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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/9.0/sys/net80211/ieee80211_sta.c 221418 2011-05-04 02:23:59Z adrian $"); 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 #include <net80211/ieee80211_ratectl.h> 64 65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 66 67 static void sta_vattach(struct ieee80211vap *); 68 static void sta_beacon_miss(struct ieee80211vap *); 69 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 71 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 72 int subtype, int rssi, int nf); 73 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 74 75 void 76 ieee80211_sta_attach(struct ieee80211com *ic) 77 { 78 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 79 } 80 81 void 82 ieee80211_sta_detach(struct ieee80211com *ic) 83 { 84 } 85 86 static void 87 sta_vdetach(struct ieee80211vap *vap) 88 { 89 } 90 91 static void 92 sta_vattach(struct ieee80211vap *vap) 93 { 94 vap->iv_newstate = sta_newstate; 95 vap->iv_input = sta_input; 96 vap->iv_recv_mgmt = sta_recv_mgmt; 97 vap->iv_recv_ctl = sta_recv_ctl; 98 vap->iv_opdetach = sta_vdetach; 99 vap->iv_bmiss = sta_beacon_miss; 100 } 101 102 /* 103 * Handle a beacon miss event. The common code filters out 104 * spurious events that can happen when scanning and/or before 105 * reaching RUN state. 106 */ 107 static void 108 sta_beacon_miss(struct ieee80211vap *vap) 109 { 110 struct ieee80211com *ic = vap->iv_ic; 111 112 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 113 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 114 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 115 116 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 117 "beacon miss, mode %s state %s\n", 118 ieee80211_opmode_name[vap->iv_opmode], 119 ieee80211_state_name[vap->iv_state]); 120 121 if (vap->iv_state == IEEE80211_S_CSA) { 122 /* 123 * A Channel Switch is pending; assume we missed the 124 * beacon that would've completed the process and just 125 * force the switch. If we made a mistake we'll not 126 * find the AP on the new channel and fall back to a 127 * normal scan. 128 */ 129 ieee80211_csa_completeswitch(ic); 130 return; 131 } 132 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 133 /* 134 * Send a directed probe req before falling back to a 135 * scan; if we receive a response ic_bmiss_count will 136 * be reset. Some cards mistakenly report beacon miss 137 * so this avoids the expensive scan if the ap is 138 * still there. 139 */ 140 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 141 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 142 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 143 return; 144 } 145 146 callout_stop(&vap->iv_swbmiss); 147 vap->iv_bmiss_count = 0; 148 vap->iv_stats.is_beacon_miss++; 149 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 150 #ifdef IEEE80211_SUPPORT_SUPERG 151 struct ieee80211com *ic = vap->iv_ic; 152 153 /* 154 * If we receive a beacon miss interrupt when using 155 * dynamic turbo, attempt to switch modes before 156 * reassociating. 157 */ 158 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 159 ieee80211_dturbo_switch(vap, 160 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 161 #endif 162 /* 163 * Try to reassociate before scanning for a new ap. 164 */ 165 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 166 } else { 167 /* 168 * Somebody else is controlling state changes (e.g. 169 * a user-mode app) don't do anything that would 170 * confuse them; just drop into scan mode so they'll 171 * notified of the state change and given control. 172 */ 173 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 174 } 175 } 176 177 /* 178 * Handle deauth with reason. We retry only for 179 * the cases where we might succeed. Otherwise 180 * we downgrade the ap and scan. 181 */ 182 static void 183 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 184 { 185 switch (reason) { 186 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 187 case IEEE80211_STATUS_TIMEOUT: 188 case IEEE80211_REASON_ASSOC_EXPIRE: 189 case IEEE80211_REASON_NOT_AUTHED: 190 case IEEE80211_REASON_NOT_ASSOCED: 191 case IEEE80211_REASON_ASSOC_LEAVE: 192 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 193 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 194 break; 195 default: 196 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 197 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 198 ieee80211_check_scan_current(vap); 199 break; 200 } 201 } 202 203 /* 204 * IEEE80211_M_STA vap state machine handler. 205 * This routine handles the main states in the 802.11 protocol. 206 */ 207 static int 208 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 209 { 210 struct ieee80211com *ic = vap->iv_ic; 211 struct ieee80211_node *ni; 212 enum ieee80211_state ostate; 213 214 IEEE80211_LOCK_ASSERT(ic); 215 216 ostate = vap->iv_state; 217 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 218 __func__, ieee80211_state_name[ostate], 219 ieee80211_state_name[nstate], arg); 220 vap->iv_state = nstate; /* state transition */ 221 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 222 if (ostate != IEEE80211_S_SCAN) 223 ieee80211_cancel_scan(vap); /* background scan */ 224 ni = vap->iv_bss; /* NB: no reference held */ 225 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 226 callout_stop(&vap->iv_swbmiss); 227 switch (nstate) { 228 case IEEE80211_S_INIT: 229 switch (ostate) { 230 case IEEE80211_S_SLEEP: 231 /* XXX wakeup */ 232 case IEEE80211_S_RUN: 233 IEEE80211_SEND_MGMT(ni, 234 IEEE80211_FC0_SUBTYPE_DISASSOC, 235 IEEE80211_REASON_ASSOC_LEAVE); 236 ieee80211_sta_leave(ni); 237 break; 238 case IEEE80211_S_ASSOC: 239 IEEE80211_SEND_MGMT(ni, 240 IEEE80211_FC0_SUBTYPE_DEAUTH, 241 IEEE80211_REASON_AUTH_LEAVE); 242 break; 243 case IEEE80211_S_SCAN: 244 ieee80211_cancel_scan(vap); 245 break; 246 default: 247 goto invalid; 248 } 249 if (ostate != IEEE80211_S_INIT) { 250 /* NB: optimize INIT -> INIT case */ 251 ieee80211_reset_bss(vap); 252 } 253 if (vap->iv_auth->ia_detach != NULL) 254 vap->iv_auth->ia_detach(vap); 255 break; 256 case IEEE80211_S_SCAN: 257 switch (ostate) { 258 case IEEE80211_S_INIT: 259 /* 260 * Initiate a scan. We can come here as a result 261 * of an IEEE80211_IOC_SCAN_REQ too in which case 262 * the vap will be marked with IEEE80211_FEXT_SCANREQ 263 * and the scan request parameters will be present 264 * in iv_scanreq. Otherwise we do the default. 