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_var.h> 52 #include <net/if_media.h> 53 #include <net/if_llc.h> 54 #include <net/ethernet.h> 55 56 #include <net/bpf.h> 57 58 #include <net80211/ieee80211_var.h> 59 #include <net80211/ieee80211_hostap.h> 60 #include <net80211/ieee80211_input.h> 61 #ifdef IEEE80211_SUPPORT_SUPERG 62 #include <net80211/ieee80211_superg.h> 63 #endif 64 #include <net80211/ieee80211_wds.h> 65 66 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 67 68 static void hostap_vattach(struct ieee80211vap *); 69 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 71 const struct ieee80211_rx_stats *, 72 int rssi, int nf); 73 static void hostap_deliver_data(struct ieee80211vap *, 74 struct ieee80211_node *, struct mbuf *); 75 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf); 77 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 78 79 void 80 ieee80211_hostap_attach(struct ieee80211com *ic) 81 { 82 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 83 } 84 85 void 86 ieee80211_hostap_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 hostap_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 hostap_vattach(struct ieee80211vap *vap) 97 { 98 vap->iv_newstate = hostap_newstate; 99 vap->iv_input = hostap_input; 100 vap->iv_recv_mgmt = hostap_recv_mgmt; 101 vap->iv_recv_ctl = hostap_recv_ctl; 102 vap->iv_opdetach = hostap_vdetach; 103 vap->iv_deliver_data = hostap_deliver_data; 104 vap->iv_recv_pspoll = ieee80211_recv_pspoll; 105 } 106 107 static void 108 sta_disassoc(void *arg, struct ieee80211_node *ni) 109 { 110 struct ieee80211vap *vap = arg; 111 112 if (ni->ni_vap == vap && ni->ni_associd != 0) { 113 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 114 IEEE80211_REASON_ASSOC_LEAVE); 115 ieee80211_node_leave(ni); 116 } 117 } 118 119 static void 120 sta_csa(void *arg, struct ieee80211_node *ni) 121 { 122 struct ieee80211vap *vap = arg; 123 124 if (ni->ni_vap == vap && ni->ni_associd != 0) 125 if (ni->ni_inact > vap->iv_inact_init) { 126 ni->ni_inact = vap->iv_inact_init; 127 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 128 "%s: inact %u", __func__, ni->ni_inact); 129 } 130 } 131 132 static void 133 sta_drop(void *arg, struct ieee80211_node *ni) 134 { 135 struct ieee80211vap *vap = arg; 136 137 if (ni->ni_vap == vap && ni->ni_associd != 0) 138 ieee80211_node_leave(ni); 139 } 140 141 /* 142 * Does a channel change require associated stations to re-associate 143 * so protocol state is correct. This is used when doing CSA across 144 * bands or similar (e.g. HT -> legacy). 145 */ 146 static int 147 isbandchange(struct ieee80211com *ic) 148 { 149 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 150 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 151 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 152 } 153 154 /* 155 * IEEE80211_M_HOSTAP vap state machine handler. 156 */ 157 static int 158 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 159 { 160 struct ieee80211com *ic = vap->iv_ic; 161 enum ieee80211_state ostate; 162 163 IEEE80211_LOCK_ASSERT(ic); 164 165 ostate = vap->iv_state; 166 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 167 __func__, ieee80211_state_name[ostate], 168 ieee80211_state_name[nstate], arg); 169 vap->iv_state = nstate; /* state transition */ 170 if (ostate != IEEE80211_S_SCAN) 171 ieee80211_cancel_scan(vap); /* background scan */ 172 switch (nstate) { 173 case IEEE80211_S_INIT: 174 switch (ostate) { 175 case IEEE80211_S_SCAN: 176 ieee80211_cancel_scan(vap); 177 break; 178 case IEEE80211_S_CAC: 179 ieee80211_dfs_cac_stop(vap); 180 break; 181 case IEEE80211_S_RUN: 182 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 183 break; 184 default: 185 break; 186 } 187 if (ostate != IEEE80211_S_INIT) { 188 /* NB: optimize INIT -> INIT case */ 189 ieee80211_reset_bss(vap); 190 } 191 if (vap->iv_auth->ia_detach != NULL) 192 vap->iv_auth->ia_detach(vap); 193 break; 194 case IEEE80211_S_SCAN: 195 switch (ostate) { 196 case IEEE80211_S_CSA: 197 case IEEE80211_S_RUN: 198 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 199 /* 200 * Clear overlapping BSS state; the beacon frame 201 * will be reconstructed on transition to the RUN 202 * state and the timeout routines check if the flag 203 * is set before doing anything so this is sufficient. 204 */ 205 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 206 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 207 /* fall thru... */ 208 case IEEE80211_S_CAC: 209 /* 210 * NB: We may get here because of a manual channel 211 * change in which case we need to stop CAC 212 * XXX no need to stop if ostate RUN but it's ok 213 */ 214 ieee80211_dfs_cac_stop(vap); 215 /* fall thru... */ 216 case IEEE80211_S_INIT: 217 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 218 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 219 /* 220 * Already have a channel; bypass the 221 * scan and startup immediately. 222 * ieee80211_create_ibss will call back to 223 * move us to RUN state. 224 */ 225 ieee80211_create_ibss(vap, vap->iv_des_chan); 226 break; 227 } 228 /* 229 * Initiate a scan. We can come here as a result 230 * of an IEEE80211_IOC_SCAN_REQ too in which case 231 * the vap will be marked with IEEE80211_FEXT_SCANREQ 232 * and the scan request parameters will be present 233 * in iv_scanreq. Otherwise we do the default. 234 */ 235 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 236 ieee80211_check_scan(vap, 237 vap->iv_scanreq_flags, 238 vap->iv_scanreq_duration, 239 vap->iv_scanreq_mindwell, 240 vap->iv_scanreq_maxdwell, 241 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 242 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 243 } else 244 ieee80211_check_scan_current(vap); 245 break; 246 case IEEE80211_S_SCAN: 247 /* 248 * A state change requires a reset; scan. 249 */ 250 ieee80211_check_scan_current(vap); 251 break; 252 default: 253 break; 254 } 255 break; 256 case IEEE80211_S_CAC: 257 /* 258 * Start CAC on a DFS channel. We come here when starting 259 * a bss on a DFS channel (see ieee80211_create_ibss). 260 */ 261 ieee80211_dfs_cac_start(vap); 262 break; 263 case IEEE80211_S_RUN: 264 if (vap->iv_flags & IEEE80211_F_WPA) { 265 /* XXX validate prerequisites */ 266 } 267 switch (ostate) { 268 case IEEE80211_S_INIT: 269 /* 270 * Already have a channel; bypass the 271 * scan and startup immediately. 272 * Note that ieee80211_create_ibss will call 273 * back to do a RUN->RUN state change. 274 */ 275 ieee80211_create_ibss(vap, 276 ieee80211_ht_adjust_channel(ic, 277 ic->ic_curchan, vap->iv_flags_ht)); 278 /* NB: iv_bss is changed on return */ 279 break; 280 case IEEE80211_S_CAC: 281 /* 282 * NB: This is the normal state change when CAC 283 * expires and no radar was detected; no need to 284 * clear the CAC timer as it's already expired. 285 */ 286 /* fall thru... */ 287 case IEEE80211_S_CSA: 288 /* 289 * Shorten inactivity timer of associated stations 290 * to weed out sta's that don't follow a CSA. 291 */ 292 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 293 /* 294 * Update bss node channel to reflect where 295 * we landed after CSA. 296 */ 297 ieee80211_node_set_chan(vap->iv_bss, 298 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 299 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 300 /* XXX bypass debug msgs */ 301 break; 302 case IEEE80211_S_SCAN: 303 case IEEE80211_S_RUN: 304 #ifdef IEEE80211_DEBUG 305 if (ieee80211_msg_debug(vap)) { 306 struct ieee80211_node *ni = vap->iv_bss; 307 ieee80211_note(vap, 308 "synchronized with %s ssid ", 309 ether_sprintf(ni->ni_bssid)); 310 ieee80211_print_essid(ni->ni_essid, 311 ni->ni_esslen); 312 /* XXX MCS/HT */ 313 printf(" channel %d start %uMb\n", 314 ieee80211_chan2ieee(ic, ic->ic_curchan), 315 IEEE80211_RATE2MBS(ni->ni_txrate)); 316 } 317 #endif 318 break; 319 default: 320 break; 321 } 322 /* 323 * Start/stop the authenticator. We delay until here 324 * to allow configuration to happen out of order. 325 */ 326 if (vap->iv_auth->ia_attach != NULL) { 327 /* XXX check failure */ 328 vap->iv_auth->ia_attach(vap); 329 } else if (vap->iv_auth->ia_detach != NULL) { 330 vap->iv_auth->ia_detach(vap); 331 } 332 ieee80211_node_authorize(vap->iv_bss); 333 break; 334 case IEEE80211_S_CSA: 335 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 336 /* 337 * On a ``band change'' silently drop associated 338 * stations as they must re-associate before they 339 * can pass traffic (as otherwise protocol state 340 * such as capabilities and the negotiated rate 341 * set may/will be wrong). 