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 = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 763                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 764                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 765                 } else
 766                         qos = 0;
 767
 768                 /*
 769                  * Next up, any fragmentation.
 770                  */
 771                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 772                         m = ieee80211_defrag(ni, m, hdrspace);
 773                         if (m == NULL) {
 774                                 /* Fragment dropped or frame not complete yet */
 775                                 goto out;
 776                         }
 777                 }
 778                 wh = NULL;              /* no longer valid, catch any uses */
 779
 780                 /*
 781                  * Next strip any MSDU crypto bits.
 782                  */
 783                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 784                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 785                             ni->ni_macaddr, "data", "%s", "demic error");
 786                         vap->iv_stats.is_rx_demicfail++;
 787                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 788                         goto out;
 789                 }
 790
 791                 /* copy to listener after decrypt */
 792                 if (ieee80211_radiotap_active_vap(vap))
 793                         ieee80211_radiotap_rx(vap, m);
 794                 need_tap = 0;
 795
 796                 /*
 797                  * Finally, strip the 802.11 header.
 798                  */
 799                 m = ieee80211_decap(vap, m, hdrspace);
 800                 if (m == NULL) {
 801                         /* XXX mask bit to check for both */
 802                         /* don't count Null data frames as errors */
 803                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 804                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 805                                 goto out;
 806                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 807                             ni->ni_macaddr, "data", "%s", "decap error");
 808                         vap->iv_stats.is_rx_decap++;
 809                         IEEE80211_NODE_STAT(ni, rx_decap);
 810                         goto err;
 811                 }
 812                 eh = mtod(m, struct ether_header *);
 813                 if (!ieee80211_node_is_authorized(ni)) {
 814                         /*
 815                          * Deny any non-PAE frames received prior to
 816                          * authorization.  For open/shared-key
 817                          * authentication the port is mark authorized
 818                          * after authentication completes.  For 802.1x
 819                          * the port is not marked authorized by the
 820                          * authenticator until the handshake has completed.
 821                          */
 822                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 823                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 824                                     eh->ether_shost, "data",
 825                                     "unauthorized port: ether type 0x%x len %u",
 826                                     eh->ether_type, m->m_pkthdr.len);
 827                                 vap->iv_stats.is_rx_unauth++;
 828                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 829                                 goto err;
 830                         }
 831                 } else {
 832                         /*
 833                          * When denying unencrypted frames, discard
 834                          * any non-PAE frames received without encryption.
 835                          */
 836                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 837                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 838                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 839                                 /*
 840                                  * Drop unencrypted frames.
 841                                  */
 842                                 vap->iv_stats.is_rx_unencrypted++;
 843                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 844                                 goto out;
 845                         }
 846                 }
 847                 /* XXX require HT? */
 848                 if (qos & IEEE80211_QOS_AMSDU) {
 849                         m = ieee80211_decap_amsdu(ni, m);
 850                         if (m == NULL)
 851                                 return IEEE80211_FC0_TYPE_DATA;
 852                 } else {
 853 #ifdef IEEE80211_SUPPORT_SUPERG
 854                         m = ieee80211_decap_fastframe(vap, ni, m);
 855                         if (m == NULL)
 856                                 return IEEE80211_FC0_TYPE_DATA;
 857 #endif
 858                 }
 859                 ieee80211_deliver_data(vap, ni, m);
 860                 return IEEE80211_FC0_TYPE_DATA;
 861
 862         case IEEE80211_FC0_TYPE_MGT:
 863                 vap->iv_stats.is_rx_mgmt++;
 864                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 865                 if (dir != IEEE80211_FC1_DIR_NODS) {
 866                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 867                             wh, "data", "incorrect dir 0x%x", dir);
 868                         vap->iv_stats.is_rx_wrongdir++;
 869                         goto err;
 870                 }
 871                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 872                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 873                             ni->ni_macaddr, "mgt", "too short: len %u",
 874                             m->m_pkthdr.len);
 875                         vap->iv_stats.is_rx_tooshort++;
 876                         goto out;
 877                 }
 878 #ifdef IEEE80211_DEBUG
 879                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 880                     ieee80211_msg_dumppkts(vap)) {
 881                         if_printf(ifp, "received %s from %s rssi %d\n",
 882                             ieee80211_mgt_subtype_name(subtype),
 883                             ether_sprintf(wh->i_addr2), rssi);
 884                 }
 885 #endif
 886                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 887                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 888                                 /*
 889                                  * Only shared key auth frames with a challenge
 890                                  * should be encrypted, discard all others.
