ieee80211_sta.c revision 183255
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 183255 2008-09-21 23:59:14Z 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 61#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 62 63static void sta_vattach(struct ieee80211vap *); 64static void sta_beacon_miss(struct ieee80211vap *); 65static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 66static int sta_input(struct ieee80211_node *, struct mbuf *, 67 int rssi, int noise, uint32_t rstamp); 68static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 69 int subtype, int rssi, int noise, uint32_t rstamp); 70 71void 72ieee80211_sta_attach(struct ieee80211com *ic) 73{ 74 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 75} 76 77void 78ieee80211_sta_detach(struct ieee80211com *ic) 79{ 80} 81 82static void 83sta_vdetach(struct ieee80211vap *vap) 84{ 85} 86 87static void 88sta_vattach(struct ieee80211vap *vap) 89{ 90 vap->iv_newstate = sta_newstate; 91 vap->iv_input = sta_input; 92 vap->iv_recv_mgmt = sta_recv_mgmt; 93 vap->iv_opdetach = sta_vdetach; 94 vap->iv_bmiss = sta_beacon_miss; 95} 96 97/* 98 * Handle a beacon miss event. The common code filters out 99 * spurious events that can happen when scanning and/or before 100 * reaching RUN state. 101 */ 102static void 103sta_beacon_miss(struct ieee80211vap *vap) 104{ 105 struct ieee80211com *ic = vap->iv_ic; 106 107 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 108 KASSERT(vap->iv_state == IEEE80211_S_RUN, 109 ("wrong state %d", vap->iv_state)); 110 111 IEEE80211_DPRINTF(vap, 112 IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 113 "beacon miss, mode %u state %s\n", 114 vap->iv_opmode, ieee80211_state_name[vap->iv_state]); 115 116 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 117 /* 118 * Send a directed probe req before falling back to a 119 * scan; if we receive a response ic_bmiss_count will 120 * be reset. Some cards mistakenly report beacon miss 121 * so this avoids the expensive scan if the ap is 122 * still there. 123 */ 124 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 125 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 126 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 127 return; 128 } 129 vap->iv_bmiss_count = 0; 130 vap->iv_stats.is_beacon_miss++; 131 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 132 /* 133 * If we receive a beacon miss interrupt when using 134 * dynamic turbo, attempt to switch modes before 135 * reassociating. 136 */ 137 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 138 ieee80211_dturbo_switch(vap, 139 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 140 /* 141 * Try to reassociate before scanning for a new ap. 142 */ 143 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 144 } else { 145 /* 146 * Somebody else is controlling state changes (e.g. 147 * a user-mode app) don't do anything that would 148 * confuse them; just drop into scan mode so they'll 149 * notified of the state change and given control. 150 */ 151 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 152 } 153} 154 155/* 156 * Handle deauth with reason. We retry only for 157 * the cases where we might succeed. Otherwise 158 * we downgrade the ap and scan. 159 */ 160static void 161sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 162{ 163 switch (reason) { 164 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 165 case IEEE80211_STATUS_TIMEOUT: 166 case IEEE80211_REASON_ASSOC_EXPIRE: 167 case IEEE80211_REASON_NOT_AUTHED: 168 case IEEE80211_REASON_NOT_ASSOCED: 169 case IEEE80211_REASON_ASSOC_LEAVE: 170 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 171 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 172 break; 173 default: 174 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 175 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 176 ieee80211_check_scan_current(vap); 177 break; 178 } 179} 180 181/* 182 * IEEE80211_M_STA vap state machine handler. 183 * This routine handles the main states in the 802.11 protocol. 184 */ 185static int 186sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 187{ 188 struct ieee80211com *ic = vap->iv_ic; 189 struct ieee80211_node *ni; 190 enum ieee80211_state ostate; 191 192 IEEE80211_LOCK_ASSERT(ic); 193 194 ostate = vap->iv_state; 195 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 196 __func__, ieee80211_state_name[ostate], 197 ieee80211_state_name[nstate], arg); 198 vap->iv_state = nstate; /* state transition */ 199 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 200 if (ostate != IEEE80211_S_SCAN) 201 ieee80211_cancel_scan(vap); /* background scan */ 202 ni = vap->iv_bss; /* NB: no reference held */ 203 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 204 callout_stop(&vap->iv_swbmiss); 205 switch (nstate) { 206 case IEEE80211_S_INIT: 207 switch (ostate) { 208 case IEEE80211_S_SLEEP: 209 /* XXX wakeup */ 210 case IEEE80211_S_RUN: 211 IEEE80211_SEND_MGMT(ni, 212 IEEE80211_FC0_SUBTYPE_DISASSOC, 213 IEEE80211_REASON_ASSOC_LEAVE); 214 ieee80211_sta_leave(ni); 215 break; 216 case IEEE80211_S_ASSOC: 217 IEEE80211_SEND_MGMT(ni, 218 IEEE80211_FC0_SUBTYPE_DEAUTH, 219 IEEE80211_REASON_AUTH_LEAVE); 220 break; 221 case IEEE80211_S_SCAN: 222 ieee80211_cancel_scan(vap); 223 break; 224 default: 225 goto invalid; 226 } 227 if (ostate != IEEE80211_S_INIT) { 228 /* NB: optimize INIT -> INIT case */ 229 ieee80211_reset_bss(vap); 230 } 231 if (vap->iv_auth->ia_detach != NULL) 232 vap->iv_auth->ia_detach(vap); 233 break; 234 case IEEE80211_S_SCAN: 235 switch (ostate) { 236 case IEEE80211_S_INIT: 237 /* 238 * Initiate a scan. We can come here as a result 239 * of an IEEE80211_IOC_SCAN_REQ too in which case 240 * the vap will be marked with IEEE80211_FEXT_SCANREQ 241 * and the scan request parameters will be present 242 * in iv_scanreq. Otherwise we do the default. 243 */ 244 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 245 ieee80211_check_scan(vap, 246 vap->iv_scanreq_flags, 247 vap->iv_scanreq_duration, 248 vap->iv_scanreq_mindwell, 249 vap->iv_scanreq_maxdwell, 250 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 251 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 252 } else 253 ieee80211_check_scan_current(vap); 254 break; 255 case IEEE80211_S_SCAN: 256 case IEEE80211_S_AUTH: 257 case IEEE80211_S_ASSOC: 258 /* 259 * These can happen either because of a timeout 260 * on an assoc/auth response or because of a 261 * change in state that requires a reset. For 262 * the former we're called with a non-zero arg 263 * that is the cause for the failure; pass this 264 * to the scan code so it can update state. 