sys/netproto/802_11/wlan/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  * $FreeBSD: head/sys/net80211/ieee80211_sta.c 203422 2010-02-03 10:07:43Z rpaulo $
  26  * $DragonFly$
  27  */
  28
  29 /*
  30  * IEEE 802.11 Station mode support.
  31  */
  32 #include "opt_inet.h"
  33 #include "opt_wlan.h"
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/malloc.h>
  39 #include <sys/kernel.h>
  40
  41 #include <sys/socket.h>
  42 #include <sys/sockio.h>
  43 #include <sys/endian.h>
  44 #include <sys/errno.h>
  45 #include <sys/proc.h>
  46 #include <sys/sysctl.h>
  47
  48 #include <net/if.h>
  49 #include <net/if_media.h>
  50 #include <net/if_llc.h>
  51 #include <net/ethernet.h>
  52 #include <net/route.h>
  53
  54 #include <net/bpf.h>
  55
  56 #include <netproto/802_11/ieee80211_var.h>
  57 #include <netproto/802_11/ieee80211_sta.h>
  58 #include <netproto/802_11/ieee80211_input.h>
  59 #ifdef IEEE80211_SUPPORT_SUPERG
  60 #include <netproto/802_11/ieee80211_superg.h>
  61 #endif
  62
  63 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  64
  65 static  void sta_vattach(struct ieee80211vap *);
  66 static  void sta_beacon_miss(struct ieee80211vap *);
  67 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  68 static  int sta_input(struct ieee80211_node *, struct mbuf *, int, int);
  69 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  70             int subtype, int rssi, int nf);
  71 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  72
  73 void
  74 ieee80211_sta_attach(struct ieee80211com *ic)
  75 {
  76         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  77 }
  78
  79 void
  80 ieee80211_sta_detach(struct ieee80211com *ic)
  81 {
  82 }
  83
  84 static void
  85 sta_vdetach(struct ieee80211vap *vap)
  86 {
  87 }
  88
  89 static void
  90 sta_vattach(struct ieee80211vap *vap)
  91 {
  92         vap->iv_newstate = sta_newstate;
  93         vap->iv_input = sta_input;
  94         vap->iv_recv_mgmt = sta_recv_mgmt;
  95         vap->iv_recv_ctl = sta_recv_ctl;
  96         vap->iv_opdetach = sta_vdetach;
  97         vap->iv_bmiss = sta_beacon_miss;
  98 }
  99
 100 /*
 101  * Handle a beacon miss event.  The common code filters out
 102  * spurious events that can happen when scanning and/or before
 103  * reaching RUN state.
 104  */
 105 static void
 106 sta_beacon_miss(struct ieee80211vap *vap)
 107 {
 108         struct ieee80211com *ic = vap->iv_ic;
 109
 110         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 111         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 112             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 113
 114         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 115             "beacon miss, mode %s state %s\n",
 116             ieee80211_opmode_name[vap->iv_opmode],
 117             ieee80211_state_name[vap->iv_state]);
 118
 119         if (vap->iv_state == IEEE80211_S_CSA) {
 120                 /*
 121                  * A Channel Switch is pending; assume we missed the
 122                  * beacon that would've completed the process and just
 123                  * force the switch.  If we made a mistake we'll not
 124                  * find the AP on the new channel and fall back to a
 125                  * normal scan.
 126                  */
 127                 ieee80211_csa_completeswitch(ic);
 128                 return;
 129         }
 130         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 131                 /*
 132                  * Send a directed probe req before falling back to a
 133                  * scan; if we receive a response ic_bmiss_count will
 134                  * be reset.  Some cards mistakenly report beacon miss
 135                  * so this avoids the expensive scan if the ap is
 136                  * still there.
 137                  */
 138                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 139                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 140                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 141                 return;
 142         }
 143         vap->iv_bmiss_count = 0;
 144         vap->iv_stats.is_beacon_miss++;
 145         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 146 #ifdef IEEE80211_SUPPORT_SUPERG
 147                 struct ieee80211com *ic = vap->iv_ic;
 148
 149                 /*
 150                  * If we receive a beacon miss interrupt when using
 151                  * dynamic turbo, attempt to switch modes before
 152                  * reassociating.
 153                  */
 154                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 155                         ieee80211_dturbo_switch(vap,
 156                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 157 #endif
 158                 /*
 159                  * Try to reassociate before scanning for a new ap.
 160                  */
 161                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 162         } else {
 163                 /*
 164                  * Somebody else is controlling state changes (e.g.
 165                  * a user-mode app) don't do anything that would
 166                  * confuse them; just drop into scan mode so they'll
 167                  * notified of the state change and given control.
 168                  */
 169                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 170         }
 171 }
 172
 173 /*
 174  * Handle deauth with reason.  We retry only for
 175  * the cases where we might succeed.  Otherwise
 176  * we downgrade the ap and scan.
 177  */
 178 static void
 179 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 180 {
 181         switch (reason) {
 182         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 183         case IEEE80211_STATUS_TIMEOUT:
 184         case IEEE80211_REASON_ASSOC_EXPIRE:
 185         case IEEE80211_REASON_NOT_AUTHED:
 186         case IEEE80211_REASON_NOT_ASSOCED:
 187         case IEEE80211_REASON_ASSOC_LEAVE:
 188         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 189                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 190                 break;
 191         default:
 192                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 193                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 194                         ieee80211_check_scan_current(vap);
 195                 break;
 196         }
 197 }
 198
 199 /*
 200  * IEEE80211_M_STA vap state machine handler.
 201  * This routine handles the main states in the 802.11 protocol.
