 272 break; 273 case IEEE80211_S_SCAN: 274 case IEEE80211_S_AUTH: 275 case IEEE80211_S_ASSOC: 276 /* 277 * These can happen either because of a timeout 278 * on an assoc/auth response or because of a 279 * change in state that requires a reset. For 280 * the former we're called with a non-zero arg 281 * that is the cause for the failure; pass this 282 * to the scan code so it can update state. 283 * Otherwise trigger a new scan unless we're in 284 * manual roaming mode in which case an application 285 * must issue an explicit scan request. 286 */ 287 if (arg != 0) 288 ieee80211_scan_assoc_fail(vap, 289 vap->iv_bss->ni_macaddr, arg); 290 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 291 ieee80211_check_scan_current(vap); 292 break; 293 case IEEE80211_S_RUN: /* beacon miss */ 294 /* 295 * Beacon miss. Notify user space and if not 296 * under control of a user application (roaming 297 * manual) kick off a scan to re-connect. 298 */ 299 ieee80211_sta_leave(ni); 300 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 301 ieee80211_check_scan_current(vap); 302 break; 303 default: 304 goto invalid; 305 } 306 break; 307 case IEEE80211_S_AUTH: 308 switch (ostate) { 309 case IEEE80211_S_INIT: 310 case IEEE80211_S_SCAN: 311 IEEE80211_SEND_MGMT(ni, 312 IEEE80211_FC0_SUBTYPE_AUTH, 1); 313 break; 314 case IEEE80211_S_AUTH: 315 case IEEE80211_S_ASSOC: 316 switch (arg & 0xff) { 317 case IEEE80211_FC0_SUBTYPE_AUTH: 318 /* ??? */ 319 IEEE80211_SEND_MGMT(ni, 320 IEEE80211_FC0_SUBTYPE_AUTH, 2); 321 break; 322 case IEEE80211_FC0_SUBTYPE_DEAUTH: 323 sta_authretry(vap, ni, arg>>8); 324 break; 325 } 326 break; 327 case IEEE80211_S_RUN: 328 switch (arg & 0xff) { 329 case IEEE80211_FC0_SUBTYPE_AUTH: 330 IEEE80211_SEND_MGMT(ni, 331 IEEE80211_FC0_SUBTYPE_AUTH, 2); 332 vap->iv_state = ostate; /* stay RUN */ 333 break; 334 case IEEE80211_FC0_SUBTYPE_DEAUTH: 335 ieee80211_sta_leave(ni); 336 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 337 /* try to reauth */ 338 IEEE80211_SEND_MGMT(ni, 339 IEEE80211_FC0_SUBTYPE_AUTH, 1); 340 } 341 break; 342 } 343 break; 344 default: 345 goto invalid; 346 } 347 break; 348 case IEEE80211_S_ASSOC: 349 switch (ostate) { 350 case IEEE80211_S_AUTH: 351 case IEEE80211_S_ASSOC: 352 IEEE80211_SEND_MGMT(ni, 353 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 354 break; 355 case IEEE80211_S_SLEEP: /* cannot happen */ 356 case IEEE80211_S_RUN: 357 ieee80211_sta_leave(ni); 358 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 359 IEEE80211_SEND_MGMT(ni, arg ? 360 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 361 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 362 } 363 break; 364 default: 365 goto invalid; 366 } 367 break; 368 case IEEE80211_S_RUN: 369 if (vap->iv_flags & IEEE80211_F_WPA) { 370 /* XXX validate prerequisites */ 371 } 372 switch (ostate) { 373 case IEEE80211_S_RUN: 374 case IEEE80211_S_CSA: 375 break; 376 case IEEE80211_S_AUTH: /* when join is done in fw */ 377 case IEEE80211_S_ASSOC: 378 #ifdef IEEE80211_DEBUG 379 if (ieee80211_msg_debug(vap)) { 380 ieee80211_note(vap, "%s with %s ssid ", 381 (vap->iv_opmode == IEEE80211_M_STA ? 382 "associated" : "synchronized"), 383 kether_ntoa(ni->ni_bssid, ethstr)); 384 ieee80211_print_essid(vap->iv_bss->ni_essid, 385 ni->ni_esslen); 386 /* XXX MCS/HT */ 387 kprintf(" channel %d start %uMb\n", 388 ieee80211_chan2ieee(ic, ic->ic_curchan), 389 IEEE80211_RATE2MBS(ni->ni_txrate)); 390 } 391 #endif 392 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 393 ieee80211_notify_node_join(ni, 394 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 395 break; 396 case IEEE80211_S_SLEEP: 397 ieee80211_sta_pwrsave(vap, 0); 398 break; 399 default: 400 goto invalid; 401 } 402 ieee80211_sync_curchan(ic); 403 if (ostate != IEEE80211_S_RUN && 404 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 405 /* 406 * Start s/w beacon miss timer for devices w/o 407 * hardware support. We fudge a bit here since 408 * we're doing this in software. 409 */ 410 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 411 2 * vap->iv_bmissthreshold * ni->ni_intval); 412 vap->iv_swbmiss_count = 0; 413 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 414 ieee80211_swbmiss_callout, vap); 415 } 416 /* 417 * When 802.1x is not in use mark the port authorized 418 * at this point so traffic can flow. 419 */ 420 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 421 ieee80211_node_authorize(ni); 422 /* 423 * Fake association when joining an existing bss. 424 */ 425 if (ic->ic_newassoc != NULL) 426 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 427 break; 428 case IEEE80211_S_CSA: 429 if (ostate != IEEE80211_S_RUN) 430 goto invalid; 431 break; 432 case IEEE80211_S_SLEEP: 433 ieee80211_sta_pwrsave(vap, 1); 434 break; 435 default: 436 invalid: 437 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 438 "%s: unexpected state transition %s -> %s\n", __func__, 439 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 440 break; 441 } 442 return 0; 443 } 444 445 /* 446 * Return non-zero if the frame is an echo of a multicast 447 * frame sent by ourself. The dir is known to be DSTODS. 448 */ 449 static __inline int 450 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 451 { 452 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 453 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 454 const uint8_t *sa; 455 456 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 457 458 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 459 return 0; 460 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 461 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 462 #undef WH4 463 #undef QWH4 464 } 465 466 /* 467 * Return non-zero if the frame is an echo of a multicast 468 * frame sent by ourself. The dir is known to be FROMDS. 