ieee80211_sta.c revision 296355
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 296355 2016-03-03 19:53:46Z 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_RUN: 345 switch (arg & 0xff) { 346 case IEEE80211_FC0_SUBTYPE_AUTH: 347 IEEE80211_SEND_MGMT(ni, 348 IEEE80211_FC0_SUBTYPE_AUTH, 2); 349 vap->iv_state = ostate; /* stay RUN */ 350 break; 351 case IEEE80211_FC0_SUBTYPE_DEAUTH: 352 ieee80211_sta_leave(ni); 353 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 354 /* try to reauth */ 355 IEEE80211_SEND_MGMT(ni, 356 IEEE80211_FC0_SUBTYPE_AUTH, 1); 357 } 358 break; 359 } 360 break; 361 default: 362 goto invalid; 363 } 364 break; 365 case IEEE80211_S_ASSOC: 366 switch (ostate) { 367 case IEEE80211_S_AUTH: 368 case IEEE80211_S_ASSOC: 369 IEEE80211_SEND_MGMT(ni, 370 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 371 break; 372 case IEEE80211_S_SLEEP: /* cannot happen */ 373 case IEEE80211_S_RUN: 374 ieee80211_sta_leave(ni); 375 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 376 IEEE80211_SEND_MGMT(ni, arg ? 377 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 378 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 379 } 380 break; 381 default: 382 goto invalid; 383 } 384 break; 385 case IEEE80211_S_RUN: 386 if (vap->iv_flags & IEEE80211_F_WPA) { 387 /* XXX validate prerequisites */ 388 } 389 switch (ostate) { 390 case IEEE80211_S_RUN: 391 case IEEE80211_S_CSA: 392 break; 393 case IEEE80211_S_AUTH: /* when join is done in fw */ 394 case IEEE80211_S_ASSOC: 395#ifdef IEEE80211_DEBUG 396 if (ieee80211_msg_debug(vap)) { 397 ieee80211_note(vap, "%s with %s ssid ", 398 (vap->iv_opmode == IEEE80211_M_STA ? 399 "associated" : "synchronized"), 400 ether_sprintf(ni->ni_bssid)); 401 ieee80211_print_essid(vap->iv_bss->ni_essid, 402 ni->ni_esslen); 403 /* XXX MCS/HT */ 404 printf(" channel %d start %uMb\n", 405 ieee80211_chan2ieee(ic, ic->ic_curchan), 406 IEEE80211_RATE2MBS(ni->ni_txrate)); 407 } 408#endif 409 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 410 ieee80211_notify_node_join(ni, 411 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 412 break; 413 case IEEE80211_S_SLEEP: 414 /* Wake up from sleep */ 415 vap->iv_sta_ps(vap, 0); 416 break; 417 default: 418 goto invalid; 419 } 420 ieee80211_sync_curchan(ic); 421 if (ostate != IEEE80211_S_RUN && 422 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 423 /* 424 * Start s/w beacon miss timer for devices w/o 425 * hardware support. We fudge a bit here since 426 * we're doing this in software. 427 */ 428 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 429 2 * vap->iv_bmissthreshold * ni->ni_intval); 430 vap->iv_swbmiss_count = 0; 431 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 432 ieee80211_swbmiss, vap); 433 } 434 /* 435 * When 802.1x is not in use mark the port authorized 436 * at this point so traffic can flow. 437 */ 438 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 439 ieee80211_node_authorize(ni); 440 /* 441 * Fake association when joining an existing bss. 442 * 443 * Don't do this if we're doing SLEEP->RUN. 444 */ 445 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 446 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 447 break; 448 case IEEE80211_S_CSA: 449 if (ostate != IEEE80211_S_RUN) 450 goto invalid; 451 break; 452 case IEEE80211_S_SLEEP: 453 vap->iv_sta_ps(vap, 1); 454 break; 455 default: 456 invalid: 457 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 458 "%s: unexpected state transition %s -> %s\n", __func__, 459 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 460 break; 461 } 462 return 0; 463} 464 465/* 466 * Return non-zero if the frame is an echo of a multicast 467 * frame sent by ourself. The dir is known to be DSTODS. 468 */ 469static __inline int 470isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 471{ 472#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 473#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 474 const uint8_t *sa; 475 476 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 477 478 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 479 return 0; 480 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 481 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 482#undef WH4 483#undef QWH4 484} 485 486/* 487 * Return non-zero if the frame is an echo of a multicast 488 * frame sent by ourself. The dir is known to be FROMDS. 489 */ 490static __inline int 491isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 492{ 493 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 494 495 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 496 return 0; 497 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 498} 499 500/* 501 * Decide if a received management frame should be 502 * printed when debugging is enabled. This filters some 503 * of the less interesting frames that come frequently 504 * (e.g. beacons). 505 */ 506static __inline int 507doprint(struct ieee80211vap *vap, int subtype) 508{ 509 switch (subtype) { 510 case IEEE80211_FC0_SUBTYPE_BEACON: 511 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 512 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 513 return 0; 514 } 515 return 1; 516} 517 518/* 519 * Process a received frame. The node associated with the sender 520 * should be supplied. If nothing was found in the node table then 521 * the caller is assumed to supply a reference to iv_bss instead. 522 * The RSSI and a timestamp are also supplied. The RSSI data is used 523 * during AP scanning to select a AP to associate with; it can have 524 * any units so long as values have consistent units and higher values 525 * mean ``better signal''. The receive timestamp is currently not used 526 * by the 802.11 layer. 527 */ 528static int 529sta_input(struct ieee80211_node *ni, struct mbuf *m, 530 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 531{ 532 struct ieee80211vap *vap = ni->ni_vap; 533 struct ieee80211com *ic = ni->ni_ic; 534 struct ifnet *ifp = vap->iv_ifp; 535 struct ieee80211_frame *wh; 536 struct ieee80211_key *key; 537 struct ether_header *eh; 538 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 539 uint8_t dir, type, subtype, qos; 540 uint8_t *bssid; 541 542 if (m->m_flags & M_AMPDU_MPDU) { 543 /* 544 * Fastpath for A-MPDU reorder q resubmission. Frames 545 * w/ M_AMPDU_MPDU marked have already passed through 546 * here but were received out of order and been held on 547 * the reorder queue. When resubmitted they are marked 548 * with the M_AMPDU_MPDU flag and we can bypass most of 549 * the normal processing. 