1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #ifdef __FreeBSD__ 30 __FBSDID("$FreeBSD$"); 31 #endif 32 33 /* 34 * IEEE 802.11 Station mode support. 35 */ 36 #include "opt_inet.h" 37 #include "opt_wlan.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/malloc.h> 43 #include <sys/kernel.h> 44 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/endian.h> 48 #include <sys/errno.h> 49 #include <sys/proc.h> 50 #include <sys/sysctl.h> 51 52 #include <net/if.h> 53 #include <net/if_media.h> 54 #include <net/if_llc.h> 55 #include <net/if_dl.h> 56 #include <net/if_var.h> 57 #include <net/ethernet.h> 58 59 #include <net/bpf.h> 60 61 #include <net80211/ieee80211_var.h> 62 #include <net80211/ieee80211_sta.h> 63 #include <net80211/ieee80211_input.h> 64 #ifdef IEEE80211_SUPPORT_SUPERG 65 #include <net80211/ieee80211_superg.h> 66 #endif 67 #include <net80211/ieee80211_ratectl.h> 68 #include <net80211/ieee80211_sta.h> 69 #include <net80211/ieee80211_vht.h> 70 71 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 72 73 static void sta_vattach(struct ieee80211vap *); 74 static void sta_beacon_miss(struct ieee80211vap *); 75 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 76 static int sta_input(struct ieee80211_node *, struct mbuf *, 77 const struct ieee80211_rx_stats *, int, int); 78 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 79 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 80 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 81 82 void 83 ieee80211_sta_attach(struct ieee80211com *ic) 84 { 85 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 86 } 87 88 void 89 ieee80211_sta_detach(struct ieee80211com *ic) 90 { 91 } 92 93 static void 94 sta_vdetach(struct ieee80211vap *vap) 95 { 96 } 97 98 static void 99 sta_vattach(struct ieee80211vap *vap) 100 { 101 vap->iv_newstate = sta_newstate; 102 vap->iv_input = sta_input; 103 vap->iv_recv_mgmt = sta_recv_mgmt; 104 vap->iv_recv_ctl = sta_recv_ctl; 105 vap->iv_opdetach = sta_vdetach; 106 vap->iv_bmiss = sta_beacon_miss; 107 } 108 109 /* 110 * Handle a beacon miss event. The common code filters out 111 * spurious events that can happen when scanning and/or before 112 * reaching RUN state. 113 */ 114 static void 115 sta_beacon_miss(struct ieee80211vap *vap) 116 { 117 struct ieee80211com *ic = vap->iv_ic; 118 119 IEEE80211_LOCK_ASSERT(ic); 120 121 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 122 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 123 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 124 125 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 126 "beacon miss, mode %s state %s\n", 127 ieee80211_opmode_name[vap->iv_opmode], 128 ieee80211_state_name[vap->iv_state]); 129 130 if (vap->iv_state == IEEE80211_S_CSA) { 131 /* 132 * A Channel Switch is pending; assume we missed the 133 * beacon that would've completed the process and just 134 * force the switch. If we made a mistake we'll not 135 * find the AP on the new channel and fall back to a 136 * normal scan. 137 */ 138 ieee80211_csa_completeswitch(ic); 139 return; 140 } 141 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 142 /* 143 * Send a directed probe req before falling back to a 144 * scan; if we receive a response ic_bmiss_count will 145 * be reset. Some cards mistakenly report beacon miss 146 * so this avoids the expensive scan if the ap is 147 * still there. 148 */ 149 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 150 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 151 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 152 return; 153 } 154 155 callout_stop(&vap->iv_swbmiss); 156 vap->iv_bmiss_count = 0; 157 vap->iv_stats.is_beacon_miss++; 158 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 159 #ifdef IEEE80211_SUPPORT_SUPERG 160 161 /* 162 * If we receive a beacon miss interrupt when using 163 * dynamic turbo, attempt to switch modes before 164 * reassociating. 165 */ 166 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 167 ieee80211_dturbo_switch(vap, 168 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 169 #endif 170 /* 171 * Try to reassociate before scanning for a new ap. 172 */ 173 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 174 } else { 175 /* 176 * Somebody else is controlling state changes (e.g. 177 * a user-mode app) don't do anything that would 178 * confuse them; just drop into scan mode so they'll 179 * notified of the state change and given control. 180 */ 181 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 182 } 183 } 184 185 /* 186 * Handle deauth with reason. We retry only for 187 * the cases where we might succeed. Otherwise 188 * we downgrade the ap and scan. 189 */ 190 static void 191 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 192 { 193 switch (reason) { 194 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 195 case IEEE80211_STATUS_TIMEOUT: 196 case IEEE80211_REASON_ASSOC_EXPIRE: 197 case IEEE80211_REASON_NOT_AUTHED: 198 case IEEE80211_REASON_NOT_ASSOCED: 199 case IEEE80211_REASON_ASSOC_LEAVE: 200 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 201 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 202 break; 203 default: 204 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 205 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 206 ieee80211_check_scan_current(vap); 207 break; 208 } 209 } 210 211 static void 212 sta_swbmiss_start(struct ieee80211vap *vap) 213 { 214 215 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) { 216 /* 217 * Start s/w beacon miss timer for devices w/o 218 * hardware support. We fudge a bit here since 219 * we're doing this in software. 220 */ 221 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 222 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval); 223 vap->iv_swbmiss_count = 0; 224 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 225 ieee80211_swbmiss, vap); 226 } 227 } 228 229 /* 230 * IEEE80211_M_STA vap state machine handler. 231 * This routine handles the main states in the 802.11 protocol. 232 */ 233 static int 234 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 235 { 236 struct ieee80211com *ic = vap->iv_ic; 237 struct ieee80211_node *ni; 238 enum ieee80211_state ostate; 239 240 IEEE80211_LOCK_ASSERT(ic); 241 242 ostate = vap->iv_state; 243 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 244 __func__, ieee80211_state_name[ostate], 245 ieee80211_state_name[nstate], arg); 246 vap->iv_state = nstate; /* state transition */ 247 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 248 if (ostate != IEEE80211_S_SCAN) 249 ieee80211_cancel_scan(vap); /* background scan */ 250 ni = vap->iv_bss; /* NB: no reference held */ 251 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 252 callout_stop(&vap->iv_swbmiss); 253 switch (nstate) { 254 case IEEE80211_S_INIT: 255 switch (ostate) { 256 case IEEE80211_S_SLEEP: 257 /* XXX wakeup */ 258 /* XXX driver hook to wakeup the hardware? */ 259 case IEEE80211_S_RUN: 260 IEEE80211_SEND_MGMT(ni, 261 IEEE80211_FC0_SUBTYPE_DISASSOC, 262 IEEE80211_REASON_ASSOC_LEAVE); 263 ieee80211_sta_leave(ni); 264 break; 265 case IEEE80211_S_ASSOC: 266 IEEE80211_SEND_MGMT(ni, 267 IEEE80211_FC0_SUBTYPE_DEAUTH, 268 IEEE80211_REASON_AUTH_LEAVE); 269 break; 270 case IEEE80211_S_SCAN: 271 ieee80211_cancel_scan(vap); 272 break; 273 default: 274 break; 275 } 276 if (ostate != IEEE80211_S_INIT) { 277 /* NB: optimize INIT -> INIT case */ 278 ieee80211_reset_bss(vap); 279 } 280 if (vap->iv_auth->ia_detach != NULL) 281 vap->iv_auth->ia_detach(vap); 282 break; 283 case IEEE80211_S_SCAN: 284 switch (ostate) { 285 case IEEE80211_S_INIT: 286 /* 287 * Initiate a scan. We can come here as a result 288 * of an IEEE80211_IOC_SCAN_REQ too in which case 289 * the vap will be marked with IEEE80211_FEXT_SCANREQ 290 * and the scan request parameters will be present 291 * in iv_scanreq. Otherwise we do the default. 