Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net80211/ieee80211_sta.c
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1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 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 70 static void sta_vattach(struct ieee80211vap *); 71 static void sta_beacon_miss(struct ieee80211vap *); 72 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 73 static int sta_input(struct ieee80211_node *, struct mbuf *, 74 const struct ieee80211_rx_stats *, int, int); 75 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 77 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 78 79 void 80 ieee80211_sta_attach(struct ieee80211com *ic) 81 { 82 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 83 } 84 85 void 86 ieee80211_sta_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 sta_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 sta_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 */ 111 static void 112 sta_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 157 158 /* 159 * If we receive a beacon miss interrupt when using 160 * dynamic turbo, attempt to switch modes before 161 * reassociating. 162 */ 163 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 164 ieee80211_dturbo_switch(vap, 165 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 166 #endif 167 /* 168 * Try to reassociate before scanning for a new ap. 169 */ 170 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 171 } else { 172 /* 173 * Somebody else is controlling state changes (e.g. 174 * a user-mode app) don't do anything that would 175 * confuse them; just drop into scan mode so they'll 176 * notified of the state change and given control. 177 */ 178 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 179 } 180 } 181 182 /* 183 * Handle deauth with reason. We retry only for 184 * the cases where we might succeed. Otherwise 185 * we downgrade the ap and scan. 186 */ 187 static void 188 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 189 { 190 switch (reason) { 191 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 192 case IEEE80211_STATUS_TIMEOUT: 193 case IEEE80211_REASON_ASSOC_EXPIRE: 194 case IEEE80211_REASON_NOT_AUTHED: 195 case IEEE80211_REASON_NOT_ASSOCED: 196 case IEEE80211_REASON_ASSOC_LEAVE: 197 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 198 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 199 break; 200 default: 201 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 202 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 203 ieee80211_check_scan_current(vap); 204 break; 205 } 206 } 207 208 static void 209 sta_swbmiss_start(struct ieee80211vap *vap) 210 { 211 212 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) { 213 /* 214 * Start s/w beacon miss timer for devices w/o 215 * hardware support. We fudge a bit here since 216 * we're doing this in software. 217 */ 218 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 219 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval); 220 vap->iv_swbmiss_count = 0; 221 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 222 ieee80211_swbmiss, vap); 223 } 224 } 225 226 /* 227 * IEEE80211_M_STA vap state machine handler. 228 * This routine handles the main states in the 802.11 protocol. 229 */ 230 static int 231 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 232 { 233 struct ieee80211com *ic = vap->iv_ic; 234 struct ieee80211_node *ni; 235 enum ieee80211_state ostate; 236 237 IEEE80211_LOCK_ASSERT(ic); 238 239 ostate = vap->iv_state; 240 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 241 __func__, ieee80211_state_name[ostate], 242 ieee80211_state_name[nstate], arg); 243 vap->iv_state = nstate; /* state transition */ 244 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 245 if (ostate != IEEE80211_S_SCAN) 246 ieee80211_cancel_scan(vap); /* background scan */ 247 ni = vap->iv_bss; /* NB: no reference held */ 248 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 249 callout_stop(&vap->iv_swbmiss); 250 switch (nstate) { 251 case IEEE80211_S_INIT: 252 switch (ostate) { 253 case IEEE80211_S_SLEEP: 254 /* XXX wakeup */ 255 /* XXX driver hook to wakeup the hardware? */ 256 case IEEE80211_S_RUN: 257 IEEE80211_SEND_MGMT(ni, 258 IEEE80211_FC0_SUBTYPE_DISASSOC, 259 IEEE80211_REASON_ASSOC_LEAVE); 260 ieee80211_sta_leave(ni); 261 break; 262 case IEEE80211_S_ASSOC: 263 IEEE80211_SEND_MGMT(ni, 264 IEEE80211_FC0_SUBTYPE_DEAUTH, 265 IEEE80211_REASON_AUTH_LEAVE); 266 break; 267 case IEEE80211_S_SCAN: 268 ieee80211_cancel_scan(vap); 269 break; 270 default: 271 break; 272 } 273 if (ostate != IEEE80211_S_INIT) { 274 /* NB: optimize INIT -> INIT case */ 275 ieee80211_reset_bss(vap); 276 } 277 if (vap->iv_auth->ia_detach != NULL) 278 vap->iv_auth->ia_detach(vap); 279 break; 280 case IEEE80211_S_SCAN: 281 switch (ostate) { 282 case IEEE80211_S_INIT: 283 /* 284 * Initiate a scan. We can come here as a result 285 * of an IEEE80211_IOC_SCAN_REQ too in which case 286 * the vap will be marked with IEEE80211_FEXT_SCANREQ 287 * and the scan request parameters will be present 288 * in iv_scanreq. Otherwise we do the default. 289 */ 290 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 291 ieee80211_check_scan(vap, 292 vap->iv_scanreq_flags, 293 vap->iv_scanreq_duration, 294 vap->iv_scanreq_mindwell, 295 vap->iv_scanreq_maxdwell, 296 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 297 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 298 } else 299 ieee80211_check_scan_current(vap); 300 break; 301 case IEEE80211_S_SCAN: 302 case IEEE80211_S_AUTH: 303 case IEEE80211_S_ASSOC: 304 /* 305 * These can happen either because of a timeout 306 * on an assoc/auth response or because of a 307 * change in state that requires a reset. For 308 * the former we're called with a non-zero arg 309 * that is the cause for the failure; pass this 310 * to the scan code so it can update state. 311 * Otherwise trigger a new scan unless we're in 312 * manual roaming mode in which case an application 313 * must issue an explicit scan request. 314 */ 315 if (arg != 0) 316 ieee80211_scan_assoc_fail(vap, 317 vap->iv_bss->ni_macaddr, arg); 318 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 319 ieee80211_check_scan_current(vap); 320 break; 321 case IEEE80211_S_SLEEP: /* beacon miss */ 322 /* 323 * XXX if in sleep we need to wakeup the hardware. 324 */ 325 /* FALLTHROUGH */ 326 case IEEE80211_S_RUN: /* beacon miss */ 327 /* 328 * Beacon miss. Notify user space and if not 329 * under control of a user application (roaming 330 * manual) kick off a scan to re-connect. 