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 HAS_SEQ(type) ((type & 0x4) == 0) 476 struct ieee80211vap *vap = ni->ni_vap; 477 struct ieee80211com *ic = ni->ni_ic; 478 struct ifnet *ifp = vap->iv_ifp; 479 struct ieee80211_frame *wh; 480 struct ieee80211_key *key; 481 struct ether_header *eh; 482 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 483 uint8_t dir, type, subtype, qos; 484 uint8_t *bssid; 485 uint16_t rxseq; 486 487 if (m->m_flags & M_AMPDU_MPDU) { 488 /* 489 * Fastpath for A-MPDU reorder q resubmission. Frames 490 * w/ M_AMPDU_MPDU marked have already passed through 491 * here but were received out of order and been held on 492 * the reorder queue. When resubmitted they are marked 493 * with the M_AMPDU_MPDU flag and we can bypass most of 494 * the normal processing. 495 */ 496 wh = mtod(m, struct ieee80211_frame *); 497 type = IEEE80211_FC0_TYPE_DATA; 498 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 499 subtype = IEEE80211_FC0_SUBTYPE_QOS; 500 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 501 goto resubmit_ampdu; 502 } 503 504 KASSERT(ni != NULL, ("null node")); 505 ni->ni_inact = ni->ni_inact_reload; 506 507 type = -1; /* undefined */ 508 509 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 510 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 511 ni->ni_macaddr, NULL, 512 "too short (1): len %u", m->m_pkthdr.len); 513 vap->iv_stats.is_rx_tooshort++; 514 goto out; 515 } 516 /* 517 * Bit of a cheat here, we use a pointer for a 3-address 518 * frame format but don't reference fields past outside 519 * ieee80211_frame_min w/o first validating the data is 520 * present. 521 */ 522 wh = mtod(m, struct ieee80211_frame *); 523 524 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 525 IEEE80211_FC0_VERSION_0) { 526 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 527 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 528 wh->i_fc[0], wh->i_fc[1]); 529 vap->iv_stats.is_rx_badversion++; 530 goto err; 531 } 532 533 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 534 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 535 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 536 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 537 if (dir != IEEE80211_FC1_DIR_NODS) 538 bssid = wh->i_addr1; 539 else if (type == IEEE80211_FC0_TYPE_CTL) 540 bssid = wh->i_addr1; 541 else { 542 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 543 IEEE80211_DISCARD_MAC(vap, 544 IEEE80211_MSG_ANY, ni->ni_macaddr, 545 NULL, "too short (2): len %u", 546 m->m_pkthdr.len); 547 vap->iv_stats.is_rx_tooshort++; 548 goto out; 549 } 550 bssid = wh->i_addr3; 551 } 552 /* 553 * Validate the bssid. 554 */ 555 if (!(type == IEEE80211_FC0_TYPE_MGT && 556 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 557 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 558 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 559 /* not interested in */ 560 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 561 bssid, NULL, "%s", "not to bss"); 562 vap->iv_stats.is_rx_wrongbss++; 563 goto out; 564 } 565 566 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 567 ni->ni_noise = nf; 568 if (HAS_SEQ(type)) { 569 uint8_t tid = ieee80211_gettid(wh); 570 if (IEEE80211_QOS_HAS_SEQ(wh) && 571 TID_TO_WME_AC(tid) >= WME_AC_VI) 572 ic->ic_wme.wme_hipri_traffic++; 573 rxseq = le16toh(*(uint16_t *)wh->i_seq); 574 if (! ieee80211_check_rxseq(ni, wh)) { 575 /* duplicate, discard */ 576 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 577 bssid, "duplicate", 578 "seqno <%u,%u> fragno <%u,%u> tid %u", 579 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 580 ni->ni_rxseqs[tid] >> 581 IEEE80211_SEQ_SEQ_SHIFT, 582 rxseq & IEEE80211_SEQ_FRAG_MASK, 583 ni->ni_rxseqs[tid] & 584 IEEE80211_SEQ_FRAG_MASK, 585 tid); 586 vap->iv_stats.is_rx_dup++; 587 IEEE80211_NODE_STAT(ni, rx_dup); 588 goto out; 589 } 590 ni->ni_rxseqs[tid] = rxseq; 591 } 592 } 593 594 switch (type) { 595 case IEEE80211_FC0_TYPE_DATA: 596 hdrspace = ieee80211_hdrspace(ic, wh); 597 if (m->m_len < hdrspace && 598 (m = m_pullup(m, hdrspace)) == NULL) { 599 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 600 ni->ni_macaddr, NULL, 601 "data too short: expecting %u", hdrspace); 602 vap->iv_stats.is_rx_tooshort++; 603 goto out; /* XXX */ 604 } 605 if (!(dir == IEEE80211_FC1_DIR_TODS || 606 (dir == IEEE80211_FC1_DIR_DSTODS && 607 (vap->iv_flags & IEEE80211_F_DWDS)))) { 608 if (dir != IEEE80211_FC1_DIR_DSTODS) { 609 IEEE80211_DISCARD(vap, 610 IEEE80211_MSG_INPUT, wh, "data", 611 "incorrect dir 0x%x", dir); 612 } else { 613 IEEE80211_DISCARD(vap, 614 IEEE80211_MSG_INPUT | 615 IEEE80211_MSG_WDS, wh, 616 "4-address data", 617 "%s", "DWDS not enabled"); 618 } 619 vap->iv_stats.is_rx_wrongdir++; 620 goto out; 621 } 622 /* check if source STA is associated */ 623 if (ni == vap->iv_bss) { 624 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 625 wh, "data", "%s", "unknown src"); 626 ieee80211_send_error(ni, wh->i_addr2, 627 IEEE80211_FC0_SUBTYPE_DEAUTH, 628 IEEE80211_REASON_NOT_AUTHED); 629 vap->iv_stats.is_rx_notassoc++; 630 goto err; 631 } 632 if (ni->ni_associd == 0) { 633 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 634 wh, "data", "%s", "unassoc src"); 635 IEEE80211_SEND_MGMT(ni, 636 IEEE80211_FC0_SUBTYPE_DISASSOC, 637 IEEE80211_REASON_NOT_ASSOCED); 638 vap->iv_stats.is_rx_notassoc++; 639 goto err; 640 } 641 642 /* 643 * Check for power save state change. 644 * XXX out-of-order A-MPDU frames? 645 */ 646 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 647 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 648 ieee80211_node_pwrsave(ni, 649 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 650 /* 651 * For 4-address packets handle WDS discovery 652 * notifications. Once a WDS link is setup frames 653 * are just delivered to the WDS vap (see below). 654 */ 655 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 656 if (!ieee80211_node_is_authorized(ni)) { 657 IEEE80211_DISCARD(vap, 658 IEEE80211_MSG_INPUT | 659 IEEE80211_MSG_WDS, wh, 660 "4-address data", 661 "%s", "unauthorized port"); 662 vap->iv_stats.is_rx_unauth++; 663 IEEE80211_NODE_STAT(ni, rx_unauth); 664 goto err; 665 } 666 ieee80211_dwds_discover(ni, m); 667 return type; 668 } 669 670 /* 671 * Handle A-MPDU re-ordering. If the frame is to be 672 * processed directly then ieee80211_ampdu_reorder 673 * will return 0; otherwise it has consumed the mbuf 674 * and we should do nothing more with it. 675 */ 676 if ((m->m_flags & M_AMPDU) && 677 ieee80211_ampdu_reorder(ni, m) != 0) { 678 m = NULL; 679 goto out; 680 } 681 resubmit_ampdu: 682 683 /* 684 * Handle privacy requirements. Note that we 685 * must not be preempted from here until after 686 * we (potentially) call ieee80211_crypto_demic; 687 * otherwise we may violate assumptions in the 688 * crypto cipher modules used to do delayed update 689 * of replay sequence numbers. 690 */ 691 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 692 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 693 /* 694 * Discard encrypted frames when privacy is off. 695 */ 696 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 697 wh, "WEP", "%s", "PRIVACY off"); 698 vap->iv_stats.is_rx_noprivacy++; 699 IEEE80211_NODE_STAT(ni, rx_noprivacy); 700 goto out; 701 } 702 key = ieee80211_crypto_decap(ni, m, hdrspace); 703 if (key == NULL) { 704 /* NB: stats+msgs handled in crypto_decap */ 705 IEEE80211_NODE_STAT(ni, rx_wepfail); 706 goto out; 707 } 708 wh = mtod(m, struct ieee80211_frame *); 709 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 710 } else { 711 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 712 key = NULL; 713 } 714 715 /* 716 * Save QoS bits for use below--before we strip the header. 