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sys/net80211/ieee80211_hostap.c
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1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD: releng/8.1/sys/net80211/ieee80211_hostap.c 206271 2010-04-06 14:07:48Z rpaulo $"); 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; 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 need_tap = 1; /* mbuf need to be tapped. */ 509 type = -1; /* undefined */ 510 511 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 512 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 513 ni->ni_macaddr, NULL, 514 "too short (1): len %u", m->m_pkthdr.len); 515 vap->iv_stats.is_rx_tooshort++; 516 goto out; 517 } 518 /* 519 * Bit of a cheat here, we use a pointer for a 3-address 520 * frame format but don't reference fields past outside 521 * ieee80211_frame_min w/o first validating the data is 522 * present. 523 */ 524 wh = mtod(m, struct ieee80211_frame *); 525 526 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 527 IEEE80211_FC0_VERSION_0) { 528 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 529 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 530 wh->i_fc[0], wh->i_fc[1]); 531 vap->iv_stats.is_rx_badversion++; 532 goto err; 533 } 534 535 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 536 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 537 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 538 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 539 if (dir != IEEE80211_FC1_DIR_NODS) 540 bssid = wh->i_addr1; 541 else if (type == IEEE80211_FC0_TYPE_CTL) 542 bssid = wh->i_addr1; 543 else { 544 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 545 IEEE80211_DISCARD_MAC(vap, 546 IEEE80211_MSG_ANY, ni->ni_macaddr, 547 NULL, "too short (2): len %u", 548 m->m_pkthdr.len); 549 vap->iv_stats.is_rx_tooshort++; 550 goto out; 551 } 552 bssid = wh->i_addr3; 553 } 554 /* 555 * Validate the bssid. 556 */ 557 if (!(type == IEEE80211_FC0_TYPE_MGT && 558 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 559 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 560 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 561 /* not interested in */ 562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 563 bssid, NULL, "%s", "not to bss"); 564 vap->iv_stats.is_rx_wrongbss++; 565 goto out; 566 } 567 568 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 569 ni->ni_noise = nf; 570 if (HAS_SEQ(type)) { 571 uint8_t tid = ieee80211_gettid(wh); 572 if (IEEE80211_QOS_HAS_SEQ(wh) && 573 TID_TO_WME_AC(tid) >= WME_AC_VI) 574 ic->ic_wme.wme_hipri_traffic++; 575 rxseq = le16toh(*(uint16_t *)wh->i_seq); 576 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 577 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 578 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 579 /* duplicate, discard */ 580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 581 bssid, "duplicate", 582 "seqno <%u,%u> fragno <%u,%u> tid %u", 583 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 584 ni->ni_rxseqs[tid] >> 585 IEEE80211_SEQ_SEQ_SHIFT, 586 rxseq & IEEE80211_SEQ_FRAG_MASK, 587 ni->ni_rxseqs[tid] & 588 IEEE80211_SEQ_FRAG_MASK, 589 tid); 590 vap->iv_stats.is_rx_dup++; 591 IEEE80211_NODE_STAT(ni, rx_dup); 592 goto out; 593 } 594 ni->ni_rxseqs[tid] = rxseq; 595 } 596 } 597 598 switch (type) { 599 case IEEE80211_FC0_TYPE_DATA: 600 hdrspace = ieee80211_hdrspace(ic, wh); 601 if (m->m_len < hdrspace && 602 (m = m_pullup(m, hdrspace)) == NULL) { 603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 604 ni->ni_macaddr, NULL, 605 "data too short: expecting %u", hdrspace); 606 vap->iv_stats.is_rx_tooshort++; 607 goto out; /* XXX */ 608 } 609 if (!(dir == IEEE80211_FC1_DIR_TODS || 610 (dir == IEEE80211_FC1_DIR_DSTODS && 611 (vap->iv_flags & IEEE80211_F_DWDS)))) { 612 if (dir != IEEE80211_FC1_DIR_DSTODS) { 613 IEEE80211_DISCARD(vap, 614 IEEE80211_MSG_INPUT, wh, "data", 615 "incorrect dir 0x%x", dir); 616 } else { 617 IEEE80211_DISCARD(vap, 618 IEEE80211_MSG_INPUT | 619 IEEE80211_MSG_WDS, wh, 620 "4-address data", 621 "%s", "DWDS not enabled"); 622 } 623 vap->iv_stats.is_rx_wrongdir++; 624 goto out; 625 } 626 /* check if source STA is associated */ 627 if (ni == vap->iv_bss) { 628 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 629 wh, "data", "%s", "unknown src"); 630 ieee80211_send_error(ni, wh->i_addr2, 631 IEEE80211_FC0_SUBTYPE_DEAUTH, 632 IEEE80211_REASON_NOT_AUTHED); 633 vap->iv_stats.is_rx_notassoc++; 634 goto err; 635 } 636 if (ni->ni_associd == 0) { 637 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 638 wh, "data", "%s", "unassoc src"); 639 IEEE80211_SEND_MGMT(ni, 640 IEEE80211_FC0_SUBTYPE_DISASSOC, 641 IEEE80211_REASON_NOT_ASSOCED); 642 vap->iv_stats.is_rx_notassoc++; 643 goto err; 644 } 645 646 /* 647 * Check for power save state change. 648 * XXX out-of-order A-MPDU frames? 649 */ 650 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 651 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 652 ieee80211_node_pwrsave(ni, 653 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 654 /* 655 * For 4-address packets handle WDS discovery 656 * notifications. Once a WDS link is setup frames 657 * are just delivered to the WDS vap (see below). 658 */ 659 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 660 if (!ieee80211_node_is_authorized(ni)) { 661 IEEE80211_DISCARD(vap, 662 IEEE80211_MSG_INPUT | 663 IEEE80211_MSG_WDS, wh, 664 "4-address data", 665 "%s", "unauthorized port"); 666 vap->iv_stats.is_rx_unauth++; 667 IEEE80211_NODE_STAT(ni, rx_unauth); 668 goto err; 669 } 670 ieee80211_dwds_discover(ni, m); 671 return type; 672 } 673 674 /* 675 * Handle A-MPDU re-ordering. If the frame is to be 676 * processed directly then ieee80211_ampdu_reorder 677 * will return 0; otherwise it has consumed the mbuf 678 * and we should do nothing more with it. 679 */ 680 if ((m->m_flags & M_AMPDU) && 681 ieee80211_ampdu_reorder(ni, m) != 0) { 682 m = NULL; 683 goto out; 684 } 685 resubmit_ampdu: 686 687 /* 688 * Handle privacy requirements. Note that we 689 * must not be preempted from here until after 690 * we (potentially) call ieee80211_crypto_demic; 691 * otherwise we may violate assumptions in the 692 * crypto cipher modules used to do delayed update 693 * of replay sequence numbers. 694 */ 695 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 696 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 697 /* 698 * Discard encrypted frames when privacy is off. 699 */ 700 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 701 wh, "WEP", "%s", "PRIVACY off"); 702 vap->iv_stats.is_rx_noprivacy++; 703 IEEE80211_NODE_STAT(ni, rx_noprivacy); 704 goto out; 705 } 706 key = ieee80211_crypto_decap(ni, m, hdrspace); 707 if (key == NULL) { 708 /* NB: stats+msgs handled in crypto_decap */ 709 IEEE80211_NODE_STAT(ni, rx_wepfail); 710 goto out; 711 } 712 wh = mtod(m, struct ieee80211_frame *); 713 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 714 } else { 715 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 716 key = NULL; 717 } 718 719 /* 720 * Save QoS bits for use below--before we strip the header. 