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 #include <net80211/ieee80211_vht.h> 68 69 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 70 71 static void sta_vattach(struct ieee80211vap *); 72 static void sta_beacon_miss(struct ieee80211vap *); 73 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 74 static int sta_input(struct ieee80211_node *, struct mbuf *, 75 const struct ieee80211_rx_stats *, int, int); 76 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 77 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 78 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 79 80 void 81 ieee80211_sta_attach(struct ieee80211com *ic) 82 { 83 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 84 } 85 86 void 87 ieee80211_sta_detach(struct ieee80211com *ic) 88 { 89 } 90 91 static void 92 sta_vdetach(struct ieee80211vap *vap) 93 { 94 } 95 96 static void 97 sta_vattach(struct ieee80211vap *vap) 98 { 99 vap->iv_newstate = sta_newstate; 100 vap->iv_input = sta_input; 101 vap->iv_recv_mgmt = sta_recv_mgmt; 102 vap->iv_recv_ctl = sta_recv_ctl; 103 vap->iv_opdetach = sta_vdetach; 104 vap->iv_bmiss = sta_beacon_miss; 105 } 106 107 /* 108 * Handle a beacon miss event. The common code filters out 109 * spurious events that can happen when scanning and/or before 110 * reaching RUN state. 111 */ 112 static void 113 sta_beacon_miss(struct ieee80211vap *vap) 114 { 115 struct ieee80211com *ic = vap->iv_ic; 116 117 IEEE80211_LOCK_ASSERT(ic); 118 119 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 120 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 121 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 122 123 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 124 "beacon miss, mode %s state %s\n", 125 ieee80211_opmode_name[vap->iv_opmode], 126 ieee80211_state_name[vap->iv_state]); 127 128 if (vap->iv_state == IEEE80211_S_CSA) { 129 /* 130 * A Channel Switch is pending; assume we missed the 131 * beacon that would've completed the process and just 132 * force the switch. If we made a mistake we'll not 133 * find the AP on the new channel and fall back to a 134 * normal scan. 135 */ 136 ieee80211_csa_completeswitch(ic); 137 return; 138 } 139 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 140 /* 141 * Send a directed probe req before falling back to a 142 * scan; if we receive a response ic_bmiss_count will 143 * be reset. Some cards mistakenly report beacon miss 144 * so this avoids the expensive scan if the ap is 145 * still there. 146 */ 147 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 148 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 149 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 150 return; 151 } 152 153 callout_stop(&vap->iv_swbmiss); 154 vap->iv_bmiss_count = 0; 155 vap->iv_stats.is_beacon_miss++; 156 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 157 #ifdef IEEE80211_SUPPORT_SUPERG 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 static void 210 sta_swbmiss_start(struct ieee80211vap *vap) 211 { 212 213 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) { 214 /* 215 * Start s/w beacon miss timer for devices w/o 216 * hardware support. We fudge a bit here since 217 * we're doing this in software. 218 */ 219 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 220 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval); 221 vap->iv_swbmiss_count = 0; 222 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 223 ieee80211_swbmiss, vap); 224 } 225 } 226 227 /* 228 * IEEE80211_M_STA vap state machine handler. 229 * This routine handles the main states in the 802.11 protocol. 230 */ 231 static int 232 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 233 { 234 struct ieee80211com *ic = vap->iv_ic; 235 struct ieee80211_node *ni; 236 enum ieee80211_state ostate; 237 238 IEEE80211_LOCK_ASSERT(ic); 239 240 ostate = vap->iv_state; 241 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 242 __func__, ieee80211_state_name[ostate], 243 ieee80211_state_name[nstate], arg); 244 vap->iv_state = nstate; /* state transition */ 245 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 246 if (ostate != IEEE80211_S_SCAN) 247 ieee80211_cancel_scan(vap); /* background scan */ 248 ni = vap->iv_bss; /* NB: no reference held */ 249 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 250 callout_stop(&vap->iv_swbmiss); 251 switch (nstate) { 252 case IEEE80211_S_INIT: 253 switch (ostate) { 254 case IEEE80211_S_SLEEP: 255 /* XXX wakeup */ 256 /* XXX driver hook to wakeup the hardware? */ 257 case IEEE80211_S_RUN: 258 IEEE80211_SEND_MGMT(ni, 259 IEEE80211_FC0_SUBTYPE_DISASSOC, 260 IEEE80211_REASON_ASSOC_LEAVE); 261 ieee80211_sta_leave(ni); 262 break; 263 case IEEE80211_S_ASSOC: 264 IEEE80211_SEND_MGMT(ni, 265 IEEE80211_FC0_SUBTYPE_DEAUTH, 266 IEEE80211_REASON_AUTH_LEAVE); 267 break; 268 case IEEE80211_S_SCAN: 269 ieee80211_cancel_scan(vap); 270 break; 271 default: 272 break; 273 } 274 if (ostate != IEEE80211_S_INIT) { 275 /* NB: optimize INIT -> INIT case */ 276 ieee80211_reset_bss(vap); 277 } 278 if (vap->iv_auth->ia_detach != NULL) 279 vap->iv_auth->ia_detach(vap); 280 break; 281 case IEEE80211_S_SCAN: 282 switch (ostate) { 283 case IEEE80211_S_INIT: 284 /* 285 * Initiate a scan. We can come here as a result 286 * of an IEEE80211_IOC_SCAN_REQ too in which case 287 * the vap will be marked with IEEE80211_FEXT_SCANREQ 288 * and the scan request parameters will be present 289 * in iv_scanreq. Otherwise we do the default. 290 */ 291 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 292 ieee80211_check_scan(vap, 293 vap->iv_scanreq_flags, 294 vap->iv_scanreq_duration, 295 vap->iv_scanreq_mindwell, 296 vap->iv_scanreq_maxdwell, 297 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 298 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 299 } else 300 ieee80211_check_scan_current(vap); 301 break; 302 case IEEE80211_S_SCAN: 303 case IEEE80211_S_AUTH: 304 case IEEE80211_S_ASSOC: 305 /* 306 * These can happen either because of a timeout 307 * on an assoc/auth response or because of a 308 * change in state that requires a reset. For 309 * the former we're called with a non-zero arg 310 * that is the cause for the failure; pass this 311 * to the scan code so it can update state. 312 * Otherwise trigger a new scan unless we're in 313 * manual roaming mode in which case an application 314 * must issue an explicit scan request. 315 */ 316 if (arg != 0) 317 ieee80211_scan_assoc_fail(vap, 318 vap->iv_bss->ni_macaddr, arg); 319 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 320 ieee80211_check_scan_current(vap); 321 break; 322 case IEEE80211_S_SLEEP: /* beacon miss */ 323 /* 324 * XXX if in sleep we need to wakeup the hardware. 325 */ 326 /* FALLTHROUGH */ 327 case IEEE80211_S_RUN: /* beacon miss */ 328 /* 329 * Beacon miss. Notify user space and if not 330 * under control of a user application (roaming 331 * manual) kick off a scan to re-connect. 