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 <netproto/802_11/ieee80211_var.h> 59 #include <netproto/802_11/ieee80211_hostap.h> 60 #include <netproto/802_11/ieee80211_input.h> 61 #ifdef IEEE80211_SUPPORT_SUPERG 62 #include <netproto/802_11/ieee80211_superg.h> 63 #endif 64 #include <netproto/802_11/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 int rssi, int nf); 72 static void hostap_deliver_data(struct ieee80211vap *, 73 struct ieee80211_node *, struct mbuf *); 74 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 75 int subtype, int rssi, int nf); 76 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 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 vap->iv_recv_pspoll = ieee80211_recv_pspoll; 104 } 105 106 static void 107 sta_disassoc(void *arg, struct ieee80211_node *ni) 108 { 109 struct ieee80211vap *vap = arg; 110 111 if (ni->ni_vap == vap && ni->ni_associd != 0) { 112 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 113 IEEE80211_REASON_ASSOC_LEAVE); 114 ieee80211_node_leave(ni); 115 } 116 } 117 118 static void 119 sta_csa(void *arg, struct ieee80211_node *ni) 120 { 121 struct ieee80211vap *vap = arg; 122 123 if (ni->ni_vap == vap && ni->ni_associd != 0) 124 if (ni->ni_inact > vap->iv_inact_init) { 125 ni->ni_inact = vap->iv_inact_init; 126 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 127 "%s: inact %u", __func__, ni->ni_inact); 128 } 129 } 130 131 static void 132 sta_drop(void *arg, struct ieee80211_node *ni) 133 { 134 struct ieee80211vap *vap = arg; 135 136 if (ni->ni_vap == vap && ni->ni_associd != 0) 137 ieee80211_node_leave(ni); 138 } 139 140 /* 141 * Does a channel change require associated stations to re-associate 142 * so protocol state is correct. This is used when doing CSA across 143 * bands or similar (e.g. HT -> legacy). 144 */ 145 static int 146 isbandchange(struct ieee80211com *ic) 147 { 148 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 149 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 150 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 151 } 152 153 /* 154 * IEEE80211_M_HOSTAP vap state machine handler. 155 */ 156 static int 157 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 158 { 159 struct ieee80211com *ic = vap->iv_ic; 160 enum ieee80211_state ostate; 161 162 IEEE80211_LOCK_ASSERT(ic); 163 164 ostate = vap->iv_state; 165 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 166 __func__, ieee80211_state_name[ostate], 167 ieee80211_state_name[nstate], arg); 168 vap->iv_state = nstate; /* state transition */ 169 if (ostate != IEEE80211_S_SCAN) 170 ieee80211_cancel_scan(vap); /* background scan */ 171 switch (nstate) { 172 case IEEE80211_S_INIT: 173 switch (ostate) { 174 case IEEE80211_S_SCAN: 175 ieee80211_cancel_scan(vap); 176 break; 177 case IEEE80211_S_CAC: 178 ieee80211_dfs_cac_stop(vap); 179 break; 180 case IEEE80211_S_RUN: 181 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 182 break; 183 default: 184 break; 185 } 186 if (ostate != IEEE80211_S_INIT) { 187 /* NB: optimize INIT -> INIT case */ 188 ieee80211_reset_bss(vap); 189 } 190 if (vap->iv_auth->ia_detach != NULL) 191 vap->iv_auth->ia_detach(vap); 192 break; 193 case IEEE80211_S_SCAN: 194 switch (ostate) { 195 case IEEE80211_S_CSA: 196 case IEEE80211_S_RUN: 197 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 198 /* 199 * Clear overlapping BSS state; the beacon frame 200 * will be reconstructed on transition to the RUN 201 * state and the timeout routines check if the flag 202 * is set before doing anything so this is sufficient. 203 */ 204 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 205 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 206 /* fall thru... */ 207 case IEEE80211_S_CAC: 208 /* 209 * NB: We may get here because of a manual channel 210 * change in which case we need to stop CAC 211 * XXX no need to stop if ostate RUN but it's ok 212 */ 213 ieee80211_dfs_cac_stop(vap); 214 /* fall thru... */ 215 case IEEE80211_S_INIT: 216 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 217 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 218 /* 219 * Already have a channel; bypass the 220 * scan and startup immediately. 221 * ieee80211_create_ibss will call back to 222 * move us to RUN state. 223 */ 224 ieee80211_create_ibss(vap, vap->iv_des_chan); 225 break; 226 } 227 /* 228 * Initiate a scan. We can come here as a result 229 * of an IEEE80211_IOC_SCAN_REQ too in which case 230 * the vap will be marked with IEEE80211_FEXT_SCANREQ 231 * and the scan request parameters will be present 232 * in iv_scanreq. Otherwise we do the default. 233 */ 234 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 235 ieee80211_check_scan(vap, 236 vap->iv_scanreq_flags, 237 vap->iv_scanreq_duration, 238 vap->iv_scanreq_mindwell, 239 vap->iv_scanreq_maxdwell, 240 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 241 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 242 } else 243 ieee80211_check_scan_current(vap); 244 break; 245 case IEEE80211_S_SCAN: 246 /* 247 * A state change requires a reset; scan. 248 */ 249 ieee80211_check_scan_current(vap); 250 break; 251 default: 252 break; 253 } 254 break; 255 case IEEE80211_S_CAC: 256 /* 257 * Start CAC on a DFS channel. We come here when starting 258 * a bss on a DFS channel (see ieee80211_create_ibss). 259 */ 260 ieee80211_dfs_cac_start(vap); 261 break; 262 case IEEE80211_S_RUN: 263 if (vap->iv_flags & IEEE80211_F_WPA) { 264 /* XXX validate prerequisites */ 265 } 266 switch (ostate) { 267 case IEEE80211_S_INIT: 268 /* 269 * Already have a channel; bypass the 270 * scan and startup immediately. 271 * Note that ieee80211_create_ibss will call 272 * back to do a RUN->RUN state change. 273 */ 274 ieee80211_create_ibss(vap, 275 ieee80211_ht_adjust_channel(ic, 276 ic->ic_curchan, vap->iv_flags_ht)); 277 /* NB: iv_bss is changed on return */ 278 break; 279 case IEEE80211_S_CAC: 280 /* 281 * NB: This is the normal state change when CAC 282 * expires and no radar was detected; no need to 283 * clear the CAC timer as it's already expired. 284 */ 285 /* fall thru... */ 286 case IEEE80211_S_CSA: 287 /* 288 * Shorten inactivity timer of associated stations 289 * to weed out sta's that don't follow a CSA. 290 */ 291 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 292 /* 293 * Update bss node channel to reflect where 294 * we landed after CSA. 295 */ 296 ieee80211_node_set_chan(vap->iv_bss, 297 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 298 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 299 /* XXX bypass debug msgs */ 300 break; 301 case IEEE80211_S_SCAN: 302 case IEEE80211_S_RUN: 303 #ifdef IEEE80211_DEBUG 304 if (ieee80211_msg_debug(vap)) { 305 struct ieee80211_node *ni = vap->iv_bss; 306 ieee80211_note(vap, 307 "synchronized with %s ssid ", 308 ether_sprintf(ni->ni_bssid)); 309 ieee80211_print_essid(ni->ni_essid, 310 ni->ni_esslen); 311 /* XXX MCS/HT */ 312 kprintf(" channel %d start %uMb\n", 313 ieee80211_chan2ieee(ic, ic->ic_curchan), 314 IEEE80211_RATE2MBS(ni->ni_txrate)); 315 } 316 #endif 317 break; 318 default: 319 break; 320 } 321 /* 322 * Start/stop the authenticator. We delay until here 323 * to allow configuration to happen out of order. 324 */ 325 if (vap->iv_auth->ia_attach != NULL) { 326 /* XXX check failure */ 327 vap->iv_auth->ia_attach(vap); 328 } else if (vap->iv_auth->ia_detach != NULL) { 329 vap->iv_auth->ia_detach(vap); 330 } 331 ieee80211_node_authorize(vap->iv_bss); 332 break; 333 case IEEE80211_S_CSA: 334 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 335 /* 336 * On a ``band change'' silently drop associated 337 * stations as they must re-associate before they 338 * can pass traffic (as otherwise protocol state 339 * such as capabilities and the negotiated rate 340 * set may/will be wrong). 341 */ 342 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 343 } 344 break; 345 default: 346 break; 347 } 348 return 0; 349 } 350 351 static void 352 hostap_deliver_data(struct ieee80211vap *vap, 353 struct ieee80211_node *ni, struct mbuf *m) 354 { 355 struct ether_header *eh = mtod(m, struct ether_header *); 356 struct ifnet *ifp = vap->iv_ifp; 357 358 /* clear driver/net80211 flags before passing up */ 359 #if __FreeBSD_version >= 1000046 360 m->m_flags &= ~(M_MCAST | M_BCAST); 361 m_clrprotoflags(m); 362 #else 363 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 364 #endif 365 366 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 367 ("gack, opmode %d", vap->iv_opmode)); 368 /* 369 * Do accounting. 370 */ 371 IFNET_STAT_INC(ifp, ipackets, 1); 372 IEEE80211_NODE_STAT(ni, rx_data); 373 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 374 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 375 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 376 IEEE80211_NODE_STAT(ni, rx_mcast); 377 } else 378 IEEE80211_NODE_STAT(ni, rx_ucast); 379 380 /* perform as a bridge within the AP */ 381 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 382 struct mbuf *mcopy = NULL; 383 384 if (m->m_flags & M_MCAST) { 385 mcopy = m_dup(m, M_NOWAIT); 386 if (mcopy == NULL) 387 IFNET_STAT_INC(ifp, oerrors, 1); 388 else 389 mcopy->m_flags |= M_MCAST; 390 } else { 391 /* 392 * Check if the destination is associated with the 393 * same vap and authorized to receive traffic. 