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 = ieee80211_getqos(wh)[0];
 791                 else
 792                         qos = 0;
 793
 794                 /*
 795                  * Next up, any fragmentation.
 796                  */
 797                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 798                         m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
 799                         if (m == NULL) {
 800                                 /* Fragment dropped or frame not complete yet */
 801                                 goto out;
 802                         }
 803                 }
 804                 wh = NULL;              /* no longer valid, catch any uses */
 805
 806                 /*
 807                  * Next strip any MSDU crypto bits.
 808                  *
 809                  * Note: we can't do MIC stripping/verification if the
 810                  * upper layer has stripped it.  We have to check MIC
 811                  * ourselves.  So, key may be NULL, but we have to check
 812                  * the RX status.
 813                  */
 814                 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
 815                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 816                             ni->ni_macaddr, "data", "%s", "demic error");
 817                         vap->iv_stats.is_rx_demicfail++;
 818                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 819                         goto out;
 820                 }
 821
 822                 /* copy to listener after decrypt */
 823                 if (ieee80211_radiotap_active_vap(vap))
 824                         ieee80211_radiotap_rx(vap, m);
 825                 need_tap = 0;
 826
 827                 /*
 828                  * Finally, strip the 802.11 header.
 829                  */
 830                 m = ieee80211_decap(vap, m, hdrspace, qos);
 831                 if (m == NULL) {
 832                         /* XXX mask bit to check for both */
 833                         /* don't count Null data frames as errors */
 834                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 835                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 836                                 goto out;
 837                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 838                             ni->ni_macaddr, "data", "%s", "decap error");
 839                         vap->iv_stats.is_rx_decap++;
 840                         IEEE80211_NODE_STAT(ni, rx_decap);
 841                         goto err;
 842                 }
 843                 if (!(qos & IEEE80211_QOS_AMSDU))
 844                         eh = mtod(m, struct ether_header *);
 845                 else
 846                         eh = NULL;
 847                 if (!ieee80211_node_is_authorized(ni)) {
 848                         /*
 849                          * Deny any non-PAE frames received prior to
 850                          * authorization.  For open/shared-key
 851                          * authentication the port is mark authorized
 852                          * after authentication completes.  For 802.1x
 853                          * the port is not marked authorized by the
 854                          * authenticator until the handshake has completed.
 855                          */
 856                         if (eh == NULL ||
 857                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 858                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 859                                     ni->ni_macaddr, "data", "unauthorized or "
 860                                     "unknown port: ether type 0x%x len %u",
 861                                     eh == NULL ? -1 : eh->ether_type,
 862                                     m->m_pkthdr.len);
 863                                 vap->iv_stats.is_rx_unauth++;
 864                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 865                                 goto err;
 866                         }
 867                 } else {
 868                         /*
 869                          * When denying unencrypted frames, discard
 870                          * any non-PAE frames received without encryption.
 871                          */
 872                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 873                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 874                             (is_hw_decrypted == 0) &&
 875                             (eh == NULL ||
 876                              eh->ether_type != htons(ETHERTYPE_PAE))) {
 877                                 /*
 878                                  * Drop unencrypted frames.
 879                                  */
 880                                 vap->iv_stats.is_rx_unencrypted++;
 881                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 882                                 goto out;
 883                         }
 884                 }
 885                 /* XXX require HT? */
 886                 if (qos & IEEE80211_QOS_AMSDU) {
 887                         m = ieee80211_decap_amsdu(ni, m);
 888                         if (m == NULL)
 889                                 return IEEE80211_FC0_TYPE_DATA;
 890                 } else {
 891 #ifdef IEEE80211_SUPPORT_SUPERG
 892                         m = ieee80211_decap_fastframe(vap, ni, m);
 893                         if (m == NULL)
 894                                 return IEEE80211_FC0_TYPE_DATA;
 895 #endif
 896                 }
 897                 ieee80211_deliver_data(vap, ni, m);
 898                 return IEEE80211_FC0_TYPE_DATA;
 899
 900         case IEEE80211_FC0_TYPE_MGT:
 901                 vap->iv_stats.is_rx_mgmt++;
 902                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 903                 if (dir != IEEE80211_FC1_DIR_NODS) {
 904                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 905                             wh, "data", "incorrect dir 0x%x", dir);
 906                         vap->iv_stats.is_rx_wrongdir++;
 907                         goto err;
 908                 }
 909                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 910                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 911                             ni->ni_macaddr, "mgt", "too short: len %u",
 912                             m->m_pkthdr.len);
 913                         vap->iv_stats.is_rx_tooshort++;
 914                         goto out;
 915                 }
 916 #ifdef IEEE80211_DEBUG
 917                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 918                     ieee80211_msg_dumppkts(vap)) {
 919                         if_printf(ifp, "received %s from %s rssi %d\n",
 920                             ieee80211_mgt_subtype_name(subtype),
 921                             ether_sprintf(wh->i_addr2), rssi);
 922                 }
 923 #endif
 924
 925                 /*
 926                  * Note: See above for hardware offload privacy requirements.
 927                  *       It also applies here.
 928                  */
 929
 930                 /*
 931                  * Again, having encrypted flag set check would be good, but
 932                  * then we have to also handle crypto_decap() like above.
 933                  */
 934                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 935                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 936                                 /*
 937                                  * Only shared key auth frames with a challenge
 938                                  * should be encrypted, discard all others.