332 */ 333 334 ieee80211_sta_leave(ni); 335 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 336 ieee80211_check_scan_current(vap); 337 break; 338 default: 339 goto invalid; 340 } 341 break; 342 case IEEE80211_S_AUTH: 343 switch (ostate) { 344 case IEEE80211_S_INIT: 345 case IEEE80211_S_SCAN: 346 IEEE80211_SEND_MGMT(ni, 347 IEEE80211_FC0_SUBTYPE_AUTH, 1); 348 break; 349 case IEEE80211_S_AUTH: 350 case IEEE80211_S_ASSOC: 351 switch (arg & 0xff) { 352 case IEEE80211_FC0_SUBTYPE_AUTH: 353 /* ??? */ 354 IEEE80211_SEND_MGMT(ni, 355 IEEE80211_FC0_SUBTYPE_AUTH, 2); 356 break; 357 case IEEE80211_FC0_SUBTYPE_DEAUTH: 358 sta_authretry(vap, ni, arg>>8); 359 break; 360 } 361 break; 362 case IEEE80211_S_SLEEP: 363 case IEEE80211_S_RUN: 364 switch (arg & 0xff) { 365 case IEEE80211_FC0_SUBTYPE_AUTH: 366 IEEE80211_SEND_MGMT(ni, 367 IEEE80211_FC0_SUBTYPE_AUTH, 2); 368 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 369 break; 370 case IEEE80211_FC0_SUBTYPE_DEAUTH: 371 ieee80211_sta_leave(ni); 372 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 373 /* try to reauth */ 374 IEEE80211_SEND_MGMT(ni, 375 IEEE80211_FC0_SUBTYPE_AUTH, 1); 376 } 377 break; 378 } 379 break; 380 default: 381 goto invalid; 382 } 383 break; 384 case IEEE80211_S_ASSOC: 385 switch (ostate) { 386 case IEEE80211_S_AUTH: 387 case IEEE80211_S_ASSOC: 388 IEEE80211_SEND_MGMT(ni, 389 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 390 break; 391 case IEEE80211_S_SLEEP: /* cannot happen */ 392 case IEEE80211_S_RUN: 393 ieee80211_sta_leave(ni); 394 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 395 IEEE80211_SEND_MGMT(ni, arg ? 396 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 397 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 398 } 399 break; 400 default: 401 goto invalid; 402 } 403 break; 404 case IEEE80211_S_RUN: 405 if (vap->iv_flags & IEEE80211_F_WPA) { 406 /* XXX validate prerequisites */ 407 } 408 switch (ostate) { 409 case IEEE80211_S_RUN: 410 case IEEE80211_S_CSA: 411 break; 412 case IEEE80211_S_AUTH: /* when join is done in fw */ 413 case IEEE80211_S_ASSOC: 414 #ifdef IEEE80211_DEBUG 415 if (ieee80211_msg_debug(vap)) { 416 ieee80211_note(vap, "%s with %s ssid ", 417 (vap->iv_opmode == IEEE80211_M_STA ? 418 "associated" : "synchronized"), 419 ether_sprintf(ni->ni_bssid)); 420 ieee80211_print_essid(vap->iv_bss->ni_essid, 421 ni->ni_esslen); 422 /* XXX MCS/HT */ 423 printf(" channel %d start %uMb\n", 424 ieee80211_chan2ieee(ic, ic->ic_curchan), 425 IEEE80211_RATE2MBS(ni->ni_txrate)); 426 } 427 #endif 428 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 429 ieee80211_notify_node_join(ni, 430 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 431 break; 432 case IEEE80211_S_SLEEP: 433 /* Wake up from sleep */ 434 vap->iv_sta_ps(vap, 0); 435 break; 436 default: 437 goto invalid; 438 } 439 ieee80211_sync_curchan(ic); 440 if (ostate != IEEE80211_S_RUN) 441 sta_swbmiss_start(vap); 442 /* 443 * When 802.1x is not in use mark the port authorized 444 * at this point so traffic can flow. 445 */ 446 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 447 ieee80211_node_authorize(ni); 448 /* 449 * Fake association when joining an existing bss. 450 * 451 * Don't do this if we're doing SLEEP->RUN. 452 */ 453 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 454 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 455 break; 456 case IEEE80211_S_CSA: 457 if (ostate != IEEE80211_S_RUN) 458 goto invalid; 459 break; 460 case IEEE80211_S_SLEEP: 461 sta_swbmiss_start(vap); 462 vap->iv_sta_ps(vap, 1); 463 break; 464 default: 465 invalid: 466 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 467 "%s: unexpected state transition %s -> %s\n", __func__, 468 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 469 break; 470 } 471 return 0; 472 } 473 474 /* 475 * Return non-zero if the frame is an echo of a multicast 476 * frame sent by ourself. The dir is known to be DSTODS. 477 */ 478 static __inline int 479 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 480 { 481 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 482 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 483 const uint8_t *sa; 484 485 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 486 487 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 488 return 0; 489 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 490 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 491 #undef WH4 492 #undef QWH4 493 } 494 495 /* 496 * Return non-zero if the frame is an echo of a multicast 497 * frame sent by ourself. The dir is known to be FROMDS. 498 */ 499 static __inline int 500 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 501 { 502 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 503 504 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 505 return 0; 506 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 507 } 508 509 /* 510 * Decide if a received management frame should be 511 * printed when debugging is enabled. This filters some 512 * of the less interesting frames that come frequently 513 * (e.g. beacons). 514 */ 515 static __inline int 516 doprint(struct ieee80211vap *vap, int subtype) 517 { 518 switch (subtype) { 519 case IEEE80211_FC0_SUBTYPE_BEACON: 520 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 521 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 522 return 0; 523 } 524 return 1; 525 } 526 527 /* 528 * Process a received frame. The node associated with the sender 529 * should be supplied. If nothing was found in the node table then 530 * the caller is assumed to supply a reference to iv_bss instead. 531 * The RSSI and a timestamp are also supplied. The RSSI data is used 532 * during AP scanning to select a AP to associate with; it can have 533 * any units so long as values have consistent units and higher values 534 * mean ``better signal''. The receive timestamp is currently not used 535 * by the 802.11 layer. 536 */ 537 static int 538 sta_input(struct ieee80211_node *ni, struct mbuf *m, 539 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 540 { 541 struct ieee80211vap *vap = ni->ni_vap; 542 struct ieee80211com *ic = ni->ni_ic; 543 struct ifnet *ifp = vap->iv_ifp; 544 struct ieee80211_frame *wh; 545 struct ieee80211_key *key; 546 struct ether_header *eh; 547 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 548 uint8_t dir, type, subtype, qos; 549 uint8_t *bssid; 550 int is_hw_decrypted = 0; 551 int has_decrypted = 0; 552 553 /* 554 * Some devices do hardware decryption all the way through 555 * to pretending the frame wasn't encrypted in the first place. 556 * So, tag it appropriately so it isn't discarded inappropriately. 557 */ 558 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 559 is_hw_decrypted = 1; 560 561 if (m->m_flags & M_AMPDU_MPDU) { 562 /* 563 * Fastpath for A-MPDU reorder q resubmission. Frames 564 * w/ M_AMPDU_MPDU marked have already passed through 565 * here but were received out of order and been held on 566 * the reorder queue. When resubmitted they are marked 567 * with the M_AMPDU_MPDU flag and we can bypass most of 568 * the normal processing. 569 */ 570 wh = mtod(m, struct ieee80211_frame *); 571 type = IEEE80211_FC0_TYPE_DATA; 572 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 573 subtype = IEEE80211_FC0_SUBTYPE_QOS; 574 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 575 goto resubmit_ampdu; 576 } 577 578 KASSERT(ni != NULL, ("null node")); 579 ni->ni_inact = ni->ni_inact_reload; 580 581 type = -1; /* undefined */ 582 583 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 584 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 585 ni->ni_macaddr, NULL, 586 "too short (1): len %u", m->m_pkthdr.len); 587 vap->iv_stats.is_rx_tooshort++; 588 goto out; 589 } 590 /* 591 * Bit of a cheat here, we use a pointer for a 3-address 592 * frame format but don't reference fields past outside 593 * ieee80211_frame_min w/o first validating the data is 594 * present. 