sys/netproto/802_11/wlan/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  * $FreeBSD: head/sys/net80211/ieee80211_sta.c 203422 2010-02-03 10:07:43Z rpaulo $
  26  */
  27
  28 /*
  29  * IEEE 802.11 Station mode support.
  30  */
  31 #include "opt_inet.h"
  32 #include "opt_wlan.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/malloc.h>
  38 #include <sys/kernel.h>
  39
  40 #include <sys/socket.h>
  41 #include <sys/sockio.h>
  42 #include <sys/endian.h>
  43 #include <sys/errno.h>
  44 #include <sys/proc.h>
  45 #include <sys/sysctl.h>
  46
  47 #include <net/if.h>
  48 #include <net/if_media.h>
  49 #include <net/if_llc.h>
  50 #include <net/ethernet.h>
  51 #include <net/route.h>
  52
  53 #include <net/bpf.h>
  54
  55 #include <netproto/802_11/ieee80211_var.h>
  56 #include <netproto/802_11/ieee80211_sta.h>
  57 #include <netproto/802_11/ieee80211_input.h>
  58 #ifdef IEEE80211_SUPPORT_SUPERG
  59 #include <netproto/802_11/ieee80211_superg.h>
  60 #endif
  61
  62 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  63
  64 static  void sta_vattach(struct ieee80211vap *);
  65 static  void sta_beacon_miss(struct ieee80211vap *);
  66 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  67 static  int sta_input(struct ieee80211_node *, struct mbuf *, int, int);
  68 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  69             int subtype, int rssi, int nf);
  70 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  71
  72 void
  73 ieee80211_sta_attach(struct ieee80211com *ic)
  74 {
  75         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  76 }
  77
  78 void
  79 ieee80211_sta_detach(struct ieee80211com *ic)
  80 {
  81 }
  82
  83 static void
  84 sta_vdetach(struct ieee80211vap *vap)
  85 {
  86 }
  87
  88 static void
  89 sta_vattach(struct ieee80211vap *vap)
  90 {
  91         vap->iv_newstate = sta_newstate;
  92         vap->iv_input = sta_input;
  93         vap->iv_recv_mgmt = sta_recv_mgmt;
  94         vap->iv_recv_ctl = sta_recv_ctl;
  95         vap->iv_opdetach = sta_vdetach;
  96         vap->iv_bmiss = sta_beacon_miss;
  97 }
  98
  99 /*
 100  * Handle a beacon miss event.  The common code filters out
 101  * spurious events that can happen when scanning and/or before
 102  * reaching RUN state.
 103  */
 104 static void
 105 sta_beacon_miss(struct ieee80211vap *vap)
 106 {
 107         struct ieee80211com *ic = vap->iv_ic;
 108
 109         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 110         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 111             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 112
 113         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 114             "beacon miss, mode %s state %s\n",
 115             ieee80211_opmode_name[vap->iv_opmode],
 116             ieee80211_state_name[vap->iv_state]);
 117
 118         if (vap->iv_state == IEEE80211_S_CSA) {
 119                 /*
 120                  * A Channel Switch is pending; assume we missed the
 121                  * beacon that would've completed the process and just
 122                  * force the switch.  If we made a mistake we'll not
 123                  * find the AP on the new channel and fall back to a
 124                  * normal scan.
 125                  */
 126                 ieee80211_csa_completeswitch(ic);
 127                 return;
 128         }
 129         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 130                 /*
 131                  * Send a directed probe req before falling back to a
 132                  * scan; if we receive a response ic_bmiss_count will
 133                  * be reset.  Some cards mistakenly report beacon miss
 134                  * so this avoids the expensive scan if the ap is
 135                  * still there.
 136                  */
 137                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 138                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 139                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 140                 return;
 141         }
 142         vap->iv_bmiss_count = 0;
 143         vap->iv_stats.is_beacon_miss++;
 144         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 145 #ifdef IEEE80211_SUPPORT_SUPERG
 146                 struct ieee80211com *ic = vap->iv_ic;
 147
 148                 /*
 149                  * If we receive a beacon miss interrupt when using
 150                  * dynamic turbo, attempt to switch modes before
 151                  * reassociating.
 152                  */
 153                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 154                         ieee80211_dturbo_switch(vap,
 155                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 156 #endif
 157                 /*
 158                  * Try to reassociate before scanning for a new ap.
 159                  */
 160                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 161         } else {
 162                 /*
 163                  * Somebody else is controlling state changes (e.g.
 164                  * a user-mode app) don't do anything that would
 165                  * confuse them; just drop into scan mode so they'll
 166                  * notified of the state change and given control.
 167                  */
 168                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 169         }
 170 }
 171
 172 /*
 173  * Handle deauth with reason.  We retry only for
 174  * the cases where we might succeed.  Otherwise
 175  * we downgrade the ap and scan.
 176  */
 177 static void
 178 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 179 {
 180         switch (reason) {
 181         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 182         case IEEE80211_STATUS_TIMEOUT:
 183         case IEEE80211_REASON_ASSOC_EXPIRE:
 184         case IEEE80211_REASON_NOT_AUTHED:
 185         case IEEE80211_REASON_NOT_ASSOCED:
 186         case IEEE80211_REASON_ASSOC_LEAVE:
 187         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 188                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 189                 break;
 190         default:
 191                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 192                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 193                         ieee80211_check_scan_current(vap);
 194                 break;
 195         }
 196 }
 197
 198 /*
 199  * IEEE80211_M_STA vap state machine handler.
 200  * This routine handles the main states in the 802.11 protocol.
 201  */
 202 static int
 203 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 204 {
 205         struct ieee80211com *ic = vap->iv_ic;
 206         struct ieee80211_node *ni;
 207         enum ieee80211_state ostate;
 208 #ifdef IEEE80211_DEBUG
 209         char ethstr[ETHER_ADDRSTRLEN + 1];
 210 #endif
 211         ostate = vap->iv_state;
 212         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 213             __func__, ieee80211_state_name[ostate],
 214             ieee80211_state_name[nstate], arg);
 215         vap->iv_state = nstate;                 /* state transition */
 216         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 217         if (ostate != IEEE80211_S_SCAN)
 218                 ieee80211_cancel_scan(vap);     /* background scan */
 219         ni = vap->iv_bss;                       /* NB: no reference held */
 220         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 221                 callout_stop(&vap->iv_swbmiss);
 222         switch (nstate) {
 223         case IEEE80211_S_INIT:
 224                 switch (ostate) {
 225                 case IEEE80211_S_SLEEP:
 226                         /* XXX wakeup */
 227                 case IEEE80211_S_RUN:
 228                         IEEE80211_SEND_MGMT(ni,
 229                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 230                             IEEE80211_REASON_ASSOC_LEAVE);
 231                         ieee80211_sta_leave(ni);
 232                         break;
 233                 case IEEE80211_S_ASSOC:
 234                         IEEE80211_SEND_MGMT(ni,
 235                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 236                             IEEE80211_REASON_AUTH_LEAVE);
 237                         break;
 238                 case IEEE80211_S_SCAN:
 239                         ieee80211_cancel_scan(vap);
 240                         break;
 241                 default:
 242                         goto invalid;
 243                 }
 244                 if (ostate != IEEE80211_S_INIT) {
 245                         /* NB: optimize INIT -> INIT case */
 246                         ieee80211_reset_bss(vap);
 247                 }
 248                 if (vap->iv_auth->ia_detach != NULL)
 249                         vap->iv_auth->ia_detach(vap);
 250                 break;
 251         case IEEE80211_S_SCAN:
 252                 switch (ostate) {
 253                 case IEEE80211_S_INIT:
 254                         /*
 255                          * Initiate a scan.  We can come here as a result
 256                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 257                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 258                          * and the scan request parameters will be present
 259                          * in iv_scanreq.  Otherwise we do the default.
