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 * $FreeBSD: head/sys/net80211/ieee80211_hostap.c 203422 2010-02-03 10:07:43Z rpaulo $ 26 */ 27 28 /* 29 * IEEE 802.11 HOSTAP mode support. 30 */ 31 #include "opt_inet.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_media.h> 49 #include <net/if_llc.h> 50 #include <net/ethernet.h> 51 #include <net/route.h> 52 53 #include <net/bpf.h> 54 55 #include <netproto/802_11/ieee80211_var.h> 56 #include <netproto/802_11/ieee80211_hostap.h> 57 #include <netproto/802_11/ieee80211_input.h> 58 #ifdef IEEE80211_SUPPORT_SUPERG 59 #include <netproto/802_11/ieee80211_superg.h> 60 #endif 61 #include <netproto/802_11/ieee80211_wds.h> 62 63 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 64 65 static void hostap_vattach(struct ieee80211vap *); 66 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 67 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 68 int rssi, int nf); 69 static void hostap_deliver_data(struct ieee80211vap *, 70 struct ieee80211_node *, struct mbuf *); 71 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 72 int subtype, int rssi, int nf); 73 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 74 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *); 75 76 void 77 ieee80211_hostap_attach(struct ieee80211com *ic) 78 { 79 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 80 } 81 82 void 83 ieee80211_hostap_detach(struct ieee80211com *ic) 84 { 85 } 86 87 static void 88 hostap_vdetach(struct ieee80211vap *vap) 89 { 90 } 91 92 static void 93 hostap_vattach(struct ieee80211vap *vap) 94 { 95 vap->iv_newstate = hostap_newstate; 96 vap->iv_input = hostap_input; 97 vap->iv_recv_mgmt = hostap_recv_mgmt; 98 vap->iv_recv_ctl = hostap_recv_ctl; 99 vap->iv_opdetach = hostap_vdetach; 100 vap->iv_deliver_data = hostap_deliver_data; 101 } 102 103 static void 104 sta_disassoc(void *arg, struct ieee80211_node *ni) 105 { 106 struct ieee80211vap *vap = arg; 107 108 if (ni->ni_vap == vap && ni->ni_associd != 0) { 109 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 110 IEEE80211_REASON_ASSOC_LEAVE); 111 ieee80211_node_leave(ni); 112 } 113 } 114 115 static void 116 sta_csa(void *arg, struct ieee80211_node *ni) 117 { 118 struct ieee80211vap *vap = arg; 119 120 if (ni->ni_vap == vap && ni->ni_associd != 0) 121 if (ni->ni_inact > vap->iv_inact_init) { 122 ni->ni_inact = vap->iv_inact_init; 123 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 124 "%s: inact %u", __func__, ni->ni_inact); 125 } 126 } 127 128 static void 129 sta_drop(void *arg, struct ieee80211_node *ni) 130 { 131 struct ieee80211vap *vap = arg; 132 133 if (ni->ni_vap == vap && ni->ni_associd != 0) 134 ieee80211_node_leave(ni); 135 } 136 137 /* 138 * Does a channel change require associated stations to re-associate 139 * so protocol state is correct. This is used when doing CSA across 140 * bands or similar (e.g. HT -> legacy). 141 */ 142 static int 143 isbandchange(struct ieee80211com *ic) 144 { 145 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 146 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 147 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 148 } 149 150 /* 151 * IEEE80211_M_HOSTAP vap state machine handler. 152 */ 153 static int 154 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 155 { 156 struct ieee80211com *ic = vap->iv_ic; 157 enum ieee80211_state ostate; 158 159 ostate = vap->iv_state; 160 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 161 __func__, ieee80211_state_name[ostate], 162 ieee80211_state_name[nstate], arg); 163 vap->iv_state = nstate; /* state transition */ 164 if (ostate != IEEE80211_S_SCAN) 165 ieee80211_cancel_scan(vap); /* background scan */ 166 switch (nstate) { 167 case IEEE80211_S_INIT: 168 switch (ostate) { 169 case IEEE80211_S_SCAN: 170 ieee80211_cancel_scan(vap); 171 break; 172 case IEEE80211_S_CAC: 173 ieee80211_dfs_cac_stop(vap); 174 break; 175 case IEEE80211_S_RUN: 176 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 177 break; 178 default: 179 break; 180 } 181 if (ostate != IEEE80211_S_INIT) { 182 /* NB: optimize INIT -> INIT case */ 183 ieee80211_reset_bss(vap); 184 } 185 if (vap->iv_auth->ia_detach != NULL) 186 vap->iv_auth->ia_detach(vap); 187 break; 188 case IEEE80211_S_SCAN: 189 switch (ostate) { 190 case IEEE80211_S_CSA: 191 case IEEE80211_S_RUN: 192 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 193 /* 194 * Clear overlapping BSS state; the beacon frame 195 * will be reconstructed on transition to the RUN 196 * state and the timeout routines check if the flag 197 * is set before doing anything so this is sufficient. 198 */ 199 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 200 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 201 /* fall thru... */ 202 case IEEE80211_S_CAC: 203 /* 204 * NB: We may get here because of a manual channel 205 * change in which case we need to stop CAC 206 * XXX no need to stop if ostate RUN but it's ok 207 */ 208 ieee80211_dfs_cac_stop(vap); 209 /* fall thru... */ 210 case IEEE80211_S_INIT: 211 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 212 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 213 /* 214 * Already have a channel; bypass the 215 * scan and startup immediately. 216 * ieee80211_create_ibss will call back to 217 * move us to RUN state. 218 */ 219 ieee80211_create_ibss(vap, vap->iv_des_chan); 220 break; 221 } 222 /* 223 * Initiate a scan. We can come here as a result 224 * of an IEEE80211_IOC_SCAN_REQ too in which case 225 * the vap will be marked with IEEE80211_FEXT_SCANREQ 226 * and the scan request parameters will be present 227 * in iv_scanreq. Otherwise we do the default. 228 */ 229 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 230 ieee80211_check_scan(vap, 231 vap->iv_scanreq_flags, 232 vap->iv_scanreq_duration, 233 vap->iv_scanreq_mindwell, 234 vap->iv_scanreq_maxdwell, 235 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 236 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 237 } else 238 ieee80211_check_scan_current(vap); 239 break; 240 case IEEE80211_S_SCAN: 241 /* 242 * A state change requires a reset; scan. 243 */ 244 ieee80211_check_scan_current(vap); 245 break; 246 default: 247 break; 248 } 249 break; 250 case IEEE80211_S_CAC: 251 /* 252 * Start CAC on a DFS channel. We come here when starting 253 * a bss on a DFS channel (see ieee80211_create_ibss). 254 */ 255 ieee80211_dfs_cac_start(vap); 256 break; 257 case IEEE80211_S_RUN: 258 if (vap->iv_flags & IEEE80211_F_WPA) { 259 /* XXX validate prerequisites */ 260 } 261 switch (ostate) { 262 case IEEE80211_S_INIT: 263 /* 264 * Already have a channel; bypass the 265 * scan and startup immediately. 266 * Note that ieee80211_create_ibss will call 267 * back to do a RUN->RUN state change. 268 */ 269 ieee80211_create_ibss(vap, 270 ieee80211_ht_adjust_channel(ic, 271 ic->ic_curchan, vap->iv_flags_ht)); 272 /* NB: iv_bss is changed on return */ 273 break; 274 case IEEE80211_S_CAC: 275 /* 276 * NB: This is the normal state change when CAC 277 * expires and no radar was detected; no need to 278 * clear the CAC timer as it's already expired. 279 */ 280 /* fall thru... */ 281 case IEEE80211_S_CSA: 282 /* 283 * Shorten inactivity timer of associated stations 284 * to weed out sta's that don't follow a CSA. 285 */ 286 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 287 /* 288 * Update bss node channel to reflect where 289 * we landed after CSA. 290 */ 291 ieee80211_node_set_chan(vap->iv_bss, 292 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 293 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 294 /* XXX bypass debug msgs */ 295 break; 296 case IEEE80211_S_SCAN: 297 case IEEE80211_S_RUN: 298 #ifdef IEEE80211_DEBUG 299 if (ieee80211_msg_debug(vap)) { 300 struct ieee80211_node *ni = vap->iv_bss; 301 ieee80211_note(vap, 302 "synchronized with %6D ssid ", 303 ni->ni_bssid, ":"); 304 ieee80211_print_essid(ni->ni_essid, 305 ni->ni_esslen); 306 /* XXX MCS/HT */ 307 kprintf(" channel %d start %uMb\n", 308 ieee80211_chan2ieee(ic, ic->ic_curchan), 309 IEEE80211_RATE2MBS(ni->ni_txrate)); 310 } 311 #endif 312 break; 313 default: 314 break; 315 } 316 /* 317 * Start/stop the authenticator. We delay until here 318 * to allow configuration to happen out of order. 319 */ 320 if (vap->iv_auth->ia_attach != NULL) { 321 /* XXX check failure */ 322 vap->iv_auth->ia_attach(vap); 323 } else if (vap->iv_auth->ia_detach != NULL) { 324 vap->iv_auth->ia_detach(vap); 325 } 326 ieee80211_node_authorize(vap->iv_bss); 327 break; 328 case IEEE80211_S_CSA: 329 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 330 /* 331 * On a ``band change'' silently drop associated 332 * stations as they must re-associate before they 333 * can pass traffic (as otherwise protocol state 334 * such as capabilities and the negotiated rate 335 * set may/will be wrong). 