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 (void) ieee80211_vap_xmitpkt(vap, mcopy); 417 } 418 if (m != NULL) { 419 /* 420 * Mark frame as coming from vap's interface. 421 */ 422 m->m_pkthdr.rcvif = ifp; 423 if (m->m_flags & M_MCAST) { 424 /* 425 * Spam DWDS vap's w/ multicast traffic. 426 */ 427 /* XXX only if dwds in use? */ 428 ieee80211_dwds_mcast(vap, m); 429 } 430 if (ni->ni_vlan != 0) { 431 /* attach vlan tag */ 432 m->m_pkthdr.ether_vtag = ni->ni_vlan; 433 m->m_flags |= M_VLANTAG; 434 } 435 ifp->if_input(ifp, m); 436 } 437 } 438 439 /* 440 * Decide if a received management frame should be 441 * printed when debugging is enabled. This filters some 442 * of the less interesting frames that come frequently 443 * (e.g. beacons). 444 */ 445 static __inline int 446 doprint(struct ieee80211vap *vap, int subtype) 447 { 448 switch (subtype) { 449 case IEEE80211_FC0_SUBTYPE_BEACON: 450 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 451 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 452 return 0; 453 } 454 return 1; 455 } 456 457 /* 458 * Process a received frame. The node associated with the sender 459 * should be supplied. If nothing was found in the node table then 460 * the caller is assumed to supply a reference to iv_bss instead. 461 * The RSSI and a timestamp are also supplied. The RSSI data is used 462 * during AP scanning to select a AP to associate with; it can have 463 * any units so long as values have consistent units and higher values 464 * mean ``better signal''. The receive timestamp is currently not used 465 * by the 802.11 layer. 466 */ 467 static int 468 hostap_input(struct ieee80211_node *ni, struct mbuf *m, 469 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 470 { 471 struct ieee80211vap *vap = ni->ni_vap; 472 struct ieee80211com *ic = ni->ni_ic; 473 struct ifnet *ifp = vap->iv_ifp; 474 struct ieee80211_frame *wh; 475 struct ieee80211_key *key; 476 struct ether_header *eh; 477 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 478 uint8_t dir, type, subtype, qos; 479 uint8_t *bssid; 480 481 if (m->m_flags & M_AMPDU_MPDU) { 482 /* 483 * Fastpath for A-MPDU reorder q resubmission. Frames 484 * w/ M_AMPDU_MPDU marked have already passed through 485 * here but were received out of order and been held on 486 * the reorder queue. When resubmitted they are marked 487 * with the M_AMPDU_MPDU flag and we can bypass most of 488 * the normal processing. 489 */ 490 wh = mtod(m, struct ieee80211_frame *); 491 type = IEEE80211_FC0_TYPE_DATA; 492 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 493 subtype = IEEE80211_FC0_SUBTYPE_QOS; 494 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 495 goto resubmit_ampdu; 496 } 497 498 KASSERT(ni != NULL, ("null node")); 499 ni->ni_inact = ni->ni_inact_reload; 500 501 type = -1; /* undefined */ 502 503 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 504 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 505 ni->ni_macaddr, NULL, 506 "too short (1): len %u", m->m_pkthdr.len); 507 vap->iv_stats.is_rx_tooshort++; 508 goto out; 509 } 510 /* 511 * Bit of a cheat here, we use a pointer for a 3-address 512 * frame format but don't reference fields past outside 513 * ieee80211_frame_min w/o first validating the data is 514 * present. 515 */ 516 wh = mtod(m, struct ieee80211_frame *); 517 518 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 519 IEEE80211_FC0_VERSION_0) { 520 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 521 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 522 wh->i_fc[0], wh->i_fc[1]); 523 vap->iv_stats.is_rx_badversion++; 524 goto err; 525 } 526 527 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 528 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 529 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 530 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 531 if (dir != IEEE80211_FC1_DIR_NODS) 532 bssid = wh->i_addr1; 533 else if (type == IEEE80211_FC0_TYPE_CTL) 534 bssid = wh->i_addr1; 535 else { 536 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 537 IEEE80211_DISCARD_MAC(vap, 538 IEEE80211_MSG_ANY, ni->ni_macaddr, 539 NULL, "too short (2): len %u", 540 m->m_pkthdr.len); 541 vap->iv_stats.is_rx_tooshort++; 542 goto out; 543 } 544 bssid = wh->i_addr3; 545 } 546 /* 547 * Validate the bssid. 548 */ 549 if (!(type == IEEE80211_FC0_TYPE_MGT && 550 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 551 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 552 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 553 /* not interested in */ 554 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 555 bssid, NULL, "%s", "not to bss"); 556 vap->iv_stats.is_rx_wrongbss++; 557 goto out; 558 } 559 560 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 561 ni->ni_noise = nf; 562 if (IEEE80211_HAS_SEQ(type, subtype)) { 563 uint8_t tid = ieee80211_gettid(wh); 564 if (IEEE80211_QOS_HAS_SEQ(wh) && 565 TID_TO_WME_AC(tid) >= WME_AC_VI) 566 ic->ic_wme.wme_hipri_traffic++; 567 if (! ieee80211_check_rxseq(ni, wh, bssid)) 568 goto out; 569 } 570 } 571 572 switch (type) { 573 case IEEE80211_FC0_TYPE_DATA: 574 hdrspace = ieee80211_hdrspace(ic, wh); 575 if (m->m_len < hdrspace && 576 (m = m_pullup(m, hdrspace)) == NULL) { 577 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 578 ni->ni_macaddr, NULL, 579 "data too short: expecting %u", hdrspace); 580 vap->iv_stats.is_rx_tooshort++; 581 goto out; /* XXX */ 582 } 583 if (!(dir == IEEE80211_FC1_DIR_TODS || 584 (dir == IEEE80211_FC1_DIR_DSTODS && 585 (vap->iv_flags & IEEE80211_F_DWDS)))) { 586 if (dir != IEEE80211_FC1_DIR_DSTODS) { 587 IEEE80211_DISCARD(vap, 588 IEEE80211_MSG_INPUT, wh, "data", 589 "incorrect dir 0x%x", dir); 590 } else { 591 IEEE80211_DISCARD(vap, 592 IEEE80211_MSG_INPUT | 593 IEEE80211_MSG_WDS, wh, 594 "4-address data", 595 "%s", "DWDS not enabled"); 596 } 597 vap->iv_stats.is_rx_wrongdir++; 598 goto out; 599 } 600 /* check if source STA is associated */ 601 if (ni == vap->iv_bss) { 602 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 603 wh, "data", "%s", "unknown src"); 604 ieee80211_send_error(ni, wh->i_addr2, 605 IEEE80211_FC0_SUBTYPE_DEAUTH, 606 IEEE80211_REASON_NOT_AUTHED); 607 vap->iv_stats.is_rx_notassoc++; 608 goto err; 609 } 610 if (ni->ni_associd == 0) { 611 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 612 wh, "data", "%s", "unassoc src"); 613 IEEE80211_SEND_MGMT(ni, 614 IEEE80211_FC0_SUBTYPE_DISASSOC, 615 IEEE80211_REASON_NOT_ASSOCED); 616 vap->iv_stats.is_rx_notassoc++; 617 goto err; 618 } 619 620 /* 621 * Check for power save state change. 622 * XXX out-of-order A-MPDU frames? 623 */ 624 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 625 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 626 vap->iv_node_ps(ni, 627 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 628 /* 629 * For 4-address packets handle WDS discovery 630 * notifications. Once a WDS link is setup frames 631 * are just delivered to the WDS vap (see below). 632 */ 633 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 634 if (!ieee80211_node_is_authorized(ni)) { 635 IEEE80211_DISCARD(vap, 636 IEEE80211_MSG_INPUT | 637 IEEE80211_MSG_WDS, wh, 638 "4-address data", 639 "%s", "unauthorized port"); 640 vap->iv_stats.is_rx_unauth++; 641 IEEE80211_NODE_STAT(ni, rx_unauth); 642 goto err; 643 } 644 ieee80211_dwds_discover(ni, m); 645 return type; 646 } 647 648 /* 649 * Handle A-MPDU re-ordering. If the frame is to be 650 * processed directly then ieee80211_ampdu_reorder 651 * will return 0; otherwise it has consumed the mbuf 652 * and we should do nothing more with it. 653 */ 654 if ((m->m_flags & M_AMPDU) && 655 ieee80211_ampdu_reorder(ni, m) != 0) { 656 m = NULL; 657 goto out; 658 } 659 resubmit_ampdu: 660 661 /* 662 * Handle privacy requirements. Note that we 663 * must not be preempted from here until after 664 * we (potentially) call ieee80211_crypto_demic; 665 * otherwise we may violate assumptions in the 666 * crypto cipher modules used to do delayed update 667 * of replay sequence numbers. 