550 */ 551 wh = mtod(m, struct ieee80211_frame *); 552 type = IEEE80211_FC0_TYPE_DATA; 553 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 554 subtype = IEEE80211_FC0_SUBTYPE_QOS; 555 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 556 goto resubmit_ampdu; 557 } 558 559 KASSERT(ni != NULL, ("null node")); 560 ni->ni_inact = ni->ni_inact_reload; 561 562 type = -1; /* undefined */ 563 564 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 565 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 566 ni->ni_macaddr, NULL, 567 "too short (1): len %u", m->m_pkthdr.len); 568 vap->iv_stats.is_rx_tooshort++; 569 goto out; 570 } 571 /* 572 * Bit of a cheat here, we use a pointer for a 3-address 573 * frame format but don't reference fields past outside 574 * ieee80211_frame_min w/o first validating the data is 575 * present. 576 */ 577 wh = mtod(m, struct ieee80211_frame *); 578 579 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 580 IEEE80211_FC0_VERSION_0) { 581 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 582 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 583 wh->i_fc[0], wh->i_fc[1]); 584 vap->iv_stats.is_rx_badversion++; 585 goto err; 586 } 587 588 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 589 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 590 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 591 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 592 bssid = wh->i_addr2; 593 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 594 /* not interested in */ 595 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 596 bssid, NULL, "%s", "not to bss"); 597 vap->iv_stats.is_rx_wrongbss++; 598 goto out; 599 } 600 601 /* 602 * Some devices may be in a promiscuous mode 603 * where they receive frames for multiple station 604 * addresses. 605 * 606 * If we receive a data frame that isn't 607 * destined to our VAP MAC, drop it. 608 * 609 * XXX TODO: This is only enforced when not scanning; 610 * XXX it assumes a software-driven scan will put the NIC 611 * XXX into a "no data frames" mode before setting this 612 * XXX flag. Otherwise it may be possible that we'll still 613 * XXX process data frames whilst scanning. 614 */ 615 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 616 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 617 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 618 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 619 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 620 vap->iv_stats.is_rx_wrongbss++; 621 goto out; 622 } 623 624 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 625 ni->ni_noise = nf; 626 if ( IEEE80211_HAS_SEQ(type, subtype) && 627 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 628 uint8_t tid = ieee80211_gettid(wh); 629 if (IEEE80211_QOS_HAS_SEQ(wh) && 630 TID_TO_WME_AC(tid) >= WME_AC_VI) 631 ic->ic_wme.wme_hipri_traffic++; 632 if (! ieee80211_check_rxseq(ni, wh, bssid)) 633 goto out; 634 } 635 } 636 637 switch (type) { 638 case IEEE80211_FC0_TYPE_DATA: 639 hdrspace = ieee80211_hdrspace(ic, wh); 640 if (m->m_len < hdrspace && 641 (m = m_pullup(m, hdrspace)) == NULL) { 642 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 643 ni->ni_macaddr, NULL, 644 "data too short: expecting %u", hdrspace); 645 vap->iv_stats.is_rx_tooshort++; 646 goto out; /* XXX */ 647 } 648 /* 649 * Handle A-MPDU re-ordering. If the frame is to be 650 * processed directly then ieee80211_ampdu_reorder 651 * will return 0; otherwise it has consumed the mbuf 652 * and we should do nothing more with it. 653 */ 654 if ((m->m_flags & M_AMPDU) && 655 (dir == IEEE80211_FC1_DIR_FROMDS || 656 dir == IEEE80211_FC1_DIR_DSTODS) && 657 ieee80211_ampdu_reorder(ni, m) != 0) { 658 m = NULL; 659 goto out; 660 } 661 resubmit_ampdu: 662 if (dir == IEEE80211_FC1_DIR_FROMDS) { 663 if ((ifp->if_flags & IFF_SIMPLEX) && 664 isfromds_mcastecho(vap, wh)) { 665 /* 666 * In IEEE802.11 network, multicast 667 * packets sent from "me" are broadcast 668 * from the AP; silently discard for 669 * SIMPLEX interface. 670 */ 671 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 672 wh, "data", "%s", "multicast echo"); 673 vap->iv_stats.is_rx_mcastecho++; 674 goto out; 675 } 676 if ((vap->iv_flags & IEEE80211_F_DWDS) && 677 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 678 /* 679 * DWDS sta's must drop 3-address mcast frames 680 * as they will be sent separately as a 4-addr 681 * frame. Accepting the 3-addr frame will 682 * confuse the bridge into thinking the sending 683 * sta is located at the end of WDS link. 684 */ 685 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 686 "3-address data", "%s", "DWDS enabled"); 687 vap->iv_stats.is_rx_mcastecho++; 688 goto out; 689 } 690 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 691 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 692 IEEE80211_DISCARD(vap, 693 IEEE80211_MSG_INPUT, wh, "4-address data", 694 "%s", "DWDS not enabled"); 695 vap->iv_stats.is_rx_wrongdir++; 696 goto out; 697 } 698 if ((ifp->if_flags & IFF_SIMPLEX) && 699 isdstods_mcastecho(vap, wh)) { 700 /* 701 * In IEEE802.11 network, multicast 702 * packets sent from "me" are broadcast 703 * from the AP; silently discard for 704 * SIMPLEX interface. 705 */ 706 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 707 "4-address data", "%s", "multicast echo"); 708 vap->iv_stats.is_rx_mcastecho++; 709 goto out; 710 } 711 } else { 712 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 713 "data", "incorrect dir 0x%x", dir); 714 vap->iv_stats.is_rx_wrongdir++; 715 goto out; 716 } 717 718 /* 719 * Handle privacy requirements. Note that we 720 * must not be preempted from here until after 721 * we (potentially) call ieee80211_crypto_demic; 722 * otherwise we may violate assumptions in the 723 * crypto cipher modules used to do delayed update 724 * of replay sequence numbers. 