ieee80211_sta.c revision 297164
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 297164 2016-03-21 20:52:09Z 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 209static void 210sta_swbmiss_start(struct ieee80211vap *vap) 211{ 212 213 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) { 214 /* 215 * Start s/w beacon miss timer for devices w/o 216 * hardware support. We fudge a bit here since 217 * we're doing this in software. 218 */ 219 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 220 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval); 221 vap->iv_swbmiss_count = 0; 222 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 223 ieee80211_swbmiss, vap); 224 } 225} 226 227/* 228 * IEEE80211_M_STA vap state machine handler. 229 * This routine handles the main states in the 802.11 protocol. 230 */ 231static int 232sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 233{ 234 struct ieee80211com *ic = vap->iv_ic; 235 struct ieee80211_node *ni; 236 enum ieee80211_state ostate; 237 238 IEEE80211_LOCK_ASSERT(ic); 239 240 ostate = vap->iv_state; 241 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 242 __func__, ieee80211_state_name[ostate], 243 ieee80211_state_name[nstate], arg); 244 vap->iv_state = nstate; /* state transition */ 245 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 246 if (ostate != IEEE80211_S_SCAN) 247 ieee80211_cancel_scan(vap); /* background scan */ 248 ni = vap->iv_bss; /* NB: no reference held */ 249 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 250 callout_stop(&vap->iv_swbmiss); 251 switch (nstate) { 252 case IEEE80211_S_INIT: 253 switch (ostate) { 254 case IEEE80211_S_SLEEP: 255 /* XXX wakeup */ 256 /* XXX driver hook to wakeup the hardware? */ 257 case IEEE80211_S_RUN: 258 IEEE80211_SEND_MGMT(ni, 259 IEEE80211_FC0_SUBTYPE_DISASSOC, 260 IEEE80211_REASON_ASSOC_LEAVE); 261 ieee80211_sta_leave(ni); 262 break; 263 case IEEE80211_S_ASSOC: 264 IEEE80211_SEND_MGMT(ni, 265 IEEE80211_FC0_SUBTYPE_DEAUTH, 266 IEEE80211_REASON_AUTH_LEAVE); 267 break; 268 case IEEE80211_S_SCAN: 269 ieee80211_cancel_scan(vap); 270 break; 271 default: 272 break; 273 } 274 if (ostate != IEEE80211_S_INIT) { 275 /* NB: optimize INIT -> INIT case */ 276 ieee80211_reset_bss(vap); 277 } 278 if (vap->iv_auth->ia_detach != NULL) 279 vap->iv_auth->ia_detach(vap); 280 break; 281 case IEEE80211_S_SCAN: 282 switch (ostate) { 283 case IEEE80211_S_INIT: 284 /* 285 * Initiate a scan. We can come here as a result 286 * of an IEEE80211_IOC_SCAN_REQ too in which case 287 * the vap will be marked with IEEE80211_FEXT_SCANREQ 288 * and the scan request parameters will be present 289 * in iv_scanreq. Otherwise we do the default. 290 */ 291 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 292 ieee80211_check_scan(vap, 293 vap->iv_scanreq_flags, 294 vap->iv_scanreq_duration, 295 vap->iv_scanreq_mindwell, 296 vap->iv_scanreq_maxdwell, 297 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 298 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 299 } else 300 ieee80211_check_scan_current(vap); 301 break; 302 case IEEE80211_S_SCAN: 303 case IEEE80211_S_AUTH: 304 case IEEE80211_S_ASSOC: 305 /* 306 * These can happen either because of a timeout 307 * on an assoc/auth response or because of a 308 * change in state that requires a reset. For 309 * the former we're called with a non-zero arg 310 * that is the cause for the failure; pass this 311 * to the scan code so it can update state. 312 * Otherwise trigger a new scan unless we're in 313 * manual roaming mode in which case an application 314 * must issue an explicit scan request. 315 */ 316 if (arg != 0) 317 ieee80211_scan_assoc_fail(vap, 318 vap->iv_bss->ni_macaddr, arg); 319 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 320 ieee80211_check_scan_current(vap); 321 break; 322 case IEEE80211_S_SLEEP: /* beacon miss */ 323 /* 324 * XXX if in sleep we need to wakeup the hardware. 325 */ 326 /* FALLTHROUGH */ 327 case IEEE80211_S_RUN: /* beacon miss */ 328 /* 329 * Beacon miss. Notify user space and if not 330 * under control of a user application (roaming 331 * manual) kick off a scan to re-connect. 332 */ 333 334 ieee80211_sta_leave(ni); 335 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 336 ieee80211_check_scan_current(vap); 337 break; 338 default: 339 goto invalid; 340 } 341 break; 342 case IEEE80211_S_AUTH: 343 switch (ostate) { 344 case IEEE80211_S_INIT: 345 case IEEE80211_S_SCAN: 346 IEEE80211_SEND_MGMT(ni, 347 IEEE80211_FC0_SUBTYPE_AUTH, 1); 348 break; 349 case IEEE80211_S_AUTH: 350 case IEEE80211_S_ASSOC: 351 switch (arg & 0xff) { 352 case IEEE80211_FC0_SUBTYPE_AUTH: 353 /* ??? */ 354 IEEE80211_SEND_MGMT(ni, 355 IEEE80211_FC0_SUBTYPE_AUTH, 2); 356 break; 357 case IEEE80211_FC0_SUBTYPE_DEAUTH: 358 sta_authretry(vap, ni, arg>>8); 359 break; 360 } 361 break; 362 case IEEE80211_S_SLEEP: 363 case IEEE80211_S_RUN: 364 switch (arg & 0xff) { 365 case IEEE80211_FC0_SUBTYPE_AUTH: 366 IEEE80211_SEND_MGMT(ni, 367 IEEE80211_FC0_SUBTYPE_AUTH, 2); 368 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 369 break; 370 case IEEE80211_FC0_SUBTYPE_DEAUTH: 371 ieee80211_sta_leave(ni); 372 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 373 /* try to reauth */ 374 IEEE80211_SEND_MGMT(ni, 375 IEEE80211_FC0_SUBTYPE_AUTH, 1); 376 } 377 break; 378 } 379 break; 380 default: 381 goto invalid; 382 } 383 break; 384 case IEEE80211_S_ASSOC: 385 switch (ostate) { 386 case IEEE80211_S_AUTH: 387 case IEEE80211_S_ASSOC: 388 IEEE80211_SEND_MGMT(ni, 389 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 390 break; 391 case IEEE80211_S_SLEEP: /* cannot happen */ 392 case IEEE80211_S_RUN: 393 ieee80211_sta_leave(ni); 394 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 395 IEEE80211_SEND_MGMT(ni, arg ? 396 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 397 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 398 } 399 break; 400 default: 401 goto invalid; 402 } 403 break; 404 case IEEE80211_S_RUN: 405 if (vap->iv_flags & IEEE80211_F_WPA) { 406 /* XXX validate prerequisites */ 407 } 408 switch (ostate) { 409 case IEEE80211_S_RUN: 410 case IEEE80211_S_CSA: 411 break; 412 case IEEE80211_S_AUTH: /* when join is done in fw */ 413 case IEEE80211_S_ASSOC: 414#ifdef IEEE80211_DEBUG 415 if (ieee80211_msg_debug(vap)) { 416 ieee80211_note(vap, "%s with %s ssid ", 417 (vap->iv_opmode == IEEE80211_M_STA ? 