1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 /* 29 * IEEE 802.11 Station mode support. 30 */ 31 #include "opt_inet.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_media.h> 49 #include <net/if_llc.h> 50 #include <net/if_dl.h> 51 #include <net/if_var.h> 52 #include <net/if_private.h> 53 #include <net/ethernet.h> 54 55 #include <net/bpf.h> 56 57 #include <net80211/ieee80211_var.h> 58 #include <net80211/ieee80211_sta.h> 59 #include <net80211/ieee80211_input.h> 60 #ifdef IEEE80211_SUPPORT_SUPERG 61 #include <net80211/ieee80211_superg.h> 62 #endif 63 #include <net80211/ieee80211_ratectl.h> 64 #include <net80211/ieee80211_sta.h> 65 #include <net80211/ieee80211_vht.h> 66 67 static void sta_vattach(struct ieee80211vap *); 68 static void sta_beacon_miss(struct ieee80211vap *); 69 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int sta_input(struct ieee80211_node *, struct mbuf *, 71 const struct ieee80211_rx_stats *, int, int); 72 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 73 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 74 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 75 76 void 77 ieee80211_sta_attach(struct ieee80211com *ic) 78 { 79 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 80 } 81 82 void 83 ieee80211_sta_detach(struct ieee80211com *ic) 84 { 85 } 86 87 static void 88 sta_vdetach(struct ieee80211vap *vap) 89 { 90 } 91 92 static void 93 sta_vattach(struct ieee80211vap *vap) 94 { 95 vap->iv_newstate = sta_newstate; 96 vap->iv_input = sta_input; 97 vap->iv_recv_mgmt = sta_recv_mgmt; 98 vap->iv_recv_ctl = sta_recv_ctl; 99 vap->iv_opdetach = sta_vdetach; 100 vap->iv_bmiss = sta_beacon_miss; 101 } 102 103 /* 104 * Handle a beacon miss event. The common code filters out 105 * spurious events that can happen when scanning and/or before 106 * reaching RUN state. 107 */ 108 static void 109 sta_beacon_miss(struct ieee80211vap *vap) 110 { 111 struct ieee80211com *ic = vap->iv_ic; 112 113 IEEE80211_LOCK_ASSERT(ic); 114 115 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 116 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 117 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 118 119 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 120 "beacon miss, mode %s state %s\n", 121 ieee80211_opmode_name[vap->iv_opmode], 122 ieee80211_state_name[vap->iv_state]); 123 124 if (vap->iv_state == IEEE80211_S_CSA) { 125 /* 126 * A Channel Switch is pending; assume we missed the 127 * beacon that would've completed the process and just 128 * force the switch. If we made a mistake we'll not 129 * find the AP on the new channel and fall back to a 130 * normal scan. 131 */ 132 ieee80211_csa_completeswitch(ic); 133 return; 134 } 135 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 136 /* 137 * Send a directed probe req before falling back to a 138 * scan; if we receive a response ic_bmiss_count will 139 * be reset. Some cards mistakenly report beacon miss 140 * so this avoids the expensive scan if the ap is 141 * still there. 142 */ 143 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 144 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 145 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 146 return; 147 } 148 149 callout_stop(&vap->iv_swbmiss); 150 vap->iv_bmiss_count = 0; 151 vap->iv_stats.is_beacon_miss++; 152 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 153 #ifdef IEEE80211_SUPPORT_SUPERG 154 155 /* 156 * If we receive a beacon miss interrupt when using 157 * dynamic turbo, attempt to switch modes before 158 * reassociating. 159 */ 160 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 161 ieee80211_dturbo_switch(vap, 162 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 163 #endif 164 /* 165 * Try to reassociate before scanning for a new ap. 166 */ 167 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 168 } else { 169 /* 170 * Somebody else is controlling state changes (e.g. 171 * a user-mode app) don't do anything that would 172 * confuse them; just drop into scan mode so they'll 173 * notified of the state change and given control. 174 */ 175 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 176 } 177 } 178 179 /* 180 * Handle deauth with reason. We retry only for 181 * the cases where we might succeed. Otherwise 182 * we downgrade the ap and scan. 183 */ 184 static void 185 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 186 { 187 switch (reason) { 188 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 189 case IEEE80211_STATUS_TIMEOUT: 190 case IEEE80211_REASON_ASSOC_EXPIRE: 191 case IEEE80211_REASON_NOT_AUTHED: 192 case IEEE80211_REASON_NOT_ASSOCED: 193 case IEEE80211_REASON_ASSOC_LEAVE: 194 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 195 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 196 break; 197 default: 198 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 199 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 200 ieee80211_check_scan_current(vap); 201 break; 202 } 203 } 204 205 static void 206 sta_swbmiss_start(struct ieee80211vap *vap) 207 { 208 209 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) { 210 /* 211 * Start s/w beacon miss timer for devices w/o 212 * hardware support. We fudge a bit here since 213 * we're doing this in software. 214 */ 215 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 216 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval); 217 vap->iv_swbmiss_count = 0; 218 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 219 ieee80211_swbmiss, vap); 220 } 221 } 222 223 /* 224 * IEEE80211_M_STA vap state machine handler. 225 * This routine handles the main states in the 802.11 protocol. 226 */ 227 static int 228 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 229 { 230 struct ieee80211com *ic = vap->iv_ic; 231 struct ieee80211_node *ni; 232 enum ieee80211_state ostate; 233 234 IEEE80211_LOCK_ASSERT(ic); 235 236 ostate = vap->iv_state; 237 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 238 __func__, ieee80211_state_name[ostate], 239 ieee80211_state_name[nstate], arg); 240 vap->iv_state = nstate; /* state transition */ 241 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 242 if (ostate != IEEE80211_S_SCAN) 243 ieee80211_cancel_scan(vap); /* background scan */ 244 ni = vap->iv_bss; /* NB: no reference held */ 245 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 246 callout_stop(&vap->iv_swbmiss); 247 switch (nstate) { 248 case IEEE80211_S_INIT: 249 switch (ostate) { 250 case IEEE80211_S_SLEEP: 251 /* XXX wakeup */ 252 /* XXX driver hook to wakeup the hardware? */ 253 case IEEE80211_S_RUN: 254 IEEE80211_SEND_MGMT(ni, 255 IEEE80211_FC0_SUBTYPE_DISASSOC, 256 IEEE80211_REASON_ASSOC_LEAVE); 257 ieee80211_sta_leave(ni); 258 break; 259 case IEEE80211_S_ASSOC: 260 IEEE80211_SEND_MGMT(ni, 261 IEEE80211_FC0_SUBTYPE_DEAUTH, 262 IEEE80211_REASON_AUTH_LEAVE); 263 break; 264 case IEEE80211_S_SCAN: 265 ieee80211_cancel_scan(vap); 266 break; 267 default: 268 break; 269 } 270 if (ostate != IEEE80211_S_INIT) { 271 /* NB: optimize INIT -> INIT case */ 272 ieee80211_reset_bss(vap); 273 } 274 if (vap->iv_auth->ia_detach != NULL) 275 vap->iv_auth->ia_detach(vap); 276 break; 277 case IEEE80211_S_SCAN: 278 switch (ostate) { 279 case IEEE80211_S_INIT: 280 /* 281 * Initiate a scan. We can come here as a result 282 * of an IEEE80211_IOC_SCAN_REQ too in which case 283 * the vap will be marked with IEEE80211_FEXT_SCANREQ 284 * and the scan request parameters will be present 285 * in iv_scanreq. Otherwise we do the default. 