ieee80211_hostap.c revision 254523
1168404Spjd/*- 2168404Spjd * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3168404Spjd * All rights reserved. 4168404Spjd * 5168404Spjd * Redistribution and use in source and binary forms, with or without 6168404Spjd * modification, are permitted provided that the following conditions 7168404Spjd * are met: 8168404Spjd * 1. Redistributions of source code must retain the above copyright 9168404Spjd * notice, this list of conditions and the following disclaimer. 10168404Spjd * 2. Redistributions in binary form must reproduce the above copyright 11168404Spjd * notice, this list of conditions and the following disclaimer in the 12168404Spjd * documentation and/or other materials provided with the distribution. 13168404Spjd * 14168404Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15168404Spjd * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16168404Spjd * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17168404Spjd * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18168404Spjd * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19168404Spjd * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20168404Spjd * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21168404Spjd * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22168404Spjd * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23168404Spjd * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24168404Spjd */ 25168404Spjd 26168404Spjd#include <sys/cdefs.h> 27168404Spjd#ifdef __FreeBSD__ 28168404Spjd__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_hostap.c 254523 2013-08-19 13:27:32Z andre $"); 29168404Spjd#endif 30168404Spjd 31168404Spjd/* 32168404Spjd * IEEE 802.11 HOSTAP mode support. 33185029Spjd */ 34168404Spjd#include "opt_inet.h" 35168404Spjd#include "opt_wlan.h" 36168404Spjd 37168404Spjd#include <sys/param.h> 38168404Spjd#include <sys/systm.h> 39168404Spjd#include <sys/mbuf.h> 40168404Spjd#include <sys/malloc.h> 41168404Spjd#include <sys/kernel.h> 42168404Spjd 43168404Spjd#include <sys/socket.h> 44168404Spjd#include <sys/sockio.h> 45168404Spjd#include <sys/endian.h> 46168404Spjd#include <sys/errno.h> 47168404Spjd#include <sys/proc.h> 48168404Spjd#include <sys/sysctl.h> 49168404Spjd 50168404Spjd#include <net/if.h> 51168404Spjd#include <net/if_media.h> 52168404Spjd#include <net/if_llc.h> 53168404Spjd#include <net/ethernet.h> 54168404Spjd 55168404Spjd#include <net/bpf.h> 56168404Spjd 57168404Spjd#include <net80211/ieee80211_var.h> 58168404Spjd#include <net80211/ieee80211_hostap.h> 59168404Spjd#include <net80211/ieee80211_input.h> 60168404Spjd#ifdef IEEE80211_SUPPORT_SUPERG 61168404Spjd#include <net80211/ieee80211_superg.h> 62168404Spjd#endif 63168404Spjd#include <net80211/ieee80211_wds.h> 64168404Spjd 65168404Spjd#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 66168404Spjd 67168404Spjdstatic void hostap_vattach(struct ieee80211vap *); 68168404Spjdstatic int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69168404Spjdstatic int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 70168404Spjd int rssi, int nf); 71168404Spjdstatic void hostap_deliver_data(struct ieee80211vap *, 72168404Spjd struct ieee80211_node *, struct mbuf *); 73168404Spjdstatic void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74168404Spjd int subtype, int rssi, int nf); 75168404Spjdstatic void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 76168404Spjd 77168404Spjdvoid 78168404Spjdieee80211_hostap_attach(struct ieee80211com *ic) 79227703Spjd{ 80168404Spjd ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 81168404Spjd} 82168404Spjd 83168404Spjdvoid 84168404Spjdieee80211_hostap_detach(struct ieee80211com *ic) 85168404Spjd{ 86168404Spjd} 87168404Spjd 88168404Spjdstatic void 89227703Spjdhostap_vdetach(struct ieee80211vap *vap) 90168404Spjd{ 91168404Spjd} 92227703Spjd 93227703Spjdstatic void 94227703Spjdhostap_vattach(struct ieee80211vap *vap) 95168404Spjd{ 96168404Spjd vap->iv_newstate = hostap_newstate; 97168404Spjd vap->iv_input = hostap_input; 98168404Spjd vap->iv_recv_mgmt = hostap_recv_mgmt; 99168404Spjd vap->iv_recv_ctl = hostap_recv_ctl; 100168404Spjd vap->iv_opdetach = hostap_vdetach; 101168404Spjd vap->iv_deliver_data = hostap_deliver_data; 102168404Spjd vap->iv_recv_pspoll = ieee80211_recv_pspoll; 103168404Spjd} 104168404Spjd 105static void 106sta_disassoc(void *arg, struct ieee80211_node *ni) 107{ 108 struct ieee80211vap *vap = arg; 109 110 if (ni->ni_vap == vap && ni->ni_associd != 0) { 111 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 112 IEEE80211_REASON_ASSOC_LEAVE); 113 ieee80211_node_leave(ni); 114 } 115} 116 117static void 118sta_csa(void *arg, struct ieee80211_node *ni) 119{ 120 struct ieee80211vap *vap = arg; 121 122 if (ni->ni_vap == vap && ni->ni_associd != 0) 123 if (ni->ni_inact > vap->iv_inact_init) { 124 ni->ni_inact = vap->iv_inact_init; 125 IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni, 126 "%s: inact %u", __func__, ni->ni_inact); 127 } 128} 129 130static void 131sta_drop(void *arg, struct ieee80211_node *ni) 132{ 133 struct ieee80211vap *vap = arg; 134 135 if (ni->ni_vap == vap && ni->ni_associd != 0) 136 ieee80211_node_leave(ni); 137} 138 139/* 140 * Does a channel change require associated stations to re-associate 141 * so protocol state is correct. This is used when doing CSA across 142 * bands or similar (e.g. HT -> legacy). 143 */ 144static int 145isbandchange(struct ieee80211com *ic) 146{ 147 return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) & 148 (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF | 149 IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0; 150} 151 152/* 153 * IEEE80211_M_HOSTAP vap state machine handler. 154 */ 155static int 156hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 157{ 158 struct ieee80211com *ic = vap->iv_ic; 159 enum ieee80211_state ostate; 160 161 IEEE80211_LOCK_ASSERT(ic); 162 163 ostate = vap->iv_state; 164 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 165 __func__, ieee80211_state_name[ostate], 166 ieee80211_state_name[nstate], arg); 167 vap->iv_state = nstate; /* state transition */ 168 if (ostate != IEEE80211_S_SCAN) 169 ieee80211_cancel_scan(vap); /* background scan */ 170 switch (nstate) { 171 case IEEE80211_S_INIT: 172 switch (ostate) { 173 case IEEE80211_S_SCAN: 174 ieee80211_cancel_scan(vap); 175 break; 176 case IEEE80211_S_CAC: 177 ieee80211_dfs_cac_stop(vap); 178 break; 179 case IEEE80211_S_RUN: 180 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 181 break; 182 default: 183 break; 184 } 185 if (ostate != IEEE80211_S_INIT) { 186 /* NB: optimize INIT -> INIT case */ 187 ieee80211_reset_bss(vap); 188 } 189 if (vap->iv_auth->ia_detach != NULL) 190 vap->iv_auth->ia_detach(vap); 191 break; 192 case IEEE80211_S_SCAN: 193 switch (ostate) { 194 case IEEE80211_S_CSA: 195 case IEEE80211_S_RUN: 196 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 197 /* 198 * Clear overlapping BSS state; the beacon frame 199 * will be reconstructed on transition to the RUN 200 * state and the timeout routines check if the flag 201 * is set before doing anything so this is sufficient. 202 */ 203 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 204 ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR; 205 /* fall thru... */ 206 case IEEE80211_S_CAC: 207 /* 208 * NB: We may get here because of a manual channel 209 * change in which case we need to stop CAC 210 * XXX no need to stop if ostate RUN but it's ok 211 */ 212 ieee80211_dfs_cac_stop(vap); 213 /* fall thru... */ 214 case IEEE80211_S_INIT: 215 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 216 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 217 /* 218 * Already have a channel; bypass the 219 * scan and startup immediately. 220 * ieee80211_create_ibss will call back to 221 * move us to RUN state. 222 */ 223 ieee80211_create_ibss(vap, vap->iv_des_chan); 224 break; 225 } 226 /* 227 * Initiate a scan. We can come here as a result 228 * of an IEEE80211_IOC_SCAN_REQ too in which case 229 * the vap will be marked with IEEE80211_FEXT_SCANREQ 230 * and the scan request parameters will be present 231 * in iv_scanreq. Otherwise we do the default. 232 */ 233 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 234 ieee80211_check_scan(vap, 235 vap->iv_scanreq_flags, 236 vap->iv_scanreq_duration, 237 vap->iv_scanreq_mindwell, 238 vap->iv_scanreq_maxdwell, 239 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 240 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 241 } else 242 ieee80211_check_scan_current(vap); 243 break; 244 case IEEE80211_S_SCAN: 245 /* 246 * A state change requires a reset; scan. 247 */ 248 ieee80211_check_scan_current(vap); 249 break; 250 default: 251 break; 252 } 253 break; 254 case IEEE80211_S_CAC: 255 /* 256 * Start CAC on a DFS channel. We come here when starting 257 * a bss on a DFS channel (see ieee80211_create_ibss). 258 */ 259 ieee80211_dfs_cac_start(vap); 260 break; 261 case IEEE80211_S_RUN: 262 if (vap->iv_flags & IEEE80211_F_WPA) { 263 /* XXX validate prerequisites */ 264 } 265 switch (ostate) { 266 case IEEE80211_S_INIT: 267 /* 268 * Already have a channel; bypass the 269 * scan and startup immediately. 270 * Note that ieee80211_create_ibss will call 271 * back to do a RUN->RUN state change. 