 202  */
 203 static int
 204 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 205 {
 206         struct ieee80211com *ic = vap->iv_ic;
 207         struct ieee80211_node *ni;
 208         enum ieee80211_state ostate;
 209
 210         ostate = vap->iv_state;
 211         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 212             __func__, ieee80211_state_name[ostate],
 213             ieee80211_state_name[nstate], arg);
 214         vap->iv_state = nstate;                 /* state transition */
 215         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 216         if (ostate != IEEE80211_S_SCAN)
 217                 ieee80211_cancel_scan(vap);     /* background scan */
 218         ni = vap->iv_bss;                       /* NB: no reference held */
 219         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 220                 callout_stop(&vap->iv_swbmiss);
 221         switch (nstate) {
 222         case IEEE80211_S_INIT:
 223                 switch (ostate) {
 224                 case IEEE80211_S_SLEEP:
 225                         /* XXX wakeup */
 226                 case IEEE80211_S_RUN:
 227                         IEEE80211_SEND_MGMT(ni,
 228                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 229                             IEEE80211_REASON_ASSOC_LEAVE);
 230                         ieee80211_sta_leave(ni);
 231                         break;
 232                 case IEEE80211_S_ASSOC:
 233                         IEEE80211_SEND_MGMT(ni,
 234                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 235                             IEEE80211_REASON_AUTH_LEAVE);
 236                         break;
 237                 case IEEE80211_S_SCAN:
 238                         ieee80211_cancel_scan(vap);
 239                         break;
 240                 default:
 241                         goto invalid;
 242                 }
 243                 if (ostate != IEEE80211_S_INIT) {
 244                         /* NB: optimize INIT -> INIT case */
 245                         ieee80211_reset_bss(vap);
 246                 }
 247                 if (vap->iv_auth->ia_detach != NULL)
 248                         vap->iv_auth->ia_detach(vap);
 249                 break;
 250         case IEEE80211_S_SCAN:
 251                 switch (ostate) {
 252                 case IEEE80211_S_INIT:
 253                         /*
 254                          * Initiate a scan.  We can come here as a result
 255                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 256                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 257                          * and the scan request parameters will be present
 258                          * in iv_scanreq.  Otherwise we do the default.
 259                          */
 260                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 261                                 ieee80211_check_scan(vap,
 262                                     vap->iv_scanreq_flags,
 263                                     vap->iv_scanreq_duration,
 264                                     vap->iv_scanreq_mindwell,
 265                                     vap->iv_scanreq_maxdwell,
 266                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 267                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 268                         } else
 269                                 ieee80211_check_scan_current(vap);
 270                         break;
 271                 case IEEE80211_S_SCAN:
 272                 case IEEE80211_S_AUTH:
 273                 case IEEE80211_S_ASSOC:
 274                         /*
 275                          * These can happen either because of a timeout
 276                          * on an assoc/auth response or because of a
 277                          * change in state that requires a reset.  For
 278                          * the former we're called with a non-zero arg
 279                          * that is the cause for the failure; pass this
 280                          * to the scan code so it can update state.
 281                          * Otherwise trigger a new scan unless we're in
 282                          * manual roaming mode in which case an application
 283                          * must issue an explicit scan request.
 284                          */
 285                         if (arg != 0)
 286                                 ieee80211_scan_assoc_fail(vap,
 287                                         vap->iv_bss->ni_macaddr, arg);
 288                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 289                                 ieee80211_check_scan_current(vap);
 290                         break;
 291                 case IEEE80211_S_RUN:           /* beacon miss */
 292                         /*
 293                          * Beacon miss.  Notify user space and if not
 294                          * under control of a user application (roaming
 295                          * manual) kick off a scan to re-connect.
 296                          */
 297                         ieee80211_sta_leave(ni);
 298                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 299                                 ieee80211_check_scan_current(vap);
 300                         break;
 301                 default:
 302                         goto invalid;
 303                 }
 304                 break;
 305         case IEEE80211_S_AUTH:
 306                 switch (ostate) {
 307                 case IEEE80211_S_INIT:
 308                 case IEEE80211_S_SCAN:
 309                         IEEE80211_SEND_MGMT(ni,
 310                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 311                         break;
 312                 case IEEE80211_S_AUTH:
 313                 case IEEE80211_S_ASSOC:
 314                         switch (arg & 0xff) {
 315                         case IEEE80211_FC0_SUBTYPE_AUTH:
 316                                 /* ??? */
 317                                 IEEE80211_SEND_MGMT(ni,
 318                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 319                                 break;
 320                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 321                                 sta_authretry(vap, ni, arg>>8);
 322                                 break;
 323                         }
 324                         break;
 325                 case IEEE80211_S_RUN:
 326                         switch (arg & 0xff) {
 327                         case IEEE80211_FC0_SUBTYPE_AUTH:
 328                                 IEEE80211_SEND_MGMT(ni,
 329                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 330                                 vap->iv_state = ostate; /* stay RUN */
 331                                 break;
 332                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 333                                 ieee80211_sta_leave(ni);
 334                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 335                                         /* try to reauth */
 336                                         IEEE80211_SEND_MGMT(ni,
 337                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 338                                 }
 339                                 break;
 340                         }
 341                         break;
 342                 default:
 343                         goto invalid;
 344                 }
 345                 break;
 346         case IEEE80211_S_ASSOC:
 347                 switch (ostate) {
 348                 case IEEE80211_S_AUTH:
 349                 case IEEE80211_S_ASSOC:
 350                         IEEE80211_SEND_MGMT(ni,
 351                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 352                         break;
 353                 case IEEE80211_S_SLEEP:         /* cannot happen */
 354                 case IEEE80211_S_RUN:
 355                         ieee80211_sta_leave(ni);
 356                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 357                                 IEEE80211_SEND_MGMT(ni, arg ?
 358                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 359                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 360                         }
 361                         break;
 362                 default:
 363                         goto invalid;
 364                 }
 365                 break;
 366         case IEEE80211_S_RUN:
 367                 if (vap->iv_flags & IEEE80211_F_WPA) {
 368                         /* XXX validate prerequisites */
 369                 }
 370                 switch (ostate) {
 371                 case IEEE80211_S_RUN:
 372                 case IEEE80211_S_CSA:
 373                         break;
 374                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 375                 case IEEE80211_S_ASSOC:
 376 #ifdef IEEE80211_DEBUG
 377                         if (ieee80211_msg_debug(vap)) {
 378                                 ieee80211_note(vap, "%s with %6D ssid ",
 379                                     (vap->iv_opmode == IEEE80211_M_STA ?
 380                                     "associated" : "synchronized"),
 381                                     ni->ni_bssid, ":");
 382                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 383                                     ni->ni_esslen);
 384                                 /* XXX MCS/HT */
 385                                 kprintf(" channel %d start %uMb\n",
 386                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 387                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 388                         }
 389 #endif
 390                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 391                         ieee80211_notify_node_join(ni,
 392                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 393                         break;
 394                 case IEEE80211_S_SLEEP:
 395                         ieee80211_sta_pwrsave(vap, 0);
 396                         break;
 397                 default:
 398                         goto invalid;
 399                 }
 400                 ieee80211_sync_curchan(ic);
 401                 if (ostate != IEEE80211_S_RUN &&
 402                     (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
 403                         /*
 404                          * Start s/w beacon miss timer for devices w/o
 405                          * hardware support.  We fudge a bit here since
 406                          * we're doing this in software.