265 * Otherwise trigger a new scan unless we're in 266 * manual roaming mode in which case an application 267 * must issue an explicit scan request. 268 */ 269 if (arg != 0) 270 ieee80211_scan_assoc_fail(vap, 271 vap->iv_bss->ni_macaddr, arg); 272 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 273 ieee80211_check_scan_current(vap); 274 break; 275 case IEEE80211_S_RUN: /* beacon miss */ 276 /* 277 * Beacon miss. Notify user space and if not 278 * under control of a user application (roaming 279 * manual) kick off a scan to re-connect. 280 */ 281 ieee80211_sta_leave(ni); 282 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 283 ieee80211_check_scan_current(vap); 284 break; 285 default: 286 goto invalid; 287 } 288 break; 289 case IEEE80211_S_AUTH: 290 switch (ostate) { 291 case IEEE80211_S_INIT: 292 case IEEE80211_S_SCAN: 293 IEEE80211_SEND_MGMT(ni, 294 IEEE80211_FC0_SUBTYPE_AUTH, 1); 295 break; 296 case IEEE80211_S_AUTH: 297 case IEEE80211_S_ASSOC: 298 switch (arg & 0xff) { 299 case IEEE80211_FC0_SUBTYPE_AUTH: 300 /* ??? */ 301 IEEE80211_SEND_MGMT(ni, 302 IEEE80211_FC0_SUBTYPE_AUTH, 2); 303 break; 304 case IEEE80211_FC0_SUBTYPE_DEAUTH: 305 sta_authretry(vap, ni, arg>>8); 306 break; 307 } 308 break; 309 case IEEE80211_S_RUN: 310 switch (arg & 0xff) { 311 case IEEE80211_FC0_SUBTYPE_AUTH: 312 IEEE80211_SEND_MGMT(ni, 313 IEEE80211_FC0_SUBTYPE_AUTH, 2); 314 vap->iv_state = ostate; /* stay RUN */ 315 break; 316 case IEEE80211_FC0_SUBTYPE_DEAUTH: 317 ieee80211_sta_leave(ni); 318 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 319 /* try to reauth */ 320 IEEE80211_SEND_MGMT(ni, 321 IEEE80211_FC0_SUBTYPE_AUTH, 1); 322 } 323 break; 324 } 325 break; 326 default: 327 goto invalid; 328 } 329 break; 330 case IEEE80211_S_ASSOC: 331 switch (ostate) { 332 case IEEE80211_S_AUTH: 333 case IEEE80211_S_ASSOC: 334 IEEE80211_SEND_MGMT(ni, 335 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 336 break; 337 case IEEE80211_S_SLEEP: /* cannot happen */ 338 case IEEE80211_S_RUN: 339 ieee80211_sta_leave(ni); 340 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 341 IEEE80211_SEND_MGMT(ni, arg ? 342 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 343 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 344 } 345 break; 346 default: 347 goto invalid; 348 } 349 break; 350 case IEEE80211_S_RUN: 351 if (vap->iv_flags & IEEE80211_F_WPA) { 352 /* XXX validate prerequisites */ 353 } 354 switch (ostate) { 355 case IEEE80211_S_RUN: 356 break; 357 case IEEE80211_S_AUTH: /* when join is done in fw */ 358 case IEEE80211_S_ASSOC: 359#ifdef IEEE80211_DEBUG 360 if (ieee80211_msg_debug(vap)) { 361 ieee80211_note(vap, "%s with %s ssid ", 362 (vap->iv_opmode == IEEE80211_M_STA ? 363 "associated" : "synchronized"), 364 ether_sprintf(ni->ni_bssid)); 365 ieee80211_print_essid(vap->iv_bss->ni_essid, 366 ni->ni_esslen); 367 /* XXX MCS/HT */ 368 printf(" channel %d start %uMb\n", 369 ieee80211_chan2ieee(ic, ic->ic_curchan), 370 IEEE80211_RATE2MBS(ni->ni_txrate)); 371 } 372#endif 373 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 374 ieee80211_notify_node_join(ni, 375 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 376 break; 377 case IEEE80211_S_SLEEP: 378 ieee80211_sta_pwrsave(vap, 0); 379 break; 380 default: 381 goto invalid; 382 } 383 ieee80211_sync_curchan(ic); 384 if (ostate != IEEE80211_S_RUN && 385 (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) { 386 /* 387 * Start s/w beacon miss timer for devices w/o 388 * hardware support. We fudge a bit here since 389 * we're doing this in software. 390 */ 391 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 392 2 * vap->iv_bmissthreshold * ni->ni_intval); 393 vap->iv_swbmiss_count = 0; 394 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 395 ieee80211_swbmiss, vap); 396 } 397 /* 398 * When 802.1x is not in use mark the port authorized 399 * at this point so traffic can flow. 400 */ 401 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 402 ieee80211_node_authorize(ni); 403 break; 404 case IEEE80211_S_SLEEP: 405 ieee80211_sta_pwrsave(vap, 0); 406 break; 407 default: 408 invalid: 409 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 410 "%s: invalid state transition %s -> %s\n", __func__, 411 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 412 break; 413 } 414 return 0; 415} 416 417/* 418 * Return non-zero if the frame is an echo of a multicast 419 * frame sent by ourself. The dir is known to be DSTODS. 420 */ 421static __inline int 422isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 423{ 424#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 425#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 426 const uint8_t *sa; 427 428 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 429 430 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 431 return 0; 432 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 433 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 434#undef WH4 435#undef QWH4 436} 437 438/* 439 * Return non-zero if the frame is an echo of a multicast 440 * frame sent by ourself. The dir is known to be FROMDS. 441 */ 442static __inline int 443isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 444{ 445 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 446 447 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 448 return 0; 449 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 450} 451 452/* 453 * Decide if a received management frame should be 454 * printed when debugging is enabled. This filters some 455 * of the less interesting frames that come frequently 456 * (e.g. beacons). 457 */ 458static __inline int 459doprint(struct ieee80211vap *vap, int subtype) 460{ 461 switch (subtype) { 462 case IEEE80211_FC0_SUBTYPE_BEACON: 463 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 464 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 465 return 0; 466 } 467 return 1; 468} 469 470/* 471 * Process a received frame. The node associated with the sender 472 * should be supplied. If nothing was found in the node table then 473 * the caller is assumed to supply a reference to iv_bss instead. 