ieee80211_sta.c revision 297162
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 297162 2016-03-21 20:39:45Z avos $"); 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#include <net80211/ieee80211_sta.h> 67 68#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 69 70static void sta_vattach(struct ieee80211vap *); 71static void sta_beacon_miss(struct ieee80211vap *); 72static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 73static int sta_input(struct ieee80211_node *, struct mbuf *, 74 const struct ieee80211_rx_stats *, int, int); 75static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 77static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 78 79void 80ieee80211_sta_attach(struct ieee80211com *ic) 81{ 82 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 83} 84 85void 86ieee80211_sta_detach(struct ieee80211com *ic) 87{ 88} 89 90static void 91sta_vdetach(struct ieee80211vap *vap) 92{ 93} 94 95static void 96sta_vattach(struct ieee80211vap *vap) 97{ 98 vap->iv_newstate = sta_newstate; 99 vap->iv_input = sta_input; 100 vap->iv_recv_mgmt = sta_recv_mgmt; 101 vap->iv_recv_ctl = sta_recv_ctl; 102 vap->iv_opdetach = sta_vdetach; 103 vap->iv_bmiss = sta_beacon_miss; 104} 105 106/* 107 * Handle a beacon miss event. The common code filters out 108 * spurious events that can happen when scanning and/or before 109 * reaching RUN state. 110 */ 111static void 112sta_beacon_miss(struct ieee80211vap *vap) 113{ 114 struct ieee80211com *ic = vap->iv_ic; 115 116 IEEE80211_LOCK_ASSERT(ic); 117 118 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 119 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 120 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 121 122 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 123 "beacon miss, mode %s state %s\n", 124 ieee80211_opmode_name[vap->iv_opmode], 125 ieee80211_state_name[vap->iv_state]); 126 127 if (vap->iv_state == IEEE80211_S_CSA) { 128 /* 129 * A Channel Switch is pending; assume we missed the 130 * beacon that would've completed the process and just 131 * force the switch. If we made a mistake we'll not 132 * find the AP on the new channel and fall back to a 133 * normal scan. 134 */ 135 ieee80211_csa_completeswitch(ic); 136 return; 137 } 138 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 139 /* 140 * Send a directed probe req before falling back to a 141 * scan; if we receive a response ic_bmiss_count will 142 * be reset. Some cards mistakenly report beacon miss 143 * so this avoids the expensive scan if the ap is 144 * still there. 145 */ 146 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 147 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 148 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 149 return; 150 } 151 152 callout_stop(&vap->iv_swbmiss); 153 vap->iv_bmiss_count = 0; 154 vap->iv_stats.is_beacon_miss++; 155 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 156#ifdef IEEE80211_SUPPORT_SUPERG 157 struct ieee80211com *ic = vap->iv_ic; 158 159 /* 160 * If we receive a beacon miss interrupt when using 161 * dynamic turbo, attempt to switch modes before 162 * reassociating. 163 */ 164 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 165 ieee80211_dturbo_switch(vap, 166 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 167#endif 168 /* 169 * Try to reassociate before scanning for a new ap. 170 */ 171 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 172 } else { 173 /* 174 * Somebody else is controlling state changes (e.g. 175 * a user-mode app) don't do anything that would 176 * confuse them; just drop into scan mode so they'll 177 * notified of the state change and given control. 178 */ 179 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 180 } 181} 182 183/* 184 * Handle deauth with reason. We retry only for 185 * the cases where we might succeed. Otherwise 186 * we downgrade the ap and scan. 187 */ 188static void 189sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 190{ 191 switch (reason) { 192 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 193 case IEEE80211_STATUS_TIMEOUT: 194 case IEEE80211_REASON_ASSOC_EXPIRE: 195 case IEEE80211_REASON_NOT_AUTHED: 196 case IEEE80211_REASON_NOT_ASSOCED: 197 case IEEE80211_REASON_ASSOC_LEAVE: 198 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 199 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 200 break; 201 default: 202 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 203 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 204 ieee80211_check_scan_current(vap); 205 break; 206 } 207} 208 209/* 210 * IEEE80211_M_STA vap state machine handler. 211 * This routine handles the main states in the 802.11 protocol. 212 */ 213static int 214sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 215{ 216 struct ieee80211com *ic = vap->iv_ic; 217 struct ieee80211_node *ni; 218 enum ieee80211_state ostate; 219 220 IEEE80211_LOCK_ASSERT(ic); 221 222 ostate = vap->iv_state; 223 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 224 __func__, ieee80211_state_name[ostate], 225 ieee80211_state_name[nstate], arg); 226 vap->iv_state = nstate; /* state transition */ 227 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 228 if (ostate != IEEE80211_S_SCAN) 229 ieee80211_cancel_scan(vap); /* background scan */ 230 ni = vap->iv_bss; /* NB: no reference held */ 231 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 232 callout_stop(&vap->iv_swbmiss); 233 switch (nstate) { 234 case IEEE80211_S_INIT: 235 switch (ostate) { 236 case IEEE80211_S_SLEEP: 237 /* XXX wakeup */ 238 /* XXX driver hook to wakeup the hardware? */ 239 case IEEE80211_S_RUN: 240 IEEE80211_SEND_MGMT(ni, 241 IEEE80211_FC0_SUBTYPE_DISASSOC, 242 IEEE80211_REASON_ASSOC_LEAVE); 243 ieee80211_sta_leave(ni); 244 break; 245 case IEEE80211_S_ASSOC: 246 IEEE80211_SEND_MGMT(ni, 247 IEEE80211_FC0_SUBTYPE_DEAUTH, 248 IEEE80211_REASON_AUTH_LEAVE); 249 break; 250 case IEEE80211_S_SCAN: 251 ieee80211_cancel_scan(vap); 252 break; 253 default: 254 break; 255 } 256 if (ostate != IEEE80211_S_INIT) { 257 /* NB: optimize INIT -> INIT case */ 258 ieee80211_reset_bss(vap); 259 } 260 if (vap->iv_auth->ia_detach != NULL) 261 vap->iv_auth->ia_detach(vap); 262 break; 263 case IEEE80211_S_SCAN: 264 switch (ostate) { 265 case IEEE80211_S_INIT: 266 /* 267 * Initiate a scan. We can come here as a result 268 * of an IEEE80211_IOC_SCAN_REQ too in which case 269 * the vap will be marked with IEEE80211_FEXT_SCANREQ 270 * and the scan request parameters will be present 271 * in iv_scanreq. Otherwise we do the default. 272 */ 273 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 274 ieee80211_check_scan(vap, 275 vap->iv_scanreq_flags, 276 vap->iv_scanreq_duration, 277 vap->iv_scanreq_mindwell, 278 vap->iv_scanreq_maxdwell, 279 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 280 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 281 } else 282 ieee80211_check_scan_current(vap); 283 break; 284 case IEEE80211_S_SCAN: 285 case IEEE80211_S_AUTH: 286 case IEEE80211_S_ASSOC: 287 /* 288 * These can happen either because of a timeout 289 * on an assoc/auth response or because of a 290 * change in state that requires a reset. For 291 * the former we're called with a non-zero arg 292 * that is the cause for the failure; pass this 293 * to the scan code so it can update state. 