342 */ 343 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 344 } 345 break; 346 default: 347 break; 348 } 349 return 0; 350 } 351 352 static void 353 hostap_deliver_data(struct ieee80211vap *vap, 354 struct ieee80211_node *ni, struct mbuf *m) 355 { 356 struct ether_header *eh = mtod(m, struct ether_header *); 357 struct ifnet *ifp = vap->iv_ifp; 358 359 /* clear driver/net80211 flags before passing up */ 360 m->m_flags &= ~(M_MCAST | M_BCAST); 361 m_clrprotoflags(m); 362 363 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 364 ("gack, opmode %d", vap->iv_opmode)); 365 /* 366 * Do accounting. 367 */ 368 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 369 IEEE80211_NODE_STAT(ni, rx_data); 370 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 371 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 372 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 373 IEEE80211_NODE_STAT(ni, rx_mcast); 374 } else 375 IEEE80211_NODE_STAT(ni, rx_ucast); 376 377 /* perform as a bridge within the AP */ 378 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 379 struct mbuf *mcopy = NULL; 380 381 if (m->m_flags & M_MCAST) { 382 mcopy = m_dup(m, M_NOWAIT); 383 if (mcopy == NULL) 384 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 385 else 386 mcopy->m_flags |= M_MCAST; 387 } else { 388 /* 389 * Check if the destination is associated with the 390 * same vap and authorized to receive traffic. 391 * Beware of traffic destined for the vap itself; 392 * sending it will not work; just let it be delivered 393 * normally. 394 */ 395 struct ieee80211_node *sta = ieee80211_find_vap_node( 396 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 397 if (sta != NULL) { 398 if (ieee80211_node_is_authorized(sta)) { 399 /* 400 * Beware of sending to ourself; this 401 * needs to happen via the normal 402 * input path. 403 */ 404 if (sta != vap->iv_bss) { 405 mcopy = m; 406 m = NULL; 407 } 408 } else { 409 vap->iv_stats.is_rx_unauth++; 410 IEEE80211_NODE_STAT(sta, rx_unauth); 411 } 412 ieee80211_free_node(sta); 413 } 414 } 415 if (mcopy != NULL) { 416 int len, err; 417 len = mcopy->m_pkthdr.len; 418 err = ieee80211_vap_xmitpkt(vap, mcopy); 419 if (err) { 420 /* NB: IFQ_HANDOFF reclaims mcopy */ 421 } else { 422 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 423 } 424 } 425 } 426 if (m != NULL) { 427 /* 428 * Mark frame as coming from vap's interface. 429 */ 430 m->m_pkthdr.rcvif = ifp; 431 if (m->m_flags & M_MCAST) { 432 /* 433 * Spam DWDS vap's w/ multicast traffic. 434 */ 435 /* XXX only if dwds in use? */ 436 ieee80211_dwds_mcast(vap, m); 437 } 438 if (ni->ni_vlan != 0) { 439 /* attach vlan tag */ 440 m->m_pkthdr.ether_vtag = ni->ni_vlan; 441 m->m_flags |= M_VLANTAG; 442 } 443 ifp->if_input(ifp, m); 444 } 445 } 446 447 /* 448 * Decide if a received management frame should be 449 * printed when debugging is enabled. This filters some 450 * of the less interesting frames that come frequently 451 * (e.g. beacons). 452 */ 453 static __inline int 454 doprint(struct ieee80211vap *vap, int subtype) 455 { 456 switch (subtype) { 457 case IEEE80211_FC0_SUBTYPE_BEACON: 458 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 459 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 460 return 0; 461 } 462 return 1; 463 } 464 465 /* 466 * Process a received frame. The node associated with the sender 467 * should be supplied. If nothing was found in the node table then 468 * the caller is assumed to supply a reference to iv_bss instead. 469 * The RSSI and a timestamp are also supplied. The RSSI data is used 470 * during AP scanning to select a AP to associate with; it can have 471 * any units so long as values have consistent units and higher values 472 * mean ``better signal''. The receive timestamp is currently not used 473 * by the 802.11 layer. 474 */ 475 static int 476 hostap_input(struct ieee80211_node *ni, struct mbuf *m, 477 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 478 { 479 struct ieee80211vap *vap = ni->ni_vap; 480 struct ieee80211com *ic = ni->ni_ic; 481 struct ifnet *ifp = vap->iv_ifp; 482 struct ieee80211_frame *wh; 483 struct ieee80211_key *key; 484 struct ether_header *eh; 485 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 486 uint8_t dir, type, subtype, qos; 487 uint8_t *bssid; 488 uint16_t rxseq; 489 490 if (m->m_flags & M_AMPDU_MPDU) { 491 /* 492 * Fastpath for A-MPDU reorder q resubmission. Frames 493 * w/ M_AMPDU_MPDU marked have already passed through 494 * here but were received out of order and been held on 495 * the reorder queue. When resubmitted they are marked 496 * with the M_AMPDU_MPDU flag and we can bypass most of 497 * the normal processing. 498 */ 499 wh = mtod(m, struct ieee80211_frame *); 500 type = IEEE80211_FC0_TYPE_DATA; 501 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 502 subtype = IEEE80211_FC0_SUBTYPE_QOS; 503 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 504 goto resubmit_ampdu; 505 } 506 507 KASSERT(ni != NULL, ("null node")); 508 ni->ni_inact = ni->ni_inact_reload; 509 510 type = -1; /* undefined */ 511 512 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 513 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 514 ni->ni_macaddr, NULL, 515 "too short (1): len %u", m->m_pkthdr.len); 516 vap->iv_stats.is_rx_tooshort++; 517 goto out; 518 } 519 /* 520 * Bit of a cheat here, we use a pointer for a 3-address 521 * frame format but don't reference fields past outside 522 * ieee80211_frame_min w/o first validating the data is 523 * present. 524 */ 525 wh = mtod(m, struct ieee80211_frame *); 526 527 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 528 IEEE80211_FC0_VERSION_0) { 529 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 530 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 531 wh->i_fc[0], wh->i_fc[1]); 532 vap->iv_stats.is_rx_badversion++; 533 goto err; 534 } 535 536 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 537 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 538 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 539 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 540 if (dir != IEEE80211_FC1_DIR_NODS) 541 bssid = wh->i_addr1; 542 else if (type == IEEE80211_FC0_TYPE_CTL) 543 bssid = wh->i_addr1; 544 else { 545 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 546 IEEE80211_DISCARD_MAC(vap, 547 IEEE80211_MSG_ANY, ni->ni_macaddr, 548 NULL, "too short (2): len %u", 549 m->m_pkthdr.len); 550 vap->iv_stats.is_rx_tooshort++; 551 goto out; 552 } 553 bssid = wh->i_addr3; 554 } 555 /* 556 * Validate the bssid. 557 */ 558 if (!(type == IEEE80211_FC0_TYPE_MGT && 559 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 560 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 561 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 562 /* not interested in */ 563 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 564 bssid, NULL, "%s", "not to bss"); 565 vap->iv_stats.is_rx_wrongbss++; 566 goto out; 567 } 568 569 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 570 ni->ni_noise = nf; 571 if (IEEE80211_HAS_SEQ(type, subtype)) { 572 uint8_t tid = ieee80211_gettid(wh); 573 if (IEEE80211_QOS_HAS_SEQ(wh) && 574 TID_TO_WME_AC(tid) >= WME_AC_VI) 575 ic->ic_wme.wme_hipri_traffic++; 576 rxseq = le16toh(*(uint16_t *)wh->i_seq); 577 if (! ieee80211_check_rxseq(ni, wh)) { 578 /* duplicate, discard */ 579 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 580 bssid, "duplicate", 581 "seqno <%u,%u> fragno <%u,%u> tid %u", 582 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 583 ni->ni_rxseqs[tid] >> 584 IEEE80211_SEQ_SEQ_SHIFT, 585 rxseq & IEEE80211_SEQ_FRAG_MASK, 586 ni->ni_rxseqs[tid] & 587 IEEE80211_SEQ_FRAG_MASK, 588 tid); 589 vap->iv_stats.is_rx_dup++; 590 IEEE80211_NODE_STAT(ni, rx_dup); 591 goto out; 592 } 593 ni->ni_rxseqs[tid] = rxseq; 594 } 595 } 596 597 switch (type) { 598 case IEEE80211_FC0_TYPE_DATA: 599 hdrspace = ieee80211_hdrspace(ic, wh); 600 if (m->m_len < hdrspace && 601 (m = m_pullup(m, hdrspace)) == NULL) { 602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 603 ni->ni_macaddr, NULL, 604 "data too short: expecting %u", hdrspace); 605 vap->iv_stats.is_rx_tooshort++; 606 goto out; /* XXX */ 607 } 608 if (!(dir == IEEE80211_FC1_DIR_TODS || 609 (dir == IEEE80211_FC1_DIR_DSTODS && 610 (vap->iv_flags & IEEE80211_F_DWDS)))) { 611 if (dir != IEEE80211_FC1_DIR_DSTODS) { 612 IEEE80211_DISCARD(vap, 613 IEEE80211_MSG_INPUT, wh, "data", 614 "incorrect dir 0x%x", dir); 615 } else { 616 IEEE80211_DISCARD(vap, 617 IEEE80211_MSG_INPUT | 618 IEEE80211_MSG_WDS, wh, 619 "4-address data", 620 "%s", "DWDS not enabled"); 621 } 622 vap->iv_stats.is_rx_wrongdir++; 623 goto out; 624 } 625 /* check if source STA is associated */ 626 if (ni == vap->iv_bss) { 627 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 628 wh, "data", "%s", "unknown src"); 629 ieee80211_send_error(ni, wh->i_addr2, 630 IEEE80211_FC0_SUBTYPE_DEAUTH, 631 IEEE80211_REASON_NOT_AUTHED); 632 vap->iv_stats.is_rx_notassoc++; 633 goto err; 634 } 635 if (ni->ni_associd == 0) { 636 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 637 wh, "data", "%s", "unassoc src"); 638 IEEE80211_SEND_MGMT(ni, 639 IEEE80211_FC0_SUBTYPE_DISASSOC, 640 IEEE80211_REASON_NOT_ASSOCED); 641 vap->iv_stats.is_rx_notassoc++; 642 goto err; 643 } 644 645 /* 646 * Check for power save state change. 