sys/net80211/ieee80211_sta.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifdef __FreeBSD__
  30 __FBSDID("$FreeBSD$");
  31 #endif
  32
  33 /*
  34  * IEEE 802.11 Station mode support.
  35  */
  36 #include "opt_inet.h"
  37 #include "opt_wlan.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/malloc.h>
  43 #include <sys/kernel.h>
  44
  45 #include <sys/socket.h>
  46 #include <sys/sockio.h>
  47 #include <sys/endian.h>
  48 #include <sys/errno.h>
  49 #include <sys/proc.h>
  50 #include <sys/sysctl.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_media.h>
  54 #include <net/if_llc.h>
  55 #include <net/if_dl.h>
  56 #include <net/if_var.h>
  57 #include <net/ethernet.h>
  58
  59 #include <net/bpf.h>
  60
  61 #include <net80211/ieee80211_var.h>
  62 #include <net80211/ieee80211_sta.h>
  63 #include <net80211/ieee80211_input.h>
  64 #ifdef IEEE80211_SUPPORT_SUPERG
  65 #include <net80211/ieee80211_superg.h>
  66 #endif
  67 #include <net80211/ieee80211_ratectl.h>
  68 #include <net80211/ieee80211_sta.h>
  69 #include <net80211/ieee80211_vht.h>
  70
  71 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  72
  73 static  void sta_vattach(struct ieee80211vap *);
  74 static  void sta_beacon_miss(struct ieee80211vap *);
  75 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  76 static  int sta_input(struct ieee80211_node *, struct mbuf *,
  77             const struct ieee80211_rx_stats *, int, int);
  78 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  79             int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
  80 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  81
  82 void
  83 ieee80211_sta_attach(struct ieee80211com *ic)
  84 {
  85         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  86 }
  87
  88 void
  89 ieee80211_sta_detach(struct ieee80211com *ic)
  90 {
  91 }
  92
  93 static void
  94 sta_vdetach(struct ieee80211vap *vap)
  95 {
  96 }
  97
  98 static void
  99 sta_vattach(struct ieee80211vap *vap)
 100 {
 101         vap->iv_newstate = sta_newstate;
 102         vap->iv_input = sta_input;
 103         vap->iv_recv_mgmt = sta_recv_mgmt;
 104         vap->iv_recv_ctl = sta_recv_ctl;
 105         vap->iv_opdetach = sta_vdetach;
 106         vap->iv_bmiss = sta_beacon_miss;
 107 }
 108
 109 /*
 110  * Handle a beacon miss event.  The common code filters out
 111  * spurious events that can happen when scanning and/or before
 112  * reaching RUN state.
 113  */
 114 static void
 115 sta_beacon_miss(struct ieee80211vap *vap)
 116 {
 117         struct ieee80211com *ic = vap->iv_ic;
 118
 119         IEEE80211_LOCK_ASSERT(ic);
 120
 121         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 122         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 123             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 124
 125         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 126             "beacon miss, mode %s state %s\n",
 127             ieee80211_opmode_name[vap->iv_opmode],
 128             ieee80211_state_name[vap->iv_state]);
 129
 130         if (vap->iv_state == IEEE80211_S_CSA) {
 131                 /*
 132                  * A Channel Switch is pending; assume we missed the
 133                  * beacon that would've completed the process and just
 134                  * force the switch.  If we made a mistake we'll not
 135                  * find the AP on the new channel and fall back to a
 136                  * normal scan.
 137                  */
 138                 ieee80211_csa_completeswitch(ic);
 139                 return;
 140         }
 141         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 142                 /*
 143                  * Send a directed probe req before falling back to a
 144                  * scan; if we receive a response ic_bmiss_count will
 145                  * be reset.  Some cards mistakenly report beacon miss
 146                  * so this avoids the expensive scan if the ap is
 147                  * still there.
 148                  */
 149                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 150                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 151                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 152                 return;
 153         }
 154
 155         callout_stop(&vap->iv_swbmiss);
 156         vap->iv_bmiss_count = 0;
 157         vap->iv_stats.is_beacon_miss++;
 158         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 159 #ifdef IEEE80211_SUPPORT_SUPERG
 160
 161                 /*
 162                  * If we receive a beacon miss interrupt when using
 163                  * dynamic turbo, attempt to switch modes before
 164                  * reassociating.
 165                  */
 166                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 167                         ieee80211_dturbo_switch(vap,
 168                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 169 #endif
 170                 /*
 171                  * Try to reassociate before scanning for a new ap.
 172                  */
 173                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 174         } else {
 175                 /*
 176                  * Somebody else is controlling state changes (e.g.
 177                  * a user-mode app) don't do anything that would
 178                  * confuse them; just drop into scan mode so they'll
 179                  * notified of the state change and given control.
 180                  */
 181                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 182         }
 183 }
 184
 185 /*
 186  * Handle deauth with reason.  We retry only for
 187  * the cases where we might succeed.  Otherwise
 188  * we downgrade the ap and scan.
 189  */
 190 static void
 191 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 192 {
 193         switch (reason) {
 194         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 195         case IEEE80211_STATUS_TIMEOUT:
 196         case IEEE80211_REASON_ASSOC_EXPIRE:
 197         case IEEE80211_REASON_NOT_AUTHED:
 198         case IEEE80211_REASON_NOT_ASSOCED:
 199         case IEEE80211_REASON_ASSOC_LEAVE:
 200         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 201                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 202                 break;
 203         default:
 204                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 205                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 206                         ieee80211_check_scan_current(vap);
 207                 break;
 208         }
 209 }
 210
 211 static void
 212 sta_swbmiss_start(struct ieee80211vap *vap)
 213 {
 214
 215         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
 216                 /*
 217                  * Start s/w beacon miss timer for devices w/o
 218                  * hardware support.  We fudge a bit here since
 219                  * we're doing this in software.
 220                  */
 221                 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 222                     2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
 223                 vap->iv_swbmiss_count = 0;
 224                 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 225                     ieee80211_swbmiss, vap);
 226         }
 227 }
 228
 229 /*
 230  * IEEE80211_M_STA vap state machine handler.
 231  * This routine handles the main states in the 802.11 protocol.
 232  */
 233 static int
 234 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 235 {
 236         struct ieee80211com *ic = vap->iv_ic;
 237         struct ieee80211_node *ni;
 238         enum ieee80211_state ostate;
 239
 240         IEEE80211_LOCK_ASSERT(ic);
 241
 242         ostate = vap->iv_state;
 243         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 244             __func__, ieee80211_state_name[ostate],
 245             ieee80211_state_name[nstate], arg);
 246         vap->iv_state = nstate;                 /* state transition */
 247         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 248         if (ostate != IEEE80211_S_SCAN)
 249                 ieee80211_cancel_scan(vap);     /* background scan */
 250         ni = vap->iv_bss;                       /* NB: no reference held */
 251         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 252                 callout_stop(&vap->iv_swbmiss);
 253         switch (nstate) {
 254         case IEEE80211_S_INIT:
 255                 switch (ostate) {
 256                 case IEEE80211_S_SLEEP:
 257                         /* XXX wakeup */
 258                         /* XXX driver hook to wakeup the hardware? */
 259                 case IEEE80211_S_RUN:
 260                         IEEE80211_SEND_MGMT(ni,
 261                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 262                             IEEE80211_REASON_ASSOC_LEAVE);
 263                         ieee80211_sta_leave(ni);
 264                         break;
 265                 case IEEE80211_S_ASSOC:
 266                         IEEE80211_SEND_MGMT(ni,
 267                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 268                             IEEE80211_REASON_AUTH_LEAVE);
 269                         break;
 270                 case IEEE80211_S_SCAN:
 271                         ieee80211_cancel_scan(vap);
 272                         break;
 273                 default:
 274                         break;
 275                 }
 276                 if (ostate != IEEE80211_S_INIT) {
 277                         /* NB: optimize INIT -> INIT case */
 278                         ieee80211_reset_bss(vap);
 279                 }
 280                 if (vap->iv_auth->ia_detach != NULL)
 281                         vap->iv_auth->ia_detach(vap);
 282                 break;
 283         case IEEE80211_S_SCAN:
 284                 switch (ostate) {
 285                 case IEEE80211_S_INIT:
 286                         /*
 287                          * Initiate a scan.  We can come here as a result
 288                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 289                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 290                          * and the scan request parameters will be present
 291                          * in iv_scanreq.  Otherwise we do the default.