474 * The RSSI and a timestamp are also supplied. The RSSI data is used 475 * during AP scanning to select a AP to associate with; it can have 476 * any units so long as values have consistent units and higher values 477 * mean ``better signal''. The receive timestamp is currently not used 478 * by the 802.11 layer. 479 */ 480static int 481sta_input(struct ieee80211_node *ni, struct mbuf *m, 482 int rssi, int noise, uint32_t rstamp) 483{ 484#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 485#define HAS_SEQ(type) ((type & 0x4) == 0) 486 struct ieee80211vap *vap = ni->ni_vap; 487 struct ieee80211com *ic = ni->ni_ic; 488 struct ifnet *ifp = vap->iv_ifp; 489 struct ieee80211_frame *wh; 490 struct ieee80211_key *key; 491 struct ether_header *eh; 492 int hdrspace, need_tap; 493 uint8_t dir, type, subtype, qos; 494 uint8_t *bssid; 495 uint16_t rxseq; 496 497 if (m->m_flags & M_AMPDU_MPDU) { 498 /* 499 * Fastpath for A-MPDU reorder q resubmission. Frames 500 * w/ M_AMPDU_MPDU marked have already passed through 501 * here but were received out of order and been held on 502 * the reorder queue. When resubmitted they are marked 503 * with the M_AMPDU_MPDU flag and we can bypass most of 504 * the normal processing. 505 */ 506 wh = mtod(m, struct ieee80211_frame *); 507 type = IEEE80211_FC0_TYPE_DATA; 508 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 509 subtype = IEEE80211_FC0_SUBTYPE_QOS; 510 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 511 goto resubmit_ampdu; 512 } 513 514 KASSERT(ni != NULL, ("null node")); 515 ni->ni_inact = ni->ni_inact_reload; 516 517 need_tap = 1; /* mbuf need to be tapped. */ 518 type = -1; /* undefined */ 519 520 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 521 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 522 ni->ni_macaddr, NULL, 523 "too short (1): len %u", m->m_pkthdr.len); 524 vap->iv_stats.is_rx_tooshort++; 525 goto out; 526 } 527 /* 528 * Bit of a cheat here, we use a pointer for a 3-address 529 * frame format but don't reference fields past outside 530 * ieee80211_frame_min w/o first validating the data is 531 * present. 532 */ 533 wh = mtod(m, struct ieee80211_frame *); 534 535 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 536 IEEE80211_FC0_VERSION_0) { 537 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 538 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 539 vap->iv_stats.is_rx_badversion++; 540 goto err; 541 } 542 543 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 544 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 545 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 546 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 547 bssid = wh->i_addr2; 548 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 549 /* not interested in */ 550 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 551 bssid, NULL, "%s", "not to bss"); 552 vap->iv_stats.is_rx_wrongbss++; 553 goto out; 554 } 555 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 556 ni->ni_noise = noise; 557 ni->ni_rstamp = rstamp; 558 if (HAS_SEQ(type)) { 559 uint8_t tid = ieee80211_gettid(wh); 560 if (IEEE80211_QOS_HAS_SEQ(wh) && 561 TID_TO_WME_AC(tid) >= WME_AC_VI) 562 ic->ic_wme.wme_hipri_traffic++; 563 rxseq = le16toh(*(uint16_t *)wh->i_seq); 564 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 565 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 566 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 567 /* duplicate, discard */ 568 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 569 bssid, "duplicate", 570 "seqno <%u,%u> fragno <%u,%u> tid %u", 571 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 572 ni->ni_rxseqs[tid] >> 573 IEEE80211_SEQ_SEQ_SHIFT, 574 rxseq & IEEE80211_SEQ_FRAG_MASK, 575 ni->ni_rxseqs[tid] & 576 IEEE80211_SEQ_FRAG_MASK, 577 tid); 578 vap->iv_stats.is_rx_dup++; 579 IEEE80211_NODE_STAT(ni, rx_dup); 580 goto out; 581 } 582 ni->ni_rxseqs[tid] = rxseq; 583 } 584 } 585 586 switch (type) { 587 case IEEE80211_FC0_TYPE_DATA: 588 hdrspace = ieee80211_hdrspace(ic, wh); 589 if (m->m_len < hdrspace && 590 (m = m_pullup(m, hdrspace)) == NULL) { 591 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 592 ni->ni_macaddr, NULL, 593 "data too short: expecting %u", hdrspace); 594 vap->iv_stats.is_rx_tooshort++; 595 goto out; /* XXX */ 596 } 597 /* 598 * Handle A-MPDU re-ordering. If the frame is to be 599 * processed directly then ieee80211_ampdu_reorder 600 * will return 0; otherwise it has consumed the mbuf 601 * and we should do nothing more with it. 602 */ 603 if ((m->m_flags & M_AMPDU) && 604 (dir == IEEE80211_FC1_DIR_FROMDS || 605 dir == IEEE80211_FC1_DIR_DSTODS) && 606 ieee80211_ampdu_reorder(ni, m) != 0) { 607 m = NULL; 608 goto out; 609 } 610 resubmit_ampdu: 611 if (dir == IEEE80211_FC1_DIR_FROMDS) { 612 if ((ifp->if_flags & IFF_SIMPLEX) && 613 isfromds_mcastecho(vap, wh)) { 614 /* 615 * In IEEE802.11 network, multicast 616 * packets sent from "me" are broadcast 617 * from the AP; silently discard for 618 * SIMPLEX interface. 619 */ 620 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 621 wh, "data", "%s", "multicast echo"); 622 vap->iv_stats.is_rx_mcastecho++; 623 goto out; 624 } 625 if ((vap->iv_flags & IEEE80211_F_DWDS) && 626 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 627 /* 628 * DWDS sta's must drop 3-address mcast frames 629 * as they will be sent separately as a 4-addr 630 * frame. Accepting the 3-addr frame will 631 * confuse the bridge into thinking the sending 632 * sta is located at the end of WDS link. 633 */ 634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 635 "3-address data", "%s", "DWDS enabled"); 636 vap->iv_stats.is_rx_mcastecho++; 637 goto out; 638 } 639 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 640 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 641 IEEE80211_DISCARD(vap, 642 IEEE80211_MSG_INPUT, wh, "4-address data", 643 "%s", "DWDS not enabled"); 644 vap->iv_stats.is_rx_wrongdir++; 645 goto out; 646 } 647 if ((ifp->if_flags & IFF_SIMPLEX) && 648 isdstods_mcastecho(vap, wh)) { 649 /* 650 * In IEEE802.11 network, multicast 651 * packets sent from "me" are broadcast 652 * from the AP; silently discard for 653 * SIMPLEX interface. 654 */ 655 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 656 "4-address data", "%s", "multicast echo"); 657 vap->iv_stats.is_rx_mcastecho++; 658 goto out; 659 } 660 } else { 661 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 662 "data", "incorrect dir 0x%x", dir); 663 vap->iv_stats.is_rx_wrongdir++; 664 goto out; 665 } 666 667 /* 668 * Handle privacy requirements. Note that we 669 * must not be preempted from here until after 670 * we (potentially) call ieee80211_crypto_demic; 671 * otherwise we may violate assumptions in the 672 * crypto cipher modules used to do delayed update 673 * of replay sequence numbers. 