1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11 Station mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_media.h> 52 #include <net/if_llc.h> 53 #include <net/if_dl.h> 54 #include <net/if_var.h> 55 #include <net/ethernet.h> 56 57 #include <net/bpf.h> 58 59 #include <net80211/ieee80211_var.h> 60 #include <net80211/ieee80211_sta.h> 61 #include <net80211/ieee80211_input.h> 62 #ifdef IEEE80211_SUPPORT_SUPERG 63 #include <net80211/ieee80211_superg.h> 64 #endif 65 #include <net80211/ieee80211_ratectl.h> 66 #include <net80211/ieee80211_sta.h> 67 68 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 69 70 static void sta_vattach(struct ieee80211vap *); 71 static void sta_beacon_miss(struct ieee80211vap *); 72 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 73 static int sta_input(struct ieee80211_node *, struct mbuf *, 74 const struct ieee80211_rx_stats *, int, int); 75 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 77 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 78 79 void 80 ieee80211_sta_attach(struct ieee80211com *ic) 81 { 82 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 83 } 84 85 void 86 ieee80211_sta_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 sta_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 sta_vattach(struct ieee80211vap *vap) 97 { 98 vap->iv_newstate = sta_newstate; 99 vap->iv_input = sta_input; 100 vap->iv_recv_mgmt = sta_recv_mgmt; 101 vap->iv_recv_ctl = sta_recv_ctl; 102 vap->iv_opdetach = sta_vdetach; 103 vap->iv_bmiss = sta_beacon_miss; 104 } 105 106 /* 107 * Handle a beacon miss event. The common code filters out 108 * spurious events that can happen when scanning and/or before 109 * reaching RUN state. 110 */ 111 static void 112 sta_beacon_miss(struct ieee80211vap *vap) 113 { 114 struct ieee80211com *ic = vap->iv_ic; 115 116 IEEE80211_LOCK_ASSERT(ic); 117 118 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 119 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 120 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 121 122 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 123 "beacon miss, mode %s state %s\n", 124 ieee80211_opmode_name[vap->iv_opmode], 125 ieee80211_state_name[vap->iv_state]); 126 127 if (vap->iv_state == IEEE80211_S_CSA) { 128 /* 129 * A Channel Switch is pending; assume we missed the 130 * beacon that would've completed the process and just 131 * force the switch. If we made a mistake we'll not 132 * find the AP on the new channel and fall back to a 133 * normal scan. 134 */ 135 ieee80211_csa_completeswitch(ic); 136 return; 137 } 138 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 139 /* 140 * Send a directed probe req before falling back to a 141 * scan; if we receive a response ic_bmiss_count will 142 * be reset. Some cards mistakenly report beacon miss 143 * so this avoids the expensive scan if the ap is 144 * still there. 145 */ 146 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 147 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 148 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 149 return; 150 } 151 152 callout_stop(&vap->iv_swbmiss); 153 vap->iv_bmiss_count = 0; 154 vap->iv_stats.is_beacon_miss++; 155 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 156 #ifdef IEEE80211_SUPPORT_SUPERG 157 struct ieee80211com *ic = vap->iv_ic; 158 159 /* 160 * If we receive a beacon miss interrupt when using 161 * dynamic turbo, attempt to switch modes before 162 * reassociating. 163 */ 164 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 165 ieee80211_dturbo_switch(vap, 166 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 167 #endif 168 /* 169 * Try to reassociate before scanning for a new ap. 170 */ 171 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 172 } else { 173 /* 174 * Somebody else is controlling state changes (e.g. 175 * a user-mode app) don't do anything that would 176 * confuse them; just drop into scan mode so they'll 177 * notified of the state change and given control. 178 */ 179 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 180 } 181 } 182 183 /* 184 * Handle deauth with reason. We retry only for 185 * the cases where we might succeed. Otherwise 186 * we downgrade the ap and scan. 187 */ 188 static void 189 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 190 { 191 switch (reason) { 192 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 193 case IEEE80211_STATUS_TIMEOUT: 194 case IEEE80211_REASON_ASSOC_EXPIRE: 195 case IEEE80211_REASON_NOT_AUTHED: 196 case IEEE80211_REASON_NOT_ASSOCED: 197 case IEEE80211_REASON_ASSOC_LEAVE: 198 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 199 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 200 break; 201 default: 202 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 203 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 204 ieee80211_check_scan_current(vap); 205 break; 206 } 207 } 208 209 /* 210 * IEEE80211_M_STA vap state machine handler. 211 * This routine handles the main states in the 802.11 protocol. 212 */ 213 static int 214 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 215 { 216 struct ieee80211com *ic = vap->iv_ic; 217 struct ieee80211_node *ni; 218 enum ieee80211_state ostate; 219 220 IEEE80211_LOCK_ASSERT(ic); 221 222 ostate = vap->iv_state; 223 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 224 __func__, ieee80211_state_name[ostate], 225 ieee80211_state_name[nstate], arg); 226 vap->iv_state = nstate; /* state transition */ 227 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 228 if (ostate != IEEE80211_S_SCAN) 229 ieee80211_cancel_scan(vap); /* background scan */ 230 ni = vap->iv_bss; /* NB: no reference held */ 231 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 232 callout_stop(&vap->iv_swbmiss); 233 switch (nstate) { 234 case IEEE80211_S_INIT: 235 switch (ostate) { 236 case IEEE80211_S_SLEEP: 237 /* XXX wakeup */ 238 /* XXX driver hook to wakeup the hardware? */ 239 case IEEE80211_S_RUN: 240 IEEE80211_SEND_MGMT(ni, 241 IEEE80211_FC0_SUBTYPE_DISASSOC, 242 IEEE80211_REASON_ASSOC_LEAVE); 243 ieee80211_sta_leave(ni); 244 break; 245 case IEEE80211_S_ASSOC: 246 IEEE80211_SEND_MGMT(ni, 247 IEEE80211_FC0_SUBTYPE_DEAUTH, 248 IEEE80211_REASON_AUTH_LEAVE); 249 break; 250 case IEEE80211_S_SCAN: 251 ieee80211_cancel_scan(vap); 252 break; 253 default: 254 goto invalid; 255 } 256 if (ostate != IEEE80211_S_INIT) { 257 /* NB: optimize INIT -> INIT case */ 258 ieee80211_reset_bss(vap); 259 } 260 if (vap->iv_auth->ia_detach != NULL) 261 vap->iv_auth->ia_detach(vap); 262 break; 263 case IEEE80211_S_SCAN: 264 switch (ostate) { 265 case IEEE80211_S_INIT: 266 /* 267 * Initiate a scan. We can come here as a result 268 * of an IEEE80211_IOC_SCAN_REQ too in which case 269 * the vap will be marked with IEEE80211_FEXT_SCANREQ 270 * and the scan request parameters will be present 271 * in iv_scanreq. Otherwise we do the default. 272 */ 273 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 274 ieee80211_check_scan(vap, 275 vap->iv_scanreq_flags, 276 vap->iv_scanreq_duration, 277 vap->iv_scanreq_mindwell, 278 vap->iv_scanreq_maxdwell, 279 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 280 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 281 } else 282 ieee80211_check_scan_current(vap); 283 break; 284 case IEEE80211_S_SCAN: 285 case IEEE80211_S_AUTH: 286 case IEEE80211_S_ASSOC: 287 /* 288 * These can happen either because of a timeout 289 * on an assoc/auth response or because of a 290 * change in state that requires a reset. For 291 * the former we're called with a non-zero arg 292 * that is the cause for the failure; pass this 293 * to the scan code so it can update state. 