394 * Beware of traffic destined for the vap itself; 395 * sending it will not work; just let it be delivered 396 * normally. 397 */ 398 struct ieee80211_node *sta = ieee80211_find_vap_node( 399 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 400 if (sta != NULL) { 401 if (ieee80211_node_is_authorized(sta)) { 402 /* 403 * Beware of sending to ourself; this 404 * needs to happen via the normal 405 * input path. 406 */ 407 if (sta != vap->iv_bss) { 408 mcopy = m; 409 m = NULL; 410 } 411 } else { 412 vap->iv_stats.is_rx_unauth++; 413 IEEE80211_NODE_STAT(sta, rx_unauth); 414 } 415 ieee80211_free_node(sta); 416 } 417 } 418 if (mcopy != NULL) { 419 int len, err; 420 len = mcopy->m_pkthdr.len; 421 err = ieee80211_vap_xmitpkt(vap, mcopy); 422 if (err) { 423 /* NB: IFQ_HANDOFF reclaims mcopy */ 424 } else { 425 IFNET_STAT_INC(ifp, opackets, 1); 426 } 427 } 428 } 429 if (m != NULL) { 430 /* 431 * Mark frame as coming from vap's interface. 432 */ 433 m->m_pkthdr.rcvif = ifp; 434 if (m->m_flags & M_MCAST) { 435 /* 436 * Spam DWDS vap's w/ multicast traffic. 437 */ 438 /* XXX only if dwds in use? */ 439 ieee80211_dwds_mcast(vap, m); 440 } 441 if (ni->ni_vlan != 0) { 442 /* attach vlan tag */ 443 #if defined(__DragonFly__) 444 /* XXX ntohs() needed? */ 445 m->m_pkthdr.ether_vlantag = ni->ni_vlan; 446 #else 447 m->m_pkthdr.ether_vtag = ni->ni_vlan; 448 #endif 449 m->m_flags |= M_VLANTAG; 450 } 451 ifp->if_input(ifp, m, NULL, -1); 452 } 453 } 454 455 /* 456 * Decide if a received management frame should be 457 * printed when debugging is enabled. This filters some 458 * of the less interesting frames that come frequently 459 * (e.g. beacons). 460 */ 461 static __inline int 462 doprint(struct ieee80211vap *vap, int subtype) 463 { 464 switch (subtype) { 465 case IEEE80211_FC0_SUBTYPE_BEACON: 466 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 467 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 468 return 0; 469 } 470 return 1; 471 } 472 473 /* 474 * Process a received frame. The node associated with the sender 475 * should be supplied. If nothing was found in the node table then 476 * the caller is assumed to supply a reference to iv_bss instead. 477 * The RSSI and a timestamp are also supplied. The RSSI data is used 478 * during AP scanning to select a AP to associate with; it can have 479 * any units so long as values have consistent units and higher values 480 * mean ``better signal''. The receive timestamp is currently not used 481 * by the 802.11 layer. 482 */ 483 static int 484 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 485 { 486 #define HAS_SEQ(type) ((type & 0x4) == 0) 487 struct ieee80211vap *vap = ni->ni_vap; 488 struct ieee80211com *ic = ni->ni_ic; 489 struct ifnet *ifp = vap->iv_ifp; 490 struct ieee80211_frame *wh; 491 struct ieee80211_key *key; 492 struct ether_header *eh; 493 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 494 uint8_t dir, type, subtype, qos; 495 uint8_t *bssid; 496 uint16_t rxseq; 497 498 if (m->m_flags & M_AMPDU_MPDU) { 499 /* 500 * Fastpath for A-MPDU reorder q resubmission. Frames 501 * w/ M_AMPDU_MPDU marked have already passed through 502 * here but were received out of order and been held on 503 * the reorder queue. When resubmitted they are marked 504 * with the M_AMPDU_MPDU flag and we can bypass most of 505 * the normal processing. 506 */ 507 wh = mtod(m, struct ieee80211_frame *); 508 type = IEEE80211_FC0_TYPE_DATA; 509 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 510 subtype = IEEE80211_FC0_SUBTYPE_QOS; 511 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 512 goto resubmit_ampdu; 513 } 514 515 KASSERT(ni != NULL, ("null node")); 516 ni->ni_inact = ni->ni_inact_reload; 517 518 type = -1; /* undefined */ 519 520 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 521 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 522 ni->ni_macaddr, NULL, 523 "too short (1): len %u", m->m_pkthdr.len); 524 vap->iv_stats.is_rx_tooshort++; 525 goto out; 526 } 527 /* 528 * Bit of a cheat here, we use a pointer for a 3-address 529 * frame format but don't reference fields past outside 530 * ieee80211_frame_min w/o first validating the data is 531 * present. 532 */ 533 wh = mtod(m, struct ieee80211_frame *); 534 535 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 536 IEEE80211_FC0_VERSION_0) { 537 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 538 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 539 wh->i_fc[0], wh->i_fc[1]); 540 vap->iv_stats.is_rx_badversion++; 541 goto err; 542 } 543 544 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 545 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 546 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 547 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 548 if (dir != IEEE80211_FC1_DIR_NODS) 549 bssid = wh->i_addr1; 550 else if (type == IEEE80211_FC0_TYPE_CTL) 551 bssid = wh->i_addr1; 552 else { 553 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 554 IEEE80211_DISCARD_MAC(vap, 555 IEEE80211_MSG_ANY, ni->ni_macaddr, 556 NULL, "too short (2): len %u", 557 m->m_pkthdr.len); 558 vap->iv_stats.is_rx_tooshort++; 559 goto out; 560 } 561 bssid = wh->i_addr3; 562 } 563 /* 564 * Validate the bssid. 565 */ 566 if (!(type == IEEE80211_FC0_TYPE_MGT && 567 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 568 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 569 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 570 /* not interested in */ 571 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 572 bssid, NULL, "%s", "not to bss"); 573 vap->iv_stats.is_rx_wrongbss++; 574 goto out; 575 } 576 577 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 578 ni->ni_noise = nf; 579 if (HAS_SEQ(type)) { 580 uint8_t tid = ieee80211_gettid(wh); 581 if (IEEE80211_QOS_HAS_SEQ(wh) && 582 TID_TO_WME_AC(tid) >= WME_AC_VI) 583 ic->ic_wme.wme_hipri_traffic++; 584 rxseq = le16toh(*(uint16_t *)wh->i_seq); 585 if (! ieee80211_check_rxseq(ni, wh)) { 586 /* duplicate, discard */ 587 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 588 bssid, "duplicate", 589 "seqno <%u,%u> fragno <%u,%u> tid %u", 590 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 591 ni->ni_rxseqs[tid] >> 592 IEEE80211_SEQ_SEQ_SHIFT, 593 rxseq & IEEE80211_SEQ_FRAG_MASK, 594 ni->ni_rxseqs[tid] & 595 IEEE80211_SEQ_FRAG_MASK, 596 tid); 597 vap->iv_stats.is_rx_dup++; 598 IEEE80211_NODE_STAT(ni, rx_dup); 599 goto out; 600 } 601 ni->ni_rxseqs[tid] = rxseq; 602 } 603 } 604 605 switch (type) { 606 case IEEE80211_FC0_TYPE_DATA: 607 hdrspace = ieee80211_hdrspace(ic, wh); 608 if (m->m_len < hdrspace && 609 (m = m_pullup(m, hdrspace)) == NULL) { 610 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 611 ni->ni_macaddr, NULL, 612 "data too short: expecting %u", hdrspace); 613 vap->iv_stats.is_rx_tooshort++; 614 goto out; /* XXX */ 615 } 616 if (!(dir == IEEE80211_FC1_DIR_TODS || 617 (dir == IEEE80211_FC1_DIR_DSTODS && 618 (vap->iv_flags & IEEE80211_F_DWDS)))) { 619 if (dir != IEEE80211_FC1_DIR_DSTODS) { 620 IEEE80211_DISCARD(vap, 621 IEEE80211_MSG_INPUT, wh, "data", 622 "incorrect dir 0x%x", dir); 623 } else { 624 IEEE80211_DISCARD(vap, 625 IEEE80211_MSG_INPUT | 626 IEEE80211_MSG_WDS, wh, 627 "4-address data", 628 "%s", "DWDS not enabled"); 629 } 630 vap->iv_stats.is_rx_wrongdir++; 631 goto out; 632 } 633 /* check if source STA is associated */ 634 if (ni == vap->iv_bss) { 635 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 636 wh, "data", "%s", "unknown src"); 637 ieee80211_send_error(ni, wh->i_addr2, 638 IEEE80211_FC0_SUBTYPE_DEAUTH, 639 IEEE80211_REASON_NOT_AUTHED); 640 vap->iv_stats.is_rx_notassoc++; 641 goto err; 642 } 643 if (ni->ni_associd == 0) { 644 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 645 wh, "data", "%s", "unassoc src"); 646 IEEE80211_SEND_MGMT(ni, 647 IEEE80211_FC0_SUBTYPE_DISASSOC, 648 IEEE80211_REASON_NOT_ASSOCED); 649 vap->iv_stats.is_rx_notassoc++; 650 goto err; 651 } 652 653 /* 654 * Check for power save state change. 655 * XXX out-of-order A-MPDU frames? 656 */ 657 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 658 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 659 vap->iv_node_ps(ni, 660 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 661 /* 662 * For 4-address packets handle WDS discovery 663 * notifications. Once a WDS link is setup frames 664 * are just delivered to the WDS vap (see below). 