272 */ 273 ieee80211_create_ibss(vap, 274 ieee80211_ht_adjust_channel(ic, 275 ic->ic_curchan, vap->iv_flags_ht)); 276 /* NB: iv_bss is changed on return */ 277 break; 278 case IEEE80211_S_CAC: 279 /* 280 * NB: This is the normal state change when CAC 281 * expires and no radar was detected; no need to 282 * clear the CAC timer as it's already expired. 283 */ 284 /* fall thru... */ 285 case IEEE80211_S_CSA: 286 /* 287 * Shorten inactivity timer of associated stations 288 * to weed out sta's that don't follow a CSA. 289 */ 290 ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap); 291 /* 292 * Update bss node channel to reflect where 293 * we landed after CSA. 294 */ 295 ieee80211_node_set_chan(vap->iv_bss, 296 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 297 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 298 /* XXX bypass debug msgs */ 299 break; 300 case IEEE80211_S_SCAN: 301 case IEEE80211_S_RUN: 302#ifdef IEEE80211_DEBUG 303 if (ieee80211_msg_debug(vap)) { 304 struct ieee80211_node *ni = vap->iv_bss; 305 ieee80211_note(vap, 306 "synchronized with %s ssid ", 307 ether_sprintf(ni->ni_bssid)); 308 ieee80211_print_essid(ni->ni_essid, 309 ni->ni_esslen); 310 /* XXX MCS/HT */ 311 printf(" channel %d start %uMb\n", 312 ieee80211_chan2ieee(ic, ic->ic_curchan), 313 IEEE80211_RATE2MBS(ni->ni_txrate)); 314 } 315#endif 316 break; 317 default: 318 break; 319 } 320 /* 321 * Start/stop the authenticator. We delay until here 322 * to allow configuration to happen out of order. 323 */ 324 if (vap->iv_auth->ia_attach != NULL) { 325 /* XXX check failure */ 326 vap->iv_auth->ia_attach(vap); 327 } else if (vap->iv_auth->ia_detach != NULL) { 328 vap->iv_auth->ia_detach(vap); 329 } 330 ieee80211_node_authorize(vap->iv_bss); 331 break; 332 case IEEE80211_S_CSA: 333 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) { 334 /* 335 * On a ``band change'' silently drop associated 336 * stations as they must re-associate before they 337 * can pass traffic (as otherwise protocol state 338 * such as capabilities and the negotiated rate 339 * set may/will be wrong). 340 */ 341 ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap); 342 } 343 break; 344 default: 345 break; 346 } 347 return 0; 348} 349 350static void 351hostap_deliver_data(struct ieee80211vap *vap, 352 struct ieee80211_node *ni, struct mbuf *m) 353{ 354 struct ether_header *eh = mtod(m, struct ether_header *); 355 struct ifnet *ifp = vap->iv_ifp; 356 357 /* clear driver/net80211 flags before passing up */ 358 m->m_flags &= ~(M_MCAST | M_BCAST); 359 m_clrprotoflags(m); 360 361 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 362 ("gack, opmode %d", vap->iv_opmode)); 363 /* 364 * Do accounting. 365 */ 366 ifp->if_ipackets++; 367 IEEE80211_NODE_STAT(ni, rx_data); 368 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 369 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 370 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 371 IEEE80211_NODE_STAT(ni, rx_mcast); 372 } else 373 IEEE80211_NODE_STAT(ni, rx_ucast); 374 375 /* perform as a bridge within the AP */ 376 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 377 struct mbuf *mcopy = NULL; 378 379 if (m->m_flags & M_MCAST) { 380 mcopy = m_dup(m, M_NOWAIT); 381 if (mcopy == NULL) 382 ifp->if_oerrors++; 383 else 384 mcopy->m_flags |= M_MCAST; 385 } else { 386 /* 387 * Check if the destination is associated with the 388 * same vap and authorized to receive traffic. 389 * Beware of traffic destined for the vap itself; 390 * sending it will not work; just let it be delivered 391 * normally. 392 */ 393 struct ieee80211_node *sta = ieee80211_find_vap_node( 394 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 395 if (sta != NULL) { 396 if (ieee80211_node_is_authorized(sta)) { 397 /* 398 * Beware of sending to ourself; this 399 * needs to happen via the normal 400 * input path. 401 */ 402 if (sta != vap->iv_bss) { 403 mcopy = m; 404 m = NULL; 405 } 406 } else { 407 vap->iv_stats.is_rx_unauth++; 408 IEEE80211_NODE_STAT(sta, rx_unauth); 409 } 410 ieee80211_free_node(sta); 411 } 412 } 413 if (mcopy != NULL) { 414 int len, err; 415 len = mcopy->m_pkthdr.len; 416 err = ieee80211_vap_xmitpkt(vap, mcopy); 417 if (err) { 418 /* NB: IFQ_HANDOFF reclaims mcopy */ 419 } else { 420 ifp->if_opackets++; 421 } 422 } 423 } 424 if (m != NULL) { 425 /* 426 * Mark frame as coming from vap's interface. 427 */ 428 m->m_pkthdr.rcvif = ifp; 429 if (m->m_flags & M_MCAST) { 430 /* 431 * Spam DWDS vap's w/ multicast traffic. 432 */ 433 /* XXX only if dwds in use? */ 434 ieee80211_dwds_mcast(vap, m); 435 } 436 if (ni->ni_vlan != 0) { 437 /* attach vlan tag */ 438 m->m_pkthdr.ether_vtag = ni->ni_vlan; 439 m->m_flags |= M_VLANTAG; 440 } 441 ifp->if_input(ifp, m); 442 } 443} 444 445/* 446 * Decide if a received management frame should be 447 * printed when debugging is enabled. This filters some 448 * of the less interesting frames that come frequently 449 * (e.g. beacons). 450 */ 451static __inline int 452doprint(struct ieee80211vap *vap, int subtype) 453{ 454 switch (subtype) { 455 case IEEE80211_FC0_SUBTYPE_BEACON: 456 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 457 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 458 return 0; 459 } 460 return 1; 461} 462 463/* 464 * Process a received frame. The node associated with the sender 465 * should be supplied. If nothing was found in the node table then 466 * the caller is assumed to supply a reference to iv_bss instead. 467 * The RSSI and a timestamp are also supplied. The RSSI data is used 468 * during AP scanning to select a AP to associate with; it can have 469 * any units so long as values have consistent units and higher values 470 * mean ``better signal''. The receive timestamp is currently not used 471 * by the 802.11 layer. 472 */ 473static int 474hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 475{ 476#define HAS_SEQ(type) ((type & 0x4) == 0) 477 struct ieee80211vap *vap = ni->ni_vap; 478 struct ieee80211com *ic = ni->ni_ic; 479 struct ifnet *ifp = vap->iv_ifp; 480 struct ieee80211_frame *wh; 481 struct ieee80211_key *key; 482 struct ether_header *eh; 483 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 484 uint8_t dir, type, subtype, qos; 485 uint8_t *bssid; 486 uint16_t rxseq; 487 488 if (m->m_flags & M_AMPDU_MPDU) { 489 /* 490 * Fastpath for A-MPDU reorder q resubmission. Frames 491 * w/ M_AMPDU_MPDU marked have already passed through 492 * here but were received out of order and been held on 493 * the reorder queue. When resubmitted they are marked 494 * with the M_AMPDU_MPDU flag and we can bypass most of 495 * the normal processing. 496 */ 497 wh = mtod(m, struct ieee80211_frame *); 498 type = IEEE80211_FC0_TYPE_DATA; 499 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 500 subtype = IEEE80211_FC0_SUBTYPE_QOS; 501 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 502 goto resubmit_ampdu; 503 } 504 505 KASSERT(ni != NULL, ("null node")); 506 ni->ni_inact = ni->ni_inact_reload; 507 508 type = -1; /* undefined */ 509 510 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 511 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 512 ni->ni_macaddr, NULL, 513 "too short (1): len %u", m->m_pkthdr.len); 514 vap->iv_stats.is_rx_tooshort++; 515 goto out; 516 } 517 /* 518 * Bit of a cheat here, we use a pointer for a 3-address 519 * frame format but don't reference fields past outside 520 * ieee80211_frame_min w/o first validating the data is 521 * present. 522 */ 523 wh = mtod(m, struct ieee80211_frame *); 524 525 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 526 IEEE80211_FC0_VERSION_0) { 527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 528 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 529 wh->i_fc[0], wh->i_fc[1]); 530 vap->iv_stats.is_rx_badversion++; 531 goto err; 532 } 533 534 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 535 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 536 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 537 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 538 if (dir != IEEE80211_FC1_DIR_NODS) 539 bssid = wh->i_addr1; 540 else if (type == IEEE80211_FC0_TYPE_CTL) 541 bssid = wh->i_addr1; 542 else { 543 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 544 IEEE80211_DISCARD_MAC(vap, 545 IEEE80211_MSG_ANY, ni->ni_macaddr, 546 NULL, "too short (2): len %u", 547 m->m_pkthdr.len); 548 vap->iv_stats.is_rx_tooshort++; 549 goto out; 550 } 551 bssid = wh->i_addr3; 552 } 553 /* 554 * Validate the bssid. 555 */ 556 if (!(type == IEEE80211_FC0_TYPE_MGT && 557 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 558 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 559 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 560 /* not interested in */ 561 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 562 bssid, NULL, "%s", "not to bss"); 563 vap->iv_stats.is_rx_wrongbss++; 564 goto out; 565 } 566 567 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 568 ni->ni_noise = nf; 569 if (HAS_SEQ(type)) { 570 uint8_t tid = ieee80211_gettid(wh); 571 if (IEEE80211_QOS_HAS_SEQ(wh) && 572 TID_TO_WME_AC(tid) >= WME_AC_VI) 573 ic->ic_wme.wme_hipri_traffic++; 574 rxseq = le16toh(*(uint16_t *)wh->i_seq); 575 if (! ieee80211_check_rxseq(ni, wh)) { 576 /* duplicate, discard */ 577 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 578 bssid, "duplicate", 579 "seqno <%u,%u> fragno <%u,%u> tid %u", 580 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 581 ni->ni_rxseqs[tid] >> 582 IEEE80211_SEQ_SEQ_SHIFT, 583 rxseq & IEEE80211_SEQ_FRAG_MASK, 584 ni->ni_rxseqs[tid] & 585 IEEE80211_SEQ_FRAG_MASK, 586 tid); 587 vap->iv_stats.is_rx_dup++; 588 IEEE80211_NODE_STAT(ni, rx_dup); 589 goto out; 590 } 591 ni->ni_rxseqs[tid] = rxseq; 592 } 593 } 594 595 switch (type) { 596 case IEEE80211_FC0_TYPE_DATA: 597 hdrspace = ieee80211_hdrspace(ic, wh); 598 if (m->m_len < hdrspace && 599 (m = m_pullup(m, hdrspace)) == NULL) { 600 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 601 ni->ni_macaddr, NULL, 602 "data too short: expecting %u", hdrspace); 603 vap->iv_stats.is_rx_tooshort++; 604 goto out; /* XXX */ 605 } 606 if (!