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/ifq_var.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 char ethstr[ETHER_ADDRSTRLEN + 1]; 160 161 ostate = vap->iv_state; 162 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 163 __func__, ieee80211_state_name[ostate], 164 ieee80211_state_name[nstate], arg); 165 vap->iv_state = nstate; /* state transition */ 166 if (ostate != IEEE80211_S_SCAN) 167 ieee80211_cancel_scan(vap); /* background scan */ 168 switch (nstate) { 169 case IEEE80211_S_INIT: 170 switch (ostate) { 171 case IEEE80211_S_SCAN: 172 ieee80211_cancel_scan(vap); 173 break; 174 case IEEE80211_S_CAC: 175 ieee80211_dfs_cac_stop(vap); 176 break; 177 case IEEE80211_S_RUN: 178 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 179 break; 180 default: 181 break; 182 } 183 if (ostate != IEEE80211_S_INIT) { 184 /* NB: optimize INIT -> INIT case */ 185 ieee80211_reset_bss(vap); 186 } 187 if (vap->iv_auth->ia_detach != NULL) 188 vap->iv_auth->ia_detach(vap); 189 break; 190 case IEEE80211_S_SCAN: 191 switch (ostate) { 192 case IEEE80211_S_CSA: 193 case IEEE80211_S_RUN: 194 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 195 /* 196 * Clear overlapping BSS state; the beacon frame 197 * will be reconstructed on transition to the RUN 198 * state and the timeout routines check if the flag 199 * is set before doing anything so this is sufficient. 200 */ 201 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 202 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 203 /* fall thru... */ 204 case IEEE80211_S_CAC: 205 /* 206 * NB: We may get here because of a manual channel 207 * change in which case we need to stop CAC 208 * XXX no need to stop if ostate RUN but it's ok 209 */ 210 ieee80211_dfs_cac_stop(vap); 211 /* fall thru... */ 212 case IEEE80211_S_INIT: 213 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 214 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 215 /* 216 * Already have a channel; bypass the 217 * scan and startup immediately. 218 * ieee80211_create_ibss will call back to 219 * move us to RUN state. 220 */ 221 ieee80211_create_ibss(vap, vap->iv_des_chan); 222 break; 223 } 224 /* 225 * Initiate a scan. We can come here as a result 226 * of an IEEE80211_IOC_SCAN_REQ too in which case 227 * the vap will be marked with IEEE80211_FEXT_SCANREQ 228 * and the scan request parameters will be present 229 * in iv_scanreq. Otherwise we do the default. 230 */ 231 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 232 ieee80211_check_scan(vap, 233 vap->iv_scanreq_flags, 234 vap->iv_scanreq_duration, 235 vap->iv_scanreq_mindwell, 236 vap->iv_scanreq_maxdwell, 237 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 238 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 239 } else 240 ieee80211_check_scan_current(vap); 241 break; 242 case IEEE80211_S_SCAN: 243 /* 244 * A state change requires a reset; scan. 245 */ 246 ieee80211_check_scan_current(vap); 247 break; 248 default: 249 break; 250 } 251 break; 252 case IEEE80211_S_CAC: 253 /* 254 * Start CAC on a DFS channel. We come here when starting 255 * a bss on a DFS channel (see ieee80211_create_ibss). 256 */ 257 ieee80211_dfs_cac_start(vap); 258 break; 259 case IEEE80211_S_RUN: 260 if (vap->iv_flags & IEEE80211_F_WPA) { 261 /* XXX validate prerequisites */ 262 } 263 switch (ostate) { 264 case IEEE80211_S_INIT: 265 /* 266 * Already have a channel; bypass the 267 * scan and startup immediately. 268 * Note that ieee80211_create_ibss will call 269 * back to do a RUN->RUN state change. 270 */ 271 ieee80211_create_ibss(vap, 272 ieee80211_ht_adjust_channel(ic, 273 ic->ic_curchan, vap->iv_flags_ht)); 274 /* NB: iv_bss is changed on return */ 275 break; 276 case IEEE80211_S_CAC: 277 /* 278 * NB: This is the normal state change when CAC 279 * expires and no radar was detected; no need to 280 * clear the CAC timer as it's already expired. 281 */ 282 /* fall thru... */ 283 case IEEE80211_S_CSA: 284 /* 285 * Shorten inactivity timer of associated stations 286 * to weed out sta's that don't follow a CSA. 287 */ 288 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 289 /* 290 * Update bss node channel to reflect where 291 * we landed after CSA. 292 */ 293 ieee80211_node_set_chan(vap->iv_bss, 294 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 295 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 296 /* XXX bypass debug msgs */ 297 break; 298 case IEEE80211_S_SCAN: 299 case IEEE80211_S_RUN: 300 #ifdef IEEE80211_DEBUG 301 if (ieee80211_msg_debug(vap)) { 302 struct ieee80211_node *ni = vap->iv_bss; 303 ieee80211_note(vap, 304 "synchronized with %s ssid ", 305 kether_ntoa(ni->ni_bssid, ethstr)); 306 ieee80211_print_essid(ni->ni_essid, 307 ni->ni_esslen); 308 /* XXX MCS/HT */ 309 kprintf(" channel %d start %uMb\n", 310 ieee80211_chan2ieee(ic, ic->ic_curchan), 311 IEEE80211_RATE2MBS(ni->ni_txrate)); 312 } 313 #endif 314 break; 315 default: 316 break; 317 } 318 /* 319 * Start/stop the authenticator. We delay until here 320 * to allow configuration to happen out of order. 321 */ 322 if (vap->iv_auth->ia_attach != NULL) { 323 /* XXX check failure */ 324 vap->iv_auth->ia_attach(vap); 325 } else if (vap->iv_auth->ia_detach != NULL) { 326 vap->iv_auth->ia_detach(vap); 327 } 328 ieee80211_node_authorize(vap->iv_bss); 329 break; 330 case IEEE80211_S_CSA: 331 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 332 /* 333 * On a ``band change'' silently drop associated 334 * stations as they must re-associate before they 335 * can pass traffic (as otherwise protocol state 336 * such as capabilities and the negotiated rate 337 * set may/will be wrong). 338 */ 339 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 340 } 341 break; 342 default: 343 break; 344 } 345 return 0; 346 } 347 348 static void 349 hostap_deliver_data(struct ieee80211vap *vap, 350 struct ieee80211_node *ni, struct mbuf *m) 351 { 352 struct ether_header *eh = mtod(m, struct ether_header *); 353 struct ifnet *ifp = vap->iv_ifp; 354 355 /* clear driver/net80211 flags before passing up */ 356 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 357 358 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 359 ("gack, opmode %d", vap->iv_opmode)); 360 /* 361 * Do accounting. 362 */ 363 ifp->if_ipackets++; 364 IEEE80211_NODE_STAT(ni, rx_data); 365 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 366 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 367 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 368 IEEE80211_NODE_STAT(ni, rx_mcast); 369 } else 370 IEEE80211_NODE_STAT(ni, rx_ucast); 371 372 /* perform as a bridge within the AP */ 373 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 374 struct mbuf *mcopy = NULL; 375 376 if (m->m_flags & M_MCAST) { 377 mcopy = m_dup(m, MB_DONTWAIT); 378 if (mcopy == NULL) 379 ifp->if_oerrors++; 380 else 381 mcopy->m_flags |= M_MCAST; 382 } else { 383 /* 384 * Check if the destination is associated with the 385 * same vap and authorized to receive traffic. 386 * Beware of traffic destined for the vap itself; 387 * sending it will not work; just let it be delivered 388 * normally. 389 */ 390 struct ieee80211_node *sta = ieee80211_find_vap_node( 391 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 392 if (sta != NULL) { 393 if (ieee80211_node_is_authorized(sta)) { 394 /* 395 * Beware of sending to ourself; this 396 * needs to happen via the normal 397 * input path. 398 */ 399 if (sta != vap->iv_bss) { 400 mcopy = m; 401 m = NULL; 402 } 403 } else { 404 vap->iv_stats.is_rx_unauth++; 405 IEEE80211_NODE_STAT(sta, rx_unauth); 406 } 407 ieee80211_free_node(sta); 408 } 409 } 410 if (mcopy != NULL) { 411 int err; 412 err = ieee80211_handoff(ifp, mcopy); 413 if (err) { 414 /* NB: IFQ_HANDOFF reclaims mcopy */ 415 } else { 416 ifp->if_opackets++; 417 } 418 } 419 } 420 if (m != NULL) { 421 /* 422 * Mark frame as coming from vap's interface. 423 */ 424 m->m_pkthdr.rcvif = ifp; 425 if (m->m_flags & M_MCAST) { 426 /* 427 * Spam DWDS vap's w/ multicast traffic. 