294 * Otherwise trigger a new scan unless we're in 295 * manual roaming mode in which case an application 296 * must issue an explicit scan request. 297 */ 298 if (arg != 0) 299 ieee80211_scan_assoc_fail(vap, 300 vap->iv_bss->ni_macaddr, arg); 301 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 302 ieee80211_check_scan_current(vap); 303 break; 304 case IEEE80211_S_SLEEP: /* beacon miss */ 305 /* 306 * XXX if in sleep we need to wakeup the hardware. 307 */ 308 /* FALLTHROUGH */ 309 case IEEE80211_S_RUN: /* beacon miss */ 310 /* 311 * Beacon miss. Notify user space and if not 312 * under control of a user application (roaming 313 * manual) kick off a scan to re-connect. 314 */ 315 316 ieee80211_sta_leave(ni); 317 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 318 ieee80211_check_scan_current(vap); 319 break; 320 default: 321 goto invalid; 322 } 323 break; 324 case IEEE80211_S_AUTH: 325 switch (ostate) { 326 case IEEE80211_S_INIT: 327 case IEEE80211_S_SCAN: 328 IEEE80211_SEND_MGMT(ni, 329 IEEE80211_FC0_SUBTYPE_AUTH, 1); 330 break; 331 case IEEE80211_S_AUTH: 332 case IEEE80211_S_ASSOC: 333 switch (arg & 0xff) { 334 case IEEE80211_FC0_SUBTYPE_AUTH: 335 /* ??? */ 336 IEEE80211_SEND_MGMT(ni, 337 IEEE80211_FC0_SUBTYPE_AUTH, 2); 338 break; 339 case IEEE80211_FC0_SUBTYPE_DEAUTH: 340 sta_authretry(vap, ni, arg>>8); 341 break; 342 } 343 break; 344 case IEEE80211_S_RUN: 345 switch (arg & 0xff) { 346 case IEEE80211_FC0_SUBTYPE_AUTH: 347 IEEE80211_SEND_MGMT(ni, 348 IEEE80211_FC0_SUBTYPE_AUTH, 2); 349 vap->iv_state = ostate; /* stay RUN */ 350 break; 351 case IEEE80211_FC0_SUBTYPE_DEAUTH: 352 ieee80211_sta_leave(ni); 353 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 354 /* try to reauth */ 355 IEEE80211_SEND_MGMT(ni, 356 IEEE80211_FC0_SUBTYPE_AUTH, 1); 357 } 358 break; 359 } 360 break; 361 default: 362 goto invalid; 363 } 364 break; 365 case IEEE80211_S_ASSOC: 366 switch (ostate) { 367 case IEEE80211_S_AUTH: 368 case IEEE80211_S_ASSOC: 369 IEEE80211_SEND_MGMT(ni, 370 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 371 break; 372 case IEEE80211_S_SLEEP: /* cannot happen */ 373 case IEEE80211_S_RUN: 374 ieee80211_sta_leave(ni); 375 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 376 IEEE80211_SEND_MGMT(ni, arg ? 377 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 378 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 379 } 380 break; 381 default: 382 goto invalid; 383 } 384 break; 385 case IEEE80211_S_RUN: 386 if (vap->iv_flags & IEEE80211_F_WPA) { 387 /* XXX validate prerequisites */ 388 } 389 switch (ostate) { 390 case IEEE80211_S_RUN: 391 case IEEE80211_S_CSA: 392 break; 393 case IEEE80211_S_AUTH: /* when join is done in fw */ 394 case IEEE80211_S_ASSOC: 395 #ifdef IEEE80211_DEBUG 396 if (ieee80211_msg_debug(vap)) { 397 ieee80211_note(vap, "%s with %s ssid ", 398 (vap->iv_opmode == IEEE80211_M_STA ? 399 "associated" : "synchronized"), 400 ether_sprintf(ni->ni_bssid)); 401 ieee80211_print_essid(vap->iv_bss->ni_essid, 402 ni->ni_esslen); 403 /* XXX MCS/HT */ 404 printf(" channel %d start %uMb\n", 405 ieee80211_chan2ieee(ic, ic->ic_curchan), 406 IEEE80211_RATE2MBS(ni->ni_txrate)); 407 } 408 #endif 409 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 410 ieee80211_notify_node_join(ni, 411 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 412 break; 413 case IEEE80211_S_SLEEP: 414 /* Wake up from sleep */ 415 vap->iv_sta_ps(vap, 0); 416 break; 417 default: 418 goto invalid; 419 } 420 ieee80211_sync_curchan(ic); 421 if (ostate != IEEE80211_S_RUN && 422 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 423 /* 424 * Start s/w beacon miss timer for devices w/o 425 * hardware support. We fudge a bit here since 426 * we're doing this in software. 427 */ 428 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 429 2 * vap->iv_bmissthreshold * ni->ni_intval); 430 vap->iv_swbmiss_count = 0; 431 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 432 ieee80211_swbmiss, vap); 433 } 434 /* 435 * When 802.1x is not in use mark the port authorized 436 * at this point so traffic can flow. 437 */ 438 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 439 ieee80211_node_authorize(ni); 440 /* 441 * Fake association when joining an existing bss. 442 * 443 * Don't do this if we're doing SLEEP->RUN. 444 */ 445 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 446 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 447 break; 448 case IEEE80211_S_CSA: 449 if (ostate != IEEE80211_S_RUN) 450 goto invalid; 451 break; 452 case IEEE80211_S_SLEEP: 453 vap->iv_sta_ps(vap, 1); 454 break; 455 default: 456 invalid: 457 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 458 "%s: unexpected state transition %s -> %s\n", __func__, 459 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 460 break; 461 } 462 return 0; 463 } 464 465 /* 466 * Return non-zero if the frame is an echo of a multicast 467 * frame sent by ourself. The dir is known to be DSTODS. 468 */ 469 static __inline int 470 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 471 { 472 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 473 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 474 const uint8_t *sa; 475 476 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 477 478 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 479 return 0; 480 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 481 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 482 #undef WH4 483 #undef QWH4 484 } 485 486 /* 487 * Return non-zero if the frame is an echo of a multicast 488 * frame sent by ourself. The dir is known to be FROMDS. 489 */ 490 static __inline int 491 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 492 { 493 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 494 495 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 496 return 0; 497 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 498 } 499 500 /* 501 * Decide if a received management frame should be 502 * printed when debugging is enabled. This filters some 503 * of the less interesting frames that come frequently 504 * (e.g. beacons). 505 */ 506 static __inline int 507 doprint(struct ieee80211vap *vap, int subtype) 508 { 509 switch (subtype) { 510 case IEEE80211_FC0_SUBTYPE_BEACON: 511 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 512 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 513 return 0; 514 } 515 return 1; 516 } 517 518 /* 519 * Process a received frame. The node associated with the sender 520 * should be supplied. If nothing was found in the node table then 521 * the caller is assumed to supply a reference to iv_bss instead. 522 * The RSSI and a timestamp are also supplied. The RSSI data is used 523 * during AP scanning to select a AP to associate with; it can have 524 * any units so long as values have consistent units and higher values 525 * mean ``better signal''. The receive timestamp is currently not used 526 * by the 802.11 layer. 