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 * $FreeBSD: head/sys/net80211/ieee80211_sta.c 203422 2010-02-03 10:07:43Z rpaulo $ 26 */ 27 28 /* 29 * IEEE 802.11 Station mode support. 30 */ 31 #include "opt_inet.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_media.h> 49 #include <net/if_llc.h> 50 #include <net/ethernet.h> 51 #include <net/route.h> 52 53 #include <net/bpf.h> 54 55 #include <netproto/802_11/ieee80211_var.h> 56 #include <netproto/802_11/ieee80211_sta.h> 57 #include <netproto/802_11/ieee80211_input.h> 58 #include <netproto/802_11/ieee80211_ratectl.h> 59 #ifdef IEEE80211_SUPPORT_SUPERG 60 #include <netproto/802_11/ieee80211_superg.h> 61 #endif 62 63 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 64 65 static void sta_vattach(struct ieee80211vap *); 66 static void sta_beacon_miss(struct ieee80211vap *); 67 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 68 static int sta_input(struct ieee80211_node *, struct mbuf *, int, int); 69 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 70 int subtype, int rssi, int nf); 71 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 72 73 void 74 ieee80211_sta_attach(struct ieee80211com *ic) 75 { 76 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 77 } 78 79 void 80 ieee80211_sta_detach(struct ieee80211com *ic) 81 { 82 } 83 84 static void 85 sta_vdetach(struct ieee80211vap *vap) 86 { 87 } 88 89 static void 90 sta_vattach(struct ieee80211vap *vap) 91 { 92 vap->iv_newstate = sta_newstate; 93 vap->iv_input = sta_input; 94 vap->iv_recv_mgmt = sta_recv_mgmt; 95 vap->iv_recv_ctl = sta_recv_ctl; 96 vap->iv_opdetach = sta_vdetach; 97 vap->iv_bmiss = sta_beacon_miss; 98 } 99 100 /* 101 * Handle a beacon miss event. The common code filters out 102 * spurious events that can happen when scanning and/or before 103 * reaching RUN state. 104 */ 105 static void 106 sta_beacon_miss(struct ieee80211vap *vap) 107 { 108 struct ieee80211com *ic = vap->iv_ic; 109 110 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 111 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 112 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 113 114 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 115 "beacon miss, mode %s state %s\n", 116 ieee80211_opmode_name[vap->iv_opmode], 117 ieee80211_state_name[vap->iv_state]); 118 119 if (vap->iv_state == IEEE80211_S_CSA) { 120 /* 121 * A Channel Switch is pending; assume we missed the 122 * beacon that would've completed the process and just 123 * force the switch. If we made a mistake we'll not 124 * find the AP on the new channel and fall back to a 125 * normal scan. 126 */ 127 ieee80211_csa_completeswitch(ic); 128 return; 129 } 130 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 131 /* 132 * Send a directed probe req before falling back to a 133 * scan; if we receive a response ic_bmiss_count will 134 * be reset. Some cards mistakenly report beacon miss 135 * so this avoids the expensive scan if the ap is 136 * still there. 137 */ 138 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 139 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 140 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 141 return; 142 } 143 vap->iv_bmiss_count = 0; 144 vap->iv_stats.is_beacon_miss++; 145 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 146 #ifdef IEEE80211_SUPPORT_SUPERG 147 struct ieee80211com *ic = vap->iv_ic; 148 149 /* 150 * If we receive a beacon miss interrupt when using 151 * dynamic turbo, attempt to switch modes before 152 * reassociating. 153 */ 154 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 155 ieee80211_dturbo_switch(vap, 156 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 157 #endif 158 /* 159 * Try to reassociate before scanning for a new ap. 160 */ 161 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 162 } else { 163 /* 164 * Somebody else is controlling state changes (e.g. 165 * a user-mode app) don't do anything that would 166 * confuse them; just drop into scan mode so they'll 167 * notified of the state change and given control. 168 */ 169 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 170 } 171 } 172 173 /* 174 * Handle deauth with reason. We retry only for 175 * the cases where we might succeed. Otherwise 176 * we downgrade the ap and scan. 177 */ 178 static void 179 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 180 { 181 switch (reason) { 182 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 183 case IEEE80211_STATUS_TIMEOUT: 184 case IEEE80211_REASON_ASSOC_EXPIRE: 185 case IEEE80211_REASON_NOT_AUTHED: 186 case IEEE80211_REASON_NOT_ASSOCED: 187 case IEEE80211_REASON_ASSOC_LEAVE: 188 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 189 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 190 break; 191 default: 192 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 193 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 194 ieee80211_check_scan_current(vap); 195 break; 196 } 197 } 198 199 /* 200 * IEEE80211_M_STA vap state machine handler. 201 * This routine handles the main states in the 802.11 protocol. 202 */ 203 static int 204 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 205 { 206 struct ieee80211com *ic = vap->iv_ic; 207 struct ieee80211_node *ni; 208 enum ieee80211_state ostate; 209 #ifdef IEEE80211_DEBUG 210 char ethstr[ETHER_ADDRSTRLEN + 1]; 211 #endif 212 ostate = vap->iv_state; 213 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 214 __func__, ieee80211_state_name[ostate], 215 ieee80211_state_name[nstate], arg); 216 vap->iv_state = nstate; /* state transition */ 217 callout_stop(&vap->iv_mgtsend); 218 if (ostate != IEEE80211_S_SCAN) 219 ieee80211_cancel_scan(vap); /* background scan */ 220 ni = vap->iv_bss; /* NB: no reference held */ 221 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 222 callout_stop(&vap->iv_swbmiss); 223 switch (nstate) { 224 case IEEE80211_S_INIT: 225 switch (ostate) { 226 case IEEE80211_S_SLEEP: 227 /* XXX wakeup */ 228 /* XXX driver hook to wakeup the hardware? */ 229 case IEEE80211_S_RUN: 230 IEEE80211_SEND_MGMT(ni, 231 IEEE80211_FC0_SUBTYPE_DISASSOC, 232 IEEE80211_REASON_ASSOC_LEAVE); 233 ieee80211_sta_leave(ni); 234 break; 235 case IEEE80211_S_ASSOC: 236 IEEE80211_SEND_MGMT(ni, 237 IEEE80211_FC0_SUBTYPE_DEAUTH, 238 IEEE80211_REASON_AUTH_LEAVE); 239 break; 240 case IEEE80211_S_SCAN: 241 ieee80211_cancel_scan(vap); 242 break; 243 default: 244 goto invalid; 245 } 246 if (ostate != IEEE80211_S_INIT) { 247 /* NB: optimize INIT -> INIT case */ 248 ieee80211_reset_bss(vap); 249 } 250 if (vap->iv_auth->ia_detach != NULL) 251 vap->iv_auth->ia_detach(vap); 252 break; 253 case IEEE80211_S_SCAN: 254 switch (ostate) { 255 case IEEE80211_S_INIT: 256 /* 257 * Initiate a scan. We can come here as a result 258 * of an IEEE80211_IOC_SCAN_REQ too in which case 259 * the vap will be marked with IEEE80211_FEXT_SCANREQ 260 * and the scan request parameters will be present 261 * in iv_scanreq. Otherwise we do the default. 