595 */ 596 wh = mtod(m, struct ieee80211_frame *); 597 598 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 599 IEEE80211_FC0_VERSION_0) { 600 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 601 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 602 wh->i_fc[0], wh->i_fc[1]); 603 vap->iv_stats.is_rx_badversion++; 604 goto err; 605 } 606 607 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 608 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 609 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 610 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 611 bssid = wh->i_addr2; 612 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 613 /* not interested in */ 614 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 615 bssid, NULL, "%s", "not to bss"); 616 vap->iv_stats.is_rx_wrongbss++; 617 goto out; 618 } 619 620 /* 621 * Some devices may be in a promiscuous mode 622 * where they receive frames for multiple station 623 * addresses. 624 * 625 * If we receive a data frame that isn't 626 * destined to our VAP MAC, drop it. 627 * 628 * XXX TODO: This is only enforced when not scanning; 629 * XXX it assumes a software-driven scan will put the NIC 630 * XXX into a "no data frames" mode before setting this 631 * XXX flag. Otherwise it may be possible that we'll still 632 * XXX process data frames whilst scanning. 633 */ 634 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 635 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 636 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 637 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 638 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 639 vap->iv_stats.is_rx_wrongbss++; 640 goto out; 641 } 642 643 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 644 ni->ni_noise = nf; 645 if ( IEEE80211_HAS_SEQ(type, subtype) && 646 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 647 uint8_t tid = ieee80211_gettid(wh); 648 if (IEEE80211_QOS_HAS_SEQ(wh) && 649 TID_TO_WME_AC(tid) >= WME_AC_VI) 650 ic->ic_wme.wme_hipri_traffic++; 651 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs)) 652 goto out; 653 } 654 } 655 656 switch (type) { 657 case IEEE80211_FC0_TYPE_DATA: 658 hdrspace = ieee80211_hdrspace(ic, wh); 659 if (m->m_len < hdrspace && 660 (m = m_pullup(m, hdrspace)) == NULL) { 661 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 662 ni->ni_macaddr, NULL, 663 "data too short: expecting %u", hdrspace); 664 vap->iv_stats.is_rx_tooshort++; 665 goto out; /* XXX */ 666 } 667 /* 668 * Handle A-MPDU re-ordering. If the frame is to be 669 * processed directly then ieee80211_ampdu_reorder 670 * will return 0; otherwise it has consumed the mbuf 671 * and we should do nothing more with it. 672 */ 673 if ((m->m_flags & M_AMPDU) && 674 (dir == IEEE80211_FC1_DIR_FROMDS || 675 dir == IEEE80211_FC1_DIR_DSTODS) && 676 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 677 m = NULL; 678 goto out; 679 } 680 resubmit_ampdu: 681 if (dir == IEEE80211_FC1_DIR_FROMDS) { 682 if ((ifp->if_flags & IFF_SIMPLEX) && 683 isfromds_mcastecho(vap, wh)) { 684 /* 685 * In IEEE802.11 network, multicast 686 * packets sent from "me" are broadcast 687 * from the AP; silently discard for 688 * SIMPLEX interface. 689 */ 690 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 691 wh, "data", "%s", "multicast echo"); 692 vap->iv_stats.is_rx_mcastecho++; 693 goto out; 694 } 695 if ((vap->iv_flags & IEEE80211_F_DWDS) && 696 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 697 /* 698 * DWDS sta's must drop 3-address mcast frames 699 * as they will be sent separately as a 4-addr 700 * frame. Accepting the 3-addr frame will 701 * confuse the bridge into thinking the sending 702 * sta is located at the end of WDS link. 703 */ 704 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 705 "3-address data", "%s", "DWDS enabled"); 706 vap->iv_stats.is_rx_mcastecho++; 707 goto out; 708 } 709 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 710 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 711 IEEE80211_DISCARD(vap, 712 IEEE80211_MSG_INPUT, wh, "4-address data", 713 "%s", "DWDS not enabled"); 714 vap->iv_stats.is_rx_wrongdir++; 715 goto out; 716 } 717 if ((ifp->if_flags & IFF_SIMPLEX) && 718 isdstods_mcastecho(vap, wh)) { 719 /* 720 * In IEEE802.11 network, multicast 721 * packets sent from "me" are broadcast 722 * from the AP; silently discard for 723 * SIMPLEX interface. 724 */ 725 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 726 "4-address data", "%s", "multicast echo"); 727 vap->iv_stats.is_rx_mcastecho++; 728 goto out; 729 } 730 } else { 731 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 732 "data", "incorrect dir 0x%x", dir); 733 vap->iv_stats.is_rx_wrongdir++; 734 goto out; 735 } 736 737 /* 738 * Handle privacy requirements for hardware decryption 739 * devices. 740 * 741 * For those devices, a handful of things happen. 742 * 743 * + If IV has been stripped, then we can't run 744 * ieee80211_crypto_decap() - none of the key 745 * + If MIC has been stripped, we can't validate 746 * MIC here. 747 * + If MIC fails, then we need to communicate a 748 * MIC failure up to the stack - but we don't know 749 * which key was used. 750 */ 751 752 /* 753 * Handle privacy requirements. Note that we 754 * must not be preempted from here until after 755 * we (potentially) call ieee80211_crypto_demic; 756 * otherwise we may violate assumptions in the 757 * crypto cipher modules used to do delayed update 758 * of replay sequence numbers. 759 */ 760 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 761 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 762 /* 763 * Discard encrypted frames when privacy is off. 764 */ 765 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 766 wh, "WEP", "%s", "PRIVACY off"); 767 vap->iv_stats.is_rx_noprivacy++; 768 IEEE80211_NODE_STAT(ni, rx_noprivacy); 769 goto out; 770 } 771 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 772 /* NB: stats+msgs handled in crypto_decap */ 773 IEEE80211_NODE_STAT(ni, rx_wepfail); 774 goto out; 775 } 776 wh = mtod(m, struct ieee80211_frame *); 777 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 778 has_decrypted = 1; 779 } else { 780 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 781 key = NULL; 782 } 783 784 /* 785 * Save QoS bits for use below--before we strip the header. 786 */ 787 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 788 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 789 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 790 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 791 } else 792 qos = 0; 793 794 /* 795 * Next up, any fragmentation. 796 */ 797 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 798 m = ieee80211_defrag(ni, m, hdrspace); 799 if (m == NULL) { 800 /* Fragment dropped or frame not complete yet */ 801 goto out; 802 } 803 } 804 wh = NULL; /* no longer valid, catch any uses */ 805 806 /* 807 * Next strip any MSDU crypto bits. 808 * 809 * Note: we can't do MIC stripping/verification if the 810 * upper layer has stripped it. We have to check MIC 811 * ourselves. So, key may be NULL, but we have to check 812 * the RX status. 813 */ 814 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 815 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 816 ni->ni_macaddr, "data", "%s", "demic error"); 817 vap->iv_stats.is_rx_demicfail++; 818 IEEE80211_NODE_STAT(ni, rx_demicfail); 819 goto out; 820 } 821 822 /* copy to listener after decrypt */ 823 if (ieee80211_radiotap_active_vap(vap)) 824 ieee80211_radiotap_rx(vap, m); 825 need_tap = 0; 826 827 /* 828 * Finally, strip the 802.11 header. 