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); 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); 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 eh = mtod(m, struct ether_header *); 844 if (!ieee80211_node_is_authorized(ni)) { 845 /* 846 * Deny any non-PAE frames received prior to 847 * authorization. For open/shared-key 848 * authentication the port is mark authorized 849 * after authentication completes. For 802.1x 850 * the port is not marked authorized by the 851 * authenticator until the handshake has completed. 852 */ 853 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 854 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 855 eh->ether_shost, "data", 856 "unauthorized port: ether type 0x%x len %u", 857 eh->ether_type, m->m_pkthdr.len); 858 vap->iv_stats.is_rx_unauth++; 859 IEEE80211_NODE_STAT(ni, rx_unauth); 860 goto err; 861 } 862 } else { 863 /* 864 * When denying unencrypted frames, discard 865 * any non-PAE frames received without encryption. 866 */ 867 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 868 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 869 (is_hw_decrypted == 0) && 870 eh->ether_type != htons(ETHERTYPE_PAE)) { 871 /* 872 * Drop unencrypted frames. 873 */ 874 vap->iv_stats.is_rx_unencrypted++; 875 IEEE80211_NODE_STAT(ni, rx_unencrypted); 876 goto out; 877 } 878 } 879 /* XXX require HT? */ 880 if (qos & IEEE80211_QOS_AMSDU) { 881 m = ieee80211_decap_amsdu(ni, m); 882 if (m == NULL) 883 return IEEE80211_FC0_TYPE_DATA; 884 } else { 885 #ifdef IEEE80211_SUPPORT_SUPERG 886 m = ieee80211_decap_fastframe(vap, ni, m); 887 if (m == NULL) 888 return IEEE80211_FC0_TYPE_DATA; 889 #endif 890 } 891 ieee80211_deliver_data(vap, ni, m); 892 return IEEE80211_FC0_TYPE_DATA; 893 894 case IEEE80211_FC0_TYPE_MGT: 895 vap->iv_stats.is_rx_mgmt++; 896 IEEE80211_NODE_STAT(ni, rx_mgmt); 897 if (dir != IEEE80211_FC1_DIR_NODS) { 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 899 wh, "data", "incorrect dir 0x%x", dir); 900 vap->iv_stats.is_rx_wrongdir++; 901 goto err; 902 } 903 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 904 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 905 ni->ni_macaddr, "mgt", "too short: len %u", 906 m->m_pkthdr.len); 907 vap->iv_stats.is_rx_tooshort++; 908 goto out; 909 } 910 #ifdef IEEE80211_DEBUG 911 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 912 ieee80211_msg_dumppkts(vap)) { 913 if_printf(ifp, "received %s from %s rssi %d\n", 914 ieee80211_mgt_subtype_name(subtype), 915 ether_sprintf(wh->i_addr2), rssi); 916 } 917 #endif 918 919 /* 920 * Note: See above for hardware offload privacy requirements. 921 * It also applies here. 922 */ 923 924 /* 925 * Again, having encrypted flag set check would be good, but 926 * then we have to also handle crypto_decap() like above. 927 */ 928 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 929 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 930 /* 931 * Only shared key auth frames with a challenge 932 * should be encrypted, discard all others. 933 */ 934 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 935 wh, ieee80211_mgt_subtype_name(subtype), 936 "%s", "WEP set but not permitted"); 937 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 938 goto out; 939 } 940 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 941 /* 942 * Discard encrypted frames when privacy is off. 943 */ 944 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 945 wh, "mgt", "%s", "WEP set but PRIVACY off"); 946 vap->iv_stats.is_rx_noprivacy++; 947 goto out; 948 } 949 hdrspace = ieee80211_hdrspace(ic, wh); 950 951 /* 952 * Again, if IV/MIC was stripped, then this whole 953 * setup will fail. That's going to need some poking. 954 */ 955 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 956 /* NB: stats+msgs handled in crypto_decap */ 957 goto out; 958 } 959 has_decrypted = 1; 960 wh = mtod(m, struct ieee80211_frame *); 961 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 962 } 963 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 964 goto out; 965 966 case IEEE80211_FC0_TYPE_CTL: 967 vap->iv_stats.is_rx_ctl++; 968 IEEE80211_NODE_STAT(ni, rx_ctrl); 969 vap->iv_recv_ctl(ni, m, subtype); 970 goto out; 971 972 default: 973 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 974 wh, NULL, "bad frame type 0x%x", type); 975 /* should not come here */ 976 break; 977 } 978 err: 979 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 980 out: 981 if (m != NULL) { 982 if (need_tap && ieee80211_radiotap_active_vap(vap)) 983 ieee80211_radiotap_rx(vap, m); 984 m_freem(m); 985 } 986 return type; 987 } 988 989 static void 990 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 991 int rssi, int nf, uint16_t seq, uint16_t status) 992 { 993 struct ieee80211vap *vap = ni->ni_vap; 994 995 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 996 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 997 ni->ni_macaddr, "open