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 int rssi, int nf); 72 static void hostap_deliver_data(struct ieee80211vap *, 73 struct ieee80211_node *, struct mbuf *); 74 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 75 int subtype, int rssi, int nf); 76 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 77 78 void 79 ieee80211_hostap_attach(struct ieee80211com *ic) 80 { 81 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 82 } 83 84 void 85 ieee80211_hostap_detach(struct ieee80211com *ic) 86 { 87 } 88 89 static void 90 hostap_vdetach(struct ieee80211vap *vap) 91 { 92 } 93 94 static void 95 hostap_vattach(struct ieee80211vap *vap) 96 { 97 vap->iv_newstate = hostap_newstate; 98 vap->iv_input = hostap_input; 99 vap->iv_recv_mgmt = hostap_recv_mgmt; 100 vap->iv_recv_ctl = hostap_recv_ctl; 101 vap->iv_opdetach = hostap_vdetach; 102 vap->iv_deliver_data = hostap_deliver_data; 103 vap->iv_recv_pspoll = ieee80211_recv_pspoll; 104 } 105 106 static void 107 sta_disassoc(void *arg, struct ieee80211_node *ni) 108 { 109 struct ieee80211vap *vap = arg; 110 111 if (ni->ni_vap == vap && ni->ni_associd != 0) { 112 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 113 IEEE80211_REASON_ASSOC_LEAVE); 114 ieee80211_node_leave(ni); 115 } 116 } 117 118 static void 119 sta_csa(void *arg, struct ieee80211_node *ni) 120 { 121 struct ieee80211vap *vap = arg; 122 123 if (ni->ni_vap == vap && ni->ni_associd != 0) 124 if (ni->ni_inact > vap->iv_inact_init) { 125 ni->ni_inact = vap->iv_inact_init; 126 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 127 "%s: inact %u", __func__, ni->ni_inact); 128 } 129 } 130 131 static void 132 sta_drop(void *arg, struct ieee80211_node *ni) 133 { 134 struct ieee80211vap *vap = arg; 135 136 if (ni->ni_vap == vap && ni->ni_associd != 0) 137 ieee80211_node_leave(ni); 138 } 139 140 /* 141 * Does a channel change require associated stations to re-associate 142 * so protocol state is correct. This is used when doing CSA across 143 * bands or similar (e.g. HT -> legacy). 144 */ 145 static int 146 isbandchange(struct ieee80211com *ic) 147 { 148 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 149 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 150 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 151 } 152 153 /* 154 * IEEE80211_M_HOSTAP vap state machine handler. 155 */ 156 static int 157 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 158 { 159 struct ieee80211com *ic = vap->iv_ic; 160 enum ieee80211_state ostate; 161 162 IEEE80211_LOCK_ASSERT(ic); 163 164 ostate = vap->iv_state; 165 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 166 __func__, ieee80211_state_name[ostate], 167 ieee80211_state_name[nstate], arg); 168 vap->iv_state = nstate; /* state transition */ 169 if (ostate != IEEE80211_S_SCAN) 170 ieee80211_cancel_scan(vap); /* background scan */ 171 switch (nstate) { 172 case IEEE80211_S_INIT: 173 switch (ostate) { 174 case IEEE80211_S_SCAN: 175 ieee80211_cancel_scan(vap); 176 break; 177 case IEEE80211_S_CAC: 178 ieee80211_dfs_cac_stop(vap); 179 break; 180 case IEEE80211_S_RUN: 181 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 182 break; 183 default: 184 break; 185 } 186 if (ostate != IEEE80211_S_INIT) { 187 /* NB: optimize INIT -> INIT case */ 188 ieee80211_reset_bss(vap); 189 } 190 if (vap->iv_auth->ia_detach != NULL) 191 vap->iv_auth->ia_detach(vap); 192 break; 193 case IEEE80211_S_SCAN: 194 switch (ostate) { 195 case IEEE80211_S_CSA: 196 case IEEE80211_S_RUN: 197 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 198 /* 199 * Clear overlapping BSS state; the beacon frame 200 * will be reconstructed on transition to the RUN 201 * state and the timeout routines check if the flag 202 * is set before doing anything so this is sufficient. 203 */ 204 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 205 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 206 /* fall thru... */ 207 case IEEE80211_S_CAC: 208 /* 209 * NB: We may get here because of a manual channel 210 * change in which case we need to stop CAC 211 * XXX no need to stop if ostate RUN but it's ok 212 */ 213 ieee80211_dfs_cac_stop(vap); 214 /* fall thru... */ 215 case IEEE80211_S_INIT: 216 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 217 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 218 /* 219 * Already have a channel; bypass the 220 * scan and startup immediately. 221 * ieee80211_create_ibss will call back to 222 * move us to RUN state. 223 */ 224 ieee80211_create_ibss(vap, vap->iv_des_chan); 225 break; 226 } 227 /* 228 * Initiate a scan. We can come here as a result 229 * of an IEEE80211_IOC_SCAN_REQ too in which case 230 * the vap will be marked with IEEE80211_FEXT_SCANREQ 231 * and the scan request parameters will be present 232 * in iv_scanreq. Otherwise we do the default. 233 */ 234 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 235 ieee80211_check_scan(vap, 236 vap->iv_scanreq_flags, 237 vap->iv_scanreq_duration, 238 vap->iv_scanreq_mindwell, 239 vap->iv_scanreq_maxdwell, 240 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 241 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 242 } else 243 ieee80211_check_scan_current(vap); 244 break; 245 case IEEE80211_S_SCAN: 246 /* 247 * A state change requires a reset; scan. 248 */ 249 ieee80211_check_scan_current(vap); 250 break; 251 default: 252 break; 253 } 254 break; 255 case IEEE80211_S_CAC: 256 /* 257 * Start CAC on a DFS channel. We come here when starting 258 * a bss on a DFS channel (see ieee80211_create_ibss). 259 */ 260 ieee80211_dfs_cac_start(vap); 261 break; 262 case IEEE80211_S_RUN: 263 if (vap->iv_flags & IEEE80211_F_WPA) { 264 /* XXX validate prerequisites */ 265 } 266 switch (ostate) { 267 case IEEE80211_S_INIT: 268 /* 269 * Already have a channel; bypass the 270 * scan and startup immediately. 271 * Note that ieee80211_create_ibss will call 272 * back to do a RUN->RUN state change. 273 */ 274 ieee80211_create_ibss(vap, 275 ieee80211_ht_adjust_channel(ic, 276 ic->ic_curchan, vap->iv_flags_ht)); 277 /* NB: iv_bss is changed on return */ 278 break; 279 case IEEE80211_S_CAC: 280 /* 281 * NB: This is the normal state change when CAC 282 * expires and no radar was detected; no need to 283 * clear the CAC timer as it's already expired. 284 */ 285 /* fall thru... */ 286 case IEEE80211_S_CSA: 287 /* 288 * Shorten inactivity timer of associated stations 289 * to weed out sta's that don't follow a CSA. 290 */ 291 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 292 /* 293 * Update bss node channel to reflect where 294 * we landed after CSA. 295 */ 296 ieee80211_node_set_chan(vap->iv_bss, 297 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 298 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 299 /* XXX bypass debug msgs */ 300 break; 301 case IEEE80211_S_SCAN: 302 case IEEE80211_S_RUN: 303 #ifdef IEEE80211_DEBUG 304 if (ieee80211_msg_debug(vap)) { 305 struct ieee80211_node *ni = vap->iv_bss; 306 ieee80211_note(vap, 307 "synchronized with %s ssid ", 308 ether_sprintf(ni->ni_bssid)); 309 ieee80211_print_essid(ni->ni_essid, 310 ni->ni_esslen); 311 /* XXX MCS/HT */ 312 printf(" channel %d start %uMb\n", 313 ieee80211_chan2ieee(ic, ic->ic_curchan), 314 IEEE80211_RATE2MBS(ni->ni_txrate)); 315 } 316 #endif 317 break; 318 default: 319 break; 320 } 321 /* 322 * Start/stop the authenticator. We delay until here 323 * to allow configuration to happen out of order. 324 */ 325 if (vap->iv_auth->ia_attach != NULL) { 326 /* XXX check failure */ 327 vap->iv_auth->ia_attach(vap); 328 } else if (vap->iv_auth->ia_detach != NULL) { 329 vap->iv_auth->ia_detach(vap); 330 } 331 ieee80211_node_authorize(vap->iv_bss); 332 break; 333 case IEEE80211_S_CSA: 334 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 335 /* 336 * On a ``band change'' silently drop associated 337 * stations as they must re-associate before they 338 * can pass traffic (as otherwise protocol state 339 * such as capabilities and the negotiated rate 340 * set may/will be wrong). 341 */ 342 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 343 } 344 break; 345 default: 346 break; 347 } 348 return 0; 349 } 350 351 static void 352 hostap_deliver_data(struct ieee80211vap *vap, 353 struct ieee80211_node *ni, struct mbuf *m) 354 { 355 struct ether_header *eh = mtod(m, struct ether_header *); 356 struct ifnet *ifp = vap->iv_ifp; 357 358 /* clear driver/net80211 flags before passing up */ 359 #if __FreeBSD_version >= 1000046 360 m->m_flags &= ~(M_MCAST | M_BCAST); 361 m_clrprotoflags(m); 362 #else 363 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 364 #endif 365 366 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 367 ("gack, opmode %d", vap->iv_opmode)); 368 /* 369 * Do accounting. 