1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11 HOSTAP mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_media.h> 52 #include <net/if_llc.h> 53 #include <net/ethernet.h> 54 55 #include <net/bpf.h> 56 57 #include <net80211/ieee80211_var.h> 58 #include <net80211/ieee80211_hostap.h> 59 #include <net80211/ieee80211_input.h> 60 #ifdef IEEE80211_SUPPORT_SUPERG 61 #include <net80211/ieee80211_superg.h> 62 #endif 63 #include <net80211/ieee80211_wds.h> 64 65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 66 67 static void hostap_vattach(struct ieee80211vap *); 68 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 70 int rssi, int nf); 71 static void hostap_deliver_data(struct ieee80211vap *, 72 struct ieee80211_node *, struct mbuf *); 73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int nf); 75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 76 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *); 77 78 void 79 ieee80211_hostap_attach(struct ieee80211com *ic) 80 { 81 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 82 } 83 84 void 85 ieee80211_hostap_detach(struct ieee80211com *ic) 86 { 87 } 88 89 static void 90 hostap_vdetach(struct ieee80211vap *vap) 91 { 92 } 93 94 static void 95 hostap_vattach(struct ieee80211vap *vap) 96 { 97 vap->iv_newstate = hostap_newstate; 98 vap->iv_input = hostap_input; 99 vap->iv_recv_mgmt = hostap_recv_mgmt; 100 vap->iv_recv_ctl = hostap_recv_ctl; 101 vap->iv_opdetach = hostap_vdetach; 102 vap->iv_deliver_data = hostap_deliver_data; 103 } 104 105 static void 106 sta_disassoc(void *arg, struct ieee80211_node *ni) 107 { 108 struct ieee80211vap *vap = arg; 109 110 if (ni->ni_vap == vap && ni->ni_associd != 0) { 111 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 112 IEEE80211_REASON_ASSOC_LEAVE); 113 ieee80211_node_leave(ni); 114 } 115 } 116 117 static void 118 sta_csa(void *arg, struct ieee80211_node *ni) 119 { 120 struct ieee80211vap *vap = arg; 121 122 if (ni->ni_vap == vap && ni->ni_associd != 0) 123 if (ni->ni_inact > vap->iv_inact_init) { 124 ni->ni_inact = vap->iv_inact_init; 125 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 126 "%s: inact %u", __func__, ni->ni_inact); 127 } 128 } 129 130 static void 131 sta_drop(void *arg, struct ieee80211_node *ni) 132 { 133 struct ieee80211vap *vap = arg; 134 135 if (ni->ni_vap == vap && ni->ni_associd != 0) 136 ieee80211_node_leave(ni); 137 } 138 139 /* 140 * Does a channel change require associated stations to re-associate 141 * so protocol state is correct. This is used when doing CSA across 142 * bands or similar (e.g. HT -> legacy). 143 */ 144 static int 145 isbandchange(struct ieee80211com *ic) 146 { 147 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 148 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 149 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 150 } 151 152 /* 153 * IEEE80211_M_HOSTAP vap state machine handler. 154 */ 155 static int 156 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 157 { 158 struct ieee80211com *ic = vap->iv_ic; 159 enum ieee80211_state ostate; 160 161 IEEE80211_LOCK_ASSERT(ic); 162 163 ostate = vap->iv_state; 164 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 165 __func__, ieee80211_state_name[ostate], 166 ieee80211_state_name[nstate], arg); 167 vap->iv_state = nstate; /* state transition */ 168 if (ostate != IEEE80211_S_SCAN) 169 ieee80211_cancel_scan(vap); /* background scan */ 170 switch (nstate) { 171 case IEEE80211_S_INIT: 172 switch (ostate) { 173 case IEEE80211_S_SCAN: 174 ieee80211_cancel_scan(vap); 175 break; 176 case IEEE80211_S_CAC: 177 ieee80211_dfs_cac_stop(vap); 178 break; 179 case IEEE80211_S_RUN: 180 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 181 break; 182 default: 183 break; 184 } 185 if (ostate != IEEE80211_S_INIT) { 186 /* NB: optimize INIT -> INIT case */ 187 ieee80211_reset_bss(vap); 188 } 189 if (vap->iv_auth->ia_detach != NULL) 190 vap->iv_auth->ia_detach(vap); 191 break; 192 case IEEE80211_S_SCAN: 193 switch (ostate) { 194 case IEEE80211_S_CSA: 195 case IEEE80211_S_RUN: 196 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 197 /* 198 * Clear overlapping BSS state; the beacon frame 199 * will be reconstructed on transition to the RUN 200 * state and the timeout routines check if the flag 201 * is set before doing anything so this is sufficient. 202 */ 203 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 204 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 205 /* fall thru... */ 206 case IEEE80211_S_CAC: 207 /* 208 * NB: We may get here because of a manual channel 209 * change in which case we need to stop CAC 210 * XXX no need to stop if ostate RUN but it's ok 211 */ 212 ieee80211_dfs_cac_stop(vap); 213 /* fall thru... */ 214 case IEEE80211_S_INIT: 215 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 216 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 217 /* 218 * Already have a channel; bypass the 219 * scan and startup immediately. 220 * ieee80211_create_ibss will call back to 221 * move us to RUN state. 222 */ 223 ieee80211_create_ibss(vap, vap->iv_des_chan); 224 break; 225 } 226 /* 227 * Initiate a scan. We can come here as a result 228 * of an IEEE80211_IOC_SCAN_REQ too in which case 229 * the vap will be marked with IEEE80211_FEXT_SCANREQ 230 * and the scan request parameters will be present 231 * in iv_scanreq. Otherwise we do the default. 232 */ 233 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 234 ieee80211_check_scan(vap, 235 vap->iv_scanreq_flags, 236 vap->iv_scanreq_duration, 237 vap->iv_scanreq_mindwell, 238 vap->iv_scanreq_maxdwell, 239 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 240 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 241 } else 242 ieee80211_check_scan_current(vap); 243 break; 244 case IEEE80211_S_SCAN: 245 /* 246 * A state change requires a reset; scan. 247 */ 248 ieee80211_check_scan_current(vap); 249 break; 250 default: 251 break; 252 } 253 break; 254 case IEEE80211_S_CAC: 255 /* 256 * Start CAC on a DFS channel. We come here when starting 257 * a bss on a DFS channel (see ieee80211_create_ibss). 258 */ 259 ieee80211_dfs_cac_start(vap); 260 break; 261 case IEEE80211_S_RUN: 262 if (vap->iv_flags & IEEE80211_F_WPA) { 263 /* XXX validate prerequisites */ 264 } 265 switch (ostate) { 266 case IEEE80211_S_INIT: 267 /* 268 * Already have a channel; bypass the 269 * scan and startup immediately. 270 * Note that ieee80211_create_ibss will call 271 * back to do a RUN->RUN state change. 272 */ 273 ieee80211_create_ibss(vap, 274 ieee80211_ht_adjust_channel(ic, 275 ic->ic_curchan, vap->iv_flags_ht)); 276 /* NB: iv_bss is changed on return */ 277 break; 278 case IEEE80211_S_CAC: 279 /* 280 * NB: This is the normal state change when CAC 281 * expires and no radar was detected; no need to 282 * clear the CAC timer as it's already expired. 283 */ 284 /* fall thru... */ 285 case IEEE80211_S_CSA: 286 /* 287 * Shorten inactivity timer of associated stations 288 * to weed out sta's that don't follow a CSA. 289 */ 290 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 291 /* 292 * Update bss node channel to reflect where 293 * we landed after CSA. 294 */ 295 ieee80211_node_set_chan(vap->iv_bss, 296 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 297 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 298 /* XXX bypass debug msgs */ 299 break; 300 case IEEE80211_S_SCAN: 301 case IEEE80211_S_RUN: 302 #ifdef IEEE80211_DEBUG 303 if (ieee80211_msg_debug(vap)) { 304 struct ieee80211_node *ni = vap->iv_bss; 305 ieee80211_note(vap, 306 "synchronized with %s ssid ", 307 ether_sprintf(ni->ni_bssid)); 308 ieee80211_print_essid(ni->ni_essid, 309 ni->ni_esslen); 310 /* XXX MCS/HT */ 311 printf(" channel %d start %uMb\n", 312 ieee80211_chan2ieee(ic, ic->ic_curchan), 313 IEEE80211_RATE2MBS(ni->ni_txrate)); 314 } 315 #endif 316 break; 317 default: 318 break; 319 } 320 /* 321 * Start/stop the authenticator. We delay until here 322 * to allow configuration to happen out of order. 323 */ 324 if (vap->iv_auth->ia_attach != NULL) { 325 /* XXX check failure */ 326 vap->iv_auth->ia_attach(vap); 327 } else if (vap->iv_auth->ia_detach != NULL) { 328 vap->iv_auth->ia_detach(vap); 329 } 330 ieee80211_node_authorize(vap->iv_bss); 331 break; 332 case IEEE80211_S_CSA: 333 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 334 /* 335 * On a ``band change'' silently drop associated 336 * stations as they must re-associate before they 337 * can pass traffic (as otherwise protocol state 338 * such as capabilities and the negotiated rate 339 * set may/will be wrong). 