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 * $DragonFly$ 27 */ 28 29 /* 30 * IEEE 802.11 HOSTAP mode support. 31 */ 32 #include "opt_inet.h" 33 #include "opt_wlan.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/kernel.h> 40 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/endian.h> 44 #include <sys/errno.h> 45 #include <sys/proc.h> 46 #include <sys/sysctl.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 #include <net/route.h> 53 54 #include <net/bpf.h> 55 56 #include <netproto/802_11/ieee80211_var.h> 57 #include <netproto/802_11/ieee80211_hostap.h> 58 #include <netproto/802_11/ieee80211_input.h> 59 #ifdef IEEE80211_SUPPORT_SUPERG 60 #include <netproto/802_11/ieee80211_superg.h> 61 #endif 62 #include <netproto/802_11/ieee80211_wds.h> 63 64 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 65 66 static void hostap_vattach(struct ieee80211vap *); 67 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 68 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 69 int rssi, int nf); 70 static void hostap_deliver_data(struct ieee80211vap *, 71 struct ieee80211_node *, struct mbuf *); 72 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 73 int subtype, int rssi, int nf); 74 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 75 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *); 76 77 void 78 ieee80211_hostap_attach(struct ieee80211com *ic) 79 { 80 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 81 } 82 83 void 84 ieee80211_hostap_detach(struct ieee80211com *ic) 85 { 86 } 87 88 static void 89 hostap_vdetach(struct ieee80211vap *vap) 90 { 91 } 92 93 static void 94 hostap_vattach(struct ieee80211vap *vap) 95 { 96 vap->iv_newstate = hostap_newstate; 97 vap->iv_input = hostap_input; 98 vap->iv_recv_mgmt = hostap_recv_mgmt; 99 vap->iv_recv_ctl = hostap_recv_ctl; 100 vap->iv_opdetach = hostap_vdetach; 101 vap->iv_deliver_data = hostap_deliver_data; 102 } 103 104 static void 105 sta_disassoc(void *arg, struct ieee80211_node *ni) 106 { 107 struct ieee80211vap *vap = arg; 108 109 if (ni->ni_vap == vap && ni->ni_associd != 0) { 110 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 111 IEEE80211_REASON_ASSOC_LEAVE); 112 ieee80211_node_leave(ni); 113 } 114 } 115 116 static void 117 sta_csa(void *arg, struct ieee80211_node *ni) 118 { 119 struct ieee80211vap *vap = arg; 120 121 if (ni->ni_vap == vap && ni->ni_associd != 0) 122 if (ni->ni_inact > vap->iv_inact_init) { 123 ni->ni_inact = vap->iv_inact_init; 124 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 125 "%s: inact %u", __func__, ni->ni_inact); 126 } 127 } 128 129 static void 130 sta_drop(void *arg, struct ieee80211_node *ni) 131 { 132 struct ieee80211vap *vap = arg; 133 134 if (ni->ni_vap == vap && ni->ni_associd != 0) 135 ieee80211_node_leave(ni); 136 } 137 138 /* 139 * Does a channel change require associated stations to re-associate 140 * so protocol state is correct. This is used when doing CSA across 141 * bands or similar (e.g. HT -> legacy). 142 */ 143 static int 144 isbandchange(struct ieee80211com *ic) 145 { 146 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 147 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 148 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 149 } 150 151 /* 152 * IEEE80211_M_HOSTAP vap state machine handler. 153 */ 154 static int 155 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 156 { 157 struct ieee80211com *ic = vap->iv_ic; 158 enum ieee80211_state ostate; 159 160 IEEE80211_LOCK_ASSERT(ic); 161 162 ostate = vap->iv_state; 163 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 164 __func__, ieee80211_state_name[ostate], 165 ieee80211_state_name[nstate], arg); 166 vap->iv_state = nstate; /* state transition */ 167 if (ostate != IEEE80211_S_SCAN) 168 ieee80211_cancel_scan(vap); /* background scan */ 169 switch (nstate) { 170 case IEEE80211_S_INIT: 171 switch (ostate) { 172 case IEEE80211_S_SCAN: 173 ieee80211_cancel_scan(vap); 174 break; 175 case IEEE80211_S_CAC: 176 ieee80211_dfs_cac_stop(vap); 177 break; 178 case IEEE80211_S_RUN: 179 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 180 break; 181 default: 182 break; 183 } 184 if (ostate != IEEE80211_S_INIT) { 185 /* NB: optimize INIT -> INIT case */ 186 ieee80211_reset_bss(vap); 187 } 188 if (vap->iv_auth->ia_detach != NULL) 189 vap->iv_auth->ia_detach(vap); 190 break; 191 case IEEE80211_S_SCAN: 192 switch (ostate) { 193 case IEEE80211_S_CSA: 194 case IEEE80211_S_RUN: 195 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 196 /* 197 * Clear overlapping BSS state; the beacon frame 198 * will be reconstructed on transition to the RUN 199 * state and the timeout routines check if the flag 200 * is set before doing anything so this is sufficient. 201 */ 202 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 203 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 204 /* fall thru... */ 205 case IEEE80211_S_CAC: 206 /* 207 * NB: We may get here because of a manual channel 208 * change in which case we need to stop CAC 209 * XXX no need to stop if ostate RUN but it's ok 210 */ 211 ieee80211_dfs_cac_stop(vap); 212 /* fall thru... */ 213 case IEEE80211_S_INIT: 214 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 215 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 216 /* 217 * Already have a channel; bypass the 218 * scan and startup immediately. 219 * ieee80211_create_ibss will call back to 220 * move us to RUN state. 221 */ 222 ieee80211_create_ibss(vap, vap->iv_des_chan); 223 break; 224 } 225 /* 226 * Initiate a scan. We can come here as a result 227 * of an IEEE80211_IOC_SCAN_REQ too in which case 228 * the vap will be marked with IEEE80211_FEXT_SCANREQ 229 * and the scan request parameters will be present 230 * in iv_scanreq. Otherwise we do the default. 231 */ 232 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 233 ieee80211_check_scan(vap, 234 vap->iv_scanreq_flags, 235 vap->iv_scanreq_duration, 236 vap->iv_scanreq_mindwell, 237 vap->iv_scanreq_maxdwell, 238 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 239 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 240 } else 241 ieee80211_check_scan_current(vap); 242 break; 243 case IEEE80211_S_SCAN: 244 /* 245 * A state change requires a reset; scan. 246 */ 247 ieee80211_check_scan_current(vap); 248 break; 249 default: 250 break; 251 } 252 break; 253 case IEEE80211_S_CAC: 254 /* 255 * Start CAC on a DFS channel. We come here when starting 256 * a bss on a DFS channel (see ieee80211_create_ibss). 257 */ 258 ieee80211_dfs_cac_start(vap); 259 break; 260 case IEEE80211_S_RUN: 261 if (vap->iv_flags & IEEE80211_F_WPA) { 262 /* XXX validate prerequisites */ 263 } 264 switch (ostate) { 265 case IEEE80211_S_INIT: 266 /* 267 * Already have a channel; bypass the 268 * scan and startup immediately. 269 * Note that ieee80211_create_ibss will call 270 * back to do a RUN->RUN state change. 271 */ 272 ieee80211_create_ibss(vap, 273 ieee80211_ht_adjust_channel(ic, 274 ic->ic_curchan, vap->iv_flags_ht)); 275 /* NB: iv_bss is changed on return */ 276 break; 277 case IEEE80211_S_CAC: 278 /* 279 * NB: This is the normal state change when CAC 280 * expires and no radar was detected; no need to 281 * clear the CAC timer as it's already expired. 282 */ 283 /* fall thru... */ 284 case IEEE80211_S_CSA: 285 /* 286 * Shorten inactivity timer of associated stations 287 * to weed out sta's that don't follow a CSA. 288 */ 289 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 290 /* 291 * Update bss node channel to reflect where 292 * we landed after CSA. 293 */ 294 ieee80211_node_set_chan(vap->iv_bss, 295 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 296 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 297 /* XXX bypass debug msgs */ 298 break; 299 case IEEE80211_S_SCAN: 300 case IEEE80211_S_RUN: 301 #ifdef IEEE80211_DEBUG 302 if (ieee80211_msg_debug(vap)) { 303 struct ieee80211_node *ni = vap->iv_bss; 304 ieee80211_note(vap, 305 "synchronized with %6D ssid ", 306 ni->ni_bssid, ":"); 307 ieee80211_print_essid(ni->ni_essid, 308 ni->ni_esslen); 309 /* XXX MCS/HT */ 310 kprintf(" channel %d start %uMb\n", 311 ieee80211_chan2ieee(ic, ic->ic_curchan), 312 IEEE80211_RATE2MBS(ni->ni_txrate)); 313 } 314 #endif 315 break; 316 default: 317 break; 318 } 319 /* 320 * Start/stop the authenticator. We delay until here 321 * to allow configuration to happen out of order. 322 */ 323 if (vap->iv_auth->ia_attach != NULL) { 324 /* XXX check failure */ 325 vap->iv_auth->ia_attach(vap); 326 } else if (vap->iv_auth->ia_detach != NULL) { 327 vap->iv_auth->ia_detach(vap); 328 } 329 ieee80211_node_authorize(vap->iv_bss); 330 break; 331 case IEEE80211_S_CSA: 332 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 333 /* 334 * On a ``band change'' silently drop associated 335 * stations as they must re-associate before they 336 * can pass traffic (as otherwise protocol state 337 * such as capabilities and the negotiated rate 338 * set may/will be wrong). 