ieee80211_sta.c revision 241138
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: head/sys/net80211/ieee80211_sta.c 241138 2012-10-02 17:45:19Z 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/if_dl.h> 54#include <net/if_var.h> 55#include <net/ethernet.h> 56 57#include <net/bpf.h> 58 59#include <net80211/ieee80211_var.h> 60#include <net80211/ieee80211_sta.h> 61#include <net80211/ieee80211_input.h> 62#ifdef IEEE80211_SUPPORT_SUPERG 63#include <net80211/ieee80211_superg.h> 64#endif 65#include <net80211/ieee80211_ratectl.h> 66 67#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 68 69static void sta_vattach(struct ieee80211vap *); 70static void sta_beacon_miss(struct ieee80211vap *); 71static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 72static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 73static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int nf); 75static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 76 77void 78ieee80211_sta_attach(struct ieee80211com *ic) 79{ 80 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 81} 82 83void 84ieee80211_sta_detach(struct ieee80211com *ic) 85{ 86} 87 88static void 89sta_vdetach(struct ieee80211vap *vap) 90{ 91} 92 93static void 94sta_vattach(struct ieee80211vap *vap) 95{ 96 vap->iv_newstate = sta_newstate; 97 vap->iv_input = sta_input; 98 vap->iv_recv_mgmt = sta_recv_mgmt; 99 vap->iv_recv_ctl = sta_recv_ctl; 100 vap->iv_opdetach = sta_vdetach; 101 vap->iv_bmiss = sta_beacon_miss; 102} 103 104/* 105 * Handle a beacon miss event. The common code filters out 106 * spurious events that can happen when scanning and/or before 107 * reaching RUN state. 108 */ 109static void 110sta_beacon_miss(struct ieee80211vap *vap) 111{ 112 struct ieee80211com *ic = vap->iv_ic; 113 114 IEEE80211_LOCK_ASSERT(ic); 115 116 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 117 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 118 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 119 120 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 121 "beacon miss, mode %s state %s\n", 122 ieee80211_opmode_name[vap->iv_opmode], 123 ieee80211_state_name[vap->iv_state]); 124 125 if (vap->iv_state == IEEE80211_S_CSA) { 126 /* 127 * A Channel Switch is pending; assume we missed the 128 * beacon that would've completed the process and just 129 * force the switch. If we made a mistake we'll not 130 * find the AP on the new channel and fall back to a 131 * normal scan. 132 */ 133 ieee80211_csa_completeswitch(ic); 134 return; 135 } 136 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 137 /* 138 * Send a directed probe req before falling back to a 139 * scan; if we receive a response ic_bmiss_count will 140 * be reset. Some cards mistakenly report beacon miss 141 * so this avoids the expensive scan if the ap is 142 * still there. 143 */ 144 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 145 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 146 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 147 return; 148 } 149 150 callout_stop(&vap->iv_swbmiss); 151 vap->iv_bmiss_count = 0; 152 vap->iv_stats.is_beacon_miss++; 153 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 154#ifdef IEEE80211_SUPPORT_SUPERG 155 struct ieee80211com *ic = vap->iv_ic; 156 157 /* 158 * If we receive a beacon miss interrupt when using 159 * dynamic turbo, attempt to switch modes before 160 * reassociating. 161 */ 162 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 163 ieee80211_dturbo_switch(vap, 164 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 165#endif 166 /* 167 * Try to reassociate before scanning for a new ap. 168 */ 169 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 170 } else { 171 /* 172 * Somebody else is controlling state changes (e.g. 173 * a user-mode app) don't do anything that would 174 * confuse them; just drop into scan mode so they'll 175 * notified of the state change and given control. 176 */ 177 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 178 } 179} 180 181/* 182 * Handle deauth with reason. We retry only for 183 * the cases where we might succeed. Otherwise 184 * we downgrade the ap and scan. 185 */ 186static void 187sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 188{ 189 switch (reason) { 190 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 191 case IEEE80211_STATUS_TIMEOUT: 192 case IEEE80211_REASON_ASSOC_EXPIRE: 193 case IEEE80211_REASON_NOT_AUTHED: 194 case IEEE80211_REASON_NOT_ASSOCED: 195 case IEEE80211_REASON_ASSOC_LEAVE: 196 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 197 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 198 break; 199 default: 200 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 201 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 202 ieee80211_check_scan_current(vap); 203 break; 204 } 205} 206 207/* 208 * IEEE80211_M_STA vap state machine handler. 209 * This routine handles the main states in the 802.11 protocol. 210 */ 211static int 212sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 213{ 214 struct ieee80211com *ic = vap->iv_ic; 215 struct ieee80211_node *ni; 216 enum ieee80211_state ostate; 217 218 IEEE80211_LOCK_ASSERT(ic); 219 220 ostate = vap->iv_state; 221 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 222 __func__, ieee80211_state_name[ostate], 223 ieee80211_state_name[nstate], arg); 224 vap->iv_state = nstate; /* state transition */ 225 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 226 if (ostate != IEEE80211_S_SCAN) 227 ieee80211_cancel_scan(vap); /* background scan */ 228 ni = vap->iv_bss; /* NB: no reference held */ 229 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 230 callout_stop(&vap->iv_swbmiss); 231 switch (nstate) { 232 case IEEE80211_S_INIT: 233 switch (ostate) { 234 case IEEE80211_S_SLEEP: 235 /* XXX wakeup */ 236 case IEEE80211_S_RUN: 237 IEEE80211_SEND_MGMT(ni, 238 IEEE80211_FC0_SUBTYPE_DISASSOC, 239 IEEE80211_REASON_ASSOC_LEAVE); 240 ieee80211_sta_leave(ni); 241 break; 242 case IEEE80211_S_ASSOC: 243 IEEE80211_SEND_MGMT(ni, 244 IEEE80211_FC0_SUBTYPE_DEAUTH, 245 IEEE80211_REASON_AUTH_LEAVE); 246 break; 247 case IEEE80211_S_SCAN: 248 ieee80211_cancel_scan(vap); 249 break; 250 default: 251 goto invalid; 252 } 253 if (ostate != IEEE80211_S_INIT) { 254 /* NB: optimize INIT -> INIT case */ 255 ieee80211_reset_bss(vap); 256 } 257 if (vap->iv_auth->ia_detach != NULL) 258 vap->iv_auth->ia_detach(vap); 259 break; 260 case IEEE80211_S_SCAN: 261 switch (ostate) { 262 case IEEE80211_S_INIT: 263 /* 264 * Initiate a scan. We can come here as a result 265 * of an IEEE80211_IOC_SCAN_REQ too in which case 266 * the vap will be marked with IEEE80211_FEXT_SCANREQ 267 * and the scan request parameters will be present 268 * in iv_scanreq. Otherwise we do the default. 