340 */ 341 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 342 } 343 break; 344 default: 345 break; 346 } 347 return 0; 348 } 349 350 static void 351 hostap_deliver_data(struct ieee80211vap *vap, 352 struct ieee80211_node *ni, struct mbuf *m) 353 { 354 struct ether_header *eh = mtod(m, struct ether_header *); 355 struct ifnet *ifp = vap->iv_ifp; 356 357 /* clear driver/net80211 flags before passing up */ 358 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 359 360 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 361 ("gack, opmode %d", vap->iv_opmode)); 362 /* 363 * Do accounting. 364 */ 365 ifp->if_ipackets++; 366 IEEE80211_NODE_STAT(ni, rx_data); 367 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 368 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 369 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 370 IEEE80211_NODE_STAT(ni, rx_mcast); 371 } else 372 IEEE80211_NODE_STAT(ni, rx_ucast); 373 374 /* perform as a bridge within the AP */ 375 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 376 struct mbuf *mcopy = NULL; 377 378 if (m->m_flags & M_MCAST) { 379 mcopy = m_dup(m, M_DONTWAIT); 380 if (mcopy == NULL) 381 ifp->if_oerrors++; 382 else 383 mcopy->m_flags |= M_MCAST; 384 } else { 385 /* 386 * Check if the destination is associated with the 387 * same vap and authorized to receive traffic. 388 * Beware of traffic destined for the vap itself; 389 * sending it will not work; just let it be delivered 390 * normally. 391 */ 392 struct ieee80211_node *sta = ieee80211_find_vap_node( 393 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 394 if (sta != NULL) { 395 if (ieee80211_node_is_authorized(sta)) { 396 /* 397 * Beware of sending to ourself; this 398 * needs to happen via the normal 399 * input path. 400 */ 401 if (sta != vap->iv_bss) { 402 mcopy = m; 403 m = NULL; 404 } 405 } else { 406 vap->iv_stats.is_rx_unauth++; 407 IEEE80211_NODE_STAT(sta, rx_unauth); 408 } 409 ieee80211_free_node(sta); 410 } 411 } 412 if (mcopy != NULL) { 413 int len, err; 414 len = mcopy->m_pkthdr.len; 415 err = ifp->if_transmit(ifp, mcopy); 416 if (err) { 417 /* NB: IFQ_HANDOFF reclaims mcopy */ 418 } else { 419 ifp->if_opackets++; 420 } 421 } 422 } 423 if (m != NULL) { 424 /* 425 * Mark frame as coming from vap's interface. 426 */ 427 m->m_pkthdr.rcvif = ifp; 428 if (m->m_flags & M_MCAST) { 429 /* 430 * Spam DWDS vap's w/ multicast traffic. 431 */ 432 /* XXX only if dwds in use? */ 433 ieee80211_dwds_mcast(vap, m); 434 } 435 if (ni->ni_vlan != 0) { 436 /* attach vlan tag */ 437 m->m_pkthdr.ether_vtag = ni->ni_vlan; 438 m->m_flags |= M_VLANTAG; 439 } 440 ifp->if_input(ifp, m); 441 } 442 } 443 444 /* 445 * Decide if a received management frame should be 446 * printed when debugging is enabled. This filters some 447 * of the less interesting frames that come frequently 448 * (e.g. beacons). 449 */ 450 static __inline int 451 doprint(struct ieee80211vap *vap, int subtype) 452 { 453 switch (subtype) { 454 case IEEE80211_FC0_SUBTYPE_BEACON: 455 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 456 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 457 return 0; 458 } 459 return 1; 460 } 461 462 /* 463 * Process a received frame. The node associated with the sender 464 * should be supplied. If nothing was found in the node table then 465 * the caller is assumed to supply a reference to iv_bss instead. 466 * The RSSI and a timestamp are also supplied. The RSSI data is used 467 * during AP scanning to select a AP to associate with; it can have 468 * any units so long as values have consistent units and higher values 469 * mean ``better signal''. The receive timestamp is currently not used 470 * by the 802.11 layer. 471 */ 472 static int 473 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 474 { 475 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 476 #define HAS_SEQ(type) ((type & 0x4) == 0) 477 struct ieee80211vap *vap = ni->ni_vap; 478 struct ieee80211com *ic = ni->ni_ic; 479 struct ifnet *ifp = vap->iv_ifp; 480 struct ieee80211_frame *wh; 481 struct ieee80211_key *key; 482 struct ether_header *eh; 483 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 484 uint8_t dir, type, subtype, qos; 485 uint8_t *bssid; 486 uint16_t rxseq; 487 488 if (m->m_flags & M_AMPDU_MPDU) { 489 /* 490 * Fastpath for A-MPDU reorder q resubmission. Frames 491 * w/ M_AMPDU_MPDU marked have already passed through 492 * here but were received out of order and been held on 493 * the reorder queue. When resubmitted they are marked 494 * with the M_AMPDU_MPDU flag and we can bypass most of 495 * the normal processing. 496 */ 497 wh = mtod(m, struct ieee80211_frame *); 498 type = IEEE80211_FC0_TYPE_DATA; 499 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 500 subtype = IEEE80211_FC0_SUBTYPE_QOS; 501 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 502 goto resubmit_ampdu; 503 } 504 505 KASSERT(ni != NULL, ("null node")); 506 ni->ni_inact = ni->ni_inact_reload; 507 508 type = -1; /* undefined */ 509 510 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 511 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 512 ni->ni_macaddr, NULL, 513 "too short (1): len %u", m->m_pkthdr.len); 514 vap->iv_stats.is_rx_tooshort++; 515 goto out; 516 } 517 /* 518 * Bit of a cheat here, we use a pointer for a 3-address 519 * frame format but don't reference fields past outside 520 * ieee80211_frame_min w/o first validating the data is 521 * present. 522 */ 523 wh = mtod(m, struct ieee80211_frame *); 524 525 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 526 IEEE80211_FC0_VERSION_0) { 527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 528 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 529 wh->i_fc[0], wh->i_fc[1]); 530 vap->iv_stats.is_rx_badversion++; 531 goto err; 532 } 533 534 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 535 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 536 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 537 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 538 if (dir != IEEE80211_FC1_DIR_NODS) 539 bssid = wh->i_addr1; 540 else if (type == IEEE80211_FC0_TYPE_CTL) 541 bssid = wh->i_addr1; 542 else { 543 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 544 IEEE80211_DISCARD_MAC(vap, 545 IEEE80211_MSG_ANY, ni->ni_macaddr, 546 NULL, "too short (2): len %u", 547 m->m_pkthdr.len); 548 vap->iv_stats.is_rx_tooshort++; 549 goto out; 550 } 551 bssid = wh->i_addr3; 552 } 553 /* 554 * Validate the bssid. 555 */ 556 if (!(type == IEEE80211_FC0_TYPE_MGT && 557 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 558 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 559 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 560 /* not interested in */ 561 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 562 bssid, NULL, "%s", "not to bss"); 563 vap->iv_stats.is_rx_wrongbss++; 564 goto out; 565 } 566 567 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 568 ni->ni_noise = nf; 569 if (HAS_SEQ(type)) { 570 uint8_t tid = ieee80211_gettid(wh); 571 if (IEEE80211_QOS_HAS_SEQ(wh) && 572 TID_TO_WME_AC(tid) >= WME_AC_VI) 573 ic->ic_wme.wme_hipri_traffic++; 574 rxseq = le16toh(*(uint16_t *)wh->i_seq); 575 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 576 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 577 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 578 /* duplicate, discard */ 579 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 580 bssid, "duplicate", 581 "seqno <%u,%u> fragno <%u,%u> tid %u", 582 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 583 ni->ni_rxseqs[tid] >> 584 IEEE80211_SEQ_SEQ_SHIFT, 585 rxseq & IEEE80211_SEQ_FRAG_MASK, 586 ni->ni_rxseqs[tid] & 587 IEEE80211_SEQ_FRAG_MASK, 588 tid); 589 vap->iv_stats.is_rx_dup++; 590 IEEE80211_NODE_STAT(ni, rx_dup); 591 goto out; 592 } 593 ni->ni_rxseqs[tid] = rxseq; 594 } 595 } 596 597 switch (type) { 598 case IEEE80211_FC0_TYPE_DATA: 599 hdrspace = ieee80211_hdrspace(ic, wh); 600 if (m->m_len < hdrspace && 601 (m = m_pullup(m, hdrspace)) == NULL) { 602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 603 ni->ni_macaddr, NULL, 604 "data too short: expecting %u", hdrspace); 605 vap->iv_stats.is_rx_tooshort++; 606 goto out; /* XXX */ 607 } 608 if (!(dir == IEEE80211_FC1_DIR_TODS || 609 (dir == IEEE80211_FC1_DIR_DSTODS && 610 (vap->iv_flags & IEEE80211_F_DWDS)))) { 611 if (dir != IEEE80211_FC1_DIR_DSTODS) { 612 IEEE80211_DISCARD(vap, 613 IEEE80211_MSG_INPUT, wh, "data", 614 "incorrect dir 0x%x", dir); 615 } else { 616 IEEE80211_DISCARD(vap, 617 IEEE80211_MSG_INPUT | 618 IEEE80211_MSG_WDS, wh, 619 "4-address data", 620 "%s", "DWDS not enabled"); 621 } 622 vap->iv_stats.is_rx_wrongdir++; 623 goto out; 624 } 625 /* check if source STA is associated */ 626 if (ni == vap->iv_bss) { 627 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 628 wh, "data", "%s", "unknown src"); 629 ieee80211_send_error(ni, wh->i_addr2, 630 IEEE80211_FC0_SUBTYPE_DEAUTH, 631 IEEE80211_REASON_NOT_AUTHED); 632 vap->iv_stats.is_rx_notassoc++; 633 goto err; 634 } 635 if (ni->ni_associd == 0) { 636 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 637 wh, "data", "%s", "unassoc src"); 638 IEEE80211_SEND_MGMT(ni, 639 IEEE80211_FC0_SUBTYPE_DISASSOC, 640 IEEE80211_REASON_NOT_ASSOCED); 641 vap->iv_stats.is_rx_notassoc++; 642 goto err; 643 } 644 645 /* 646 * Check for power save state change. 