ieee80211_sta.c revision 191549
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 191549 2009-04-26 22:44:23Z 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, fc %02x:%02x", 551 wh->i_fc[0], wh->i_fc[1]); 552 vap->iv_stats.is_rx_badversion++; 553 goto err; 554 } 555 556 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 557 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 558 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 559 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 560 bssid = wh->i_addr2; 561 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 562 /* not interested in */ 563 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 564 bssid, NULL, "%s", "not to bss"); 565 vap->iv_stats.is_rx_wrongbss++; 566 goto out; 567 } 568 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 569 ni->ni_noise = noise; 570 ni->ni_rstamp = rstamp; 571 if (HAS_SEQ(type)) { 572 uint8_t tid = ieee80211_gettid(wh); 573 if (IEEE80211_QOS_HAS_SEQ(wh) && 574 TID_TO_WME_AC(tid) >= WME_AC_VI) 575 ic->ic_wme.wme_hipri_traffic++; 576 rxseq = le16toh(*(uint16_t *)wh->i_seq); 577 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 578 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 579 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 580 /* duplicate, discard */ 581 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 582 bssid, "duplicate", 583 "seqno <%u,%u> fragno <%u,%u> tid %u", 584 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 585 ni->ni_rxseqs[tid] >> 586 IEEE80211_SEQ_SEQ_SHIFT, 587 rxseq & IEEE80211_SEQ_FRAG_MASK, 588 ni->ni_rxseqs[tid] & 589 IEEE80211_SEQ_FRAG_MASK, 590 tid); 591 vap->iv_stats.is_rx_dup++; 592 IEEE80211_NODE_STAT(ni, rx_dup); 593 goto out; 594 } 595 ni->ni_rxseqs[tid] = rxseq; 596 } 597 } 598 599 switch (type) { 600 case IEEE80211_FC0_TYPE_DATA: 601 hdrspace = ieee80211_hdrspace(ic, wh); 602 if (m->m_len < hdrspace && 603 (m = m_pullup(m, hdrspace)) == NULL) { 604 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 605 ni->ni_macaddr, NULL, 606 "data too short: expecting %u", hdrspace); 607 vap->iv_stats.is_rx_tooshort++; 608 goto out; /* XXX */ 609 } 610 /* 611 * Handle A-MPDU re-ordering. If the frame is to be 612 * processed directly then ieee80211_ampdu_reorder 613 * will return 0; otherwise it has consumed the mbuf 614 * and we should do nothing more with it. 615 */ 616 if ((m->m_flags & M_AMPDU) && 617 (dir == IEEE80211_FC1_DIR_FROMDS || 618 dir == IEEE80211_FC1_DIR_DSTODS) && 619 ieee80211_ampdu_reorder(ni, m) != 0) { 620 m = NULL; 621 goto out; 622 } 623 resubmit_ampdu: 624 if (dir == IEEE80211_FC1_DIR_FROMDS) { 625 if ((ifp->if_flags & IFF_SIMPLEX) && 626 isfromds_mcastecho(vap, wh)) { 627 /* 628 * In IEEE802.11 network, multicast 629 * packets sent from "me" are broadcast 630 * from the AP; silently discard for 631 * SIMPLEX interface. 632 */ 633 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 634 wh, "data", "%s", "multicast echo"); 635 vap->iv_stats.is_rx_mcastecho++; 636 goto out; 637 } 638 if ((vap->iv_flags & IEEE80211_F_DWDS) && 639 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 640 /* 641 * DWDS sta's must drop 3-address mcast frames 642 * as they will be sent separately as a 4-addr 643 * frame. Accepting the 3-addr frame will 644 * confuse the bridge into thinking the sending 645 * sta is located at the end of WDS link. 646 */ 647 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 648 "3-address data", "%s", "DWDS enabled"); 649 vap->iv_stats.is_rx_mcastecho++; 650 goto out; 651 } 652 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 653 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 654 IEEE80211_DISCARD(vap, 655 IEEE80211_MSG_INPUT, wh, "4-address data", 656 "%s", "DWDS not enabled"); 657 vap->iv_stats.is_rx_wrongdir++; 658 goto out; 659 } 660 if ((ifp->if_flags & IFF_SIMPLEX) && 661 isdstods_mcastecho(vap, wh)) { 662 /* 663 * In IEEE802.11 network, multicast 664 * packets sent from "me" are broadcast 665 * from the AP; silently discard for 666 * SIMPLEX interface. 