 939                                  */
 940                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 941                                     wh, ieee80211_mgt_subtype_name(subtype),
 942                                     "%s", "WEP set but not permitted");
 943                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 944                                 goto out;
 945                         }
 946                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 947                                 /*
 948                                  * Discard encrypted frames when privacy is off.
 949                                  */
 950                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 951                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 952                                 vap->iv_stats.is_rx_noprivacy++;
 953                                 goto out;
 954                         }
 955                         hdrspace = ieee80211_hdrspace(ic, wh);
 956
 957                         /*
 958                          * Again, if IV/MIC was stripped, then this whole
 959                          * setup will fail.  That's going to need some poking.
 960                          */
 961                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 962                                 /* NB: stats+msgs handled in crypto_decap */
 963                                 goto out;
 964                         }
 965                         has_decrypted = 1;
 966                         wh = mtod(m, struct ieee80211_frame *);
 967                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 968                 }
 969                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 970                 goto out;
 971
 972         case IEEE80211_FC0_TYPE_CTL:
 973                 vap->iv_stats.is_rx_ctl++;
 974                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 975                 vap->iv_recv_ctl(ni, m, subtype);
 976                 goto out;
 977
 978         default:
 979                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 980                     wh, NULL, "bad frame type 0x%x", type);
 981                 /* should not come here */
 982                 break;
 983         }
 984 err:
 985         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 986 out:
 987         if (m != NULL) {
 988                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 989                         ieee80211_radiotap_rx(vap, m);
 990                 m_freem(m);
 991         }
 992         return type;
 993 }
 994
 995 static void
 996 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 997     int rssi, int nf, uint16_t seq, uint16_t status)
 998 {
 999         struct ieee80211vap *vap = ni->ni_vap;
1000
1001         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
1002                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1003                     ni->ni_macaddr, "open auth",
1004                     "bad sta auth mode %u", ni->ni_authmode);
1005                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
1006                 return;
1007         }
1008         if (vap->iv_state != IEEE80211_S_AUTH ||
1009             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
1010                 vap->iv_stats.is_rx_bad_auth++;
1011                 return;
1012         }
1013         if (status != 0) {
1014                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1015                     ni, "open auth failed (reason %d)", status);
1016                 vap->iv_stats.is_rx_auth_fail++;
1017                 vap->iv_stats.is_rx_authfail_code = status;
1018                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1019                     IEEE80211_SCAN_FAIL_STATUS);
1020         } else
1021                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1022 }
1023
1024 static void
1025 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1026     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1027     uint16_t seq, uint16_t status)
1028 {
1029         struct ieee80211vap *vap = ni->ni_vap;
1030         uint8_t *challenge;
1031
1032         /*
1033          * NB: this can happen as we allow pre-shared key
1034          * authentication to be enabled w/o wep being turned
1035          * on so that configuration of these can be done
1036          * in any order.  It may be better to enforce the
1037          * ordering in which case this check would just be
1038          * for sanity/consistency.
1039          */
1040         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1041                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1042                     ni->ni_macaddr, "shared key auth",
1043                     "%s", " PRIVACY is disabled");
1044                 goto bad;
1045         }
1046         /*
1047          * Pre-shared key authentication is evil; accept
1048          * it only if explicitly configured (it is supported
1049          * mainly for compatibility with clients like OS X).
1050          */
1051         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1052             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1053                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1054                     ni->ni_macaddr, "shared key auth",
1055                     "bad sta auth mode %u", ni->ni_authmode);
1056                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1057                 goto bad;
1058         }
1059
1060         challenge = NULL;
1061         if (frm + 1 < efrm) {
1062                 if ((frm[1] + 2) > (efrm - frm)) {
1063                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1064                             ni->ni_macaddr, "shared key auth",
1065                             "ie %d/%d too long",
1066                             frm[0], (frm[1] + 2) - (efrm - frm));
1067                         vap->iv_stats.is_rx_bad_auth++;
1068                         goto bad;
1069                 }
1070                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1071                         challenge = frm;
1072                 frm += frm[1] + 2;
1073         }
1074         switch (seq) {
1075         case IEEE80211_AUTH_SHARED_CHALLENGE:
1076         case IEEE80211_AUTH_SHARED_RESPONSE:
1077                 if (challenge == NULL) {
1078                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1079                             ni->ni_macaddr, "shared key auth",
1080                             "%s", "no challenge");
1081                         vap->iv_stats.is_rx_bad_auth++;
1082                         goto bad;
1083                 }
1084                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1085                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1086                             ni->ni_macaddr, "shared key auth",
1087                             "bad challenge len %d", challenge[1]);
1088                         vap->iv_stats.is_rx_bad_auth++;
1089                         goto bad;
1090                 }
1091         default:
1092                 break;
1093         }
1094         if (vap->iv_state != IEEE80211_S_AUTH)
1095                 return;
1096         switch (seq) {
1097         case IEEE80211_AUTH_SHARED_PASS:
1098                 if (ni->ni_challenge != NULL) {
1099                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1100                         ni->ni_challenge = NULL;
1101                 }
1102                 if (status != 0) {
1103                         IEEE80211_NOTE_FRAME(vap,
1104                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1105                             "shared key auth failed (reason %d)", status);
1106                         vap->iv_stats.is_rx_auth_fail++;
1107                         vap->iv_stats.is_rx_authfail_code = status;
1108                         return;
1109                 }
1110                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1111                 break;
1112         case IEEE80211_AUTH_SHARED_CHALLENGE:
1113                 if (!ieee80211_alloc_challenge(ni))
1114                         return;
1115                 /* XXX could optimize by passing recvd challenge */
1116                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1117                 IEEE80211_SEND_MGMT(ni,
1118                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1119                 break;
1120         default:
1121                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1122                     wh, "shared key auth", "bad seq %d", seq);
1123                 vap->iv_stats.is_rx_bad_auth++;
1124                 return;
1125         }
1126         return;
1127 bad:
1128         /*
1129          * Kick the state machine.  This short-circuits
1130          * using the mgt frame timeout to trigger the
1131          * state transition.