 292                          */
 293                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 294                                 ieee80211_check_scan(vap,
 295                                     vap->iv_scanreq_flags,
 296                                     vap->iv_scanreq_duration,
 297                                     vap->iv_scanreq_mindwell,
 298                                     vap->iv_scanreq_maxdwell,
 299                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 300                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 301                         } else
 302                                 ieee80211_check_scan_current(vap);
 303                         break;
 304                 case IEEE80211_S_SCAN:
 305                 case IEEE80211_S_AUTH:
 306                 case IEEE80211_S_ASSOC:
 307                         /*
 308                          * These can happen either because of a timeout
 309                          * on an assoc/auth response or because of a
 310                          * change in state that requires a reset.  For
 311                          * the former we're called with a non-zero arg
 312                          * that is the cause for the failure; pass this
 313                          * to the scan code so it can update state.
 314                          * Otherwise trigger a new scan unless we're in
 315                          * manual roaming mode in which case an application
 316                          * must issue an explicit scan request.
 317                          */
 318                         if (arg != 0)
 319                                 ieee80211_scan_assoc_fail(vap,
 320                                         vap->iv_bss->ni_macaddr, arg);
 321                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 322                                 ieee80211_check_scan_current(vap);
 323                         break;
 324                 case IEEE80211_S_SLEEP:         /* beacon miss */
 325                         /*
 326                          * XXX if in sleep we need to wakeup the hardware.
 327                          */
 328                         /* FALLTHROUGH */
 329                 case IEEE80211_S_RUN:           /* beacon miss */
 330                         /*
 331                          * Beacon miss.  Notify user space and if not
 332                          * under control of a user application (roaming
 333                          * manual) kick off a scan to re-connect.
 334                          */
 335
 336                         ieee80211_sta_leave(ni);
 337                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 338                                 ieee80211_check_scan_current(vap);
 339                         break;
 340                 default:
 341                         goto invalid;
 342                 }
 343                 break;
 344         case IEEE80211_S_AUTH:
 345                 switch (ostate) {
 346                 case IEEE80211_S_INIT:
 347                 case IEEE80211_S_SCAN:
 348                         IEEE80211_SEND_MGMT(ni,
 349                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 350                         break;
 351                 case IEEE80211_S_AUTH:
 352                 case IEEE80211_S_ASSOC:
 353                         switch (arg & 0xff) {
 354                         case IEEE80211_FC0_SUBTYPE_AUTH:
 355                                 /* ??? */
 356                                 IEEE80211_SEND_MGMT(ni,
 357                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 358                                 break;
 359                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 360                                 sta_authretry(vap, ni, arg>>8);
 361                                 break;
 362                         }
 363                         break;
 364                 case IEEE80211_S_SLEEP:
 365                 case IEEE80211_S_RUN:
 366                         switch (arg & 0xff) {
 367                         case IEEE80211_FC0_SUBTYPE_AUTH:
 368                                 IEEE80211_SEND_MGMT(ni,
 369                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 370                                 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
 371                                 break;
 372                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 373                                 ieee80211_sta_leave(ni);
 374                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 375                                         /* try to reauth */
 376                                         IEEE80211_SEND_MGMT(ni,
 377                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 378                                 }
 379                                 break;
 380                         }
 381                         break;
 382                 default:
 383                         goto invalid;
 384                 }
 385                 break;
 386         case IEEE80211_S_ASSOC:
 387                 switch (ostate) {
 388                 case IEEE80211_S_AUTH:
 389                 case IEEE80211_S_ASSOC:
 390                         IEEE80211_SEND_MGMT(ni,
 391                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 392                         break;
 393                 case IEEE80211_S_SLEEP:         /* cannot happen */
 394                 case IEEE80211_S_RUN:
 395                         ieee80211_sta_leave(ni);
 396                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 397                                 IEEE80211_SEND_MGMT(ni, arg ?
 398                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 399                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 400                         }
 401                         break;
 402                 default:
 403                         goto invalid;
 404                 }
 405                 break;
 406         case IEEE80211_S_RUN:
 407                 if (vap->iv_flags & IEEE80211_F_WPA) {
 408                         /* XXX validate prerequisites */
 409                 }
 410                 switch (ostate) {
 411                 case IEEE80211_S_RUN:
 412                 case IEEE80211_S_CSA:
 413                         break;
 414                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 415                 case IEEE80211_S_ASSOC:
 416 #ifdef IEEE80211_DEBUG
 417                         if (ieee80211_msg_debug(vap)) {
 418                                 ieee80211_note(vap, "%s with %s ssid ",
 419                                     (vap->iv_opmode == IEEE80211_M_STA ?
 420                                     "associated" : "synchronized"),
 421                                     ether_sprintf(ni->ni_bssid));
 422                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 423                                     ni->ni_esslen);
 424                                 /* XXX MCS/HT */
 425                                 printf(" channel %d start %uMb\n",
 426                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 427                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 428                         }
 429 #endif
 430                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 431                         ieee80211_notify_node_join(ni,
 432                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 433                         break;
 434                 case IEEE80211_S_SLEEP:
 435                         /* Wake up from sleep */
 436                         vap->iv_sta_ps(vap, 0);
 437                         break;
 438                 default:
 439                         goto invalid;
 440                 }
 441                 ieee80211_sync_curchan(ic);
 442                 if (ostate != IEEE80211_S_RUN)
 443                         sta_swbmiss_start(vap);
 444                 /*
 445                  * When 802.1x is not in use mark the port authorized
 446                  * at this point so traffic can flow.
 447                  */
 448                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 449                         ieee80211_node_authorize(ni);
 450                 /*
 451                  * Fake association when joining an existing bss.
 452                  *
 453                  * Don't do this if we're doing SLEEP->RUN.
 454                  */
 455                 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
 456                         ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
 457                 break;
 458         case IEEE80211_S_CSA:
 459                 if (ostate != IEEE80211_S_RUN)
 460                         goto invalid;
 461                 break;
 462         case IEEE80211_S_SLEEP:
 463                 sta_swbmiss_start(vap);
 464                 vap->iv_sta_ps(vap, 1);
 465                 break;
 466         default:
 467         invalid:
 468                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 469                     "%s: unexpected state transition %s -> %s\n", __func__,
 470                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 471                 break;
 472         }
 473         return 0;
 474 }
 475
 476 /*
 477  * Return non-zero if the frame is an echo of a multicast
 478  * frame sent by ourself.  The dir is known to be DSTODS.
 479  */
 480 static __inline int
 481 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 482 {
 483 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 484 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 485         const uint8_t *sa;
 486
 487         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 488
 489         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 490                 return 0;
 491         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 492         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 493 #undef WH4
 494 #undef QWH4
 495 }
 496
 497 /*
 498  * Return non-zero if the frame is an echo of a multicast
 499  * frame sent by ourself.  The dir is known to be FROMDS.
 500  */
 501 static __inline int
 502 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 503 {
 504         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 505
 506         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 507                 return 0;
 508         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 509 }
 510
 511 /*
 512  * Decide if a received management frame should be
 513  * printed when debugging is enabled.  This filters some
 514  * of the less interesting frames that come frequently
 515  * (e.g. beacons).
 516  */
 517 static __inline int
 518 doprint(struct ieee80211vap *vap, int subtype)
 519 {
 520         switch (subtype) {
 521         case IEEE80211_FC0_SUBTYPE_BEACON:
 522                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 523         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 524                 return 0;
 525         }
 526         return 1;
 527 }
 528
 529 /*
 530  * Process a received frame.  The node associated with the sender
 531  * should be supplied.  If nothing was found in the node table then
 532  * the caller is assumed to supply a reference to iv_bss instead.
 533  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 534  * during AP scanning to select a AP to associate with; it can have
 535  * any units so long as values have consistent units and higher values
 536  * mean ``better signal''.  The receive timestamp is currently not used
 537  * by the 802.11 layer.
 538  */
 539 static int
 540 sta_input(struct ieee80211_node *ni, struct mbuf *m,
 541     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 542 {
 543         struct ieee80211vap *vap = ni->ni_vap;
 544         struct ieee80211com *ic = ni->ni_ic;
 545         struct ifnet *ifp = vap->iv_ifp;
 546         struct ieee80211_frame *wh;
 547         struct ieee80211_key *key;
 548         struct ether_header *eh;
 549         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 550         uint8_t dir, type, subtype, qos;
 551         uint8_t *bssid;
 552         int is_hw_decrypted = 0;
 553         int has_decrypted = 0;
 554
 555         KASSERT(ni != NULL, ("%s: null node, mbuf %p", __func__, m));
 556
 557         /* Early init in case of early error case. */
 558         type = -1;
 559
 560         /*
 561          * Bit of a cheat here, we use a pointer for a 3-address
 562          * frame format but don't reference fields past outside
 563          * ieee80211_frame_min (or other shorter frames) w/o first
 564          * validating the data is present.
