sys/net80211/ieee80211_sta.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifdef __FreeBSD__
  30 __FBSDID("$FreeBSD$");
  31 #endif
  32
  33 /*
  34  * IEEE 802.11 Station mode support.
  35  */
  36 #include "opt_inet.h"
  37 #include "opt_wlan.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/malloc.h>
  43 #include <sys/kernel.h>
  44
  45 #include <sys/socket.h>
  46 #include <sys/sockio.h>
  47 #include <sys/endian.h>
  48 #include <sys/errno.h>
  49 #include <sys/proc.h>
  50 #include <sys/sysctl.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_media.h>
  54 #include <net/if_llc.h>
  55 #include <net/if_dl.h>
  56 #include <net/if_var.h>
  57 #include <net/ethernet.h>
  58
  59 #include <net/bpf.h>
  60
  61 #include <net80211/ieee80211_var.h>
  62 #include <net80211/ieee80211_sta.h>
  63 #include <net80211/ieee80211_input.h>
  64 #ifdef IEEE80211_SUPPORT_SUPERG
  65 #include <net80211/ieee80211_superg.h>
  66 #endif
  67 #include <net80211/ieee80211_ratectl.h>
  68 #include <net80211/ieee80211_sta.h>
  69 #include <net80211/ieee80211_vht.h>
  70
  71 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  72
  73 static  void sta_vattach(struct ieee80211vap *);
  74 static  void sta_beacon_miss(struct ieee80211vap *);
  75 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  76 static  int sta_input(struct ieee80211_node *, struct mbuf *,
  77             const struct ieee80211_rx_stats *, int, int);
  78 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  79             int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
  80 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  81
  82 void
  83 ieee80211_sta_attach(struct ieee80211com *ic)
  84 {
  85         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  86 }
  87
  88 void
  89 ieee80211_sta_detach(struct ieee80211com *ic)
  90 {
  91 }
  92
  93 static void
  94 sta_vdetach(struct ieee80211vap *vap)
  95 {
  96 }
  97
  98 static void
  99 sta_vattach(struct ieee80211vap *vap)
 100 {
 101         vap->iv_newstate = sta_newstate;
 102         vap->iv_input = sta_input;
 103         vap->iv_recv_mgmt = sta_recv_mgmt;
 104         vap->iv_recv_ctl = sta_recv_ctl;
 105         vap->iv_opdetach = sta_vdetach;
 106         vap->iv_bmiss = sta_beacon_miss;
 107 }
 108
 109 /*
 110  * Handle a beacon miss event.  The common code filters out
 111  * spurious events that can happen when scanning and/or before
 112  * reaching RUN state.
 113  */
 114 static void
 115 sta_beacon_miss(struct ieee80211vap *vap)
 116 {
 117         struct ieee80211com *ic = vap->iv_ic;
 118
 119         IEEE80211_LOCK_ASSERT(ic);
 120
 121         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 122         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 123             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 124
 125         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 126             "beacon miss, mode %s state %s\n",
 127             ieee80211_opmode_name[vap->iv_opmode],
 128             ieee80211_state_name[vap->iv_state]);
 129
 130         if (vap->iv_state == IEEE80211_S_CSA) {
 131                 /*
 132                  * A Channel Switch is pending; assume we missed the
 133                  * beacon that would've completed the process and just
 134                  * force the switch.  If we made a mistake we'll not
 135                  * find the AP on the new channel and fall back to a
 136                  * normal scan.
 137                  */
 138                 ieee80211_csa_completeswitch(ic);
 139                 return;
 140         }
 141         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 142                 /*
 143                  * Send a directed probe req before falling back to a
 144                  * scan; if we receive a response ic_bmiss_count will
 145                  * be reset.  Some cards mistakenly report beacon miss
 146                  * so this avoids the expensive scan if the ap is
 147                  * still there.
 148                  */
 149                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 150                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 151                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 152                 return;
 153         }
 154
 155         callout_stop(&vap->iv_swbmiss);
 156         vap->iv_bmiss_count = 0;
 157         vap->iv_stats.is_beacon_miss++;
 158         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 159 #ifdef IEEE80211_SUPPORT_SUPERG
 160
 161                 /*
 162                  * If we receive a beacon miss interrupt when using
 163                  * dynamic turbo, attempt to switch modes before
 164                  * reassociating.
 165                  */
 166                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 167                         ieee80211_dturbo_switch(vap,
 168                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 169 #endif
 170                 /*
 171                  * Try to reassociate before scanning for a new ap.
 172                  */
 173                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 174         } else {
 175                 /*
 176                  * Somebody else is controlling state changes (e.g.
 177                  * a user-mode app) don't do anything that would
 178                  * confuse them; just drop into scan mode so they'll
 179                  * notified of the state change and given control.
 180                  */
 181                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 182         }
 183 }
 184
 185 /*
 186  * Handle deauth with reason.  We retry only for
 187  * the cases where we might succeed.  Otherwise
 188  * we downgrade the ap and scan.
 189  */
 190 static void
 191 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 192 {
 193         switch (reason) {
 194         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 195         case IEEE80211_STATUS_TIMEOUT:
 196         case IEEE80211_REASON_ASSOC_EXPIRE:
 197         case IEEE80211_REASON_NOT_AUTHED:
 198         case IEEE80211_REASON_NOT_ASSOCED:
 199         case IEEE80211_REASON_ASSOC_LEAVE:
 200         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 201                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 202                 break;
 203         default:
 204                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 205                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 206                         ieee80211_check_scan_current(vap);
 207                 break;
 208         }
 209 }
 210
 211 static void
 212 sta_swbmiss_start(struct ieee80211vap *vap)
 213 {
 214
 215         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
 216                 /*
 217                  * Start s/w beacon miss timer for devices w/o
 218                  * hardware support.  We fudge a bit here since
 219                  * we're doing this in software.
 220                  */
 221                 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 222                     2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
 223                 vap->iv_swbmiss_count = 0;
 224                 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 225                     ieee80211_swbmiss, vap);
 226         }
 227 }
 228
 229 /*
 230  * IEEE80211_M_STA vap state machine handler.
 231  * This routine handles the main states in the 802.11 protocol.
 232  */
 233 static int
 234 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 235 {
 236         struct ieee80211com *ic = vap->iv_ic;
 237         struct ieee80211_node *ni;
 238         enum ieee80211_state ostate;
 239
 240         IEEE80211_LOCK_ASSERT(ic);
 241
 242         ostate = vap->iv_state;
 243         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 244             __func__, ieee80211_state_name[ostate],
 245             ieee80211_state_name[nstate], arg);
 246         vap->iv_state = nstate;                 /* state transition */
 247         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 248         if (ostate != IEEE80211_S_SCAN)
 249                 ieee80211_cancel_scan(vap);     /* background scan */
 250         ni = vap->iv_bss;                       /* NB: no reference held */
 251         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 252                 callout_stop(&vap->iv_swbmiss);
 253         switch (nstate) {
 254         case IEEE80211_S_INIT:
 255                 switch (ostate) {
 256                 case IEEE80211_S_SLEEP:
 257                         /* XXX wakeup */
 258                         /* XXX driver hook to wakeup the hardware? */
 259                 case IEEE80211_S_RUN:
 260                         IEEE80211_SEND_MGMT(ni,
 261                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 262                             IEEE80211_REASON_ASSOC_LEAVE);
 263                         ieee80211_sta_leave(ni);
 264                         break;
 265                 case IEEE80211_S_ASSOC:
 266                         IEEE80211_SEND_MGMT(ni,
 267                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 268                             IEEE80211_REASON_AUTH_LEAVE);
 269                         break;
 270                 case IEEE80211_S_SCAN:
 271                         ieee80211_cancel_scan(vap);
 272                         break;
 273                 default:
 274                         break;
 275                 }
 276                 if (ostate != IEEE80211_S_INIT) {
 277                         /* NB: optimize INIT -> INIT case */
 278                         ieee80211_reset_bss(vap);
 279                 }
 280                 if (vap->iv_auth->ia_detach != NULL)
 281                         vap->iv_auth->ia_detach(vap);
 282                 break;
 283         case IEEE80211_S_SCAN:
 284                 switch (ostate) {
 285                 case IEEE80211_S_INIT:
 286                         /*
 287                          * Initiate a scan.  We can come here as a result
 288                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 289                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 290                          * and the scan request parameters will be present
 291                          * in iv_scanreq.  Otherwise we do the default.