262 */ 263 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 264 ieee80211_check_scan(vap, 265 vap->iv_scanreq_flags, 266 vap->iv_scanreq_duration, 267 vap->iv_scanreq_mindwell, 268 vap->iv_scanreq_maxdwell, 269 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 270 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 271 } else 272 ieee80211_check_scan_current(vap); 273 break; 274 case IEEE80211_S_SCAN: 275 case IEEE80211_S_AUTH: 276 case IEEE80211_S_ASSOC: 277 /* 278 * These can happen either because of a timeout 279 * on an assoc/auth response or because of a 280 * change in state that requires a reset. For 281 * the former we're called with a non-zero arg 282 * that is the cause for the failure; pass this 283 * to the scan code so it can update state. 284 * Otherwise trigger a new scan unless we're in 285 * manual roaming mode in which case an application 286 * must issue an explicit scan request. 287 */ 288 if (arg != 0) 289 ieee80211_scan_assoc_fail(vap, 290 vap->iv_bss->ni_macaddr, arg); 291 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 292 ieee80211_check_scan_current(vap); 293 break; 294 case IEEE80211_S_SLEEP: /* beacon miss */ 295 /* 296 * XXX if in sleep we need to wakeup the hardware. 297 */ 298 /* FALLTHROUGH */ 299 case IEEE80211_S_RUN: /* beacon miss */ 300 /* 301 * Beacon miss. Notify user space and if not 302 * under control of a user application (roaming 303 * manual) kick off a scan to re-connect. 304 */ 305 306 ieee80211_sta_leave(ni); 307 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 308 ieee80211_check_scan_current(vap); 309 break; 310 default: 311 goto invalid; 312 } 313 break; 314 case IEEE80211_S_AUTH: 315 switch (ostate) { 316 case IEEE80211_S_INIT: 317 case IEEE80211_S_SCAN: 318 IEEE80211_SEND_MGMT(ni, 319 IEEE80211_FC0_SUBTYPE_AUTH, 1); 320 break; 321 case IEEE80211_S_AUTH: 322 case IEEE80211_S_ASSOC: 323 switch (arg & 0xff) { 324 case IEEE80211_FC0_SUBTYPE_AUTH: 325 /* ??? */ 326 IEEE80211_SEND_MGMT(ni, 327 IEEE80211_FC0_SUBTYPE_AUTH, 2); 328 break; 329 case IEEE80211_FC0_SUBTYPE_DEAUTH: 330 sta_authretry(vap, ni, arg>>8); 331 break; 332 } 333 break; 334 case IEEE80211_S_RUN: 335 switch (arg & 0xff) { 336 case IEEE80211_FC0_SUBTYPE_AUTH: 337 IEEE80211_SEND_MGMT(ni, 338 IEEE80211_FC0_SUBTYPE_AUTH, 2); 339 vap->iv_state = ostate; /* stay RUN */ 340 break; 341 case IEEE80211_FC0_SUBTYPE_DEAUTH: 342 ieee80211_sta_leave(ni); 343 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 344 /* try to reauth */ 345 IEEE80211_SEND_MGMT(ni, 346 IEEE80211_FC0_SUBTYPE_AUTH, 1); 347 } 348 break; 349 } 350 break; 351 default: 352 goto invalid; 353 } 354 break; 355 case IEEE80211_S_ASSOC: 356 switch (ostate) { 357 case IEEE80211_S_AUTH: 358 case IEEE80211_S_ASSOC: 359 IEEE80211_SEND_MGMT(ni, 360 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 361 break; 362 case IEEE80211_S_SLEEP: /* cannot happen */ 363 case IEEE80211_S_RUN: 364 ieee80211_sta_leave(ni); 365 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 366 IEEE80211_SEND_MGMT(ni, arg ? 367 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 368 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 369 } 370 break; 371 default: 372 goto invalid; 373 } 374 break; 375 case IEEE80211_S_RUN: 376 if (vap->iv_flags & IEEE80211_F_WPA) { 377 /* XXX validate prerequisites */ 378 } 379 switch (ostate) { 380 case IEEE80211_S_RUN: 381 case IEEE80211_S_CSA: 382 break; 383 case IEEE80211_S_AUTH: /* when join is done in fw */ 384 case IEEE80211_S_ASSOC: 385 #ifdef IEEE80211_DEBUG 386 if (ieee80211_msg_debug(vap)) { 387 ieee80211_note(vap, "%s with %s ssid ", 388 (vap->iv_opmode == IEEE80211_M_STA ? 389 "associated" : "synchronized"), 390 kether_ntoa(ni->ni_bssid, ethstr)); 391 ieee80211_print_essid(vap->iv_bss->ni_essid, 392 ni->ni_esslen); 393 /* XXX MCS/HT */ 394 kprintf(" channel %d start %uMb\n", 395 ieee80211_chan2ieee(ic, ic->ic_curchan), 396 IEEE80211_RATE2MBS(ni->ni_txrate)); 397 } 398 #endif 399 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 400 ieee80211_notify_node_join(ni, 401 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 402 break; 403 case IEEE80211_S_SLEEP: 404 /* Wake up from sleep */ 405 vap->iv_sta_ps(vap, 0); 406 break; 407 default: 408 goto invalid; 409 } 410 ieee80211_sync_curchan(ic); 411 if (ostate != IEEE80211_S_RUN && 412 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 413 /* 414 * Start s/w beacon miss timer for devices w/o 415 * hardware support. We fudge a bit here since 416 * we're doing this in software. 417 */ 418 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 419 2 * vap->iv_bmissthreshold * ni->ni_intval); 420 vap->iv_swbmiss_count = 0; 421 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 422 ieee80211_swbmiss_callout, vap); 423 } 424 /* 425 * When 802.1x is not in use mark the port authorized 426 * at this point so traffic can flow. 427 */ 428 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 429 ieee80211_node_authorize(ni); 430 /* 431 * Fake association when joining an existing bss. 432 * 433 * Don't do this if we're doing SLEEP->RUN. 434 */ 435 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 436 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 437 break; 438 case IEEE80211_S_CSA: 439 if (ostate != IEEE80211_S_RUN) 440 goto invalid; 441 break; 442 case IEEE80211_S_SLEEP: 443 ieee80211_sta_pwrsave(vap, 1); 444 break; 445 default: 446 invalid: 447 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 448 "%s: unexpected state transition %s -> %s\n", __func__, 449 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 450 break; 451 } 452 return 0; 453 } 454 455 /* 456 * Return non-zero if the frame is an echo of a multicast 457 * frame sent by ourself. The dir is known to be DSTODS. 458 */ 459 static __inline int 460 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 461 { 462 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 463 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 464 const uint8_t *sa; 465 466 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 467 468 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 469 return 0; 470 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 471 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 472 #undef WH4 473 #undef QWH4 474 } 475 476 /* 477 * Return non-zero if the frame is an echo of a multicast 478 * frame sent by ourself. The dir is known to be FROMDS. 479 */ 480 static __inline int 481 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 482 { 483 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 484 485 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 486 return 0; 487 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 488 } 489 490 /* 491 * Decide if a received management frame should be 492 * printed when debugging is enabled. This filters some 493 * of the less interesting frames that come frequently 494 * (e.g. beacons). 