331 */ 332 333 ieee80211_sta_leave(ni); 334 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 335 ieee80211_check_scan_current(vap); 336 break; 337 default: 338 goto invalid; 339 } 340 break; 341 case IEEE80211_S_AUTH: 342 switch (ostate) { 343 case IEEE80211_S_INIT: 344 case IEEE80211_S_SCAN: 345 IEEE80211_SEND_MGMT(ni, 346 IEEE80211_FC0_SUBTYPE_AUTH, 1); 347 break; 348 case IEEE80211_S_AUTH: 349 case IEEE80211_S_ASSOC: 350 switch (arg & 0xff) { 351 case IEEE80211_FC0_SUBTYPE_AUTH: 352 /* ??? */ 353 IEEE80211_SEND_MGMT(ni, 354 IEEE80211_FC0_SUBTYPE_AUTH, 2); 355 break; 356 case IEEE80211_FC0_SUBTYPE_DEAUTH: 357 sta_authretry(vap, ni, arg>>8); 358 break; 359 } 360 break; 361 case IEEE80211_S_SLEEP: 362 case IEEE80211_S_RUN: 363 switch (arg & 0xff) { 364 case IEEE80211_FC0_SUBTYPE_AUTH: 365 IEEE80211_SEND_MGMT(ni, 366 IEEE80211_FC0_SUBTYPE_AUTH, 2); 367 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 368 break; 369 case IEEE80211_FC0_SUBTYPE_DEAUTH: 370 ieee80211_sta_leave(ni); 371 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 372 /* try to reauth */ 373 IEEE80211_SEND_MGMT(ni, 374 IEEE80211_FC0_SUBTYPE_AUTH, 1); 375 } 376 break; 377 } 378 break; 379 default: 380 goto invalid; 381 } 382 break; 383 case IEEE80211_S_ASSOC: 384 switch (ostate) { 385 case IEEE80211_S_AUTH: 386 case IEEE80211_S_ASSOC: 387 IEEE80211_SEND_MGMT(ni, 388 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 389 break; 390 case IEEE80211_S_SLEEP: /* cannot happen */ 391 case IEEE80211_S_RUN: 392 ieee80211_sta_leave(ni); 393 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 394 IEEE80211_SEND_MGMT(ni, arg ? 395 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 396 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 397 } 398 break; 399 default: 400 goto invalid; 401 } 402 break; 403 case IEEE80211_S_RUN: 404 if (vap->iv_flags & IEEE80211_F_WPA) { 405 /* XXX validate prerequisites */ 406 } 407 switch (ostate) { 408 case IEEE80211_S_RUN: 409 case IEEE80211_S_CSA: 410 break; 411 case IEEE80211_S_AUTH: /* when join is done in fw */ 412 case IEEE80211_S_ASSOC: 413 #ifdef IEEE80211_DEBUG 414 if (ieee80211_msg_debug(vap)) { 415 ieee80211_note(vap, "%s with %s ssid ", 416 (vap->iv_opmode == IEEE80211_M_STA ? 417 "associated" : "synchronized"), 418 ether_sprintf(ni->ni_bssid)); 419 ieee80211_print_essid(vap->iv_bss->ni_essid, 420 ni->ni_esslen); 421 /* XXX MCS/HT */ 422 printf(" channel %d start %uMb\n", 423 ieee80211_chan2ieee(ic, ic->ic_curchan), 424 IEEE80211_RATE2MBS(ni->ni_txrate)); 425 } 426 #endif 427 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 428 ieee80211_notify_node_join(ni, 429 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 430 break; 431 case IEEE80211_S_SLEEP: 432 /* Wake up from sleep */ 433 vap->iv_sta_ps(vap, 0); 434 break; 435 default: 436 goto invalid; 437 } 438 ieee80211_sync_curchan(ic); 439 if (ostate != IEEE80211_S_RUN) 440 sta_swbmiss_start(vap); 441 /* 442 * When 802.1x is not in use mark the port authorized 443 * at this point so traffic can flow. 444 */ 445 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 446 ieee80211_node_authorize(ni); 447 /* 448 * Fake association when joining an existing bss. 449 * 450 * Don't do this if we're doing SLEEP->RUN. 451 */ 452 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 453 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 454 break; 455 case IEEE80211_S_CSA: 456 if (ostate != IEEE80211_S_RUN) 457 goto invalid; 458 break; 459 case IEEE80211_S_SLEEP: 460 sta_swbmiss_start(vap); 461 vap->iv_sta_ps(vap, 1); 462 break; 463 default: 464 invalid: 465 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 466 "%s: unexpected state transition %s -> %s\n", __func__, 467 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 468 break; 469 } 470 return 0; 471 } 472 473 /* 474 * Return non-zero if the frame is an echo of a multicast 475 * frame sent by ourself. The dir is known to be DSTODS. 476 */ 477 static __inline int 478 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 479 { 480 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 481 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 482 const uint8_t *sa; 483 484 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 485 486 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 487 return 0; 488 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 489 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 490 #undef WH4 491 #undef QWH4 492 } 493 494 /* 495 * Return non-zero if the frame is an echo of a multicast 496 * frame sent by ourself. The dir is known to be FROMDS. 497 */ 498 static __inline int 499 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 500 { 501 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 502 503 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 504 return 0; 505 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 506 } 507 508 /* 509 * Decide if a received management frame should be 510 * printed when debugging is enabled. This filters some 511 * of the less interesting frames that come frequently 512 * (e.g. beacons). 513 */ 514 static __inline int 515 doprint(struct ieee80211vap *vap, int subtype) 516 { 517 switch (subtype) { 518 case IEEE80211_FC0_SUBTYPE_BEACON: 519 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 520 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 521 return 0; 522 } 523 return 1; 524 } 525 526 /* 527 * Process a received frame. The node associated with the sender 528 * should be supplied. If nothing was found in the node table then 529 * the caller is assumed to supply a reference to iv_bss instead. 530 * The RSSI and a timestamp are also supplied. The RSSI data is used 531 * during AP scanning to select a AP to associate with; it can have 532 * any units so long as values have consistent units and higher values 533 * mean ``better signal''. The receive timestamp is currently not used 534 * by the 802.11 layer. 535 */ 536 static int 537 sta_input(struct ieee80211_node *ni, struct mbuf *m, 538 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 539 { 540 struct ieee80211vap *vap = ni->ni_vap; 541 struct ieee80211com *ic = ni->ni_ic; 542 struct ifnet *ifp = vap->iv_ifp; 543 struct ieee80211_frame *wh; 544 struct ieee80211_key *key; 545 struct ether_header *eh; 546 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 547 uint8_t dir, type, subtype, qos; 548 uint8_t *bssid; 549 550 if (m->m_flags & M_AMPDU_MPDU) { 551 /* 552 * Fastpath for A-MPDU reorder q resubmission. Frames 553 * w/ M_AMPDU_MPDU marked have already passed through 554 * here but were received out of order and been held on 555 * the reorder queue. When resubmitted they are marked 556 * with the M_AMPDU_MPDU flag and we can bypass most of 557 * the normal processing. 558 */ 559 wh = mtod(m, struct ieee80211_frame *); 560 type = IEEE80211_FC0_TYPE_DATA; 561 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 562 subtype = IEEE80211_FC0_SUBTYPE_QOS; 563 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 564 goto resubmit_ampdu; 565 } 566 567 KASSERT(ni != NULL, ("null node")); 568 ni->ni_inact = ni->ni_inact_reload; 569 570 type = -1; /* undefined */ 571 572 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 573 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 574 ni->ni_macaddr, NULL, 575 "too short (1): len %u", m->m_pkthdr.len); 576 vap->iv_stats.is_rx_tooshort++; 577 goto out; 578 } 579 /* 580 * Bit of a cheat here, we use a pointer for a 3-address 581 * frame format but don't reference fields past outside 582 * ieee80211_frame_min w/o first validating the data is 583 * present. 