292 */ 293 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 294 ieee80211_check_scan(vap, 295 vap->iv_scanreq_flags, 296 vap->iv_scanreq_duration, 297 vap->iv_scanreq_mindwell, 298 vap->iv_scanreq_maxdwell, 299 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 300 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 301 } else 302 ieee80211_check_scan_current(vap); 303 break; 304 case IEEE80211_S_SCAN: 305 case IEEE80211_S_AUTH: 306 case IEEE80211_S_ASSOC: 307 /* 308 * These can happen either because of a timeout 309 * on an assoc/auth response or because of a 310 * change in state that requires a reset. For 311 * the former we're called with a non-zero arg 312 * that is the cause for the failure; pass this 313 * to the scan code so it can update state. 314 * Otherwise trigger a new scan unless we're in 315 * manual roaming mode in which case an application 316 * must issue an explicit scan request. 317 */ 318 if (arg != 0) 319 ieee80211_scan_assoc_fail(vap, 320 vap->iv_bss->ni_macaddr, arg); 321 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 322 ieee80211_check_scan_current(vap); 323 break; 324 case IEEE80211_S_SLEEP: /* beacon miss */ 325 /* 326 * XXX if in sleep we need to wakeup the hardware. 327 */ 328 /* FALLTHROUGH */ 329 case IEEE80211_S_RUN: /* beacon miss */ 330 /* 331 * Beacon miss. Notify user space and if not 332 * under control of a user application (roaming 333 * manual) kick off a scan to re-connect. 334 */ 335 336 ieee80211_sta_leave(ni); 337 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 338 ieee80211_check_scan_current(vap); 339 break; 340 default: 341 goto invalid; 342 } 343 break; 344 case IEEE80211_S_AUTH: 345 switch (ostate) { 346 case IEEE80211_S_INIT: 347 case IEEE80211_S_SCAN: 348 IEEE80211_SEND_MGMT(ni, 349 IEEE80211_FC0_SUBTYPE_AUTH, 1); 350 break; 351 case IEEE80211_S_AUTH: 352 case IEEE80211_S_ASSOC: 353 switch (arg & 0xff) { 354 case IEEE80211_FC0_SUBTYPE_AUTH: 355 /* ??? */ 356 IEEE80211_SEND_MGMT(ni, 357 IEEE80211_FC0_SUBTYPE_AUTH, 2); 358 break; 359 case IEEE80211_FC0_SUBTYPE_DEAUTH: 360 sta_authretry(vap, ni, arg>>8); 361 break; 362 } 363 break; 364 case IEEE80211_S_SLEEP: 365 case IEEE80211_S_RUN: 366 switch (arg & 0xff) { 367 case IEEE80211_FC0_SUBTYPE_AUTH: 368 IEEE80211_SEND_MGMT(ni, 369 IEEE80211_FC0_SUBTYPE_AUTH, 2); 370 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 371 break; 372 case IEEE80211_FC0_SUBTYPE_DEAUTH: 373 ieee80211_sta_leave(ni); 374 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 375 /* try to reauth */ 376 IEEE80211_SEND_MGMT(ni, 377 IEEE80211_FC0_SUBTYPE_AUTH, 1); 378 } 379 break; 380 } 381 break; 382 default: 383 goto invalid; 384 } 385 break; 386 case IEEE80211_S_ASSOC: 387 switch (ostate) { 388 case IEEE80211_S_AUTH: 389 case IEEE80211_S_ASSOC: 390 IEEE80211_SEND_MGMT(ni, 391 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 392 break; 393 case IEEE80211_S_SLEEP: /* cannot happen */ 394 case IEEE80211_S_RUN: 395 ieee80211_sta_leave(ni); 396 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 397 IEEE80211_SEND_MGMT(ni, arg ? 398 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 399 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 400 } 401 break; 402 default: 403 goto invalid; 404 } 405 break; 406 case IEEE80211_S_RUN: 407 if (vap->iv_flags & IEEE80211_F_WPA) { 408 /* XXX validate prerequisites */ 409 } 410 switch (ostate) { 411 case IEEE80211_S_RUN: 412 case IEEE80211_S_CSA: 413 break; 414 case IEEE80211_S_AUTH: /* when join is done in fw */ 415 case IEEE80211_S_ASSOC: 416 #ifdef IEEE80211_DEBUG 417 if (ieee80211_msg_debug(vap)) { 418 ieee80211_note(vap, "%s with %s ssid ", 419 (vap->iv_opmode == IEEE80211_M_STA ? 420 "associated" : "synchronized"), 421 ether_sprintf(ni->ni_bssid)); 422 ieee80211_print_essid(vap->iv_bss->ni_essid, 423 ni->ni_esslen); 424 /* XXX MCS/HT */ 425 printf(" channel %d start %uMb\n", 426 ieee80211_chan2ieee(ic, ic->ic_curchan), 427 IEEE80211_RATE2MBS(ni->ni_txrate)); 428 } 429 #endif 430 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 431 ieee80211_notify_node_join(ni, 432 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 433 break; 434 case IEEE80211_S_SLEEP: 435 /* Wake up from sleep */ 436 vap->iv_sta_ps(vap, 0); 437 break; 438 default: 439 goto invalid; 440 } 441 ieee80211_sync_curchan(ic); 442 if (ostate != IEEE80211_S_RUN) 443 sta_swbmiss_start(vap); 444 /* 445 * When 802.1x is not in use mark the port authorized 446 * at this point so traffic can flow. 447 */ 448 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 449 ieee80211_node_authorize(ni); 450 /* 451 * Fake association when joining an existing bss. 452 * 453 * Don't do this if we're doing SLEEP->RUN. 454 */ 455 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 456 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 457 break; 458 case IEEE80211_S_CSA: 459 if (ostate != IEEE80211_S_RUN) 460 goto invalid; 461 break; 462 case IEEE80211_S_SLEEP: 463 sta_swbmiss_start(vap); 464 vap->iv_sta_ps(vap, 1); 465 break; 466 default: 467 invalid: 468 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 469 "%s: unexpected state transition %s -> %s\n", __func__, 470 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 471 break; 472 } 473 return 0; 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 DSTODS. 479 */ 480 static __inline int 481 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 482 { 483 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 484 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 485 const uint8_t *sa; 486 487 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 488 489 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 490 return 0; 491 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 492 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 493 #undef WH4 494 #undef QWH4 495 } 496 497 /* 498 * Return non-zero if the frame is an echo of a multicast 499 * frame sent by ourself. The dir is known to be FROMDS. 500 */ 501 static __inline int 502 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 503 { 504 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 505 506 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 507 return 0; 508 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 509 } 510 511 /* 512 * Decide if a received management frame should be 513 * printed when debugging is enabled. This filters some 514 * of the less interesting frames that come frequently 515 * (e.g. beacons). 516 */ 517 static __inline int 518 doprint(struct ieee80211vap *vap, int subtype) 519 { 520 switch (subtype) { 521 case IEEE80211_FC0_SUBTYPE_BEACON: 522 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 523 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 524 return 0; 525 } 526 return 1; 527 } 528 529 /* 530 * Process a received frame. The node associated with the sender 531 * should be supplied. If nothing was found in the node table then 532 * the caller is assumed to supply a reference to iv_bss instead. 533 * The RSSI and a timestamp are also supplied. The RSSI data is used 534 * during AP scanning to select a AP to associate with; it can have 535 * any units so long as values have consistent units and higher values 536 * mean ``better signal''. The receive timestamp is currently not used 537 * by the 802.11 layer. 538 */ 539 static int 540 sta_input(struct ieee80211_node *ni, struct mbuf *m, 541 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 542 { 543 struct ieee80211vap *vap = ni->ni_vap; 544 struct ieee80211com *ic = ni->ni_ic; 545 struct ifnet *ifp = vap->iv_ifp; 546 struct ieee80211_frame *wh; 547 struct ieee80211_key *key; 548 struct ether_header *eh; 549 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 550 uint8_t dir, type, subtype, qos; 551 uint8_t *bssid; 552 int is_hw_decrypted = 0; 553 int has_decrypted = 0; 554 555 /* 556 * Some devices do hardware decryption all the way through 557 * to pretending the frame wasn't encrypted in the first place. 558 * So, tag it appropriately so it isn't discarded inappropriately. 559 */ 560 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 561 is_hw_decrypted = 1; 562 563 if (m->m_flags & M_AMPDU_MPDU) { 564 /* 565 * Fastpath for A-MPDU reorder q resubmission. Frames 566 * w/ M_AMPDU_MPDU marked have already passed through 567 * here but were received out of order and been held on 568 * the reorder queue. When resubmitted they are marked 569 * with the M_AMPDU_MPDU flag and we can bypass most of 570 * the normal processing. 