647 * XXX out-of-order A-MPDU frames? 648 */ 649 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 650 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 651 ieee80211_node_pwrsave(ni, 652 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 653 /* 654 * For 4-address packets handle WDS discovery 655 * notifications. Once a WDS link is setup frames 656 * are just delivered to the WDS vap (see below). 657 */ 658 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 659 if (!ieee80211_node_is_authorized(ni)) { 660 IEEE80211_DISCARD(vap, 661 IEEE80211_MSG_INPUT | 662 IEEE80211_MSG_WDS, wh, 663 "4-address data", 664 "%s", "unauthorized port"); 665 vap->iv_stats.is_rx_unauth++; 666 IEEE80211_NODE_STAT(ni, rx_unauth); 667 goto err; 668 } 669 ieee80211_dwds_discover(ni, m); 670 return type; 671 } 672 673 /* 674 * Handle A-MPDU re-ordering. If the frame is to be 675 * processed directly then ieee80211_ampdu_reorder 676 * will return 0; otherwise it has consumed the mbuf 677 * and we should do nothing more with it. 678 */ 679 if ((m->m_flags & M_AMPDU) && 680 ieee80211_ampdu_reorder(ni, m) != 0) { 681 m = NULL; 682 goto out; 683 } 684 resubmit_ampdu: 685 686 /* 687 * Handle privacy requirements. Note that we 688 * must not be preempted from here until after 689 * we (potentially) call ieee80211_crypto_demic; 690 * otherwise we may violate assumptions in the 691 * crypto cipher modules used to do delayed update 692 * of replay sequence numbers. 693 */ 694 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 695 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 696 /* 697 * Discard encrypted frames when privacy is off. 698 */ 699 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 700 wh, "WEP", "%s", "PRIVACY off"); 701 vap->iv_stats.is_rx_noprivacy++; 702 IEEE80211_NODE_STAT(ni, rx_noprivacy); 703 goto out; 704 } 705 key = ieee80211_crypto_decap(ni, m, hdrspace); 706 if (key == NULL) { 707 /* NB: stats+msgs handled in crypto_decap */ 708 IEEE80211_NODE_STAT(ni, rx_wepfail); 709 goto out; 710 } 711 wh = mtod(m, struct ieee80211_frame *); 712 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 713 } else { 714 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 715 key = NULL; 716 } 717 718 /* 719 * Save QoS bits for use below--before we strip the header. 720 */ 721 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 722 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 723 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 724 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 725 } else 726 qos = 0; 727 728 /* 729 * Next up, any fragmentation. 730 */ 731 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 732 m = ieee80211_defrag(ni, m, hdrspace); 733 if (m == NULL) { 734 /* Fragment dropped or frame not complete yet */ 735 goto out; 736 } 737 } 738 wh = NULL; /* no longer valid, catch any uses */ 739 740 /* 741 * Next strip any MSDU crypto bits. 742 */ 743 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 744 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 745 ni->ni_macaddr, "data", "%s", "demic error"); 746 vap->iv_stats.is_rx_demicfail++; 747 IEEE80211_NODE_STAT(ni, rx_demicfail); 748 goto out; 749 } 750 /* copy to listener after decrypt */ 751 if (ieee80211_radiotap_active_vap(vap)) 752 ieee80211_radiotap_rx(vap, m); 753 need_tap = 0; 754 /* 755 * Finally, strip the 802.11 header. 756 */ 757 m = ieee80211_decap(vap, m, hdrspace); 758 if (m == NULL) { 759 /* XXX mask bit to check for both */ 760 /* don't count Null data frames as errors */ 761 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 762 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 763 goto out; 764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 765 ni->ni_macaddr, "data", "%s", "decap error"); 766 vap->iv_stats.is_rx_decap++; 767 IEEE80211_NODE_STAT(ni, rx_decap); 768 goto err; 769 } 770 eh = mtod(m, struct ether_header *); 771 if (!ieee80211_node_is_authorized(ni)) { 772 /* 773 * Deny any non-PAE frames received prior to 774 * authorization. For open/shared-key 775 * authentication the port is mark authorized 776 * after authentication completes. For 802.1x 777 * the port is not marked authorized by the 778 * authenticator until the handshake has completed. 779 */ 780 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 781 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 782 eh->ether_shost, "data", 783 "unauthorized port: ether type 0x%x len %u", 784 eh->ether_type, m->m_pkthdr.len); 785 vap->iv_stats.is_rx_unauth++; 786 IEEE80211_NODE_STAT(ni, rx_unauth); 787 goto err; 788 } 789 } else { 790 /* 791 * When denying unencrypted frames, discard 792 * any non-PAE frames received without encryption. 793 */ 794 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 795 (key == NULL && (m->m_flags & M_WEP) == 0) && 796 eh->ether_type != htons(ETHERTYPE_PAE)) { 797 /* 798 * Drop unencrypted frames. 799 */ 800 vap->iv_stats.is_rx_unencrypted++; 801 IEEE80211_NODE_STAT(ni, rx_unencrypted); 802 goto out; 803 } 804 } 805 /* XXX require HT? */ 806 if (qos & IEEE80211_QOS_AMSDU) { 807 m = ieee80211_decap_amsdu(ni, m); 808 if (m == NULL) 809 return IEEE80211_FC0_TYPE_DATA; 810 } else { 811 #ifdef IEEE80211_SUPPORT_SUPERG 812 m = ieee80211_decap_fastframe(vap, ni, m); 813 if (m == NULL) 814 return IEEE80211_FC0_TYPE_DATA; 815 #endif 816 } 817 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 818 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 819 else 820 hostap_deliver_data(vap, ni, m); 821 return IEEE80211_FC0_TYPE_DATA; 822 823 case IEEE80211_FC0_TYPE_MGT: 824 vap->iv_stats.is_rx_mgmt++; 825 IEEE80211_NODE_STAT(ni, rx_mgmt); 826 if (dir != IEEE80211_FC1_DIR_NODS) { 827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 828 wh, "mgt", "incorrect dir 0x%x", dir); 829 vap->iv_stats.is_rx_wrongdir++; 830 goto err; 831 } 832 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 833 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 834 ni->ni_macaddr, "mgt", "too short: len %u", 835 m->m_pkthdr.len); 836 vap->iv_stats.is_rx_tooshort++; 837 goto out; 838 } 839 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 840 /* ensure return frames are unicast */ 841 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 842 wh, NULL, "source is multicast: %s", 843 ether_sprintf(wh->i_addr2)); 844 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 845 goto out; 846 } 847 #ifdef IEEE80211_DEBUG 848 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 849 ieee80211_msg_dumppkts(vap)) { 850 if_printf(ifp, "received %s from %s rssi %d\n", 851 ieee80211_mgt_subtype_name[subtype >> 852 IEEE80211_FC0_SUBTYPE_SHIFT], 853 ether_sprintf(wh->i_addr2), rssi); 854 } 855 #endif 856 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 858 /* 859 * Only shared key auth frames with a challenge 860 * should be encrypted, discard all others. 861 */ 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, NULL, 864 "%s", "WEP set but not permitted"); 865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 866 goto out; 867 } 868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 869 /* 870 * Discard encrypted frames when privacy is off. 871 */ 872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 873 wh, NULL, "%s", "WEP set but PRIVACY off"); 874 vap->iv_stats.is_rx_noprivacy++; 875 goto out; 876 } 877 hdrspace = ieee80211_hdrspace(ic, wh); 878 key = ieee80211_crypto_decap(ni, m, hdrspace); 879 if (key == NULL) { 880 /* NB: stats+msgs handled in crypto_decap */ 881 goto out; 882 } 883 wh = mtod(m, struct ieee80211_frame *); 884 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 885 } 886 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 887 goto out; 888 889 case IEEE80211_FC0_TYPE_CTL: 890 vap->iv_stats.is_rx_ctl++; 891 IEEE80211_NODE_STAT(ni, rx_ctrl); 892 vap->iv_recv_ctl(ni, m, subtype); 893 goto out; 894 default: 895 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 896 wh, "bad", "frame type 0x%x", type); 897 /* should not come here */ 898 break; 899 } 900 err: 901 ifp->if_ierrors++; 902 out: 903 if (m != NULL) { 904 if (need_tap && ieee80211_radiotap_active_vap(vap)) 905 ieee80211_radiotap_rx(vap, m); 906 m_freem(m); 907 } 908 return type; 909 #undef SEQ_LEQ 910 } 911 912 static void 913 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 914 int rssi, int nf, uint16_t seq, uint16_t status) 915 { 916 struct ieee80211vap *vap = ni->ni_vap; 917 918 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 919 920 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 921 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 922 ni->ni_macaddr, "open auth", 923 "bad sta auth mode %u", ni->ni_authmode); 924 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 925 /* 926 * Clear any challenge text that may be there if 927 * a previous shared key auth failed and then an 928 * open auth is attempted. 