721 */ 722 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 723 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 724 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 725 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 726 } else 727 qos = 0; 728 729 /* 730 * Next up, any fragmentation. 731 */ 732 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 733 m = ieee80211_defrag(ni, m, hdrspace); 734 if (m == NULL) { 735 /* Fragment dropped or frame not complete yet */ 736 goto out; 737 } 738 } 739 wh = NULL; /* no longer valid, catch any uses */ 740 741 /* 742 * Next strip any MSDU crypto bits. 743 */ 744 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 745 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 746 ni->ni_macaddr, "data", "%s", "demic error"); 747 vap->iv_stats.is_rx_demicfail++; 748 IEEE80211_NODE_STAT(ni, rx_demicfail); 749 goto out; 750 } 751 /* copy to listener after decrypt */ 752 if (ieee80211_radiotap_active_vap(vap)) 753 ieee80211_radiotap_rx(vap, m); 754 need_tap = 0; 755 /* 756 * Finally, strip the 802.11 header. 757 */ 758 m = ieee80211_decap(vap, m, hdrspace); 759 if (m == NULL) { 760 /* XXX mask bit to check for both */ 761 /* don't count Null data frames as errors */ 762 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 763 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 764 goto out; 765 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 766 ni->ni_macaddr, "data", "%s", "decap error"); 767 vap->iv_stats.is_rx_decap++; 768 IEEE80211_NODE_STAT(ni, rx_decap); 769 goto err; 770 } 771 eh = mtod(m, struct ether_header *); 772 if (!ieee80211_node_is_authorized(ni)) { 773 /* 774 * Deny any non-PAE frames received prior to 775 * authorization. For open/shared-key 776 * authentication the port is mark authorized 777 * after authentication completes. For 802.1x 778 * the port is not marked authorized by the 779 * authenticator until the handshake has completed. 780 */ 781 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 782 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 783 eh->ether_shost, "data", 784 "unauthorized port: ether type 0x%x len %u", 785 eh->ether_type, m->m_pkthdr.len); 786 vap->iv_stats.is_rx_unauth++; 787 IEEE80211_NODE_STAT(ni, rx_unauth); 788 goto err; 789 } 790 } else { 791 /* 792 * When denying unencrypted frames, discard 793 * any non-PAE frames received without encryption. 794 */ 795 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 796 (key == NULL && (m->m_flags & M_WEP) == 0) && 797 eh->ether_type != htons(ETHERTYPE_PAE)) { 798 /* 799 * Drop unencrypted frames. 800 */ 801 vap->iv_stats.is_rx_unencrypted++; 802 IEEE80211_NODE_STAT(ni, rx_unencrypted); 803 goto out; 804 } 805 } 806 /* XXX require HT? */ 807 if (qos & IEEE80211_QOS_AMSDU) { 808 m = ieee80211_decap_amsdu(ni, m); 809 if (m == NULL) 810 return IEEE80211_FC0_TYPE_DATA; 811 } else { 812 #ifdef IEEE80211_SUPPORT_SUPERG 813 m = ieee80211_decap_fastframe(vap, ni, m); 814 if (m == NULL) 815 return IEEE80211_FC0_TYPE_DATA; 816 #endif 817 } 818 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 819 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 820 else 821 hostap_deliver_data(vap, ni, m); 822 return IEEE80211_FC0_TYPE_DATA; 823 824 case IEEE80211_FC0_TYPE_MGT: 825 vap->iv_stats.is_rx_mgmt++; 826 IEEE80211_NODE_STAT(ni, rx_mgmt); 827 if (dir != IEEE80211_FC1_DIR_NODS) { 828 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 829 wh, "mgt", "incorrect dir 0x%x", dir); 830 vap->iv_stats.is_rx_wrongdir++; 831 goto err; 832 } 833 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 834 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 835 ni->ni_macaddr, "mgt", "too short: len %u", 836 m->m_pkthdr.len); 837 vap->iv_stats.is_rx_tooshort++; 838 goto out; 839 } 840 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 841 /* ensure return frames are unicast */ 842 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 843 wh, NULL, "source is multicast: %s", 844 ether_sprintf(wh->i_addr2)); 845 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 846 goto out; 847 } 848 #ifdef IEEE80211_DEBUG 849 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 850 ieee80211_msg_dumppkts(vap)) { 851 if_printf(ifp, "received %s from %s rssi %d\n", 852 ieee80211_mgt_subtype_name[subtype >> 853 IEEE80211_FC0_SUBTYPE_SHIFT], 854 ether_sprintf(wh->i_addr2), rssi); 855 } 856 #endif 857 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 858 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 859 /* 860 * Only shared key auth frames with a challenge 861 * should be encrypted, discard all others. 862 */ 863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 864 wh, NULL, 865 "%s", "WEP set but not permitted"); 866 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 867 goto out; 868 } 869 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 870 /* 871 * Discard encrypted frames when privacy is off. 872 */ 873 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 874 wh, NULL, "%s", "WEP set but PRIVACY off"); 875 vap->iv_stats.is_rx_noprivacy++; 876 goto out; 877 } 878 hdrspace = ieee80211_hdrspace(ic, wh); 879 key = ieee80211_crypto_decap(ni, m, hdrspace); 880 if (key == NULL) { 881 /* NB: stats+msgs handled in crypto_decap */ 882 goto out; 883 } 884 wh = mtod(m, struct ieee80211_frame *); 885 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 886 } 887 /* 888 * Pass the packet to radiotap before calling iv_recv_mgmt(). 889 * Otherwise iv_recv_mgmt() might pass another packet to 890 * radiotap, resulting in out of order packet captures. 891 */ 892 if (ieee80211_radiotap_active_vap(vap)) 893 ieee80211_radiotap_rx(vap, m); 894 need_tap = 0; 895 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 896 goto out; 897 898 case IEEE80211_FC0_TYPE_CTL: 899 vap->iv_stats.is_rx_ctl++; 900 IEEE80211_NODE_STAT(ni, rx_ctrl); 901 vap->iv_recv_ctl(ni, m, subtype); 902 goto out; 903 default: 904 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 905 wh, "bad", "frame type 0x%x", type); 906 /* should not come here */ 907 break; 908 } 909 err: 910 ifp->if_ierrors++; 911 out: 912 if (m != NULL) { 913 if (need_tap && ieee80211_radiotap_active_vap(vap)) 914 ieee80211_radiotap_rx(vap, m); 915 m_freem(m); 916 } 917 return type; 918 #undef SEQ_LEQ 919 } 920 921 static void 922 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 923 int rssi, int nf, uint16_t seq, uint16_t status) 924 { 925 struct ieee80211vap *vap = ni->ni_vap; 926 927 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 928 929 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 930 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 931 ni->ni_macaddr, "open auth", 932 "bad sta auth mode %u", ni->ni_authmode); 933 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 934 /* 935 * Clear any challenge text that may be there if 936 * a previous shared key auth failed and then an 937 * open auth is attempted. 