495 */ 496 static __inline int 497 doprint(struct ieee80211vap *vap, int subtype) 498 { 499 switch (subtype) { 500 case IEEE80211_FC0_SUBTYPE_BEACON: 501 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 502 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 503 return 0; 504 } 505 return 1; 506 } 507 508 /* 509 * Process a received frame. The node associated with the sender 510 * should be supplied. If nothing was found in the node table then 511 * the caller is assumed to supply a reference to iv_bss instead. 512 * The RSSI and a timestamp are also supplied. The RSSI data is used 513 * during AP scanning to select a AP to associate with; it can have 514 * any units so long as values have consistent units and higher values 515 * mean ``better signal''. The receive timestamp is currently not used 516 * by the 802.11 layer. 517 */ 518 static int 519 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 520 { 521 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 522 #define HAS_SEQ(type) ((type & 0x4) == 0) 523 struct ieee80211vap *vap = ni->ni_vap; 524 struct ieee80211com *ic = ni->ni_ic; 525 struct ifnet *ifp = vap->iv_ifp; 526 struct ieee80211_frame *wh; 527 struct ieee80211_key *key; 528 struct ether_header *eh; 529 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 530 uint8_t dir, type, subtype, qos; 531 uint8_t *bssid; 532 uint16_t rxseq; 533 #ifdef IEEE80211_DEBUG 534 char ethstr[ETHER_ADDRSTRLEN + 1]; 535 #endif 536 537 if (m->m_flags & M_AMPDU_MPDU) { 538 /* 539 * Fastpath for A-MPDU reorder q resubmission. Frames 540 * w/ M_AMPDU_MPDU marked have already passed through 541 * here but were received out of order and been held on 542 * the reorder queue. When resubmitted they are marked 543 * with the M_AMPDU_MPDU flag and we can bypass most of 544 * the normal processing. 545 */ 546 wh = mtod(m, struct ieee80211_frame *); 547 type = IEEE80211_FC0_TYPE_DATA; 548 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 549 subtype = IEEE80211_FC0_SUBTYPE_QOS; 550 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 551 goto resubmit_ampdu; 552 } 553 554 KASSERT(ni != NULL, ("null node")); 555 ni->ni_inact = ni->ni_inact_reload; 556 557 type = -1; /* undefined */ 558 559 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 560 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 561 ni->ni_macaddr, NULL, 562 "too short (1): len %u", m->m_pkthdr.len); 563 vap->iv_stats.is_rx_tooshort++; 564 goto out; 565 } 566 /* 567 * Bit of a cheat here, we use a pointer for a 3-address 568 * frame format but don't reference fields past outside 569 * ieee80211_frame_min w/o first validating the data is 570 * present. 571 */ 572 wh = mtod(m, struct ieee80211_frame *); 573 574 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 575 IEEE80211_FC0_VERSION_0) { 576 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 577 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 578 wh->i_fc[0], wh->i_fc[1]); 579 vap->iv_stats.is_rx_badversion++; 580 goto err; 581 } 582 583 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 584 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 585 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 586 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 587 bssid = wh->i_addr2; 588 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 589 /* not interested in */ 590 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 591 bssid, NULL, "%s", "not to bss"); 592 vap->iv_stats.is_rx_wrongbss++; 593 goto out; 594 } 595 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 596 ni->ni_noise = nf; 597 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 598 uint8_t tid = ieee80211_gettid(wh); 599 if (IEEE80211_QOS_HAS_SEQ(wh) && 600 TID_TO_WME_AC(tid) >= WME_AC_VI) 601 ic->ic_wme.wme_hipri_traffic++; 602 rxseq = le16toh(*(uint16_t *)wh->i_seq); 603 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 604 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 605 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 606 /* duplicate, discard */ 607 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 608 bssid, "duplicate", 609 "seqno <%u,%u> fragno <%u,%u> tid %u", 610 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 611 ni->ni_rxseqs[tid] >> 612 IEEE80211_SEQ_SEQ_SHIFT, 613 rxseq & IEEE80211_SEQ_FRAG_MASK, 614 ni->ni_rxseqs[tid] & 615 IEEE80211_SEQ_FRAG_MASK, 616 tid); 617 vap->iv_stats.is_rx_dup++; 618 IEEE80211_NODE_STAT(ni, rx_dup); 619 goto out; 620 } 621 ni->ni_rxseqs[tid] = rxseq; 622 } 623 } 624 625 switch (type) { 626 case IEEE80211_FC0_TYPE_DATA: 627 hdrspace = ieee80211_hdrspace(ic, wh); 628 if (m->m_len < hdrspace && 629 (m = m_pullup(m, hdrspace)) == NULL) { 630 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 631 ni->ni_macaddr, NULL, 632 "data too short: expecting %u", hdrspace); 633 vap->iv_stats.is_rx_tooshort++; 634 goto out; /* XXX */ 635 } 636 /* 637 * Handle A-MPDU re-ordering. If the frame is to be 638 * processed directly then ieee80211_ampdu_reorder 639 * will return 0; otherwise it has consumed the mbuf 640 * and we should do nothing more with it. 641 */ 642 if ((m->m_flags & M_AMPDU) && 643 (dir == IEEE80211_FC1_DIR_FROMDS || 644 dir == IEEE80211_FC1_DIR_DSTODS) && 645 ieee80211_ampdu_reorder(ni, m) != 0) { 646 m = NULL; 647 goto out; 648 } 649 resubmit_ampdu: 650 if (dir == IEEE80211_FC1_DIR_FROMDS) { 651 if ((ifp->if_flags & IFF_SIMPLEX) && 652 isfromds_mcastecho(vap, wh)) { 653 /* 654 * In IEEE802.11 network, multicast 655 * packets sent from "me" are broadcast 656 * from the AP; silently discard for 657 * SIMPLEX interface. 658 */ 659 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 660 wh, "data", "%s", "multicast echo"); 661 vap->iv_stats.is_rx_mcastecho++; 662 goto out; 663 } 664 if ((vap->iv_flags & IEEE80211_F_DWDS) && 665 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 666 /* 667 * DWDS sta's must drop 3-address mcast frames 668 * as they will be sent separately as a 4-addr 669 * frame. Accepting the 3-addr frame will 670 * confuse the bridge into thinking the sending 671 * sta is located at the end of WDS link. 672 */ 673 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 674 "3-address data", "%s", "DWDS enabled"); 675 vap->iv_stats.is_rx_mcastecho++; 676 goto out; 677 } 678 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 679 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 680 IEEE80211_DISCARD(vap, 681 IEEE80211_MSG_INPUT, wh, "4-address data", 682 "%s", "DWDS not enabled"); 683 vap->iv_stats.is_rx_wrongdir++; 684 goto out; 685 } 686 if ((ifp->if_flags & IFF_SIMPLEX) && 687 isdstods_mcastecho(vap, wh)) { 688 /* 689 * In IEEE802.11 network, multicast 690 * packets sent from "me" are broadcast 691 * from the AP; silently discard for 692 * SIMPLEX interface. 693 */ 694 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 695 "4-address data", "%s", "multicast echo"); 696 vap->iv_stats.is_rx_mcastecho++; 697 goto out; 698 } 699 } else { 700 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 701 "data", "incorrect dir 0x%x", dir); 702 vap->iv_stats.is_rx_wrongdir++; 703 goto out; 704 } 705 706 /* 707 * Handle privacy requirements. Note that we 708 * must not be preempted from here until after 709 * we (potentially) call ieee80211_crypto_demic; 710 * otherwise we may violate assumptions in the 711 * crypto cipher modules used to do delayed update 712 * of replay sequence numbers. 