829 */ 830 m = ieee80211_decap(vap, m, hdrspace); 831 if (m == NULL) { 832 /* XXX mask bit to check for both */ 833 /* don't count Null data frames as errors */ 834 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 835 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 836 goto out; 837 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 838 ni->ni_macaddr, "data", "%s", "decap error"); 839 vap->iv_stats.is_rx_decap++; 840 IEEE80211_NODE_STAT(ni, rx_decap); 841 goto err; 842 } 843 eh = mtod(m, struct ether_header *); 844 if (!ieee80211_node_is_authorized(ni)) { 845 /* 846 * Deny any non-PAE frames received prior to 847 * authorization. For open/shared-key 848 * authentication the port is mark authorized 849 * after authentication completes. For 802.1x 850 * the port is not marked authorized by the 851 * authenticator until the handshake has completed. 852 */ 853 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 854 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 855 eh->ether_shost, "data", 856 "unauthorized port: ether type 0x%x len %u", 857 eh->ether_type, m->m_pkthdr.len); 858 vap->iv_stats.is_rx_unauth++; 859 IEEE80211_NODE_STAT(ni, rx_unauth); 860 goto err; 861 } 862 } else { 863 /* 864 * When denying unencrypted frames, discard 865 * any non-PAE frames received without encryption. 866 */ 867 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 868 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 869 (is_hw_decrypted == 0) && 870 eh->ether_type != htons(ETHERTYPE_PAE)) { 871 /* 872 * Drop unencrypted frames. 873 */ 874 vap->iv_stats.is_rx_unencrypted++; 875 IEEE80211_NODE_STAT(ni, rx_unencrypted); 876 goto out; 877 } 878 } 879 /* XXX require HT? */ 880 if (qos & IEEE80211_QOS_AMSDU) { 881 m = ieee80211_decap_amsdu(ni, m); 882 if (m == NULL) 883 return IEEE80211_FC0_TYPE_DATA; 884 } else { 885 #ifdef IEEE80211_SUPPORT_SUPERG 886 m = ieee80211_decap_fastframe(vap, ni, m); 887 if (m == NULL) 888 return IEEE80211_FC0_TYPE_DATA; 889 #endif 890 } 891 ieee80211_deliver_data(vap, ni, m); 892 return IEEE80211_FC0_TYPE_DATA; 893 894 case IEEE80211_FC0_TYPE_MGT: 895 vap->iv_stats.is_rx_mgmt++; 896 IEEE80211_NODE_STAT(ni, rx_mgmt); 897 if (dir != IEEE80211_FC1_DIR_NODS) { 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 899 wh, "data", "incorrect dir 0x%x", dir); 900 vap->iv_stats.is_rx_wrongdir++; 901 goto err; 902 } 903 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 904 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 905 ni->ni_macaddr, "mgt", "too short: len %u", 906 m->m_pkthdr.len); 907 vap->iv_stats.is_rx_tooshort++; 908 goto out; 909 } 910 #ifdef IEEE80211_DEBUG 911 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 912 ieee80211_msg_dumppkts(vap)) { 913 if_printf(ifp, "received %s from %s rssi %d\n", 914 ieee80211_mgt_subtype_name(subtype), 915 ether_sprintf(wh->i_addr2), rssi); 916 } 917 #endif 918 919 /* 920 * Note: See above for hardware offload privacy requirements. 921 * It also applies here. 922 */ 923 924 /* 925 * Again, having encrypted flag set check would be good, but 926 * then we have to also handle crypto_decap() like above. 927 */ 928 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 929 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 930 /* 931 * Only shared key auth frames with a challenge 932 * should be encrypted, discard all others. 933 */ 934 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 935 wh, ieee80211_mgt_subtype_name(subtype), 936 "%s", "WEP set but not permitted"); 937 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 938 goto out; 939 } 940 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 941 /* 942 * Discard encrypted frames when privacy is off. 943 */ 944 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 945 wh, "mgt", "%s", "WEP set but PRIVACY off"); 946 vap->iv_stats.is_rx_noprivacy++; 947 goto out; 948 } 949 hdrspace = ieee80211_hdrspace(ic, wh); 950 951 /* 952 * Again, if IV/MIC was stripped, then this whole 953 * setup will fail. That's going to need some poking. 954 */ 955 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 956 /* NB: stats+msgs handled in crypto_decap */ 957 goto out; 958 } 959 has_decrypted = 1; 960 wh = mtod(m, struct ieee80211_frame *); 961 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 962 } 963 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 964 goto out; 965 966 case IEEE80211_FC0_TYPE_CTL: 967 vap->iv_stats.is_rx_ctl++; 968 IEEE80211_NODE_STAT(ni, rx_ctrl); 969 vap->iv_recv_ctl(ni, m, subtype); 970 goto out; 971 972 default: 973 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 974 wh, NULL, "bad frame type 0x%x", type); 975 /* should not come here */ 976 break; 977 } 978 err: 979 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 980 out: 981 if (m != NULL) { 982 if (need_tap && ieee80211_radiotap_active_vap(vap)) 983 ieee80211_radiotap_rx(vap, m); 984 m_freem(m); 985 } 986 return type; 987 } 988 989 static void 990 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 991 int rssi, int nf, uint16_t seq, uint16_t status) 992 { 993 struct ieee80211vap *vap = ni->ni_vap; 994 995 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 996 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 997 ni->ni_macaddr, "open auth", 998 "bad sta auth mode %u", ni->ni_authmode); 999 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 1000 return; 1001 } 1002 if (vap->iv_state != IEEE80211_S_AUTH || 1003 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1004 vap->iv_stats.is_rx_bad_auth++; 1005 return; 1006 } 1007 if (status != 0) { 1008 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1009 ni, "open auth failed (reason %d)", status); 1010 vap->iv_stats.is_rx_auth_fail++; 1011 vap->iv_stats.is_rx_authfail_code = status; 1012 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1013 IEEE80211_SCAN_FAIL_STATUS); 1014 } else 1015 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1016 } 1017 1018 static void 1019 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1020 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1021 uint16_t seq, uint16_t status) 1022 { 1023 struct ieee80211vap *vap = ni->ni_vap; 1024 uint8_t *challenge; 1025 1026 /* 1027 * NB: this can happen as we allow pre-shared key 1028 * authentication to be enabled w/o wep being turned 1029 * on so that configuration of these can be done 1030 * in any order. It may be better to enforce the 1031 * ordering in which case this check would just be 1032 * for sanity/consistency. 1033 */ 1034 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1035 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1036 ni->ni_macaddr, "shared key auth", 1037 "%s", " PRIVACY is disabled"); 1038 goto bad; 1039 } 1040 /* 1041 * Pre-shared key authentication is evil; accept 1042 * it only if explicitly configured (it is supported 1043 * mainly for compatibility with clients like OS X). 