336 */ 337 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 338 } 339 break; 340 default: 341 break; 342 } 343 return 0; 344 } 345 346 static void 347 hostap_deliver_data(struct ieee80211vap *vap, 348 struct ieee80211_node *ni, struct mbuf *m) 349 { 350 struct ether_header *eh = mtod(m, struct ether_header *); 351 struct ifnet *ifp = vap->iv_ifp; 352 353 /* clear driver/net80211 flags before passing up */ 354 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 355 356 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 357 ("gack, opmode %d", vap->iv_opmode)); 358 /* 359 * Do accounting. 360 */ 361 ifp->if_ipackets++; 362 IEEE80211_NODE_STAT(ni, rx_data); 363 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 364 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 365 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 366 IEEE80211_NODE_STAT(ni, rx_mcast); 367 } else 368 IEEE80211_NODE_STAT(ni, rx_ucast); 369 370 /* perform as a bridge within the AP */ 371 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 372 struct mbuf *mcopy = NULL; 373 374 if (m->m_flags & M_MCAST) { 375 mcopy = m_dup(m, MB_DONTWAIT); 376 if (mcopy == NULL) 377 ifp->if_oerrors++; 378 else 379 mcopy->m_flags |= M_MCAST; 380 } else { 381 /* 382 * Check if the destination is associated with the 383 * same vap and authorized to receive traffic. 384 * Beware of traffic destined for the vap itself; 385 * sending it will not work; just let it be delivered 386 * normally. 387 */ 388 struct ieee80211_node *sta = ieee80211_find_vap_node( 389 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 390 if (sta != NULL) { 391 if (ieee80211_node_is_authorized(sta)) { 392 /* 393 * Beware of sending to ourself; this 394 * needs to happen via the normal 395 * input path. 396 */ 397 if (sta != vap->iv_bss) { 398 mcopy = m; 399 m = NULL; 400 } 401 } else { 402 vap->iv_stats.is_rx_unauth++; 403 IEEE80211_NODE_STAT(sta, rx_unauth); 404 } 405 ieee80211_free_node(sta); 406 } 407 } 408 if (mcopy != NULL) { 409 int len, err; 410 len = mcopy->m_pkthdr.len; 411 err = ieee80211_handoff(ifp, mcopy); 412 if (err) { 413 /* NB: IFQ_HANDOFF reclaims mcopy */ 414 } else { 415 ifp->if_opackets++; 416 } 417 } 418 } 419 if (m != NULL) { 420 /* 421 * Mark frame as coming from vap's interface. 422 */ 423 m->m_pkthdr.rcvif = ifp; 424 if (m->m_flags & M_MCAST) { 425 /* 426 * Spam DWDS vap's w/ multicast traffic. 427 */ 428 /* XXX only if dwds in use? */ 429 ieee80211_dwds_mcast(vap, m); 430 } 431 if (ni->ni_vlan != 0) { 432 /* attach vlan tag */ 433 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 434 m->m_flags |= M_VLANTAG; 435 } 436 ifp->if_input(ifp, m); 437 } 438 } 439 440 /* 441 * Decide if a received management frame should be 442 * printed when debugging is enabled. This filters some 443 * of the less interesting frames that come frequently 444 * (e.g. beacons). 445 */ 446 static __inline int 447 doprint(struct ieee80211vap *vap, int subtype) 448 { 449 switch (subtype) { 450 case IEEE80211_FC0_SUBTYPE_BEACON: 451 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 452 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 453 return 0; 454 } 455 return 1; 456 } 457 458 /* 459 * Process a received frame. The node associated with the sender 460 * should be supplied. If nothing was found in the node table then 461 * the caller is assumed to supply a reference to iv_bss instead. 462 * The RSSI and a timestamp are also supplied. The RSSI data is used 463 * during AP scanning to select a AP to associate with; it can have 464 * any units so long as values have consistent units and higher values 465 * mean ``better signal''. The receive timestamp is currently not used 466 * by the 802.11 layer. 467 */ 468 static int 469 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 470 { 471 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 472 #define HAS_SEQ(type) ((type & 0x4) == 0) 473 struct ieee80211vap *vap = ni->ni_vap; 474 struct ieee80211com *ic = ni->ni_ic; 475 struct ifnet *ifp = vap->iv_ifp; 476 struct ieee80211_frame *wh; 477 struct ieee80211_key *key; 478 struct ether_header *eh; 479 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 480 uint8_t dir, type, subtype, qos; 481 uint8_t *bssid; 482 uint16_t rxseq; 483 484 if (m->m_flags & M_AMPDU_MPDU) { 485 /* 486 * Fastpath for A-MPDU reorder q resubmission. Frames 487 * w/ M_AMPDU_MPDU marked have already passed through 488 * here but were received out of order and been held on 489 * the reorder queue. When resubmitted they are marked 490 * with the M_AMPDU_MPDU flag and we can bypass most of 491 * the normal processing. 492 */ 493 wh = mtod(m, struct ieee80211_frame *); 494 type = IEEE80211_FC0_TYPE_DATA; 495 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 496 subtype = IEEE80211_FC0_SUBTYPE_QOS; 497 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 498 goto resubmit_ampdu; 499 } 500 501 KASSERT(ni != NULL, ("null node")); 502 ni->ni_inact = ni->ni_inact_reload; 503 504 type = -1; /* undefined */ 505 506 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 507 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 508 ni->ni_macaddr, NULL, 509 "too short (1): len %u", m->m_pkthdr.len); 510 vap->iv_stats.is_rx_tooshort++; 511 goto out; 512 } 513 /* 514 * Bit of a cheat here, we use a pointer for a 3-address 515 * frame format but don't reference fields past outside 516 * ieee80211_frame_min w/o first validating the data is 517 * present. 518 */ 519 wh = mtod(m, struct ieee80211_frame *); 520 521 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 522 IEEE80211_FC0_VERSION_0) { 523 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 524 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 525 wh->i_fc[0], wh->i_fc[1]); 526 vap->iv_stats.is_rx_badversion++; 527 goto err; 528 } 529 530 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 531 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 532 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 533 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 534 if (dir != IEEE80211_FC1_DIR_NODS) 535 bssid = wh->i_addr1; 536 else if (type == IEEE80211_FC0_TYPE_CTL) 537 bssid = wh->i_addr1; 538 else { 539 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 540 IEEE80211_DISCARD_MAC(vap, 541 IEEE80211_MSG_ANY, ni->ni_macaddr, 542 NULL, "too short (2): len %u", 543 m->m_pkthdr.len); 544 vap->iv_stats.is_rx_tooshort++; 545 goto out; 546 } 547 bssid = wh->i_addr3; 548 } 549 /* 550 * Validate the bssid. 551 */ 552 if (!(type == IEEE80211_FC0_TYPE_MGT && 553 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 554 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 555 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 556 /* not interested in */ 557 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 558 bssid, NULL, "%s", "not to bss"); 559 vap->iv_stats.is_rx_wrongbss++; 560 goto out; 561 } 562 563 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 564 ni->ni_noise = nf; 565 if (HAS_SEQ(type)) { 566 uint8_t tid = ieee80211_gettid(wh); 567 if (IEEE80211_QOS_HAS_SEQ(wh) && 568 TID_TO_WME_AC(tid) >= WME_AC_VI) 569 ic->ic_wme.wme_hipri_traffic++; 570 rxseq = le16toh(*(uint16_t *)wh->i_seq); 571 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 572 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 573 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 574 /* duplicate, discard */ 575 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 576 bssid, "duplicate", 577 "seqno <%u,%u> fragno <%u,%u> tid %u", 578 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 579 ni->ni_rxseqs[tid] >> 580 IEEE80211_SEQ_SEQ_SHIFT, 581 rxseq & IEEE80211_SEQ_FRAG_MASK, 582 ni->ni_rxseqs[tid] & 583 IEEE80211_SEQ_FRAG_MASK, 584 tid); 585 vap->iv_stats.is_rx_dup++; 586 IEEE80211_NODE_STAT(ni, rx_dup); 587 goto out; 588 } 589 ni->ni_rxseqs[tid] = rxseq; 590 } 591 } 592 593 switch (type) { 594 case IEEE80211_FC0_TYPE_DATA: 595 hdrspace = ieee80211_hdrspace(ic, wh); 596 if (m->m_len < hdrspace && 597 (m = m_pullup(m, hdrspace)) == NULL) { 598 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 599 ni->ni_macaddr, NULL, 600 "data too short: expecting %u", hdrspace); 601 vap->iv_stats.is_rx_tooshort++; 602 goto out; /* XXX */ 603 } 604 if (!(dir == IEEE80211_FC1_DIR_TODS || 605 (dir == IEEE80211_FC1_DIR_DSTODS && 606 (vap->iv_flags & IEEE80211_F_DWDS)))) { 607 if (dir != IEEE80211_FC1_DIR_DSTODS) { 608 IEEE80211_DISCARD(vap, 609 IEEE80211_MSG_INPUT, wh, "data", 610 "incorrect dir 0x%x", dir); 611 } else { 612 IEEE80211_DISCARD(vap, 613 IEEE80211_MSG_INPUT | 614 IEEE80211_MSG_WDS, wh, 615 "4-address data", 616 "%s", "DWDS not enabled"); 617 } 618 vap->iv_stats.is_rx_wrongdir++; 619 goto out; 620 } 621 /* check if source STA is associated */ 622 if (ni == vap->iv_bss) { 623 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 624 wh, "data", "%s", "unknown src"); 625 ieee80211_send_error(ni, wh->i_addr2, 626 IEEE80211_FC0_SUBTYPE_DEAUTH, 627 IEEE80211_REASON_NOT_AUTHED); 628 vap->iv_stats.is_rx_notassoc++; 629 goto err; 630 } 631 if (ni->ni_associd == 0) { 632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 633 wh, "data", "%s", "unassoc src"); 634 IEEE80211_SEND_MGMT(ni, 635 IEEE80211_FC0_SUBTYPE_DISASSOC, 636 IEEE80211_REASON_NOT_ASSOCED); 637 vap->iv_stats.is_rx_notassoc++; 638 goto err; 639 } 640 641 /* 642 * Check for power save state change. 