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 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 68 69 static void sta_vattach(struct ieee80211vap *); 70 static void sta_beacon_miss(struct ieee80211vap *); 71 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 72 static int sta_input(struct ieee80211_node *, struct mbuf *, 73 const struct ieee80211_rx_stats *, int, int); 74 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 75 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 76 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 77 78 void 79 ieee80211_sta_attach(struct ieee80211com *ic) 80 { 81 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 82 } 83 84 void 85 ieee80211_sta_detach(struct ieee80211com *ic) 86 { 87 } 88 89 static void 90 sta_vdetach(struct ieee80211vap *vap) 91 { 92 } 93 94 static void 95 sta_vattach(struct ieee80211vap *vap) 96 { 97 vap->iv_newstate = sta_newstate; 98 vap->iv_input = sta_input; 99 vap->iv_recv_mgmt = sta_recv_mgmt; 100 vap->iv_recv_ctl = sta_recv_ctl; 101 vap->iv_opdetach = sta_vdetach; 102 vap->iv_bmiss = sta_beacon_miss; 103 } 104 105 /* 106 * Handle a beacon miss event. The common code filters out 107 * spurious events that can happen when scanning and/or before 108 * reaching RUN state. 109 */ 110 static void 111 sta_beacon_miss(struct ieee80211vap *vap) 112 { 113 struct ieee80211com *ic = vap->iv_ic; 114 115 IEEE80211_LOCK_ASSERT(ic); 116 117 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 118 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 119 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 120 121 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 122 "beacon miss, mode %s state %s\n", 123 ieee80211_opmode_name[vap->iv_opmode], 124 ieee80211_state_name[vap->iv_state]); 125 126 if (vap->iv_state == IEEE80211_S_CSA) { 127 /* 128 * A Channel Switch is pending; assume we missed the 129 * beacon that would've completed the process and just 130 * force the switch. If we made a mistake we'll not 131 * find the AP on the new channel and fall back to a 132 * normal scan. 133 */ 134 ieee80211_csa_completeswitch(ic); 135 return; 136 } 137 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 138 /* 139 * Send a directed probe req before falling back to a 140 * scan; if we receive a response ic_bmiss_count will 141 * be reset. Some cards mistakenly report beacon miss 142 * so this avoids the expensive scan if the ap is 143 * still there. 144 */ 145 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 146 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 147 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 148 return; 149 } 150 151 callout_stop(&vap->iv_swbmiss); 152 vap->iv_bmiss_count = 0; 153 vap->iv_stats.is_beacon_miss++; 154 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 155 #ifdef IEEE80211_SUPPORT_SUPERG 156 157 /* 158 * If we receive a beacon miss interrupt when using 159 * dynamic turbo, attempt to switch modes before 160 * reassociating. 161 */ 162 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 163 ieee80211_dturbo_switch(vap, 164 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 165 #endif 166 /* 167 * Try to reassociate before scanning for a new ap. 168 */ 169 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 170 } else { 171 /* 172 * Somebody else is controlling state changes (e.g. 173 * a user-mode app) don't do anything that would 174 * confuse them; just drop into scan mode so they'll 175 * notified of the state change and given control. 176 */ 177 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 178 } 179 } 180 181 /* 182 * Handle deauth with reason. We retry only for 183 * the cases where we might succeed. Otherwise 184 * we downgrade the ap and scan. 185 */ 186 static void 187 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 188 { 189 switch (reason) { 190 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 191 case IEEE80211_STATUS_TIMEOUT: 192 case IEEE80211_REASON_ASSOC_EXPIRE: 193 case IEEE80211_REASON_NOT_AUTHED: 194 case IEEE80211_REASON_NOT_ASSOCED: 195 case IEEE80211_REASON_ASSOC_LEAVE: 196 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 197 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 198 break; 199 default: 200 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 201 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 202 ieee80211_check_scan_current(vap); 203 break; 204 } 205 } 206 207 static void 208 sta_swbmiss_start(struct ieee80211vap *vap) 209 { 210 211 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) { 212 /* 213 * Start s/w beacon miss timer for devices w/o 214 * hardware support. We fudge a bit here since 215 * we're doing this in software. 216 */ 217 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 218 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval); 219 vap->iv_swbmiss_count = 0; 220 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 221 ieee80211_swbmiss, vap); 222 } 223 } 224 225 /* 226 * IEEE80211_M_STA vap state machine handler. 227 * This routine handles the main states in the 802.11 protocol. 228 */ 229 static int 230 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 231 { 232 struct ieee80211com *ic = vap->iv_ic; 233 struct ieee80211_node *ni; 234 enum ieee80211_state ostate; 235 236 IEEE80211_LOCK_ASSERT(ic); 237 238 ostate = vap->iv_state; 239 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 240 __func__, ieee80211_state_name[ostate], 241 ieee80211_state_name[nstate], arg); 242 vap->iv_state = nstate; /* state transition */ 243 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 244 if (ostate != IEEE80211_S_SCAN) 245 ieee80211_cancel_scan(vap); /* background scan */ 246 ni = vap->iv_bss; /* NB: no reference held */ 247 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 248 callout_stop(&vap->iv_swbmiss); 249 switch (nstate) { 250 case IEEE80211_S_INIT: 251 switch (ostate) { 252 case IEEE80211_S_SLEEP: 253 /* XXX wakeup */ 254 /* XXX driver hook to wakeup the hardware? */ 255 case IEEE80211_S_RUN: 256 IEEE80211_SEND_MGMT(ni, 257 IEEE80211_FC0_SUBTYPE_DISASSOC, 258 IEEE80211_REASON_ASSOC_LEAVE); 259 ieee80211_sta_leave(ni); 260 break; 261 case IEEE80211_S_ASSOC: 262 IEEE80211_SEND_MGMT(ni, 263 IEEE80211_FC0_SUBTYPE_DEAUTH, 264 IEEE80211_REASON_AUTH_LEAVE); 265 break; 266 case IEEE80211_S_SCAN: 267 ieee80211_cancel_scan(vap); 268 break; 269 default: 270 break; 271 } 272 if (ostate != IEEE80211_S_INIT) { 273 /* NB: optimize INIT -> INIT case */ 274 ieee80211_reset_bss(vap); 275 } 276 if (vap->iv_auth->ia_detach != NULL) 277 vap->iv_auth->ia_detach(vap); 278 break; 279 case IEEE80211_S_SCAN: 280 switch (ostate) { 281 case IEEE80211_S_INIT: 282 /* 283 * Initiate a scan. We can come here as a result 284 * of an IEEE80211_IOC_SCAN_REQ too in which case 285 * the vap will be marked with IEEE80211_FEXT_SCANREQ 286 * and the scan request parameters will be present 287 * in iv_scanreq. Otherwise we do the default. 288 */ 289 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 290 ieee80211_check_scan(vap, 291 vap->iv_scanreq_flags, 292 vap->iv_scanreq_duration, 293 vap->iv_scanreq_mindwell, 294 vap->iv_scanreq_maxdwell, 295 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 296 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 297 } else 298 ieee80211_check_scan_current(vap); 299 break; 300 case IEEE80211_S_SCAN: 301 case IEEE80211_S_AUTH: 302 case IEEE80211_S_ASSOC: 303 /* 304 * These can happen either because of a timeout 305 * on an assoc/auth response or because of a 306 * change in state that requires a reset. For 307 * the former we're called with a non-zero arg 308 * that is the cause for the failure; pass this 309 * to the scan code so it can update state. 310 * Otherwise trigger a new scan unless we're in 311 * manual roaming mode in which case an application 312 * must issue an explicit scan request. 313 */ 314 if (arg != 0) 315 ieee80211_scan_assoc_fail(vap, 316 vap->iv_bss->ni_macaddr, arg); 317 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 318 ieee80211_check_scan_current(vap); 319 break; 320 case IEEE80211_S_SLEEP: /* beacon miss */ 321 /* 322 * XXX if in sleep we need to wakeup the hardware. 