713 */ 714 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 715 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 716 /* 717 * Discard encrypted frames when privacy is off. 718 */ 719 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 720 wh, "WEP", "%s", "PRIVACY off"); 721 vap->iv_stats.is_rx_noprivacy++; 722 IEEE80211_NODE_STAT(ni, rx_noprivacy); 723 goto out; 724 } 725 key = ieee80211_crypto_decap(ni, m, hdrspace); 726 if (key == NULL) { 727 /* NB: stats+msgs handled in crypto_decap */ 728 IEEE80211_NODE_STAT(ni, rx_wepfail); 729 goto out; 730 } 731 wh = mtod(m, struct ieee80211_frame *); 732 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 733 } else { 734 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 735 key = NULL; 736 } 737 738 /* 739 * Save QoS bits for use below--before we strip the header. 740 */ 741 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 742 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 743 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 744 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 745 } else 746 qos = 0; 747 748 /* 749 * Next up, any fragmentation. 750 */ 751 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 752 m = ieee80211_defrag(ni, m, hdrspace); 753 if (m == NULL) { 754 /* Fragment dropped or frame not complete yet */ 755 goto out; 756 } 757 } 758 wh = NULL; /* no longer valid, catch any uses */ 759 760 /* 761 * Next strip any MSDU crypto bits. 762 */ 763 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 765 ni->ni_macaddr, "data", "%s", "demic error"); 766 vap->iv_stats.is_rx_demicfail++; 767 IEEE80211_NODE_STAT(ni, rx_demicfail); 768 goto out; 769 } 770 771 /* copy to listener after decrypt */ 772 if (ieee80211_radiotap_active_vap(vap)) 773 ieee80211_radiotap_rx(vap, m); 774 need_tap = 0; 775 776 /* 777 * Finally, strip the 802.11 header. 778 */ 779 m = ieee80211_decap(vap, m, hdrspace); 780 if (m == NULL) { 781 /* XXX mask bit to check for both */ 782 /* don't count Null data frames as errors */ 783 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 784 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 785 goto out; 786 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 787 ni->ni_macaddr, "data", "%s", "decap error"); 788 vap->iv_stats.is_rx_decap++; 789 IEEE80211_NODE_STAT(ni, rx_decap); 790 goto err; 791 } 792 eh = mtod(m, struct ether_header *); 793 if (!ieee80211_node_is_authorized(ni)) { 794 /* 795 * Deny any non-PAE frames received prior to 796 * authorization. For open/shared-key 797 * authentication the port is mark authorized 798 * after authentication completes. For 802.1x 799 * the port is not marked authorized by the 800 * authenticator until the handshake has completed. 801 */ 802 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 803 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 804 eh->ether_shost, "data", 805 "unauthorized port: ether type 0x%x len %u", 806 eh->ether_type, m->m_pkthdr.len); 807 vap->iv_stats.is_rx_unauth++; 808 IEEE80211_NODE_STAT(ni, rx_unauth); 809 goto err; 810 } 811 } else { 812 /* 813 * When denying unencrypted frames, discard 814 * any non-PAE frames received without encryption. 815 */ 816 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 817 (key == NULL && (m->m_flags & M_WEP) == 0) && 818 eh->ether_type != htons(ETHERTYPE_PAE)) { 819 /* 820 * Drop unencrypted frames. 821 */ 822 vap->iv_stats.is_rx_unencrypted++; 823 IEEE80211_NODE_STAT(ni, rx_unencrypted); 824 goto out; 825 } 826 } 827 /* XXX require HT? */ 828 if (qos & IEEE80211_QOS_AMSDU) { 829 m = ieee80211_decap_amsdu(ni, m); 830 if (m == NULL) 831 return IEEE80211_FC0_TYPE_DATA; 832 } else { 833 #ifdef IEEE80211_SUPPORT_SUPERG 834 m = ieee80211_decap_fastframe(vap, ni, m); 835 if (m == NULL) 836 return IEEE80211_FC0_TYPE_DATA; 837 #endif 838 } 839 ieee80211_deliver_data(vap, ni, m); 840 return IEEE80211_FC0_TYPE_DATA; 841 842 case IEEE80211_FC0_TYPE_MGT: 843 vap->iv_stats.is_rx_mgmt++; 844 IEEE80211_NODE_STAT(ni, rx_mgmt); 845 if (dir != IEEE80211_FC1_DIR_NODS) { 846 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 847 wh, "data", "incorrect dir 0x%x", dir); 848 vap->iv_stats.is_rx_wrongdir++; 849 goto err; 850 } 851 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 852 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 853 ni->ni_macaddr, "mgt", "too short: len %u", 854 m->m_pkthdr.len); 855 vap->iv_stats.is_rx_tooshort++; 856 goto out; 857 } 858 #ifdef IEEE80211_DEBUG 859 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 860 ieee80211_msg_dumppkts(vap)) { 861 if_printf(ifp, "received %s from %s rssi %d\n", 862 ieee80211_mgt_subtype_name[subtype >> 863 IEEE80211_FC0_SUBTYPE_SHIFT], 864 kether_ntoa(wh->i_addr2, ethstr), rssi); 865 } 866 #endif 867 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 868 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 869 /* 870 * Only shared key auth frames with a challenge 871 * should be encrypted, discard all others. 872 */ 873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 874 wh, ieee80211_mgt_subtype_name[subtype >> 875 IEEE80211_FC0_SUBTYPE_SHIFT], 876 "%s", "WEP set but not permitted"); 877 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 878 goto out; 879 } 880 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 881 /* 882 * Discard encrypted frames when privacy is off. 883 */ 884 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 885 wh, "mgt", "%s", "WEP set but PRIVACY off"); 886 vap->iv_stats.is_rx_noprivacy++; 887 goto out; 888 } 889 hdrspace = ieee80211_hdrspace(ic, wh); 890 key = ieee80211_crypto_decap(ni, m, hdrspace); 891 if (key == NULL) { 892 /* NB: stats+msgs handled in crypto_decap */ 893 goto out; 894 } 895 wh = mtod(m, struct ieee80211_frame *); 896 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 897 } 898 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 899 goto out; 900 901 case IEEE80211_FC0_TYPE_CTL: 902 vap->iv_stats.is_rx_ctl++; 903 IEEE80211_NODE_STAT(ni, rx_ctrl); 904 vap->iv_recv_ctl(ni, m, subtype); 905 goto out; 906 907 default: 908 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 909 wh, NULL, "bad frame type 0x%x", type); 910 /* should not come here */ 911 break; 912 } 913 err: 914 IFNET_STAT_INC(ifp, ierrors, 1); 915 out: 916 if (m != NULL) { 917 if (need_tap && ieee80211_radiotap_active_vap(vap)) 918 ieee80211_radiotap_rx(vap, m); 919 m_freem(m); 920 } 921 return type; 922 #undef SEQ_LEQ 923 } 924 925 static void 926 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 927 int rssi, int nf, uint16_t seq, uint16_t status) 928 { 929 struct ieee80211vap *vap = ni->ni_vap; 930 931 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 932 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 933 ni->ni_macaddr, "open auth", 934 "bad sta auth mode %u", ni->ni_authmode); 