sys/net80211/ieee80211_sta.c

   1 /*-
   2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 Station mode support.
  33  */
  34 #include "opt_inet.h"
  35 #include "opt_wlan.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/malloc.h>
  41 #include <sys/kernel.h>
  42
  43 #include <sys/socket.h>
  44 #include <sys/sockio.h>
  45 #include <sys/endian.h>
  46 #include <sys/errno.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_media.h>
  52 #include <net/if_llc.h>
  53 #include <net/if_dl.h>
  54 #include <net/if_var.h>
  55 #include <net/ethernet.h>
  56
  57 #include <net/bpf.h>
  58
  59 #include <net80211/ieee80211_var.h>
  60 #include <net80211/ieee80211_sta.h>
  61 #include <net80211/ieee80211_input.h>
  62 #ifdef IEEE80211_SUPPORT_SUPERG
  63 #include <net80211/ieee80211_superg.h>
  64 #endif
  65 #include <net80211/ieee80211_ratectl.h>
  66 #include <net80211/ieee80211_sta.h>
  67
  68 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  69
  70 static  void sta_vattach(struct ieee80211vap *);
  71 static  void sta_beacon_miss(struct ieee80211vap *);
  72 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  73 static  int sta_input(struct ieee80211_node *, struct mbuf *,
  74             const struct ieee80211_rx_stats *, int, int);
  75 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  76             int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
  77 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  78
  79 void
  80 ieee80211_sta_attach(struct ieee80211com *ic)
  81 {
  82         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  83 }
  84
  85 void
  86 ieee80211_sta_detach(struct ieee80211com *ic)
  87 {
  88 }
  89
  90 static void
  91 sta_vdetach(struct ieee80211vap *vap)
  92 {
  93 }
  94
  95 static void
  96 sta_vattach(struct ieee80211vap *vap)
  97 {
  98         vap->iv_newstate = sta_newstate;
  99         vap->iv_input = sta_input;
 100         vap->iv_recv_mgmt = sta_recv_mgmt;
 101         vap->iv_recv_ctl = sta_recv_ctl;
 102         vap->iv_opdetach = sta_vdetach;
 103         vap->iv_bmiss = sta_beacon_miss;
 104 }
 105
 106 /*
 107  * Handle a beacon miss event.  The common code filters out
 108  * spurious events that can happen when scanning and/or before
 109  * reaching RUN state.
 110  */
 111 static void
 112 sta_beacon_miss(struct ieee80211vap *vap)
 113 {
 114         struct ieee80211com *ic = vap->iv_ic;
 115
 116         IEEE80211_LOCK_ASSERT(ic);
 117
 118         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 119         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 120             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 121
 122         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 123             "beacon miss, mode %s state %s\n",
 124             ieee80211_opmode_name[vap->iv_opmode],
 125             ieee80211_state_name[vap->iv_state]);
 126
 127         if (vap->iv_state == IEEE80211_S_CSA) {
 128                 /*
 129                  * A Channel Switch is pending; assume we missed the
 130                  * beacon that would've completed the process and just
 131                  * force the switch.  If we made a mistake we'll not
 132                  * find the AP on the new channel and fall back to a
 133                  * normal scan.
 134                  */
 135                 ieee80211_csa_completeswitch(ic);
 136                 return;
 137         }
 138         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 139                 /*
 140                  * Send a directed probe req before falling back to a
 141                  * scan; if we receive a response ic_bmiss_count will
 142                  * be reset.  Some cards mistakenly report beacon miss
 143                  * so this avoids the expensive scan if the ap is
 144                  * still there.
 145                  */
 146                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 147                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 148                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 149                 return;
 150         }
 151
 152         callout_stop(&vap->iv_swbmiss);
 153         vap->iv_bmiss_count = 0;
 154         vap->iv_stats.is_beacon_miss++;
 155         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 156 #ifdef IEEE80211_SUPPORT_SUPERG
 157
 158                 /*
 159                  * If we receive a beacon miss interrupt when using
 160                  * dynamic turbo, attempt to switch modes before
 161                  * reassociating.
 162                  */
 163                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 164                         ieee80211_dturbo_switch(vap,
 165                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 166 #endif
 167                 /*
 168                  * Try to reassociate before scanning for a new ap.
 169                  */
 170                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 171         } else {
 172                 /*
 173                  * Somebody else is controlling state changes (e.g.
 174                  * a user-mode app) don't do anything that would
 175                  * confuse them; just drop into scan mode so they'll
 176                  * notified of the state change and given control.
 177                  */
 178                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 179         }
 180 }
 181
 182 /*
 183  * Handle deauth with reason.  We retry only for
 184  * the cases where we might succeed.  Otherwise
 185  * we downgrade the ap and scan.
 186  */
 187 static void
 188 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 189 {
 190         switch (reason) {
 191         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 192         case IEEE80211_STATUS_TIMEOUT:
 193         case IEEE80211_REASON_ASSOC_EXPIRE:
 194         case IEEE80211_REASON_NOT_AUTHED:
 195         case IEEE80211_REASON_NOT_ASSOCED:
 196         case IEEE80211_REASON_ASSOC_LEAVE:
 197         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 198                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 199                 break;
 200         default:
 201                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 202                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 203                         ieee80211_check_scan_current(vap);
 204                 break;
 205         }
 206 }
 207
 208 static void
 209 sta_swbmiss_start(struct ieee80211vap *vap)
 210 {
 211
 212         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
 213                 /*
 214                  * Start s/w beacon miss timer for devices w/o
 215                  * hardware support.  We fudge a bit here since
 216                  * we're doing this in software.
 217                  */
 218                 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 219                     2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
 220                 vap->iv_swbmiss_count = 0;
 221                 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 222                     ieee80211_swbmiss, vap);
 223         }
 224 }
 225
 226 /*
 227  * IEEE80211_M_STA vap state machine handler.
 228  * This routine handles the main states in the 802.11 protocol.
 229  */
 230 static int
 231 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 232 {
 233         struct ieee80211com *ic = vap->iv_ic;
 234         struct ieee80211_node *ni;
 235         enum ieee80211_state ostate;
 236
 237         IEEE80211_LOCK_ASSERT(ic);
 238
 239         ostate = vap->iv_state;
 240         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 241             __func__, ieee80211_state_name[ostate],
 242             ieee80211_state_name[nstate], arg);
 243         vap->iv_state = nstate;                 /* state transition */
 244         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 245         if (ostate != IEEE80211_S_SCAN)
 246                 ieee80211_cancel_scan(vap);     /* background scan */
 247         ni = vap->iv_bss;                       /* NB: no reference held */
 248         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 249                 callout_stop(&vap->iv_swbmiss);
 250         switch (nstate) {
 251         case IEEE80211_S_INIT:
 252                 switch (ostate) {
 253                 case IEEE80211_S_SLEEP:
 254                         /* XXX wakeup */
 255                         /* XXX driver hook to wakeup the hardware? */
 256                 case IEEE80211_S_RUN:
 257                         IEEE80211_SEND_MGMT(ni,
 258                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 259                             IEEE80211_REASON_ASSOC_LEAVE);
 260                         ieee80211_sta_leave(ni);
 261                         break;
 262                 case IEEE80211_S_ASSOC:
 263                         IEEE80211_SEND_MGMT(ni,
 264                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 265                             IEEE80211_REASON_AUTH_LEAVE);
 266                         break;
 267                 case IEEE80211_S_SCAN:
 268                         ieee80211_cancel_scan(vap);
 269                         break;
 270                 default:
 271                         break;
 272                 }
 273                 if (ostate != IEEE80211_S_INIT) {
 274                         /* NB: optimize INIT -> INIT case */
 275                         ieee80211_reset_bss(vap);
 276                 }
 277                 if (vap->iv_auth->ia_detach != NULL)
 278                         vap->iv_auth->ia_detach(vap);
 279                 break;
 280         case IEEE80211_S_SCAN:
 281                 switch (ostate) {
 282                 case IEEE80211_S_INIT:
 283                         /*
 284                          * Initiate a scan.  We can come here as a result
 285                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 286                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 287                          * and the scan request parameters will be present
 288                          * in iv_scanreq.  Otherwise we do the default.