286 */ 287 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 288 ieee80211_check_scan(vap, 289 vap->iv_scanreq_flags, 290 vap->iv_scanreq_duration, 291 vap->iv_scanreq_mindwell, 292 vap->iv_scanreq_maxdwell, 293 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 294 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 295 } else 296 ieee80211_check_scan_current(vap); 297 break; 298 case IEEE80211_S_SCAN: 299 case IEEE80211_S_AUTH: 300 case IEEE80211_S_ASSOC: 301 /* 302 * These can happen either because of a timeout 303 * on an assoc/auth response or because of a 304 * change in state that requires a reset. For 305 * the former we're called with a non-zero arg 306 * that is the cause for the failure; pass this 307 * to the scan code so it can update state. 308 * Otherwise trigger a new scan unless we're in 309 * manual roaming mode in which case an application 310 * must issue an explicit scan request. 311 */ 312 if (arg != 0) 313 ieee80211_scan_assoc_fail(vap, 314 vap->iv_bss->ni_macaddr, arg); 315 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 316 ieee80211_check_scan_current(vap); 317 break; 318 case IEEE80211_S_SLEEP: /* beacon miss */ 319 /* 320 * XXX if in sleep we need to wakeup the hardware. 321 */ 322 /* FALLTHROUGH */ 323 case IEEE80211_S_RUN: /* beacon miss */ 324 /* 325 * Beacon miss. Notify user space and if not 326 * under control of a user application (roaming 327 * manual) kick off a scan to re-connect. 328 */ 329 330 ieee80211_sta_leave(ni); 331 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 332 ieee80211_check_scan_current(vap); 333 break; 334 default: 335 goto invalid; 336 } 337 break; 338 case IEEE80211_S_AUTH: 339 switch (ostate) { 340 case IEEE80211_S_INIT: 341 case IEEE80211_S_SCAN: 342 IEEE80211_SEND_MGMT(ni, 343 IEEE80211_FC0_SUBTYPE_AUTH, 1); 344 break; 345 case IEEE80211_S_AUTH: 346 case IEEE80211_S_ASSOC: 347 switch (arg & 0xff) { 348 case IEEE80211_FC0_SUBTYPE_AUTH: 349 /* ??? */ 350 IEEE80211_SEND_MGMT(ni, 351 IEEE80211_FC0_SUBTYPE_AUTH, 2); 352 break; 353 case IEEE80211_FC0_SUBTYPE_DEAUTH: 354 sta_authretry(vap, ni, arg>>8); 355 break; 356 } 357 break; 358 case IEEE80211_S_SLEEP: 359 case IEEE80211_S_RUN: 360 switch (arg & 0xff) { 361 case IEEE80211_FC0_SUBTYPE_AUTH: 362 IEEE80211_SEND_MGMT(ni, 363 IEEE80211_FC0_SUBTYPE_AUTH, 2); 364 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 365 break; 366 case IEEE80211_FC0_SUBTYPE_DEAUTH: 367 ieee80211_sta_leave(ni); 368 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 369 /* try to reauth */ 370 IEEE80211_SEND_MGMT(ni, 371 IEEE80211_FC0_SUBTYPE_AUTH, 1); 372 } 373 break; 374 } 375 break; 376 default: 377 goto invalid; 378 } 379 break; 380 case IEEE80211_S_ASSOC: 381 switch (ostate) { 382 case IEEE80211_S_AUTH: 383 case IEEE80211_S_ASSOC: 384 IEEE80211_SEND_MGMT(ni, 385 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 386 break; 387 case IEEE80211_S_SLEEP: /* cannot happen */ 388 case IEEE80211_S_RUN: 389 ieee80211_sta_leave(ni); 390 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 391 IEEE80211_SEND_MGMT(ni, arg ? 392 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 393 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 394 } 395 break; 396 default: 397 goto invalid; 398 } 399 break; 400 case IEEE80211_S_RUN: 401 if (vap->iv_flags & IEEE80211_F_WPA) { 402 /* XXX validate prerequisites */ 403 } 404 switch (ostate) { 405 case IEEE80211_S_RUN: 406 case IEEE80211_S_CSA: 407 break; 408 case IEEE80211_S_AUTH: /* when join is done in fw */ 409 case IEEE80211_S_ASSOC: 410 #ifdef IEEE80211_DEBUG 411 if (ieee80211_msg_debug(vap)) { 412 ieee80211_note(vap, "%s with %s ssid ", 413 (vap->iv_opmode == IEEE80211_M_STA ? 414 "associated" : "synchronized"), 415 ether_sprintf(ni->ni_bssid)); 416 ieee80211_print_essid(vap->iv_bss->ni_essid, 417 ni->ni_esslen); 418 printf(" channel %d start %uMbit/s\n", 419 ieee80211_chan2ieee(ic, ic->ic_curchan), 420 ieee80211_node_get_txrate_kbit(ni) / 1000); 421 } 422 #endif 423 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 424 ieee80211_notify_node_join(ni, 425 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 426 break; 427 case IEEE80211_S_SLEEP: 428 /* Wake up from sleep */ 429 vap->iv_sta_ps(vap, 0); 430 break; 431 default: 432 goto invalid; 433 } 434 ieee80211_sync_curchan(ic); 435 if (ostate != IEEE80211_S_RUN) 436 sta_swbmiss_start(vap); 437 /* 438 * When 802.1x is not in use mark the port authorized 439 * at this point so traffic can flow. 440 */ 441 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 442 ieee80211_node_authorize(ni); 443 /* 444 * Fake association when joining an existing bss. 445 * 446 * Don't do this if we're doing SLEEP->RUN. 447 */ 448 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 449 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 450 break; 451 case IEEE80211_S_CSA: 452 if (ostate != IEEE80211_S_RUN) 453 goto invalid; 454 break; 455 case IEEE80211_S_SLEEP: 456 sta_swbmiss_start(vap); 457 vap->iv_sta_ps(vap, 1); 458 break; 459 default: 460 invalid: 461 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 462 "%s: unexpected state transition %s -> %s\n", __func__, 463 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 464 break; 465 } 466 return 0; 467 } 468 469 /* 470 * Return non-zero if the frame is an echo of a multicast 471 * frame sent by ourself. The dir is known to be DSTODS. 472 */ 473 static __inline int 474 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 475 { 476 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 477 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 478 const uint8_t *sa; 479 480 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 481 482 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 483 return 0; 484 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 485 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 486 #undef WH4 487 #undef QWH4 488 } 489 490 /* 491 * Return non-zero if the frame is an echo of a multicast 492 * frame sent by ourself. The dir is known to be FROMDS. 