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sys/net80211/ieee80211_sta.c
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1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD: releng/8.1/sys/net80211/ieee80211_sta.c 206780 2010-04-17 23:48:07Z weongyo $"); 29 #endif 30 31 /* 32 * IEEE 802.11 Station mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_media.h> 52 #include <net/if_llc.h> 53 #include <net/ethernet.h> 54 55 #include <net/bpf.h> 56 57 #include <net80211/ieee80211_var.h> 58 #include <net80211/ieee80211_sta.h> 59 #include <net80211/ieee80211_input.h> 60 #ifdef IEEE80211_SUPPORT_SUPERG 61 #include <net80211/ieee80211_superg.h> 62 #endif 63 64 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 65 66 static void sta_vattach(struct ieee80211vap *); 67 static void sta_beacon_miss(struct ieee80211vap *); 68 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69 static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 70 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 71 int subtype, int rssi, int nf); 72 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 73 74 void 75 ieee80211_sta_attach(struct ieee80211com *ic) 76 { 77 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 78 } 79 80 void 81 ieee80211_sta_detach(struct ieee80211com *ic) 82 { 83 } 84 85 static void 86 sta_vdetach(struct ieee80211vap *vap) 87 { 88 } 89 90 static void 91 sta_vattach(struct ieee80211vap *vap) 92 { 93 vap->iv_newstate = sta_newstate; 94 vap->iv_input = sta_input; 95 vap->iv_recv_mgmt = sta_recv_mgmt; 96 vap->iv_recv_ctl = sta_recv_ctl; 97 vap->iv_opdetach = sta_vdetach; 98 vap->iv_bmiss = sta_beacon_miss; 99 } 100 101 /* 102 * Handle a beacon miss event. The common code filters out 103 * spurious events that can happen when scanning and/or before 104 * reaching RUN state. 105 */ 106 static void 107 sta_beacon_miss(struct ieee80211vap *vap) 108 { 109 struct ieee80211com *ic = vap->iv_ic; 110 111 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 112 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 113 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 114 115 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 116 "beacon miss, mode %s state %s\n", 117 ieee80211_opmode_name[vap->iv_opmode], 118 ieee80211_state_name[vap->iv_state]); 119 120 if (vap->iv_state == IEEE80211_S_CSA) { 121 /* 122 * A Channel Switch is pending; assume we missed the 123 * beacon that would've completed the process and just 124 * force the switch. If we made a mistake we'll not 125 * find the AP on the new channel and fall back to a 126 * normal scan. 127 */ 128 ieee80211_csa_completeswitch(ic); 129 return; 130 } 131 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 132 /* 133 * Send a directed probe req before falling back to a 134 * scan; if we receive a response ic_bmiss_count will 135 * be reset. Some cards mistakenly report beacon miss 136 * so this avoids the expensive scan if the ap is 137 * still there. 138 */ 139 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 140 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 141 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 142 return; 143 } 144 145 callout_stop(&vap->iv_swbmiss); 146 vap->iv_bmiss_count = 0; 147 vap->iv_stats.is_beacon_miss++; 148 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 149 #ifdef IEEE80211_SUPPORT_SUPERG 150 struct ieee80211com *ic = vap->iv_ic; 151 152 /* 153 * If we receive a beacon miss interrupt when using 154 * dynamic turbo, attempt to switch modes before 155 * reassociating. 156 */ 157 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 158 ieee80211_dturbo_switch(vap, 159 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 160 #endif 161 /* 162 * Try to reassociate before scanning for a new ap. 163 */ 164 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 165 } else { 166 /* 167 * Somebody else is controlling state changes (e.g. 168 * a user-mode app) don't do anything that would 169 * confuse them; just drop into scan mode so they'll 170 * notified of the state change and given control. 171 */ 172 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 173 } 174 } 175 176 /* 177 * Handle deauth with reason. We retry only for 178 * the cases where we might succeed. Otherwise 179 * we downgrade the ap and scan. 180 */ 181 static void 182 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 183 { 184 switch (reason) { 185 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 186 case IEEE80211_STATUS_TIMEOUT: 187 case IEEE80211_REASON_ASSOC_EXPIRE: 188 case IEEE80211_REASON_NOT_AUTHED: 189 case IEEE80211_REASON_NOT_ASSOCED: 190 case IEEE80211_REASON_ASSOC_LEAVE: 191 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 192 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 193 break; 194 default: 195 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 196 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 197 ieee80211_check_scan_current(vap); 198 break; 199 } 200 } 201 202 /* 203 * IEEE80211_M_STA vap state machine handler. 204 * This routine handles the main states in the 802.11 protocol. 205 */ 206 static int 207 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 208 { 209 struct ieee80211com *ic = vap->iv_ic; 210 struct ieee80211_node *ni; 211 enum ieee80211_state ostate; 212 213 IEEE80211_LOCK_ASSERT(ic); 214 215 ostate = vap->iv_state; 216 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 217 __func__, ieee80211_state_name[ostate], 218 ieee80211_state_name[nstate], arg); 219 vap->iv_state = nstate; /* state transition */ 220 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 221 if (ostate != IEEE80211_S_SCAN) 222 ieee80211_cancel_scan(vap); /* background scan */ 223 ni = vap->iv_bss; /* NB: no reference held */ 224 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 225 callout_stop(&vap->iv_swbmiss); 226 switch (nstate) { 227 case IEEE80211_S_INIT: 228 switch (ostate) { 229 case IEEE80211_S_SLEEP: 230 /* XXX wakeup */ 231 case IEEE80211_S_RUN: 232 IEEE80211_SEND_MGMT(ni, 233 IEEE80211_FC0_SUBTYPE_DISASSOC, 234 IEEE80211_REASON_ASSOC_LEAVE); 235 ieee80211_sta_leave(ni); 236 break; 237 case IEEE80211_S_ASSOC: 238 IEEE80211_SEND_MGMT(ni, 239 IEEE80211_FC0_SUBTYPE_DEAUTH, 240 IEEE80211_REASON_AUTH_LEAVE); 241 break; 242 case IEEE80211_S_SCAN: 243 ieee80211_cancel_scan(vap); 244 break; 245 default: 246 goto invalid; 247 } 248 if (ostate != IEEE80211_S_INIT) { 249 /* NB: optimize INIT -> INIT case */ 250 ieee80211_reset_bss(vap); 251 } 252 if (vap->iv_auth->ia_detach != NULL) 253 vap->iv_auth->ia_detach(vap); 254 break; 255 case IEEE80211_S_SCAN: 256 switch (ostate) { 257 case IEEE80211_S_INIT: 258 /* 259 * Initiate a scan. We can come here as a result 260 * of an IEEE80211_IOC_SCAN_REQ too in which case 261 * the vap will be marked with IEEE80211_FEXT_SCANREQ 262 * and the scan request parameters will be present 263 * in iv_scanreq. Otherwise we do the default. 