294 * Otherwise trigger a new scan unless we're in 295 * manual roaming mode in which case an application 296 * must issue an explicit scan request. 297 */ 298 if (arg != 0) 299 ieee80211_scan_assoc_fail(vap, 300 vap->iv_bss->ni_macaddr, arg); 301 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 302 ieee80211_check_scan_current(vap); 303 break; 304 case IEEE80211_S_SLEEP: /* beacon miss */ 305 /* 306 * XXX if in sleep we need to wakeup the hardware. 307 */ 308 /* FALLTHROUGH */ 309 case IEEE80211_S_RUN: /* beacon miss */ 310 /* 311 * Beacon miss. Notify user space and if not 312 * under control of a user application (roaming 313 * manual) kick off a scan to re-connect. 314 */ 315 316 ieee80211_sta_leave(ni); 317 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 318 ieee80211_check_scan_current(vap); 319 break; 320 default: 321 goto invalid; 322 } 323 break; 324 case IEEE80211_S_AUTH: 325 switch (ostate) { 326 case IEEE80211_S_INIT: 327 case IEEE80211_S_SCAN: 328 IEEE80211_SEND_MGMT(ni, 329 IEEE80211_FC0_SUBTYPE_AUTH, 1); 330 break; 331 case IEEE80211_S_AUTH: 332 case IEEE80211_S_ASSOC: 333 switch (arg & 0xff) { 334 case IEEE80211_FC0_SUBTYPE_AUTH: 335 /* ??? */ 336 IEEE80211_SEND_MGMT(ni, 337 IEEE80211_FC0_SUBTYPE_AUTH, 2); 338 break; 339 case IEEE80211_FC0_SUBTYPE_DEAUTH: 340 sta_authretry(vap, ni, arg>>8); 341 break; 342 } 343 break; 344 case IEEE80211_S_SLEEP: 345 case IEEE80211_S_RUN: 346 switch (arg & 0xff) { 347 case IEEE80211_FC0_SUBTYPE_AUTH: 348 IEEE80211_SEND_MGMT(ni, 349 IEEE80211_FC0_SUBTYPE_AUTH, 2); 350 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 351 break; 352 case IEEE80211_FC0_SUBTYPE_DEAUTH: 353 ieee80211_sta_leave(ni); 354 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 355 /* try to reauth */ 356 IEEE80211_SEND_MGMT(ni, 357 IEEE80211_FC0_SUBTYPE_AUTH, 1); 358 } 359 break; 360 } 361 break; 362 default: 363 goto invalid; 364 } 365 break; 366 case IEEE80211_S_ASSOC: 367 switch (ostate) { 368 case IEEE80211_S_AUTH: 369 case IEEE80211_S_ASSOC: 370 IEEE80211_SEND_MGMT(ni, 371 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 372 break; 373 case IEEE80211_S_SLEEP: /* cannot happen */ 374 case IEEE80211_S_RUN: 375 ieee80211_sta_leave(ni); 376 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 377 IEEE80211_SEND_MGMT(ni, arg ? 378 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 379 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 380 } 381 break; 382 default: 383 goto invalid; 384 } 385 break; 386 case IEEE80211_S_RUN: 387 if (vap->iv_flags & IEEE80211_F_WPA) { 388 /* XXX validate prerequisites */ 389 } 390 switch (ostate) { 391 case IEEE80211_S_RUN: 392 case IEEE80211_S_CSA: 393 break; 394 case IEEE80211_S_AUTH: /* when join is done in fw */ 395 case IEEE80211_S_ASSOC: 396#ifdef IEEE80211_DEBUG 397 if (ieee80211_msg_debug(vap)) { 398 ieee80211_note(vap, "%s with %s ssid ", 399 (vap->iv_opmode == IEEE80211_M_STA ? 400 "associated" : "synchronized"), 401 ether_sprintf(ni->ni_bssid)); 402 ieee80211_print_essid(vap->iv_bss->ni_essid, 403 ni->ni_esslen); 404 /* XXX MCS/HT */ 405 printf(" channel %d start %uMb\n", 406 ieee80211_chan2ieee(ic, ic->ic_curchan), 407 IEEE80211_RATE2MBS(ni->ni_txrate)); 408 } 409#endif 410 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 411 ieee80211_notify_node_join(ni, 412 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 413 break; 414 case IEEE80211_S_SLEEP: 415 /* Wake up from sleep */ 416 vap->iv_sta_ps(vap, 0); 417 break; 418 default: 419 goto invalid; 420 } 421 ieee80211_sync_curchan(ic); 422 if (ostate != IEEE80211_S_RUN && 423 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 424 /* 425 * Start s/w beacon miss timer for devices w/o 426 * hardware support. We fudge a bit here since 427 * we're doing this in software. 428 */ 429 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 430 2 * vap->iv_bmissthreshold * ni->ni_intval); 431 vap->iv_swbmiss_count = 0; 432 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 433 ieee80211_swbmiss, vap); 434 } 435 /* 436 * When 802.1x is not in use mark the port authorized 437 * at this point so traffic can flow. 438 */ 439 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 440 ieee80211_node_authorize(ni); 441 /* 442 * Fake association when joining an existing bss. 443 * 444 * Don't do this if we're doing SLEEP->RUN. 445 */ 446 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 447 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 448 break; 449 case IEEE80211_S_CSA: 450 if (ostate != IEEE80211_S_RUN) 451 goto invalid; 452 break; 453 case IEEE80211_S_SLEEP: 454 vap->iv_sta_ps(vap, 1); 455 break; 456 default: 457 invalid: 458 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 459 "%s: unexpected state transition %s -> %s\n", __func__, 460 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 461 break; 462 } 463 return 0; 464} 465 466/* 467 * Return non-zero if the frame is an echo of a multicast 468 * frame sent by ourself. The dir is known to be DSTODS. 469 */ 470static __inline int 471isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 472{ 473#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 474#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 475 const uint8_t *sa; 476 477 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 478 479 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 480 return 0; 481 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 482 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 483#undef WH4 484#undef QWH4 485} 486 487/* 488 * Return non-zero if the frame is an echo of a multicast 489 * frame sent by ourself. The dir is known to be FROMDS. 490 */ 491static __inline int 492isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 493{ 494 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 495 496 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 497 return 0; 498 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 499} 500 501/* 502 * Decide if a received management frame should be 503 * printed when debugging is enabled. This filters some 504 * of the less interesting frames that come frequently 505 * (e.g. beacons). 506 */ 507static __inline int 508doprint(struct ieee80211vap *vap, int subtype) 509{ 510 switch (subtype) { 511 case IEEE80211_FC0_SUBTYPE_BEACON: 512 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 513 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 514 return 0; 515 } 516 return 1; 517} 518 519/* 520 * Process a received frame. The node associated with the sender 521 * should be supplied. If nothing was found in the node table then 522 * the caller is assumed to supply a reference to iv_bss instead. 523 * The RSSI and a timestamp are also supplied. The RSSI data is used 524 * during AP scanning to select a AP to associate with; it can have 525 * any units so long as values have consistent units and higher values 526 * mean ``better signal''. The receive timestamp is currently not used 527 * by the 802.11 layer. 