935 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 936 return; 937 } 938 if (vap->iv_state != IEEE80211_S_AUTH || 939 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 940 vap->iv_stats.is_rx_bad_auth++; 941 return; 942 } 943 if (status != 0) { 944 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 945 ni, "open auth failed (reason %d)", status); 946 vap->iv_stats.is_rx_auth_fail++; 947 vap->iv_stats.is_rx_authfail_code = status; 948 ieee80211_new_state(vap, IEEE80211_S_SCAN, 949 IEEE80211_SCAN_FAIL_STATUS); 950 } else 951 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 952 } 953 954 static void 955 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 956 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 957 uint16_t seq, uint16_t status) 958 { 959 struct ieee80211vap *vap = ni->ni_vap; 960 uint8_t *challenge; 961 962 /* 963 * NB: this can happen as we allow pre-shared key 964 * authentication to be enabled w/o wep being turned 965 * on so that configuration of these can be done 966 * in any order. It may be better to enforce the 967 * ordering in which case this check would just be 968 * for sanity/consistency. 969 */ 970 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 971 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 972 ni->ni_macaddr, "shared key auth", 973 "%s", " PRIVACY is disabled"); 974 goto bad; 975 } 976 /* 977 * Pre-shared key authentication is evil; accept 978 * it only if explicitly configured (it is supported 979 * mainly for compatibility with clients like OS X). 980 */ 981 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 982 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 983 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 984 ni->ni_macaddr, "shared key auth", 985 "bad sta auth mode %u", ni->ni_authmode); 986 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 987 goto bad; 988 } 989 990 challenge = NULL; 991 if (frm + 1 < efrm) { 992 if ((frm[1] + 2) > (efrm - frm)) { 993 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 994 ni->ni_macaddr, "shared key auth", 995 "ie %d/%d too long", 996 frm[0], (int)((frm[1] + 2) - (efrm - frm))); 997 vap->iv_stats.is_rx_bad_auth++; 998 goto bad; 999 } 1000 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1001 challenge = frm; 1002 frm += frm[1] + 2; 1003 } 1004 switch (seq) { 1005 case IEEE80211_AUTH_SHARED_CHALLENGE: 1006 case IEEE80211_AUTH_SHARED_RESPONSE: 1007 if (challenge == NULL) { 1008 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1009 ni->ni_macaddr, "shared key auth", 1010 "%s", "no challenge"); 1011 vap->iv_stats.is_rx_bad_auth++; 1012 goto bad; 1013 } 1014 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1015 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1016 ni->ni_macaddr, "shared key auth", 1017 "bad challenge len %d", challenge[1]); 1018 vap->iv_stats.is_rx_bad_auth++; 1019 goto bad; 1020 } 1021 default: 1022 break; 1023 } 1024 if (vap->iv_state != IEEE80211_S_AUTH) 1025 return; 1026 switch (seq) { 1027 case IEEE80211_AUTH_SHARED_PASS: 1028 if (ni->ni_challenge != NULL) { 1029 kfree(ni->ni_challenge, M_80211_NODE); 1030 ni->ni_challenge = NULL; 1031 } 1032 if (status != 0) { 1033 IEEE80211_NOTE_FRAME(vap, 1034 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1035 "shared key auth failed (reason %d)", status); 1036 vap->iv_stats.is_rx_auth_fail++; 1037 vap->iv_stats.is_rx_authfail_code = status; 1038 return; 1039 } 1040 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1041 break; 1042 case IEEE80211_AUTH_SHARED_CHALLENGE: 1043 if (!ieee80211_alloc_challenge(ni)) 1044 return; 1045 /* XXX could optimize by passing recvd challenge */ 1046 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1047 IEEE80211_SEND_MGMT(ni, 1048 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1049 break; 1050 default: 1051 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1052 wh, "shared key auth", "bad seq %d", seq); 1053 vap->iv_stats.is_rx_bad_auth++; 1054 return; 1055 } 1056 return; 1057 bad: 1058 /* 1059 * Kick the state machine. This short-circuits 1060 * using the mgt frame timeout to trigger the 1061 * state transition. 1062 */ 1063 if (vap->iv_state == IEEE80211_S_AUTH) 1064 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1065 IEEE80211_SCAN_FAIL_STATUS); 1066 } 1067 1068 static int 1069 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1070 const struct ieee80211_frame *wh) 1071 { 1072 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1073 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1074 u_int len = frm[1], qosinfo; 1075 int i; 1076 1077 if (len < sizeof(struct ieee80211_wme_param)-2) { 1078 IEEE80211_DISCARD_IE(vap, 1079 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1080 wh, "WME", "too short, len %u", len); 1081 return -1; 1082 } 1083 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1084 qosinfo &= WME_QOSINFO_COUNT; 1085 /* XXX do proper check for wraparound */ 1086 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1087 return 0; 1088 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1089 for (i = 0; i < WME_NUM_AC; i++) { 1090 struct wmeParams *wmep = 1091 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1092 /* NB: ACI not used */ 1093 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1094 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1095 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1096 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1097 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1098 frm += 4; 1099 } 1100 wme->wme_wmeChanParams.cap_info = qosinfo; 1101 return 1; 1102 #undef MS 1103 } 1104 1105 /* 1106 * Process 11h Channel Switch Announcement (CSA) ie. If this 1107 * is the first CSA then initiate the switch. Otherwise we 1108 * track state and trigger completion and/or cancel of the switch. 1109 * XXX should be public for IBSS use 1110 */ 1111 static void 1112 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1113 const struct ieee80211_frame *wh) 1114 { 1115 struct ieee80211com *ic = vap->iv_ic; 1116 const struct ieee80211_csa_ie *csa = 1117 (const struct ieee80211_csa_ie *) frm; 1118 1119 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1120 ("state %s", ieee80211_state_name[vap->iv_state])); 1121 1122 if (csa->csa_mode > 1) { 1123 IEEE80211_DISCARD_IE(vap, 1124 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1125 wh, "CSA", "invalid mode %u", csa->csa_mode); 1126 return; 1127 } 1128 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1129 /* 1130 * Convert the channel number to a channel reference. We 1131 * try first to preserve turbo attribute of the current 1132 * channel then fallback. Note this will not work if the 1133 * CSA specifies a channel that requires a band switch (e.g. 1134 * 11a => 11g). This is intentional as 11h is defined only 1135 * for 5GHz/11a and because the switch does not involve a 1136 * reassociation, protocol state (capabilities, negotated 1137 * rates, etc) may/will be wrong. 