 289                          */
 290                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 291                                 ieee80211_check_scan(vap,
 292                                     vap->iv_scanreq_flags,
 293                                     vap->iv_scanreq_duration,
 294                                     vap->iv_scanreq_mindwell,
 295                                     vap->iv_scanreq_maxdwell,
 296                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 297                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 298                         } else
 299                                 ieee80211_check_scan_current(vap);
 300                         break;
 301                 case IEEE80211_S_SCAN:
 302                 case IEEE80211_S_AUTH:
 303                 case IEEE80211_S_ASSOC:
 304                         /*
 305                          * These can happen either because of a timeout
 306                          * on an assoc/auth response or because of a
 307                          * change in state that requires a reset.  For
 308                          * the former we're called with a non-zero arg
 309                          * that is the cause for the failure; pass this
 310                          * to the scan code so it can update state.
 311                          * Otherwise trigger a new scan unless we're in
 312                          * manual roaming mode in which case an application
 313                          * must issue an explicit scan request.
 314                          */
 315                         if (arg != 0)
 316                                 ieee80211_scan_assoc_fail(vap,
 317                                         vap->iv_bss->ni_macaddr, arg);
 318                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 319                                 ieee80211_check_scan_current(vap);
 320                         break;
 321                 case IEEE80211_S_SLEEP:         /* beacon miss */
 322                         /*
 323                          * XXX if in sleep we need to wakeup the hardware.
 324                          */
 325                         /* FALLTHROUGH */
 326                 case IEEE80211_S_RUN:           /* beacon miss */
 327                         /*
 328                          * Beacon miss.  Notify user space and if not
 329                          * under control of a user application (roaming
 330                          * manual) kick off a scan to re-connect.
 331                          */
 332
 333                         ieee80211_sta_leave(ni);
 334                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 335                                 ieee80211_check_scan_current(vap);
 336                         break;
 337                 default:
 338                         goto invalid;
 339                 }
 340                 break;
 341         case IEEE80211_S_AUTH:
 342                 switch (ostate) {
 343                 case IEEE80211_S_INIT:
 344                 case IEEE80211_S_SCAN:
 345                         IEEE80211_SEND_MGMT(ni,
 346                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 347                         break;
 348                 case IEEE80211_S_AUTH:
 349                 case IEEE80211_S_ASSOC:
 350                         switch (arg & 0xff) {
 351                         case IEEE80211_FC0_SUBTYPE_AUTH:
 352                                 /* ??? */
 353                                 IEEE80211_SEND_MGMT(ni,
 354                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 355                                 break;
 356                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 357                                 sta_authretry(vap, ni, arg>>8);
 358                                 break;
 359                         }
 360                         break;
 361                 case IEEE80211_S_SLEEP:
 362                 case IEEE80211_S_RUN:
 363                         switch (arg & 0xff) {
 364                         case IEEE80211_FC0_SUBTYPE_AUTH:
 365                                 IEEE80211_SEND_MGMT(ni,
 366                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 367                                 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
 368                                 break;
 369                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 370                                 ieee80211_sta_leave(ni);
 371                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 372                                         /* try to reauth */
 373                                         IEEE80211_SEND_MGMT(ni,
 374                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 375                                 }
 376                                 break;
 377                         }
 378                         break;
 379                 default:
 380                         goto invalid;
 381                 }
 382                 break;
 383         case IEEE80211_S_ASSOC:
 384                 switch (ostate) {
 385                 case IEEE80211_S_AUTH:
 386                 case IEEE80211_S_ASSOC:
 387                         IEEE80211_SEND_MGMT(ni,
 388                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 389                         break;
 390                 case IEEE80211_S_SLEEP:         /* cannot happen */
 391                 case IEEE80211_S_RUN:
 392                         ieee80211_sta_leave(ni);
 393                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 394                                 IEEE80211_SEND_MGMT(ni, arg ?
 395                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 396                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 397                         }
 398                         break;
 399                 default:
 400                         goto invalid;
 401                 }
 402                 break;
 403         case IEEE80211_S_RUN:
 404                 if (vap->iv_flags & IEEE80211_F_WPA) {
 405                         /* XXX validate prerequisites */
 406                 }
 407                 switch (ostate) {
 408                 case IEEE80211_S_RUN:
 409                 case IEEE80211_S_CSA:
 410                         break;
 411                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 412                 case IEEE80211_S_ASSOC:
 413 #ifdef IEEE80211_DEBUG
 414                         if (ieee80211_msg_debug(vap)) {
 415                                 ieee80211_note(vap, "%s with %s ssid ",
 416                                     (vap->iv_opmode == IEEE80211_M_STA ?
 417                                     "associated" : "synchronized"),
 418                                     ether_sprintf(ni->ni_bssid));
 419                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 420                                     ni->ni_esslen);
 421                                 /* XXX MCS/HT */
 422                                 printf(" channel %d start %uMb\n",
 423                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 424                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 425                         }
 426 #endif
 427                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 428                         ieee80211_notify_node_join(ni,
 429                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 430                         break;
 431                 case IEEE80211_S_SLEEP:
 432                         /* Wake up from sleep */
 433                         vap->iv_sta_ps(vap, 0);
 434                         break;
 435                 default:
 436                         goto invalid;
 437                 }
 438                 ieee80211_sync_curchan(ic);
 439                 if (ostate != IEEE80211_S_RUN)
 440                         sta_swbmiss_start(vap);
 441                 /*
 442                  * When 802.1x is not in use mark the port authorized
 443                  * at this point so traffic can flow.
 444                  */
 445                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 446                         ieee80211_node_authorize(ni);
 447                 /*
 448                  * Fake association when joining an existing bss.
 449                  *
 450                  * Don't do this if we're doing SLEEP->RUN.
 451                  */
 452                 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
 453                         ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
 454                 break;
 455         case IEEE80211_S_CSA:
 456                 if (ostate != IEEE80211_S_RUN)
 457                         goto invalid;
 458                 break;
 459         case IEEE80211_S_SLEEP:
 460                 sta_swbmiss_start(vap);
 461                 vap->iv_sta_ps(vap, 1);
 462                 break;
 463         default:
 464         invalid:
 465                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 466                     "%s: unexpected state transition %s -> %s\n", __func__,
 467                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 468                 break;
 469         }
 470         return 0;
 471 }
 472
 473 /*
 474  * Return non-zero if the frame is an echo of a multicast
 475  * frame sent by ourself.  The dir is known to be DSTODS.
 476  */
 477 static __inline int
 478 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 479 {
 480 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 481 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 482         const uint8_t *sa;
 483
 484         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 485
 486         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 487                 return 0;
 488         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 489         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 490 #undef WH4
 491 #undef QWH4
 492 }
 493
 494 /*
 495  * Return non-zero if the frame is an echo of a multicast
 496  * frame sent by ourself.  The dir is known to be FROMDS.