938 */ 939 if (ni->ni_challenge != NULL) { 940 free(ni->ni_challenge, M_80211_NODE); 941 ni->ni_challenge = NULL; 942 } 943 /* XXX hack to workaround calling convention */ 944 ieee80211_send_error(ni, wh->i_addr2, 945 IEEE80211_FC0_SUBTYPE_AUTH, 946 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 947 return; 948 } 949 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 950 vap->iv_stats.is_rx_bad_auth++; 951 return; 952 } 953 /* always accept open authentication requests */ 954 if (ni == vap->iv_bss) { 955 ni = ieee80211_dup_bss(vap, wh->i_addr2); 956 if (ni == NULL) 957 return; 958 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 959 (void) ieee80211_ref_node(ni); 960 /* 961 * Mark the node as referenced to reflect that it's 962 * reference count has been bumped to insure it remains 963 * after the transaction completes. 964 */ 965 ni->ni_flags |= IEEE80211_NODE_AREF; 966 /* 967 * Mark the node as requiring a valid association id 968 * before outbound traffic is permitted. 969 */ 970 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 971 972 if (vap->iv_acl != NULL && 973 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 974 /* 975 * When the ACL policy is set to RADIUS we defer the 976 * authorization to a user agent. Dispatch an event, 977 * a subsequent MLME call will decide the fate of the 978 * station. If the user agent is not present then the 979 * node will be reclaimed due to inactivity. 980 */ 981 IEEE80211_NOTE_MAC(vap, 982 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 983 "%s", "station authentication defered (radius acl)"); 984 ieee80211_notify_node_auth(ni); 985 } else { 986 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 987 IEEE80211_NOTE_MAC(vap, 988 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 989 "%s", "station authenticated (open)"); 990 /* 991 * When 802.1x is not in use mark the port 992 * authorized at this point so traffic can flow. 993 */ 994 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 995 ieee80211_node_authorize(ni); 996 } 997 } 998 999 static void 1000 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1001 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1002 uint16_t seq, uint16_t status) 1003 { 1004 struct ieee80211vap *vap = ni->ni_vap; 1005 uint8_t *challenge; 1006 int allocbs, estatus; 1007 1008 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1009 1010 /* 1011 * NB: this can happen as we allow pre-shared key 1012 * authentication to be enabled w/o wep being turned 1013 * on so that configuration of these can be done 1014 * in any order. It may be better to enforce the 1015 * ordering in which case this check would just be 1016 * for sanity/consistency. 1017 */ 1018 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1019 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1020 ni->ni_macaddr, "shared key auth", 1021 "%s", " PRIVACY is disabled"); 1022 estatus = IEEE80211_STATUS_ALG; 1023 goto bad; 1024 } 1025 /* 1026 * Pre-shared key authentication is evil; accept 1027 * it only if explicitly configured (it is supported 1028 * mainly for compatibility with clients like Mac OS X). 1029 */ 1030 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1031 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1032 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1033 ni->ni_macaddr, "shared key auth", 1034 "bad sta auth mode %u", ni->ni_authmode); 1035 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1036 estatus = IEEE80211_STATUS_ALG; 1037 goto bad; 1038 } 1039 1040 challenge = NULL; 1041 if (frm + 1 < efrm) { 1042 if ((frm[1] + 2) > (efrm - frm)) { 1043 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1044 ni->ni_macaddr, "shared key auth", 1045 "ie %d/%d too long", 1046 frm[0], (frm[1] + 2) - (efrm - frm)); 1047 vap->iv_stats.is_rx_bad_auth++; 1048 estatus = IEEE80211_STATUS_CHALLENGE; 1049 goto bad; 1050 } 1051 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1052 challenge = frm; 1053 frm += frm[1] + 2; 1054 } 1055 switch (seq) { 1056 case IEEE80211_AUTH_SHARED_CHALLENGE: 1057 case IEEE80211_AUTH_SHARED_RESPONSE: 1058 if (challenge == NULL) { 1059 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1060 ni->ni_macaddr, "shared key auth", 1061 "%s", "no challenge"); 1062 vap->iv_stats.is_rx_bad_auth++; 1063 estatus = IEEE80211_STATUS_CHALLENGE; 1064 goto bad; 1065 } 1066 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1067 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1068 ni->ni_macaddr, "shared key auth", 1069 "bad challenge len %d", challenge[1]); 1070 vap->iv_stats.is_rx_bad_auth++; 1071 estatus = IEEE80211_STATUS_CHALLENGE; 1072 goto bad; 1073 } 1074 default: 1075 break; 1076 } 1077 switch (seq) { 1078 case IEEE80211_AUTH_SHARED_REQUEST: 1079 if (ni == vap->iv_bss) { 1080 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1081 if (ni == NULL) { 1082 /* NB: no way to return an error */ 1083 return; 1084 } 1085 allocbs = 1; 1086 } else { 1087 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1088 (void) ieee80211_ref_node(ni); 1089 allocbs = 0; 1090 } 1091 /* 1092 * Mark the node as referenced to reflect that it's 1093 * reference count has been bumped to insure it remains 1094 * after the transaction completes. 1095 */ 1096 ni->ni_flags |= IEEE80211_NODE_AREF; 1097 /* 1098 * Mark the node as requiring a valid associatio id 1099 * before outbound traffic is permitted. 1100 */ 1101 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1102 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1103 ni->ni_noise = nf; 1104 if (!ieee80211_alloc_challenge(ni)) { 1105 /* NB: don't return error so they rexmit */ 1106 return; 1107 } 1108 get_random_bytes(ni->ni_challenge, 1109 IEEE80211_CHALLENGE_LEN); 1110 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1111 ni, "shared key %sauth request", allocbs ? "" : "re"); 1112 /* 1113 * When the ACL policy is set to RADIUS we defer the 1114 * authorization to a user agent. Dispatch an event, 1115 * a subsequent MLME call will decide the fate of the 1116 * station. If the user agent is not present then the 1117 * node will be reclaimed due to inactivity. 1118 */ 1119 if (vap->iv_acl != NULL && 1120 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1121 IEEE80211_NOTE_MAC(vap, 1122 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1123 ni->ni_macaddr, 1124 "%s", "station authentication defered (radius acl)"); 1125 ieee80211_notify_node_auth(ni); 1126 return; 1127 } 1128 break; 1129 case IEEE80211_AUTH_SHARED_RESPONSE: 1130 if (ni == vap->iv_bss) { 1131 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1132 ni->ni_macaddr, "shared key response", 1133 "%s", "unknown station"); 1134 /* NB: don't send a response */ 1135 return; 1136 } 1137 if (ni->ni_challenge == NULL) { 1138 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1139 ni->ni_macaddr, "shared key response", 1140 "%s", "no challenge recorded"); 1141 vap->iv_stats.is_rx_bad_auth++; 1142 estatus = IEEE80211_STATUS_CHALLENGE; 1143 goto bad; 1144 } 1145 if (memcmp(ni->ni_challenge, &challenge[2], 1146 challenge[1]) != 0) { 1147 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1148 ni->ni_macaddr, "shared key response", 1149 "%s", "challenge mismatch"); 1150 vap->iv_stats.is_rx_auth_fail++; 1151 estatus = IEEE80211_STATUS_CHALLENGE; 1152 goto bad; 1153 } 1154 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1155 ni, "%s", "station authenticated (shared key)"); 1156 ieee80211_node_authorize(ni); 1157 break; 1158 default: 1159 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1160 ni->ni_macaddr, "shared key auth", 1161 "bad seq %d", seq); 1162 vap->iv_stats.is_rx_bad_auth++; 1163 estatus = IEEE80211_STATUS_SEQUENCE; 1164 goto bad; 1165 } 1166 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1167 return; 1168 bad: 1169 /* 1170 * Send an error response; but only when operating as an AP. 1171 */ 1172 /* XXX hack to workaround calling convention */ 1173 ieee80211_send_error(ni, wh->i_addr2, 1174 IEEE80211_FC0_SUBTYPE_AUTH, 1175 (seq + 1) | (estatus<<16)); 1176 } 1177 1178 /* 1179 * Convert a WPA cipher selector OUI to an internal 1180 * cipher algorithm. Where appropriate we also 1181 * record any key length. 