667 */ 668 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 669 "4-address data", "%s", "multicast echo"); 670 vap->iv_stats.is_rx_mcastecho++; 671 goto out; 672 } 673 } else { 674 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 675 "data", "incorrect dir 0x%x", dir); 676 vap->iv_stats.is_rx_wrongdir++; 677 goto out; 678 } 679 680 /* 681 * Handle privacy requirements. Note that we 682 * must not be preempted from here until after 683 * we (potentially) call ieee80211_crypto_demic; 684 * otherwise we may violate assumptions in the 685 * crypto cipher modules used to do delayed update 686 * of replay sequence numbers. 687 */ 688 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 689 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 690 /* 691 * Discard encrypted frames when privacy is off. 692 */ 693 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 694 wh, "WEP", "%s", "PRIVACY off"); 695 vap->iv_stats.is_rx_noprivacy++; 696 IEEE80211_NODE_STAT(ni, rx_noprivacy); 697 goto out; 698 } 699 key = ieee80211_crypto_decap(ni, m, hdrspace); 700 if (key == NULL) { 701 /* NB: stats+msgs handled in crypto_decap */ 702 IEEE80211_NODE_STAT(ni, rx_wepfail); 703 goto out; 704 } 705 wh = mtod(m, struct ieee80211_frame *); 706 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 707 } else { 708 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 709 key = NULL; 710 } 711 712 /* 713 * Save QoS bits for use below--before we strip the header. 714 */ 715 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 716 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 717 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 718 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 719 } else 720 qos = 0; 721 722 /* 723 * Next up, any fragmentation. 724 */ 725 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 726 m = ieee80211_defrag(ni, m, hdrspace); 727 if (m == NULL) { 728 /* Fragment dropped or frame not complete yet */ 729 goto out; 730 } 731 } 732 wh = NULL; /* no longer valid, catch any uses */ 733 734 /* 735 * Next strip any MSDU crypto bits. 736 */ 737 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 738 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 739 ni->ni_macaddr, "data", "%s", "demic error"); 740 vap->iv_stats.is_rx_demicfail++; 741 IEEE80211_NODE_STAT(ni, rx_demicfail); 742 goto out; 743 } 744 745 /* copy to listener after decrypt */ 746 if (bpf_peers_present(vap->iv_rawbpf)) 747 bpf_mtap(vap->iv_rawbpf, m); 748 need_tap = 0; 749 750 /* 751 * Finally, strip the 802.11 header. 752 */ 753 m = ieee80211_decap(vap, m, hdrspace); 754 if (m == NULL) { 755 /* XXX mask bit to check for both */ 756 /* don't count Null data frames as errors */ 757 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 758 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 759 goto out; 760 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 761 ni->ni_macaddr, "data", "%s", "decap error"); 762 vap->iv_stats.is_rx_decap++; 763 IEEE80211_NODE_STAT(ni, rx_decap); 764 goto err; 765 } 766 eh = mtod(m, struct ether_header *); 767 if (!ieee80211_node_is_authorized(ni)) { 768 /* 769 * Deny any non-PAE frames received prior to 770 * authorization. For open/shared-key 771 * authentication the port is mark authorized 772 * after authentication completes. For 802.1x 773 * the port is not marked authorized by the 774 * authenticator until the handshake has completed. 775 */ 776 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 777 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 778 eh->ether_shost, "data", 779 "unauthorized port: ether type 0x%x len %u", 780 eh->ether_type, m->m_pkthdr.len); 781 vap->iv_stats.is_rx_unauth++; 782 IEEE80211_NODE_STAT(ni, rx_unauth); 783 goto err; 784 } 785 } else { 786 /* 787 * When denying unencrypted frames, discard 788 * any non-PAE frames received without encryption. 789 */ 790 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 791 (key == NULL && (m->m_flags & M_WEP) == 0) && 792 eh->ether_type != htons(ETHERTYPE_PAE)) { 793 /* 794 * Drop unencrypted frames. 