647 * XXX out-of-order A-MPDU frames? 648 */ 649 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 650 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 651 vap->iv_node_ps(ni, 652 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 653 /* 654 * For 4-address packets handle WDS discovery 655 * notifications. Once a WDS link is setup frames 656 * are just delivered to the WDS vap (see below). 657 */ 658 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 659 if (!ieee80211_node_is_authorized(ni)) { 660 IEEE80211_DISCARD(vap, 661 IEEE80211_MSG_INPUT | 662 IEEE80211_MSG_WDS, wh, 663 "4-address data", 664 "%s", "unauthorized port"); 665 vap->iv_stats.is_rx_unauth++; 666 IEEE80211_NODE_STAT(ni, rx_unauth); 667 goto err; 668 } 669 ieee80211_dwds_discover(ni, m); 670 return type; 671 } 672 673 /* 674 * Handle A-MPDU re-ordering. If the frame is to be 675 * processed directly then ieee80211_ampdu_reorder 676 * will return 0; otherwise it has consumed the mbuf 677 * and we should do nothing more with it. 678 */ 679 if ((m->m_flags & M_AMPDU) && 680 ieee80211_ampdu_reorder(ni, m) != 0) { 681 m = NULL; 682 goto out; 683 } 684 resubmit_ampdu: 685 686 /* 687 * Handle privacy requirements. Note that we 688 * must not be preempted from here until after 689 * we (potentially) call ieee80211_crypto_demic; 690 * otherwise we may violate assumptions in the 691 * crypto cipher modules used to do delayed update 692 * of replay sequence numbers. 693 */ 694 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 695 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 696 /* 697 * Discard encrypted frames when privacy is off. 698 */ 699 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 700 wh, "WEP", "%s", "PRIVACY off"); 701 vap->iv_stats.is_rx_noprivacy++; 702 IEEE80211_NODE_STAT(ni, rx_noprivacy); 703 goto out; 704 } 705 key = ieee80211_crypto_decap(ni, m, hdrspace); 706 if (key == NULL) { 707 /* NB: stats+msgs handled in crypto_decap */ 708 IEEE80211_NODE_STAT(ni, rx_wepfail); 709 goto out; 710 } 711 wh = mtod(m, struct ieee80211_frame *); 712 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 713 } else { 714 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 715 key = NULL; 716 } 717 718 /* 719 * Save QoS bits for use below--before we strip the header. 720 */ 721 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 722 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 723 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 724 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 725 } else 726 qos = 0; 727 728 /* 729 * Next up, any fragmentation. 730 */ 731 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 732 m = ieee80211_defrag(ni, m, hdrspace); 733 if (m == NULL) { 734 /* Fragment dropped or frame not complete yet */ 735 goto out; 736 } 737 } 738 wh = NULL; /* no longer valid, catch any uses */ 739 740 /* 741 * Next strip any MSDU crypto bits. 742 */ 743 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 744 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 745 ni->ni_macaddr, "data", "%s", "demic error"); 746 vap->iv_stats.is_rx_demicfail++; 747 IEEE80211_NODE_STAT(ni, rx_demicfail); 748 goto out; 749 } 750 /* copy to listener after decrypt */ 751 if (ieee80211_radiotap_active_vap(vap)) 752 ieee80211_radiotap_rx(vap, m); 753 need_tap = 0; 754 /* 755 * Finally, strip the 802.11 header. 756 */ 757 m = ieee80211_decap(vap, m, hdrspace); 758 if (m == NULL) { 759 /* XXX mask bit to check for both */ 760 /* don't count Null data frames as errors */ 761 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 762 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 763 goto out; 764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 765 ni->ni_macaddr, "data", "%s", "decap error"); 766 vap->iv_stats.is_rx_decap++; 767 IEEE80211_NODE_STAT(ni, rx_decap); 768 goto err; 769 } 770 eh = mtod(m, struct ether_header *); 771 if (!ieee80211_node_is_authorized(ni)) { 772 /* 773 * Deny any non-PAE frames received prior to 774 * authorization. For open/shared-key 775 * authentication the port is mark authorized 776 * after authentication completes. For 802.1x 777 * the port is not marked authorized by the 778 * authenticator until the handshake has completed. 779 */ 780 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 781 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 782 eh->ether_shost, "data", 783 "unauthorized port: ether type 0x%x len %u", 784 eh->ether_type, m->m_pkthdr.len); 785 vap->iv_stats.is_rx_unauth++; 786 IEEE80211_NODE_STAT(ni, rx_unauth); 787 goto err; 788 } 789 } else { 790 /* 791 * When denying unencrypted frames, discard 792 * any non-PAE frames received without encryption. 793 */ 794 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 795 (key == NULL && (m->m_flags & M_WEP) == 0) && 796 eh->ether_type != htons(ETHERTYPE_PAE)) { 797 /* 798 * Drop unencrypted frames. 799 */ 800 vap->iv_stats.is_rx_unencrypted++; 801 IEEE80211_NODE_STAT(ni, rx_unencrypted); 802 goto out; 803 } 804 } 805 /* XXX require HT? */ 806 if (qos & IEEE80211_QOS_AMSDU) { 807 m = ieee80211_decap_amsdu(ni, m); 808 if (m == NULL) 809 return IEEE80211_FC0_TYPE_DATA; 810 } else { 811 #ifdef IEEE80211_SUPPORT_SUPERG 812 m = ieee80211_decap_fastframe(vap, ni, m); 813 if (m == NULL) 814 return IEEE80211_FC0_TYPE_DATA; 815 #endif 816 } 817 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 818 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 819 else 820 hostap_deliver_data(vap, ni, m); 821 return IEEE80211_FC0_TYPE_DATA; 822 823 case IEEE80211_FC0_TYPE_MGT: 824 vap->iv_stats.is_rx_mgmt++; 825 IEEE80211_NODE_STAT(ni, rx_mgmt); 826 if (dir != IEEE80211_FC1_DIR_NODS) { 827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 828 wh, "mgt", "incorrect dir 0x%x", dir); 829 vap->iv_stats.is_rx_wrongdir++; 830 goto err; 831 } 832 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 833 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 834 ni->ni_macaddr, "mgt", "too short: len %u", 835 m->m_pkthdr.len); 836 vap->iv_stats.is_rx_tooshort++; 837 goto out; 838 } 839 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 840 /* ensure return frames are unicast */ 841 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 842 wh, NULL, "source is multicast: %s", 843 ether_sprintf(wh->i_addr2)); 844 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 845 goto out; 846 } 847 #ifdef IEEE80211_DEBUG 848 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 849 ieee80211_msg_dumppkts(vap)) { 850 if_printf(ifp, "received %s from %s rssi %d\n", 851 ieee80211_mgt_subtype_name[subtype >> 852 IEEE80211_FC0_SUBTYPE_SHIFT], 853 ether_sprintf(wh->i_addr2), rssi); 854 } 855 #endif 856 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 858 /* 859 * Only shared key auth frames with a challenge 860 * should be encrypted, discard all others. 861 */ 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, NULL, 864 "%s", "WEP set but not permitted"); 865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 866 goto out; 867 } 868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 869 /* 870 * Discard encrypted frames when privacy is off. 871 */ 872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 873 wh, NULL, "%s", "WEP set but PRIVACY off"); 874 vap->iv_stats.is_rx_noprivacy++; 875 goto out; 876 } 877 hdrspace = ieee80211_hdrspace(ic, wh); 878 key = ieee80211_crypto_decap(ni, m, hdrspace); 879 if (key == NULL) { 880 /* NB: stats+msgs handled in crypto_decap */ 881 goto out; 882 } 883 wh = mtod(m, struct ieee80211_frame *); 884 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 885 } 886 /* 887 * Pass the packet to radiotap before calling iv_recv_mgmt(). 888 * Otherwise iv_recv_mgmt() might pass another packet to 889 * radiotap, resulting in out of order packet captures. 