929 */ 930 if (ni->ni_challenge != NULL) { 931 free(ni->ni_challenge, M_80211_NODE); 932 ni->ni_challenge = NULL; 933 } 934 /* XXX hack to workaround calling convention */ 935 ieee80211_send_error(ni, wh->i_addr2, 936 IEEE80211_FC0_SUBTYPE_AUTH, 937 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 938 return; 939 } 940 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 941 vap->iv_stats.is_rx_bad_auth++; 942 return; 943 } 944 /* always accept open authentication requests */ 945 if (ni == vap->iv_bss) { 946 ni = ieee80211_dup_bss(vap, wh->i_addr2); 947 if (ni == NULL) 948 return; 949 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 950 (void) ieee80211_ref_node(ni); 951 /* 952 * Mark the node as referenced to reflect that it's 953 * reference count has been bumped to insure it remains 954 * after the transaction completes. 955 */ 956 ni->ni_flags |= IEEE80211_NODE_AREF; 957 /* 958 * Mark the node as requiring a valid association id 959 * before outbound traffic is permitted. 960 */ 961 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 962 963 if (vap->iv_acl != NULL && 964 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 965 /* 966 * When the ACL policy is set to RADIUS we defer the 967 * authorization to a user agent. Dispatch an event, 968 * a subsequent MLME call will decide the fate of the 969 * station. If the user agent is not present then the 970 * node will be reclaimed due to inactivity. 971 */ 972 IEEE80211_NOTE_MAC(vap, 973 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 974 "%s", "station authentication defered (radius acl)"); 975 ieee80211_notify_node_auth(ni); 976 } else { 977 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 978 IEEE80211_NOTE_MAC(vap, 979 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 980 "%s", "station authenticated (open)"); 981 /* 982 * When 802.1x is not in use mark the port 983 * authorized at this point so traffic can flow. 984 */ 985 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 986 ieee80211_node_authorize(ni); 987 } 988 } 989 990 static void 991 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 992 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 993 uint16_t seq, uint16_t status) 994 { 995 struct ieee80211vap *vap = ni->ni_vap; 996 uint8_t *challenge; 997 int allocbs, estatus; 998 999 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1000 1001 /* 1002 * NB: this can happen as we allow pre-shared key 1003 * authentication to be enabled w/o wep being turned 1004 * on so that configuration of these can be done 1005 * in any order. It may be better to enforce the 1006 * ordering in which case this check would just be 1007 * for sanity/consistency. 1008 */ 1009 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1010 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1011 ni->ni_macaddr, "shared key auth", 1012 "%s", " PRIVACY is disabled"); 1013 estatus = IEEE80211_STATUS_ALG; 1014 goto bad; 1015 } 1016 /* 1017 * Pre-shared key authentication is evil; accept 1018 * it only if explicitly configured (it is supported 1019 * mainly for compatibility with clients like Mac OS X). 1020 */ 1021 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1022 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1023 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1024 ni->ni_macaddr, "shared key auth", 1025 "bad sta auth mode %u", ni->ni_authmode); 1026 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1027 estatus = IEEE80211_STATUS_ALG; 1028 goto bad; 1029 } 1030 1031 challenge = NULL; 1032 if (frm + 1 < efrm) { 1033 if ((frm[1] + 2) > (efrm - frm)) { 1034 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1035 ni->ni_macaddr, "shared key auth", 1036 "ie %d/%d too long", 1037 frm[0], (frm[1] + 2) - (efrm - frm)); 1038 vap->iv_stats.is_rx_bad_auth++; 1039 estatus = IEEE80211_STATUS_CHALLENGE; 1040 goto bad; 1041 } 1042 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1043 challenge = frm; 1044 frm += frm[1] + 2; 1045 } 1046 switch (seq) { 1047 case IEEE80211_AUTH_SHARED_CHALLENGE: 1048 case IEEE80211_AUTH_SHARED_RESPONSE: 1049 if (challenge == NULL) { 1050 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1051 ni->ni_macaddr, "shared key auth", 1052 "%s", "no challenge"); 1053 vap->iv_stats.is_rx_bad_auth++; 1054 estatus = IEEE80211_STATUS_CHALLENGE; 1055 goto bad; 1056 } 1057 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1058 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1059 ni->ni_macaddr, "shared key auth", 1060 "bad challenge len %d", challenge[1]); 1061 vap->iv_stats.is_rx_bad_auth++; 1062 estatus = IEEE80211_STATUS_CHALLENGE; 1063 goto bad; 1064 } 1065 default: 1066 break; 1067 } 1068 switch (seq) { 1069 case IEEE80211_AUTH_SHARED_REQUEST: 1070 if (ni == vap->iv_bss) { 1071 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1072 if (ni == NULL) { 1073 /* NB: no way to return an error */ 1074 return; 1075 } 1076 allocbs = 1; 1077 } else { 1078 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1079 (void) ieee80211_ref_node(ni); 1080 allocbs = 0; 1081 } 1082 /* 1083 * Mark the node as referenced to reflect that it's 1084 * reference count has been bumped to insure it remains 1085 * after the transaction completes. 1086 */ 1087 ni->ni_flags |= IEEE80211_NODE_AREF; 1088 /* 1089 * Mark the node as requiring a valid associatio id 1090 * before outbound traffic is permitted. 1091 */ 1092 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1093 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1094 ni->ni_noise = nf; 1095 if (!ieee80211_alloc_challenge(ni)) { 1096 /* NB: don't return error so they rexmit */ 1097 return; 1098 } 1099 get_random_bytes(ni->ni_challenge, 1100 IEEE80211_CHALLENGE_LEN); 1101 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1102 ni, "shared key %sauth request", allocbs ? "" : "re"); 1103 /* 1104 * When the ACL policy is set to RADIUS we defer the 1105 * authorization to a user agent. Dispatch an event, 1106 * a subsequent MLME call will decide the fate of the 1107 * station. If the user agent is not present then the 1108 * node will be reclaimed due to inactivity. 1109 */ 1110 if (vap->iv_acl != NULL && 1111 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1112 IEEE80211_NOTE_MAC(vap, 1113 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1114 ni->ni_macaddr, 1115 "%s", "station authentication defered (radius acl)"); 1116 ieee80211_notify_node_auth(ni); 1117 return; 1118 } 1119 break; 1120 case IEEE80211_AUTH_SHARED_RESPONSE: 1121 if (ni == vap->iv_bss) { 1122 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1123 ni->ni_macaddr, "shared key response", 1124 "%s", "unknown station"); 1125 /* NB: don't send a response */ 1126 return; 1127 } 1128 if (ni->ni_challenge == NULL) { 1129 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1130 ni->ni_macaddr, "shared key response", 1131 "%s", "no challenge recorded"); 1132 vap->iv_stats.is_rx_bad_auth++; 1133 estatus = IEEE80211_STATUS_CHALLENGE; 1134 goto bad; 1135 } 1136 if (memcmp(ni->ni_challenge, &challenge[2], 1137 challenge[1]) != 0) { 1138 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1139 ni->ni_macaddr, "shared key response", 1140 "%s", "challenge mismatch"); 1141 vap->iv_stats.is_rx_auth_fail++; 1142 estatus = IEEE80211_STATUS_CHALLENGE; 1143 goto bad; 1144 } 1145 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1146 ni, "%s", "station authenticated (shared key)"); 1147 ieee80211_node_authorize(ni); 1148 break; 1149 default: 1150 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1151 ni->ni_macaddr, "shared key auth", 1152 "bad seq %d", seq); 1153 vap->iv_stats.is_rx_bad_auth++; 1154 estatus = IEEE80211_STATUS_SEQUENCE; 1155 goto bad; 1156 } 1157 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1158 return; 1159 bad: 1160 /* 1161 * Send an error response; but only when operating as an AP. 1162 */ 1163 /* XXX hack to workaround calling convention */ 1164 ieee80211_send_error(ni, wh->i_addr2, 1165 IEEE80211_FC0_SUBTYPE_AUTH, 1166 (seq + 1) | (estatus<<16)); 1167 } 1168 1169 /* 1170 * Convert a WPA cipher selector OUI to an internal 1171 * cipher algorithm. Where appropriate we also 1172 * record any key length. 