ieee80211_sta.c revision 191546
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 191546 2009-04-26 21:46:04Z 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); 73static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 74 75void 76ieee80211_sta_attach(struct ieee80211com *ic) 77{ 78 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 79} 80 81void 82ieee80211_sta_detach(struct ieee80211com *ic) 83{ 84} 85 86static void 87sta_vdetach(struct ieee80211vap *vap) 88{ 89} 90 91static void 92sta_vattach(struct ieee80211vap *vap) 93{ 94 vap->iv_newstate = sta_newstate; 95 vap->iv_input = sta_input; 96 vap->iv_recv_mgmt = sta_recv_mgmt; 97 vap->iv_recv_ctl = sta_recv_ctl; 98 vap->iv_opdetach = sta_vdetach; 99 vap->iv_bmiss = sta_beacon_miss; 100} 101 102/* 103 * Handle a beacon miss event. The common code filters out 104 * spurious events that can happen when scanning and/or before 105 * reaching RUN state. 106 */ 107static void 108sta_beacon_miss(struct ieee80211vap *vap) 109{ 110 KASSERT((vap->iv_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 struct ieee80211com *ic = vap->iv_ic; 137 138 /* 139 * If we receive a beacon miss interrupt when using 140 * dynamic turbo, attempt to switch modes before 141 * reassociating. 142 */ 143 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 144 ieee80211_dturbo_switch(vap, 145 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 146#endif 147 /* 148 * Try to reassociate before scanning for a new ap. 149 */ 150 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 151 } else { 152 /* 153 * Somebody else is controlling state changes (e.g. 154 * a user-mode app) don't do anything that would 155 * confuse them; just drop into scan mode so they'll 156 * notified of the state change and given control. 157 */ 158 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 159 } 160} 161 162/* 163 * Handle deauth with reason. We retry only for 164 * the cases where we might succeed. Otherwise 165 * we downgrade the ap and scan. 166 */ 167static void 168sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 169{ 170 switch (reason) { 171 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 172 case IEEE80211_STATUS_TIMEOUT: 173 case IEEE80211_REASON_ASSOC_EXPIRE: 174 case IEEE80211_REASON_NOT_AUTHED: 175 case IEEE80211_REASON_NOT_ASSOCED: 176 case IEEE80211_REASON_ASSOC_LEAVE: 177 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 178 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 179 break; 180 default: 181 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 182 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 183 ieee80211_check_scan_current(vap); 184 break; 185 } 186} 187 188/* 189 * IEEE80211_M_STA vap state machine handler. 190 * This routine handles the main states in the 802.11 protocol. 191 */ 192static int 193sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 194{ 195 struct ieee80211com *ic = vap->iv_ic; 196 struct ieee80211_node *ni; 197 enum ieee80211_state ostate; 198 199 IEEE80211_LOCK_ASSERT(ic); 200 201 ostate = vap->iv_state; 202 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 203 __func__, ieee80211_state_name[ostate], 204 ieee80211_state_name[nstate], arg); 205 vap->iv_state = nstate; /* state transition */ 206 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 207 if (ostate != IEEE80211_S_SCAN) 208 ieee80211_cancel_scan(vap); /* background scan */ 209 ni = vap->iv_bss; /* NB: no reference held */ 210 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 211 callout_stop(&vap->iv_swbmiss); 212 switch (nstate) { 213 case IEEE80211_S_INIT: 214 switch (ostate) { 215 case IEEE80211_S_SLEEP: 216 /* XXX wakeup */ 217 case IEEE80211_S_RUN: 218 IEEE80211_SEND_MGMT(ni, 219 IEEE80211_FC0_SUBTYPE_DISASSOC, 220 IEEE80211_REASON_ASSOC_LEAVE); 221 ieee80211_sta_leave(ni); 222 break; 223 case IEEE80211_S_ASSOC: 224 IEEE80211_SEND_MGMT(ni, 225 IEEE80211_FC0_SUBTYPE_DEAUTH, 226 IEEE80211_REASON_AUTH_LEAVE); 227 break; 228 case IEEE80211_S_SCAN: 229 ieee80211_cancel_scan(vap); 230 break; 231 default: 232 goto invalid; 233 } 234 if (ostate != IEEE80211_S_INIT) { 235 /* NB: optimize INIT -> INIT case */ 236 ieee80211_reset_bss(vap); 237 } 238 if (vap->iv_auth->ia_detach != NULL) 239 vap->iv_auth->ia_detach(vap); 240 break; 241 case IEEE80211_S_SCAN: 242 switch (ostate) { 243 case IEEE80211_S_INIT: 244 /* 245 * Initiate a scan. We can come here as a result 246 * of an IEEE80211_IOC_SCAN_REQ too in which case 247 * the vap will be marked with IEEE80211_FEXT_SCANREQ 248 * and the scan request parameters will be present 249 * in iv_scanreq. Otherwise we do the default. 