1182 */ 1183 static int 1184 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1185 { 1186 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1187 uint32_t w = LE_READ_4(sel); 1188 1189 switch (w) { 1190 case WPA_SEL(WPA_CSE_NULL): 1191 return IEEE80211_CIPHER_NONE; 1192 case WPA_SEL(WPA_CSE_WEP40): 1193 if (keylen) 1194 *keylen = 40 / NBBY; 1195 return IEEE80211_CIPHER_WEP; 1196 case WPA_SEL(WPA_CSE_WEP104): 1197 if (keylen) 1198 *keylen = 104 / NBBY; 1199 return IEEE80211_CIPHER_WEP; 1200 case WPA_SEL(WPA_CSE_TKIP): 1201 return IEEE80211_CIPHER_TKIP; 1202 case WPA_SEL(WPA_CSE_CCMP): 1203 return IEEE80211_CIPHER_AES_CCM; 1204 } 1205 return 32; /* NB: so 1<< is discarded */ 1206 #undef WPA_SEL 1207 } 1208 1209 /* 1210 * Convert a WPA key management/authentication algorithm 1211 * to an internal code. 1212 */ 1213 static int 1214 wpa_keymgmt(const uint8_t *sel) 1215 { 1216 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1217 uint32_t w = LE_READ_4(sel); 1218 1219 switch (w) { 1220 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1221 return WPA_ASE_8021X_UNSPEC; 1222 case WPA_SEL(WPA_ASE_8021X_PSK): 1223 return WPA_ASE_8021X_PSK; 1224 case WPA_SEL(WPA_ASE_NONE): 1225 return WPA_ASE_NONE; 1226 } 1227 return 0; /* NB: so is discarded */ 1228 #undef WPA_SEL 1229 } 1230 1231 /* 1232 * Parse a WPA information element to collect parameters. 1233 * Note that we do not validate security parameters; that 1234 * is handled by the authenticator; the parsing done here 1235 * is just for internal use in making operational decisions. 1236 */ 1237 static int 1238 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1239 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1240 { 1241 uint8_t len = frm[1]; 1242 uint32_t w; 1243 int n; 1244 1245 /* 1246 * Check the length once for fixed parts: OUI, type, 1247 * version, mcast cipher, and 2 selector counts. 1248 * Other, variable-length data, must be checked separately. 1249 */ 1250 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1251 IEEE80211_DISCARD_IE(vap, 1252 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1253 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1254 return IEEE80211_REASON_IE_INVALID; 1255 } 1256 if (len < 14) { 1257 IEEE80211_DISCARD_IE(vap, 1258 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1259 wh, "WPA", "too short, len %u", len); 1260 return IEEE80211_REASON_IE_INVALID; 1261 } 1262 frm += 6, len -= 4; /* NB: len is payload only */ 1263 /* NB: iswapoui already validated the OUI and type */ 1264 w = LE_READ_2(frm); 1265 if (w != WPA_VERSION) { 1266 IEEE80211_DISCARD_IE(vap, 1267 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1268 wh, "WPA", "bad version %u", w); 1269 return IEEE80211_REASON_IE_INVALID; 1270 } 1271 frm += 2, len -= 2; 1272 1273 memset(rsn, 0, sizeof(*rsn)); 1274 1275 /* multicast/group cipher */ 1276 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1277 frm += 4, len -= 4; 1278 1279 /* unicast ciphers */ 1280 n = LE_READ_2(frm); 1281 frm += 2, len -= 2; 1282 if (len < n*4+2) { 1283 IEEE80211_DISCARD_IE(vap, 1284 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1285 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1286 len, n); 1287 return IEEE80211_REASON_IE_INVALID; 1288 } 1289 w = 0; 1290 for (; n > 0; n--) { 1291 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1292 frm += 4, len -= 4; 1293 } 1294 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1295 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1296 else 1297 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1298 1299 /* key management algorithms */ 1300 n = LE_READ_2(frm); 1301 frm += 2, len -= 2; 1302 if (len < n*4) { 1303 IEEE80211_DISCARD_IE(vap, 1304 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1305 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1306 len, n); 1307 return IEEE80211_REASON_IE_INVALID; 1308 } 1309 w = 0; 1310 for (; n > 0; n--) { 1311 w |= wpa_keymgmt(frm); 1312 frm += 4, len -= 4; 1313 } 1314 if (w & WPA_ASE_8021X_UNSPEC) 1315 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1316 else 1317 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1318 1319 if (len > 2) /* optional capabilities */ 1320 rsn->rsn_caps = LE_READ_2(frm); 1321 1322 return 0; 1323 } 1324 1325 /* 1326 * Convert an RSN cipher selector OUI to an internal 1327 * cipher algorithm. Where appropriate we also 1328 * record any key length. 1329 */ 1330 static int 1331 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1332 { 1333 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1334 uint32_t w = LE_READ_4(sel); 1335 1336 switch (w) { 1337 case RSN_SEL(RSN_CSE_NULL): 1338 return IEEE80211_CIPHER_NONE; 1339 case RSN_SEL(RSN_CSE_WEP40): 1340 if (keylen) 1341 *keylen = 40 / NBBY; 1342 return IEEE80211_CIPHER_WEP; 1343 case RSN_SEL(RSN_CSE_WEP104): 1344 if (keylen) 1345 *keylen = 104 / NBBY; 1346 return IEEE80211_CIPHER_WEP; 1347 case RSN_SEL(RSN_CSE_TKIP): 1348 return IEEE80211_CIPHER_TKIP; 1349 case RSN_SEL(RSN_CSE_CCMP): 1350 return IEEE80211_CIPHER_AES_CCM; 1351 case RSN_SEL(RSN_CSE_WRAP): 1352 return IEEE80211_CIPHER_AES_OCB; 1353 } 1354 return 32; /* NB: so 1<< is discarded */ 1355 #undef WPA_SEL 1356 } 1357 1358 /* 1359 * Convert an RSN key management/authentication algorithm 1360 * to an internal code. 1361 */ 1362 static int 1363 rsn_keymgmt(const uint8_t *sel) 1364 { 1365 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1366 uint32_t w = LE_READ_4(sel); 1367 1368 switch (w) { 1369 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1370 return RSN_ASE_8021X_UNSPEC; 1371 case RSN_SEL(RSN_ASE_8021X_PSK): 1372 return RSN_ASE_8021X_PSK; 1373 case RSN_SEL(RSN_ASE_NONE): 1374 return RSN_ASE_NONE; 1375 } 1376 return 0; /* NB: so is discarded */ 1377 #undef RSN_SEL 1378 } 1379 1380 /* 1381 * Parse a WPA/RSN information element to collect parameters 1382 * and validate the parameters against what has been 1383 * configured for the system. 1384 */ 1385 static int 1386 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1387 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1388 { 1389 uint8_t len = frm[1]; 1390 uint32_t w; 1391 int n; 1392 1393 /* 1394 * Check the length once for fixed parts: 1395 * version, mcast cipher, and 2 selector counts. 1396 * Other, variable-length data, must be checked separately. 