sys/net80211/ieee80211_sta.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   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 /*
  29  * IEEE 802.11 Station mode support.
  30  */
  31 #include "opt_inet.h"
  32 #include "opt_wlan.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/malloc.h>
  38 #include <sys/kernel.h>
  39
  40 #include <sys/socket.h>
  41 #include <sys/sockio.h>
  42 #include <sys/endian.h>
  43 #include <sys/errno.h>
  44 #include <sys/proc.h>
  45 #include <sys/sysctl.h>
  46
  47 #include <net/if.h>
  48 #include <net/if_media.h>
  49 #include <net/if_llc.h>
  50 #include <net/if_dl.h>
  51 #include <net/if_var.h>
  52 #include <net/if_private.h>
  53 #include <net/ethernet.h>
  54
  55 #include <net/bpf.h>
  56
  57 #include <net80211/ieee80211_var.h>
  58 #include <net80211/ieee80211_sta.h>
  59 #include <net80211/ieee80211_input.h>
  60 #ifdef IEEE80211_SUPPORT_SUPERG
  61 #include <net80211/ieee80211_superg.h>
  62 #endif
  63 #include <net80211/ieee80211_ratectl.h>
  64 #include <net80211/ieee80211_sta.h>
  65 #include <net80211/ieee80211_vht.h>
  66
  67 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  68
  69 static  void sta_vattach(struct ieee80211vap *);
  70 static  void sta_beacon_miss(struct ieee80211vap *);
  71 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  72 static  int sta_input(struct ieee80211_node *, struct mbuf *,
  73             const struct ieee80211_rx_stats *, int, int);
  74 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  75             int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
  76 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  77
  78 void
  79 ieee80211_sta_attach(struct ieee80211com *ic)
  80 {
  81         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  82 }
  83
  84 void
  85 ieee80211_sta_detach(struct ieee80211com *ic)
  86 {
  87 }
  88
  89 static void
  90 sta_vdetach(struct ieee80211vap *vap)
  91 {
  92 }
  93
  94 static void
  95 sta_vattach(struct ieee80211vap *vap)
  96 {
  97         vap->iv_newstate = sta_newstate;
  98         vap->iv_input = sta_input;
  99         vap->iv_recv_mgmt = sta_recv_mgmt;
 100         vap->iv_recv_ctl = sta_recv_ctl;
 101         vap->iv_opdetach = sta_vdetach;
 102         vap->iv_bmiss = sta_beacon_miss;
 103 }
 104
 105 /*
 106  * Handle a beacon miss event.  The common code filters out
 107  * spurious events that can happen when scanning and/or before
 108  * reaching RUN state.
 109  */
 110 static void
 111 sta_beacon_miss(struct ieee80211vap *vap)
 112 {
 113         struct ieee80211com *ic = vap->iv_ic;
 114
 115         IEEE80211_LOCK_ASSERT(ic);
 116
 117         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 118         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 119             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 120
 121         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 122             "beacon miss, mode %s state %s\n",
 123             ieee80211_opmode_name[vap->iv_opmode],
 124             ieee80211_state_name[vap->iv_state]);
 125
 126         if (vap->iv_state == IEEE80211_S_CSA) {
 127                 /*
 128                  * A Channel Switch is pending; assume we missed the
 129                  * beacon that would've completed the process and just
 130                  * force the switch.  If we made a mistake we'll not
 131                  * find the AP on the new channel and fall back to a
 132                  * normal scan.
 133                  */
 134                 ieee80211_csa_completeswitch(ic);
 135                 return;
 136         }
 137         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 138                 /*
 139                  * Send a directed probe req before falling back to a
 140                  * scan; if we receive a response ic_bmiss_count will
 141                  * be reset.  Some cards mistakenly report beacon miss
 142                  * so this avoids the expensive scan if the ap is
 143                  * still there.
 144                  */
 145                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 146                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 147                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 148                 return;
 149         }
 150
 151         callout_stop(&vap->iv_swbmiss);
 152         vap->iv_bmiss_count = 0;
 153         vap->iv_stats.is_beacon_miss++;
 154         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 155 #ifdef IEEE80211_SUPPORT_SUPERG
 156
 157                 /*
 158                  * If we receive a beacon miss interrupt when using
 159                  * dynamic turbo, attempt to switch modes before
 160                  * reassociating.
 161                  */
 162                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 163                         ieee80211_dturbo_switch(vap,
 164                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 165 #endif
 166                 /*
 167                  * Try to reassociate before scanning for a new ap.
 168                  */
 169                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 170         } else {
 171                 /*
 172                  * Somebody else is controlling state changes (e.g.
 173                  * a user-mode app) don't do anything that would
 174                  * confuse them; just drop into scan mode so they'll
 175                  * notified of the state change and given control.
 176                  */
 177                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 178         }
 179 }
 180
 181 /*
 182  * Handle deauth with reason.  We retry only for
 183  * the cases where we might succeed.  Otherwise
 184  * we downgrade the ap and scan.
 185  */
 186 static void
 187 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 188 {
 189         switch (reason) {
 190         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 191         case IEEE80211_STATUS_TIMEOUT:
 192         case IEEE80211_REASON_ASSOC_EXPIRE:
 193         case IEEE80211_REASON_NOT_AUTHED:
 194         case IEEE80211_REASON_NOT_ASSOCED:
 195         case IEEE80211_REASON_ASSOC_LEAVE:
 196         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 197                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 198                 break;
 199         default:
 200                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 201                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 202                         ieee80211_check_scan_current(vap);
 203                 break;
 204         }
 205 }
 206
 207 static void
 208 sta_swbmiss_start(struct ieee80211vap *vap)
 209 {
 210
 211         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
 212                 /*
 213                  * Start s/w beacon miss timer for devices w/o
 214                  * hardware support.  We fudge a bit here since
 215                  * we're doing this in software.
 216                  */
 217                 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 218                     2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
 219                 vap->iv_swbmiss_count = 0;
 220                 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 221                     ieee80211_swbmiss, vap);
 222         }
 223 }
 224
 225 /*
 226  * IEEE80211_M_STA vap state machine handler.
 227  * This routine handles the main states in the 802.11 protocol.
 228  */
 229 static int
 230 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 231 {
 232         struct ieee80211com *ic = vap->iv_ic;
 233         struct ieee80211_node *ni;
 234         enum ieee80211_state ostate;
 235
 236         IEEE80211_LOCK_ASSERT(ic);
 237
 238         ostate = vap->iv_state;
 239         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 240             __func__, ieee80211_state_name[ostate],
 241             ieee80211_state_name[nstate], arg);
 242         vap->iv_state = nstate;                 /* state transition */
 243         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 244         if (ostate != IEEE80211_S_SCAN)
 245                 ieee80211_cancel_scan(vap);     /* background scan */
 246         ni = vap->iv_bss;                       /* NB: no reference held */
 247         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 248                 callout_stop(&vap->iv_swbmiss);
 249         switch (nstate) {
 250         case IEEE80211_S_INIT:
 251                 switch (ostate) {
 252                 case IEEE80211_S_SLEEP:
 253                         /* XXX wakeup */
 254                         /* XXX driver hook to wakeup the hardware? */
 255                 case IEEE80211_S_RUN:
 256                         IEEE80211_SEND_MGMT(ni,
 257                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 258                             IEEE80211_REASON_ASSOC_LEAVE);
 259                         ieee80211_sta_leave(ni);
 260                         break;
 261                 case IEEE80211_S_ASSOC:
 262                         IEEE80211_SEND_MGMT(ni,
 263                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 264                             IEEE80211_REASON_AUTH_LEAVE);
 265                         break;
 266                 case IEEE80211_S_SCAN:
 267                         ieee80211_cancel_scan(vap);
 268                         break;
 269                 default:
 270                         break;
 271                 }
 272                 if (ostate != IEEE80211_S_INIT) {
 273                         /* NB: optimize INIT -> INIT case */
 274                         ieee80211_reset_bss(vap);
 275                 }
 276                 if (vap->iv_auth->ia_detach != NULL)
 277                         vap->iv_auth->ia_detach(vap);
 278                 break;
 279         case IEEE80211_S_SCAN:
 280                 switch (ostate) {
 281                 case IEEE80211_S_INIT:
 282                         /*
 283                          * Initiate a scan.  We can come here as a result
 284                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 285                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 286                          * and the scan request parameters will be present
 287                          * in iv_scanreq.  Otherwise we do the default.