 292                          */
 293                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 294                                 ieee80211_check_scan(vap,
 295                                     vap->iv_scanreq_flags,
 296                                     vap->iv_scanreq_duration,
 297                                     vap->iv_scanreq_mindwell,
 298                                     vap->iv_scanreq_maxdwell,
 299                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 300                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 301                         } else
 302                                 ieee80211_check_scan_current(vap);
 303                         break;
 304                 case IEEE80211_S_SCAN:
 305                 case IEEE80211_S_AUTH:
 306                 case IEEE80211_S_ASSOC:
 307                         /*
 308                          * These can happen either because of a timeout
 309                          * on an assoc/auth response or because of a
 310                          * change in state that requires a reset.  For
 311                          * the former we're called with a non-zero arg
 312                          * that is the cause for the failure; pass this
 313                          * to the scan code so it can update state.
 314                          * Otherwise trigger a new scan unless we're in
 315                          * manual roaming mode in which case an application
 316                          * must issue an explicit scan request.
 317                          */
 318                         if (arg != 0)
 319                                 ieee80211_scan_assoc_fail(vap,
 320                                         vap->iv_bss->ni_macaddr, arg);
 321                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 322                                 ieee80211_check_scan_current(vap);
 323                         break;
 324                 case IEEE80211_S_SLEEP:         /* beacon miss */
 325                         /*
 326                          * XXX if in sleep we need to wakeup the hardware.
 327                          */
 328                         /* FALLTHROUGH */
 329                 case IEEE80211_S_RUN:           /* beacon miss */
 330                         /*
 331                          * Beacon miss.  Notify user space and if not
 332                          * under control of a user application (roaming
 333                          * manual) kick off a scan to re-connect.
 334                          */
 335
 336                         ieee80211_sta_leave(ni);
 337                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 338                                 ieee80211_check_scan_current(vap);
 339                         break;
 340                 default:
 341                         goto invalid;
 342                 }
 343                 break;
 344         case IEEE80211_S_AUTH:
 345                 switch (ostate) {
 346                 case IEEE80211_S_INIT:
 347                 case IEEE80211_S_SCAN:
 348                         IEEE80211_SEND_MGMT(ni,
 349                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 350                         break;
 351                 case IEEE80211_S_AUTH:
 352                 case IEEE80211_S_ASSOC:
 353                         switch (arg & 0xff) {
 354                         case IEEE80211_FC0_SUBTYPE_AUTH:
 355                                 /* ??? */
 356                                 IEEE80211_SEND_MGMT(ni,
 357                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 358                                 break;
 359                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 360                                 sta_authretry(vap, ni, arg>>8);
 361                                 break;
 362                         }
 363                         break;
 364                 case IEEE80211_S_SLEEP:
 365                 case IEEE80211_S_RUN:
 366                         switch (arg & 0xff) {
 367                         case IEEE80211_FC0_SUBTYPE_AUTH:
 368                                 IEEE80211_SEND_MGMT(ni,
 369                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 370                                 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
 371                                 break;
 372                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 373                                 ieee80211_sta_leave(ni);
 374                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 375                                         /* try to reauth */
 376                                         IEEE80211_SEND_MGMT(ni,
 377                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 378                                 }
 379                                 break;
 380                         }
 381                         break;
 382                 default:
 383                         goto invalid;
 384                 }
 385                 break;
 386         case IEEE80211_S_ASSOC:
 387                 switch (ostate) {
 388                 case IEEE80211_S_AUTH:
 389                 case IEEE80211_S_ASSOC:
 390                         IEEE80211_SEND_MGMT(ni,
 391                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 392                         break;
 393                 case IEEE80211_S_SLEEP:         /* cannot happen */
 394                 case IEEE80211_S_RUN:
 395                         ieee80211_sta_leave(ni);
 396                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 397                                 IEEE80211_SEND_MGMT(ni, arg ?
 398                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 399                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 400                         }
 401                         break;
 402                 default:
 403                         goto invalid;
 404                 }
 405                 break;
 406         case IEEE80211_S_RUN:
 407                 if (vap->iv_flags & IEEE80211_F_WPA) {
 408                         /* XXX validate prerequisites */
 409                 }
 410                 switch (ostate) {
 411                 case IEEE80211_S_RUN:
 412                 case IEEE80211_S_CSA:
 413                         break;
 414                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 415                 case IEEE80211_S_ASSOC:
 416 #ifdef IEEE80211_DEBUG
 417                         if (ieee80211_msg_debug(vap)) {
 418                                 ieee80211_note(vap, "%s with %s ssid ",
 419                                     (vap->iv_opmode == IEEE80211_M_STA ?
 420                                     "associated" : "synchronized"),
 421                                     ether_sprintf(ni->ni_bssid));
 422                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 423                                     ni->ni_esslen);
 424                                 /* XXX MCS/HT */
 425                                 printf(" channel %d start %uMb\n",
 426                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 427                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 428                         }
 429 #endif
 430                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 431                         ieee80211_notify_node_join(ni,
 432                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 433                         break;
 434                 case IEEE80211_S_SLEEP:
 435                         /* Wake up from sleep */
 436                         vap->iv_sta_ps(vap, 0);
 437                         break;
 438                 default:
 439                         goto invalid;
 440                 }
 441                 ieee80211_sync_curchan(ic);
 442                 if (ostate != IEEE80211_S_RUN)
 443                         sta_swbmiss_start(vap);
 444                 /*
 445                  * When 802.1x is not in use mark the port authorized
 446                  * at this point so traffic can flow.
 447                  */
 448                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 449                         ieee80211_node_authorize(ni);
 450                 /*
 451                  * Fake association when joining an existing bss.
 452                  *
 453                  * Don't do this if we're doing SLEEP->RUN.
 454                  */
 455                 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
 456                         ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
 457                 break;
 458         case IEEE80211_S_CSA:
 459                 if (ostate != IEEE80211_S_RUN)
 460                         goto invalid;
 461                 break;
 462         case IEEE80211_S_SLEEP:
 463                 sta_swbmiss_start(vap);
 464                 vap->iv_sta_ps(vap, 1);
 465                 break;
 466         default:
 467         invalid:
 468                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 469                     "%s: unexpected state transition %s -> %s\n", __func__,
 470                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 471                 break;
 472         }
 473         return 0;
 474 }
 475
 476 /*
 477  * Return non-zero if the frame is an echo of a multicast
 478  * frame sent by ourself.  The dir is known to be DSTODS.
 479  */
 480 static __inline int
 481 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 482 {
 483 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 484 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 485         const uint8_t *sa;
 486
 487         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 488
 489         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 490                 return 0;
 491         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 492         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 493 #undef WH4
 494 #undef QWH4
 495 }
 496
 497 /*
 498  * Return non-zero if the frame is an echo of a multicast
 499  * frame sent by ourself.  The dir is known to be FROMDS.
 500  */
 501 static __inline int
 502 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 503 {
 504         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 505
 506         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 507                 return 0;
 508         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 509 }
 510
 511 /*
 512  * Decide if a received management frame should be
 513  * printed when debugging is enabled.  This filters some
 514  * of the less interesting frames that come frequently
 515  * (e.g. beacons).
 516  */
 517 static __inline int
 518 doprint(struct ieee80211vap *vap, int subtype)
 519 {
 520         switch (subtype) {
 521         case IEEE80211_FC0_SUBTYPE_BEACON:
 522                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 523         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 524                 return 0;
 525         }
 526         return 1;
 527 }
 528
 529 /*
 530  * Process a received frame.  The node associated with the sender
 531  * should be supplied.  If nothing was found in the node table then
 532  * the caller is assumed to supply a reference to iv_bss instead.
 533  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 534  * during AP scanning to select a AP to associate with; it can have
 535  * any units so long as values have consistent units and higher values
 536  * mean ``better signal''.  The receive timestamp is currently not used
 537  * by the 802.11 layer.
