sys/net80211/ieee80211_sta.c

   1 /*-
   2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 Station 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/if_dl.h>
  54 #include <net/if_var.h>
  55 #include <net/ethernet.h>
  56
  57 #include <net/bpf.h>
  58
  59 #include <net80211/ieee80211_var.h>
  60 #include <net80211/ieee80211_sta.h>
  61 #include <net80211/ieee80211_input.h>
  62 #ifdef IEEE80211_SUPPORT_SUPERG
  63 #include <net80211/ieee80211_superg.h>
  64 #endif
  65 #include <net80211/ieee80211_ratectl.h>
  66 #include <net80211/ieee80211_sta.h>
  67
  68 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  69
  70 static  void sta_vattach(struct ieee80211vap *);
  71 static  void sta_beacon_miss(struct ieee80211vap *);
  72 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  73 static  int sta_input(struct ieee80211_node *, struct mbuf *,
  74             const struct ieee80211_rx_stats *, int, int);
  75 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  76             int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
  77 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  78
  79 void
  80 ieee80211_sta_attach(struct ieee80211com *ic)
  81 {
  82         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  83 }
  84
  85 void
  86 ieee80211_sta_detach(struct ieee80211com *ic)
  87 {
  88 }
  89
  90 static void
  91 sta_vdetach(struct ieee80211vap *vap)
  92 {
  93 }
  94
  95 static void
  96 sta_vattach(struct ieee80211vap *vap)
  97 {
  98         vap->iv_newstate = sta_newstate;
  99         vap->iv_input = sta_input;
 100         vap->iv_recv_mgmt = sta_recv_mgmt;
 101         vap->iv_recv_ctl = sta_recv_ctl;
 102         vap->iv_opdetach = sta_vdetach;
 103         vap->iv_bmiss = sta_beacon_miss;
 104 }
 105
 106 /*
 107  * Handle a beacon miss event.  The common code filters out
 108  * spurious events that can happen when scanning and/or before
 109  * reaching RUN state.
 110  */
 111 static void
 112 sta_beacon_miss(struct ieee80211vap *vap)
 113 {
 114         struct ieee80211com *ic = vap->iv_ic;
 115
 116         IEEE80211_LOCK_ASSERT(ic);
 117
 118         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 119         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 120             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 121
 122         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 123             "beacon miss, mode %s state %s\n",
 124             ieee80211_opmode_name[vap->iv_opmode],
 125             ieee80211_state_name[vap->iv_state]);
 126
 127         if (vap->iv_state == IEEE80211_S_CSA) {
 128                 /*
 129                  * A Channel Switch is pending; assume we missed the
 130                  * beacon that would've completed the process and just
 131                  * force the switch.  If we made a mistake we'll not
 132                  * find the AP on the new channel and fall back to a
 133                  * normal scan.
 134                  */
 135                 ieee80211_csa_completeswitch(ic);
 136                 return;
 137         }
 138         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 139                 /*
 140                  * Send a directed probe req before falling back to a
 141                  * scan; if we receive a response ic_bmiss_count will
 142                  * be reset.  Some cards mistakenly report beacon miss
 143                  * so this avoids the expensive scan if the ap is
 144                  * still there.
 145                  */
 146                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 147                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 148                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 149                 return;
 150         }
 151
 152         callout_stop(&vap->iv_swbmiss);
 153         vap->iv_bmiss_count = 0;
 154         vap->iv_stats.is_beacon_miss++;
 155         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 156 #ifdef IEEE80211_SUPPORT_SUPERG
 157                 struct ieee80211com *ic = vap->iv_ic;
 158
 159                 /*
 160                  * If we receive a beacon miss interrupt when using
 161                  * dynamic turbo, attempt to switch modes before
 162                  * reassociating.
 163                  */
 164                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 165                         ieee80211_dturbo_switch(vap,
 166                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 167 #endif
 168                 /*
 169                  * Try to reassociate before scanning for a new ap.
 170                  */
 171                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 172         } else {
 173                 /*
 174                  * Somebody else is controlling state changes (e.g.
 175                  * a user-mode app) don't do anything that would
 176                  * confuse them; just drop into scan mode so they'll
 177                  * notified of the state change and given control.
 178                  */
 179                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 180         }
 181 }
 182
 183 /*
 184  * Handle deauth with reason.  We retry only for
 185  * the cases where we might succeed.  Otherwise
 186  * we downgrade the ap and scan.
 187  */
 188 static void
 189 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 190 {
 191         switch (reason) {
 192         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 193         case IEEE80211_STATUS_TIMEOUT:
 194         case IEEE80211_REASON_ASSOC_EXPIRE:
 195         case IEEE80211_REASON_NOT_AUTHED:
 196         case IEEE80211_REASON_NOT_ASSOCED:
 197         case IEEE80211_REASON_ASSOC_LEAVE:
 198         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 199                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 200                 break;
 201         default:
 202                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 203                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 204                         ieee80211_check_scan_current(vap);
 205                 break;
 206         }
 207 }
 208
 209 static void
 210 sta_swbmiss_start(struct ieee80211vap *vap)
 211 {
 212
 213         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
 214                 /*
 215                  * Start s/w beacon miss timer for devices w/o
 216                  * hardware support.  We fudge a bit here since
 217                  * we're doing this in software.
 218                  */
 219                 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 220                     2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
 221                 vap->iv_swbmiss_count = 0;
 222                 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 223                     ieee80211_swbmiss, vap);
 224         }
 225 }
 226
 227 /*
 228  * IEEE80211_M_STA vap state machine handler.
 229  * This routine handles the main states in the 802.11 protocol.
 230  */
 231 static int
 232 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 233 {
 234         struct ieee80211com *ic = vap->iv_ic;
 235         struct ieee80211_node *ni;
 236         enum ieee80211_state ostate;
 237
 238         IEEE80211_LOCK_ASSERT(ic);
 239
 240         ostate = vap->iv_state;
 241         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 242             __func__, ieee80211_state_name[ostate],
 243             ieee80211_state_name[nstate], arg);
 244         vap->iv_state = nstate;                 /* state transition */
 245         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 246         if (ostate != IEEE80211_S_SCAN)
 247                 ieee80211_cancel_scan(vap);     /* background scan */
 248         ni = vap->iv_bss;                       /* NB: no reference held */
 249         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 250                 callout_stop(&vap->iv_swbmiss);
 251         switch (nstate) {
 252         case IEEE80211_S_INIT:
 253                 switch (ostate) {
 254                 case IEEE80211_S_SLEEP:
 255                         /* XXX wakeup */
 256                         /* XXX driver hook to wakeup the hardware? */
 257                 case IEEE80211_S_RUN:
 258                         IEEE80211_SEND_MGMT(ni,
 259                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 260                             IEEE80211_REASON_ASSOC_LEAVE);
 261                         ieee80211_sta_leave(ni);
 262                         break;
 263                 case IEEE80211_S_ASSOC:
 264                         IEEE80211_SEND_MGMT(ni,
 265                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 266                             IEEE80211_REASON_AUTH_LEAVE);
 267                         break;
 268                 case IEEE80211_S_SCAN:
 269                         ieee80211_cancel_scan(vap);
 270                         break;
 271                 default:
 272                         break;
 273                 }
 274                 if (ostate != IEEE80211_S_INIT) {
 275                         /* NB: optimize INIT -> INIT case */
 276                         ieee80211_reset_bss(vap);
 277                 }
 278                 if (vap->iv_auth->ia_detach != NULL)
 279                         vap->iv_auth->ia_detach(vap);
 280                 break;
 281         case IEEE80211_S_SCAN:
 282                 switch (ostate) {
 283                 case IEEE80211_S_INIT:
 284                         /*
 285                          * Initiate a scan.  We can come here as a result
 286                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 287                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 288                          * and the scan request parameters will be present
 289                          * in iv_scanreq.  Otherwise we do the default.