 260                          */
 261                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 262                                 ieee80211_check_scan(vap,
 263                                     vap->iv_scanreq_flags,
 264                                     vap->iv_scanreq_duration,
 265                                     vap->iv_scanreq_mindwell,
 266                                     vap->iv_scanreq_maxdwell,
 267                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 268                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 269                         } else
 270                                 ieee80211_check_scan_current(vap);
 271                         break;
 272                 case IEEE80211_S_SCAN:
 273                 case IEEE80211_S_AUTH:
 274                 case IEEE80211_S_ASSOC:
 275                         /*
 276                          * These can happen either because of a timeout
 277                          * on an assoc/auth response or because of a
 278                          * change in state that requires a reset.  For
 279                          * the former we're called with a non-zero arg
 280                          * that is the cause for the failure; pass this
 281                          * to the scan code so it can update state.
 282                          * Otherwise trigger a new scan unless we're in
 283                          * manual roaming mode in which case an application
 284                          * must issue an explicit scan request.
 285                          */
 286                         if (arg != 0)
 287                                 ieee80211_scan_assoc_fail(vap,
 288                                         vap->iv_bss->ni_macaddr, arg);
 289                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 290                                 ieee80211_check_scan_current(vap);
 291                         break;
 292                 case IEEE80211_S_RUN:           /* beacon miss */
 293                         /*
 294                          * Beacon miss.  Notify user space and if not
 295                          * under control of a user application (roaming
 296                          * manual) kick off a scan to re-connect.
 297                          */
 298                         ieee80211_sta_leave(ni);
 299                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 300                                 ieee80211_check_scan_current(vap);
 301                         break;
 302                 default:
 303                         goto invalid;
 304                 }
 305                 break;
 306         case IEEE80211_S_AUTH:
 307                 switch (ostate) {
 308                 case IEEE80211_S_INIT:
 309                 case IEEE80211_S_SCAN:
 310                         IEEE80211_SEND_MGMT(ni,
 311                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 312                         break;
 313                 case IEEE80211_S_AUTH:
 314                 case IEEE80211_S_ASSOC:
 315                         switch (arg & 0xff) {
 316                         case IEEE80211_FC0_SUBTYPE_AUTH:
 317                                 /* ??? */
 318                                 IEEE80211_SEND_MGMT(ni,
 319                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 320                                 break;
 321                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 322                                 sta_authretry(vap, ni, arg>>8);
 323                                 break;
 324                         }
 325                         break;
 326                 case IEEE80211_S_RUN:
 327                         switch (arg & 0xff) {
 328                         case IEEE80211_FC0_SUBTYPE_AUTH:
 329                                 IEEE80211_SEND_MGMT(ni,
 330                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 331                                 vap->iv_state = ostate; /* stay RUN */
 332                                 break;
 333                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 334                                 ieee80211_sta_leave(ni);
 335                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 336                                         /* try to reauth */
 337                                         IEEE80211_SEND_MGMT(ni,
 338                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 339                                 }
 340                                 break;
 341                         }
 342                         break;
 343                 default:
 344                         goto invalid;
 345                 }
 346                 break;
 347         case IEEE80211_S_ASSOC:
 348                 switch (ostate) {
 349                 case IEEE80211_S_AUTH:
 350                 case IEEE80211_S_ASSOC:
 351                         IEEE80211_SEND_MGMT(ni,
 352                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 353                         break;
 354                 case IEEE80211_S_SLEEP:         /* cannot happen */
 355                 case IEEE80211_S_RUN:
 356                         ieee80211_sta_leave(ni);
 357                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 358                                 IEEE80211_SEND_MGMT(ni, arg ?
 359                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 360                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 361                         }
 362                         break;
 363                 default:
 364                         goto invalid;
 365                 }
 366                 break;
 367         case IEEE80211_S_RUN:
 368                 if (vap->iv_flags & IEEE80211_F_WPA) {
 369                         /* XXX validate prerequisites */
 370                 }
 371                 switch (ostate) {
 372                 case IEEE80211_S_RUN:
 373                 case IEEE80211_S_CSA:
 374                         break;
 375                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 376                 case IEEE80211_S_ASSOC:
 377 #ifdef IEEE80211_DEBUG
 378                         if (ieee80211_msg_debug(vap)) {
 379                                 ieee80211_note(vap, "%s with %s ssid ",
 380                                     (vap->iv_opmode == IEEE80211_M_STA ?
 381                                     "associated" : "synchronized"),
 382                                     kether_ntoa(ni->ni_bssid, ethstr));
 383                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 384                                     ni->ni_esslen);
 385                                 /* XXX MCS/HT */
 386                                 kprintf(" channel %d start %uMb\n",
 387                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 388                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 389                         }
 390 #endif
 391                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 392                         ieee80211_notify_node_join(ni,
 393                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 394                         break;
 395                 case IEEE80211_S_SLEEP:
 396                         ieee80211_sta_pwrsave(vap, 0);
 397                         break;
 398                 default:
 399                         goto invalid;
 400                 }
 401                 ieee80211_sync_curchan(ic);
 402                 if (ostate != IEEE80211_S_RUN &&
 403                     (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
 404                         /*
 405                          * Start s/w beacon miss timer for devices w/o
 406                          * hardware support.  We fudge a bit here since
 407                          * we're doing this in software.
 408                          */
 409                         vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 410                                 2 * vap->iv_bmissthreshold * ni->ni_intval);
 411                         vap->iv_swbmiss_count = 0;
 412                         callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 413                                       ieee80211_swbmiss_callout, vap);
 414                 }
 415                 /*
 416                  * When 802.1x is not in use mark the port authorized
 417                  * at this point so traffic can flow.
 418                  */
 419                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 420                         ieee80211_node_authorize(ni);
 421                 /*
 422                  * Fake association when joining an existing bss.
 423                  */
 424                 if (ic->ic_newassoc != NULL)
 425                         ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
 426                 break;
 427         case IEEE80211_S_CSA:
 428                 if (ostate != IEEE80211_S_RUN)
 429                         goto invalid;
 430                 break;
 431         case IEEE80211_S_SLEEP:
 432                 ieee80211_sta_pwrsave(vap, 1);
 433                 break;
 434         default:
 435         invalid:
 436                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 437                     "%s: unexpected state transition %s -> %s\n", __func__,
 438                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 439                 break;
 440         }
 441         return 0;
 442 }
 443
 444 /*
 445  * Return non-zero if the frame is an echo of a multicast
 446  * frame sent by ourself.  The dir is known to be DSTODS.
