ieee80211_hostap.c revision 218958
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 218958 2011-02-22 19:05:42Z bschmidt $"); 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_media.h> 52#include <net/if_llc.h> 53#include <net/ethernet.h> 54 55#include <net/bpf.h> 56 57#include <net80211/ieee80211_var.h> 58#include <net80211/ieee80211_hostap.h> 59#include <net80211/ieee80211_input.h> 60#ifdef IEEE80211_SUPPORT_SUPERG 61#include <net80211/ieee80211_superg.h> 62#endif 63#include <net80211/ieee80211_wds.h> 64 65#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 66 67static void hostap_vattach(struct ieee80211vap *); 68static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 70 int rssi, int nf); 71static void hostap_deliver_data(struct ieee80211vap *, 72 struct ieee80211_node *, struct mbuf *); 73static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int nf); 75static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 76static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *); 77 78void 79ieee80211_hostap_attach(struct ieee80211com *ic) 80{ 81 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 82} 83 84void 85ieee80211_hostap_detach(struct ieee80211com *ic) 86{ 87} 88 89static void 90hostap_vdetach(struct ieee80211vap *vap) 91{ 92} 93 94static void 95hostap_vattach(struct ieee80211vap *vap) 96{ 97 vap->iv_newstate = hostap_newstate; 98 vap->iv_input = hostap_input; 99 vap->iv_recv_mgmt = hostap_recv_mgmt; 100 vap->iv_recv_ctl = hostap_recv_ctl; 101 vap->iv_opdetach = hostap_vdetach; 102 vap->iv_deliver_data = hostap_deliver_data; 103} 104 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_80211_RX | M_MCAST | M_BCAST); 359 360 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 361 ("gack, opmode %d", vap->iv_opmode)); 362 /* 363 * Do accounting. 364 */ 365 ifp->if_ipackets++; 366 IEEE80211_NODE_STAT(ni, rx_data); 367 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 368 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 369 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 370 IEEE80211_NODE_STAT(ni, rx_mcast); 371 } else 372 IEEE80211_NODE_STAT(ni, rx_ucast); 373 374 /* perform as a bridge within the AP */ 375 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 376 struct mbuf *mcopy = NULL; 377 378 if (m->m_flags & M_MCAST) { 379 mcopy = m_dup(m, M_DONTWAIT); 380 if (mcopy == NULL) 381 ifp->if_oerrors++; 382 else 383 mcopy->m_flags |= M_MCAST; 384 } else { 385 /* 386 * Check if the destination is associated with the 387 * same vap and authorized to receive traffic. 388 * Beware of traffic destined for the vap itself; 389 * sending it will not work; just let it be delivered 390 * normally. 391 */ 392 struct ieee80211_node *sta = ieee80211_find_vap_node( 393 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 394 if (sta != NULL) { 395 if (ieee80211_node_is_authorized(sta)) { 396 /* 397 * Beware of sending to ourself; this 398 * needs to happen via the normal 399 * input path. 400 */ 401 if (sta != vap->iv_bss) { 402 mcopy = m; 403 m = NULL; 404 } 405 } else { 406 vap->iv_stats.is_rx_unauth++; 407 IEEE80211_NODE_STAT(sta, rx_unauth); 408 } 409 ieee80211_free_node(sta); 410 } 411 } 412 if (mcopy != NULL) { 413 int len, err; 414 len = mcopy->m_pkthdr.len; 415 err = ifp->if_transmit(ifp, mcopy); 416 if (err) { 417 /* NB: IFQ_HANDOFF reclaims mcopy */ 418 } else { 419 ifp->if_opackets++; 420 } 421 } 422 } 423 if (m != NULL) { 424 /* 425 * Mark frame as coming from vap's interface. 426 */ 427 m->m_pkthdr.rcvif = ifp; 428 if (m->m_flags & M_MCAST) { 429 /* 430 * Spam DWDS vap's w/ multicast traffic. 431 */ 432 /* XXX only if dwds in use? */ 433 ieee80211_dwds_mcast(vap, m); 434 } 435 if (ni->ni_vlan != 0) { 436 /* attach vlan tag */ 437 m->m_pkthdr.ether_vtag = ni->ni_vlan; 438 m->m_flags |= M_VLANTAG; 439 } 440 ifp->if_input(ifp, m); 441 } 442} 443 444/* 445 * Decide if a received management frame should be 446 * printed when debugging is enabled. This filters some 447 * of the less interesting frames that come frequently 448 * (e.g. beacons). 449 */ 450static __inline int 451doprint(struct ieee80211vap *vap, int subtype) 452{ 453 switch (subtype) { 454 case IEEE80211_FC0_SUBTYPE_BEACON: 455 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 456 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 457 return 0; 458 } 459 return 1; 460} 461 462/* 463 * Process a received frame. The node associated with the sender 464 * should be supplied. If nothing was found in the node table then 465 * the caller is assumed to supply a reference to iv_bss instead. 466 * The RSSI and a timestamp are also supplied. The RSSI data is used 467 * during AP scanning to select a AP to associate with; it can have 468 * any units so long as values have consistent units and higher values 469 * mean ``better signal''. The receive timestamp is currently not used 470 * by the 802.11 layer. 471 */ 472static int 473hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 474{ 475#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 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 ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 576 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 577 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 578 /* duplicate, discard */ 579 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 580 bssid, "duplicate", 581 "seqno <%u,%u> fragno <%u,%u> tid %u", 582 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 583 ni->ni_rxseqs[tid] >> 584 IEEE80211_SEQ_SEQ_SHIFT, 585 rxseq & IEEE80211_SEQ_FRAG_MASK, 586 ni->ni_rxseqs[tid] & 587 IEEE80211_SEQ_FRAG_MASK, 588 tid); 589 vap->iv_stats.is_rx_dup++; 590 IEEE80211_NODE_STAT(ni, rx_dup); 591 goto out; 592 } 593 ni->ni_rxseqs[tid] = rxseq; 594 } 595 } 596 597 switch (type) { 598 case IEEE80211_FC0_TYPE_DATA: 599 hdrspace = ieee80211_hdrspace(ic, wh); 600 if (m->m_len < hdrspace && 601 (m = m_pullup(m, hdrspace)) == NULL) { 602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 603 ni->ni_macaddr, NULL, 604 "data too short: expecting %u", hdrspace); 605 vap->iv_stats.is_rx_tooshort++; 606 goto out; /* XXX */ 607 } 608 if (!(dir == IEEE80211_FC1_DIR_TODS || 609 (dir == IEEE80211_FC1_DIR_DSTODS && 610 (vap->iv_flags & IEEE80211_F_DWDS)))) { 611 if (dir != IEEE80211_FC1_DIR_DSTODS) { 612 IEEE80211_DISCARD(vap, 613 IEEE80211_MSG_INPUT, wh, "data", 614 "incorrect dir 0x%x", dir); 615 } else { 616 IEEE80211_DISCARD(vap, 617 IEEE80211_MSG_INPUT | 618 IEEE80211_MSG_WDS, wh, 619 "4-address data", 620 "%s", "DWDS not enabled"); 621 } 622 vap->iv_stats.is_rx_wrongdir++; 623 goto out; 624 } 625 /* check if source STA is associated */ 626 if (ni == vap->iv_bss) { 627 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 628 wh, "data", "%s", "unknown src"); 629 ieee80211_send_error(ni, wh->i_addr2, 630 IEEE80211_FC0_SUBTYPE_DEAUTH, 631 IEEE80211_REASON_NOT_AUTHED); 632 vap->iv_stats.is_rx_notassoc++; 633 goto err; 634 } 635 if (ni->ni_associd == 0) { 636 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 637 wh, "data", "%s", "unassoc src"); 638 IEEE80211_SEND_MGMT(ni, 639 IEEE80211_FC0_SUBTYPE_DISASSOC, 640 IEEE80211_REASON_NOT_ASSOCED); 641 vap->iv_stats.is_rx_notassoc++; 642 goto err; 643 } 644 645 /* 646 * Check for power save state change. 647 * XXX out-of-order A-MPDU frames? 648 */ 649 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 650 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 651 ieee80211_node_pwrsave(ni, 652 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 653 /* 654 * For 4-address packets handle WDS discovery 655 * notifications. Once a WDS link is setup frames 656 * are just delivered to the WDS vap (see below). 