571 */ 572 wh = mtod(m, struct ieee80211_frame *); 573 type = IEEE80211_FC0_TYPE_DATA; 574 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 575 subtype = IEEE80211_FC0_SUBTYPE_QOS; 576 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 577 goto resubmit_ampdu; 578 } 579 580 KASSERT(ni != NULL, ("null node")); 581 ni->ni_inact = ni->ni_inact_reload; 582 583 type = -1; /* undefined */ 584 585 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 586 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 587 ni->ni_macaddr, NULL, 588 "too short (1): len %u", m->m_pkthdr.len); 589 vap->iv_stats.is_rx_tooshort++; 590 goto out; 591 } 592 /* 593 * Bit of a cheat here, we use a pointer for a 3-address 594 * frame format but don't reference fields past outside 595 * ieee80211_frame_min w/o first validating the data is 596 * present. 597 */ 598 wh = mtod(m, struct ieee80211_frame *); 599 600 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 601 IEEE80211_FC0_VERSION_0) { 602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 603 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 604 wh->i_fc[0], wh->i_fc[1]); 605 vap->iv_stats.is_rx_badversion++; 606 goto err; 607 } 608 609 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 610 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 611 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 612 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 613 bssid = wh->i_addr2; 614 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 615 /* not interested in */ 616 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 617 bssid, NULL, "%s", "not to bss"); 618 vap->iv_stats.is_rx_wrongbss++; 619 goto out; 620 } 621 622 /* 623 * Some devices may be in a promiscuous mode 624 * where they receive frames for multiple station 625 * addresses. 626 * 627 * If we receive a data frame that isn't 628 * destined to our VAP MAC, drop it. 629 * 630 * XXX TODO: This is only enforced when not scanning; 631 * XXX it assumes a software-driven scan will put the NIC 632 * XXX into a "no data frames" mode before setting this 633 * XXX flag. Otherwise it may be possible that we'll still 634 * XXX process data frames whilst scanning. 635 */ 636 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 637 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 639 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 640 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 641 vap->iv_stats.is_rx_wrongbss++; 642 goto out; 643 } 644 645 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 646 ni->ni_noise = nf; 647 if ( IEEE80211_HAS_SEQ(type, subtype) && 648 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 649 uint8_t tid = ieee80211_gettid(wh); 650 if (IEEE80211_QOS_HAS_SEQ(wh) && 651 TID_TO_WME_AC(tid) >= WME_AC_VI) 652 ic->ic_wme.wme_hipri_traffic++; 653 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs)) 654 goto out; 655 } 656 } 657 658 switch (type) { 659 case IEEE80211_FC0_TYPE_DATA: 660 hdrspace = ieee80211_hdrspace(ic, wh); 661 if (m->m_len < hdrspace && 662 (m = m_pullup(m, hdrspace)) == NULL) { 663 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 664 ni->ni_macaddr, NULL, 665 "data too short: expecting %u", hdrspace); 666 vap->iv_stats.is_rx_tooshort++; 667 goto out; /* XXX */ 668 } 669 /* 670 * Handle A-MPDU re-ordering. If the frame is to be 671 * processed directly then ieee80211_ampdu_reorder 672 * will return 0; otherwise it has consumed the mbuf 673 * and we should do nothing more with it. 674 */ 675 if ((m->m_flags & M_AMPDU) && 676 (dir == IEEE80211_FC1_DIR_FROMDS || 677 dir == IEEE80211_FC1_DIR_DSTODS) && 678 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 679 m = NULL; 680 goto out; 681 } 682 resubmit_ampdu: 683 if (dir == IEEE80211_FC1_DIR_FROMDS) { 684 if ((ifp->if_flags & IFF_SIMPLEX) && 685 isfromds_mcastecho(vap, wh)) { 686 /* 687 * In IEEE802.11 network, multicast 688 * packets sent from "me" are broadcast 689 * from the AP; silently discard for 690 * SIMPLEX interface. 691 */ 692 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 693 wh, "data", "%s", "multicast echo"); 694 vap->iv_stats.is_rx_mcastecho++; 695 goto out; 696 } 697 if ((vap->iv_flags & IEEE80211_F_DWDS) && 698 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 699 /* 700 * DWDS sta's must drop 3-address mcast frames 701 * as they will be sent separately as a 4-addr 702 * frame. Accepting the 3-addr frame will 703 * confuse the bridge into thinking the sending 704 * sta is located at the end of WDS link. 705 */ 706 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 707 "3-address data", "%s", "DWDS enabled"); 708 vap->iv_stats.is_rx_mcastecho++; 709 goto out; 710 } 711 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 712 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 713 IEEE80211_DISCARD(vap, 714 IEEE80211_MSG_INPUT, wh, "4-address data", 715 "%s", "DWDS not enabled"); 716 vap->iv_stats.is_rx_wrongdir++; 717 goto out; 718 } 719 if ((ifp->if_flags & IFF_SIMPLEX) && 720 isdstods_mcastecho(vap, wh)) { 721 /* 722 * In IEEE802.11 network, multicast 723 * packets sent from "me" are broadcast 724 * from the AP; silently discard for 725 * SIMPLEX interface. 726 */ 727 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 728 "4-address data", "%s", "multicast echo"); 729 vap->iv_stats.is_rx_mcastecho++; 730 goto out; 731 } 732 } else { 733 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 734 "data", "incorrect dir 0x%x", dir); 735 vap->iv_stats.is_rx_wrongdir++; 736 goto out; 737 } 738 739 /* 740 * Handle privacy requirements for hardware decryption 741 * devices. 742 * 743 * For those devices, a handful of things happen. 744 * 745 * + If IV has been stripped, then we can't run 746 * ieee80211_crypto_decap() - none of the key 747 * + If MIC has been stripped, we can't validate 748 * MIC here. 749 * + If MIC fails, then we need to communicate a 750 * MIC failure up to the stack - but we don't know 751 * which key was used. 752 */ 753 754 /* 755 * Handle privacy requirements. Note that we 756 * must not be preempted from here until after 757 * we (potentially) call ieee80211_crypto_demic; 758 * otherwise we may violate assumptions in the 759 * crypto cipher modules used to do delayed update 760 * of replay sequence numbers. 761 */ 762 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 763 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 764 /* 765 * Discard encrypted frames when privacy is off. 766 */ 767 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 768 wh, "WEP", "%s", "PRIVACY off"); 769 vap->iv_stats.is_rx_noprivacy++; 770 IEEE80211_NODE_STAT(ni, rx_noprivacy); 771 goto out; 772 } 773 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 774 /* NB: stats+msgs handled in crypto_decap */ 775 IEEE80211_NODE_STAT(ni, rx_wepfail); 776 goto out; 777 } 778 wh = mtod(m, struct ieee80211_frame *); 779 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 780 has_decrypted = 1; 781 } else { 782 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 783 key = NULL; 784 } 785 786 /* 787 * Save QoS bits for use below--before we strip the header. 788 */ 789 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) 790 qos = ieee80211_getqos(wh)[0]; 791 else 792 qos = 0; 793 794 /* 795 * Next up, any fragmentation. 796 */ 797 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 798 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted); 799 if (m == NULL) { 800 /* Fragment dropped or frame not complete yet */ 801 goto out; 802 } 803 } 804 wh = NULL; /* no longer valid, catch any uses */ 805 806 /* 807 * Next strip any MSDU crypto bits. 808 * 809 * Note: we can't do MIC stripping/verification if the 810 * upper layer has stripped it. We have to check MIC 811 * ourselves. So, key may be NULL, but we have to check 812 * the RX status. 