323 */ 324 /* FALLTHROUGH */ 325 case IEEE80211_S_RUN: /* beacon miss */ 326 /* 327 * Beacon miss. Notify user space and if not 328 * under control of a user application (roaming 329 * manual) kick off a scan to re-connect. 330 */ 331 332 ieee80211_sta_leave(ni); 333 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 334 ieee80211_check_scan_current(vap); 335 break; 336 default: 337 goto invalid; 338 } 339 break; 340 case IEEE80211_S_AUTH: 341 switch (ostate) { 342 case IEEE80211_S_INIT: 343 case IEEE80211_S_SCAN: 344 IEEE80211_SEND_MGMT(ni, 345 IEEE80211_FC0_SUBTYPE_AUTH, 1); 346 break; 347 case IEEE80211_S_AUTH: 348 case IEEE80211_S_ASSOC: 349 switch (arg & 0xff) { 350 case IEEE80211_FC0_SUBTYPE_AUTH: 351 /* ??? */ 352 IEEE80211_SEND_MGMT(ni, 353 IEEE80211_FC0_SUBTYPE_AUTH, 2); 354 break; 355 case IEEE80211_FC0_SUBTYPE_DEAUTH: 356 sta_authretry(vap, ni, arg>>8); 357 break; 358 } 359 break; 360 case IEEE80211_S_SLEEP: 361 case IEEE80211_S_RUN: 362 switch (arg & 0xff) { 363 case IEEE80211_FC0_SUBTYPE_AUTH: 364 IEEE80211_SEND_MGMT(ni, 365 IEEE80211_FC0_SUBTYPE_AUTH, 2); 366 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 367 break; 368 case IEEE80211_FC0_SUBTYPE_DEAUTH: 369 ieee80211_sta_leave(ni); 370 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 371 /* try to reauth */ 372 IEEE80211_SEND_MGMT(ni, 373 IEEE80211_FC0_SUBTYPE_AUTH, 1); 374 } 375 break; 376 } 377 break; 378 default: 379 goto invalid; 380 } 381 break; 382 case IEEE80211_S_ASSOC: 383 switch (ostate) { 384 case IEEE80211_S_AUTH: 385 case IEEE80211_S_ASSOC: 386 IEEE80211_SEND_MGMT(ni, 387 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 388 break; 389 case IEEE80211_S_SLEEP: /* cannot happen */ 390 case IEEE80211_S_RUN: 391 ieee80211_sta_leave(ni); 392 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 393 IEEE80211_SEND_MGMT(ni, arg ? 394 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 395 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 396 } 397 break; 398 default: 399 goto invalid; 400 } 401 break; 402 case IEEE80211_S_RUN: 403 if (vap->iv_flags & IEEE80211_F_WPA) { 404 /* XXX validate prerequisites */ 405 } 406 switch (ostate) { 407 case IEEE80211_S_RUN: 408 case IEEE80211_S_CSA: 409 break; 410 case IEEE80211_S_AUTH: /* when join is done in fw */ 411 case IEEE80211_S_ASSOC: 412 #ifdef IEEE80211_DEBUG 413 if (ieee80211_msg_debug(vap)) { 414 ieee80211_note(vap, "%s with %s ssid ", 415 (vap->iv_opmode == IEEE80211_M_STA ? 416 "associated" : "synchronized"), 417 ether_sprintf(ni->ni_bssid)); 418 ieee80211_print_essid(vap->iv_bss->ni_essid, 419 ni->ni_esslen); 420 /* XXX MCS/HT */ 421 printf(" channel %d start %uMb\n", 422 ieee80211_chan2ieee(ic, ic->ic_curchan), 423 IEEE80211_RATE2MBS(ni->ni_txrate)); 424 } 425 #endif 426 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 427 ieee80211_notify_node_join(ni, 428 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 429 break; 430 case IEEE80211_S_SLEEP: 431 /* Wake up from sleep */ 432 vap->iv_sta_ps(vap, 0); 433 break; 434 default: 435 goto invalid; 436 } 437 ieee80211_sync_curchan(ic); 438 if (ostate != IEEE80211_S_RUN) 439 sta_swbmiss_start(vap); 440 /* 441 * When 802.1x is not in use mark the port authorized 442 * at this point so traffic can flow. 443 */ 444 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 445 ieee80211_node_authorize(ni); 446 /* 447 * Fake association when joining an existing bss. 448 * 449 * Don't do this if we're doing SLEEP->RUN. 450 */ 451 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 452 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 453 break; 454 case IEEE80211_S_CSA: 455 if (ostate != IEEE80211_S_RUN) 456 goto invalid; 457 break; 458 case IEEE80211_S_SLEEP: 459 sta_swbmiss_start(vap); 460 vap->iv_sta_ps(vap, 1); 461 break; 462 default: 463 invalid: 464 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 465 "%s: unexpected state transition %s -> %s\n", __func__, 466 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 467 break; 468 } 469 return 0; 470 } 471 472 /* 473 * Return non-zero if the frame is an echo of a multicast 474 * frame sent by ourself. The dir is known to be DSTODS. 475 */ 476 static __inline int 477 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 478 { 479 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 480 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 481 const uint8_t *sa; 482 483 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 484 485 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 486 return 0; 487 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 488 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 489 #undef WH4 490 #undef QWH4 491 } 492 493 /* 494 * Return non-zero if the frame is an echo of a multicast 495 * frame sent by ourself. The dir is known to be FROMDS. 496 */ 497 static __inline int 498 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 499 { 500 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 501 502 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 503 return 0; 504 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 505 } 506 507 /* 508 * Decide if a received management frame should be 509 * printed when debugging is enabled. This filters some 510 * of the less interesting frames that come frequently 511 * (e.g. beacons). 512 */ 513 static __inline int 514 doprint(struct ieee80211vap *vap, int subtype) 515 { 516 switch (subtype) { 517 case IEEE80211_FC0_SUBTYPE_BEACON: 518 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 519 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 520 return 0; 521 } 522 return 1; 523 } 524 525 /* 526 * Process a received frame. The node associated with the sender 527 * should be supplied. If nothing was found in the node table then 528 * the caller is assumed to supply a reference to iv_bss instead. 529 * The RSSI and a timestamp are also supplied. The RSSI data is used 530 * during AP scanning to select a AP to associate with; it can have 531 * any units so long as values have consistent units and higher values 532 * mean ``better signal''. The receive timestamp is currently not used 533 * by the 802.11 layer. 534 */ 535 static int 536 sta_input(struct ieee80211_node *ni, struct mbuf *m, 537 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 538 { 539 struct ieee80211vap *vap = ni->ni_vap; 540 struct ieee80211com *ic = ni->ni_ic; 541 struct ifnet *ifp = vap->iv_ifp; 542 struct ieee80211_frame *wh; 543 struct ieee80211_key *key; 544 struct ether_header *eh; 545 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 546 uint8_t dir, type, subtype, qos; 547 uint8_t *bssid; 548 int is_hw_decrypted = 0; 549 int has_decrypted = 0; 550 551 KASSERT(ni != NULL, ("%s: null node, mbuf %p", __func__, m)); 552 553 /* Early init in case of early error case. */ 554 type = -1; 555 556 /* 557 * Bit of a cheat here, we use a pointer for a 3-address 558 * frame format but don't reference fields past outside 559 * ieee80211_frame_min (or other shorter frames) w/o first 560 * validating the data is present. 561 */ 562 wh = mtod(m, struct ieee80211_frame *); 563 564 if (m->m_pkthdr.len < 2 || m->m_pkthdr.len < ieee80211_anyhdrsize(wh)) { 565 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 566 ni->ni_macaddr, NULL, 567 "too short (1): len %u", m->m_pkthdr.len); 568 vap->iv_stats.is_rx_tooshort++; 569 goto err; 570 } 571 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) { 572 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 573 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 574 wh->i_fc[0], wh->i_fc[1]); 575 vap->iv_stats.is_rx_badversion++; 576 goto err; 577 } 578 579 /* 580 * Some devices do hardware decryption all the way through 581 * to pretending the frame wasn't encrypted in the first place. 582 * So, tag it appropriately so it isn't discarded inappropriately. 