418 "associated" : "synchronized"), 419 ether_sprintf(ni->ni_bssid)); 420 ieee80211_print_essid(vap->iv_bss->ni_essid, 421 ni->ni_esslen); 422 /* XXX MCS/HT */ 423 printf(" channel %d start %uMb\n", 424 ieee80211_chan2ieee(ic, ic->ic_curchan), 425 IEEE80211_RATE2MBS(ni->ni_txrate)); 426 } 427#endif 428 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 429 ieee80211_notify_node_join(ni, 430 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 431 break; 432 case IEEE80211_S_SLEEP: 433 /* Wake up from sleep */ 434 vap->iv_sta_ps(vap, 0); 435 break; 436 default: 437 goto invalid; 438 } 439 ieee80211_sync_curchan(ic); 440 if (ostate != IEEE80211_S_RUN) 441 sta_swbmiss_start(vap); 442 /* 443 * When 802.1x is not in use mark the port authorized 444 * at this point so traffic can flow. 445 */ 446 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 447 ieee80211_node_authorize(ni); 448 /* 449 * Fake association when joining an existing bss. 450 * 451 * Don't do this if we're doing SLEEP->RUN. 452 */ 453 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 454 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 455 break; 456 case IEEE80211_S_CSA: 457 if (ostate != IEEE80211_S_RUN) 458 goto invalid; 459 break; 460 case IEEE80211_S_SLEEP: 461 sta_swbmiss_start(vap); 462 vap->iv_sta_ps(vap, 1); 463 break; 464 default: 465 invalid: 466 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 467 "%s: unexpected state transition %s -> %s\n", __func__, 468 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 469 break; 470 } 471 return 0; 472} 473 474/* 475 * Return non-zero if the frame is an echo of a multicast 476 * frame sent by ourself. The dir is known to be DSTODS. 477 */ 478static __inline int 479isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 480{ 481#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 482#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 483 const uint8_t *sa; 484 485 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 486 487 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 488 return 0; 489 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 490 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 491#undef WH4 492#undef QWH4 493} 494 495/* 496 * Return non-zero if the frame is an echo of a multicast 497 * frame sent by ourself. The dir is known to be FROMDS. 498 */ 499static __inline int 500isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 501{ 502 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 503 504 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 505 return 0; 506 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 507} 508 509/* 510 * Decide if a received management frame should be 511 * printed when debugging is enabled. This filters some 512 * of the less interesting frames that come frequently 513 * (e.g. beacons). 514 */ 515static __inline int 516doprint(struct ieee80211vap *vap, int subtype) 517{ 518 switch (subtype) { 519 case IEEE80211_FC0_SUBTYPE_BEACON: 520 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 521 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 522 return 0; 523 } 524 return 1; 525} 526 527/* 528 * Process a received frame. The node associated with the sender 529 * should be supplied. If nothing was found in the node table then 530 * the caller is assumed to supply a reference to iv_bss instead. 531 * The RSSI and a timestamp are also supplied. The RSSI data is used 532 * during AP scanning to select a AP to associate with; it can have 533 * any units so long as values have consistent units and higher values 534 * mean ``better signal''. The receive timestamp is currently not used 535 * by the 802.11 layer. 536 */ 537static int 538sta_input(struct ieee80211_node *ni, struct mbuf *m, 539 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 540{ 541 struct ieee80211vap *vap = ni->ni_vap; 542 struct ieee80211com *ic = ni->ni_ic; 543 struct ifnet *ifp = vap->iv_ifp; 544 struct ieee80211_frame *wh; 545 struct ieee80211_key *key; 546 struct ether_header *eh; 547 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 548 uint8_t dir, type, subtype, qos; 549 uint8_t *bssid; 550 551 if (m->m_flags & M_AMPDU_MPDU) { 552 /* 553 * Fastpath for A-MPDU reorder q resubmission. Frames 554 * w/ M_AMPDU_MPDU marked have already passed through 555 * here but were received out of order and been held on 556 * the reorder queue. When resubmitted they are marked 557 * with the M_AMPDU_MPDU flag and we can bypass most of 558 * the normal processing. 559 */ 560 wh = mtod(m, struct ieee80211_frame *); 561 type = IEEE80211_FC0_TYPE_DATA; 562 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 563 subtype = IEEE80211_FC0_SUBTYPE_QOS; 564 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 565 goto resubmit_ampdu; 566 } 567 568 KASSERT(ni != NULL, ("null node")); 569 ni->ni_inact = ni->ni_inact_reload; 570 571 type = -1; /* undefined */ 572 573 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 574 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 575 ni->ni_macaddr, NULL, 576 "too short (1): len %u", m->m_pkthdr.len); 577 vap->iv_stats.is_rx_tooshort++; 578 goto out; 579 } 580 /* 581 * Bit of a cheat here, we use a pointer for a 3-address 582 * frame format but don't reference fields past outside 583 * ieee80211_frame_min w/o first validating the data is 584 * present. 585 */ 586 wh = mtod(m, struct ieee80211_frame *); 587 588 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 589 IEEE80211_FC0_VERSION_0) { 590 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 591 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 592 wh->i_fc[0], wh->i_fc[1]); 593 vap->iv_stats.is_rx_badversion++; 594 goto err; 595 } 596 597 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 598 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 599 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 600 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 601 bssid = wh->i_addr2; 602 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 603 /* not interested in */ 604 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 605 bssid, NULL, "%s", "not to bss"); 606 vap->iv_stats.is_rx_wrongbss++; 607 goto out; 608 } 609 610 /* 611 * Some devices may be in a promiscuous mode 612 * where they receive frames for multiple station 613 * addresses. 614 * 615 * If we receive a data frame that isn't 616 * destined to our VAP MAC, drop it. 617 * 618 * XXX TODO: This is only enforced when not scanning; 619 * XXX it assumes a software-driven scan will put the NIC 620 * XXX into a "no data frames" mode before setting this 621 * XXX flag. Otherwise it may be possible that we'll still 622 * XXX process data frames whilst scanning. 