1132          */
1133         if (vap->iv_state == IEEE80211_S_AUTH)
1134                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1135                     IEEE80211_SCAN_FAIL_STATUS);
1136 }
1137
1138 /*
1139  * Parse the WME IE for QoS and U-APSD information.
1140  *
1141  * Returns -1 if the IE isn't found, 1 if it's found.
1142  */
1143 int
1144 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh,
1145     struct ieee80211_node *ni)
1146 {
1147         u_int len = frm[1];
1148
1149         ni->ni_uapsd = 0;
1150
1151         if (len < sizeof(struct ieee80211_wme_param)-2) {
1152                 IEEE80211_DISCARD_IE(ni->ni_vap,
1153                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1154                     wh, "WME", "too short, len %u", len);
1155                 return -1;
1156         }
1157
1158         ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET];
1159
1160         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC,
1161             ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd);
1162
1163         return 1;
1164 }
1165
1166 int
1167 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1168         const struct ieee80211_frame *wh, uint8_t *qosinfo)
1169 {
1170 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1171         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1172         u_int len = frm[1], qosinfo_count;
1173         int i;
1174
1175         *qosinfo = 0;
1176
1177         if (len < sizeof(struct ieee80211_wme_param)-2) {
1178                 IEEE80211_DISCARD_IE(vap,
1179                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1180                     wh, "WME", "too short, len %u", len);
1181                 return -1;
1182         }
1183         *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1184         qosinfo_count = *qosinfo & WME_QOSINFO_COUNT;
1185
1186         /* XXX do proper check for wraparound */
1187         if (qosinfo_count == wme->wme_wmeChanParams.cap_info)
1188                 return 0;
1189         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1190         for (i = 0; i < WME_NUM_AC; i++) {
1191                 struct wmeParams *wmep =
1192                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1193                 /* NB: ACI not used */
1194                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1195                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1196                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1197                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1198                 wmep->wmep_txopLimit = le16dec(frm+2);
1199                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
1200                     "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n",
1201                     __func__,
1202                     i,
1203                     wmep->wmep_acm,
1204                     wmep->wmep_aifsn,
1205                     wmep->wmep_logcwmin,
1206                     wmep->wmep_logcwmax,
1207                     wmep->wmep_txopLimit);
1208                 frm += 4;
1209         }
1210         wme->wme_wmeChanParams.cap_info = qosinfo_count;
1211         return 1;
1212 #undef MS
1213 }
1214
1215 /*
1216  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1217  * is the first CSA then initiate the switch.  Otherwise we
1218  * track state and trigger completion and/or cancel of the switch.
1219  * XXX should be public for IBSS use
1220  */
1221 static void
1222 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1223         const struct ieee80211_frame *wh)
1224 {
1225         struct ieee80211com *ic = vap->iv_ic;
1226         const struct ieee80211_csa_ie *csa =
1227             (const struct ieee80211_csa_ie *) frm;
1228
1229         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1230             ("state %s", ieee80211_state_name[vap->iv_state]));
1231
1232         if (csa->csa_mode > 1) {
1233                 IEEE80211_DISCARD_IE(vap,
1234                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1235                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1236                 return;
1237         }
1238         IEEE80211_LOCK(ic);
1239         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1240                 /*
1241                  * Convert the channel number to a channel reference.  We
1242                  * try first to preserve turbo attribute of the current
1243                  * channel then fallback.  Note this will not work if the
1244                  * CSA specifies a channel that requires a band switch (e.g.
1245                  * 11a => 11g).  This is intentional as 11h is defined only
1246                  * for 5GHz/11a and because the switch does not involve a
1247                  * reassociation, protocol state (capabilities, negotated
1248                  * rates, etc) may/will be wrong.
1249                  */
1250                 struct ieee80211_channel *c =
1251                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1252                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1253                 if (c == NULL) {
1254                         c = ieee80211_find_channel_byieee(ic,
1255                             csa->csa_newchan,
1256                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1257                         if (c == NULL) {
1258                                 IEEE80211_DISCARD_IE(vap,
1259                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1260                                     wh, "CSA", "invalid channel %u",
1261                                     csa->csa_newchan);
1262                                 goto done;
1263                         }
1264                 }
1265 #if IEEE80211_CSA_COUNT_MIN > 0
1266                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1267                         /*
1268                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1269                          * reduce the risk of being redirected by a fabricated
1270                          * CSA.  If a valid CSA is dropped we'll still get a
1271                          * beacon miss when the AP leaves the channel so we'll
1272                          * eventually follow to the new channel.
1273                          *
1274                          * NOTE: this violates the 11h spec that states that
1275                          * count may be any value and if 0 then a switch
1276                          * should happen asap.