 538  */
 539 static int
 540 sta_input(struct ieee80211_node *ni, struct mbuf *m,
 541     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 542 {
 543         struct ieee80211vap *vap = ni->ni_vap;
 544         struct ieee80211com *ic = ni->ni_ic;
 545         struct ifnet *ifp = vap->iv_ifp;
 546         struct ieee80211_frame *wh;
 547         struct ieee80211_key *key;
 548         struct ether_header *eh;
 549         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 550         uint8_t dir, type, subtype, qos;
 551         uint8_t *bssid;
 552         int is_hw_decrypted = 0;
 553         int has_decrypted = 0;
 554
 555         /*
 556          * Some devices do hardware decryption all the way through
 557          * to pretending the frame wasn't encrypted in the first place.
 558          * So, tag it appropriately so it isn't discarded inappropriately.
 559          */
 560         if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
 561                 is_hw_decrypted = 1;
 562
 563         if (m->m_flags & M_AMPDU_MPDU) {
 564                 /*
 565                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 566                  * w/ M_AMPDU_MPDU marked have already passed through
 567                  * here but were received out of order and been held on
 568                  * the reorder queue.  When resubmitted they are marked
 569                  * with the M_AMPDU_MPDU flag and we can bypass most of
 570                  * the normal processing.
 571                  */
 572                 wh = mtod(m, struct ieee80211_frame *);
 573                 type = IEEE80211_FC0_TYPE_DATA;
 574                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 575                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 576                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 577                 goto resubmit_ampdu;
 578         }
 579
 580         KASSERT(ni != NULL, ("null node"));
 581         ni->ni_inact = ni->ni_inact_reload;
 582
 583         type = -1;                      /* undefined */
 584
 585         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 586                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 587                     ni->ni_macaddr, NULL,
 588                     "too short (1): len %u", m->m_pkthdr.len);
 589                 vap->iv_stats.is_rx_tooshort++;
 590                 goto out;
 591         }
 592         /*
 593          * Bit of a cheat here, we use a pointer for a 3-address
 594          * frame format but don't reference fields past outside
 595          * ieee80211_frame_min w/o first validating the data is
 596          * present.
 597          */
 598         wh = mtod(m, struct ieee80211_frame *);
 599
 600         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 601             IEEE80211_FC0_VERSION_0) {
 602                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 603                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 604                     wh->i_fc[0], wh->i_fc[1]);
 605                 vap->iv_stats.is_rx_badversion++;
 606                 goto err;
 607         }
 608
 609         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 610         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 611         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 612         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 613                 bssid = wh->i_addr2;
 614                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 615                         /* not interested in */
 616                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 617                             bssid, NULL, "%s", "not to bss");
 618                         vap->iv_stats.is_rx_wrongbss++;
 619                         goto out;
 620                 }
 621
 622                 /*
 623                  * Some devices may be in a promiscuous mode
 624                  * where they receive frames for multiple station
 625                  * addresses.
 626                  *
 627                  * If we receive a data frame that isn't
 628                  * destined to our VAP MAC, drop it.
 629                  *
 630                  * XXX TODO: This is only enforced when not scanning;
 631                  * XXX it assumes a software-driven scan will put the NIC
 632                  * XXX into a "no data frames" mode before setting this
 633                  * XXX flag. Otherwise it may be possible that we'll still
 634                  * XXX process data frames whilst scanning.
 635                  */
 636                 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
 637                     && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
 638                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 639                             bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
 640                             IF_LLADDR(ifp), ":", wh->i_addr1, ":");
 641                         vap->iv_stats.is_rx_wrongbss++;
 642                         goto out;
 643                 }
 644
 645                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 646                 ni->ni_noise = nf;
 647                 if ( IEEE80211_HAS_SEQ(type, subtype) &&
 648                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 649                         uint8_t tid = ieee80211_gettid(wh);
 650                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 651                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 652                                 ic->ic_wme.wme_hipri_traffic++;
 653                         if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
 654                                 goto out;
 655                 }
 656         }
 657
 658         switch (type) {
 659         case IEEE80211_FC0_TYPE_DATA:
 660                 hdrspace = ieee80211_hdrspace(ic, wh);
 661                 if (m->m_len < hdrspace &&
 662                     (m = m_pullup(m, hdrspace)) == NULL) {
 663                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 664                             ni->ni_macaddr, NULL,
 665                             "data too short: expecting %u", hdrspace);
 666                         vap->iv_stats.is_rx_tooshort++;
 667                         goto out;               /* XXX */
 668                 }
 669                 /*
 670                  * Handle A-MPDU re-ordering.  If the frame is to be
 671                  * processed directly then ieee80211_ampdu_reorder
 672                  * will return 0; otherwise it has consumed the mbuf
 673                  * and we should do nothing more with it.
 674                  */
 675                 if ((m->m_flags & M_AMPDU) &&
 676                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 677                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 678                     ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
 679                         m = NULL;
 680                         goto out;
 681                 }
 682         resubmit_ampdu:
 683                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 684                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 685                             isfromds_mcastecho(vap, wh)) {
 686                                 /*
 687                                  * In IEEE802.11 network, multicast
 688                                  * packets sent from "me" are broadcast
 689                                  * from the AP; silently discard for
 690                                  * SIMPLEX interface.
 691                                  */
 692                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 693                                     wh, "data", "%s", "multicast echo");
 694                                 vap->iv_stats.is_rx_mcastecho++;
 695                                 goto out;
 696                         }
 697                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 698                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 699                                 /*
 700                                  * DWDS sta's must drop 3-address mcast frames
 701                                  * as they will be sent separately as a 4-addr
 702                                  * frame.  Accepting the 3-addr frame will
 703                                  * confuse the bridge into thinking the sending
 704                                  * sta is located at the end of WDS link.
 705                                  */
 706                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 707                                     "3-address data", "%s", "DWDS enabled");
 708                                 vap->iv_stats.is_rx_mcastecho++;
 709                                 goto out;
 710                         }
 711                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 712                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 713                                 IEEE80211_DISCARD(vap,
 714                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 715                                     "%s", "DWDS not enabled");
 716                                 vap->iv_stats.is_rx_wrongdir++;
 717                                 goto out;
 718                         }
 719                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 720                             isdstods_mcastecho(vap, wh)) {
 721                                 /*
 722                                  * In IEEE802.11 network, multicast
 723                                  * packets sent from "me" are broadcast
 724                                  * from the AP; silently discard for
 725                                  * SIMPLEX interface.
 726                                  */
 727                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 728                                     "4-address data", "%s", "multicast echo");
 729                                 vap->iv_stats.is_rx_mcastecho++;
 730                                 goto out;
 731                         }
 732                 } else {
 733                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 734                             "data", "incorrect dir 0x%x", dir);
 735                         vap->iv_stats.is_rx_wrongdir++;
 736                         goto out;
 737                 }
 738
 739                 /*
 740                  * Handle privacy requirements for hardware decryption
 741                  * devices.
 742                  *
 743                  * For those devices, a handful of things happen.
 744                  *
 745                  * + If IV has been stripped, then we can't run
 746                  *   ieee80211_crypto_decap() - none of the key
 747                  * + If MIC has been stripped, we can't validate
 748                  *   MIC here.
 749                  * + If MIC fails, then we need to communicate a
 750                  *   MIC failure up to the stack - but we don't know
 751                  *   which key was used.
 752                  */
 753
 754                 /*
 755                  * Handle privacy requirements.  Note that we
 756                  * must not be preempted from here until after
 757                  * we (potentially) call ieee80211_crypto_demic;
 758                  * otherwise we may violate assumptions in the
 759                  * crypto cipher modules used to do delayed update
 760                  * of replay sequence numbers.
 761                  */
 762                 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 763                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 764                                 /*
 765                                  * Discard encrypted frames when privacy is off.