623 */ 624 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 625 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 626 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 627 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 628 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 629 vap->iv_stats.is_rx_wrongbss++; 630 goto out; 631 } 632 633 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 634 ni->ni_noise = nf; 635 if ( IEEE80211_HAS_SEQ(type, subtype) && 636 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 637 uint8_t tid = ieee80211_gettid(wh); 638 if (IEEE80211_QOS_HAS_SEQ(wh) && 639 TID_TO_WME_AC(tid) >= WME_AC_VI) 640 ic->ic_wme.wme_hipri_traffic++; 641 if (! ieee80211_check_rxseq(ni, wh, bssid)) 642 goto out; 643 } 644 } 645 646 switch (type) { 647 case IEEE80211_FC0_TYPE_DATA: 648 hdrspace = ieee80211_hdrspace(ic, wh); 649 if (m->m_len < hdrspace && 650 (m = m_pullup(m, hdrspace)) == NULL) { 651 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 652 ni->ni_macaddr, NULL, 653 "data too short: expecting %u", hdrspace); 654 vap->iv_stats.is_rx_tooshort++; 655 goto out; /* XXX */ 656 } 657 /* 658 * Handle A-MPDU re-ordering. If the frame is to be 659 * processed directly then ieee80211_ampdu_reorder 660 * will return 0; otherwise it has consumed the mbuf 661 * and we should do nothing more with it. 662 */ 663 if ((m->m_flags & M_AMPDU) && 664 (dir == IEEE80211_FC1_DIR_FROMDS || 665 dir == IEEE80211_FC1_DIR_DSTODS) && 666 ieee80211_ampdu_reorder(ni, m) != 0) { 667 m = NULL; 668 goto out; 669 } 670 resubmit_ampdu: 671 if (dir == IEEE80211_FC1_DIR_FROMDS) { 672 if ((ifp->if_flags & IFF_SIMPLEX) && 673 isfromds_mcastecho(vap, wh)) { 674 /* 675 * In IEEE802.11 network, multicast 676 * packets sent from "me" are broadcast 677 * from the AP; silently discard for 678 * SIMPLEX interface. 679 */ 680 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 681 wh, "data", "%s", "multicast echo"); 682 vap->iv_stats.is_rx_mcastecho++; 683 goto out; 684 } 685 if ((vap->iv_flags & IEEE80211_F_DWDS) && 686 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 687 /* 688 * DWDS sta's must drop 3-address mcast frames 689 * as they will be sent separately as a 4-addr 690 * frame. Accepting the 3-addr frame will 691 * confuse the bridge into thinking the sending 692 * sta is located at the end of WDS link. 693 */ 694 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 695 "3-address data", "%s", "DWDS enabled"); 696 vap->iv_stats.is_rx_mcastecho++; 697 goto out; 698 } 699 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 700 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 701 IEEE80211_DISCARD(vap, 702 IEEE80211_MSG_INPUT, wh, "4-address data", 703 "%s", "DWDS not enabled"); 704 vap->iv_stats.is_rx_wrongdir++; 705 goto out; 706 } 707 if ((ifp->if_flags & IFF_SIMPLEX) && 708 isdstods_mcastecho(vap, wh)) { 709 /* 710 * In IEEE802.11 network, multicast 711 * packets sent from "me" are broadcast 712 * from the AP; silently discard for 713 * SIMPLEX interface. 714 */ 715 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 716 "4-address data", "%s", "multicast echo"); 717 vap->iv_stats.is_rx_mcastecho++; 718 goto out; 719 } 720 } else { 721 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 722 "data", "incorrect dir 0x%x", dir); 723 vap->iv_stats.is_rx_wrongdir++; 724 goto out; 725 } 726 727 /* 728 * Handle privacy requirements. Note that we 729 * must not be preempted from here until after 730 * we (potentially) call ieee80211_crypto_demic; 731 * otherwise we may violate assumptions in the 732 * crypto cipher modules used to do delayed update 733 * of replay sequence numbers. 734 */ 735 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 736 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 737 /* 738 * Discard encrypted frames when privacy is off. 739 */ 740 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 741 wh, "WEP", "%s", "PRIVACY off"); 742 vap->iv_stats.is_rx_noprivacy++; 743 IEEE80211_NODE_STAT(ni, rx_noprivacy); 744 goto out; 745 } 746 key = ieee80211_crypto_decap(ni, m, hdrspace); 747 if (key == NULL) { 748 /* NB: stats+msgs handled in crypto_decap */ 749 IEEE80211_NODE_STAT(ni, rx_wepfail); 750 goto out; 751 } 752 wh = mtod(m, struct ieee80211_frame *); 753 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 754 } else { 755 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 756 key = NULL; 757 } 758 759 /* 760 * Save QoS bits for use below--before we strip the header. 761 */ 762 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 763 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 764 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 765 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 766 } else 767 qos = 0; 768 769 /* 770 * Next up, any fragmentation. 771 */ 772 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 773 m = ieee80211_defrag(ni, m, hdrspace); 774 if (m == NULL) { 775 /* Fragment dropped or frame not complete yet */ 776 goto out; 777 } 778 } 779 wh = NULL; /* no longer valid, catch any uses */ 780 781 /* 782 * Next strip any MSDU crypto bits. 783 */ 784 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 785 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 786 ni->ni_macaddr, "data", "%s", "demic error"); 787 vap->iv_stats.is_rx_demicfail++; 788 IEEE80211_NODE_STAT(ni, rx_demicfail); 789 goto out; 790 } 791 792 /* copy to listener after decrypt */ 793 if (ieee80211_radiotap_active_vap(vap)) 794 ieee80211_radiotap_rx(vap, m); 795 need_tap = 0; 796 797 /* 798 * Finally, strip the 802.11 header. 799 */ 800 m = ieee80211_decap(vap, m, hdrspace); 801 if (m == NULL) { 802 /* XXX mask bit to check for both */ 803 /* don't count Null data frames as errors */ 804 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 805 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 806 goto out; 807 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 808 ni->ni_macaddr, "data", "%s", "decap error"); 809 vap->iv_stats.is_rx_decap++; 810 IEEE80211_NODE_STAT(ni, rx_decap); 811 goto err; 812 } 813 eh = mtod(m, struct ether_header *); 814 if (!ieee80211_node_is_authorized(ni)) { 815 /* 816 * Deny any non-PAE frames received prior to 817 * authorization. For open/shared-key 818 * authentication the port is mark authorized 819 * after authentication completes. For 802.1x 820 * the port is not marked authorized by the 821 * authenticator until the handshake has completed. 822 */ 823 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 824 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 825 eh->ether_shost, "data", 826 "unauthorized port: ether type 0x%x len %u", 827 eh->ether_type, m->m_pkthdr.len); 828 vap->iv_stats.is_rx_unauth++; 829 IEEE80211_NODE_STAT(ni, rx_unauth); 830 goto err; 831 } 832 } else { 833 /* 834 * When denying unencrypted frames, discard 835 * any non-PAE frames received without encryption. 836 */ 837 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 838 (key == NULL && (m->m_flags & M_WEP) == 0) && 839 eh->ether_type != htons(ETHERTYPE_PAE)) { 840 /* 841 * Drop unencrypted frames. 