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 #include <net80211/ieee80211_vht.h>
  68
  69 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  70
  71 static  void sta_vattach(struct ieee80211vap *);
  72 static  void sta_beacon_miss(struct ieee80211vap *);
  73 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  74 static  int sta_input(struct ieee80211_node *, struct mbuf *,
  75             const struct ieee80211_rx_stats *, int, int);
  76 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  77             int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
  78 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  79
  80 void
  81 ieee80211_sta_attach(struct ieee80211com *ic)
  82 {
  83         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  84 }
  85
  86 void
  87 ieee80211_sta_detach(struct ieee80211com *ic)
  88 {
  89 }
  90
  91 static void
  92 sta_vdetach(struct ieee80211vap *vap)
  93 {
  94 }
  95
  96 static void
  97 sta_vattach(struct ieee80211vap *vap)
  98 {
  99         vap->iv_newstate = sta_newstate;
 100         vap->iv_input = sta_input;
 101         vap->iv_recv_mgmt = sta_recv_mgmt;
 102         vap->iv_recv_ctl = sta_recv_ctl;
 103         vap->iv_opdetach = sta_vdetach;
 104         vap->iv_bmiss = sta_beacon_miss;
 105 }
 106
 107 /*
 108  * Handle a beacon miss event.  The common code filters out
 109  * spurious events that can happen when scanning and/or before
 110  * reaching RUN state.
 111  */
 112 static void
 113 sta_beacon_miss(struct ieee80211vap *vap)
 114 {
 115         struct ieee80211com *ic = vap->iv_ic;
 116
 117         IEEE80211_LOCK_ASSERT(ic);
 118
 119         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 120         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 121             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 122
 123         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 124             "beacon miss, mode %s state %s\n",
 125             ieee80211_opmode_name[vap->iv_opmode],
 126             ieee80211_state_name[vap->iv_state]);
 127
 128         if (vap->iv_state == IEEE80211_S_CSA) {
 129                 /*
 130                  * A Channel Switch is pending; assume we missed the
 131                  * beacon that would've completed the process and just
 132                  * force the switch.  If we made a mistake we'll not
 133                  * find the AP on the new channel and fall back to a
 134                  * normal scan.
 135                  */
 136                 ieee80211_csa_completeswitch(ic);
 137                 return;
 138         }
 139         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 140                 /*
 141                  * Send a directed probe req before falling back to a
 142                  * scan; if we receive a response ic_bmiss_count will
 143                  * be reset.  Some cards mistakenly report beacon miss
 144                  * so this avoids the expensive scan if the ap is
 145                  * still there.
 146                  */
 147                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 148                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 149                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 150                 return;
 151         }
 152
 153         callout_stop(&vap->iv_swbmiss);
 154         vap->iv_bmiss_count = 0;
 155         vap->iv_stats.is_beacon_miss++;
 156         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 157 #ifdef IEEE80211_SUPPORT_SUPERG
 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         int is_hw_decrypted = 0;
 551         int has_decrypted = 0;
 552
 553         /*
 554          * Some devices do hardware decryption all the way through
 555          * to pretending the frame wasn't encrypted in the first place.
 556          * So, tag it appropriately so it isn't discarded inappropriately.
 557          */
 558         if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
 559                 is_hw_decrypted = 1;
 560
 561         if (m->m_flags & M_AMPDU_MPDU) {
 562                 /*
 563                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 564                  * w/ M_AMPDU_MPDU marked have already passed through
 565                  * here but were received out of order and been held on
 566                  * the reorder queue.  When resubmitted they are marked
 567                  * with the M_AMPDU_MPDU flag and we can bypass most of
 568                  * the normal processing.
 569                  */
 570                 wh = mtod(m, struct ieee80211_frame *);
 571                 type = IEEE80211_FC0_TYPE_DATA;
 572                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 573                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 574                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 575                 goto resubmit_ampdu;
 576         }
 577
 578         KASSERT(ni != NULL, ("null node"));
 579         ni->ni_inact = ni->ni_inact_reload;
 580
 581         type = -1;                      /* undefined */
 582
 583         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 584                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 585                     ni->ni_macaddr, NULL,
 586                     "too short (1): len %u", m->m_pkthdr.len);
 587                 vap->iv_stats.is_rx_tooshort++;
 588                 goto out;
 589         }
 590         /*
 591          * Bit of a cheat here, we use a pointer for a 3-address
 592          * frame format but don't reference fields past outside
 593          * ieee80211_frame_min w/o first validating the data is
 594          * present.
 595          */
 596         wh = mtod(m, struct ieee80211_frame *);
 597
 598         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 599             IEEE80211_FC0_VERSION_0) {
 600                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 601                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 602                     wh->i_fc[0], wh->i_fc[1]);
 603                 vap->iv_stats.is_rx_badversion++;
 604                 goto err;
 605         }
 606
 607         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 608         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 609         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 610         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 611                 bssid = wh->i_addr2;
 612                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 613                         /* not interested in */
 614                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 615                             bssid, NULL, "%s", "not to bss");
 616                         vap->iv_stats.is_rx_wrongbss++;
 617                         goto out;
 618                 }
 619
 620                 /*
 621                  * Some devices may be in a promiscuous mode
 622                  * where they receive frames for multiple station
 623                  * addresses.
 624                  *
 625                  * If we receive a data frame that isn't
 626                  * destined to our VAP MAC, drop it.
 627                  *
 628                  * XXX TODO: This is only enforced when not scanning;
 629                  * XXX it assumes a software-driven scan will put the NIC
 630                  * XXX into a "no data frames" mode before setting this
 631                  * XXX flag. Otherwise it may be possible that we'll still
 632                  * XXX process data frames whilst scanning.