584 */ 585 wh = mtod(m, struct ieee80211_frame *); 586 587 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 588 IEEE80211_FC0_VERSION_0) { 589 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 590 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 591 wh->i_fc[0], wh->i_fc[1]); 592 vap->iv_stats.is_rx_badversion++; 593 goto err; 594 } 595 596 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 597 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 598 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 599 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 600 bssid = wh->i_addr2; 601 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 602 /* not interested in */ 603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 604 bssid, NULL, "%s", "not to bss"); 605 vap->iv_stats.is_rx_wrongbss++; 606 goto out; 607 } 608 609 /* 610 * Some devices may be in a promiscuous mode 611 * where they receive frames for multiple station 612 * addresses. 613 * 614 * If we receive a data frame that isn't 615 * destined to our VAP MAC, drop it. 616 * 617 * XXX TODO: This is only enforced when not scanning; 618 * XXX it assumes a software-driven scan will put the NIC 619 * XXX into a "no data frames" mode before setting this 620 * XXX flag. Otherwise it may be possible that we'll still 621 * XXX process data frames whilst scanning. 622 */ 623 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 624 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 625 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 626 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 627 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 628 vap->iv_stats.is_rx_wrongbss++; 629 goto out; 630 } 631 632 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 633 ni->ni_noise = nf; 634 if ( IEEE80211_HAS_SEQ(type, subtype) && 635 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 636 uint8_t tid = ieee80211_gettid(wh); 637 if (IEEE80211_QOS_HAS_SEQ(wh) && 638 TID_TO_WME_AC(tid) >= WME_AC_VI) 639 ic->ic_wme.wme_hipri_traffic++; 640 if (! ieee80211_check_rxseq(ni, wh, bssid)) 641 goto out; 642 } 643 } 644 645 switch (type) { 646 case IEEE80211_FC0_TYPE_DATA: 647 hdrspace = ieee80211_hdrspace(ic, wh); 648 if (m->m_len < hdrspace && 649 (m = m_pullup(m, hdrspace)) == NULL) { 650 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 651 ni->ni_macaddr, NULL, 652 "data too short: expecting %u", hdrspace); 653 vap->iv_stats.is_rx_tooshort++; 654 goto out; /* XXX */ 655 } 656 /* 657 * Handle A-MPDU re-ordering. If the frame is to be 658 * processed directly then ieee80211_ampdu_reorder 659 * will return 0; otherwise it has consumed the mbuf 660 * and we should do nothing more with it. 661 */ 662 if ((m->m_flags & M_AMPDU) && 663 (dir == IEEE80211_FC1_DIR_FROMDS || 664 dir == IEEE80211_FC1_DIR_DSTODS) && 665 ieee80211_ampdu_reorder(ni, m) != 0) { 666 m = NULL; 667 goto out; 668 } 669 resubmit_ampdu: 670 if (dir == IEEE80211_FC1_DIR_FROMDS) { 671 if ((ifp->if_flags & IFF_SIMPLEX) && 672 isfromds_mcastecho(vap, wh)) { 673 /* 674 * In IEEE802.11 network, multicast 675 * packets sent from "me" are broadcast 676 * from the AP; silently discard for 677 * SIMPLEX interface. 678 */ 679 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 680 wh, "data", "%s", "multicast echo"); 681 vap->iv_stats.is_rx_mcastecho++; 682 goto out; 683 } 684 if ((vap->iv_flags & IEEE80211_F_DWDS) && 685 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 686 /* 687 * DWDS sta's must drop 3-address mcast frames 688 * as they will be sent separately as a 4-addr 689 * frame. Accepting the 3-addr frame will 690 * confuse the bridge into thinking the sending 691 * sta is located at the end of WDS link. 692 */ 693 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 694 "3-address data", "%s", "DWDS enabled"); 695 vap->iv_stats.is_rx_mcastecho++; 696 goto out; 697 } 698 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 699 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 700 IEEE80211_DISCARD(vap, 701 IEEE80211_MSG_INPUT, wh, "4-address data", 702 "%s", "DWDS not enabled"); 703 vap->iv_stats.is_rx_wrongdir++; 704 goto out; 705 } 706 if ((ifp->if_flags & IFF_SIMPLEX) && 707 isdstods_mcastecho(vap, wh)) { 708 /* 709 * In IEEE802.11 network, multicast 710 * packets sent from "me" are broadcast 711 * from the AP; silently discard for 712 * SIMPLEX interface. 713 */ 714 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 715 "4-address data", "%s", "multicast echo"); 716 vap->iv_stats.is_rx_mcastecho++; 717 goto out; 718 } 719 } else { 720 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 721 "data", "incorrect dir 0x%x", dir); 722 vap->iv_stats.is_rx_wrongdir++; 723 goto out; 724 } 725 726 /* 727 * Handle privacy requirements. Note that we 728 * must not be preempted from here until after 729 * we (potentially) call ieee80211_crypto_demic; 730 * otherwise we may violate assumptions in the 731 * crypto cipher modules used to do delayed update 732 * of replay sequence numbers. 733 */ 734 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 735 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 736 /* 737 * Discard encrypted frames when privacy is off. 738 */ 739 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 740 wh, "WEP", "%s", "PRIVACY off"); 741 vap->iv_stats.is_rx_noprivacy++; 742 IEEE80211_NODE_STAT(ni, rx_noprivacy); 743 goto out; 744 } 745 key = ieee80211_crypto_decap(ni, m, hdrspace); 746 if (key == NULL) { 747 /* NB: stats+msgs handled in crypto_decap */ 748 IEEE80211_NODE_STAT(ni, rx_wepfail); 749 goto out; 750 } 751 wh = mtod(m, struct ieee80211_frame *); 752 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 753 } else { 754 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 755 key = NULL; 756 } 757 758 /* 759 * Save QoS bits for use below--before we strip the header. 760 */ 761 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) 762 qos = ieee80211_getqos(wh)[0]; 763 else 764 qos = 0; 765 766 /* 767 * Next up, any fragmentation. 768 */ 769 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 770 m = ieee80211_defrag(ni, m, hdrspace); 771 if (m == NULL) { 772 /* Fragment dropped or frame not complete yet */ 773 goto out; 774 } 775 } 776 wh = NULL; /* no longer valid, catch any uses */ 777 778 /* 779 * Next strip any MSDU crypto bits. 780 */ 781 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 782 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 783 ni->ni_macaddr, "data", "%s", "demic error"); 784 vap->iv_stats.is_rx_demicfail++; 785 IEEE80211_NODE_STAT(ni, rx_demicfail); 786 goto out; 787 } 788 789 /* copy to listener after decrypt */ 790 if (ieee80211_radiotap_active_vap(vap)) 791 ieee80211_radiotap_rx(vap, m); 792 need_tap = 0; 793 794 /* 795 * Finally, strip the 802.11 header. 