 497  */
 498 static __inline int
 499 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 500 {
 501         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 502
 503         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 504                 return 0;
 505         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 506 }
 507
 508 /*
 509  * Decide if a received management frame should be
 510  * printed when debugging is enabled.  This filters some
 511  * of the less interesting frames that come frequently
 512  * (e.g. beacons).
 513  */
 514 static __inline int
 515 doprint(struct ieee80211vap *vap, int subtype)
 516 {
 517         switch (subtype) {
 518         case IEEE80211_FC0_SUBTYPE_BEACON:
 519                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 520         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 521                 return 0;
 522         }
 523         return 1;
 524 }
 525
 526 /*
 527  * Process a received frame.  The node associated with the sender
 528  * should be supplied.  If nothing was found in the node table then
 529  * the caller is assumed to supply a reference to iv_bss instead.
 530  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 531  * during AP scanning to select a AP to associate with; it can have
 532  * any units so long as values have consistent units and higher values
 533  * mean ``better signal''.  The receive timestamp is currently not used
 534  * by the 802.11 layer.
 535  */
 536 static int
 537 sta_input(struct ieee80211_node *ni, struct mbuf *m,
 538     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 539 {
 540         struct ieee80211vap *vap = ni->ni_vap;
 541         struct ieee80211com *ic = ni->ni_ic;
 542         struct ifnet *ifp = vap->iv_ifp;
 543         struct ieee80211_frame *wh;
 544         struct ieee80211_key *key;
 545         struct ether_header *eh;
 546         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 547         uint8_t dir, type, subtype, qos;
 548         uint8_t *bssid;
 549
 550         if (m->m_flags & M_AMPDU_MPDU) {
 551                 /*
 552                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 553                  * w/ M_AMPDU_MPDU marked have already passed through
 554                  * here but were received out of order and been held on
 555                  * the reorder queue.  When resubmitted they are marked
 556                  * with the M_AMPDU_MPDU flag and we can bypass most of
 557                  * the normal processing.
 558                  */
 559                 wh = mtod(m, struct ieee80211_frame *);
 560                 type = IEEE80211_FC0_TYPE_DATA;
 561                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 562                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 563                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 564                 goto resubmit_ampdu;
 565         }
 566
 567         KASSERT(ni != NULL, ("null node"));
 568         ni->ni_inact = ni->ni_inact_reload;
 569
 570         type = -1;                      /* undefined */
 571
 572         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 573                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 574                     ni->ni_macaddr, NULL,
 575                     "too short (1): len %u", m->m_pkthdr.len);
 576                 vap->iv_stats.is_rx_tooshort++;
 577                 goto out;
 578         }
 579         /*
 580          * Bit of a cheat here, we use a pointer for a 3-address
 581          * frame format but don't reference fields past outside
 582          * ieee80211_frame_min w/o first validating the data is
 583          * present.
 584          */
 585         wh = mtod(m, struct ieee80211_frame *);
 586
 587         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 588             IEEE80211_FC0_VERSION_0) {
 589                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 590                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 591                     wh->i_fc[0], wh->i_fc[1]);
 592                 vap->iv_stats.is_rx_badversion++;
 593                 goto err;
 594         }
 595
 596         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 597         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 598         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 599         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 600                 bssid = wh->i_addr2;
 601                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 602                         /* not interested in */
 603                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 604                             bssid, NULL, "%s", "not to bss");
 605                         vap->iv_stats.is_rx_wrongbss++;
 606                         goto out;
 607                 }
 608
 609                 /*
 610                  * Some devices may be in a promiscuous mode
 611                  * where they receive frames for multiple station
 612                  * addresses.
 613                  *
 614                  * If we receive a data frame that isn't
 615                  * destined to our VAP MAC, drop it.
 616                  *
 617                  * XXX TODO: This is only enforced when not scanning;
 618                  * XXX it assumes a software-driven scan will put the NIC
 619                  * XXX into a "no data frames" mode before setting this
 620                  * XXX flag. Otherwise it may be possible that we'll still
 621                  * XXX process data frames whilst scanning.
 622                  */
 623                 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
 624                     && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
 625                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 626                             bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
 627                             IF_LLADDR(ifp), ":", wh->i_addr1, ":");
 628                         vap->iv_stats.is_rx_wrongbss++;
 629                         goto out;
 630                 }
 631
 632                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 633                 ni->ni_noise = nf;
 634                 if ( IEEE80211_HAS_SEQ(type, subtype) &&
 635                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 636                         uint8_t tid = ieee80211_gettid(wh);
 637                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 638                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 639                                 ic->ic_wme.wme_hipri_traffic++;
 640                         if (! ieee80211_check_rxseq(ni, wh, bssid))
 641                                 goto out;
 642                 }
 643         }
 644
 645         switch (type) {
 646         case IEEE80211_FC0_TYPE_DATA:
 647                 hdrspace = ieee80211_hdrspace(ic, wh);
 648                 if (m->m_len < hdrspace &&
 649                     (m = m_pullup(m, hdrspace)) == NULL) {
 650                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 651                             ni->ni_macaddr, NULL,
 652                             "data too short: expecting %u", hdrspace);
 653                         vap->iv_stats.is_rx_tooshort++;
 654                         goto out;               /* XXX */
 655                 }
 656                 /*
 657                  * Handle A-MPDU re-ordering.  If the frame is to be
 658                  * processed directly then ieee80211_ampdu_reorder
 659                  * will return 0; otherwise it has consumed the mbuf
 660                  * and we should do nothing more with it.
 661                  */
 662                 if ((m->m_flags & M_AMPDU) &&
 663                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 664                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 665                     ieee80211_ampdu_reorder(ni, m) != 0) {
 666                         m = NULL;
 667                         goto out;
 668                 }
 669         resubmit_ampdu:
 670                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 671                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 672                             isfromds_mcastecho(vap, wh)) {
 673                                 /*
 674                                  * In IEEE802.11 network, multicast
 675                                  * packets sent from "me" are broadcast
 676                                  * from the AP; silently discard for
 677                                  * SIMPLEX interface.
 678                                  */
 679                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 680                                     wh, "data", "%s", "multicast echo");
 681                                 vap->iv_stats.is_rx_mcastecho++;
 682                                 goto out;
 683                         }
 684                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 685                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 686                                 /*
 687                                  * DWDS sta's must drop 3-address mcast frames
 688                                  * as they will be sent separately as a 4-addr
 689                                  * frame.  Accepting the 3-addr frame will
 690                                  * confuse the bridge into thinking the sending
 691                                  * sta is located at the end of WDS link.
 692                                  */
 693                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 694                                     "3-address data", "%s", "DWDS enabled");
 695                                 vap->iv_stats.is_rx_mcastecho++;
 696                                 goto out;
 697                         }
 698                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 699                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 700                                 IEEE80211_DISCARD(vap,
 701                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 702                                     "%s", "DWDS not enabled");
 703                                 vap->iv_stats.is_rx_wrongdir++;
 704                                 goto out;
 705                         }
 706                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 707                             isdstods_mcastecho(vap, wh)) {
 708                                 /*
 709                                  * In IEEE802.11 network, multicast
 710                                  * packets sent from "me" are broadcast
 711                                  * from the AP; silently discard for
 712                                  * SIMPLEX interface.