auth", 998 "bad sta auth mode %u", ni->ni_authmode); 999 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 1000 return; 1001 } 1002 if (vap->iv_state != IEEE80211_S_AUTH || 1003 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1004 vap->iv_stats.is_rx_bad_auth++; 1005 return; 1006 } 1007 if (status != 0) { 1008 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1009 ni, "open auth failed (reason %d)", status); 1010 vap->iv_stats.is_rx_auth_fail++; 1011 vap->iv_stats.is_rx_authfail_code = status; 1012 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1013 IEEE80211_SCAN_FAIL_STATUS); 1014 } else 1015 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1016 } 1017 1018 static void 1019 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1020 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1021 uint16_t seq, uint16_t status) 1022 { 1023 struct ieee80211vap *vap = ni->ni_vap; 1024 uint8_t *challenge; 1025 1026 /* 1027 * NB: this can happen as we allow pre-shared key 1028 * authentication to be enabled w/o wep being turned 1029 * on so that configuration of these can be done 1030 * in any order. It may be better to enforce the 1031 * ordering in which case this check would just be 1032 * for sanity/consistency. 1033 */ 1034 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1035 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1036 ni->ni_macaddr, "shared key auth", 1037 "%s", " PRIVACY is disabled"); 1038 goto bad; 1039 } 1040 /* 1041 * Pre-shared key authentication is evil; accept 1042 * it only if explicitly configured (it is supported 1043 * mainly for compatibility with clients like OS X). 1044 */ 1045 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1046 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1047 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1048 ni->ni_macaddr, "shared key auth", 1049 "bad sta auth mode %u", ni->ni_authmode); 1050 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1051 goto bad; 1052 } 1053 1054 challenge = NULL; 1055 if (frm + 1 < efrm) { 1056 if ((frm[1] + 2) > (efrm - frm)) { 1057 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1058 ni->ni_macaddr, "shared key auth", 1059 "ie %d/%d too long", 1060 frm[0], (frm[1] + 2) - (efrm - frm)); 1061 vap->iv_stats.is_rx_bad_auth++; 1062 goto bad; 1063 } 1064 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1065 challenge = frm; 1066 frm += frm[1] + 2; 1067 } 1068 switch (seq) { 1069 case IEEE80211_AUTH_SHARED_CHALLENGE: 1070 case IEEE80211_AUTH_SHARED_RESPONSE: 1071 if (challenge == NULL) { 1072 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1073 ni->ni_macaddr, "shared key auth", 1074 "%s", "no challenge"); 1075 vap->iv_stats.is_rx_bad_auth++; 1076 goto bad; 1077 } 1078 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1079 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1080 ni->ni_macaddr, "shared key auth", 1081 "bad challenge len %d", challenge[1]); 1082 vap->iv_stats.is_rx_bad_auth++; 1083 goto bad; 1084 } 1085 default: 1086 break; 1087 } 1088 if (vap->iv_state != IEEE80211_S_AUTH) 1089 return; 1090 switch (seq) { 1091 case IEEE80211_AUTH_SHARED_PASS: 1092 if (ni->ni_challenge != NULL) { 1093 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1094 ni->ni_challenge = NULL; 1095 } 1096 if (status != 0) { 1097 IEEE80211_NOTE_FRAME(vap, 1098 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1099 "shared key auth failed (reason %d)", status); 1100 vap->iv_stats.is_rx_auth_fail++; 1101 vap->iv_stats.is_rx_authfail_code = status; 1102 return; 1103 } 1104 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1105 break; 1106 case IEEE80211_AUTH_SHARED_CHALLENGE: 1107 if (!ieee80211_alloc_challenge(ni)) 1108 return; 1109 /* XXX could optimize by passing recvd challenge */ 1110 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1111 IEEE80211_SEND_MGMT(ni, 1112 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1113 break; 1114 default: 1115 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1116 wh, "shared key auth", "bad seq %d", seq); 1117 vap->iv_stats.is_rx_bad_auth++; 1118 return; 1119 } 1120 return; 1121 bad: 1122 /* 1123 * Kick the state machine. This short-circuits 1124 * using the mgt frame timeout to trigger the 1125 * state transition. 1126 */ 1127 if (vap->iv_state == IEEE80211_S_AUTH) 1128 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1129 IEEE80211_SCAN_FAIL_STATUS); 1130 } 1131 1132 /* 1133 * Parse the WME IE for QoS and U-APSD information. 1134 * 1135 * Returns -1 if the IE isn't found, 1 if it's found. 