339 */ 340 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 341 } 342 break; 343 default: 344 break; 345 } 346 return 0; 347 } 348 349 static void 350 hostap_deliver_data(struct ieee80211vap *vap, 351 struct ieee80211_node *ni, struct mbuf *m) 352 { 353 struct ether_header *eh = mtod(m, struct ether_header *); 354 struct ifnet *ifp = vap->iv_ifp; 355 356 /* clear driver/net80211 flags before passing up */ 357 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 358 359 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 360 ("gack, opmode %d", vap->iv_opmode)); 361 /* 362 * Do accounting. 363 */ 364 ifp->if_ipackets++; 365 IEEE80211_NODE_STAT(ni, rx_data); 366 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 367 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 368 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 369 IEEE80211_NODE_STAT(ni, rx_mcast); 370 } else 371 IEEE80211_NODE_STAT(ni, rx_ucast); 372 373 /* perform as a bridge within the AP */ 374 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 375 struct mbuf *mcopy = NULL; 376 377 if (m->m_flags & M_MCAST) { 378 mcopy = m_dup(m, MB_DONTWAIT); 379 if (mcopy == NULL) 380 ifp->if_oerrors++; 381 else 382 mcopy->m_flags |= M_MCAST; 383 } else { 384 /* 385 * Check if the destination is associated with the 386 * same vap and authorized to receive traffic. 387 * Beware of traffic destined for the vap itself; 388 * sending it will not work; just let it be delivered 389 * normally. 390 */ 391 struct ieee80211_node *sta = ieee80211_find_vap_node( 392 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 393 if (sta != NULL) { 394 if (ieee80211_node_is_authorized(sta)) { 395 /* 396 * Beware of sending to ourself; this 397 * needs to happen via the normal 398 * input path. 399 */ 400 if (sta != vap->iv_bss) { 401 mcopy = m; 402 m = NULL; 403 } 404 } else { 405 vap->iv_stats.is_rx_unauth++; 406 IEEE80211_NODE_STAT(sta, rx_unauth); 407 } 408 ieee80211_free_node(sta); 409 } 410 } 411 if (mcopy != NULL) { 412 int len, err; 413 len = mcopy->m_pkthdr.len; 414 err = ieee80211_handoff(ifp, mcopy); 415 if (err) { 416 /* NB: IFQ_HANDOFF reclaims mcopy */ 417 } else { 418 ifp->if_opackets++; 419 } 420 } 421 } 422 if (m != NULL) { 423 /* 424 * Mark frame as coming from vap's interface. 425 */ 426 m->m_pkthdr.rcvif = ifp; 427 if (m->m_flags & M_MCAST) { 428 /* 429 * Spam DWDS vap's w/ multicast traffic. 430 */ 431 /* XXX only if dwds in use? */ 432 ieee80211_dwds_mcast(vap, m); 433 } 434 if (ni->ni_vlan != 0) { 435 /* attach vlan tag */ 436 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 437 m->m_flags |= M_VLANTAG; 438 } 439 ifp->if_input(ifp, m); 440 } 441 } 442 443 /* 444 * Decide if a received management frame should be 445 * printed when debugging is enabled. This filters some 446 * of the less interesting frames that come frequently 447 * (e.g. beacons). 448 */ 449 static __inline int 450 doprint(struct ieee80211vap *vap, int subtype) 451 { 452 switch (subtype) { 453 case IEEE80211_FC0_SUBTYPE_BEACON: 454 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 455 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 456 return 0; 457 } 458 return 1; 459 } 460 461 /* 462 * Process a received frame. The node associated with the sender 463 * should be supplied. If nothing was found in the node table then 464 * the caller is assumed to supply a reference to iv_bss instead. 465 * The RSSI and a timestamp are also supplied. The RSSI data is used 466 * during AP scanning to select a AP to associate with; it can have 467 * any units so long as values have consistent units and higher values 468 * mean ``better signal''. The receive timestamp is currently not used 469 * by the 802.11 layer. 470 */ 471 static int 472 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 473 { 474 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 475 #define HAS_SEQ(type) ((type & 0x4) == 0) 476 struct ieee80211vap *vap = ni->ni_vap; 477 struct ieee80211com *ic = ni->ni_ic; 478 struct ifnet *ifp = vap->iv_ifp; 479 struct ieee80211_frame *wh; 480 struct ieee80211_key *key; 481 struct ether_header *eh; 482 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 483 uint8_t dir, type, subtype, qos; 484 uint8_t *bssid; 485 uint16_t rxseq; 486 487 if (m->m_flags & M_AMPDU_MPDU) { 488 /* 489 * Fastpath for A-MPDU reorder q resubmission. Frames 490 * w/ M_AMPDU_MPDU marked have already passed through 491 * here but were received out of order and been held on 492 * the reorder queue. When resubmitted they are marked 493 * with the M_AMPDU_MPDU flag and we can bypass most of 494 * the normal processing. 495 */ 496 wh = mtod(m, struct ieee80211_frame *); 497 type = IEEE80211_FC0_TYPE_DATA; 498 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 499 subtype = IEEE80211_FC0_SUBTYPE_QOS; 500 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 501 goto resubmit_ampdu; 502 } 503 504 KASSERT(ni != NULL, ("null node")); 505 ni->ni_inact = ni->ni_inact_reload; 506 507 type = -1; /* undefined */ 508 509 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 510 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 511 ni->ni_macaddr, NULL, 512 "too short (1): len %u", m->m_pkthdr.len); 513 vap->iv_stats.is_rx_tooshort++; 514 goto out; 515 } 516 /* 517 * Bit of a cheat here, we use a pointer for a 3-address 518 * frame format but don't reference fields past outside 519 * ieee80211_frame_min w/o first validating the data is 520 * present. 521 */ 522 wh = mtod(m, struct ieee80211_frame *); 523 524 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 525 IEEE80211_FC0_VERSION_0) { 526 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 527 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 528 wh->i_fc[0], wh->i_fc[1]); 529 vap->iv_stats.is_rx_badversion++; 530 goto err; 531 } 532 533 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 534 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 535 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 536 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 537 if (dir != IEEE80211_FC1_DIR_NODS) 538 bssid = wh->i_addr1; 539 else if (type == IEEE80211_FC0_TYPE_CTL) 540 bssid = wh->i_addr1; 541 else { 542 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 543 IEEE80211_DISCARD_MAC(vap, 544 IEEE80211_MSG_ANY, ni->ni_macaddr, 545 NULL, "too short (2): len %u", 546 m->m_pkthdr.len); 547 vap->iv_stats.is_rx_tooshort++; 548 goto out; 549 } 550 bssid = wh->i_addr3; 551 } 552 /* 553 * Validate the bssid. 554 */ 555 if (!(type == IEEE80211_FC0_TYPE_MGT && 556 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 557 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 558 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 559 /* not interested in */ 560 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 561 bssid, NULL, "%s", "not to bss"); 562 vap->iv_stats.is_rx_wrongbss++; 563 goto out; 564 } 565 566 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 567 ni->ni_noise = nf; 568 if (HAS_SEQ(type)) { 569 uint8_t tid = ieee80211_gettid(wh); 570 if (IEEE80211_QOS_HAS_SEQ(wh) && 571 TID_TO_WME_AC(tid) >= WME_AC_VI) 572 ic->ic_wme.wme_hipri_traffic++; 573 rxseq = le16toh(*(uint16_t *)wh->i_seq); 574 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 575 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 576 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 577 /* duplicate, discard */ 578 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 579 bssid, "duplicate", 580 "seqno <%u,%u> fragno <%u,%u> tid %u", 581 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 582 ni->ni_rxseqs[tid] >> 583 IEEE80211_SEQ_SEQ_SHIFT, 584 rxseq & IEEE80211_SEQ_FRAG_MASK, 585 ni->ni_rxseqs[tid] & 586 IEEE80211_SEQ_FRAG_MASK, 587 tid); 588 vap->iv_stats.is_rx_dup++; 589 IEEE80211_NODE_STAT(ni, rx_dup); 590 goto out; 591 } 592 ni->ni_rxseqs[tid] = rxseq; 593 } 594 } 595 596 switch (type) { 597 case IEEE80211_FC0_TYPE_DATA: 598 hdrspace = ieee80211_hdrspace(ic, wh); 599 if (m->m_len < hdrspace && 600 (m = m_pullup(m, hdrspace)) == NULL) { 601 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 602 ni->ni_macaddr, NULL, 603 "data too short: expecting %u", hdrspace); 604 vap->iv_stats.is_rx_tooshort++; 605 goto out; /* XXX */ 606 } 607 if (!