674 */ 675 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 676 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 677 /* 678 * Discard encrypted frames when privacy is off. 679 */ 680 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 681 wh, "WEP", "%s", "PRIVACY off"); 682 vap->iv_stats.is_rx_noprivacy++; 683 IEEE80211_NODE_STAT(ni, rx_noprivacy); 684 goto out; 685 } 686 key = ieee80211_crypto_decap(ni, m, hdrspace); 687 if (key == NULL) { 688 /* NB: stats+msgs handled in crypto_decap */ 689 IEEE80211_NODE_STAT(ni, rx_wepfail); 690 goto out; 691 } 692 wh = mtod(m, struct ieee80211_frame *); 693 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 694 } else { 695 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 696 key = NULL; 697 } 698 699 /* 700 * Save QoS bits for use below--before we strip the header. 701 */ 702 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 703 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 704 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 705 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 706 } else 707 qos = 0; 708 709 /* 710 * Next up, any fragmentation. 711 */ 712 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 713 m = ieee80211_defrag(ni, m, hdrspace); 714 if (m == NULL) { 715 /* Fragment dropped or frame not complete yet */ 716 goto out; 717 } 718 } 719 wh = NULL; /* no longer valid, catch any uses */ 720 721 /* 722 * Next strip any MSDU crypto bits. 723 */ 724 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 725 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 726 ni->ni_macaddr, "data", "%s", "demic error"); 727 vap->iv_stats.is_rx_demicfail++; 728 IEEE80211_NODE_STAT(ni, rx_demicfail); 729 goto out; 730 } 731 732 /* copy to listener after decrypt */ 733 if (bpf_peers_present(vap->iv_rawbpf)) 734 bpf_mtap(vap->iv_rawbpf, m); 735 need_tap = 0; 736 737 /* 738 * Finally, strip the 802.11 header. 739 */ 740 m = ieee80211_decap(vap, m, hdrspace); 741 if (m == NULL) { 742 /* XXX mask bit to check for both */ 743 /* don't count Null data frames as errors */ 744 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 745 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 746 goto out; 747 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 748 ni->ni_macaddr, "data", "%s", "decap error"); 749 vap->iv_stats.is_rx_decap++; 750 IEEE80211_NODE_STAT(ni, rx_decap); 751 goto err; 752 } 753 eh = mtod(m, struct ether_header *); 754 if (!ieee80211_node_is_authorized(ni)) { 755 /* 756 * Deny any non-PAE frames received prior to 757 * authorization. For open/shared-key 758 * authentication the port is mark authorized 759 * after authentication completes. For 802.1x 760 * the port is not marked authorized by the 761 * authenticator until the handshake has completed. 762 */ 763 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 765 eh->ether_shost, "data", 766 "unauthorized port: ether type 0x%x len %u", 767 eh->ether_type, m->m_pkthdr.len); 768 vap->iv_stats.is_rx_unauth++; 769 IEEE80211_NODE_STAT(ni, rx_unauth); 770 goto err; 771 } 772 } else { 773 /* 774 * When denying unencrypted frames, discard 775 * any non-PAE frames received without encryption. 776 */ 777 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 778 (key == NULL && (m->m_flags & M_WEP) == 0) && 779 eh->ether_type != htons(ETHERTYPE_PAE)) { 780 /* 781 * Drop unencrypted frames. 782 */ 783 vap->iv_stats.is_rx_unencrypted++; 784 IEEE80211_NODE_STAT(ni, rx_unencrypted); 785 goto out; 786 } 787 } 788 /* XXX require HT? */ 789 if (qos & IEEE80211_QOS_AMSDU) { 790 m = ieee80211_decap_amsdu(ni, m); 791 if (m == NULL) 792 return IEEE80211_FC0_TYPE_DATA; 793 } else if ((ni->ni_ath_flags & IEEE80211_NODE_FF) && 794#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 795 m->m_pkthdr.len >= 3*FF_LLC_SIZE) { 796 struct llc *llc; 797 798 /* 799 * Check for fast-frame tunnel encapsulation. 800 */ 801 if (m->m_len < FF_LLC_SIZE && 802 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 803 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 804 ni->ni_macaddr, "fast-frame", 805 "%s", "m_pullup(llc) failed"); 806 vap->iv_stats.is_rx_tooshort++; 807 return IEEE80211_FC0_TYPE_DATA; 808 } 809 llc = (struct llc *)(mtod(m, uint8_t *) + 810 sizeof(struct ether_header)); 811 if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) { 812 m_adj(m, FF_LLC_SIZE); 813 m = ieee80211_decap_fastframe(ni, m); 814 if (m == NULL) 815 return IEEE80211_FC0_TYPE_DATA; 816 } 817 } 818#undef FF_LLC_SIZE 819 ieee80211_deliver_data(vap, ni, m); 820 return IEEE80211_FC0_TYPE_DATA; 821 822 case IEEE80211_FC0_TYPE_MGT: 823 vap->iv_stats.is_rx_mgmt++; 824 IEEE80211_NODE_STAT(ni, rx_mgmt); 825 if (dir != IEEE80211_FC1_DIR_NODS) { 826 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 827 wh, "data", "incorrect dir 0x%x", dir); 828 vap->iv_stats.is_rx_wrongdir++; 829 goto err; 830 } 831 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 832 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 833 ni->ni_macaddr, "mgt", "too short: len %u", 834 m->m_pkthdr.len); 835 vap->iv_stats.is_rx_tooshort++; 836 goto out; 837 } 838#ifdef IEEE80211_DEBUG 839 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 840 ieee80211_msg_dumppkts(vap)) { 841 if_printf(ifp, "received %s from %s rssi %d\n", 842 ieee80211_mgt_subtype_name[subtype >> 843 IEEE80211_FC0_SUBTYPE_SHIFT], 844 ether_sprintf(wh->i_addr2), rssi); 845 } 846#endif 847 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 848 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 849 /* 850 * Only shared key auth frames with a challenge 851 * should be encrypted, discard all others. 