1173 */ 1174 static int 1175 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1176 { 1177 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1178 uint32_t w = LE_READ_4(sel); 1179 1180 switch (w) { 1181 case WPA_SEL(WPA_CSE_NULL): 1182 return IEEE80211_CIPHER_NONE; 1183 case WPA_SEL(WPA_CSE_WEP40): 1184 if (keylen) 1185 *keylen = 40 / NBBY; 1186 return IEEE80211_CIPHER_WEP; 1187 case WPA_SEL(WPA_CSE_WEP104): 1188 if (keylen) 1189 *keylen = 104 / NBBY; 1190 return IEEE80211_CIPHER_WEP; 1191 case WPA_SEL(WPA_CSE_TKIP): 1192 return IEEE80211_CIPHER_TKIP; 1193 case WPA_SEL(WPA_CSE_CCMP): 1194 return IEEE80211_CIPHER_AES_CCM; 1195 } 1196 return 32; /* NB: so 1<< is discarded */ 1197 #undef WPA_SEL 1198 } 1199 1200 /* 1201 * Convert a WPA key management/authentication algorithm 1202 * to an internal code. 1203 */ 1204 static int 1205 wpa_keymgmt(const uint8_t *sel) 1206 { 1207 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1208 uint32_t w = LE_READ_4(sel); 1209 1210 switch (w) { 1211 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1212 return WPA_ASE_8021X_UNSPEC; 1213 case WPA_SEL(WPA_ASE_8021X_PSK): 1214 return WPA_ASE_8021X_PSK; 1215 case WPA_SEL(WPA_ASE_NONE): 1216 return WPA_ASE_NONE; 1217 } 1218 return 0; /* NB: so is discarded */ 1219 #undef WPA_SEL 1220 } 1221 1222 /* 1223 * Parse a WPA information element to collect parameters. 1224 * Note that we do not validate security parameters; that 1225 * is handled by the authenticator; the parsing done here 1226 * is just for internal use in making operational decisions. 1227 */ 1228 static int 1229 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1230 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1231 { 1232 uint8_t len = frm[1]; 1233 uint32_t w; 1234 int n; 1235 1236 /* 1237 * Check the length once for fixed parts: OUI, type, 1238 * version, mcast cipher, and 2 selector counts. 1239 * Other, variable-length data, must be checked separately. 1240 */ 1241 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1242 IEEE80211_DISCARD_IE(vap, 1243 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1244 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1245 return IEEE80211_REASON_IE_INVALID; 1246 } 1247 if (len < 14) { 1248 IEEE80211_DISCARD_IE(vap, 1249 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1250 wh, "WPA", "too short, len %u", len); 1251 return IEEE80211_REASON_IE_INVALID; 1252 } 1253 frm += 6, len -= 4; /* NB: len is payload only */ 1254 /* NB: iswpaoui already validated the OUI and type */ 1255 w = LE_READ_2(frm); 1256 if (w != WPA_VERSION) { 1257 IEEE80211_DISCARD_IE(vap, 1258 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1259 wh, "WPA", "bad version %u", w); 1260 return IEEE80211_REASON_IE_INVALID; 1261 } 1262 frm += 2, len -= 2; 1263 1264 memset(rsn, 0, sizeof(*rsn)); 1265 1266 /* multicast/group cipher */ 1267 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1268 frm += 4, len -= 4; 1269 1270 /* unicast ciphers */ 1271 n = LE_READ_2(frm); 1272 frm += 2, len -= 2; 1273 if (len < n*4+2) { 1274 IEEE80211_DISCARD_IE(vap, 1275 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1276 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1277 len, n); 1278 return IEEE80211_REASON_IE_INVALID; 1279 } 1280 w = 0; 1281 for (; n > 0; n--) { 1282 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1283 frm += 4, len -= 4; 1284 } 1285 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1286 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1287 else 1288 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1289 1290 /* key management algorithms */ 1291 n = LE_READ_2(frm); 1292 frm += 2, len -= 2; 1293 if (len < n*4) { 1294 IEEE80211_DISCARD_IE(vap, 1295 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1296 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1297 len, n); 1298 return IEEE80211_REASON_IE_INVALID; 1299 } 1300 w = 0; 1301 for (; n > 0; n--) { 1302 w |= wpa_keymgmt(frm); 1303 frm += 4, len -= 4; 1304 } 1305 if (w & WPA_ASE_8021X_UNSPEC) 1306 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1307 else 1308 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1309 1310 if (len > 2) /* optional capabilities */ 1311 rsn->rsn_caps = LE_READ_2(frm); 1312 1313 return 0; 1314 } 1315 1316 /* 1317 * Convert an RSN cipher selector OUI to an internal 1318 * cipher algorithm. Where appropriate we also 1319 * record any key length. 1320 */ 1321 static int 1322 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1323 { 1324 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1325 uint32_t w = LE_READ_4(sel); 1326 1327 switch (w) { 1328 case RSN_SEL(RSN_CSE_NULL): 1329 return IEEE80211_CIPHER_NONE; 1330 case RSN_SEL(RSN_CSE_WEP40): 1331 if (keylen) 1332 *keylen = 40 / NBBY; 1333 return IEEE80211_CIPHER_WEP; 1334 case RSN_SEL(RSN_CSE_WEP104): 1335 if (keylen) 1336 *keylen = 104 / NBBY; 1337 return IEEE80211_CIPHER_WEP; 1338 case RSN_SEL(RSN_CSE_TKIP): 1339 return IEEE80211_CIPHER_TKIP; 1340 case RSN_SEL(RSN_CSE_CCMP): 1341 return IEEE80211_CIPHER_AES_CCM; 1342 case RSN_SEL(RSN_CSE_WRAP): 1343 return IEEE80211_CIPHER_AES_OCB; 1344 } 1345 return 32; /* NB: so 1<< is discarded */ 1346 #undef WPA_SEL 1347 } 1348 1349 /* 1350 * Convert an RSN key management/authentication algorithm 1351 * to an internal code. 1352 */ 1353 static int 1354 rsn_keymgmt(const uint8_t *sel) 1355 { 1356 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1357 uint32_t w = LE_READ_4(sel); 1358 1359 switch (w) { 1360 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1361 return RSN_ASE_8021X_UNSPEC; 1362 case RSN_SEL(RSN_ASE_8021X_PSK): 1363 return RSN_ASE_8021X_PSK; 1364 case RSN_SEL(RSN_ASE_NONE): 1365 return RSN_ASE_NONE; 1366 } 1367 return 0; /* NB: so is discarded */ 1368 #undef RSN_SEL 1369 } 1370 1371 /* 1372 * Parse a WPA/RSN information element to collect parameters 1373 * and validate the parameters against what has been 1374 * configured for the system. 1375 */ 1376 static int 1377 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1378 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1379 { 1380 uint8_t len = frm[1]; 1381 uint32_t w; 1382 int n; 1383 1384 /* 1385 * Check the length once for fixed parts: 1386 * version, mcast cipher, and 2 selector counts. 1387 * Other, variable-length data, must be checked separately. 1388 */ 1389 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1390 IEEE80211_DISCARD_IE(vap, 1391 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1392 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1393 return IEEE80211_REASON_IE_INVALID; 1394 } 1395 if (len < 10) { 1396 IEEE80211_DISCARD_IE(vap, 1397 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1398 wh, "RSN", "too short, len %u", len); 1399 return IEEE80211_REASON_IE_INVALID; 1400 } 1401 frm += 2; 1402 w = LE_READ_2(frm); 1403 if (w != RSN_VERSION) { 1404 IEEE80211_DISCARD_IE(vap, 1405 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1406 wh, "RSN", "bad version %u", w); 1407 return IEEE80211_REASON_IE_INVALID; 1408 } 1409 frm += 2, len -= 2; 1410 1411 memset(rsn, 0, sizeof(*rsn)); 1412 1413 /* multicast/group cipher */ 1414 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1415 frm += 4, len -= 4; 1416 1417 /* unicast ciphers */ 1418 n = LE_READ_2(frm); 1419 frm += 2, len -= 2; 1420 if (len < n*4+2) { 1421 IEEE80211_DISCARD_IE(vap, 1422 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1423 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1424 len, n); 1425 return IEEE80211_REASON_IE_INVALID; 1426 } 1427 w = 0; 1428 for (; n > 0; n--) { 1429 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1430 frm += 4, len -= 4; 1431 } 1432 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1433 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1434 else 1435 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1436 1437 /* key management algorithms */ 1438 n = LE_READ_2(frm); 1439 frm += 2, len -= 2; 1440 if (len < n*4) { 1441 IEEE80211_DISCARD_IE(vap, 1442 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1443 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1444 len, n); 1445 return IEEE80211_REASON_IE_INVALID; 1446 } 1447 w = 0; 1448 for (; n > 0; n--) { 1449 w |= rsn_keymgmt(frm); 1450 frm += 4, len -= 4; 1451 } 1452 if (w & RSN_ASE_8021X_UNSPEC) 1453 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1454 else 1455 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1456 1457 /* optional RSN capabilities */ 1458 if (len > 2) 1459 rsn->rsn_caps = LE_READ_2(frm); 1460 /* XXXPMKID */ 1461 1462 return 0; 1463 } 1464 1465 /* 1466 * WPA/802.11i assocation request processing. 1467 */ 1468 static int 1469 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1470 const struct ieee80211_frame *wh, const uint8_t *wpa, 1471 const uint8_t *rsn, uint16_t capinfo) 1472 { 1473 struct ieee80211vap *vap = ni->ni_vap; 1474 uint8_t reason; 1475 int badwparsn; 1476 1477 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1478 if (wpa == NULL && rsn == NULL) { 1479 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1480 /* 1481 * W-Fi Protected Setup (WPS) permits 1482 * clients to associate and pass EAPOL frames 1483 * to establish initial credentials. 