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=%6D, addr1=%6D", 619 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 620 vap->iv_stats.is_rx_wrongbss++; 621 goto out; 622 } 623 624 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 625 ni->ni_noise = nf; 626 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 627 uint8_t tid = ieee80211_gettid(wh); 628 if (IEEE80211_QOS_HAS_SEQ(wh) && 629 TID_TO_WME_AC(tid) >= WME_AC_VI) 630 ic->ic_wme.wme_hipri_traffic++; 631 rxseq = le16toh(*(uint16_t *)wh->i_seq); 632 if (! ieee80211_check_rxseq(ni, wh)) { 633 /* duplicate, discard */ 634 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 635 bssid, "duplicate", 636 "seqno <%u,%u> fragno <%u,%u> tid %u", 637 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 638 ni->ni_rxseqs[tid] >> 639 IEEE80211_SEQ_SEQ_SHIFT, 640 rxseq & IEEE80211_SEQ_FRAG_MASK, 641 ni->ni_rxseqs[tid] & 642 IEEE80211_SEQ_FRAG_MASK, 643 tid); 644 vap->iv_stats.is_rx_dup++; 645 IEEE80211_NODE_STAT(ni, rx_dup); 646 goto out; 647 } 648 ni->ni_rxseqs[tid] = rxseq; 649 } 650 } 651 652 switch (type) { 653 case IEEE80211_FC0_TYPE_DATA: 654 hdrspace = ieee80211_hdrspace(ic, wh); 655 if (m->m_len < hdrspace && 656 (m = m_pullup(m, hdrspace)) == NULL) { 657 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 658 ni->ni_macaddr, NULL, 659 "data too short: expecting %u", hdrspace); 660 vap->iv_stats.is_rx_tooshort++; 661 goto out; /* XXX */ 662 } 663 /* 664 * Handle A-MPDU re-ordering. If the frame is to be 665 * processed directly then ieee80211_ampdu_reorder 666 * will return 0; otherwise it has consumed the mbuf 667 * and we should do nothing more with it. 668 */ 669 if ((m->m_flags & M_AMPDU) && 670 (dir == IEEE80211_FC1_DIR_FROMDS || 671 dir == IEEE80211_FC1_DIR_DSTODS) && 672 ieee80211_ampdu_reorder(ni, m) != 0) { 673 m = NULL; 674 goto out; 675 } 676 resubmit_ampdu: 677 if (dir == IEEE80211_FC1_DIR_FROMDS) { 678 if ((ifp->if_flags & IFF_SIMPLEX) && 679 isfromds_mcastecho(vap, wh)) { 680 /* 681 * In IEEE802.11 network, multicast 682 * packets sent from "me" are broadcast 683 * from the AP; silently discard for 684 * SIMPLEX interface. 685 */ 686 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 687 wh, "data", "%s", "multicast echo"); 688 vap->iv_stats.is_rx_mcastecho++; 689 goto out; 690 } 691 if ((vap->iv_flags & IEEE80211_F_DWDS) && 692 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 693 /* 694 * DWDS sta's must drop 3-address mcast frames 695 * as they will be sent separately as a 4-addr 696 * frame. Accepting the 3-addr frame will 697 * confuse the bridge into thinking the sending 698 * sta is located at the end of WDS link. 699 */ 700 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 701 "3-address data", "%s", "DWDS enabled"); 702 vap->iv_stats.is_rx_mcastecho++; 703 goto out; 704 } 705 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 706 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 707 IEEE80211_DISCARD(vap, 708 IEEE80211_MSG_INPUT, wh, "4-address data", 709 "%s", "DWDS not enabled"); 710 vap->iv_stats.is_rx_wrongdir++; 711 goto out; 712 } 713 if ((ifp->if_flags & IFF_SIMPLEX) && 714 isdstods_mcastecho(vap, wh)) { 715 /* 716 * In IEEE802.11 network, multicast 717 * packets sent from "me" are broadcast 718 * from the AP; silently discard for 719 * SIMPLEX interface. 720 */ 721 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 722 "4-address data", "%s", "multicast echo"); 723 vap->iv_stats.is_rx_mcastecho++; 724 goto out; 725 } 726 } else { 727 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 728 "data", "incorrect dir 0x%x", dir); 729 vap->iv_stats.is_rx_wrongdir++; 730 goto out; 731 } 732 733 /* 734 * Handle privacy requirements. Note that we 735 * must not be preempted from here until after 736 * we (potentially) call ieee80211_crypto_demic; 737 * otherwise we may violate assumptions in the 738 * crypto cipher modules used to do delayed update 739 * of replay sequence numbers. 740 */ 741 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 742 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 743 /* 744 * Discard encrypted frames when privacy is off. 745 */ 746 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 747 wh, "WEP", "%s", "PRIVACY off"); 748 vap->iv_stats.is_rx_noprivacy++; 749 IEEE80211_NODE_STAT(ni, rx_noprivacy); 750 goto out; 751 } 752 key = ieee80211_crypto_decap(ni, m, hdrspace); 753 if (key == NULL) { 754 /* NB: stats+msgs handled in crypto_decap */ 755 IEEE80211_NODE_STAT(ni, rx_wepfail); 756 goto out; 757 } 758 wh = mtod(m, struct ieee80211_frame *); 759 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 760 } else { 761 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 762 key = NULL; 763 } 764 765 /* 766 * Save QoS bits for use below--before we strip the header. 767 */ 768 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 769 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 770 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 771 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 772 } else 773 qos = 0; 774 775 /* 776 * Next up, any fragmentation. 