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 <netproto/802_11/ieee80211_var.h> 60 #include <netproto/802_11/ieee80211_sta.h> 61 #include <netproto/802_11/ieee80211_input.h> 62 #ifdef IEEE80211_SUPPORT_SUPERG 63 #include <netproto/802_11/ieee80211_superg.h> 64 #endif 65 #include <netproto/802_11/ieee80211_ratectl.h> 66 #include <netproto/802_11/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 *, int, int); 74 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 75 int subtype, int rssi, int nf); 76 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 77 78 void 79 ieee80211_sta_attach(struct ieee80211com *ic) 80 { 81 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 82 } 83 84 void 85 ieee80211_sta_detach(struct ieee80211com *ic) 86 { 87 } 88 89 static void 90 sta_vdetach(struct ieee80211vap *vap) 91 { 92 } 93 94 static void 95 sta_vattach(struct ieee80211vap *vap) 96 { 97 vap->iv_newstate = sta_newstate; 98 vap->iv_input = sta_input; 99 vap->iv_recv_mgmt = sta_recv_mgmt; 100 vap->iv_recv_ctl = sta_recv_ctl; 101 vap->iv_opdetach = sta_vdetach; 102 vap->iv_bmiss = sta_beacon_miss; 103 } 104 105 /* 106 * Handle a beacon miss event. The common code filters out 107 * spurious events that can happen when scanning and/or before 108 * reaching RUN state. 109 */ 110 static void 111 sta_beacon_miss(struct ieee80211vap *vap) 112 { 113 struct ieee80211com *ic = vap->iv_ic; 114 115 IEEE80211_LOCK_ASSERT(ic); 116 117 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 118 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 119 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 120 121 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 122 "beacon miss, mode %s state %s\n", 123 ieee80211_opmode_name[vap->iv_opmode], 124 ieee80211_state_name[vap->iv_state]); 125 126 if (vap->iv_state == IEEE80211_S_CSA) { 127 /* 128 * A Channel Switch is pending; assume we missed the 129 * beacon that would've completed the process and just 130 * force the switch. If we made a mistake we'll not 131 * find the AP on the new channel and fall back to a 132 * normal scan. 133 */ 134 ieee80211_csa_completeswitch(ic); 135 return; 136 } 137 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 138 /* 139 * Send a directed probe req before falling back to a 140 * scan; if we receive a response ic_bmiss_count will 141 * be reset. Some cards mistakenly report beacon miss 142 * so this avoids the expensive scan if the ap is 143 * still there. 144 */ 145 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 146 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 147 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 148 return; 149 } 150 151 callout_stop(&vap->iv_swbmiss); 152 vap->iv_bmiss_count = 0; 153 vap->iv_stats.is_beacon_miss++; 154 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 155 #ifdef IEEE80211_SUPPORT_SUPERG 156 struct ieee80211com *ic = vap->iv_ic; 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 /* 209 * IEEE80211_M_STA vap state machine handler. 210 * This routine handles the main states in the 802.11 protocol. 211 */ 212 static int 213 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 214 { 215 struct ieee80211com *ic = vap->iv_ic; 216 struct ieee80211_node *ni; 217 enum ieee80211_state ostate; 218 219 IEEE80211_LOCK_ASSERT(ic); 220 221 ostate = vap->iv_state; 222 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 223 __func__, ieee80211_state_name[ostate], 224 ieee80211_state_name[nstate], arg); 225 vap->iv_state = nstate; /* state transition */ 226 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 227 if (ostate != IEEE80211_S_SCAN) 228 ieee80211_cancel_scan(vap); /* background scan */ 229 ni = vap->iv_bss; /* NB: no reference held */ 230 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 231 callout_stop(&vap->iv_swbmiss); 232 switch (nstate) { 233 case IEEE80211_S_INIT: 234 switch (ostate) { 235 case IEEE80211_S_SLEEP: 236 /* XXX wakeup */ 237 /* XXX driver hook to wakeup the hardware? */ 238 case IEEE80211_S_RUN: 239 IEEE80211_SEND_MGMT(ni, 240 IEEE80211_FC0_SUBTYPE_DISASSOC, 241 IEEE80211_REASON_ASSOC_LEAVE); 242 ieee80211_sta_leave(ni); 243 break; 244 case IEEE80211_S_ASSOC: 245 IEEE80211_SEND_MGMT(ni, 246 IEEE80211_FC0_SUBTYPE_DEAUTH, 247 IEEE80211_REASON_AUTH_LEAVE); 248 break; 249 case IEEE80211_S_SCAN: 250 ieee80211_cancel_scan(vap); 251 break; 252 default: 253 goto invalid; 254 } 255 if (ostate != IEEE80211_S_INIT) { 256 /* NB: optimize INIT -> INIT case */ 257 ieee80211_reset_bss(vap); 258 } 259 if (vap->iv_auth->ia_detach != NULL) 260 vap->iv_auth->ia_detach(vap); 261 break; 262 case IEEE80211_S_SCAN: 263 switch (ostate) { 264 case IEEE80211_S_INIT: 265 /* 266 * Initiate a scan. We can come here as a result 267 * of an IEEE80211_IOC_SCAN_REQ too in which case 268 * the vap will be marked with IEEE80211_FEXT_SCANREQ 269 * and the scan request parameters will be present 270 * in iv_scanreq. Otherwise we do the default. 271 */ 272 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 273 ieee80211_check_scan(vap, 274 vap->iv_scanreq_flags, 275 vap->iv_scanreq_duration, 276 vap->iv_scanreq_mindwell, 277 vap->iv_scanreq_maxdwell, 278 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 279 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 280 } else 281 ieee80211_check_scan_current(vap); 282 break; 283 case IEEE80211_S_SCAN: 284 case IEEE80211_S_AUTH: 285 case IEEE80211_S_ASSOC: 286 /* 287 * These can happen either because of a timeout 288 * on an assoc/auth response or because of a 289 * change in state that requires a reset. For 290 * the former we're called with a non-zero arg 291 * that is the cause for the failure; pass this 292 * to the scan code so it can update state. 293 * Otherwise trigger a new scan unless we're in 294 * manual roaming mode in which case an application 295 * must issue an explicit scan request. 296 */ 297 if (arg != 0) 298 ieee80211_scan_assoc_fail(vap, 299 vap->iv_bss->ni_macaddr, arg); 300 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 301 ieee80211_check_scan_current(vap); 302 break; 303 case IEEE80211_S_SLEEP: /* beacon miss */ 304 /* 305 * XXX if in sleep we need to wakeup the hardware. 306 */ 307 /* FALLTHROUGH */ 308 case IEEE80211_S_RUN: /* beacon miss */ 309 /* 310 * Beacon miss. Notify user space and if not 311 * under control of a user application (roaming 312 * manual) kick off a scan to re-connect. 