 766                                  */
 767                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 768                                     wh, "WEP", "%s", "PRIVACY off");
 769                                 vap->iv_stats.is_rx_noprivacy++;
 770                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 771                                 goto out;
 772                         }
 773                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 774                                 /* NB: stats+msgs handled in crypto_decap */
 775                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 776                                 goto out;
 777                         }
 778                         wh = mtod(m, struct ieee80211_frame *);
 779                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 780                         has_decrypted = 1;
 781                 } else {
 782                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 783                         key = NULL;
 784                 }
 785
 786                 /*
 787                  * Save QoS bits for use below--before we strip the header.
 788                  */
 789                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 790                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 791                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 792                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 793                 } else
 794                         qos = 0;
 795
 796                 /*
 797                  * Next up, any fragmentation.
 798                  */
 799                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 800                         m = ieee80211_defrag(ni, m, hdrspace);
 801                         if (m == NULL) {
 802                                 /* Fragment dropped or frame not complete yet */
 803                                 goto out;
 804                         }
 805                 }
 806                 wh = NULL;              /* no longer valid, catch any uses */
 807
 808                 /*
 809                  * Next strip any MSDU crypto bits.
 810                  *
 811                  * Note: we can't do MIC stripping/verification if the
 812                  * upper layer has stripped it.  We have to check MIC
 813                  * ourselves.  So, key may be NULL, but we have to check
 814                  * the RX status.
 815                  */
 816                 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
 817                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 818                             ni->ni_macaddr, "data", "%s", "demic error");
 819                         vap->iv_stats.is_rx_demicfail++;
 820                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 821                         goto out;
 822                 }
 823
 824                 /* copy to listener after decrypt */
 825                 if (ieee80211_radiotap_active_vap(vap))
 826                         ieee80211_radiotap_rx(vap, m);
 827                 need_tap = 0;
 828
 829                 /*
 830                  * Finally, strip the 802.11 header.
 831                  */
 832                 m = ieee80211_decap(vap, m, hdrspace);
 833                 if (m == NULL) {
 834                         /* XXX mask bit to check for both */
 835                         /* don't count Null data frames as errors */
 836                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 837                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 838                                 goto out;
 839                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 840                             ni->ni_macaddr, "data", "%s", "decap error");
 841                         vap->iv_stats.is_rx_decap++;
 842                         IEEE80211_NODE_STAT(ni, rx_decap);
 843                         goto err;
 844                 }
 845                 eh = mtod(m, struct ether_header *);
 846                 if (!ieee80211_node_is_authorized(ni)) {
 847                         /*
 848                          * Deny any non-PAE frames received prior to
 849                          * authorization.  For open/shared-key
 850                          * authentication the port is mark authorized
 851                          * after authentication completes.  For 802.1x
 852                          * the port is not marked authorized by the
 853                          * authenticator until the handshake has completed.
 854                          */
 855                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 856                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 857                                     eh->ether_shost, "data",
 858                                     "unauthorized port: ether type 0x%x len %u",
 859                                     eh->ether_type, m->m_pkthdr.len);
 860                                 vap->iv_stats.is_rx_unauth++;
 861                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 862                                 goto err;
 863                         }
 864                 } else {
 865                         /*
 866                          * When denying unencrypted frames, discard
 867                          * any non-PAE frames received without encryption.
 868                          */
 869                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 870                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 871                             (is_hw_decrypted == 0) &&
 872                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 873                                 /*
 874                                  * Drop unencrypted frames.
 875                                  */
 876                                 vap->iv_stats.is_rx_unencrypted++;
 877                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 878                                 goto out;
 879                         }
 880                 }
 881                 /* XXX require HT? */
 882                 if (qos & IEEE80211_QOS_AMSDU) {
 883                         m = ieee80211_decap_amsdu(ni, m);
 884                         if (m == NULL)
 885                                 return IEEE80211_FC0_TYPE_DATA;
 886                 } else {
 887 #ifdef IEEE80211_SUPPORT_SUPERG
 888                         m = ieee80211_decap_fastframe(vap, ni, m);
 889                         if (m == NULL)
 890                                 return IEEE80211_FC0_TYPE_DATA;
 891 #endif
 892                 }
 893                 ieee80211_deliver_data(vap, ni, m);
 894                 return IEEE80211_FC0_TYPE_DATA;
 895
 896         case IEEE80211_FC0_TYPE_MGT:
 897                 vap->iv_stats.is_rx_mgmt++;
 898                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 899                 if (dir != IEEE80211_FC1_DIR_NODS) {
 900                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 901                             wh, "data", "incorrect dir 0x%x", dir);
 902                         vap->iv_stats.is_rx_wrongdir++;
 903                         goto err;
 904                 }
 905                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 906                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 907                             ni->ni_macaddr, "mgt", "too short: len %u",
 908                             m->m_pkthdr.len);
 909                         vap->iv_stats.is_rx_tooshort++;
 910                         goto out;
 911                 }
 912 #ifdef IEEE80211_DEBUG
 913                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 914                     ieee80211_msg_dumppkts(vap)) {
 915                         if_printf(ifp, "received %s from %s rssi %d\n",
 916                             ieee80211_mgt_subtype_name(subtype),
 917                             ether_sprintf(wh->i_addr2), rssi);
 918                 }
 919 #endif
 920
 921                 /*
 922                  * Note: See above for hardware offload privacy requirements.
 923                  *       It also applies here.
 924                  */
 925
 926                 /*
 927                  * Again, having encrypted flag set check would be good, but
 928                  * then we have to also handle crypto_decap() like above.
 929                  */
 930                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 931                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 932                                 /*
 933                                  * Only shared key auth frames with a challenge
 934                                  * should be encrypted, discard all others.
 935                                  */
 936                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 937                                     wh, ieee80211_mgt_subtype_name(subtype),
 938                                     "%s", "WEP set but not permitted");
 939                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 940                                 goto out;
 941                         }
 942                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 943                                 /*
 944                                  * Discard encrypted frames when privacy is off.
 945                                  */
 946                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 947                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 948                                 vap->iv_stats.is_rx_noprivacy++;
 949                                 goto out;
 950                         }
 951                         hdrspace = ieee80211_hdrspace(ic, wh);
 952
 953                         /*
 954                          * Again, if IV/MIC was stripped, then this whole
 955                          * setup will fail.  That's going to need some poking.
 956                          */
 957                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 958                                 /* NB: stats+msgs handled in crypto_decap */
 959                                 goto out;
 960                         }
 961                         has_decrypted = 1;
 962                         wh = mtod(m, struct ieee80211_frame *);
 963                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 964                 }
 965                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 966                 goto out;
 967
 968         case IEEE80211_FC0_TYPE_CTL:
 969                 vap->iv_stats.is_rx_ctl++;
 970                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 971                 vap->iv_recv_ctl(ni, m, subtype);
 972                 goto out;
 973
 974         default:
 975                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 976                     wh, NULL, "bad frame type 0x%x", type);
 977                 /* should not come here */
 978                 break;
 979         }
 980 err:
 981         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 982 out:
 983         if (m != NULL) {
 984                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 985                         ieee80211_radiotap_rx(vap, m);
 986                 m_freem(m);
 987         }
 988         return type;
 989 }
 990
 991 static void
 992 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 993     int rssi, int nf, uint16_t seq, uint16_t status)
 994 {
 995         struct ieee80211vap *vap = ni->ni_vap;
 996
 997         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 998                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 999                     ni->ni_macaddr, "open auth",
1000                     "bad sta auth mode %u", ni->ni_authmode);
1001                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
1002                 return;
1003         }
1004         if (vap->iv_state != IEEE80211_S_AUTH ||
1005             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
1006                 vap->iv_stats.is_rx_bad_auth++;
1007                 return;
1008         }
1009         if (status != 0) {
1010                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1011                     ni, "open auth failed (reason %d)", status);
1012                 vap->iv_stats.is_rx_auth_fail++;
1013                 vap->iv_stats.is_rx_authfail_code = status;
1014                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1015                     IEEE80211_SCAN_FAIL_STATUS);
1016         } else
1017                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1018 }
1019
1020 static void
1021 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1022     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1023     uint16_t seq, uint16_t status)
1024 {
1025         struct ieee80211vap *vap = ni->ni_vap;
1026         uint8_t *challenge;
1027
1028         /*
1029          * NB: this can happen as we allow pre-shared key
1030          * authentication to be enabled w/o wep being turned
1031          * on so that configuration of these can be done
1032          * in any order.  It may be better to enforce the
1033          * ordering in which case this check would just be
1034          * for sanity/consistency.