796 */ 797 m = ieee80211_decap(vap, m, hdrspace); 798 if (m == NULL) { 799 /* XXX mask bit to check for both */ 800 /* don't count Null data frames as errors */ 801 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 802 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 803 goto out; 804 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 805 ni->ni_macaddr, "data", "%s", "decap error"); 806 vap->iv_stats.is_rx_decap++; 807 IEEE80211_NODE_STAT(ni, rx_decap); 808 goto err; 809 } 810 eh = mtod(m, struct ether_header *); 811 if (!ieee80211_node_is_authorized(ni)) { 812 /* 813 * Deny any non-PAE frames received prior to 814 * authorization. For open/shared-key 815 * authentication the port is mark authorized 816 * after authentication completes. For 802.1x 817 * the port is not marked authorized by the 818 * authenticator until the handshake has completed. 819 */ 820 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 821 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 822 eh->ether_shost, "data", 823 "unauthorized port: ether type 0x%x len %u", 824 eh->ether_type, m->m_pkthdr.len); 825 vap->iv_stats.is_rx_unauth++; 826 IEEE80211_NODE_STAT(ni, rx_unauth); 827 goto err; 828 } 829 } else { 830 /* 831 * When denying unencrypted frames, discard 832 * any non-PAE frames received without encryption. 833 */ 834 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 835 (key == NULL && (m->m_flags & M_WEP) == 0) && 836 eh->ether_type != htons(ETHERTYPE_PAE)) { 837 /* 838 * Drop unencrypted frames. 839 */ 840 vap->iv_stats.is_rx_unencrypted++; 841 IEEE80211_NODE_STAT(ni, rx_unencrypted); 842 goto out; 843 } 844 } 845 /* XXX require HT? */ 846 if (qos & IEEE80211_QOS_AMSDU) { 847 m = ieee80211_decap_amsdu(ni, m); 848 if (m == NULL) 849 return IEEE80211_FC0_TYPE_DATA; 850 } else { 851 #ifdef IEEE80211_SUPPORT_SUPERG 852 m = ieee80211_decap_fastframe(vap, ni, m); 853 if (m == NULL) 854 return IEEE80211_FC0_TYPE_DATA; 855 #endif 856 } 857 ieee80211_deliver_data(vap, ni, m); 858 return IEEE80211_FC0_TYPE_DATA; 859 860 case IEEE80211_FC0_TYPE_MGT: 861 vap->iv_stats.is_rx_mgmt++; 862 IEEE80211_NODE_STAT(ni, rx_mgmt); 863 if (dir != IEEE80211_FC1_DIR_NODS) { 864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 865 wh, "data", "incorrect dir 0x%x", dir); 866 vap->iv_stats.is_rx_wrongdir++; 867 goto err; 868 } 869 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 870 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 871 ni->ni_macaddr, "mgt", "too short: len %u", 872 m->m_pkthdr.len); 873 vap->iv_stats.is_rx_tooshort++; 874 goto out; 875 } 876 #ifdef IEEE80211_DEBUG 877 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 878 ieee80211_msg_dumppkts(vap)) { 879 if_printf(ifp, "received %s from %s rssi %d\n", 880 ieee80211_mgt_subtype_name(subtype), 881 ether_sprintf(wh->i_addr2), rssi); 882 } 883 #endif 884 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 885 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 886 /* 887 * Only shared key auth frames with a challenge 888 * should be encrypted, discard all others. 889 */ 890 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 891 wh, ieee80211_mgt_subtype_name(subtype), 892 "%s", "WEP set but not permitted"); 893 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 894 goto out; 895 } 896 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 897 /* 898 * Discard encrypted frames when privacy is off. 899 */ 900 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 901 wh, "mgt", "%s", "WEP set but PRIVACY off"); 902 vap->iv_stats.is_rx_noprivacy++; 903 goto out; 904 } 905 hdrspace = ieee80211_hdrspace(ic, wh); 906 key = ieee80211_crypto_decap(ni, m, hdrspace); 907 if (key == NULL) { 908 /* NB: stats+msgs handled in crypto_decap */ 909 goto out; 910 } 911 wh = mtod(m, struct ieee80211_frame *); 912 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 913 } 914 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 915 goto out; 916 917 case IEEE80211_FC0_TYPE_CTL: 918 vap->iv_stats.is_rx_ctl++; 919 IEEE80211_NODE_STAT(ni, rx_ctrl); 920 vap->iv_recv_ctl(ni, m, subtype); 921 goto out; 922 923 default: 924 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 925 wh, NULL, "bad frame type 0x%x", type); 926 /* should not come here */ 927 break; 928 } 929 err: 930 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 931 out: 932 if (m != NULL) { 933 if (need_tap && ieee80211_radiotap_active_vap(vap)) 934 ieee80211_radiotap_rx(vap, m); 935 m_freem(m); 936 } 937 return type; 938 } 939 940 static void 941 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 942 int rssi, int nf, uint16_t seq, uint16_t status) 943 { 944 struct ieee80211vap *vap = ni->ni_vap; 945 946 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 947 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 948 ni->ni_macaddr, "open auth", 949 "bad sta auth mode %u", ni->ni_authmode); 950 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 951 return; 952 } 953 if (vap->iv_state != IEEE80211_S_AUTH || 954 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 955 vap->iv_stats.is_rx_bad_auth++; 956 return; 957 } 958 if (status != 0) { 959 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 960 ni, "open auth failed (reason %d)", status); 961 vap->iv_stats.is_rx_auth_fail++; 962 vap->iv_stats.is_rx_authfail_code = status; 963 ieee80211_new_state(vap, IEEE80211_S_SCAN, 964 IEEE80211_SCAN_FAIL_STATUS); 965 } else 966 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 967 } 968 969 static void 970 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 971 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 972 uint16_t seq, uint16_t status) 973 { 974 struct ieee80211vap *vap = ni->ni_vap; 975 uint8_t *challenge; 976 977 /* 978 * NB: this can happen as we allow pre-shared key 979 * authentication to be enabled w/o wep being turned 980 * on so that configuration of these can be done 981 * in any order. It may be better to enforce the 982 * ordering in which case this check would just be 983 * for sanity/consistency. 984 */ 985 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 986 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 987 ni->ni_macaddr, "shared key auth", 988 "%s", " PRIVACY is disabled"); 989 goto bad; 990 } 991 /* 992 * Pre-shared key authentication is evil; accept 993 * it only if explicitly configured (it is supported 994 * mainly for compatibility with clients like OS X). 