 407                          */
 408                         vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 409                                 2 * vap->iv_bmissthreshold * ni->ni_intval);
 410                         vap->iv_swbmiss_count = 0;
 411                         callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 412                                       ieee80211_swbmiss_callout, vap);
 413                 }
 414                 /*
 415                  * When 802.1x is not in use mark the port authorized
 416                  * at this point so traffic can flow.
 417                  */
 418                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 419                         ieee80211_node_authorize(ni);
 420                 /*
 421                  * Fake association when joining an existing bss.
 422                  */
 423                 if (ic->ic_newassoc != NULL)
 424                         ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
 425                 break;
 426         case IEEE80211_S_CSA:
 427                 if (ostate != IEEE80211_S_RUN)
 428                         goto invalid;
 429                 break;
 430         case IEEE80211_S_SLEEP:
 431                 ieee80211_sta_pwrsave(vap, 1);
 432                 break;
 433         default:
 434         invalid:
 435                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 436                     "%s: unexpected state transition %s -> %s\n", __func__,
 437                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 438                 break;
 439         }
 440         return 0;
 441 }
 442
 443 /*
 444  * Return non-zero if the frame is an echo of a multicast
 445  * frame sent by ourself.  The dir is known to be DSTODS.
 446  */
 447 static __inline int
 448 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 449 {
 450 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 451 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 452         const uint8_t *sa;
 453
 454         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 455
 456         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 457                 return 0;
 458         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 459         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 460 #undef WH4
 461 #undef QWH4
 462 }
 463
 464 /*
 465  * Return non-zero if the frame is an echo of a multicast
 466  * frame sent by ourself.  The dir is known to be FROMDS.
 467  */
 468 static __inline int
 469 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 470 {
 471         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 472
 473         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 474                 return 0;
 475         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 476 }
 477
 478 /*
 479  * Decide if a received management frame should be
 480  * printed when debugging is enabled.  This filters some
 481  * of the less interesting frames that come frequently
 482  * (e.g. beacons).
 483  */
 484 static __inline int
 485 doprint(struct ieee80211vap *vap, int subtype)
 486 {
 487         switch (subtype) {
 488         case IEEE80211_FC0_SUBTYPE_BEACON:
 489                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 490         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 491                 return 0;
 492         }
 493         return 1;
 494 }
 495
 496 /*
 497  * Process a received frame.  The node associated with the sender
 498  * should be supplied.  If nothing was found in the node table then
 499  * the caller is assumed to supply a reference to iv_bss instead.
 500  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 501  * during AP scanning to select a AP to associate with; it can have
 502  * any units so long as values have consistent units and higher values
 503  * mean ``better signal''.  The receive timestamp is currently not used
 504  * by the 802.11 layer.
 505  */
 506 static int
 507 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 508 {
 509 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 510 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 511         struct ieee80211vap *vap = ni->ni_vap;
 512         struct ieee80211com *ic = ni->ni_ic;
 513         struct ifnet *ifp = vap->iv_ifp;
 514         struct ieee80211_frame *wh;
 515         struct ieee80211_key *key;
 516         struct ether_header *eh;
 517         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 518         uint8_t dir, type, subtype, qos;
 519         uint8_t *bssid;
 520         uint16_t rxseq;
 521
 522         if (m->m_flags & M_AMPDU_MPDU) {
 523                 /*
 524                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 525                  * w/ M_AMPDU_MPDU marked have already passed through
 526                  * here but were received out of order and been held on
 527                  * the reorder queue.  When resubmitted they are marked
 528                  * with the M_AMPDU_MPDU flag and we can bypass most of
 529                  * the normal processing.
 530                  */
 531                 wh = mtod(m, struct ieee80211_frame *);
 532                 type = IEEE80211_FC0_TYPE_DATA;
 533                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 534                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 535                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 536                 goto resubmit_ampdu;
 537         }
 538
 539         KASSERT(ni != NULL, ("null node"));
 540         ni->ni_inact = ni->ni_inact_reload;
 541
 542         type = -1;                      /* undefined */
 543
 544         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 545                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 546                     ni->ni_macaddr, NULL,
 547                     "too short (1): len %u", m->m_pkthdr.len);
 548                 vap->iv_stats.is_rx_tooshort++;
 549                 goto out;
 550         }
 551         /*
 552          * Bit of a cheat here, we use a pointer for a 3-address
 553          * frame format but don't reference fields past outside
 554          * ieee80211_frame_min w/o first validating the data is
 555          * present.
 556          */
 557         wh = mtod(m, struct ieee80211_frame *);
 558
 559         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 560             IEEE80211_FC0_VERSION_0) {
 561                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 562                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 563                     wh->i_fc[0], wh->i_fc[1]);
 564                 vap->iv_stats.is_rx_badversion++;
 565                 goto err;
 566         }
 567
 568         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 569         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 570         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 571         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 572                 bssid = wh->i_addr2;
 573                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 574                         /* not interested in */
 575                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 576                             bssid, NULL, "%s", "not to bss");
 577                         vap->iv_stats.is_rx_wrongbss++;
 578                         goto out;
 579                 }
 580                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 581                 ni->ni_noise = nf;
 582                 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 583                         uint8_t tid = ieee80211_gettid(wh);
 584                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 585                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 586                                 ic->ic_wme.wme_hipri_traffic++;
 587                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 588                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 589                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 590                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 591                                 /* duplicate, discard */
 592                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 593                                     bssid, "duplicate",
 594                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 595                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 596                                     ni->ni_rxseqs[tid] >>
 597                                         IEEE80211_SEQ_SEQ_SHIFT,
 598                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 599                                     ni->ni_rxseqs[tid] &
 600                                         IEEE80211_SEQ_FRAG_MASK,
 601                                     tid);
 602                                 vap->iv_stats.is_rx_dup++;
 603                                 IEEE80211_NODE_STAT(ni, rx_dup);
 604                                 goto out;
 605                         }
 606                         ni->ni_rxseqs[tid] = rxseq;
 607                 }
 608         }
 609
 610         switch (type) {
 611         case IEEE80211_FC0_TYPE_DATA:
 612                 hdrspace = ieee80211_hdrspace(ic, wh);
 613                 if (m->m_len < hdrspace &&
 614                     (m = m_pullup(m, hdrspace)) == NULL) {
 615                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 616                             ni->ni_macaddr, NULL,
 617                             "data too short: expecting %u", hdrspace);
 618                         vap->iv_stats.is_rx_tooshort++;
 619                         goto out;               /* XXX */
 620                 }
 621                 /*
 622                  * Handle A-MPDU re-ordering.  If the frame is to be
 623                  * processed directly then ieee80211_ampdu_reorder
 624                  * will return 0; otherwise it has consumed the mbuf
 625                  * and we should do nothing more with it.
