ieee80211_sta.c revision 190391
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: head/sys/net80211/ieee80211_sta.c 190391 2009-03-24 20:39:08Z sam $"); 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/ethernet.h> 54 55#include <net/bpf.h> 56 57#include <net80211/ieee80211_var.h> 58#include <net80211/ieee80211_sta.h> 59#include <net80211/ieee80211_input.h> 60#ifdef IEEE80211_SUPPORT_SUPERG 61#include <net80211/ieee80211_superg.h> 62#endif 63 64#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 65 66static void sta_vattach(struct ieee80211vap *); 67static void sta_beacon_miss(struct ieee80211vap *); 68static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69static int sta_input(struct ieee80211_node *, struct mbuf *, 70 int rssi, int noise, uint32_t rstamp); 71static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 72 int subtype, int rssi, int noise, uint32_t rstamp); 73 74void 75ieee80211_sta_attach(struct ieee80211com *ic) 76{ 77 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 78} 79 80void 81ieee80211_sta_detach(struct ieee80211com *ic) 82{ 83} 84 85static void 86sta_vdetach(struct ieee80211vap *vap) 87{ 88} 89 90static void 91sta_vattach(struct ieee80211vap *vap) 92{ 93 vap->iv_newstate = sta_newstate; 94 vap->iv_input = sta_input; 95 vap->iv_recv_mgmt = sta_recv_mgmt; 96 vap->iv_opdetach = sta_vdetach; 97 vap->iv_bmiss = sta_beacon_miss; 98} 99 100/* 101 * Handle a beacon miss event. The common code filters out 102 * spurious events that can happen when scanning and/or before 103 * reaching RUN state. 104 */ 105static void 106sta_beacon_miss(struct ieee80211vap *vap) 107{ 108 struct ieee80211com *ic = vap->iv_ic; 109 110 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 111 KASSERT(vap->iv_state == IEEE80211_S_RUN, 112 ("wrong state %d", vap->iv_state)); 113 114 IEEE80211_DPRINTF(vap, 115 IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 116 "beacon miss, mode %u state %s\n", 117 vap->iv_opmode, ieee80211_state_name[vap->iv_state]); 118 119 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 120 /* 121 * Send a directed probe req before falling back to a 122 * scan; if we receive a response ic_bmiss_count will 123 * be reset. Some cards mistakenly report beacon miss 124 * so this avoids the expensive scan if the ap is 125 * still there. 126 */ 127 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 128 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 129 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 130 return; 131 } 132 vap->iv_bmiss_count = 0; 133 vap->iv_stats.is_beacon_miss++; 134 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 135#ifdef IEEE80211_SUPPORT_SUPERG 136 /* 137 * If we receive a beacon miss interrupt when using 138 * dynamic turbo, attempt to switch modes before 139 * reassociating. 140 */ 141 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 142 ieee80211_dturbo_switch(vap, 143 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 144#endif 145 /* 146 * Try to reassociate before scanning for a new ap. 147 */ 148 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 149 } else { 150 /* 151 * Somebody else is controlling state changes (e.g. 152 * a user-mode app) don't do anything that would 153 * confuse them; just drop into scan mode so they'll 154 * notified of the state change and given control. 155 */ 156 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 157 } 158} 159 160/* 161 * Handle deauth with reason. We retry only for 162 * the cases where we might succeed. Otherwise 163 * we downgrade the ap and scan. 164 */ 165static void 166sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 167{ 168 switch (reason) { 169 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 170 case IEEE80211_STATUS_TIMEOUT: 171 case IEEE80211_REASON_ASSOC_EXPIRE: 172 case IEEE80211_REASON_NOT_AUTHED: 173 case IEEE80211_REASON_NOT_ASSOCED: 174 case IEEE80211_REASON_ASSOC_LEAVE: 175 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 176 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 177 break; 178 default: 179 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 180 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 181 ieee80211_check_scan_current(vap); 182 break; 183 } 184} 185 186/* 187 * IEEE80211_M_STA vap state machine handler. 188 * This routine handles the main states in the 802.11 protocol. 189 */ 190static int 191sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 192{ 193 struct ieee80211com *ic = vap->iv_ic; 194 struct ieee80211_node *ni; 195 enum ieee80211_state ostate; 196 197 IEEE80211_LOCK_ASSERT(ic); 198 199 ostate = vap->iv_state; 200 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 201 __func__, ieee80211_state_name[ostate], 202 ieee80211_state_name[nstate], arg); 203 vap->iv_state = nstate; /* state transition */ 204 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 205 if (ostate != IEEE80211_S_SCAN) 206 ieee80211_cancel_scan(vap); /* background scan */ 207 ni = vap->iv_bss; /* NB: no reference held */ 208 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 209 callout_stop(&vap->iv_swbmiss); 210 switch (nstate) { 211 case IEEE80211_S_INIT: 212 switch (ostate) { 213 case IEEE80211_S_SLEEP: 214 /* XXX wakeup */ 215 case IEEE80211_S_RUN: 216 IEEE80211_SEND_MGMT(ni, 217 IEEE80211_FC0_SUBTYPE_DISASSOC, 218 IEEE80211_REASON_ASSOC_LEAVE); 219 ieee80211_sta_leave(ni); 220 break; 221 case IEEE80211_S_ASSOC: 222 IEEE80211_SEND_MGMT(ni, 223 IEEE80211_FC0_SUBTYPE_DEAUTH, 224 IEEE80211_REASON_AUTH_LEAVE); 225 break; 226 case IEEE80211_S_SCAN: 227 ieee80211_cancel_scan(vap); 228 break; 229 default: 230 goto invalid; 231 } 232 if (ostate != IEEE80211_S_INIT) { 233 /* NB: optimize INIT -> INIT case */ 234 ieee80211_reset_bss(vap); 235 } 236 if (vap->iv_auth->ia_detach != NULL) 237 vap->iv_auth->ia_detach(vap); 238 break; 239 case IEEE80211_S_SCAN: 240 switch (ostate) { 241 case IEEE80211_S_INIT: 242 /* 243 * Initiate a scan. We can come here as a result 244 * of an IEEE80211_IOC_SCAN_REQ too in which case 245 * the vap will be marked with IEEE80211_FEXT_SCANREQ 246 * and the scan request parameters will be present 247 * in iv_scanreq. Otherwise we do the default. 