777 */ 778 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 779 m = ieee80211_defrag(ni, m, hdrspace); 780 if (m == NULL) { 781 /* Fragment dropped or frame not complete yet */ 782 goto out; 783 } 784 } 785 wh = NULL; /* no longer valid, catch any uses */ 786 787 /* 788 * Next strip any MSDU crypto bits. 789 */ 790 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 791 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 792 ni->ni_macaddr, "data", "%s", "demic error"); 793 vap->iv_stats.is_rx_demicfail++; 794 IEEE80211_NODE_STAT(ni, rx_demicfail); 795 goto out; 796 } 797 798 /* copy to listener after decrypt */ 799 if (ieee80211_radiotap_active_vap(vap)) 800 ieee80211_radiotap_rx(vap, m); 801 need_tap = 0; 802 803 /* 804 * Finally, strip the 802.11 header. 805 */ 806 m = ieee80211_decap(vap, m, hdrspace); 807 if (m == NULL) { 808 /* XXX mask bit to check for both */ 809 /* don't count Null data frames as errors */ 810 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 811 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 812 goto out; 813 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 814 ni->ni_macaddr, "data", "%s", "decap error"); 815 vap->iv_stats.is_rx_decap++; 816 IEEE80211_NODE_STAT(ni, rx_decap); 817 goto err; 818 } 819 eh = mtod(m, struct ether_header *); 820 if (!ieee80211_node_is_authorized(ni)) { 821 /* 822 * Deny any non-PAE frames received prior to 823 * authorization. For open/shared-key 824 * authentication the port is mark authorized 825 * after authentication completes. For 802.1x 826 * the port is not marked authorized by the 827 * authenticator until the handshake has completed. 828 */ 829 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 830 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 831 eh->ether_shost, "data", 832 "unauthorized port: ether type 0x%x len %u", 833 eh->ether_type, m->m_pkthdr.len); 834 vap->iv_stats.is_rx_unauth++; 835 IEEE80211_NODE_STAT(ni, rx_unauth); 836 goto err; 837 } 838 } else { 839 /* 840 * When denying unencrypted frames, discard 841 * any non-PAE frames received without encryption. 842 */ 843 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 844 (key == NULL && (m->m_flags & M_WEP) == 0) && 845 eh->ether_type != htons(ETHERTYPE_PAE)) { 846 /* 847 * Drop unencrypted frames. 848 */ 849 vap->iv_stats.is_rx_unencrypted++; 850 IEEE80211_NODE_STAT(ni, rx_unencrypted); 851 goto out; 852 } 853 } 854 /* XXX require HT? */ 855 if (qos & IEEE80211_QOS_AMSDU) { 856 m = ieee80211_decap_amsdu(ni, m); 857 if (m == NULL) 858 return IEEE80211_FC0_TYPE_DATA; 859 } else { 860 #ifdef IEEE80211_SUPPORT_SUPERG 861 m = ieee80211_decap_fastframe(vap, ni, m); 862 if (m == NULL) 863 return IEEE80211_FC0_TYPE_DATA; 864 #endif 865 } 866 ieee80211_deliver_data(vap, ni, m); 867 return IEEE80211_FC0_TYPE_DATA; 868 869 case IEEE80211_FC0_TYPE_MGT: 870 vap->iv_stats.is_rx_mgmt++; 871 IEEE80211_NODE_STAT(ni, rx_mgmt); 872 if (dir != IEEE80211_FC1_DIR_NODS) { 873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 874 wh, "data", "incorrect dir 0x%x", dir); 875 vap->iv_stats.is_rx_wrongdir++; 876 goto err; 877 } 878 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 879 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 880 ni->ni_macaddr, "mgt", "too short: len %u", 881 m->m_pkthdr.len); 882 vap->iv_stats.is_rx_tooshort++; 883 goto out; 884 } 885 #ifdef IEEE80211_DEBUG 886 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 887 ieee80211_msg_dumppkts(vap)) { 888 if_printf(ifp, "received %s from %s rssi %d\n", 889 ieee80211_mgt_subtype_name[subtype >> 890 IEEE80211_FC0_SUBTYPE_SHIFT], 891 ether_sprintf(wh->i_addr2), rssi); 892 } 893 #endif 894 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 895 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 896 /* 897 * Only shared key auth frames with a challenge 898 * should be encrypted, discard all others. 899 */ 900 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 901 wh, ieee80211_mgt_subtype_name[subtype >> 902 IEEE80211_FC0_SUBTYPE_SHIFT], 903 "%s", "WEP set but not permitted"); 904 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 905 goto out; 906 } 907 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 908 /* 909 * Discard encrypted frames when privacy is off. 910 */ 911 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 912 wh, "mgt", "%s", "WEP set but PRIVACY off"); 913 vap->iv_stats.is_rx_noprivacy++; 914 goto out; 915 } 916 hdrspace = ieee80211_hdrspace(ic, wh); 917 key = ieee80211_crypto_decap(ni, m, hdrspace); 918 if (key == NULL) { 919 /* NB: stats+msgs handled in crypto_decap */ 920 goto out; 921 } 922 wh = mtod(m, struct ieee80211_frame *); 923 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 924 } 925 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 926 goto out; 927 928 case IEEE80211_FC0_TYPE_CTL: 929 vap->iv_stats.is_rx_ctl++; 930 IEEE80211_NODE_STAT(ni, rx_ctrl); 931 vap->iv_recv_ctl(ni, m, subtype); 932 goto out; 933 934 default: 935 