 565          */
 566         wh = mtod(m, struct ieee80211_frame *);
 567
 568         if (m->m_pkthdr.len < 2 || m->m_pkthdr.len < ieee80211_anyhdrsize(wh)) {
 569                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 570                     ni->ni_macaddr, NULL,
 571                     "too short (1): len %u", m->m_pkthdr.len);
 572                 vap->iv_stats.is_rx_tooshort++;
 573                 goto err;
 574         }
 575         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 576             IEEE80211_FC0_VERSION_0) {
 577                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 578                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 579                     wh->i_fc[0], wh->i_fc[1]);
 580                 vap->iv_stats.is_rx_badversion++;
 581                 goto err;
 582         }
 583
 584         /*
 585          * Some devices do hardware decryption all the way through
 586          * to pretending the frame wasn't encrypted in the first place.
 587          * So, tag it appropriately so it isn't discarded inappropriately.
 588          */
 589         if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
 590                 is_hw_decrypted = 1;
 591
 592         if (m->m_flags & M_AMPDU_MPDU) {
 593                 /*
 594                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 595                  * w/ M_AMPDU_MPDU marked have already passed through
 596                  * here but were received out of order and been held on
 597                  * the reorder queue.  When resubmitted they are marked
 598                  * with the M_AMPDU_MPDU flag and we can bypass most of
 599                  * the normal processing.
 600                  */
 601                 type = IEEE80211_FC0_TYPE_DATA;
 602                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 603                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 604                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 605                 goto resubmit_ampdu;
 606         }
 607
 608         ni->ni_inact = ni->ni_inact_reload;
 609
 610         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 611         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 612         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 613         /*
 614          * Control frames are not folowing the header scheme of data and mgmt
 615          * frames so we do not apply extra checks here.
 616          * We probably should do checks on RA (+TA) where available for those
 617          * too, but for now do not drop them.
 618          */
 619         if (type != IEEE80211_FC0_TYPE_CTL &&
 620             (ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 621                 bssid = wh->i_addr2;
 622                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 623                         /* not interested in */
 624                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 625                             bssid, NULL, "%s", "not to bss");
 626                         vap->iv_stats.is_rx_wrongbss++;
 627                         goto out;
 628                 }
 629
 630                 /*
 631                  * Some devices may be in a promiscuous mode
 632                  * where they receive frames for multiple station
 633                  * addresses.
 634                  *
 635                  * If we receive a data frame that isn't
 636                  * destined to our VAP MAC, drop it.
 637                  *
 638                  * XXX TODO: This is only enforced when not scanning;
 639                  * XXX it assumes a software-driven scan will put the NIC
 640                  * XXX into a "no data frames" mode before setting this
 641                  * XXX flag. Otherwise it may be possible that we'll still
 642                  * XXX process data frames whilst scanning.
 643                  */
 644                 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
 645                     && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
 646                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 647                             bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
 648                             IF_LLADDR(ifp), ":", wh->i_addr1, ":");
 649                         vap->iv_stats.is_rx_wrongbss++;
 650                         goto out;
 651                 }
 652
 653                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 654                 ni->ni_noise = nf;
 655                 if ( IEEE80211_HAS_SEQ(type, subtype) &&
 656                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 657                         uint8_t tid = ieee80211_gettid(wh);
 658                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 659                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 660                                 ic->ic_wme.wme_hipri_traffic++;
 661                         if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
 662                                 goto out;
 663                 }
 664         }
 665
 666         switch (type) {
 667         case IEEE80211_FC0_TYPE_DATA:
 668                 hdrspace = ieee80211_hdrspace(ic, wh);
 669                 if (m->m_len < hdrspace &&
 670                     (m = m_pullup(m, hdrspace)) == NULL) {
 671                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 672                             ni->ni_macaddr, NULL,
 673                             "data too short: expecting %u", hdrspace);
 674                         vap->iv_stats.is_rx_tooshort++;
 675                         goto out;               /* XXX */
 676                 }
 677                 /*
 678                  * Handle A-MPDU re-ordering.  If the frame is to be
 679                  * processed directly then ieee80211_ampdu_reorder
 680                  * will return 0; otherwise it has consumed the mbuf
 681                  * and we should do nothing more with it.
 682                  */
 683                 if ((m->m_flags & M_AMPDU) &&
 684                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 685                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 686                     ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
 687                         m = NULL;
 688                         goto out;
 689                 }
 690         resubmit_ampdu:
 691                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 692                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 693                             isfromds_mcastecho(vap, wh)) {
 694                                 /*
 695                                  * In IEEE802.11 network, multicast
 696                                  * packets sent from "me" are broadcast
 697                                  * from the AP; silently discard for
 698                                  * SIMPLEX interface.
 699                                  */
 700                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 701                                     wh, "data", "%s", "multicast echo");
 702                                 vap->iv_stats.is_rx_mcastecho++;
 703                                 goto out;
 704                         }
 705                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 706                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 707                                 /*
 708                                  * DWDS sta's must drop 3-address mcast frames
 709                                  * as they will be sent separately as a 4-addr
 710                                  * frame.  Accepting the 3-addr frame will
 711                                  * confuse the bridge into thinking the sending
 712                                  * sta is located at the end of WDS link.
 713                                  */
 714                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 715                                     "3-address data", "%s", "DWDS enabled");
 716                                 vap->iv_stats.is_rx_mcastecho++;
 717                                 goto out;
 718                         }
 719                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 720                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 721                                 IEEE80211_DISCARD(vap,
 722                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 723                                     "%s", "DWDS not enabled");
 724                                 vap->iv_stats.is_rx_wrongdir++;
 725                                 goto out;
 726                         }
 727                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 728                             isdstods_mcastecho(vap, wh)) {
 729                                 /*
 730                                  * In IEEE802.11 network, multicast
 731                                  * packets sent from "me" are broadcast
 732                                  * from the AP; silently discard for
 733                                  * SIMPLEX interface.
 734                                  */
 735                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 736                                     "4-address data", "%s", "multicast echo");
 737                                 vap->iv_stats.is_rx_mcastecho++;
 738                                 goto out;
 739                         }
 740                 } else {
 741                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 742                             "data", "incorrect dir 0x%x", dir);
 743                         vap->iv_stats.is_rx_wrongdir++;
 744                         goto out;
 745                 }
 746
 747                 /*
 748                  * Handle privacy requirements for hardware decryption
 749                  * devices.
 750                  *
 751                  * For those devices, a handful of things happen.
 752                  *
 753                  * + If IV has been stripped, then we can't run
 754                  *   ieee80211_crypto_decap() - none of the key
 755                  * + If MIC has been stripped, we can't validate
 756                  *   MIC here.
 757                  * + If MIC fails, then we need to communicate a
 758                  *   MIC failure up to the stack - but we don't know
 759                  *   which key was used.
 760                  */
 761
 762                 /*
 763                  * Handle privacy requirements.  Note that we
 764                  * must not be preempted from here until after
 765                  * we (potentially) call ieee80211_crypto_demic;
 766                  * otherwise we may violate assumptions in the
 767                  * crypto cipher modules used to do delayed update
 768                  * of replay sequence numbers.
 769                  */
 770                 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 771                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 772                                 /*
 773                                  * Discard encrypted frames when privacy is off.
 774                                  */
 775                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 776                                     wh, "WEP", "%s", "PRIVACY off");
 777                                 vap->iv_stats.is_rx_noprivacy++;
 778                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 779                                 goto out;
 780                         }
 781                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 782                                 /* NB: stats+msgs handled in crypto_decap */
 783                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 784                                 goto out;
 785                         }
 786                         wh = mtod(m, struct ieee80211_frame *);
 787                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 788                         has_decrypted = 1;
 789                 } else {
 790                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 791                         key = NULL;
 792                 }
 793
 794                 /*
 795                  * Save QoS bits for use below--before we strip the header.
 796                  */
 797                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS)
 798                         qos = ieee80211_getqos(wh)[0];
 799                 else
 800                         qos = 0;
 801
 802                 /*
 803                  * Next up, any fragmentation.
 804                  */
 805                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 806                         m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
 807                         if (m == NULL) {
 808                                 /* Fragment dropped or frame not complete yet */
 809                                 goto out;
 810                         }
 811                 }
 812                 wh = NULL;              /* no longer valid, catch any uses */
 813
 814                 /*
 815                  * Next strip any MSDU crypto bits.
 816                  *
 817                  * Note: we can't do MIC stripping/verification if the
 818                  * upper layer has stripped it.  We have to check MIC
 819                  * ourselves.  So, key may be NULL, but we have to check
 820                  * the RX status.