265 */ 266 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 267 ieee80211_check_scan(vap, 268 vap->iv_scanreq_flags, 269 vap->iv_scanreq_duration, 270 vap->iv_scanreq_mindwell, 271 vap->iv_scanreq_maxdwell, 272 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 273 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 274 } else 275 ieee80211_check_scan_current(vap); 276 break; 277 case IEEE80211_S_SCAN: 278 case IEEE80211_S_AUTH: 279 case IEEE80211_S_ASSOC: 280 /* 281 * These can happen either because of a timeout 282 * on an assoc/auth response or because of a 283 * change in state that requires a reset. For 284 * the former we're called with a non-zero arg 285 * that is the cause for the failure; pass this 286 * to the scan code so it can update state. 287 * Otherwise trigger a new scan unless we're in 288 * manual roaming mode in which case an application 289 * must issue an explicit scan request. 290 */ 291 if (arg != 0) 292 ieee80211_scan_assoc_fail(vap, 293 vap->iv_bss->ni_macaddr, arg); 294 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 295 ieee80211_check_scan_current(vap); 296 break; 297 case IEEE80211_S_RUN: /* beacon miss */ 298 /* 299 * Beacon miss. Notify user space and if not 300 * under control of a user application (roaming 301 * manual) kick off a scan to re-connect. 302 */ 303 ieee80211_sta_leave(ni); 304 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 305 ieee80211_check_scan_current(vap); 306 break; 307 default: 308 goto invalid; 309 } 310 break; 311 case IEEE80211_S_AUTH: 312 switch (ostate) { 313 case IEEE80211_S_INIT: 314 case IEEE80211_S_SCAN: 315 IEEE80211_SEND_MGMT(ni, 316 IEEE80211_FC0_SUBTYPE_AUTH, 1); 317 break; 318 case IEEE80211_S_AUTH: 319 case IEEE80211_S_ASSOC: 320 switch (arg & 0xff) { 321 case IEEE80211_FC0_SUBTYPE_AUTH: 322 /* ??? */ 323 IEEE80211_SEND_MGMT(ni, 324 IEEE80211_FC0_SUBTYPE_AUTH, 2); 325 break; 326 case IEEE80211_FC0_SUBTYPE_DEAUTH: 327 sta_authretry(vap, ni, arg>>8); 328 break; 329 } 330 break; 331 case IEEE80211_S_RUN: 332 switch (arg & 0xff) { 333 case IEEE80211_FC0_SUBTYPE_AUTH: 334 IEEE80211_SEND_MGMT(ni, 335 IEEE80211_FC0_SUBTYPE_AUTH, 2); 336 vap->iv_state = ostate; /* stay RUN */ 337 break; 338 case IEEE80211_FC0_SUBTYPE_DEAUTH: 339 ieee80211_sta_leave(ni); 340 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 341 /* try to reauth */ 342 IEEE80211_SEND_MGMT(ni, 343 IEEE80211_FC0_SUBTYPE_AUTH, 1); 344 } 345 break; 346 } 347 break; 348 default: 349 goto invalid; 350 } 351 break; 352 case IEEE80211_S_ASSOC: 353 switch (ostate) { 354 case IEEE80211_S_AUTH: 355 case IEEE80211_S_ASSOC: 356 IEEE80211_SEND_MGMT(ni, 357 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 358 break; 359 case IEEE80211_S_SLEEP: /* cannot happen */ 360 case IEEE80211_S_RUN: 361 ieee80211_sta_leave(ni); 362 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 363 IEEE80211_SEND_MGMT(ni, arg ? 364 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 365 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 366 } 367 break; 368 default: 369 goto invalid; 370 } 371 break; 372 case IEEE80211_S_RUN: 373 if (vap->iv_flags & IEEE80211_F_WPA) { 374 /* XXX validate prerequisites */ 375 } 376 switch (ostate) { 377 case IEEE80211_S_RUN: 378 case IEEE80211_S_CSA: 379 break; 380 case IEEE80211_S_AUTH: /* when join is done in fw */ 381 case IEEE80211_S_ASSOC: 382 #ifdef IEEE80211_DEBUG 383 if (ieee80211_msg_debug(vap)) { 384 ieee80211_note(vap, "%s with %s ssid ", 385 (vap->iv_opmode == IEEE80211_M_STA ? 386 "associated" : "synchronized"), 387 ether_sprintf(ni->ni_bssid)); 388 ieee80211_print_essid(vap->iv_bss->ni_essid, 389 ni->ni_esslen); 390 /* XXX MCS/HT */ 391 printf(" channel %d start %uMb\n", 392 ieee80211_chan2ieee(ic, ic->ic_curchan), 393 IEEE80211_RATE2MBS(ni->ni_txrate)); 394 } 395 #endif 396 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 397 ieee80211_notify_node_join(ni, 398 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 399 break; 400 case IEEE80211_S_SLEEP: 401 ieee80211_sta_pwrsave(vap, 0); 402 break; 403 default: 404 goto invalid; 405 } 406 ieee80211_sync_curchan(ic); 407 if (ostate != IEEE80211_S_RUN && 408 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 409 /* 410 * Start s/w beacon miss timer for devices w/o 411 * hardware support. We fudge a bit here since 412 * we're doing this in software. 413 */ 414 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 415 2 * vap->iv_bmissthreshold * ni->ni_intval); 416 vap->iv_swbmiss_count = 0; 417 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 418 ieee80211_swbmiss, vap); 419 } 420 /* 421 * When 802.1x is not in use mark the port authorized 422 * at this point so traffic can flow. 423 */ 424 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 425 ieee80211_node_authorize(ni); 426 /* 427 * Fake association when joining an existing bss. 428 */ 429 if (ic->ic_newassoc != NULL) 430 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 431 break; 432 case IEEE80211_S_CSA: 433 if (ostate != IEEE80211_S_RUN) 434 goto invalid; 435 break; 436 case IEEE80211_S_SLEEP: 437 ieee80211_sta_pwrsave(vap, 1); 438 break; 439 default: 440 invalid: 441 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 442 "%s: unexpected state transition %s -> %s\n", __func__, 443 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 444 break; 445 } 446 return 0; 447 } 448 449 /* 450 * Return non-zero if the frame is an echo of a multicast 451 * frame sent by ourself. The dir is known to be DSTODS. 452 */ 453 static __inline int 454 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 455 { 456 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 457 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 458 const uint8_t *sa; 459 460 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 461 462 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 463 return 0; 464 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 465 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 466 #undef WH4 467 #undef QWH4 468 } 469 470 /* 471 * Return non-zero if the frame is an echo of a multicast 472 * frame sent by ourself. The dir is known to be FROMDS. 473 */ 474 static __inline int 475 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 476 { 477 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 478 479 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 480 return 0; 481 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 482 } 483 484 /* 485 * Decide if a received management frame should be 486 * printed when debugging is enabled. This filters some 487 * of the less interesting frames that come frequently 488 * (e.g. beacons). 