842 */ 843 vap->iv_stats.is_rx_unencrypted++; 844 IEEE80211_NODE_STAT(ni, rx_unencrypted); 845 goto out; 846 } 847 } 848 /* XXX require HT? */ 849 if (qos & IEEE80211_QOS_AMSDU) { 850 m = ieee80211_decap_amsdu(ni, m); 851 if (m == NULL) 852 return IEEE80211_FC0_TYPE_DATA; 853 } else { 854#ifdef IEEE80211_SUPPORT_SUPERG 855 m = ieee80211_decap_fastframe(vap, ni, m); 856 if (m == NULL) 857 return IEEE80211_FC0_TYPE_DATA; 858#endif 859 } 860 ieee80211_deliver_data(vap, ni, m); 861 return IEEE80211_FC0_TYPE_DATA; 862 863 case IEEE80211_FC0_TYPE_MGT: 864 vap->iv_stats.is_rx_mgmt++; 865 IEEE80211_NODE_STAT(ni, rx_mgmt); 866 if (dir != IEEE80211_FC1_DIR_NODS) { 867 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 868 wh, "data", "incorrect dir 0x%x", dir); 869 vap->iv_stats.is_rx_wrongdir++; 870 goto err; 871 } 872 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 873 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 874 ni->ni_macaddr, "mgt", "too short: len %u", 875 m->m_pkthdr.len); 876 vap->iv_stats.is_rx_tooshort++; 877 goto out; 878 } 879#ifdef IEEE80211_DEBUG 880 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 881 ieee80211_msg_dumppkts(vap)) { 882 if_printf(ifp, "received %s from %s rssi %d\n", 883 ieee80211_mgt_subtype_name[subtype >> 884 IEEE80211_FC0_SUBTYPE_SHIFT], 885 ether_sprintf(wh->i_addr2), rssi); 886 } 887#endif 888 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 889 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 890 /* 891 * Only shared key auth frames with a challenge 892 * should be encrypted, discard all others. 893 */ 894 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 895 wh, ieee80211_mgt_subtype_name[subtype >> 896 IEEE80211_FC0_SUBTYPE_SHIFT], 897 "%s", "WEP set but not permitted"); 898 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 899 goto out; 900 } 901 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 902 /* 903 * Discard encrypted frames when privacy is off. 904 */ 905 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 906 wh, "mgt", "%s", "WEP set but PRIVACY off"); 907 vap->iv_stats.is_rx_noprivacy++; 908 goto out; 909 } 910 hdrspace = ieee80211_hdrspace(ic, wh); 911 key = ieee80211_crypto_decap(ni, m, hdrspace); 912 if (key == NULL) { 913 /* NB: stats+msgs handled in crypto_decap */ 914 goto out; 915 } 916 wh = mtod(m, struct ieee80211_frame *); 917 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 918 } 919 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 920 goto out; 921 922 case IEEE80211_FC0_TYPE_CTL: 923 vap->iv_stats.is_rx_ctl++; 924 IEEE80211_NODE_STAT(ni, rx_ctrl); 925 vap->iv_recv_ctl(ni, m, subtype); 926 goto out; 927 928 default: 929 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 930 wh, NULL, "bad frame type 0x%x", type); 931 /* should not come here */ 932 break; 933 } 934err: 935 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 936out: 937 if (m != NULL) { 938 if (need_tap && ieee80211_radiotap_active_vap(vap)) 939 ieee80211_radiotap_rx(vap, m); 940 m_freem(m); 941 } 942 return type; 943} 944 945static void 946sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 947 int rssi, int nf, uint16_t seq, uint16_t status) 948{ 949 struct ieee80211vap *vap = ni->ni_vap; 950 951 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 952 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 953 ni->ni_macaddr, "open auth", 954 "bad sta auth mode %u", ni->ni_authmode); 955 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 956 return; 957 } 958 if (vap->iv_state != IEEE80211_S_AUTH || 959 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 960 vap->iv_stats.is_rx_bad_auth++; 961 return; 962 } 963 if (status != 0) { 964 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 965 ni, "open auth failed (reason %d)", status); 966 vap->iv_stats.is_rx_auth_fail++; 967 vap->iv_stats.is_rx_authfail_code = status; 968 ieee80211_new_state(vap, IEEE80211_S_SCAN, 969 IEEE80211_SCAN_FAIL_STATUS); 970 } else 971 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 972} 973 974static void 975sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 976 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 977 uint16_t seq, uint16_t status) 978{ 979 struct ieee80211vap *vap = ni->ni_vap; 980 uint8_t *challenge; 981 int estatus; 982 983 /* 984 * NB: this can happen as we allow pre-shared key 985 * authentication to be enabled w/o wep being turned 986 * on so that configuration of these can be done 987 * in any order. It may be better to enforce the 988 * ordering in which case this check would just be 989 * for sanity/consistency. 990 */ 991 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 992 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 993 ni->ni_macaddr, "shared key auth", 994 "%s", " PRIVACY is disabled"); 995 estatus = IEEE80211_STATUS_ALG; 996 goto bad; 997 } 998 /* 999 * Pre-shared key authentication is evil; accept 1000 * it only if explicitly configured (it is supported 1001 * mainly for compatibility with clients like OS X). 1002 */ 1003 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1004 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1005 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1006 ni->ni_macaddr, "shared key auth", 1007 "bad sta auth mode %u", ni->ni_authmode); 1008 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1009 estatus = IEEE80211_STATUS_ALG; 1010 goto bad; 1011 } 1012 1013 challenge = NULL; 1014 if (frm + 1 < efrm) { 1015 if ((frm[1] + 2) > (efrm - frm)) { 1016 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1017 ni->ni_macaddr, "shared key auth", 1018 "ie %d/%d too long", 1019 frm[0], (frm[1] + 2) - (efrm - frm)); 1020 vap->iv_stats.is_rx_bad_auth++; 1021 estatus = IEEE80211_STATUS_CHALLENGE; 1022 goto bad; 1023 } 1024 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1025 challenge = frm; 1026 frm += frm[1] + 2; 1027 } 1028 switch (seq) { 1029 case IEEE80211_AUTH_SHARED_CHALLENGE: 1030 case IEEE80211_AUTH_SHARED_RESPONSE: 1031 if (challenge == NULL) { 1032 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1033 ni->ni_macaddr, "shared key auth", 1034 "%s", "no challenge"); 1035 vap->iv_stats.is_rx_bad_auth++; 1036 estatus = IEEE80211_STATUS_CHALLENGE; 1037 goto bad; 1038 } 1039 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1040 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1041 ni->ni_macaddr, "shared key auth", 1042 "bad challenge len %d", challenge[1]); 1043 vap->iv_stats.is_rx_bad_auth++; 1044 estatus = IEEE80211_STATUS_CHALLENGE; 1045 goto bad; 1046 } 1047 default: 1048 break; 1049 } 1050 if (vap->iv_state != IEEE80211_S_AUTH) 1051 return; 1052 switch (seq) { 1053 case IEEE80211_AUTH_SHARED_PASS: 1054 if (ni->ni_challenge != NULL) { 1055 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1056 ni->ni_challenge = NULL; 1057 } 1058 if (status != 0) { 1059 IEEE80211_NOTE_FRAME(vap, 1060 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1061 "shared key auth failed (reason %d)", status); 1062 vap->iv_stats.is_rx_auth_fail++; 1063 vap->iv_stats.is_rx_authfail_code = status; 1064 return; 1065 } 1066 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1067 break; 1068 case IEEE80211_AUTH_SHARED_CHALLENGE: 1069 if (!ieee80211_alloc_challenge(ni)) 1070 return; 1071 /* XXX could optimize by passing recvd challenge */ 1072 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1073 IEEE80211_SEND_MGMT(ni, 1074 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1075 break; 1076 default: 1077 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1078 wh, "shared key auth", "bad seq %d", seq); 1079 vap->iv_stats.is_rx_bad_auth++; 1080 return; 1081 } 1082 return; 1083bad: 1084 /* 1085 * Kick the state machine. This short-circuits 1086 * using the mgt frame timeout to trigger the 1087 * state transition. 