 633                  */
 634                 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
 635                     && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
 636                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 637                             bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
 638                             IF_LLADDR(ifp), ":", wh->i_addr1, ":");
 639                         vap->iv_stats.is_rx_wrongbss++;
 640                         goto out;
 641                 }
 642
 643                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 644                 ni->ni_noise = nf;
 645                 if ( IEEE80211_HAS_SEQ(type, subtype) &&
 646                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 647                         uint8_t tid = ieee80211_gettid(wh);
 648                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 649                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 650                                 ic->ic_wme.wme_hipri_traffic++;
 651                         if (! ieee80211_check_rxseq(ni, wh, bssid))
 652                                 goto out;
 653                 }
 654         }
 655
 656         switch (type) {
 657         case IEEE80211_FC0_TYPE_DATA:
 658                 hdrspace = ieee80211_hdrspace(ic, wh);
 659                 if (m->m_len < hdrspace &&
 660                     (m = m_pullup(m, hdrspace)) == NULL) {
 661                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 662                             ni->ni_macaddr, NULL,
 663                             "data too short: expecting %u", hdrspace);
 664                         vap->iv_stats.is_rx_tooshort++;
 665                         goto out;               /* XXX */
 666                 }
 667                 /*
 668                  * Handle A-MPDU re-ordering.  If the frame is to be
 669                  * processed directly then ieee80211_ampdu_reorder
 670                  * will return 0; otherwise it has consumed the mbuf
 671                  * and we should do nothing more with it.
 672                  */
 673                 if ((m->m_flags & M_AMPDU) &&
 674                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 675                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 676                     ieee80211_ampdu_reorder(ni, m) != 0) {
 677                         m = NULL;
 678                         goto out;
 679                 }
 680         resubmit_ampdu:
 681                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 682                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 683                             isfromds_mcastecho(vap, wh)) {
 684                                 /*
 685                                  * In IEEE802.11 network, multicast
 686                                  * packets sent from "me" are broadcast
 687                                  * from the AP; silently discard for
 688                                  * SIMPLEX interface.
 689                                  */
 690                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 691                                     wh, "data", "%s", "multicast echo");
 692                                 vap->iv_stats.is_rx_mcastecho++;
 693                                 goto out;
 694                         }
 695                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 696                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 697                                 /*
 698                                  * DWDS sta's must drop 3-address mcast frames
 699                                  * as they will be sent separately as a 4-addr
 700                                  * frame.  Accepting the 3-addr frame will
 701                                  * confuse the bridge into thinking the sending
 702                                  * sta is located at the end of WDS link.
 703                                  */
 704                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 705                                     "3-address data", "%s", "DWDS enabled");
 706                                 vap->iv_stats.is_rx_mcastecho++;
 707                                 goto out;
 708                         }
 709                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 710                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 711                                 IEEE80211_DISCARD(vap,
 712                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 713                                     "%s", "DWDS not enabled");
 714                                 vap->iv_stats.is_rx_wrongdir++;
 715                                 goto out;
 716                         }
 717                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 718                             isdstods_mcastecho(vap, wh)) {
 719                                 /*
 720                                  * In IEEE802.11 network, multicast
 721                                  * packets sent from "me" are broadcast
 722                                  * from the AP; silently discard for
 723                                  * SIMPLEX interface.
 724                                  */
 725                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 726                                     "4-address data", "%s", "multicast echo");
 727                                 vap->iv_stats.is_rx_mcastecho++;
 728                                 goto out;
 729                         }
 730                 } else {
 731                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 732                             "data", "incorrect dir 0x%x", dir);
 733                         vap->iv_stats.is_rx_wrongdir++;
 734                         goto out;
 735                 }
 736
 737                 /*
 738                  * Handle privacy requirements for hardware decryption
 739                  * devices.
 740                  *
 741                  * For those devices, a handful of things happen.
 742                  *
 743                  * + If IV has been stripped, then we can't run
 744                  *   ieee80211_crypto_decap() - none of the key
 745                  * + If MIC has been stripped, we can't validate
 746                  *   MIC here.
 747                  * + If MIC fails, then we need to communicate a
 748                  *   MIC failure up to the stack - but we don't know
 749                  *   which key was used.
 750                  */
 751
 752                 /*
 753                  * Handle privacy requirements.  Note that we
 754                  * must not be preempted from here until after
 755                  * we (potentially) call ieee80211_crypto_demic;
 756                  * otherwise we may violate assumptions in the
 757                  * crypto cipher modules used to do delayed update
 758                  * of replay sequence numbers.
 759                  */
 760                 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 761                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 762                                 /*
 763                                  * Discard encrypted frames when privacy is off.
 764                                  */
 765                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 766                                     wh, "WEP", "%s", "PRIVACY off");
 767                                 vap->iv_stats.is_rx_noprivacy++;
 768                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 769                                 goto out;
 770                         }
 771                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 772                                 /* NB: stats+msgs handled in crypto_decap */
 773                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 774                                 goto out;
 775                         }
 776                         wh = mtod(m, struct ieee80211_frame *);
 777                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 778                         has_decrypted = 1;
 779                 } else {
 780                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 781                         key = NULL;
 782                 }
 783
 784                 /*
 785                  * Save QoS bits for use below--before we strip the header.
 786                  */
 787                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 788                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 789                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 790                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 791                 } else
 792                         qos = 0;
 793
 794                 /*
 795                  * Next up, any fragmentation.
 796                  */
 797                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 798                         m = ieee80211_defrag(ni, m, hdrspace);
 799                         if (m == NULL) {
 800                                 /* Fragment dropped or frame not complete yet */
 801                                 goto out;
 802                         }
 803                 }
 804                 wh = NULL;              /* no longer valid, catch any uses */
 805
 806                 /*
 807                  * Next strip any MSDU crypto bits.
 808                  *
 809                  * Note: we can't do MIC stripping/verification if the
 810                  * upper layer has stripped it.  We have to check MIC
 811                  * ourselves.  So, key may be NULL, but we have to check
 812                  * the RX status.
 813                  */
 814                 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
 815                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 816                             ni->ni_macaddr, "data", "%s", "demic error");
 817                         vap->iv_stats.is_rx_demicfail++;
 818                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 819                         goto out;
 820                 }
 821
 822                 /* copy to listener after decrypt */
 823                 if (ieee80211_radiotap_active_vap(vap))
 824                         ieee80211_radiotap_rx(vap, m);
 825                 need_tap = 0;
 826
 827                 /*
 828                  * Finally, strip the 802.11 header.
 829                  */
 830                 m = ieee80211_decap(vap, m, hdrspace);
 831                 if (m == NULL) {
 832                         /* XXX mask bit to check for both */
 833                         /* don't count Null data frames as errors */
 834                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 835                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 836                                 goto out;
 837                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 838                             ni->ni_macaddr, "data", "%s", "decap error");
 839                         vap->iv_stats.is_rx_decap++;
 840                         IEEE80211_NODE_STAT(ni, rx_decap);
 841                         goto err;
 842                 }
 843                 eh = mtod(m, struct ether_header *);
 844                 if (!ieee80211_node_is_authorized(ni)) {
 845                         /*
 846                          * Deny any non-PAE frames received prior to
 847                          * authorization.  For open/shared-key
 848                          * authentication the port is mark authorized
 849                          * after authentication completes.  For 802.1x
 850                          * the port is not marked authorized by the
 851                          * authenticator until the handshake has completed.