269 */ 270 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 271 ieee80211_check_scan(vap, 272 vap->iv_scanreq_flags, 273 vap->iv_scanreq_duration, 274 vap->iv_scanreq_mindwell, 275 vap->iv_scanreq_maxdwell, 276 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 277 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 278 } else 279 ieee80211_check_scan_current(vap); 280 break; 281 case IEEE80211_S_SCAN: 282 case IEEE80211_S_AUTH: 283 case IEEE80211_S_ASSOC: 284 /* 285 * These can happen either because of a timeout 286 * on an assoc/auth response or because of a 287 * change in state that requires a reset. For 288 * the former we're called with a non-zero arg 289 * that is the cause for the failure; pass this 290 * to the scan code so it can update state. 291 * Otherwise trigger a new scan unless we're in 292 * manual roaming mode in which case an application 293 * must issue an explicit scan request. 294 */ 295 if (arg != 0) 296 ieee80211_scan_assoc_fail(vap, 297 vap->iv_bss->ni_macaddr, arg); 298 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 299 ieee80211_check_scan_current(vap); 300 break; 301 case IEEE80211_S_RUN: /* beacon miss */ 302 /* 303 * Beacon miss. Notify user space and if not 304 * under control of a user application (roaming 305 * manual) kick off a scan to re-connect. 306 */ 307 ieee80211_sta_leave(ni); 308 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 309 ieee80211_check_scan_current(vap); 310 break; 311 default: 312 goto invalid; 313 } 314 break; 315 case IEEE80211_S_AUTH: 316 switch (ostate) { 317 case IEEE80211_S_INIT: 318 case IEEE80211_S_SCAN: 319 IEEE80211_SEND_MGMT(ni, 320 IEEE80211_FC0_SUBTYPE_AUTH, 1); 321 break; 322 case IEEE80211_S_AUTH: 323 case IEEE80211_S_ASSOC: 324 switch (arg & 0xff) { 325 case IEEE80211_FC0_SUBTYPE_AUTH: 326 /* ??? */ 327 IEEE80211_SEND_MGMT(ni, 328 IEEE80211_FC0_SUBTYPE_AUTH, 2); 329 break; 330 case IEEE80211_FC0_SUBTYPE_DEAUTH: 331 sta_authretry(vap, ni, arg>>8); 332 break; 333 } 334 break; 335 case IEEE80211_S_RUN: 336 switch (arg & 0xff) { 337 case IEEE80211_FC0_SUBTYPE_AUTH: 338 IEEE80211_SEND_MGMT(ni, 339 IEEE80211_FC0_SUBTYPE_AUTH, 2); 340 vap->iv_state = ostate; /* stay RUN */ 341 break; 342 case IEEE80211_FC0_SUBTYPE_DEAUTH: 343 ieee80211_sta_leave(ni); 344 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 345 /* try to reauth */ 346 IEEE80211_SEND_MGMT(ni, 347 IEEE80211_FC0_SUBTYPE_AUTH, 1); 348 } 349 break; 350 } 351 break; 352 default: 353 goto invalid; 354 } 355 break; 356 case IEEE80211_S_ASSOC: 357 switch (ostate) { 358 case IEEE80211_S_AUTH: 359 case IEEE80211_S_ASSOC: 360 IEEE80211_SEND_MGMT(ni, 361 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 362 break; 363 case IEEE80211_S_SLEEP: /* cannot happen */ 364 case IEEE80211_S_RUN: 365 ieee80211_sta_leave(ni); 366 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 367 IEEE80211_SEND_MGMT(ni, arg ? 368 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 369 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 370 } 371 break; 372 default: 373 goto invalid; 374 } 375 break; 376 case IEEE80211_S_RUN: 377 if (vap->iv_flags & IEEE80211_F_WPA) { 378 /* XXX validate prerequisites */ 379 } 380 switch (ostate) { 381 case IEEE80211_S_RUN: 382 case IEEE80211_S_CSA: 383 break; 384 case IEEE80211_S_AUTH: /* when join is done in fw */ 385 case IEEE80211_S_ASSOC: 386#ifdef IEEE80211_DEBUG 387 if (ieee80211_msg_debug(vap)) { 388 ieee80211_note(vap, "%s with %s ssid ", 389 (vap->iv_opmode == IEEE80211_M_STA ? 390 "associated" : "synchronized"), 391 ether_sprintf(ni->ni_bssid)); 392 ieee80211_print_essid(vap->iv_bss->ni_essid, 393 ni->ni_esslen); 394 /* XXX MCS/HT */ 395 printf(" channel %d start %uMb\n", 396 ieee80211_chan2ieee(ic, ic->ic_curchan), 397 IEEE80211_RATE2MBS(ni->ni_txrate)); 398 } 399#endif 400 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 401 ieee80211_notify_node_join(ni, 402 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 403 break; 404 case IEEE80211_S_SLEEP: 405 vap->iv_sta_ps(vap, 0); 406 break; 407 default: 408 goto invalid; 409 } 410 ieee80211_sync_curchan(ic); 411 if (ostate != IEEE80211_S_RUN && 412 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 413 /* 414 * Start s/w beacon miss timer for devices w/o 415 * hardware support. We fudge a bit here since 416 * we're doing this in software. 417 */ 418 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 419 2 * vap->iv_bmissthreshold * ni->ni_intval); 420 vap->iv_swbmiss_count = 0; 421 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 422 ieee80211_swbmiss, vap); 423 } 424 /* 425 * When 802.1x is not in use mark the port authorized 426 * at this point so traffic can flow. 427 */ 428 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 429 ieee80211_node_authorize(ni); 430 /* 431 * Fake association when joining an existing bss. 432 */ 433 if (ic->ic_newassoc != NULL) 434 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 435 break; 436 case IEEE80211_S_CSA: 437 if (ostate != IEEE80211_S_RUN) 438 goto invalid; 439 break; 440 case IEEE80211_S_SLEEP: 441 vap->iv_sta_ps(vap, 1); 442 break; 443 default: 444 invalid: 445 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 446 "%s: unexpected state transition %s -> %s\n", __func__, 447 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 448 break; 449 } 450 return 0; 451} 452 453/* 454 * Return non-zero if the frame is an echo of a multicast 455 * frame sent by ourself. The dir is known to be DSTODS. 456 */ 457static __inline int 458isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 459{ 460#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 461#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 462 const uint8_t *sa; 463 464 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 465 466 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 467 return 0; 468 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 469 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 470#undef WH4 471#undef QWH4 472} 473 474/* 475 * Return non-zero if the frame is an echo of a multicast 476 * frame sent by ourself. The dir is known to be FROMDS. 477 */ 478static __inline int 479isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 480{ 481 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 482 483 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 484 return 0; 485 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 486} 487 488/* 489 * Decide if a received management frame should be 490 * printed when debugging is enabled. This filters some 491 * of the less interesting frames that come frequently 492 * (e.g. beacons). 493 */ 494static __inline int 495doprint(struct ieee80211vap *vap, int subtype) 496{ 497 switch (subtype) { 498 case IEEE80211_FC0_SUBTYPE_BEACON: 499 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 500 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 501 return 0; 502 } 503 return 1; 504} 505 506/* 507 * Process a received frame. The node associated with the sender 508 * should be supplied. If nothing was found in the node table then 509 * the caller is assumed to supply a reference to iv_bss instead. 510 * The RSSI and a timestamp are also supplied. The RSSI data is used 511 * during AP scanning to select a AP to associate with; it can have 512 * any units so long as values have consistent units and higher values 513 * mean ``better signal''. The receive timestamp is currently not used 514 * by the 802.11 layer. 