668 */ 669 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 670 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 671 /* 672 * Discard encrypted frames when privacy is off. 673 */ 674 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 675 wh, "WEP", "%s", "PRIVACY off"); 676 vap->iv_stats.is_rx_noprivacy++; 677 IEEE80211_NODE_STAT(ni, rx_noprivacy); 678 goto out; 679 } 680 key = ieee80211_crypto_decap(ni, m, hdrspace); 681 if (key == NULL) { 682 /* NB: stats+msgs handled in crypto_decap */ 683 IEEE80211_NODE_STAT(ni, rx_wepfail); 684 goto out; 685 } 686 wh = mtod(m, struct ieee80211_frame *); 687 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 688 } else { 689 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 690 key = NULL; 691 } 692 693 /* 694 * Save QoS bits for use below--before we strip the header. 695 */ 696 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 697 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 698 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 699 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 700 } else 701 qos = 0; 702 703 /* 704 * Next up, any fragmentation. 705 */ 706 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 707 m = ieee80211_defrag(ni, m, hdrspace); 708 if (m == NULL) { 709 /* Fragment dropped or frame not complete yet */ 710 goto out; 711 } 712 } 713 wh = NULL; /* no longer valid, catch any uses */ 714 715 /* 716 * Next strip any MSDU crypto bits. 717 */ 718 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 719 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 720 ni->ni_macaddr, "data", "%s", "demic error"); 721 vap->iv_stats.is_rx_demicfail++; 722 IEEE80211_NODE_STAT(ni, rx_demicfail); 723 goto out; 724 } 725 /* copy to listener after decrypt */ 726 if (ieee80211_radiotap_active_vap(vap)) 727 ieee80211_radiotap_rx(vap, m); 728 need_tap = 0; 729 /* 730 * Finally, strip the 802.11 header. 731 */ 732 m = ieee80211_decap(vap, m, hdrspace); 733 if (m == NULL) { 734 /* XXX mask bit to check for both */ 735 /* don't count Null data frames as errors */ 736 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 737 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 738 goto out; 739 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 740 ni->ni_macaddr, "data", "%s", "decap error"); 741 vap->iv_stats.is_rx_decap++; 742 IEEE80211_NODE_STAT(ni, rx_decap); 743 goto err; 744 } 745 eh = mtod(m, struct ether_header *); 746 if (!ieee80211_node_is_authorized(ni)) { 747 /* 748 * Deny any non-PAE frames received prior to 749 * authorization. For open/shared-key 750 * authentication the port is mark authorized 751 * after authentication completes. For 802.1x 752 * the port is not marked authorized by the 753 * authenticator until the handshake has completed. 754 */ 755 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 756 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 757 eh->ether_shost, "data", 758 "unauthorized port: ether type 0x%x len %u", 759 eh->ether_type, m->m_pkthdr.len); 760 vap->iv_stats.is_rx_unauth++; 761 IEEE80211_NODE_STAT(ni, rx_unauth); 762 goto err; 763 } 764 } else { 765 /* 766 * When denying unencrypted frames, discard 767 * any non-PAE frames received without encryption. 768 */ 769 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 770 (key == NULL && (m->m_flags & M_WEP) == 0) && 771 eh->ether_type != htons(ETHERTYPE_PAE)) { 772 /* 773 * Drop unencrypted frames. 774 */ 775 vap->iv_stats.is_rx_unencrypted++; 776 IEEE80211_NODE_STAT(ni, rx_unencrypted); 777 goto out; 778 } 779 } 780 /* XXX require HT? */ 781 if (qos & IEEE80211_QOS_AMSDU) { 782 m = ieee80211_decap_amsdu(ni, m); 783 if (m == NULL) 784 return IEEE80211_FC0_TYPE_DATA; 785 } else { 786 #ifdef IEEE80211_SUPPORT_SUPERG 787 m = ieee80211_decap_fastframe(vap, ni, m); 788 if (m == NULL) 789 return IEEE80211_FC0_TYPE_DATA; 790 #endif 791 } 792 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 793 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 794 else 795 hostap_deliver_data(vap, ni, m); 796 return IEEE80211_FC0_TYPE_DATA; 797 798 case IEEE80211_FC0_TYPE_MGT: 799 vap->iv_stats.is_rx_mgmt++; 800 IEEE80211_NODE_STAT(ni, rx_mgmt); 801 if (dir != IEEE80211_FC1_DIR_NODS) { 802 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 803 wh, "mgt", "incorrect dir 0x%x", dir); 804 vap->iv_stats.is_rx_wrongdir++; 805 goto err; 806 } 807 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 808 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 809 ni->ni_macaddr, "mgt", "too short: len %u", 810 m->m_pkthdr.len); 811 vap->iv_stats.is_rx_tooshort++; 812 goto out; 813 } 814 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 815 /* ensure return frames are unicast */ 816 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 817 wh, NULL, "source is multicast: %s", 818 ether_sprintf(wh->i_addr2)); 819 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 820 goto out; 821 } 822 #ifdef IEEE80211_DEBUG 823 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 824 ieee80211_msg_dumppkts(vap)) { 825 if_printf(ifp, "received %s from %s rssi %d\n", 826 ieee80211_mgt_subtype_name(subtype), 827 ether_sprintf(wh->i_addr2), rssi); 828 } 829 #endif 830 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 831 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 832 /* 833 * Only shared key auth frames with a challenge 834 * should be encrypted, discard all others. 835 */ 836 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 837 wh, NULL, 838 "%s", "WEP set but not permitted"); 839 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 840 goto out; 841 } 842 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 843 /* 844 * Discard encrypted frames when privacy is off. 845 */ 846 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 847 wh, NULL, "%s", "WEP set but PRIVACY off"); 848 vap->iv_stats.is_rx_noprivacy++; 849 goto out; 850 } 851 hdrspace = ieee80211_hdrspace(ic, wh); 852 key = ieee80211_crypto_decap(ni, m, hdrspace); 853 if (key == NULL) { 854 /* NB: stats+msgs handled in crypto_decap */ 855 goto out; 856 } 857 wh = mtod(m, struct ieee80211_frame *); 858 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 859 } 860 /* 861 * Pass the packet to radiotap before calling iv_recv_mgmt(). 862 * Otherwise iv_recv_mgmt() might pass another packet to 863 * radiotap, resulting in out of order packet captures. 864 */ 865 if (ieee80211_radiotap_active_vap(vap)) 866 ieee80211_radiotap_rx(vap, m); 867 need_tap = 0; 868 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 869 goto out; 870 871 case IEEE80211_FC0_TYPE_CTL: 872 vap->iv_stats.is_rx_ctl++; 873 IEEE80211_NODE_STAT(ni, rx_ctrl); 874 vap->iv_recv_ctl(ni, m, subtype); 875 goto out; 876 default: 877 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 878 wh, "bad", "frame type 0x%x", type); 879 /* should not come here */ 880 break; 881 } 882 err: 883 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 884 out: 885 if (m != NULL) { 886 if (need_tap && ieee80211_radiotap_active_vap(vap)) 887 ieee80211_radiotap_rx(vap, m); 888 m_freem(m); 889 } 890 return type; 891 } 892 893 static void 894 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 895 int rssi, int nf, uint16_t seq, uint16_t status) 896 { 897 struct ieee80211vap *vap = ni->ni_vap; 898 899 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 900 901 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 902 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 903 ni->ni_macaddr, "open auth", 904 "bad sta auth mode %u", ni->ni_authmode); 905 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 906 /* 907 * Clear any challenge text that may be there if 908 * a previous shared key auth failed and then an 909 * open auth is attempted. 