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 936 wh, NULL, "bad frame type 0x%x", type); 937 /* should not come here */ 938 break; 939 } 940 err: 941 IFNET_STAT_INC(ifp, ierrors, 1); 942 out: 943 if (m != NULL) { 944 if (need_tap && ieee80211_radiotap_active_vap(vap)) 945 ieee80211_radiotap_rx(vap, m); 946 m_freem(m); 947 } 948 return type; 949 } 950 951 static void 952 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 953 int rssi, int nf, uint16_t seq, uint16_t status) 954 { 955 struct ieee80211vap *vap = ni->ni_vap; 956 957 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 958 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 959 ni->ni_macaddr, "open auth", 960 "bad sta auth mode %u", ni->ni_authmode); 961 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 962 return; 963 } 964 if (vap->iv_state != IEEE80211_S_AUTH || 965 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 966 vap->iv_stats.is_rx_bad_auth++; 967 return; 968 } 969 if (status != 0) { 970 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 971 ni, "open auth failed (reason %d)", status); 972 vap->iv_stats.is_rx_auth_fail++; 973 vap->iv_stats.is_rx_authfail_code = status; 974 ieee80211_new_state(vap, IEEE80211_S_SCAN, 975 IEEE80211_SCAN_FAIL_STATUS); 976 } else 977 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 978 } 979 980 static void 981 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 982 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 983 uint16_t seq, uint16_t status) 984 { 985 struct ieee80211vap *vap = ni->ni_vap; 986 uint8_t *challenge; 987 int estatus; 988 989 /* 990 * NB: this can happen as we allow pre-shared key 991 * authentication to be enabled w/o wep being turned 992 * on so that configuration of these can be done 993 * in any order. It may be better to enforce the 994 * ordering in which case this check would just be 995 * for sanity/consistency. 996 */ 997 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 998 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 999 ni->ni_macaddr, "shared key auth", 1000 "%s", " PRIVACY is disabled"); 1001 estatus = IEEE80211_STATUS_ALG; 1002 goto bad; 1003 } 1004 /* 1005 * Pre-shared key authentication is evil; accept 1006 * it only if explicitly configured (it is supported 1007 * mainly for compatibility with clients like OS X). 1008 */ 1009 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1010 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1011 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1012 ni->ni_macaddr, "shared key auth", 1013 "bad sta auth mode %u", ni->ni_authmode); 1014 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1015 estatus = IEEE80211_STATUS_ALG; 1016 goto bad; 1017 } 1018 1019 challenge = NULL; 1020 if (frm + 1 < efrm) { 1021 if ((frm[1] + 2) > (efrm - frm)) { 1022 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1023 ni->ni_macaddr, "shared key auth", 1024 "ie %d/%ld too long", 1025 frm[0], (frm[1] + 2) - (efrm - frm)); 1026 vap->iv_stats.is_rx_bad_auth++; 1027 estatus = IEEE80211_STATUS_CHALLENGE; 1028 goto bad; 1029 } 1030 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1031 challenge = frm; 1032 frm += frm[1] + 2; 1033 } 1034 switch (seq) { 1035 case IEEE80211_AUTH_SHARED_CHALLENGE: 1036 case IEEE80211_AUTH_SHARED_RESPONSE: 1037 if (challenge == NULL) { 1038 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1039 ni->ni_macaddr, "shared key auth", 1040 "%s", "no challenge"); 1041 vap->iv_stats.is_rx_bad_auth++; 1042 estatus = IEEE80211_STATUS_CHALLENGE; 1043 goto bad; 1044 } 1045 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1046 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1047 ni->ni_macaddr, "shared key auth", 1048 "bad challenge len %d", challenge[1]); 1049 vap->iv_stats.is_rx_bad_auth++; 1050 estatus = IEEE80211_STATUS_CHALLENGE; 1051 goto bad; 1052 } 1053 default: 1054 break; 1055 } 1056 if (vap->iv_state != IEEE80211_S_AUTH) 1057 return; 1058 switch (seq) { 1059 case IEEE80211_AUTH_SHARED_PASS: 1060 if (ni->ni_challenge != NULL) { 1061 kfree(ni->ni_challenge, M_80211_NODE); 1062 ni->ni_challenge = NULL; 1063 } 1064 if (status != 0) { 1065 IEEE80211_NOTE_FRAME(vap, 1066 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1067 "shared key auth failed (reason %d)", status); 1068 vap->iv_stats.is_rx_auth_fail++; 1069 vap->iv_stats.is_rx_authfail_code = status; 1070 return; 1071 } 1072 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1073 break; 1074 case IEEE80211_AUTH_SHARED_CHALLENGE: 1075 if (!ieee80211_alloc_challenge(ni)) 1076 return; 1077 /* XXX could optimize by passing recvd challenge */ 1078 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1079 IEEE80211_SEND_MGMT(ni, 1080 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1081 break; 1082 default: 1083 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1084 wh, "shared key auth", "bad seq %d", seq); 1085 vap->iv_stats.is_rx_bad_auth++; 1086 return; 1087 } 1088 return; 1089 bad: 1090 /* 1091 * Kick the state machine. This short-circuits 1092 * using the mgt frame timeout to trigger the 1093 * state transition. 