657 */ 658 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 659 if (!ieee80211_node_is_authorized(ni)) { 660 IEEE80211_DISCARD(vap, 661 IEEE80211_MSG_INPUT | 662 IEEE80211_MSG_WDS, wh, 663 "4-address data", 664 "%s", "unauthorized port"); 665 vap->iv_stats.is_rx_unauth++; 666 IEEE80211_NODE_STAT(ni, rx_unauth); 667 goto err; 668 } 669 ieee80211_dwds_discover(ni, m); 670 return type; 671 } 672 673 /* 674 * Handle A-MPDU re-ordering. If the frame is to be 675 * processed directly then ieee80211_ampdu_reorder 676 * will return 0; otherwise it has consumed the mbuf 677 * and we should do nothing more with it. 678 */ 679 if ((m->m_flags & M_AMPDU) && 680 ieee80211_ampdu_reorder(ni, m) != 0) { 681 m = NULL; 682 goto out; 683 } 684 resubmit_ampdu: 685 686 /* 687 * Handle privacy requirements. Note that we 688 * must not be preempted from here until after 689 * we (potentially) call ieee80211_crypto_demic; 690 * otherwise we may violate assumptions in the 691 * crypto cipher modules used to do delayed update 692 * of replay sequence numbers. 693 */ 694 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 695 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 696 /* 697 * Discard encrypted frames when privacy is off. 698 */ 699 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 700 wh, "WEP", "%s", "PRIVACY off"); 701 vap->iv_stats.is_rx_noprivacy++; 702 IEEE80211_NODE_STAT(ni, rx_noprivacy); 703 goto out; 704 } 705 key = ieee80211_crypto_decap(ni, m, hdrspace); 706 if (key == NULL) { 707 /* NB: stats+msgs handled in crypto_decap */ 708 IEEE80211_NODE_STAT(ni, rx_wepfail); 709 goto out; 710 } 711 wh = mtod(m, struct ieee80211_frame *); 712 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 713 } else { 714 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 715 key = NULL; 716 } 717 718 /* 719 * Save QoS bits for use below--before we strip the header. 720 */ 721 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 722 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 723 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 724 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 725 } else 726 qos = 0; 727 728 /* 729 * Next up, any fragmentation. 730 */ 731 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 732 m = ieee80211_defrag(ni, m, hdrspace); 733 if (m == NULL) { 734 /* Fragment dropped or frame not complete yet */ 735 goto out; 736 } 737 } 738 wh = NULL; /* no longer valid, catch any uses */ 739 740 /* 741 * Next strip any MSDU crypto bits. 742 */ 743 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 744 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 745 ni->ni_macaddr, "data", "%s", "demic error"); 746 vap->iv_stats.is_rx_demicfail++; 747 IEEE80211_NODE_STAT(ni, rx_demicfail); 748 goto out; 749 } 750 /* copy to listener after decrypt */ 751 if (ieee80211_radiotap_active_vap(vap)) 752 ieee80211_radiotap_rx(vap, m); 753 need_tap = 0; 754 /* 755 * Finally, strip the 802.11 header. 756 */ 757 m = ieee80211_decap(vap, m, hdrspace); 758 if (m == NULL) { 759 /* XXX mask bit to check for both */ 760 /* don't count Null data frames as errors */ 761 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 762 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 763 goto out; 764 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 765 ni->ni_macaddr, "data", "%s", "decap error"); 766 vap->iv_stats.is_rx_decap++; 767 IEEE80211_NODE_STAT(ni, rx_decap); 768 goto err; 769 } 770 eh = mtod(m, struct ether_header *); 771 if (!ieee80211_node_is_authorized(ni)) { 772 /* 773 * Deny any non-PAE frames received prior to 774 * authorization. For open/shared-key 775 * authentication the port is mark authorized 776 * after authentication completes. For 802.1x 777 * the port is not marked authorized by the 778 * authenticator until the handshake has completed. 779 */ 780 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 781 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 782 eh->ether_shost, "data", 783 "unauthorized port: ether type 0x%x len %u", 784 eh->ether_type, m->m_pkthdr.len); 785 vap->iv_stats.is_rx_unauth++; 786 IEEE80211_NODE_STAT(ni, rx_unauth); 787 goto err; 788 } 789 } else { 790 /* 791 * When denying unencrypted frames, discard 792 * any non-PAE frames received without encryption. 793 */ 794 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 795 (key == NULL && (m->m_flags & M_WEP) == 0) && 796 eh->ether_type != htons(ETHERTYPE_PAE)) { 797 /* 798 * Drop unencrypted frames. 799 */ 800 vap->iv_stats.is_rx_unencrypted++; 801 IEEE80211_NODE_STAT(ni, rx_unencrypted); 802 goto out; 803 } 804 } 805 /* XXX require HT? */ 806 if (qos & IEEE80211_QOS_AMSDU) { 807 m = ieee80211_decap_amsdu(ni, m); 808 if (m == NULL) 809 return IEEE80211_FC0_TYPE_DATA; 810 } else { 811#ifdef IEEE80211_SUPPORT_SUPERG 812 m = ieee80211_decap_fastframe(vap, ni, m); 813 if (m == NULL) 814 return IEEE80211_FC0_TYPE_DATA; 815#endif 816 } 817 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 818 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 819 else 820 hostap_deliver_data(vap, ni, m); 821 return IEEE80211_FC0_TYPE_DATA; 822 823 case IEEE80211_FC0_TYPE_MGT: 824 vap->iv_stats.is_rx_mgmt++; 825 IEEE80211_NODE_STAT(ni, rx_mgmt); 826 if (dir != IEEE80211_FC1_DIR_NODS) { 827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 828 wh, "mgt", "incorrect dir 0x%x", dir); 829 vap->iv_stats.is_rx_wrongdir++; 830 goto err; 831 } 832 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 833 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 834 ni->ni_macaddr, "mgt", "too short: len %u", 835 m->m_pkthdr.len); 836 vap->iv_stats.is_rx_tooshort++; 837 goto out; 838 } 839 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 840 /* ensure return frames are unicast */ 841 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 842 wh, NULL, "source is multicast: %s", 843 ether_sprintf(wh->i_addr2)); 844 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 845 goto out; 846 } 847#ifdef IEEE80211_DEBUG 848 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 849 ieee80211_msg_dumppkts(vap)) { 850 if_printf(ifp, "received %s from %s rssi %d\n", 851 ieee80211_mgt_subtype_name[subtype >> 852 IEEE80211_FC0_SUBTYPE_SHIFT], 853 ether_sprintf(wh->i_addr2), rssi); 854 } 855#endif 856 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 857 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 858 /* 859 * Only shared key auth frames with a challenge 860 * should be encrypted, discard all others. 861 */ 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, NULL, 864 "%s", "WEP set but not permitted"); 865 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 866 goto out; 867 } 868 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 869 /* 870 * Discard encrypted frames when privacy is off. 871 */ 872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 873 wh, NULL, "%s", "WEP set but PRIVACY off"); 874 vap->iv_stats.is_rx_noprivacy++; 875 goto out; 876 } 877 hdrspace = ieee80211_hdrspace(ic, wh); 878 key = ieee80211_crypto_decap(ni, m, hdrspace); 879 if (key == NULL) { 880 /* NB: stats+msgs handled in crypto_decap */ 881 goto out; 882 } 883 wh = mtod(m, struct ieee80211_frame *); 884 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 885 } 886 /* 887 * Pass the packet to radiotap before calling iv_recv_mgmt(). 888 * Otherwise iv_recv_mgmt() might pass another packet to 889 * radiotap, resulting in out of order packet captures. 