 290                          */
 291                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 292                                 ieee80211_check_scan(vap,
 293                                     vap->iv_scanreq_flags,
 294                                     vap->iv_scanreq_duration,
 295                                     vap->iv_scanreq_mindwell,
 296                                     vap->iv_scanreq_maxdwell,
 297                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 298                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 299                         } else
 300                                 ieee80211_check_scan_current(vap);
 301                         break;
 302                 case IEEE80211_S_SCAN:
 303                 case IEEE80211_S_AUTH:
 304                 case IEEE80211_S_ASSOC:
 305                         /*
 306                          * These can happen either because of a timeout
 307                          * on an assoc/auth response or because of a
 308                          * change in state that requires a reset.  For
 309                          * the former we're called with a non-zero arg
 310                          * that is the cause for the failure; pass this
 311                          * to the scan code so it can update state.
 312                          * Otherwise trigger a new scan unless we're in
 313                          * manual roaming mode in which case an application
 314                          * must issue an explicit scan request.
 315                          */
 316                         if (arg != 0)
 317                                 ieee80211_scan_assoc_fail(vap,
 318                                         vap->iv_bss->ni_macaddr, arg);
 319                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 320                                 ieee80211_check_scan_current(vap);
 321                         break;
 322                 case IEEE80211_S_SLEEP:         /* beacon miss */
 323                         /*
 324                          * XXX if in sleep we need to wakeup the hardware.
 325                          */
 326                         /* FALLTHROUGH */
 327                 case IEEE80211_S_RUN:           /* beacon miss */
 328                         /*
 329                          * Beacon miss.  Notify user space and if not
 330                          * under control of a user application (roaming
 331                          * manual) kick off a scan to re-connect.
 332                          */
 333
 334                         ieee80211_sta_leave(ni);
 335                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 336                                 ieee80211_check_scan_current(vap);
 337                         break;
 338                 default:
 339                         goto invalid;
 340                 }
 341                 break;
 342         case IEEE80211_S_AUTH:
 343                 switch (ostate) {
 344                 case IEEE80211_S_INIT:
 345                 case IEEE80211_S_SCAN:
 346                         IEEE80211_SEND_MGMT(ni,
 347                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 348                         break;
 349                 case IEEE80211_S_AUTH:
 350                 case IEEE80211_S_ASSOC:
 351                         switch (arg & 0xff) {
 352                         case IEEE80211_FC0_SUBTYPE_AUTH:
 353                                 /* ??? */
 354                                 IEEE80211_SEND_MGMT(ni,
 355                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 356                                 break;
 357                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 358                                 sta_authretry(vap, ni, arg>>8);
 359                                 break;
 360                         }
 361                         break;
 362                 case IEEE80211_S_SLEEP:
 363                 case IEEE80211_S_RUN:
 364                         switch (arg & 0xff) {
 365                         case IEEE80211_FC0_SUBTYPE_AUTH:
 366                                 IEEE80211_SEND_MGMT(ni,
 367                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 368                                 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
 369                                 break;
 370                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 371                                 ieee80211_sta_leave(ni);
 372                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 373                                         /* try to reauth */
 374                                         IEEE80211_SEND_MGMT(ni,
 375                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 376                                 }
 377                                 break;
 378                         }
 379                         break;
 380                 default:
 381                         goto invalid;
 382                 }
 383                 break;
 384         case IEEE80211_S_ASSOC:
 385                 switch (ostate) {
 386                 case IEEE80211_S_AUTH:
 387                 case IEEE80211_S_ASSOC:
 388                         IEEE80211_SEND_MGMT(ni,
 389                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 390                         break;
 391                 case IEEE80211_S_SLEEP:         /* cannot happen */
 392                 case IEEE80211_S_RUN:
 393                         ieee80211_sta_leave(ni);
 394                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 395                                 IEEE80211_SEND_MGMT(ni, arg ?
 396                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 397                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 398                         }
 399                         break;
 400                 default:
 401                         goto invalid;
 402                 }
 403                 break;
 404         case IEEE80211_S_RUN:
 405                 if (vap->iv_flags & IEEE80211_F_WPA) {
 406                         /* XXX validate prerequisites */
 407                 }
 408                 switch (ostate) {
 409                 case IEEE80211_S_RUN:
 410                 case IEEE80211_S_CSA:
 411                         break;
 412                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 413                 case IEEE80211_S_ASSOC:
 414 #ifdef IEEE80211_DEBUG
 415                         if (ieee80211_msg_debug(vap)) {
 416                                 ieee80211_note(vap, "%s with %s ssid ",
 417                                     (vap->iv_opmode == IEEE80211_M_STA ?
 418                                     "associated" : "synchronized"),
 419                                     ether_sprintf(ni->ni_bssid));
 420                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 421                                     ni->ni_esslen);
 422                                 /* XXX MCS/HT */
 423                                 printf(" channel %d start %uMb\n",
 424                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 425                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 426                         }
 427 #endif
 428                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 429                         ieee80211_notify_node_join(ni,
 430                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 431                         break;
 432                 case IEEE80211_S_SLEEP:
 433                         /* Wake up from sleep */
 434                         vap->iv_sta_ps(vap, 0);
 435                         break;
 436                 default:
 437                         goto invalid;
 438                 }
 439                 ieee80211_sync_curchan(ic);
 440                 if (ostate != IEEE80211_S_RUN)
 441                         sta_swbmiss_start(vap);
 442                 /*
 443                  * When 802.1x is not in use mark the port authorized
 444                  * at this point so traffic can flow.
 445                  */
 446                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 447                         ieee80211_node_authorize(ni);
 448                 /*
 449                  * Fake association when joining an existing bss.
 450                  *
 451                  * Don't do this if we're doing SLEEP->RUN.
 452                  */
 453                 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
 454                         ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
 455                 break;
 456         case IEEE80211_S_CSA:
 457                 if (ostate != IEEE80211_S_RUN)
 458                         goto invalid;
 459                 break;
 460         case IEEE80211_S_SLEEP:
 461                 sta_swbmiss_start(vap);
 462                 vap->iv_sta_ps(vap, 1);
 463                 break;
 464         default:
 465         invalid:
 466                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 467                     "%s: unexpected state transition %s -> %s\n", __func__,
 468                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 469                 break;
 470         }
 471         return 0;
 472 }
 473
 474 /*
 475  * Return non-zero if the frame is an echo of a multicast
 476  * frame sent by ourself.  The dir is known to be DSTODS.
 477  */
 478 static __inline int
 479 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 480 {
 481 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 482 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 483         const uint8_t *sa;
 484
 485         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 486
 487         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 488                 return 0;
 489         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 490         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 491 #undef WH4
 492 #undef QWH4
 493 }
 494
 495 /*
 496  * Return non-zero if the frame is an echo of a multicast
 497  * frame sent by ourself.  The dir is known to be FROMDS.
 498  */
 499 static __inline int
 500 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 501 {
 502         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 503
 504         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 505                 return 0;
 506         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 507 }
 508
 509 /*
 510  * Decide if a received management frame should be
 511  * printed when debugging is enabled.  This filters some
 512  * of the less interesting frames that come frequently
 513  * (e.g. beacons).