 891                                  */
 892                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 893                                     wh, ieee80211_mgt_subtype_name(subtype),
 894                                     "%s", "WEP set but not permitted");
 895                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 896                                 goto out;
 897                         }
 898                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 899                                 /*
 900                                  * Discard encrypted frames when privacy is off.
 901                                  */
 902                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 903                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 904                                 vap->iv_stats.is_rx_noprivacy++;
 905                                 goto out;
 906                         }
 907                         hdrspace = ieee80211_hdrspace(ic, wh);
 908                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 909                         if (key == NULL) {
 910                                 /* NB: stats+msgs handled in crypto_decap */
 911                                 goto out;
 912                         }
 913                         wh = mtod(m, struct ieee80211_frame *);
 914                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 915                 }
 916                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 917                 goto out;
 918
 919         case IEEE80211_FC0_TYPE_CTL:
 920                 vap->iv_stats.is_rx_ctl++;
 921                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 922                 vap->iv_recv_ctl(ni, m, subtype);
 923                 goto out;
 924
 925         default:
 926                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 927                     wh, NULL, "bad frame type 0x%x", type);
 928                 /* should not come here */
 929                 break;
 930         }
 931 err:
 932         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 933 out:
 934         if (m != NULL) {
 935                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 936                         ieee80211_radiotap_rx(vap, m);
 937                 m_freem(m);
 938         }
 939         return type;
 940 }
 941
 942 static void
 943 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 944     int rssi, int nf, uint16_t seq, uint16_t status)
 945 {
 946         struct ieee80211vap *vap = ni->ni_vap;
 947
 948         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 949                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 950                     ni->ni_macaddr, "open auth",
 951                     "bad sta auth mode %u", ni->ni_authmode);
 952                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 953                 return;
 954         }
 955         if (vap->iv_state != IEEE80211_S_AUTH ||
 956             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
 957                 vap->iv_stats.is_rx_bad_auth++;
 958                 return;
 959         }
 960         if (status != 0) {
 961                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 962                     ni, "open auth failed (reason %d)", status);
 963                 vap->iv_stats.is_rx_auth_fail++;
 964                 vap->iv_stats.is_rx_authfail_code = status;
 965                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 966                     IEEE80211_SCAN_FAIL_STATUS);
 967         } else
 968                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 969 }
 970
 971 static void
 972 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 973     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 974     uint16_t seq, uint16_t status)
 975 {
 976         struct ieee80211vap *vap = ni->ni_vap;
 977         uint8_t *challenge;
 978
 979         /*
 980          * NB: this can happen as we allow pre-shared key
 981          * authentication to be enabled w/o wep being turned
 982          * on so that configuration of these can be done
 983          * in any order.  It may be better to enforce the
 984          * ordering in which case this check would just be
 985          * for sanity/consistency.
 986          */
 987         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 988                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 989                     ni->ni_macaddr, "shared key auth",
 990                     "%s", " PRIVACY is disabled");
 991                 goto bad;
 992         }
 993         /*
 994          * Pre-shared key authentication is evil; accept
 995          * it only if explicitly configured (it is supported
 996          * mainly for compatibility with clients like OS X).
 997          */
 998         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
 999             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1000                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1001                     ni->ni_macaddr, "shared key auth",
1002                     "bad sta auth mode %u", ni->ni_authmode);
1003                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1004                 goto bad;
1005         }
1006
1007         challenge = NULL;
1008         if (frm + 1 < efrm) {
1009                 if ((frm[1] + 2) > (efrm - frm)) {
1010                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1011                             ni->ni_macaddr, "shared key auth",
1012                             "ie %d/%d too long",
1013                             frm[0], (frm[1] + 2) - (efrm - frm));
1014                         vap->iv_stats.is_rx_bad_auth++;
1015                         goto bad;
1016                 }
1017                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1018                         challenge = frm;
1019                 frm += frm[1] + 2;
1020         }
1021         switch (seq) {
1022         case IEEE80211_AUTH_SHARED_CHALLENGE:
1023         case IEEE80211_AUTH_SHARED_RESPONSE:
1024                 if (challenge == NULL) {
1025                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1026                             ni->ni_macaddr, "shared key auth",
1027                             "%s", "no challenge");
1028                         vap->iv_stats.is_rx_bad_auth++;
1029                         goto bad;
1030                 }
1031                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1032                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1033                             ni->ni_macaddr, "shared key auth",
1034                             "bad challenge len %d", challenge[1]);
1035                         vap->iv_stats.is_rx_bad_auth++;
1036                         goto bad;
1037                 }
1038         default:
1039                 break;
1040         }
1041         if (vap->iv_state != IEEE80211_S_AUTH)
1042                 return;
1043         switch (seq) {
1044         case IEEE80211_AUTH_SHARED_PASS:
1045                 if (ni->ni_challenge != NULL) {
1046                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1047                         ni->ni_challenge = NULL;
1048                 }
1049                 if (status != 0) {
1050                         IEEE80211_NOTE_FRAME(vap,
1051                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1052                             "shared key auth failed (reason %d)", status);
1053                         vap->iv_stats.is_rx_auth_fail++;
1054                         vap->iv_stats.is_rx_authfail_code = status;
1055                         return;
1056                 }
1057                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1058                 break;
1059         case IEEE80211_AUTH_SHARED_CHALLENGE:
1060                 if (!ieee80211_alloc_challenge(ni))
1061                         return;
1062                 /* XXX could optimize by passing recvd challenge */
1063                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1064                 IEEE80211_SEND_MGMT(ni,
1065                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1066                 break;
1067         default:
1068                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1069                     wh, "shared key auth", "bad seq %d", seq);
1070                 vap->iv_stats.is_rx_bad_auth++;
1071                 return;
1072         }
1073         return;
1074 bad:
1075         /*
1076          * Kick the state machine.  This short-circuits
1077          * using the mgt frame timeout to trigger the
1078          * state transition.