890 */ 891 if (ieee80211_radiotap_active_vap(vap)) 892 ieee80211_radiotap_rx(vap, m); 893 need_tap = 0; 894 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 895 goto out; 896 897 case IEEE80211_FC0_TYPE_CTL: 898 vap->iv_stats.is_rx_ctl++; 899 IEEE80211_NODE_STAT(ni, rx_ctrl); 900 vap->iv_recv_ctl(ni, m, subtype); 901 goto out; 902 default: 903 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 904 wh, "bad", "frame type 0x%x", type); 905 /* should not come here */ 906 break; 907 } 908 err: 909 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 910 out: 911 if (m != NULL) { 912 if (need_tap && ieee80211_radiotap_active_vap(vap)) 913 ieee80211_radiotap_rx(vap, m); 914 m_freem(m); 915 } 916 return type; 917 } 918 919 static void 920 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 921 int rssi, int nf, uint16_t seq, uint16_t status) 922 { 923 struct ieee80211vap *vap = ni->ni_vap; 924 925 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 926 927 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 928 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 929 ni->ni_macaddr, "open auth", 930 "bad sta auth mode %u", ni->ni_authmode); 931 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 932 /* 933 * Clear any challenge text that may be there if 934 * a previous shared key auth failed and then an 935 * open auth is attempted. 936 */ 937 if (ni->ni_challenge != NULL) { 938 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 939 ni->ni_challenge = NULL; 940 } 941 /* XXX hack to workaround calling convention */ 942 ieee80211_send_error(ni, wh->i_addr2, 943 IEEE80211_FC0_SUBTYPE_AUTH, 944 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 945 return; 946 } 947 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 948 vap->iv_stats.is_rx_bad_auth++; 949 return; 950 } 951 /* always accept open authentication requests */ 952 if (ni == vap->iv_bss) { 953 ni = ieee80211_dup_bss(vap, wh->i_addr2); 954 if (ni == NULL) 955 return; 956 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 957 (void) ieee80211_ref_node(ni); 958 /* 959 * Mark the node as referenced to reflect that it's 960 * reference count has been bumped to insure it remains 961 * after the transaction completes. 962 */ 963 ni->ni_flags |= IEEE80211_NODE_AREF; 964 /* 965 * Mark the node as requiring a valid association id 966 * before outbound traffic is permitted. 967 */ 968 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 969 970 if (vap->iv_acl != NULL && 971 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 972 /* 973 * When the ACL policy is set to RADIUS we defer the 974 * authorization to a user agent. Dispatch an event, 975 * a subsequent MLME call will decide the fate of the 976 * station. If the user agent is not present then the 977 * node will be reclaimed due to inactivity. 978 */ 979 IEEE80211_NOTE_MAC(vap, 980 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 981 "%s", "station authentication defered (radius acl)"); 982 ieee80211_notify_node_auth(ni); 983 } else { 984 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 985 IEEE80211_NOTE_MAC(vap, 986 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 987 "%s", "station authenticated (open)"); 988 /* 989 * When 802.1x is not in use mark the port 990 * authorized at this point so traffic can flow. 991 */ 992 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 993 ieee80211_node_authorize(ni); 994 } 995 } 996 997 static void 998 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 999 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1000 uint16_t seq, uint16_t status) 1001 { 1002 struct ieee80211vap *vap = ni->ni_vap; 1003 uint8_t *challenge; 1004 int allocbs, estatus; 1005 1006 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1007 1008 /* 1009 * NB: this can happen as we allow pre-shared key 1010 * authentication to be enabled w/o wep being turned 1011 * on so that configuration of these can be done 1012 * in any order. It may be better to enforce the 1013 * ordering in which case this check would just be 1014 * for sanity/consistency. 1015 */ 1016 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1017 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1018 ni->ni_macaddr, "shared key auth", 1019 "%s", " PRIVACY is disabled"); 1020 estatus = IEEE80211_STATUS_ALG; 1021 goto bad; 1022 } 1023 /* 1024 * Pre-shared key authentication is evil; accept 1025 * it only if explicitly configured (it is supported 1026 * mainly for compatibility with clients like Mac OS X). 1027 */ 1028 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1029 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1030 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1031 ni->ni_macaddr, "shared key auth", 1032 "bad sta auth mode %u", ni->ni_authmode); 1033 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1034 estatus = IEEE80211_STATUS_ALG; 1035 goto bad; 1036 } 1037 1038 challenge = NULL; 1039 if (frm + 1 < efrm) { 1040 if ((frm[1] + 2) > (efrm - frm)) { 1041 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1042 ni->ni_macaddr, "shared key auth", 1043 "ie %d/%d too long", 1044 frm[0], (frm[1] + 2) - (efrm - frm)); 1045 vap->iv_stats.is_rx_bad_auth++; 1046 estatus = IEEE80211_STATUS_CHALLENGE; 1047 goto bad; 1048 } 1049 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1050 challenge = frm; 1051 frm += frm[1] + 2; 1052 } 1053 switch (seq) { 1054 case IEEE80211_AUTH_SHARED_CHALLENGE: 1055 case IEEE80211_AUTH_SHARED_RESPONSE: 1056 if (challenge == NULL) { 1057 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1058 ni->ni_macaddr, "shared key auth", 1059 "%s", "no challenge"); 1060 vap->iv_stats.is_rx_bad_auth++; 1061 estatus = IEEE80211_STATUS_CHALLENGE; 1062 goto bad; 1063 } 1064 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1065 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1066 ni->ni_macaddr, "shared key auth", 1067 "bad challenge len %d", challenge[1]); 1068 vap->iv_stats.is_rx_bad_auth++; 1069 estatus = IEEE80211_STATUS_CHALLENGE; 1070 goto bad; 1071 } 1072 default: 1073 break; 1074 } 1075 switch (seq) { 1076 case IEEE80211_AUTH_SHARED_REQUEST: 1077 if (ni == vap->iv_bss) { 1078 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1079 if (ni == NULL) { 1080 /* NB: no way to return an error */ 1081 return; 1082 } 1083 allocbs = 1; 1084 } else { 1085 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1086 (void) ieee80211_ref_node(ni); 1087 allocbs = 0; 1088 } 1089 /* 1090 * Mark the node as referenced to reflect that it's 1091 * reference count has been bumped to insure it remains 1092 * after the transaction completes. 1093 */ 1094 ni->ni_flags |= IEEE80211_NODE_AREF; 1095 /* 1096 * Mark the node as requiring a valid associatio id 1097 * before outbound traffic is permitted. 1098 */ 1099 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1100 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1101 ni->ni_noise = nf; 1102 if (!ieee80211_alloc_challenge(ni)) { 1103 /* NB: don't return error so they rexmit */ 1104 return; 1105 } 1106 get_random_bytes(ni->ni_challenge, 1107 IEEE80211_CHALLENGE_LEN); 1108 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1109 ni, "shared key %sauth request", allocbs ? "" : "re"); 1110 /* 1111 * When the ACL policy is set to RADIUS we defer the 1112 * authorization to a user agent. Dispatch an event, 1113 * a subsequent MLME call will decide the fate of the 1114 * station. If the user agent is not present then the 1115 * node will be reclaimed due to inactivity. 1116 */ 1117 if (vap->iv_acl != NULL && 1118 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1119 IEEE80211_NOTE_MAC(vap, 1120 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1121 ni->ni_macaddr, 1122 "%s", "station authentication defered (radius acl)"); 1123 ieee80211_notify_node_auth(ni); 1124 return; 1125 } 1126 break; 1127 case IEEE80211_AUTH_SHARED_RESPONSE: 1128 if (ni == vap->iv_bss) { 1129 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1130 ni->ni_macaddr, "shared key response", 1131 "%s", "unknown station"); 1132 /* NB: don't send a response */ 1133 return; 1134 } 1135 if (ni->ni_challenge == NULL) { 1136 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1137 ni->ni_macaddr, "shared key response", 1138 "%s", "no challenge recorded"); 1139 vap->iv_stats.is_rx_bad_auth++; 1140 estatus = IEEE80211_STATUS_CHALLENGE; 1141 goto bad; 1142 } 1143 if (memcmp(ni->ni_challenge, &challenge[2], 1144 challenge[1]) != 0) { 1145 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1146 ni->ni_macaddr, "shared key response", 1147 "%s", "challenge mismatch"); 1148 vap->iv_stats.is_rx_auth_fail++; 1149 estatus = IEEE80211_STATUS_CHALLENGE; 1150 goto bad; 1151 } 1152 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1153 ni, "%s", "station authenticated (shared key)"); 1154 ieee80211_node_authorize(ni); 1155 break; 1156 default: 1157 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1158 ni->ni_macaddr, "shared key auth", 1159 "bad seq %d", seq); 1160 vap->iv_stats.is_rx_bad_auth++; 1161 estatus = IEEE80211_STATUS_SEQUENCE; 1162 goto bad; 1163 } 1164 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1165 return; 1166 bad: 1167 /* 1168 * Send an error response; but only when operating as an AP. 1169 */ 1170 /* XXX hack to workaround calling convention */ 1171 ieee80211_send_error(ni, wh->i_addr2, 1172 IEEE80211_FC0_SUBTYPE_AUTH, 1173 (seq + 1) | (estatus<<16)); 1174 } 1175 1176 /* 1177 * Convert a WPA cipher selector OUI to an internal 1178 * cipher algorithm. Where appropriate we also 1179 * record any key length. 