 288                          */
 289                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 290                                 ieee80211_check_scan(vap,
 291                                     vap->iv_scanreq_flags,
 292                                     vap->iv_scanreq_duration,
 293                                     vap->iv_scanreq_mindwell,
 294                                     vap->iv_scanreq_maxdwell,
 295                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 296                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 297                         } else
 298                                 ieee80211_check_scan_current(vap);
 299                         break;
 300                 case IEEE80211_S_SCAN:
 301                 case IEEE80211_S_AUTH:
 302                 case IEEE80211_S_ASSOC:
 303                         /*
 304                          * These can happen either because of a timeout
 305                          * on an assoc/auth response or because of a
 306                          * change in state that requires a reset.  For
 307                          * the former we're called with a non-zero arg
 308                          * that is the cause for the failure; pass this
 309                          * to the scan code so it can update state.
 310                          * Otherwise trigger a new scan unless we're in
 311                          * manual roaming mode in which case an application
 312                          * must issue an explicit scan request.
 313                          */
 314                         if (arg != 0)
 315                                 ieee80211_scan_assoc_fail(vap,
 316                                         vap->iv_bss->ni_macaddr, arg);
 317                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 318                                 ieee80211_check_scan_current(vap);
 319                         break;
 320                 case IEEE80211_S_SLEEP:         /* beacon miss */
 321                         /*
 322                          * XXX if in sleep we need to wakeup the hardware.
 323                          */
 324                         /* FALLTHROUGH */
 325                 case IEEE80211_S_RUN:           /* beacon miss */
 326                         /*
 327                          * Beacon miss.  Notify user space and if not
 328                          * under control of a user application (roaming
 329                          * manual) kick off a scan to re-connect.
 330                          */
 331
 332                         ieee80211_sta_leave(ni);
 333                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 334                                 ieee80211_check_scan_current(vap);
 335                         break;
 336                 default:
 337                         goto invalid;
 338                 }
 339                 break;
 340         case IEEE80211_S_AUTH:
 341                 switch (ostate) {
 342                 case IEEE80211_S_INIT:
 343                 case IEEE80211_S_SCAN:
 344                         IEEE80211_SEND_MGMT(ni,
 345                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 346                         break;
 347                 case IEEE80211_S_AUTH:
 348                 case IEEE80211_S_ASSOC:
 349                         switch (arg & 0xff) {
 350                         case IEEE80211_FC0_SUBTYPE_AUTH:
 351                                 /* ??? */
 352                                 IEEE80211_SEND_MGMT(ni,
 353                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 354                                 break;
 355                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 356                                 sta_authretry(vap, ni, arg>>8);
 357                                 break;
 358                         }
 359                         break;
 360                 case IEEE80211_S_SLEEP:
 361                 case IEEE80211_S_RUN:
 362                         switch (arg & 0xff) {
 363                         case IEEE80211_FC0_SUBTYPE_AUTH:
 364                                 IEEE80211_SEND_MGMT(ni,
 365                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 366                                 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
 367                                 break;
 368                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 369                                 ieee80211_sta_leave(ni);
 370                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 371                                         /* try to reauth */
 372                                         IEEE80211_SEND_MGMT(ni,
 373                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 374                                 }
 375                                 break;
 376                         }
 377                         break;
 378                 default:
 379                         goto invalid;
 380                 }
 381                 break;
 382         case IEEE80211_S_ASSOC:
 383                 switch (ostate) {
 384                 case IEEE80211_S_AUTH:
 385                 case IEEE80211_S_ASSOC:
 386                         IEEE80211_SEND_MGMT(ni,
 387                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 388                         break;
 389                 case IEEE80211_S_SLEEP:         /* cannot happen */
 390                 case IEEE80211_S_RUN:
 391                         ieee80211_sta_leave(ni);
 392                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 393                                 IEEE80211_SEND_MGMT(ni, arg ?
 394                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 395                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 396                         }
 397                         break;
 398                 default:
 399                         goto invalid;
 400                 }
 401                 break;
 402         case IEEE80211_S_RUN:
 403                 if (vap->iv_flags & IEEE80211_F_WPA) {
 404                         /* XXX validate prerequisites */
 405                 }
 406                 switch (ostate) {
 407                 case IEEE80211_S_RUN:
 408                 case IEEE80211_S_CSA:
 409                         break;
 410                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 411                 case IEEE80211_S_ASSOC:
 412 #ifdef IEEE80211_DEBUG
 413                         if (ieee80211_msg_debug(vap)) {
 414                                 ieee80211_note(vap, "%s with %s ssid ",
 415                                     (vap->iv_opmode == IEEE80211_M_STA ?
 416                                     "associated" : "synchronized"),
 417                                     ether_sprintf(ni->ni_bssid));
 418                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 419                                     ni->ni_esslen);
 420                                 /* XXX MCS/HT */
 421                                 printf(" channel %d start %uMb\n",
 422                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 423                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 424                         }
 425 #endif
 426                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 427                         ieee80211_notify_node_join(ni,
 428                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 429                         break;
 430                 case IEEE80211_S_SLEEP:
 431                         /* Wake up from sleep */
 432                         vap->iv_sta_ps(vap, 0);
 433                         break;
 434                 default:
 435                         goto invalid;
 436                 }
 437                 ieee80211_sync_curchan(ic);
 438                 if (ostate != IEEE80211_S_RUN)
 439                         sta_swbmiss_start(vap);
 440                 /*
 441                  * When 802.1x is not in use mark the port authorized
 442                  * at this point so traffic can flow.
 443                  */
 444                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 445                         ieee80211_node_authorize(ni);
 446                 /*
 447                  * Fake association when joining an existing bss.
 448                  *
 449                  * Don't do this if we're doing SLEEP->RUN.
 450                  */
 451                 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
 452                         ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
 453                 break;
 454         case IEEE80211_S_CSA:
 455                 if (ostate != IEEE80211_S_RUN)
 456                         goto invalid;
 457                 break;
 458         case IEEE80211_S_SLEEP:
 459                 sta_swbmiss_start(vap);
 460                 vap->iv_sta_ps(vap, 1);
 461                 break;
 462         default:
 463         invalid:
 464                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 465                     "%s: unexpected state transition %s -> %s\n", __func__,
 466                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 467                 break;
 468         }
 469         return 0;
 470 }
 471
 472 /*
 473  * Return non-zero if the frame is an echo of a multicast
 474  * frame sent by ourself.  The dir is known to be DSTODS.
 475  */
 476 static __inline int
 477 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 478 {
 479 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 480 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 481         const uint8_t *sa;
 482
 483         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 484
 485         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 486                 return 0;
 487         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 488         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 489 #undef WH4
 490 #undef QWH4
 491 }
 492
 493 /*
 494  * Return non-zero if the frame is an echo of a multicast
 495  * frame sent by ourself.  The dir is known to be FROMDS.
 496  */
 497 static __inline int
 498 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 499 {
 500         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 501
 502         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 503                 return 0;
 504         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 505 }
 506
 507 /*
 508  * Decide if a received management frame should be
 509  * printed when debugging is enabled.  This filters some
 510  * of the less interesting frames that come frequently
 511  * (e.g. beacons).
 512  */
 513 static __inline int
 514 doprint(struct ieee80211vap *vap, int subtype)
 515 {
 516         switch (subtype) {
 517         case IEEE80211_FC0_SUBTYPE_BEACON:
 518                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 519         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 520                 return 0;
 521         }
 522         return 1;
 523 }
 524
 525 /*
 526  * Process a received frame.  The node associated with the sender
 527  * should be supplied.  If nothing was found in the node table then
 528  * the caller is assumed to supply a reference to iv_bss instead.
 529  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 530  * during AP scanning to select a AP to associate with; it can have
 531  * any units so long as values have consistent units and higher values
 532  * mean ``better signal''.  The receive timestamp is currently not used
 533  * by the 802.11 layer.
 534  */
 535 static int
 536 sta_input(struct ieee80211_node *ni, struct mbuf *m,
 537     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 538 {
 539         struct ieee80211vap *vap = ni->ni_vap;
 540         struct ieee80211com *ic = ni->ni_ic;
 541         struct ifnet *ifp = vap->iv_ifp;
 542         struct ieee80211_frame *wh;
 543         struct ieee80211_key *key;
 544         struct ether_header *eh;
 545         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 546         uint8_t dir, type, subtype, qos;
 547         uint8_t *bssid;
 548         int is_hw_decrypted = 0;
 549         int has_decrypted = 0;
 550
 551         KASSERT(ni != NULL, ("%s: null node, mbuf %p", __func__, m));
 552
 553         /* Early init in case of early error case. */
 554         type = -1;
 555
 556         /*
 557          * Bit of a cheat here, we use a pointer for a 3-address
 558          * frame format but don't reference fields past outside
 559          * ieee80211_frame_min (or other shorter frames) w/o first
 560          * validating the data is present.