1094 */ 1095 if (vap->iv_state == IEEE80211_S_AUTH) 1096 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1097 IEEE80211_SCAN_FAIL_STATUS); 1098 } 1099 1100 int 1101 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1102 const struct ieee80211_frame *wh) 1103 { 1104 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1105 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1106 u_int len = frm[1], qosinfo; 1107 int i; 1108 1109 if (len < sizeof(struct ieee80211_wme_param)-2) { 1110 IEEE80211_DISCARD_IE(vap, 1111 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1112 wh, "WME", "too short, len %u", len); 1113 return -1; 1114 } 1115 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1116 qosinfo &= WME_QOSINFO_COUNT; 1117 /* XXX do proper check for wraparound */ 1118 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1119 return 0; 1120 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1121 for (i = 0; i < WME_NUM_AC; i++) { 1122 struct wmeParams *wmep = 1123 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1124 /* NB: ACI not used */ 1125 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1126 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1127 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1128 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1129 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1130 frm += 4; 1131 } 1132 wme->wme_wmeChanParams.cap_info = qosinfo; 1133 return 1; 1134 #undef MS 1135 } 1136 1137 /* 1138 * Process 11h Channel Switch Announcement (CSA) ie. If this 1139 * is the first CSA then initiate the switch. Otherwise we 1140 * track state and trigger completion and/or cancel of the switch. 1141 * XXX should be public for IBSS use 1142 */ 1143 static void 1144 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1145 const struct ieee80211_frame *wh) 1146 { 1147 struct ieee80211com *ic = vap->iv_ic; 1148 const struct ieee80211_csa_ie *csa = 1149 (const struct ieee80211_csa_ie *) frm; 1150 1151 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1152 ("state %s", ieee80211_state_name[vap->iv_state])); 1153 1154 if (csa->csa_mode > 1) { 1155 IEEE80211_DISCARD_IE(vap, 1156 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1157 wh, "CSA", "invalid mode %u", csa->csa_mode); 1158 return; 1159 } 1160 IEEE80211_LOCK(ic); 1161 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1162 /* 1163 * Convert the channel number to a channel reference. We 1164 * try first to preserve turbo attribute of the current 1165 * channel then fallback. Note this will not work if the 1166 * CSA specifies a channel that requires a band switch (e.g. 1167 * 11a => 11g). This is intentional as 11h is defined only 1168 * for 5GHz/11a and because the switch does not involve a 1169 * reassociation, protocol state (capabilities, negotated 1170 * rates, etc) may/will be wrong. 1171 */ 1172 struct ieee80211_channel *c = 1173 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1174 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1175 if (c == NULL) { 1176 c = ieee80211_find_channel_byieee(ic, 1177 csa->csa_newchan, 1178 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1179 if (c == NULL) { 1180 IEEE80211_DISCARD_IE(vap, 1181 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1182 wh, "CSA", "invalid channel %u", 1183 csa->csa_newchan); 1184 goto done; 1185 } 1186 } 1187 #if IEEE80211_CSA_COUNT_MIN > 0 1188 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1189 /* 1190 * Require at least IEEE80211_CSA_COUNT_MIN count to 1191 * reduce the risk of being redirected by a fabricated 1192 * CSA. If a valid CSA is dropped we'll still get a 1193 * beacon miss when the AP leaves the channel so we'll 1194 * eventually follow to the new channel. 1195 * 1196 * NOTE: this violates the 11h spec that states that 1197 * count may be any value and if 0 then a switch 1198 * should happen asap. 1199 */ 1200 IEEE80211_DISCARD_IE(vap, 1201 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1202 wh, "CSA", "count %u too small, must be >= %u", 1203 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1204 goto done; 1205 } 1206 #endif 1207 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1208 } else { 1209 /* 1210 * Validate this ie against the initial CSA. We require 1211 * mode and channel not change and the count must be 1212 * monotonically decreasing. This may be pointless and 1213 * canceling the switch as a result may be too paranoid but 1214 * in the worst case if we drop out of CSA because of this 1215 * and the AP does move then we'll just end up taking a 1216 * beacon miss and scan to find the AP. 1217 * 1218 * XXX may want <= on count as we also process ProbeResp 1219 * frames and those may come in w/ the same count as the 1220 * previous beacon; but doing so leaves us open to a stuck 1221 * count until we add a dead-man timer 1222 */ 1223 if (!