sys/net80211/ieee80211_sta.c

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