515 */ 516static int 517sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 518{ 519#define HAS_SEQ(type) ((type & 0x4) == 0) 520 struct ieee80211vap *vap = ni->ni_vap; 521 struct ieee80211com *ic = ni->ni_ic; 522 struct ifnet *ifp = vap->iv_ifp; 523 struct ieee80211_frame *wh; 524 struct ieee80211_key *key; 525 struct ether_header *eh; 526 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 527 uint8_t dir, type, subtype, qos; 528 uint8_t *bssid; 529 uint16_t rxseq; 530 531 if (m->m_flags & M_AMPDU_MPDU) { 532 /* 533 * Fastpath for A-MPDU reorder q resubmission. Frames 534 * w/ M_AMPDU_MPDU marked have already passed through 535 * here but were received out of order and been held on 536 * the reorder queue. When resubmitted they are marked 537 * with the M_AMPDU_MPDU flag and we can bypass most of 538 * the normal processing. 539 */ 540 wh = mtod(m, struct ieee80211_frame *); 541 type = IEEE80211_FC0_TYPE_DATA; 542 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 543 subtype = IEEE80211_FC0_SUBTYPE_QOS; 544 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 545 goto resubmit_ampdu; 546 } 547 548 KASSERT(ni != NULL, ("null node")); 549 ni->ni_inact = ni->ni_inact_reload; 550 551 type = -1; /* undefined */ 552 553 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 554 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 555 ni->ni_macaddr, NULL, 556 "too short (1): len %u", m->m_pkthdr.len); 557 vap->iv_stats.is_rx_tooshort++; 558 goto out; 559 } 560 /* 561 * Bit of a cheat here, we use a pointer for a 3-address 562 * frame format but don't reference fields past outside 563 * ieee80211_frame_min w/o first validating the data is 564 * present. 565 */ 566 wh = mtod(m, struct ieee80211_frame *); 567 568 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 569 IEEE80211_FC0_VERSION_0) { 570 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 571 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 572 wh->i_fc[0], wh->i_fc[1]); 573 vap->iv_stats.is_rx_badversion++; 574 goto err; 575 } 576 577 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 578 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 579 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 580 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 581 bssid = wh->i_addr2; 582 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 583 /* not interested in */ 584 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 585 bssid, NULL, "%s", "not to bss"); 586 vap->iv_stats.is_rx_wrongbss++; 587 goto out; 588 } 589 590 /* 591 * Some devices may be in a promiscuous mode 592 * where they receive frames for multiple station 593 * addresses. 594 * 595 * If we receive a data frame that isn't 596 * destined to our VAP MAC, drop it. 597 * 598 * XXX TODO: This is only enforced when not scanning; 599 * XXX it assumes a software-driven scan will put the NIC 600 * XXX into a "no data frames" mode before setting this 601 * XXX flag. Otherwise it may be possible that we'll still 602 * XXX process data frames whilst scanning. 603 */ 604 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 605 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 606 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 607 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 608 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 609 vap->iv_stats.is_rx_wrongbss++; 610 goto out; 611 } 612 613 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 614 ni->ni_noise = nf; 615 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 616 uint8_t tid = ieee80211_gettid(wh); 617 if (IEEE80211_QOS_HAS_SEQ(wh) && 618 TID_TO_WME_AC(tid) >= WME_AC_VI) 619 ic->ic_wme.wme_hipri_traffic++; 620 rxseq = le16toh(*(uint16_t *)wh->i_seq); 621 if (! ieee80211_check_rxseq(ni, wh)) { 622 /* duplicate, discard */ 623 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 624 bssid, "duplicate", 625 "seqno <%u,%u> fragno <%u,%u> tid %u", 626 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 627 ni->ni_rxseqs[tid] >> 628 IEEE80211_SEQ_SEQ_SHIFT, 629 rxseq & IEEE80211_SEQ_FRAG_MASK, 630 ni->ni_rxseqs[tid] & 631 IEEE80211_SEQ_FRAG_MASK, 632 tid); 633 vap->iv_stats.is_rx_dup++; 634 IEEE80211_NODE_STAT(ni, rx_dup); 635 goto out; 636 } 637 ni->ni_rxseqs[tid] = rxseq; 638 } 639 } 640 641 switch (type) { 642 case IEEE80211_FC0_TYPE_DATA: 643 hdrspace = ieee80211_hdrspace(ic, wh); 644 if (m->m_len < hdrspace && 645 (m = m_pullup(m, hdrspace)) == NULL) { 646 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 647 ni->ni_macaddr, NULL, 648 "data too short: expecting %u", hdrspace); 649 vap->iv_stats.is_rx_tooshort++; 650 goto out; /* XXX */ 651 } 652 /* 653 * Handle A-MPDU re-ordering. If the frame is to be 654 * processed directly then ieee80211_ampdu_reorder 655 * will return 0; otherwise it has consumed the mbuf 656 * and we should do nothing more with it. 657 */ 658 if ((m->m_flags & M_AMPDU) && 659 (dir == IEEE80211_FC1_DIR_FROMDS || 660 dir == IEEE80211_FC1_DIR_DSTODS) && 661 ieee80211_ampdu_reorder(ni, m) != 0) { 662 m = NULL; 663 goto out; 664 } 665 resubmit_ampdu: 666 if (dir == IEEE80211_FC1_DIR_FROMDS) { 667 if ((ifp->if_flags & IFF_SIMPLEX) && 668 isfromds_mcastecho(vap, wh)) { 669 /* 670 * In IEEE802.11 network, multicast 671 * packets sent from "me" are broadcast 672 * from the AP; silently discard for 673 * SIMPLEX interface. 674 */ 675 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 676 wh, "data", "%s", "multicast echo"); 677 vap->iv_stats.is_rx_mcastecho++; 678 goto out; 679 } 680 if ((vap->iv_flags & IEEE80211_F_DWDS) && 681 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 682 /* 683 * DWDS sta's must drop 3-address mcast frames 684 * as they will be sent separately as a 4-addr 685 * frame. Accepting the 3-addr frame will 686 * confuse the bridge into thinking the sending 687 * sta is located at the end of WDS link. 688 */ 689 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 690 "3-address data", "%s", "DWDS enabled"); 691 vap->iv_stats.is_rx_mcastecho++; 692 goto out; 693 } 694 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 695 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 696 IEEE80211_DISCARD(vap, 697 IEEE80211_MSG_INPUT, wh, "4-address data", 698 "%s", "DWDS not enabled"); 699 vap->iv_stats.is_rx_wrongdir++; 700 goto out; 701 } 702 if ((ifp->if_flags & IFF_SIMPLEX) && 703 isdstods_mcastecho(vap, wh)) { 704 /* 705 * In IEEE802.11 network, multicast 706 * packets sent from "me" are broadcast 707 * from the AP; silently discard for 708 * SIMPLEX interface. 709 */ 710 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 711 "4-address data", "%s", "multicast echo"); 712 vap->iv_stats.is_rx_mcastecho++; 713 goto out; 714 } 715 } else { 716 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 717 "data", "incorrect dir 0x%x", dir); 718 vap->iv_stats.is_rx_wrongdir++; 719 goto out; 720 } 721 722 /* 723 * Handle privacy requirements. Note that we 724 * must not be preempted from here until after 725 * we (potentially) call ieee80211_crypto_demic; 726 * otherwise we may violate assumptions in the 727 * crypto cipher modules used to do delayed update 728 * of replay sequence numbers. 