313 */ 314 315 ieee80211_sta_leave(ni); 316 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 317 ieee80211_check_scan_current(vap); 318 break; 319 default: 320 goto invalid; 321 } 322 break; 323 case IEEE80211_S_AUTH: 324 switch (ostate) { 325 case IEEE80211_S_INIT: 326 case IEEE80211_S_SCAN: 327 IEEE80211_SEND_MGMT(ni, 328 IEEE80211_FC0_SUBTYPE_AUTH, 1); 329 break; 330 case IEEE80211_S_AUTH: 331 case IEEE80211_S_ASSOC: 332 switch (arg & 0xff) { 333 case IEEE80211_FC0_SUBTYPE_AUTH: 334 /* ??? */ 335 IEEE80211_SEND_MGMT(ni, 336 IEEE80211_FC0_SUBTYPE_AUTH, 2); 337 break; 338 case IEEE80211_FC0_SUBTYPE_DEAUTH: 339 sta_authretry(vap, ni, arg>>8); 340 break; 341 } 342 break; 343 case IEEE80211_S_RUN: 344 switch (arg & 0xff) { 345 case IEEE80211_FC0_SUBTYPE_AUTH: 346 IEEE80211_SEND_MGMT(ni, 347 IEEE80211_FC0_SUBTYPE_AUTH, 2); 348 vap->iv_state = ostate; /* stay RUN */ 349 break; 350 case IEEE80211_FC0_SUBTYPE_DEAUTH: 351 ieee80211_sta_leave(ni); 352 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 353 /* try to reauth */ 354 IEEE80211_SEND_MGMT(ni, 355 IEEE80211_FC0_SUBTYPE_AUTH, 1); 356 } 357 break; 358 } 359 break; 360 default: 361 goto invalid; 362 } 363 break; 364 case IEEE80211_S_ASSOC: 365 switch (ostate) { 366 case IEEE80211_S_AUTH: 367 case IEEE80211_S_ASSOC: 368 IEEE80211_SEND_MGMT(ni, 369 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 370 break; 371 case IEEE80211_S_SLEEP: /* cannot happen */ 372 case IEEE80211_S_RUN: 373 ieee80211_sta_leave(ni); 374 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 375 IEEE80211_SEND_MGMT(ni, arg ? 376 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 377 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 378 } 379 break; 380 default: 381 goto invalid; 382 } 383 break; 384 case IEEE80211_S_RUN: 385 if (vap->iv_flags & IEEE80211_F_WPA) { 386 /* XXX validate prerequisites */ 387 } 388 switch (ostate) { 389 case IEEE80211_S_RUN: 390 case IEEE80211_S_CSA: 391 break; 392 case IEEE80211_S_AUTH: /* when join is done in fw */ 393 case IEEE80211_S_ASSOC: 394 #ifdef IEEE80211_DEBUG 395 if (ieee80211_msg_debug(vap)) { 396 ieee80211_note(vap, "%s with %s ssid ", 397 (vap->iv_opmode == IEEE80211_M_STA ? 398 "associated" : "synchronized"), 399 ether_sprintf(ni->ni_bssid)); 400 ieee80211_print_essid(vap->iv_bss->ni_essid, 401 ni->ni_esslen); 402 /* XXX MCS/HT */ 403 kprintf(" channel %d start %uMb\n", 404 ieee80211_chan2ieee(ic, ic->ic_curchan), 405 IEEE80211_RATE2MBS(ni->ni_txrate)); 406 } 407 #endif 408 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 409 ieee80211_notify_node_join(ni, 410 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 411 break; 412 case IEEE80211_S_SLEEP: 413 /* Wake up from sleep */ 414 vap->iv_sta_ps(vap, 0); 415 break; 416 default: 417 goto invalid; 418 } 419 ieee80211_sync_curchan(ic); 420 if (ostate != IEEE80211_S_RUN && 421 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 422 /* 423 * Start s/w beacon miss timer for devices w/o 424 * hardware support. We fudge a bit here since 425 * we're doing this in software. 426 */ 427 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 428 2 * vap->iv_bmissthreshold * ni->ni_intval); 429 vap->iv_swbmiss_count = 0; 430 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 431 ieee80211_swbmiss, vap); 432 } 433 /* 434 * When 802.1x is not in use mark the port authorized 435 * at this point so traffic can flow. 436 */ 437 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 438 ieee80211_node_authorize(ni); 439 /* 440 * Fake association when joining an existing bss. 441 * 442 * Don't do this if we're doing SLEEP->RUN. 443 */ 444 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 445 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 446 break; 447 case IEEE80211_S_CSA: 448 if (ostate != IEEE80211_S_RUN) 449 goto invalid; 450 break; 451 case IEEE80211_S_SLEEP: 452 vap->iv_sta_ps(vap, 1); 453 break; 454 default: 455 invalid: 456 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 457 "%s: unexpected state transition %s -> %s\n", __func__, 458 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 459 break; 460 } 461 return 0; 462 } 463 464 /* 465 * Return non-zero if the frame is an echo of a multicast 466 * frame sent by ourself. The dir is known to be DSTODS. 467 */ 468 static __inline int 469 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 470 { 471 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 472 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 473 const uint8_t *sa; 474 475 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 476 477 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 478 return 0; 479 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 480 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 481 #undef WH4 482 #undef QWH4 483 } 484 485 /* 486 * Return non-zero if the frame is an echo of a multicast 487 * frame sent by ourself. The dir is known to be FROMDS. 488 */ 489 static __inline int 490 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 491 { 492 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 493 494 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 495 return 0; 496 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 497 } 498 499 /* 500 * Decide if a received management frame should be 501 * printed when debugging is enabled. This filters some 502 * of the less interesting frames that come frequently 503 * (e.g. beacons). 504 */ 505 static __inline int 506 doprint(struct ieee80211vap *vap, int subtype) 507 { 508 switch (subtype) { 509 case IEEE80211_FC0_SUBTYPE_BEACON: 510 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 511 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 512 return 0; 513 } 514 return 1; 515 } 516 517 /* 518 * Process a received frame. The node associated with the sender 519 * should be supplied. If nothing was found in the node table then 520 * the caller is assumed to supply a reference to iv_bss instead. 521 * The RSSI and a timestamp are also supplied. The RSSI data is used 522 * during AP scanning to select a AP to associate with; it can have 523 * any units so long as values have consistent units and higher values 524 * mean ``better signal''. The receive timestamp is currently not used 525 * by the 802.11 layer. 526 */ 527 static int 528 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 529 { 530 #define HAS_SEQ(type) ((type & 0x4) == 0) 531 struct ieee80211vap *vap = ni->ni_vap; 532 struct ieee80211com *ic = ni->ni_ic; 533 struct ifnet *ifp = vap->iv_ifp; 534 struct ieee80211_frame *wh; 535 struct ieee80211_key *key; 536 struct ether_header *eh; 537 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 538 uint8_t dir, type, subtype, qos; 539 uint8_t *bssid; 540 uint16_t rxseq; 541 542 if (m->m_flags & M_AMPDU_MPDU) { 543 /* 544 * Fastpath for A-MPDU reorder q resubmission. Frames 545 * w/ M_AMPDU_MPDU marked have already passed through 546 * here but were received out of order and been held on 547 * the reorder queue. When resubmitted they are marked 548 * with the M_AMPDU_MPDU flag and we can bypass most of 549 * the normal processing. 550 */ 551 wh = mtod(m, struct ieee80211_frame *); 552 type = IEEE80211_FC0_TYPE_DATA; 553 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 554 subtype = IEEE80211_FC0_SUBTYPE_QOS; 555 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 556 goto resubmit_ampdu; 557 } 558 559 KASSERT(ni != NULL, ("null node")); 560 ni->ni_inact = ni->ni_inact_reload; 561 562 type = -1; /* undefined */ 563 564 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 565 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 566 ni->ni_macaddr, NULL, 567 "too short (1): len %u", m->m_pkthdr.len); 568 vap->iv_stats.is_rx_tooshort++; 569 goto out; 570 } 571 /* 572 * Bit of a cheat here, we use a pointer for a 3-address 573 * frame format but don't reference fields past outside 574 * ieee80211_frame_min w/o first validating the data is 575 * present. 