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/ethernet.h>
  54
  55 #include <net/bpf.h>
  56
  57 #include <net80211/ieee80211_var.h>
  58 #include <net80211/ieee80211_sta.h>
  59 #include <net80211/ieee80211_input.h>
  60 #ifdef IEEE80211_SUPPORT_SUPERG
  61 #include <net80211/ieee80211_superg.h>
  62 #endif
  63 #include <net80211/ieee80211_ratectl.h>
  64
  65 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  66
  67 static  void sta_vattach(struct ieee80211vap *);
  68 static  void sta_beacon_miss(struct ieee80211vap *);
  69 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  70 static  int sta_input(struct ieee80211_node *, struct mbuf *, int, int);
  71 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  72             int subtype, int rssi, int nf);
  73 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  74
  75 void
  76 ieee80211_sta_attach(struct ieee80211com *ic)
  77 {
  78         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  79 }
  80
  81 void
  82 ieee80211_sta_detach(struct ieee80211com *ic)
  83 {
  84 }
  85
  86 static void
  87 sta_vdetach(struct ieee80211vap *vap)
  88 {
  89 }
  90
  91 static void
  92 sta_vattach(struct ieee80211vap *vap)
  93 {
  94         vap->iv_newstate = sta_newstate;
  95         vap->iv_input = sta_input;
  96         vap->iv_recv_mgmt = sta_recv_mgmt;
  97         vap->iv_recv_ctl = sta_recv_ctl;
  98         vap->iv_opdetach = sta_vdetach;
  99         vap->iv_bmiss = sta_beacon_miss;
 100 }
 101
 102 /*
 103  * Handle a beacon miss event.  The common code filters out
 104  * spurious events that can happen when scanning and/or before
 105  * reaching RUN state.
 106  */
 107 static void
 108 sta_beacon_miss(struct ieee80211vap *vap)
 109 {
 110         struct ieee80211com *ic = vap->iv_ic;
 111
 112         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 113         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 114             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 115
 116         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 117             "beacon miss, mode %s state %s\n",
 118             ieee80211_opmode_name[vap->iv_opmode],
 119             ieee80211_state_name[vap->iv_state]);
 120
 121         if (vap->iv_state == IEEE80211_S_CSA) {
 122                 /*
 123                  * A Channel Switch is pending; assume we missed the
 124                  * beacon that would've completed the process and just
 125                  * force the switch.  If we made a mistake we'll not
 126                  * find the AP on the new channel and fall back to a
 127                  * normal scan.
 128                  */
 129                 ieee80211_csa_completeswitch(ic);
 130                 return;
 131         }
 132         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 133                 /*
 134                  * Send a directed probe req before falling back to a
 135                  * scan; if we receive a response ic_bmiss_count will
 136                  * be reset.  Some cards mistakenly report beacon miss
 137                  * so this avoids the expensive scan if the ap is
 138                  * still there.
 139                  */
 140                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 141                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 142                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 143                 return;
 144         }
 145
 146         callout_stop(&vap->iv_swbmiss);
 147         vap->iv_bmiss_count = 0;
 148         vap->iv_stats.is_beacon_miss++;
 149         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 150 #ifdef IEEE80211_SUPPORT_SUPERG
 151                 struct ieee80211com *ic = vap->iv_ic;
 152
 153                 /*
 154                  * If we receive a beacon miss interrupt when using
 155                  * dynamic turbo, attempt to switch modes before
 156                  * reassociating.
 157                  */
 158                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 159                         ieee80211_dturbo_switch(vap,
 160                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 161 #endif
 162                 /*
 163                  * Try to reassociate before scanning for a new ap.
 164                  */
 165                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 166         } else {
 167                 /*
 168                  * Somebody else is controlling state changes (e.g.
 169                  * a user-mode app) don't do anything that would
 170                  * confuse them; just drop into scan mode so they'll
 171                  * notified of the state change and given control.
 172                  */
 173                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 174         }
 175 }
 176
 177 /*
 178  * Handle deauth with reason.  We retry only for
 179  * the cases where we might succeed.  Otherwise
 180  * we downgrade the ap and scan.
 181  */
 182 static void
 183 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 184 {
 185         switch (reason) {
 186         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 187         case IEEE80211_STATUS_TIMEOUT:
 188         case IEEE80211_REASON_ASSOC_EXPIRE:
 189         case IEEE80211_REASON_NOT_AUTHED:
 190         case IEEE80211_REASON_NOT_ASSOCED:
 191         case IEEE80211_REASON_ASSOC_LEAVE:
 192         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 193                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 194                 break;
 195         default:
 196                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 197                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 198                         ieee80211_check_scan_current(vap);
 199                 break;
 200         }
 201 }
 202
 203 /*
 204  * IEEE80211_M_STA vap state machine handler.
 205  * This routine handles the main states in the 802.11 protocol.
 206  */
 207 static int
 208 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 209 {
 210         struct ieee80211com *ic = vap->iv_ic;
 211         struct ieee80211_node *ni;
 212         enum ieee80211_state ostate;
 213
 214         IEEE80211_LOCK_ASSERT(ic);
 215
 216         ostate = vap->iv_state;
 217         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 218             __func__, ieee80211_state_name[ostate],
 219             ieee80211_state_name[nstate], arg);
 220         vap->iv_state = nstate;                 /* state transition */
 221         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 222         if (ostate != IEEE80211_S_SCAN)
 223                 ieee80211_cancel_scan(vap);     /* background scan */
 224         ni = vap->iv_bss;                       /* NB: no reference held */
 225         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 226                 callout_stop(&vap->iv_swbmiss);
 227         switch (nstate) {
 228         case IEEE80211_S_INIT:
 229                 switch (ostate) {
 230                 case IEEE80211_S_SLEEP:
 231                         /* XXX wakeup */
 232                 case IEEE80211_S_RUN:
 233                         IEEE80211_SEND_MGMT(ni,
 234                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 235                             IEEE80211_REASON_ASSOC_LEAVE);
 236                         ieee80211_sta_leave(ni);
 237                         break;
 238                 case IEEE80211_S_ASSOC:
 239                         IEEE80211_SEND_MGMT(ni,
 240                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 241                             IEEE80211_REASON_AUTH_LEAVE);
 242                         break;
 243                 case IEEE80211_S_SCAN:
 244                         ieee80211_cancel_scan(vap);
 245                         break;
 246                 default:
 247                         goto invalid;
 248                 }
 249                 if (ostate != IEEE80211_S_INIT) {
 250                         /* NB: optimize INIT -> INIT case */
 251                         ieee80211_reset_bss(vap);
 252                 }
 253                 if (vap->iv_auth->ia_detach != NULL)
 254                         vap->iv_auth->ia_detach(vap);
 255                 break;
 256         case IEEE80211_S_SCAN:
 257                 switch (ostate) {
 258                 case IEEE80211_S_INIT:
 259                         /*
 260                          * Initiate a scan.  We can come here as a result
 261                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 262                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 263                          * and the scan request parameters will be present
 264                          * in iv_scanreq.  Otherwise we do the default.