813 */ 814 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 815 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 816 ni->ni_macaddr, "data", "%s", "demic error"); 817 vap->iv_stats.is_rx_demicfail++; 818 IEEE80211_NODE_STAT(ni, rx_demicfail); 819 goto out; 820 } 821 822 /* copy to listener after decrypt */ 823 if (ieee80211_radiotap_active_vap(vap)) 824 ieee80211_radiotap_rx(vap, m); 825 need_tap = 0; 826 827 /* 828 * Finally, strip the 802.11 header. 829 */ 830 m = ieee80211_decap(vap, m, hdrspace, qos); 831 if (m == NULL) { 832 /* XXX mask bit to check for both */ 833 /* don't count Null data frames as errors */ 834 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 835 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 836 goto out; 837 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 838 ni->ni_macaddr, "data", "%s", "decap error"); 839 vap->iv_stats.is_rx_decap++; 840 IEEE80211_NODE_STAT(ni, rx_decap); 841 goto err; 842 } 843 if (!(qos & IEEE80211_QOS_AMSDU)) 844 eh = mtod(m, struct ether_header *); 845 else 846 eh = NULL; 847 if (!ieee80211_node_is_authorized(ni)) { 848 /* 849 * Deny any non-PAE frames received prior to 850 * authorization. For open/shared-key 851 * authentication the port is mark authorized 852 * after authentication completes. For 802.1x 853 * the port is not marked authorized by the 854 * authenticator until the handshake has completed. 855 */ 856 if (eh == NULL || 857 eh->ether_type != htons(ETHERTYPE_PAE)) { 858 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 859 ni->ni_macaddr, "data", "unauthorized or " 860 "unknown port: ether type 0x%x len %u", 861 eh == NULL ? -1 : eh->ether_type, 862 m->m_pkthdr.len); 863 vap->iv_stats.is_rx_unauth++; 864 IEEE80211_NODE_STAT(ni, rx_unauth); 865 goto err; 866 } 867 } else { 868 /* 869 * When denying unencrypted frames, discard 870 * any non-PAE frames received without encryption. 871 */ 872 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 873 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 874 (is_hw_decrypted == 0) && 875 (eh == NULL || 876 eh->ether_type != htons(ETHERTYPE_PAE))) { 877 /* 878 * Drop unencrypted frames. 879 */ 880 vap->iv_stats.is_rx_unencrypted++; 881 IEEE80211_NODE_STAT(ni, rx_unencrypted); 882 goto out; 883 } 884 } 885 /* XXX require HT? */ 886 if (qos & IEEE80211_QOS_AMSDU) { 887 m = ieee80211_decap_amsdu(ni, m); 888 if (m == NULL) 889 return IEEE80211_FC0_TYPE_DATA; 890 } else { 891 #ifdef IEEE80211_SUPPORT_SUPERG 892 m = ieee80211_decap_fastframe(vap, ni, m); 893 if (m == NULL) 894 return IEEE80211_FC0_TYPE_DATA; 895 #endif 896 } 897 ieee80211_deliver_data(vap, ni, m); 898 return IEEE80211_FC0_TYPE_DATA; 899 900 case IEEE80211_FC0_TYPE_MGT: 901 vap->iv_stats.is_rx_mgmt++; 902 IEEE80211_NODE_STAT(ni, rx_mgmt); 903 if (dir != IEEE80211_FC1_DIR_NODS) { 904 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 905 wh, "data", "incorrect dir 0x%x", dir); 906 vap->iv_stats.is_rx_wrongdir++; 907 goto err; 908 } 909 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 910 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 911 ni->ni_macaddr, "mgt", "too short: len %u", 912 m->m_pkthdr.len); 913 vap->iv_stats.is_rx_tooshort++; 914 goto out; 915 } 916 #ifdef IEEE80211_DEBUG 917 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 918 ieee80211_msg_dumppkts(vap)) { 919 if_printf(ifp, "received %s from %s rssi %d\n", 920 ieee80211_mgt_subtype_name(subtype), 921 ether_sprintf(wh->i_addr2), rssi); 922 } 923 #endif 924 925 /* 926 * Note: See above for hardware offload privacy requirements. 927 * It also applies here. 928 */ 929 930 /* 931 * Again, having encrypted flag set check would be good, but 932 * then we have to also handle crypto_decap() like above. 933 */ 934 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 935 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 936 /* 937 * Only shared key auth frames with a challenge 938 * should be encrypted, discard all others. 939 */ 940 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 941 wh, ieee80211_mgt_subtype_name(subtype), 942 "%s", "WEP set but not permitted"); 943 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 944 goto out; 945 } 946 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 947 /* 948 * Discard encrypted frames when privacy is off. 949 */ 950 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 951 wh, "mgt", "%s", "WEP set but PRIVACY off"); 952 vap->iv_stats.is_rx_noprivacy++; 953 goto out; 954 } 955 hdrspace = ieee80211_hdrspace(ic, wh); 956 957 /* 958 * Again, if IV/MIC was stripped, then this whole 959 * setup will fail. That's going to need some poking. 960 */ 961 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 962 /* NB: stats+msgs handled in crypto_decap */ 963 goto out; 964 } 965 has_decrypted = 1; 966 wh = mtod(m, struct ieee80211_frame *); 967 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 968 } 969 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 970 goto out; 971 972 case IEEE80211_FC0_TYPE_CTL: 973 vap->iv_stats.is_rx_ctl++; 974 IEEE80211_NODE_STAT(ni, rx_ctrl); 975 vap->iv_recv_ctl(ni, m, subtype); 976 goto out; 977 978 default: 979 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 980 wh, NULL, "bad frame type 0x%x", type); 981 /* should not come here */ 982 break; 983 } 984 err: 985 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 986 out: 987 if (m != NULL) { 988 if (need_tap && ieee80211_radiotap_active_vap(vap)) 989 ieee80211_radiotap_rx(vap, m); 990 m_freem(m); 991 } 992 return type; 993 } 994 995 static void 996 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 997 int rssi, int nf, uint16_t seq, uint16_t status) 998 { 999 struct ieee80211vap *vap = ni->ni_vap; 1000 1001 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 1002 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1003 ni->ni_macaddr, "open auth", 1004 "bad sta auth mode %u", ni->ni_authmode); 1005 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 1006 return; 1007 } 1008 if (vap->iv_state != IEEE80211_S_AUTH || 1009 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1010 vap->iv_stats.is_rx_bad_auth++; 1011 return; 1012 } 1013 if (status != 0) { 1014 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1015 ni, "open auth failed (reason %d)", status); 1016 vap->iv_stats.is_rx_auth_fail++; 1017 vap->iv_stats.is_rx_authfail_code = status; 1018 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1019 IEEE80211_SCAN_FAIL_STATUS); 1020 } else 1021 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1022 } 1023 1024 static void 1025 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1026 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1027 uint16_t seq, uint16_t status) 1028 { 1029 struct ieee80211vap *vap = ni->ni_vap; 1030 uint8_t *challenge; 1031 1032 /* 1033 * NB: this can happen as we allow pre-shared key 1034 * authentication to be enabled w/o wep being turned 1035 * on so that configuration of these can be done 1036 * in any order. It may be better to enforce the 1037 * ordering in which case this check would just be 1038 * for sanity/consistency. 1039 */ 1040 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1041 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1042 ni->ni_macaddr, "shared key auth", 1043 "%s", " PRIVACY is disabled"); 1044 goto bad; 1045 } 1046 /* 1047 * Pre-shared key authentication is evil; accept 1048 * it only if explicitly configured (it is supported 1049 * mainly for compatibility with clients like OS X). 