(dir == IEEE80211_FC1_DIR_TODS || 608 (dir == IEEE80211_FC1_DIR_DSTODS && 609 (vap->iv_flags & IEEE80211_F_DWDS)))) { 610 if (dir != IEEE80211_FC1_DIR_DSTODS) { 611 IEEE80211_DISCARD(vap, 612 IEEE80211_MSG_INPUT, wh, "data", 613 "incorrect dir 0x%x", dir); 614 } else { 615 IEEE80211_DISCARD(vap, 616 IEEE80211_MSG_INPUT | 617 IEEE80211_MSG_WDS, wh, 618 "4-address data", 619 "%s", "DWDS not enabled"); 620 } 621 vap->iv_stats.is_rx_wrongdir++; 622 goto out; 623 } 624 /* check if source STA is associated */ 625 if (ni == vap->iv_bss) { 626 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 627 wh, "data", "%s", "unknown src"); 628 ieee80211_send_error(ni, wh->i_addr2, 629 IEEE80211_FC0_SUBTYPE_DEAUTH, 630 IEEE80211_REASON_NOT_AUTHED); 631 vap->iv_stats.is_rx_notassoc++; 632 goto err; 633 } 634 if (ni->ni_associd == 0) { 635 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 636 wh, "data", "%s", "unassoc src"); 637 IEEE80211_SEND_MGMT(ni, 638 IEEE80211_FC0_SUBTYPE_DISASSOC, 639 IEEE80211_REASON_NOT_ASSOCED); 640 vap->iv_stats.is_rx_notassoc++; 641 goto err; 642 } 643 644 /* 645 * Check for power save state change. 646 * XXX out-of-order A-MPDU frames? 647 */ 648 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 649 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 650 ieee80211_node_pwrsave(ni, 651 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 652 /* 653 * For 4-address packets handle WDS discovery 654 * notifications. Once a WDS link is setup frames 655 * are just delivered to the WDS vap (see below). 656 */ 657 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 658 if (!ieee80211_node_is_authorized(ni)) { 659 IEEE80211_DISCARD(vap, 660 IEEE80211_MSG_INPUT | 661 IEEE80211_MSG_WDS, wh, 662 "4-address data", 663 "%s", "unauthorized port"); 664 vap->iv_stats.is_rx_unauth++; 665 IEEE80211_NODE_STAT(ni, rx_unauth); 666 goto err; 667 } 668 ieee80211_dwds_discover(ni, m); 669 return type; 670 } 671 672 /* 673 * Handle A-MPDU re-ordering. If the frame is to be 674 * processed directly then ieee80211_ampdu_reorder 675 * will return 0; otherwise it has consumed the mbuf 676 * and we should do nothing more with it. 677 */ 678 if ((m->m_flags & M_AMPDU) && 679 ieee80211_ampdu_reorder(ni, m) != 0) { 680 m = NULL; 681 goto out; 682 } 683 resubmit_ampdu: 684 685 /* 686 * Handle privacy requirements. Note that we 687 * must not be preempted from here until after 688 * we (potentially) call ieee80211_crypto_demic; 689 * otherwise we may violate assumptions in the 690 * crypto cipher modules used to do delayed update 691 * of replay sequence numbers. 692 */ 693 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 694 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 695 /* 696 * Discard encrypted frames when privacy is off. 697 */ 698 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 699 wh, "WEP", "%s", "PRIVACY off"); 700 vap->iv_stats.is_rx_noprivacy++; 701 IEEE80211_NODE_STAT(ni, rx_noprivacy); 702 goto out; 703 } 704 key = ieee80211_crypto_decap(ni, m, hdrspace); 705 if (key == NULL) { 706 /* NB: stats+msgs handled in crypto_decap */ 707 IEEE80211_NODE_STAT(ni, rx_wepfail); 708 goto out; 709 } 710 wh = mtod(m, struct ieee80211_frame *); 711 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 712 } else { 713 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 714 key = NULL; 715 } 716 717 /* 718 * Save QoS bits for use below--before we strip the header. 719 */ 720 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 721 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 722 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 723 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 724 } else 725 qos = 0; 726 727 /* 728 * Next up, any fragmentation. 729 */ 730 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 731 m = ieee80211_defrag(ni, m, hdrspace); 732 if (m == NULL) { 733 /* Fragment dropped or frame not complete yet */ 734 goto out; 735 } 736 } 737 wh = NULL; /* no longer valid, catch any uses */ 738 739 /* 740 * Next strip any MSDU crypto bits. 741 */ 742 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 743 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 744 ni->ni_macaddr, "data", "%s", "demic error"); 745 vap->iv_stats.is_rx_demicfail++; 746 IEEE80211_NODE_STAT(ni, rx_demicfail); 747 goto out; 748 } 749 /* copy to listener after decrypt */ 750 if (ieee80211_radiotap_active_vap(vap)) 751 ieee80211_radiotap_rx(vap, m); 752 need_tap = 0; 753 /* 754 * Finally, strip the 802.11 header. 755 */ 756 m = ieee80211_decap(vap, m, hdrspace); 757 if (m == NULL) { 758 /* XXX mask bit to check for both */ 759 /* don't count Null data frames as errors */ 760 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 761 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 762 goto out; 763 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 764 ni->ni_macaddr, "data", "%s", "decap error"); 765 vap->iv_stats.is_rx_decap++; 766 IEEE80211_NODE_STAT(ni, rx_decap); 767 goto err; 768 } 769 eh = mtod(m, struct ether_header *); 770 if (!ieee80211_node_is_authorized(ni)) { 771 /* 772 * Deny any non-PAE frames received prior to 773 * authorization. For open/shared-key 774 * authentication the port is mark authorized 775 * after authentication completes. For 802.1x 776 * the port is not marked authorized by the 777 * authenticator until the handshake has completed. 778 */ 779 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 780 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 781 eh->ether_shost, "data", 782 "unauthorized port: ether type 0x%x len %u", 783 eh->ether_type, m->m_pkthdr.len); 784 vap->iv_stats.is_rx_unauth++; 785 IEEE80211_NODE_STAT(ni, rx_unauth); 786 goto err; 787 } 788 } else { 789 /* 790 * When denying unencrypted frames, discard 791 * any non-PAE frames received without encryption. 792 */ 793 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 794 (key == NULL && (m->m_flags & M_WEP) == 0) && 795 eh->ether_type != htons(ETHERTYPE_PAE)) { 796 /* 797 * Drop unencrypted frames. 798 */ 799 vap->iv_stats.is_rx_unencrypted++; 800 IEEE80211_NODE_STAT(ni, rx_unencrypted); 801 goto out; 802 } 803 } 804 /* XXX require HT? */ 805 if (qos & IEEE80211_QOS_AMSDU) { 806 m = ieee80211_decap_amsdu(ni, m); 807 if (m == NULL) 808 return IEEE80211_FC0_TYPE_DATA; 809 } else { 810 #ifdef IEEE80211_SUPPORT_SUPERG 811 m = ieee80211_decap_fastframe(vap, ni, m); 812 if (m == NULL) 813 return IEEE80211_FC0_TYPE_DATA; 814 #endif 815 } 816 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 817 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 818 else 819 hostap_deliver_data(vap, ni, m); 820 return IEEE80211_FC0_TYPE_DATA; 821 822 case IEEE80211_FC0_TYPE_MGT: 823 vap->iv_stats.is_rx_mgmt++; 824 IEEE80211_NODE_STAT(ni, rx_mgmt); 825 if (dir != IEEE80211_FC1_DIR_NODS) { 826 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 827 wh, "mgt", "incorrect dir 0x%x", dir); 828 vap->iv_stats.is_rx_wrongdir++; 829 goto err; 830 } 831 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 832 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 833 ni->ni_macaddr, "mgt", "too short: len %u", 834 m->m_pkthdr.len); 835 vap->iv_stats.is_rx_tooshort++; 836 goto out; 837 } 838 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 839 /* ensure return frames are unicast */ 840 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 841 wh, NULL, "source is multicast: %6D", 842 wh->i_addr2, ":"); 843 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 844 goto out; 845 } 846 #ifdef IEEE80211_DEBUG 847 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 848 ieee80211_msg_dumppkts(vap)) { 849 if_printf(ifp, "received %s from %6D rssi %d\n", 850 ieee80211_mgt_subtype_name[subtype >> 851 IEEE80211_FC0_SUBTYPE_SHIFT], 852 wh->i_addr2, ":", rssi); 853 } 854 #endif 855 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 856 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 857 /* 858 * Only shared key auth frames with a challenge 859 * should be encrypted, discard all others. 860 */ 861 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 862 wh, NULL, 863 "%s", "WEP set but not permitted"); 864 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 865 goto out; 866 } 867 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 868 /* 869 * Discard encrypted frames when privacy is off. 870 */ 871 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 872 wh, NULL, "%s", "WEP set but PRIVACY off"); 873 vap->iv_stats.is_rx_noprivacy++; 874 goto out; 875 } 876 hdrspace = ieee80211_hdrspace(ic, wh); 877 key = ieee80211_crypto_decap(ni, m, hdrspace); 878 if (key == NULL) { 879 /* NB: stats+msgs handled in crypto_decap */ 880 goto out; 881 } 882 wh = mtod(m, struct ieee80211_frame *); 883 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 884 } 885 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 886 goto out; 887 888 case IEEE80211_FC0_TYPE_CTL: 889 vap->iv_stats.is_rx_ctl++; 890 IEEE80211_NODE_STAT(ni, rx_ctrl); 891 vap->iv_recv_ctl(ni, m, subtype); 892 goto out; 893 default: 894 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 895 wh, "bad", "frame type 0x%x", type); 896 /* should not come here */ 897 break; 898 } 899 err: 900 ifp->if_ierrors++; 901 out: 902 if (m != NULL) { 903 if (need_tap && ieee80211_radiotap_active_vap(vap)) 904 ieee80211_radiotap_rx(vap, m); 905 m_freem(m); 906 } 907 return type; 908 #undef SEQ_LEQ 909 } 910 911 static void 912 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 913 int rssi, int nf, uint16_t seq, uint16_t status) 914 { 915 struct ieee80211vap *vap = ni->ni_vap; 916 917 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 918 919 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 920 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 921 ni->ni_macaddr, "open auth", 922 "bad sta auth mode %u", ni->ni_authmode); 923 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 924 /* 925 * Clear any challenge text that may be there if 926 * a previous shared key auth failed and then an 927 * open auth is attempted. 