1397 */ 1398 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1399 IEEE80211_DISCARD_IE(vap, 1400 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1401 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1402 return IEEE80211_REASON_IE_INVALID; 1403 } 1404 if (len < 10) { 1405 IEEE80211_DISCARD_IE(vap, 1406 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1407 wh, "RSN", "too short, len %u", len); 1408 return IEEE80211_REASON_IE_INVALID; 1409 } 1410 frm += 2; 1411 w = LE_READ_2(frm); 1412 if (w != RSN_VERSION) { 1413 IEEE80211_DISCARD_IE(vap, 1414 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1415 wh, "RSN", "bad version %u", w); 1416 return IEEE80211_REASON_IE_INVALID; 1417 } 1418 frm += 2, len -= 2; 1419 1420 memset(rsn, 0, sizeof(*rsn)); 1421 1422 /* multicast/group cipher */ 1423 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1424 frm += 4, len -= 4; 1425 1426 /* unicast ciphers */ 1427 n = LE_READ_2(frm); 1428 frm += 2, len -= 2; 1429 if (len < n*4+2) { 1430 IEEE80211_DISCARD_IE(vap, 1431 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1432 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1433 len, n); 1434 return IEEE80211_REASON_IE_INVALID; 1435 } 1436 w = 0; 1437 for (; n > 0; n--) { 1438 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1439 frm += 4, len -= 4; 1440 } 1441 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1442 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1443 else 1444 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1445 1446 /* key management algorithms */ 1447 n = LE_READ_2(frm); 1448 frm += 2, len -= 2; 1449 if (len < n*4) { 1450 IEEE80211_DISCARD_IE(vap, 1451 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1452 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1453 len, n); 1454 return IEEE80211_REASON_IE_INVALID; 1455 } 1456 w = 0; 1457 for (; n > 0; n--) { 1458 w |= rsn_keymgmt(frm); 1459 frm += 4, len -= 4; 1460 } 1461 if (w & RSN_ASE_8021X_UNSPEC) 1462 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1463 else 1464 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1465 1466 /* optional RSN capabilities */ 1467 if (len > 2) 1468 rsn->rsn_caps = LE_READ_2(frm); 1469 /* XXXPMKID */ 1470 1471 return 0; 1472 } 1473 1474 /* 1475 * WPA/802.11i assocation request processing. 1476 */ 1477 static int 1478 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1479 const struct ieee80211_frame *wh, const uint8_t *wpa, 1480 const uint8_t *rsn, uint16_t capinfo) 1481 { 1482 struct ieee80211vap *vap = ni->ni_vap; 1483 uint8_t reason; 1484 int badwparsn; 1485 1486 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1487 if (wpa == NULL && rsn == NULL) { 1488 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1489 /* 1490 * W-Fi Protected Setup (WPS) permits 1491 * clients to associate and pass EAPOL frames 1492 * to establish initial credentials. 1493 */ 1494 ni->ni_flags |= IEEE80211_NODE_WPS; 1495 return 1; 1496 } 1497 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1498 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1499 /* 1500 * Transitional Security Network. Permits clients 1501 * to associate and use WEP while WPA is configured. 1502 */ 1503 ni->ni_flags |= IEEE80211_NODE_TSN; 1504 return 1; 1505 } 1506 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1507 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1508 vap->iv_stats.is_rx_assoc_badwpaie++; 1509 reason = IEEE80211_REASON_IE_INVALID; 1510 goto bad; 1511 } 1512 /* assert right association security credentials */ 1513 badwparsn = 0; /* NB: to silence compiler */ 1514 switch (vap->iv_flags & IEEE80211_F_WPA) { 1515 case IEEE80211_F_WPA1: 1516 badwparsn = (wpa == NULL); 1517 break; 1518 case IEEE80211_F_WPA2: 1519 badwparsn = (rsn == NULL); 1520 break; 1521 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1522 badwparsn = (wpa == NULL && rsn == NULL); 1523 break; 1524 } 1525 if (badwparsn) { 1526 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1527 wh, NULL, 1528 "%s", "missing WPA/RSN IE in association request"); 1529 vap->iv_stats.is_rx_assoc_badwpaie++; 1530 reason = IEEE80211_REASON_IE_INVALID; 1531 goto bad; 1532 } 1533 /* 1534 * Parse WPA/RSN information element. 1535 */ 1536 if (wpa != NULL) 1537 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1538 else 1539 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1540 if (reason != 0) { 1541 /* XXX distinguish WPA/RSN? */ 1542 vap->iv_stats.is_rx_assoc_badwpaie++; 1543 goto bad; 1544 } 1545 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1546 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1547 wpa != NULL ? "WPA" : "RSN", 1548 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1549 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1550 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1551 1552 return 1; 1553 bad: 1554 ieee80211_node_deauth(ni, reason); 1555 return 0; 1556 } 1557 1558 /* XXX find a better place for definition */ 1559 struct l2_update_frame { 1560 struct ether_header eh; 1561 uint8_t dsap; 1562 uint8_t ssap; 1563 uint8_t control; 1564 uint8_t xid[3]; 1565 } __packed; 1566 1567 /* 1568 * Deliver a TGf L2UF frame on behalf of a station. 1569 * This primes any bridge when the station is roaming 1570 * between ap's on the same wired network. 1571 */ 1572 static void 1573 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1574 { 1575 struct ieee80211vap *vap = ni->ni_vap; 1576 struct ifnet *ifp = vap->iv_ifp; 1577 struct mbuf *m; 1578 struct l2_update_frame *l2uf; 1579 struct ether_header *eh; 1580 1581 m = m_gethdr(M_NOWAIT, MT_DATA); 1582 if (m == NULL) { 1583 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1584 "%s", "no mbuf for l2uf frame"); 1585 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1586 return; 1587 } 1588 l2uf = mtod(m, struct l2_update_frame *); 1589 eh = &l2uf->eh; 1590 /* dst: Broadcast address */ 1591 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1592 /* src: associated STA */ 1593 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1594 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1595 1596 l2uf->dsap = 0; 1597 l2uf->ssap = 0; 1598 l2uf->control = 0xf5; 1599 l2uf->xid[0] = 0x81; 1600 l2uf->xid[1] = 0x80; 1601 l2uf->xid[2] = 0x00; 1602 1603 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1604 hostap_deliver_data(vap, ni, m); 1605 } 1606 1607 static void 1608 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1609 int reassoc, int resp, const char *tag, int rate) 1610 { 1611 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1612 "deny %s request, %s rate set mismatch, rate/MCS %d", 1613 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1614 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1615 ieee80211_node_leave(ni); 1616 } 1617 1618 static void 1619 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1620 int reassoc, int resp, const char *tag, int capinfo) 1621 { 1622 struct ieee80211vap *vap = ni->ni_vap; 1623 1624 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1625 "deny %s request, %s mismatch 0x%x", 1626 reassoc ? "reassoc" : "assoc", tag, capinfo); 1627 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1628 ieee80211_node_leave(ni); 1629 vap->iv_stats.is_rx_assoc_capmismatch++; 1630 } 1631 1632 static void 1633 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1634 int reassoc, int resp) 1635 { 1636 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1637 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1638 /* XXX no better code */ 1639 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1640 ieee80211_node_leave(ni); 