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/if_dl.h> 54 #include <net/if_var.h> 55 #include <net/ethernet.h> 56 57 #include <net/bpf.h> 58 59 #include <net80211/ieee80211_var.h> 60 #include <net80211/ieee80211_sta.h> 61 #include <net80211/ieee80211_input.h> 62 #ifdef IEEE80211_SUPPORT_SUPERG 63 #include <net80211/ieee80211_superg.h> 64 #endif 65 #include <net80211/ieee80211_ratectl.h> 66 #include <net80211/ieee80211_sta.h> 67 68 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 69 70 static void sta_vattach(struct ieee80211vap *); 71 static void sta_beacon_miss(struct ieee80211vap *); 72 static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int); 73 static int sta_input(struct ieee80211_node *, struct mbuf *, 74 const struct ieee80211_rx_stats *, int, int); 75 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *, int rssi, int nf); 77 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 78 79 void 80 ieee80211_sta_attach(struct ieee80211com *ic) 81 { 82 ic->ic_vattach[IEEE80211_M_STA] = sta_vattach; 83 } 84 85 void 86 ieee80211_sta_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 sta_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 sta_vattach(struct ieee80211vap *vap) 97 { 98 vap->iv_newstate = sta_newstate; 99 vap->iv_input = sta_input; 100 vap->iv_recv_mgmt = sta_recv_mgmt; 101 vap->iv_recv_ctl = sta_recv_ctl; 102 vap->iv_opdetach = sta_vdetach; 103 vap->iv_bmiss = sta_beacon_miss; 104 } 105 106 /* 107 * Handle a beacon miss event. The common code filters out 108 * spurious events that can happen when scanning and/or before 109 * reaching RUN state. 110 */ 111 static void 112 sta_beacon_miss(struct ieee80211vap *vap) 113 { 114 struct ieee80211com *ic = vap->iv_ic; 115 116 IEEE80211_LOCK_ASSERT(ic); 117 118 KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning")); 119 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 120 ("wrong state %s", ieee80211_state_name[vap->iv_state])); 121 122 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG, 123 "beacon miss, mode %s state %s\n", 124 ieee80211_opmode_name[vap->iv_opmode], 125 ieee80211_state_name[vap->iv_state]); 126 127 if (vap->iv_state == IEEE80211_S_CSA) { 128 /* 129 * A Channel Switch is pending; assume we missed the 130 * beacon that would've completed the process and just 131 * force the switch. If we made a mistake we'll not 132 * find the AP on the new channel and fall back to a 133 * normal scan. 134 */ 135 ieee80211_csa_completeswitch(ic); 136 return; 137 } 138 if (++vap->iv_bmiss_count < vap->iv_bmiss_max) { 139 /* 140 * Send a directed probe req before falling back to a 141 * scan; if we receive a response ic_bmiss_count will 142 * be reset. Some cards mistakenly report beacon miss 143 * so this avoids the expensive scan if the ap is 144 * still there. 145 */ 146 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr, 147 vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid, 148 vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen); 149 return; 150 } 151 152 callout_stop(&vap->iv_swbmiss); 153 vap->iv_bmiss_count = 0; 154 vap->iv_stats.is_beacon_miss++; 155 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 156 #ifdef IEEE80211_SUPPORT_SUPERG 157 158 /* 159 * If we receive a beacon miss interrupt when using 160 * dynamic turbo, attempt to switch modes before 161 * reassociating. 162 */ 163 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP)) 164 ieee80211_dturbo_switch(vap, 165 ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO); 166 #endif 167 /* 168 * Try to reassociate before scanning for a new ap. 169 */ 170 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1); 171 } else { 172 /* 173 * Somebody else is controlling state changes (e.g. 174 * a user-mode app) don't do anything that would 175 * confuse them; just drop into scan mode so they'll 176 * notified of the state change and given control. 177 */ 178 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0); 179 } 180 } 181 182 /* 183 * Handle deauth with reason. We retry only for 184 * the cases where we might succeed. Otherwise 185 * we downgrade the ap and scan. 186 */ 187 static void 188 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason) 189 { 190 switch (reason) { 191 case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */ 192 case IEEE80211_STATUS_TIMEOUT: 193 case IEEE80211_REASON_ASSOC_EXPIRE: 194 case IEEE80211_REASON_NOT_AUTHED: 195 case IEEE80211_REASON_NOT_ASSOCED: 196 case IEEE80211_REASON_ASSOC_LEAVE: 197 case IEEE80211_REASON_ASSOC_NOT_AUTHED: 198 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); 199 break; 200 default: 201 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason); 202 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 203 ieee80211_check_scan_current(vap); 204 break; 205 } 206 } 207 208 static void 209 sta_swbmiss_start(struct ieee80211vap *vap) 210 { 211 212 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) { 213 /* 214 * Start s/w beacon miss timer for devices w/o 215 * hardware support. We fudge a bit here since 216 * we're doing this in software. 217 */ 218 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS( 219 2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval); 220 vap->iv_swbmiss_count = 0; 221 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period, 222 ieee80211_swbmiss, vap); 223 } 224 } 225 226 /* 227 * IEEE80211_M_STA vap state machine handler. 228 * This routine handles the main states in the 802.11 protocol. 229 */ 230 static int 231 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 232 { 233 struct ieee80211com *ic = vap->iv_ic; 234 struct ieee80211_node *ni; 235 enum ieee80211_state ostate; 236 237 IEEE80211_LOCK_ASSERT(ic); 238 239 ostate = vap->iv_state; 240 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 241 __func__, ieee80211_state_name[ostate], 242 ieee80211_state_name[nstate], arg); 243 vap->iv_state = nstate; /* state transition */ 244 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 245 if (ostate != IEEE80211_S_SCAN) 246 ieee80211_cancel_scan(vap); /* background scan */ 247 ni = vap->iv_bss; /* NB: no reference held */ 248 if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) 249 callout_stop(&vap->iv_swbmiss); 250 switch (nstate) { 251 case IEEE80211_S_INIT: 252 switch (ostate) { 253 case IEEE80211_S_SLEEP: 254 /* XXX wakeup */ 255 /* XXX driver hook to wakeup the hardware? */ 256 case IEEE80211_S_RUN: 257 IEEE80211_SEND_MGMT(ni, 258 IEEE80211_FC0_SUBTYPE_DISASSOC, 259 IEEE80211_REASON_ASSOC_LEAVE); 260 ieee80211_sta_leave(ni); 261 break; 262 case IEEE80211_S_ASSOC: 263 IEEE80211_SEND_MGMT(ni, 264 IEEE80211_FC0_SUBTYPE_DEAUTH, 265 IEEE80211_REASON_AUTH_LEAVE); 266 break; 267 case IEEE80211_S_SCAN: 268 ieee80211_cancel_scan(vap); 269 break; 270 default: 271 break; 272 } 273 if (ostate != IEEE80211_S_INIT) { 274 /* NB: optimize INIT -> INIT case */ 275 ieee80211_reset_bss(vap); 276 } 277 if (vap->iv_auth->ia_detach != NULL) 278 vap->iv_auth->ia_detach(vap); 279 break; 280 case IEEE80211_S_SCAN: 281 switch (ostate) { 282 case IEEE80211_S_INIT: 283 /* 284 * Initiate a scan. We can come here as a result 285 * of an IEEE80211_IOC_SCAN_REQ too in which case 286 * the vap will be marked with IEEE80211_FEXT_SCANREQ 287 * and the scan request parameters will be present 288 * in iv_scanreq. Otherwise we do the default. 