528 */ 529static int 530sta_input(struct ieee80211_node *ni, struct mbuf *m, 531 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 532{ 533 struct ieee80211vap *vap = ni->ni_vap; 534 struct ieee80211com *ic = ni->ni_ic; 535 struct ifnet *ifp = vap->iv_ifp; 536 struct ieee80211_frame *wh; 537 struct ieee80211_key *key; 538 struct ether_header *eh; 539 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 540 uint8_t dir, type, subtype, qos; 541 uint8_t *bssid; 542 543 if (m->m_flags & M_AMPDU_MPDU) { 544 /* 545 * Fastpath for A-MPDU reorder q resubmission. Frames 546 * w/ M_AMPDU_MPDU marked have already passed through 547 * here but were received out of order and been held on 548 * the reorder queue. When resubmitted they are marked 549 * with the M_AMPDU_MPDU flag and we can bypass most of 550 * the normal processing. 551 */ 552 wh = mtod(m, struct ieee80211_frame *); 553 type = IEEE80211_FC0_TYPE_DATA; 554 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 555 subtype = IEEE80211_FC0_SUBTYPE_QOS; 556 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 557 goto resubmit_ampdu; 558 } 559 560 KASSERT(ni != NULL, ("null node")); 561 ni->ni_inact = ni->ni_inact_reload; 562 563 type = -1; /* undefined */ 564 565 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 567 ni->ni_macaddr, NULL, 568 "too short (1): len %u", m->m_pkthdr.len); 569 vap->iv_stats.is_rx_tooshort++; 570 goto out; 571 } 572 /* 573 * Bit of a cheat here, we use a pointer for a 3-address 574 * frame format but don't reference fields past outside 575 * ieee80211_frame_min w/o first validating the data is 576 * present. 577 */ 578 wh = mtod(m, struct ieee80211_frame *); 579 580 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 581 IEEE80211_FC0_VERSION_0) { 582 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 583 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 584 wh->i_fc[0], wh->i_fc[1]); 585 vap->iv_stats.is_rx_badversion++; 586 goto err; 587 } 588 589 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 590 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 591 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 592 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 593 bssid = wh->i_addr2; 594 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 595 /* not interested in */ 596 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 597 bssid, NULL, "%s", "not to bss"); 598 vap->iv_stats.is_rx_wrongbss++; 599 goto out; 600 } 601 602 /* 603 * Some devices may be in a promiscuous mode 604 * where they receive frames for multiple station 605 * addresses. 606 * 607 * If we receive a data frame that isn't 608 * destined to our VAP MAC, drop it. 609 * 610 * XXX TODO: This is only enforced when not scanning; 611 * XXX it assumes a software-driven scan will put the NIC 612 * XXX into a "no data frames" mode before setting this 613 * XXX flag. Otherwise it may be possible that we'll still 614 * XXX process data frames whilst scanning. 615 */ 616 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 617 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 619 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 620 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 621 vap->iv_stats.is_rx_wrongbss++; 622 goto out; 623 } 624 625 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 626 ni->ni_noise = nf; 627 if ( IEEE80211_HAS_SEQ(type, subtype) && 628 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 629 uint8_t tid = ieee80211_gettid(wh); 630 if (IEEE80211_QOS_HAS_SEQ(wh) && 631 TID_TO_WME_AC(tid) >= WME_AC_VI) 632 ic->ic_wme.wme_hipri_traffic++; 633 if (! ieee80211_check_rxseq(ni, wh, bssid)) 634 goto out; 635 } 636 } 637 638 switch (type) { 639 case IEEE80211_FC0_TYPE_DATA: 640 hdrspace = ieee80211_hdrspace(ic, wh); 641 if (m->m_len < hdrspace && 642 (m = m_pullup(m, hdrspace)) == NULL) { 643 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 644 ni->ni_macaddr, NULL, 645 "data too short: expecting %u", hdrspace); 646 vap->iv_stats.is_rx_tooshort++; 647 goto out; /* XXX */ 648 } 649 /* 650 * Handle A-MPDU re-ordering. If the frame is to be 651 * processed directly then ieee80211_ampdu_reorder 652 * will return 0; otherwise it has consumed the mbuf 653 * and we should do nothing more with it. 654 */ 655 if ((m->m_flags & M_AMPDU) && 656 (dir == IEEE80211_FC1_DIR_FROMDS || 657 dir == IEEE80211_FC1_DIR_DSTODS) && 658 ieee80211_ampdu_reorder(ni, m) != 0) { 659 m = NULL; 660 goto out; 661 } 662 resubmit_ampdu: 663 if (dir == IEEE80211_FC1_DIR_FROMDS) { 664 if ((ifp->if_flags & IFF_SIMPLEX) && 665 isfromds_mcastecho(vap, wh)) { 666 /* 667 * In IEEE802.11 network, multicast 668 * packets sent from "me" are broadcast 669 * from the AP; silently discard for 670 * SIMPLEX interface. 671 */ 672 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 673 wh, "data", "%s", "multicast echo"); 674 vap->iv_stats.is_rx_mcastecho++; 675 goto out; 676 } 677 if ((vap->iv_flags & IEEE80211_F_DWDS) && 678 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 679 /* 680 * DWDS sta's must drop 3-address mcast frames 681 * as they will be sent separately as a 4-addr 682 * frame. Accepting the 3-addr frame will 683 * confuse the bridge into thinking the sending 684 * sta is located at the end of WDS link. 685 */ 686 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 687 "3-address data", "%s", "DWDS enabled"); 688 vap->iv_stats.is_rx_mcastecho++; 689 goto out; 690 } 691 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 692 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 693 IEEE80211_DISCARD(vap, 694 IEEE80211_MSG_INPUT, wh, "4-address data", 695 "%s", "DWDS not enabled"); 696 vap->iv_stats.is_rx_wrongdir++; 697 goto out; 698 } 699 if ((ifp->if_flags & IFF_SIMPLEX) && 700 isdstods_mcastecho(vap, wh)) { 701 /* 702 * In IEEE802.11 network, multicast 703 * packets sent from "me" are broadcast 704 * from the AP; silently discard for 705 * SIMPLEX interface. 706 */ 707 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 708 "4-address data", "%s", "multicast echo"); 709 vap->iv_stats.is_rx_mcastecho++; 710 goto out; 711 } 712 } else { 713 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 714 "data", "incorrect dir 0x%x", dir); 715 vap->iv_stats.is_rx_wrongdir++; 716 goto out; 717 } 718 719 /* 720 * Handle privacy requirements. Note that we 721 * must not be preempted from here until after 722 * we (potentially) call ieee80211_crypto_demic; 723 * otherwise we may violate assumptions in the 724 * crypto cipher modules used to do delayed update 725 * of replay sequence numbers. 726 */ 727 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 728 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 729 /* 730 * Discard encrypted frames when privacy is off. 731 */ 732 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 733 wh, "WEP", "%s", "PRIVACY off"); 734 vap->iv_stats.is_rx_noprivacy++; 735 IEEE80211_NODE_STAT(ni, rx_noprivacy); 736 goto out; 737 } 738 key = ieee80211_crypto_decap(ni, m, hdrspace); 739 if (key == NULL) { 740 /* NB: stats+msgs handled in crypto_decap */ 741 IEEE80211_NODE_STAT(ni, rx_wepfail); 742 goto out; 743 } 744 wh = mtod(m, struct ieee80211_frame *); 745 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 746 } else { 747 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 748 key = NULL; 749 } 750 751 /* 752 * Save QoS bits for use below--before we strip the header. 