Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net80211/ieee80211_hostap.c
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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 HOSTAP 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_var.h> 52 #include <net/if_media.h> 53 #include <net/if_llc.h> 54 #include <net/ethernet.h> 55 56 #include <net/bpf.h> 57 58 #include <net80211/ieee80211_var.h> 59 #include <net80211/ieee80211_hostap.h> 60 #include <net80211/ieee80211_input.h> 61 #ifdef IEEE80211_SUPPORT_SUPERG 62 #include <net80211/ieee80211_superg.h> 63 #endif 64 #include <net80211/ieee80211_wds.h> 65 66 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 67 68 static void hostap_vattach(struct ieee80211vap *); 69 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 71 const struct ieee80211_rx_stats *, 72 int rssi, int nf); 73 static void hostap_deliver_data(struct ieee80211vap *, 74 struct ieee80211_node *, struct mbuf *); 75 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf); 77 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 78 79 void 80 ieee80211_hostap_attach(struct ieee80211com *ic) 81 { 82 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 83 } 84 85 void 86 ieee80211_hostap_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 hostap_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 hostap_vattach(struct ieee80211vap *vap) 97 { 98 vap->iv_newstate = hostap_newstate; 99 vap->iv_input = hostap_input; 100 vap->iv_recv_mgmt = hostap_recv_mgmt; 101 vap->iv_recv_ctl = hostap_recv_ctl; 102 vap->iv_opdetach = hostap_vdetach; 103 vap->iv_deliver_data = hostap_deliver_data; 104 vap->iv_recv_pspoll = ieee80211_recv_pspoll; 105 } 106 107 static void 108 sta_disassoc(void *arg, struct ieee80211_node *ni) 109 { 110 struct ieee80211vap *vap = arg; 111 112 if (ni->ni_vap == vap && ni->ni_associd != 0) { 113 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 114 IEEE80211_REASON_ASSOC_LEAVE); 115 ieee80211_node_leave(ni); 116 } 117 } 118 119 static void 120 sta_csa(void *arg, struct ieee80211_node *ni) 121 { 122 struct ieee80211vap *vap = arg; 123 124 if (ni->ni_vap == vap && ni->ni_associd != 0) 125 if (ni->ni_inact > vap->iv_inact_init) { 126 ni->ni_inact = vap->iv_inact_init; 127 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 128 "%s: inact %u", __func__, ni->ni_inact); 129 } 130 } 131 132 static void 133 sta_drop(void *arg, struct ieee80211_node *ni) 134 { 135 struct ieee80211vap *vap = arg; 136 137 if (ni->ni_vap == vap && ni->ni_associd != 0) 138 ieee80211_node_leave(ni); 139 } 140 141 /* 142 * Does a channel change require associated stations to re-associate 143 * so protocol state is correct. This is used when doing CSA across 144 * bands or similar (e.g. HT -> legacy). 145 */ 146 static int 147 isbandchange(struct ieee80211com *ic) 148 { 149 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 150 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 151 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 152 } 153 154 /* 155 * IEEE80211_M_HOSTAP vap state machine handler. 156 */ 157 static int 158 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 159 { 160 struct ieee80211com *ic = vap->iv_ic; 161 enum ieee80211_state ostate; 162 163 IEEE80211_LOCK_ASSERT(ic); 164 165 ostate = vap->iv_state; 166 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 167 __func__, ieee80211_state_name[ostate], 168 ieee80211_state_name[nstate], arg); 169 vap->iv_state = nstate; /* state transition */ 170 if (ostate != IEEE80211_S_SCAN) 171 ieee80211_cancel_scan(vap); /* background scan */ 172 switch (nstate) { 173 case IEEE80211_S_INIT: 174 switch (ostate) { 175 case IEEE80211_S_SCAN: 176 ieee80211_cancel_scan(vap); 177 break; 178 case IEEE80211_S_CAC: 179 ieee80211_dfs_cac_stop(vap); 180 break; 181 case IEEE80211_S_RUN: 182 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 183 break; 184 default: 185 break; 186 } 187 if (ostate != IEEE80211_S_INIT) { 188 /* NB: optimize INIT -> INIT case */ 189 ieee80211_reset_bss(vap); 190 } 191 if (vap->iv_auth->ia_detach != NULL) 192 vap->iv_auth->ia_detach(vap); 193 break; 194 case IEEE80211_S_SCAN: 195 switch (ostate) { 196 case IEEE80211_S_CSA: 197 case IEEE80211_S_RUN: 198 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 199 /* 200 * Clear overlapping BSS state; the beacon frame 201 * will be reconstructed on transition to the RUN 202 * state and the timeout routines check if the flag 203 * is set before doing anything so this is sufficient. 204 */ 205 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 206 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 207 /* fall thru... */ 208 case IEEE80211_S_CAC: 209 /* 210 * NB: We may get here because of a manual channel 211 * change in which case we need to stop CAC 212 * XXX no need to stop if ostate RUN but it's ok 213 */ 214 ieee80211_dfs_cac_stop(vap); 215 /* fall thru... */ 216 case IEEE80211_S_INIT: 217 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 218 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 219 /* 220 * Already have a channel; bypass the 221 * scan and startup immediately. 222 * ieee80211_create_ibss will call back to 223 * move us to RUN state. 224 */ 225 ieee80211_create_ibss(vap, vap->iv_des_chan); 226 break; 227 } 228 /* 229 * Initiate a scan. We can come here as a result 230 * of an IEEE80211_IOC_SCAN_REQ too in which case 231 * the vap will be marked with IEEE80211_FEXT_SCANREQ 232 * and the scan request parameters will be present 233 * in iv_scanreq. Otherwise we do the default. 234 */ 235 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 236 ieee80211_check_scan(vap, 237 vap->iv_scanreq_flags, 238 vap->iv_scanreq_duration, 239 vap->iv_scanreq_mindwell, 240 vap->iv_scanreq_maxdwell, 241 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 242 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 243 } else 244 ieee80211_check_scan_current(vap); 245 break; 246 case IEEE80211_S_SCAN: 247 /* 248 * A state change requires a reset; scan. 249 */ 250 ieee80211_check_scan_current(vap); 251 break; 252 default: 253 break; 254 } 255 break; 256 case IEEE80211_S_CAC: 257 /* 258 * Start CAC on a DFS channel. We come here when starting 259 * a bss on a DFS channel (see ieee80211_create_ibss). 260 */ 261 ieee80211_dfs_cac_start(vap); 262 break; 263 case IEEE80211_S_RUN: 264 if (vap->iv_flags & IEEE80211_F_WPA) { 265 /* XXX validate prerequisites */ 266 } 267 switch (ostate) { 268 case IEEE80211_S_INIT: 269 /* 270 * Already have a channel; bypass the 271 * scan and startup immediately. 272 * Note that ieee80211_create_ibss will call 273 * back to do a RUN->RUN state change. 274 */ 275 ieee80211_create_ibss(vap, 276 ieee80211_ht_adjust_channel(ic, 277 ic->ic_curchan, vap->iv_flags_ht)); 278 /* NB: iv_bss is changed on return */ 279 break; 280 case IEEE80211_S_CAC: 281 /* 282 * NB: This is the normal state change when CAC 283 * expires and no radar was detected; no need to 284 * clear the CAC timer as it's already expired. 285 */ 286 /* fall thru... */ 287 case IEEE80211_S_CSA: 288 /* 289 * Shorten inactivity timer of associated stations 290 * to weed out sta's that don't follow a CSA. 291 */ 292 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 293 /* 294 * Update bss node channel to reflect where 295 * we landed after CSA. 296 */ 297 ieee80211_node_set_chan(vap->iv_bss, 298 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 299 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 300 /* XXX bypass debug msgs */ 301 break; 302 case IEEE80211_S_SCAN: 303 case IEEE80211_S_RUN: 304 #ifdef IEEE80211_DEBUG 305 if (ieee80211_msg_debug(vap)) { 306 struct ieee80211_node *ni = vap->iv_bss; 307 ieee80211_note(vap, 308 "synchronized with %s ssid ", 309 ether_sprintf(ni->ni_bssid)); 310 ieee80211_print_essid(ni->ni_essid, 311 ni->ni_esslen); 312 /* XXX MCS/HT */ 313 printf(" channel %d start %uMb\n", 314 ieee80211_chan2ieee(ic, ic->ic_curchan), 315 IEEE80211_RATE2MBS(ni->ni_txrate)); 316 } 317 #endif 318 break; 319 default: 320 break; 321 } 322 /* 323 * Start/stop the authenticator. We delay until here 324 * to allow configuration to happen out of order. 325 */ 326 if (vap->iv_auth->ia_attach != NULL) { 327 /* XXX check failure */ 328 vap->iv_auth->ia_attach(vap); 329 } else if (vap->iv_auth->ia_detach != NULL) { 330 vap->iv_auth->ia_detach(vap); 331 } 332 ieee80211_node_authorize(vap->iv_bss); 333 break; 334 case IEEE80211_S_CSA: 335 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 336 /* 337 * On a ``band change'' silently drop associated 338 * stations as they must re-associate before they 339 * can pass traffic (as otherwise protocol state 340 * such as capabilities and the negotiated rate 341 * set may/will be wrong). 