852 */ 853 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 854 wh, ieee80211_mgt_subtype_name[subtype >> 855 IEEE80211_FC0_SUBTYPE_SHIFT], 856 "%s", "WEP set but not permitted"); 857 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 858 goto out; 859 } 860 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 861 /* 862 * Discard encrypted frames when privacy is off. 863 */ 864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 865 wh, "mgt", "%s", "WEP set but PRIVACY off"); 866 vap->iv_stats.is_rx_noprivacy++; 867 goto out; 868 } 869 hdrspace = ieee80211_hdrspace(ic, wh); 870 key = ieee80211_crypto_decap(ni, m, hdrspace); 871 if (key == NULL) { 872 /* NB: stats+msgs handled in crypto_decap */ 873 goto out; 874 } 875 wh = mtod(m, struct ieee80211_frame *); 876 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 877 } 878 if (bpf_peers_present(vap->iv_rawbpf)) 879 bpf_mtap(vap->iv_rawbpf, m); 880 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 881 m_freem(m); 882 return IEEE80211_FC0_TYPE_MGT; 883 884 case IEEE80211_FC0_TYPE_CTL: 885 vap->iv_stats.is_rx_ctl++; 886 IEEE80211_NODE_STAT(ni, rx_ctrl); 887 goto out; 888 default: 889 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 890 wh, NULL, "bad frame type 0x%x", type); 891 /* should not come here */ 892 break; 893 } 894err: 895 ifp->if_ierrors++; 896out: 897 if (m != NULL) { 898 if (bpf_peers_present(vap->iv_rawbpf) && need_tap) 899 bpf_mtap(vap->iv_rawbpf, m); 900 m_freem(m); 901 } 902 return type; 903#undef SEQ_LEQ 904} 905 906static void 907sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 908 int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) 909{ 910 struct ieee80211vap *vap = ni->ni_vap; 911 912 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 913 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 914 ni->ni_macaddr, "open auth", 915 "bad sta auth mode %u", ni->ni_authmode); 916 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 917 return; 918 } 919 if (vap->iv_state != IEEE80211_S_AUTH || 920 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 921 vap->iv_stats.is_rx_bad_auth++; 922 return; 923 } 924 if (status != 0) { 925 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 926 ni, "open auth failed (reason %d)", status); 927 vap->iv_stats.is_rx_auth_fail++; 928 vap->iv_stats.is_rx_authfail_code = status; 929 ieee80211_new_state(vap, IEEE80211_S_SCAN, 930 IEEE80211_SCAN_FAIL_STATUS); 931 } else 932 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 933} 934 935static void 936sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 937 uint8_t *frm, uint8_t *efrm, int rssi, int noise, uint32_t rstamp, 938 uint16_t seq, uint16_t status) 939{ 940 struct ieee80211vap *vap = ni->ni_vap; 941 uint8_t *challenge; 942 int estatus; 943 944 /* 945 * NB: this can happen as we allow pre-shared key 946 * authentication to be enabled w/o wep being turned 947 * on so that configuration of these can be done 948 * in any order. It may be better to enforce the 949 * ordering in which case this check would just be 950 * for sanity/consistency. 951 */ 952 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 953 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 954 ni->ni_macaddr, "shared key auth", 955 "%s", " PRIVACY is disabled"); 956 estatus = IEEE80211_STATUS_ALG; 957 goto bad; 958 } 959 /* 960 * Pre-shared key authentication is evil; accept 961 * it only if explicitly configured (it is supported 962 * mainly for compatibility with clients like OS X). 963 */ 964 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 965 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 966 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 967 ni->ni_macaddr, "shared key auth", 968 "bad sta auth mode %u", ni->ni_authmode); 969 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 970 estatus = IEEE80211_STATUS_ALG; 971 goto bad; 972 } 973 974 challenge = NULL; 975 if (frm + 1 < efrm) { 976 if ((frm[1] + 2) > (efrm - frm)) { 977 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 978 ni->ni_macaddr, "shared key auth", 979 "ie %d/%d too long", 980 frm[0], (frm[1] + 2) - (efrm - frm)); 981 vap->iv_stats.is_rx_bad_auth++; 982 estatus = IEEE80211_STATUS_CHALLENGE; 983 goto bad; 984 } 985 if (*frm == IEEE80211_ELEMID_CHALLENGE) 986 challenge = frm; 987 frm += frm[1] + 2; 988 } 989 switch (seq) { 990 case IEEE80211_AUTH_SHARED_CHALLENGE: 991 case IEEE80211_AUTH_SHARED_RESPONSE: 992 if (challenge == NULL) { 993 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 994 ni->ni_macaddr, "shared key auth", 995 "%s", "no challenge"); 996 vap->iv_stats.is_rx_bad_auth++; 997 estatus = IEEE80211_STATUS_CHALLENGE; 998 goto bad; 999 } 1000 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1001 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1002 ni->ni_macaddr, "shared key auth", 1003 "bad challenge len %d", challenge[1]); 1004 vap->iv_stats.is_rx_bad_auth++; 1005 estatus = IEEE80211_STATUS_CHALLENGE; 1006 goto bad; 1007 } 1008 default: 1009 break; 1010 } 1011 if (vap->iv_state != IEEE80211_S_AUTH) 1012 return; 1013 switch (seq) { 1014 case IEEE80211_AUTH_SHARED_PASS: 1015 if (ni->ni_challenge != NULL) { 1016 FREE(ni->ni_challenge, M_80211_NODE); 1017 ni->ni_challenge = NULL; 1018 } 1019 if (status != 0) { 1020 IEEE80211_NOTE_FRAME(vap, 1021 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1022 "shared key auth failed (reason %d)", status); 1023 vap->iv_stats.is_rx_auth_fail++; 1024 vap->iv_stats.is_rx_authfail_code = status; 1025 return; 1026 } 1027 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1028 break; 1029 case IEEE80211_AUTH_SHARED_CHALLENGE: 1030 if (!ieee80211_alloc_challenge(ni)) 1031 return; 1032 /* XXX could optimize by passing recvd challenge */ 1033 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1034 IEEE80211_SEND_MGMT(ni, 1035 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1036 break; 1037 default: 1038 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1039 wh, "shared key auth", "bad seq %d", seq); 1040 vap->iv_stats.is_rx_bad_auth++; 1041 return; 1042 } 1043 return; 1044bad: 1045 /* 1046 * Kick the state machine. This short-circuits 1047 * using the mgt frame timeout to trigger the 1048 * state transition. 