 713                                  */
 714                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 715                                     "4-address data", "%s", "multicast echo");
 716                                 vap->iv_stats.is_rx_mcastecho++;
 717                                 goto out;
 718                         }
 719                 } else {
 720                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 721                             "data", "incorrect dir 0x%x", dir);
 722                         vap->iv_stats.is_rx_wrongdir++;
 723                         goto out;
 724                 }
 725
 726                 /*
 727                  * Handle privacy requirements.  Note that we
 728                  * must not be preempted from here until after
 729                  * we (potentially) call ieee80211_crypto_demic;
 730                  * otherwise we may violate assumptions in the
 731                  * crypto cipher modules used to do delayed update
 732                  * of replay sequence numbers.
 733                  */
 734                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 735                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 736                                 /*
 737                                  * Discard encrypted frames when privacy is off.
 738                                  */
 739                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 740                                     wh, "WEP", "%s", "PRIVACY off");
 741                                 vap->iv_stats.is_rx_noprivacy++;
 742                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 743                                 goto out;
 744                         }
 745                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 746                         if (key == NULL) {
 747                                 /* NB: stats+msgs handled in crypto_decap */
 748                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 749                                 goto out;
 750                         }
 751                         wh = mtod(m, struct ieee80211_frame *);
 752                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 753                 } else {
 754                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 755                         key = NULL;
 756                 }
 757
 758                 /*
 759                  * Save QoS bits for use below--before we strip the header.
 760                  */
 761                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS)
 762                         qos = ieee80211_getqos(wh)[0];
 763                 else
 764                         qos = 0;
 765
 766                 /*
 767                  * Next up, any fragmentation.
 768                  */
 769                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 770                         m = ieee80211_defrag(ni, m, hdrspace);
 771                         if (m == NULL) {
 772                                 /* Fragment dropped or frame not complete yet */
 773                                 goto out;
 774                         }
 775                 }
 776                 wh = NULL;              /* no longer valid, catch any uses */
 777
 778                 /*
 779                  * Next strip any MSDU crypto bits.
 780                  */
 781                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 782                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 783                             ni->ni_macaddr, "data", "%s", "demic error");
 784                         vap->iv_stats.is_rx_demicfail++;
 785                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 786                         goto out;
 787                 }
 788
 789                 /* copy to listener after decrypt */
 790                 if (ieee80211_radiotap_active_vap(vap))
 791                         ieee80211_radiotap_rx(vap, m);
 792                 need_tap = 0;
 793
 794                 /*
 795                  * Finally, strip the 802.11 header.
 796                  */
 797                 m = ieee80211_decap(vap, m, hdrspace);
 798                 if (m == NULL) {
 799                         /* XXX mask bit to check for both */
 800                         /* don't count Null data frames as errors */
 801                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 802                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 803                                 goto out;
 804                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 805                             ni->ni_macaddr, "data", "%s", "decap error");
 806                         vap->iv_stats.is_rx_decap++;
 807                         IEEE80211_NODE_STAT(ni, rx_decap);
 808                         goto err;
 809                 }
 810                 eh = mtod(m, struct ether_header *);
 811                 if (!ieee80211_node_is_authorized(ni)) {
 812                         /*
 813                          * Deny any non-PAE frames received prior to
 814                          * authorization.  For open/shared-key
 815                          * authentication the port is mark authorized
 816                          * after authentication completes.  For 802.1x
 817                          * the port is not marked authorized by the
 818                          * authenticator until the handshake has completed.
 819                          */
 820                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 821                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 822                                     eh->ether_shost, "data",
 823                                     "unauthorized port: ether type 0x%x len %u",
 824                                     eh->ether_type, m->m_pkthdr.len);
 825                                 vap->iv_stats.is_rx_unauth++;
 826                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 827                                 goto err;
 828                         }
 829                 } else {
 830                         /*
 831                          * When denying unencrypted frames, discard
 832                          * any non-PAE frames received without encryption.
 833                          */
 834                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 835                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 836                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 837                                 /*
 838                                  * Drop unencrypted frames.
 839                                  */
 840                                 vap->iv_stats.is_rx_unencrypted++;
 841                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 842                                 goto out;
 843                         }
 844                 }
 845                 /* XXX require HT? */
 846                 if (qos & IEEE80211_QOS_AMSDU) {
 847                         m = ieee80211_decap_amsdu(ni, m);
 848                         if (m == NULL)
 849                                 return IEEE80211_FC0_TYPE_DATA;
 850                 } else {
 851 #ifdef IEEE80211_SUPPORT_SUPERG
 852                         m = ieee80211_decap_fastframe(vap, ni, m);
 853                         if (m == NULL)
 854                                 return IEEE80211_FC0_TYPE_DATA;
 855 #endif
 856                 }
 857                 ieee80211_deliver_data(vap, ni, m);
 858                 return IEEE80211_FC0_TYPE_DATA;
 859
 860         case IEEE80211_FC0_TYPE_MGT:
 861                 vap->iv_stats.is_rx_mgmt++;
 862                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 863                 if (dir != IEEE80211_FC1_DIR_NODS) {
 864                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 865                             wh, "data", "incorrect dir 0x%x", dir);
 866                         vap->iv_stats.is_rx_wrongdir++;
 867                         goto err;
 868                 }
 869                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 870                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 871                             ni->ni_macaddr, "mgt", "too short: len %u",
 872                             m->m_pkthdr.len);
 873                         vap->iv_stats.is_rx_tooshort++;
 874                         goto out;
 875                 }
 876 #ifdef IEEE80211_DEBUG
 877                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 878                     ieee80211_msg_dumppkts(vap)) {
 879                         if_printf(ifp, "received %s from %s rssi %d\n",
 880                             ieee80211_mgt_subtype_name(subtype),
 881                             ether_sprintf(wh->i_addr2), rssi);
 882                 }
 883 #endif
 884                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 885                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 886                                 /*
 887                                  * Only shared key auth frames with a challenge
 888                                  * should be encrypted, discard all others.
 889                                  */
 890                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 891                                     wh, ieee80211_mgt_subtype_name(subtype),
 892                                     "%s", "WEP set but not permitted");
 893                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 894                                 goto out;
 895                         }
 896                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 897                                 /*
 898                                  * Discard encrypted frames when privacy is off.
 899                                  */
 900                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 901                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 902                                 vap->iv_stats.is_rx_noprivacy++;
 903                                 goto out;
 904                         }
 905                         hdrspace = ieee80211_hdrspace(ic, wh);
 906                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 907                         if (key == NULL) {
 908                                 /* NB: stats+msgs handled in crypto_decap */
 909                                 goto out;
 910                         }
 911                         wh = mtod(m, struct ieee80211_frame *);
 912                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 913                 }
 914                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 915                 goto out;
 916
 917         case IEEE80211_FC0_TYPE_CTL:
 918                 vap->iv_stats.is_rx_ctl++;
 919                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 920                 vap->iv_recv_ctl(ni, m, subtype);
 921                 goto out;
 922
 923         default:
 924                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 925                     wh, NULL, "bad frame type 0x%x", type);
 926                 /* should not come here */
 927                 break;
 928         }
 929 err:
 930         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 931 out:
 932         if (m != NULL) {
 933                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 934                         ieee80211_radiotap_rx(vap, m);
 935                 m_freem(m);
 936         }
 937         return type;
 938 }
 939
 940 static void
 941 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 942     int rssi, int nf, uint16_t seq, uint16_t status)
 943 {
 944         struct ieee80211vap *vap = ni->ni_vap;
 945
 946         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 947                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 948                     ni->ni_macaddr, "open auth",
 949                     "bad sta auth mode %u", ni->ni_authmode);
 950                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 951                 return;
 952         }
 953         if (vap->iv_state != IEEE80211_S_AUTH ||
 954             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
 955                 vap->iv_stats.is_rx_bad_auth++;
 956                 return;
 957         }
 958         if (status != 0) {
 959                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 960                     ni, "open auth failed (reason %d)", status);
 961                 vap->iv_stats.is_rx_auth_fail++;
 962                 vap->iv_stats.is_rx_authfail_code = status;
 963                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 964                     IEEE80211_SCAN_FAIL_STATUS);
 965         } else
 966                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 967 }
 968
 969 static void
 970 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 971     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 972     uint16_t seq, uint16_t status)
 973 {
 974         struct ieee80211vap *vap = ni->ni_vap;
 975         uint8_t *challenge;
 976
 977         /*
 978          * NB: this can happen as we allow pre-shared key
 979          * authentication to be enabled w/o wep being turned
 980          * on so that configuration of these can be done
 981          * in any order.  It may be better to enforce the
 982          * ordering in which case this check would just be
 983          * for sanity/consistency.