248 */ 249 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 250 ieee80211_check_scan(vap, 251 vap->iv_scanreq_flags, 252 vap->iv_scanreq_duration, 253 vap->iv_scanreq_mindwell, 254 vap->iv_scanreq_maxdwell, 255 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 256 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 257 } else 258 ieee80211_check_scan_current(vap); 259 break; 260 case IEEE80211_S_SCAN: 261 case IEEE80211_S_AUTH: 262 case IEEE80211_S_ASSOC: 263 /* 264 * These can happen either because of a timeout 265 * on an assoc/auth response or because of a 266 * change in state that requires a reset. For 267 * the former we're called with a non-zero arg 268 * that is the cause for the failure; pass this 269 * to the scan code so it can update state. 270 * Otherwise trigger a new scan unless we're in 271 * manual roaming mode in which case an application 272 * must issue an explicit scan request. 273 */ 274 if (arg != 0) 275 ieee80211_scan_assoc_fail(vap, 276 vap->iv_bss->ni_macaddr, arg); 277 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 278 ieee80211_check_scan_current(vap); 279 break; 280 case IEEE80211_S_RUN: /* beacon miss */ 281 /* 282 * Beacon miss. Notify user space and if not 283 * under control of a user application (roaming 284 * manual) kick off a scan to re-connect. 285 */ 286 ieee80211_sta_leave(ni); 287 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 288 ieee80211_check_scan_current(vap); 289 break; 290 default: 291 goto invalid; 292 } 293 break; 294 case IEEE80211_S_AUTH: 295 switch (ostate) { 296 case IEEE80211_S_INIT: 297 case IEEE80211_S_SCAN: 298 IEEE80211_SEND_MGMT(ni, 299 IEEE80211_FC0_SUBTYPE_AUTH, 1); 300 break; 301 case IEEE80211_S_AUTH: 302 case IEEE80211_S_ASSOC: 303 switch (arg & 0xff) { 304 case IEEE80211_FC0_SUBTYPE_AUTH: 305 /* ??? */ 306 IEEE80211_SEND_MGMT(ni, 307 IEEE80211_FC0_SUBTYPE_AUTH, 2); 308 break; 309 case IEEE80211_FC0_SUBTYPE_DEAUTH: 310 sta_authretry(vap, ni, arg>>8); 311 break; 312 } 313 break; 314 case IEEE80211_S_RUN: 315 switch (arg & 0xff) { 316 case IEEE80211_FC0_SUBTYPE_AUTH: 317 IEEE80211_SEND_MGMT(ni, 318 IEEE80211_FC0_SUBTYPE_AUTH, 2); 319 vap->iv_state = ostate; /* stay RUN */ 320 break; 321 case IEEE80211_FC0_SUBTYPE_DEAUTH: 322 ieee80211_sta_leave(ni); 323 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 324 /* try to reauth */ 325 IEEE80211_SEND_MGMT(ni, 326 IEEE80211_FC0_SUBTYPE_AUTH, 1); 327 } 328 break; 329 } 330 break; 331 default: 332 goto invalid; 333 } 334 break; 335 case IEEE80211_S_ASSOC: 336 switch (ostate) { 337 case IEEE80211_S_AUTH: 338 case IEEE80211_S_ASSOC: 339 IEEE80211_SEND_MGMT(ni, 340 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 341 break; 342 case IEEE80211_S_SLEEP: /* cannot happen */ 343 case IEEE80211_S_RUN: 344 ieee80211_sta_leave(ni); 345 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 346 IEEE80211_SEND_MGMT(ni, arg ? 347 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 348 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 349 } 350 break; 351 default: 352 goto invalid; 353 } 354 break; 355 case IEEE80211_S_RUN: 356 if (vap->iv_flags & IEEE80211_F_WPA) { 357 /* XXX validate prerequisites */ 358 } 359 switch (ostate) { 360 case IEEE80211_S_RUN: 361 break; 362 case IEEE80211_S_AUTH: /* when join is done in fw */ 363 case IEEE80211_S_ASSOC: 364#ifdef IEEE80211_DEBUG 365 if (ieee80211_msg_debug(vap)) { 366 ieee80211_note(vap, "%s with %s ssid ", 367 (vap->iv_opmode == IEEE80211_M_STA ? 368 "associated" : "synchronized"), 369 ether_sprintf(ni->ni_bssid)); 370 ieee80211_print_essid(vap->iv_bss->ni_essid, 371 ni->ni_esslen); 372 /* XXX MCS/HT */ 373 printf(" channel %d start %uMb\n", 374 ieee80211_chan2ieee(ic, ic->ic_curchan), 375 IEEE80211_RATE2MBS(ni->ni_txrate)); 376 } 377#endif 378 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 379 ieee80211_notify_node_join(ni, 380 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 381 break; 382 case IEEE80211_S_SLEEP: 383 ieee80211_sta_pwrsave(vap, 0); 384 break; 385 default: 386 goto invalid; 387 } 388 ieee80211_sync_curchan(ic); 389 if (ostate != IEEE80211_S_RUN && 390 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 391 /* 392 * Start s/w beacon miss timer for devices w/o 393 * hardware support. We fudge a bit here since 394 * we're doing this in software. 395 */ 396 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 397 2 * vap->iv_bmissthreshold * ni->ni_intval); 398 vap->iv_swbmiss_count = 0; 399 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 400 ieee80211_swbmiss, vap); 401 } 402 /* 403 * When 802.1x is not in use mark the port authorized 404 * at this point so traffic can flow. 405 */ 406 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 407 ieee80211_node_authorize(ni); 408 /* 409 * Fake association when joining an existing bss. 410 */ 411 if (ic->ic_newassoc != NULL) 412 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 413 break; 414 case IEEE80211_S_SLEEP: 415 ieee80211_sta_pwrsave(vap, 0); 416 break; 417 default: 418 invalid: 419 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 420 "%s: unexpected state transition %s -> %s\n", __func__, 421 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 422 break; 423 } 424 return 0; 425} 426 427/* 428 * Return non-zero if the frame is an echo of a multicast 429 * frame sent by ourself. The dir is known to be DSTODS. 430 */ 431static __inline int 432isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 433{ 434#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 435#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 436 const uint8_t *sa; 437 438 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 439 440 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 441 return 0; 442 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 443 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 444#undef WH4 445#undef QWH4 446} 447 448/* 449 * Return non-zero if the frame is an echo of a multicast 450 * frame sent by ourself. The dir is known to be FROMDS. 451 */ 452static __inline int 453isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 454{ 455 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 456 457 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 458 return 0; 459 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 460} 461 462/* 463 * Decide if a received management frame should be 464 * printed when debugging is enabled. This filters some 465 * of the less interesting frames that come frequently 466 * (e.g. beacons). 