342 */ 343 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 344 } 345 break; 346 default: 347 break; 348 } 349 return 0; 350 } 351 352 static void 353 hostap_deliver_data(struct ieee80211vap *vap, 354 struct ieee80211_node *ni, struct mbuf *m) 355 { 356 struct ether_header *eh = mtod(m, struct ether_header *); 357 struct ifnet *ifp = vap->iv_ifp; 358 359 /* clear driver/net80211 flags before passing up */ 360 m->m_flags &= ~(M_MCAST | M_BCAST); 361 m_clrprotoflags(m); 362 363 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 364 ("gack, opmode %d", vap->iv_opmode)); 365 /* 366 * Do accounting. 367 */ 368 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 369 IEEE80211_NODE_STAT(ni, rx_data); 370 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 371 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 372 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 373 IEEE80211_NODE_STAT(ni, rx_mcast); 374 } else 375 IEEE80211_NODE_STAT(ni, rx_ucast); 376 377 /* perform as a bridge within the AP */ 378 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 379 struct mbuf *mcopy = NULL; 380 381 if (m->m_flags & M_MCAST) { 382 mcopy = m_dup(m, M_NOWAIT); 383 if (mcopy == NULL) 384 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 385 else 386 mcopy->m_flags |= M_MCAST; 387 } else { 388 /* 389 * Check if the destination is associated with the 390 * same vap and authorized to receive traffic. 391 * Beware of traffic destined for the vap itself; 392 * sending it will not work; just let it be delivered 393 * normally. 394 */ 395 struct ieee80211_node *sta = ieee80211_find_vap_node( 396 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 397 if (sta != NULL) { 398 if (ieee80211_node_is_authorized(sta)) { 399 /* 400 * Beware of sending to ourself; this 401 * needs to happen via the normal 402 * input path. 403 */ 404 if (sta != vap->iv_bss) { 405 mcopy = m; 406 m = NULL; 407 } 408 } else { 409 vap->iv_stats.is_rx_unauth++; 410 IEEE80211_NODE_STAT(sta, rx_unauth); 411 } 412 ieee80211_free_node(sta); 413 } 414 } 415 if (mcopy != NULL) 416 (void) ieee80211_vap_xmitpkt(vap, mcopy); 417 } 418 if (m != NULL) { 419 /* 420 * Mark frame as coming from vap's interface. 421 */ 422 m->m_pkthdr.rcvif = ifp; 423 if (m->m_flags & M_MCAST) { 424 /* 425 * Spam DWDS vap's w/ multicast traffic. 426 */ 427 /* XXX only if dwds in use? */ 428 ieee80211_dwds_mcast(vap, m); 429 } 430 if (ni->ni_vlan != 0) { 431 /* attach vlan tag */ 432 m->m_pkthdr.ether_vtag = ni->ni_vlan; 433 m->m_flags |= M_VLANTAG; 434 } 435 ifp->if_input(ifp, m); 436 } 437 } 438 439 /* 440 * Decide if a received management frame should be 441 * printed when debugging is enabled. This filters some 442 * of the less interesting frames that come frequently 443 * (e.g. beacons). 444 */ 445 static __inline int 446 doprint(struct ieee80211vap *vap, int subtype) 447 { 448 switch (subtype) { 449 case IEEE80211_FC0_SUBTYPE_BEACON: 450 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 451 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 452 return 0; 453 } 454 return 1; 455 } 456 457 /* 458 * Process a received frame. The node associated with the sender 459 * should be supplied. If nothing was found in the node table then 460 * the caller is assumed to supply a reference to iv_bss instead. 461 * The RSSI and a timestamp are also supplied. The RSSI data is used 462 * during AP scanning to select a AP to associate with; it can have 463 * any units so long as values have consistent units and higher values 464 * mean ``better signal''. The receive timestamp is currently not used 465 * by the 802.11 layer. 466 */ 467 static int 468 hostap_input(struct ieee80211_node *ni, struct mbuf *m, 469 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 470 { 471 struct ieee80211vap *vap = ni->ni_vap; 472 struct ieee80211com *ic = ni->ni_ic; 473 struct ifnet *ifp = vap->iv_ifp; 474 struct ieee80211_frame *wh; 475 struct ieee80211_key *key; 476 struct ether_header *eh; 477 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 478 uint8_t dir, type, subtype, qos; 479 uint8_t *bssid; 480 481 if (m->m_flags & M_AMPDU_MPDU) { 482 /* 483 * Fastpath for A-MPDU reorder q resubmission. Frames 484 * w/ M_AMPDU_MPDU marked have already passed through 485 * here but were received out of order and been held on 486 * the reorder queue. When resubmitted they are marked 487 * with the M_AMPDU_MPDU flag and we can bypass most of 488 * the normal processing. 489 */ 490 wh = mtod(m, struct ieee80211_frame *); 491 type = IEEE80211_FC0_TYPE_DATA; 492 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 493 subtype = IEEE80211_FC0_SUBTYPE_QOS; 494 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 495 goto resubmit_ampdu; 496 } 497 498 KASSERT(ni != NULL, ("null node")); 499 ni->ni_inact = ni->ni_inact_reload; 500 501 type = -1; /* undefined */ 502 503 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 504 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 505 ni->ni_macaddr, NULL, 506 "too short (1): len %u", m->m_pkthdr.len); 507 vap->iv_stats.is_rx_tooshort++; 508 goto out; 509 } 510 /* 511 * Bit of a cheat here, we use a pointer for a 3-address 512 * frame format but don't reference fields past outside 513 * ieee80211_frame_min w/o first validating the data is 514 * present. 515 */ 516 wh = mtod(m, struct ieee80211_frame *); 517 518 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 519 IEEE80211_FC0_VERSION_0) { 520 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 521 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 522 wh->i_fc[0], wh->i_fc[1]); 523 vap->iv_stats.is_rx_badversion++; 524 goto err; 525 } 526 527 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 528 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 529 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 530 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 531 if (dir != IEEE80211_FC1_DIR_NODS) 532 bssid = wh->i_addr1; 533 else if (type == IEEE80211_FC0_TYPE_CTL) 534 bssid = wh->i_addr1; 535 else { 536 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 537 IEEE80211_DISCARD_MAC(vap, 538 IEEE80211_MSG_ANY, ni->ni_macaddr, 539 NULL, "too short (2): len %u", 540 m->m_pkthdr.len); 541 vap->iv_stats.is_rx_tooshort++; 542 goto out; 543 } 544 bssid = wh->i_addr3; 545 } 546 /* 547 * Validate the bssid. 548 */ 549 if (!(type == IEEE80211_FC0_TYPE_MGT && 550 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 551 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 552 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 553 /* not interested in */ 554 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 555 bssid, NULL, "%s", "not to bss"); 556 vap->iv_stats.is_rx_wrongbss++; 557 goto out; 558 } 559 560 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 561 ni->ni_noise = nf; 562 if (IEEE80211_HAS_SEQ(type, subtype)) { 563 uint8_t tid = ieee80211_gettid(wh); 564 if (IEEE80211_QOS_HAS_SEQ(wh) && 565 TID_TO_WME_AC(tid) >= WME_AC_VI) 566 ic->ic_wme.wme_hipri_traffic++; 567 if (! ieee80211_check_rxseq(ni, wh, bssid)) 568 goto out; 569 } 570 } 571 572 switch (type) { 573 case IEEE80211_FC0_TYPE_DATA: 574 hdrspace = ieee80211_hdrspace(ic, wh); 575 if (m->m_len < hdrspace && 576 (m = m_pullup(m, hdrspace)) == NULL) { 577 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 578 ni->ni_macaddr, NULL, 579 "data too short: expecting %u", hdrspace); 580 vap->iv_stats.is_rx_tooshort++; 581 goto out; /* XXX */ 582 } 583 if (!(dir == IEEE80211_FC1_DIR_TODS || 584 (dir == IEEE80211_FC1_DIR_DSTODS && 585 (vap->iv_flags & IEEE80211_F_DWDS)))) { 586 if (dir != IEEE80211_FC1_DIR_DSTODS) { 587 IEEE80211_DISCARD(vap, 588 IEEE80211_MSG_INPUT, wh, "data", 589 "incorrect dir 0x%x", dir); 590 } else { 591 IEEE80211_DISCARD(vap, 592 IEEE80211_MSG_INPUT | 593 IEEE80211_MSG_WDS, wh, 594 "4-address data", 595 "%s", "DWDS not enabled"); 596 } 597 vap->iv_stats.is_rx_wrongdir++; 598 goto out; 599 } 600 /* check if source STA is associated */ 601 if (ni == vap->iv_bss) { 602 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 603 wh, "data", "%s", "unknown src"); 604 ieee80211_send_error(ni, wh->i_addr2, 605 IEEE80211_FC0_SUBTYPE_DEAUTH, 606 IEEE80211_REASON_NOT_AUTHED); 607 vap->iv_stats.is_rx_notassoc++; 608 goto err; 609 } 610 if (ni->ni_associd == 0) { 611 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 612 wh, "data", "%s", "unassoc src"); 613 IEEE80211_SEND_MGMT(ni, 614 IEEE80211_FC0_SUBTYPE_DISASSOC, 615 IEEE80211_REASON_NOT_ASSOCED); 616 vap->iv_stats.is_rx_notassoc++; 617 goto err; 618 } 619 620 /* 621 * Check for power save state change. 622 * XXX out-of-order A-MPDU frames? 623 */ 624 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 625 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 626 vap->iv_node_ps(ni, 627 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 628 /* 629 * For 4-address packets handle WDS discovery 630 * notifications. Once a WDS link is setup frames 631 * are just delivered to the WDS vap (see below). 