250 */ 251 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 252 ieee80211_check_scan(vap, 253 vap->iv_scanreq_flags, 254 vap->iv_scanreq_duration, 255 vap->iv_scanreq_mindwell, 256 vap->iv_scanreq_maxdwell, 257 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 258 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 259 } else 260 ieee80211_check_scan_current(vap); 261 break; 262 case IEEE80211_S_SCAN: 263 case IEEE80211_S_AUTH: 264 case IEEE80211_S_ASSOC: 265 /* 266 * These can happen either because of a timeout 267 * on an assoc/auth response or because of a 268 * change in state that requires a reset. For 269 * the former we're called with a non-zero arg 270 * that is the cause for the failure; pass this 271 * to the scan code so it can update state. 272 * Otherwise trigger a new scan unless we're in 273 * manual roaming mode in which case an application 274 * must issue an explicit scan request. 275 */ 276 if (arg != 0) 277 ieee80211_scan_assoc_fail(vap, 278 vap->iv_bss->ni_macaddr, arg); 279 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 280 ieee80211_check_scan_current(vap); 281 break; 282 case IEEE80211_S_RUN: /* beacon miss */ 283 /* 284 * Beacon miss. Notify user space and if not 285 * under control of a user application (roaming 286 * manual) kick off a scan to re-connect. 287 */ 288 ieee80211_sta_leave(ni); 289 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 290 ieee80211_check_scan_current(vap); 291 break; 292 default: 293 goto invalid; 294 } 295 break; 296 case IEEE80211_S_AUTH: 297 switch (ostate) { 298 case IEEE80211_S_INIT: 299 case IEEE80211_S_SCAN: 300 IEEE80211_SEND_MGMT(ni, 301 IEEE80211_FC0_SUBTYPE_AUTH, 1); 302 break; 303 case IEEE80211_S_AUTH: 304 case IEEE80211_S_ASSOC: 305 switch (arg & 0xff) { 306 case IEEE80211_FC0_SUBTYPE_AUTH: 307 /* ??? */ 308 IEEE80211_SEND_MGMT(ni, 309 IEEE80211_FC0_SUBTYPE_AUTH, 2); 310 break; 311 case IEEE80211_FC0_SUBTYPE_DEAUTH: 312 sta_authretry(vap, ni, arg>>8); 313 break; 314 } 315 break; 316 case IEEE80211_S_RUN: 317 switch (arg & 0xff) { 318 case IEEE80211_FC0_SUBTYPE_AUTH: 319 IEEE80211_SEND_MGMT(ni, 320 IEEE80211_FC0_SUBTYPE_AUTH, 2); 321 vap->iv_state = ostate; /* stay RUN */ 322 break; 323 case IEEE80211_FC0_SUBTYPE_DEAUTH: 324 ieee80211_sta_leave(ni); 325 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 326 /* try to reauth */ 327 IEEE80211_SEND_MGMT(ni, 328 IEEE80211_FC0_SUBTYPE_AUTH, 1); 329 } 330 break; 331 } 332 break; 333 default: 334 goto invalid; 335 } 336 break; 337 case IEEE80211_S_ASSOC: 338 switch (ostate) { 339 case IEEE80211_S_AUTH: 340 case IEEE80211_S_ASSOC: 341 IEEE80211_SEND_MGMT(ni, 342 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 343 break; 344 case IEEE80211_S_SLEEP: /* cannot happen */ 345 case IEEE80211_S_RUN: 346 ieee80211_sta_leave(ni); 347 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 348 IEEE80211_SEND_MGMT(ni, arg ? 349 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 350 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 351 } 352 break; 353 default: 354 goto invalid; 355 } 356 break; 357 case IEEE80211_S_RUN: 358 if (vap->iv_flags & IEEE80211_F_WPA) { 359 /* XXX validate prerequisites */ 360 } 361 switch (ostate) { 362 case IEEE80211_S_RUN: 363 break; 364 case IEEE80211_S_AUTH: /* when join is done in fw */ 365 case IEEE80211_S_ASSOC: 366#ifdef IEEE80211_DEBUG 367 if (ieee80211_msg_debug(vap)) { 368 ieee80211_note(vap, "%s with %s ssid ", 369 (vap->iv_opmode == IEEE80211_M_STA ? 