1641 } 1642 1643 static void 1644 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1645 int algo, int seq, int status) 1646 { 1647 struct ieee80211vap *vap = ni->ni_vap; 1648 1649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1650 wh, NULL, "unsupported alg %d", algo); 1651 vap->iv_stats.is_rx_auth_unsupported++; 1652 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1653 seq | (status << 16)); 1654 } 1655 1656 static __inline int 1657 ishtmixed(const uint8_t *ie) 1658 { 1659 const struct ieee80211_ie_htinfo *ht = 1660 (const struct ieee80211_ie_htinfo *) ie; 1661 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1662 IEEE80211_HTINFO_OPMODE_MIXED; 1663 } 1664 1665 static int 1666 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1667 { 1668 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1669 int i; 1670 1671 /* NB: the 11b clients we care about will not have xrates */ 1672 if (xrates != NULL || rates == NULL) 1673 return 0; 1674 for (i = 0; i < rates[1]; i++) { 1675 int r = rates[2+i] & IEEE80211_RATE_VAL; 1676 if (r > 2*11 || ((1<<r) & brates) == 0) 1677 return 0; 1678 } 1679 return 1; 1680 } 1681 1682 static void 1683 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1684 int subtype, int rssi, int nf) 1685 { 1686 struct ieee80211vap *vap = ni->ni_vap; 1687 struct ieee80211com *ic = ni->ni_ic; 1688 struct ieee80211_frame *wh; 1689 uint8_t *frm, *efrm, *sfrm; 1690 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1691 int reassoc, resp; 1692 uint8_t rate; 1693 1694 wh = mtod(m0, struct ieee80211_frame *); 1695 frm = (uint8_t *)&wh[1]; 1696 efrm = mtod(m0, uint8_t *) + m0->m_len; 1697 switch (subtype) { 1698 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1699 case IEEE80211_FC0_SUBTYPE_BEACON: { 1700 struct ieee80211_scanparams scan; 1701 /* 1702 * We process beacon/probe response frames when scanning; 1703 * otherwise we check beacon frames for overlapping non-ERP 1704 * BSS in 11g and/or overlapping legacy BSS when in HT. 1705 */ 1706 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1707 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1708 vap->iv_stats.is_rx_mgtdiscard++; 1709 return; 1710 } 1711 /* NB: accept off-channel frames */ 1712 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1713 return; 1714 /* 1715 * Count frame now that we know it's to be processed. 1716 */ 1717 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1718 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1719 IEEE80211_NODE_STAT(ni, rx_beacons); 1720 } else 1721 IEEE80211_NODE_STAT(ni, rx_proberesp); 1722 /* 1723 * If scanning, just pass information to the scan module. 1724 */ 1725 if (ic->ic_flags & IEEE80211_F_SCAN) { 1726 if (scan.status == 0 && /* NB: on channel */ 1727 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1728 /* 1729 * Actively scanning a channel marked passive; 1730 * send a probe request now that we know there 1731 * is 802.11 traffic present. 1732 * 1733 * XXX check if the beacon we recv'd gives 1734 * us what we need and suppress the probe req 1735 */ 1736 ieee80211_probe_curchan(vap, 1); 1737 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1738 } 1739 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1740 return; 1741 } 1742 /* 1743 * Check beacon for overlapping bss w/ non ERP stations. 1744 * If we detect one and protection is configured but not 1745 * enabled, enable it and start a timer that'll bring us 1746 * out if we stop seeing the bss. 1747 */ 1748 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1749 scan.status == 0 && /* NB: on-channel */ 1750 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1751 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1752 ic->ic_lastnonerp = ticks; 1753 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1754 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1755 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1756 IEEE80211_NOTE_FRAME(vap, 1757 IEEE80211_MSG_ASSOC, wh, 1758 "non-ERP present on channel %d " 1759 "(saw erp 0x%x from channel %d), " 1760 "enable use of protection", 1761 ic->ic_curchan->ic_ieee, 1762 scan.erp, scan.chan); 1763 ic->ic_flags |= IEEE80211_F_USEPROT; 1764 ieee80211_notify_erp(ic); 1765 } 1766 } 1767 /* 1768 * Check beacon for non-HT station on HT channel 1769 * and update HT BSS occupancy as appropriate. 1770 */ 1771 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1772 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1773 /* 1774 * Off control channel; only check frames 1775 * that come in the extension channel when 1776 * operating w/ HT40. 1777 */ 1778 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1779 break; 1780 if (scan.chan != ic->ic_curchan->ic_extieee) 1781 break; 1782 } 1783 if (scan.htinfo == NULL) { 1784 ieee80211_htprot_update(ic, 1785 IEEE80211_HTINFO_OPMODE_PROTOPT | 1786 IEEE80211_HTINFO_NONHT_PRESENT); 1787 } else if (ishtmixed(scan.htinfo)) { 1788 /* XXX? take NONHT_PRESENT from beacon? */ 1789 ieee80211_htprot_update(ic, 1790 IEEE80211_HTINFO_OPMODE_MIXED | 1791 IEEE80211_HTINFO_NONHT_PRESENT); 1792 } 1793 } 1794 break; 1795 } 1796 1797 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1798 if (vap->iv_state != IEEE80211_S_RUN) { 1799 vap->iv_stats.is_rx_mgtdiscard++; 1800 return; 1801 } 1802 /* 1803 * prreq frame format 1804 * [tlv] ssid 1805 * [tlv] supported rates 1806 * [tlv] extended supported rates 1807 */ 1808 ssid = rates = xrates = NULL; 1809 sfrm = frm; 1810 while (efrm - frm > 1) { 1811 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1812 switch (*frm) { 1813 case IEEE80211_ELEMID_SSID: 1814 ssid = frm; 1815 break; 1816 case IEEE80211_ELEMID_RATES: 1817 rates = frm; 1818 break; 1819 case IEEE80211_ELEMID_XRATES: 1820 xrates = frm; 1821 break; 1822 } 1823 frm += frm[1] + 2; 1824 } 1825 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1826 if (xrates != NULL) 1827 IEEE80211_VERIFY_ELEMENT(xrates, 1828 IEEE80211_RATE_MAXSIZE - rates[1], return); 1829 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1830 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1831 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1832 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1833 wh, NULL, 1834 "%s", "no ssid with ssid suppression enabled"); 1835 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1836 return; 1837 } 1838 1839 /* XXX find a better class or define it's own */ 1840 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1841 "%s", "recv probe req"); 1842 /* 1843 * Some legacy 11b clients cannot hack a complete 1844 * probe response frame. When the request includes 1845 * only a bare-bones rate set, communicate this to 1846 * the transmit side. 1847 */ 1848 ieee80211_send_proberesp(vap, wh->i_addr2, 1849 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1850 break; 1851 1852 case IEEE80211_FC0_SUBTYPE_AUTH: { 1853 uint16_t algo, seq, status; 1854 1855 if (vap->iv_state != IEEE80211_S_RUN) { 1856 vap->iv_stats.is_rx_mgtdiscard++; 1857 return; 1858 } 1859 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1860 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1861 wh, NULL, "%s", "wrong bssid"); 1862 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1863 return; 1864 } 1865 /* 1866 * auth frame format 1867 * [2] algorithm 1868 * [2] sequence 1869 * [2] status 1870 * [tlv*] challenge 1871 */ 1872 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1873 algo = le16toh(*(uint16_t *)frm); 1874 seq = le16toh(*(uint16_t *)(frm + 2)); 1875 status = le16toh(*(uint16_t *)(frm + 4)); 1876 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1877 "recv auth frame with algorithm %d seq %d", algo, seq); 1878 /* 1879 * Consult the ACL policy module if setup. 