264 */ 265 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 266 ieee80211_check_scan(vap, 267 vap->iv_scanreq_flags, 268 vap->iv_scanreq_duration, 269 vap->iv_scanreq_mindwell, 270 vap->iv_scanreq_maxdwell, 271 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 272 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 273 } else 274 ieee80211_check_scan_current(vap); 275 break; 276 case IEEE80211_S_SCAN: 277 case IEEE80211_S_AUTH: 278 case IEEE80211_S_ASSOC: 279 /* 280 * These can happen either because of a timeout 281 * on an assoc/auth response or because of a 282 * change in state that requires a reset. For 283 * the former we're called with a non-zero arg 284 * that is the cause for the failure; pass this 285 * to the scan code so it can update state. 286 * Otherwise trigger a new scan unless we're in 287 * manual roaming mode in which case an application 288 * must issue an explicit scan request. 289 */ 290 if (arg != 0) 291 ieee80211_scan_assoc_fail(vap, 292 vap->iv_bss->ni_macaddr, arg); 293 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 294 ieee80211_check_scan_current(vap); 295 break; 296 case IEEE80211_S_RUN: /* beacon miss */ 297 /* 298 * Beacon miss. Notify user space and if not 299 * under control of a user application (roaming 300 * manual) kick off a scan to re-connect. 301 */ 302 ieee80211_sta_leave(ni); 303 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 304 ieee80211_check_scan_current(vap); 305 break; 306 default: 307 goto invalid; 308 } 309 break; 310 case IEEE80211_S_AUTH: 311 switch (ostate) { 312 case IEEE80211_S_INIT: 313 case IEEE80211_S_SCAN: 314 IEEE80211_SEND_MGMT(ni, 315 IEEE80211_FC0_SUBTYPE_AUTH, 1); 316 break; 317 case IEEE80211_S_AUTH: 318 case IEEE80211_S_ASSOC: 319 switch (arg & 0xff) { 320 case IEEE80211_FC0_SUBTYPE_AUTH: 321 /* ??? */ 322 IEEE80211_SEND_MGMT(ni, 323 IEEE80211_FC0_SUBTYPE_AUTH, 2); 324 break; 325 case IEEE80211_FC0_SUBTYPE_DEAUTH: 326 sta_authretry(vap, ni, arg>>8); 327 break; 328 } 329 break; 330 case IEEE80211_S_RUN: 331 switch (arg & 0xff) { 332 case IEEE80211_FC0_SUBTYPE_AUTH: 333 IEEE80211_SEND_MGMT(ni, 334 IEEE80211_FC0_SUBTYPE_AUTH, 2); 335 vap->iv_state = ostate; /* stay RUN */ 336 break; 337 case IEEE80211_FC0_SUBTYPE_DEAUTH: 338 ieee80211_sta_leave(ni); 339 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 340 /* try to reauth */ 341 IEEE80211_SEND_MGMT(ni, 342 IEEE80211_FC0_SUBTYPE_AUTH, 1); 343 } 344 break; 345 } 346 break; 347 default: 348 goto invalid; 349 } 350 break; 351 case IEEE80211_S_ASSOC: 352 switch (ostate) { 353 case IEEE80211_S_AUTH: 354 case IEEE80211_S_ASSOC: 355 IEEE80211_SEND_MGMT(ni, 356 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 357 break; 358 case IEEE80211_S_SLEEP: /* cannot happen */ 359 case IEEE80211_S_RUN: 360 ieee80211_sta_leave(ni); 361 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 362 IEEE80211_SEND_MGMT(ni, arg ? 363 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 364 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 365 } 366 break; 367 default: 368 goto invalid; 369 } 370 break; 371 case IEEE80211_S_RUN: 372 if (vap->iv_flags & IEEE80211_F_WPA) { 373 /* XXX validate prerequisites */ 374 } 375 switch (ostate) { 376 case IEEE80211_S_RUN: 377 case IEEE80211_S_CSA: 378 break; 379 case IEEE80211_S_AUTH: /* when join is done in fw */ 380 case IEEE80211_S_ASSOC: 381 #ifdef IEEE80211_DEBUG 382 if (ieee80211_msg_debug(vap)) { 383 ieee80211_note(vap, "%s with %s ssid ", 384 (vap->iv_opmode == IEEE80211_M_STA ? 385 "associated" : "synchronized"), 386 ether_sprintf(ni->ni_bssid)); 387 ieee80211_print_essid(vap->iv_bss->ni_essid, 388 ni->ni_esslen); 389 /* XXX MCS/HT */ 390 printf(" channel %d start %uMb\n", 391 ieee80211_chan2ieee(ic, ic->ic_curchan), 392 IEEE80211_RATE2MBS(ni->ni_txrate)); 393 } 394 #endif 395 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 396 ieee80211_notify_node_join(ni, 397 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 398 break; 399 case IEEE80211_S_SLEEP: 400 ieee80211_sta_pwrsave(vap, 0); 401 break; 402 default: 403 goto invalid; 404 } 405 ieee80211_sync_curchan(ic); 406 if (ostate != IEEE80211_S_RUN && 407 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 408 /* 409 * Start s/w beacon miss timer for devices w/o 410 * hardware support. We fudge a bit here since 411 * we're doing this in software. 412 */ 413 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 414 2 * vap->iv_bmissthreshold * ni->ni_intval); 415 vap->iv_swbmiss_count = 0; 416 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 417 ieee80211_swbmiss, vap); 418 } 419 /* 420 * When 802.1x is not in use mark the port authorized 421 * at this point so traffic can flow. 422 */ 423 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 424 ieee80211_node_authorize(ni); 425 /* 426 * Fake association when joining an existing bss. 427 */ 428 if (ic->ic_newassoc != NULL) 429 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 430 break; 431 case IEEE80211_S_CSA: 432 if (ostate != IEEE80211_S_RUN) 433 goto invalid; 434 break; 435 case IEEE80211_S_SLEEP: 436 ieee80211_sta_pwrsave(vap, 0); 437 break; 438 default: 439 invalid: 440 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 441 "%s: unexpected state transition %s -> %s\n", __func__, 442 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 443 break; 444 } 445 return 0; 446 } 447 448 /* 449 * Return non-zero if the frame is an echo of a multicast 450 * frame sent by ourself. The dir is known to be DSTODS. 451 */ 452 static __inline int 453 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 454 { 455 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 456 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 457 const uint8_t *sa; 458 459 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 460 461 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 462 return 0; 463 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 464 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 465 #undef WH4 466 #undef QWH4 467 } 468 469 /* 470 * Return non-zero if the frame is an echo of a multicast 471 * frame sent by ourself. The dir is known to be FROMDS. 472 */ 473 static __inline int 474 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 475 { 476 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 477 478 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 479 return 0; 480 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 481 } 482 483 /* 484 * Decide if a received management frame should be 485 * printed when debugging is enabled. This filters some 486 * of the less interesting frames that come frequently 487 * (e.g. beacons). 