1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11 Station mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_media.h> 52 #include <net/if_llc.h> 53 #include <net/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 63 static void sta_vattach(struct ieee80211vap *); 64 static void sta_beacon_miss(struct ieee80211vap *); 65 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 66 static int sta_input(struct ieee80211_node *, struct mbuf *, 67 int rssi, int noise, uint32_t rstamp); 68 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 69 int subtype, int rssi, int noise, uint32_t rstamp); 70 71 void 72 ieee80211_sta_attach(struct ieee80211com *ic) 73 { 74 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 75 } 76 77 void 78 ieee80211_sta_detach(struct ieee80211com *ic) 79 { 80 } 81 82 static void 83 sta_vdetach(struct ieee80211vap *vap) 84 { 85 } 86 87 static void 88 sta_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 */ 102 static void 103 sta_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 */ 160 static void 161 sta_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 */ 185 static int 186 sta_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 */ 421 static __inline int 422 isdstods_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 */ 442 static __inline int 443 isfromds_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 */ 458 static __inline int 459 doprint(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 */ 480 static int 481 sta_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) { 498 /* 499 * Fastpath for A-MPDU reorder q resubmission. Frames 500 * w/ M_AMPDU marked have already passed through here 501 * but were received out of order and been held on the 502 * reorder queue. When resubmitted they are marked 503 * with the M_AMPDU flag and we can bypass most of the 504 * 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. The station must be 599 * associated and negotiated HT. The frame must be 600 * a QoS frame (not QoS null data) and not previously 601 * processed for A-MPDU re-ordering. If the frame is 602 * to be processed directly then ieee80211_ampdu_reorder 603 * will return 0; otherwise it has consumed the mbuf 604 * and we should do nothing more with it. 605 */ 606 if ((ni->ni_flags & IEEE80211_NODE_HT) && 607 subtype == IEEE80211_FC0_SUBTYPE_QOS && 608 (dir == IEEE80211_FC1_DIR_FROMDS || 609 dir == IEEE80211_FC1_DIR_DSTODS) && 610 ieee80211_ampdu_reorder(ni, m) != 0) { 611 m = NULL; 612 goto out; 613 } 614 resubmit_ampdu: 615 if (dir == IEEE80211_FC1_DIR_FROMDS) { 616 if ((ifp->if_flags & IFF_SIMPLEX) && 617 isfromds_mcastecho(vap, wh)) { 618 /* 619 * In IEEE802.11 network, multicast 620 * packets sent from "me" are broadcast 621 * from the AP; silently discard for 622 * SIMPLEX interface. 623 */ 624 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 625 wh, "data", "%s", "multicast echo"); 626 vap->iv_stats.is_rx_mcastecho++; 627 goto out; 628 } 629 if ((vap->iv_flags & IEEE80211_F_DWDS) && 630 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 631 /* 632 * DWDS sta's must drop 3-address mcast frames 633 * as they will be sent separately as a 4-addr 634 * frame. Accepting the 3-addr frame will 635 * confuse the bridge into thinking the sending 636 * sta is located at the end of WDS link. 637 */ 638 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 639 "3-address data", "%s", "DWDS enabled"); 640 vap->iv_stats.is_rx_mcastecho++; 641 goto out; 642 } 643 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 644 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 645 IEEE80211_DISCARD(vap, 646 IEEE80211_MSG_INPUT, wh, "4-address data", 647 "%s", "DWDS not enabled"); 648 vap->iv_stats.is_rx_wrongdir++; 649 goto out; 650 } 651 if ((ifp->if_flags & IFF_SIMPLEX) && 652 isdstods_mcastecho(vap, wh)) { 653 /* 654 * In IEEE802.11 network, multicast 655 * packets sent from "me" are broadcast 656 * from the AP; silently discard for 657 * SIMPLEX interface. 658 */ 659 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 660 "4-address data", "%s", "multicast echo"); 661 vap->iv_stats.is_rx_mcastecho++; 662 goto out; 663 } 664 } else { 665 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 666 "data", "incorrect dir 0x%x", dir); 667 vap->iv_stats.is_rx_wrongdir++; 668 goto out; 669 } 670 671 /* 672 * Handle privacy requirements. Note that we 673 * must not be preempted from here until after 674 * we (potentially) call ieee80211_crypto_demic; 675 * otherwise we may violate assumptions in the 676 * crypto cipher modules used to do delayed update 677 * of replay sequence numbers. 