527 */ 528 static int 529 sta_input(struct ieee80211_node *ni, struct mbuf *m, 530 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 531 { 532 struct ieee80211vap *vap = ni->ni_vap; 533 struct ieee80211com *ic = ni->ni_ic; 534 struct ifnet *ifp = vap->iv_ifp; 535 struct ieee80211_frame *wh; 536 struct ieee80211_key *key; 537 struct ether_header *eh; 538 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 539 uint8_t dir, type, subtype, qos; 540 uint8_t *bssid; 541 uint16_t rxseq; 542 543 if (m->m_flags & M_AMPDU_MPDU) { 544 /* 545 * Fastpath for A-MPDU reorder q resubmission. Frames 546 * w/ M_AMPDU_MPDU marked have already passed through 547 * here but were received out of order and been held on 548 * the reorder queue. When resubmitted they are marked 549 * with the M_AMPDU_MPDU flag and we can bypass most of 550 * the normal processing. 551 */ 552 wh = mtod(m, struct ieee80211_frame *); 553 type = IEEE80211_FC0_TYPE_DATA; 554 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 555 subtype = IEEE80211_FC0_SUBTYPE_QOS; 556 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 557 goto resubmit_ampdu; 558 } 559 560 KASSERT(ni != NULL, ("null node")); 561 ni->ni_inact = ni->ni_inact_reload; 562 563 type = -1; /* undefined */ 564 565 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 567 ni->ni_macaddr, NULL, 568 "too short (1): len %u", m->m_pkthdr.len); 569 vap->iv_stats.is_rx_tooshort++; 570 goto out; 571 } 572 /* 573 * Bit of a cheat here, we use a pointer for a 3-address 574 * frame format but don't reference fields past outside 575 * ieee80211_frame_min w/o first validating the data is 576 * present. 577 */ 578 wh = mtod(m, struct ieee80211_frame *); 579 580 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 581 IEEE80211_FC0_VERSION_0) { 582 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 583 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 584 wh->i_fc[0], wh->i_fc[1]); 585 vap->iv_stats.is_rx_badversion++; 586 goto err; 587 } 588 589 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 590 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 591 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 592 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 593 bssid = wh->i_addr2; 594 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 595 /* not interested in */ 596 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 597 bssid, NULL, "%s", "not to bss"); 598 vap->iv_stats.is_rx_wrongbss++; 599 goto out; 600 } 601 602 /* 603 * Some devices may be in a promiscuous mode 604 * where they receive frames for multiple station 605 * addresses. 606 * 607 * If we receive a data frame that isn't 608 * destined to our VAP MAC, drop it. 609 * 610 * XXX TODO: This is only enforced when not scanning; 611 * XXX it assumes a software-driven scan will put the NIC 612 * XXX into a "no data frames" mode before setting this 613 * XXX flag. Otherwise it may be possible that we'll still 614 * XXX process data frames whilst scanning. 615 */ 616 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 617 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 619 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 620 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 621 vap->iv_stats.is_rx_wrongbss++; 622 goto out; 623 } 624 625 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 626 ni->ni_noise = nf; 627 if ( IEEE80211_HAS_SEQ(type, subtype) && 628 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 629 uint8_t tid = ieee80211_gettid(wh); 630 if (IEEE80211_QOS_HAS_SEQ(wh) && 631 TID_TO_WME_AC(tid) >= WME_AC_VI) 632 ic->ic_wme.wme_hipri_traffic++; 633 rxseq = le16toh(*(uint16_t *)wh->i_seq); 634 if (! ieee80211_check_rxseq(ni, wh)) { 635 /* duplicate, discard */ 636 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 637 bssid, "duplicate", 638 "seqno <%u,%u> fragno <%u,%u> tid %u", 639 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 640 ni->ni_rxseqs[tid] >> 641 IEEE80211_SEQ_SEQ_SHIFT, 642 rxseq & IEEE80211_SEQ_FRAG_MASK, 643 ni->ni_rxseqs[tid] & 644 IEEE80211_SEQ_FRAG_MASK, 645 tid); 646 vap->iv_stats.is_rx_dup++; 647 IEEE80211_NODE_STAT(ni, rx_dup); 648 goto out; 649 } 650 ni->ni_rxseqs[tid] = rxseq; 651 } 652 } 653 654 switch (type) { 655 case IEEE80211_FC0_TYPE_DATA: 656 hdrspace = ieee80211_hdrspace(ic, wh); 657 if (m->m_len < hdrspace && 658 (m = m_pullup(m, hdrspace)) == NULL) { 659 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 660 ni->ni_macaddr, NULL, 661 "data too short: expecting %u", hdrspace); 662 vap->iv_stats.is_rx_tooshort++; 663 goto out; /* XXX */ 664 } 665 /* 666 * Handle A-MPDU re-ordering. If the frame is to be 667 * processed directly then ieee80211_ampdu_reorder 668 * will return 0; otherwise it has consumed the mbuf 669 * and we should do nothing more with it. 670 */ 671 if ((m->m_flags & M_AMPDU) && 672 (dir == IEEE80211_FC1_DIR_FROMDS || 673 dir == IEEE80211_FC1_DIR_DSTODS) && 674 ieee80211_ampdu_reorder(ni, m) != 0) { 675 m = NULL; 676 goto out; 677 } 678 resubmit_ampdu: 679 if (dir == IEEE80211_FC1_DIR_FROMDS) { 680 if ((ifp->if_flags & IFF_SIMPLEX) && 681 isfromds_mcastecho(vap, wh)) { 682 /* 683 * In IEEE802.11 network, multicast 684 * packets sent from "me" are broadcast 685 * from the AP; silently discard for 686 * SIMPLEX interface. 687 */ 688 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 689 wh, "data", "%s", "multicast echo"); 690 vap->iv_stats.is_rx_mcastecho++; 691 goto out; 692 } 693 if ((vap->iv_flags & IEEE80211_F_DWDS) && 694 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 695 /* 696 * DWDS sta's must drop 3-address mcast frames 697 * as they will be sent separately as a 4-addr 698 * frame. Accepting the 3-addr frame will 699 * confuse the bridge into thinking the sending 700 * sta is located at the end of WDS link. 701 */ 702 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 703 "3-address data", "%s", "DWDS enabled"); 704 vap->iv_stats.is_rx_mcastecho++; 705 goto out; 706 } 707 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 708 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 709 IEEE80211_DISCARD(vap, 710 IEEE80211_MSG_INPUT, wh, "4-address data", 711 "%s", "DWDS not enabled"); 712 vap->iv_stats.is_rx_wrongdir++; 713 goto out; 714 } 715 if ((ifp->if_flags & IFF_SIMPLEX) && 716 isdstods_mcastecho(vap, wh)) { 717 /* 718 * In IEEE802.11 network, multicast 719 * packets sent from "me" are broadcast 720 * from the AP; silently discard for 721 * SIMPLEX interface. 722 */ 723 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 724 "4-address data", "%s", "multicast echo"); 725 vap->iv_stats.is_rx_mcastecho++; 726 goto out; 727 } 728 } else { 729 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 730 "data", "incorrect dir 0x%x", dir); 731 vap->iv_stats.is_rx_wrongdir++; 732 goto out; 733 } 734 735 /* 736 * Handle privacy requirements. Note that we 737 * must not be preempted from here until after 738 * we (potentially) call ieee80211_crypto_demic; 739 * otherwise we may violate assumptions in the 740 * crypto cipher modules used to do delayed update 741 * of replay sequence numbers. 742 */ 743 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 744 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 745 /* 746 * Discard encrypted frames when privacy is off. 747 */ 748 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 749 wh, "WEP", "%s", "PRIVACY off"); 750 vap->iv_stats.is_rx_noprivacy++; 751 IEEE80211_NODE_STAT(ni, rx_noprivacy); 752 goto out; 753 } 754 key = ieee80211_crypto_decap(ni, m, hdrspace); 755 if (key == NULL) { 756 /* NB: stats+msgs handled in crypto_decap */ 757 IEEE80211_NODE_STAT(ni, rx_wepfail); 758 goto out; 759 } 760 wh = mtod(m, struct ieee80211_frame *); 761 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 762 } else { 763 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 764 key = NULL; 765 } 766 767 /* 768 * Save QoS bits for use below--before we strip the header. 