928 */ 929 if (ni->ni_challenge != NULL) { 930 kfree(ni->ni_challenge, M_80211_NODE); 931 ni->ni_challenge = NULL; 932 } 933 /* XXX hack to workaround calling convention */ 934 ieee80211_send_error(ni, wh->i_addr2, 935 IEEE80211_FC0_SUBTYPE_AUTH, 936 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 937 return; 938 } 939 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 940 vap->iv_stats.is_rx_bad_auth++; 941 return; 942 } 943 /* always accept open authentication requests */ 944 if (ni == vap->iv_bss) { 945 ni = ieee80211_dup_bss(vap, wh->i_addr2); 946 if (ni == NULL) 947 return; 948 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 949 (void) ieee80211_ref_node(ni); 950 /* 951 * Mark the node as referenced to reflect that it's 952 * reference count has been bumped to insure it remains 953 * after the transaction completes. 954 */ 955 ni->ni_flags |= IEEE80211_NODE_AREF; 956 /* 957 * Mark the node as requiring a valid association id 958 * before outbound traffic is permitted. 959 */ 960 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 961 962 if (vap->iv_acl != NULL && 963 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 964 /* 965 * When the ACL policy is set to RADIUS we defer the 966 * authorization to a user agent. Dispatch an event, 967 * a subsequent MLME call will decide the fate of the 968 * station. If the user agent is not present then the 969 * node will be reclaimed due to inactivity. 970 */ 971 IEEE80211_NOTE_MAC(vap, 972 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 973 "%s", "station authentication defered (radius acl)"); 974 ieee80211_notify_node_auth(ni); 975 } else { 976 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 977 IEEE80211_NOTE_MAC(vap, 978 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 979 "%s", "station authenticated (open)"); 980 /* 981 * When 802.1x is not in use mark the port 982 * authorized at this point so traffic can flow. 983 */ 984 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 985 ieee80211_node_authorize(ni); 986 } 987 } 988 989 static void 990 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 991 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 992 uint16_t seq, uint16_t status) 993 { 994 struct ieee80211vap *vap = ni->ni_vap; 995 uint8_t *challenge; 996 int allocbs, estatus; 997 998 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 999 1000 /* 1001 * NB: this can happen as we allow pre-shared key 1002 * authentication to be enabled w/o wep being turned 1003 * on so that configuration of these can be done 1004 * in any order. It may be better to enforce the 1005 * ordering in which case this check would just be 1006 * for sanity/consistency. 1007 */ 1008 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1009 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1010 ni->ni_macaddr, "shared key auth", 1011 "%s", " PRIVACY is disabled"); 1012 estatus = IEEE80211_STATUS_ALG; 1013 goto bad; 1014 } 1015 /* 1016 * Pre-shared key authentication is evil; accept 1017 * it only if explicitly configured (it is supported 1018 * mainly for compatibility with clients like Mac OS X). 1019 */ 1020 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1021 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1022 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1023 ni->ni_macaddr, "shared key auth", 1024 "bad sta auth mode %u", ni->ni_authmode); 1025 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1026 estatus = IEEE80211_STATUS_ALG; 1027 goto bad; 1028 } 1029 1030 challenge = NULL; 1031 if (frm + 1 < efrm) { 1032 if ((frm[1] + 2) > (efrm - frm)) { 1033 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1034 ni->ni_macaddr, "shared key auth", 1035 "ie %d/%d too long", 1036 frm[0], (frm[1] + 2) - (efrm - frm)); 1037 vap->iv_stats.is_rx_bad_auth++; 1038 estatus = IEEE80211_STATUS_CHALLENGE; 1039 goto bad; 1040 } 1041 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1042 challenge = frm; 1043 frm += frm[1] + 2; 1044 } 1045 switch (seq) { 1046 case IEEE80211_AUTH_SHARED_CHALLENGE: 1047 case IEEE80211_AUTH_SHARED_RESPONSE: 1048 if (challenge == NULL) { 1049 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1050 ni->ni_macaddr, "shared key auth", 1051 "%s", "no challenge"); 1052 vap->iv_stats.is_rx_bad_auth++; 1053 estatus = IEEE80211_STATUS_CHALLENGE; 1054 goto bad; 1055 } 1056 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1057 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1058 ni->ni_macaddr, "shared key auth", 1059 "bad challenge len %d", challenge[1]); 1060 vap->iv_stats.is_rx_bad_auth++; 1061 estatus = IEEE80211_STATUS_CHALLENGE; 1062 goto bad; 1063 } 1064 default: 1065 break; 1066 } 1067 switch (seq) { 1068 case IEEE80211_AUTH_SHARED_REQUEST: 1069 if (ni == vap->iv_bss) { 1070 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1071 if (ni == NULL) { 1072 /* NB: no way to return an error */ 1073 return; 1074 } 1075 allocbs = 1; 1076 } else { 1077 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1078 (void) ieee80211_ref_node(ni); 1079 allocbs = 0; 1080 } 1081 /* 1082 * Mark the node as referenced to reflect that it's 1083 * reference count has been bumped to insure it remains 1084 * after the transaction completes. 1085 */ 1086 ni->ni_flags |= IEEE80211_NODE_AREF; 1087 /* 1088 * Mark the node as requiring a valid associatio id 1089 * before outbound traffic is permitted. 1090 */ 1091 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1092 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1093 ni->ni_noise = nf; 1094 if (!ieee80211_alloc_challenge(ni)) { 1095 /* NB: don't return error so they rexmit */ 1096 return; 1097 } 1098 get_random_bytes(ni->ni_challenge, 1099 IEEE80211_CHALLENGE_LEN); 1100 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1101 ni, "shared key %sauth request", allocbs ? "" : "re"); 1102 /* 1103 * When the ACL policy is set to RADIUS we defer the 1104 * authorization to a user agent. Dispatch an event, 1105 * a subsequent MLME call will decide the fate of the 1106 * station. If the user agent is not present then the 1107 * node will be reclaimed due to inactivity. 1108 */ 1109 if (vap->iv_acl != NULL && 1110 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1111 IEEE80211_NOTE_MAC(vap, 1112 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1113 ni->ni_macaddr, 1114 "%s", "station authentication defered (radius acl)"); 1115 ieee80211_notify_node_auth(ni); 1116 return; 1117 } 1118 break; 1119 case IEEE80211_AUTH_SHARED_RESPONSE: 1120 if (ni == vap->iv_bss) { 1121 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1122 ni->ni_macaddr, "shared key response", 1123 "%s", "unknown station"); 1124 /* NB: don't send a response */ 1125 return; 1126 } 1127 if (ni->ni_challenge == NULL) { 1128 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1129 ni->ni_macaddr, "shared key response", 1130 "%s", "no challenge recorded"); 1131 vap->iv_stats.is_rx_bad_auth++; 1132 estatus = IEEE80211_STATUS_CHALLENGE; 1133 goto bad; 1134 } 1135 if (memcmp(ni->ni_challenge, &challenge[2], 1136 challenge[1]) != 0) { 1137 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1138 ni->ni_macaddr, "shared key response", 1139 "%s", "challenge mismatch"); 1140 vap->iv_stats.is_rx_auth_fail++; 1141 estatus = IEEE80211_STATUS_CHALLENGE; 1142 goto bad; 1143 } 1144 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1145 ni, "%s", "station authenticated (shared key)"); 1146 ieee80211_node_authorize(ni); 1147 break; 1148 default: 1149 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1150 ni->ni_macaddr, "shared key auth", 1151 "bad seq %d", seq); 1152 vap->iv_stats.is_rx_bad_auth++; 1153 estatus = IEEE80211_STATUS_SEQUENCE; 1154 goto bad; 1155 } 1156 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1157 return; 1158 bad: 1159 /* 1160 * Send an error response; but only when operating as an AP. 1161 */ 1162 /* XXX hack to workaround calling convention */ 1163 ieee80211_send_error(ni, wh->i_addr2, 1164 IEEE80211_FC0_SUBTYPE_AUTH, 1165 (seq + 1) | (estatus<<16)); 1166 } 1167 1168 /* 1169 * Convert a WPA cipher selector OUI to an internal 1170 * cipher algorithm. Where appropriate we also 1171 * record any key length. 