795 */ 796 vap->iv_stats.is_rx_unencrypted++; 797 IEEE80211_NODE_STAT(ni, rx_unencrypted); 798 goto out; 799 } 800 } 801 /* XXX require HT? */ 802 if (qos & IEEE80211_QOS_AMSDU) { 803 m = ieee80211_decap_amsdu(ni, m); 804 if (m == NULL) 805 return IEEE80211_FC0_TYPE_DATA; 806 } else { 807#ifdef IEEE80211_SUPPORT_SUPERG 808 m = ieee80211_decap_fastframe(vap, ni, m); 809 if (m == NULL) 810 return IEEE80211_FC0_TYPE_DATA; 811#endif 812 } 813 ieee80211_deliver_data(vap, ni, m); 814 return IEEE80211_FC0_TYPE_DATA; 815 816 case IEEE80211_FC0_TYPE_MGT: 817 vap->iv_stats.is_rx_mgmt++; 818 IEEE80211_NODE_STAT(ni, rx_mgmt); 819 if (dir != IEEE80211_FC1_DIR_NODS) { 820 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 821 wh, "data", "incorrect dir 0x%x", dir); 822 vap->iv_stats.is_rx_wrongdir++; 823 goto err; 824 } 825 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 826 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 827 ni->ni_macaddr, "mgt", "too short: len %u", 828 m->m_pkthdr.len); 829 vap->iv_stats.is_rx_tooshort++; 830 goto out; 831 } 832#ifdef IEEE80211_DEBUG 833 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 834 ieee80211_msg_dumppkts(vap)) { 835 if_printf(ifp, "received %s from %s rssi %d\n", 836 ieee80211_mgt_subtype_name[subtype >> 837 IEEE80211_FC0_SUBTYPE_SHIFT], 838 ether_sprintf(wh->i_addr2), rssi); 839 } 840#endif 841 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 842 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 843 /* 844 * Only shared key auth frames with a challenge 845 * should be encrypted, discard all others. 846 */ 847 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 848 wh, ieee80211_mgt_subtype_name[subtype >> 849 IEEE80211_FC0_SUBTYPE_SHIFT], 850 "%s", "WEP set but not permitted"); 851 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 852 goto out; 853 } 854 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 855 /* 856 * Discard encrypted frames when privacy is off. 857 */ 858 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 859 wh, "mgt", "%s", "WEP set but PRIVACY off"); 860 vap->iv_stats.is_rx_noprivacy++; 861 goto out; 862 } 863 hdrspace = ieee80211_hdrspace(ic, wh); 864 key = ieee80211_crypto_decap(ni, m, hdrspace); 865 if (key == NULL) { 866 /* NB: stats+msgs handled in crypto_decap */ 867 goto out; 868 } 869 wh = mtod(m, struct ieee80211_frame *); 870 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 871 } 872 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 873 goto out; 874 875 case IEEE80211_FC0_TYPE_CTL: 876 vap->iv_stats.is_rx_ctl++; 877 IEEE80211_NODE_STAT(ni, rx_ctrl); 878 vap->iv_recv_ctl(ni, m, subtype); 879 goto out; 880 881 default: 882 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 883 wh, NULL, "bad frame type 0x%x", type); 884 /* should not come here */ 885 break; 886 } 887err: 888 ifp->if_ierrors++; 889out: 890 if (m != NULL) { 891 if (need_tap && bpf_peers_present(vap->iv_rawbpf)) 892 bpf_mtap(vap->iv_rawbpf, m); 893 m_freem(m); 894 } 895 return type; 896#undef SEQ_LEQ 897} 898 899static void 900sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 901 int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) 902{ 903 struct ieee80211vap *vap = ni->ni_vap; 904 905 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 906 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 907 ni->ni_macaddr, "open auth", 908 "bad sta auth mode %u", ni->ni_authmode); 909 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 910 return; 911 } 912 if (vap->iv_state != IEEE80211_S_AUTH || 913 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 914 vap->iv_stats.is_rx_bad_auth++; 915 return; 916 } 917 if (status != 0) { 918 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 919 ni, "open auth failed (reason %d)", status); 920 vap->iv_stats.is_rx_auth_fail++; 921 vap->iv_stats.is_rx_authfail_code = status; 922 ieee80211_new_state(vap, IEEE80211_S_SCAN, 923 IEEE80211_SCAN_FAIL_STATUS); 924 } else 925 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 926} 927 928static void 929sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 930 uint8_t *frm, uint8_t *efrm, int rssi, int noise, uint32_t rstamp, 931 uint16_t seq, uint16_t status) 932{ 933 struct ieee80211vap *vap = ni->ni_vap; 934 uint8_t *challenge; 935 int estatus; 936 937 /* 938 * NB: this can happen as we allow pre-shared key 939 * authentication to be enabled w/o wep being turned 940 * on so that configuration of these can be done 941 * in any order. It may be better to enforce the 942 * ordering in which case this check would just be 943 * for sanity/consistency. 944 */ 945 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 946 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 947 ni->ni_macaddr, "shared key auth", 948 "%s", " PRIVACY is disabled"); 949 estatus = IEEE80211_STATUS_ALG; 950 goto bad; 951 } 952 /* 953 * Pre-shared key authentication is evil; accept 954 * it only if explicitly configured (it is supported 955 * mainly for compatibility with clients like OS X). 