717 */ 718 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 719 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 720 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 721 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 722 } else 723 qos = 0; 724 725 /* 726 * Next up, any fragmentation. 727 */ 728 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 729 m = ieee80211_defrag(ni, m, hdrspace); 730 if (m == NULL) { 731 /* Fragment dropped or frame not complete yet */ 732 goto out; 733 } 734 } 735 wh = NULL; /* no longer valid, catch any uses */ 736 737 /* 738 * Next strip any MSDU crypto bits. 739 */ 740 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 741 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 742 ni->ni_macaddr, "data", "%s", "demic error"); 743 vap->iv_stats.is_rx_demicfail++; 744 IEEE80211_NODE_STAT(ni, rx_demicfail); 745 goto out; 746 } 747 /* copy to listener after decrypt */ 748 if (ieee80211_radiotap_active_vap(vap)) 749 ieee80211_radiotap_rx(vap, m); 750 need_tap = 0; 751 /* 752 * Finally, strip the 802.11 header. 753 */ 754 m = ieee80211_decap(vap, m, hdrspace); 755 if (m == NULL) { 756 /* XXX mask bit to check for both */ 757 /* don't count Null data frames as errors */ 758 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 759 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 760 goto out; 761 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 762 ni->ni_macaddr, "data", "%s", "decap error"); 763 vap->iv_stats.is_rx_decap++; 764 IEEE80211_NODE_STAT(ni, rx_decap); 765 goto err; 766 } 767 eh = mtod(m, struct ether_header *); 768 if (!ieee80211_node_is_authorized(ni)) { 769 /* 770 * Deny any non-PAE frames received prior to 771 * authorization. For open/shared-key 772 * authentication the port is mark authorized 773 * after authentication completes. For 802.1x 774 * the port is not marked authorized by the 775 * authenticator until the handshake has completed. 776 */ 777 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 778 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 779 eh->ether_shost, "data", 780 "unauthorized port: ether type 0x%x len %u", 781 eh->ether_type, m->m_pkthdr.len); 782 vap->iv_stats.is_rx_unauth++; 783 IEEE80211_NODE_STAT(ni, rx_unauth); 784 goto err; 785 } 786 } else { 787 /* 788 * When denying unencrypted frames, discard 789 * any non-PAE frames received without encryption. 790 */ 791 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 792 (key == NULL && (m->m_flags & M_WEP) == 0) && 793 eh->ether_type != htons(ETHERTYPE_PAE)) { 794 /* 795 * Drop unencrypted frames. 796 */ 797 vap->iv_stats.is_rx_unencrypted++; 798 IEEE80211_NODE_STAT(ni, rx_unencrypted); 799 goto out; 800 } 801 } 802 /* XXX require HT? */ 803 if (qos & IEEE80211_QOS_AMSDU) { 804 m = ieee80211_decap_amsdu(ni, m); 805 if (m == NULL) 806 return IEEE80211_FC0_TYPE_DATA; 807 } else { 808 #ifdef IEEE80211_SUPPORT_SUPERG 809 m = ieee80211_decap_fastframe(vap, ni, m); 810 if (m == NULL) 811 return IEEE80211_FC0_TYPE_DATA; 812 #endif 813 } 814 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 815 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 816 else 817 hostap_deliver_data(vap, ni, m); 818 return IEEE80211_FC0_TYPE_DATA; 819 820 case IEEE80211_FC0_TYPE_MGT: 821 vap->iv_stats.is_rx_mgmt++; 822 IEEE80211_NODE_STAT(ni, rx_mgmt); 823 if (dir != IEEE80211_FC1_DIR_NODS) { 824 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 825 wh, "mgt", "incorrect dir 0x%x", dir); 826 vap->iv_stats.is_rx_wrongdir++; 827 goto err; 828 } 829 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 830 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 831 ni->ni_macaddr, "mgt", "too short: len %u", 832 m->m_pkthdr.len); 833 vap->iv_stats.is_rx_tooshort++; 834 goto out; 835 } 836 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 837 /* ensure return frames are unicast */ 838 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 839 wh, NULL, "source is multicast: %s", 840 ether_sprintf(wh->i_addr2)); 841 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 842 goto out; 843 } 844 #ifdef IEEE80211_DEBUG 845 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 846 ieee80211_msg_dumppkts(vap)) { 847 if_printf(ifp, "received %s from %s rssi %d\n", 848 ieee80211_mgt_subtype_name[subtype >> 849 IEEE80211_FC0_SUBTYPE_SHIFT], 850 ether_sprintf(wh->i_addr2), rssi); 851 } 852 #endif 853 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 854 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 855 /* 856 * Only shared key auth frames with a challenge 857 * should be encrypted, discard all others. 858 */ 859 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 860 wh, NULL, 861 "%s", "WEP set but not permitted"); 862 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 863 goto out; 864 } 865 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 866 /* 867 * Discard encrypted frames when privacy is off. 868 */ 869 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 870 wh, NULL, "%s", "WEP set but PRIVACY off"); 871 vap->iv_stats.is_rx_noprivacy++; 872 goto out; 873 } 874 hdrspace = ieee80211_hdrspace(ic, wh); 875 key = ieee80211_crypto_decap(ni, m, hdrspace); 876 if (key == NULL) { 877 /* NB: stats+msgs handled in crypto_decap */ 878 goto out; 879 } 880 wh = mtod(m, struct ieee80211_frame *); 881 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 882 } 883 /* 884 * Pass the packet to radiotap before calling iv_recv_mgmt(). 885 * Otherwise iv_recv_mgmt() might pass another packet to 886 * radiotap, resulting in out of order packet captures. 887 */ 888 if (ieee80211_radiotap_active_vap(vap)) 889 ieee80211_radiotap_rx(vap, m); 890 need_tap = 0; 891 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 892 goto out; 893 894 case IEEE80211_FC0_TYPE_CTL: 895 vap->iv_stats.is_rx_ctl++; 896 IEEE80211_NODE_STAT(ni, rx_ctrl); 897 vap->iv_recv_ctl(ni, m, subtype); 898 goto out; 899 default: 900 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 901 wh, "bad", "frame type 0x%x", type); 902 /* should not come here */ 903 break; 904 } 905 err: 906 ifp->if_ierrors++; 907 out: 908 if (m != NULL) { 909 if (need_tap && ieee80211_radiotap_active_vap(vap)) 910 ieee80211_radiotap_rx(vap, m); 911 m_freem(m); 912 } 913 return type; 914 } 915 916 static void 917 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 918 int rssi, int nf, uint16_t seq, uint16_t status) 919 { 920 struct ieee80211vap *vap = ni->ni_vap; 921 922 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 923 924 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 925 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 926 ni->ni_macaddr, "open auth", 927 "bad sta auth mode %u", ni->ni_authmode); 928 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 929 /* 930 * Clear any challenge text that may be there if 931 * a previous shared key auth failed and then an 932 * open auth is attempted. 