 514  */
 515 static __inline int
 516 doprint(struct ieee80211vap *vap, int subtype)
 517 {
 518         switch (subtype) {
 519         case IEEE80211_FC0_SUBTYPE_BEACON:
 520                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 521         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 522                 return 0;
 523         }
 524         return 1;
 525 }
 526
 527 /*
 528  * Process a received frame.  The node associated with the sender
 529  * should be supplied.  If nothing was found in the node table then
 530  * the caller is assumed to supply a reference to iv_bss instead.
 531  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 532  * during AP scanning to select a AP to associate with; it can have
 533  * any units so long as values have consistent units and higher values
 534  * mean ``better signal''.  The receive timestamp is currently not used
 535  * by the 802.11 layer.
 536  */
 537 static int
 538 sta_input(struct ieee80211_node *ni, struct mbuf *m,
 539     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 540 {
 541         struct ieee80211vap *vap = ni->ni_vap;
 542         struct ieee80211com *ic = ni->ni_ic;
 543         struct ifnet *ifp = vap->iv_ifp;
 544         struct ieee80211_frame *wh;
 545         struct ieee80211_key *key;
 546         struct ether_header *eh;
 547         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 548         uint8_t dir, type, subtype, qos;
 549         uint8_t *bssid;
 550
 551         if (m->m_flags & M_AMPDU_MPDU) {
 552                 /*
 553                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 554                  * w/ M_AMPDU_MPDU marked have already passed through
 555                  * here but were received out of order and been held on
 556                  * the reorder queue.  When resubmitted they are marked
 557                  * with the M_AMPDU_MPDU flag and we can bypass most of
 558                  * the normal processing.
 559                  */
 560                 wh = mtod(m, struct ieee80211_frame *);
 561                 type = IEEE80211_FC0_TYPE_DATA;
 562                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 563                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 564                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 565                 goto resubmit_ampdu;
 566         }
 567
 568         KASSERT(ni != NULL, ("null node"));
 569         ni->ni_inact = ni->ni_inact_reload;
 570
 571         type = -1;                      /* undefined */
 572
 573         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 574                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 575                     ni->ni_macaddr, NULL,
 576                     "too short (1): len %u", m->m_pkthdr.len);
 577                 vap->iv_stats.is_rx_tooshort++;
 578                 goto out;
 579         }
 580         /*
 581          * Bit of a cheat here, we use a pointer for a 3-address
 582          * frame format but don't reference fields past outside
 583          * ieee80211_frame_min w/o first validating the data is
 584          * present.
 585          */
 586         wh = mtod(m, struct ieee80211_frame *);
 587
 588         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 589             IEEE80211_FC0_VERSION_0) {
 590                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 591                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 592                     wh->i_fc[0], wh->i_fc[1]);
 593                 vap->iv_stats.is_rx_badversion++;
 594                 goto err;
 595         }
 596
 597         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 598         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 599         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 600         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 601                 bssid = wh->i_addr2;
 602                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 603                         /* not interested in */
 604                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 605                             bssid, NULL, "%s", "not to bss");
 606                         vap->iv_stats.is_rx_wrongbss++;
 607                         goto out;
 608                 }
 609
 610                 /*
 611                  * Some devices may be in a promiscuous mode
 612                  * where they receive frames for multiple station
 613                  * addresses.
 614                  *
 615                  * If we receive a data frame that isn't
 616                  * destined to our VAP MAC, drop it.
 617                  *
 618                  * XXX TODO: This is only enforced when not scanning;
 619                  * XXX it assumes a software-driven scan will put the NIC
 620                  * XXX into a "no data frames" mode before setting this
 621                  * XXX flag. Otherwise it may be possible that we'll still
 622                  * XXX process data frames whilst scanning.
 623                  */
 624                 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
 625                     && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
 626                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 627                             bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
 628                             IF_LLADDR(ifp), ":", wh->i_addr1, ":");
 629                         vap->iv_stats.is_rx_wrongbss++;
 630                         goto out;
 631                 }
 632
 633                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 634                 ni->ni_noise = nf;
 635                 if ( IEEE80211_HAS_SEQ(type, subtype) &&
 636                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 637                         uint8_t tid = ieee80211_gettid(wh);
 638                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 639                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 640                                 ic->ic_wme.wme_hipri_traffic++;
 641                         if (! ieee80211_check_rxseq(ni, wh, bssid))
 642                                 goto out;
 643                 }
 644         }
 645
 646         switch (type) {
 647         case IEEE80211_FC0_TYPE_DATA:
 648                 hdrspace = ieee80211_hdrspace(ic, wh);
 649                 if (m->m_len < hdrspace &&
 650                     (m = m_pullup(m, hdrspace)) == NULL) {
 651                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 652                             ni->ni_macaddr, NULL,
 653                             "data too short: expecting %u", hdrspace);
 654                         vap->iv_stats.is_rx_tooshort++;
 655                         goto out;               /* XXX */
 656                 }
 657                 /*
 658                  * Handle A-MPDU re-ordering.  If the frame is to be
 659                  * processed directly then ieee80211_ampdu_reorder
 660                  * will return 0; otherwise it has consumed the mbuf
 661                  * and we should do nothing more with it.
 662                  */
 663                 if ((m->m_flags & M_AMPDU) &&
 664                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 665                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 666                     ieee80211_ampdu_reorder(ni, m) != 0) {
 667                         m = NULL;
 668                         goto out;
 669                 }
 670         resubmit_ampdu:
 671                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 672                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 673                             isfromds_mcastecho(vap, wh)) {
 674                                 /*
 675                                  * In IEEE802.11 network, multicast
 676                                  * packets sent from "me" are broadcast
 677                                  * from the AP; silently discard for
 678                                  * SIMPLEX interface.
 679                                  */
 680                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 681                                     wh, "data", "%s", "multicast echo");
 682                                 vap->iv_stats.is_rx_mcastecho++;
 683                                 goto out;
 684                         }
 685                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 686                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 687                                 /*
 688                                  * DWDS sta's must drop 3-address mcast frames
 689                                  * as they will be sent separately as a 4-addr
 690                                  * frame.  Accepting the 3-addr frame will
 691                                  * confuse the bridge into thinking the sending
 692                                  * sta is located at the end of WDS link.
 693                                  */
 694                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 695                                     "3-address data", "%s", "DWDS enabled");
 696                                 vap->iv_stats.is_rx_mcastecho++;
 697                                 goto out;
 698                         }
 699                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 700                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 701                                 IEEE80211_DISCARD(vap,
 702                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 703                                     "%s", "DWDS not enabled");
 704                                 vap->iv_stats.is_rx_wrongdir++;
 705                                 goto out;
 706                         }
 707                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 708                             isdstods_mcastecho(vap, wh)) {
 709                                 /*
 710                                  * In IEEE802.11 network, multicast
 711                                  * packets sent from "me" are broadcast
 712                                  * from the AP; silently discard for
 713                                  * SIMPLEX interface.
 714                                  */
 715                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 716                                     "4-address data", "%s", "multicast echo");
 717                                 vap->iv_stats.is_rx_mcastecho++;
 718                                 goto out;
 719                         }
 720                 } else {
 721                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 722                             "data", "incorrect dir 0x%x", dir);
 723                         vap->iv_stats.is_rx_wrongdir++;
 724                         goto out;
 725                 }
 726
 727                 /*
 728                  * Handle privacy requirements.  Note that we
 729                  * must not be preempted from here until after
 730                  * we (potentially) call ieee80211_crypto_demic;
 731                  * otherwise we may violate assumptions in the
 732                  * crypto cipher modules used to do delayed update
 733                  * of replay sequence numbers.