 984          */
 985         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 986                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 987                     ni->ni_macaddr, "shared key auth",
 988                     "%s", " PRIVACY is disabled");
 989                 goto bad;
 990         }
 991         /*
 992          * Pre-shared key authentication is evil; accept
 993          * it only if explicitly configured (it is supported
 994          * mainly for compatibility with clients like OS X).
 995          */
 996         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
 997             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
 998                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 999                     ni->ni_macaddr, "shared key auth",
1000                     "bad sta auth mode %u", ni->ni_authmode);
1001                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1002                 goto bad;
1003         }
1004
1005         challenge = NULL;
1006         if (frm + 1 < efrm) {
1007                 if ((frm[1] + 2) > (efrm - frm)) {
1008                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1009                             ni->ni_macaddr, "shared key auth",
1010                             "ie %d/%d too long",
1011                             frm[0], (frm[1] + 2) - (efrm - frm));
1012                         vap->iv_stats.is_rx_bad_auth++;
1013                         goto bad;
1014                 }
1015                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1016                         challenge = frm;
1017                 frm += frm[1] + 2;
1018         }
1019         switch (seq) {
1020         case IEEE80211_AUTH_SHARED_CHALLENGE:
1021         case IEEE80211_AUTH_SHARED_RESPONSE:
1022                 if (challenge == NULL) {
1023                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1024                             ni->ni_macaddr, "shared key auth",
1025                             "%s", "no challenge");
1026                         vap->iv_stats.is_rx_bad_auth++;
1027                         goto bad;
1028                 }
1029                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1030                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1031                             ni->ni_macaddr, "shared key auth",
1032                             "bad challenge len %d", challenge[1]);
1033                         vap->iv_stats.is_rx_bad_auth++;
1034                         goto bad;
1035                 }
1036         default:
1037                 break;
1038         }
1039         if (vap->iv_state != IEEE80211_S_AUTH)
1040                 return;
1041         switch (seq) {
1042         case IEEE80211_AUTH_SHARED_PASS:
1043                 if (ni->ni_challenge != NULL) {
1044                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1045                         ni->ni_challenge = NULL;
1046                 }
1047                 if (status != 0) {
1048                         IEEE80211_NOTE_FRAME(vap,
1049                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1050                             "shared key auth failed (reason %d)", status);
1051                         vap->iv_stats.is_rx_auth_fail++;
1052                         vap->iv_stats.is_rx_authfail_code = status;
1053                         return;
1054                 }
1055                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1056                 break;
1057         case IEEE80211_AUTH_SHARED_CHALLENGE:
1058                 if (!ieee80211_alloc_challenge(ni))
1059                         return;
1060                 /* XXX could optimize by passing recvd challenge */
1061                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1062                 IEEE80211_SEND_MGMT(ni,
1063                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1064                 break;
1065         default:
1066                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1067                     wh, "shared key auth", "bad seq %d", seq);
1068                 vap->iv_stats.is_rx_bad_auth++;
1069                 return;
1070         }
1071         return;
1072 bad:
1073         /*
1074          * Kick the state machine.  This short-circuits
1075          * using the mgt frame timeout to trigger the
1076          * state transition.
1077          */
1078         if (vap->iv_state == IEEE80211_S_AUTH)
1079                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1080                     IEEE80211_SCAN_FAIL_STATUS);
1081 }
1082
1083 int
1084 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1085         const struct ieee80211_frame *wh)
1086 {
1087 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1088         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1089         u_int len = frm[1], qosinfo;
1090         int i;
1091
1092         if (len < sizeof(struct ieee80211_wme_param)-2) {
1093                 IEEE80211_DISCARD_IE(vap,
1094                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1095                     wh, "WME", "too short, len %u", len);
1096                 return -1;
1097         }
1098         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1099         qosinfo &= WME_QOSINFO_COUNT;
1100         /* XXX do proper check for wraparound */
1101         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1102                 return 0;
1103         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1104         for (i = 0; i < WME_NUM_AC; i++) {
1105                 struct wmeParams *wmep =
1106                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1107                 /* NB: ACI not used */
1108                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1109                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1110                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1111                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1112                 wmep->wmep_txopLimit = le16dec(frm+2);
1113                 frm += 4;
1114         }
1115         wme->wme_wmeChanParams.cap_info = qosinfo;
1116         return 1;
1117 #undef MS
1118 }
1119
1120 /*
1121  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1122  * is the first CSA then initiate the switch.  Otherwise we
1123  * track state and trigger completion and/or cancel of the switch.
1124  * XXX should be public for IBSS use
1125  */
1126 static void
1127 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1128         const struct ieee80211_frame *wh)
1129 {
1130         struct ieee80211com *ic = vap->iv_ic;
1131         const struct ieee80211_csa_ie *csa =
1132             (const struct ieee80211_csa_ie *) frm;
1133
1134         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1135             ("state %s", ieee80211_state_name[vap->iv_state]));
1136
1137         if (csa->csa_mode > 1) {
1138                 IEEE80211_DISCARD_IE(vap,
1139                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1140                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1141                 return;
1142         }
1143         IEEE80211_LOCK(ic);
1144         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1145                 /*
1146                  * Convert the channel number to a channel reference.  We
1147                  * try first to preserve turbo attribute of the current
1148                  * channel then fallback.  Note this will not work if the
1149                  * CSA specifies a channel that requires a band switch (e.g.
1150                  * 11a => 11g).  This is intentional as 11h is defined only
1151                  * for 5GHz/11a and because the switch does not involve a
1152                  * reassociation, protocol state (capabilities, negotated
1153                  * rates, etc) may/will be wrong.
1154                  */
1155                 struct ieee80211_channel *c =
1156                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1157                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1158                 if (c == NULL) {
1159                         c = ieee80211_find_channel_byieee(ic,
1160                             csa->csa_newchan,
1161                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1162                         if (c == NULL) {
1163                                 IEEE80211_DISCARD_IE(vap,
1164                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1165                                     wh, "CSA", "invalid channel %u",
1166                                     csa->csa_newchan);
1167                                 goto done;
1168                         }
1169                 }
1170 #if IEEE80211_CSA_COUNT_MIN > 0
1171                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1172                         /*
1173                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1174                          * reduce the risk of being redirected by a fabricated
1175                          * CSA.  If a valid CSA is dropped we'll still get a
1176                          * beacon miss when the AP leaves the channel so we'll
1177                          * eventually follow to the new channel.