493 */ 494 static __inline int 495 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 496 { 497 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 498 499 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 500 return 0; 501 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 502 } 503 504 /* 505 * Decide if a received management frame should be 506 * printed when debugging is enabled. This filters some 507 * of the less interesting frames that come frequently 508 * (e.g. beacons). 509 */ 510 static __inline int 511 doprint(struct ieee80211vap *vap, int subtype) 512 { 513 switch (subtype) { 514 case IEEE80211_FC0_SUBTYPE_BEACON: 515 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 516 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 517 return 0; 518 } 519 return 1; 520 } 521 522 /* 523 * Process a received frame. The node associated with the sender 524 * should be supplied. If nothing was found in the node table then 525 * the caller is assumed to supply a reference to iv_bss instead. 526 * The RSSI and a timestamp are also supplied. The RSSI data is used 527 * during AP scanning to select a AP to associate with; it can have 528 * any units so long as values have consistent units and higher values 529 * mean ``better signal''. The receive timestamp is currently not used 530 * by the 802.11 layer. 531 */ 532 static int 533 sta_input(struct ieee80211_node *ni, struct mbuf *m, 534 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 535 { 536 struct ieee80211vap *vap = ni->ni_vap; 537 struct ieee80211com *ic = ni->ni_ic; 538 struct ifnet *ifp = vap->iv_ifp; 539 struct ieee80211_frame *wh; 540 struct ieee80211_key *key; 541 struct ether_header *eh; 542 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 543 uint8_t dir, type, subtype, qos; 544 uint8_t *bssid; 545 int is_hw_decrypted = 0; 546 int has_decrypted = 0; 547 548 KASSERT(ni != NULL, ("%s: null node, mbuf %p", __func__, m)); 549 550 /* Early init in case of early error case. */ 551 type = -1; 552 553 /* 554 * Bit of a cheat here, we use a pointer for a 3-address 555 * frame format but don't reference fields past outside 556 * ieee80211_frame_min (or other shorter frames) w/o first 557 * validating the data is present. 558 */ 559 wh = mtod(m, struct ieee80211_frame *); 560 561 if (m->m_pkthdr.len < 2 || m->m_pkthdr.len < ieee80211_anyhdrsize(wh)) { 562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 563 ni->ni_macaddr, NULL, 564 "too short (1): len %u", m->m_pkthdr.len); 565 vap->iv_stats.is_rx_tooshort++; 566 goto err; 567 } 568 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) { 569 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 570 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 571 wh->i_fc[0], wh->i_fc[1]); 572 vap->iv_stats.is_rx_badversion++; 573 goto err; 574 } 575 576 /* 577 * Some devices do hardware decryption all the way through 578 * to pretending the frame wasn't encrypted in the first place. 579 * So, tag it appropriately so it isn't discarded inappropriately. 580 */ 581 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 582 is_hw_decrypted = 1; 583 584 if (m->m_flags & M_AMPDU_MPDU) { 585 /* 586 * Fastpath for A-MPDU reorder q resubmission. Frames 587 * w/ M_AMPDU_MPDU marked have already passed through 588 * here but were received out of order and been held on 589 * the reorder queue. When resubmitted they are marked 590 * with the M_AMPDU_MPDU flag and we can bypass most of 591 * the normal processing. 592 */ 593 type = IEEE80211_FC0_TYPE_DATA; 594 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 595 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA; 596 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 597 goto resubmit_ampdu; 598 } 599 600 ni->ni_inact = ni->ni_inact_reload; 601 602 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 603 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 604 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 605 /* 606 * Control frames are not folowing the header scheme of data and mgmt 607 * frames so we do not apply extra checks here. 608 * We probably should do checks on RA (+TA) where available for those 609 * too, but for now do not drop them. 610 */ 611 if (type != IEEE80211_FC0_TYPE_CTL && 612 (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, vap->iv_myaddr))) { 638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 639 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 640 vap->iv_myaddr, ":", 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 (ieee80211_vap_ifp_check_is_simplex(vap) && 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 (ieee80211_vap_ifp_check_is_simplex(vap) && 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 || IEEE80211_IS_PROTECTED(wh)) { 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_DATA) 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 (IEEE80211_IS_PROTECTED(wh)) { 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 if (ieee80211_is_ctl_frame_for_vap(ni, m)) 976 vap->iv_recv_ctl(ni, m, subtype); 977 goto out; 978 979 default: 980 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 981 wh, NULL, "bad frame type 0x%x", type); 982 /* should not come here */ 983 break; 984 } 985 err: 986 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 987 out: 988 if (m != NULL) { 989 if (need_tap && ieee80211_radiotap_active_vap(vap)) 990 ieee80211_radiotap_rx(vap, m); 991 m_freem(m); 992 } 993 return type; 994 } 995 996 static void 997 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 998 int rssi, int nf, uint16_t seq, uint16_t status) 999 { 1000 struct ieee80211vap *vap = ni->ni_vap; 1001 1002 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 1003 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1004 ni->ni_macaddr, "open auth", 1005 "bad sta auth mode %u", ni->ni_authmode); 1006 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 1007 return; 1008 } 1009 if (vap->iv_state != IEEE80211_S_AUTH || 1010 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1011 vap->iv_stats.is_rx_bad_auth++; 1012 return; 1013 } 1014 if (status != 0) { 1015 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1016 ni, "open auth failed (reason %d)", status); 1017 vap->iv_stats.is_rx_auth_fail++; 1018 vap->iv_stats.is_rx_authfail_code = status; 1019 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1020 IEEE80211_SCAN_FAIL_STATUS); 1021 } else 1022 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1023 } 1024 1025 static void 1026 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1027 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1028 uint16_t seq, uint16_t status) 1029 { 1030 struct ieee80211vap *vap = ni->ni_vap; 1031 uint8_t *challenge; 1032 1033 /* 1034 * NB: this can happen as we allow pre-shared key 1035 * authentication to be enabled w/o wep being turned 1036 * on so that configuration of these can be done 1037 * in any order. It may be better to enforce the 1038 * ordering in which case this check would just be 1039 * for sanity/consistency. 