1180 */ 1181 static int 1182 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1183 { 1184 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1185 uint32_t w = LE_READ_4(sel); 1186 1187 switch (w) { 1188 case WPA_SEL(WPA_CSE_NULL): 1189 return IEEE80211_CIPHER_NONE; 1190 case WPA_SEL(WPA_CSE_WEP40): 1191 if (keylen) 1192 *keylen = 40 / NBBY; 1193 return IEEE80211_CIPHER_WEP; 1194 case WPA_SEL(WPA_CSE_WEP104): 1195 if (keylen) 1196 *keylen = 104 / NBBY; 1197 return IEEE80211_CIPHER_WEP; 1198 case WPA_SEL(WPA_CSE_TKIP): 1199 return IEEE80211_CIPHER_TKIP; 1200 case WPA_SEL(WPA_CSE_CCMP): 1201 return IEEE80211_CIPHER_AES_CCM; 1202 } 1203 return 32; /* NB: so 1<< is discarded */ 1204 #undef WPA_SEL 1205 } 1206 1207 /* 1208 * Convert a WPA key management/authentication algorithm 1209 * to an internal code. 1210 */ 1211 static int 1212 wpa_keymgmt(const uint8_t *sel) 1213 { 1214 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1215 uint32_t w = LE_READ_4(sel); 1216 1217 switch (w) { 1218 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1219 return WPA_ASE_8021X_UNSPEC; 1220 case WPA_SEL(WPA_ASE_8021X_PSK): 1221 return WPA_ASE_8021X_PSK; 1222 case WPA_SEL(WPA_ASE_NONE): 1223 return WPA_ASE_NONE; 1224 } 1225 return 0; /* NB: so is discarded */ 1226 #undef WPA_SEL 1227 } 1228 1229 /* 1230 * Parse a WPA information element to collect parameters. 1231 * Note that we do not validate security parameters; that 1232 * is handled by the authenticator; the parsing done here 1233 * is just for internal use in making operational decisions. 1234 */ 1235 static int 1236 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1237 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1238 { 1239 uint8_t len = frm[1]; 1240 uint32_t w; 1241 int n; 1242 1243 /* 1244 * Check the length once for fixed parts: OUI, type, 1245 * version, mcast cipher, and 2 selector counts. 1246 * Other, variable-length data, must be checked separately. 1247 */ 1248 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1249 IEEE80211_DISCARD_IE(vap, 1250 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1251 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1252 return IEEE80211_REASON_IE_INVALID; 1253 } 1254 if (len < 14) { 1255 IEEE80211_DISCARD_IE(vap, 1256 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1257 wh, "WPA", "too short, len %u", len); 1258 return IEEE80211_REASON_IE_INVALID; 1259 } 1260 frm += 6, len -= 4; /* NB: len is payload only */ 1261 /* NB: iswpaoui already validated the OUI and type */ 1262 w = LE_READ_2(frm); 1263 if (w != WPA_VERSION) { 1264 IEEE80211_DISCARD_IE(vap, 1265 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1266 wh, "WPA", "bad version %u", w); 1267 return IEEE80211_REASON_IE_INVALID; 1268 } 1269 frm += 2, len -= 2; 1270 1271 memset(rsn, 0, sizeof(*rsn)); 1272 1273 /* multicast/group cipher */ 1274 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1275 frm += 4, len -= 4; 1276 1277 /* unicast ciphers */ 1278 n = LE_READ_2(frm); 1279 frm += 2, len -= 2; 1280 if (len < n*4+2) { 1281 IEEE80211_DISCARD_IE(vap, 1282 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1283 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1284 len, n); 1285 return IEEE80211_REASON_IE_INVALID; 1286 } 1287 w = 0; 1288 for (; n > 0; n--) { 1289 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1290 frm += 4, len -= 4; 1291 } 1292 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1293 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1294 else 1295 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1296 1297 /* key management algorithms */ 1298 n = LE_READ_2(frm); 1299 frm += 2, len -= 2; 1300 if (len < n*4) { 1301 IEEE80211_DISCARD_IE(vap, 1302 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1303 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1304 len, n); 1305 return IEEE80211_REASON_IE_INVALID; 1306 } 1307 w = 0; 1308 for (; n > 0; n--) { 1309 w |= wpa_keymgmt(frm); 1310 frm += 4, len -= 4; 1311 } 1312 if (w & WPA_ASE_8021X_UNSPEC) 1313 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1314 else 1315 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1316 1317 if (len > 2) /* optional capabilities */ 1318 rsn->rsn_caps = LE_READ_2(frm); 1319 1320 return 0; 1321 } 1322 1323 /* 1324 * Convert an RSN cipher selector OUI to an internal 1325 * cipher algorithm. Where appropriate we also 1326 * record any key length. 1327 */ 1328 static int 1329 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1330 { 1331 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1332 uint32_t w = LE_READ_4(sel); 1333 1334 switch (w) { 1335 case RSN_SEL(RSN_CSE_NULL): 1336 return IEEE80211_CIPHER_NONE; 1337 case RSN_SEL(RSN_CSE_WEP40): 1338 if (keylen) 1339 *keylen = 40 / NBBY; 1340 return IEEE80211_CIPHER_WEP; 1341 case RSN_SEL(RSN_CSE_WEP104): 1342 if (keylen) 1343 *keylen = 104 / NBBY; 1344 return IEEE80211_CIPHER_WEP; 1345 case RSN_SEL(RSN_CSE_TKIP): 1346 return IEEE80211_CIPHER_TKIP; 1347 case RSN_SEL(RSN_CSE_CCMP): 1348 return IEEE80211_CIPHER_AES_CCM; 1349 case RSN_SEL(RSN_CSE_WRAP): 1350 return IEEE80211_CIPHER_AES_OCB; 1351 } 1352 return 32; /* NB: so 1<< is discarded */ 1353 #undef WPA_SEL 1354 } 1355 1356 /* 1357 * Convert an RSN key management/authentication algorithm 1358 * to an internal code. 1359 */ 1360 static int 1361 rsn_keymgmt(const uint8_t *sel) 1362 { 1363 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1364 uint32_t w = LE_READ_4(sel); 1365 1366 switch (w) { 1367 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1368 return RSN_ASE_8021X_UNSPEC; 1369 case RSN_SEL(RSN_ASE_8021X_PSK): 1370 return RSN_ASE_8021X_PSK; 1371 case RSN_SEL(RSN_ASE_NONE): 1372 return RSN_ASE_NONE; 1373 } 1374 return 0; /* NB: so is discarded */ 1375 #undef RSN_SEL 1376 } 1377 1378 /* 1379 * Parse a WPA/RSN information element to collect parameters 1380 * and validate the parameters against what has been 1381 * configured for the system. 1382 */ 1383 static int 1384 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1385 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1386 { 1387 uint8_t len = frm[1]; 1388 uint32_t w; 1389 int n; 1390 1391 /* 1392 * Check the length once for fixed parts: 1393 * version, mcast cipher, and 2 selector counts. 1394 * Other, variable-length data, must be checked separately. 1395 */ 1396 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1397 IEEE80211_DISCARD_IE(vap, 1398 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1399 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1400 return IEEE80211_REASON_IE_INVALID; 1401 } 1402 if (len < 10) { 1403 IEEE80211_DISCARD_IE(vap, 1404 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1405 wh, "RSN", "too short, len %u", len); 1406 return IEEE80211_REASON_IE_INVALID; 1407 } 1408 frm += 2; 1409 w = LE_READ_2(frm); 1410 if (w != RSN_VERSION) { 1411 IEEE80211_DISCARD_IE(vap, 1412 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1413 wh, "RSN", "bad version %u", w); 1414 return IEEE80211_REASON_IE_INVALID; 1415 } 1416 frm += 2, len -= 2; 1417 1418 memset(rsn, 0, sizeof(*rsn)); 1419 1420 /* multicast/group cipher */ 1421 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1422 frm += 4, len -= 4; 1423 1424 /* unicast ciphers */ 1425 n = LE_READ_2(frm); 1426 frm += 2, len -= 2; 1427 if (len < n*4+2) { 1428 IEEE80211_DISCARD_IE(vap, 1429 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1430 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1431 len, n); 1432 return IEEE80211_REASON_IE_INVALID; 1433 } 1434 w = 0; 1435 for (; n > 0; n--) { 1436 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1437 frm += 4, len -= 4; 1438 } 1439 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1440 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1441 else 1442 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1443 1444 /* key management algorithms */ 1445 n = LE_READ_2(frm); 1446 frm += 2, len -= 2; 1447 if (len < n*4) { 1448 IEEE80211_DISCARD_IE(vap, 1449 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1450 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1451 len, n); 1452 return IEEE80211_REASON_IE_INVALID; 1453 } 1454 w = 0; 1455 for (; n > 0; n--) { 1456 w |= rsn_keymgmt(frm); 1457 frm += 4, len -= 4; 1458 } 1459 if (w & RSN_ASE_8021X_UNSPEC) 1460 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1461 else 1462 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1463 1464 /* optional RSN capabilities */ 1465 if (len > 2) 1466 rsn->rsn_caps = LE_READ_2(frm); 1467 /* XXXPMKID */ 1468 1469 return 0; 1470 } 1471 1472 /* 1473 * WPA/802.11i assocation request processing. 