428 */ 429 /* XXX only if dwds in use? */ 430 ieee80211_dwds_mcast(vap, m); 431 } 432 if (ni->ni_vlan != 0) { 433 /* attach vlan tag */ 434 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 435 m->m_flags |= M_VLANTAG; 436 } 437 ifp->if_input(ifp, m); 438 } 439 } 440 441 /* 442 * Decide if a received management frame should be 443 * printed when debugging is enabled. This filters some 444 * of the less interesting frames that come frequently 445 * (e.g. beacons). 446 */ 447 static __inline int 448 doprint(struct ieee80211vap *vap, int subtype) 449 { 450 switch (subtype) { 451 case IEEE80211_FC0_SUBTYPE_BEACON: 452 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 453 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 454 return 0; 455 } 456 return 1; 457 } 458 459 /* 460 * Process a received frame. The node associated with the sender 461 * should be supplied. If nothing was found in the node table then 462 * the caller is assumed to supply a reference to iv_bss instead. 463 * The RSSI and a timestamp are also supplied. The RSSI data is used 464 * during AP scanning to select a AP to associate with; it can have 465 * any units so long as values have consistent units and higher values 466 * mean ``better signal''. The receive timestamp is currently not used 467 * by the 802.11 layer. 468 */ 469 static int 470 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 471 { 472 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 473 #define HAS_SEQ(type) ((type & 0x4) == 0) 474 struct ieee80211vap *vap = ni->ni_vap; 475 struct ieee80211com *ic = ni->ni_ic; 476 struct ifnet *ifp = vap->iv_ifp; 477 struct ieee80211_frame *wh; 478 struct ieee80211_key *key; 479 struct ether_header *eh; 480 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 481 uint8_t dir, type, subtype, qos; 482 uint8_t *bssid; 483 uint16_t rxseq; 484 char ethstr[ETHER_ADDRSTRLEN + 1]; 485 486 if (m->m_flags & M_AMPDU_MPDU) { 487 /* 488 * Fastpath for A-MPDU reorder q resubmission. Frames 489 * w/ M_AMPDU_MPDU marked have already passed through 490 * here but were received out of order and been held on 491 * the reorder queue. When resubmitted they are marked 492 * with the M_AMPDU_MPDU flag and we can bypass most of 493 * the normal processing. 494 */ 495 wh = mtod(m, struct ieee80211_frame *); 496 type = IEEE80211_FC0_TYPE_DATA; 497 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 498 subtype = IEEE80211_FC0_SUBTYPE_QOS; 499 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 500 goto resubmit_ampdu; 501 } 502 503 KASSERT(ni != NULL, ("null node")); 504 ni->ni_inact = ni->ni_inact_reload; 505 506 type = -1; /* undefined */ 507 508 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 509 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 510 ni->ni_macaddr, NULL, 511 "too short (1): len %u", m->m_pkthdr.len); 512 vap->iv_stats.is_rx_tooshort++; 513 goto out; 514 } 515 /* 516 * Bit of a cheat here, we use a pointer for a 3-address 517 * frame format but don't reference fields past outside 518 * ieee80211_frame_min w/o first validating the data is 519 * present. 520 */ 521 wh = mtod(m, struct ieee80211_frame *); 522 523 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 524 IEEE80211_FC0_VERSION_0) { 525 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 526 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 527 wh->i_fc[0], wh->i_fc[1]); 528 vap->iv_stats.is_rx_badversion++; 529 goto err; 530 } 531 532 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 533 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 534 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 535 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 536 if (dir != IEEE80211_FC1_DIR_NODS) 537 bssid = wh->i_addr1; 538 else if (type == IEEE80211_FC0_TYPE_CTL) 539 bssid = wh->i_addr1; 540 else { 541 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 542 IEEE80211_DISCARD_MAC(vap, 543 IEEE80211_MSG_ANY, ni->ni_macaddr, 544 NULL, "too short (2): len %u", 545 m->m_pkthdr.len); 546 vap->iv_stats.is_rx_tooshort++; 547 goto out; 548 } 549 bssid = wh->i_addr3; 550 } 551 /* 552 * Validate the bssid. 553 */ 554 if (!(type == IEEE80211_FC0_TYPE_MGT && 555 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 556 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 557 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 558 /* not interested in */ 559 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 560 bssid, NULL, "%s", "not to bss"); 561 vap->iv_stats.is_rx_wrongbss++; 562 goto out; 563 } 564 565 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 566 ni->ni_noise = nf; 567 if (HAS_SEQ(type)) { 568 uint8_t tid = ieee80211_gettid(wh); 569 if (IEEE80211_QOS_HAS_SEQ(wh) && 570 TID_TO_WME_AC(tid) >= WME_AC_VI) 571 ic->ic_wme.wme_hipri_traffic++; 572 rxseq = le16toh(*(uint16_t *)wh->i_seq); 573 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 574 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 575 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 576 /* duplicate, discard */ 577 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 578 bssid, "duplicate", 579 "seqno <%u,%u> fragno <%u,%u> tid %u", 580 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 581 ni->ni_rxseqs[tid] >> 582 IEEE80211_SEQ_SEQ_SHIFT, 583 rxseq & IEEE80211_SEQ_FRAG_MASK, 584 ni->ni_rxseqs[tid] & 585 IEEE80211_SEQ_FRAG_MASK, 586 tid); 587 vap->iv_stats.is_rx_dup++; 588 IEEE80211_NODE_STAT(ni, rx_dup); 589 goto out; 590 } 591 ni->ni_rxseqs[tid] = rxseq; 592 } 593 } 594 595 switch (type) { 596 case IEEE80211_FC0_TYPE_DATA: 597 hdrspace = ieee80211_hdrspace(ic, wh); 598 if (m->m_len < hdrspace && 599 (m = m_pullup(m, hdrspace)) == NULL) { 600 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 601 ni->ni_macaddr, NULL, 602 "data too short: expecting %u", hdrspace); 603 vap->iv_stats.is_rx_tooshort++; 604 goto out; /* XXX */ 605 } 606 if (!(dir == IEEE80211_FC1_DIR_TODS || 607 (dir == IEEE80211_FC1_DIR_DSTODS && 608 (vap->iv_flags & IEEE80211_F_DWDS)))) { 609 if (dir != IEEE80211_FC1_DIR_DSTODS) { 610 IEEE80211_DISCARD(vap, 611 IEEE80211_MSG_INPUT, wh, "data", 612 "incorrect dir 0x%x", dir); 613 } else { 614 IEEE80211_DISCARD(vap, 615 IEEE80211_MSG_INPUT | 616 IEEE80211_MSG_WDS, wh, 617 "4-address data", 618 "%s", "DWDS not enabled"); 619 } 620 vap->iv_stats.is_rx_wrongdir++; 621 goto out; 622 } 623 /* check if source STA is associated */ 624 if (ni == vap->iv_bss) { 625 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 626 wh, "data", "%s", "unknown src"); 627 ieee80211_send_error(ni, wh->i_addr2, 628 IEEE80211_FC0_SUBTYPE_DEAUTH, 629 IEEE80211_REASON_NOT_AUTHED); 630 vap->iv_stats.is_rx_notassoc++; 631 goto err; 632 } 633 if (ni->ni_associd == 0) { 634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 635 wh, "data", "%s", "unassoc src"); 636 IEEE80211_SEND_MGMT(ni, 637 IEEE80211_FC0_SUBTYPE_DISASSOC, 638 IEEE80211_REASON_NOT_ASSOCED); 639 vap->iv_stats.is_rx_notassoc++; 640 goto err; 641 } 642 643 /* 644 * Check for power save state change. 645 * XXX out-of-order A-MPDU frames? 646 */ 647 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 648 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 649 ieee80211_node_pwrsave(ni, 650 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 651 /* 652 * For 4-address packets handle WDS discovery 653 * notifications. Once a WDS link is setup frames 654 * are just delivered to the WDS vap (see below). 655 */ 656 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 657 if (!ieee80211_node_is_authorized(ni)) { 658 IEEE80211_DISCARD(vap, 659 IEEE80211_MSG_INPUT | 660 IEEE80211_MSG_WDS, wh, 661 "4-address data", 662 "%s", "unauthorized port"); 663 vap->iv_stats.is_rx_unauth++; 664 IEEE80211_NODE_STAT(ni, rx_unauth); 665 goto err; 666 } 667 ieee80211_dwds_discover(ni, m); 668 return type; 669 } 670 671 /* 672 * Handle A-MPDU re-ordering. If the frame is to be 673 * processed directly then ieee80211_ampdu_reorder 674 * will return 0; otherwise it has consumed the mbuf 675 * and we should do nothing more with it. 676 */ 677 if ((m->m_flags & M_AMPDU) && 678 ieee80211_ampdu_reorder(ni, m) != 0) { 679 m = NULL; 680 goto out; 681 } 682 resubmit_ampdu: 683 684 /* 685 * Handle privacy requirements. Note that we 686 * must not be preempted from here until after 687 * we (potentially) call ieee80211_crypto_demic; 688 * otherwise we may violate assumptions in the 689 * crypto cipher modules used to do delayed update 690 * of replay sequence numbers. 