(dir == IEEE80211_FC1_DIR_TODS || 607 (dir == IEEE80211_FC1_DIR_DSTODS && 608 (vap->iv_flags & IEEE80211_F_DWDS)))) { 609 if (dir != IEEE80211_FC1_DIR_DSTODS) { 610 IEEE80211_DISCARD(vap, 611 IEEE80211_MSG_INPUT, wh, "data", 612 "incorrect dir 0x%x", dir); 613 } else { 614 IEEE80211_DISCARD(vap, 615 IEEE80211_MSG_INPUT | 616 IEEE80211_MSG_WDS, wh, 617 "4-address data", 618 "%s", "DWDS not enabled"); 619 } 620 vap->iv_stats.is_rx_wrongdir++; 621 goto out; 622 } 623 /* check if source STA is associated */ 624 if (ni == vap->iv_bss) { 625 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 626 wh, "data", "%s", "unknown src"); 627 ieee80211_send_error(ni, wh->i_addr2, 628 IEEE80211_FC0_SUBTYPE_DEAUTH, 629 IEEE80211_REASON_NOT_AUTHED); 630 vap->iv_stats.is_rx_notassoc++; 631 goto err; 632 } 633 if (ni->ni_associd == 0) { 634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 635 wh, "data", "%s", "unassoc src"); 636 IEEE80211_SEND_MGMT(ni, 637 IEEE80211_FC0_SUBTYPE_DISASSOC, 638 IEEE80211_REASON_NOT_ASSOCED); 639 vap->iv_stats.is_rx_notassoc++; 640 goto err; 641 } 642 643 /* 644 * Check for power save state change. 645 * XXX out-of-order A-MPDU frames? 646 */ 647 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 648 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 649 vap->iv_node_ps(ni, 650 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 651 /* 652 * For 4-address packets handle WDS discovery 653 * notifications. Once a WDS link is setup frames 654 * are just delivered to the WDS vap (see below). 655 */ 656 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 657 if (!ieee80211_node_is_authorized(ni)) { 658 IEEE80211_DISCARD(vap, 659 IEEE80211_MSG_INPUT | 660 IEEE80211_MSG_WDS, wh, 661 "4-address data", 662 "%s", "unauthorized port"); 663 vap->iv_stats.is_rx_unauth++; 664 IEEE80211_NODE_STAT(ni, rx_unauth); 665 goto err; 666 } 667 ieee80211_dwds_discover(ni, m); 668 return type; 669 } 670 671 /* 672 * Handle A-MPDU re-ordering. If the frame is to be 673 * processed directly then ieee80211_ampdu_reorder 674 * will return 0; otherwise it has consumed the mbuf 675 * and we should do nothing more with it. 676 */ 677 if ((m->m_flags & M_AMPDU) && 678 ieee80211_ampdu_reorder(ni, m) != 0) { 679 m = NULL; 680 goto out; 681 } 682 resubmit_ampdu: 683 684 /* 685 * Handle privacy requirements. Note that we 686 * must not be preempted from here until after 687 * we (potentially) call ieee80211_crypto_demic; 688 * otherwise we may violate assumptions in the 689 * crypto cipher modules used to do delayed update 690 * of replay sequence numbers. 691 */ 692 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 693 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 694 /* 695 * Discard encrypted frames when privacy is off. 696 */ 697 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 698 wh, "WEP", "%s", "PRIVACY off"); 699 vap->iv_stats.is_rx_noprivacy++; 700 IEEE80211_NODE_STAT(ni, rx_noprivacy); 701 goto out; 702 } 703 key = ieee80211_crypto_decap(ni, m, hdrspace); 704 if (key == NULL) { 705 /* NB: stats+msgs handled in crypto_decap */ 706 IEEE80211_NODE_STAT(ni, rx_wepfail); 707 goto out; 708 } 709 wh = mtod(m, struct ieee80211_frame *); 710 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 711 } else { 712 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 713 key = NULL; 714 } 715 716 /* 717 * Save QoS bits for use below--before we strip the header. 718 */ 719 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 720 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 721 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 722 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 723 } else 724 qos = 0; 725 726 /* 727 * Next up, any fragmentation. 728 */ 729 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 730 m = ieee80211_defrag(ni, m, hdrspace); 731 if (m == NULL) { 732 /* Fragment dropped or frame not complete yet */ 733 goto out; 734 } 735 } 736 wh = NULL; /* no longer valid, catch any uses */ 737 738 /* 739 * Next strip any MSDU crypto bits. 740 */ 741 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 742 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 743 ni->ni_macaddr, "data", "%s", "demic error"); 744 vap->iv_stats.is_rx_demicfail++; 745 IEEE80211_NODE_STAT(ni, rx_demicfail); 746 goto out; 747 } 748 /* copy to listener after decrypt */ 749 if (ieee80211_radiotap_active_vap(vap)) 750 ieee80211_radiotap_rx(vap, m); 751 need_tap = 0; 752 /* 753 * Finally, strip the 802.11 header. 754 */ 755 m = ieee80211_decap(vap, m, hdrspace); 756 if (m == NULL) { 757 /* XXX mask bit to check for both */ 758 /* don't count Null data frames as errors */ 759 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 760 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 761 goto out; 762 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 763 ni->ni_macaddr, "data", "%s", "decap error"); 764 vap->iv_stats.is_rx_decap++; 765 IEEE80211_NODE_STAT(ni, rx_decap); 766 goto err; 767 } 768 eh = mtod(m, struct ether_header *); 769 if (!ieee80211_node_is_authorized(ni)) { 770 /* 771 * Deny any non-PAE frames received prior to 772 * authorization. For open/shared-key 773 * authentication the port is mark authorized 774 * after authentication completes. For 802.1x 775 * the port is not marked authorized by the 776 * authenticator until the handshake has completed. 777 */ 778 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 779 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 780 eh->ether_shost, "data", 781 "unauthorized port: ether type 0x%x len %u", 782 eh->ether_type, m->m_pkthdr.len); 783 vap->iv_stats.is_rx_unauth++; 784 IEEE80211_NODE_STAT(ni, rx_unauth); 785 goto err; 786 } 787 } else { 788 /* 789 * When denying unencrypted frames, discard 790 * any non-PAE frames received without encryption. 791 */ 792 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 793 (key == NULL && (m->m_flags & M_WEP) == 0) && 794 eh->ether_type != htons(ETHERTYPE_PAE)) { 795 /* 796 * Drop unencrypted frames. 797 */ 798 vap->iv_stats.is_rx_unencrypted++; 799 IEEE80211_NODE_STAT(ni, rx_unencrypted); 800 goto out; 801 } 802 } 803 /* XXX require HT? */ 804 if (qos & IEEE80211_QOS_AMSDU) { 805 m = ieee80211_decap_amsdu(ni, m); 806 if (m == NULL) 807 return IEEE80211_FC0_TYPE_DATA; 808 } else { 809#ifdef IEEE80211_SUPPORT_SUPERG 810 m = ieee80211_decap_fastframe(vap, ni, m); 811 if (m == NULL) 812 return IEEE80211_FC0_TYPE_DATA; 813#endif 814 } 815 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 816 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 817 else 818 hostap_deliver_data(vap, ni, m); 819 return IEEE80211_FC0_TYPE_DATA; 820 821 case IEEE80211_FC0_TYPE_MGT: 822 vap->iv_stats.is_rx_mgmt++; 823 IEEE80211_NODE_STAT(ni, rx_mgmt); 824 if (dir != IEEE80211_FC1_DIR_NODS) { 825 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 826 wh, "mgt", "incorrect dir 0x%x", dir); 827 vap->iv_stats.is_rx_wrongdir++; 828 goto err; 829 } 830 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 831 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 832 ni->ni_macaddr, "mgt", "too short: len %u", 833 m->m_pkthdr.len); 834 vap->iv_stats.is_rx_tooshort++; 835 goto out; 836 } 837 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 838 /* ensure return frames are unicast */ 839 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 840 wh, NULL, "source is multicast: %s", 841 ether_sprintf(wh->i_addr2)); 842 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 843 goto out; 844 } 845#ifdef IEEE80211_DEBUG 846 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 847 ieee80211_msg_dumppkts(vap)) { 848 if_printf(ifp, "received %s from %s rssi %d\n", 849 ieee80211_mgt_subtype_name[subtype >> 850 IEEE80211_FC0_SUBTYPE_SHIFT], 851 ether_sprintf(wh->i_addr2), rssi); 852 } 853#endif 854 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 855 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 856 /* 857 * Only shared key auth frames with a challenge 858 * should be encrypted, discard all others. 859 */ 860 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 861 wh, NULL, 862 "%s", "WEP set but not permitted"); 863 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 864 goto out; 865 } 866 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 867 /* 868 * Discard encrypted frames when privacy is off. 869 */ 870 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 871 wh, NULL, "%s", "WEP set but PRIVACY off"); 872 vap->iv_stats.is_rx_noprivacy++; 873 goto out; 874 } 875 hdrspace = ieee80211_hdrspace(ic, wh); 876 key = ieee80211_crypto_decap(ni, m, hdrspace); 877 if (key == NULL) { 878 /* NB: stats+msgs handled in crypto_decap */ 879 goto out; 880 } 881 wh = mtod(m, struct ieee80211_frame *); 882 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 883 } 884 /* 885 * Pass the packet to radiotap before calling iv_recv_mgmt(). 