956 */ 957 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 958 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 960 ni->ni_macaddr, "shared key auth", 961 "bad sta auth mode %u", ni->ni_authmode); 962 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 963 estatus = IEEE80211_STATUS_ALG; 964 goto bad; 965 } 966 967 challenge = NULL; 968 if (frm + 1 < efrm) { 969 if ((frm[1] + 2) > (efrm - frm)) { 970 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 971 ni->ni_macaddr, "shared key auth", 972 "ie %d/%d too long", 973 frm[0], (frm[1] + 2) - (efrm - frm)); 974 vap->iv_stats.is_rx_bad_auth++; 975 estatus = IEEE80211_STATUS_CHALLENGE; 976 goto bad; 977 } 978 if (*frm == IEEE80211_ELEMID_CHALLENGE) 979 challenge = frm; 980 frm += frm[1] + 2; 981 } 982 switch (seq) { 983 case IEEE80211_AUTH_SHARED_CHALLENGE: 984 case IEEE80211_AUTH_SHARED_RESPONSE: 985 if (challenge == NULL) { 986 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 987 ni->ni_macaddr, "shared key auth", 988 "%s", "no challenge"); 989 vap->iv_stats.is_rx_bad_auth++; 990 estatus = IEEE80211_STATUS_CHALLENGE; 991 goto bad; 992 } 993 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 994 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 995 ni->ni_macaddr, "shared key auth", 996 "bad challenge len %d", challenge[1]); 997 vap->iv_stats.is_rx_bad_auth++; 998 estatus = IEEE80211_STATUS_CHALLENGE; 999 goto bad; 1000 } 1001 default: 1002 break; 1003 } 1004 if (vap->iv_state != IEEE80211_S_AUTH) 1005 return; 1006 switch (seq) { 1007 case IEEE80211_AUTH_SHARED_PASS: 1008 if (ni->ni_challenge != NULL) { 1009 free(ni->ni_challenge, M_80211_NODE); 1010 ni->ni_challenge = NULL; 1011 } 1012 if (status != 0) { 1013 IEEE80211_NOTE_FRAME(vap, 1014 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1015 "shared key auth failed (reason %d)", status); 1016 vap->iv_stats.is_rx_auth_fail++; 1017 vap->iv_stats.is_rx_authfail_code = status; 1018 return; 1019 } 1020 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1021 break; 1022 case IEEE80211_AUTH_SHARED_CHALLENGE: 1023 if (!ieee80211_alloc_challenge(ni)) 1024 return; 1025 /* XXX could optimize by passing recvd challenge */ 1026 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1027 IEEE80211_SEND_MGMT(ni, 1028 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1029 break; 1030 default: 1031 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1032 wh, "shared key auth", "bad seq %d", seq); 1033 vap->iv_stats.is_rx_bad_auth++; 1034 return; 1035 } 1036 return; 1037bad: 1038 /* 1039 * Kick the state machine. This short-circuits 1040 * using the mgt frame timeout to trigger the 1041 * state transition. 1042 */ 1043 if (vap->iv_state == IEEE80211_S_AUTH) 1044 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1045 IEEE80211_SCAN_FAIL_STATUS); 1046} 1047 1048static int 1049ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1050 const struct ieee80211_frame *wh) 1051{ 1052#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1053 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1054 u_int len = frm[1], qosinfo; 1055 int i; 1056 1057 if (len < sizeof(struct ieee80211_wme_param)-2) { 1058 IEEE80211_DISCARD_IE(vap, 1059 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1060 wh, "WME", "too short, len %u", len); 1061 return -1; 1062 } 1063 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1064 qosinfo &= WME_QOSINFO_COUNT; 1065 /* XXX do proper check for wraparound */ 1066 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1067 return 0; 1068 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1069 for (i = 0; i < WME_NUM_AC; i++) { 1070 struct wmeParams *wmep = 1071 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1072 /* NB: ACI not used */ 1073 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1074 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1075 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1076 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1077 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1078 frm += 4; 1079 } 1080 wme->wme_wmeChanParams.cap_info = qosinfo; 1081 return 1; 1082#undef MS 1083} 1084 1085/* 1086 * Return non-zero if a background scan may be