467 */ 468static __inline int 469doprint(struct ieee80211vap *vap, int subtype) 470{ 471 switch (subtype) { 472 case IEEE80211_FC0_SUBTYPE_BEACON: 473 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 474 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 475 return 0; 476 } 477 return 1; 478} 479 480/* 481 * Process a received frame. The node associated with the sender 482 * should be supplied. If nothing was found in the node table then 483 * the caller is assumed to supply a reference to iv_bss instead. 484 * The RSSI and a timestamp are also supplied. The RSSI data is used 485 * during AP scanning to select a AP to associate with; it can have 486 * any units so long as values have consistent units and higher values 487 * mean ``better signal''. The receive timestamp is currently not used 488 * by the 802.11 layer. 489 */ 490static int 491sta_input(struct ieee80211_node *ni, struct mbuf *m, 492 int rssi, int noise, uint32_t rstamp) 493{ 494#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 495#define HAS_SEQ(type) ((type & 0x4) == 0) 496 struct ieee80211vap *vap = ni->ni_vap; 497 struct ieee80211com *ic = ni->ni_ic; 498 struct ifnet *ifp = vap->iv_ifp; 499 struct ieee80211_frame *wh; 500 struct ieee80211_key *key; 501 struct ether_header *eh; 502 int hdrspace, need_tap; 503 uint8_t dir, type, subtype, qos; 504 uint8_t *bssid; 505 uint16_t rxseq; 506 507 if (m->m_flags & M_AMPDU_MPDU) { 508 /* 509 * Fastpath for A-MPDU reorder q resubmission. Frames 510 * w/ M_AMPDU_MPDU marked have already passed through 511 * here but were received out of order and been held on 512 * the reorder queue. When resubmitted they are marked 513 * with the M_AMPDU_MPDU flag and we can bypass most of 514 * the normal processing. 515 */ 516 wh = mtod(m, struct ieee80211_frame *); 517 type = IEEE80211_FC0_TYPE_DATA; 518 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 519 subtype = IEEE80211_FC0_SUBTYPE_QOS; 520 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 521 goto resubmit_ampdu; 522 } 523 524 KASSERT(ni != NULL, ("null node")); 525 ni->ni_inact = ni->ni_inact_reload; 526 527 need_tap = 1; /* mbuf need to be tapped. */ 528 type = -1; /* undefined */ 529 530 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 531 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 532 ni->ni_macaddr, NULL, 533 "too short (1): len %u", m->m_pkthdr.len); 534 vap->iv_stats.is_rx_tooshort++; 535 goto out; 536 } 537 /* 538 * Bit of a cheat here, we use a pointer for a 3-address 539 * frame format but don't reference fields past outside 540 * ieee80211_frame_min w/o first validating the data is 541 * present. 542 */ 543 wh = mtod(m, struct ieee80211_frame *); 544 545 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 546 IEEE80211_FC0_VERSION_0) { 547 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 548 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 549 vap->iv_stats.is_rx_badversion++; 550 goto err; 551 } 552 553 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 554 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 555 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 556 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 557 bssid = wh->i_addr2; 558 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 559 /* not interested in */ 560 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 561 bssid, NULL, "%s", "not to bss"); 562 vap->iv_stats.is_rx_wrongbss++; 563 goto out; 564 } 565 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 566 ni->ni_noise = noise; 567 ni->ni_rstamp = rstamp; 568 if (HAS_SEQ(type)) { 569 uint8_t tid = ieee80211_gettid(wh); 570 if (IEEE80211_QOS_HAS_SEQ(wh) && 571 TID_TO_WME_AC(tid) >= WME_AC_VI) 572 ic->ic_wme.wme_hipri_traffic++; 573 rxseq = le16toh(*(uint16_t *)wh->i_seq); 574 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 575 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 576 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 577 /* duplicate, discard */ 578 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 579 bssid, "duplicate", 580 "seqno <%u,%u> fragno <%u,%u> tid %u", 581 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 582 ni->ni_rxseqs[tid] >> 583 IEEE80211_SEQ_SEQ_SHIFT, 584 rxseq & IEEE80211_SEQ_FRAG_MASK, 585 ni->ni_rxseqs[tid] & 586 IEEE80211_SEQ_FRAG_MASK, 587 tid); 588 vap->iv_stats.is_rx_dup++; 589 IEEE80211_NODE_STAT(ni, rx_dup); 590 goto out; 591 } 592 ni->ni_rxseqs[tid] = rxseq; 593 } 594 } 595 596 switch (type) { 597 case IEEE80211_FC0_TYPE_DATA: 598 hdrspace = ieee80211_hdrspace(ic, wh); 599 if (m->m_len < hdrspace && 600 (m = m_pullup(m, hdrspace)) == NULL) { 601 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 602 ni->ni_macaddr, NULL, 603 "data too short: expecting %u", hdrspace); 604 vap->iv_stats.is_rx_tooshort++; 605 goto out; /* XXX */ 606 } 607 /* 608 * Handle A-MPDU re-ordering. If the frame is to be 609 * processed directly then ieee80211_ampdu_reorder 610 * will return 0; otherwise it has consumed the mbuf 611 * and we should do nothing more with it. 612 */ 613 if ((m->m_flags & M_AMPDU) && 614 (dir == IEEE80211_FC1_DIR_FROMDS || 615 dir == IEEE80211_FC1_DIR_DSTODS) && 616 ieee80211_ampdu_reorder(ni, m) != 0) { 617 m = NULL; 618 goto out; 619 } 620 resubmit_ampdu: 621 if (dir == IEEE80211_FC1_DIR_FROMDS) { 622 if ((ifp->if_flags & IFF_SIMPLEX) && 623 isfromds_mcastecho(vap, wh)) { 624 /* 625 * In IEEE802.11 network, multicast 626 * packets sent from "me" are broadcast 627 * from the AP; silently discard for 628 * SIMPLEX interface. 