1040 */ 1041 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1042 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1043 ni->ni_macaddr, "shared key auth", 1044 "%s", " PRIVACY is disabled"); 1045 goto bad; 1046 } 1047 /* 1048 * Pre-shared key authentication is evil; accept 1049 * it only if explicitly configured (it is supported 1050 * mainly for compatibility with clients like OS X). 1051 */ 1052 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1053 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1054 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1055 ni->ni_macaddr, "shared key auth", 1056 "bad sta auth mode %u", ni->ni_authmode); 1057 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1058 goto bad; 1059 } 1060 1061 challenge = NULL; 1062 if (frm + 1 < efrm) { 1063 if ((frm[1] + 2) > (efrm - frm)) { 1064 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1065 ni->ni_macaddr, "shared key auth", 1066 "ie %d/%d too long", 1067 frm[0], (frm[1] + 2) - (efrm - frm)); 1068 vap->iv_stats.is_rx_bad_auth++; 1069 goto bad; 1070 } 1071 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1072 challenge = frm; 1073 frm += frm[1] + 2; 1074 } 1075 switch (seq) { 1076 case IEEE80211_AUTH_SHARED_CHALLENGE: 1077 case IEEE80211_AUTH_SHARED_RESPONSE: 1078 if (challenge == NULL) { 1079 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1080 ni->ni_macaddr, "shared key auth", 1081 "%s", "no challenge"); 1082 vap->iv_stats.is_rx_bad_auth++; 1083 goto bad; 1084 } 1085 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1086 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1087 ni->ni_macaddr, "shared key auth", 1088 "bad challenge len %d", challenge[1]); 1089 vap->iv_stats.is_rx_bad_auth++; 1090 goto bad; 1091 } 1092 default: 1093 break; 1094 } 1095 if (vap->iv_state != IEEE80211_S_AUTH) 1096 return; 1097 switch (seq) { 1098 case IEEE80211_AUTH_SHARED_PASS: 1099 if (ni->ni_challenge != NULL) { 1100 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1101 ni->ni_challenge = NULL; 1102 } 1103 if (status != 0) { 1104 IEEE80211_NOTE_FRAME(vap, 1105 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1106 "shared key auth failed (reason %d)", status); 1107 vap->iv_stats.is_rx_auth_fail++; 1108 vap->iv_stats.is_rx_authfail_code = status; 1109 return; 1110 } 1111 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1112 break; 1113 case IEEE80211_AUTH_SHARED_CHALLENGE: 1114 if (!ieee80211_alloc_challenge(ni)) 1115 return; 1116 /* XXX could optimize by passing recvd challenge */ 1117 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1118 IEEE80211_SEND_MGMT(ni, 1119 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1120 break; 1121 default: 1122 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1123 wh, "shared key auth", "bad seq %d", seq); 1124 vap->iv_stats.is_rx_bad_auth++; 1125 return; 1126 } 1127 return; 1128 bad: 1129 /* 1130 * Kick the state machine. This short-circuits 1131 * using the mgt frame timeout to trigger the 1132 * state transition. 1133 */ 1134 if (vap->iv_state == IEEE80211_S_AUTH) 1135 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1136 IEEE80211_SCAN_FAIL_STATUS); 1137 } 1138 1139 /* 1140 * Parse the WME IE for QoS and U-APSD information. 1141 * 1142 * Returns -1 if the IE isn't found, 1 if it's found. 1143 */ 1144 int 1145 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh, 1146 struct ieee80211_node *ni) 1147 { 1148 u_int len = frm[1]; 1149 1150 ni->ni_uapsd = 0; 1151 1152 if (len < sizeof(struct ieee80211_wme_param)-2) { 1153 IEEE80211_DISCARD_IE(ni->ni_vap, 1154 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1155 wh, "WME", "too short, len %u", len); 1156 return -1; 1157 } 1158 1159 ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET]; 1160 1161 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC, 1162 ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd); 1163 1164 return 1; 1165 } 1166 1167 int 1168 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1169 const struct ieee80211_frame *wh, uint8_t *qosinfo) 1170 { 1171 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1172 u_int len = frm[1], qosinfo_count; 1173 int i; 1174 1175 *qosinfo = 0; 1176 1177 if (len < sizeof(struct ieee80211_wme_param)-2) { 1178 IEEE80211_DISCARD_IE(vap, 1179 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1180 wh, "WME", "too short, len %u", len); 1181 return -1; 1182 } 1183 *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1184 qosinfo_count = *qosinfo & WME_QOSINFO_COUNT; 1185 1186 /* XXX do proper check for wraparound */ 1187 if (qosinfo_count == wme->wme_wmeChanParams.cap_info) 1188 return 0; 1189 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1190 for (i = 0; i < WME_NUM_AC; i++) { 1191 struct wmeParams *wmep = 1192 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1193 /* NB: ACI not used */ 1194 wmep->wmep_acm = _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_ACM); 1195 wmep->wmep_aifsn = 1196 _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_AIFSN); 1197 wmep->wmep_logcwmin = 1198 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMIN); 1199 wmep->wmep_logcwmax = 1200 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMAX); 1201 wmep->wmep_txopLimit = le16dec(frm+2); 1202 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 1203 "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n", 1204 __func__, 1205 i, 1206 wmep->wmep_acm, 1207 wmep->wmep_aifsn, 1208 wmep->wmep_logcwmin, 1209 wmep->wmep_logcwmax, 1210 wmep->wmep_txopLimit); 1211 frm += 4; 1212 } 1213 wme->wme_wmeChanParams.cap_info = qosinfo_count; 1214 return 1; 1215 } 1216 1217 /* 1218 * Process 11h Channel Switch Announcement (CSA) ie. If this 1219 * is the first CSA then initiate the switch. Otherwise we 1220 * track state and trigger completion and/or cancel of the switch. 1221 * XXX should be public for IBSS use 1222 */ 1223 static void 1224 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1225 const struct ieee80211_frame *wh) 1226 { 1227 struct ieee80211com *ic = vap->iv_ic; 1228 const struct ieee80211_csa_ie *csa = 1229 (const struct ieee80211_csa_ie *) frm; 1230 1231 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1232 ("state %s", ieee80211_state_name[vap->iv_state])); 1233 1234 if (csa->csa_mode > 1) { 1235 IEEE80211_DISCARD_IE(vap, 1236 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1237 wh, "CSA", "invalid mode %u", csa->csa_mode); 1238 return; 1239 } 1240 IEEE80211_LOCK(ic); 1241 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1242 /* 1243 * Convert the channel number to a channel reference. We 1244 * try first to preserve turbo attribute of the current 1245 * channel then fallback. Note this will not work if the 1246 * CSA specifies a channel that requires a band switch (e.g. 1247 * 11a => 11g). This is intentional as 11h is defined only 1248 * for 5GHz/11a and because the switch does not involve a 1249 * reassociation, protocol state (capabilities, negotated 1250 * rates, etc) may/will be wrong. 