1277                          */
1278                         IEEE80211_DISCARD_IE(vap,
1279                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1280                             wh, "CSA", "count %u too small, must be >= %u",
1281                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1282                         goto done;
1283                 }
1284 #endif
1285                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1286         } else {
1287                 /*
1288                  * Validate this ie against the initial CSA.  We require
1289                  * mode and channel not change and the count must be
1290                  * monotonically decreasing.  This may be pointless and
1291                  * canceling the switch as a result may be too paranoid but
1292                  * in the worst case if we drop out of CSA because of this
1293                  * and the AP does move then we'll just end up taking a
1294                  * beacon miss and scan to find the AP.
1295                  *
1296                  * XXX may want <= on count as we also process ProbeResp
1297                  * frames and those may come in w/ the same count as the
1298                  * previous beacon; but doing so leaves us open to a stuck
1299                  * count until we add a dead-man timer
1300                  */
1301                 if (!(csa->csa_count < ic->ic_csa_count &&
1302                       csa->csa_mode == ic->ic_csa_mode &&
1303                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1304                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1305                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1306                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1307                             ic->ic_csa_newchan, ic->ic_csa_count,
1308                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1309                         ieee80211_csa_cancelswitch(ic);
1310                 } else {
1311                         if (csa->csa_count <= 1)
1312                                 ieee80211_csa_completeswitch(ic);
1313                         else
1314                                 ic->ic_csa_count = csa->csa_count;
1315                 }
1316         }
1317 done:
1318         IEEE80211_UNLOCK(ic);
1319 }
1320
1321 /*
1322  * Return non-zero if a background scan may be continued:
1323  * o bg scan is active
1324  * o no channel switch is pending
1325  * o there has not been any traffic recently
1326  * o no full-offload scan support (no need for explicitly continuing scan then)
1327  *
1328  * Note we do not check if there is an administrative enable;
1329  * this is only done to start the scan.  We assume that any
1330  * change in state will be accompanied by a request to cancel
1331  * active scans which will otherwise cause this test to fail.
1332  */
1333 static __inline int
1334 contbgscan(struct ieee80211vap *vap)
1335 {
1336         struct ieee80211com *ic = vap->iv_ic;
1337
1338         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1339             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1340             !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) &&
1341             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1342             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1343 }
1344
1345 /*
1346  * Return non-zero if a backgrond scan may be started:
1347  * o bg scanning is administratively enabled
1348  * o no channel switch is pending
1349  * o we are not boosted on a dynamic turbo channel
1350  * o there has not been a scan recently
1351  * o there has not been any traffic recently (don't check if full-offload scan)
1352  */
1353 static __inline int
1354 startbgscan(struct ieee80211vap *vap)
1355 {
1356         struct ieee80211com *ic = vap->iv_ic;
1357
1358         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1359             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1360 #ifdef IEEE80211_SUPPORT_SUPERG
1361             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1362 #endif
1363             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1364             ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) ||
1365              ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)));
1366 }
1367
1368 #ifdef  notyet
1369 /*
1370  * Compare two quiet IEs and return if they are equivalent.
1371  *
1372  * The tbttcount isnt checked - that's not part of the configuration.
1373  */
1374 static int
1375 compare_quiet_ie(const struct ieee80211_quiet_ie *q1,
1376     const struct ieee80211_quiet_ie *q2)
1377 {
1378
1379         if (q1->period != q2->period)
1380                 return (0);
1381         if (le16dec(&q1->duration) != le16dec(&q2->duration))
1382                 return (0);
1383         if (le16dec(&q1->offset) != le16dec(&q2->offset))
1384                 return (0);
1385         return (1);
1386 }
1387 #endif
1388
1389 static void
1390 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1391     const struct ieee80211_rx_stats *rxs,
1392     int rssi, int nf)
1393 {
1394 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1395         struct ieee80211vap *vap = ni->ni_vap;
1396         struct ieee80211com *ic = ni->ni_ic;
1397         struct ieee80211_channel *rxchan = ic->ic_curchan;
1398         struct ieee80211_frame *wh;
1399         int ht_state_change = 0, do_ht = 0;
1400         uint8_t *frm, *efrm;
1401         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1402         uint8_t *vhtcap, *vhtopmode;
1403         uint8_t rate;
1404         uint8_t qosinfo;
1405
1406         wh = mtod(m0, struct ieee80211_frame *);
1407         frm = (uint8_t *)&wh[1];
1408         efrm = mtod(m0, uint8_t *) + m0->m_len;
1409         switch (subtype) {
1410         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1411         case IEEE80211_FC0_SUBTYPE_BEACON: {
1412                 struct ieee80211_scanparams scan;
1413                 struct ieee80211_channel *c;
1414                 /*
1415                  * We process beacon/probe response frames:
1416                  *    o when scanning, or
1417                  *    o station mode when associated (to collect state
1418                  *      updates such as 802.11g slot time)
1419                  * Frames otherwise received are discarded.
1420                  */
1421                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1422                         vap->iv_stats.is_rx_mgtdiscard++;
1423                         return;
1424                 }
1425
1426                 /* Override RX channel as appropriate */
1427                 if (rxs != NULL) {
1428                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1429                         if (c != NULL)
1430                                 rxchan = c;
1431                 }
1432
1433                 /* XXX probe response in sta mode when !scanning? */
1434                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1435                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1436                                 vap->iv_stats.is_beacon_bad++;
1437                         return;
1438                 }
1439
1440                 /*
1441                  * Count frame now that we know it's to be processed.