1484 */ 1485 ni->ni_flags |= IEEE80211_NODE_WPS; 1486 return 1; 1487 } 1488 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1489 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1490 /* 1491 * Transitional Security Network. Permits clients 1492 * to associate and use WEP while WPA is configured. 1493 */ 1494 ni->ni_flags |= IEEE80211_NODE_TSN; 1495 return 1; 1496 } 1497 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1498 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1499 vap->iv_stats.is_rx_assoc_badwpaie++; 1500 reason = IEEE80211_REASON_IE_INVALID; 1501 goto bad; 1502 } 1503 /* assert right association security credentials */ 1504 badwparsn = 0; /* NB: to silence compiler */ 1505 switch (vap->iv_flags & IEEE80211_F_WPA) { 1506 case IEEE80211_F_WPA1: 1507 badwparsn = (wpa == NULL); 1508 break; 1509 case IEEE80211_F_WPA2: 1510 badwparsn = (rsn == NULL); 1511 break; 1512 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1513 badwparsn = (wpa == NULL && rsn == NULL); 1514 break; 1515 } 1516 if (badwparsn) { 1517 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1518 wh, NULL, 1519 "%s", "missing WPA/RSN IE in association request"); 1520 vap->iv_stats.is_rx_assoc_badwpaie++; 1521 reason = IEEE80211_REASON_IE_INVALID; 1522 goto bad; 1523 } 1524 /* 1525 * Parse WPA/RSN information element. 1526 */ 1527 if (wpa != NULL) 1528 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1529 else 1530 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1531 if (reason != 0) { 1532 /* XXX distinguish WPA/RSN? */ 1533 vap->iv_stats.is_rx_assoc_badwpaie++; 1534 goto bad; 1535 } 1536 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1537 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1538 wpa != NULL ? "WPA" : "RSN", 1539 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1540 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1541 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1542 1543 return 1; 1544 bad: 1545 ieee80211_node_deauth(ni, reason); 1546 return 0; 1547 } 1548 1549 /* XXX find a better place for definition */ 1550 struct l2_update_frame { 1551 struct ether_header eh; 1552 uint8_t dsap; 1553 uint8_t ssap; 1554 uint8_t control; 1555 uint8_t xid[3]; 1556 } __packed; 1557 1558 /* 1559 * Deliver a TGf L2UF frame on behalf of a station. 1560 * This primes any bridge when the station is roaming 1561 * between ap's on the same wired network. 1562 */ 1563 static void 1564 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1565 { 1566 struct ieee80211vap *vap = ni->ni_vap; 1567 struct ifnet *ifp = vap->iv_ifp; 1568 struct mbuf *m; 1569 struct l2_update_frame *l2uf; 1570 struct ether_header *eh; 1571 1572 m = m_gethdr(M_NOWAIT, MT_DATA); 1573 if (m == NULL) { 1574 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1575 "%s", "no mbuf for l2uf frame"); 1576 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1577 return; 1578 } 1579 l2uf = mtod(m, struct l2_update_frame *); 1580 eh = &l2uf->eh; 1581 /* dst: Broadcast address */ 1582 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1583 /* src: associated STA */ 1584 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1585 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1586 1587 l2uf->dsap = 0; 1588 l2uf->ssap = 0; 1589 l2uf->control = 0xf5; 1590 l2uf->xid[0] = 0x81; 1591 l2uf->xid[1] = 0x80; 1592 l2uf->xid[2] = 0x00; 1593 1594 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1595 hostap_deliver_data(vap, ni, m); 1596 } 1597 1598 static void 1599 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1600 int reassoc, int resp, const char *tag, int rate) 1601 { 1602 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1603 "deny %s request, %s rate set mismatch, rate/MCS %d", 1604 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1605 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1606 ieee80211_node_leave(ni); 1607 } 1608 1609 static void 1610 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1611 int reassoc, int resp, const char *tag, int capinfo) 1612 { 1613 struct ieee80211vap *vap = ni->ni_vap; 1614 1615 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1616 "deny %s request, %s mismatch 0x%x", 1617 reassoc ? "reassoc" : "assoc", tag, capinfo); 1618 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1619 ieee80211_node_leave(ni); 1620 vap->iv_stats.is_rx_assoc_capmismatch++; 1621 } 1622 1623 static void 1624 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1625 int reassoc, int resp) 1626 { 1627 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1628 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1629 /* XXX no better code */ 1630 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1631 ieee80211_node_leave(ni); 1632 } 1633 1634 static void 1635 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1636 int algo, int seq, int status) 1637 { 1638 struct ieee80211vap *vap = ni->ni_vap; 1639 1640 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1641 wh, NULL, "unsupported alg %d", algo); 1642 vap->iv_stats.is_rx_auth_unsupported++; 1643 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1644 seq | (status << 16)); 1645 } 1646 1647 static __inline int 1648 ishtmixed(const uint8_t *ie) 1649 { 1650 const struct ieee80211_ie_htinfo *ht = 1651 (const struct ieee80211_ie_htinfo *) ie; 1652 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1653 IEEE80211_HTINFO_OPMODE_MIXED; 1654 } 1655 1656 static int 1657 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1658 { 1659 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1660 int i; 1661 1662 /* NB: the 11b clients we care about will not have xrates */ 1663 if (xrates != NULL || rates == NULL) 1664 return 0; 1665 for (i = 0; i < rates[1]; i++) { 1666 int r = rates[2+i] & IEEE80211_RATE_VAL; 1667 if (r > 2*11 || ((1<<r) & brates) == 0) 1668 return 0; 1669 } 1670 return 1; 1671 } 1672 1673 static void 1674 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1675 int subtype, int rssi, int nf) 1676 { 1677 struct ieee80211vap *vap = ni->ni_vap; 1678 struct ieee80211com *ic = ni->ni_ic; 1679 struct ieee80211_frame *wh; 1680 uint8_t *frm, *efrm, *sfrm; 1681 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1682 int reassoc, resp; 1683 uint8_t rate; 1684 1685 wh = mtod(m0, struct ieee80211_frame *); 1686 frm = (uint8_t *)&wh[1]; 1687 efrm = mtod(m0, uint8_t *) + m0->m_len; 1688 switch (subtype) { 1689 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1690 case IEEE80211_FC0_SUBTYPE_BEACON: { 1691 struct ieee80211_scanparams scan; 1692 /* 1693 * We process beacon/probe response frames when scanning; 1694 * otherwise we check beacon frames for overlapping non-ERP 1695 * BSS in 11g and/or overlapping legacy BSS when in HT. 1696 */ 1697 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1698 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1699 vap->iv_stats.is_rx_mgtdiscard++; 1700 return; 1701 } 1702 /* NB: accept off-channel frames */ 1703 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1704 return; 1705 /* 1706 * Count frame now that we know it's to be processed. 1707 */ 1708 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1709 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1710 IEEE80211_NODE_STAT(ni, rx_beacons); 1711 } else 1712 IEEE80211_NODE_STAT(ni, rx_proberesp); 1713 /* 1714 * If scanning, just pass information to the scan module. 1715 */ 1716 if (ic->ic_flags & IEEE80211_F_SCAN) { 1717 if (scan.status == 0 && /* NB: on channel */ 1718 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1719 /* 1720 * Actively scanning a channel marked passive; 1721 * send a probe request now that we know there 1722 * is 802.11 traffic present. 1723 * 1724 * XXX check if the beacon we recv'd gives 1725 * us what we need and suppress the probe req 1726 */ 1727 ieee80211_probe_curchan(vap, 1); 1728 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1729 } 1730 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1731 return; 1732 } 1733 /* 1734 * Check beacon for overlapping bss w/ non ERP stations. 1735 * If we detect one and protection is configured but not 1736 * enabled, enable it and start a timer that'll bring us 1737 * out if we stop seeing the bss. 1738 */ 1739 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1740 scan.status == 0 && /* NB: on-channel */ 1741 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1742 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1743 ic->ic_lastnonerp = ticks; 1744 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1745 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1746 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1747 IEEE80211_NOTE_FRAME(vap, 1748 IEEE80211_MSG_ASSOC, wh, 1749 "non-ERP present on channel %d " 1750 "(saw erp 0x%x from channel %d), " 1751 "enable use of protection", 1752 ic->ic_curchan->ic_ieee, 1753 scan.erp, scan.chan); 1754 ic->ic_flags |= IEEE80211_F_USEPROT; 1755 ieee80211_notify_erp(ic); 1756 } 1757 } 1758 /* 1759 * Check beacon for non-HT station on HT channel 1760 * and update HT BSS occupancy as appropriate. 