933 */ 934 if (ni->ni_challenge != NULL) { 935 free(ni->ni_challenge, M_80211_NODE); 936 ni->ni_challenge = NULL; 937 } 938 /* XXX hack to workaround calling convention */ 939 ieee80211_send_error(ni, wh->i_addr2, 940 IEEE80211_FC0_SUBTYPE_AUTH, 941 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 942 return; 943 } 944 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 945 vap->iv_stats.is_rx_bad_auth++; 946 return; 947 } 948 /* always accept open authentication requests */ 949 if (ni == vap->iv_bss) { 950 ni = ieee80211_dup_bss(vap, wh->i_addr2); 951 if (ni == NULL) 952 return; 953 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 954 (void) ieee80211_ref_node(ni); 955 /* 956 * Mark the node as referenced to reflect that it's 957 * reference count has been bumped to insure it remains 958 * after the transaction completes. 959 */ 960 ni->ni_flags |= IEEE80211_NODE_AREF; 961 /* 962 * Mark the node as requiring a valid association id 963 * before outbound traffic is permitted. 964 */ 965 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 966 967 if (vap->iv_acl != NULL && 968 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 969 /* 970 * When the ACL policy is set to RADIUS we defer the 971 * authorization to a user agent. Dispatch an event, 972 * a subsequent MLME call will decide the fate of the 973 * station. If the user agent is not present then the 974 * node will be reclaimed due to inactivity. 975 */ 976 IEEE80211_NOTE_MAC(vap, 977 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 978 "%s", "station authentication defered (radius acl)"); 979 ieee80211_notify_node_auth(ni); 980 } else { 981 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 982 IEEE80211_NOTE_MAC(vap, 983 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 984 "%s", "station authenticated (open)"); 985 /* 986 * When 802.1x is not in use mark the port 987 * authorized at this point so traffic can flow. 988 */ 989 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 990 ieee80211_node_authorize(ni); 991 } 992 } 993 994 static void 995 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 996 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 997 uint16_t seq, uint16_t status) 998 { 999 struct ieee80211vap *vap = ni->ni_vap; 1000 uint8_t *challenge; 1001 int allocbs, estatus; 1002 1003 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1004 1005 /* 1006 * NB: this can happen as we allow pre-shared key 1007 * authentication to be enabled w/o wep being turned 1008 * on so that configuration of these can be done 1009 * in any order. It may be better to enforce the 1010 * ordering in which case this check would just be 1011 * for sanity/consistency. 1012 */ 1013 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1014 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1015 ni->ni_macaddr, "shared key auth", 1016 "%s", " PRIVACY is disabled"); 1017 estatus = IEEE80211_STATUS_ALG; 1018 goto bad; 1019 } 1020 /* 1021 * Pre-shared key authentication is evil; accept 1022 * it only if explicitly configured (it is supported 1023 * mainly for compatibility with clients like Mac OS X). 1024 */ 1025 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1026 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1027 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1028 ni->ni_macaddr, "shared key auth", 1029 "bad sta auth mode %u", ni->ni_authmode); 1030 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1031 estatus = IEEE80211_STATUS_ALG; 1032 goto bad; 1033 } 1034 1035 challenge = NULL; 1036 if (frm + 1 < efrm) { 1037 if ((frm[1] + 2) > (efrm - frm)) { 1038 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1039 ni->ni_macaddr, "shared key auth", 1040 "ie %d/%d too long", 1041 frm[0], (frm[1] + 2) - (efrm - frm)); 1042 vap->iv_stats.is_rx_bad_auth++; 1043 estatus = IEEE80211_STATUS_CHALLENGE; 1044 goto bad; 1045 } 1046 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1047 challenge = frm; 1048 frm += frm[1] + 2; 1049 } 1050 switch (seq) { 1051 case IEEE80211_AUTH_SHARED_CHALLENGE: 1052 case IEEE80211_AUTH_SHARED_RESPONSE: 1053 if (challenge == NULL) { 1054 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1055 ni->ni_macaddr, "shared key auth", 1056 "%s", "no challenge"); 1057 vap->iv_stats.is_rx_bad_auth++; 1058 estatus = IEEE80211_STATUS_CHALLENGE; 1059 goto bad; 1060 } 1061 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1062 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1063 ni->ni_macaddr, "shared key auth", 1064 "bad challenge len %d", challenge[1]); 1065 vap->iv_stats.is_rx_bad_auth++; 1066 estatus = IEEE80211_STATUS_CHALLENGE; 1067 goto bad; 1068 } 1069 default: 1070 break; 1071 } 1072 switch (seq) { 1073 case IEEE80211_AUTH_SHARED_REQUEST: 1074 if (ni == vap->iv_bss) { 1075 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1076 if (ni == NULL) { 1077 /* NB: no way to return an error */ 1078 return; 1079 } 1080 allocbs = 1; 1081 } else { 1082 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1083 (void) ieee80211_ref_node(ni); 1084 allocbs = 0; 1085 } 1086 /* 1087 * Mark the node as referenced to reflect that it's 1088 * reference count has been bumped to insure it remains 1089 * after the transaction completes. 1090 */ 1091 ni->ni_flags |= IEEE80211_NODE_AREF; 1092 /* 1093 * Mark the node as requiring a valid associatio id 1094 * before outbound traffic is permitted. 1095 */ 1096 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1097 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1098 ni->ni_noise = nf; 1099 if (!ieee80211_alloc_challenge(ni)) { 1100 /* NB: don't return error so they rexmit */ 1101 return; 1102 } 1103 get_random_bytes(ni->ni_challenge, 1104 IEEE80211_CHALLENGE_LEN); 1105 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1106 ni, "shared key %sauth request", allocbs ? "" : "re"); 1107 /* 1108 * When the ACL policy is set to RADIUS we defer the 1109 * authorization to a user agent. Dispatch an event, 1110 * a subsequent MLME call will decide the fate of the 1111 * station. If the user agent is not present then the 1112 * node will be reclaimed due to inactivity. 1113 */ 1114 if (vap->iv_acl != NULL && 1115 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1116 IEEE80211_NOTE_MAC(vap, 1117 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1118 ni->ni_macaddr, 1119 "%s", "station authentication defered (radius acl)"); 1120 ieee80211_notify_node_auth(ni); 1121 return; 1122 } 1123 break; 1124 case IEEE80211_AUTH_SHARED_RESPONSE: 1125 if (ni == vap->iv_bss) { 1126 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1127 ni->ni_macaddr, "shared key response", 1128 "%s", "unknown station"); 1129 /* NB: don't send a response */ 1130 return; 1131 } 1132 if (ni->ni_challenge == NULL) { 1133 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1134 ni->ni_macaddr, "shared key response", 1135 "%s", "no challenge recorded"); 1136 vap->iv_stats.is_rx_bad_auth++; 1137 estatus = IEEE80211_STATUS_CHALLENGE; 1138 goto bad; 1139 } 1140 if (memcmp(ni->ni_challenge, &challenge[2], 1141 challenge[1]) != 0) { 1142 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1143 ni->ni_macaddr, "shared key response", 1144 "%s", "challenge mismatch"); 1145 vap->iv_stats.is_rx_auth_fail++; 1146 estatus = IEEE80211_STATUS_CHALLENGE; 1147 goto bad; 1148 } 1149 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1150 ni, "%s", "station authenticated (shared key)"); 1151 ieee80211_node_authorize(ni); 1152 break; 1153 default: 1154 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1155 ni->ni_macaddr, "shared key auth", 1156 "bad seq %d", seq); 1157 vap->iv_stats.is_rx_bad_auth++; 1158 estatus = IEEE80211_STATUS_SEQUENCE; 1159 goto bad; 1160 } 1161 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1162 return; 1163 bad: 1164 /* 1165 * Send an error response; but only when operating as an AP. 1166 */ 1167 /* XXX hack to workaround calling convention */ 1168 ieee80211_send_error(ni, wh->i_addr2, 1169 IEEE80211_FC0_SUBTYPE_AUTH, 1170 (seq + 1) | (estatus<<16)); 1171 } 1172 1173 /* 1174 * Convert a WPA cipher selector OUI to an internal 1175 * cipher algorithm. Where appropriate we also 1176 * record any key length. 