753 */ 754 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 755 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 756 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 757 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 758 } else 759 qos = 0; 760 761 /* 762 * Next up, any fragmentation. 763 */ 764 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 765 m = ieee80211_defrag(ni, m, hdrspace); 766 if (m == NULL) { 767 /* Fragment dropped or frame not complete yet */ 768 goto out; 769 } 770 } 771 wh = NULL; /* no longer valid, catch any uses */ 772 773 /* 774 * Next strip any MSDU crypto bits. 775 */ 776 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 777 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 778 ni->ni_macaddr, "data", "%s", "demic error"); 779 vap->iv_stats.is_rx_demicfail++; 780 IEEE80211_NODE_STAT(ni, rx_demicfail); 781 goto out; 782 } 783 784 /* copy to listener after decrypt */ 785 if (ieee80211_radiotap_active_vap(vap)) 786 ieee80211_radiotap_rx(vap, m); 787 need_tap = 0; 788 789 /* 790 * Finally, strip the 802.11 header. 791 */ 792 m = ieee80211_decap(vap, m, hdrspace); 793 if (m == NULL) { 794 /* XXX mask bit to check for both */ 795 /* don't count Null data frames as errors */ 796 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 797 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 798 goto out; 799 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 800 ni->ni_macaddr, "data", "%s", "decap error"); 801 vap->iv_stats.is_rx_decap++; 802 IEEE80211_NODE_STAT(ni, rx_decap); 803 goto err; 804 } 805 eh = mtod(m, struct ether_header *); 806 if (!ieee80211_node_is_authorized(ni)) { 807 /* 808 * Deny any non-PAE frames received prior to 809 * authorization. For open/shared-key 810 * authentication the port is mark authorized 811 * after authentication completes. For 802.1x 812 * the port is not marked authorized by the 813 * authenticator until the handshake has completed. 814 */ 815 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 816 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 817 eh->ether_shost, "data", 818 "unauthorized port: ether type 0x%x len %u", 819 eh->ether_type, m->m_pkthdr.len); 820 vap->iv_stats.is_rx_unauth++; 821 IEEE80211_NODE_STAT(ni, rx_unauth); 822 goto err; 823 } 824 } else { 825 /* 826 * When denying unencrypted frames, discard 827 * any non-PAE frames received without encryption. 828 */ 829 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 830 (key == NULL && (m->m_flags & M_WEP) == 0) && 831 eh->ether_type != htons(ETHERTYPE_PAE)) { 832 /* 833 * Drop unencrypted frames. 834 */ 835 vap->iv_stats.is_rx_unencrypted++; 836 IEEE80211_NODE_STAT(ni, rx_unencrypted); 837 goto out; 838 } 839 } 840 /* XXX require HT? */ 841 if (qos & IEEE80211_QOS_AMSDU) { 842 m = ieee80211_decap_amsdu(ni, m); 843 if (m == NULL) 844 return IEEE80211_FC0_TYPE_DATA; 845 } else { 846#ifdef IEEE80211_SUPPORT_SUPERG 847 m = ieee80211_decap_fastframe(vap, ni, m); 848 if (m == NULL) 849 return IEEE80211_FC0_TYPE_DATA; 850#endif 851 } 852 ieee80211_deliver_data(vap, ni, m); 853 return IEEE80211_FC0_TYPE_DATA; 854 855 case IEEE80211_FC0_TYPE_MGT: 856 vap->iv_stats.is_rx_mgmt++; 857 IEEE80211_NODE_STAT(ni, rx_mgmt); 858 if (dir != IEEE80211_FC1_DIR_NODS) { 859 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 860 wh, "data", "incorrect dir 0x%x", dir); 861 vap->iv_stats.is_rx_wrongdir++; 862 goto err; 863 } 864 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 865 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 866 ni->ni_macaddr, "mgt", "too short: len %u", 867 m->m_pkthdr.len); 868 vap->iv_stats.is_rx_tooshort++; 869 goto out; 870 } 871#ifdef IEEE80211_DEBUG 872 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 873 ieee80211_msg_dumppkts(vap)) { 874 if_printf(ifp, "received %s from %s rssi %d\n", 875 ieee80211_mgt_subtype_name[subtype >> 876 IEEE80211_FC0_SUBTYPE_SHIFT], 877 ether_sprintf(wh->i_addr2), rssi); 878 } 879#endif 880 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 881 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 882 /* 883 * Only shared key auth frames with a challenge 884 * should be encrypted, discard all others. 885 */ 886 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 887 wh, ieee80211_mgt_subtype_name[subtype >> 888 IEEE80211_FC0_SUBTYPE_SHIFT], 889 "%s", "WEP set but not permitted"); 890 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 891 goto out; 892 } 893 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 894 /* 895 * Discard encrypted frames when privacy is off. 896 */ 897 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 898 wh, "mgt", "%s", "WEP set but PRIVACY off"); 899 vap->iv_stats.is_rx_noprivacy++; 900 goto out; 901 } 902 hdrspace = ieee80211_hdrspace(ic, wh); 903 key = ieee80211_crypto_decap(ni, m, hdrspace); 904 if (key == NULL) { 905 /* NB: stats+msgs handled in crypto_decap */ 906 goto out; 907 } 908 wh = mtod(m, struct ieee80211_frame *); 909 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 910 } 911 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 912 goto out; 913 914 case IEEE80211_FC0_TYPE_CTL: 915 vap->iv_stats.is_rx_ctl++; 916 IEEE80211_NODE_STAT(ni, rx_ctrl); 917 vap->iv_recv_ctl(ni, m, subtype); 918 goto out; 919 920 default: 921 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 922 wh, NULL, "bad frame type 0x%x", type); 923 /* should not come here */ 924 break; 925 } 926err: 927 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 928out: 929 if (m != NULL) { 930 if (need_tap && ieee80211_radiotap_active_vap(vap)) 931 ieee80211_radiotap_rx(vap, m); 932 m_freem(m); 933 } 934 return type; 935} 936 937static void 938sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 939 int rssi, int nf, uint16_t seq, uint16_t status) 940{ 941 struct ieee80211vap *vap = ni->ni_vap; 942 943 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 944 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 945 ni->ni_macaddr, "open auth", 946 "bad sta auth mode %u", ni->ni_authmode); 947 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 948 return; 949 } 950 if (vap->iv_state != IEEE80211_S_AUTH || 951 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 952 vap->iv_stats.is_rx_bad_auth++; 953 return; 954 } 955 if (status != 0) { 956 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 957 ni, "open auth failed (reason %d)", status); 958 vap->iv_stats.is_rx_auth_fail++; 959 vap->iv_stats.is_rx_authfail_code = status; 960 ieee80211_new_state(vap, IEEE80211_S_SCAN, 961 IEEE80211_SCAN_FAIL_STATUS); 962 } else 963 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 964} 965 966static void 967sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 968 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 969 uint16_t seq, uint16_t status) 970{ 971 struct ieee80211vap *vap = ni->ni_vap; 972 uint8_t *challenge; 973 int estatus; 974 975 /* 976 * NB: this can happen as we allow pre-shared key 977 * authentication to be enabled w/o wep being turned 978 * on so that configuration of these can be done 979 * in any order. It may be better to enforce the 980 * ordering in which case this check would just be 981 * for sanity/consistency. 