 447  */
 448 static __inline int
 449 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 450 {
 451 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 452 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 453         const uint8_t *sa;
 454
 455         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 456
 457         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 458                 return 0;
 459         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 460         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 461 #undef WH4
 462 #undef QWH4
 463 }
 464
 465 /*
 466  * Return non-zero if the frame is an echo of a multicast
 467  * frame sent by ourself.  The dir is known to be FROMDS.
 468  */
 469 static __inline int
 470 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 471 {
 472         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 473
 474         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 475                 return 0;
 476         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 477 }
 478
 479 /*
 480  * Decide if a received management frame should be
 481  * printed when debugging is enabled.  This filters some
 482  * of the less interesting frames that come frequently
 483  * (e.g. beacons).
 484  */
 485 static __inline int
 486 doprint(struct ieee80211vap *vap, int subtype)
 487 {
 488         switch (subtype) {
 489         case IEEE80211_FC0_SUBTYPE_BEACON:
 490                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 491         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 492                 return 0;
 493         }
 494         return 1;
 495 }
 496
 497 /*
 498  * Process a received frame.  The node associated with the sender
 499  * should be supplied.  If nothing was found in the node table then
 500  * the caller is assumed to supply a reference to iv_bss instead.
 501  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 502  * during AP scanning to select a AP to associate with; it can have
 503  * any units so long as values have consistent units and higher values
 504  * mean ``better signal''.  The receive timestamp is currently not used
 505  * by the 802.11 layer.
 506  */
 507 static int
 508 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 509 {
 510 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 511 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 512         struct ieee80211vap *vap = ni->ni_vap;
 513         struct ieee80211com *ic = ni->ni_ic;
 514         struct ifnet *ifp = vap->iv_ifp;
 515         struct ieee80211_frame *wh;
 516         struct ieee80211_key *key;
 517         struct ether_header *eh;
 518         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 519         uint8_t dir, type, subtype, qos;
 520         uint8_t *bssid;
 521         uint16_t rxseq;
 522 #ifdef IEEE80211_DEBUG
 523         char ethstr[ETHER_ADDRSTRLEN + 1];
 524 #endif
 525
 526         if (m->m_flags & M_AMPDU_MPDU) {
 527                 /*
 528                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 529                  * w/ M_AMPDU_MPDU marked have already passed through
 530                  * here but were received out of order and been held on
 531                  * the reorder queue.  When resubmitted they are marked
 532                  * with the M_AMPDU_MPDU flag and we can bypass most of
 533                  * the normal processing.
 534                  */
 535                 wh = mtod(m, struct ieee80211_frame *);
 536                 type = IEEE80211_FC0_TYPE_DATA;
 537                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 538                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 539                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 540                 goto resubmit_ampdu;
 541         }
 542
 543         KASSERT(ni != NULL, ("null node"));
 544         ni->ni_inact = ni->ni_inact_reload;
 545
 546         type = -1;                      /* undefined */
 547
 548         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 549                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 550                     ni->ni_macaddr, NULL,
 551                     "too short (1): len %u", m->m_pkthdr.len);
 552                 vap->iv_stats.is_rx_tooshort++;
 553                 goto out;
 554         }
 555         /*
 556          * Bit of a cheat here, we use a pointer for a 3-address
 557          * frame format but don't reference fields past outside
 558          * ieee80211_frame_min w/o first validating the data is
 559          * present.
 560          */
 561         wh = mtod(m, struct ieee80211_frame *);
 562
 563         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 564             IEEE80211_FC0_VERSION_0) {
 565                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 566                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 567                     wh->i_fc[0], wh->i_fc[1]);
 568                 vap->iv_stats.is_rx_badversion++;
 569                 goto err;
 570         }
 571
 572         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 573         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 574         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 575         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 576                 bssid = wh->i_addr2;
 577                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 578                         /* not interested in */
 579                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 580                             bssid, NULL, "%s", "not to bss");
 581                         vap->iv_stats.is_rx_wrongbss++;
 582                         goto out;
 583                 }
 584                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 585                 ni->ni_noise = nf;
 586                 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 587                         uint8_t tid = ieee80211_gettid(wh);
 588                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 589                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 590                                 ic->ic_wme.wme_hipri_traffic++;
 591                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 592                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 593                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 594                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 595                                 /* duplicate, discard */
 596                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 597                                     bssid, "duplicate",
 598                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 599                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 600                                     ni->ni_rxseqs[tid] >>
 601                                         IEEE80211_SEQ_SEQ_SHIFT,
 602                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 603                                     ni->ni_rxseqs[tid] &
 604                                         IEEE80211_SEQ_FRAG_MASK,
 605                                     tid);
 606                                 vap->iv_stats.is_rx_dup++;
 607                                 IEEE80211_NODE_STAT(ni, rx_dup);
 608                                 goto out;
 609                         }
 610                         ni->ni_rxseqs[tid] = rxseq;
 611                 }
 612         }
 613
 614         switch (type) {
 615         case IEEE80211_FC0_TYPE_DATA:
 616                 hdrspace = ieee80211_hdrspace(ic, wh);
 617                 if (m->m_len < hdrspace &&
 618                     (m = m_pullup(m, hdrspace)) == NULL) {
 619                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 620                             ni->ni_macaddr, NULL,
 621                             "data too short: expecting %u", hdrspace);
 622                         vap->iv_stats.is_rx_tooshort++;
 623                         goto out;               /* XXX */
 624                 }
 625                 /*
 626                  * Handle A-MPDU re-ordering.  If the frame is to be
 627                  * processed directly then ieee80211_ampdu_reorder
 628                  * will return 0; otherwise it has consumed the mbuf
 629                  * and we should do nothing more with it.
 630                  */
 631                 if ((m->m_flags & M_AMPDU) &&
 632                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 633                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 634                     ieee80211_ampdu_reorder(ni, m) != 0) {
 635                         m = NULL;
 636                         goto out;
 637                 }
 638         resubmit_ampdu:
 639                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 640                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 641                             isfromds_mcastecho(vap, wh)) {
 642                                 /*
 643                                  * In IEEE802.11 network, multicast
 644                                  * packets sent from "me" are broadcast
 645                                  * from the AP; silently discard for
 646                                  * SIMPLEX interface.
 647                                  */
 648                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 649                                     wh, "data", "%s", "multicast echo");
 650                                 vap->iv_stats.is_rx_mcastecho++;
 651                                 goto out;
 652                         }
 653                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 654                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 655                                 /*
 656                                  * DWDS sta's must drop 3-address mcast frames
 657                                  * as they will be sent separately as a 4-addr
 658                                  * frame.  Accepting the 3-addr frame will
 659                                  * confuse the bridge into thinking the sending
 660                                  * sta is located at the end of WDS link.