629 */ 630 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 631 wh, "data", "%s", "multicast echo"); 632 vap->iv_stats.is_rx_mcastecho++; 633 goto out; 634 } 635 if ((vap->iv_flags & IEEE80211_F_DWDS) && 636 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 637 /* 638 * DWDS sta's must drop 3-address mcast frames 639 * as they will be sent separately as a 4-addr 640 * frame. Accepting the 3-addr frame will 641 * confuse the bridge into thinking the sending 642 * sta is located at the end of WDS link. 643 */ 644 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 645 "3-address data", "%s", "DWDS enabled"); 646 vap->iv_stats.is_rx_mcastecho++; 647 goto out; 648 } 649 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 650 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 651 IEEE80211_DISCARD(vap, 652 IEEE80211_MSG_INPUT, wh, "4-address data", 653 "%s", "DWDS not enabled"); 654 vap->iv_stats.is_rx_wrongdir++; 655 goto out; 656 } 657 if ((ifp->if_flags & IFF_SIMPLEX) && 658 isdstods_mcastecho(vap, wh)) { 659 /* 660 * In IEEE802.11 network, multicast 661 * packets sent from "me" are broadcast 662 * from the AP; silently discard for 663 * SIMPLEX interface. 664 */ 665 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 666 "4-address data", "%s", "multicast echo"); 667 vap->iv_stats.is_rx_mcastecho++; 668 goto out; 669 } 670 } else { 671 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 672 "data", "incorrect dir 0x%x", dir); 673 vap->iv_stats.is_rx_wrongdir++; 674 goto out; 675 } 676 677 /* 678 * Handle privacy requirements. Note that we 679 * must not be preempted from here until after 680 * we (potentially) call ieee80211_crypto_demic; 681 * otherwise we may violate assumptions in the 682 * crypto cipher modules used to do delayed update 683 * of replay sequence numbers. 684 */ 685 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 686 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 687 /* 688 * Discard encrypted frames when privacy is off. 689 */ 690 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 691 wh, "WEP", "%s", "PRIVACY off"); 692 vap->iv_stats.is_rx_noprivacy++; 693 IEEE80211_NODE_STAT(ni, rx_noprivacy); 694 goto out; 695 } 696 key = ieee80211_crypto_decap(ni, m, hdrspace); 697 if (key == NULL) { 698 /* NB: stats+msgs handled in crypto_decap */ 699 IEEE80211_NODE_STAT(ni, rx_wepfail); 700 goto out; 701 } 702 wh = mtod(m, struct ieee80211_frame *); 703 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 704 } else { 705 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 706 key = NULL; 707 } 708 709 /* 710 * Save QoS bits for use below--before we strip the header. 711 */ 712 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 713 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 714 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 715 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 716 } else 717 qos = 0; 718 719 /* 720 * Next up, any fragmentation. 721 */ 722 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 723 m = ieee80211_defrag(ni, m, hdrspace); 724 if (m == NULL) { 725 /* Fragment dropped or frame not complete yet */ 726 goto out; 727 } 728 } 729 wh = NULL; /* no longer valid, catch any uses */ 730 731 /* 732 * Next strip any MSDU crypto bits. 733 */ 734 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 735 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 736 ni->ni_macaddr, "data", "%s", "demic error"); 737 vap->iv_stats.is_rx_demicfail++; 738 IEEE80211_NODE_STAT(ni, rx_demicfail); 739 goto out; 740 } 741 742 /* copy to listener after decrypt */ 743 if (bpf_peers_present(vap->iv_rawbpf)) 744 bpf_mtap(vap->iv_rawbpf, m); 745 need_tap = 0; 746 747 /* 748 * Finally, strip the 802.11 header. 749 */ 750 m = ieee80211_decap(vap, m, hdrspace); 751 if (m == NULL) { 752 /* XXX mask bit to check for both */ 753 /* don't count Null data frames as errors */ 754 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 755 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 756 goto out; 757 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 758 ni->ni_macaddr, "data", "%s", "decap error"); 759 vap->iv_stats.is_rx_decap++; 760 IEEE80211_NODE_STAT(ni, rx_decap); 761 goto err; 762 } 763 eh = mtod(m, struct ether_header *); 764 if (!ieee80211_node_is_authorized(ni)) { 765 /* 766 * Deny any non-PAE frames received prior to 767 * authorization. For open/shared-key 768 * authentication the port is mark authorized 769 * after authentication completes. For 802.1x 770 * the port is not marked authorized by the 771 * authenticator until the handshake has completed. 772 */ 773 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 774 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 775 eh->ether_shost, "data", 776 "unauthorized port: ether type 0x%x len %u", 777 eh->ether_type, m->m_pkthdr.len); 778 vap->iv_stats.is_rx_unauth++; 779 IEEE80211_NODE_STAT(ni, rx_unauth); 780 goto err; 781 } 782 } else { 783 /* 784 * When denying unencrypted frames, discard 785 * any non-PAE frames received without encryption. 786 */ 787 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 788 (key == NULL && (m->m_flags & M_WEP) == 0) && 789 eh->ether_type != htons(ETHERTYPE_PAE)) { 790 /* 791 * Drop unencrypted frames. 792 */ 793 vap->iv_stats.is_rx_unencrypted++; 794 IEEE80211_NODE_STAT(ni, rx_unencrypted); 795 goto out; 796 } 797 } 798 /* XXX require HT? */ 799 if (qos & IEEE80211_QOS_AMSDU) { 800 m = ieee80211_decap_amsdu(ni, m); 801 if (m == NULL) 802 return IEEE80211_FC0_TYPE_DATA; 803 } else { 804#ifdef IEEE80211_SUPPORT_SUPERG 805 m = ieee80211_decap_fastframe(vap, ni, m); 806 if (m == NULL) 807 return IEEE80211_FC0_TYPE_DATA; 808#endif 809 } 810 ieee80211_deliver_data(vap, ni, m); 811 return IEEE80211_FC0_TYPE_DATA; 812 813 case IEEE80211_FC0_TYPE_MGT: 814 vap->iv_stats.is_rx_mgmt++; 815 IEEE80211_NODE_STAT(ni, rx_mgmt); 816 if (dir != IEEE80211_FC1_DIR_NODS) { 817 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 818 wh, "data", "incorrect dir 0x%x", dir); 819 vap->iv_stats.is_rx_wrongdir++; 820 goto err; 821 } 822 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 823 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 824 ni->ni_macaddr, "mgt", "too short: len %u", 825 m->m_pkthdr.len); 826 vap->iv_stats.is_rx_tooshort++; 827 goto out; 828 } 829#ifdef IEEE80211_DEBUG 830 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 831 ieee80211_msg_dumppkts(vap)) { 832 if_printf(ifp, "received %s from %s rssi %d\n", 833 ieee80211_mgt_subtype_name[subtype >> 834 IEEE80211_FC0_SUBTYPE_SHIFT], 835 ether_sprintf(wh->i_addr2), rssi); 836 } 837#endif 838 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 839 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 840 /* 841 * Only shared key auth frames with a challenge 842 * should be encrypted, discard all others. 