1442                  */
1443                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1444                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1445                         IEEE80211_NODE_STAT(ni, rx_beacons);
1446                 } else
1447                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1448                 /*
1449                  * When operating in station mode, check for state updates.
1450                  * Be careful to ignore beacons received while doing a
1451                  * background scan.  We consider only 11g/WMM stuff right now.
1452                  */
1453                 if (ni->ni_associd != 0 &&
1454                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1455                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1456                         /* record tsf of last beacon */
1457                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1458                                 sizeof(ni->ni_tstamp));
1459                         /* count beacon frame for s/w bmiss handling */
1460                         vap->iv_swbmiss_count++;
1461                         vap->iv_bmiss_count = 0;
1462                         if (ni->ni_erp != scan.erp) {
1463                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1464                                     wh->i_addr2,
1465                                     "erp change: was 0x%x, now 0x%x",
1466                                     ni->ni_erp, scan.erp);
1467                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1468                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1469                                         vap->iv_flags |= IEEE80211_F_USEPROT;
1470                                 else
1471                                         vap->iv_flags &= ~IEEE80211_F_USEPROT;
1472                                 ni->ni_erp = scan.erp;
1473                                 /* XXX statistic */
1474                                 /* driver notification */
1475                                 ieee80211_vap_update_erp_protmode(vap);
1476                         }
1477                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1478                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1479                                     wh->i_addr2,
1480                                     "capabilities change: was 0x%x, now 0x%x",
1481                                     ni->ni_capinfo, scan.capinfo);
1482                                 /*
1483                                  * NB: we assume short preamble doesn't
1484                                  *     change dynamically
1485                                  */
1486                                 ieee80211_vap_set_shortslottime(vap,
1487                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1488                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1489                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1490                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1491                                 /* XXX statistic */
1492                         }
1493                         if (scan.wme != NULL &&
1494                             (ni->ni_flags & IEEE80211_NODE_QOS)) {
1495                                 int _retval;
1496                                 if ((_retval = ieee80211_parse_wmeparams(vap,
1497                                     scan.wme, wh, &qosinfo)) >= 0) {
1498                                         if (qosinfo & WME_CAPINFO_UAPSD_EN)
1499                                                 ni->ni_flags |=
1500                                                     IEEE80211_NODE_UAPSD;
1501                                         if (_retval > 0)
1502                                                 ieee80211_wme_updateparams(vap);
1503                                 }
1504                         } else
1505                                 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
1506 #ifdef IEEE80211_SUPPORT_SUPERG
1507                         if (scan.ath != NULL)
1508                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1509 #endif
1510                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1511                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1512                                 /* XXX state changes? */
1513                                 ieee80211_ht_updateparams(ni,
1514                                     scan.htcap, scan.htinfo);
1515                                 do_ht = 1;
1516                         }
1517                         if (scan.vhtcap != NULL && scan.vhtopmode != NULL &&
1518                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1519                                 /* XXX state changes? */
1520                                 ieee80211_vht_updateparams(ni,
1521                                     scan.vhtcap, scan.vhtopmode);
1522                                 do_ht = 1;
1523                         }
1524                         if (do_ht) {
1525                                 if (ieee80211_ht_updateparams_final(ni,
1526                                     scan.htcap, scan.htinfo))
1527                                         ht_state_change = 1;
1528                         }
1529
1530                         /*
1531                          * If we have a quiet time IE then report it up to
1532                          * the driver.
1533                          *
1534                          * Otherwise, inform the driver that the quiet time
1535                          * IE has disappeared - only do that once rather than
1536                          * spamming it each time.
1537                          */
1538                         if (scan.quiet) {
1539                                 ic->ic_set_quiet(ni, scan.quiet);
1540                                 ni->ni_quiet_ie_set = 1;
1541                                 memcpy(&ni->ni_quiet_ie, scan.quiet,
1542                                     sizeof(struct ieee80211_quiet_ie));
1543                         } else {
1544                                 if (ni->ni_quiet_ie_set == 1)
1545                                         ic->ic_set_quiet(ni, NULL);
1546                                 ni->ni_quiet_ie_set = 0;
1547                                 bzero(&ni->ni_quiet_ie,
1548                                     sizeof(struct ieee80211_quiet_ie));
1549                         }
1550
1551                         if (scan.tim != NULL) {
1552                                 struct ieee80211_tim_ie *tim =
1553                                     (struct ieee80211_tim_ie *) scan.tim;
1554                                 /*
1555                                  * XXX Check/debug this code; see if it's about
1556                                  * the right time to force the VAP awake if we
1557                                  * receive a frame destined for us?
1558                                  */
1559                                 int aid = IEEE80211_AID(ni->ni_associd);
1560                                 int ix = aid / NBBY;
1561                                 int min = tim->tim_bitctl &~ 1;
1562                                 int max = tim->tim_len + min - 4;
1563                                 int tim_ucast = 0, tim_mcast = 0;
1564
1565                                 /*
1566                                  * Only do this for unicast traffic in the TIM
1567                                  * The multicast traffic notification for
1568                                  * the scan notification stuff should occur
1569                                  * differently.
1570                                  */
1571                                 if (min <= ix && ix <= max &&
1572                                      isset(tim->tim_bitmap - min, aid)) {
1573                                         tim_ucast = 1;
1574                                 }
1575
1576                                 /*
1577                                  * Do a separate notification
1578                                  * for the multicast bit being set.