982 */ 983 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 984 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 985 ni->ni_macaddr, "shared key auth", 986 "%s", " PRIVACY is disabled"); 987 estatus = IEEE80211_STATUS_ALG; 988 goto bad; 989 } 990 /* 991 * Pre-shared key authentication is evil; accept 992 * it only if explicitly configured (it is supported 993 * mainly for compatibility with clients like OS X). 994 */ 995 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 996 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 997 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 998 ni->ni_macaddr, "shared key auth", 999 "bad sta auth mode %u", ni->ni_authmode); 1000 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1001 estatus = IEEE80211_STATUS_ALG; 1002 goto bad; 1003 } 1004 1005 challenge = NULL; 1006 if (frm + 1 < efrm) { 1007 if ((frm[1] + 2) > (efrm - frm)) { 1008 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1009 ni->ni_macaddr, "shared key auth", 1010 "ie %d/%d too long", 1011 frm[0], (frm[1] + 2) - (efrm - frm)); 1012 vap->iv_stats.is_rx_bad_auth++; 1013 estatus = IEEE80211_STATUS_CHALLENGE; 1014 goto bad; 1015 } 1016 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1017 challenge = frm; 1018 frm += frm[1] + 2; 1019 } 1020 switch (seq) { 1021 case IEEE80211_AUTH_SHARED_CHALLENGE: 1022 case IEEE80211_AUTH_SHARED_RESPONSE: 1023 if (challenge == NULL) { 1024 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1025 ni->ni_macaddr, "shared key auth", 1026 "%s", "no challenge"); 1027 vap->iv_stats.is_rx_bad_auth++; 1028 estatus = IEEE80211_STATUS_CHALLENGE; 1029 goto bad; 1030 } 1031 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1032 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1033 ni->ni_macaddr, "shared key auth", 1034 "bad challenge len %d", challenge[1]); 1035 vap->iv_stats.is_rx_bad_auth++; 1036 estatus = IEEE80211_STATUS_CHALLENGE; 1037 goto bad; 1038 } 1039 default: 1040 break; 1041 } 1042 if (vap->iv_state != IEEE80211_S_AUTH) 1043 return; 1044 switch (seq) { 1045 case IEEE80211_AUTH_SHARED_PASS: 1046 if (ni->ni_challenge != NULL) { 1047 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1048 ni->ni_challenge = NULL; 1049 } 1050 if (status != 0) { 1051 IEEE80211_NOTE_FRAME(vap, 1052 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1053 "shared key auth failed (reason %d)", status); 1054 vap->iv_stats.is_rx_auth_fail++; 1055 vap->iv_stats.is_rx_authfail_code = status; 1056 return; 1057 } 1058 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1059 break; 1060 case IEEE80211_AUTH_SHARED_CHALLENGE: 1061 if (!ieee80211_alloc_challenge(ni)) 1062 return; 1063 /* XXX could optimize by passing recvd challenge */ 1064 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1065 IEEE80211_SEND_MGMT(ni, 1066 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1067 break; 1068 default: 1069 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1070 wh, "shared key auth", "bad seq %d", seq); 1071 vap->iv_stats.is_rx_bad_auth++; 1072 return; 1073 } 1074 return; 1075bad: 1076 /* 1077 * Kick the state machine. This short-circuits 1078 * using the mgt frame timeout to trigger the 1079 * state transition. 1080 */ 1081 if (vap->iv_state == IEEE80211_S_AUTH) 1082 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1083 IEEE80211_SCAN_FAIL_STATUS); 1084} 1085 1086int 1087ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1088 const struct ieee80211_frame *wh) 1089{ 1090#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1091 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1092 u_int len = frm[1], qosinfo; 1093 int i; 1094 1095 if (len < sizeof(struct ieee80211_wme_param)-2) { 1096 IEEE80211_DISCARD_IE(vap, 1097 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1098 wh, "WME", "too short, len %u", len); 1099 return -1; 1100 } 1101 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1102 qosinfo &= WME_QOSINFO_COUNT; 1103 /* XXX do proper check for wraparound */ 1104 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1105 return 0; 1106 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1107 for (i = 0; i < WME_NUM_AC; i++) { 1108 struct wmeParams *wmep = 1109 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1110 /* NB: ACI not used */ 1111 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1112 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1113 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1114 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1115 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1116 frm += 4; 1117 } 1118 wme->wme_wmeChanParams.cap_info = qosinfo; 1119 return 1; 1120#undef MS 1121} 1122 1123/* 1124 * Process 11h Channel Switch Announcement (CSA) ie. If this 1125 * is the first CSA then initiate the switch. Otherwise we 1126 * track state and trigger completion and/or cancel of the switch. 1127 * XXX should be public for IBSS use 1128 */ 1129static void 1130ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1131 const struct ieee80211_frame *wh) 1132{ 1133 struct ieee80211com *ic = vap->iv_ic; 1134 const struct ieee80211_csa_ie *csa = 1135 (const struct ieee80211_csa_ie *) frm; 1136 1137 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1138 ("state %s", ieee80211_state_name[vap->iv_state])); 1139 1140 if (csa->csa_mode > 1) { 1141 IEEE80211_DISCARD_IE(vap, 1142 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1143 wh, "CSA", "invalid mode %u", csa->csa_mode); 1144 return; 1145 } 1146 IEEE80211_LOCK(ic); 1147 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1148 /* 1149 * Convert the channel number to a channel reference. We 1150 * try first to preserve turbo attribute of the current 1151 * channel then fallback. Note this will not work if the 1152 * CSA specifies a channel that requires a band switch (e.g. 1153 * 11a => 11g). This is intentional as 11h is defined only 1154 * for 5GHz/11a and because the switch does not involve a 1155 * reassociation, protocol state (capabilities, negotated 1156 * rates, etc) may/will be wrong. 1157 */ 1158 struct ieee80211_channel *c = 1159 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1160 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1161 if (c == NULL) { 1162 c = ieee80211_find_channel_byieee(ic, 1163 csa->csa_newchan, 1164 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1165 if (c == NULL) { 1166 IEEE80211_DISCARD_IE(vap, 1167 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1168 wh, "CSA", "invalid channel %u", 1169 csa->csa_newchan); 1170 goto done; 1171 } 1172 } 1173#if IEEE80211_CSA_COUNT_MIN > 0 1174 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1175 /* 1176 * Require at least IEEE80211_CSA_COUNT_MIN count to 1177 * reduce the risk of being redirected by a fabricated 1178 * CSA. If a valid CSA is dropped we'll still get a 1179 * beacon miss when the AP leaves the channel so we'll 1180 * eventually follow to the new channel. 