 661                                  */
 662                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 663                                     "3-address data", "%s", "DWDS enabled");
 664                                 vap->iv_stats.is_rx_mcastecho++;
 665                                 goto out;
 666                         }
 667                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 668                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 669                                 IEEE80211_DISCARD(vap,
 670                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 671                                     "%s", "DWDS not enabled");
 672                                 vap->iv_stats.is_rx_wrongdir++;
 673                                 goto out;
 674                         }
 675                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 676                             isdstods_mcastecho(vap, wh)) {
 677                                 /*
 678                                  * In IEEE802.11 network, multicast
 679                                  * packets sent from "me" are broadcast
 680                                  * from the AP; silently discard for
 681                                  * SIMPLEX interface.
 682                                  */
 683                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 684                                     "4-address data", "%s", "multicast echo");
 685                                 vap->iv_stats.is_rx_mcastecho++;
 686                                 goto out;
 687                         }
 688                 } else {
 689                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 690                             "data", "incorrect dir 0x%x", dir);
 691                         vap->iv_stats.is_rx_wrongdir++;
 692                         goto out;
 693                 }
 694
 695                 /*
 696                  * Handle privacy requirements.  Note that we
 697                  * must not be preempted from here until after
 698                  * we (potentially) call ieee80211_crypto_demic;
 699                  * otherwise we may violate assumptions in the
 700                  * crypto cipher modules used to do delayed update
 701                  * of replay sequence numbers.
 702                  */
 703                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 704                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 705                                 /*
 706                                  * Discard encrypted frames when privacy is off.
 707                                  */
 708                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 709                                     wh, "WEP", "%s", "PRIVACY off");
 710                                 vap->iv_stats.is_rx_noprivacy++;
 711                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 712                                 goto out;
 713                         }
 714                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 715                         if (key == NULL) {
 716                                 /* NB: stats+msgs handled in crypto_decap */
 717                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 718                                 goto out;
 719                         }
 720                         wh = mtod(m, struct ieee80211_frame *);
 721                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 722                 } else {
 723                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 724                         key = NULL;
 725                 }
 726
 727                 /*
 728                  * Save QoS bits for use below--before we strip the header.
 729                  */
 730                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 731                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 732                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 733                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 734                 } else
 735                         qos = 0;
 736
 737                 /*
 738                  * Next up, any fragmentation.
 739                  */
 740                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 741                         m = ieee80211_defrag(ni, m, hdrspace);
 742                         if (m == NULL) {
 743                                 /* Fragment dropped or frame not complete yet */
 744                                 goto out;
 745                         }
 746                 }
 747                 wh = NULL;              /* no longer valid, catch any uses */
 748
 749                 /*
 750                  * Next strip any MSDU crypto bits.
 751                  */
 752                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 753                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 754                             ni->ni_macaddr, "data", "%s", "demic error");
 755                         vap->iv_stats.is_rx_demicfail++;
 756                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 757                         goto out;
 758                 }
 759
 760                 /* copy to listener after decrypt */
 761                 if (ieee80211_radiotap_active_vap(vap))
 762                         ieee80211_radiotap_rx(vap, m);
 763                 need_tap = 0;
 764
 765                 /*
 766                  * Finally, strip the 802.11 header.
 767                  */
 768                 m = ieee80211_decap(vap, m, hdrspace);
 769                 if (m == NULL) {
 770                         /* XXX mask bit to check for both */
 771                         /* don't count Null data frames as errors */
 772                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 773                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 774                                 goto out;
 775                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 776                             ni->ni_macaddr, "data", "%s", "decap error");
 777                         vap->iv_stats.is_rx_decap++;
 778                         IEEE80211_NODE_STAT(ni, rx_decap);
 779                         goto err;
 780                 }
 781                 eh = mtod(m, struct ether_header *);
 782                 if (!ieee80211_node_is_authorized(ni)) {
 783                         /*
 784                          * Deny any non-PAE frames received prior to
 785                          * authorization.  For open/shared-key
 786                          * authentication the port is mark authorized
 787                          * after authentication completes.  For 802.1x
 788                          * the port is not marked authorized by the
 789                          * authenticator until the handshake has completed.
 790                          */
 791                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 792                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 793                                     eh->ether_shost, "data",
 794                                     "unauthorized port: ether type 0x%x len %u",
 795                                     eh->ether_type, m->m_pkthdr.len);
 796                                 vap->iv_stats.is_rx_unauth++;
 797                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 798                                 goto err;
 799                         }
 800                 } else {
 801                         /*
 802                          * When denying unencrypted frames, discard
 803                          * any non-PAE frames received without encryption.
 804                          */
 805                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 806                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 807                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 808                                 /*
 809                                  * Drop unencrypted frames.
 810                                  */
 811                                 vap->iv_stats.is_rx_unencrypted++;
 812                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 813                                 goto out;
 814                         }
 815                 }
 816                 /* XXX require HT? */
 817                 if (qos & IEEE80211_QOS_AMSDU) {
 818                         m = ieee80211_decap_amsdu(ni, m);
 819                         if (m == NULL)
 820                                 return IEEE80211_FC0_TYPE_DATA;
 821                 } else {
 822 #ifdef IEEE80211_SUPPORT_SUPERG
 823                         m = ieee80211_decap_fastframe(vap, ni, m);
 824                         if (m == NULL)
 825                                 return IEEE80211_FC0_TYPE_DATA;
 826 #endif
 827                 }
 828                 ieee80211_deliver_data(vap, ni, m);
 829                 return IEEE80211_FC0_TYPE_DATA;
 830
 831         case IEEE80211_FC0_TYPE_MGT:
 832                 vap->iv_stats.is_rx_mgmt++;
 833                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 834                 if (dir != IEEE80211_FC1_DIR_NODS) {
 835                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 836                             wh, "data", "incorrect dir 0x%x", dir);
 837                         vap->iv_stats.is_rx_wrongdir++;
 838                         goto err;
 839                 }
 840                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 841                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 842                             ni->ni_macaddr, "mgt", "too short: len %u",
 843                             m->m_pkthdr.len);
 844                         vap->iv_stats.is_rx_tooshort++;
 845                         goto out;
 846                 }
 847 #ifdef IEEE80211_DEBUG
 848                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 849                     ieee80211_msg_dumppkts(vap)) {
 850                         if_printf(ifp, "received %s from %s rssi %d\n",
 851                             ieee80211_mgt_subtype_name[subtype >>
 852                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 853                             kether_ntoa(wh->i_addr2, ethstr), rssi);
 854                 }
 855 #endif
 856                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 857                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 858                                 /*
 859                                  * Only shared key auth frames with a challenge
 860                                  * should be encrypted, discard all others.
 861                                  */
 862                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 863                                     wh, ieee80211_mgt_subtype_name[subtype >>
 864                                         IEEE80211_FC0_SUBTYPE_SHIFT],
 865                                     "%s", "WEP set but not permitted");
 866                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 867                                 goto out;
 868                         }
 869                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 870                                 /*
 871                                  * Discard encrypted frames when privacy is off.