643 * XXX out-of-order A-MPDU frames? 644 */ 645 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 646 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 647 ieee80211_node_pwrsave(ni, 648 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 649 /* 650 * For 4-address packets handle WDS discovery 651 * notifications. Once a WDS link is setup frames 652 * are just delivered to the WDS vap (see below). 653 */ 654 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 655 if (!ieee80211_node_is_authorized(ni)) { 656 IEEE80211_DISCARD(vap, 657 IEEE80211_MSG_INPUT | 658 IEEE80211_MSG_WDS, wh, 659 "4-address data", 660 "%s", "unauthorized port"); 661 vap->iv_stats.is_rx_unauth++; 662 IEEE80211_NODE_STAT(ni, rx_unauth); 663 goto err; 664 } 665 ieee80211_dwds_discover(ni, m); 666 return type; 667 } 668 669 /* 670 * Handle A-MPDU re-ordering. If the frame is to be 671 * processed directly then ieee80211_ampdu_reorder 672 * will return 0; otherwise it has consumed the mbuf 673 * and we should do nothing more with it. 674 */ 675 if ((m->m_flags & M_AMPDU) && 676 ieee80211_ampdu_reorder(ni, m) != 0) { 677 m = NULL; 678 goto out; 679 } 680 resubmit_ampdu: 681 682 /* 683 * Handle privacy requirements. Note that we 684 * must not be preempted from here until after 685 * we (potentially) call ieee80211_crypto_demic; 686 * otherwise we may violate assumptions in the 687 * crypto cipher modules used to do delayed update 688 * of replay sequence numbers. 689 */ 690 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 691 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 692 /* 693 * Discard encrypted frames when privacy is off. 694 */ 695 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 696 wh, "WEP", "%s", "PRIVACY off"); 697 vap->iv_stats.is_rx_noprivacy++; 698 IEEE80211_NODE_STAT(ni, rx_noprivacy); 699 goto out; 700 } 701 key = ieee80211_crypto_decap(ni, m, hdrspace); 702 if (key == NULL) { 703 /* NB: stats+msgs handled in crypto_decap */ 704 IEEE80211_NODE_STAT(ni, rx_wepfail); 705 goto out; 706 } 707 wh = mtod(m, struct ieee80211_frame *); 708 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 709 } else { 710 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 711 key = NULL; 712 } 713 714 /* 715 * Save QoS bits for use below--before we strip the header. 716 */ 717 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 718 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 719 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 720 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 721 } else 722 qos = 0; 723 724 /* 725 * Next up, any fragmentation. 726 */ 727 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 728 m = ieee80211_defrag(ni, m, hdrspace); 729 if (m == NULL) { 730 /* Fragment dropped or frame not complete yet */ 731 goto out; 732 } 733 } 734 wh = NULL; /* no longer valid, catch any uses */ 735 736 /* 737 * Next strip any MSDU crypto bits. 738 */ 739 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 740 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 741 ni->ni_macaddr, "data", "%s", "demic error"); 742 vap->iv_stats.is_rx_demicfail++; 743 IEEE80211_NODE_STAT(ni, rx_demicfail); 744 goto out; 745 } 746 /* copy to listener after decrypt */ 747 if (ieee80211_radiotap_active_vap(vap)) 748 ieee80211_radiotap_rx(vap, m); 749 need_tap = 0; 750 /* 751 * Finally, strip the 802.11 header. 752 */ 753 m = ieee80211_decap(vap, m, hdrspace); 754 if (m == NULL) { 755 /* XXX mask bit to check for both */ 756 /* don't count Null data frames as errors */ 757 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 758 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 759 goto out; 760 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 761 ni->ni_macaddr, "data", "%s", "decap error"); 762 vap->iv_stats.is_rx_decap++; 763 IEEE80211_NODE_STAT(ni, rx_decap); 764 goto err; 765 } 766 eh = mtod(m, struct ether_header *); 767 if (!ieee80211_node_is_authorized(ni)) { 768 /* 769 * Deny any non-PAE frames received prior to 770 * authorization. For open/shared-key 771 * authentication the port is mark authorized 772 * after authentication completes. For 802.1x 773 * the port is not marked authorized by the 774 * authenticator until the handshake has completed. 775 */ 776 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 777 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 778 eh->ether_shost, "data", 779 "unauthorized port: ether type 0x%x len %u", 780 eh->ether_type, m->m_pkthdr.len); 781 vap->iv_stats.is_rx_unauth++; 782 IEEE80211_NODE_STAT(ni, rx_unauth); 783 goto err; 784 } 785 } else { 786 /* 787 * When denying unencrypted frames, discard 788 * any non-PAE frames received without encryption. 789 */ 790 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 791 (key == NULL && (m->m_flags & M_WEP) == 0) && 792 eh->ether_type != htons(ETHERTYPE_PAE)) { 793 /* 794 * Drop unencrypted frames. 795 */ 796 vap->iv_stats.is_rx_unencrypted++; 797 IEEE80211_NODE_STAT(ni, rx_unencrypted); 798 goto out; 799 } 800 } 801 /* XXX require HT? */ 802 if (qos & IEEE80211_QOS_AMSDU) { 803 m = ieee80211_decap_amsdu(ni, m); 804 if (m == NULL) 805 return IEEE80211_FC0_TYPE_DATA; 806 } else { 807 #ifdef IEEE80211_SUPPORT_SUPERG 808 m = ieee80211_decap_fastframe(vap, ni, m); 809 if (m == NULL) 810 return IEEE80211_FC0_TYPE_DATA; 811 #endif 812 } 813 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 814 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 815 else 816 hostap_deliver_data(vap, ni, m); 817 return IEEE80211_FC0_TYPE_DATA; 818 819 case IEEE80211_FC0_TYPE_MGT: 820 vap->iv_stats.is_rx_mgmt++; 821 IEEE80211_NODE_STAT(ni, rx_mgmt); 822 if (dir != IEEE80211_FC1_DIR_NODS) { 823 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 824 wh, "mgt", "incorrect dir 0x%x", dir); 825 vap->iv_stats.is_rx_wrongdir++; 826 goto err; 827 } 828 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 829 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 830 ni->ni_macaddr, "mgt", "too short: len %u", 831 m->m_pkthdr.len); 832 vap->iv_stats.is_rx_tooshort++; 833 goto out; 834 } 835 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 836 /* ensure return frames are unicast */ 837 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 838 wh, NULL, "source is multicast: %6D", 839 wh->i_addr2, ":"); 840 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 841 goto out; 842 } 843 #ifdef IEEE80211_DEBUG 844 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 845 ieee80211_msg_dumppkts(vap)) { 846 if_printf(ifp, "received %s from %6D rssi %d\n", 847 ieee80211_mgt_subtype_name[subtype >> 848 IEEE80211_FC0_SUBTYPE_SHIFT], 849 wh->i_addr2, ":", rssi); 850 } 851 #endif 852 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 853 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 854 /* 855 * Only shared key auth frames with a challenge 856 * should be encrypted, discard all others. 857 */ 858 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 859 wh, NULL, 860 "%s", "WEP set but not permitted"); 861 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 862 goto out; 863 } 864 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 865 /* 866 * Discard encrypted frames when privacy is off. 867 */ 868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 869 wh, NULL, "%s", "WEP set but PRIVACY off"); 870 vap->iv_stats.is_rx_noprivacy++; 871 goto out; 872 } 873 hdrspace = ieee80211_hdrspace(ic, wh); 874 key = ieee80211_crypto_decap(ni, m, hdrspace); 875 if (key == NULL) { 876 /* NB: stats+msgs handled in crypto_decap */ 877 goto out; 878 } 879 wh = mtod(m, struct ieee80211_frame *); 880 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 881 } 882 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 883 goto out; 884 885 case IEEE80211_FC0_TYPE_CTL: 886 vap->iv_stats.is_rx_ctl++; 887 IEEE80211_NODE_STAT(ni, rx_ctrl); 888 vap->iv_recv_ctl(ni, m, subtype); 889 goto out; 890 default: 891 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 892 wh, "bad", "frame type 0x%x", type); 893 /* should not come here */ 894 break; 895 } 896 err: 897 ifp->if_ierrors++; 898 out: 899 if (m != NULL) { 900 if (need_tap && ieee80211_radiotap_active_vap(vap)) 901 ieee80211_radiotap_rx(vap, m); 902 m_freem(m); 903 } 904 return type; 905 #undef SEQ_LEQ 906 } 907 908 static void 909 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 910 int rssi, int nf, uint16_t seq, uint16_t status) 911 { 912 struct ieee80211vap *vap = ni->ni_vap; 913 914 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 915 916 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 917 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 918 ni->ni_macaddr, "open auth", 919 "bad sta auth mode %u", ni->ni_authmode); 920 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 921 /* 922 * Clear any challenge text that may be there if 923 * a previous shared key auth failed and then an 924 * open auth is attempted. 