1251 */ 1252 struct ieee80211_channel *c = 1253 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1254 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1255 if (c == NULL) { 1256 c = ieee80211_find_channel_byieee(ic, 1257 csa->csa_newchan, 1258 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1259 if (c == NULL) { 1260 IEEE80211_DISCARD_IE(vap, 1261 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1262 wh, "CSA", "invalid channel %u", 1263 csa->csa_newchan); 1264 goto done; 1265 } 1266 } 1267 #if IEEE80211_CSA_COUNT_MIN > 0 1268 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1269 /* 1270 * Require at least IEEE80211_CSA_COUNT_MIN count to 1271 * reduce the risk of being redirected by a fabricated 1272 * CSA. If a valid CSA is dropped we'll still get a 1273 * beacon miss when the AP leaves the channel so we'll 1274 * eventually follow to the new channel. 1275 * 1276 * NOTE: this violates the 11h spec that states that 1277 * count may be any value and if 0 then a switch 1278 * should happen asap. 1279 */ 1280 IEEE80211_DISCARD_IE(vap, 1281 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1282 wh, "CSA", "count %u too small, must be >= %u", 1283 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1284 goto done; 1285 } 1286 #endif 1287 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1288 } else { 1289 /* 1290 * Validate this ie against the initial CSA. We require 1291 * mode and channel not change and the count must be 1292 * monotonically decreasing. This may be pointless and 1293 * canceling the switch as a result may be too paranoid but 1294 * in the worst case if we drop out of CSA because of this 1295 * and the AP does move then we'll just end up taking a 1296 * beacon miss and scan to find the AP. 1297 * 1298 * XXX may want <= on count as we also process ProbeResp 1299 * frames and those may come in w/ the same count as the 1300 * previous beacon; but doing so leaves us open to a stuck 1301 * count until we add a dead-man timer 1302 */ 1303 if (!(csa->csa_count < ic->ic_csa_count && 1304 csa->csa_mode == ic->ic_csa_mode && 1305 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1306 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1307 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1308 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1309 ic->ic_csa_newchan, ic->ic_csa_count, 1310 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1311 ieee80211_csa_cancelswitch(ic); 1312 } else { 1313 if (csa->csa_count <= 1) 1314 ieee80211_csa_completeswitch(ic); 1315 else 1316 ic->ic_csa_count = csa->csa_count; 1317 } 1318 } 1319 done: 1320 IEEE80211_UNLOCK(ic); 1321 } 1322 1323 /* 1324 * Return non-zero if a background scan may be continued: 1325 * o bg scan is active 1326 * o no channel switch is pending 1327 * o there has not been any traffic recently 1328 * o no full-offload scan support (no need for explicitly continuing scan then) 1329 * 1330 * Note we do not check if there is an administrative enable; 1331 * this is only done to start the scan. We assume that any 1332 * change in state will be accompanied by a request to cancel 1333 * active scans which will otherwise cause this test to fail. 1334 */ 1335 static __inline int 1336 contbgscan(struct ieee80211vap *vap) 1337 { 1338 struct ieee80211com *ic = vap->iv_ic; 1339 1340 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1341 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1342 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) && 1343 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1344 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1345 } 1346 1347 /* 1348 * Return non-zero if a backgrond scan may be started: 1349 * o bg scanning is administratively enabled 1350 * o no channel switch is pending 1351 * o we are not boosted on a dynamic turbo channel 1352 * o there has not been a scan recently 1353 * o there has not been any traffic recently (don't check if full-offload scan) 1354 */ 1355 static __inline int 1356 startbgscan(struct ieee80211vap *vap) 1357 { 1358 struct ieee80211com *ic = vap->iv_ic; 1359 1360 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1361 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1362 #ifdef IEEE80211_SUPPORT_SUPERG 1363 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1364 #endif 1365 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1366 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) || 1367 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))); 1368 } 1369 1370 #ifdef notyet 1371 /* 1372 * Compare two quiet IEs and return if they are equivalent. 1373 * 1374 * The tbttcount isn't checked - that's not part of the configuration. 1375 */ 1376 static int 1377 compare_quiet_ie(const struct ieee80211_quiet_ie *q1, 1378 const struct ieee80211_quiet_ie *q2) 1379 { 1380 1381 if (q1->period != q2->period) 1382 return (0); 1383 if (le16dec(&q1->duration) != le16dec(&q2->duration)) 1384 return (0); 1385 if (le16dec(&q1->offset) != le16dec(&q2->offset)) 1386 return (0); 1387 return (1); 1388 } 1389 #endif 1390 1391 static void 1392 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1393 const struct ieee80211_rx_stats *rxs, 1394 int rssi, int nf) 1395 { 1396 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1397 struct ieee80211vap *vap = ni->ni_vap; 1398 struct ieee80211com *ic = ni->ni_ic; 1399 struct ieee80211_channel *rxchan = ic->ic_curchan; 1400 struct ieee80211_frame *wh; 1401 int ht_state_change = 0, do_ht = 0; 1402 uint8_t *frm, *efrm; 1403 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1404 uint8_t *vhtcap, *vhtopmode; 1405 uint8_t rate; 1406 uint8_t qosinfo; 1407 1408 wh = mtod(m0, struct ieee80211_frame *); 1409 frm = (uint8_t *)&wh[1]; 1410 efrm = mtod(m0, uint8_t *) + m0->m_len; 1411 switch (subtype) { 1412 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1413 case IEEE80211_FC0_SUBTYPE_BEACON: { 1414 struct ieee80211_scanparams scan; 1415 struct ieee80211_channel *c; 1416 /* 1417 * We process beacon/probe response frames: 1418 * o when scanning, or 1419 * o station mode when associated (to collect state 1420 * updates such as 802.11g slot time) 1421 * Frames otherwise received are discarded. 