890 */ 891 if (ieee80211_radiotap_active_vap(vap)) 892 ieee80211_radiotap_rx(vap, m); 893 need_tap = 0; 894 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 895 goto out; 896 897 case IEEE80211_FC0_TYPE_CTL: 898 vap->iv_stats.is_rx_ctl++; 899 IEEE80211_NODE_STAT(ni, rx_ctrl); 900 vap->iv_recv_ctl(ni, m, subtype); 901 goto out; 902 default: 903 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 904 wh, "bad", "frame type 0x%x", type); 905 /* should not come here */ 906 break; 907 } 908err: 909 ifp->if_ierrors++; 910out: 911 if (m != NULL) { 912 if (need_tap && ieee80211_radiotap_active_vap(vap)) 913 ieee80211_radiotap_rx(vap, m); 914 m_freem(m); 915 } 916 return type; 917#undef SEQ_LEQ 918} 919 920static void 921hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 922 int rssi, int nf, uint16_t seq, uint16_t status) 923{ 924 struct ieee80211vap *vap = ni->ni_vap; 925 926 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 927 928 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 929 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 930 ni->ni_macaddr, "open auth", 931 "bad sta auth mode %u", ni->ni_authmode); 932 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 933 /* 934 * Clear any challenge text that may be there if 935 * a previous shared key auth failed and then an 936 * open auth is attempted. 937 */ 938 if (ni->ni_challenge != NULL) { 939 free(ni->ni_challenge, M_80211_NODE); 940 ni->ni_challenge = NULL; 941 } 942 /* XXX hack to workaround calling convention */ 943 ieee80211_send_error(ni, wh->i_addr2, 944 IEEE80211_FC0_SUBTYPE_AUTH, 945 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 946 return; 947 } 948 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 949 vap->iv_stats.is_rx_bad_auth++; 950 return; 951 } 952 /* always accept open authentication requests */ 953 if (ni == vap->iv_bss) { 954 ni = ieee80211_dup_bss(vap, wh->i_addr2); 955 if (ni == NULL) 956 return; 957 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 958 (void) ieee80211_ref_node(ni); 959 /* 960 * Mark the node as referenced to reflect that it's 961 * reference count has been bumped to insure it remains 962 * after the transaction completes. 963 */ 964 ni->ni_flags |= IEEE80211_NODE_AREF; 965 /* 966 * Mark the node as requiring a valid association id 967 * before outbound traffic is permitted. 968 */ 969 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 970 971 if (vap->iv_acl != NULL && 972 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 973 /* 974 * When the ACL policy is set to RADIUS we defer the 975 * authorization to a user agent. Dispatch an event, 976 * a subsequent MLME call will decide the fate of the 977 * station. If the user agent is not present then the 978 * node will be reclaimed due to inactivity. 979 */ 980 IEEE80211_NOTE_MAC(vap, 981 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 982 "%s", "station authentication defered (radius acl)"); 983 ieee80211_notify_node_auth(ni); 984 } else { 985 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 986 IEEE80211_NOTE_MAC(vap, 987 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 988 "%s", "station authenticated (open)"); 989 /* 990 * When 802.1x is not in use mark the port 991 * authorized at this point so traffic can flow. 992 */ 993 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 994 ieee80211_node_authorize(ni); 995 } 996} 997 998static void 999hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 1000 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 1001 uint16_t seq, uint16_t status) 1002{ 1003 struct ieee80211vap *vap = ni->ni_vap; 1004 uint8_t *challenge; 1005 int allocbs, estatus; 1006 1007 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 1008 1009 /* 1010 * NB: this can happen as we allow pre-shared key 1011 * authentication to be enabled w/o wep being turned 1012 * on so that configuration of these can be done 1013 * in any order. It may be better to enforce the 1014 * ordering in which case this check would just be 1015 * for sanity/consistency. 1016 */ 1017 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 1018 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1019 ni->ni_macaddr, "shared key auth", 1020 "%s", " PRIVACY is disabled"); 1021 estatus = IEEE80211_STATUS_ALG; 1022 goto bad; 1023 } 1024 /* 1025 * Pre-shared key authentication is evil; accept 1026 * it only if explicitly configured (it is supported 1027 * mainly for compatibility with clients like Mac OS X). 1028 */ 1029 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 1030 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 1031 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1032 ni->ni_macaddr, "shared key auth", 1033 "bad sta auth mode %u", ni->ni_authmode); 1034 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 1035 estatus = IEEE80211_STATUS_ALG; 1036 goto bad; 1037 } 1038 1039 challenge = NULL; 1040 if (frm + 1 < efrm) { 1041 if ((frm[1] + 2) > (efrm - frm)) { 1042 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1043 ni->ni_macaddr, "shared key auth", 1044 "ie %d/%d too long", 1045 frm[0], (frm[1] + 2) - (efrm - frm)); 1046 vap->iv_stats.is_rx_bad_auth++; 1047 estatus = IEEE80211_STATUS_CHALLENGE; 1048 goto bad; 1049 } 1050 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1051 challenge = frm; 1052 frm += frm[1] + 2; 1053 } 1054 switch (seq) { 1055 case IEEE80211_AUTH_SHARED_CHALLENGE: 1056 case IEEE80211_AUTH_SHARED_RESPONSE: 1057 if (challenge == NULL) { 1058 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1059 ni->ni_macaddr, "shared key auth", 1060 "%s", "no challenge"); 1061 vap->iv_stats.is_rx_bad_auth++; 1062 estatus = IEEE80211_STATUS_CHALLENGE; 1063 goto bad; 1064 } 1065 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1066 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1067 ni->ni_macaddr, "shared key auth", 1068 "bad challenge len %d", challenge[1]); 1069 vap->iv_stats.is_rx_bad_auth++; 1070 estatus = IEEE80211_STATUS_CHALLENGE; 1071 goto bad; 1072 } 1073 default: 1074 break; 1075 } 1076 switch (seq) { 1077 case IEEE80211_AUTH_SHARED_REQUEST: 1078 if (ni == vap->iv_bss) { 1079 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1080 if (ni == NULL) { 1081 /* NB: no way to return an error */ 1082 return; 1083 } 1084 allocbs = 1; 1085 } else { 1086 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1087 (void) ieee80211_ref_node(ni); 1088 allocbs = 0; 1089 } 1090 /* 1091 * Mark the node as referenced to reflect that it's 1092 * reference count has been bumped to insure it remains 1093 * after the transaction completes. 1094 */ 1095 ni->ni_flags |= IEEE80211_NODE_AREF; 1096 /* 1097 * Mark the node as requiring a valid associatio id 1098 * before outbound traffic is permitted. 1099 */ 1100 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1101 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1102 ni->ni_noise = nf; 1103 if (!ieee80211_alloc_challenge(ni)) { 1104 /* NB: don't return error so they rexmit */ 1105 return; 1106 } 1107 get_random_bytes(ni->ni_challenge, 1108 IEEE80211_CHALLENGE_LEN); 1109 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1110 ni, "shared key %sauth request", allocbs ? "" : "re"); 1111 /* 1112 * When the ACL policy is set to RADIUS we defer the 1113 * authorization to a user agent. Dispatch an event, 1114 * a subsequent MLME call will decide the fate of the 1115 * station. If the user agent is not present then the 1116 * node will be reclaimed due to inactivity. 