925 */ 926 if (ni->ni_challenge != NULL) { 927 kfree(ni->ni_challenge, M_80211_NODE); 928 ni->ni_challenge = NULL; 929 } 930 /* XXX hack to workaround calling convention */ 931 ieee80211_send_error(ni, wh->i_addr2, 932 IEEE80211_FC0_SUBTYPE_AUTH, 933 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 934 return; 935 } 936 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 937 vap->iv_stats.is_rx_bad_auth++; 938 return; 939 } 940 /* always accept open authentication requests */ 941 if (ni == vap->iv_bss) { 942 ni = ieee80211_dup_bss(vap, wh->i_addr2); 943 if (ni == NULL) 944 return; 945 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 946 (void) ieee80211_ref_node(ni); 947 /* 948 * Mark the node as referenced to reflect that it's 949 * reference count has been bumped to insure it remains 950 * after the transaction completes. 951 */ 952 ni->ni_flags |= IEEE80211_NODE_AREF; 953 /* 954 * Mark the node as requiring a valid association id 955 * before outbound traffic is permitted. 956 */ 957 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 958 959 if (vap->iv_acl != NULL && 960 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 961 /* 962 * When the ACL policy is set to RADIUS we defer the 963 * authorization to a user agent. Dispatch an event, 964 * a subsequent MLME call will decide the fate of the 965 * station. If the user agent is not present then the 966 * node will be reclaimed due to inactivity. 967 */ 968 IEEE80211_NOTE_MAC(vap, 969 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 970 "%s", "station authentication defered (radius acl)"); 971 ieee80211_notify_node_auth(ni); 972 } else { 973 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 974 IEEE80211_NOTE_MAC(vap, 975 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 976 "%s", "station authenticated (open)"); 977 /* 978 * When 802.1x is not in use mark the port 979 * authorized at this point so traffic can flow. 980 */ 981 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 982 ieee80211_node_authorize(ni); 983 } 984 } 985 986 static void 987 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 988 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 989 uint16_t seq, uint16_t status) 990 { 991 struct ieee80211vap *vap = ni->ni_vap; 992 uint8_t *challenge; 993 int allocbs, estatus; 994 995 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 996 997 /* 998 * NB: this can happen as we allow pre-shared key 999 * authentication to be enabled w/o wep being turned 1000 * on so that configuration of these can be done 1001 * in any order. It may be better to enforce the 1002 * ordering in which case this check would just be 1003 * for sanity/consistency. 1004 */ 1005 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1006 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1007 ni->ni_macaddr, "shared key auth", 1008 "%s", " PRIVACY is disabled"); 1009 estatus = IEEE80211_STATUS_ALG; 1010 goto bad; 1011 } 1012 /* 1013 * Pre-shared key authentication is evil; accept 1014 * it only if explicitly configured (it is supported 1015 * mainly for compatibility with clients like Mac OS X). 1016 */ 1017 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1018 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1019 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1020 ni->ni_macaddr, "shared key auth", 1021 "bad sta auth mode %u", ni->ni_authmode); 1022 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1023 estatus = IEEE80211_STATUS_ALG; 1024 goto bad; 1025 } 1026 1027 challenge = NULL; 1028 if (frm + 1 < efrm) { 1029 if ((frm[1] + 2) > (efrm - frm)) { 1030 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1031 ni->ni_macaddr, "shared key auth", 1032 "ie %d/%d too long", 1033 frm[0], (int)((frm[1] + 2) - (efrm - frm))); 1034 vap->iv_stats.is_rx_bad_auth++; 1035 estatus = IEEE80211_STATUS_CHALLENGE; 1036 goto bad; 1037 } 1038 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1039 challenge = frm; 1040 frm += frm[1] + 2; 1041 } 1042 switch (seq) { 1043 case IEEE80211_AUTH_SHARED_CHALLENGE: 1044 case IEEE80211_AUTH_SHARED_RESPONSE: 1045 if (challenge == NULL) { 1046 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1047 ni->ni_macaddr, "shared key auth", 1048 "%s", "no challenge"); 1049 vap->iv_stats.is_rx_bad_auth++; 1050 estatus = IEEE80211_STATUS_CHALLENGE; 1051 goto bad; 1052 } 1053 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1054 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1055 ni->ni_macaddr, "shared key auth", 1056 "bad challenge len %d", challenge[1]); 1057 vap->iv_stats.is_rx_bad_auth++; 1058 estatus = IEEE80211_STATUS_CHALLENGE; 1059 goto bad; 1060 } 1061 default: 1062 break; 1063 } 1064 switch (seq) { 1065 case IEEE80211_AUTH_SHARED_REQUEST: 1066 if (ni == vap->iv_bss) { 1067 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1068 if (ni == NULL) { 1069 /* NB: no way to return an error */ 1070 return; 1071 } 1072 allocbs = 1; 1073 } else { 1074 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1075 (void) ieee80211_ref_node(ni); 1076 allocbs = 0; 1077 } 1078 /* 1079 * Mark the node as referenced to reflect that it's 1080 * reference count has been bumped to insure it remains 1081 * after the transaction completes. 1082 */ 1083 ni->ni_flags |= IEEE80211_NODE_AREF; 1084 /* 1085 * Mark the node as requiring a valid associatio id 1086 * before outbound traffic is permitted. 1087 */ 1088 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1089 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1090 ni->ni_noise = nf; 1091 if (!ieee80211_alloc_challenge(ni)) { 1092 /* NB: don't return error so they rexmit */ 1093 return; 1094 } 1095 get_random_bytes(ni->ni_challenge, 1096 IEEE80211_CHALLENGE_LEN); 1097 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1098 ni, "shared key %sauth request", allocbs ? "" : "re"); 1099 /* 1100 * When the ACL policy is set to RADIUS we defer the 1101 * authorization to a user agent. Dispatch an event, 1102 * a subsequent MLME call will decide the fate of the 1103 * station. If the user agent is not present then the 1104 * node will be reclaimed due to inactivity. 1105 */ 1106 if (vap->iv_acl != NULL && 1107 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1108 IEEE80211_NOTE_MAC(vap, 1109 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1110 ni->ni_macaddr, 1111 "%s", "station authentication defered (radius acl)"); 1112 ieee80211_notify_node_auth(ni); 1113 return; 1114 } 1115 break; 1116 case IEEE80211_AUTH_SHARED_RESPONSE: 1117 if (ni == vap->iv_bss) { 1118 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1119 ni->ni_macaddr, "shared key response", 1120 "%s", "unknown station"); 1121 /* NB: don't send a response */ 1122 return; 1123 } 1124 if (ni->ni_challenge == NULL) { 1125 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1126 ni->ni_macaddr, "shared key response", 1127 "%s", "no challenge recorded"); 1128 vap->iv_stats.is_rx_bad_auth++; 1129 estatus = IEEE80211_STATUS_CHALLENGE; 1130 goto bad; 1131 } 1132 if (memcmp(ni->ni_challenge, &challenge[2], 1133 challenge[1]) != 0) { 1134 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1135 ni->ni_macaddr, "shared key response", 1136 "%s", "challenge mismatch"); 1137 vap->iv_stats.is_rx_auth_fail++; 1138 estatus = IEEE80211_STATUS_CHALLENGE; 1139 goto bad; 1140 } 1141 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1142 ni, "%s", "station authenticated (shared key)"); 1143 ieee80211_node_authorize(ni); 1144 break; 1145 default: 1146 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1147 ni->ni_macaddr, "shared key auth", 1148 "bad seq %d", seq); 1149 vap->iv_stats.is_rx_bad_auth++; 1150 estatus = IEEE80211_STATUS_SEQUENCE; 1151 goto bad; 1152 } 1153 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1154 return; 1155 bad: 1156 /* 1157 * Send an error response; but only when operating as an AP. 1158 */ 1159 /* XXX hack to workaround calling convention */ 1160 ieee80211_send_error(ni, wh->i_addr2, 1161 IEEE80211_FC0_SUBTYPE_AUTH, 1162 (seq + 1) | (estatus<<16)); 1163 } 1164 1165 /* 1166 * Convert a WPA cipher selector OUI to an internal 1167 * cipher algorithm. Where appropriate we also 1168 * record any key length. 