 821                  */
 822                 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
 823                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 824                             ni->ni_macaddr, "data", "%s", "demic error");
 825                         vap->iv_stats.is_rx_demicfail++;
 826                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 827                         goto out;
 828                 }
 829
 830                 /* copy to listener after decrypt */
 831                 if (ieee80211_radiotap_active_vap(vap))
 832                         ieee80211_radiotap_rx(vap, m);
 833                 need_tap = 0;
 834
 835                 /*
 836                  * Finally, strip the 802.11 header.
 837                  */
 838                 m = ieee80211_decap(vap, m, hdrspace, qos);
 839                 if (m == NULL) {
 840                         /* XXX mask bit to check for both */
 841                         /* don't count Null data frames as errors */
 842                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 843                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 844                                 goto out;
 845                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 846                             ni->ni_macaddr, "data", "%s", "decap error");
 847                         vap->iv_stats.is_rx_decap++;
 848                         IEEE80211_NODE_STAT(ni, rx_decap);
 849                         goto err;
 850                 }
 851                 if (!(qos & IEEE80211_QOS_AMSDU))
 852                         eh = mtod(m, struct ether_header *);
 853                 else
 854                         eh = NULL;
 855                 if (!ieee80211_node_is_authorized(ni)) {
 856                         /*
 857                          * Deny any non-PAE frames received prior to
 858                          * authorization.  For open/shared-key
 859                          * authentication the port is mark authorized
 860                          * after authentication completes.  For 802.1x
 861                          * the port is not marked authorized by the
 862                          * authenticator until the handshake has completed.
 863                          */
 864                         if (eh == NULL ||
 865                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 866                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 867                                     ni->ni_macaddr, "data", "unauthorized or "
 868                                     "unknown port: ether type 0x%x len %u",
 869                                     eh == NULL ? -1 : eh->ether_type,
 870                                     m->m_pkthdr.len);
 871                                 vap->iv_stats.is_rx_unauth++;
 872                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 873                                 goto err;
 874                         }
 875                 } else {
 876                         /*
 877                          * When denying unencrypted frames, discard
 878                          * any non-PAE frames received without encryption.
 879                          */
 880                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 881                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 882                             (is_hw_decrypted == 0) &&
 883                             (eh == NULL ||
 884                              eh->ether_type != htons(ETHERTYPE_PAE))) {
 885                                 /*
 886                                  * Drop unencrypted frames.
 887                                  */
 888                                 vap->iv_stats.is_rx_unencrypted++;
 889                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 890                                 goto out;
 891                         }
 892                 }
 893                 /* XXX require HT? */
 894                 if (qos & IEEE80211_QOS_AMSDU) {
 895                         m = ieee80211_decap_amsdu(ni, m);
 896                         if (m == NULL)
 897                                 return IEEE80211_FC0_TYPE_DATA;
 898                 } else {
 899 #ifdef IEEE80211_SUPPORT_SUPERG
 900                         m = ieee80211_decap_fastframe(vap, ni, m);
 901                         if (m == NULL)
 902                                 return IEEE80211_FC0_TYPE_DATA;
 903 #endif
 904                 }
 905                 ieee80211_deliver_data(vap, ni, m);
 906                 return IEEE80211_FC0_TYPE_DATA;
 907
 908         case IEEE80211_FC0_TYPE_MGT:
 909                 vap->iv_stats.is_rx_mgmt++;
 910                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 911                 if (dir != IEEE80211_FC1_DIR_NODS) {
 912                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 913                             wh, "data", "incorrect dir 0x%x", dir);
 914                         vap->iv_stats.is_rx_wrongdir++;
 915                         goto err;
 916                 }
 917                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 918                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 919                             ni->ni_macaddr, "mgt", "too short: len %u",
 920                             m->m_pkthdr.len);
 921                         vap->iv_stats.is_rx_tooshort++;
 922                         goto out;
 923                 }
 924 #ifdef IEEE80211_DEBUG
 925                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 926                     ieee80211_msg_dumppkts(vap)) {
 927                         if_printf(ifp, "received %s from %s rssi %d\n",
 928                             ieee80211_mgt_subtype_name(subtype),
 929                             ether_sprintf(wh->i_addr2), rssi);
 930                 }
 931 #endif
 932
 933                 /*
 934                  * Note: See above for hardware offload privacy requirements.
 935                  *       It also applies here.
 936                  */
 937
 938                 /*
 939                  * Again, having encrypted flag set check would be good, but
 940                  * then we have to also handle crypto_decap() like above.
 941                  */
 942                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 943                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 944                                 /*
 945                                  * Only shared key auth frames with a challenge
 946                                  * should be encrypted, discard all others.
 947                                  */
 948                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 949                                     wh, ieee80211_mgt_subtype_name(subtype),
 950                                     "%s", "WEP set but not permitted");
 951                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 952                                 goto out;
 953                         }
 954                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 955                                 /*
 956                                  * Discard encrypted frames when privacy is off.
 957                                  */
 958                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 959                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 960                                 vap->iv_stats.is_rx_noprivacy++;
 961                                 goto out;
 962                         }
 963                         hdrspace = ieee80211_hdrspace(ic, wh);
 964
 965                         /*
 966                          * Again, if IV/MIC was stripped, then this whole
 967                          * setup will fail.  That's going to need some poking.
 968                          */
 969                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 970                                 /* NB: stats+msgs handled in crypto_decap */
 971                                 goto out;
 972                         }
 973                         has_decrypted = 1;
 974                         wh = mtod(m, struct ieee80211_frame *);
 975                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 976                 }
 977                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 978                 goto out;
 979
 980         case IEEE80211_FC0_TYPE_CTL:
 981                 vap->iv_stats.is_rx_ctl++;
 982                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 983                 vap->iv_recv_ctl(ni, m, subtype);
 984                 goto out;
 985
 986         default:
 987                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 988                     wh, NULL, "bad frame type 0x%x", type);
 989                 /* should not come here */
 990                 break;
 991         }
 992 err:
 993         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 994 out:
 995         if (m != NULL) {
 996                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 997                         ieee80211_radiotap_rx(vap, m);
 998                 m_freem(m);
 999         }
1000         return type;
1001 }
1002
1003 static void
1004 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1005     int rssi, int nf, uint16_t seq, uint16_t status)
1006 {
1007         struct ieee80211vap *vap = ni->ni_vap;
1008
1009         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
1010                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1011                     ni->ni_macaddr, "open auth",
1012                     "bad sta auth mode %u", ni->ni_authmode);
1013                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
1014                 return;
1015         }
1016         if (vap->iv_state != IEEE80211_S_AUTH ||
1017             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
1018                 vap->iv_stats.is_rx_bad_auth++;
1019                 return;
1020         }
1021         if (status != 0) {
1022                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1023                     ni, "open auth failed (reason %d)", status);
1024                 vap->iv_stats.is_rx_auth_fail++;
1025                 vap->iv_stats.is_rx_authfail_code = status;
1026                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1027                     IEEE80211_SCAN_FAIL_STATUS);
1028         } else
1029                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1030 }
1031
1032 static void
1033 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1034     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1035     uint16_t seq, uint16_t status)
1036 {
1037         struct ieee80211vap *vap = ni->ni_vap;
1038         uint8_t *challenge;
1039
1040         /*
1041          * NB: this can happen as we allow pre-shared key
1042          * authentication to be enabled w/o wep being turned
1043          * on so that configuration of these can be done
1044          * in any order.  It may be better to enforce the
1045          * ordering in which case this check would just be
1046          * for sanity/consistency.
1047          */
1048         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1049                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1050                     ni->ni_macaddr, "shared key auth",
1051                     "%s", " PRIVACY is disabled");
1052                 goto bad;
1053         }
1054         /*
1055          * Pre-shared key authentication is evil; accept
1056          * it only if explicitly configured (it is supported
1057          * mainly for compatibility with clients like OS X).