 561          */
 562         wh = mtod(m, struct ieee80211_frame *);
 563
 564         if (m->m_pkthdr.len < 2 || m->m_pkthdr.len < ieee80211_anyhdrsize(wh)) {
 565                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 566                     ni->ni_macaddr, NULL,
 567                     "too short (1): len %u", m->m_pkthdr.len);
 568                 vap->iv_stats.is_rx_tooshort++;
 569                 goto err;
 570         }
 571         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 572             IEEE80211_FC0_VERSION_0) {
 573                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 574                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 575                     wh->i_fc[0], wh->i_fc[1]);
 576                 vap->iv_stats.is_rx_badversion++;
 577                 goto err;
 578         }
 579
 580         /*
 581          * Some devices do hardware decryption all the way through
 582          * to pretending the frame wasn't encrypted in the first place.
 583          * So, tag it appropriately so it isn't discarded inappropriately.
 584          */
 585         if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
 586                 is_hw_decrypted = 1;
 587
 588         if (m->m_flags & M_AMPDU_MPDU) {
 589                 /*
 590                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 591                  * w/ M_AMPDU_MPDU marked have already passed through
 592                  * here but were received out of order and been held on
 593                  * the reorder queue.  When resubmitted they are marked
 594                  * with the M_AMPDU_MPDU flag and we can bypass most of
 595                  * the normal processing.
 596                  */
 597                 type = IEEE80211_FC0_TYPE_DATA;
 598                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 599                 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
 600                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 601                 goto resubmit_ampdu;
 602         }
 603
 604         ni->ni_inact = ni->ni_inact_reload;
 605
 606         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 607         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 608         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 609         /*
 610          * Control frames are not folowing the header scheme of data and mgmt
 611          * frames so we do not apply extra checks here.
 612          * We probably should do checks on RA (+TA) where available for those
 613          * too, but for now do not drop them.
 614          */
 615         if (type != IEEE80211_FC0_TYPE_CTL &&
 616             (ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 617                 bssid = wh->i_addr2;
 618                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 619                         /* not interested in */
 620                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 621                             bssid, NULL, "%s", "not to bss");
 622                         vap->iv_stats.is_rx_wrongbss++;
 623                         goto out;
 624                 }
 625
 626                 /*
 627                  * Some devices may be in a promiscuous mode
 628                  * where they receive frames for multiple station
 629                  * addresses.
 630                  *
 631                  * If we receive a data frame that isn't
 632                  * destined to our VAP MAC, drop it.
 633                  *
 634                  * XXX TODO: This is only enforced when not scanning;
 635                  * XXX it assumes a software-driven scan will put the NIC
 636                  * XXX into a "no data frames" mode before setting this
 637                  * XXX flag. Otherwise it may be possible that we'll still
 638                  * XXX process data frames whilst scanning.
 639                  */
 640                 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
 641                     && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
 642                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 643                             bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
 644                             IF_LLADDR(ifp), ":", wh->i_addr1, ":");
 645                         vap->iv_stats.is_rx_wrongbss++;
 646                         goto out;
 647                 }
 648
 649                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 650                 ni->ni_noise = nf;
 651                 if ( IEEE80211_HAS_SEQ(type, subtype) &&
 652                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 653                         uint8_t tid = ieee80211_gettid(wh);
 654                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 655                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 656                                 ic->ic_wme.wme_hipri_traffic++;
 657                         if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
 658                                 goto out;
 659                 }
 660         }
 661
 662         switch (type) {
 663         case IEEE80211_FC0_TYPE_DATA:
 664                 hdrspace = ieee80211_hdrspace(ic, wh);
 665                 if (m->m_len < hdrspace &&
 666                     (m = m_pullup(m, hdrspace)) == NULL) {
 667                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 668                             ni->ni_macaddr, NULL,
 669                             "data too short: expecting %u", hdrspace);
 670                         vap->iv_stats.is_rx_tooshort++;
 671                         goto out;               /* XXX */
 672                 }
 673                 /*
 674                  * Handle A-MPDU re-ordering.  If the frame is to be
 675                  * processed directly then ieee80211_ampdu_reorder
 676                  * will return 0; otherwise it has consumed the mbuf
 677                  * and we should do nothing more with it.
 678                  */
 679                 if ((m->m_flags & M_AMPDU) &&
 680                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 681                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 682                     ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
 683                         m = NULL;
 684                         goto out;
 685                 }
 686         resubmit_ampdu:
 687                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 688                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 689                             isfromds_mcastecho(vap, wh)) {
 690                                 /*
 691                                  * In IEEE802.11 network, multicast
 692                                  * packets sent from "me" are broadcast
 693                                  * from the AP; silently discard for
 694                                  * SIMPLEX interface.
 695                                  */
 696                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 697                                     wh, "data", "%s", "multicast echo");
 698                                 vap->iv_stats.is_rx_mcastecho++;
 699                                 goto out;
 700                         }
 701                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 702                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 703                                 /*
 704                                  * DWDS sta's must drop 3-address mcast frames
 705                                  * as they will be sent separately as a 4-addr
 706                                  * frame.  Accepting the 3-addr frame will
 707                                  * confuse the bridge into thinking the sending
 708                                  * sta is located at the end of WDS link.
 709                                  */
 710                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 711                                     "3-address data", "%s", "DWDS enabled");
 712                                 vap->iv_stats.is_rx_mcastecho++;
 713                                 goto out;
 714                         }
 715                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 716                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 717                                 IEEE80211_DISCARD(vap,
 718                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 719                                     "%s", "DWDS not enabled");
 720                                 vap->iv_stats.is_rx_wrongdir++;
 721                                 goto out;
 722                         }
 723                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 724                             isdstods_mcastecho(vap, wh)) {
 725                                 /*
 726                                  * In IEEE802.11 network, multicast
 727                                  * packets sent from "me" are broadcast
 728                                  * from the AP; silently discard for
 729                                  * SIMPLEX interface.
 730                                  */
 731                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 732                                     "4-address data", "%s", "multicast echo");
 733                                 vap->iv_stats.is_rx_mcastecho++;
 734                                 goto out;
 735                         }
 736                 } else {
 737                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 738                             "data", "incorrect dir 0x%x", dir);
 739                         vap->iv_stats.is_rx_wrongdir++;
 740                         goto out;
 741                 }
 742
 743                 /*
 744                  * Handle privacy requirements for hardware decryption
 745                  * devices.
 746                  *
 747                  * For those devices, a handful of things happen.
 748                  *
 749                  * + If IV has been stripped, then we can't run
 750                  *   ieee80211_crypto_decap() - none of the key
 751                  * + If MIC has been stripped, we can't validate
 752                  *   MIC here.
 753                  * + If MIC fails, then we need to communicate a
 754                  *   MIC failure up to the stack - but we don't know
 755                  *   which key was used.
 756                  */
 757
 758                 /*
 759                  * Handle privacy requirements.  Note that we
 760                  * must not be preempted from here until after
 761                  * we (potentially) call ieee80211_crypto_demic;
 762                  * otherwise we may violate assumptions in the
 763                  * crypto cipher modules used to do delayed update
 764                  * of replay sequence numbers.
 765                  */
 766                 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
 767                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 768                                 /*
 769                                  * Discard encrypted frames when privacy is off.
 770                                  */
 771                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 772                                     wh, "WEP", "%s", "PRIVACY off");
 773                                 vap->iv_stats.is_rx_noprivacy++;
 774                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 775                                 goto out;
 776                         }
 777                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 778                                 /* NB: stats+msgs handled in crypto_decap */
 779                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 780                                 goto out;
 781                         }
 782                         wh = mtod(m, struct ieee80211_frame *);
 783                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 784                         has_decrypted = 1;
 785                 } else {
 786                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 787                         key = NULL;
 788                 }
 789
 790                 /*
 791                  * Save QoS bits for use below--before we strip the header.
 792                  */
 793                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
 794                         qos = ieee80211_getqos(wh)[0];
 795                 else
 796                         qos = 0;
 797
 798                 /*
 799                  * Next up, any fragmentation.
 800                  */
 801                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 802                         m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
 803                         if (m == NULL) {
 804                                 /* Fragment dropped or frame not complete yet */
 805                                 goto out;
 806                         }
 807                 }
 808                 wh = NULL;              /* no longer valid, catch any uses */
 809
 810                 /*
 811                  * Next strip any MSDU crypto bits.