665 */ 666 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 667 if (!ieee80211_node_is_authorized(ni)) { 668 IEEE80211_DISCARD(vap, 669 IEEE80211_MSG_INPUT | 670 IEEE80211_MSG_WDS, wh, 671 "4-address data", 672 "%s", "unauthorized port"); 673 vap->iv_stats.is_rx_unauth++; 674 IEEE80211_NODE_STAT(ni, rx_unauth); 675 goto err; 676 } 677 ieee80211_dwds_discover(ni, m); 678 return type; 679 } 680 681 /* 682 * Handle A-MPDU re-ordering. If the frame is to be 683 * processed directly then ieee80211_ampdu_reorder 684 * will return 0; otherwise it has consumed the mbuf 685 * and we should do nothing more with it. 686 */ 687 if ((m->m_flags & M_AMPDU) && 688 ieee80211_ampdu_reorder(ni, m) != 0) { 689 m = NULL; 690 goto out; 691 } 692 resubmit_ampdu: 693 694 /* 695 * Handle privacy requirements. Note that we 696 * must not be preempted from here until after 697 * we (potentially) call ieee80211_crypto_demic; 698 * otherwise we may violate assumptions in the 699 * crypto cipher modules used to do delayed update 700 * of replay sequence numbers. 701 */ 702 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 703 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 704 /* 705 * Discard encrypted frames when privacy is off. 706 */ 707 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 708 wh, "WEP", "%s", "PRIVACY off"); 709 vap->iv_stats.is_rx_noprivacy++; 710 IEEE80211_NODE_STAT(ni, rx_noprivacy); 711 goto out; 712 } 713 key = ieee80211_crypto_decap(ni, m, hdrspace); 714 if (key == NULL) { 715 /* NB: stats+msgs handled in crypto_decap */ 716 IEEE80211_NODE_STAT(ni, rx_wepfail); 717 goto out; 718 } 719 wh = mtod(m, struct ieee80211_frame *); 720 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 721 } else { 722 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 723 key = NULL; 724 } 725 726 /* 727 * Save QoS bits for use below--before we strip the header. 728 */ 729 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 730 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 731 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 732 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 733 } else 734 qos = 0; 735 736 /* 737 * Next up, any fragmentation. 738 */ 739 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 740 m = ieee80211_defrag(ni, m, hdrspace); 741 if (m == NULL) { 742 /* Fragment dropped or frame not complete yet */ 743 goto out; 744 } 745 } 746 wh = NULL; /* no longer valid, catch any uses */ 747 748 /* 749 * Next strip any MSDU crypto bits. 750 */ 751 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 752 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 753 ni->ni_macaddr, "data", "%s", "demic error"); 754 vap->iv_stats.is_rx_demicfail++; 755 IEEE80211_NODE_STAT(ni, rx_demicfail); 756 goto out; 757 } 758 /* copy to listener after decrypt */ 759 if (ieee80211_radiotap_active_vap(vap)) 760 ieee80211_radiotap_rx(vap, m); 761 need_tap = 0; 762 /* 763 * Finally, strip the 802.11 header. 764 */ 765 m = ieee80211_decap(vap, m, hdrspace); 766 if (m == NULL) { 767 /* XXX mask bit to check for both */ 768 /* don't count Null data frames as errors */ 769 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 770 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 771 goto out; 772 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 773 ni->ni_macaddr, "data", "%s", "decap error"); 774 vap->iv_stats.is_rx_decap++; 775 IEEE80211_NODE_STAT(ni, rx_decap); 776 goto err; 777 } 778 eh = mtod(m, struct ether_header *); 779 if (!ieee80211_node_is_authorized(ni)) { 780 /* 781 * Deny any non-PAE frames received prior to 782 * authorization. For open/shared-key 783 * authentication the port is mark authorized 784 * after authentication completes. For 802.1x 785 * the port is not marked authorized by the 786 * authenticator until the handshake has completed. 787 */ 788 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 789 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 790 eh->ether_shost, "data", 791 "unauthorized port: ether type 0x%x len %u", 792 eh->ether_type, m->m_pkthdr.len); 793 vap->iv_stats.is_rx_unauth++; 794 IEEE80211_NODE_STAT(ni, rx_unauth); 795 goto err; 796 } 797 } else { 798 /* 799 * When denying unencrypted frames, discard 800 * any non-PAE frames received without encryption. 801 */ 802 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 803 (key == NULL && (m->m_flags & M_WEP) == 0) && 804 eh->ether_type != htons(ETHERTYPE_PAE)) { 805 /* 806 * Drop unencrypted frames. 807 */ 808 vap->iv_stats.is_rx_unencrypted++; 809 IEEE80211_NODE_STAT(ni, rx_unencrypted); 810 goto out; 811 } 812 } 813 /* XXX require HT? */ 814 if (qos & IEEE80211_QOS_AMSDU) { 815 m = ieee80211_decap_amsdu(ni, m); 816 if (m == NULL) 817 return IEEE80211_FC0_TYPE_DATA; 818 } else { 819 #ifdef IEEE80211_SUPPORT_SUPERG 820 m = ieee80211_decap_fastframe(vap, ni, m); 821 if (m == NULL) 822 return IEEE80211_FC0_TYPE_DATA; 823 #endif 824 } 825 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 826 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 827 else 828 hostap_deliver_data(vap, ni, m); 829 return IEEE80211_FC0_TYPE_DATA; 830 831 case IEEE80211_FC0_TYPE_MGT: 832 vap->iv_stats.is_rx_mgmt++; 833 IEEE80211_NODE_STAT(ni, rx_mgmt); 834 if (dir != IEEE80211_FC1_DIR_NODS) { 835 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 836 wh, "mgt", "incorrect dir 0x%x", dir); 837 vap->iv_stats.is_rx_wrongdir++; 838 goto err; 839 } 840 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 841 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 842 ni->ni_macaddr, "mgt", "too short: len %u", 843 m->m_pkthdr.len); 844 vap->iv_stats.is_rx_tooshort++; 845 goto out; 846 } 847 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 848 /* ensure return frames are unicast */ 849 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 850 wh, NULL, "source is multicast: %s", 851 ether_sprintf(wh->i_addr2)); 852 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 853 goto out; 854 } 855 #ifdef IEEE80211_DEBUG 856 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 857 ieee80211_msg_dumppkts(vap)) { 858 if_printf(ifp, "received %s from %s rssi %d\n", 859 ieee80211_mgt_subtype_name[subtype >> 860 IEEE80211_FC0_SUBTYPE_SHIFT], 861 ether_sprintf(wh->i_addr2), rssi); 862 } 863 #endif 864 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 865 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 866 /* 867 * Only shared key auth frames with a challenge 868 * should be encrypted, discard all others. 869 */ 870 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 871 wh, NULL, 872 "%s", "WEP set but not permitted"); 873 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 874 goto out; 875 } 876 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 877 /* 878 * Discard encrypted frames when privacy is off. 879 */ 880 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 881 wh, NULL, "%s", "WEP set but PRIVACY off"); 882 vap->iv_stats.is_rx_noprivacy++; 883 goto out; 884 } 885 hdrspace = ieee80211_hdrspace(ic, wh); 886 key = ieee80211_crypto_decap(ni, m, hdrspace); 887 if (key == NULL) { 888 /* NB: stats+msgs handled in crypto_decap */ 889 goto out; 890 } 891 wh = mtod(m, struct ieee80211_frame *); 892 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 893 } 894 /* 895 * Pass the packet to radiotap before calling iv_recv_mgmt(). 896 * Otherwise iv_recv_mgmt() might pass another packet to 897 * radiotap, resulting in out of order packet captures. 898 */ 899 if (ieee80211_radiotap_active_vap(vap)) 900 ieee80211_radiotap_rx(vap, m); 901 need_tap = 0; 902 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 903 goto out; 904 905 case IEEE80211_FC0_TYPE_CTL: 906 vap->iv_stats.is_rx_ctl++; 907 IEEE80211_NODE_STAT(ni, rx_ctrl); 908 vap->iv_recv_ctl(ni, m, subtype); 909 goto out; 910 default: 911 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 912 wh, "bad", "frame type 0x%x", type); 913 /* should not come here */ 914 break; 915 } 916 err: 917 IFNET_STAT_INC(ifp, ierrors, 1); 918 out: 919 if (m != NULL) { 920 if (need_tap && ieee80211_radiotap_active_vap(vap)) 921 ieee80211_radiotap_rx(vap, m); 922 m_freem(m); 923 } 924 return type; 925 } 926 927 static void 928 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 929 int rssi, int nf, uint16_t seq, uint16_t status) 930 { 931 struct ieee80211vap *vap = ni->ni_vap; 932 933 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 934 935 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 936 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 937 ni->ni_macaddr, "open auth", 938 "bad sta auth mode %u", ni->ni_authmode); 939 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 940 /* 941 * Clear any challenge text that may be there if 942 * a previous shared key auth failed and then an 943 * open auth is attempted. 