370 */ 371 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 372 IEEE80211_NODE_STAT(ni, rx_data); 373 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 374 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 375 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 376 IEEE80211_NODE_STAT(ni, rx_mcast); 377 } else 378 IEEE80211_NODE_STAT(ni, rx_ucast); 379 380 /* perform as a bridge within the AP */ 381 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 382 struct mbuf *mcopy = NULL; 383 384 if (m->m_flags & M_MCAST) { 385 mcopy = m_dup(m, M_NOWAIT); 386 if (mcopy == NULL) 387 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 388 else 389 mcopy->m_flags |= M_MCAST; 390 } else { 391 /* 392 * Check if the destination is associated with the 393 * same vap and authorized to receive traffic. 394 * Beware of traffic destined for the vap itself; 395 * sending it will not work; just let it be delivered 396 * normally. 397 */ 398 struct ieee80211_node *sta = ieee80211_find_vap_node( 399 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 400 if (sta != NULL) { 401 if (ieee80211_node_is_authorized(sta)) { 402 /* 403 * Beware of sending to ourself; this 404 * needs to happen via the normal 405 * input path. 406 */ 407 if (sta != vap->iv_bss) { 408 mcopy = m; 409 m = NULL; 410 } 411 } else { 412 vap->iv_stats.is_rx_unauth++; 413 IEEE80211_NODE_STAT(sta, rx_unauth); 414 } 415 ieee80211_free_node(sta); 416 } 417 } 418 if (mcopy != NULL) { 419 int len, err; 420 len = mcopy->m_pkthdr.len; 421 err = ieee80211_vap_xmitpkt(vap, mcopy); 422 if (err) { 423 /* NB: IFQ_HANDOFF reclaims mcopy */ 424 } else { 425 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 426 } 427 } 428 } 429 if (m != NULL) { 430 /* 431 * Mark frame as coming from vap's interface. 432 */ 433 m->m_pkthdr.rcvif = ifp; 434 if (m->m_flags & M_MCAST) { 435 /* 436 * Spam DWDS vap's w/ multicast traffic. 437 */ 438 /* XXX only if dwds in use? */ 439 ieee80211_dwds_mcast(vap, m); 440 } 441 if (ni->ni_vlan != 0) { 442 /* attach vlan tag */ 443 m->m_pkthdr.ether_vtag = ni->ni_vlan; 444 m->m_flags |= M_VLANTAG; 445 } 446 ifp->if_input(ifp, m); 447 } 448 } 449 450 /* 451 * Decide if a received management frame should be 452 * printed when debugging is enabled. This filters some 453 * of the less interesting frames that come frequently 454 * (e.g. beacons). 455 */ 456 static __inline int 457 doprint(struct ieee80211vap *vap, int subtype) 458 { 459 switch (subtype) { 460 case IEEE80211_FC0_SUBTYPE_BEACON: 461 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 462 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 463 return 0; 464 } 465 return 1; 466 } 467 468 /* 469 * Process a received frame. The node associated with the sender 470 * should be supplied. If nothing was found in the node table then 471 * the caller is assumed to supply a reference to iv_bss instead. 472 * The RSSI and a timestamp are also supplied. The RSSI data is used 473 * during AP scanning to select a AP to associate with; it can have 474 * any units so long as values have consistent units and higher values 475 * mean ``better signal''. The receive timestamp is currently not used 476 * by the 802.11 layer. 477 */ 478 static int 479 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 480 { 481 #define HAS_SEQ(type) ((type & 0x4) == 0) 482 struct ieee80211vap *vap = ni->ni_vap; 483 struct ieee80211com *ic = ni->ni_ic; 484 struct ifnet *ifp = vap->iv_ifp; 485 struct ieee80211_frame *wh; 486 struct ieee80211_key *key; 487 struct ether_header *eh; 488 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 489 uint8_t dir, type, subtype, qos; 490 uint8_t *bssid; 491 uint16_t rxseq; 492 493 if (m->m_flags & M_AMPDU_MPDU) { 494 /* 495 * Fastpath for A-MPDU reorder q resubmission. Frames 496 * w/ M_AMPDU_MPDU marked have already passed through 497 * here but were received out of order and been held on 498 * the reorder queue. When resubmitted they are marked 499 * with the M_AMPDU_MPDU flag and we can bypass most of 500 * the normal processing. 501 */ 502 wh = mtod(m, struct ieee80211_frame *); 503 type = IEEE80211_FC0_TYPE_DATA; 504 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 505 subtype = IEEE80211_FC0_SUBTYPE_QOS; 506 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 507 goto resubmit_ampdu; 508 } 509 510 KASSERT(ni != NULL, ("null node")); 511 ni->ni_inact = ni->ni_inact_reload; 512 513 type = -1; /* undefined */ 514 515 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 516 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 517 ni->ni_macaddr, NULL, 518 "too short (1): len %u", m->m_pkthdr.len); 519 vap->iv_stats.is_rx_tooshort++; 520 goto out; 521 } 522 /* 523 * Bit of a cheat here, we use a pointer for a 3-address 524 * frame format but don't reference fields past outside 525 * ieee80211_frame_min w/o first validating the data is 526 * present. 527 */ 528 wh = mtod(m, struct ieee80211_frame *); 529 530 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 531 IEEE80211_FC0_VERSION_0) { 532 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 533 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 534 wh->i_fc[0], wh->i_fc[1]); 535 vap->iv_stats.is_rx_badversion++; 536 goto err; 537 } 538 539 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 540 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 541 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 542 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 543 if (dir != IEEE80211_FC1_DIR_NODS) 544 bssid = wh->i_addr1; 545 else if (type == IEEE80211_FC0_TYPE_CTL) 546 bssid = wh->i_addr1; 547 else { 548 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 549 IEEE80211_DISCARD_MAC(vap, 550 IEEE80211_MSG_ANY, ni->ni_macaddr, 551 NULL, "too short (2): len %u", 552 m->m_pkthdr.len); 553 vap->iv_stats.is_rx_tooshort++; 554 goto out; 555 } 556 bssid = wh->i_addr3; 557 } 558 /* 559 * Validate the bssid. 560 */ 561 if (!(type == IEEE80211_FC0_TYPE_MGT && 562 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 563 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 564 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 565 /* not interested in */ 566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 567 bssid, NULL, "%s", "not to bss"); 568 vap->iv_stats.is_rx_wrongbss++; 569 goto out; 570 } 571 572 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 573 ni->ni_noise = nf; 574 if (HAS_SEQ(type)) { 575 uint8_t tid = ieee80211_gettid(wh); 576 if (IEEE80211_QOS_HAS_SEQ(wh) && 577 TID_TO_WME_AC(tid) >= WME_AC_VI) 578 ic->ic_wme.wme_hipri_traffic++; 579 rxseq = le16toh(*(uint16_t *)wh->i_seq); 580 if (! ieee80211_check_rxseq(ni, wh)) { 581 /* duplicate, discard */ 582 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 583 bssid, "duplicate", 584 "seqno <%u,%u> fragno <%u,%u> tid %u", 585 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 586 ni->ni_rxseqs[tid] >> 587 IEEE80211_SEQ_SEQ_SHIFT, 588 rxseq & IEEE80211_SEQ_FRAG_MASK, 589 ni->ni_rxseqs[tid] & 590 IEEE80211_SEQ_FRAG_MASK, 591 tid); 592 vap->iv_stats.is_rx_dup++; 593 IEEE80211_NODE_STAT(ni, rx_dup); 594 goto out; 595 } 596 ni->ni_rxseqs[tid] = rxseq; 597 } 598 } 599 600 switch (type) { 601 case IEEE80211_FC0_TYPE_DATA: 602 hdrspace = ieee80211_hdrspace(ic, wh); 603 if (m->m_len < hdrspace && 604 (m = m_pullup(m, hdrspace)) == NULL) { 605 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 606 ni->ni_macaddr, NULL, 607 "data too short: expecting %u", hdrspace); 608 vap->iv_stats.is_rx_tooshort++; 609 goto out; /* XXX */ 610 } 611 if (!(dir == IEEE80211_FC1_DIR_TODS || 612 (dir == IEEE80211_FC1_DIR_DSTODS && 613 (vap->iv_flags & IEEE80211_F_DWDS)))) { 614 if (dir != IEEE80211_FC1_DIR_DSTODS) { 615 IEEE80211_DISCARD(vap, 616 IEEE80211_MSG_INPUT, wh, "data", 617 "incorrect dir 0x%x", dir); 618 } else { 619 IEEE80211_DISCARD(vap, 620 IEEE80211_MSG_INPUT | 621 IEEE80211_MSG_WDS, wh, 622 "4-address data", 623 "%s", "DWDS not enabled"); 624 } 625 vap->iv_stats.is_rx_wrongdir++; 626 goto out; 627 } 628 /* check if source STA is associated */ 629 if (ni == vap->iv_bss) { 630 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 631 wh, "data", "%s", "unknown src"); 632 ieee80211_send_error(ni, wh->i_addr2, 633 IEEE80211_FC0_SUBTYPE_DEAUTH, 634 IEEE80211_REASON_NOT_AUTHED); 635 vap->iv_stats.is_rx_notassoc++; 636 goto err; 637 } 638 if (ni->ni_associd == 0) { 639 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 640 wh, "data", "%s", "unassoc src"); 641 IEEE80211_SEND_MGMT(ni, 642 IEEE80211_FC0_SUBTYPE_DISASSOC, 643 IEEE80211_REASON_NOT_ASSOCED); 644 vap->iv_stats.is_rx_notassoc++; 645 goto err; 646 } 647 648 /* 649 * Check for power save state change. 650 * XXX out-of-order A-MPDU frames? 651 */ 652 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 653 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 654 vap->iv_node_ps(ni, 655 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 656 /* 657 * For 4-address packets handle WDS discovery 658 * notifications. Once a WDS link is setup frames 659 * are just delivered to the WDS vap (see below). 