886 * Otherwise iv_recv_mgmt() might pass another packet to 887 * radiotap, resulting in out of order packet captures. 888 */ 889 if (ieee80211_radiotap_active_vap(vap)) 890 ieee80211_radiotap_rx(vap, m); 891 need_tap = 0; 892 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 893 goto out; 894 895 case IEEE80211_FC0_TYPE_CTL: 896 vap->iv_stats.is_rx_ctl++; 897 IEEE80211_NODE_STAT(ni, rx_ctrl); 898 vap->iv_recv_ctl(ni, m, subtype); 899 goto out; 900 default: 901 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 902 wh, "bad", "frame type 0x%x", type); 903 /* should not come here */ 904 break; 905 } 906err: 907 ifp->if_ierrors++; 908out: 909 if (m != NULL) { 910 if (need_tap && ieee80211_radiotap_active_vap(vap)) 911 ieee80211_radiotap_rx(vap, m); 912 m_freem(m); 913 } 914 return type; 915} 916 917static void 918hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 919 int rssi, int nf, uint16_t seq, uint16_t status) 920{ 921 struct ieee80211vap *vap = ni->ni_vap; 922 923 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 924 925 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 926 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 927 ni->ni_macaddr, "open auth", 928 "bad sta auth mode %u", ni->ni_authmode); 929 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 930 /* 931 * Clear any challenge text that may be there if 932 * a previous shared key auth failed and then an 933 * open auth is attempted. 934 */ 935 if (ni->ni_challenge != NULL) { 936 free(ni->ni_challenge, M_80211_NODE); 937 ni->ni_challenge = NULL; 938 } 939 /* XXX hack to workaround calling convention */ 940 ieee80211_send_error(ni, wh->i_addr2, 941 IEEE80211_FC0_SUBTYPE_AUTH, 942 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 943 return; 944 } 945 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 946 vap->iv_stats.is_rx_bad_auth++; 947 return; 948 } 949 /* always accept open authentication requests */ 950 if (ni == vap->iv_bss) { 951 ni = ieee80211_dup_bss(vap, wh->i_addr2); 952 if (ni == NULL) 953 return; 954 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 955 (void) ieee80211_ref_node(ni); 956 /* 957 * Mark the node as referenced to reflect that it's 958 * reference count has been bumped to insure it remains 959 * after the transaction completes. 960 */ 961 ni->ni_flags |= IEEE80211_NODE_AREF; 962 /* 963 * Mark the node as requiring a valid association id 964 * before outbound traffic is permitted. 965 */ 966 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 967 968 if (vap->iv_acl != NULL && 969 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 970 /* 971 * When the ACL policy is set to RADIUS we defer the 972 * authorization to a user agent. Dispatch an event, 973 * a subsequent MLME call will decide the fate of the 974 * station. If the user agent is not present then the 975 * node will be reclaimed due to inactivity. 976 */ 977 IEEE80211_NOTE_MAC(vap, 978 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 979 "%s", "station authentication defered (radius acl)"); 980 ieee80211_notify_node_auth(ni); 981 } else { 982 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 983 IEEE80211_NOTE_MAC(vap, 984 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 985 "%s", "station authenticated (open)"); 986 /* 987 * When 802.1x is not in use mark the port 988 * authorized at this point so traffic can flow. 989 */ 990 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 991 ieee80211_node_authorize(ni); 992 } 993} 994 995static void 996hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 997 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 998 uint16_t seq, uint16_t status) 999{ 1000 struct ieee80211vap *vap = ni->ni_vap; 1001 uint8_t *challenge; 1002 int allocbs, estatus; 1003 1004 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1005 1006 /* 1007 * NB: this can happen as we allow pre-shared key 1008 * authentication to be enabled w/o wep being turned 1009 * on so that configuration of these can be done 1010 * in any order. It may be better to enforce the 1011 * ordering in which case this check would just be 1012 * for sanity/consistency. 1013 */ 1014 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1015 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1016 ni->ni_macaddr, "shared key auth", 1017 "%s", " PRIVACY is disabled"); 1018 estatus = IEEE80211_STATUS_ALG; 1019 goto bad; 1020 } 1021 /* 1022 * Pre-shared key authentication is evil; accept 1023 * it only if explicitly configured (it is supported 1024 * mainly for compatibility with clients like Mac OS X). 1025 */ 1026 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1027 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1028 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1029 ni->ni_macaddr, "shared key auth", 1030 "bad sta auth mode %u", ni->ni_authmode); 1031 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1032 estatus = IEEE80211_STATUS_ALG; 1033 goto bad; 1034 } 1035 1036 challenge = NULL; 1037 if (frm + 1 < efrm) { 1038 if ((frm[1] + 2) > (efrm - frm)) { 1039 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1040 ni->ni_macaddr, "shared key auth", 1041 "ie %d/%d too long", 1042 frm[0], (frm[1] + 2) - (efrm - frm)); 1043 vap->iv_stats.is_rx_bad_auth++; 1044 estatus = IEEE80211_STATUS_CHALLENGE; 1045 goto bad; 1046 } 1047 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1048 challenge = frm; 1049 frm += frm[1] + 2; 1050 } 1051 switch (seq) { 1052 case IEEE80211_AUTH_SHARED_CHALLENGE: 1053 case IEEE80211_AUTH_SHARED_RESPONSE: 1054 if (challenge == NULL) { 1055 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1056 ni->ni_macaddr, "shared key auth", 1057 "%s", "no challenge"); 1058 vap->iv_stats.is_rx_bad_auth++; 1059 estatus = IEEE80211_STATUS_CHALLENGE; 1060 goto bad; 1061 } 1062 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1063 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1064 ni->ni_macaddr, "shared key auth", 1065 "bad challenge len %d", challenge[1]); 1066 vap->iv_stats.is_rx_bad_auth++; 1067 estatus = IEEE80211_STATUS_CHALLENGE; 1068 goto bad; 1069 } 1070 default: 1071 break; 1072 } 1073 switch (seq) { 1074 case IEEE80211_AUTH_SHARED_REQUEST: 1075 if (ni == vap->iv_bss) { 1076 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1077 if (ni == NULL) { 1078 /* NB: no way to return an error */ 1079 return; 1080 } 1081 allocbs = 1; 1082 } else { 1083 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1084 (void) ieee80211_ref_node(ni); 1085 allocbs = 0; 1086 } 1087 /* 1088 * Mark the node as referenced to reflect that it's 1089 * reference count has been bumped to insure it remains 1090 * after the transaction completes. 1091 */ 1092 ni->ni_flags |= IEEE80211_NODE_AREF; 1093 /* 1094 * Mark the node as requiring a valid associatio id 1095 * before outbound traffic is permitted. 1096 */ 1097 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1098 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1099 ni->ni_noise = nf; 1100 if (!ieee80211_alloc_challenge(ni)) { 1101 /* NB: don't return error so they rexmit */ 1102 return; 1103 } 1104 get_random_bytes(ni->ni_challenge, 1105 IEEE80211_CHALLENGE_LEN); 1106 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1107 ni, "shared key %sauth request", allocbs ? "" : "re"); 1108 /* 1109 * When the ACL policy is set to RADIUS we defer the 1110 * authorization to a user agent. Dispatch an event, 1111 * a subsequent MLME call will decide the fate of the 1112 * station. If the user agent is not present then the 1113 * node will be reclaimed due to inactivity. 1114 */ 1115 if (vap->iv_acl != NULL && 1116 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1117 IEEE80211_NOTE_MAC(vap, 1118 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1119 ni->ni_macaddr, 1120 "%s", "station authentication defered (radius acl)"); 1121 ieee80211_notify_node_auth(ni); 1122 return; 1123 } 1124 break; 1125 case IEEE80211_AUTH_SHARED_RESPONSE: 1126 if (ni == vap->iv_bss) { 1127 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1128 ni->ni_macaddr, "shared key response", 1129 "%s", "unknown station"); 1130 /* NB: don't send a response */ 1131 return; 1132 } 1133 if (ni->ni_challenge == NULL) { 1134 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1135 ni->ni_macaddr, "shared key response", 1136 "%s", "no challenge recorded"); 1137 vap->iv_stats.is_rx_bad_auth++; 1138 estatus = IEEE80211_STATUS_CHALLENGE; 1139 goto bad; 1140 } 1141 if (memcmp(ni->ni_challenge, &challenge[2], 1142 challenge[1]) != 0) { 1143 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1144 ni->ni_macaddr, "shared key response", 1145 "%s", "challenge mismatch"); 1146 vap->iv_stats.is_rx_auth_fail++; 1147 estatus = IEEE80211_STATUS_CHALLENGE; 1148 goto bad; 1149 } 1150 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1151 ni, "%s", "station authenticated (shared key)"); 1152 ieee80211_node_authorize(ni); 1153 break; 1154 default: 1155 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1156 ni->ni_macaddr, "shared key auth", 1157 "bad seq %d", seq); 1158 vap->iv_stats.is_rx_bad_auth++; 1159 estatus = IEEE80211_STATUS_SEQUENCE; 1160 goto bad; 1161 } 1162 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1163 return; 1164bad: 1165 /* 1166 * Send an error response; but only when operating as an AP. 1167 */ 1168 /* XXX hack to workaround calling convention */ 1169 ieee80211_send_error(ni, wh->i_addr2, 1170 IEEE80211_FC0_SUBTYPE_AUTH, 1171 (seq + 1) | (estatus<<16)); 1172} 1173 1174/* 1175 * Convert a WPA cipher selector OUI to an internal 1176 * cipher algorithm. Where appropriate we also 1177 * record any key length. 