995 */ 996 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 997 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 998 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 999 ni->ni_macaddr, "shared key auth", 1000 "bad sta auth mode %u", ni->ni_authmode); 1001 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1002 goto bad; 1003 } 1004 1005 challenge = NULL; 1006 if (frm + 1 < efrm) { 1007 if ((frm[1] + 2) > (efrm - frm)) { 1008 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1009 ni->ni_macaddr, "shared key auth", 1010 "ie %d/%d too long", 1011 frm[0], (frm[1] + 2) - (efrm - frm)); 1012 vap->iv_stats.is_rx_bad_auth++; 1013 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 goto bad; 1028 } 1029 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1030 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1031 ni->ni_macaddr, "shared key auth", 1032 "bad challenge len %d", challenge[1]); 1033 vap->iv_stats.is_rx_bad_auth++; 1034 goto bad; 1035 } 1036 default: 1037 break; 1038 } 1039 if (vap->iv_state != IEEE80211_S_AUTH) 1040 return; 1041 switch (seq) { 1042 case IEEE80211_AUTH_SHARED_PASS: 1043 if (ni->ni_challenge != NULL) { 1044 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1045 ni->ni_challenge = NULL; 1046 } 1047 if (status != 0) { 1048 IEEE80211_NOTE_FRAME(vap, 1049 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1050 "shared key auth failed (reason %d)", status); 1051 vap->iv_stats.is_rx_auth_fail++; 1052 vap->iv_stats.is_rx_authfail_code = status; 1053 return; 1054 } 1055 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1056 break; 1057 case IEEE80211_AUTH_SHARED_CHALLENGE: 1058 if (!ieee80211_alloc_challenge(ni)) 1059 return; 1060 /* XXX could optimize by passing recvd challenge */ 1061 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1062 IEEE80211_SEND_MGMT(ni, 1063 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1064 break; 1065 default: 1066 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1067 wh, "shared key auth", "bad seq %d", seq); 1068 vap->iv_stats.is_rx_bad_auth++; 1069 return; 1070 } 1071 return; 1072 bad: 1073 /* 1074 * Kick the state machine. This short-circuits 1075 * using the mgt frame timeout to trigger the 1076 * state transition. 1077 */ 1078 if (vap->iv_state == IEEE80211_S_AUTH) 1079 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1080 IEEE80211_SCAN_FAIL_STATUS); 1081 } 1082 1083 int 1084 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1085 const struct ieee80211_frame *wh) 1086 { 1087 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1088 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1089 u_int len = frm[1], qosinfo; 1090 int i; 1091 1092 if (len < sizeof(struct ieee80211_wme_param)-2) { 1093 IEEE80211_DISCARD_IE(vap, 1094 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1095 wh, "WME", "too short, len %u", len); 1096 return -1; 1097 } 1098 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1099 qosinfo &= WME_QOSINFO_COUNT; 1100 /* XXX do proper check for wraparound */ 1101 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1102 return 0; 1103 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1104 for (i = 0; i < WME_NUM_AC; i++) { 1105 struct wmeParams *wmep = 1106 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1107 /* NB: ACI not used */ 1108 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1109 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1110 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1111 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1112 wmep->wmep_txopLimit = le16dec(frm+2); 1113 frm += 4; 1114 } 1115 wme->wme_wmeChanParams.cap_info = qosinfo; 1116 return 1; 1117 #undef MS 1118 } 1119 1120 /* 1121 * Process 11h Channel Switch Announcement (CSA) ie. If this 1122 * is the first CSA then initiate the switch. Otherwise we 1123 * track state and trigger completion and/or cancel of the switch. 1124 * XXX should be public for IBSS use 1125 */ 1126 static void 1127 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1128 const struct ieee80211_frame *wh) 1129 { 1130 struct ieee80211com *ic = vap->iv_ic; 1131 const struct ieee80211_csa_ie *csa = 1132 (const struct ieee80211_csa_ie *) frm; 1133 1134 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1135 ("state %s", ieee80211_state_name[vap->iv_state])); 1136 1137 if (csa->csa_mode > 1) { 1138 IEEE80211_DISCARD_IE(vap, 1139 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1140 wh, "CSA", "invalid mode %u", csa->csa_mode); 1141 return; 1142 } 1143 IEEE80211_LOCK(ic); 1144 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1145 /* 1146 * Convert the channel number to a channel reference. We 1147 * try first to preserve turbo attribute of the current 1148 * channel then fallback. Note this will not work if the 1149 * CSA specifies a channel that requires a band switch (e.g. 1150 * 11a => 11g). This is intentional as 11h is defined only 1151 * for 5GHz/11a and because the switch does not involve a 1152 * reassociation, protocol state (capabilities, negotated 1153 * rates, etc) may/will be wrong. 1154 */ 1155 struct ieee80211_channel *c = 1156 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1157 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1158 if (c == NULL) { 1159 c = ieee80211_find_channel_byieee(ic, 1160 csa->csa_newchan, 1161 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1162 if (c == NULL) { 1163 IEEE80211_DISCARD_IE(vap, 1164 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1165 wh, "CSA", "invalid channel %u", 1166 csa->csa_newchan); 1167 goto done; 1168 } 1169 } 1170 #if IEEE80211_CSA_COUNT_MIN > 0 1171 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1172 /* 1173 * Require at least IEEE80211_CSA_COUNT_MIN count to 1174 * reduce the risk of being redirected by a fabricated 1175 * CSA. If a valid CSA is dropped we'll still get a 1176 * beacon miss when the AP leaves the channel so we'll 1177 * eventually follow to the new channel. 1178 * 1179 * NOTE: this violates the 11h spec that states that 1180 * count may be any value and if 0 then a switch 1181 * should happen asap. 1182 */ 1183 IEEE80211_DISCARD_IE(vap, 1184 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1185 wh, "CSA", "count %u too small, must be >= %u", 1186 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1187 goto done; 1188 } 1189 #endif 1190 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1191 } else { 1192 /* 1193 * Validate this ie against the initial CSA. We require 1194 * mode and channel not change and the count must be 1195 * monotonically decreasing. This may be pointless and 1196 * canceling the switch as a result may be too paranoid but 1197 * in the worst case if we drop out of CSA because of this 1198 * and the AP does move then we'll just end up taking a 1199 * beacon miss and scan to find the AP. 1200 * 1201 * XXX may want <= on count as we also process ProbeResp 1202 * frames and those may come in w/ the same count as the 1203 * previous beacon; but doing so leaves us open to a stuck 1204 * count until we add a dead-man timer 1205 */ 1206 if (!