660 */ 661 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 662 if (!ieee80211_node_is_authorized(ni)) { 663 IEEE80211_DISCARD(vap, 664 IEEE80211_MSG_INPUT | 665 IEEE80211_MSG_WDS, wh, 666 "4-address data", 667 "%s", "unauthorized port"); 668 vap->iv_stats.is_rx_unauth++; 669 IEEE80211_NODE_STAT(ni, rx_unauth); 670 goto err; 671 } 672 ieee80211_dwds_discover(ni, m); 673 return type; 674 } 675 676 /* 677 * Handle A-MPDU re-ordering. If the frame is to be 678 * processed directly then ieee80211_ampdu_reorder 679 * will return 0; otherwise it has consumed the mbuf 680 * and we should do nothing more with it. 681 */ 682 if ((m->m_flags & M_AMPDU) && 683 ieee80211_ampdu_reorder(ni, m) != 0) { 684 m = NULL; 685 goto out; 686 } 687 resubmit_ampdu: 688 689 /* 690 * Handle privacy requirements. Note that we 691 * must not be preempted from here until after 692 * we (potentially) call ieee80211_crypto_demic; 693 * otherwise we may violate assumptions in the 694 * crypto cipher modules used to do delayed update 695 * of replay sequence numbers. 696 */ 697 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 698 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 699 /* 700 * Discard encrypted frames when privacy is off. 701 */ 702 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 703 wh, "WEP", "%s", "PRIVACY off"); 704 vap->iv_stats.is_rx_noprivacy++; 705 IEEE80211_NODE_STAT(ni, rx_noprivacy); 706 goto out; 707 } 708 key = ieee80211_crypto_decap(ni, m, hdrspace); 709 if (key == NULL) { 710 /* NB: stats+msgs handled in crypto_decap */ 711 IEEE80211_NODE_STAT(ni, rx_wepfail); 712 goto out; 713 } 714 wh = mtod(m, struct ieee80211_frame *); 715 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 716 } else { 717 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 718 key = NULL; 719 } 720 721 /* 722 * Save QoS bits for use below--before we strip the header. 723 */ 724 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 725 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 726 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 727 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 728 } else 729 qos = 0; 730 731 /* 732 * Next up, any fragmentation. 733 */ 734 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 735 m = ieee80211_defrag(ni, m, hdrspace); 736 if (m == NULL) { 737 /* Fragment dropped or frame not complete yet */ 738 goto out; 739 } 740 } 741 wh = NULL; /* no longer valid, catch any uses */ 742 743 /* 744 * Next strip any MSDU crypto bits. 745 */ 746 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 747 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 748 ni->ni_macaddr, "data", "%s", "demic error"); 749 vap->iv_stats.is_rx_demicfail++; 750 IEEE80211_NODE_STAT(ni, rx_demicfail); 751 goto out; 752 } 753 /* copy to listener after decrypt */ 754 if (ieee80211_radiotap_active_vap(vap)) 755 ieee80211_radiotap_rx(vap, m); 756 need_tap = 0; 757 /* 758 * Finally, strip the 802.11 header. 759 */ 760 m = ieee80211_decap(vap, m, hdrspace); 761 if (m == NULL) { 762 /* XXX mask bit to check for both */ 763 /* don't count Null data frames as errors */ 764 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 765 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 766 goto out; 767 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 768 ni->ni_macaddr, "data", "%s", "decap error"); 769 vap->iv_stats.is_rx_decap++; 770 IEEE80211_NODE_STAT(ni, rx_decap); 771 goto err; 772 } 773 eh = mtod(m, struct ether_header *); 774 if (!ieee80211_node_is_authorized(ni)) { 775 /* 776 * Deny any non-PAE frames received prior to 777 * authorization. For open/shared-key 778 * authentication the port is mark authorized 779 * after authentication completes. For 802.1x 780 * the port is not marked authorized by the 781 * authenticator until the handshake has completed. 782 */ 783 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 784 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 785 eh->ether_shost, "data", 786 "unauthorized port: ether type 0x%x len %u", 787 eh->ether_type, m->m_pkthdr.len); 788 vap->iv_stats.is_rx_unauth++; 789 IEEE80211_NODE_STAT(ni, rx_unauth); 790 goto err; 791 } 792 } else { 793 /* 794 * When denying unencrypted frames, discard 795 * any non-PAE frames received without encryption. 796 */ 797 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 798 (key == NULL && (m->m_flags & M_WEP) == 0) && 799 eh->ether_type != htons(ETHERTYPE_PAE)) { 800 /* 801 * Drop unencrypted frames. 802 */ 803 vap->iv_stats.is_rx_unencrypted++; 804 IEEE80211_NODE_STAT(ni, rx_unencrypted); 805 goto out; 806 } 807 } 808 /* XXX require HT? */ 809 if (qos & IEEE80211_QOS_AMSDU) { 810 m = ieee80211_decap_amsdu(ni, m); 811 if (m == NULL) 812 return IEEE80211_FC0_TYPE_DATA; 813 } else { 814 #ifdef IEEE80211_SUPPORT_SUPERG 815 m = ieee80211_decap_fastframe(vap, ni, m); 816 if (m == NULL) 817 return IEEE80211_FC0_TYPE_DATA; 818 #endif 819 } 820 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 821 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 822 else 823 hostap_deliver_data(vap, ni, m); 824 return IEEE80211_FC0_TYPE_DATA; 825 826 case IEEE80211_FC0_TYPE_MGT: 827 vap->iv_stats.is_rx_mgmt++; 828 IEEE80211_NODE_STAT(ni, rx_mgmt); 829 if (dir != IEEE80211_FC1_DIR_NODS) { 830 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 831 wh, "mgt", "incorrect dir 0x%x", dir); 832 vap->iv_stats.is_rx_wrongdir++; 833 goto err; 834 } 835 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 836 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 837 ni->ni_macaddr, "mgt", "too short: len %u", 838 m->m_pkthdr.len); 839 vap->iv_stats.is_rx_tooshort++; 840 goto out; 841 } 842 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 843 /* ensure return frames are unicast */ 844 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 845 wh, NULL, "source is multicast: %s", 846 ether_sprintf(wh->i_addr2)); 847 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 848 goto out; 849 } 850 #ifdef IEEE80211_DEBUG 851 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 852 ieee80211_msg_dumppkts(vap)) { 853 if_printf(ifp, "received %s from %s rssi %d\n", 854 ieee80211_mgt_subtype_name[subtype >> 855 IEEE80211_FC0_SUBTYPE_SHIFT], 856 ether_sprintf(wh->i_addr2), rssi); 857 } 858 #endif 859 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 860 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 861 /* 862 * Only shared key auth frames with a challenge 863 * should be encrypted, discard all others. 864 */ 865 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 866 wh, NULL, 867 "%s", "WEP set but not permitted"); 868 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 869 goto out; 870 } 871 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 872 /* 873 * Discard encrypted frames when privacy is off. 874 */ 875 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 876 wh, NULL, "%s", "WEP set but PRIVACY off"); 877 vap->iv_stats.is_rx_noprivacy++; 878 goto out; 879 } 880 hdrspace = ieee80211_hdrspace(ic, wh); 881 key = ieee80211_crypto_decap(ni, m, hdrspace); 882 if (key == NULL) { 883 /* NB: stats+msgs handled in crypto_decap */ 884 goto out; 885 } 886 wh = mtod(m, struct ieee80211_frame *); 887 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 888 } 889 /* 890 * Pass the packet to radiotap before calling iv_recv_mgmt(). 891 * Otherwise iv_recv_mgmt() might pass another packet to 892 * radiotap, resulting in out of order packet captures. 893 */ 894 if (ieee80211_radiotap_active_vap(vap)) 895 ieee80211_radiotap_rx(vap, m); 896 need_tap = 0; 897 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 898 goto out; 899 900 case IEEE80211_FC0_TYPE_CTL: 901 vap->iv_stats.is_rx_ctl++; 902 IEEE80211_NODE_STAT(ni, rx_ctrl); 903 vap->iv_recv_ctl(ni, m, subtype); 904 goto out; 905 default: 906 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 907 wh, "bad", "frame type 0x%x", type); 908 /* should not come here */ 909 break; 910 } 911 err: 912 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 913 out: 914 if (m != NULL) { 915 if (need_tap && ieee80211_radiotap_active_vap(vap)) 916 ieee80211_radiotap_rx(vap, m); 917 m_freem(m); 918 } 919 return type; 920 } 921 922 static void 923 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 924 int rssi, int nf, uint16_t seq, uint16_t status) 925 { 926 struct ieee80211vap *vap = ni->ni_vap; 927 928 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 929 930 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 931 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 932 ni->ni_macaddr, "open auth", 933 "bad sta auth mode %u", ni->ni_authmode); 934 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 935 /* 936 * Clear any challenge text that may be there if 937 * a previous shared key auth failed and then an 938 * open auth is attempted. 