370 "associated" : "synchronized"), 371 ether_sprintf(ni->ni_bssid)); 372 ieee80211_print_essid(vap->iv_bss->ni_essid, 373 ni->ni_esslen); 374 /* XXX MCS/HT */ 375 printf(" channel %d start %uMb\n", 376 ieee80211_chan2ieee(ic, ic->ic_curchan), 377 IEEE80211_RATE2MBS(ni->ni_txrate)); 378 } 379#endif 380 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 381 ieee80211_notify_node_join(ni, 382 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 383 break; 384 case IEEE80211_S_SLEEP: 385 ieee80211_sta_pwrsave(vap, 0); 386 break; 387 default: 388 goto invalid; 389 } 390 ieee80211_sync_curchan(ic); 391 if (ostate != IEEE80211_S_RUN && 392 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 393 /* 394 * Start s/w beacon miss timer for devices w/o 395 * hardware support. We fudge a bit here since 396 * we're doing this in software. 397 */ 398 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 399 2 * vap->iv_bmissthreshold * ni->ni_intval); 400 vap->iv_swbmiss_count = 0; 401 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 402 ieee80211_swbmiss, vap); 403 } 404 /* 405 * When 802.1x is not in use mark the port authorized 406 * at this point so traffic can flow. 407 */ 408 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 409 ieee80211_node_authorize(ni); 410 /* 411 * Fake association when joining an existing bss. 412 */ 413 if (ic->ic_newassoc != NULL) 414 ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN); 415 break; 416 case IEEE80211_S_SLEEP: 417 ieee80211_sta_pwrsave(vap, 0); 418 break; 419 default: 420 invalid: 421 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 422 "%s: unexpected state transition %s -> %s\n", __func__, 423 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 424 break; 425 } 426 return 0; 427} 428 429/* 430 * Return non-zero if the frame is an echo of a multicast 431 * frame sent by ourself. The dir is known to be DSTODS. 432 */ 433static __inline int 434isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 435{ 436#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 437#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 438 const uint8_t *sa; 439 440 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 441 442 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 443 return 0; 444 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 445 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 446#undef WH4 447#undef QWH4 448} 449 450/* 451 * Return non-zero if the frame is an echo of a multicast 452 * frame sent by ourself. The dir is known to be FROMDS. 453 */ 454static __inline int 455isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 456{ 457 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 458 459 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 460 return 0; 461 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 462} 463 464/* 465 * Decide if a received management frame should be 466 * printed when debugging is enabled. This filters some 467 * of the less interesting frames that come frequently 468 * (e.g. beacons). 469 */ 470static __inline int 471doprint(struct ieee80211vap *vap, int subtype) 472{ 473 switch (subtype) { 474 case IEEE80211_FC0_SUBTYPE_BEACON: 475 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 476 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 477 return 0; 478 } 479 return 1; 480} 481 482/* 483 * Process a received frame. The node associated with the sender 484 * should be supplied. If nothing was found in the node table then 485 * the caller is assumed to supply a reference to iv_bss instead. 486 * The RSSI and a timestamp are also supplied. The RSSI data is used 487 * during AP scanning to select a AP to associate with; it can have 488 * any units so long as values have consistent units and higher values 489 * mean ``better signal''. The receive timestamp is currently not used 490 * by the 802.11 layer. 491 */ 492static int 493sta_input(struct ieee80211_node *ni, struct mbuf *m, 494 int rssi, int noise, uint32_t rstamp) 495{ 496#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 497#define HAS_SEQ(type) ((type & 0x4) == 0) 498 struct ieee80211vap *vap = ni->ni_vap; 499 struct ieee80211com *ic = ni->ni_ic; 500 struct ifnet *ifp = vap->iv_ifp; 501 struct ieee80211_frame *wh; 502 struct ieee80211_key *key; 503 struct ether_header *eh; 504 int hdrspace, need_tap; 505 uint8_t dir, type, subtype, qos; 506 uint8_t *bssid; 507 uint16_t rxseq; 508 509 if (m->m_flags & M_AMPDU_MPDU) { 510 /* 511 * Fastpath for A-MPDU reorder q resubmission. Frames 512 * w/ M_AMPDU_MPDU marked have already passed through 513 * here but were received out of order and been held on 514 * the reorder queue. When resubmitted they are marked 515 * with the M_AMPDU_MPDU flag and we can bypass most of 516 * the normal processing. 