 812                  *
 813                  * Note: we can't do MIC stripping/verification if the
 814                  * upper layer has stripped it.  We have to check MIC
 815                  * ourselves.  So, key may be NULL, but we have to check
 816                  * the RX status.
 817                  */
 818                 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
 819                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 820                             ni->ni_macaddr, "data", "%s", "demic error");
 821                         vap->iv_stats.is_rx_demicfail++;
 822                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 823                         goto out;
 824                 }
 825
 826                 /* copy to listener after decrypt */
 827                 if (ieee80211_radiotap_active_vap(vap))
 828                         ieee80211_radiotap_rx(vap, m);
 829                 need_tap = 0;
 830
 831                 /*
 832                  * Finally, strip the 802.11 header.
 833                  */
 834                 m = ieee80211_decap(vap, m, hdrspace, qos);
 835                 if (m == NULL) {
 836                         /* XXX mask bit to check for both */
 837                         /* don't count Null data frames as errors */
 838                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 839                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 840                                 goto out;
 841                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 842                             ni->ni_macaddr, "data", "%s", "decap error");
 843                         vap->iv_stats.is_rx_decap++;
 844                         IEEE80211_NODE_STAT(ni, rx_decap);
 845                         goto err;
 846                 }
 847                 if (!(qos & IEEE80211_QOS_AMSDU))
 848                         eh = mtod(m, struct ether_header *);
 849                 else
 850                         eh = NULL;
 851                 if (!ieee80211_node_is_authorized(ni)) {
 852                         /*
 853                          * Deny any non-PAE frames received prior to
 854                          * authorization.  For open/shared-key
 855                          * authentication the port is mark authorized
 856                          * after authentication completes.  For 802.1x
 857                          * the port is not marked authorized by the
 858                          * authenticator until the handshake has completed.
 859                          */
 860                         if (eh == NULL ||
 861                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 862                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 863                                     ni->ni_macaddr, "data", "unauthorized or "
 864                                     "unknown port: ether type 0x%x len %u",
 865                                     eh == NULL ? -1 : eh->ether_type,
 866                                     m->m_pkthdr.len);
 867                                 vap->iv_stats.is_rx_unauth++;
 868                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 869                                 goto err;
 870                         }
 871                 } else {
 872                         /*
 873                          * When denying unencrypted frames, discard
 874                          * any non-PAE frames received without encryption.
 875                          */
 876                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 877                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 878                             (is_hw_decrypted == 0) &&
 879                             (eh == NULL ||
 880                              eh->ether_type != htons(ETHERTYPE_PAE))) {
 881                                 /*
 882                                  * Drop unencrypted frames.
 883                                  */
 884                                 vap->iv_stats.is_rx_unencrypted++;
 885                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 886                                 goto out;
 887                         }
 888                 }
 889                 /* XXX require HT? */
 890                 if (qos & IEEE80211_QOS_AMSDU) {
 891                         m = ieee80211_decap_amsdu(ni, m);
 892                         if (m == NULL)
 893                                 return IEEE80211_FC0_TYPE_DATA;
 894                 } else {
 895 #ifdef IEEE80211_SUPPORT_SUPERG
 896                         m = ieee80211_decap_fastframe(vap, ni, m);
 897                         if (m == NULL)
 898                                 return IEEE80211_FC0_TYPE_DATA;
 899 #endif
 900                 }
 901                 ieee80211_deliver_data(vap, ni, m);
 902                 return IEEE80211_FC0_TYPE_DATA;
 903
 904         case IEEE80211_FC0_TYPE_MGT:
 905                 vap->iv_stats.is_rx_mgmt++;
 906                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 907                 if (dir != IEEE80211_FC1_DIR_NODS) {
 908                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 909                             wh, "data", "incorrect dir 0x%x", dir);
 910                         vap->iv_stats.is_rx_wrongdir++;
 911                         goto err;
 912                 }
 913                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 914                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 915                             ni->ni_macaddr, "mgt", "too short: len %u",
 916                             m->m_pkthdr.len);
 917                         vap->iv_stats.is_rx_tooshort++;
 918                         goto out;
 919                 }
 920 #ifdef IEEE80211_DEBUG
 921                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 922                     ieee80211_msg_dumppkts(vap)) {
 923                         if_printf(ifp, "received %s from %s rssi %d\n",
 924                             ieee80211_mgt_subtype_name(subtype),
 925                             ether_sprintf(wh->i_addr2), rssi);
 926                 }
 927 #endif
 928
 929                 /*
 930                  * Note: See above for hardware offload privacy requirements.
 931                  *       It also applies here.
 932                  */
 933
 934                 /*
 935                  * Again, having encrypted flag set check would be good, but
 936                  * then we have to also handle crypto_decap() like above.
 937                  */
 938                 if (IEEE80211_IS_PROTECTED(wh)) {
 939                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 940                                 /*
 941                                  * Only shared key auth frames with a challenge
 942                                  * should be encrypted, discard all others.
 943                                  */
 944                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 945                                     wh, ieee80211_mgt_subtype_name(subtype),
 946                                     "%s", "WEP set but not permitted");
 947                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 948                                 goto out;
 949                         }
 950                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 951                                 /*
 952                                  * Discard encrypted frames when privacy is off.
 953                                  */
 954                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 955                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 956                                 vap->iv_stats.is_rx_noprivacy++;
 957                                 goto out;
 958                         }
 959                         hdrspace = ieee80211_hdrspace(ic, wh);
 960
 961                         /*
 962                          * Again, if IV/MIC was stripped, then this whole
 963                          * setup will fail.  That's going to need some poking.
 964                          */
 965                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 966                                 /* NB: stats+msgs handled in crypto_decap */
 967                                 goto out;
 968                         }
 969                         has_decrypted = 1;
 970                         wh = mtod(m, struct ieee80211_frame *);
 971                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 972                 }
 973                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 974                 goto out;
 975
 976         case IEEE80211_FC0_TYPE_CTL:
 977                 vap->iv_stats.is_rx_ctl++;
 978                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 979                 vap->iv_recv_ctl(ni, m, subtype);
 980                 goto out;
 981
 982         default:
 983                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 984                     wh, NULL, "bad frame type 0x%x", type);
 985                 /* should not come here */
 986                 break;
 987         }
 988 err:
 989         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 990 out:
 991         if (m != NULL) {
 992                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 993                         ieee80211_radiotap_rx(vap, m);
 994                 m_freem(m);
 995         }
 996         return type;
 997 }
 998
 999 static void
1000 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1001     int rssi, int nf, uint16_t seq, uint16_t status)
1002 {
1003         struct ieee80211vap *vap = ni->ni_vap;
1004
1005         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
1006                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1007                     ni->ni_macaddr, "open auth",
1008                     "bad sta auth mode %u", ni->ni_authmode);
1009                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
1010                 return;
1011         }
1012         if (vap->iv_state != IEEE80211_S_AUTH ||
1013             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
1014                 vap->iv_stats.is_rx_bad_auth++;
1015                 return;
1016         }
1017         if (status != 0) {
1018                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1019                     ni, "open auth failed (reason %d)", status);
1020                 vap->iv_stats.is_rx_auth_fail++;
1021                 vap->iv_stats.is_rx_authfail_code = status;
1022                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1023                     IEEE80211_SCAN_FAIL_STATUS);
1024         } else
1025                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1026 }
1027
1028 static void
1029 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1030     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1031     uint16_t seq, uint16_t status)
1032 {
1033         struct ieee80211vap *vap = ni->ni_vap;
1034         uint8_t *challenge;
1035
1036         /*
1037          * NB: this can happen as we allow pre-shared key
1038          * authentication to be enabled w/o wep being turned
1039          * on so that configuration of these can be done
1040          * in any order.  It may be better to enforce the
1041          * ordering in which case this check would just be
1042          * for sanity/consistency.
1043          */
1044         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1045                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1046                     ni->ni_macaddr, "shared key auth",
1047                     "%s", " PRIVACY is disabled");
1048                 goto bad;
1049         }
1050         /*
1051          * Pre-shared key authentication is evil; accept
1052          * it only if explicitly configured (it is supported
1053          * mainly for compatibility with clients like OS X).