769 */ 770 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 771 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 772 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 773 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 774 } else 775 qos = 0; 776 777 /* 778 * Next up, any fragmentation. 779 */ 780 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 781 m = ieee80211_defrag(ni, m, hdrspace); 782 if (m == NULL) { 783 /* Fragment dropped or frame not complete yet */ 784 goto out; 785 } 786 } 787 wh = NULL; /* no longer valid, catch any uses */ 788 789 /* 790 * Next strip any MSDU crypto bits. 791 */ 792 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 793 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 794 ni->ni_macaddr, "data", "%s", "demic error"); 795 vap->iv_stats.is_rx_demicfail++; 796 IEEE80211_NODE_STAT(ni, rx_demicfail); 797 goto out; 798 } 799 800 /* copy to listener after decrypt */ 801 if (ieee80211_radiotap_active_vap(vap)) 802 ieee80211_radiotap_rx(vap, m); 803 need_tap = 0; 804 805 /* 806 * Finally, strip the 802.11 header. 807 */ 808 m = ieee80211_decap(vap, m, hdrspace); 809 if (m == NULL) { 810 /* XXX mask bit to check for both */ 811 /* don't count Null data frames as errors */ 812 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 813 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 814 goto out; 815 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 816 ni->ni_macaddr, "data", "%s", "decap error"); 817 vap->iv_stats.is_rx_decap++; 818 IEEE80211_NODE_STAT(ni, rx_decap); 819 goto err; 820 } 821 eh = mtod(m, struct ether_header *); 822 if (!ieee80211_node_is_authorized(ni)) { 823 /* 824 * Deny any non-PAE frames received prior to 825 * authorization. For open/shared-key 826 * authentication the port is mark authorized 827 * after authentication completes. For 802.1x 828 * the port is not marked authorized by the 829 * authenticator until the handshake has completed. 830 */ 831 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 832 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 833 eh->ether_shost, "data", 834 "unauthorized port: ether type 0x%x len %u", 835 eh->ether_type, m->m_pkthdr.len); 836 vap->iv_stats.is_rx_unauth++; 837 IEEE80211_NODE_STAT(ni, rx_unauth); 838 goto err; 839 } 840 } else { 841 /* 842 * When denying unencrypted frames, discard 843 * any non-PAE frames received without encryption. 844 */ 845 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 846 (key == NULL && (m->m_flags & M_WEP) == 0) && 847 eh->ether_type != htons(ETHERTYPE_PAE)) { 848 /* 849 * Drop unencrypted frames. 850 */ 851 vap->iv_stats.is_rx_unencrypted++; 852 IEEE80211_NODE_STAT(ni, rx_unencrypted); 853 goto out; 854 } 855 } 856 /* XXX require HT? */ 857 if (qos & IEEE80211_QOS_AMSDU) { 858 m = ieee80211_decap_amsdu(ni, m); 859 if (m == NULL) 860 return IEEE80211_FC0_TYPE_DATA; 861 } else { 862 #ifdef IEEE80211_SUPPORT_SUPERG 863 m = ieee80211_decap_fastframe(vap, ni, m); 864 if (m == NULL) 865 return IEEE80211_FC0_TYPE_DATA; 866 #endif 867 } 868 ieee80211_deliver_data(vap, ni, m); 869 return IEEE80211_FC0_TYPE_DATA; 870 871 case IEEE80211_FC0_TYPE_MGT: 872 vap->iv_stats.is_rx_mgmt++; 873 IEEE80211_NODE_STAT(ni, rx_mgmt); 874 if (dir != IEEE80211_FC1_DIR_NODS) { 875 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 876 wh, "data", "incorrect dir 0x%x", dir); 877 vap->iv_stats.is_rx_wrongdir++; 878 goto err; 879 } 880 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 881 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 882 ni->ni_macaddr, "mgt", "too short: len %u", 883 m->m_pkthdr.len); 884 vap->iv_stats.is_rx_tooshort++; 885 goto out; 886 } 887 #ifdef IEEE80211_DEBUG 888 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 889 ieee80211_msg_dumppkts(vap)) { 890 if_printf(ifp, "received %s from %s rssi %d\n", 891 ieee80211_mgt_subtype_name[subtype >> 892 IEEE80211_FC0_SUBTYPE_SHIFT], 893 ether_sprintf(wh->i_addr2), rssi); 894 } 895 #endif 896 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 897 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 898 /* 899 * Only shared key auth frames with a challenge 900 * should be encrypted, discard all others. 901 */ 902 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 903 wh, ieee80211_mgt_subtype_name[subtype >> 904 IEEE80211_FC0_SUBTYPE_SHIFT], 905 "%s", "WEP set but not permitted"); 906 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 907 goto out; 908 } 909 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 910 /* 911 * Discard encrypted frames when privacy is off. 912 */ 913 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 914 wh, "mgt", "%s", "WEP set but PRIVACY off"); 915 vap->iv_stats.is_rx_noprivacy++; 916 goto out; 917 } 918 hdrspace = ieee80211_hdrspace(ic, wh); 919 key = ieee80211_crypto_decap(ni, m, hdrspace); 920 if (key == NULL) { 921 /* NB: stats+msgs handled in crypto_decap */ 922 goto out; 923 } 924 wh = mtod(m, struct ieee80211_frame *); 925 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 926 } 927 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 928 goto out; 929 930 case IEEE80211_FC0_TYPE_CTL: 931 vap->iv_stats.is_rx_ctl++; 932 IEEE80211_NODE_STAT(ni, rx_ctrl); 933 vap->iv_recv_ctl(ni, m, subtype); 934 goto out; 935 936 default: 937 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 938 wh, NULL, "bad frame type 0x%x", type); 939 /* should not come here */ 940 break; 941 } 942 err: 943 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 944 out: 945 if (m != NULL) { 946 if (need_tap && ieee80211_radiotap_active_vap(vap)) 947 ieee80211_radiotap_rx(vap, m); 948 m_freem(m); 949 } 950 return type; 951 } 952 953 static void 954 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 955 int rssi, int nf, uint16_t seq, uint16_t status) 956 { 957 struct ieee80211vap *vap = ni->ni_vap; 958 959 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 960 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 961 ni->ni_macaddr, "open auth", 962 "bad sta auth mode %u", ni->ni_authmode); 963 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 964 return; 965 } 966 if (vap->iv_state != IEEE80211_S_AUTH || 967 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 968 vap->iv_stats.is_rx_bad_auth++; 969 return; 970 } 971 if (status != 0) { 972 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 973 ni, "open auth failed (reason %d)", status); 974 vap->iv_stats.is_rx_auth_fail++; 975 vap->iv_stats.is_rx_authfail_code = status; 976 ieee80211_new_state(vap, IEEE80211_S_SCAN, 977 IEEE80211_SCAN_FAIL_STATUS); 978 } else 979 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 980 } 981 982 static void 983 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 984 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 985 uint16_t seq, uint16_t status) 986 { 987 struct ieee80211vap *vap = ni->ni_vap; 988 uint8_t *challenge; 989 int estatus; 990 991 /* 992 * NB: this can happen as we allow pre-shared key 993 * authentication to be enabled w/o wep being turned 994 * on so that configuration of these can be done 995 * in any order. It may be better to enforce the 996 * ordering in which case this check would just be 997 * for sanity/consistency. 