517 */ 518 wh = mtod(m, struct ieee80211_frame *); 519 type = IEEE80211_FC0_TYPE_DATA; 520 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 521 subtype = IEEE80211_FC0_SUBTYPE_QOS; 522 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 523 goto resubmit_ampdu; 524 } 525 526 KASSERT(ni != NULL, ("null node")); 527 ni->ni_inact = ni->ni_inact_reload; 528 529 need_tap = 1; /* mbuf need to be tapped. */ 530 type = -1; /* undefined */ 531 532 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 533 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 534 ni->ni_macaddr, NULL, 535 "too short (1): len %u", m->m_pkthdr.len); 536 vap->iv_stats.is_rx_tooshort++; 537 goto out; 538 } 539 /* 540 * Bit of a cheat here, we use a pointer for a 3-address 541 * frame format but don't reference fields past outside 542 * ieee80211_frame_min w/o first validating the data is 543 * present. 544 */ 545 wh = mtod(m, struct ieee80211_frame *); 546 547 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 548 IEEE80211_FC0_VERSION_0) { 549 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 550 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 551 vap->iv_stats.is_rx_badversion++; 552 goto err; 553 } 554 555 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 556 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 557 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 558 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 559 bssid = wh->i_addr2; 560 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 561 /* not interested in */ 562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 563 bssid, NULL, "%s", "not to bss"); 564 vap->iv_stats.is_rx_wrongbss++; 565 goto out; 566 } 567 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 568 ni->ni_noise = noise; 569 ni->ni_rstamp = rstamp; 570 if (HAS_SEQ(type)) { 571 uint8_t tid = ieee80211_gettid(wh); 572 if (IEEE80211_QOS_HAS_SEQ(wh) && 573 TID_TO_WME_AC(tid) >= WME_AC_VI) 574 ic->ic_wme.wme_hipri_traffic++; 575 rxseq = le16toh(*(uint16_t *)wh->i_seq); 576 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 577 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 578 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 579 /* duplicate, discard */ 580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 581 bssid, "duplicate", 582 "seqno <%u,%u> fragno <%u,%u> tid %u", 583 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 584 ni->ni_rxseqs[tid] >> 585 IEEE80211_SEQ_SEQ_SHIFT, 586 rxseq & IEEE80211_SEQ_FRAG_MASK, 587 ni->ni_rxseqs[tid] & 588 IEEE80211_SEQ_FRAG_MASK, 589 tid); 590 vap->iv_stats.is_rx_dup++; 591 IEEE80211_NODE_STAT(ni, rx_dup); 592 goto out; 593 } 594 ni->ni_rxseqs[tid] = rxseq; 595 } 596 } 597 598 switch (type) { 599 case IEEE80211_FC0_TYPE_DATA: 600 hdrspace = ieee80211_hdrspace(ic, wh); 601 if (m->m_len < hdrspace && 602 (m = m_pullup(m, hdrspace)) == NULL) { 603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 604 ni->ni_macaddr, NULL, 605 "data too short: expecting %u", hdrspace); 606 vap->iv_stats.is_rx_tooshort++; 607 goto out; /* XXX */ 608 } 609 /* 610 * Handle A-MPDU re-ordering. If the frame is to be 611 * processed directly then ieee80211_ampdu_reorder 612 * will return 0; otherwise it has consumed the mbuf 613 * and we should do nothing more with it. 614 */ 615 if ((m->m_flags & M_AMPDU) && 616 (dir == IEEE80211_FC1_DIR_FROMDS || 617 dir == IEEE80211_FC1_DIR_DSTODS) && 618 ieee80211_ampdu_reorder(ni, m) != 0) { 619 m = NULL; 620 goto out; 621 } 622 resubmit_ampdu: 623 if (dir == IEEE80211_FC1_DIR_FROMDS) { 624 if ((ifp->if_flags & IFF_SIMPLEX) && 625 isfromds_mcastecho(vap, wh)) { 626 /* 627 * In IEEE802.11 network, multicast 628 * packets sent from "me" are broadcast 629 * from the AP; silently discard for 630 * SIMPLEX interface. 