1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11 HOSTAP mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_media.h> 53 #include <net/if_llc.h> 54 #include <net/ethernet.h> 55 56 #include <net/bpf.h> 57 58 #include <net80211/ieee80211_var.h> 59 #include <net80211/ieee80211_hostap.h> 60 #include <net80211/ieee80211_input.h> 61 #ifdef IEEE80211_SUPPORT_SUPERG 62 #include <net80211/ieee80211_superg.h> 63 #endif 64 #include <net80211/ieee80211_wds.h> 65 66 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 67 68 static void hostap_vattach(struct ieee80211vap *); 69 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 71 const struct ieee80211_rx_stats *, 72 int rssi, int nf); 73 static void hostap_deliver_data(struct ieee80211vap *, 74 struct ieee80211_node *, struct mbuf *); 75 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf); 77 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 78 79 void 80 ieee80211_hostap_attach(struct ieee80211com *ic) 81 { 82 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 83 } 84 85 void 86 ieee80211_hostap_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 hostap_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 hostap_vattach(struct ieee80211vap *vap) 97 { 98 vap->iv_newstate = hostap_newstate; 99 vap->iv_input = hostap_input; 100 vap->iv_recv_mgmt = hostap_recv_mgmt; 101 vap->iv_recv_ctl = hostap_recv_ctl; 102 vap->iv_opdetach = hostap_vdetach; 103 vap->iv_deliver_data = hostap_deliver_data; 104 vap->iv_recv_pspoll = ieee80211_recv_pspoll; 105 } 106 107 static void 108 sta_disassoc(void *arg, struct ieee80211_node *ni) 109 { 110 struct ieee80211vap *vap = arg; 111 112 if (ni->ni_vap == vap && ni->ni_associd != 0) { 113 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 114 IEEE80211_REASON_ASSOC_LEAVE); 115 ieee80211_node_leave(ni); 116 } 117 } 118 119 static void 120 sta_csa(void *arg, struct ieee80211_node *ni) 121 { 122 struct ieee80211vap *vap = arg; 123 124 if (ni->ni_vap == vap && ni->ni_associd != 0) 125 if (ni->ni_inact > vap->iv_inact_init) { 126 ni->ni_inact = vap->iv_inact_init; 127 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 128 "%s: inact %u", __func__, ni->ni_inact); 129 } 130 } 131 132 static void 133 sta_drop(void *arg, struct ieee80211_node *ni) 134 { 135 struct ieee80211vap *vap = arg; 136 137 if (ni->ni_vap == vap && ni->ni_associd != 0) 138 ieee80211_node_leave(ni); 139 } 140 141 /* 142 * Does a channel change require associated stations to re-associate 143 * so protocol state is correct. This is used when doing CSA across 144 * bands or similar (e.g. HT -> legacy). 145 */ 146 static int 147 isbandchange(struct ieee80211com *ic) 148 { 149 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 150 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 151 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 152 } 153 154 /* 155 * IEEE80211_M_HOSTAP vap state machine handler. 156 */ 157 static int 158 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 159 { 160 struct ieee80211com *ic = vap->iv_ic; 161 enum ieee80211_state ostate; 162 163 IEEE80211_LOCK_ASSERT(ic); 164 165 ostate = vap->iv_state; 166 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 167 __func__, ieee80211_state_name[ostate], 168 ieee80211_state_name[nstate], arg); 169 vap->iv_state = nstate; /* state transition */ 170 if (ostate != IEEE80211_S_SCAN) 171 ieee80211_cancel_scan(vap); /* background scan */ 172 switch (nstate) { 173 case IEEE80211_S_INIT: 174 switch (ostate) { 175 case IEEE80211_S_SCAN: 176 ieee80211_cancel_scan(vap); 177 break; 178 case IEEE80211_S_CAC: 179 ieee80211_dfs_cac_stop(vap); 180 break; 181 case IEEE80211_S_RUN: 182 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 183 break; 184 default: 185 break; 186 } 187 if (ostate != IEEE80211_S_INIT) { 188 /* NB: optimize INIT -> INIT case */ 189 ieee80211_reset_bss(vap); 190 } 191 if (vap->iv_auth->ia_detach != NULL) 192 vap->iv_auth->ia_detach(vap); 193 break; 194 case IEEE80211_S_SCAN: 195 switch (ostate) { 196 case IEEE80211_S_CSA: 197 case IEEE80211_S_RUN: 198 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 199 /* 200 * Clear overlapping BSS state; the beacon frame 201 * will be reconstructed on transition to the RUN 202 * state and the timeout routines check if the flag 203 * is set before doing anything so this is sufficient. 204 */ 205 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 206 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 207 /* fall thru... */ 208 case IEEE80211_S_CAC: 209 /* 210 * NB: We may get here because of a manual channel 211 * change in which case we need to stop CAC 212 * XXX no need to stop if ostate RUN but it's ok 213 */ 214 ieee80211_dfs_cac_stop(vap); 215 /* fall thru... */ 216 case IEEE80211_S_INIT: 217 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 218 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 219 /* 220 * Already have a channel; bypass the 221 * scan and startup immediately. 222 * ieee80211_create_ibss will call back to 223 * move us to RUN state. 224 */ 225 ieee80211_create_ibss(vap, vap->iv_des_chan); 226 break; 227 } 228 /* 229 * Initiate a scan. We can come here as a result 230 * of an IEEE80211_IOC_SCAN_REQ too in which case 231 * the vap will be marked with IEEE80211_FEXT_SCANREQ 232 * and the scan request parameters will be present 233 * in iv_scanreq. Otherwise we do the default. 234 */ 235 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 236 ieee80211_check_scan(vap, 237 vap->iv_scanreq_flags, 238 vap->iv_scanreq_duration, 239 vap->iv_scanreq_mindwell, 240 vap->iv_scanreq_maxdwell, 241 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 242 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 243 } else 244 ieee80211_check_scan_current(vap); 245 break; 246 case IEEE80211_S_SCAN: 247 /* 248 * A state change requires a reset; scan. 249 */ 250 ieee80211_check_scan_current(vap); 251 break; 252 default: 253 break; 254 } 255 break; 256 case IEEE80211_S_CAC: 257 /* 258 * Start CAC on a DFS channel. We come here when starting 259 * a bss on a DFS channel (see ieee80211_create_ibss). 260 */ 261 ieee80211_dfs_cac_start(vap); 262 break; 263 case IEEE80211_S_RUN: 264 if (vap->iv_flags & IEEE80211_F_WPA) { 265 /* XXX validate prerequisites */ 266 } 267 switch (ostate) { 268 case IEEE80211_S_INIT: 269 /* 270 * Already have a channel; bypass the 271 * scan and startup immediately. 272 * Note that ieee80211_create_ibss will call 273 * back to do a RUN->RUN state change. 274 */ 275 ieee80211_create_ibss(vap, 276 ieee80211_ht_adjust_channel(ic, 277 ic->ic_curchan, vap->iv_flags_ht)); 278 /* NB: iv_bss is changed on return */ 279 break; 280 case IEEE80211_S_CAC: 281 /* 282 * NB: This is the normal state change when CAC 283 * expires and no radar was detected; no need to 284 * clear the CAC timer as it's already expired. 285 */ 286 /* fall thru... */ 287 case IEEE80211_S_CSA: 288 /* 289 * Shorten inactivity timer of associated stations 290 * to weed out sta's that don't follow a CSA. 291 */ 292 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 293 /* 294 * Update bss node channel to reflect where 295 * we landed after CSA. 296 */ 297 ieee80211_node_set_chan(vap->iv_bss, 298 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 299 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 300 /* XXX bypass debug msgs */ 301 break; 302 case IEEE80211_S_SCAN: 303 case IEEE80211_S_RUN: 304 #ifdef IEEE80211_DEBUG 305 if (ieee80211_msg_debug(vap)) { 306 struct ieee80211_node *ni = vap->iv_bss; 307 ieee80211_note(vap, 308 "synchronized with %s ssid ", 309 ether_sprintf(ni->ni_bssid)); 310 ieee80211_print_essid(ni->ni_essid, 311 ni->ni_esslen); 312 /* XXX MCS/HT */ 313 printf(" channel %d start %uMb\n", 314 ieee80211_chan2ieee(ic, ic->ic_curchan), 315 IEEE80211_RATE2MBS(ni->ni_txrate)); 316 } 317 #endif 318 break; 319 default: 320 break; 321 } 322 /* 323 * Start/stop the authenticator. We delay until here 324 * to allow configuration to happen out of order. 325 */ 326 if (vap->iv_auth->ia_attach != NULL) { 327 /* XXX check failure */ 328 vap->iv_auth->ia_attach(vap); 329 } else if (vap->iv_auth->ia_detach != NULL) { 330 vap->iv_auth->ia_detach(vap); 331 } 332 ieee80211_node_authorize(vap->iv_bss); 333 break; 334 case IEEE80211_S_CSA: 335 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 336 /* 337 * On a ``band change'' silently drop associated 338 * stations as they must re-associate before they 339 * can pass traffic (as otherwise protocol state 340 * such as capabilities and the negotiated rate 341 * set may/will be wrong). 342 */ 343 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 344 } 345 break; 346 default: 347 break; 348 } 349 return 0; 350 } 351 352 static void 353 hostap_deliver_data(struct ieee80211vap *vap, 354 struct ieee80211_node *ni, struct mbuf *m) 355 { 356 struct ether_header *eh = mtod(m, struct ether_header *); 357 struct ifnet *ifp = vap->iv_ifp; 358 359 /* clear driver/net80211 flags before passing up */ 360 m->m_flags &= ~(M_MCAST | M_BCAST); 361 m_clrprotoflags(m); 362 363 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 364 ("gack, opmode %d", vap->iv_opmode)); 365 /* 366 * Do accounting. 