725 */ 726 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 727 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 728 /* 729 * Discard encrypted frames when privacy is off. 730 */ 731 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 732 wh, "WEP", "%s", "PRIVACY off"); 733 vap->iv_stats.is_rx_noprivacy++; 734 IEEE80211_NODE_STAT(ni, rx_noprivacy); 735 goto out; 736 } 737 key = ieee80211_crypto_decap(ni, m, hdrspace); 738 if (key == NULL) { 739 /* NB: stats+msgs handled in crypto_decap */ 740 IEEE80211_NODE_STAT(ni, rx_wepfail); 741 goto out; 742 } 743 wh = mtod(m, struct ieee80211_frame *); 744 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 745 } else { 746 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 747 key = NULL; 748 } 749 750 /* 751 * Save QoS bits for use below--before we strip the header. 752 */ 753 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 754 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 755 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 756 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 757 } else 758 qos = 0; 759 760 /* 761 * Next up, any fragmentation. 762 */ 763 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 764 m = ieee80211_defrag(ni, m, hdrspace); 765 if (m == NULL) { 766 /* Fragment dropped or frame not complete yet */ 767 goto out; 768 } 769 } 770 wh = NULL; /* no longer valid, catch any uses */ 771 772 /* 773 * Next strip any MSDU crypto bits. 774 */ 775 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 776 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 777 ni->ni_macaddr, "data", "%s", "demic error"); 778 vap->iv_stats.is_rx_demicfail++; 779 IEEE80211_NODE_STAT(ni, rx_demicfail); 780 goto out; 781 } 782 783 /* copy to listener after decrypt */ 784 if (ieee80211_radiotap_active_vap(vap)) 785 ieee80211_radiotap_rx(vap, m); 786 need_tap = 0; 787 788 /* 789 * Finally, strip the 802.11 header. 790 */ 791 m = ieee80211_decap(vap, m, hdrspace); 792 if (m == NULL) { 793 /* XXX mask bit to check for both */ 794 /* don't count Null data frames as errors */ 795 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 796 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 797 goto out; 798 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 799 ni->ni_macaddr, "data", "%s", "decap error"); 800 vap->iv_stats.is_rx_decap++; 801 IEEE80211_NODE_STAT(ni, rx_decap); 802 goto err; 803 } 804 eh = mtod(m, struct ether_header *); 805 if (!ieee80211_node_is_authorized(ni)) { 806 /* 807 * Deny any non-PAE frames received prior to 808 * authorization. For open/shared-key 809 * authentication the port is mark authorized 810 * after authentication completes. For 802.1x 811 * the port is not marked authorized by the 812 * authenticator until the handshake has completed. 813 */ 814 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 815 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 816 eh->ether_shost, "data", 817 "unauthorized port: ether type 0x%x len %u", 818 eh->ether_type, m->m_pkthdr.len); 819 vap->iv_stats.is_rx_unauth++; 820 IEEE80211_NODE_STAT(ni, rx_unauth); 821 goto err; 822 } 823 } else { 824 /* 825 * When denying unencrypted frames, discard 826 * any non-PAE frames received without encryption. 827 */ 828 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 829 (key == NULL && (m->m_flags & M_WEP) == 0) && 830 eh->ether_type != htons(ETHERTYPE_PAE)) { 831 /* 832 * Drop unencrypted frames. 833 */ 834 vap->iv_stats.is_rx_unencrypted++; 835 IEEE80211_NODE_STAT(ni, rx_unencrypted); 836 goto out; 837 } 838 } 839 /* XXX require HT? */ 840 if (qos & IEEE80211_QOS_AMSDU) { 841 m = ieee80211_decap_amsdu(ni, m); 842 if (m == NULL) 843 return IEEE80211_FC0_TYPE_DATA; 844 } else { 845#ifdef IEEE80211_SUPPORT_SUPERG 846 m = ieee80211_decap_fastframe(vap, ni, m); 847 if (m == NULL) 848 return IEEE80211_FC0_TYPE_DATA; 849#endif 850 } 851 ieee80211_deliver_data(vap, ni, m); 852 return IEEE80211_FC0_TYPE_DATA; 853 854 case IEEE80211_FC0_TYPE_MGT: 855 vap->iv_stats.is_rx_mgmt++; 856 IEEE80211_NODE_STAT(ni, rx_mgmt); 857 if (dir != IEEE80211_FC1_DIR_NODS) { 858 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 859 wh, "data", "incorrect dir 0x%x", dir); 860 vap->iv_stats.is_rx_wrongdir++; 861 goto err; 862 } 863 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 864 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 865 ni->ni_macaddr, "mgt", "too short: len %u", 866 m->m_pkthdr.len); 867 vap->iv_stats.is_rx_tooshort++; 868 goto out; 869 } 870#ifdef IEEE80211_DEBUG 871 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 872 ieee80211_msg_dumppkts(vap)) { 873 if_printf(ifp, "received %s from %s rssi %d\n", 874 ieee80211_mgt_subtype_name[subtype >> 875 IEEE80211_FC0_SUBTYPE_SHIFT], 876 ether_sprintf(wh->i_addr2), rssi); 877 } 878#endif 879 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 880 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 881 /* 882 * Only shared key auth frames with a challenge 883 * should be encrypted, discard all others. 884 */ 885 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 886 wh, ieee80211_mgt_subtype_name[subtype >> 887 IEEE80211_FC0_SUBTYPE_SHIFT], 888 "%s", "WEP set but not permitted"); 889 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 890 goto out; 891 } 892 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 893 /* 894 * Discard encrypted frames when privacy is off. 895 */ 896 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 897 wh, "mgt", "%s", "WEP set but PRIVACY off"); 898 vap->iv_stats.is_rx_noprivacy++; 899 goto out; 900 } 901 hdrspace = ieee80211_hdrspace(ic, wh); 902 key = ieee80211_crypto_decap(ni, m, hdrspace); 903 if (key == NULL) { 904 /* NB: stats+msgs handled in crypto_decap */ 905 goto out; 906 } 907 wh = mtod(m, struct ieee80211_frame *); 908 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 909 } 910 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 911 goto out; 912 913 case IEEE80211_FC0_TYPE_CTL: 914 vap->iv_stats.is_rx_ctl++; 915 IEEE80211_NODE_STAT(ni, rx_ctrl); 916 vap->iv_recv_ctl(ni, m, subtype); 917 goto out; 918 919 default: 920 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 921 wh, NULL, "bad frame type 0x%x", type); 922 /* should not come