 265                          */
 266                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 267                                 ieee80211_check_scan(vap,
 268                                     vap->iv_scanreq_flags,
 269                                     vap->iv_scanreq_duration,
 270                                     vap->iv_scanreq_mindwell,
 271                                     vap->iv_scanreq_maxdwell,
 272                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 273                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 274                         } else
 275                                 ieee80211_check_scan_current(vap);
 276                         break;
 277                 case IEEE80211_S_SCAN:
 278                 case IEEE80211_S_AUTH:
 279                 case IEEE80211_S_ASSOC:
 280                         /*
 281                          * These can happen either because of a timeout
 282                          * on an assoc/auth response or because of a
 283                          * change in state that requires a reset.  For
 284                          * the former we're called with a non-zero arg
 285                          * that is the cause for the failure; pass this
 286                          * to the scan code so it can update state.
 287                          * Otherwise trigger a new scan unless we're in
 288                          * manual roaming mode in which case an application
 289                          * must issue an explicit scan request.
 290                          */
 291                         if (arg != 0)
 292                                 ieee80211_scan_assoc_fail(vap,
 293                                         vap->iv_bss->ni_macaddr, arg);
 294                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 295                                 ieee80211_check_scan_current(vap);
 296                         break;
 297                 case IEEE80211_S_RUN:           /* beacon miss */
 298                         /*
 299                          * Beacon miss.  Notify user space and if not
 300                          * under control of a user application (roaming
 301                          * manual) kick off a scan to re-connect.
 302                          */
 303                         ieee80211_sta_leave(ni);
 304                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 305                                 ieee80211_check_scan_current(vap);
 306                         break;
 307                 default:
 308                         goto invalid;
 309                 }
 310                 break;
 311         case IEEE80211_S_AUTH:
 312                 switch (ostate) {
 313                 case IEEE80211_S_INIT:
 314                 case IEEE80211_S_SCAN:
 315                         IEEE80211_SEND_MGMT(ni,
 316                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 317                         break;
 318                 case IEEE80211_S_AUTH:
 319                 case IEEE80211_S_ASSOC:
 320                         switch (arg & 0xff) {
 321                         case IEEE80211_FC0_SUBTYPE_AUTH:
 322                                 /* ??? */
 323                                 IEEE80211_SEND_MGMT(ni,
 324                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 325                                 break;
 326                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 327                                 sta_authretry(vap, ni, arg>>8);
 328                                 break;
 329                         }
 330                         break;
 331                 case IEEE80211_S_RUN:
 332                         switch (arg & 0xff) {
 333                         case IEEE80211_FC0_SUBTYPE_AUTH:
 334                                 IEEE80211_SEND_MGMT(ni,
 335                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 336                                 vap->iv_state = ostate; /* stay RUN */
 337                                 break;
 338                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 339                                 ieee80211_sta_leave(ni);
 340                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 341                                         /* try to reauth */
 342                                         IEEE80211_SEND_MGMT(ni,
 343                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 344                                 }
 345                                 break;
 346                         }
 347                         break;
 348                 default:
 349                         goto invalid;
 350                 }
 351                 break;
 352         case IEEE80211_S_ASSOC:
 353                 switch (ostate) {
 354                 case IEEE80211_S_AUTH:
 355                 case IEEE80211_S_ASSOC:
 356                         IEEE80211_SEND_MGMT(ni,
 357                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 358                         break;
 359                 case IEEE80211_S_SLEEP:         /* cannot happen */
 360                 case IEEE80211_S_RUN:
 361                         ieee80211_sta_leave(ni);
 362                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 363                                 IEEE80211_SEND_MGMT(ni, arg ?
 364                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 365                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 366                         }
 367                         break;
 368                 default:
 369                         goto invalid;
 370                 }
 371                 break;
 372         case IEEE80211_S_RUN:
 373                 if (vap->iv_flags & IEEE80211_F_WPA) {
 374                         /* XXX validate prerequisites */
 375                 }
 376                 switch (ostate) {
 377                 case IEEE80211_S_RUN:
 378                 case IEEE80211_S_CSA:
 379                         break;
 380                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 381                 case IEEE80211_S_ASSOC:
 382 #ifdef IEEE80211_DEBUG
 383                         if (ieee80211_msg_debug(vap)) {
 384                                 ieee80211_note(vap, "%s with %s ssid ",
 385                                     (vap->iv_opmode == IEEE80211_M_STA ?
 386                                     "associated" : "synchronized"),
 387                                     ether_sprintf(ni->ni_bssid));
 388                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 389                                     ni->ni_esslen);
 390                                 /* XXX MCS/HT */
 391                                 printf(" channel %d start %uMb\n",
 392                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 393                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 394                         }
 395 #endif
 396                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 397                         ieee80211_notify_node_join(ni,
 398                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 399                         break;
 400                 case IEEE80211_S_SLEEP:
 401                         ieee80211_sta_pwrsave(vap, 0);
 402                         break;
 403                 default:
 404                         goto invalid;
 405                 }
 406                 ieee80211_sync_curchan(ic);
 407                 if (ostate != IEEE80211_S_RUN &&
 408                     (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
 409                         /*
 410                          * Start s/w beacon miss timer for devices w/o
 411                          * hardware support.  We fudge a bit here since
 412                          * we're doing this in software.
 413                          */
 414                         vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 415                                 2 * vap->iv_bmissthreshold * ni->ni_intval);
 416                         vap->iv_swbmiss_count = 0;
 417                         callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 418                                 ieee80211_swbmiss, vap);
 419                 }
 420                 /*
 421                  * When 802.1x is not in use mark the port authorized
 422                  * at this point so traffic can flow.
 423                  */
 424                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 425                         ieee80211_node_authorize(ni);
 426                 /*
 427                  * Fake association when joining an existing bss.
 428                  */
 429                 if (ic->ic_newassoc != NULL)
 430                         ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
 431                 break;
 432         case IEEE80211_S_CSA:
 433                 if (ostate != IEEE80211_S_RUN)
 434                         goto invalid;
 435                 break;
 436         case IEEE80211_S_SLEEP:
 437                 ieee80211_sta_pwrsave(vap, 1);
 438                 break;
 439         default:
 440         invalid:
 441                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 442                     "%s: unexpected state transition %s -> %s\n", __func__,
 443                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 444                 break;
 445         }
 446         return 0;
 447 }
 448
 449 /*
 450  * Return non-zero if the frame is an echo of a multicast
 451  * frame sent by ourself.  The dir is known to be DSTODS.
 452  */
 453 static __inline int
 454 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 455 {
 456 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 457 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 458         const uint8_t *sa;
 459
 460         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 461
 462         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 463                 return 0;
 464         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 465         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 466 #undef WH4
 467 #undef QWH4
 468 }
 469
 470 /*
 471  * Return non-zero if the frame is an echo of a multicast
 472  * frame sent by ourself.  The dir is known to be FROMDS.