1169 */ 1170 static int 1171 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1172 { 1173 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1174 uint32_t w = LE_READ_4(sel); 1175 1176 switch (w) { 1177 case WPA_SEL(WPA_CSE_NULL): 1178 return IEEE80211_CIPHER_NONE; 1179 case WPA_SEL(WPA_CSE_WEP40): 1180 if (keylen) 1181 *keylen = 40 / NBBY; 1182 return IEEE80211_CIPHER_WEP; 1183 case WPA_SEL(WPA_CSE_WEP104): 1184 if (keylen) 1185 *keylen = 104 / NBBY; 1186 return IEEE80211_CIPHER_WEP; 1187 case WPA_SEL(WPA_CSE_TKIP): 1188 return IEEE80211_CIPHER_TKIP; 1189 case WPA_SEL(WPA_CSE_CCMP): 1190 return IEEE80211_CIPHER_AES_CCM; 1191 } 1192 return 32; /* NB: so 1<< is discarded */ 1193 #undef WPA_SEL 1194 } 1195 1196 /* 1197 * Convert a WPA key management/authentication algorithm 1198 * to an internal code. 1199 */ 1200 static int 1201 wpa_keymgmt(const uint8_t *sel) 1202 { 1203 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1204 uint32_t w = LE_READ_4(sel); 1205 1206 switch (w) { 1207 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1208 return WPA_ASE_8021X_UNSPEC; 1209 case WPA_SEL(WPA_ASE_8021X_PSK): 1210 return WPA_ASE_8021X_PSK; 1211 case WPA_SEL(WPA_ASE_NONE): 1212 return WPA_ASE_NONE; 1213 } 1214 return 0; /* NB: so is discarded */ 1215 #undef WPA_SEL 1216 } 1217 1218 /* 1219 * Parse a WPA information element to collect parameters. 1220 * Note that we do not validate security parameters; that 1221 * is handled by the authenticator; the parsing done here 1222 * is just for internal use in making operational decisions. 1223 */ 1224 static int 1225 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1226 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1227 { 1228 uint8_t len = frm[1]; 1229 uint32_t w; 1230 int n; 1231 1232 /* 1233 * Check the length once for fixed parts: OUI, type, 1234 * version, mcast cipher, and 2 selector counts. 1235 * Other, variable-length data, must be checked separately. 1236 */ 1237 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1238 IEEE80211_DISCARD_IE(vap, 1239 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1240 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1241 return IEEE80211_REASON_IE_INVALID; 1242 } 1243 if (len < 14) { 1244 IEEE80211_DISCARD_IE(vap, 1245 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1246 wh, "WPA", "too short, len %u", len); 1247 return IEEE80211_REASON_IE_INVALID; 1248 } 1249 frm += 6, len -= 4; /* NB: len is payload only */ 1250 /* NB: iswpaoui already validated the OUI and type */ 1251 w = LE_READ_2(frm); 1252 if (w != WPA_VERSION) { 1253 IEEE80211_DISCARD_IE(vap, 1254 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1255 wh, "WPA", "bad version %u", w); 1256 return IEEE80211_REASON_IE_INVALID; 1257 } 1258 frm += 2, len -= 2; 1259 1260 memset(rsn, 0, sizeof(*rsn)); 1261 1262 /* multicast/group cipher */ 1263 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1264 frm += 4, len -= 4; 1265 1266 /* unicast ciphers */ 1267 n = LE_READ_2(frm); 1268 frm += 2, len -= 2; 1269 if (len < n*4+2) { 1270 IEEE80211_DISCARD_IE(vap, 1271 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1272 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1273 len, n); 1274 return IEEE80211_REASON_IE_INVALID; 1275 } 1276 w = 0; 1277 for (; n > 0; n--) { 1278 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1279 frm += 4, len -= 4; 1280 } 1281 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1282 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1283 else 1284 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1285 1286 /* key management algorithms */ 1287 n = LE_READ_2(frm); 1288 frm += 2, len -= 2; 1289 if (len < n*4) { 1290 IEEE80211_DISCARD_IE(vap, 1291 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1292 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1293 len, n); 1294 return IEEE80211_REASON_IE_INVALID; 1295 } 1296 w = 0; 1297 for (; n > 0; n--) { 1298 w |= wpa_keymgmt(frm); 1299 frm += 4, len -= 4; 1300 } 1301 if (w & WPA_ASE_8021X_UNSPEC) 1302 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1303 else 1304 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1305 1306 if (len > 2) /* optional capabilities */ 1307 rsn->rsn_caps = LE_READ_2(frm); 1308 1309 return 0; 1310 } 1311 1312 /* 1313 * Convert an RSN cipher selector OUI to an internal 1314 * cipher algorithm. Where appropriate we also 1315 * record any key length. 1316 */ 1317 static int 1318 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1319 { 1320 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1321 uint32_t w = LE_READ_4(sel); 1322 1323 switch (w) { 1324 case RSN_SEL(RSN_CSE_NULL): 1325 return IEEE80211_CIPHER_NONE; 1326 case RSN_SEL(RSN_CSE_WEP40): 1327 if (keylen) 1328 *keylen = 40 / NBBY; 1329 return IEEE80211_CIPHER_WEP; 1330 case RSN_SEL(RSN_CSE_WEP104): 1331 if (keylen) 1332 *keylen = 104 / NBBY; 1333 return IEEE80211_CIPHER_WEP; 1334 case RSN_SEL(RSN_CSE_TKIP): 1335 return IEEE80211_CIPHER_TKIP; 1336 case RSN_SEL(RSN_CSE_CCMP): 1337 return IEEE80211_CIPHER_AES_CCM; 1338 case RSN_SEL(RSN_CSE_WRAP): 1339 return IEEE80211_CIPHER_AES_OCB; 1340 } 1341 return 32; /* NB: so 1<< is discarded */ 1342 #undef WPA_SEL 1343 } 1344 1345 /* 1346 * Convert an RSN key management/authentication algorithm 1347 * to an internal code. 1348 */ 1349 static int 1350 rsn_keymgmt(const uint8_t *sel) 1351 { 1352 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1353 uint32_t w = LE_READ_4(sel); 1354 1355 switch (w) { 1356 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1357 return RSN_ASE_8021X_UNSPEC; 1358 case RSN_SEL(RSN_ASE_8021X_PSK): 1359 return RSN_ASE_8021X_PSK; 1360 case RSN_SEL(RSN_ASE_NONE): 1361 return RSN_ASE_NONE; 1362 } 1363 return 0; /* NB: so is discarded */ 1364 #undef RSN_SEL 1365 } 1366 1367 /* 1368 * Parse a WPA/RSN information element to collect parameters 1369 * and validate the parameters against what has been 1370 * configured for the system. 1371 */ 1372 static int 1373 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1374 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1375 { 1376 uint8_t len = frm[1]; 1377 uint32_t w; 1378 int n; 1379 1380 /* 1381 * Check the length once for fixed parts: 1382 * version, mcast cipher, and 2 selector counts. 1383 * Other, variable-length data, must be checked separately. 1384 */ 1385 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1386 IEEE80211_DISCARD_IE(vap, 1387 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1388 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1389 return IEEE80211_REASON_IE_INVALID; 1390 } 1391 if (len < 10) { 1392 IEEE80211_DISCARD_IE(vap, 1393 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1394 wh, "RSN", "too short, len %u", len); 1395 return IEEE80211_REASON_IE_INVALID; 1396 } 1397 frm += 2; 1398 w = LE_READ_2(frm); 1399 if (w != RSN_VERSION) { 1400 IEEE80211_DISCARD_IE(vap, 1401 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1402 wh, "RSN", "bad version %u", w); 1403 return IEEE80211_REASON_IE_INVALID; 1404 } 1405 frm += 2, len -= 2; 1406 1407 memset(rsn, 0, sizeof(*rsn)); 1408 1409 /* multicast/group cipher */ 1410 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1411 frm += 4, len -= 4; 1412 1413 /* unicast ciphers */ 1414 n = LE_READ_2(frm); 1415 frm += 2, len -= 2; 1416 if (len < n*4+2) { 1417 IEEE80211_DISCARD_IE(vap, 1418 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1419 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1420 len, n); 1421 return IEEE80211_REASON_IE_INVALID; 1422 } 1423 w = 0; 1424 for (; n > 0; n--) { 1425 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1426 frm += 4, len -= 4; 1427 } 1428 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1429 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1430 else 1431 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1432 1433 /* key management algorithms */ 1434 n = LE_READ_2(frm); 1435 frm += 2, len -= 2; 1436 if (len < n*4) { 1437 IEEE80211_DISCARD_IE(vap, 1438 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1439 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1440 len, n); 1441 return IEEE80211_REASON_IE_INVALID; 1442 } 1443 w = 0; 1444 for (; n > 0; n--) { 1445 w |= rsn_keymgmt(frm); 1446 frm += 4, len -= 4; 1447 } 1448 if (w & RSN_ASE_8021X_UNSPEC) 1449 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1450 else 1451 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1452 1453 /* optional RSN capabilities */ 1454 if (len > 2) 1455 rsn->rsn_caps = LE_READ_2(frm); 1456 /* XXXPMKID */ 1457 1458 return 0; 1459 } 1460 1461 /* 1462 * WPA/802.11i assocation request processing. 1463 */ 1464 static int 1465 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1466 const struct ieee80211_frame *wh, const uint8_t *wpa, 1467 const uint8_t *rsn, uint16_t capinfo) 1468 { 1469 struct ieee80211vap *vap = ni->ni_vap; 1470 uint8_t reason; 1471 int badwparsn; 1472 1473 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1474 if (wpa == NULL && rsn == NULL) { 1475 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1476 /* 1477 * W-Fi Protected Setup (WPS) permits 1478 * clients to associate and pass EAPOL frames 1479 * to establish initial credentials. 