1880 */ 1881 if (vap->iv_acl != NULL && 1882 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1883 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1884 wh, NULL, "%s", "disallowed by ACL"); 1885 vap->iv_stats.is_rx_acl++; 1886 ieee80211_send_error(ni, wh->i_addr2, 1887 IEEE80211_FC0_SUBTYPE_AUTH, 1888 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1889 return; 1890 } 1891 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1892 IEEE80211_DISCARD(vap, 1893 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1894 wh, NULL, "%s", "TKIP countermeasures enabled"); 1895 vap->iv_stats.is_rx_auth_countermeasures++; 1896 ieee80211_send_error(ni, wh->i_addr2, 1897 IEEE80211_FC0_SUBTYPE_AUTH, 1898 IEEE80211_REASON_MIC_FAILURE); 1899 return; 1900 } 1901 if (algo == IEEE80211_AUTH_ALG_SHARED) 1902 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1903 seq, status); 1904 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1905 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1906 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1907 authalgreject(ni, wh, algo, 1908 seq+1, IEEE80211_STATUS_ALG); 1909 return; 1910 } else { 1911 /* 1912 * We assume that an unknown algorithm is the result 1913 * of a decryption failure on a shared key auth frame; 1914 * return a status code appropriate for that instead 1915 * of IEEE80211_STATUS_ALG. 1916 * 1917 * NB: a seq# of 4 is intentional; the decrypted 1918 * frame likely has a bogus seq value. 1919 */ 1920 authalgreject(ni, wh, algo, 1921 4, IEEE80211_STATUS_CHALLENGE); 1922 return; 1923 } 1924 break; 1925 } 1926 1927 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1928 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1929 uint16_t capinfo, lintval; 1930 struct ieee80211_rsnparms rsnparms; 1931 1932 if (vap->iv_state != IEEE80211_S_RUN) { 1933 vap->iv_stats.is_rx_mgtdiscard++; 1934 return; 1935 } 1936 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1937 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1938 wh, NULL, "%s", "wrong bssid"); 1939 vap->iv_stats.is_rx_assoc_bss++; 1940 return; 1941 } 1942 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1943 reassoc = 1; 1944 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1945 } else { 1946 reassoc = 0; 1947 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1948 } 1949 if (ni == vap->iv_bss) { 1950 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1951 "deny %s request, sta not authenticated", 1952 reassoc ? "reassoc" : "assoc"); 1953 ieee80211_send_error(ni, wh->i_addr2, 1954 IEEE80211_FC0_SUBTYPE_DEAUTH, 1955 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1956 vap->iv_stats.is_rx_assoc_notauth++; 1957 return; 1958 } 1959 1960 /* 1961 * asreq frame format 1962 * [2] capability information 1963 * [2] listen interval 1964 * [6*] current AP address (reassoc only) 1965 * [tlv] ssid 1966 * [tlv] supported rates 1967 * [tlv] extended supported rates 1968 * [tlv] WPA or RSN 1969 * [tlv] HT capabilities 1970 * [tlv] Atheros capabilities 1971 */ 1972 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1973 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1974 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1975 if (reassoc) 1976 frm += 6; /* ignore current AP info */ 1977 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1978 sfrm = frm; 1979 while (efrm - frm > 1) { 1980 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1981 switch (*frm) { 1982 case IEEE80211_ELEMID_SSID: 1983 ssid = frm; 1984 break; 1985 case IEEE80211_ELEMID_RATES: 1986 rates = frm; 1987 break; 1988 case IEEE80211_ELEMID_XRATES: 1989 xrates = frm; 1990 break; 1991 case IEEE80211_ELEMID_RSN: 1992 rsn = frm; 1993 break; 1994 case IEEE80211_ELEMID_HTCAP: 1995 htcap = frm; 1996 break; 1997 case IEEE80211_ELEMID_VENDOR: 1998 if (iswpaoui(frm)) 1999 wpa = frm; 2000 else if (iswmeinfo(frm)) 2001 wme = frm; 2002 #ifdef IEEE80211_SUPPORT_SUPERG 2003 else if (isatherosoui(frm)) 2004 ath = frm; 2005 #endif 2006 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2007 if (ishtcapoui(frm) && htcap == NULL) 2008 htcap = frm; 2009 } 2010 break; 2011 } 2012 frm += frm[1] + 2; 2013 } 2014 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2015 if (xrates != NULL) 2016 IEEE80211_VERIFY_ELEMENT(xrates, 2017 IEEE80211_RATE_MAXSIZE - rates[1], return); 2018 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2019 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2020 if (htcap != NULL) { 2021 IEEE80211_VERIFY_LENGTH(htcap[1], 2022 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2023 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2024 sizeof(struct ieee80211_ie_htcap)-2, 2025 return); /* XXX just NULL out? */ 2026 } 2027 2028 if ((vap->iv_flags & IEEE80211_F_WPA) && 2029 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2030 return; 2031 /* discard challenge after association */ 2032 if (ni->ni_challenge != NULL) { 2033 free(ni->ni_challenge, M_80211_NODE); 2034 ni->ni_challenge = NULL; 2035 } 2036 /* NB: 802.11 spec says to ignore station's privacy bit */ 2037 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2038 capinfomismatch(ni, wh, reassoc, resp, 2039 "capability", capinfo); 2040 return; 2041 } 2042 /* 2043 * Disallow re-associate w/ invalid slot time setting. 2044 */ 2045 if (ni->ni_associd != 0 && 2046 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2047 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2048 capinfomismatch(ni, wh, reassoc, resp, 2049 "slot time", capinfo); 2050 return; 2051 } 2052 rate = ieee80211_setup_rates(ni, rates, xrates, 2053 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2054 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2055 if (rate & IEEE80211_RATE_BASIC) { 2056 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2057 vap->iv_stats.is_rx_assoc_norate++; 2058 return; 2059 } 2060 /* 2061 * If constrained to 11g-only stations reject an 2062 * 11b-only station. We cheat a bit here by looking 2063 * at the max negotiated xmit rate and assuming anyone 2064 * with a best rate <24Mb/s is an 11b station. 2065 */ 2066 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2067 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2068 vap->iv_stats.is_rx_assoc_norate++; 2069 return; 2070 } 2071 /* 2072 * Do HT rate set handling and setup HT node state. 