1422 */ 1423 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1424 vap->iv_stats.is_rx_mgtdiscard++; 1425 return; 1426 } 1427 1428 /* Override RX channel as appropriate */ 1429 if (rxs != NULL) { 1430 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1431 if (c != NULL) 1432 rxchan = c; 1433 } 1434 1435 /* XXX probe response in sta mode when !scanning? */ 1436 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1437 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1438 vap->iv_stats.is_beacon_bad++; 1439 return; 1440 } 1441 1442 /* 1443 * Count frame now that we know it's to be processed. 1444 */ 1445 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1446 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1447 IEEE80211_NODE_STAT(ni, rx_beacons); 1448 } else 1449 IEEE80211_NODE_STAT(ni, rx_proberesp); 1450 /* 1451 * When operating in station mode, check for state updates. 1452 * Be careful to ignore beacons received while doing a 1453 * background scan. We consider only 11g/WMM stuff right now. 1454 */ 1455 if (ni->ni_associd != 0 && 1456 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1457 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1458 /* record tsf of last beacon */ 1459 memcpy(ni->ni_tstamp.data, scan.tstamp, 1460 sizeof(ni->ni_tstamp)); 1461 /* count beacon frame for s/w bmiss handling */ 1462 vap->iv_swbmiss_count++; 1463 vap->iv_bmiss_count = 0; 1464 if (ni->ni_erp != scan.erp) { 1465 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1466 wh->i_addr2, 1467 "erp change: was 0x%x, now 0x%x", 1468 ni->ni_erp, scan.erp); 1469 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1470 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1471 vap->iv_flags |= IEEE80211_F_USEPROT; 1472 else 1473 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1474 ni->ni_erp = scan.erp; 1475 /* XXX statistic */ 1476 /* driver notification */ 1477 ieee80211_vap_update_erp_protmode(vap); 1478 } 1479 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1480 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1481 wh->i_addr2, 1482 "capabilities change: was 0x%x, now 0x%x", 1483 ni->ni_capinfo, scan.capinfo); 1484 /* 1485 * NB: we assume short preamble doesn't 1486 * change dynamically 1487 */ 1488 ieee80211_vap_set_shortslottime(vap, 1489 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1490 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1491 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1492 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1493 /* XXX statistic */ 1494 } 1495 if (scan.wme != NULL && 1496 (ni->ni_flags & IEEE80211_NODE_QOS)) { 1497 int _retval; 1498 if ((_retval = ieee80211_parse_wmeparams(vap, 1499 scan.wme, wh, &qosinfo)) >= 0) { 1500 if (qosinfo & WME_CAPINFO_UAPSD_EN) 1501 ni->ni_flags |= 1502 IEEE80211_NODE_UAPSD; 1503 if (_retval > 0) 1504 ieee80211_wme_updateparams(vap); 1505 } 1506 } else 1507 ni->ni_flags &= ~IEEE80211_NODE_UAPSD; 1508 #ifdef IEEE80211_SUPPORT_SUPERG 1509 if (scan.ath != NULL) 1510 ieee80211_parse_athparams(ni, scan.ath, wh); 1511 #endif 1512 if (scan.htcap != NULL && scan.htinfo != NULL && 1513 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1514 /* XXX state changes? */ 1515 ieee80211_ht_updateparams(ni, 1516 scan.htcap, scan.htinfo); 1517 do_ht = 1; 1518 } 1519 if (scan.vhtcap != NULL && scan.vhtopmode != NULL && 1520 (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) { 1521 /* XXX state changes? */ 1522 ieee80211_vht_updateparams(ni, 1523 scan.vhtcap, scan.vhtopmode); 1524 do_ht = 1; 1525 } 1526 if (do_ht) { 1527 if (ieee80211_ht_updateparams_final(ni, 1528 scan.htcap, scan.htinfo)) 1529 ht_state_change = 1; 1530 } 1531 1532 /* 1533 * If we have a quiet time IE then report it up to 1534 * the driver. 1535 * 1536 * Otherwise, inform the driver that the quiet time 1537 * IE has disappeared - only do that once rather than 1538 * spamming it each time. 1539 */ 1540 if (scan.quiet) { 1541 ic->ic_set_quiet(ni, scan.quiet); 1542 ni->ni_quiet_ie_set = 1; 1543 memcpy(&ni->ni_quiet_ie, scan.quiet, 1544 sizeof(struct ieee80211_quiet_ie)); 1545 } else { 1546 if (ni->ni_quiet_ie_set == 1) 1547 ic->ic_set_quiet(ni, NULL); 1548 ni->ni_quiet_ie_set = 0; 1549 bzero(&ni->ni_quiet_ie, 1550 sizeof(struct ieee80211_quiet_ie)); 1551 } 1552 1553 if (scan.tim != NULL) { 1554 struct ieee80211_tim_ie *tim = 1555 (struct ieee80211_tim_ie *) scan.tim; 1556 /* 1557 * XXX Check/debug this code; see if it's about 1558 * the right time to force the VAP awake if we 1559 * receive a frame destined for us? 1560 */ 1561 int aid = IEEE80211_AID(ni->ni_associd); 1562 int ix = aid / NBBY; 1563 int min = tim->tim_bitctl &~ 1; 1564 int max = tim->tim_len + min - 4; 1565 int tim_ucast = 0; 1566 #ifdef __notyet__ 1567 int tim_mcast = 0; 1568 #endif 1569 1570 /* 1571 * Only do this for unicast traffic in the TIM 1572 * The multicast traffic notification for 1573 * the scan notification stuff should occur 1574 * differently. 1575 */ 1576 if (min <= ix && ix <= max && 1577 isset(tim->tim_bitmap - min, aid)) { 1578 tim_ucast = 1; 1579 } 1580 1581 #ifdef __notyet__ 1582 /* 1583 * Do a separate notification 1584 * for the multicast bit being set. 1585 */ 1586 if (tim->tim_bitctl & 1) { 1587 tim_mcast = 1; 1588 } 1589 #endif 1590 1591 /* 1592 * If the TIM indicates there's traffic for 1593 * us then get us out of STA mode powersave. 1594 */ 1595 if (tim_ucast == 1) { 1596 /* 1597 * Wake us out of SLEEP state if we're 1598 * in it; and if we're doing bgscan 1599 * then wake us out of STA powersave. 1600 */ 1601 ieee80211_sta_tim_notify(vap, 1); 1602 1603 /* 1604 * This is preventing us from 1605 * continuing a bgscan; because it 1606 * tricks the contbgscan() 1607 * routine to think there's always 1608 * traffic for us. 1609 * 1610 * I think we need both an RX and 1611 * TX ic_lastdata field. 1612 */ 1613 ic->ic_lastdata = ticks; 1614 } 1615 1616 ni->ni_dtim_count = tim->tim_count; 1617 ni->ni_dtim_period = tim->tim_period; 1618 } 1619 if (scan.csa != NULL && 1620 (vap->iv_flags & IEEE80211_F_DOTH)) 1621 ieee80211_parse_csaparams(vap, scan.csa, wh); 1622 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1623 /* 1624 * No CSA ie or 11h disabled, but a channel 1625 * switch is pending; drop out so we aren't 1626 * stuck in CSA state. If the AP really is 1627 * moving we'll get a beacon miss and scan. 1628 */ 1629 IEEE80211_LOCK(ic); 1630 ieee80211_csa_cancelswitch(ic); 1631 IEEE80211_UNLOCK(ic); 1632 } 1633 /* 1634 * If scanning, pass the info to the scan module. 