 626                  */
 627                 if ((m->m_flags & M_AMPDU) &&
 628                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 629                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 630                     ieee80211_ampdu_reorder(ni, m) != 0) {
 631                         m = NULL;
 632                         goto out;
 633                 }
 634         resubmit_ampdu:
 635                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 636                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 637                             isfromds_mcastecho(vap, wh)) {
 638                                 /*
 639                                  * In IEEE802.11 network, multicast
 640                                  * packets sent from "me" are broadcast
 641                                  * from the AP; silently discard for
 642                                  * SIMPLEX interface.
 643                                  */
 644                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 645                                     wh, "data", "%s", "multicast echo");
 646                                 vap->iv_stats.is_rx_mcastecho++;
 647                                 goto out;
 648                         }
 649                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 650                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 651                                 /*
 652                                  * DWDS sta's must drop 3-address mcast frames
 653                                  * as they will be sent separately as a 4-addr
 654                                  * frame.  Accepting the 3-addr frame will
 655                                  * confuse the bridge into thinking the sending
 656                                  * sta is located at the end of WDS link.
 657                                  */
 658                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 659                                     "3-address data", "%s", "DWDS enabled");
 660                                 vap->iv_stats.is_rx_mcastecho++;
 661                                 goto out;
 662                         }
 663                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 664                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 665                                 IEEE80211_DISCARD(vap,
 666                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 667                                     "%s", "DWDS not enabled");
 668                                 vap->iv_stats.is_rx_wrongdir++;
 669                                 goto out;
 670                         }
 671                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 672                             isdstods_mcastecho(vap, wh)) {
 673                                 /*
 674                                  * In IEEE802.11 network, multicast
 675                                  * packets sent from "me" are broadcast
 676                                  * from the AP; silently discard for
 677                                  * SIMPLEX interface.
 678                                  */
 679                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 680                                     "4-address data", "%s", "multicast echo");
 681                                 vap->iv_stats.is_rx_mcastecho++;
 682                                 goto out;
 683                         }
 684                 } else {
 685                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 686                             "data", "incorrect dir 0x%x", dir);
 687                         vap->iv_stats.is_rx_wrongdir++;
 688                         goto out;
 689                 }
 690
 691                 /*
 692                  * Handle privacy requirements.  Note that we
 693                  * must not be preempted from here until after
 694                  * we (potentially) call ieee80211_crypto_demic;
 695                  * otherwise we may violate assumptions in the
 696                  * crypto cipher modules used to do delayed update
 697                  * of replay sequence numbers.
 698                  */
 699                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 700                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 701                                 /*
 702                                  * Discard encrypted frames when privacy is off.
 703                                  */
 704                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 705                                     wh, "WEP", "%s", "PRIVACY off");
 706                                 vap->iv_stats.is_rx_noprivacy++;
 707                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 708                                 goto out;
 709                         }
 710                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 711                         if (key == NULL) {
 712                                 /* NB: stats+msgs handled in crypto_decap */
 713                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 714                                 goto out;
 715                         }
 716                         wh = mtod(m, struct ieee80211_frame *);
 717                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 718                 } else {
 719                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 720                         key = NULL;
 721                 }
 722
 723                 /*
 724                  * Save QoS bits for use below--before we strip the header.
 725                  */
 726                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 727                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 728                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 729                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 730                 } else
 731                         qos = 0;
 732
 733                 /*
 734                  * Next up, any fragmentation.
 735                  */
 736                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 737                         m = ieee80211_defrag(ni, m, hdrspace);
 738                         if (m == NULL) {
 739                                 /* Fragment dropped or frame not complete yet */
 740                                 goto out;
 741                         }
 742                 }
 743                 wh = NULL;              /* no longer valid, catch any uses */
 744
 745                 /*
 746                  * Next strip any MSDU crypto bits.
 747                  */
 748                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 749                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 750                             ni->ni_macaddr, "data", "%s", "demic error");
 751                         vap->iv_stats.is_rx_demicfail++;
 752                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 753                         goto out;
 754                 }
 755
 756                 /* copy to listener after decrypt */
 757                 if (ieee80211_radiotap_active_vap(vap))
 758                         ieee80211_radiotap_rx(vap, m);
 759                 need_tap = 0;
 760
 761                 /*
 762                  * Finally, strip the 802.11 header.
 763                  */
 764                 m = ieee80211_decap(vap, m, hdrspace);
 765                 if (m == NULL) {
 766                         /* XXX mask bit to check for both */
 767                         /* don't count Null data frames as errors */
 768                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 769                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 770                                 goto out;
 771                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 772                             ni->ni_macaddr, "data", "%s", "decap error");
 773                         vap->iv_stats.is_rx_decap++;
 774                         IEEE80211_NODE_STAT(ni, rx_decap);
 775                         goto err;
 776                 }
 777                 eh = mtod(m, struct ether_header *);
 778                 if (!ieee80211_node_is_authorized(ni)) {
 779                         /*
 780                          * Deny any non-PAE frames received prior to
 781                          * authorization.  For open/shared-key
 782                          * authentication the port is mark authorized
 783                          * after authentication completes.  For 802.1x
 784                          * the port is not marked authorized by the
 785                          * authenticator until the handshake has completed.
 786                          */
 787                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 788                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 789                                     eh->ether_shost, "data",
 790                                     "unauthorized port: ether type 0x%x len %u",
 791                                     eh->ether_type, m->m_pkthdr.len);
 792                                 vap->iv_stats.is_rx_unauth++;
 793                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 794                                 goto err;
 795                         }
 796                 } else {
 797                         /*
 798                          * When denying unencrypted frames, discard
 799                          * any non-PAE frames received without encryption.
 800                          */
 801                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 802                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 803                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 804                                 /*
 805                                  * Drop unencrypted frames.