1044 */ 1045 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1046 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1047 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1048 ni->ni_macaddr, "shared key auth", 1049 "bad sta auth mode %u", ni->ni_authmode); 1050 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1051 goto bad; 1052 } 1053 1054 challenge = NULL; 1055 if (frm + 1 < efrm) { 1056 if ((frm[1] + 2) > (efrm - frm)) { 1057 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1058 ni->ni_macaddr, "shared key auth", 1059 "ie %d/%d too long", 1060 frm[0], (frm[1] + 2) - (efrm - frm)); 1061 vap->iv_stats.is_rx_bad_auth++; 1062 goto bad; 1063 } 1064 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1065 challenge = frm; 1066 frm += frm[1] + 2; 1067 } 1068 switch (seq) { 1069 case IEEE80211_AUTH_SHARED_CHALLENGE: 1070 case IEEE80211_AUTH_SHARED_RESPONSE: 1071 if (challenge == NULL) { 1072 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1073 ni->ni_macaddr, "shared key auth", 1074 "%s", "no challenge"); 1075 vap->iv_stats.is_rx_bad_auth++; 1076 goto bad; 1077 } 1078 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1079 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1080 ni->ni_macaddr, "shared key auth", 1081 "bad challenge len %d", challenge[1]); 1082 vap->iv_stats.is_rx_bad_auth++; 1083 goto bad; 1084 } 1085 default: 1086 break; 1087 } 1088 if (vap->iv_state != IEEE80211_S_AUTH) 1089 return; 1090 switch (seq) { 1091 case IEEE80211_AUTH_SHARED_PASS: 1092 if (ni->ni_challenge != NULL) { 1093 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1094 ni->ni_challenge = NULL; 1095 } 1096 if (status != 0) { 1097 IEEE80211_NOTE_FRAME(vap, 1098 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1099 "shared key auth failed (reason %d)", status); 1100 vap->iv_stats.is_rx_auth_fail++; 1101 vap->iv_stats.is_rx_authfail_code = status; 1102 return; 1103 } 1104 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1105 break; 1106 case IEEE80211_AUTH_SHARED_CHALLENGE: 1107 if (!ieee80211_alloc_challenge(ni)) 1108 return; 1109 /* XXX could optimize by passing recvd challenge */ 1110 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1111 IEEE80211_SEND_MGMT(ni, 1112 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1113 break; 1114 default: 1115 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1116 wh, "shared key auth", "bad seq %d", seq); 1117 vap->iv_stats.is_rx_bad_auth++; 1118 return; 1119 } 1120 return; 1121 bad: 1122 /* 1123 * Kick the state machine. This short-circuits 1124 * using the mgt frame timeout to trigger the 1125 * state transition. 1126 */ 1127 if (vap->iv_state == IEEE80211_S_AUTH) 1128 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1129 IEEE80211_SCAN_FAIL_STATUS); 1130 } 1131 1132 int 1133 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1134 const struct ieee80211_frame *wh) 1135 { 1136 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1137 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1138 u_int len = frm[1], qosinfo; 1139 int i; 1140 1141 if (len < sizeof(struct ieee80211_wme_param)-2) { 1142 IEEE80211_DISCARD_IE(vap, 1143 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1144 wh, "WME", "too short, len %u", len); 1145 return -1; 1146 } 1147 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1148 qosinfo &= WME_QOSINFO_COUNT; 1149 /* XXX do proper check for wraparound */ 1150 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1151 return 0; 1152 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1153 for (i = 0; i < WME_NUM_AC; i++) { 1154 struct wmeParams *wmep = 1155 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1156 /* NB: ACI not used */ 1157 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1158 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1159 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1160 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1161 wmep->wmep_txopLimit = le16dec(frm+2); 1162 frm += 4; 1163 } 1164 wme->wme_wmeChanParams.cap_info = qosinfo; 1165 return 1; 1166 #undef MS 1167 } 1168 1169 /* 1170 * Process 11h Channel Switch Announcement (CSA) ie. If this 1171 * is the first CSA then initiate the switch. Otherwise we 1172 * track state and trigger completion and/or cancel of the switch. 1173 * XXX should be public for IBSS use 1174 */ 1175 static void 1176 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1177 const struct ieee80211_frame *wh) 1178 { 1179 struct ieee80211com *ic = vap->iv_ic; 1180 const struct ieee80211_csa_ie *csa = 1181 (const struct ieee80211_csa_ie *) frm; 1182 1183 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1184 ("state %s", ieee80211_state_name[vap->iv_state])); 1185 1186 if (csa->csa_mode > 1) { 1187 IEEE80211_DISCARD_IE(vap, 1188 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1189 wh, "CSA", "invalid mode %u", csa->csa_mode); 1190 return; 1191 } 1192 IEEE80211_LOCK(ic); 1193 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1194 /* 1195 * Convert the channel number to a channel reference. We 1196 * try first to preserve turbo attribute of the current 1197 * channel then fallback. Note this will not work if the 1198 * CSA specifies a channel that requires a band switch (e.g. 1199 * 11a => 11g). This is intentional as 11h is defined only 1200 * for 5GHz/11a and because the switch does not involve a 1201 * reassociation, protocol state (capabilities, negotated 1202 * rates, etc) may/will be wrong. 1203 */ 1204 struct ieee80211_channel *c = 1205 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1206 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1207 if (c == NULL) { 1208 c = ieee80211_find_channel_byieee(ic, 1209 csa->csa_newchan, 1210 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1211 if (c == NULL) { 1212 IEEE80211_DISCARD_IE(vap, 1213 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1214 wh, "CSA", "invalid channel %u", 1215 csa->csa_newchan); 1216 goto done; 1217 } 1218 } 1219 #if IEEE80211_CSA_COUNT_MIN > 0 1220 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1221 /* 1222 * Require at least IEEE80211_CSA_COUNT_MIN count to 1223 * reduce the risk of being redirected by a fabricated 1224 * CSA. If a valid CSA is dropped we'll still get a 1225 * beacon miss when the AP leaves the channel so we'll 1226 * eventually follow to the new channel. 1227 * 1228 * NOTE: this violates the 11h spec that states that 1229 * count may be any value and if 0 then a switch 1230 * should happen asap. 1231 */ 1232 IEEE80211_DISCARD_IE(vap, 1233 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1234 wh, "CSA", "count %u too small, must be >= %u", 1235 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1236 goto done; 1237 } 1238 #endif 1239 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1240 } else { 1241 /* 1242 * Validate this ie against the initial CSA. We require 1243 * mode and channel not change and the count must be 1244 * monotonically decreasing. This may be pointless and 1245 * canceling the switch as a result may be too paranoid but 1246 * in the worst case if we drop out of CSA because of this 1247 * and the AP does move then we'll just end up taking a 1248 * beacon miss and scan to find the AP. 1249 * 1250 * XXX may want <= on count as we also process ProbeResp 1251 * frames and those may come in w/ the same count as the 1252 * previous beacon; but doing so leaves us open to a stuck 1253 * count until we add a dead-man timer 1254 */ 1255 if (!