1138 */ 1139 struct ieee80211_channel *c = 1140 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1141 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1142 if (c == NULL) { 1143 c = ieee80211_find_channel_byieee(ic, 1144 csa->csa_newchan, 1145 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1146 if (c == NULL) { 1147 IEEE80211_DISCARD_IE(vap, 1148 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1149 wh, "CSA", "invalid channel %u", 1150 csa->csa_newchan); 1151 goto done; 1152 } 1153 } 1154 #if IEEE80211_CSA_COUNT_MIN > 0 1155 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1156 /* 1157 * Require at least IEEE80211_CSA_COUNT_MIN count to 1158 * reduce the risk of being redirected by a fabricated 1159 * CSA. If a valid CSA is dropped we'll still get a 1160 * beacon miss when the AP leaves the channel so we'll 1161 * eventually follow to the new channel. 1162 * 1163 * NOTE: this violates the 11h spec that states that 1164 * count may be any value and if 0 then a switch 1165 * should happen asap. 1166 */ 1167 IEEE80211_DISCARD_IE(vap, 1168 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1169 wh, "CSA", "count %u too small, must be >= %u", 1170 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1171 goto done; 1172 } 1173 #endif 1174 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1175 } else { 1176 /* 1177 * Validate this ie against the initial CSA. We require 1178 * mode and channel not change and the count must be 1179 * monotonically decreasing. This may be pointless and 1180 * canceling the switch as a result may be too paranoid but 1181 * in the worst case if we drop out of CSA because of this 1182 * and the AP does move then we'll just end up taking a 1183 * beacon miss and scan to find the AP. 1184 * 1185 * XXX may want <= on count as we also process ProbeResp 1186 * frames and those may come in w/ the same count as the 1187 * previous beacon; but doing so leaves us open to a stuck 1188 * count until we add a dead-man timer 1189 */ 1190 if (!(csa->csa_count < ic->ic_csa_count && 1191 csa->csa_mode == ic->ic_csa_mode && 1192 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1193 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1194 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1195 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1196 ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count, 1197 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1198 ieee80211_csa_cancelswitch(ic); 1199 } else { 1200 if (csa->csa_count <= 1) 1201 ieee80211_csa_completeswitch(ic); 1202 else 1203 ic->ic_csa_count = csa->csa_count; 1204 } 1205 } 1206 done: 1207 ; 1208 } 1209 1210 /* 1211 * Return non-zero if a background scan may be continued: 1212 * o bg scan is active 1213 * o no channel switch is pending 1214 * o there has not been any traffic recently 1215 * 1216 * Note we do not check if there is an administrative enable; 1217 * this is only done to start the scan. We assume that any 1218 * change in state will be accompanied by a request to cancel 1219 * active scans which will otherwise cause this test to fail. 1220 */ 1221 static __inline int 1222 contbgscan(struct ieee80211vap *vap) 1223 { 1224 struct ieee80211com *ic = vap->iv_ic; 1225 1226 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1227 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1228 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1229 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1230 } 1231 1232 /* 1233 * Return non-zero if a backgrond scan may be started: 1234 * o bg scanning is administratively enabled 1235 * o no channel switch is pending 1236 * o we are not boosted on a dynamic turbo channel 1237 * o there has not been a scan recently 1238 * o there has not been any traffic recently 1239 */ 1240 static __inline int 1241 startbgscan(struct ieee80211vap *vap) 1242 { 1243 struct ieee80211com *ic = vap->iv_ic; 1244 1245 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1246 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1247 #ifdef IEEE80211_SUPPORT_SUPERG 1248 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1249 #endif 1250 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1251 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1252 } 1253 1254 static void 1255 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1256 int subtype, int rssi, int nf) 1257 { 1258 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1259 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1260 struct ieee80211vap *vap = ni->ni_vap; 1261 struct ieee80211com *ic = ni->ni_ic; 1262 struct ieee80211_frame *wh; 1263 uint8_t *frm, *efrm; 1264 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1265 uint8_t rate; 1266 1267 wh = mtod(m0, struct ieee80211_frame *); 1268 frm = (uint8_t *)&wh[1]; 1269 efrm = mtod(m0, uint8_t *) + m0->m_len; 1270 switch (subtype) { 1271 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1272 case IEEE80211_FC0_SUBTYPE_BEACON: { 1273 struct ieee80211_scanparams scan; 1274 /* 1275 * We process beacon/probe response frames: 1276 * o when scanning, or 1277 * o station mode when associated (to collect state 1278 * updates such as 802.11g slot time) 1279 * Frames otherwise received are discarded. 1280 */ 1281 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1282 vap->iv_stats.is_rx_mgtdiscard++; 1283 return; 1284 } 1285 /* XXX probe response in sta mode when !scanning? */ 1286 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1287 return; 1288 /* 1289 * Count frame now that we know it's to be processed. 1290 */ 1291 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1292 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1293 IEEE80211_NODE_STAT(ni, rx_beacons); 1294 } else 1295 IEEE80211_NODE_STAT(ni, rx_proberesp); 1296 /* 1297 * When operating in station mode, check for state updates. 1298 * Be careful to ignore beacons received while doing a 1299 * background scan. We consider only 11g/WMM stuff right now. 1300 */ 1301 if (ni->ni_associd != 0 && 1302 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1303 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1304 /* record tsf of last beacon */ 1305 memcpy(ni->ni_tstamp.data, scan.tstamp, 1306 sizeof(ni->ni_tstamp)); 1307 /* count beacon frame for s/w bmiss handling */ 1308 vap->iv_swbmiss_count++; 1309 vap->iv_bmiss_count = 0; 1310 if (ni->ni_erp != scan.erp) { 1311 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1312 wh->i_addr2, 1313 "erp change: was 0x%x, now 0x%x", 1314 ni->ni_erp, scan.erp); 1315 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1316 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1317 ic->ic_flags |= IEEE80211_F_USEPROT; 1318 else 1319 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1320 ni->ni_erp = scan.erp; 1321 /* XXX statistic */ 1322 /* XXX driver notification */ 1323 } 1324 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1325 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1326 wh->i_addr2, 1327 "capabilities change: was 0x%x, now 0x%x", 1328 ni->ni_capinfo, scan.capinfo); 