1054          */
1055         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1056             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1057                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1058                     ni->ni_macaddr, "shared key auth",
1059                     "bad sta auth mode %u", ni->ni_authmode);
1060                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1061                 goto bad;
1062         }
1063
1064         challenge = NULL;
1065         if (frm + 1 < efrm) {
1066                 if ((frm[1] + 2) > (efrm - frm)) {
1067                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1068                             ni->ni_macaddr, "shared key auth",
1069                             "ie %d/%d too long",
1070                             frm[0], (frm[1] + 2) - (efrm - frm));
1071                         vap->iv_stats.is_rx_bad_auth++;
1072                         goto bad;
1073                 }
1074                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1075                         challenge = frm;
1076                 frm += frm[1] + 2;
1077         }
1078         switch (seq) {
1079         case IEEE80211_AUTH_SHARED_CHALLENGE:
1080         case IEEE80211_AUTH_SHARED_RESPONSE:
1081                 if (challenge == NULL) {
1082                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1083                             ni->ni_macaddr, "shared key auth",
1084                             "%s", "no challenge");
1085                         vap->iv_stats.is_rx_bad_auth++;
1086                         goto bad;
1087                 }
1088                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1089                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1090                             ni->ni_macaddr, "shared key auth",
1091                             "bad challenge len %d", challenge[1]);
1092                         vap->iv_stats.is_rx_bad_auth++;
1093                         goto bad;
1094                 }
1095         default:
1096                 break;
1097         }
1098         if (vap->iv_state != IEEE80211_S_AUTH)
1099                 return;
1100         switch (seq) {
1101         case IEEE80211_AUTH_SHARED_PASS:
1102                 if (ni->ni_challenge != NULL) {
1103                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1104                         ni->ni_challenge = NULL;
1105                 }
1106                 if (status != 0) {
1107                         IEEE80211_NOTE_FRAME(vap,
1108                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1109                             "shared key auth failed (reason %d)", status);
1110                         vap->iv_stats.is_rx_auth_fail++;
1111                         vap->iv_stats.is_rx_authfail_code = status;
1112                         return;
1113                 }
1114                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1115                 break;
1116         case IEEE80211_AUTH_SHARED_CHALLENGE:
1117                 if (!ieee80211_alloc_challenge(ni))
1118                         return;
1119                 /* XXX could optimize by passing recvd challenge */
1120                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1121                 IEEE80211_SEND_MGMT(ni,
1122                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1123                 break;
1124         default:
1125                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1126                     wh, "shared key auth", "bad seq %d", seq);
1127                 vap->iv_stats.is_rx_bad_auth++;
1128                 return;
1129         }
1130         return;
1131 bad:
1132         /*
1133          * Kick the state machine.  This short-circuits
1134          * using the mgt frame timeout to trigger the
1135          * state transition.
1136          */
1137         if (vap->iv_state == IEEE80211_S_AUTH)
1138                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1139                     IEEE80211_SCAN_FAIL_STATUS);
1140 }
1141
1142 /*
1143  * Parse the WME IE for QoS and U-APSD information.
1144  *
1145  * Returns -1 if the IE isn't found, 1 if it's found.
1146  */
1147 int
1148 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh,
1149     struct ieee80211_node *ni)
1150 {
1151         u_int len = frm[1];
1152
1153         ni->ni_uapsd = 0;
1154
1155         if (len < sizeof(struct ieee80211_wme_param)-2) {
1156                 IEEE80211_DISCARD_IE(ni->ni_vap,
1157                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1158                     wh, "WME", "too short, len %u", len);
1159                 return -1;
1160         }
1161
1162         ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET];
1163
1164         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC,
1165             ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd);
1166
1167         return 1;
1168 }
1169
1170 int
1171 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1172         const struct ieee80211_frame *wh, uint8_t *qosinfo)
1173 {
1174         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1175         u_int len = frm[1], qosinfo_count;
1176         int i;
1177
1178         *qosinfo = 0;
1179
1180         if (len < sizeof(struct ieee80211_wme_param)-2) {
1181                 IEEE80211_DISCARD_IE(vap,
1182                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1183                     wh, "WME", "too short, len %u", len);
1184                 return -1;
1185         }
1186         *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1187         qosinfo_count = *qosinfo & WME_QOSINFO_COUNT;
1188
1189         /* XXX do proper check for wraparound */
1190         if (qosinfo_count == wme->wme_wmeChanParams.cap_info)
1191                 return 0;
1192         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1193         for (i = 0; i < WME_NUM_AC; i++) {
1194                 struct wmeParams *wmep =
1195                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1196                 /* NB: ACI not used */
1197                 wmep->wmep_acm = _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_ACM);
1198                 wmep->wmep_aifsn =
1199                     _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_AIFSN);
1200                 wmep->wmep_logcwmin =
1201                      _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMIN);
1202                 wmep->wmep_logcwmax =
1203                      _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMAX);
1204                 wmep->wmep_txopLimit = le16dec(frm+2);
1205                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
1206                     "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n",
1207                     __func__,
1208                     i,
1209                     wmep->wmep_acm,
1210                     wmep->wmep_aifsn,
1211                     wmep->wmep_logcwmin,
1212                     wmep->wmep_logcwmax,
1213                     wmep->wmep_txopLimit);
1214                 frm += 4;
1215         }
1216         wme->wme_wmeChanParams.cap_info = qosinfo_count;
1217         return 1;
1218 }
1219
1220 /*
1221  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1222  * is the first CSA then initiate the switch.  Otherwise we
1223  * track state and trigger completion and/or cancel of the switch.
1224  * XXX should be public for IBSS use
1225  */
1226 static void
1227 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1228         const struct ieee80211_frame *wh)
1229 {
1230         struct ieee80211com *ic = vap->iv_ic;
1231         const struct ieee80211_csa_ie *csa =
1232             (const struct ieee80211_csa_ie *) frm;
1233
1234         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1235             ("state %s", ieee80211_state_name[vap->iv_state]));
1236
1237         if (csa->csa_mode > 1) {
1238                 IEEE80211_DISCARD_IE(vap,
1239                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1240                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1241                 return;
1242         }
1243         IEEE80211_LOCK(ic);
1244         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1245                 /*
1246                  * Convert the channel number to a channel reference.  We
1247                  * try first to preserve turbo attribute of the current
1248                  * channel then fallback.  Note this will not work if the
1249                  * CSA specifies a channel that requires a band switch (e.g.
1250                  * 11a => 11g).  This is intentional as 11h is defined only
1251                  * for 5GHz/11a and because the switch does not involve a
1252                  * reassociation, protocol state (capabilities, negotated
1253                  * rates, etc) may/will be wrong.
1254                  */
1255                 struct ieee80211_channel *c =
1256                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1257                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1258                 if (c == NULL) {
1259                         c = ieee80211_find_channel_byieee(ic,
1260                             csa->csa_newchan,
1261                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1262                         if (c == NULL) {
1263                                 IEEE80211_DISCARD_IE(vap,
1264                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1265                                     wh, "CSA", "invalid channel %u",
1266                                     csa->csa_newchan);
1267                                 goto done;
1268                         }
1269                 }
1270 #if IEEE80211_CSA_COUNT_MIN > 0
1271                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1272                         /*
1273                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1274                          * reduce the risk of being redirected by a fabricated
1275                          * CSA.  If a valid CSA is dropped we'll still get a
1276                          * beacon miss when the AP leaves the channel so we'll
1277                          * eventually follow to the new channel.
1278                          *
1279                          * NOTE: this violates the 11h spec that states that
1280                          * count may be any value and if 0 then a switch
1281                          * should happen asap.
1282                          */
1283                         IEEE80211_DISCARD_IE(vap,
1284                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1285                             wh, "CSA", "count %u too small, must be >= %u",
1286                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1287                         goto done;
1288                 }
1289 #endif
1290                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1291         } else {
1292                 /*
1293                  * Validate this ie against the initial CSA.  We require
1294                  * mode and channel not change and the count must be
1295                  * monotonically decreasing.  This may be pointless and
1296                  * canceling the switch as a result may be too paranoid but
1297                  * in the worst case if we drop out of CSA because of this
1298                  * and the AP does move then we'll just end up taking a
1299                  * beacon miss and scan to find the AP.
1300                  *
1301                  * XXX may want <= on count as we also process ProbeResp
1302                  * frames and those may come in w/ the same count as the
1303                  * previous beacon; but doing so leaves us open to a stuck
1304                  * count until we add a dead-man timer
1305                  */
1306                 if (!(csa->csa_count < ic->ic_csa_count &&
1307                       csa->csa_mode == ic->ic_csa_mode &&
1308                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1309                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1310                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1311                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1312                             ic->ic_csa_newchan, ic->ic_csa_count,
1313                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1314                         ieee80211_csa_cancelswitch(ic);
1315                 } else {
1316                         if (csa->csa_count <= 1)
1317                                 ieee80211_csa_completeswitch(ic);
1318                         else
1319                                 ic->ic_csa_count = csa->csa_count;
1320                 }
1321         }
1322 done:
1323         IEEE80211_UNLOCK(ic);
1324 }
1325
1326 /*
1327  * Return non-zero if a background scan may be continued:
1328  * o bg scan is active
1329  * o no channel switch is pending
1330  * o there has not been any traffic recently
1331  * o no full-offload scan support (no need for explicitly continuing scan then)
1332  *
1333  * Note we do not check if there is an administrative enable;
1334  * this is only done to start the scan.  We assume that any
1335  * change in state will be accompanied by a request to cancel
1336  * active scans which will otherwise cause this test to fail.