1035          */
1036         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1037                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1038                     ni->ni_macaddr, "shared key auth",
1039                     "%s", " PRIVACY is disabled");
1040                 goto bad;
1041         }
1042         /*
1043          * Pre-shared key authentication is evil; accept
1044          * it only if explicitly configured (it is supported
1045          * mainly for compatibility with clients like OS X).
1046          */
1047         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1048             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1049                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1050                     ni->ni_macaddr, "shared key auth",
1051                     "bad sta auth mode %u", ni->ni_authmode);
1052                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1053                 goto bad;
1054         }
1055
1056         challenge = NULL;
1057         if (frm + 1 < efrm) {
1058                 if ((frm[1] + 2) > (efrm - frm)) {
1059                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1060                             ni->ni_macaddr, "shared key auth",
1061                             "ie %d/%d too long",
1062                             frm[0], (frm[1] + 2) - (efrm - frm));
1063                         vap->iv_stats.is_rx_bad_auth++;
1064                         goto bad;
1065                 }
1066                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1067                         challenge = frm;
1068                 frm += frm[1] + 2;
1069         }
1070         switch (seq) {
1071         case IEEE80211_AUTH_SHARED_CHALLENGE:
1072         case IEEE80211_AUTH_SHARED_RESPONSE:
1073                 if (challenge == NULL) {
1074                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1075                             ni->ni_macaddr, "shared key auth",
1076                             "%s", "no challenge");
1077                         vap->iv_stats.is_rx_bad_auth++;
1078                         goto bad;
1079                 }
1080                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1081                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1082                             ni->ni_macaddr, "shared key auth",
1083                             "bad challenge len %d", challenge[1]);
1084                         vap->iv_stats.is_rx_bad_auth++;
1085                         goto bad;
1086                 }
1087         default:
1088                 break;
1089         }
1090         if (vap->iv_state != IEEE80211_S_AUTH)
1091                 return;
1092         switch (seq) {
1093         case IEEE80211_AUTH_SHARED_PASS:
1094                 if (ni->ni_challenge != NULL) {
1095                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1096                         ni->ni_challenge = NULL;
1097                 }
1098                 if (status != 0) {
1099                         IEEE80211_NOTE_FRAME(vap,
1100                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1101                             "shared key auth failed (reason %d)", status);
1102                         vap->iv_stats.is_rx_auth_fail++;
1103                         vap->iv_stats.is_rx_authfail_code = status;
1104                         return;
1105                 }
1106                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1107                 break;
1108         case IEEE80211_AUTH_SHARED_CHALLENGE:
1109                 if (!ieee80211_alloc_challenge(ni))
1110                         return;
1111                 /* XXX could optimize by passing recvd challenge */
1112                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1113                 IEEE80211_SEND_MGMT(ni,
1114                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1115                 break;
1116         default:
1117                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1118                     wh, "shared key auth", "bad seq %d", seq);
1119                 vap->iv_stats.is_rx_bad_auth++;
1120                 return;
1121         }
1122         return;
1123 bad:
1124         /*
1125          * Kick the state machine.  This short-circuits
1126          * using the mgt frame timeout to trigger the
1127          * state transition.
1128          */
1129         if (vap->iv_state == IEEE80211_S_AUTH)
1130                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1131                     IEEE80211_SCAN_FAIL_STATUS);
1132 }
1133
1134 int
1135 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1136         const struct ieee80211_frame *wh)
1137 {
1138 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1139         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1140         u_int len = frm[1], qosinfo;
1141         int i;
1142
1143         if (len < sizeof(struct ieee80211_wme_param)-2) {
1144                 IEEE80211_DISCARD_IE(vap,
1145                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1146                     wh, "WME", "too short, len %u", len);
1147                 return -1;
1148         }
1149         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1150         qosinfo &= WME_QOSINFO_COUNT;
1151         /* XXX do proper check for wraparound */
1152         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1153                 return 0;
1154         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1155         for (i = 0; i < WME_NUM_AC; i++) {
1156                 struct wmeParams *wmep =
1157                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1158                 /* NB: ACI not used */
1159                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1160                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1161                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1162                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1163                 wmep->wmep_txopLimit = le16dec(frm+2);
1164                 frm += 4;
1165         }
1166         wme->wme_wmeChanParams.cap_info = qosinfo;
1167         return 1;
1168 #undef MS
1169 }
1170
1171 /*
1172  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1173  * is the first CSA then initiate the switch.  Otherwise we
1174  * track state and trigger completion and/or cancel of the switch.
1175  * XXX should be public for IBSS use
1176  */
1177 static void
1178 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1179         const struct ieee80211_frame *wh)
1180 {
1181         struct ieee80211com *ic = vap->iv_ic;
1182         const struct ieee80211_csa_ie *csa =
1183             (const struct ieee80211_csa_ie *) frm;
1184
1185         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1186             ("state %s", ieee80211_state_name[vap->iv_state]));
1187
1188         if (csa->csa_mode > 1) {
1189                 IEEE80211_DISCARD_IE(vap,
1190                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1191                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1192                 return;
1193         }
1194         IEEE80211_LOCK(ic);
1195         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1196                 /*
1197                  * Convert the channel number to a channel reference.  We
1198                  * try first to preserve turbo attribute of the current
1199                  * channel then fallback.  Note this will not work if the
1200                  * CSA specifies a channel that requires a band switch (e.g.
1201                  * 11a => 11g).  This is intentional as 11h is defined only
1202                  * for 5GHz/11a and because the switch does not involve a
1203                  * reassociation, protocol state (capabilities, negotated
1204                  * rates, etc) may/will be wrong.
1205                  */
1206                 struct ieee80211_channel *c =
1207                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1208                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1209                 if (c == NULL) {
1210                         c = ieee80211_find_channel_byieee(ic,
1211                             csa->csa_newchan,
1212                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1213                         if (c == NULL) {
1214                                 IEEE80211_DISCARD_IE(vap,
1215                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1216                                     wh, "CSA", "invalid channel %u",
1217                                     csa->csa_newchan);
1218                                 goto done;
1219                         }
1220                 }
1221 #if IEEE80211_CSA_COUNT_MIN > 0
1222                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1223                         /*
1224                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1225                          * reduce the risk of being redirected by a fabricated
1226                          * CSA.  If a valid CSA is dropped we'll still get a
1227                          * beacon miss when the AP leaves the channel so we'll
1228                          * eventually follow to the new channel.
1229                          *
1230                          * NOTE: this violates the 11h spec that states that
1231                          * count may be any value and if 0 then a switch
1232                          * should happen asap.
1233                          */
1234                         IEEE80211_DISCARD_IE(vap,
1235                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1236                             wh, "CSA", "count %u too small, must be >= %u",
1237                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1238                         goto done;
1239                 }
1240 #endif
1241                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1242         } else {
1243                 /*
1244                  * Validate this ie against the initial CSA.  We require
1245                  * mode and channel not change and the count must be
1246                  * monotonically decreasing.  This may be pointless and
1247                  * canceling the switch as a result may be too paranoid but
1248                  * in the worst case if we drop out of CSA because of this
1249                  * and the AP does move then we'll just end up taking a
1250                  * beacon miss and scan to find the AP.
1251                  *
1252                  * XXX may want <= on count as we also process ProbeResp
1253                  * frames and those may come in w/ the same count as the
1254                  * previous beacon; but doing so leaves us open to a stuck
1255                  * count until we add a dead-man timer
1256                  */
1257                 if (!(csa->csa_count < ic->ic_csa_count &&
1258                       csa->csa_mode == ic->ic_csa_mode &&
1259                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1260                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1261                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1262                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1263                             ic->ic_csa_newchan, ic->ic_csa_count,
1264                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1265                         ieee80211_csa_cancelswitch(ic);
1266                 } else {
1267                         if (csa->csa_count <= 1)
1268                                 ieee80211_csa_completeswitch(ic);
1269                         else
1270                                 ic->ic_csa_count = csa->csa_count;
1271                 }
1272         }
1273 done:
1274         IEEE80211_UNLOCK(ic);
1275 }
1276
1277 /*
1278  * Return non-zero if a background scan may be continued:
1279  * o bg scan is active
1280  * o no channel switch is pending
1281  * o there has not been any traffic recently
1282  * o no full-offload scan support (no need for explicitly continuing scan then)
1283  *
1284  * Note we do not check if there is an administrative enable;
1285  * this is only done to start the scan.  We assume that any
1286  * change in state will be accompanied by a request to cancel
1287  * active scans which will otherwise cause this test to fail.