1178                          *
1179                          * NOTE: this violates the 11h spec that states that
1180                          * count may be any value and if 0 then a switch
1181                          * should happen asap.
1182                          */
1183                         IEEE80211_DISCARD_IE(vap,
1184                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1185                             wh, "CSA", "count %u too small, must be >= %u",
1186                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1187                         goto done;
1188                 }
1189 #endif
1190                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1191         } else {
1192                 /*
1193                  * Validate this ie against the initial CSA.  We require
1194                  * mode and channel not change and the count must be
1195                  * monotonically decreasing.  This may be pointless and
1196                  * canceling the switch as a result may be too paranoid but
1197                  * in the worst case if we drop out of CSA because of this
1198                  * and the AP does move then we'll just end up taking a
1199                  * beacon miss and scan to find the AP.
1200                  *
1201                  * XXX may want <= on count as we also process ProbeResp
1202                  * frames and those may come in w/ the same count as the
1203                  * previous beacon; but doing so leaves us open to a stuck
1204                  * count until we add a dead-man timer
1205                  */
1206                 if (!(csa->csa_count < ic->ic_csa_count &&
1207                       csa->csa_mode == ic->ic_csa_mode &&
1208                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1209                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1210                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1211                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1212                             ic->ic_csa_newchan, ic->ic_csa_count,
1213                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1214                         ieee80211_csa_cancelswitch(ic);
1215                 } else {
1216                         if (csa->csa_count <= 1)
1217                                 ieee80211_csa_completeswitch(ic);
1218                         else
1219                                 ic->ic_csa_count = csa->csa_count;
1220                 }
1221         }
1222 done:
1223         IEEE80211_UNLOCK(ic);
1224 }
1225
1226 /*
1227  * Return non-zero if a background scan may be continued:
1228  * o bg scan is active
1229  * o no channel switch is pending
1230  * o there has not been any traffic recently
1231  *
1232  * Note we do not check if there is an administrative enable;
1233  * this is only done to start the scan.  We assume that any
1234  * change in state will be accompanied by a request to cancel
1235  * active scans which will otherwise cause this test to fail.
1236  */
1237 static __inline int
1238 contbgscan(struct ieee80211vap *vap)
1239 {
1240         struct ieee80211com *ic = vap->iv_ic;
1241
1242         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1243             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1244             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1245             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1246 }
1247
1248 /*
1249  * Return non-zero if a backgrond scan may be started:
1250  * o bg scanning is administratively enabled
1251  * o no channel switch is pending
1252  * o we are not boosted on a dynamic turbo channel
1253  * o there has not been a scan recently
1254  * o there has not been any traffic recently
1255  */
1256 static __inline int
1257 startbgscan(struct ieee80211vap *vap)
1258 {
1259         struct ieee80211com *ic = vap->iv_ic;
1260
1261         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1262             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1263 #ifdef IEEE80211_SUPPORT_SUPERG
1264             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1265 #endif
1266             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1267             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1268 }
1269
1270 static void
1271 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1272     const struct ieee80211_rx_stats *rxs,
1273     int rssi, int nf)
1274 {
1275 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1276         struct ieee80211vap *vap = ni->ni_vap;
1277         struct ieee80211com *ic = ni->ni_ic;
1278         struct ieee80211_channel *rxchan = ic->ic_curchan;
1279         struct ieee80211_frame *wh;
1280         uint8_t *frm, *efrm;
1281         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1282         uint8_t rate;
1283         int ht_state_change = 0;
1284
1285         wh = mtod(m0, struct ieee80211_frame *);
1286         frm = (uint8_t *)&wh[1];
1287         efrm = mtod(m0, uint8_t *) + m0->m_len;
1288         switch (subtype) {
1289         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1290         case IEEE80211_FC0_SUBTYPE_BEACON: {
1291                 struct ieee80211_scanparams scan;
1292                 struct ieee80211_channel *c;
1293                 /*
1294                  * We process beacon/probe response frames:
1295                  *    o when scanning, or
1296                  *    o station mode when associated (to collect state
1297                  *      updates such as 802.11g slot time)
1298                  * Frames otherwise received are discarded.
1299                  */
1300                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1301                         vap->iv_stats.is_rx_mgtdiscard++;
1302                         return;
1303                 }
1304
1305                 /* Override RX channel as appropriate */
1306                 if (rxs != NULL) {
1307                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1308                         if (c != NULL)
1309                                 rxchan = c;
1310                 }
1311
1312                 /* XXX probe response in sta mode when !scanning? */
1313                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1314                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1315                                 vap->iv_stats.is_beacon_bad++;
1316                         return;
1317                 }
1318
1319                 /*
1320                  * Count frame now that we know it's to be processed.
1321                  */
1322                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1323                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1324                         IEEE80211_NODE_STAT(ni, rx_beacons);
1325                 } else
1326                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1327                 /*
1328                  * When operating in station mode, check for state updates.
1329                  * Be careful to ignore beacons received while doing a
1330                  * background scan.  We consider only 11g/WMM stuff right now.
1331                  */
1332                 if (ni->ni_associd != 0 &&
1333                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1334                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1335                         /* record tsf of last beacon */
1336                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1337                                 sizeof(ni->ni_tstamp));
1338                         /* count beacon frame for s/w bmiss handling */
1339                         vap->iv_swbmiss_count++;
1340                         vap->iv_bmiss_count = 0;
1341                         if (ni->ni_erp != scan.erp) {
1342                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1343                                     wh->i_addr2,
1344                                     "erp change: was 0x%x, now 0x%x",
1345                                     ni->ni_erp, scan.erp);
1346                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1347                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1348                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1349                                 else
1350                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1351                                 ni->ni_erp = scan.erp;
1352                                 /* XXX statistic */
1353                                 /* XXX driver notification */
1354                         }
1355                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1356                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1357                                     wh->i_addr2,
1358                                     "capabilities change: was 0x%x, now 0x%x",
1359                                     ni->ni_capinfo, scan.capinfo);
1360                                 /*
1361                                  * NB: we assume short preamble doesn't
1362                                  *     change dynamically
1363                                  */
1364                                 ieee80211_set_shortslottime(ic,
1365                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1366                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1367                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1368                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1369                                 /* XXX statistic */
1370                         }
1371                         if (scan.wme != NULL &&
1372                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1373                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1374                                 ieee80211_wme_updateparams(vap);
1375 #ifdef IEEE80211_SUPPORT_SUPERG
1376                         if (scan.ath != NULL)
1377                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1378 #endif
1379                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1380                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1381                                 /* XXX state changes? */
1382                                 if (ieee80211_ht_updateparams(ni,
1383                                     scan.htcap, scan.htinfo))
1384                                         ht_state_change = 1;
1385                         }
1386                         if (scan.quiet)
1387                                 ic->ic_set_quiet(ni, scan.quiet);
1388
1389                         if (scan.tim != NULL) {
1390                                 struct ieee80211_tim_ie *tim =
1391                                     (struct ieee80211_tim_ie *) scan.tim;
1392                                 /*
1393                                  * XXX Check/debug this code; see if it's about
1394                                  * the right time to force the VAP awake if we
1395                                  * receive a frame destined for us?
1396                                  */
1397                                 int aid = IEEE80211_AID(ni->ni_associd);
1398                                 int ix = aid / NBBY;
1399                                 int min = tim->tim_bitctl &~ 1;
1400                                 int max = tim->tim_len + min - 4;
1401                                 int tim_ucast = 0, tim_mcast = 0;
1402
1403                                 /*
1404                                  * Only do this for unicast traffic in the TIM
1405                                  * The multicast traffic notification for
1406                                  * the scan notification stuff should occur
1407                                  * differently.