 806                                  */
 807                                 vap->iv_stats.is_rx_unencrypted++;
 808                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 809                                 goto out;
 810                         }
 811                 }
 812                 /* XXX require HT? */
 813                 if (qos & IEEE80211_QOS_AMSDU) {
 814                         m = ieee80211_decap_amsdu(ni, m);
 815                         if (m == NULL)
 816                                 return IEEE80211_FC0_TYPE_DATA;
 817                 } else {
 818 #ifdef IEEE80211_SUPPORT_SUPERG
 819                         m = ieee80211_decap_fastframe(vap, ni, m);
 820                         if (m == NULL)
 821                                 return IEEE80211_FC0_TYPE_DATA;
 822 #endif
 823                 }
 824                 ieee80211_deliver_data(vap, ni, m);
 825                 return IEEE80211_FC0_TYPE_DATA;
 826
 827         case IEEE80211_FC0_TYPE_MGT:
 828                 vap->iv_stats.is_rx_mgmt++;
 829                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 830                 if (dir != IEEE80211_FC1_DIR_NODS) {
 831                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 832                             wh, "data", "incorrect dir 0x%x", dir);
 833                         vap->iv_stats.is_rx_wrongdir++;
 834                         goto err;
 835                 }
 836                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 837                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 838                             ni->ni_macaddr, "mgt", "too short: len %u",
 839                             m->m_pkthdr.len);
 840                         vap->iv_stats.is_rx_tooshort++;
 841                         goto out;
 842                 }
 843 #ifdef IEEE80211_DEBUG
 844                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 845                     ieee80211_msg_dumppkts(vap)) {
 846                         if_printf(ifp, "received %s from %6D rssi %d\n",
 847                             ieee80211_mgt_subtype_name[subtype >>
 848                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 849                             wh->i_addr2, ":", rssi);
 850                 }
 851 #endif
 852                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 853                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 854                                 /*
 855                                  * Only shared key auth frames with a challenge
 856                                  * should be encrypted, discard all others.
 857                                  */
 858                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 859                                     wh, ieee80211_mgt_subtype_name[subtype >>
 860                                         IEEE80211_FC0_SUBTYPE_SHIFT],
 861                                     "%s", "WEP set but not permitted");
 862                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 863                                 goto out;
 864                         }
 865                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 866                                 /*
 867                                  * Discard encrypted frames when privacy is off.
 868                                  */
 869                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 870                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 871                                 vap->iv_stats.is_rx_noprivacy++;
 872                                 goto out;
 873                         }
 874                         hdrspace = ieee80211_hdrspace(ic, wh);
 875                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 876                         if (key == NULL) {
 877                                 /* NB: stats+msgs handled in crypto_decap */
 878                                 goto out;
 879                         }
 880                         wh = mtod(m, struct ieee80211_frame *);
 881                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 882                 }
 883                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 884                 goto out;
 885
 886         case IEEE80211_FC0_TYPE_CTL:
 887                 vap->iv_stats.is_rx_ctl++;
 888                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 889                 vap->iv_recv_ctl(ni, m, subtype);
 890                 goto out;
 891
 892         default:
 893                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 894                     wh, NULL, "bad frame type 0x%x", type);
 895                 /* should not come here */
 896                 break;
 897         }
 898 err:
 899         ifp->if_ierrors++;
 900 out:
 901         if (m != NULL) {
 902                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 903                         ieee80211_radiotap_rx(vap, m);
 904                 m_freem(m);
 905         }
 906         return type;
 907 #undef SEQ_LEQ
 908 }
 909
 910 static void
 911 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 912     int rssi, int nf, uint16_t seq, uint16_t status)
 913 {
 914         struct ieee80211vap *vap = ni->ni_vap;
 915
 916         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 917                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 918                     ni->ni_macaddr, "open auth",
 919                     "bad sta auth mode %u", ni->ni_authmode);
 920                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 921                 return;
 922         }
 923         if (vap->iv_state != IEEE80211_S_AUTH ||
 924             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
 925                 vap->iv_stats.is_rx_bad_auth++;
 926                 return;
 927         }
 928         if (status != 0) {
 929                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 930                     ni, "open auth failed (reason %d)", status);
 931                 vap->iv_stats.is_rx_auth_fail++;
 932                 vap->iv_stats.is_rx_authfail_code = status;
 933                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 934                     IEEE80211_SCAN_FAIL_STATUS);
 935         } else
 936                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 937 }
 938
 939 static void
 940 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 941     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 942     uint16_t seq, uint16_t status)
 943 {
 944         struct ieee80211vap *vap = ni->ni_vap;
 945         uint8_t *challenge;
 946         int estatus;
 947
 948         /*
 949          * NB: this can happen as we allow pre-shared key
 950          * authentication to be enabled w/o wep being turned
 951          * on so that configuration of these can be done
 952          * in any order.  It may be better to enforce the
 953          * ordering in which case this check would just be
 954          * for sanity/consistency.
 955          */
 956         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 957                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 958                     ni->ni_macaddr, "shared key auth",
 959                     "%s", " PRIVACY is disabled");
 960                 estatus = IEEE80211_STATUS_ALG;
 961                 goto bad;
 962         }
 963         /*
 964          * Pre-shared key authentication is evil; accept
 965          * it only if explicitly configured (it is supported
 966          * mainly for compatibility with clients like OS X).