488 */ 489 static __inline int 490 doprint(struct ieee80211vap *vap, int subtype) 491 { 492 switch (subtype) { 493 case IEEE80211_FC0_SUBTYPE_BEACON: 494 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 495 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 496 return 0; 497 } 498 return 1; 499 } 500 501 /* 502 * Process a received frame. The node associated with the sender 503 * should be supplied. If nothing was found in the node table then 504 * the caller is assumed to supply a reference to iv_bss instead. 505 * The RSSI and a timestamp are also supplied. The RSSI data is used 506 * during AP scanning to select a AP to associate with; it can have 507 * any units so long as values have consistent units and higher values 508 * mean ``better signal''. The receive timestamp is currently not used 509 * by the 802.11 layer. 510 */ 511 static int 512 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 513 { 514 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 515 #define HAS_SEQ(type) ((type & 0x4) == 0) 516 struct ieee80211vap *vap = ni->ni_vap; 517 struct ieee80211com *ic = ni->ni_ic; 518 struct ifnet *ifp = vap->iv_ifp; 519 struct ieee80211_frame *wh; 520 struct ieee80211_key *key; 521 struct ether_header *eh; 522 int hdrspace, need_tap; 523 uint8_t dir, type, subtype, qos; 524 uint8_t *bssid; 525 uint16_t rxseq; 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 need_tap = 1; /* mbuf need to be tapped. */ 548 type = -1; /* undefined */ 549 550 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 551 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 552 ni->ni_macaddr, NULL, 553 "too short (1): len %u", m->m_pkthdr.len); 554 vap->iv_stats.is_rx_tooshort++; 555 goto out; 556 } 557 /* 558 * Bit of a cheat here, we use a pointer for a 3-address 559 * frame format but don't reference fields past outside 560 * ieee80211_frame_min w/o first validating the data is 561 * present. 562 */ 563 wh = mtod(m, struct ieee80211_frame *); 564 565 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 566 IEEE80211_FC0_VERSION_0) { 567 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 568 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 569 wh->i_fc[0], wh->i_fc[1]); 570 vap->iv_stats.is_rx_badversion++; 571 goto err; 572 } 573 574 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 575 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 576 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 577 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 578 bssid = wh->i_addr2; 579 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 580 /* not interested in */ 581 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 582 bssid, NULL, "%s", "not to bss"); 583 vap->iv_stats.is_rx_wrongbss++; 584 goto out; 585 } 586 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 587 ni->ni_noise = nf; 588 if (HAS_SEQ(type)) { 589 uint8_t tid = ieee80211_gettid(wh); 590 if (IEEE80211_QOS_HAS_SEQ(wh) && 591 TID_TO_WME_AC(tid) >= WME_AC_VI) 592 ic->ic_wme.wme_hipri_traffic++; 593 rxseq = le16toh(*(uint16_t *)wh->i_seq); 594 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 595 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 596 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 597 /* duplicate, discard */ 598 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 599 bssid, "duplicate", 600 "seqno <%u,%u> fragno <%u,%u> tid %u", 601 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 602 ni->ni_rxseqs[tid] >> 603 IEEE80211_SEQ_SEQ_SHIFT, 604 rxseq & IEEE80211_SEQ_FRAG_MASK, 605 ni->ni_rxseqs[tid] & 606 IEEE80211_SEQ_FRAG_MASK, 607 tid); 608 vap->iv_stats.is_rx_dup++; 609 IEEE80211_NODE_STAT(ni, rx_dup); 610 goto out; 611 } 612 ni->ni_rxseqs[tid] = rxseq; 613 } 614 } 615 616 switch (type) { 617 case IEEE80211_FC0_TYPE_DATA: 618 hdrspace = ieee80211_hdrspace(ic, wh); 619 if (m->m_len < hdrspace && 620 (m = m_pullup(m, hdrspace)) == NULL) { 621 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 622 ni->ni_macaddr, NULL, 623 "data too short: expecting %u", hdrspace); 624 vap->iv_stats.is_rx_tooshort++; 625 goto out; /* XXX */ 626 } 627 /* 628 * Handle A-MPDU re-ordering. If the frame is to be 629 * processed directly then ieee80211_ampdu_reorder 630 * will return 0; otherwise it has consumed the mbuf 631 * and we should do nothing more with it. 632 */ 633 if ((m->m_flags & M_AMPDU) && 634 (dir == IEEE80211_FC1_DIR_FROMDS || 635 dir == IEEE80211_FC1_DIR_DSTODS) && 636 ieee80211_ampdu_reorder(ni, m) != 0) { 637 m = NULL; 638 goto out; 639 } 640 resubmit_ampdu: 641 if (dir == IEEE80211_FC1_DIR_FROMDS) { 642 if ((ifp->if_flags & IFF_SIMPLEX) && 643 isfromds_mcastecho(vap, wh)) { 644 /* 645 * In IEEE802.11 network, multicast 646 * packets sent from "me" are broadcast 647 * from the AP; silently discard for 648 * SIMPLEX interface. 649 */ 650 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 651 wh, "data", "%s", "multicast echo"); 652 vap->iv_stats.is_rx_mcastecho++; 653 goto out; 654 } 655 if ((vap->iv_flags & IEEE80211_F_DWDS) && 656 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 657 /* 658 * DWDS sta's must drop 3-address mcast frames 659 * as they will be sent separately as a 4-addr 660 * frame. Accepting the 3-addr frame will 661 * confuse the bridge into thinking the sending 662 * sta is located at the end of WDS link. 663 */ 664 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 665 "3-address data", "%s", "DWDS enabled"); 666 vap->iv_stats.is_rx_mcastecho++; 667 goto out; 668 } 669 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 670 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 671 IEEE80211_DISCARD(vap, 672 IEEE80211_MSG_INPUT, wh, "4-address data", 673 "%s", "DWDS not enabled"); 674 vap->iv_stats.is_rx_wrongdir++; 675 goto out; 676 } 677 if ((ifp->if_flags & IFF_SIMPLEX) && 678 isdstods_mcastecho(vap, wh)) { 679 /* 680 * In IEEE802.11 network, multicast 681 * packets sent from "me" are broadcast 682 * from the AP; silently discard for 683 * SIMPLEX interface. 684 */ 685 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 686 "4-address data", "%s", "multicast echo"); 687 vap->iv_stats.is_rx_mcastecho++; 688 goto out; 689 } 690 } else { 691 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 692 "data", "incorrect dir 0x%x", dir); 693 vap->iv_stats.is_rx_wrongdir++; 694 goto out; 695 } 696 697 /* 698 * Handle privacy requirements. Note that we 699 * must not be preempted from here until after 700 * we (potentially) call ieee80211_crypto_demic; 701 * otherwise we may violate assumptions in the 702 * crypto cipher modules used to do delayed update 703 * of replay sequence numbers. 