1172 */ 1173 static int 1174 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1175 { 1176 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1177 uint32_t w = LE_READ_4(sel); 1178 1179 switch (w) { 1180 case WPA_SEL(WPA_CSE_NULL): 1181 return IEEE80211_CIPHER_NONE; 1182 case WPA_SEL(WPA_CSE_WEP40): 1183 if (keylen) 1184 *keylen = 40 / NBBY; 1185 return IEEE80211_CIPHER_WEP; 1186 case WPA_SEL(WPA_CSE_WEP104): 1187 if (keylen) 1188 *keylen = 104 / NBBY; 1189 return IEEE80211_CIPHER_WEP; 1190 case WPA_SEL(WPA_CSE_TKIP): 1191 return IEEE80211_CIPHER_TKIP; 1192 case WPA_SEL(WPA_CSE_CCMP): 1193 return IEEE80211_CIPHER_AES_CCM; 1194 } 1195 return 32; /* NB: so 1<< is discarded */ 1196 #undef WPA_SEL 1197 } 1198 1199 /* 1200 * Convert a WPA key management/authentication algorithm 1201 * to an internal code. 1202 */ 1203 static int 1204 wpa_keymgmt(const uint8_t *sel) 1205 { 1206 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1207 uint32_t w = LE_READ_4(sel); 1208 1209 switch (w) { 1210 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1211 return WPA_ASE_8021X_UNSPEC; 1212 case WPA_SEL(WPA_ASE_8021X_PSK): 1213 return WPA_ASE_8021X_PSK; 1214 case WPA_SEL(WPA_ASE_NONE): 1215 return WPA_ASE_NONE; 1216 } 1217 return 0; /* NB: so is discarded */ 1218 #undef WPA_SEL 1219 } 1220 1221 /* 1222 * Parse a WPA information element to collect parameters. 1223 * Note that we do not validate security parameters; that 1224 * is handled by the authenticator; the parsing done here 1225 * is just for internal use in making operational decisions. 1226 */ 1227 static int 1228 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1229 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1230 { 1231 uint8_t len = frm[1]; 1232 uint32_t w; 1233 int n; 1234 1235 /* 1236 * Check the length once for fixed parts: OUI, type, 1237 * version, mcast cipher, and 2 selector counts. 1238 * Other, variable-length data, must be checked separately. 1239 */ 1240 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1241 IEEE80211_DISCARD_IE(vap, 1242 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1243 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1244 return IEEE80211_REASON_IE_INVALID; 1245 } 1246 if (len < 14) { 1247 IEEE80211_DISCARD_IE(vap, 1248 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1249 wh, "WPA", "too short, len %u", len); 1250 return IEEE80211_REASON_IE_INVALID; 1251 } 1252 frm += 6, len -= 4; /* NB: len is payload only */ 1253 /* NB: iswpaoui already validated the OUI and type */ 1254 w = LE_READ_2(frm); 1255 if (w != WPA_VERSION) { 1256 IEEE80211_DISCARD_IE(vap, 1257 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1258 wh, "WPA", "bad version %u", w); 1259 return IEEE80211_REASON_IE_INVALID; 1260 } 1261 frm += 2, len -= 2; 1262 1263 memset(rsn, 0, sizeof(*rsn)); 1264 1265 /* multicast/group cipher */ 1266 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1267 frm += 4, len -= 4; 1268 1269 /* unicast ciphers */ 1270 n = LE_READ_2(frm); 1271 frm += 2, len -= 2; 1272 if (len < n*4+2) { 1273 IEEE80211_DISCARD_IE(vap, 1274 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1275 wh, "WPA", "ucast cipher 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 |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1282 frm += 4, len -= 4; 1283 } 1284 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1285 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1286 else 1287 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1288 1289 /* key management algorithms */ 1290 n = LE_READ_2(frm); 1291 frm += 2, len -= 2; 1292 if (len < n*4) { 1293 IEEE80211_DISCARD_IE(vap, 1294 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1295 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1296 len, n); 1297 return IEEE80211_REASON_IE_INVALID; 1298 } 1299 w = 0; 1300 for (; n > 0; n--) { 1301 w |= wpa_keymgmt(frm); 1302 frm += 4, len -= 4; 1303 } 1304 if (w & WPA_ASE_8021X_UNSPEC) 1305 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1306 else 1307 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1308 1309 if (len > 2) /* optional capabilities */ 1310 rsn->rsn_caps = LE_READ_2(frm); 1311 1312 return 0; 1313 } 1314 1315 /* 1316 * Convert an RSN cipher selector OUI to an internal 1317 * cipher algorithm. Where appropriate we also 1318 * record any key length. 1319 */ 1320 static int 1321 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1322 { 1323 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1324 uint32_t w = LE_READ_4(sel); 1325 1326 switch (w) { 1327 case RSN_SEL(RSN_CSE_NULL): 1328 return IEEE80211_CIPHER_NONE; 1329 case RSN_SEL(RSN_CSE_WEP40): 1330 if (keylen) 1331 *keylen = 40 / NBBY; 1332 return IEEE80211_CIPHER_WEP; 1333 case RSN_SEL(RSN_CSE_WEP104): 1334 if (keylen) 1335 *keylen = 104 / NBBY; 1336 return IEEE80211_CIPHER_WEP; 1337 case RSN_SEL(RSN_CSE_TKIP): 1338 return IEEE80211_CIPHER_TKIP; 1339 case RSN_SEL(RSN_CSE_CCMP): 1340 return IEEE80211_CIPHER_AES_CCM; 1341 case RSN_SEL(RSN_CSE_WRAP): 1342 return IEEE80211_CIPHER_AES_OCB; 1343 } 1344 return 32; /* NB: so 1<< is discarded */ 1345 #undef WPA_SEL 1346 } 1347 1348 /* 1349 * Convert an RSN key management/authentication algorithm 1350 * to an internal code. 1351 */ 1352 static int 1353 rsn_keymgmt(const uint8_t *sel) 1354 { 1355 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1356 uint32_t w = LE_READ_4(sel); 1357 1358 switch (w) { 1359 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1360 return RSN_ASE_8021X_UNSPEC; 1361 case RSN_SEL(RSN_ASE_8021X_PSK): 1362 return RSN_ASE_8021X_PSK; 1363 case RSN_SEL(RSN_ASE_NONE): 1364 return RSN_ASE_NONE; 1365 } 1366 return 0; /* NB: so is discarded */ 1367 #undef RSN_SEL 1368 } 1369 1370 /* 1371 * Parse a WPA/RSN information element to collect parameters 1372 * and validate the parameters against what has been 1373 * configured for the system. 1374 */ 1375 static int 1376 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1377 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1378 { 1379 uint8_t len = frm[1]; 1380 uint32_t w; 1381 int n; 1382 1383 /* 1384 * Check the length once for fixed parts: 1385 * version, mcast cipher, and 2 selector counts. 1386 * Other, variable-length data, must be checked separately. 1387 */ 1388 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1389 IEEE80211_DISCARD_IE(vap, 1390 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1391 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1392 return IEEE80211_REASON_IE_INVALID; 1393 } 1394 if (len < 10) { 1395 IEEE80211_DISCARD_IE(vap, 1396 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1397 wh, "RSN", "too short, len %u", len); 1398 return IEEE80211_REASON_IE_INVALID; 1399 } 1400 frm += 2; 1401 w = LE_READ_2(frm); 1402 if (w != RSN_VERSION) { 1403 IEEE80211_DISCARD_IE(vap, 1404 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1405 wh, "RSN", "bad version %u", w); 1406 return IEEE80211_REASON_IE_INVALID; 1407 } 1408 frm += 2, len -= 2; 1409 1410 memset(rsn, 0, sizeof(*rsn)); 1411 1412 /* multicast/group cipher */ 1413 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1414 frm += 4, len -= 4; 1415 1416 /* unicast ciphers */ 1417 n = LE_READ_2(frm); 1418 frm += 2, len -= 2; 1419 if (len < n*4+2) { 1420 IEEE80211_DISCARD_IE(vap, 1421 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1422 wh, "RSN", "ucast cipher 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 |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1429 frm += 4, len -= 4; 1430 } 1431 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1432 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1433 else 1434 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1435 1436 /* key management algorithms */ 1437 n = LE_READ_2(frm); 1438 frm += 2, len -= 2; 1439 if (len < n*4) { 1440 IEEE80211_DISCARD_IE(vap, 1441 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1442 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1443 len, n); 1444 return IEEE80211_REASON_IE_INVALID; 1445 } 1446 w = 0; 1447 for (; n > 0; n--) { 1448 w |= rsn_keymgmt(frm); 1449 frm += 4, len -= 4; 1450 } 1451 if (w & RSN_ASE_8021X_UNSPEC) 1452 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1453 else 1454 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1455 1456 /* optional RSN capabilities */ 1457 if (len > 2) 1458 rsn->rsn_caps = LE_READ_2(frm); 1459 /* XXXPMKID */ 1460 1461 return 0; 1462 } 1463 1464 /* 1465 * WPA/802.11i assocation request processing. 1466 */ 1467 static int 1468 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1469 const struct ieee80211_frame *wh, const uint8_t *wpa, 1470 const uint8_t *rsn, uint16_t capinfo) 1471 { 1472 struct ieee80211vap *vap = ni->ni_vap; 1473 uint8_t reason; 1474 int badwparsn; 1475 1476 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1477 if (wpa == NULL && rsn == NULL) { 1478 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1479 /* 1480 * W-Fi Protected Setup (WPS) permits 1481 * clients to associate and pass EAPOL frames 1482 * to establish initial credentials. 