ieee80211_hostap.c revision 283535
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: head/sys/net80211/ieee80211_hostap.c 283535 2015-05-25 16:37:41Z adrian $"); 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 68static void hostap_vattach(struct ieee80211vap *); 69static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 71 const struct ieee80211_rx_stats *, 72 int rssi, int nf); 73static void hostap_deliver_data(struct ieee80211vap *, 74 struct ieee80211_node *, struct mbuf *); 75static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf); 77static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 78 79void 80ieee80211_hostap_attach(struct ieee80211com *ic) 81{ 82 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 83} 84 85void 86ieee80211_hostap_detach(struct ieee80211com *ic) 87{ 88} 89 90static void 91hostap_vdetach(struct ieee80211vap *vap) 92{ 93} 94 95static void 96hostap_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 107static void 108sta_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 119static void 120sta_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 132static void 133sta_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 */ 146static int 147isbandchange(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 */ 157static int 158hostap_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 352static void 353hostap_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#if __FreeBSD_version >= 1000046 361 m->m_flags &= ~(M_MCAST | M_BCAST); 362 m_clrprotoflags(m); 363#else 364 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 365#endif 366 367 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 368 ("gack, opmode %d", vap->iv_opmode)); 369 /* 370 * Do accounting. 371 */ 372 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 373 IEEE80211_NODE_STAT(ni, rx_data); 374 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 375 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 376 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 377 IEEE80211_NODE_STAT(ni, rx_mcast); 378 } else 379 IEEE80211_NODE_STAT(ni, rx_ucast); 380 381 /* perform as a bridge within the AP */ 382 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 383 struct mbuf *mcopy = NULL; 384 385 if (m->m_flags & M_MCAST) { 386 mcopy = m_dup(m, M_NOWAIT); 387 if (mcopy == NULL) 388 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 389 else 390 mcopy->m_flags |= M_MCAST; 391 } else { 392 /* 393 * Check if the destination is associated with the 394 * same vap and authorized to receive traffic. 395 * Beware of traffic destined for the vap itself; 396 * sending it will not work; just let it be delivered 397 * normally. 398 */ 399 struct ieee80211_node *sta = ieee80211_find_vap_node( 400 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 401 if (sta != NULL) { 402 if (ieee80211_node_is_authorized(sta)) { 403 /* 404 * Beware of sending to ourself; this 405 * needs to happen via the normal 406 * input path. 407 */ 408 if (sta != vap->iv_bss) { 409 mcopy = m; 410 m = NULL; 411 } 412 } else { 413 vap->iv_stats.is_rx_unauth++; 414 IEEE80211_NODE_STAT(sta, rx_unauth); 415 } 416 ieee80211_free_node(sta); 417 } 418 } 419 if (mcopy != NULL) { 420 int len, err; 421 len = mcopy->m_pkthdr.len; 422 err = ieee80211_vap_xmitpkt(vap, mcopy); 423 if (err) { 424 /* NB: IFQ_HANDOFF reclaims mcopy */ 425 } else { 426 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 427 } 428 } 429 } 430 if (m != NULL) { 431 /* 432 * Mark frame as coming from vap's interface. 433 */ 434 m->m_pkthdr.rcvif = ifp; 435 if (m->m_flags & M_MCAST) { 436 /* 437 * Spam DWDS vap's w/ multicast traffic. 438 */ 439 /* XXX only if dwds in use? */ 440 ieee80211_dwds_mcast(vap, m); 441 } 442 if (ni->ni_vlan != 0) { 443 /* attach vlan tag */ 444 m->m_pkthdr.ether_vtag = ni->ni_vlan; 445 m->m_flags |= M_VLANTAG; 446 } 447 ifp->if_input(ifp, m); 448 } 449} 450 451/* 452 * Decide if a received management frame should be 453 * printed when debugging is enabled. This filters some 454 * of the less interesting frames that come frequently 455 * (e.g. beacons). 456 */ 457static __inline int 458doprint(struct ieee80211vap *vap, int subtype) 459{ 460 switch (subtype) { 461 case IEEE80211_FC0_SUBTYPE_BEACON: 462 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 463 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 464 return 0; 465 } 466 return 1; 467} 468 469/* 470 * Process a received frame. The node associated with the sender 471 * should be supplied. If nothing was found in the node table then 472 * the caller is assumed to supply a reference to iv_bss instead. 473 * The RSSI and a timestamp are also supplied. The RSSI data is used 474 * during AP scanning to select a AP to associate with; it can have 475 * any units so long as values have consistent units and higher values 476 * mean ``better signal''. The receive timestamp is currently not used 477 * by the 802.11 layer. 478 */ 479static int 480hostap_input(struct ieee80211_node *ni, struct mbuf *m, 481 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 482{ 483 struct ieee80211vap *vap = ni->ni_vap; 484 struct ieee80211com *ic = ni->ni_ic; 485 struct ifnet *ifp = vap->iv_ifp; 486 struct ieee80211_frame *wh; 487 struct ieee80211_key *key; 488 struct ether_header *eh; 489 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 490 uint8_t dir, type, subtype, qos; 491 uint8_t *bssid; 492 uint16_t rxseq; 493 494 if (m->m_flags & M_AMPDU_MPDU) { 495 /* 496 * Fastpath for A-MPDU reorder q resubmission. Frames 497 * w/ M_AMPDU_MPDU marked have already passed through 498 * here but were received out of order and been held on 499 * the reorder queue. When resubmitted they are marked 500 * with the M_AMPDU_MPDU flag and we can bypass most of 501 * the normal processing. 502 */ 503 wh = mtod(m, struct ieee80211_frame *); 504 type = IEEE80211_FC0_TYPE_DATA; 505 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 506 subtype = IEEE80211_FC0_SUBTYPE_QOS; 507 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 508 goto resubmit_ampdu; 509 } 510 511 KASSERT(ni != NULL, ("null node")); 512 ni->ni_inact = ni->ni_inact_reload; 513 514 type = -1; /* undefined */ 515 516 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 517 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 518 ni->ni_macaddr, NULL, 519 "too short (1): len %u", m->m_pkthdr.len); 520 vap->iv_stats.is_rx_tooshort++; 521 goto out; 522 } 523 /* 524 * Bit of a cheat here, we use a pointer for a 3-address 525 * frame format but don't reference fields past outside 526 * ieee80211_frame_min w/o first validating the data is 527 * present. 528 */ 529 wh = mtod(m, struct ieee80211_frame *); 530 531 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 532 IEEE80211_FC0_VERSION_0) { 533 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 534 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 535 wh->i_fc[0], wh->i_fc[1]); 536 vap->iv_stats.is_rx_badversion++; 537 goto err; 538 } 539 540 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 541 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 542 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 543 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 544 if (dir != IEEE80211_FC1_DIR_NODS) 545 bssid = wh->i_addr1; 546 else if (type == IEEE80211_FC0_TYPE_CTL) 547 bssid = wh->i_addr1; 548 else { 549 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 550 IEEE80211_DISCARD_MAC(vap, 551 IEEE80211_MSG_ANY, ni->ni_macaddr, 552 NULL, "too short (2): len %u", 553 m->m_pkthdr.len); 554 vap->iv_stats.is_rx_tooshort++; 555 goto out; 556 } 557 bssid = wh->i_addr3; 558 } 559 /* 560 * Validate the bssid. 561 */ 562 if (!