continued: 1087 * o bg scan is active 1088 * o no channel switch is pending 1089 * o there has not been any traffic recently 1090 * 1091 * Note we do not check if there is an administrative enable; 1092 * this is only done to start the scan. We assume that any 1093 * change in state will be accompanied by a request to cancel 1094 * active scans which will otherwise cause this test to fail. 1095 */ 1096static __inline int 1097contbgscan(struct ieee80211vap *vap) 1098{ 1099 struct ieee80211com *ic = vap->iv_ic; 1100 1101 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1102 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1103 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1104 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1105} 1106 1107/* 1108 * Return non-zero if a backgrond scan may be started: 1109 * o bg scanning is administratively enabled 1110 * o no channel switch is pending 1111 * o we are not boosted on a dynamic turbo channel 1112 * o there has not been a scan recently 1113 * o there has not been any traffic recently 1114 */ 1115static __inline int 1116startbgscan(struct ieee80211vap *vap) 1117{ 1118 struct ieee80211com *ic = vap->iv_ic; 1119 1120 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1121 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1122#ifdef IEEE80211_SUPPORT_SUPERG 1123 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1124#endif 1125 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1126 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1127} 1128 1129static void 1130sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1131 int subtype, int rssi, int noise, uint32_t rstamp) 1132{ 1133#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1134#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1135 struct ieee80211vap *vap = ni->ni_vap; 1136 struct ieee80211com *ic = ni->ni_ic; 1137 struct ieee80211_frame *wh; 1138 uint8_t *frm, *efrm; 1139 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1140 uint8_t rate; 1141 1142 wh = mtod(m0, struct ieee80211_frame *); 1143 frm = (uint8_t *)&wh[1]; 1144 efrm = mtod(m0, uint8_t *) + m0->m_len; 1145 switch (subtype) { 1146 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1147 case IEEE80211_FC0_SUBTYPE_BEACON: { 1148 struct ieee80211_scanparams scan; 1149 /* 1150 * We process beacon/probe response frames: 1151 * o when scanning, or 1152 * o station mode when associated (to collect state 1153 * updates such as 802.11g slot time) 1154 * Frames otherwise received are discarded. 1155 */ 1156 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1157 vap->iv_stats.is_rx_mgtdiscard++; 1158 return; 1159 } 1160 /* XXX probe response in sta mode when !scanning? */ 1161 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1162 return; 1163 /* 1164 * Count frame now that we know it's to be processed. 1165 */ 1166 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1167 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1168 IEEE80211_NODE_STAT(ni, rx_beacons); 1169 } else 1170 IEEE80211_NODE_STAT(ni, rx_proberesp); 1171 /* 1172 * When operating in station mode, check for state updates. 1173 * Be careful to ignore beacons received while doing a 1174 * background scan. We consider only 11g/WMM stuff right now. 1175 */ 1176 if (ni->ni_associd != 0 && 1177 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1178 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1179 /* record tsf of last beacon */ 1180 memcpy(ni->ni_tstamp.data, scan.tstamp, 1181 sizeof(ni->ni_tstamp)); 1182 /* count beacon frame for s/w bmiss handling */ 1183 vap->iv_swbmiss_count++; 1184 vap->iv_bmiss_count = 0; 1185 if (ni->ni_erp != scan.erp) { 1186 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1187 wh->i_addr2, 1188 "erp change: was 0x%x, now 0x%x", 1189 ni->ni_erp, scan.erp); 1190 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1191 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1192 ic->ic_flags |= IEEE80211_F_USEPROT; 1193 else 1194 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1195 ni->ni_erp = scan.erp; 1196 /* XXX statistic */ 1197 /* XXX driver notification */ 1198 } 1199 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1200 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1201 wh->i_addr2, 1202 "capabilities change: was 0x%x, now 0x%x", 1203 