1483 */ 1484 ni->ni_flags |= IEEE80211_NODE_WPS; 1485 return 1; 1486 } 1487 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1488 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1489 /* 1490 * Transitional Security Network. Permits clients 1491 * to associate and use WEP while WPA is configured. 1492 */ 1493 ni->ni_flags |= IEEE80211_NODE_TSN; 1494 return 1; 1495 } 1496 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1497 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1498 vap->iv_stats.is_rx_assoc_badwpaie++; 1499 reason = IEEE80211_REASON_IE_INVALID; 1500 goto bad; 1501 } 1502 /* assert right association security credentials */ 1503 badwparsn = 0; /* NB: to silence compiler */ 1504 switch (vap->iv_flags & IEEE80211_F_WPA) { 1505 case IEEE80211_F_WPA1: 1506 badwparsn = (wpa == NULL); 1507 break; 1508 case IEEE80211_F_WPA2: 1509 badwparsn = (rsn == NULL); 1510 break; 1511 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1512 badwparsn = (wpa == NULL && rsn == NULL); 1513 break; 1514 } 1515 if (badwparsn) { 1516 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1517 wh, NULL, 1518 "%s", "missing WPA/RSN IE in association request"); 1519 vap->iv_stats.is_rx_assoc_badwpaie++; 1520 reason = IEEE80211_REASON_IE_INVALID; 1521 goto bad; 1522 } 1523 /* 1524 * Parse WPA/RSN information element. 1525 */ 1526 if (wpa != NULL) 1527 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1528 else 1529 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1530 if (reason != 0) { 1531 /* XXX distinguish WPA/RSN? */ 1532 vap->iv_stats.is_rx_assoc_badwpaie++; 1533 goto bad; 1534 } 1535 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1536 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1537 wpa != NULL ? "WPA" : "RSN", 1538 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1539 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1540 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1541 1542 return 1; 1543 bad: 1544 ieee80211_node_deauth(ni, reason); 1545 return 0; 1546 } 1547 1548 /* XXX find a better place for definition */ 1549 struct l2_update_frame { 1550 struct ether_header eh; 1551 uint8_t dsap; 1552 uint8_t ssap; 1553 uint8_t control; 1554 uint8_t xid[3]; 1555 } __packed; 1556 1557 /* 1558 * Deliver a TGf L2UF frame on behalf of a station. 1559 * This primes any bridge when the station is roaming 1560 * between ap's on the same wired network. 1561 */ 1562 static void 1563 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1564 { 1565 struct ieee80211vap *vap = ni->ni_vap; 1566 struct ifnet *ifp = vap->iv_ifp; 1567 struct mbuf *m; 1568 struct l2_update_frame *l2uf; 1569 struct ether_header *eh; 1570 1571 m = m_gethdr(MB_DONTWAIT, MT_DATA); 1572 if (m == NULL) { 1573 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1574 "%s", "no mbuf for l2uf frame"); 1575 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1576 return; 1577 } 1578 l2uf = mtod(m, struct l2_update_frame *); 1579 eh = &l2uf->eh; 1580 /* dst: Broadcast address */ 1581 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1582 /* src: associated STA */ 1583 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1584 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1585 1586 l2uf->dsap = 0; 1587 l2uf->ssap = 0; 1588 l2uf->control = 0xf5; 1589 l2uf->xid[0] = 0x81; 1590 l2uf->xid[1] = 0x80; 1591 l2uf->xid[2] = 0x00; 1592 1593 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1594 hostap_deliver_data(vap, ni, m); 1595 } 1596 1597 static void 1598 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1599 int reassoc, int resp, const char *tag, int rate) 1600 { 1601 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1602 "deny %s request, %s rate set mismatch, rate/MCS %d", 1603 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1604 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1605 ieee80211_node_leave(ni); 1606 } 1607 1608 static void 1609 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1610 int reassoc, int resp, const char *tag, int capinfo) 1611 { 1612 struct ieee80211vap *vap = ni->ni_vap; 1613 1614 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1615 "deny %s request, %s mismatch 0x%x", 1616 reassoc ? "reassoc" : "assoc", tag, capinfo); 1617 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1618 ieee80211_node_leave(ni); 1619 vap->iv_stats.is_rx_assoc_capmismatch++; 1620 } 1621 1622 static void 1623 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1624 int reassoc, int resp) 1625 { 1626 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1627 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1628 /* XXX no better code */ 1629 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1630 ieee80211_node_leave(ni); 1631 } 1632 1633 static void 1634 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1635 int algo, int seq, int status) 1636 { 1637 struct ieee80211vap *vap = ni->ni_vap; 1638 1639 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1640 wh, NULL, "unsupported alg %d", algo); 1641 vap->iv_stats.is_rx_auth_unsupported++; 1642 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1643 seq | (status << 16)); 1644 } 1645 1646 static __inline int 1647 ishtmixed(const uint8_t *ie) 1648 { 1649 const struct ieee80211_ie_htinfo *ht = 1650 (const struct ieee80211_ie_htinfo *) ie; 1651 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1652 IEEE80211_HTINFO_OPMODE_MIXED; 1653 } 1654 1655 static int 1656 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1657 { 1658 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1659 int i; 1660 1661 /* NB: the 11b clients we care about will not have xrates */ 1662 if (xrates != NULL || rates == NULL) 1663 return 0; 1664 for (i = 0; i < rates[1]; i++) { 1665 int r = rates[2+i] & IEEE80211_RATE_VAL; 1666 if (r > 2*11 || ((1<<r) & brates) == 0) 1667 return 0; 1668 } 1669 return 1; 1670 } 1671 1672 static void 1673 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1674 int subtype, int rssi, int nf) 1675 { 1676 struct ieee80211vap *vap = ni->ni_vap; 1677 struct ieee80211com *ic = ni->ni_ic; 1678 struct ieee80211_frame *wh; 1679 uint8_t *frm, *efrm, *sfrm; 1680 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1681 int reassoc, resp; 1682 uint8_t rate; 1683 1684 wh = mtod(m0, struct ieee80211_frame *); 1685 frm = (uint8_t *)&wh[1]; 1686 efrm = mtod(m0, uint8_t *) + m0->m_len; 1687 switch (subtype) { 1688 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1689 case IEEE80211_FC0_SUBTYPE_BEACON: { 1690 struct ieee80211_scanparams scan; 1691 /* 1692 * We process beacon/probe response frames when scanning; 1693 * otherwise we check beacon frames for overlapping non-ERP 1694 * BSS in 11g and/or overlapping legacy BSS when in HT. 1695 */ 1696 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1697 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1698 vap->iv_stats.is_rx_mgtdiscard++; 1699 return; 1700 } 1701 /* NB: accept off-channel frames */ 1702 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1703 return; 1704 /* 1705 * Count frame now that we know it's to be processed. 1706 */ 1707 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1708 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1709 IEEE80211_NODE_STAT(ni, rx_beacons); 1710 } else 1711 IEEE80211_NODE_STAT(ni, rx_proberesp); 1712 /* 1713 * If scanning, just pass information to the scan module. 1714 */ 1715 if (ic->ic_flags & IEEE80211_F_SCAN) { 1716 if (scan.status == 0 && /* NB: on channel */ 1717 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1718 /* 1719 * Actively scanning a channel marked passive; 1720 * send a probe request now that we know there 1721 * is 802.11 traffic present. 1722 * 1723 * XXX check if the beacon we recv'd gives 1724 * us what we need and suppress the probe req 1725 */ 1726 ieee80211_probe_curchan(vap, 1); 1727 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1728 } 1729 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1730 return; 1731 } 1732 /* 1733 * Check beacon for overlapping bss w/ non ERP stations. 1734 * If we detect one and protection is configured but not 1735 * enabled, enable it and start a timer that'll bring us 1736 * out if we stop seeing the bss. 1737 */ 1738 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1739 scan.status == 0 && /* NB: on-channel */ 1740 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1741 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1742 ic->ic_lastnonerp = ticks; 1743 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1744 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1745 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1746 IEEE80211_NOTE_FRAME(vap, 1747 IEEE80211_MSG_ASSOC, wh, 1748 "non-ERP present on channel %d " 1749 "(saw erp 0x%x from channel %d), " 1750 "enable use of protection", 1751 ic->ic_curchan->ic_ieee, 1752 scan.erp, scan.chan); 1753 ic->ic_flags |= IEEE80211_F_USEPROT; 1754 ieee80211_notify_erp(ic); 1755 } 1756 } 1757 /* 1758 * Check beacon for non-HT station on HT channel 1759 * and update HT BSS occupancy as appropriate. 