1177 */ 1178 static int 1179 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1180 { 1181 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1182 uint32_t w = LE_READ_4(sel); 1183 1184 switch (w) { 1185 case WPA_SEL(WPA_CSE_NULL): 1186 return IEEE80211_CIPHER_NONE; 1187 case WPA_SEL(WPA_CSE_WEP40): 1188 if (keylen) 1189 *keylen = 40 / NBBY; 1190 return IEEE80211_CIPHER_WEP; 1191 case WPA_SEL(WPA_CSE_WEP104): 1192 if (keylen) 1193 *keylen = 104 / NBBY; 1194 return IEEE80211_CIPHER_WEP; 1195 case WPA_SEL(WPA_CSE_TKIP): 1196 return IEEE80211_CIPHER_TKIP; 1197 case WPA_SEL(WPA_CSE_CCMP): 1198 return IEEE80211_CIPHER_AES_CCM; 1199 } 1200 return 32; /* NB: so 1<< is discarded */ 1201 #undef WPA_SEL 1202 } 1203 1204 /* 1205 * Convert a WPA key management/authentication algorithm 1206 * to an internal code. 1207 */ 1208 static int 1209 wpa_keymgmt(const uint8_t *sel) 1210 { 1211 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1212 uint32_t w = LE_READ_4(sel); 1213 1214 switch (w) { 1215 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1216 return WPA_ASE_8021X_UNSPEC; 1217 case WPA_SEL(WPA_ASE_8021X_PSK): 1218 return WPA_ASE_8021X_PSK; 1219 case WPA_SEL(WPA_ASE_NONE): 1220 return WPA_ASE_NONE; 1221 } 1222 return 0; /* NB: so is discarded */ 1223 #undef WPA_SEL 1224 } 1225 1226 /* 1227 * Parse a WPA information element to collect parameters. 1228 * Note that we do not validate security parameters; that 1229 * is handled by the authenticator; the parsing done here 1230 * is just for internal use in making operational decisions. 1231 */ 1232 static int 1233 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1234 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1235 { 1236 uint8_t len = frm[1]; 1237 uint32_t w; 1238 int n; 1239 1240 /* 1241 * Check the length once for fixed parts: OUI, type, 1242 * version, mcast cipher, and 2 selector counts. 1243 * Other, variable-length data, must be checked separately. 1244 */ 1245 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1246 IEEE80211_DISCARD_IE(vap, 1247 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1248 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1249 return IEEE80211_REASON_IE_INVALID; 1250 } 1251 if (len < 14) { 1252 IEEE80211_DISCARD_IE(vap, 1253 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1254 wh, "WPA", "too short, len %u", len); 1255 return IEEE80211_REASON_IE_INVALID; 1256 } 1257 frm += 6, len -= 4; /* NB: len is payload only */ 1258 /* NB: iswpaoui already validated the OUI and type */ 1259 w = LE_READ_2(frm); 1260 if (w != WPA_VERSION) { 1261 IEEE80211_DISCARD_IE(vap, 1262 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1263 wh, "WPA", "bad version %u", w); 1264 return IEEE80211_REASON_IE_INVALID; 1265 } 1266 frm += 2, len -= 2; 1267 1268 memset(rsn, 0, sizeof(*rsn)); 1269 1270 /* multicast/group cipher */ 1271 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1272 frm += 4, len -= 4; 1273 1274 /* unicast ciphers */ 1275 n = LE_READ_2(frm); 1276 frm += 2, len -= 2; 1277 if (len < n*4+2) { 1278 IEEE80211_DISCARD_IE(vap, 1279 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1280 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1281 len, n); 1282 return IEEE80211_REASON_IE_INVALID; 1283 } 1284 w = 0; 1285 for (; n > 0; n--) { 1286 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1287 frm += 4, len -= 4; 1288 } 1289 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1290 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1291 else 1292 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1293 1294 /* key management algorithms */ 1295 n = LE_READ_2(frm); 1296 frm += 2, len -= 2; 1297 if (len < n*4) { 1298 IEEE80211_DISCARD_IE(vap, 1299 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1300 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1301 len, n); 1302 return IEEE80211_REASON_IE_INVALID; 1303 } 1304 w = 0; 1305 for (; n > 0; n--) { 1306 w |= wpa_keymgmt(frm); 1307 frm += 4, len -= 4; 1308 } 1309 if (w & WPA_ASE_8021X_UNSPEC) 1310 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1311 else 1312 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1313 1314 if (len > 2) /* optional capabilities */ 1315 rsn->rsn_caps = LE_READ_2(frm); 1316 1317 return 0; 1318 } 1319 1320 /* 1321 * Convert an RSN cipher selector OUI to an internal 1322 * cipher algorithm. Where appropriate we also 1323 * record any key length. 1324 */ 1325 static int 1326 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1327 { 1328 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1329 uint32_t w = LE_READ_4(sel); 1330 1331 switch (w) { 1332 case RSN_SEL(RSN_CSE_NULL): 1333 return IEEE80211_CIPHER_NONE; 1334 case RSN_SEL(RSN_CSE_WEP40): 1335 if (keylen) 1336 *keylen = 40 / NBBY; 1337 return IEEE80211_CIPHER_WEP; 1338 case RSN_SEL(RSN_CSE_WEP104): 1339 if (keylen) 1340 *keylen = 104 / NBBY; 1341 return IEEE80211_CIPHER_WEP; 1342 case RSN_SEL(RSN_CSE_TKIP): 1343 return IEEE80211_CIPHER_TKIP; 1344 case RSN_SEL(RSN_CSE_CCMP): 1345 return IEEE80211_CIPHER_AES_CCM; 1346 case RSN_SEL(RSN_CSE_WRAP): 1347 return IEEE80211_CIPHER_AES_OCB; 1348 } 1349 return 32; /* NB: so 1<< is discarded */ 1350 #undef WPA_SEL 1351 } 1352 1353 /* 1354 * Convert an RSN key management/authentication algorithm 1355 * to an internal code. 1356 */ 1357 static int 1358 rsn_keymgmt(const uint8_t *sel) 1359 { 1360 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1361 uint32_t w = LE_READ_4(sel); 1362 1363 switch (w) { 1364 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1365 return RSN_ASE_8021X_UNSPEC; 1366 case RSN_SEL(RSN_ASE_8021X_PSK): 1367 return RSN_ASE_8021X_PSK; 1368 case RSN_SEL(RSN_ASE_NONE): 1369 return RSN_ASE_NONE; 1370 } 1371 return 0; /* NB: so is discarded */ 1372 #undef RSN_SEL 1373 } 1374 1375 /* 1376 * Parse a WPA/RSN information element to collect parameters 1377 * and validate the parameters against what has been 1378 * configured for the system. 1379 */ 1380 static int 1381 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1382 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1383 { 1384 uint8_t len = frm[1]; 1385 uint32_t w; 1386 int n; 1387 1388 /* 1389 * Check the length once for fixed parts: 1390 * version, mcast cipher, and 2 selector counts. 1391 * Other, variable-length data, must be checked separately. 