289 */ 290 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 291 ieee80211_check_scan(vap, 292 vap->iv_scanreq_flags, 293 vap->iv_scanreq_duration, 294 vap->iv_scanreq_mindwell, 295 vap->iv_scanreq_maxdwell, 296 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 297 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 298 } else 299 ieee80211_check_scan_current(vap); 300 break; 301 case IEEE80211_S_SCAN: 302 case IEEE80211_S_AUTH: 303 case IEEE80211_S_ASSOC: 304 /* 305 * These can happen either because of a timeout 306 * on an assoc/auth response or because of a 307 * change in state that requires a reset. For 308 * the former we're called with a non-zero arg 309 * that is the cause for the failure; pass this 310 * to the scan code so it can update state. 311 * Otherwise trigger a new scan unless we're in 312 * manual roaming mode in which case an application 313 * must issue an explicit scan request. 314 */ 315 if (arg != 0) 316 ieee80211_scan_assoc_fail(vap, 317 vap->iv_bss->ni_macaddr, arg); 318 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 319 ieee80211_check_scan_current(vap); 320 break; 321 case IEEE80211_S_SLEEP: /* beacon miss */ 322 /* 323 * XXX if in sleep we need to wakeup the hardware. 324 */ 325 /* FALLTHROUGH */ 326 case IEEE80211_S_RUN: /* beacon miss */ 327 /* 328 * Beacon miss. Notify user space and if not 329 * under control of a user application (roaming 330 * manual) kick off a scan to re-connect. 331 */ 332 333 ieee80211_sta_leave(ni); 334 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 335 ieee80211_check_scan_current(vap); 336 break; 337 default: 338 goto invalid; 339 } 340 break; 341 case IEEE80211_S_AUTH: 342 switch (ostate) { 343 case IEEE80211_S_INIT: 344 case IEEE80211_S_SCAN: 345 IEEE80211_SEND_MGMT(ni, 346 IEEE80211_FC0_SUBTYPE_AUTH, 1); 347 break; 348 case IEEE80211_S_AUTH: 349 case IEEE80211_S_ASSOC: 350 switch (arg & 0xff) { 351 case IEEE80211_FC0_SUBTYPE_AUTH: 352 /* ??? */ 353 IEEE80211_SEND_MGMT(ni, 354 IEEE80211_FC0_SUBTYPE_AUTH, 2); 355 break; 356 case IEEE80211_FC0_SUBTYPE_DEAUTH: 357 sta_authretry(vap, ni, arg>>8); 358 break; 359 } 360 break; 361 case IEEE80211_S_SLEEP: 362 case IEEE80211_S_RUN: 363 switch (arg & 0xff) { 364 case IEEE80211_FC0_SUBTYPE_AUTH: 365 IEEE80211_SEND_MGMT(ni, 366 IEEE80211_FC0_SUBTYPE_AUTH, 2); 367 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */ 368 break; 369 case IEEE80211_FC0_SUBTYPE_DEAUTH: 370 ieee80211_sta_leave(ni); 371 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 372 /* try to reauth */ 373 IEEE80211_SEND_MGMT(ni, 374 IEEE80211_FC0_SUBTYPE_AUTH, 1); 375 } 376 break; 377 } 378 break; 379 default: 380 goto invalid; 381 } 382 break; 383 case IEEE80211_S_ASSOC: 384 switch (ostate) { 385 case IEEE80211_S_AUTH: 386 case IEEE80211_S_ASSOC: 387 IEEE80211_SEND_MGMT(ni, 388 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 389 break; 390 case IEEE80211_S_SLEEP: /* cannot happen */ 391 case IEEE80211_S_RUN: 392 ieee80211_sta_leave(ni); 393 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) { 394 IEEE80211_SEND_MGMT(ni, arg ? 395 IEEE80211_FC0_SUBTYPE_REASSOC_REQ : 396 IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); 397 } 398 break; 399 default: 400 goto invalid; 401 } 402 break; 403 case IEEE80211_S_RUN: 404 if (vap->iv_flags & IEEE80211_F_WPA) { 405 /* XXX validate prerequisites */ 406 } 407 switch (ostate) { 408 case IEEE80211_S_RUN: 409 case IEEE80211_S_CSA: 410 break; 411 case IEEE80211_S_AUTH: /* when join is done in fw */ 412 case IEEE80211_S_ASSOC: 413 #ifdef IEEE80211_DEBUG 414 if (ieee80211_msg_debug(vap)) { 415 ieee80211_note(vap, "%s with %s ssid ", 416 (vap->iv_opmode == IEEE80211_M_STA ? 417 "associated" : "synchronized"), 418 ether_sprintf(ni->ni_bssid)); 419 ieee80211_print_essid(vap->iv_bss->ni_essid, 420 ni->ni_esslen); 421 /* XXX MCS/HT */ 422 printf(" channel %d start %uMb\n", 423 ieee80211_chan2ieee(ic, ic->ic_curchan), 424 IEEE80211_RATE2MBS(ni->ni_txrate)); 425 } 426 #endif 427 ieee80211_scan_assoc_success(vap, ni->ni_macaddr); 428 ieee80211_notify_node_join(ni, 429 arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP); 430 break; 431 case IEEE80211_S_SLEEP: 432 /* Wake up from sleep */ 433 vap->iv_sta_ps(vap, 0); 434 break; 435 default: 436 goto invalid; 437 } 438 ieee80211_sync_curchan(ic); 439 if (ostate != IEEE80211_S_RUN) 440 sta_swbmiss_start(vap); 441 /* 442 * When 802.1x is not in use mark the port authorized 443 * at this point so traffic can flow. 444 */ 445 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 446 ieee80211_node_authorize(ni); 447 /* 448 * Fake association when joining an existing bss. 449 * 450 * Don't do this if we're doing SLEEP->RUN. 451 */ 452 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP) 453 ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN)); 454 break; 455 case IEEE80211_S_CSA: 456 if (ostate != IEEE80211_S_RUN) 457 goto invalid; 458 break; 459 case IEEE80211_S_SLEEP: 460 sta_swbmiss_start(vap); 461 vap->iv_sta_ps(vap, 1); 462 break; 463 default: 464 invalid: 465 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 466 "%s: unexpected state transition %s -> %s\n", __func__, 467 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 468 break; 469 } 470 return 0; 471 } 472 473 /* 474 * Return non-zero if the frame is an echo of a multicast 475 * frame sent by ourself. The dir is known to be DSTODS. 476 */ 477 static __inline int 478 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 479 { 480 #define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh) 481 #define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh) 482 const uint8_t *sa; 483 484 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 485 486 if (!IEEE80211_IS_MULTICAST(wh->i_addr3)) 487 return 0; 488 sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4; 489 return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr); 490 #undef WH4 491 #undef QWH4 492 } 493 494 /* 495 * Return non-zero if the frame is an echo of a multicast 496 * frame sent by ourself. The dir is known to be FROMDS. 497 */ 498 static __inline int 499 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh) 500 { 501 KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode")); 502 503 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 504 return 0; 505 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr); 506 } 507 508 /* 509 * Decide if a received management frame should be 510 * printed when debugging is enabled. This filters some 511 * of the less interesting frames that come frequently 512 * (e.g. beacons). 513 */ 514 static __inline int 515 doprint(struct ieee80211vap *vap, int subtype) 516 { 517 switch (subtype) { 518 case IEEE80211_FC0_SUBTYPE_BEACON: 519 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 520 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 521 return 0; 522 } 523 return 1; 524 } 525 526 /* 527 * Process a received frame. The node associated with the sender 528 * should be supplied. If nothing was found in the node table then 529 * the caller is assumed to supply a reference to iv_bss instead. 530 * The RSSI and a timestamp are also supplied. The RSSI data is used 531 * during AP scanning to select a AP to associate with; it can have 532 * any units so long as values have consistent units and higher values 533 * mean ``better signal''. The receive timestamp is currently not used 534 * by the 802.11 layer. 