1760 */ 1761 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1762 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1763 /* 1764 * Off control channel; only check frames 1765 * that come in the extension channel when 1766 * operating w/ HT40. 1767 */ 1768 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1769 break; 1770 if (scan.chan != ic->ic_curchan->ic_extieee) 1771 break; 1772 } 1773 if (scan.htinfo == NULL) { 1774 ieee80211_htprot_update(ic, 1775 IEEE80211_HTINFO_OPMODE_PROTOPT | 1776 IEEE80211_HTINFO_NONHT_PRESENT); 1777 } else if (ishtmixed(scan.htinfo)) { 1778 /* XXX? take NONHT_PRESENT from beacon? */ 1779 ieee80211_htprot_update(ic, 1780 IEEE80211_HTINFO_OPMODE_MIXED | 1781 IEEE80211_HTINFO_NONHT_PRESENT); 1782 } 1783 } 1784 break; 1785 } 1786 1787 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1788 if (vap->iv_state != IEEE80211_S_RUN) { 1789 vap->iv_stats.is_rx_mgtdiscard++; 1790 return; 1791 } 1792 /* 1793 * prreq frame format 1794 * [tlv] ssid 1795 * [tlv] supported rates 1796 * [tlv] extended supported rates 1797 */ 1798 ssid = rates = xrates = NULL; 1799 sfrm = frm; 1800 while (efrm - frm > 1) { 1801 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1802 switch (*frm) { 1803 case IEEE80211_ELEMID_SSID: 1804 ssid = frm; 1805 break; 1806 case IEEE80211_ELEMID_RATES: 1807 rates = frm; 1808 break; 1809 case IEEE80211_ELEMID_XRATES: 1810 xrates = frm; 1811 break; 1812 } 1813 frm += frm[1] + 2; 1814 } 1815 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1816 if (xrates != NULL) 1817 IEEE80211_VERIFY_ELEMENT(xrates, 1818 IEEE80211_RATE_MAXSIZE - rates[1], return); 1819 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1820 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1821 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1822 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1823 wh, NULL, 1824 "%s", "no ssid with ssid suppression enabled"); 1825 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1826 return; 1827 } 1828 1829 /* XXX find a better class or define it's own */ 1830 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1831 "%s", "recv probe req"); 1832 /* 1833 * Some legacy 11b clients cannot hack a complete 1834 * probe response frame. When the request includes 1835 * only a bare-bones rate set, communicate this to 1836 * the transmit side. 1837 */ 1838 ieee80211_send_proberesp(vap, wh->i_addr2, 1839 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1840 break; 1841 1842 case IEEE80211_FC0_SUBTYPE_AUTH: { 1843 uint16_t algo, seq, status; 1844 1845 if (vap->iv_state != IEEE80211_S_RUN) { 1846 vap->iv_stats.is_rx_mgtdiscard++; 1847 return; 1848 } 1849 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1850 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1851 wh, NULL, "%s", "wrong bssid"); 1852 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1853 return; 1854 } 1855 /* 1856 * auth frame format 1857 * [2] algorithm 1858 * [2] sequence 1859 * [2] status 1860 * [tlv*] challenge 1861 */ 1862 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1863 algo = le16toh(*(uint16_t *)frm); 1864 seq = le16toh(*(uint16_t *)(frm + 2)); 1865 status = le16toh(*(uint16_t *)(frm + 4)); 1866 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1867 "recv auth frame with algorithm %d seq %d", algo, seq); 1868 /* 1869 * Consult the ACL policy module if setup. 1870 */ 1871 if (vap->iv_acl != NULL && 1872 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1873 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1874 wh, NULL, "%s", "disallowed by ACL"); 1875 vap->iv_stats.is_rx_acl++; 1876 ieee80211_send_error(ni, wh->i_addr2, 1877 IEEE80211_FC0_SUBTYPE_AUTH, 1878 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1879 return; 1880 } 1881 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1882 IEEE80211_DISCARD(vap, 1883 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1884 wh, NULL, "%s", "TKIP countermeasures enabled"); 1885 vap->iv_stats.is_rx_auth_countermeasures++; 1886 ieee80211_send_error(ni, wh->i_addr2, 1887 IEEE80211_FC0_SUBTYPE_AUTH, 1888 IEEE80211_REASON_MIC_FAILURE); 1889 return; 1890 } 1891 if (algo == IEEE80211_AUTH_ALG_SHARED) 1892 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1893 seq, status); 1894 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1895 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1896 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1897 authalgreject(ni, wh, algo, 1898 seq+1, IEEE80211_STATUS_ALG); 1899 return; 1900 } else { 1901 /* 1902 * We assume that an unknown algorithm is the result 1903 * of a decryption failure on a shared key auth frame; 1904 * return a status code appropriate for that instead 1905 * of IEEE80211_STATUS_ALG. 1906 * 1907 * NB: a seq# of 4 is intentional; the decrypted 1908 * frame likely has a bogus seq value. 1909 */ 1910 authalgreject(ni, wh, algo, 1911 4, IEEE80211_STATUS_CHALLENGE); 1912 return; 1913 } 1914 break; 1915 } 1916 1917 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1918 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1919 uint16_t capinfo, lintval; 1920 struct ieee80211_rsnparms rsnparms; 1921 1922 if (vap->iv_state != IEEE80211_S_RUN) { 1923 vap->iv_stats.is_rx_mgtdiscard++; 1924 return; 1925 } 1926 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1927 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1928 wh, NULL, "%s", "wrong bssid"); 1929 vap->iv_stats.is_rx_assoc_bss++; 1930 return; 1931 } 1932 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1933 reassoc = 1; 1934 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1935 } else { 1936 reassoc = 0; 1937 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1938 } 1939 if (ni == vap->iv_bss) { 1940 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1941 "deny %s request, sta not authenticated", 1942 reassoc ? "reassoc" : "assoc"); 1943 ieee80211_send_error(ni, wh->i_addr2, 1944 IEEE80211_FC0_SUBTYPE_DEAUTH, 1945 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1946 vap->iv_stats.is_rx_assoc_notauth++; 1947 return; 1948 } 1949 1950 /* 1951 * asreq frame format 1952 * [2] capability information 1953 * [2] listen interval 1954 * [6*] current AP address (reassoc only) 1955 * [tlv] ssid 1956 * [tlv] supported rates 1957 * [tlv] extended supported rates 1958 * [tlv] WPA or RSN 1959 * [tlv] HT capabilities 1960 * [tlv] Atheros capabilities 1961 */ 1962 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1963 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1964 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1965 if (reassoc) 1966 frm += 6; /* ignore current AP info */ 1967 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1968 sfrm = frm; 1969 while (efrm - frm > 1) { 1970 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1971 switch (*frm) { 1972 case IEEE80211_ELEMID_SSID: 1973 ssid = frm; 1974 break; 1975 case IEEE80211_ELEMID_RATES: 1976 rates = frm; 1977 break; 1978 case IEEE80211_ELEMID_XRATES: 1979 xrates = frm; 1980 break; 1981 case IEEE80211_ELEMID_RSN: 1982 rsn = frm; 1983 break; 1984 case IEEE80211_ELEMID_HTCAP: 1985 htcap = frm; 1986 break; 1987 case IEEE80211_ELEMID_VENDOR: 1988 if (iswpaoui(frm)) 1989 wpa = frm; 1990 else if (iswmeinfo(frm)) 1991 wme = frm; 1992 #ifdef IEEE80211_SUPPORT_SUPERG 1993 else if (isatherosoui(frm)) 1994 ath = frm; 1995 #endif 1996 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1997 if (ishtcapoui(frm) && htcap == NULL) 1998 htcap = frm; 1999 } 2000 break; 2001 } 2002 frm += frm[1] + 2; 2003 } 2004 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2005 if (xrates != NULL) 2006 IEEE80211_VERIFY_ELEMENT(xrates, 2007 IEEE80211_RATE_MAXSIZE - rates[1], return); 2008 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2009 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2010 if (htcap != NULL) { 2011 IEEE80211_VERIFY_LENGTH(htcap[1], 2012 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2013 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2014 sizeof(struct ieee80211_ie_htcap)-2, 2015 return); /* XXX just NULL out? */ 2016 } 2017 2018 if ((vap->iv_flags & IEEE80211_F_WPA) && 2019 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2020 return; 2021 /* discard challenge after association */ 2022 if (ni->ni_challenge != NULL) { 2023 kfree(ni->ni_challenge, M_80211_NODE); 2024 ni->ni_challenge = NULL; 2025 } 2026 /* NB: 802.11 spec says to ignore station's privacy bit */ 2027 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2028 capinfomismatch(ni, wh, reassoc, resp, 2029 "capability", capinfo); 2030 return; 2031 } 2032 /* 2033 * Disallow re-associate w/ invalid slot time setting. 