1117 */ 1118 if (vap->iv_acl != NULL && 1119 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1120 IEEE80211_NOTE_MAC(vap, 1121 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1122 ni->ni_macaddr, 1123 "%s", "station authentication defered (radius acl)"); 1124 ieee80211_notify_node_auth(ni); 1125 return; 1126 } 1127 break; 1128 case IEEE80211_AUTH_SHARED_RESPONSE: 1129 if (ni == vap->iv_bss) { 1130 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1131 ni->ni_macaddr, "shared key response", 1132 "%s", "unknown station"); 1133 /* NB: don't send a response */ 1134 return; 1135 } 1136 if (ni->ni_challenge == NULL) { 1137 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1138 ni->ni_macaddr, "shared key response", 1139 "%s", "no challenge recorded"); 1140 vap->iv_stats.is_rx_bad_auth++; 1141 estatus = IEEE80211_STATUS_CHALLENGE; 1142 goto bad; 1143 } 1144 if (memcmp(ni->ni_challenge, &challenge[2], 1145 challenge[1]) != 0) { 1146 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1147 ni->ni_macaddr, "shared key response", 1148 "%s", "challenge mismatch"); 1149 vap->iv_stats.is_rx_auth_fail++; 1150 estatus = IEEE80211_STATUS_CHALLENGE; 1151 goto bad; 1152 } 1153 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1154 ni, "%s", "station authenticated (shared key)"); 1155 ieee80211_node_authorize(ni); 1156 break; 1157 default: 1158 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1159 ni->ni_macaddr, "shared key auth", 1160 "bad seq %d", seq); 1161 vap->iv_stats.is_rx_bad_auth++; 1162 estatus = IEEE80211_STATUS_SEQUENCE; 1163 goto bad; 1164 } 1165 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1166 return; 1167bad: 1168 /* 1169 * Send an error response; but only when operating as an AP. 1170 */ 1171 /* XXX hack to workaround calling convention */ 1172 ieee80211_send_error(ni, wh->i_addr2, 1173 IEEE80211_FC0_SUBTYPE_AUTH, 1174 (seq + 1) | (estatus<<16)); 1175} 1176 1177/* 1178 * Convert a WPA cipher selector OUI to an internal 1179 * cipher algorithm. Where appropriate we also 1180 * record any key length. 1181 */ 1182static int 1183wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1184{ 1185#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1186 uint32_t w = LE_READ_4(sel); 1187 1188 switch (w) { 1189 case WPA_SEL(WPA_CSE_NULL): 1190 return IEEE80211_CIPHER_NONE; 1191 case WPA_SEL(WPA_CSE_WEP40): 1192 if (keylen) 1193 *keylen = 40 / NBBY; 1194 return IEEE80211_CIPHER_WEP; 1195 case WPA_SEL(WPA_CSE_WEP104): 1196 if (keylen) 1197 *keylen = 104 / NBBY; 1198 return IEEE80211_CIPHER_WEP; 1199 case WPA_SEL(WPA_CSE_TKIP): 1200 return IEEE80211_CIPHER_TKIP; 1201 case WPA_SEL(WPA_CSE_CCMP): 1202 return IEEE80211_CIPHER_AES_CCM; 1203 } 1204 return 32; /* NB: so 1<< is discarded */ 1205#undef WPA_SEL 1206} 1207 1208/* 1209 * Convert a WPA key management/authentication algorithm 1210 * to an internal code. 1211 */ 1212static int 1213wpa_keymgmt(const uint8_t *sel) 1214{ 1215#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1216 uint32_t w = LE_READ_4(sel); 1217 1218 switch (w) { 1219 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1220 return WPA_ASE_8021X_UNSPEC; 1221 case WPA_SEL(WPA_ASE_8021X_PSK): 1222 return WPA_ASE_8021X_PSK; 1223 case WPA_SEL(WPA_ASE_NONE): 1224 return WPA_ASE_NONE; 1225 } 1226 return 0; /* NB: so is discarded */ 1227#undef WPA_SEL 1228} 1229 1230/* 1231 * Parse a WPA information element to collect parameters. 1232 * Note that we do not validate security parameters; that 1233 * is handled by the authenticator; the parsing done here 1234 * is just for internal use in making operational decisions. 1235 */ 1236static int 1237ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1238 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1239{ 1240 uint8_t len = frm[1]; 1241 uint32_t w; 1242 int n; 1243 1244 /* 1245 * Check the length once for fixed parts: OUI, type, 1246 * version, mcast cipher, and 2 selector counts. 1247 * Other, variable-length data, must be checked separately. 1248 */ 1249 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1250 IEEE80211_DISCARD_IE(vap, 1251 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1252 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1253 return IEEE80211_REASON_IE_INVALID; 1254 } 1255 if (len < 14) { 1256 IEEE80211_DISCARD_IE(vap, 1257 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1258 wh, "WPA", "too short, len %u", len); 1259 return IEEE80211_REASON_IE_INVALID; 1260 } 1261 frm += 6, len -= 4; /* NB: len is payload only */ 1262 /* NB: iswpaoui already validated the OUI and type */ 1263 w = LE_READ_2(frm); 1264 if (w != WPA_VERSION) { 1265 IEEE80211_DISCARD_IE(vap, 1266 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1267 wh, "WPA", "bad version %u", w); 1268 return IEEE80211_REASON_IE_INVALID; 1269 } 1270 frm += 2, len -= 2; 1271 1272 memset(rsn, 0, sizeof(*rsn)); 1273 1274 /* multicast/group cipher */ 1275 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1276 frm += 4, len -= 4; 1277 1278 /* unicast ciphers */ 1279 n = LE_READ_2(frm); 1280 frm += 2, len -= 2; 1281 if (len < n*4+2) { 1282 IEEE80211_DISCARD_IE(vap, 1283 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1284 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1285 len, n); 1286 return IEEE80211_REASON_IE_INVALID; 1287 } 1288 w = 0; 1289 for (; n > 0; n--) { 1290 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1291 frm += 4, len -= 4; 1292 } 1293 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1294 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1295 else 1296 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1297 1298 /* key management algorithms */ 1299 n = LE_READ_2(frm); 1300 frm += 2, len -= 2; 1301 if (len < n*4) { 1302 IEEE80211_DISCARD_IE(vap, 1303 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1304 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1305 len, n); 1306 return IEEE80211_REASON_IE_INVALID; 1307 } 1308 w = 0; 1309 for (; n > 0; n--) { 1310 w |= wpa_keymgmt(frm); 1311 frm += 4, len -= 4; 1312 } 1313 if (w & WPA_ASE_8021X_UNSPEC) 1314 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1315 else 1316 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1317 1318 if (len > 2) /* optional capabilities */ 1319 rsn->rsn_caps = LE_READ_2(frm); 1320 1321 return 0; 1322} 1323 1324/* 1325 * Convert an RSN cipher selector OUI to an internal 1326 * cipher algorithm. Where appropriate we also 1327 * record any key length. 1328 */ 1329static int 1330rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1331{ 1332#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1333 uint32_t w = LE_READ_4(sel); 1334 1335 switch (w) { 1336 case RSN_SEL(RSN_CSE_NULL): 1337 return IEEE80211_CIPHER_NONE; 1338 case RSN_SEL(RSN_CSE_WEP40): 1339 if (keylen) 1340 *keylen = 40 / NBBY; 1341 return IEEE80211_CIPHER_WEP; 1342 case RSN_SEL(RSN_CSE_WEP104): 1343 if (keylen) 1344 *keylen = 104 / NBBY; 1345 return IEEE80211_CIPHER_WEP; 1346 case RSN_SEL(RSN_CSE_TKIP): 1347 return IEEE80211_CIPHER_TKIP; 1348 case RSN_SEL(RSN_CSE_CCMP): 1349 return IEEE80211_CIPHER_AES_CCM; 1350 case RSN_SEL(RSN_CSE_WRAP): 1351 return IEEE80211_CIPHER_AES_OCB; 1352 } 1353 return 32; /* NB: so 1<< is discarded */ 1354#undef WPA_SEL 1355} 1356 1357/* 1358 * Convert an RSN key management/authentication algorithm 1359 * to an internal code. 1360 */ 1361static int 1362rsn_keymgmt(const uint8_t *sel) 1363{ 1364#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1365 uint32_t w = LE_READ_4(sel); 1366 1367 switch (w) { 1368 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1369 return RSN_ASE_8021X_UNSPEC; 1370 case RSN_SEL(RSN_ASE_8021X_PSK): 1371 return RSN_ASE_8021X_PSK; 1372 case RSN_SEL(RSN_ASE_NONE): 1373 return RSN_ASE_NONE; 1374 } 1375 return 0; /* NB: so is discarded */ 1376#undef RSN_SEL 1377} 1378 1379/* 1380 * Parse a WPA/RSN information element to collect parameters 1381 * and validate the parameters against what has been 1382 * configured for the system. 