1329 /* 1330 * NB: we assume short preamble doesn't 1331 * change dynamically 1332 */ 1333 ieee80211_set_shortslottime(ic, 1334 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1335 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1336 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1337 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1338 /* XXX statistic */ 1339 } 1340 if (scan.wme != NULL && 1341 (ni->ni_flags & IEEE80211_NODE_QOS) && 1342 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1343 ieee80211_wme_updateparams(vap); 1344 #ifdef IEEE80211_SUPPORT_SUPERG 1345 if (scan.ath != NULL) 1346 ieee80211_parse_athparams(ni, scan.ath, wh); 1347 #endif 1348 if (scan.htcap != NULL && scan.htinfo != NULL && 1349 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1350 ieee80211_ht_updateparams(ni, 1351 scan.htcap, scan.htinfo); 1352 /* XXX state changes? */ 1353 } 1354 1355 if (scan.tim != NULL) { 1356 struct ieee80211_tim_ie *tim = 1357 (struct ieee80211_tim_ie *) scan.tim; 1358 /* 1359 * XXX Check/debug this code; see if it's about 1360 * the right time to force the VAP awake if we 1361 * receive a frame destined for us? 1362 */ 1363 int aid = IEEE80211_AID(ni->ni_associd); 1364 int ix = aid / NBBY; 1365 int min = tim->tim_bitctl &~ 1; 1366 int max = tim->tim_len + min - 4; 1367 1368 /* 1369 * Only do this for unicast traffic in the TIM 1370 * The multicast traffic notification for 1371 * the scan notification stuff should occur 1372 * differently. 1373 */ 1374 if (min <= ix && ix <= max && 1375 isset(tim->tim_bitmap - min, aid)) { 1376 ieee80211_sta_tim_notify(vap, 1); 1377 ic->ic_lastdata = ticks; 1378 } 1379 1380 /* 1381 * XXX TODO: do a separate notification 1382 * for the multicast bit being set. 1383 */ 1384 #if 0 1385 if (tim->tim_bitctl & 1) { 1386 ieee80211_sta_tim_notify(vap, 1); 1387 ic->ic_lastdata = ticks; 1388 } 1389 #endif 1390 ni->ni_dtim_count = tim->tim_count; 1391 ni->ni_dtim_period = tim->tim_period; 1392 } 1393 if (scan.csa != NULL && 1394 (vap->iv_flags & IEEE80211_F_DOTH)) 1395 ieee80211_parse_csaparams(vap, scan.csa, wh); 1396 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1397 /* 1398 * No CSA ie or 11h disabled, but a channel 1399 * switch is pending; drop out so we aren't 1400 * stuck in CSA state. If the AP really is 1401 * moving we'll get a beacon miss and scan. 1402 */ 1403 ieee80211_csa_cancelswitch(ic); 1404 } 1405 /* 1406 * If scanning, pass the info to the scan module. 1407 * Otherwise, check if it's the right time to do 1408 * a background scan. Background scanning must 1409 * be enabled and we must not be operating in the 1410 * turbo phase of dynamic turbo mode. Then, 1411 * it's been a while since the last background 1412 * scan and if no data frames have come through 1413 * recently, kick off a scan. Note that this 1414 * is the mechanism by which a background scan 1415 * is started _and_ continued each time we 1416 * return on-channel to receive a beacon from 1417 * our ap. 1418 */ 1419 if (ic->ic_flags & IEEE80211_F_SCAN) { 1420 ieee80211_add_scan(vap, &scan, wh, 1421 subtype, rssi, nf); 1422 } else if (contbgscan(vap)) { 1423 ieee80211_bg_scan(vap, 0); 1424 } else if (startbgscan(vap)) { 1425 vap->iv_stats.is_scan_bg++; 1426 #if 0 1427 /* wakeup if we are sleeing */ 1428 ieee80211_set_pwrsave(vap, 0); 1429 #endif 1430 ieee80211_bg_scan(vap, 0); 1431 } 1432 1433 /* 1434 * Put the station to sleep if we haven't seen 1435 * traffic in a while. 1436 */ 1437 ieee80211_sta_ps_timer_check(vap); 1438 1439 return; 1440 } 1441 1442 /* 1443 * If scanning, just pass information to the scan module. 1444 */ 1445 if (ic->ic_flags & IEEE80211_F_SCAN) { 1446 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1447 /* 1448 * Actively scanning a channel marked passive; 1449 * send a probe request now that we know there 1450 * is 802.11 traffic present. 1451 * 1452 * XXX check if the beacon we recv'd gives 1453 * us what we need and suppress the probe req 1454 */ 1455 ieee80211_probe_curchan(vap, 1); 1456 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1457 } 1458 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1459 return; 1460 } 1461 break; 1462 } 1463 1464 case IEEE80211_FC0_SUBTYPE_AUTH: { 1465 uint16_t algo, seq, status; 1466 /* 1467 * auth frame format 1468 * [2] algorithm 1469 * [2] sequence 1470 * [2] status 1471 * [tlv*] challenge 1472 */ 1473 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1474 algo = le16toh(*(uint16_t *)frm); 1475 seq = le16toh(*(uint16_t *)(frm + 2)); 1476 status = le16toh(*(uint16_t *)(frm + 4)); 1477 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1478 "recv auth frame with algorithm %d seq %d", algo, seq); 1479 1480 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1481 IEEE80211_DISCARD(vap, 1482 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1483 wh, "auth", "%s", "TKIP countermeasures enabled"); 1484 vap->iv_stats.is_rx_auth_countermeasures++; 1485 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1486 ieee80211_send_error(ni, wh->i_addr2, 1487 IEEE80211_FC0_SUBTYPE_AUTH, 1488 IEEE80211_REASON_MIC_FAILURE); 1489 } 1490 return; 1491 } 1492 if (algo == IEEE80211_AUTH_ALG_SHARED) 1493 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1494 seq, status); 1495 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1496 sta_auth_open(ni, wh, rssi, nf, seq, status); 1497 else { 1498 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1499 wh, "auth", "unsupported alg %d", algo); 1500 vap->iv_stats.is_rx_auth_unsupported++; 1501 return; 1502 } 1503 break; 1504 } 1505 1506 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1507 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1508 uint16_t capinfo, associd; 1509 uint16_t status; 1510 1511 if (vap->iv_state != IEEE80211_S_ASSOC) { 1512 vap->iv_stats.is_rx_mgtdiscard++; 1513 return; 1514 } 1515 1516 /* 1517 * asresp frame format 1518 * [2] capability information 1519 * [2] status 1520 * [2] association ID 1521 * [tlv] supported rates 1522 * [tlv] extended supported rates 1523 * [tlv] WME 1524 * [tlv] HT capabilities 1525 * [tlv] HT info 1526 */ 1527 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1528 ni = vap->iv_bss; 1529 capinfo = le16toh(*(uint16_t *)frm); 1530 frm += 2; 1531 status = le16toh(*(uint16_t *)frm); 1532 frm += 2; 1533 if (status != 0) { 1534 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1535 wh->i_addr2, "%sassoc failed (reason %d)", 1536 ISREASSOC(subtype) ? "re" : "", status); 1537 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1538 return; 1539 } 1540 associd = le16toh(*(uint16_t *)frm); 1541 frm += 2; 1542 1543 rates = xrates = wme = htcap = htinfo = NULL; 1544 while (efrm - frm > 1) { 1545 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1546 switch (*frm) { 1547 case IEEE80211_ELEMID_RATES: 1548 rates = frm; 1549 break; 1550 case IEEE80211_ELEMID_XRATES: 1551 xrates = frm; 1552 break; 1553 case IEEE80211_ELEMID_HTCAP: 1554 htcap = frm; 1555 break; 1556 case IEEE80211_ELEMID_HTINFO: 