535 */ 536 static int 537 sta_input(struct ieee80211_node *ni, struct mbuf *m, 538 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 539 { 540 struct ieee80211vap *vap = ni->ni_vap; 541 struct ieee80211com *ic = ni->ni_ic; 542 struct ifnet *ifp = vap->iv_ifp; 543 struct ieee80211_frame *wh; 544 struct ieee80211_key *key; 545 struct ether_header *eh; 546 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 547 uint8_t dir, type, subtype, qos; 548 uint8_t *bssid; 549 int is_hw_decrypted = 0; 550 int has_decrypted = 0; 551 552 /* 553 * Some devices do hardware decryption all the way through 554 * to pretending the frame wasn't encrypted in the first place. 555 * So, tag it appropriately so it isn't discarded inappropriately. 556 */ 557 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 558 is_hw_decrypted = 1; 559 560 if (m->m_flags & M_AMPDU_MPDU) { 561 /* 562 * Fastpath for A-MPDU reorder q resubmission. Frames 563 * w/ M_AMPDU_MPDU marked have already passed through 564 * here but were received out of order and been held on 565 * the reorder queue. When resubmitted they are marked 566 * with the M_AMPDU_MPDU flag and we can bypass most of 567 * the normal processing. 568 */ 569 wh = mtod(m, struct ieee80211_frame *); 570 type = IEEE80211_FC0_TYPE_DATA; 571 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 572 subtype = IEEE80211_FC0_SUBTYPE_QOS; 573 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 574 goto resubmit_ampdu; 575 } 576 577 KASSERT(ni != NULL, ("null node")); 578 ni->ni_inact = ni->ni_inact_reload; 579 580 type = -1; /* undefined */ 581 582 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 583 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 584 ni->ni_macaddr, NULL, 585 "too short (1): len %u", m->m_pkthdr.len); 586 vap->iv_stats.is_rx_tooshort++; 587 goto out; 588 } 589 /* 590 * Bit of a cheat here, we use a pointer for a 3-address 591 * frame format but don't reference fields past outside 592 * ieee80211_frame_min w/o first validating the data is 593 * present. 594 */ 595 wh = mtod(m, struct ieee80211_frame *); 596 597 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 598 IEEE80211_FC0_VERSION_0) { 599 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 600 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 601 wh->i_fc[0], wh->i_fc[1]); 602 vap->iv_stats.is_rx_badversion++; 603 goto err; 604 } 605 606 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 607 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 608 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 609 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 610 bssid = wh->i_addr2; 611 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { 612 /* not interested in */ 613 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 614 bssid, NULL, "%s", "not to bss"); 615 vap->iv_stats.is_rx_wrongbss++; 616 goto out; 617 } 618 619 /* 620 * Some devices may be in a promiscuous mode 621 * where they receive frames for multiple station 622 * addresses. 623 * 624 * If we receive a data frame that isn't 625 * destined to our VAP MAC, drop it. 626 * 627 * XXX TODO: This is only enforced when not scanning; 628 * XXX it assumes a software-driven scan will put the NIC 629 * XXX into a "no data frames" mode before setting this 630 * XXX flag. Otherwise it may be possible that we'll still 631 * XXX process data frames whilst scanning. 632 */ 633 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) 634 && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) { 635 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 636 bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D", 637 IF_LLADDR(ifp), ":", wh->i_addr1, ":"); 638 vap->iv_stats.is_rx_wrongbss++; 639 goto out; 640 } 641 642 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 643 ni->ni_noise = nf; 644 if ( IEEE80211_HAS_SEQ(type, subtype) && 645 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 646 uint8_t tid = ieee80211_gettid(wh); 647 if (IEEE80211_QOS_HAS_SEQ(wh) && 648 TID_TO_WME_AC(tid) >= WME_AC_VI) 649 ic->ic_wme.wme_hipri_traffic++; 650 if (! ieee80211_check_rxseq(ni, wh, bssid)) 651 goto out; 652 } 653 } 654 655 switch (type) { 656 case IEEE80211_FC0_TYPE_DATA: 657 hdrspace = ieee80211_hdrspace(ic, wh); 658 if (m->m_len < hdrspace && 659 (m = m_pullup(m, hdrspace)) == NULL) { 660 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 661 ni->ni_macaddr, NULL, 662 "data too short: expecting %u", hdrspace); 663 vap->iv_stats.is_rx_tooshort++; 664 goto out; /* XXX */ 665 } 666 /* 667 * Handle A-MPDU re-ordering. If the frame is to be 668 * processed directly then ieee80211_ampdu_reorder 669 * will return 0; otherwise it has consumed the mbuf 670 * and we should do nothing more with it. 671 */ 672 if ((m->m_flags & M_AMPDU) && 673 (dir == IEEE80211_FC1_DIR_FROMDS || 674 dir == IEEE80211_FC1_DIR_DSTODS) && 675 ieee80211_ampdu_reorder(ni, m) != 0) { 676 m = NULL; 677 goto out; 678 } 679 resubmit_ampdu: 680 if (dir == IEEE80211_FC1_DIR_FROMDS) { 681 if ((ifp->if_flags & IFF_SIMPLEX) && 682 isfromds_mcastecho(vap, wh)) { 683 /* 684 * In IEEE802.11 network, multicast 685 * packets sent from "me" are broadcast 686 * from the AP; silently discard for 687 * SIMPLEX interface. 688 */ 689 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 690 wh, "data", "%s", "multicast echo"); 691 vap->iv_stats.is_rx_mcastecho++; 692 goto out; 693 } 694 if ((vap->iv_flags & IEEE80211_F_DWDS) && 695 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 696 /* 697 * DWDS sta's must drop 3-address mcast frames 698 * as they will be sent separately as a 4-addr 699 * frame. Accepting the 3-addr frame will 700 * confuse the bridge into thinking the sending 701 * sta is located at the end of WDS link. 702 */ 703 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 704 "3-address data", "%s", "DWDS enabled"); 705 vap->iv_stats.is_rx_mcastecho++; 706 goto out; 707 } 708 } else if (dir == IEEE80211_FC1_DIR_DSTODS) { 709 if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) { 710 IEEE80211_DISCARD(vap, 711 IEEE80211_MSG_INPUT, wh, "4-address data", 712 "%s", "DWDS not enabled"); 713 vap->iv_stats.is_rx_wrongdir++; 714 goto out; 715 } 716 if ((ifp->if_flags & IFF_SIMPLEX) && 717 isdstods_mcastecho(vap, wh)) { 718 /* 719 * In IEEE802.11 network, multicast 720 * packets sent from "me" are broadcast 721 * from the AP; silently discard for 722 * SIMPLEX interface. 723 */ 724 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 725 "4-address data", "%s", "multicast echo"); 726 vap->iv_stats.is_rx_mcastecho++; 727 goto out; 728 } 729 } else { 730 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh, 731 "data", "incorrect dir 0x%x", dir); 732 vap->iv_stats.is_rx_wrongdir++; 733 goto out; 734 } 735 736 /* 737 * Handle privacy requirements for hardware decryption 738 * devices. 739 * 740 * For those devices, a handful of things happen. 741 * 742 * + If IV has been stripped, then we can't run 743 * ieee80211_crypto_decap() - none of the key 744 * + If MIC has been stripped, we can't validate 745 * MIC here. 746 * + If MIC fails, then we need to communicate a 747 * MIC failure up to the stack - but we don't know 748 * which key was used. 749 */ 750 751 /* 752 * Handle privacy requirements. Note that we 753 * must not be preempted from here until after 754 * we (potentially) call ieee80211_crypto_demic; 755 * otherwise we may violate assumptions in the 756 * crypto cipher modules used to do delayed update 757 * of replay sequence numbers. 