632 */ 633 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 634 if (!ieee80211_node_is_authorized(ni)) { 635 IEEE80211_DISCARD(vap, 636 IEEE80211_MSG_INPUT | 637 IEEE80211_MSG_WDS, wh, 638 "4-address data", 639 "%s", "unauthorized port"); 640 vap->iv_stats.is_rx_unauth++; 641 IEEE80211_NODE_STAT(ni, rx_unauth); 642 goto err; 643 } 644 ieee80211_dwds_discover(ni, m); 645 return type; 646 } 647 648 /* 649 * Handle A-MPDU re-ordering. If the frame is to be 650 * processed directly then ieee80211_ampdu_reorder 651 * will return 0; otherwise it has consumed the mbuf 652 * and we should do nothing more with it. 653 */ 654 if ((m->m_flags & M_AMPDU) && 655 ieee80211_ampdu_reorder(ni, m) != 0) { 656 m = NULL; 657 goto out; 658 } 659 resubmit_ampdu: 660 661 /* 662 * Handle privacy requirements. Note that we 663 * must not be preempted from here until after 664 * we (potentially) call ieee80211_crypto_demic; 665 * otherwise we may violate assumptions in the 666 * crypto cipher modules used to do delayed update 667 * of replay sequence numbers. 668 */ 669 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 670 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 671 /* 672 * Discard encrypted frames when privacy is off. 673 */ 674 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 675 wh, "WEP", "%s", "PRIVACY off"); 676 vap->iv_stats.is_rx_noprivacy++; 677 IEEE80211_NODE_STAT(ni, rx_noprivacy); 678 goto out; 679 } 680 key = ieee80211_crypto_decap(ni, m, hdrspace); 681 if (key == NULL) { 682 /* NB: stats+msgs handled in crypto_decap */ 683 IEEE80211_NODE_STAT(ni, rx_wepfail); 684 goto out; 685 } 686 wh = mtod(m, struct ieee80211_frame *); 687 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 688 } else { 689 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 690 key = NULL; 691 } 692 693 /* 694 * Save QoS bits for use below--before we strip the header. 695 */ 696 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) 697 qos = ieee80211_getqos(wh)[0]; 698 else 699 qos = 0; 700 701 /* 702 * Next up, any fragmentation. 703 */ 704 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 705 m = ieee80211_defrag(ni, m, hdrspace); 706 if (m == NULL) { 707 /* Fragment dropped or frame not complete yet */ 708 goto out; 709 } 710 } 711 wh = NULL; /* no longer valid, catch any uses */ 712 713 /* 714 * Next strip any MSDU crypto bits. 715 */ 716 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 717 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 718 ni->ni_macaddr, "data", "%s", "demic error"); 719 vap->iv_stats.is_rx_demicfail++; 720 IEEE80211_NODE_STAT(ni, rx_demicfail); 721 goto out; 722 } 723 /* copy to listener after decrypt */ 724 if (ieee80211_radiotap_active_vap(vap)) 725 ieee80211_radiotap_rx(vap, m); 726 need_tap = 0; 727 /* 728 * Finally, strip the 802.11 header. 729 */ 730 m = ieee80211_decap(vap, m, hdrspace); 731 if (m == NULL) { 732 /* XXX mask bit to check for both */ 733 /* don't count Null data frames as errors */ 734 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 735 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 736 goto out; 737 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 738 ni->ni_macaddr, "data", "%s", "decap error"); 739 vap->iv_stats.is_rx_decap++; 740 IEEE80211_NODE_STAT(ni, rx_decap); 741 goto err; 742 } 743 eh = mtod(m, struct ether_header *); 744 if (!ieee80211_node_is_authorized(ni)) { 745 /* 746 * Deny any non-PAE frames received prior to 747 * authorization. For open/shared-key 748 * authentication the port is mark authorized 749 * after authentication completes. For 802.1x 750 * the port is not marked authorized by the 751 * authenticator until the handshake has completed. 752 */ 753 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 754 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 755 eh->ether_shost, "data", 756 "unauthorized port: ether type 0x%x len %u", 757 eh->ether_type, m->m_pkthdr.len); 758 vap->iv_stats.is_rx_unauth++; 759 IEEE80211_NODE_STAT(ni, rx_unauth); 760 goto err; 761 } 762 } else { 763 /* 764 * When denying unencrypted frames, discard 765 * any non-PAE frames received without encryption. 766 */ 767 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 768 (key == NULL && (m->m_flags & M_WEP) == 0) && 769 eh->ether_type != htons(ETHERTYPE_PAE)) { 770 /* 771 * Drop unencrypted frames. 772 */ 773 vap->iv_stats.is_rx_unencrypted++; 774 IEEE80211_NODE_STAT(ni, rx_unencrypted); 775 goto out; 776 } 777 } 778 /* XXX require HT? */ 779 if (qos & IEEE80211_QOS_AMSDU) { 780 m = ieee80211_decap_amsdu(ni, m); 781 if (m == NULL) 782 return IEEE80211_FC0_TYPE_DATA; 783 } else { 784 #ifdef IEEE80211_SUPPORT_SUPERG 785 m = ieee80211_decap_fastframe(vap, ni, m); 786 if (m == NULL) 787 return IEEE80211_FC0_TYPE_DATA; 788 #endif 789 } 790 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 791 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 792 else 793 hostap_deliver_data(vap, ni, m); 794 return IEEE80211_FC0_TYPE_DATA; 795 796 case IEEE80211_FC0_TYPE_MGT: 797 vap->iv_stats.is_rx_mgmt++; 798 IEEE80211_NODE_STAT(ni, rx_mgmt); 799 if (dir != IEEE80211_FC1_DIR_NODS) { 800 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 801 wh, "mgt", "incorrect dir 0x%x", dir); 802 vap->iv_stats.is_rx_wrongdir++; 803 goto err; 804 } 805 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 806 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 807 ni->ni_macaddr, "mgt", "too short: len %u", 808 m->m_pkthdr.len); 809 vap->iv_stats.is_rx_tooshort++; 810 goto out; 811 } 812 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 813 /* ensure return frames are unicast */ 814 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 815 wh, NULL, "source is multicast: %s", 816 ether_sprintf(wh->i_addr2)); 817 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 818 goto out; 819 } 820 #ifdef IEEE80211_DEBUG 821 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 822 ieee80211_msg_dumppkts(vap)) { 823 if_printf(ifp, "received %s from %s rssi %d\n", 824 ieee80211_mgt_subtype_name(subtype), 825 ether_sprintf(wh->i_addr2), rssi); 826 } 827 #endif 828 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 829 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 830 /* 831 * Only shared key auth frames with a challenge 832 * should be encrypted, discard all others. 833 */ 834 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 835 wh, NULL, 836 "%s", "WEP set but not permitted"); 837 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 838 goto out; 839 } 840 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 841 /* 842 * Discard encrypted frames when privacy is off. 843 */ 844 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 845 wh, NULL, "%s", "WEP set but PRIVACY off"); 846 vap->iv_stats.is_rx_noprivacy++; 847 goto out; 848 } 849 hdrspace = ieee80211_hdrspace(ic, wh); 850 key = ieee80211_crypto_decap(ni, m, hdrspace); 851 if (key == NULL) { 852 /* NB: stats+msgs handled in crypto_decap */ 853 goto out; 854 } 855 wh = mtod(m, struct ieee80211_frame *); 856 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 857 } 858 /* 859 * Pass the packet to radiotap before calling iv_recv_mgmt(). 860 * Otherwise iv_recv_mgmt() might pass another packet to 861 * radiotap, resulting in out of order packet captures. 862 */ 863 if (ieee80211_radiotap_active_vap(vap)) 864 ieee80211_radiotap_rx(vap, m); 865 need_tap = 0; 866 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 867 goto out; 868 869 case IEEE80211_FC0_TYPE_CTL: 870 vap->iv_stats.is_rx_ctl++; 871 IEEE80211_NODE_STAT(ni, rx_ctrl); 872 vap->iv_recv_ctl(ni, m, subtype); 873 goto out; 874 default: 875 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 876 wh, "bad", "frame type 0x%x", type); 877 /* should not come here */ 878 break; 879 } 880 err: 881 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 882 out: 883 if (m != NULL) { 884 if (need_tap && ieee80211_radiotap_active_vap(vap)) 885 ieee80211_radiotap_rx(vap, m); 886 m_freem(m); 887 } 888 return type; 889 } 890 891 static void 892 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 893 int rssi, int nf, uint16_t seq, uint16_t status) 894 { 895 struct ieee80211vap *vap = ni->ni_vap; 896 897 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 898 899 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 900 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 901 ni->ni_macaddr, "open auth", 902 "bad sta auth mode %u", ni->ni_authmode); 903 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 904 /* 905 * Clear any challenge text that may be there if 906 * a previous shared key auth failed and then an 907 * open auth is attempted. 908 */ 909 if (ni->ni_challenge != NULL) { 910 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 911 ni->ni_challenge = NULL; 912 } 913 /* XXX hack to workaround calling convention */ 914 ieee80211_send_error(ni, wh->i_addr2, 915 IEEE80211_FC0_SUBTYPE_AUTH, 916 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 917 return; 918 } 919 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 920 vap->iv_stats.is_rx_bad_auth++; 921 return; 922 } 923 /* always accept open authentication requests */ 924 if (ni == vap->iv_bss) { 925 ni = ieee80211_dup_bss(vap, wh->i_addr2); 926 if (ni == NULL) 927 return; 928 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 929 (void) ieee80211_ref_node(ni); 930 /* 931 * Mark the node as referenced to reflect that it's 932 * reference count has been bumped to insure it remains 933 * after the transaction completes. 