(csa->csa_count < ic->ic_csa_count && 1256 csa->csa_mode == ic->ic_csa_mode && 1257 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1258 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1259 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1260 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1261 ic->ic_csa_newchan, ic->ic_csa_count, 1262 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1263 ieee80211_csa_cancelswitch(ic); 1264 } else { 1265 if (csa->csa_count <= 1) 1266 ieee80211_csa_completeswitch(ic); 1267 else 1268 ic->ic_csa_count = csa->csa_count; 1269 } 1270 } 1271 done: 1272 IEEE80211_UNLOCK(ic); 1273 } 1274 1275 /* 1276 * Return non-zero if a background scan may be continued: 1277 * o bg scan is active 1278 * o no channel switch is pending 1279 * o there has not been any traffic recently 1280 * o no full-offload scan support (no need for explicitly continuing scan then) 1281 * 1282 * Note we do not check if there is an administrative enable; 1283 * this is only done to start the scan. We assume that any 1284 * change in state will be accompanied by a request to cancel 1285 * active scans which will otherwise cause this test to fail. 1286 */ 1287 static __inline int 1288 contbgscan(struct ieee80211vap *vap) 1289 { 1290 struct ieee80211com *ic = vap->iv_ic; 1291 1292 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1293 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1294 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) && 1295 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1296 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1297 } 1298 1299 /* 1300 * Return non-zero if a backgrond scan may be started: 1301 * o bg scanning is administratively enabled 1302 * o no channel switch is pending 1303 * o we are not boosted on a dynamic turbo channel 1304 * o there has not been a scan recently 1305 * o there has not been any traffic recently (don't check if full-offload scan) 1306 */ 1307 static __inline int 1308 startbgscan(struct ieee80211vap *vap) 1309 { 1310 struct ieee80211com *ic = vap->iv_ic; 1311 1312 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1313 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1314 #ifdef IEEE80211_SUPPORT_SUPERG 1315 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1316 #endif 1317 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1318 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) || 1319 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))); 1320 } 1321 1322 #ifdef notyet 1323 /* 1324 * Compare two quiet IEs and return if they are equivalent. 1325 * 1326 * The tbttcount isnt checked - that's not part of the configuration. 1327 */ 1328 static int 1329 compare_quiet_ie(const struct ieee80211_quiet_ie *q1, 1330 const struct ieee80211_quiet_ie *q2) 1331 { 1332 1333 if (q1->period != q2->period) 1334 return (0); 1335 if (le16dec(&q1->duration) != le16dec(&q2->duration)) 1336 return (0); 1337 if (le16dec(&q1->offset) != le16dec(&q2->offset)) 1338 return (0); 1339 return (1); 1340 } 1341 #endif 1342 1343 static void 1344 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1345 const struct ieee80211_rx_stats *rxs, 1346 int rssi, int nf) 1347 { 1348 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1349 struct ieee80211vap *vap = ni->ni_vap; 1350 struct ieee80211com *ic = ni->ni_ic; 1351 struct ieee80211_channel *rxchan = ic->ic_curchan; 1352 struct ieee80211_frame *wh; 1353 uint8_t *frm, *efrm; 1354 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1355 uint8_t *vhtcap, *vhtopmode; 1356 uint8_t rate; 1357 int ht_state_change = 0, do_ht = 0; 1358 1359 wh = mtod(m0, struct ieee80211_frame *); 1360 frm = (uint8_t *)&wh[1]; 1361 efrm = mtod(m0, uint8_t *) + m0->m_len; 1362 switch (subtype) { 1363 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1364 case IEEE80211_FC0_SUBTYPE_BEACON: { 1365 struct ieee80211_scanparams scan; 1366 struct ieee80211_channel *c; 1367 /* 1368 * We process beacon/probe response frames: 1369 * o when scanning, or 1370 * o station mode when associated (to collect state 1371 * updates such as 802.11g slot time) 1372 * Frames otherwise received are discarded. 1373 */ 1374 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1375 vap->iv_stats.is_rx_mgtdiscard++; 1376 return; 1377 } 1378 1379 /* Override RX channel as appropriate */ 1380 if (rxs != NULL) { 1381 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1382 if (c != NULL) 1383 rxchan = c; 1384 } 1385 1386 /* XXX probe response in sta mode when !scanning? */ 1387 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1388 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1389 vap->iv_stats.is_beacon_bad++; 1390 return; 1391 } 1392 1393 /* 1394 * Count frame now that we know it's to be processed. 1395 */ 1396 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1397 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1398 IEEE80211_NODE_STAT(ni, rx_beacons); 1399 } else 1400 IEEE80211_NODE_STAT(ni, rx_proberesp); 1401 /* 1402 * When operating in station mode, check for state updates. 1403 * Be careful to ignore beacons received while doing a 1404 * background scan. We consider only 11g/WMM stuff right now. 1405 */ 1406 if (ni->ni_associd != 0 && 1407 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1408 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1409 /* record tsf of last beacon */ 1410 memcpy(ni->ni_tstamp.data, scan.tstamp, 1411 sizeof(ni->ni_tstamp)); 1412 /* count beacon frame for s/w bmiss handling */ 1413 vap->iv_swbmiss_count++; 1414 vap->iv_bmiss_count = 0; 1415 if (ni->ni_erp != scan.erp) { 1416 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1417 wh->i_addr2, 1418 "erp change: was 0x%x, now 0x%x", 1419 ni->ni_erp, scan.erp); 1420 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1421 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1422 ic->ic_flags |= IEEE80211_F_USEPROT; 1423 else 1424 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1425 ni->ni_erp = scan.erp; 1426 /* XXX statistic */ 1427 /* XXX driver notification */ 1428 } 1429 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1430 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1431 wh->i_addr2, 1432 "capabilities change: was 0x%x, now 0x%x", 1433 ni->ni_capinfo, scan.capinfo); 1434 /* 1435 * NB: we assume short preamble doesn't 1436 * change dynamically 1437 */ 1438 ieee80211_set_shortslottime(ic, 1439 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1440 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1441 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1442 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1443 /* XXX statistic */ 1444 } 1445 if (scan.wme != NULL && 1446 (ni->ni_flags & IEEE80211_NODE_QOS) && 1447 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1448 ieee80211_wme_updateparams(vap); 1449 #ifdef IEEE80211_SUPPORT_SUPERG 1450 if (scan.ath != NULL) 1451 ieee80211_parse_athparams(ni, scan.ath, wh); 1452 #endif 1453 if (scan.htcap != NULL && scan.htinfo != NULL && 1454 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1455 /* XXX state changes? */ 1456 ieee80211_ht_updateparams(ni, 1457 scan.htcap, scan.htinfo); 1458 do_ht = 1; 1459 } 1460 if (scan.vhtcap != NULL && scan.vhtopmode != NULL && 1461 (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) { 1462 /* XXX state changes? */ 1463 ieee80211_vht_updateparams(ni, 1464 scan.vhtcap, scan.vhtopmode); 1465 do_ht = 1; 1466 } 1467 if (do_ht) { 1468 if (ieee80211_ht_updateparams_final(ni, 1469 scan.htcap, scan.htinfo)) 1470 ht_state_change = 1; 1471 } 1472 1473 /* 1474 * If we have a quiet time IE then report it up to 1475 * the driver. 1476 * 1477 * Otherwise, inform the driver that the quiet time 1478 * IE has disappeared - only do that once rather than 1479 * spamming it each time. 1480 */ 1481 if (scan.quiet) { 1482 ic->ic_set_quiet(ni, scan.quiet); 1483 ni->ni_quiet_ie_set = 1; 1484 memcpy(&ni->ni_quiet_ie, scan.quiet, 1485 sizeof(struct ieee80211_quiet_ie)); 1486 } else { 1487 if (ni->ni_quiet_ie_set == 1) 1488 ic->ic_set_quiet(ni, NULL); 1489 ni->ni_quiet_ie_set = 0; 1490 bzero(&ni->ni_quiet_ie, 1491 sizeof(struct ieee80211_quiet_ie)); 1492 } 1493 1494 if (scan.tim != NULL) { 1495 struct ieee80211_tim_ie *tim = 1496 (struct ieee80211_tim_ie *) scan.tim; 1497 /* 1498 * XXX Check/debug this code; see if it's about 1499 * the right time to force the VAP awake if we 1500 * receive a frame destined for us? 1501 */ 1502 int aid = IEEE80211_AID(ni->ni_associd); 1503 int ix = aid / NBBY; 1504 int min = tim->tim_bitctl &~ 1; 1505 int max = tim->tim_len + min - 4; 1506 int tim_ucast = 0, tim_mcast = 0; 1507 1508 /* 1509 * Only do this for unicast traffic in the TIM 1510 * The multicast traffic notification for 1511 * the scan notification stuff should occur 1512 * differently. 