939 */ 940 if (ni->ni_challenge != NULL) { 941 free(ni->ni_challenge, M_80211_NODE); 942 ni->ni_challenge = NULL; 943 } 944 /* XXX hack to workaround calling convention */ 945 ieee80211_send_error(ni, wh->i_addr2, 946 IEEE80211_FC0_SUBTYPE_AUTH, 947 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 948 return; 949 } 950 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 951 vap->iv_stats.is_rx_bad_auth++; 952 return; 953 } 954 /* always accept open authentication requests */ 955 if (ni == vap->iv_bss) { 956 ni = ieee80211_dup_bss(vap, wh->i_addr2); 957 if (ni == NULL) 958 return; 959 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 960 (void) ieee80211_ref_node(ni); 961 /* 962 * Mark the node as referenced to reflect that it's 963 * reference count has been bumped to insure it remains 964 * after the transaction completes. 965 */ 966 ni->ni_flags |= IEEE80211_NODE_AREF; 967 /* 968 * Mark the node as requiring a valid association id 969 * before outbound traffic is permitted. 970 */ 971 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 972 973 if (vap->iv_acl != NULL && 974 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 975 /* 976 * When the ACL policy is set to RADIUS we defer the 977 * authorization to a user agent. Dispatch an event, 978 * a subsequent MLME call will decide the fate of the 979 * station. If the user agent is not present then the 980 * node will be reclaimed due to inactivity. 981 */ 982 IEEE80211_NOTE_MAC(vap, 983 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 984 "%s", "station authentication defered (radius acl)"); 985 ieee80211_notify_node_auth(ni); 986 } else { 987 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 988 IEEE80211_NOTE_MAC(vap, 989 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 990 "%s", "station authenticated (open)"); 991 /* 992 * When 802.1x is not in use mark the port 993 * authorized at this point so traffic can flow. 994 */ 995 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 996 ieee80211_node_authorize(ni); 997 } 998 } 999 1000 static void 1001 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1002 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1003 uint16_t seq, uint16_t status) 1004 { 1005 struct ieee80211vap *vap = ni->ni_vap; 1006 uint8_t *challenge; 1007 int allocbs, estatus; 1008 1009 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1010 1011 /* 1012 * NB: this can happen as we allow pre-shared key 1013 * authentication to be enabled w/o wep being turned 1014 * on so that configuration of these can be done 1015 * in any order. It may be better to enforce the 1016 * ordering in which case this check would just be 1017 * for sanity/consistency. 1018 */ 1019 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1020 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1021 ni->ni_macaddr, "shared key auth", 1022 "%s", " PRIVACY is disabled"); 1023 estatus = IEEE80211_STATUS_ALG; 1024 goto bad; 1025 } 1026 /* 1027 * Pre-shared key authentication is evil; accept 1028 * it only if explicitly configured (it is supported 1029 * mainly for compatibility with clients like Mac OS X). 1030 */ 1031 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1032 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1033 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1034 ni->ni_macaddr, "shared key auth", 1035 "bad sta auth mode %u", ni->ni_authmode); 1036 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1037 estatus = IEEE80211_STATUS_ALG; 1038 goto bad; 1039 } 1040 1041 challenge = NULL; 1042 if (frm + 1 < efrm) { 1043 if ((frm[1] + 2) > (efrm - frm)) { 1044 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1045 ni->ni_macaddr, "shared key auth", 1046 "ie %d/%d too long", 1047 frm[0], (frm[1] + 2) - (efrm - frm)); 1048 vap->iv_stats.is_rx_bad_auth++; 1049 estatus = IEEE80211_STATUS_CHALLENGE; 1050 goto bad; 1051 } 1052 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1053 challenge = frm; 1054 frm += frm[1] + 2; 1055 } 1056 switch (seq) { 1057 case IEEE80211_AUTH_SHARED_CHALLENGE: 1058 case IEEE80211_AUTH_SHARED_RESPONSE: 1059 if (challenge == NULL) { 1060 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1061 ni->ni_macaddr, "shared key auth", 1062 "%s", "no challenge"); 1063 vap->iv_stats.is_rx_bad_auth++; 1064 estatus = IEEE80211_STATUS_CHALLENGE; 1065 goto bad; 1066 } 1067 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1068 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1069 ni->ni_macaddr, "shared key auth", 1070 "bad challenge len %d", challenge[1]); 1071 vap->iv_stats.is_rx_bad_auth++; 1072 estatus = IEEE80211_STATUS_CHALLENGE; 1073 goto bad; 1074 } 1075 default: 1076 break; 1077 } 1078 switch (seq) { 1079 case IEEE80211_AUTH_SHARED_REQUEST: 1080 if (ni == vap->iv_bss) { 1081 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1082 if (ni == NULL) { 1083 /* NB: no way to return an error */ 1084 return; 1085 } 1086 allocbs = 1; 1087 } else { 1088 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1089 (void) ieee80211_ref_node(ni); 1090 allocbs = 0; 1091 } 1092 /* 1093 * Mark the node as referenced to reflect that it's 1094 * reference count has been bumped to insure it remains 1095 * after the transaction completes. 1096 */ 1097 ni->ni_flags |= IEEE80211_NODE_AREF; 1098 /* 1099 * Mark the node as requiring a valid associatio id 1100 * before outbound traffic is permitted. 1101 */ 1102 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1103 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1104 ni->ni_noise = nf; 1105 if (!ieee80211_alloc_challenge(ni)) { 1106 /* NB: don't return error so they rexmit */ 1107 return; 1108 } 1109 get_random_bytes(ni->ni_challenge, 1110 IEEE80211_CHALLENGE_LEN); 1111 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1112 ni, "shared key %sauth request", allocbs ? "" : "re"); 1113 /* 1114 * When the ACL policy is set to RADIUS we defer the 1115 * authorization to a user agent. Dispatch an event, 1116 * a subsequent MLME call will decide the fate of the 1117 * station. If the user agent is not present then the 1118 * node will be reclaimed due to inactivity. 1119 */ 1120 if (vap->iv_acl != NULL && 1121 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1122 IEEE80211_NOTE_MAC(vap, 1123 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1124 ni->ni_macaddr, 1125 "%s", "station authentication defered (radius acl)"); 1126 ieee80211_notify_node_auth(ni); 1127 return; 1128 } 1129 break; 1130 case IEEE80211_AUTH_SHARED_RESPONSE: 1131 if (ni == vap->iv_bss) { 1132 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1133 ni->ni_macaddr, "shared key response", 1134 "%s", "unknown station"); 1135 /* NB: don't send a response */ 1136 return; 1137 } 1138 if (ni->ni_challenge == NULL) { 1139 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1140 ni->ni_macaddr, "shared key response", 1141 "%s", "no challenge recorded"); 1142 vap->iv_stats.is_rx_bad_auth++; 1143 estatus = IEEE80211_STATUS_CHALLENGE; 1144 goto bad; 1145 } 1146 if (memcmp(ni->ni_challenge, &challenge[2], 1147 challenge[1]) != 0) { 1148 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1149 ni->ni_macaddr, "shared key response", 1150 "%s", "challenge mismatch"); 1151 vap->iv_stats.is_rx_auth_fail++; 1152 estatus = IEEE80211_STATUS_CHALLENGE; 1153 goto bad; 1154 } 1155 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1156 ni, "%s", "station authenticated (shared key)"); 1157 ieee80211_node_authorize(ni); 1158 break; 1159 default: 1160 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1161 ni->ni_macaddr, "shared key auth", 1162 "bad seq %d", seq); 1163 vap->iv_stats.is_rx_bad_auth++; 1164 estatus = IEEE80211_STATUS_SEQUENCE; 1165 goto bad; 1166 } 1167 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1168 return; 1169 bad: 1170 /* 1171 * Send an error response; but only when operating as an AP. 1172 */ 1173 /* XXX hack to workaround calling convention */ 1174 ieee80211_send_error(ni, wh->i_addr2, 1175 IEEE80211_FC0_SUBTYPE_AUTH, 1176 (seq + 1) | (estatus<<16)); 1177 } 1178 1179 /* 1180 * Convert a WPA cipher selector OUI to an internal 1181 * cipher algorithm. Where appropriate we also 1182 * record any key length. 1183 */ 1184 static int 1185 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1186 { 1187 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1188 uint32_t w = LE_READ_4(sel); 1189 1190 switch (w) { 1191 case WPA_SEL(WPA_CSE_NULL): 1192 return IEEE80211_CIPHER_NONE; 1193 case WPA_SEL(WPA_CSE_WEP40): 1194 if (keylen) 1195 *keylen = 40 / NBBY; 1196 return IEEE80211_CIPHER_WEP; 1197 case WPA_SEL(WPA_CSE_WEP104): 1198 if (keylen) 1199 *keylen = 104 / NBBY; 1200 return IEEE80211_CIPHER_WEP; 1201 case WPA_SEL(WPA_CSE_TKIP): 1202 return IEEE80211_CIPHER_TKIP; 1203 case WPA_SEL(WPA_CSE_CCMP): 1204 return IEEE80211_CIPHER_AES_CCM; 1205 } 1206 return 32; /* NB: so 1<< is discarded */ 1207 #undef WPA_SEL 1208 } 1209 1210 /* 1211 * Convert a WPA key management/authentication algorithm 1212 * to an internal code. 1213 */ 1214 static int 1215 wpa_keymgmt(const uint8_t *sel) 1216 { 1217 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1218 uint32_t w = LE_READ_4(sel); 1219 1220 switch (w) { 1221 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1222 return WPA_ASE_8021X_UNSPEC; 1223 case WPA_SEL(WPA_ASE_8021X_PSK): 1224 return WPA_ASE_8021X_PSK; 1225 case WPA_SEL(WPA_ASE_NONE): 1226 return WPA_ASE_NONE; 1227 } 1228 return 0; /* NB: so is discarded */ 1229 #undef WPA_SEL 1230 } 1231 1232 /* 1233 * Parse a WPA information element to collect parameters. 