1383 */ 1384static int 1385ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1386 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1387{ 1388 uint8_t len = frm[1]; 1389 uint32_t w; 1390 int n; 1391 1392 /* 1393 * Check the length once for fixed parts: 1394 * version, mcast cipher, and 2 selector counts. 1395 * Other, variable-length data, must be checked separately. 1396 */ 1397 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1398 IEEE80211_DISCARD_IE(vap, 1399 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1400 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1401 return IEEE80211_REASON_IE_INVALID; 1402 } 1403 if (len < 10) { 1404 IEEE80211_DISCARD_IE(vap, 1405 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1406 wh, "RSN", "too short, len %u", len); 1407 return IEEE80211_REASON_IE_INVALID; 1408 } 1409 frm += 2; 1410 w = LE_READ_2(frm); 1411 if (w != RSN_VERSION) { 1412 IEEE80211_DISCARD_IE(vap, 1413 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1414 wh, "RSN", "bad version %u", w); 1415 return IEEE80211_REASON_IE_INVALID; 1416 } 1417 frm += 2, len -= 2; 1418 1419 memset(rsn, 0, sizeof(*rsn)); 1420 1421 /* multicast/group cipher */ 1422 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1423 frm += 4, len -= 4; 1424 1425 /* unicast ciphers */ 1426 n = LE_READ_2(frm); 1427 frm += 2, len -= 2; 1428 if (len < n*4+2) { 1429 IEEE80211_DISCARD_IE(vap, 1430 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1431 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1432 len, n); 1433 return IEEE80211_REASON_IE_INVALID; 1434 } 1435 w = 0; 1436 for (; n > 0; n--) { 1437 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1438 frm += 4, len -= 4; 1439 } 1440 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1441 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1442 else 1443 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1444 1445 /* key management algorithms */ 1446 n = LE_READ_2(frm); 1447 frm += 2, len -= 2; 1448 if (len < n*4) { 1449 IEEE80211_DISCARD_IE(vap, 1450 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1451 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1452 len, n); 1453 return IEEE80211_REASON_IE_INVALID; 1454 } 1455 w = 0; 1456 for (; n > 0; n--) { 1457 w |= rsn_keymgmt(frm); 1458 frm += 4, len -= 4; 1459 } 1460 if (w & RSN_ASE_8021X_UNSPEC) 1461 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1462 else 1463 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1464 1465 /* optional RSN capabilities */ 1466 if (len > 2) 1467 rsn->rsn_caps = LE_READ_2(frm); 1468 /* XXXPMKID */ 1469 1470 return 0; 1471} 1472 1473/* 1474 * WPA/802.11i assocation request processing. 1475 */ 1476static int 1477wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1478 const struct ieee80211_frame *wh, const uint8_t *wpa, 1479 const uint8_t *rsn, uint16_t capinfo) 1480{ 1481 struct ieee80211vap *vap = ni->ni_vap; 1482 uint8_t reason; 1483 int badwparsn; 1484 1485 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1486 if (wpa == NULL && rsn == NULL) { 1487 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1488 /* 1489 * W-Fi Protected Setup (WPS) permits 1490 * clients to associate and pass EAPOL frames 1491 * to establish initial credentials. 1492 */ 1493 ni->ni_flags |= IEEE80211_NODE_WPS; 1494 return 1; 1495 } 1496 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1497 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1498 /* 1499 * Transitional Security Network. Permits clients 1500 * to associate and use WEP while WPA is configured. 1501 */ 1502 ni->ni_flags |= IEEE80211_NODE_TSN; 1503 return 1; 1504 } 1505 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1506 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1507 vap->iv_stats.is_rx_assoc_badwpaie++; 1508 reason = IEEE80211_REASON_IE_INVALID; 1509 goto bad; 1510 } 1511 /* assert right association security credentials */ 1512 badwparsn = 0; /* NB: to silence compiler */ 1513 switch (vap->iv_flags & IEEE80211_F_WPA) { 1514 case IEEE80211_F_WPA1: 1515 badwparsn = (wpa == NULL); 1516 break; 1517 case IEEE80211_F_WPA2: 1518 badwparsn = (rsn == NULL); 1519 break; 1520 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1521 badwparsn = (wpa == NULL && rsn == NULL); 1522 break; 1523 } 1524 if (badwparsn) { 1525 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1526 wh, NULL, 1527 "%s", "missing WPA/RSN IE in association request"); 1528 vap->iv_stats.is_rx_assoc_badwpaie++; 1529 reason = IEEE80211_REASON_IE_INVALID; 1530 goto bad; 1531 } 1532 /* 1533 * Parse WPA/RSN information element. 1534 */ 1535 if (wpa != NULL) 1536 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1537 else 1538 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1539 if (reason != 0) { 1540 /* XXX distinguish WPA/RSN? */ 1541 vap->iv_stats.is_rx_assoc_badwpaie++; 1542 goto bad; 1543 } 1544 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1545 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1546 wpa != NULL ? "WPA" : "RSN", 1547 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1548 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1549 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1550 1551 return 1; 1552bad: 1553 ieee80211_node_deauth(ni, reason); 1554 return 0; 1555} 1556 1557/* XXX find a better place for definition */ 1558struct l2_update_frame { 1559 struct ether_header eh; 1560 uint8_t dsap; 1561 uint8_t ssap; 1562 uint8_t control; 1563 uint8_t xid[3]; 1564} __packed; 1565 1566/* 1567 * Deliver a TGf L2UF frame on behalf of a station. 1568 * This primes any bridge when the station is roaming 1569 * between ap's on the same wired network. 1570 */ 1571static void 1572ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1573{ 1574 struct ieee80211vap *vap = ni->ni_vap; 1575 struct ifnet *ifp = vap->iv_ifp; 1576 struct mbuf *m; 1577 struct l2_update_frame *l2uf; 1578 struct ether_header *eh; 1579 1580 m = m_gethdr(M_NOWAIT, MT_DATA); 1581 if (m == NULL) { 1582 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1583 "%s", "no mbuf for l2uf frame"); 1584 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1585 return; 1586 } 1587 l2uf = mtod(m, struct l2_update_frame *); 1588 eh = &l2uf->eh; 1589 /* dst: Broadcast address */ 1590 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1591 /* src: associated STA */ 1592 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1593 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1594 1595 l2uf->dsap = 0; 1596 l2uf->ssap = 0; 1597 l2uf->control = 0xf5; 1598 l2uf->xid[0] = 0x81; 1599 l2uf->xid[1] = 0x80; 1600 l2uf->xid[2] = 0x00; 1601 1602 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1603 hostap_deliver_data(vap, ni, m); 1604} 1605 1606static void 1607ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1608 int reassoc, int resp, const char *tag, int rate) 1609{ 1610 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1611 "deny %s request, %s rate set mismatch, rate/MCS %d", 1612 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1613 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1614 ieee80211_node_leave(ni); 1615} 1616 1617static void 1618capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1619 int reassoc, int resp, const char *tag, int capinfo) 1620{ 1621 struct ieee80211vap *vap = ni->ni_vap; 1622 1623 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1624 "deny %s request, %s mismatch 0x%x", 1625 reassoc ? "reassoc" : "assoc", tag, capinfo); 1626 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1627 