1392 */ 1393 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1394 IEEE80211_DISCARD_IE(vap, 1395 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1396 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1397 return IEEE80211_REASON_IE_INVALID; 1398 } 1399 if (len < 10) { 1400 IEEE80211_DISCARD_IE(vap, 1401 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1402 wh, "RSN", "too short, len %u", len); 1403 return IEEE80211_REASON_IE_INVALID; 1404 } 1405 frm += 2; 1406 w = LE_READ_2(frm); 1407 if (w != RSN_VERSION) { 1408 IEEE80211_DISCARD_IE(vap, 1409 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1410 wh, "RSN", "bad version %u", w); 1411 return IEEE80211_REASON_IE_INVALID; 1412 } 1413 frm += 2, len -= 2; 1414 1415 memset(rsn, 0, sizeof(*rsn)); 1416 1417 /* multicast/group cipher */ 1418 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1419 frm += 4, len -= 4; 1420 1421 /* unicast ciphers */ 1422 n = LE_READ_2(frm); 1423 frm += 2, len -= 2; 1424 if (len < n*4+2) { 1425 IEEE80211_DISCARD_IE(vap, 1426 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1427 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1428 len, n); 1429 return IEEE80211_REASON_IE_INVALID; 1430 } 1431 w = 0; 1432 for (; n > 0; n--) { 1433 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1434 frm += 4, len -= 4; 1435 } 1436 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1437 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1438 else 1439 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1440 1441 /* key management algorithms */ 1442 n = LE_READ_2(frm); 1443 frm += 2, len -= 2; 1444 if (len < n*4) { 1445 IEEE80211_DISCARD_IE(vap, 1446 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1447 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1448 len, n); 1449 return IEEE80211_REASON_IE_INVALID; 1450 } 1451 w = 0; 1452 for (; n > 0; n--) { 1453 w |= rsn_keymgmt(frm); 1454 frm += 4, len -= 4; 1455 } 1456 if (w & RSN_ASE_8021X_UNSPEC) 1457 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1458 else 1459 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1460 1461 /* optional RSN capabilities */ 1462 if (len > 2) 1463 rsn->rsn_caps = LE_READ_2(frm); 1464 /* XXXPMKID */ 1465 1466 return 0; 1467 } 1468 1469 /* 1470 * WPA/802.11i assocation request processing. 1471 */ 1472 static int 1473 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1474 const struct ieee80211_frame *wh, const uint8_t *wpa, 1475 const uint8_t *rsn, uint16_t capinfo) 1476 { 1477 struct ieee80211vap *vap = ni->ni_vap; 1478 uint8_t reason; 1479 int badwparsn; 1480 1481 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1482 if (wpa == NULL && rsn == NULL) { 1483 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1484 /* 1485 * W-Fi Protected Setup (WPS) permits 1486 * clients to associate and pass EAPOL frames 1487 * to establish initial credentials. 1488 */ 1489 ni->ni_flags |= IEEE80211_NODE_WPS; 1490 return 1; 1491 } 1492 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1493 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1494 /* 1495 * Transitional Security Network. Permits clients 1496 * to associate and use WEP while WPA is configured. 1497 */ 1498 ni->ni_flags |= IEEE80211_NODE_TSN; 1499 return 1; 1500 } 1501 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1502 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1503 vap->iv_stats.is_rx_assoc_badwpaie++; 1504 reason = IEEE80211_REASON_IE_INVALID; 1505 goto bad; 1506 } 1507 /* assert right association security credentials */ 1508 badwparsn = 0; /* NB: to silence compiler */ 1509 switch (vap->iv_flags & IEEE80211_F_WPA) { 1510 case IEEE80211_F_WPA1: 1511 badwparsn = (wpa == NULL); 1512 break; 1513 case IEEE80211_F_WPA2: 1514 badwparsn = (rsn == NULL); 1515 break; 1516 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1517 badwparsn = (wpa == NULL && rsn == NULL); 1518 break; 1519 } 1520 if (badwparsn) { 1521 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1522 wh, NULL, 1523 "%s", "missing WPA/RSN IE in association request"); 1524 vap->iv_stats.is_rx_assoc_badwpaie++; 1525 reason = IEEE80211_REASON_IE_INVALID; 1526 goto bad; 1527 } 1528 /* 1529 * Parse WPA/RSN information element. 1530 */ 1531 if (wpa != NULL) 1532 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1533 else 1534 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1535 if (reason != 0) { 1536 /* XXX distinguish WPA/RSN? */ 1537 vap->iv_stats.is_rx_assoc_badwpaie++; 1538 goto bad; 1539 } 1540 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1541 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1542 wpa != NULL ? "WPA" : "RSN", 1543 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1544 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1545 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1546 1547 return 1; 1548 bad: 1549 ieee80211_node_deauth(ni, reason); 1550 return 0; 1551 } 1552 1553 /* XXX find a better place for definition */ 1554 struct l2_update_frame { 1555 struct ether_header eh; 1556 uint8_t dsap; 1557 uint8_t ssap; 1558 uint8_t control; 1559 uint8_t xid[3]; 1560 } __packed; 1561 1562 /* 1563 * Deliver a TGf L2UF frame on behalf of a station. 1564 * This primes any bridge when the station is roaming 1565 * between ap's on the same wired network. 1566 */ 1567 static void 1568 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1569 { 1570 struct ieee80211vap *vap = ni->ni_vap; 1571 struct ifnet *ifp = vap->iv_ifp; 1572 struct mbuf *m; 1573 struct l2_update_frame *l2uf; 1574 struct ether_header *eh; 1575 1576 m = m_gethdr(M_NOWAIT, MT_DATA); 1577 if (m == NULL) { 1578 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1579 "%s", "no mbuf for l2uf frame"); 1580 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1581 return; 1582 } 1583 l2uf = mtod(m, struct l2_update_frame *); 1584 eh = &l2uf->eh; 1585 /* dst: Broadcast address */ 1586 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1587 /* src: associated STA */ 1588 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1589 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1590 1591 l2uf->dsap = 0; 1592 l2uf->ssap = 0; 1593 l2uf->control = 0xf5; 1594 l2uf->xid[0] = 0x81; 1595 l2uf->xid[1] = 0x80; 1596 l2uf->xid[2] = 0x00; 1597 1598 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1599 hostap_deliver_data(vap, ni, m); 1600 } 1601 1602 static void 1603 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1604 int reassoc, int resp, const char *tag, int rate) 1605 { 1606 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1607 "deny %s request, %s rate set mismatch, rate/MCS %d", 1608 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1609 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1610 ieee80211_node_leave(ni); 1611 } 1612 1613 static void 1614 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1615 int reassoc, int resp, const char *tag, int capinfo) 1616 { 1617 struct ieee80211vap *vap = ni->ni_vap; 1618 1619 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1620 "deny %s request, %s mismatch 0x%x", 1621 reassoc ? "reassoc" : "assoc", tag, capinfo); 1622 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1623 ieee80211_node_leave(ni); 1624 vap->iv_stats.is_rx_assoc_capmismatch++; 1625 } 1626 1627 static void 1628 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1629 int reassoc, int resp) 1630 { 1631 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1632 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1633 /* XXX no better code */ 1634 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1635 ieee80211_node_leave(ni); 1636 } 1637 1638 static void 1639 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1640 int algo, int seq, int status) 1641 { 1642 struct ieee80211vap *vap = ni->ni_vap; 1643 1644 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1645 wh, NULL, "unsupported alg %d", algo); 1646 vap->iv_stats.is_rx_auth_unsupported++; 1647 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1648 