1288  */
1289 static __inline int
1290 contbgscan(struct ieee80211vap *vap)
1291 {
1292         struct ieee80211com *ic = vap->iv_ic;
1293
1294         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1295             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1296             !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) &&
1297             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1298             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1299 }
1300
1301 /*
1302  * Return non-zero if a backgrond scan may be started:
1303  * o bg scanning is administratively enabled
1304  * o no channel switch is pending
1305  * o we are not boosted on a dynamic turbo channel
1306  * o there has not been a scan recently
1307  * o there has not been any traffic recently (don't check if full-offload scan)
1308  */
1309 static __inline int
1310 startbgscan(struct ieee80211vap *vap)
1311 {
1312         struct ieee80211com *ic = vap->iv_ic;
1313
1314         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1315             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1316 #ifdef IEEE80211_SUPPORT_SUPERG
1317             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1318 #endif
1319             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1320             ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) ||
1321              ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)));
1322 }
1323
1324 #ifdef  notyet
1325 /*
1326  * Compare two quiet IEs and return if they are equivalent.
1327  *
1328  * The tbttcount isnt checked - that's not part of the configuration.
1329  */
1330 static int
1331 compare_quiet_ie(const struct ieee80211_quiet_ie *q1,
1332     const struct ieee80211_quiet_ie *q2)
1333 {
1334
1335         if (q1->period != q2->period)
1336                 return (0);
1337         if (le16dec(&q1->duration) != le16dec(&q2->duration))
1338                 return (0);
1339         if (le16dec(&q1->offset) != le16dec(&q2->offset))
1340                 return (0);
1341         return (1);
1342 }
1343 #endif
1344
1345 static void
1346 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1347     const struct ieee80211_rx_stats *rxs,
1348     int rssi, int nf)
1349 {
1350 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1351         struct ieee80211vap *vap = ni->ni_vap;
1352         struct ieee80211com *ic = ni->ni_ic;
1353         struct ieee80211_channel *rxchan = ic->ic_curchan;
1354         struct ieee80211_frame *wh;
1355         uint8_t *frm, *efrm;
1356         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1357         uint8_t *vhtcap, *vhtopmode;
1358         uint8_t rate;
1359         int ht_state_change = 0, do_ht = 0;
1360
1361         wh = mtod(m0, struct ieee80211_frame *);
1362         frm = (uint8_t *)&wh[1];
1363         efrm = mtod(m0, uint8_t *) + m0->m_len;
1364         switch (subtype) {
1365         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1366         case IEEE80211_FC0_SUBTYPE_BEACON: {
1367                 struct ieee80211_scanparams scan;
1368                 struct ieee80211_channel *c;
1369                 /*
1370                  * We process beacon/probe response frames:
1371                  *    o when scanning, or
1372                  *    o station mode when associated (to collect state
1373                  *      updates such as 802.11g slot time)
1374                  * Frames otherwise received are discarded.
1375                  */
1376                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1377                         vap->iv_stats.is_rx_mgtdiscard++;
1378                         return;
1379                 }
1380
1381                 /* Override RX channel as appropriate */
1382                 if (rxs != NULL) {
1383                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1384                         if (c != NULL)
1385                                 rxchan = c;
1386                 }
1387
1388                 /* XXX probe response in sta mode when !scanning? */
1389                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1390                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1391                                 vap->iv_stats.is_beacon_bad++;
1392                         return;
1393                 }
1394
1395                 /*
1396                  * Count frame now that we know it's to be processed.
1397                  */
1398                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1399                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1400                         IEEE80211_NODE_STAT(ni, rx_beacons);
1401                 } else
1402                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1403                 /*
1404                  * When operating in station mode, check for state updates.
1405                  * Be careful to ignore beacons received while doing a
1406                  * background scan.  We consider only 11g/WMM stuff right now.
1407                  */
1408                 if (ni->ni_associd != 0 &&
1409                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1410                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1411                         /* record tsf of last beacon */
1412                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1413                                 sizeof(ni->ni_tstamp));
1414                         /* count beacon frame for s/w bmiss handling */
1415                         vap->iv_swbmiss_count++;
1416                         vap->iv_bmiss_count = 0;
1417                         if (ni->ni_erp != scan.erp) {
1418                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1419                                     wh->i_addr2,
1420                                     "erp change: was 0x%x, now 0x%x",
1421                                     ni->ni_erp, scan.erp);
1422                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1423                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1424                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1425                                 else
1426                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1427                                 ni->ni_erp = scan.erp;
1428                                 /* XXX statistic */
1429                                 /* XXX driver notification */
1430                         }
1431                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1432                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1433                                     wh->i_addr2,
1434                                     "capabilities change: was 0x%x, now 0x%x",
1435                                     ni->ni_capinfo, scan.capinfo);
1436                                 /*
1437                                  * NB: we assume short preamble doesn't
1438                                  *     change dynamically
1439                                  */
1440                                 ieee80211_set_shortslottime(ic,
1441                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1442                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1443                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1444                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1445                                 /* XXX statistic */
1446                         }
1447                         if (scan.wme != NULL &&
1448                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1449                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1450                                 ieee80211_wme_updateparams(vap);
1451 #ifdef IEEE80211_SUPPORT_SUPERG
1452                         if (scan.ath != NULL)
1453                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1454 #endif
1455                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1456                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1457                                 /* XXX state changes? */
1458                                 ieee80211_ht_updateparams(ni,
1459                                     scan.htcap, scan.htinfo);
1460                                 do_ht = 1;
1461                         }
1462                         if (scan.vhtcap != NULL && scan.vhtopmode != NULL &&
1463                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1464                                 /* XXX state changes? */
1465                                 ieee80211_vht_updateparams(ni,
1466                                     scan.vhtcap, scan.vhtopmode);
1467                                 do_ht = 1;
1468                         }
1469                         if (do_ht) {
1470                                 if (ieee80211_ht_updateparams_final(ni,
1471                                     scan.htcap, scan.htinfo))
1472                                         ht_state_change = 1;
1473                         }
1474
1475                         /*
1476                          * If we have a quiet time IE then report it up to
1477                          * the driver.
1478                          *
1479                          * Otherwise, inform the driver that the quiet time
1480                          * IE has disappeared - only do that once rather than
1481                          * spamming it each time.
1482                          */
1483                         if (scan.quiet) {
1484                                 ic->ic_set_quiet(ni, scan.quiet);
1485                                 ni->ni_quiet_ie_set = 1;
1486                                 memcpy(&ni->ni_quiet_ie, scan.quiet,
1487                                     sizeof(struct ieee80211_quiet_ie));
1488                         } else {
1489                                 if (ni->ni_quiet_ie_set == 1)
1490                                         ic->ic_set_quiet(ni, NULL);
1491                                 ni->ni_quiet_ie_set = 0;
1492                                 bzero(&ni->ni_quiet_ie,
1493                                     sizeof(struct ieee80211_quiet_ie));
1494                         }
1495
1496                         if (scan.tim != NULL) {
1497                                 struct ieee80211_tim_ie *tim =
1498                                     (struct ieee80211_tim_ie *) scan.tim;
1499                                 /*
1500                                  * XXX Check/debug this code; see if it's about
1501                                  * the right time to force the VAP awake if we
1502                                  * receive a frame destined for us?