 473  */
 474 static __inline int
 475 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 476 {
 477         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 478
 479         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 480                 return 0;
 481         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 482 }
 483
 484 /*
 485  * Decide if a received management frame should be
 486  * printed when debugging is enabled.  This filters some
 487  * of the less interesting frames that come frequently
 488  * (e.g. beacons).
 489  */
 490 static __inline int
 491 doprint(struct ieee80211vap *vap, int subtype)
 492 {
 493         switch (subtype) {
 494         case IEEE80211_FC0_SUBTYPE_BEACON:
 495                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 496         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 497                 return 0;
 498         }
 499         return 1;
 500 }
 501
 502 /*
 503  * Process a received frame.  The node associated with the sender
 504  * should be supplied.  If nothing was found in the node table then
 505  * the caller is assumed to supply a reference to iv_bss instead.
 506  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 507  * during AP scanning to select a AP to associate with; it can have
 508  * any units so long as values have consistent units and higher values
 509  * mean ``better signal''.  The receive timestamp is currently not used
 510  * by the 802.11 layer.
 511  */
 512 static int
 513 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 514 {
 515 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 516         struct ieee80211vap *vap = ni->ni_vap;
 517         struct ieee80211com *ic = ni->ni_ic;
 518         struct ifnet *ifp = vap->iv_ifp;
 519         struct ieee80211_frame *wh;
 520         struct ieee80211_key *key;
 521         struct ether_header *eh;
 522         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 523         uint8_t dir, type, subtype, qos;
 524         uint8_t *bssid;
 525         uint16_t rxseq;
 526
 527         if (m->m_flags & M_AMPDU_MPDU) {
 528                 /*
 529                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 530                  * w/ M_AMPDU_MPDU marked have already passed through
 531                  * here but were received out of order and been held on
 532                  * the reorder queue.  When resubmitted they are marked
 533                  * with the M_AMPDU_MPDU flag and we can bypass most of
 534                  * the normal processing.
 535                  */
 536                 wh = mtod(m, struct ieee80211_frame *);
 537                 type = IEEE80211_FC0_TYPE_DATA;
 538                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 539                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 540                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 541                 goto resubmit_ampdu;
 542         }
 543
 544         KASSERT(ni != NULL, ("null node"));
 545         ni->ni_inact = ni->ni_inact_reload;
 546
 547         type = -1;                      /* undefined */
 548
 549         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 550                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 551                     ni->ni_macaddr, NULL,
 552                     "too short (1): len %u", m->m_pkthdr.len);
 553                 vap->iv_stats.is_rx_tooshort++;
 554                 goto out;
 555         }
 556         /*
 557          * Bit of a cheat here, we use a pointer for a 3-address
 558          * frame format but don't reference fields past outside
 559          * ieee80211_frame_min w/o first validating the data is
 560          * present.
 561          */
 562         wh = mtod(m, struct ieee80211_frame *);
 563
 564         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 565             IEEE80211_FC0_VERSION_0) {
 566                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 567                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 568                     wh->i_fc[0], wh->i_fc[1]);
 569                 vap->iv_stats.is_rx_badversion++;
 570                 goto err;
 571         }
 572
 573         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 574         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 575         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 576         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 577                 bssid = wh->i_addr2;
 578                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 579                         /* not interested in */
 580                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 581                             bssid, NULL, "%s", "not to bss");
 582                         vap->iv_stats.is_rx_wrongbss++;
 583                         goto out;
 584                 }
 585                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 586                 ni->ni_noise = nf;
 587                 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 588                         uint8_t tid = ieee80211_gettid(wh);
 589                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 590                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 591                                 ic->ic_wme.wme_hipri_traffic++;
 592                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 593                         if (! ieee80211_check_rxseq(ni, wh)) {
 594                                 /* duplicate, discard */
 595                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 596                                     bssid, "duplicate",
 597                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 598                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 599                                     ni->ni_rxseqs[tid] >>
 600                                         IEEE80211_SEQ_SEQ_SHIFT,
 601                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 602                                     ni->ni_rxseqs[tid] &
 603                                         IEEE80211_SEQ_FRAG_MASK,
 604                                     tid);
 605                                 vap->iv_stats.is_rx_dup++;
 606                                 IEEE80211_NODE_STAT(ni, rx_dup);
 607                                 goto out;
 608                         }
 609                         ni->ni_rxseqs[tid] = rxseq;
 610                 }
 611         }
 612
 613         switch (type) {
 614         case IEEE80211_FC0_TYPE_DATA:
 615                 hdrspace = ieee80211_hdrspace(ic, wh);
 616                 if (m->m_len < hdrspace &&
 617                     (m = m_pullup(m, hdrspace)) == NULL) {
 618                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 619                             ni->ni_macaddr, NULL,
 620                             "data too short: expecting %u", hdrspace);
 621                         vap->iv_stats.is_rx_tooshort++;
 622                         goto out;               /* XXX */
 623                 }
 624                 /*
 625                  * Handle A-MPDU re-ordering.  If the frame is to be
 626                  * processed directly then ieee80211_ampdu_reorder
 627                  * will return 0; otherwise it has consumed the mbuf
 628                  * and we should do nothing more with it.
 629                  */
 630                 if ((m->m_flags & M_AMPDU) &&
 631                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 632                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 633                     ieee80211_ampdu_reorder(ni, m) != 0) {
 634                         m = NULL;
 635                         goto out;
 636                 }
 637         resubmit_ampdu:
 638                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 639                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 640                             isfromds_mcastecho(vap, wh)) {
 641                                 /*
 642                                  * In IEEE802.11 network, multicast
 643                                  * packets sent from "me" are broadcast
 644                                  * from the AP; silently discard for
 645                                  * SIMPLEX interface.
 646                                  */
 647                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 648                                     wh, "data", "%s", "multicast echo");
 649                                 vap->iv_stats.is_rx_mcastecho++;
 650                                 goto out;
 651                         }
 652                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 653                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 654                                 /*
 655                                  * DWDS sta's must drop 3-address mcast frames
 656                                  * as they will be sent separately as a 4-addr
 657                                  * frame.  Accepting the 3-addr frame will
 658                                  * confuse the bridge into thinking the sending
 659                                  * sta is located at the end of WDS link.
 660                                  */
 661                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 662                                     "3-address data", "%s", "DWDS enabled");
 663                                 vap->iv_stats.is_rx_mcastecho++;
 664                                 goto out;
 665                         }
 666                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 667                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 668                                 IEEE80211_DISCARD(vap,
 669                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 670                                     "%s", "DWDS not enabled");
 671                                 vap->iv_stats.is_rx_wrongdir++;
 672                                 goto out;
 673                         }
 674                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 675                             isdstods_mcastecho(vap, wh)) {
 676                                 /*
 677                                  * In IEEE802.11 network, multicast
 678                                  * packets sent from "me" are broadcast
 679                                  * from the AP; silently discard for
 680                                  * SIMPLEX interface.