 852                          */
 853                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 854                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 855                                     eh->ether_shost, "data",
 856                                     "unauthorized port: ether type 0x%x len %u",
 857                                     eh->ether_type, m->m_pkthdr.len);
 858                                 vap->iv_stats.is_rx_unauth++;
 859                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 860                                 goto err;
 861                         }
 862                 } else {
 863                         /*
 864                          * When denying unencrypted frames, discard
 865                          * any non-PAE frames received without encryption.
 866                          */
 867                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 868                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 869                             (is_hw_decrypted == 0) &&
 870                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 871                                 /*
 872                                  * Drop unencrypted frames.
 873                                  */
 874                                 vap->iv_stats.is_rx_unencrypted++;
 875                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 876                                 goto out;
 877                         }
 878                 }
 879                 /* XXX require HT? */
 880                 if (qos & IEEE80211_QOS_AMSDU) {
 881                         m = ieee80211_decap_amsdu(ni, m);
 882                         if (m == NULL)
 883                                 return IEEE80211_FC0_TYPE_DATA;
 884                 } else {
 885 #ifdef IEEE80211_SUPPORT_SUPERG
 886                         m = ieee80211_decap_fastframe(vap, ni, m);
 887                         if (m == NULL)
 888                                 return IEEE80211_FC0_TYPE_DATA;
 889 #endif
 890                 }
 891                 ieee80211_deliver_data(vap, ni, m);
 892                 return IEEE80211_FC0_TYPE_DATA;
 893
 894         case IEEE80211_FC0_TYPE_MGT:
 895                 vap->iv_stats.is_rx_mgmt++;
 896                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 897                 if (dir != IEEE80211_FC1_DIR_NODS) {
 898                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 899                             wh, "data", "incorrect dir 0x%x", dir);
 900                         vap->iv_stats.is_rx_wrongdir++;
 901                         goto err;
 902                 }
 903                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 904                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 905                             ni->ni_macaddr, "mgt", "too short: len %u",
 906                             m->m_pkthdr.len);
 907                         vap->iv_stats.is_rx_tooshort++;
 908                         goto out;
 909                 }
 910 #ifdef IEEE80211_DEBUG
 911                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 912                     ieee80211_msg_dumppkts(vap)) {
 913                         if_printf(ifp, "received %s from %s rssi %d\n",
 914                             ieee80211_mgt_subtype_name(subtype),
 915                             ether_sprintf(wh->i_addr2), rssi);
 916                 }
 917 #endif
 918
 919                 /*
 920                  * Note: See above for hardware offload privacy requirements.
 921                  *       It also applies here.
 922                  */
 923
 924                 /*
 925                  * Again, having encrypted flag set check would be good, but
 926                  * then we have to also handle crypto_decap() like above.
 927                  */
 928                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 929                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 930                                 /*
 931                                  * Only shared key auth frames with a challenge
 932                                  * should be encrypted, discard all others.
 933                                  */
 934                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 935                                     wh, ieee80211_mgt_subtype_name(subtype),
 936                                     "%s", "WEP set but not permitted");
 937                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 938                                 goto out;
 939                         }
 940                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 941                                 /*
 942                                  * Discard encrypted frames when privacy is off.
 943                                  */
 944                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 945                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 946                                 vap->iv_stats.is_rx_noprivacy++;
 947                                 goto out;
 948                         }
 949                         hdrspace = ieee80211_hdrspace(ic, wh);
 950
 951                         /*
 952                          * Again, if IV/MIC was stripped, then this whole
 953                          * setup will fail.  That's going to need some poking.
 954                          */
 955                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 956                                 /* NB: stats+msgs handled in crypto_decap */
 957                                 goto out;
 958                         }
 959                         has_decrypted = 1;
 960                         wh = mtod(m, struct ieee80211_frame *);
 961                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 962                 }
 963                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 964                 goto out;
 965
 966         case IEEE80211_FC0_TYPE_CTL:
 967                 vap->iv_stats.is_rx_ctl++;
 968                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 969                 vap->iv_recv_ctl(ni, m, subtype);
 970                 goto out;
 971
 972         default:
 973                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 974                     wh, NULL, "bad frame type 0x%x", type);
 975                 /* should not come here */
 976                 break;
 977         }
 978 err:
 979         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 980 out:
 981         if (m != NULL) {
 982                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 983                         ieee80211_radiotap_rx(vap, m);
 984                 m_freem(m);
 985         }
 986         return type;
 987 }
 988
 989 static void
 990 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 991     int rssi, int nf, uint16_t seq, uint16_t status)
 992 {
 993         struct ieee80211vap *vap = ni->ni_vap;
 994
 995         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 996                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 997                     ni->ni_macaddr, "open auth",
 998                     "bad sta auth mode %u", ni->ni_authmode);
 999                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
1000                 return;
1001         }
1002         if (vap->iv_state != IEEE80211_S_AUTH ||
1003             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
1004                 vap->iv_stats.is_rx_bad_auth++;
1005                 return;
1006         }
1007         if (status != 0) {
1008                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1009                     ni, "open auth failed (reason %d)", status);
1010                 vap->iv_stats.is_rx_auth_fail++;
1011                 vap->iv_stats.is_rx_authfail_code = status;
1012                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1013                     IEEE80211_SCAN_FAIL_STATUS);
1014         } else
1015                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1016 }
1017
1018 static void
1019 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1020     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1021     uint16_t seq, uint16_t status)
1022 {
1023         struct ieee80211vap *vap = ni->ni_vap;
1024         uint8_t *challenge;
1025
1026         /*
1027          * NB: this can happen as we allow pre-shared key
1028          * authentication to be enabled w/o wep being turned
1029          * on so that configuration of these can be done
1030          * in any order.  It may be better to enforce the
1031          * ordering in which case this check would just be
1032          * for sanity/consistency.
1033          */
1034         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1035                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1036                     ni->ni_macaddr, "shared key auth",
1037                     "%s", " PRIVACY is disabled");
1038                 goto bad;
1039         }
1040         /*
1041          * Pre-shared key authentication is evil; accept
1042          * it only if explicitly configured (it is supported
1043          * mainly for compatibility with clients like OS X).