1181 * 1182 * NOTE: this violates the 11h spec that states that 1183 * count may be any value and if 0 then a switch 1184 * should happen asap. 1185 */ 1186 IEEE80211_DISCARD_IE(vap, 1187 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1188 wh, "CSA", "count %u too small, must be >= %u", 1189 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1190 goto done; 1191 } 1192#endif 1193 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1194 } else { 1195 /* 1196 * Validate this ie against the initial CSA. We require 1197 * mode and channel not change and the count must be 1198 * monotonically decreasing. This may be pointless and 1199 * canceling the switch as a result may be too paranoid but 1200 * in the worst case if we drop out of CSA because of this 1201 * and the AP does move then we'll just end up taking a 1202 * beacon miss and scan to find the AP. 1203 * 1204 * XXX may want <= on count as we also process ProbeResp 1205 * frames and those may come in w/ the same count as the 1206 * previous beacon; but doing so leaves us open to a stuck 1207 * count until we add a dead-man timer 1208 */ 1209 if (!(csa->csa_count < ic->ic_csa_count && 1210 csa->csa_mode == ic->ic_csa_mode && 1211 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1212 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1213 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1214 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1215 ic->ic_csa_newchan, ic->ic_csa_count, 1216 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1217 ieee80211_csa_cancelswitch(ic); 1218 } else { 1219 if (csa->csa_count <= 1) 1220 ieee80211_csa_completeswitch(ic); 1221 else 1222 ic->ic_csa_count = csa->csa_count; 1223 } 1224 } 1225done: 1226 IEEE80211_UNLOCK(ic); 1227} 1228 1229/* 1230 * Return non-zero if a background scan may be continued: 1231 * o bg scan is active 1232 * o no channel switch is pending 1233 * o there has not been any traffic recently 1234 * 1235 * Note we do not check if there is an administrative enable; 1236 * this is only done to start the scan. We assume that any 1237 * change in state will be accompanied by a request to cancel 1238 * active scans which will otherwise cause this test to fail. 1239 */ 1240static __inline int 1241contbgscan(struct ieee80211vap *vap) 1242{ 1243 struct ieee80211com *ic = vap->iv_ic; 1244 1245 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1246 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1247 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1248 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1249} 1250 1251/* 1252 * Return non-zero if a backgrond scan may be started: 1253 * o bg scanning is administratively enabled 1254 * o no channel switch is pending 1255 * o we are not boosted on a dynamic turbo channel 1256 * o there has not been a scan recently 1257 * o there has not been any traffic recently 1258 */ 1259static __inline int 1260startbgscan(struct ieee80211vap *vap) 1261{ 1262 struct ieee80211com *ic = vap->iv_ic; 1263 1264 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1265 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1266#ifdef IEEE80211_SUPPORT_SUPERG 1267 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1268#endif 1269 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1270 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1271} 1272 1273static void 1274sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1275 const struct ieee80211_rx_stats *rxs, 1276 int rssi, int nf) 1277{ 1278#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1279#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1280 struct ieee80211vap *vap = ni->ni_vap; 1281 struct ieee80211com *ic = ni->ni_ic; 1282 struct ieee80211_channel *rxchan = ic->ic_curchan; 1283 struct ieee80211_frame *wh; 1284 uint8_t *frm, *efrm; 1285 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1286 uint8_t rate; 1287 int ht_state_change = 0; 1288 1289 wh = mtod(m0, struct ieee80211_frame *); 1290 frm = (uint8_t *)&wh[1]; 1291 efrm = mtod(m0, uint8_t *) + m0->m_len; 1292 switch (subtype) { 1293 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1294 case IEEE80211_FC0_SUBTYPE_BEACON: { 1295 struct ieee80211_scanparams scan; 1296 struct ieee80211_channel *c; 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 1309 /* Override RX channel as appropriate */ 1310 if (rxs != NULL) { 1311 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1312 if (c != NULL) 1313 rxchan = c; 1314 } 1315 1316 /* XXX probe response in sta mode when !scanning? */ 1317 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1318 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1319 vap->iv_stats.is_beacon_bad++; 1320 return; 1321 } 1322 1323 /* 1324 * Count frame now that we know it's to be processed. 1325 */ 1326 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1327 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1328 IEEE80211_NODE_STAT(ni, rx_beacons); 1329 } else 1330 IEEE80211_NODE_STAT(ni, rx_proberesp); 1331 /* 1332 * When operating in station mode, check for state updates. 1333 * Be careful to ignore beacons received while doing a 1334 * background scan. We consider only 11g/WMM stuff right now. 1335 */ 1336 if (ni->ni_associd != 0 && 1337 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1338 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1339 /* record tsf of last beacon */ 1340 memcpy(ni->ni_tstamp.data, scan.tstamp, 1341 sizeof(ni->ni_tstamp)); 1342 /* count beacon frame for s/w bmiss handling */ 1343 vap->iv_swbmiss_count++; 1344 vap->iv_bmiss_count = 0; 1345 if (ni->ni_erp != scan.erp) { 1346 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1347 wh->i_addr2, 1348 "erp change: was 0x%x, now 0x%x", 1349 ni->ni_erp, scan.erp); 1350 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1351 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1352 ic->ic_flags |= IEEE80211_F_USEPROT; 1353 else 1354 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1355 ni->ni_erp = scan.erp; 1356 /* XXX statistic */ 1357 /* XXX driver notification */ 1358 } 1359 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1360 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1361 wh->i_addr2, 1362 "capabilities change: was 0x%x, now 0x%x", 1363 ni->ni_capinfo, scan.capinfo); 1364 /* 1365 * NB: we assume short preamble doesn't 1366 * change dynamically 1367 */ 1368 ieee80211_set_shortslottime(ic, 1369 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1370 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1371 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1372 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1373 /* XXX statistic */ 1374 } 1375 if (scan.wme != NULL && 1376 (ni->ni_flags & IEEE80211_NODE_QOS) && 1377 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1378 ieee80211_wme_updateparams(vap); 1379#ifdef IEEE80211_SUPPORT_SUPERG 1380 if (scan.ath != NULL) 1381 ieee80211_parse_athparams(ni, scan.ath, wh); 1382#endif 1383 if (scan.htcap != NULL && scan.htinfo != NULL && 1384 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1385 /* XXX state changes? */ 1386 if (ieee80211_ht_updateparams(ni, 1387 scan.htcap, scan.htinfo)) 1388 ht_state_change = 1; 1389 } 1390 if (scan.quiet) 1391 ic->ic_set_quiet(ni, scan.quiet); 1392 1393 if (scan.tim != NULL) { 1394 struct ieee80211_tim_ie *tim = 1395 (struct ieee80211_tim_ie *) scan.tim; 1396 /* 1397 * XXX Check/debug this code; see if it's about 1398 * the right time to force the VAP awake if we 1399 * receive a frame destined for us? 1400 */ 1401 int aid = IEEE80211_AID(ni->ni_associd); 1402 int ix = aid / NBBY; 1403 int min = tim->tim_bitctl &~ 1; 1404 int max = tim->tim_len + min - 4; 1405 int tim_ucast = 0, tim_mcast = 0; 1406 1407 /* 1408 * Only do this for unicast traffic in the TIM 1409 * The multicast traffic notification for 1410 * the scan notification stuff should occur 1411 * differently. 