489 */ 490 static __inline int 491 doprint(struct ieee80211vap *vap, int subtype) 492 { 493 switch (subtype) { 494 case IEEE80211_FC0_SUBTYPE_BEACON: 495 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 496 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 497 return 0; 498 } 499 return 1; 500 } 501 502 /* 503 * Process a received frame. The node associated with the sender 504 * should be supplied. If nothing was found in the node table then 505 * the caller is assumed to supply a reference to iv_bss instead. 506 * The RSSI and a timestamp are also supplied. The RSSI data is used 507 * during AP scanning to select a AP to associate with; it can have 508 * any units so long as values have consistent units and higher values 509 * mean ``better signal''. The receive timestamp is currently not used 510 * by the 802.11 layer. 511 */ 512 static int 513 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 514 { 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 = 1; /* mbuf need to be tapped. */ 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 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 (! ieee80211_check_rxseq(ni, wh)) { 594 /* duplicate, discard */ 595 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 596 bssid, "duplicate", 597 "seqno <%u,%u> fragno <%u,%u> tid %u", 598 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 599 ni->ni_rxseqs[tid] >> 600 IEEE80211_SEQ_SEQ_SHIFT, 601 rxseq & IEEE80211_SEQ_FRAG_MASK, 602 ni->ni_rxseqs[tid] & 603 IEEE80211_SEQ_FRAG_MASK, 604 tid); 605 vap->iv_stats.is_rx_dup++; 606 IEEE80211_NODE_STAT(ni, rx_dup); 607 goto out; 608 } 609 ni->ni_rxseqs[tid] = rxseq; 610 } 611 } 612 613 switch (type) { 614 case IEEE80211_FC0_TYPE_DATA: 615 hdrspace = ieee80211_hdrspace(ic, wh); 616 if (m->m_len < hdrspace && 617 (m = m_pullup(m, hdrspace)) == NULL) { 618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 619 ni->ni_macaddr, NULL, 620 "data too short: expecting %u", hdrspace); 621 vap->iv_stats.is_rx_tooshort++; 622 goto out; /* XXX */ 623 } 624 /* 625 * Handle A-MPDU re-ordering. If the frame is to be 626 * processed directly then ieee80211_ampdu_reorder 627 * will return 0; otherwise it has consumed the mbuf 628 * and we should do nothing more with it. 629 */ 630 if ((m->m_flags & M_AMPDU) && 631 (dir == IEEE80211_FC1_DIR_FROMDS || 632 dir == IEEE80211_FC1_DIR_DSTODS) && 633 ieee80211_ampdu_reorder(ni, m) != 0) { 634 m = NULL; 635 goto out; 636 } 637 resubmit_ampdu: 638 if (dir == IEEE80211_FC1_DIR_FROMDS) { 639 if ((ifp->if_flags & IFF_SIMPLEX) && 640 isfromds_mcastecho(vap, wh)) { 641 /* 642 * In IEEE802.11 network, multicast 643 * packets sent from "me" are broadcast 644 * from the AP; silently discard for 645 * SIMPLEX interface. 646 */ 647 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 648 wh, "data", "%s", "multicast echo"); 649 vap->iv_stats.is_rx_mcastecho++; 650 goto out; 651 } 652 if ((vap->iv_flags & IEEE80211_F_DWDS) && 653 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 654 /* 655 * DWDS sta's must drop 3-address mcast frames 656 * as they will be sent separately as a 4-addr 657 * frame. Accepting the 3-addr frame will 658 * confuse the bridge into thinking the sending 659 * sta is located at the end of WDS link. 660 */ 661 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 662 "3-address data", "%s", "DWDS enabled"); 663 vap->iv_stats.is_rx_mcastecho++; 664 goto out; 665 } 666 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 667 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 668 IEEE80211_DISCARD(vap, 669 IEEE80211_MSG_INPUT, wh, "4-address data", 670 "%s", "DWDS not enabled"); 671 vap->iv_stats.is_rx_wrongdir++; 672 goto out; 673 } 674 if ((ifp->if_flags & IFF_SIMPLEX) && 675 isdstods_mcastecho(vap, wh)) { 676 /* 677 * In IEEE802.11 network, multicast 678 * packets sent from "me" are broadcast 679 * from the AP; silently discard for 680 * SIMPLEX interface. 681 */ 682 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 683 "4-address data", "%s", "multicast echo"); 684 vap->iv_stats.is_rx_mcastecho++; 685 goto out; 686 } 687 } else { 688 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 689 "data", "incorrect dir 0x%x", dir); 690 vap->iv_stats.is_rx_wrongdir++; 691 goto out; 692 } 693 694 /* 695 * Handle privacy requirements. Note that we 696 * must not be preempted from here until after 697 * we (potentially) call ieee80211_crypto_demic; 698 * otherwise we may violate assumptions in the 699 * crypto cipher modules used to do delayed update 700 * of replay sequence numbers. 701 */ 702 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 703 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 704 /* 705 * Discard encrypted frames when privacy is off. 706 */ 707 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 708 wh, "WEP", "%s", "PRIVACY off"); 709 vap->iv_stats.is_rx_noprivacy++; 710 IEEE80211_NODE_STAT(ni, rx_noprivacy); 711 goto out; 712 } 713 key = ieee80211_crypto_decap(ni, m, hdrspace); 714 if (key == NULL) { 715 /* NB: stats+msgs handled in crypto_decap */ 716 IEEE80211_NODE_STAT(ni, rx_wepfail); 717 goto out; 718 } 719 wh = mtod(m, struct ieee80211_frame *); 720 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 721 } else { 722 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 723 key = NULL; 724 } 725 726 /* 727 * Save QoS bits for use below--before we strip the header. 728 */ 729 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 730 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 731 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 732 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 733 } else 734 qos = 0; 735 736 /* 737 * Next up, any fragmentation. 738 */ 739 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 740 m = ieee80211_defrag(ni, m, hdrspace); 741 if (m == NULL) { 742 /* Fragment dropped or frame not complete yet */ 743 goto out; 744 } 745 } 746 wh = NULL; /* no longer valid, catch any uses */ 747 748 /* 749 * Next strip any MSDU crypto bits. 750 */ 751 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 752 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 753 ni->ni_macaddr, "data", "%s", "demic error"); 754 vap->iv_stats.is_rx_demicfail++; 755 IEEE80211_NODE_STAT(ni, rx_demicfail); 756 goto out; 757 } 758 759 /* copy to listener after decrypt */ 760 if (ieee80211_radiotap_active_vap(vap)) 761 ieee80211_radiotap_rx(vap, m); 762 need_tap = 0; 763 764 /* 765 * Finally, strip the 802.11 header. 