1178 */ 1179static int 1180wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1181{ 1182#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1183 uint32_t w = LE_READ_4(sel); 1184 1185 switch (w) { 1186 case WPA_SEL(WPA_CSE_NULL): 1187 return IEEE80211_CIPHER_NONE; 1188 case WPA_SEL(WPA_CSE_WEP40): 1189 if (keylen) 1190 *keylen = 40 / NBBY; 1191 return IEEE80211_CIPHER_WEP; 1192 case WPA_SEL(WPA_CSE_WEP104): 1193 if (keylen) 1194 *keylen = 104 / NBBY; 1195 return IEEE80211_CIPHER_WEP; 1196 case WPA_SEL(WPA_CSE_TKIP): 1197 return IEEE80211_CIPHER_TKIP; 1198 case WPA_SEL(WPA_CSE_CCMP): 1199 return IEEE80211_CIPHER_AES_CCM; 1200 } 1201 return 32; /* NB: so 1<< is discarded */ 1202#undef WPA_SEL 1203} 1204 1205/* 1206 * Convert a WPA key management/authentication algorithm 1207 * to an internal code. 1208 */ 1209static int 1210wpa_keymgmt(const uint8_t *sel) 1211{ 1212#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1213 uint32_t w = LE_READ_4(sel); 1214 1215 switch (w) { 1216 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1217 return WPA_ASE_8021X_UNSPEC; 1218 case WPA_SEL(WPA_ASE_8021X_PSK): 1219 return WPA_ASE_8021X_PSK; 1220 case WPA_SEL(WPA_ASE_NONE): 1221 return WPA_ASE_NONE; 1222 } 1223 return 0; /* NB: so is discarded */ 1224#undef WPA_SEL 1225} 1226 1227/* 1228 * Parse a WPA information element to collect parameters. 1229 * Note that we do not validate security parameters; that 1230 * is handled by the authenticator; the parsing done here 1231 * is just for internal use in making operational decisions. 1232 */ 1233static int 1234ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1235 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1236{ 1237 uint8_t len = frm[1]; 1238 uint32_t w; 1239 int n; 1240 1241 /* 1242 * Check the length once for fixed parts: OUI, type, 1243 * version, mcast cipher, and 2 selector counts. 1244 * Other, variable-length data, must be checked separately. 1245 */ 1246 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1247 IEEE80211_DISCARD_IE(vap, 1248 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1249 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1250 return IEEE80211_REASON_IE_INVALID; 1251 } 1252 if (len < 14) { 1253 IEEE80211_DISCARD_IE(vap, 1254 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1255 wh, "WPA", "too short, len %u", len); 1256 return IEEE80211_REASON_IE_INVALID; 1257 } 1258 frm += 6, len -= 4; /* NB: len is payload only */ 1259 /* NB: iswpaoui already validated the OUI and type */ 1260 w = LE_READ_2(frm); 1261 if (w != WPA_VERSION) { 1262 IEEE80211_DISCARD_IE(vap, 1263 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1264 wh, "WPA", "bad version %u", w); 1265 return IEEE80211_REASON_IE_INVALID; 1266 } 1267 frm += 2, len -= 2; 1268 1269 memset(rsn, 0, sizeof(*rsn)); 1270 1271 /* multicast/group cipher */ 1272 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1273 frm += 4, len -= 4; 1274 1275 /* unicast ciphers */ 1276 n = LE_READ_2(frm); 1277 frm += 2, len -= 2; 1278 if (len < n*4+2) { 1279 IEEE80211_DISCARD_IE(vap, 1280 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1281 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1282 len, n); 1283 return IEEE80211_REASON_IE_INVALID; 1284 } 1285 w = 0; 1286 for (; n > 0; n--) { 1287 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1288 frm += 4, len -= 4; 1289 } 1290 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1291 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1292 else 1293 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1294 1295 /* key management algorithms */ 1296 n = LE_READ_2(frm); 1297 frm += 2, len -= 2; 1298 if (len < n*4) { 1299 IEEE80211_DISCARD_IE(vap, 1300 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1301 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1302 len, n); 1303 return IEEE80211_REASON_IE_INVALID; 1304 } 1305 w = 0; 1306 for (; n > 0; n--) { 1307 w |= wpa_keymgmt(frm); 1308 frm += 4, len -= 4; 1309 } 1310 if (w & WPA_ASE_8021X_UNSPEC) 1311 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1312 else 1313 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1314 1315 if (len > 2) /* optional capabilities */ 1316 rsn->rsn_caps = LE_READ_2(frm); 1317 1318 return 0; 1319} 1320 1321/* 1322 * Convert an RSN cipher selector OUI to an internal 1323 * cipher algorithm. Where appropriate we also 1324 * record any key length. 1325 */ 1326static int 1327rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1328{ 1329#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1330 uint32_t w = LE_READ_4(sel); 1331 1332 switch (w) { 1333 case RSN_SEL(RSN_CSE_NULL): 1334 return IEEE80211_CIPHER_NONE; 1335 case RSN_SEL(RSN_CSE_WEP40): 1336 if (keylen) 1337 *keylen = 40 / NBBY; 1338 return IEEE80211_CIPHER_WEP; 1339 case RSN_SEL(RSN_CSE_WEP104): 1340 if (keylen) 1341 *keylen = 104 / NBBY; 1342 return IEEE80211_CIPHER_WEP; 1343 case RSN_SEL(RSN_CSE_TKIP): 1344 return IEEE80211_CIPHER_TKIP; 1345 case RSN_SEL(RSN_CSE_CCMP): 1346 return IEEE80211_CIPHER_AES_CCM; 1347 case RSN_SEL(RSN_CSE_WRAP): 1348 return IEEE80211_CIPHER_AES_OCB; 1349 } 1350 return 32; /* NB: so 1<< is discarded */ 1351#undef WPA_SEL 1352} 1353 1354/* 1355 * Convert an RSN key management/authentication algorithm 1356 * to an internal code. 1357 */ 1358static int 1359rsn_keymgmt(const uint8_t *sel) 1360{ 1361#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1362 uint32_t w = LE_READ_4(sel); 1363 1364 switch (w) { 1365 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1366 return RSN_ASE_8021X_UNSPEC; 1367 case RSN_SEL(RSN_ASE_8021X_PSK): 1368 return RSN_ASE_8021X_PSK; 1369 case RSN_SEL(RSN_ASE_NONE): 1370 return RSN_ASE_NONE; 1371 } 1372 return 0; /* NB: so is discarded */ 1373#undef RSN_SEL 1374} 1375 1376/* 1377 * Parse a WPA/RSN information element to collect parameters 1378 * and validate the parameters against what has been 1379 * configured for the system. 1380 */ 1381static int 1382ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1383 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1384{ 1385 uint8_t len = frm[1]; 1386 uint32_t w; 1387 int n; 1388 1389 /* 1390 * Check the length once for fixed parts: 1391 * version, mcast cipher, and 2 selector counts. 1392 * Other, variable-length data, must be checked separately. 1393 */ 1394 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1395 IEEE80211_DISCARD_IE(vap, 1396 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1397 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1398 return IEEE80211_REASON_IE_INVALID; 1399 } 1400 if (len < 10) { 1401 IEEE80211_DISCARD_IE(vap, 1402 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1403 wh, "RSN", "too short, len %u", len); 1404 return IEEE80211_REASON_IE_INVALID; 1405 } 1406 frm += 2; 1407 w = LE_READ_2(frm); 1408 if (w != RSN_VERSION) { 1409 IEEE80211_DISCARD_IE(vap, 1410 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1411 wh, "RSN", "bad version %u", w); 1412 return IEEE80211_REASON_IE_INVALID; 1413 } 1414 frm += 2, len -= 2; 1415 1416 memset(rsn, 0, sizeof(*rsn)); 1417 1418 /* multicast/group cipher */ 1419 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1420 frm += 4, len -= 4; 1421 1422 /* unicast ciphers */ 1423 n = LE_READ_2(frm); 1424 frm += 2, len -= 2; 1425 if (len < n*4+2) { 1426 IEEE80211_DISCARD_IE(vap, 1427 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1428 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1429 len, n); 1430 return IEEE80211_REASON_IE_INVALID; 1431 } 1432 w = 0; 1433 for (; n > 0; n--) { 1434 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1435 frm += 4, len -= 4; 1436 } 1437 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1438 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1439 else 1440 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1441 1442 /* key management algorithms */ 1443 n = LE_READ_2(frm); 1444 frm += 2, len -= 2; 1445 if (len < n*4) { 1446 IEEE80211_DISCARD_IE(vap, 1447 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1448 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1449 len, n); 1450 return IEEE80211_REASON_IE_INVALID; 1451 } 1452 w = 0; 1453 for (; n > 0; n--) { 1454 w |= rsn_keymgmt(frm); 1455 frm += 4, len -= 4; 1456 } 1457 if (w & RSN_ASE_8021X_UNSPEC) 1458 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1459 else 1460 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1461 1462 /* optional RSN capabilities */ 1463 if (len > 2) 1464 rsn->rsn_caps = LE_READ_2(frm); 1465 /* XXXPMKID */ 1466 1467 return 0; 1468} 1469 1470/* 1471 * WPA/802.11i assocation request processing. 