1044          */
1045         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1046             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1047                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1048                     ni->ni_macaddr, "shared key auth",
1049                     "bad sta auth mode %u", ni->ni_authmode);
1050                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1051                 goto bad;
1052         }
1053
1054         challenge = NULL;
1055         if (frm + 1 < efrm) {
1056                 if ((frm[1] + 2) > (efrm - frm)) {
1057                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1058                             ni->ni_macaddr, "shared key auth",
1059                             "ie %d/%d too long",
1060                             frm[0], (frm[1] + 2) - (efrm - frm));
1061                         vap->iv_stats.is_rx_bad_auth++;
1062                         goto bad;
1063                 }
1064                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1065                         challenge = frm;
1066                 frm += frm[1] + 2;
1067         }
1068         switch (seq) {
1069         case IEEE80211_AUTH_SHARED_CHALLENGE:
1070         case IEEE80211_AUTH_SHARED_RESPONSE:
1071                 if (challenge == NULL) {
1072                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1073                             ni->ni_macaddr, "shared key auth",
1074                             "%s", "no challenge");
1075                         vap->iv_stats.is_rx_bad_auth++;
1076                         goto bad;
1077                 }
1078                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1079                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1080                             ni->ni_macaddr, "shared key auth",
1081                             "bad challenge len %d", challenge[1]);
1082                         vap->iv_stats.is_rx_bad_auth++;
1083                         goto bad;
1084                 }
1085         default:
1086                 break;
1087         }
1088         if (vap->iv_state != IEEE80211_S_AUTH)
1089                 return;
1090         switch (seq) {
1091         case IEEE80211_AUTH_SHARED_PASS:
1092                 if (ni->ni_challenge != NULL) {
1093                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1094                         ni->ni_challenge = NULL;
1095                 }
1096                 if (status != 0) {
1097                         IEEE80211_NOTE_FRAME(vap,
1098                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1099                             "shared key auth failed (reason %d)", status);
1100                         vap->iv_stats.is_rx_auth_fail++;
1101                         vap->iv_stats.is_rx_authfail_code = status;
1102                         return;
1103                 }
1104                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1105                 break;
1106         case IEEE80211_AUTH_SHARED_CHALLENGE:
1107                 if (!ieee80211_alloc_challenge(ni))
1108                         return;
1109                 /* XXX could optimize by passing recvd challenge */
1110                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1111                 IEEE80211_SEND_MGMT(ni,
1112                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1113                 break;
1114         default:
1115                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1116                     wh, "shared key auth", "bad seq %d", seq);
1117                 vap->iv_stats.is_rx_bad_auth++;
1118                 return;
1119         }
1120         return;
1121 bad:
1122         /*
1123          * Kick the state machine.  This short-circuits
1124          * using the mgt frame timeout to trigger the
1125          * state transition.
1126          */
1127         if (vap->iv_state == IEEE80211_S_AUTH)
1128                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1129                     IEEE80211_SCAN_FAIL_STATUS);
1130 }
1131
1132 int
1133 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1134         const struct ieee80211_frame *wh)
1135 {
1136 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1137         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1138         u_int len = frm[1], qosinfo;
1139         int i;
1140
1141         if (len < sizeof(struct ieee80211_wme_param)-2) {
1142                 IEEE80211_DISCARD_IE(vap,
1143                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1144                     wh, "WME", "too short, len %u", len);
1145                 return -1;
1146         }
1147         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1148         qosinfo &= WME_QOSINFO_COUNT;
1149         /* XXX do proper check for wraparound */
1150         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1151                 return 0;
1152         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1153         for (i = 0; i < WME_NUM_AC; i++) {
1154                 struct wmeParams *wmep =
1155                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1156                 /* NB: ACI not used */
1157                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1158                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1159                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1160                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1161                 wmep->wmep_txopLimit = le16dec(frm+2);
1162                 frm += 4;
1163         }
1164         wme->wme_wmeChanParams.cap_info = qosinfo;
1165         return 1;
1166 #undef MS
1167 }
1168
1169 /*
1170  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1171  * is the first CSA then initiate the switch.  Otherwise we
1172  * track state and trigger completion and/or cancel of the switch.
1173  * XXX should be public for IBSS use
1174  */
1175 static void
1176 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1177         const struct ieee80211_frame *wh)
1178 {
1179         struct ieee80211com *ic = vap->iv_ic;
1180         const struct ieee80211_csa_ie *csa =
1181             (const struct ieee80211_csa_ie *) frm;
1182
1183         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1184             ("state %s", ieee80211_state_name[vap->iv_state]));
1185
1186         if (csa->csa_mode > 1) {
1187                 IEEE80211_DISCARD_IE(vap,
1188                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1189                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1190                 return;
1191         }
1192         IEEE80211_LOCK(ic);
1193         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1194                 /*
1195                  * Convert the channel number to a channel reference.  We
1196                  * try first to preserve turbo attribute of the current
1197                  * channel then fallback.  Note this will not work if the
1198                  * CSA specifies a channel that requires a band switch (e.g.
1199                  * 11a => 11g).  This is intentional as 11h is defined only
1200                  * for 5GHz/11a and because the switch does not involve a
1201                  * reassociation, protocol state (capabilities, negotated
1202                  * rates, etc) may/will be wrong.
1203                  */
1204                 struct ieee80211_channel *c =
1205                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1206                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1207                 if (c == NULL) {
1208                         c = ieee80211_find_channel_byieee(ic,
1209                             csa->csa_newchan,
1210                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1211                         if (c == NULL) {
1212                                 IEEE80211_DISCARD_IE(vap,
1213                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1214                                     wh, "CSA", "invalid channel %u",
1215                                     csa->csa_newchan);
1216                                 goto done;
1217                         }
1218                 }
1219 #if IEEE80211_CSA_COUNT_MIN > 0
1220                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1221                         /*
1222                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1223                          * reduce the risk of being redirected by a fabricated
1224                          * CSA.  If a valid CSA is dropped we'll still get a
1225                          * beacon miss when the AP leaves the channel so we'll
1226                          * eventually follow to the new channel.
1227                          *
1228                          * NOTE: this violates the 11h spec that states that
1229                          * count may be any value and if 0 then a switch
1230                          * should happen asap.