583 */ 584 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 585 is_hw_decrypted = 1; 586 587 if (m->m_flags & M_AMPDU_MPDU) { 588 /* 589 * Fastpath for A-MPDU reorder q resubmission. Frames 590 * w/ M_AMPDU_MPDU marked have already passed through 591 * here but were received out of order and been held on 592 * the reorder queue. When resubmitted they are marked 593 * with the M_AMPDU_MPDU flag and we can bypass most of 594 * the normal processing. 595 */ 596 type = IEEE80211_FC0_TYPE_DATA; 597 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 598 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA; 599 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 600 goto resubmit_ampdu; 601 } 602 603 ni->ni_inact = ni->ni_inact_reload; 604 605 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 606 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 607 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 608 /* 609 * Control frames are not folowing the header scheme of data and mgmt 610 * frames so we do not apply extra checks here. 611 * We probably should do checks on RA (+TA) where available for those 612 * too, but for now do not drop them. 613 */ 614 if (type != IEEE80211_FC0_TYPE_CTL && 615 (ic->ic_flags & IEEE80211_F_SCAN) == 0) { 616 bssid = wh->i_addr2; 617 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 618 /* not interested in */ 619 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 620 bssid, NULL, "%s", "not to bss"); 621 vap->iv_stats.is_rx_wrongbss++; 622 goto out; 623 } 624 625 /* 626 * Some devices may be in a promiscuous mode 627 * where they receive frames for multiple station 628 * addresses. 629 * 630 * If we receive a data frame that isn't 631 * destined to our VAP MAC, drop it. 632 * 633 * XXX TODO: This is only enforced when not scanning; 634 * XXX it assumes a software-driven scan will put the NIC 635 * XXX into a "no data frames" mode before setting this 636 * XXX flag. Otherwise it may be possible that we'll still 637 * XXX process data frames whilst scanning. 638 */ 639 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 640 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 641 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 642 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 643 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 644 vap->iv_stats.is_rx_wrongbss++; 645 goto out; 646 } 647 648 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 649 ni->ni_noise = nf; 650 if ( IEEE80211_HAS_SEQ(type, subtype) && 651 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 652 uint8_t tid = ieee80211_gettid(wh); 653 if (IEEE80211_QOS_HAS_SEQ(wh) && 654 TID_TO_WME_AC(tid) >= WME_AC_VI) 655 ic->ic_wme.wme_hipri_traffic++; 656 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs)) 657 goto out; 658 } 659 } 660 661 switch (type) { 662 case IEEE80211_FC0_TYPE_DATA: 663 hdrspace = ieee80211_hdrspace(ic, wh); 664 if (m->m_len < hdrspace && 665 (m = m_pullup(m, hdrspace)) == NULL) { 666 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 667 ni->ni_macaddr, NULL, 668 "data too short: expecting %u", hdrspace); 669 vap->iv_stats.is_rx_tooshort++; 670 goto out; /* XXX */ 671 } 672 /* 673 * Handle A-MPDU re-ordering. If the frame is to be 674 * processed directly then ieee80211_ampdu_reorder 675 * will return 0; otherwise it has consumed the mbuf 676 * and we should do nothing more with it. 677 */ 678 if ((m->m_flags & M_AMPDU) && 679 (dir == IEEE80211_FC1_DIR_FROMDS || 680 dir == IEEE80211_FC1_DIR_DSTODS) && 681 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 682 m = NULL; 683 goto out; 684 } 685 resubmit_ampdu: 686 if (dir == IEEE80211_FC1_DIR_FROMDS) { 687 if ((ifp->if_flags & IFF_SIMPLEX) && 688 isfromds_mcastecho(vap, wh)) { 689 /* 690 * In IEEE802.11 network, multicast 691 * packets sent from "me" are broadcast 692 * from the AP; silently discard for 693 * SIMPLEX interface. 694 */ 695 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 696 wh, "data", "%s", "multicast echo"); 697 vap->iv_stats.is_rx_mcastecho++; 698 goto out; 699 } 700 if ((vap->iv_flags & IEEE80211_F_DWDS) && 701 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 702 /* 703 * DWDS sta's must drop 3-address mcast frames 704 * as they will be sent separately as a 4-addr 705 * frame. Accepting the 3-addr frame will 706 * confuse the bridge into thinking the sending 707 * sta is located at the end of WDS link. 708 */ 709 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 710 "3-address data", "%s", "DWDS enabled"); 711 vap->iv_stats.is_rx_mcastecho++; 712 goto out; 713 } 714 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 715 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 716 IEEE80211_DISCARD(vap, 717 IEEE80211_MSG_INPUT, wh, "4-address data", 718 "%s", "DWDS not enabled"); 719 vap->iv_stats.is_rx_wrongdir++; 720 goto out; 721 } 722 if ((ifp->if_flags & IFF_SIMPLEX) && 723 isdstods_mcastecho(vap, wh)) { 724 /* 725 * In IEEE802.11 network, multicast 726 * packets sent from "me" are broadcast 727 * from the AP; silently discard for 728 * SIMPLEX interface. 729 */ 730 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 731 "4-address data", "%s", "multicast echo"); 732 vap->iv_stats.is_rx_mcastecho++; 733 goto out; 734 } 735 } else { 736 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 737 "data", "incorrect dir 0x%x", dir); 738 vap->iv_stats.is_rx_wrongdir++; 739 goto out; 740 } 741 742 /* 743 * Handle privacy requirements for hardware decryption 744 * devices. 745 * 746 * For those devices, a handful of things happen. 747 * 748 * + If IV has been stripped, then we can't run 749 * ieee80211_crypto_decap() - none of the key 750 * + If MIC has been stripped, we can't validate 751 * MIC here. 752 * + If MIC fails, then we need to communicate a 753 * MIC failure up to the stack - but we don't know 754 * which key was used. 755 */ 756 757 /* 758 * Handle privacy requirements. Note that we 759 * must not be preempted from here until after 760 * we (potentially) call ieee80211_crypto_demic; 761 * otherwise we may violate assumptions in the 762 * crypto cipher modules used to do delayed update 763 * of replay sequence numbers. 764 */ 765 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) { 766 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 767 /* 768 * Discard encrypted frames when privacy is off. 769 */ 770 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 771 wh, "WEP", "%s", "PRIVACY off"); 772 vap->iv_stats.is_rx_noprivacy++; 773 IEEE80211_NODE_STAT(ni, rx_noprivacy); 774 goto out; 775 } 776 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 777 /* NB: stats+msgs handled in crypto_decap */ 778 IEEE80211_NODE_STAT(ni, rx_wepfail); 779 goto out; 780 } 781 wh = mtod(m, struct ieee80211_frame *); 782 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 783 has_decrypted = 1; 784 } else { 785 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 786 key = NULL; 787 } 788 789 /* 790 * Save QoS bits for use below--before we strip the header. 791 */ 792 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA) 793 qos = ieee80211_getqos(wh)[0]; 794 else 795 qos = 0; 796 797 /* 798 * Next up, any fragmentation. 799 */ 800 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 801 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted); 802 if (m == NULL) { 803 /* Fragment dropped or frame not complete yet */ 804 goto out; 805 } 806 } 807 wh = NULL; /* no longer valid, catch any uses */ 808 809 /* 810 * Next strip any MSDU crypto bits. 811 * 812 * Note: we can't do MIC stripping/verification if the 813 * upper layer has stripped it. We have to check MIC 814 * ourselves. So, key may be NULL, but we have to check 815 * the RX status. 816 */ 817 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 818 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 819 ni->ni_macaddr, "data", "%s", "demic error"); 820 vap->iv_stats.is_rx_demicfail++; 821 IEEE80211_NODE_STAT(ni, rx_demicfail); 822 goto out; 823 } 824 825 /* copy to listener after decrypt */ 826 if (ieee80211_radiotap_active_vap(vap)) 827 ieee80211_radiotap_rx(vap, m); 828 need_tap = 0; 829 830 /* 831 * Finally, strip the 802.11 header. 