1337  */
1338 static __inline int
1339 contbgscan(struct ieee80211vap *vap)
1340 {
1341         struct ieee80211com *ic = vap->iv_ic;
1342
1343         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1344             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1345             !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) &&
1346             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1347             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1348 }
1349
1350 /*
1351  * Return non-zero if a backgrond scan may be started:
1352  * o bg scanning is administratively enabled
1353  * o no channel switch is pending
1354  * o we are not boosted on a dynamic turbo channel
1355  * o there has not been a scan recently
1356  * o there has not been any traffic recently (don't check if full-offload scan)
1357  */
1358 static __inline int
1359 startbgscan(struct ieee80211vap *vap)
1360 {
1361         struct ieee80211com *ic = vap->iv_ic;
1362
1363         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1364             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1365 #ifdef IEEE80211_SUPPORT_SUPERG
1366             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1367 #endif
1368             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1369             ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) ||
1370              ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)));
1371 }
1372
1373 #ifdef  notyet
1374 /*
1375  * Compare two quiet IEs and return if they are equivalent.
1376  *
1377  * The tbttcount isnt checked - that's not part of the configuration.
1378  */
1379 static int
1380 compare_quiet_ie(const struct ieee80211_quiet_ie *q1,
1381     const struct ieee80211_quiet_ie *q2)
1382 {
1383
1384         if (q1->period != q2->period)
1385                 return (0);
1386         if (le16dec(&q1->duration) != le16dec(&q2->duration))
1387                 return (0);
1388         if (le16dec(&q1->offset) != le16dec(&q2->offset))
1389                 return (0);
1390         return (1);
1391 }
1392 #endif
1393
1394 static void
1395 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1396     const struct ieee80211_rx_stats *rxs,
1397     int rssi, int nf)
1398 {
1399 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1400         struct ieee80211vap *vap = ni->ni_vap;
1401         struct ieee80211com *ic = ni->ni_ic;
1402         struct ieee80211_channel *rxchan = ic->ic_curchan;
1403         struct ieee80211_frame *wh;
1404         int ht_state_change = 0, do_ht = 0;
1405         uint8_t *frm, *efrm;
1406         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1407         uint8_t *vhtcap, *vhtopmode;
1408         uint8_t rate;
1409         uint8_t qosinfo;
1410
1411         wh = mtod(m0, struct ieee80211_frame *);
1412         frm = (uint8_t *)&wh[1];
1413         efrm = mtod(m0, uint8_t *) + m0->m_len;
1414         switch (subtype) {
1415         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1416         case IEEE80211_FC0_SUBTYPE_BEACON: {
1417                 struct ieee80211_scanparams scan;
1418                 struct ieee80211_channel *c;
1419                 /*
1420                  * We process beacon/probe response frames:
1421                  *    o when scanning, or
1422                  *    o station mode when associated (to collect state
1423                  *      updates such as 802.11g slot time)
1424                  * Frames otherwise received are discarded.
1425                  */
1426                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1427                         vap->iv_stats.is_rx_mgtdiscard++;
1428                         return;
1429                 }
1430
1431                 /* Override RX channel as appropriate */
1432                 if (rxs != NULL) {
1433                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1434                         if (c != NULL)
1435                                 rxchan = c;
1436                 }
1437
1438                 /* XXX probe response in sta mode when !scanning? */
1439                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1440                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1441                                 vap->iv_stats.is_beacon_bad++;
1442                         return;
1443                 }
1444
1445                 /*
1446                  * Count frame now that we know it's to be processed.
1447                  */
1448                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1449                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1450                         IEEE80211_NODE_STAT(ni, rx_beacons);
1451                 } else
1452                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1453                 /*
1454                  * When operating in station mode, check for state updates.
1455                  * Be careful to ignore beacons received while doing a
1456                  * background scan.  We consider only 11g/WMM stuff right now.
1457                  */
1458                 if (ni->ni_associd != 0 &&
1459                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1460                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1461                         /* record tsf of last beacon */
1462                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1463                                 sizeof(ni->ni_tstamp));
1464                         /* count beacon frame for s/w bmiss handling */
1465                         vap->iv_swbmiss_count++;
1466                         vap->iv_bmiss_count = 0;
1467                         if (ni->ni_erp != scan.erp) {
1468                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1469                                     wh->i_addr2,
1470                                     "erp change: was 0x%x, now 0x%x",
1471                                     ni->ni_erp, scan.erp);
1472                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1473                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1474                                         vap->iv_flags |= IEEE80211_F_USEPROT;
1475                                 else
1476                                         vap->iv_flags &= ~IEEE80211_F_USEPROT;
1477                                 ni->ni_erp = scan.erp;
1478                                 /* XXX statistic */
1479                                 /* driver notification */
1480                                 ieee80211_vap_update_erp_protmode(vap);
1481                         }
1482                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1483                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1484                                     wh->i_addr2,
1485                                     "capabilities change: was 0x%x, now 0x%x",
1486                                     ni->ni_capinfo, scan.capinfo);
1487                                 /*
1488                                  * NB: we assume short preamble doesn't
1489                                  *     change dynamically
1490                                  */
1491                                 ieee80211_vap_set_shortslottime(vap,
1492                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1493                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1494                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1495                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1496                                 /* XXX statistic */
1497                         }
1498                         if (scan.wme != NULL &&
1499                             (ni->ni_flags & IEEE80211_NODE_QOS)) {
1500                                 int _retval;
1501                                 if ((_retval = ieee80211_parse_wmeparams(vap,
1502                                     scan.wme, wh, &qosinfo)) >= 0) {
1503                                         if (qosinfo & WME_CAPINFO_UAPSD_EN)
1504                                                 ni->ni_flags |=
1505                                                     IEEE80211_NODE_UAPSD;
1506                                         if (_retval > 0)
1507                                                 ieee80211_wme_updateparams(vap);
1508                                 }
1509                         } else
1510                                 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
1511 #ifdef IEEE80211_SUPPORT_SUPERG
1512                         if (scan.ath != NULL)
1513                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1514 #endif
1515                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1516                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1517                                 /* XXX state changes? */
1518                                 ieee80211_ht_updateparams(ni,
1519                                     scan.htcap, scan.htinfo);
1520                                 do_ht = 1;
1521                         }
1522                         if (scan.vhtcap != NULL && scan.vhtopmode != NULL &&
1523                             (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) {
1524                                 /* XXX state changes? */
1525                                 ieee80211_vht_updateparams(ni,
1526                                     scan.vhtcap, scan.vhtopmode);
1527                                 do_ht = 1;
1528                         }
1529                         if (do_ht) {
1530                                 if (ieee80211_ht_updateparams_final(ni,
1531                                     scan.htcap, scan.htinfo))
1532                                         ht_state_change = 1;
1533                         }
1534
1535                         /*
1536                          * If we have a quiet time IE then report it up to
1537                          * the driver.
1538                          *
1539                          * Otherwise, inform the driver that the quiet time
1540                          * IE has disappeared - only do that once rather than
1541                          * spamming it each time.
1542                          */
1543                         if (scan.quiet) {
1544                                 ic->ic_set_quiet(ni, scan.quiet);
1545                                 ni->ni_quiet_ie_set = 1;
1546                                 memcpy(&ni->ni_quiet_ie, scan.quiet,
1547                                     sizeof(struct ieee80211_quiet_ie));
1548                         } else {
1549                                 if (ni->ni_quiet_ie_set == 1)
1550                                         ic->ic_set_quiet(ni, NULL);
1551                                 ni->ni_quiet_ie_set = 0;
1552                                 bzero(&ni->ni_quiet_ie,
1553                                     sizeof(struct ieee80211_quiet_ie));
1554                         }
1555
1556                         if (scan.tim != NULL) {
1557                                 struct ieee80211_tim_ie *tim =
1558                                     (struct ieee80211_tim_ie *) scan.tim;
1559                                 /*
1560                                  * XXX Check/debug this code; see if it's about
1561                                  * the right time to force the VAP awake if we
1562                                  * receive a frame destined for us?