here */ 923 break; 924 } 925err: 926 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 927out: 928 if (m != NULL) { 929 if (need_tap && ieee80211_radiotap_active_vap(vap)) 930 ieee80211_radiotap_rx(vap, m); 931 m_freem(m); 932 } 933 return type; 934} 935 936static void 937sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 938 int rssi, int nf, uint16_t seq, uint16_t status) 939{ 940 struct ieee80211vap *vap = ni->ni_vap; 941 942 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 943 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 944 ni->ni_macaddr, "open auth", 945 "bad sta auth mode %u", ni->ni_authmode); 946 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 947 return; 948 } 949 if (vap->iv_state != IEEE80211_S_AUTH || 950 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 951 vap->iv_stats.is_rx_bad_auth++; 952 return; 953 } 954 if (status != 0) { 955 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 956 ni, "open auth failed (reason %d)", status); 957 vap->iv_stats.is_rx_auth_fail++; 958 vap->iv_stats.is_rx_authfail_code = status; 959 ieee80211_new_state(vap, IEEE80211_S_SCAN, 960 IEEE80211_SCAN_FAIL_STATUS); 961 } else 962 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 963} 964 965static void 966sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 967 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 968 uint16_t seq, uint16_t status) 969{ 970 struct ieee80211vap *vap = ni->ni_vap; 971 uint8_t *challenge; 972 int estatus; 973 974 /* 975 * NB: this can happen as we allow pre-shared key 976 * authentication to be enabled w/o wep being turned 977 * on so that configuration of these can be done 978 * in any order. It may be better to enforce the 979 * ordering in which case this check would just be 980 * for sanity/consistency. 981 */ 982 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 983 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 984 ni->ni_macaddr, "shared key auth", 985 "%s", " PRIVACY is disabled"); 986 estatus = IEEE80211_STATUS_ALG; 987 goto bad; 988 } 989 /* 990 * Pre-shared key authentication is evil; accept 991 * it only if explicitly configured (it is supported 992 * mainly for compatibility with clients like OS X). 993 */ 994 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 995 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 996 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 997 ni->ni_macaddr, "shared key auth", 998 "bad sta auth mode %u", ni->ni_authmode); 999 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1000 estatus = IEEE80211_STATUS_ALG; 1001 goto bad; 1002 } 1003 1004 challenge = NULL; 1005 if (frm + 1 < efrm) { 1006 if ((frm[1] + 2) > (efrm - frm)) { 1007 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1008 ni->ni_macaddr, "shared key auth", 1009 "ie %d/%d too long", 1010 frm[0], (frm[1] + 2) - (efrm - frm)); 1011 vap->iv_stats.is_rx_bad_auth++; 1012 estatus = IEEE80211_STATUS_CHALLENGE; 1013 goto bad; 1014 } 1015 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1016 challenge = frm; 1017 frm += frm[1] + 2; 1018 } 1019 switch (seq) { 1020 case IEEE80211_AUTH_SHARED_CHALLENGE: 1021 case IEEE80211_AUTH_SHARED_RESPONSE: 1022 if (challenge == NULL) { 1023 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1024 ni->ni_macaddr, "shared key auth", 1025 "%s", "no challenge"); 1026 vap->iv_stats.is_rx_bad_auth++; 1027 estatus = IEEE80211_STATUS_CHALLENGE; 1028 goto bad; 1029 } 1030 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1031 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1032 ni->ni_macaddr, "shared key auth", 1033 "bad challenge len %d", challenge[1]); 1034 vap->iv_stats.is_rx_bad_auth++; 1035 estatus = IEEE80211_STATUS_CHALLENGE; 1036 goto bad; 1037 } 1038 default: 1039 break; 1040 } 1041 if (vap->iv_state != IEEE80211_S_AUTH) 1042 return; 1043 switch (seq) { 1044 case IEEE80211_AUTH_SHARED_PASS: 1045 if (ni->ni_challenge != NULL) { 1046 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1047 ni->ni_challenge = NULL; 1048 } 1049 if (status != 0) { 1050 IEEE80211_NOTE_FRAME(vap, 1051 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1052 "shared key auth failed (reason %d)", status); 1053 vap->iv_stats.is_rx_auth_fail++; 1054 vap->iv_stats.is_rx_authfail_code = status; 1055 return; 1056 } 1057 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1058 break; 1059 case IEEE80211_AUTH_SHARED_CHALLENGE: 1060 if (!ieee80211_alloc_challenge(ni)) 1061 return; 1062 /* XXX could optimize by passing recvd challenge */ 1063 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1064 IEEE80211_SEND_MGMT(ni, 1065 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1066 break; 1067 default: 1068 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1069 wh, "shared key auth", "bad seq %d", seq); 1070 vap->iv_stats.is_rx_bad_auth++; 1071 return; 1072 } 1073 return; 1074bad: 1075 /* 1076 * Kick the state machine. This short-circuits 1077 * using the mgt frame timeout to trigger the 1078 * state transition. 1079 */ 1080 if (vap->iv_state == IEEE80211_S_AUTH) 1081 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1082 IEEE80211_SCAN_FAIL_STATUS); 1083} 1084 1085int 1086ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1087 const struct ieee80211_frame *wh) 1088{ 1089#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1090 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1091 u_int len = frm[1], qosinfo; 1092 int i; 1093 1094 if (len < sizeof(struct ieee80211_wme_param)-2) { 1095 IEEE80211_DISCARD_IE(vap, 1096 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1097 wh, "WME", "too short, len %u", len); 1098 return -1; 1099 } 1100 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1101 qosinfo &= WME_QOSINFO_COUNT; 1102 /* XXX do proper check for wraparound */ 1103 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1104 return 0; 1105 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1106 for (i = 0; i < WME_NUM_AC; i++) { 1107 struct wmeParams *wmep = 1108 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1109 /* NB: ACI not used */ 1110 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1111 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1112 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1113 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1114 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1115 frm += 4; 1116 } 1117 wme->wme_wmeChanParams.cap_info = qosinfo; 1118 return 1; 1119#undef MS 1120} 1121 1122/* 1123 * Process 11h Channel Switch Announcement (CSA) ie. If this 1124 * is the first CSA then initiate the switch. Otherwise we 1125 * track state and trigger completion and/or cancel of the switch. 