832 */ 833 m = ieee80211_decap(vap, m, hdrspace, qos); 834 if (m == NULL) { 835 /* XXX mask bit to check for both */ 836 /* don't count Null data frames as errors */ 837 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 838 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 839 goto out; 840 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 841 ni->ni_macaddr, "data", "%s", "decap error"); 842 vap->iv_stats.is_rx_decap++; 843 IEEE80211_NODE_STAT(ni, rx_decap); 844 goto err; 845 } 846 if (!(qos & IEEE80211_QOS_AMSDU)) 847 eh = mtod(m, struct ether_header *); 848 else 849 eh = NULL; 850 if (!ieee80211_node_is_authorized(ni)) { 851 /* 852 * Deny any non-PAE frames received prior to 853 * authorization. For open/shared-key 854 * authentication the port is mark authorized 855 * after authentication completes. For 802.1x 856 * the port is not marked authorized by the 857 * authenticator until the handshake has completed. 858 */ 859 if (eh == NULL || 860 eh->ether_type != htons(ETHERTYPE_PAE)) { 861 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 862 ni->ni_macaddr, "data", "unauthorized or " 863 "unknown port: ether type 0x%x len %u", 864 eh == NULL ? -1 : eh->ether_type, 865 m->m_pkthdr.len); 866 vap->iv_stats.is_rx_unauth++; 867 IEEE80211_NODE_STAT(ni, rx_unauth); 868 goto err; 869 } 870 } else { 871 /* 872 * When denying unencrypted frames, discard 873 * any non-PAE frames received without encryption. 874 */ 875 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 876 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 877 (is_hw_decrypted == 0) && 878 (eh == NULL || 879 eh->ether_type != htons(ETHERTYPE_PAE))) { 880 /* 881 * Drop unencrypted frames. 882 */ 883 vap->iv_stats.is_rx_unencrypted++; 884 IEEE80211_NODE_STAT(ni, rx_unencrypted); 885 goto out; 886 } 887 } 888 /* XXX require HT? */ 889 if (qos & IEEE80211_QOS_AMSDU) { 890 m = ieee80211_decap_amsdu(ni, m); 891 if (m == NULL) 892 return IEEE80211_FC0_TYPE_DATA; 893 } else { 894 #ifdef IEEE80211_SUPPORT_SUPERG 895 m = ieee80211_decap_fastframe(vap, ni, m); 896 if (m == NULL) 897 return IEEE80211_FC0_TYPE_DATA; 898 #endif 899 } 900 ieee80211_deliver_data(vap, ni, m); 901 return IEEE80211_FC0_TYPE_DATA; 902 903 case IEEE80211_FC0_TYPE_MGT: 904 vap->iv_stats.is_rx_mgmt++; 905 IEEE80211_NODE_STAT(ni, rx_mgmt); 906 if (dir != IEEE80211_FC1_DIR_NODS) { 907 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 908 wh, "data", "incorrect dir 0x%x", dir); 909 vap->iv_stats.is_rx_wrongdir++; 910 goto err; 911 } 912 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 913 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 914 ni->ni_macaddr, "mgt", "too short: len %u", 915 m->m_pkthdr.len); 916 vap->iv_stats.is_rx_tooshort++; 917 goto out; 918 } 919 #ifdef IEEE80211_DEBUG 920 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 921 ieee80211_msg_dumppkts(vap)) { 922 if_printf(ifp, "received %s from %s rssi %d\n", 923 ieee80211_mgt_subtype_name(subtype), 924 ether_sprintf(wh->i_addr2), rssi); 925 } 926 #endif 927 928 /* 929 * Note: See above for hardware offload privacy requirements. 930 * It also applies here. 931 */ 932 933 /* 934 * Again, having encrypted flag set check would be good, but 935 * then we have to also handle crypto_decap() like above. 936 */ 937 if (IEEE80211_IS_PROTECTED(wh)) { 938 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 939 /* 940 * Only shared key auth frames with a challenge 941 * should be encrypted, discard all others. 942 */ 943 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 944 wh, ieee80211_mgt_subtype_name(subtype), 945 "%s", "WEP set but not permitted"); 946 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 947 goto out; 948 } 949 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 950 /* 951 * Discard encrypted frames when privacy is off. 952 */ 953 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 954 wh, "mgt", "%s", "WEP set but PRIVACY off"); 955 vap->iv_stats.is_rx_noprivacy++; 956 goto out; 957 } 958 hdrspace = ieee80211_hdrspace(ic, wh); 959 960 /* 961 * Again, if IV/MIC was stripped, then this whole 962 * setup will fail. That's going to need some poking. 963 */ 964 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 965 /* NB: stats+msgs handled in crypto_decap */ 966 goto out; 967 } 968 has_decrypted = 1; 969 wh = mtod(m, struct ieee80211_frame *); 970 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 971 } 972 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 973 goto out; 974 975 case IEEE80211_FC0_TYPE_CTL: 976 vap->iv_stats.is_rx_ctl++; 977 IEEE80211_NODE_STAT(ni, rx_ctrl); 978 vap->iv_recv_ctl(ni, m, subtype); 979 goto out; 980 981 default: 982 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 983 wh, NULL, "bad frame type 0x%x", type); 984 /* should not come here */ 985 break; 986 } 987 err: 988 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 989 out: 990 if (m != NULL) { 991 if (need_tap && ieee80211_radiotap_active_vap(vap)) 992 ieee80211_radiotap_rx(vap, m); 993 m_freem(m); 994 } 995 return type; 996 } 997 998 static void 999 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1000 int rssi, int nf, uint16_t seq, uint16_t status) 1001 { 1002 struct ieee80211vap *vap = ni->ni_vap; 1003 1004 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 1005 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1006 ni->ni_macaddr, "open auth", 1007 "bad sta auth mode %u", ni->ni_authmode); 1008 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 1009 return; 1010 } 1011 if (vap->iv_state != IEEE80211_S_AUTH || 1012 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1013 vap->iv_stats.is_rx_bad_auth++; 1014 return; 1015 } 1016 if (status != 0) { 1017 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1018 ni, "open auth failed (reason %d)", status); 1019 vap->iv_stats.is_rx_auth_fail++; 1020 vap->iv_stats.is_rx_authfail_code = status; 1021 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1022 IEEE80211_SCAN_FAIL_STATUS); 1023 } else 1024 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1025 } 1026 1027 static void 1028 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1029 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1030 uint16_t seq, uint16_t status) 1031 { 1032 struct ieee80211vap *vap = ni->ni_vap; 1033 uint8_t *challenge; 1034 1035 /* 1036 * NB: this can happen as we allow pre-shared key 1037 * authentication to be enabled w/o wep being turned 1038 * on so that configuration of these can be done 1039 * in any order. It may be better to enforce the 1040 * ordering in which case this check would just be 1041 * for sanity/consistency. 1042 */ 1043 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1044 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1045 ni->ni_macaddr, "shared key auth", 1046 "%s", " PRIVACY is disabled"); 1047 goto bad; 1048 } 1049 /* 1050 * Pre-shared key authentication is evil; accept 1051 * it only if explicitly configured (it is supported 1052 * mainly for compatibility with clients like OS X). 