910 */ 911 if (ni->ni_challenge != NULL) { 912 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 913 ni->ni_challenge = NULL; 914 } 915 /* XXX hack to workaround calling convention */ 916 ieee80211_send_error(ni, wh->i_addr2, 917 IEEE80211_FC0_SUBTYPE_AUTH, 918 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 919 return; 920 } 921 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 922 vap->iv_stats.is_rx_bad_auth++; 923 return; 924 } 925 /* always accept open authentication requests */ 926 if (ni == vap->iv_bss) { 927 ni = ieee80211_dup_bss(vap, wh->i_addr2); 928 if (ni == NULL) 929 return; 930 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 931 (void) ieee80211_ref_node(ni); 932 /* 933 * Mark the node as referenced to reflect that it's 934 * reference count has been bumped to insure it remains 935 * after the transaction completes. 936 */ 937 ni->ni_flags |= IEEE80211_NODE_AREF; 938 /* 939 * Mark the node as requiring a valid association id 940 * before outbound traffic is permitted. 941 */ 942 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 943 944 if (vap->iv_acl != NULL && 945 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 946 /* 947 * When the ACL policy is set to RADIUS we defer the 948 * authorization to a user agent. Dispatch an event, 949 * a subsequent MLME call will decide the fate of the 950 * station. If the user agent is not present then the 951 * node will be reclaimed due to inactivity. 952 */ 953 IEEE80211_NOTE_MAC(vap, 954 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 955 "%s", "station authentication defered (radius acl)"); 956 ieee80211_notify_node_auth(ni); 957 } else { 958 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 959 IEEE80211_NOTE_MAC(vap, 960 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 961 "%s", "station authenticated (open)"); 962 /* 963 * When 802.1x is not in use mark the port 964 * authorized at this point so traffic can flow. 965 */ 966 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 967 ieee80211_node_authorize(ni); 968 } 969 } 970 971 static void 972 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 973 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 974 uint16_t seq, uint16_t status) 975 { 976 struct ieee80211vap *vap = ni->ni_vap; 977 uint8_t *challenge; 978 int allocbs, estatus; 979 980 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 981 982 /* 983 * NB: this can happen as we allow pre-shared key 984 * authentication to be enabled w/o wep being turned 985 * on so that configuration of these can be done 986 * in any order. It may be better to enforce the 987 * ordering in which case this check would just be 988 * for sanity/consistency. 989 */ 990 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 991 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 992 ni->ni_macaddr, "shared key auth", 993 "%s", " PRIVACY is disabled"); 994 estatus = IEEE80211_STATUS_ALG; 995 goto bad; 996 } 997 /* 998 * Pre-shared key authentication is evil; accept 999 * it only if explicitly configured (it is supported 1000 * mainly for compatibility with clients like Mac OS X). 1001 */ 1002 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1003 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1004 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1005 ni->ni_macaddr, "shared key auth", 1006 "bad sta auth mode %u", ni->ni_authmode); 1007 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1008 estatus = IEEE80211_STATUS_ALG; 1009 goto bad; 1010 } 1011 1012 challenge = NULL; 1013 if (frm + 1 < efrm) { 1014 if ((frm[1] + 2) > (efrm - frm)) { 1015 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1016 ni->ni_macaddr, "shared key auth", 1017 "ie %d/%d too long", 1018 frm[0], (frm[1] + 2) - (efrm - frm)); 1019 vap->iv_stats.is_rx_bad_auth++; 1020 estatus = IEEE80211_STATUS_CHALLENGE; 1021 goto bad; 1022 } 1023 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1024 challenge = frm; 1025 frm += frm[1] + 2; 1026 } 1027 switch (seq) { 1028 case IEEE80211_AUTH_SHARED_CHALLENGE: 1029 case IEEE80211_AUTH_SHARED_RESPONSE: 1030 if (challenge == NULL) { 1031 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1032 ni->ni_macaddr, "shared key auth", 1033 "%s", "no challenge"); 1034 vap->iv_stats.is_rx_bad_auth++; 1035 estatus = IEEE80211_STATUS_CHALLENGE; 1036 goto bad; 1037 } 1038 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1039 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1040 ni->ni_macaddr, "shared key auth", 1041 "bad challenge len %d", challenge[1]); 1042 vap->iv_stats.is_rx_bad_auth++; 1043 estatus = IEEE80211_STATUS_CHALLENGE; 1044 goto bad; 1045 } 1046 default: 1047 break; 1048 } 1049 switch (seq) { 1050 case IEEE80211_AUTH_SHARED_REQUEST: 1051 if (ni == vap->iv_bss) { 1052 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1053 if (ni == NULL) { 1054 /* NB: no way to return an error */ 1055 return; 1056 } 1057 allocbs = 1; 1058 } else { 1059 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1060 (void) ieee80211_ref_node(ni); 1061 allocbs = 0; 1062 } 1063 /* 1064 * Mark the node as referenced to reflect that it's 1065 * reference count has been bumped to insure it remains 1066 * after the transaction completes. 1067 */ 1068 ni->ni_flags |= IEEE80211_NODE_AREF; 1069 /* 1070 * Mark the node as requiring a valid association id 1071 * before outbound traffic is permitted. 1072 */ 1073 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1074 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1075 ni->ni_noise = nf; 1076 if (!ieee80211_alloc_challenge(ni)) { 1077 /* NB: don't return error so they rexmit */ 1078 return; 1079 } 1080 get_random_bytes(ni->ni_challenge, 1081 IEEE80211_CHALLENGE_LEN); 1082 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1083 ni, "shared key %sauth request", allocbs ? "" : "re"); 1084 /* 1085 * When the ACL policy is set to RADIUS we defer the 1086 * authorization to a user agent. Dispatch an event, 1087 * a subsequent MLME call will decide the fate of the 1088 * station. If the user agent is not present then the 1089 * node will be reclaimed due to inactivity. 