704 */ 705 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 706 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 707 /* 708 * Discard encrypted frames when privacy is off. 709 */ 710 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 711 wh, "WEP", "%s", "PRIVACY off"); 712 vap->iv_stats.is_rx_noprivacy++; 713 IEEE80211_NODE_STAT(ni, rx_noprivacy); 714 goto out; 715 } 716 key = ieee80211_crypto_decap(ni, m, hdrspace); 717 if (key == NULL) { 718 /* NB: stats+msgs handled in crypto_decap */ 719 IEEE80211_NODE_STAT(ni, rx_wepfail); 720 goto out; 721 } 722 wh = mtod(m, struct ieee80211_frame *); 723 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 724 } else { 725 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 726 key = NULL; 727 } 728 729 /* 730 * Save QoS bits for use below--before we strip the header. 731 */ 732 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 733 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 734 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 735 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 736 } else 737 qos = 0; 738 739 /* 740 * Next up, any fragmentation. 741 */ 742 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 743 m = ieee80211_defrag(ni, m, hdrspace); 744 if (m == NULL) { 745 /* Fragment dropped or frame not complete yet */ 746 goto out; 747 } 748 } 749 wh = NULL; /* no longer valid, catch any uses */ 750 751 /* 752 * Next strip any MSDU crypto bits. 753 */ 754 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 755 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 756 ni->ni_macaddr, "data", "%s", "demic error"); 757 vap->iv_stats.is_rx_demicfail++; 758 IEEE80211_NODE_STAT(ni, rx_demicfail); 759 goto out; 760 } 761 762 /* copy to listener after decrypt */ 763 if (ieee80211_radiotap_active_vap(vap)) 764 ieee80211_radiotap_rx(vap, m); 765 need_tap = 0; 766 767 /* 768 * Finally, strip the 802.11 header. 769 */ 770 m = ieee80211_decap(vap, m, hdrspace); 771 if (m == NULL) { 772 /* XXX mask bit to check for both */ 773 /* don't count Null data frames as errors */ 774 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 775 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 776 goto out; 777 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 778 ni->ni_macaddr, "data", "%s", "decap error"); 779 vap->iv_stats.is_rx_decap++; 780 IEEE80211_NODE_STAT(ni, rx_decap); 781 goto err; 782 } 783 eh = mtod(m, struct ether_header *); 784 if (!ieee80211_node_is_authorized(ni)) { 785 /* 786 * Deny any non-PAE frames received prior to 787 * authorization. For open/shared-key 788 * authentication the port is mark authorized 789 * after authentication completes. For 802.1x 790 * the port is not marked authorized by the 791 * authenticator until the handshake has completed. 792 */ 793 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 794 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 795 eh->ether_shost, "data", 796 "unauthorized port: ether type 0x%x len %u", 797 eh->ether_type, m->m_pkthdr.len); 798 vap->iv_stats.is_rx_unauth++; 799 IEEE80211_NODE_STAT(ni, rx_unauth); 800 goto err; 801 } 802 } else { 803 /* 804 * When denying unencrypted frames, discard 805 * any non-PAE frames received without encryption. 806 */ 807 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 808 (key == NULL && (m->m_flags & M_WEP) == 0) && 809 eh->ether_type != htons(ETHERTYPE_PAE)) { 810 /* 811 * Drop unencrypted frames. 812 */ 813 vap->iv_stats.is_rx_unencrypted++; 814 IEEE80211_NODE_STAT(ni, rx_unencrypted); 815 goto out; 816 } 817 } 818 /* XXX require HT? */ 819 if (qos & IEEE80211_QOS_AMSDU) { 820 m = ieee80211_decap_amsdu(ni, m); 821 if (m == NULL) 822 return IEEE80211_FC0_TYPE_DATA; 823 } else { 824 #ifdef IEEE80211_SUPPORT_SUPERG 825 m = ieee80211_decap_fastframe(vap, ni, m); 826 if (m == NULL) 827 return IEEE80211_FC0_TYPE_DATA; 828 #endif 829 } 830 ieee80211_deliver_data(vap, ni, m); 831 return IEEE80211_FC0_TYPE_DATA; 832 833 case IEEE80211_FC0_TYPE_MGT: 834 vap->iv_stats.is_rx_mgmt++; 835 IEEE80211_NODE_STAT(ni, rx_mgmt); 836 if (dir != IEEE80211_FC1_DIR_NODS) { 837 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 838 wh, "data", "incorrect dir 0x%x", dir); 839 vap->iv_stats.is_rx_wrongdir++; 840 goto err; 841 } 842 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 843 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 844 ni->ni_macaddr, "mgt", "too short: len %u", 845 m->m_pkthdr.len); 846 vap->iv_stats.is_rx_tooshort++; 847 goto out; 848 } 849 #ifdef IEEE80211_DEBUG 850 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 851 ieee80211_msg_dumppkts(vap)) { 852 if_printf(ifp, "received %s from %s rssi %d\n", 853 ieee80211_mgt_subtype_name[subtype >> 854 IEEE80211_FC0_SUBTYPE_SHIFT], 855 ether_sprintf(wh->i_addr2), rssi); 856 } 857 #endif 858 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 859 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 860 /* 861 * Only shared key auth frames with a challenge 862 * should be encrypted, discard all others. 863 */ 864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 865 wh, ieee80211_mgt_subtype_name[subtype >> 866 IEEE80211_FC0_SUBTYPE_SHIFT], 867 "%s", "WEP set but not permitted"); 868 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 869 goto out; 870 } 871 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 872 /* 873 * Discard encrypted frames when privacy is off. 874 */ 875 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 876 wh, "mgt", "%s", "WEP set but PRIVACY off"); 877 vap->iv_stats.is_rx_noprivacy++; 878 goto out; 879 } 880 hdrspace = ieee80211_hdrspace(ic, wh); 881 key = ieee80211_crypto_decap(ni, m, hdrspace); 882 if (key == NULL) { 883 /* NB: stats+msgs handled in crypto_decap */ 884 goto out; 885 } 886 wh = mtod(m, struct ieee80211_frame *); 887 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 888 } 889 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 890 goto out; 891 892 case IEEE80211_FC0_TYPE_CTL: 893 vap->iv_stats.is_rx_ctl++; 894 IEEE80211_NODE_STAT(ni, rx_ctrl); 895 vap->iv_recv_ctl(ni, m, subtype); 896 goto out; 897 898 default: 899 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 900 wh, NULL, "bad frame type 0x%x", type); 901 /* should not come here */ 902 break; 903 } 904 err: 905 ifp->if_ierrors++; 906 out: 907 if (m != NULL) { 908 if (need_tap && ieee80211_radiotap_active_vap(vap)) 909 ieee80211_radiotap_rx(vap, m); 910 m_freem(m); 911 } 912 return type; 913 #undef SEQ_LEQ 914 } 915 916 static void 917 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 918 int rssi, int nf, uint16_t seq, uint16_t status) 919 { 920 struct ieee80211vap *vap = ni->ni_vap; 921 922 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 923 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 924 ni->ni_macaddr, "open auth", 925 "bad sta auth mode %u", ni->ni_authmode); 926 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 927 return; 928 } 929 if (vap->iv_state != IEEE80211_S_AUTH || 930 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 931 vap->iv_stats.is_rx_bad_auth++; 932 return; 933 } 934 if (status != 0) { 935 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 936 ni, "open auth failed (reason %d)", status); 937 vap->iv_stats.is_rx_auth_fail++; 938 vap->iv_stats.is_rx_authfail_code = status; 939 ieee80211_new_state(vap, IEEE80211_S_SCAN, 940 IEEE80211_SCAN_FAIL_STATUS); 941 } else 942 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 943 } 944 945 static void 946 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 947 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 948 uint16_t seq, uint16_t status) 949 { 950 struct ieee80211vap *vap = ni->ni_vap; 951 uint8_t *challenge; 952 int estatus; 953 954 /* 955 * NB: this can happen as we allow pre-shared key 956 * authentication to be enabled w/o wep being turned 957 * on so that configuration of these can be done 958 * in any order. It may be better to enforce the 959 * ordering in which case this check would just be 960 * for sanity/consistency. 