 681                                  */
 682                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 683                                     "4-address data", "%s", "multicast echo");
 684                                 vap->iv_stats.is_rx_mcastecho++;
 685                                 goto out;
 686                         }
 687                 } else {
 688                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 689                             "data", "incorrect dir 0x%x", dir);
 690                         vap->iv_stats.is_rx_wrongdir++;
 691                         goto out;
 692                 }
 693
 694                 /*
 695                  * Handle privacy requirements.  Note that we
 696                  * must not be preempted from here until after
 697                  * we (potentially) call ieee80211_crypto_demic;
 698                  * otherwise we may violate assumptions in the
 699                  * crypto cipher modules used to do delayed update
 700                  * of replay sequence numbers.
 701                  */
 702                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 703                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 704                                 /*
 705                                  * Discard encrypted frames when privacy is off.
 706                                  */
 707                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 708                                     wh, "WEP", "%s", "PRIVACY off");
 709                                 vap->iv_stats.is_rx_noprivacy++;
 710                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 711                                 goto out;
 712                         }
 713                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 714                         if (key == NULL) {
 715                                 /* NB: stats+msgs handled in crypto_decap */
 716                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 717                                 goto out;
 718                         }
 719                         wh = mtod(m, struct ieee80211_frame *);
 720                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 721                 } else {
 722                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 723                         key = NULL;
 724                 }
 725
 726                 /*
 727                  * Save QoS bits for use below--before we strip the header.
 728                  */
 729                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 730                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 731                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 732                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 733                 } else
 734                         qos = 0;
 735
 736                 /*
 737                  * Next up, any fragmentation.
 738                  */
 739                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 740                         m = ieee80211_defrag(ni, m, hdrspace);
 741                         if (m == NULL) {
 742                                 /* Fragment dropped or frame not complete yet */
 743                                 goto out;
 744                         }
 745                 }
 746                 wh = NULL;              /* no longer valid, catch any uses */
 747
 748                 /*
 749                  * Next strip any MSDU crypto bits.
 750                  */
 751                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 752                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 753                             ni->ni_macaddr, "data", "%s", "demic error");
 754                         vap->iv_stats.is_rx_demicfail++;
 755                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 756                         goto out;
 757                 }
 758
 759                 /* copy to listener after decrypt */
 760                 if (ieee80211_radiotap_active_vap(vap))
 761                         ieee80211_radiotap_rx(vap, m);
 762                 need_tap = 0;
 763
 764                 /*
 765                  * Finally, strip the 802.11 header.
 766                  */
 767                 m = ieee80211_decap(vap, m, hdrspace);
 768                 if (m == NULL) {
 769                         /* XXX mask bit to check for both */
 770                         /* don't count Null data frames as errors */
 771                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 772                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 773                                 goto out;
 774                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 775                             ni->ni_macaddr, "data", "%s", "decap error");
 776                         vap->iv_stats.is_rx_decap++;
 777                         IEEE80211_NODE_STAT(ni, rx_decap);
 778                         goto err;
 779                 }
 780                 eh = mtod(m, struct ether_header *);
 781                 if (!ieee80211_node_is_authorized(ni)) {
 782                         /*
 783                          * Deny any non-PAE frames received prior to
 784                          * authorization.  For open/shared-key
 785                          * authentication the port is mark authorized
 786                          * after authentication completes.  For 802.1x
 787                          * the port is not marked authorized by the
 788                          * authenticator until the handshake has completed.
 789                          */
 790                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 791                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 792                                     eh->ether_shost, "data",
 793                                     "unauthorized port: ether type 0x%x len %u",
 794                                     eh->ether_type, m->m_pkthdr.len);
 795                                 vap->iv_stats.is_rx_unauth++;
 796                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 797                                 goto err;
 798                         }
 799                 } else {
 800                         /*
 801                          * When denying unencrypted frames, discard
 802                          * any non-PAE frames received without encryption.
 803                          */
 804                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 805                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 806                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 807                                 /*
 808                                  * Drop unencrypted frames.
 809                                  */
 810                                 vap->iv_stats.is_rx_unencrypted++;
 811                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 812                                 goto out;
 813                         }
 814                 }
 815                 /* XXX require HT? */
 816                 if (qos & IEEE80211_QOS_AMSDU) {
 817                         m = ieee80211_decap_amsdu(ni, m);
 818                         if (m == NULL)
 819                                 return IEEE80211_FC0_TYPE_DATA;
 820                 } else {
 821 #ifdef IEEE80211_SUPPORT_SUPERG
 822                         m = ieee80211_decap_fastframe(vap, ni, m);
 823                         if (m == NULL)
 824                                 return IEEE80211_FC0_TYPE_DATA;
 825 #endif
 826                 }
 827                 ieee80211_deliver_data(vap, ni, m);
 828                 return IEEE80211_FC0_TYPE_DATA;
 829
 830         case IEEE80211_FC0_TYPE_MGT:
 831                 vap->iv_stats.is_rx_mgmt++;
 832                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 833                 if (dir != IEEE80211_FC1_DIR_NODS) {
 834                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 835                             wh, "data", "incorrect dir 0x%x", dir);
 836                         vap->iv_stats.is_rx_wrongdir++;
 837                         goto err;
 838                 }
 839                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 840                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 841                             ni->ni_macaddr, "mgt", "too short: len %u",
 842                             m->m_pkthdr.len);
 843                         vap->iv_stats.is_rx_tooshort++;
 844                         goto out;
 845                 }
 846 #ifdef IEEE80211_DEBUG
 847                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 848                     ieee80211_msg_dumppkts(vap)) {
 849                         if_printf(ifp, "received %s from %s rssi %d\n",
 850                             ieee80211_mgt_subtype_name[subtype >>
 851                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 852                             ether_sprintf(wh->i_addr2), rssi);
 853                 }
 854 #endif
 855                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 856                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 857                                 /*
 858                                  * Only shared key auth frames with a challenge
 859                                  * should be encrypted, discard all others.
 860                                  */
 861                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 862                                     wh, ieee80211_mgt_subtype_name[subtype >>
 863                                         IEEE80211_FC0_SUBTYPE_SHIFT],
 864                                     "%s", "WEP set but not permitted");
 865                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 866                                 goto out;
 867                         }
 868                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 869                                 /*
 870                                  * Discard encrypted frames when privacy is off.