758 */ 759 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 760 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 761 /* 762 * Discard encrypted frames when privacy is off. 763 */ 764 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 765 wh, "WEP", "%s", "PRIVACY off"); 766 vap->iv_stats.is_rx_noprivacy++; 767 IEEE80211_NODE_STAT(ni, rx_noprivacy); 768 goto out; 769 } 770 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 771 /* NB: stats+msgs handled in crypto_decap */ 772 IEEE80211_NODE_STAT(ni, rx_wepfail); 773 goto out; 774 } 775 wh = mtod(m, struct ieee80211_frame *); 776 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 777 has_decrypted = 1; 778 } else { 779 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 780 key = NULL; 781 } 782 783 /* 784 * Save QoS bits for use below--before we strip the header. 785 */ 786 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 787 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 788 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 789 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 790 } else 791 qos = 0; 792 793 /* 794 * Next up, any fragmentation. 795 */ 796 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 797 m = ieee80211_defrag(ni, m, hdrspace); 798 if (m == NULL) { 799 /* Fragment dropped or frame not complete yet */ 800 goto out; 801 } 802 } 803 wh = NULL; /* no longer valid, catch any uses */ 804 805 /* 806 * Next strip any MSDU crypto bits. 807 * 808 * Note: we can't do MIC stripping/verification if the 809 * upper layer has stripped it. We have to check MIC 810 * ourselves. So, key may be NULL, but we have to check 811 * the RX status. 812 */ 813 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 814 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 815 ni->ni_macaddr, "data", "%s", "demic error"); 816 vap->iv_stats.is_rx_demicfail++; 817 IEEE80211_NODE_STAT(ni, rx_demicfail); 818 goto out; 819 } 820 821 /* copy to listener after decrypt */ 822 if (ieee80211_radiotap_active_vap(vap)) 823 ieee80211_radiotap_rx(vap, m); 824 need_tap = 0; 825 826 /* 827 * Finally, strip the 802.11 header. 828 */ 829 m = ieee80211_decap(vap, m, hdrspace); 830 if (m == NULL) { 831 /* XXX mask bit to check for both */ 832 /* don't count Null data frames as errors */ 833 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 834 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 835 goto out; 836 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 837 ni->ni_macaddr, "data", "%s", "decap error"); 838 vap->iv_stats.is_rx_decap++; 839 IEEE80211_NODE_STAT(ni, rx_decap); 840 goto err; 841 } 842 eh = mtod(m, struct ether_header *); 843 if (!ieee80211_node_is_authorized(ni)) { 844 /* 845 * Deny any non-PAE frames received prior to 846 * authorization. For open/shared-key 847 * authentication the port is mark authorized 848 * after authentication completes. For 802.1x 849 * the port is not marked authorized by the 850 * authenticator until the handshake has completed. 851 */ 852 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 853 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 854 eh->ether_shost, "data", 855 "unauthorized port: ether type 0x%x len %u", 856 eh->ether_type, m->m_pkthdr.len); 857 vap->iv_stats.is_rx_unauth++; 858 IEEE80211_NODE_STAT(ni, rx_unauth); 859 goto err; 860 } 861 } else { 862 /* 863 * When denying unencrypted frames, discard 864 * any non-PAE frames received without encryption. 865 */ 866 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 867 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 868 (is_hw_decrypted == 0) && 869 eh->ether_type != htons(ETHERTYPE_PAE)) { 870 /* 871 * Drop unencrypted frames. 872 */ 873 vap->iv_stats.is_rx_unencrypted++; 874 IEEE80211_NODE_STAT(ni, rx_unencrypted); 875 goto out; 876 } 877 } 878 /* XXX require HT? */ 879 if (qos & IEEE80211_QOS_AMSDU) { 880 m = ieee80211_decap_amsdu(ni, m); 881 if (m == NULL) 882 return IEEE80211_FC0_TYPE_DATA; 883 } else { 884 #ifdef IEEE80211_SUPPORT_SUPERG 885 m = ieee80211_decap_fastframe(vap, ni, m); 886 if (m == NULL) 887 return IEEE80211_FC0_TYPE_DATA; 888 #endif 889 } 890 ieee80211_deliver_data(vap, ni, m); 891 return IEEE80211_FC0_TYPE_DATA; 892 893 case IEEE80211_FC0_TYPE_MGT: 894 vap->iv_stats.is_rx_mgmt++; 895 IEEE80211_NODE_STAT(ni, rx_mgmt); 896 if (dir != IEEE80211_FC1_DIR_NODS) { 897 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 898 wh, "data", "incorrect dir 0x%x", dir); 899 vap->iv_stats.is_rx_wrongdir++; 900 goto err; 901 } 902 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 903 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 904 ni->ni_macaddr, "mgt", "too short: len %u", 905 m->m_pkthdr.len); 906 vap->iv_stats.is_rx_tooshort++; 907 goto out; 908 } 909 #ifdef IEEE80211_DEBUG 910 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 911 ieee80211_msg_dumppkts(vap)) { 912 if_printf(ifp, "received %s from %s rssi %d\n", 913 ieee80211_mgt_subtype_name(subtype), 914 ether_sprintf(wh->i_addr2), rssi); 915 } 916 #endif 917 918 /* 919 * Note: See above for hardware offload privacy requirements. 920 * It also applies here. 921 */ 922 923 /* 924 * Again, having encrypted flag set check would be good, but 925 * then we have to also handle crypto_decap() like above. 926 */ 927 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 928 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 929 /* 930 * Only shared key auth frames with a challenge 931 * should be encrypted, discard all others. 932 */ 933 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 934 wh, ieee80211_mgt_subtype_name(subtype), 935 "%s", "WEP set but not permitted"); 936 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 937 goto out; 938 } 939 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 940 /* 941 * Discard encrypted frames when privacy is off. 942 */ 943 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 944 wh, "mgt", "%s", "WEP set but PRIVACY off"); 945 vap->iv_stats.is_rx_noprivacy++; 946 goto out; 947 } 948 hdrspace = ieee80211_hdrspace(ic, wh); 949 950 /* 951 * Again, if IV/MIC was stripped, then this whole 952 * setup will fail. That's going to need some poking. 953 */ 954 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 955 /* NB: stats+msgs handled in crypto_decap */ 956 goto out; 957 } 958 has_decrypted = 1; 959 wh = mtod(m, struct ieee80211_frame *); 960 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 961 } 962 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 963 goto out; 964 965 case IEEE80211_FC0_TYPE_CTL: 966 vap->iv_stats.is_rx_ctl++; 967 IEEE80211_NODE_STAT(ni, rx_ctrl); 968 vap->iv_recv_ctl(ni, m, subtype); 969 goto out; 970 971 default: 972 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 973 wh, NULL, "bad frame type 0x%x", type); 974 /* should not come here */ 975 break; 976 } 977 err: 978 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 979 out: 980 if (m != NULL) { 981 if (need_tap && ieee80211_radiotap_active_vap(vap)) 982 ieee80211_radiotap_rx(vap, m); 983 m_freem(m); 984 } 985 return type; 986 } 987 988 static void 989 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 990 int rssi, int nf, uint16_t seq, uint16_t status) 991 { 992 struct ieee80211vap *vap = ni->ni_vap; 993 994 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 995 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 996 ni->ni_macaddr, "open auth", 997 "bad sta auth mode %u", ni->ni_authmode); 998 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 999 return; 1000 } 1001 if (vap->iv_state != IEEE80211_S_AUTH || 1002 seq != IEEE80211_AUTH_OPEN_RESPONSE) { 1003 vap->iv_stats.is_rx_bad_auth++; 1004 return; 1005 } 1006 if (status != 0) { 1007 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1008 ni, "open auth failed (reason %d)", status); 1009 vap->iv_stats.is_rx_auth_fail++; 1010 vap->iv_stats.is_rx_authfail_code = status; 1011 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1012 IEEE80211_SCAN_FAIL_STATUS); 1013 } else 1014 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1015 } 1016 1017 static void 1018 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1019 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1020 uint16_t seq, uint16_t status) 1021 { 1022 struct ieee80211vap *vap = ni->ni_vap; 1023 uint8_t *challenge; 1024 1025 /* 1026 * NB: this can happen as we allow pre-shared key 1027 * authentication to be enabled w/o wep being turned 1028 * on so that configuration of these can be done 1029 * in any order. It may be better to enforce the 1030 * ordering in which case this check would just be 1031 * for sanity/consistency. 