(csa->csa_count < ic->ic_csa_count && 1224 csa->csa_mode == ic->ic_csa_mode && 1225 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1226 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1227 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1228 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1229 ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count, 1230 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1231 ieee80211_csa_cancelswitch(ic); 1232 } else { 1233 if (csa->csa_count <= 1) 1234 ieee80211_csa_completeswitch(ic); 1235 else 1236 ic->ic_csa_count = csa->csa_count; 1237 } 1238 } 1239 done: 1240 IEEE80211_UNLOCK(ic); 1241 } 1242 1243 /* 1244 * Return non-zero if a background scan may be continued: 1245 * o bg scan is active 1246 * o no channel switch is pending 1247 * o there has not been any traffic recently 1248 * 1249 * Note we do not check if there is an administrative enable; 1250 * this is only done to start the scan. We assume that any 1251 * change in state will be accompanied by a request to cancel 1252 * active scans which will otherwise cause this test to fail. 1253 */ 1254 static __inline int 1255 contbgscan(struct ieee80211vap *vap) 1256 { 1257 struct ieee80211com *ic = vap->iv_ic; 1258 1259 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1260 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1261 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1262 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1263 } 1264 1265 /* 1266 * Return non-zero if a backgrond scan may be started: 1267 * o bg scanning is administratively enabled 1268 * o no channel switch is pending 1269 * o we are not boosted on a dynamic turbo channel 1270 * o there has not been a scan recently 1271 * o there has not been any traffic recently 1272 */ 1273 static __inline int 1274 startbgscan(struct ieee80211vap *vap) 1275 { 1276 struct ieee80211com *ic = vap->iv_ic; 1277 1278 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1279 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1280 #ifdef IEEE80211_SUPPORT_SUPERG 1281 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1282 #endif 1283 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1284 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1285 } 1286 1287 static void 1288 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1289 int subtype, int rssi, int nf) 1290 { 1291 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1292 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1293 struct ieee80211vap *vap = ni->ni_vap; 1294 struct ieee80211com *ic = ni->ni_ic; 1295 struct ieee80211_frame *wh; 1296 uint8_t *frm, *efrm; 1297 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1298 uint8_t rate; 1299 int ht_state_change = 0; 1300 1301 wh = mtod(m0, struct ieee80211_frame *); 1302 frm = (uint8_t *)&wh[1]; 1303 efrm = mtod(m0, uint8_t *) + m0->m_len; 1304 switch (subtype) { 1305 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1306 case IEEE80211_FC0_SUBTYPE_BEACON: { 1307 struct ieee80211_scanparams scan; 1308 /* 1309 * We process beacon/probe response frames: 1310 * o when scanning, or 1311 * o station mode when associated (to collect state 1312 * updates such as 802.11g slot time) 1313 * Frames otherwise received are discarded. 1314 */ 1315 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1316 vap->iv_stats.is_rx_mgtdiscard++; 1317 return; 1318 } 1319 /* XXX probe response in sta mode when !scanning? */ 1320 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) { 1321 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1322 vap->iv_stats.is_beacon_bad++; 1323 return; 1324 } 1325 1326 /* 1327 * Count frame now that we know it's to be processed. 1328 */ 1329 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1330 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1331 IEEE80211_NODE_STAT(ni, rx_beacons); 1332 } else 1333 IEEE80211_NODE_STAT(ni, rx_proberesp); 1334 /* 1335 * When operating in station mode, check for state updates. 1336 * Be careful to ignore beacons received while doing a 1337 * background scan. We consider only 11g/WMM stuff right now. 1338 */ 1339 if (ni->ni_associd != 0 && 1340 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1341 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1342 /* record tsf of last beacon */ 1343 memcpy(ni->ni_tstamp.data, scan.tstamp, 1344 sizeof(ni->ni_tstamp)); 1345 /* count beacon frame for s/w bmiss handling */ 1346 vap->iv_swbmiss_count++; 1347 vap->iv_bmiss_count = 0; 1348 if (ni->ni_erp != scan.erp) { 1349 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1350 wh->i_addr2, 1351 "erp change: was 0x%x, now 0x%x", 1352 ni->ni_erp, scan.erp); 1353 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1354 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1355 ic->ic_flags |= IEEE80211_F_USEPROT; 1356 else 1357 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1358 ni->ni_erp = scan.erp; 1359 /* XXX statistic */ 1360 /* XXX driver notification */ 1361 } 1362 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1363 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1364 wh->i_addr2, 1365 "capabilities change: was 0x%x, now 0x%x", 1366 