1079          */
1080         if (vap->iv_state == IEEE80211_S_AUTH)
1081                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1082                     IEEE80211_SCAN_FAIL_STATUS);
1083 }
1084
1085 int
1086 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1087         const struct ieee80211_frame *wh)
1088 {
1089 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1090         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1091         u_int len = frm[1], qosinfo;
1092         int i;
1093
1094         if (len < sizeof(struct ieee80211_wme_param)-2) {
1095                 IEEE80211_DISCARD_IE(vap,
1096                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1097                     wh, "WME", "too short, len %u", len);
1098                 return -1;
1099         }
1100         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1101         qosinfo &= WME_QOSINFO_COUNT;
1102         /* XXX do proper check for wraparound */
1103         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1104                 return 0;
1105         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1106         for (i = 0; i < WME_NUM_AC; i++) {
1107                 struct wmeParams *wmep =
1108                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1109                 /* NB: ACI not used */
1110                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1111                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1112                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1113                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1114                 wmep->wmep_txopLimit = le16dec(frm+2);
1115                 frm += 4;
1116         }
1117         wme->wme_wmeChanParams.cap_info = qosinfo;
1118         return 1;
1119 #undef MS
1120 }
1121
1122 /*
1123  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1124  * is the first CSA then initiate the switch.  Otherwise we
1125  * track state and trigger completion and/or cancel of the switch.
1126  * XXX should be public for IBSS use
1127  */
1128 static void
1129 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1130         const struct ieee80211_frame *wh)
1131 {
1132         struct ieee80211com *ic = vap->iv_ic;
1133         const struct ieee80211_csa_ie *csa =
1134             (const struct ieee80211_csa_ie *) frm;
1135
1136         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1137             ("state %s", ieee80211_state_name[vap->iv_state]));
1138
1139         if (csa->csa_mode > 1) {
1140                 IEEE80211_DISCARD_IE(vap,
1141                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1142                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1143                 return;
1144         }
1145         IEEE80211_LOCK(ic);
1146         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1147                 /*
1148                  * Convert the channel number to a channel reference.  We
1149                  * try first to preserve turbo attribute of the current
1150                  * channel then fallback.  Note this will not work if the
1151                  * CSA specifies a channel that requires a band switch (e.g.
1152                  * 11a => 11g).  This is intentional as 11h is defined only
1153                  * for 5GHz/11a and because the switch does not involve a
1154                  * reassociation, protocol state (capabilities, negotated
1155                  * rates, etc) may/will be wrong.
1156                  */
1157                 struct ieee80211_channel *c =
1158                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1159                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1160                 if (c == NULL) {
1161                         c = ieee80211_find_channel_byieee(ic,
1162                             csa->csa_newchan,
1163                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1164                         if (c == NULL) {
1165                                 IEEE80211_DISCARD_IE(vap,
1166                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1167                                     wh, "CSA", "invalid channel %u",
1168                                     csa->csa_newchan);
1169                                 goto done;
1170                         }
1171                 }
1172 #if IEEE80211_CSA_COUNT_MIN > 0
1173                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1174                         /*
1175                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1176                          * reduce the risk of being redirected by a fabricated
1177                          * CSA.  If a valid CSA is dropped we'll still get a
1178                          * beacon miss when the AP leaves the channel so we'll
1179                          * eventually follow to the new channel.