1053 */ 1054 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1055 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1056 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1057 ni->ni_macaddr, "shared key auth", 1058 "bad sta auth mode %u", ni->ni_authmode); 1059 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1060 goto bad; 1061 } 1062 1063 challenge = NULL; 1064 if (frm + 1 < efrm) { 1065 if ((frm[1] + 2) > (efrm - frm)) { 1066 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1067 ni->ni_macaddr, "shared key auth", 1068 "ie %d/%d too long", 1069 frm[0], (frm[1] + 2) - (efrm - frm)); 1070 vap->iv_stats.is_rx_bad_auth++; 1071 goto bad; 1072 } 1073 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1074 challenge = frm; 1075 frm += frm[1] + 2; 1076 } 1077 switch (seq) { 1078 case IEEE80211_AUTH_SHARED_CHALLENGE: 1079 case IEEE80211_AUTH_SHARED_RESPONSE: 1080 if (challenge == NULL) { 1081 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1082 ni->ni_macaddr, "shared key auth", 1083 "%s", "no challenge"); 1084 vap->iv_stats.is_rx_bad_auth++; 1085 goto bad; 1086 } 1087 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1088 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1089 ni->ni_macaddr, "shared key auth", 1090 "bad challenge len %d", challenge[1]); 1091 vap->iv_stats.is_rx_bad_auth++; 1092 goto bad; 1093 } 1094 default: 1095 break; 1096 } 1097 if (vap->iv_state != IEEE80211_S_AUTH) 1098 return; 1099 switch (seq) { 1100 case IEEE80211_AUTH_SHARED_PASS: 1101 if (ni->ni_challenge != NULL) { 1102 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1103 ni->ni_challenge = NULL; 1104 } 1105 if (status != 0) { 1106 IEEE80211_NOTE_FRAME(vap, 1107 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1108 "shared key auth failed (reason %d)", status); 1109 vap->iv_stats.is_rx_auth_fail++; 1110 vap->iv_stats.is_rx_authfail_code = status; 1111 return; 1112 } 1113 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1114 break; 1115 case IEEE80211_AUTH_SHARED_CHALLENGE: 1116 if (!ieee80211_alloc_challenge(ni)) 1117 return; 1118 /* XXX could optimize by passing recvd challenge */ 1119 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1120 IEEE80211_SEND_MGMT(ni, 1121 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1122 break; 1123 default: 1124 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1125 wh, "shared key auth", "bad seq %d", seq); 1126 vap->iv_stats.is_rx_bad_auth++; 1127 return; 1128 } 1129 return; 1130 bad: 1131 /* 1132 * Kick the state machine. This short-circuits 1133 * using the mgt frame timeout to trigger the 1134 * state transition. 1135 */ 1136 if (vap->iv_state == IEEE80211_S_AUTH) 1137 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1138 IEEE80211_SCAN_FAIL_STATUS); 1139 } 1140 1141 /* 1142 * Parse the WME IE for QoS and U-APSD information. 1143 * 1144 * Returns -1 if the IE isn't found, 1 if it's found. 1145 */ 1146 int 1147 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh, 1148 struct ieee80211_node *ni) 1149 { 1150 u_int len = frm[1]; 1151 1152 ni->ni_uapsd = 0; 1153 1154 if (len < sizeof(struct ieee80211_wme_param)-2) { 1155 IEEE80211_DISCARD_IE(ni->ni_vap, 1156 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1157 wh, "WME", "too short, len %u", len); 1158 return -1; 1159 } 1160 1161 ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET]; 1162 1163 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC, 1164 ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd); 1165 1166 return 1; 1167 } 1168 1169 int 1170 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1171 const struct ieee80211_frame *wh, uint8_t *qosinfo) 1172 { 1173 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1174 u_int len = frm[1], qosinfo_count; 1175 int i; 1176 1177 *qosinfo = 0; 1178 1179 if (len < sizeof(struct ieee80211_wme_param)-2) { 1180 IEEE80211_DISCARD_IE(vap, 1181 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1182 wh, "WME", "too short, len %u", len); 1183 return -1; 1184 } 1185 *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1186 qosinfo_count = *qosinfo & WME_QOSINFO_COUNT; 1187 1188 /* XXX do proper check for wraparound */ 1189 if (qosinfo_count == wme->wme_wmeChanParams.cap_info) 1190 return 0; 1191 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1192 for (i = 0; i < WME_NUM_AC; i++) { 1193 struct wmeParams *wmep = 1194 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1195 /* NB: ACI not used */ 1196 wmep->wmep_acm = _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_ACM); 1197 wmep->wmep_aifsn = 1198 _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_AIFSN); 1199 wmep->wmep_logcwmin = 1200 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMIN); 1201 wmep->wmep_logcwmax = 1202 _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMAX); 1203 wmep->wmep_txopLimit = le16dec(frm+2); 1204 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 1205 "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n", 1206 __func__, 1207 i, 1208 wmep->wmep_acm, 1209 wmep->wmep_aifsn, 1210 wmep->wmep_logcwmin, 1211 wmep->wmep_logcwmax, 1212 wmep->wmep_txopLimit); 1213 frm += 4; 1214 } 1215 wme->wme_wmeChanParams.cap_info = qosinfo_count; 1216 return 1; 1217 } 1218 1219 /* 1220 * Process 11h Channel Switch Announcement (CSA) ie. If this 1221 * is the first CSA then initiate the switch. Otherwise we 1222 * track state and trigger completion and/or cancel of the switch. 1223 * XXX should be public for IBSS use 1224 */ 1225 static void 1226 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1227 const struct ieee80211_frame *wh) 1228 { 1229 struct ieee80211com *ic = vap->iv_ic; 1230 const struct ieee80211_csa_ie *csa = 1231 (const struct ieee80211_csa_ie *) frm; 1232 1233 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1234 ("state %s", ieee80211_state_name[vap->iv_state])); 1235 1236 if (csa->csa_mode > 1) { 1237 IEEE80211_DISCARD_IE(vap, 1238 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1239 wh, "CSA", "invalid mode %u", csa->csa_mode); 1240 return; 1241 } 1242 IEEE80211_LOCK(ic); 1243 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1244 /* 1245 * Convert the channel number to a channel reference. We 1246 * try first to preserve turbo attribute of the current 1247 * channel then fallback. Note this will not work if the 1248 * CSA specifies a channel that requires a band switch (e.g. 1249 * 11a => 11g). This is intentional as 11h is defined only 1250 * for 5GHz/11a and because the switch does not involve a 1251 * reassociation, protocol state (capabilities, negotated 1252 * rates, etc) may/will be wrong. 1253 */ 1254 struct ieee80211_channel *c = 1255 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1256 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1257 if (c == NULL) { 1258 c = ieee80211_find_channel_byieee(ic, 1259 csa->csa_newchan, 1260 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1261 if (c == NULL) { 1262 IEEE80211_DISCARD_IE(vap, 1263 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1264 wh, "CSA", "invalid channel %u", 1265 csa->csa_newchan); 1266 goto done; 1267 } 1268 } 1269 #if IEEE80211_CSA_COUNT_MIN > 0 1270 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1271 /* 1272 * Require at least IEEE80211_CSA_COUNT_MIN count to 1273 * reduce the risk of being redirected by a fabricated 1274 * CSA. If a valid CSA is dropped we'll still get a 1275 * beacon miss when the AP leaves the channel so we'll 1276 * eventually follow to the new channel. 1277 * 1278 * NOTE: this violates the 11h spec that states that 1279 * count may be any value and if 0 then a switch 1280 * should happen asap. 1281 */ 1282 IEEE80211_DISCARD_IE(vap, 1283 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1284 wh, "CSA", "count %u too small, must be >= %u", 1285 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1286 goto done; 1287 } 1288 #endif 1289 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1290 } else { 1291 /* 1292 * Validate this ie against the initial CSA. We require 1293 * mode and channel not change and the count must be 1294 * monotonically decreasing. This may be pointless and 1295 * canceling the switch as a result may be too paranoid but 1296 * in the worst case if we drop out of CSA because of this 1297 * and the AP does move then we'll just end up taking a 1298 * beacon miss and scan to find the AP. 1299 * 1300 * XXX may want <= on count as we also process ProbeResp 1301 * frames and those may come in w/ the same count as the 1302 * previous beacon; but doing so leaves us open to a stuck 1303 * count until we add a dead-man timer 1304 */ 1305 if (!