1234 * Note that we do not validate security parameters; that 1235 * is handled by the authenticator; the parsing done here 1236 * is just for internal use in making operational decisions. 1237 */ 1238 static int 1239 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1240 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1241 { 1242 uint8_t len = frm[1]; 1243 uint32_t w; 1244 int n; 1245 1246 /* 1247 * Check the length once for fixed parts: OUI, type, 1248 * version, mcast cipher, and 2 selector counts. 1249 * Other, variable-length data, must be checked separately. 1250 */ 1251 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1252 IEEE80211_DISCARD_IE(vap, 1253 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1254 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1255 return IEEE80211_REASON_IE_INVALID; 1256 } 1257 if (len < 14) { 1258 IEEE80211_DISCARD_IE(vap, 1259 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1260 wh, "WPA", "too short, len %u", len); 1261 return IEEE80211_REASON_IE_INVALID; 1262 } 1263 frm += 6, len -= 4; /* NB: len is payload only */ 1264 /* NB: iswpaoui already validated the OUI and type */ 1265 w = LE_READ_2(frm); 1266 if (w != WPA_VERSION) { 1267 IEEE80211_DISCARD_IE(vap, 1268 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1269 wh, "WPA", "bad version %u", w); 1270 return IEEE80211_REASON_IE_INVALID; 1271 } 1272 frm += 2, len -= 2; 1273 1274 memset(rsn, 0, sizeof(*rsn)); 1275 1276 /* multicast/group cipher */ 1277 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1278 frm += 4, len -= 4; 1279 1280 /* unicast ciphers */ 1281 n = LE_READ_2(frm); 1282 frm += 2, len -= 2; 1283 if (len < n*4+2) { 1284 IEEE80211_DISCARD_IE(vap, 1285 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1286 wh, "WPA", "ucast cipher 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 |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1293 frm += 4, len -= 4; 1294 } 1295 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1296 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1297 else 1298 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1299 1300 /* key management algorithms */ 1301 n = LE_READ_2(frm); 1302 frm += 2, len -= 2; 1303 if (len < n*4) { 1304 IEEE80211_DISCARD_IE(vap, 1305 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1306 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1307 len, n); 1308 return IEEE80211_REASON_IE_INVALID; 1309 } 1310 w = 0; 1311 for (; n > 0; n--) { 1312 w |= wpa_keymgmt(frm); 1313 frm += 4, len -= 4; 1314 } 1315 if (w & WPA_ASE_8021X_UNSPEC) 1316 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1317 else 1318 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1319 1320 if (len > 2) /* optional capabilities */ 1321 rsn->rsn_caps = LE_READ_2(frm); 1322 1323 return 0; 1324 } 1325 1326 /* 1327 * Convert an RSN cipher selector OUI to an internal 1328 * cipher algorithm. Where appropriate we also 1329 * record any key length. 1330 */ 1331 static int 1332 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1333 { 1334 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1335 uint32_t w = LE_READ_4(sel); 1336 1337 switch (w) { 1338 case RSN_SEL(RSN_CSE_NULL): 1339 return IEEE80211_CIPHER_NONE; 1340 case RSN_SEL(RSN_CSE_WEP40): 1341 if (keylen) 1342 *keylen = 40 / NBBY; 1343 return IEEE80211_CIPHER_WEP; 1344 case RSN_SEL(RSN_CSE_WEP104): 1345 if (keylen) 1346 *keylen = 104 / NBBY; 1347 return IEEE80211_CIPHER_WEP; 1348 case RSN_SEL(RSN_CSE_TKIP): 1349 return IEEE80211_CIPHER_TKIP; 1350 case RSN_SEL(RSN_CSE_CCMP): 1351 return IEEE80211_CIPHER_AES_CCM; 1352 case RSN_SEL(RSN_CSE_WRAP): 1353 return IEEE80211_CIPHER_AES_OCB; 1354 } 1355 return 32; /* NB: so 1<< is discarded */ 1356 #undef WPA_SEL 1357 } 1358 1359 /* 1360 * Convert an RSN key management/authentication algorithm 1361 * to an internal code. 1362 */ 1363 static int 1364 rsn_keymgmt(const uint8_t *sel) 1365 { 1366 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1367 uint32_t w = LE_READ_4(sel); 1368 1369 switch (w) { 1370 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1371 return RSN_ASE_8021X_UNSPEC; 1372 case RSN_SEL(RSN_ASE_8021X_PSK): 1373 return RSN_ASE_8021X_PSK; 1374 case RSN_SEL(RSN_ASE_NONE): 1375 return RSN_ASE_NONE; 1376 } 1377 return 0; /* NB: so is discarded */ 1378 #undef RSN_SEL 1379 } 1380 1381 /* 1382 * Parse a WPA/RSN information element to collect parameters 1383 * and validate the parameters against what has been 1384 * configured for the system. 1385 */ 1386 static int 1387 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1388 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1389 { 1390 uint8_t len = frm[1]; 1391 uint32_t w; 1392 int n; 1393 1394 /* 1395 * Check the length once for fixed parts: 1396 * version, mcast cipher, and 2 selector counts. 1397 * Other, variable-length data, must be checked separately. 1398 */ 1399 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1400 IEEE80211_DISCARD_IE(vap, 1401 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1402 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1403 return IEEE80211_REASON_IE_INVALID; 1404 } 1405 if (len < 10) { 1406 IEEE80211_DISCARD_IE(vap, 1407 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1408 wh, "RSN", "too short, len %u", len); 1409 return IEEE80211_REASON_IE_INVALID; 1410 } 1411 frm += 2; 1412 w = LE_READ_2(frm); 1413 if (w != RSN_VERSION) { 1414 IEEE80211_DISCARD_IE(vap, 1415 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1416 wh, "RSN", "bad version %u", w); 1417 return IEEE80211_REASON_IE_INVALID; 1418 } 1419 frm += 2, len -= 2; 1420 1421 memset(rsn, 0, sizeof(*rsn)); 1422 1423 /* multicast/group cipher */ 1424 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1425 frm += 4, len -= 4; 1426 1427 /* unicast ciphers */ 1428 n = LE_READ_2(frm); 1429 frm += 2, len -= 2; 1430 if (len < n*4+2) { 1431 IEEE80211_DISCARD_IE(vap, 1432 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1433 wh, "RSN", "ucast cipher 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 |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1440 frm += 4, len -= 4; 1441 } 1442 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1443 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1444 else 1445 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1446 1447 /* key management algorithms */ 1448 n = LE_READ_2(frm); 1449 frm += 2, len -= 2; 1450 if (len < n*4) { 1451 IEEE80211_DISCARD_IE(vap, 1452 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1453 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1454 len, n); 1455 return IEEE80211_REASON_IE_INVALID; 1456 } 1457 w = 0; 1458 for (; n > 0; n--) { 1459 w |= rsn_keymgmt(frm); 1460 frm += 4, len -= 4; 1461 } 1462 if (w & RSN_ASE_8021X_UNSPEC) 1463 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1464 else 1465 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1466 1467 /* optional RSN capabilities */ 1468 if (len > 2) 1469 rsn->rsn_caps = LE_READ_2(frm); 1470 /* XXXPMKID */ 1471 1472 return 0; 1473 } 1474 1475 /* 1476 * WPA/802.11i assocation request processing. 1477 */ 1478 static int 1479 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1480 const struct ieee80211_frame *wh, const uint8_t *wpa, 1481 const uint8_t *rsn, uint16_t capinfo) 1482 { 1483 struct ieee80211vap *vap = ni->ni_vap; 1484 uint8_t reason; 1485 int badwparsn; 1486 1487 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1488 if (wpa == NULL && rsn == NULL) { 1489 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1490 /* 1491 * W-Fi Protected Setup (WPS) permits 1492 * clients to associate and pass EAPOL frames 1493 * to establish initial credentials. 1494 */ 1495 ni->ni_flags |= IEEE80211_NODE_WPS; 1496 return 1; 1497 } 1498 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1499 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1500 /* 1501 * Transitional Security Network. Permits clients 1502 * to associate and use WEP while WPA is configured. 