1050 */ 1051 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1052 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1053 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1054 ni->ni_macaddr, "shared key auth", 1055 "bad sta auth mode %u", ni->ni_authmode); 1056 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1057 goto bad; 1058 } 1059 1060 challenge = NULL; 1061 if (frm + 1 < efrm) { 1062 if ((frm[1] + 2) > (efrm - frm)) { 1063 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1064 ni->ni_macaddr, "shared key auth", 1065 "ie %d/%d too long", 1066 frm[0], (frm[1] + 2) - (efrm - frm)); 1067 vap->iv_stats.is_rx_bad_auth++; 1068 goto bad; 1069 } 1070 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1071 challenge = frm; 1072 frm += frm[1] + 2; 1073 } 1074 switch (seq) { 1075 case IEEE80211_AUTH_SHARED_CHALLENGE: 1076 case IEEE80211_AUTH_SHARED_RESPONSE: 1077 if (challenge == NULL) { 1078 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1079 ni->ni_macaddr, "shared key auth", 1080 "%s", "no challenge"); 1081 vap->iv_stats.is_rx_bad_auth++; 1082 goto bad; 1083 } 1084 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1085 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1086 ni->ni_macaddr, "shared key auth", 1087 "bad challenge len %d", challenge[1]); 1088 vap->iv_stats.is_rx_bad_auth++; 1089 goto bad; 1090 } 1091 default: 1092 break; 1093 } 1094 if (vap->iv_state != IEEE80211_S_AUTH) 1095 return; 1096 switch (seq) { 1097 case IEEE80211_AUTH_SHARED_PASS: 1098 if (ni->ni_challenge != NULL) { 1099 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1100 ni->ni_challenge = NULL; 1101 } 1102 if (status != 0) { 1103 IEEE80211_NOTE_FRAME(vap, 1104 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1105 "shared key auth failed (reason %d)", status); 1106 vap->iv_stats.is_rx_auth_fail++; 1107 vap->iv_stats.is_rx_authfail_code = status; 1108 return; 1109 } 1110 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1111 break; 1112 case IEEE80211_AUTH_SHARED_CHALLENGE: 1113 if (!ieee80211_alloc_challenge(ni)) 1114 return; 1115 /* XXX could optimize by passing recvd challenge */ 1116 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1117 IEEE80211_SEND_MGMT(ni, 1118 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1119 break; 1120 default: 1121 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1122 wh, "shared key auth", "bad seq %d", seq); 1123 vap->iv_stats.is_rx_bad_auth++; 1124 return; 1125 } 1126 return; 1127 bad: 1128 /* 1129 * Kick the state machine. This short-circuits 1130 * using the mgt frame timeout to trigger the 1131 * state transition. 1132 */ 1133 if (vap->iv_state == IEEE80211_S_AUTH) 1134 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1135 IEEE80211_SCAN_FAIL_STATUS); 1136 } 1137 1138 /* 1139 * Parse the WME IE for QoS and U-APSD information. 1140 * 1141 * Returns -1 if the IE isn't found, 1 if it's found. 1142 */ 1143 int 1144 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh, 1145 struct ieee80211_node *ni) 1146 { 1147 u_int len = frm[1]; 1148 1149 ni->ni_uapsd = 0; 1150 1151 if (len < sizeof(struct ieee80211_wme_param)-2) { 1152 IEEE80211_DISCARD_IE(ni->ni_vap, 1153 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1154 wh, "WME", "too short, len %u", len); 1155 return -1; 1156 } 1157 1158 ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET]; 1159 1160 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC, 1161 ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd); 1162 1163 return 1; 1164 } 1165 1166 int 1167 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1168 const struct ieee80211_frame *wh, uint8_t *qosinfo) 1169 { 1170 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1171 u_int len = frm[1], qosinfo_count; 1172 int i; 1173 1174 *qosinfo = 0; 1175 1176 if (len < sizeof(struct ieee80211_wme_param)-2) { 1177 IEEE80211_DISCARD_IE(vap, 1178 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1179 wh, "WME", "too short, len %u", len); 1180 return -1; 1181 } 1182 *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1183 qosinfo_count = *qosinfo & WME_QOSINFO_COUNT; 1184 1185 /* XXX do proper check for wraparound */ 1186 if (qosinfo_count == wme->wme_wmeChanParams.cap_info) 1187 return 0; 1188 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1189 for (i = 0; i < WME_NUM_AC; i++) { 1190 struct wmeParams *wmep = 1191 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1192 /* NB: ACI not used */ 1193 wmep->wmep_acm = _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_ACM); 1194 wmep->wmep_aifsn = 1195 _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_AIFSN); 1196 wmep->wmep_logcwmin = 1197 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMIN); 1198 wmep->wmep_logcwmax = 1199 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMAX); 1200 wmep->wmep_txopLimit = le16dec(frm+2); 1201 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 1202 "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n", 1203 __func__, 1204 i, 1205 wmep->wmep_acm, 1206 wmep->wmep_aifsn, 1207 wmep->wmep_logcwmin, 1208 wmep->wmep_logcwmax, 1209 wmep->wmep_txopLimit); 1210 frm += 4; 1211 } 1212 wme->wme_wmeChanParams.cap_info = qosinfo_count; 1213 return 1; 1214 } 1215 1216 /* 1217 * Process 11h Channel Switch Announcement (CSA) ie. If this 1218 * is the first CSA then initiate the switch. Otherwise we 1219 * track state and trigger completion and/or cancel of the switch. 1220 * XXX should be public for IBSS use 1221 */ 1222 static void 1223 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1224 const struct ieee80211_frame *wh) 1225 { 1226 struct ieee80211com *ic = vap->iv_ic; 1227 const struct ieee80211_csa_ie *csa = 1228 (const struct ieee80211_csa_ie *) frm; 1229 1230 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1231 ("state %s", ieee80211_state_name[vap->iv_state])); 1232 1233 if (csa->csa_mode > 1) { 1234 IEEE80211_DISCARD_IE(vap, 1235 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1236 wh, "CSA", "invalid mode %u", csa->csa_mode); 1237 return; 1238 } 1239 IEEE80211_LOCK(ic); 1240 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1241 /* 1242 * Convert the channel number to a channel reference. We 1243 * try first to preserve turbo attribute of the current 1244 * channel then fallback. Note this will not work if the 1245 * CSA specifies a channel that requires a band switch (e.g. 1246 * 11a => 11g). This is intentional as 11h is defined only 1247 * for 5GHz/11a and because the switch does not involve a 1248 * reassociation, protocol state (capabilities, negotated 1249 * rates, etc) may/will be wrong. 1250 */ 1251 struct ieee80211_channel *c = 1252 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1253 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1254 if (c == NULL) { 1255 c = ieee80211_find_channel_byieee(ic, 1256 csa->csa_newchan, 1257 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1258 if (c == NULL) { 1259 IEEE80211_DISCARD_IE(vap, 1260 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1261 wh, "CSA", "invalid channel %u", 1262 csa->csa_newchan); 1263 goto done; 1264 } 1265 } 1266 #if IEEE80211_CSA_COUNT_MIN > 0 1267 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1268 /* 1269 * Require at least IEEE80211_CSA_COUNT_MIN count to 1270 * reduce the risk of being redirected by a fabricated 1271 * CSA. If a valid CSA is dropped we'll still get a 1272 * beacon miss when the AP leaves the channel so we'll 1273 * eventually follow to the new channel. 1274 * 1275 * NOTE: this violates the 11h spec that states that 1276 * count may be any value and if 0 then a switch 1277 * should happen asap. 1278 */ 1279 IEEE80211_DISCARD_IE(vap, 1280 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1281 wh, "CSA", "count %u too small, must be >= %u", 1282 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1283 goto done; 1284 } 1285 #endif 1286 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1287 } else { 1288 /* 1289 * Validate this ie against the initial CSA. We require 1290 * mode and channel not change and the count must be 1291 * monotonically decreasing. This may be pointless and 1292 * canceling the switch as a result may be too paranoid but 1293 * in the worst case if we drop out of CSA because of this 1294 * and the AP does move then we'll just end up taking a 1295 * beacon miss and scan to find the AP. 1296 * 1297 * XXX may want <= on count as we also process ProbeResp 1298 * frames and those may come in w/ the same count as the 1299 * previous beacon; but doing so leaves us open to a stuck 1300 * count until we add a dead-man timer 1301 */ 1302 if (!