(type == IEEE80211_FC0_TYPE_MGT && 563 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 564 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 565 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 566 /* not interested in */ 567 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 568 bssid, NULL, "%s", "not to bss"); 569 vap->iv_stats.is_rx_wrongbss++; 570 goto out; 571 } 572 573 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 574 ni->ni_noise = nf; 575 if (IEEE80211_HAS_SEQ(type, subtype)) { 576 uint8_t tid = ieee80211_gettid(wh); 577 if (IEEE80211_QOS_HAS_SEQ(wh) && 578 TID_TO_WME_AC(tid) >= WME_AC_VI) 579 ic->ic_wme.wme_hipri_traffic++; 580 rxseq = le16toh(*(uint16_t *)wh->i_seq); 581 if (! ieee80211_check_rxseq(ni, wh)) { 582 /* duplicate, discard */ 583 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 584 bssid, "duplicate", 585 "seqno <%u,%u> fragno <%u,%u> tid %u", 586 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 587 ni->ni_rxseqs[tid] >> 588 IEEE80211_SEQ_SEQ_SHIFT, 589 rxseq & IEEE80211_SEQ_FRAG_MASK, 590 ni->ni_rxseqs[tid] & 591 IEEE80211_SEQ_FRAG_MASK, 592 tid); 593 vap->iv_stats.is_rx_dup++; 594 IEEE80211_NODE_STAT(ni, rx_dup); 595 goto out; 596 } 597 ni->ni_rxseqs[tid] = rxseq; 598 } 599 } 600 601 switch (type) { 602 case IEEE80211_FC0_TYPE_DATA: 603 hdrspace = ieee80211_hdrspace(ic, wh); 604 if (m->m_len < hdrspace && 605 (m = m_pullup(m, hdrspace)) == NULL) { 606 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 607 ni->ni_macaddr, NULL, 608 "data too short: expecting %u", hdrspace); 609 vap->iv_stats.is_rx_tooshort++; 610 goto out; /* XXX */ 611 } 612 if (!(dir == IEEE80211_FC1_DIR_TODS || 613 (dir == IEEE80211_FC1_DIR_DSTODS && 614 (vap->iv_flags & IEEE80211_F_DWDS)))) { 615 if (dir != IEEE80211_FC1_DIR_DSTODS) { 616 IEEE80211_DISCARD(vap, 617 IEEE80211_MSG_INPUT, wh, "data", 618 "incorrect dir 0x%x", dir); 619 } else { 620 IEEE80211_DISCARD(vap, 621 IEEE80211_MSG_INPUT | 622 IEEE80211_MSG_WDS, wh, 623 "4-address data", 624 "%s", "DWDS not enabled"); 625 } 626 vap->iv_stats.is_rx_wrongdir++; 627 goto out; 628 } 629 /* check if source STA is associated */ 630 if (ni == vap->iv_bss) { 631 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 632 wh, "data", "%s", "unknown src"); 633 ieee80211_send_error(ni, wh->i_addr2, 634 IEEE80211_FC0_SUBTYPE_DEAUTH, 635 IEEE80211_REASON_NOT_AUTHED); 636 vap->iv_stats.is_rx_notassoc++; 637 goto err; 638 } 639 if (ni->ni_associd == 0) { 640 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 641 wh, "data", "%s", "unassoc src"); 642 IEEE80211_SEND_MGMT(ni, 643 IEEE80211_FC0_SUBTYPE_DISASSOC, 644 IEEE80211_REASON_NOT_ASSOCED); 645 vap->iv_stats.is_rx_notassoc++; 646 goto err; 647 } 648 649 /* 650 * Check for power save state change. 651 * XXX out-of-order A-MPDU frames? 652 */ 653 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 654 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 655 vap->iv_node_ps(ni, 656 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 657 /* 658 * For 4-address packets handle WDS discovery 659 * notifications. Once a WDS link is setup frames 660 * are just delivered to the WDS vap (see below). 661 */ 662 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 663 if (!ieee80211_node_is_authorized(ni)) { 664 IEEE80211_DISCARD(vap, 665 IEEE80211_MSG_INPUT | 666 IEEE80211_MSG_WDS, wh, 667 "4-address data", 668 "%s", "unauthorized port"); 669 vap->iv_stats.is_rx_unauth++; 670 IEEE80211_NODE_STAT(ni, rx_unauth); 671 goto err; 672 } 673 ieee80211_dwds_discover(ni, m); 674 return type; 675 } 676 677 /* 678 * Handle A-MPDU re-ordering. If the frame is to be 679 * processed directly then ieee80211_ampdu_reorder 680 * will return 0; otherwise it has consumed the mbuf 681 * and we should do nothing more with it. 682 */ 683 if ((m->m_flags & M_AMPDU) && 684 ieee80211_ampdu_reorder(ni, m) != 0) { 685 m = NULL; 686 goto out; 687 } 688 resubmit_ampdu: 689 690 /* 691 * Handle privacy requirements. Note that we 692 * must not be preempted from here until after 693 * we (potentially) call ieee80211_crypto_demic; 694 * otherwise we may violate assumptions in the 695 * crypto cipher modules used to do delayed update 696 * of replay sequence numbers. 697 */ 698 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 699 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 700 /* 701 * Discard encrypted frames when privacy is off. 702 */ 703 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 704 wh, "WEP", "%s", "PRIVACY off"); 705 vap->iv_stats.is_rx_noprivacy++; 706 IEEE80211_NODE_STAT(ni, rx_noprivacy); 707 goto out; 708 } 709 key = ieee80211_crypto_decap(ni, m, hdrspace); 710 if (key == NULL) { 711 /* NB: stats+msgs handled in crypto_decap */ 712 IEEE80211_NODE_STAT(ni, rx_wepfail); 713 goto out; 714 } 715 wh = mtod(m, struct ieee80211_frame *); 716 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 717 } else { 718 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 719 key = NULL; 720 } 721 722 /* 723 * Save QoS bits for use below--before we strip the header. 724 */ 725 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 726 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 727 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 728 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 729 } else 730 qos = 0; 731 732 /* 733 * Next up, any fragmentation. 734 */ 735 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 736 m = ieee80211_defrag(ni, m, hdrspace); 737 if (m == NULL) { 738 /* Fragment dropped or frame not complete yet */ 739 goto out; 740 } 741 } 742 wh = NULL; /* no longer valid, catch any uses */ 743 744 /* 745 * Next strip any MSDU crypto bits. 746 */ 747 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 748 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 749 ni->ni_macaddr, "data", "%s", "demic error"); 750 vap->iv_stats.is_rx_demicfail++; 751 IEEE80211_NODE_STAT(ni, rx_demicfail); 752 goto out; 753 } 754 /* copy to listener after decrypt */ 755 if (ieee80211_radiotap_active_vap(vap)) 756 ieee80211_radiotap_rx(vap, m); 757 need_tap = 0; 758 /* 759 * Finally, strip the 802.11 header. 760 */ 761 m = ieee80211_decap(vap, m, hdrspace); 762 if (m == NULL) { 763 /* XXX mask bit to check for both */ 764 /* don't count Null data frames as errors */ 765 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 766 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 767 goto out; 768 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 769 ni->ni_macaddr, "data", "%s", "decap error"); 770 vap->iv_stats.is_rx_decap++; 771 IEEE80211_NODE_STAT(ni, rx_decap); 772 goto err; 773 } 774 eh = mtod(m, struct ether_header *); 775 if (!ieee80211_node_is_authorized(ni)) { 776 /* 777 * Deny any non-PAE frames received prior to 778 * authorization. For open/shared-key 779 * authentication the port is mark authorized 780 * after authentication completes. For 802.1x 781 * the port is not marked authorized by the 782 * authenticator until the handshake has completed. 783 */ 784 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 785 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 786 eh->ether_shost, "data", 787 "unauthorized port: ether type 0x%x len %u", 788 eh->ether_type, m->m_pkthdr.len); 789 vap->iv_stats.is_rx_unauth++; 790 IEEE80211_NODE_STAT(ni, rx_unauth); 791 goto err; 792 } 793 } else { 794 /* 795 * When denying unencrypted frames, discard 796 * any non-PAE frames received without encryption. 797 */ 798 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 799 (key == NULL && (m->m_flags & M_WEP) == 0) && 800 eh->ether_type != htons(ETHERTYPE_PAE)) { 801 /* 802 * Drop unencrypted frames. 