934 */ 935 ni->ni_flags |= IEEE80211_NODE_AREF; 936 /* 937 * Mark the node as requiring a valid association id 938 * before outbound traffic is permitted. 939 */ 940 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 941 942 if (vap->iv_acl != NULL && 943 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 944 /* 945 * When the ACL policy is set to RADIUS we defer the 946 * authorization to a user agent. Dispatch an event, 947 * a subsequent MLME call will decide the fate of the 948 * station. If the user agent is not present then the 949 * node will be reclaimed due to inactivity. 950 */ 951 IEEE80211_NOTE_MAC(vap, 952 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 953 "%s", "station authentication defered (radius acl)"); 954 ieee80211_notify_node_auth(ni); 955 } else { 956 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 957 IEEE80211_NOTE_MAC(vap, 958 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 959 "%s", "station authenticated (open)"); 960 /* 961 * When 802.1x is not in use mark the port 962 * authorized at this point so traffic can flow. 963 */ 964 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 965 ieee80211_node_authorize(ni); 966 } 967 } 968 969 static void 970 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 971 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 972 uint16_t seq, uint16_t status) 973 { 974 struct ieee80211vap *vap = ni->ni_vap; 975 uint8_t *challenge; 976 int allocbs, estatus; 977 978 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 979 980 /* 981 * NB: this can happen as we allow pre-shared key 982 * authentication to be enabled w/o wep being turned 983 * on so that configuration of these can be done 984 * in any order. It may be better to enforce the 985 * ordering in which case this check would just be 986 * for sanity/consistency. 987 */ 988 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 989 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 990 ni->ni_macaddr, "shared key auth", 991 "%s", " PRIVACY is disabled"); 992 estatus = IEEE80211_STATUS_ALG; 993 goto bad; 994 } 995 /* 996 * Pre-shared key authentication is evil; accept 997 * it only if explicitly configured (it is supported 998 * mainly for compatibility with clients like Mac OS X). 999 */ 1000 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1001 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1002 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1003 ni->ni_macaddr, "shared key auth", 1004 "bad sta auth mode %u", ni->ni_authmode); 1005 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1006 estatus = IEEE80211_STATUS_ALG; 1007 goto bad; 1008 } 1009 1010 challenge = NULL; 1011 if (frm + 1 < efrm) { 1012 if ((frm[1] + 2) > (efrm - frm)) { 1013 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1014 ni->ni_macaddr, "shared key auth", 1015 "ie %d/%d too long", 1016 frm[0], (frm[1] + 2) - (efrm - frm)); 1017 vap->iv_stats.is_rx_bad_auth++; 1018 estatus = IEEE80211_STATUS_CHALLENGE; 1019 goto bad; 1020 } 1021 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1022 challenge = frm; 1023 frm += frm[1] + 2; 1024 } 1025 switch (seq) { 1026 case IEEE80211_AUTH_SHARED_CHALLENGE: 1027 case IEEE80211_AUTH_SHARED_RESPONSE: 1028 if (challenge == NULL) { 1029 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1030 ni->ni_macaddr, "shared key auth", 1031 "%s", "no challenge"); 1032 vap->iv_stats.is_rx_bad_auth++; 1033 estatus = IEEE80211_STATUS_CHALLENGE; 1034 goto bad; 1035 } 1036 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1037 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1038 ni->ni_macaddr, "shared key auth", 1039 "bad challenge len %d", challenge[1]); 1040 vap->iv_stats.is_rx_bad_auth++; 1041 estatus = IEEE80211_STATUS_CHALLENGE; 1042 goto bad; 1043 } 1044 default: 1045 break; 1046 } 1047 switch (seq) { 1048 case IEEE80211_AUTH_SHARED_REQUEST: 1049 if (ni == vap->iv_bss) { 1050 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1051 if (ni == NULL) { 1052 /* NB: no way to return an error */ 1053 return; 1054 } 1055 allocbs = 1; 1056 } else { 1057 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1058 (void) ieee80211_ref_node(ni); 1059 allocbs = 0; 1060 } 1061 /* 1062 * Mark the node as referenced to reflect that it's 1063 * reference count has been bumped to insure it remains 1064 * after the transaction completes. 1065 */ 1066 ni->ni_flags |= IEEE80211_NODE_AREF; 1067 /* 1068 * Mark the node as requiring a valid association id 1069 * before outbound traffic is permitted. 1070 */ 1071 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1072 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1073 ni->ni_noise = nf; 1074 if (!ieee80211_alloc_challenge(ni)) { 1075 /* NB: don't return error so they rexmit */ 1076 return; 1077 } 1078 get_random_bytes(ni->ni_challenge, 1079 IEEE80211_CHALLENGE_LEN); 1080 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1081 ni, "shared key %sauth request", allocbs ? "" : "re"); 1082 /* 1083 * When the ACL policy is set to RADIUS we defer the 1084 * authorization to a user agent. Dispatch an event, 1085 * a subsequent MLME call will decide the fate of the 1086 * station. If the user agent is not present then the 1087 * node will be reclaimed due to inactivity. 1088 */ 1089 if (vap->iv_acl != NULL && 1090 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1091 IEEE80211_NOTE_MAC(vap, 1092 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1093 ni->ni_macaddr, 1094 "%s", "station authentication defered (radius acl)"); 1095 ieee80211_notify_node_auth(ni); 1096 return; 1097 } 1098 break; 1099 case IEEE80211_AUTH_SHARED_RESPONSE: 1100 if (ni == vap->iv_bss) { 1101 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1102 ni->ni_macaddr, "shared key response", 1103 "%s", "unknown station"); 1104 /* NB: don't send a response */ 1105 return; 1106 } 1107 if (ni->ni_challenge == NULL) { 1108 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1109 ni->ni_macaddr, "shared key response", 1110 "%s", "no challenge recorded"); 1111 vap->iv_stats.is_rx_bad_auth++; 1112 estatus = IEEE80211_STATUS_CHALLENGE; 1113 goto bad; 1114 } 1115 if (memcmp(ni->ni_challenge, &challenge[2], 1116 challenge[1]) != 0) { 1117 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1118 ni->ni_macaddr, "shared key response", 1119 "%s", "challenge mismatch"); 1120 vap->iv_stats.is_rx_auth_fail++; 1121 estatus = IEEE80211_STATUS_CHALLENGE; 1122 goto bad; 1123 } 1124 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1125 ni, "%s", "station authenticated (shared key)"); 1126 ieee80211_node_authorize(ni); 1127 break; 1128 default: 1129 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1130 ni->ni_macaddr, "shared key auth", 1131 "bad seq %d", seq); 1132 vap->iv_stats.is_rx_bad_auth++; 1133 estatus = IEEE80211_STATUS_SEQUENCE; 1134 goto bad; 1135 } 1136 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1137 return; 1138 bad: 1139 /* 1140 * Send an error response; but only when operating as an AP. 1141 */ 1142 /* XXX hack to workaround calling convention */ 1143 ieee80211_send_error(ni, wh->i_addr2, 1144 IEEE80211_FC0_SUBTYPE_AUTH, 1145 (seq + 1) | (estatus<<16)); 1146 } 1147 1148 /* 1149 * Convert a WPA cipher selector OUI to an internal 1150 * cipher algorithm. Where appropriate we also 1151 * record any key length. 1152 */ 1153 static int 1154 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1155 { 1156 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1157 uint32_t w = le32dec(sel); 1158 1159 switch (w) { 1160 case WPA_SEL(WPA_CSE_NULL): 1161 return IEEE80211_CIPHER_NONE; 1162 case WPA_SEL(WPA_CSE_WEP40): 1163 if (keylen) 1164 *keylen = 40 / NBBY; 1165 return IEEE80211_CIPHER_WEP; 1166 case WPA_SEL(WPA_CSE_WEP104): 1167 if (keylen) 1168 *keylen = 104 / NBBY; 1169 return IEEE80211_CIPHER_WEP; 1170 case WPA_SEL(WPA_CSE_TKIP): 1171 return IEEE80211_CIPHER_TKIP; 1172 case WPA_SEL(WPA_CSE_CCMP): 1173 return IEEE80211_CIPHER_AES_CCM; 1174 } 1175 return 32; /* NB: so 1<< is discarded */ 1176 #undef WPA_SEL 1177 } 1178 1179 /* 1180 * Convert a WPA key management/authentication algorithm 1181 * to an internal code. 1182 */ 1183 static int 1184 wpa_keymgmt(const uint8_t *sel) 1185 { 1186 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1187 uint32_t w = le32dec(sel); 1188 1189 switch (w) { 1190 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1191 return WPA_ASE_8021X_UNSPEC; 1192 case WPA_SEL(WPA_ASE_8021X_PSK): 1193 return WPA_ASE_8021X_PSK; 1194 case WPA_SEL(WPA_ASE_NONE): 1195 return WPA_ASE_NONE; 1196 } 1197 return 0; /* NB: so is discarded */ 1198 #undef WPA_SEL 1199 } 1200 1201 /* 1202 * Parse a WPA information element to collect parameters. 