1474 */ 1475 static int 1476 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1477 const struct ieee80211_frame *wh, const uint8_t *wpa, 1478 const uint8_t *rsn, uint16_t capinfo) 1479 { 1480 struct ieee80211vap *vap = ni->ni_vap; 1481 uint8_t reason; 1482 int badwparsn; 1483 1484 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1485 if (wpa == NULL && rsn == NULL) { 1486 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1487 /* 1488 * W-Fi Protected Setup (WPS) permits 1489 * clients to associate and pass EAPOL frames 1490 * to establish initial credentials. 1491 */ 1492 ni->ni_flags |= IEEE80211_NODE_WPS; 1493 return 1; 1494 } 1495 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1496 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1497 /* 1498 * Transitional Security Network. Permits clients 1499 * to associate and use WEP while WPA is configured. 1500 */ 1501 ni->ni_flags |= IEEE80211_NODE_TSN; 1502 return 1; 1503 } 1504 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1505 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1506 vap->iv_stats.is_rx_assoc_badwpaie++; 1507 reason = IEEE80211_REASON_IE_INVALID; 1508 goto bad; 1509 } 1510 /* assert right association security credentials */ 1511 badwparsn = 0; /* NB: to silence compiler */ 1512 switch (vap->iv_flags & IEEE80211_F_WPA) { 1513 case IEEE80211_F_WPA1: 1514 badwparsn = (wpa == NULL); 1515 break; 1516 case IEEE80211_F_WPA2: 1517 badwparsn = (rsn == NULL); 1518 break; 1519 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1520 badwparsn = (wpa == NULL && rsn == NULL); 1521 break; 1522 } 1523 if (badwparsn) { 1524 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1525 wh, NULL, 1526 "%s", "missing WPA/RSN IE in association request"); 1527 vap->iv_stats.is_rx_assoc_badwpaie++; 1528 reason = IEEE80211_REASON_IE_INVALID; 1529 goto bad; 1530 } 1531 /* 1532 * Parse WPA/RSN information element. 1533 */ 1534 if (wpa != NULL) 1535 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1536 else 1537 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1538 if (reason != 0) { 1539 /* XXX distinguish WPA/RSN? */ 1540 vap->iv_stats.is_rx_assoc_badwpaie++; 1541 goto bad; 1542 } 1543 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1544 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1545 wpa != NULL ? "WPA" : "RSN", 1546 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1547 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1548 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1549 1550 return 1; 1551 bad: 1552 ieee80211_node_deauth(ni, reason); 1553 return 0; 1554 } 1555 1556 /* XXX find a better place for definition */ 1557 struct l2_update_frame { 1558 struct ether_header eh; 1559 uint8_t dsap; 1560 uint8_t ssap; 1561 uint8_t control; 1562 uint8_t xid[3]; 1563 } __packed; 1564 1565 /* 1566 * Deliver a TGf L2UF frame on behalf of a station. 1567 * This primes any bridge when the station is roaming 1568 * between ap's on the same wired network. 1569 */ 1570 static void 1571 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1572 { 1573 struct ieee80211vap *vap = ni->ni_vap; 1574 struct ifnet *ifp = vap->iv_ifp; 1575 struct mbuf *m; 1576 struct l2_update_frame *l2uf; 1577 struct ether_header *eh; 1578 1579 m = m_gethdr(M_NOWAIT, MT_DATA); 1580 if (m == NULL) { 1581 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1582 "%s", "no mbuf for l2uf frame"); 1583 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1584 return; 1585 } 1586 l2uf = mtod(m, struct l2_update_frame *); 1587 eh = &l2uf->eh; 1588 /* dst: Broadcast address */ 1589 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1590 /* src: associated STA */ 1591 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1592 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1593 1594 l2uf->dsap = 0; 1595 l2uf->ssap = 0; 1596 l2uf->control = 0xf5; 1597 l2uf->xid[0] = 0x81; 1598 l2uf->xid[1] = 0x80; 1599 l2uf->xid[2] = 0x00; 1600 1601 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1602 hostap_deliver_data(vap, ni, m); 1603 } 1604 1605 static void 1606 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1607 int reassoc, int resp, const char *tag, int rate) 1608 { 1609 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1610 "deny %s request, %s rate set mismatch, rate/MCS %d", 1611 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1612 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1613 ieee80211_node_leave(ni); 1614 } 1615 1616 static void 1617 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1618 int reassoc, int resp, const char *tag, int capinfo) 1619 { 1620 struct ieee80211vap *vap = ni->ni_vap; 1621 1622 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1623 "deny %s request, %s mismatch 0x%x", 1624 reassoc ? "reassoc" : "assoc", tag, capinfo); 1625 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1626 ieee80211_node_leave(ni); 1627 vap->iv_stats.is_rx_assoc_capmismatch++; 1628 } 1629 1630 static void 1631 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1632 int reassoc, int resp) 1633 { 1634 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1635 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1636 /* XXX no better code */ 1637 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1638 ieee80211_node_leave(ni); 1639 } 1640 1641 static void 1642 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1643 int algo, int seq, int status) 1644 { 1645 struct ieee80211vap *vap = ni->ni_vap; 1646 1647 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1648 wh, NULL, "unsupported alg %d", algo); 1649 vap->iv_stats.is_rx_auth_unsupported++; 1650 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1651 seq | (status << 16)); 1652 } 1653 1654 static __inline int 1655 ishtmixed(const uint8_t *ie) 1656 { 1657 const struct ieee80211_ie_htinfo *ht = 1658 (const struct ieee80211_ie_htinfo *) ie; 1659 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1660 IEEE80211_HTINFO_OPMODE_MIXED; 1661 } 1662 1663 static int 1664 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1665 { 1666 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1667 int i; 1668 1669 /* NB: the 11b clients we care about will not have xrates */ 1670 if (xrates != NULL || rates == NULL) 1671 return 0; 1672 for (i = 0; i < rates[1]; i++) { 1673 int r = rates[2+i] & IEEE80211_RATE_VAL; 1674 if (r > 2*11 || ((1<<r) & brates) == 0) 1675 return 0; 1676 } 1677 return 1; 1678 } 1679 1680 static void 1681 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1682 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1683 { 1684 struct ieee80211vap *vap = ni->ni_vap; 1685 struct ieee80211com *ic = ni->ni_ic; 1686 struct ieee80211_frame *wh; 1687 uint8_t *frm, *efrm, *sfrm; 1688 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1689 int reassoc, resp; 1690 uint8_t rate; 1691 1692 wh = mtod(m0, struct ieee80211_frame *); 1693 frm = (uint8_t *)&wh[1]; 1694 efrm = mtod(m0, uint8_t *) + m0->m_len; 1695 switch (subtype) { 1696 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1697 case IEEE80211_FC0_SUBTYPE_BEACON: { 1698 struct ieee80211_scanparams scan; 1699 /* 1700 * We process beacon/probe response frames when scanning; 1701 * otherwise we check beacon frames for overlapping non-ERP 1702 * BSS in 11g and/or overlapping legacy BSS when in HT. 1703 */ 1704 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1705 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1706 vap->iv_stats.is_rx_mgtdiscard++; 1707 return; 1708 } 1709 /* NB: accept off-channel frames */ 1710 /* XXX TODO: use rxstatus to determine off-channel details */ 1711 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1712 return; 1713 /* 1714 * Count frame now that we know it's to be processed. 1715 */ 1716 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1717 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1718 IEEE80211_NODE_STAT(ni, rx_beacons); 1719 } else 1720 IEEE80211_NODE_STAT(ni, rx_proberesp); 1721 /* 1722 * If scanning, just pass information to the scan module. 1723 */ 1724 if (ic->ic_flags & IEEE80211_F_SCAN) { 1725 if (scan.status == 0 && /* NB: on channel */ 1726 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1727 /* 1728 * Actively scanning a channel marked passive; 1729 * send a probe request now that we know there 1730 * is 802.11 traffic present. 1731 * 1732 * XXX check if the beacon we recv'd gives 1733 * us what we need and suppress the probe req 1734 */ 1735 ieee80211_probe_curchan(vap, 1); 1736 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1737 } 1738 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh, 1739 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 * Consult the ACL policy module if setup. 