729 */ 730 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 731 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 732 /* 733 * Discard encrypted frames when privacy is off. 734 */ 735 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 736 wh, "WEP", "%s", "PRIVACY off"); 737 vap->iv_stats.is_rx_noprivacy++; 738 IEEE80211_NODE_STAT(ni, rx_noprivacy); 739 goto out; 740 } 741 key = ieee80211_crypto_decap(ni, m, hdrspace); 742 if (key == NULL) { 743 /* NB: stats+msgs handled in crypto_decap */ 744 IEEE80211_NODE_STAT(ni, rx_wepfail); 745 goto out; 746 } 747 wh = mtod(m, struct ieee80211_frame *); 748 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 749 } else { 750 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 751 key = NULL; 752 } 753 754 /* 755 * Save QoS bits for use below--before we strip the header. 756 */ 757 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 758 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 759 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 760 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 761 } else 762 qos = 0; 763 764 /* 765 * Next up, any fragmentation. 766 */ 767 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 768 m = ieee80211_defrag(ni, m, hdrspace); 769 if (m == NULL) { 770 /* Fragment dropped or frame not complete yet */ 771 goto out; 772 } 773 } 774 wh = NULL; /* no longer valid, catch any uses */ 775 776 /* 777 * Next strip any MSDU crypto bits. 778 */ 779 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 780 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 781 ni->ni_macaddr, "data", "%s", "demic error"); 782 vap->iv_stats.is_rx_demicfail++; 783 IEEE80211_NODE_STAT(ni, rx_demicfail); 784 goto out; 785 } 786 787 /* copy to listener after decrypt */ 788 if (ieee80211_radiotap_active_vap(vap)) 789 ieee80211_radiotap_rx(vap, m); 790 need_tap = 0; 791 792 /* 793 * Finally, strip the 802.11 header. 794 */ 795 m = ieee80211_decap(vap, m, hdrspace); 796 if (m == NULL) { 797 /* XXX mask bit to check for both */ 798 /* don't count Null data frames as errors */ 799 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 800 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 801 goto out; 802 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 803 ni->ni_macaddr, "data", "%s", "decap error"); 804 vap->iv_stats.is_rx_decap++; 805 IEEE80211_NODE_STAT(ni, rx_decap); 806 goto err; 807 } 808 eh = mtod(m, struct ether_header *); 809 if (!ieee80211_node_is_authorized(ni)) { 810 /* 811 * Deny any non-PAE frames received prior to 812 * authorization. For open/shared-key 813 * authentication the port is mark authorized 814 * after authentication completes. For 802.1x 815 * the port is not marked authorized by the 816 * authenticator until the handshake has completed. 817 */ 818 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 819 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 820 eh->ether_shost, "data", 821 "unauthorized port: ether type 0x%x len %u", 822 eh->ether_type, m->m_pkthdr.len); 823 vap->iv_stats.is_rx_unauth++; 824 IEEE80211_NODE_STAT(ni, rx_unauth); 825 goto err; 826 } 827 } else { 828 /* 829 * When denying unencrypted frames, discard 830 * any non-PAE frames received without encryption. 831 */ 832 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 833 (key == NULL && (m->m_flags & M_WEP) == 0) && 834 eh->ether_type != htons(ETHERTYPE_PAE)) { 835 /* 836 * Drop unencrypted frames. 837 */ 838 vap->iv_stats.is_rx_unencrypted++; 839 IEEE80211_NODE_STAT(ni, rx_unencrypted); 840 goto out; 841 } 842 } 843 /* XXX require HT? */ 844 if (qos & IEEE80211_QOS_AMSDU) { 845 m = ieee80211_decap_amsdu(ni, m); 846 if (m == NULL) 847 return IEEE80211_FC0_TYPE_DATA; 848 } else { 849#ifdef IEEE80211_SUPPORT_SUPERG 850 m = ieee80211_decap_fastframe(vap, ni, m); 851 if (m == NULL) 852 return IEEE80211_FC0_TYPE_DATA; 853#endif 854 } 855 ieee80211_deliver_data(vap, ni, m); 856 return IEEE80211_FC0_TYPE_DATA; 857 858 case IEEE80211_FC0_TYPE_MGT: 859 vap->iv_stats.is_rx_mgmt++; 860 IEEE80211_NODE_STAT(ni, rx_mgmt); 861 if (dir != IEEE80211_FC1_DIR_NODS) { 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, "data", "incorrect dir 0x%x", dir); 864 vap->iv_stats.is_rx_wrongdir++; 865 goto err; 866 } 867 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 868 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 869 ni->ni_macaddr, "mgt", "too short: len %u", 870 m->m_pkthdr.len); 871 vap->iv_stats.is_rx_tooshort++; 872 goto out; 873 } 874#ifdef IEEE80211_DEBUG 875 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 876 ieee80211_msg_dumppkts(vap)) { 877 if_printf(ifp, "received %s from %s rssi %d\n", 878 ieee80211_mgt_subtype_name[subtype >> 879 IEEE80211_FC0_SUBTYPE_SHIFT], 880 ether_sprintf(wh->i_addr2), rssi); 881 } 882#endif 883 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 884 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 885 /* 886 * Only shared key auth frames with a challenge 887 * should be encrypted, discard all others. 888 */ 889 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 890 wh, ieee80211_mgt_subtype_name[subtype >> 891 IEEE80211_FC0_SUBTYPE_SHIFT], 892 "%s", "WEP set but not permitted"); 893 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 894 goto out; 895 } 896 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 897 /* 898 * Discard encrypted frames when privacy is off. 899 */ 900 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 901 wh, "mgt", "%s", "WEP set but PRIVACY off"); 902 vap->iv_stats.is_rx_noprivacy++; 903 goto out; 904 } 905 hdrspace = ieee80211_hdrspace(ic, wh); 906 key = ieee80211_crypto_decap(ni, m, hdrspace); 907 if (key == NULL) { 908 /* NB: stats+msgs handled in crypto_decap */ 909 goto out; 910 } 911 wh = mtod(m, struct ieee80211_frame *); 912 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 913 } 914 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 915 goto out; 916 917 case IEEE80211_FC0_TYPE_CTL: 918 vap->iv_stats.is_rx_ctl++; 919 IEEE80211_NODE_STAT(ni, rx_ctrl); 920 vap->iv_recv_ctl(ni, m, subtype); 921 goto out; 922 923 default: 924 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 925 wh, NULL, "bad frame type 0x%x", type); 926 /* should not come here */ 927 break; 928 } 929err: 930 ifp->if_ierrors++; 931out: 932 if (m != NULL) { 933 if (need_tap && ieee80211_radiotap_active_vap(vap)) 934 ieee80211_radiotap_rx(vap, m); 935 m_freem(m); 936 } 937 return type; 938} 939 940static void 941sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 942 int rssi, int nf, uint16_t seq, uint16_t status) 943{ 944 struct ieee80211vap *vap = ni->ni_vap; 945 946 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 947 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 948 ni->ni_macaddr, "open auth", 949 "bad sta auth mode %u", ni->ni_authmode); 950 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 951 return; 952 } 953 if (vap->iv_state != IEEE80211_S_AUTH || 954 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 955 vap->iv_stats.is_rx_bad_auth++; 956 return; 957 } 958 if (status != 0) { 959 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 960 ni, "open auth failed (reason %d)", status); 961 vap->iv_stats.is_rx_auth_fail++; 962 vap->iv_stats.is_rx_authfail_code = status; 963 ieee80211_new_state(vap, IEEE80211_S_SCAN, 964 IEEE80211_SCAN_FAIL_STATUS); 965 } else 966 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 967} 968 969static void 970sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 971 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 972 uint16_t seq, uint16_t status) 973{ 974 struct ieee80211vap *vap = ni->ni_vap; 975 uint8_t *challenge; 976 int estatus; 977 978 /* 979 * NB: this can happen as we allow pre-shared key 980 * authentication to be enabled w/o wep being turned 981 * on so that configuration of these can be done 982 * in any order. It may be better to enforce the 983 * ordering in which case this check would just be 984 * for sanity/consistency. 