 872                                  */
 873                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 874                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 875                                 vap->iv_stats.is_rx_noprivacy++;
 876                                 goto out;
 877                         }
 878                         hdrspace = ieee80211_hdrspace(ic, wh);
 879                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 880                         if (key == NULL) {
 881                                 /* NB: stats+msgs handled in crypto_decap */
 882                                 goto out;
 883                         }
 884                         wh = mtod(m, struct ieee80211_frame *);
 885                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 886                 }
 887                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 888                 goto out;
 889
 890         case IEEE80211_FC0_TYPE_CTL:
 891                 vap->iv_stats.is_rx_ctl++;
 892                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 893                 vap->iv_recv_ctl(ni, m, subtype);
 894                 goto out;
 895
 896         default:
 897                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 898                     wh, NULL, "bad frame type 0x%x", type);
 899                 /* should not come here */
 900                 break;
 901         }
 902 err:
 903         IFNET_STAT_INC(ifp, ierrors, 1);
 904 out:
 905         if (m != NULL) {
 906                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 907                         ieee80211_radiotap_rx(vap, m);
 908                 m_freem(m);
 909         }
 910         return type;
 911 #undef SEQ_LEQ
 912 }
 913
 914 static void
 915 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 916     int rssi, int nf, uint16_t seq, uint16_t status)
 917 {
 918         struct ieee80211vap *vap = ni->ni_vap;
 919
 920         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 921                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 922                     ni->ni_macaddr, "open auth",
 923                     "bad sta auth mode %u", ni->ni_authmode);
 924                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 925                 return;
 926         }
 927         if (vap->iv_state != IEEE80211_S_AUTH ||
 928             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
 929                 vap->iv_stats.is_rx_bad_auth++;
 930                 return;
 931         }
 932         if (status != 0) {
 933                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 934                     ni, "open auth failed (reason %d)", status);
 935                 vap->iv_stats.is_rx_auth_fail++;
 936                 vap->iv_stats.is_rx_authfail_code = status;
 937                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 938                     IEEE80211_SCAN_FAIL_STATUS);
 939         } else
 940                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 941 }
 942
 943 static void
 944 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 945     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 946     uint16_t seq, uint16_t status)
 947 {
 948         struct ieee80211vap *vap = ni->ni_vap;
 949         uint8_t *challenge;
 950
 951         /*
 952          * NB: this can happen as we allow pre-shared key
 953          * authentication to be enabled w/o wep being turned
 954          * on so that configuration of these can be done
 955          * in any order.  It may be better to enforce the
 956          * ordering in which case this check would just be
 957          * for sanity/consistency.
 958          */
 959         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 960                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 961                     ni->ni_macaddr, "shared key auth",
 962                     "%s", " PRIVACY is disabled");
 963                 goto bad;
 964         }
 965         /*
 966          * Pre-shared key authentication is evil; accept
 967          * it only if explicitly configured (it is supported
 968          * mainly for compatibility with clients like OS X).
 969          */
 970         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
 971             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
 972                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 973                     ni->ni_macaddr, "shared key auth",
 974                     "bad sta auth mode %u", ni->ni_authmode);
 975                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
 976                 goto bad;
 977         }
 978
 979         challenge = NULL;
 980         if (frm + 1 < efrm) {
 981                 if ((frm[1] + 2) > (efrm - frm)) {
 982                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 983                             ni->ni_macaddr, "shared key auth",
 984                             "ie %d/%d too long",
 985                             frm[0], (int)((frm[1] + 2) - (efrm - frm)));
 986                         vap->iv_stats.is_rx_bad_auth++;
 987                         goto bad;
 988                 }
 989                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
 990                         challenge = frm;
 991                 frm += frm[1] + 2;
 992         }
 993         switch (seq) {
 994         case IEEE80211_AUTH_SHARED_CHALLENGE:
 995         case IEEE80211_AUTH_SHARED_RESPONSE:
 996                 if (challenge == NULL) {
 997                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 998                             ni->ni_macaddr, "shared key auth",
 999                             "%s", "no challenge");
1000                         vap->iv_stats.is_rx_bad_auth++;
1001                         goto bad;
1002                 }
1003                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1004                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1005                             ni->ni_macaddr, "shared key auth",
1006                             "bad challenge len %d", challenge[1]);
1007                         vap->iv_stats.is_rx_bad_auth++;
1008                         goto bad;
1009                 }
1010         default:
1011                 break;
1012         }
1013         if (vap->iv_state != IEEE80211_S_AUTH)
1014                 return;
1015         switch (seq) {
1016         case IEEE80211_AUTH_SHARED_PASS:
1017                 if (ni->ni_challenge != NULL) {
1018                         kfree(ni->ni_challenge, M_80211_NODE);
1019                         ni->ni_challenge = NULL;
1020                 }
1021                 if (status != 0) {
1022                         IEEE80211_NOTE_FRAME(vap,
1023                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1024                             "shared key auth failed (reason %d)", status);
1025                         vap->iv_stats.is_rx_auth_fail++;
1026                         vap->iv_stats.is_rx_authfail_code = status;
1027                         return;
1028                 }
1029                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1030                 break;
1031         case IEEE80211_AUTH_SHARED_CHALLENGE:
1032                 if (!ieee80211_alloc_challenge(ni))
1033                         return;
1034                 /* XXX could optimize by passing recvd challenge */
1035                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1036                 IEEE80211_SEND_MGMT(ni,
1037                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1038                 break;
1039         default:
1040                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1041                     wh, "shared key auth", "bad seq %d", seq);
1042                 vap->iv_stats.is_rx_bad_auth++;
1043                 return;
1044         }
1045         return;
1046 bad:
1047         /*
1048          * Kick the state machine.  This short-circuits
1049          * using the mgt frame timeout to trigger the
1050          * state transition.
1051          */
1052         if (vap->iv_state == IEEE80211_S_AUTH)
1053                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1054                     IEEE80211_SCAN_FAIL_STATUS);
1055 }
1056
1057 static int
1058 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1059         const struct ieee80211_frame *wh)
1060 {
1061 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1062         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1063         u_int len = frm[1], qosinfo;
1064         int i;
1065
1066         if (len < sizeof(struct ieee80211_wme_param)-2) {
1067                 IEEE80211_DISCARD_IE(vap,
1068                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1069                     wh, "WME", "too short, len %u", len);
1070                 return -1;
1071         }
1072         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1073         qosinfo &= WME_QOSINFO_COUNT;
1074         /* XXX do proper check for wraparound */
1075         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1076                 return 0;
1077         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1078         for (i = 0; i < WME_NUM_AC; i++) {
1079                 struct wmeParams *wmep =
1080                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1081                 /* NB: ACI not used */
1082                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1083                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1084                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1085                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1086                 wmep->wmep_txopLimit = LE_READ_2(frm+2);
1087                 frm += 4;
1088         }
1089         wme->wme_wmeChanParams.cap_info = qosinfo;
1090         return 1;
1091 #undef MS
1092 }
1093
1094 /*
1095  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1096  * is the first CSA then initiate the switch.  Otherwise we
1097  * track state and trigger completion and/or cancel of the switch.