 871                                  */
 872                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 873                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 874                                 vap->iv_stats.is_rx_noprivacy++;
 875                                 goto out;
 876                         }
 877                         hdrspace = ieee80211_hdrspace(ic, wh);
 878                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 879                         if (key == NULL) {
 880                                 /* NB: stats+msgs handled in crypto_decap */
 881                                 goto out;
 882                         }
 883                         wh = mtod(m, struct ieee80211_frame *);
 884                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 885                 }
 886                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 887                 goto out;
 888
 889         case IEEE80211_FC0_TYPE_CTL:
 890                 vap->iv_stats.is_rx_ctl++;
 891                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 892                 vap->iv_recv_ctl(ni, m, subtype);
 893                 goto out;
 894
 895         default:
 896                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 897                     wh, NULL, "bad frame type 0x%x", type);
 898                 /* should not come here */
 899                 break;
 900         }
 901 err:
 902         ifp->if_ierrors++;
 903 out:
 904         if (m != NULL) {
 905                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 906                         ieee80211_radiotap_rx(vap, m);
 907                 m_freem(m);
 908         }
 909         return type;
 910 }
 911
 912 static void
 913 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 914     int rssi, int nf, uint16_t seq, uint16_t status)
 915 {
 916         struct ieee80211vap *vap = ni->ni_vap;
 917
 918         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 919                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 920                     ni->ni_macaddr, "open auth",
 921                     "bad sta auth mode %u", ni->ni_authmode);
 922                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 923                 return;
 924         }
 925         if (vap->iv_state != IEEE80211_S_AUTH ||
 926             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
 927                 vap->iv_stats.is_rx_bad_auth++;
 928                 return;
 929         }
 930         if (status != 0) {
 931                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 932                     ni, "open auth failed (reason %d)", status);
 933                 vap->iv_stats.is_rx_auth_fail++;
 934                 vap->iv_stats.is_rx_authfail_code = status;
 935                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 936                     IEEE80211_SCAN_FAIL_STATUS);
 937         } else
 938                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 939 }
 940
 941 static void
 942 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 943     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 944     uint16_t seq, uint16_t status)
 945 {
 946         struct ieee80211vap *vap = ni->ni_vap;
 947         uint8_t *challenge;
 948         int estatus;
 949
 950         /*
 951          * NB: this can happen as we allow pre-shared key
 952          * authentication to be enabled w/o wep being turned
 953          * on so that configuration of these can be done
 954          * in any order.  It may be better to enforce the
 955          * ordering in which case this check would just be
 956          * for sanity/consistency.
 957          */
 958         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 959                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 960                     ni->ni_macaddr, "shared key auth",
 961                     "%s", " PRIVACY is disabled");
 962                 estatus = IEEE80211_STATUS_ALG;
 963                 goto bad;
 964         }
 965         /*
 966          * Pre-shared key authentication is evil; accept
 967          * it only if explicitly configured (it is supported
 968          * mainly for compatibility with clients like OS X).
 969          */
 970         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
 971             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
 972                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 973                     ni->ni_macaddr, "shared key auth",
 974                     "bad sta auth mode %u", ni->ni_authmode);
 975                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
 976                 estatus = IEEE80211_STATUS_ALG;
 977                 goto bad;
 978         }
 979
 980         challenge = NULL;
 981         if (frm + 1 < efrm) {
 982                 if ((frm[1] + 2) > (efrm - frm)) {
 983                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 984                             ni->ni_macaddr, "shared key auth",
 985                             "ie %d/%d too long",
 986                             frm[0], (frm[1] + 2) - (efrm - frm));
 987                         vap->iv_stats.is_rx_bad_auth++;
 988                         estatus = IEEE80211_STATUS_CHALLENGE;
 989                         goto bad;
 990                 }
 991                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
 992                         challenge = frm;
 993                 frm += frm[1] + 2;
 994         }
 995         switch (seq) {
 996         case IEEE80211_AUTH_SHARED_CHALLENGE:
 997         case IEEE80211_AUTH_SHARED_RESPONSE:
 998                 if (challenge == NULL) {
 999                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1000                             ni->ni_macaddr, "shared key auth",
1001                             "%s", "no challenge");
1002                         vap->iv_stats.is_rx_bad_auth++;
1003                         estatus = IEEE80211_STATUS_CHALLENGE;
1004                         goto bad;
1005                 }
1006                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1007                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1008                             ni->ni_macaddr, "shared key auth",
1009                             "bad challenge len %d", challenge[1]);
1010                         vap->iv_stats.is_rx_bad_auth++;
1011                         estatus = IEEE80211_STATUS_CHALLENGE;
1012                         goto bad;
1013                 }
1014         default:
1015                 break;
1016         }
1017         if (vap->iv_state != IEEE80211_S_AUTH)
1018                 return;
1019         switch (seq) {
1020         case IEEE80211_AUTH_SHARED_PASS:
1021                 if (ni->ni_challenge != NULL) {
1022                         free(ni->ni_challenge, M_80211_NODE);
1023                         ni->ni_challenge = NULL;
1024                 }
1025                 if (status != 0) {
1026                         IEEE80211_NOTE_FRAME(vap,
1027                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1028                             "shared key auth failed (reason %d)", status);
1029                         vap->iv_stats.is_rx_auth_fail++;
1030                         vap->iv_stats.is_rx_authfail_code = status;
1031                         return;
1032                 }
1033                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1034                 break;
1035         case IEEE80211_AUTH_SHARED_CHALLENGE:
1036                 if (!ieee80211_alloc_challenge(ni))
1037                         return;
1038                 /* XXX could optimize by passing recvd challenge */
1039                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1040                 IEEE80211_SEND_MGMT(ni,
1041                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1042                 break;
1043         default:
1044                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1045                     wh, "shared key auth", "bad seq %d", seq);
1046                 vap->iv_stats.is_rx_bad_auth++;
1047                 return;
1048         }
1049         return;
1050 bad:
1051         /*
1052          * Kick the state machine.  This short-circuits
1053          * using the mgt frame timeout to trigger the
1054          * state transition.
1055          */
1056         if (vap->iv_state == IEEE80211_S_AUTH)
1057                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1058                     IEEE80211_SCAN_FAIL_STATUS);
1059 }
1060
1061 static int
1062 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1063         const struct ieee80211_frame *wh)
1064 {
1065 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1066         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1067         u_int len = frm[1], qosinfo;
1068         int i;
1069
1070         if (len < sizeof(struct ieee80211_wme_param)-2) {
1071                 IEEE80211_DISCARD_IE(vap,
1072                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1073                     wh, "WME", "too short, len %u", len);
1074                 return -1;
1075         }
1076         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1077         qosinfo &= WME_QOSINFO_COUNT;
1078         /* XXX do proper check for wraparound */
1079         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1080                 return 0;
1081         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1082         for (i = 0; i < WME_NUM_AC; i++) {
1083                 struct wmeParams *wmep =
1084                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1085                 /* NB: ACI not used */
1086                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1087                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1088                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1089                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1090                 wmep->wmep_txopLimit = LE_READ_2(frm+2);
1091                 frm += 4;
1092         }
1093         wme->wme_wmeChanParams.cap_info = qosinfo;
1094         return 1;
1095 #undef MS
1096 }
1097
1098 /*
1099  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1100  * is the first CSA then initiate the switch.  Otherwise we
1101  * track state and trigger completion and/or cancel of the switch.
1102  * XXX should be public for IBSS use
1103  */
1104 static void
1105 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1106         const struct ieee80211_frame *wh)
1107 {
1108         struct ieee80211com *ic = vap->iv_ic;
1109         const struct ieee80211_csa_ie *csa =
1110             (const struct ieee80211_csa_ie *) frm;
1111
1112         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1113             ("state %s", ieee80211_state_name[vap->iv_state]));
1114
1115         if (csa->csa_mode > 1) {
1116                 IEEE80211_DISCARD_IE(vap,
1117                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1118                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1119                 return;
1120         }
1121         IEEE80211_LOCK(ic);
1122         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1123                 /*
1124                  * Convert the channel number to a channel reference.  We
1125                  * try first to preserve turbo attribute of the current
1126                  * channel then fallback.  Note this will not work if the
1127                  * CSA specifies a channel that requires a band switch (e.g.