803 */ 804 vap->iv_stats.is_rx_unencrypted++; 805 IEEE80211_NODE_STAT(ni, rx_unencrypted); 806 goto out; 807 } 808 } 809 /* XXX require HT? */ 810 if (qos & IEEE80211_QOS_AMSDU) { 811 m = ieee80211_decap_amsdu(ni, m); 812 if (m == NULL) 813 return IEEE80211_FC0_TYPE_DATA; 814 } else { 815#ifdef IEEE80211_SUPPORT_SUPERG 816 m = ieee80211_decap_fastframe(vap, ni, m); 817 if (m == NULL) 818 return IEEE80211_FC0_TYPE_DATA; 819#endif 820 } 821 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 822 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 823 else 824 hostap_deliver_data(vap, ni, m); 825 return IEEE80211_FC0_TYPE_DATA; 826 827 case IEEE80211_FC0_TYPE_MGT: 828 vap->iv_stats.is_rx_mgmt++; 829 IEEE80211_NODE_STAT(ni, rx_mgmt); 830 if (dir != IEEE80211_FC1_DIR_NODS) { 831 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 832 wh, "mgt", "incorrect dir 0x%x", dir); 833 vap->iv_stats.is_rx_wrongdir++; 834 goto err; 835 } 836 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 837 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 838 ni->ni_macaddr, "mgt", "too short: len %u", 839 m->m_pkthdr.len); 840 vap->iv_stats.is_rx_tooshort++; 841 goto out; 842 } 843 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 844 /* ensure return frames are unicast */ 845 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 846 wh, NULL, "source is multicast: %s", 847 ether_sprintf(wh->i_addr2)); 848 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 849 goto out; 850 } 851#ifdef IEEE80211_DEBUG 852 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 853 ieee80211_msg_dumppkts(vap)) { 854 if_printf(ifp, "received %s from %s rssi %d\n", 855 ieee80211_mgt_subtype_name[subtype >> 856 IEEE80211_FC0_SUBTYPE_SHIFT], 857 ether_sprintf(wh->i_addr2), rssi); 858 } 859#endif 860 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 861 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 862 /* 863 * Only shared key auth frames with a challenge 864 * should be encrypted, discard all others. 865 */ 866 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 867 wh, NULL, 868 "%s", "WEP set but not permitted"); 869 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 870 goto out; 871 } 872 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 873 /* 874 * Discard encrypted frames when privacy is off. 875 */ 876 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 877 wh, NULL, "%s", "WEP set but PRIVACY off"); 878 vap->iv_stats.is_rx_noprivacy++; 879 goto out; 880 } 881 hdrspace = ieee80211_hdrspace(ic, wh); 882 key = ieee80211_crypto_decap(ni, m, hdrspace); 883 if (key == NULL) { 884 /* NB: stats+msgs handled in crypto_decap */ 885 goto out; 886 } 887 wh = mtod(m, struct ieee80211_frame *); 888 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 889 } 890 /* 891 * Pass the packet to radiotap before calling iv_recv_mgmt(). 892 * Otherwise iv_recv_mgmt() might pass another packet to 893 * radiotap, resulting in out of order packet captures. 894 */ 895 if (ieee80211_radiotap_active_vap(vap)) 896 ieee80211_radiotap_rx(vap, m); 897 need_tap = 0; 898 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 899 goto out; 900 901 case IEEE80211_FC0_TYPE_CTL: 902 vap->iv_stats.is_rx_ctl++; 903 IEEE80211_NODE_STAT(ni, rx_ctrl); 904 vap->iv_recv_ctl(ni, m, subtype); 905 goto out; 906 default: 907 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 908 wh, "bad", "frame type 0x%x", type); 909 /* should not come here */ 910 break; 911 } 912err: 913 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 914out: 915 if (m != NULL) { 916 if (need_tap && ieee80211_radiotap_active_vap(vap)) 917 ieee80211_radiotap_rx(vap, m); 918 m_freem(m); 919 } 920 return type; 921} 922 923static void 924hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 925 int rssi, int nf, uint16_t seq, uint16_t status) 926{ 927 struct ieee80211vap *vap = ni->ni_vap; 928 929 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 930 931 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 932 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 933 ni->ni_macaddr, "open auth", 934 "bad sta auth mode %u", ni->ni_authmode); 935 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 936 /* 937 * Clear any challenge text that may be there if 938 * a previous shared key auth failed and then an 939 * open auth is attempted. 940 */ 941 if (ni->ni_challenge != NULL) { 942 free(ni->ni_challenge, M_80211_NODE); 943 ni->ni_challenge = NULL; 944 } 945 /* XXX hack to workaround calling convention */ 946 ieee80211_send_error(ni, wh->i_addr2, 947 IEEE80211_FC0_SUBTYPE_AUTH, 948 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 949 return; 950 } 951 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 952 vap->iv_stats.is_rx_bad_auth++; 953 return; 954 } 955 /* always accept open authentication requests */ 956 if (ni == vap->iv_bss) { 957 ni = ieee80211_dup_bss(vap, wh->i_addr2); 958 if (ni == NULL) 959 return; 960 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 961 (void) ieee80211_ref_node(ni); 962 /* 963 * Mark the node as referenced to reflect that it's 964 * reference count has been bumped to insure it remains 965 * after the transaction completes. 966 */ 967 ni->ni_flags |= IEEE80211_NODE_AREF; 968 /* 969 * Mark the node as requiring a valid association id 970 * before outbound traffic is permitted. 971 */ 972 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 973 974 if (vap->iv_acl != NULL && 975 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 976 /* 977 * When the ACL policy is set to RADIUS we defer the 978 * authorization to a user agent. Dispatch an event, 979 * a subsequent MLME call will decide the fate of the 980 * station. If the user agent is not present then the 981 * node will be reclaimed due to inactivity. 982 */ 983 IEEE80211_NOTE_MAC(vap, 984 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 985 "%s", "station authentication defered (radius acl)"); 986 ieee80211_notify_node_auth(ni); 987 } else { 988 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 989 IEEE80211_NOTE_MAC(vap, 990 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 991 "%s", "station authenticated (open)"); 992 /* 993 * When 802.1x is not in use mark the port 994 * authorized at this point so traffic can flow. 995 */ 996 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 997 ieee80211_node_authorize(ni); 998 } 999} 1000 1001static void 1002hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1003 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1004 uint16_t seq, uint16_t status) 1005{ 1006 struct ieee80211vap *vap = ni->ni_vap; 1007 uint8_t *challenge; 1008 int allocbs, estatus; 1009 1010 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1011 1012 /* 1013 * NB: this can happen as we allow pre-shared key 1014 * authentication to be enabled w/o wep being turned 1015 * on so that configuration of these can be done 1016 * in any order. It may be better to enforce the 1017 * ordering in which case this check would just be 1018 * for sanity/consistency. 1019 */ 1020 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1021 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1022 ni->ni_macaddr, "shared key auth", 1023 "%s", " PRIVACY is disabled"); 1024 estatus = IEEE80211_STATUS_ALG; 1025 goto bad; 1026 } 1027 /* 1028 * Pre-shared key authentication is evil; accept 1029 * it only if explicitly configured (it is supported 1030 * mainly for compatibility with clients like Mac OS X). 1031 */ 1032 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1033 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1034 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1035 ni->ni_macaddr, "shared key auth", 1036 "bad sta auth mode %u", ni->ni_authmode); 1037 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1038 estatus = IEEE80211_STATUS_ALG; 1039 goto bad; 1040 } 1041 1042 challenge = NULL; 1043 if (frm + 1 < efrm) { 1044 if ((frm[1] + 2) > (efrm - frm)) { 1045 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1046 ni->ni_macaddr, "shared key auth", 1047 "ie %d/%d too long", 1048 frm[0], (frm[1] + 2) - (efrm - frm)); 1049 vap->iv_stats.is_rx_bad_auth++; 1050 estatus = IEEE80211_STATUS_CHALLENGE; 1051 goto bad; 1052 } 1053 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1054 challenge = frm; 1055 frm += frm[1] + 2; 1056 } 1057 switch (seq) { 1058 case IEEE80211_AUTH_SHARED_CHALLENGE: 1059 case IEEE80211_AUTH_SHARED_RESPONSE: 1060 if (challenge == NULL) { 1061 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1062 ni->ni_macaddr, "shared key auth", 1063 "%s", "no challenge"); 1064 vap->iv_stats.is_rx_bad_auth++; 1065 estatus = IEEE80211_STATUS_CHALLENGE; 1066 goto bad; 1067 } 1068 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1069 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1070 ni->ni_macaddr, "shared key auth", 1071 "bad challenge len %d", challenge[1]); 1072 vap->iv_stats.is_rx_bad_auth++; 1073 estatus = IEEE80211_STATUS_CHALLENGE; 1074 goto bad; 1075 } 1076 default: 1077 break; 1078 } 1079 switch (seq) { 1080 case IEEE80211_AUTH_SHARED_REQUEST: 1081 if (ni == vap->iv_bss) { 1082 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1083 if (ni == NULL) { 1084 /* NB: no way to return an error */ 1085 return; 1086 } 1087 allocbs = 1; 1088 } else { 1089 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1090 (void) ieee80211_ref_node(ni); 1091 allocbs = 0; 1092 } 1093 /* 1094 * Mark the node as referenced to reflect that it's 1095 * reference count has been bumped to insure it remains 1096 * after the transaction completes. 