1088 */ 1089 if (vap->iv_state == IEEE80211_S_AUTH) 1090 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1091 IEEE80211_SCAN_FAIL_STATUS); 1092} 1093 1094int 1095ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1096 const struct ieee80211_frame *wh) 1097{ 1098#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1099 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1100 u_int len = frm[1], qosinfo; 1101 int i; 1102 1103 if (len < sizeof(struct ieee80211_wme_param)-2) { 1104 IEEE80211_DISCARD_IE(vap, 1105 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1106 wh, "WME", "too short, len %u", len); 1107 return -1; 1108 } 1109 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1110 qosinfo &= WME_QOSINFO_COUNT; 1111 /* XXX do proper check for wraparound */ 1112 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1113 return 0; 1114 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1115 for (i = 0; i < WME_NUM_AC; i++) { 1116 struct wmeParams *wmep = 1117 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1118 /* NB: ACI not used */ 1119 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1120 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1121 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1122 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1123 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1124 frm += 4; 1125 } 1126 wme->wme_wmeChanParams.cap_info = qosinfo; 1127 return 1; 1128#undef MS 1129} 1130 1131/* 1132 * Process 11h Channel Switch Announcement (CSA) ie. If this 1133 * is the first CSA then initiate the switch. Otherwise we 1134 * track state and trigger completion and/or cancel of the switch. 1135 * XXX should be public for IBSS use 1136 */ 1137static void 1138ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1139 const struct ieee80211_frame *wh) 1140{ 1141 struct ieee80211com *ic = vap->iv_ic; 1142 const struct ieee80211_csa_ie *csa = 1143 (const struct ieee80211_csa_ie *) frm; 1144 1145 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1146 ("state %s", ieee80211_state_name[vap->iv_state])); 1147 1148 if (csa->csa_mode > 1) { 1149 IEEE80211_DISCARD_IE(vap, 1150 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1151 wh, "CSA", "invalid mode %u", csa->csa_mode); 1152 return; 1153 } 1154 IEEE80211_LOCK(ic); 1155 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1156 /* 1157 * Convert the channel number to a channel reference. We 1158 * try first to preserve turbo attribute of the current 1159 * channel then fallback. Note this will not work if the 1160 * CSA specifies a channel that requires a band switch (e.g. 1161 * 11a => 11g). This is intentional as 11h is defined only 1162 * for 5GHz/11a and because the switch does not involve a 1163 * reassociation, protocol state (capabilities, negotated 1164 * rates, etc) may/will be wrong. 1165 */ 1166 struct ieee80211_channel *c = 1167 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1168 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1169 if (c == NULL) { 1170 c = ieee80211_find_channel_byieee(ic, 1171 csa->csa_newchan, 1172 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1173 if (c == NULL) { 1174 IEEE80211_DISCARD_IE(vap, 1175 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1176 wh, "CSA", "invalid channel %u", 1177 csa->csa_newchan); 1178 goto done; 1179 } 1180 } 1181#if IEEE80211_CSA_COUNT_MIN > 0 1182 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1183 /* 1184 * Require at least IEEE80211_CSA_COUNT_MIN count to 1185 * reduce the risk of being redirected by a fabricated 1186 * CSA. If a valid CSA is dropped we'll still get a 1187 * beacon miss when the AP leaves the channel so we'll 1188 * eventually follow to the new channel. 1189 * 1190 * NOTE: this violates the 11h spec that states that 1191 * count may be any value and if 0 then a switch 1192 * should happen asap. 1193 */ 1194 IEEE80211_DISCARD_IE(vap, 1195 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1196 wh, "CSA", "count %u too small, must be >= %u", 1197 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1198 goto done; 1199 } 1200#endif 1201 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1202 } else { 1203 /* 1204 * Validate this ie against the initial CSA. We require 1205 * mode and channel not change and the count must be 1206 * monotonically decreasing. This may be pointless and 1207 * canceling the switch as a result may be too paranoid but 1208 * in the worst case if we drop out of CSA because of this 1209 * and the AP does move then we'll just end up taking a 1210 * beacon miss and scan to find the AP. 1211 * 1212 * XXX may want <= on count as we also process ProbeResp 1213 * frames and those may come in w/ the same count as the 1214 * previous beacon; but doing so leaves us open to a stuck 1215 * count until we add a dead-man timer 1216 */ 1217 if (!