ni->ni_capinfo, scan.capinfo); 1367 /* 1368 * NB: we assume short preamble doesn't 1369 * change dynamically 1370 */ 1371 ieee80211_set_shortslottime(ic, 1372 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1373 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1374 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1375 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1376 /* XXX statistic */ 1377 } 1378 if (scan.wme != NULL && 1379 (ni->ni_flags & IEEE80211_NODE_QOS) && 1380 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1381 ieee80211_wme_updateparams(vap); 1382 #ifdef IEEE80211_SUPPORT_SUPERG 1383 if (scan.ath != NULL) 1384 ieee80211_parse_athparams(ni, scan.ath, wh); 1385 #endif 1386 if (scan.htcap != NULL && scan.htinfo != NULL && 1387 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1388 /* XXX state changes? */ 1389 if (ieee80211_ht_updateparams(ni, 1390 scan.htcap, scan.htinfo)) 1391 ht_state_change = 1; 1392 } 1393 if (scan.quiet) 1394 ic->ic_set_quiet(ni, scan.quiet); 1395 1396 if (scan.tim != NULL) { 1397 struct ieee80211_tim_ie *tim = 1398 (struct ieee80211_tim_ie *) scan.tim; 1399 /* 1400 * XXX Check/debug this code; see if it's about 1401 * the right time to force the VAP awake if we 1402 * receive a frame destined for us? 1403 */ 1404 int aid = IEEE80211_AID(ni->ni_associd); 1405 int ix = aid / NBBY; 1406 int min = tim->tim_bitctl &~ 1; 1407 int max = tim->tim_len + min - 4; 1408 1409 /* 1410 * Only do this for unicast traffic in the TIM 1411 * The multicast traffic notification for 1412 * the scan notification stuff should occur 1413 * differently. 1414 */ 1415 if (min <= ix && ix <= max && 1416 isset(tim->tim_bitmap - min, aid)) { 1417 ieee80211_sta_tim_notify(vap, 1); 1418 ic->ic_lastdata = ticks; 1419 } 1420 1421 /* 1422 * XXX TODO: do a separate notification 1423 * for the multicast bit being set. 1424 */ 1425 #if 0 1426 if (tim->tim_bitctl & 1) { 1427 ieee80211_sta_tim_notify(vap, 1); 1428 ic->ic_lastdata = ticks; 1429 } 1430 #endif 1431 1432 ni->ni_dtim_count = tim->tim_count; 1433 ni->ni_dtim_period = tim->tim_period; 1434 } 1435 if (scan.csa != NULL && 1436 (vap->iv_flags & IEEE80211_F_DOTH)) 1437 ieee80211_parse_csaparams(vap, scan.csa, wh); 1438 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1439 /* 1440 * No CSA ie or 11h disabled, but a channel 1441 * switch is pending; drop out so we aren't 1442 * stuck in CSA state. If the AP really is 1443 * moving we'll get a beacon miss and scan. 1444 */ 1445 IEEE80211_LOCK(ic); 1446 ieee80211_csa_cancelswitch(ic); 1447 IEEE80211_UNLOCK(ic); 1448 } 1449 /* 1450 * If scanning, pass the info to the scan module. 1451 * Otherwise, check if it's the right time to do 1452 * a background scan. Background scanning must 1453 * be enabled and we must not be operating in the 1454 * turbo phase of dynamic turbo mode. Then, 1455 * it's been a while since the last background 1456 * scan and if no data frames have come through 1457 * recently, kick off a scan. Note that this 1458 * is the mechanism by which a background scan 1459 * is started _and_ continued each time we 1460 * return on-channel to receive a beacon from 1461 * our ap. 1462 */ 1463 if (ic->ic_flags & IEEE80211_F_SCAN) { 1464 ieee80211_add_scan(vap, &scan, wh, 1465 subtype, rssi, nf); 1466 } else if (contbgscan(vap)) { 1467 ieee80211_bg_scan(vap, 0); 1468 } else if (startbgscan(vap)) { 1469 vap->iv_stats.is_scan_bg++; 1470 #if 0 1471 /* wakeup if we are sleeing */ 1472 ieee80211_set_pwrsave(vap, 0); 1473 #endif 1474 ieee80211_bg_scan(vap, 0); 1475 } 1476 1477 /* 1478 * Put the station to sleep if we haven't seen 1479 * traffic in a while. 1480 */ 1481 IEEE80211_LOCK(ic); 1482 ieee80211_sta_ps_timer_check(vap); 1483 IEEE80211_UNLOCK(ic); 1484 1485 /* 1486 * If we've had a channel width change (eg HT20<->HT40) 1487 * then schedule a delayed driver notification. 1488 */ 1489 if (ht_state_change) 1490 ieee80211_update_chw(ic); 1491 return; 1492 } 1493 /* 1494 * If scanning, just pass information to the scan module. 1495 */ 1496 if (ic->ic_flags & IEEE80211_F_SCAN) { 1497 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1498 /* 1499 * Actively scanning a channel marked passive; 1500 * send a probe request now that we know there 1501 * is 802.11 traffic present. 1502 * 1503 * XXX check if the beacon we recv'd gives 1504 * us what we need and suppress the probe req 1505 */ 1506 ieee80211_probe_curchan(vap, 1); 1507 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1508 } 1509 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1510 return; 1511 } 1512 break; 1513 } 1514 1515 case IEEE80211_FC0_SUBTYPE_AUTH: { 1516 uint16_t algo, seq, status; 1517 /* 1518 * auth frame format 1519 * [2] algorithm 1520 * [2] sequence 1521 * [2] status 1522 * [tlv*] challenge 1523 */ 1524 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1525 algo = le16toh(*(uint16_t *)frm); 1526 seq = le16toh(*(uint16_t *)(frm + 2)); 1527 status = le16toh(*(uint16_t *)(frm + 4)); 1528 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1529 "recv auth frame