691 */ 692 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 693 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 694 /* 695 * Discard encrypted frames when privacy is off. 696 */ 697 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 698 wh, "WEP", "%s", "PRIVACY off"); 699 vap->iv_stats.is_rx_noprivacy++; 700 IEEE80211_NODE_STAT(ni, rx_noprivacy); 701 goto out; 702 } 703 key = ieee80211_crypto_decap(ni, m, hdrspace); 704 if (key == NULL) { 705 /* NB: stats+msgs handled in crypto_decap */ 706 IEEE80211_NODE_STAT(ni, rx_wepfail); 707 goto out; 708 } 709 wh = mtod(m, struct ieee80211_frame *); 710 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 711 } else { 712 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 713 key = NULL; 714 } 715 716 /* 717 * Save QoS bits for use below--before we strip the header. 718 */ 719 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 720 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 721 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 722 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 723 } else 724 qos = 0; 725 726 /* 727 * Next up, any fragmentation. 728 */ 729 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 730 m = ieee80211_defrag(ni, m, hdrspace); 731 if (m == NULL) { 732 /* Fragment dropped or frame not complete yet */ 733 goto out; 734 } 735 } 736 wh = NULL; /* no longer valid, catch any uses */ 737 738 /* 739 * Next strip any MSDU crypto bits. 740 */ 741 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 742 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 743 ni->ni_macaddr, "data", "%s", "demic error"); 744 vap->iv_stats.is_rx_demicfail++; 745 IEEE80211_NODE_STAT(ni, rx_demicfail); 746 goto out; 747 } 748 /* copy to listener after decrypt */ 749 if (ieee80211_radiotap_active_vap(vap)) 750 ieee80211_radiotap_rx(vap, m); 751 need_tap = 0; 752 /* 753 * Finally, strip the 802.11 header. 754 */ 755 m = ieee80211_decap(vap, m, hdrspace); 756 if (m == NULL) { 757 /* XXX mask bit to check for both */ 758 /* don't count Null data frames as errors */ 759 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 760 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 761 goto out; 762 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 763 ni->ni_macaddr, "data", "%s", "decap error"); 764 vap->iv_stats.is_rx_decap++; 765 IEEE80211_NODE_STAT(ni, rx_decap); 766 goto err; 767 } 768 eh = mtod(m, struct ether_header *); 769 if (!ieee80211_node_is_authorized(ni)) { 770 /* 771 * Deny any non-PAE frames received prior to 772 * authorization. For open/shared-key 773 * authentication the port is mark authorized 774 * after authentication completes. For 802.1x 775 * the port is not marked authorized by the 776 * authenticator until the handshake has completed. 777 */ 778 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 779 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 780 eh->ether_shost, "data", 781 "unauthorized port: ether type 0x%x len %u", 782 eh->ether_type, m->m_pkthdr.len); 783 vap->iv_stats.is_rx_unauth++; 784 IEEE80211_NODE_STAT(ni, rx_unauth); 785 goto err; 786 } 787 } else { 788 /* 789 * When denying unencrypted frames, discard 790 * any non-PAE frames received without encryption. 791 */ 792 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 793 (key == NULL && (m->m_flags & M_WEP) == 0) && 794 eh->ether_type != htons(ETHERTYPE_PAE)) { 795 /* 796 * Drop unencrypted frames. 797 */ 798 vap->iv_stats.is_rx_unencrypted++; 799 IEEE80211_NODE_STAT(ni, rx_unencrypted); 800 goto out; 801 } 802 } 803 /* XXX require HT? */ 804 if (qos & IEEE80211_QOS_AMSDU) { 805 m = ieee80211_decap_amsdu(ni, m); 806 if (m == NULL) 807 return IEEE80211_FC0_TYPE_DATA; 808 } else { 809 #ifdef IEEE80211_SUPPORT_SUPERG 810 m = ieee80211_decap_fastframe(vap, ni, m); 811 if (m == NULL) 812 return IEEE80211_FC0_TYPE_DATA; 813 #endif 814 } 815 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 816 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 817 else 818 hostap_deliver_data(vap, ni, m); 819 return IEEE80211_FC0_TYPE_DATA; 820 821 case IEEE80211_FC0_TYPE_MGT: 822 vap->iv_stats.is_rx_mgmt++; 823 IEEE80211_NODE_STAT(ni, rx_mgmt); 824 if (dir != IEEE80211_FC1_DIR_NODS) { 825 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 826 wh, "mgt", "incorrect dir 0x%x", dir); 827 vap->iv_stats.is_rx_wrongdir++; 828 goto err; 829 } 830 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 831 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 832 ni->ni_macaddr, "mgt", "too short: len %u", 833 m->m_pkthdr.len); 834 vap->iv_stats.is_rx_tooshort++; 835 goto out; 836 } 837 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 838 /* ensure return frames are unicast */ 839 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 840 wh, NULL, "source is multicast: %s", 841 kether_ntoa(wh->i_addr2, ethstr)); 842 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 843 goto out; 844 } 845 #ifdef IEEE80211_DEBUG 846 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 847 ieee80211_msg_dumppkts(vap)) { 848 if_printf(ifp, "received %s from %s rssi %d\n", 849 ieee80211_mgt_subtype_name[subtype >> 850 IEEE80211_FC0_SUBTYPE_SHIFT], 851 kether_ntoa(wh->i_addr2, ethstr), rssi); 852 } 853 #endif 854 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 855 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 856 /* 857 * Only shared key auth frames with a challenge 858 * should be encrypted, discard all others. 859 */ 860 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 861 wh, NULL, 862 "%s", "WEP set but not permitted"); 863 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 864 goto out; 865 } 866 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 867 /* 868 * Discard encrypted frames when privacy is off. 869 */ 870 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 871 wh, NULL, "%s", "WEP set but PRIVACY off"); 872 vap->iv_stats.is_rx_noprivacy++; 873 goto out; 874 } 875 hdrspace = ieee80211_hdrspace(ic, wh); 876 key = ieee80211_crypto_decap(ni, m, hdrspace); 877 if (key == NULL) { 878 /* NB: stats+msgs handled in crypto_decap */ 879 goto out; 880 } 881 wh = mtod(m, struct ieee80211_frame *); 882 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 883 } 884 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 885 goto out; 886 887 case IEEE80211_FC0_TYPE_CTL: 888 vap->iv_stats.is_rx_ctl++; 889 IEEE80211_NODE_STAT(ni, rx_ctrl); 890 vap->iv_recv_ctl(ni, m, subtype); 891 goto out; 892 default: 893 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 894 wh, "bad", "frame type 0x%x", type); 895 /* should not come here */ 896 break; 897 } 898 err: 899 ifp->if_ierrors++; 900 out: 901 if (m != NULL) { 902 if (need_tap && ieee80211_radiotap_active_vap(vap)) 903 ieee80211_radiotap_rx(vap, m); 904 m_freem(m); 905 } 906 return type; 907 #undef SEQ_LEQ 908 } 909 910 static void 911 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 912 int rssi, int nf, uint16_t seq, uint16_t status) 913 { 914 struct ieee80211vap *vap = ni->ni_vap; 915 916 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 917 918 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 919 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 920 ni->ni_macaddr, "open auth", 921 "bad sta auth mode %u", ni->ni_authmode); 922 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 923 /* 924 * Clear any challenge text that may be there if 925 * a previous shared key auth failed and then an 926 * open auth is attempted. 927 */ 928 if (ni->ni_challenge != NULL) { 929 kfree(ni->ni_challenge, M_80211_NODE); 930 ni->ni_challenge = NULL; 931 } 932 /* XXX hack to workaround calling convention */ 933 ieee80211_send_error(ni, wh->i_addr2, 934 IEEE80211_FC0_SUBTYPE_AUTH, 935 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 936 return; 937 } 938 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 939 vap->iv_stats.is_rx_bad_auth++; 940 return; 941 } 942 /* always accept open authentication requests */ 943 if (ni == vap->iv_bss) { 944 ni = ieee80211_dup_bss(vap, wh->i_addr2); 945 if (ni == NULL) 946 return; 947 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 948 (void) ieee80211_ref_node(ni); 949 /* 950 * Mark the node as referenced to reflect that it's 951 * reference count has been bumped to insure it remains 952 * after the transaction completes. 