2034 */ 2035 if (ni->ni_associd != 0 && 2036 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2037 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2038 capinfomismatch(ni, wh, reassoc, resp, 2039 "slot time", capinfo); 2040 return; 2041 } 2042 rate = ieee80211_setup_rates(ni, rates, xrates, 2043 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2044 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2045 if (rate & IEEE80211_RATE_BASIC) { 2046 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2047 vap->iv_stats.is_rx_assoc_norate++; 2048 return; 2049 } 2050 /* 2051 * If constrained to 11g-only stations reject an 2052 * 11b-only station. We cheat a bit here by looking 2053 * at the max negotiated xmit rate and assuming anyone 2054 * with a best rate <24Mb/s is an 11b station. 2055 */ 2056 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2057 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2058 vap->iv_stats.is_rx_assoc_norate++; 2059 return; 2060 } 2061 /* 2062 * Do HT rate set handling and setup HT node state. 2063 */ 2064 ni->ni_chan = vap->iv_bss->ni_chan; 2065 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2066 rate = ieee80211_setup_htrates(ni, htcap, 2067 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2068 IEEE80211_F_DOBRS); 2069 if (rate & IEEE80211_RATE_BASIC) { 2070 ratesetmismatch(ni, wh, reassoc, resp, 2071 "HT", rate); 2072 vap->iv_stats.is_ht_assoc_norate++; 2073 return; 2074 } 2075 ieee80211_ht_node_init(ni); 2076 ieee80211_ht_updatehtcap(ni, htcap); 2077 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2078 ieee80211_ht_node_cleanup(ni); 2079 #ifdef IEEE80211_SUPPORT_SUPERG 2080 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2081 ieee80211_ff_node_cleanup(ni); 2082 #endif 2083 /* 2084 * Allow AMPDU operation only with unencrypted traffic 2085 * or AES-CCM; the 11n spec only specifies these ciphers 2086 * so permitting any others is undefined and can lead 2087 * to interoperability problems. 2088 */ 2089 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2090 (((vap->iv_flags & IEEE80211_F_WPA) && 2091 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2092 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2093 IEEE80211_NOTE(vap, 2094 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2095 "disallow HT use because WEP or TKIP requested, " 2096 "capinfo 0x%x ucastcipher %d", capinfo, 2097 rsnparms.rsn_ucastcipher); 2098 ieee80211_ht_node_cleanup(ni); 2099 vap->iv_stats.is_ht_assoc_downgrade++; 2100 } 2101 /* 2102 * If constrained to 11n-only stations reject legacy stations. 2103 */ 2104 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2105 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2106 htcapmismatch(ni, wh, reassoc, resp); 2107 vap->iv_stats.is_ht_assoc_nohtcap++; 2108 return; 2109 } 2110 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2111 ni->ni_noise = nf; 2112 ni->ni_intval = lintval; 2113 ni->ni_capinfo = capinfo; 2114 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2115 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2116 /* 2117 * Store the IEs. 2118 * XXX maybe better to just expand 2119 */ 2120 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2121 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2122 if (wpa != NULL) 2123 setie(wpa_ie, wpa - sfrm); 2124 if (rsn != NULL) 2125 setie(rsn_ie, rsn - sfrm); 2126 if (htcap != NULL) 2127 setie(htcap_ie, htcap - sfrm); 2128 if (wme != NULL) { 2129 setie(wme_ie, wme - sfrm); 2130 /* 2131 * Mark node as capable of QoS. 2132 */ 2133 ni->ni_flags |= IEEE80211_NODE_QOS; 2134 } else 2135 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2136 #ifdef IEEE80211_SUPPORT_SUPERG 2137 if (ath != NULL) { 2138 setie(ath_ie, ath - sfrm); 2139 /* 2140 * Parse ATH station parameters. 2141 */ 2142 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2143 } else 2144 #endif 2145 ni->ni_ath_flags = 0; 2146 #undef setie 2147 } else { 2148 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2149 ni->ni_ath_flags = 0; 2150 } 2151 ieee80211_node_join(ni, resp); 2152 ieee80211_deliver_l2uf(ni); 2153 break; 2154 } 2155 2156 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2157 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2158 uint16_t reason; 2159 2160 if (vap->iv_state != IEEE80211_S_RUN || 2161 /* NB: can happen when in promiscuous mode */ 2162 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2163 vap->iv_stats.is_rx_mgtdiscard++; 2164 break; 2165 } 2166 /* 2167 * deauth/disassoc frame format 2168 * [2] reason 2169 */ 2170 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2171 reason = le16toh(*(uint16_t *)frm); 2172 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2173 vap->iv_stats.is_rx_deauth++; 2174 IEEE80211_NODE_STAT(ni, rx_deauth); 2175 } else { 2176 vap->iv_stats.is_rx_disassoc++; 2177 IEEE80211_NODE_STAT(ni, rx_disassoc); 2178 } 2179 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2180 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2181 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2182 if (ni != vap->iv_bss) 2183 ieee80211_node_leave(ni); 2184 break; 2185 } 2186 2187 case IEEE80211_FC0_SUBTYPE_ACTION: 2188 if (vap->iv_state == IEEE80211_S_RUN) { 2189 if (ieee80211_parse_action(ni, m0) == 0) 2190 ic->ic_recv_action(ni, wh, frm, efrm); 2191 } else 2192 vap->iv_stats.is_rx_mgtdiscard++; 2193 break; 2194 2195 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2196 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2197 default: 2198 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2199 wh, "mgt", "subtype 0x%x not handled", subtype); 2200 vap->iv_stats.is_rx_badsubtype++; 2201 break; 2202 } 2203 } 2204 2205 static void 2206 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2207 { 2208 switch (subtype) { 2209 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2210 hostap_recv_pspoll(ni, m); 2211 break; 2212 case IEEE80211_FC0_SUBTYPE_BAR: 2213 ieee80211_recv_bar(ni, m); 2214 break; 2215 } 2216 } 2217 2218 /* 2219 * Process a received ps-poll frame. 2220 */ 2221 static void 2222 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2223 { 2224 struct ieee80211vap *vap = ni->ni_vap; 2225 struct ieee80211_frame_min *wh; 2226 struct ifnet *ifp; 2227 struct mbuf *m; 2228 uint16_t aid; 2229 int qlen; 2230 2231 wh = mtod(m0, struct ieee80211_frame_min *); 2232 if (ni->ni_associd == 0) { 2233 IEEE80211_DISCARD(vap, 2234 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2235 (struct ieee80211_frame *) wh, NULL, 2236 "%s", "unassociated station"); 2237 vap->iv_stats.is_ps_unassoc++; 2238 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2239 IEEE80211_REASON_NOT_ASSOCED); 2240 return; 2241 } 2242 2243 aid = le16toh(*(uint16_t *)wh->i_dur); 2244 if (aid != ni->ni_associd) { 2245 IEEE80211_DISCARD(vap, 2246 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2247 (struct ieee80211_frame *) wh, NULL, 2248 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2249 ni->ni_associd, aid); 2250 vap->iv_stats.is_ps_badaid++; 2251 /* 2252 * NB: We used to deauth the station but it turns out 2253 * the Blackberry Curve 8230 (and perhaps other devices) 2254 * sometimes send the wrong AID when WME is negotiated. 2255 * Being more lenient here seems ok as we already check 2256 * the station is associated and we only return frames 2257 * queued for the station (i.e. we don't use the AID). 2258 */ 2259 return; 2260 } 2261 2262 /* Okay, take the first queued packet and put it out... */ 2263 m = ieee80211_node_psq_dequeue(ni, &qlen); 2264 if (m == NULL) { 2265 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2266 "%s", "recv ps-poll, but queue empty"); 2267 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2268 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2269 if (vap->iv_set_tim != NULL) 2270 vap->iv_set_tim(ni, 0); /* just in case */ 2271 return; 2272 } 2273 /* 2274 * If there are more packets, set the more packets bit 2275 * in the packet dispatched to the station; otherwise 2276 * turn off the TIM bit. 2277 */ 2278 if (qlen != 0) { 2279 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2280 "recv ps-poll, send packet, %u still queued", qlen); 2281 m->m_flags |= M_MORE_DATA; 2282 } else { 2283 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2284 "%s", "recv ps-poll, send packet, queue empty"); 2285 if (vap->iv_set_tim != NULL) 2286 vap->iv_set_tim(ni, 0); 2287 } 2288 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2289 2290 if (m->m_flags & M_ENCAP) 2291 ifp = vap->iv_ic->ic_ifp; 2292 else 2293 ifp = vap->iv_ifp; 2294 IF_ENQUEUE(&ifp->if_snd, m); 2295 ifp->if_start(ifp); 2296 } 2297