843 */ 844 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 845 wh, ieee80211_mgt_subtype_name[subtype >> 846 IEEE80211_FC0_SUBTYPE_SHIFT], 847 "%s", "WEP set but not permitted"); 848 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 849 goto out; 850 } 851 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 852 /* 853 * Discard encrypted frames when privacy is off. 854 */ 855 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 856 wh, "mgt", "%s", "WEP set but PRIVACY off"); 857 vap->iv_stats.is_rx_noprivacy++; 858 goto out; 859 } 860 hdrspace = ieee80211_hdrspace(ic, wh); 861 key = ieee80211_crypto_decap(ni, m, hdrspace); 862 if (key == NULL) { 863 /* NB: stats+msgs handled in crypto_decap */ 864 goto out; 865 } 866 wh = mtod(m, struct ieee80211_frame *); 867 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 868 } 869 if (bpf_peers_present(vap->iv_rawbpf)) 870 bpf_mtap(vap->iv_rawbpf, m); 871 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 872 m_freem(m); 873 return IEEE80211_FC0_TYPE_MGT; 874 875 case IEEE80211_FC0_TYPE_CTL: 876 vap->iv_stats.is_rx_ctl++; 877 IEEE80211_NODE_STAT(ni, rx_ctrl); 878 goto out; 879 default: 880 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 881 wh, NULL, "bad frame type 0x%x", type); 882 /* should not come here */ 883 break; 884 } 885err: 886 ifp->if_ierrors++; 887out: 888 if (m != NULL) { 889 if (bpf_peers_present(vap->iv_rawbpf) && need_tap) 890 bpf_mtap(vap->iv_rawbpf, m); 891 m_freem(m); 892 } 893 return type; 894#undef SEQ_LEQ 895} 896 897static void 898sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 899 int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) 900{ 901 struct ieee80211vap *vap = ni->ni_vap; 902 903 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 904 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 905 ni->ni_macaddr, "open auth", 906 "bad sta auth mode %u", ni->ni_authmode); 907 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 908 return; 909 } 910 if (vap->iv_state != IEEE80211_S_AUTH || 911 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 912 vap->iv_stats.is_rx_bad_auth++; 913 return; 914 } 915 if (status != 0) { 916 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 917 ni, "open auth failed (reason %d)", status); 918 vap->iv_stats.is_rx_auth_fail++; 919 vap->iv_stats.is_rx_authfail_code = status; 920 ieee80211_new_state(vap, IEEE80211_S_SCAN, 921 IEEE80211_SCAN_FAIL_STATUS); 922 } else 923 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 924} 925 926static void 927sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 928 uint8_t *frm, uint8_t *efrm, int rssi, int noise, uint32_t rstamp, 929 uint16_t seq, uint16_t status) 930{ 931 struct ieee80211vap *vap = ni->ni_vap; 932 uint8_t *challenge; 933 int estatus; 934 935 /* 936 * NB: this can happen as we allow pre-shared key 937 * authentication to be enabled w/o wep being turned 938 * on so that configuration of these can be done 939 * in any order. It may be better to enforce the 940 * ordering in which case this check would just be 941 * for sanity/consistency. 942 */ 943 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 944 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 945 ni->ni_macaddr, "shared key auth", 946 "%s", " PRIVACY is disabled"); 947 estatus = IEEE80211_STATUS_ALG; 948 goto bad; 949 } 950 /* 951 * Pre-shared key authentication is evil; accept 952 * it only if explicitly configured (it is supported 953 * mainly for compatibility with clients like OS X). 954 */ 955 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 956 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 957 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 958 ni->ni_macaddr, "shared key auth", 959 "bad sta auth mode %u", ni->ni_authmode); 960 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 961 estatus = IEEE80211_STATUS_ALG; 962 goto bad; 963 } 964 965 challenge = NULL; 966 if (frm + 1 < efrm) { 967 if ((frm[1] + 2) > (efrm - frm)) { 968 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 969 ni->ni_macaddr, "shared key auth", 970 "ie %d/%d too long", 971 frm[0], (frm[1] + 2) - (efrm - frm)); 972 vap->iv_stats.is_rx_bad_auth++; 973 estatus = IEEE80211_STATUS_CHALLENGE; 974 goto bad; 975 } 976 if (*frm == IEEE80211_ELEMID_CHALLENGE) 977 challenge = frm; 978 frm += frm[1] + 2; 979 } 980 switch (seq) { 981 case IEEE80211_AUTH_SHARED_CHALLENGE: 982 case IEEE80211_AUTH_SHARED_RESPONSE: 983 if (challenge == NULL) { 984 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 985 ni->ni_macaddr, "shared key auth", 986 "%s", "no challenge"); 987 vap->iv_stats.is_rx_bad_auth++; 988 estatus = IEEE80211_STATUS_CHALLENGE; 989 goto bad; 990 } 991 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 992 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 993 ni->ni_macaddr, "shared key auth", 994 "bad challenge len %d", challenge[1]); 995 vap->iv_stats.is_rx_bad_auth++; 996 estatus = IEEE80211_STATUS_CHALLENGE; 997 goto bad; 998 } 999 default: 1000 break; 1001 } 1002 if (vap->iv_state != IEEE80211_S_AUTH) 1003 return; 1004 switch (seq) { 1005 case IEEE80211_AUTH_SHARED_PASS: 1006 if (ni->ni_challenge != NULL) { 1007 free(ni->ni_challenge, M_80211_NODE); 1008 ni->ni_challenge = NULL; 1009 } 1010 if (status != 0) { 1011 IEEE80211_NOTE_FRAME(vap, 1012 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1013 "shared key auth failed (reason %d)", status); 1014 vap->iv_stats.is_rx_auth_fail++; 1015 vap->iv_stats.is_rx_authfail_code = status; 1016 return; 1017 } 1018 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1019 break; 1020 case IEEE80211_AUTH_SHARED_CHALLENGE: 1021 if (!ieee80211_alloc_challenge(ni)) 1022 return; 1023 /* XXX could optimize by passing recvd challenge */ 1024 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1025 IEEE80211_SEND_MGMT(ni, 1026 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1027 break; 1028 default: 1029 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1030 wh, "shared key auth", "bad seq %d", seq); 1031 vap->iv_stats.is_rx_bad_auth++; 1032 return; 1033 } 1034 return; 1035bad: 1036 /* 1037 * Kick the state machine. This short-circuits 1038 * using the mgt frame timeout to trigger the 1039 * state transition. 