944 */ 945 if (ni->ni_challenge != NULL) { 946 kfree(ni->ni_challenge, M_80211_NODE); 947 ni->ni_challenge = NULL; 948 } 949 /* XXX hack to workaround calling convention */ 950 ieee80211_send_error(ni, wh->i_addr2, 951 IEEE80211_FC0_SUBTYPE_AUTH, 952 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 953 return; 954 } 955 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 956 vap->iv_stats.is_rx_bad_auth++; 957 return; 958 } 959 /* always accept open authentication requests */ 960 if (ni == vap->iv_bss) { 961 ni = ieee80211_dup_bss(vap, wh->i_addr2); 962 if (ni == NULL) 963 return; 964 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 965 (void) ieee80211_ref_node(ni); 966 /* 967 * Mark the node as referenced to reflect that it's 968 * reference count has been bumped to insure it remains 969 * after the transaction completes. 970 */ 971 ni->ni_flags |= IEEE80211_NODE_AREF; 972 /* 973 * Mark the node as requiring a valid association id 974 * before outbound traffic is permitted. 975 */ 976 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 977 978 if (vap->iv_acl != NULL && 979 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 980 /* 981 * When the ACL policy is set to RADIUS we defer the 982 * authorization to a user agent. Dispatch an event, 983 * a subsequent MLME call will decide the fate of the 984 * station. If the user agent is not present then the 985 * node will be reclaimed due to inactivity. 986 */ 987 IEEE80211_NOTE_MAC(vap, 988 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 989 "%s", "station authentication defered (radius acl)"); 990 ieee80211_notify_node_auth(ni); 991 } else { 992 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 993 IEEE80211_NOTE_MAC(vap, 994 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 995 "%s", "station authenticated (open)"); 996 /* 997 * When 802.1x is not in use mark the port 998 * authorized at this point so traffic can flow. 999 */ 1000 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 1001 ieee80211_node_authorize(ni); 1002 } 1003 } 1004 1005 static void 1006 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1007 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1008 uint16_t seq, uint16_t status) 1009 { 1010 struct ieee80211vap *vap = ni->ni_vap; 1011 uint8_t *challenge; 1012 int allocbs, estatus; 1013 1014 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1015 1016 /* 1017 * NB: this can happen as we allow pre-shared key 1018 * authentication to be enabled w/o wep being turned 1019 * on so that configuration of these can be done 1020 * in any order. It may be better to enforce the 1021 * ordering in which case this check would just be 1022 * for sanity/consistency. 1023 */ 1024 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1025 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1026 ni->ni_macaddr, "shared key auth", 1027 "%s", " PRIVACY is disabled"); 1028 estatus = IEEE80211_STATUS_ALG; 1029 goto bad; 1030 } 1031 /* 1032 * Pre-shared key authentication is evil; accept 1033 * it only if explicitly configured (it is supported 1034 * mainly for compatibility with clients like Mac OS X). 1035 */ 1036 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1037 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1038 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1039 ni->ni_macaddr, "shared key auth", 1040 "bad sta auth mode %u", ni->ni_authmode); 1041 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1042 estatus = IEEE80211_STATUS_ALG; 1043 goto bad; 1044 } 1045 1046 challenge = NULL; 1047 if (frm + 1 < efrm) { 1048 if ((frm[1] + 2) > (efrm - frm)) { 1049 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1050 ni->ni_macaddr, "shared key auth", 1051 "ie %d/%ld too long", 1052 frm[0], (frm[1] + 2) - (efrm - frm)); 1053 vap->iv_stats.is_rx_bad_auth++; 1054 estatus = IEEE80211_STATUS_CHALLENGE; 1055 goto bad; 1056 } 1057 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1058 challenge = frm; 1059 frm += frm[1] + 2; 1060 } 1061 switch (seq) { 1062 case IEEE80211_AUTH_SHARED_CHALLENGE: 1063 case IEEE80211_AUTH_SHARED_RESPONSE: 1064 if (challenge == NULL) { 1065 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1066 ni->ni_macaddr, "shared key auth", 1067 "%s", "no challenge"); 1068 vap->iv_stats.is_rx_bad_auth++; 1069 estatus = IEEE80211_STATUS_CHALLENGE; 1070 goto bad; 1071 } 1072 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1073 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1074 ni->ni_macaddr, "shared key auth", 1075 "bad challenge len %d", challenge[1]); 1076 vap->iv_stats.is_rx_bad_auth++; 1077 estatus = IEEE80211_STATUS_CHALLENGE; 1078 goto bad; 1079 } 1080 default: 1081 break; 1082 } 1083 switch (seq) { 1084 case IEEE80211_AUTH_SHARED_REQUEST: 1085 if (ni == vap->iv_bss) { 1086 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1087 if (ni == NULL) { 1088 /* NB: no way to return an error */ 1089 return; 1090 } 1091 allocbs = 1; 1092 } else { 1093 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1094 (void) ieee80211_ref_node(ni); 1095 allocbs = 0; 1096 } 1097 /* 1098 * Mark the node as referenced to reflect that it's 1099 * reference count has been bumped to insure it remains 1100 * after the transaction completes. 1101 */ 1102 ni->ni_flags |= IEEE80211_NODE_AREF; 1103 /* 1104 * Mark the node as requiring a valid associatio id 1105 * before outbound traffic is permitted. 1106 */ 1107 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1108 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1109 ni->ni_noise = nf; 1110 if (!ieee80211_alloc_challenge(ni)) { 1111 /* NB: don't return error so they rexmit */ 1112 return; 1113 } 1114 get_random_bytes(ni->ni_challenge, 1115 IEEE80211_CHALLENGE_LEN); 1116 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1117 ni, "shared key %sauth request", allocbs ? "" : "re"); 1118 /* 1119 * When the ACL policy is set to RADIUS we defer the 1120 * authorization to a user agent. Dispatch an event, 1121 * a subsequent MLME call will decide the fate of the 1122 * station. If the user agent is not present then the 1123 * node will be reclaimed due to inactivity. 1124 */ 1125 if (vap->iv_acl != NULL && 1126 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1127 IEEE80211_NOTE_MAC(vap, 1128 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1129 ni->ni_macaddr, 1130 "%s", "station authentication defered (radius acl)"); 1131 ieee80211_notify_node_auth(ni); 1132 return; 1133 } 1134 break; 1135 case IEEE80211_AUTH_SHARED_RESPONSE: 1136 if (ni == vap->iv_bss) { 1137 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1138 ni->ni_macaddr, "shared key response", 1139 "%s", "unknown station"); 1140 /* NB: don't send a response */ 1141 return; 1142 } 1143 if (ni->ni_challenge == NULL) { 1144 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1145 ni->ni_macaddr, "shared key response", 1146 "%s", "no challenge recorded"); 1147 vap->iv_stats.is_rx_bad_auth++; 1148 estatus = IEEE80211_STATUS_CHALLENGE; 1149 goto bad; 1150 } 1151 if (memcmp(ni->ni_challenge, &challenge[2], 1152 challenge[1]) != 0) { 1153 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1154 ni->ni_macaddr, "shared key response", 1155 "%s", "challenge mismatch"); 1156 vap->iv_stats.is_rx_auth_fail++; 1157 estatus = IEEE80211_STATUS_CHALLENGE; 1158 goto bad; 1159 } 1160 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1161 ni, "%s", "station authenticated (shared key)"); 1162 ieee80211_node_authorize(ni); 1163 break; 1164 default: 1165 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1166 ni->ni_macaddr, "shared key auth", 1167 "bad seq %d", seq); 1168 vap->iv_stats.is_rx_bad_auth++; 1169 estatus = IEEE80211_STATUS_SEQUENCE; 1170 goto bad; 1171 } 1172 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1173 return; 1174 bad: 1175 /* 1176 * Send an error response; but only when operating as an AP. 1177 */ 1178 /* XXX hack to workaround calling convention */ 1179 ieee80211_send_error(ni, wh->i_addr2, 1180 IEEE80211_FC0_SUBTYPE_AUTH, 1181 (seq + 1) | (estatus<<16)); 1182 } 1183 1184 /* 1185 * Convert a WPA cipher selector OUI to an internal 1186 * cipher algorithm. Where appropriate we also 1187 * record any key length. 1188 */ 1189 static int 1190 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1191 { 1192 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1193 uint32_t w = LE_READ_4(sel); 1194 1195 switch (w) { 1196 case WPA_SEL(WPA_CSE_NULL): 1197 return IEEE80211_CIPHER_NONE; 1198 case WPA_SEL(WPA_CSE_WEP40): 1199 if (keylen) 1200 *keylen = 40 / NBBY; 1201 return IEEE80211_CIPHER_WEP; 1202 case WPA_SEL(WPA_CSE_WEP104): 1203 if (keylen) 1204 *keylen = 104 / NBBY; 1205 return IEEE80211_CIPHER_WEP; 1206 case WPA_SEL(WPA_CSE_TKIP): 1207 return IEEE80211_CIPHER_TKIP; 1208 case WPA_SEL(WPA_CSE_CCMP): 1209 return IEEE80211_CIPHER_AES_CCM; 1210 } 1211 return 32; /* NB: so 1<< is discarded */ 1212 #undef WPA_SEL 1213 } 1214 1215 /* 1216 * Convert a WPA key management/authentication algorithm 1217 * to an internal code. 1218 */ 1219 static int 1220 wpa_keymgmt(const uint8_t *sel) 1221 { 1222 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1223 uint32_t w = LE_READ_4(sel); 1224 1225 switch (w) { 1226 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1227 return WPA_ASE_8021X_UNSPEC; 1228 case WPA_SEL(WPA_ASE_8021X_PSK): 1229 return WPA_ASE_8021X_PSK; 1230 case WPA_SEL(WPA_ASE_NONE): 1231 return WPA_ASE_NONE; 1232 } 1233 return 0; /* NB: so is discarded */ 1234 #undef WPA_SEL 1235 } 1236 1237 /* 1238 * Parse a WPA information element to collect parameters. 