 967          */
 968         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
 969             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
 970                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 971                     ni->ni_macaddr, "shared key auth",
 972                     "bad sta auth mode %u", ni->ni_authmode);
 973                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
 974                 estatus = IEEE80211_STATUS_ALG;
 975                 goto bad;
 976         }
 977
 978         challenge = NULL;
 979         if (frm + 1 < efrm) {
 980                 if ((frm[1] + 2) > (efrm - frm)) {
 981                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 982                             ni->ni_macaddr, "shared key auth",
 983                             "ie %d/%d too long",
 984                             frm[0], (int)((frm[1] + 2) - (efrm - frm)));
 985                         vap->iv_stats.is_rx_bad_auth++;
 986                         estatus = IEEE80211_STATUS_CHALLENGE;
 987                         goto bad;
 988                 }
 989                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
 990                         challenge = frm;
 991                 frm += frm[1] + 2;
 992         }
 993         switch (seq) {
 994         case IEEE80211_AUTH_SHARED_CHALLENGE:
 995         case IEEE80211_AUTH_SHARED_RESPONSE:
 996                 if (challenge == NULL) {
 997                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 998                             ni->ni_macaddr, "shared key auth",
 999                             "%s", "no challenge");
1000                         vap->iv_stats.is_rx_bad_auth++;
1001                         estatus = IEEE80211_STATUS_CHALLENGE;
1002                         goto bad;
1003                 }
1004                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1005                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1006                             ni->ni_macaddr, "shared key auth",
1007                             "bad challenge len %d", challenge[1]);
1008                         vap->iv_stats.is_rx_bad_auth++;
1009                         estatus = IEEE80211_STATUS_CHALLENGE;
1010                         goto bad;
1011                 }
1012         default:
1013                 break;
1014         }
1015         if (vap->iv_state != IEEE80211_S_AUTH)
1016                 return;
1017         switch (seq) {
1018         case IEEE80211_AUTH_SHARED_PASS:
1019                 if (ni->ni_challenge != NULL) {
1020                         kfree(ni->ni_challenge, M_80211_NODE);
1021                         ni->ni_challenge = NULL;
1022                 }
1023                 if (status != 0) {
1024                         IEEE80211_NOTE_FRAME(vap,
1025                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1026                             "shared key auth failed (reason %d)", status);
1027                         vap->iv_stats.is_rx_auth_fail++;
1028                         vap->iv_stats.is_rx_authfail_code = status;
1029                         return;
1030                 }
1031                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1032                 break;
1033         case IEEE80211_AUTH_SHARED_CHALLENGE:
1034                 if (!ieee80211_alloc_challenge(ni))
1035                         return;
1036                 /* XXX could optimize by passing recvd challenge */
1037                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1038                 IEEE80211_SEND_MGMT(ni,
1039                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1040                 break;
1041         default:
1042                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1043                     wh, "shared key auth", "bad seq %d", seq);
1044                 vap->iv_stats.is_rx_bad_auth++;
1045                 return;
1046         }
1047         return;
1048 bad:
1049         /*
1050          * Kick the state machine.  This short-circuits
1051          * using the mgt frame timeout to trigger the
1052          * state transition.
1053          */
1054         if (vap->iv_state == IEEE80211_S_AUTH)
1055                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1056                     IEEE80211_SCAN_FAIL_STATUS);
1057 }
1058
1059 static int
1060 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1061         const struct ieee80211_frame *wh)
1062 {
1063 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1064         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1065         u_int len = frm[1], qosinfo;
1066         int i;
1067
1068         if (len < sizeof(struct ieee80211_wme_param)-2) {
1069                 IEEE80211_DISCARD_IE(vap,
1070                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1071                     wh, "WME", "too short, len %u", len);
1072                 return -1;
1073         }
1074         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1075         qosinfo &= WME_QOSINFO_COUNT;
1076         /* XXX do proper check for wraparound */
1077         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1078                 return 0;
1079         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1080         for (i = 0; i < WME_NUM_AC; i++) {
1081                 struct wmeParams *wmep =
1082                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1083                 /* NB: ACI not used */
1084                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1085                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1086                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1087                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1088                 wmep->wmep_txopLimit = LE_READ_2(frm+2);
1089                 frm += 4;
1090         }
1091         wme->wme_wmeChanParams.cap_info = qosinfo;
1092         return 1;
1093 #undef MS
1094 }
1095
1096 /*
1097  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1098  * is the first CSA then initiate the switch.  Otherwise we
1099  * track state and trigger completion and/or cancel of the switch.
1100  * XXX should be public for IBSS use
1101  */
1102 static void
1103 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1104         const struct ieee80211_frame *wh)
1105 {
1106         struct ieee80211com *ic = vap->iv_ic;
1107         const struct ieee80211_csa_ie *csa =
1108             (const struct ieee80211_csa_ie *) frm;
1109
1110         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1111             ("state %s", ieee80211_state_name[vap->iv_state]));
1112
1113         if (csa->csa_mode > 1) {
1114                 IEEE80211_DISCARD_IE(vap,
1115                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1116                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1117                 return;
1118         }
1119         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1120                 /*
1121                  * Convert the channel number to a channel reference.  We
1122                  * try first to preserve turbo attribute of the current
1123                  * channel then fallback.  Note this will not work if the
1124                  * CSA specifies a channel that requires a band switch (e.g.
1125                  * 11a => 11g).  This is intentional as 11h is defined only
1126                  * for 5GHz/11a and because the switch does not involve a
1127                  * reassociation, protocol state (capabilities, negotated
1128                  * rates, etc) may/will be wrong.
1129                  */
1130                 struct ieee80211_channel *c =
1131                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1132                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1133                 if (c == NULL) {
1134                         c = ieee80211_find_channel_byieee(ic,
1135                             csa->csa_newchan,
1136                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1137                         if (c == NULL) {
1138                                 IEEE80211_DISCARD_IE(vap,
1139                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1140                                     wh, "CSA", "invalid channel %u",
1141                                     csa->csa_newchan);
1142                                 goto done;
1143                         }
1144                 }
1145 #if IEEE80211_CSA_COUNT_MIN > 0
1146                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1147                         /*
1148                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1149                          * reduce the risk of being redirected by a fabricated
1150                          * CSA.  If a valid CSA is dropped we'll still get a
1151                          * beacon miss when the AP leaves the channel so we'll
1152                          * eventually follow to the new channel.
1153                          *
1154                          * NOTE: this violates the 11h spec that states that
1155                          * count may be any value and if 0 then a switch
1156                          * should happen asap.
1157                          */
1158                         IEEE80211_DISCARD_IE(vap,
1159                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1160                             wh, "CSA", "count %u too small, must be >= %u",
1161                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1162                         goto done;
1163                 }
1164 #endif
1165                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1166         } else {
1167                 /*
1168                  * Validate this ie against the initial CSA.  We require
1169                  * mode and channel not change and the count must be
1170                  * monotonically decreasing.  This may be pointless and
1171                  * canceling the switch as a result may be too paranoid but
1172                  * in the worst case if we drop out of CSA because of this
1173                  * and the AP does move then we'll just end up taking a
1174                  * beacon miss and scan to find the AP.
1175                  *
1176                  * XXX may want <= on count as we also process ProbeResp
1177                  * frames and those may come in w/ the same count as the
1178                  * previous beacon; but doing so leaves us open to a stuck
1179                  * count until we add a dead-man timer
1180                  */
1181                 if (!(csa->csa_count < ic->ic_csa_count &&
1182                       csa->csa_mode == ic->ic_csa_mode &&
1183                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1184                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1185                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1186                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1187                             ic->ic_csa_newchan->ic_ieee, ic->ic_csa_count,
1188                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1189                         ieee80211_csa_cancelswitch(ic);
1190                 } else {
1191                         if (csa->csa_count <= 1)
1192                                 ieee80211_csa_completeswitch(ic);
1193                         else
1194                                 ic->ic_csa_count = csa->csa_count;
1195                 }
1196         }
1197 done:
1198         ;
1199 }
1200
1201 /*
1202  * Return non-zero if a background scan may be continued:
1203  * o bg scan is active
1204  * o no channel switch is pending
1205  * o there has not been any traffic recently
1206  *
1207  * Note we do not check if there is an administrative enable;
1208  * this is only done to start the scan.  We assume that any
1209  * change in state will be accompanied by a request to cancel
1210  * active scans which will otherwise cause this test to fail.