576 */ 577 wh = mtod(m, struct ieee80211_frame *); 578 579 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 580 IEEE80211_FC0_VERSION_0) { 581 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 582 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 583 wh->i_fc[0], wh->i_fc[1]); 584 vap->iv_stats.is_rx_badversion++; 585 goto err; 586 } 587 588 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 589 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 590 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 591 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 592 bssid = wh->i_addr2; 593 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 594 /* not interested in */ 595 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 596 bssid, NULL, "%s", "not to bss"); 597 vap->iv_stats.is_rx_wrongbss++; 598 goto out; 599 } 600 601 /* 602 * Some devices may be in a promiscuous mode 603 * where they receive frames for multiple station 604 * addresses. 605 * 606 * If we receive a data frame that isn't 607 * destined to our VAP MAC, drop it. 608 * 609 * XXX TODO: This is only enforced when not scanning; 610 * XXX it assumes a software-driven scan will put the NIC 611 * XXX into a "no data frames" mode before setting this 612 * XXX flag. Otherwise it may be possible that we'll still 613 * XXX process data frames whilst scanning. 614 */ 615 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 616 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 617 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 618 bssid, NULL, "not to cur sta: lladdr=%s, addr1=%s", 619 ether_sprintf(IF_LLADDR(ifp)), 620 ether_sprintf(wh->i_addr1)); 621 vap->iv_stats.is_rx_wrongbss++; 622 goto out; 623 } 624 625 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 626 ni->ni_noise = nf; 627 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 628 uint8_t tid = ieee80211_gettid(wh); 629 if (IEEE80211_QOS_HAS_SEQ(wh) && 630 TID_TO_WME_AC(tid) >= WME_AC_VI) 631 ic->ic_wme.wme_hipri_traffic++; 632 rxseq = le16toh(*(uint16_t *)wh->i_seq); 633 if (! ieee80211_check_rxseq(ni, wh)) { 634 /* duplicate, discard */ 635 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 636 bssid, "duplicate", 637 "seqno <%u,%u> fragno <%u,%u> tid %u", 638 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 639 ni->ni_rxseqs[tid] >> 640 IEEE80211_SEQ_SEQ_SHIFT, 641 rxseq & IEEE80211_SEQ_FRAG_MASK, 642 ni->ni_rxseqs[tid] & 643 IEEE80211_SEQ_FRAG_MASK, 644 tid); 645 vap->iv_stats.is_rx_dup++; 646 IEEE80211_NODE_STAT(ni, rx_dup); 647 goto out; 648 } 649 ni->ni_rxseqs[tid] = rxseq; 650 } 651 } 652 653 switch (type) { 654 case IEEE80211_FC0_TYPE_DATA: 655 hdrspace = ieee80211_hdrspace(ic, wh); 656 if (m->m_len < hdrspace && 657 (m = m_pullup(m, hdrspace)) == NULL) { 658 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 659 ni->ni_macaddr, NULL, 660 "data too short: expecting %u", hdrspace); 661 vap->iv_stats.is_rx_tooshort++; 662 goto out; /* XXX */ 663 } 664 /* 665 * Handle A-MPDU re-ordering. If the frame is to be 666 * processed directly then ieee80211_ampdu_reorder 667 * will return 0; otherwise it has consumed the mbuf 668 * and we should do nothing more with it. 669 */ 670 if ((m->m_flags & M_AMPDU) && 671 (dir == IEEE80211_FC1_DIR_FROMDS || 672 dir == IEEE80211_FC1_DIR_DSTODS) && 673 ieee80211_ampdu_reorder(ni, m) != 0) { 674 m = NULL; 675 goto out; 676 } 677 resubmit_ampdu: 678 if (dir == IEEE80211_FC1_DIR_FROMDS) { 679 if ((ifp->if_flags & IFF_SIMPLEX) && 680 isfromds_mcastecho(vap, wh)) { 681 /* 682 * In IEEE802.11 network, multicast 683 * packets sent from "me" are broadcast 684 * from the AP; silently discard for 685 * SIMPLEX interface. 686 */ 687 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 688 wh, "data", "%s", "multicast echo"); 689 vap->iv_stats.is_rx_mcastecho++; 690 goto out; 691 } 692 if ((vap->iv_flags & IEEE80211_F_DWDS) && 693 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 694 /* 695 * DWDS sta's must drop 3-address mcast frames 696 * as they will be sent separately as a 4-addr 697 * frame. Accepting the 3-addr frame will 698 * confuse the bridge into thinking the sending 699 * sta is located at the end of WDS link. 700 */ 701 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 702 "3-address data", "%s", "DWDS enabled"); 703 vap->iv_stats.is_rx_mcastecho++; 704 goto out; 705 } 706 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 707 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 708 IEEE80211_DISCARD(vap, 709 IEEE80211_MSG_INPUT, wh, "4-address data", 710 "%s", "DWDS not enabled"); 711 vap->iv_stats.is_rx_wrongdir++; 712 goto out; 713 } 714 if ((ifp->if_flags & IFF_SIMPLEX) && 715 isdstods_mcastecho(vap, wh)) { 716 /* 717 * In IEEE802.11 network, multicast 718 * packets sent from "me" are broadcast 719 * from the AP; silently discard for 720 * SIMPLEX interface. 721 */ 722 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 723 "4-address data", "%s", "multicast echo"); 724 vap->iv_stats.is_rx_mcastecho++; 725 goto out; 726 } 727 } else { 728 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 729 "data", "incorrect dir 0x%x", dir); 730 vap->iv_stats.is_rx_wrongdir++; 731 goto out; 732 } 733 734 /* 735 * Handle privacy requirements. Note that we 736 * must not be preempted from here until after 737 * we (potentially) call ieee80211_crypto_demic; 738 * otherwise we may violate assumptions in the 739 * crypto cipher modules used to do delayed update 740 * of replay sequence numbers. 741 */ 742 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 743 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 744 /* 745 * Discard encrypted frames when privacy is off. 746 */ 747 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 748 wh, "WEP", "%s", "PRIVACY off"); 749 vap->iv_stats.is_rx_noprivacy++; 750 IEEE80211_NODE_STAT(ni, rx_noprivacy); 751 goto out; 752 } 753 key = ieee80211_crypto_decap(ni, m, hdrspace); 754 if (key == NULL) { 755 /* NB: stats+msgs handled in crypto_decap */ 756 IEEE80211_NODE_STAT(ni, rx_wepfail); 757 goto out; 758 } 759 wh = mtod(m, struct ieee80211_frame *); 760 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 761 } else { 762 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 763 key = NULL; 764 } 765 766 /* 767 * Save QoS bits for use below--before we strip the header. 768 */ 769 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 770 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 771 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 772 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 773 } else 774 qos = 0; 775 776 /* 777 * Next up, any fragmentation. 