1090 */ 1091 if (vap->iv_acl != NULL && 1092 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1093 IEEE80211_NOTE_MAC(vap, 1094 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1095 ni->ni_macaddr, 1096 "%s", "station authentication defered (radius acl)"); 1097 ieee80211_notify_node_auth(ni); 1098 return; 1099 } 1100 break; 1101 case IEEE80211_AUTH_SHARED_RESPONSE: 1102 if (ni == vap->iv_bss) { 1103 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1104 ni->ni_macaddr, "shared key response", 1105 "%s", "unknown station"); 1106 /* NB: don't send a response */ 1107 return; 1108 } 1109 if (ni->ni_challenge == NULL) { 1110 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1111 ni->ni_macaddr, "shared key response", 1112 "%s", "no challenge recorded"); 1113 vap->iv_stats.is_rx_bad_auth++; 1114 estatus = IEEE80211_STATUS_CHALLENGE; 1115 goto bad; 1116 } 1117 if (memcmp(ni->ni_challenge, &challenge[2], 1118 challenge[1]) != 0) { 1119 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1120 ni->ni_macaddr, "shared key response", 1121 "%s", "challenge mismatch"); 1122 vap->iv_stats.is_rx_auth_fail++; 1123 estatus = IEEE80211_STATUS_CHALLENGE; 1124 goto bad; 1125 } 1126 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1127 ni, "%s", "station authenticated (shared key)"); 1128 ieee80211_node_authorize(ni); 1129 break; 1130 default: 1131 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1132 ni->ni_macaddr, "shared key auth", 1133 "bad seq %d", seq); 1134 vap->iv_stats.is_rx_bad_auth++; 1135 estatus = IEEE80211_STATUS_SEQUENCE; 1136 goto bad; 1137 } 1138 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1139 return; 1140 bad: 1141 /* 1142 * Send an error response; but only when operating as an AP. 1143 */ 1144 /* XXX hack to workaround calling convention */ 1145 ieee80211_send_error(ni, wh->i_addr2, 1146 IEEE80211_FC0_SUBTYPE_AUTH, 1147 (seq + 1) | (estatus<<16)); 1148 } 1149 1150 /* 1151 * Convert a WPA cipher selector OUI to an internal 1152 * cipher algorithm. Where appropriate we also 1153 * record any key length. 1154 */ 1155 static int 1156 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1157 { 1158 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1159 uint32_t w = le32dec(sel); 1160 1161 switch (w) { 1162 case WPA_SEL(WPA_CSE_NULL): 1163 return IEEE80211_CIPHER_NONE; 1164 case WPA_SEL(WPA_CSE_WEP40): 1165 if (keylen) 1166 *keylen = 40 / NBBY; 1167 return IEEE80211_CIPHER_WEP; 1168 case WPA_SEL(WPA_CSE_WEP104): 1169 if (keylen) 1170 *keylen = 104 / NBBY; 1171 return IEEE80211_CIPHER_WEP; 1172 case WPA_SEL(WPA_CSE_TKIP): 1173 return IEEE80211_CIPHER_TKIP; 1174 case WPA_SEL(WPA_CSE_CCMP): 1175 return IEEE80211_CIPHER_AES_CCM; 1176 } 1177 return 32; /* NB: so 1<< is discarded */ 1178 #undef WPA_SEL 1179 } 1180 1181 /* 1182 * Convert a WPA key management/authentication algorithm 1183 * to an internal code. 1184 */ 1185 static int 1186 wpa_keymgmt(const uint8_t *sel) 1187 { 1188 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1189 uint32_t w = le32dec(sel); 1190 1191 switch (w) { 1192 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1193 return WPA_ASE_8021X_UNSPEC; 1194 case WPA_SEL(WPA_ASE_8021X_PSK): 1195 return WPA_ASE_8021X_PSK; 1196 case WPA_SEL(WPA_ASE_NONE): 1197 return WPA_ASE_NONE; 1198 } 1199 return 0; /* NB: so is discarded */ 1200 #undef WPA_SEL 1201 } 1202 1203 /* 1204 * Parse a WPA information element to collect parameters. 1205 * Note that we do not validate security parameters; that 1206 * is handled by the authenticator; the parsing done here 1207 * is just for internal use in making operational decisions. 1208 */ 1209 static int 1210 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1211 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1212 { 1213 uint8_t len = frm[1]; 1214 uint32_t w; 1215 int n; 1216 1217 /* 1218 * Check the length once for fixed parts: OUI, type, 1219 * version, mcast cipher, and 2 selector counts. 1220 * Other, variable-length data, must be checked separately. 1221 */ 1222 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1223 IEEE80211_DISCARD_IE(vap, 1224 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1225 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1226 return IEEE80211_REASON_IE_INVALID; 1227 } 1228 if (len < 14) { 1229 IEEE80211_DISCARD_IE(vap, 1230 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1231 wh, "WPA", "too short, len %u", len); 1232 return IEEE80211_REASON_IE_INVALID; 1233 } 1234 frm += 6, len -= 4; /* NB: len is payload only */ 1235 /* NB: iswpaoui already validated the OUI and type */ 1236 w = le16dec(frm); 1237 if (w != WPA_VERSION) { 1238 IEEE80211_DISCARD_IE(vap, 1239 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1240 wh, "WPA", "bad version %u", w); 1241 return IEEE80211_REASON_IE_INVALID; 1242 } 1243 frm += 2, len -= 2; 1244 1245 memset(rsn, 0, sizeof(*rsn)); 1246 1247 /* multicast/group cipher */ 1248 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1249 frm += 4, len -= 4; 1250 1251 /* unicast ciphers */ 1252 n = le16dec(frm); 1253 frm += 2, len -= 2; 1254 if (len < n*4+2) { 1255 IEEE80211_DISCARD_IE(vap, 1256 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1257 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1258 len, n); 1259 return IEEE80211_REASON_IE_INVALID; 1260 } 1261 w = 0; 1262 for (; n > 0; n--) { 1263 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1264 frm += 4, len -= 4; 1265 } 1266 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1267 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1268 else 1269 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1270 1271 /* key management algorithms */ 1272 n = le16dec(frm); 1273 frm += 2, len -= 2; 1274 if (len < n*4) { 1275 IEEE80211_DISCARD_IE(vap, 1276 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1277 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1278 len, n); 1279 return IEEE80211_REASON_IE_INVALID; 1280 } 1281 w = 0; 1282 for (; n > 0; n--) { 1283 w |= wpa_keymgmt(frm); 1284 frm += 4, len -= 4; 1285 } 1286 if (w & WPA_ASE_8021X_UNSPEC) 1287 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1288 else 1289 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1290 1291 if (len > 2) /* optional capabilities */ 1292 rsn->rsn_caps = le16dec(frm); 1293 1294 return 0; 1295 } 1296 1297 /* 1298 * Convert an RSN cipher selector OUI to an internal 1299 * cipher algorithm. Where appropriate we also 1300 * record any key length. 1301 */ 1302 static int 1303 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1304 { 1305 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1306 uint32_t w = le32dec(sel); 1307 1308 switch (w) { 1309 case RSN_SEL(RSN_CSE_NULL): 1310 return IEEE80211_CIPHER_NONE; 1311 case RSN_SEL(RSN_CSE_WEP40): 1312 if (keylen) 1313 *keylen = 40 / NBBY; 1314 return IEEE80211_CIPHER_WEP; 1315 case RSN_SEL(RSN_CSE_WEP104): 1316 if (keylen) 1317 *keylen = 104 / NBBY; 1318 return IEEE80211_CIPHER_WEP; 1319 case RSN_SEL(RSN_CSE_TKIP): 1320 return IEEE80211_CIPHER_TKIP; 1321 case RSN_SEL(RSN_CSE_CCMP): 1322 return IEEE80211_CIPHER_AES_CCM; 1323 case RSN_SEL(RSN_CSE_WRAP): 1324 return IEEE80211_CIPHER_AES_OCB; 1325 } 1326 return 32; /* NB: so 1<< is discarded */ 1327 #undef WPA_SEL 1328 } 1329 1330 /* 1331 * Convert an RSN key management/authentication algorithm 1332 * to an internal code. 1333 */ 1334 static int 1335 rsn_keymgmt(const uint8_t *sel) 1336 { 1337 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1338 uint32_t w = le32dec(sel); 1339 1340 switch (w) { 1341 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1342 return RSN_ASE_8021X_UNSPEC; 1343 case RSN_SEL(RSN_ASE_8021X_PSK): 1344 return RSN_ASE_8021X_PSK; 1345 case RSN_SEL(RSN_ASE_NONE): 1346 return RSN_ASE_NONE; 1347 } 1348 return 0; /* NB: so is discarded */ 1349 #undef RSN_SEL 1350 } 1351 1352 /* 1353 * Parse a WPA/RSN information element to collect parameters 1354 * and validate the parameters against what has been 1355 * configured for the system. 1356 */ 1357 static int 1358 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1359 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1360 { 1361 uint8_t len = frm[1]; 1362 uint32_t w; 1363 int n; 1364 1365 /* 1366 * Check the length once for fixed parts: 1367 * version, mcast cipher, and 2 selector counts. 1368 * Other, variable-length data, must be checked separately. 