1579                                  */
1580                                 if (tim->tim_bitctl & 1) {
1581                                         tim_mcast = 1;
1582                                 }
1583
1584                                 /*
1585                                  * If the TIM indicates there's traffic for
1586                                  * us then get us out of STA mode powersave.
1587                                  */
1588                                 if (tim_ucast == 1) {
1589
1590                                         /*
1591                                          * Wake us out of SLEEP state if we're
1592                                          * in it; and if we're doing bgscan
1593                                          * then wake us out of STA powersave.
1594                                          */
1595                                         ieee80211_sta_tim_notify(vap, 1);
1596
1597                                         /*
1598                                          * This is preventing us from
1599                                          * continuing a bgscan; because it
1600                                          * tricks the contbgscan()
1601                                          * routine to think there's always
1602                                          * traffic for us.
1603                                          *
1604                                          * I think we need both an RX and
1605                                          * TX ic_lastdata field.
1606                                          */
1607                                         ic->ic_lastdata = ticks;
1608                                 }
1609
1610                                 ni->ni_dtim_count = tim->tim_count;
1611                                 ni->ni_dtim_period = tim->tim_period;
1612                         }
1613                         if (scan.csa != NULL &&
1614                             (vap->iv_flags & IEEE80211_F_DOTH))
1615                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1616                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1617                                 /*
1618                                  * No CSA ie or 11h disabled, but a channel
1619                                  * switch is pending; drop out so we aren't
1620                                  * stuck in CSA state.  If the AP really is
1621                                  * moving we'll get a beacon miss and scan.
1622                                  */
1623                                 IEEE80211_LOCK(ic);
1624                                 ieee80211_csa_cancelswitch(ic);
1625                                 IEEE80211_UNLOCK(ic);
1626                         }
1627                         /*
1628                          * If scanning, pass the info to the scan module.
1629                          * Otherwise, check if it's the right time to do
1630                          * a background scan.  Background scanning must
1631                          * be enabled and we must not be operating in the
1632                          * turbo phase of dynamic turbo mode.  Then,
1633                          * it's been a while since the last background
1634                          * scan and if no data frames have come through
1635                          * recently, kick off a scan.  Note that this
1636                          * is the mechanism by which a background scan
1637                          * is started _and_ continued each time we
1638                          * return on-channel to receive a beacon from
1639                          * our ap.
1640                          */
1641                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1642                                 ieee80211_add_scan(vap, rxchan,
1643                                     &scan, wh, subtype, rssi, nf);
1644                         } else if (contbgscan(vap)) {
1645                                 ieee80211_bg_scan(vap, 0);
1646                         } else if (startbgscan(vap)) {
1647                                 vap->iv_stats.is_scan_bg++;
1648 #if 0
1649                                 /* wakeup if we are sleeing */
1650                                 ieee80211_set_pwrsave(vap, 0);
1651 #endif
1652                                 ieee80211_bg_scan(vap, 0);
1653                         }
1654
1655                         /*
1656                          * Put the station to sleep if we haven't seen
1657                          * traffic in a while.
1658                          */
1659                         IEEE80211_LOCK(ic);
1660                         ieee80211_sta_ps_timer_check(vap);
1661                         IEEE80211_UNLOCK(ic);
1662
1663                         /*
1664                          * If we've had a channel width change (eg HT20<->HT40)
1665                          * then schedule a delayed driver notification.
1666                          */
1667                         if (ht_state_change)
1668                                 ieee80211_update_chw(ic);
1669                         return;
1670                 }
1671                 /*
1672                  * If scanning, just pass information to the scan module.
1673                  */
1674                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1675                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1676                                 /*
1677                                  * Actively scanning a channel marked passive;
1678                                  * send a probe request now that we know there
1679                                  * is 802.11 traffic present.
1680                                  *
1681                                  * XXX check if the beacon we recv'd gives
1682                                  * us what we need and suppress the probe req
1683                                  */
1684                                 ieee80211_probe_curchan(vap, 1);
1685                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1686                         }
1687                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1688                             subtype, rssi, nf);
1689                         return;
1690                 }
1691                 break;
1692         }
1693
1694         case IEEE80211_FC0_SUBTYPE_AUTH: {
1695                 uint16_t algo, seq, status;
1696                 /*
1697                  * auth frame format
1698                  *      [2] algorithm
1699                  *      [2] sequence
1700                  *      [2] status
1701                  *      [tlv*] challenge
1702                  */
1703                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1704                 algo   = le16toh(*(uint16_t *)frm);
1705                 seq    = le16toh(*(uint16_t *)(frm + 2));
1706                 status = le16toh(*(uint16_t *)(frm + 4));
1707                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1708                     "recv auth frame with algorithm %d seq %d", algo, seq);
1709
1710                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1711                         IEEE80211_DISCARD(vap,
1712                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1713                             wh, "auth", "%s", "TKIP countermeasures enabled");
1714                         vap->iv_stats.is_rx_auth_countermeasures++;
1715                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1716                                 ieee80211_send_error(ni, wh->i_addr2,
1717                                         IEEE80211_FC0_SUBTYPE_AUTH,
1718                                         IEEE80211_REASON_MIC_FAILURE);
1719                         }
1720                         return;
1721                 }
1722                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1723                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1724                             seq, status);
1725                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1726                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1727                 else {
1728                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1729                             wh, "auth", "unsupported alg %d", algo);