1128                  * 11a => 11g).  This is intentional as 11h is defined only
1129                  * for 5GHz/11a and because the switch does not involve a
1130                  * reassociation, protocol state (capabilities, negotated
1131                  * rates, etc) may/will be wrong.
1132                  */
1133                 struct ieee80211_channel *c =
1134                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1135                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1136                 if (c == NULL) {
1137                         c = ieee80211_find_channel_byieee(ic,
1138                             csa->csa_newchan,
1139                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1140                         if (c == NULL) {
1141                                 IEEE80211_DISCARD_IE(vap,
1142                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1143                                     wh, "CSA", "invalid channel %u",
1144                                     csa->csa_newchan);
1145                                 goto done;
1146                         }
1147                 }
1148 #if IEEE80211_CSA_COUNT_MIN > 0
1149                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1150                         /*
1151                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1152                          * reduce the risk of being redirected by a fabricated
1153                          * CSA.  If a valid CSA is dropped we'll still get a
1154                          * beacon miss when the AP leaves the channel so we'll
1155                          * eventually follow to the new channel.
1156                          *
1157                          * NOTE: this violates the 11h spec that states that
1158                          * count may be any value and if 0 then a switch
1159                          * should happen asap.
1160                          */
1161                         IEEE80211_DISCARD_IE(vap,
1162                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1163                             wh, "CSA", "count %u too small, must be >= %u",
1164                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1165                         goto done;
1166                 }
1167 #endif
1168                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1169         } else {
1170                 /*
1171                  * Validate this ie against the initial CSA.  We require
1172                  * mode and channel not change and the count must be
1173                  * monotonically decreasing.  This may be pointless and
1174                  * canceling the switch as a result may be too paranoid but
1175                  * in the worst case if we drop out of CSA because of this
1176                  * and the AP does move then we'll just end up taking a
1177                  * beacon miss and scan to find the AP.
1178                  *
1179                  * XXX may want <= on count as we also process ProbeResp
1180                  * frames and those may come in w/ the same count as the
1181                  * previous beacon; but doing so leaves us open to a stuck
1182                  * count until we add a dead-man timer
1183                  */
1184                 if (!(csa->csa_count < ic->ic_csa_count &&
1185                       csa->csa_mode == ic->ic_csa_mode &&
1186                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1187                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1188                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1189                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1190                             ic->ic_csa_newchan, ic->ic_csa_count,
1191                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1192                         ieee80211_csa_cancelswitch(ic);
1193                 } else {
1194                         if (csa->csa_count <= 1)
1195                                 ieee80211_csa_completeswitch(ic);
1196                         else
1197                                 ic->ic_csa_count = csa->csa_count;
1198                 }
1199         }
1200 done:
1201         IEEE80211_UNLOCK(ic);
1202 }
1203
1204 /*
1205  * Return non-zero if a background scan may be continued:
1206  * o bg scan is active
1207  * o no channel switch is pending
1208  * o there has not been any traffic recently
1209  *
1210  * Note we do not check if there is an administrative enable;
1211  * this is only done to start the scan.  We assume that any
1212  * change in state will be accompanied by a request to cancel
1213  * active scans which will otherwise cause this test to fail.
1214  */
1215 static __inline int
1216 contbgscan(struct ieee80211vap *vap)
1217 {
1218         struct ieee80211com *ic = vap->iv_ic;
1219
1220         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1221             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1222             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1223             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1224 }
1225
1226 /*
1227  * Return non-zero if a backgrond scan may be started:
1228  * o bg scanning is administratively enabled
1229  * o no channel switch is pending
1230  * o we are not boosted on a dynamic turbo channel
1231  * o there has not been a scan recently
1232  * o there has not been any traffic recently
1233  */
1234 static __inline int
1235 startbgscan(struct ieee80211vap *vap)
1236 {
1237         struct ieee80211com *ic = vap->iv_ic;
1238
1239         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1240             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1241 #ifdef IEEE80211_SUPPORT_SUPERG
1242             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1243 #endif
1244             time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1245             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1246 }
1247
1248 static void
1249 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1250         int subtype, int rssi, int nf)
1251 {
1252 #define ISPROBE(_st)    ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1253 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1254         struct ieee80211vap *vap = ni->ni_vap;
1255         struct ieee80211com *ic = ni->ni_ic;
1256         struct ieee80211_frame *wh;
1257         uint8_t *frm, *efrm;
1258         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1259         uint8_t rate;
1260
1261         wh = mtod(m0, struct ieee80211_frame *);
1262         frm = (uint8_t *)&wh[1];
1263         efrm = mtod(m0, uint8_t *) + m0->m_len;
1264         switch (subtype) {
1265         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1266         case IEEE80211_FC0_SUBTYPE_BEACON: {
1267                 struct ieee80211_scanparams scan;
1268                 /*
1269                  * We process beacon/probe response frames:
1270                  *    o when scanning, or
1271                  *    o station mode when associated (to collect state
1272                  *      updates such as 802.11g slot time)
1273                  * Frames otherwise received are discarded.
1274                  */
1275                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1276                         vap->iv_stats.is_rx_mgtdiscard++;
1277                         return;
1278                 }
1279                 /* XXX probe response in sta mode when !scanning? */
1280                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
1281                         return;
1282                 /*
1283                  * Count frame now that we know it's to be processed.
1284                  */
1285                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1286                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1287                         IEEE80211_NODE_STAT(ni, rx_beacons);
1288                 } else
1289                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1290                 /*
1291                  * When operating in station mode, check for state updates.
1292                  * Be careful to ignore beacons received while doing a
1293                  * background scan.  We consider only 11g/WMM stuff right now.
1294                  */
1295                 if (ni->ni_associd != 0 &&
1296                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1297                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1298                         /* record tsf of last beacon */
1299                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1300                                 sizeof(ni->ni_tstamp));
1301                         /* count beacon frame for s/w bmiss handling */
1302                         vap->iv_swbmiss_count++;
1303                         vap->iv_bmiss_count = 0;
1304                         if (ni->ni_erp != scan.erp) {
1305                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1306                                     wh->i_addr2,
1307                                     "erp change: was 0x%x, now 0x%x",
1308                                     ni->ni_erp, scan.erp);
1309                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1310                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1311                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1312                                 else
1313                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1314                                 ni->ni_erp = scan.erp;
1315                                 /* XXX statistic */
1316                                 /* XXX driver notification */
1317                         }
1318                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1319                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1320                                     wh->i_addr2,
1321                                     "capabilities change: was 0x%x, now 0x%x",
1322                                     ni->ni_capinfo, scan.capinfo);
1323                                 /*
1324                                  * NB: we assume short preamble doesn't
1325                                  *     change dynamically
1326                                  */
1327                                 ieee80211_set_shortslottime(ic,
1328                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1329                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1330                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1331                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1332                                 /* XXX statistic */
1333                         }
1334                         if (scan.wme != NULL &&
1335                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1336                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1337                                 ieee80211_wme_updateparams(vap);
1338 #ifdef IEEE80211_SUPPORT_SUPERG
1339                         if (scan.ath != NULL)
1340                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1341 #endif
1342                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1343                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1344                                 ieee80211_ht_updateparams(ni,
1345                                     scan.htcap, scan.htinfo);
1346                                 /* XXX state changes? */
1347                         }
1348                         if (scan.tim != NULL) {
1349                                 struct ieee80211_tim_ie *tim =
1350                                     (struct ieee80211_tim_ie *) scan.tim;
1351 #if 0
1352                                 int aid = IEEE80211_AID(ni->ni_associd);
1353                                 int ix = aid / NBBY;
1354                                 int min = tim->tim_bitctl &~ 1;
1355                                 int max = tim->tim_len + min - 4;
1356                                 if ((tim->tim_bitctl&1) ||
1357                                     (min <= ix && ix <= max &&
1358                                      isset(tim->tim_bitmap - min, aid))) {
1359                                         /*
1360                                          * XXX Do not let bg scan kick off
1361                                          * we are expecting data.