1136 */ 1137 int 1138 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh, 1139 struct ieee80211_node *ni) 1140 { 1141 u_int len = frm[1]; 1142 1143 ni->ni_uapsd = 0; 1144 1145 if (len < sizeof(struct ieee80211_wme_param)-2) { 1146 IEEE80211_DISCARD_IE(ni->ni_vap, 1147 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1148 wh, "WME", "too short, len %u", len); 1149 return -1; 1150 } 1151 1152 ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET]; 1153 1154 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC, 1155 ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd); 1156 1157 return 1; 1158 } 1159 1160 int 1161 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1162 const struct ieee80211_frame *wh, uint8_t *qosinfo) 1163 { 1164 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1165 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1166 u_int len = frm[1], qosinfo_count; 1167 int i; 1168 1169 *qosinfo = 0; 1170 1171 if (len < sizeof(struct ieee80211_wme_param)-2) { 1172 IEEE80211_DISCARD_IE(vap, 1173 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1174 wh, "WME", "too short, len %u", len); 1175 return -1; 1176 } 1177 *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1178 qosinfo_count = *qosinfo & WME_QOSINFO_COUNT; 1179 1180 /* XXX do proper check for wraparound */ 1181 if (qosinfo_count == wme->wme_wmeChanParams.cap_info) 1182 return 0; 1183 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1184 for (i = 0; i < WME_NUM_AC; i++) { 1185 struct wmeParams *wmep = 1186 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1187 /* NB: ACI not used */ 1188 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1189 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1190 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1191 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1192 wmep->wmep_txopLimit = le16dec(frm+2); 1193 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 1194 "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n", 1195 __func__, 1196 i, 1197 wmep->wmep_acm, 1198 wmep->wmep_aifsn, 1199 wmep->wmep_logcwmin, 1200 wmep->wmep_logcwmax, 1201 wmep->wmep_txopLimit); 1202 frm += 4; 1203 } 1204 wme->wme_wmeChanParams.cap_info = qosinfo_count; 1205 return 1; 1206 #undef MS 1207 } 1208 1209 /* 1210 * Process 11h Channel Switch Announcement (CSA) ie. If this 1211 * is the first CSA then initiate the switch. Otherwise we 1212 * track state and trigger completion and/or cancel of the switch. 1213 * XXX should be public for IBSS use 1214 */ 1215 static void 1216 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1217 const struct ieee80211_frame *wh) 1218 { 1219 struct ieee80211com *ic = vap->iv_ic; 1220 const struct ieee80211_csa_ie *csa = 1221 (const struct ieee80211_csa_ie *) frm; 1222 1223 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1224 ("state %s", ieee80211_state_name[vap->iv_state])); 1225 1226 if (csa->csa_mode > 1) { 1227 IEEE80211_DISCARD_IE(vap, 1228 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1229 wh, "CSA", "invalid mode %u", csa->csa_mode); 1230 return; 1231 } 1232 IEEE80211_LOCK(ic); 1233 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1234 /* 1235 * Convert the channel number to a channel reference. We 1236 * try first to preserve turbo attribute of the current 1237 * channel then fallback. Note this will not work if the 1238 * CSA specifies a channel that requires a band switch (e.g. 1239 * 11a => 11g). This is intentional as 11h is defined only 1240 * for 5GHz/11a and because the switch does not involve a 1241 * reassociation, protocol state (capabilities, negotated 1242 * rates, etc) may/will be wrong. 1243 */ 1244 struct ieee80211_channel *c = 1245 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1246 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1247 if (c == NULL) { 1248 c = ieee80211_find_channel_byieee(ic, 1249 csa->csa_newchan, 1250 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1251 if (c == NULL) { 1252 IEEE80211_DISCARD_IE(vap, 1253 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1254 wh, "CSA", "invalid channel %u", 1255 csa->csa_newchan); 1256 goto done; 1257 } 1258 } 1259 #if IEEE80211_CSA_COUNT_MIN > 0 1260 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1261 /* 1262 * Require at least IEEE80211_CSA_COUNT_MIN count to 1263 * reduce the risk of being redirected by a fabricated 1264 * CSA. If a valid CSA is dropped we'll still get a 1265 * beacon miss when the AP leaves the channel so we'll 1266 * eventually follow to the new channel. 1267 * 1268 * NOTE: this violates the 11h spec that states that 1269 * count may be any value and if 0 then a switch 1270 * should happen asap. 1271 */ 1272 IEEE80211_DISCARD_IE(vap, 1273 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1274 wh, "CSA", "count %u too small, must be >= %u", 1275 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1276 goto done; 1277 } 1278 #endif 1279 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1280 } else { 1281 /* 1282 * Validate this ie against the initial CSA. We require 1283 * mode and channel not change and the count must be 1284 * monotonically decreasing. This may be pointless and 1285 * canceling the switch as a result may be too paranoid but 1286 * in the worst case if we drop out of CSA because of this 1287 * and the AP does move then we'll just end up taking a 1288 * beacon miss and scan to find the AP. 1289 * 1290 * XXX may want <= on count as we also process ProbeResp 1291 * frames and those may come in w/ the same count as the 1292 * previous beacon; but doing so leaves us open to a stuck 1293 * count until we add a dead-man timer 1294 */ 1295 if (!