367 */ 368 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 369 IEEE80211_NODE_STAT(ni, rx_data); 370 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 371 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 372 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 373 IEEE80211_NODE_STAT(ni, rx_mcast); 374 } else 375 IEEE80211_NODE_STAT(ni, rx_ucast); 376 377 /* perform as a bridge within the AP */ 378 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 379 struct mbuf *mcopy = NULL; 380 381 if (m->m_flags & M_MCAST) { 382 mcopy = m_dup(m, M_NOWAIT); 383 if (mcopy == NULL) 384 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 385 else 386 mcopy->m_flags |= M_MCAST; 387 } else { 388 /* 389 * Check if the destination is associated with the 390 * same vap and authorized to receive traffic. 391 * Beware of traffic destined for the vap itself; 392 * sending it will not work; just let it be delivered 393 * normally. 394 */ 395 struct ieee80211_node *sta = ieee80211_find_vap_node( 396 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 397 if (sta != NULL) { 398 if (ieee80211_node_is_authorized(sta)) { 399 /* 400 * Beware of sending to ourself; this 401 * needs to happen via the normal 402 * input path. 403 */ 404 if (sta != vap->iv_bss) { 405 mcopy = m; 406 m = NULL; 407 } 408 } else { 409 vap->iv_stats.is_rx_unauth++; 410 IEEE80211_NODE_STAT(sta, rx_unauth); 411 } 412 ieee80211_free_node(sta); 413 } 414 } 415 if (mcopy != NULL) { 416 int len, err; 417 len = mcopy->m_pkthdr.len; 418 err = ieee80211_vap_xmitpkt(vap, mcopy); 419 if (err) { 420 /* NB: IFQ_HANDOFF reclaims mcopy */ 421 } else { 422 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 423 } 424 } 425 } 426 if (m != NULL) { 427 /* 428 * Mark frame as coming from vap's interface. 429 */ 430 m->m_pkthdr.rcvif = ifp; 431 if (m->m_flags & M_MCAST) { 432 /* 433 * Spam DWDS vap's w/ multicast traffic. 434 */ 435 /* XXX only if dwds in use? */ 436 ieee80211_dwds_mcast(vap, m); 437 } 438 if (ni->ni_vlan != 0) { 439 /* attach vlan tag */ 440 m->m_pkthdr.ether_vtag = ni->ni_vlan; 441 m->m_flags |= M_VLANTAG; 442 } 443 ifp->if_input(ifp, m); 444 } 445 } 446 447 /* 448 * Decide if a received management frame should be 449 * printed when debugging is enabled. This filters some 450 * of the less interesting frames that come frequently 451 * (e.g. beacons). 452 */ 453 static __inline int 454 doprint(struct ieee80211vap *vap, int subtype) 455 { 456 switch (subtype) { 457 case IEEE80211_FC0_SUBTYPE_BEACON: 458 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 459 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 460 return 0; 461 } 462 return 1; 463 } 464 465 /* 466 * Process a received frame. The node associated with the sender 467 * should be supplied. If nothing was found in the node table then 468 * the caller is assumed to supply a reference to iv_bss instead. 469 * The RSSI and a timestamp are also supplied. The RSSI data is used 470 * during AP scanning to select a AP to associate with; it can have 471 * any units so long as values have consistent units and higher values 472 * mean ``better signal''. The receive timestamp is currently not used 473 * by the 802.11 layer. 474 */ 475 static int 476 hostap_input(struct ieee80211_node *ni, struct mbuf *m, 477 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 478 { 479 struct ieee80211vap *vap = ni->ni_vap; 480 struct ieee80211com *ic = ni->ni_ic; 481 struct ifnet *ifp = vap->iv_ifp; 482 struct ieee80211_frame *wh; 483 struct ieee80211_key *key; 484 struct ether_header *eh; 485 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 486 uint8_t dir, type, subtype, qos; 487 uint8_t *bssid; 488 489 if (m->m_flags & M_AMPDU_MPDU) { 490 /* 491 * Fastpath for A-MPDU reorder q resubmission. Frames 492 * w/ M_AMPDU_MPDU marked have already passed through 493 * here but were received out of order and been held on 494 * the reorder queue. When resubmitted they are marked 495 * with the M_AMPDU_MPDU flag and we can bypass most of 496 * the normal processing. 497 */ 498 wh = mtod(m, struct ieee80211_frame *); 499 type = IEEE80211_FC0_TYPE_DATA; 500 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 501 subtype = IEEE80211_FC0_SUBTYPE_QOS; 502 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 503 goto resubmit_ampdu; 504 } 505 506 KASSERT(ni != NULL, ("null node")); 507 ni->ni_inact = ni->ni_inact_reload; 508 509 type = -1; /* undefined */ 510 511 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 512 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 513 ni->ni_macaddr, NULL, 514 "too short (1): len %u", m->m_pkthdr.len); 515 vap->iv_stats.is_rx_tooshort++; 516 goto out; 517 } 518 /* 519 * Bit of a cheat here, we use a pointer for a 3-address 520 * frame format but don't reference fields past outside 521 * ieee80211_frame_min w/o first validating the data is 522 * present. 523 */ 524 wh = mtod(m, struct ieee80211_frame *); 525 526 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 527 IEEE80211_FC0_VERSION_0) { 528 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 529 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 530 wh->i_fc[0], wh->i_fc[1]); 531 vap->iv_stats.is_rx_badversion++; 532 goto err; 533 } 534 535 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 536 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 537 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 538 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 539 if (dir != IEEE80211_FC1_DIR_NODS) 540 bssid = wh->i_addr1; 541 else if (type == IEEE80211_FC0_TYPE_CTL) 542 bssid = wh->i_addr1; 543 else { 544 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 545 IEEE80211_DISCARD_MAC(vap, 546 IEEE80211_MSG_ANY, ni->ni_macaddr, 547 NULL, "too short (2): len %u", 548 m->m_pkthdr.len); 549 vap->iv_stats.is_rx_tooshort++; 550 goto out; 551 } 552 bssid = wh->i_addr3; 553 } 554 /* 555 * Validate the bssid. 556 */ 557 if (!(type == IEEE80211_FC0_TYPE_MGT && 558 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 559 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 560 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 561 /* not interested in */ 562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 563 bssid, NULL, "%s", "not to bss"); 564 vap->iv_stats.is_rx_wrongbss++; 565 goto out; 566 } 567 568 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 569 ni->ni_noise = nf; 570 if (IEEE80211_HAS_SEQ(type, subtype)) { 571 uint8_t tid = ieee80211_gettid(wh); 572 if (IEEE80211_QOS_HAS_SEQ(wh) && 573 TID_TO_WME_AC(tid) >= WME_AC_VI) 574 ic->ic_wme.wme_hipri_traffic++; 575 if (! ieee80211_check_rxseq(ni, wh, bssid)) 576 goto out; 577 } 578 } 579 580 switch (type) { 581 case IEEE80211_FC0_TYPE_DATA: 582 hdrspace = ieee80211_hdrspace(ic, wh); 583 if (m->m_len < hdrspace && 584 (m = m_pullup(m, hdrspace)) == NULL) { 585 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 586 ni->ni_macaddr, NULL, 587 "data too short: expecting %u", hdrspace); 588 vap->iv_stats.is_rx_tooshort++; 589 goto out; /* XXX */ 590 } 591 if (!(dir == IEEE80211_FC1_DIR_TODS || 592 (dir == IEEE80211_FC1_DIR_DSTODS && 593 (vap->iv_flags & IEEE80211_F_DWDS)))) { 594 if (dir != IEEE80211_FC1_DIR_DSTODS) { 595 IEEE80211_DISCARD(vap, 596 IEEE80211_MSG_INPUT, wh, "data", 597 "incorrect dir 0x%x", dir); 598 } else { 599 IEEE80211_DISCARD(vap, 600 IEEE80211_MSG_INPUT | 601 IEEE80211_MSG_WDS, wh, 602 "4-address data", 603 "%s", "DWDS not enabled"); 604 } 605 vap->iv_stats.is_rx_wrongdir++; 606 goto out; 607 } 608 /* check if source STA is associated */ 609 if (ni == vap->iv_bss) { 610 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 611 wh, "data", "%s", "unknown src"); 612 ieee80211_send_error(ni, wh->i_addr2, 613 IEEE80211_FC0_SUBTYPE_DEAUTH, 614 IEEE80211_REASON_NOT_AUTHED); 615 vap->iv_stats.is_rx_notassoc++; 616 goto err; 617 } 618 if (ni->ni_associd == 0) { 619 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 620 wh, "data", "%s", "unassoc src"); 621 IEEE80211_SEND_MGMT(ni, 622 IEEE80211_FC0_SUBTYPE_DISASSOC, 623 IEEE80211_REASON_NOT_ASSOCED); 624 vap->iv_stats.is_rx_notassoc++; 625 goto err; 626 } 627 628 /* 629 * Check for power save state change. 630 * XXX out-of-order A-MPDU frames? 631 */ 632 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 633 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 634 vap->iv_node_ps(ni, 635 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 636 /* 637 * For 4-address packets handle WDS discovery 638 * notifications. Once a WDS link is setup frames 639 * are just delivered to the WDS vap (see below). 