961 */ 962 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 963 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 964 ni->ni_macaddr, "shared key auth", 965 "%s", " PRIVACY is disabled"); 966 estatus = IEEE80211_STATUS_ALG; 967 goto bad; 968 } 969 /* 970 * Pre-shared key authentication is evil; accept 971 * it only if explicitly configured (it is supported 972 * mainly for compatibility with clients like OS X). 973 */ 974 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 975 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 976 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 977 ni->ni_macaddr, "shared key auth", 978 "bad sta auth mode %u", ni->ni_authmode); 979 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 980 estatus = IEEE80211_STATUS_ALG; 981 goto bad; 982 } 983 984 challenge = NULL; 985 if (frm + 1 < efrm) { 986 if ((frm[1] + 2) > (efrm - frm)) { 987 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 988 ni->ni_macaddr, "shared key auth", 989 "ie %d/%d too long", 990 frm[0], (frm[1] + 2) - (efrm - frm)); 991 vap->iv_stats.is_rx_bad_auth++; 992 estatus = IEEE80211_STATUS_CHALLENGE; 993 goto bad; 994 } 995 if (*frm == IEEE80211_ELEMID_CHALLENGE) 996 challenge = frm; 997 frm += frm[1] + 2; 998 } 999 switch (seq) { 1000 case IEEE80211_AUTH_SHARED_CHALLENGE: 1001 case IEEE80211_AUTH_SHARED_RESPONSE: 1002 if (challenge == NULL) { 1003 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1004 ni->ni_macaddr, "shared key auth", 1005 "%s", "no challenge"); 1006 vap->iv_stats.is_rx_bad_auth++; 1007 estatus = IEEE80211_STATUS_CHALLENGE; 1008 goto bad; 1009 } 1010 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1011 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1012 ni->ni_macaddr, "shared key auth", 1013 "bad challenge len %d", challenge[1]); 1014 vap->iv_stats.is_rx_bad_auth++; 1015 estatus = IEEE80211_STATUS_CHALLENGE; 1016 goto bad; 1017 } 1018 default: 1019 break; 1020 } 1021 if (vap->iv_state != IEEE80211_S_AUTH) 1022 return; 1023 switch (seq) { 1024 case IEEE80211_AUTH_SHARED_PASS: 1025 if (ni->ni_challenge != NULL) { 1026 free(ni->ni_challenge, M_80211_NODE); 1027 ni->ni_challenge = NULL; 1028 } 1029 if (status != 0) { 1030 IEEE80211_NOTE_FRAME(vap, 1031 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1032 "shared key auth failed (reason %d)", status); 1033 vap->iv_stats.is_rx_auth_fail++; 1034 vap->iv_stats.is_rx_authfail_code = status; 1035 return; 1036 } 1037 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1038 break; 1039 case IEEE80211_AUTH_SHARED_CHALLENGE: 1040 if (!ieee80211_alloc_challenge(ni)) 1041 return; 1042 /* XXX could optimize by passing recvd challenge */ 1043 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1044 IEEE80211_SEND_MGMT(ni, 1045 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1046 break; 1047 default: 1048 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1049 wh, "shared key auth", "bad seq %d", seq); 1050 vap->iv_stats.is_rx_bad_auth++; 1051 return; 1052 } 1053 return; 1054 bad: 1055 /* 1056 * Kick the state machine. This short-circuits 1057 * using the mgt frame timeout to trigger the 1058 * state transition. 1059 */ 1060 if (vap->iv_state == IEEE80211_S_AUTH) 1061 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1062 IEEE80211_SCAN_FAIL_STATUS); 1063 } 1064 1065 static int 1066 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1067 const struct ieee80211_frame *wh) 1068 { 1069 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1070 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1071 u_int len = frm[1], qosinfo; 1072 int i; 1073 1074 if (len < sizeof(struct ieee80211_wme_param)-2) { 1075 IEEE80211_DISCARD_IE(vap, 1076 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1077 wh, "WME", "too short, len %u", len); 1078 return -1; 1079 } 1080 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1081 qosinfo &= WME_QOSINFO_COUNT; 1082 /* XXX do proper check for wraparound */ 1083 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1084 return 0; 1085 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1086 for (i = 0; i < WME_NUM_AC; i++) { 1087 struct wmeParams *wmep = 1088 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1089 /* NB: ACI not used */ 1090 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1091 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1092 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1093 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1094 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1095 frm += 4; 1096 } 1097 wme->wme_wmeChanParams.cap_info = qosinfo; 1098 return 1; 1099 #undef MS 1100 } 1101 1102 /* 1103 * Process 11h Channel Switch Announcement (CSA) ie. If this 1104 * is the first CSA then initiate the switch. Otherwise we 1105 * track state and trigger completion and/or cancel of the switch. 1106 * XXX should be public for IBSS use 1107 */ 1108 static void 1109 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1110 const struct ieee80211_frame *wh) 1111 { 1112 struct ieee80211com *ic = vap->iv_ic; 1113 const struct ieee80211_csa_ie *csa = 1114 (const struct ieee80211_csa_ie *) frm; 1115 1116 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1117 ("state %s", ieee80211_state_name[vap->iv_state])); 1118 1119 if (csa->csa_mode > 1) { 1120 IEEE80211_DISCARD_IE(vap, 1121 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1122 wh, "CSA", "invalid mode %u", csa->csa_mode); 1123 return; 1124 } 1125 IEEE80211_LOCK(ic); 1126 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1127 /* 1128 * Convert the channel number to a channel reference. We 1129 * try first to preserve turbo attribute of the current 1130 * channel then fallback. Note this will not work if the 1131 * CSA specifies a channel that requires a band switch (e.g. 1132 * 11a => 11g). This is intentional as 11h is defined only 1133 * for 5GHz/11a and because the switch does not involve a 1134 * reassociation, protocol state (capabilities, negotated 1135 * rates, etc) may/will be wrong. 