678 */ 679 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 680 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 681 /* 682 * Discard encrypted frames when privacy is off. 683 */ 684 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 685 wh, "WEP", "%s", "PRIVACY off"); 686 vap->iv_stats.is_rx_noprivacy++; 687 IEEE80211_NODE_STAT(ni, rx_noprivacy); 688 goto out; 689 } 690 key = ieee80211_crypto_decap(ni, m, hdrspace); 691 if (key == NULL) { 692 /* NB: stats+msgs handled in crypto_decap */ 693 IEEE80211_NODE_STAT(ni, rx_wepfail); 694 goto out; 695 } 696 wh = mtod(m, struct ieee80211_frame *); 697 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 698 } else { 699 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 700 key = NULL; 701 } 702 703 /* 704 * Save QoS bits for use below--before we strip the header. 705 */ 706 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 707 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 708 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 709 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 710 } else 711 qos = 0; 712 713 /* 714 * Next up, any fragmentation. 715 */ 716 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 717 m = ieee80211_defrag(ni, m, hdrspace); 718 if (m == NULL) { 719 /* Fragment dropped or frame not complete yet */ 720 goto out; 721 } 722 } 723 wh = NULL; /* no longer valid, catch any uses */ 724 725 /* 726 * Next strip any MSDU crypto bits. 727 */ 728 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 729 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 730 ni->ni_macaddr, "data", "%s", "demic error"); 731 vap->iv_stats.is_rx_demicfail++; 732 IEEE80211_NODE_STAT(ni, rx_demicfail); 733 goto out; 734 } 735 736 /* copy to listener after decrypt */ 737 if (bpf_peers_present(vap->iv_rawbpf)) 738 bpf_mtap(vap->iv_rawbpf, m); 739 need_tap = 0; 740 741 /* 742 * Finally, strip the 802.11 header. 743 */ 744 m = ieee80211_decap(vap, m, hdrspace); 745 if (m == NULL) { 746 /* XXX mask bit to check for both */ 747 /* don't count Null data frames as errors */ 748 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 749 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 750 goto out; 751 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 752 ni->ni_macaddr, "data", "%s", "decap error"); 753 vap->iv_stats.is_rx_decap++; 754 IEEE80211_NODE_STAT(ni, rx_decap); 755 goto err; 756 } 757 eh = mtod(m, struct ether_header *); 758 if (!ieee80211_node_is_authorized(ni)) { 759 /* 760 * Deny any non-PAE frames received prior to 761 * authorization. For open/shared-key 762 * authentication the port is mark authorized 763 * after authentication completes. For 802.1x 764 * the port is not marked authorized by the 765 * authenticator until the handshake has completed. 766 */ 767 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 768 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 769 eh->ether_shost, "data", 770 "unauthorized port: ether type 0x%x len %u", 771 eh->ether_type, m->m_pkthdr.len); 772 vap->iv_stats.is_rx_unauth++; 773 IEEE80211_NODE_STAT(ni, rx_unauth); 774 goto err; 775 } 776 } else { 777 /* 778 * When denying unencrypted frames, discard 779 * any non-PAE frames received without encryption. 780 */ 781 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 782 (key == NULL && (m->m_flags & M_WEP) == 0) && 783 eh->ether_type != htons(ETHERTYPE_PAE)) { 784 /* 785 * Drop unencrypted frames. 786 */ 787 vap->iv_stats.is_rx_unencrypted++; 788 IEEE80211_NODE_STAT(ni, rx_unencrypted); 789 goto out; 790 } 791 } 792 /* XXX require HT? */ 793 if (qos & IEEE80211_QOS_AMSDU) { 794 m = ieee80211_decap_amsdu(ni, m); 795 if (m == NULL) 796 return IEEE80211_FC0_TYPE_DATA; 797 } else if ((ni->ni_ath_flags & IEEE80211_NODE_FF) && 798 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 799 m->m_pkthdr.len >= 3*FF_LLC_SIZE) { 800 struct llc *llc; 801 802 /* 803 * Check for fast-frame tunnel encapsulation. 