631 */ 632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 633 wh, "data", "%s", "multicast echo"); 634 vap->iv_stats.is_rx_mcastecho++; 635 goto out; 636 } 637 if ((vap->iv_flags & IEEE80211_F_DWDS) && 638 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 639 /* 640 * DWDS sta's must drop 3-address mcast frames 641 * as they will be sent separately as a 4-addr 642 * frame. Accepting the 3-addr frame will 643 * confuse the bridge into thinking the sending 644 * sta is located at the end of WDS link. 645 */ 646 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 647 "3-address data", "%s", "DWDS enabled"); 648 vap->iv_stats.is_rx_mcastecho++; 649 goto out; 650 } 651 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 652 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 653 IEEE80211_DISCARD(vap, 654 IEEE80211_MSG_INPUT, wh, "4-address data", 655 "%s", "DWDS not enabled"); 656 vap->iv_stats.is_rx_wrongdir++; 657 goto out; 658 } 659 if ((ifp->if_flags & IFF_SIMPLEX) && 660 isdstods_mcastecho(vap, wh)) { 661 /* 662 * In IEEE802.11 network, multicast 663 * packets sent from "me" are broadcast 664 * from the AP; silently discard for 665 * SIMPLEX interface. 666 */ 667 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 668 "4-address data", "%s", "multicast echo"); 669 vap->iv_stats.is_rx_mcastecho++; 670 goto out; 671 } 672 } else { 673 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 674 "data", "incorrect dir 0x%x", dir); 675 vap->iv_stats.is_rx_wrongdir++; 676 goto out; 677 } 678 679 /* 680 * Handle privacy requirements. Note that we 681 * must not be preempted from here until after 682 * we (potentially) call ieee80211_crypto_demic; 683 * otherwise we may violate assumptions in the 684 * crypto cipher modules used to do delayed update 685 * of replay sequence numbers. 686 */ 687 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 688 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 689 /* 690 * Discard encrypted frames when privacy is off. 691 */ 692 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 693 wh, "WEP", "%s", "PRIVACY off"); 694 vap->iv_stats.is_rx_noprivacy++; 695 IEEE80211_NODE_STAT(ni, rx_noprivacy); 696 goto out; 697 } 698 key = ieee80211_crypto_decap(ni, m, hdrspace); 699 if (key == NULL) { 700 /* NB: stats+msgs handled in crypto_decap */ 701 IEEE80211_NODE_STAT(ni, rx_wepfail); 702 goto out; 703 } 704 wh = mtod(m, struct ieee80211_frame *); 705 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 706 } else { 707 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 708 key = NULL; 709 } 710 711 /* 712 * Save QoS bits for use below--before we strip the header. 713 */ 714 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 715 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 716 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 717 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 718 } else 719 qos = 0; 720 721 /* 722 * Next up, any fragmentation. 723 */ 724 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 725 m = ieee80211_defrag(ni, m, hdrspace); 726 if (m == NULL) { 727 /* Fragment dropped or frame not complete yet */ 728 goto out; 729 } 730 } 731 wh = NULL; /* no longer valid, catch any uses */ 732 733 /* 734 * Next strip any MSDU crypto bits. 735 */ 736 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 737 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 738 ni->ni_macaddr, "data", "%s", "demic error"); 739 vap->iv_stats.is_rx_demicfail++; 740 IEEE80211_NODE_STAT(ni, rx_demicfail); 741 goto out; 742 } 743 744 /* copy to listener after decrypt */ 745 if (bpf_peers_present(vap->iv_rawbpf)) 746 bpf_mtap(vap->iv_rawbpf, m); 747 need_tap = 0; 748 749 /* 750 * Finally, strip the 802.11 header. 751 */ 752 m = ieee80211_decap(vap, m, hdrspace); 753 if (m == NULL) { 754 /* XXX mask bit to check for both */ 755 /* don't count Null data frames as errors */ 756 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 757 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 758 goto out; 759 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 760 ni->ni_macaddr, "data", "%s", "decap error"); 761 vap->iv_stats.is_rx_decap++; 762 IEEE80211_NODE_STAT(ni, rx_decap); 763 goto err; 764 } 765 eh = mtod(m, struct ether_header *); 766 if (!ieee80211_node_is_authorized(ni)) { 767 /* 768 * Deny any non-PAE frames received prior to 769 * authorization. For open/shared-key 770 * authentication the port is mark authorized 771 * after authentication completes. For 802.1x 772 * the port is not marked authorized by the 773 * authenticator until the handshake has completed. 