640 */ 641 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 642 if (!ieee80211_node_is_authorized(ni)) { 643 IEEE80211_DISCARD(vap, 644 IEEE80211_MSG_INPUT | 645 IEEE80211_MSG_WDS, wh, 646 "4-address data", 647 "%s", "unauthorized port"); 648 vap->iv_stats.is_rx_unauth++; 649 IEEE80211_NODE_STAT(ni, rx_unauth); 650 goto err; 651 } 652 ieee80211_dwds_discover(ni, m); 653 return type; 654 } 655 656 /* 657 * Handle A-MPDU re-ordering. If the frame is to be 658 * processed directly then ieee80211_ampdu_reorder 659 * will return 0; otherwise it has consumed the mbuf 660 * and we should do nothing more with it. 661 */ 662 if ((m->m_flags & M_AMPDU) && 663 ieee80211_ampdu_reorder(ni, m) != 0) { 664 m = NULL; 665 goto out; 666 } 667 resubmit_ampdu: 668 669 /* 670 * Handle privacy requirements. Note that we 671 * must not be preempted from here until after 672 * we (potentially) call ieee80211_crypto_demic; 673 * otherwise we may violate assumptions in the 674 * crypto cipher modules used to do delayed update 675 * of replay sequence numbers. 676 */ 677 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 678 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 679 /* 680 * Discard encrypted frames when privacy is off. 681 */ 682 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 683 wh, "WEP", "%s", "PRIVACY off"); 684 vap->iv_stats.is_rx_noprivacy++; 685 IEEE80211_NODE_STAT(ni, rx_noprivacy); 686 goto out; 687 } 688 key = ieee80211_crypto_decap(ni, m, hdrspace); 689 if (key == NULL) { 690 /* NB: stats+msgs handled in crypto_decap */ 691 IEEE80211_NODE_STAT(ni, rx_wepfail); 692 goto out; 693 } 694 wh = mtod(m, struct ieee80211_frame *); 695 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 696 } else { 697 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 698 key = NULL; 699 } 700 701 /* 702 * Save QoS bits for use below--before we strip the header. 703 */ 704 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 705 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 706 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 707 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 708 } else 709 qos = 0; 710 711 /* 712 * Next up, any fragmentation. 713 */ 714 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 715 m = ieee80211_defrag(ni, m, hdrspace); 716 if (m == NULL) { 717 /* Fragment dropped or frame not complete yet */ 718 goto out; 719 } 720 } 721 wh = NULL; /* no longer valid, catch any uses */ 722 723 /* 724 * Next strip any MSDU crypto bits. 725 */ 726 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 727 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 728 ni->ni_macaddr, "data", "%s", "demic error"); 729 vap->iv_stats.is_rx_demicfail++; 730 IEEE80211_NODE_STAT(ni, rx_demicfail); 731 goto out; 732 } 733 /* copy to listener after decrypt */ 734 if (ieee80211_radiotap_active_vap(vap)) 735 ieee80211_radiotap_rx(vap, m); 736 need_tap = 0; 737 /* 738 * Finally, strip the 802.11 header. 739 */ 740 m = ieee80211_decap(vap, m, hdrspace); 741 if (m == NULL) { 742 /* XXX mask bit to check for both */ 743 /* don't count Null data frames as errors */ 744 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 745 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 746 goto out; 747 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 748 ni->ni_macaddr, "data", "%s", "decap error"); 749 vap->iv_stats.is_rx_decap++; 750 IEEE80211_NODE_STAT(ni, rx_decap); 751 goto err; 752 } 753 eh = mtod(m, struct ether_header *); 754 if (!ieee80211_node_is_authorized(ni)) { 755 /* 756 * Deny any non-PAE frames received prior to 757 * authorization. For open/shared-key 758 * authentication the port is mark authorized 759 * after authentication completes. For 802.1x 760 * the port is not marked authorized by the 761 * authenticator until the handshake has completed. 762 */ 763 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 765 eh->ether_shost, "data", 766 "unauthorized port: ether type 0x%x len %u", 767 eh->ether_type, m->m_pkthdr.len); 768 vap->iv_stats.is_rx_unauth++; 769 IEEE80211_NODE_STAT(ni, rx_unauth); 770 goto err; 771 } 772 } else { 773 /* 774 * When denying unencrypted frames, discard 775 * any non-PAE frames received without encryption. 776 */ 777 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 778 (key == NULL && (m->m_flags & M_WEP) == 0) && 779 eh->ether_type != htons(ETHERTYPE_PAE)) { 780 /* 781 * Drop unencrypted frames. 782 */ 783 vap->iv_stats.is_rx_unencrypted++; 784 IEEE80211_NODE_STAT(ni, rx_unencrypted); 785 goto out; 786 } 787 } 788 /* XXX require HT? */ 789 if (qos & IEEE80211_QOS_AMSDU) { 790 m = ieee80211_decap_amsdu(ni, m); 791 if (m == NULL) 792 return IEEE80211_FC0_TYPE_DATA; 793 } else { 794 #ifdef IEEE80211_SUPPORT_SUPERG 795 m = ieee80211_decap_fastframe(vap, ni, m); 796 if (m == NULL) 797 return IEEE80211_FC0_TYPE_DATA; 798 #endif 799 } 800 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 801 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 802 else 803 hostap_deliver_data(vap, ni, m); 804 return IEEE80211_FC0_TYPE_DATA; 805 806 case IEEE80211_FC0_TYPE_MGT: 807 vap->iv_stats.is_rx_mgmt++; 808 IEEE80211_NODE_STAT(ni, rx_mgmt); 809 if (dir != IEEE80211_FC1_DIR_NODS) { 810 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 811 wh, "mgt", "incorrect dir 0x%x", dir); 812 vap->iv_stats.is_rx_wrongdir++; 813 goto err; 814 } 815 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 816 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 817 ni->ni_macaddr, "mgt", "too short: len %u", 818 m->m_pkthdr.len); 819 vap->iv_stats.is_rx_tooshort++; 820 goto out; 821 } 822 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 823 /* ensure return frames are unicast */ 824 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 825 wh, NULL, "source is multicast: %s", 826 ether_sprintf(wh->i_addr2)); 827 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 828 goto out; 829 } 830 #ifdef IEEE80211_DEBUG 831 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 832 ieee80211_msg_dumppkts(vap)) { 833 if_printf(ifp, "received %s from %s rssi %d\n", 834 ieee80211_mgt_subtype_name[subtype >> 835 IEEE80211_FC0_SUBTYPE_SHIFT], 836 ether_sprintf(wh->i_addr2), rssi); 837 } 838 #endif 839 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 840 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 841 /* 842 * Only shared key auth frames with a challenge 843 * should be encrypted, discard all others. 844 */ 845 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 846 wh, NULL, 847 "%s", "WEP set but not permitted"); 848 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 849 goto out; 850 } 851 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 852 /* 853 * Discard encrypted frames when privacy is off. 854 */ 855 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 856 wh, NULL, "%s", "WEP set but PRIVACY off"); 857 vap->iv_stats.is_rx_noprivacy++; 858 goto out; 859 } 860 hdrspace = ieee80211_hdrspace(ic, wh); 861 key = ieee80211_crypto_decap(ni, m, hdrspace); 862 if (key == NULL) { 863 /* NB: stats+msgs handled in crypto_decap */ 864 goto out; 865 } 866 wh = mtod(m, struct ieee80211_frame *); 867 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 868 } 869 /* 870 * Pass the packet to radiotap before calling iv_recv_mgmt(). 871 * Otherwise iv_recv_mgmt() might pass another packet to 872 * radiotap, resulting in out of order packet captures. 873 */ 874 if (ieee80211_radiotap_active_vap(vap)) 875 ieee80211_radiotap_rx(vap, m); 876 need_tap = 0; 877 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 878 goto out; 879 880 case IEEE80211_FC0_TYPE_CTL: 881 vap->iv_stats.is_rx_ctl++; 882 IEEE80211_NODE_STAT(ni, rx_ctrl); 883 vap->iv_recv_ctl(ni, m, subtype); 884 goto out; 885 default: 886 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 887 wh, "bad", "frame type 0x%x", type); 888 /* should not come here */ 889 break; 890 } 891 err: 892 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 893 out: 894 if (m != NULL) { 895 if (need_tap && ieee80211_radiotap_active_vap(vap)) 896 ieee80211_radiotap_rx(vap, m); 897 m_freem(m); 898 } 899 return type; 900 } 901 902 static void 903 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 904 int rssi, int nf, uint16_t seq, uint16_t status) 905 { 906 struct ieee80211vap *vap = ni->ni_vap; 907 908 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 909 910 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 911 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 912 ni->ni_macaddr, "open auth", 913 "bad sta auth mode %u", ni->ni_authmode); 914 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 915 /* 916 * Clear any challenge text that may be there if 917 * a previous shared key auth failed and then an 918 * open auth is attempted. 