469 */ 470 static __inline int 471 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 472 { 473 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 474 475 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 476 return 0; 477 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 478 } 479 480 /* 481 * Decide if a received management frame should be 482 * printed when debugging is enabled. This filters some 483 * of the less interesting frames that come frequently 484 * (e.g. beacons). 485 */ 486 static __inline int 487 doprint(struct ieee80211vap *vap, int subtype) 488 { 489 switch (subtype) { 490 case IEEE80211_FC0_SUBTYPE_BEACON: 491 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 492 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 493 return 0; 494 } 495 return 1; 496 } 497 498 /* 499 * Process a received frame. The node associated with the sender 500 * should be supplied. If nothing was found in the node table then 501 * the caller is assumed to supply a reference to iv_bss instead. 502 * The RSSI and a timestamp are also supplied. The RSSI data is used 503 * during AP scanning to select a AP to associate with; it can have 504 * any units so long as values have consistent units and higher values 505 * mean ``better signal''. The receive timestamp is currently not used 506 * by the 802.11 layer. 507 */ 508 static int 509 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 510 { 511 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 512 #define HAS_SEQ(type) ((type & 0x4) == 0) 513 struct ieee80211vap *vap = ni->ni_vap; 514 struct ieee80211com *ic = ni->ni_ic; 515 struct ifnet *ifp = vap->iv_ifp; 516 struct ieee80211_frame *wh; 517 struct ieee80211_key *key; 518 struct ether_header *eh; 519 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 520 uint8_t dir, type, subtype, qos; 521 uint8_t *bssid; 522 uint16_t rxseq; 523 #ifdef IEEE80211_DEBUG 524 char ethstr[ETHER_ADDRSTRLEN + 1]; 525 #endif 526 527 if (m->m_flags & M_AMPDU_MPDU) { 528 /* 529 * Fastpath for A-MPDU reorder q resubmission. Frames 530 * w/ M_AMPDU_MPDU marked have already passed through 531 * here but were received out of order and been held on 532 * the reorder queue. When resubmitted they are marked 533 * with the M_AMPDU_MPDU flag and we can bypass most of 534 * the normal processing. 535 */ 536 wh = mtod(m, struct ieee80211_frame *); 537 type = IEEE80211_FC0_TYPE_DATA; 538 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 539 subtype = IEEE80211_FC0_SUBTYPE_QOS; 540 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 541 goto resubmit_ampdu; 542 } 543 544 KASSERT(ni != NULL, ("null node")); 545 ni->ni_inact = ni->ni_inact_reload; 546 547 type = -1; /* undefined */ 548 549 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 550 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 551 ni->ni_macaddr, NULL, 552 "too short (1): len %u", m->m_pkthdr.len); 553 vap->iv_stats.is_rx_tooshort++; 554 goto out; 555 } 556 /* 557 * Bit of a cheat here, we use a pointer for a 3-address 558 * frame format but don't reference fields past outside 559 * ieee80211_frame_min w/o first validating the data is 560 * present. 561 */ 562 wh = mtod(m, struct ieee80211_frame *); 563 564 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 565 IEEE80211_FC0_VERSION_0) { 566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 567 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 568 wh->i_fc[0], wh->i_fc[1]); 569 vap->iv_stats.is_rx_badversion++; 570 goto err; 571 } 572 573 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 574 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 575 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 576 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 577 bssid = wh->i_addr2; 578 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 579 /* not interested in */ 580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 581 bssid, NULL, "%s", "not to bss"); 582 vap->iv_stats.is_rx_wrongbss++; 583 goto out; 584 } 585 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 586 ni->ni_noise = nf; 587 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 588 uint8_t tid = ieee80211_gettid(wh); 589 if (IEEE80211_QOS_HAS_SEQ(wh) && 590 TID_TO_WME_AC(tid) >= WME_AC_VI) 591 ic->ic_wme.wme_hipri_traffic++; 592 rxseq = le16toh(*(uint16_t *)wh->i_seq); 593 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 594 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 595 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 596 /* duplicate, discard */ 597 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 598 bssid, "duplicate", 599 "seqno <%u,%u> fragno <%u,%u> tid %u", 600 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 601 ni->ni_rxseqs[tid] >> 602 IEEE80211_SEQ_SEQ_SHIFT, 603 rxseq & IEEE80211_SEQ_FRAG_MASK, 604 ni->ni_rxseqs[tid] & 605 IEEE80211_SEQ_FRAG_MASK, 606 tid); 607 vap->iv_stats.is_rx_dup++; 608 IEEE80211_NODE_STAT(ni, rx_dup); 609 goto out; 610 } 611 ni->ni_rxseqs[tid] = rxseq; 612 } 613 } 614 615 switch (type) { 616 case IEEE80211_FC0_TYPE_DATA: 617 hdrspace = ieee80211_hdrspace(ic, wh); 618 if (m->m_len < hdrspace && 619 (m = m_pullup(m, hdrspace)) == NULL) { 620 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 621 ni->ni_macaddr, NULL, 622 "data too short: expecting %u", hdrspace); 623 vap->iv_stats.is_rx_tooshort++; 624 goto out; /* XXX */ 625 } 626 /* 627 * Handle A-MPDU re-ordering. If the frame is to be 628 * processed directly then ieee80211_ampdu_reorder 629 * will return 0; otherwise it has consumed the mbuf 630 * and we should do nothing more with it. 631 */ 632 if ((m->m_flags & M_AMPDU) && 633 (dir == IEEE80211_FC1_DIR_FROMDS || 634 dir == IEEE80211_FC1_DIR_DSTODS) && 635 ieee80211_ampdu_reorder(ni, m) != 0) { 636 m = NULL; 637 goto out; 638 } 639 resubmit_ampdu: 640 if (dir == IEEE80211_FC1_DIR_FROMDS) { 641 if ((ifp->if_flags & IFF_SIMPLEX) && 642 isfromds_mcastecho(vap, wh)) { 643 /* 644 * In IEEE802.11 network, multicast 645 * packets sent from "me" are broadcast 646 * from the AP; silently discard for 647 * SIMPLEX interface. 