1412 */ 1413 if (min <= ix && ix <= max && 1414 isset(tim->tim_bitmap - min, aid)) { 1415 tim_ucast = 1; 1416 } 1417 1418 /* 1419 * Do a separate notification 1420 * for the multicast bit being set. 1421 */ 1422 if (tim->tim_bitctl & 1) { 1423 tim_mcast = 1; 1424 } 1425 1426 /* 1427 * If the TIM indicates there's traffic for 1428 * us then get us out of STA mode powersave. 1429 */ 1430 if (tim_ucast == 1) { 1431 1432 /* 1433 * Wake us out of SLEEP state if we're 1434 * in it; and if we're doing bgscan 1435 * then wake us out of STA powersave. 1436 */ 1437 ieee80211_sta_tim_notify(vap, 1); 1438 1439 /* 1440 * This is preventing us from 1441 * continuing a bgscan; because it 1442 * tricks the contbgscan() 1443 * routine to think there's always 1444 * traffic for us. 1445 * 1446 * I think we need both an RX and 1447 * TX ic_lastdata field. 1448 */ 1449 ic->ic_lastdata = ticks; 1450 } 1451 1452 ni->ni_dtim_count = tim->tim_count; 1453 ni->ni_dtim_period = tim->tim_period; 1454 } 1455 if (scan.csa != NULL && 1456 (vap->iv_flags & IEEE80211_F_DOTH)) 1457 ieee80211_parse_csaparams(vap, scan.csa, wh); 1458 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1459 /* 1460 * No CSA ie or 11h disabled, but a channel 1461 * switch is pending; drop out so we aren't 1462 * stuck in CSA state. If the AP really is 1463 * moving we'll get a beacon miss and scan. 1464 */ 1465 IEEE80211_LOCK(ic); 1466 ieee80211_csa_cancelswitch(ic); 1467 IEEE80211_UNLOCK(ic); 1468 } 1469 /* 1470 * If scanning, pass the info to the scan module. 1471 * Otherwise, check if it's the right time to do 1472 * a background scan. Background scanning must 1473 * be enabled and we must not be operating in the 1474 * turbo phase of dynamic turbo mode. Then, 1475 * it's been a while since the last background 1476 * scan and if no data frames have come through 1477 * recently, kick off a scan. Note that this 1478 * is the mechanism by which a background scan 1479 * is started _and_ continued each time we 1480 * return on-channel to receive a beacon from 1481 * our ap. 1482 */ 1483 if (ic->ic_flags & IEEE80211_F_SCAN) { 1484 ieee80211_add_scan(vap, rxchan, 1485 &scan, wh, subtype, rssi, nf); 1486 } else if (contbgscan(vap)) { 1487 ieee80211_bg_scan(vap, 0); 1488 } else if (startbgscan(vap)) { 1489 vap->iv_stats.is_scan_bg++; 1490#if 0 1491 /* wakeup if we are sleeing */ 1492 ieee80211_set_pwrsave(vap, 0); 1493#endif 1494 ieee80211_bg_scan(vap, 0); 1495 } 1496 1497 /* 1498 * Put the station to sleep if we haven't seen 1499 * traffic in a while. 1500 */ 1501 IEEE80211_LOCK(ic); 1502 ieee80211_sta_ps_timer_check(vap); 1503 IEEE80211_UNLOCK(ic); 1504 1505 /* 1506 * If we've had a channel width change (eg HT20<->HT40) 1507 * then schedule a delayed driver notification. 1508 */ 1509 if (ht_state_change) 1510 ieee80211_update_chw(ic); 1511 return; 1512 } 1513 /* 1514 * If scanning, just pass information to the scan module. 1515 */ 1516 if (ic->ic_flags & IEEE80211_F_SCAN) { 1517 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1518 /* 1519 * Actively scanning a channel marked passive; 1520 * send a probe request now that we know there 1521 * is 802.11 traffic present. 1522 * 1523 * XXX check if the beacon we recv'd gives 1524 * us what we need and suppress the probe req 1525 */ 1526 ieee80211_probe_curchan(vap, 1); 1527 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1528 } 1529 ieee80211_add_scan(vap, rxchan, &scan, wh, 1530 subtype, rssi, nf); 1531 return; 1532 } 1533 break; 1534 } 1535 1536 case IEEE80211_FC0_SUBTYPE_AUTH: { 1537 uint16_t algo, seq, status; 1538 /* 1539 * auth frame format 1540 * [2] algorithm 1541 * [2] sequence 1542 * [2] status 1543 * [tlv*] challenge 1544 */ 1545 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1546 algo = le16toh(*(uint16_t *)frm); 1547 seq = le16toh(*(uint16_t *)(frm + 2)); 1548 status = le16toh(*(uint16_t *)(frm + 4)); 1549 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1550 "recv auth frame with algorithm %d seq %d", algo, seq); 1551 1552 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1553 IEEE80211_DISCARD(vap, 1554 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1555 wh, "auth", "%s", "TKIP countermeasures enabled"); 1556 vap->iv_stats.is_rx_auth_countermeasures++; 1557 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1558 ieee80211_send_error(ni, wh->i_addr2, 1559 IEEE80211_FC0_SUBTYPE_AUTH, 1560 IEEE80211_REASON_MIC_FAILURE); 1561 } 1562 return; 1563 } 1564 if (algo == IEEE80211_AUTH_ALG_SHARED) 1565 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1566 seq, status); 1567 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1568 sta_auth_open(ni, wh, rssi, nf, seq, status); 1569 else { 1570 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1571 wh, "auth", "unsupported alg %d", algo); 1572 vap->iv_stats.is_rx_auth_unsupported++; 1573 return; 1574 } 1575 break; 1576 } 1577 1578 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1579 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1580 uint16_t capinfo, associd; 1581 uint16_t status; 1582 1583 if (vap->iv_state != IEEE80211_S_ASSOC) { 1584 vap->iv_stats.is_rx_mgtdiscard++; 1585 return; 1586 } 1587 1588 /* 1589 * asresp frame format 1590 * [2] capability information 1591 * [2] status 1592 * [2] association ID 1593 * [tlv] supported rates 1594 * [tlv] extended supported rates 1595 * [tlv] WME 1596 * [tlv] HT capabilities 1597 * [tlv] HT info 1598 */ 1599 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1600 ni = vap->iv_bss; 1601 capinfo = le16toh(*(uint16_t *)frm); 1602 frm += 2; 1603 status = le16toh(*(uint16_t *)frm); 1604 frm += 2; 1605 if (status != 0) { 1606 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1607 wh->i_addr2, "%sassoc failed (reason %d)", 1608 ISREASSOC(subtype) ? "re" : "", status); 1609 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1610 return; 1611 } 1612 associd = le16toh(*(uint16_t *)frm); 1613 frm += 2; 1614 1615 rates = xrates = wme = htcap = htinfo = NULL; 1616 while (efrm - frm > 1) { 1617 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1618 switch (*frm) { 1619 case IEEE80211_ELEMID_RATES: 1620 rates = frm; 1621 break; 1622 case IEEE80211_ELEMID_XRATES: 1623 xrates = frm; 1624 break; 1625 case IEEE80211_ELEMID_HTCAP: 1626 htcap = frm; 1627 break; 1628 case IEEE80211_ELEMID_HTINFO: 1629 htinfo = frm; 1630 break; 1631 case IEEE80211_ELEMID_VENDOR: 1632 if (iswmeoui(frm)) 1633 wme = frm; 1634 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1635 /* 1636 * Accept pre-draft HT ie's if the 1637 * standard ones have not been seen. 1638 */ 1639 if (ishtcapoui(frm)) { 1640 if (htcap == NULL) 1641 htcap = frm; 1642 } else if (ishtinfooui(frm)) { 1643 if (htinfo == NULL) 1644 htinfo = frm; 1645 } 1646 } 1647 /* XXX Atheros OUI support */ 1648 break; 1649 } 1650 frm += frm[1] + 2; 1651 } 1652 1653 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1654 