1513 */ 1514 if (min <= ix && ix <= max && 1515 isset(tim->tim_bitmap - min, aid)) { 1516 tim_ucast = 1; 1517 } 1518 1519 /* 1520 * Do a separate notification 1521 * for the multicast bit being set. 1522 */ 1523 if (tim->tim_bitctl & 1) { 1524 tim_mcast = 1; 1525 } 1526 1527 /* 1528 * If the TIM indicates there's traffic for 1529 * us then get us out of STA mode powersave. 1530 */ 1531 if (tim_ucast == 1) { 1532 1533 /* 1534 * Wake us out of SLEEP state if we're 1535 * in it; and if we're doing bgscan 1536 * then wake us out of STA powersave. 1537 */ 1538 ieee80211_sta_tim_notify(vap, 1); 1539 1540 /* 1541 * This is preventing us from 1542 * continuing a bgscan; because it 1543 * tricks the contbgscan() 1544 * routine to think there's always 1545 * traffic for us. 1546 * 1547 * I think we need both an RX and 1548 * TX ic_lastdata field. 1549 */ 1550 ic->ic_lastdata = ticks; 1551 } 1552 1553 ni->ni_dtim_count = tim->tim_count; 1554 ni->ni_dtim_period = tim->tim_period; 1555 } 1556 if (scan.csa != NULL && 1557 (vap->iv_flags & IEEE80211_F_DOTH)) 1558 ieee80211_parse_csaparams(vap, scan.csa, wh); 1559 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1560 /* 1561 * No CSA ie or 11h disabled, but a channel 1562 * switch is pending; drop out so we aren't 1563 * stuck in CSA state. If the AP really is 1564 * moving we'll get a beacon miss and scan. 1565 */ 1566 IEEE80211_LOCK(ic); 1567 ieee80211_csa_cancelswitch(ic); 1568 IEEE80211_UNLOCK(ic); 1569 } 1570 /* 1571 * If scanning, pass the info to the scan module. 1572 * Otherwise, check if it's the right time to do 1573 * a background scan. Background scanning must 1574 * be enabled and we must not be operating in the 1575 * turbo phase of dynamic turbo mode. Then, 1576 * it's been a while since the last background 1577 * scan and if no data frames have come through 1578 * recently, kick off a scan. Note that this 1579 * is the mechanism by which a background scan 1580 * is started _and_ continued each time we 1581 * return on-channel to receive a beacon from 1582 * our ap. 1583 */ 1584 if (ic->ic_flags & IEEE80211_F_SCAN) { 1585 ieee80211_add_scan(vap, rxchan, 1586 &scan, wh, subtype, rssi, nf); 1587 } else if (contbgscan(vap)) { 1588 ieee80211_bg_scan(vap, 0); 1589 } else if (startbgscan(vap)) { 1590 vap->iv_stats.is_scan_bg++; 1591 #if 0 1592 /* wakeup if we are sleeing */ 1593 ieee80211_set_pwrsave(vap, 0); 1594 #endif 1595 ieee80211_bg_scan(vap, 0); 1596 } 1597 1598 /* 1599 * Put the station to sleep if we haven't seen 1600 * traffic in a while. 1601 */ 1602 IEEE80211_LOCK(ic); 1603 ieee80211_sta_ps_timer_check(vap); 1604 IEEE80211_UNLOCK(ic); 1605 1606 /* 1607 * If we've had a channel width change (eg HT20<->HT40) 1608 * then schedule a delayed driver notification. 1609 */ 1610 if (ht_state_change) 1611 ieee80211_update_chw(ic); 1612 return; 1613 } 1614 /* 1615 * If scanning, just pass information to the scan module. 1616 */ 1617 if (ic->ic_flags & IEEE80211_F_SCAN) { 1618 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1619 /* 1620 * Actively scanning a channel marked passive; 1621 * send a probe request now that we know there 1622 * is 802.11 traffic present. 1623 * 1624 * XXX check if the beacon we recv'd gives 1625 * us what we need and suppress the probe req 1626 */ 1627 ieee80211_probe_curchan(vap, 1); 1628 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1629 } 1630 ieee80211_add_scan(vap, rxchan, &scan, wh, 1631 subtype, rssi, nf); 1632 return; 1633 } 1634 break; 1635 } 1636 1637 case IEEE80211_FC0_SUBTYPE_AUTH: { 1638 uint16_t algo, seq, status; 1639 /* 1640 * auth frame format 1641 * [2] algorithm 1642 * [2] sequence 1643 * [2] status 1644 * [tlv*] challenge 1645 */ 1646 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1647 algo = le16toh(*(uint16_t *)frm); 1648 seq = le16toh(*(uint16_t *)(frm + 2)); 1649 status = le16toh(*(uint16_t *)(frm + 4)); 1650 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1651 "recv auth frame with algorithm %d seq %d", algo, seq); 1652 1653 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1654 IEEE80211_DISCARD(vap, 1655 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1656 wh, "auth", "%s", "TKIP countermeasures enabled"); 1657 vap->iv_stats.is_rx_auth_countermeasures++; 1658 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1659 ieee80211_send_error(ni, wh->i_addr2, 1660 IEEE80211_FC0_SUBTYPE_AUTH, 1661 IEEE80211_REASON_MIC_FAILURE); 1662 } 1663 return; 1664 } 1665 if (algo == IEEE80211_AUTH_ALG_SHARED) 1666 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1667 seq, status); 1668 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1669 sta_auth_open(ni, wh, rssi, nf, seq, status); 1670 else { 1671 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1672 wh, "auth", "unsupported alg %d", algo); 1673 vap->iv_stats.is_rx_auth_unsupported++; 1674 return; 1675 } 1676 break; 1677 } 1678 1679 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1680 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1681 uint16_t capinfo, associd; 1682 uint16_t status; 1683 1684 if (vap->iv_state != IEEE80211_S_ASSOC) { 1685 vap->iv_stats.is_rx_mgtdiscard++; 1686 return; 1687 } 1688 1689 /* 1690 * asresp frame format 1691 * [2] capability information 1692 * [2] status 1693 * [2] association ID 1694 * [tlv] supported rates 1695 * [tlv] extended supported rates 1696 * [tlv] WME 1697 * [tlv] HT capabilities 1698 * [tlv] HT info 1699 */ 1700 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1701 ni = vap->iv_bss; 1702 capinfo = le16toh(*(uint16_t *)frm); 1703 frm += 2; 1704 status = le16toh(*(uint16_t *)frm); 1705 frm += 2; 1706 if (status != 0) { 1707 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1708 wh->i_addr2, "%sassoc failed (reason %d)", 1709 ISREASSOC(subtype) ? "re" : "", status); 1710 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1711 return; 1712 } 1713 associd = le16toh(*(uint16_t *)frm); 1714 frm += 2; 1715 1716 rates = xrates = wme = htcap = htinfo = NULL; 1717 vhtcap = vhtopmode = NULL; 1718 while (efrm - frm > 1) { 1719 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1720 switch (*frm) { 1721 case IEEE80211_ELEMID_RATES: 1722 rates = frm; 1723 break; 1724 case IEEE80211_ELEMID_XRATES: 1725 xrates = frm; 1726 break; 1727 case IEEE80211_ELEMID_HTCAP: 1728 htcap = frm; 1729 break; 1730 case IEEE80211_ELEMID_HTINFO: 1731 htinfo = frm; 1732 break; 1733 case IEEE80211_ELEMID_VENDOR: 1734 if (iswmeoui(frm)) 1735 wme = frm; 1736 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1737 /* 1738 * Accept pre-draft HT ie's if the 1739 * standard ones have not been seen. 1740 */ 1741 if (ishtcapoui(frm)) { 1742 if (htcap == NULL) 1743 htcap = frm; 1744 } else if (ishtinfooui(frm)) { 1745 if (htinfo == NULL) 1746 htinfo = frm; 1747 } 1748 } 1749 /* XXX Atheros OUI support */ 1750 break; 1751 case IEEE80211_ELEMID_VHT_CAP: 1752 vhtcap = frm; 1753 break; 1754 case IEEE80211_ELEMID_VHT_OPMODE: 1755 vhtopmode = frm; 1756 break; 1757 } 1758 frm += frm[1] + 2; 1759 } 1760 1761 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1762 if (xrates != NULL) 1763 IEEE80211_VERIFY_ELEMENT(xrates, 1764 IEEE80211_RATE_MAXSIZE - rates[1], return); 1765 rate = ieee80211_setup_rates(ni, rates, xrates, 1766 IEEE80211_F_JOIN | 1767 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1768 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1769 if (rate & IEEE80211_RATE_BASIC) { 1770 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1771 wh->i_addr2, 1772 "%sassoc failed (rate set mismatch)", 1773 ISREASSOC(subtype) ? "re" : ""); 1774 vap->iv_stats.is_rx_assoc_norate++; 1775 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1776 IEEE80211_SCAN_FAIL_STATUS); 1777 return; 1778 } 1779 1780 ni->ni_capinfo = capinfo; 1781 ni->ni_associd = associd; 1782 if (ni->ni_jointime == 0) 1783 ni->ni_jointime = time_uptime; 1784 if (wme != NULL && 1785 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1786 ni->ni_flags |= IEEE80211_NODE_QOS; 1787 ieee80211_wme_updateparams(vap); 1788 } else 1789 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1790 /* 1791 * Setup HT state according to the negotiation. 