ieee80211_node_leave(ni); 1628 vap->iv_stats.is_rx_assoc_capmismatch++; 1629} 1630 1631static void 1632htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1633 int reassoc, int resp) 1634{ 1635 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1636 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1637 /* XXX no better code */ 1638 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS); 1639 ieee80211_node_leave(ni); 1640} 1641 1642static void 1643authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1644 int algo, int seq, int status) 1645{ 1646 struct ieee80211vap *vap = ni->ni_vap; 1647 1648 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1649 wh, NULL, "unsupported alg %d", algo); 1650 vap->iv_stats.is_rx_auth_unsupported++; 1651 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1652 seq | (status << 16)); 1653} 1654 1655static __inline int 1656ishtmixed(const uint8_t *ie) 1657{ 1658 const struct ieee80211_ie_htinfo *ht = 1659 (const struct ieee80211_ie_htinfo *) ie; 1660 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1661 IEEE80211_HTINFO_OPMODE_MIXED; 1662} 1663 1664static int 1665is11bclient(const uint8_t *rates, const uint8_t *xrates) 1666{ 1667 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1668 int i; 1669 1670 /* NB: the 11b clients we care about will not have xrates */ 1671 if (xrates != NULL || rates == NULL) 1672 return 0; 1673 for (i = 0; i < rates[1]; i++) { 1674 int r = rates[2+i] & IEEE80211_RATE_VAL; 1675 if (r > 2*11 || ((1<<r) & brates) == 0) 1676 return 0; 1677 } 1678 return 1; 1679} 1680 1681static void 1682hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1683 int subtype, int rssi, int nf) 1684{ 1685 struct ieee80211vap *vap = ni->ni_vap; 1686 struct ieee80211com *ic = ni->ni_ic; 1687 struct ieee80211_frame *wh; 1688 uint8_t *frm, *efrm, *sfrm; 1689 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1690 int reassoc, resp; 1691 uint8_t rate; 1692 1693 wh = mtod(m0, struct ieee80211_frame *); 1694 frm = (uint8_t *)&wh[1]; 1695 efrm = mtod(m0, uint8_t *) + m0->m_len; 1696 switch (subtype) { 1697 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1698 case IEEE80211_FC0_SUBTYPE_BEACON: { 1699 struct ieee80211_scanparams scan; 1700 /* 1701 * We process beacon/probe response frames when scanning; 1702 * otherwise we check beacon frames for overlapping non-ERP 1703 * BSS in 11g and/or overlapping legacy BSS when in HT. 1704 */ 1705 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1706 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1707 vap->iv_stats.is_rx_mgtdiscard++; 1708 return; 1709 } 1710 /* NB: accept off-channel frames */ 1711 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1712 return; 1713 /* 1714 * Count frame now that we know it's to be processed. 1715 */ 1716 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1717 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1718 IEEE80211_NODE_STAT(ni, rx_beacons); 1719 } else 1720 IEEE80211_NODE_STAT(ni, rx_proberesp); 1721 /* 1722 * If scanning, just pass information to the scan module. 1723 */ 1724 if (ic->ic_flags & IEEE80211_F_SCAN) { 1725 if (scan.status == 0 && /* NB: on channel */ 1726 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1727 /* 1728 * Actively scanning a channel marked passive; 1729 * send a probe request now that we know there 1730 * is 802.11 traffic present. 1731 * 1732 * XXX check if the beacon we recv'd gives 1733 * us what we need and suppress the probe req 1734 */ 1735 ieee80211_probe_curchan(vap, 1); 1736 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1737 } 1738 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1739 return; 1740 } 1741 /* 1742 * Check beacon for overlapping bss w/ non ERP stations. 1743 * If we detect one and protection is configured but not 1744 * enabled, enable it and start a timer that'll bring us 1745 * out if we stop seeing the bss. 1746 */ 1747 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1748 scan.status == 0 && /* NB: on-channel */ 1749 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1750 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1751 ic->ic_lastnonerp = ticks; 1752 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1753 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1754 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1755 IEEE80211_NOTE_FRAME(vap, 1756 IEEE80211_MSG_ASSOC, wh, 1757 "non-ERP present on channel %d " 1758 "(saw erp 0x%x from channel %d), " 1759 "enable use of protection", 1760 ic->ic_curchan->ic_ieee, 1761 scan.erp, scan.chan); 1762 ic->ic_flags |= IEEE80211_F_USEPROT; 1763 ieee80211_notify_erp(ic); 1764 } 1765 } 1766 /* 1767 * Check beacon for non-HT station on HT channel 1768 * and update HT BSS occupancy as appropriate. 1769 */ 1770 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1771 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1772 /* 1773 * Off control channel; only check frames 1774 * that come in the extension channel when 1775 * operating w/ HT40. 1776 */ 1777 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1778 break; 1779 if (scan.chan != ic->ic_curchan->ic_extieee) 1780 break; 1781 } 1782 if (scan.htinfo == NULL) { 1783 ieee80211_htprot_update(ic, 1784 IEEE80211_HTINFO_OPMODE_PROTOPT | 1785 IEEE80211_HTINFO_NONHT_PRESENT); 1786 } else if (ishtmixed(scan.htinfo)) { 1787 /* XXX? take NONHT_PRESENT from beacon? */ 1788 ieee80211_htprot_update(ic, 1789 IEEE80211_HTINFO_OPMODE_MIXED | 1790 IEEE80211_HTINFO_NONHT_PRESENT); 1791 } 1792 } 1793 break; 1794 } 1795 1796 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1797 if (vap->iv_state != IEEE80211_S_RUN) { 1798 vap->iv_stats.is_rx_mgtdiscard++; 1799 return; 1800 } 1801 /* 1802 * prreq frame format 1803 * [tlv] ssid 1804 * [tlv] supported rates 1805 * [tlv] extended supported rates 1806 */ 1807 ssid = rates = xrates = NULL; 1808 sfrm = frm; 1809 while (efrm - frm > 1) { 1810 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1811 switch (*frm) { 1812 case IEEE80211_ELEMID_SSID: 1813 ssid = frm; 1814 break; 1815 case IEEE80211_ELEMID_RATES: 1816 rates = frm; 1817 break; 1818 case IEEE80211_ELEMID_XRATES: 1819 xrates = frm; 1820 break; 1821 } 1822 frm += frm[1] + 2; 1823 } 1824 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1825 if (xrates != NULL) 1826 IEEE80211_VERIFY_ELEMENT(xrates, 1827 IEEE80211_RATE_MAXSIZE - rates[1], return); 1828 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1829 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1830 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1831 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1832 wh, NULL, 1833 "%s", "no ssid with ssid suppression enabled"); 1834 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1835 return; 1836 } 1837 1838 /* XXX find a better class or define it's own */ 1839 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1840 "%s", "recv probe req"); 1841 /* 1842 * Some legacy 11b clients cannot hack a complete 1843 * probe response frame. When the request includes 1844 * only a bare-bones rate set, communicate this to 1845 * the transmit side. 1846 */ 1847 ieee80211_send_proberesp(vap, wh->i_addr2, 1848 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1849 break; 1850 1851 case IEEE80211_FC0_SUBTYPE_AUTH: { 1852 uint16_t algo, seq, status; 1853 1854 if (vap->iv_state != IEEE80211_S_RUN) { 1855 vap->iv_stats.is_rx_mgtdiscard++; 1856 return; 1857 } 1858 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1859 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1860 wh, NULL, "%s", "wrong bssid"); 1861 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1862 return; 1863 } 1864 /* 1865 * auth frame format 1866 * [2] algorithm 1867 * [2] sequence 1868 * [2] status 1869 * [tlv*] challenge 1870 */ 1871 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1872 algo = le16toh(*(uint16_t *)frm); 1873 seq = le16toh(*(uint16_t *)(frm + 2)); 1874 status = le16toh(*(uint16_t *)(frm + 4)); 1875 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1876 "recv auth frame with algorithm %d seq %d", algo, seq); 1877 /* 1878 * Consult the ACL policy module if setup. 