(csa->csa_count < ic->ic_csa_count && 1303 csa->csa_mode == ic->ic_csa_mode && 1304 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1305 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1306 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1307 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1308 ic->ic_csa_newchan, ic->ic_csa_count, 1309 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1310 ieee80211_csa_cancelswitch(ic); 1311 } else { 1312 if (csa->csa_count <= 1) 1313 ieee80211_csa_completeswitch(ic); 1314 else 1315 ic->ic_csa_count = csa->csa_count; 1316 } 1317 } 1318 done: 1319 IEEE80211_UNLOCK(ic); 1320 } 1321 1322 /* 1323 * Return non-zero if a background scan may be continued: 1324 * o bg scan is active 1325 * o no channel switch is pending 1326 * o there has not been any traffic recently 1327 * o no full-offload scan support (no need for explicitly continuing scan then) 1328 * 1329 * Note we do not check if there is an administrative enable; 1330 * this is only done to start the scan. We assume that any 1331 * change in state will be accompanied by a request to cancel 1332 * active scans which will otherwise cause this test to fail. 1333 */ 1334 static __inline int 1335 contbgscan(struct ieee80211vap *vap) 1336 { 1337 struct ieee80211com *ic = vap->iv_ic; 1338 1339 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1340 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1341 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) && 1342 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1343 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1344 } 1345 1346 /* 1347 * Return non-zero if a backgrond scan may be started: 1348 * o bg scanning is administratively enabled 1349 * o no channel switch is pending 1350 * o we are not boosted on a dynamic turbo channel 1351 * o there has not been a scan recently 1352 * o there has not been any traffic recently (don't check if full-offload scan) 1353 */ 1354 static __inline int 1355 startbgscan(struct ieee80211vap *vap) 1356 { 1357 struct ieee80211com *ic = vap->iv_ic; 1358 1359 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1360 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1361 #ifdef IEEE80211_SUPPORT_SUPERG 1362 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1363 #endif 1364 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1365 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) || 1366 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))); 1367 } 1368 1369 #ifdef notyet 1370 /* 1371 * Compare two quiet IEs and return if they are equivalent. 1372 * 1373 * The tbttcount isnt checked - that's not part of the configuration. 1374 */ 1375 static int 1376 compare_quiet_ie(const struct ieee80211_quiet_ie *q1, 1377 const struct ieee80211_quiet_ie *q2) 1378 { 1379 1380 if (q1->period != q2->period) 1381 return (0); 1382 if (le16dec(&q1->duration) != le16dec(&q2->duration)) 1383 return (0); 1384 if (le16dec(&q1->offset) != le16dec(&q2->offset)) 1385 return (0); 1386 return (1); 1387 } 1388 #endif 1389 1390 static void 1391 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1392 const struct ieee80211_rx_stats *rxs, 1393 int rssi, int nf) 1394 { 1395 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1396 struct ieee80211vap *vap = ni->ni_vap; 1397 struct ieee80211com *ic = ni->ni_ic; 1398 struct ieee80211_channel *rxchan = ic->ic_curchan; 1399 struct ieee80211_frame *wh; 1400 int ht_state_change = 0, do_ht = 0; 1401 uint8_t *frm, *efrm; 1402 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1403 uint8_t *vhtcap, *vhtopmode; 1404 uint8_t rate; 1405 uint8_t qosinfo; 1406 1407 wh = mtod(m0, struct ieee80211_frame *); 1408 frm = (uint8_t *)&wh[1]; 1409 efrm = mtod(m0, uint8_t *) + m0->m_len; 1410 switch (subtype) { 1411 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1412 case IEEE80211_FC0_SUBTYPE_BEACON: { 1413 struct ieee80211_scanparams scan; 1414 struct ieee80211_channel *c; 1415 /* 1416 * We process beacon/probe response frames: 1417 * o when scanning, or 1418 * o station mode when associated (to collect state 1419 * updates such as 802.11g slot time) 1420 * Frames otherwise received are discarded. 1421 */ 1422 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1423 vap->iv_stats.is_rx_mgtdiscard++; 1424 return; 1425 } 1426 1427 /* Override RX channel as appropriate */ 1428 if (rxs != NULL) { 1429 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1430 if (c != NULL) 1431 rxchan = c; 1432 } 1433 1434 /* XXX probe response in sta mode when !scanning? */ 1435 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1436 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1437 vap->iv_stats.is_beacon_bad++; 1438 return; 1439 } 1440 1441 /* 1442 * Count frame now that we know it's to be processed. 1443 */ 1444 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1445 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1446 IEEE80211_NODE_STAT(ni, rx_beacons); 1447 } else 1448 IEEE80211_NODE_STAT(ni, rx_proberesp); 1449 /* 1450 * When operating in station mode, check for state updates. 1451 * Be careful to ignore beacons received while doing a 1452 * background scan. We consider only 11g/WMM stuff right now. 1453 */ 1454 if (ni->ni_associd != 0 && 1455 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1456 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1457 /* record tsf of last beacon */ 1458 memcpy(ni->ni_tstamp.data, scan.tstamp, 1459 sizeof(ni->ni_tstamp)); 1460 /* count beacon frame for s/w bmiss handling */ 1461 vap->iv_swbmiss_count++; 1462 vap->iv_bmiss_count = 0; 1463 if (ni->ni_erp != scan.erp) { 1464 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1465 wh->i_addr2, 1466 "erp change: was 0x%x, now 0x%x", 1467 ni->ni_erp, scan.erp); 1468 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1469 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1470 vap->iv_flags |= IEEE80211_F_USEPROT; 1471 else 1472 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1473 ni->ni_erp = scan.erp; 1474 /* XXX statistic */ 1475 /* driver notification */ 1476 ieee80211_vap_update_erp_protmode(vap); 1477 } 1478 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1479 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1480 wh->i_addr2, 1481 "capabilities change: was 0x%x, now 0x%x", 1482 ni->ni_capinfo, scan.capinfo); 1483 /* 1484 * NB: we assume short preamble doesn't 1485 * change dynamically 1486 */ 1487 ieee80211_vap_set_shortslottime(vap, 1488 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1489 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1490 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1491 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1492 /* XXX statistic */ 1493 } 1494 if (scan.wme != NULL && 1495 (ni->ni_flags & IEEE80211_NODE_QOS)) { 1496 int _retval; 1497 if ((_retval = ieee80211_parse_wmeparams(vap, 1498 scan.wme, wh, &qosinfo)) >= 0) { 1499 if (qosinfo & WME_CAPINFO_UAPSD_EN) 1500 ni->ni_flags |= 1501 IEEE80211_NODE_UAPSD; 1502 if (_retval > 0) 1503 ieee80211_wme_updateparams(vap); 1504 } 1505 } else 1506 ni->ni_flags &= ~IEEE80211_NODE_UAPSD; 1507 #ifdef IEEE80211_SUPPORT_SUPERG 1508 if (scan.ath != NULL) 1509 ieee80211_parse_athparams(ni, scan.ath, wh); 1510 #endif 1511 if (scan.htcap != NULL && scan.htinfo != NULL && 1512 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1513 /* XXX state changes? */ 1514 ieee80211_ht_updateparams(ni, 1515 scan.htcap, scan.htinfo); 1516 do_ht = 1; 1517 } 1518 if (scan.vhtcap != NULL && scan.vhtopmode != NULL && 1519 (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) { 1520 /* XXX state changes? */ 1521 ieee80211_vht_updateparams(ni, 1522 scan.vhtcap, scan.vhtopmode); 1523 do_ht = 1; 1524 } 1525 if (do_ht) { 1526 if (ieee80211_ht_updateparams_final(ni, 1527 scan.htcap, scan.htinfo)) 1528 ht_state_change = 1; 1529 } 1530 1531 /* 1532 * If we have a quiet time IE then report it up to 1533 * the driver. 