804 */ 805 if (m->m_len < FF_LLC_SIZE && 806 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 807 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 808 ni->ni_macaddr, "fast-frame", 809 "%s", "m_pullup(llc) failed"); 810 vap->iv_stats.is_rx_tooshort++; 811 return IEEE80211_FC0_TYPE_DATA; 812 } 813 llc = (struct llc *)(mtod(m, uint8_t *) + 814 sizeof(struct ether_header)); 815 if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) { 816 m_adj(m, FF_LLC_SIZE); 817 m = ieee80211_decap_fastframe(ni, m); 818 if (m == NULL) 819 return IEEE80211_FC0_TYPE_DATA; 820 } 821 } 822 #undef FF_LLC_SIZE 823 ieee80211_deliver_data(vap, ni, m); 824 return IEEE80211_FC0_TYPE_DATA; 825 826 case IEEE80211_FC0_TYPE_MGT: 827 vap->iv_stats.is_rx_mgmt++; 828 IEEE80211_NODE_STAT(ni, rx_mgmt); 829 if (dir != IEEE80211_FC1_DIR_NODS) { 830 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 831 wh, "data", "incorrect dir 0x%x", dir); 832 vap->iv_stats.is_rx_wrongdir++; 833 goto err; 834 } 835 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 836 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 837 ni->ni_macaddr, "mgt", "too short: len %u", 838 m->m_pkthdr.len); 839 vap->iv_stats.is_rx_tooshort++; 840 goto out; 841 } 842 #ifdef IEEE80211_DEBUG 843 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 844 ieee80211_msg_dumppkts(vap)) { 845 if_printf(ifp, "received %s from %s rssi %d\n", 846 ieee80211_mgt_subtype_name[subtype >> 847 IEEE80211_FC0_SUBTYPE_SHIFT], 848 ether_sprintf(wh->i_addr2), rssi); 849 } 850 #endif 851 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 852 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 853 /* 854 * Only shared key auth frames with a challenge 855 * should be encrypted, discard all others. 856 */ 857 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 858 wh, ieee80211_mgt_subtype_name[subtype >> 859 IEEE80211_FC0_SUBTYPE_SHIFT], 860 "%s", "WEP set but not permitted"); 861 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 862 goto out; 863 } 864 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 865 /* 866 * Discard encrypted frames when privacy is off. 867 */ 868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 869 wh, "mgt", "%s", "WEP set but PRIVACY off"); 870 vap->iv_stats.is_rx_noprivacy++; 871 goto out; 872 } 873 hdrspace = ieee80211_hdrspace(ic, wh); 874 key = ieee80211_crypto_decap(ni, m, hdrspace); 875 if (key == NULL) { 876 /* NB: stats+msgs handled in crypto_decap */ 877 goto out; 878 } 879 wh = mtod(m, struct ieee80211_frame *); 880 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 881 } 882 if (bpf_peers_present(vap->iv_rawbpf)) 883 bpf_mtap(vap->iv_rawbpf, m); 884 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 885 m_freem(m); 886 return IEEE80211_FC0_TYPE_MGT; 887 888 case IEEE80211_FC0_TYPE_CTL: 889 vap->iv_stats.is_rx_ctl++; 890 IEEE80211_NODE_STAT(ni, rx_ctrl); 891 goto out; 892 default: 893 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 894 wh, NULL, "bad frame type 0x%x", type); 895 /* should not come here */ 896 break; 897 } 898 err: 899 ifp->if_ierrors++; 900 out: 901 if (m != NULL) { 902 if (bpf_peers_present(vap->iv_rawbpf) && need_tap) 903 bpf_mtap(vap->iv_rawbpf, m); 904 m_freem(m); 905 } 906 return type; 907 #undef SEQ_LEQ 908 } 909 910 static void 911 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 912 int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) 913 { 914 struct ieee80211vap *vap = ni->ni_vap; 915 916 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 917 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 918 ni->ni_macaddr, "open auth", 919 "bad sta auth mode %u", ni->ni_authmode); 920 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 921 return; 922 } 923 if (vap->iv_state != IEEE80211_S_AUTH || 924 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 925 vap->iv_stats.is_rx_bad_auth++; 926 return; 927 } 928 if (status != 0) { 929 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 930 ni, "open auth failed (reason %d)", status); 931 vap->iv_stats.is_rx_auth_fail++; 932 vap->iv_stats.is_rx_authfail_code = status; 933 ieee80211_new_state(vap, IEEE80211_S_SCAN, 934 IEEE80211_SCAN_FAIL_STATUS); 935 } else 936 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 937 } 938 939 static void 940 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 941 uint8_t *frm, uint8_t *efrm, int rssi, int noise, uint32_t rstamp, 942 uint16_t seq, uint16_t status) 943 { 944 struct ieee80211vap *vap = ni->ni_vap; 945 uint8_t *challenge; 946 int estatus; 947 948 /* 949 * NB: this can happen as we allow pre-shared key 950 * authentication to be enabled w/o wep being turned 951 * on so that configuration of these can be done 952 * in any order. It may be better to enforce the 953 * ordering in which case this check would just be 954 * for sanity/consistency. 955 */ 956 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 957 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 958 ni->ni_macaddr, "shared key auth", 959 "%s", " PRIVACY is disabled"); 960 estatus = IEEE80211_STATUS_ALG; 961 goto bad; 962 } 963 /* 964 * Pre-shared key authentication is evil; accept 965 * it only if explicitly configured (it is supported 966 * mainly for compatibility with clients like OS X). 