(csa->csa_count < ic->ic_csa_count && 1207 csa->csa_mode == ic->ic_csa_mode && 1208 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1209 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1210 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1211 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1212 ic->ic_csa_newchan, ic->ic_csa_count, 1213 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1214 ieee80211_csa_cancelswitch(ic); 1215 } else { 1216 if (csa->csa_count <= 1) 1217 ieee80211_csa_completeswitch(ic); 1218 else 1219 ic->ic_csa_count = csa->csa_count; 1220 } 1221 } 1222 done: 1223 IEEE80211_UNLOCK(ic); 1224 } 1225 1226 /* 1227 * Return non-zero if a background scan may be continued: 1228 * o bg scan is active 1229 * o no channel switch is pending 1230 * o there has not been any traffic recently 1231 * 1232 * Note we do not check if there is an administrative enable; 1233 * this is only done to start the scan. We assume that any 1234 * change in state will be accompanied by a request to cancel 1235 * active scans which will otherwise cause this test to fail. 1236 */ 1237 static __inline int 1238 contbgscan(struct ieee80211vap *vap) 1239 { 1240 struct ieee80211com *ic = vap->iv_ic; 1241 1242 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1243 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1244 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1245 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1246 } 1247 1248 /* 1249 * Return non-zero if a backgrond scan may be started: 1250 * o bg scanning is administratively enabled 1251 * o no channel switch is pending 1252 * o we are not boosted on a dynamic turbo channel 1253 * o there has not been a scan recently 1254 * o there has not been any traffic recently 1255 */ 1256 static __inline int 1257 startbgscan(struct ieee80211vap *vap) 1258 { 1259 struct ieee80211com *ic = vap->iv_ic; 1260 1261 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1262 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1263 #ifdef IEEE80211_SUPPORT_SUPERG 1264 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1265 #endif 1266 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1267 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1268 } 1269 1270 static void 1271 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1272 const struct ieee80211_rx_stats *rxs, 1273 int rssi, int nf) 1274 { 1275 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1276 struct ieee80211vap *vap = ni->ni_vap; 1277 struct ieee80211com *ic = ni->ni_ic; 1278 struct ieee80211_channel *rxchan = ic->ic_curchan; 1279 struct ieee80211_frame *wh; 1280 uint8_t *frm, *efrm; 1281 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1282 uint8_t rate; 1283 int ht_state_change = 0; 1284 1285 wh = mtod(m0, struct ieee80211_frame *); 1286 frm = (uint8_t *)&wh[1]; 1287 efrm = mtod(m0, uint8_t *) + m0->m_len; 1288 switch (subtype) { 1289 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1290 case IEEE80211_FC0_SUBTYPE_BEACON: { 1291 struct ieee80211_scanparams scan; 1292 struct ieee80211_channel *c; 1293 /* 1294 * We process beacon/probe response frames: 1295 * o when scanning, or 1296 * o station mode when associated (to collect state 1297 * updates such as 802.11g slot time) 1298 * Frames otherwise received are discarded. 1299 */ 1300 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1301 vap->iv_stats.is_rx_mgtdiscard++; 1302 return; 1303 } 1304 1305 /* Override RX channel as appropriate */ 1306 if (rxs != NULL) { 1307 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1308 if (c != NULL) 1309 rxchan = c; 1310 } 1311 1312 /* XXX probe response in sta mode when !scanning? */ 1313 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1314 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1315 vap->iv_stats.is_beacon_bad++; 1316 return; 1317 } 1318 1319 /* 1320 * Count frame now that we know it's to be processed. 1321 */ 1322 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1323 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1324 IEEE80211_NODE_STAT(ni, rx_beacons); 1325 } else 1326 IEEE80211_NODE_STAT(ni, rx_proberesp); 1327 /* 1328 * When operating in station mode, check for state updates. 1329 * Be careful to ignore beacons received while doing a 1330 * background scan. We consider only 11g/WMM stuff right now. 1331 */ 1332 if (ni->ni_associd != 0 && 1333 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1334 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1335 /* record tsf of last beacon */ 1336 memcpy(ni->ni_tstamp.data, scan.tstamp, 1337 sizeof(ni->ni_tstamp)); 1338 /* count beacon frame for s/w bmiss handling */ 1339 vap->iv_swbmiss_count++; 1340 vap->iv_bmiss_count = 0; 1341 if (ni->ni_erp != scan.erp) { 1342 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1343 wh->i_addr2, 1344 "erp change: was 0x%x, now 0x%x", 1345 ni->ni_erp, scan.erp); 1346 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1347 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1348 ic->ic_flags |= IEEE80211_F_USEPROT; 1349 else 1350 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1351 ni->ni_erp = scan.erp; 1352 /* XXX statistic */ 1353 /* XXX driver notification */ 1354 } 1355 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1356 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1357 wh->i_addr2, 1358 "capabilities change: was 0x%x, now 0x%x", 1359 ni->ni_capinfo, scan.capinfo); 1360 /* 1361 * NB: we assume short preamble doesn't 1362 * change dynamically 1363 */ 1364 ieee80211_set_shortslottime(ic, 1365 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1366 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1367 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1368 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1369 /* XXX statistic */ 1370 } 1371 if (scan.wme != NULL && 1372 (ni->ni_flags & IEEE80211_NODE_QOS) && 1373 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1374 ieee80211_wme_updateparams(vap); 1375 #ifdef IEEE80211_SUPPORT_SUPERG 1376 if (scan.ath != NULL) 1377 ieee80211_parse_athparams(ni, scan.ath, wh); 1378 #endif 1379 if (scan.htcap != NULL && scan.htinfo != NULL && 1380 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1381 /* XXX state changes? */ 1382 if (ieee80211_ht_updateparams(ni, 1383 scan.htcap, scan.htinfo)) 1384 ht_state_change = 1; 1385 } 1386 if (scan.quiet) 1387 ic->ic_set_quiet(ni, scan.quiet); 1388 1389 if (scan.tim != NULL) { 1390 struct ieee80211_tim_ie *tim = 1391 (struct ieee80211_tim_ie *) scan.tim; 1392 /* 1393 * XXX Check/debug this code; see if it's about 1394 * the right time to force the VAP awake if we 1395 * receive a frame destined for us? 1396 */ 1397 int aid = IEEE80211_AID(ni->ni_associd); 1398 int ix = aid / NBBY; 1399 int min = tim->tim_bitctl &~ 1; 1400 int max = tim->tim_len + min - 4; 1401 int tim_ucast = 0, tim_mcast = 0; 1402 1403 /* 1404 * Only do this for unicast traffic in the TIM 1405 * The multicast traffic notification for 1406 * the scan notification stuff should occur 1407 * differently. 1408 */ 1409 if (min <= ix && ix <= max && 1410 isset(tim->tim_bitmap - min, aid)) { 1411 tim_ucast = 1; 1412 } 1413 1414 /* 1415 * Do a separate notification 1416 * for the multicast bit being set. 1417 */ 1418 if (tim->tim_bitctl & 1) { 1419 tim_mcast = 1; 1420 } 1421 1422 /* 1423 * If the TIM indicates there's traffic for 1424 * us then get us out of STA mode powersave. 