1203 * Note that we do not validate security parameters; that 1204 * is handled by the authenticator; the parsing done here 1205 * is just for internal use in making operational decisions. 1206 */ 1207 static int 1208 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1209 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1210 { 1211 uint8_t len = frm[1]; 1212 uint32_t w; 1213 int n; 1214 1215 /* 1216 * Check the length once for fixed parts: OUI, type, 1217 * version, mcast cipher, and 2 selector counts. 1218 * Other, variable-length data, must be checked separately. 1219 */ 1220 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1221 IEEE80211_DISCARD_IE(vap, 1222 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1223 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1224 return IEEE80211_REASON_IE_INVALID; 1225 } 1226 if (len < 14) { 1227 IEEE80211_DISCARD_IE(vap, 1228 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1229 wh, "WPA", "too short, len %u", len); 1230 return IEEE80211_REASON_IE_INVALID; 1231 } 1232 frm += 6, len -= 4; /* NB: len is payload only */ 1233 /* NB: iswpaoui already validated the OUI and type */ 1234 w = le16dec(frm); 1235 if (w != WPA_VERSION) { 1236 IEEE80211_DISCARD_IE(vap, 1237 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1238 wh, "WPA", "bad version %u", w); 1239 return IEEE80211_REASON_IE_INVALID; 1240 } 1241 frm += 2, len -= 2; 1242 1243 memset(rsn, 0, sizeof(*rsn)); 1244 1245 /* multicast/group cipher */ 1246 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1247 frm += 4, len -= 4; 1248 1249 /* unicast ciphers */ 1250 n = le16dec(frm); 1251 frm += 2, len -= 2; 1252 if (len < n*4+2) { 1253 IEEE80211_DISCARD_IE(vap, 1254 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1255 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1256 len, n); 1257 return IEEE80211_REASON_IE_INVALID; 1258 } 1259 w = 0; 1260 for (; n > 0; n--) { 1261 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1262 frm += 4, len -= 4; 1263 } 1264 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1265 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1266 else 1267 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1268 1269 /* key management algorithms */ 1270 n = le16dec(frm); 1271 frm += 2, len -= 2; 1272 if (len < n*4) { 1273 IEEE80211_DISCARD_IE(vap, 1274 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1275 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1276 len, n); 1277 return IEEE80211_REASON_IE_INVALID; 1278 } 1279 w = 0; 1280 for (; n > 0; n--) { 1281 w |= wpa_keymgmt(frm); 1282 frm += 4, len -= 4; 1283 } 1284 if (w & WPA_ASE_8021X_UNSPEC) 1285 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1286 else 1287 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1288 1289 if (len > 2) /* optional capabilities */ 1290 rsn->rsn_caps = le16dec(frm); 1291 1292 return 0; 1293 } 1294 1295 /* 1296 * Convert an RSN cipher selector OUI to an internal 1297 * cipher algorithm. Where appropriate we also 1298 * record any key length. 1299 */ 1300 static int 1301 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1302 { 1303 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1304 uint32_t w = le32dec(sel); 1305 1306 switch (w) { 1307 case RSN_SEL(RSN_CSE_NULL): 1308 return IEEE80211_CIPHER_NONE; 1309 case RSN_SEL(RSN_CSE_WEP40): 1310 if (keylen) 1311 *keylen = 40 / NBBY; 1312 return IEEE80211_CIPHER_WEP; 1313 case RSN_SEL(RSN_CSE_WEP104): 1314 if (keylen) 1315 *keylen = 104 / NBBY; 1316 return IEEE80211_CIPHER_WEP; 1317 case RSN_SEL(RSN_CSE_TKIP): 1318 return IEEE80211_CIPHER_TKIP; 1319 case RSN_SEL(RSN_CSE_CCMP): 1320 return IEEE80211_CIPHER_AES_CCM; 1321 case RSN_SEL(RSN_CSE_WRAP): 1322 return IEEE80211_CIPHER_AES_OCB; 1323 } 1324 return 32; /* NB: so 1<< is discarded */ 1325 #undef WPA_SEL 1326 } 1327 1328 /* 1329 * Convert an RSN key management/authentication algorithm 1330 * to an internal code. 1331 */ 1332 static int 1333 rsn_keymgmt(const uint8_t *sel) 1334 { 1335 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1336 uint32_t w = le32dec(sel); 1337 1338 switch (w) { 1339 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1340 return RSN_ASE_8021X_UNSPEC; 1341 case RSN_SEL(RSN_ASE_8021X_PSK): 1342 return RSN_ASE_8021X_PSK; 1343 case RSN_SEL(RSN_ASE_NONE): 1344 return RSN_ASE_NONE; 1345 } 1346 return 0; /* NB: so is discarded */ 1347 #undef RSN_SEL 1348 } 1349 1350 /* 1351 * Parse a WPA/RSN information element to collect parameters 1352 * and validate the parameters against what has been 1353 * configured for the system. 1354 */ 1355 static int 1356 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1357 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1358 { 1359 uint8_t len = frm[1]; 1360 uint32_t w; 1361 int n; 1362 1363 /* 1364 * Check the length once for fixed parts: 1365 * version, mcast cipher, and 2 selector counts. 1366 * Other, variable-length data, must be checked separately. 1367 */ 1368 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1369 IEEE80211_DISCARD_IE(vap, 1370 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1371 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1372 return IEEE80211_REASON_IE_INVALID; 1373 } 1374 if (len < 10) { 1375 IEEE80211_DISCARD_IE(vap, 1376 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1377 wh, "RSN", "too short, len %u", len); 1378 return IEEE80211_REASON_IE_INVALID; 1379 } 1380 frm += 2; 1381 w = le16dec(frm); 1382 if (w != RSN_VERSION) { 1383 IEEE80211_DISCARD_IE(vap, 1384 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1385 wh, "RSN", "bad version %u", w); 1386 return IEEE80211_REASON_IE_INVALID; 1387 } 1388 frm += 2, len -= 2; 1389 1390 memset(rsn, 0, sizeof(*rsn)); 1391 1392 /* multicast/group cipher */ 1393 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1394 frm += 4, len -= 4; 1395 1396 /* unicast ciphers */ 1397 n = le16dec(frm); 1398 frm += 2, len -= 2; 1399 if (len < n*4+2) { 1400 IEEE80211_DISCARD_IE(vap, 1401 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1402 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1403 len, n); 1404 return IEEE80211_REASON_IE_INVALID; 1405 } 1406 w = 0; 1407 for (; n > 0; n--) { 1408 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1409 frm += 4, len -= 4; 1410 } 1411 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1412 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1413 else 1414 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1415 1416 /* key management algorithms */ 1417 n = le16dec(frm); 1418 frm += 2, len -= 2; 1419 if (len < n*4) { 1420 IEEE80211_DISCARD_IE(vap, 1421 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1422 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1423 len, n); 1424 return IEEE80211_REASON_IE_INVALID; 1425 } 1426 w = 0; 1427 for (; n > 0; n--) { 1428 w |= rsn_keymgmt(frm); 1429 frm += 4, len -= 4; 1430 } 1431 if (w & RSN_ASE_8021X_UNSPEC) 1432 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1433 else 1434 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1435 1436 /* optional RSN capabilities */ 1437 if (len > 2) 1438 rsn->rsn_caps = le16dec(frm); 1439 /* XXXPMKID */ 1440 1441 return 0; 1442 } 1443 1444 /* 1445 * WPA/802.11i association request processing. 1446 */ 1447 static int 1448 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1449 const struct ieee80211_frame *wh, const uint8_t *wpa, 1450 const uint8_t *rsn, uint16_t capinfo) 1451 { 1452 struct ieee80211vap *vap = ni->ni_vap; 1453 uint8_t reason; 1454 int badwparsn; 1455 1456 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1457 if (wpa == NULL && rsn == NULL) { 1458 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1459 /* 1460 * W-Fi Protected Setup (WPS) permits 1461 * clients to associate and pass EAPOL frames 1462 * to establish initial credentials. 1463 */ 1464 ni->ni_flags |= IEEE80211_NODE_WPS; 1465 return 1; 1466 } 1467 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1468 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1469 /* 1470 * Transitional Security Network. Permits clients 1471 * to associate and use WEP while WPA is configured. 1472 */ 1473 ni->ni_flags |= IEEE80211_NODE_TSN; 1474 return 1; 1475 } 1476 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1477 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1478 vap->iv_stats.is_rx_assoc_badwpaie++; 1479 reason = IEEE80211_REASON_IE_INVALID; 1480 goto bad; 1481 } 1482 /* assert right association security credentials */ 1483 badwparsn = 0; /* NB: to silence compiler */ 1484 switch (vap->iv_flags & IEEE80211_F_WPA) { 1485 case IEEE80211_F_WPA1: 1486 badwparsn = (wpa == NULL); 1487 break; 1488 case IEEE80211_F_WPA2: 1489 badwparsn = (rsn == NULL); 1490 break; 1491 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1492 badwparsn = (wpa == NULL && rsn == NULL); 1493 break; 1494 } 1495 if (badwparsn) { 1496 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1497 wh, NULL, 1498 "%s", "missing WPA/RSN IE in association request"); 1499 vap->iv_stats.is_rx_assoc_badwpaie++; 1500 reason = IEEE80211_REASON_IE_INVALID; 1501 goto bad; 1502 } 1503 /* 1504 * Parse WPA/RSN information element. 