1480 */ 1481 ni->ni_flags |= IEEE80211_NODE_WPS; 1482 return 1; 1483 } 1484 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1485 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1486 /* 1487 * Transitional Security Network. Permits clients 1488 * to associate and use WEP while WPA is configured. 1489 */ 1490 ni->ni_flags |= IEEE80211_NODE_TSN; 1491 return 1; 1492 } 1493 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1494 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1495 vap->iv_stats.is_rx_assoc_badwpaie++; 1496 reason = IEEE80211_REASON_IE_INVALID; 1497 goto bad; 1498 } 1499 /* assert right association security credentials */ 1500 badwparsn = 0; /* NB: to silence compiler */ 1501 switch (vap->iv_flags & IEEE80211_F_WPA) { 1502 case IEEE80211_F_WPA1: 1503 badwparsn = (wpa == NULL); 1504 break; 1505 case IEEE80211_F_WPA2: 1506 badwparsn = (rsn == NULL); 1507 break; 1508 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1509 badwparsn = (wpa == NULL && rsn == NULL); 1510 break; 1511 } 1512 if (badwparsn) { 1513 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1514 wh, NULL, 1515 "%s", "missing WPA/RSN IE in association request"); 1516 vap->iv_stats.is_rx_assoc_badwpaie++; 1517 reason = IEEE80211_REASON_IE_INVALID; 1518 goto bad; 1519 } 1520 /* 1521 * Parse WPA/RSN information element. 1522 */ 1523 if (wpa != NULL) 1524 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1525 else 1526 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1527 if (reason != 0) { 1528 /* XXX distinguish WPA/RSN? */ 1529 vap->iv_stats.is_rx_assoc_badwpaie++; 1530 goto bad; 1531 } 1532 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1533 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1534 wpa != NULL ? "WPA" : "RSN", 1535 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1536 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1537 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1538 1539 return 1; 1540 bad: 1541 ieee80211_node_deauth(ni, reason); 1542 return 0; 1543 } 1544 1545 /* XXX find a better place for definition */ 1546 struct l2_update_frame { 1547 struct ether_header eh; 1548 uint8_t dsap; 1549 uint8_t ssap; 1550 uint8_t control; 1551 uint8_t xid[3]; 1552 } __packed; 1553 1554 /* 1555 * Deliver a TGf L2UF frame on behalf of a station. 1556 * This primes any bridge when the station is roaming 1557 * between ap's on the same wired network. 1558 */ 1559 static void 1560 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1561 { 1562 struct ieee80211vap *vap = ni->ni_vap; 1563 struct ifnet *ifp = vap->iv_ifp; 1564 struct mbuf *m; 1565 struct l2_update_frame *l2uf; 1566 struct ether_header *eh; 1567 1568 m = m_gethdr(MB_DONTWAIT, MT_DATA); 1569 if (m == NULL) { 1570 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1571 "%s", "no mbuf for l2uf frame"); 1572 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1573 return; 1574 } 1575 l2uf = mtod(m, struct l2_update_frame *); 1576 eh = &l2uf->eh; 1577 /* dst: Broadcast address */ 1578 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1579 /* src: associated STA */ 1580 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1581 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1582 1583 l2uf->dsap = 0; 1584 l2uf->ssap = 0; 1585 l2uf->control = 0xf5; 1586 l2uf->xid[0] = 0x81; 1587 l2uf->xid[1] = 0x80; 1588 l2uf->xid[2] = 0x00; 1589 1590 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1591 hostap_deliver_data(vap, ni, m); 1592 } 1593 1594 static void 1595 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1596 int reassoc, int resp, const char *tag, int rate) 1597 { 1598 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1599 "deny %s request, %s rate set mismatch, rate/MCS %d", 1600 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1601 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1602 ieee80211_node_leave(ni); 1603 } 1604 1605 static void 1606 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1607 int reassoc, int resp, const char *tag, int capinfo) 1608 { 1609 struct ieee80211vap *vap = ni->ni_vap; 1610 1611 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1612 "deny %s request, %s mismatch 0x%x", 1613 reassoc ? "reassoc" : "assoc", tag, capinfo); 1614 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1615 ieee80211_node_leave(ni); 1616 vap->iv_stats.is_rx_assoc_capmismatch++; 1617 } 1618 1619 static void 1620 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1621 int reassoc, int resp) 1622 { 1623 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1624 "deny %s request, missing HT ie", reassoc ? "reassoc" : "assoc"); 1625 /* XXX no better code */ 1626 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1627 ieee80211_node_leave(ni); 1628 } 1629 1630 static void 1631 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1632 int algo, int seq, int status) 1633 { 1634 struct ieee80211vap *vap = ni->ni_vap; 1635 1636 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1637 wh, NULL, "unsupported alg %d", algo); 1638 vap->iv_stats.is_rx_auth_unsupported++; 1639 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1640 seq | (status << 16)); 1641 } 1642 1643 static __inline int 1644 ishtmixed(const uint8_t *ie) 1645 { 1646 const struct ieee80211_ie_htinfo *ht = 1647 (const struct ieee80211_ie_htinfo *) ie; 1648 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1649 IEEE80211_HTINFO_OPMODE_MIXED; 1650 } 1651 1652 static int 1653 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1654 { 1655 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1656 int i; 1657 1658 /* NB: the 11b clients we care about will not have xrates */ 1659 if (xrates != NULL || rates == NULL) 1660 return 0; 1661 for (i = 0; i < rates[1]; i++) { 1662 int r = rates[2+i] & IEEE80211_RATE_VAL; 1663 if (r > 2*11 || ((1<<r) & brates) == 0) 1664 return 0; 1665 } 1666 return 1; 1667 } 1668 1669 static void 1670 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1671 int subtype, int rssi, int nf) 1672 { 1673 struct ieee80211vap *vap = ni->ni_vap; 1674 struct ieee80211com *ic = ni->ni_ic; 1675 struct ieee80211_frame *wh; 1676 uint8_t *frm, *efrm, *sfrm; 1677 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1678 int reassoc, resp; 1679 uint8_t rate; 1680 1681 wh = mtod(m0, struct ieee80211_frame *); 1682 frm = (uint8_t *)&wh[1]; 1683 efrm = mtod(m0, uint8_t *) + m0->m_len; 1684 switch (subtype) { 1685 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1686 case IEEE80211_FC0_SUBTYPE_BEACON: { 1687 struct ieee80211_scanparams scan; 1688 /* 1689 * We process beacon/probe response frames when scanning; 1690 * otherwise we check beacon frames for overlapping non-ERP 1691 * BSS in 11g and/or overlapping legacy BSS when in HT. 1692 */ 1693 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1694 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1695 vap->iv_stats.is_rx_mgtdiscard++; 1696 return; 1697 } 1698 /* NB: accept off-channel frames */ 1699 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1700 return; 1701 /* 1702 * Count frame now that we know it's to be processed. 1703 */ 1704 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1705 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1706 IEEE80211_NODE_STAT(ni, rx_beacons); 1707 } else 1708 IEEE80211_NODE_STAT(ni, rx_proberesp); 1709 /* 1710 * If scanning, just pass information to the scan module. 1711 */ 1712 if (ic->ic_flags & IEEE80211_F_SCAN) { 1713 if (scan.status == 0 && /* NB: on channel */ 1714 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1715 /* 1716 * Actively scanning a channel marked passive; 1717 * send a probe request now that we know there 1718 * is 802.11 traffic present. 1719 * 1720 * XXX check if the beacon we recv'd gives 1721 * us what we need and suppress the probe req 1722 */ 1723 ieee80211_probe_curchan(vap, 1); 1724 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1725 } 1726 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1727 return; 1728 } 1729 /* 1730 * Check beacon for overlapping bss w/ non ERP stations. 1731 * If we detect one and protection is configured but not 1732 * enabled, enable it and start a timer that'll bring us 1733 * out if we stop seeing the bss. 1734 */ 1735 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1736 scan.status == 0 && /* NB: on-channel */ 1737 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1738 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1739 ic->ic_lastnonerp = ticks; 1740 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1741 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1742 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1743 IEEE80211_NOTE_FRAME(vap, 1744 IEEE80211_MSG_ASSOC, wh, 1745 "non-ERP present on channel %d " 1746 "(saw erp 0x%x from channel %d), " 1747 "enable use of protection", 1748 ic->ic_curchan->ic_ieee, 1749 scan.erp, scan.chan); 1750 ic->ic_flags |= IEEE80211_F_USEPROT; 1751 ieee80211_notify_erp(ic); 1752 } 1753 } 1754 /* 1755 * Check beacon for non-HT station on HT channel 1756 * and update HT BSS occupancy as appropriate. 