1369 */ 1370 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1371 IEEE80211_DISCARD_IE(vap, 1372 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1373 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1374 return IEEE80211_REASON_IE_INVALID; 1375 } 1376 if (len < 10) { 1377 IEEE80211_DISCARD_IE(vap, 1378 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1379 wh, "RSN", "too short, len %u", len); 1380 return IEEE80211_REASON_IE_INVALID; 1381 } 1382 frm += 2; 1383 w = le16dec(frm); 1384 if (w != RSN_VERSION) { 1385 IEEE80211_DISCARD_IE(vap, 1386 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1387 wh, "RSN", "bad version %u", w); 1388 return IEEE80211_REASON_IE_INVALID; 1389 } 1390 frm += 2, len -= 2; 1391 1392 memset(rsn, 0, sizeof(*rsn)); 1393 1394 /* multicast/group cipher */ 1395 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1396 frm += 4, len -= 4; 1397 1398 /* unicast ciphers */ 1399 n = le16dec(frm); 1400 frm += 2, len -= 2; 1401 if (len < n*4+2) { 1402 IEEE80211_DISCARD_IE(vap, 1403 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1404 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1405 len, n); 1406 return IEEE80211_REASON_IE_INVALID; 1407 } 1408 w = 0; 1409 for (; n > 0; n--) { 1410 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1411 frm += 4, len -= 4; 1412 } 1413 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1414 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1415 else 1416 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1417 1418 /* key management algorithms */ 1419 n = le16dec(frm); 1420 frm += 2, len -= 2; 1421 if (len < n*4) { 1422 IEEE80211_DISCARD_IE(vap, 1423 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1424 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1425 len, n); 1426 return IEEE80211_REASON_IE_INVALID; 1427 } 1428 w = 0; 1429 for (; n > 0; n--) { 1430 w |= rsn_keymgmt(frm); 1431 frm += 4, len -= 4; 1432 } 1433 if (w & RSN_ASE_8021X_UNSPEC) 1434 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1435 else 1436 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1437 1438 /* optional RSN capabilities */ 1439 if (len > 2) 1440 rsn->rsn_caps = le16dec(frm); 1441 /* XXXPMKID */ 1442 1443 return 0; 1444 } 1445 1446 /* 1447 * WPA/802.11i association request processing. 1448 */ 1449 static int 1450 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1451 const struct ieee80211_frame *wh, const uint8_t *wpa, 1452 const uint8_t *rsn, uint16_t capinfo) 1453 { 1454 struct ieee80211vap *vap = ni->ni_vap; 1455 uint8_t reason; 1456 int badwparsn; 1457 1458 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1459 if (wpa == NULL && rsn == NULL) { 1460 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1461 /* 1462 * W-Fi Protected Setup (WPS) permits 1463 * clients to associate and pass EAPOL frames 1464 * to establish initial credentials. 1465 */ 1466 ni->ni_flags |= IEEE80211_NODE_WPS; 1467 return 1; 1468 } 1469 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1470 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1471 /* 1472 * Transitional Security Network. Permits clients 1473 * to associate and use WEP while WPA is configured. 1474 */ 1475 ni->ni_flags |= IEEE80211_NODE_TSN; 1476 return 1; 1477 } 1478 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1479 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1480 vap->iv_stats.is_rx_assoc_badwpaie++; 1481 reason = IEEE80211_REASON_IE_INVALID; 1482 goto bad; 1483 } 1484 /* assert right association security credentials */ 1485 badwparsn = 0; /* NB: to silence compiler */ 1486 switch (vap->iv_flags & IEEE80211_F_WPA) { 1487 case IEEE80211_F_WPA1: 1488 badwparsn = (wpa == NULL); 1489 break; 1490 case IEEE80211_F_WPA2: 1491 badwparsn = (rsn == NULL); 1492 break; 1493 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1494 badwparsn = (wpa == NULL && rsn == NULL); 1495 break; 1496 } 1497 if (badwparsn) { 1498 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1499 wh, NULL, 1500 "%s", "missing WPA/RSN IE in association request"); 1501 vap->iv_stats.is_rx_assoc_badwpaie++; 1502 reason = IEEE80211_REASON_IE_INVALID; 1503 goto bad; 1504 } 1505 /* 1506 * Parse WPA/RSN information element. 1507 */ 1508 if (wpa != NULL) 1509 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1510 else 1511 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1512 if (reason != 0) { 1513 /* XXX distinguish WPA/RSN? */ 1514 vap->iv_stats.is_rx_assoc_badwpaie++; 1515 goto bad; 1516 } 1517 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1518 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1519 wpa != NULL ? "WPA" : "RSN", 1520 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1521 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1522 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1523 1524 return 1; 1525 bad: 1526 ieee80211_node_deauth(ni, reason); 1527 return 0; 1528 } 1529 1530 /* XXX find a better place for definition */ 1531 struct l2_update_frame { 1532 struct ether_header eh; 1533 uint8_t dsap; 1534 uint8_t ssap; 1535 uint8_t control; 1536 uint8_t xid[3]; 1537 } __packed; 1538 1539 /* 1540 * Deliver a TGf L2UF frame on behalf of a station. 1541 * This primes any bridge when the station is roaming 1542 * between ap's on the same wired network. 1543 */ 1544 static void 1545 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1546 { 1547 struct ieee80211vap *vap = ni->ni_vap; 1548 struct ifnet *ifp = vap->iv_ifp; 1549 struct mbuf *m; 1550 struct l2_update_frame *l2uf; 1551 struct ether_header *eh; 1552 1553 m = m_gethdr(M_NOWAIT, MT_DATA); 1554 if (m == NULL) { 1555 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1556 "%s", "no mbuf for l2uf frame"); 1557 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1558 return; 1559 } 1560 l2uf = mtod(m, struct l2_update_frame *); 1561 eh = &l2uf->eh; 1562 /* dst: Broadcast address */ 1563 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1564 /* src: associated STA */ 1565 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1566 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1567 1568 l2uf->dsap = 0; 1569 l2uf->ssap = 0; 1570 l2uf->control = 0xf5; 1571 l2uf->xid[0] = 0x81; 1572 l2uf->xid[1] = 0x80; 1573 l2uf->xid[2] = 0x00; 1574 1575 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1576 hostap_deliver_data(vap, ni, m); 1577 } 1578 1579 static void 1580 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1581 int reassoc, int resp, const char *tag, int rate) 1582 { 1583 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1584 "deny %s request, %s rate set mismatch, rate/MCS %d", 1585 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1586 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1587 ieee80211_node_leave(ni); 1588 } 1589 1590 static void 1591 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1592 int reassoc, int resp, const char *tag, int capinfo) 1593 { 1594 struct ieee80211vap *vap = ni->ni_vap; 1595 1596 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1597 "deny %s request, %s mismatch 0x%x", 1598 reassoc ? "reassoc" : "assoc", tag, capinfo); 1599 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1600 ieee80211_node_leave(ni); 1601 vap->iv_stats.is_rx_assoc_capmismatch++; 1602 } 1603 1604 static void 1605 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1606 int reassoc, int resp) 1607 { 1608 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1609 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1610 /* XXX no better code */ 1611 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1612 ieee80211_node_leave(ni); 1613 } 1614 1615 static void 1616 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1617 int algo, int seq, int status) 1618 { 1619 struct ieee80211vap *vap = ni->ni_vap; 1620 1621 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1622 