1049 */ 1050 if (vap->iv_state == IEEE80211_S_AUTH) 1051 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1052 IEEE80211_SCAN_FAIL_STATUS); 1053} 1054 1055static int 1056ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1057 const struct ieee80211_frame *wh) 1058{ 1059#define MS(_v, _f) (((_v) & _f) >> _f##_S) 1060 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1061 u_int len = frm[1], qosinfo; 1062 int i; 1063 1064 if (len < sizeof(struct ieee80211_wme_param)-2) { 1065 IEEE80211_DISCARD_IE(vap, 1066 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1067 wh, "WME", "too short, len %u", len); 1068 return -1; 1069 } 1070 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1071 qosinfo &= WME_QOSINFO_COUNT; 1072 /* XXX do proper check for wraparound */ 1073 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1074 return 0; 1075 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1076 for (i = 0; i < WME_NUM_AC; i++) { 1077 struct wmeParams *wmep = 1078 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1079 /* NB: ACI not used */ 1080 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1081 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1082 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1083 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1084 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1085 frm += 4; 1086 } 1087 wme->wme_wmeChanParams.cap_info = qosinfo; 1088 return 1; 1089#undef MS 1090} 1091 1092static int 1093ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 1094 const struct ieee80211_frame *wh) 1095{ 1096 struct ieee80211vap *vap = ni->ni_vap; 1097 const struct ieee80211_ath_ie *ath; 1098 u_int len = frm[1]; 1099 int capschanged; 1100 uint16_t defkeyix; 1101 1102 if (len < sizeof(struct ieee80211_ath_ie)-2) { 1103 IEEE80211_DISCARD_IE(vap, 1104 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 1105 wh, "Atheros", "too short, len %u", len); 1106 return -1; 1107 } 1108 ath = (const struct ieee80211_ath_ie *)frm; 1109 capschanged = (ni->ni_ath_flags != ath->ath_capability); 1110 defkeyix = LE_READ_2(ath->ath_defkeyix); 1111 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 1112 ni->ni_ath_flags = ath->ath_capability; 1113 ni->ni_ath_defkeyix = defkeyix; 1114 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 1115 "ath ie change: new caps 0x%x defkeyix 0x%x", 1116 ni->ni_ath_flags, ni->ni_ath_defkeyix); 1117 } 1118 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) { 1119 uint16_t curflags, newflags; 1120 1121 /* 1122 * Check for turbo mode switch. Calculate flags 1123 * for the new mode and effect the switch. 1124 */ 1125 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags; 1126 /* NB: BOOST is not in ic_flags, so get it from the ie */ 1127 if (ath->ath_capability & ATHEROS_CAP_BOOST) 1128 newflags |= IEEE80211_CHAN_TURBO; 1129 else 1130 newflags &= ~IEEE80211_CHAN_TURBO; 1131 if (newflags != curflags) 1132 ieee80211_dturbo_switch(vap, newflags); 1133 } 1134 return capschanged; 1135} 1136 1137/* 1138 * Return non-zero if a background scan may be continued: 1139 * o bg scan is active 1140 * o no channel switch is pending 1141 * o there has not been any traffic recently 1142 * 1143 * Note we do not check if there is an administrative enable; 1144 * this is only done to start the scan. We assume that any 1145 * change in state will be accompanied by a request to cancel 1146 * active scans which will otherwise cause this test to fail. 1147 */ 1148static __inline int 1149contbgscan(struct ieee80211vap *vap) 1150{ 1151 struct ieee80211com *ic = vap->iv_ic; 1152 1153 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1154 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1155 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1156 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1157} 1158 1159/* 1160 * Return non-zero if a backgrond scan may be started: 1161 * o bg scanning is administratively enabled 1162 * o no channel switch is pending 1163 * o we are not boosted on a dynamic turbo channel 1164 * o there has not been a scan recently 1165 * o there has not been any traffic recently 1166 */ 1167static __inline int 1168startbgscan(struct ieee80211vap *vap) 1169{ 1170 struct ieee80211com *ic = vap->iv_ic; 1171 1172 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1173 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1174 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1175 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1176 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1177} 1178 1179static void 1180sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1181 int subtype, int rssi, int noise, uint32_t rstamp) 1182{ 1183#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1184#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1185 struct ieee80211vap *vap = ni->ni_vap; 1186 struct ieee80211com *ic = ni->ni_ic; 1187 struct ieee80211_frame *wh; 1188 uint8_t *frm, *efrm; 1189 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1190 uint8_t rate; 1191 1192 wh = mtod(m0, struct ieee80211_frame *); 1193 frm = (uint8_t *)&wh[1]; 1194 efrm = mtod(m0, uint8_t *) + m0->m_len; 1195 switch (subtype) { 1196 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1197 case IEEE80211_FC0_SUBTYPE_BEACON: { 1198 struct ieee80211_scanparams scan; 1199 /* 1200 * We process beacon/probe response frames: 1201 * o when scanning, or 1202 * o station mode when associated (to collect state 1203 * updates such as 802.11g slot time), or 1204 * Frames otherwise received are discarded. 1205 */ 1206 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1207 vap->iv_stats.is_rx_mgtdiscard++; 1208 return; 1209 } 1210 /* XXX probe response in sta mode when !scanning? */ 1211 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1212 return; 1213 /* 1214 * Count frame now that we know it's to be processed. 1215 */ 1216 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1217 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1218 IEEE80211_NODE_STAT(ni, rx_beacons); 1219 } else 1220 IEEE80211_NODE_STAT(ni, rx_proberesp); 1221 /* 1222 * When operating in station mode, check for state updates. 1223 * Be careful to ignore beacons received while doing a 1224 * background scan. We consider only 11g/WMM stuff right now. 1225 */ 1226 if (ni->ni_associd != 0 && 1227 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1228 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1229 /* record tsf of last beacon */ 1230 memcpy(ni->ni_tstamp.data, scan.tstamp, 1231 sizeof(ni->ni_tstamp)); 1232 /* count beacon frame for s/w bmiss handling */ 1233 vap->iv_swbmiss_count++; 1234 vap->iv_bmiss_count = 0; 1235 if (ni->ni_erp != scan.erp) { 1236 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1237 wh->i_addr2, 1238 "erp change: was 0x%x, now 0x%x", 1239 ni->ni_erp, scan.erp); 1240 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1241 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1242 ic->ic_flags |= IEEE80211_F_USEPROT; 1243 else 1244 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1245 ni->ni_erp = scan.erp; 1246 /* XXX statistic */ 1247 /* XXX driver notification */ 1248 } 1249 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1250 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1251 wh->i_addr2, 1252 "capabilities change: was 0x%x, now 0x%x", 1253 ni->ni_capinfo, scan.capinfo); 1254 /* 1255 * NB: we assume short preamble doesn't 1256 * change dynamically 1257 */ 1258 ieee80211_set_shortslottime(ic, 1259 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1260 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1261 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1262 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1263 /* XXX statistic */ 1264 } 1265 if (scan.wme != NULL && 1266 (ni->ni_flags & IEEE80211_NODE_QOS) && 1267 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1268 ieee80211_wme_updateparams(vap); 1269 if (scan.ath != NULL) 1270 ieee80211_parse_athparams(ni, scan.ath, wh); 1271 if (scan.htcap != NULL && scan.htinfo != NULL && 1272 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1273 ieee80211_ht_updateparams(ni, 1274 scan.htcap, scan.htinfo); 1275 /* XXX state changes? */ 1276 } 1277 if (scan.tim != NULL) { 1278 struct ieee80211_tim_ie *tim = 1279 (struct ieee80211_tim_ie *) scan.tim; 1280#if 0 1281 int aid = IEEE80211_AID(ni->ni_associd); 1282 int ix = aid / NBBY; 1283 int min = tim->tim_bitctl &~ 1; 1284 int max = tim->tim_len + min - 4; 1285 if ((tim->tim_bitctl&1) || 1286 (min <= ix && ix <= max && 1287 isset(tim->tim_bitmap - min, aid))) { 1288 /* 1289 * XXX Do not let bg scan kick off 1290 * we are expecting data. 1291 */ 1292 ic->ic_lastdata = ticks; 1293 ieee80211_sta_pwrsave(vap, 0); 1294 } 1295#endif 1296 ni->ni_dtim_count = tim->tim_count; 1297 ni->ni_dtim_period = tim->tim_period; 1298 } 1299 /* 1300 * If scanning, pass the info to the scan module. 1301 * Otherwise, check if it's the right time to do 1302 * a background scan. Background scanning must 1303 * be enabled and we must not be operating in the 1304 * turbo phase of dynamic turbo mode. Then, 1305 * it's been a while since the last background 1306 * scan and if no data frames have come through 1307 * recently, kick off a scan. Note that this 1308 * is the mechanism by which a background scan 1309 * is started _and_ continued each time we 1310 * return on-channel to receive a beacon from 1311 * our ap. 1312 */ 1313 if (ic->ic_flags & IEEE80211_F_SCAN) { 1314 ieee80211_add_scan(vap, &scan, wh, 1315 subtype, rssi, noise, rstamp); 1316 } else if (contbgscan(vap)) { 1317 ieee80211_bg_scan(vap, 0); 1318 } else if (startbgscan(vap)) { 1319 vap->iv_stats.is_scan_bg++; 1320#if 0 1321 /* wakeup if we are sleeing */ 1322 ieee80211_set_pwrsave(vap, 0); 1323#endif 1324 ieee80211_bg_scan(vap, 0); 1325 } 1326 return; 1327 } 1328 /* 1329 * If scanning, just pass information to the scan module. 1330 */ 1331 if (ic->ic_flags & IEEE80211_F_SCAN) { 1332 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1333 /* 1334 * Actively scanning a channel marked passive; 1335 * send a probe request now that we know there 1336 * is 802.11 traffic present. 1337 * 1338 * XXX check if the beacon we recv'd gives 1339 * us what we need and suppress the probe req 1340 */ 1341 ieee80211_probe_curchan(vap, 1); 1342 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1343 } 1344 ieee80211_add_scan(vap, &scan, wh, 1345 subtype, rssi, noise, rstamp); 1346 return; 1347 } 1348 break; 1349 } 1350 1351 case IEEE80211_FC0_SUBTYPE_AUTH: { 1352 uint16_t algo, seq, status; 1353 /* 1354 * auth frame format 1355 * [2] algorithm 1356 * [2] sequence 1357 * [2] status 1358 * [tlv*] challenge 1359 */ 1360 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1361 algo = le16toh(*(uint16_t *)frm); 1362 seq = le16toh(*(uint16_t *)(frm + 2)); 1363 status = le16toh(*(uint16_t *)(frm + 4)); 1364 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1365 "recv auth frame with algorithm %d seq %d", algo, seq); 1366 1367 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1368 IEEE80211_DISCARD(vap, 1369 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1370 wh, "auth", "%s", "TKIP countermeasures enabled"); 1371 vap->iv_stats.is_rx_auth_countermeasures++; 1372 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1373 ieee80211_send_error(ni, wh->i_addr2, 1374 IEEE80211_FC0_SUBTYPE_AUTH, 1375 IEEE80211_REASON_MIC_FAILURE); 1376 } 1377 return; 1378 } 1379 if (algo == IEEE80211_AUTH_ALG_SHARED) 1380 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, 1381 noise, rstamp, seq, status); 1382 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1383 sta_auth_open(ni, wh, rssi, noise, rstamp, 1384 seq, status); 1385 else { 1386 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1387 wh, "auth", "unsupported alg %d", algo); 1388 vap->iv_stats.is_rx_auth_unsupported++; 1389 return; 1390 } 1391 break; 1392 } 1393 1394 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1395 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1396 uint16_t capinfo, associd; 1397 uint16_t status; 1398 1399 if (vap->iv_state != IEEE80211_S_ASSOC) { 1400 vap->iv_stats.is_rx_mgtdiscard++; 1401 return; 1402 } 1403 1404 /* 1405 * asresp frame format 1406 * [2] capability information 1407 * [2] status 1408 * [2] association ID 1409 * [tlv] supported rates 1410 * [tlv] extended supported rates 1411 * [tlv] WME 1412 * [tlv] HT capabilities 1413 * [tlv] HT info 1414 */ 1415 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1416 ni = vap->iv_bss; 1417 capinfo = le16toh(*(uint16_t *)frm); 1418 frm += 2; 1419 status = le16toh(*(uint16_t *)frm); 1420 frm += 2; 1421 if (status != 0) { 1422 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1423 wh->i_addr2, "%sassoc failed (reason %d)", 1424 ISREASSOC(subtype) ? "re" : "", status); 1425 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1426 return; 1427 } 1428 associd = le16toh(*(uint16_t *)frm); 1429 frm += 2; 1430 1431 rates = xrates = wme = htcap = htinfo = NULL; 1432 while (efrm - frm > 1) { 1433 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1434 switch (*frm) { 1435 case IEEE80211_ELEMID_RATES: 1436 rates = frm; 1437 break; 1438 case IEEE80211_ELEMID_XRATES: 1439 xrates = frm; 1440 break; 1441 case IEEE80211_ELEMID_HTCAP: 1442 htcap = frm; 1443 break; 1444 case IEEE80211_ELEMID_HTINFO: 1445 htinfo = frm; 1446 break; 1447 case IEEE80211_ELEMID_VENDOR: 1448 if (iswmeoui(frm)) 1449 wme = frm; 1450 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1451 /* 1452 * Accept pre-draft HT ie's if