1239 * Note that we do not validate security parameters; that 1240 * is handled by the authenticator; the parsing done here 1241 * is just for internal use in making operational decisions. 1242 */ 1243 static int 1244 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1245 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1246 { 1247 uint8_t len = frm[1]; 1248 uint32_t w; 1249 int n; 1250 1251 /* 1252 * Check the length once for fixed parts: OUI, type, 1253 * version, mcast cipher, and 2 selector counts. 1254 * Other, variable-length data, must be checked separately. 1255 */ 1256 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1257 IEEE80211_DISCARD_IE(vap, 1258 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1259 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1260 return IEEE80211_REASON_IE_INVALID; 1261 } 1262 if (len < 14) { 1263 IEEE80211_DISCARD_IE(vap, 1264 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1265 wh, "WPA", "too short, len %u", len); 1266 return IEEE80211_REASON_IE_INVALID; 1267 } 1268 frm += 6, len -= 4; /* NB: len is payload only */ 1269 /* NB: iswpaoui already validated the OUI and type */ 1270 w = LE_READ_2(frm); 1271 if (w != WPA_VERSION) { 1272 IEEE80211_DISCARD_IE(vap, 1273 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1274 wh, "WPA", "bad version %u", w); 1275 return IEEE80211_REASON_IE_INVALID; 1276 } 1277 frm += 2, len -= 2; 1278 1279 memset(rsn, 0, sizeof(*rsn)); 1280 1281 /* multicast/group cipher */ 1282 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1283 frm += 4, len -= 4; 1284 1285 /* unicast ciphers */ 1286 n = LE_READ_2(frm); 1287 frm += 2, len -= 2; 1288 if (len < n*4+2) { 1289 IEEE80211_DISCARD_IE(vap, 1290 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1291 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1292 len, n); 1293 return IEEE80211_REASON_IE_INVALID; 1294 } 1295 w = 0; 1296 for (; n > 0; n--) { 1297 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1298 frm += 4, len -= 4; 1299 } 1300 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1301 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1302 else 1303 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1304 1305 /* key management algorithms */ 1306 n = LE_READ_2(frm); 1307 frm += 2, len -= 2; 1308 if (len < n*4) { 1309 IEEE80211_DISCARD_IE(vap, 1310 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1311 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1312 len, n); 1313 return IEEE80211_REASON_IE_INVALID; 1314 } 1315 w = 0; 1316 for (; n > 0; n--) { 1317 w |= wpa_keymgmt(frm); 1318 frm += 4, len -= 4; 1319 } 1320 if (w & WPA_ASE_8021X_UNSPEC) 1321 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1322 else 1323 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1324 1325 if (len > 2) /* optional capabilities */ 1326 rsn->rsn_caps = LE_READ_2(frm); 1327 1328 return 0; 1329 } 1330 1331 /* 1332 * Convert an RSN cipher selector OUI to an internal 1333 * cipher algorithm. Where appropriate we also 1334 * record any key length. 1335 */ 1336 static int 1337 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1338 { 1339 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1340 uint32_t w = LE_READ_4(sel); 1341 1342 switch (w) { 1343 case RSN_SEL(RSN_CSE_NULL): 1344 return IEEE80211_CIPHER_NONE; 1345 case RSN_SEL(RSN_CSE_WEP40): 1346 if (keylen) 1347 *keylen = 40 / NBBY; 1348 return IEEE80211_CIPHER_WEP; 1349 case RSN_SEL(RSN_CSE_WEP104): 1350 if (keylen) 1351 *keylen = 104 / NBBY; 1352 return IEEE80211_CIPHER_WEP; 1353 case RSN_SEL(RSN_CSE_TKIP): 1354 return IEEE80211_CIPHER_TKIP; 1355 case RSN_SEL(RSN_CSE_CCMP): 1356 return IEEE80211_CIPHER_AES_CCM; 1357 case RSN_SEL(RSN_CSE_WRAP): 1358 return IEEE80211_CIPHER_AES_OCB; 1359 } 1360 return 32; /* NB: so 1<< is discarded */ 1361 #undef WPA_SEL 1362 } 1363 1364 /* 1365 * Convert an RSN key management/authentication algorithm 1366 * to an internal code. 1367 */ 1368 static int 1369 rsn_keymgmt(const uint8_t *sel) 1370 { 1371 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1372 uint32_t w = LE_READ_4(sel); 1373 1374 switch (w) { 1375 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1376 return RSN_ASE_8021X_UNSPEC; 1377 case RSN_SEL(RSN_ASE_8021X_PSK): 1378 return RSN_ASE_8021X_PSK; 1379 case RSN_SEL(RSN_ASE_NONE): 1380 return RSN_ASE_NONE; 1381 } 1382 return 0; /* NB: so is discarded */ 1383 #undef RSN_SEL 1384 } 1385 1386 /* 1387 * Parse a WPA/RSN information element to collect parameters 1388 * and validate the parameters against what has been 1389 * configured for the system. 1390 */ 1391 static int 1392 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1393 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1394 { 1395 uint8_t len = frm[1]; 1396 uint32_t w; 1397 int n; 1398 1399 /* 1400 * Check the length once for fixed parts: 1401 * version, mcast cipher, and 2 selector counts. 1402 * Other, variable-length data, must be checked separately. 1403 */ 1404 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1405 IEEE80211_DISCARD_IE(vap, 1406 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1407 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1408 return IEEE80211_REASON_IE_INVALID; 1409 } 1410 if (len < 10) { 1411 IEEE80211_DISCARD_IE(vap, 1412 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1413 wh, "RSN", "too short, len %u", len); 1414 return IEEE80211_REASON_IE_INVALID; 1415 } 1416 frm += 2; 1417 w = LE_READ_2(frm); 1418 if (w != RSN_VERSION) { 1419 IEEE80211_DISCARD_IE(vap, 1420 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1421 wh, "RSN", "bad version %u", w); 1422 return IEEE80211_REASON_IE_INVALID; 1423 } 1424 frm += 2, len -= 2; 1425 1426 memset(rsn, 0, sizeof(*rsn)); 1427 1428 /* multicast/group cipher */ 1429 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1430 frm += 4, len -= 4; 1431 1432 /* unicast ciphers */ 1433 n = LE_READ_2(frm); 1434 frm += 2, len -= 2; 1435 if (len < n*4+2) { 1436 IEEE80211_DISCARD_IE(vap, 1437 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1438 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1439 len, n); 1440 return IEEE80211_REASON_IE_INVALID; 1441 } 1442 w = 0; 1443 for (; n > 0; n--) { 1444 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1445 frm += 4, len -= 4; 1446 } 1447 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1448 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1449 else 1450 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1451 1452 /* key management algorithms */ 1453 n = LE_READ_2(frm); 1454 frm += 2, len -= 2; 1455 if (len < n*4) { 1456 IEEE80211_DISCARD_IE(vap, 1457 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1458 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1459 len, n); 1460 return IEEE80211_REASON_IE_INVALID; 1461 } 1462 w = 0; 1463 for (; n > 0; n--) { 1464 w |= rsn_keymgmt(frm); 1465 frm += 4, len -= 4; 1466 } 1467 if (w & RSN_ASE_8021X_UNSPEC) 1468 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1469 else 1470 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1471 1472 /* optional RSN capabilities */ 1473 if (len > 2) 1474 rsn->rsn_caps = LE_READ_2(frm); 1475 /* XXXPMKID */ 1476 1477 return 0; 1478 } 1479 1480 /* 1481 * WPA/802.11i assocation request processing. 1482 */ 1483 static int 1484 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1485 const struct ieee80211_frame *wh, const uint8_t *wpa, 1486 const uint8_t *rsn, uint16_t capinfo) 1487 { 1488 struct ieee80211vap *vap = ni->ni_vap; 1489 uint8_t reason; 1490 int badwparsn; 1491 1492 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1493 if (wpa == NULL && rsn == NULL) { 1494 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1495 /* 1496 * W-Fi Protected Setup (WPS) permits 1497 * clients to associate and pass EAPOL frames 1498 * to establish initial credentials. 1499 */ 1500 ni->ni_flags |= IEEE80211_NODE_WPS; 1501 return 1; 1502 } 1503 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1504 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1505 /* 1506 * Transitional Security Network. Permits clients 1507 * to associate and use WEP while WPA is configured. 