1761 */ 1762 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1763 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1764 /* 1765 * Off control channel; only check frames 1766 * that come in the extension channel when 1767 * operating w/ HT40. 1768 */ 1769 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1770 break; 1771 if (scan.chan != ic->ic_curchan->ic_extieee) 1772 break; 1773 } 1774 if (scan.htinfo == NULL) { 1775 ieee80211_htprot_update(ic, 1776 IEEE80211_HTINFO_OPMODE_PROTOPT | 1777 IEEE80211_HTINFO_NONHT_PRESENT); 1778 } else if (ishtmixed(scan.htinfo)) { 1779 /* XXX? take NONHT_PRESENT from beacon? */ 1780 ieee80211_htprot_update(ic, 1781 IEEE80211_HTINFO_OPMODE_MIXED | 1782 IEEE80211_HTINFO_NONHT_PRESENT); 1783 } 1784 } 1785 break; 1786 } 1787 1788 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1789 if (vap->iv_state != IEEE80211_S_RUN) { 1790 vap->iv_stats.is_rx_mgtdiscard++; 1791 return; 1792 } 1793 /* 1794 * prreq frame format 1795 * [tlv] ssid 1796 * [tlv] supported rates 1797 * [tlv] extended supported rates 1798 */ 1799 ssid = rates = xrates = NULL; 1800 sfrm = frm; 1801 while (efrm - frm > 1) { 1802 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1803 switch (*frm) { 1804 case IEEE80211_ELEMID_SSID: 1805 ssid = frm; 1806 break; 1807 case IEEE80211_ELEMID_RATES: 1808 rates = frm; 1809 break; 1810 case IEEE80211_ELEMID_XRATES: 1811 xrates = frm; 1812 break; 1813 } 1814 frm += frm[1] + 2; 1815 } 1816 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1817 if (xrates != NULL) 1818 IEEE80211_VERIFY_ELEMENT(xrates, 1819 IEEE80211_RATE_MAXSIZE - rates[1], return); 1820 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1821 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1822 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1823 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1824 wh, NULL, 1825 "%s", "no ssid with ssid suppression enabled"); 1826 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1827 return; 1828 } 1829 1830 /* XXX find a better class or define it's own */ 1831 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1832 "%s", "recv probe req"); 1833 /* 1834 * Some legacy 11b clients cannot hack a complete 1835 * probe response frame. When the request includes 1836 * only a bare-bones rate set, communicate this to 1837 * the transmit side. 1838 */ 1839 ieee80211_send_proberesp(vap, wh->i_addr2, 1840 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1841 break; 1842 1843 case IEEE80211_FC0_SUBTYPE_AUTH: { 1844 uint16_t algo, seq, status; 1845 1846 if (vap->iv_state != IEEE80211_S_RUN) { 1847 vap->iv_stats.is_rx_mgtdiscard++; 1848 return; 1849 } 1850 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1851 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1852 wh, NULL, "%s", "wrong bssid"); 1853 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1854 return; 1855 } 1856 /* 1857 * auth frame format 1858 * [2] algorithm 1859 * [2] sequence 1860 * [2] status 1861 * [tlv*] challenge 1862 */ 1863 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1864 algo = le16toh(*(uint16_t *)frm); 1865 seq = le16toh(*(uint16_t *)(frm + 2)); 1866 status = le16toh(*(uint16_t *)(frm + 4)); 1867 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1868 "recv auth frame with algorithm %d seq %d", algo, seq); 1869 /* 1870 * Consult the ACL policy module if setup. 1871 */ 1872 if (vap->iv_acl != NULL && 1873 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1874 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1875 wh, NULL, "%s", "disallowed by ACL"); 1876 vap->iv_stats.is_rx_acl++; 1877 ieee80211_send_error(ni, wh->i_addr2, 1878 IEEE80211_FC0_SUBTYPE_AUTH, 1879 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1880 return; 1881 } 1882 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1883 IEEE80211_DISCARD(vap, 1884 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1885 wh, NULL, "%s", "TKIP countermeasures enabled"); 1886 vap->iv_stats.is_rx_auth_countermeasures++; 1887 ieee80211_send_error(ni, wh->i_addr2, 1888 IEEE80211_FC0_SUBTYPE_AUTH, 1889 IEEE80211_REASON_MIC_FAILURE); 1890 return; 1891 } 1892 if (algo == IEEE80211_AUTH_ALG_SHARED) 1893 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1894 seq, status); 1895 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1896 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1897 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1898 authalgreject(ni, wh, algo, 1899 seq+1, IEEE80211_STATUS_ALG); 1900 return; 1901 } else { 1902 /* 1903 * We assume that an unknown algorithm is the result 1904 * of a decryption failure on a shared key auth frame; 1905 * return a status code appropriate for that instead 1906 * of IEEE80211_STATUS_ALG. 1907 * 1908 * NB: a seq# of 4 is intentional; the decrypted 1909 * frame likely has a bogus seq value. 1910 */ 1911 authalgreject(ni, wh, algo, 1912 4, IEEE80211_STATUS_CHALLENGE); 1913 return; 1914 } 1915 break; 1916 } 1917 1918 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1919 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1920 uint16_t capinfo, lintval; 1921 struct ieee80211_rsnparms rsnparms; 1922 1923 if (vap->iv_state != IEEE80211_S_RUN) { 1924 vap->iv_stats.is_rx_mgtdiscard++; 1925 return; 1926 } 1927 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1928 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1929 wh, NULL, "%s", "wrong bssid"); 1930 vap->iv_stats.is_rx_assoc_bss++; 1931 return; 1932 } 1933 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1934 reassoc = 1; 1935 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1936 } else { 1937 reassoc = 0; 1938 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1939 } 1940 if (ni == vap->iv_bss) { 1941 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1942 "deny %s request, sta not authenticated", 1943 reassoc ? "reassoc" : "assoc"); 1944 ieee80211_send_error(ni, wh->i_addr2, 1945 IEEE80211_FC0_SUBTYPE_DEAUTH, 1946 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1947 vap->iv_stats.is_rx_assoc_notauth++; 1948 return; 1949 } 1950 1951 /* 1952 * asreq frame format 1953 * [2] capability information 1954 * [2] listen interval 1955 * [6*] current AP address (reassoc only) 1956 * [tlv] ssid 1957 * [tlv] supported rates 1958 * [tlv] extended supported rates 1959 * [tlv] WPA or RSN 1960 * [tlv] HT capabilities 1961 * [tlv] Atheros capabilities 1962 */ 1963 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1964 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1965 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1966 if (reassoc) 1967 frm += 6; /* ignore current AP info */ 1968 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1969 sfrm = frm; 1970 while (efrm - frm > 1) { 1971 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1972 switch (*frm) { 1973 case IEEE80211_ELEMID_SSID: 1974 ssid = frm; 1975 break; 1976 case IEEE80211_ELEMID_RATES: 1977 rates = frm; 1978 break; 1979 case IEEE80211_ELEMID_XRATES: 1980 xrates = frm; 1981 break; 1982 case IEEE80211_ELEMID_RSN: 1983 rsn = frm; 1984 break; 1985 case IEEE80211_ELEMID_HTCAP: 1986 htcap = frm; 1987 break; 1988 case IEEE80211_ELEMID_VENDOR: 1989 if (iswpaoui(frm)) 1990 wpa = frm; 1991 else if (iswmeinfo(frm)) 1992 wme = frm; 1993 #ifdef IEEE80211_SUPPORT_SUPERG 1994 else if (isatherosoui(frm)) 1995 ath = frm; 1996 #endif 1997 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1998 if (ishtcapoui(frm) && htcap == NULL) 1999 htcap = frm; 2000 } 2001 break; 2002 } 2003 frm += frm[1] + 2; 2004 } 2005 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2006 if (xrates != NULL) 2007 IEEE80211_VERIFY_ELEMENT(xrates, 2008 IEEE80211_RATE_MAXSIZE - rates[1], return); 2009 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2010 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2011 if (htcap != NULL) { 2012 IEEE80211_VERIFY_LENGTH(htcap[1], 2013 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2014 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2015 sizeof(struct ieee80211_ie_htcap)-2, 2016 return); /* XXX just NULL out? */ 2017 } 2018 2019 if ((vap->iv_flags & IEEE80211_F_WPA) && 2020 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2021 return; 2022 /* discard challenge after association */ 2023 if (ni->ni_challenge != NULL) { 2024 free(ni->ni_challenge, M_80211_NODE); 2025 ni->ni_challenge = NULL; 2026 } 2027 /* NB: 802.11 spec says to ignore station's privacy bit */ 2028 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2029 capinfomismatch(ni, wh, reassoc, resp, 2030 "capability", capinfo); 2031 return; 2032 } 2033 /* 2034 * Disallow re-associate w/ invalid slot time setting. 