778 */ 779 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 780 m = ieee80211_defrag(ni, m, hdrspace); 781 if (m == NULL) { 782 /* Fragment dropped or frame not complete yet */ 783 goto out; 784 } 785 } 786 wh = NULL; /* no longer valid, catch any uses */ 787 788 /* 789 * Next strip any MSDU crypto bits. 790 */ 791 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 792 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 793 ni->ni_macaddr, "data", "%s", "demic error"); 794 vap->iv_stats.is_rx_demicfail++; 795 IEEE80211_NODE_STAT(ni, rx_demicfail); 796 goto out; 797 } 798 799 /* copy to listener after decrypt */ 800 if (ieee80211_radiotap_active_vap(vap)) 801 ieee80211_radiotap_rx(vap, m); 802 need_tap = 0; 803 804 /* 805 * Finally, strip the 802.11 header. 806 */ 807 m = ieee80211_decap(vap, m, hdrspace); 808 if (m == NULL) { 809 /* XXX mask bit to check for both */ 810 /* don't count Null data frames as errors */ 811 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 812 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 813 goto out; 814 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 815 ni->ni_macaddr, "data", "%s", "decap error"); 816 vap->iv_stats.is_rx_decap++; 817 IEEE80211_NODE_STAT(ni, rx_decap); 818 goto err; 819 } 820 eh = mtod(m, struct ether_header *); 821 if (!ieee80211_node_is_authorized(ni)) { 822 /* 823 * Deny any non-PAE frames received prior to 824 * authorization. For open/shared-key 825 * authentication the port is mark authorized 826 * after authentication completes. For 802.1x 827 * the port is not marked authorized by the 828 * authenticator until the handshake has completed. 829 */ 830 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 831 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 832 eh->ether_shost, "data", 833 "unauthorized port: ether type 0x%x len %u", 834 eh->ether_type, m->m_pkthdr.len); 835 vap->iv_stats.is_rx_unauth++; 836 IEEE80211_NODE_STAT(ni, rx_unauth); 837 goto err; 838 } 839 } else { 840 /* 841 * When denying unencrypted frames, discard 842 * any non-PAE frames received without encryption. 843 */ 844 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 845 (key == NULL && (m->m_flags & M_WEP) == 0) && 846 eh->ether_type != htons(ETHERTYPE_PAE)) { 847 /* 848 * Drop unencrypted frames. 849 */ 850 vap->iv_stats.is_rx_unencrypted++; 851 IEEE80211_NODE_STAT(ni, rx_unencrypted); 852 goto out; 853 } 854 } 855 /* XXX require HT? */ 856 if (qos & IEEE80211_QOS_AMSDU) { 857 m = ieee80211_decap_amsdu(ni, m); 858 if (m == NULL) 859 return IEEE80211_FC0_TYPE_DATA; 860 } else { 861 #ifdef IEEE80211_SUPPORT_SUPERG 862 m = ieee80211_decap_fastframe(vap, ni, m); 863 if (m == NULL) 864 return IEEE80211_FC0_TYPE_DATA; 865 #endif 866 } 867 ieee80211_deliver_data(vap, ni, m); 868 return IEEE80211_FC0_TYPE_DATA; 869 870 case IEEE80211_FC0_TYPE_MGT: 871 vap->iv_stats.is_rx_mgmt++; 872 IEEE80211_NODE_STAT(ni, rx_mgmt); 873 if (dir != IEEE80211_FC1_DIR_NODS) { 874 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 875 wh, "data", "incorrect dir 0x%x", dir); 876 vap->iv_stats.is_rx_wrongdir++; 877 goto err; 878 } 879 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 880 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 881 ni->ni_macaddr, "mgt", "too short: len %u", 882 m->m_pkthdr.len); 883 vap->iv_stats.is_rx_tooshort++; 884 goto out; 885 } 886 #ifdef IEEE80211_DEBUG 887 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 888 ieee80211_msg_dumppkts(vap)) { 889 if_printf(ifp, "received %s from %s rssi %d\n", 890 ieee80211_mgt_subtype_name[subtype >> 891 IEEE80211_FC0_SUBTYPE_SHIFT], 892 ether_sprintf(wh->i_addr2), rssi); 893 } 894 #endif 895 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 896 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 897 /* 898 * Only shared key auth frames with a challenge 899 * should be encrypted, discard all others. 900 */ 901 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 902 wh, ieee80211_mgt_subtype_name[subtype >> 903 IEEE80211_FC0_SUBTYPE_SHIFT], 904 "%s", "WEP set but not permitted"); 905 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 906 goto out; 907 } 908 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 909 /* 910 * Discard encrypted frames when privacy is off. 911 */ 912 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 913 wh, "mgt", "%s", "WEP set but PRIVACY off"); 914 vap->iv_stats.is_rx_noprivacy++; 915 goto out; 916 } 917 hdrspace = ieee80211_hdrspace(ic, wh); 918 key = ieee80211_crypto_decap(ni, m, hdrspace); 919 if (key == NULL) { 920 /* NB: stats+msgs handled in crypto_decap */ 921 goto out; 922 } 923 wh = mtod(m, struct ieee80211_frame *); 924 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 925 } 926 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 927 goto out; 928 929 case IEEE80211_FC0_TYPE_CTL: 930 vap->iv_stats.is_rx_ctl++; 931 IEEE80211_NODE_STAT(ni, rx_ctrl); 932 vap->iv_recv_ctl(ni, m, subtype); 933 goto out; 934 935 default: 936 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 937 wh, NULL, "bad frame type 0x%x", type); 938 /* should not come here */ 939 break; 940 } 941 err: 942 IFNET_STAT_INC(ifp, ierrors, 1); 943 out: 944 if (m != NULL) { 945 if (need_tap && ieee80211_radiotap_active_vap(vap)) 946 ieee80211_radiotap_rx(vap, m); 947 m_freem(m); 948 } 949 return type; 950 } 951 952 static void 953 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 954 int rssi, int nf, uint16_t seq, uint16_t status) 955 { 956 struct ieee80211vap *vap = ni->ni_vap; 957 958 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 960 ni->ni_macaddr, "open auth", 961 "bad sta auth mode %u", ni->ni_authmode); 962 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 963 return; 964 } 965 if (vap->iv_state != IEEE80211_S_AUTH || 966 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 967 vap->iv_stats.is_rx_bad_auth++; 968 return; 969 } 970 if (status != 0) { 971 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 972 ni, "open auth failed (reason %d)", status); 973 vap->iv_stats.is_rx_auth_fail++; 974 vap->iv_stats.is_rx_authfail_code = status; 975 ieee80211_new_state(vap, IEEE80211_S_SCAN, 976 IEEE80211_SCAN_FAIL_STATUS); 977 } else 978 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 979 } 980 981 static void 982 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 983 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 984 uint16_t seq, uint16_t status) 985 { 986 struct ieee80211vap *vap = ni->ni_vap; 987 uint8_t *challenge; 988 int estatus; 989 990 /* 991 * NB: this can happen as we allow pre-shared key 992 * authentication to be enabled w/o wep being turned 993 * on so that configuration of these can be done 994 * in any order. It may be better to enforce the 995 * ordering in which case this check would just be 996 * for sanity/consistency. 997 */ 998 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 999 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1000 ni->ni_macaddr, "shared key auth", 1001 "%s", " PRIVACY is disabled"); 1002 estatus = IEEE80211_STATUS_ALG; 1003 goto bad; 1004 } 1005 /* 1006 * Pre-shared key authentication is evil; accept 1007 * it only if explicitly configured (it is supported 1008 * mainly for compatibility with clients like OS X). 