1505 */ 1506 if (wpa != NULL) 1507 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1508 else 1509 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1510 if (reason != 0) { 1511 /* XXX distinguish WPA/RSN? */ 1512 vap->iv_stats.is_rx_assoc_badwpaie++; 1513 goto bad; 1514 } 1515 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1516 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1517 wpa != NULL ? "WPA" : "RSN", 1518 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1519 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1520 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1521 1522 return 1; 1523 bad: 1524 ieee80211_node_deauth(ni, reason); 1525 return 0; 1526 } 1527 1528 /* XXX find a better place for definition */ 1529 struct l2_update_frame { 1530 struct ether_header eh; 1531 uint8_t dsap; 1532 uint8_t ssap; 1533 uint8_t control; 1534 uint8_t xid[3]; 1535 } __packed; 1536 1537 /* 1538 * Deliver a TGf L2UF frame on behalf of a station. 1539 * This primes any bridge when the station is roaming 1540 * between ap's on the same wired network. 1541 */ 1542 static void 1543 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1544 { 1545 struct ieee80211vap *vap = ni->ni_vap; 1546 struct ifnet *ifp = vap->iv_ifp; 1547 struct mbuf *m; 1548 struct l2_update_frame *l2uf; 1549 struct ether_header *eh; 1550 1551 m = m_gethdr(M_NOWAIT, MT_DATA); 1552 if (m == NULL) { 1553 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1554 "%s", "no mbuf for l2uf frame"); 1555 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1556 return; 1557 } 1558 l2uf = mtod(m, struct l2_update_frame *); 1559 eh = &l2uf->eh; 1560 /* dst: Broadcast address */ 1561 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1562 /* src: associated STA */ 1563 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1564 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1565 1566 l2uf->dsap = 0; 1567 l2uf->ssap = 0; 1568 l2uf->control = 0xf5; 1569 l2uf->xid[0] = 0x81; 1570 l2uf->xid[1] = 0x80; 1571 l2uf->xid[2] = 0x00; 1572 1573 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1574 hostap_deliver_data(vap, ni, m); 1575 } 1576 1577 static void 1578 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1579 int reassoc, int resp, const char *tag, int rate) 1580 { 1581 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1582 "deny %s request, %s rate set mismatch, rate/MCS %d", 1583 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1584 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1585 ieee80211_node_leave(ni); 1586 } 1587 1588 static void 1589 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1590 int reassoc, int resp, const char *tag, int capinfo) 1591 { 1592 struct ieee80211vap *vap = ni->ni_vap; 1593 1594 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1595 "deny %s request, %s mismatch 0x%x", 1596 reassoc ? "reassoc" : "assoc", tag, capinfo); 1597 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1598 ieee80211_node_leave(ni); 1599 vap->iv_stats.is_rx_assoc_capmismatch++; 1600 } 1601 1602 static void 1603 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1604 int reassoc, int resp) 1605 { 1606 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1607 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1608 /* XXX no better code */ 1609 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1610 ieee80211_node_leave(ni); 1611 } 1612 1613 static void 1614 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1615 int algo, int seq, int status) 1616 { 1617 struct ieee80211vap *vap = ni->ni_vap; 1618 1619 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1620 wh, NULL, "unsupported alg %d", algo); 1621 vap->iv_stats.is_rx_auth_unsupported++; 1622 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1623 seq | (status << 16)); 1624 } 1625 1626 static __inline int 1627 ishtmixed(const uint8_t *ie) 1628 { 1629 const struct ieee80211_ie_htinfo *ht = 1630 (const struct ieee80211_ie_htinfo *) ie; 1631 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1632 IEEE80211_HTINFO_OPMODE_MIXED; 1633 } 1634 1635 static int 1636 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1637 { 1638 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1639 int i; 1640 1641 /* NB: the 11b clients we care about will not have xrates */ 1642 if (xrates != NULL || rates == NULL) 1643 return 0; 1644 for (i = 0; i < rates[1]; i++) { 1645 int r = rates[2+i] & IEEE80211_RATE_VAL; 1646 if (r > 2*11 || ((1<<r) & brates) == 0) 1647 return 0; 1648 } 1649 return 1; 1650 } 1651 1652 static void 1653 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1654 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1655 { 1656 struct ieee80211vap *vap = ni->ni_vap; 1657 struct ieee80211com *ic = ni->ni_ic; 1658 struct ieee80211_frame *wh; 1659 uint8_t *frm, *efrm, *sfrm; 1660 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1661 int reassoc, resp; 1662 uint8_t rate; 1663 1664 wh = mtod(m0, struct ieee80211_frame *); 1665 frm = (uint8_t *)&wh[1]; 1666 efrm = mtod(m0, uint8_t *) + m0->m_len; 1667 switch (subtype) { 1668 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1669 /* 1670 * We process beacon/probe response frames when scanning; 1671 * otherwise we check beacon frames for overlapping non-ERP 1672 * BSS in 11g and/or overlapping legacy BSS when in HT. 1673 */ 1674 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 1675 vap->iv_stats.is_rx_mgtdiscard++; 1676 return; 1677 } 1678 /* FALLTHROUGH */ 1679 case IEEE80211_FC0_SUBTYPE_BEACON: { 1680 struct ieee80211_scanparams scan; 1681 1682 /* NB: accept off-channel frames */ 1683 /* XXX TODO: use rxstatus to determine off-channel details */ 1684 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1685 return; 1686 /* 1687 * Count frame now that we know it's to be processed. 1688 */ 1689 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1690 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1691 IEEE80211_NODE_STAT(ni, rx_beacons); 1692 } else 1693 IEEE80211_NODE_STAT(ni, rx_proberesp); 1694 /* 1695 * If scanning, just pass information to the scan module. 1696 */ 1697 if (ic->ic_flags & IEEE80211_F_SCAN) { 1698 if (scan.status == 0 && /* NB: on channel */ 1699 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1700 /* 1701 * Actively scanning a channel marked passive; 1702 * send a probe request now that we know there 1703 * is 802.11 traffic present. 1704 * 1705 * XXX check if the beacon we recv'd gives 1706 * us what we need and suppress the probe req 1707 */ 1708 ieee80211_probe_curchan(vap, 1); 1709 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1710 } 1711 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh, 1712 subtype, rssi, nf); 1713 return; 1714 } 1715 /* 1716 * Check beacon for overlapping bss w/ non ERP stations. 1717 * If we detect one and protection is configured but not 1718 * enabled, enable it and start a timer that'll bring us 1719 * out if we stop seeing the bss. 1720 */ 1721 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1722 scan.status == 0 && /* NB: on-channel */ 1723 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1724 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1725 ic->ic_lastnonerp = ticks; 1726 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1727 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1728 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1729 IEEE80211_NOTE_FRAME(vap, 1730 IEEE80211_MSG_ASSOC, wh, 1731 "non-ERP present on channel %d " 1732 "(saw erp 0x%x from channel %d), " 1733 "enable use of protection", 1734 ic->ic_curchan->ic_ieee, 1735 scan.erp, scan.chan); 1736 ic->ic_flags |= IEEE80211_F_USEPROT; 1737 ieee80211_notify_erp(ic); 1738 } 1739 } 1740 /* 1741 * Check beacon for non-HT station on HT channel 1742 * and update HT BSS occupancy as appropriate. 1743 */ 1744 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1745 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1746 /* 1747 * Off control channel; only check frames 1748 * that come in the extension channel when 1749 * operating w/ HT40. 1750 */ 1751 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1752 break; 1753 if (scan.chan != ic->ic_curchan->ic_extieee) 1754 break; 1755 } 1756 if (scan.htinfo == NULL) { 1757 ieee80211_htprot_update(ic, 1758 IEEE80211_HTINFO_OPMODE_PROTOPT | 1759 IEEE80211_HTINFO_NONHT_PRESENT); 1760 } else if (ishtmixed(scan.htinfo)) { 1761 /* XXX? take NONHT_PRESENT from beacon? */ 1762 ieee80211_htprot_update(ic, 1763 IEEE80211_HTINFO_OPMODE_MIXED | 1764 IEEE80211_HTINFO_NONHT_PRESENT); 1765 } 1766 } 1767 break; 1768 } 1769 1770 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1771 if (vap->iv_state != IEEE80211_S_RUN) { 1772 vap->iv_stats.is_rx_mgtdiscard++; 1773 return; 1774 } 1775 /* 1776 * Consult the ACL policy module if setup. 