(csa->csa_count < ic->ic_csa_count && 1218 csa->csa_mode == ic->ic_csa_mode && 1219 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1220 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1221 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1222 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1223 ic->ic_csa_newchan, ic->ic_csa_count, 1224 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1225 ieee80211_csa_cancelswitch(ic); 1226 } else { 1227 if (csa->csa_count <= 1) 1228 ieee80211_csa_completeswitch(ic); 1229 else 1230 ic->ic_csa_count = csa->csa_count; 1231 } 1232 } 1233done: 1234 IEEE80211_UNLOCK(ic); 1235} 1236 1237/* 1238 * Return non-zero if a background scan may be continued: 1239 * o bg scan is active 1240 * o no channel switch is pending 1241 * o there has not been any traffic recently 1242 * 1243 * Note we do not check if there is an administrative enable; 1244 * this is only done to start the scan. We assume that any 1245 * change in state will be accompanied by a request to cancel 1246 * active scans which will otherwise cause this test to fail. 1247 */ 1248static __inline int 1249contbgscan(struct ieee80211vap *vap) 1250{ 1251 struct ieee80211com *ic = vap->iv_ic; 1252 1253 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1254 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1255 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1256 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1257} 1258 1259/* 1260 * Return non-zero if a backgrond scan may be started: 1261 * o bg scanning is administratively enabled 1262 * o no channel switch is pending 1263 * o we are not boosted on a dynamic turbo channel 1264 * o there has not been a scan recently 1265 * o there has not been any traffic recently 1266 */ 1267static __inline int 1268startbgscan(struct ieee80211vap *vap) 1269{ 1270 struct ieee80211com *ic = vap->iv_ic; 1271 1272 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1273 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1274#ifdef IEEE80211_SUPPORT_SUPERG 1275 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1276#endif 1277 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1278 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1279} 1280 1281static void 1282sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1283 const struct ieee80211_rx_stats *rxs, 1284 int rssi, int nf) 1285{ 1286#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1287#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1288 struct ieee80211vap *vap = ni->ni_vap; 1289 struct ieee80211com *ic = ni->ni_ic; 1290 struct ieee80211_channel *rxchan = ic->ic_curchan; 1291 struct ieee80211_frame *wh; 1292 uint8_t *frm, *efrm; 1293 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1294 uint8_t rate; 1295 int ht_state_change = 0; 1296 1297 wh = mtod(m0, struct ieee80211_frame *); 1298 frm = (uint8_t *)&wh[1]; 1299 efrm = mtod(m0, uint8_t *) + m0->m_len; 1300 switch (subtype) { 1301 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1302 case IEEE80211_FC0_SUBTYPE_BEACON: { 1303 struct ieee80211_scanparams scan; 1304 struct ieee80211_channel *c; 1305 /* 1306 * We process beacon/probe response frames: 1307 * o when scanning, or 1308 * o station mode when associated (to collect state 1309 * updates such as 802.11g slot time) 1310 * Frames otherwise received are discarded. 1311 */ 1312 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1313 vap->iv_stats.is_rx_mgtdiscard++; 1314 return; 1315 } 1316 1317 /* Override RX channel as appropriate */ 1318 if (rxs != NULL) { 1319 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1320 if (c != NULL) 1321 rxchan = c; 1322 } 1323 1324 /* XXX probe response in sta mode when !scanning? */ 1325 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1326 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1327 vap->iv_stats.is_beacon_bad++; 1328 return; 1329 } 1330 1331 /* 1332 * Count frame now that we know it's to be processed. 1333 */ 1334 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1335 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1336 IEEE80211_NODE_STAT(ni, rx_beacons); 1337 } else 1338 IEEE80211_NODE_STAT(ni, rx_proberesp); 1339 /* 1340 * When operating in station mode, check for state updates. 1341 * Be careful to ignore beacons received while doing a 1342 * background scan. We consider only 11g/WMM stuff right now. 1343 */ 1344 if (ni->ni_associd != 0 && 1345 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1346 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1347 /* record tsf of last beacon */ 1348 memcpy(ni->ni_tstamp.data, scan.tstamp, 1349 sizeof(ni->ni_tstamp)); 1350 /* count beacon frame for s/w bmiss handling */ 1351 vap->iv_swbmiss_count++; 1352 vap->iv_bmiss_count = 0; 1353 if (ni->ni_erp != scan.erp) { 1354 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1355 wh->i_addr2, 1356 "erp change: was 0x%x, now 0x%x", 1357 ni->ni_erp, scan.erp); 1358 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1359 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1360 ic->ic_flags |= IEEE80211_F_USEPROT; 1361 else 1362 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1363 ni->ni_erp = scan.erp; 1364 /* XXX statistic */ 1365 /* XXX driver notification */ 1366 } 1367 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1368 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1369 wh->i_addr2, 1370 "capabilities change: was 0x%x, now 0x%x", 1371 ni->ni_capinfo, scan.capinfo); 1372 /* 1373 * NB: we assume short preamble doesn't 1374 * change dynamically 1375 */ 1376 ieee80211_set_shortslottime(ic, 1377 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1378 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1379 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1380 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1381 /* XXX statistic */ 1382 } 1383 if (scan.wme != NULL && 1384 (ni->ni_flags & IEEE80211_NODE_QOS) && 1385 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1386 ieee80211_wme_updateparams(vap); 1387#ifdef IEEE80211_SUPPORT_SUPERG 1388 if (scan.ath != NULL) 1389 ieee80211_parse_athparams(ni, scan.ath, wh); 1390#endif 1391 if (scan.htcap != NULL && scan.htinfo != NULL && 1392 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1393 /* XXX state changes? */ 1394 if (ieee80211_ht_updateparams(ni, 1395 scan.htcap, scan.htinfo)) 1396 ht_state_change = 1; 1397 } 1398 if (scan.quiet) 1399 ic->ic_set_quiet(ni, scan.quiet); 1400 1401 if (scan.tim != NULL) { 1402 struct ieee80211_tim_ie *tim = 1403 (struct ieee80211_tim_ie *) scan.tim; 1404 /* 1405 * XXX Check/debug this code; see if it's about 1406 * the right time to force the VAP awake if we 1407 * receive a frame destined for us? 1408 */ 1409 int aid = IEEE80211_AID(ni->ni_associd); 1410 int ix = aid / NBBY; 1411 int min = tim->tim_bitctl &~ 1; 1412 int max = tim->tim_len + min - 4; 1413 int tim_ucast = 0, tim_mcast = 0; 1414 1415 /* 1416 * Only do this for unicast traffic in the TIM 1417 * The multicast traffic notification for 1418 * the scan notification stuff should occur 1419 * differently. 1420 */ 1421 if (min <= ix && ix <= max && 1422 isset(tim->tim_bitmap - min, aid)) { 1423 tim_ucast = 1; 1424 } 1425 1426 /* 1427 * Do a separate notification 1428 * for the multicast bit being set. 1429 */ 1430 if (tim->tim_bitctl & 1) { 1431 tim_mcast = 1; 1432 } 1433 1434 /* 1435 * If the TIM indicates there's traffic for 1436 * us then get us out of STA mode powersave. 1437 */ 1438 if (tim_ucast == 1) { 1439 1440 /* 1441 * Wake us out of SLEEP state if we're 1442 * in it; and if we're doing bgscan 1443 * then wake us out of STA powersave. 