 734                  */
 735                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 736                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 737                                 /*
 738                                  * Discard encrypted frames when privacy is off.
 739                                  */
 740                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 741                                     wh, "WEP", "%s", "PRIVACY off");
 742                                 vap->iv_stats.is_rx_noprivacy++;
 743                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 744                                 goto out;
 745                         }
 746                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 747                         if (key == NULL) {
 748                                 /* NB: stats+msgs handled in crypto_decap */
 749                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 750                                 goto out;
 751                         }
 752                         wh = mtod(m, struct ieee80211_frame *);
 753                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 754                 } else {
 755                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 756                         key = NULL;
 757                 }
 758
 759                 /*
 760                  * Save QoS bits for use below--before we strip the header.
 761                  */
 762                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 763                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 764                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 765                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 766                 } else
 767                         qos = 0;
 768
 769                 /*
 770                  * Next up, any fragmentation.
 771                  */
 772                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 773                         m = ieee80211_defrag(ni, m, hdrspace);
 774                         if (m == NULL) {
 775                                 /* Fragment dropped or frame not complete yet */
 776                                 goto out;
 777                         }
 778                 }
 779                 wh = NULL;              /* no longer valid, catch any uses */
 780
 781                 /*
 782                  * Next strip any MSDU crypto bits.
 783                  */
 784                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 785                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 786                             ni->ni_macaddr, "data", "%s", "demic error");
 787                         vap->iv_stats.is_rx_demicfail++;
 788                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 789                         goto out;
 790                 }
 791
 792                 /* copy to listener after decrypt */
 793                 if (ieee80211_radiotap_active_vap(vap))
 794                         ieee80211_radiotap_rx(vap, m);
 795                 need_tap = 0;
 796
 797                 /*
 798                  * Finally, strip the 802.11 header.
 799                  */
 800                 m = ieee80211_decap(vap, m, hdrspace);
 801                 if (m == NULL) {
 802                         /* XXX mask bit to check for both */
 803                         /* don't count Null data frames as errors */
 804                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 805                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 806                                 goto out;
 807                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 808                             ni->ni_macaddr, "data", "%s", "decap error");
 809                         vap->iv_stats.is_rx_decap++;
 810                         IEEE80211_NODE_STAT(ni, rx_decap);
 811                         goto err;
 812                 }
 813                 eh = mtod(m, struct ether_header *);
 814                 if (!ieee80211_node_is_authorized(ni)) {
 815                         /*
 816                          * Deny any non-PAE frames received prior to
 817                          * authorization.  For open/shared-key
 818                          * authentication the port is mark authorized
 819                          * after authentication completes.  For 802.1x
 820                          * the port is not marked authorized by the
 821                          * authenticator until the handshake has completed.
 822                          */
 823                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 824                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 825                                     eh->ether_shost, "data",
 826                                     "unauthorized port: ether type 0x%x len %u",
 827                                     eh->ether_type, m->m_pkthdr.len);
 828                                 vap->iv_stats.is_rx_unauth++;
 829                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 830                                 goto err;
 831                         }
 832                 } else {
 833                         /*
 834                          * When denying unencrypted frames, discard
 835                          * any non-PAE frames received without encryption.
 836                          */
 837                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 838                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 839                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 840                                 /*
 841                                  * Drop unencrypted frames.
 842                                  */
 843                                 vap->iv_stats.is_rx_unencrypted++;
 844                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 845                                 goto out;
 846                         }
 847                 }
 848                 /* XXX require HT? */
 849                 if (qos & IEEE80211_QOS_AMSDU) {
 850                         m = ieee80211_decap_amsdu(ni, m);
 851                         if (m == NULL)
 852                                 return IEEE80211_FC0_TYPE_DATA;
 853                 } else {
 854 #ifdef IEEE80211_SUPPORT_SUPERG
 855                         m = ieee80211_decap_fastframe(vap, ni, m);
 856                         if (m == NULL)
 857                                 return IEEE80211_FC0_TYPE_DATA;
 858 #endif
 859                 }
 860                 ieee80211_deliver_data(vap, ni, m);
 861                 return IEEE80211_FC0_TYPE_DATA;
 862
 863         case IEEE80211_FC0_TYPE_MGT:
 864                 vap->iv_stats.is_rx_mgmt++;
 865                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 866                 if (dir != IEEE80211_FC1_DIR_NODS) {
 867                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 868                             wh, "data", "incorrect dir 0x%x", dir);
 869                         vap->iv_stats.is_rx_wrongdir++;
 870                         goto err;
 871                 }
 872                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 873                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 874                             ni->ni_macaddr, "mgt", "too short: len %u",
 875                             m->m_pkthdr.len);
 876                         vap->iv_stats.is_rx_tooshort++;
 877                         goto out;
 878                 }
 879 #ifdef IEEE80211_DEBUG
 880                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 881                     ieee80211_msg_dumppkts(vap)) {
 882                         if_printf(ifp, "received %s from %s rssi %d\n",
 883                             ieee80211_mgt_subtype_name[subtype >>
 884                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 885                             ether_sprintf(wh->i_addr2), rssi);
 886                 }
 887 #endif
 888                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 889                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 890                                 /*
 891                                  * Only shared key auth frames with a challenge
 892                                  * should be encrypted, discard all others.
 893                                  */
 894                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 895                                     wh, ieee80211_mgt_subtype_name[subtype >>
 896                                         IEEE80211_FC0_SUBTYPE_SHIFT],
 897                                     "%s", "WEP set but not permitted");
 898                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 899                                 goto out;
 900                         }
 901                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 902                                 /*
 903                                  * Discard encrypted frames when privacy is off.
 904                                  */
 905                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 906                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 907                                 vap->iv_stats.is_rx_noprivacy++;
 908                                 goto out;
 909                         }
 910                         hdrspace = ieee80211_hdrspace(ic, wh);
 911                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 912                         if (key == NULL) {
 913                                 /* NB: stats+msgs handled in crypto_decap */
 914                                 goto out;
 915                         }
 916                         wh = mtod(m, struct ieee80211_frame *);
 917                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 918                 }
 919                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 920                 goto out;
 921
 922         case IEEE80211_FC0_TYPE_CTL:
 923                 vap->iv_stats.is_rx_ctl++;
 924                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 925                 vap->iv_recv_ctl(ni, m, subtype);
 926                 goto out;
 927
 928         default:
 929                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 930                     wh, NULL, "bad frame type 0x%x", type);
 931                 /* should not come here */
 932                 break;
 933         }
 934 err:
 935         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 936 out:
 937         if (m != NULL) {
 938                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 939                         ieee80211_radiotap_rx(vap, m);
 940                 m_freem(m);
 941         }
 942         return type;
 943 }
 944
 945 static void
 946 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 947     int rssi, int nf, uint16_t seq, uint16_t status)
 948 {
 949         struct ieee80211vap *vap = ni->ni_vap;
 950
 951         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 952                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 953                     ni->ni_macaddr, "open auth",
 954                     "bad sta auth mode %u", ni->ni_authmode);
 955                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 956                 return;
 957         }
 958         if (vap->iv_state != IEEE80211_S_AUTH ||
 959             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
 960                 vap->iv_stats.is_rx_bad_auth++;
 961                 return;
 962         }
 963         if (status != 0) {
 964                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 965                     ni, "open auth failed (reason %d)", status);
 966                 vap->iv_stats.is_rx_auth_fail++;
 967                 vap->iv_stats.is_rx_authfail_code = status;
 968                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 969                     IEEE80211_SCAN_FAIL_STATUS);
 970         } else
 971                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 972 }
 973
 974 static void
 975 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 976     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 977     uint16_t seq, uint16_t status)
 978 {
 979         struct ieee80211vap *vap = ni->ni_vap;
 980         uint8_t *challenge;
 981         int estatus;
 982
 983         /*
 984          * NB: this can happen as we allow pre-shared key
 985          * authentication to be enabled w/o wep being turned
 986          * on so that configuration of these can be done
 987          * in any order.  It may be better to enforce the
 988          * ordering in which case this check would just be
 989          * for sanity/consistency.