1408                                  */
1409                                 if (min <= ix && ix <= max &&
1410                                      isset(tim->tim_bitmap - min, aid)) {
1411                                         tim_ucast = 1;
1412                                 }
1413
1414                                 /*
1415                                  * Do a separate notification
1416                                  * for the multicast bit being set.
1417                                  */
1418                                 if (tim->tim_bitctl & 1) {
1419                                         tim_mcast = 1;
1420                                 }
1421
1422                                 /*
1423                                  * If the TIM indicates there's traffic for
1424                                  * us then get us out of STA mode powersave.
1425                                  */
1426                                 if (tim_ucast == 1) {
1427
1428                                         /*
1429                                          * Wake us out of SLEEP state if we're
1430                                          * in it; and if we're doing bgscan
1431                                          * then wake us out of STA powersave.
1432                                          */
1433                                         ieee80211_sta_tim_notify(vap, 1);
1434
1435                                         /*
1436                                          * This is preventing us from
1437                                          * continuing a bgscan; because it
1438                                          * tricks the contbgscan()
1439                                          * routine to think there's always
1440                                          * traffic for us.
1441                                          *
1442                                          * I think we need both an RX and
1443                                          * TX ic_lastdata field.
1444                                          */
1445                                         ic->ic_lastdata = ticks;
1446                                 }
1447
1448                                 ni->ni_dtim_count = tim->tim_count;
1449                                 ni->ni_dtim_period = tim->tim_period;
1450                         }
1451                         if (scan.csa != NULL &&
1452                             (vap->iv_flags & IEEE80211_F_DOTH))
1453                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1454                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1455                                 /*
1456                                  * No CSA ie or 11h disabled, but a channel
1457                                  * switch is pending; drop out so we aren't
1458                                  * stuck in CSA state.  If the AP really is
1459                                  * moving we'll get a beacon miss and scan.
1460                                  */
1461                                 IEEE80211_LOCK(ic);
1462                                 ieee80211_csa_cancelswitch(ic);
1463                                 IEEE80211_UNLOCK(ic);
1464                         }
1465                         /*
1466                          * If scanning, pass the info to the scan module.
1467                          * Otherwise, check if it's the right time to do
1468                          * a background scan.  Background scanning must
1469                          * be enabled and we must not be operating in the
1470                          * turbo phase of dynamic turbo mode.  Then,
1471                          * it's been a while since the last background
1472                          * scan and if no data frames have come through
1473                          * recently, kick off a scan.  Note that this
1474                          * is the mechanism by which a background scan
1475                          * is started _and_ continued each time we
1476                          * return on-channel to receive a beacon from
1477                          * our ap.
1478                          */
1479                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1480                                 ieee80211_add_scan(vap, rxchan,
1481                                     &scan, wh, subtype, rssi, nf);
1482                         } else if (contbgscan(vap)) {
1483                                 ieee80211_bg_scan(vap, 0);
1484                         } else if (startbgscan(vap)) {
1485                                 vap->iv_stats.is_scan_bg++;
1486 #if 0
1487                                 /* wakeup if we are sleeing */
1488                                 ieee80211_set_pwrsave(vap, 0);
1489 #endif
1490                                 ieee80211_bg_scan(vap, 0);
1491                         }
1492
1493                         /*
1494                          * Put the station to sleep if we haven't seen
1495                          * traffic in a while.
1496                          */
1497                         IEEE80211_LOCK(ic);
1498                         ieee80211_sta_ps_timer_check(vap);
1499                         IEEE80211_UNLOCK(ic);
1500
1501                         /*
1502                          * If we've had a channel width change (eg HT20<->HT40)
1503                          * then schedule a delayed driver notification.
1504                          */
1505                         if (ht_state_change)
1506                                 ieee80211_update_chw(ic);
1507                         return;
1508                 }
1509                 /*
1510                  * If scanning, just pass information to the scan module.
1511                  */
1512                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1513                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1514                                 /*
1515                                  * Actively scanning a channel marked passive;
1516                                  * send a probe request now that we know there
1517                                  * is 802.11 traffic present.
1518                                  *
1519                                  * XXX check if the beacon we recv'd gives
1520                                  * us what we need and suppress the probe req
1521                                  */
1522                                 ieee80211_probe_curchan(vap, 1);
1523                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1524                         }
1525                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1526                             subtype, rssi, nf);
1527                         return;
1528                 }
1529                 break;
1530         }
1531
1532         case IEEE80211_FC0_SUBTYPE_AUTH: {
1533                 uint16_t algo, seq, status;
1534                 /*
1535                  * auth frame format
1536                  *      [2] algorithm
1537                  *      [2] sequence
1538                  *      [2] status
1539                  *      [tlv*] challenge
1540                  */
1541                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1542                 algo   = le16toh(*(uint16_t *)frm);
1543                 seq    = le16toh(*(uint16_t *)(frm + 2));
1544                 status = le16toh(*(uint16_t *)(frm + 4));
1545                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1546                     "recv auth frame with algorithm %d seq %d", algo, seq);
1547
1548                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1549                         IEEE80211_DISCARD(vap,
1550                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1551                             wh, "auth", "%s", "TKIP countermeasures enabled");
1552                         vap->iv_stats.is_rx_auth_countermeasures++;
1553                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1554                                 ieee80211_send_error(ni, wh->i_addr2,
1555                                         IEEE80211_FC0_SUBTYPE_AUTH,
1556                                         IEEE80211_REASON_MIC_FAILURE);
1557                         }
1558                         return;
1559                 }
1560                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1561                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1562                             seq, status);
1563                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1564                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1565                 else {
1566                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1567                             wh, "auth", "unsupported alg %d", algo);
1568                         vap->iv_stats.is_rx_auth_unsupported++;
1569                         return;
1570                 }
1571                 break;
1572         }
1573
1574         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1575         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1576                 uint16_t capinfo, associd;
1577                 uint16_t status;
1578
1579                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1580                         vap->iv_stats.is_rx_mgtdiscard++;
1581                         return;
1582                 }
1583
1584                 /*
1585                  * asresp frame format
1586                  *      [2] capability information
1587                  *      [2] status
1588                  *      [2] association ID
1589                  *      [tlv] supported rates
1590                  *      [tlv] extended supported rates
1591                  *      [tlv] WME
1592                  *      [tlv] HT capabilities
1593                  *      [tlv] HT info
1594                  */
1595                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1596                 ni = vap->iv_bss;
1597                 capinfo = le16toh(*(uint16_t *)frm);
1598                 frm += 2;
1599                 status = le16toh(*(uint16_t *)frm);
1600                 frm += 2;
1601                 if (status != 0) {
1602                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1603                             wh->i_addr2, "%sassoc failed (reason %d)",
1604                             ISREASSOC(subtype) ?  "re" : "", status);
1605                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1606                         return;
1607                 }
1608                 associd = le16toh(*(uint16_t *)frm);
1609                 frm += 2;
1610
1611                 rates = xrates = wme = htcap = htinfo = NULL;
1612                 while (efrm - frm > 1) {
1613                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1614                         switch (*frm) {
1615                         case IEEE80211_ELEMID_RATES:
1616                                 rates = frm;
1617                                 break;
1618                         case IEEE80211_ELEMID_XRATES:
1619                                 xrates = frm;
1620                                 break;
1621                         case IEEE80211_ELEMID_HTCAP:
1622                                 htcap = frm;
1623                                 break;
1624                         case IEEE80211_ELEMID_HTINFO:
1625                                 htinfo = frm;
1626                                 break;
1627                         case IEEE80211_ELEMID_VENDOR:
1628                                 if (iswmeoui(frm))
1629                                         wme = frm;
1630                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1631                                         /*
1632                                          * Accept pre-draft HT ie's if the
1633                                          * standard ones have not been seen.