1032 */ 1033 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1034 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1035 ni->ni_macaddr, "shared key auth", 1036 "%s", " PRIVACY is disabled"); 1037 goto bad; 1038 } 1039 /* 1040 * Pre-shared key authentication is evil; accept 1041 * it only if explicitly configured (it is supported 1042 * mainly for compatibility with clients like OS X). 1043 */ 1044 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1045 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1046 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1047 ni->ni_macaddr, "shared key auth", 1048 "bad sta auth mode %u", ni->ni_authmode); 1049 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1050 goto bad; 1051 } 1052 1053 challenge = NULL; 1054 if (frm + 1 < efrm) { 1055 if ((frm[1] + 2) > (efrm - frm)) { 1056 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1057 ni->ni_macaddr, "shared key auth", 1058 "ie %d/%d too long", 1059 frm[0], (frm[1] + 2) - (efrm - frm)); 1060 vap->iv_stats.is_rx_bad_auth++; 1061 goto bad; 1062 } 1063 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1064 challenge = frm; 1065 frm += frm[1] + 2; 1066 } 1067 switch (seq) { 1068 case IEEE80211_AUTH_SHARED_CHALLENGE: 1069 case IEEE80211_AUTH_SHARED_RESPONSE: 1070 if (challenge == NULL) { 1071 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1072 ni->ni_macaddr, "shared key auth", 1073 "%s", "no challenge"); 1074 vap->iv_stats.is_rx_bad_auth++; 1075 goto bad; 1076 } 1077 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1078 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1079 ni->ni_macaddr, "shared key auth", 1080 "bad challenge len %d", challenge[1]); 1081 vap->iv_stats.is_rx_bad_auth++; 1082 goto bad; 1083 } 1084 default: 1085 break; 1086 } 1087 if (vap->iv_state != IEEE80211_S_AUTH) 1088 return; 1089 switch (seq) { 1090 case IEEE80211_AUTH_SHARED_PASS: 1091 if (ni->ni_challenge != NULL) { 1092 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 1093 ni->ni_challenge = NULL; 1094 } 1095 if (status != 0) { 1096 IEEE80211_NOTE_FRAME(vap, 1097 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh, 1098 "shared key auth failed (reason %d)", status); 1099 vap->iv_stats.is_rx_auth_fail++; 1100 vap->iv_stats.is_rx_authfail_code = status; 1101 return; 1102 } 1103 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1104 break; 1105 case IEEE80211_AUTH_SHARED_CHALLENGE: 1106 if (!ieee80211_alloc_challenge(ni)) 1107 return; 1108 /* XXX could optimize by passing recvd challenge */ 1109 memcpy(ni->ni_challenge, &challenge[2], challenge[1]); 1110 IEEE80211_SEND_MGMT(ni, 1111 IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1112 break; 1113 default: 1114 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH, 1115 wh, "shared key auth", "bad seq %d", seq); 1116 vap->iv_stats.is_rx_bad_auth++; 1117 return; 1118 } 1119 return; 1120 bad: 1121 /* 1122 * Kick the state machine. This short-circuits 1123 * using the mgt frame timeout to trigger the 1124 * state transition. 1125 */ 1126 if (vap->iv_state == IEEE80211_S_AUTH) 1127 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1128 IEEE80211_SCAN_FAIL_STATUS); 1129 } 1130 1131 int 1132 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm, 1133 const struct ieee80211_frame *wh) 1134 { 1135 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 1136 struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme; 1137 u_int len = frm[1], qosinfo; 1138 int i; 1139 1140 if (len < sizeof(struct ieee80211_wme_param)-2) { 1141 IEEE80211_DISCARD_IE(vap, 1142 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, 1143 wh, "WME", "too short, len %u", len); 1144 return -1; 1145 } 1146 qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; 1147 qosinfo &= WME_QOSINFO_COUNT; 1148 /* XXX do proper check for wraparound */ 1149 if (qosinfo == wme->wme_wmeChanParams.cap_info) 1150 return 0; 1151 frm += __offsetof(struct ieee80211_wme_param, params_acParams); 1152 for (i = 0; i < WME_NUM_AC; i++) { 1153 struct wmeParams *wmep = 1154 &wme->wme_wmeChanParams.cap_wmeParams[i]; 1155 /* NB: ACI not used */ 1156 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); 1157 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); 1158 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); 1159 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); 1160 wmep->wmep_txopLimit = le16dec(frm+2); 1161 frm += 4; 1162 } 1163 wme->wme_wmeChanParams.cap_info = qosinfo; 1164 return 1; 1165 #undef MS 1166 } 1167 1168 /* 1169 * Process 11h Channel Switch Announcement (CSA) ie. If this 1170 * is the first CSA then initiate the switch. Otherwise we 1171 * track state and trigger completion and/or cancel of the switch. 1172 * XXX should be public for IBSS use 1173 */ 1174 static void 1175 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm, 1176 const struct ieee80211_frame *wh) 1177 { 1178 struct ieee80211com *ic = vap->iv_ic; 1179 const struct ieee80211_csa_ie *csa = 1180 (const struct ieee80211_csa_ie *) frm; 1181 1182 KASSERT(vap->iv_state >= IEEE80211_S_RUN, 1183 ("state %s", ieee80211_state_name[vap->iv_state])); 1184 1185 if (csa->csa_mode > 1) { 1186 IEEE80211_DISCARD_IE(vap, 1187 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1188 wh, "CSA", "invalid mode %u", csa->csa_mode); 1189 return; 1190 } 1191 IEEE80211_LOCK(ic); 1192 if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) { 1193 /* 1194 * Convert the channel number to a channel reference. We 1195 * try first to preserve turbo attribute of the current 1196 * channel then fallback. Note this will not work if the 1197 * CSA specifies a channel that requires a band switch (e.g. 1198 * 11a => 11g). This is intentional as 11h is defined only 1199 * for 5GHz/11a and because the switch does not involve a 1200 * reassociation, protocol state (capabilities, negotated 1201 * rates, etc) may/will be wrong. 1202 */ 1203 struct ieee80211_channel *c = 1204 ieee80211_find_channel_byieee(ic, csa->csa_newchan, 1205 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO)); 1206 if (c == NULL) { 1207 c = ieee80211_find_channel_byieee(ic, 1208 csa->csa_newchan, 1209 (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL)); 1210 if (c == NULL) { 1211 IEEE80211_DISCARD_IE(vap, 1212 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1213 wh, "CSA", "invalid channel %u", 1214 csa->csa_newchan); 1215 goto done; 1216 } 1217 } 1218 #if IEEE80211_CSA_COUNT_MIN > 0 1219 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) { 1220 /* 1221 * Require at least IEEE80211_CSA_COUNT_MIN count to 1222 * reduce the risk of being redirected by a fabricated 1223 * CSA. If a valid CSA is dropped we'll still get a 1224 * beacon miss when the AP leaves the channel so we'll 1225 * eventually follow to the new channel. 