1730                         vap->iv_stats.is_rx_auth_unsupported++;
1731                         return;
1732                 }
1733                 break;
1734         }
1735
1736         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1737         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1738                 uint16_t capinfo, associd;
1739                 uint16_t status;
1740
1741                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1742                         vap->iv_stats.is_rx_mgtdiscard++;
1743                         return;
1744                 }
1745
1746                 /*
1747                  * asresp frame format
1748                  *      [2] capability information
1749                  *      [2] status
1750                  *      [2] association ID
1751                  *      [tlv] supported rates
1752                  *      [tlv] extended supported rates
1753                  *      [tlv] WME
1754                  *      [tlv] HT capabilities
1755                  *      [tlv] HT info
1756                  */
1757                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1758                 ni = vap->iv_bss;
1759                 capinfo = le16toh(*(uint16_t *)frm);
1760                 frm += 2;
1761                 status = le16toh(*(uint16_t *)frm);
1762                 frm += 2;
1763                 if (status != 0) {
1764                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1765                             wh->i_addr2, "%sassoc failed (reason %d)",
1766                             ISREASSOC(subtype) ?  "re" : "", status);
1767                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1768                         return;
1769                 }
1770                 associd = le16toh(*(uint16_t *)frm);
1771                 frm += 2;
1772
1773                 rates = xrates = wme = htcap = htinfo = NULL;
1774                 vhtcap = vhtopmode = NULL;
1775                 while (efrm - frm > 1) {
1776                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1777                         switch (*frm) {
1778                         case IEEE80211_ELEMID_RATES:
1779                                 rates = frm;
1780                                 break;
1781                         case IEEE80211_ELEMID_XRATES:
1782                                 xrates = frm;
1783                                 break;
1784                         case IEEE80211_ELEMID_HTCAP:
1785                                 htcap = frm;
1786                                 break;
1787                         case IEEE80211_ELEMID_HTINFO:
1788                                 htinfo = frm;
1789                                 break;
1790                         case IEEE80211_ELEMID_VENDOR:
1791                                 if (iswmeoui(frm))
1792                                         wme = frm;
1793                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1794                                         /*
1795                                          * Accept pre-draft HT ie's if the
1796                                          * standard ones have not been seen.
1797                                          */
1798                                         if (ishtcapoui(frm)) {
1799                                                 if (htcap == NULL)
1800                                                         htcap = frm;
1801                                         } else if (ishtinfooui(frm)) {
1802                                                 if (htinfo == NULL)
1803                                                         htinfo = frm;
1804                                         }
1805                                 }
1806                                 /* XXX Atheros OUI support */
1807                                 break;
1808                         case IEEE80211_ELEMID_VHT_CAP:
1809                                 vhtcap = frm;
1810                                 break;
1811                         case IEEE80211_ELEMID_VHT_OPMODE:
1812                                 vhtopmode = frm;
1813                                 break;
1814                         }
1815                         frm += frm[1] + 2;
1816                 }
1817
1818                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1819                 if (xrates != NULL)
1820                         IEEE80211_VERIFY_ELEMENT(xrates,
1821                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1822                 rate = ieee80211_setup_rates(ni, rates, xrates,
1823                                 IEEE80211_F_JOIN |
1824                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1825                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1826                 if (rate & IEEE80211_RATE_BASIC) {
1827                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1828                             wh->i_addr2,
1829                             "%sassoc failed (rate set mismatch)",
1830                             ISREASSOC(subtype) ?  "re" : "");
1831                         vap->iv_stats.is_rx_assoc_norate++;
1832                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1833                             IEEE80211_SCAN_FAIL_STATUS);
1834                         return;
1835                 }
1836
1837                 ni->ni_capinfo = capinfo;
1838                 ni->ni_associd = associd;
1839                 if (ni->ni_jointime == 0)
1840                         ni->ni_jointime = time_uptime;
1841                 if (wme != NULL &&
1842                     ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) {
1843                         ni->ni_flags |= IEEE80211_NODE_QOS;
1844                         ieee80211_wme_updateparams(vap);
1845                 } else
1846                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1847                 /*
1848                  * Setup HT state according to the negotiation.
1849                  *
1850                  * NB: shouldn't need to check if HT use is enabled but some
1851                  *     ap's send back HT ie's even when we don't indicate we
1852                  *     are HT capable in our AssocReq.
1853                  */
1854                 if (htcap != NULL && htinfo != NULL &&
1855                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1856                         ieee80211_ht_node_init(ni);
1857                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1858
1859                         if ((vhtcap != NULL) && (vhtopmode != NULL) &
1860                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1861                                 /*
1862                                  * Log if we get a VHT assoc/reassoc response.
1863                                  * We aren't ready for 2GHz VHT support.
1864                                  */
1865                                 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1866                                         printf("%s: peer %6D: VHT on 2GHz, ignoring\n",
1867                                             __func__,
1868                                             ni->ni_macaddr,
1869                                             ":");
1870                                 } else {
1871                                         ieee80211_vht_node_init(ni);
1872                                         ieee80211_vht_updateparams(ni, vhtcap, vhtopmode);
1873                                         ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode);
1874                                 }
1875                         }
1876
1877                         ieee80211_ht_updateparams_final(ni, htcap, htinfo);
1878                         ieee80211_setup_htrates(ni, htcap,
1879                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1880                         ieee80211_setup_basic_htrates(ni, htinfo);
1881
1882                         ieee80211_node_setuptxparms(ni);
1883                         ieee80211_ratectl_node_init(ni);
1884                 }
1885
1886                 /*
1887                  * Always initialise FF/superg state; we can use this
1888                  * for doing A-MSDU encapsulation as well.