with algorithm %d seq %d", algo, seq); 1530 1531 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1532 IEEE80211_DISCARD(vap, 1533 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1534 wh, "auth", "%s", "TKIP countermeasures enabled"); 1535 vap->iv_stats.is_rx_auth_countermeasures++; 1536 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1537 ieee80211_send_error(ni, wh->i_addr2, 1538 IEEE80211_FC0_SUBTYPE_AUTH, 1539 IEEE80211_REASON_MIC_FAILURE); 1540 } 1541 return; 1542 } 1543 if (algo == IEEE80211_AUTH_ALG_SHARED) 1544 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1545 seq, status); 1546 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1547 sta_auth_open(ni, wh, rssi, nf, seq, status); 1548 else { 1549 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1550 wh, "auth", "unsupported alg %d", algo); 1551 vap->iv_stats.is_rx_auth_unsupported++; 1552 return; 1553 } 1554 break; 1555 } 1556 1557 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1558 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1559 uint16_t capinfo, associd; 1560 uint16_t status; 1561 1562 if (vap->iv_state != IEEE80211_S_ASSOC) { 1563 vap->iv_stats.is_rx_mgtdiscard++; 1564 return; 1565 } 1566 1567 /* 1568 * asresp frame format 1569 * [2] capability information 1570 * [2] status 1571 * [2] association ID 1572 * [tlv] supported rates 1573 * [tlv] extended supported rates 1574 * [tlv] WME 1575 * [tlv] HT capabilities 1576 * [tlv] HT info 1577 */ 1578 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1579 ni = vap->iv_bss; 1580 capinfo = le16toh(*(uint16_t *)frm); 1581 frm += 2; 1582 status = le16toh(*(uint16_t *)frm); 1583 frm += 2; 1584 if (status != 0) { 1585 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1586 wh->i_addr2, "%sassoc failed (reason %d)", 1587 ISREASSOC(subtype) ? "re" : "", status); 1588 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1589 return; 1590 } 1591 associd = le16toh(*(uint16_t *)frm); 1592 frm += 2; 1593 1594 rates = xrates = wme = htcap = htinfo = NULL; 1595 while (efrm - frm > 1) { 1596 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1597 switch (*frm) { 1598 case IEEE80211_ELEMID_RATES: 1599 rates = frm; 1600 break; 1601 case IEEE80211_ELEMID_XRATES: 1602 xrates = frm; 1603 break; 1604 case IEEE80211_ELEMID_HTCAP: 1605 htcap = frm; 1606 break; 1607 case IEEE80211_ELEMID_HTINFO: 1608 htinfo = frm; 1609 break; 1610 case IEEE80211_ELEMID_VENDOR: 1611 if (iswmeoui(frm)) 1612 wme = frm; 1613 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1614 /* 1615 * Accept pre-draft HT ie's if the 1616 * standard ones have not been seen. 1617 */ 1618 if (ishtcapoui(frm)) { 1619 if (htcap == NULL) 1620 htcap = frm; 1621 } else if (ishtinfooui(frm)) { 1622 if (htinfo == NULL) 1623 htinfo = frm; 1624 } 1625 } 1626 /* XXX Atheros OUI support */ 1627 break; 1628 } 1629 frm += frm[1] + 2; 1630 } 1631 1632 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1633 if (xrates != NULL) 1634 IEEE80211_VERIFY_ELEMENT(xrates, 1635 IEEE80211_RATE_MAXSIZE - rates[1], return); 1636 rate = ieee80211_setup_rates(ni, rates, xrates, 1637 IEEE80211_F_JOIN | 1638 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1639 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1640 if (rate & IEEE80211_RATE_BASIC) { 1641 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1642 wh->i_addr2, 1643 "%sassoc failed (rate set mismatch)", 1644 ISREASSOC(subtype) ? "re" : ""); 1645 vap->iv_stats.is_rx_assoc_norate++; 1646 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1647 IEEE80211_SCAN_FAIL_STATUS); 1648 return; 1649 } 1650 1651 ni->ni_capinfo = capinfo; 1652 ni->ni_associd = associd; 1653 if (ni->ni_jointime == 0) 1654 ni->ni_jointime = time_uptime; 1655 if (wme != NULL && 1656 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1657 ni->ni_flags |= IEEE80211_NODE_QOS; 1658 ieee80211_wme_updateparams(vap); 1659 } else 1660 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1661 /* 1662 * Setup HT state according to the negotiation. 1663 * 1664 * NB: shouldn't need to check if HT use is enabled but some 1665 * ap's send back HT ie's even when we don't indicate we 1666 * are HT capable in our AssocReq. 1667 */ 1668 if (htcap != NULL && htinfo != NULL && 1669 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1670 ieee80211_ht_node_init(ni); 1671 ieee80211_ht_updateparams(ni, htcap, htinfo); 1672 ieee80211_setup_htrates(ni, htcap, 1673 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1674 ieee80211_setup_basic_htrates(ni, htinfo); 1675 ieee80211_node_setuptxparms(ni); 1676 ieee80211_ratectl_node_init(ni); 1677 } else { 1678 #ifdef IEEE80211_SUPPORT_SUPERG 1679 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1680 ieee80211_ff_node_init(ni); 1681 #endif 1682 } 1683 /* 1684 * Configure state now that we are associated. 1685 * 1686 * XXX may need different/additional driver callbacks? 