648 */ 649 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 650 wh, "data", "%s", "multicast echo"); 651 vap->iv_stats.is_rx_mcastecho++; 652 goto out; 653 } 654 if ((vap->iv_flags & IEEE80211_F_DWDS) && 655 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 656 /* 657 * DWDS sta's must drop 3-address mcast frames 658 * as they will be sent separately as a 4-addr 659 * frame. Accepting the 3-addr frame will 660 * confuse the bridge into thinking the sending 661 * sta is located at the end of WDS link. 662 */ 663 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 664 "3-address data", "%s", "DWDS enabled"); 665 vap->iv_stats.is_rx_mcastecho++; 666 goto out; 667 } 668 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 669 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 670 IEEE80211_DISCARD(vap, 671 IEEE80211_MSG_INPUT, wh, "4-address data", 672 "%s", "DWDS not enabled"); 673 vap->iv_stats.is_rx_wrongdir++; 674 goto out; 675 } 676 if ((ifp->if_flags & IFF_SIMPLEX) && 677 isdstods_mcastecho(vap, wh)) { 678 /* 679 * In IEEE802.11 network, multicast 680 * packets sent from "me" are broadcast 681 * from the AP; silently discard for 682 * SIMPLEX interface. 683 */ 684 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 685 "4-address data", "%s", "multicast echo"); 686 vap->iv_stats.is_rx_mcastecho++; 687 goto out; 688 } 689 } else { 690 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 691 "data", "incorrect dir 0x%x", dir); 692 vap->iv_stats.is_rx_wrongdir++; 693 goto out; 694 } 695 696 /* 697 * Handle privacy requirements. Note that we 698 * must not be preempted from here until after 699 * we (potentially) call ieee80211_crypto_demic; 700 * otherwise we may violate assumptions in the 701 * crypto cipher modules used to do delayed update 702 * of replay sequence numbers. 703 */ 704 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 705 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 706 /* 707 * Discard encrypted frames when privacy is off. 708 */ 709 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 710 wh, "WEP", "%s", "PRIVACY off"); 711 vap->iv_stats.is_rx_noprivacy++; 712 IEEE80211_NODE_STAT(ni, rx_noprivacy); 713 goto out; 714 } 715 key = ieee80211_crypto_decap(ni, m, hdrspace); 716 if (key == NULL) { 717 /* NB: stats+msgs handled in crypto_decap */ 718 IEEE80211_NODE_STAT(ni, rx_wepfail); 719 goto out; 720 } 721 wh = mtod(m, struct ieee80211_frame *); 722 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 723 } else { 724 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 725 key = NULL; 726 } 727 728 /* 729 * Save QoS bits for use below--before we strip the header. 730 */ 731 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 732 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 733 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 734 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 735 } else 736 qos = 0; 737 738 /* 739 * Next up, any fragmentation. 740 */ 741 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 742 m = ieee80211_defrag(ni, m, hdrspace); 743 if (m == NULL) { 744 /* Fragment dropped or frame not complete yet */ 745 goto out; 746 } 747 } 748 wh = NULL; /* no longer valid, catch any uses */ 749 750 /* 751 * Next strip any MSDU crypto bits. 752 */ 753 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 754 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 755 ni->ni_macaddr, "data", "%s", "demic error"); 756 vap->iv_stats.is_rx_demicfail++; 757 IEEE80211_NODE_STAT(ni, rx_demicfail); 758 goto out; 759 } 760 761 /* copy to listener after decrypt */ 762 if (ieee80211_radiotap_active_vap(vap)) 763 ieee80211_radiotap_rx(vap, m); 764 need_tap = 0; 765 766 /* 767 * Finally, strip the 802.11 header. 768 */ 769 m = ieee80211_decap(vap, m, hdrspace); 770 if (m == NULL) { 771 /* XXX mask bit to check for both */ 772 /* don't count Null data frames as errors */ 773 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 774 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 775 goto out; 776 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 777 ni->ni_macaddr, "data", "%s", "decap error"); 778 vap->iv_stats.is_rx_decap++; 779 IEEE80211_NODE_STAT(ni, rx_decap); 780 goto err; 781 } 782 eh = mtod(m, struct ether_header *); 783 if (!ieee80211_node_is_authorized(ni)) { 784 /* 785 * Deny any non-PAE frames received prior to 786 * authorization. For open/shared-key 787 * authentication the port is mark authorized 788 * after authentication completes. For 802.1x 789 * the port is not marked authorized by the 790 * authenticator until the handshake has completed. 791 */ 792 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 793 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 794 eh->ether_shost, "data", 795 "unauthorized port: ether type 0x%x len %u", 796 eh->ether_type, m->m_pkthdr.len); 797 vap->iv_stats.is_rx_unauth++; 798 IEEE80211_NODE_STAT(ni, rx_unauth); 799 goto err; 800 } 801 } else { 802 /* 803 * When denying unencrypted frames, discard 804 * any non-PAE frames received without encryption. 805 */ 806 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 807 (key == NULL && (m->m_flags & M_WEP) == 0) && 808 eh->ether_type != htons(ETHERTYPE_PAE)) { 809 /* 810 * Drop unencrypted frames. 811 */ 812 vap->iv_stats.is_rx_unencrypted++; 813 IEEE80211_NODE_STAT(ni, rx_unencrypted); 814 goto out; 815 } 816 } 817 /* XXX require HT? */ 818 if (qos & IEEE80211_QOS_AMSDU) { 819 m = ieee80211_decap_amsdu(ni, m); 820 if (m == NULL) 821 return IEEE80211_FC0_TYPE_DATA; 822 } else { 823 #ifdef IEEE80211_SUPPORT_SUPERG 824 m = ieee80211_decap_fastframe(vap, ni, m); 825 if (m == NULL) 826 return IEEE80211_FC0_TYPE_DATA; 827 #endif 828 } 829 ieee80211_deliver_data(vap, ni, m); 830 return IEEE80211_FC0_TYPE_DATA; 831 832 case IEEE80211_FC0_TYPE_MGT: 833 vap->iv_stats.is_rx_mgmt++; 834 IEEE80211_NODE_STAT(ni, rx_mgmt); 835 if (dir != IEEE80211_FC1_DIR_NODS) { 836 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 837 wh, "data", "incorrect dir 0x%x", dir); 838 vap->iv_stats.is_rx_wrongdir++; 839 goto err; 840 } 841 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 842 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 843 ni->ni_macaddr, "mgt", "too short: len %u", 844 m->m_pkthdr.len); 845 vap->iv_stats.is_rx_tooshort++; 846 goto out; 847 } 848 #ifdef IEEE80211_DEBUG 849 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 850 ieee80211_msg_dumppkts(vap)) { 851 if_printf(ifp, "received %s from %s rssi %d\n", 852 ieee80211_mgt_subtype_name[subtype >> 853 IEEE80211_FC0_SUBTYPE_SHIFT], 854 kether_ntoa(wh->i_addr2, ethstr), rssi); 855 } 856 #endif 857 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 858 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 859 /* 860 * Only shared key auth frames with a challenge 861 * should be encrypted, discard all others. 