766 */ 767 m = ieee80211_decap(vap, m, hdrspace); 768 if (m == NULL) { 769 /* XXX mask bit to check for both */ 770 /* don't count Null data frames as errors */ 771 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 772 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 773 goto out; 774 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 775 ni->ni_macaddr, "data", "%s", "decap error"); 776 vap->iv_stats.is_rx_decap++; 777 IEEE80211_NODE_STAT(ni, rx_decap); 778 goto err; 779 } 780 eh = mtod(m, struct ether_header *); 781 if (!ieee80211_node_is_authorized(ni)) { 782 /* 783 * Deny any non-PAE frames received prior to 784 * authorization. For open/shared-key 785 * authentication the port is mark authorized 786 * after authentication completes. For 802.1x 787 * the port is not marked authorized by the 788 * authenticator until the handshake has completed. 789 */ 790 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 791 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 792 eh->ether_shost, "data", 793 "unauthorized port: ether type 0x%x len %u", 794 eh->ether_type, m->m_pkthdr.len); 795 vap->iv_stats.is_rx_unauth++; 796 IEEE80211_NODE_STAT(ni, rx_unauth); 797 goto err; 798 } 799 } else { 800 /* 801 * When denying unencrypted frames, discard 802 * any non-PAE frames received without encryption. 803 */ 804 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 805 (key == NULL && (m->m_flags & M_WEP) == 0) && 806 eh->ether_type != htons(ETHERTYPE_PAE)) { 807 /* 808 * Drop unencrypted frames. 809 */ 810 vap->iv_stats.is_rx_unencrypted++; 811 IEEE80211_NODE_STAT(ni, rx_unencrypted); 812 goto out; 813 } 814 } 815 /* XXX require HT? */ 816 if (qos & IEEE80211_QOS_AMSDU) { 817 m = ieee80211_decap_amsdu(ni, m); 818 if (m == NULL) 819 return IEEE80211_FC0_TYPE_DATA; 820 } else { 821 #ifdef IEEE80211_SUPPORT_SUPERG 822 m = ieee80211_decap_fastframe(vap, ni, m); 823 if (m == NULL) 824 return IEEE80211_FC0_TYPE_DATA; 825 #endif 826 } 827 ieee80211_deliver_data(vap, ni, m); 828 return IEEE80211_FC0_TYPE_DATA; 829 830 case IEEE80211_FC0_TYPE_MGT: 831 vap->iv_stats.is_rx_mgmt++; 832 IEEE80211_NODE_STAT(ni, rx_mgmt); 833 if (dir != IEEE80211_FC1_DIR_NODS) { 834 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 835 wh, "data", "incorrect dir 0x%x", dir); 836 vap->iv_stats.is_rx_wrongdir++; 837 goto err; 838 } 839 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 840 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 841 ni->ni_macaddr, "mgt", "too short: len %u", 842 m->m_pkthdr.len); 843 vap->iv_stats.is_rx_tooshort++; 844 goto out; 845 } 846 #ifdef IEEE80211_DEBUG 847 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 848 ieee80211_msg_dumppkts(vap)) { 849 if_printf(ifp, "received %s from %s rssi %d\n", 850 ieee80211_mgt_subtype_name[subtype >> 851 IEEE80211_FC0_SUBTYPE_SHIFT], 852 ether_sprintf(wh->i_addr2), rssi); 853 } 854 #endif 855 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 856 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 857 /* 858 * Only shared key auth frames with a challenge 859 * should be encrypted, discard all others. 860 */ 861 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 862 wh, ieee80211_mgt_subtype_name[subtype >> 863 IEEE80211_FC0_SUBTYPE_SHIFT], 864 "%s", "WEP set but not permitted"); 865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 866 goto out; 867 } 868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 869 /* 870 * Discard encrypted frames when privacy is off. 871 */ 872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 873 wh, "mgt", "%s", "WEP set but PRIVACY off"); 874 vap->iv_stats.is_rx_noprivacy++; 875 goto out; 876 } 877 hdrspace = ieee80211_hdrspace(ic, wh); 878 key = ieee80211_crypto_decap(ni, m, hdrspace); 879 if (key == NULL) { 880 /* NB: stats+msgs handled in crypto_decap */ 881 goto out; 882 } 883 wh = mtod(m, struct ieee80211_frame *); 884 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 885 } 886 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 887 goto out; 888 889 case IEEE80211_FC0_TYPE_CTL: 890 vap->iv_stats.is_rx_ctl++; 891 IEEE80211_NODE_STAT(ni, rx_ctrl); 892 vap->iv_recv_ctl(ni, m, subtype); 893 goto out; 894 895 default: 896 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 897 wh, NULL, "bad frame type 0x%x", type); 898 /* should not come here */ 899 break; 900 } 901 err: 902 ifp->if_ierrors++; 903 out: 904 if (m != NULL) { 905 if (need_tap && ieee80211_radiotap_active_vap(vap)) 906 ieee80211_radiotap_rx(vap, m); 907 m_freem(m); 908 } 909 return type; 910 } 911 912 static void 913 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 914 int rssi, int nf, uint16_t seq, uint16_t status) 915 { 916 struct ieee80211vap *vap = ni->ni_vap; 917 918 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 919 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 920 ni->ni_macaddr, "open auth", 921 "bad sta auth mode %u", ni->ni_authmode); 922 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 923 return; 924 } 925 if (vap->iv_state != IEEE80211_S_AUTH || 926 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 927 vap->iv_stats.is_rx_bad_auth++; 928 return; 929 } 930 if (status != 0) { 931 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 932 ni, "open auth failed (reason %d)", status); 933 vap->iv_stats.is_rx_auth_fail++; 934 vap->iv_stats.is_rx_authfail_code = status; 935 ieee80211_new_state(vap, IEEE80211_S_SCAN, 936 IEEE80211_SCAN_FAIL_STATUS); 937 } else 938 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 939 } 940 941 static void 942 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 943 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 944 uint16_t seq, uint16_t status) 945 { 946 struct ieee80211vap *vap = ni->ni_vap; 947 uint8_t *challenge; 948 int estatus; 949 950 /* 951 * NB: this can happen as we allow pre-shared key 952 * authentication to be enabled w/o wep being turned 953 * on so that configuration of these can be done 954 * in any order. It may be better to enforce the 955 * ordering in which case this check would just be 956 * for sanity/consistency. 957 */ 958 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 960 ni->ni_macaddr, "shared key auth", 961 "%s", " PRIVACY is disabled"); 962 estatus = IEEE80211_STATUS_ALG; 963 goto bad; 964 } 965 /* 966 * Pre-shared key authentication is evil; accept 967 * it only if explicitly configured (it is supported 968 * mainly for compatibility with clients like OS X). 