998 */ 999 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1000 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1001 ni->ni_macaddr, "shared key auth", 1002 "%s", " PRIVACY is disabled"); 1003 estatus = IEEE80211_STATUS_ALG; 1004 goto bad; 1005 } 1006 /* 1007 * Pre-shared key authentication is evil; accept 1008 * it only if explicitly configured (it is supported 1009 * mainly for compatibility with clients like OS X). 1010 */ 1011 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1012 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1013 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1014 ni->ni_macaddr, "shared key auth", 1015 "bad sta auth mode %u", ni->ni_authmode); 1016 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1017 estatus = IEEE80211_STATUS_ALG; 1018 goto bad; 1019 } 1020 1021 challenge = NULL; 1022 if (frm + 1 < efrm) { 1023 if ((frm[1] + 2) > (efrm - frm)) { 1024 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1025 ni->ni_macaddr, "shared key auth", 1026 "ie %d/%d too long", 1027 frm[0], (frm[1] + 2) - (efrm - frm)); 1028 vap->iv_stats.is_rx_bad_auth++; 1029 estatus = IEEE80211_STATUS_CHALLENGE; 1030 goto bad; 1031 } 1032 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1033 challenge = frm; 1034 frm += frm[1] + 2; 1035 } 1036 switch (seq) { 1037 case IEEE80211_AUTH_SHARED_CHALLENGE: 1038 case IEEE80211_AUTH_SHARED_RESPONSE: 1039 if (challenge == NULL) { 1040 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1041 ni->ni_macaddr, "shared key auth", 1042 "%s", "no challenge"); 1043 vap->iv_stats.is_rx_bad_auth++; 1044 estatus = IEEE80211_STATUS_CHALLENGE; 1045 goto bad; 1046 } 1047 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1048 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1049 ni->ni_macaddr, "shared key auth", 1050 "bad challenge len %d", challenge[1]); 1051 vap->iv_stats.is_rx_bad_auth++; 1052 estatus = IEEE80211_STATUS_CHALLENGE; 1053 goto bad; 1054 } 1055 default: 1056 break; 1057 } 1058 if (vap->iv_state != IEEE80211_S_AUTH) 1059 return; 1060 switch (seq) { 1061 case IEEE80211_AUTH_SHARED_PASS: 1062 if (ni->ni_challenge != NULL) { 1063 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1064 ni->ni_challenge = NULL; 1065 } 1066 if (status != 0) { 1067 IEEE80211_NOTE_FRAME(vap, 1068 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1069 "shared key auth failed (reason %d)", status); 1070 vap->iv_stats.is_rx_auth_fail++; 1071 vap->iv_stats.is_rx_authfail_code = status; 1072 return; 1073 } 1074 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1075 break; 1076 case IEEE80211_AUTH_SHARED_CHALLENGE: 1077 if (!ieee80211_alloc_challenge(ni)) 1078 return; 1079 /* XXX could optimize by passing recvd challenge */ 1080 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1081 IEEE80211_SEND_MGMT(ni, 1082 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1083 break; 1084 default: 1085 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1086 wh, "shared key auth", "bad seq %d", seq); 1087 vap->iv_stats.is_rx_bad_auth++; 1088 return; 1089 } 1090 return; 1091 bad: 1092 /* 1093 * Kick the state machine. This short-circuits 1094 * using the mgt frame timeout to trigger the 1095 * state transition. 1096 */ 1097 if (vap->iv_state == IEEE80211_S_AUTH) 1098 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1099 IEEE80211_SCAN_FAIL_STATUS); 1100 } 1101 1102 int 1103 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1104 const struct ieee80211_frame *wh) 1105 { 1106 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1107 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1108 u_int len = frm[1], qosinfo; 1109 int i; 1110 1111 if (len < sizeof(struct ieee80211_wme_param)-2) { 1112 IEEE80211_DISCARD_IE(vap, 1113 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1114 wh, "WME", "too short, len %u", len); 1115 return -1; 1116 } 1117 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1118 qosinfo &= WME_QOSINFO_COUNT; 1119 /* XXX do proper check for wraparound */ 1120 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1121 return 0; 1122 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1123 for (i = 0; i < WME_NUM_AC; i++) { 1124 struct wmeParams *wmep = 1125 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1126 /* NB: ACI not used */ 1127 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1128 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1129 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1130 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1131 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1132 frm += 4; 1133 } 1134 wme->wme_wmeChanParams.cap_info = qosinfo; 1135 return 1; 1136 #undef MS 1137 } 1138 1139 /* 1140 * Process 11h Channel Switch Announcement (CSA) ie. If this 1141 * is the first CSA then initiate the switch. Otherwise we 1142 * track state and trigger completion and/or cancel of the switch. 1143 * XXX should be public for IBSS use 1144 */ 1145 static void 1146 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1147 const struct ieee80211_frame *wh) 1148 { 1149 struct ieee80211com *ic = vap->iv_ic; 1150 const struct ieee80211_csa_ie *csa = 1151 (const struct ieee80211_csa_ie *) frm; 1152 1153 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1154 ("state %s", ieee80211_state_name[vap->iv_state])); 1155 1156 if (csa->csa_mode > 1) { 1157 IEEE80211_DISCARD_IE(vap, 1158 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1159 wh, "CSA", "invalid mode %u", csa->csa_mode); 1160 return; 1161 } 1162 IEEE80211_LOCK(ic); 1163 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1164 /* 1165 * Convert the channel number to a channel reference. We 1166 * try first to preserve turbo attribute of the current 1167 * channel then fallback. Note this will not work if the 1168 * CSA specifies a channel that requires a band switch (e.g. 1169 * 11a => 11g). This is intentional as 11h is defined only 1170 * for 5GHz/11a and because the switch does not involve a 1171 * reassociation, protocol state (capabilities, negotated 1172 * rates, etc) may/will be wrong. 1173 */ 1174 struct ieee80211_channel *c = 1175 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1176 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1177 if (c == NULL) { 1178 c = ieee80211_find_channel_byieee(ic, 1179 csa->csa_newchan, 1180 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1181 if (c == NULL) { 1182 IEEE80211_DISCARD_IE(vap, 1183 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1184 wh, "CSA", "invalid channel %u", 1185 csa->csa_newchan); 1186 goto done; 1187 } 1188 } 1189 #if IEEE80211_CSA_COUNT_MIN > 0 1190 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1191 /* 1192 * Require at least IEEE80211_CSA_COUNT_MIN count to 1193 * reduce the risk of being redirected by a fabricated 1194 * CSA. If a valid CSA is dropped we'll still get a 1195 * beacon miss when the AP leaves the channel so we'll 1196 * eventually follow to the new channel. 