1362                                          */
1363                                         ic->ic_lastdata = ticks;
1364                                         ieee80211_sta_pwrsave(vap, 0);
1365                                 }
1366 #endif
1367                                 ni->ni_dtim_count = tim->tim_count;
1368                                 ni->ni_dtim_period = tim->tim_period;
1369                         }
1370                         if (scan.csa != NULL &&
1371                             (vap->iv_flags & IEEE80211_F_DOTH))
1372                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1373                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1374                                 /*
1375                                  * No CSA ie or 11h disabled, but a channel
1376                                  * switch is pending; drop out so we aren't
1377                                  * stuck in CSA state.  If the AP really is
1378                                  * moving we'll get a beacon miss and scan.
1379                                  */
1380                                 IEEE80211_LOCK(ic);
1381                                 ieee80211_csa_cancelswitch(ic);
1382                                 IEEE80211_UNLOCK(ic);
1383                         }
1384                         /*
1385                          * If scanning, pass the info to the scan module.
1386                          * Otherwise, check if it's the right time to do
1387                          * a background scan.  Background scanning must
1388                          * be enabled and we must not be operating in the
1389                          * turbo phase of dynamic turbo mode.  Then,
1390                          * it's been a while since the last background
1391                          * scan and if no data frames have come through
1392                          * recently, kick off a scan.  Note that this
1393                          * is the mechanism by which a background scan
1394                          * is started _and_ continued each time we
1395                          * return on-channel to receive a beacon from
1396                          * our ap.
1397                          */
1398                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1399                                 ieee80211_add_scan(vap, &scan, wh,
1400                                         subtype, rssi, nf);
1401                         } else if (contbgscan(vap)) {
1402                                 ieee80211_bg_scan(vap, 0);
1403                         } else if (startbgscan(vap)) {
1404                                 vap->iv_stats.is_scan_bg++;
1405 #if 0
1406                                 /* wakeup if we are sleeing */
1407                                 ieee80211_set_pwrsave(vap, 0);
1408 #endif
1409                                 ieee80211_bg_scan(vap, 0);
1410                         }
1411                         return;
1412                 }
1413                 /*
1414                  * If scanning, just pass information to the scan module.
1415                  */
1416                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1417                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1418                                 /*
1419                                  * Actively scanning a channel marked passive;
1420                                  * send a probe request now that we know there
1421                                  * is 802.11 traffic present.
1422                                  *
1423                                  * XXX check if the beacon we recv'd gives
1424                                  * us what we need and suppress the probe req
1425                                  */
1426                                 ieee80211_probe_curchan(vap, 1);
1427                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1428                         }
1429                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1430                         return;
1431                 }
1432                 break;
1433         }
1434
1435         case IEEE80211_FC0_SUBTYPE_AUTH: {
1436                 uint16_t algo, seq, status;
1437                 /*
1438                  * auth frame format
1439                  *      [2] algorithm
1440                  *      [2] sequence
1441                  *      [2] status
1442                  *      [tlv*] challenge
1443                  */
1444                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1445                 algo   = le16toh(*(uint16_t *)frm);
1446                 seq    = le16toh(*(uint16_t *)(frm + 2));
1447                 status = le16toh(*(uint16_t *)(frm + 4));
1448                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1449                     "recv auth frame with algorithm %d seq %d", algo, seq);
1450
1451                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1452                         IEEE80211_DISCARD(vap,
1453                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1454                             wh, "auth", "%s", "TKIP countermeasures enabled");
1455                         vap->iv_stats.is_rx_auth_countermeasures++;
1456                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1457                                 ieee80211_send_error(ni, wh->i_addr2,
1458                                         IEEE80211_FC0_SUBTYPE_AUTH,
1459                                         IEEE80211_REASON_MIC_FAILURE);
1460                         }
1461                         return;
1462                 }
1463                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1464                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1465                             seq, status);
1466                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1467                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1468                 else {
1469                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1470                             wh, "auth", "unsupported alg %d", algo);
1471                         vap->iv_stats.is_rx_auth_unsupported++;
1472                         return;
1473                 }
1474                 break;
1475         }
1476
1477         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1478         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1479                 uint16_t capinfo, associd;
1480                 uint16_t status;
1481
1482                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1483                         vap->iv_stats.is_rx_mgtdiscard++;
1484                         return;
1485                 }
1486
1487                 /*
1488                  * asresp frame format
1489                  *      [2] capability information
1490                  *      [2] status
1491                  *      [2] association ID
1492                  *      [tlv] supported rates
1493                  *      [tlv] extended supported rates
1494                  *      [tlv] WME
1495                  *      [tlv] HT capabilities
1496                  *      [tlv] HT info
1497                  */
1498                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1499                 ni = vap->iv_bss;
1500                 capinfo = le16toh(*(uint16_t *)frm);
1501                 frm += 2;
1502                 status = le16toh(*(uint16_t *)frm);
1503                 frm += 2;
1504                 if (status != 0) {
1505                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1506                             wh->i_addr2, "%sassoc failed (reason %d)",
1507                             ISREASSOC(subtype) ?  "re" : "", status);
1508                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1509                         return;
1510                 }
1511                 associd = le16toh(*(uint16_t *)frm);
1512                 frm += 2;
1513
1514                 rates = xrates = wme = htcap = htinfo = NULL;
1515                 while (efrm - frm > 1) {
1516                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1517                         switch (*frm) {
1518                         case IEEE80211_ELEMID_RATES:
1519                                 rates = frm;
1520                                 break;
1521                         case IEEE80211_ELEMID_XRATES:
1522                                 xrates = frm;
1523                                 break;
1524                         case IEEE80211_ELEMID_HTCAP:
1525                                 htcap = frm;
1526                                 break;
1527                         case IEEE80211_ELEMID_HTINFO:
1528                                 htinfo = frm;
1529                                 break;
1530                         case IEEE80211_ELEMID_VENDOR:
1531                                 if (iswmeoui(frm))
1532                                         wme = frm;
1533                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1534                                         /*
1535                                          * Accept pre-draft HT ie's if the
1536                                          * standard ones have not been seen.