919 */ 920 if (ni->ni_challenge != NULL) { 921 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 922 ni->ni_challenge = NULL; 923 } 924 /* XXX hack to workaround calling convention */ 925 ieee80211_send_error(ni, wh->i_addr2, 926 IEEE80211_FC0_SUBTYPE_AUTH, 927 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 928 return; 929 } 930 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 931 vap->iv_stats.is_rx_bad_auth++; 932 return; 933 } 934 /* always accept open authentication requests */ 935 if (ni == vap->iv_bss) { 936 ni = ieee80211_dup_bss(vap, wh->i_addr2); 937 if (ni == NULL) 938 return; 939 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 940 (void) ieee80211_ref_node(ni); 941 /* 942 * Mark the node as referenced to reflect that it's 943 * reference count has been bumped to insure it remains 944 * after the transaction completes. 945 */ 946 ni->ni_flags |= IEEE80211_NODE_AREF; 947 /* 948 * Mark the node as requiring a valid association id 949 * before outbound traffic is permitted. 950 */ 951 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 952 953 if (vap->iv_acl != NULL && 954 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 955 /* 956 * When the ACL policy is set to RADIUS we defer the 957 * authorization to a user agent. Dispatch an event, 958 * a subsequent MLME call will decide the fate of the 959 * station. If the user agent is not present then the 960 * node will be reclaimed due to inactivity. 961 */ 962 IEEE80211_NOTE_MAC(vap, 963 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 964 "%s", "station authentication defered (radius acl)"); 965 ieee80211_notify_node_auth(ni); 966 } else { 967 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 968 IEEE80211_NOTE_MAC(vap, 969 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 970 "%s", "station authenticated (open)"); 971 /* 972 * When 802.1x is not in use mark the port 973 * authorized at this point so traffic can flow. 974 */ 975 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 976 ieee80211_node_authorize(ni); 977 } 978 } 979 980 static void 981 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 982 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 983 uint16_t seq, uint16_t status) 984 { 985 struct ieee80211vap *vap = ni->ni_vap; 986 uint8_t *challenge; 987 int allocbs, estatus; 988 989 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 990 991 /* 992 * NB: this can happen as we allow pre-shared key 993 * authentication to be enabled w/o wep being turned 994 * on so that configuration of these can be done 995 * in any order. It may be better to enforce the 996 * ordering in which case this check would just be 997 * for sanity/consistency. 998 */ 999 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1000 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1001 ni->ni_macaddr, "shared key auth", 1002 "%s", " PRIVACY is disabled"); 1003 estatus = IEEE80211_STATUS_ALG; 1004 goto bad; 1005 } 1006 /* 1007 * Pre-shared key authentication is evil; accept 1008 * it only if explicitly configured (it is supported 1009 * mainly for compatibility with clients like Mac OS X). 1010 */ 1011 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1012 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1013 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1014 ni->ni_macaddr, "shared key auth", 1015 "bad sta auth mode %u", ni->ni_authmode); 1016 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1017 estatus = IEEE80211_STATUS_ALG; 1018 goto bad; 1019 } 1020 1021 challenge = NULL; 1022 if (frm + 1 < efrm) { 1023 if ((frm[1] + 2) > (efrm - frm)) { 1024 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1025 ni->ni_macaddr, "shared key auth", 1026 "ie %d/%d too long", 1027 frm[0], (frm[1] + 2) - (efrm - frm)); 1028 vap->iv_stats.is_rx_bad_auth++; 1029 estatus = IEEE80211_STATUS_CHALLENGE; 1030 goto bad; 1031 } 1032 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1033 challenge = frm; 1034 frm += frm[1] + 2; 1035 } 1036 switch (seq) { 1037 case IEEE80211_AUTH_SHARED_CHALLENGE: 1038 case IEEE80211_AUTH_SHARED_RESPONSE: 1039 if (challenge == NULL) { 1040 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1041 ni->ni_macaddr, "shared key auth", 1042 "%s", "no challenge"); 1043 vap->iv_stats.is_rx_bad_auth++; 1044 estatus = IEEE80211_STATUS_CHALLENGE; 1045 goto bad; 1046 } 1047 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1048 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1049 ni->ni_macaddr, "shared key auth", 1050 "bad challenge len %d", challenge[1]); 1051 vap->iv_stats.is_rx_bad_auth++; 1052 estatus = IEEE80211_STATUS_CHALLENGE; 1053 goto bad; 1054 } 1055 default: 1056 break; 1057 } 1058 switch (seq) { 1059 case IEEE80211_AUTH_SHARED_REQUEST: 1060 if (ni == vap->iv_bss) { 1061 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1062 if (ni == NULL) { 1063 /* NB: no way to return an error */ 1064 return; 1065 } 1066 allocbs = 1; 1067 } else { 1068 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1069 (void) ieee80211_ref_node(ni); 1070 allocbs = 0; 1071 } 1072 /* 1073 * Mark the node as referenced to reflect that it's 1074 * reference count has been bumped to insure it remains 1075 * after the transaction completes. 1076 */ 1077 ni->ni_flags |= IEEE80211_NODE_AREF; 1078 /* 1079 * Mark the node as requiring a valid associatio id 1080 * before outbound traffic is permitted. 1081 */ 1082 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1083 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1084 ni->ni_noise = nf; 1085 if (!ieee80211_alloc_challenge(ni)) { 1086 /* NB: don't return error so they rexmit */ 1087 return; 1088 } 1089 get_random_bytes(ni->ni_challenge, 1090 IEEE80211_CHALLENGE_LEN); 1091 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1092 ni, "shared key %sauth request", allocbs ? "" : "re"); 1093 /* 1094 * When the ACL policy is set to RADIUS we defer the 1095 * authorization to a user agent. Dispatch an event, 1096 * a subsequent MLME call will decide the fate of the 1097 * station. If the user agent is not present then the 1098 * node will be reclaimed due to inactivity. 1099 */ 1100 if (vap->iv_acl != NULL && 1101 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1102 IEEE80211_NOTE_MAC(vap, 1103 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1104 ni->ni_macaddr, 1105 "%s", "station authentication defered (radius acl)"); 1106 ieee80211_notify_node_auth(ni); 1107 return; 1108 } 1109 break; 1110 case IEEE80211_AUTH_SHARED_RESPONSE: 1111 if (ni == vap->iv_bss) { 1112 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1113 ni->ni_macaddr, "shared key response", 1114 "%s", "unknown station"); 1115 /* NB: don't send a response */ 1116 return; 1117 } 1118 if (ni->ni_challenge == NULL) { 1119 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1120 ni->ni_macaddr, "shared key response", 1121 "%s", "no challenge recorded"); 1122 vap->iv_stats.is_rx_bad_auth++; 1123 estatus = IEEE80211_STATUS_CHALLENGE; 1124 goto bad; 1125 } 1126 if (memcmp(ni->ni_challenge, &challenge[2], 1127 challenge[1]) != 0) { 1128 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1129 ni->ni_macaddr, "shared key response", 1130 "%s", "challenge mismatch"); 1131 vap->iv_stats.is_rx_auth_fail++; 1132 estatus = IEEE80211_STATUS_CHALLENGE; 1133 goto bad; 1134 } 1135 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1136 ni, "%s", "station authenticated (shared key)"); 1137 ieee80211_node_authorize(ni); 1138 break; 1139 default: 1140 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1141 ni->ni_macaddr, "shared key auth", 1142 "bad seq %d", seq); 1143 vap->iv_stats.is_rx_bad_auth++; 1144 estatus = IEEE80211_STATUS_SEQUENCE; 1145 goto bad; 1146 } 1147 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1148 return; 1149 bad: 1150 /* 1151 * Send an error response; but only when operating as an AP. 1152 */ 1153 /* XXX hack to workaround calling convention */ 1154 ieee80211_send_error(ni, wh->i_addr2, 1155 IEEE80211_FC0_SUBTYPE_AUTH, 1156 (seq + 1) | (estatus<<16)); 1157 } 1158 1159 /* 1160 * Convert a WPA cipher selector OUI to an internal 1161 * cipher algorithm. Where appropriate we also 1162 * record any key length. 1163 */ 1164 static int 1165 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1166 { 1167 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1168 uint32_t w = LE_READ_4(sel); 1169 1170 switch (w) { 1171 case WPA_SEL(WPA_CSE_NULL): 1172 return IEEE80211_CIPHER_NONE; 1173 case WPA_SEL(WPA_CSE_WEP40): 1174 if (keylen) 1175 *keylen = 40 / NBBY; 1176 return IEEE80211_CIPHER_WEP; 1177 case WPA_SEL(WPA_CSE_WEP104): 1178 if (keylen) 1179 *keylen = 104 / NBBY; 1180 return IEEE80211_CIPHER_WEP; 1181 case WPA_SEL(WPA_CSE_TKIP): 1182 return IEEE80211_CIPHER_TKIP; 1183 case WPA_SEL(WPA_CSE_CCMP): 1184 return IEEE80211_CIPHER_AES_CCM; 1185 } 1186 return 32; /* NB: so 1<< is discarded */ 1187 #undef WPA_SEL 1188 } 1189 1190 /* 1191 * Convert a WPA key management/authentication algorithm 1192 * to an internal code. 1193 */ 1194 static int 1195 wpa_keymgmt(const uint8_t *sel) 1196 { 1197 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1198 uint32_t w = LE_READ_4(sel); 1199 1200 switch (w) { 1201 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1202 return WPA_ASE_8021X_UNSPEC; 1203 case WPA_SEL(WPA_ASE_8021X_PSK): 1204 return WPA_ASE_8021X_PSK; 1205 case WPA_SEL(WPA_ASE_NONE): 1206 return WPA_ASE_NONE; 1207 } 1208 return 0; /* NB: so is discarded */ 1209 #undef WPA_SEL 1210 } 1211 1212 /* 1213 * Parse a WPA information element to collect parameters. 