1472 */ 1473static int 1474wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1475 const struct ieee80211_frame *wh, const uint8_t *wpa, 1476 const uint8_t *rsn, uint16_t capinfo) 1477{ 1478 struct ieee80211vap *vap = ni->ni_vap; 1479 uint8_t reason; 1480 int badwparsn; 1481 1482 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1483 if (wpa == NULL && rsn == NULL) { 1484 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1485 /* 1486 * W-Fi Protected Setup (WPS) permits 1487 * clients to associate and pass EAPOL frames 1488 * to establish initial credentials. 1489 */ 1490 ni->ni_flags |= IEEE80211_NODE_WPS; 1491 return 1; 1492 } 1493 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1494 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1495 /* 1496 * Transitional Security Network. Permits clients 1497 * to associate and use WEP while WPA is configured. 1498 */ 1499 ni->ni_flags |= IEEE80211_NODE_TSN; 1500 return 1; 1501 } 1502 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1503 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1504 vap->iv_stats.is_rx_assoc_badwpaie++; 1505 reason = IEEE80211_REASON_IE_INVALID; 1506 goto bad; 1507 } 1508 /* assert right association security credentials */ 1509 badwparsn = 0; /* NB: to silence compiler */ 1510 switch (vap->iv_flags & IEEE80211_F_WPA) { 1511 case IEEE80211_F_WPA1: 1512 badwparsn = (wpa == NULL); 1513 break; 1514 case IEEE80211_F_WPA2: 1515 badwparsn = (rsn == NULL); 1516 break; 1517 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1518 badwparsn = (wpa == NULL && rsn == NULL); 1519 break; 1520 } 1521 if (badwparsn) { 1522 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1523 wh, NULL, 1524 "%s", "missing WPA/RSN IE in association request"); 1525 vap->iv_stats.is_rx_assoc_badwpaie++; 1526 reason = IEEE80211_REASON_IE_INVALID; 1527 goto bad; 1528 } 1529 /* 1530 * Parse WPA/RSN information element. 1531 */ 1532 if (wpa != NULL) 1533 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1534 else 1535 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1536 if (reason != 0) { 1537 /* XXX distinguish WPA/RSN? */ 1538 vap->iv_stats.is_rx_assoc_badwpaie++; 1539 goto bad; 1540 } 1541 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1542 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1543 wpa != NULL ? "WPA" : "RSN", 1544 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1545 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1546 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1547 1548 return 1; 1549bad: 1550 ieee80211_node_deauth(ni, reason); 1551 return 0; 1552} 1553 1554/* XXX find a better place for definition */ 1555struct l2_update_frame { 1556 struct ether_header eh; 1557 uint8_t dsap; 1558 uint8_t ssap; 1559 uint8_t control; 1560 uint8_t xid[3]; 1561} __packed; 1562 1563/* 1564 * Deliver a TGf L2UF frame on behalf of a station. 1565 * This primes any bridge when the station is roaming 1566 * between ap's on the same wired network. 1567 */ 1568static void 1569ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1570{ 1571 struct ieee80211vap *vap = ni->ni_vap; 1572 struct ifnet *ifp = vap->iv_ifp; 1573 struct mbuf *m; 1574 struct l2_update_frame *l2uf; 1575 struct ether_header *eh; 1576 1577 m = m_gethdr(M_NOWAIT, MT_DATA); 1578 if (m == NULL) { 1579 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1580 "%s", "no mbuf for l2uf frame"); 1581 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1582 return; 1583 } 1584 l2uf = mtod(m, struct l2_update_frame *); 1585 eh = &l2uf->eh; 1586 /* dst: Broadcast address */ 1587 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1588 /* src: associated STA */ 1589 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1590 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1591 1592 l2uf->dsap = 0; 1593 l2uf->ssap = 0; 1594 l2uf->control = 0xf5; 1595 l2uf->xid[0] = 0x81; 1596 l2uf->xid[1] = 0x80; 1597 l2uf->xid[2] = 0x00; 1598 1599 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1600 hostap_deliver_data(vap, ni, m); 1601} 1602 1603static void 1604ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1605 int reassoc, int resp, const char *tag, int rate) 1606{ 1607 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1608 "deny %s request, %s rate set mismatch, rate/MCS %d", 1609 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1610 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1611 ieee80211_node_leave(ni); 1612} 1613 1614static void 1615capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1616 int reassoc, int resp, const char *tag, int capinfo) 1617{ 1618 struct ieee80211vap *vap = ni->ni_vap; 1619 1620 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1621 "deny %s request, %s mismatch 0x%x", 1622 reassoc ? "reassoc" : "assoc", tag, capinfo); 1623 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1624 ieee80211_node_leave(ni); 1625 vap->iv_stats.is_rx_assoc_capmismatch++; 1626} 1627 1628static void 1629htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1630 int reassoc, int resp) 1631{ 1632 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1633 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1634 /* XXX no better code */ 1635 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1636 ieee80211_node_leave(ni); 1637} 1638 1639static void 1640authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1641 int algo, int seq, int status) 1642{ 1643 struct ieee80211vap *vap = ni->ni_vap; 1644 1645 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1646 wh, NULL, "unsupported alg %d", algo); 1647 vap->iv_stats.is_rx_auth_unsupported++; 1648 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1649 seq | (status << 16)); 1650} 1651 1652static __inline int 1653ishtmixed(const uint8_t *ie) 1654{ 1655 const struct ieee80211_ie_htinfo *ht = 1656 (const struct ieee80211_ie_htinfo *) ie; 1657 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1658 IEEE80211_HTINFO_OPMODE_MIXED; 1659} 1660 1661static int 1662is11bclient(const uint8_t *rates, const uint8_t *xrates) 1663{ 1664 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1665 int i; 1666 1667 /* NB: the 11b clients we care about will not have xrates */ 1668 if (xrates != NULL || rates == NULL) 1669 return 0; 1670 for (i = 0; i < rates[1]; i++) { 1671 int r = rates[2+i] & IEEE80211_RATE_VAL; 1672 if (r > 2*11 || ((1<<r) & brates) == 0) 1673 return 0; 1674 } 1675 return 1; 1676} 1677 1678static void 1679hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1680 int subtype, int rssi, int nf) 1681{ 1682 struct ieee80211vap *vap = ni->ni_vap; 1683 struct ieee80211com *ic = ni->ni_ic; 1684 struct ieee80211_frame *wh; 1685 uint8_t *frm, *efrm, *sfrm; 1686 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1687 int reassoc, resp; 1688 uint8_t rate; 1689 1690 wh = mtod(m0, struct ieee80211_frame *); 1691 frm = (uint8_t *)&wh[1]; 1692 efrm = mtod(m0, uint8_t *) + m0->m_len; 1693 switch (subtype) { 1694 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1695 case IEEE80211_FC0_SUBTYPE_BEACON: { 1696 struct ieee80211_scanparams scan; 1697 /* 1698 * We process beacon/probe response frames when scanning; 1699 * otherwise we check beacon frames for overlapping non-ERP 1700 * BSS in 11g and/or overlapping legacy BSS when in HT. 1701 */ 1702 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1703 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1704 vap->iv_stats.is_rx_mgtdiscard++; 1705 return; 1706 } 1707 /* NB: accept off-channel frames */ 1708 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1709 return; 1710 /* 1711 * Count frame now that we know it's to be processed. 1712 */ 1713 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1714 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1715 IEEE80211_NODE_STAT(ni, rx_beacons); 1716 } else 1717 IEEE80211_NODE_STAT(ni, rx_proberesp); 1718 /* 1719 * If scanning, just pass information to the scan module. 1720 */ 1721 if (ic->ic_flags & IEEE80211_F_SCAN) { 1722 if (scan.status == 0 && /* NB: on channel */ 1723 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1724 /* 1725 * Actively scanning a channel marked passive; 1726 * send a probe request now that we know there 1727 * is 802.11 traffic present. 1728 * 1729 * XXX check if the beacon we recv'd gives 1730 * us what we need and suppress the probe req 1731 */ 1732 ieee80211_probe_curchan(vap, 1); 1733 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1734 } 1735 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1736 return; 1737 } 1738 /* 1739 * Check beacon for overlapping bss w/ non ERP stations. 1740 * If we detect one and protection is configured but not 1741 * enabled, enable it and start a timer that'll bring us 1742 * out if we stop seeing the bss. 1743 */ 1744 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1745 scan.status == 0 && /* NB: on-channel */ 1746 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1747 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1748 ic->ic_lastnonerp = ticks; 1749 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1750 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1751 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1752 IEEE80211_NOTE_FRAME(vap, 1753 IEEE80211_MSG_ASSOC, wh, 1754 "non-ERP present on channel %d " 1755 "(saw erp 0x%x from channel %d), " 1756 "enable use of protection", 1757 ic->ic_curchan->ic_ieee, 1758 scan.erp, scan.chan); 1759 ic->ic_flags |= IEEE80211_F_USEPROT; 1760 ieee80211_notify_erp(ic); 1761 } 1762 } 1763 /* 1764 * Check beacon for non-HT station on HT channel 1765 * and update HT BSS occupancy as appropriate. 