(csa->csa_count < ic->ic_csa_count && 1296 csa->csa_mode == ic->ic_csa_mode && 1297 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1298 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1299 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1300 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1301 ic->ic_csa_newchan, ic->ic_csa_count, 1302 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1303 ieee80211_csa_cancelswitch(ic); 1304 } else { 1305 if (csa->csa_count <= 1) 1306 ieee80211_csa_completeswitch(ic); 1307 else 1308 ic->ic_csa_count = csa->csa_count; 1309 } 1310 } 1311 done: 1312 IEEE80211_UNLOCK(ic); 1313 } 1314 1315 /* 1316 * Return non-zero if a background scan may be continued: 1317 * o bg scan is active 1318 * o no channel switch is pending 1319 * o there has not been any traffic recently 1320 * o no full-offload scan support (no need for explicitly continuing scan then) 1321 * 1322 * Note we do not check if there is an administrative enable; 1323 * this is only done to start the scan. We assume that any 1324 * change in state will be accompanied by a request to cancel 1325 * active scans which will otherwise cause this test to fail. 1326 */ 1327 static __inline int 1328 contbgscan(struct ieee80211vap *vap) 1329 { 1330 struct ieee80211com *ic = vap->iv_ic; 1331 1332 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1333 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1334 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) && 1335 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1336 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1337 } 1338 1339 /* 1340 * Return non-zero if a backgrond scan may be started: 1341 * o bg scanning is administratively enabled 1342 * o no channel switch is pending 1343 * o we are not boosted on a dynamic turbo channel 1344 * o there has not been a scan recently 1345 * o there has not been any traffic recently (don't check if full-offload scan) 1346 */ 1347 static __inline int 1348 startbgscan(struct ieee80211vap *vap) 1349 { 1350 struct ieee80211com *ic = vap->iv_ic; 1351 1352 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1353 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1354 #ifdef IEEE80211_SUPPORT_SUPERG 1355 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1356 #endif 1357 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1358 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) || 1359 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))); 1360 } 1361 1362 #ifdef notyet 1363 /* 1364 * Compare two quiet IEs and return if they are equivalent. 1365 * 1366 * The tbttcount isnt checked - that's not part of the configuration. 1367 */ 1368 static int 1369 compare_quiet_ie(const struct ieee80211_quiet_ie *q1, 1370 const struct ieee80211_quiet_ie *q2) 1371 { 1372 1373 if (q1->period != q2->period) 1374 return (0); 1375 if (le16dec(&q1->duration) != le16dec(&q2->duration)) 1376 return (0); 1377 if (le16dec(&q1->offset) != le16dec(&q2->offset)) 1378 return (0); 1379 return (1); 1380 } 1381 #endif 1382 1383 static void 1384 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1385 const struct ieee80211_rx_stats *rxs, 1386 int rssi, int nf) 1387 { 1388 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1389 struct ieee80211vap *vap = ni->ni_vap; 1390 struct ieee80211com *ic = ni->ni_ic; 1391 struct ieee80211_channel *rxchan = ic->ic_curchan; 1392 struct ieee80211_frame *wh; 1393 int ht_state_change = 0, do_ht = 0; 1394 uint8_t *frm, *efrm; 1395 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1396 uint8_t *vhtcap, *vhtopmode; 1397 uint8_t rate; 1398 uint8_t qosinfo; 1399 1400 wh = mtod(m0, struct ieee80211_frame *); 1401 frm = (uint8_t *)&wh[1]; 1402 efrm = mtod(m0, uint8_t *) + m0->m_len; 1403 switch (subtype) { 1404 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1405 case IEEE80211_FC0_SUBTYPE_BEACON: { 1406 struct ieee80211_scanparams scan; 1407 struct ieee80211_channel *c; 1408 /* 1409 * We process beacon/probe response frames: 1410 * o when scanning, or 1411 * o station mode when associated (to collect state 1412 * updates such as 802.11g slot time) 1413 * Frames otherwise received are discarded. 1414 */ 1415 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1416 vap->iv_stats.is_rx_mgtdiscard++; 1417 return; 1418 } 1419 1420 /* Override RX channel as appropriate */ 1421 if (rxs != NULL) { 1422 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1423 if (c != NULL) 1424 rxchan = c; 1425 } 1426 1427 /* XXX probe response in sta mode when !scanning? */ 1428 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1429 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1430 vap->iv_stats.is_beacon_bad++; 1431 return; 1432 } 1433 1434 /* 1435 * Count frame now that we know it's to be processed. 