1180                          *
1181                          * NOTE: this violates the 11h spec that states that
1182                          * count may be any value and if 0 then a switch
1183                          * should happen asap.
1184                          */
1185                         IEEE80211_DISCARD_IE(vap,
1186                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1187                             wh, "CSA", "count %u too small, must be >= %u",
1188                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1189                         goto done;
1190                 }
1191 #endif
1192                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1193         } else {
1194                 /*
1195                  * Validate this ie against the initial CSA.  We require
1196                  * mode and channel not change and the count must be
1197                  * monotonically decreasing.  This may be pointless and
1198                  * canceling the switch as a result may be too paranoid but
1199                  * in the worst case if we drop out of CSA because of this
1200                  * and the AP does move then we'll just end up taking a
1201                  * beacon miss and scan to find the AP.
1202                  *
1203                  * XXX may want <= on count as we also process ProbeResp
1204                  * frames and those may come in w/ the same count as the
1205                  * previous beacon; but doing so leaves us open to a stuck
1206                  * count until we add a dead-man timer
1207                  */
1208                 if (!(csa->csa_count < ic->ic_csa_count &&
1209                       csa->csa_mode == ic->ic_csa_mode &&
1210                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1211                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1212                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1213                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1214                             ic->ic_csa_newchan, ic->ic_csa_count,
1215                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1216                         ieee80211_csa_cancelswitch(ic);
1217                 } else {
1218                         if (csa->csa_count <= 1)
1219                                 ieee80211_csa_completeswitch(ic);
1220                         else
1221                                 ic->ic_csa_count = csa->csa_count;
1222                 }
1223         }
1224 done:
1225         IEEE80211_UNLOCK(ic);
1226 }
1227
1228 /*
1229  * Return non-zero if a background scan may be continued:
1230  * o bg scan is active
1231  * o no channel switch is pending
1232  * o there has not been any traffic recently
1233  *
1234  * Note we do not check if there is an administrative enable;
1235  * this is only done to start the scan.  We assume that any
1236  * change in state will be accompanied by a request to cancel
1237  * active scans which will otherwise cause this test to fail.
1238  */
1239 static __inline int
1240 contbgscan(struct ieee80211vap *vap)
1241 {
1242         struct ieee80211com *ic = vap->iv_ic;
1243
1244         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1245             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1246             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1247             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1248 }
1249
1250 /*
1251  * Return non-zero if a backgrond scan may be started:
1252  * o bg scanning is administratively enabled
1253  * o no channel switch is pending
1254  * o we are not boosted on a dynamic turbo channel
1255  * o there has not been a scan recently
1256  * o there has not been any traffic recently
1257  */
1258 static __inline int
1259 startbgscan(struct ieee80211vap *vap)
1260 {
1261         struct ieee80211com *ic = vap->iv_ic;
1262
1263         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1264             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1265 #ifdef IEEE80211_SUPPORT_SUPERG
1266             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1267 #endif
1268             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1269             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1270 }
1271
1272 static void
1273 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1274     const struct ieee80211_rx_stats *rxs,
1275     int rssi, int nf)
1276 {
1277 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1278         struct ieee80211vap *vap = ni->ni_vap;
1279         struct ieee80211com *ic = ni->ni_ic;
1280         struct ieee80211_channel *rxchan = ic->ic_curchan;
1281         struct ieee80211_frame *wh;
1282         uint8_t *frm, *efrm;
1283         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1284         uint8_t rate;
1285         int ht_state_change = 0;
1286
1287         wh = mtod(m0, struct ieee80211_frame *);
1288         frm = (uint8_t *)&wh[1];
1289         efrm = mtod(m0, uint8_t *) + m0->m_len;
1290         switch (subtype) {
1291         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1292         case IEEE80211_FC0_SUBTYPE_BEACON: {
1293                 struct ieee80211_scanparams scan;
1294                 struct ieee80211_channel *c;
1295                 /*
1296                  * We process beacon/probe response frames:
1297                  *    o when scanning, or
1298                  *    o station mode when associated (to collect state
1299                  *      updates such as 802.11g slot time)
1300                  * Frames otherwise received are discarded.
1301                  */
1302                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1303                         vap->iv_stats.is_rx_mgtdiscard++;
1304                         return;
1305                 }
1306
1307                 /* Override RX channel as appropriate */
1308                 if (rxs != NULL) {
1309                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1310                         if (c != NULL)
1311                                 rxchan = c;
1312                 }
1313
1314                 /* XXX probe response in sta mode when !scanning? */
1315                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1316                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1317                                 vap->iv_stats.is_beacon_bad++;
1318                         return;
1319                 }
1320
1321                 /*
1322                  * Count frame now that we know it's to be processed.