1757 */ 1758 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1759 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1760 /* 1761 * Off control channel; only check frames 1762 * that come in the extension channel when 1763 * operating w/ HT40. 1764 */ 1765 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1766 break; 1767 if (scan.chan != ic->ic_curchan->ic_extieee) 1768 break; 1769 } 1770 if (scan.htinfo == NULL) { 1771 ieee80211_htprot_update(ic, 1772 IEEE80211_HTINFO_OPMODE_PROTOPT | 1773 IEEE80211_HTINFO_NONHT_PRESENT); 1774 } else if (ishtmixed(scan.htinfo)) { 1775 /* XXX? take NONHT_PRESENT from beacon? */ 1776 ieee80211_htprot_update(ic, 1777 IEEE80211_HTINFO_OPMODE_MIXED | 1778 IEEE80211_HTINFO_NONHT_PRESENT); 1779 } 1780 } 1781 break; 1782 } 1783 1784 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1785 if (vap->iv_state != IEEE80211_S_RUN) { 1786 vap->iv_stats.is_rx_mgtdiscard++; 1787 return; 1788 } 1789 /* 1790 * prreq frame format 1791 * [tlv] ssid 1792 * [tlv] supported rates 1793 * [tlv] extended supported rates 1794 */ 1795 ssid = rates = xrates = NULL; 1796 sfrm = frm; 1797 while (efrm - frm > 1) { 1798 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1799 switch (*frm) { 1800 case IEEE80211_ELEMID_SSID: 1801 ssid = frm; 1802 break; 1803 case IEEE80211_ELEMID_RATES: 1804 rates = frm; 1805 break; 1806 case IEEE80211_ELEMID_XRATES: 1807 xrates = frm; 1808 break; 1809 } 1810 frm += frm[1] + 2; 1811 } 1812 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1813 if (xrates != NULL) 1814 IEEE80211_VERIFY_ELEMENT(xrates, 1815 IEEE80211_RATE_MAXSIZE - rates[1], return); 1816 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1817 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1818 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1819 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1820 wh, NULL, 1821 "%s", "no ssid with ssid suppression enabled"); 1822 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1823 return; 1824 } 1825 1826 /* XXX find a better class or define it's own */ 1827 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1828 "%s", "recv probe req"); 1829 /* 1830 * Some legacy 11b clients cannot hack a complete 1831 * probe response frame. When the request includes 1832 * only a bare-bones rate set, communicate this to 1833 * the transmit side. 1834 */ 1835 ieee80211_send_proberesp(vap, wh->i_addr2, 1836 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1837 break; 1838 1839 case IEEE80211_FC0_SUBTYPE_AUTH: { 1840 uint16_t algo, seq, status; 1841 1842 if (vap->iv_state != IEEE80211_S_RUN) { 1843 vap->iv_stats.is_rx_mgtdiscard++; 1844 return; 1845 } 1846 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1847 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1848 wh, NULL, "%s", "wrong bssid"); 1849 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1850 return; 1851 } 1852 /* 1853 * auth frame format 1854 * [2] algorithm 1855 * [2] sequence 1856 * [2] status 1857 * [tlv*] challenge 1858 */ 1859 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1860 algo = le16toh(*(uint16_t *)frm); 1861 seq = le16toh(*(uint16_t *)(frm + 2)); 1862 status = le16toh(*(uint16_t *)(frm + 4)); 1863 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1864 "recv auth frame with algorithm %d seq %d", algo, seq); 1865 /* 1866 * Consult the ACL policy module if setup. 1867 */ 1868 if (vap->iv_acl != NULL && 1869 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1870 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1871 wh, NULL, "%s", "disallowed by ACL"); 1872 vap->iv_stats.is_rx_acl++; 1873 ieee80211_send_error(ni, wh->i_addr2, 1874 IEEE80211_FC0_SUBTYPE_AUTH, 1875 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1876 return; 1877 } 1878 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1879 IEEE80211_DISCARD(vap, 1880 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1881 wh, NULL, "%s", "TKIP countermeasures enabled"); 1882 vap->iv_stats.is_rx_auth_countermeasures++; 1883 ieee80211_send_error(ni, wh->i_addr2, 1884 IEEE80211_FC0_SUBTYPE_AUTH, 1885 IEEE80211_REASON_MIC_FAILURE); 1886 return; 1887 } 1888 if (algo == IEEE80211_AUTH_ALG_SHARED) 1889 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1890 seq, status); 1891 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1892 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1893 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1894 authalgreject(ni, wh, algo, 1895 seq+1, IEEE80211_STATUS_ALG); 1896 return; 1897 } else { 1898 /* 1899 * We assume that an unknown algorithm is the result 1900 * of a decryption failure on a shared key auth frame; 1901 * return a status code appropriate for that instead 1902 * of IEEE80211_STATUS_ALG. 1903 * 1904 * NB: a seq# of 4 is intentional; the decrypted 1905 * frame likely has a bogus seq value. 1906 */ 1907 authalgreject(ni, wh, algo, 1908 4, IEEE80211_STATUS_CHALLENGE); 1909 return; 1910 } 1911 break; 1912 } 1913 1914 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1915 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1916 uint16_t capinfo, lintval; 1917 struct ieee80211_rsnparms rsnparms; 1918 1919 if (vap->iv_state != IEEE80211_S_RUN) { 1920 vap->iv_stats.is_rx_mgtdiscard++; 1921 return; 1922 } 1923 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1924 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1925 wh, NULL, "%s", "wrong bssid"); 1926 vap->iv_stats.is_rx_assoc_bss++; 1927 return; 1928 } 1929 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1930 reassoc = 1; 1931 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1932 } else { 1933 reassoc = 0; 1934 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1935 } 1936 if (ni == vap->iv_bss) { 1937 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1938 "deny %s request, sta not authenticated", 1939 reassoc ? "reassoc" : "assoc"); 1940 ieee80211_send_error(ni, wh->i_addr2, 1941 IEEE80211_FC0_SUBTYPE_DEAUTH, 1942 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1943 vap->iv_stats.is_rx_assoc_notauth++; 1944 return; 1945 } 1946 1947 /* 1948 * asreq frame format 1949 * [2] capability information 1950 * [2] listen interval 1951 * [6*] current AP address (reassoc only) 1952 * [tlv] ssid 1953 * [tlv] supported rates 1954 * [tlv] extended supported rates 1955 * [tlv] WPA or RSN 1956 * [tlv] HT capabilities 1957 * [tlv] Atheros capabilities 1958 */ 1959 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1960 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1961 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1962 if (reassoc) 1963 frm += 6; /* ignore current AP info */ 1964 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1965 sfrm = frm; 1966 while (efrm - frm > 1) { 1967 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1968 switch (*frm) { 1969 case IEEE80211_ELEMID_SSID: 1970 ssid = frm; 1971 break; 1972 case IEEE80211_ELEMID_RATES: 1973 rates = frm; 1974 break; 1975 case IEEE80211_ELEMID_XRATES: 1976 xrates = frm; 1977 break; 1978 case IEEE80211_ELEMID_RSN: 1979 rsn = frm; 1980 break; 1981 case IEEE80211_ELEMID_HTCAP: 1982 htcap = frm; 1983 break; 1984 case IEEE80211_ELEMID_VENDOR: 1985 if (iswpaoui(frm)) 1986 wpa = frm; 1987 else if (iswmeinfo(frm)) 1988 wme = frm; 1989 #ifdef IEEE80211_SUPPORT_SUPERG 1990 else if (isatherosoui(frm)) 1991 ath = frm; 1992 #endif 1993 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1994 if (ishtcapoui(frm) && htcap == NULL) 1995 htcap = frm; 1996 } 1997 break; 1998 } 1999 frm += frm[1] + 2; 2000 } 2001 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2002 if (xrates != NULL) 2003 IEEE80211_VERIFY_ELEMENT(xrates, 2004 IEEE80211_RATE_MAXSIZE - rates[1], return); 2005 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2006 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2007 if (htcap != NULL) { 2008 IEEE80211_VERIFY_LENGTH(htcap[1], 2009 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2010 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2011 sizeof(struct ieee80211_ie_htcap)-2, 2012 return); /* XXX just NULL out? */ 2013 } 2014 2015 if ((vap->iv_flags & IEEE80211_F_WPA) && 2016 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2017 return; 2018 /* discard challenge after association */ 2019 if (ni->ni_challenge != NULL) { 2020 kfree(ni->ni_challenge, M_80211_NODE); 2021 ni->ni_challenge = NULL; 2022 } 2023 /* NB: 802.11 spec says to ignore station's privacy bit */ 2024 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2025 capinfomismatch(ni, wh, reassoc, resp, 2026 "capability", capinfo); 2027 return; 2028 } 2029 /* 2030 * Disallow re-associate w/ invalid slot time setting. 