the 1453 * standard ones have not been seen. 1454 */ 1455 if (ishtcapoui(frm)) { 1456 if (htcap == NULL) 1457 htcap = frm; 1458 } else if (ishtinfooui(frm)) { 1459 if (htinfo == NULL) 1460 htcap = frm; 1461 } 1462 } 1463 /* XXX Atheros OUI support */ 1464 break; 1465 } 1466 frm += frm[1] + 2; 1467 } 1468 1469 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1470 if (xrates != NULL) 1471 IEEE80211_VERIFY_ELEMENT(xrates, 1472 IEEE80211_RATE_MAXSIZE - rates[1], return); 1473 rate = ieee80211_setup_rates(ni, rates, xrates, 1474 IEEE80211_F_JOIN | 1475 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1476 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1477 if (rate & IEEE80211_RATE_BASIC) { 1478 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1479 wh->i_addr2, 1480 "%sassoc failed (rate set mismatch)", 1481 ISREASSOC(subtype) ? "re" : ""); 1482 vap->iv_stats.is_rx_assoc_norate++; 1483 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1484 IEEE80211_SCAN_FAIL_STATUS); 1485 return; 1486 } 1487 1488 ni->ni_capinfo = capinfo; 1489 ni->ni_associd = associd; 1490 if (ni->ni_jointime == 0) 1491 ni->ni_jointime = time_uptime; 1492 if (wme != NULL && 1493 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1494 ni->ni_flags |= IEEE80211_NODE_QOS; 1495 ieee80211_wme_updateparams(vap); 1496 } else 1497 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1498 /* 1499 * Setup HT state according to the negotiation. 1500 * 1501 * NB: shouldn't need to check if HT use is enabled but some 1502 * ap's send back HT ie's even when we don't indicate we 1503 * are HT capable in our AssocReq. 1504 */ 1505 if (htcap != NULL && htinfo != NULL && 1506 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1507 ieee80211_ht_node_init(ni); 1508 ieee80211_ht_updateparams(ni, htcap, htinfo); 1509 ieee80211_setup_htrates(ni, htcap, 1510 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1511 ieee80211_setup_basic_htrates(ni, htinfo); 1512 } 1513 /* 1514 * Configure state now that we are associated. 1515 * 1516 * XXX may need different/additional driver callbacks? 1517 */ 1518 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1519 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1520 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1521 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1522 } else { 1523 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1524 ic->ic_flags |= IEEE80211_F_USEBARKER; 1525 } 1526 ieee80211_set_shortslottime(ic, 1527 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1528 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1529 /* 1530 * Honor ERP protection. 1531 * 1532 * NB: ni_erp should zero for non-11g operation. 1533 */ 1534 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1535 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1536 ic->ic_flags |= IEEE80211_F_USEPROT; 1537 else 1538 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1539 IEEE80211_NOTE_MAC(vap, 1540 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1541 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s", 1542 ISREASSOC(subtype) ? "re" : "", 1543 IEEE80211_NODE_AID(ni), 1544 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1545 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1546 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1547 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1548 ni->ni_flags & IEEE80211_NODE_HT ? 1549 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1550 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1551 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1552 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1553 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1554 ", fast-frames" : "", 1555 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1556 ", turbo" : "" 1557 ); 1558 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1559 break; 1560 } 1561 1562 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1563 uint16_t reason; 1564 1565 if (vap->iv_state == IEEE80211_S_SCAN) { 1566 vap->iv_stats.is_rx_mgtdiscard++; 1567 return; 1568 } 1569 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1570 /* NB: can happen when in promiscuous mode */ 1571 vap->iv_stats.is_rx_mgtdiscard++; 1572 break; 1573 } 1574 1575 /* 1576 * deauth frame format 1577 * [2] reason 1578 */ 1579 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1580 reason = le16toh(*(uint16_t *)frm); 1581 1582 vap->iv_stats.is_rx_deauth++; 1583 vap->iv_stats.is_rx_deauth_code = reason; 1584 IEEE80211_NODE_STAT(ni, rx_deauth); 1585 1586 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1587 "recv deauthenticate (reason %d)", reason); 1588 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1589 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1590 break; 1591 } 1592 1593 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1594 uint16_t reason; 1595 1596 if (vap->iv_state != IEEE80211_S_RUN && 1597 vap->iv_state != IEEE80211_S_ASSOC && 1598 vap->iv_state != IEEE80211_S_AUTH) { 1599 vap->iv_stats.is_rx_mgtdiscard++; 1600 return; 1601 } 1602 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1603 /* NB: can happen when in promiscuous mode */ 1604 vap->iv_stats.is_rx_mgtdiscard++; 1605 break; 1606 } 1607 1608 /* 1609 * disassoc frame format 1610 * [2] reason 1611 */ 1612 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1613 reason = le16toh(*(uint16_t *)frm); 1614 1615 vap->iv_stats.is_rx_disassoc++; 1616 vap->iv_stats.is_rx_disassoc_code = reason; 1617 IEEE80211_NODE_STAT(ni, rx_disassoc); 1618 1619 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1620 "recv disassociate (reason %d)", reason); 1621 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1622 break; 1623 } 1624 1625 case IEEE80211_FC0_SUBTYPE_ACTION: 1626 if (vap->iv_state == IEEE80211_S_RUN) { 1627 if (ieee80211_parse_action(ni, m0) == 0) 1628 ic->ic_recv_action(ni, frm, efrm); 1629 } else 1630 vap->iv_stats.is_rx_mgtdiscard++; 1631 break; 1632 1633 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1634 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1635 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1636 vap->iv_stats.is_rx_mgtdiscard++; 1637 return; 1638 default: 1639 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1640 wh, "mgt", "subtype 0x%x not handled", subtype); 1641 vap->iv_stats.is_rx_badsubtype++; 1642 break; 1643 } 1644#undef ISREASSOC 1645#undef ISPROBE 1646} 1647