1009 */ 1010 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1011 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1012 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1013 ni->ni_macaddr, "shared key auth", 1014 "bad sta auth mode %u", ni->ni_authmode); 1015 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1016 estatus = IEEE80211_STATUS_ALG; 1017 goto bad; 1018 } 1019 1020 challenge = NULL; 1021 if (frm + 1 < efrm) { 1022 if ((frm[1] + 2) > (efrm - frm)) { 1023 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1024 ni->ni_macaddr, "shared key auth", 1025 "ie %d/%ld too long", 1026 frm[0], (frm[1] + 2) - (efrm - frm)); 1027 vap->iv_stats.is_rx_bad_auth++; 1028 estatus = IEEE80211_STATUS_CHALLENGE; 1029 goto bad; 1030 } 1031 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1032 challenge = frm; 1033 frm += frm[1] + 2; 1034 } 1035 switch (seq) { 1036 case IEEE80211_AUTH_SHARED_CHALLENGE: 1037 case IEEE80211_AUTH_SHARED_RESPONSE: 1038 if (challenge == NULL) { 1039 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1040 ni->ni_macaddr, "shared key auth", 1041 "%s", "no challenge"); 1042 vap->iv_stats.is_rx_bad_auth++; 1043 estatus = IEEE80211_STATUS_CHALLENGE; 1044 goto bad; 1045 } 1046 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1047 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1048 ni->ni_macaddr, "shared key auth", 1049 "bad challenge len %d", challenge[1]); 1050 vap->iv_stats.is_rx_bad_auth++; 1051 estatus = IEEE80211_STATUS_CHALLENGE; 1052 goto bad; 1053 } 1054 default: 1055 break; 1056 } 1057 if (vap->iv_state != IEEE80211_S_AUTH) 1058 return; 1059 switch (seq) { 1060 case IEEE80211_AUTH_SHARED_PASS: 1061 if (ni->ni_challenge != NULL) { 1062 kfree(ni->ni_challenge, M_80211_NODE); 1063 ni->ni_challenge = NULL; 1064 } 1065 if (status != 0) { 1066 IEEE80211_NOTE_FRAME(vap, 1067 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1068 "shared key auth failed (reason %d)", status); 1069 vap->iv_stats.is_rx_auth_fail++; 1070 vap->iv_stats.is_rx_authfail_code = status; 1071 return; 1072 } 1073 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1074 break; 1075 case IEEE80211_AUTH_SHARED_CHALLENGE: 1076 if (!ieee80211_alloc_challenge(ni)) 1077 return; 1078 /* XXX could optimize by passing recvd challenge */ 1079 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1080 IEEE80211_SEND_MGMT(ni, 1081 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1082 break; 1083 default: 1084 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1085 wh, "shared key auth", "bad seq %d", seq); 1086 vap->iv_stats.is_rx_bad_auth++; 1087 return; 1088 } 1089 return; 1090 bad: 1091 /* 1092 * Kick the state machine. This short-circuits 1093 * using the mgt frame timeout to trigger the 1094 * state transition. 1095 */ 1096 if (vap->iv_state == IEEE80211_S_AUTH) 1097 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1098 IEEE80211_SCAN_FAIL_STATUS); 1099 } 1100 1101 int 1102 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1103 const struct ieee80211_frame *wh) 1104 { 1105 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1106 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1107 u_int len = frm[1], qosinfo; 1108 int i; 1109 1110 if (len < sizeof(struct ieee80211_wme_param)-2) { 1111 IEEE80211_DISCARD_IE(vap, 1112 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1113 wh, "WME", "too short, len %u", len); 1114 return -1; 1115 } 1116 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1117 qosinfo &= WME_QOSINFO_COUNT; 1118 /* XXX do proper check for wraparound */ 1119 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1120 return 0; 1121 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1122 for (i = 0; i < WME_NUM_AC; i++) { 1123 struct wmeParams *wmep = 1124 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1125 /* NB: ACI not used */ 1126 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1127 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1128 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1129 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1130 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1131 frm += 4; 1132 } 1133 wme->wme_wmeChanParams.cap_info = qosinfo; 1134 return 1; 1135 #undef MS 1136 } 1137 1138 /* 1139 * Process 11h Channel Switch Announcement (CSA) ie. If this 1140 * is the first CSA then initiate the switch. Otherwise we 1141 * track state and trigger completion and/or cancel of the switch. 1142 * XXX should be public for IBSS use 1143 */ 1144 static void 1145 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1146 const struct ieee80211_frame *wh) 1147 { 1148 struct ieee80211com *ic = vap->iv_ic; 1149 const struct ieee80211_csa_ie *csa = 1150 (const struct ieee80211_csa_ie *) frm; 1151 1152 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1153 ("state %s", ieee80211_state_name[vap->iv_state])); 1154 1155 if (csa->csa_mode > 1) { 1156 IEEE80211_DISCARD_IE(vap, 1157 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1158 wh, "CSA", "invalid mode %u", csa->csa_mode); 1159 return; 1160 } 1161 IEEE80211_LOCK(ic); 1162 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1163 /* 1164 * Convert the channel number to a channel reference. We 1165 * try first to preserve turbo attribute of the current 1166 * channel then fallback. Note this will not work if the 1167 * CSA specifies a channel that requires a band switch (e.g. 1168 * 11a => 11g). This is intentional as 11h is defined only 1169 * for 5GHz/11a and because the switch does not involve a 1170 * reassociation, protocol state (capabilities, negotated 1171 * rates, etc) may/will be wrong. 1172 */ 1173 struct ieee80211_channel *c = 1174 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1175 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1176 if (c == NULL) { 1177 c = ieee80211_find_channel_byieee(ic, 1178 csa->csa_newchan, 1179 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1180 if (c == NULL) { 1181 IEEE80211_DISCARD_IE(vap, 1182 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1183 wh, "CSA", "invalid channel %u", 1184 csa->csa_newchan); 1185 goto done; 1186 } 1187 } 1188 #if IEEE80211_CSA_COUNT_MIN > 0 1189 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1190 /* 1191 * Require at least IEEE80211_CSA_COUNT_MIN count to 1192 * reduce the risk of being redirected by a fabricated 1193 * CSA. If a valid CSA is dropped we'll still get a 1194 * beacon miss when the AP leaves the channel so we'll 1195 * eventually follow to the new channel. 