1098  * XXX should be public for IBSS use
1099  */
1100 static void
1101 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1102         const struct ieee80211_frame *wh)
1103 {
1104         struct ieee80211com *ic = vap->iv_ic;
1105         const struct ieee80211_csa_ie *csa =
1106             (const struct ieee80211_csa_ie *) frm;
1107
1108         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1109             ("state %s", ieee80211_state_name[vap->iv_state]));
1110
1111         if (csa->csa_mode > 1) {
1112                 IEEE80211_DISCARD_IE(vap,
1113                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1114                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1115                 return;
1116         }
1117         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1118                 /*
1119                  * Convert the channel number to a channel reference.  We
1120                  * try first to preserve turbo attribute of the current
1121                  * channel then fallback.  Note this will not work if the
1122                  * CSA specifies a channel that requires a band switch (e.g.
1123                  * 11a => 11g).  This is intentional as 11h is defined only
1124                  * for 5GHz/11a and because the switch does not involve a
1125                  * reassociation, protocol state (capabilities, negotated
1126                  * rates, etc) may/will be wrong.
1127                  */
1128                 struct ieee80211_channel *c =
1129                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1130                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1131                 if (c == NULL) {
1132                         c = ieee80211_find_channel_byieee(ic,
1133                             csa->csa_newchan,
1134                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1135                         if (c == NULL) {
1136                                 IEEE80211_DISCARD_IE(vap,
1137                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1138                                     wh, "CSA", "invalid channel %u",
1139                                     csa->csa_newchan);
1140                                 goto done;
1141                         }
1142                 }
1143 #if IEEE80211_CSA_COUNT_MIN > 0
1144                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1145                         /*
1146                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1147                          * reduce the risk of being redirected by a fabricated
1148                          * CSA.  If a valid CSA is dropped we'll still get a
1149                          * beacon miss when the AP leaves the channel so we'll
1150                          * eventually follow to the new channel.
1151                          *
1152                          * NOTE: this violates the 11h spec that states that
1153                          * count may be any value and if 0 then a switch
1154                          * should happen asap.
1155                          */
1156                         IEEE80211_DISCARD_IE(vap,
1157                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1158                             wh, "CSA", "count %u too small, must be >= %u",
1159                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1160                         goto done;
1161                 }
1162 #endif
1163                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1164         } else {
1165                 /*
1166                  * Validate this ie against the initial CSA.  We require
1167                  * mode and channel not change and the count must be
1168                  * monotonically decreasing.  This may be pointless and
1169                  * canceling the switch as a result may be too paranoid but
1170                  * in the worst case if we drop out of CSA because of this
1171                  * and the AP does move then we'll just end up taking a
1172                  * beacon miss and scan to find the AP.
1173                  *
1174                  * XXX may want <= on count as we also process ProbeResp
1175                  * frames and those may come in w/ the same count as the
1176                  * previous beacon; but doing so leaves us open to a stuck
1177                  * count until we add a dead-man timer
1178                  */
1179                 if (!(csa->csa_count < ic->ic_csa_count &&
1180                       csa->csa_mode == ic->ic_csa_mode &&
1181                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1182                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1183                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1184                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1185                             ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count,
1186                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1187                         ieee80211_csa_cancelswitch(ic);
1188                 } else {
1189                         if (csa->csa_count <= 1)
1190                                 ieee80211_csa_completeswitch(ic);
1191                         else
1192                                 ic->ic_csa_count = csa->csa_count;
1193                 }
1194         }
1195 done:
1196         ;
1197 }
1198
1199 /*
1200  * Return non-zero if a background scan may be continued:
1201  * o bg scan is active
1202  * o no channel switch is pending
1203  * o there has not been any traffic recently
1204  *
1205  * Note we do not check if there is an administrative enable;
1206  * this is only done to start the scan.  We assume that any
1207  * change in state will be accompanied by a request to cancel
1208  * active scans which will otherwise cause this test to fail.
1209  */
1210 static __inline int
1211 contbgscan(struct ieee80211vap *vap)
1212 {
1213         struct ieee80211com *ic = vap->iv_ic;
1214
1215         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1216             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1217             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1218             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1219 }
1220
1221 /*
1222  * Return non-zero if a backgrond scan may be started:
1223  * o bg scanning is administratively enabled
1224  * o no channel switch is pending
1225  * o we are not boosted on a dynamic turbo channel
1226  * o there has not been a scan recently
1227  * o there has not been any traffic recently
1228  */
1229 static __inline int
1230 startbgscan(struct ieee80211vap *vap)
1231 {
1232         struct ieee80211com *ic = vap->iv_ic;
1233
1234         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1235             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1236 #ifdef IEEE80211_SUPPORT_SUPERG
1237             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1238 #endif
1239             time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1240             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1241 }
1242
1243 static void
1244 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1245         int subtype, int rssi, int nf)
1246 {
1247 #define ISPROBE(_st)    ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1248 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1249         struct ieee80211vap *vap = ni->ni_vap;
1250         struct ieee80211com *ic = ni->ni_ic;
1251         struct ieee80211_frame *wh;
1252         uint8_t *frm, *efrm;
1253         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1254         uint8_t rate;
1255
1256         wh = mtod(m0, struct ieee80211_frame *);
1257         frm = (uint8_t *)&wh[1];
1258         efrm = mtod(m0, uint8_t *) + m0->m_len;
1259         switch (subtype) {
1260         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1261         case IEEE80211_FC0_SUBTYPE_BEACON: {
1262                 struct ieee80211_scanparams scan;
1263                 /*
1264                  * We process beacon/probe response frames:
1265                  *    o when scanning, or
1266                  *    o station mode when associated (to collect state
1267                  *      updates such as 802.11g slot time)
1268                  * Frames otherwise received are discarded.
1269                  */
1270                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1271                         vap->iv_stats.is_rx_mgtdiscard++;
1272                         return;
1273                 }
1274                 /* XXX probe response in sta mode when !scanning? */
1275                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
1276                         return;
1277                 /*
1278                  * Count frame now that we know it's to be processed.
1279                  */
1280                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1281                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1282                         IEEE80211_NODE_STAT(ni, rx_beacons);
1283                 } else
1284                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1285                 /*
1286                  * When operating in station mode, check for state updates.
1287                  * Be careful to ignore beacons received while doing a
1288                  * background scan.  We consider only 11g/WMM stuff right now.