1634                                          */
1635                                         if (ishtcapoui(frm)) {
1636                                                 if (htcap == NULL)
1637                                                         htcap = frm;
1638                                         } else if (ishtinfooui(frm)) {
1639                                                 if (htinfo == NULL)
1640                                                         htinfo = frm;
1641                                         }
1642                                 }
1643                                 /* XXX Atheros OUI support */
1644                                 break;
1645                         }
1646                         frm += frm[1] + 2;
1647                 }
1648
1649                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1650                 if (xrates != NULL)
1651                         IEEE80211_VERIFY_ELEMENT(xrates,
1652                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1653                 rate = ieee80211_setup_rates(ni, rates, xrates,
1654                                 IEEE80211_F_JOIN |
1655                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1656                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1657                 if (rate & IEEE80211_RATE_BASIC) {
1658                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1659                             wh->i_addr2,
1660                             "%sassoc failed (rate set mismatch)",
1661                             ISREASSOC(subtype) ?  "re" : "");
1662                         vap->iv_stats.is_rx_assoc_norate++;
1663                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1664                             IEEE80211_SCAN_FAIL_STATUS);
1665                         return;
1666                 }
1667
1668                 ni->ni_capinfo = capinfo;
1669                 ni->ni_associd = associd;
1670                 if (ni->ni_jointime == 0)
1671                         ni->ni_jointime = time_uptime;
1672                 if (wme != NULL &&
1673                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1674                         ni->ni_flags |= IEEE80211_NODE_QOS;
1675                         ieee80211_wme_updateparams(vap);
1676                 } else
1677                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1678                 /*
1679                  * Setup HT state according to the negotiation.
1680                  *
1681                  * NB: shouldn't need to check if HT use is enabled but some
1682                  *     ap's send back HT ie's even when we don't indicate we
1683                  *     are HT capable in our AssocReq.
1684                  */
1685                 if (htcap != NULL && htinfo != NULL &&
1686                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1687                         ieee80211_ht_node_init(ni);
1688                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1689                         ieee80211_setup_htrates(ni, htcap,
1690                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1691                         ieee80211_setup_basic_htrates(ni, htinfo);
1692                         ieee80211_node_setuptxparms(ni);
1693                         ieee80211_ratectl_node_init(ni);
1694                 }
1695
1696                 /*
1697                  * Always initialise FF/superg state; we can use this
1698                  * for doing A-MSDU encapsulation as well.
1699                  */
1700 #ifdef  IEEE80211_SUPPORT_SUPERG
1701                 ieee80211_ff_node_init(ni);
1702 #endif
1703
1704                 /*
1705                  * Configure state now that we are associated.
1706                  *
1707                  * XXX may need different/additional driver callbacks?
1708                  */
1709                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1710                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1711                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1712                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1713                 } else {
1714                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1715                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1716                 }
1717                 ieee80211_set_shortslottime(ic,
1718                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1719                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1720                 /*
1721                  * Honor ERP protection.
1722                  *
1723                  * NB: ni_erp should zero for non-11g operation.
1724                  */
1725                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1726                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1727                         ic->ic_flags |= IEEE80211_F_USEPROT;
1728                 else
1729                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1730                 IEEE80211_NOTE_MAC(vap,
1731                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1732                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1733                     ISREASSOC(subtype) ? "re" : "",
1734                     IEEE80211_NODE_AID(ni),
1735                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1736                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1737                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1738                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1739                     ni->ni_flags & IEEE80211_NODE_HT ?
1740                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1741                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1742                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1743                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1744                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1745                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1746                         ", fast-frames" : "",
1747                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1748                         ", turbo" : ""
1749                 );
1750                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1751                 break;
1752         }
1753
1754         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1755                 uint16_t reason;
1756
1757                 if (vap->iv_state == IEEE80211_S_SCAN) {
1758                         vap->iv_stats.is_rx_mgtdiscard++;
1759                         return;
1760                 }
1761                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1762                         /* NB: can happen when in promiscuous mode */
1763                         vap->iv_stats.is_rx_mgtdiscard++;
1764                         break;
1765                 }
1766
1767                 /*
1768                  * deauth frame format
1769                  *      [2] reason
1770                  */
1771                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1772                 reason = le16toh(*(uint16_t *)frm);
1773
1774                 vap->iv_stats.is_rx_deauth++;
1775                 vap->iv_stats.is_rx_deauth_code = reason;
1776                 IEEE80211_NODE_STAT(ni, rx_deauth);
1777
1778                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1779                     "recv deauthenticate (reason: %d (%s))", reason,
1780                     ieee80211_reason_to_string(reason));
1781                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1782                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1783                 break;
1784         }
1785
1786         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1787                 uint16_t reason;
1788
1789                 if (vap->iv_state != IEEE80211_S_RUN &&
1790                     vap->iv_state != IEEE80211_S_ASSOC &&
1791                     vap->iv_state != IEEE80211_S_AUTH) {
1792                         vap->iv_stats.is_rx_mgtdiscard++;
1793                         return;
1794                 }
1795                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1796                         /* NB: can happen when in promiscuous mode */
1797                         vap->iv_stats.is_rx_mgtdiscard++;
1798                         break;
1799                 }
1800
1801                 /*
1802                  * disassoc frame format
1803                  *      [2] reason
1804                  */
1805                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1806                 reason = le16toh(*(uint16_t *)frm);
1807
1808                 vap->iv_stats.is_rx_disassoc++;
1809                 vap->iv_stats.is_rx_disassoc_code = reason;
1810                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1811
1812                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1813                     "recv disassociate (reason: %d (%s))", reason,
1814                     ieee80211_reason_to_string(reason));
1815                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1816                 break;
1817         }
1818
1819         case IEEE80211_FC0_SUBTYPE_ACTION:
1820         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1821                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1822                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1823                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1824                             wh, NULL, "%s", "not for us");
1825                         vap->iv_stats.is_rx_mgtdiscard++;
1826                 } else if (vap->iv_state != IEEE80211_S_RUN) {
1827                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1828                             wh, NULL, "wrong state %s",
1829                             ieee80211_state_name[vap->iv_state]);
1830                         vap->iv_stats.is_rx_mgtdiscard++;
1831                 } else {
1832                         if (ieee80211_parse_action(ni, m0) == 0)
1833                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1834                 }
1835                 break;
1836
1837         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1838         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1839         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1840         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1841         case IEEE80211_FC0_SUBTYPE_ATIM:
1842                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1843                     wh, NULL, "%s", "not handled");
1844                 vap->iv_stats.is_rx_mgtdiscard++;
1845                 break;
1846
1847         default:
1848                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1849                     wh, "mgt", "subtype 0x%x not handled", subtype);
1850                 vap->iv_stats.is_rx_badsubtype++;
1851                 break;
1852         }
1853 #undef ISREASSOC
1854 }
1855
1856 static void
1857 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1858 {
1859         switch (subtype) {
1860         case IEEE80211_FC0_SUBTYPE_BAR:
1861                 ieee80211_recv_bar(ni, m);
1862                 break;
1863         }
1864 }