1557 htinfo = frm; 1558 break; 1559 case IEEE80211_ELEMID_VENDOR: 1560 if (iswmeoui(frm)) 1561 wme = frm; 1562 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1563 /* 1564 * Accept pre-draft HT ie's if the 1565 * standard ones have not been seen. 1566 */ 1567 if (ishtcapoui(frm)) { 1568 if (htcap == NULL) 1569 htcap = frm; 1570 } else if (ishtinfooui(frm)) { 1571 if (htinfo == NULL) 1572 htcap = frm; 1573 } 1574 } 1575 /* XXX Atheros OUI support */ 1576 break; 1577 } 1578 frm += frm[1] + 2; 1579 } 1580 1581 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1582 if (xrates != NULL) 1583 IEEE80211_VERIFY_ELEMENT(xrates, 1584 IEEE80211_RATE_MAXSIZE - rates[1], return); 1585 rate = ieee80211_setup_rates(ni, rates, xrates, 1586 IEEE80211_F_JOIN | 1587 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1588 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1589 if (rate & IEEE80211_RATE_BASIC) { 1590 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1591 wh->i_addr2, 1592 "%sassoc failed (rate set mismatch)", 1593 ISREASSOC(subtype) ? "re" : ""); 1594 vap->iv_stats.is_rx_assoc_norate++; 1595 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1596 IEEE80211_SCAN_FAIL_STATUS); 1597 return; 1598 } 1599 1600 ni->ni_capinfo = capinfo; 1601 ni->ni_associd = associd; 1602 if (ni->ni_jointime == 0) 1603 ni->ni_jointime = time_uptime; 1604 if (wme != NULL && 1605 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1606 ni->ni_flags |= IEEE80211_NODE_QOS; 1607 ieee80211_wme_updateparams(vap); 1608 } else 1609 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1610 /* 1611 * Setup HT state according to the negotiation. 1612 * 1613 * NB: shouldn't need to check if HT use is enabled but some 1614 * ap's send back HT ie's even when we don't indicate we 1615 * are HT capable in our AssocReq. 1616 */ 1617 if (htcap != NULL && htinfo != NULL && 1618 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1619 ieee80211_ht_node_init(ni); 1620 ieee80211_ht_updateparams(ni, htcap, htinfo); 1621 ieee80211_setup_htrates(ni, htcap, 1622 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1623 ieee80211_setup_basic_htrates(ni, htinfo); 1624 ieee80211_node_setuptxparms(ni); 1625 ieee80211_ratectl_node_init(ni); 1626 } else { 1627 #ifdef IEEE80211_SUPPORT_SUPERG 1628 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1629 ieee80211_ff_node_init(ni); 1630 #endif 1631 } 1632 /* 1633 * Configure state now that we are associated. 1634 * 1635 * XXX may need different/additional driver callbacks? 1636 */ 1637 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1638 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1639 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1640 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1641 } else { 1642 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1643 ic->ic_flags |= IEEE80211_F_USEBARKER; 1644 } 1645 ieee80211_set_shortslottime(ic, 1646 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1647 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1648 /* 1649 * Honor ERP protection. 1650 * 1651 * NB: ni_erp should zero for non-11g operation. 1652 */ 1653 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1654 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1655 ic->ic_flags |= IEEE80211_F_USEPROT; 1656 else 1657 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1658 IEEE80211_NOTE_MAC(vap, 1659 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1660 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1661 ISREASSOC(subtype) ? "re" : "", 1662 IEEE80211_NODE_AID(ni), 1663 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1664 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1665 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1666 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1667 ni->ni_flags & IEEE80211_NODE_HT ? 1668 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1669 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1670 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1671 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1672 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1673 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1674 ", fast-frames" : "", 1675 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1676 ", turbo" : "" 1677 ); 1678 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1679 break; 1680 } 1681 1682 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1683 uint16_t reason; 1684 1685 if (vap->iv_state == IEEE80211_S_SCAN) { 1686 vap->iv_stats.is_rx_mgtdiscard++; 1687 return; 1688 } 1689 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1690 /* NB: can happen when in promiscuous mode */ 1691 vap->iv_stats.is_rx_mgtdiscard++; 1692 break; 1693 } 1694 1695 /* 1696 * deauth frame format 1697 * [2] reason 1698 */ 1699 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1700 reason = le16toh(*(uint16_t *)frm); 1701 1702 vap->iv_stats.is_rx_deauth++; 1703 vap->iv_stats.is_rx_deauth_code = reason; 1704 IEEE80211_NODE_STAT(ni, rx_deauth); 1705 1706 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1707 "recv deauthenticate (reason %d)", reason); 1708 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1709 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1710 break; 1711 } 1712 1713 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1714 uint16_t reason; 1715 1716 if (vap->iv_state != IEEE80211_S_RUN && 1717 vap->iv_state != IEEE80211_S_ASSOC && 1718 vap->iv_state != IEEE80211_S_AUTH) { 1719 vap->iv_stats.is_rx_mgtdiscard++; 1720 return; 1721 } 1722 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1723 /* NB: can happen when in promiscuous mode */ 1724 vap->iv_stats.is_rx_mgtdiscard++; 1725 break; 1726 } 1727 1728 /* 1729 * disassoc frame format 1730 * [2] reason 1731 */ 1732 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1733 reason = le16toh(*(uint16_t *)frm); 1734 1735 vap->iv_stats.is_rx_disassoc++; 1736 vap->iv_stats.is_rx_disassoc_code = reason; 1737 IEEE80211_NODE_STAT(ni, rx_disassoc); 1738 1739 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1740 "recv disassociate (reason %d)", reason); 1741 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1742 break; 1743 } 1744 1745 case IEEE80211_FC0_SUBTYPE_ACTION: 1746 if (vap->iv_state == IEEE80211_S_RUN) { 1747 if (ieee80211_parse_action(ni, m0) == 0) 1748 ic->ic_recv_action(ni, wh, frm, efrm); 1749 } else 1750 vap->iv_stats.is_rx_mgtdiscard++; 1751 break; 1752 1753 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1754 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1755 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1756 vap->iv_stats.is_rx_mgtdiscard++; 1757 return; 1758 default: 1759 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1760 wh, "mgt", "subtype 0x%x not handled", subtype); 1761 vap->iv_stats.is_rx_badsubtype++; 1762 break; 1763 } 1764 #undef ISREASSOC 1765 #undef ISPROBE 1766 } 1767 1768 static void 1769 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1770 { 1771 } 1772