2031 */ 2032 if (ni->ni_associd != 0 && 2033 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2034 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2035 capinfomismatch(ni, wh, reassoc, resp, 2036 "slot time", capinfo); 2037 return; 2038 } 2039 rate = ieee80211_setup_rates(ni, rates, xrates, 2040 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2041 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2042 if (rate & IEEE80211_RATE_BASIC) { 2043 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2044 vap->iv_stats.is_rx_assoc_norate++; 2045 return; 2046 } 2047 /* 2048 * If constrained to 11g-only stations reject an 2049 * 11b-only station. We cheat a bit here by looking 2050 * at the max negotiated xmit rate and assuming anyone 2051 * with a best rate <24Mb/s is an 11b station. 2052 */ 2053 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2054 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2055 vap->iv_stats.is_rx_assoc_norate++; 2056 return; 2057 } 2058 /* 2059 * Do HT rate set handling and setup HT node state. 2060 */ 2061 ni->ni_chan = vap->iv_bss->ni_chan; 2062 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2063 rate = ieee80211_setup_htrates(ni, htcap, 2064 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2065 IEEE80211_F_DOBRS); 2066 if (rate & IEEE80211_RATE_BASIC) { 2067 ratesetmismatch(ni, wh, reassoc, resp, 2068 "HT", rate); 2069 vap->iv_stats.is_ht_assoc_norate++; 2070 return; 2071 } 2072 ieee80211_ht_node_init(ni); 2073 ieee80211_ht_updatehtcap(ni, htcap); 2074 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2075 ieee80211_ht_node_cleanup(ni); 2076 #ifdef IEEE80211_SUPPORT_SUPERG 2077 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2078 ieee80211_ff_node_cleanup(ni); 2079 #endif 2080 /* 2081 * Allow AMPDU operation only with unencrypted traffic 2082 * or AES-CCM; the 11n spec only specifies these ciphers 2083 * so permitting any others is undefined and can lead 2084 * to interoperability problems. 2085 */ 2086 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2087 (((vap->iv_flags & IEEE80211_F_WPA) && 2088 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2089 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2090 IEEE80211_NOTE(vap, 2091 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2092 "disallow HT use because WEP or TKIP requested, " 2093 "capinfo 0x%x ucastcipher %d", capinfo, 2094 rsnparms.rsn_ucastcipher); 2095 ieee80211_ht_node_cleanup(ni); 2096 vap->iv_stats.is_ht_assoc_downgrade++; 2097 } 2098 /* 2099 * If constrained to 11n-only stations reject legacy stations. 2100 */ 2101 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2102 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2103 htcapmismatch(ni, wh, reassoc, resp); 2104 vap->iv_stats.is_ht_assoc_nohtcap++; 2105 return; 2106 } 2107 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2108 ni->ni_noise = nf; 2109 ni->ni_intval = lintval; 2110 ni->ni_capinfo = capinfo; 2111 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2112 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2113 /* 2114 * Store the IEs. 2115 * XXX maybe better to just expand 2116 */ 2117 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2118 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2119 if (wpa != NULL) 2120 setie(wpa_ie, wpa - sfrm); 2121 if (rsn != NULL) 2122 setie(rsn_ie, rsn - sfrm); 2123 if (htcap != NULL) 2124 setie(htcap_ie, htcap - sfrm); 2125 if (wme != NULL) { 2126 setie(wme_ie, wme - sfrm); 2127 /* 2128 * Mark node as capable of QoS. 2129 */ 2130 ni->ni_flags |= IEEE80211_NODE_QOS; 2131 } else 2132 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2133 #ifdef IEEE80211_SUPPORT_SUPERG 2134 if (ath != NULL) { 2135 setie(ath_ie, ath - sfrm); 2136 /* 2137 * Parse ATH station parameters. 2138 */ 2139 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2140 } else 2141 #endif 2142 ni->ni_ath_flags = 0; 2143 #undef setie 2144 } else { 2145 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2146 ni->ni_ath_flags = 0; 2147 } 2148 ieee80211_node_join(ni, resp); 2149 ieee80211_deliver_l2uf(ni); 2150 break; 2151 } 2152 2153 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2154 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2155 uint16_t reason; 2156 2157 if (vap->iv_state != IEEE80211_S_RUN || 2158 /* NB: can happen when in promiscuous mode */ 2159 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2160 vap->iv_stats.is_rx_mgtdiscard++; 2161 break; 2162 } 2163 /* 2164 * deauth/disassoc frame format 2165 * [2] reason 2166 */ 2167 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2168 reason = le16toh(*(uint16_t *)frm); 2169 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2170 vap->iv_stats.is_rx_deauth++; 2171 IEEE80211_NODE_STAT(ni, rx_deauth); 2172 } else { 2173 vap->iv_stats.is_rx_disassoc++; 2174 IEEE80211_NODE_STAT(ni, rx_disassoc); 2175 } 2176 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2177 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2178 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2179 if (ni != vap->iv_bss) 2180 ieee80211_node_leave(ni); 2181 break; 2182 } 2183 2184 case IEEE80211_FC0_SUBTYPE_ACTION: 2185 if (vap->iv_state == IEEE80211_S_RUN) { 2186 if (ieee80211_parse_action(ni, m0) == 0) 2187 ic->ic_recv_action(ni, wh, frm, efrm); 2188 } else 2189 vap->iv_stats.is_rx_mgtdiscard++; 2190 break; 2191 2192 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2193 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2194 default: 2195 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2196 wh, "mgt", "subtype 0x%x not handled", subtype); 2197 vap->iv_stats.is_rx_badsubtype++; 2198 break; 2199 } 2200 } 2201 2202 static void 2203 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2204 { 2205 switch (subtype) { 2206 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2207 hostap_recv_pspoll(ni, m); 2208 break; 2209 case IEEE80211_FC0_SUBTYPE_BAR: 2210 ieee80211_recv_bar(ni, m); 2211 break; 2212 } 2213 } 2214 2215 /* 2216 * Process a received ps-poll frame. 2217 */ 2218 static void 2219 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2220 { 2221 struct ieee80211vap *vap = ni->ni_vap; 2222 struct ieee80211_frame_min *wh; 2223 struct ifnet *ifp; 2224 struct mbuf *m; 2225 uint16_t aid; 2226 int qlen; 2227 2228 wh = mtod(m0, struct ieee80211_frame_min *); 2229 if (ni->ni_associd == 0) { 2230 IEEE80211_DISCARD(vap, 2231 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2232 (struct ieee80211_frame *) wh, NULL, 2233 "%s", "unassociated station"); 2234 vap->iv_stats.is_ps_unassoc++; 2235 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2236 IEEE80211_REASON_NOT_ASSOCED); 2237 return; 2238 } 2239 2240 aid = le16toh(*(uint16_t *)wh->i_dur); 2241 if (aid != ni->ni_associd) { 2242 IEEE80211_DISCARD(vap, 2243 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2244 (struct ieee80211_frame *) wh, NULL, 2245 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2246 ni->ni_associd, aid); 2247 vap->iv_stats.is_ps_badaid++; 2248 /* 2249 * NB: We used to deauth the station but it turns out 2250 * the Blackberry Curve 8230 (and perhaps other devices) 2251 * sometimes send the wrong AID when WME is negotiated. 2252 * Being more lenient here seems ok as we already check 2253 * the station is associated and we only return frames 2254 * queued for the station (i.e. we don't use the AID). 2255 */ 2256 return; 2257 } 2258 2259 /* Okay, take the first queued packet and put it out... */ 2260 m = ieee80211_node_psq_dequeue(ni, &qlen); 2261 if (m == NULL) { 2262 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2263 "%s", "recv ps-poll, but queue empty"); 2264 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2265 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2266 if (vap->iv_set_tim != NULL) 2267 vap->iv_set_tim(ni, 0); /* just in case */ 2268 return; 2269 } 2270 /* 2271 * If there are more packets, set the more packets bit 2272 * in the packet dispatched to the station; otherwise 2273 * turn off the TIM bit. 2274 */ 2275 if (qlen != 0) { 2276 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2277 "recv ps-poll, send packet, %u still queued", qlen); 2278 m->m_flags |= M_MORE_DATA; 2279 } else { 2280 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2281 "%s", "recv ps-poll, send packet, queue empty"); 2282 if (vap->iv_set_tim != NULL) 2283 vap->iv_set_tim(ni, 0); 2284 } 2285 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2286 2287 if (m->m_flags & M_ENCAP) 2288 ifp = vap->iv_ic->ic_ifp; 2289 else 2290 ifp = vap->iv_ifp; 2291 IF_ENQUEUE(&ifp->if_snd, m); 2292 ifp->if_start(ifp); 2293 } 2294