1503 */ 1504 ni->ni_flags |= IEEE80211_NODE_TSN; 1505 return 1; 1506 } 1507 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1508 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1509 vap->iv_stats.is_rx_assoc_badwpaie++; 1510 reason = IEEE80211_REASON_IE_INVALID; 1511 goto bad; 1512 } 1513 /* assert right association security credentials */ 1514 badwparsn = 0; /* NB: to silence compiler */ 1515 switch (vap->iv_flags & IEEE80211_F_WPA) { 1516 case IEEE80211_F_WPA1: 1517 badwparsn = (wpa == NULL); 1518 break; 1519 case IEEE80211_F_WPA2: 1520 badwparsn = (rsn == NULL); 1521 break; 1522 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1523 badwparsn = (wpa == NULL && rsn == NULL); 1524 break; 1525 } 1526 if (badwparsn) { 1527 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1528 wh, NULL, 1529 "%s", "missing WPA/RSN IE in association request"); 1530 vap->iv_stats.is_rx_assoc_badwpaie++; 1531 reason = IEEE80211_REASON_IE_INVALID; 1532 goto bad; 1533 } 1534 /* 1535 * Parse WPA/RSN information element. 1536 */ 1537 if (wpa != NULL) 1538 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1539 else 1540 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1541 if (reason != 0) { 1542 /* XXX distinguish WPA/RSN? */ 1543 vap->iv_stats.is_rx_assoc_badwpaie++; 1544 goto bad; 1545 } 1546 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1547 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1548 wpa != NULL ? "WPA" : "RSN", 1549 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1550 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1551 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1552 1553 return 1; 1554 bad: 1555 ieee80211_node_deauth(ni, reason); 1556 return 0; 1557 } 1558 1559 /* XXX find a better place for definition */ 1560 struct l2_update_frame { 1561 struct ether_header eh; 1562 uint8_t dsap; 1563 uint8_t ssap; 1564 uint8_t control; 1565 uint8_t xid[3]; 1566 } __packed; 1567 1568 /* 1569 * Deliver a TGf L2UF frame on behalf of a station. 1570 * This primes any bridge when the station is roaming 1571 * between ap's on the same wired network. 1572 */ 1573 static void 1574 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1575 { 1576 struct ieee80211vap *vap = ni->ni_vap; 1577 struct ifnet *ifp = vap->iv_ifp; 1578 struct mbuf *m; 1579 struct l2_update_frame *l2uf; 1580 struct ether_header *eh; 1581 1582 m = m_gethdr(M_NOWAIT, MT_DATA); 1583 if (m == NULL) { 1584 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1585 "%s", "no mbuf for l2uf frame"); 1586 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1587 return; 1588 } 1589 l2uf = mtod(m, struct l2_update_frame *); 1590 eh = &l2uf->eh; 1591 /* dst: Broadcast address */ 1592 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1593 /* src: associated STA */ 1594 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1595 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1596 1597 l2uf->dsap = 0; 1598 l2uf->ssap = 0; 1599 l2uf->control = 0xf5; 1600 l2uf->xid[0] = 0x81; 1601 l2uf->xid[1] = 0x80; 1602 l2uf->xid[2] = 0x00; 1603 1604 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1605 hostap_deliver_data(vap, ni, m); 1606 } 1607 1608 static void 1609 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1610 int reassoc, int resp, const char *tag, int rate) 1611 { 1612 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1613 "deny %s request, %s rate set mismatch, rate/MCS %d", 1614 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1615 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1616 ieee80211_node_leave(ni); 1617 } 1618 1619 static void 1620 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1621 int reassoc, int resp, const char *tag, int capinfo) 1622 { 1623 struct ieee80211vap *vap = ni->ni_vap; 1624 1625 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1626 "deny %s request, %s mismatch 0x%x", 1627 reassoc ? "reassoc" : "assoc", tag, capinfo); 1628 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1629 ieee80211_node_leave(ni); 1630 vap->iv_stats.is_rx_assoc_capmismatch++; 1631 } 1632 1633 static void 1634 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1635 int reassoc, int resp) 1636 { 1637 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1638 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1639 /* XXX no better code */ 1640 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1641 ieee80211_node_leave(ni); 1642 } 1643 1644 static void 1645 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1646 int algo, int seq, int status) 1647 { 1648 struct ieee80211vap *vap = ni->ni_vap; 1649 1650 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1651 wh, NULL, "unsupported alg %d", algo); 1652 vap->iv_stats.is_rx_auth_unsupported++; 1653 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1654 seq | (status << 16)); 1655 } 1656 1657 static __inline int 1658 ishtmixed(const uint8_t *ie) 1659 { 1660 const struct ieee80211_ie_htinfo *ht = 1661 (const struct ieee80211_ie_htinfo *) ie; 1662 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1663 IEEE80211_HTINFO_OPMODE_MIXED; 1664 } 1665 1666 static int 1667 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1668 { 1669 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1670 int i; 1671 1672 /* NB: the 11b clients we care about will not have xrates */ 1673 if (xrates != NULL || rates == NULL) 1674 return 0; 1675 for (i = 0; i < rates[1]; i++) { 1676 int r = rates[2+i] & IEEE80211_RATE_VAL; 1677 if (r > 2*11 || ((1<<r) & brates) == 0) 1678 return 0; 1679 } 1680 return 1; 1681 } 1682 1683 static void 1684 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1685 int subtype, int rssi, int nf) 1686 { 1687 struct ieee80211vap *vap = ni->ni_vap; 1688 struct ieee80211com *ic = ni->ni_ic; 1689 struct ieee80211_frame *wh; 1690 uint8_t *frm, *efrm, *sfrm; 1691 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1692 int reassoc, resp; 1693 uint8_t rate; 1694 1695 wh = mtod(m0, struct ieee80211_frame *); 1696 frm = (uint8_t *)&wh[1]; 1697 efrm = mtod(m0, uint8_t *) + m0->m_len; 1698 switch (subtype) { 1699 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1700 case IEEE80211_FC0_SUBTYPE_BEACON: { 1701 struct ieee80211_scanparams scan; 1702 /* 1703 * We process beacon/probe response frames when scanning; 1704 * otherwise we check beacon frames for overlapping non-ERP 1705 * BSS in 11g and/or overlapping legacy BSS when in HT. 1706 */ 1707 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1708 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1709 vap->iv_stats.is_rx_mgtdiscard++; 1710 return; 1711 } 1712 /* NB: accept off-channel frames */ 1713 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1714 return; 1715 /* 1716 * Count frame now that we know it's to be processed. 1717 */ 1718 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1719 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1720 IEEE80211_NODE_STAT(ni, rx_beacons); 1721 } else 1722 IEEE80211_NODE_STAT(ni, rx_proberesp); 1723 /* 1724 * If scanning, just pass information to the scan module. 1725 */ 1726 if (ic->ic_flags & IEEE80211_F_SCAN) { 1727 if (scan.status == 0 && /* NB: on channel */ 1728 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1729 /* 1730 * Actively scanning a channel marked passive; 1731 * send a probe request now that we know there 1732 * is 802.11 traffic present. 1733 * 1734 * XXX check if the beacon we recv'd gives 1735 * us what we need and suppress the probe req 1736 */ 1737 ieee80211_probe_curchan(vap, 1); 1738 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1739 } 1740 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1741 return; 1742 } 1743 /* 1744 * Check beacon for overlapping bss w/ non ERP stations. 1745 * If we detect one and protection is configured but not 1746 * enabled, enable it and start a timer that'll bring us 1747 * out if we stop seeing the bss. 1748 */ 1749 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1750 scan.status == 0 && /* NB: on-channel */ 1751 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1752 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1753 ic->ic_lastnonerp = ticks; 1754 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1755 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1756 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1757 IEEE80211_NOTE_FRAME(vap, 1758 IEEE80211_MSG_ASSOC, wh, 1759 "non-ERP present on channel %d " 1760 "(saw erp 0x%x from channel %d), " 1761 "enable use of protection", 1762 ic->ic_curchan->ic_ieee, 1763 scan.erp, scan.chan); 1764 ic->ic_flags |= IEEE80211_F_USEPROT; 1765 ieee80211_notify_erp(ic); 1766 } 1767 } 1768 /* 1769 * Check beacon for non-HT station on HT channel 1770 * and update HT BSS occupancy as appropriate. 1771 */ 1772 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1773 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1774 /* 1775 * Off control channel; only check frames 1776 * that come in the extension channel when 1777 * operating w/ HT40. 1778 */ 1779 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1780 break; 1781 if (scan.chan != ic->ic_curchan->ic_extieee) 1782 break; 1783 } 1784 if (scan.htinfo == NULL) { 1785 ieee80211_htprot_update(ic, 1786 IEEE80211_HTINFO_OPMODE_PROTOPT | 1787 IEEE80211_HTINFO_NONHT_PRESENT); 1788 } else if (ishtmixed(scan.htinfo)) { 1789 /* XXX? take NONHT_PRESENT from beacon? */ 1790 ieee80211_htprot_update(ic, 1791 IEEE80211_HTINFO_OPMODE_MIXED | 1792 IEEE80211_HTINFO_NONHT_PRESENT); 1793 } 1794 } 1795 break; 1796 } 1797 1798 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1799 if (vap->iv_state != IEEE80211_S_RUN) { 1800 vap->iv_stats.is_rx_mgtdiscard++; 1801 return; 1802 } 1803 /* 1804 * Consult the ACL policy module if setup. 