862 */ 863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 864 wh, ieee80211_mgt_subtype_name[subtype >> 865 IEEE80211_FC0_SUBTYPE_SHIFT], 866 "%s", "WEP set but not permitted"); 867 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 868 goto out; 869 } 870 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 871 /* 872 * Discard encrypted frames when privacy is off. 873 */ 874 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 875 wh, "mgt", "%s", "WEP set but PRIVACY off"); 876 vap->iv_stats.is_rx_noprivacy++; 877 goto out; 878 } 879 hdrspace = ieee80211_hdrspace(ic, wh); 880 key = ieee80211_crypto_decap(ni, m, hdrspace); 881 if (key == NULL) { 882 /* NB: stats+msgs handled in crypto_decap */ 883 goto out; 884 } 885 wh = mtod(m, struct ieee80211_frame *); 886 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 887 } 888 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 889 goto out; 890 891 case IEEE80211_FC0_TYPE_CTL: 892 vap->iv_stats.is_rx_ctl++; 893 IEEE80211_NODE_STAT(ni, rx_ctrl); 894 vap->iv_recv_ctl(ni, m, subtype); 895 goto out; 896 897 default: 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 899 wh, NULL, "bad frame type 0x%x", type); 900 /* should not come here */ 901 break; 902 } 903 err: 904 IFNET_STAT_INC(ifp, ierrors, 1); 905 out: 906 if (m != NULL) { 907 if (need_tap && ieee80211_radiotap_active_vap(vap)) 908 ieee80211_radiotap_rx(vap, m); 909 m_freem(m); 910 } 911 return type; 912 #undef SEQ_LEQ 913 } 914 915 static void 916 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 917 int rssi, int nf, uint16_t seq, uint16_t status) 918 { 919 struct ieee80211vap *vap = ni->ni_vap; 920 921 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 922 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 923 ni->ni_macaddr, "open auth", 924 "bad sta auth mode %u", ni->ni_authmode); 925 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 926 return; 927 } 928 if (vap->iv_state != IEEE80211_S_AUTH || 929 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 930 vap->iv_stats.is_rx_bad_auth++; 931 return; 932 } 933 if (status != 0) { 934 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 935 ni, "open auth failed (reason %d)", status); 936 vap->iv_stats.is_rx_auth_fail++; 937 vap->iv_stats.is_rx_authfail_code = status; 938 ieee80211_new_state(vap, IEEE80211_S_SCAN, 939 IEEE80211_SCAN_FAIL_STATUS); 940 } else 941 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 942 } 943 944 static void 945 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 946 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 947 uint16_t seq, uint16_t status) 948 { 949 struct ieee80211vap *vap = ni->ni_vap; 950 uint8_t *challenge; 951 952 /* 953 * NB: this can happen as we allow pre-shared key 954 * authentication to be enabled w/o wep being turned 955 * on so that configuration of these can be done 956 * in any order. It may be better to enforce the 957 * ordering in which case this check would just be 958 * for sanity/consistency. 959 */ 960 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 961 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 962 ni->ni_macaddr, "shared key auth", 963 "%s", " PRIVACY is disabled"); 964 goto bad; 965 } 966 /* 967 * Pre-shared key authentication is evil; accept 968 * it only if explicitly configured (it is supported 969 * mainly for compatibility with clients like OS X). 970 */ 971 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 972 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 973 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 974 ni->ni_macaddr, "shared key auth", 975 "bad sta auth mode %u", ni->ni_authmode); 976 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 977 goto bad; 978 } 979 980 challenge = NULL; 981 if (frm + 1 < efrm) { 982 if ((frm[1] + 2) > (efrm - frm)) { 983 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 984 ni->ni_macaddr, "shared key auth", 985 "ie %d/%d too long", 986 frm[0], (int)((frm[1] + 2) - (efrm - frm))); 987 vap->iv_stats.is_rx_bad_auth++; 988 goto bad; 989 } 990 if (*frm == IEEE80211_ELEMID_CHALLENGE) 991 challenge = frm; 992 frm += frm[1] + 2; 993 } 994 switch (seq) { 995 case IEEE80211_AUTH_SHARED_CHALLENGE: 996 case IEEE80211_AUTH_SHARED_RESPONSE: 997 if (challenge == NULL) { 998 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 999 ni->ni_macaddr, "shared key auth", 1000 "%s", "no challenge"); 1001 vap->iv_stats.is_rx_bad_auth++; 1002 goto bad; 1003 } 1004 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1005 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1006 ni->ni_macaddr, "shared key auth", 1007 "bad challenge len %d", challenge[1]); 1008 vap->iv_stats.is_rx_bad_auth++; 1009 goto bad; 1010 } 1011 default: 1012 break; 1013 } 1014 if (vap->iv_state != IEEE80211_S_AUTH) 1015 return; 1016 switch (seq) { 1017 case IEEE80211_AUTH_SHARED_PASS: 1018 if (ni->ni_challenge != NULL) { 1019 kfree(ni->ni_challenge, M_80211_NODE); 1020 ni->ni_challenge = NULL; 1021 } 1022 if (status != 0) { 1023 IEEE80211_NOTE_FRAME(vap, 1024 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1025 "shared key auth failed (reason %d)", status); 1026 vap->iv_stats.is_rx_auth_fail++; 1027 vap->iv_stats.is_rx_authfail_code = status; 1028 return; 1029 } 1030 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1031 break; 1032 case IEEE80211_AUTH_SHARED_CHALLENGE: 1033 if (!ieee80211_alloc_challenge(ni)) 1034 return; 1035 /* XXX could optimize by passing recvd challenge */ 1036 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1037 IEEE80211_SEND_MGMT(ni, 1038 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1039 break; 1040 default: 1041 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1042 wh, "shared key auth", "bad seq %d", seq); 1043 vap->iv_stats.is_rx_bad_auth++; 1044 return; 1045 } 1046 return; 1047 bad: 1048 /* 1049 * Kick the state machine. This short-circuits 1050 * using the mgt frame timeout to trigger the 1051 * state transition. 