1879 */ 1880 if (vap->iv_acl != NULL && 1881 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1882 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1883 wh, NULL, "%s", "disallowed by ACL"); 1884 vap->iv_stats.is_rx_acl++; 1885 ieee80211_send_error(ni, wh->i_addr2, 1886 IEEE80211_FC0_SUBTYPE_AUTH, 1887 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1888 return; 1889 } 1890 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1891 IEEE80211_DISCARD(vap, 1892 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1893 wh, NULL, "%s", "TKIP countermeasures enabled"); 1894 vap->iv_stats.is_rx_auth_countermeasures++; 1895 ieee80211_send_error(ni, wh->i_addr2, 1896 IEEE80211_FC0_SUBTYPE_AUTH, 1897 IEEE80211_REASON_MIC_FAILURE); 1898 return; 1899 } 1900 if (algo == IEEE80211_AUTH_ALG_SHARED) 1901 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1902 seq, status); 1903 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1904 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1905 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1906 authalgreject(ni, wh, algo, 1907 seq+1, IEEE80211_STATUS_ALG); 1908 return; 1909 } else { 1910 /* 1911 * We assume that an unknown algorithm is the result 1912 * of a decryption failure on a shared key auth frame; 1913 * return a status code appropriate for that instead 1914 * of IEEE80211_STATUS_ALG. 1915 * 1916 * NB: a seq# of 4 is intentional; the decrypted 1917 * frame likely has a bogus seq value. 1918 */ 1919 authalgreject(ni, wh, algo, 1920 4, IEEE80211_STATUS_CHALLENGE); 1921 return; 1922 } 1923 break; 1924 } 1925 1926 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1927 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1928 uint16_t capinfo, lintval; 1929 struct ieee80211_rsnparms rsnparms; 1930 1931 if (vap->iv_state != IEEE80211_S_RUN) { 1932 vap->iv_stats.is_rx_mgtdiscard++; 1933 return; 1934 } 1935 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1936 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1937 wh, NULL, "%s", "wrong bssid"); 1938 vap->iv_stats.is_rx_assoc_bss++; 1939 return; 1940 } 1941 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1942 reassoc = 1; 1943 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1944 } else { 1945 reassoc = 0; 1946 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1947 } 1948 if (ni == vap->iv_bss) { 1949 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1950 "deny %s request, sta not authenticated", 1951 reassoc ? "reassoc" : "assoc"); 1952 ieee80211_send_error(ni, wh->i_addr2, 1953 IEEE80211_FC0_SUBTYPE_DEAUTH, 1954 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1955 vap->iv_stats.is_rx_assoc_notauth++; 1956 return; 1957 } 1958 1959 /* 1960 * asreq frame format 1961 * [2] capability information 1962 * [2] listen interval 1963 * [6*] current AP address (reassoc only) 1964 * [tlv] ssid 1965 * [tlv] supported rates 1966 * [tlv] extended supported rates 1967 * [tlv] WPA or RSN 1968 * [tlv] HT capabilities 1969 * [tlv] Atheros capabilities 1970 */ 1971 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1972 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1973 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1974 if (reassoc) 1975 frm += 6; /* ignore current AP info */ 1976 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1977 sfrm = frm; 1978 while (efrm - frm > 1) { 1979 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1980 switch (*frm) { 1981 case IEEE80211_ELEMID_SSID: 1982 ssid = frm; 1983 break; 1984 case IEEE80211_ELEMID_RATES: 1985 rates = frm; 1986 break; 1987 case IEEE80211_ELEMID_XRATES: 1988 xrates = frm; 1989 break; 1990 case IEEE80211_ELEMID_RSN: 1991 rsn = frm; 1992 break; 1993 case IEEE80211_ELEMID_HTCAP: 1994 htcap = frm; 1995 break; 1996 case IEEE80211_ELEMID_VENDOR: 1997 if (iswpaoui(frm)) 1998 wpa = frm; 1999 else if (iswmeinfo(frm)) 2000 wme = frm; 2001#ifdef IEEE80211_SUPPORT_SUPERG 2002 else if (isatherosoui(frm)) 2003 ath = frm; 2004#endif 2005 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) { 2006 if (ishtcapoui(frm) && htcap == NULL) 2007 htcap = frm; 2008 } 2009 break; 2010 } 2011 frm += frm[1] + 2; 2012 } 2013 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 2014 if (xrates != NULL) 2015 IEEE80211_VERIFY_ELEMENT(xrates, 2016 IEEE80211_RATE_MAXSIZE - rates[1], return); 2017 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 2018 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 2019 if (htcap != NULL) { 2020 IEEE80211_VERIFY_LENGTH(htcap[1], 2021 htcap[0] == IEEE80211_ELEMID_VENDOR ? 2022 4 + sizeof(struct ieee80211_ie_htcap)-2 : 2023 sizeof(struct ieee80211_ie_htcap)-2, 2024 return); /* XXX just NULL out? */ 2025 } 2026 2027 if ((vap->iv_flags & IEEE80211_F_WPA) && 2028 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 2029 return; 2030 /* discard challenge after association */ 2031 if (ni->ni_challenge != NULL) { 2032 free(ni->ni_challenge, M_80211_NODE); 2033 ni->ni_challenge = NULL; 2034 } 2035 /* NB: 802.11 spec says to ignore station's privacy bit */ 2036 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 2037 capinfomismatch(ni, wh, reassoc, resp, 2038 "capability", capinfo); 2039 return; 2040 } 2041 /* 2042 * Disallow re-associate w/ invalid slot time setting. 2043 */ 2044 if (ni->ni_associd != 0 && 2045 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2046 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2047 capinfomismatch(ni, wh, reassoc, resp, 2048 "slot time", capinfo); 2049 return; 2050 } 2051 rate = ieee80211_setup_rates(ni, rates, xrates, 2052 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2053 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2054 if (rate & IEEE80211_RATE_BASIC) { 2055 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2056 vap->iv_stats.is_rx_assoc_norate++; 2057 return; 2058 } 2059 /* 2060 * If constrained to 11g-only stations reject an 2061 * 11b-only station. We cheat a bit here by looking 2062 * at the max negotiated xmit rate and assuming anyone 2063 * with a best rate <24Mb/s is an 11b station. 2064 */ 2065 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2066 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2067 vap->iv_stats.is_rx_assoc_norate++; 2068 return; 2069 } 2070 /* 2071 * Do HT rate set handling and setup HT node state. 2072 */ 2073 ni->ni_chan = vap->iv_bss->ni_chan; 2074 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2075 rate = ieee80211_setup_htrates(ni, htcap, 2076 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2077 IEEE80211_F_DOBRS); 2078 if (rate & IEEE80211_RATE_BASIC) { 2079 ratesetmismatch(ni, wh, reassoc, resp, 2080 "HT", rate); 2081 vap->iv_stats.is_ht_assoc_norate++; 2082 return; 2083 } 2084 ieee80211_ht_node_init(ni); 2085 ieee80211_ht_updatehtcap(ni, htcap); 2086 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2087 ieee80211_ht_node_cleanup(ni); 2088#ifdef IEEE80211_SUPPORT_SUPERG 2089 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2090 ieee80211_ff_node_cleanup(ni); 2091#endif 2092 /* 2093 * Allow AMPDU operation only with unencrypted traffic 2094 * or AES-CCM; the 11n spec only specifies these ciphers 2095 * so permitting any others is undefined and can lead 2096 * to interoperability problems. 