1058          */
1059         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1060             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1061                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1062                     ni->ni_macaddr, "shared key auth",
1063                     "bad sta auth mode %u", ni->ni_authmode);
1064                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1065                 goto bad;
1066         }
1067
1068         challenge = NULL;
1069         if (frm + 1 < efrm) {
1070                 if ((frm[1] + 2) > (efrm - frm)) {
1071                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1072                             ni->ni_macaddr, "shared key auth",
1073                             "ie %d/%d too long",
1074                             frm[0], (frm[1] + 2) - (efrm - frm));
1075                         vap->iv_stats.is_rx_bad_auth++;
1076                         goto bad;
1077                 }
1078                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1079                         challenge = frm;
1080                 frm += frm[1] + 2;
1081         }
1082         switch (seq) {
1083         case IEEE80211_AUTH_SHARED_CHALLENGE:
1084         case IEEE80211_AUTH_SHARED_RESPONSE:
1085                 if (challenge == NULL) {
1086                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1087                             ni->ni_macaddr, "shared key auth",
1088                             "%s", "no challenge");
1089                         vap->iv_stats.is_rx_bad_auth++;
1090                         goto bad;
1091                 }
1092                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1093                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1094                             ni->ni_macaddr, "shared key auth",
1095                             "bad challenge len %d", challenge[1]);
1096                         vap->iv_stats.is_rx_bad_auth++;
1097                         goto bad;
1098                 }
1099         default:
1100                 break;
1101         }
1102         if (vap->iv_state != IEEE80211_S_AUTH)
1103                 return;
1104         switch (seq) {
1105         case IEEE80211_AUTH_SHARED_PASS:
1106                 if (ni->ni_challenge != NULL) {
1107                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
1108                         ni->ni_challenge = NULL;
1109                 }
1110                 if (status != 0) {
1111                         IEEE80211_NOTE_FRAME(vap,
1112                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1113                             "shared key auth failed (reason %d)", status);
1114                         vap->iv_stats.is_rx_auth_fail++;
1115                         vap->iv_stats.is_rx_authfail_code = status;
1116                         return;
1117                 }
1118                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1119                 break;
1120         case IEEE80211_AUTH_SHARED_CHALLENGE:
1121                 if (!ieee80211_alloc_challenge(ni))
1122                         return;
1123                 /* XXX could optimize by passing recvd challenge */
1124                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1125                 IEEE80211_SEND_MGMT(ni,
1126                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1127                 break;
1128         default:
1129                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1130                     wh, "shared key auth", "bad seq %d", seq);
1131                 vap->iv_stats.is_rx_bad_auth++;
1132                 return;
1133         }
1134         return;
1135 bad:
1136         /*
1137          * Kick the state machine.  This short-circuits
1138          * using the mgt frame timeout to trigger the
1139          * state transition.
1140          */
1141         if (vap->iv_state == IEEE80211_S_AUTH)
1142                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1143                     IEEE80211_SCAN_FAIL_STATUS);
1144 }
1145
1146 /*
1147  * Parse the WME IE for QoS and U-APSD information.
1148  *
1149  * Returns -1 if the IE isn't found, 1 if it's found.
1150  */
1151 int
1152 ieee80211_parse_wmeie(uint8_t *frm, const struct ieee80211_frame *wh,
1153     struct ieee80211_node *ni)
1154 {
1155         u_int len = frm[1];
1156
1157         ni->ni_uapsd = 0;
1158
1159         if (len < sizeof(struct ieee80211_wme_param)-2) {
1160                 IEEE80211_DISCARD_IE(ni->ni_vap,
1161                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1162                     wh, "WME", "too short, len %u", len);
1163                 return -1;
1164         }
1165
1166         ni->ni_uapsd = frm[WME_CAPINFO_IE_OFFSET];
1167
1168         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_POWER | IEEE80211_MSG_ASSOC,
1169             ni, "U-APSD settings from STA: 0x%02x", ni->ni_uapsd);
1170
1171         return 1;
1172 }
1173
1174 int
1175 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1176         const struct ieee80211_frame *wh, uint8_t *qosinfo)
1177 {
1178         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1179         u_int len = frm[1], qosinfo_count;
1180         int i;
1181
1182         *qosinfo = 0;
1183
1184         if (len < sizeof(struct ieee80211_wme_param)-2) {
1185                 IEEE80211_DISCARD_IE(vap,
1186                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1187                     wh, "WME", "too short, len %u", len);
1188                 return -1;
1189         }
1190         *qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1191         qosinfo_count = *qosinfo & WME_QOSINFO_COUNT;
1192
1193         /* XXX do proper check for wraparound */
1194         if (qosinfo_count == wme->wme_wmeChanParams.cap_info)
1195                 return 0;
1196         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1197         for (i = 0; i < WME_NUM_AC; i++) {
1198                 struct wmeParams *wmep =
1199                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1200                 /* NB: ACI not used */
1201                 wmep->wmep_acm = _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_ACM);
1202                 wmep->wmep_aifsn =
1203                     _IEEE80211_MASKSHIFT(frm[0], WME_PARAM_AIFSN);
1204                 wmep->wmep_logcwmin =
1205                      _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMIN);
1206                 wmep->wmep_logcwmax =
1207                      _IEEE80211_MASKSHIFT(frm[1], WME_PARAM_LOGCWMAX);
1208                 wmep->wmep_txopLimit = le16dec(frm+2);
1209                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
1210                     "%s: WME: %d: acm=%d aifsn=%d logcwmin=%d logcwmax=%d txopLimit=%d\n",
1211                     __func__,
1212                     i,
1213                     wmep->wmep_acm,
1214                     wmep->wmep_aifsn,
1215                     wmep->wmep_logcwmin,
1216                     wmep->wmep_logcwmax,
1217                     wmep->wmep_txopLimit);
1218                 frm += 4;
1219         }
1220         wme->wme_wmeChanParams.cap_info = qosinfo_count;
1221         return 1;
1222 }
1223
1224 /*
1225  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1226  * is the first CSA then initiate the switch.  Otherwise we
1227  * track state and trigger completion and/or cancel of the switch.
1228  * XXX should be public for IBSS use
1229  */
1230 static void
1231 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1232         const struct ieee80211_frame *wh)
1233 {
1234         struct ieee80211com *ic = vap->iv_ic;
1235         const struct ieee80211_csa_ie *csa =
1236             (const struct ieee80211_csa_ie *) frm;
1237
1238         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1239             ("state %s", ieee80211_state_name[vap->iv_state]));
1240
1241         if (csa->csa_mode > 1) {
1242                 IEEE80211_DISCARD_IE(vap,
1243                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1244                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1245                 return;
1246         }
1247         IEEE80211_LOCK(ic);
1248         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1249                 /*
1250                  * Convert the channel number to a channel reference.  We
1251                  * try first to preserve turbo attribute of the current
1252                  * channel then fallback.  Note this will not work if the
1253                  * CSA specifies a channel that requires a band switch (e.g.
1254                  * 11a => 11g).  This is intentional as 11h is defined only
1255                  * for 5GHz/11a and because the switch does not involve a
1256                  * reassociation, protocol state (capabilities, negotated
1257                  * rates, etc) may/will be wrong.
1258                  */
1259                 struct ieee80211_channel *c =
1260                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1261                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1262                 if (c == NULL) {
1263                         c = ieee80211_find_channel_byieee(ic,
1264                             csa->csa_newchan,
1265                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1266                         if (c == NULL) {
1267                                 IEEE80211_DISCARD_IE(vap,
1268                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1269                                     wh, "CSA", "invalid channel %u",
1270                                     csa->csa_newchan);
1271                                 goto done;
1272                         }
1273                 }
1274 #if IEEE80211_CSA_COUNT_MIN > 0
1275                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1276                         /*
1277                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1278                          * reduce the risk of being redirected by a fabricated
1279                          * CSA.  If a valid CSA is dropped we'll still get a
1280                          * beacon miss when the AP leaves the channel so we'll
1281                          * eventually follow to the new channel.
1282                          *
1283                          * NOTE: this violates the 11h spec that states that
1284                          * count may be any value and if 0 then a switch
1285                          * should happen asap.
1286                          */
1287                         IEEE80211_DISCARD_IE(vap,
1288                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1289                             wh, "CSA", "count %u too small, must be >= %u",
1290                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1291                         goto done;
1292                 }
1293 #endif
1294                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1295         } else {
1296                 /*
1297                  * Validate this ie against the initial CSA.  We require
1298                  * mode and channel not change and the count must be
1299                  * monotonically decreasing.  This may be pointless and
1300                  * canceling the switch as a result may be too paranoid but
1301                  * in the worst case if we drop out of CSA because of this
1302                  * and the AP does move then we'll just end up taking a
1303                  * beacon miss and scan to find the AP.
1304                  *
1305                  * XXX may want <= on count as we also process ProbeResp
1306                  * frames and those may come in w/ the same count as the
1307                  * previous beacon; but doing so leaves us open to a stuck
1308                  * count until we add a dead-man timer
1309                  */
1310                 if (!(csa->csa_count < ic->ic_csa_count &&
1311                       csa->csa_mode == ic->ic_csa_mode &&
1312                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1313                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1314                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1315                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1316                             ic->ic_csa_newchan, ic->ic_csa_count,
1317                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1318                         ieee80211_csa_cancelswitch(ic);
1319                 } else {
1320                         if (csa->csa_count <= 1)
1321                                 ieee80211_csa_completeswitch(ic);
1322                         else
1323                                 ic->ic_csa_count = csa->csa_count;
1324                 }
1325         }
1326 done:
1327         IEEE80211_UNLOCK(ic);
1328 }
1329
1330 /*
1331  * Return non-zero if a background scan may be continued:
1332  * o bg scan is active
1333  * o no channel switch is pending
1334  * o there has not been any traffic recently
1335  * o no full-offload scan support (no need for explicitly continuing scan then)
1336  *
1337  * Note we do not check if there is an administrative enable;
1338  * this is only done to start the scan.  We assume that any
1339  * change in state will be accompanied by a request to cancel
1340  * active scans which will otherwise cause this test to fail.