1040 */ 1041 if (vap->iv_state == IEEE80211_S_AUTH) 1042 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1043 IEEE80211_SCAN_FAIL_STATUS); 1044} 1045 1046static int 1047ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1048 const struct ieee80211_frame *wh) 1049{ 1050#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1051 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1052 u_int len = frm[1], qosinfo; 1053 int i; 1054 1055 if (len < sizeof(struct ieee80211_wme_param)-2) { 1056 IEEE80211_DISCARD_IE(vap, 1057 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1058 wh, "WME", "too short, len %u", len); 1059 return -1; 1060 } 1061 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1062 qosinfo &= WME_QOSINFO_COUNT; 1063 /* XXX do proper check for wraparound */ 1064 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1065 return 0; 1066 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1067 for (i = 0; i < WME_NUM_AC; i++) { 1068 struct wmeParams *wmep = 1069 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1070 /* NB: ACI not used */ 1071 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1072 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1073 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1074 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1075 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1076 frm += 4; 1077 } 1078 wme->wme_wmeChanParams.cap_info = qosinfo; 1079 return 1; 1080#undef MS 1081} 1082 1083/* 1084 * Return non-zero if a background scan may be continued: 1085 * o bg scan is active 1086 * o no channel switch is pending 1087 * o there has not been any traffic recently 1088 * 1089 * Note we do not check if there is an administrative enable; 1090 * this is only done to start the scan. We assume that any 1091 * change in state will be accompanied by a request to cancel 1092 * active scans which will otherwise cause this test to fail. 1093 */ 1094static __inline int 1095contbgscan(struct ieee80211vap *vap) 1096{ 1097 struct ieee80211com *ic = vap->iv_ic; 1098 1099 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1100 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1101 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1102 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1103} 1104 1105/* 1106 * Return non-zero if a backgrond scan may be started: 1107 * o bg scanning is administratively enabled 1108 * o no channel switch is pending 1109 * o we are not boosted on a dynamic turbo channel 1110 * o there has not been a scan recently 1111 * o there has not been any traffic recently 1112 */ 1113static __inline int 1114startbgscan(struct ieee80211vap *vap) 1115{ 1116 struct ieee80211com *ic = vap->iv_ic; 1117 1118 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1119 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1120#ifdef IEEE80211_SUPPORT_SUPERG 1121 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1122#endif 1123 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1124 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1125} 1126 1127static void 1128sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1129 int subtype, int rssi, int noise, uint32_t rstamp) 1130{ 1131#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1132#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1133 struct ieee80211vap *vap = ni->ni_vap; 1134 struct ieee80211com *ic = ni->ni_ic; 1135 struct ieee80211_frame *wh; 1136 uint8_t *frm, *efrm; 1137 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1138 uint8_t rate; 1139 1140 wh = mtod(m0, struct ieee80211_frame *); 1141 frm = (uint8_t *)&wh[1]; 1142 efrm = mtod(m0, uint8_t *) + m0->m_len; 1143 switch (subtype) { 1144 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1145 case IEEE80211_FC0_SUBTYPE_BEACON: { 1146 struct ieee80211_scanparams scan; 1147 /* 1148 * We process beacon/probe response frames: 1149 * o when scanning, or 1150 * o station mode when associated (to collect state 1151 * updates such as 802.11g slot time), or 1152 * Frames otherwise received are discarded. 1153 */ 1154 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1155 vap->iv_stats.is_rx_mgtdiscard++; 1156 return; 1157 } 1158 /* XXX probe response in sta mode when !scanning? */ 1159 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1160 return; 1161 /* 1162 * Count frame now that we know it's to be processed. 1163 */ 1164 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1165 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1166 IEEE80211_NODE_STAT(ni, rx_beacons); 1167 } else 1168 IEEE80211_NODE_STAT(ni, rx_proberesp); 1169 /* 1170 * When operating in station mode, check for state updates. 1171 * Be careful to ignore beacons received while doing a 1172 * background scan. We consider only 11g/WMM stuff right now. 1173 */ 1174 if (ni->ni_associd != 0 && 1175 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1176 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1177 /* record tsf of last beacon */ 1178 memcpy(ni->ni_tstamp.data, scan.tstamp, 1179 sizeof(ni->ni_tstamp)); 1180 /* count beacon frame for s/w bmiss handling */ 1181 vap->iv_swbmiss_count++; 1182 vap->iv_bmiss_count = 0; 1183 if (ni->ni_erp != scan.erp) { 1184 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1185 wh->i_addr2, 1186 "erp change: was 0x%x, now 0x%x", 1187 ni->ni_erp, scan.erp); 1188 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1189 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1190 ic->ic_flags |= IEEE80211_F_USEPROT; 1191 else 1192 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1193 ni->ni_erp = scan.erp; 1194 /* XXX statistic */ 1195 /* XXX driver notification */ 1196 } 1197 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1198 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1199 wh->i_addr2, 1200 "capabilities change: was 0x%x, now 0x%x", 1201 ni->ni_capinfo, scan.capinfo); 1202 /* 1203 * NB: we assume short preamble doesn't 1204 * change dynamically 1205 */ 1206 ieee80211_set_shortslottime(ic, 1207 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1208 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1209 