967 */ 968 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 969 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 970 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 971 ni->ni_macaddr, "shared key auth", 972 "bad sta auth mode %u", ni->ni_authmode); 973 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 974 estatus = IEEE80211_STATUS_ALG; 975 goto bad; 976 } 977 978 challenge = NULL; 979 if (frm + 1 < efrm) { 980 if ((frm[1] + 2) > (efrm - frm)) { 981 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 982 ni->ni_macaddr, "shared key auth", 983 "ie %d/%d too long", 984 frm[0], (frm[1] + 2) - (efrm - frm)); 985 vap->iv_stats.is_rx_bad_auth++; 986 estatus = IEEE80211_STATUS_CHALLENGE; 987 goto bad; 988 } 989 if (*frm == IEEE80211_ELEMID_CHALLENGE) 990 challenge = frm; 991 frm += frm[1] + 2; 992 } 993 switch (seq) { 994 case IEEE80211_AUTH_SHARED_CHALLENGE: 995 case IEEE80211_AUTH_SHARED_RESPONSE: 996 if (challenge == NULL) { 997 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 998 ni->ni_macaddr, "shared key auth", 999 "%s", "no challenge"); 1000 vap->iv_stats.is_rx_bad_auth++; 1001 estatus = IEEE80211_STATUS_CHALLENGE; 1002 goto bad; 1003 } 1004 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1005 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1006 ni->ni_macaddr, "shared key auth", 1007 "bad challenge len %d", challenge[1]); 1008 vap->iv_stats.is_rx_bad_auth++; 1009 estatus = IEEE80211_STATUS_CHALLENGE; 1010 goto bad; 1011 } 1012 default: 1013 break; 1014 } 1015 if (vap->iv_state != IEEE80211_S_AUTH) 1016 return; 1017 switch (seq) { 1018 case IEEE80211_AUTH_SHARED_PASS: 1019 if (ni->ni_challenge != NULL) { 1020 FREE(ni->ni_challenge, M_80211_NODE); 1021 ni->ni_challenge = NULL; 1022 } 1023 if (status != 0) { 1024 IEEE80211_NOTE_FRAME(vap, 1025 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1026 "shared key auth failed (reason %d)", status); 1027 vap->iv_stats.is_rx_auth_fail++; 1028 vap->iv_stats.is_rx_authfail_code = status; 1029 return; 1030 } 1031 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1032 break; 1033 case IEEE80211_AUTH_SHARED_CHALLENGE: 1034 if (!ieee80211_alloc_challenge(ni)) 1035 return; 1036 /* XXX could optimize by passing recvd challenge */ 1037 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1038 IEEE80211_SEND_MGMT(ni, 1039 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1040 break; 1041 default: 1042 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1043 wh, "shared key auth", "bad seq %d", seq); 1044 vap->iv_stats.is_rx_bad_auth++; 1045 return; 1046 } 1047 return; 1048 bad: 1049 /* 1050 * Kick the state machine. This short-circuits 1051 * using the mgt frame timeout to trigger the 1052 * state transition. 1053 */ 1054 if (vap->iv_state == IEEE80211_S_AUTH) 1055 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1056 IEEE80211_SCAN_FAIL_STATUS); 1057 } 1058 1059 static int 1060 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1061 const struct ieee80211_frame *wh) 1062 { 1063 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1064 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1065 u_int len = frm[1], qosinfo; 1066 int i; 1067 1068 if (len < sizeof(struct ieee80211_wme_param)-2) { 1069 IEEE80211_DISCARD_IE(vap, 1070 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1071 wh, "WME", "too short, len %u", len); 1072 return -1; 1073 } 1074 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1075 qosinfo &= WME_QOSINFO_COUNT; 1076 /* XXX do proper check for wraparound */ 1077 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1078 return 0; 1079 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1080 for (i = 0; i < WME_NUM_AC; i++) { 1081 struct wmeParams *wmep = 1082 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1083 /* NB: ACI not used */ 1084 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1085 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1086 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1087 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1088 wmep->wmep_txopLimit = LE_READ_2(frm+2); 1089 frm += 4; 1090 } 1091 wme->wme_wmeChanParams.cap_info = qosinfo; 1092 return 1; 1093 #undef MS 1094 } 1095 1096 static int 1097 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 1098 const struct ieee80211_frame *wh) 1099 { 1100 struct ieee80211vap *vap = ni->ni_vap; 1101 const struct