seq | (status << 16)); 1649 } 1650 1651 static __inline int 1652 ishtmixed(const uint8_t *ie) 1653 { 1654 const struct ieee80211_ie_htinfo *ht = 1655 (const struct ieee80211_ie_htinfo *) ie; 1656 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1657 IEEE80211_HTINFO_OPMODE_MIXED; 1658 } 1659 1660 static int 1661 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1662 { 1663 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1664 int i; 1665 1666 /* NB: the 11b clients we care about will not have xrates */ 1667 if (xrates != NULL || rates == NULL) 1668 return 0; 1669 for (i = 0; i < rates[1]; i++) { 1670 int r = rates[2+i] & IEEE80211_RATE_VAL; 1671 if (r > 2*11 || ((1<<r) & brates) == 0) 1672 return 0; 1673 } 1674 return 1; 1675 } 1676 1677 static void 1678 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1679 int subtype, int rssi, int nf) 1680 { 1681 struct ieee80211vap *vap = ni->ni_vap; 1682 struct ieee80211com *ic = ni->ni_ic; 1683 struct ieee80211_frame *wh; 1684 uint8_t *frm, *efrm, *sfrm; 1685 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1686 int reassoc, resp; 1687 uint8_t rate; 1688 1689 wh = mtod(m0, struct ieee80211_frame *); 1690 frm = (uint8_t *)&wh[1]; 1691 efrm = mtod(m0, uint8_t *) + m0->m_len; 1692 switch (subtype) { 1693 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1694 case IEEE80211_FC0_SUBTYPE_BEACON: { 1695 struct ieee80211_scanparams scan; 1696 /* 1697 * We process beacon/probe response frames when scanning; 1698 * otherwise we check beacon frames for overlapping non-ERP 1699 * BSS in 11g and/or overlapping legacy BSS when in HT. 1700 */ 1701 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1702 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1703 vap->iv_stats.is_rx_mgtdiscard++; 1704 return; 1705 } 1706 /* NB: accept off-channel frames */ 1707 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1708 return; 1709 /* 1710 * Count frame now that we know it's to be processed. 1711 */ 1712 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1713 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1714 IEEE80211_NODE_STAT(ni, rx_beacons); 1715 } else 1716 IEEE80211_NODE_STAT(ni, rx_proberesp); 1717 /* 1718 * If scanning, just pass information to the scan module. 1719 */ 1720 if (ic->ic_flags & IEEE80211_F_SCAN) { 1721 if (scan.status == 0 && /* NB: on channel */ 1722 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1723 /* 1724 * Actively scanning a channel marked passive; 1725 * send a probe request now that we know there 1726 * is 802.11 traffic present. 1727 * 1728 * XXX check if the beacon we recv'd gives 1729 * us what we need and suppress the probe req 1730 */ 1731 ieee80211_probe_curchan(vap, 1); 1732 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1733 } 1734 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1735 return; 1736 } 1737 /* 1738 * Check beacon for overlapping bss w/ non ERP stations. 1739 * If we detect one and protection is configured but not 1740 * enabled, enable it and start a timer that'll bring us 1741 * out if we stop seeing the bss. 1742 */ 1743 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1744 scan.status == 0 && /* NB: on-channel */ 1745 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1746 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1747 ic->ic_lastnonerp = ticks; 1748 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1749 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1750 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1751 IEEE80211_NOTE_FRAME(vap, 1752 IEEE80211_MSG_ASSOC, wh, 1753 "non-ERP present on channel %d " 1754 "(saw erp 0x%x from channel %d), " 1755 "enable use of protection", 1756 ic->ic_curchan->ic_ieee, 1757 scan.erp, scan.chan); 1758 ic->ic_flags |= IEEE80211_F_USEPROT; 1759 ieee80211_notify_erp(ic); 1760 } 1761 } 1762 /* 1763 * Check beacon for non-HT station on HT channel 1764 * and update HT BSS occupancy as appropriate. 1765 */ 1766 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1767 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1768 /* 1769 * Off control channel; only check frames 1770 * that come in the extension channel when 1771 * operating w/ HT40. 1772 */ 1773 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1774 break; 1775 if (scan.chan != ic->ic_curchan->ic_extieee) 1776 break; 1777 } 1778 if (scan.htinfo == NULL) { 1779 ieee80211_htprot_update(ic, 1780 IEEE80211_HTINFO_OPMODE_PROTOPT | 1781 IEEE80211_HTINFO_NONHT_PRESENT); 1782 } else if (ishtmixed(scan.htinfo)) { 1783 /* XXX? take NONHT_PRESENT from beacon? */ 1784 ieee80211_htprot_update(ic, 1785 IEEE80211_HTINFO_OPMODE_MIXED | 1786 IEEE80211_HTINFO_NONHT_PRESENT); 1787 } 1788 } 1789 break; 1790 } 1791 1792 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1793 if (vap->iv_state != IEEE80211_S_RUN) { 1794 vap->iv_stats.is_rx_mgtdiscard++; 1795 return; 1796 } 1797 /* 1798 * Consult the ACL policy module if setup. 1799 */ 1800 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1801 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1802 wh, NULL, "%s", "disallowed by ACL"); 1803 vap->iv_stats.is_rx_acl++; 1804 return; 1805 } 1806 /* 1807 * prreq frame format 1808 * [tlv] ssid 1809 * [tlv] supported rates 1810 * [tlv] extended supported rates 1811 */ 1812 ssid = rates = xrates = NULL; 1813 sfrm = frm; 1814 while (efrm - frm > 1) { 1815 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1816 switch (*frm) { 1817 case IEEE80211_ELEMID_SSID: 1818 ssid = frm; 1819 break; 1820 case IEEE80211_ELEMID_RATES: 1821 rates = frm; 1822 break; 1823 case IEEE80211_ELEMID_XRATES: 1824 xrates = frm; 1825 break; 1826 } 1827 frm += frm[1] + 2; 1828 } 1829 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1830 if (xrates != NULL) 1831 IEEE80211_VERIFY_ELEMENT(xrates, 1832 IEEE80211_RATE_MAXSIZE - rates[1], return); 1833 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1834 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1835 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1836 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1837 wh, NULL, 1838 "%s", "no ssid with ssid suppression enabled"); 1839 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1840 return; 1841 } 1842 1843 /* XXX find a better class or define it's own */ 1844 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1845 "%s", "recv probe req"); 1846 /* 1847 * Some legacy 11b clients cannot hack a complete 1848 * probe response frame. When the request includes 1849 * only a bare-bones rate set, communicate this to 1850 * the transmit side. 1851 */ 1852 ieee80211_send_proberesp(vap, wh->i_addr2, 1853 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1854 break; 1855 1856 case IEEE80211_FC0_SUBTYPE_AUTH: { 1857 uint16_t algo, seq, status; 1858 1859 if (vap->iv_state != IEEE80211_S_RUN) { 1860 vap->iv_stats.is_rx_mgtdiscard++; 1861 return; 1862 } 1863 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1864 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1865 wh, NULL, "%s", "wrong bssid"); 1866 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1867 return; 1868 } 1869 /* 1870 * auth frame format 1871 * [2] algorithm 1872 * [2] sequence 1873 * [2] status 1874 * [tlv*] challenge 1875 */ 1876 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1877 algo = le16toh(*(uint16_t *)frm); 1878 seq = le16toh(*(uint16_t *)(frm + 2)); 1879 status = le16toh(*(uint16_t *)(frm + 4)); 1880 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1881 "recv auth frame with algorithm %d seq %d", algo, seq); 1882 /* 1883 * Consult the ACL policy module if setup. 