 990          */
 991         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 992                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 993                     ni->ni_macaddr, "shared key auth",
 994                     "%s", " PRIVACY is disabled");
 995                 estatus = IEEE80211_STATUS_ALG;
 996                 goto bad;
 997         }
 998         /*
 999          * Pre-shared key authentication is evil; accept
1000          * it only if explicitly configured (it is supported
1001          * mainly for compatibility with clients like OS X).
1002          */
1003         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1004             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1005                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1006                     ni->ni_macaddr, "shared key auth",
1007                     "bad sta auth mode %u", ni->ni_authmode);
1008                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1009                 estatus = IEEE80211_STATUS_ALG;
1010                 goto bad;
1011         }
1012
1013         challenge = NULL;
1014         if (frm + 1 < efrm) {
1015                 if ((frm[1] + 2) > (efrm - frm)) {
1016                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1017                             ni->ni_macaddr, "shared key auth",
1018                             "ie %d/%d too long",
1019                             frm[0], (frm[1] + 2) - (efrm - frm));
1020                         vap->iv_stats.is_rx_bad_auth++;
1021                         estatus = IEEE80211_STATUS_CHALLENGE;
1022                         goto bad;
1023                 }
1024                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1025                         challenge = frm;
1026                 frm += frm[1] + 2;
1027         }
1028         switch (seq) {
1029         case IEEE80211_AUTH_SHARED_CHALLENGE:
1030         case IEEE80211_AUTH_SHARED_RESPONSE:
1031                 if (challenge == NULL) {
1032                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1033                             ni->ni_macaddr, "shared key auth",
1034                             "%s", "no challenge");
1035                         vap->iv_stats.is_rx_bad_auth++;
1036                         estatus = IEEE80211_STATUS_CHALLENGE;
1037                         goto bad;
1038                 }
1039                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1040                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1041                             ni->ni_macaddr, "shared key auth",
1042                             "bad challenge len %d", challenge[1]);
1043                         vap->iv_stats.is_rx_bad_auth++;
1044                         estatus = IEEE80211_STATUS_CHALLENGE;
1045                         goto bad;
1046                 }
1047         default:
1048                 break;
1049         }
1050         if (vap->iv_state != IEEE80211_S_AUTH)
1051                 return;
1052         switch (seq) {
1053         case IEEE80211_AUTH_SHARED_PASS:
1054                 if (ni->ni_challenge != NULL) {
1055                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1056                         ni->ni_challenge = NULL;
1057                 }
1058                 if (status != 0) {
1059                         IEEE80211_NOTE_FRAME(vap,
1060                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1061                             "shared key auth failed (reason %d)", status);
1062                         vap->iv_stats.is_rx_auth_fail++;
1063                         vap->iv_stats.is_rx_authfail_code = status;
1064                         return;
1065                 }
1066                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1067                 break;
1068         case IEEE80211_AUTH_SHARED_CHALLENGE:
1069                 if (!ieee80211_alloc_challenge(ni))
1070                         return;
1071                 /* XXX could optimize by passing recvd challenge */
1072                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1073                 IEEE80211_SEND_MGMT(ni,
1074                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1075                 break;
1076         default:
1077                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1078                     wh, "shared key auth", "bad seq %d", seq);
1079                 vap->iv_stats.is_rx_bad_auth++;
1080                 return;
1081         }
1082         return;
1083 bad:
1084         /*
1085          * Kick the state machine.  This short-circuits
1086          * using the mgt frame timeout to trigger the
1087          * state transition.
1088          */
1089         if (vap->iv_state == IEEE80211_S_AUTH)
1090                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1091                     IEEE80211_SCAN_FAIL_STATUS);
1092 }
1093
1094 int
1095 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1096         const struct ieee80211_frame *wh)
1097 {
1098 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1099         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1100         u_int len = frm[1], qosinfo;
1101         int i;
1102
1103         if (len < sizeof(struct ieee80211_wme_param)-2) {
1104                 IEEE80211_DISCARD_IE(vap,
1105                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1106                     wh, "WME", "too short, len %u", len);
1107                 return -1;
1108         }
1109         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1110         qosinfo &= WME_QOSINFO_COUNT;
1111         /* XXX do proper check for wraparound */
1112         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1113                 return 0;
1114         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1115         for (i = 0; i < WME_NUM_AC; i++) {
1116                 struct wmeParams *wmep =
1117                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1118                 /* NB: ACI not used */
1119                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1120                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1121                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1122                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1123                 wmep->wmep_txopLimit = LE_READ_2(frm+2);
1124                 frm += 4;
1125         }
1126         wme->wme_wmeChanParams.cap_info = qosinfo;
1127         return 1;
1128 #undef MS
1129 }
1130
1131 /*
1132  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1133  * is the first CSA then initiate the switch.  Otherwise we
1134  * track state and trigger completion and/or cancel of the switch.
1135  * XXX should be public for IBSS use
1136  */
1137 static void
1138 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1139         const struct ieee80211_frame *wh)
1140 {
1141         struct ieee80211com *ic = vap->iv_ic;
1142         const struct ieee80211_csa_ie *csa =
1143             (const struct ieee80211_csa_ie *) frm;
1144
1145         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1146             ("state %s", ieee80211_state_name[vap->iv_state]));
1147
1148         if (csa->csa_mode > 1) {
1149                 IEEE80211_DISCARD_IE(vap,
1150                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1151                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1152                 return;
1153         }
1154         IEEE80211_LOCK(ic);
1155         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1156                 /*
1157                  * Convert the channel number to a channel reference.  We
1158                  * try first to preserve turbo attribute of the current
1159                  * channel then fallback.  Note this will not work if the
1160                  * CSA specifies a channel that requires a band switch (e.g.
1161                  * 11a => 11g).  This is intentional as 11h is defined only
1162                  * for 5GHz/11a and because the switch does not involve a
1163                  * reassociation, protocol state (capabilities, negotated
1164                  * rates, etc) may/will be wrong.
1165                  */
1166                 struct ieee80211_channel *c =
1167                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1168                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1169                 if (c == NULL) {
1170                         c = ieee80211_find_channel_byieee(ic,
1171                             csa->csa_newchan,
1172                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1173                         if (c == NULL) {
1174                                 IEEE80211_DISCARD_IE(vap,
1175                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1176                                     wh, "CSA", "invalid channel %u",
1177                                     csa->csa_newchan);
1178                                 goto done;
1179                         }
1180                 }
1181 #if IEEE80211_CSA_COUNT_MIN > 0
1182                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1183                         /*
1184                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1185                          * reduce the risk of being redirected by a fabricated
1186                          * CSA.  If a valid CSA is dropped we'll still get a
1187                          * beacon miss when the AP leaves the channel so we'll
1188                          * eventually follow to the new channel.