1508 */ 1509 ni->ni_flags |= IEEE80211_NODE_TSN; 1510 return 1; 1511 } 1512 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1513 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1514 vap->iv_stats.is_rx_assoc_badwpaie++; 1515 reason = IEEE80211_REASON_IE_INVALID; 1516 goto bad; 1517 } 1518 /* assert right association security credentials */ 1519 badwparsn = 0; /* NB: to silence compiler */ 1520 switch (vap->iv_flags & IEEE80211_F_WPA) { 1521 case IEEE80211_F_WPA1: 1522 badwparsn = (wpa == NULL); 1523 break; 1524 case IEEE80211_F_WPA2: 1525 badwparsn = (rsn == NULL); 1526 break; 1527 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1528 badwparsn = (wpa == NULL && rsn == NULL); 1529 break; 1530 } 1531 if (badwparsn) { 1532 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1533 wh, NULL, 1534 "%s", "missing WPA/RSN IE in association request"); 1535 vap->iv_stats.is_rx_assoc_badwpaie++; 1536 reason = IEEE80211_REASON_IE_INVALID; 1537 goto bad; 1538 } 1539 /* 1540 * Parse WPA/RSN information element. 1541 */ 1542 if (wpa != NULL) 1543 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1544 else 1545 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1546 if (reason != 0) { 1547 /* XXX distinguish WPA/RSN? */ 1548 vap->iv_stats.is_rx_assoc_badwpaie++; 1549 goto bad; 1550 } 1551 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1552 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1553 wpa != NULL ? "WPA" : "RSN", 1554 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1555 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1556 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1557 1558 return 1; 1559 bad: 1560 ieee80211_node_deauth(ni, reason); 1561 return 0; 1562 } 1563 1564 /* XXX find a better place for definition */ 1565 struct l2_update_frame { 1566 struct ether_header eh; 1567 uint8_t dsap; 1568 uint8_t ssap; 1569 uint8_t control; 1570 uint8_t xid[3]; 1571 } __packed; 1572 1573 /* 1574 * Deliver a TGf L2UF frame on behalf of a station. 1575 * This primes any bridge when the station is roaming 1576 * between ap's on the same wired network. 1577 */ 1578 static void 1579 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1580 { 1581 struct ieee80211vap *vap = ni->ni_vap; 1582 struct ifnet *ifp = vap->iv_ifp; 1583 struct mbuf *m; 1584 struct l2_update_frame *l2uf; 1585 struct ether_header *eh; 1586 1587 m = m_gethdr(M_NOWAIT, MT_DATA); 1588 if (m == NULL) { 1589 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1590 "%s", "no mbuf for l2uf frame"); 1591 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1592 return; 1593 } 1594 l2uf = mtod(m, struct l2_update_frame *); 1595 eh = &l2uf->eh; 1596 /* dst: Broadcast address */ 1597 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1598 /* src: associated STA */ 1599 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1600 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1601 1602 l2uf->dsap = 0; 1603 l2uf->ssap = 0; 1604 l2uf->control = 0xf5; 1605 l2uf->xid[0] = 0x81; 1606 l2uf->xid[1] = 0x80; 1607 l2uf->xid[2] = 0x00; 1608 1609 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1610 hostap_deliver_data(vap, ni, m); 1611 } 1612 1613 static void 1614 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1615 int reassoc, int resp, const char *tag, int rate) 1616 { 1617 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1618 "deny %s request, %s rate set mismatch, rate/MCS %d", 1619 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1620 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1621 ieee80211_node_leave(ni); 1622 } 1623 1624 static void 1625 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1626 int reassoc, int resp, const char *tag, int capinfo) 1627 { 1628 struct ieee80211vap *vap = ni->ni_vap; 1629 1630 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1631 "deny %s request, %s mismatch 0x%x", 1632 reassoc ? "reassoc" : "assoc", tag, capinfo); 1633 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1634 ieee80211_node_leave(ni); 1635 vap->iv_stats.is_rx_assoc_capmismatch++; 1636 } 1637 1638 static void 1639 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1640 int reassoc, int resp) 1641 { 1642 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1643 "deny %s request, missing HT ie", reassoc ? "reassoc" : "assoc"); 1644 /* XXX no better code */ 1645 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1646 ieee80211_node_leave(ni); 1647 } 1648 1649 static void 1650 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1651 int algo, int seq, int status) 1652 { 1653 struct ieee80211vap *vap = ni->ni_vap; 1654 1655 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1656 wh, NULL, "unsupported alg %d", algo); 1657 vap->iv_stats.is_rx_auth_unsupported++; 1658 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1659 seq | (status << 16)); 1660 } 1661 1662 static __inline int 1663 ishtmixed(const uint8_t *ie) 1664 { 1665 const struct ieee80211_ie_htinfo *ht = 1666 (const struct ieee80211_ie_htinfo *) ie; 1667 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1668 IEEE80211_HTINFO_OPMODE_MIXED; 1669 } 1670 1671 static int 1672 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1673 { 1674 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1675 int i; 1676 1677 /* NB: the 11b clients we care about will not have xrates */ 1678 if (xrates != NULL || rates == NULL) 1679 return 0; 1680 for (i = 0; i < rates[1]; i++) { 1681 int r = rates[2+i] & IEEE80211_RATE_VAL; 1682 if (r > 2*11 || ((1<<r) & brates) == 0) 1683 return 0; 1684 } 1685 return 1; 1686 } 1687 1688 static void 1689 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1690 int subtype, int rssi, int nf) 1691 { 1692 struct ieee80211vap *vap = ni->ni_vap; 1693 struct ieee80211com *ic = ni->ni_ic; 1694 struct ieee80211_frame *wh; 1695 uint8_t *frm, *efrm, *sfrm; 1696 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1697 int reassoc, resp; 1698 uint8_t rate; 1699 1700 wh = mtod(m0, struct ieee80211_frame *); 1701 frm = (uint8_t *)&wh[1]; 1702 efrm = mtod(m0, uint8_t *) + m0->m_len; 1703 switch (subtype) { 1704 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1705 case IEEE80211_FC0_SUBTYPE_BEACON: { 1706 struct ieee80211_scanparams scan; 1707 /* 1708 * We process beacon/probe response frames when scanning; 1709 * otherwise we check beacon frames for overlapping non-ERP 1710 * BSS in 11g and/or overlapping legacy BSS when in HT. 1711 */ 1712 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1713 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1714 vap->iv_stats.is_rx_mgtdiscard++; 1715 return; 1716 } 1717 /* NB: accept off-channel frames */ 1718 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1719 return; 1720 /* 1721 * Count frame now that we know it's to be processed. 1722 */ 1723 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1724 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1725 IEEE80211_NODE_STAT(ni, rx_beacons); 1726 } else 1727 IEEE80211_NODE_STAT(ni, rx_proberesp); 1728 /* 1729 * If scanning, just pass information to the scan module. 1730 */ 1731 if (ic->ic_flags & IEEE80211_F_SCAN) { 1732 if (scan.status == 0 && /* NB: on channel */ 1733 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1734 /* 1735 * Actively scanning a channel marked passive; 1736 * send a probe request now that we know there 1737 * is 802.11 traffic present. 1738 * 1739 * XXX check if the beacon we recv'd gives 1740 * us what we need and suppress the probe req 1741 */ 1742 ieee80211_probe_curchan(vap, 1); 1743 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1744 } 1745 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1746 return; 1747 } 1748 /* 1749 * Check beacon for overlapping bss w/ non ERP stations. 1750 * If we detect one and protection is configured but not 1751 * enabled, enable it and start a timer that'll bring us 1752 * out if we stop seeing the bss. 1753 */ 1754 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1755 scan.status == 0 && /* NB: on-channel */ 1756 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1757 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1758 ic->ic_lastnonerp = ticks; 1759 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1760 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1761 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1762 IEEE80211_NOTE_FRAME(vap, 1763 IEEE80211_MSG_ASSOC, wh, 1764 "non-ERP present on channel %d " 1765 "(saw erp 0x%x from channel %d), " 1766 "enable use of protection", 1767 ic->ic_curchan->ic_ieee, 1768 scan.erp, scan.chan); 1769 ic->ic_flags |= IEEE80211_F_USEPROT; 1770 ieee80211_notify_erp(ic); 1771 } 1772 } 1773 /* 1774 * Check beacon for non-HT station on HT channel 1775 * and update HT BSS occupancy as appropriate. 1776 */ 1777 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1778 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1779 /* 1780 * Off control channel; only check frames 1781 * that come in the extension channel when 1782 * operating w/ HT40. 1783 */ 1784 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1785 break; 1786 if (scan.chan != ic->ic_curchan->ic_extieee) 1787 break; 1788 } 1789 if (scan.htinfo == NULL) { 1790 ieee80211_htprot_update(ic, 1791 IEEE80211_HTINFO_OPMODE_PROTOPT | 1792 IEEE80211_HTINFO_NONHT_PRESENT); 1793 } else if (ishtmixed(scan.htinfo)) { 1794 /* XXX? take NONHT_PRESENT from beacon? */ 1795 ieee80211_htprot_update(ic, 1796 IEEE80211_HTINFO_OPMODE_MIXED | 1797 IEEE80211_HTINFO_NONHT_PRESENT); 1798 } 1799 } 1800 break; 1801 } 1802 1803 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1804 if (vap->iv_state != IEEE80211_S_RUN) { 1805 vap->iv_stats.is_rx_mgtdiscard++; 1806 return; 1807 } 1808 /* 1809 * Consult the ACL policy module if setup. 