1214 * Note that we do not validate security parameters; that 1215 * is handled by the authenticator; the parsing done here 1216 * is just for internal use in making operational decisions. 1217 */ 1218 static int 1219 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1220 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1221 { 1222 uint8_t len = frm[1]; 1223 uint32_t w; 1224 int n; 1225 1226 /* 1227 * Check the length once for fixed parts: OUI, type, 1228 * version, mcast cipher, and 2 selector counts. 1229 * Other, variable-length data, must be checked separately. 1230 */ 1231 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1232 IEEE80211_DISCARD_IE(vap, 1233 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1234 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1235 return IEEE80211_REASON_IE_INVALID; 1236 } 1237 if (len < 14) { 1238 IEEE80211_DISCARD_IE(vap, 1239 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1240 wh, "WPA", "too short, len %u", len); 1241 return IEEE80211_REASON_IE_INVALID; 1242 } 1243 frm += 6, len -= 4; /* NB: len is payload only */ 1244 /* NB: iswpaoui already validated the OUI and type */ 1245 w = LE_READ_2(frm); 1246 if (w != WPA_VERSION) { 1247 IEEE80211_DISCARD_IE(vap, 1248 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1249 wh, "WPA", "bad version %u", w); 1250 return IEEE80211_REASON_IE_INVALID; 1251 } 1252 frm += 2, len -= 2; 1253 1254 memset(rsn, 0, sizeof(*rsn)); 1255 1256 /* multicast/group cipher */ 1257 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1258 frm += 4, len -= 4; 1259 1260 /* unicast ciphers */ 1261 n = LE_READ_2(frm); 1262 frm += 2, len -= 2; 1263 if (len < n*4+2) { 1264 IEEE80211_DISCARD_IE(vap, 1265 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1266 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1267 len, n); 1268 return IEEE80211_REASON_IE_INVALID; 1269 } 1270 w = 0; 1271 for (; n > 0; n--) { 1272 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1273 frm += 4, len -= 4; 1274 } 1275 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1276 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1277 else 1278 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1279 1280 /* key management algorithms */ 1281 n = LE_READ_2(frm); 1282 frm += 2, len -= 2; 1283 if (len < n*4) { 1284 IEEE80211_DISCARD_IE(vap, 1285 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1286 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1287 len, n); 1288 return IEEE80211_REASON_IE_INVALID; 1289 } 1290 w = 0; 1291 for (; n > 0; n--) { 1292 w |= wpa_keymgmt(frm); 1293 frm += 4, len -= 4; 1294 } 1295 if (w & WPA_ASE_8021X_UNSPEC) 1296 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1297 else 1298 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1299 1300 if (len > 2) /* optional capabilities */ 1301 rsn->rsn_caps = LE_READ_2(frm); 1302 1303 return 0; 1304 } 1305 1306 /* 1307 * Convert an RSN cipher selector OUI to an internal 1308 * cipher algorithm. Where appropriate we also 1309 * record any key length. 1310 */ 1311 static int 1312 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1313 { 1314 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1315 uint32_t w = LE_READ_4(sel); 1316 1317 switch (w) { 1318 case RSN_SEL(RSN_CSE_NULL): 1319 return IEEE80211_CIPHER_NONE; 1320 case RSN_SEL(RSN_CSE_WEP40): 1321 if (keylen) 1322 *keylen = 40 / NBBY; 1323 return IEEE80211_CIPHER_WEP; 1324 case RSN_SEL(RSN_CSE_WEP104): 1325 if (keylen) 1326 *keylen = 104 / NBBY; 1327 return IEEE80211_CIPHER_WEP; 1328 case RSN_SEL(RSN_CSE_TKIP): 1329 return IEEE80211_CIPHER_TKIP; 1330 case RSN_SEL(RSN_CSE_CCMP): 1331 return IEEE80211_CIPHER_AES_CCM; 1332 case RSN_SEL(RSN_CSE_WRAP): 1333 return IEEE80211_CIPHER_AES_OCB; 1334 } 1335 return 32; /* NB: so 1<< is discarded */ 1336 #undef WPA_SEL 1337 } 1338 1339 /* 1340 * Convert an RSN key management/authentication algorithm 1341 * to an internal code. 1342 */ 1343 static int 1344 rsn_keymgmt(const uint8_t *sel) 1345 { 1346 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1347 uint32_t w = LE_READ_4(sel); 1348 1349 switch (w) { 1350 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1351 return RSN_ASE_8021X_UNSPEC; 1352 case RSN_SEL(RSN_ASE_8021X_PSK): 1353 return RSN_ASE_8021X_PSK; 1354 case RSN_SEL(RSN_ASE_NONE): 1355 return RSN_ASE_NONE; 1356 } 1357 return 0; /* NB: so is discarded */ 1358 #undef RSN_SEL 1359 } 1360 1361 /* 1362 * Parse a WPA/RSN information element to collect parameters 1363 * and validate the parameters against what has been 1364 * configured for the system. 1365 */ 1366 static int 1367 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1368 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1369 { 1370 uint8_t len = frm[1]; 1371 uint32_t w; 1372 int n; 1373 1374 /* 1375 * Check the length once for fixed parts: 1376 * version, mcast cipher, and 2 selector counts. 1377 * Other, variable-length data, must be checked separately. 1378 */ 1379 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1380 IEEE80211_DISCARD_IE(vap, 1381 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1382 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1383 return IEEE80211_REASON_IE_INVALID; 1384 } 1385 if (len < 10) { 1386 IEEE80211_DISCARD_IE(vap, 1387 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1388 wh, "RSN", "too short, len %u", len); 1389 return IEEE80211_REASON_IE_INVALID; 1390 } 1391 frm += 2; 1392 w = LE_READ_2(frm); 1393 if (w != RSN_VERSION) { 1394 IEEE80211_DISCARD_IE(vap, 1395 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1396 wh, "RSN", "bad version %u", w); 1397 return IEEE80211_REASON_IE_INVALID; 1398 } 1399 frm += 2, len -= 2; 1400 1401 memset(rsn, 0, sizeof(*rsn)); 1402 1403 /* multicast/group cipher */ 1404 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1405 frm += 4, len -= 4; 1406 1407 /* unicast ciphers */ 1408 n = LE_READ_2(frm); 1409 frm += 2, len -= 2; 1410 if (len < n*4+2) { 1411 IEEE80211_DISCARD_IE(vap, 1412 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1413 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1414 len, n); 1415 return IEEE80211_REASON_IE_INVALID; 1416 } 1417 w = 0; 1418 for (; n > 0; n--) { 1419 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1420 frm += 4, len -= 4; 1421 } 1422 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1423 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1424 else 1425 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1426 1427 /* key management algorithms */ 1428 n = LE_READ_2(frm); 1429 frm += 2, len -= 2; 1430 if (len < n*4) { 1431 IEEE80211_DISCARD_IE(vap, 1432 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1433 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1434 len, n); 1435 return IEEE80211_REASON_IE_INVALID; 1436 } 1437 w = 0; 1438 for (; n > 0; n--) { 1439 w |= rsn_keymgmt(frm); 1440 frm += 4, len -= 4; 1441 } 1442 if (w & RSN_ASE_8021X_UNSPEC) 1443 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1444 else 1445 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1446 1447 /* optional RSN capabilities */ 1448 if (len > 2) 1449 rsn->rsn_caps = LE_READ_2(frm); 1450 /* XXXPMKID */ 1451 1452 return 0; 1453 } 1454 1455 /* 1456 * WPA/802.11i assocation request processing. 1457 */ 1458 static int 1459 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1460 const struct ieee80211_frame *wh, const uint8_t *wpa, 1461 const uint8_t *rsn, uint16_t capinfo) 1462 { 1463 struct ieee80211vap *vap = ni->ni_vap; 1464 uint8_t reason; 1465 int badwparsn; 1466 1467 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1468 if (wpa == NULL && rsn == NULL) { 1469 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1470 /* 1471 * W-Fi Protected Setup (WPS) permits 1472 * clients to associate and pass EAPOL frames 1473 * to establish initial credentials. 1474 */ 1475 ni->ni_flags |= IEEE80211_NODE_WPS; 1476 return 1; 1477 } 1478 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1479 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1480 /* 1481 * Transitional Security Network. Permits clients 1482 * to associate and use WEP while WPA is configured. 1483 */ 1484 ni->ni_flags |= IEEE80211_NODE_TSN; 1485 return 1; 1486 } 1487 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1488 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1489 vap->iv_stats.is_rx_assoc_badwpaie++; 1490 reason = IEEE80211_REASON_IE_INVALID; 1491 goto bad; 1492 } 1493 /* assert right association security credentials */ 1494 badwparsn = 0; /* NB: to silence compiler */ 1495 switch (vap->iv_flags & IEEE80211_F_WPA) { 1496 case IEEE80211_F_WPA1: 1497 badwparsn = (wpa == NULL); 1498 break; 1499 case IEEE80211_F_WPA2: 1500 badwparsn = (rsn == NULL); 1501 break; 1502 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1503 badwparsn = (wpa == NULL && rsn == NULL); 1504 break; 1505 } 1506 if (badwparsn) { 1507 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1508 wh, NULL, 1509 "%s", "missing WPA/RSN IE in association request"); 1510 vap->iv_stats.is_rx_assoc_badwpaie++; 1511 reason = IEEE80211_REASON_IE_INVALID; 1512 goto bad; 1513 } 1514 /* 1515 * Parse WPA/RSN information element. 