985 */ 986 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 987 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 988 ni->ni_macaddr, "shared key auth", 989 "%s", " PRIVACY is disabled"); 990 estatus = IEEE80211_STATUS_ALG; 991 goto bad; 992 } 993 /* 994 * Pre-shared key authentication is evil; accept 995 * it only if explicitly configured (it is supported 996 * mainly for compatibility with clients like OS X). 997 */ 998 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 999 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1000 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1001 ni->ni_macaddr, "shared key auth", 1002 "bad sta auth mode %u", ni->ni_authmode); 1003 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1004 estatus = IEEE80211_STATUS_ALG; 1005 goto bad; 1006 } 1007 1008 challenge = NULL; 1009 if (frm + 1 < efrm) { 1010 if ((frm[1] + 2) > (efrm - frm)) { 1011 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1012 ni->ni_macaddr, "shared key auth", 1013 "ie %d/%d too long", 1014 frm[0], (frm[1] + 2) - (efrm - frm)); 1015 vap->iv_stats.is_rx_bad_auth++; 1016 estatus = IEEE80211_STATUS_CHALLENGE; 1017 goto bad; 1018 } 1019 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1020 challenge = frm; 1021 frm += frm[1] + 2; 1022 } 1023 switch (seq) { 1024 case IEEE80211_AUTH_SHARED_CHALLENGE: 1025 case IEEE80211_AUTH_SHARED_RESPONSE: 1026 if (challenge == NULL) { 1027 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1028 ni->ni_macaddr, "shared key auth", 1029 "%s", "no challenge"); 1030 vap->iv_stats.is_rx_bad_auth++; 1031 estatus = IEEE80211_STATUS_CHALLENGE; 1032 goto bad; 1033 } 1034 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1035 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1036 ni->ni_macaddr, "shared key auth", 1037 "bad challenge len %d", challenge[1]); 1038 vap->iv_stats.is_rx_bad_auth++; 1039 estatus = IEEE80211_STATUS_CHALLENGE; 1040 goto bad; 1041 } 1042 default: 1043 break; 1044 } 1045 if (vap->iv_state != IEEE80211_S_AUTH) 1046 return; 1047 switch (seq) { 1048 case IEEE80211_AUTH_SHARED_PASS: 1049 if (ni->ni_challenge != NULL) { 1050 free(ni->ni_challenge, M_80211_NODE); 1051 ni->ni_challenge = NULL; 1052 } 1053 if (status != 0) { 1054 IEEE80211_NOTE_FRAME(vap, 1055 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1056 "shared key auth failed (reason %d)", status); 1057 vap->iv_stats.is_rx_auth_fail++; 1058 vap->iv_stats.is_rx_authfail_code = status; 1059 return; 1060 } 1061 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1062 break; 1063 case IEEE80211_AUTH_SHARED_CHALLENGE: 1064 if (!ieee80211_alloc_challenge(ni)) 1065 return; 1066 /* XXX could optimize by passing recvd challenge */ 1067 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1068 IEEE80211_SEND_MGMT(ni, 1069 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1070 break; 1071 default: 1072 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1073 wh, "shared key auth", "bad seq %d", seq); 1074 vap->iv_stats.is_rx_bad_auth++; 1075 return; 1076 } 1077 return; 1078bad: 1079 /* 1080 * Kick the state machine. This short-circuits 1081 * using the mgt frame timeout to trigger the 1082 * state transition. 1083 */ 1084 if (vap->iv_state == IEEE80211_S_AUTH) 1085 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1086 IEEE80211_SCAN_FAIL_STATUS); 1087} 1088 1089static int 1090ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1091 const struct ieee80211_frame *wh) 1092{ 1093#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1094 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1095 u_int len = frm[1], qosinfo; 1096 int i; 1097 1098 if (len < sizeof(struct ieee80211_wme_param)-2) { 1099 IEEE80211_DISCARD_IE(vap, 1100 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1101 wh, "WME", "too short, len %u", len); 1102 return -1; 1103 } 1104 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1105 qosinfo &= WME_QOSINFO_COUNT; 1106 /* XXX do proper check for wraparound */ 1107 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1108 return 0; 1109 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1110 for (i = 0; i < WME_NUM_AC; i++) { 1111 struct wmeParams *wmep = 1112 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1113 /* NB: ACI not used */ 1114 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1115 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1116 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1117 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1118 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1119 frm += 4; 1120 } 1121 wme->wme_wmeChanParams.cap_info = qosinfo; 1122 return 1; 1123#undef MS 1124} 1125 1126/* 1127 * Process 11h Channel Switch Announcement (CSA) ie. If this 1128 * is the first CSA then initiate the switch. Otherwise we 1129 * track state and trigger completion and/or cancel of the switch. 1130 * XXX should be public for IBSS use 1131 */ 1132static void 1133ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1134 const struct ieee80211_frame *wh) 1135{ 1136 struct ieee80211com *ic = vap->iv_ic; 1137 const struct ieee80211_csa_ie *csa = 1138 (const struct ieee80211_csa_ie *) frm; 1139 1140 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1141 ("state %s", ieee80211_state_name[vap->iv_state])); 1142 1143 if (csa->csa_mode > 1) { 1144 IEEE80211_DISCARD_IE(vap, 1145 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1146 wh, "CSA", "invalid mode %u", csa->csa_mode); 1147 return; 1148 } 1149 IEEE80211_LOCK(ic); 1150 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1151 /* 1152 * Convert the channel number to a channel reference. We 1153 * try first to preserve turbo attribute of the current 1154 * channel then fallback. Note this will not work if the 1155 * CSA specifies a channel that requires a band switch (e.g. 1156 * 11a => 11g). This is intentional as 11h is defined only 1157 * for 5GHz/11a and because the switch does not involve a 1158 * reassociation, protocol state (capabilities, negotated 1159 * rates, etc) may/will be wrong. 