1097 */ 1098 ni->ni_flags |= IEEE80211_NODE_AREF; 1099 /* 1100 * Mark the node as requiring a valid associatio id 1101 * before outbound traffic is permitted. 1102 */ 1103 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1104 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1105 ni->ni_noise = nf; 1106 if (!ieee80211_alloc_challenge(ni)) { 1107 /* NB: don't return error so they rexmit */ 1108 return; 1109 } 1110 get_random_bytes(ni->ni_challenge, 1111 IEEE80211_CHALLENGE_LEN); 1112 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1113 ni, "shared key %sauth request", allocbs ? "" : "re"); 1114 /* 1115 * When the ACL policy is set to RADIUS we defer the 1116 * authorization to a user agent. Dispatch an event, 1117 * a subsequent MLME call will decide the fate of the 1118 * station. If the user agent is not present then the 1119 * node will be reclaimed due to inactivity. 1120 */ 1121 if (vap->iv_acl != NULL && 1122 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1123 IEEE80211_NOTE_MAC(vap, 1124 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1125 ni->ni_macaddr, 1126 "%s", "station authentication defered (radius acl)"); 1127 ieee80211_notify_node_auth(ni); 1128 return; 1129 } 1130 break; 1131 case IEEE80211_AUTH_SHARED_RESPONSE: 1132 if (ni == vap->iv_bss) { 1133 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1134 ni->ni_macaddr, "shared key response", 1135 "%s", "unknown station"); 1136 /* NB: don't send a response */ 1137 return; 1138 } 1139 if (ni->ni_challenge == NULL) { 1140 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1141 ni->ni_macaddr, "shared key response", 1142 "%s", "no challenge recorded"); 1143 vap->iv_stats.is_rx_bad_auth++; 1144 estatus = IEEE80211_STATUS_CHALLENGE; 1145 goto bad; 1146 } 1147 if (memcmp(ni->ni_challenge, &challenge[2], 1148 challenge[1]) != 0) { 1149 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1150 ni->ni_macaddr, "shared key response", 1151 "%s", "challenge mismatch"); 1152 vap->iv_stats.is_rx_auth_fail++; 1153 estatus = IEEE80211_STATUS_CHALLENGE; 1154 goto bad; 1155 } 1156 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1157 ni, "%s", "station authenticated (shared key)"); 1158 ieee80211_node_authorize(ni); 1159 break; 1160 default: 1161 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1162 ni->ni_macaddr, "shared key auth", 1163 "bad seq %d", seq); 1164 vap->iv_stats.is_rx_bad_auth++; 1165 estatus = IEEE80211_STATUS_SEQUENCE; 1166 goto bad; 1167 } 1168 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1169 return; 1170bad: 1171 /* 1172 * Send an error response; but only when operating as an AP. 1173 */ 1174 /* XXX hack to workaround calling convention */ 1175 ieee80211_send_error(ni, wh->i_addr2, 1176 IEEE80211_FC0_SUBTYPE_AUTH, 1177 (seq + 1) | (estatus<<16)); 1178} 1179 1180/* 1181 * Convert a WPA cipher selector OUI to an internal 1182 * cipher algorithm. Where appropriate we also 1183 * record any key length. 1184 */ 1185static int 1186wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1187{ 1188#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1189 uint32_t w = LE_READ_4(sel); 1190 1191 switch (w) { 1192 case WPA_SEL(WPA_CSE_NULL): 1193 return IEEE80211_CIPHER_NONE; 1194 case WPA_SEL(WPA_CSE_WEP40): 1195 if (keylen) 1196 *keylen = 40 / NBBY; 1197 return IEEE80211_CIPHER_WEP; 1198 case WPA_SEL(WPA_CSE_WEP104): 1199 if (keylen) 1200 *keylen = 104 / NBBY; 1201 return IEEE80211_CIPHER_WEP; 1202 case WPA_SEL(WPA_CSE_TKIP): 1203 return IEEE80211_CIPHER_TKIP; 1204 case WPA_SEL(WPA_CSE_CCMP): 1205 return IEEE80211_CIPHER_AES_CCM; 1206 } 1207 return 32; /* NB: so 1<< is discarded */ 1208#undef WPA_SEL 1209} 1210 1211/* 1212 * Convert a WPA key management/authentication algorithm 1213 * to an internal code. 1214 */ 1215static int 1216wpa_keymgmt(const uint8_t *sel) 1217{ 1218#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1219 uint32_t w = LE_READ_4(sel); 1220 1221 switch (w) { 1222 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1223 return WPA_ASE_8021X_UNSPEC; 1224 case WPA_SEL(WPA_ASE_8021X_PSK): 1225 return WPA_ASE_8021X_PSK; 1226 case WPA_SEL(WPA_ASE_NONE): 1227 return WPA_ASE_NONE; 1228 } 1229 return 0; /* NB: so is discarded */ 1230#undef WPA_SEL 1231} 1232 1233/* 1234 * Parse a WPA information element to collect parameters. 1235 * Note that we do not validate security parameters; that 1236 * is handled by the authenticator; the parsing done here 1237 * is just for internal use in making operational decisions. 1238 */ 1239static int 1240ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1241 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1242{ 1243 uint8_t len = frm[1]; 1244 uint32_t w; 1245 int n; 1246 1247 /* 1248 * Check the length once for fixed parts: OUI, type, 1249 * version, mcast cipher, and 2 selector counts. 1250 * Other, variable-length data, must be checked separately. 1251 */ 1252 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1253 IEEE80211_DISCARD_IE(vap, 1254 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1255 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1256 return IEEE80211_REASON_IE_INVALID; 1257 } 1258 if (len < 14) { 1259 IEEE80211_DISCARD_IE(vap, 1260 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1261 wh, "WPA", "too short, len %u", len); 1262 return IEEE80211_REASON_IE_INVALID; 1263 } 1264 frm += 6, len -= 4; /* NB: len is payload only */ 1265 /* NB: iswpaoui already validated the OUI and type */ 1266 w = LE_READ_2(frm); 1267 if (w != WPA_VERSION) { 1268 IEEE80211_DISCARD_IE(vap, 1269 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1270 wh, "WPA", "bad version %u", w); 1271 return IEEE80211_REASON_IE_INVALID; 1272 } 1273 frm += 2, len -= 2; 1274 1275 memset(rsn, 0, sizeof(*rsn)); 1276 1277 /* multicast/group cipher */ 1278 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1279 frm += 4, len -= 4; 1280 1281 /* unicast ciphers */ 1282 n = LE_READ_2(frm); 1283 frm += 2, len -= 2; 1284 if (len < n*4+2) { 1285 IEEE80211_DISCARD_IE(vap, 1286 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1287 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1288 len, n); 1289 return IEEE80211_REASON_IE_INVALID; 1290 } 1291 w = 0; 1292 for (; n > 0; n--) { 1293 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1294 frm += 4, len -= 4; 1295 } 1296 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1297 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1298 else 1299 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1300 1301 /* key management algorithms */ 1302 n = LE_READ_2(frm); 1303 frm += 2, len -= 2; 1304 if (len < n*4) { 1305 IEEE80211_DISCARD_IE(vap, 1306 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1307 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1308 len, n); 1309 return IEEE80211_REASON_IE_INVALID; 1310 } 1311 w = 0; 1312 for (; n > 0; n--) { 1313 w |= wpa_keymgmt(frm); 1314 frm += 4, len -= 4; 1315 } 1316 if (w & WPA_ASE_8021X_UNSPEC) 1317 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1318 else 1319 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1320 1321 if (len > 2) /* optional capabilities */ 1322 rsn->rsn_caps = LE_READ_2(frm); 1323 1324 return 0; 1325} 1326 1327/* 1328 * Convert an RSN cipher selector OUI to an internal 1329 * cipher algorithm. Where appropriate we also 1330 * record any key length. 