ieee80211_ath_ie *ath; 1102 u_int len = frm[1]; 1103 int capschanged; 1104 uint16_t defkeyix; 1105 1106 if (len < sizeof(struct ieee80211_ath_ie)-2) { 1107 IEEE80211_DISCARD_IE(vap, 1108 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 1109 wh, "Atheros", "too short, len %u", len); 1110 return -1; 1111 } 1112 ath = (const struct ieee80211_ath_ie *)frm; 1113 capschanged = (ni->ni_ath_flags != ath->ath_capability); 1114 defkeyix = LE_READ_2(ath->ath_defkeyix); 1115 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 1116 ni->ni_ath_flags = ath->ath_capability; 1117 ni->ni_ath_defkeyix = defkeyix; 1118 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 1119 "ath ie change: new caps 0x%x defkeyix 0x%x", 1120 ni->ni_ath_flags, ni->ni_ath_defkeyix); 1121 } 1122 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) { 1123 uint16_t curflags, newflags; 1124 1125 /* 1126 * Check for turbo mode switch. Calculate flags 1127 * for the new mode and effect the switch. 1128 */ 1129 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags; 1130 /* NB: BOOST is not in ic_flags, so get it from the ie */ 1131 if (ath->ath_capability & ATHEROS_CAP_BOOST) 1132 newflags |= IEEE80211_CHAN_TURBO; 1133 else 1134 newflags &= ~IEEE80211_CHAN_TURBO; 1135 if (newflags != curflags) 1136 ieee80211_dturbo_switch(vap, newflags); 1137 } 1138 return capschanged; 1139 } 1140 1141 /* 1142 * Return non-zero if a background scan may be continued: 1143 * o bg scan is active 1144 * o no channel switch is pending 1145 * o there has not been any traffic recently 1146 * 1147 * Note we do not check if there is an administrative enable; 1148 * this is only done to start the scan. We assume that any 1149 * change in state will be accompanied by a request to cancel 1150 * active scans which will otherwise cause this test to fail. 1151 */ 1152 static __inline int 1153 contbgscan(struct ieee80211vap *vap) 1154 { 1155 struct ieee80211com *ic = vap->iv_ic; 1156 1157 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1158 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1159 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1160 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1161 } 1162 1163 /* 1164 * Return non-zero if a backgrond scan may be started: 1165 * o bg scanning is administratively enabled 1166 * o no channel switch is pending 1167 * o we are not boosted on a dynamic turbo channel 1168 * o there has not been a scan recently 1169 * o there has not been any traffic recently 1170 */ 1171 static __inline int 1172 startbgscan(struct ieee80211vap *vap) 1173 { 1174 struct ieee80211com *ic = vap->iv_ic; 1175 1176 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1177 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1178 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1179 time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1180 time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1181 } 1182 1183 static void 1184 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1185 int subtype, int rssi, int noise, uint32_t rstamp) 1186 { 1187 #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 1188 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1189 struct ieee80211vap *vap = ni->ni_vap; 1190 struct ieee80211com *ic = ni->ni_ic; 1191 struct ieee80211_frame *wh; 1192 uint8_t *frm, *efrm; 1193 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1194 uint8_t rate; 1195 1196 wh = mtod(m0, struct ieee80211_frame *); 1197 frm = (uint8_t *)&wh[1]; 1198 efrm = mtod(m0, uint8_t *) + m0->m_len; 1199 switch (subtype) { 1200 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1201 case IEEE80211_FC0_SUBTYPE_BEACON: { 1202 struct ieee80211_scanparams scan; 1203 /* 1204 * We process beacon/probe response frames: 1205 * o when scanning, or 1206 * o station mode when associated (to collect state 1207 * updates such as 802.11g slot time), or 1208 * Frames otherwise received are discarded. 1209 */ 1210 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1211 vap->iv_stats.is_rx_mgtdiscard++; 1212 return; 1213 } 1214 /* XXX probe response in sta mode when !scanning? */ 1215 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 1216 return; 1217 /* 1218 * Count frame now that we know it's to be processed. 1219 */ 1220 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1221 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1222 IEEE80211_NODE_STAT(ni, rx_beacons); 1223 } else 1224 IEEE80211_NODE_STAT(ni, rx_proberesp); 1225 /* 1226 * When operating in station mode, check for state updates. 