969 */ 970 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 971 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 972 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 973 ni->ni_macaddr, "shared key auth", 974 "bad sta auth mode %u", ni->ni_authmode); 975 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 976 estatus = IEEE80211_STATUS_ALG; 977 goto bad; 978 } 979 980 challenge = NULL; 981 if (frm + 1 < efrm) { 982 if ((frm[1] + 2) > (efrm - frm)) { 983 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 984 ni->ni_macaddr, "shared key auth", 985 "ie %d/%d too long", 986 frm[0], (frm[1] + 2) - (efrm - frm)); 987 vap->iv_stats.is_rx_bad_auth++; 988 estatus = IEEE80211_STATUS_CHALLENGE; 989 goto bad; 990 } 991 if (*frm == IEEE80211_ELEMID_CHALLENGE) 992 challenge = frm; 993 frm += frm[1] + 2; 994 } 995 switch (seq) { 996 case IEEE80211_AUTH_SHARED_CHALLENGE: 997 case IEEE80211_AUTH_SHARED_RESPONSE: 998 if (challenge == NULL) { 999 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1000 ni->ni_macaddr, "shared key auth", 1001 "%s", "no challenge"); 1002 vap->iv_stats.is_rx_bad_auth++; 1003 estatus = IEEE80211_STATUS_CHALLENGE; 1004 goto bad; 1005 } 1006 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1007 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1008 ni->ni_macaddr, "shared key auth", 1009 "bad challenge len %d", challenge[1]); 1010 vap->iv_stats.is_rx_bad_auth++; 1011 estatus = IEEE80211_STATUS_CHALLENGE; 1012 goto bad; 1013 } 1014 default: 1015 break; 1016 } 1017 if (vap->iv_state != IEEE80211_S_AUTH) 1018 return; 1019 switch (seq) { 1020 case IEEE80211_AUTH_SHARED_PASS: 1021 if (ni->ni_challenge != NULL) { 1022 free(ni->ni_challenge, M_80211_NODE); 1023 ni->ni_challenge = NULL; 1024 } 1025 if (status != 0) { 1026 IEEE80211_NOTE_FRAME(vap, 1027 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1028 "shared key auth failed (reason %d)", status); 1029 vap->iv_stats.is_rx_auth_fail++; 1030 vap->iv_stats.is_rx_authfail_code = status; 1031 return; 1032 } 1033 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1034 break; 1035 case IEEE80211_AUTH_SHARED_CHALLENGE: 1036 if (!ieee80211_alloc_challenge(ni)) 1037 return; 1038 /* XXX could optimize by passing recvd challenge */ 1039 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1040 IEEE80211_SEND_MGMT(ni, 1041 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1042 break; 1043 default: 1044 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1045 wh, "shared key auth", "bad seq %d", seq); 1046 vap->iv_stats.is_rx_bad_auth++; 1047 return; 1048 } 1049 return; 1050 bad: 1051 /* 1052 * Kick the state machine. This short-circuits 1053 * using the mgt frame timeout to trigger the 1054 * state transition. 1055 */ 1056 if (vap->iv_state == IEEE80211_S_AUTH) 1057 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1058 IEEE80211_SCAN_FAIL_STATUS); 1059 } 1060 1061 static int 1062 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1063 const struct ieee80211_frame *wh) 1064 { 1065 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1066 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1067 u_int len = frm[1], qosinfo; 1068 int i; 1069 1070 if (len < sizeof(struct ieee80211_wme_param)-2) { 1071 IEEE80211_DISCARD_IE(vap, 1072 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1073 wh, "WME", "too short, len %u", len); 1074 return -1; 1075 } 1076 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1077 qosinfo &= WME_QOSINFO_COUNT; 1078 /* XXX do proper check for wraparound */ 1079 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1080 return 0; 1081 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1082 for (i = 0; i < WME_NUM_AC; i++) { 1083 struct wmeParams *wmep = 1084 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1085 /* NB: ACI not used */ 1086 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1087 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1088 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1089 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1090 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1091 frm += 4; 1092 } 1093 wme->wme_wmeChanParams.cap_info = qosinfo; 1094 return 1; 1095 #undef MS 1096 } 1097 1098 /* 1099 * Process 11h Channel Switch Announcement (CSA) ie. If this 1100 * is the first CSA then initiate the switch. Otherwise we 1101 * track state and trigger completion and/or cancel of the switch. 1102 * XXX should be public for IBSS use 1103 */ 1104 static void 1105 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1106 const struct ieee80211_frame *wh) 1107 { 1108 struct ieee80211com *ic = vap->iv_ic; 1109 const struct ieee80211_csa_ie *csa = 1110 (const struct ieee80211_csa_ie *) frm; 1111 1112 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1113 ("state %s", ieee80211_state_name[vap->iv_state])); 1114 1115 if (csa->csa_mode > 1) { 1116 IEEE80211_DISCARD_IE(vap, 1117 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1118 wh, "CSA", "invalid mode %u", csa->csa_mode); 1119 return; 1120 } 1121 IEEE80211_LOCK(ic); 1122 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1123 /* 1124 * Convert the channel number to a channel reference. We 1125 * try first to preserve turbo attribute of the current 1126 * channel then fallback. Note this will not work if the 1127 * CSA specifies a channel that requires a band switch (e.g. 1128 * 11a => 11g). This is intentional as 11h is defined only 1129 * for 5GHz/11a and because the switch does not involve a 1130 * reassociation, protocol state (capabilities, negotated 1131 * rates, etc) may/will be wrong. 1132 */ 1133 struct ieee80211_channel *c = 1134 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1135 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1136 if (c == NULL) { 1137 c = ieee80211_find_channel_byieee(ic, 1138 csa->csa_newchan, 1139 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1140 if (c == NULL) { 1141 IEEE80211_DISCARD_IE(vap, 1142 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1143 wh, "CSA", "invalid channel %u", 1144 csa->csa_newchan); 1145 goto done; 1146 } 1147 } 1148 #if IEEE80211_CSA_COUNT_MIN > 0 1149 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1150 /* 1151 * Require at least IEEE80211_CSA_COUNT_MIN count to 1152 * reduce the risk of being redirected by a fabricated 1153 * CSA. If a valid CSA is dropped we'll still get a 1154 * beacon miss when the AP leaves the channel so we'll 1155 * eventually follow to the new channel. 1156 * 1157 * NOTE: this violates the 11h spec that states that 1158 * count may be any value and if 0 then a switch 1159 * should happen asap. 1160 */ 1161 IEEE80211_DISCARD_IE(vap, 1162 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1163 wh, "CSA", "count %u too small, must be >= %u", 1164 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1165 goto done; 1166 } 1167 #endif 1168 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1169 } else { 1170 /* 1171 * Validate this ie against the initial CSA. We require 1172 * mode and channel not change and the count must be 1173 * monotonically decreasing. This may be pointless and 1174 * canceling the switch as a result may be too paranoid but 1175 * in the worst case if we drop out of CSA because of this 1176 * and the AP does move then we'll just end up taking a 1177 * beacon miss and scan to find the AP. 1178 * 1179 * XXX may want <= on count as we also process ProbeResp 1180 * frames and those may come in w/ the same count as the 1181 * previous beacon; but doing so leaves us open to a stuck 1182 * count until we add a dead-man timer 1183 */ 1184 if (!