wh, NULL, "unsupported alg %d", algo); 1623 vap->iv_stats.is_rx_auth_unsupported++; 1624 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1625 seq | (status << 16)); 1626 } 1627 1628 static __inline int 1629 ishtmixed(const uint8_t *ie) 1630 { 1631 const struct ieee80211_ie_htinfo *ht = 1632 (const struct ieee80211_ie_htinfo *) ie; 1633 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1634 IEEE80211_HTINFO_OPMODE_MIXED; 1635 } 1636 1637 static int 1638 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1639 { 1640 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1641 int i; 1642 1643 /* NB: the 11b clients we care about will not have xrates */ 1644 if (xrates != NULL || rates == NULL) 1645 return 0; 1646 for (i = 0; i < rates[1]; i++) { 1647 int r = rates[2+i] & IEEE80211_RATE_VAL; 1648 if (r > 2*11 || ((1<<r) & brates) == 0) 1649 return 0; 1650 } 1651 return 1; 1652 } 1653 1654 static void 1655 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1656 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1657 { 1658 struct ieee80211vap *vap = ni->ni_vap; 1659 struct ieee80211com *ic = ni->ni_ic; 1660 struct ieee80211_frame *wh; 1661 uint8_t *frm, *efrm, *sfrm; 1662 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1663 int reassoc, resp; 1664 uint8_t rate; 1665 1666 wh = mtod(m0, struct ieee80211_frame *); 1667 frm = (uint8_t *)&wh[1]; 1668 efrm = mtod(m0, uint8_t *) + m0->m_len; 1669 switch (subtype) { 1670 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1671 /* 1672 * We process beacon/probe response frames when scanning; 1673 * otherwise we check beacon frames for overlapping non-ERP 1674 * BSS in 11g and/or overlapping legacy BSS when in HT. 1675 */ 1676 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 1677 vap->iv_stats.is_rx_mgtdiscard++; 1678 return; 1679 } 1680 /* FALLTHROUGH */ 1681 case IEEE80211_FC0_SUBTYPE_BEACON: { 1682 struct ieee80211_scanparams scan; 1683 1684 /* NB: accept off-channel frames */ 1685 /* XXX TODO: use rxstatus to determine off-channel details */ 1686 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1687 return; 1688 /* 1689 * Count frame now that we know it's to be processed. 1690 */ 1691 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1692 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1693 IEEE80211_NODE_STAT(ni, rx_beacons); 1694 } else 1695 IEEE80211_NODE_STAT(ni, rx_proberesp); 1696 /* 1697 * If scanning, just pass information to the scan module. 1698 */ 1699 if (ic->ic_flags & IEEE80211_F_SCAN) { 1700 if (scan.status == 0 && /* NB: on channel */ 1701 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1702 /* 1703 * Actively scanning a channel marked passive; 1704 * send a probe request now that we know there 1705 * is 802.11 traffic present. 1706 * 1707 * XXX check if the beacon we recv'd gives 1708 * us what we need and suppress the probe req 1709 */ 1710 ieee80211_probe_curchan(vap, 1); 1711 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1712 } 1713 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh, 1714 subtype, rssi, nf); 1715 return; 1716 } 1717 /* 1718 * Check beacon for overlapping bss w/ non ERP stations. 1719 * If we detect one and protection is configured but not 1720 * enabled, enable it and start a timer that'll bring us 1721 * out if we stop seeing the bss. 1722 */ 1723 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1724 scan.status == 0 && /* NB: on-channel */ 1725 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1726 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1727 ic->ic_lastnonerp = ticks; 1728 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1729 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1730 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1731 IEEE80211_NOTE_FRAME(vap, 1732 IEEE80211_MSG_ASSOC, wh, 1733 "non-ERP present on channel %d " 1734 "(saw erp 0x%x from channel %d), " 1735 "enable use of protection", 1736 ic->ic_curchan->ic_ieee, 1737 scan.erp, scan.chan); 1738 ic->ic_flags |= IEEE80211_F_USEPROT; 1739 ieee80211_notify_erp(ic); 1740 } 1741 } 1742 /* 1743 * Check beacon for non-HT station on HT channel 1744 * and update HT BSS occupancy as appropriate. 1745 */ 1746 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1747 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1748 /* 1749 * Off control channel; only check frames 1750 * that come in the extension channel when 1751 * operating w/ HT40. 1752 */ 1753 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1754 break; 1755 if (scan.chan != ic->ic_curchan->ic_extieee) 1756 break; 1757 } 1758 if (scan.htinfo == NULL) { 1759 ieee80211_htprot_update(ic, 1760 IEEE80211_HTINFO_OPMODE_PROTOPT | 1761 IEEE80211_HTINFO_NONHT_PRESENT); 1762 } else if (ishtmixed(scan.htinfo)) { 1763 /* XXX? take NONHT_PRESENT from beacon? */ 1764 ieee80211_htprot_update(ic, 1765 IEEE80211_HTINFO_OPMODE_MIXED | 1766 IEEE80211_HTINFO_NONHT_PRESENT); 1767 } 1768 } 1769 break; 1770 } 1771 1772 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1773 if (vap->iv_state != IEEE80211_S_RUN) { 1774 vap->iv_stats.is_rx_mgtdiscard++; 1775 return; 1776 } 1777 /* 1778 * Consult the ACL policy module if setup. 1779 */ 1780 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1781 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1782 wh, NULL, "%s", "disallowed by ACL"); 1783 vap->iv_stats.is_rx_acl++; 1784 return; 1785 } 1786 /* 1787 * prreq frame format 1788 * [tlv] ssid 1789 * [tlv] supported rates 1790 * [tlv] extended supported rates 1791 */ 1792 ssid = rates = xrates = NULL; 1793 while (efrm - frm > 1) { 1794 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1795 switch (*frm) { 1796 case IEEE80211_ELEMID_SSID: 1797 ssid = frm; 1798 break; 1799 case IEEE80211_ELEMID_RATES: 1800 rates = frm; 1801 break; 1802 case IEEE80211_ELEMID_XRATES: 1803 xrates = frm; 1804 break; 1805 } 1806 frm += frm[1] + 2; 1807 } 1808 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1809 if (xrates != NULL) 1810 IEEE80211_VERIFY_ELEMENT(xrates, 1811 IEEE80211_RATE_MAXSIZE - rates[1], return); 1812 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1813 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1814 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1815 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1816 wh, NULL, 1817 "%s", "no ssid with ssid suppression enabled"); 1818 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1819 return; 1820 } 1821 1822 /* XXX find a better class or define it's own */ 1823 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1824 "%s", "recv probe req"); 1825 /* 1826 * Some legacy 11b clients cannot hack a complete 1827 * probe response frame. When the request includes 1828 * only a bare-bones rate set, communicate this to 1829 * the transmit side. 1830 */ 1831 ieee80211_send_proberesp(vap, wh->i_addr2, 1832 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1833 break; 1834 1835 case IEEE80211_FC0_SUBTYPE_AUTH: { 1836 uint16_t algo, seq, status; 1837 1838 if (vap->iv_state != IEEE80211_S_RUN) { 1839 vap->iv_stats.is_rx_mgtdiscard++; 1840 return; 1841 } 1842 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1843 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1844 wh, NULL, "%s", "wrong bssid"); 1845 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1846 return; 1847 } 1848 /* 1849 * auth frame format 1850 * [2] algorithm 1851 * [2] sequence 1852 * [2] status 1853 * [tlv*] challenge 1854 */ 1855 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1856 algo = le16toh(*(uint16_t *)frm); 1857 seq = le16toh(*(uint16_t *)(frm + 2)); 1858 status = le16toh(*(uint16_t *)(frm + 4)); 1859 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1860 "recv auth frame with algorithm %d seq %d", algo, seq); 1861 /* 1862 * Consult the ACL policy module if setup. 