1425 */ 1426 if (tim_ucast == 1) { 1427 1428 /* 1429 * Wake us out of SLEEP state if we're 1430 * in it; and if we're doing bgscan 1431 * then wake us out of STA powersave. 1432 */ 1433 ieee80211_sta_tim_notify(vap, 1); 1434 1435 /* 1436 * This is preventing us from 1437 * continuing a bgscan; because it 1438 * tricks the contbgscan() 1439 * routine to think there's always 1440 * traffic for us. 1441 * 1442 * I think we need both an RX and 1443 * TX ic_lastdata field. 1444 */ 1445 ic->ic_lastdata = ticks; 1446 } 1447 1448 ni->ni_dtim_count = tim->tim_count; 1449 ni->ni_dtim_period = tim->tim_period; 1450 } 1451 if (scan.csa != NULL && 1452 (vap->iv_flags & IEEE80211_F_DOTH)) 1453 ieee80211_parse_csaparams(vap, scan.csa, wh); 1454 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1455 /* 1456 * No CSA ie or 11h disabled, but a channel 1457 * switch is pending; drop out so we aren't 1458 * stuck in CSA state. If the AP really is 1459 * moving we'll get a beacon miss and scan. 1460 */ 1461 IEEE80211_LOCK(ic); 1462 ieee80211_csa_cancelswitch(ic); 1463 IEEE80211_UNLOCK(ic); 1464 } 1465 /* 1466 * If scanning, pass the info to the scan module. 1467 * Otherwise, check if it's the right time to do 1468 * a background scan. Background scanning must 1469 * be enabled and we must not be operating in the 1470 * turbo phase of dynamic turbo mode. Then, 1471 * it's been a while since the last background 1472 * scan and if no data frames have come through 1473 * recently, kick off a scan. Note that this 1474 * is the mechanism by which a background scan 1475 * is started _and_ continued each time we 1476 * return on-channel to receive a beacon from 1477 * our ap. 1478 */ 1479 if (ic->ic_flags & IEEE80211_F_SCAN) { 1480 ieee80211_add_scan(vap, rxchan, 1481 &scan, wh, subtype, rssi, nf); 1482 } else if (contbgscan(vap)) { 1483 ieee80211_bg_scan(vap, 0); 1484 } else if (startbgscan(vap)) { 1485 vap->iv_stats.is_scan_bg++; 1486 #if 0 1487 /* wakeup if we are sleeing */ 1488 ieee80211_set_pwrsave(vap, 0); 1489 #endif 1490 ieee80211_bg_scan(vap, 0); 1491 } 1492 1493 /* 1494 * Put the station to sleep if we haven't seen 1495 * traffic in a while. 1496 */ 1497 IEEE80211_LOCK(ic); 1498 ieee80211_sta_ps_timer_check(vap); 1499 IEEE80211_UNLOCK(ic); 1500 1501 /* 1502 * If we've had a channel width change (eg HT20<->HT40) 1503 * then schedule a delayed driver notification. 1504 */ 1505 if (ht_state_change) 1506 ieee80211_update_chw(ic); 1507 return; 1508 } 1509 /* 1510 * If scanning, just pass information to the scan module. 1511 */ 1512 if (ic->ic_flags & IEEE80211_F_SCAN) { 1513 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1514 /* 1515 * Actively scanning a channel marked passive; 1516 * send a probe request now that we know there 1517 * is 802.11 traffic present. 1518 * 1519 * XXX check if the beacon we recv'd gives 1520 * us what we need and suppress the probe req 1521 */ 1522 ieee80211_probe_curchan(vap, 1); 1523 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1524 } 1525 ieee80211_add_scan(vap, rxchan, &scan, wh, 1526 subtype, rssi, nf); 1527 return; 1528 } 1529 break; 1530 } 1531 1532 case IEEE80211_FC0_SUBTYPE_AUTH: { 1533 uint16_t algo, seq, status; 1534 /* 1535 * auth frame format 1536 * [2] algorithm 1537 * [2] sequence 1538 * [2] status 1539 * [tlv*] challenge 1540 */ 1541 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1542 algo = le16toh(*(uint16_t *)frm); 1543 seq = le16toh(*(uint16_t *)(frm + 2)); 1544 status = le16toh(*(uint16_t *)(frm + 4)); 1545 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1546 "recv auth frame with algorithm %d seq %d", algo, seq); 1547 1548 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1549 IEEE80211_DISCARD(vap, 1550 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1551 wh, "auth", "%s", "TKIP countermeasures enabled"); 1552 vap->iv_stats.is_rx_auth_countermeasures++; 1553 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1554 ieee80211_send_error(ni, wh->i_addr2, 1555 IEEE80211_FC0_SUBTYPE_AUTH, 1556 IEEE80211_REASON_MIC_FAILURE); 1557 } 1558 return; 1559 } 1560 if (algo == IEEE80211_AUTH_ALG_SHARED) 1561 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1562 seq, status); 1563 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1564 sta_auth_open(ni, wh, rssi, nf, seq, status); 1565 else { 1566 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1567 wh, "auth", "unsupported alg %d", algo); 1568 vap->iv_stats.is_rx_auth_unsupported++; 1569 return; 1570 } 1571 break; 1572 } 1573 1574 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1575 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1576 uint16_t capinfo, associd; 1577 uint16_t status; 1578 1579 if (vap->iv_state != IEEE80211_S_ASSOC) { 1580 vap->iv_stats.is_rx_mgtdiscard++; 1581 return; 1582 } 1583 1584 /* 1585 * asresp frame format 1586 * [2] capability information 1587 * [2] status 1588 * [2] association ID 1589 * [tlv] supported rates 1590 * [tlv] extended supported rates 1591 * [tlv] WME 1592 * [tlv] HT capabilities 1593 * [tlv] HT info 1594 */ 1595 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1596 ni = vap->iv_bss; 1597 capinfo = le16toh(*(uint16_t *)frm); 1598 frm += 2; 1599 status = le16toh(*(uint16_t *)frm); 1600 frm += 2; 1601 if (status != 0) { 1602 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1603 wh->i_addr2, "%sassoc failed (reason %d)", 1604 ISREASSOC(subtype) ? "re" : "", status); 1605 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1606 return; 1607 } 1608 associd = le16toh(*(uint16_t *)frm); 1609 frm += 2; 1610 1611 rates = xrates = wme = htcap = htinfo = NULL; 1612 while (efrm - frm > 1) { 1613 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1614 switch (*frm) { 1615 case IEEE80211_ELEMID_RATES: 1616 rates = frm; 1617 break; 1618 case IEEE80211_ELEMID_XRATES: 1619 xrates = frm; 1620 break; 1621 case IEEE80211_ELEMID_HTCAP: 1622 htcap = frm; 1623 break; 1624 case IEEE80211_ELEMID_HTINFO: 1625 htinfo = frm; 1626 break; 1627 case IEEE80211_ELEMID_VENDOR: 1628 if (iswmeoui(frm)) 1629 wme = frm; 1630 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1631 /* 1632 * Accept pre-draft HT ie's if the 1633 * standard ones have not been seen. 1634 */ 1635 if (ishtcapoui(frm)) { 1636 if (htcap == NULL) 1637 htcap = frm; 1638 } else if (ishtinfooui(frm)) { 1639 if (htinfo == NULL) 1640 htinfo = frm; 1641 } 1642 } 1643 /* XXX Atheros OUI support */ 1644 break; 1645 } 1646 frm += frm[1] + 2; 1647 } 1648 1649 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1650 if (xrates != NULL) 1651 IEEE80211_VERIFY_ELEMENT(xrates, 1652 IEEE80211_RATE_MAXSIZE - rates[1], return); 1653 rate = ieee80211_setup_rates(ni, rates, xrates, 1654 IEEE80211_F_JOIN | 1655 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1656 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1657 if (rate & IEEE80211_RATE_BASIC) { 1658 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1659 wh->i_addr2, 1660 "%sassoc failed (rate set mismatch)", 1661 ISREASSOC(subtype) ? "re" : ""); 1662 vap->iv_stats.is_rx_assoc_norate++; 1663 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1664 IEEE80211_SCAN_FAIL_STATUS); 1665 return; 1666 } 1667 1668 ni->ni_capinfo = capinfo; 1669 ni->ni_associd = associd; 1670 if (ni->ni_jointime == 0) 1671 ni->ni_jointime = time_uptime; 1672 if (wme != NULL && 1673 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1674 ni->ni_flags |= IEEE80211_NODE_QOS; 1675 ieee80211_wme_updateparams(vap); 1676 } else 1677 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1678 /* 1679 * Setup HT state according to the negotiation. 