1534 * 1535 * Otherwise, inform the driver that the quiet time 1536 * IE has disappeared - only do that once rather than 1537 * spamming it each time. 1538 */ 1539 if (scan.quiet) { 1540 ic->ic_set_quiet(ni, scan.quiet); 1541 ni->ni_quiet_ie_set = 1; 1542 memcpy(&ni->ni_quiet_ie, scan.quiet, 1543 sizeof(struct ieee80211_quiet_ie)); 1544 } else { 1545 if (ni->ni_quiet_ie_set == 1) 1546 ic->ic_set_quiet(ni, NULL); 1547 ni->ni_quiet_ie_set = 0; 1548 bzero(&ni->ni_quiet_ie, 1549 sizeof(struct ieee80211_quiet_ie)); 1550 } 1551 1552 if (scan.tim != NULL) { 1553 struct ieee80211_tim_ie *tim = 1554 (struct ieee80211_tim_ie *) scan.tim; 1555 /* 1556 * XXX Check/debug this code; see if it's about 1557 * the right time to force the VAP awake if we 1558 * receive a frame destined for us? 1559 */ 1560 int aid = IEEE80211_AID(ni->ni_associd); 1561 int ix = aid / NBBY; 1562 int min = tim->tim_bitctl &~ 1; 1563 int max = tim->tim_len + min - 4; 1564 int tim_ucast = 0, tim_mcast = 0; 1565 1566 /* 1567 * Only do this for unicast traffic in the TIM 1568 * The multicast traffic notification for 1569 * the scan notification stuff should occur 1570 * differently. 1571 */ 1572 if (min <= ix && ix <= max && 1573 isset(tim->tim_bitmap - min, aid)) { 1574 tim_ucast = 1; 1575 } 1576 1577 /* 1578 * Do a separate notification 1579 * for the multicast bit being set. 1580 */ 1581 if (tim->tim_bitctl & 1) { 1582 tim_mcast = 1; 1583 } 1584 1585 /* 1586 * If the TIM indicates there's traffic for 1587 * us then get us out of STA mode powersave. 1588 */ 1589 if (tim_ucast == 1) { 1590 /* 1591 * Wake us out of SLEEP state if we're 1592 * in it; and if we're doing bgscan 1593 * then wake us out of STA powersave. 1594 */ 1595 ieee80211_sta_tim_notify(vap, 1); 1596 1597 /* 1598 * This is preventing us from 1599 * continuing a bgscan; because it 1600 * tricks the contbgscan() 1601 * routine to think there's always 1602 * traffic for us. 1603 * 1604 * I think we need both an RX and 1605 * TX ic_lastdata field. 1606 */ 1607 ic->ic_lastdata = ticks; 1608 } 1609 1610 ni->ni_dtim_count = tim->tim_count; 1611 ni->ni_dtim_period = tim->tim_period; 1612 } 1613 if (scan.csa != NULL && 1614 (vap->iv_flags & IEEE80211_F_DOTH)) 1615 ieee80211_parse_csaparams(vap, scan.csa, wh); 1616 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1617 /* 1618 * No CSA ie or 11h disabled, but a channel 1619 * switch is pending; drop out so we aren't 1620 * stuck in CSA state. If the AP really is 1621 * moving we'll get a beacon miss and scan. 1622 */ 1623 IEEE80211_LOCK(ic); 1624 ieee80211_csa_cancelswitch(ic); 1625 IEEE80211_UNLOCK(ic); 1626 } 1627 /* 1628 * If scanning, pass the info to the scan module. 1629 * Otherwise, check if it's the right time to do 1630 * a background scan. Background scanning must 1631 * be enabled and we must not be operating in the 1632 * turbo phase of dynamic turbo mode. Then, 1633 * it's been a while since the last background 1634 * scan and if no data frames have come through 1635 * recently, kick off a scan. Note that this 1636 * is the mechanism by which a background scan 1637 * is started _and_ continued each time we 1638 * return on-channel to receive a beacon from 1639 * our ap. 1640 */ 1641 if (ic->ic_flags & IEEE80211_F_SCAN) { 1642 ieee80211_add_scan(vap, rxchan, 1643 &scan, wh, subtype, rssi, nf); 1644 } else if (contbgscan(vap)) { 1645 ieee80211_bg_scan(vap, 0); 1646 } else if (startbgscan(vap)) { 1647 vap->iv_stats.is_scan_bg++; 1648 #if 0 1649 /* wakeup if we are sleeing */ 1650 ieee80211_set_pwrsave(vap, 0); 1651 #endif 1652 ieee80211_bg_scan(vap, 0); 1653 } 1654 1655 /* 1656 * Put the station to sleep if we haven't seen 1657 * traffic in a while. 1658 */ 1659 IEEE80211_LOCK(ic); 1660 ieee80211_sta_ps_timer_check(vap); 1661 IEEE80211_UNLOCK(ic); 1662 1663 /* 1664 * If we've had a channel width change (eg HT20<->HT40) 1665 * then schedule a delayed driver notification. 1666 */ 1667 if (ht_state_change) 1668 ieee80211_update_chw(ic); 1669 return; 1670 } 1671 /* 1672 * If scanning, just pass information to the scan module. 1673 */ 1674 if (ic->ic_flags & IEEE80211_F_SCAN) { 1675 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1676 /* 1677 * Actively scanning a channel marked passive; 1678 * send a probe request now that we know there 1679 * is 802.11 traffic present. 1680 * 1681 * XXX check if the beacon we recv'd gives 1682 * us what we need and suppress the probe req 1683 */ 1684 ieee80211_probe_curchan(vap, 1); 1685 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1686 } 1687 ieee80211_add_scan(vap, rxchan, &scan, wh, 1688 subtype, rssi, nf); 1689 return; 1690 } 1691 break; 1692 } 1693 1694 case IEEE80211_FC0_SUBTYPE_AUTH: { 1695 uint16_t algo, seq, status; 1696 /* 1697 * auth frame format 1698 * [2] algorithm 1699 * [2] sequence 1700 * [2] status 1701 * [tlv*] challenge 1702 */ 1703 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1704 algo = le16toh(*(uint16_t *)frm); 1705 seq = le16toh(*(uint16_t *)(frm + 2)); 1706 status = le16toh(*(uint16_t *)(frm + 4)); 1707 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1708 "recv auth frame with algorithm %d seq %d", algo, seq); 1709 1710 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1711 IEEE80211_DISCARD(vap, 1712 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1713 wh, "auth", "%s", "TKIP countermeasures enabled"); 1714 vap->iv_stats.is_rx_auth_countermeasures++; 1715 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1716 ieee80211_send_error(ni, wh->i_addr2, 1717 IEEE80211_FC0_SUBTYPE_AUTH, 1718 IEEE80211_REASON_MIC_FAILURE); 1719 } 1720 return; 1721 } 1722 if (algo == IEEE80211_AUTH_ALG_SHARED) 1723 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1724 seq, status); 1725 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1726 sta_auth_open(ni, wh, rssi, nf, seq, status); 1727 else { 1728 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1729 wh, "auth", "unsupported alg %d", algo); 1730 vap->iv_stats.is_rx_auth_unsupported++; 1731 return; 1732 } 1733 break; 1734 } 1735 1736 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1737 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1738 uint16_t capinfo, associd; 1739 uint16_t status; 1740 1741 if (vap->iv_state != IEEE80211_S_ASSOC) { 1742 vap->iv_stats.is_rx_mgtdiscard++; 1743 return; 1744 } 1745 1746 /* 1747 * asresp frame format 1748 * [2] capability information 1749 * [2] status 1750 * [2] association ID 1751 * [tlv] supported rates 1752 * [tlv] extended supported rates 1753 * [tlv] WME 1754 * [tlv] HT capabilities 1755 * [tlv] HT info 1756 */ 1757 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1758 ni = vap->iv_bss; 1759 capinfo = le16toh(*(uint16_t *)frm); 1760 frm += 2; 1761 status = le16toh(*(uint16_t *)frm); 1762 frm += 2; 1763 if (status != 0) { 1764 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1765 wh->i_addr2, "%sassoc failed (reason %d)", 1766 ISREASSOC(subtype) ? "re" : "", status); 1767 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1768 return; 1769 } 1770 associd = le16toh(*(uint16_t *)frm); 1771 frm += 2; 1772 1773 rates = xrates = wme = htcap = htinfo = NULL; 1774 vhtcap = vhtopmode = NULL; 1775 while (efrm - frm > 1) { 1776 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1777 switch (*frm) { 1778 case IEEE80211_ELEMID_RATES: 1779 rates = frm; 1780 break; 1781 case IEEE80211_ELEMID_XRATES: 1782 xrates = frm; 1783 break; 1784 case IEEE80211_ELEMID_HTCAP: 1785 htcap = frm; 1786 break; 1787 case IEEE80211_ELEMID_HTINFO: 1788 htinfo = frm; 1789 break; 1790 case IEEE80211_ELEMID_VENDOR: 1791 if (iswmeoui(frm)) 1792 wme = frm; 1793 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1794 /* 1795 * Accept pre-draft HT ie's if the 1796 * standard ones have not been seen. 1797 */ 1798 if (ishtcapoui(frm)) { 1799 if (htcap == NULL) 1800 htcap = frm; 1801 } else if (ishtinfooui(frm)) { 1802 if (htinfo == NULL) 1803 htinfo = frm; 1804 } 1805 } 1806 /* XXX Atheros OUI support */ 1807 break; 1808 case IEEE80211_ELEMID_VHT_CAP: 1809 vhtcap = frm; 1810 break; 1811 case IEEE80211_ELEMID_VHT_OPMODE: 1812 vhtopmode = frm; 1813 break; 1814 } 1815 frm += frm[1] + 2; 1816 } 1817 1818 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1819 if (xrates != NULL) 1820 IEEE80211_VERIFY_ELEMENT(xrates, 1821 IEEE80211_RATE_MAXSIZE - rates[1], return); 1822 rate = ieee80211_setup_rates(ni, rates, xrates, 1823 IEEE80211_F_JOIN | 1824 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1825 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1826 if (rate & IEEE80211_RATE_BASIC) { 1827 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1828 wh->i_addr2, 1829 "%sassoc failed (rate set mismatch)", 1830 ISREASSOC(subtype) ? "re" : ""); 1831 vap->iv_stats.is_rx_assoc_norate++; 1832 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1833 IEEE80211_SCAN_FAIL_STATUS); 1834 return; 1835 } 1836 1837 ni->ni_capinfo = capinfo; 1838 ni->ni_associd = associd; 1839 if (ni->ni_jointime == 0) 1840 ni->ni_jointime = time_uptime; 1841 if (wme != NULL && 1842 ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) { 1843 ni->ni_flags |= IEEE80211_NODE_QOS; 1844 ieee80211_wme_updateparams(vap); 1845 } else 1846 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1847 /* 1848 * Setup HT state according to the negotiation. 