1777 */ 1778 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1779 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1780 wh, NULL, "%s", "disallowed by ACL"); 1781 vap->iv_stats.is_rx_acl++; 1782 return; 1783 } 1784 /* 1785 * prreq frame format 1786 * [tlv] ssid 1787 * [tlv] supported rates 1788 * [tlv] extended supported rates 1789 */ 1790 ssid = rates = xrates = NULL; 1791 while (efrm - frm > 1) { 1792 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1793 switch (*frm) { 1794 case IEEE80211_ELEMID_SSID: 1795 ssid = frm; 1796 break; 1797 case IEEE80211_ELEMID_RATES: 1798 rates = frm; 1799 break; 1800 case IEEE80211_ELEMID_XRATES: 1801 xrates = frm; 1802 break; 1803 } 1804 frm += frm[1] + 2; 1805 } 1806 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1807 if (xrates != NULL) 1808 IEEE80211_VERIFY_ELEMENT(xrates, 1809 IEEE80211_RATE_MAXSIZE - rates[1], return); 1810 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1811 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1812 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1813 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1814 wh, NULL, 1815 "%s", "no ssid with ssid suppression enabled"); 1816 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1817 return; 1818 } 1819 1820 /* XXX find a better class or define it's own */ 1821 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1822 "%s", "recv probe req"); 1823 /* 1824 * Some legacy 11b clients cannot hack a complete 1825 * probe response frame. When the request includes 1826 * only a bare-bones rate set, communicate this to 1827 * the transmit side. 1828 */ 1829 ieee80211_send_proberesp(vap, wh->i_addr2, 1830 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1831 break; 1832 1833 case IEEE80211_FC0_SUBTYPE_AUTH: { 1834 uint16_t algo, seq, status; 1835 1836 if (vap->iv_state != IEEE80211_S_RUN) { 1837 vap->iv_stats.is_rx_mgtdiscard++; 1838 return; 1839 } 1840 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1841 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1842 wh, NULL, "%s", "wrong bssid"); 1843 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1844 return; 1845 } 1846 /* 1847 * auth frame format 1848 * [2] algorithm 1849 * [2] sequence 1850 * [2] status 1851 * [tlv*] challenge 1852 */ 1853 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1854 algo = le16toh(*(uint16_t *)frm); 1855 seq = le16toh(*(uint16_t *)(frm + 2)); 1856 status = le16toh(*(uint16_t *)(frm + 4)); 1857 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1858 "recv auth frame with algorithm %d seq %d", algo, seq); 1859 /* 1860 * Consult the ACL policy module if setup. 1861 */ 1862 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1863 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1864 wh, NULL, "%s", "disallowed by ACL"); 1865 vap->iv_stats.is_rx_acl++; 1866 ieee80211_send_error(ni, wh->i_addr2, 1867 IEEE80211_FC0_SUBTYPE_AUTH, 1868 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1869 return; 1870 } 1871 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1872 IEEE80211_DISCARD(vap, 1873 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1874 wh, NULL, "%s", "TKIP countermeasures enabled"); 1875 vap->iv_stats.is_rx_auth_countermeasures++; 1876 ieee80211_send_error(ni, wh->i_addr2, 1877 IEEE80211_FC0_SUBTYPE_AUTH, 1878 IEEE80211_REASON_MIC_FAILURE); 1879 return; 1880 } 1881 if (algo == IEEE80211_AUTH_ALG_SHARED) 1882 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1883 seq, status); 1884 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1885 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1886 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1887 authalgreject(ni, wh, algo, 1888 seq+1, IEEE80211_STATUS_ALG); 1889 return; 1890 } else { 1891 /* 1892 * We assume that an unknown algorithm is the result 1893 * of a decryption failure on a shared key auth frame; 1894 * return a status code appropriate for that instead 1895 * of IEEE80211_STATUS_ALG. 1896 * 1897 * NB: a seq# of 4 is intentional; the decrypted 1898 * frame likely has a bogus seq value. 1899 */ 1900 authalgreject(ni, wh, algo, 1901 4, IEEE80211_STATUS_CHALLENGE); 1902 return; 1903 } 1904 break; 1905 } 1906 1907 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1908 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1909 uint16_t capinfo, lintval; 1910 struct ieee80211_rsnparms rsnparms; 1911 1912 if (vap->iv_state != IEEE80211_S_RUN) { 1913 vap->iv_stats.is_rx_mgtdiscard++; 1914 return; 1915 } 1916 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1917 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1918 wh, NULL, "%s", "wrong bssid"); 1919 vap->iv_stats.is_rx_assoc_bss++; 1920 return; 1921 } 1922 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1923 reassoc = 1; 1924 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1925 } else { 1926 reassoc = 0; 1927 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1928 } 1929 if (ni == vap->iv_bss) { 1930 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1931 "deny %s request, sta not authenticated", 1932 reassoc ? "reassoc" : "assoc"); 1933 ieee80211_send_error(ni, wh->i_addr2, 1934 IEEE80211_FC0_SUBTYPE_DEAUTH, 1935 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1936 vap->iv_stats.is_rx_assoc_notauth++; 1937 return; 1938 } 1939 1940 /* 1941 * asreq frame format 1942 * [2] capability information 1943 * [2] listen interval 1944 * [6*] current AP address (reassoc only) 1945 * [tlv] ssid 1946 * [tlv] supported rates 1947 * [tlv] extended supported rates 1948 * [tlv] WPA or RSN 1949 * [tlv] HT capabilities 1950 * [tlv] Atheros capabilities 1951 */ 1952 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1953 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1954 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1955 if (reassoc) 1956 frm += 6; /* ignore current AP info */ 1957 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1958 sfrm = frm; 1959 while (efrm - frm > 1) { 1960 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1961 switch (*frm) { 1962 case IEEE80211_ELEMID_SSID: 1963 ssid = frm; 1964 break; 1965 case IEEE80211_ELEMID_RATES: 1966 rates = frm; 1967 break; 1968 case IEEE80211_ELEMID_XRATES: 1969 xrates = frm; 1970 break; 1971 case IEEE80211_ELEMID_RSN: 1972 rsn = frm; 1973 break; 1974 case IEEE80211_ELEMID_HTCAP: 1975 htcap = frm; 1976 break; 1977 case IEEE80211_ELEMID_VENDOR: 1978 if (iswpaoui(frm)) 1979 wpa = frm; 1980 else if (iswmeinfo(frm)) 1981 wme = frm; 1982 #ifdef IEEE80211_SUPPORT_SUPERG 1983 else if (isatherosoui(frm)) 1984 ath = frm; 1985 #endif 1986 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1987 if (ishtcapoui(frm) && htcap == NULL) 1988 htcap = frm; 1989 } 1990 break; 1991 } 1992 frm += frm[1] + 2; 1993 } 1994 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1995 if (xrates != NULL) 1996 IEEE80211_VERIFY_ELEMENT(xrates, 1997 IEEE80211_RATE_MAXSIZE - rates[1], return); 1998 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1999 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2000 if (htcap != NULL) { 2001 IEEE80211_VERIFY_LENGTH(htcap[1], 2002 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2003 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2004 sizeof(struct ieee80211_ie_htcap)-2, 2005 return); /* XXX just NULL out? */ 2006 } 2007 2008 if ((vap->iv_flags & IEEE80211_F_WPA) && 2009 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2010 return; 2011 /* discard challenge after association */ 2012 if (ni->ni_challenge != NULL) { 2013 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 2014 ni->ni_challenge = NULL; 2015 } 2016 /* NB: 802.11 spec says to ignore station's privacy bit */ 2017 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2018 capinfomismatch(ni, wh, reassoc, resp, 2019 "capability", capinfo); 2020 return; 2021 } 2022 /* 2023 * Disallow re-associate w/ invalid slot time setting. 2024 */ 2025 if (ni->ni_associd != 0 && 2026 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2027 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2028 capinfomismatch(ni, wh, reassoc, resp, 2029 "slot time", capinfo); 2030 return; 2031 } 2032 rate = ieee80211_setup_rates(ni, rates, xrates, 2033 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2034 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2035 if (rate & IEEE80211_RATE_BASIC) { 2036 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2037 vap->iv_stats.is_rx_assoc_norate++; 2038 return; 2039 } 2040 /* 2041 * If constrained to 11g-only stations reject an 2042 * 11b-only station. We cheat a bit here by looking 2043 * at the max negotiated xmit rate and assuming anyone 2044 * with a best rate <24Mb/s is an 11b station. 2045 */ 2046 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2047 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2048 vap->iv_stats.is_rx_assoc_norate++; 2049 return; 2050 } 2051 /* 2052 * Do HT rate set handling and setup HT node state. 