953 */ 954 ni->ni_flags |= IEEE80211_NODE_AREF; 955 /* 956 * Mark the node as requiring a valid association id 957 * before outbound traffic is permitted. 958 */ 959 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 960 961 if (vap->iv_acl != NULL && 962 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 963 /* 964 * When the ACL policy is set to RADIUS we defer the 965 * authorization to a user agent. Dispatch an event, 966 * a subsequent MLME call will decide the fate of the 967 * station. If the user agent is not present then the 968 * node will be reclaimed due to inactivity. 969 */ 970 IEEE80211_NOTE_MAC(vap, 971 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 972 "%s", "station authentication defered (radius acl)"); 973 ieee80211_notify_node_auth(ni); 974 } else { 975 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 976 IEEE80211_NOTE_MAC(vap, 977 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 978 "%s", "station authenticated (open)"); 979 /* 980 * When 802.1x is not in use mark the port 981 * authorized at this point so traffic can flow. 982 */ 983 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 984 ieee80211_node_authorize(ni); 985 } 986 } 987 988 static void 989 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 990 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 991 uint16_t seq, uint16_t status) 992 { 993 struct ieee80211vap *vap = ni->ni_vap; 994 uint8_t *challenge; 995 int allocbs, estatus; 996 997 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 998 999 /* 1000 * NB: this can happen as we allow pre-shared key 1001 * authentication to be enabled w/o wep being turned 1002 * on so that configuration of these can be done 1003 * in any order. It may be better to enforce the 1004 * ordering in which case this check would just be 1005 * for sanity/consistency. 1006 */ 1007 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1008 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1009 ni->ni_macaddr, "shared key auth", 1010 "%s", " PRIVACY is disabled"); 1011 estatus = IEEE80211_STATUS_ALG; 1012 goto bad; 1013 } 1014 /* 1015 * Pre-shared key authentication is evil; accept 1016 * it only if explicitly configured (it is supported 1017 * mainly for compatibility with clients like Mac OS X). 1018 */ 1019 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1020 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1021 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1022 ni->ni_macaddr, "shared key auth", 1023 "bad sta auth mode %u", ni->ni_authmode); 1024 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1025 estatus = IEEE80211_STATUS_ALG; 1026 goto bad; 1027 } 1028 1029 challenge = NULL; 1030 if (frm + 1 < efrm) { 1031 if ((frm[1] + 2) > (efrm - frm)) { 1032 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1033 ni->ni_macaddr, "shared key auth", 1034 "ie %d/%d too long", 1035 frm[0], (int)((frm[1] + 2) - (efrm - frm))); 1036 vap->iv_stats.is_rx_bad_auth++; 1037 estatus = IEEE80211_STATUS_CHALLENGE; 1038 goto bad; 1039 } 1040 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1041 challenge = frm; 1042 frm += frm[1] + 2; 1043 } 1044 switch (seq) { 1045 case IEEE80211_AUTH_SHARED_CHALLENGE: 1046 case IEEE80211_AUTH_SHARED_RESPONSE: 1047 if (challenge == NULL) { 1048 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1049 ni->ni_macaddr, "shared key auth", 1050 "%s", "no challenge"); 1051 vap->iv_stats.is_rx_bad_auth++; 1052 estatus = IEEE80211_STATUS_CHALLENGE; 1053 goto bad; 1054 } 1055 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1056 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1057 ni->ni_macaddr, "shared key auth", 1058 "bad challenge len %d", challenge[1]); 1059 vap->iv_stats.is_rx_bad_auth++; 1060 estatus = IEEE80211_STATUS_CHALLENGE; 1061 goto bad; 1062 } 1063 default: 1064 break; 1065 } 1066 switch (seq) { 1067 case IEEE80211_AUTH_SHARED_REQUEST: 1068 if (ni == vap->iv_bss) { 1069 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1070 if (ni == NULL) { 1071 /* NB: no way to return an error */ 1072 return; 1073 } 1074 allocbs = 1; 1075 } else { 1076 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1077 (void) ieee80211_ref_node(ni); 1078 allocbs = 0; 1079 } 1080 /* 1081 * Mark the node as referenced to reflect that it's 1082 * reference count has been bumped to insure it remains 1083 * after the transaction completes. 1084 */ 1085 ni->ni_flags |= IEEE80211_NODE_AREF; 1086 /* 1087 * Mark the node as requiring a valid associatio id 1088 * before outbound traffic is permitted. 1089 */ 1090 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1091 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1092 ni->ni_noise = nf; 1093 if (!ieee80211_alloc_challenge(ni)) { 1094 /* NB: don't return error so they rexmit */ 1095 return; 1096 } 1097 get_random_bytes(ni->ni_challenge, 1098 IEEE80211_CHALLENGE_LEN); 1099 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1100 ni, "shared key %sauth request", allocbs ? "" : "re"); 1101 /* 1102 * When the ACL policy is set to RADIUS we defer the 1103 * authorization to a user agent. Dispatch an event, 1104 * a subsequent MLME call will decide the fate of the 1105 * station. If the user agent is not present then the 1106 * node will be reclaimed due to inactivity. 1107 */ 1108 if (vap->iv_acl != NULL && 1109 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1110 IEEE80211_NOTE_MAC(vap, 1111 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1112 ni->ni_macaddr, 1113 "%s", "station authentication defered (radius acl)"); 1114 ieee80211_notify_node_auth(ni); 1115 return; 1116 } 1117 break; 1118 case IEEE80211_AUTH_SHARED_RESPONSE: 1119 if (ni == vap->iv_bss) { 1120 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1121 ni->ni_macaddr, "shared key response", 1122 "%s", "unknown station"); 1123 /* NB: don't send a response */ 1124 return; 1125 } 1126 if (ni->ni_challenge == NULL) { 1127 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1128 ni->ni_macaddr, "shared key response", 1129 "%s", "no challenge recorded"); 1130 vap->iv_stats.is_rx_bad_auth++; 1131 estatus = IEEE80211_STATUS_CHALLENGE; 1132 goto bad; 1133 } 1134 if (memcmp(ni->ni_challenge, &challenge[2], 1135 challenge[1]) != 0) { 1136 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1137 ni->ni_macaddr, "shared key response", 1138 "%s", "challenge mismatch"); 1139 vap->iv_stats.is_rx_auth_fail++; 1140 estatus = IEEE80211_STATUS_CHALLENGE; 1141 goto bad; 1142 } 1143 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1144 ni, "%s", "station authenticated (shared key)"); 1145 ieee80211_node_authorize(ni); 1146 break; 1147 default: 1148 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1149 ni->ni_macaddr, "shared key auth", 1150 "bad seq %d", seq); 1151 vap->iv_stats.is_rx_bad_auth++; 1152 estatus = IEEE80211_STATUS_SEQUENCE; 1153 goto bad; 1154 } 1155 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1156 return; 1157 bad: 1158 /* 1159 * Send an error response; but only when operating as an AP. 1160 */ 1161 /* XXX hack to workaround calling convention */ 1162 ieee80211_send_error(ni, wh->i_addr2, 1163 IEEE80211_FC0_SUBTYPE_AUTH, 1164 (seq + 1) | (estatus<<16)); 1165 } 1166 1167 /* 1168 * Convert a WPA cipher selector OUI to an internal 1169 * cipher algorithm. Where appropriate we also 1170 * record any key length. 