1331 */ 1332static int 1333rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1334{ 1335#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1336 uint32_t w = LE_READ_4(sel); 1337 1338 switch (w) { 1339 case RSN_SEL(RSN_CSE_NULL): 1340 return IEEE80211_CIPHER_NONE; 1341 case RSN_SEL(RSN_CSE_WEP40): 1342 if (keylen) 1343 *keylen = 40 / NBBY; 1344 return IEEE80211_CIPHER_WEP; 1345 case RSN_SEL(RSN_CSE_WEP104): 1346 if (keylen) 1347 *keylen = 104 / NBBY; 1348 return IEEE80211_CIPHER_WEP; 1349 case RSN_SEL(RSN_CSE_TKIP): 1350 return IEEE80211_CIPHER_TKIP; 1351 case RSN_SEL(RSN_CSE_CCMP): 1352 return IEEE80211_CIPHER_AES_CCM; 1353 case RSN_SEL(RSN_CSE_WRAP): 1354 return IEEE80211_CIPHER_AES_OCB; 1355 } 1356 return 32; /* NB: so 1<< is discarded */ 1357#undef WPA_SEL 1358} 1359 1360/* 1361 * Convert an RSN key management/authentication algorithm 1362 * to an internal code. 1363 */ 1364static int 1365rsn_keymgmt(const uint8_t *sel) 1366{ 1367#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1368 uint32_t w = LE_READ_4(sel); 1369 1370 switch (w) { 1371 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1372 return RSN_ASE_8021X_UNSPEC; 1373 case RSN_SEL(RSN_ASE_8021X_PSK): 1374 return RSN_ASE_8021X_PSK; 1375 case RSN_SEL(RSN_ASE_NONE): 1376 return RSN_ASE_NONE; 1377 } 1378 return 0; /* NB: so is discarded */ 1379#undef RSN_SEL 1380} 1381 1382/* 1383 * Parse a WPA/RSN information element to collect parameters 1384 * and validate the parameters against what has been 1385 * configured for the system. 1386 */ 1387static int 1388ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1389 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1390{ 1391 uint8_t len = frm[1]; 1392 uint32_t w; 1393 int n; 1394 1395 /* 1396 * Check the length once for fixed parts: 1397 * version, mcast cipher, and 2 selector counts. 1398 * Other, variable-length data, must be checked separately. 1399 */ 1400 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1401 IEEE80211_DISCARD_IE(vap, 1402 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1403 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1404 return IEEE80211_REASON_IE_INVALID; 1405 } 1406 if (len < 10) { 1407 IEEE80211_DISCARD_IE(vap, 1408 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1409 wh, "RSN", "too short, len %u", len); 1410 return IEEE80211_REASON_IE_INVALID; 1411 } 1412 frm += 2; 1413 w = LE_READ_2(frm); 1414 if (w != RSN_VERSION) { 1415 IEEE80211_DISCARD_IE(vap, 1416 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1417 wh, "RSN", "bad version %u", w); 1418 return IEEE80211_REASON_IE_INVALID; 1419 } 1420 frm += 2, len -= 2; 1421 1422 memset(rsn, 0, sizeof(*rsn)); 1423 1424 /* multicast/group cipher */ 1425 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1426 frm += 4, len -= 4; 1427 1428 /* unicast ciphers */ 1429 n = LE_READ_2(frm); 1430 frm += 2, len -= 2; 1431 if (len < n*4+2) { 1432 IEEE80211_DISCARD_IE(vap, 1433 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1434 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1435 len, n); 1436 return IEEE80211_REASON_IE_INVALID; 1437 } 1438 w = 0; 1439 for (; n > 0; n--) { 1440 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1441 frm += 4, len -= 4; 1442 } 1443 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1444 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1445 else 1446 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1447 1448 /* key management algorithms */ 1449 n = LE_READ_2(frm); 1450 frm += 2, len -= 2; 1451 if (len < n*4) { 1452 IEEE80211_DISCARD_IE(vap, 1453 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1454 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1455 len, n); 1456 return IEEE80211_REASON_IE_INVALID; 1457 } 1458 w = 0; 1459 for (; n > 0; n--) { 1460 w |= rsn_keymgmt(frm); 1461 frm += 4, len -= 4; 1462 } 1463 if (w & RSN_ASE_8021X_UNSPEC) 1464 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1465 else 1466 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1467 1468 /* optional RSN capabilities */ 1469 if (len > 2) 1470 rsn->rsn_caps = LE_READ_2(frm); 1471 /* XXXPMKID */ 1472 1473 return 0; 1474} 1475 1476/* 1477 * WPA/802.11i assocation request processing. 1478 */ 1479static int 1480wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1481 const struct ieee80211_frame *wh, const uint8_t *wpa, 1482 const uint8_t *rsn, uint16_t capinfo) 1483{ 1484 struct ieee80211vap *vap = ni->ni_vap; 1485 uint8_t reason; 1486 int badwparsn; 1487 1488 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1489 if (wpa == NULL && rsn == NULL) { 1490 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1491 /* 1492 * W-Fi Protected Setup (WPS) permits 1493 * clients to associate and pass EAPOL frames 1494 * to establish initial credentials. 1495 */ 1496 ni->ni_flags |= IEEE80211_NODE_WPS; 1497 return 1; 1498 } 1499 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1500 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1501 /* 1502 * Transitional Security Network. Permits clients 1503 * to associate and use WEP while WPA is configured. 1504 */ 1505 ni->ni_flags |= IEEE80211_NODE_TSN; 1506 return 1; 1507 } 1508 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1509 wh, NULL, "%s", "no 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 /* assert right association security credentials */ 1515 badwparsn = 0; /* NB: to silence compiler */ 1516 switch (vap->iv_flags & IEEE80211_F_WPA) { 1517 case IEEE80211_F_WPA1: 1518 badwparsn = (wpa == NULL); 1519 break; 1520 case IEEE80211_F_WPA2: 1521 badwparsn = (rsn == NULL); 1522 break; 1523 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1524 badwparsn = (wpa == NULL && rsn == NULL); 1525 break; 1526 } 1527 if (badwparsn) { 1528 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1529 wh, NULL, 1530 "%s", "missing WPA/RSN IE in association request"); 1531 vap->iv_stats.is_rx_assoc_badwpaie++; 1532 reason = IEEE80211_REASON_IE_INVALID; 1533 goto bad; 1534 } 1535 /* 1536 * Parse WPA/RSN information element. 1537 */ 1538 if (wpa != NULL) 1539 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1540 else 1541 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1542 if (reason != 0) { 1543 /* XXX distinguish WPA/RSN? */ 1544 vap->iv_stats.is_rx_assoc_badwpaie++; 1545 goto bad; 1546 } 1547 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1548 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1549 wpa != NULL ? "WPA" : "RSN", 1550 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1551 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1552 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1553 1554 return 1; 1555bad: 1556 ieee80211_node_deauth(ni, reason); 1557 return 0; 1558} 1559 1560/* XXX find a better place for definition */ 1561struct l2_update_frame { 1562 struct ether_header eh; 1563 uint8_t dsap; 1564 uint8_t ssap; 1565 uint8_t control; 1566 uint8_t xid[3]; 1567} __packed; 1568 1569/* 1570 * Deliver a TGf L2UF frame on behalf of a station. 1571 * This primes any bridge when the station is roaming 1572 * between ap's on the same wired network. 