1849 * 1850 * NB: shouldn't need to check if HT use is enabled but some 1851 * ap's send back HT ie's even when we don't indicate we 1852 * are HT capable in our AssocReq. 1853 */ 1854 if (htcap != NULL && htinfo != NULL && 1855 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1856 ieee80211_ht_node_init(ni); 1857 ieee80211_ht_updateparams(ni, htcap, htinfo); 1858 1859 if ((vhtcap != NULL) && (vhtopmode != NULL) & 1860 (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) { 1861 /* 1862 * Log if we get a VHT assoc/reassoc response. 1863 * We aren't ready for 2GHz VHT support. 1864 */ 1865 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) { 1866 printf("%s: peer %6D: VHT on 2GHz, ignoring\n", 1867 __func__, 1868 ni->ni_macaddr, 1869 ":"); 1870 } else { 1871 ieee80211_vht_node_init(ni); 1872 ieee80211_vht_updateparams(ni, vhtcap, vhtopmode); 1873 ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode); 1874 } 1875 } 1876 1877 ieee80211_ht_updateparams_final(ni, htcap, htinfo); 1878 ieee80211_setup_htrates(ni, htcap, 1879 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1880 ieee80211_setup_basic_htrates(ni, htinfo); 1881 1882 ieee80211_node_setuptxparms(ni); 1883 ieee80211_ratectl_node_init(ni); 1884 } 1885 1886 /* 1887 * Always initialise FF/superg state; we can use this 1888 * for doing A-MSDU encapsulation as well. 1889 */ 1890 #ifdef IEEE80211_SUPPORT_SUPERG 1891 ieee80211_ff_node_init(ni); 1892 #endif 1893 1894 /* 1895 * Configure state now that we are associated. 1896 * 1897 * XXX may need different/additional driver callbacks? 1898 */ 1899 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1900 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1901 vap->iv_flags |= IEEE80211_F_SHPREAMBLE; 1902 vap->iv_flags &= ~IEEE80211_F_USEBARKER; 1903 } else { 1904 vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE; 1905 vap->iv_flags |= IEEE80211_F_USEBARKER; 1906 } 1907 ieee80211_vap_set_shortslottime(vap, 1908 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1909 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1910 ieee80211_vap_update_preamble(vap); 1911 /* 1912 * Honor ERP protection. 1913 * 1914 * NB: ni_erp should zero for non-11g operation. 1915 */ 1916 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1917 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1918 vap->iv_flags |= IEEE80211_F_USEPROT; 1919 else 1920 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1921 ieee80211_vap_update_erp_protmode(vap); 1922 IEEE80211_NOTE_MAC(vap, 1923 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1924 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s", 1925 ISREASSOC(subtype) ? "re" : "", 1926 IEEE80211_NODE_AID(ni), 1927 vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1928 vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1929 vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1930 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1931 ni->ni_flags & IEEE80211_NODE_HT ? 1932 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1933 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1934 ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "", 1935 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1936 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1937 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1938 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1939 ", fast-frames" : "", 1940 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1941 ", turbo" : "" 1942 ); 1943 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1944 break; 1945 } 1946 1947 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1948 uint16_t reason; 1949 1950 if (vap->iv_state == IEEE80211_S_SCAN) { 1951 vap->iv_stats.is_rx_mgtdiscard++; 1952 return; 1953 } 1954 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1955 /* NB: can happen when in promiscuous mode */ 1956 vap->iv_stats.is_rx_mgtdiscard++; 1957 break; 1958 } 1959 1960 /* 1961 * deauth frame format 1962 * [2] reason 1963 */ 1964 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1965 reason = le16toh(*(uint16_t *)frm); 1966 1967 vap->iv_stats.is_rx_deauth++; 1968 vap->iv_stats.is_rx_deauth_code = reason; 1969 IEEE80211_NODE_STAT(ni, rx_deauth); 1970 1971 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1972 "recv deauthenticate (reason: %d (%s))", reason, 1973 ieee80211_reason_to_string(reason)); 1974 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1975 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1976 break; 1977 } 1978 1979 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1980 uint16_t reason; 1981 1982 if (vap->iv_state != IEEE80211_S_RUN && 1983 vap->iv_state != IEEE80211_S_ASSOC && 1984 vap->iv_state != IEEE80211_S_AUTH) { 1985 vap->iv_stats.is_rx_mgtdiscard++; 1986 return; 1987 } 1988 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1989 /* NB: can happen when in promiscuous mode */ 1990 vap->iv_stats.is_rx_mgtdiscard++; 1991 break; 1992 } 1993 1994 /* 1995 * disassoc frame format 1996 * [2] reason 1997 */ 1998 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1999 reason = le16toh(*(uint16_t *)frm); 2000 2001 vap->iv_stats.is_rx_disassoc++; 2002 vap->iv_stats.is_rx_disassoc_code = reason; 2003 IEEE80211_NODE_STAT(ni, rx_disassoc); 2004 2005 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2006 "recv disassociate (reason: %d (%s))", reason, 2007 ieee80211_reason_to_string(reason)); 2008 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 2009 break; 2010 } 2011 2012 case IEEE80211_FC0_SUBTYPE_ACTION: 2013 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2014 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2015 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2016 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2017 wh, NULL, "%s", "not for us"); 2018 vap->iv_stats.is_rx_mgtdiscard++; 2019 } else if (vap->iv_state != IEEE80211_S_RUN) { 2020 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2021 wh, NULL, "wrong state %s", 2022 ieee80211_state_name[vap->iv_state]); 2023 vap->iv_stats.is_rx_mgtdiscard++; 2024 } else { 2025 if (ieee80211_parse_action(ni, m0) == 0) 2026 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2027 } 2028 break; 2029 2030 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2031 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2032 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2033 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 2034 case IEEE80211_FC0_SUBTYPE_ATIM: 2035 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2036 wh, NULL, "%s", "not handled"); 2037 vap->iv_stats.is_rx_mgtdiscard++; 2038 break; 2039 2040 default: 2041 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2042 wh, "mgt", "subtype 0x%x not handled", subtype); 2043 vap->iv_stats.is_rx_badsubtype++; 2044 break; 2045 } 2046 #undef ISREASSOC 2047 } 2048 2049 static void 2050 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2051 { 2052 switch (subtype) { 2053 case IEEE80211_FC0_SUBTYPE_BAR: 2054 ieee80211_recv_bar(ni, m); 2055 break; 2056 } 2057 } 2058