1126 * XXX should be public for IBSS use 1127 */ 1128static void 1129ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1130 const struct ieee80211_frame *wh) 1131{ 1132 struct ieee80211com *ic = vap->iv_ic; 1133 const struct ieee80211_csa_ie *csa = 1134 (const struct ieee80211_csa_ie *) frm; 1135 1136 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1137 ("state %s", ieee80211_state_name[vap->iv_state])); 1138 1139 if (csa->csa_mode > 1) { 1140 IEEE80211_DISCARD_IE(vap, 1141 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1142 wh, "CSA", "invalid mode %u", csa->csa_mode); 1143 return; 1144 } 1145 IEEE80211_LOCK(ic); 1146 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1147 /* 1148 * Convert the channel number to a channel reference. We 1149 * try first to preserve turbo attribute of the current 1150 * channel then fallback. Note this will not work if the 1151 * CSA specifies a channel that requires a band switch (e.g. 1152 * 11a => 11g). This is intentional as 11h is defined only 1153 * for 5GHz/11a and because the switch does not involve a 1154 * reassociation, protocol state (capabilities, negotated 1155 * rates, etc) may/will be wrong. 1156 */ 1157 struct ieee80211_channel *c = 1158 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1159 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1160 if (c == NULL) { 1161 c = ieee80211_find_channel_byieee(ic, 1162 csa->csa_newchan, 1163 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1164 if (c == NULL) { 1165 IEEE80211_DISCARD_IE(vap, 1166 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1167 wh, "CSA", "invalid channel %u", 1168 csa->csa_newchan); 1169 goto done; 1170 } 1171 } 1172#if IEEE80211_CSA_COUNT_MIN > 0 1173 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1174 /* 1175 * Require at least IEEE80211_CSA_COUNT_MIN count to 1176 * reduce the risk of being redirected by a fabricated 1177 * CSA. If a valid CSA is dropped we'll still get a 1178 * beacon miss when the AP leaves the channel so we'll 1179 * eventually follow to the new channel. 1180 * 1181 * NOTE: this violates the 11h spec that states that 1182 * count may be any value and if 0 then a switch 1183 * should happen asap. 1184 */ 1185 IEEE80211_DISCARD_IE(vap, 1186 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1187 wh, "CSA", "count %u too small, must be >= %u", 1188 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1189 goto done; 1190 } 1191#endif 1192 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1193 } else { 1194 /* 1195 * Validate this ie against the initial CSA. We require 1196 * mode and channel not change and the count must be 1197 * monotonically decreasing. This may be pointless and 1198 * canceling the switch as a result may be too paranoid but 1199 * in the worst case if we drop out of CSA because of this 1200 * and the AP does move then we'll just end up taking a 1201 * beacon miss and scan to find the AP. 1202 * 1203 * XXX may want <= on count as we also process ProbeResp 1204 * frames and those may come in w/ the same count as the 1205 * previous beacon; but doing so leaves us open to a stuck 1206 * count until we add a dead-man timer 1207 */ 1208 if (!(csa->csa_count < ic->ic_csa_count && 1209 csa->csa_mode == ic->ic_csa_mode && 1210 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1211 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1212 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1213 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1214 ic->ic_csa_newchan, ic->ic_csa_count, 1215 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1216 ieee80211_csa_cancelswitch(ic); 1217 } else { 1218 if (csa->csa_count <= 1) 1219 ieee80211_csa_completeswitch(ic); 1220 else 1221 ic->ic_csa_count = csa->csa_count; 1222 } 1223 } 1224done: 1225 IEEE80211_UNLOCK(ic); 1226} 1227 1228/* 1229 * Return non-zero if a background scan may be continued: 1230 * o bg scan is active 1231 * o no channel switch is pending 1232 * o there has not been any traffic recently 1233 * 1234 * Note we do not check if there is an administrative enable; 1235 * this is only done to start the scan. We assume that any 1236 * change in state will be accompanied by a request to cancel 1237 * active scans which will otherwise cause this test to fail. 1238 */ 1239static __inline int 1240contbgscan(struct ieee80211vap *vap) 1241{ 1242 struct ieee80211com *ic = vap->iv_ic; 1243 1244 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1245 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1246 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1247 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1248} 1249 1250/* 1251 * Return non-zero if a backgrond scan may be started: 1252 * o bg scanning is administratively enabled 1253 * o no channel switch is pending 1254 * o we are not boosted on a dynamic turbo channel 1255 * o there has not been a scan recently 1256 * o there has not been any traffic recently 1257 */ 1258static __inline int 1259startbgscan(struct ieee80211vap *vap) 1260{ 1261 struct ieee80211com *ic = vap->iv_ic; 1262 1263 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1264 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1265#ifdef IEEE80211_SUPPORT_SUPERG 1266 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1267#endif 1268 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1269 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1270} 1271 1272static void 1273sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1274 const struct ieee80211_rx_stats *rxs, 1275 int rssi, int nf) 1276{ 1277#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1278#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1279 struct ieee80211vap *vap = ni->ni_vap; 1280 struct ieee80211com *ic = ni->ni_ic; 1281 struct ieee80211_channel *rxchan = ic->ic_curchan; 1282 struct ieee80211_frame *wh; 1283 uint8_t *frm, *efrm; 1284 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1285 uint8_t rate; 1286 int ht_state_change = 0; 1287 1288 wh = mtod(m0, struct ieee80211_frame *); 1289 frm = (uint8_t *)&wh[1]; 1290 efrm = mtod(m0, uint8_t *) + m0->m_len; 1291 switch (subtype) { 1292 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1293 case IEEE80211_FC0_SUBTYPE_BEACON: { 1294 struct ieee80211_scanparams scan; 1295 struct ieee80211_channel *c; 1296 /* 1297 * We process beacon/probe response frames: 1298 * o when scanning, or 1299 * o station mode when associated (to collect state 1300 * updates such as 802.11g slot time) 1301 * Frames otherwise received are discarded. 