1436 */ 1437 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1438 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1439 IEEE80211_NODE_STAT(ni, rx_beacons); 1440 } else 1441 IEEE80211_NODE_STAT(ni, rx_proberesp); 1442 /* 1443 * When operating in station mode, check for state updates. 1444 * Be careful to ignore beacons received while doing a 1445 * background scan. We consider only 11g/WMM stuff right now. 1446 */ 1447 if (ni->ni_associd != 0 && 1448 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1449 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1450 /* record tsf of last beacon */ 1451 memcpy(ni->ni_tstamp.data, scan.tstamp, 1452 sizeof(ni->ni_tstamp)); 1453 /* count beacon frame for s/w bmiss handling */ 1454 vap->iv_swbmiss_count++; 1455 vap->iv_bmiss_count = 0; 1456 if (ni->ni_erp != scan.erp) { 1457 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1458 wh->i_addr2, 1459 "erp change: was 0x%x, now 0x%x", 1460 ni->ni_erp, scan.erp); 1461 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1462 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1463 vap->iv_flags |= IEEE80211_F_USEPROT; 1464 else 1465 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1466 ni->ni_erp = scan.erp; 1467 /* XXX statistic */ 1468 /* driver notification */ 1469 ieee80211_vap_update_erp_protmode(vap); 1470 } 1471 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1472 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1473 wh->i_addr2, 1474 "capabilities change: was 0x%x, now 0x%x", 1475 ni->ni_capinfo, scan.capinfo); 1476 /* 1477 * NB: we assume short preamble doesn't 1478 * change dynamically 1479 */ 1480 ieee80211_vap_set_shortslottime(vap, 1481 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1482 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1483 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1484 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1485 /* XXX statistic */ 1486 } 1487 if (scan.wme != NULL && 1488 (ni->ni_flags & IEEE80211_NODE_QOS)) { 1489 int _retval; 1490 if ((_retval = ieee80211_parse_wmeparams(vap, 1491 scan.wme, wh, &qosinfo)) >= 0) { 1492 if (qosinfo & WME_CAPINFO_UAPSD_EN) 1493 ni->ni_flags |= 1494 IEEE80211_NODE_UAPSD; 1495 if (_retval > 0) 1496 ieee80211_wme_updateparams(vap); 1497 } 1498 } else 1499 ni->ni_flags &= ~IEEE80211_NODE_UAPSD; 1500 #ifdef IEEE80211_SUPPORT_SUPERG 1501 if (scan.ath != NULL) 1502 ieee80211_parse_athparams(ni, scan.ath, wh); 1503 #endif 1504 if (scan.htcap != NULL && scan.htinfo != NULL && 1505 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1506 /* XXX state changes? */ 1507 ieee80211_ht_updateparams(ni, 1508 scan.htcap, scan.htinfo); 1509 do_ht = 1; 1510 } 1511 if (scan.vhtcap != NULL && scan.vhtopmode != NULL && 1512 (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) { 1513 /* XXX state changes? */ 1514 ieee80211_vht_updateparams(ni, 1515 scan.vhtcap, scan.vhtopmode); 1516 do_ht = 1; 1517 } 1518 if (do_ht) { 1519 if (ieee80211_ht_updateparams_final(ni, 1520 scan.htcap, scan.htinfo)) 1521 ht_state_change = 1; 1522 } 1523 1524 /* 1525 * If we have a quiet time IE then report it up to 1526 * the driver. 1527 * 1528 * Otherwise, inform the driver that the quiet time 1529 * IE has disappeared - only do that once rather than 1530 * spamming it each time. 1531 */ 1532 if (scan.quiet) { 1533 ic->ic_set_quiet(ni, scan.quiet); 1534 ni->ni_quiet_ie_set = 1; 1535 memcpy(&ni->ni_quiet_ie, scan.quiet, 1536 sizeof(struct ieee80211_quiet_ie)); 1537 } else { 1538 if (ni->ni_quiet_ie_set == 1) 1539 ic->ic_set_quiet(ni, NULL); 1540 ni->ni_quiet_ie_set = 0; 1541 bzero(&ni->ni_quiet_ie, 1542 sizeof(struct ieee80211_quiet_ie)); 1543 } 1544 1545 if (scan.tim != NULL) { 1546 struct ieee80211_tim_ie *tim = 1547 (struct ieee80211_tim_ie *) scan.tim; 1548 /* 1549 * XXX Check/debug this code; see if it's about 1550 * the right time to force the VAP awake if we 1551 * receive a frame destined for us? 1552 */ 1553 int aid = IEEE80211_AID(ni->ni_associd); 1554 int ix = aid / NBBY; 1555 int min = tim->tim_bitctl &~ 1; 1556 int max = tim->tim_len + min - 4; 1557 int tim_ucast = 0, tim_mcast = 0; 1558 1559 /* 1560 * Only do this for unicast traffic in the TIM 1561 * The multicast traffic notification for 1562 * the scan notification stuff should occur 1563 * differently. 1564 */ 1565 if (min <= ix && ix <= max && 1566 isset(tim->tim_bitmap - min, aid)) { 1567 tim_ucast = 1; 1568 } 1569 1570 /* 1571 * Do a separate notification 1572 * for the multicast bit being set. 1573 */ 1574 if (tim->tim_bitctl & 1) { 1575 tim_mcast = 1; 1576 } 1577 1578 /* 1579 * If the TIM indicates there's traffic for 1580 * us then get us out of STA mode powersave. 