1171 */ 1172 static int 1173 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1174 { 1175 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1176 uint32_t w = LE_READ_4(sel); 1177 1178 switch (w) { 1179 case WPA_SEL(WPA_CSE_NULL): 1180 return IEEE80211_CIPHER_NONE; 1181 case WPA_SEL(WPA_CSE_WEP40): 1182 if (keylen) 1183 *keylen = 40 / NBBY; 1184 return IEEE80211_CIPHER_WEP; 1185 case WPA_SEL(WPA_CSE_WEP104): 1186 if (keylen) 1187 *keylen = 104 / NBBY; 1188 return IEEE80211_CIPHER_WEP; 1189 case WPA_SEL(WPA_CSE_TKIP): 1190 return IEEE80211_CIPHER_TKIP; 1191 case WPA_SEL(WPA_CSE_CCMP): 1192 return IEEE80211_CIPHER_AES_CCM; 1193 } 1194 return 32; /* NB: so 1<< is discarded */ 1195 #undef WPA_SEL 1196 } 1197 1198 /* 1199 * Convert a WPA key management/authentication algorithm 1200 * to an internal code. 1201 */ 1202 static int 1203 wpa_keymgmt(const uint8_t *sel) 1204 { 1205 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1206 uint32_t w = LE_READ_4(sel); 1207 1208 switch (w) { 1209 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1210 return WPA_ASE_8021X_UNSPEC; 1211 case WPA_SEL(WPA_ASE_8021X_PSK): 1212 return WPA_ASE_8021X_PSK; 1213 case WPA_SEL(WPA_ASE_NONE): 1214 return WPA_ASE_NONE; 1215 } 1216 return 0; /* NB: so is discarded */ 1217 #undef WPA_SEL 1218 } 1219 1220 /* 1221 * Parse a WPA information element to collect parameters. 1222 * Note that we do not validate security parameters; that 1223 * is handled by the authenticator; the parsing done here 1224 * is just for internal use in making operational decisions. 1225 */ 1226 static int 1227 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1228 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1229 { 1230 uint8_t len = frm[1]; 1231 uint32_t w; 1232 int n; 1233 1234 /* 1235 * Check the length once for fixed parts: OUI, type, 1236 * version, mcast cipher, and 2 selector counts. 1237 * Other, variable-length data, must be checked separately. 1238 */ 1239 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1240 IEEE80211_DISCARD_IE(vap, 1241 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1242 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1243 return IEEE80211_REASON_IE_INVALID; 1244 } 1245 if (len < 14) { 1246 IEEE80211_DISCARD_IE(vap, 1247 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1248 wh, "WPA", "too short, len %u", len); 1249 return IEEE80211_REASON_IE_INVALID; 1250 } 1251 frm += 6, len -= 4; /* NB: len is payload only */ 1252 /* NB: iswpaoui already validated the OUI and type */ 1253 w = LE_READ_2(frm); 1254 if (w != WPA_VERSION) { 1255 IEEE80211_DISCARD_IE(vap, 1256 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1257 wh, "WPA", "bad version %u", w); 1258 return IEEE80211_REASON_IE_INVALID; 1259 } 1260 frm += 2, len -= 2; 1261 1262 memset(rsn, 0, sizeof(*rsn)); 1263 1264 /* multicast/group cipher */ 1265 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1266 frm += 4, len -= 4; 1267 1268 /* unicast ciphers */ 1269 n = LE_READ_2(frm); 1270 frm += 2, len -= 2; 1271 if (len < n*4+2) { 1272 IEEE80211_DISCARD_IE(vap, 1273 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1274 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1275 len, n); 1276 return IEEE80211_REASON_IE_INVALID; 1277 } 1278 w = 0; 1279 for (; n > 0; n--) { 1280 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1281 frm += 4, len -= 4; 1282 } 1283 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1284 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1285 else 1286 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1287 1288 /* key management algorithms */ 1289 n = LE_READ_2(frm); 1290 frm += 2, len -= 2; 1291 if (len < n*4) { 1292 IEEE80211_DISCARD_IE(vap, 1293 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1294 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1295 len, n); 1296 return IEEE80211_REASON_IE_INVALID; 1297 } 1298 w = 0; 1299 for (; n > 0; n--) { 1300 w |= wpa_keymgmt(frm); 1301 frm += 4, len -= 4; 1302 } 1303 if (w & WPA_ASE_8021X_UNSPEC) 1304 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1305 else 1306 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1307 1308 if (len > 2) /* optional capabilities */ 1309 rsn->rsn_caps = LE_READ_2(frm); 1310 1311 return 0; 1312 } 1313 1314 /* 1315 * Convert an RSN cipher selector OUI to an internal 1316 * cipher algorithm. Where appropriate we also 1317 * record any key length. 1318 */ 1319 static int 1320 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1321 { 1322 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1323 uint32_t w = LE_READ_4(sel); 1324 1325 switch (w) { 1326 case RSN_SEL(RSN_CSE_NULL): 1327 return IEEE80211_CIPHER_NONE; 1328 case RSN_SEL(RSN_CSE_WEP40): 1329 if (keylen) 1330 *keylen = 40 / NBBY; 1331 return IEEE80211_CIPHER_WEP; 1332 case RSN_SEL(RSN_CSE_WEP104): 1333 if (keylen) 1334 *keylen = 104 / NBBY; 1335 return IEEE80211_CIPHER_WEP; 1336 case RSN_SEL(RSN_CSE_TKIP): 1337 return IEEE80211_CIPHER_TKIP; 1338 case RSN_SEL(RSN_CSE_CCMP): 1339 return IEEE80211_CIPHER_AES_CCM; 1340 case RSN_SEL(RSN_CSE_WRAP): 1341 return IEEE80211_CIPHER_AES_OCB; 1342 } 1343 return 32; /* NB: so 1<< is discarded */ 1344 #undef WPA_SEL 1345 } 1346 1347 /* 1348 * Convert an RSN key management/authentication algorithm 1349 * to an internal code. 1350 */ 1351 static int 1352 rsn_keymgmt(const uint8_t *sel) 1353 { 1354 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1355 uint32_t w = LE_READ_4(sel); 1356 1357 switch (w) { 1358 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1359 return RSN_ASE_8021X_UNSPEC; 1360 case RSN_SEL(RSN_ASE_8021X_PSK): 1361 return RSN_ASE_8021X_PSK; 1362 case RSN_SEL(RSN_ASE_NONE): 1363 return RSN_ASE_NONE; 1364 } 1365 return 0; /* NB: so is discarded */ 1366 #undef RSN_SEL 1367 } 1368 1369 /* 1370 * Parse a WPA/RSN information element to collect parameters 1371 * and validate the parameters against what has been 1372 * configured for the system. 1373 */ 1374 static int 1375 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1376 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1377 { 1378 uint8_t len = frm[1]; 1379 uint32_t w; 1380 int n; 1381 1382 /* 1383 * Check the length once for fixed parts: 1384 * version, mcast cipher, and 2 selector counts. 1385 * Other, variable-length data, must be checked separately. 1386 */ 1387 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1388 IEEE80211_DISCARD_IE(vap, 1389 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1390 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1391 return IEEE80211_REASON_IE_INVALID; 1392 } 1393 if (len < 10) { 1394 IEEE80211_DISCARD_IE(vap, 1395 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1396 wh, "RSN", "too short, len %u", len); 1397 return IEEE80211_REASON_IE_INVALID; 1398 } 1399 frm += 2; 1400 w = LE_READ_2(frm); 1401 if (w != RSN_VERSION) { 1402 IEEE80211_DISCARD_IE(vap, 1403 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1404 wh, "RSN", "bad version %u", w); 1405 return IEEE80211_REASON_IE_INVALID; 1406 } 1407 frm += 2, len -= 2; 1408 1409 memset(rsn, 0, sizeof(*rsn)); 1410 1411 /* multicast/group cipher */ 1412 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1413 frm += 4, len -= 4; 1414 1415 /* unicast ciphers */ 1416 n = LE_READ_2(frm); 1417 frm += 2, len -= 2; 1418 if (len < n*4+2) { 1419 IEEE80211_DISCARD_IE(vap, 1420 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1421 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1422 len, n); 1423 return IEEE80211_REASON_IE_INVALID; 1424 } 1425 w = 0; 1426 for (; n > 0; n--) { 1427 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1428 frm += 4, len -= 4; 1429 } 1430 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1431 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1432 else 1433 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1434 1435 /* key management algorithms */ 1436 n = LE_READ_2(frm); 1437 frm += 2, len -= 2; 1438 if (len < n*4) { 1439 IEEE80211_DISCARD_IE(vap, 1440 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1441 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1442 len, n); 1443 return IEEE80211_REASON_IE_INVALID; 1444 } 1445 w = 0; 1446 for (; n > 0; n--) { 1447 w |= rsn_keymgmt(frm); 1448 frm += 4, len -= 4; 1449 } 1450 if (w & RSN_ASE_8021X_UNSPEC) 1451 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1452 else 1453 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1454 1455 /* optional RSN capabilities */ 1456 if (len > 2) 1457 rsn->rsn_caps = LE_READ_2(frm); 1458 /* XXXPMKID */ 1459 1460 return 0; 1461 } 1462 1463 /* 1464 * WPA/802.11i assocation request processing. 