1197 * 1198 * NOTE: this violates the 11h spec that states that 1199 * count may be any value and if 0 then a switch 1200 * should happen asap. 1201 */ 1202 IEEE80211_DISCARD_IE(vap, 1203 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1204 wh, "CSA", "count %u too small, must be >= %u", 1205 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1206 goto done; 1207 } 1208 #endif 1209 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1210 } else { 1211 /* 1212 * Validate this ie against the initial CSA. We require 1213 * mode and channel not change and the count must be 1214 * monotonically decreasing. This may be pointless and 1215 * canceling the switch as a result may be too paranoid but 1216 * in the worst case if we drop out of CSA because of this 1217 * and the AP does move then we'll just end up taking a 1218 * beacon miss and scan to find the AP. 1219 * 1220 * XXX may want <= on count as we also process ProbeResp 1221 * frames and those may come in w/ the same count as the 1222 * previous beacon; but doing so leaves us open to a stuck 1223 * count until we add a dead-man timer 1224 */ 1225 if (!(csa->csa_count < ic->ic_csa_count && 1226 csa->csa_mode == ic->ic_csa_mode && 1227 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1228 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1229 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1230 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1231 ic->ic_csa_newchan, ic->ic_csa_count, 1232 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1233 ieee80211_csa_cancelswitch(ic); 1234 } else { 1235 if (csa->csa_count <= 1) 1236 ieee80211_csa_completeswitch(ic); 1237 else 1238 ic->ic_csa_count = csa->csa_count; 1239 } 1240 } 1241 done: 1242 IEEE80211_UNLOCK(ic); 1243 } 1244 1245 /* 1246 * Return non-zero if a background scan may be continued: 1247 * o bg scan is active 1248 * o no channel switch is pending 1249 * o there has not been any traffic recently 1250 * 1251 * Note we do not check if there is an administrative enable; 1252 * this is only done to start the scan. We assume that any 1253 * change in state will be accompanied by a request to cancel 1254 * active scans which will otherwise cause this test to fail. 1255 */ 1256 static __inline int 1257 contbgscan(struct ieee80211vap *vap) 1258 { 1259 struct ieee80211com *ic = vap->iv_ic; 1260 1261 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1262 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1263 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1264 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1265 } 1266 1267 /* 1268 * Return non-zero if a backgrond scan may be started: 1269 * o bg scanning is administratively enabled 1270 * o no channel switch is pending 1271 * o we are not boosted on a dynamic turbo channel 1272 * o there has not been a scan recently 1273 * o there has not been any traffic recently 1274 */ 1275 static __inline int 1276 startbgscan(struct ieee80211vap *vap) 1277 { 1278 struct ieee80211com *ic = vap->iv_ic; 1279 1280 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1281 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1282 #ifdef IEEE80211_SUPPORT_SUPERG 1283 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1284 #endif 1285 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1286 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1287 } 1288 1289 static void 1290 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1291 const struct ieee80211_rx_stats *rxs, 1292 int rssi, int nf) 1293 { 1294 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1295 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1296 struct ieee80211vap *vap = ni->ni_vap; 1297 struct ieee80211com *ic = ni->ni_ic; 1298 struct ieee80211_channel *rxchan = ic->ic_curchan; 1299 struct ieee80211_frame *wh; 1300 uint8_t *frm, *efrm; 1301 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1302 uint8_t rate; 1303 int ht_state_change = 0; 1304 1305 wh = mtod(m0, struct ieee80211_frame *); 1306 frm = (uint8_t *)&wh[1]; 1307 efrm = mtod(m0, uint8_t *) + m0->m_len; 1308 switch (subtype) { 1309 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1310 case IEEE80211_FC0_SUBTYPE_BEACON: { 1311 struct ieee80211_scanparams scan; 1312 struct ieee80211_channel *c; 1313 /* 1314 * We process beacon/probe response frames: 1315 * o when scanning, or 1316 * o station mode when associated (to collect state 1317 * updates such as 802.11g slot time) 1318 * Frames otherwise received are discarded. 1319 */ 1320 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1321 vap->iv_stats.is_rx_mgtdiscard++; 1322 return; 1323 } 1324 1325 /* Override RX channel as appropriate */ 1326 if (rxs != NULL) { 1327 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1328 if (c != NULL) 1329 rxchan = c; 1330 } 1331 1332 /* XXX probe response in sta mode when !scanning? */ 1333 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1334 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1335 vap->iv_stats.is_beacon_bad++; 1336 return; 1337 } 1338 1339 /* 1340 * Count frame now that we know it's to be processed. 1341 */ 1342 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1343 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1344 IEEE80211_NODE_STAT(ni, rx_beacons); 1345 } else 1346 IEEE80211_NODE_STAT(ni, rx_proberesp); 1347 /* 1348 * When operating in station mode, check for state updates. 1349 * Be careful to ignore beacons received while doing a 1350 * background scan. We consider only 11g/WMM stuff right now. 1351 */ 1352 if (ni->ni_associd != 0 && 1353 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1354 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1355 /* record tsf of last beacon */ 1356 memcpy(ni->ni_tstamp.data, scan.tstamp, 1357 sizeof(ni->ni_tstamp)); 1358 /* count beacon frame for s/w bmiss handling */ 1359 vap->iv_swbmiss_count++; 1360 vap->iv_bmiss_count = 0; 1361 if (ni->ni_erp != scan.erp) { 1362 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1363 wh->i_addr2, 1364 "erp change: was 0x%x, now 0x%x", 1365 ni->ni_erp, scan.erp); 1366 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1367 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1368 ic->ic_flags |= IEEE80211_F_USEPROT; 1369 else 1370 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1371 ni->ni_erp = scan.erp; 1372 /* XXX statistic */ 1373 /* XXX driver notification */ 1374 } 1375 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1376 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1377 wh->i_addr2, 1378 "capabilities change: was 0x%x, now 0x%x", 1379 ni->ni_capinfo, scan.capinfo); 1380 /* 1381 * NB: we assume short preamble doesn't 1382 * change dynamically 1383 */ 1384 ieee80211_set_shortslottime(ic, 1385 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1386 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1387 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1388 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1389 /* XXX statistic */ 1390 } 1391 if (scan.wme != NULL && 1392 (ni->ni_flags & IEEE80211_NODE_QOS) && 1393 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1394 ieee80211_wme_updateparams(vap); 1395 #ifdef IEEE80211_SUPPORT_SUPERG 1396 if (scan.ath != NULL) 1397 ieee80211_parse_athparams(ni, scan.ath, wh); 1398 #endif 1399 if (scan.htcap != NULL && scan.htinfo != NULL && 1400 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1401 /* XXX state changes? */ 1402 if (ieee80211_ht_updateparams(ni, 1403 scan.htcap, scan.htinfo)) 1404 ht_state_change = 1; 1405 } 1406 if (scan.quiet) 1407 ic->ic_set_quiet(ni, scan.quiet); 1408 1409 if (scan.tim != NULL) { 1410 struct ieee80211_tim_ie *tim = 1411 (struct ieee80211_tim_ie *) scan.tim; 1412 /* 1413 * XXX Check/debug this code; see if it's about 1414 * the right time to force the VAP awake if we 1415 * receive a frame destined for us? 1416 */ 1417 int aid = IEEE80211_AID(ni->ni_associd); 1418 int ix = aid / NBBY; 1419 int min = tim->tim_bitctl &~ 1; 1420 int max = tim->tim_len + min - 4; 1421 int tim_ucast = 0, tim_mcast = 0; 1422 1423 /* 1424 * Only do this for unicast traffic in the TIM 1425 * The multicast traffic notification for 1426 * the scan notification stuff should occur 1427 * differently. 