1766 */ 1767 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1768 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1769 /* 1770 * Off control channel; only check frames 1771 * that come in the extension channel when 1772 * operating w/ HT40. 1773 */ 1774 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1775 break; 1776 if (scan.chan != ic->ic_curchan->ic_extieee) 1777 break; 1778 } 1779 if (scan.htinfo == NULL) { 1780 ieee80211_htprot_update(ic, 1781 IEEE80211_HTINFO_OPMODE_PROTOPT | 1782 IEEE80211_HTINFO_NONHT_PRESENT); 1783 } else if (ishtmixed(scan.htinfo)) { 1784 /* XXX? take NONHT_PRESENT from beacon? */ 1785 ieee80211_htprot_update(ic, 1786 IEEE80211_HTINFO_OPMODE_MIXED | 1787 IEEE80211_HTINFO_NONHT_PRESENT); 1788 } 1789 } 1790 break; 1791 } 1792 1793 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1794 if (vap->iv_state != IEEE80211_S_RUN) { 1795 vap->iv_stats.is_rx_mgtdiscard++; 1796 return; 1797 } 1798 /* 1799 * Consult the ACL policy module if setup. 1800 */ 1801 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1802 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1803 wh, NULL, "%s", "disallowed by ACL"); 1804 vap->iv_stats.is_rx_acl++; 1805 return; 1806 } 1807 /* 1808 * prreq frame format 1809 * [tlv] ssid 1810 * [tlv] supported rates 1811 * [tlv] extended supported rates 1812 */ 1813 ssid = rates = xrates = NULL; 1814 sfrm = frm; 1815 while (efrm - frm > 1) { 1816 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1817 switch (*frm) { 1818 case IEEE80211_ELEMID_SSID: 1819 ssid = frm; 1820 break; 1821 case IEEE80211_ELEMID_RATES: 1822 rates = frm; 1823 break; 1824 case IEEE80211_ELEMID_XRATES: 1825 xrates = frm; 1826 break; 1827 } 1828 frm += frm[1] + 2; 1829 } 1830 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1831 if (xrates != NULL) 1832 IEEE80211_VERIFY_ELEMENT(xrates, 1833 IEEE80211_RATE_MAXSIZE - rates[1], return); 1834 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1835 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1836 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1837 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1838 wh, NULL, 1839 "%s", "no ssid with ssid suppression enabled"); 1840 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1841 return; 1842 } 1843 1844 /* XXX find a better class or define it's own */ 1845 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1846 "%s", "recv probe req"); 1847 /* 1848 * Some legacy 11b clients cannot hack a complete 1849 * probe response frame. When the request includes 1850 * only a bare-bones rate set, communicate this to 1851 * the transmit side. 1852 */ 1853 ieee80211_send_proberesp(vap, wh->i_addr2, 1854 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1855 break; 1856 1857 case IEEE80211_FC0_SUBTYPE_AUTH: { 1858 uint16_t algo, seq, status; 1859 1860 if (vap->iv_state != IEEE80211_S_RUN) { 1861 vap->iv_stats.is_rx_mgtdiscard++; 1862 return; 1863 } 1864 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1865 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1866 wh, NULL, "%s", "wrong bssid"); 1867 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1868 return; 1869 } 1870 /* 1871 * auth frame format 1872 * [2] algorithm 1873 * [2] sequence 1874 * [2] status 1875 * [tlv*] challenge 1876 */ 1877 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1878 algo = le16toh(*(uint16_t *)frm); 1879 seq = le16toh(*(uint16_t *)(frm + 2)); 1880 status = le16toh(*(uint16_t *)(frm + 4)); 1881 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1882 "recv auth frame with algorithm %d seq %d", algo, seq); 1883 /* 1884 * Consult the ACL policy module if setup. 1885 */ 1886 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) { 1887 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1888 wh, NULL, "%s", "disallowed by ACL"); 1889 vap->iv_stats.is_rx_acl++; 1890 ieee80211_send_error(ni, wh->i_addr2, 1891 IEEE80211_FC0_SUBTYPE_AUTH, 1892 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1893 return; 1894 } 1895 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1896 IEEE80211_DISCARD(vap, 1897 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1898 wh, NULL, "%s", "TKIP countermeasures enabled"); 1899 vap->iv_stats.is_rx_auth_countermeasures++; 1900 ieee80211_send_error(ni, wh->i_addr2, 1901 IEEE80211_FC0_SUBTYPE_AUTH, 1902 IEEE80211_REASON_MIC_FAILURE); 1903 return; 1904 } 1905 if (algo == IEEE80211_AUTH_ALG_SHARED) 1906 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1907 seq, status); 1908 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1909 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1910 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1911 authalgreject(ni, wh, algo, 1912 seq+1, IEEE80211_STATUS_ALG); 1913 return; 1914 } else { 1915 /* 1916 * We assume that an unknown algorithm is the result 1917 * of a decryption failure on a shared key auth frame; 1918 * return a status code appropriate for that instead 1919 * of IEEE80211_STATUS_ALG. 1920 * 1921 * NB: a seq# of 4 is intentional; the decrypted 1922 * frame likely has a bogus seq value. 1923 */ 1924 authalgreject(ni, wh, algo, 1925 4, IEEE80211_STATUS_CHALLENGE); 1926 return; 1927 } 1928 break; 1929 } 1930 1931 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1932 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1933 uint16_t capinfo, lintval; 1934 struct ieee80211_rsnparms rsnparms; 1935 1936 if (vap->iv_state != IEEE80211_S_RUN) { 1937 vap->iv_stats.is_rx_mgtdiscard++; 1938 return; 1939 } 1940 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1941 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1942 wh, NULL, "%s", "wrong bssid"); 1943 vap->iv_stats.is_rx_assoc_bss++; 1944 return; 1945 } 1946 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1947 reassoc = 1; 1948 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1949 } else { 1950 reassoc = 0; 1951 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1952 } 1953 if (ni == vap->iv_bss) { 1954 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1955 "deny %s request, sta not authenticated", 1956 reassoc ? "reassoc" : "assoc"); 1957 ieee80211_send_error(ni, wh->i_addr2, 1958 IEEE80211_FC0_SUBTYPE_DEAUTH, 1959 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1960 vap->iv_stats.is_rx_assoc_notauth++; 1961 return; 1962 } 1963 1964 /* 1965 * asreq frame format 1966 * [2] capability information 1967 * [2] listen interval 1968 * [6*] current AP address (reassoc only) 1969 * [tlv] ssid 1970 * [tlv] supported rates 1971 * [tlv] extended supported rates 1972 * [tlv] WPA or RSN 1973 * [tlv] HT capabilities 1974 * [tlv] Atheros capabilities 1975 */ 1976 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1977 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1978 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1979 if (reassoc) 1980 frm += 6; /* ignore current AP info */ 1981 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1982 sfrm = frm; 1983 while (efrm - frm > 1) { 1984 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1985 switch (*frm) { 1986 case IEEE80211_ELEMID_SSID: 1987 ssid = frm; 1988 break; 1989 case IEEE80211_ELEMID_RATES: 1990 rates = frm; 1991 break; 1992 case IEEE80211_ELEMID_XRATES: 1993 xrates = frm; 1994 break; 1995 case IEEE80211_ELEMID_RSN: 1996 rsn = frm; 1997 break; 1998 case IEEE80211_ELEMID_HTCAP: 1999 htcap = frm; 2000 break; 2001 case IEEE80211_ELEMID_VENDOR: 2002 if (iswpaoui(frm)) 2003 wpa = frm; 2004 else if (iswmeinfo(frm)) 2005 wme = frm; 2006#ifdef IEEE80211_SUPPORT_SUPERG 2007 else if (isatherosoui(frm)) 2008 ath = frm; 2009#endif 2010 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2011 if (ishtcapoui(frm) && htcap == NULL) 2012 htcap = frm; 2013 } 2014 break; 2015 } 2016 frm += frm[1] + 2; 2017 } 2018 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2019 if (xrates != NULL) 2020 IEEE80211_VERIFY_ELEMENT(xrates, 2021 IEEE80211_RATE_MAXSIZE - rates[1], return); 2022 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2023 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2024 if (htcap != NULL) { 2025 IEEE80211_VERIFY_LENGTH(htcap[1], 2026 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2027 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2028 sizeof(struct ieee80211_ie_htcap)-2, 2029 return); /* XXX just NULL out? */ 2030 } 2031 2032 if ((vap->iv_flags & IEEE80211_F_WPA) && 2033 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2034 return; 2035 /* discard challenge after association */ 2036 if (ni->ni_challenge != NULL) { 2037 free(ni->ni_challenge, M_80211_NODE); 2038 ni->ni_challenge = NULL; 2039 } 2040 /* NB: 802.11 spec says to ignore station's privacy bit */ 2041 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2042 capinfomismatch(ni, wh, reassoc, resp, 2043 "capability", capinfo); 2044 return; 2045 } 2046 /* 2047 * Disallow re-associate w/ invalid slot time setting. 