1196 * 1197 * NOTE: this violates the 11h spec that states that 1198 * count may be any value and if 0 then a switch 1199 * should happen asap. 1200 */ 1201 IEEE80211_DISCARD_IE(vap, 1202 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1203 wh, "CSA", "count %u too small, must be >= %u", 1204 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1205 goto done; 1206 } 1207 #endif 1208 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1209 } else { 1210 /* 1211 * Validate this ie against the initial CSA. We require 1212 * mode and channel not change and the count must be 1213 * monotonically decreasing. This may be pointless and 1214 * canceling the switch as a result may be too paranoid but 1215 * in the worst case if we drop out of CSA because of this 1216 * and the AP does move then we'll just end up taking a 1217 * beacon miss and scan to find the AP. 1218 * 1219 * XXX may want <= on count as we also process ProbeResp 1220 * frames and those may come in w/ the same count as the 1221 * previous beacon; but doing so leaves us open to a stuck 1222 * count until we add a dead-man timer 1223 */ 1224 if (!(csa->csa_count < ic->ic_csa_count && 1225 csa->csa_mode == ic->ic_csa_mode && 1226 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1227 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1228 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1229 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1230 ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count, 1231 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1232 ieee80211_csa_cancelswitch(ic); 1233 } else { 1234 if (csa->csa_count <= 1) 1235 ieee80211_csa_completeswitch(ic); 1236 else 1237 ic->ic_csa_count = csa->csa_count; 1238 } 1239 } 1240 done: 1241 IEEE80211_UNLOCK(ic); 1242 } 1243 1244 /* 1245 * Return non-zero if a background scan may be continued: 1246 * o bg scan is active 1247 * o no channel switch is pending 1248 * o there has not been any traffic recently 1249 * 1250 * Note we do not check if there is an administrative enable; 1251 * this is only done to start the scan. We assume that any 1252 * change in state will be accompanied by a request to cancel 1253 * active scans which will otherwise cause this test to fail. 1254 */ 1255 static __inline int 1256 contbgscan(struct ieee80211vap *vap) 1257 { 1258 struct ieee80211com *ic = vap->iv_ic; 1259 1260 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1261 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1262 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1263 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1264 } 1265 1266 /* 1267 * Return non-zero if a backgrond scan may be started: 1268 * o bg scanning is administratively enabled 1269 * o no channel switch is pending 1270 * o we are not boosted on a dynamic turbo channel 1271 * o there has not been a scan recently 1272 * o there has not been any traffic recently 1273 */ 1274 static __inline int 1275 startbgscan(struct ieee80211vap *vap) 1276 { 1277 struct ieee80211com *ic = vap->iv_ic; 1278 1279 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1280 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1281 #ifdef IEEE80211_SUPPORT_SUPERG 1282 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1283 #endif 1284 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1285 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1286 } 1287 1288 static void 1289 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1290 int subtype, int rssi, int nf) 1291 { 1292 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1293 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1294 struct ieee80211vap *vap = ni->ni_vap; 1295 struct ieee80211com *ic = ni->ni_ic; 1296 struct ieee80211_frame *wh; 1297 uint8_t *frm, *efrm; 1298 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1299 uint8_t rate; 1300 int ht_state_change = 0; 1301 1302 wh = mtod(m0, struct ieee80211_frame *); 1303 frm = (uint8_t *)&wh[1]; 1304 efrm = mtod(m0, uint8_t *) + m0->m_len; 1305 switch (subtype) { 1306 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1307 case IEEE80211_FC0_SUBTYPE_BEACON: { 1308 struct ieee80211_scanparams scan; 1309 /* 1310 * We process beacon/probe response frames: 1311 * o when scanning, or 1312 * o station mode when associated (to collect state 1313 * updates such as 802.11g slot time) 1314 * Frames otherwise received are discarded. 1315 */ 1316 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1317 vap->iv_stats.is_rx_mgtdiscard++; 1318 return; 1319 } 1320 /* XXX probe response in sta mode when !scanning? */ 1321 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) { 1322 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1323 vap->iv_stats.is_beacon_bad++; 1324 return; 1325 } 1326 1327 /* 1328 * Count frame now that we know it's to be processed. 1329 */ 1330 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1331 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1332 IEEE80211_NODE_STAT(ni, rx_beacons); 1333 } else 1334 IEEE80211_NODE_STAT(ni, rx_proberesp); 1335 /* 1336 * When operating in station mode, check for state updates. 1337 * Be careful to ignore beacons received while doing a 1338 * background scan. We consider only 11g/WMM stuff right now. 1339 */ 1340 if (ni->ni_associd != 0 && 1341 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1342 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1343 /* record tsf of last beacon */ 1344 memcpy(ni->ni_tstamp.data, scan.tstamp, 1345 sizeof(ni->ni_tstamp)); 1346 /* count beacon frame for s/w bmiss handling */ 1347 vap->iv_swbmiss_count++; 1348 vap->iv_bmiss_count = 0; 1349 if (ni->ni_erp != scan.erp) { 1350 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1351 wh->i_addr2, 1352 "erp change: was 0x%x, now 0x%x", 1353 ni->ni_erp, scan.erp); 1354 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1355 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1356 ic->ic_flags |= IEEE80211_F_USEPROT; 1357 else 1358 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1359 ni->ni_erp = scan.erp; 1360 /* XXX statistic */ 1361 /* XXX driver notification */ 1362 } 1363 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1364 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1365 wh->i_addr2, 1366 "capabilities change: was 0x%x, now 0x%x", 1367 ni->ni_capinfo, scan.capinfo); 1368 /* 1369 * NB: we assume short preamble doesn't 1370 * change dynamically 1371 */ 1372 ieee80211_set_shortslottime(ic, 1373 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1374 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1375 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1376 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1377 /* XXX statistic */ 1378 } 1379 if (scan.wme != NULL && 1380 (ni->ni_flags & IEEE80211_NODE_QOS) && 1381 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1382 ieee80211_wme_updateparams(vap); 1383 #ifdef IEEE80211_SUPPORT_SUPERG 1384 if (scan.ath != NULL) 1385 ieee80211_parse_athparams(ni, scan.ath, wh); 1386 #endif 1387 if (scan.htcap != NULL && scan.htinfo != NULL && 1388 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1389 /* XXX state changes? */ 1390 if (ieee80211_ht_updateparams(ni, 1391 scan.htcap, scan.htinfo)) 1392 ht_state_change = 1; 1393 } 1394 if (scan.quiet) 1395 ic->ic_set_quiet(ni, scan.quiet); 1396 1397 if (scan.tim != NULL) { 1398 struct ieee80211_tim_ie *tim = 1399 (struct ieee80211_tim_ie *) scan.tim; 1400 /* 1401 * XXX Check/debug this code; see if it's about 1402 * the right time to force the VAP awake if we 1403 * receive a frame destined for us? 1404 */ 1405 int aid = IEEE80211_AID(ni->ni_associd); 1406 int ix = aid / NBBY; 1407 int min = tim->tim_bitctl &~ 1; 1408 int max = tim->tim_len + min - 4; 1409 1410 /* 1411 * Only do this for unicast traffic in the TIM 1412 * The multicast traffic notification for 1413 * the scan notification stuff should occur 1414 * differently. 