1680 * 1681 * NB: shouldn't need to check if HT use is enabled but some 1682 * ap's send back HT ie's even when we don't indicate we 1683 * are HT capable in our AssocReq. 1684 */ 1685 if (htcap != NULL && htinfo != NULL && 1686 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1687 ieee80211_ht_node_init(ni); 1688 ieee80211_ht_updateparams(ni, htcap, htinfo); 1689 ieee80211_setup_htrates(ni, htcap, 1690 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1691 ieee80211_setup_basic_htrates(ni, htinfo); 1692 ieee80211_node_setuptxparms(ni); 1693 ieee80211_ratectl_node_init(ni); 1694 } 1695 1696 /* 1697 * Always initialise FF/superg state; we can use this 1698 * for doing A-MSDU encapsulation as well. 1699 */ 1700 #ifdef IEEE80211_SUPPORT_SUPERG 1701 ieee80211_ff_node_init(ni); 1702 #endif 1703 1704 /* 1705 * Configure state now that we are associated. 1706 * 1707 * XXX may need different/additional driver callbacks? 1708 */ 1709 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1710 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1711 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1712 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1713 } else { 1714 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1715 ic->ic_flags |= IEEE80211_F_USEBARKER; 1716 } 1717 ieee80211_set_shortslottime(ic, 1718 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1719 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1720 /* 1721 * Honor ERP protection. 1722 * 1723 * NB: ni_erp should zero for non-11g operation. 1724 */ 1725 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1726 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1727 ic->ic_flags |= IEEE80211_F_USEPROT; 1728 else 1729 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1730 IEEE80211_NOTE_MAC(vap, 1731 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1732 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1733 ISREASSOC(subtype) ? "re" : "", 1734 IEEE80211_NODE_AID(ni), 1735 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1736 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1737 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1738 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1739 ni->ni_flags & IEEE80211_NODE_HT ? 1740 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1741 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1742 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1743 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1744 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1745 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1746 ", fast-frames" : "", 1747 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1748 ", turbo" : "" 1749 ); 1750 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1751 break; 1752 } 1753 1754 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1755 uint16_t reason; 1756 1757 if (vap->iv_state == IEEE80211_S_SCAN) { 1758 vap->iv_stats.is_rx_mgtdiscard++; 1759 return; 1760 } 1761 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1762 /* NB: can happen when in promiscuous mode */ 1763 vap->iv_stats.is_rx_mgtdiscard++; 1764 break; 1765 } 1766 1767 /* 1768 * deauth frame format 1769 * [2] reason 1770 */ 1771 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1772 reason = le16toh(*(uint16_t *)frm); 1773 1774 vap->iv_stats.is_rx_deauth++; 1775 vap->iv_stats.is_rx_deauth_code = reason; 1776 IEEE80211_NODE_STAT(ni, rx_deauth); 1777 1778 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1779 "recv deauthenticate (reason: %d (%s))", reason, 1780 ieee80211_reason_to_string(reason)); 1781 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1782 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1783 break; 1784 } 1785 1786 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1787 uint16_t reason; 1788 1789 if (vap->iv_state != IEEE80211_S_RUN && 1790 vap->iv_state != IEEE80211_S_ASSOC && 1791 vap->iv_state != IEEE80211_S_AUTH) { 1792 vap->iv_stats.is_rx_mgtdiscard++; 1793 return; 1794 } 1795 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1796 /* NB: can happen when in promiscuous mode */ 1797 vap->iv_stats.is_rx_mgtdiscard++; 1798 break; 1799 } 1800 1801 /* 1802 * disassoc frame format 1803 * [2] reason 1804 */ 1805 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1806 reason = le16toh(*(uint16_t *)frm); 1807 1808 vap->iv_stats.is_rx_disassoc++; 1809 vap->iv_stats.is_rx_disassoc_code = reason; 1810 IEEE80211_NODE_STAT(ni, rx_disassoc); 1811 1812 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1813 "recv disassociate (reason: %d (%s))", reason, 1814 ieee80211_reason_to_string(reason)); 1815 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1816 break; 1817 } 1818 1819 case IEEE80211_FC0_SUBTYPE_ACTION: 1820 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1821 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1822 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1823 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1824 wh, NULL, "%s", "not for us"); 1825 vap->iv_stats.is_rx_mgtdiscard++; 1826 } else if (vap->iv_state != IEEE80211_S_RUN) { 1827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1828 wh, NULL, "wrong state %s", 1829 ieee80211_state_name[vap->iv_state]); 1830 vap->iv_stats.is_rx_mgtdiscard++; 1831 } else { 1832 if (ieee80211_parse_action(ni, m0) == 0) 1833 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1834 } 1835 break; 1836 1837 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1838 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1839 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1840 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1841 case IEEE80211_FC0_SUBTYPE_ATIM: 1842 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1843 wh, NULL, "%s", "not handled"); 1844 vap->iv_stats.is_rx_mgtdiscard++; 1845 break; 1846 1847 default: 1848 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1849 wh, "mgt", "subtype 0x%x not handled", subtype); 1850 vap->iv_stats.is_rx_badsubtype++; 1851 break; 1852 } 1853 #undef ISREASSOC 1854 } 1855 1856 static void 1857 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1858 { 1859 switch (subtype) { 1860 case IEEE80211_FC0_SUBTYPE_BAR: 1861 ieee80211_recv_bar(ni, m); 1862 break; 1863 } 1864 }
Cache object: 5bc0a6a07cec67d12d960a89112f671b
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