2097 */ 2098 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2099 (((vap->iv_flags & IEEE80211_F_WPA) && 2100 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2101 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2102 IEEE80211_NOTE(vap, 2103 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2104 "disallow HT use because WEP or TKIP requested, " 2105 "capinfo 0x%x ucastcipher %d", capinfo, 2106 rsnparms.rsn_ucastcipher); 2107 ieee80211_ht_node_cleanup(ni); 2108 vap->iv_stats.is_ht_assoc_downgrade++; 2109 } 2110 /* 2111 * If constrained to 11n-only stations reject legacy stations. 2112 */ 2113 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) && 2114 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2115 htcapmismatch(ni, wh, reassoc, resp); 2116 vap->iv_stats.is_ht_assoc_nohtcap++; 2117 return; 2118 } 2119 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2120 ni->ni_noise = nf; 2121 ni->ni_intval = lintval; 2122 ni->ni_capinfo = capinfo; 2123 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2124 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2125 /* 2126 * Store the IEs. 2127 * XXX maybe better to just expand 2128 */ 2129 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2130#define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2131 if (wpa != NULL) 2132 setie(wpa_ie, wpa - sfrm); 2133 if (rsn != NULL) 2134 setie(rsn_ie, rsn - sfrm); 2135 if (htcap != NULL) 2136 setie(htcap_ie, htcap - sfrm); 2137 if (wme != NULL) { 2138 setie(wme_ie, wme - sfrm); 2139 /* 2140 * Mark node as capable of QoS. 2141 */ 2142 ni->ni_flags |= IEEE80211_NODE_QOS; 2143 } else 2144 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2145#ifdef IEEE80211_SUPPORT_SUPERG 2146 if (ath != NULL) { 2147 setie(ath_ie, ath - sfrm); 2148 /* 2149 * Parse ATH station parameters. 2150 */ 2151 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2152 } else 2153#endif 2154 ni->ni_ath_flags = 0; 2155#undef setie 2156 } else { 2157 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2158 ni->ni_ath_flags = 0; 2159 } 2160 ieee80211_node_join(ni, resp); 2161 ieee80211_deliver_l2uf(ni); 2162 break; 2163 } 2164 2165 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2166 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2167 uint16_t reason; 2168 2169 if (vap->iv_state != IEEE80211_S_RUN || 2170 /* NB: can happen when in promiscuous mode */ 2171 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2172 vap->iv_stats.is_rx_mgtdiscard++; 2173 break; 2174 } 2175 /* 2176 * deauth/disassoc frame format 2177 * [2] reason 2178 */ 2179 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2180 reason = le16toh(*(uint16_t *)frm); 2181 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2182 vap->iv_stats.is_rx_deauth++; 2183 IEEE80211_NODE_STAT(ni, rx_deauth); 2184 } else { 2185 vap->iv_stats.is_rx_disassoc++; 2186 IEEE80211_NODE_STAT(ni, rx_disassoc); 2187 } 2188 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2189 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2190 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2191 if (ni != vap->iv_bss) 2192 ieee80211_node_leave(ni); 2193 break; 2194 } 2195 2196 case IEEE80211_FC0_SUBTYPE_ACTION: 2197 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 2198 if (ni == vap->iv_bss) { 2199 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2200 wh, NULL, "%s", "unknown node"); 2201 vap->iv_stats.is_rx_mgtdiscard++; 2202 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 2203 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 2204 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2205 wh, NULL, "%s", "not for us"); 2206 vap->iv_stats.is_rx_mgtdiscard++; 2207 } else if (vap->iv_state != IEEE80211_S_RUN) { 2208 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2209 wh, NULL, "wrong state %s", 2210 ieee80211_state_name[vap->iv_state]); 2211 vap->iv_stats.is_rx_mgtdiscard++; 2212 } else { 2213 if (ieee80211_parse_action(ni, m0) == 0) 2214 (void)ic->ic_recv_action(ni, wh, frm, efrm); 2215 } 2216 break; 2217 2218 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2219 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2220 case IEEE80211_FC0_SUBTYPE_ATIM: 2221 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 2222 wh, NULL, "%s", "not handled"); 2223 vap->iv_stats.is_rx_mgtdiscard++; 2224 break; 2225 2226 default: 2227 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2228 wh, "mgt", "subtype 0x%x not handled", subtype); 2229 vap->iv_stats.is_rx_badsubtype++; 2230 break; 2231 } 2232} 2233 2234static void 2235hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2236{ 2237 switch (subtype) { 2238 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2239 hostap_recv_pspoll(ni, m); 2240 break; 2241 case IEEE80211_FC0_SUBTYPE_BAR: 2242 ieee80211_recv_bar(ni, m); 2243 break; 2244 } 2245} 2246 2247/* 2248 * Process a received ps-poll frame. 2249 */ 2250static void 2251hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2252{ 2253 struct ieee80211vap *vap = ni->ni_vap; 2254 struct ieee80211_frame_min *wh; 2255 struct ifnet *ifp; 2256 struct mbuf *m; 2257 uint16_t aid; 2258 int qlen; 2259 2260 wh = mtod(m0, struct ieee80211_frame_min *); 2261 if (ni->ni_associd == 0) { 2262 IEEE80211_DISCARD(vap, 2263 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2264 (struct ieee80211_frame *) wh, NULL, 2265 "%s", "unassociated station"); 2266 vap->iv_stats.is_ps_unassoc++; 2267 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2268 IEEE80211_REASON_NOT_ASSOCED); 2269 return; 2270 } 2271 2272 aid = le16toh(*(uint16_t *)wh->i_dur); 2273 if (aid != ni->ni_associd) { 2274 IEEE80211_DISCARD(vap, 2275 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2276 (struct ieee80211_frame *) wh, NULL, 2277 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2278 ni->ni_associd, aid); 2279 vap->iv_stats.is_ps_badaid++; 2280 /* 2281 * NB: We used to deauth the station but it turns out 2282 * the Blackberry Curve 8230 (and perhaps other devices) 2283 * sometimes send the wrong AID when WME is negotiated. 2284 * Being more lenient here seems ok as we already check 2285 * the station is associated and we only return frames 2286 * queued for the station (i.e. we don't use the AID). 2287 */ 2288 return; 2289 } 2290 2291 /* Okay, take the first queued packet and put it out... */ 2292 m = ieee80211_node_psq_dequeue(ni, &qlen); 2293 if (m == NULL) { 2294 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2295 "%s", "recv ps-poll, but queue empty"); 2296 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2297 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2298 if (vap->iv_set_tim != NULL) 2299 vap->iv_set_tim(ni, 0); /* just in case */ 2300 return; 2301 } 2302 /* 2303 * If there are more packets, set the more packets bit 2304 * in the packet dispatched to the station; otherwise 2305 * turn off the TIM bit. 2306 */ 2307 if (qlen != 0) { 2308 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2309 "recv ps-poll, send packet, %u still queued", qlen); 2310 m->m_flags |= M_MORE_DATA; 2311 } else { 2312 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2313 "%s", "recv ps-poll, send packet, queue empty"); 2314 if (vap->iv_set_tim != NULL) 2315 vap->iv_set_tim(ni, 0); 2316 } 2317 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2318 2319 if (m->m_flags & M_ENCAP) 2320 ifp = vap->iv_ic->ic_ifp; 2321 else 2322 ifp = vap->iv_ifp; 2323 IF_ENQUEUE(&ifp->if_snd, m); 2324 if_start(ifp); 2325} 2326