774 */ 775 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 776 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 777 eh->ether_shost, "data", 778 "unauthorized port: ether type 0x%x len %u", 779 eh->ether_type, m->m_pkthdr.len); 780 vap->iv_stats.is_rx_unauth++; 781 IEEE80211_NODE_STAT(ni, rx_unauth); 782 goto err; 783 } 784 } else { 785 /* 786 * When denying unencrypted frames, discard 787 * any non-PAE frames received without encryption. 788 */ 789 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 790 (key == NULL && (m->m_flags & M_WEP) == 0) && 791 eh->ether_type != htons(ETHERTYPE_PAE)) { 792 /* 793 * Drop unencrypted frames. 794 */ 795 vap->iv_stats.is_rx_unencrypted++; 796 IEEE80211_NODE_STAT(ni, rx_unencrypted); 797 goto out; 798 } 799 } 800 /* XXX require HT? */ 801 if (qos & IEEE80211_QOS_AMSDU) { 802 m = ieee80211_decap_amsdu(ni, m); 803 if (m == NULL) 804 return IEEE80211_FC0_TYPE_DATA; 805 } else { 806#ifdef IEEE80211_SUPPORT_SUPERG 807 m = ieee80211_decap_fastframe(vap, ni, m); 808 if (m == NULL) 809 return IEEE80211_FC0_TYPE_DATA; 810#endif 811 } 812 ieee80211_deliver_data(vap, ni, m); 813 return IEEE80211_FC0_TYPE_DATA; 814 815 case IEEE80211_FC0_TYPE_MGT: 816 vap->iv_stats.is_rx_mgmt++; 817 IEEE80211_NODE_STAT(ni, rx_mgmt); 818 if (dir != IEEE80211_FC1_DIR_NODS) { 819 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 820 wh, "data", "incorrect dir 0x%x", dir); 821 vap->iv_stats.is_rx_wrongdir++; 822 goto err; 823 } 824 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 825 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 826 ni->ni_macaddr, "mgt", "too short: len %u", 827 m->m_pkthdr.len); 828 vap->iv_stats.is_rx_tooshort++; 829 goto out; 830 } 831#ifdef IEEE80211_DEBUG 832 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 833 ieee80211_msg_dumppkts(vap)) { 834 if_printf(ifp, "received %s from %s rssi %d\n", 835 ieee80211_mgt_subtype_name[subtype >> 836 IEEE80211_FC0_SUBTYPE_SHIFT], 837 ether_sprintf(wh->i_addr2), rssi); 838 } 839#endif 840 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 841 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 842 /* 843 * Only shared key auth frames with a challenge 844 * should be encrypted, discard all others. 845 */ 846 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 847 wh, ieee80211_mgt_subtype_name[subtype >> 848 IEEE80211_FC0_SUBTYPE_SHIFT], 849 "%s", "WEP set but not permitted"); 850 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 851 goto out; 852 } 853 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 854 /* 855 * Discard encrypted frames when privacy is off. 856 */ 857 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 858 wh, "mgt", "%s", "WEP set but PRIVACY off"); 859 vap->iv_stats.is_rx_noprivacy++; 860 goto out; 861 } 862 hdrspace = ieee80211_hdrspace(ic, wh); 863 key = ieee80211_crypto_decap(ni, m, hdrspace); 864 if (key == NULL) { 865 /* NB: stats+msgs handled in crypto_decap */ 866 goto out; 867 } 868 wh = mtod(m, struct ieee80211_frame *); 869 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 870 } 871 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 872 goto out; 873 874 case IEEE80211_FC0_TYPE_CTL: 875 vap->iv_stats.is_rx_ctl++; 876 IEEE80211_NODE_STAT(ni, rx_ctrl); 877 vap->iv_recv_ctl(ni, m, subtype); 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 (need_tap && bpf_peers_present(vap->iv_rawbpf)) 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) 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 } else { 1463#ifdef IEEE80211_SUPPORT_SUPERG 1464 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1465 ieee80211_ff_node_init(ni); 1466#endif 1467 } 1468 /* 1469 * Configure state now that we are associated. 1470 * 1471 * XXX may need different/additional driver callbacks? 