1052 */ 1053 if (vap->iv_state == IEEE80211_S_AUTH) 1054 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1055 IEEE80211_SCAN_FAIL_STATUS); 1056 } 1057 1058 static int 1059 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1060 const struct ieee80211_frame *wh) 1061 { 1062 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1063 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1064 u_int len = frm[1], qosinfo; 1065 int i; 1066 1067 if (len < sizeof(struct ieee80211_wme_param)-2) { 1068 IEEE80211_DISCARD_IE(vap, 1069 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1070 wh, "WME", "too short, len %u", len); 1071 return -1; 1072 } 1073 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1074 qosinfo &= WME_QOSINFO_COUNT; 1075 /* XXX do proper check for wraparound */ 1076 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1077 return 0; 1078 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1079 for (i = 0; i < WME_NUM_AC; i++) { 1080 struct wmeParams *wmep = 1081 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1082 /* NB: ACI not used */ 1083 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1084 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1085 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1086 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1087 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1088 frm += 4; 1089 } 1090 wme->wme_wmeChanParams.cap_info = qosinfo; 1091 return 1; 1092 #undef MS 1093 } 1094 1095 /* 1096 * Process 11h Channel Switch Announcement (CSA) ie. If this 1097 * is the first CSA then initiate the switch. Otherwise we 1098 * track state and trigger completion and/or cancel of the switch. 1099 * XXX should be public for IBSS use 1100 */ 1101 static void 1102 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1103 const struct ieee80211_frame *wh) 1104 { 1105 struct ieee80211com *ic = vap->iv_ic; 1106 const struct ieee80211_csa_ie *csa = 1107 (const struct ieee80211_csa_ie *) frm; 1108 1109 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1110 ("state %s", ieee80211_state_name[vap->iv_state])); 1111 1112 if (csa->csa_mode > 1) { 1113 IEEE80211_DISCARD_IE(vap, 1114 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1115 wh, "CSA", "invalid mode %u", csa->csa_mode); 1116 return; 1117 } 1118 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1119 /* 1120 * Convert the channel number to a channel reference. We 1121 * try first to preserve turbo attribute of the current 1122 * channel then fallback. Note this will not work if the 1123 * CSA specifies a channel that requires a band switch (e.g. 1124 * 11a => 11g). This is intentional as 11h is defined only 1125 * for 5GHz/11a and because the switch does not involve a 1126 * reassociation, protocol state (capabilities, negotated 1127 * rates, etc) may/will be wrong. 1128 */ 1129 struct ieee80211_channel *c = 1130 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1131 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1132 if (c == NULL) { 1133 c = ieee80211_find_channel_byieee(ic, 1134 csa->csa_newchan, 1135 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1136 if (c == NULL) { 1137 IEEE80211_DISCARD_IE(vap, 1138 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1139 wh, "CSA", "invalid channel %u", 1140 csa->csa_newchan); 1141 goto done; 1142 } 1143 } 1144 #if IEEE80211_CSA_COUNT_MIN > 0 1145 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1146 /* 1147 * Require at least IEEE80211_CSA_COUNT_MIN count to 1148 * reduce the risk of being redirected by a fabricated 1149 * CSA. If a valid CSA is dropped we'll still get a 1150 * beacon miss when the AP leaves the channel so we'll 1151 * eventually follow to the new channel. 1152 * 1153 * NOTE: this violates the 11h spec that states that 1154 * count may be any value and if 0 then a switch 1155 * should happen asap. 1156 */ 1157 IEEE80211_DISCARD_IE(vap, 1158 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1159 wh, "CSA", "count %u too small, must be >= %u", 1160 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1161 goto done; 1162 } 1163 #endif 1164 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1165 } else { 1166 /* 1167 * Validate this ie against the initial CSA. We require 1168 * mode and channel not change and the count must be 1169 * monotonically decreasing. This may be pointless and 1170 * canceling the switch as a result may be too paranoid but 1171 * in the worst case if we drop out of CSA because of this 1172 * and the AP does move then we'll just end up taking a 1173 * beacon miss and scan to find the AP. 1174 * 1175 * XXX may want <= on count as we also process ProbeResp 1176 * frames and those may come in w/ the same count as the 1177 * previous beacon; but doing so leaves us open to a stuck 1178 * count until we add a dead-man timer 1179 */ 1180 if (!