1563                                  */
1564                                 int aid = IEEE80211_AID(ni->ni_associd);
1565                                 int ix = aid / NBBY;
1566                                 int min = tim->tim_bitctl &~ 1;
1567                                 int max = tim->tim_len + min - 4;
1568                                 int tim_ucast = 0;
1569 #ifdef __notyet__
1570                                 int tim_mcast = 0;
1571 #endif
1572
1573                                 /*
1574                                  * Only do this for unicast traffic in the TIM
1575                                  * The multicast traffic notification for
1576                                  * the scan notification stuff should occur
1577                                  * differently.
1578                                  */
1579                                 if (min <= ix && ix <= max &&
1580                                      isset(tim->tim_bitmap - min, aid)) {
1581                                         tim_ucast = 1;
1582                                 }
1583
1584 #ifdef __notyet__
1585                                 /*
1586                                  * Do a separate notification
1587                                  * for the multicast bit being set.
1588                                  */
1589                                 if (tim->tim_bitctl & 1) {
1590                                         tim_mcast = 1;
1591                                 }
1592 #endif
1593
1594                                 /*
1595                                  * If the TIM indicates there's traffic for
1596                                  * us then get us out of STA mode powersave.
1597                                  */
1598                                 if (tim_ucast == 1) {
1599                                         /*
1600                                          * Wake us out of SLEEP state if we're
1601                                          * in it; and if we're doing bgscan
1602                                          * then wake us out of STA powersave.
1603                                          */
1604                                         ieee80211_sta_tim_notify(vap, 1);
1605
1606                                         /*
1607                                          * This is preventing us from
1608                                          * continuing a bgscan; because it
1609                                          * tricks the contbgscan()
1610                                          * routine to think there's always
1611                                          * traffic for us.
1612                                          *
1613                                          * I think we need both an RX and
1614                                          * TX ic_lastdata field.
1615                                          */
1616                                         ic->ic_lastdata = ticks;
1617                                 }
1618
1619                                 ni->ni_dtim_count = tim->tim_count;
1620                                 ni->ni_dtim_period = tim->tim_period;
1621                         }
1622                         if (scan.csa != NULL &&
1623                             (vap->iv_flags & IEEE80211_F_DOTH))
1624                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1625                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1626                                 /*
1627                                  * No CSA ie or 11h disabled, but a channel
1628                                  * switch is pending; drop out so we aren't
1629                                  * stuck in CSA state.  If the AP really is
1630                                  * moving we'll get a beacon miss and scan.
1631                                  */
1632                                 IEEE80211_LOCK(ic);
1633                                 ieee80211_csa_cancelswitch(ic);
1634                                 IEEE80211_UNLOCK(ic);
1635                         }
1636                         /*
1637                          * If scanning, pass the info to the scan module.
1638                          * Otherwise, check if it's the right time to do
1639                          * a background scan.  Background scanning must
1640                          * be enabled and we must not be operating in the
1641                          * turbo phase of dynamic turbo mode.  Then,
1642                          * it's been a while since the last background
1643                          * scan and if no data frames have come through
1644                          * recently, kick off a scan.  Note that this
1645                          * is the mechanism by which a background scan
1646                          * is started _and_ continued each time we
1647                          * return on-channel to receive a beacon from
1648                          * our ap.
1649                          */
1650                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1651                                 ieee80211_add_scan(vap, rxchan,
1652                                     &scan, wh, subtype, rssi, nf);
1653                         } else if (contbgscan(vap)) {
1654                                 ieee80211_bg_scan(vap, 0);
1655                         } else if (startbgscan(vap)) {
1656                                 vap->iv_stats.is_scan_bg++;
1657 #if 0
1658                                 /* wakeup if we are sleeing */
1659                                 ieee80211_set_pwrsave(vap, 0);
1660 #endif
1661                                 ieee80211_bg_scan(vap, 0);
1662                         }
1663
1664                         /*
1665                          * Put the station to sleep if we haven't seen
1666                          * traffic in a while.
1667                          */
1668                         IEEE80211_LOCK(ic);
1669                         ieee80211_sta_ps_timer_check(vap);
1670                         IEEE80211_UNLOCK(ic);
1671
1672                         /*
1673                          * If we've had a channel width change (eg HT20<->HT40)
1674                          * then schedule a delayed driver notification.
1675                          */
1676                         if (ht_state_change)
1677                                 ieee80211_update_chw(ic);
1678                         return;
1679                 }
1680                 /*
1681                  * If scanning, just pass information to the scan module.
1682                  */
1683                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1684                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1685                                 /*
1686                                  * Actively scanning a channel marked passive;
1687                                  * send a probe request now that we know there
1688                                  * is 802.11 traffic present.
1689                                  *
1690                                  * XXX check if the beacon we recv'd gives
1691                                  * us what we need and suppress the probe req
1692                                  */
1693                                 ieee80211_probe_curchan(vap, 1);
1694                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1695                         }
1696                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1697                             subtype, rssi, nf);
1698                         return;
1699                 }
1700                 break;
1701         }
1702
1703         case IEEE80211_FC0_SUBTYPE_AUTH: {
1704                 uint16_t algo, seq, status;
1705                 /*
1706                  * auth frame format
1707                  *      [2] algorithm
1708                  *      [2] sequence
1709                  *      [2] status
1710                  *      [tlv*] challenge
1711                  */
1712                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1713                 algo   = le16toh(*(uint16_t *)frm);
1714                 seq    = le16toh(*(uint16_t *)(frm + 2));
1715                 status = le16toh(*(uint16_t *)(frm + 4));
1716                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1717                     "recv auth frame with algorithm %d seq %d", algo, seq);
1718
1719                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1720                         IEEE80211_DISCARD(vap,
1721                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1722                             wh, "auth", "%s", "TKIP countermeasures enabled");
1723                         vap->iv_stats.is_rx_auth_countermeasures++;
1724                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1725                                 ieee80211_send_error(ni, wh->i_addr2,
1726                                         IEEE80211_FC0_SUBTYPE_AUTH,
1727                                         IEEE80211_REASON_MIC_FAILURE);
1728                         }
1729                         return;
1730                 }
1731                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1732                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1733                             seq, status);
1734                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1735                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1736                 else {
1737                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1738                             wh, "auth", "unsupported alg %d", algo);
1739                         vap->iv_stats.is_rx_auth_unsupported++;
1740                         return;
1741                 }
1742                 break;
1743         }
1744
1745         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1746         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1747                 uint16_t capinfo, associd;
1748                 uint16_t status;
1749
1750                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1751                         vap->iv_stats.is_rx_mgtdiscard++;
1752                         return;
1753                 }
1754
1755                 /*
1756                  * asresp frame format
1757                  *      [2] capability information
1758                  *      [2] status
1759                  *      [2] association ID
1760                  *      [tlv] supported rates
1761                  *      [tlv] extended supported rates
1762                  *      [tlv] WME
1763                  *      [tlv] HT capabilities
1764                  *      [tlv] HT info
1765                  */
1766                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1767                 ni = vap->iv_bss;
1768                 capinfo = le16toh(*(uint16_t *)frm);
1769                 frm += 2;
1770                 status = le16toh(*(uint16_t *)frm);
1771                 frm += 2;
1772                 if (status != 0) {
1773                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1774                             wh->i_addr2, "%sassoc failed (reason %d)",
1775                             ISREASSOC(subtype) ?  "re" : "", status);
1776                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1777                         return;
1778                 }
1779                 associd = le16toh(*(uint16_t *)frm);
1780                 frm += 2;
1781
1782                 rates = xrates = wme = htcap = htinfo = NULL;
1783                 vhtcap = vhtopmode = NULL;
1784                 while (efrm - frm > 1) {
1785                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1786                         switch (*frm) {
1787                         case IEEE80211_ELEMID_RATES:
1788                                 rates = frm;
1789                                 break;
1790                         case IEEE80211_ELEMID_XRATES:
1791                                 xrates = frm;
1792                                 break;
1793                         case IEEE80211_ELEMID_HTCAP:
1794                                 htcap = frm;
1795                                 break;
1796                         case IEEE80211_ELEMID_HTINFO:
1797                                 htinfo = frm;
1798                                 break;
1799                         case IEEE80211_ELEMID_VENDOR:
1800                                 if (iswmeoui(frm))
1801                                         wme = frm;
1802                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1803                                         /*
1804                                          * Accept pre-draft HT ie's if the
1805                                          * standard ones have not been seen.