1189                          *
1190                          * NOTE: this violates the 11h spec that states that
1191                          * count may be any value and if 0 then a switch
1192                          * should happen asap.
1193                          */
1194                         IEEE80211_DISCARD_IE(vap,
1195                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1196                             wh, "CSA", "count %u too small, must be >= %u",
1197                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1198                         goto done;
1199                 }
1200 #endif
1201                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1202         } else {
1203                 /*
1204                  * Validate this ie against the initial CSA.  We require
1205                  * mode and channel not change and the count must be
1206                  * monotonically decreasing.  This may be pointless and
1207                  * canceling the switch as a result may be too paranoid but
1208                  * in the worst case if we drop out of CSA because of this
1209                  * and the AP does move then we'll just end up taking a
1210                  * beacon miss and scan to find the AP.
1211                  *
1212                  * XXX may want <= on count as we also process ProbeResp
1213                  * frames and those may come in w/ the same count as the
1214                  * previous beacon; but doing so leaves us open to a stuck
1215                  * count until we add a dead-man timer
1216                  */
1217                 if (!(csa->csa_count < ic->ic_csa_count &&
1218                       csa->csa_mode == ic->ic_csa_mode &&
1219                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1220                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1221                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1222                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1223                             ic->ic_csa_newchan, ic->ic_csa_count,
1224                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1225                         ieee80211_csa_cancelswitch(ic);
1226                 } else {
1227                         if (csa->csa_count <= 1)
1228                                 ieee80211_csa_completeswitch(ic);
1229                         else
1230                                 ic->ic_csa_count = csa->csa_count;
1231                 }
1232         }
1233 done:
1234         IEEE80211_UNLOCK(ic);
1235 }
1236
1237 /*
1238  * Return non-zero if a background scan may be continued:
1239  * o bg scan is active
1240  * o no channel switch is pending
1241  * o there has not been any traffic recently
1242  *
1243  * Note we do not check if there is an administrative enable;
1244  * this is only done to start the scan.  We assume that any
1245  * change in state will be accompanied by a request to cancel
1246  * active scans which will otherwise cause this test to fail.
1247  */
1248 static __inline int
1249 contbgscan(struct ieee80211vap *vap)
1250 {
1251         struct ieee80211com *ic = vap->iv_ic;
1252
1253         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1254             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1255             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1256             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1257 }
1258
1259 /*
1260  * Return non-zero if a backgrond scan may be started:
1261  * o bg scanning is administratively enabled
1262  * o no channel switch is pending
1263  * o we are not boosted on a dynamic turbo channel
1264  * o there has not been a scan recently
1265  * o there has not been any traffic recently
1266  */
1267 static __inline int
1268 startbgscan(struct ieee80211vap *vap)
1269 {
1270         struct ieee80211com *ic = vap->iv_ic;
1271
1272         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1273             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1274 #ifdef IEEE80211_SUPPORT_SUPERG
1275             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1276 #endif
1277             time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1278             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1279 }
1280
1281 static void
1282 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1283     const struct ieee80211_rx_stats *rxs,
1284     int rssi, int nf)
1285 {
1286 #define ISPROBE(_st)    ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1287 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1288         struct ieee80211vap *vap = ni->ni_vap;
1289         struct ieee80211com *ic = ni->ni_ic;
1290         struct ieee80211_channel *rxchan = ic->ic_curchan;
1291         struct ieee80211_frame *wh;
1292         uint8_t *frm, *efrm;
1293         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1294         uint8_t rate;
1295         int ht_state_change = 0;
1296
1297         wh = mtod(m0, struct ieee80211_frame *);
1298         frm = (uint8_t *)&wh[1];
1299         efrm = mtod(m0, uint8_t *) + m0->m_len;
1300         switch (subtype) {
1301         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1302         case IEEE80211_FC0_SUBTYPE_BEACON: {
1303                 struct ieee80211_scanparams scan;
1304                 struct ieee80211_channel *c;
1305                 /*
1306                  * We process beacon/probe response frames:
1307                  *    o when scanning, or
1308                  *    o station mode when associated (to collect state
1309                  *      updates such as 802.11g slot time)
1310                  * Frames otherwise received are discarded.
1311                  */
1312                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1313                         vap->iv_stats.is_rx_mgtdiscard++;
1314                         return;
1315                 }
1316
1317                 /* Override RX channel as appropriate */
1318                 if (rxs != NULL) {
1319                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1320                         if (c != NULL)
1321                                 rxchan = c;
1322                 }
1323
1324                 /* XXX probe response in sta mode when !scanning? */
1325                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1326                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1327                                 vap->iv_stats.is_beacon_bad++;
1328                         return;
1329                 }
1330
1331                 /*
1332                  * Count frame now that we know it's to be processed.
1333                  */
1334                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1335                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1336                         IEEE80211_NODE_STAT(ni, rx_beacons);
1337                 } else
1338                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1339                 /*
1340                  * When operating in station mode, check for state updates.
1341                  * Be careful to ignore beacons received while doing a
1342                  * background scan.  We consider only 11g/WMM stuff right now.
1343                  */
1344                 if (ni->ni_associd != 0 &&
1345                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1346                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1347                         /* record tsf of last beacon */
1348                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1349                                 sizeof(ni->ni_tstamp));
1350                         /* count beacon frame for s/w bmiss handling */
1351                         vap->iv_swbmiss_count++;
1352                         vap->iv_bmiss_count = 0;
1353                         if (ni->ni_erp != scan.erp) {
1354                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1355                                     wh->i_addr2,
1356                                     "erp change: was 0x%x, now 0x%x",
1357                                     ni->ni_erp, scan.erp);
1358                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1359                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1360                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1361                                 else
1362                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1363                                 ni->ni_erp = scan.erp;
1364                                 /* XXX statistic */
1365                                 /* XXX driver notification */
1366                         }
1367                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1368                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1369                                     wh->i_addr2,
1370                                     "capabilities change: was 0x%x, now 0x%x",
1371                                     ni->ni_capinfo, scan.capinfo);
1372                                 /*
1373                                  * NB: we assume short preamble doesn't
1374                                  *     change dynamically
1375                                  */
1376                                 ieee80211_set_shortslottime(ic,
1377                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1378                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1379                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1380                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1381                                 /* XXX statistic */
1382                         }
1383                         if (scan.wme != NULL &&
1384                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1385                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1386                                 ieee80211_wme_updateparams(vap);
1387 #ifdef IEEE80211_SUPPORT_SUPERG
1388                         if (scan.ath != NULL)
1389                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1390 #endif
1391                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1392                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1393                                 /* XXX state changes? */
1394                                 if (ieee80211_ht_updateparams(ni,
1395                                     scan.htcap, scan.htinfo))
1396                                         ht_state_change = 1;
1397                         }
1398                         if (scan.quiet)
1399                                 ic->ic_set_quiet(ni, scan.quiet);
1400
1401                         if (scan.tim != NULL) {
1402                                 struct ieee80211_tim_ie *tim =
1403                                     (struct ieee80211_tim_ie *) scan.tim;
1404                                 /*
1405                                  * XXX Check/debug this code; see if it's about
1406                                  * the right time to force the VAP awake if we
1407                                  * receive a frame destined for us?