1805 */ 1806 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1807 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1808 wh, NULL, "%s", "disallowed by ACL"); 1809 vap->iv_stats.is_rx_acl++; 1810 return; 1811 } 1812 /* 1813 * prreq frame format 1814 * [tlv] ssid 1815 * [tlv] supported rates 1816 * [tlv] extended supported rates 1817 */ 1818 ssid = rates = xrates = NULL; 1819 sfrm = frm; 1820 while (efrm - frm > 1) { 1821 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1822 switch (*frm) { 1823 case IEEE80211_ELEMID_SSID: 1824 ssid = frm; 1825 break; 1826 case IEEE80211_ELEMID_RATES: 1827 rates = frm; 1828 break; 1829 case IEEE80211_ELEMID_XRATES: 1830 xrates = frm; 1831 break; 1832 } 1833 frm += frm[1] + 2; 1834 } 1835 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1836 if (xrates != NULL) 1837 IEEE80211_VERIFY_ELEMENT(xrates, 1838 IEEE80211_RATE_MAXSIZE - rates[1], return); 1839 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1840 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1841 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1842 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1843 wh, NULL, 1844 "%s", "no ssid with ssid suppression enabled"); 1845 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1846 return; 1847 } 1848 1849 /* XXX find a better class or define it's own */ 1850 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1851 "%s", "recv probe req"); 1852 /* 1853 * Some legacy 11b clients cannot hack a complete 1854 * probe response frame. When the request includes 1855 * only a bare-bones rate set, communicate this to 1856 * the transmit side. 1857 */ 1858 ieee80211_send_proberesp(vap, wh->i_addr2, 1859 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1860 break; 1861 1862 case IEEE80211_FC0_SUBTYPE_AUTH: { 1863 uint16_t algo, seq, status; 1864 1865 if (vap->iv_state != IEEE80211_S_RUN) { 1866 vap->iv_stats.is_rx_mgtdiscard++; 1867 return; 1868 } 1869 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1870 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1871 wh, NULL, "%s", "wrong bssid"); 1872 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1873 return; 1874 } 1875 /* 1876 * auth frame format 1877 * [2] algorithm 1878 * [2] sequence 1879 * [2] status 1880 * [tlv*] challenge 1881 */ 1882 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1883 algo = le16toh(*(uint16_t *)frm); 1884 seq = le16toh(*(uint16_t *)(frm + 2)); 1885 status = le16toh(*(uint16_t *)(frm + 4)); 1886 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1887 "recv auth frame with algorithm %d seq %d", algo, seq); 1888 /* 1889 * Consult the ACL policy module if setup. 1890 */ 1891 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1892 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1893 wh, NULL, "%s", "disallowed by ACL"); 1894 vap->iv_stats.is_rx_acl++; 1895 ieee80211_send_error(ni, wh->i_addr2, 1896 IEEE80211_FC0_SUBTYPE_AUTH, 1897 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1898 return; 1899 } 1900 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1901 IEEE80211_DISCARD(vap, 1902 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1903 wh, NULL, "%s", "TKIP countermeasures enabled"); 1904 vap->iv_stats.is_rx_auth_countermeasures++; 1905 ieee80211_send_error(ni, wh->i_addr2, 1906 IEEE80211_FC0_SUBTYPE_AUTH, 1907 IEEE80211_REASON_MIC_FAILURE); 1908 return; 1909 } 1910 if (algo == IEEE80211_AUTH_ALG_SHARED) 1911 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1912 seq, status); 1913 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1914 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1915 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1916 authalgreject(ni, wh, algo, 1917 seq+1, IEEE80211_STATUS_ALG); 1918 return; 1919 } else { 1920 /* 1921 * We assume that an unknown algorithm is the result 1922 * of a decryption failure on a shared key auth frame; 1923 * return a status code appropriate for that instead 1924 * of IEEE80211_STATUS_ALG. 1925 * 1926 * NB: a seq# of 4 is intentional; the decrypted 1927 * frame likely has a bogus seq value. 1928 */ 1929 authalgreject(ni, wh, algo, 1930 4, IEEE80211_STATUS_CHALLENGE); 1931 return; 1932 } 1933 break; 1934 } 1935 1936 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1937 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1938 uint16_t capinfo, lintval; 1939 struct ieee80211_rsnparms rsnparms; 1940 1941 if (vap->iv_state != IEEE80211_S_RUN) { 1942 vap->iv_stats.is_rx_mgtdiscard++; 1943 return; 1944 } 1945 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1946 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1947 wh, NULL, "%s", "wrong bssid"); 1948 vap->iv_stats.is_rx_assoc_bss++; 1949 return; 1950 } 1951 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1952 reassoc = 1; 1953 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1954 } else { 1955 reassoc = 0; 1956 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1957 } 1958 if (ni == vap->iv_bss) { 1959 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1960 "deny %s request, sta not authenticated", 1961 reassoc ? "reassoc" : "assoc"); 1962 ieee80211_send_error(ni, wh->i_addr2, 1963 IEEE80211_FC0_SUBTYPE_DEAUTH, 1964 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1965 vap->iv_stats.is_rx_assoc_notauth++; 1966 return; 1967 } 1968 1969 /* 1970 * asreq frame format 1971 * [2] capability information 1972 * [2] listen interval 1973 * [6*] current AP address (reassoc only) 1974 * [tlv] ssid 1975 * [tlv] supported rates 1976 * [tlv] extended supported rates 1977 * [tlv] WPA or RSN 1978 * [tlv] HT capabilities 1979 * [tlv] Atheros capabilities 1980 */ 1981 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1982 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1983 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1984 if (reassoc) 1985 frm += 6; /* ignore current AP info */ 1986 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1987 sfrm = frm; 1988 while (efrm - frm > 1) { 1989 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1990 switch (*frm) { 1991 case IEEE80211_ELEMID_SSID: 1992 ssid = frm; 1993 break; 1994 case IEEE80211_ELEMID_RATES: 1995 rates = frm; 1996 break; 1997 case IEEE80211_ELEMID_XRATES: 1998 xrates = frm; 1999 break; 2000 case IEEE80211_ELEMID_RSN: 2001 rsn = frm; 2002 break; 2003 case IEEE80211_ELEMID_HTCAP: 2004 htcap = frm; 2005 break; 2006 case IEEE80211_ELEMID_VENDOR: 2007 if (iswpaoui(frm)) 2008 wpa = frm; 2009 else if (iswmeinfo(frm)) 2010 wme = frm; 2011 #ifdef IEEE80211_SUPPORT_SUPERG 2012 else if (isatherosoui(frm)) 2013 ath = frm; 2014 #endif 2015 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2016 if (ishtcapoui(frm) && htcap == NULL) 2017 htcap = frm; 2018 } 2019 break; 2020 } 2021 frm += frm[1] + 2; 2022 } 2023 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2024 if (xrates != NULL) 2025 IEEE80211_VERIFY_ELEMENT(xrates, 2026 IEEE80211_RATE_MAXSIZE - rates[1], return); 2027 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2028 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2029 if (htcap != NULL) { 2030 IEEE80211_VERIFY_LENGTH(htcap[1], 2031 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2032 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2033 sizeof(struct ieee80211_ie_htcap)-2, 2034 return); /* XXX just NULL out? */ 2035 } 2036 2037 if ((vap->iv_flags & IEEE80211_F_WPA) && 2038 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2039 return; 2040 /* discard challenge after association */ 2041 if (ni->ni_challenge != NULL) { 2042 free(ni->ni_challenge, M_80211_NODE); 2043 ni->ni_challenge = NULL; 2044 } 2045 /* NB: 802.11 spec says to ignore station's privacy bit */ 2046 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2047 capinfomismatch(ni, wh, reassoc, resp, 2048 "capability", capinfo); 2049 return; 2050 } 2051 /* 2052 * Disallow re-associate w/ invalid slot time setting. 2053 */ 2054 if (ni->ni_associd != 0 && 2055 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2056 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2057 capinfomismatch(ni, wh, reassoc, resp, 2058 "slot time", capinfo); 2059 return; 2060 } 2061 rate = ieee80211_setup_rates(ni, rates, xrates, 2062 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2063 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2064 if (rate & IEEE80211_RATE_BASIC) { 2065 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2066 vap->iv_stats.is_rx_assoc_norate++; 2067 return; 2068 } 2069 /* 2070 * If constrained to 11g-only stations reject an 2071 * 11b-only station. We cheat a bit here by looking 2072 * at the max negotiated xmit rate and assuming anyone 2073 * with a best rate <24Mb/s is an 11b station. 