1806                                          */
1807                                         if (ishtcapoui(frm)) {
1808                                                 if (htcap == NULL)
1809                                                         htcap = frm;
1810                                         } else if (ishtinfooui(frm)) {
1811                                                 if (htinfo == NULL)
1812                                                         htinfo = frm;
1813                                         }
1814                                 }
1815                                 /* XXX Atheros OUI support */
1816                                 break;
1817                         case IEEE80211_ELEMID_VHT_CAP:
1818                                 vhtcap = frm;
1819                                 break;
1820                         case IEEE80211_ELEMID_VHT_OPMODE:
1821                                 vhtopmode = frm;
1822                                 break;
1823                         }
1824                         frm += frm[1] + 2;
1825                 }
1826
1827                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1828                 if (xrates != NULL)
1829                         IEEE80211_VERIFY_ELEMENT(xrates,
1830                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1831                 rate = ieee80211_setup_rates(ni, rates, xrates,
1832                                 IEEE80211_F_JOIN |
1833                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1834                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1835                 if (rate & IEEE80211_RATE_BASIC) {
1836                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1837                             wh->i_addr2,
1838                             "%sassoc failed (rate set mismatch)",
1839                             ISREASSOC(subtype) ?  "re" : "");
1840                         vap->iv_stats.is_rx_assoc_norate++;
1841                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1842                             IEEE80211_SCAN_FAIL_STATUS);
1843                         return;
1844                 }
1845
1846                 ni->ni_capinfo = capinfo;
1847                 ni->ni_associd = associd;
1848                 if (ni->ni_jointime == 0)
1849                         ni->ni_jointime = time_uptime;
1850                 if (wme != NULL &&
1851                     ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) {
1852                         ni->ni_flags |= IEEE80211_NODE_QOS;
1853                         ieee80211_wme_updateparams(vap);
1854                 } else
1855                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1856                 /*
1857                  * Setup HT state according to the negotiation.
1858                  *
1859                  * NB: shouldn't need to check if HT use is enabled but some
1860                  *     ap's send back HT ie's even when we don't indicate we
1861                  *     are HT capable in our AssocReq.
1862                  */
1863                 if (htcap != NULL && htinfo != NULL &&
1864                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1865                         ieee80211_ht_node_init(ni);
1866                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1867
1868                         if ((vhtcap != NULL) && (vhtopmode != NULL) &
1869                             (vap->iv_vht_flags & IEEE80211_FVHT_VHT)) {
1870                                 /*
1871                                  * Log if we get a VHT assoc/reassoc response.
1872                                  * We aren't ready for 2GHz VHT support.
1873                                  */
1874                                 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1875                                         printf("%s: peer %6D: VHT on 2GHz, ignoring\n",
1876                                             __func__,
1877                                             ni->ni_macaddr,
1878                                             ":");
1879                                 } else {
1880                                         ieee80211_vht_node_init(ni);
1881                                         ieee80211_vht_updateparams(ni, vhtcap, vhtopmode);
1882                                         ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode);
1883                                 }
1884                         }
1885
1886                         ieee80211_ht_updateparams_final(ni, htcap, htinfo);
1887                         ieee80211_setup_htrates(ni, htcap,
1888                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1889                         ieee80211_setup_basic_htrates(ni, htinfo);
1890
1891                         ieee80211_node_setuptxparms(ni);
1892                         ieee80211_ratectl_node_init(ni);
1893                 }
1894
1895                 /*
1896                  * Always initialise FF/superg state; we can use this
1897                  * for doing A-MSDU encapsulation as well.
1898                  */
1899 #ifdef  IEEE80211_SUPPORT_SUPERG
1900                 ieee80211_ff_node_init(ni);
1901 #endif
1902
1903                 /*
1904                  * Configure state now that we are associated.
1905                  *
1906                  * XXX may need different/additional driver callbacks?
1907                  */
1908                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1909                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1910                         vap->iv_flags |= IEEE80211_F_SHPREAMBLE;
1911                         vap->iv_flags &= ~IEEE80211_F_USEBARKER;
1912                 } else {
1913                         vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE;
1914                         vap->iv_flags |= IEEE80211_F_USEBARKER;
1915                 }
1916                 ieee80211_vap_set_shortslottime(vap,
1917                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1918                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1919                 ieee80211_vap_update_preamble(vap);
1920                 /*
1921                  * Honor ERP protection.
1922                  *
1923                  * NB: ni_erp should zero for non-11g operation.
1924                  */
1925                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1926                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1927                         vap->iv_flags |= IEEE80211_F_USEPROT;
1928                 else
1929                         vap->iv_flags &= ~IEEE80211_F_USEPROT;
1930                 ieee80211_vap_update_erp_protmode(vap);
1931                 IEEE80211_NOTE_MAC(vap,
1932                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1933                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s",
1934                     ISREASSOC(subtype) ? "re" : "",
1935                     IEEE80211_NODE_AID(ni),
1936                     vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1937                     vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1938                     vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1939                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1940                     ni->ni_flags & IEEE80211_NODE_HT ?
1941                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1942                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1943                     ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "",
1944                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1945                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1946                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1947                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1948                         ", fast-frames" : "",
1949                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1950                         ", turbo" : ""
1951                 );
1952                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1953                 break;
1954         }
1955
1956         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1957                 uint16_t reason;
1958
1959                 if (vap->iv_state == IEEE80211_S_SCAN) {
1960                         vap->iv_stats.is_rx_mgtdiscard++;
1961                         return;
1962                 }
1963                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1964                         /* NB: can happen when in promiscuous mode */
1965                         vap->iv_stats.is_rx_mgtdiscard++;
1966                         break;
1967                 }
1968
1969                 /*
1970                  * deauth frame format
1971                  *      [2] reason
1972                  */
1973                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1974                 reason = le16toh(*(uint16_t *)frm);
1975
1976                 vap->iv_stats.is_rx_deauth++;
1977                 vap->iv_stats.is_rx_deauth_code = reason;
1978                 IEEE80211_NODE_STAT(ni, rx_deauth);
1979
1980                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1981                     "recv deauthenticate (reason: %d (%s))", reason,
1982                     ieee80211_reason_to_string(reason));
1983                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1984                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1985                 break;
1986         }
1987
1988         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1989                 uint16_t reason;
1990
1991                 if (vap->iv_state != IEEE80211_S_RUN &&
1992                     vap->iv_state != IEEE80211_S_ASSOC &&
1993                     vap->iv_state != IEEE80211_S_AUTH) {
1994                         vap->iv_stats.is_rx_mgtdiscard++;
1995                         return;
1996                 }
1997                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1998                         /* NB: can happen when in promiscuous mode */
1999                         vap->iv_stats.is_rx_mgtdiscard++;
2000                         break;
2001                 }
2002
2003                 /*
2004                  * disassoc frame format
2005                  *      [2] reason
2006                  */
2007                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2008                 reason = le16toh(*(uint16_t *)frm);
2009
2010                 vap->iv_stats.is_rx_disassoc++;
2011                 vap->iv_stats.is_rx_disassoc_code = reason;
2012                 IEEE80211_NODE_STAT(ni, rx_disassoc);
2013
2014                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2015                     "recv disassociate (reason: %d (%s))", reason,
2016                     ieee80211_reason_to_string(reason));
2017                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
2018                 break;
2019         }
2020
2021         case IEEE80211_FC0_SUBTYPE_ACTION:
2022         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2023                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2024                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2025                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2026                             wh, NULL, "%s", "not for us");
2027                         vap->iv_stats.is_rx_mgtdiscard++;
2028                 } else if (vap->iv_state != IEEE80211_S_RUN) {
2029                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2030                             wh, NULL, "wrong state %s",
2031                             ieee80211_state_name[vap->iv_state]);
2032                         vap->iv_stats.is_rx_mgtdiscard++;
2033                 } else {
2034                         if (ieee80211_parse_action(ni, m0) == 0)
2035                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2036                 }
2037                 break;
2038
2039         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2040         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2041         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
2042         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2043         case IEEE80211_FC0_SUBTYPE_ATIM:
2044                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2045                     wh, NULL, "%s", "not handled");
2046                 vap->iv_stats.is_rx_mgtdiscard++;
2047                 break;
2048
2049         default:
2050                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2051                     wh, "mgt", "subtype 0x%x not handled", subtype);
2052                 vap->iv_stats.is_rx_badsubtype++;
2053                 break;
2054         }
2055 #undef ISREASSOC
2056 }
2057
2058 static void
2059 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2060 {
2061         switch (subtype) {
2062         case IEEE80211_FC0_SUBTYPE_BAR:
2063                 ieee80211_recv_bar(ni, m);
2064                 break;
2065         }
2066 }