1211  */
1212 static __inline int
1213 contbgscan(struct ieee80211vap *vap)
1214 {
1215         struct ieee80211com *ic = vap->iv_ic;
1216
1217         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1218             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1219             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1220             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1221 }
1222
1223 /*
1224  * Return non-zero if a backgrond scan may be started:
1225  * o bg scanning is administratively enabled
1226  * o no channel switch is pending
1227  * o we are not boosted on a dynamic turbo channel
1228  * o there has not been a scan recently
1229  * o there has not been any traffic recently
1230  */
1231 static __inline int
1232 startbgscan(struct ieee80211vap *vap)
1233 {
1234         struct ieee80211com *ic = vap->iv_ic;
1235
1236         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1237             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1238 #ifdef IEEE80211_SUPPORT_SUPERG
1239             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1240 #endif
1241             time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1242             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1243 }
1244
1245 static void
1246 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1247         int subtype, int rssi, int nf)
1248 {
1249 #define ISPROBE(_st)    ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1250 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1251         struct ieee80211vap *vap = ni->ni_vap;
1252         struct ieee80211com *ic = ni->ni_ic;
1253         struct ieee80211_frame *wh;
1254         uint8_t *frm, *efrm;
1255         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1256         uint8_t rate;
1257
1258         wh = mtod(m0, struct ieee80211_frame *);
1259         frm = (uint8_t *)&wh[1];
1260         efrm = mtod(m0, uint8_t *) + m0->m_len;
1261         switch (subtype) {
1262         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1263         case IEEE80211_FC0_SUBTYPE_BEACON: {
1264                 struct ieee80211_scanparams scan;
1265                 /*
1266                  * We process beacon/probe response frames:
1267                  *    o when scanning, or
1268                  *    o station mode when associated (to collect state
1269                  *      updates such as 802.11g slot time)
1270                  * Frames otherwise received are discarded.
1271                  */
1272                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1273                         vap->iv_stats.is_rx_mgtdiscard++;
1274                         return;
1275                 }
1276                 /* XXX probe response in sta mode when !scanning? */
1277                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
1278                         return;
1279                 /*
1280                  * Count frame now that we know it's to be processed.
1281                  */
1282                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1283                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1284                         IEEE80211_NODE_STAT(ni, rx_beacons);
1285                 } else
1286                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1287                 /*
1288                  * When operating in station mode, check for state updates.
1289                  * Be careful to ignore beacons received while doing a
1290                  * background scan.  We consider only 11g/WMM stuff right now.
1291                  */
1292                 if (ni->ni_associd != 0 &&
1293                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1294                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1295                         /* record tsf of last beacon */
1296                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1297                                 sizeof(ni->ni_tstamp));
1298                         /* count beacon frame for s/w bmiss handling */
1299                         vap->iv_swbmiss_count++;
1300                         vap->iv_bmiss_count = 0;
1301                         if (ni->ni_erp != scan.erp) {
1302                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1303                                     wh->i_addr2,
1304                                     "erp change: was 0x%x, now 0x%x",
1305                                     ni->ni_erp, scan.erp);
1306                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1307                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1308                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1309                                 else
1310                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1311                                 ni->ni_erp = scan.erp;
1312                                 /* XXX statistic */
1313                                 /* XXX driver notification */
1314                         }
1315                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1316                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1317                                     wh->i_addr2,
1318                                     "capabilities change: was 0x%x, now 0x%x",
1319                                     ni->ni_capinfo, scan.capinfo);
1320                                 /*
1321                                  * NB: we assume short preamble doesn't
1322                                  *     change dynamically
1323                                  */
1324                                 ieee80211_set_shortslottime(ic,
1325                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1326                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1327                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1328                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1329                                 /* XXX statistic */
1330                         }
1331                         if (scan.wme != NULL &&
1332                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1333                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1334                                 ieee80211_wme_updateparams(vap);
1335 #ifdef IEEE80211_SUPPORT_SUPERG
1336                         if (scan.ath != NULL)
1337                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1338 #endif
1339                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1340                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1341                                 ieee80211_ht_updateparams(ni,
1342                                     scan.htcap, scan.htinfo);
1343                                 /* XXX state changes? */
1344                         }
1345                         if (scan.tim != NULL) {
1346                                 struct ieee80211_tim_ie *tim =
1347                                     (struct ieee80211_tim_ie *) scan.tim;
1348 #if 0
1349                                 int aid = IEEE80211_AID(ni->ni_associd);
1350                                 int ix = aid / NBBY;
1351                                 int min = tim->tim_bitctl &~ 1;
1352                                 int max = tim->tim_len + min - 4;
1353                                 if ((tim->tim_bitctl&1) ||
1354                                     (min <= ix && ix <= max &&
1355                                      isset(tim->tim_bitmap - min, aid))) {
1356                                         /*
1357                                          * XXX Do not let bg scan kick off
1358                                          * we are expecting data.
1359                                          */
1360                                         ic->ic_lastdata = ticks;
1361                                         ieee80211_sta_pwrsave(vap, 0);
1362                                 }
1363 #endif
1364                                 ni->ni_dtim_count = tim->tim_count;
1365                                 ni->ni_dtim_period = tim->tim_period;
1366                         }
1367                         if (scan.csa != NULL &&
1368                             (vap->iv_flags & IEEE80211_F_DOTH))
1369                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1370                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1371                                 /*
1372                                  * No CSA ie or 11h disabled, but a channel
1373                                  * switch is pending; drop out so we aren't
1374                                  * stuck in CSA state.  If the AP really is
1375                                  * moving we'll get a beacon miss and scan.
1376                                  */
1377                                 ieee80211_csa_cancelswitch(ic);
1378                         }
1379                         /*
1380                          * If scanning, pass the info to the scan module.