2035 */ 2036 if (ni->ni_associd != 0 && 2037 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2038 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2039 capinfomismatch(ni, wh, reassoc, resp, 2040 "slot time", capinfo); 2041 return; 2042 } 2043 rate = ieee80211_setup_rates(ni, rates, xrates, 2044 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2045 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2046 if (rate & IEEE80211_RATE_BASIC) { 2047 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2048 vap->iv_stats.is_rx_assoc_norate++; 2049 return; 2050 } 2051 /* 2052 * If constrained to 11g-only stations reject an 2053 * 11b-only station. We cheat a bit here by looking 2054 * at the max negotiated xmit rate and assuming anyone 2055 * with a best rate <24Mb/s is an 11b station. 2056 */ 2057 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2058 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2059 vap->iv_stats.is_rx_assoc_norate++; 2060 return; 2061 } 2062 /* 2063 * Do HT rate set handling and setup HT node state. 2064 */ 2065 ni->ni_chan = vap->iv_bss->ni_chan; 2066 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2067 rate = ieee80211_setup_htrates(ni, htcap, 2068 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2069 IEEE80211_F_DOBRS); 2070 if (rate & IEEE80211_RATE_BASIC) { 2071 ratesetmismatch(ni, wh, reassoc, resp, 2072 "HT", rate); 2073 vap->iv_stats.is_ht_assoc_norate++; 2074 return; 2075 } 2076 ieee80211_ht_node_init(ni); 2077 ieee80211_ht_updatehtcap(ni, htcap); 2078 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2079 ieee80211_ht_node_cleanup(ni); 2080 #ifdef IEEE80211_SUPPORT_SUPERG 2081 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2082 ieee80211_ff_node_cleanup(ni); 2083 #endif 2084 /* 2085 * Allow AMPDU operation only with unencrypted traffic 2086 * or AES-CCM; the 11n spec only specifies these ciphers 2087 * so permitting any others is undefined and can lead 2088 * to interoperability problems. 2089 */ 2090 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2091 (((vap->iv_flags & IEEE80211_F_WPA) && 2092 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2093 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2094 IEEE80211_NOTE(vap, 2095 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2096 "disallow HT use because WEP or TKIP requested, " 2097 "capinfo 0x%x ucastcipher %d", capinfo, 2098 rsnparms.rsn_ucastcipher); 2099 ieee80211_ht_node_cleanup(ni); 2100 vap->iv_stats.is_ht_assoc_downgrade++; 2101 } 2102 /* 2103 * If constrained to 11n-only stations reject legacy stations. 2104 */ 2105 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2106 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2107 htcapmismatch(ni, wh, reassoc, resp); 2108 vap->iv_stats.is_ht_assoc_nohtcap++; 2109 return; 2110 } 2111 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2112 ni->ni_noise = nf; 2113 ni->ni_intval = lintval; 2114 ni->ni_capinfo = capinfo; 2115 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2116 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2117 /* 2118 * Store the IEs. 2119 * XXX maybe better to just expand 2120 */ 2121 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2122 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2123 if (wpa != NULL) 2124 setie(wpa_ie, wpa - sfrm); 2125 if (rsn != NULL) 2126 setie(rsn_ie, rsn - sfrm); 2127 if (htcap != NULL) 2128 setie(htcap_ie, htcap - sfrm); 2129 if (wme != NULL) { 2130 setie(wme_ie, wme - sfrm); 2131 /* 2132 * Mark node as capable of QoS. 2133 */ 2134 ni->ni_flags |= IEEE80211_NODE_QOS; 2135 } else 2136 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2137 #ifdef IEEE80211_SUPPORT_SUPERG 2138 if (ath != NULL) { 2139 setie(ath_ie, ath - sfrm); 2140 /* 2141 * Parse ATH station parameters. 2142 */ 2143 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2144 } else 2145 #endif 2146 ni->ni_ath_flags = 0; 2147 #undef setie 2148 } else { 2149 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2150 ni->ni_ath_flags = 0; 2151 } 2152 ieee80211_node_join(ni, resp); 2153 ieee80211_deliver_l2uf(ni); 2154 break; 2155 } 2156 2157 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2158 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2159 uint16_t reason; 2160 2161 if (vap->iv_state != IEEE80211_S_RUN || 2162 /* NB: can happen when in promiscuous mode */ 2163 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2164 vap->iv_stats.is_rx_mgtdiscard++; 2165 break; 2166 } 2167 /* 2168 * deauth/disassoc frame format 2169 * [2] reason 2170 */ 2171 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2172 reason = le16toh(*(uint16_t *)frm); 2173 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2174 vap->iv_stats.is_rx_deauth++; 2175 IEEE80211_NODE_STAT(ni, rx_deauth); 2176 } else { 2177 vap->iv_stats.is_rx_disassoc++; 2178 IEEE80211_NODE_STAT(ni, rx_disassoc); 2179 } 2180 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2181 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2182 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2183 if (ni != vap->iv_bss) 2184 ieee80211_node_leave(ni); 2185 break; 2186 } 2187 2188 case IEEE80211_FC0_SUBTYPE_ACTION: 2189 if (vap->iv_state == IEEE80211_S_RUN) { 2190 if (ieee80211_parse_action(ni, m0) == 0) 2191 ic->ic_recv_action(ni, wh, frm, efrm); 2192 } else 2193 vap->iv_stats.is_rx_mgtdiscard++; 2194 break; 2195 2196 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2197 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2198 default: 2199 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2200 wh, "mgt", "subtype 0x%x not handled", subtype); 2201 vap->iv_stats.is_rx_badsubtype++; 2202 break; 2203 } 2204 } 2205 2206 static void 2207 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2208 { 2209 switch (subtype) { 2210 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2211 hostap_recv_pspoll(ni, m); 2212 break; 2213 case IEEE80211_FC0_SUBTYPE_BAR: 2214 ieee80211_recv_bar(ni, m); 2215 break; 2216 } 2217 } 2218 2219 /* 2220 * Process a received ps-poll frame. 2221 */ 2222 static void 2223 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2224 { 2225 struct ieee80211vap *vap = ni->ni_vap; 2226 struct ieee80211_frame_min *wh; 2227 struct ifnet *ifp; 2228 struct mbuf *m; 2229 uint16_t aid; 2230 int qlen; 2231 2232 wh = mtod(m0, struct ieee80211_frame_min *); 2233 if (ni->ni_associd == 0) { 2234 IEEE80211_DISCARD(vap, 2235 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2236 (struct ieee80211_frame *) wh, NULL, 2237 "%s", "unassociated station"); 2238 vap->iv_stats.is_ps_unassoc++; 2239 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2240 IEEE80211_REASON_NOT_ASSOCED); 2241 return; 2242 } 2243 2244 aid = le16toh(*(uint16_t *)wh->i_dur); 2245 if (aid != ni->ni_associd) { 2246 IEEE80211_DISCARD(vap, 2247 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2248 (struct ieee80211_frame *) wh, NULL, 2249 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2250 ni->ni_associd, aid); 2251 vap->iv_stats.is_ps_badaid++; 2252 /* 2253 * NB: We used to deauth the station but it turns out 2254 * the Blackberry Curve 8230 (and perhaps other devices) 2255 * sometimes send the wrong AID when WME is negotiated. 2256 * Being more lenient here seems ok as we already check 2257 * the station is associated and we only return frames 2258 * queued for the station (i.e. we don't use the AID). 2259 */ 2260 return; 2261 } 2262 2263 /* Okay, take the first queued packet and put it out... */ 2264 m = ieee80211_node_psq_dequeue(ni, &qlen); 2265 if (m == NULL) { 2266 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2267 "%s", "recv ps-poll, but queue empty"); 2268 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2269 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2270 if (vap->iv_set_tim != NULL) 2271 vap->iv_set_tim(ni, 0); /* just in case */ 2272 return; 2273 } 2274 /* 2275 * If there are more packets, set the more packets bit 2276 * in the packet dispatched to the station; otherwise 2277 * turn off the TIM bit. 2278 */ 2279 if (qlen != 0) { 2280 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2281 "recv ps-poll, send packet, %u still queued", qlen); 2282 m->m_flags |= M_MORE_DATA; 2283 } else { 2284 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2285 "%s", "recv ps-poll, send packet, queue empty"); 2286 if (vap->iv_set_tim != NULL) 2287 vap->iv_set_tim(ni, 0); 2288 } 2289 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2290 2291 if (m->m_flags & M_ENCAP) 2292 ifp = vap->iv_ic->ic_ifp; 2293 else 2294 ifp = vap->iv_ifp; 2295 IF_ENQUEUE(&ifp->if_snd, m); 2296 if_start(ifp); 2297 } 2298