1160 */ 1161 struct ieee80211_channel *c = 1162 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1163 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1164 if (c == NULL) { 1165 c = ieee80211_find_channel_byieee(ic, 1166 csa->csa_newchan, 1167 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1168 if (c == NULL) { 1169 IEEE80211_DISCARD_IE(vap, 1170 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1171 wh, "CSA", "invalid channel %u", 1172 csa->csa_newchan); 1173 goto done; 1174 } 1175 } 1176#if IEEE80211_CSA_COUNT_MIN > 0 1177 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1178 /* 1179 * Require at least IEEE80211_CSA_COUNT_MIN count to 1180 * reduce the risk of being redirected by a fabricated 1181 * CSA. If a valid CSA is dropped we'll still get a 1182 * beacon miss when the AP leaves the channel so we'll 1183 * eventually follow to the new channel. 1184 * 1185 * NOTE: this violates the 11h spec that states that 1186 * count may be any value and if 0 then a switch 1187 * should happen asap. 1188 */ 1189 IEEE80211_DISCARD_IE(vap, 1190 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1191 wh, "CSA", "count %u too small, must be >= %u", 1192 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1193 goto done; 1194 } 1195#endif 1196 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1197 } else { 1198 /* 1199 * Validate this ie against the initial CSA. We require 1200 * mode and channel not change and the count must be 1201 * monotonically decreasing. This may be pointless and 1202 * canceling the switch as a result may be too paranoid but 1203 * in the worst case if we drop out of CSA because of this 1204 * and the AP does move then we'll just end up taking a 1205 * beacon miss and scan to find the AP. 1206 * 1207 * XXX may want <= on count as we also process ProbeResp 1208 * frames and those may come in w/ the same count as the 1209 * previous beacon; but doing so leaves us open to a stuck 1210 * count until we add a dead-man timer 1211 */ 1212 if (!(csa->csa_count < ic->ic_csa_count && 1213 csa->csa_mode == ic->ic_csa_mode && 1214 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1215 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1216 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1217 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1218 ic->ic_csa_newchan, ic->ic_csa_count, 1219 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1220 ieee80211_csa_cancelswitch(ic); 1221 } else { 1222 if (csa->csa_count <= 1) 1223 ieee80211_csa_completeswitch(ic); 1224 else 1225 ic->ic_csa_count = csa->csa_count; 1226 } 1227 } 1228done: 1229 IEEE80211_UNLOCK(ic); 1230} 1231 1232/* 1233 * Return non-zero if a background scan may be continued: 1234 * o bg scan is active 1235 * o no channel switch is pending 1236 * o there has not been any traffic recently 1237 * 1238 * Note we do not check if there is an administrative enable; 1239 * this is only done to start the scan. We assume that any 1240 * change in state will be accompanied by a request to cancel 1241 * active scans which will otherwise cause this test to fail. 1242 */ 1243static __inline int 1244contbgscan(struct ieee80211vap *vap) 1245{ 1246 struct ieee80211com *ic = vap->iv_ic; 1247 1248 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1249 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1250 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1251 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1252} 1253 1254/* 1255 * Return non-zero if a backgrond scan may be started: 1256 * o bg scanning is administratively enabled 1257 * o no channel switch is pending 1258 * o we are not boosted on a dynamic turbo channel 1259 * o there has not been a scan recently 1260 * o there has not been any traffic recently 1261 */ 1262static __inline int 1263startbgscan(struct ieee80211vap *vap) 1264{ 1265 struct ieee80211com *ic = vap->iv_ic; 1266 1267 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1268 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1269#ifdef IEEE80211_SUPPORT_SUPERG 1270 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1271#endif 1272 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1273 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1274} 1275 1276static void 1277sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1278 int subtype, int rssi, int nf) 1279{ 1280#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1281#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1282 struct ieee80211vap *vap = ni->ni_vap; 1283 struct ieee80211com *ic = ni->ni_ic; 1284 struct ieee80211_frame *wh; 1285 uint8_t *frm, *efrm; 1286 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1287 uint8_t rate; 1288 int ht_state_change = 0; 1289 1290 wh = mtod(m0, struct ieee80211_frame *); 1291 frm = (uint8_t *)&wh[1]; 1292 efrm = mtod(m0, uint8_t *) + m0->m_len; 1293 switch (subtype) { 1294 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1295 case IEEE80211_FC0_SUBTYPE_BEACON: { 1296 struct ieee80211_scanparams scan; 1297 /* 1298 * We process beacon/probe response frames: 1299 * o when scanning, or 1300 * o station mode when associated (to collect state 1301 * updates such as 802.11g slot time) 1302 * Frames otherwise received are discarded. 1303 */ 1304 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1305 vap->iv_stats.is_rx_mgtdiscard++; 1306 return; 1307 } 1308 /* XXX probe response in sta mode when !scanning? */ 1309 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) { 1310 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1311 vap->iv_stats.is_beacon_bad++; 1312 return; 1313 } 1314 /* 1315 * Count frame now that we know it's to be processed. 1316 */ 1317 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1318 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1319 IEEE80211_NODE_STAT(ni, rx_beacons); 1320 } else 1321 IEEE80211_NODE_STAT(ni, rx_proberesp); 1322 /* 1323 * When operating in station mode, check for state updates. 1324 * Be careful to ignore beacons received while doing a 1325 * background scan. We consider only 11g/WMM stuff right now. 1326 */ 1327 if (ni->ni_associd != 0 && 1328 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1329 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1330 /* record tsf of last beacon */ 1331 memcpy(ni->ni_tstamp.data, scan.tstamp, 1332 sizeof(ni->ni_tstamp)); 1333 /* count beacon frame for s/w bmiss handling */ 1334 vap->iv_swbmiss_count++; 1335 vap->iv_bmiss_count = 0; 1336 if (ni->ni_erp != scan.erp) { 1337 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1338 wh->i_addr2, 1339 "erp change: was 0x%x, now 0x%x", 1340 ni->ni_erp, scan.erp); 1341 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1342 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1343 ic->ic_flags |= IEEE80211_F_USEPROT; 1344 else 1345 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1346 ni->ni_erp = scan.erp; 1347 /* XXX statistic */ 1348 /* XXX driver notification */ 1349 } 1350 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1351 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1352 wh->i_addr2, 1353 "capabilities change: was 0x%x, now 0x%x", 1354 ni->ni_capinfo, scan.capinfo); 1355 /* 1356 * NB: we assume short preamble doesn't 1357 * change dynamically 1358 */ 1359 ieee80211_set_shortslottime(ic, 1360 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1361 