(csa->csa_count < ic->ic_csa_count && 1181 csa->csa_mode == ic->ic_csa_mode && 1182 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1183 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1184 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1185 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1186 ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count, 1187 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1188 ieee80211_csa_cancelswitch(ic); 1189 } else { 1190 if (csa->csa_count <= 1) 1191 ieee80211_csa_completeswitch(ic); 1192 else 1193 ic->ic_csa_count = csa->csa_count; 1194 } 1195 } 1196 done: 1197 ; 1198 } 1199 1200 /* 1201 * Return non-zero if a background scan may be continued: 1202 * o bg scan is active 1203 * o no channel switch is pending 1204 * o there has not been any traffic recently 1205 * 1206 * Note we do not check if there is an administrative enable; 1207 * this is only done to start the scan. We assume that any 1208 * change in state will be accompanied by a request to cancel 1209 * active scans which will otherwise cause this test to fail. 1210 */ 1211 static __inline int 1212 contbgscan(struct ieee80211vap *vap) 1213 { 1214 struct ieee80211com *ic = vap->iv_ic; 1215 1216 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1217 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1218 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1219 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1220 } 1221 1222 /* 1223 * Return non-zero if a backgrond scan may be started: 1224 * o bg scanning is administratively enabled 1225 * o no channel switch is pending 1226 * o we are not boosted on a dynamic turbo channel 1227 * o there has not been a scan recently 1228 * o there has not been any traffic recently 1229 */ 1230 static __inline int 1231 startbgscan(struct ieee80211vap *vap) 1232 { 1233 struct ieee80211com *ic = vap->iv_ic; 1234 1235 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1236 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1237 #ifdef IEEE80211_SUPPORT_SUPERG 1238 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1239 #endif 1240 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1241 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1242 } 1243 1244 static void 1245 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1246 int subtype, int rssi, int nf) 1247 { 1248 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1249 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1250 struct ieee80211vap *vap = ni->ni_vap; 1251 struct ieee80211com *ic = ni->ni_ic; 1252 struct ieee80211_frame *wh; 1253 uint8_t *frm, *efrm; 1254 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1255 uint8_t rate; 1256 1257 wh = mtod(m0, struct ieee80211_frame *); 1258 frm = (uint8_t *)&wh[1]; 1259 efrm = mtod(m0, uint8_t *) + m0->m_len; 1260 switch (subtype) { 1261 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1262 case IEEE80211_FC0_SUBTYPE_BEACON: { 1263 struct ieee80211_scanparams scan; 1264 /* 1265 * We process beacon/probe response frames: 1266 * o when scanning, or 1267 * o station mode when associated (to collect state 1268 * updates such as 802.11g slot time) 1269 * Frames otherwise received are discarded. 1270 */ 1271 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1272 vap->iv_stats.is_rx_mgtdiscard++; 1273 return; 1274 } 1275 /* XXX probe response in sta mode when !scanning? */ 1276 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1277 return; 1278 /* 1279 * Count frame now that we know it's to be processed. 1280 */ 1281 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1282 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1283 IEEE80211_NODE_STAT(ni, rx_beacons); 1284 } else 1285 IEEE80211_NODE_STAT(ni, rx_proberesp); 1286 /* 1287 * When operating in station mode, check for state updates. 1288 * Be careful to ignore beacons received while doing a 1289 * background scan. We consider only 11g/WMM stuff right now. 1290 */ 1291 if (ni->ni_associd != 0 && 1292 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1293 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1294 /* record tsf of last beacon */ 1295 memcpy(ni->ni_tstamp.data, scan.tstamp, 1296 sizeof(ni->ni_tstamp)); 1297 /* count beacon frame for s/w bmiss handling */ 1298 vap->iv_swbmiss_count++; 1299 vap->iv_bmiss_count = 0; 1300 if (ni->ni_erp != scan.erp) { 1301 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1302 wh->i_addr2, 1303 "erp change: was 0x%x, now 0x%x", 1304 ni->ni_erp, scan.erp); 1305 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1306 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1307 ic->ic_flags |= IEEE80211_F_USEPROT; 1308 else 1309 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1310 ni->ni_erp = scan.erp; 1311 /* XXX statistic */ 1312 /* XXX driver notification */ 1313 } 1314 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1315 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1316 wh->i_addr2, 1317 "capabilities change: was 0x%x, now 0x%x", 1318 ni->ni_capinfo, scan.capinfo); 1319 /* 1320 * NB: we assume short preamble doesn't 1321 * change dynamically 1322 */ 1323 ieee80211_set_shortslottime(ic, 1324 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1325 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1326 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1327 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1328 /* XXX statistic */ 1329 } 1330 if (scan.wme != NULL && 1331 (ni->ni_flags & IEEE80211_NODE_QOS) && 1332 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1333 ieee80211_wme_updateparams(vap); 1334 #ifdef IEEE80211_SUPPORT_SUPERG 1335 if (scan.ath != NULL) 1336 ieee80211_parse_athparams(ni, scan.ath, wh); 1337 #endif 1338 if (scan.htcap != NULL && scan.htinfo != NULL && 1339 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1340 ieee80211_ht_updateparams(ni, 1341 scan.htcap, scan.htinfo); 1342 /* XXX state changes? */ 1343 } 1344 if (scan.tim != NULL) { 1345 struct ieee80211_tim_ie *tim = 1346 (struct ieee80211_tim_ie *) scan.tim; 1347 #if 0 1348 int aid = IEEE80211_AID(ni->ni_associd); 1349 int ix = aid / NBBY; 1350 int min = tim->tim_bitctl &~ 1; 1351 int max = tim->tim_len + min - 4; 1352 if ((tim->tim_bitctl&1) || 1353 (min <= ix && ix <= max && 1354 isset(tim->tim_bitmap - min, aid))) { 1355 /* 1356 * XXX Do not let bg scan kick off 1357 * we are expecting data. 1358 */ 1359 ic->ic_lastdata = ticks; 1360 ieee80211_sta_pwrsave(vap, 0); 1361 } 1362 #endif 1363 ni->ni_dtim_count = tim->tim_count; 1364 ni->ni_dtim_period = tim->tim_period; 1365 } 1366 if (scan.csa != NULL && 1367 (vap->iv_flags & IEEE80211_F_DOTH)) 1368 ieee80211_parse_csaparams(vap, scan.csa, wh); 1369 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1370 /* 1371 * No CSA ie or 11h disabled, but a channel 1372 * switch is pending; drop out so we aren't 1373 * stuck in CSA state. If the AP really is 1374 * moving we'll get a beacon miss and scan. 1375 */ 1376 ieee80211_csa_cancelswitch(ic); 1377 } 1378 /* 1379 * If scanning, pass the info to the scan module. 