1884 */ 1885 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1886 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1887 wh, NULL, "%s", "disallowed by ACL"); 1888 vap->iv_stats.is_rx_acl++; 1889 ieee80211_send_error(ni, wh->i_addr2, 1890 IEEE80211_FC0_SUBTYPE_AUTH, 1891 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1892 return; 1893 } 1894 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1895 IEEE80211_DISCARD(vap, 1896 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1897 wh, NULL, "%s", "TKIP countermeasures enabled"); 1898 vap->iv_stats.is_rx_auth_countermeasures++; 1899 ieee80211_send_error(ni, wh->i_addr2, 1900 IEEE80211_FC0_SUBTYPE_AUTH, 1901 IEEE80211_REASON_MIC_FAILURE); 1902 return; 1903 } 1904 if (algo == IEEE80211_AUTH_ALG_SHARED) 1905 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1906 seq, status); 1907 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1908 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1909 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1910 authalgreject(ni, wh, algo, 1911 seq+1, IEEE80211_STATUS_ALG); 1912 return; 1913 } else { 1914 /* 1915 * We assume that an unknown algorithm is the result 1916 * of a decryption failure on a shared key auth frame; 1917 * return a status code appropriate for that instead 1918 * of IEEE80211_STATUS_ALG. 1919 * 1920 * NB: a seq# of 4 is intentional; the decrypted 1921 * frame likely has a bogus seq value. 1922 */ 1923 authalgreject(ni, wh, algo, 1924 4, IEEE80211_STATUS_CHALLENGE); 1925 return; 1926 } 1927 break; 1928 } 1929 1930 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1931 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1932 uint16_t capinfo, lintval; 1933 struct ieee80211_rsnparms rsnparms; 1934 1935 if (vap->iv_state != IEEE80211_S_RUN) { 1936 vap->iv_stats.is_rx_mgtdiscard++; 1937 return; 1938 } 1939 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1940 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1941 wh, NULL, "%s", "wrong bssid"); 1942 vap->iv_stats.is_rx_assoc_bss++; 1943 return; 1944 } 1945 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1946 reassoc = 1; 1947 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1948 } else { 1949 reassoc = 0; 1950 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1951 } 1952 if (ni == vap->iv_bss) { 1953 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1954 "deny %s request, sta not authenticated", 1955 reassoc ? "reassoc" : "assoc"); 1956 ieee80211_send_error(ni, wh->i_addr2, 1957 IEEE80211_FC0_SUBTYPE_DEAUTH, 1958 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1959 vap->iv_stats.is_rx_assoc_notauth++; 1960 return; 1961 } 1962 1963 /* 1964 * asreq frame format 1965 * [2] capability information 1966 * [2] listen interval 1967 * [6*] current AP address (reassoc only) 1968 * [tlv] ssid 1969 * [tlv] supported rates 1970 * [tlv] extended supported rates 1971 * [tlv] WPA or RSN 1972 * [tlv] HT capabilities 1973 * [tlv] Atheros capabilities 1974 */ 1975 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1976 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1977 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1978 if (reassoc) 1979 frm += 6; /* ignore current AP info */ 1980 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1981 sfrm = frm; 1982 while (efrm - frm > 1) { 1983 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1984 switch (*frm) { 1985 case IEEE80211_ELEMID_SSID: 1986 ssid = frm; 1987 break; 1988 case IEEE80211_ELEMID_RATES: 1989 rates = frm; 1990 break; 1991 case IEEE80211_ELEMID_XRATES: 1992 xrates = frm; 1993 break; 1994 case IEEE80211_ELEMID_RSN: 1995 rsn = frm; 1996 break; 1997 case IEEE80211_ELEMID_HTCAP: 1998 htcap = frm; 1999 break; 2000 case IEEE80211_ELEMID_VENDOR: 2001 if (iswpaoui(frm)) 2002 wpa = frm; 2003 else if (iswmeinfo(frm)) 2004 wme = frm; 2005 #ifdef IEEE80211_SUPPORT_SUPERG 2006 else if (isatherosoui(frm)) 2007 ath = frm; 2008 #endif 2009 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2010 if (ishtcapoui(frm) && htcap == NULL) 2011 htcap = frm; 2012 } 2013 break; 2014 } 2015 frm += frm[1] + 2; 2016 } 2017 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2018 if (xrates != NULL) 2019 IEEE80211_VERIFY_ELEMENT(xrates, 2020 IEEE80211_RATE_MAXSIZE - rates[1], return); 2021 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2022 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2023 if (htcap != NULL) { 2024 IEEE80211_VERIFY_LENGTH(htcap[1], 2025 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2026 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2027 sizeof(struct ieee80211_ie_htcap)-2, 2028 return); /* XXX just NULL out? */ 2029 } 2030 2031 if ((vap->iv_flags & IEEE80211_F_WPA) && 2032 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2033 return; 2034 /* discard challenge after association */ 2035 if (ni->ni_challenge != NULL) { 2036 free(ni->ni_challenge, M_80211_NODE); 2037 ni->ni_challenge = NULL; 2038 } 2039 /* NB: 802.11 spec says to ignore station's privacy bit */ 2040 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2041 capinfomismatch(ni, wh, reassoc, resp, 2042 "capability", capinfo); 2043 return; 2044 } 2045 /* 2046 * Disallow re-associate w/ invalid slot time setting. 2047 */ 2048 if (ni->ni_associd != 0 && 2049 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2050 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2051 capinfomismatch(ni, wh, reassoc, resp, 2052 "slot time", capinfo); 2053 return; 2054 } 2055 rate = ieee80211_setup_rates(ni, rates, xrates, 2056 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2057 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2058 if (rate & IEEE80211_RATE_BASIC) { 2059 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2060 vap->iv_stats.is_rx_assoc_norate++; 2061 return; 2062 } 2063 /* 2064 * If constrained to 11g-only stations reject an 2065 * 11b-only station. We cheat a bit here by looking 2066 * at the max negotiated xmit rate and assuming anyone 2067 * with a best rate <24Mb/s is an 11b station. 2068 */ 2069 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2070 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2071 vap->iv_stats.is_rx_assoc_norate++; 2072 return; 2073 } 2074 /* 2075 * Do HT rate set handling and setup HT node state. 2076 */ 2077 ni->ni_chan = vap->iv_bss->ni_chan; 2078 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2079 rate = ieee80211_setup_htrates(ni, htcap, 2080 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2081 IEEE80211_F_DOBRS); 2082 if (rate & IEEE80211_RATE_BASIC) { 2083 ratesetmismatch(ni, wh, reassoc, resp, 2084 "HT", rate); 2085 vap->iv_stats.is_ht_assoc_norate++; 2086 return; 2087 } 2088 ieee80211_ht_node_init(ni); 2089 ieee80211_ht_updatehtcap(ni, htcap); 2090 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2091 ieee80211_ht_node_cleanup(ni); 2092 #ifdef IEEE80211_SUPPORT_SUPERG 2093 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2094 ieee80211_ff_node_cleanup(ni); 2095 #endif 2096 /* 2097 * Allow AMPDU operation only with unencrypted traffic 2098 * or AES-CCM; the 11n spec only specifies these ciphers 2099 * so permitting any others is undefined and can lead 2100 * to interoperability problems. 