(csa->csa_count < ic->ic_csa_count && 1185 csa->csa_mode == ic->ic_csa_mode && 1186 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1187 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1188 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1189 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1190 ic->ic_csa_newchan, ic->ic_csa_count, 1191 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1192 ieee80211_csa_cancelswitch(ic); 1193 } else { 1194 if (csa->csa_count <= 1) 1195 ieee80211_csa_completeswitch(ic); 1196 else 1197 ic->ic_csa_count = csa->csa_count; 1198 } 1199 } 1200 done: 1201 IEEE80211_UNLOCK(ic); 1202 } 1203 1204 /* 1205 * Return non-zero if a background scan may be continued: 1206 * o bg scan is active 1207 * o no channel switch is pending 1208 * o there has not been any traffic recently 1209 * 1210 * Note we do not check if there is an administrative enable; 1211 * this is only done to start the scan. We assume that any 1212 * change in state will be accompanied by a request to cancel 1213 * active scans which will otherwise cause this test to fail. 1214 */ 1215 static __inline int 1216 contbgscan(struct ieee80211vap *vap) 1217 { 1218 struct ieee80211com *ic = vap->iv_ic; 1219 1220 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1221 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1222 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1223 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1224 } 1225 1226 /* 1227 * Return non-zero if a backgrond scan may be started: 1228 * o bg scanning is administratively enabled 1229 * o no channel switch is pending 1230 * o we are not boosted on a dynamic turbo channel 1231 * o there has not been a scan recently 1232 * o there has not been any traffic recently 1233 */ 1234 static __inline int 1235 startbgscan(struct ieee80211vap *vap) 1236 { 1237 struct ieee80211com *ic = vap->iv_ic; 1238 1239 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1240 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1241 #ifdef IEEE80211_SUPPORT_SUPERG 1242 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1243 #endif 1244 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1245 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1246 } 1247 1248 static void 1249 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1250 int subtype, int rssi, int nf) 1251 { 1252 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1253 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1254 struct ieee80211vap *vap = ni->ni_vap; 1255 struct ieee80211com *ic = ni->ni_ic; 1256 struct ieee80211_frame *wh; 1257 uint8_t *frm, *efrm; 1258 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1259 uint8_t rate; 1260 1261 wh = mtod(m0, struct ieee80211_frame *); 1262 frm = (uint8_t *)&wh[1]; 1263 efrm = mtod(m0, uint8_t *) + m0->m_len; 1264 switch (subtype) { 1265 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1266 case IEEE80211_FC0_SUBTYPE_BEACON: { 1267 struct ieee80211_scanparams scan; 1268 /* 1269 * We process beacon/probe response frames: 1270 * o when scanning, or 1271 * o station mode when associated (to collect state 1272 * updates such as 802.11g slot time) 1273 * Frames otherwise received are discarded. 1274 */ 1275 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1276 vap->iv_stats.is_rx_mgtdiscard++; 1277 return; 1278 } 1279 /* XXX probe response in sta mode when !scanning? */ 1280 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1281 return; 1282 /* 1283 * Count frame now that we know it's to be processed. 1284 */ 1285 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1286 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1287 IEEE80211_NODE_STAT(ni, rx_beacons); 1288 } else 1289 IEEE80211_NODE_STAT(ni, rx_proberesp); 1290 /* 1291 * When operating in station mode, check for state updates. 1292 * Be careful to ignore beacons received while doing a 1293 * background scan. We consider only 11g/WMM stuff right now. 1294 */ 1295 if (ni->ni_associd != 0 && 1296 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1297 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1298 /* record tsf of last beacon */ 1299 memcpy(ni->ni_tstamp.data, scan.tstamp, 1300 sizeof(ni->ni_tstamp)); 1301 /* count beacon frame for s/w bmiss handling */ 1302 vap->iv_swbmiss_count++; 1303 vap->iv_bmiss_count = 0; 1304 if (ni->ni_erp != scan.erp) { 1305 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1306 wh->i_addr2, 1307 "erp change: was 0x%x, now 0x%x", 1308 ni->ni_erp, scan.erp); 1309 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1310 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1311 ic->ic_flags |= IEEE80211_F_USEPROT; 1312 else 1313 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1314 ni->ni_erp = scan.erp; 1315 /* XXX statistic */ 1316 /* XXX driver notification */ 1317 } 1318 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1319 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1320 wh->i_addr2, 1321 "capabilities change: was 0x%x, now 0x%x", 1322 ni->ni_capinfo, scan.capinfo); 1323 /* 1324 * NB: we assume short preamble doesn't 1325 * change dynamically 1326 */ 1327 ieee80211_set_shortslottime(ic, 1328 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1329 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1330 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1331 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1332 /* XXX statistic */ 1333 } 1334 if (scan.wme != NULL && 1335 (ni->ni_flags & IEEE80211_NODE_QOS) && 1336 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1337 ieee80211_wme_updateparams(vap); 1338 #ifdef IEEE80211_SUPPORT_SUPERG 1339 if (scan.ath != NULL) 1340 ieee80211_parse_athparams(ni, scan.ath, wh); 1341 #endif 1342 if (scan.htcap != NULL && scan.htinfo != NULL && 1343 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1344 ieee80211_ht_updateparams(ni, 1345 scan.htcap, scan.htinfo); 1346 /* XXX state changes? */ 1347 } 1348 if (scan.tim != NULL) { 1349 struct ieee80211_tim_ie *tim = 1350 (struct ieee80211_tim_ie *) scan.tim; 1351 #if 0 1352 int aid = IEEE80211_AID(ni->ni_associd); 