1516 */ 1517 if (wpa != NULL) 1518 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1519 else 1520 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1521 if (reason != 0) { 1522 /* XXX distinguish WPA/RSN? */ 1523 vap->iv_stats.is_rx_assoc_badwpaie++; 1524 goto bad; 1525 } 1526 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1527 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1528 wpa != NULL ? "WPA" : "RSN", 1529 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1530 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1531 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1532 1533 return 1; 1534 bad: 1535 ieee80211_node_deauth(ni, reason); 1536 return 0; 1537 } 1538 1539 /* XXX find a better place for definition */ 1540 struct l2_update_frame { 1541 struct ether_header eh; 1542 uint8_t dsap; 1543 uint8_t ssap; 1544 uint8_t control; 1545 uint8_t xid[3]; 1546 } __packed; 1547 1548 /* 1549 * Deliver a TGf L2UF frame on behalf of a station. 1550 * This primes any bridge when the station is roaming 1551 * between ap's on the same wired network. 1552 */ 1553 static void 1554 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1555 { 1556 struct ieee80211vap *vap = ni->ni_vap; 1557 struct ifnet *ifp = vap->iv_ifp; 1558 struct mbuf *m; 1559 struct l2_update_frame *l2uf; 1560 struct ether_header *eh; 1561 1562 m = m_gethdr(M_NOWAIT, MT_DATA); 1563 if (m == NULL) { 1564 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1565 "%s", "no mbuf for l2uf frame"); 1566 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1567 return; 1568 } 1569 l2uf = mtod(m, struct l2_update_frame *); 1570 eh = &l2uf->eh; 1571 /* dst: Broadcast address */ 1572 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1573 /* src: associated STA */ 1574 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1575 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1576 1577 l2uf->dsap = 0; 1578 l2uf->ssap = 0; 1579 l2uf->control = 0xf5; 1580 l2uf->xid[0] = 0x81; 1581 l2uf->xid[1] = 0x80; 1582 l2uf->xid[2] = 0x00; 1583 1584 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1585 hostap_deliver_data(vap, ni, m); 1586 } 1587 1588 static void 1589 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1590 int reassoc, int resp, const char *tag, int rate) 1591 { 1592 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1593 "deny %s request, %s rate set mismatch, rate/MCS %d", 1594 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1595 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1596 ieee80211_node_leave(ni); 1597 } 1598 1599 static void 1600 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1601 int reassoc, int resp, const char *tag, int capinfo) 1602 { 1603 struct ieee80211vap *vap = ni->ni_vap; 1604 1605 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1606 "deny %s request, %s mismatch 0x%x", 1607 reassoc ? "reassoc" : "assoc", tag, capinfo); 1608 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1609 ieee80211_node_leave(ni); 1610 vap->iv_stats.is_rx_assoc_capmismatch++; 1611 } 1612 1613 static void 1614 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1615 int reassoc, int resp) 1616 { 1617 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1618 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1619 /* XXX no better code */ 1620 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1621 ieee80211_node_leave(ni); 1622 } 1623 1624 static void 1625 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1626 int algo, int seq, int status) 1627 { 1628 struct ieee80211vap *vap = ni->ni_vap; 1629 1630 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1631 wh, NULL, "unsupported alg %d", algo); 1632 vap->iv_stats.is_rx_auth_unsupported++; 1633 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1634 seq | (status << 16)); 1635 } 1636 1637 static __inline int 1638 ishtmixed(const uint8_t *ie) 1639 { 1640 const struct ieee80211_ie_htinfo *ht = 1641 (const struct ieee80211_ie_htinfo *) ie; 1642 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1643 IEEE80211_HTINFO_OPMODE_MIXED; 1644 } 1645 1646 static int 1647 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1648 { 1649 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1650 int i; 1651 1652 /* NB: the 11b clients we care about will not have xrates */ 1653 if (xrates != NULL || rates == NULL) 1654 return 0; 1655 for (i = 0; i < rates[1]; i++) { 1656 int r = rates[2+i] & IEEE80211_RATE_VAL; 1657 if (r > 2*11 || ((1<<r) & brates) == 0) 1658 return 0; 1659 } 1660 return 1; 1661 } 1662 1663 static void 1664 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1665 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1666 { 1667 struct ieee80211vap *vap = ni->ni_vap; 1668 struct ieee80211com *ic = ni->ni_ic; 1669 struct ieee80211_frame *wh; 1670 uint8_t *frm, *efrm, *sfrm; 1671 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1672 int reassoc, resp; 1673 uint8_t rate; 1674 1675 wh = mtod(m0, struct ieee80211_frame *); 1676 frm = (uint8_t *)&wh[1]; 1677 efrm = mtod(m0, uint8_t *) + m0->m_len; 1678 switch (subtype) { 1679 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1680 case IEEE80211_FC0_SUBTYPE_BEACON: { 1681 struct ieee80211_scanparams scan; 1682 /* 1683 * We process beacon/probe response frames when scanning; 1684 * otherwise we check beacon frames for overlapping non-ERP 1685 * BSS in 11g and/or overlapping legacy BSS when in HT. 1686 */ 1687 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1688 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1689 vap->iv_stats.is_rx_mgtdiscard++; 1690 return; 1691 } 1692 /* NB: accept off-channel frames */ 1693 /* XXX TODO: use rxstatus to determine off-channel details */ 1694 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1695 return; 1696 /* 1697 * Count frame now that we know it's to be processed. 1698 */ 1699 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1700 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1701 IEEE80211_NODE_STAT(ni, rx_beacons); 1702 } else 1703 IEEE80211_NODE_STAT(ni, rx_proberesp); 1704 /* 1705 * If scanning, just pass information to the scan module. 1706 */ 1707 if (ic->ic_flags & IEEE80211_F_SCAN) { 1708 if (scan.status == 0 && /* NB: on channel */ 1709 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1710 /* 1711 * Actively scanning a channel marked passive; 1712 * send a probe request now that we know there 1713 * is 802.11 traffic present. 1714 * 1715 * XXX check if the beacon we recv'd gives 1716 * us what we need and suppress the probe req 1717 */ 1718 ieee80211_probe_curchan(vap, 1); 1719 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1720 } 1721 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh, 1722 subtype, rssi, nf); 1723 return; 1724 } 1725 /* 1726 * Check beacon for overlapping bss w/ non ERP stations. 1727 * If we detect one and protection is configured but not 1728 * enabled, enable it and start a timer that'll bring us 1729 * out if we stop seeing the bss. 1730 */ 1731 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1732 scan.status == 0 && /* NB: on-channel */ 1733 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1734 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1735 ic->ic_lastnonerp = ticks; 1736 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1737 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1738 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1739 IEEE80211_NOTE_FRAME(vap, 1740 IEEE80211_MSG_ASSOC, wh, 1741 "non-ERP present on channel %d " 1742 "(saw erp 0x%x from channel %d), " 1743 "enable use of protection", 1744 ic->ic_curchan->ic_ieee, 1745 scan.erp, scan.chan); 1746 ic->ic_flags |= IEEE80211_F_USEPROT; 1747 ieee80211_notify_erp(ic); 1748 } 1749 } 1750 /* 1751 * Check beacon for non-HT station on HT channel 1752 * and update HT BSS occupancy as appropriate. 1753 */ 1754 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1755 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1756 /* 1757 * Off control channel; only check frames 1758 * that come in the extension channel when 1759 * operating w/ HT40. 1760 */ 1761 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1762 break; 1763 if (scan.chan != ic->ic_curchan->ic_extieee) 1764 break; 1765 } 1766 if (scan.htinfo == NULL) { 1767 ieee80211_htprot_update(ic, 1768 IEEE80211_HTINFO_OPMODE_PROTOPT | 1769 IEEE80211_HTINFO_NONHT_PRESENT); 1770 } else if (ishtmixed(scan.htinfo)) { 1771 /* XXX? take NONHT_PRESENT from beacon? */ 1772 ieee80211_htprot_update(ic, 1773 IEEE80211_HTINFO_OPMODE_MIXED | 1774 IEEE80211_HTINFO_NONHT_PRESENT); 1775 } 1776 } 1777 break; 1778 } 1779 1780 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1781 if (vap->iv_state != IEEE80211_S_RUN) { 1782 vap->iv_stats.is_rx_mgtdiscard++; 1783 return; 1784 } 1785 /* 1786 * Consult the ACL policy module if setup. 