1465 */ 1466 static int 1467 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1468 const struct ieee80211_frame *wh, const uint8_t *wpa, 1469 const uint8_t *rsn, uint16_t capinfo) 1470 { 1471 struct ieee80211vap *vap = ni->ni_vap; 1472 uint8_t reason; 1473 int badwparsn; 1474 1475 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1476 if (wpa == NULL && rsn == NULL) { 1477 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1478 /* 1479 * W-Fi Protected Setup (WPS) permits 1480 * clients to associate and pass EAPOL frames 1481 * to establish initial credentials. 1482 */ 1483 ni->ni_flags |= IEEE80211_NODE_WPS; 1484 return 1; 1485 } 1486 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1487 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1488 /* 1489 * Transitional Security Network. Permits clients 1490 * to associate and use WEP while WPA is configured. 1491 */ 1492 ni->ni_flags |= IEEE80211_NODE_TSN; 1493 return 1; 1494 } 1495 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1496 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1497 vap->iv_stats.is_rx_assoc_badwpaie++; 1498 reason = IEEE80211_REASON_IE_INVALID; 1499 goto bad; 1500 } 1501 /* assert right association security credentials */ 1502 badwparsn = 0; /* NB: to silence compiler */ 1503 switch (vap->iv_flags & IEEE80211_F_WPA) { 1504 case IEEE80211_F_WPA1: 1505 badwparsn = (wpa == NULL); 1506 break; 1507 case IEEE80211_F_WPA2: 1508 badwparsn = (rsn == NULL); 1509 break; 1510 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1511 badwparsn = (wpa == NULL && rsn == NULL); 1512 break; 1513 } 1514 if (badwparsn) { 1515 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1516 wh, NULL, 1517 "%s", "missing WPA/RSN IE in association request"); 1518 vap->iv_stats.is_rx_assoc_badwpaie++; 1519 reason = IEEE80211_REASON_IE_INVALID; 1520 goto bad; 1521 } 1522 /* 1523 * Parse WPA/RSN information element. 1524 */ 1525 if (wpa != NULL) 1526 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1527 else 1528 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1529 if (reason != 0) { 1530 /* XXX distinguish WPA/RSN? */ 1531 vap->iv_stats.is_rx_assoc_badwpaie++; 1532 goto bad; 1533 } 1534 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1535 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1536 wpa != NULL ? "WPA" : "RSN", 1537 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1538 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1539 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1540 1541 return 1; 1542 bad: 1543 ieee80211_node_deauth(ni, reason); 1544 return 0; 1545 } 1546 1547 /* XXX find a better place for definition */ 1548 struct l2_update_frame { 1549 struct ether_header eh; 1550 uint8_t dsap; 1551 uint8_t ssap; 1552 uint8_t control; 1553 uint8_t xid[3]; 1554 } __packed; 1555 1556 /* 1557 * Deliver a TGf L2UF frame on behalf of a station. 1558 * This primes any bridge when the station is roaming 1559 * between ap's on the same wired network. 1560 */ 1561 static void 1562 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1563 { 1564 struct ieee80211vap *vap = ni->ni_vap; 1565 struct ifnet *ifp = vap->iv_ifp; 1566 struct mbuf *m; 1567 struct l2_update_frame *l2uf; 1568 struct ether_header *eh; 1569 1570 m = m_gethdr(MB_DONTWAIT, MT_DATA); 1571 if (m == NULL) { 1572 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1573 "%s", "no mbuf for l2uf frame"); 1574 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1575 return; 1576 } 1577 l2uf = mtod(m, struct l2_update_frame *); 1578 eh = &l2uf->eh; 1579 /* dst: Broadcast address */ 1580 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1581 /* src: associated STA */ 1582 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1583 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1584 1585 l2uf->dsap = 0; 1586 l2uf->ssap = 0; 1587 l2uf->control = 0xf5; 1588 l2uf->xid[0] = 0x81; 1589 l2uf->xid[1] = 0x80; 1590 l2uf->xid[2] = 0x00; 1591 1592 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1593 hostap_deliver_data(vap, ni, m); 1594 } 1595 1596 static void 1597 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1598 int reassoc, int resp, const char *tag, int rate) 1599 { 1600 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1601 "deny %s request, %s rate set mismatch, rate/MCS %d", 1602 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1603 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1604 ieee80211_node_leave(ni); 1605 } 1606 1607 static void 1608 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1609 int reassoc, int resp, const char *tag, int capinfo) 1610 { 1611 struct ieee80211vap *vap = ni->ni_vap; 1612 1613 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1614 "deny %s request, %s mismatch 0x%x", 1615 reassoc ? "reassoc" : "assoc", tag, capinfo); 1616 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1617 ieee80211_node_leave(ni); 1618 vap->iv_stats.is_rx_assoc_capmismatch++; 1619 } 1620 1621 static void 1622 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1623 int reassoc, int resp) 1624 { 1625 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1626 "deny %s request, missing HT ie", reassoc ? "reassoc" : "assoc"); 1627 /* XXX no better code */ 1628 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1629 ieee80211_node_leave(ni); 1630 } 1631 1632 static void 1633 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1634 int algo, int seq, int status) 1635 { 1636 struct ieee80211vap *vap = ni->ni_vap; 1637 1638 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1639 wh, NULL, "unsupported alg %d", algo); 1640 vap->iv_stats.is_rx_auth_unsupported++; 1641 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1642 seq | (status << 16)); 1643 } 1644 1645 static __inline int 1646 ishtmixed(const uint8_t *ie) 1647 { 1648 const struct ieee80211_ie_htinfo *ht = 1649 (const struct ieee80211_ie_htinfo *) ie; 1650 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1651 IEEE80211_HTINFO_OPMODE_MIXED; 1652 } 1653 1654 static int 1655 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1656 { 1657 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1658 int i; 1659 1660 /* NB: the 11b clients we care about will not have xrates */ 1661 if (xrates != NULL || rates == NULL) 1662 return 0; 1663 for (i = 0; i < rates[1]; i++) { 1664 int r = rates[2+i] & IEEE80211_RATE_VAL; 1665 if (r > 2*11 || ((1<<r) & brates) == 0) 1666 return 0; 1667 } 1668 return 1; 1669 } 1670 1671 static void 1672 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1673 int subtype, int rssi, int nf) 1674 { 1675 struct ieee80211vap *vap = ni->ni_vap; 1676 struct ieee80211com *ic = ni->ni_ic; 1677 struct ieee80211_frame *wh; 1678 uint8_t *frm, *efrm, *sfrm; 1679 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1680 int reassoc, resp; 1681 uint8_t rate; 1682 1683 wh = mtod(m0, struct ieee80211_frame *); 1684 frm = (uint8_t *)&wh[1]; 1685 efrm = mtod(m0, uint8_t *) + m0->m_len; 1686 switch (subtype) { 1687 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1688 case IEEE80211_FC0_SUBTYPE_BEACON: { 1689 struct ieee80211_scanparams scan; 1690 /* 1691 * We process beacon/probe response frames when scanning; 1692 * otherwise we check beacon frames for overlapping non-ERP 1693 * BSS in 11g and/or overlapping legacy BSS when in HT. 1694 */ 1695 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1696 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1697 vap->iv_stats.is_rx_mgtdiscard++; 1698 return; 1699 } 1700 /* NB: accept off-channel frames */ 1701 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1702 return; 1703 /* 1704 * Count frame now that we know it's to be processed. 1705 */ 1706 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1707 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1708 IEEE80211_NODE_STAT(ni, rx_beacons); 1709 } else 1710 IEEE80211_NODE_STAT(ni, rx_proberesp); 1711 /* 1712 * If scanning, just pass information to the scan module. 1713 */ 1714 if (ic->ic_flags & IEEE80211_F_SCAN) { 1715 if (scan.status == 0 && /* NB: on channel */ 1716 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1717 /* 1718 * Actively scanning a channel marked passive; 1719 * send a probe request now that we know there 1720 * is 802.11 traffic present. 