1227 * Be careful to ignore beacons received while doing a 1228 * background scan. We consider only 11g/WMM stuff right now. 1229 */ 1230 if (ni->ni_associd != 0 && 1231 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1232 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1233 /* record tsf of last beacon */ 1234 memcpy(ni->ni_tstamp.data, scan.tstamp, 1235 sizeof(ni->ni_tstamp)); 1236 /* count beacon frame for s/w bmiss handling */ 1237 vap->iv_swbmiss_count++; 1238 vap->iv_bmiss_count = 0; 1239 if (ni->ni_erp != scan.erp) { 1240 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1241 wh->i_addr2, 1242 "erp change: was 0x%x, now 0x%x", 1243 ni->ni_erp, scan.erp); 1244 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1245 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1246 ic->ic_flags |= IEEE80211_F_USEPROT; 1247 else 1248 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1249 ni->ni_erp = scan.erp; 1250 /* XXX statistic */ 1251 /* XXX driver notification */ 1252 } 1253 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1254 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1255 wh->i_addr2, 1256 "capabilities change: was 0x%x, now 0x%x", 1257 ni->ni_capinfo, scan.capinfo); 1258 /* 1259 * NB: we assume short preamble doesn't 1260 * change dynamically 1261 */ 1262 ieee80211_set_shortslottime(ic, 1263 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1264 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1265 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1266 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1267 /* XXX statistic */ 1268 } 1269 if (scan.wme != NULL && 1270 (ni->ni_flags & IEEE80211_NODE_QOS) && 1271 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1272 ieee80211_wme_updateparams(vap); 1273 if (scan.ath != NULL) 1274 ieee80211_parse_athparams(ni, scan.ath, wh); 1275 if (scan.htcap != NULL && scan.htinfo != NULL) { 1276 ieee80211_parse_htcap(ni, scan.htcap); 1277 ieee80211_parse_htinfo(ni, scan.htinfo); 1278 /* XXX state changes? */ 1279 } 1280 if (scan.tim != NULL) { 1281 struct ieee80211_tim_ie *tim = 1282 (struct ieee80211_tim_ie *) scan.tim; 1283 #if 0 1284 int aid = IEEE80211_AID(ni->ni_associd); 1285 int ix = aid / NBBY; 1286 int min = tim->tim_bitctl &~ 1; 1287 int max = tim->tim_len + min - 4; 1288 if ((tim->tim_bitctl&1) || 1289 (min <= ix && ix <= max && 1290 isset(tim->tim_bitmap - min, aid))) { 1291 /* 1292 * XXX Do not let bg scan kick off 1293 * we are expecting data. 1294 */ 1295 ic->ic_lastdata = ticks; 1296 ieee80211_sta_pwrsave(vap, 0); 1297 } 1298 #endif 1299 ni->ni_dtim_count = tim->tim_count; 1300 ni->ni_dtim_period = tim->tim_period; 1301 } 1302 /* 1303 * If scanning, pass the info to the scan module. 1304 * Otherwise, check if it's the right time to do 1305 * a background scan. Background scanning must 1306 * be enabled and we must not be operating in the 1307 * turbo phase of dynamic turbo mode. Then, 1308 * it's been a while since the last background 1309 * scan and if no data frames have come through 1310 * recently, kick off a scan. Note that this 1311 * is the mechanism by which a background scan 1312 * is started _and_ continued each time we 1313 * return on-channel to receive a beacon from 1314 * our ap. 1315 */ 1316 if (ic->ic_flags & IEEE80211_F_SCAN) { 1317 ieee80211_add_scan(vap, &scan, wh, 1318 subtype, rssi, noise, rstamp); 1319 } else if (contbgscan(vap)) { 1320 ieee80211_bg_scan(vap, 0); 1321 } else if (startbgscan(vap)) { 1322 vap->iv_stats.is_scan_bg++; 1323 #if 0 1324 /* wakeup if we are sleeing */ 1325 ieee80211_set_pwrsave(vap, 0); 1326 #endif 1327 ieee80211_bg_scan(vap, 0); 1328 } 1329 return; 1330 } 1331 /* 1332 * If scanning, just pass information to the scan module. 1333 */ 1334 if (ic->ic_flags & IEEE80211_F_SCAN) { 1335 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1336 /* 1337 * Actively scanning a channel marked passive; 1338 * send a probe request now that we know there 1339 * is 802.11 traffic present. 