1353 int ix = aid / NBBY; 1354 int min = tim->tim_bitctl &~ 1; 1355 int max = tim->tim_len + min - 4; 1356 if ((tim->tim_bitctl&1) || 1357 (min <= ix && ix <= max && 1358 isset(tim->tim_bitmap - min, aid))) { 1359 /* 1360 * XXX Do not let bg scan kick off 1361 * we are expecting data. 1362 */ 1363 ic->ic_lastdata = ticks; 1364 ieee80211_sta_pwrsave(vap, 0); 1365 } 1366 #endif 1367 ni->ni_dtim_count = tim->tim_count; 1368 ni->ni_dtim_period = tim->tim_period; 1369 } 1370 if (scan.csa != NULL && 1371 (vap->iv_flags & IEEE80211_F_DOTH)) 1372 ieee80211_parse_csaparams(vap, scan.csa, wh); 1373 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1374 /* 1375 * No CSA ie or 11h disabled, but a channel 1376 * switch is pending; drop out so we aren't 1377 * stuck in CSA state. If the AP really is 1378 * moving we'll get a beacon miss and scan. 1379 */ 1380 IEEE80211_LOCK(ic); 1381 ieee80211_csa_cancelswitch(ic); 1382 IEEE80211_UNLOCK(ic); 1383 } 1384 /* 1385 * If scanning, pass the info to the scan module. 1386 * Otherwise, check if it's the right time to do 1387 * a background scan. Background scanning must 1388 * be enabled and we must not be operating in the 1389 * turbo phase of dynamic turbo mode. Then, 1390 * it's been a while since the last background 1391 * scan and if no data frames have come through 1392 * recently, kick off a scan. Note that this 1393 * is the mechanism by which a background scan 1394 * is started _and_ continued each time we 1395 * return on-channel to receive a beacon from 1396 * our ap. 1397 */ 1398 if (ic->ic_flags & IEEE80211_F_SCAN) { 1399 ieee80211_add_scan(vap, &scan, wh, 1400 subtype, rssi, nf); 1401 } else if (contbgscan(vap)) { 1402 ieee80211_bg_scan(vap, 0); 1403 } else if (startbgscan(vap)) { 1404 vap->iv_stats.is_scan_bg++; 1405 #if 0 1406 /* wakeup if we are sleeing */ 1407 ieee80211_set_pwrsave(vap, 0); 1408 #endif 1409 ieee80211_bg_scan(vap, 0); 1410 } 1411 return; 1412 } 1413 /* 1414 * If scanning, just pass information to the scan module. 1415 */ 1416 if (ic->ic_flags & IEEE80211_F_SCAN) { 1417 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1418 /* 1419 * Actively scanning a channel marked passive; 1420 * send a probe request now that we know there 1421 * is 802.11 traffic present. 1422 * 1423 * XXX check if the beacon we recv'd gives 1424 * us what we need and suppress the probe req 1425 */ 1426 ieee80211_probe_curchan(vap, 1); 1427 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1428 } 1429 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1430 return; 1431 } 1432 break; 1433 } 1434 1435 case IEEE80211_FC0_SUBTYPE_AUTH: { 1436 uint16_t algo, seq, status; 1437 /* 1438 * auth frame format 1439 * [2] algorithm 1440 * [2] sequence 1441 * [2] status 1442 * [tlv*] challenge 1443 */ 1444 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1445 algo = le16toh(*(uint16_t *)frm); 1446 seq = le16toh(*(uint16_t *)(frm + 2)); 1447 status = le16toh(*(uint16_t *)(frm + 4)); 1448 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1449 "recv auth frame with algorithm %d seq %d", algo, seq); 1450 1451 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1452 IEEE80211_DISCARD(vap, 1453 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1454 wh, "auth", "%s", "TKIP countermeasures enabled"); 1455 vap->iv_stats.is_rx_auth_countermeasures++; 1456 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1457 ieee80211_send_error(ni, wh->i_addr2, 1458 IEEE80211_FC0_SUBTYPE_AUTH, 1459 IEEE80211_REASON_MIC_FAILURE); 1460 } 1461 return; 1462 } 1463 if (algo == IEEE80211_AUTH_ALG_SHARED) 1464 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1465 seq, status); 1466 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1467 sta_auth_open(ni, wh, rssi, nf, seq, status); 1468 else { 1469 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1470 wh, "auth", "unsupported alg %d", algo); 1471 vap->iv_stats.is_rx_auth_unsupported++; 1472 return; 1473 } 1474 break; 1475 } 1476 1477 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1478 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1479 uint16_t capinfo, associd; 1480 uint16_t status; 1481 1482 if (vap->iv_state != IEEE80211_S_ASSOC) { 1483 vap->iv_stats.is_rx_mgtdiscard++; 1484 return; 1485 } 1486 1487 /* 1488 * asresp frame format 1489 * [2] capability information 1490 * [2] status 1491 * [2] association ID 1492 * [tlv] supported rates 1493 * [tlv] extended supported rates 1494 * [tlv] WME 1495 * [tlv] HT capabilities 1496 * [tlv] HT info 1497 */ 1498 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1499 ni = vap->iv_bss; 1500 capinfo = le16toh(*(uint16_t *)frm); 1501 frm += 2; 1502 status = le16toh(*(uint16_t *)frm); 1503 frm += 2; 1504 if (status != 0) { 1505 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1506 wh->i_addr2, "%sassoc failed (reason %d)", 1507 ISREASSOC(subtype) ? "re" : "", status); 1508 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1509 return; 1510 } 1511 associd = le16toh(*(uint16_t *)frm); 1512 frm += 2; 1513 1514 rates = xrates = wme = htcap = htinfo = NULL; 1515 while (efrm - frm > 1) { 1516 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1517 switch (*frm) { 1518 case IEEE80211_ELEMID_RATES: 1519 rates = frm; 1520 break; 1521 case IEEE80211_ELEMID_XRATES: 1522 xrates = frm; 1523 break; 1524 case IEEE80211_ELEMID_HTCAP: 1525 htcap = frm; 1526 break; 1527 case IEEE80211_ELEMID_HTINFO: 1528 htinfo = frm; 1529 break; 1530 case IEEE80211_ELEMID_VENDOR: 1531 if (iswmeoui(frm)) 1532 wme = frm; 1533 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1534 /* 1535 * Accept pre-draft HT ie's if the 1536 * standard ones have not been seen. 1537 */ 1538 if (ishtcapoui(frm)) { 1539 if (htcap == NULL) 1540 htcap = frm; 1541 } else if (ishtinfooui(frm)) { 1542 if (htinfo == NULL) 1543 htinfo = frm; 1544 } 1545 } 1546 /* XXX Atheros OUI support */ 1547 break; 1548 } 1549 frm += frm[1] + 2; 1550 } 1551 1552 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1553 if (xrates != NULL) 1554 IEEE80211_VERIFY_ELEMENT(xrates, 1555 IEEE80211_RATE_MAXSIZE - rates[1], return); 1556 rate = ieee80211_setup_rates(ni, rates, xrates, 1557 IEEE80211_F_JOIN | 1558 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1559 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1560 if (rate & IEEE80211_RATE_BASIC) { 1561 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1562 wh->i_addr2, 1563 "%sassoc failed (rate set mismatch)", 1564 ISREASSOC(subtype) ? "re" : ""); 1565 vap->iv_stats.is_rx_assoc_norate++; 1566 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1567 IEEE80211_SCAN_FAIL_STATUS); 1568 return; 1569 } 1570 1571 ni->ni_capinfo = capinfo; 1572 ni->ni_associd = associd; 1573 if (ni->ni_jointime == 0) 1574 ni->ni_jointime = time_uptime; 1575 if (wme != NULL && 1576 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1577 ni->ni_flags |= IEEE80211_NODE_QOS; 1578 ieee80211_wme_updateparams(vap); 1579 } else 1580 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1581 /* 1582 * Setup HT state according to the negotiation. 