1341  */
1342 static __inline int
1343 contbgscan(struct ieee80211vap *vap)
1344 {
1345         struct ieee80211com *ic = vap->iv_ic;
1346
1347         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1348             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1349             !(vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) &&
1350             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1351             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1352 }
1353
1354 /*
1355  * Return non-zero if a backgrond scan may be started:
1356  * o bg scanning is administratively enabled
1357  * o no channel switch is pending
1358  * o we are not boosted on a dynamic turbo channel
1359  * o there has not been a scan recently
1360  * o there has not been any traffic recently (don't check if full-offload scan)
1361  */
1362 static __inline int
1363 startbgscan(struct ieee80211vap *vap)
1364 {
1365         struct ieee80211com *ic = vap->iv_ic;
1366
1367         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1368             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1369 #ifdef IEEE80211_SUPPORT_SUPERG
1370             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1371 #endif
1372             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1373             ((vap->iv_flags_ext & IEEE80211_FEXT_SCAN_OFFLOAD) ||
1374              ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle)));
1375 }
1376
1377 #ifdef  notyet
1378 /*
1379  * Compare two quiet IEs and return if they are equivalent.
1380  *
1381  * The tbttcount isnt checked - that's not part of the configuration.
1382  */
1383 static int
1384 compare_quiet_ie(const struct ieee80211_quiet_ie *q1,
1385     const struct ieee80211_quiet_ie *q2)
1386 {
1387
1388         if (q1->period != q2->period)
1389                 return (0);
1390         if (le16dec(&q1->duration) != le16dec(&q2->duration))
1391                 return (0);
1392         if (le16dec(&q1->offset) != le16dec(&q2->offset))
1393                 return (0);
1394         return (1);
1395 }
1396 #endif
1397
1398 static void
1399 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
1400     const struct ieee80211_rx_stats *rxs,
1401     int rssi, int nf)
1402 {
1403 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1404         struct ieee80211vap *vap = ni->ni_vap;
1405         struct ieee80211com *ic = ni->ni_ic;
1406         struct ieee80211_channel *rxchan = ic->ic_curchan;
1407         struct ieee80211_frame *wh;
1408         int ht_state_change = 0, do_ht = 0;
1409         uint8_t *frm, *efrm;
1410         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1411         uint8_t *vhtcap, *vhtopmode;
1412         uint8_t rate;
1413         uint8_t qosinfo;
1414
1415         wh = mtod(m0, struct ieee80211_frame *);
1416         frm = (uint8_t *)&wh[1];
1417         efrm = mtod(m0, uint8_t *) + m0->m_len;
1418         switch (subtype) {
1419         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1420         case IEEE80211_FC0_SUBTYPE_BEACON: {
1421                 struct ieee80211_scanparams scan;
1422                 struct ieee80211_channel *c;
1423                 /*
1424                  * We process beacon/probe response frames:
1425                  *    o when scanning, or
1426                  *    o station mode when associated (to collect state
1427                  *      updates such as 802.11g slot time)
1428                  * Frames otherwise received are discarded.
1429                  */
1430                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1431                         vap->iv_stats.is_rx_mgtdiscard++;
1432                         return;
1433                 }
1434
1435                 /* Override RX channel as appropriate */
1436                 if (rxs != NULL) {
1437                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
1438                         if (c != NULL)
1439                                 rxchan = c;
1440                 }
1441
1442                 /* XXX probe response in sta mode when !scanning? */
1443                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
1444                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
1445                                 vap->iv_stats.is_beacon_bad++;
1446                         return;
1447                 }
1448
1449                 /*
1450                  * Count frame now that we know it's to be processed.
1451                  */
1452                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1453                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1454                         IEEE80211_NODE_STAT(ni, rx_beacons);
1455                 } else
1456                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1457                 /*
1458                  * When operating in station mode, check for state updates.
1459                  * Be careful to ignore beacons received while doing a
1460                  * background scan.  We consider only 11g/WMM stuff right now.
1461                  */
1462                 if (ni->ni_associd != 0 &&
1463                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1464                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1465                         /* record tsf of last beacon */
1466                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1467                                 sizeof(ni->ni_tstamp));
1468                         /* count beacon frame for s/w bmiss handling */
1469                         vap->iv_swbmiss_count++;
1470                         vap->iv_bmiss_count = 0;
1471                         if (ni->ni_erp != scan.erp) {
1472                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1473                                     wh->i_addr2,
1474                                     "erp change: was 0x%x, now 0x%x",
1475                                     ni->ni_erp, scan.erp);
1476                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1477                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1478                                         vap->iv_flags |= IEEE80211_F_USEPROT;
1479                                 else
1480                                         vap->iv_flags &= ~IEEE80211_F_USEPROT;
1481                                 ni->ni_erp = scan.erp;
1482                                 /* XXX statistic */
1483                                 /* driver notification */
1484                                 ieee80211_vap_update_erp_protmode(vap);
1485                         }
1486                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1487                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1488                                     wh->i_addr2,
1489                                     "capabilities change: was 0x%x, now 0x%x",
1490                                     ni->ni_capinfo, scan.capinfo);
1491                                 /*
1492                                  * NB: we assume short preamble doesn't
1493                                  *     change dynamically
1494                                  */
1495                                 ieee80211_vap_set_shortslottime(vap,
1496                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1497                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1498                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1499                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1500                                 /* XXX statistic */
1501                         }
1502                         if (scan.wme != NULL &&
1503                             (ni->ni_flags & IEEE80211_NODE_QOS)) {
1504                                 int _retval;
1505                                 if ((_retval = ieee80211_parse_wmeparams(vap,
1506                                     scan.wme, wh, &qosinfo)) >= 0) {
1507                                         if (qosinfo & WME_CAPINFO_UAPSD_EN)
1508                                                 ni->ni_flags |=
1509                                                     IEEE80211_NODE_UAPSD;
1510                                         if (_retval > 0)
1511                                                 ieee80211_wme_updateparams(vap);
1512                                 }
1513                         } else
1514                                 ni->ni_flags &= ~IEEE80211_NODE_UAPSD;
1515 #ifdef IEEE80211_SUPPORT_SUPERG
1516                         if (scan.ath != NULL)
1517                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1518 #endif
1519                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1520                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1521                                 /* XXX state changes? */
1522                                 ieee80211_ht_updateparams(ni,
1523                                     scan.htcap, scan.htinfo);
1524                                 do_ht = 1;
1525                         }
1526                         if (scan.vhtcap != NULL && scan.vhtopmode != NULL &&
1527                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1528                                 /* XXX state changes? */
1529                                 ieee80211_vht_updateparams(ni,
1530                                     scan.vhtcap, scan.vhtopmode);
1531                                 do_ht = 1;
1532                         }
1533                         if (do_ht) {
1534                                 if (ieee80211_ht_updateparams_final(ni,
1535                                     scan.htcap, scan.htinfo))
1536                                         ht_state_change = 1;
1537                         }
1538
1539                         /*
1540                          * If we have a quiet time IE then report it up to
1541                          * the driver.
1542                          *
1543                          * Otherwise, inform the driver that the quiet time
1544                          * IE has disappeared - only do that once rather than
1545                          * spamming it each time.
1546                          */
1547                         if (scan.quiet) {
1548                                 ic->ic_set_quiet(ni, scan.quiet);
1549                                 ni->ni_quiet_ie_set = 1;
1550                                 memcpy(&ni->ni_quiet_ie, scan.quiet,
1551                                     sizeof(struct ieee80211_quiet_ie));
1552                         } else {
1553                                 if (ni->ni_quiet_ie_set == 1)
1554                                         ic->ic_set_quiet(ni, NULL);
1555                                 ni->ni_quiet_ie_set = 0;
1556                                 bzero(&ni->ni_quiet_ie,
1557                                     sizeof(struct ieee80211_quiet_ie));
1558                         }
1559
1560                         if (scan.tim != NULL) {
1561                                 struct ieee80211_tim_ie *tim =
1562                                     (struct ieee80211_tim_ie *) scan.tim;
1563                                 /*
1564                                  * XXX Check/debug this code; see if it's about
1565                                  * the right time to force the VAP awake if we
1566                                  * receive a frame destined for us?