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1210 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1211 /* XXX statistic */ 1212 } 1213 if (scan.wme != NULL && 1214 (ni->ni_flags & IEEE80211_NODE_QOS) && 1215 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1216 ieee80211_wme_updateparams(vap); 1217#ifdef IEEE80211_SUPPORT_SUPERG 1218 if (scan.ath != NULL) 1219 ieee80211_parse_athparams(ni, scan.ath, wh); 1220#endif 1221 if (scan.htcap != NULL && scan.htinfo != NULL && 1222 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1223 ieee80211_ht_updateparams(ni, 1224 scan.htcap, scan.htinfo); 1225 /* XXX state changes? */ 1226 } 1227 if (scan.tim != NULL) { 1228 struct ieee80211_tim_ie *tim = 1229 (struct ieee80211_tim_ie *) scan.tim; 1230#if 0 1231 int aid = IEEE80211_AID(ni->ni_associd); 1232 int ix = aid / NBBY; 1233 int min = tim->tim_bitctl &~ 1; 1234 int max = tim->tim_len + min - 4; 1235 if ((tim->tim_bitctl&1) || 1236 (min <= ix && ix <= max && 1237 isset(tim->tim_bitmap - min, aid))) { 1238 /* 1239 * XXX Do not let bg scan kick off 1240 * we are expecting data. 1241 */ 1242 ic->ic_lastdata = ticks; 1243 ieee80211_sta_pwrsave(vap, 0); 1244 } 1245#endif 1246 ni->ni_dtim_count = tim->tim_count; 1247 ni->ni_dtim_period = tim->tim_period; 1248 } 1249 /* 1250 * If scanning, pass the info to the scan module. 1251 * Otherwise, check if it's the right time to do 1252 * a background scan. Background scanning must 1253 * be enabled and we must not be operating in the 1254 * turbo phase of dynamic turbo mode. Then, 1255 * it's been a while since the last background 1256 * scan and if no data frames have come through 1257 * recently, kick off a scan. Note that this 1258 * is the mechanism by which a background scan 1259 * is started _and_ continued each time we 1260 * return on-channel to receive a beacon from 1261 * our ap. 1262 */ 1263 if (ic->ic_flags & IEEE80211_F_SCAN) { 1264 ieee80211_add_scan(vap, &scan, wh, 1265 subtype, rssi, noise, rstamp); 1266 } else if (contbgscan(vap)) { 1267 ieee80211_bg_scan(vap, 0); 1268 } else if (startbgscan(vap)) { 1269 vap->iv_stats.is_scan_bg++; 1270#if 0 1271 /* wakeup if we are sleeing */ 1272 ieee80211_set_pwrsave(vap, 0); 1273#endif 1274 ieee80211_bg_scan(vap, 0); 1275 } 1276 return; 1277 } 1278 /* 1279 * If scanning, just pass information to the scan module. 1280 */ 1281 if (ic->ic_flags & IEEE80211_F_SCAN) { 1282 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1283 /* 1284 * Actively scanning a channel marked passive; 1285 * send a probe request now that we know there 1286 * is 802.11 traffic present. 1287 * 1288 * XXX check if the beacon we recv'd gives 1289 * us what we need and suppress the probe req 1290 */ 1291 ieee80211_probe_curchan(vap, 1); 1292 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1293 } 1294 ieee80211_add_scan(vap, &scan, wh, 1295 subtype, rssi, noise, rstamp); 1296 return; 1297 } 1298 break; 1299 } 1300 1301 case IEEE80211_FC0_SUBTYPE_AUTH: { 1302 uint16_t algo, seq, status; 1303 /* 1304 * auth frame format 1305 * [2] algorithm 1306 * [2] sequence 1307 * [2] status 1308 * [tlv*] challenge 1309 */ 1310 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1311 algo = le16toh(*(uint16_t *)frm); 1312 seq = le16toh(*(uint16_t *)(frm + 2)); 1313 status = le16toh(*(uint16_t *)(frm + 4)); 1314 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1315 "recv auth frame with algorithm %d seq %d", algo, seq); 1316 1317 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1318 IEEE80211_DISCARD(vap, 1319 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1320 wh, "auth", "%s", "TKIP countermeasures enabled"); 1321 vap->iv_stats.is_rx_auth_countermeasures++; 1322 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1323 ieee80211_send_error(ni, wh->i_addr2, 1324 IEEE80211_FC0_SUBTYPE_AUTH, 1325 IEEE80211_REASON_MIC_FAILURE); 1326 } 1327 return; 1328 } 1329 if (algo == IEEE80211_AUTH_ALG_SHARED) 1330 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, 1331 noise, rstamp, seq, status); 1332 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1333 sta_auth_open(ni, wh, rssi, noise, rstamp, 1334 seq, status); 1335 else { 1336 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1337 wh, "auth", "unsupported alg %d", algo); 1338 vap->iv_stats.is_rx_auth_unsupported++; 1339 return; 1340 } 1341 break; 1342 } 1343 1344 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1345 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1346 uint16_t capinfo, associd; 1347 uint16_t status; 1348 1349 if (vap->iv_state != IEEE80211_S_ASSOC) { 1350 vap->iv_stats.is_rx_mgtdiscard++; 1351 return; 1352 } 1353 1354 /* 1355 * asresp frame format 1356 * [2] capability information 1357 * [2] status 1358 * [2] association ID 1359 * [tlv] supported rates 1360 * [tlv] extended supported rates 1361 * [tlv] WME 1362 * [tlv] HT capabilities 1363 * [tlv] HT info 1364 */ 1365 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1366 ni = vap->iv_bss; 1367 capinfo = le16toh(*(uint16_t *)frm); 1368 frm += 2; 1369 status = le16toh(*(uint16_t *)frm); 1370 frm += 2; 1371 if (status != 0) { 1372 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1373 wh->i_addr2, "%sassoc failed (reason %d)", 1374 ISREASSOC(subtype) ? "re" : "", status); 1375 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1376 return; 1377 } 1378 associd = le16toh(*(uint16_t *)frm); 1379 frm += 2; 1380 1381 rates = xrates = wme = htcap = htinfo = NULL; 1382 while (efrm - frm > 1) { 1383 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1384 switch (*frm) { 1385 case IEEE80211_ELEMID_RATES: 1386 rates = frm; 1387 break; 1388 case IEEE80211_ELEMID_XRATES: 1389 xrates = frm; 1390 break; 1391 case IEEE80211_ELEMID_HTCAP: 1392 htcap = frm; 1393 break; 1394 case IEEE80211_ELEMID_HTINFO: 1395 htinfo = frm; 1396 break; 1397 case IEEE80211_ELEMID_VENDOR: 1398 if (iswmeoui(frm)) 1399 wme = frm; 1400 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1401 /* 1402 * Accept pre-draft HT ie's if the 1403 * standard ones have not been seen. 1404 */ 1405 if (ishtcapoui(frm)) { 1406 if (htcap == NULL) 1407 htcap = frm; 1408 } else if (ishtinfooui(frm)) { 1409 if (htinfo == NULL) 1410 htcap = frm; 1411 } 1412 } 1413 /* XXX Atheros OUI support */ 1414 break; 1415 } 1416 frm += frm[1] + 2; 1417 } 1418 1419 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1420 if (xrates != NULL) 1421 IEEE80211_VERIFY_ELEMENT(xrates, 1422 IEEE80211_RATE_MAXSIZE - rates[1], return); 1423 rate = ieee80211_setup_rates(ni, rates, xrates, 1424 IEEE80211_F_JOIN | 1425 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1426 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1427 if (rate & IEEE80211_RATE_BASIC) { 1428 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1429 wh->i_addr2, 1430 "%sassoc failed (rate set mismatch)", 1431 ISREASSOC(subtype) ? "re" : ""); 1432 vap->iv_stats.is_rx_assoc_norate++; 1433 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1434 IEEE80211_SCAN_FAIL_STATUS); 1435 return; 1436 } 1437 1438 ni->ni_capinfo = capinfo; 1439 ni->ni_associd = associd; 1440 if (ni->ni_jointime == 0) 1441 ni->ni_jointime = time_uptime; 1442 if (wme != NULL && 1443 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1444 ni->ni_flags |= IEEE80211_NODE_QOS; 1445 ieee80211_wme_updateparams(vap); 1446 } else 1447 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1448 /* 1449 * Setup HT state according to the negotiation. 1450 * 1451 * NB: shouldn't need to check if HT use is enabled but some 1452 * ap's send back HT ie's even when we don't indicate we 1453 * are HT capable in our AssocReq. 1454 */ 1455 if (htcap != NULL && htinfo != NULL && 1456 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1457 ieee80211_ht_node_init(ni); 1458 ieee80211_ht_updateparams(ni, htcap, htinfo); 1459 ieee80211_setup_htrates(ni, htcap, 1460 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1461 ieee80211_setup_basic_htrates(ni, htinfo); 1462 } 1463 /* 1464 * Configure state now that we are associated. 1465 * 1466 * XXX may need different/additional driver callbacks? 1467 */ 1468 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1469 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1470 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1471 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1472 } else { 1473 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1474 ic->ic_flags |= IEEE80211_F_USEBARKER; 1475 } 1476 ieee80211_set_shortslottime(ic, 1477 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1478 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1479 /* 1480 * Honor ERP protection. 1481 * 1482 * NB: ni_erp should zero for non-11g operation. 1483 */ 1484 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1485 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1486 ic->ic_flags |= IEEE80211_F_USEPROT; 1487 else 1488 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1489 IEEE80211_NOTE_MAC(vap, 1490 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1491 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1492 ISREASSOC(subtype) ? "re" : "", 1493 IEEE80211_NODE_AID(ni), 1494 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1495 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1496 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1497 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1498 ni->ni_flags & IEEE80211_NODE_HT ? 1499 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1500 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1501 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1502 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1503 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1504 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1505 ", fast-frames" : "", 1506 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1507 ", turbo" : "" 1508 ); 1509 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1510 break; 1511 } 1512 1513 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1514 uint16_t reason; 1515 1516 if (vap->iv_state == IEEE80211_S_SCAN) { 1517 vap->iv_stats.is_rx_mgtdiscard++; 1518 return; 1519 } 1520 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1521 /* NB: can happen when in promiscuous mode */ 1522 vap->iv_stats.is_rx_mgtdiscard++; 1523 break; 1524 } 1525 1526 /* 1527 * deauth frame format 1528 * [2] reason 1529 */ 1530 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1531 reason = le16toh(*(uint16_t *)frm); 1532 1533 vap->iv_stats.is_rx_deauth++; 1534 vap->iv_stats.is_rx_deauth_code = reason; 1535 IEEE80211_NODE_STAT(ni, rx_deauth); 1536 1537 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1538 "recv deauthenticate (reason %d)", reason); 1539 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1540 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1541 break; 1542 } 1543 1544 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1545 uint16_t reason; 1546 1547 if (vap->iv_state != IEEE80211_S_RUN && 1548 vap->iv_state != IEEE80211_S_ASSOC && 1549 vap->iv_state != IEEE80211_S_AUTH) { 1550 vap->iv_stats.is_rx_mgtdiscard++; 1551 return; 1552 } 1553 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1554 /* NB: can happen when in promiscuous mode */ 1555 vap->iv_stats.is_rx_mgtdiscard++; 1556 break; 1557 } 1558 1559 /* 1560 * disassoc frame format 1561 * [2] reason 1562 */ 1563 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1564 reason = le16toh(*(uint16_t *)frm); 1565 1566 vap->iv_stats.is_rx_disassoc++; 1567 vap->iv_stats.is_rx_disassoc_code = reason; 1568 IEEE80211_NODE_STAT(ni, rx_disassoc); 1569 1570 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1571 "recv disassociate (reason %d)", reason); 1572 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1573 break; 1574 } 1575 1576 case IEEE80211_FC0_SUBTYPE_ACTION: 1577 if (vap->iv_state == IEEE80211_S_RUN) { 1578 if (ieee80211_parse_action(ni, m0) == 0) 1579 ic->ic_recv_action(ni, frm, efrm); 1580 } else 1581 vap->iv_stats.is_rx_mgtdiscard++; 1582 break; 1583 1584 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1585 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1586 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1587 vap->iv_stats.is_rx_mgtdiscard++; 1588 return; 1589 default: 1590 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1591 wh, "mgt", "subtype 0x%x not handled", subtype); 1592 vap->iv_stats.is_rx_badsubtype++; 1593 break; 1594 } 1595#undef ISREASSOC 1596#undef ISPROBE 1597} 1598