1380 * Otherwise, check if it's the right time to do 1381 * a background scan. Background scanning must 1382 * be enabled and we must not be operating in the 1383 * turbo phase of dynamic turbo mode. Then, 1384 * it's been a while since the last background 1385 * scan and if no data frames have come through 1386 * recently, kick off a scan. Note that this 1387 * is the mechanism by which a background scan 1388 * is started _and_ continued each time we 1389 * return on-channel to receive a beacon from 1390 * our ap. 1391 */ 1392 if (ic->ic_flags & IEEE80211_F_SCAN) { 1393 ieee80211_add_scan(vap, &scan, wh, 1394 subtype, rssi, nf); 1395 } else if (contbgscan(vap)) { 1396 ieee80211_bg_scan(vap, 0); 1397 } else if (startbgscan(vap)) { 1398 vap->iv_stats.is_scan_bg++; 1399 #if 0 1400 /* wakeup if we are sleeing */ 1401 ieee80211_set_pwrsave(vap, 0); 1402 #endif 1403 ieee80211_bg_scan(vap, 0); 1404 } 1405 return; 1406 } 1407 /* 1408 * If scanning, just pass information to the scan module. 1409 */ 1410 if (ic->ic_flags & IEEE80211_F_SCAN) { 1411 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1412 /* 1413 * Actively scanning a channel marked passive; 1414 * send a probe request now that we know there 1415 * is 802.11 traffic present. 1416 * 1417 * XXX check if the beacon we recv'd gives 1418 * us what we need and suppress the probe req 1419 */ 1420 ieee80211_probe_curchan(vap, 1); 1421 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1422 } 1423 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1424 return; 1425 } 1426 break; 1427 } 1428 1429 case IEEE80211_FC0_SUBTYPE_AUTH: { 1430 uint16_t algo, seq, status; 1431 /* 1432 * auth frame format 1433 * [2] algorithm 1434 * [2] sequence 1435 * [2] status 1436 * [tlv*] challenge 1437 */ 1438 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1439 algo = le16toh(*(uint16_t *)frm); 1440 seq = le16toh(*(uint16_t *)(frm + 2)); 1441 status = le16toh(*(uint16_t *)(frm + 4)); 1442 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1443 "recv auth frame with algorithm %d seq %d", algo, seq); 1444 1445 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1446 IEEE80211_DISCARD(vap, 1447 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1448 wh, "auth", "%s", "TKIP countermeasures enabled"); 1449 vap->iv_stats.is_rx_auth_countermeasures++; 1450 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1451 ieee80211_send_error(ni, wh->i_addr2, 1452 IEEE80211_FC0_SUBTYPE_AUTH, 1453 IEEE80211_REASON_MIC_FAILURE); 1454 } 1455 return; 1456 } 1457 if (algo == IEEE80211_AUTH_ALG_SHARED) 1458 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1459 seq, status); 1460 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1461 sta_auth_open(ni, wh, rssi, nf, seq, status); 1462 else { 1463 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1464 wh, "auth", "unsupported alg %d", algo); 1465 vap->iv_stats.is_rx_auth_unsupported++; 1466 return; 1467 } 1468 break; 1469 } 1470 1471 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1472 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1473 uint16_t capinfo, associd; 1474 uint16_t status; 1475 1476 if (vap->iv_state != IEEE80211_S_ASSOC) { 1477 vap->iv_stats.is_rx_mgtdiscard++; 1478 return; 1479 } 1480 1481 /* 1482 * asresp frame format 1483 * [2] capability information 1484 * [2] status 1485 * [2] association ID 1486 * [tlv] supported rates 1487 * [tlv] extended supported rates 1488 * [tlv] WME 1489 * [tlv] HT capabilities 1490 * [tlv] HT info 1491 */ 1492 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1493 ni = vap->iv_bss; 1494 capinfo = le16toh(*(uint16_t *)frm); 1495 frm += 2; 1496 status = le16toh(*(uint16_t *)frm); 1497 frm += 2; 1498 if (status != 0) { 1499 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1500 wh->i_addr2, "%sassoc failed (reason %d)", 1501 ISREASSOC(subtype) ? "re" : "", status); 1502 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1503 return; 1504 } 1505 associd = le16toh(*(uint16_t *)frm); 1506 frm += 2; 1507 1508 rates = xrates = wme = htcap = htinfo = NULL; 1509 while (efrm - frm > 1) { 1510 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1511 switch (*frm) { 1512 case IEEE80211_ELEMID_RATES: 1513 rates = frm; 1514 break; 1515 case IEEE80211_ELEMID_XRATES: 1516 xrates = frm; 1517 break; 1518 case IEEE80211_ELEMID_HTCAP: 1519 htcap = frm; 1520 break; 1521 case IEEE80211_ELEMID_HTINFO: 1522 htinfo = frm; 1523 break; 1524 case IEEE80211_ELEMID_VENDOR: 1525 if (iswmeoui(frm)) 1526 wme = frm; 1527 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1528 /* 1529 * Accept pre-draft HT ie's if the 1530 * standard ones have not been seen. 1531 */ 1532 if (ishtcapoui(frm)) { 1533 if (htcap == NULL) 1534 htcap = frm; 1535 } else if (ishtinfooui(frm)) { 1536 if (htinfo == NULL) 1537 htcap = frm; 1538 } 1539 } 1540 /* XXX Atheros OUI support */ 1541 break; 1542 } 1543 frm += frm[1] + 2; 1544 } 1545 1546 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1547 if (xrates != NULL) 1548 IEEE80211_VERIFY_ELEMENT(xrates, 1549 IEEE80211_RATE_MAXSIZE - rates[1], return); 1550 rate = ieee80211_setup_rates(ni, rates, xrates, 1551 IEEE80211_F_JOIN | 1552 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1553 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1554 if (rate & IEEE80211_RATE_BASIC) { 1555 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1556 wh->i_addr2, 1557 "%sassoc failed (rate set mismatch)", 1558 ISREASSOC(subtype) ? "re" : ""); 1559 vap->iv_stats.is_rx_assoc_norate++; 1560 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1561 IEEE80211_SCAN_FAIL_STATUS); 1562 return; 1563 } 1564 1565 ni->ni_capinfo = capinfo; 1566 ni->ni_associd = associd; 1567 if (ni->ni_jointime == 0) 1568 ni->ni_jointime = time_uptime; 1569 if (wme != NULL && 1570 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1571 ni->ni_flags |= IEEE80211_NODE_QOS; 1572 ieee80211_wme_updateparams(vap); 1573 } else 1574 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1575 /* 1576 * Setup HT state according to the negotiation. 