1428 */ 1429 if (min <= ix && ix <= max && 1430 isset(tim->tim_bitmap - min, aid)) { 1431 tim_ucast = 1; 1432 } 1433 1434 /* 1435 * Do a separate notification 1436 * for the multicast bit being set. 1437 */ 1438 if (tim->tim_bitctl & 1) { 1439 tim_mcast = 1; 1440 } 1441 1442 /* 1443 * If the TIM indicates there's traffic for 1444 * us then get us out of STA mode powersave. 1445 */ 1446 if (tim_ucast == 1) { 1447 1448 /* 1449 * Wake us out of SLEEP state if we're 1450 * in it; and if we're doing bgscan 1451 * then wake us out of STA powersave. 1452 */ 1453 ieee80211_sta_tim_notify(vap, 1); 1454 1455 /* 1456 * This is preventing us from 1457 * continuing a bgscan; because it 1458 * tricks the contbgscan() 1459 * routine to think there's always 1460 * traffic for us. 1461 * 1462 * I think we need both an RX and 1463 * TX ic_lastdata field. 1464 */ 1465 ic->ic_lastdata = ticks; 1466 } 1467 1468 ni->ni_dtim_count = tim->tim_count; 1469 ni->ni_dtim_period = tim->tim_period; 1470 } 1471 if (scan.csa != NULL && 1472 (vap->iv_flags & IEEE80211_F_DOTH)) 1473 ieee80211_parse_csaparams(vap, scan.csa, wh); 1474 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1475 /* 1476 * No CSA ie or 11h disabled, but a channel 1477 * switch is pending; drop out so we aren't 1478 * stuck in CSA state. If the AP really is 1479 * moving we'll get a beacon miss and scan. 1480 */ 1481 IEEE80211_LOCK(ic); 1482 ieee80211_csa_cancelswitch(ic); 1483 IEEE80211_UNLOCK(ic); 1484 } 1485 /* 1486 * If scanning, pass the info to the scan module. 1487 * Otherwise, check if it's the right time to do 1488 * a background scan. Background scanning must 1489 * be enabled and we must not be operating in the 1490 * turbo phase of dynamic turbo mode. Then, 1491 * it's been a while since the last background 1492 * scan and if no data frames have come through 1493 * recently, kick off a scan. Note that this 1494 * is the mechanism by which a background scan 1495 * is started _and_ continued each time we 1496 * return on-channel to receive a beacon from 1497 * our ap. 1498 */ 1499 if (ic->ic_flags & IEEE80211_F_SCAN) { 1500 ieee80211_add_scan(vap, rxchan, 1501 &scan, wh, subtype, rssi, nf); 1502 } else if (contbgscan(vap)) { 1503 ieee80211_bg_scan(vap, 0); 1504 } else if (startbgscan(vap)) { 1505 vap->iv_stats.is_scan_bg++; 1506 #if 0 1507 /* wakeup if we are sleeing */ 1508 ieee80211_set_pwrsave(vap, 0); 1509 #endif 1510 ieee80211_bg_scan(vap, 0); 1511 } 1512 1513 /* 1514 * Put the station to sleep if we haven't seen 1515 * traffic in a while. 1516 */ 1517 IEEE80211_LOCK(ic); 1518 ieee80211_sta_ps_timer_check(vap); 1519 IEEE80211_UNLOCK(ic); 1520 1521 /* 1522 * If we've had a channel width change (eg HT20<->HT40) 1523 * then schedule a delayed driver notification. 1524 */ 1525 if (ht_state_change) 1526 ieee80211_update_chw(ic); 1527 return; 1528 } 1529 /* 1530 * If scanning, just pass information to the scan module. 1531 */ 1532 if (ic->ic_flags & IEEE80211_F_SCAN) { 1533 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1534 /* 1535 * Actively scanning a channel marked passive; 1536 * send a probe request now that we know there 1537 * is 802.11 traffic present. 1538 * 1539 * XXX check if the beacon we recv'd gives 1540 * us what we need and suppress the probe req 1541 */ 1542 ieee80211_probe_curchan(vap, 1); 1543 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1544 } 1545 ieee80211_add_scan(vap, rxchan, &scan, wh, 1546 subtype, rssi, nf); 1547 return; 1548 } 1549 break; 1550 } 1551 1552 case IEEE80211_FC0_SUBTYPE_AUTH: { 1553 uint16_t algo, seq, status; 1554 /* 1555 * auth frame format 1556 * [2] algorithm 1557 * [2] sequence 1558 * [2] status 1559 * [tlv*] challenge 1560 */ 1561 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1562 algo = le16toh(*(uint16_t *)frm); 1563 seq = le16toh(*(uint16_t *)(frm + 2)); 1564 status = le16toh(*(uint16_t *)(frm + 4)); 1565 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1566 "recv auth frame with algorithm %d seq %d", algo, seq); 1567 1568 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1569 IEEE80211_DISCARD(vap, 1570 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1571 wh, "auth", "%s", "TKIP countermeasures enabled"); 1572 vap->iv_stats.is_rx_auth_countermeasures++; 1573 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1574 ieee80211_send_error(ni, wh->i_addr2, 1575 IEEE80211_FC0_SUBTYPE_AUTH, 1576 IEEE80211_REASON_MIC_FAILURE); 1577 } 1578 return; 1579 } 1580 if (algo == IEEE80211_AUTH_ALG_SHARED) 1581 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1582 seq, status); 1583 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1584 sta_auth_open(ni, wh, rssi, nf, seq, status); 1585 else { 1586 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1587 wh, "auth", "unsupported alg %d", algo); 1588 vap->iv_stats.is_rx_auth_unsupported++; 1589 return; 1590 } 1591 break; 1592 } 1593 1594 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1595 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1596 uint16_t capinfo, associd; 1597 uint16_t status; 1598 1599 if (vap->iv_state != IEEE80211_S_ASSOC) { 1600 vap->iv_stats.is_rx_mgtdiscard++; 1601 return; 1602 } 1603 1604 /* 1605 * asresp frame format 1606 * [2] capability information 1607 * [2] status 1608 * [2] association ID 1609 * [tlv] supported rates 1610 * [tlv] extended supported rates 1611 * [tlv] WME 1612 * [tlv] HT capabilities 1613 * [tlv] HT info 1614 */ 1615 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1616 ni = vap->iv_bss; 1617 capinfo = le16toh(*(uint16_t *)frm); 1618 frm += 2; 1619 status = le16toh(*(uint16_t *)frm); 1620 frm += 2; 1621 if (status != 0) { 1622 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1623 wh->i_addr2, "%sassoc failed (reason %d)", 1624 ISREASSOC(subtype) ? "re" : "", status); 1625 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1626 return; 1627 } 1628 associd = le16toh(*(uint16_t *)frm); 1629 frm += 2; 1630 1631 rates = xrates = wme = htcap = htinfo = NULL; 1632 while (efrm - frm > 1) { 1633 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1634 switch (*frm) { 1635 case IEEE80211_ELEMID_RATES: 1636 rates = frm; 1637 break; 1638 case IEEE80211_ELEMID_XRATES: 1639 xrates = frm; 1640 break; 1641 case IEEE80211_ELEMID_HTCAP: 1642 htcap = frm; 1643 break; 1644 case IEEE80211_ELEMID_HTINFO: 1645 htinfo = frm; 1646 break; 1647 case IEEE80211_ELEMID_VENDOR: 1648 if (iswmeoui(frm)) 1649 wme = frm; 1650 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1651 /* 1652 * Accept pre-draft HT ie's if the 1653 * standard ones have not been seen. 1654 */ 1655 if (ishtcapoui(frm)) { 1656 if (htcap == NULL) 1657 htcap = frm; 1658 } else if (ishtinfooui(frm)) { 