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1362 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1363 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1364 /* XXX statistic */ 1365 } 1366 if (scan.wme != NULL && 1367 (ni->ni_flags & IEEE80211_NODE_QOS) && 1368 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1369 ieee80211_wme_updateparams(vap); 1370#ifdef IEEE80211_SUPPORT_SUPERG 1371 if (scan.ath != NULL) 1372 ieee80211_parse_athparams(ni, scan.ath, wh); 1373#endif 1374 if (scan.htcap != NULL && scan.htinfo != NULL && 1375 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1376 /* XXX state changes? */ 1377 if (ieee80211_ht_updateparams(ni, 1378 scan.htcap, scan.htinfo)) 1379 ht_state_change = 1; 1380 } 1381 if (scan.quiet) 1382 ic->ic_set_quiet(ni, scan.quiet); 1383 if (scan.tim != NULL) { 1384 struct ieee80211_tim_ie *tim = 1385 (struct ieee80211_tim_ie *) scan.tim; 1386#if 0 1387 int aid = IEEE80211_AID(ni->ni_associd); 1388 int ix = aid / NBBY; 1389 int min = tim->tim_bitctl &~ 1; 1390 int max = tim->tim_len + min - 4; 1391 if ((tim->tim_bitctl&1) || 1392 (min <= ix && ix <= max && 1393 isset(tim->tim_bitmap - min, aid))) { 1394 /* 1395 * XXX Do not let bg scan kick off 1396 * we are expecting data. 1397 */ 1398 ic->ic_lastdata = ticks; 1399 vap->iv_sta_ps(vap, 0); 1400 } 1401#endif 1402 ni->ni_dtim_count = tim->tim_count; 1403 ni->ni_dtim_period = tim->tim_period; 1404 } 1405 if (scan.csa != NULL && 1406 (vap->iv_flags & IEEE80211_F_DOTH)) 1407 ieee80211_parse_csaparams(vap, scan.csa, wh); 1408 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1409 /* 1410 * No CSA ie or 11h disabled, but a channel 1411 * switch is pending; drop out so we aren't 1412 * stuck in CSA state. If the AP really is 1413 * moving we'll get a beacon miss and scan. 1414 */ 1415 IEEE80211_LOCK(ic); 1416 ieee80211_csa_cancelswitch(ic); 1417 IEEE80211_UNLOCK(ic); 1418 } 1419 /* 1420 * If scanning, pass the info to the scan module. 1421 * Otherwise, check if it's the right time to do 1422 * a background scan. Background scanning must 1423 * be enabled and we must not be operating in the 1424 * turbo phase of dynamic turbo mode. Then, 1425 * it's been a while since the last background 1426 * scan and if no data frames have come through 1427 * recently, kick off a scan. Note that this 1428 * is the mechanism by which a background scan 1429 * is started _and_ continued each time we 1430 * return on-channel to receive a beacon from 1431 * our ap. 1432 */ 1433 if (ic->ic_flags & IEEE80211_F_SCAN) { 1434 ieee80211_add_scan(vap, &scan, wh, 1435 subtype, rssi, nf); 1436 } else if (contbgscan(vap)) { 1437 ieee80211_bg_scan(vap, 0); 1438 } else if (startbgscan(vap)) { 1439 vap->iv_stats.is_scan_bg++; 1440#if 0 1441 /* wakeup if we are sleeing */ 1442 ieee80211_set_pwrsave(vap, 0); 1443#endif 1444 ieee80211_bg_scan(vap, 0); 1445 } 1446 1447 /* 1448 * If we've had a channel width change (eg HT20<->HT40) 1449 * then schedule a delayed driver notification. 1450 */ 1451 if (ht_state_change) 1452 ieee80211_update_chw(ic); 1453 return; 1454 } 1455 /* 1456 * If scanning, just pass information to the scan module. 1457 */ 1458 if (ic->ic_flags & IEEE80211_F_SCAN) { 1459 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1460 /* 1461 * Actively scanning a channel marked passive; 1462 * send a probe request now that we know there 1463 * is 802.11 traffic present. 1464 * 1465 * XXX check if the beacon we recv'd gives 1466 * us what we need and suppress the probe req 1467 */ 1468 ieee80211_probe_curchan(vap, 1); 1469 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1470 } 1471 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1472 return; 1473 } 1474 break; 1475 } 1476 1477 case IEEE80211_FC0_SUBTYPE_AUTH: { 1478 uint16_t algo, seq, status; 1479 /* 1480 * auth frame format 1481 * [2] algorithm 1482 * [2] sequence 1483 * [2] status 1484 * [tlv*] challenge 1485 */ 1486 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1487 algo = le16toh(*(uint16_t *)frm); 1488 seq = le16toh(*(uint16_t *)(frm + 2)); 1489 status = le16toh(*(uint16_t *)(frm + 4)); 1490 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1491 "recv auth frame with algorithm %d seq %d", algo, seq); 1492 1493 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1494 IEEE80211_DISCARD(vap, 1495 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1496 wh, "auth", "%s", "TKIP countermeasures enabled"); 1497 vap->iv_stats.is_rx_auth_countermeasures++; 1498 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1499 ieee80211_send_error(ni, wh->i_addr2, 1500 IEEE80211_FC0_SUBTYPE_AUTH, 1501 IEEE80211_REASON_MIC_FAILURE); 1502 } 1503 return; 1504 } 1505 if (algo == IEEE80211_AUTH_ALG_SHARED) 1506 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1507 seq, status); 1508 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1509 sta_auth_open(ni, wh, rssi, nf, seq, status); 1510 else { 1511 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1512 wh, "auth", "unsupported alg %d", algo); 1513 vap->iv_stats.is_rx_auth_unsupported++; 1514 return; 1515 } 1516 break; 1517 } 1518 1519 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1520 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1521 uint16_t capinfo, associd; 1522 uint16_t status; 1523 1524 if (vap->iv_state != IEEE80211_S_ASSOC) { 1525 vap->iv_stats.is_rx_mgtdiscard++; 1526 return; 1527 } 1528 1529 /* 1530 * asresp frame format 1531 * [2] capability information 1532 * [2] status 1533 * [2] association ID 1534 * [tlv] supported rates 1535 * [tlv] extended supported rates 1536 * [tlv] WME 1537 * [tlv] HT capabilities 1538 * [tlv] HT info 1539 */ 1540 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1541 ni = vap->iv_bss; 1542 capinfo = le16toh(*(uint16_t *)frm); 1543 frm += 2; 1544 status = le16toh(*(uint16_t *)frm); 1545 frm += 2; 1546 if (status != 0) { 1547 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1548 wh->i_addr2, "%sassoc failed (reason %d)", 1549 ISREASSOC(subtype) ? "re" : "", status); 1550 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1551 return; 1552 } 1553 associd = le16toh(*(uint16_t *)frm); 1554 frm += 2; 1555 1556 rates = xrates = wme = htcap = htinfo = NULL; 1557 while (efrm - frm > 1) { 1558 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1559 switch (*frm) { 1560 case IEEE80211_ELEMID_RATES: 1561 rates = frm; 1562 break; 1563 case IEEE80211_ELEMID_XRATES: 1564 xrates = frm; 1565 break; 1566 case IEEE80211_ELEMID_HTCAP: 1567 htcap = frm; 1568 break; 1569 case IEEE80211_ELEMID_HTINFO: 1570 htinfo = frm; 1571 break; 1572 case IEEE80211_ELEMID_VENDOR: 1573 if (iswmeoui(frm)) 1574 wme = frm; 1575 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1576 /* 1577 * Accept pre-draft HT ie's if the 1578 * standard ones have not been seen. 1579 */ 1580 if (ishtcapoui(frm)) { 1581 if (htcap == NULL) 1582 htcap = frm; 1583 } else if (ishtinfooui(frm)) { 1584 if (htinfo == NULL) 1585 htinfo = frm; 1586 } 1587 } 1588 /* XXX Atheros OUI support */ 1589 break; 1590 } 1591 frm += frm[1] + 2; 1592 } 1593 1594 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1595 if (xrates != NULL) 1596 IEEE80211_VERIFY_ELEMENT(xrates, 1597 IEEE80211_RATE_MAXSIZE - rates[1], return); 1598 rate = ieee80211_setup_rates(ni, rates, xrates, 1599 IEEE80211_F_JOIN | 1600 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1601 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1602 if (rate & IEEE80211_RATE_BASIC) { 1603 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1604 wh->i_addr2, 1605 "%sassoc failed (rate set mismatch)", 1606 ISREASSOC(subtype) ? "re" : ""); 1607 vap->iv_stats.is_rx_assoc_norate++; 1608 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1609 IEEE80211_SCAN_FAIL_STATUS); 1610 return; 1611 } 1612 1613 ni->ni_capinfo = capinfo; 1614 ni->ni_associd = associd; 1615 if (ni->ni_jointime == 0) 1616 ni->ni_jointime = time_uptime; 1617 if (wme != NULL && 1618 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1619 ni->ni_flags |= IEEE80211_NODE_QOS; 1620 ieee80211_wme_updateparams(vap); 1621 } else 1622 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1623 /* 1624 * Setup HT state according to the negotiation. 