1289                  */
1290                 if (ni->ni_associd != 0 &&
1291                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1292                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1293                         /* record tsf of last beacon */
1294                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1295                                 sizeof(ni->ni_tstamp));
1296                         /* count beacon frame for s/w bmiss handling */
1297                         vap->iv_swbmiss_count++;
1298                         vap->iv_bmiss_count = 0;
1299                         if (ni->ni_erp != scan.erp) {
1300                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1301                                     wh->i_addr2,
1302                                     "erp change: was 0x%x, now 0x%x",
1303                                     ni->ni_erp, scan.erp);
1304                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1305                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1306                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1307                                 else
1308                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1309                                 ni->ni_erp = scan.erp;
1310                                 /* XXX statistic */
1311                                 /* XXX driver notification */
1312                         }
1313                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1314                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1315                                     wh->i_addr2,
1316                                     "capabilities change: was 0x%x, now 0x%x",
1317                                     ni->ni_capinfo, scan.capinfo);
1318                                 /*
1319                                  * NB: we assume short preamble doesn't
1320                                  *     change dynamically
1321                                  */
1322                                 ieee80211_set_shortslottime(ic,
1323                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1324                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1325                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1326                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1327                                 /* XXX statistic */
1328                         }
1329                         if (scan.wme != NULL &&
1330                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1331                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1332                                 ieee80211_wme_updateparams(vap);
1333 #ifdef IEEE80211_SUPPORT_SUPERG
1334                         if (scan.ath != NULL)
1335                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1336 #endif
1337                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1338                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1339                                 ieee80211_ht_updateparams(ni,
1340                                     scan.htcap, scan.htinfo);
1341                                 /* XXX state changes? */
1342                         }
1343                         if (scan.tim != NULL) {
1344                                 struct ieee80211_tim_ie *tim =
1345                                     (struct ieee80211_tim_ie *) scan.tim;
1346 #if 0
1347                                 int aid = IEEE80211_AID(ni->ni_associd);
1348                                 int ix = aid / NBBY;
1349                                 int min = tim->tim_bitctl &~ 1;
1350                                 int max = tim->tim_len + min - 4;
1351                                 if ((tim->tim_bitctl&1) ||
1352                                     (min <= ix && ix <= max &&
1353                                      isset(tim->tim_bitmap - min, aid))) {
1354                                         /*
1355                                          * XXX Do not let bg scan kick off
1356                                          * we are expecting data.
1357                                          */
1358                                         ic->ic_lastdata = ticks;
1359                                         ieee80211_sta_pwrsave(vap, 0);
1360                                 }
1361 #endif
1362                                 ni->ni_dtim_count = tim->tim_count;
1363                                 ni->ni_dtim_period = tim->tim_period;
1364                         }
1365                         if (scan.csa != NULL &&
1366                             (vap->iv_flags & IEEE80211_F_DOTH))
1367                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1368                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1369                                 /*
1370                                  * No CSA ie or 11h disabled, but a channel
1371                                  * switch is pending; drop out so we aren't
1372                                  * stuck in CSA state.  If the AP really is
1373                                  * moving we'll get a beacon miss and scan.
1374                                  */
1375                                 ieee80211_csa_cancelswitch(ic);
1376                         }
1377                         /*
1378                          * If scanning, pass the info to the scan module.
1379                          * Otherwise, check if it's the right time to do
1380                          * a background scan.  Background scanning must
1381                          * be enabled and we must not be operating in the
1382                          * turbo phase of dynamic turbo mode.  Then,
1383                          * it's been a while since the last background
1384                          * scan and if no data frames have come through
1385                          * recently, kick off a scan.  Note that this
1386                          * is the mechanism by which a background scan
1387                          * is started _and_ continued each time we
1388                          * return on-channel to receive a beacon from
1389                          * our ap.
1390                          */
1391                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1392                                 ieee80211_add_scan(vap, &scan, wh,
1393                                         subtype, rssi, nf);
1394                         } else if (contbgscan(vap)) {
1395                                 ieee80211_bg_scan(vap, 0);
1396                         } else if (startbgscan(vap)) {
1397                                 vap->iv_stats.is_scan_bg++;
1398 #if 0
1399                                 /* wakeup if we are sleeing */
1400                                 ieee80211_set_pwrsave(vap, 0);
1401 #endif
1402                                 ieee80211_bg_scan(vap, 0);
1403                         }
1404                         return;
1405                 }
1406                 /*
1407                  * If scanning, just pass information to the scan module.
1408                  */
1409                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1410                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1411                                 /*
1412                                  * Actively scanning a channel marked passive;
1413                                  * send a probe request now that we know there
1414                                  * is 802.11 traffic present.
1415                                  *
1416                                  * XXX check if the beacon we recv'd gives
1417                                  * us what we need and suppress the probe req
1418                                  */
1419                                 ieee80211_probe_curchan(vap, 1);
1420                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1421                         }
1422                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1423                         return;
1424                 }
1425                 break;
1426         }
1427
1428         case IEEE80211_FC0_SUBTYPE_AUTH: {
1429                 uint16_t algo, seq, status;
1430                 /*
1431                  * auth frame format
1432                  *      [2] algorithm
1433                  *      [2] sequence
1434                  *      [2] status
1435                  *      [tlv*] challenge
1436                  */
1437                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1438                 algo   = le16toh(*(uint16_t *)frm);
1439                 seq    = le16toh(*(uint16_t *)(frm + 2));
1440                 status = le16toh(*(uint16_t *)(frm + 4));
1441                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1442                     "recv auth frame with algorithm %d seq %d", algo, seq);
1443
1444                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1445                         IEEE80211_DISCARD(vap,
1446                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1447                             wh, "auth", "%s", "TKIP countermeasures enabled");
1448                         vap->iv_stats.is_rx_auth_countermeasures++;
1449                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1450                                 ieee80211_send_error(ni, wh->i_addr2,
1451                                         IEEE80211_FC0_SUBTYPE_AUTH,
1452                                         IEEE80211_REASON_MIC_FAILURE);
1453                         }
1454                         return;
1455                 }
1456                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1457                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1458                             seq, status);
1459                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1460                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1461                 else {
1462                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1463                             wh, "auth", "unsupported alg %d", algo);
1464                         vap->iv_stats.is_rx_auth_unsupported++;
1465                         return;
1466                 }
1467                 break;
1468         }
1469
1470         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1471         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1472                 uint16_t capinfo, associd;
1473                 uint16_t status;
1474
1475                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1476                         vap->iv_stats.is_rx_mgtdiscard++;
1477                         return;
1478                 }
1479
1480                 /*
1481                  * asresp frame format
1482                  *      [2] capability information
1483                  *      [2] status
1484                  *      [2] association ID
1485                  *      [tlv] supported rates
1486                  *      [tlv] extended supported rates
1487                  *      [tlv] WME
1488                  *      [tlv] HT capabilities
1489                  *      [tlv] HT info
1490                  */
1491                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1492                 ni = vap->iv_bss;
1493                 capinfo = le16toh(*(uint16_t *)frm);
1494                 frm += 2;
1495                 status = le16toh(*(uint16_t *)frm);
1496                 frm += 2;
1497                 if (status != 0) {
1498                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1499                             wh->i_addr2, "%sassoc failed (reason %d)",
1500                             ISREASSOC(subtype) ?  "re" : "", status);
1501                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1502                         return;
1503                 }
1504                 associd = le16toh(*(uint16_t *)frm);
1505                 frm += 2;
1506
1507                 rates = xrates = wme = htcap = htinfo = NULL;
1508                 while (efrm - frm > 1) {
1509                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1510                         switch (*frm) {
1511                         case IEEE80211_ELEMID_RATES:
1512                                 rates = frm;
1513                                 break;
1514                         case IEEE80211_ELEMID_XRATES:
1515                                 xrates = frm;
1516                                 break;
1517                         case IEEE80211_ELEMID_HTCAP:
1518                                 htcap = frm;
1519                                 break;
1520                         case IEEE80211_ELEMID_HTINFO:
1521                                 htinfo = frm;
1522                                 break;
1523                         case IEEE80211_ELEMID_VENDOR:
1524                                 if (iswmeoui(frm))
1525                                         wme = frm;
1526                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1527                                         /*
1528                                          * Accept pre-draft HT ie's if the
1529                                          * standard ones have not been seen.