(csa->csa_count < ic->ic_csa_count && 1306 csa->csa_mode == ic->ic_csa_mode && 1307 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1308 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1309 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1310 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1311 ic->ic_csa_newchan, ic->ic_csa_count, 1312 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1313 ieee80211_csa_cancelswitch(ic); 1314 } else { 1315 if (csa->csa_count <= 1) 1316 ieee80211_csa_completeswitch(ic); 1317 else 1318 ic->ic_csa_count = csa->csa_count; 1319 } 1320 } 1321 done: 1322 IEEE80211_UNLOCK(ic); 1323 } 1324 1325 /* 1326 * Return non-zero if a background scan may be continued: 1327 * o bg scan is active 1328 * o no channel switch is pending 1329 * o there has not been any traffic recently 1330 * o no full-offload scan support (no need for explicitly continuing scan then) 1331 * 1332 * Note we do not check if there is an administrative enable; 1333 * this is only done to start the scan. We assume that any 1334 * change in state will be accompanied by a request to cancel 1335 * active scans which will otherwise cause this test to fail. 1336 */ 1337 static __inline int 1338 contbgscan(struct ieee80211vap *vap) 1339 { 1340 struct ieee80211com *ic = vap->iv_ic; 1341 1342 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1343 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1344 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) && 1345 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1346 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1347 } 1348 1349 /* 1350 * Return non-zero if a backgrond scan may be started: 1351 * o bg scanning is administratively enabled 1352 * o no channel switch is pending 1353 * o we are not boosted on a dynamic turbo channel 1354 * o there has not been a scan recently 1355 * o there has not been any traffic recently (don't check if full-offload scan) 1356 */ 1357 static __inline int 1358 startbgscan(struct ieee80211vap *vap) 1359 { 1360 struct ieee80211com *ic = vap->iv_ic; 1361 1362 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1363 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1364 #ifdef IEEE80211_SUPPORT_SUPERG 1365 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1366 #endif 1367 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1368 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) || 1369 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))); 1370 } 1371 1372 #ifdef notyet 1373 /* 1374 * Compare two quiet IEs and return if they are equivalent. 1375 * 1376 * The tbttcount isnt checked - that's not part of the configuration. 1377 */ 1378 static int 1379 compare_quiet_ie(const struct ieee80211_quiet_ie *q1, 1380 const struct ieee80211_quiet_ie *q2) 1381 { 1382 1383 if (q1->period != q2->period) 1384 return (0); 1385 if (le16dec(&q1->duration) != le16dec(&q2->duration)) 1386 return (0); 1387 if (le16dec(&q1->offset) != le16dec(&q2->offset)) 1388 return (0); 1389 return (1); 1390 } 1391 #endif 1392 1393 static void 1394 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1395 const struct ieee80211_rx_stats *rxs, 1396 int rssi, int nf) 1397 { 1398 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1399 struct ieee80211vap *vap = ni->ni_vap; 1400 struct ieee80211com *ic = ni->ni_ic; 1401 struct ieee80211_channel *rxchan = ic->ic_curchan; 1402 struct ieee80211_frame *wh; 1403 int ht_state_change = 0, do_ht = 0; 1404 uint8_t *frm, *efrm; 1405 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1406 uint8_t *vhtcap, *vhtopmode; 1407 uint8_t rate; 1408 uint8_t qosinfo; 1409 1410 wh = mtod(m0, struct ieee80211_frame *); 1411 frm = (uint8_t *)&wh[1]; 1412 efrm = mtod(m0, uint8_t *) + m0->m_len; 1413 switch (subtype) { 1414 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1415 case IEEE80211_FC0_SUBTYPE_BEACON: { 1416 struct ieee80211_scanparams scan; 1417 struct ieee80211_channel *c; 1418 /* 1419 * We process beacon/probe response frames: 1420 * o when scanning, or 1421 * o station mode when associated (to collect state 1422 * updates such as 802.11g slot time) 1423 * Frames otherwise received are discarded. 1424 */ 1425 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1426 vap->iv_stats.is_rx_mgtdiscard++; 1427 return; 1428 } 1429 1430 /* Override RX channel as appropriate */ 1431 if (rxs != NULL) { 1432 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1433 if (c != NULL) 1434 rxchan = c; 1435 } 1436 1437 /* XXX probe response in sta mode when !scanning? */ 1438 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1439 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1440 vap->iv_stats.is_beacon_bad++; 1441 return; 1442 } 1443 1444 /* 1445 * Count frame now that we know it's to be processed. 1446 */ 1447 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1448 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1449 IEEE80211_NODE_STAT(ni, rx_beacons); 1450 } else 1451 IEEE80211_NODE_STAT(ni, rx_proberesp); 1452 /* 1453 * When operating in station mode, check for state updates. 1454 * Be careful to ignore beacons received while doing a 1455 * background scan. We consider only 11g/WMM stuff right now. 1456 */ 1457 if (ni->ni_associd != 0 && 1458 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1459 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1460 /* record tsf of last beacon */ 1461 memcpy(ni->ni_tstamp.data, scan.tstamp, 1462 sizeof(ni->ni_tstamp)); 1463 /* count beacon frame for s/w bmiss handling */ 1464 vap->iv_swbmiss_count++; 1465 vap->iv_bmiss_count = 0; 1466 if (ni->ni_erp != scan.erp) { 1467 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1468 wh->i_addr2, 1469 "erp change: was 0x%x, now 0x%x", 1470 ni->ni_erp, scan.erp); 1471 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1472 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1473 vap->iv_flags |= IEEE80211_F_USEPROT; 1474 else 1475 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1476 ni->ni_erp = scan.erp; 1477 /* XXX statistic */ 1478 /* driver notification */ 1479 ieee80211_vap_update_erp_protmode(vap); 1480 } 1481 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1482 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1483 wh->i_addr2, 1484 "capabilities change: was 0x%x, now 0x%x", 1485 ni->ni_capinfo, scan.capinfo); 1486 /* 1487 * NB: we assume short preamble doesn't 1488 * change dynamically 1489 */ 1490 ieee80211_vap_set_shortslottime(vap, 1491 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1492 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1493 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1494 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1495 /* XXX statistic */ 1496 } 1497 if (scan.wme != NULL && 1498 (ni->ni_flags & IEEE80211_NODE_QOS)) { 1499 int _retval; 1500 if ((_retval = ieee80211_parse_wmeparams(vap, 1501 scan.wme, wh, &qosinfo)) >= 0) { 1502 if (qosinfo & WME_CAPINFO_UAPSD_EN) 1503 ni->ni_flags |= 1504 IEEE80211_NODE_UAPSD; 1505 if (_retval > 0) 1506 ieee80211_wme_updateparams(vap); 1507 } 1508 } else 1509 ni->ni_flags &= ~IEEE80211_NODE_UAPSD; 1510 #ifdef IEEE80211_SUPPORT_SUPERG 1511 if (scan.ath != NULL) 1512 ieee80211_parse_athparams(ni, scan.ath, wh); 1513 #endif 1514 if (scan.htcap != NULL && scan.htinfo != NULL && 1515 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1516 /* XXX state changes? */ 1517 ieee80211_ht_updateparams(ni, 1518 scan.htcap, scan.htinfo); 1519 do_ht = 1; 1520 } 1521 if (scan.vhtcap != NULL && scan.vhtopmode != NULL && 1522 (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) { 1523 /* XXX state changes? */ 1524 ieee80211_vht_updateparams(ni, 1525 scan.vhtcap, scan.vhtopmode); 1526 do_ht = 1; 1527 } 1528 if (do_ht) { 1529 if (ieee80211_ht_updateparams_final(ni, 1530 scan.htcap, scan.htinfo)) 1531 ht_state_change = 1; 1532 } 1533 1534 /* 1535 * If we have a quiet time IE then report it up to 1536 * the driver. 