1889                  */
1890 #ifdef  IEEE80211_SUPPORT_SUPERG
1891                 ieee80211_ff_node_init(ni);
1892 #endif
1893
1894                 /*
1895                  * Configure state now that we are associated.
1896                  *
1897                  * XXX may need different/additional driver callbacks?
1898                  */
1899                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1900                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1901                         vap->iv_flags |= IEEE80211_F_SHPREAMBLE;
1902                         vap->iv_flags &= ~IEEE80211_F_USEBARKER;
1903                 } else {
1904                         vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE;
1905                         vap->iv_flags |= IEEE80211_F_USEBARKER;
1906                 }
1907                 ieee80211_vap_set_shortslottime(vap,
1908                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1909                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1910                 ieee80211_vap_update_preamble(vap);
1911                 /*
1912                  * Honor ERP protection.
1913                  *
1914                  * NB: ni_erp should zero for non-11g operation.
1915                  */
1916                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1917                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1918                         vap->iv_flags |= IEEE80211_F_USEPROT;
1919                 else
1920                         vap->iv_flags &= ~IEEE80211_F_USEPROT;
1921                 ieee80211_vap_update_erp_protmode(vap);
1922                 IEEE80211_NOTE_MAC(vap,
1923                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1924                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s",
1925                     ISREASSOC(subtype) ? "re" : "",
1926                     IEEE80211_NODE_AID(ni),
1927                     vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1928                     vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1929                     vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1930                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1931                     ni->ni_flags & IEEE80211_NODE_HT ?
1932                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1933                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1934                     ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "",
1935                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1936                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1937                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1938                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1939                         ", fast-frames" : "",
1940                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1941                         ", turbo" : ""
1942                 );
1943                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1944                 break;
1945         }
1946
1947         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1948                 uint16_t reason;
1949
1950                 if (vap->iv_state == IEEE80211_S_SCAN) {
1951                         vap->iv_stats.is_rx_mgtdiscard++;
1952                         return;
1953                 }
1954                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1955                         /* NB: can happen when in promiscuous mode */
1956                         vap->iv_stats.is_rx_mgtdiscard++;
1957                         break;
1958                 }
1959
1960                 /*
1961                  * deauth frame format
1962                  *      [2] reason
1963                  */
1964                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1965                 reason = le16toh(*(uint16_t *)frm);
1966
1967                 vap->iv_stats.is_rx_deauth++;
1968                 vap->iv_stats.is_rx_deauth_code = reason;
1969                 IEEE80211_NODE_STAT(ni, rx_deauth);
1970
1971                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1972                     "recv deauthenticate (reason: %d (%s))", reason,
1973                     ieee80211_reason_to_string(reason));
1974                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1975                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1976                 break;
1977         }
1978
1979         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1980                 uint16_t reason;
1981
1982                 if (vap->iv_state != IEEE80211_S_RUN &&
1983                     vap->iv_state != IEEE80211_S_ASSOC &&
1984                     vap->iv_state != IEEE80211_S_AUTH) {
1985                         vap->iv_stats.is_rx_mgtdiscard++;
1986                         return;
1987                 }
1988                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1989                         /* NB: can happen when in promiscuous mode */
1990                         vap->iv_stats.is_rx_mgtdiscard++;
1991                         break;
1992                 }
1993
1994                 /*
1995                  * disassoc frame format
1996                  *      [2] reason
1997                  */
1998                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1999                 reason = le16toh(*(uint16_t *)frm);
2000
2001                 vap->iv_stats.is_rx_disassoc++;
2002                 vap->iv_stats.is_rx_disassoc_code = reason;
2003                 IEEE80211_NODE_STAT(ni, rx_disassoc);
2004
2005                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2006                     "recv disassociate (reason: %d (%s))", reason,
2007                     ieee80211_reason_to_string(reason));
2008                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
2009                 break;
2010         }
2011
2012         case IEEE80211_FC0_SUBTYPE_ACTION:
2013         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2014                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2015                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2016                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2017                             wh, NULL, "%s", "not for us");
2018                         vap->iv_stats.is_rx_mgtdiscard++;
2019                 } else if (vap->iv_state != IEEE80211_S_RUN) {
2020                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2021                             wh, NULL, "wrong state %s",
2022                             ieee80211_state_name[vap->iv_state]);
2023                         vap->iv_stats.is_rx_mgtdiscard++;
2024                 } else {
2025                         if (ieee80211_parse_action(ni, m0) == 0)
2026                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2027                 }
2028                 break;
2029
2030         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2031         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2032         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
2033         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2034         case IEEE80211_FC0_SUBTYPE_ATIM:
2035                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2036                     wh, NULL, "%s", "not handled");
2037                 vap->iv_stats.is_rx_mgtdiscard++;
2038                 break;
2039
2040         default:
2041                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2042                     wh, "mgt", "subtype 0x%x not handled", subtype);
2043                 vap->iv_stats.is_rx_badsubtype++;
2044                 break;
2045         }
2046 #undef ISREASSOC
2047 }
2048
2049 static void
2050 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2051 {
2052         switch (subtype) {
2053         case IEEE80211_FC0_SUBTYPE_BAR:
2054                 ieee80211_recv_bar(ni, m);
2055                 break;
2056         }
2057 }