1503                                  */
1504                                 int aid = IEEE80211_AID(ni->ni_associd);
1505                                 int ix = aid / NBBY;
1506                                 int min = tim->tim_bitctl &~ 1;
1507                                 int max = tim->tim_len + min - 4;
1508                                 int tim_ucast = 0, tim_mcast = 0;
1509
1510                                 /*
1511                                  * Only do this for unicast traffic in the TIM
1512                                  * The multicast traffic notification for
1513                                  * the scan notification stuff should occur
1514                                  * differently.
1515                                  */
1516                                 if (min <= ix && ix <= max &&
1517                                      isset(tim->tim_bitmap - min, aid)) {
1518                                         tim_ucast = 1;
1519                                 }
1520
1521                                 /*
1522                                  * Do a separate notification
1523                                  * for the multicast bit being set.
1524                                  */
1525                                 if (tim->tim_bitctl & 1) {
1526                                         tim_mcast = 1;
1527                                 }
1528
1529                                 /*
1530                                  * If the TIM indicates there's traffic for
1531                                  * us then get us out of STA mode powersave.
1532                                  */
1533                                 if (tim_ucast == 1) {
1534
1535                                         /*
1536                                          * Wake us out of SLEEP state if we're
1537                                          * in it; and if we're doing bgscan
1538                                          * then wake us out of STA powersave.
1539                                          */
1540                                         ieee80211_sta_tim_notify(vap, 1);
1541
1542                                         /*
1543                                          * This is preventing us from
1544                                          * continuing a bgscan; because it
1545                                          * tricks the contbgscan()
1546                                          * routine to think there's always
1547                                          * traffic for us.
1548                                          *
1549                                          * I think we need both an RX and
1550                                          * TX ic_lastdata field.
1551                                          */
1552                                         ic->ic_lastdata = ticks;
1553                                 }
1554
1555                                 ni->ni_dtim_count = tim->tim_count;
1556                                 ni->ni_dtim_period = tim->tim_period;
1557                         }
1558                         if (scan.csa != NULL &&
1559                             (vap->iv_flags & IEEE80211_F_DOTH))
1560                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1561                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1562                                 /*
1563                                  * No CSA ie or 11h disabled, but a channel
1564                                  * switch is pending; drop out so we aren't
1565                                  * stuck in CSA state.  If the AP really is
1566                                  * moving we'll get a beacon miss and scan.
1567                                  */
1568                                 IEEE80211_LOCK(ic);
1569                                 ieee80211_csa_cancelswitch(ic);
1570                                 IEEE80211_UNLOCK(ic);
1571                         }
1572                         /*
1573                          * If scanning, pass the info to the scan module.
1574                          * Otherwise, check if it's the right time to do
1575                          * a background scan.  Background scanning must
1576                          * be enabled and we must not be operating in the
1577                          * turbo phase of dynamic turbo mode.  Then,
1578                          * it's been a while since the last background
1579                          * scan and if no data frames have come through
1580                          * recently, kick off a scan.  Note that this
1581                          * is the mechanism by which a background scan
1582                          * is started _and_ continued each time we
1583                          * return on-channel to receive a beacon from
1584                          * our ap.
1585                          */
1586                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1587                                 ieee80211_add_scan(vap, rxchan,
1588                                     &scan, wh, subtype, rssi, nf);
1589                         } else if (contbgscan(vap)) {
1590                                 ieee80211_bg_scan(vap, 0);
1591                         } else if (startbgscan(vap)) {
1592                                 vap->iv_stats.is_scan_bg++;
1593 #if 0
1594                                 /* wakeup if we are sleeing */
1595                                 ieee80211_set_pwrsave(vap, 0);
1596 #endif
1597                                 ieee80211_bg_scan(vap, 0);
1598                         }
1599
1600                         /*
1601                          * Put the station to sleep if we haven't seen
1602                          * traffic in a while.
1603                          */
1604                         IEEE80211_LOCK(ic);
1605                         ieee80211_sta_ps_timer_check(vap);
1606                         IEEE80211_UNLOCK(ic);
1607
1608                         /*
1609                          * If we've had a channel width change (eg HT20<->HT40)
1610                          * then schedule a delayed driver notification.
1611                          */
1612                         if (ht_state_change)
1613                                 ieee80211_update_chw(ic);
1614                         return;
1615                 }
1616                 /*
1617                  * If scanning, just pass information to the scan module.
1618                  */
1619                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1620                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1621                                 /*
1622                                  * Actively scanning a channel marked passive;
1623                                  * send a probe request now that we know there
1624                                  * is 802.11 traffic present.
1625                                  *
1626                                  * XXX check if the beacon we recv'd gives
1627                                  * us what we need and suppress the probe req
1628                                  */
1629                                 ieee80211_probe_curchan(vap, 1);
1630                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1631                         }
1632                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1633                             subtype, rssi, nf);
1634                         return;
1635                 }
1636                 break;
1637         }
1638
1639         case IEEE80211_FC0_SUBTYPE_AUTH: {
1640                 uint16_t algo, seq, status;
1641                 /*
1642                  * auth frame format
1643                  *      [2] algorithm
1644                  *      [2] sequence
1645                  *      [2] status
1646                  *      [tlv*] challenge
1647                  */
1648                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1649                 algo   = le16toh(*(uint16_t *)frm);
1650                 seq    = le16toh(*(uint16_t *)(frm + 2));
1651                 status = le16toh(*(uint16_t *)(frm + 4));
1652                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1653                     "recv auth frame with algorithm %d seq %d", algo, seq);
1654
1655                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1656                         IEEE80211_DISCARD(vap,
1657                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1658                             wh, "auth", "%s", "TKIP countermeasures enabled");
1659                         vap->iv_stats.is_rx_auth_countermeasures++;
1660                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1661                                 ieee80211_send_error(ni, wh->i_addr2,
1662                                         IEEE80211_FC0_SUBTYPE_AUTH,
1663                                         IEEE80211_REASON_MIC_FAILURE);
1664                         }
1665                         return;
1666                 }
1667                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1668                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1669                             seq, status);
1670                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1671                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1672                 else {
1673                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1674                             wh, "auth", "unsupported alg %d", algo);
1675                         vap->iv_stats.is_rx_auth_unsupported++;
1676                         return;
1677                 }
1678                 break;
1679         }
1680
1681         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1682         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1683                 uint16_t capinfo, associd;
1684                 uint16_t status;
1685
1686                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1687                         vap->iv_stats.is_rx_mgtdiscard++;
1688                         return;
1689                 }
1690
1691                 /*
1692                  * asresp frame format
1693                  *      [2] capability information
1694                  *      [2] status
1695                  *      [2] association ID
1696                  *      [tlv] supported rates
1697                  *      [tlv] extended supported rates
1698                  *      [tlv] WME
1699                  *      [tlv] HT capabilities
1700                  *      [tlv] HT info
1701                  */
1702                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1703                 ni = vap->iv_bss;
1704                 capinfo = le16toh(*(uint16_t *)frm);
1705                 frm += 2;
1706                 status = le16toh(*(uint16_t *)frm);
1707                 frm += 2;
1708                 if (status != 0) {
1709                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1710                             wh->i_addr2, "%sassoc failed (reason %d)",
1711                             ISREASSOC(subtype) ?  "re" : "", status);
1712                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1713                         return;
1714                 }
1715                 associd = le16toh(*(uint16_t *)frm);
1716                 frm += 2;
1717
1718                 rates = xrates = wme = htcap = htinfo = NULL;
1719                 vhtcap = vhtopmode = NULL;
1720                 while (efrm - frm > 1) {
1721                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1722                         switch (*frm) {
1723                         case IEEE80211_ELEMID_RATES:
1724                                 rates = frm;
1725                                 break;
1726                         case IEEE80211_ELEMID_XRATES:
1727                                 xrates = frm;
1728                                 break;
1729                         case IEEE80211_ELEMID_HTCAP:
1730                                 htcap = frm;
1731                                 break;
1732                         case IEEE80211_ELEMID_HTINFO:
1733                                 htinfo = frm;
1734                                 break;
1735                         case IEEE80211_ELEMID_VENDOR:
1736                                 if (iswmeoui(frm))
1737                                         wme = frm;
1738                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1739                                         /*
1740                                          * Accept pre-draft HT ie's if the
1741                                          * standard ones have not been seen.