1537 * 1538 * Otherwise, inform the driver that the quiet time 1539 * IE has disappeared - only do that once rather than 1540 * spamming it each time. 1541 */ 1542 if (scan.quiet) { 1543 ic->ic_set_quiet(ni, scan.quiet); 1544 ni->ni_quiet_ie_set = 1; 1545 memcpy(&ni->ni_quiet_ie, scan.quiet, 1546 sizeof(struct ieee80211_quiet_ie)); 1547 } else { 1548 if (ni->ni_quiet_ie_set == 1) 1549 ic->ic_set_quiet(ni, NULL); 1550 ni->ni_quiet_ie_set = 0; 1551 bzero(&ni->ni_quiet_ie, 1552 sizeof(struct ieee80211_quiet_ie)); 1553 } 1554 1555 if (scan.tim != NULL) { 1556 struct ieee80211_tim_ie *tim = 1557 (struct ieee80211_tim_ie *) scan.tim; 1558 /* 1559 * XXX Check/debug this code; see if it's about 1560 * the right time to force the VAP awake if we 1561 * receive a frame destined for us? 1562 */ 1563 int aid = IEEE80211_AID(ni->ni_associd); 1564 int ix = aid / NBBY; 1565 int min = tim->tim_bitctl &~ 1; 1566 int max = tim->tim_len + min - 4; 1567 int tim_ucast = 0; 1568 #ifdef __notyet__ 1569 int tim_mcast = 0; 1570 #endif 1571 1572 /* 1573 * Only do this for unicast traffic in the TIM 1574 * The multicast traffic notification for 1575 * the scan notification stuff should occur 1576 * differently. 1577 */ 1578 if (min <= ix && ix <= max && 1579 isset(tim->tim_bitmap - min, aid)) { 1580 tim_ucast = 1; 1581 } 1582 1583 #ifdef __notyet__ 1584 /* 1585 * Do a separate notification 1586 * for the multicast bit being set. 1587 */ 1588 if (tim->tim_bitctl & 1) { 1589 tim_mcast = 1; 1590 } 1591 #endif 1592 1593 /* 1594 * If the TIM indicates there's traffic for 1595 * us then get us out of STA mode powersave. 1596 */ 1597 if (tim_ucast == 1) { 1598 /* 1599 * Wake us out of SLEEP state if we're 1600 * in it; and if we're doing bgscan 1601 * then wake us out of STA powersave. 1602 */ 1603 ieee80211_sta_tim_notify(vap, 1); 1604 1605 /* 1606 * This is preventing us from 1607 * continuing a bgscan; because it 1608 * tricks the contbgscan() 1609 * routine to think there's always 1610 * traffic for us. 1611 * 1612 * I think we need both an RX and 1613 * TX ic_lastdata field. 1614 */ 1615 ic->ic_lastdata = ticks; 1616 } 1617 1618 ni->ni_dtim_count = tim->tim_count; 1619 ni->ni_dtim_period = tim->tim_period; 1620 } 1621 if (scan.csa != NULL && 1622 (vap->iv_flags & IEEE80211_F_DOTH)) 1623 ieee80211_parse_csaparams(vap, scan.csa, wh); 1624 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1625 /* 1626 * No CSA ie or 11h disabled, but a channel 1627 * switch is pending; drop out so we aren't 1628 * stuck in CSA state. If the AP really is 1629 * moving we'll get a beacon miss and scan. 1630 */ 1631 IEEE80211_LOCK(ic); 1632 ieee80211_csa_cancelswitch(ic); 1633 IEEE80211_UNLOCK(ic); 1634 } 1635 /* 1636 * If scanning, pass the info to the scan module. 1637 * Otherwise, check if it's the right time to do 1638 * a background scan. Background scanning must 1639 * be enabled and we must not be operating in the 1640 * turbo phase of dynamic turbo mode. Then, 1641 * it's been a while since the last background 1642 * scan and if no data frames have come through 1643 * recently, kick off a scan. Note that this 1644 * is the mechanism by which a background scan 1645 * is started _and_ continued each time we 1646 * return on-channel to receive a beacon from 1647 * our ap. 1648 */ 1649 if (ic->ic_flags & IEEE80211_F_SCAN) { 1650 ieee80211_add_scan(vap, rxchan, 1651 &scan, wh, subtype, rssi, nf); 1652 } else if (contbgscan(vap)) { 1653 ieee80211_bg_scan(vap, 0); 1654 } else if (startbgscan(vap)) { 1655 vap->iv_stats.is_scan_bg++; 1656 #if 0 1657 /* wakeup if we are sleeing */ 1658 ieee80211_set_pwrsave(vap, 0); 1659 #endif 1660 ieee80211_bg_scan(vap, 0); 1661 } 1662 1663 /* 1664 * Put the station to sleep if we haven't seen 1665 * traffic in a while. 1666 */ 1667 IEEE80211_LOCK(ic); 1668 ieee80211_sta_ps_timer_check(vap); 1669 IEEE80211_UNLOCK(ic); 1670 1671 /* 1672 * If we've had a channel width change (eg HT20<->HT40) 1673 * then schedule a delayed driver notification. 1674 */ 1675 if (ht_state_change) 1676 ieee80211_update_chw(ic); 1677 return; 1678 } 1679 /* 1680 * If scanning, just pass information to the scan module. 1681 */ 1682 if (ic->ic_flags & IEEE80211_F_SCAN) { 1683 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1684 /* 1685 * Actively scanning a channel marked passive; 1686 * send a probe request now that we know there 1687 * is 802.11 traffic present. 1688 * 1689 * XXX check if the beacon we recv'd gives 1690 * us what we need and suppress the probe req 1691 */ 1692 ieee80211_probe_curchan(vap, true); 1693 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1694 } 1695 ieee80211_add_scan(vap, rxchan, &scan, wh, 1696 subtype, rssi, nf); 1697 return; 1698 } 1699 break; 1700 } 1701 1702 case IEEE80211_FC0_SUBTYPE_AUTH: { 1703 uint16_t algo, seq, status; 1704 /* 1705 * auth frame format 1706 * [2] algorithm 1707 * [2] sequence 1708 * [2] status 1709 * [tlv*] challenge 1710 */ 1711 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1712 algo = le16toh(*(uint16_t *)frm); 1713 seq = le16toh(*(uint16_t *)(frm + 2)); 1714 status = le16toh(*(uint16_t *)(frm + 4)); 1715 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1716 "recv auth frame with algorithm %d seq %d", algo, seq); 1717 1718 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1719 IEEE80211_DISCARD(vap, 1720 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1721 wh, "auth", "%s", "TKIP countermeasures enabled"); 1722 vap->iv_stats.is_rx_auth_countermeasures++; 1723 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1724 ieee80211_send_error(ni, wh->i_addr2, 1725 IEEE80211_FC0_SUBTYPE_AUTH, 1726 IEEE80211_REASON_MIC_FAILURE); 1727 } 1728 return; 1729 } 1730 if (algo == IEEE80211_AUTH_ALG_SHARED) 1731 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1732 seq, status); 1733 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1734 sta_auth_open(ni, wh, rssi, nf, seq, status); 1735 else { 1736 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1737 wh, "auth", "unsupported alg %d", algo); 1738 vap->iv_stats.is_rx_auth_unsupported++; 1739 return; 1740 } 1741 break; 1742 } 1743 1744 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1745 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1746 uint16_t capinfo, associd; 1747 uint16_t status; 1748 1749 if (vap->iv_state != IEEE80211_S_ASSOC) { 1750 vap->iv_stats.is_rx_mgtdiscard++; 1751 return; 1752 } 1753 1754 /* 1755 * asresp frame format 1756 * [2] capability information 1757 * [2] status 1758 * [2] association ID 1759 * [tlv] supported rates 1760 * [tlv] extended supported rates 1761 * [tlv] WME 1762 * [tlv] HT capabilities 1763 * [tlv] HT info 1764 */ 1765 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1766 ni = vap->iv_bss; 1767 capinfo = le16toh(*(uint16_t *)frm); 1768 frm += 2; 1769 status = le16toh(*(uint16_t *)frm); 1770 frm += 2; 1771 if (status != 0) { 1772 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1773 wh->i_addr2, "%sassoc failed (reason %d)", 1774 ISREASSOC(subtype) ? "re" : "", status); 1775 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1776 return; 1777 } 1778 associd = le16toh(*(uint16_t *)frm); 1779 frm += 2; 1780 1781 rates = xrates = wme = htcap = htinfo = NULL; 1782 vhtcap = vhtopmode = NULL; 1783 while (efrm - frm > 1) { 1784 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1785 switch (*frm) { 1786 case IEEE80211_ELEMID_RATES: 1787 rates = frm; 1788 break; 1789 case IEEE80211_ELEMID_XRATES: 1790 xrates = frm; 1791 break; 1792 case IEEE80211_ELEMID_HTCAP: 1793 htcap = frm; 1794 break; 1795 case IEEE80211_ELEMID_HTINFO: 1796 htinfo = frm; 1797 break; 1798 case IEEE80211_ELEMID_VENDOR: 1799 if (iswmeoui(frm)) 1800 wme = frm; 1801 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1802 /* 1803 * Accept pre-draft HT ie's if the 1804 * standard ones have not been seen. 1805 */ 1806 if (ishtcapoui(frm)) { 1807 if (htcap == NULL) 1808 htcap = frm; 1809 } else if (ishtinfooui(frm)) { 1810 if (htinfo == NULL) 1811 htinfo = frm; 1812 } 1813 } 1814 /* XXX Atheros OUI support */ 1815 break; 1816 case IEEE80211_ELEMID_VHT_CAP: 1817 vhtcap = frm; 1818 break; 1819 case IEEE80211_ELEMID_VHT_OPMODE: 1820 vhtopmode = frm; 1821 break; 1822 } 1823 frm += frm[1] + 2; 1824 } 1825 1826 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1827 if (xrates != NULL) 1828 IEEE80211_VERIFY_ELEMENT(xrates, 1829 IEEE80211_RATE_MAXSIZE - rates[1], return); 1830 rate = ieee80211_setup_rates(ni, rates, xrates, 1831 IEEE80211_F_JOIN | 1832 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1833 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1834 if (rate & IEEE80211_RATE_BASIC) { 1835 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1836 wh->i_addr2, 1837 "%sassoc failed (rate set mismatch)", 1838 ISREASSOC(subtype) ? "re" : ""); 1839 vap->iv_stats.is_rx_assoc_norate++; 1840 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1841 IEEE80211_SCAN_FAIL_STATUS); 1842 return; 1843 } 1844 1845 ni->ni_capinfo = capinfo; 1846 ni->ni_associd = associd; 1847 if (ni->ni_jointime == 0) 1848 ni->ni_jointime = time_uptime; 1849 if (wme != NULL && 1850 ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) { 1851 ni->ni_flags |= IEEE80211_NODE_QOS; 1852 ieee80211_wme_updateparams(vap); 1853 } else 1854 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1855 /* 1856 * Setup HT state according to the negotiation. 