1323                  */
1324                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1325                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1326                         IEEE80211_NODE_STAT(ni, rx_beacons);
1327                 } else
1328                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1329                 /*
1330                  * When operating in station mode, check for state updates.
1331                  * Be careful to ignore beacons received while doing a
1332                  * background scan.  We consider only 11g/WMM stuff right now.
1333                  */
1334                 if (ni->ni_associd != 0 &&
1335                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1336                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1337                         /* record tsf of last beacon */
1338                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1339                                 sizeof(ni->ni_tstamp));
1340                         /* count beacon frame for s/w bmiss handling */
1341                         vap->iv_swbmiss_count++;
1342                         vap->iv_bmiss_count = 0;
1343                         if (ni->ni_erp != scan.erp) {
1344                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1345                                     wh->i_addr2,
1346                                     "erp change: was 0x%x, now 0x%x",
1347                                     ni->ni_erp, scan.erp);
1348                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1349                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1350                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1351                                 else
1352                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1353                                 ni->ni_erp = scan.erp;
1354                                 /* XXX statistic */
1355                                 /* XXX driver notification */
1356                         }
1357                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1358                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1359                                     wh->i_addr2,
1360                                     "capabilities change: was 0x%x, now 0x%x",
1361                                     ni->ni_capinfo, scan.capinfo);
1362                                 /*
1363                                  * NB: we assume short preamble doesn't
1364                                  *     change dynamically
1365                                  */
1366                                 ieee80211_set_shortslottime(ic,
1367                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1368                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1369                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1370                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1371                                 /* XXX statistic */
1372                         }
1373                         if (scan.wme != NULL &&
1374                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1375                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1376                                 ieee80211_wme_updateparams(vap);
1377 #ifdef IEEE80211_SUPPORT_SUPERG
1378                         if (scan.ath != NULL)
1379                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1380 #endif
1381                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1382                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1383                                 /* XXX state changes? */
1384                                 if (ieee80211_ht_updateparams(ni,
1385                                     scan.htcap, scan.htinfo))
1386                                         ht_state_change = 1;
1387                         }
1388                         if (scan.quiet)
1389                                 ic->ic_set_quiet(ni, scan.quiet);
1390
1391                         if (scan.tim != NULL) {
1392                                 struct ieee80211_tim_ie *tim =
1393                                     (struct ieee80211_tim_ie *) scan.tim;
1394                                 /*
1395                                  * XXX Check/debug this code; see if it's about
1396                                  * the right time to force the VAP awake if we
1397                                  * receive a frame destined for us?
1398                                  */
1399                                 int aid = IEEE80211_AID(ni->ni_associd);
1400                                 int ix = aid / NBBY;
1401                                 int min = tim->tim_bitctl &~ 1;
1402                                 int max = tim->tim_len + min - 4;
1403                                 int tim_ucast = 0, tim_mcast = 0;
1404
1405                                 /*
1406                                  * Only do this for unicast traffic in the TIM
1407                                  * The multicast traffic notification for
1408                                  * the scan notification stuff should occur
1409                                  * differently.
1410                                  */
1411                                 if (min <= ix && ix <= max &&
1412                                      isset(tim->tim_bitmap - min, aid)) {
1413                                         tim_ucast = 1;
1414                                 }
1415
1416                                 /*
1417                                  * Do a separate notification
1418                                  * for the multicast bit being set.
1419                                  */
1420                                 if (tim->tim_bitctl & 1) {
1421                                         tim_mcast = 1;
1422                                 }
1423
1424                                 /*
1425                                  * If the TIM indicates there's traffic for
1426                                  * us then get us out of STA mode powersave.
1427                                  */
1428                                 if (tim_ucast == 1) {
1429
1430                                         /*
1431                                          * Wake us out of SLEEP state if we're
1432                                          * in it; and if we're doing bgscan
1433                                          * then wake us out of STA powersave.
1434                                          */
1435                                         ieee80211_sta_tim_notify(vap, 1);
1436
1437                                         /*
1438                                          * This is preventing us from
1439                                          * continuing a bgscan; because it
1440                                          * tricks the contbgscan()
1441                                          * routine to think there's always
1442                                          * traffic for us.
1443                                          *
1444                                          * I think we need both an RX and
1445                                          * TX ic_lastdata field.