1231                          */
1232                         IEEE80211_DISCARD_IE(vap,
1233                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1234                             wh, "CSA", "count %u too small, must be >= %u",
1235                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1236                         goto done;
1237                 }
1238 #endif
1239                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1240         } else {
1241                 /*
1242                  * Validate this ie against the initial CSA.  We require
1243                  * mode and channel not change and the count must be
1244                  * monotonically decreasing.  This may be pointless and
1245                  * canceling the switch as a result may be too paranoid but
1246                  * in the worst case if we drop out of CSA because of this
1247                  * and the AP does move then we'll just end up taking a
1248                  * beacon miss and scan to find the AP.
1249                  *
1250                  * XXX may want <= on count as we also process ProbeResp
1251                  * frames and those may come in w/ the same count as the
1252                  * previous beacon; but doing so leaves us open to a stuck
1253                  * count until we add a dead-man timer
1254                  */
1255                 if (!(csa->csa_count < ic->ic_csa_count &&
1256                       csa->csa_mode == ic->ic_csa_mode &&
1257                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1258                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1259                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1260                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1261                             ic->ic_csa_newchan, ic->ic_csa_count,
1262                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1263                         ieee80211_csa_cancelswitch(ic);
1264                 } else {
1265                         if (csa->csa_count <= 1)
1266                                 ieee80211_csa_completeswitch(ic);
1267                         else
1268                                 ic->ic_csa_count = csa->csa_count;
1269                 }
1270         }
1271 done:
1272         IEEE80211_UNLOCK(ic);
1273 }
1274
1275 /*
1276  * Return non-zero if a background scan may be continued:
1277  * o bg scan is active
1278  * o no channel switch is pending
1279  * o there has not been any traffic recently
1280  * o no full-offload scan support (no need for explicitly continuing scan then)
1281  *
1282  * Note we do not check if there is an administrative enable;
1283  * this is only done to start the scan.  We assume that any
1284  * change in state will be accompanied by a request to cancel
1285  * active scans which will otherwise cause this test to fail.
1286  */
1287 static __inline int
1288 contbgscan(struct ieee80211vap *vap)
1289 {
1290         struct ieee80211com *ic = vap->iv_ic;
1291
1292         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1293             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1294             !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) &&
1295             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1296             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1297 }
1298
1299 /*
1300  * Return non-zero if a backgrond scan may be started:
1301  * o bg scanning is administratively enabled
1302  * o no channel switch is pending
1303  * o we are not boosted on a dynamic turbo channel
1304  * o there has not been a scan recently
1305  * o there has not been any traffic recently (don't check if full-offload scan)
1306  */
1307 static __inline int
1308 startbgscan(struct ieee80211vap *vap)
1309 {
1310         struct ieee80211com *ic = vap->iv_ic;
1311
1312         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1313             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1314 #ifdef IEEE80211_SUPPORT_SUPERG
1315             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1316 #endif
1317             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1318             ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) ||
1319              ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)));
1320 }
1321
1322 #ifdef  notyet
1323 /*
1324  * Compare two quiet IEs and return if they are equivalent.
1325  *
1326  * The tbttcount isnt checked - that's not part of the configuration.
1327  */
1328 static int
1329 compare_quiet_ie(const struct ieee80211_quiet_ie *q1,
1330     const struct ieee80211_quiet_ie *q2)
1331 {
1332
1333         if (q1->period != q2->period)
1334                 return (0);
1335         if (le16dec(&q1->duration) != le16dec(&q2->duration))
1336                 return (0);
1337         if (le16dec(&q1->offset) != le16dec(&q2->offset))
1338                 return (0);
1339         return (1);
1340 }
1341 #endif
1342
1343 static void
1344 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1345     const struct ieee80211_rx_stats *rxs,
1346     int rssi, int nf)
1347 {
1348 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1349         struct ieee80211vap *vap = ni->ni_vap;
1350         struct ieee80211com *ic = ni->ni_ic;
1351         struct ieee80211_channel *rxchan = ic->ic_curchan;
1352         struct ieee80211_frame *wh;
1353         uint8_t *frm, *efrm;
1354         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1355         uint8_t *vhtcap, *vhtopmode;
1356         uint8_t rate;
1357         int ht_state_change = 0, do_ht = 0;
1358
1359         wh = mtod(m0, struct ieee80211_frame *);
1360         frm = (uint8_t *)&wh[1];
1361         efrm = mtod(m0, uint8_t *) + m0->m_len;
1362         switch (subtype) {
1363         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1364         case IEEE80211_FC0_SUBTYPE_BEACON: {
1365                 struct ieee80211_scanparams scan;
1366                 struct ieee80211_channel *c;
1367                 /*
1368                  * We process beacon/probe response frames:
1369                  *    o when scanning, or
1370                  *    o station mode when associated (to collect state
1371                  *      updates such as 802.11g slot time)
1372                  * Frames otherwise received are discarded.
1373                  */
1374                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1375                         vap->iv_stats.is_rx_mgtdiscard++;
1376                         return;
1377                 }
1378
1379                 /* Override RX channel as appropriate */
1380                 if (rxs != NULL) {
1381                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1382                         if (c != NULL)
1383                                 rxchan = c;
1384                 }
1385
1386                 /* XXX probe response in sta mode when !scanning? */
1387                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1388                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1389                                 vap->iv_stats.is_beacon_bad++;
1390                         return;
1391                 }
1392
1393                 /*
1394                  * Count frame now that we know it's to be processed.
1395                  */
1396                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1397                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1398                         IEEE80211_NODE_STAT(ni, rx_beacons);
1399                 } else
1400                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1401                 /*
1402                  * When operating in station mode, check for state updates.
1403                  * Be careful to ignore beacons received while doing a
1404                  * background scan.  We consider only 11g/WMM stuff right now.