1635 * Otherwise, check if it's the right time to do 1636 * a background scan. Background scanning must 1637 * be enabled and we must not be operating in the 1638 * turbo phase of dynamic turbo mode. Then, 1639 * it's been a while since the last background 1640 * scan and if no data frames have come through 1641 * recently, kick off a scan. Note that this 1642 * is the mechanism by which a background scan 1643 * is started _and_ continued each time we 1644 * return on-channel to receive a beacon from 1645 * our ap. 1646 */ 1647 if (ic->ic_flags & IEEE80211_F_SCAN) { 1648 ieee80211_add_scan(vap, rxchan, 1649 &scan, wh, subtype, rssi, nf); 1650 } else if (contbgscan(vap)) { 1651 ieee80211_bg_scan(vap, 0); 1652 } else if (startbgscan(vap)) { 1653 vap->iv_stats.is_scan_bg++; 1654 #if 0 1655 /* wakeup if we are sleeing */ 1656 ieee80211_set_pwrsave(vap, 0); 1657 #endif 1658 ieee80211_bg_scan(vap, 0); 1659 } 1660 1661 /* 1662 * Put the station to sleep if we haven't seen 1663 * traffic in a while. 1664 */ 1665 IEEE80211_LOCK(ic); 1666 ieee80211_sta_ps_timer_check(vap); 1667 IEEE80211_UNLOCK(ic); 1668 1669 /* 1670 * If we've had a channel width change (eg HT20<->HT40) 1671 * then schedule a delayed driver notification. 1672 */ 1673 if (ht_state_change) 1674 ieee80211_update_chw(ic); 1675 return; 1676 } 1677 /* 1678 * If scanning, just pass information to the scan module. 1679 */ 1680 if (ic->ic_flags & IEEE80211_F_SCAN) { 1681 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1682 /* 1683 * Actively scanning a channel marked passive; 1684 * send a probe request now that we know there 1685 * is 802.11 traffic present. 1686 * 1687 * XXX check if the beacon we recv'd gives 1688 * us what we need and suppress the probe req 1689 */ 1690 ieee80211_probe_curchan(vap, true); 1691 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1692 } 1693 ieee80211_add_scan(vap, rxchan, &scan, wh, 1694 subtype, rssi, nf); 1695 return; 1696 } 1697 break; 1698 } 1699 1700 case IEEE80211_FC0_SUBTYPE_AUTH: { 1701 uint16_t algo, seq, status; 1702 /* 1703 * auth frame format 1704 * [2] algorithm 1705 * [2] sequence 1706 * [2] status 1707 * [tlv*] challenge 1708 */ 1709 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1710 algo = le16toh(*(uint16_t *)frm); 1711 seq = le16toh(*(uint16_t *)(frm + 2)); 1712 status = le16toh(*(uint16_t *)(frm + 4)); 1713 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1714 "recv auth frame with algorithm %d seq %d", algo, seq); 1715 1716 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1717 IEEE80211_DISCARD(vap, 1718 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1719 wh, "auth", "%s", "TKIP countermeasures enabled"); 1720 vap->iv_stats.is_rx_auth_countermeasures++; 1721 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1722 ieee80211_send_error(ni, wh->i_addr2, 1723 IEEE80211_FC0_SUBTYPE_AUTH, 1724 IEEE80211_REASON_MIC_FAILURE); 1725 } 1726 return; 1727 } 1728 if (algo == IEEE80211_AUTH_ALG_SHARED) 1729 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1730 seq, status); 1731 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1732 sta_auth_open(ni, wh, rssi, nf, seq, status); 1733 else { 1734 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1735 wh, "auth", "unsupported alg %d", algo); 1736 vap->iv_stats.is_rx_auth_unsupported++; 1737 return; 1738 } 1739 break; 1740 } 1741 1742 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1743 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1744 uint16_t capinfo, associd; 1745 uint16_t status; 1746 1747 if (vap->iv_state != IEEE80211_S_ASSOC) { 1748 vap->iv_stats.is_rx_mgtdiscard++; 1749 return; 1750 } 1751 1752 /* 1753 * asresp frame format 1754 * [2] capability information 1755 * [2] status 1756 * [2] association ID 1757 * [tlv] supported rates 1758 * [tlv] extended supported rates 1759 * [tlv] WME 1760 * [tlv] HT capabilities 1761 * [tlv] HT info 1762 */ 1763 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1764 ni = vap->iv_bss; 1765 capinfo = le16toh(*(uint16_t *)frm); 1766 frm += 2; 1767 status = le16toh(*(uint16_t *)frm); 1768 frm += 2; 1769 if (status != 0) { 1770 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1771 wh->i_addr2, "%sassoc failed (reason %d)", 1772 ISREASSOC(subtype) ? "re" : "", status); 1773 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1774 return; 1775 } 1776 associd = le16toh(*(uint16_t *)frm); 1777 frm += 2; 1778 1779 rates = xrates = wme = htcap = htinfo = NULL; 1780 vhtcap = vhtopmode = NULL; 1781 while (efrm - frm > 1) { 1782 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1783 switch (*frm) { 1784 case IEEE80211_ELEMID_RATES: 1785 rates = frm; 1786 break; 1787 case IEEE80211_ELEMID_XRATES: 1788 xrates = frm; 1789 break; 1790 case IEEE80211_ELEMID_HTCAP: 1791 htcap = frm; 1792 break; 1793 case IEEE80211_ELEMID_HTINFO: 1794 htinfo = frm; 1795 break; 1796 case IEEE80211_ELEMID_VENDOR: 1797 if (iswmeoui(frm)) 1798 wme = frm; 1799 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1800 /* 1801 * Accept pre-draft HT ie's if the 1802 * standard ones have not been seen. 1803 */ 1804 if (ishtcapoui(frm)) { 1805 if (htcap == NULL) 1806 htcap = frm; 1807 } else if (ishtinfooui(frm)) { 1808 if (htinfo == NULL) 1809 htinfo = frm; 1810 } 1811 } 1812 /* XXX Atheros OUI support */ 1813 break; 1814 case IEEE80211_ELEMID_VHT_CAP: 1815 vhtcap = frm; 1816 break; 1817 case IEEE80211_ELEMID_VHT_OPMODE: 1818 vhtopmode = frm; 1819 break; 1820 } 1821 frm += frm[1] + 2; 1822 } 1823 1824 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1825 if (xrates != NULL) 1826 IEEE80211_VERIFY_ELEMENT(xrates, 1827 IEEE80211_RATE_MAXSIZE - rates[1], return); 1828 rate = ieee80211_setup_rates(ni, rates, xrates, 1829 IEEE80211_F_JOIN | 1830 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1831 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1832 if (rate & IEEE80211_RATE_BASIC) { 1833 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1834 wh->i_addr2, 1835 "%sassoc failed (rate set mismatch)", 1836 ISREASSOC(subtype) ? "re" : ""); 1837 vap->iv_stats.is_rx_assoc_norate++; 1838 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1839 IEEE80211_SCAN_FAIL_STATUS); 1840 return; 1841 } 1842 1843 ni->ni_capinfo = capinfo; 1844 ni->ni_associd = associd; 1845 if (ni->ni_jointime == 0) 1846 ni->ni_jointime = time_uptime; 1847 if (wme != NULL && 1848 ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) { 1849 ni->ni_flags |= IEEE80211_NODE_QOS; 1850 ieee80211_wme_updateparams(vap); 1851 } else 1852 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1853 /* 1854 * Setup HT state according to the negotiation. 1855 * 1856 * NB: shouldn't need to check if HT use is enabled but some 1857 * ap's send back HT ie's even when we don't indicate we 1858 * are HT capable in our AssocReq. 