1446                                          */
1447                                         ic->ic_lastdata = ticks;
1448                                 }
1449
1450                                 ni->ni_dtim_count = tim->tim_count;
1451                                 ni->ni_dtim_period = tim->tim_period;
1452                         }
1453                         if (scan.csa != NULL &&
1454                             (vap->iv_flags & IEEE80211_F_DOTH))
1455                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1456                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1457                                 /*
1458                                  * No CSA ie or 11h disabled, but a channel
1459                                  * switch is pending; drop out so we aren't
1460                                  * stuck in CSA state.  If the AP really is
1461                                  * moving we'll get a beacon miss and scan.
1462                                  */
1463                                 IEEE80211_LOCK(ic);
1464                                 ieee80211_csa_cancelswitch(ic);
1465                                 IEEE80211_UNLOCK(ic);
1466                         }
1467                         /*
1468                          * If scanning, pass the info to the scan module.
1469                          * Otherwise, check if it's the right time to do
1470                          * a background scan.  Background scanning must
1471                          * be enabled and we must not be operating in the
1472                          * turbo phase of dynamic turbo mode.  Then,
1473                          * it's been a while since the last background
1474                          * scan and if no data frames have come through
1475                          * recently, kick off a scan.  Note that this
1476                          * is the mechanism by which a background scan
1477                          * is started _and_ continued each time we
1478                          * return on-channel to receive a beacon from
1479                          * our ap.
1480                          */
1481                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1482                                 ieee80211_add_scan(vap, rxchan,
1483                                     &scan, wh, subtype, rssi, nf);
1484                         } else if (contbgscan(vap)) {
1485                                 ieee80211_bg_scan(vap, 0);
1486                         } else if (startbgscan(vap)) {
1487                                 vap->iv_stats.is_scan_bg++;
1488 #if 0
1489                                 /* wakeup if we are sleeing */
1490                                 ieee80211_set_pwrsave(vap, 0);
1491 #endif
1492                                 ieee80211_bg_scan(vap, 0);
1493                         }
1494
1495                         /*
1496                          * Put the station to sleep if we haven't seen
1497                          * traffic in a while.
1498                          */
1499                         IEEE80211_LOCK(ic);
1500                         ieee80211_sta_ps_timer_check(vap);
1501                         IEEE80211_UNLOCK(ic);
1502
1503                         /*
1504                          * If we've had a channel width change (eg HT20<->HT40)
1505                          * then schedule a delayed driver notification.
1506                          */
1507                         if (ht_state_change)
1508                                 ieee80211_update_chw(ic);
1509                         return;
1510                 }
1511                 /*
1512                  * If scanning, just pass information to the scan module.
1513                  */
1514                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1515                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1516                                 /*
1517                                  * Actively scanning a channel marked passive;
1518                                  * send a probe request now that we know there
1519                                  * is 802.11 traffic present.
1520                                  *
1521                                  * XXX check if the beacon we recv'd gives
1522                                  * us what we need and suppress the probe req
1523                                  */
1524                                 ieee80211_probe_curchan(vap, 1);
1525                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1526                         }
1527                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1528                             subtype, rssi, nf);
1529                         return;
1530                 }
1531                 break;
1532         }
1533
1534         case IEEE80211_FC0_SUBTYPE_AUTH: {
1535                 uint16_t algo, seq, status;
1536                 /*
1537                  * auth frame format
1538                  *      [2] algorithm
1539                  *      [2] sequence
1540                  *      [2] status
1541                  *      [tlv*] challenge
1542                  */
1543                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1544                 algo   = le16toh(*(uint16_t *)frm);
1545                 seq    = le16toh(*(uint16_t *)(frm + 2));
1546                 status = le16toh(*(uint16_t *)(frm + 4));
1547                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1548                     "recv auth frame with algorithm %d seq %d", algo, seq);
1549
1550                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1551                         IEEE80211_DISCARD(vap,
1552                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1553                             wh, "auth", "%s", "TKIP countermeasures enabled");
1554                         vap->iv_stats.is_rx_auth_countermeasures++;
1555                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1556                                 ieee80211_send_error(ni, wh->i_addr2,
1557                                         IEEE80211_FC0_SUBTYPE_AUTH,
1558                                         IEEE80211_REASON_MIC_FAILURE);
1559                         }
1560                         return;
1561                 }
1562                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1563                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1564                             seq, status);
1565                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1566                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1567                 else {
1568                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1569                             wh, "auth", "unsupported alg %d", algo);
1570                         vap->iv_stats.is_rx_auth_unsupported++;