1863 */ 1864 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1865 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1866 wh, NULL, "%s", "disallowed by ACL"); 1867 vap->iv_stats.is_rx_acl++; 1868 ieee80211_send_error(ni, wh->i_addr2, 1869 IEEE80211_FC0_SUBTYPE_AUTH, 1870 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1871 return; 1872 } 1873 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1874 IEEE80211_DISCARD(vap, 1875 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1876 wh, NULL, "%s", "TKIP countermeasures enabled"); 1877 vap->iv_stats.is_rx_auth_countermeasures++; 1878 ieee80211_send_error(ni, wh->i_addr2, 1879 IEEE80211_FC0_SUBTYPE_AUTH, 1880 IEEE80211_REASON_MIC_FAILURE); 1881 return; 1882 } 1883 if (algo == IEEE80211_AUTH_ALG_SHARED) 1884 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1885 seq, status); 1886 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1887 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1888 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1889 authalgreject(ni, wh, algo, 1890 seq+1, IEEE80211_STATUS_ALG); 1891 return; 1892 } else { 1893 /* 1894 * We assume that an unknown algorithm is the result 1895 * of a decryption failure on a shared key auth frame; 1896 * return a status code appropriate for that instead 1897 * of IEEE80211_STATUS_ALG. 1898 * 1899 * NB: a seq# of 4 is intentional; the decrypted 1900 * frame likely has a bogus seq value. 1901 */ 1902 authalgreject(ni, wh, algo, 1903 4, IEEE80211_STATUS_CHALLENGE); 1904 return; 1905 } 1906 break; 1907 } 1908 1909 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1910 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1911 uint16_t capinfo, lintval; 1912 struct ieee80211_rsnparms rsnparms; 1913 1914 if (vap->iv_state != IEEE80211_S_RUN) { 1915 vap->iv_stats.is_rx_mgtdiscard++; 1916 return; 1917 } 1918 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1919 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1920 wh, NULL, "%s", "wrong bssid"); 1921 vap->iv_stats.is_rx_assoc_bss++; 1922 return; 1923 } 1924 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1925 reassoc = 1; 1926 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1927 } else { 1928 reassoc = 0; 1929 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1930 } 1931 if (ni == vap->iv_bss) { 1932 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1933 "deny %s request, sta not authenticated", 1934 reassoc ? "reassoc" : "assoc"); 1935 ieee80211_send_error(ni, wh->i_addr2, 1936 IEEE80211_FC0_SUBTYPE_DEAUTH, 1937 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1938 vap->iv_stats.is_rx_assoc_notauth++; 1939 return; 1940 } 1941 1942 /* 1943 * asreq frame format 1944 * [2] capability information 1945 * [2] listen interval 1946 * [6*] current AP address (reassoc only) 1947 * [tlv] ssid 1948 * [tlv] supported rates 1949 * [tlv] extended supported rates 1950 * [tlv] WPA or RSN 1951 * [tlv] HT capabilities 1952 * [tlv] Atheros capabilities 1953 */ 1954 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1955 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1956 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1957 if (reassoc) 1958 frm += 6; /* ignore current AP info */ 1959 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1960 sfrm = frm; 1961 while (efrm - frm > 1) { 1962 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1963 switch (*frm) { 1964 case IEEE80211_ELEMID_SSID: 1965 ssid = frm; 1966 break; 1967 case IEEE80211_ELEMID_RATES: 1968 rates = frm; 1969 break; 1970 case IEEE80211_ELEMID_XRATES: 1971 xrates = frm; 1972 break; 1973 case IEEE80211_ELEMID_RSN: 1974 rsn = frm; 1975 break; 1976 case IEEE80211_ELEMID_HTCAP: 1977 htcap = frm; 1978 break; 1979 case IEEE80211_ELEMID_VENDOR: 1980 if (iswpaoui(frm)) 1981 wpa = frm; 1982 else if (iswmeinfo(frm)) 1983 wme = frm; 1984 #ifdef IEEE80211_SUPPORT_SUPERG 1985 else if (isatherosoui(frm)) 1986 ath = frm; 1987 #endif 1988 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1989 if (ishtcapoui(frm) && htcap == NULL) 1990 htcap = frm; 1991 } 1992 break; 1993 } 1994 frm += frm[1] + 2; 1995 } 1996 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1997 if (xrates != NULL) 1998 IEEE80211_VERIFY_ELEMENT(xrates, 1999 IEEE80211_RATE_MAXSIZE - rates[1], return); 2000 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2001 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2002 if (htcap != NULL) { 2003 IEEE80211_VERIFY_LENGTH(htcap[1], 2004 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2005 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2006 sizeof(struct ieee80211_ie_htcap)-2, 2007 return); /* XXX just NULL out? */ 2008 } 2009 2010 if ((vap->iv_flags & IEEE80211_F_WPA) && 2011 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2012 return; 2013 /* discard challenge after association */ 2014 if (ni->ni_challenge != NULL) { 2015 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 2016 ni->ni_challenge = NULL; 2017 } 2018 /* NB: 802.11 spec says to ignore station's privacy bit */ 2019 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2020 capinfomismatch(ni, wh, reassoc, resp, 2021 "capability", capinfo); 2022 return; 2023 } 2024 /* 2025 * Disallow re-associate w/ invalid slot time setting. 2026 */ 2027 if (ni->ni_associd != 0 && 2028 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2029 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2030 capinfomismatch(ni, wh, reassoc, resp, 2031 "slot time", capinfo); 2032 return; 2033 } 2034 rate = ieee80211_setup_rates(ni, rates, xrates, 2035 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2036 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2037 if (rate & IEEE80211_RATE_BASIC) { 2038 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2039 vap->iv_stats.is_rx_assoc_norate++; 2040 return; 2041 } 2042 /* 2043 * If constrained to 11g-only stations reject an 2044 * 11b-only station. We cheat a bit here by looking 2045 * at the max negotiated xmit rate and assuming anyone 2046 * with a best rate <24Mb/s is an 11b station. 2047 */ 2048 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2049 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2050 vap->iv_stats.is_rx_assoc_norate++; 2051 return; 2052 } 2053 /* 2054 * Do HT rate set handling and setup HT node state. 2055 */ 2056 ni->ni_chan = vap->iv_bss->ni_chan; 2057 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2058 rate = ieee80211_setup_htrates(ni, htcap, 2059 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2060 IEEE80211_F_DOBRS); 2061 if (rate & IEEE80211_RATE_BASIC) { 2062 ratesetmismatch(ni, wh, reassoc, resp, 2063 "HT", rate); 2064 vap->iv_stats.is_ht_assoc_norate++; 2065 return; 2066 } 2067 ieee80211_ht_node_init(ni); 2068 ieee80211_ht_updatehtcap(ni, htcap); 2069 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2070 ieee80211_ht_node_cleanup(ni); 2071 #ifdef IEEE80211_SUPPORT_SUPERG 2072 /* Always do ff node cleanup; for A-MSDU */ 2073 ieee80211_ff_node_cleanup(ni); 2074 #endif 2075 /* 2076 * Allow AMPDU operation only with unencrypted traffic 2077 * or AES-CCM; the 11n spec only specifies these ciphers 2078 * so permitting any others is undefined and can lead 2079 * to interoperability problems. 