1792 * 1793 * NB: shouldn't need to check if HT use is enabled but some 1794 * ap's send back HT ie's even when we don't indicate we 1795 * are HT capable in our AssocReq. 1796 */ 1797 if (htcap != NULL && htinfo != NULL && 1798 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1799 ieee80211_ht_node_init(ni); 1800 ieee80211_ht_updateparams(ni, htcap, htinfo); 1801 1802 if ((vhtcap != NULL) && (vhtopmode != NULL) & 1803 (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) { 1804 /* 1805 * Log if we get a VHT assoc/reassoc response. 1806 * We aren't ready for 2GHz VHT support. 1807 */ 1808 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) { 1809 printf("%s: peer %6D: VHT on 2GHz, ignoring\n", 1810 __func__, 1811 ni->ni_macaddr, 1812 ":"); 1813 } else { 1814 ieee80211_vht_node_init(ni); 1815 ieee80211_vht_updateparams(ni, vhtcap, vhtopmode); 1816 ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode); 1817 } 1818 } 1819 1820 ieee80211_ht_updateparams_final(ni, htcap, htinfo); 1821 ieee80211_setup_htrates(ni, htcap, 1822 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1823 ieee80211_setup_basic_htrates(ni, htinfo); 1824 1825 ieee80211_node_setuptxparms(ni); 1826 ieee80211_ratectl_node_init(ni); 1827 } 1828 1829 /* 1830 * Always initialise FF/superg state; we can use this 1831 * for doing A-MSDU encapsulation as well. 1832 */ 1833 #ifdef IEEE80211_SUPPORT_SUPERG 1834 ieee80211_ff_node_init(ni); 1835 #endif 1836 1837 /* 1838 * Configure state now that we are associated. 1839 * 1840 * XXX may need different/additional driver callbacks? 1841 */ 1842 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1843 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1844 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1845 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1846 } else { 1847 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1848 ic->ic_flags |= IEEE80211_F_USEBARKER; 1849 } 1850 ieee80211_set_shortslottime(ic, 1851 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1852 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1853 /* 1854 * Honor ERP protection. 1855 * 1856 * NB: ni_erp should zero for non-11g operation. 1857 */ 1858 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1859 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1860 ic->ic_flags |= IEEE80211_F_USEPROT; 1861 else 1862 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1863 IEEE80211_NOTE_MAC(vap, 1864 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1865 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1866 ISREASSOC(subtype) ? "re" : "", 1867 IEEE80211_NODE_AID(ni), 1868 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1869 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1870 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1871 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1872 ni->ni_flags & IEEE80211_NODE_HT ? 1873 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1874 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1875 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1876 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1877 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1878 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1879 ", fast-frames" : "", 1880 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1881 ", turbo" : "" 1882 ); 1883 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1884 break; 1885 } 1886 1887 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1888 uint16_t reason; 1889 1890 if (vap->iv_state == IEEE80211_S_SCAN) { 1891 vap->iv_stats.is_rx_mgtdiscard++; 1892 return; 1893 } 1894 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1895 /* NB: can happen when in promiscuous mode */ 1896 vap->iv_stats.is_rx_mgtdiscard++; 1897 break; 1898 } 1899 1900 /* 1901 * deauth frame format 1902 * [2] reason 1903 */ 1904 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1905 reason = le16toh(*(uint16_t *)frm); 1906 1907 vap->iv_stats.is_rx_deauth++; 1908 vap->iv_stats.is_rx_deauth_code = reason; 1909 IEEE80211_NODE_STAT(ni, rx_deauth); 1910 1911 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1912 "recv deauthenticate (reason: %d (%s))", reason, 1913 ieee80211_reason_to_string(reason)); 1914 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1915 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1916 break; 1917 } 1918 1919 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1920 uint16_t reason; 1921 1922 if (vap->iv_state != IEEE80211_S_RUN && 1923 vap->iv_state != IEEE80211_S_ASSOC && 1924 vap->iv_state != IEEE80211_S_AUTH) { 1925 vap->iv_stats.is_rx_mgtdiscard++; 1926 return; 1927 } 1928 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1929 /* NB: can happen when in promiscuous mode */ 1930 vap->iv_stats.is_rx_mgtdiscard++; 1931 break; 1932 } 1933 1934 /* 1935 * disassoc frame format 1936 * [2] reason 1937 */ 1938 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1939 reason = le16toh(*(uint16_t *)frm); 1940 1941 vap->iv_stats.is_rx_disassoc++; 1942 vap->iv_stats.is_rx_disassoc_code = reason; 1943 IEEE80211_NODE_STAT(ni, rx_disassoc); 1944 1945 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1946 "recv disassociate (reason: %d (%s))", reason, 1947 ieee80211_reason_to_string(reason)); 1948 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1949 break; 1950 } 1951 1952 case IEEE80211_FC0_SUBTYPE_ACTION: 1953 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1954 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1955 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1956 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1957 wh, NULL, "%s", "not for us"); 1958 vap->iv_stats.is_rx_mgtdiscard++; 1959 } else if (vap->iv_state != IEEE80211_S_RUN) { 1960 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1961 wh, NULL, "wrong state %s", 1962 ieee80211_state_name[vap->iv_state]); 1963 vap->iv_stats.is_rx_mgtdiscard++; 1964 } else { 1965 if (ieee80211_parse_action(ni, m0) == 0) 1966 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1967 } 1968 break; 1969 1970 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1971 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1972 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1973 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1974 case IEEE80211_FC0_SUBTYPE_ATIM: 1975 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1976 wh, NULL, "%s", "not handled"); 1977 vap->iv_stats.is_rx_mgtdiscard++; 1978 break; 1979 1980 default: 1981 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1982 wh, "mgt", "subtype 0x%x not handled", subtype); 1983 vap->iv_stats.is_rx_badsubtype++; 1984 break; 1985 } 1986 #undef ISREASSOC 1987 } 1988 1989 static void 1990 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1991 { 1992 switch (subtype) { 1993 case IEEE80211_FC0_SUBTYPE_BAR: 1994 ieee80211_recv_bar(ni, m); 1995 break; 1996 } 1997 } 1998