1581 */ 1582 if (tim_ucast == 1) { 1583 1584 /* 1585 * Wake us out of SLEEP state if we're 1586 * in it; and if we're doing bgscan 1587 * then wake us out of STA powersave. 1588 */ 1589 ieee80211_sta_tim_notify(vap, 1); 1590 1591 /* 1592 * This is preventing us from 1593 * continuing a bgscan; because it 1594 * tricks the contbgscan() 1595 * routine to think there's always 1596 * traffic for us. 1597 * 1598 * I think we need both an RX and 1599 * TX ic_lastdata field. 1600 */ 1601 ic->ic_lastdata = ticks; 1602 } 1603 1604 ni->ni_dtim_count = tim->tim_count; 1605 ni->ni_dtim_period = tim->tim_period; 1606 } 1607 if (scan.csa != NULL && 1608 (vap->iv_flags & IEEE80211_F_DOTH)) 1609 ieee80211_parse_csaparams(vap, scan.csa, wh); 1610 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1611 /* 1612 * No CSA ie or 11h disabled, but a channel 1613 * switch is pending; drop out so we aren't 1614 * stuck in CSA state. If the AP really is 1615 * moving we'll get a beacon miss and scan. 1616 */ 1617 IEEE80211_LOCK(ic); 1618 ieee80211_csa_cancelswitch(ic); 1619 IEEE80211_UNLOCK(ic); 1620 } 1621 /* 1622 * If scanning, pass the info to the scan module. 1623 * Otherwise, check if it's the right time to do 1624 * a background scan. Background scanning must 1625 * be enabled and we must not be operating in the 1626 * turbo phase of dynamic turbo mode. Then, 1627 * it's been a while since the last background 1628 * scan and if no data frames have come through 1629 * recently, kick off a scan. Note that this 1630 * is the mechanism by which a background scan 1631 * is started _and_ continued each time we 1632 * return on-channel to receive a beacon from 1633 * our ap. 1634 */ 1635 if (ic->ic_flags & IEEE80211_F_SCAN) { 1636 ieee80211_add_scan(vap, rxchan, 1637 &scan, wh, subtype, rssi, nf); 1638 } else if (contbgscan(vap)) { 1639 ieee80211_bg_scan(vap, 0); 1640 } else if (startbgscan(vap)) { 1641 vap->iv_stats.is_scan_bg++; 1642 #if 0 1643 /* wakeup if we are sleeing */ 1644 ieee80211_set_pwrsave(vap, 0); 1645 #endif 1646 ieee80211_bg_scan(vap, 0); 1647 } 1648 1649 /* 1650 * Put the station to sleep if we haven't seen 1651 * traffic in a while. 1652 */ 1653 IEEE80211_LOCK(ic); 1654 ieee80211_sta_ps_timer_check(vap); 1655 IEEE80211_UNLOCK(ic); 1656 1657 /* 1658 * If we've had a channel width change (eg HT20<->HT40) 1659 * then schedule a delayed driver notification. 1660 */ 1661 if (ht_state_change) 1662 ieee80211_update_chw(ic); 1663 return; 1664 } 1665 /* 1666 * If scanning, just pass information to the scan module. 1667 */ 1668 if (ic->ic_flags & IEEE80211_F_SCAN) { 1669 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1670 /* 1671 * Actively scanning a channel marked passive; 1672 * send a probe request now that we know there 1673 * is 802.11 traffic present. 1674 * 1675 * XXX check if the beacon we recv'd gives 1676 * us what we need and suppress the probe req 1677 */ 1678 ieee80211_probe_curchan(vap, 1); 1679 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1680 } 1681 ieee80211_add_scan(vap, rxchan, &scan, wh, 1682 subtype, rssi, nf); 1683 return; 1684 } 1685 break; 1686 } 1687 1688 case IEEE80211_FC0_SUBTYPE_AUTH: { 1689 uint16_t algo, seq, status; 1690 /* 1691 * auth frame format 1692 * [2] algorithm 1693 * [2] sequence 1694 * [2] status 1695 * [tlv*] challenge 1696 */ 1697 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1698 algo = le16toh(*(uint16_t *)frm); 1699 seq = le16toh(*(uint16_t *)(frm + 2)); 1700 status = le16toh(*(uint16_t *)(frm + 4)); 1701 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1702 "recv auth frame with algorithm %d seq %d", algo, seq); 1703 1704 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1705 IEEE80211_DISCARD(vap, 1706 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1707 wh, "auth", "%s", "TKIP countermeasures enabled"); 1708 vap->iv_stats.is_rx_auth_countermeasures++; 1709 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1710 ieee80211_send_error(ni, wh->i_addr2, 1711 IEEE80211_FC0_SUBTYPE_AUTH, 1712 IEEE80211_REASON_MIC_FAILURE); 1713 } 1714 return; 1715 } 1716 if (algo == IEEE80211_AUTH_ALG_SHARED) 1717 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1718 seq, status); 1719 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1720 sta_auth_open(ni, wh, rssi, nf, seq, status); 1721 else { 1722 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1723 wh, "auth", "unsupported alg %d", algo); 1724 vap->iv_stats.is_rx_auth_unsupported++; 1725 return; 1726 } 1727 break; 1728 } 1729 1730 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1731 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1732 uint16_t capinfo, associd; 1733 uint16_t status; 1734 1735 if (vap->iv_state != IEEE80211_S_ASSOC) { 1736 vap->iv_stats.is_rx_mgtdiscard++; 1737 return; 1738 } 1739 1740 /* 1741 * asresp frame format 1742 * [2] capability information 1743 * [2] status 1744 * [2] association ID 1745 * [tlv] supported rates 1746 * [tlv] extended supported rates 