1721 * 1722 * XXX check if the beacon we recv'd gives 1723 * us what we need and suppress the probe req 1724 */ 1725 ieee80211_probe_curchan(vap, 1); 1726 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1727 } 1728 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1729 return; 1730 } 1731 /* 1732 * Check beacon for overlapping bss w/ non ERP stations. 1733 * If we detect one and protection is configured but not 1734 * enabled, enable it and start a timer that'll bring us 1735 * out if we stop seeing the bss. 1736 */ 1737 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1738 scan.status == 0 && /* NB: on-channel */ 1739 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1740 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1741 ic->ic_lastnonerp = ticks; 1742 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1743 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1744 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1745 IEEE80211_NOTE_FRAME(vap, 1746 IEEE80211_MSG_ASSOC, wh, 1747 "non-ERP present on channel %d " 1748 "(saw erp 0x%x from channel %d), " 1749 "enable use of protection", 1750 ic->ic_curchan->ic_ieee, 1751 scan.erp, scan.chan); 1752 ic->ic_flags |= IEEE80211_F_USEPROT; 1753 ieee80211_notify_erp(ic); 1754 } 1755 } 1756 /* 1757 * Check beacon for non-HT station on HT channel 1758 * and update HT BSS occupancy as appropriate. 1759 */ 1760 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1761 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1762 /* 1763 * Off control channel; only check frames 1764 * that come in the extension channel when 1765 * operating w/ HT40. 1766 */ 1767 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1768 break; 1769 if (scan.chan != ic->ic_curchan->ic_extieee) 1770 break; 1771 } 1772 if (scan.htinfo == NULL) { 1773 ieee80211_htprot_update(ic, 1774 IEEE80211_HTINFO_OPMODE_PROTOPT | 1775 IEEE80211_HTINFO_NONHT_PRESENT); 1776 } else if (ishtmixed(scan.htinfo)) { 1777 /* XXX? take NONHT_PRESENT from beacon? */ 1778 ieee80211_htprot_update(ic, 1779 IEEE80211_HTINFO_OPMODE_MIXED | 1780 IEEE80211_HTINFO_NONHT_PRESENT); 1781 } 1782 } 1783 break; 1784 } 1785 1786 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1787 if (vap->iv_state != IEEE80211_S_RUN) { 1788 vap->iv_stats.is_rx_mgtdiscard++; 1789 return; 1790 } 1791 /* 1792 * prreq frame format 1793 * [tlv] ssid 1794 * [tlv] supported rates 1795 * [tlv] extended supported rates 1796 */ 1797 ssid = rates = xrates = NULL; 1798 sfrm = frm; 1799 while (efrm - frm > 1) { 1800 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1801 switch (*frm) { 1802 case IEEE80211_ELEMID_SSID: 1803 ssid = frm; 1804 break; 1805 case IEEE80211_ELEMID_RATES: 1806 rates = frm; 1807 break; 1808 case IEEE80211_ELEMID_XRATES: 1809 xrates = frm; 1810 break; 1811 } 1812 frm += frm[1] + 2; 1813 } 1814 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1815 if (xrates != NULL) 1816 IEEE80211_VERIFY_ELEMENT(xrates, 1817 IEEE80211_RATE_MAXSIZE - rates[1], return); 1818 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1819 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1820 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1821 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1822 wh, NULL, 1823 "%s", "no ssid with ssid suppression enabled"); 1824 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1825 return; 1826 } 1827 1828 /* XXX find a better class or define it's own */ 1829 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1830 "%s", "recv probe req"); 1831 /* 1832 * Some legacy 11b clients cannot hack a complete 1833 * probe response frame. When the request includes 1834 * only a bare-bones rate set, communicate this to 1835 * the transmit side. 1836 */ 1837 ieee80211_send_proberesp(vap, wh->i_addr2, 1838 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1839 break; 1840 1841 case IEEE80211_FC0_SUBTYPE_AUTH: { 1842 uint16_t algo, seq, status; 1843 1844 if (vap->iv_state != IEEE80211_S_RUN) { 1845 vap->iv_stats.is_rx_mgtdiscard++; 1846 return; 1847 } 1848 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1849 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1850 wh, NULL, "%s", "wrong bssid"); 1851 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1852 return; 1853 } 1854 /* 1855 * auth frame format 1856 * [2] algorithm 1857 * [2] sequence 1858 * [2] status 1859 * [tlv*] challenge 1860 */ 1861 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1862 algo = le16toh(*(uint16_t *)frm); 1863 seq = le16toh(*(uint16_t *)(frm + 2)); 1864 status = le16toh(*(uint16_t *)(frm + 4)); 1865 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1866 "recv auth frame with algorithm %d seq %d", algo, seq); 1867 /* 1868 * Consult the ACL policy module if setup. 1869 */ 1870 if (vap->iv_acl != NULL && 1871 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1872 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1873 wh, NULL, "%s", "disallowed by ACL"); 1874 vap->iv_stats.is_rx_acl++; 1875 ieee80211_send_error(ni, wh->i_addr2, 1876 IEEE80211_FC0_SUBTYPE_AUTH, 1877 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1878 return; 1879 } 1880 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1881 IEEE80211_DISCARD(vap, 1882 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1883 wh, NULL, "%s", "TKIP countermeasures enabled"); 1884 vap->iv_stats.is_rx_auth_countermeasures++; 1885 ieee80211_send_error(ni, wh->i_addr2, 1886 IEEE80211_FC0_SUBTYPE_AUTH, 1887 IEEE80211_REASON_MIC_FAILURE); 1888 return; 1889 } 1890 if (algo == IEEE80211_AUTH_ALG_SHARED) 1891 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1892 seq, status); 1893 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1894 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1895 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1896 authalgreject(ni, wh, algo, 1897 seq+1, IEEE80211_STATUS_ALG); 1898 return; 1899 } else { 1900 /* 1901 * We assume that an unknown algorithm is the result 1902 * of a decryption failure on a shared key auth frame; 1903 * return a status code appropriate for that instead 1904 * of IEEE80211_STATUS_ALG. 1905 * 1906 * NB: a seq# of 4 is intentional; the decrypted 1907 * frame likely has a bogus seq value. 1908 */ 1909 authalgreject(ni, wh, algo, 1910 4, IEEE80211_STATUS_CHALLENGE); 1911 return; 1912 } 1913 break; 1914 } 1915 1916 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1917 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1918 uint16_t capinfo, lintval; 1919 struct ieee80211_rsnparms rsnparms; 1920 1921 if (vap->iv_state != IEEE80211_S_RUN) { 1922 vap->iv_stats.is_rx_mgtdiscard++; 1923 return; 1924 } 1925 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1926 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1927 wh, NULL, "%s", "wrong bssid"); 1928 vap->iv_stats.is_rx_assoc_bss++; 1929 return; 1930 } 1931 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1932 reassoc = 1; 1933 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1934 } else { 1935 reassoc = 0; 1936 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1937 } 1938 if (ni == vap->iv_bss) { 1939 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1940 "deny %s request, sta not authenticated", 1941 reassoc ? "reassoc" : "assoc"); 1942 ieee80211_send_error(ni, wh->i_addr2, 1943 IEEE80211_FC0_SUBTYPE_DEAUTH, 1944 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1945 vap->iv_stats.is_rx_assoc_notauth++; 1946 return; 1947 } 1948 1949 /* 1950 * asreq frame format 1951 * [2] capability information 1952 * [2] listen interval 1953 * [6*] current AP address (reassoc only) 1954 * [tlv] ssid 1955 * [tlv] supported rates 1956 * [tlv] extended supported rates 1957 * [tlv] WPA or RSN 1958 * [tlv] HT capabilities 1959 * [tlv] Atheros capabilities 1960 */ 1961 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1962 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1963 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1964 if (reassoc) 1965 frm += 6; /* ignore current AP info */ 1966 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1967 sfrm = frm; 1968 while (efrm - frm > 1) { 1969 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1970 switch (*frm) { 1971 case IEEE80211_ELEMID_SSID: 1972 ssid = frm; 1973 break; 1974 case IEEE80211_ELEMID_RATES: 