1226 * 1227 * NOTE: this violates the 11h spec that states that 1228 * count may be any value and if 0 then a switch 1229 * should happen asap. 1230 */ 1231 IEEE80211_DISCARD_IE(vap, 1232 IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH, 1233 wh, "CSA", "count %u too small, must be >= %u", 1234 csa->csa_count, IEEE80211_CSA_COUNT_MIN); 1235 goto done; 1236 } 1237 #endif 1238 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count); 1239 } else { 1240 /* 1241 * Validate this ie against the initial CSA. We require 1242 * mode and channel not change and the count must be 1243 * monotonically decreasing. This may be pointless and 1244 * canceling the switch as a result may be too paranoid but 1245 * in the worst case if we drop out of CSA because of this 1246 * and the AP does move then we'll just end up taking a 1247 * beacon miss and scan to find the AP. 1248 * 1249 * XXX may want <= on count as we also process ProbeResp 1250 * frames and those may come in w/ the same count as the 1251 * previous beacon; but doing so leaves us open to a stuck 1252 * count until we add a dead-man timer 1253 */ 1254 if (!(csa->csa_count < ic->ic_csa_count && 1255 csa->csa_mode == ic->ic_csa_mode && 1256 csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) { 1257 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh, 1258 "CSA ie mismatch, initial ie <%d,%d,%d>, " 1259 "this ie <%d,%d,%d>", ic->ic_csa_mode, 1260 ic->ic_csa_newchan, ic->ic_csa_count, 1261 csa->csa_mode, csa->csa_newchan, csa->csa_count); 1262 ieee80211_csa_cancelswitch(ic); 1263 } else { 1264 if (csa->csa_count <= 1) 1265 ieee80211_csa_completeswitch(ic); 1266 else 1267 ic->ic_csa_count = csa->csa_count; 1268 } 1269 } 1270 done: 1271 IEEE80211_UNLOCK(ic); 1272 } 1273 1274 /* 1275 * Return non-zero if a background scan may be continued: 1276 * o bg scan is active 1277 * o no channel switch is pending 1278 * o there has not been any traffic recently 1279 * o no full-offload scan support (no need for explicitly continuing scan then) 1280 * 1281 * Note we do not check if there is an administrative enable; 1282 * this is only done to start the scan. We assume that any 1283 * change in state will be accompanied by a request to cancel 1284 * active scans which will otherwise cause this test to fail. 1285 */ 1286 static __inline int 1287 contbgscan(struct ieee80211vap *vap) 1288 { 1289 struct ieee80211com *ic = vap->iv_ic; 1290 1291 return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && 1292 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1293 !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) && 1294 vap->iv_state == IEEE80211_S_RUN && /* XXX? */ 1295 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)); 1296 } 1297 1298 /* 1299 * Return non-zero if a backgrond scan may be started: 1300 * o bg scanning is administratively enabled 1301 * o no channel switch is pending 1302 * o we are not boosted on a dynamic turbo channel 1303 * o there has not been a scan recently 1304 * o there has not been any traffic recently (don't check if full-offload scan) 1305 */ 1306 static __inline int 1307 startbgscan(struct ieee80211vap *vap) 1308 { 1309 struct ieee80211com *ic = vap->iv_ic; 1310 1311 return ((vap->iv_flags & IEEE80211_F_BGSCAN) && 1312 (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 && 1313 #ifdef IEEE80211_SUPPORT_SUPERG 1314 !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && 1315 #endif 1316 ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) && 1317 ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) || 1318 ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle))); 1319 } 1320 1321 static void 1322 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 1323 const struct ieee80211_rx_stats *rxs, 1324 int rssi, int nf) 1325 { 1326 #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) 1327 struct ieee80211vap *vap = ni->ni_vap; 1328 struct ieee80211com *ic = ni->ni_ic; 1329 struct ieee80211_channel *rxchan = ic->ic_curchan; 1330 struct ieee80211_frame *wh; 1331 uint8_t *frm, *efrm; 1332 uint8_t *rates, *xrates, *wme, *htcap, *htinfo; 1333 uint8_t rate; 1334 int ht_state_change = 0; 1335 1336 wh = mtod(m0, struct ieee80211_frame *); 1337 frm = (uint8_t *)&wh[1]; 1338 efrm = mtod(m0, uint8_t *) + m0->m_len; 1339 switch (subtype) { 1340 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1341 case IEEE80211_FC0_SUBTYPE_BEACON: { 1342 struct ieee80211_scanparams scan; 1343 struct ieee80211_channel *c; 1344 /* 1345 * We process beacon/probe response frames: 1346 * o when scanning, or 1347 * o station mode when associated (to collect state 1348 * updates such as 802.11g slot time) 1349 * Frames otherwise received are discarded. 1350 */ 1351 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) { 1352 vap->iv_stats.is_rx_mgtdiscard++; 1353 return; 1354 } 1355 1356 /* Override RX channel as appropriate */ 1357 if (rxs != NULL) { 1358 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 1359 if (c != NULL) 1360 rxchan = c; 1361 } 1362 1363 /* XXX probe response in sta mode when !scanning? */ 1364 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) { 1365 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 1366 vap->iv_stats.is_beacon_bad++; 1367 return; 1368 } 1369 1370 /* 1371 * Count frame now that we know it's to be processed. 1372 */ 1373 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1374 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1375 IEEE80211_NODE_STAT(ni, rx_beacons); 1376 } else 1377 IEEE80211_NODE_STAT(ni, rx_proberesp); 1378 /* 1379 * When operating in station mode, check for state updates. 1380 * Be careful to ignore beacons received while doing a 1381 * background scan. We consider only 11g/WMM stuff right now. 1382 */ 1383 if (ni->ni_associd != 0 && 1384 ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || 1385 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { 1386 /* record tsf of last beacon */ 1387 memcpy(ni->ni_tstamp.data, scan.tstamp, 1388 sizeof(ni->ni_tstamp)); 1389 /* count beacon frame for s/w bmiss handling */ 1390 vap->iv_swbmiss_count++; 1391 vap->iv_bmiss_count = 0; 1392 if (ni->ni_erp != scan.erp) { 1393 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1394 wh->i_addr2, 1395 "erp change: was 0x%x, now 0x%x", 1396 ni->ni_erp, scan.erp); 1397 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1398 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1399 ic->ic_flags |= IEEE80211_F_USEPROT; 1400 else 1401 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1402 ni->ni_erp = scan.erp; 1403 /* XXX statistic */ 1404 /* XXX driver notification */ 1405 } 1406 if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { 1407 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1408 wh->i_addr2, 1409 "capabilities change: was 0x%x, now 0x%x", 1410 ni->ni_capinfo, scan.capinfo); 1411 /* 1412 * NB: we assume short preamble doesn't 1413 * change dynamically 1414 */ 1415 ieee80211_set_shortslottime(ic, 1416 IEEE80211_IS_CHAN_A(ic->ic_bsschan) || 1417 (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1418 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) 1419 | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); 1420 /* XXX statistic */ 1421 } 1422 if (scan.wme != NULL && 1423 (ni->ni_flags & IEEE80211_NODE_QOS) && 1424 ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0) 1425 ieee80211_wme_updateparams(vap); 1426 #ifdef IEEE80211_SUPPORT_SUPERG 1427 if (scan.ath != NULL) 1428 ieee80211_parse_athparams(ni, scan.ath, wh); 1429 #endif 1430 if (scan.htcap != NULL && scan.htinfo != NULL && 1431 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1432 /* XXX state changes? */ 1433 if (ieee80211_ht_updateparams(ni, 1434 scan.htcap, scan.htinfo)) 1435 ht_state_change = 1; 1436 } 1437 if (scan.quiet) 1438 ic->ic_set_quiet(ni, scan.quiet); 1439 1440 if (scan.tim != NULL) { 1441 struct ieee80211_tim_ie *tim = 1442 (struct ieee80211_tim_ie *) scan.tim; 1443 /* 1444 * XXX Check/debug this code; see if it's about 1445 * the right time to force the VAP awake if we 1446 * receive a frame destined for us? 1447 */ 1448 int aid = IEEE80211_AID(ni->ni_associd); 1449 int ix = aid / NBBY; 1450 int min = tim->tim_bitctl &~ 1; 1451 int max = tim->tim_len + min - 4; 1452 int tim_ucast = 0, tim_mcast = 0; 1453 1454 /* 1455 * Only do this for unicast traffic in the TIM 1456 * The multicast traffic notification for 1457 * the scan notification stuff should occur 1458 * differently. 