1687 */ 1688 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1689 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1690 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1691 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1692 } else { 1693 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1694 ic->ic_flags |= IEEE80211_F_USEBARKER; 1695 } 1696 ieee80211_set_shortslottime(ic, 1697 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1698 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1699 /* 1700 * Honor ERP protection. 1701 * 1702 * NB: ni_erp should zero for non-11g operation. 1703 */ 1704 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1705 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1706 ic->ic_flags |= IEEE80211_F_USEPROT; 1707 else 1708 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1709 IEEE80211_NOTE_MAC(vap, 1710 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1711 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1712 ISREASSOC(subtype) ? "re" : "", 1713 IEEE80211_NODE_AID(ni), 1714 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1715 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1716 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1717 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1718 ni->ni_flags & IEEE80211_NODE_HT ? 1719 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1720 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1721 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1722 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1723 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1724 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1725 ", fast-frames" : "", 1726 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1727 ", turbo" : "" 1728 ); 1729 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1730 break; 1731 } 1732 1733 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1734 uint16_t reason; 1735 1736 if (vap->iv_state == IEEE80211_S_SCAN) { 1737 vap->iv_stats.is_rx_mgtdiscard++; 1738 return; 1739 } 1740 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1741 /* NB: can happen when in promiscuous mode */ 1742 vap->iv_stats.is_rx_mgtdiscard++; 1743 break; 1744 } 1745 1746 /* 1747 * deauth frame format 1748 * [2] reason 1749 */ 1750 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1751 reason = le16toh(*(uint16_t *)frm); 1752 1753 vap->iv_stats.is_rx_deauth++; 1754 vap->iv_stats.is_rx_deauth_code = reason; 1755 IEEE80211_NODE_STAT(ni, rx_deauth); 1756 1757 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1758 "recv deauthenticate (reason %d)", reason); 1759 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1760 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1761 break; 1762 } 1763 1764 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1765 uint16_t reason; 1766 1767 if (vap->iv_state != IEEE80211_S_RUN && 1768 vap->iv_state != IEEE80211_S_ASSOC && 1769 vap->iv_state != IEEE80211_S_AUTH) { 1770 vap->iv_stats.is_rx_mgtdiscard++; 1771 return; 1772 } 1773 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1774 /* NB: can happen when in promiscuous mode */ 1775 vap->iv_stats.is_rx_mgtdiscard++; 1776 break; 1777 } 1778 1779 /* 1780 * disassoc frame format 1781 * [2] reason 1782 */ 1783 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1784 reason = le16toh(*(uint16_t *)frm); 1785 1786 vap->iv_stats.is_rx_disassoc++; 1787 vap->iv_stats.is_rx_disassoc_code = reason; 1788 IEEE80211_NODE_STAT(ni, rx_disassoc); 1789 1790 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1791 "recv disassociate (reason %d)", reason); 1792 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1793 break; 1794 } 1795 1796 case IEEE80211_FC0_SUBTYPE_ACTION: 1797 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1798 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1799 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1800 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1801 wh, NULL, "%s", "not for us"); 1802 vap->iv_stats.is_rx_mgtdiscard++; 1803 } else if (vap->iv_state != IEEE80211_S_RUN) { 1804 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1805 wh, NULL, "wrong state %s", 1806 ieee80211_state_name[vap->iv_state]); 1807 vap->iv_stats.is_rx_mgtdiscard++; 1808 } else { 1809 if (ieee80211_parse_action(ni, m0) == 0) 1810 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1811 } 1812 break; 1813 1814 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1815 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1816 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1817 case IEEE80211_FC0_SUBTYPE_ATIM: 1818 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1819 wh, NULL, "%s", "not handled"); 1820 vap->iv_stats.is_rx_mgtdiscard++; 1821 break; 1822 1823 default: 1824 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1825 wh, "mgt", "subtype 0x%x not handled", subtype); 1826 vap->iv_stats.is_rx_badsubtype++; 1827 break; 1828 } 1829 #undef ISREASSOC 1830 #undef ISPROBE 1831 } 1832 1833 static void 1834 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1835 { 1836 switch (subtype) { 1837 case IEEE80211_FC0_SUBTYPE_BAR: 1838 ieee80211_recv_bar(ni, m); 1839 break; 1840 } 1841 } 1842