2048 */ 2049 if (ni->ni_associd != 0 && 2050 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2051 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2052 capinfomismatch(ni, wh, reassoc, resp, 2053 "slot time", capinfo); 2054 return; 2055 } 2056 rate = ieee80211_setup_rates(ni, rates, xrates, 2057 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2058 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2059 if (rate & IEEE80211_RATE_BASIC) { 2060 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2061 vap->iv_stats.is_rx_assoc_norate++; 2062 return; 2063 } 2064 /* 2065 * If constrained to 11g-only stations reject an 2066 * 11b-only station. We cheat a bit here by looking 2067 * at the max negotiated xmit rate and assuming anyone 2068 * with a best rate <24Mb/s is an 11b station. 2069 */ 2070 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2071 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2072 vap->iv_stats.is_rx_assoc_norate++; 2073 return; 2074 } 2075 /* 2076 * Do HT rate set handling and setup HT node state. 2077 */ 2078 ni->ni_chan = vap->iv_bss->ni_chan; 2079 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2080 rate = ieee80211_setup_htrates(ni, htcap, 2081 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2082 IEEE80211_F_DOBRS); 2083 if (rate & IEEE80211_RATE_BASIC) { 2084 ratesetmismatch(ni, wh, reassoc, resp, 2085 "HT", rate); 2086 vap->iv_stats.is_ht_assoc_norate++; 2087 return; 2088 } 2089 ieee80211_ht_node_init(ni); 2090 ieee80211_ht_updatehtcap(ni, htcap); 2091 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2092 ieee80211_ht_node_cleanup(ni); 2093#ifdef IEEE80211_SUPPORT_SUPERG 2094 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2095 ieee80211_ff_node_cleanup(ni); 2096#endif 2097 /* 2098 * Allow AMPDU operation only with unencrypted traffic 2099 * or AES-CCM; the 11n spec only specifies these ciphers 2100 * so permitting any others is undefined and can lead 2101 * to interoperability problems. 2102 */ 2103 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2104 (((vap->iv_flags & IEEE80211_F_WPA) && 2105 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2106 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2107 IEEE80211_NOTE(vap, 2108 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2109 "disallow HT use because WEP or TKIP requested, " 2110 "capinfo 0x%x ucastcipher %d", capinfo, 2111 rsnparms.rsn_ucastcipher); 2112 ieee80211_ht_node_cleanup(ni); 2113 vap->iv_stats.is_ht_assoc_downgrade++; 2114 } 2115 /* 2116 * If constrained to 11n-only stations reject legacy stations. 2117 */ 2118 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2119 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2120 htcapmismatch(ni, wh, reassoc, resp); 2121 vap->iv_stats.is_ht_assoc_nohtcap++; 2122 return; 2123 } 2124 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2125 ni->ni_noise = nf; 2126 ni->ni_intval = lintval; 2127 ni->ni_capinfo = capinfo; 2128 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2129 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2130 /* 2131 * Store the IEs. 2132 * XXX maybe better to just expand 2133 */ 2134 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2135#define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2136 if (wpa != NULL) 2137 setie(wpa_ie, wpa - sfrm); 2138 if (rsn != NULL) 2139 setie(rsn_ie, rsn - sfrm); 2140 if (htcap != NULL) 2141 setie(htcap_ie, htcap - sfrm); 2142 if (wme != NULL) { 2143 setie(wme_ie, wme - sfrm); 2144 /* 2145 * Mark node as capable of QoS. 2146 */ 2147 ni->ni_flags |= IEEE80211_NODE_QOS; 2148 } else 2149 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2150#ifdef IEEE80211_SUPPORT_SUPERG 2151 if (ath != NULL) { 2152 setie(ath_ie, ath - sfrm); 2153 /* 2154 * Parse ATH station parameters. 2155 */ 2156 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2157 } else 2158#endif 2159 ni->ni_ath_flags = 0; 2160#undef setie 2161 } else { 2162 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2163 ni->ni_ath_flags = 0; 2164 } 2165 ieee80211_node_join(ni, resp); 2166 ieee80211_deliver_l2uf(ni); 2167 break; 2168 } 2169 2170 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2171 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2172 uint16_t reason; 2173 2174 if (vap->iv_state != IEEE80211_S_RUN || 2175 /* NB: can happen when in promiscuous mode */ 2176 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2177 vap->iv_stats.is_rx_mgtdiscard++; 2178 break; 2179 } 2180 /* 2181 * deauth/disassoc frame format 2182 * [2] reason 2183 */ 2184 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2185 reason = le16toh(*(uint16_t *)frm); 2186 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2187 vap->iv_stats.is_rx_deauth++; 2188 IEEE80211_NODE_STAT(ni, rx_deauth); 2189 } else { 2190 vap->iv_stats.is_rx_disassoc++; 2191 IEEE80211_NODE_STAT(ni, rx_disassoc); 2192 } 2193 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2194 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2195 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2196 if (ni != vap->iv_bss) 2197 ieee80211_node_leave(ni); 2198 break; 2199 } 2200 2201 case IEEE80211_FC0_SUBTYPE_ACTION: 2202 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2203 if (ni == vap->iv_bss) { 2204 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2205 wh, NULL, "%s", "unknown node"); 2206 vap->iv_stats.is_rx_mgtdiscard++; 2207 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2208 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2209 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2210 wh, NULL, "%s", "not for us"); 2211 vap->iv_stats.is_rx_mgtdiscard++; 2212 } else if (vap->iv_state != IEEE80211_S_RUN) { 2213 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2214 wh, NULL, "wrong state %s", 2215 ieee80211_state_name[vap->iv_state]); 2216 vap->iv_stats.is_rx_mgtdiscard++; 2217 } else { 2218 if (ieee80211_parse_action(ni, m0) == 0) 2219 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2220 } 2221 break; 2222 2223 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2224 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2225 case IEEE80211_FC0_SUBTYPE_ATIM: 2226 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2227 wh, NULL, "%s", "not handled"); 2228 vap->iv_stats.is_rx_mgtdiscard++; 2229 break; 2230 2231 default: 2232 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2233 wh, "mgt", "subtype 0x%x not handled", subtype); 2234 vap->iv_stats.is_rx_badsubtype++; 2235 break; 2236 } 2237} 2238 2239static void 2240hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2241{ 2242 switch (subtype) { 2243 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2244 ni->ni_vap->iv_recv_pspoll(ni, m); 2245 break; 2246 case IEEE80211_FC0_SUBTYPE_BAR: 2247 ieee80211_recv_bar(ni, m); 2248 break; 2249 } 2250} 2251 2252/* 2253 * Process a received ps-poll frame. 2254 */ 2255void 2256ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2257{ 2258 struct ieee80211vap *vap = ni->ni_vap; 2259 struct ieee80211com *ic = vap->iv_ic; 2260 struct ieee80211_frame_min *wh; 2261 struct mbuf *m; 2262 uint16_t aid; 2263 int qlen; 2264 2265 wh = mtod(m0, struct ieee80211_frame_min *); 2266 if (ni->ni_associd == 0) { 2267 IEEE80211_DISCARD(vap, 2268 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2269 (struct ieee80211_frame *) wh, NULL, 2270 "%s", "unassociated station"); 2271 vap->iv_stats.is_ps_unassoc++; 2272 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2273 IEEE80211_REASON_NOT_ASSOCED); 2274 return; 2275 } 2276 2277 aid = le16toh(*(uint16_t *)wh->i_dur); 2278 if (aid != ni->ni_associd) { 2279 IEEE80211_DISCARD(vap, 2280 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2281 (struct ieee80211_frame *) wh, NULL, 2282 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2283 ni->ni_associd, aid); 2284 vap->iv_stats.is_ps_badaid++; 2285 /* 2286 * NB: We used to deauth the station but it turns out 2287 * the Blackberry Curve 8230 (and perhaps other devices) 2288 * sometimes send the wrong AID when WME is negotiated. 2289 * Being more lenient here seems ok as we already check 2290 * the station is associated and we only return frames 2291 * queued for the station (i.e. we don't use the AID). 2292 */ 2293 return; 2294 } 2295 2296 /* Okay, take the first queued packet and put it out... */ 2297 m = ieee80211_node_psq_dequeue(ni, &qlen); 2298 if (m == NULL) { 2299 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2300 "%s", "recv ps-poll, but queue empty"); 2301 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2302 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2303 if (vap->iv_set_tim != NULL) 2304 vap->iv_set_tim(ni, 0); /* just in case */ 2305 return; 2306 } 2307 /* 2308 * If there are more packets, set the more packets bit 2309 * in the packet dispatched to the station; otherwise 2310 * turn off the TIM bit. 2311 */ 2312 if (qlen != 0) { 2313 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2314 "recv ps-poll, send packet, %u still queued", qlen); 2315 m->m_flags |= M_MORE_DATA; 2316 } else { 2317 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2318 "%s", "recv ps-poll, send packet, queue empty"); 2319 if (vap->iv_set_tim != NULL) 2320 vap->iv_set_tim(ni, 0); 2321 } 2322 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2323 2324 /* 2325 * Do the right thing; if it's an encap'ed frame then 2326 * call ieee80211_parent_xmitpkt() (and free the ref) else 2327 * call ieee80211_vap_xmitpkt(). 2328 */ 2329 if (m->m_flags & M_ENCAP) { 2330 if (ieee80211_parent_xmitpkt(ic, m) != 0) 2331 ieee80211_free_node(ni); 2332 } else { 2333 (void) ieee80211_vap_xmitpkt(vap, m); 2334 } 2335} 2336