1415 */ 1416 if (min <= ix && ix <= max && 1417 isset(tim->tim_bitmap - min, aid)) { 1418 ieee80211_sta_tim_notify(vap, 1); 1419 ic->ic_lastdata = ticks; 1420 } 1421 1422 /* 1423 * XXX TODO: do a separate notification 1424 * for the multicast bit being set. 1425 */ 1426 #if 0 1427 if (tim->tim_bitctl & 1) { 1428 ieee80211_sta_tim_notify(vap, 1); 1429 ic->ic_lastdata = ticks; 1430 } 1431 #endif 1432 1433 ni->ni_dtim_count = tim->tim_count; 1434 ni->ni_dtim_period = tim->tim_period; 1435 } 1436 if (scan.csa != NULL && 1437 (vap->iv_flags & IEEE80211_F_DOTH)) 1438 ieee80211_parse_csaparams(vap, scan.csa, wh); 1439 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1440 /* 1441 * No CSA ie or 11h disabled, but a channel 1442 * switch is pending; drop out so we aren't 1443 * stuck in CSA state. If the AP really is 1444 * moving we'll get a beacon miss and scan. 1445 */ 1446 IEEE80211_LOCK(ic); 1447 ieee80211_csa_cancelswitch(ic); 1448 IEEE80211_UNLOCK(ic); 1449 } 1450 /* 1451 * If scanning, pass the info to the scan module. 1452 * Otherwise, check if it's the right time to do 1453 * a background scan. Background scanning must 1454 * be enabled and we must not be operating in the 1455 * turbo phase of dynamic turbo mode. Then, 1456 * it's been a while since the last background 1457 * scan and if no data frames have come through 1458 * recently, kick off a scan. Note that this 1459 * is the mechanism by which a background scan 1460 * is started _and_ continued each time we 1461 * return on-channel to receive a beacon from 1462 * our ap. 1463 */ 1464 if (ic->ic_flags & IEEE80211_F_SCAN) { 1465 ieee80211_add_scan(vap, &scan, wh, 1466 subtype, rssi, nf); 1467 } else if (contbgscan(vap)) { 1468 ieee80211_bg_scan(vap, 0); 1469 } else if (startbgscan(vap)) { 1470 vap->iv_stats.is_scan_bg++; 1471 #if 0 1472 /* wakeup if we are sleeing */ 1473 ieee80211_set_pwrsave(vap, 0); 1474 #endif 1475 ieee80211_bg_scan(vap, 0); 1476 } 1477 1478 /* 1479 * Put the station to sleep if we haven't seen 1480 * traffic in a while. 1481 */ 1482 IEEE80211_LOCK(ic); 1483 ieee80211_sta_ps_timer_check(vap); 1484 IEEE80211_UNLOCK(ic); 1485 1486 /* 1487 * If we've had a channel width change (eg HT20<->HT40) 1488 * then schedule a delayed driver notification. 1489 */ 1490 if (ht_state_change) 1491 ieee80211_update_chw(ic); 1492 return; 1493 } 1494 /* 1495 * If scanning, just pass information to the scan module. 1496 */ 1497 if (ic->ic_flags & IEEE80211_F_SCAN) { 1498 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1499 /* 1500 * Actively scanning a channel marked passive; 1501 * send a probe request now that we know there 1502 * is 802.11 traffic present. 1503 * 1504 * XXX check if the beacon we recv'd gives 1505 * us what we need and suppress the probe req 1506 */ 1507 ieee80211_probe_curchan(vap, 1); 1508 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1509 } 1510 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1511 return; 1512 } 1513 break; 1514 } 1515 1516 case IEEE80211_FC0_SUBTYPE_AUTH: { 1517 uint16_t algo, seq, status; 1518 /* 1519 * auth frame format 1520 * [2] algorithm 1521 * [2] sequence 1522 * [2] status 1523 * [tlv*] challenge 1524 */ 1525 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1526 algo = le16toh(*(uint16_t *)frm); 1527 seq = le16toh(*(uint16_t *)(frm + 2)); 1528 status = le16toh(*(uint16_t *)(frm + 4)); 1529 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1530 "recv auth frame with algorithm %d seq %d", algo, seq); 1531 1532 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1533 IEEE80211_DISCARD(vap, 1534 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1535 wh, "auth", "%s", "TKIP countermeasures enabled"); 1536 vap->iv_stats.is_rx_auth_countermeasures++; 1537 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1538 ieee80211_send_error(ni, wh->i_addr2, 1539 IEEE80211_FC0_SUBTYPE_AUTH, 1540 IEEE80211_REASON_MIC_FAILURE); 1541 } 1542 return; 1543 } 1544 if (algo == IEEE80211_AUTH_ALG_SHARED) 1545 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1546 seq, status); 1547 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1548 sta_auth_open(ni, wh, rssi, nf, seq, status); 1549 else { 1550 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1551 wh, "auth", "unsupported alg %d", algo); 1552 vap->iv_stats.is_rx_auth_unsupported++; 1553 return; 1554 } 1555 break; 1556 } 1557 1558 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1559 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1560 uint16_t capinfo, associd; 1561 uint16_t status; 1562 1563 if (vap->iv_state != IEEE80211_S_ASSOC) { 1564 vap->iv_stats.is_rx_mgtdiscard++; 1565 return; 1566 } 1567 1568 /* 1569 * asresp frame format 1570 * [2] capability information 1571 * [2] status 1572 * [2] association ID 1573 * [tlv] supported rates 1574 * [tlv] extended supported rates 1575 * [tlv] WME 1576 * [tlv] HT capabilities 1577 * [tlv] HT info 1578 */ 1579 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1580 ni = vap->iv_bss; 1581 capinfo = le16toh(*(uint16_t *)frm); 1582 frm += 2; 1583 status = le16toh(*(uint16_t *)frm); 1584 frm += 2; 1585 if (status != 0) { 1586 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1587 wh->i_addr2, "%sassoc failed (reason %d)", 1588 ISREASSOC(subtype) ? "re" : "", status); 1589 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1590 return; 1591 } 1592 associd = le16toh(*(uint16_t *)frm); 1593 frm += 2; 1594 1595 rates = xrates = wme = htcap = htinfo = NULL; 1596 while (efrm - frm > 1) { 1597 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1598 switch (*frm) { 1599 case IEEE80211_ELEMID_RATES: 1600 rates = frm; 1601 break; 1602 case IEEE80211_ELEMID_XRATES: 1603 xrates = frm; 1604 break; 1605 case IEEE80211_ELEMID_HTCAP: 1606 htcap = frm; 1607 break; 1608 case IEEE80211_ELEMID_HTINFO: 1609 htinfo = frm; 1610 break; 1611 case IEEE80211_ELEMID_VENDOR: 1612 if (iswmeoui(frm)) 1613 wme = frm; 1614 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1615 /* 1616 * Accept pre-draft HT ie's if the 1617 * standard ones have not been seen. 1618 */ 1619 if (ishtcapoui(frm)) { 1620 if (htcap == NULL) 1621 htcap = frm; 1622 } else if (ishtinfooui(frm)) { 1623 if (htinfo == NULL) 1624 htinfo = frm; 1625 } 1626 } 1627 /* XXX Atheros OUI support */ 1628 break; 1629 } 1630 frm += frm[1] + 2; 1631 } 1632 1633 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1634 if (xrates != NULL) 1635 IEEE80211_VERIFY_ELEMENT(xrates, 1636 IEEE80211_RATE_MAXSIZE - rates[1], return); 1637 rate = ieee80211_setup_rates(ni, rates, xrates, 1638 IEEE80211_F_JOIN | 1639 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1640 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1641 if (rate & IEEE80211_RATE_BASIC) { 1642 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1643 wh->i_addr2, 1644 "%sassoc failed (rate set mismatch)", 1645 ISREASSOC(subtype) ? "re" : ""); 1646 vap->iv_stats.is_rx_assoc_norate++; 1647 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1648 IEEE80211_SCAN_FAIL_STATUS); 1649 return; 1650 } 1651 1652 ni->ni_capinfo = capinfo; 1653 ni->ni_associd = associd; 1654 if (ni->ni_jointime == 0) 1655 ni->ni_jointime = time_uptime; 1656 if (wme != NULL && 1657 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1658 ni->ni_flags |= IEEE80211_NODE_QOS; 1659 ieee80211_wme_updateparams(vap); 1660 } else 1661 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1662 /* 1663 * Setup HT state according to the negotiation. 