1571                         return;
1572                 }
1573                 break;
1574         }
1575
1576         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1577         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1578                 uint16_t capinfo, associd;
1579                 uint16_t status;
1580
1581                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1582                         vap->iv_stats.is_rx_mgtdiscard++;
1583                         return;
1584                 }
1585
1586                 /*
1587                  * asresp frame format
1588                  *      [2] capability information
1589                  *      [2] status
1590                  *      [2] association ID
1591                  *      [tlv] supported rates
1592                  *      [tlv] extended supported rates
1593                  *      [tlv] WME
1594                  *      [tlv] HT capabilities
1595                  *      [tlv] HT info
1596                  */
1597                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1598                 ni = vap->iv_bss;
1599                 capinfo = le16toh(*(uint16_t *)frm);
1600                 frm += 2;
1601                 status = le16toh(*(uint16_t *)frm);
1602                 frm += 2;
1603                 if (status != 0) {
1604                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1605                             wh->i_addr2, "%sassoc failed (reason %d)",
1606                             ISREASSOC(subtype) ?  "re" : "", status);
1607                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1608                         return;
1609                 }
1610                 associd = le16toh(*(uint16_t *)frm);
1611                 frm += 2;
1612
1613                 rates = xrates = wme = htcap = htinfo = NULL;
1614                 while (efrm - frm > 1) {
1615                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1616                         switch (*frm) {
1617                         case IEEE80211_ELEMID_RATES:
1618                                 rates = frm;
1619                                 break;
1620                         case IEEE80211_ELEMID_XRATES:
1621                                 xrates = frm;
1622                                 break;
1623                         case IEEE80211_ELEMID_HTCAP:
1624                                 htcap = frm;
1625                                 break;
1626                         case IEEE80211_ELEMID_HTINFO:
1627                                 htinfo = frm;
1628                                 break;
1629                         case IEEE80211_ELEMID_VENDOR:
1630                                 if (iswmeoui(frm))
1631                                         wme = frm;
1632                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1633                                         /*
1634                                          * Accept pre-draft HT ie's if the
1635                                          * standard ones have not been seen.
1636                                          */
1637                                         if (ishtcapoui(frm)) {
1638                                                 if (htcap == NULL)
1639                                                         htcap = frm;
1640                                         } else if (ishtinfooui(frm)) {
1641                                                 if (htinfo == NULL)
1642                                                         htinfo = frm;
1643                                         }
1644                                 }
1645                                 /* XXX Atheros OUI support */
1646                                 break;
1647                         }
1648                         frm += frm[1] + 2;
1649                 }
1650
1651                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1652                 if (xrates != NULL)
1653                         IEEE80211_VERIFY_ELEMENT(xrates,
1654                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1655                 rate = ieee80211_setup_rates(ni, rates, xrates,
1656                                 IEEE80211_F_JOIN |
1657                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1658                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1659                 if (rate & IEEE80211_RATE_BASIC) {
1660                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1661                             wh->i_addr2,
1662                             "%sassoc failed (rate set mismatch)",
1663                             ISREASSOC(subtype) ?  "re" : "");
1664                         vap->iv_stats.is_rx_assoc_norate++;
1665                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1666                             IEEE80211_SCAN_FAIL_STATUS);
1667                         return;
1668                 }
1669
1670                 ni->ni_capinfo = capinfo;
1671                 ni->ni_associd = associd;
1672                 if (ni->ni_jointime == 0)
1673                         ni->ni_jointime = time_uptime;
1674                 if (wme != NULL &&
1675                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1676                         ni->ni_flags |= IEEE80211_NODE_QOS;
1677                         ieee80211_wme_updateparams(vap);
1678                 } else
1679                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1680                 /*
1681                  * Setup HT state according to the negotiation.
1682                  *
1683                  * NB: shouldn't need to check if HT use is enabled but some
1684                  *     ap's send back HT ie's even when we don't indicate we
1685                  *     are HT capable in our AssocReq.
1686                  */
1687                 if (htcap != NULL && htinfo != NULL &&
1688                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1689                         ieee80211_ht_node_init(ni);
1690                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1691                         ieee80211_setup_htrates(ni, htcap,
1692                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1693                         ieee80211_setup_basic_htrates(ni, htinfo);
1694                         ieee80211_node_setuptxparms(ni);
1695                         ieee80211_ratectl_node_init(ni);
1696                 }
1697
1698                 /*
1699                  * Always initialise FF/superg state; we can use this
1700                  * for doing A-MSDU encapsulation as well.
1701                  */
1702 #ifdef  IEEE80211_SUPPORT_SUPERG
1703                 ieee80211_ff_node_init(ni);
1704 #endif
1705
1706                 /*
1707                  * Configure state now that we are associated.