1340 * 1341 * XXX check if the beacon we recv'd gives 1342 * us what we need and suppress the probe req 1343 */ 1344 ieee80211_probe_curchan(vap, 1); 1345 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1346 } 1347 ieee80211_add_scan(vap, &scan, wh, 1348 subtype, rssi, noise, rstamp); 1349 return; 1350 } 1351 break; 1352 } 1353 1354 case IEEE80211_FC0_SUBTYPE_AUTH: { 1355 uint16_t algo, seq, status; 1356 /* 1357 * auth frame format 1358 * [2] algorithm 1359 * [2] sequence 1360 * [2] status 1361 * [tlv*] challenge 1362 */ 1363 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1364 algo = le16toh(*(uint16_t *)frm); 1365 seq = le16toh(*(uint16_t *)(frm + 2)); 1366 status = le16toh(*(uint16_t *)(frm + 4)); 1367 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1368 "recv auth frame with algorithm %d seq %d", algo, seq); 1369 1370 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1371 IEEE80211_DISCARD(vap, 1372 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1373 wh, "auth", "%s", "TKIP countermeasures enabled"); 1374 vap->iv_stats.is_rx_auth_countermeasures++; 1375 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1376 ieee80211_send_error(ni, wh->i_addr2, 1377 IEEE80211_FC0_SUBTYPE_AUTH, 1378 IEEE80211_REASON_MIC_FAILURE); 1379 } 1380 return; 1381 } 1382 if (algo == IEEE80211_AUTH_ALG_SHARED) 1383 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, 1384 noise, rstamp, seq, status); 1385 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1386 sta_auth_open(ni, wh, rssi, noise, rstamp, 1387 seq, status); 1388 else { 1389 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1390 wh, "auth", "unsupported alg %d", algo); 1391 vap->iv_stats.is_rx_auth_unsupported++; 1392 return; 1393 } 1394 break; 1395 } 1396 1397 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1398 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1399 uint16_t capinfo, associd; 1400 uint16_t status; 1401 1402 if (vap->iv_state != IEEE80211_S_ASSOC) { 1403 vap->iv_stats.is_rx_mgtdiscard++; 1404 return; 1405 } 1406 1407 /* 1408 * asresp frame format 1409 * [2] capability information 1410 * [2] status 1411 * [2] association ID 1412 * [tlv] supported rates 1413 * [tlv] extended supported rates 1414 * [tlv] WME 1415 * [tlv] HT capabilities 1416 * [tlv] HT info 1417 */ 1418 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1419 ni = vap->iv_bss; 1420 capinfo = le16toh(*(uint16_t *)frm); 1421 frm += 2; 1422 status = le16toh(*(uint16_t *)frm); 1423 frm += 2; 1424 if (status != 0) { 1425 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1426 wh->i_addr2, "%sassoc failed (reason %d)", 1427 ISREASSOC(subtype) ? "re" : "", status); 1428 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1429 return; 1430 } 1431 associd = le16toh(*(uint16_t *)frm); 1432 frm += 2; 1433 1434 rates = xrates = wme = htcap = htinfo = NULL; 1435 while (efrm - frm > 1) { 1436 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1437 switch (*frm) { 1438 case IEEE80211_ELEMID_RATES: 1439 rates = frm; 1440 break; 1441 case IEEE80211_ELEMID_XRATES: 1442 xrates = frm; 1443 break; 1444 case IEEE80211_ELEMID_HTCAP: 1445 htcap = frm; 1446 break; 1447 case IEEE80211_ELEMID_HTINFO: 1448 htinfo = frm; 1449 break; 1450 case IEEE80211_ELEMID_VENDOR: 1451 if (iswmeoui(frm)) 1452 wme = frm; 1453 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1454 /* 1455 * Accept pre-draft HT ie's if the 1456 * standard ones have not been seen. 1457 */ 1458 if (ishtcapoui(frm)) { 1459 if (htcap == NULL) 1460 htcap = frm; 1461 } else if (ishtinfooui(frm)) { 1462 if (htinfo == NULL) 1463 htcap = frm; 1464 } 1465 } 1466 /* XXX Atheros OUI support */ 1467 break; 1468 } 1469 frm += frm[1] + 2; 1470 } 1471 1472 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1473 if (xrates != NULL) 1474 IEEE80211_VERIFY_ELEMENT(xrates, 1475 IEEE80211_RATE_MAXSIZE - rates[1], return); 1476 rate = ieee80211_setup_rates(ni, rates, xrates, 1477 IEEE80211_F_JOIN | 1478 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1479 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1480 if (rate & IEEE80211_RATE_BASIC) { 1481 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1482 wh->i_addr2, 1483 "%sassoc failed (rate set mismatch)", 1484 ISREASSOC(subtype) ? "re" : ""); 1485 vap->iv_stats.is_rx_assoc_norate++; 1486 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1487 IEEE80211_SCAN_FAIL_STATUS); 1488 return; 1489 } 1490 1491 ni->ni_capinfo = capinfo; 1492 ni->ni_associd = associd; 1493 if (ni->ni_jointime == 0) 1494 ni->ni_jointime = time_uptime; 1495 if (wme != NULL && 1496 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1497 ni->ni_flags |= IEEE80211_NODE_QOS; 1498 ieee80211_wme_updateparams(vap); 1499 } else 1500 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1501 /* 1502 * Setup HT state according to the negotiation. 1503 * 1504 * NB: shouldn't need to check if HT use is enabled but some 1505 * ap's send back HT ie's even when we don't indicate we 1506 * are HT capable in our AssocReq. 