1659 if (htinfo == NULL) 1660 htinfo = frm; 1661 } 1662 } 1663 /* XXX Atheros OUI support */ 1664 break; 1665 } 1666 frm += frm[1] + 2; 1667 } 1668 1669 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1670 if (xrates != NULL) 1671 IEEE80211_VERIFY_ELEMENT(xrates, 1672 IEEE80211_RATE_MAXSIZE - rates[1], return); 1673 rate = ieee80211_setup_rates(ni, rates, xrates, 1674 IEEE80211_F_JOIN | 1675 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1676 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1677 if (rate & IEEE80211_RATE_BASIC) { 1678 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1679 wh->i_addr2, 1680 "%sassoc failed (rate set mismatch)", 1681 ISREASSOC(subtype) ? "re" : ""); 1682 vap->iv_stats.is_rx_assoc_norate++; 1683 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1684 IEEE80211_SCAN_FAIL_STATUS); 1685 return; 1686 } 1687 1688 ni->ni_capinfo = capinfo; 1689 ni->ni_associd = associd; 1690 if (ni->ni_jointime == 0) 1691 ni->ni_jointime = time_uptime; 1692 if (wme != NULL && 1693 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1694 ni->ni_flags |= IEEE80211_NODE_QOS; 1695 ieee80211_wme_updateparams(vap); 1696 } else 1697 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1698 /* 1699 * Setup HT state according to the negotiation. 1700 * 1701 * NB: shouldn't need to check if HT use is enabled but some 1702 * ap's send back HT ie's even when we don't indicate we 1703 * are HT capable in our AssocReq. 1704 */ 1705 if (htcap != NULL && htinfo != NULL && 1706 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1707 ieee80211_ht_node_init(ni); 1708 ieee80211_ht_updateparams(ni, htcap, htinfo); 1709 ieee80211_setup_htrates(ni, htcap, 1710 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1711 ieee80211_setup_basic_htrates(ni, htinfo); 1712 ieee80211_node_setuptxparms(ni); 1713 ieee80211_ratectl_node_init(ni); 1714 } else { 1715 #ifdef IEEE80211_SUPPORT_SUPERG 1716 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1717 ieee80211_ff_node_init(ni); 1718 #endif 1719 } 1720 /* 1721 * Configure state now that we are associated. 1722 * 1723 * XXX may need different/additional driver callbacks? 1724 */ 1725 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1726 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1727 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1728 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1729 } else { 1730 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1731 ic->ic_flags |= IEEE80211_F_USEBARKER; 1732 } 1733 ieee80211_set_shortslottime(ic, 1734 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1735 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1736 /* 1737 * Honor ERP protection. 1738 * 1739 * NB: ni_erp should zero for non-11g operation. 1740 */ 1741 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1742 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1743 ic->ic_flags |= IEEE80211_F_USEPROT; 1744 else 1745 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1746 IEEE80211_NOTE_MAC(vap, 1747 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1748 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1749 ISREASSOC(subtype) ? "re" : "", 1750 IEEE80211_NODE_AID(ni), 1751 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1752 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1753 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1754 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1755 ni->ni_flags & IEEE80211_NODE_HT ? 1756 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1757 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1758 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1759 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1760 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1761 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1762 ", fast-frames" : "", 1763 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1764 ", turbo" : "" 1765 ); 1766 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1767 break; 1768 } 1769 1770 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1771 uint16_t reason; 1772 1773 if (vap->iv_state == IEEE80211_S_SCAN) { 1774 vap->iv_stats.is_rx_mgtdiscard++; 1775 return; 1776 } 1777 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1778 /* NB: can happen when in promiscuous mode */ 1779 vap->iv_stats.is_rx_mgtdiscard++; 1780 break; 1781 } 1782 1783 /* 1784 * deauth frame format 1785 * [2] reason 1786 */ 1787 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1788 reason = le16toh(*(uint16_t *)frm); 1789 1790 vap->iv_stats.is_rx_deauth++; 1791 vap->iv_stats.is_rx_deauth_code = reason; 1792 IEEE80211_NODE_STAT(ni, rx_deauth); 1793 1794 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1795 "recv deauthenticate (reason %d)", reason); 1796 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1797 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1798 break; 1799 } 1800 1801 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1802 uint16_t reason; 1803 1804 if (vap->iv_state != IEEE80211_S_RUN && 1805 vap->iv_state != IEEE80211_S_ASSOC && 1806 vap->iv_state != IEEE80211_S_AUTH) { 1807 vap->iv_stats.is_rx_mgtdiscard++; 1808 return; 1809 } 1810 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1811 /* NB: can happen when in promiscuous mode */ 1812 vap->iv_stats.is_rx_mgtdiscard++; 1813 break; 1814 } 1815 1816 /* 1817 * disassoc frame format 1818 * [2] reason 1819 */ 1820 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1821 reason = le16toh(*(uint16_t *)frm); 1822 1823 vap->iv_stats.is_rx_disassoc++; 1824 vap->iv_stats.is_rx_disassoc_code = reason; 1825 IEEE80211_NODE_STAT(ni, rx_disassoc); 1826 1827 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1828 "recv disassociate (reason %d)", reason); 1829 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1830 break; 1831 } 1832 1833 case IEEE80211_FC0_SUBTYPE_ACTION: 1834 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1835 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1836 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1837 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1838 wh, NULL, "%s", "not for us"); 1839 vap->iv_stats.is_rx_mgtdiscard++; 1840 } else if (vap->iv_state != IEEE80211_S_RUN) { 1841 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1842 wh, NULL, "wrong state %s", 1843 ieee80211_state_name[vap->iv_state]); 1844 vap->iv_stats.is_rx_mgtdiscard++; 1845 } else { 1846 if (ieee80211_parse_action(ni, m0) == 0) 1847 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1848 } 1849 break; 1850 1851 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1852 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1853 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1854 case IEEE80211_FC0_SUBTYPE_ATIM: 1855 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1856 wh, NULL, "%s", "not handled"); 1857 vap->iv_stats.is_rx_mgtdiscard++; 1858 break; 1859 1860 default: 1861 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1862 wh, "mgt", "subtype 0x%x not handled", subtype); 1863 vap->iv_stats.is_rx_badsubtype++; 1864 break; 1865 } 1866 #undef ISREASSOC 1867 #undef ISPROBE 1868 } 1869 1870 static void 1871 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1872 { 1873 switch (subtype) { 1874 case IEEE80211_FC0_SUBTYPE_BAR: 1875 ieee80211_recv_bar(ni, m); 1876 break; 1877 } 1878 } 1879