1708                  *
1709                  * XXX may need different/additional driver callbacks?
1710                  */
1711                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1712                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1713                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1714                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1715                 } else {
1716                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1717                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1718                 }
1719                 ieee80211_set_shortslottime(ic,
1720                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1721                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1722                 /*
1723                  * Honor ERP protection.
1724                  *
1725                  * NB: ni_erp should zero for non-11g operation.
1726                  */
1727                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1728                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1729                         ic->ic_flags |= IEEE80211_F_USEPROT;
1730                 else
1731                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1732                 IEEE80211_NOTE_MAC(vap,
1733                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1734                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1735                     ISREASSOC(subtype) ? "re" : "",
1736                     IEEE80211_NODE_AID(ni),
1737                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1738                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1739                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1740                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1741                     ni->ni_flags & IEEE80211_NODE_HT ?
1742                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1743                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1744                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1745                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1746                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1747                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1748                         ", fast-frames" : "",
1749                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1750                         ", turbo" : ""
1751                 );
1752                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1753                 break;
1754         }
1755
1756         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1757                 uint16_t reason;
1758
1759                 if (vap->iv_state == IEEE80211_S_SCAN) {
1760                         vap->iv_stats.is_rx_mgtdiscard++;
1761                         return;
1762                 }
1763                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1764                         /* NB: can happen when in promiscuous mode */
1765                         vap->iv_stats.is_rx_mgtdiscard++;
1766                         break;
1767                 }
1768
1769                 /*
1770                  * deauth frame format
1771                  *      [2] reason
1772                  */
1773                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1774                 reason = le16toh(*(uint16_t *)frm);
1775
1776                 vap->iv_stats.is_rx_deauth++;
1777                 vap->iv_stats.is_rx_deauth_code = reason;
1778                 IEEE80211_NODE_STAT(ni, rx_deauth);
1779
1780                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1781                     "recv deauthenticate (reason: %d (%s))", reason,
1782                     ieee80211_reason_to_string(reason));
1783                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1784                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1785                 break;
1786         }
1787
1788         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1789                 uint16_t reason;
1790
1791                 if (vap->iv_state != IEEE80211_S_RUN &&
1792                     vap->iv_state != IEEE80211_S_ASSOC &&
1793                     vap->iv_state != IEEE80211_S_AUTH) {
1794                         vap->iv_stats.is_rx_mgtdiscard++;
1795                         return;
1796                 }
1797                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1798                         /* NB: can happen when in promiscuous mode */
1799                         vap->iv_stats.is_rx_mgtdiscard++;
1800                         break;
1801                 }
1802
1803                 /*
1804                  * disassoc frame format
1805                  *      [2] reason
1806                  */
1807                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1808                 reason = le16toh(*(uint16_t *)frm);
1809
1810                 vap->iv_stats.is_rx_disassoc++;
1811                 vap->iv_stats.is_rx_disassoc_code = reason;
1812                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1813
1814                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1815                     "recv disassociate (reason: %d (%s))", reason,
1816                     ieee80211_reason_to_string(reason));
1817                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1818                 break;
1819         }
1820
1821         case IEEE80211_FC0_SUBTYPE_ACTION:
1822         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1823                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1824                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1825                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1826                             wh, NULL, "%s", "not for us");
1827                         vap->iv_stats.is_rx_mgtdiscard++;
1828                 } else if (vap->iv_state != IEEE80211_S_RUN) {
1829                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1830                             wh, NULL, "wrong state %s",
1831                             ieee80211_state_name[vap->iv_state]);
1832                         vap->iv_stats.is_rx_mgtdiscard++;
1833                 } else {
1834                         if (ieee80211_parse_action(ni, m0) == 0)
1835                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1836                 }
1837                 break;
1838
1839         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1840         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1841         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1842         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1843         case IEEE80211_FC0_SUBTYPE_ATIM:
1844                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1845                     wh, NULL, "%s", "not handled");
1846                 vap->iv_stats.is_rx_mgtdiscard++;
1847                 break;
1848
1849         default:
1850                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1851                     wh, "mgt", "subtype 0x%x not handled", subtype);
1852                 vap->iv_stats.is_rx_badsubtype++;
1853                 break;
1854         }
1855 #undef ISREASSOC
1856 }
1857
1858 static void
1859 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1860 {
1861         switch (subtype) {
1862         case IEEE80211_FC0_SUBTYPE_BAR:
1863                 ieee80211_recv_bar(ni, m);
1864                 break;
1865         }
1866 }