1408                                  */
1409                                 int aid = IEEE80211_AID(ni->ni_associd);
1410                                 int ix = aid / NBBY;
1411                                 int min = tim->tim_bitctl &~ 1;
1412                                 int max = tim->tim_len + min - 4;
1413                                 int tim_ucast = 0, tim_mcast = 0;
1414
1415                                 /*
1416                                  * Only do this for unicast traffic in the TIM
1417                                  * The multicast traffic notification for
1418                                  * the scan notification stuff should occur
1419                                  * differently.
1420                                  */
1421                                 if (min <= ix && ix <= max &&
1422                                      isset(tim->tim_bitmap - min, aid)) {
1423                                         tim_ucast = 1;
1424                                 }
1425
1426                                 /*
1427                                  * Do a separate notification
1428                                  * for the multicast bit being set.
1429                                  */
1430                                 if (tim->tim_bitctl & 1) {
1431                                         tim_mcast = 1;
1432                                 }
1433
1434                                 /*
1435                                  * If the TIM indicates there's traffic for
1436                                  * us then get us out of STA mode powersave.
1437                                  */
1438                                 if (tim_ucast == 1) {
1439
1440                                         /*
1441                                          * Wake us out of SLEEP state if we're
1442                                          * in it; and if we're doing bgscan
1443                                          * then wake us out of STA powersave.
1444                                          */
1445                                         ieee80211_sta_tim_notify(vap, 1);
1446
1447                                         /*
1448                                          * This is preventing us from
1449                                          * continuing a bgscan; because it
1450                                          * tricks the contbgscan()
1451                                          * routine to think there's always
1452                                          * traffic for us.
1453                                          *
1454                                          * I think we need both an RX and
1455                                          * TX ic_lastdata field.
1456                                          */
1457                                         ic->ic_lastdata = ticks;
1458                                 }
1459
1460                                 ni->ni_dtim_count = tim->tim_count;
1461                                 ni->ni_dtim_period = tim->tim_period;
1462                         }
1463                         if (scan.csa != NULL &&
1464                             (vap->iv_flags & IEEE80211_F_DOTH))
1465                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1466                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1467                                 /*
1468                                  * No CSA ie or 11h disabled, but a channel
1469                                  * switch is pending; drop out so we aren't
1470                                  * stuck in CSA state.  If the AP really is
1471                                  * moving we'll get a beacon miss and scan.
1472                                  */
1473                                 IEEE80211_LOCK(ic);
1474                                 ieee80211_csa_cancelswitch(ic);
1475                                 IEEE80211_UNLOCK(ic);
1476                         }
1477                         /*
1478                          * If scanning, pass the info to the scan module.
1479                          * Otherwise, check if it's the right time to do
1480                          * a background scan.  Background scanning must
1481                          * be enabled and we must not be operating in the
1482                          * turbo phase of dynamic turbo mode.  Then,
1483                          * it's been a while since the last background
1484                          * scan and if no data frames have come through
1485                          * recently, kick off a scan.  Note that this
1486                          * is the mechanism by which a background scan
1487                          * is started _and_ continued each time we
1488                          * return on-channel to receive a beacon from
1489                          * our ap.
1490                          */
1491                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1492                                 ieee80211_add_scan(vap, rxchan,
1493                                     &scan, wh, subtype, rssi, nf);
1494                         } else if (contbgscan(vap)) {
1495                                 ieee80211_bg_scan(vap, 0);
1496                         } else if (startbgscan(vap)) {
1497                                 vap->iv_stats.is_scan_bg++;
1498 #if 0
1499                                 /* wakeup if we are sleeing */
1500                                 ieee80211_set_pwrsave(vap, 0);
1501 #endif
1502                                 ieee80211_bg_scan(vap, 0);
1503                         }
1504
1505                         /*
1506                          * Put the station to sleep if we haven't seen
1507                          * traffic in a while.
1508                          */
1509                         IEEE80211_LOCK(ic);
1510                         ieee80211_sta_ps_timer_check(vap);
1511                         IEEE80211_UNLOCK(ic);
1512
1513                         /*
1514                          * If we've had a channel width change (eg HT20<->HT40)
1515                          * then schedule a delayed driver notification.
1516                          */
1517                         if (ht_state_change)
1518                                 ieee80211_update_chw(ic);
1519                         return;
1520                 }
1521                 /*
1522                  * If scanning, just pass information to the scan module.
1523                  */
1524                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1525                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1526                                 /*
1527                                  * Actively scanning a channel marked passive;
1528                                  * send a probe request now that we know there
1529                                  * is 802.11 traffic present.
1530                                  *
1531                                  * XXX check if the beacon we recv'd gives
1532                                  * us what we need and suppress the probe req
1533                                  */
1534                                 ieee80211_probe_curchan(vap, 1);
1535                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1536                         }
1537                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1538                             subtype, rssi, nf);
1539                         return;
1540                 }
1541                 break;
1542         }
1543
1544         case IEEE80211_FC0_SUBTYPE_AUTH: {
1545                 uint16_t algo, seq, status;
1546                 /*
1547                  * auth frame format
1548                  *      [2] algorithm
1549                  *      [2] sequence
1550                  *      [2] status
1551                  *      [tlv*] challenge
1552                  */
1553                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1554                 algo   = le16toh(*(uint16_t *)frm);
1555                 seq    = le16toh(*(uint16_t *)(frm + 2));
1556                 status = le16toh(*(uint16_t *)(frm + 4));
1557                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1558                     "recv auth frame with algorithm %d seq %d", algo, seq);
1559
1560                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1561                         IEEE80211_DISCARD(vap,
1562                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1563                             wh, "auth", "%s", "TKIP countermeasures enabled");
1564                         vap->iv_stats.is_rx_auth_countermeasures++;
1565                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1566                                 ieee80211_send_error(ni, wh->i_addr2,
1567                                         IEEE80211_FC0_SUBTYPE_AUTH,
1568                                         IEEE80211_REASON_MIC_FAILURE);
1569                         }
1570                         return;
1571                 }
1572                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1573                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1574                             seq, status);
1575                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1576                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1577                 else {
1578                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1579                             wh, "auth", "unsupported alg %d", algo);
1580                         vap->iv_stats.is_rx_auth_unsupported++;
1581                         return;
1582                 }
1583                 break;
1584         }
1585
1586         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1587         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1588                 uint16_t capinfo, associd;
1589                 uint16_t status;
1590
1591                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1592                         vap->iv_stats.is_rx_mgtdiscard++;
1593                         return;
1594                 }
1595
1596                 /*
1597                  * asresp frame format
1598                  *      [2] capability information
1599                  *      [2] status
1600                  *      [2] association ID
1601                  *      [tlv] supported rates
1602                  *      [tlv] extended supported rates
1603                  *      [tlv] WME
1604                  *      [tlv] HT capabilities
1605                  *      [tlv] HT info
1606                  */
1607                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1608                 ni = vap->iv_bss;
1609                 capinfo = le16toh(*(uint16_t *)frm);
1610                 frm += 2;
1611                 status = le16toh(*(uint16_t *)frm);
1612                 frm += 2;
1613                 if (status != 0) {
1614                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1615                             wh->i_addr2, "%sassoc failed (reason %d)",
1616                             ISREASSOC(subtype) ?  "re" : "", status);
1617                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1618                         return;
1619                 }
1620                 associd = le16toh(*(uint16_t *)frm);
1621                 frm += 2;
1622
1623                 rates = xrates = wme = htcap = htinfo = NULL;
1624                 while (efrm - frm > 1) {
1625                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1626                         switch (*frm) {
1627                         case IEEE80211_ELEMID_RATES:
1628                                 rates = frm;
1629                                 break;
1630                         case IEEE80211_ELEMID_XRATES:
1631                                 xrates = frm;
1632                                 break;
1633                         case IEEE80211_ELEMID_HTCAP:
1634                                 htcap = frm;
1635                                 break;
1636                         case IEEE80211_ELEMID_HTINFO:
1637                                 htinfo = frm;
1638                                 break;
1639                         case IEEE80211_ELEMID_VENDOR:
1640                                 if (iswmeoui(frm))
1641                                         wme = frm;
1642                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1643                                         /*
1644                                          * Accept pre-draft HT ie's if the
1645                                          * standard ones have not been seen.