1573 */ 1574static void 1575ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1576{ 1577 struct ieee80211vap *vap = ni->ni_vap; 1578 struct ifnet *ifp = vap->iv_ifp; 1579 struct mbuf *m; 1580 struct l2_update_frame *l2uf; 1581 struct ether_header *eh; 1582 1583 m = m_gethdr(M_NOWAIT, MT_DATA); 1584 if (m == NULL) { 1585 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1586 "%s", "no mbuf for l2uf frame"); 1587 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1588 return; 1589 } 1590 l2uf = mtod(m, struct l2_update_frame *); 1591 eh = &l2uf->eh; 1592 /* dst: Broadcast address */ 1593 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1594 /* src: associated STA */ 1595 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1596 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1597 1598 l2uf->dsap = 0; 1599 l2uf->ssap = 0; 1600 l2uf->control = 0xf5; 1601 l2uf->xid[0] = 0x81; 1602 l2uf->xid[1] = 0x80; 1603 l2uf->xid[2] = 0x00; 1604 1605 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1606 hostap_deliver_data(vap, ni, m); 1607} 1608 1609static void 1610ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1611 int reassoc, int resp, const char *tag, int rate) 1612{ 1613 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1614 "deny %s request, %s rate set mismatch, rate/MCS %d", 1615 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1616 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1617 ieee80211_node_leave(ni); 1618} 1619 1620static void 1621capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1622 int reassoc, int resp, const char *tag, int capinfo) 1623{ 1624 struct ieee80211vap *vap = ni->ni_vap; 1625 1626 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1627 "deny %s request, %s mismatch 0x%x", 1628 reassoc ? "reassoc" : "assoc", tag, capinfo); 1629 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1630 ieee80211_node_leave(ni); 1631 vap->iv_stats.is_rx_assoc_capmismatch++; 1632} 1633 1634static void 1635htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1636 int reassoc, int resp) 1637{ 1638 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1639 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1640 /* XXX no better code */ 1641 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1642 ieee80211_node_leave(ni); 1643} 1644 1645static void 1646authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1647 int algo, int seq, int status) 1648{ 1649 struct ieee80211vap *vap = ni->ni_vap; 1650 1651 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1652 wh, NULL, "unsupported alg %d", algo); 1653 vap->iv_stats.is_rx_auth_unsupported++; 1654 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1655 seq | (status << 16)); 1656} 1657 1658static __inline int 1659ishtmixed(const uint8_t *ie) 1660{ 1661 const struct ieee80211_ie_htinfo *ht = 1662 (const struct ieee80211_ie_htinfo *) ie; 1663 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1664 IEEE80211_HTINFO_OPMODE_MIXED; 1665} 1666 1667static int 1668is11bclient(const uint8_t *rates, const uint8_t *xrates) 1669{ 1670 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1671 int i; 1672 1673 /* NB: the 11b clients we care about will not have xrates */ 1674 if (xrates != NULL || rates == NULL) 1675 return 0; 1676 for (i = 0; i < rates[1]; i++) { 1677 int r = rates[2+i] & IEEE80211_RATE_VAL; 1678 if (r > 2*11 || ((1<<r) & brates) == 0) 1679 return 0; 1680 } 1681 return 1; 1682} 1683 1684static void 1685hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1686 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1687{ 1688 struct ieee80211vap *vap = ni->ni_vap; 1689 struct ieee80211com *ic = ni->ni_ic; 1690 struct ieee80211_frame *wh; 1691 uint8_t *frm, *efrm, *sfrm; 1692 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1693 int reassoc, resp; 1694 uint8_t rate; 1695 1696 wh = mtod(m0, struct ieee80211_frame *); 1697 frm = (uint8_t *)&wh[1]; 1698 efrm = mtod(m0, uint8_t *) + m0->m_len; 1699 switch (subtype) { 1700 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1701 case IEEE80211_FC0_SUBTYPE_BEACON: { 1702 struct ieee80211_scanparams scan; 1703 /* 1704 * We process beacon/probe response frames when scanning; 1705 * otherwise we check beacon frames for overlapping non-ERP 1706 * BSS in 11g and/or overlapping legacy BSS when in HT. 1707 */ 1708 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1709 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1710 vap->iv_stats.is_rx_mgtdiscard++; 1711 return; 1712 } 1713 /* NB: accept off-channel frames */ 1714 /* XXX TODO: use rxstatus to determine off-channel details */ 1715 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1716 return; 1717 /* 1718 * Count frame now that we know it's to be processed. 1719 */ 1720 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1721 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1722 IEEE80211_NODE_STAT(ni, rx_beacons); 1723 } else 1724 IEEE80211_NODE_STAT(ni, rx_proberesp); 1725 /* 1726 * If scanning, just pass information to the scan module. 1727 */ 1728 if (ic->ic_flags & IEEE80211_F_SCAN) { 1729 if (scan.status == 0 && /* NB: on channel */ 1730 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1731 /* 1732 * Actively scanning a channel marked passive; 1733 * send a probe request now that we know there 1734 * is 802.11 traffic present. 1735 * 1736 * XXX check if the beacon we recv'd gives 1737 * us what we need and suppress the probe req 1738 */ 1739 ieee80211_probe_curchan(vap, 1); 1740 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1741 } 1742 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh, 1743 subtype, rssi, nf); 1744 return; 1745 } 1746 /* 1747 * Check beacon for overlapping bss w/ non ERP stations. 1748 * If we detect one and protection is configured but not 1749 * enabled, enable it and start a timer that'll bring us 1750 * out if we stop seeing the bss. 1751 */ 1752 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1753 scan.status == 0 && /* NB: on-channel */ 1754 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1755 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1756 ic->ic_lastnonerp = ticks; 1757 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1758 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1759 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1760 IEEE80211_NOTE_FRAME(vap, 1761 IEEE80211_MSG_ASSOC, wh, 1762 "non-ERP present on channel %d " 1763 "(saw erp 0x%x from channel %d), " 1764 "enable use of protection", 1765 ic->ic_curchan->ic_ieee, 1766 scan.erp, scan.chan); 1767 ic->ic_flags |= IEEE80211_F_USEPROT; 1768 ieee80211_notify_erp(ic); 1769 } 1770 } 1771 /* 1772 * Check beacon for non-HT station on HT channel 1773 * and update HT BSS occupancy as appropriate. 1774 */ 1775 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1776 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1777 /* 1778 * Off control channel; only check frames 1779 * that come in the extension channel when 1780 * operating w/ HT40. 1781 */ 1782 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1783 break; 1784 if (scan.chan != ic->ic_curchan->ic_extieee) 1785 break; 1786 } 1787 if (scan.htinfo == NULL) { 1788 ieee80211_htprot_update(ic, 1789 IEEE80211_HTINFO_OPMODE_PROTOPT | 1790 IEEE80211_HTINFO_NONHT_PRESENT); 1791 } else if (ishtmixed(scan.htinfo)) { 1792 /* XXX? take NONHT_PRESENT from beacon? */ 1793 ieee80211_htprot_update(ic, 1794 IEEE80211_HTINFO_OPMODE_MIXED | 1795 IEEE80211_HTINFO_NONHT_PRESENT); 1796 } 1797 } 1798 break; 1799 } 1800 1801 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1802 if (vap->iv_state != IEEE80211_S_RUN) { 1803 vap->iv_stats.is_rx_mgtdiscard++; 1804 return; 1805 } 1806 /* 1807 * Consult the ACL policy module if setup. 1808 */ 1809 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1810 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1811 wh, NULL, "%s", "disallowed by ACL"); 1812 vap->iv_stats.is_rx_acl++; 1813 return; 1814 } 1815 /* 1816 * prreq frame format 1817 * [tlv] ssid 1818 * [tlv] supported rates 1819 * [tlv] extended supported rates 1820 */ 1821 ssid = rates = xrates = NULL; 1822 sfrm = frm; 1823 while (efrm - frm > 1) { 1824 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1825 switch (*frm) { 1826 case IEEE80211_ELEMID_SSID: 1827 ssid = frm; 1828 break; 1829 case IEEE80211_ELEMID_RATES: 1830 rates = frm; 1831 break; 1832 case IEEE80211_ELEMID_XRATES: 1833 xrates = frm; 1834 break; 1835 } 1836 frm += frm[1] + 2; 1837 } 1838 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1839 if (xrates != NULL) 1840 IEEE80211_VERIFY_ELEMENT(xrates, 1841 IEEE80211_RATE_MAXSIZE - rates[1], return); 1842 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1843 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1844 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1845 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1846 wh, NULL, 1847 "%s", "no ssid with ssid suppression enabled"); 1848 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1849 return; 1850 } 1851 1852 /* XXX find a better class or define it's own */ 1853 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1854 "%s", "recv probe req"); 1855 /* 1856 * Some legacy 11b clients cannot hack a complete 1857 * probe response frame. When the request includes 1858 * only a bare-bones rate set, communicate this to 1859 * the transmit side. 1860 */ 1861 ieee80211_send_proberesp(vap, wh->i_addr2, 1862 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1863 break; 1864 1865 case IEEE80211_FC0_SUBTYPE_AUTH: { 1866 uint16_t algo, seq, status; 1867 1868 if (vap->iv_state != IEEE80211_S_RUN) { 1869 vap->iv_stats.is_rx_mgtdiscard++; 1870 return; 1871 } 1872 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1873 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1874 wh, NULL, "%s", "wrong bssid"); 1875 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1876 return; 1877 } 1878 /* 1879 * auth frame format 1880 * [2] algorithm 1881 * [2] sequence 1882 * [2] status 1883 * [tlv*] challenge 1884 */ 1885 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1886 algo = le16toh(*(uint16_t *)frm); 1887 seq = le16toh(*(uint16_t *)(frm + 2)); 1888 status = le16toh(*(uint16_t *)(frm + 4)); 1889 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1890 "recv auth frame with algorithm %d seq %d", algo, seq); 1891 /* 1892 * Consult the ACL policy module if setup. 1893 */ 1894 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1895 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1896 wh, NULL, "%s", "disallowed by ACL"); 1897 vap->iv_stats.is_rx_acl++; 1898 ieee80211_send_error(ni, wh->i_addr2, 1899 IEEE80211_FC0_SUBTYPE_AUTH, 1900 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1901 return; 1902 } 1903 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1904 IEEE80211_DISCARD(vap, 1905 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1906 wh, NULL, "%s", "TKIP countermeasures enabled"); 1907 vap->iv_stats.is_rx_auth_countermeasures++; 1908 ieee80211_send_error(ni, wh->i_addr2, 1909 IEEE80211_FC0_SUBTYPE_AUTH, 1910 IEEE80211_REASON_MIC_FAILURE); 1911 return; 1912 } 1913 if (algo == IEEE80211_AUTH_ALG_SHARED) 1914 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1915 seq, status); 1916 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1917 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1918 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1919 authalgreject(ni, wh, algo, 1920 seq+1, IEEE80211_STATUS_ALG); 1921 return; 1922 } else { 1923 /* 1924 * We assume that an unknown algorithm is the result 1925 * of a decryption failure on a shared key auth frame; 1926 * return a status code appropriate for that instead 1927 * of IEEE80211_STATUS_ALG. 1928 * 1929 * NB: a seq# of 4 is intentional; the decrypted 1930 * frame likely has a bogus seq value. 1931 */ 1932 authalgreject(ni, wh, algo, 1933 4, IEEE80211_STATUS_CHALLENGE); 1934 return; 1935 } 1936 break; 1937 } 1938 1939 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1940 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1941 uint16_t capinfo, lintval; 1942 struct ieee80211_rsnparms rsnparms; 1943 1944 if (vap->iv_state != IEEE80211_S_RUN) { 1945 vap->iv_stats.is_rx_mgtdiscard++; 1946 return; 1947 } 1948 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1949 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1950 wh, NULL, "%s", "wrong bssid"); 1951 vap->iv_stats.is_rx_assoc_bss++; 1952 return; 1953 } 1954 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1955 reassoc = 1; 1956 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1957 } else { 1958 reassoc = 0; 1959 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1960 } 1961 if (ni == vap->iv_bss) { 1962 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1963 "deny %s request, sta not authenticated", 1964 reassoc ? "reassoc" : "assoc"); 1965 ieee80211_send_error(ni, wh->i_addr2, 1966 IEEE80211_FC0_SUBTYPE_DEAUTH, 1967 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1968 vap->iv_stats.is_rx_assoc_notauth++; 1969 return; 1970 } 1971 1972 /* 1973 * asreq frame format 1974 * [2] capability information 1975 * [2] listen interval 1976 * [6*] current AP address (reassoc only) 1977 * [tlv] ssid 1978 * [tlv] supported rates 1979 * [tlv] extended supported rates 1980 * [tlv] WPA or RSN 1981 * [tlv] HT capabilities 1982 * [tlv] Atheros capabilities 1983 */ 1984 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1985 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1986 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1987 if (reassoc) 1988 frm += 6; /* ignore current AP info */ 1989 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1990 sfrm = frm; 1991 while (efrm - frm > 1) { 1992 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1993 switch (*frm) { 1994 case IEEE80211_ELEMID_SSID: 1995 ssid = frm; 1996 break; 1997 case IEEE80211_ELEMID_RATES: 1998 rates = frm; 1999 break; 2000 case IEEE80211_ELEMID_XRATES: 2001 xrates = frm; 2002 break; 2003 case IEEE80211_ELEMID_RSN: 2004 rsn = frm; 2005 break; 2006 case IEEE80211_ELEMID_HTCAP: 2007 htcap = frm; 2008 break; 2009 case IEEE80211_ELEMID_VENDOR: 2010 if (iswpaoui(frm)) 2011 wpa = frm; 2012 else if (iswmeinfo(frm)) 2013 wme = frm; 2014#ifdef IEEE80211_SUPPORT_SUPERG 2015 else if (isatherosoui(frm)) 2016 ath = frm; 2017#endif 2018 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2019 if (ishtcapoui(frm) && htcap == NULL) 2020 htcap = frm; 2021 } 2022 break; 2023 } 2024 frm += frm[1] + 2; 2025 } 2026 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2027 if (xrates != NULL) 2028 IEEE80211_VERIFY_ELEMENT(xrates, 2029 IEEE80211_RATE_MAXSIZE - rates[1], return); 2030 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2031 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2032 if (htcap != NULL) { 2033 IEEE80211_VERIFY_LENGTH(htcap[1], 2034 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2035 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2036 sizeof(struct ieee80211_ie_htcap)-2, 2037 return); /* XXX just NULL out? */ 2038 } 2039 2040 if ((vap->iv_flags & IEEE80211_F_WPA) && 2041 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2042 return; 2043 /* discard challenge after association */ 2044 if (ni->ni_challenge != NULL) { 2045 free(ni->ni_challenge, M_80211_NODE); 2046 ni->ni_challenge = NULL; 2047 } 2048 /* NB: 802.11 spec says to ignore station's privacy bit */ 2049 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2050 capinfomismatch(ni, wh, reassoc, resp, 2051 "capability", capinfo); 2052 return; 2053 } 2054 /* 2055 * Disallow re-associate w/ invalid slot time setting. 2056 */ 2057 if (ni->ni_associd != 0 && 2058 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2059 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2060 capinfomismatch(ni, wh, reassoc, resp, 2061 "slot time", capinfo); 2062 return; 2063 } 2064 rate = ieee80211_setup_rates(ni, rates, xrates, 2065 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2066 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2067 if (rate & IEEE80211_RATE_BASIC) { 2068 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2069 vap->iv_stats.is_rx_assoc_norate++; 2070 return; 2071 } 2072 /* 2073 * If constrained to 11g-only stations reject an 2074 * 11b-only station. We cheat a bit here by looking 2075 * at the max negotiated xmit rate and assuming anyone 2076 * with a best rate <24Mb/s is an 11b station. 2077 */ 2078 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2079 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2080 vap->iv_stats.is_rx_assoc_norate++; 2081 return; 2082 } 2083 /* 2084 * Do HT rate set handling and setup HT node state. 2085 */ 2086 ni->ni_chan = vap->iv_bss->ni_chan; 2087 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2088 rate = ieee80211_setup_htrates(ni, htcap, 2089 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2090 IEEE80211_F_DOBRS); 2091 if (rate & IEEE80211_RATE_BASIC) { 2092 ratesetmismatch(ni, wh, reassoc, resp, 2093 "HT", rate); 2094 vap->iv_stats.is_ht_assoc_norate++; 2095 return; 2096 } 2097 ieee80211_ht_node_init(ni); 2098 ieee80211_ht_updatehtcap(ni, htcap); 2099 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2100 ieee80211_ht_node_cleanup(ni); 2101#ifdef IEEE80211_SUPPORT_SUPERG 2102 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2103 ieee80211_ff_node_cleanup(ni); 2104#endif 2105 /* 2106 * Allow AMPDU operation only with unencrypted traffic 2107 * or AES-CCM; the 11n spec only specifies these ciphers 2108 * so permitting any others is undefined and can lead 2109 * to interoperability problems. 