1747 * [tlv] WME 1748 * [tlv] HT capabilities 1749 * [tlv] HT info 1750 */ 1751 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1752 ni = vap->iv_bss; 1753 capinfo = le16toh(*(uint16_t *)frm); 1754 frm += 2; 1755 status = le16toh(*(uint16_t *)frm); 1756 frm += 2; 1757 if (status != 0) { 1758 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1759 wh->i_addr2, "%sassoc failed (reason %d)", 1760 ISREASSOC(subtype) ? "re" : "", status); 1761 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1762 return; 1763 } 1764 associd = le16toh(*(uint16_t *)frm); 1765 frm += 2; 1766 1767 rates = xrates = wme = htcap = htinfo = NULL; 1768 vhtcap = vhtopmode = NULL; 1769 while (efrm - frm > 1) { 1770 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1771 switch (*frm) { 1772 case IEEE80211_ELEMID_RATES: 1773 rates = frm; 1774 break; 1775 case IEEE80211_ELEMID_XRATES: 1776 xrates = frm; 1777 break; 1778 case IEEE80211_ELEMID_HTCAP: 1779 htcap = frm; 1780 break; 1781 case IEEE80211_ELEMID_HTINFO: 1782 htinfo = frm; 1783 break; 1784 case IEEE80211_ELEMID_VENDOR: 1785 if (iswmeoui(frm)) 1786 wme = frm; 1787 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1788 /* 1789 * Accept pre-draft HT ie's if the 1790 * standard ones have not been seen. 1791 */ 1792 if (ishtcapoui(frm)) { 1793 if (htcap == NULL) 1794 htcap = frm; 1795 } else if (ishtinfooui(frm)) { 1796 if (htinfo == NULL) 1797 htinfo = frm; 1798 } 1799 } 1800 /* XXX Atheros OUI support */ 1801 break; 1802 case IEEE80211_ELEMID_VHT_CAP: 1803 vhtcap = frm; 1804 break; 1805 case IEEE80211_ELEMID_VHT_OPMODE: 1806 vhtopmode = frm; 1807 break; 1808 } 1809 frm += frm[1] + 2; 1810 } 1811 1812 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1813 if (xrates != NULL) 1814 IEEE80211_VERIFY_ELEMENT(xrates, 1815 IEEE80211_RATE_MAXSIZE - rates[1], return); 1816 rate = ieee80211_setup_rates(ni, rates, xrates, 1817 IEEE80211_F_JOIN | 1818 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1819 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1820 if (rate & IEEE80211_RATE_BASIC) { 1821 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1822 wh->i_addr2, 1823 "%sassoc failed (rate set mismatch)", 1824 ISREASSOC(subtype) ? "re" : ""); 1825 vap->iv_stats.is_rx_assoc_norate++; 1826 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1827 IEEE80211_SCAN_FAIL_STATUS); 1828 return; 1829 } 1830 1831 ni->ni_capinfo = capinfo; 1832 ni->ni_associd = associd; 1833 if (ni->ni_jointime == 0) 1834 ni->ni_jointime = time_uptime; 1835 if (wme != NULL && 1836 ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) { 1837 ni->ni_flags |= IEEE80211_NODE_QOS; 1838 ieee80211_wme_updateparams(vap); 1839 } else 1840 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1841 /* 1842 * Setup HT state according to the negotiation. 1843 * 1844 * NB: shouldn't need to check if HT use is enabled but some 1845 * ap's send back HT ie's even when we don't indicate we 1846 * are HT capable in our AssocReq. 1847 */ 1848 if (htcap != NULL && htinfo != NULL && 1849 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1850 ieee80211_ht_node_init(ni); 1851 ieee80211_ht_updateparams(ni, htcap, htinfo); 1852 1853 if ((vhtcap != NULL) && (vhtopmode != NULL) & 1854 (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) { 1855 /* 1856 * Log if we get a VHT assoc/reassoc response. 1857 * We aren't ready for 2GHz VHT support. 1858 */ 1859 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) { 1860 printf("%s: peer %6D: VHT on 2GHz, ignoring\n", 1861 __func__, 1862 ni->ni_macaddr, 1863 ":"); 1864 } else { 1865 ieee80211_vht_node_init(ni); 1866 ieee80211_vht_updateparams(ni, vhtcap, vhtopmode); 1867 ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode); 1868 } 1869 } 1870 1871 ieee80211_ht_updateparams_final(ni, htcap, htinfo); 1872 ieee80211_setup_htrates(ni, htcap, 1873 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1874 ieee80211_setup_basic_htrates(ni, htinfo); 1875 1876 ieee80211_node_setuptxparms(ni); 1877 ieee80211_ratectl_node_init(ni); 1878 } 1879 1880 /* 1881 * Always initialise FF/superg state; we can use this 1882 * for doing A-MSDU encapsulation as well. 1883 */ 1884 #ifdef IEEE80211_SUPPORT_SUPERG 1885 ieee80211_ff_node_init(ni); 1886 #endif 1887 1888 /* 1889 * Configure state now that we are associated. 1890 * 1891 * XXX may need different/additional driver callbacks? 1892 */ 1893 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1894 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1895 vap->iv_flags |= IEEE80211_F_SHPREAMBLE; 1896 vap->iv_flags &= ~IEEE80211_F_USEBARKER; 1897 } else { 1898 vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE; 1899 vap->iv_flags |= IEEE80211_F_USEBARKER; 1900 } 1901 ieee80211_vap_set_shortslottime(vap, 1902 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1903 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1904 ieee80211_vap_update_preamble(vap); 1905 /* 1906 * Honor ERP protection. 