1975 rates = frm; 1976 break; 1977 case IEEE80211_ELEMID_XRATES: 1978 xrates = frm; 1979 break; 1980 case IEEE80211_ELEMID_RSN: 1981 rsn = frm; 1982 break; 1983 case IEEE80211_ELEMID_HTCAP: 1984 htcap = frm; 1985 break; 1986 case IEEE80211_ELEMID_VENDOR: 1987 if (iswpaoui(frm)) 1988 wpa = frm; 1989 else if (iswmeinfo(frm)) 1990 wme = frm; 1991 #ifdef IEEE80211_SUPPORT_SUPERG 1992 else if (isatherosoui(frm)) 1993 ath = frm; 1994 #endif 1995 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1996 if (ishtcapoui(frm) && htcap == NULL) 1997 htcap = frm; 1998 } 1999 break; 2000 } 2001 frm += frm[1] + 2; 2002 } 2003 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2004 if (xrates != NULL) 2005 IEEE80211_VERIFY_ELEMENT(xrates, 2006 IEEE80211_RATE_MAXSIZE - rates[1], return); 2007 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2008 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2009 if (htcap != NULL) { 2010 IEEE80211_VERIFY_LENGTH(htcap[1], 2011 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2012 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2013 sizeof(struct ieee80211_ie_htcap)-2, 2014 return); /* XXX just NULL out? */ 2015 } 2016 2017 if ((vap->iv_flags & IEEE80211_F_WPA) && 2018 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2019 return; 2020 /* discard challenge after association */ 2021 if (ni->ni_challenge != NULL) { 2022 kfree(ni->ni_challenge, M_80211_NODE); 2023 ni->ni_challenge = NULL; 2024 } 2025 /* NB: 802.11 spec says to ignore station's privacy bit */ 2026 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2027 capinfomismatch(ni, wh, reassoc, resp, 2028 "capability", capinfo); 2029 return; 2030 } 2031 /* 2032 * Disallow re-associate w/ invalid slot time setting. 2033 */ 2034 if (ni->ni_associd != 0 && 2035 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2036 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2037 capinfomismatch(ni, wh, reassoc, resp, 2038 "slot time", capinfo); 2039 return; 2040 } 2041 rate = ieee80211_setup_rates(ni, rates, xrates, 2042 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2043 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2044 if (rate & IEEE80211_RATE_BASIC) { 2045 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2046 vap->iv_stats.is_rx_assoc_norate++; 2047 return; 2048 } 2049 /* 2050 * If constrained to 11g-only stations reject an 2051 * 11b-only station. We cheat a bit here by looking 2052 * at the max negotiated xmit rate and assuming anyone 2053 * with a best rate <24Mb/s is an 11b station. 2054 */ 2055 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2056 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2057 vap->iv_stats.is_rx_assoc_norate++; 2058 return; 2059 } 2060 /* 2061 * Do HT rate set handling and setup HT node state. 2062 */ 2063 ni->ni_chan = vap->iv_bss->ni_chan; 2064 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2065 rate = ieee80211_setup_htrates(ni, htcap, 2066 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2067 IEEE80211_F_DOBRS); 2068 if (rate & IEEE80211_RATE_BASIC) { 2069 ratesetmismatch(ni, wh, reassoc, resp, 2070 "HT", rate); 2071 vap->iv_stats.is_ht_assoc_norate++; 2072 return; 2073 } 2074 ieee80211_ht_node_init(ni); 2075 ieee80211_ht_updatehtcap(ni, htcap); 2076 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2077 ieee80211_ht_node_cleanup(ni); 2078 #ifdef IEEE80211_SUPPORT_SUPERG 2079 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2080 ieee80211_ff_node_cleanup(ni); 2081 #endif 2082 /* 2083 * Allow AMPDU operation only with unencrypted traffic 2084 * or AES-CCM; the 11n spec only specifies these ciphers 2085 * so permitting any others is undefined and can lead 2086 * to interoperability problems. 2087 */ 2088 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2089 (((vap->iv_flags & IEEE80211_F_WPA) && 2090 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2091 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2092 IEEE80211_NOTE(vap, 2093 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2094 "disallow HT use because WEP or TKIP requested, " 2095 "capinfo 0x%x ucastcipher %d", capinfo, 2096 rsnparms.rsn_ucastcipher); 2097 ieee80211_ht_node_cleanup(ni); 2098 vap->iv_stats.is_ht_assoc_downgrade++; 2099 } 2100 /* 2101 * If constrained to 11n-only stations reject legacy stations. 2102 */ 2103 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2104 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2105 htcapmismatch(ni, wh, reassoc, resp); 2106 vap->iv_stats.is_ht_assoc_nohtcap++; 2107 return; 2108 } 2109 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2110 ni->ni_noise = nf; 2111 ni->ni_intval = lintval; 2112 ni->ni_capinfo = capinfo; 2113 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2114 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2115 /* 2116 * Store the IEs. 2117 * XXX maybe better to just expand 2118 */ 2119 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2120 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2121 if (wpa != NULL) 2122 setie(wpa_ie, wpa - sfrm); 2123 if (rsn != NULL) 2124 setie(rsn_ie, rsn - sfrm); 2125 if (htcap != NULL) 2126 setie(htcap_ie, htcap - sfrm); 2127 if (wme != NULL) { 2128 setie(wme_ie, wme - sfrm); 2129 /* 2130 * Mark node as capable of QoS. 2131 */ 2132 ni->ni_flags |= IEEE80211_NODE_QOS; 2133 } else 2134 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2135 #ifdef IEEE80211_SUPPORT_SUPERG 2136 if (ath != NULL) { 2137 setie(ath_ie, ath - sfrm); 2138 /* 2139 * Parse ATH station parameters. 2140 */ 2141 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2142 } else 2143 #endif 2144 ni->ni_ath_flags = 0; 2145 #undef setie 2146 } else { 2147 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2148 ni->ni_ath_flags = 0; 2149 } 2150 ieee80211_node_join(ni, resp); 2151 ieee80211_deliver_l2uf(ni); 2152 break; 2153 } 2154 2155 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2156 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2157 uint16_t reason; 2158 2159 if (vap->iv_state != IEEE80211_S_RUN || 2160 /* NB: can happen when in promiscuous mode */ 2161 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2162 vap->iv_stats.is_rx_mgtdiscard++; 2163 break; 2164 } 2165 /* 2166 * deauth/disassoc frame format 2167 * [2] reason 2168 */ 2169 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2170 reason = le16toh(*(uint16_t *)frm); 2171 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2172 vap->iv_stats.is_rx_deauth++; 2173 IEEE80211_NODE_STAT(ni, rx_deauth); 2174 } else { 2175 vap->iv_stats.is_rx_disassoc++; 2176 IEEE80211_NODE_STAT(ni, rx_disassoc); 2177 } 2178 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2179 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2180 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2181 if (ni != vap->iv_bss) 2182 ieee80211_node_leave(ni); 2183 break; 2184 } 2185 2186 case IEEE80211_FC0_SUBTYPE_ACTION: 2187 if (vap->iv_state == IEEE80211_S_RUN) { 2188 if (ieee80211_parse_action(ni, m0) == 0) 2189 ic->ic_recv_action(ni, wh, frm, efrm); 2190 } else 2191 vap->iv_stats.is_rx_mgtdiscard++; 2192 break; 2193 2194 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2195 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2196 default: 2197 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2198 wh, "mgt", "subtype 0x%x not handled", subtype); 2199 vap->iv_stats.is_rx_badsubtype++; 2200 break; 2201 } 2202 } 2203 2204 static void 2205 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2206 { 2207 switch (subtype) { 2208 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2209 hostap_recv_pspoll(ni, m); 2210 break; 2211 case IEEE80211_FC0_SUBTYPE_BAR: 2212 ieee80211_recv_bar(ni, m); 2213 break; 2214 } 2215 } 2216 2217 /* 2218 * Process a received ps-poll frame. 2219 */ 2220 static void 2221 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2222 { 2223 struct ieee80211vap *vap = ni->ni_vap; 2224 struct ieee80211_frame_min *wh; 2225 struct ifnet *ifp; 2226 struct ifaltq_subque *ifsq; 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 2295 ifsq = ifq_get_subq_default(&ifp->if_snd); 2296 ifsq_enqueue(ifsq, m, NULL); 2297 ifp->if_start(ifp, ifsq); 2298 } 2299