1459 */ 1460 if (min <= ix && ix <= max && 1461 isset(tim->tim_bitmap - min, aid)) { 1462 tim_ucast = 1; 1463 } 1464 1465 /* 1466 * Do a separate notification 1467 * for the multicast bit being set. 1468 */ 1469 if (tim->tim_bitctl & 1) { 1470 tim_mcast = 1; 1471 } 1472 1473 /* 1474 * If the TIM indicates there's traffic for 1475 * us then get us out of STA mode powersave. 1476 */ 1477 if (tim_ucast == 1) { 1478 1479 /* 1480 * Wake us out of SLEEP state if we're 1481 * in it; and if we're doing bgscan 1482 * then wake us out of STA powersave. 1483 */ 1484 ieee80211_sta_tim_notify(vap, 1); 1485 1486 /* 1487 * This is preventing us from 1488 * continuing a bgscan; because it 1489 * tricks the contbgscan() 1490 * routine to think there's always 1491 * traffic for us. 1492 * 1493 * I think we need both an RX and 1494 * TX ic_lastdata field. 1495 */ 1496 ic->ic_lastdata = ticks; 1497 } 1498 1499 ni->ni_dtim_count = tim->tim_count; 1500 ni->ni_dtim_period = tim->tim_period; 1501 } 1502 if (scan.csa != NULL && 1503 (vap->iv_flags & IEEE80211_F_DOTH)) 1504 ieee80211_parse_csaparams(vap, scan.csa, wh); 1505 else if (ic->ic_flags & IEEE80211_F_CSAPENDING) { 1506 /* 1507 * No CSA ie or 11h disabled, but a channel 1508 * switch is pending; drop out so we aren't 1509 * stuck in CSA state. If the AP really is 1510 * moving we'll get a beacon miss and scan. 1511 */ 1512 IEEE80211_LOCK(ic); 1513 ieee80211_csa_cancelswitch(ic); 1514 IEEE80211_UNLOCK(ic); 1515 } 1516 /* 1517 * If scanning, pass the info to the scan module. 1518 * Otherwise, check if it's the right time to do 1519 * a background scan. Background scanning must 1520 * be enabled and we must not be operating in the 1521 * turbo phase of dynamic turbo mode. Then, 1522 * it's been a while since the last background 1523 * scan and if no data frames have come through 1524 * recently, kick off a scan. Note that this 1525 * is the mechanism by which a background scan 1526 * is started _and_ continued each time we 1527 * return on-channel to receive a beacon from 1528 * our ap. 1529 */ 1530 if (ic->ic_flags & IEEE80211_F_SCAN) { 1531 ieee80211_add_scan(vap, rxchan, 1532 &scan, wh, subtype, rssi, nf); 1533 } else if (contbgscan(vap)) { 1534 ieee80211_bg_scan(vap, 0); 1535 } else if (startbgscan(vap)) { 1536 vap->iv_stats.is_scan_bg++; 1537 #if 0 1538 /* wakeup if we are sleeing */ 1539 ieee80211_set_pwrsave(vap, 0); 1540 #endif 1541 ieee80211_bg_scan(vap, 0); 1542 } 1543 1544 /* 1545 * Put the station to sleep if we haven't seen 1546 * traffic in a while. 1547 */ 1548 IEEE80211_LOCK(ic); 1549 ieee80211_sta_ps_timer_check(vap); 1550 IEEE80211_UNLOCK(ic); 1551 1552 /* 1553 * If we've had a channel width change (eg HT20<->HT40) 1554 * then schedule a delayed driver notification. 1555 */ 1556 if (ht_state_change) 1557 ieee80211_update_chw(ic); 1558 return; 1559 } 1560 /* 1561 * If scanning, just pass information to the scan module. 1562 */ 1563 if (ic->ic_flags & IEEE80211_F_SCAN) { 1564 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 1565 /* 1566 * Actively scanning a channel marked passive; 1567 * send a probe request now that we know there 1568 * is 802.11 traffic present. 1569 * 1570 * XXX check if the beacon we recv'd gives 1571 * us what we need and suppress the probe req 1572 */ 1573 ieee80211_probe_curchan(vap, 1); 1574 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1575 } 1576 ieee80211_add_scan(vap, rxchan, &scan, wh, 1577 subtype, rssi, nf); 1578 return; 1579 } 1580 break; 1581 } 1582 1583 case IEEE80211_FC0_SUBTYPE_AUTH: { 1584 uint16_t algo, seq, status; 1585 /* 1586 * auth frame format 1587 * [2] algorithm 1588 * [2] sequence 1589 * [2] status 1590 * [tlv*] challenge 1591 */ 1592 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1593 algo = le16toh(*(uint16_t *)frm); 1594 seq = le16toh(*(uint16_t *)(frm + 2)); 1595 status = le16toh(*(uint16_t *)(frm + 4)); 1596 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1597 "recv auth frame with algorithm %d seq %d", algo, seq); 1598 1599 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1600 IEEE80211_DISCARD(vap, 1601 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1602 wh, "auth", "%s", "TKIP countermeasures enabled"); 1603 vap->iv_stats.is_rx_auth_countermeasures++; 1604 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 1605 ieee80211_send_error(ni, wh->i_addr2, 1606 IEEE80211_FC0_SUBTYPE_AUTH, 1607 IEEE80211_REASON_MIC_FAILURE); 1608 } 1609 return; 1610 } 1611 if (algo == IEEE80211_AUTH_ALG_SHARED) 1612 sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1613 seq, status); 1614 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1615 sta_auth_open(ni, wh, rssi, nf, seq, status); 1616 else { 1617 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1618 wh, "auth", "unsupported alg %d", algo); 1619 vap->iv_stats.is_rx_auth_unsupported++; 1620 return; 1621 } 1622 break; 1623 } 1624 1625 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1626 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { 1627 uint16_t capinfo, associd; 1628 uint16_t status; 1629 1630 if (vap->iv_state != IEEE80211_S_ASSOC) { 1631 vap->iv_stats.is_rx_mgtdiscard++; 1632 return; 1633 } 1634 1635 /* 1636 * asresp frame format 1637 * [2] capability information 1638 * [2] status 1639 * [2] association ID 1640 * [tlv] supported rates 1641 * [tlv] extended supported rates 1642 * [tlv] WME 1643 * [tlv] HT capabilities 1644 * [tlv] HT info 1645 */ 1646 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1647 ni = vap->iv_bss; 1648 capinfo = le16toh(*(uint16_t *)frm); 1649 frm += 2; 1650 status = le16toh(*(uint16_t *)frm); 1651 frm += 2; 1652 if (status != 0) { 1653 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1654 wh->i_addr2, "%sassoc failed (reason %d)", 1655 ISREASSOC(subtype) ? "re" : "", status); 1656 vap->iv_stats.is_rx_auth_fail++; /* XXX */ 1657 return; 1658 } 1659 associd = le16toh(*(uint16_t *)frm); 1660 frm += 2; 1661 1662 rates = xrates = wme = htcap = htinfo = NULL; 1663 while (efrm - frm > 1) { 1664 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1665 switch (*frm) { 1666 case IEEE80211_ELEMID_RATES: 1667 rates = frm; 1668 break; 1669 case IEEE80211_ELEMID_XRATES: 1670 xrates = frm; 1671 break; 1672 case IEEE80211_ELEMID_HTCAP: 1673 htcap = frm; 1674 break; 1675 case IEEE80211_ELEMID_HTINFO: 1676 htinfo = frm; 1677 break; 1678 case IEEE80211_ELEMID_VENDOR: 1679 if (iswmeoui(frm)) 1680 wme = frm; 1681 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1682 /* 1683 * Accept pre-draft HT ie's if the 1684 * standard ones have not been seen. 1685 */ 1686 if (ishtcapoui(frm)) { 1687 if (htcap == NULL) 1688 htcap = frm; 1689 } else if (ishtinfooui(frm)) { 1690 if (htinfo == NULL) 1691 htinfo = frm; 1692 } 1693 } 1694 /* XXX Atheros OUI support */ 1695 break; 1696 } 1697 frm += frm[1] + 2; 1698 } 1699 1700 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1701 if (xrates != NULL) 1702 IEEE80211_VERIFY_ELEMENT(xrates, 1703 IEEE80211_RATE_MAXSIZE - rates[1], return); 1704 rate = ieee80211_setup_rates(ni, rates, xrates, 1705 IEEE80211_F_JOIN | 1706 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1707 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1708 if (rate & IEEE80211_RATE_BASIC) { 1709 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC, 1710 wh->i_addr2, 1711 "%sassoc failed (rate set mismatch)", 1712 ISREASSOC(subtype) ? "re" : ""); 1713 vap->iv_stats.is_rx_assoc_norate++; 1714 ieee80211_new_state(vap, IEEE80211_S_SCAN, 1715 IEEE80211_SCAN_FAIL_STATUS); 1716 return; 1717 } 1718 1719 ni->ni_capinfo = capinfo; 1720 ni->ni_associd = associd; 1721 if (ni->ni_jointime == 0) 1722 ni->ni_jointime = time_uptime; 1723 if (wme != NULL && 1724 ieee80211_parse_wmeparams(vap, wme, wh) >= 0) { 1725 ni->ni_flags |= IEEE80211_NODE_QOS; 1726 ieee80211_wme_updateparams(vap); 1727 } else 1728 ni->ni_flags &= ~IEEE80211_NODE_QOS; 1729 /* 1730 * Setup HT state according to the negotiation. 1731 * 1732 * NB: shouldn't need to check if HT use is enabled but some 1733 * ap's send back HT ie's even when we don't indicate we 1734 * are HT capable in our AssocReq. 1735 */ 1736 if (htcap != NULL && htinfo != NULL && 1737 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 1738 ieee80211_ht_node_init(ni); 1739 ieee80211_ht_updateparams(ni, htcap, htinfo); 1740 ieee80211_setup_htrates(ni, htcap, 1741 IEEE80211_F_JOIN | IEEE80211_F_DOBRS); 1742 ieee80211_setup_basic_htrates(ni, htinfo); 1743 ieee80211_node_setuptxparms(ni); 1744 ieee80211_ratectl_node_init(ni); 1745 } 1746 1747 /* 1748 * Always initialise FF/superg state; we can use this 1749 * for doing A-MSDU encapsulation as well. 1750 */ 1751 #ifdef IEEE80211_SUPPORT_SUPERG 1752 ieee80211_ff_node_init(ni); 1753 #endif 1754 1755 /* 1756 * Configure state now that we are associated. 1757 * 1758 * XXX may need different/additional driver callbacks? 1759 */ 1760 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1761 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 1762 ic->ic_flags |= IEEE80211_F_SHPREAMBLE; 1763 ic->ic_flags &= ~IEEE80211_F_USEBARKER; 1764 } else { 1765 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; 1766 ic->ic_flags |= IEEE80211_F_USEBARKER; 1767 } 1768 ieee80211_set_shortslottime(ic, 1769 IEEE80211_IS_CHAN_A(ic->ic_curchan) || 1770 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); 1771 /* 1772 * Honor ERP protection. 1773 * 1774 * NB: ni_erp should zero for non-11g operation. 1775 */ 1776 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1777 (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) 1778 ic->ic_flags |= IEEE80211_F_USEPROT; 1779 else 1780 ic->ic_flags &= ~IEEE80211_F_USEPROT; 1781 IEEE80211_NOTE_MAC(vap, 1782 IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2, 1783 "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s", 1784 ISREASSOC(subtype) ? "re" : "", 1785 IEEE80211_NODE_AID(ni), 1786 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", 1787 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", 1788 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", 1789 ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", 1790 ni->ni_flags & IEEE80211_NODE_HT ? 1791 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "", 1792 ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", 1793 ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" : 1794 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "", 1795 ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "", 1796 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ? 1797 ", fast-frames" : "", 1798 IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ? 1799 ", turbo" : "" 1800 ); 1801 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype); 1802 break; 1803 } 1804 1805 case IEEE80211_FC0_SUBTYPE_DEAUTH: { 1806 uint16_t reason; 1807 1808 if (vap->iv_state == IEEE80211_S_SCAN) { 1809 vap->iv_stats.is_rx_mgtdiscard++; 1810 return; 1811 } 1812 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1813 /* NB: can happen when in promiscuous mode */ 1814 vap->iv_stats.is_rx_mgtdiscard++; 1815 break; 1816 } 1817 1818 /* 1819 * deauth frame format 1820 * [2] reason 1821 */ 1822 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1823 reason = le16toh(*(uint16_t *)frm); 1824 1825 vap->iv_stats.is_rx_deauth++; 1826 vap->iv_stats.is_rx_deauth_code = reason; 1827 IEEE80211_NODE_STAT(ni, rx_deauth); 1828 1829 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1830 "recv deauthenticate (reason: %d (%s))", reason, 1831 ieee80211_reason_to_string(reason)); 1832 ieee80211_new_state(vap, IEEE80211_S_AUTH, 1833 (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); 1834 break; 1835 } 1836 1837 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 1838 uint16_t reason; 1839 1840 if (vap->iv_state != IEEE80211_S_RUN && 1841 vap->iv_state != IEEE80211_S_ASSOC && 1842 vap->iv_state != IEEE80211_S_AUTH) { 1843 vap->iv_stats.is_rx_mgtdiscard++; 1844 return; 1845 } 1846 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 1847 /* NB: can happen when in promiscuous mode */ 1848 vap->iv_stats.is_rx_mgtdiscard++; 1849 break; 1850 } 1851 1852 /* 1853 * disassoc frame format 1854 * [2] reason 1855 */ 1856 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 1857 reason = le16toh(*(uint16_t *)frm); 1858 1859 vap->iv_stats.is_rx_disassoc++; 1860 vap->iv_stats.is_rx_disassoc_code = reason; 1861 IEEE80211_NODE_STAT(ni, rx_disassoc); 1862 1863 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1864 "recv disassociate (reason: %d (%s))", reason, 1865 ieee80211_reason_to_string(reason)); 1866 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0); 1867 break; 1868 } 1869 1870 case IEEE80211_FC0_SUBTYPE_ACTION: 1871 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1872 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 1873 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1874 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1875 wh, NULL, "%s", "not for us"); 1876 vap->iv_stats.is_rx_mgtdiscard++; 1877 } else if (vap->iv_state != IEEE80211_S_RUN) { 1878 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1879 wh, NULL, "wrong state %s", 1880 ieee80211_state_name[vap->iv_state]); 1881 vap->iv_stats.is_rx_mgtdiscard++; 1882 } else { 1883 if (ieee80211_parse_action(ni, m0) == 0) 1884 (void)ic->ic_recv_action(ni, wh, frm, efrm); 1885 } 1886 break; 1887 1888 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1889 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1890 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1891 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1892 case IEEE80211_FC0_SUBTYPE_ATIM: 1893 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1894 wh, NULL, "%s", "not handled"); 1895 vap->iv_stats.is_rx_mgtdiscard++; 1896 break; 1897 1898 default: 1899 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1900 wh, "mgt", "subtype 0x%x not handled", subtype); 1901 vap->iv_stats.is_rx_badsubtype++; 1902 break; 1903 } 1904 #undef ISREASSOC 1905 } 1906 1907 static void 1908 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1909 { 1910 switch (subtype) { 1911 case IEEE80211_FC0_SUBTYPE_BAR: 1912 ieee80211_recv_bar(ni, m); 1913 break; 1914 } 1915 } 1916