1857 * 1858 * NB: shouldn't need to check if HT use is enabled but some 1859 * ap's send back HT ie's even when we don't indicate we 1860 * are HT capable in our AssocReq. 1861 */ 1862 if (htcap != NULL && htinfo != NULL && 1863 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1864 ieee80211_ht_node_init(ni); 1865 ieee80211_ht_updateparams(ni, htcap, htinfo); 1866 1867 if ((vhtcap != NULL) && (vhtopmode != NULL) & 1868 (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) { 1869 /* 1870 * Log if we get a VHT assoc/reassoc response. 1871 * We aren't ready for 2GHz VHT support. 1872 */ 1873 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) { 1874 printf("%s: peer %6D: VHT on 2GHz, ignoring\n", 1875 __func__, 1876 ni->ni_macaddr, 1877 ":"); 1878 } else { 1879 ieee80211_vht_node_init(ni); 1880 ieee80211_vht_updateparams(ni, vhtcap, vhtopmode); 1881 ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode); 1882 } 1883 } 1884 1885 ieee80211_ht_updateparams_final(ni, htcap, htinfo); 1886 ieee80211_setup_htrates(ni, htcap, 1887 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1888 ieee80211_setup_basic_htrates(ni, htinfo); 1889 1890 ieee80211_node_setuptxparms(ni); 1891 ieee80211_ratectl_node_init(ni); 1892 } 1893 1894 /* 1895 * Always initialise FF/superg state; we can use this 1896 * for doing A-MSDU encapsulation as well. 1897 */ 1898 #ifdef IEEE80211_SUPPORT_SUPERG 1899 ieee80211_ff_node_init(ni); 1900 #endif 1901 1902 /* 1903 * Configure state now that we are associated. 1904 * 1905 * XXX may need different/additional driver callbacks? 1906 */ 1907 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1908 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1909 vap->iv_flags |= IEEE80211_F_SHPREAMBLE; 1910 vap->iv_flags &= ~IEEE80211_F_USEBARKER; 1911 } else { 1912 vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE; 1913 vap->iv_flags |= IEEE80211_F_USEBARKER; 1914 } 1915 ieee80211_vap_set_shortslottime(vap, 1916 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1917 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1918 ieee80211_vap_update_preamble(vap); 1919 /* 1920 * Honor ERP protection. 1921 * 1922 * NB: ni_erp should zero for non-11g operation. 1923 */ 1924 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1925 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1926 vap->iv_flags |= IEEE80211_F_USEPROT; 1927 else 1928 vap->iv_flags &= ~IEEE80211_F_USEPROT; 1929 ieee80211_vap_update_erp_protmode(vap); 1930 IEEE80211_NOTE_MAC(vap, 1931 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1932 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s", 1933 ISREASSOC(subtype) ? "re" : "", 1934 IEEE80211_NODE_AID(ni), 1935 vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1936 vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1937 vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1938 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1939 ni->ni_flags & IEEE80211_NODE_HT ? 1940 (ni->ni_chw == IEEE80211_STA_RX_BW_40 ? ", HT40" : ", HT20") : "", 1941 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1942 ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "", 1943 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1944 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1945 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1946 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1947 ", fast-frames" : "", 1948 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1949 ", turbo" : "" 1950 ); 1951 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1952 break; 1953 } 1954 1955 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1956 uint16_t reason; 1957 1958 if (vap->iv_state == IEEE80211_S_SCAN) { 1959 vap->iv_stats.is_rx_mgtdiscard++; 1960 return; 1961 } 1962 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1963 /* NB: can happen when in promiscuous mode */ 1964 vap->iv_stats.is_rx_mgtdiscard++; 1965 break; 1966 } 1967 1968 /* 1969 * deauth frame format 1970 * [2] reason 1971 */ 1972 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1973 reason = le16toh(*(uint16_t *)frm); 1974 1975 vap->iv_stats.is_rx_deauth++; 1976 vap->iv_stats.is_rx_deauth_code = reason; 1977 IEEE80211_NODE_STAT(ni, rx_deauth); 1978 1979 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1980 "recv deauthenticate (reason: %d (%s))", reason, 1981 ieee80211_reason_to_string(reason)); 1982 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1983 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1984 break; 1985 } 1986 1987 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1988 uint16_t reason; 1989 1990 if (vap->iv_state != IEEE80211_S_RUN && 1991 vap->iv_state != IEEE80211_S_ASSOC && 1992 vap->iv_state != IEEE80211_S_AUTH) { 1993 vap->iv_stats.is_rx_mgtdiscard++; 1994 return; 1995 } 1996 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1997 /* NB: can happen when in promiscuous mode */ 1998 vap->iv_stats.is_rx_mgtdiscard++; 1999 break; 2000 } 2001 2002 /* 2003 * disassoc frame format 2004 * [2] reason 2005 */ 2006 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2007 reason = le16toh(*(uint16_t *)frm); 2008 2009 vap->iv_stats.is_rx_disassoc++; 2010 vap->iv_stats.is_rx_disassoc_code = reason; 2011 IEEE80211_NODE_STAT(ni, rx_disassoc); 2012 2013 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2014 "recv disassociate (reason: %d (%s))", reason, 2015 ieee80211_reason_to_string(reason)); 2016 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 2017 break; 2018 } 2019 2020 case IEEE80211_FC0_SUBTYPE_ACTION: 2021 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2022 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2023 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2024 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2025 wh, NULL, "%s", "not for us"); 2026 vap->iv_stats.is_rx_mgtdiscard++; 2027 } else if (vap->iv_state != IEEE80211_S_RUN) { 2028 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2029 wh, NULL, "wrong state %s", 2030 ieee80211_state_name[vap->iv_state]); 2031 vap->iv_stats.is_rx_mgtdiscard++; 2032 } else { 2033 if (ieee80211_parse_action(ni, m0) == 0) 2034 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2035 } 2036 break; 2037 2038 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2039 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2040 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 2041 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 2042 case IEEE80211_FC0_SUBTYPE_ATIM: 2043 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2044 wh, NULL, "%s", "not handled"); 2045 vap->iv_stats.is_rx_mgtdiscard++; 2046 break; 2047 2048 default: 2049 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2050 wh, "mgt", "subtype 0x%x not handled", subtype); 2051 vap->iv_stats.is_rx_badsubtype++; 2052 break; 2053 } 2054 #undef ISREASSOC 2055 } 2056 2057 static void 2058 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2059 { 2060 switch (subtype) { 2061 case IEEE80211_FC0_SUBTYPE_BAR: 2062 ieee80211_recv_bar(ni, m); 2063 break; 2064 } 2065 } 2066