1567                                  */
1568                                 int aid = IEEE80211_AID(ni->ni_associd);
1569                                 int ix = aid / NBBY;
1570                                 int min = tim->tim_bitctl &~ 1;
1571                                 int max = tim->tim_len + min - 4;
1572                                 int tim_ucast = 0, tim_mcast = 0;
1573
1574                                 /*
1575                                  * Only do this for unicast traffic in the TIM
1576                                  * The multicast traffic notification for
1577                                  * the scan notification stuff should occur
1578                                  * differently.
1579                                  */
1580                                 if (min <= ix && ix <= max &&
1581                                      isset(tim->tim_bitmap - min, aid)) {
1582                                         tim_ucast = 1;
1583                                 }
1584
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
1593                                 /*
1594                                  * If the TIM indicates there's traffic for
1595                                  * us then get us out of STA mode powersave.
1596                                  */
1597                                 if (tim_ucast == 1) {
1598                                         /*
1599                                          * Wake us out of SLEEP state if we're
1600                                          * in it; and if we're doing bgscan
1601                                          * then wake us out of STA powersave.
1602                                          */
1603                                         ieee80211_sta_tim_notify(vap, 1);
1604
1605                                         /*
1606                                          * This is preventing us from
1607                                          * continuing a bgscan; because it
1608                                          * tricks the contbgscan()
1609                                          * routine to think there's always
1610                                          * traffic for us.
1611                                          *
1612                                          * I think we need both an RX and
1613                                          * TX ic_lastdata field.
1614                                          */
1615                                         ic->ic_lastdata = ticks;
1616                                 }
1617
1618                                 ni->ni_dtim_count = tim->tim_count;
1619                                 ni->ni_dtim_period = tim->tim_period;
1620                         }
1621                         if (scan.csa != NULL &&
1622                             (vap->iv_flags & IEEE80211_F_DOTH))
1623                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1624                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1625                                 /*
1626                                  * No CSA ie or 11h disabled, but a channel
1627                                  * switch is pending; drop out so we aren't
1628                                  * stuck in CSA state.  If the AP really is
1629                                  * moving we'll get a beacon miss and scan.
1630                                  */
1631                                 IEEE80211_LOCK(ic);
1632                                 ieee80211_csa_cancelswitch(ic);
1633                                 IEEE80211_UNLOCK(ic);
1634                         }
1635                         /*
1636                          * If scanning, pass the info to the scan module.
1637                          * Otherwise, check if it's the right time to do
1638                          * a background scan.  Background scanning must
1639                          * be enabled and we must not be operating in the
1640                          * turbo phase of dynamic turbo mode.  Then,
1641                          * it's been a while since the last background
1642                          * scan and if no data frames have come through
1643                          * recently, kick off a scan.  Note that this
1644                          * is the mechanism by which a background scan
1645                          * is started _and_ continued each time we
1646                          * return on-channel to receive a beacon from
1647                          * our ap.
1648                          */
1649                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1650                                 ieee80211_add_scan(vap, rxchan,
1651                                     &scan, wh, subtype, rssi, nf);
1652                         } else if (contbgscan(vap)) {
1653                                 ieee80211_bg_scan(vap, 0);
1654                         } else if (startbgscan(vap)) {
1655                                 vap->iv_stats.is_scan_bg++;
1656 #if 0
1657                                 /* wakeup if we are sleeing */
1658                                 ieee80211_set_pwrsave(vap, 0);
1659 #endif
1660                                 ieee80211_bg_scan(vap, 0);
1661                         }
1662
1663                         /*
1664                          * Put the station to sleep if we haven't seen
1665                          * traffic in a while.
1666                          */
1667                         IEEE80211_LOCK(ic);
1668                         ieee80211_sta_ps_timer_check(vap);
1669                         IEEE80211_UNLOCK(ic);
1670
1671                         /*
1672                          * If we've had a channel width change (eg HT20<->HT40)
1673                          * then schedule a delayed driver notification.
1674                          */
1675                         if (ht_state_change)
1676                                 ieee80211_update_chw(ic);
1677                         return;
1678                 }
1679                 /*
1680                  * If scanning, just pass information to the scan module.
1681                  */
1682                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1683                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1684                                 /*
1685                                  * Actively scanning a channel marked passive;
1686                                  * send a probe request now that we know there
1687                                  * is 802.11 traffic present.
1688                                  *
1689                                  * XXX check if the beacon we recv'd gives
1690                                  * us what we need and suppress the probe req
1691                                  */
1692                                 ieee80211_probe_curchan(vap, 1);
1693                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1694                         }
1695                         ieee80211_add_scan(vap, rxchan, &scan, wh,
1696                             subtype, rssi, nf);
1697                         return;
1698                 }
1699                 break;
1700         }
1701
1702         case IEEE80211_FC0_SUBTYPE_AUTH: {
1703                 uint16_t algo, seq, status;
1704                 /*
1705                  * auth frame format
1706                  *      [2] algorithm
1707                  *      [2] sequence
1708                  *      [2] status
1709                  *      [tlv*] challenge
1710                  */
1711                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1712                 algo   = le16toh(*(uint16_t *)frm);
1713                 seq    = le16toh(*(uint16_t *)(frm + 2));
1714                 status = le16toh(*(uint16_t *)(frm + 4));
1715                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1716                     "recv auth frame with algorithm %d seq %d", algo, seq);
1717
1718                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1719                         IEEE80211_DISCARD(vap,
1720                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1721                             wh, "auth", "%s", "TKIP countermeasures enabled");
1722                         vap->iv_stats.is_rx_auth_countermeasures++;
1723                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1724                                 ieee80211_send_error(ni, wh->i_addr2,
1725                                         IEEE80211_FC0_SUBTYPE_AUTH,
1726                                         IEEE80211_REASON_MIC_FAILURE);
1727                         }
1728                         return;
1729                 }
1730                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1731                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1732                             seq, status);
1733                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1734                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1735                 else {
1736                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1737                             wh, "auth", "unsupported alg %d", algo);
1738                         vap->iv_stats.is_rx_auth_unsupported++;
1739                         return;
1740                 }
1741                 break;
1742         }
1743
1744         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1745         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1746                 uint16_t capinfo, associd;
1747                 uint16_t status;
1748
1749                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1750                         vap->iv_stats.is_rx_mgtdiscard++;
1751                         return;
1752                 }
1753
1754                 /*
1755                  * asresp frame format
1756                  *      [2] capability information
1757                  *      [2] status
1758                  *      [2] association ID
1759                  *      [tlv] supported rates
1760                  *      [tlv] extended supported rates
1761                  *      [tlv] WME
1762                  *      [tlv] HT capabilities
1763                  *      [tlv] HT info
1764                  */
1765                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1766                 ni = vap->iv_bss;
1767                 capinfo = le16toh(*(uint16_t *)frm);
1768                 frm += 2;
1769                 status = le16toh(*(uint16_t *)frm);
1770                 frm += 2;
1771                 if (status != 0) {
1772                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1773                             wh->i_addr2, "%sassoc failed (reason %d)",
1774                             ISREASSOC(subtype) ?  "re" : "", status);
1775                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1776                         return;
1777                 }
1778                 associd = le16toh(*(uint16_t *)frm);
1779                 frm += 2;
1780
1781                 rates = xrates = wme = htcap = htinfo = NULL;
1782                 vhtcap = vhtopmode = NULL;
1783                 while (efrm - frm > 1) {
1784                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1785                         switch (*frm) {
1786                         case IEEE80211_ELEMID_RATES:
1787                                 rates = frm;
1788                                 break;
1789                         case IEEE80211_ELEMID_XRATES:
1790                                 xrates = frm;
1791                                 break;
1792                         case IEEE80211_ELEMID_HTCAP:
1793                                 htcap = frm;
1794                                 break;
1795                         case IEEE80211_ELEMID_HTINFO:
1796                                 htinfo = frm;
1797                                 break;
1798                         case IEEE80211_ELEMID_VENDOR:
1799                                 if (iswmeoui(frm))
1800                                         wme = frm;
1801                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1802                                         /*
1803                                          * Accept pre-draft HT ie's if the
1804                                          * standard ones have not been seen.