1810 */ 1811 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1812 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1813 wh, NULL, "%s", "disallowed by ACL"); 1814 vap->iv_stats.is_rx_acl++; 1815 return; 1816 } 1817 /* 1818 * prreq frame format 1819 * [tlv] ssid 1820 * [tlv] supported rates 1821 * [tlv] extended supported rates 1822 */ 1823 ssid = rates = xrates = NULL; 1824 sfrm = frm; 1825 while (efrm - frm > 1) { 1826 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1827 switch (*frm) { 1828 case IEEE80211_ELEMID_SSID: 1829 ssid = frm; 1830 break; 1831 case IEEE80211_ELEMID_RATES: 1832 rates = frm; 1833 break; 1834 case IEEE80211_ELEMID_XRATES: 1835 xrates = frm; 1836 break; 1837 } 1838 frm += frm[1] + 2; 1839 } 1840 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1841 if (xrates != NULL) 1842 IEEE80211_VERIFY_ELEMENT(xrates, 1843 IEEE80211_RATE_MAXSIZE - rates[1], return); 1844 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1845 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1846 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1847 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1848 wh, NULL, 1849 "%s", "no ssid with ssid suppression enabled"); 1850 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1851 return; 1852 } 1853 1854 /* XXX find a better class or define it's own */ 1855 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1856 "%s", "recv probe req"); 1857 /* 1858 * Some legacy 11b clients cannot hack a complete 1859 * probe response frame. When the request includes 1860 * only a bare-bones rate set, communicate this to 1861 * the transmit side. 1862 */ 1863 ieee80211_send_proberesp(vap, wh->i_addr2, 1864 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1865 break; 1866 1867 case IEEE80211_FC0_SUBTYPE_AUTH: { 1868 uint16_t algo, seq, status; 1869 1870 if (vap->iv_state != IEEE80211_S_RUN) { 1871 vap->iv_stats.is_rx_mgtdiscard++; 1872 return; 1873 } 1874 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1875 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1876 wh, NULL, "%s", "wrong bssid"); 1877 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1878 return; 1879 } 1880 /* 1881 * auth frame format 1882 * [2] algorithm 1883 * [2] sequence 1884 * [2] status 1885 * [tlv*] challenge 1886 */ 1887 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1888 algo = le16toh(*(uint16_t *)frm); 1889 seq = le16toh(*(uint16_t *)(frm + 2)); 1890 status = le16toh(*(uint16_t *)(frm + 4)); 1891 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1892 "recv auth frame with algorithm %d seq %d", algo, seq); 1893 /* 1894 * Consult the ACL policy module if setup. 1895 */ 1896 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1897 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1898 wh, NULL, "%s", "disallowed by ACL"); 1899 vap->iv_stats.is_rx_acl++; 1900 ieee80211_send_error(ni, wh->i_addr2, 1901 IEEE80211_FC0_SUBTYPE_AUTH, 1902 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1903 return; 1904 } 1905 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1906 IEEE80211_DISCARD(vap, 1907 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1908 wh, NULL, "%s", "TKIP countermeasures enabled"); 1909 vap->iv_stats.is_rx_auth_countermeasures++; 1910 ieee80211_send_error(ni, wh->i_addr2, 1911 IEEE80211_FC0_SUBTYPE_AUTH, 1912 IEEE80211_REASON_MIC_FAILURE); 1913 return; 1914 } 1915 if (algo == IEEE80211_AUTH_ALG_SHARED) 1916 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1917 seq, status); 1918 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1919 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1920 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1921 authalgreject(ni, wh, algo, 1922 seq+1, IEEE80211_STATUS_ALG); 1923 return; 1924 } else { 1925 /* 1926 * We assume that an unknown algorithm is the result 1927 * of a decryption failure on a shared key auth frame; 1928 * return a status code appropriate for that instead 1929 * of IEEE80211_STATUS_ALG. 1930 * 1931 * NB: a seq# of 4 is intentional; the decrypted 1932 * frame likely has a bogus seq value. 1933 */ 1934 authalgreject(ni, wh, algo, 1935 4, IEEE80211_STATUS_CHALLENGE); 1936 return; 1937 } 1938 break; 1939 } 1940 1941 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1942 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1943 uint16_t capinfo, lintval; 1944 struct ieee80211_rsnparms rsnparms; 1945 1946 if (vap->iv_state != IEEE80211_S_RUN) { 1947 vap->iv_stats.is_rx_mgtdiscard++; 1948 return; 1949 } 1950 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1951 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1952 wh, NULL, "%s", "wrong bssid"); 1953 vap->iv_stats.is_rx_assoc_bss++; 1954 return; 1955 } 1956 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1957 reassoc = 1; 1958 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1959 } else { 1960 reassoc = 0; 1961 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1962 } 1963 if (ni == vap->iv_bss) { 1964 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1965 "deny %s request, sta not authenticated", 1966 reassoc ? "reassoc" : "assoc"); 1967 ieee80211_send_error(ni, wh->i_addr2, 1968 IEEE80211_FC0_SUBTYPE_DEAUTH, 1969 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1970 vap->iv_stats.is_rx_assoc_notauth++; 1971 return; 1972 } 1973 1974 /* 1975 * asreq frame format 1976 * [2] capability information 1977 * [2] listen interval 1978 * [6*] current AP address (reassoc only) 1979 * [tlv] ssid 1980 * [tlv] supported rates 1981 * [tlv] extended supported rates 1982 * [tlv] WPA or RSN 1983 * [tlv] HT capabilities 1984 * [tlv] Atheros capabilities 1985 */ 1986 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1987 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1988 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1989 if (reassoc) 1990 frm += 6; /* ignore current AP info */ 1991 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1992 sfrm = frm; 1993 while (efrm - frm > 1) { 1994 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1995 switch (*frm) { 1996 case IEEE80211_ELEMID_SSID: 1997 ssid = frm; 1998 break; 1999 case IEEE80211_ELEMID_RATES: 2000 rates = frm; 2001 break; 2002 case IEEE80211_ELEMID_XRATES: 2003 xrates = frm; 2004 break; 2005 case IEEE80211_ELEMID_RSN: 2006 rsn = frm; 2007 break; 2008 case IEEE80211_ELEMID_HTCAP: 2009 htcap = frm; 2010 break; 2011 case IEEE80211_ELEMID_VENDOR: 2012 if (iswpaoui(frm)) 2013 wpa = frm; 2014 else if (iswmeinfo(frm)) 2015 wme = frm; 2016 #ifdef IEEE80211_SUPPORT_SUPERG 2017 else if (isatherosoui(frm)) 2018 ath = frm; 2019 #endif 2020 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2021 if (ishtcapoui(frm) && htcap == NULL) 2022 htcap = frm; 2023 } 2024 break; 2025 } 2026 frm += frm[1] + 2; 2027 } 2028 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2029 if (xrates != NULL) 2030 IEEE80211_VERIFY_ELEMENT(xrates, 2031 IEEE80211_RATE_MAXSIZE - rates[1], return); 2032 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2033 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2034 if (htcap != NULL) { 2035 IEEE80211_VERIFY_LENGTH(htcap[1], 2036 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2037 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2038 sizeof(struct ieee80211_ie_htcap)-2, 2039 return); /* XXX just NULL out? */ 2040 } 2041 2042 if ((vap->iv_flags & IEEE80211_F_WPA) && 2043 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2044 return; 2045 /* discard challenge after association */ 2046 if (ni->ni_challenge != NULL) { 2047 kfree(ni->ni_challenge, M_80211_NODE); 2048 ni->ni_challenge = NULL; 2049 } 2050 /* NB: 802.11 spec says to ignore station's privacy bit */ 2051 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2052 capinfomismatch(ni, wh, reassoc, resp, 2053 "capability", capinfo); 2054 return; 2055 } 2056 /* 2057 * Disallow re-associate w/ invalid slot time setting. 2058 */ 2059 if (ni->ni_associd != 0 && 2060 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2061 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2062 capinfomismatch(ni, wh, reassoc, resp, 2063 "slot time", capinfo); 2064 return; 2065 } 2066 rate = ieee80211_setup_rates(ni, rates, xrates, 2067 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2068 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2069 if (rate & IEEE80211_RATE_BASIC) { 2070 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2071 vap->iv_stats.is_rx_assoc_norate++; 2072 return; 2073 } 2074 /* 2075 * If constrained to 11g-only stations reject an 2076 * 11b-only station. We cheat a bit here by looking 2077 * at the max negotiated xmit rate and assuming anyone 2078 * with a best rate <24Mb/s is an 11b station. 