2053 */ 2054 ni->ni_chan = vap->iv_bss->ni_chan; 2055 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2056 rate = ieee80211_setup_htrates(ni, htcap, 2057 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2058 IEEE80211_F_DOBRS); 2059 if (rate & IEEE80211_RATE_BASIC) { 2060 ratesetmismatch(ni, wh, reassoc, resp, 2061 "HT", rate); 2062 vap->iv_stats.is_ht_assoc_norate++; 2063 return; 2064 } 2065 ieee80211_ht_node_init(ni); 2066 ieee80211_ht_updatehtcap(ni, htcap); 2067 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2068 ieee80211_ht_node_cleanup(ni); 2069 #ifdef IEEE80211_SUPPORT_SUPERG 2070 /* Always do ff node cleanup; for A-MSDU */ 2071 ieee80211_ff_node_cleanup(ni); 2072 #endif 2073 /* 2074 * Allow AMPDU operation only with unencrypted traffic 2075 * or AES-CCM; the 11n spec only specifies these ciphers 2076 * so permitting any others is undefined and can lead 2077 * to interoperability problems. 2078 */ 2079 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2080 (((vap->iv_flags & IEEE80211_F_WPA) && 2081 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2082 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2083 IEEE80211_NOTE(vap, 2084 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2085 "disallow HT use because WEP or TKIP requested, " 2086 "capinfo 0x%x ucastcipher %d", capinfo, 2087 rsnparms.rsn_ucastcipher); 2088 ieee80211_ht_node_cleanup(ni); 2089 #ifdef IEEE80211_SUPPORT_SUPERG 2090 /* Always do ff node cleanup; for A-MSDU */ 2091 ieee80211_ff_node_cleanup(ni); 2092 #endif 2093 vap->iv_stats.is_ht_assoc_downgrade++; 2094 } 2095 /* 2096 * If constrained to 11n-only stations reject legacy stations. 2097 */ 2098 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2099 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2100 htcapmismatch(ni, wh, reassoc, resp); 2101 vap->iv_stats.is_ht_assoc_nohtcap++; 2102 return; 2103 } 2104 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2105 ni->ni_noise = nf; 2106 ni->ni_intval = lintval; 2107 ni->ni_capinfo = capinfo; 2108 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2109 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2110 /* 2111 * Store the IEs. 2112 * XXX maybe better to just expand 2113 */ 2114 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2115 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2116 if (wpa != NULL) 2117 setie(wpa_ie, wpa - sfrm); 2118 if (rsn != NULL) 2119 setie(rsn_ie, rsn - sfrm); 2120 if (htcap != NULL) 2121 setie(htcap_ie, htcap - sfrm); 2122 if (wme != NULL) { 2123 setie(wme_ie, wme - sfrm); 2124 /* 2125 * Mark node as capable of QoS. 2126 */ 2127 ni->ni_flags |= IEEE80211_NODE_QOS; 2128 } else 2129 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2130 #ifdef IEEE80211_SUPPORT_SUPERG 2131 if (ath != NULL) { 2132 setie(ath_ie, ath - sfrm); 2133 /* 2134 * Parse ATH station parameters. 2135 */ 2136 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2137 } else 2138 #endif 2139 ni->ni_ath_flags = 0; 2140 #undef setie 2141 } else { 2142 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2143 ni->ni_ath_flags = 0; 2144 } 2145 ieee80211_node_join(ni, resp); 2146 ieee80211_deliver_l2uf(ni); 2147 break; 2148 } 2149 2150 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2151 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2152 uint16_t reason; 2153 2154 if (vap->iv_state != IEEE80211_S_RUN || 2155 /* NB: can happen when in promiscuous mode */ 2156 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2157 vap->iv_stats.is_rx_mgtdiscard++; 2158 break; 2159 } 2160 /* 2161 * deauth/disassoc frame format 2162 * [2] reason 2163 */ 2164 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2165 reason = le16toh(*(uint16_t *)frm); 2166 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2167 vap->iv_stats.is_rx_deauth++; 2168 IEEE80211_NODE_STAT(ni, rx_deauth); 2169 } else { 2170 vap->iv_stats.is_rx_disassoc++; 2171 IEEE80211_NODE_STAT(ni, rx_disassoc); 2172 } 2173 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2174 "recv %s (reason: %d (%s))", 2175 ieee80211_mgt_subtype_name(subtype), 2176 reason, ieee80211_reason_to_string(reason)); 2177 if (ni != vap->iv_bss) 2178 ieee80211_node_leave(ni); 2179 break; 2180 } 2181 2182 case IEEE80211_FC0_SUBTYPE_ACTION: 2183 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2184 if (ni == vap->iv_bss) { 2185 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2186 wh, NULL, "%s", "unknown node"); 2187 vap->iv_stats.is_rx_mgtdiscard++; 2188 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2189 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2190 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2191 wh, NULL, "%s", "not for us"); 2192 vap->iv_stats.is_rx_mgtdiscard++; 2193 } else if (vap->iv_state != IEEE80211_S_RUN) { 2194 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2195 wh, NULL, "wrong state %s", 2196 ieee80211_state_name[vap->iv_state]); 2197 vap->iv_stats.is_rx_mgtdiscard++; 2198 } else { 2199 if (ieee80211_parse_action(ni, m0) == 0) 2200 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2201 } 2202 break; 2203 2204 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2205 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2206 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 2207 case IEEE80211_FC0_SUBTYPE_ATIM: 2208 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2209 wh, NULL, "%s", "not handled"); 2210 vap->iv_stats.is_rx_mgtdiscard++; 2211 break; 2212 2213 default: 2214 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2215 wh, "mgt", "subtype 0x%x not handled", subtype); 2216 vap->iv_stats.is_rx_badsubtype++; 2217 break; 2218 } 2219 } 2220 2221 static void 2222 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2223 { 2224 switch (subtype) { 2225 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2226 ni->ni_vap->iv_recv_pspoll(ni, m); 2227 break; 2228 case IEEE80211_FC0_SUBTYPE_BAR: 2229 ieee80211_recv_bar(ni, m); 2230 break; 2231 } 2232 } 2233 2234 /* 2235 * Process a received ps-poll frame. 2236 */ 2237 void 2238 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2239 { 2240 struct ieee80211vap *vap = ni->ni_vap; 2241 struct ieee80211com *ic = vap->iv_ic; 2242 struct ieee80211_frame_min *wh; 2243 struct mbuf *m; 2244 uint16_t aid; 2245 int qlen; 2246 2247 wh = mtod(m0, struct ieee80211_frame_min *); 2248 if (ni->ni_associd == 0) { 2249 IEEE80211_DISCARD(vap, 2250 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2251 (struct ieee80211_frame *) wh, NULL, 2252 "%s", "unassociated station"); 2253 vap->iv_stats.is_ps_unassoc++; 2254 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2255 IEEE80211_REASON_NOT_ASSOCED); 2256 return; 2257 } 2258 2259 aid = le16toh(*(uint16_t *)wh->i_dur); 2260 if (aid != ni->ni_associd) { 2261 IEEE80211_DISCARD(vap, 2262 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2263 (struct ieee80211_frame *) wh, NULL, 2264 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2265 ni->ni_associd, aid); 2266 vap->iv_stats.is_ps_badaid++; 2267 /* 2268 * NB: We used to deauth the station but it turns out 2269 * the Blackberry Curve 8230 (and perhaps other devices) 2270 * sometimes send the wrong AID when WME is negotiated. 2271 * Being more lenient here seems ok as we already check 2272 * the station is associated and we only return frames 2273 * queued for the station (i.e. we don't use the AID). 2274 */ 2275 return; 2276 } 2277 2278 /* Okay, take the first queued packet and put it out... */ 2279 m = ieee80211_node_psq_dequeue(ni, &qlen); 2280 if (m == NULL) { 2281 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2282 "%s", "recv ps-poll, but queue empty"); 2283 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2284 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2285 if (vap->iv_set_tim != NULL) 2286 vap->iv_set_tim(ni, 0); /* just in case */ 2287 return; 2288 } 2289 /* 2290 * If there are more packets, set the more packets bit 2291 * in the packet dispatched to the station; otherwise 2292 * turn off the TIM bit. 2293 */ 2294 if (qlen != 0) { 2295 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2296 "recv ps-poll, send packet, %u still queued", qlen); 2297 m->m_flags |= M_MORE_DATA; 2298 } else { 2299 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2300 "%s", "recv ps-poll, send packet, queue empty"); 2301 if (vap->iv_set_tim != NULL) 2302 vap->iv_set_tim(ni, 0); 2303 } 2304 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2305 2306 /* 2307 * Do the right thing; if it's an encap'ed frame then 2308 * call ieee80211_parent_xmitpkt() else 2309 * call ieee80211_vap_xmitpkt(). 2310 */ 2311 if (m->m_flags & M_ENCAP) { 2312 (void) ieee80211_parent_xmitpkt(ic, m); 2313 } else { 2314 (void) ieee80211_vap_xmitpkt(vap, m); 2315 } 2316 }
Cache object: 61e0f28cd5f8d8f360b7a9fc4fb062fd
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