2080 */ 2081 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2082 (((vap->iv_flags & IEEE80211_F_WPA) && 2083 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2084 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2085 IEEE80211_NOTE(vap, 2086 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2087 "disallow HT use because WEP or TKIP requested, " 2088 "capinfo 0x%x ucastcipher %d", capinfo, 2089 rsnparms.rsn_ucastcipher); 2090 ieee80211_ht_node_cleanup(ni); 2091 #ifdef IEEE80211_SUPPORT_SUPERG 2092 /* Always do ff node cleanup; for A-MSDU */ 2093 ieee80211_ff_node_cleanup(ni); 2094 #endif 2095 vap->iv_stats.is_ht_assoc_downgrade++; 2096 } 2097 /* 2098 * If constrained to 11n-only stations reject legacy stations. 2099 */ 2100 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2101 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2102 htcapmismatch(ni, wh, reassoc, resp); 2103 vap->iv_stats.is_ht_assoc_nohtcap++; 2104 return; 2105 } 2106 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2107 ni->ni_noise = nf; 2108 ni->ni_intval = lintval; 2109 ni->ni_capinfo = capinfo; 2110 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2111 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2112 /* 2113 * Store the IEs. 2114 * XXX maybe better to just expand 2115 */ 2116 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2117 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2118 if (wpa != NULL) 2119 setie(wpa_ie, wpa - sfrm); 2120 if (rsn != NULL) 2121 setie(rsn_ie, rsn - sfrm); 2122 if (htcap != NULL) 2123 setie(htcap_ie, htcap - sfrm); 2124 if (wme != NULL) { 2125 setie(wme_ie, wme - sfrm); 2126 /* 2127 * Mark node as capable of QoS. 2128 */ 2129 ni->ni_flags |= IEEE80211_NODE_QOS; 2130 } else 2131 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2132 #ifdef IEEE80211_SUPPORT_SUPERG 2133 if (ath != NULL) { 2134 setie(ath_ie, ath - sfrm); 2135 /* 2136 * Parse ATH station parameters. 2137 */ 2138 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2139 } else 2140 #endif 2141 ni->ni_ath_flags = 0; 2142 #undef setie 2143 } else { 2144 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2145 ni->ni_ath_flags = 0; 2146 } 2147 ieee80211_node_join(ni, resp); 2148 ieee80211_deliver_l2uf(ni); 2149 break; 2150 } 2151 2152 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2153 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2154 uint16_t reason; 2155 2156 if (vap->iv_state != IEEE80211_S_RUN || 2157 /* NB: can happen when in promiscuous mode */ 2158 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2159 vap->iv_stats.is_rx_mgtdiscard++; 2160 break; 2161 } 2162 /* 2163 * deauth/disassoc frame format 2164 * [2] reason 2165 */ 2166 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2167 reason = le16toh(*(uint16_t *)frm); 2168 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2169 vap->iv_stats.is_rx_deauth++; 2170 IEEE80211_NODE_STAT(ni, rx_deauth); 2171 } else { 2172 vap->iv_stats.is_rx_disassoc++; 2173 IEEE80211_NODE_STAT(ni, rx_disassoc); 2174 } 2175 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2176 "recv %s (reason: %d (%s))", 2177 ieee80211_mgt_subtype_name(subtype), 2178 reason, ieee80211_reason_to_string(reason)); 2179 if (ni != vap->iv_bss) 2180 ieee80211_node_leave(ni); 2181 break; 2182 } 2183 2184 case IEEE80211_FC0_SUBTYPE_ACTION: 2185 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2186 if (ni == vap->iv_bss) { 2187 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2188 wh, NULL, "%s", "unknown node"); 2189 vap->iv_stats.is_rx_mgtdiscard++; 2190 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2191 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2192 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2193 wh, NULL, "%s", "not for us"); 2194 vap->iv_stats.is_rx_mgtdiscard++; 2195 } else if (vap->iv_state != IEEE80211_S_RUN) { 2196 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2197 wh, NULL, "wrong state %s", 2198 ieee80211_state_name[vap->iv_state]); 2199 vap->iv_stats.is_rx_mgtdiscard++; 2200 } else { 2201 if (ieee80211_parse_action(ni, m0) == 0) 2202 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2203 } 2204 break; 2205 2206 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2207 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2208 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 2209 case IEEE80211_FC0_SUBTYPE_ATIM: 2210 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2211 wh, NULL, "%s", "not handled"); 2212 vap->iv_stats.is_rx_mgtdiscard++; 2213 break; 2214 2215 default: 2216 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2217 wh, "mgt", "subtype 0x%x not handled", subtype); 2218 vap->iv_stats.is_rx_badsubtype++; 2219 break; 2220 } 2221 } 2222 2223 static void 2224 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2225 { 2226 switch (subtype) { 2227 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2228 ni->ni_vap->iv_recv_pspoll(ni, m); 2229 break; 2230 case IEEE80211_FC0_SUBTYPE_BAR: 2231 ieee80211_recv_bar(ni, m); 2232 break; 2233 } 2234 } 2235 2236 /* 2237 * Process a received ps-poll frame. 2238 */ 2239 void 2240 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2241 { 2242 struct ieee80211vap *vap = ni->ni_vap; 2243 struct ieee80211com *ic = vap->iv_ic; 2244 struct ieee80211_frame_min *wh; 2245 struct mbuf *m; 2246 uint16_t aid; 2247 int qlen; 2248 2249 wh = mtod(m0, struct ieee80211_frame_min *); 2250 if (ni->ni_associd == 0) { 2251 IEEE80211_DISCARD(vap, 2252 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2253 (struct ieee80211_frame *) wh, NULL, 2254 "%s", "unassociated station"); 2255 vap->iv_stats.is_ps_unassoc++; 2256 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2257 IEEE80211_REASON_NOT_ASSOCED); 2258 return; 2259 } 2260 2261 aid = le16toh(*(uint16_t *)wh->i_dur); 2262 if (aid != ni->ni_associd) { 2263 IEEE80211_DISCARD(vap, 2264 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2265 (struct ieee80211_frame *) wh, NULL, 2266 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2267 ni->ni_associd, aid); 2268 vap->iv_stats.is_ps_badaid++; 2269 /* 2270 * NB: We used to deauth the station but it turns out 2271 * the Blackberry Curve 8230 (and perhaps other devices) 2272 * sometimes send the wrong AID when WME is negotiated. 2273 * Being more lenient here seems ok as we already check 2274 * the station is associated and we only return frames 2275 * queued for the station (i.e. we don't use the AID). 2276 */ 2277 return; 2278 } 2279 2280 /* Okay, take the first queued packet and put it out... */ 2281 m = ieee80211_node_psq_dequeue(ni, &qlen); 2282 if (m == NULL) { 2283 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2284 "%s", "recv ps-poll, but queue empty"); 2285 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2286 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2287 if (vap->iv_set_tim != NULL) 2288 vap->iv_set_tim(ni, 0); /* just in case */ 2289 return; 2290 } 2291 /* 2292 * If there are more packets, set the more packets bit 2293 * in the packet dispatched to the station; otherwise 2294 * turn off the TIM bit. 2295 */ 2296 if (qlen != 0) { 2297 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2298 "recv ps-poll, send packet, %u still queued", qlen); 2299 m->m_flags |= M_MORE_DATA; 2300 } else { 2301 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2302 "%s", "recv ps-poll, send packet, queue empty"); 2303 if (vap->iv_set_tim != NULL) 2304 vap->iv_set_tim(ni, 0); 2305 } 2306 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2307 2308 /* 2309 * Do the right thing; if it's an encap'ed frame then 2310 * call ieee80211_parent_xmitpkt() else 2311 * call ieee80211_vap_xmitpkt(). 2312 */ 2313 if (m->m_flags & M_ENCAP) { 2314 (void) ieee80211_parent_xmitpkt(ic, m); 2315 } else { 2316 (void) ieee80211_vap_xmitpkt(vap, m); 2317 } 2318 } 2319