1804 */ 1805 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1806 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1807 wh, NULL, "%s", "disallowed by ACL"); 1808 vap->iv_stats.is_rx_acl++; 1809 return; 1810 } 1811 /* 1812 * prreq frame format 1813 * [tlv] ssid 1814 * [tlv] supported rates 1815 * [tlv] extended supported rates 1816 */ 1817 ssid = rates = xrates = NULL; 1818 sfrm = frm; 1819 while (efrm - frm > 1) { 1820 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1821 switch (*frm) { 1822 case IEEE80211_ELEMID_SSID: 1823 ssid = frm; 1824 break; 1825 case IEEE80211_ELEMID_RATES: 1826 rates = frm; 1827 break; 1828 case IEEE80211_ELEMID_XRATES: 1829 xrates = frm; 1830 break; 1831 } 1832 frm += frm[1] + 2; 1833 } 1834 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1835 if (xrates != NULL) 1836 IEEE80211_VERIFY_ELEMENT(xrates, 1837 IEEE80211_RATE_MAXSIZE - rates[1], return); 1838 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1839 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1840 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1841 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1842 wh, NULL, 1843 "%s", "no ssid with ssid suppression enabled"); 1844 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1845 return; 1846 } 1847 1848 /* XXX find a better class or define it's own */ 1849 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1850 "%s", "recv probe req"); 1851 /* 1852 * Some legacy 11b clients cannot hack a complete 1853 * probe response frame. When the request includes 1854 * only a bare-bones rate set, communicate this to 1855 * the transmit side. 1856 */ 1857 ieee80211_send_proberesp(vap, wh->i_addr2, 1858 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1859 break; 1860 1861 case IEEE80211_FC0_SUBTYPE_AUTH: { 1862 uint16_t algo, seq, status; 1863 1864 if (vap->iv_state != IEEE80211_S_RUN) { 1865 vap->iv_stats.is_rx_mgtdiscard++; 1866 return; 1867 } 1868 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1869 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1870 wh, NULL, "%s", "wrong bssid"); 1871 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1872 return; 1873 } 1874 /* 1875 * auth frame format 1876 * [2] algorithm 1877 * [2] sequence 1878 * [2] status 1879 * [tlv*] challenge 1880 */ 1881 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1882 algo = le16toh(*(uint16_t *)frm); 1883 seq = le16toh(*(uint16_t *)(frm + 2)); 1884 status = le16toh(*(uint16_t *)(frm + 4)); 1885 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1886 "recv auth frame with algorithm %d seq %d", algo, seq); 1887 /* 1888 * Consult the ACL policy module if setup. 1889 */ 1890 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1891 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1892 wh, NULL, "%s", "disallowed by ACL"); 1893 vap->iv_stats.is_rx_acl++; 1894 ieee80211_send_error(ni, wh->i_addr2, 1895 IEEE80211_FC0_SUBTYPE_AUTH, 1896 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1897 return; 1898 } 1899 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1900 IEEE80211_DISCARD(vap, 1901 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1902 wh, NULL, "%s", "TKIP countermeasures enabled"); 1903 vap->iv_stats.is_rx_auth_countermeasures++; 1904 ieee80211_send_error(ni, wh->i_addr2, 1905 IEEE80211_FC0_SUBTYPE_AUTH, 1906 IEEE80211_REASON_MIC_FAILURE); 1907 return; 1908 } 1909 if (algo == IEEE80211_AUTH_ALG_SHARED) 1910 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1911 seq, status); 1912 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1913 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1914 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1915 authalgreject(ni, wh, algo, 1916 seq+1, IEEE80211_STATUS_ALG); 1917 return; 1918 } else { 1919 /* 1920 * We assume that an unknown algorithm is the result 1921 * of a decryption failure on a shared key auth frame; 1922 * return a status code appropriate for that instead 1923 * of IEEE80211_STATUS_ALG. 1924 * 1925 * NB: a seq# of 4 is intentional; the decrypted 1926 * frame likely has a bogus seq value. 1927 */ 1928 authalgreject(ni, wh, algo, 1929 4, IEEE80211_STATUS_CHALLENGE); 1930 return; 1931 } 1932 break; 1933 } 1934 1935 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1936 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1937 uint16_t capinfo, lintval; 1938 struct ieee80211_rsnparms rsnparms; 1939 1940 if (vap->iv_state != IEEE80211_S_RUN) { 1941 vap->iv_stats.is_rx_mgtdiscard++; 1942 return; 1943 } 1944 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1945 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1946 wh, NULL, "%s", "wrong bssid"); 1947 vap->iv_stats.is_rx_assoc_bss++; 1948 return; 1949 } 1950 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1951 reassoc = 1; 1952 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1953 } else { 1954 reassoc = 0; 1955 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1956 } 1957 if (ni == vap->iv_bss) { 1958 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1959 "deny %s request, sta not authenticated", 1960 reassoc ? "reassoc" : "assoc"); 1961 ieee80211_send_error(ni, wh->i_addr2, 1962 IEEE80211_FC0_SUBTYPE_DEAUTH, 1963 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1964 vap->iv_stats.is_rx_assoc_notauth++; 1965 return; 1966 } 1967 1968 /* 1969 * asreq frame format 1970 * [2] capability information 1971 * [2] listen interval 1972 * [6*] current AP address (reassoc only) 1973 * [tlv] ssid 1974 * [tlv] supported rates 1975 * [tlv] extended supported rates 1976 * [tlv] WPA or RSN 1977 * [tlv] HT capabilities 1978 * [tlv] Atheros capabilities 1979 */ 1980 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1981 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1982 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1983 if (reassoc) 1984 frm += 6; /* ignore current AP info */ 1985 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1986 sfrm = frm; 1987 while (efrm - frm > 1) { 1988 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1989 switch (*frm) { 1990 case IEEE80211_ELEMID_SSID: 1991 ssid = frm; 1992 break; 1993 case IEEE80211_ELEMID_RATES: 1994 rates = frm; 1995 break; 1996 case IEEE80211_ELEMID_XRATES: 1997 xrates = frm; 1998 break; 1999 case IEEE80211_ELEMID_RSN: 2000 rsn = frm; 2001 break; 2002 case IEEE80211_ELEMID_HTCAP: 2003 htcap = frm; 2004 break; 2005 case IEEE80211_ELEMID_VENDOR: 2006 if (iswpaoui(frm)) 2007 wpa = frm; 2008 else if (iswmeinfo(frm)) 2009 wme = frm; 2010 #ifdef IEEE80211_SUPPORT_SUPERG 2011 else if (isatherosoui(frm)) 2012 ath = frm; 2013 #endif 2014 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2015 if (ishtcapoui(frm) && htcap == NULL) 2016 htcap = frm; 2017 } 2018 break; 2019 } 2020 frm += frm[1] + 2; 2021 } 2022 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2023 if (xrates != NULL) 2024 IEEE80211_VERIFY_ELEMENT(xrates, 2025 IEEE80211_RATE_MAXSIZE - rates[1], return); 2026 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2027 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2028 if (htcap != NULL) { 2029 IEEE80211_VERIFY_LENGTH(htcap[1], 2030 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2031 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2032 sizeof(struct ieee80211_ie_htcap)-2, 2033 return); /* XXX just NULL out? */ 2034 } 2035 2036 if ((vap->iv_flags & IEEE80211_F_WPA) && 2037 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2038 return; 2039 /* discard challenge after association */ 2040 if (ni->ni_challenge != NULL) { 2041 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 2042 ni->ni_challenge = NULL; 2043 } 2044 /* NB: 802.11 spec says to ignore station's privacy bit */ 2045 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2046 capinfomismatch(ni, wh, reassoc, resp, 2047 "capability", capinfo); 2048 return; 2049 } 2050 /* 2051 * Disallow re-associate w/ invalid slot time setting. 2052 */ 2053 if (ni->ni_associd != 0 && 2054 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2055 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2056 capinfomismatch(ni, wh, reassoc, resp, 2057 "slot time", capinfo); 2058 return; 2059 } 2060 rate = ieee80211_setup_rates(ni, rates, xrates, 2061 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2062 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2063 if (rate & IEEE80211_RATE_BASIC) { 2064 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2065 vap->iv_stats.is_rx_assoc_norate++; 2066 return; 2067 } 2068 /* 2069 * If constrained to 11g-only stations reject an 2070 * 11b-only station. We cheat a bit here by looking 2071 * at the max negotiated xmit rate and assuming anyone 2072 * with a best rate <24Mb/s is an 11b station. 