1405                  */
1406                 if (ni->ni_associd != 0 &&
1407                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1408                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1409                         /* record tsf of last beacon */
1410                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1411                                 sizeof(ni->ni_tstamp));
1412                         /* count beacon frame for s/w bmiss handling */
1413                         vap->iv_swbmiss_count++;
1414                         vap->iv_bmiss_count = 0;
1415                         if (ni->ni_erp != scan.erp) {
1416                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1417                                     wh->i_addr2,
1418                                     "erp change: was 0x%x, now 0x%x",
1419                                     ni->ni_erp, scan.erp);
1420                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1421                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1422                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1423                                 else
1424                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1425                                 ni->ni_erp = scan.erp;
1426                                 /* XXX statistic */
1427                                 /* XXX driver notification */
1428                         }
1429                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1430                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1431                                     wh->i_addr2,
1432                                     "capabilities change: was 0x%x, now 0x%x",
1433                                     ni->ni_capinfo, scan.capinfo);
1434                                 /*
1435                                  * NB: we assume short preamble doesn't
1436                                  *     change dynamically
1437                                  */
1438                                 ieee80211_set_shortslottime(ic,
1439                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1440                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1441                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1442                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1443                                 /* XXX statistic */
1444                         }
1445                         if (scan.wme != NULL &&
1446                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1447                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1448                                 ieee80211_wme_updateparams(vap);
1449 #ifdef IEEE80211_SUPPORT_SUPERG
1450                         if (scan.ath != NULL)
1451                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1452 #endif
1453                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1454                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1455                                 /* XXX state changes? */
1456                                 ieee80211_ht_updateparams(ni,
1457                                     scan.htcap, scan.htinfo);
1458                                 do_ht = 1;
1459                         }
1460                         if (scan.vhtcap != NULL && scan.vhtopmode != NULL &&
1461                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1462                                 /* XXX state changes? */
1463                                 ieee80211_vht_updateparams(ni,
1464                                     scan.vhtcap, scan.vhtopmode);
1465                                 do_ht = 1;
1466                         }
1467                         if (do_ht) {
1468                                 if (ieee80211_ht_updateparams_final(ni,
1469                                     scan.htcap, scan.htinfo))
1470                                         ht_state_change = 1;
1471                         }
1472
1473                         /*
1474                          * If we have a quiet time IE then report it up to
1475                          * the driver.
1476                          *
1477                          * Otherwise, inform the driver that the quiet time
1478                          * IE has disappeared - only do that once rather than
1479                          * spamming it each time.
1480                          */
1481                         if (scan.quiet) {
1482                                 ic->ic_set_quiet(ni, scan.quiet);
1483                                 ni->ni_quiet_ie_set = 1;
1484                                 memcpy(&ni->ni_quiet_ie, scan.quiet,
1485                                     sizeof(struct ieee80211_quiet_ie));
1486                         } else {
1487                                 if (ni->ni_quiet_ie_set == 1)
1488                                         ic->ic_set_quiet(ni, NULL);
1489                                 ni->ni_quiet_ie_set = 0;
1490                                 bzero(&ni->ni_quiet_ie,
1491                                     sizeof(struct ieee80211_quiet_ie));
1492                         }
1493
1494                         if (scan.tim != NULL) {
1495                                 struct ieee80211_tim_ie *tim =
1496                                     (struct ieee80211_tim_ie *) scan.tim;
1497                                 /*
1498                                  * XXX Check/debug this code; see if it's about
1499                                  * the right time to force the VAP awake if we
1500                                  * receive a frame destined for us?
1501                                  */
1502                                 int aid = IEEE80211_AID(ni->ni_associd);
1503                                 int ix = aid / NBBY;
1504                                 int min = tim->tim_bitctl &~ 1;
1505                                 int max = tim->tim_len + min - 4;
1506                                 int tim_ucast = 0, tim_mcast = 0;
1507
1508                                 /*
1509                                  * Only do this for unicast traffic in the TIM
1510                                  * The multicast traffic notification for
1511                                  * the scan notification stuff should occur
1512                                  * differently.
1513                                  */
1514                                 if (min <= ix && ix <= max &&
1515                                      isset(tim->tim_bitmap - min, aid)) {
1516                                         tim_ucast = 1;
1517                                 }
1518
1519                                 /*
1520                                  * Do a separate notification
1521                                  * for the multicast bit being set.
1522                                  */
1523                                 if (tim->tim_bitctl & 1) {
1524                                         tim_mcast = 1;
1525                                 }
1526
1527                                 /*
1528                                  * If the TIM indicates there's traffic for
1529                                  * us then get us out of STA mode powersave.
1530                                  */
1531                                 if (tim_ucast == 1) {
1532
1533                                         /*
1534                                          * Wake us out of SLEEP state if we're
1535                                          * in it; and if we're doing bgscan
1536                                          * then wake us out of STA powersave.
1537                                          */
1538                                         ieee80211_sta_tim_notify(vap, 1);
1539
1540                                         /*
1541                                          * This is preventing us from
1542                                          * continuing a bgscan; because it
1543                                          * tricks the contbgscan()
1544                                          * routine to think there's always
1545                                          * traffic for us.
1546                                          *
1547                                          * I think we need both an RX and
1548                                          * TX ic_lastdata field.
1549                                          */
1550                                         ic->ic_lastdata = ticks;
1551                                 }
1552
1553                                 ni->ni_dtim_count = tim->tim_count;
1554                                 ni->ni_dtim_period = tim->tim_period;
1555                         }
1556                         if (scan.csa != NULL &&
1557                             (vap->iv_flags & IEEE80211_F_DOTH))
1558                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1559                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1560                                 /*
1561                                  * No CSA ie or 11h disabled, but a channel
1562                                  * switch is pending; drop out so we aren't
1563                                  * stuck in CSA state.  If the AP really is
1564                                  * moving we'll get a beacon miss and scan.
1565                                  */
1566                                 IEEE80211_LOCK(ic);
1567                                 ieee80211_csa_cancelswitch(ic);
1568                                 IEEE80211_UNLOCK(ic);
1569                         }
1570                         /*
1571                          * If scanning, pass the info to the scan module.
1572                          * Otherwise, check if it's the right time to do
1573                          * a background scan.  Background scanning must
1574                          * be enabled and we must not be operating in the
1575                          * turbo phase of dynamic turbo mode.  Then,
1576                          * it's been a while since the last background
1577                          * scan and if no data frames have come through
1578                          * recently, kick off a scan.  Note that this
1579                          * is the mechanism by which a background scan
1580                          * is started _and_ continued each time we
1581                          * return on-channel to receive a beacon from
1582                          * our ap.
1583                          */
1584                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1585                                 ieee80211_add_scan(vap, rxchan,
1586                                     &scan, wh, subtype, rssi, nf);
1587                         } else if (contbgscan(vap)) {
1588                                 ieee80211_bg_scan(vap, 0);
1589                         } else if (startbgscan(vap)) {
1590                                 vap->iv_stats.is_scan_bg++;
1591 #if 0
1592                                 /* wakeup if we are sleeing */
1593                                 ieee80211_set_pwrsave(vap, 0);
1594 #endif
1595                                 ieee80211_bg_scan(vap, 0);
1596                         }
1597
1598                         /*
1599                          * Put the station to sleep if we haven't seen
1600                          * traffic in a while.