2073 */ 2074 ni->ni_chan = vap->iv_bss->ni_chan; 2075 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2076 rate = ieee80211_setup_htrates(ni, htcap, 2077 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2078 IEEE80211_F_DOBRS); 2079 if (rate & IEEE80211_RATE_BASIC) { 2080 ratesetmismatch(ni, wh, reassoc, resp, 2081 "HT", rate); 2082 vap->iv_stats.is_ht_assoc_norate++; 2083 return; 2084 } 2085 ieee80211_ht_node_init(ni); 2086 ieee80211_ht_updatehtcap(ni, htcap); 2087 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2088 ieee80211_ht_node_cleanup(ni); 2089 #ifdef IEEE80211_SUPPORT_SUPERG 2090 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2091 ieee80211_ff_node_cleanup(ni); 2092 #endif 2093 /* 2094 * Allow AMPDU operation only with unencrypted traffic 2095 * or AES-CCM; the 11n spec only specifies these ciphers 2096 * so permitting any others is undefined and can lead 2097 * to interoperability problems. 2098 */ 2099 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2100 (((vap->iv_flags & IEEE80211_F_WPA) && 2101 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2102 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2103 IEEE80211_NOTE(vap, 2104 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2105 "disallow HT use because WEP or TKIP requested, " 2106 "capinfo 0x%x ucastcipher %d", capinfo, 2107 rsnparms.rsn_ucastcipher); 2108 ieee80211_ht_node_cleanup(ni); 2109 vap->iv_stats.is_ht_assoc_downgrade++; 2110 } 2111 /* 2112 * If constrained to 11n-only stations reject legacy stations. 2113 */ 2114 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2115 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2116 htcapmismatch(ni, wh, reassoc, resp); 2117 vap->iv_stats.is_ht_assoc_nohtcap++; 2118 return; 2119 } 2120 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2121 ni->ni_noise = nf; 2122 ni->ni_intval = lintval; 2123 ni->ni_capinfo = capinfo; 2124 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2125 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2126 /* 2127 * Store the IEs. 2128 * XXX maybe better to just expand 2129 */ 2130 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2131 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2132 if (wpa != NULL) 2133 setie(wpa_ie, wpa - sfrm); 2134 if (rsn != NULL) 2135 setie(rsn_ie, rsn - sfrm); 2136 if (htcap != NULL) 2137 setie(htcap_ie, htcap - sfrm); 2138 if (wme != NULL) { 2139 setie(wme_ie, wme - sfrm); 2140 /* 2141 * Mark node as capable of QoS. 2142 */ 2143 ni->ni_flags |= IEEE80211_NODE_QOS; 2144 } else 2145 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2146 #ifdef IEEE80211_SUPPORT_SUPERG 2147 if (ath != NULL) { 2148 setie(ath_ie, ath - sfrm); 2149 /* 2150 * Parse ATH station parameters. 2151 */ 2152 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2153 } else 2154 #endif 2155 ni->ni_ath_flags = 0; 2156 #undef setie 2157 } else { 2158 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2159 ni->ni_ath_flags = 0; 2160 } 2161 ieee80211_node_join(ni, resp); 2162 ieee80211_deliver_l2uf(ni); 2163 break; 2164 } 2165 2166 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2167 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2168 uint16_t reason; 2169 2170 if (vap->iv_state != IEEE80211_S_RUN || 2171 /* NB: can happen when in promiscuous mode */ 2172 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2173 vap->iv_stats.is_rx_mgtdiscard++; 2174 break; 2175 } 2176 /* 2177 * deauth/disassoc frame format 2178 * [2] reason 2179 */ 2180 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2181 reason = le16toh(*(uint16_t *)frm); 2182 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2183 vap->iv_stats.is_rx_deauth++; 2184 IEEE80211_NODE_STAT(ni, rx_deauth); 2185 } else { 2186 vap->iv_stats.is_rx_disassoc++; 2187 IEEE80211_NODE_STAT(ni, rx_disassoc); 2188 } 2189 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2190 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2191 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2192 if (ni != vap->iv_bss) 2193 ieee80211_node_leave(ni); 2194 break; 2195 } 2196 2197 case IEEE80211_FC0_SUBTYPE_ACTION: 2198 if (vap->iv_state == IEEE80211_S_RUN) { 2199 if (ieee80211_parse_action(ni, m0) == 0) 2200 ic->ic_recv_action(ni, wh, frm, efrm); 2201 } else 2202 vap->iv_stats.is_rx_mgtdiscard++; 2203 break; 2204 2205 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2206 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2207 default: 2208 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2209 wh, "mgt", "subtype 0x%x not handled", subtype); 2210 vap->iv_stats.is_rx_badsubtype++; 2211 break; 2212 } 2213 } 2214 2215 static void 2216 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2217 { 2218 switch (subtype) { 2219 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2220 hostap_recv_pspoll(ni, m); 2221 break; 2222 case IEEE80211_FC0_SUBTYPE_BAR: 2223 ieee80211_recv_bar(ni, m); 2224 break; 2225 } 2226 } 2227 2228 /* 2229 * Process a received ps-poll frame. 2230 */ 2231 static void 2232 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2233 { 2234 struct ieee80211vap *vap = ni->ni_vap; 2235 struct ieee80211_frame_min *wh; 2236 struct ifnet *ifp; 2237 struct mbuf *m; 2238 uint16_t aid; 2239 int qlen; 2240 2241 wh = mtod(m0, struct ieee80211_frame_min *); 2242 if (ni->ni_associd == 0) { 2243 IEEE80211_DISCARD(vap, 2244 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2245 (struct ieee80211_frame *) wh, NULL, 2246 "%s", "unassociated station"); 2247 vap->iv_stats.is_ps_unassoc++; 2248 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2249 IEEE80211_REASON_NOT_ASSOCED); 2250 return; 2251 } 2252 2253 aid = le16toh(*(uint16_t *)wh->i_dur); 2254 if (aid != ni->ni_associd) { 2255 IEEE80211_DISCARD(vap, 2256 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2257 (struct ieee80211_frame *) wh, NULL, 2258 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2259 ni->ni_associd, aid); 2260 vap->iv_stats.is_ps_badaid++; 2261 /* 2262 * NB: We used to deauth the station but it turns out 2263 * the Blackberry Curve 8230 (and perhaps other devices) 2264 * sometimes send the wrong AID when WME is negotiated. 2265 * Being more lenient here seems ok as we already check 2266 * the station is associated and we only return frames 2267 * queued for the station (i.e. we don't use the AID). 2268 */ 2269 return; 2270 } 2271 2272 /* Okay, take the first queued packet and put it out... */ 2273 m = ieee80211_node_psq_dequeue(ni, &qlen); 2274 if (m == NULL) { 2275 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2276 "%s", "recv ps-poll, but queue empty"); 2277 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2278 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2279 if (vap->iv_set_tim != NULL) 2280 vap->iv_set_tim(ni, 0); /* just in case */ 2281 return; 2282 } 2283 /* 2284 * If there are more packets, set the more packets bit 2285 * in the packet dispatched to the station; otherwise 2286 * turn off the TIM bit. 2287 */ 2288 if (qlen != 0) { 2289 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2290 "recv ps-poll, send packet, %u still queued", qlen); 2291 m->m_flags |= M_MORE_DATA; 2292 } else { 2293 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2294 "%s", "recv ps-poll, send packet, queue empty"); 2295 if (vap->iv_set_tim != NULL) 2296 vap->iv_set_tim(ni, 0); 2297 } 2298 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2299 2300 if (m->m_flags & M_ENCAP) 2301 ifp = vap->iv_ic->ic_ifp; 2302 else 2303 ifp = vap->iv_ifp; 2304 IF_ENQUEUE(&ifp->if_snd, m); 2305 if_start(ifp); 2306 }
Cache object: d9490ac3c7f4f0a56ced9f50d9c156b6
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