2101 */ 2102 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2103 (((vap->iv_flags & IEEE80211_F_WPA) && 2104 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2105 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2106 IEEE80211_NOTE(vap, 2107 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2108 "disallow HT use because WEP or TKIP requested, " 2109 "capinfo 0x%x ucastcipher %d", capinfo, 2110 rsnparms.rsn_ucastcipher); 2111 ieee80211_ht_node_cleanup(ni); 2112 vap->iv_stats.is_ht_assoc_downgrade++; 2113 } 2114 /* 2115 * If constrained to 11n-only stations reject legacy stations. 2116 */ 2117 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2118 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2119 htcapmismatch(ni, wh, reassoc, resp); 2120 vap->iv_stats.is_ht_assoc_nohtcap++; 2121 return; 2122 } 2123 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2124 ni->ni_noise = nf; 2125 ni->ni_intval = lintval; 2126 ni->ni_capinfo = capinfo; 2127 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2128 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2129 /* 2130 * Store the IEs. 2131 * XXX maybe better to just expand 2132 */ 2133 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2134 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2135 if (wpa != NULL) 2136 setie(wpa_ie, wpa - sfrm); 2137 if (rsn != NULL) 2138 setie(rsn_ie, rsn - sfrm); 2139 if (htcap != NULL) 2140 setie(htcap_ie, htcap - sfrm); 2141 if (wme != NULL) { 2142 setie(wme_ie, wme - sfrm); 2143 /* 2144 * Mark node as capable of QoS. 2145 */ 2146 ni->ni_flags |= IEEE80211_NODE_QOS; 2147 } else 2148 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2149 #ifdef IEEE80211_SUPPORT_SUPERG 2150 if (ath != NULL) { 2151 setie(ath_ie, ath - sfrm); 2152 /* 2153 * Parse ATH station parameters. 2154 */ 2155 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2156 } else 2157 #endif 2158 ni->ni_ath_flags = 0; 2159 #undef setie 2160 } else { 2161 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2162 ni->ni_ath_flags = 0; 2163 } 2164 ieee80211_node_join(ni, resp); 2165 ieee80211_deliver_l2uf(ni); 2166 break; 2167 } 2168 2169 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2170 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2171 uint16_t reason; 2172 2173 if (vap->iv_state != IEEE80211_S_RUN || 2174 /* NB: can happen when in promiscuous mode */ 2175 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2176 vap->iv_stats.is_rx_mgtdiscard++; 2177 break; 2178 } 2179 /* 2180 * deauth/disassoc frame format 2181 * [2] reason 2182 */ 2183 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2184 reason = le16toh(*(uint16_t *)frm); 2185 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2186 vap->iv_stats.is_rx_deauth++; 2187 IEEE80211_NODE_STAT(ni, rx_deauth); 2188 } else { 2189 vap->iv_stats.is_rx_disassoc++; 2190 IEEE80211_NODE_STAT(ni, rx_disassoc); 2191 } 2192 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2193 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2194 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2195 if (ni != vap->iv_bss) 2196 ieee80211_node_leave(ni); 2197 break; 2198 } 2199 2200 case IEEE80211_FC0_SUBTYPE_ACTION: 2201 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2202 if (ni == vap->iv_bss) { 2203 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2204 wh, NULL, "%s", "unknown node"); 2205 vap->iv_stats.is_rx_mgtdiscard++; 2206 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2207 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2208 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2209 wh, NULL, "%s", "not for us"); 2210 vap->iv_stats.is_rx_mgtdiscard++; 2211 } else if (vap->iv_state != IEEE80211_S_RUN) { 2212 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2213 wh, NULL, "wrong state %s", 2214 ieee80211_state_name[vap->iv_state]); 2215 vap->iv_stats.is_rx_mgtdiscard++; 2216 } else { 2217 if (ieee80211_parse_action(ni, m0) == 0) 2218 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2219 } 2220 break; 2221 2222 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2223 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2224 case IEEE80211_FC0_SUBTYPE_ATIM: 2225 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2226 wh, NULL, "%s", "not handled"); 2227 vap->iv_stats.is_rx_mgtdiscard++; 2228 break; 2229 2230 default: 2231 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2232 wh, "mgt", "subtype 0x%x not handled", subtype); 2233 vap->iv_stats.is_rx_badsubtype++; 2234 break; 2235 } 2236 } 2237 2238 static void 2239 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2240 { 2241 switch (subtype) { 2242 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2243 hostap_recv_pspoll(ni, m); 2244 break; 2245 case IEEE80211_FC0_SUBTYPE_BAR: 2246 ieee80211_recv_bar(ni, m); 2247 break; 2248 } 2249 } 2250 2251 /* 2252 * Process a received ps-poll frame. 2253 */ 2254 static void 2255 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2256 { 2257 struct ieee80211vap *vap = ni->ni_vap; 2258 struct ieee80211_frame_min *wh; 2259 struct ifnet *ifp; 2260 struct mbuf *m; 2261 uint16_t aid; 2262 int qlen; 2263 2264 wh = mtod(m0, struct ieee80211_frame_min *); 2265 if (ni->ni_associd == 0) { 2266 IEEE80211_DISCARD(vap, 2267 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2268 (struct ieee80211_frame *) wh, NULL, 2269 "%s", "unassociated station"); 2270 vap->iv_stats.is_ps_unassoc++; 2271 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2272 IEEE80211_REASON_NOT_ASSOCED); 2273 return; 2274 } 2275 2276 aid = le16toh(*(uint16_t *)wh->i_dur); 2277 if (aid != ni->ni_associd) { 2278 IEEE80211_DISCARD(vap, 2279 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2280 (struct ieee80211_frame *) wh, NULL, 2281 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2282 ni->ni_associd, aid); 2283 vap->iv_stats.is_ps_badaid++; 2284 /* 2285 * NB: We used to deauth the station but it turns out 2286 * the Blackberry Curve 8230 (and perhaps other devices) 2287 * sometimes send the wrong AID when WME is negotiated. 2288 * Being more lenient here seems ok as we already check 2289 * the station is associated and we only return frames 2290 * queued for the station (i.e. we don't use the AID). 2291 */ 2292 return; 2293 } 2294 2295 /* Okay, take the first queued packet and put it out... */ 2296 m = ieee80211_node_psq_dequeue(ni, &qlen); 2297 if (m == NULL) { 2298 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2299 "%s", "recv ps-poll, but queue empty"); 2300 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2301 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2302 if (vap->iv_set_tim != NULL) 2303 vap->iv_set_tim(ni, 0); /* just in case */ 2304 return; 2305 } 2306 /* 2307 * If there are more packets, set the more packets bit 2308 * in the packet dispatched to the station; otherwise 2309 * turn off the TIM bit. 2310 */ 2311 if (qlen != 0) { 2312 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2313 "recv ps-poll, send packet, %u still queued", qlen); 2314 m->m_flags |= M_MORE_DATA; 2315 } else { 2316 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2317 "%s", "recv ps-poll, send packet, queue empty"); 2318 if (vap->iv_set_tim != NULL) 2319 vap->iv_set_tim(ni, 0); 2320 } 2321 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2322 2323 if (m->m_flags & M_ENCAP) 2324 ifp = vap->iv_ic->ic_ifp; 2325 else 2326 ifp = vap->iv_ifp; 2327 IF_ENQUEUE(&ifp->if_snd, m); 2328 if_start(ifp); 2329 } 2330