1530                                          */
1531                                         if (ishtcapoui(frm)) {
1532                                                 if (htcap == NULL)
1533                                                         htcap = frm;
1534                                         } else if (ishtinfooui(frm)) {
1535                                                 if (htinfo == NULL)
1536                                                         htcap = frm;
1537                                         }
1538                                 }
1539                                 /* XXX Atheros OUI support */
1540                                 break;
1541                         }
1542                         frm += frm[1] + 2;
1543                 }
1544
1545                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1546                 if (xrates != NULL)
1547                         IEEE80211_VERIFY_ELEMENT(xrates,
1548                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1549                 rate = ieee80211_setup_rates(ni, rates, xrates,
1550                                 IEEE80211_F_JOIN |
1551                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1552                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1553                 if (rate & IEEE80211_RATE_BASIC) {
1554                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1555                             wh->i_addr2,
1556                             "%sassoc failed (rate set mismatch)",
1557                             ISREASSOC(subtype) ?  "re" : "");
1558                         vap->iv_stats.is_rx_assoc_norate++;
1559                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1560                             IEEE80211_SCAN_FAIL_STATUS);
1561                         return;
1562                 }
1563
1564                 ni->ni_capinfo = capinfo;
1565                 ni->ni_associd = associd;
1566                 if (ni->ni_jointime == 0)
1567                         ni->ni_jointime = time_second;
1568                 if (wme != NULL &&
1569                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1570                         ni->ni_flags |= IEEE80211_NODE_QOS;
1571                         ieee80211_wme_updateparams(vap);
1572                 } else
1573                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1574                 /*
1575                  * Setup HT state according to the negotiation.
1576                  *
1577                  * NB: shouldn't need to check if HT use is enabled but some
1578                  *     ap's send back HT ie's even when we don't indicate we
1579                  *     are HT capable in our AssocReq.
1580                  */
1581                 if (htcap != NULL && htinfo != NULL &&
1582                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1583                         ieee80211_ht_node_init(ni);
1584                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1585                         ieee80211_setup_htrates(ni, htcap,
1586                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1587                         ieee80211_setup_basic_htrates(ni, htinfo);
1588                         ieee80211_node_setuptxparms(ni);
1589                 } else {
1590 #ifdef IEEE80211_SUPPORT_SUPERG
1591                         if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1592                                 ieee80211_ff_node_init(ni);
1593 #endif
1594                 }
1595                 /*
1596                  * Configure state now that we are associated.
1597                  *
1598                  * XXX may need different/additional driver callbacks?
1599                  */
1600                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1601                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1602                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1603                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1604                 } else {
1605                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1606                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1607                 }
1608                 ieee80211_set_shortslottime(ic,
1609                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1610                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1611                 /*
1612                  * Honor ERP protection.
1613                  *
1614                  * NB: ni_erp should zero for non-11g operation.
1615                  */
1616                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1617                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1618                         ic->ic_flags |= IEEE80211_F_USEPROT;
1619                 else
1620                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1621                 IEEE80211_NOTE_MAC(vap,
1622                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1623                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1624                     ISREASSOC(subtype) ? "re" : "",
1625                     IEEE80211_NODE_AID(ni),
1626                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1627                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1628                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1629                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1630                     ni->ni_flags & IEEE80211_NODE_HT ?
1631                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1632                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1633                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1634                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1635                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1636                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1637                         ", fast-frames" : "",
1638                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1639                         ", turbo" : ""
1640                 );
1641                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1642                 break;
1643         }
1644
1645         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1646                 uint16_t reason;
1647
1648                 if (vap->iv_state == IEEE80211_S_SCAN) {
1649                         vap->iv_stats.is_rx_mgtdiscard++;
1650                         return;
1651                 }
1652                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1653                         /* NB: can happen when in promiscuous mode */
1654                         vap->iv_stats.is_rx_mgtdiscard++;
1655                         break;
1656                 }
1657
1658                 /*
1659                  * deauth frame format
1660                  *      [2] reason
1661                  */
1662                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1663                 reason = le16toh(*(uint16_t *)frm);
1664
1665                 vap->iv_stats.is_rx_deauth++;
1666                 vap->iv_stats.is_rx_deauth_code = reason;
1667                 IEEE80211_NODE_STAT(ni, rx_deauth);
1668
1669                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1670                     "recv deauthenticate (reason %d)", reason);
1671                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1672                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1673                 break;
1674         }
1675
1676         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1677                 uint16_t reason;
1678
1679                 if (vap->iv_state != IEEE80211_S_RUN &&
1680                     vap->iv_state != IEEE80211_S_ASSOC &&
1681                     vap->iv_state != IEEE80211_S_AUTH) {
1682                         vap->iv_stats.is_rx_mgtdiscard++;
1683                         return;
1684                 }
1685                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1686                         /* NB: can happen when in promiscuous mode */
1687                         vap->iv_stats.is_rx_mgtdiscard++;
1688                         break;
1689                 }
1690
1691                 /*
1692                  * disassoc frame format
1693                  *      [2] reason
1694                  */
1695                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1696                 reason = le16toh(*(uint16_t *)frm);
1697
1698                 vap->iv_stats.is_rx_disassoc++;
1699                 vap->iv_stats.is_rx_disassoc_code = reason;
1700                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1701
1702                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1703                     "recv disassociate (reason %d)", reason);
1704                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1705                 break;
1706         }
1707
1708         case IEEE80211_FC0_SUBTYPE_ACTION:
1709                 if (vap->iv_state == IEEE80211_S_RUN) {
1710                         if (ieee80211_parse_action(ni, m0) == 0)
1711                                 ic->ic_recv_action(ni, wh, frm, efrm);
1712                 } else
1713                         vap->iv_stats.is_rx_mgtdiscard++;
1714                 break;
1715
1716         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1717         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1718         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1719                 vap->iv_stats.is_rx_mgtdiscard++;
1720                 return;
1721         default:
1722                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1723                      wh, "mgt", "subtype 0x%x not handled", subtype);
1724                 vap->iv_stats.is_rx_badsubtype++;
1725                 break;
1726         }
1727 #undef ISREASSOC
1728 #undef ISPROBE
1729 }
1730
1731 static void
1732 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
1733 {
1734 }