1742                                          */
1743                                         if (ishtcapoui(frm)) {
1744                                                 if (htcap == NULL)
1745                                                         htcap = frm;
1746                                         } else if (ishtinfooui(frm)) {
1747                                                 if (htinfo == NULL)
1748                                                         htinfo = frm;
1749                                         }
1750                                 }
1751                                 /* XXX Atheros OUI support */
1752                                 break;
1753                         case IEEE80211_ELEMID_VHT_CAP:
1754                                 vhtcap = frm;
1755                                 break;
1756                         case IEEE80211_ELEMID_VHT_OPMODE:
1757                                 vhtopmode = frm;
1758                                 break;
1759                         }
1760                         frm += frm[1] + 2;
1761                 }
1762
1763                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1764                 if (xrates != NULL)
1765                         IEEE80211_VERIFY_ELEMENT(xrates,
1766                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1767                 rate = ieee80211_setup_rates(ni, rates, xrates,
1768                                 IEEE80211_F_JOIN |
1769                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1770                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1771                 if (rate & IEEE80211_RATE_BASIC) {
1772                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1773                             wh->i_addr2,
1774                             "%sassoc failed (rate set mismatch)",
1775                             ISREASSOC(subtype) ?  "re" : "");
1776                         vap->iv_stats.is_rx_assoc_norate++;
1777                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1778                             IEEE80211_SCAN_FAIL_STATUS);
1779                         return;
1780                 }
1781
1782                 ni->ni_capinfo = capinfo;
1783                 ni->ni_associd = associd;
1784                 if (ni->ni_jointime == 0)
1785                         ni->ni_jointime = time_uptime;
1786                 if (wme != NULL &&
1787                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1788                         ni->ni_flags |= IEEE80211_NODE_QOS;
1789                         ieee80211_wme_updateparams(vap);
1790                 } else
1791                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1792                 /*
1793                  * Setup HT state according to the negotiation.
1794                  *
1795                  * NB: shouldn't need to check if HT use is enabled but some
1796                  *     ap's send back HT ie's even when we don't indicate we
1797                  *     are HT capable in our AssocReq.
1798                  */
1799                 if (htcap != NULL && htinfo != NULL &&
1800                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1801                         ieee80211_ht_node_init(ni);
1802                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1803
1804                         if ((vhtcap != NULL) && (vhtopmode != NULL) &
1805                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1806                                 /*
1807                                  * Log if we get a VHT assoc/reassoc response.
1808                                  * We aren't ready for 2GHz VHT support.
1809                                  */
1810                                 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1811                                         printf("%s: peer %6D: VHT on 2GHz, ignoring\n",
1812                                             __func__,
1813                                             ni->ni_macaddr,
1814                                             ":");
1815                                 } else {
1816                                         ieee80211_vht_node_init(ni);
1817                                         ieee80211_vht_updateparams(ni, vhtcap, vhtopmode);
1818                                         ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode);
1819                                 }
1820                         }
1821
1822                         ieee80211_ht_updateparams_final(ni, htcap, htinfo);
1823                         ieee80211_setup_htrates(ni, htcap,
1824                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1825                         ieee80211_setup_basic_htrates(ni, htinfo);
1826
1827                         ieee80211_node_setuptxparms(ni);
1828                         ieee80211_ratectl_node_init(ni);
1829                 }
1830
1831                 /*
1832                  * Always initialise FF/superg state; we can use this
1833                  * for doing A-MSDU encapsulation as well.
1834                  */
1835 #ifdef  IEEE80211_SUPPORT_SUPERG
1836                 ieee80211_ff_node_init(ni);
1837 #endif
1838
1839                 /*
1840                  * Configure state now that we are associated.
1841                  *
1842                  * XXX may need different/additional driver callbacks?
1843                  */
1844                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1845                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1846                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1847                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1848                 } else {
1849                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1850                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1851                 }
1852                 ieee80211_set_shortslottime(ic,
1853                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1854                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1855                 /*
1856                  * Honor ERP protection.
1857                  *
1858                  * NB: ni_erp should zero for non-11g operation.
1859                  */
1860                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1861                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1862                         ic->ic_flags |= IEEE80211_F_USEPROT;
1863                 else
1864                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1865                 IEEE80211_NOTE_MAC(vap,
1866                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1867                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1868                     ISREASSOC(subtype) ? "re" : "",
1869                     IEEE80211_NODE_AID(ni),
1870                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1871                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1872                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1873                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1874                     ni->ni_flags & IEEE80211_NODE_HT ?
1875                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1876                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1877                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1878                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1879                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1880                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1881                         ", fast-frames" : "",
1882                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1883                         ", turbo" : ""
1884                 );
1885                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1886                 break;
1887         }
1888
1889         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1890                 uint16_t reason;
1891
1892                 if (vap->iv_state == IEEE80211_S_SCAN) {
1893                         vap->iv_stats.is_rx_mgtdiscard++;
1894                         return;
1895                 }
1896                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1897                         /* NB: can happen when in promiscuous mode */
1898                         vap->iv_stats.is_rx_mgtdiscard++;
1899                         break;
1900                 }
1901
1902                 /*
1903                  * deauth frame format
1904                  *      [2] reason
1905                  */
1906                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1907                 reason = le16toh(*(uint16_t *)frm);
1908
1909                 vap->iv_stats.is_rx_deauth++;
1910                 vap->iv_stats.is_rx_deauth_code = reason;
1911                 IEEE80211_NODE_STAT(ni, rx_deauth);
1912
1913                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1914                     "recv deauthenticate (reason: %d (%s))", reason,
1915                     ieee80211_reason_to_string(reason));
1916                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1917                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1918                 break;
1919         }
1920
1921         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1922                 uint16_t reason;
1923
1924                 if (vap->iv_state != IEEE80211_S_RUN &&
1925                     vap->iv_state != IEEE80211_S_ASSOC &&
1926                     vap->iv_state != IEEE80211_S_AUTH) {
1927                         vap->iv_stats.is_rx_mgtdiscard++;
1928                         return;
1929                 }
1930                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1931                         /* NB: can happen when in promiscuous mode */
1932                         vap->iv_stats.is_rx_mgtdiscard++;
1933                         break;
1934                 }
1935
1936                 /*
1937                  * disassoc frame format
1938                  *      [2] reason
1939                  */
1940                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1941                 reason = le16toh(*(uint16_t *)frm);
1942
1943                 vap->iv_stats.is_rx_disassoc++;
1944                 vap->iv_stats.is_rx_disassoc_code = reason;
1945                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1946
1947                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1948                     "recv disassociate (reason: %d (%s))", reason,
1949                     ieee80211_reason_to_string(reason));
1950                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1951                 break;
1952         }
1953
1954         case IEEE80211_FC0_SUBTYPE_ACTION:
1955         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1956                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
1957                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1958                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1959                             wh, NULL, "%s", "not for us");
1960                         vap->iv_stats.is_rx_mgtdiscard++;
1961                 } else if (vap->iv_state != IEEE80211_S_RUN) {
1962                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1963                             wh, NULL, "wrong state %s",
1964                             ieee80211_state_name[vap->iv_state]);
1965                         vap->iv_stats.is_rx_mgtdiscard++;
1966                 } else {
1967                         if (ieee80211_parse_action(ni, m0) == 0)
1968                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
1969                 }
1970                 break;
1971
1972         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1973         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1974         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1975         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1976         case IEEE80211_FC0_SUBTYPE_ATIM:
1977                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1978                     wh, NULL, "%s", "not handled");
1979                 vap->iv_stats.is_rx_mgtdiscard++;
1980                 break;
1981
1982         default:
1983                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1984                     wh, "mgt", "subtype 0x%x not handled", subtype);
1985                 vap->iv_stats.is_rx_badsubtype++;
1986                 break;
1987         }
1988 #undef ISREASSOC
1989 }
1990
1991 static void
1992 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1993 {
1994         switch (subtype) {
1995         case IEEE80211_FC0_SUBTYPE_BAR:
1996                 ieee80211_recv_bar(ni, m);
1997                 break;
1998         }
1999 }