1302 */ 1303 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1304 vap->iv_stats.is_rx_mgtdiscard++; 1305 return; 1306 } 1307 1308 /* Override RX channel as appropriate */ 1309 if (rxs != NULL) { 1310 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1311 if (c != NULL) 1312 rxchan = c; 1313 } 1314 1315 /* XXX probe response in sta mode when !scanning? */ 1316 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1317 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1318 vap->iv_stats.is_beacon_bad++; 1319 return; 1320 } 1321 1322 /* 1323 * Count frame now that we know it's to be processed. 1324 */ 1325 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1326 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1327 IEEE80211_NODE_STAT(ni, rx_beacons); 1328 } else 1329 IEEE80211_NODE_STAT(ni, rx_proberesp); 1330 /* 1331 * When operating in station mode, check for state updates. 1332 * Be careful to ignore beacons received while doing a 1333 * background scan. We consider only 11g/WMM stuff right now. 1334 */ 1335 if (ni->ni_associd != 0 && 1336 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1337 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1338 /* record tsf of last beacon */ 1339 memcpy(ni->ni_tstamp.data, scan.tstamp, 1340 sizeof(ni->ni_tstamp)); 1341 /* count beacon frame for s/w bmiss handling */ 1342 vap->iv_swbmiss_count++; 1343 vap->iv_bmiss_count = 0; 1344 if (ni->ni_erp != scan.erp) { 1345 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1346 wh->i_addr2, 1347 "erp change: was 0x%x, now 0x%x", 1348 ni->ni_erp, scan.erp); 1349 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1350 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1351 ic->ic_flags |= IEEE80211_F_USEPROT; 1352 else 1353 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1354 ni->ni_erp = scan.erp; 1355 /* XXX statistic */ 1356 /* XXX driver notification */ 1357 } 1358 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1359 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1360 wh->i_addr2, 1361 "capabilities change: was 0x%x, now 0x%x", 1362 ni->ni_capinfo, scan.capinfo); 1363 /* 1364 * NB: we assume short preamble doesn't 1365 * change dynamically 1366 */ 1367 ieee80211_set_shortslottime(ic, 1368 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1369 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1370 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1371 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1372 /* XXX statistic */ 1373 } 1374 if (scan.wme != NULL && 1375 (ni->ni_flags & IEEE80211_NODE_QOS) && 1376 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1377 ieee80211_wme_updateparams(vap); 1378#ifdef IEEE80211_SUPPORT_SUPERG 1379 if (scan.ath != NULL) 1380 ieee80211_parse_athparams(ni, scan.ath, wh); 1381#endif 1382 if (scan.htcap != NULL && scan.htinfo != NULL && 1383 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1384 /* XXX state changes? */ 1385 if (ieee80211_ht_updateparams(ni, 1386 scan.htcap, scan.htinfo)) 1387 ht_state_change = 1; 1388 } 1389 if (scan.quiet) 1390 ic->ic_set_quiet(ni, scan.quiet); 1391 1392 if (scan.tim != NULL) { 1393 struct ieee80211_tim_ie *tim = 1394 (struct ieee80211_tim_ie *) scan.tim; 1395 /* 1396 * XXX Check/debug this code; see if it's about 1397 * the right time to force the VAP awake if we 1398 * receive a frame destined for us? 1399 */ 1400 int aid = IEEE80211_AID(ni->ni_associd); 1401 int ix = aid / NBBY; 1402 int min = tim->tim_bitctl &~ 1; 1403 int max = tim->tim_len + min - 4; 1404 int tim_ucast = 0, tim_mcast = 0; 1405 1406 /* 1407 * Only do this for unicast traffic in the TIM 1408 * The multicast traffic notification for 1409 * the scan notification stuff should occur 1410 * differently. 1411 */ 1412 if (min <= ix && ix <= max && 1413 isset(tim->tim_bitmap - min, aid)) { 1414 tim_ucast = 1; 1415 } 1416 1417 /* 1418 * Do a separate notification 1419 * for the multicast bit being set. 1420 */ 1421 if (tim->tim_bitctl & 1) { 1422 tim_mcast = 1; 1423 } 1424 1425 /* 1426 * If the TIM indicates there's traffic for 1427 * us then get us out of STA mode powersave. 1428 */ 1429 if (tim_ucast == 1) { 1430 1431 /* 1432 * Wake us out of SLEEP state if we're 1433 * in it; and if we're doing bgscan 1434 * then wake us out of STA powersave. 1435 */ 1436 ieee80211_sta_tim_notify(vap, 1); 1437 1438 /* 1439 * This is preventing us from 1440 * continuing a bgscan; because it 1441 * tricks the contbgscan() 1442 * routine to think there's always 1443 * traffic for us. 1444 * 1445 * I think we need both an RX and 1446 * TX ic_lastdata field. 1447 */ 1448 ic->ic_lastdata = ticks; 1449 } 1450 1451 ni->ni_dtim_count = tim->tim_count; 1452 ni->ni_dtim_period = tim->tim_period; 1453 } 1454 if (scan.csa != NULL && 1455 (vap->iv_flags & IEEE80211_F_DOTH)) 1456 ieee80211_parse_csaparams(vap, scan.csa, wh); 1457 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1458 /* 1459 * No CSA ie or 11h disabled, but a channel 1460 * switch is pending; drop out so we aren't 1461 * stuck in CSA state. If the AP really is 1462 * moving we'll get a beacon miss and scan. 1463 */ 1464 IEEE80211_LOCK(ic); 1465 ieee80211_csa_cancelswitch(ic); 1466 IEEE80211_UNLOCK(ic); 1467 } 1468 /* 1469 * If scanning, pass the info to the scan module. 