1577 * 1578 * NB: shouldn't need to check if HT use is enabled but some 1579 * ap's send back HT ie's even when we don't indicate we 1580 * are HT capable in our AssocReq. 1581 */ 1582 if (htcap != NULL && htinfo != NULL && 1583 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1584 ieee80211_ht_node_init(ni); 1585 ieee80211_ht_updateparams(ni, htcap, htinfo); 1586 ieee80211_setup_htrates(ni, htcap, 1587 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1588 ieee80211_setup_basic_htrates(ni, htinfo); 1589 ieee80211_node_setuptxparms(ni); 1590 ieee80211_ratectl_node_init(ni); 1591 } else { 1592 #ifdef IEEE80211_SUPPORT_SUPERG 1593 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1594 ieee80211_ff_node_init(ni); 1595 #endif 1596 } 1597 /* 1598 * Configure state now that we are associated. 1599 * 1600 * XXX may need different/additional driver callbacks? 1601 */ 1602 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1603 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1604 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1605 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1606 } else { 1607 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1608 ic->ic_flags |= IEEE80211_F_USEBARKER; 1609 } 1610 ieee80211_set_shortslottime(ic, 1611 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1612 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1613 /* 1614 * Honor ERP protection. 1615 * 1616 * NB: ni_erp should zero for non-11g operation. 1617 */ 1618 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1619 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1620 ic->ic_flags |= IEEE80211_F_USEPROT; 1621 else 1622 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1623 IEEE80211_NOTE_MAC(vap, 1624 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1625 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1626 ISREASSOC(subtype) ? "re" : "", 1627 IEEE80211_NODE_AID(ni), 1628 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1629 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1630 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1631 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1632 ni->ni_flags & IEEE80211_NODE_HT ? 1633 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1634 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1635 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1636 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1637 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1638 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1639 ", fast-frames" : "", 1640 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1641 ", turbo" : "" 1642 ); 1643 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1644 break; 1645 } 1646 1647 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1648 uint16_t reason; 1649 1650 if (vap->iv_state == IEEE80211_S_SCAN) { 1651 vap->iv_stats.is_rx_mgtdiscard++; 1652 return; 1653 } 1654 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1655 /* NB: can happen when in promiscuous mode */ 1656 vap->iv_stats.is_rx_mgtdiscard++; 1657 break; 1658 } 1659 1660 /* 1661 * deauth frame format 1662 * [2] reason 1663 */ 1664 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1665 reason = le16toh(*(uint16_t *)frm); 1666 1667 vap->iv_stats.is_rx_deauth++; 1668 vap->iv_stats.is_rx_deauth_code = reason; 1669 IEEE80211_NODE_STAT(ni, rx_deauth); 1670 1671 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1672 "recv deauthenticate (reason %d)", reason); 1673 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1674 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1675 break; 1676 } 1677 1678 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1679 uint16_t reason; 1680 1681 if (vap->iv_state != IEEE80211_S_RUN && 1682 vap->iv_state != IEEE80211_S_ASSOC && 1683 vap->iv_state != IEEE80211_S_AUTH) { 1684 vap->iv_stats.is_rx_mgtdiscard++; 1685 return; 1686 } 1687 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1688 /* NB: can happen when in promiscuous mode */ 1689 vap->iv_stats.is_rx_mgtdiscard++; 1690 break; 1691 } 1692 1693 /* 1694 * disassoc frame format 1695 * [2] reason 1696 */ 1697 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1698 reason = le16toh(*(uint16_t *)frm); 1699 1700 vap->iv_stats.is_rx_disassoc++; 1701 vap->iv_stats.is_rx_disassoc_code = reason; 1702 IEEE80211_NODE_STAT(ni, rx_disassoc); 1703 1704 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1705 "recv disassociate (reason %d)", reason); 1706 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1707 break; 1708 } 1709 1710 case IEEE80211_FC0_SUBTYPE_ACTION: 1711 if (vap->iv_state == IEEE80211_S_RUN) { 1712 if (ieee80211_parse_action(ni, m0) == 0) 1713 ic->ic_recv_action(ni, wh, frm, efrm); 1714 } else 1715 vap->iv_stats.is_rx_mgtdiscard++; 1716 break; 1717 1718 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1719 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1720 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1721 vap->iv_stats.is_rx_mgtdiscard++; 1722 return; 1723 default: 1724 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1725 wh, "mgt", "subtype 0x%x not handled", subtype); 1726 vap->iv_stats.is_rx_badsubtype++; 1727 break; 1728 } 1729 #undef ISREASSOC 1730 #undef ISPROBE 1731 } 1732 1733 static void 1734 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1735 { 1736 } 1737