1859 */ 1860 if (htcap != NULL && htinfo != NULL && 1861 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1862 ieee80211_ht_node_init(ni); 1863 ieee80211_ht_updateparams(ni, htcap, htinfo); 1864 1865 if ((vhtcap != NULL) && (vhtopmode != NULL) & 1866 (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) { 1867 /* 1868 * Log if we get a VHT assoc/reassoc response. 1869 * We aren't ready for 2GHz VHT support. 1870 */ 1871 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) { 1872 printf("%s: peer %6D: VHT on 2GHz, ignoring\n", 1873 __func__, 1874 ni->ni_macaddr, 1875 ":"); 1876 } else { 1877 ieee80211_vht_node_init(ni); 1878 ieee80211_vht_updateparams(ni, vhtcap, vhtopmode); 1879 ieee80211_setup_vht_rates(ni); 1880 } 1881 } 1882 1883 ieee80211_ht_updateparams_final(ni, htcap, htinfo); 1884 ieee80211_setup_htrates(ni, htcap, 1885 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1886 ieee80211_setup_basic_htrates(ni, htinfo); 1887 1888 ieee80211_node_setuptxparms(ni); 1889 ieee80211_ratectl_node_init(ni); 1890 } 1891 1892 /* 1893 * Always initialise FF/superg state; we can use this 1894 * for doing A-MSDU encapsulation as well. 1895 */ 1896 #ifdef IEEE80211_SUPPORT_SUPERG 1897 ieee80211_ff_node_init(ni); 1898 #endif 1899 1900 /* 1901 * Configure state now that we are associated. 1902 * 1903 * XXX may need different/additional driver callbacks? 1904 */ 1905 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1906 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1907 vap->iv_flags |= IEEE80211_F_SHPREAMBLE; 1908 vap->iv_flags &= ~IEEE80211_F_USEBARKER; 1909 } else { 1910 vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE; 1911 vap->iv_flags |= IEEE80211_F_USEBARKER; 1912 } 1913 ieee80211_vap_set_shortslottime(vap, 1914 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1915 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1916 ieee80211_vap_update_preamble(vap); 1917 /* 1918 * Honor ERP protection. 1919 * 1920 * NB: ni_erp should zero for non-11g operation. 1921 */ 1922 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1923 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1924 vap->iv_flags |= IEEE80211_F_USEPROT; 1925 else 1926 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1927 ieee80211_vap_update_erp_protmode(vap); 1928 IEEE80211_NOTE_MAC(vap, 1929 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1930 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s", 1931 ISREASSOC(subtype) ? "re" : "", 1932 IEEE80211_NODE_AID(ni), 1933 vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1934 vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1935 vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1936 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1937 ni->ni_flags & IEEE80211_NODE_HT ? 1938 (ni->ni_chw == IEEE80211_STA_RX_BW_40 ? ", HT40" : ", HT20") : "", 1939 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1940 ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "", 1941 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1942 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1943 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1944 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1945 ", fast-frames" : "", 1946 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1947 ", turbo" : "" 1948 ); 1949 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1950 break; 1951 } 1952 1953 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1954 uint16_t reason; 1955 1956 if (vap->iv_state == IEEE80211_S_SCAN) { 1957 vap->iv_stats.is_rx_mgtdiscard++; 1958 return; 1959 } 1960 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1961 /* NB: can happen when in promiscuous mode */ 1962 vap->iv_stats.is_rx_mgtdiscard++; 1963 break; 1964 } 1965 1966 /* 1967 * deauth frame format 1968 * [2] reason 1969 */ 1970 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1971 reason = le16toh(*(uint16_t *)frm); 1972 1973 vap->iv_stats.is_rx_deauth++; 1974 vap->iv_stats.is_rx_deauth_code = reason; 1975 IEEE80211_NODE_STAT(ni, rx_deauth); 1976 1977 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1978 "recv deauthenticate (reason: %d (%s))", reason, 1979 ieee80211_reason_to_string(reason)); 1980 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1981 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1982 break; 1983 } 1984 1985 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1986 uint16_t reason; 1987 1988 if (vap->iv_state != IEEE80211_S_RUN && 1989 vap->iv_state != IEEE80211_S_ASSOC && 1990 vap->iv_state != IEEE80211_S_AUTH) { 1991 vap->iv_stats.is_rx_mgtdiscard++; 1992 return; 1993 } 1994 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1995 /* NB: can happen when in promiscuous mode */ 1996 vap->iv_stats.is_rx_mgtdiscard++; 1997 break; 1998 } 1999 2000 /* 2001 * disassoc frame format 2002 * [2] reason 2003 */ 2004 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2005 reason = le16toh(*(uint16_t *)frm); 2006 2007 vap->iv_stats.is_rx_disassoc++; 2008 vap->iv_stats.is_rx_disassoc_code = reason; 2009 IEEE80211_NODE_STAT(ni, rx_disassoc); 2010 2011 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2012 "recv disassociate (reason: %d (%s))", reason, 2013 ieee80211_reason_to_string(reason)); 2014 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 2015 break; 2016 } 2017 2018 case IEEE80211_FC0_SUBTYPE_ACTION: 2019 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2020 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2021 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2022 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2023 wh, NULL, "%s", "not for us"); 2024 vap->iv_stats.is_rx_mgtdiscard++; 2025 } else if (vap->iv_state != IEEE80211_S_RUN) { 2026 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2027 wh, NULL, "wrong state %s", 2028 ieee80211_state_name[vap->iv_state]); 2029 vap->iv_stats.is_rx_mgtdiscard++; 2030 } else { 2031 if (ieee80211_parse_action(ni, m0) == 0) 2032 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2033 } 2034 break; 2035 2036 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2037 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2038 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2039 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 2040 case IEEE80211_FC0_SUBTYPE_ATIM: 2041 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2042 wh, NULL, "%s", "not handled"); 2043 vap->iv_stats.is_rx_mgtdiscard++; 2044 break; 2045 2046 default: 2047 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2048 wh, "mgt", "subtype 0x%x not handled", subtype); 2049 vap->iv_stats.is_rx_badsubtype++; 2050 break; 2051 } 2052 #undef ISREASSOC 2053 } 2054 2055 static void 2056 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2057 { 2058 2059 switch (subtype) { 2060 case IEEE80211_FC0_SUBTYPE_BAR: 2061 ieee80211_recv_bar(ni, m); 2062 break; 2063 } 2064 } 2065