1664 * 1665 * NB: shouldn't need to check if HT use is enabled but some 1666 * ap's send back HT ie's even when we don't indicate we 1667 * are HT capable in our AssocReq. 1668 */ 1669 if (htcap != NULL && htinfo != NULL && 1670 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1671 ieee80211_ht_node_init(ni); 1672 ieee80211_ht_updateparams(ni, htcap, htinfo); 1673 ieee80211_setup_htrates(ni, htcap, 1674 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1675 ieee80211_setup_basic_htrates(ni, htinfo); 1676 ieee80211_node_setuptxparms(ni); 1677 ieee80211_ratectl_node_init(ni); 1678 } else { 1679 #ifdef IEEE80211_SUPPORT_SUPERG 1680 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1681 ieee80211_ff_node_init(ni); 1682 #endif 1683 } 1684 /* 1685 * Configure state now that we are associated. 1686 * 1687 * XXX may need different/additional driver callbacks? 1688 */ 1689 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1690 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1691 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1692 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1693 } else { 1694 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1695 ic->ic_flags |= IEEE80211_F_USEBARKER; 1696 } 1697 ieee80211_set_shortslottime(ic, 1698 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1699 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1700 /* 1701 * Honor ERP protection. 1702 * 1703 * NB: ni_erp should zero for non-11g operation. 1704 */ 1705 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1706 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1707 ic->ic_flags |= IEEE80211_F_USEPROT; 1708 else 1709 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1710 IEEE80211_NOTE_MAC(vap, 1711 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1712 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1713 ISREASSOC(subtype) ? "re" : "", 1714 IEEE80211_NODE_AID(ni), 1715 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1716 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1717 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1718 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1719 ni->ni_flags & IEEE80211_NODE_HT ? 1720 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1721 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1722 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1723 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1724 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1725 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1726 ", fast-frames" : "", 1727 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1728 ", turbo" : "" 1729 ); 1730 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1731 break; 1732 } 1733 1734 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1735 uint16_t reason; 1736 1737 if (vap->iv_state == IEEE80211_S_SCAN) { 1738 vap->iv_stats.is_rx_mgtdiscard++; 1739 return; 1740 } 1741 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1742 /* NB: can happen when in promiscuous mode */ 1743 vap->iv_stats.is_rx_mgtdiscard++; 1744 break; 1745 } 1746 1747 /* 1748 * deauth frame format 1749 * [2] reason 1750 */ 1751 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1752 reason = le16toh(*(uint16_t *)frm); 1753 1754 vap->iv_stats.is_rx_deauth++; 1755 vap->iv_stats.is_rx_deauth_code = reason; 1756 IEEE80211_NODE_STAT(ni, rx_deauth); 1757 1758 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1759 "recv deauthenticate (reason %d)", reason); 1760 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1761 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1762 break; 1763 } 1764 1765 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1766 uint16_t reason; 1767 1768 if (vap->iv_state != IEEE80211_S_RUN && 1769 vap->iv_state != IEEE80211_S_ASSOC && 1770 vap->iv_state != IEEE80211_S_AUTH) { 1771 vap->iv_stats.is_rx_mgtdiscard++; 1772 return; 1773 } 1774 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1775 /* NB: can happen when in promiscuous mode */ 1776 vap->iv_stats.is_rx_mgtdiscard++; 1777 break; 1778 } 1779 1780 /* 1781 * disassoc frame format 1782 * [2] reason 1783 */ 1784 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1785 reason = le16toh(*(uint16_t *)frm); 1786 1787 vap->iv_stats.is_rx_disassoc++; 1788 vap->iv_stats.is_rx_disassoc_code = reason; 1789 IEEE80211_NODE_STAT(ni, rx_disassoc); 1790 1791 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1792 "recv disassociate (reason %d)", reason); 1793 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1794 break; 1795 } 1796 1797 case IEEE80211_FC0_SUBTYPE_ACTION: 1798 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1799 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1800 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1801 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1802 wh, NULL, "%s", "not for us"); 1803 vap->iv_stats.is_rx_mgtdiscard++; 1804 } else if (vap->iv_state != IEEE80211_S_RUN) { 1805 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1806 wh, NULL, "wrong state %s", 1807 ieee80211_state_name[vap->iv_state]); 1808 vap->iv_stats.is_rx_mgtdiscard++; 1809 } else { 1810 if (ieee80211_parse_action(ni, m0) == 0) 1811 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1812 } 1813 break; 1814 1815 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1816 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1817 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1818 case IEEE80211_FC0_SUBTYPE_ATIM: 1819 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1820 wh, NULL, "%s", "not handled"); 1821 vap->iv_stats.is_rx_mgtdiscard++; 1822 break; 1823 1824 default: 1825 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1826 wh, "mgt", "subtype 0x%x not handled", subtype); 1827 vap->iv_stats.is_rx_badsubtype++; 1828 break; 1829 } 1830 #undef ISREASSOC 1831 #undef ISPROBE 1832 } 1833 1834 static void 1835 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1836 { 1837 switch (subtype) { 1838 case IEEE80211_FC0_SUBTYPE_BAR: 1839 ieee80211_recv_bar(ni, m); 1840 break; 1841 } 1842 } 1843