1625 * 1626 * NB: shouldn't need to check if HT use is enabled but some 1627 * ap's send back HT ie's even when we don't indicate we 1628 * are HT capable in our AssocReq. 1629 */ 1630 if (htcap != NULL && htinfo != NULL && 1631 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1632 ieee80211_ht_node_init(ni); 1633 ieee80211_ht_updateparams(ni, htcap, htinfo); 1634 ieee80211_setup_htrates(ni, htcap, 1635 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1636 ieee80211_setup_basic_htrates(ni, htinfo); 1637 ieee80211_node_setuptxparms(ni); 1638 ieee80211_ratectl_node_init(ni); 1639 } else { 1640#ifdef IEEE80211_SUPPORT_SUPERG 1641 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1642 ieee80211_ff_node_init(ni); 1643#endif 1644 } 1645 /* 1646 * Configure state now that we are associated. 1647 * 1648 * XXX may need different/additional driver callbacks? 1649 */ 1650 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1651 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1652 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1653 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1654 } else { 1655 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1656 ic->ic_flags |= IEEE80211_F_USEBARKER; 1657 } 1658 ieee80211_set_shortslottime(ic, 1659 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1660 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1661 /* 1662 * Honor ERP protection. 1663 * 1664 * NB: ni_erp should zero for non-11g operation. 1665 */ 1666 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1667 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1668 ic->ic_flags |= IEEE80211_F_USEPROT; 1669 else 1670 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1671 IEEE80211_NOTE_MAC(vap, 1672 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1673 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1674 ISREASSOC(subtype) ? "re" : "", 1675 IEEE80211_NODE_AID(ni), 1676 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1677 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1678 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1679 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1680 ni->ni_flags & IEEE80211_NODE_HT ? 1681 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1682 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1683 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1684 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1685 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1686 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1687 ", fast-frames" : "", 1688 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1689 ", turbo" : "" 1690 ); 1691 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1692 break; 1693 } 1694 1695 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1696 uint16_t reason; 1697 1698 if (vap->iv_state == IEEE80211_S_SCAN) { 1699 vap->iv_stats.is_rx_mgtdiscard++; 1700 return; 1701 } 1702 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1703 /* NB: can happen when in promiscuous mode */ 1704 vap->iv_stats.is_rx_mgtdiscard++; 1705 break; 1706 } 1707 1708 /* 1709 * deauth frame format 1710 * [2] reason 1711 */ 1712 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1713 reason = le16toh(*(uint16_t *)frm); 1714 1715 vap->iv_stats.is_rx_deauth++; 1716 vap->iv_stats.is_rx_deauth_code = reason; 1717 IEEE80211_NODE_STAT(ni, rx_deauth); 1718 1719 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1720 "recv deauthenticate (reason %d)", reason); 1721 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1722 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1723 break; 1724 } 1725 1726 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1727 uint16_t reason; 1728 1729 if (vap->iv_state != IEEE80211_S_RUN && 1730 vap->iv_state != IEEE80211_S_ASSOC && 1731 vap->iv_state != IEEE80211_S_AUTH) { 1732 vap->iv_stats.is_rx_mgtdiscard++; 1733 return; 1734 } 1735 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1736 /* NB: can happen when in promiscuous mode */ 1737 vap->iv_stats.is_rx_mgtdiscard++; 1738 break; 1739 } 1740 1741 /* 1742 * disassoc frame format 1743 * [2] reason 1744 */ 1745 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1746 reason = le16toh(*(uint16_t *)frm); 1747 1748 vap->iv_stats.is_rx_disassoc++; 1749 vap->iv_stats.is_rx_disassoc_code = reason; 1750 IEEE80211_NODE_STAT(ni, rx_disassoc); 1751 1752 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1753 "recv disassociate (reason %d)", reason); 1754 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1755 break; 1756 } 1757 1758 case IEEE80211_FC0_SUBTYPE_ACTION: 1759 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1760 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1761 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1762 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1763 wh, NULL, "%s", "not for us"); 1764 vap->iv_stats.is_rx_mgtdiscard++; 1765 } else if (vap->iv_state != IEEE80211_S_RUN) { 1766 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1767 wh, NULL, "wrong state %s", 1768 ieee80211_state_name[vap->iv_state]); 1769 vap->iv_stats.is_rx_mgtdiscard++; 1770 } else { 1771 if (ieee80211_parse_action(ni, m0) == 0) 1772 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1773 } 1774 break; 1775 1776 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1777 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1778 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1779 case IEEE80211_FC0_SUBTYPE_ATIM: 1780 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1781 wh, NULL, "%s", "not handled"); 1782 vap->iv_stats.is_rx_mgtdiscard++; 1783 break; 1784 1785 default: 1786 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1787 wh, "mgt", "subtype 0x%x not handled", subtype); 1788 vap->iv_stats.is_rx_badsubtype++; 1789 break; 1790 } 1791#undef ISREASSOC 1792#undef ISPROBE 1793} 1794 1795static void 1796sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1797{ 1798 switch (subtype) { 1799 case IEEE80211_FC0_SUBTYPE_BAR: 1800 ieee80211_recv_bar(ni, m); 1801 break; 1802 } 1803} 1804