1444 */ 1445 ieee80211_sta_tim_notify(vap, 1); 1446 1447 /* 1448 * This is preventing us from 1449 * continuing a bgscan; because it 1450 * tricks the contbgscan() 1451 * routine to think there's always 1452 * traffic for us. 1453 * 1454 * I think we need both an RX and 1455 * TX ic_lastdata field. 1456 */ 1457 ic->ic_lastdata = ticks; 1458 } 1459 1460 ni->ni_dtim_count = tim->tim_count; 1461 ni->ni_dtim_period = tim->tim_period; 1462 } 1463 if (scan.csa != NULL && 1464 (vap->iv_flags & IEEE80211_F_DOTH)) 1465 ieee80211_parse_csaparams(vap, scan.csa, wh); 1466 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1467 /* 1468 * No CSA ie or 11h disabled, but a channel 1469 * switch is pending; drop out so we aren't 1470 * stuck in CSA state. If the AP really is 1471 * moving we'll get a beacon miss and scan. 1472 */ 1473 IEEE80211_LOCK(ic); 1474 ieee80211_csa_cancelswitch(ic); 1475 IEEE80211_UNLOCK(ic); 1476 } 1477 /* 1478 * If scanning, pass the info to the scan module. 1479 * Otherwise, check if it's the right time to do 1480 * a background scan. Background scanning must 1481 * be enabled and we must not be operating in the 1482 * turbo phase of dynamic turbo mode. Then, 1483 * it's been a while since the last background 1484 * scan and if no data frames have come through 1485 * recently, kick off a scan. Note that this 1486 * is the mechanism by which a background scan 1487 * is started _and_ continued each time we 1488 * return on-channel to receive a beacon from 1489 * our ap. 1490 */ 1491 if (ic->ic_flags & IEEE80211_F_SCAN) { 1492 ieee80211_add_scan(vap, rxchan, 1493 &scan, wh, subtype, rssi, nf); 1494 } else if (contbgscan(vap)) { 1495 ieee80211_bg_scan(vap, 0); 1496 } else if (startbgscan(vap)) { 1497 vap->iv_stats.is_scan_bg++; 1498#if 0 1499 /* wakeup if we are sleeing */ 1500 ieee80211_set_pwrsave(vap, 0); 1501#endif 1502 ieee80211_bg_scan(vap, 0); 1503 } 1504 1505 /* 1506 * Put the station to sleep if we haven't seen 1507 * traffic in a while. 1508 */ 1509 IEEE80211_LOCK(ic); 1510 ieee80211_sta_ps_timer_check(vap); 1511 IEEE80211_UNLOCK(ic); 1512 1513 /* 1514 * If we've had a channel width change (eg HT20<->HT40) 1515 * then schedule a delayed driver notification. 1516 */ 1517 if (ht_state_change) 1518 ieee80211_update_chw(ic); 1519 return; 1520 } 1521 /* 1522 * If scanning, just pass information to the scan module. 1523 */ 1524 if (ic->ic_flags & IEEE80211_F_SCAN) { 1525 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1526 /* 1527 * Actively scanning a channel marked passive; 1528 * send a probe request now that we know there 1529 * is 802.11 traffic present. 1530 * 1531 * XXX check if the beacon we recv'd gives 1532 * us what we need and suppress the probe req 1533 */ 1534 ieee80211_probe_curchan(vap, 1); 1535 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1536 } 1537 ieee80211_add_scan(vap, rxchan, &scan, wh, 1538 subtype, rssi, nf); 1539 return; 1540 } 1541 break; 1542 } 1543 1544 case IEEE80211_FC0_SUBTYPE_AUTH: { 1545 uint16_t algo, seq, status; 1546 /* 1547 * auth frame format 1548 * [2] algorithm 1549 * [2] sequence 1550 * [2] status 1551 * [tlv*] challenge 1552 */ 1553 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1554 algo = le16toh(*(uint16_t *)frm); 1555 seq = le16toh(*(uint16_t *)(frm + 2)); 1556 status = le16toh(*(uint16_t *)(frm + 4)); 1557 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1558 "recv auth frame with algorithm %d seq %d", algo, seq); 1559 1560 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1561 IEEE80211_DISCARD(vap, 1562 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1563 wh, "auth", "%s", "TKIP countermeasures enabled"); 1564 vap->iv_stats.is_rx_auth_countermeasures++; 1565 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1566 ieee80211_send_error(ni, wh->i_addr2, 1567 IEEE80211_FC0_SUBTYPE_AUTH, 1568 IEEE80211_REASON_MIC_FAILURE); 1569 } 1570 return; 1571 } 1572 if (algo == IEEE80211_AUTH_ALG_SHARED) 1573 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1574 seq, status); 1575 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1576 sta_auth_open(ni, wh, rssi, nf, seq, status); 1577 else { 1578 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1579 wh, "auth", "unsupported alg %d", algo); 1580 vap->iv_stats.is_rx_auth_unsupported++; 1581 return; 1582 } 1583 break; 1584 } 1585 1586 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1587 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1588 uint16_t capinfo, associd; 1589 uint16_t status; 1590 1591 if (vap->iv_state != IEEE80211_S_ASSOC) { 1592 vap->iv_stats.is_rx_mgtdiscard++; 1593 return; 1594 } 1595 1596 /* 1597 * asresp frame format 1598 * [2] capability information 1599 * [2] status 1600 * [2] association ID 1601 * [tlv] supported rates 1602 * [tlv] extended supported rates 1603 * [tlv] WME 1604 * [tlv] HT capabilities 1605 * [tlv] HT info 1606 */ 1607 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1608 ni = vap->iv_bss; 1609 capinfo = le16toh(*(uint16_t *)frm); 1610 frm += 2; 1611 status = le16toh(*(uint16_t *)frm); 1612 frm += 2; 1613 if (status != 0) { 1614 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1615 wh->i_addr2, "%sassoc failed (reason %d)", 1616 ISREASSOC(subtype) ? "re" : "", status); 1617 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1618 return; 1619 } 1620 associd = le16toh(*(uint16_t *)frm); 1621 frm += 2; 1622 1623 rates = xrates = wme = htcap = htinfo = NULL; 1624 while (efrm - frm > 1) { 1625 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1626 switch (*frm) { 1627 case IEEE80211_ELEMID_RATES: 1628 rates = frm; 1629 break; 1630 case IEEE80211_ELEMID_XRATES: 1631 xrates = frm; 1632 break; 1633 case IEEE80211_ELEMID_HTCAP: 1634 htcap = frm; 1635 break; 1636 case IEEE80211_ELEMID_HTINFO: 1637 htinfo = frm; 1638 break; 1639 case IEEE80211_ELEMID_VENDOR: 1640 if (iswmeoui(frm)) 1641 wme = frm; 1642 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1643 /* 1644 * Accept pre-draft HT ie's if the 1645 * standard ones have not been seen. 1646 */ 1647 if (ishtcapoui(frm)) { 1648 if (htcap == NULL) 1649 htcap = frm; 1650 } else if (ishtinfooui(frm)) { 1651 if (htinfo == NULL) 1652 htinfo = frm; 1653 } 1654 } 1655 /* XXX Atheros OUI support */ 1656 break; 1657 } 1658 frm += frm[1] + 2; 1659 } 1660 1661 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1662 if (xrates != NULL) 1663 IEEE80211_VERIFY_ELEMENT(xrates, 1664 IEEE80211_RATE_MAXSIZE - rates[1], return); 1665 rate = ieee80211_setup_rates(ni, rates, xrates, 1666 IEEE80211_F_JOIN | 1667 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1668 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1669 if (rate & IEEE80211_RATE_BASIC) { 1670 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1671 wh->i_addr2, 1672 "%sassoc failed (rate set mismatch)", 1673 ISREASSOC(subtype) ? "re" : ""); 1674 vap->iv_stats.is_rx_assoc_norate++; 1675 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1676 IEEE80211_SCAN_FAIL_STATUS); 1677 return; 1678 } 1679 1680 ni->ni_capinfo = capinfo; 1681 ni->ni_associd = associd; 1682 if (ni->ni_jointime == 0) 1683 ni->ni_jointime = time_uptime; 1684 if (wme != NULL && 1685 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1686 ni->ni_flags |= IEEE80211_NODE_QOS; 1687 ieee80211_wme_updateparams(vap); 1688 } else 1689 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1690 /* 1691 * Setup HT state according to the negotiation. 