1805                                          */
1806                                         if (ishtcapoui(frm)) {
1807                                                 if (htcap == NULL)
1808                                                         htcap = frm;
1809                                         } else if (ishtinfooui(frm)) {
1810                                                 if (htinfo == NULL)
1811                                                         htinfo = frm;
1812                                         }
1813                                 }
1814                                 /* XXX Atheros OUI support */
1815                                 break;
1816                         case IEEE80211_ELEMID_VHT_CAP:
1817                                 vhtcap = frm;
1818                                 break;
1819                         case IEEE80211_ELEMID_VHT_OPMODE:
1820                                 vhtopmode = frm;
1821                                 break;
1822                         }
1823                         frm += frm[1] + 2;
1824                 }
1825
1826                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1827                 if (xrates != NULL)
1828                         IEEE80211_VERIFY_ELEMENT(xrates,
1829                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1830                 rate = ieee80211_setup_rates(ni, rates, xrates,
1831                                 IEEE80211_F_JOIN |
1832                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1833                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1834                 if (rate & IEEE80211_RATE_BASIC) {
1835                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1836                             wh->i_addr2,
1837                             "%sassoc failed (rate set mismatch)",
1838                             ISREASSOC(subtype) ?  "re" : "");
1839                         vap->iv_stats.is_rx_assoc_norate++;
1840                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1841                             IEEE80211_SCAN_FAIL_STATUS);
1842                         return;
1843                 }
1844
1845                 ni->ni_capinfo = capinfo;
1846                 ni->ni_associd = associd;
1847                 if (ni->ni_jointime == 0)
1848                         ni->ni_jointime = time_uptime;
1849                 if (wme != NULL &&
1850                     ieee80211_parse_wmeparams(vap, wme, wh, &qosinfo) >= 0) {
1851                         ni->ni_flags |= IEEE80211_NODE_QOS;
1852                         ieee80211_wme_updateparams(vap);
1853                 } else
1854                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1855                 /*
1856                  * Setup HT state according to the negotiation.
1857                  *
1858                  * NB: shouldn't need to check if HT use is enabled but some
1859                  *     ap's send back HT ie's even when we don't indicate we
1860                  *     are HT capable in our AssocReq.
1861                  */
1862                 if (htcap != NULL && htinfo != NULL &&
1863                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1864                         ieee80211_ht_node_init(ni);
1865                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1866
1867                         if ((vhtcap != NULL) && (vhtopmode != NULL) &
1868                             (vap->iv_flags_vht & IEEE80211_FVHT_VHT)) {
1869                                 /*
1870                                  * Log if we get a VHT assoc/reassoc response.
1871                                  * We aren't ready for 2GHz VHT support.
1872                                  */
1873                                 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) {
1874                                         printf("%s: peer %6D: VHT on 2GHz, ignoring\n",
1875                                             __func__,
1876                                             ni->ni_macaddr,
1877                                             ":");
1878                                 } else {
1879                                         ieee80211_vht_node_init(ni);
1880                                         ieee80211_vht_updateparams(ni, vhtcap, vhtopmode);
1881                                         ieee80211_setup_vht_rates(ni, vhtcap, vhtopmode);
1882                                 }
1883                         }
1884
1885                         ieee80211_ht_updateparams_final(ni, htcap, htinfo);
1886                         ieee80211_setup_htrates(ni, htcap,
1887                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1888                         ieee80211_setup_basic_htrates(ni, htinfo);
1889
1890                         ieee80211_node_setuptxparms(ni);
1891                         ieee80211_ratectl_node_init(ni);
1892                 }
1893
1894                 /*
1895                  * Always initialise FF/superg state; we can use this
1896                  * for doing A-MSDU encapsulation as well.
1897                  */
1898 #ifdef  IEEE80211_SUPPORT_SUPERG
1899                 ieee80211_ff_node_init(ni);
1900 #endif
1901
1902                 /*
1903                  * Configure state now that we are associated.
1904                  *
1905                  * XXX may need different/additional driver callbacks?
1906                  */
1907                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1908                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1909                         vap->iv_flags |= IEEE80211_F_SHPREAMBLE;
1910                         vap->iv_flags &= ~IEEE80211_F_USEBARKER;
1911                 } else {
1912                         vap->iv_flags &= ~IEEE80211_F_SHPREAMBLE;
1913                         vap->iv_flags |= IEEE80211_F_USEBARKER;
1914                 }
1915                 ieee80211_vap_set_shortslottime(vap,
1916                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1917                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1918                 ieee80211_vap_update_preamble(vap);
1919                 /*
1920                  * Honor ERP protection.
1921                  *
1922                  * NB: ni_erp should zero for non-11g operation.
1923                  */
1924                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1925                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1926                         vap->iv_flags |= IEEE80211_F_USEPROT;
1927                 else
1928                         vap->iv_flags &= ~IEEE80211_F_USEPROT;
1929                 ieee80211_vap_update_erp_protmode(vap);
1930                 IEEE80211_NOTE_MAC(vap,
1931                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1932                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s%s",
1933                     ISREASSOC(subtype) ? "re" : "",
1934                     IEEE80211_NODE_AID(ni),
1935                     vap->iv_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1936                     vap->iv_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1937                     vap->iv_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1938                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1939                     ni->ni_flags & IEEE80211_NODE_HT ?
1940                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1941                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1942                     ni->ni_flags & IEEE80211_NODE_AMSDU ? " (+AMSDU)" : "",
1943                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1944                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1945                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1946                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1947                         ", fast-frames" : "",
1948                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1949                         ", turbo" : ""
1950                 );
1951                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1952                 break;
1953         }
1954
1955         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1956                 uint16_t reason;
1957
1958                 if (vap->iv_state == IEEE80211_S_SCAN) {
1959                         vap->iv_stats.is_rx_mgtdiscard++;
1960                         return;
1961                 }
1962                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1963                         /* NB: can happen when in promiscuous mode */
1964                         vap->iv_stats.is_rx_mgtdiscard++;
1965                         break;
1966                 }
1967
1968                 /*
1969                  * deauth frame format
1970                  *      [2] reason
1971                  */
1972                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1973                 reason = le16toh(*(uint16_t *)frm);
1974
1975                 vap->iv_stats.is_rx_deauth++;
1976                 vap->iv_stats.is_rx_deauth_code = reason;
1977                 IEEE80211_NODE_STAT(ni, rx_deauth);
1978
1979                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1980                     "recv deauthenticate (reason: %d (%s))", reason,
1981                     ieee80211_reason_to_string(reason));
1982                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1983                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1984                 break;
1985         }
1986
1987         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1988                 uint16_t reason;
1989
1990                 if (vap->iv_state != IEEE80211_S_RUN &&
1991                     vap->iv_state != IEEE80211_S_ASSOC &&
1992                     vap->iv_state != IEEE80211_S_AUTH) {
1993                         vap->iv_stats.is_rx_mgtdiscard++;
1994                         return;
1995                 }
1996                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1997                         /* NB: can happen when in promiscuous mode */
1998                         vap->iv_stats.is_rx_mgtdiscard++;
1999                         break;
2000                 }
2001
2002                 /*
2003                  * disassoc frame format
2004                  *      [2] reason
2005                  */
2006                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2007                 reason = le16toh(*(uint16_t *)frm);
2008
2009                 vap->iv_stats.is_rx_disassoc++;
2010                 vap->iv_stats.is_rx_disassoc_code = reason;
2011                 IEEE80211_NODE_STAT(ni, rx_disassoc);
2012
2013                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2014                     "recv disassociate (reason: %d (%s))", reason,
2015                     ieee80211_reason_to_string(reason));
2016                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
2017                 break;
2018         }
2019
2020         case IEEE80211_FC0_SUBTYPE_ACTION:
2021         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2022                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2023                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2024                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2025                             wh, NULL, "%s", "not for us");
2026                         vap->iv_stats.is_rx_mgtdiscard++;
2027                 } else if (vap->iv_state != IEEE80211_S_RUN) {
2028                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2029                             wh, NULL, "wrong state %s",
2030                             ieee80211_state_name[vap->iv_state]);
2031                         vap->iv_stats.is_rx_mgtdiscard++;
2032                 } else {
2033                         if (ieee80211_parse_action(ni, m0) == 0)
2034                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2035                 }
2036                 break;
2037
2038         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2039         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2040         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
2041         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2042         case IEEE80211_FC0_SUBTYPE_ATIM:
2043                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2044                     wh, NULL, "%s", "not handled");
2045                 vap->iv_stats.is_rx_mgtdiscard++;
2046                 break;
2047
2048         default:
2049                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2050                     wh, "mgt", "subtype 0x%x not handled", subtype);
2051                 vap->iv_stats.is_rx_badsubtype++;
2052                 break;
2053         }
2054 #undef ISREASSOC
2055 }
2056
2057 static void
2058 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2059 {
2060         switch (subtype) {
2061         case IEEE80211_FC0_SUBTYPE_BAR:
2062                 ieee80211_recv_bar(ni, m);
2063                 break;
2064         }
2065 }