1470 * Otherwise, check if it's the right time to do 1471 * a background scan. Background scanning must 1472 * be enabled and we must not be operating in the 1473 * turbo phase of dynamic turbo mode. Then, 1474 * it's been a while since the last background 1475 * scan and if no data frames have come through 1476 * recently, kick off a scan. Note that this 1477 * is the mechanism by which a background scan 1478 * is started _and_ continued each time we 1479 * return on-channel to receive a beacon from 1480 * our ap. 1481 */ 1482 if (ic->ic_flags & IEEE80211_F_SCAN) { 1483 ieee80211_add_scan(vap, rxchan, 1484 &scan, wh, subtype, rssi, nf); 1485 } else if (contbgscan(vap)) { 1486 ieee80211_bg_scan(vap, 0); 1487 } else if (startbgscan(vap)) { 1488 vap->iv_stats.is_scan_bg++; 1489#if 0 1490 /* wakeup if we are sleeing */ 1491 ieee80211_set_pwrsave(vap, 0); 1492#endif 1493 ieee80211_bg_scan(vap, 0); 1494 } 1495 1496 /* 1497 * Put the station to sleep if we haven't seen 1498 * traffic in a while. 1499 */ 1500 IEEE80211_LOCK(ic); 1501 ieee80211_sta_ps_timer_check(vap); 1502 IEEE80211_UNLOCK(ic); 1503 1504 /* 1505 * If we've had a channel width change (eg HT20<->HT40) 1506 * then schedule a delayed driver notification. 1507 */ 1508 if (ht_state_change) 1509 ieee80211_update_chw(ic); 1510 return; 1511 } 1512 /* 1513 * If scanning, just pass information to the scan module. 1514 */ 1515 if (ic->ic_flags & IEEE80211_F_SCAN) { 1516 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1517 /* 1518 * Actively scanning a channel marked passive; 1519 * send a probe request now that we know there 1520 * is 802.11 traffic present. 1521 * 1522 * XXX check if the beacon we recv'd gives 1523 * us what we need and suppress the probe req 1524 */ 1525 ieee80211_probe_curchan(vap, 1); 1526 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1527 } 1528 ieee80211_add_scan(vap, rxchan, &scan, wh, 1529 subtype, rssi, nf); 1530 return; 1531 } 1532 break; 1533 } 1534 1535 case IEEE80211_FC0_SUBTYPE_AUTH: { 1536 uint16_t algo, seq, status; 1537 /* 1538 * auth frame format 1539 * [2] algorithm 1540 * [2] sequence 1541 * [2] status 1542 * [tlv*] challenge 1543 */ 1544 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1545 algo = le16toh(*(uint16_t *)frm); 1546 seq = le16toh(*(uint16_t *)(frm + 2)); 1547 status = le16toh(*(uint16_t *)(frm + 4)); 1548 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1549 "recv auth frame with algorithm %d seq %d", algo, seq); 1550 1551 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1552 IEEE80211_DISCARD(vap, 1553 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1554 wh, "auth", "%s", "TKIP countermeasures enabled"); 1555 vap->iv_stats.is_rx_auth_countermeasures++; 1556 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1557 ieee80211_send_error(ni, wh->i_addr2, 1558 IEEE80211_FC0_SUBTYPE_AUTH, 1559 IEEE80211_REASON_MIC_FAILURE); 1560 } 1561 return; 1562 } 1563 if (algo == IEEE80211_AUTH_ALG_SHARED) 1564 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1565 seq, status); 1566 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1567 sta_auth_open(ni, wh, rssi, nf, seq, status); 1568 else { 1569 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1570 wh, "auth", "unsupported alg %d", algo); 1571 vap->iv_stats.is_rx_auth_unsupported++; 1572 return; 1573 } 1574 break; 1575 } 1576 1577 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1578 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1579 uint16_t capinfo, associd; 1580 uint16_t status; 1581 1582 if (vap->iv_state != IEEE80211_S_ASSOC) { 1583 vap->iv_stats.is_rx_mgtdiscard++; 1584 return; 1585 } 1586 1587 /* 1588 * asresp frame format 1589 * [2] capability information 1590 * [2] status 1591 * [2] association ID 1592 * [tlv] supported rates 1593 * [tlv] extended supported rates 1594 * [tlv] WME 1595 * [tlv] HT capabilities 1596 * [tlv] HT info 1597 */ 1598 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1599 ni = vap->iv_bss; 1600 capinfo = le16toh(*(uint16_t *)frm); 1601 frm += 2; 1602 status = le16toh(*(uint16_t *)frm); 1603 frm += 2; 1604 if (status != 0) { 1605 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1606 wh->i_addr2, "%sassoc failed (reason %d)", 1607 ISREASSOC(subtype) ? "re" : "", status); 1608 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1609 return; 1610 } 1611 associd = le16toh(*(uint16_t *)frm); 1612 frm += 2; 1613 1614 rates = xrates = wme = htcap = htinfo = NULL; 1615 while (efrm - frm > 1) { 1616 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1617 switch (*frm) { 1618 case IEEE80211_ELEMID_RATES: 1619 rates = frm; 1620 break; 1621 case IEEE80211_ELEMID_XRATES: 1622 xrates = frm; 1623 break; 1624 case IEEE80211_ELEMID_HTCAP: 1625 htcap = frm; 1626 break; 1627 case IEEE80211_ELEMID_HTINFO: 1628 htinfo = frm; 1629 break; 1630 case IEEE80211_ELEMID_VENDOR: 1631 if (iswmeoui(frm)) 1632 wme = frm; 1633 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1634 /* 1635 * Accept pre-draft HT ie's if the 1636 * standard ones have not been seen. 1637 */ 1638 if (ishtcapoui(frm)) { 1639 if (htcap == NULL) 1640 htcap = frm; 1641 } else if (ishtinfooui(frm)) { 1642 if (htinfo == NULL) 1643 htinfo = frm; 1644 } 1645 } 1646 /* XXX Atheros OUI support */ 1647 break; 1648 } 1649 frm += frm[1] + 2; 1650 } 1651 1652 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1653 if (xrates != NULL) 1654 IEEE80211_VERIFY_ELEMENT(xrates, 1655 IEEE80211_RATE_MAXSIZE - rates[1], return); 1656 rate = ieee80211_setup_rates(ni, rates, xrates, 1657 IEEE80211_F_JOIN | 1658 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1659 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1660 if (rate & IEEE80211_RATE_BASIC) { 1661 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1662 wh->i_addr2, 1663 "%sassoc failed (rate set mismatch)", 1664 ISREASSOC(subtype) ? "re" : ""); 1665 vap->iv_stats.is_rx_assoc_norate++; 1666 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1667 IEEE80211_SCAN_FAIL_STATUS); 1668 return; 1669 } 1670 1671 ni->ni_capinfo = capinfo; 1672 ni->ni_associd = associd; 1673 if (ni->ni_jointime == 0) 1674 ni->ni_jointime = time_uptime; 1675 if (wme != NULL && 1676 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1677 ni->ni_flags |= IEEE80211_NODE_QOS; 1678 ieee80211_wme_updateparams(vap); 1679 } else 1680 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1681 /* 1682 * Setup HT state according to the negotiation. 