1646                                          */
1647                                         if (ishtcapoui(frm)) {
1648                                                 if (htcap == NULL)
1649                                                         htcap = frm;
1650                                         } else if (ishtinfooui(frm)) {
1651                                                 if (htinfo == NULL)
1652                                                         htinfo = frm;
1653                                         }
1654                                 }
1655                                 /* XXX Atheros OUI support */
1656                                 break;
1657                         }
1658                         frm += frm[1] + 2;
1659                 }
1660
1661                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1662                 if (xrates != NULL)
1663                         IEEE80211_VERIFY_ELEMENT(xrates,
1664                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1665                 rate = ieee80211_setup_rates(ni, rates, xrates,
1666                                 IEEE80211_F_JOIN |
1667                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1668                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1669                 if (rate & IEEE80211_RATE_BASIC) {
1670                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1671                             wh->i_addr2,
1672                             "%sassoc failed (rate set mismatch)",
1673                             ISREASSOC(subtype) ?  "re" : "");
1674                         vap->iv_stats.is_rx_assoc_norate++;
1675                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1676                             IEEE80211_SCAN_FAIL_STATUS);
1677                         return;
1678                 }
1679
1680                 ni->ni_capinfo = capinfo;
1681                 ni->ni_associd = associd;
1682                 if (ni->ni_jointime == 0)
1683                         ni->ni_jointime = time_uptime;
1684                 if (wme != NULL &&
1685                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1686                         ni->ni_flags |= IEEE80211_NODE_QOS;
1687                         ieee80211_wme_updateparams(vap);
1688                 } else
1689                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1690                 /*
1691                  * Setup HT state according to the negotiation.
1692                  *
1693                  * NB: shouldn't need to check if HT use is enabled but some
1694                  *     ap's send back HT ie's even when we don't indicate we
1695                  *     are HT capable in our AssocReq.
1696                  */
1697                 if (htcap != NULL && htinfo != NULL &&
1698                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1699                         ieee80211_ht_node_init(ni);
1700                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1701                         ieee80211_setup_htrates(ni, htcap,
1702                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1703                         ieee80211_setup_basic_htrates(ni, htinfo);
1704                         ieee80211_node_setuptxparms(ni);
1705                         ieee80211_ratectl_node_init(ni);
1706                 } else {
1707 #ifdef IEEE80211_SUPPORT_SUPERG
1708                         if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1709                                 ieee80211_ff_node_init(ni);
1710 #endif
1711                 }
1712                 /*
1713                  * Configure state now that we are associated.
1714                  *
1715                  * XXX may need different/additional driver callbacks?
1716                  */
1717                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1718                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1719                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1720                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1721                 } else {
1722                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1723                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1724                 }
1725                 ieee80211_set_shortslottime(ic,
1726                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1727                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1728                 /*
1729                  * Honor ERP protection.
1730                  *
1731                  * NB: ni_erp should zero for non-11g operation.
1732                  */
1733                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1734                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1735                         ic->ic_flags |= IEEE80211_F_USEPROT;
1736                 else
1737                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1738                 IEEE80211_NOTE_MAC(vap,
1739                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1740                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1741                     ISREASSOC(subtype) ? "re" : "",
1742                     IEEE80211_NODE_AID(ni),
1743                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1744                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1745                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1746                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1747                     ni->ni_flags & IEEE80211_NODE_HT ?
1748                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1749                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1750                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1751                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1752                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1753                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1754                         ", fast-frames" : "",
1755                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1756                         ", turbo" : ""
1757                 );
1758                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1759                 break;
1760         }
1761
1762         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1763                 uint16_t reason;
1764
1765                 if (vap->iv_state == IEEE80211_S_SCAN) {
1766                         vap->iv_stats.is_rx_mgtdiscard++;
1767                         return;
1768                 }
1769                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1770                         /* NB: can happen when in promiscuous mode */
1771                         vap->iv_stats.is_rx_mgtdiscard++;
1772                         break;
1773                 }
1774
1775                 /*
1776                  * deauth frame format
1777                  *      [2] reason
1778                  */
1779                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1780                 reason = le16toh(*(uint16_t *)frm);
1781
1782                 vap->iv_stats.is_rx_deauth++;
1783                 vap->iv_stats.is_rx_deauth_code = reason;
1784                 IEEE80211_NODE_STAT(ni, rx_deauth);
1785
1786                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1787                     "recv deauthenticate (reason %d)", reason);
1788                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1789                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1790                 break;
1791         }
1792
1793         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1794                 uint16_t reason;
1795
1796                 if (vap->iv_state != IEEE80211_S_RUN &&
1797                     vap->iv_state != IEEE80211_S_ASSOC &&
1798                     vap->iv_state != IEEE80211_S_AUTH) {
1799                         vap->iv_stats.is_rx_mgtdiscard++;
1800                         return;
1801                 }
1802                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1803                         /* NB: can happen when in promiscuous mode */
1804                         vap->iv_stats.is_rx_mgtdiscard++;
1805                         break;
1806                 }
1807
1808                 /*
1809                  * disassoc frame format
1810                  *      [2] reason
1811                  */
1812                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1813                 reason = le16toh(*(uint16_t *)frm);
1814
1815                 vap->iv_stats.is_rx_disassoc++;
1816                 vap->iv_stats.is_rx_disassoc_code = reason;
1817                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1818
1819                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1820                     "recv disassociate (reason %d)", reason);
1821                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1822                 break;
1823         }
1824
1825         case IEEE80211_FC0_SUBTYPE_ACTION:
1826         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1827                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1828                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1829                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1830                             wh, NULL, "%s", "not for us");
1831                         vap->iv_stats.is_rx_mgtdiscard++;
1832                 } else if (vap->iv_state != IEEE80211_S_RUN) {
1833                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1834                             wh, NULL, "wrong state %s",
1835                             ieee80211_state_name[vap->iv_state]);
1836                         vap->iv_stats.is_rx_mgtdiscard++;
1837                 } else {
1838                         if (ieee80211_parse_action(ni, m0) == 0)
1839                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1840                 }
1841                 break;
1842
1843         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1844         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1845         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1846         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1847         case IEEE80211_FC0_SUBTYPE_ATIM:
1848                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1849                     wh, NULL, "%s", "not handled");
1850                 vap->iv_stats.is_rx_mgtdiscard++;
1851                 break;
1852
1853         default:
1854                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1855                     wh, "mgt", "subtype 0x%x not handled", subtype);
1856                 vap->iv_stats.is_rx_badsubtype++;
1857                 break;
1858         }
1859 #undef ISREASSOC
1860 #undef ISPROBE
1861 }
1862
1863 static void
1864 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1865 {
1866         switch (subtype) {
1867         case IEEE80211_FC0_SUBTYPE_BAR:
1868                 ieee80211_recv_bar(ni, m);
1869                 break;
1870         }
1871 }