ni->ni_capinfo, scan.capinfo); 1204 /* 1205 * NB: we assume short preamble doesn't 1206 * change dynamically 1207 */ 1208 ieee80211_set_shortslottime(ic, 1209 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1210 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1211 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1212 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1213 /* XXX statistic */ 1214 } 1215 if (scan.wme != NULL && 1216 (ni->ni_flags & IEEE80211_NODE_QOS) && 1217 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1218 ieee80211_wme_updateparams(vap); 1219#ifdef IEEE80211_SUPPORT_SUPERG 1220 if (scan.ath != NULL) 1221 ieee80211_parse_athparams(ni, scan.ath, wh); 1222#endif 1223 if (scan.htcap != NULL && scan.htinfo != NULL && 1224 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1225 ieee80211_ht_updateparams(ni, 1226 scan.htcap, scan.htinfo); 1227 /* XXX state changes? */ 1228 } 1229 if (scan.tim != NULL) { 1230 struct ieee80211_tim_ie *tim = 1231 (struct ieee80211_tim_ie *) scan.tim; 1232#if 0 1233 int aid = IEEE80211_AID(ni->ni_associd); 1234 int ix = aid / NBBY; 1235 int min = tim->tim_bitctl &~ 1; 1236 int max = tim->tim_len + min - 4; 1237 if ((tim->tim_bitctl&1) || 1238 (min <= ix && ix <= max && 1239 isset(tim->tim_bitmap - min, aid))) { 1240 /* 1241 * XXX Do not let bg scan kick off 1242 * we are expecting data. 1243 */ 1244 ic->ic_lastdata = ticks; 1245 ieee80211_sta_pwrsave(vap, 0); 1246 } 1247#endif 1248 ni->ni_dtim_count = tim->tim_count; 1249 ni->ni_dtim_period = tim->tim_period; 1250 } 1251 /* 1252 * If scanning, pass the info to the scan module. 1253 * Otherwise, check if it's the right time to do 1254 * a background scan. Background scanning must 1255 * be enabled and we must not be operating in the 1256 * turbo phase of dynamic turbo mode. Then, 1257 * it's been a while since the last background 1258 * scan and if no data frames have come through 1259 * recently, kick off a scan. Note that this 1260 * is the mechanism by which a background scan 1261 * is started _and_ continued each time we 1262 * return on-channel to receive a beacon from 1263 * our ap. 1264 */ 1265 if (ic->ic_flags & IEEE80211_F_SCAN) { 1266 ieee80211_add_scan(vap, &scan, wh, 1267 subtype, rssi, noise, rstamp); 1268 } else if (contbgscan(vap)) { 1269 ieee80211_bg_scan(vap, 0); 1270 } else if (startbgscan(vap)) { 1271 vap->iv_stats.is_scan_bg++; 1272#if 0 1273 /* wakeup if we are sleeing */ 1274 ieee80211_set_pwrsave(vap, 0); 1275#endif 1276 ieee80211_bg_scan(vap, 0); 1277 } 1278 return; 1279 } 1280 /* 1281 * If scanning, just pass information to the scan module. 1282 */ 1283 if (ic->ic_flags & IEEE80211_F_SCAN) { 1284 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1285 /* 1286 * Actively scanning a channel marked passive; 1287 * send a probe request now that we know there 1288 * is 802.11 traffic present. 1289 * 1290 * XXX check if the beacon we recv'd gives 1291 * us what we need and suppress the probe req 1292 */ 1293 ieee80211_probe_curchan(vap, 1); 1294 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1295 } 1296 ieee80211_add_scan(vap, &scan, wh, 1297 subtype, rssi, noise, rstamp); 1298 return; 1299 } 1300 break; 1301 } 1302 1303 case IEEE80211_FC0_SUBTYPE_AUTH: { 1304 uint16_t algo, seq, status; 1305 /* 1306 * auth frame format 1307 * [2] algorithm 1308 * [2] sequence 1309 * [2] status 1310 * [tlv*] challenge 1311 */ 1312 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1313 algo = le16toh(*(uint16_t *)frm); 1314 seq = le16toh(*(uint16_t *)(frm + 2)); 1315 status = le16toh(*(uint16_t *)(frm + 4)); 1316 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1317 "recv auth frame with algorithm %d seq %d", algo, seq); 1318 1319 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1320 IEEE80211_DISCARD(vap, 1321 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1322 wh, "auth", "%s", "TKIP countermeasures enabled"); 1323 vap->iv_stats.is_rx_auth_countermeasures++; 1324 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1325 ieee80211_send_error(ni, wh->i_addr2, 1326 IEEE80211_FC0_SUBTYPE_AUTH, 1327 IEEE80211_REASON_MIC_FAILURE); 1328 } 1329 return; 1330 } 1331 if (algo == IEEE80211_AUTH_ALG_SHARED) 1332 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, 1333 noise, rstamp, seq, status); 1334 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1335 