1601                          */
1602                         IEEE80211_LOCK(ic);
1603                         ieee80211_sta_ps_timer_check(vap);
1604                         IEEE80211_UNLOCK(ic);
1605
1606                         /*
1607                          * If we've had a channel width change (eg HT20<->HT40)
1608                          * then schedule a delayed driver notification.
1609                          */
1610                         if (ht_state_change)
1611                                 ieee80211_update_chw(ic);
1612                         return;
1613                 }
1614                 /*
1615                  * If scanning, just pass information to the scan module.
1616                  */
1617                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1618                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1619                                 /*
1620                                  * Actively scanning a channel marked passive;
1621                                  * send a probe request now that we know there
1622                                  * is 802.11 traffic present.
1623                                  *
1624                                  * XXX check if the beacon we recv'd gives
1625                                  * us what we need and suppress the probe req
1626                                  */
1627                                 ieee80211_probe_curchan(vap, 1);
1628                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1629                         }
1630                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1631                             subtype, rssi, nf);
1632                         return;
1633                 }
1634                 break;
1635         }
1636
1637         case IEEE80211_FC0_SUBTYPE_AUTH: {
1638                 uint16_t algo, seq, status;
1639                 /*
1640                  * auth frame format
1641                  *      [2] algorithm
1642                  *      [2] sequence
1643                  *      [2] status
1644                  *      [tlv*] challenge
1645                  */
1646                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1647                 algo   = le16toh(*(uint16_t *)frm);
1648                 seq    = le16toh(*(uint16_t *)(frm + 2));
1649                 status = le16toh(*(uint16_t *)(frm + 4));
1650                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1651                     "recv auth frame with algorithm %d seq %d", algo, seq);
1652
1653                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1654                         IEEE80211_DISCARD(vap,
1655                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1656                             wh, "auth", "%s", "TKIP countermeasures enabled");
1657                         vap->iv_stats.is_rx_auth_countermeasures++;
1658                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1659                                 ieee80211_send_error(ni, wh->i_addr2,
1660                                         IEEE80211_FC0_SUBTYPE_AUTH,
1661                                         IEEE80211_REASON_MIC_FAILURE);
1662                         }
1663                         return;
1664                 }
1665                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1666                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1667                             seq, status);
1668                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1669                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1670                 else {
1671                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1672                             wh, "auth", "unsupported alg %d", algo);
1673                         vap->iv_stats.is_rx_auth_unsupported++;
1674                         return;
1675                 }
1676                 break;
1677         }
1678
1679         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1680         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1681                 uint16_t capinfo, associd;
1682                 uint16_t status;
1683
1684                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1685                         vap->iv_stats.is_rx_mgtdiscard++;
1686                         return;
1687                 }
1688
1689                 /*
1690                  * asresp frame format
1691                  *      [2] capability information
1692                  *      [2] status
1693                  *      [2] association ID
1694                  *      [tlv] supported rates
1695                  *      [tlv] extended supported rates
1696                  *      [tlv] WME
1697                  *      [tlv] HT capabilities
1698                  *      [tlv] HT info
1699                  */
1700                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1701                 ni = vap->iv_bss;
1702                 capinfo = le16toh(*(uint16_t *)frm);
1703                 frm += 2;
1704                 status = le16toh(*(uint16_t *)frm);
1705                 frm += 2;
1706                 if (status != 0) {
1707                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1708                             wh->i_addr2, "%sassoc failed (reason %d)",
1709                             ISREASSOC(subtype) ?  "re" : "", status);
1710                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1711                         return;
1712                 }
1713                 associd = le16toh(*(uint16_t *)frm);
1714                 frm += 2;
1715
1716                 rates = xrates = wme = htcap = htinfo = NULL;
1717                 vhtcap = vhtopmode = NULL;
1718                 while (efrm - frm > 1) {
1719                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1720                         switch (*frm) {
1721                         case IEEE80211_ELEMID_RATES:
1722                                 rates = frm;
1723                                 break;
1724                         case IEEE80211_ELEMID_XRATES:
1725                                 xrates = frm;
1726                                 break;
1727                         case IEEE80211_ELEMID_HTCAP:
1728                                 htcap = frm;
1729                                 break;
1730                         case IEEE80211_ELEMID_HTINFO:
1731                                 htinfo = frm;
1732                                 break;
1733                         case IEEE80211_ELEMID_VENDOR:
1734                                 if (iswmeoui(frm))
1735                                         wme = frm;
1736                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1737                                         /*
1738                                          * Accept pre-draft HT ie's if the
1739                                          * standard ones have not been seen.
1740                                          */
1741                                         if (ishtcapoui(frm)) {
1742                                                 if (htcap == NULL)
1743                                                         htcap = frm;
1744                                         } else if (ishtinfooui(frm)) {
1745                                                 if (htinfo == NULL)
1746                                                         htinfo = frm;
1747                                         }
1748                                 }
1749                                 /* XXX Atheros OUI support */
1750                                 break;
1751                         case IEEE80211_ELEMID_VHT_CAP:
1752                                 vhtcap = frm;
1753                                 break;
1754                         case IEEE80211_ELEMID_VHT_OPMODE:
1755                                 vhtopmode = frm;
1756                                 break;
1757                         }
1758                         frm += frm[1] + 2;
1759                 }
1760
1761                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1762                 if (xrates != NULL)
1763                         IEEE80211_VERIFY_ELEMENT(xrates,
1764                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1765                 rate = ieee80211_setup_rates(ni, rates, xrates,
1766                                 IEEE80211_F_JOIN |
1767                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1768                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1769                 if (rate & IEEE80211_RATE_BASIC) {
1770                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1771                             wh->i_addr2,
1772                             "%sassoc failed (rate set mismatch)",
1773                             ISREASSOC(subtype) ?  "re" : "");
1774                         vap->iv_stats.is_rx_assoc_norate++;
1775                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1776                             IEEE80211_SCAN_FAIL_STATUS);
1777                         return;
1778                 }
1779
1780                 ni->ni_capinfo = capinfo;
1781                 ni->ni_associd = associd;
1782                 if (ni->ni_jointime == 0)
1783                         ni->ni_jointime = time_uptime;
1784                 if (wme != NULL &&
1785                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1786                         ni->ni_flags |= IEEE80211_NODE_QOS;
1787                         ieee80211_wme_updateparams(vap);
1788                 } else
1789                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1790                 /*
1791                  * Setup HT state according to the negotiation.