1692 * 1693 * NB: shouldn't need to check if HT use is enabled but some 1694 * ap's send back HT ie's even when we don't indicate we 1695 * are HT capable in our AssocReq. 1696 */ 1697 if (htcap != NULL && htinfo != NULL && 1698 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1699 ieee80211_ht_node_init(ni); 1700 ieee80211_ht_updateparams(ni, htcap, htinfo); 1701 ieee80211_setup_htrates(ni, htcap, 1702 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1703 ieee80211_setup_basic_htrates(ni, htinfo); 1704 ieee80211_node_setuptxparms(ni); 1705 ieee80211_ratectl_node_init(ni); 1706 } else { 1707#ifdef IEEE80211_SUPPORT_SUPERG 1708 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1709 ieee80211_ff_node_init(ni); 1710#endif 1711 } 1712 /* 1713 * Configure state now that we are associated. 1714 * 1715 * XXX may need different/additional driver callbacks? 1716 */ 1717 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1718 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1719 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1720 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1721 } else { 1722 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1723 ic->ic_flags |= IEEE80211_F_USEBARKER; 1724 } 1725 ieee80211_set_shortslottime(ic, 1726 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1727 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1728 /* 1729 * Honor ERP protection. 1730 * 1731 * NB: ni_erp should zero for non-11g operation. 1732 */ 1733 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1734 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1735 ic->ic_flags |= IEEE80211_F_USEPROT; 1736 else 1737 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1738 IEEE80211_NOTE_MAC(vap, 1739 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1740 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1741 ISREASSOC(subtype) ? "re" : "", 1742 IEEE80211_NODE_AID(ni), 1743 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1744 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1745 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1746 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1747 ni->ni_flags & IEEE80211_NODE_HT ? 1748 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1749 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1750 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1751 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1752 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1753 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1754 ", fast-frames" : "", 1755 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1756 ", turbo" : "" 1757 ); 1758 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1759 break; 1760 } 1761 1762 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1763 uint16_t reason; 1764 1765 if (vap->iv_state == IEEE80211_S_SCAN) { 1766 vap->iv_stats.is_rx_mgtdiscard++; 1767 return; 1768 } 1769 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1770 /* NB: can happen when in promiscuous mode */ 1771 vap->iv_stats.is_rx_mgtdiscard++; 1772 break; 1773 } 1774 1775 /* 1776 * deauth frame format 1777 * [2] reason 1778 */ 1779 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1780 reason = le16toh(*(uint16_t *)frm); 1781 1782 vap->iv_stats.is_rx_deauth++; 1783 vap->iv_stats.is_rx_deauth_code = reason; 1784 IEEE80211_NODE_STAT(ni, rx_deauth); 1785 1786 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1787 "recv deauthenticate (reason %d)", reason); 1788 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1789 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1790 break; 1791 } 1792 1793 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1794 uint16_t reason; 1795 1796 if (vap->iv_state != IEEE80211_S_RUN && 1797 vap->iv_state != IEEE80211_S_ASSOC && 1798 vap->iv_state != IEEE80211_S_AUTH) { 1799 vap->iv_stats.is_rx_mgtdiscard++; 1800 return; 1801 } 1802 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1803 /* NB: can happen when in promiscuous mode */ 1804 vap->iv_stats.is_rx_mgtdiscard++; 1805 break; 1806 } 1807 1808 /* 1809 * disassoc frame format 1810 * [2] reason 1811 */ 1812 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1813 reason = le16toh(*(uint16_t *)frm); 1814 1815 vap->iv_stats.is_rx_disassoc++; 1816 vap->iv_stats.is_rx_disassoc_code = reason; 1817 IEEE80211_NODE_STAT(ni, rx_disassoc); 1818 1819 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1820 "recv disassociate (reason %d)", reason); 1821 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1822 break; 1823 } 1824 1825 case IEEE80211_FC0_SUBTYPE_ACTION: 1826 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1827 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1828 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1829 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1830 wh, NULL, "%s", "not for us"); 1831 vap->iv_stats.is_rx_mgtdiscard++; 1832 } else if (vap->iv_state != IEEE80211_S_RUN) { 1833 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1834 wh, NULL, "wrong state %s", 1835 ieee80211_state_name[vap->iv_state]); 1836 vap->iv_stats.is_rx_mgtdiscard++; 1837 } else { 1838 if (ieee80211_parse_action(ni, m0) == 0) 1839 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1840 } 1841 break; 1842 1843 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1844 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1845 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1846 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1847 case IEEE80211_FC0_SUBTYPE_ATIM: 1848 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1849 wh, NULL, "%s", "not handled"); 1850 vap->iv_stats.is_rx_mgtdiscard++; 1851 break; 1852 1853 default: 1854 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1855 wh, "mgt", "subtype 0x%x not handled", subtype); 1856 vap->iv_stats.is_rx_badsubtype++; 1857 break; 1858 } 1859#undef ISREASSOC 1860#undef ISPROBE 1861} 1862 1863static void 1864sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1865{ 1866 switch (subtype) { 1867 case IEEE80211_FC0_SUBTYPE_BAR: 1868 ieee80211_recv_bar(ni, m); 1869 break; 1870 } 1871} 1872