1136 */ 1137 struct ieee80211_channel *c = 1138 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1139 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1140 if (c == NULL) { 1141 c = ieee80211_find_channel_byieee(ic, 1142 csa->csa_newchan, 1143 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1144 if (c == NULL) { 1145 IEEE80211_DISCARD_IE(vap, 1146 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1147 wh, "CSA", "invalid channel %u", 1148 csa->csa_newchan); 1149 goto done; 1150 } 1151 } 1152 #if IEEE80211_CSA_COUNT_MIN > 0 1153 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1154 /* 1155 * Require at least IEEE80211_CSA_COUNT_MIN count to 1156 * reduce the risk of being redirected by a fabricated 1157 * CSA. If a valid CSA is dropped we'll still get a 1158 * beacon miss when the AP leaves the channel so we'll 1159 * eventually follow to the new channel. 1160 * 1161 * NOTE: this violates the 11h spec that states that 1162 * count may be any value and if 0 then a switch 1163 * should happen asap. 1164 */ 1165 IEEE80211_DISCARD_IE(vap, 1166 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1167 wh, "CSA", "count %u too small, must be >= %u", 1168 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1169 goto done; 1170 } 1171 #endif 1172 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1173 } else { 1174 /* 1175 * Validate this ie against the initial CSA. We require 1176 * mode and channel not change and the count must be 1177 * monotonically decreasing. This may be pointless and 1178 * canceling the switch as a result may be too paranoid but 1179 * in the worst case if we drop out of CSA because of this 1180 * and the AP does move then we'll just end up taking a 1181 * beacon miss and scan to find the AP. 1182 * 1183 * XXX may want <= on count as we also process ProbeResp 1184 * frames and those may come in w/ the same count as the 1185 * previous beacon; but doing so leaves us open to a stuck 1186 * count until we add a dead-man timer 1187 */ 1188 if (!(csa->csa_count < ic->ic_csa_count && 1189 csa->csa_mode == ic->ic_csa_mode && 1190 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1191 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1192 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1193 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1194 ic->ic_csa_newchan, ic->ic_csa_count, 1195 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1196 ieee80211_csa_cancelswitch(ic); 1197 } else { 1198 if (csa->csa_count <= 1) 1199 ieee80211_csa_completeswitch(ic); 1200 else 1201 ic->ic_csa_count = csa->csa_count; 1202 } 1203 } 1204 done: 1205 IEEE80211_UNLOCK(ic); 1206 } 1207 1208 /* 1209 * Return non-zero if a background scan may be continued: 1210 * o bg scan is active 1211 * o no channel switch is pending 1212 * o there has not been any traffic recently 1213 * 1214 * Note we do not check if there is an administrative enable; 1215 * this is only done to start the scan. We assume that any 1216 * change in state will be accompanied by a request to cancel 1217 * active scans which will otherwise cause this test to fail. 1218 */ 1219 static __inline int 1220 contbgscan(struct ieee80211vap *vap) 1221 { 1222 struct ieee80211com *ic = vap->iv_ic; 1223 1224 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1225 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1226 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1227 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1228 } 1229 1230 /* 1231 * Return non-zero if a backgrond scan may be started: 1232 * o bg scanning is administratively enabled 1233 * o no channel switch is pending 1234 * o we are not boosted on a dynamic turbo channel 1235 * o there has not been a scan recently 1236 * o there has not been any traffic recently 1237 */ 1238 static __inline int 1239 startbgscan(struct ieee80211vap *vap) 1240 { 1241 struct ieee80211com *ic = vap->iv_ic; 1242 1243 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1244 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1245 #ifdef IEEE80211_SUPPORT_SUPERG 1246 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1247 #endif 1248 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1249 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1250 } 1251 1252 static void 1253 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1254 int subtype, int rssi, int nf) 1255 { 1256 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1257 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1258 struct ieee80211vap *vap = ni->ni_vap; 1259 struct ieee80211com *ic = ni->ni_ic; 1260 struct ieee80211_frame *wh; 1261 uint8_t *frm, *efrm; 1262 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1263 uint8_t rate; 1264 1265 wh = mtod(m0, struct ieee80211_frame *); 1266 frm = (uint8_t *)&wh[1]; 1267 efrm = mtod(m0, uint8_t *) + m0->m_len; 1268 switch (subtype) { 1269 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1270 case IEEE80211_FC0_SUBTYPE_BEACON: { 1271 struct ieee80211_scanparams scan; 1272 /* 1273 * We process beacon/probe response frames: 1274 * o when scanning, or 1275 * o station mode when associated (to collect state 1276 * updates such as 802.11g slot time) 1277 * Frames otherwise received are discarded. 1278 */ 1279 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1280 vap->iv_stats.is_rx_mgtdiscard++; 1281 return; 1282 } 1283 /* XXX probe response in sta mode when !scanning? */ 1284 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1285 return; 1286 /* 1287 * Count frame now that we know it's to be processed. 1288 */ 1289 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1290 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1291 IEEE80211_NODE_STAT(ni, rx_beacons); 1292 } else 1293 IEEE80211_NODE_STAT(ni, rx_proberesp); 1294 /* 1295 * When operating in station mode, check for state updates. 1296 * Be careful to ignore beacons received while doing a 1297 * background scan. We consider only 11g/WMM stuff right now. 1298 */ 1299 if (ni->ni_associd != 0 && 1300 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1301 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1302 /* record tsf of last beacon */ 1303 memcpy(ni->ni_tstamp.data, scan.tstamp, 1304 sizeof(ni->ni_tstamp)); 1305 /* count beacon frame for s/w bmiss handling */ 1306 vap->iv_swbmiss_count++; 1307 vap->iv_bmiss_count = 0; 1308 if (ni->ni_erp != scan.erp) { 1309 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1310 wh->i_addr2, 1311 "erp change: was 0x%x, now 0x%x", 1312 ni->ni_erp, scan.erp); 1313 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1314 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1315 ic->ic_flags |= IEEE80211_F_USEPROT; 1316 else 1317 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1318 ni->ni_erp = scan.erp; 1319 /* XXX statistic */ 1320 /* XXX driver notification */ 1321 } 1322 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1323 