2079 */ 2080 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2081 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2082 vap->iv_stats.is_rx_assoc_norate++; 2083 return; 2084 } 2085 /* 2086 * Do HT rate set handling and setup HT node state. 2087 */ 2088 ni->ni_chan = vap->iv_bss->ni_chan; 2089 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2090 rate = ieee80211_setup_htrates(ni, htcap, 2091 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2092 IEEE80211_F_DOBRS); 2093 if (rate & IEEE80211_RATE_BASIC) { 2094 ratesetmismatch(ni, wh, reassoc, resp, 2095 "HT", rate); 2096 vap->iv_stats.is_ht_assoc_norate++; 2097 return; 2098 } 2099 ieee80211_ht_node_init(ni); 2100 ieee80211_ht_updatehtcap(ni, htcap); 2101 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2102 ieee80211_ht_node_cleanup(ni); 2103 #ifdef IEEE80211_SUPPORT_SUPERG 2104 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2105 ieee80211_ff_node_cleanup(ni); 2106 #endif 2107 /* 2108 * Allow AMPDU operation only with unencrypted traffic 2109 * or AES-CCM; the 11n spec only specifies these ciphers 2110 * so permitting any others is undefined and can lead 2111 * to interoperability problems. 2112 */ 2113 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2114 (((vap->iv_flags & IEEE80211_F_WPA) && 2115 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2116 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2117 IEEE80211_NOTE(vap, 2118 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2119 "disallow HT use because WEP or TKIP requested, " 2120 "capinfo 0x%x ucastcipher %d", capinfo, 2121 rsnparms.rsn_ucastcipher); 2122 ieee80211_ht_node_cleanup(ni); 2123 vap->iv_stats.is_ht_assoc_downgrade++; 2124 } 2125 /* 2126 * If constrained to 11n-only stations reject legacy stations. 2127 */ 2128 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2129 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2130 htcapmismatch(ni, wh, reassoc, resp); 2131 vap->iv_stats.is_ht_assoc_nohtcap++; 2132 return; 2133 } 2134 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2135 ni->ni_noise = nf; 2136 ni->ni_intval = lintval; 2137 ni->ni_capinfo = capinfo; 2138 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2139 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2140 /* 2141 * Store the IEs. 2142 * XXX maybe better to just expand 2143 */ 2144 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2145 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2146 if (wpa != NULL) 2147 setie(wpa_ie, wpa - sfrm); 2148 if (rsn != NULL) 2149 setie(rsn_ie, rsn - sfrm); 2150 if (htcap != NULL) 2151 setie(htcap_ie, htcap - sfrm); 2152 if (wme != NULL) { 2153 setie(wme_ie, wme - sfrm); 2154 /* 2155 * Mark node as capable of QoS. 2156 */ 2157 ni->ni_flags |= IEEE80211_NODE_QOS; 2158 } else 2159 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2160 #ifdef IEEE80211_SUPPORT_SUPERG 2161 if (ath != NULL) { 2162 setie(ath_ie, ath - sfrm); 2163 /* 2164 * Parse ATH station parameters. 2165 */ 2166 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2167 } else 2168 #endif 2169 ni->ni_ath_flags = 0; 2170 #undef setie 2171 } else { 2172 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2173 ni->ni_ath_flags = 0; 2174 } 2175 ieee80211_node_join(ni, resp); 2176 ieee80211_deliver_l2uf(ni); 2177 break; 2178 } 2179 2180 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2181 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2182 uint16_t reason; 2183 2184 if (vap->iv_state != IEEE80211_S_RUN || 2185 /* NB: can happen when in promiscuous mode */ 2186 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2187 vap->iv_stats.is_rx_mgtdiscard++; 2188 break; 2189 } 2190 /* 2191 * deauth/disassoc frame format 2192 * [2] reason 2193 */ 2194 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2195 reason = le16toh(*(uint16_t *)frm); 2196 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2197 vap->iv_stats.is_rx_deauth++; 2198 IEEE80211_NODE_STAT(ni, rx_deauth); 2199 } else { 2200 vap->iv_stats.is_rx_disassoc++; 2201 IEEE80211_NODE_STAT(ni, rx_disassoc); 2202 } 2203 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2204 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2205 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2206 if (ni != vap->iv_bss) 2207 ieee80211_node_leave(ni); 2208 break; 2209 } 2210 2211 case IEEE80211_FC0_SUBTYPE_ACTION: 2212 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2213 if (ni == vap->iv_bss) { 2214 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2215 wh, NULL, "%s", "unknown node"); 2216 vap->iv_stats.is_rx_mgtdiscard++; 2217 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2218 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2219 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2220 wh, NULL, "%s", "not for us"); 2221 vap->iv_stats.is_rx_mgtdiscard++; 2222 } else if (vap->iv_state != IEEE80211_S_RUN) { 2223 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2224 wh, NULL, "wrong state %s", 2225 ieee80211_state_name[vap->iv_state]); 2226 vap->iv_stats.is_rx_mgtdiscard++; 2227 } else { 2228 if (ieee80211_parse_action(ni, m0) == 0) 2229 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2230 } 2231 break; 2232 2233 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2234 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2235 case IEEE80211_FC0_SUBTYPE_ATIM: 2236 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2237 wh, NULL, "%s", "not handled"); 2238 vap->iv_stats.is_rx_mgtdiscard++; 2239 break; 2240 2241 default: 2242 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2243 wh, "mgt", "subtype 0x%x not handled", subtype); 2244 vap->iv_stats.is_rx_badsubtype++; 2245 break; 2246 } 2247 } 2248 2249 static void 2250 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2251 { 2252 switch (subtype) { 2253 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2254 ni->ni_vap->iv_recv_pspoll(ni, m); 2255 break; 2256 case IEEE80211_FC0_SUBTYPE_BAR: 2257 ieee80211_recv_bar(ni, m); 2258 break; 2259 } 2260 } 2261 2262 /* 2263 * Process a received ps-poll frame. 2264 */ 2265 void 2266 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2267 { 2268 struct ieee80211vap *vap = ni->ni_vap; 2269 struct ieee80211com *ic = vap->iv_ic; 2270 struct ieee80211_frame_min *wh; 2271 struct mbuf *m; 2272 uint16_t aid; 2273 int qlen; 2274 2275 wh = mtod(m0, struct ieee80211_frame_min *); 2276 if (ni->ni_associd == 0) { 2277 IEEE80211_DISCARD(vap, 2278 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2279 (struct ieee80211_frame *) wh, NULL, 2280 "%s", "unassociated station"); 2281 vap->iv_stats.is_ps_unassoc++; 2282 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2283 IEEE80211_REASON_NOT_ASSOCED); 2284 return; 2285 } 2286 2287 aid = le16toh(*(uint16_t *)wh->i_dur); 2288 if (aid != ni->ni_associd) { 2289 IEEE80211_DISCARD(vap, 2290 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2291 (struct ieee80211_frame *) wh, NULL, 2292 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2293 ni->ni_associd, aid); 2294 vap->iv_stats.is_ps_badaid++; 2295 /* 2296 * NB: We used to deauth the station but it turns out 2297 * the Blackberry Curve 8230 (and perhaps other devices) 2298 * sometimes send the wrong AID when WME is negotiated. 2299 * Being more lenient here seems ok as we already check 2300 * the station is associated and we only return frames 2301 * queued for the station (i.e. we don't use the AID). 2302 */ 2303 return; 2304 } 2305 2306 /* Okay, take the first queued packet and put it out... */ 2307 m = ieee80211_node_psq_dequeue(ni, &qlen); 2308 if (m == NULL) { 2309 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2310 "%s", "recv ps-poll, but queue empty"); 2311 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2312 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2313 if (vap->iv_set_tim != NULL) 2314 vap->iv_set_tim(ni, 0); /* just in case */ 2315 return; 2316 } 2317 /* 2318 * If there are more packets, set the more packets bit 2319 * in the packet dispatched to the station; otherwise 2320 * turn off the TIM bit. 2321 */ 2322 if (qlen != 0) { 2323 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2324 "recv ps-poll, send packet, %u still queued", qlen); 2325 m->m_flags |= M_MORE_DATA; 2326 } else { 2327 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2328 "%s", "recv ps-poll, send packet, queue empty"); 2329 if (vap->iv_set_tim != NULL) 2330 vap->iv_set_tim(ni, 0); 2331 } 2332 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2333 2334 /* 2335 * Do the right thing; if it's an encap'ed frame then 2336 * call ieee80211_parent_xmitpkt() (and free the ref) else 2337 * call ieee80211_vap_xmitpkt(). 2338 */ 2339 if (m->m_flags & M_ENCAP) { 2340 if (ieee80211_parent_xmitpkt(ic, m) != 0) 2341 ieee80211_free_node(ni); 2342 } else { 2343 (void) ieee80211_vap_xmitpkt(vap, m); 2344 } 2345 } 2346