if (xrates != NULL) 1655 IEEE80211_VERIFY_ELEMENT(xrates, 1656 IEEE80211_RATE_MAXSIZE - rates[1], return); 1657 rate = ieee80211_setup_rates(ni, rates, xrates, 1658 IEEE80211_F_JOIN | 1659 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1660 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1661 if (rate & IEEE80211_RATE_BASIC) { 1662 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1663 wh->i_addr2, 1664 "%sassoc failed (rate set mismatch)", 1665 ISREASSOC(subtype) ? "re" : ""); 1666 vap->iv_stats.is_rx_assoc_norate++; 1667 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1668 IEEE80211_SCAN_FAIL_STATUS); 1669 return; 1670 } 1671 1672 ni->ni_capinfo = capinfo; 1673 ni->ni_associd = associd; 1674 if (ni->ni_jointime == 0) 1675 ni->ni_jointime = time_uptime; 1676 if (wme != NULL && 1677 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1678 ni->ni_flags |= IEEE80211_NODE_QOS; 1679 ieee80211_wme_updateparams(vap); 1680 } else 1681 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1682 /* 1683 * Setup HT state according to the negotiation. 1684 * 1685 * NB: shouldn't need to check if HT use is enabled but some 1686 * ap's send back HT ie's even when we don't indicate we 1687 * are HT capable in our AssocReq. 1688 */ 1689 if (htcap != NULL && htinfo != NULL && 1690 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1691 ieee80211_ht_node_init(ni); 1692 ieee80211_ht_updateparams(ni, htcap, htinfo); 1693 ieee80211_setup_htrates(ni, htcap, 1694 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1695 ieee80211_setup_basic_htrates(ni, htinfo); 1696 ieee80211_node_setuptxparms(ni); 1697 ieee80211_ratectl_node_init(ni); 1698 } else { 1699#ifdef IEEE80211_SUPPORT_SUPERG 1700 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1701 ieee80211_ff_node_init(ni); 1702#endif 1703 } 1704 /* 1705 * Configure state now that we are associated. 1706 * 1707 * XXX may need different/additional driver callbacks? 1708 */ 1709 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1710 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1711 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1712 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1713 } else { 1714 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1715 ic->ic_flags |= IEEE80211_F_USEBARKER; 1716 } 1717 ieee80211_set_shortslottime(ic, 1718 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1719 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1720 /* 1721 * Honor ERP protection. 1722 * 1723 * NB: ni_erp should zero for non-11g operation. 1724 */ 1725 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1726 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1727 ic->ic_flags |= IEEE80211_F_USEPROT; 1728 else 1729 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1730 IEEE80211_NOTE_MAC(vap, 1731 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1732 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1733 ISREASSOC(subtype) ? "re" : "", 1734 IEEE80211_NODE_AID(ni), 1735 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1736 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1737 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1738 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1739 ni->ni_flags & IEEE80211_NODE_HT ? 1740 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1741 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1742 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1743 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1744 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1745 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1746 ", fast-frames" : "", 1747 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1748 ", turbo" : "" 1749 ); 1750 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1751 break; 1752 } 1753 1754 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1755 uint16_t reason; 1756 1757 if (vap->iv_state == IEEE80211_S_SCAN) { 1758 vap->iv_stats.is_rx_mgtdiscard++; 1759 return; 1760 } 1761 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1762 /* NB: can happen when in promiscuous mode */ 1763 vap->iv_stats.is_rx_mgtdiscard++; 1764 break; 1765 } 1766 1767 /* 1768 * deauth frame format 1769 * [2] reason 1770 */ 1771 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1772 reason = le16toh(*(uint16_t *)frm); 1773 1774 vap->iv_stats.is_rx_deauth++; 1775 vap->iv_stats.is_rx_deauth_code = reason; 1776 IEEE80211_NODE_STAT(ni, rx_deauth); 1777 1778 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1779 "recv deauthenticate (reason %d)", reason); 1780 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1781 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1782 break; 1783 } 1784 1785 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1786 uint16_t reason; 1787 1788 if (vap->iv_state != IEEE80211_S_RUN && 1789 vap->iv_state != IEEE80211_S_ASSOC && 1790 vap->iv_state != IEEE80211_S_AUTH) { 1791 vap->iv_stats.is_rx_mgtdiscard++; 1792 return; 1793 } 1794 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1795 /* NB: can happen when in promiscuous mode */ 1796 vap->iv_stats.is_rx_mgtdiscard++; 1797 break; 1798 } 1799 1800 /* 1801 * disassoc frame format 1802 * [2] reason 1803 */ 1804 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1805 reason = le16toh(*(uint16_t *)frm); 1806 1807 vap->iv_stats.is_rx_disassoc++; 1808 vap->iv_stats.is_rx_disassoc_code = reason; 1809 IEEE80211_NODE_STAT(ni, rx_disassoc); 1810 1811 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1812 "recv disassociate (reason %d)", reason); 1813 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1814 break; 1815 } 1816 1817 case IEEE80211_FC0_SUBTYPE_ACTION: 1818 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1819 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1820 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1821 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1822 wh, NULL, "%s", "not for us"); 1823 vap->iv_stats.is_rx_mgtdiscard++; 1824 } else if (vap->iv_state != IEEE80211_S_RUN) { 1825 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1826 wh, NULL, "wrong state %s", 1827 ieee80211_state_name[vap->iv_state]); 1828 vap->iv_stats.is_rx_mgtdiscard++; 1829 } else { 1830 if (ieee80211_parse_action(ni, m0) == 0) 1831 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1832 } 1833 break; 1834 1835 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1836 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1837 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1838 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1839 case IEEE80211_FC0_SUBTYPE_ATIM: 1840 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1841 wh, NULL, "%s", "not handled"); 1842 vap->iv_stats.is_rx_mgtdiscard++; 1843 break; 1844 1845 default: 1846 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1847 wh, "mgt", "subtype 0x%x not handled", subtype); 1848 vap->iv_stats.is_rx_badsubtype++; 1849 break; 1850 } 1851#undef ISREASSOC 1852#undef ISPROBE 1853} 1854 1855static void 1856sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1857{ 1858 switch (subtype) { 1859 case IEEE80211_FC0_SUBTYPE_BAR: 1860 ieee80211_recv_bar(ni, m); 1861 break; 1862 } 1863} 1864