2110 */ 2111 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2112 (((vap->iv_flags & IEEE80211_F_WPA) && 2113 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2114 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2115 IEEE80211_NOTE(vap, 2116 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2117 "disallow HT use because WEP or TKIP requested, " 2118 "capinfo 0x%x ucastcipher %d", capinfo, 2119 rsnparms.rsn_ucastcipher); 2120 ieee80211_ht_node_cleanup(ni); 2121 vap->iv_stats.is_ht_assoc_downgrade++; 2122 } 2123 /* 2124 * If constrained to 11n-only stations reject legacy stations. 2125 */ 2126 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2127 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2128 htcapmismatch(ni, wh, reassoc, resp); 2129 vap->iv_stats.is_ht_assoc_nohtcap++; 2130 return; 2131 } 2132 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2133 ni->ni_noise = nf; 2134 ni->ni_intval = lintval; 2135 ni->ni_capinfo = capinfo; 2136 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2137 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2138 /* 2139 * Store the IEs. 2140 * XXX maybe better to just expand 2141 */ 2142 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2143#define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2144 if (wpa != NULL) 2145 setie(wpa_ie, wpa - sfrm); 2146 if (rsn != NULL) 2147 setie(rsn_ie, rsn - sfrm); 2148 if (htcap != NULL) 2149 setie(htcap_ie, htcap - sfrm); 2150 if (wme != NULL) { 2151 setie(wme_ie, wme - sfrm); 2152 /* 2153 * Mark node as capable of QoS. 2154 */ 2155 ni->ni_flags |= IEEE80211_NODE_QOS; 2156 } else 2157 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2158#ifdef IEEE80211_SUPPORT_SUPERG 2159 if (ath != NULL) { 2160 setie(ath_ie, ath - sfrm); 2161 /* 2162 * Parse ATH station parameters. 2163 */ 2164 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2165 } else 2166#endif 2167 ni->ni_ath_flags = 0; 2168#undef setie 2169 } else { 2170 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2171 ni->ni_ath_flags = 0; 2172 } 2173 ieee80211_node_join(ni, resp); 2174 ieee80211_deliver_l2uf(ni); 2175 break; 2176 } 2177 2178 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2179 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2180 uint16_t reason; 2181 2182 if (vap->iv_state != IEEE80211_S_RUN || 2183 /* NB: can happen when in promiscuous mode */ 2184 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2185 vap->iv_stats.is_rx_mgtdiscard++; 2186 break; 2187 } 2188 /* 2189 * deauth/disassoc frame format 2190 * [2] reason 2191 */ 2192 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2193 reason = le16toh(*(uint16_t *)frm); 2194 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2195 vap->iv_stats.is_rx_deauth++; 2196 IEEE80211_NODE_STAT(ni, rx_deauth); 2197 } else { 2198 vap->iv_stats.is_rx_disassoc++; 2199 IEEE80211_NODE_STAT(ni, rx_disassoc); 2200 } 2201 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2202 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2203 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2204 if (ni != vap->iv_bss) 2205 ieee80211_node_leave(ni); 2206 break; 2207 } 2208 2209 case IEEE80211_FC0_SUBTYPE_ACTION: 2210 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2211 if (ni == vap->iv_bss) { 2212 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2213 wh, NULL, "%s", "unknown node"); 2214 vap->iv_stats.is_rx_mgtdiscard++; 2215 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2216 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2217 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2218 wh, NULL, "%s", "not for us"); 2219 vap->iv_stats.is_rx_mgtdiscard++; 2220 } else if (vap->iv_state != IEEE80211_S_RUN) { 2221 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2222 wh, NULL, "wrong state %s", 2223 ieee80211_state_name[vap->iv_state]); 2224 vap->iv_stats.is_rx_mgtdiscard++; 2225 } else { 2226 if (ieee80211_parse_action(ni, m0) == 0) 2227 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2228 } 2229 break; 2230 2231 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2232 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2233 case IEEE80211_FC0_SUBTYPE_ATIM: 2234 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2235 wh, NULL, "%s", "not handled"); 2236 vap->iv_stats.is_rx_mgtdiscard++; 2237 break; 2238 2239 default: 2240 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2241 wh, "mgt", "subtype 0x%x not handled", subtype); 2242 vap->iv_stats.is_rx_badsubtype++; 2243 break; 2244 } 2245} 2246 2247static void 2248hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2249{ 2250 switch (subtype) { 2251 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2252 ni->ni_vap->iv_recv_pspoll(ni, m); 2253 break; 2254 case IEEE80211_FC0_SUBTYPE_BAR: 2255 ieee80211_recv_bar(ni, m); 2256 break; 2257 } 2258} 2259 2260/* 2261 * Process a received ps-poll frame. 2262 */ 2263void 2264ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2265{ 2266 struct ieee80211vap *vap = ni->ni_vap; 2267 struct ieee80211com *ic = vap->iv_ic; 2268 struct ieee80211_frame_min *wh; 2269 struct mbuf *m; 2270 uint16_t aid; 2271 int qlen; 2272 2273 wh = mtod(m0, struct ieee80211_frame_min *); 2274 if (ni->ni_associd == 0) { 2275 IEEE80211_DISCARD(vap, 2276 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2277 (struct ieee80211_frame *) wh, NULL, 2278 "%s", "unassociated station"); 2279 vap->iv_stats.is_ps_unassoc++; 2280 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2281 IEEE80211_REASON_NOT_ASSOCED); 2282 return; 2283 } 2284 2285 aid = le16toh(*(uint16_t *)wh->i_dur); 2286 if (aid != ni->ni_associd) { 2287 IEEE80211_DISCARD(vap, 2288 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2289 (struct ieee80211_frame *) wh, NULL, 2290 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2291 ni->ni_associd, aid); 2292 vap->iv_stats.is_ps_badaid++; 2293 /* 2294 * NB: We used to deauth the station but it turns out 2295 * the Blackberry Curve 8230 (and perhaps other devices) 2296 * sometimes send the wrong AID when WME is negotiated. 2297 * Being more lenient here seems ok as we already check 2298 * the station is associated and we only return frames 2299 * queued for the station (i.e. we don't use the AID). 2300 */ 2301 return; 2302 } 2303 2304 /* Okay, take the first queued packet and put it out... */ 2305 m = ieee80211_node_psq_dequeue(ni, &qlen); 2306 if (m == NULL) { 2307 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2308 "%s", "recv ps-poll, but queue empty"); 2309 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2310 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2311 if (vap->iv_set_tim != NULL) 2312 vap->iv_set_tim(ni, 0); /* just in case */ 2313 return; 2314 } 2315 /* 2316 * If there are more packets, set the more packets bit 2317 * in the packet dispatched to the station; otherwise 2318 * turn off the TIM bit. 2319 */ 2320 if (qlen != 0) { 2321 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2322 "recv ps-poll, send packet, %u still queued", qlen); 2323 m->m_flags |= M_MORE_DATA; 2324 } else { 2325 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2326 "%s", "recv ps-poll, send packet, queue empty"); 2327 if (vap->iv_set_tim != NULL) 2328 vap->iv_set_tim(ni, 0); 2329 } 2330 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2331 2332 /* 2333 * Do the right thing; if it's an encap'ed frame then 2334 * call ieee80211_parent_xmitpkt() (and free the ref) else 2335 * call ieee80211_vap_xmitpkt(). 2336 */ 2337 if (m->m_flags & M_ENCAP) { 2338 if (ieee80211_parent_xmitpkt(ic, m) != 0) 2339 ieee80211_free_node(ni); 2340 } else { 2341 (void) ieee80211_vap_xmitpkt(vap, m); 2342 } 2343} 2344