sta_auth_open(ni, wh, rssi, noise, rstamp, 1336 seq, status); 1337 else { 1338 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1339 wh, "auth", "unsupported alg %d", algo); 1340 vap->iv_stats.is_rx_auth_unsupported++; 1341 return; 1342 } 1343 break; 1344 } 1345 1346 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1347 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1348 uint16_t capinfo, associd; 1349 uint16_t status; 1350 1351 if (vap->iv_state != IEEE80211_S_ASSOC) { 1352 vap->iv_stats.is_rx_mgtdiscard++; 1353 return; 1354 } 1355 1356 /* 1357 * asresp frame format 1358 * [2] capability information 1359 * [2] status 1360 * [2] association ID 1361 * [tlv] supported rates 1362 * [tlv] extended supported rates 1363 * [tlv] WME 1364 * [tlv] HT capabilities 1365 * [tlv] HT info 1366 */ 1367 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1368 ni = vap->iv_bss; 1369 capinfo = le16toh(*(uint16_t *)frm); 1370 frm += 2; 1371 status = le16toh(*(uint16_t *)frm); 1372 frm += 2; 1373 if (status != 0) { 1374 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1375 wh->i_addr2, "%sassoc failed (reason %d)", 1376 ISREASSOC(subtype) ? "re" : "", status); 1377 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1378 return; 1379 } 1380 associd = le16toh(*(uint16_t *)frm); 1381 frm += 2; 1382 1383 rates = xrates = wme = htcap = htinfo = NULL; 1384 while (efrm - frm > 1) { 1385 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1386 switch (*frm) { 1387 case IEEE80211_ELEMID_RATES: 1388 rates = frm; 1389 break; 1390 case IEEE80211_ELEMID_XRATES: 1391 xrates = frm; 1392 break; 1393 case IEEE80211_ELEMID_HTCAP: 1394 htcap = frm; 1395 break; 1396 case IEEE80211_ELEMID_HTINFO: 1397 htinfo = frm; 1398 break; 1399 case IEEE80211_ELEMID_VENDOR: 1400 if (iswmeoui(frm)) 1401 wme = frm; 1402 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1403 /* 1404 * Accept pre-draft HT ie's if the 1405 * standard ones have not been seen. 1406 */ 1407 if (ishtcapoui(frm)) { 1408 if (htcap == NULL) 1409 htcap = frm; 1410 } else if (ishtinfooui(frm)) { 1411 if (htinfo == NULL) 1412 htcap = frm; 1413 } 1414 } 1415 /* XXX Atheros OUI support */ 1416 break; 1417 } 1418 frm += frm[1] + 2; 1419 } 1420 1421 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1422 if (xrates != NULL) 1423 IEEE80211_VERIFY_ELEMENT(xrates, 1424 IEEE80211_RATE_MAXSIZE - rates[1], return); 1425 rate = ieee80211_setup_rates(ni, rates, xrates, 1426 IEEE80211_F_JOIN | 1427 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1428 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1429 if (rate & IEEE80211_RATE_BASIC) { 1430 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1431 wh->i_addr2, 1432 "%sassoc failed (rate set mismatch)", 1433 ISREASSOC(subtype) ? "re" : ""); 1434 vap->iv_stats.is_rx_assoc_norate++; 1435 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1436 IEEE80211_SCAN_FAIL_STATUS); 1437 return; 1438 } 1439 1440 ni->ni_capinfo = capinfo; 1441 ni->ni_associd = associd; 1442 if (ni->ni_jointime == 0) 1443 ni->ni_jointime = time_uptime; 1444 if (wme != NULL && 1445 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1446 ni->ni_flags |= IEEE80211_NODE_QOS; 1447 ieee80211_wme_updateparams(vap); 1448 } else 1449 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1450 /* 1451 * Setup HT state according to the negotiation. 1452 * 1453 * NB: shouldn't need to check if HT use is enabled but some 1454 * ap's send back HT ie's even when we don't indicate we 1455 * are HT capable in our AssocReq. 1456 */ 1457 if (htcap != NULL && htinfo != NULL && 1458 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1459 ieee80211_ht_node_init(ni); 1460 ieee80211_ht_updateparams(ni, htcap, htinfo); 1461 ieee80211_setup_htrates(ni, htcap, 1462 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1463 ieee80211_setup_basic_htrates(ni, htinfo); 1464 } else { 1465#ifdef IEEE80211_SUPPORT_SUPERG 1466 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH)) 1467 ieee80211_ff_node_init(ni); 1468#endif 1469 } 1470 /* 1471 * Configure state now that we are associated. 1472 * 1473 * XXX may need different/additional driver callbacks? 