1787 */ 1788 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1789 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1790 wh, NULL, "%s", "disallowed by ACL"); 1791 vap->iv_stats.is_rx_acl++; 1792 return; 1793 } 1794 /* 1795 * prreq frame format 1796 * [tlv] ssid 1797 * [tlv] supported rates 1798 * [tlv] extended supported rates 1799 */ 1800 ssid = rates = xrates = NULL; 1801 sfrm = frm; 1802 while (efrm - frm > 1) { 1803 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1804 switch (*frm) { 1805 case IEEE80211_ELEMID_SSID: 1806 ssid = frm; 1807 break; 1808 case IEEE80211_ELEMID_RATES: 1809 rates = frm; 1810 break; 1811 case IEEE80211_ELEMID_XRATES: 1812 xrates = frm; 1813 break; 1814 } 1815 frm += frm[1] + 2; 1816 } 1817 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1818 if (xrates != NULL) 1819 IEEE80211_VERIFY_ELEMENT(xrates, 1820 IEEE80211_RATE_MAXSIZE - rates[1], return); 1821 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1822 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1823 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1824 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1825 wh, NULL, 1826 "%s", "no ssid with ssid suppression enabled"); 1827 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1828 return; 1829 } 1830 1831 /* XXX find a better class or define it's own */ 1832 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1833 "%s", "recv probe req"); 1834 /* 1835 * Some legacy 11b clients cannot hack a complete 1836 * probe response frame. When the request includes 1837 * only a bare-bones rate set, communicate this to 1838 * the transmit side. 1839 */ 1840 ieee80211_send_proberesp(vap, wh->i_addr2, 1841 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1842 break; 1843 1844 case IEEE80211_FC0_SUBTYPE_AUTH: { 1845 uint16_t algo, seq, status; 1846 1847 if (vap->iv_state != IEEE80211_S_RUN) { 1848 vap->iv_stats.is_rx_mgtdiscard++; 1849 return; 1850 } 1851 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1852 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1853 wh, NULL, "%s", "wrong bssid"); 1854 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1855 return; 1856 } 1857 /* 1858 * auth frame format 1859 * [2] algorithm 1860 * [2] sequence 1861 * [2] status 1862 * [tlv*] challenge 1863 */ 1864 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1865 algo = le16toh(*(uint16_t *)frm); 1866 seq = le16toh(*(uint16_t *)(frm + 2)); 1867 status = le16toh(*(uint16_t *)(frm + 4)); 1868 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1869 "recv auth frame with algorithm %d seq %d", algo, seq); 1870 /* 1871 * Consult the ACL policy module if setup. 1872 */ 1873 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1874 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1875 wh, NULL, "%s", "disallowed by ACL"); 1876 vap->iv_stats.is_rx_acl++; 1877 ieee80211_send_error(ni, wh->i_addr2, 1878 IEEE80211_FC0_SUBTYPE_AUTH, 1879 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1880 return; 1881 } 1882 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1883 IEEE80211_DISCARD(vap, 1884 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1885 wh, NULL, "%s", "TKIP countermeasures enabled"); 1886 vap->iv_stats.is_rx_auth_countermeasures++; 1887 ieee80211_send_error(ni, wh->i_addr2, 1888 IEEE80211_FC0_SUBTYPE_AUTH, 1889 IEEE80211_REASON_MIC_FAILURE); 1890 return; 1891 } 1892 if (algo == IEEE80211_AUTH_ALG_SHARED) 1893 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1894 seq, status); 1895 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1896 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1897 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1898 authalgreject(ni, wh, algo, 1899 seq+1, IEEE80211_STATUS_ALG); 1900 return; 1901 } else { 1902 /* 1903 * We assume that an unknown algorithm is the result 1904 * of a decryption failure on a shared key auth frame; 1905 * return a status code appropriate for that instead 1906 * of IEEE80211_STATUS_ALG. 1907 * 1908 * NB: a seq# of 4 is intentional; the decrypted 1909 * frame likely has a bogus seq value. 1910 */ 1911 authalgreject(ni, wh, algo, 1912 4, IEEE80211_STATUS_CHALLENGE); 1913 return; 1914 } 1915 break; 1916 } 1917 1918 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1919 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1920 uint16_t capinfo, lintval; 1921 struct ieee80211_rsnparms rsnparms; 1922 1923 if (vap->iv_state != IEEE80211_S_RUN) { 1924 vap->iv_stats.is_rx_mgtdiscard++; 1925 return; 1926 } 1927 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1928 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1929 wh, NULL, "%s", "wrong bssid"); 1930 vap->iv_stats.is_rx_assoc_bss++; 1931 return; 1932 } 1933 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1934 reassoc = 1; 1935 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1936 } else { 1937 reassoc = 0; 1938 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1939 } 1940 if (ni == vap->iv_bss) { 1941 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1942 "deny %s request, sta not authenticated", 1943 reassoc ? "reassoc" : "assoc"); 1944 ieee80211_send_error(ni, wh->i_addr2, 1945 IEEE80211_FC0_SUBTYPE_DEAUTH, 1946 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1947 vap->iv_stats.is_rx_assoc_notauth++; 1948 return; 1949 } 1950 1951 /* 1952 * asreq frame format 1953 * [2] capability information 1954 * [2] listen interval 1955 * [6*] current AP address (reassoc only) 1956 * [tlv] ssid 1957 * [tlv] supported rates 1958 * [tlv] extended supported rates 1959 * [tlv] WPA or RSN 1960 * [tlv] HT capabilities 1961 * [tlv] Atheros capabilities 1962 */ 1963 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1964 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1965 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1966 if (reassoc) 1967 frm += 6; /* ignore current AP info */ 1968 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1969 sfrm = frm; 1970 while (efrm - frm > 1) { 1971 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1972 switch (*frm) { 1973 case IEEE80211_ELEMID_SSID: 1974 ssid = frm; 1975 break; 1976 case IEEE80211_ELEMID_RATES: 1977 rates = frm; 1978 break; 1979 case IEEE80211_ELEMID_XRATES: 1980 xrates = frm; 1981 break; 1982 case IEEE80211_ELEMID_RSN: 1983 rsn = frm; 1984 break; 1985 case IEEE80211_ELEMID_HTCAP: 1986 htcap = frm; 1987 break; 1988 case IEEE80211_ELEMID_VENDOR: 1989 if (iswpaoui(frm)) 1990 wpa = frm; 1991 else if (iswmeinfo(frm)) 1992 wme = frm; 1993 #ifdef IEEE80211_SUPPORT_SUPERG 1994 else if (isatherosoui(frm)) 1995 ath = frm; 1996 #endif 1997 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 1998 if (ishtcapoui(frm) && htcap == NULL) 1999 htcap = frm; 2000 } 2001 break; 2002 } 2003 frm += frm[1] + 2; 2004 } 2005 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2006 if (xrates != NULL) 2007 IEEE80211_VERIFY_ELEMENT(xrates, 2008 IEEE80211_RATE_MAXSIZE - rates[1], return); 2009 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2010 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2011 if (htcap != NULL) { 2012 IEEE80211_VERIFY_LENGTH(htcap[1], 2013 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2014 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2015 sizeof(struct ieee80211_ie_htcap)-2, 2016 return); /* XXX just NULL out? */ 2017 } 2018 2019 if ((vap->iv_flags & IEEE80211_F_WPA) && 2020 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2021 return; 2022 /* discard challenge after association */ 2023 if (ni->ni_challenge != NULL) { 2024 IEEE80211_FREE(ni->ni_challenge, M_80211_NODE); 2025 ni->ni_challenge = NULL; 2026 } 2027 /* NB: 802.11 spec says to ignore station's privacy bit */ 2028 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2029 capinfomismatch(ni, wh, reassoc, resp, 2030 "capability", capinfo); 2031 return; 2032 } 2033 /* 2034 * Disallow re-associate w/ invalid slot time setting. 2035 */ 2036 if (ni->ni_associd != 0 && 2037 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2038 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2039 capinfomismatch(ni, wh, reassoc, resp, 2040 "slot time", capinfo); 2041 return; 2042 } 2043 rate = ieee80211_setup_rates(ni, rates, xrates, 2044 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2045 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2046 if (rate & IEEE80211_RATE_BASIC) { 2047 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2048 vap->iv_stats.is_rx_assoc_norate++; 2049 return; 2050 } 2051 /* 2052 * If constrained to 11g-only stations reject an 2053 * 11b-only station. We cheat a bit here by looking 2054 * at the max negotiated xmit rate and assuming anyone 2055 * with a best rate <24Mb/s is an 11b station. 