1472 */ 1473 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1474 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1475 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1476 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1477 } else { 1478 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1479 ic->ic_flags |= IEEE80211_F_USEBARKER; 1480 } 1481 ieee80211_set_shortslottime(ic, 1482 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1483 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1484 /* 1485 * Honor ERP protection. 1486 * 1487 * NB: ni_erp should zero for non-11g operation. 1488 */ 1489 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1490 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1491 ic->ic_flags |= IEEE80211_F_USEPROT; 1492 else 1493 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1494 IEEE80211_NOTE_MAC(vap, 1495 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1496 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1497 ISREASSOC(subtype) ? "re" : "", 1498 IEEE80211_NODE_AID(ni), 1499 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1500 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1501 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1502 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1503 ni->ni_flags & IEEE80211_NODE_HT ? 1504 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1505 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1506 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1507 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1508 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1509 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1510 ", fast-frames" : "", 1511 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1512 ", turbo" : "" 1513 ); 1514 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1515 break; 1516 } 1517 1518 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1519 uint16_t reason; 1520 1521 if (vap->iv_state == IEEE80211_S_SCAN) { 1522 vap->iv_stats.is_rx_mgtdiscard++; 1523 return; 1524 } 1525 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1526 /* NB: can happen when in promiscuous mode */ 1527 vap->iv_stats.is_rx_mgtdiscard++; 1528 break; 1529 } 1530 1531 /* 1532 * deauth frame format 1533 * [2] reason 1534 */ 1535 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1536 reason = le16toh(*(uint16_t *)frm); 1537 1538 vap->iv_stats.is_rx_deauth++; 1539 vap->iv_stats.is_rx_deauth_code = reason; 1540 IEEE80211_NODE_STAT(ni, rx_deauth); 1541 1542 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1543 "recv deauthenticate (reason %d)", reason); 1544 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1545 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1546 break; 1547 } 1548 1549 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1550 uint16_t reason; 1551 1552 if (vap->iv_state != IEEE80211_S_RUN && 1553 vap->iv_state != IEEE80211_S_ASSOC && 1554 vap->iv_state != IEEE80211_S_AUTH) { 1555 vap->iv_stats.is_rx_mgtdiscard++; 1556 return; 1557 } 1558 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1559 /* NB: can happen when in promiscuous mode */ 1560 vap->iv_stats.is_rx_mgtdiscard++; 1561 break; 1562 } 1563 1564 /* 1565 * disassoc frame format 1566 * [2] reason 1567 */ 1568 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1569 reason = le16toh(*(uint16_t *)frm); 1570 1571 vap->iv_stats.is_rx_disassoc++; 1572 vap->iv_stats.is_rx_disassoc_code = reason; 1573 IEEE80211_NODE_STAT(ni, rx_disassoc); 1574 1575 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1576 "recv disassociate (reason %d)", reason); 1577 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1578 break; 1579 } 1580 1581 case IEEE80211_FC0_SUBTYPE_ACTION: 1582 if (vap->iv_state == IEEE80211_S_RUN) { 1583 if (ieee80211_parse_action(ni, m0) == 0) 1584 ic->ic_recv_action(ni, frm, efrm); 1585 } else 1586 vap->iv_stats.is_rx_mgtdiscard++; 1587 break; 1588 1589 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1590 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1591 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1592 vap->iv_stats.is_rx_mgtdiscard++; 1593 return; 1594 default: 1595 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1596 wh, "mgt", "subtype 0x%x not handled", subtype); 1597 vap->iv_stats.is_rx_badsubtype++; 1598 break; 1599 } 1600#undef ISREASSOC 1601#undef ISPROBE 1602} 1603 1604static void 1605sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1606{ 1607} 1608