1537                                          */
1538                                         if (ishtcapoui(frm)) {
1539                                                 if (htcap == NULL)
1540                                                         htcap = frm;
1541                                         } else if (ishtinfooui(frm)) {
1542                                                 if (htinfo == NULL)
1543                                                         htinfo = frm;
1544                                         }
1545                                 }
1546                                 /* XXX Atheros OUI support */
1547                                 break;
1548                         }
1549                         frm += frm[1] + 2;
1550                 }
1551
1552                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1553                 if (xrates != NULL)
1554                         IEEE80211_VERIFY_ELEMENT(xrates,
1555                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1556                 rate = ieee80211_setup_rates(ni, rates, xrates,
1557                                 IEEE80211_F_JOIN |
1558                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1559                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1560                 if (rate & IEEE80211_RATE_BASIC) {
1561                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1562                             wh->i_addr2,
1563                             "%sassoc failed (rate set mismatch)",
1564                             ISREASSOC(subtype) ?  "re" : "");
1565                         vap->iv_stats.is_rx_assoc_norate++;
1566                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1567                             IEEE80211_SCAN_FAIL_STATUS);
1568                         return;
1569                 }
1570
1571                 ni->ni_capinfo = capinfo;
1572                 ni->ni_associd = associd;
1573                 if (ni->ni_jointime == 0)
1574                         ni->ni_jointime = time_uptime;
1575                 if (wme != NULL &&
1576                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1577                         ni->ni_flags |= IEEE80211_NODE_QOS;
1578                         ieee80211_wme_updateparams(vap);
1579                 } else
1580                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1581                 /*
1582                  * Setup HT state according to the negotiation.
1583                  *
1584                  * NB: shouldn't need to check if HT use is enabled but some
1585                  *     ap's send back HT ie's even when we don't indicate we
1586                  *     are HT capable in our AssocReq.
1587                  */
1588                 if (htcap != NULL && htinfo != NULL &&
1589                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1590                         ieee80211_ht_node_init(ni);
1591                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1592                         ieee80211_setup_htrates(ni, htcap,
1593                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1594                         ieee80211_setup_basic_htrates(ni, htinfo);
1595                         ieee80211_node_setuptxparms(ni);
1596                         ieee80211_ratectl_node_init(ni);
1597                 } else {
1598 #ifdef IEEE80211_SUPPORT_SUPERG
1599                         if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1600                                 ieee80211_ff_node_init(ni);
1601 #endif
1602                 }
1603                 /*
1604                  * Configure state now that we are associated.
1605                  *
1606                  * XXX may need different/additional driver callbacks?
1607                  */
1608                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1609                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1610                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1611                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1612                 } else {
1613                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1614                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1615                 }
1616                 ieee80211_set_shortslottime(ic,
1617                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1618                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1619                 /*
1620                  * Honor ERP protection.
1621                  *
1622                  * NB: ni_erp should zero for non-11g operation.
1623                  */
1624                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1625                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1626                         ic->ic_flags |= IEEE80211_F_USEPROT;
1627                 else
1628                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1629                 IEEE80211_NOTE_MAC(vap,
1630                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1631                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1632                     ISREASSOC(subtype) ? "re" : "",
1633                     IEEE80211_NODE_AID(ni),
1634                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1635                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1636                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1637                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1638                     ni->ni_flags & IEEE80211_NODE_HT ?
1639                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1640                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1641                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1642                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1643                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1644                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1645                         ", fast-frames" : "",
1646                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1647                         ", turbo" : ""
1648                 );
1649                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1650                 break;
1651         }
1652
1653         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1654                 uint16_t reason;
1655
1656                 if (vap->iv_state == IEEE80211_S_SCAN) {
1657                         vap->iv_stats.is_rx_mgtdiscard++;
1658                         return;
1659                 }
1660                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1661                         /* NB: can happen when in promiscuous mode */
1662                         vap->iv_stats.is_rx_mgtdiscard++;
1663                         break;
1664                 }
1665
1666                 /*
1667                  * deauth frame format
1668                  *      [2] reason
1669                  */
1670                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1671                 reason = le16toh(*(uint16_t *)frm);
1672
1673                 vap->iv_stats.is_rx_deauth++;
1674                 vap->iv_stats.is_rx_deauth_code = reason;
1675                 IEEE80211_NODE_STAT(ni, rx_deauth);
1676
1677                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1678                     "recv deauthenticate (reason %d)", reason);
1679                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1680                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1681                 break;
1682         }
1683
1684         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1685                 uint16_t reason;
1686
1687                 if (vap->iv_state != IEEE80211_S_RUN &&
1688                     vap->iv_state != IEEE80211_S_ASSOC &&
1689                     vap->iv_state != IEEE80211_S_AUTH) {
1690                         vap->iv_stats.is_rx_mgtdiscard++;
1691                         return;
1692                 }
1693                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1694                         /* NB: can happen when in promiscuous mode */
1695                         vap->iv_stats.is_rx_mgtdiscard++;
1696                         break;
1697                 }
1698
1699                 /*
1700                  * disassoc frame format
1701                  *      [2] reason
1702                  */
1703                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1704                 reason = le16toh(*(uint16_t *)frm);
1705
1706                 vap->iv_stats.is_rx_disassoc++;
1707                 vap->iv_stats.is_rx_disassoc_code = reason;
1708                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1709
1710                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1711                     "recv disassociate (reason %d)", reason);
1712                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1713                 break;
1714         }
1715
1716         case IEEE80211_FC0_SUBTYPE_ACTION:
1717         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1718                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1719                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1720                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1721                             wh, NULL, "%s", "not for us");
1722                         vap->iv_stats.is_rx_mgtdiscard++;
1723                 } else if (vap->iv_state != IEEE80211_S_RUN) {
1724                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1725                             wh, NULL, "wrong state %s",
1726                             ieee80211_state_name[vap->iv_state]);
1727                         vap->iv_stats.is_rx_mgtdiscard++;
1728                 } else {
1729                         if (ieee80211_parse_action(ni, m0) == 0)
1730                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1731                 }
1732                 break;
1733
1734         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1735         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1736         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1737         case IEEE80211_FC0_SUBTYPE_ATIM:
1738                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1739                     wh, NULL, "%s", "not handled");
1740                 vap->iv_stats.is_rx_mgtdiscard++;
1741                 break;
1742
1743         default:
1744                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1745                     wh, "mgt", "subtype 0x%x not handled", subtype);
1746                 vap->iv_stats.is_rx_badsubtype++;
1747                 break;
1748         }
1749 #undef ISREASSOC
1750 #undef ISPROBE
1751 }
1752
1753 static void
1754 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1755 {
1756         switch (subtype) {
1757         case IEEE80211_FC0_SUBTYPE_BAR:
1758                 ieee80211_recv_bar(ni, m);
1759                 break;
1760         }
1761 }