2056 */ 2057 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2058 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2059 vap->iv_stats.is_rx_assoc_norate++; 2060 return; 2061 } 2062 /* 2063 * Do HT rate set handling and setup HT node state. 2064 */ 2065 ni->ni_chan = vap->iv_bss->ni_chan; 2066 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2067 rate = ieee80211_setup_htrates(ni, htcap, 2068 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2069 IEEE80211_F_DOBRS); 2070 if (rate & IEEE80211_RATE_BASIC) { 2071 ratesetmismatch(ni, wh, reassoc, resp, 2072 "HT", rate); 2073 vap->iv_stats.is_ht_assoc_norate++; 2074 return; 2075 } 2076 ieee80211_ht_node_init(ni); 2077 ieee80211_ht_updatehtcap(ni, htcap); 2078 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2079 ieee80211_ht_node_cleanup(ni); 2080 #ifdef IEEE80211_SUPPORT_SUPERG 2081 /* Always do ff node cleanup; for A-MSDU */ 2082 ieee80211_ff_node_cleanup(ni); 2083 #endif 2084 /* 2085 * Allow AMPDU operation only with unencrypted traffic 2086 * or AES-CCM; the 11n spec only specifies these ciphers 2087 * so permitting any others is undefined and can lead 2088 * to interoperability problems. 2089 */ 2090 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2091 (((vap->iv_flags & IEEE80211_F_WPA) && 2092 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2093 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2094 IEEE80211_NOTE(vap, 2095 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2096 "disallow HT use because WEP or TKIP requested, " 2097 "capinfo 0x%x ucastcipher %d", capinfo, 2098 rsnparms.rsn_ucastcipher); 2099 ieee80211_ht_node_cleanup(ni); 2100 #ifdef IEEE80211_SUPPORT_SUPERG 2101 /* Always do ff node cleanup; for A-MSDU */ 2102 ieee80211_ff_node_cleanup(ni); 2103 #endif 2104 vap->iv_stats.is_ht_assoc_downgrade++; 2105 } 2106 /* 2107 * If constrained to 11n-only stations reject legacy stations. 2108 */ 2109 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2110 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2111 htcapmismatch(ni, wh, reassoc, resp); 2112 vap->iv_stats.is_ht_assoc_nohtcap++; 2113 return; 2114 } 2115 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2116 ni->ni_noise = nf; 2117 ni->ni_intval = lintval; 2118 ni->ni_capinfo = capinfo; 2119 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2120 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2121 /* 2122 * Store the IEs. 2123 * XXX maybe better to just expand 2124 */ 2125 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2126 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2127 if (wpa != NULL) 2128 setie(wpa_ie, wpa - sfrm); 2129 if (rsn != NULL) 2130 setie(rsn_ie, rsn - sfrm); 2131 if (htcap != NULL) 2132 setie(htcap_ie, htcap - sfrm); 2133 if (wme != NULL) { 2134 setie(wme_ie, wme - sfrm); 2135 /* 2136 * Mark node as capable of QoS. 2137 */ 2138 ni->ni_flags |= IEEE80211_NODE_QOS; 2139 } else 2140 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2141 #ifdef IEEE80211_SUPPORT_SUPERG 2142 if (ath != NULL) { 2143 setie(ath_ie, ath - sfrm); 2144 /* 2145 * Parse ATH station parameters. 2146 */ 2147 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2148 } else 2149 #endif 2150 ni->ni_ath_flags = 0; 2151 #undef setie 2152 } else { 2153 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2154 ni->ni_ath_flags = 0; 2155 } 2156 ieee80211_node_join(ni, resp); 2157 ieee80211_deliver_l2uf(ni); 2158 break; 2159 } 2160 2161 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2162 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2163 uint16_t reason; 2164 2165 if (vap->iv_state != IEEE80211_S_RUN || 2166 /* NB: can happen when in promiscuous mode */ 2167 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2168 vap->iv_stats.is_rx_mgtdiscard++; 2169 break; 2170 } 2171 /* 2172 * deauth/disassoc frame format 2173 * [2] reason 2174 */ 2175 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2176 reason = le16toh(*(uint16_t *)frm); 2177 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2178 vap->iv_stats.is_rx_deauth++; 2179 IEEE80211_NODE_STAT(ni, rx_deauth); 2180 } else { 2181 vap->iv_stats.is_rx_disassoc++; 2182 IEEE80211_NODE_STAT(ni, rx_disassoc); 2183 } 2184 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2185 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2186 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2187 if (ni != vap->iv_bss) 2188 ieee80211_node_leave(ni); 2189 break; 2190 } 2191 2192 case IEEE80211_FC0_SUBTYPE_ACTION: 2193 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2194 if (ni == vap->iv_bss) { 2195 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2196 wh, NULL, "%s", "unknown node"); 2197 vap->iv_stats.is_rx_mgtdiscard++; 2198 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2199 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2200 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2201 wh, NULL, "%s", "not for us"); 2202 vap->iv_stats.is_rx_mgtdiscard++; 2203 } else if (vap->iv_state != IEEE80211_S_RUN) { 2204 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2205 wh, NULL, "wrong state %s", 2206 ieee80211_state_name[vap->iv_state]); 2207 vap->iv_stats.is_rx_mgtdiscard++; 2208 } else { 2209 if (ieee80211_parse_action(ni, m0) == 0) 2210 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2211 } 2212 break; 2213 2214 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2215 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2216 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 2217 case IEEE80211_FC0_SUBTYPE_ATIM: 2218 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2219 wh, NULL, "%s", "not handled"); 2220 vap->iv_stats.is_rx_mgtdiscard++; 2221 break; 2222 2223 default: 2224 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2225 wh, "mgt", "subtype 0x%x not handled", subtype); 2226 vap->iv_stats.is_rx_badsubtype++; 2227 break; 2228 } 2229 } 2230 2231 static void 2232 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2233 { 2234 switch (subtype) { 2235 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2236 ni->ni_vap->iv_recv_pspoll(ni, m); 2237 break; 2238 case IEEE80211_FC0_SUBTYPE_BAR: 2239 ieee80211_recv_bar(ni, m); 2240 break; 2241 } 2242 } 2243 2244 /* 2245 * Process a received ps-poll frame. 2246 */ 2247 void 2248 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2249 { 2250 struct ieee80211vap *vap = ni->ni_vap; 2251 struct ieee80211com *ic = vap->iv_ic; 2252 struct ieee80211_frame_min *wh; 2253 struct mbuf *m; 2254 uint16_t aid; 2255 int qlen; 2256 2257 wh = mtod(m0, struct ieee80211_frame_min *); 2258 if (ni->ni_associd == 0) { 2259 IEEE80211_DISCARD(vap, 2260 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2261 (struct ieee80211_frame *) wh, NULL, 2262 "%s", "unassociated station"); 2263 vap->iv_stats.is_ps_unassoc++; 2264 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2265 IEEE80211_REASON_NOT_ASSOCED); 2266 return; 2267 } 2268 2269 aid = le16toh(*(uint16_t *)wh->i_dur); 2270 if (aid != ni->ni_associd) { 2271 IEEE80211_DISCARD(vap, 2272 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2273 (struct ieee80211_frame *) wh, NULL, 2274 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2275 ni->ni_associd, aid); 2276 vap->iv_stats.is_ps_badaid++; 2277 /* 2278 * NB: We used to deauth the station but it turns out 2279 * the Blackberry Curve 8230 (and perhaps other devices) 2280 * sometimes send the wrong AID when WME is negotiated. 2281 * Being more lenient here seems ok as we already check 2282 * the station is associated and we only return frames 2283 * queued for the station (i.e. we don't use the AID). 2284 */ 2285 return; 2286 } 2287 2288 /* Okay, take the first queued packet and put it out... */ 2289 m = ieee80211_node_psq_dequeue(ni, &qlen); 2290 if (m == NULL) { 2291 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2292 "%s", "recv ps-poll, but queue empty"); 2293 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2294 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2295 if (vap->iv_set_tim != NULL) 2296 vap->iv_set_tim(ni, 0); /* just in case */ 2297 return; 2298 } 2299 /* 2300 * If there are more packets, set the more packets bit 2301 * in the packet dispatched to the station; otherwise 2302 * turn off the TIM bit. 2303 */ 2304 if (qlen != 0) { 2305 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2306 "recv ps-poll, send packet, %u still queued", qlen); 2307 m->m_flags |= M_MORE_DATA; 2308 } else { 2309 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2310 "%s", "recv ps-poll, send packet, queue empty"); 2311 if (vap->iv_set_tim != NULL) 2312 vap->iv_set_tim(ni, 0); 2313 } 2314 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2315 2316 /* 2317 * Do the right thing; if it's an encap'ed frame then 2318 * call ieee80211_parent_xmitpkt() else 2319 * call ieee80211_vap_xmitpkt(). 2320 */ 2321 if (m->m_flags & M_ENCAP) { 2322 (void) ieee80211_parent_xmitpkt(ic, m); 2323 } else { 2324 (void) ieee80211_vap_xmitpkt(vap, m); 2325 } 2326 } 2327