2073 */ 2074 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2075 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2076 vap->iv_stats.is_rx_assoc_norate++; 2077 return; 2078 } 2079 /* 2080 * Do HT rate set handling and setup HT node state. 2081 */ 2082 ni->ni_chan = vap->iv_bss->ni_chan; 2083 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2084 rate = ieee80211_setup_htrates(ni, htcap, 2085 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2086 IEEE80211_F_DOBRS); 2087 if (rate & IEEE80211_RATE_BASIC) { 2088 ratesetmismatch(ni, wh, reassoc, resp, 2089 "HT", rate); 2090 vap->iv_stats.is_ht_assoc_norate++; 2091 return; 2092 } 2093 ieee80211_ht_node_init(ni); 2094 ieee80211_ht_updatehtcap(ni, htcap); 2095 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2096 ieee80211_ht_node_cleanup(ni); 2097 #ifdef IEEE80211_SUPPORT_SUPERG 2098 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2099 ieee80211_ff_node_cleanup(ni); 2100 #endif 2101 /* 2102 * Allow AMPDU operation only with unencrypted traffic 2103 * or AES-CCM; the 11n spec only specifies these ciphers 2104 * so permitting any others is undefined and can lead 2105 * to interoperability problems. 2106 */ 2107 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2108 (((vap->iv_flags & IEEE80211_F_WPA) && 2109 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2110 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2111 IEEE80211_NOTE(vap, 2112 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2113 "disallow HT use because WEP or TKIP requested, " 2114 "capinfo 0x%x ucastcipher %d", capinfo, 2115 rsnparms.rsn_ucastcipher); 2116 ieee80211_ht_node_cleanup(ni); 2117 vap->iv_stats.is_ht_assoc_downgrade++; 2118 } 2119 /* 2120 * If constrained to 11n-only stations reject legacy stations. 2121 */ 2122 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2123 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2124 htcapmismatch(ni, wh, reassoc, resp); 2125 vap->iv_stats.is_ht_assoc_nohtcap++; 2126 return; 2127 } 2128 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2129 ni->ni_noise = nf; 2130 ni->ni_intval = lintval; 2131 ni->ni_capinfo = capinfo; 2132 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2133 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2134 /* 2135 * Store the IEs. 2136 * XXX maybe better to just expand 2137 */ 2138 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2139 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2140 if (wpa != NULL) 2141 setie(wpa_ie, wpa - sfrm); 2142 if (rsn != NULL) 2143 setie(rsn_ie, rsn - sfrm); 2144 if (htcap != NULL) 2145 setie(htcap_ie, htcap - sfrm); 2146 if (wme != NULL) { 2147 setie(wme_ie, wme - sfrm); 2148 /* 2149 * Mark node as capable of QoS. 2150 */ 2151 ni->ni_flags |= IEEE80211_NODE_QOS; 2152 } else 2153 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2154 #ifdef IEEE80211_SUPPORT_SUPERG 2155 if (ath != NULL) { 2156 setie(ath_ie, ath - sfrm); 2157 /* 2158 * Parse ATH station parameters. 2159 */ 2160 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2161 } else 2162 #endif 2163 ni->ni_ath_flags = 0; 2164 #undef setie 2165 } else { 2166 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2167 ni->ni_ath_flags = 0; 2168 } 2169 ieee80211_node_join(ni, resp); 2170 ieee80211_deliver_l2uf(ni); 2171 break; 2172 } 2173 2174 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2175 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2176 uint16_t reason; 2177 2178 if (vap->iv_state != IEEE80211_S_RUN || 2179 /* NB: can happen when in promiscuous mode */ 2180 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2181 vap->iv_stats.is_rx_mgtdiscard++; 2182 break; 2183 } 2184 /* 2185 * deauth/disassoc frame format 2186 * [2] reason 2187 */ 2188 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2189 reason = le16toh(*(uint16_t *)frm); 2190 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2191 vap->iv_stats.is_rx_deauth++; 2192 IEEE80211_NODE_STAT(ni, rx_deauth); 2193 } else { 2194 vap->iv_stats.is_rx_disassoc++; 2195 IEEE80211_NODE_STAT(ni, rx_disassoc); 2196 } 2197 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2198 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2199 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2200 if (ni != vap->iv_bss) 2201 ieee80211_node_leave(ni); 2202 break; 2203 } 2204 2205 case IEEE80211_FC0_SUBTYPE_ACTION: 2206 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2207 if (ni == vap->iv_bss) { 2208 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2209 wh, NULL, "%s", "unknown node"); 2210 vap->iv_stats.is_rx_mgtdiscard++; 2211 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2212 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2213 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2214 wh, NULL, "%s", "not for us"); 2215 vap->iv_stats.is_rx_mgtdiscard++; 2216 } else if (vap->iv_state != IEEE80211_S_RUN) { 2217 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2218 wh, NULL, "wrong state %s", 2219 ieee80211_state_name[vap->iv_state]); 2220 vap->iv_stats.is_rx_mgtdiscard++; 2221 } else { 2222 if (ieee80211_parse_action(ni, m0) == 0) 2223 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2224 } 2225 break; 2226 2227 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2228 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2229 case IEEE80211_FC0_SUBTYPE_ATIM: 2230 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2231 wh, NULL, "%s", "not handled"); 2232 vap->iv_stats.is_rx_mgtdiscard++; 2233 break; 2234 2235 default: 2236 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2237 wh, "mgt", "subtype 0x%x not handled", subtype); 2238 vap->iv_stats.is_rx_badsubtype++; 2239 break; 2240 } 2241 } 2242 2243 static void 2244 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2245 { 2246 switch (subtype) { 2247 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2248 ni->ni_vap->iv_recv_pspoll(ni, m); 2249 break; 2250 case IEEE80211_FC0_SUBTYPE_BAR: 2251 ieee80211_recv_bar(ni, m); 2252 break; 2253 } 2254 } 2255 2256 /* 2257 * Process a received ps-poll frame. 2258 */ 2259 void 2260 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2261 { 2262 struct ieee80211vap *vap = ni->ni_vap; 2263 struct ieee80211com *ic = vap->iv_ic; 2264 struct ieee80211_frame_min *wh; 2265 struct mbuf *m; 2266 uint16_t aid; 2267 int qlen; 2268 2269 wh = mtod(m0, struct ieee80211_frame_min *); 2270 if (ni->ni_associd == 0) { 2271 IEEE80211_DISCARD(vap, 2272 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2273 (struct ieee80211_frame *) wh, NULL, 2274 "%s", "unassociated station"); 2275 vap->iv_stats.is_ps_unassoc++; 2276 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2277 IEEE80211_REASON_NOT_ASSOCED); 2278 return; 2279 } 2280 2281 aid = le16toh(*(uint16_t *)wh->i_dur); 2282 if (aid != ni->ni_associd) { 2283 IEEE80211_DISCARD(vap, 2284 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2285 (struct ieee80211_frame *) wh, NULL, 2286 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2287 ni->ni_associd, aid); 2288 vap->iv_stats.is_ps_badaid++; 2289 /* 2290 * NB: We used to deauth the station but it turns out 2291 * the Blackberry Curve 8230 (and perhaps other devices) 2292 * sometimes send the wrong AID when WME is negotiated. 2293 * Being more lenient here seems ok as we already check 2294 * the station is associated and we only return frames 2295 * queued for the station (i.e. we don't use the AID). 2296 */ 2297 return; 2298 } 2299 2300 /* Okay, take the first queued packet and put it out... */ 2301 m = ieee80211_node_psq_dequeue(ni, &qlen); 2302 if (m == NULL) { 2303 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2304 "%s", "recv ps-poll, but queue empty"); 2305 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2306 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2307 if (vap->iv_set_tim != NULL) 2308 vap->iv_set_tim(ni, 0); /* just in case */ 2309 return; 2310 } 2311 /* 2312 * If there are more packets, set the more packets bit 2313 * in the packet dispatched to the station; otherwise 2314 * turn off the TIM bit. 2315 */ 2316 if (qlen != 0) { 2317 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2318 "recv ps-poll, send packet, %u still queued", qlen); 2319 m->m_flags |= M_MORE_DATA; 2320 } else { 2321 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2322 "%s", "recv ps-poll, send packet, queue empty"); 2323 if (vap->iv_set_tim != NULL) 2324 vap->iv_set_tim(ni, 0); 2325 } 2326 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2327 2328 /* 2329 * Do the right thing; if it's an encap'ed frame then 2330 * call ieee80211_parent_xmitpkt() (and free the ref) else 2331 * call ieee80211_vap_xmitpkt(). 2332 */ 2333 if (m->m_flags & M_ENCAP) { 2334 if (ieee80211_parent_xmitpkt(ic, m) != 0) 2335 ieee80211_free_node(ni); 2336 } else { 2337 (void) ieee80211_vap_xmitpkt(vap, m); 2338 } 2339 } 2340