2074 */ 2075 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2076 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2077 vap->iv_stats.is_rx_assoc_norate++; 2078 return; 2079 } 2080 /* 2081 * Do HT rate set handling and setup HT node state. 2082 */ 2083 ni->ni_chan = vap->iv_bss->ni_chan; 2084 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2085 rate = ieee80211_setup_htrates(ni, htcap, 2086 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2087 IEEE80211_F_DOBRS); 2088 if (rate & IEEE80211_RATE_BASIC) { 2089 ratesetmismatch(ni, wh, reassoc, resp, 2090 "HT", rate); 2091 vap->iv_stats.is_ht_assoc_norate++; 2092 return; 2093 } 2094 ieee80211_ht_node_init(ni); 2095 ieee80211_ht_updatehtcap(ni, htcap); 2096 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2097 ieee80211_ht_node_cleanup(ni); 2098 #ifdef IEEE80211_SUPPORT_SUPERG 2099 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2100 ieee80211_ff_node_cleanup(ni); 2101 #endif 2102 /* 2103 * Allow AMPDU operation only with unencrypted traffic 2104 * or AES-CCM; the 11n spec only specifies these ciphers 2105 * so permitting any others is undefined and can lead 2106 * to interoperability problems. 2107 */ 2108 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2109 (((vap->iv_flags & IEEE80211_F_WPA) && 2110 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2111 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2112 IEEE80211_NOTE(vap, 2113 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2114 "disallow HT use because WEP or TKIP requested, " 2115 "capinfo 0x%x ucastcipher %d", capinfo, 2116 rsnparms.rsn_ucastcipher); 2117 ieee80211_ht_node_cleanup(ni); 2118 vap->iv_stats.is_ht_assoc_downgrade++; 2119 } 2120 /* 2121 * If constrained to 11n-only stations reject legacy stations. 2122 */ 2123 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2124 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2125 htcapmismatch(ni, wh, reassoc, resp); 2126 vap->iv_stats.is_ht_assoc_nohtcap++; 2127 return; 2128 } 2129 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2130 ni->ni_noise = nf; 2131 ni->ni_intval = lintval; 2132 ni->ni_capinfo = capinfo; 2133 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2134 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2135 /* 2136 * Store the IEs. 2137 * XXX maybe better to just expand 2138 */ 2139 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2140 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2141 if (wpa != NULL) 2142 setie(wpa_ie, wpa - sfrm); 2143 if (rsn != NULL) 2144 setie(rsn_ie, rsn - sfrm); 2145 if (htcap != NULL) 2146 setie(htcap_ie, htcap - sfrm); 2147 if (wme != NULL) { 2148 setie(wme_ie, wme - sfrm); 2149 /* 2150 * Mark node as capable of QoS. 2151 */ 2152 ni->ni_flags |= IEEE80211_NODE_QOS; 2153 } else 2154 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2155 #ifdef IEEE80211_SUPPORT_SUPERG 2156 if (ath != NULL) { 2157 setie(ath_ie, ath - sfrm); 2158 /* 2159 * Parse ATH station parameters. 2160 */ 2161 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2162 } else 2163 #endif 2164 ni->ni_ath_flags = 0; 2165 #undef setie 2166 } else { 2167 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2168 ni->ni_ath_flags = 0; 2169 } 2170 ieee80211_node_join(ni, resp); 2171 ieee80211_deliver_l2uf(ni); 2172 break; 2173 } 2174 2175 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2176 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2177 uint16_t reason; 2178 2179 if (vap->iv_state != IEEE80211_S_RUN || 2180 /* NB: can happen when in promiscuous mode */ 2181 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2182 vap->iv_stats.is_rx_mgtdiscard++; 2183 break; 2184 } 2185 /* 2186 * deauth/disassoc frame format 2187 * [2] reason 2188 */ 2189 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2190 reason = le16toh(*(uint16_t *)frm); 2191 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2192 vap->iv_stats.is_rx_deauth++; 2193 IEEE80211_NODE_STAT(ni, rx_deauth); 2194 } else { 2195 vap->iv_stats.is_rx_disassoc++; 2196 IEEE80211_NODE_STAT(ni, rx_disassoc); 2197 } 2198 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2199 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2200 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2201 if (ni != vap->iv_bss) 2202 ieee80211_node_leave(ni); 2203 break; 2204 } 2205 2206 case IEEE80211_FC0_SUBTYPE_ACTION: 2207 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2208 if (ni == vap->iv_bss) { 2209 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2210 wh, NULL, "%s", "unknown node"); 2211 vap->iv_stats.is_rx_mgtdiscard++; 2212 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2213 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2214 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2215 wh, NULL, "%s", "not for us"); 2216 vap->iv_stats.is_rx_mgtdiscard++; 2217 } else if (vap->iv_state != IEEE80211_S_RUN) { 2218 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2219 wh, NULL, "wrong state %s", 2220 ieee80211_state_name[vap->iv_state]); 2221 vap->iv_stats.is_rx_mgtdiscard++; 2222 } else { 2223 if (ieee80211_parse_action(ni, m0) == 0) 2224 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2225 } 2226 break; 2227 2228 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2229 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2230 case IEEE80211_FC0_SUBTYPE_ATIM: 2231 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2232 wh, NULL, "%s", "not handled"); 2233 vap->iv_stats.is_rx_mgtdiscard++; 2234 break; 2235 2236 default: 2237 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2238 wh, "mgt", "subtype 0x%x not handled", subtype); 2239 vap->iv_stats.is_rx_badsubtype++; 2240 break; 2241 } 2242 } 2243 2244 static void 2245 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2246 { 2247 switch (subtype) { 2248 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2249 ni->ni_vap->iv_recv_pspoll(ni, m); 2250 break; 2251 case IEEE80211_FC0_SUBTYPE_BAR: 2252 ieee80211_recv_bar(ni, m); 2253 break; 2254 } 2255 } 2256 2257 /* 2258 * Process a received ps-poll frame. 2259 */ 2260 void 2261 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2262 { 2263 struct ieee80211vap *vap = ni->ni_vap; 2264 struct ieee80211com *ic = vap->iv_ic; 2265 struct ieee80211_frame_min *wh; 2266 struct mbuf *m; 2267 uint16_t aid; 2268 int qlen; 2269 2270 wh = mtod(m0, struct ieee80211_frame_min *); 2271 if (ni->ni_associd == 0) { 2272 IEEE80211_DISCARD(vap, 2273 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2274 (struct ieee80211_frame *) wh, NULL, 2275 "%s", "unassociated station"); 2276 vap->iv_stats.is_ps_unassoc++; 2277 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2278 IEEE80211_REASON_NOT_ASSOCED); 2279 return; 2280 } 2281 2282 aid = le16toh(*(uint16_t *)wh->i_dur); 2283 if (aid != ni->ni_associd) { 2284 IEEE80211_DISCARD(vap, 2285 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2286 (struct ieee80211_frame *) wh, NULL, 2287 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2288 ni->ni_associd, aid); 2289 vap->iv_stats.is_ps_badaid++; 2290 /* 2291 * NB: We used to deauth the station but it turns out 2292 * the Blackberry Curve 8230 (and perhaps other devices) 2293 * sometimes send the wrong AID when WME is negotiated. 2294 * Being more lenient here seems ok as we already check 2295 * the station is associated and we only return frames 2296 * queued for the station (i.e. we don't use the AID). 2297 */ 2298 return; 2299 } 2300 2301 /* Okay, take the first queued packet and put it out... */ 2302 m = ieee80211_node_psq_dequeue(ni, &qlen); 2303 if (m == NULL) { 2304 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2305 "%s", "recv ps-poll, but queue empty"); 2306 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2307 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2308 if (vap->iv_set_tim != NULL) 2309 vap->iv_set_tim(ni, 0); /* just in case */ 2310 return; 2311 } 2312 /* 2313 * If there are more packets, set the more packets bit 2314 * in the packet dispatched to the station; otherwise 2315 * turn off the TIM bit. 2316 */ 2317 if (qlen != 0) { 2318 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2319 "recv ps-poll, send packet, %u still queued", qlen); 2320 m->m_flags |= M_MORE_DATA; 2321 } else { 2322 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2323 "%s", "recv ps-poll, send packet, queue empty"); 2324 if (vap->iv_set_tim != NULL) 2325 vap->iv_set_tim(ni, 0); 2326 } 2327 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2328 2329 /* 2330 * Do the right thing; if it's an encap'ed frame then 2331 * call ieee80211_parent_xmitpkt() (and free the ref) else 2332 * call ieee80211_vap_xmitpkt(). 2333 */ 2334 if (m->m_flags & M_ENCAP) { 2335 if (ieee80211_parent_xmitpkt(ic, m) != 0) 2336 ieee80211_free_node(ni); 2337 } else { 2338 (void) ieee80211_vap_xmitpkt(vap, m); 2339 } 2340 } 2341