1792                  *
1793                  * NB: shouldn't need to check if HT use is enabled but some
1794                  *     ap's send back HT ie's even when we don't indicate we
1795                  *     are HT capable in our AssocReq.
1796                  */
1797                 if (htcap != NULL && htinfo != NULL &&
1798                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1799                         ieee80211_ht_node_init(ni);
1800                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1801
1802                         if ((vhtcap != NULL) && (vhtopmode != NULL) &
1803                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1804                                 /*
1805                                  * Log if we get a VHT assoc/reassoc response.
1806                                  * We aren't ready for 2GHz VHT support.
1807                                  */
1808                                 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1809                                         printf("%s: peer %6D: VHT on 2GHz, ignoring\n",
1810                                             __func__,
1811                                             ni->ni_macaddr,
1812                                             ":");
1813                                 } else {
1814                                         ieee80211_vht_node_init(ni);
1815                                         ieee80211_vht_updateparams(ni, vhtcap, vhtopmode);
1816                                         ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode);
1817                                 }
1818                         }
1819
1820                         ieee80211_ht_updateparams_final(ni, htcap, htinfo);
1821                         ieee80211_setup_htrates(ni, htcap,
1822                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1823                         ieee80211_setup_basic_htrates(ni, htinfo);
1824
1825                         ieee80211_node_setuptxparms(ni);
1826                         ieee80211_ratectl_node_init(ni);
1827                 }
1828
1829                 /*
1830                  * Always initialise FF/superg state; we can use this
1831                  * for doing A-MSDU encapsulation as well.
1832                  */
1833 #ifdef  IEEE80211_SUPPORT_SUPERG
1834                 ieee80211_ff_node_init(ni);
1835 #endif
1836
1837                 /*
1838                  * Configure state now that we are associated.
1839                  *
1840                  * XXX may need different/additional driver callbacks?
1841                  */
1842                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1843                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1844                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1845                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1846                 } else {
1847                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1848                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1849                 }
1850                 ieee80211_set_shortslottime(ic,
1851                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1852                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1853                 /*
1854                  * Honor ERP protection.
1855                  *
1856                  * NB: ni_erp should zero for non-11g operation.
1857                  */
1858                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1859                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1860                         ic->ic_flags |= IEEE80211_F_USEPROT;
1861                 else
1862                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1863                 IEEE80211_NOTE_MAC(vap,
1864                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1865                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1866                     ISREASSOC(subtype) ? "re" : "",
1867                     IEEE80211_NODE_AID(ni),
1868                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1869                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1870                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1871                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1872                     ni->ni_flags & IEEE80211_NODE_HT ?
1873                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1874                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1875                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1876                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1877                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1878                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1879                         ", fast-frames" : "",
1880                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1881                         ", turbo" : ""
1882                 );
1883                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1884                 break;
1885         }
1886
1887         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1888                 uint16_t reason;
1889
1890                 if (vap->iv_state == IEEE80211_S_SCAN) {
1891                         vap->iv_stats.is_rx_mgtdiscard++;
1892                         return;
1893                 }
1894                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1895                         /* NB: can happen when in promiscuous mode */
1896                         vap->iv_stats.is_rx_mgtdiscard++;
1897                         break;
1898                 }
1899
1900                 /*
1901                  * deauth frame format
1902                  *      [2] reason
1903                  */
1904                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1905                 reason = le16toh(*(uint16_t *)frm);
1906
1907                 vap->iv_stats.is_rx_deauth++;
1908                 vap->iv_stats.is_rx_deauth_code = reason;
1909                 IEEE80211_NODE_STAT(ni, rx_deauth);
1910
1911                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1912                     "recv deauthenticate (reason: %d (%s))", reason,
1913                     ieee80211_reason_to_string(reason));
1914                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1915                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1916                 break;
1917         }
1918
1919         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1920                 uint16_t reason;
1921
1922                 if (vap->iv_state != IEEE80211_S_RUN &&
1923                     vap->iv_state != IEEE80211_S_ASSOC &&
1924                     vap->iv_state != IEEE80211_S_AUTH) {
1925                         vap->iv_stats.is_rx_mgtdiscard++;
1926                         return;
1927                 }
1928                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1929                         /* NB: can happen when in promiscuous mode */
1930                         vap->iv_stats.is_rx_mgtdiscard++;
1931                         break;
1932                 }
1933
1934                 /*
1935                  * disassoc frame format
1936                  *      [2] reason
1937                  */
1938                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1939                 reason = le16toh(*(uint16_t *)frm);
1940
1941                 vap->iv_stats.is_rx_disassoc++;
1942                 vap->iv_stats.is_rx_disassoc_code = reason;
1943                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1944
1945                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1946                     "recv disassociate (reason: %d (%s))", reason,
1947                     ieee80211_reason_to_string(reason));
1948                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1949                 break;
1950         }
1951
1952         case IEEE80211_FC0_SUBTYPE_ACTION:
1953         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1954                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1955                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1956                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1957                             wh, NULL, "%s", "not for us");
1958                         vap->iv_stats.is_rx_mgtdiscard++;
1959                 } else if (vap->iv_state != IEEE80211_S_RUN) {
1960                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1961                             wh, NULL, "wrong state %s",
1962                             ieee80211_state_name[vap->iv_state]);
1963                         vap->iv_stats.is_rx_mgtdiscard++;
1964                 } else {
1965                         if (ieee80211_parse_action(ni, m0) == 0)
1966                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1967                 }
1968                 break;
1969
1970         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1971         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1972         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1973         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1974         case IEEE80211_FC0_SUBTYPE_ATIM:
1975                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1976                     wh, NULL, "%s", "not handled");
1977                 vap->iv_stats.is_rx_mgtdiscard++;
1978                 break;
1979
1980         default:
1981                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1982                     wh, "mgt", "subtype 0x%x not handled", subtype);
1983                 vap->iv_stats.is_rx_badsubtype++;
1984                 break;
1985         }
1986 #undef ISREASSOC
1987 }
1988
1989 static void
1990 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1991 {
1992         switch (subtype) {
1993         case IEEE80211_FC0_SUBTYPE_BAR:
1994                 ieee80211_recv_bar(ni, m);
1995                 break;
1996         }
1997 }