1507 */ 1508 if (htcap != NULL && htinfo != NULL && 1509 (vap->iv_flags_ext & IEEE80211_FEXT_HT)) { 1510 ieee80211_ht_node_init(ni, htcap); 1511 ieee80211_parse_htinfo(ni, htinfo); 1512 ieee80211_setup_htrates(ni, htcap, 1513 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1514 ieee80211_setup_basic_htrates(ni, htinfo); 1515 } 1516 /* 1517 * Configure state now that we are associated. 1518 * 1519 * XXX may need different/additional driver callbacks? 1520 */ 1521 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1522 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1523 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1524 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1525 } else { 1526 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1527 ic->ic_flags |= IEEE80211_F_USEBARKER; 1528 } 1529 ieee80211_set_shortslottime(ic, 1530 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1531 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1532 /* 1533 * Honor ERP protection. 1534 * 1535 * NB: ni_erp should zero for non-11g operation. 1536 */ 1537 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1538 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1539 ic->ic_flags |= IEEE80211_F_USEPROT; 1540 else 1541 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1542 IEEE80211_NOTE_MAC(vap, 1543 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1544 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s", 1545 ISREASSOC(subtype) ? "re" : "", 1546 IEEE80211_NODE_AID(ni), 1547 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1548 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1549 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1550 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1551 ni->ni_flags & IEEE80211_NODE_HT ? 1552 (ni->ni_chw == 20 ? ", HT20" : ", HT40") : "", 1553 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1554 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1555 ", fast-frames" : "", 1556 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1557 ", turbo" : "" 1558 ); 1559 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1560 break; 1561 } 1562 1563 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1564 uint16_t reason; 1565 1566 if (vap->iv_state == IEEE80211_S_SCAN) { 1567 vap->iv_stats.is_rx_mgtdiscard++; 1568 return; 1569 } 1570 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1571 /* NB: can happen when in promiscuous mode */ 1572 vap->iv_stats.is_rx_mgtdiscard++; 1573 break; 1574 } 1575 1576 /* 1577 * deauth frame format 1578 * [2] reason 1579 */ 1580 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1581 reason = le16toh(*(uint16_t *)frm); 1582 1583 vap->iv_stats.is_rx_deauth++; 1584 vap->iv_stats.is_rx_deauth_code = reason; 1585 IEEE80211_NODE_STAT(ni, rx_deauth); 1586 1587 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1588 "recv deauthenticate (reason %d)", reason); 1589 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1590 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1591 break; 1592 } 1593 1594 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1595 uint16_t reason; 1596 1597 if (vap->iv_state != IEEE80211_S_RUN && 1598 vap->iv_state != IEEE80211_S_ASSOC && 1599 vap->iv_state != IEEE80211_S_AUTH) { 1600 vap->iv_stats.is_rx_mgtdiscard++; 1601 return; 1602 } 1603 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1604 /* NB: can happen when in promiscuous mode */ 1605 vap->iv_stats.is_rx_mgtdiscard++; 1606 break; 1607 } 1608 1609 /* 1610 * disassoc frame format 1611 * [2] reason 1612 */ 1613 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1614 reason = le16toh(*(uint16_t *)frm); 1615 1616 vap->iv_stats.is_rx_disassoc++; 1617 vap->iv_stats.is_rx_disassoc_code = reason; 1618 IEEE80211_NODE_STAT(ni, rx_disassoc); 1619 1620 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1621 "recv disassociate (reason %d)", reason); 1622 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1623 break; 1624 } 1625 1626 case IEEE80211_FC0_SUBTYPE_ACTION: 1627 if (vap->iv_state == IEEE80211_S_RUN) { 1628 if (ieee80211_parse_action(ni, m0) == 0) 1629 ic->ic_recv_action(ni, frm, efrm); 1630 } else 1631 vap->iv_stats.is_rx_mgtdiscard++; 1632 break; 1633 1634 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1635 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1636 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1637 vap->iv_stats.is_rx_mgtdiscard++; 1638 return; 1639 default: 1640 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1641 wh, "mgt", "subtype 0x%x not handled", subtype); 1642 vap->iv_stats.is_rx_badsubtype++; 1643 break; 1644 } 1645 #undef ISREASSOC 1646 #undef ISPROBE 1647 } 1648