1907 * 1908 * NB: ni_erp should zero for non-11g operation. 1909 */ 1910 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1911 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1912 vap->iv_flags |= IEEE80211_F_USEPROT; 1913 else 1914 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1915 ieee80211_vap_update_erp_protmode(vap); 1916 IEEE80211_NOTE_MAC(vap, 1917 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1918 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s", 1919 ISREASSOC(subtype) ? "re" : "", 1920 IEEE80211_NODE_AID(ni), 1921 vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1922 vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1923 vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1924 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1925 ni->ni_flags & IEEE80211_NODE_HT ? 1926 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1927 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1928 ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "", 1929 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1930 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1931 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1932 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1933 ", fast-frames" : "", 1934 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1935 ", turbo" : "" 1936 ); 1937 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1938 break; 1939 } 1940 1941 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1942 uint16_t reason; 1943 1944 if (vap->iv_state == IEEE80211_S_SCAN) { 1945 vap->iv_stats.is_rx_mgtdiscard++; 1946 return; 1947 } 1948 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1949 /* NB: can happen when in promiscuous mode */ 1950 vap->iv_stats.is_rx_mgtdiscard++; 1951 break; 1952 } 1953 1954 /* 1955 * deauth frame format 1956 * [2] reason 1957 */ 1958 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1959 reason = le16toh(*(uint16_t *)frm); 1960 1961 vap->iv_stats.is_rx_deauth++; 1962 vap->iv_stats.is_rx_deauth_code = reason; 1963 IEEE80211_NODE_STAT(ni, rx_deauth); 1964 1965 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1966 "recv deauthenticate (reason: %d (%s))", reason, 1967 ieee80211_reason_to_string(reason)); 1968 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1969 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1970 break; 1971 } 1972 1973 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1974 uint16_t reason; 1975 1976 if (vap->iv_state != IEEE80211_S_RUN && 1977 vap->iv_state != IEEE80211_S_ASSOC && 1978 vap->iv_state != IEEE80211_S_AUTH) { 1979 vap->iv_stats.is_rx_mgtdiscard++; 1980 return; 1981 } 1982 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1983 /* NB: can happen when in promiscuous mode */ 1984 vap->iv_stats.is_rx_mgtdiscard++; 1985 break; 1986 } 1987 1988 /* 1989 * disassoc frame format 1990 * [2] reason 1991 */ 1992 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1993 reason = le16toh(*(uint16_t *)frm); 1994 1995 vap->iv_stats.is_rx_disassoc++; 1996 vap->iv_stats.is_rx_disassoc_code = reason; 1997 IEEE80211_NODE_STAT(ni, rx_disassoc); 1998 1999 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2000 "recv disassociate (reason: %d (%s))", reason, 2001 ieee80211_reason_to_string(reason)); 2002 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 2003 break; 2004 } 2005 2006 case IEEE80211_FC0_SUBTYPE_ACTION: 2007 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2008 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2009 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2010 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2011 wh, NULL, "%s", "not for us"); 2012 vap->iv_stats.is_rx_mgtdiscard++; 2013 } else if (vap->iv_state != IEEE80211_S_RUN) { 2014 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2015 wh, NULL, "wrong state %s", 2016 ieee80211_state_name[vap->iv_state]); 2017 vap->iv_stats.is_rx_mgtdiscard++; 2018 } else { 2019 if (ieee80211_parse_action(ni, m0) == 0) 2020 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2021 } 2022 break; 2023 2024 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2025 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2026 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2027 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 2028 case IEEE80211_FC0_SUBTYPE_ATIM: 2029 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2030 wh, NULL, "%s", "not handled"); 2031 vap->iv_stats.is_rx_mgtdiscard++; 2032 break; 2033 2034 default: 2035 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2036 wh, "mgt", "subtype 0x%x not handled", subtype); 2037 vap->iv_stats.is_rx_badsubtype++; 2038 break; 2039 } 2040 #undef ISREASSOC 2041 } 2042 2043 static void 2044 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2045 { 2046 switch (subtype) { 2047 case IEEE80211_FC0_SUBTYPE_BAR: 2048 ieee80211_recv_bar(ni, m); 2049 break; 2050 } 2051 } 2052