1474 */ 1475 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1476 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1477 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1478 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1479 } else { 1480 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1481 ic->ic_flags |= IEEE80211_F_USEBARKER; 1482 } 1483 ieee80211_set_shortslottime(ic, 1484 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1485 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1486 /* 1487 * Honor ERP protection. 1488 * 1489 * NB: ni_erp should zero for non-11g operation. 1490 */ 1491 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1492 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1493 ic->ic_flags |= IEEE80211_F_USEPROT; 1494 else 1495 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1496 IEEE80211_NOTE_MAC(vap, 1497 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1498 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1499 ISREASSOC(subtype) ? "re" : "", 1500 IEEE80211_NODE_AID(ni), 1501 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1502 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1503 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1504 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1505 ni->ni_flags & IEEE80211_NODE_HT ? 1506 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1507 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1508 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1509 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1510 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1511 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1512 ", fast-frames" : "", 1513 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1514 ", turbo" : "" 1515 ); 1516 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1517 break; 1518 } 1519 1520 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1521 uint16_t reason; 1522 1523 if (vap->iv_state == IEEE80211_S_SCAN) { 1524 vap->iv_stats.is_rx_mgtdiscard++; 1525 return; 1526 } 1527 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1528 /* NB: can happen when in promiscuous mode */ 1529 vap->iv_stats.is_rx_mgtdiscard++; 1530 break; 1531 } 1532 1533 /* 1534 * deauth frame format 1535 * [2] reason 1536 */ 1537 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1538 reason = le16toh(*(uint16_t *)frm); 1539 1540 vap->iv_stats.is_rx_deauth++; 1541 vap->iv_stats.is_rx_deauth_code = reason; 1542 IEEE80211_NODE_STAT(ni, rx_deauth); 1543 1544 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1545 "recv deauthenticate (reason %d)", reason); 1546 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1547 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1548 break; 1549 } 1550 1551 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1552 uint16_t reason; 1553 1554 if (vap->iv_state != IEEE80211_S_RUN && 1555 vap->iv_state != IEEE80211_S_ASSOC && 1556 vap->iv_state != IEEE80211_S_AUTH) { 1557 vap->iv_stats.is_rx_mgtdiscard++; 1558 return; 1559 } 1560 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1561 /* NB: can happen when in promiscuous mode */ 1562 vap->iv_stats.is_rx_mgtdiscard++; 1563 break; 1564 } 1565 1566 /* 1567 * disassoc frame format 1568 * [2] reason 1569 */ 1570 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1571 reason = le16toh(*(uint16_t *)frm); 1572 1573 vap->iv_stats.is_rx_disassoc++; 1574 vap->iv_stats.is_rx_disassoc_code = reason; 1575 IEEE80211_NODE_STAT(ni, rx_disassoc); 1576 1577 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1578 "recv disassociate (reason %d)", reason); 1579 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1580 break; 1581 } 1582 1583 case IEEE80211_FC0_SUBTYPE_ACTION: 1584 if (vap->iv_state == IEEE80211_S_RUN) { 1585 if (ieee80211_parse_action(ni, m0) == 0) 1586 ic->ic_recv_action(ni, frm, efrm); 1587 } else 1588 vap->iv_stats.is_rx_mgtdiscard++; 1589 break; 1590 1591 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1592 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1593 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1594 vap->iv_stats.is_rx_mgtdiscard++; 1595 return; 1596 default: 1597 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1598 wh, "mgt", "subtype 0x%x not handled", subtype); 1599 vap->iv_stats.is_rx_badsubtype++; 1600 break; 1601 } 1602#undef ISREASSOC 1603#undef ISPROBE 1604} 1605 1606static void 1607sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 1608{ 1609} 1610