1583 * 1584 * NB: shouldn't need to check if HT use is enabled but some 1585 * ap's send back HT ie's even when we don't indicate we 1586 * are HT capable in our AssocReq. 1587 */ 1588 if (htcap != NULL && htinfo != NULL && 1589 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1590 ieee80211_ht_node_init(ni); 1591 ieee80211_ht_updateparams(ni, htcap, htinfo); 1592 ieee80211_setup_htrates(ni, htcap, 1593 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1594 ieee80211_setup_basic_htrates(ni, htinfo); 1595 ieee80211_node_setuptxparms(ni); 1596 ieee80211_ratectl_node_init(ni); 1597 } else { 1598 #ifdef IEEE80211_SUPPORT_SUPERG 1599 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1600 ieee80211_ff_node_init(ni); 1601 #endif 1602 } 1603 /* 1604 * Configure state now that we are associated. 1605 * 1606 * XXX may need different/additional driver callbacks? 1607 */ 1608 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1609 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1610 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1611 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1612 } else { 1613 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1614 ic->ic_flags |= IEEE80211_F_USEBARKER; 1615 } 1616 ieee80211_set_shortslottime(ic, 1617 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1618 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1619 /* 1620 * Honor ERP protection. 1621 * 1622 * NB: ni_erp should zero for non-11g operation. 1623 */ 1624 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1625 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1626 ic->ic_flags |= IEEE80211_F_USEPROT; 1627 else 1628 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1629 IEEE80211_NOTE_MAC(vap, 1630 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1631 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1632 ISREASSOC(subtype) ? "re" : "", 1633 IEEE80211_NODE_AID(ni), 1634 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1635 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1636 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1637 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1638 ni->ni_flags & IEEE80211_NODE_HT ? 1639 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1640 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1641 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1642 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1643 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1644 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1645 ", fast-frames" : "", 1646 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1647 ", turbo" : "" 1648 ); 1649 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1650 break; 1651 } 1652 1653 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1654 uint16_t reason; 1655 1656 if (vap->iv_state == IEEE80211_S_SCAN) { 1657 vap->iv_stats.is_rx_mgtdiscard++; 1658 return; 1659 } 1660 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1661 /* NB: can happen when in promiscuous mode */ 1662 vap->iv_stats.is_rx_mgtdiscard++; 1663 break; 1664 } 1665 1666 /* 1667 * deauth frame format 1668 * [2] reason 1669 */ 1670 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1671 reason = le16toh(*(uint16_t *)frm); 1672 1673 vap->iv_stats.is_rx_deauth++; 1674 vap->iv_stats.is_rx_deauth_code = reason; 1675 IEEE80211_NODE_STAT(ni, rx_deauth); 1676 1677 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1678 "recv deauthenticate (reason %d)", reason); 1679 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1680 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1681 break; 1682 } 1683 1684 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1685 uint16_t reason; 1686 1687 if (vap->iv_state != IEEE80211_S_RUN && 1688 vap->iv_state != IEEE80211_S_ASSOC && 1689 vap->iv_state != IEEE80211_S_AUTH) { 1690 vap->iv_stats.is_rx_mgtdiscard++; 1691 return; 1692 } 1693 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1694 /* NB: can happen when in promiscuous mode */ 1695 vap->iv_stats.is_rx_mgtdiscard++; 1696 break; 1697 } 1698 1699 /* 1700 * disassoc frame format 1701 * [2] reason 1702 */ 1703 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1704 reason = le16toh(*(uint16_t *)frm); 1705 1706 vap->iv_stats.is_rx_disassoc++; 1707 vap->iv_stats.is_rx_disassoc_code = reason; 1708 IEEE80211_NODE_STAT(ni, rx_disassoc); 1709 1710 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1711 "recv disassociate (reason %d)", reason); 1712 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1713 break; 1714 } 1715 1716 case IEEE80211_FC0_SUBTYPE_ACTION: 1717 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1718 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1719 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1720 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1721 wh, NULL, "%s", "not for us"); 1722 vap->iv_stats.is_rx_mgtdiscard++; 1723 } else if (vap->iv_state != IEEE80211_S_RUN) { 1724 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1725 wh, NULL, "wrong state %s", 1726 ieee80211_state_name[vap->iv_state]); 1727 vap->iv_stats.is_rx_mgtdiscard++; 1728 } else { 1729 if (ieee80211_parse_action(ni, m0) == 0) 1730 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1731 } 1732 break; 1733 1734 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1735 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1736 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1737 case IEEE80211_FC0_SUBTYPE_ATIM: 1738 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1739 wh, NULL, "%s", "not handled"); 1740 vap->iv_stats.is_rx_mgtdiscard++; 1741 break; 1742 1743 default: 1744 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1745 wh, "mgt", "subtype 0x%x not handled", subtype); 1746 vap->iv_stats.is_rx_badsubtype++; 1747 break; 1748 } 1749 #undef ISREASSOC 1750 #undef ISPROBE 1751 } 1752 1753 static void 1754 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1755 { 1756 switch (subtype) { 1757 case IEEE80211_FC0_SUBTYPE_BAR: 1758 ieee80211_recv_bar(ni, m); 1759 break; 1760 } 1761 }
Cache object: 796f1b60b2f943e816c887b9a04b2631
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