1683 * 1684 * NB: shouldn't need to check if HT use is enabled but some 1685 * ap's send back HT ie's even when we don't indicate we 1686 * are HT capable in our AssocReq. 1687 */ 1688 if (htcap != NULL && htinfo != NULL && 1689 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1690 ieee80211_ht_node_init(ni); 1691 ieee80211_ht_updateparams(ni, htcap, htinfo); 1692 ieee80211_setup_htrates(ni, htcap, 1693 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1694 ieee80211_setup_basic_htrates(ni, htinfo); 1695 ieee80211_node_setuptxparms(ni); 1696 ieee80211_ratectl_node_init(ni); 1697 } else { 1698#ifdef IEEE80211_SUPPORT_SUPERG 1699 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1700 ieee80211_ff_node_init(ni); 1701#endif 1702 } 1703 /* 1704 * Configure state now that we are associated. 1705 * 1706 * XXX may need different/additional driver callbacks? 1707 */ 1708 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1709 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1710 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1711 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1712 } else { 1713 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1714 ic->ic_flags |= IEEE80211_F_USEBARKER; 1715 } 1716 ieee80211_set_shortslottime(ic, 1717 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1718 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1719 /* 1720 * Honor ERP protection. 1721 * 1722 * NB: ni_erp should zero for non-11g operation. 1723 */ 1724 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1725 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1726 ic->ic_flags |= IEEE80211_F_USEPROT; 1727 else 1728 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1729 IEEE80211_NOTE_MAC(vap, 1730 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1731 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1732 ISREASSOC(subtype) ? "re" : "", 1733 IEEE80211_NODE_AID(ni), 1734 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1735 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1736 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1737 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1738 ni->ni_flags & IEEE80211_NODE_HT ? 1739 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1740 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1741 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1742 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1743 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1744 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1745 ", fast-frames" : "", 1746 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1747 ", turbo" : "" 1748 ); 1749 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1750 break; 1751 } 1752 1753 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1754 uint16_t reason; 1755 1756 if (vap->iv_state == IEEE80211_S_SCAN) { 1757 vap->iv_stats.is_rx_mgtdiscard++; 1758 return; 1759 } 1760 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1761 /* NB: can happen when in promiscuous mode */ 1762 vap->iv_stats.is_rx_mgtdiscard++; 1763 break; 1764 } 1765 1766 /* 1767 * deauth frame format 1768 * [2] reason 1769 */ 1770 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1771 reason = le16toh(*(uint16_t *)frm); 1772 1773 vap->iv_stats.is_rx_deauth++; 1774 vap->iv_stats.is_rx_deauth_code = reason; 1775 IEEE80211_NODE_STAT(ni, rx_deauth); 1776 1777 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1778 "recv deauthenticate (reason %d)", reason); 1779 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1780 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1781 break; 1782 } 1783 1784 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1785 uint16_t reason; 1786 1787 if (vap->iv_state != IEEE80211_S_RUN && 1788 vap->iv_state != IEEE80211_S_ASSOC && 1789 vap->iv_state != IEEE80211_S_AUTH) { 1790 vap->iv_stats.is_rx_mgtdiscard++; 1791 return; 1792 } 1793 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1794 /* NB: can happen when in promiscuous mode */ 1795 vap->iv_stats.is_rx_mgtdiscard++; 1796 break; 1797 } 1798 1799 /* 1800 * disassoc frame format 1801 * [2] reason 1802 */ 1803 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1804 reason = le16toh(*(uint16_t *)frm); 1805 1806 vap->iv_stats.is_rx_disassoc++; 1807 vap->iv_stats.is_rx_disassoc_code = reason; 1808 IEEE80211_NODE_STAT(ni, rx_disassoc); 1809 1810 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1811 "recv disassociate (reason %d)", reason); 1812 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1813 break; 1814 } 1815 1816 case IEEE80211_FC0_SUBTYPE_ACTION: 1817 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1818 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1819 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1820 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1821 wh, NULL, "%s", "not for us"); 1822 vap->iv_stats.is_rx_mgtdiscard++; 1823 } else if (vap->iv_state != IEEE80211_S_RUN) { 1824 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1825 wh, NULL, "wrong state %s", 1826 ieee80211_state_name[vap->iv_state]); 1827 vap->iv_stats.is_rx_mgtdiscard++; 1828 } else { 1829 if (ieee80211_parse_action(ni, m0) == 0) 1830 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1831 } 1832 break; 1833 1834 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1835 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1836 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1837 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1838 case IEEE80211_FC0_SUBTYPE_ATIM: 1839 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1840 wh, NULL, "%s", "not handled"); 1841 vap->iv_stats.is_rx_mgtdiscard++; 1842 break; 1843 1844 default: 1845 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1846 wh, "mgt", "subtype 0x%x not handled", subtype); 1847 vap->iv_stats.is_rx_badsubtype++; 1848 break; 1849 } 1850#undef ISREASSOC 1851#undef ISPROBE 1852} 1853 1854static void 1855sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1856{ 1857 switch (subtype) { 1858 case IEEE80211_FC0_SUBTYPE_BAR: 1859 ieee80211_recv_bar(ni, m); 1860 break; 1861 } 1862} 1863