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1324 wh->i_addr2, 1325 "capabilities change: was 0x%x, now 0x%x", 1326 ni->ni_capinfo, scan.capinfo); 1327 /* 1328 * NB: we assume short preamble doesn't 1329 * change dynamically 1330 */ 1331 ieee80211_set_shortslottime(ic, 1332 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1333 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1334 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1335 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1336 /* XXX statistic */ 1337 } 1338 if (scan.wme != NULL && 1339 (ni->ni_flags & IEEE80211_NODE_QOS) && 1340 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1341 ieee80211_wme_updateparams(vap); 1342 #ifdef IEEE80211_SUPPORT_SUPERG 1343 if (scan.ath != NULL) 1344 ieee80211_parse_athparams(ni, scan.ath, wh); 1345 #endif 1346 if (scan.htcap != NULL && scan.htinfo != NULL && 1347 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1348 ieee80211_ht_updateparams(ni, 1349 scan.htcap, scan.htinfo); 1350 /* XXX state changes? */ 1351 } 1352 if (scan.tim != NULL) { 1353 struct ieee80211_tim_ie *tim = 1354 (struct ieee80211_tim_ie *) scan.tim; 1355 #if 0 1356 int aid = IEEE80211_AID(ni->ni_associd); 1357 int ix = aid / NBBY; 1358 int min = tim->tim_bitctl &~ 1; 1359 int max = tim->tim_len + min - 4; 1360 if ((tim->tim_bitctl&1) || 1361 (min <= ix && ix <= max && 1362 isset(tim->tim_bitmap - min, aid))) { 1363 /* 1364 * XXX Do not let bg scan kick off 1365 * we are expecting data. 1366 */ 1367 ic->ic_lastdata = ticks; 1368 ieee80211_sta_pwrsave(vap, 0); 1369 } 1370 #endif 1371 ni->ni_dtim_count = tim->tim_count; 1372 ni->ni_dtim_period = tim->tim_period; 1373 } 1374 if (scan.csa != NULL && 1375 (vap->iv_flags & IEEE80211_F_DOTH)) 1376 ieee80211_parse_csaparams(vap, scan.csa, wh); 1377 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1378 /* 1379 * No CSA ie or 11h disabled, but a channel 1380 * switch is pending; drop out so we aren't 1381 * stuck in CSA state. If the AP really is 1382 * moving we'll get a beacon miss and scan. 1383 */ 1384 IEEE80211_LOCK(ic); 1385 ieee80211_csa_cancelswitch(ic); 1386 IEEE80211_UNLOCK(ic); 1387 } 1388 /* 1389 * If scanning, pass the info to the scan module. 1390 * Otherwise, check if it's the right time to do 1391 * a background scan. Background scanning must 1392 * be enabled and we must not be operating in the 1393 * turbo phase of dynamic turbo mode. Then, 1394 * it's been a while since the last background 1395 * scan and if no data frames have come through 1396 * recently, kick off a scan. Note that this 1397 * is the mechanism by which a background scan 1398 * is started _and_ continued each time we 1399 * return on-channel to receive a beacon from 1400 * our ap. 1401 */ 1402 if (ic->ic_flags & IEEE80211_F_SCAN) { 1403 ieee80211_add_scan(vap, &scan, wh, 1404 subtype, rssi, nf); 1405 } else if (contbgscan(vap)) { 1406 ieee80211_bg_scan(vap, 0); 1407 } else if (startbgscan(vap)) { 1408 vap->iv_stats.is_scan_bg++; 1409 #if 0 1410 /* wakeup if we are sleeing */ 1411 ieee80211_set_pwrsave(vap, 0); 1412 #endif 1413 ieee80211_bg_scan(vap, 0); 1414 } 1415 return; 1416 } 1417 /* 1418 * If scanning, just pass information to the scan module. 1419 */ 1420 if (ic->ic_flags & IEEE80211_F_SCAN) { 1421 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1422 /* 1423 * Actively scanning a channel marked passive; 1424 * send a probe request now that we know there 1425 * is 802.11 traffic present. 1426 * 1427 * XXX check if the beacon we recv'd gives 1428 * us what we need and suppress the probe req 1429 */ 1430 ieee80211_probe_curchan(vap, 1); 1431 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1432 } 1433 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1434 return; 1435 } 1436 break; 1437 } 1438 1439 case IEEE80211_FC0_SUBTYPE_AUTH: { 1440 uint16_t algo, seq, status; 1441 /* 1442 * auth frame format 1443 * [2] algorithm 1444 * [2] sequence 1445 * [2] status 1446 * [tlv*] challenge 1447 */ 1448 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1449 algo = le16toh(*(uint16_t *)frm); 1450 seq = le16toh(*(uint16_t *)(frm + 2)); 1451 status = le16toh(*(uint16_t *)(frm + 4)); 1452 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1453 "recv auth frame with algorithm %d seq %d", algo, seq); 1454 1455 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1456 IEEE80211_DISCARD(vap, 1457 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1458 wh, "auth", "%s", "TKIP countermeasures enabled"); 1459 vap->iv_stats.is_rx_auth_countermeasures++; 1460 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1461 ieee80211_send_error(ni, wh->i_addr2, 1462 IEEE80211_FC0_SUBTYPE_AUTH, 1463 IEEE80211_REASON_MIC_FAILURE); 1464 } 1465 return; 1466 } 1467 if (algo == IEEE80211_AUTH_ALG_SHARED) 1468 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1469 seq, status); 1470 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1471 sta_auth_open(ni, wh, rssi, nf, seq, status); 1472 else { 1473 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1474 wh, "auth", "unsupported alg %d", algo); 1475 vap->iv_stats.is_rx_auth_unsupported++; 1476 return; 1477 } 1478 break; 1479 } 1480 1481 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1482 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1483 uint16_t capinfo, associd; 1484 uint16_t status; 1485 1486 if (vap->iv_state != IEEE80211_S_ASSOC) { 1487 vap->iv_stats.is_rx_mgtdiscard++; 1488 return; 1489 } 1490 1491 /* 1492 * asresp frame format 1493 * [2] capability information 1494 * [2] status 1495 * [2] association ID 1496 * [tlv] supported rates 1497 * [tlv] extended supported rates 1498 * [tlv] WME 1499 * [tlv] HT capabilities 1500 * [tlv] HT info 1501 */ 1502 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1503 ni = vap->iv_bss; 1504 capinfo = le16toh(*(uint16_t *)frm); 1505 frm += 2; 1506 status = le16toh(*(uint16_t *)frm); 1507 frm += 2; 1508 if (status != 0) { 1509 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1510 wh->i_addr2, "%sassoc failed (reason %d)", 1511 ISREASSOC(subtype) ? "re" : "", status); 1512 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1513 return; 1514 } 1515 associd = le16toh(*(uint16_t *)frm); 1516 frm += 2; 1517 1518 rates = xrates = wme = htcap = htinfo = NULL; 1519 while (efrm - frm > 1) { 1520 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1521 switch (*frm) { 1522 case IEEE80211_ELEMID_RATES: 1523 rates = frm; 1524 break; 1525 case IEEE80211_ELEMID_XRATES: 1526 xrates = frm; 1527 break; 1528 case IEEE80211_ELEMID_HTCAP: 1529 htcap = frm; 1530 break; 1531 case IEEE80211_ELEMID_HTINFO: 1532 htinfo = frm; 1533 break; 1534 case IEEE80211_ELEMID_VENDOR: 1535 if (iswmeoui(frm)) 1536 wme = frm; 1537 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1538 /* 1539 * Accept pre-draft HT ie's if the 1540 * standard ones have not been seen. 1541 */ 1542 if (ishtcapoui(frm)) { 1543 if (htcap == NULL) 1544 htcap = frm; 1545 } else if (ishtinfooui(frm)) { 1546 if (htinfo == NULL) 1547 htcap = frm; 1548 } 1549 } 1550 /* XXX Atheros OUI support */ 1551 break; 1552 } 1553 frm += frm[1] + 2; 1554 } 1555 1556 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1557 if (xrates != NULL) 1558 IEEE80211_VERIFY_ELEMENT(xrates, 1559 IEEE80211_RATE_MAXSIZE - rates[1], return); 1560 rate = ieee80211_setup_rates(ni, rates, xrates, 1561 IEEE80211_F_JOIN | 1562 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1563 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1564 if (rate & IEEE80211_RATE_BASIC) { 1565 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1566 wh->i_addr2, 1567 "%sassoc failed (rate set mismatch)", 1568 ISREASSOC(subtype) ? "re" : ""); 1569 vap->iv_stats.is_rx_assoc_norate++; 1570 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1571 IEEE80211_SCAN_FAIL_STATUS); 1572 return; 1573 } 1574 1575 ni->ni_capinfo = capinfo; 1576 ni->ni_associd = associd; 1577 if (ni->ni_jointime == 0) 1578 ni->ni_jointime = time_uptime; 1579 if (wme != NULL && 1580 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1581 ni->ni_flags |= IEEE80211_NODE_QOS; 1582 ieee80211_wme_updateparams(vap); 1583 } else 1584 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1585 /* 1586 * Setup HT state according to the negotiation. 1587 * 1588 * NB: shouldn't need to check if HT use is enabled but some 1589 * ap's send back HT ie's even when we don't indicate we 1590 * are HT capable in our AssocReq. 1591 */ 1592 if (htcap != NULL && htinfo != NULL && 1593 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1594 ieee80211_ht_node_init(ni); 1595 ieee80211_ht_updateparams(ni, htcap, htinfo); 1596 ieee80211_setup_htrates(ni, htcap, 1597 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1598 ieee80211_setup_basic_htrates(ni, htinfo); 1599 ieee80211_node_setuptxparms(ni); 1600 } else { 1601 #ifdef IEEE80211_SUPPORT_SUPERG 1602 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1603 ieee80211_ff_node_init(ni); 1604 #endif 1605 } 1606 /* 1607 * Configure state now that we are associated. 1608 * 1609 * XXX may need different/additional driver callbacks? 1610 */ 1611 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1612 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1613 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1614 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1615 } else { 1616 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1617 ic->ic_flags |= IEEE80211_F_USEBARKER; 1618 } 1619 ieee80211_set_shortslottime(ic, 1620 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1621 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1622 /* 1623 * Honor ERP protection. 1624 * 1625 * NB: ni_erp should zero for non-11g operation. 1626 */ 1627 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1628 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1629 ic->ic_flags |= IEEE80211_F_USEPROT; 1630 else 1631 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1632 IEEE80211_NOTE_MAC(vap, 1633 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1634 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1635 ISREASSOC(subtype) ? "re" : "", 1636 IEEE80211_NODE_AID(ni), 1637 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1638 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1639 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1640 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1641 ni->ni_flags & IEEE80211_NODE_HT ? 1642 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1643 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1644 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1645 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1646 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1647 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1648 ", fast-frames" : "", 1649 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1650 ", turbo" : "" 1651 ); 1652 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1653 break; 1654 } 1655 1656 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1657 uint16_t reason; 1658 1659 if (vap->iv_state == IEEE80211_S_SCAN) { 1660 vap->iv_stats.is_rx_mgtdiscard++; 1661 return; 1662 } 1663 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1664 /* NB: can happen when in promiscuous mode */ 1665 vap->iv_stats.is_rx_mgtdiscard++; 1666 break; 1667 } 1668 1669 /* 1670 * deauth frame format 1671 * [2] reason 1672 */ 1673 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1674 reason = le16toh(*(uint16_t *)frm); 1675 1676 vap->iv_stats.is_rx_deauth++; 1677 vap->iv_stats.is_rx_deauth_code = reason; 1678 IEEE80211_NODE_STAT(ni, rx_deauth); 1679 1680 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1681 "recv deauthenticate (reason %d)", reason); 1682 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1683 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1684 break; 1685 } 1686 1687 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1688 uint16_t reason; 1689 1690 if (vap->iv_state != IEEE80211_S_RUN && 1691 vap->iv_state != IEEE80211_S_ASSOC && 1692 vap->iv_state != IEEE80211_S_AUTH) { 1693 vap->iv_stats.is_rx_mgtdiscard++; 1694 return; 1695 } 1696 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1697 /* NB: can happen when in promiscuous mode */ 1698 vap->iv_stats.is_rx_mgtdiscard++; 1699 break; 1700 } 1701 1702 /* 1703 * disassoc frame format 1704 * [2] reason 1705 */ 1706 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1707 reason = le16toh(*(uint16_t *)frm); 1708 1709 vap->iv_stats.is_rx_disassoc++; 1710 vap->iv_stats.is_rx_disassoc_code = reason; 1711 IEEE80211_NODE_STAT(ni, rx_disassoc); 1712 1713 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1714 "recv disassociate (reason %d)", reason); 1715 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1716 break; 1717 } 1718 1719 case IEEE80211_FC0_SUBTYPE_ACTION: 1720 if (vap->iv_state == IEEE80211_S_RUN) { 1721 if (ieee80211_parse_action(ni, m0) == 0) 1722 ic->ic_recv_action(ni, wh, frm, efrm); 1723 } else 1724 vap->iv_stats.is_rx_mgtdiscard++; 1725 break; 1726 1727 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1728 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1729 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1730 vap->iv_stats.is_rx_mgtdiscard++; 1731 return; 1732 default: 1733 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1734 wh, "mgt", "subtype 0x%x not handled", subtype); 1735 vap->iv_stats.is_rx_badsubtype++; 1736 break; 1737 } 1738 #undef ISREASSOC 1739 #undef ISPROBE 1740 } 1741 1742 static void 1743 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1744 { 1745 }
Cache object: 18fc58c271c6d13e18c152cb7dc24f37
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