1381                          * Otherwise, check if it's the right time to do
1382                          * a background scan.  Background scanning must
1383                          * be enabled and we must not be operating in the
1384                          * turbo phase of dynamic turbo mode.  Then,
1385                          * it's been a while since the last background
1386                          * scan and if no data frames have come through
1387                          * recently, kick off a scan.  Note that this
1388                          * is the mechanism by which a background scan
1389                          * is started _and_ continued each time we
1390                          * return on-channel to receive a beacon from
1391                          * our ap.
1392                          */
1393                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1394                                 ieee80211_add_scan(vap, &scan, wh,
1395                                         subtype, rssi, nf);
1396                         } else if (contbgscan(vap)) {
1397                                 ieee80211_bg_scan(vap, 0);
1398                         } else if (startbgscan(vap)) {
1399                                 vap->iv_stats.is_scan_bg++;
1400 #if 0
1401                                 /* wakeup if we are sleeing */
1402                                 ieee80211_set_pwrsave(vap, 0);
1403 #endif
1404                                 ieee80211_bg_scan(vap, 0);
1405                         }
1406                         return;
1407                 }
1408                 /*
1409                  * If scanning, just pass information to the scan module.
1410                  */
1411                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1412                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1413                                 /*
1414                                  * Actively scanning a channel marked passive;
1415                                  * send a probe request now that we know there
1416                                  * is 802.11 traffic present.
1417                                  *
1418                                  * XXX check if the beacon we recv'd gives
1419                                  * us what we need and suppress the probe req
1420                                  */
1421                                 ieee80211_probe_curchan(vap, 1);
1422                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1423                         }
1424                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1425                         return;
1426                 }
1427                 break;
1428         }
1429
1430         case IEEE80211_FC0_SUBTYPE_AUTH: {
1431                 uint16_t algo, seq, status;
1432                 /*
1433                  * auth frame format
1434                  *      [2] algorithm
1435                  *      [2] sequence
1436                  *      [2] status
1437                  *      [tlv*] challenge
1438                  */
1439                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1440                 algo   = le16toh(*(uint16_t *)frm);
1441                 seq    = le16toh(*(uint16_t *)(frm + 2));
1442                 status = le16toh(*(uint16_t *)(frm + 4));
1443                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1444                     "recv auth frame with algorithm %d seq %d", algo, seq);
1445
1446                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1447                         IEEE80211_DISCARD(vap,
1448                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1449                             wh, "auth", "%s", "TKIP countermeasures enabled");
1450                         vap->iv_stats.is_rx_auth_countermeasures++;
1451                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1452                                 ieee80211_send_error(ni, wh->i_addr2,
1453                                         IEEE80211_FC0_SUBTYPE_AUTH,
1454                                         IEEE80211_REASON_MIC_FAILURE);
1455                         }
1456                         return;
1457                 }
1458                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1459                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1460                             seq, status);
1461                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1462                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1463                 else {
1464                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1465                             wh, "auth", "unsupported alg %d", algo);
1466                         vap->iv_stats.is_rx_auth_unsupported++;
1467                         return;
1468                 }
1469                 break;
1470         }
1471
1472         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1473         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1474                 uint16_t capinfo, associd;
1475                 uint16_t status;
1476
1477                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1478                         vap->iv_stats.is_rx_mgtdiscard++;
1479                         return;
1480                 }
1481
1482                 /*
1483                  * asresp frame format
1484                  *      [2] capability information
1485                  *      [2] status
1486                  *      [2] association ID
1487                  *      [tlv] supported rates
1488                  *      [tlv] extended supported rates
1489                  *      [tlv] WME
1490                  *      [tlv] HT capabilities
1491                  *      [tlv] HT info
1492                  */
1493                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1494                 ni = vap->iv_bss;
1495                 capinfo = le16toh(*(uint16_t *)frm);
1496                 frm += 2;
1497                 status = le16toh(*(uint16_t *)frm);
1498                 frm += 2;
1499                 if (status != 0) {
1500                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1501                             wh->i_addr2, "%sassoc failed (reason %d)",
1502                             ISREASSOC(subtype) ?  "re" : "", status);
1503                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1504                         return;
1505                 }
1506                 associd = le16toh(*(uint16_t *)frm);
1507                 frm += 2;
1508
1509                 rates = xrates = wme = htcap = htinfo = NULL;
1510                 while (efrm - frm > 1) {
1511                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1512                         switch (*frm) {
1513                         case IEEE80211_ELEMID_RATES:
1514                                 rates = frm;
1515                                 break;
1516                         case IEEE80211_ELEMID_XRATES:
1517                                 xrates = frm;
1518                                 break;
1519                         case IEEE80211_ELEMID_HTCAP:
1520                                 htcap = frm;
1521                                 break;
1522                         case IEEE80211_ELEMID_HTINFO:
1523                                 htinfo = frm;
1524                                 break;
1525                         case IEEE80211_ELEMID_VENDOR:
1526                                 if (iswmeoui(frm))
1527                                         wme = frm;
1528                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1529                                         /*
1530                                          * Accept pre-draft HT ie's if the
1531                                          * standard ones have not been seen.
1532                                          */
1533                                         if (ishtcapoui(frm)) {
1534                                                 if (htcap == NULL)
1535                                                         htcap = frm;
1536                                         } else if (ishtinfooui(frm)) {
1537                                                 if (htinfo == NULL)
1538                                                         htcap = frm;
1539                                         }
1540                                 }
1541                                 /* XXX Atheros OUI support */
1542                                 break;
1543                         }
1544                         frm += frm[1] + 2;
1545                 }
1546
1547                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1548                 if (xrates != NULL)
1549                         IEEE80211_VERIFY_ELEMENT(xrates,
1550                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1551                 rate = ieee80211_setup_rates(ni, rates, xrates,
1552                                 IEEE80211_F_JOIN |
1553                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1554                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1555                 if (rate & IEEE80211_RATE_BASIC) {
1556                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1557                             wh->i_addr2,
1558                             "%sassoc failed (rate set mismatch)",
1559                             ISREASSOC(subtype) ?  "re" : "");
1560                         vap->iv_stats.is_rx_assoc_norate++;
1561                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1562                             IEEE80211_SCAN_FAIL_STATUS);
1563                         return;
1564                 }
1565
1566                 ni->ni_capinfo = capinfo;
1567                 ni->ni_associd = associd;
1568                 if (ni->ni_jointime == 0)
1569                         ni->ni_jointime = time_second;
1570                 if (wme != NULL &&
1571                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1572                         ni->ni_flags |= IEEE80211_NODE_QOS;
1573                         ieee80211_wme_updateparams(vap);
1574                 } else
1575                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1576                 /*
1577                  * Setup HT state according to the negotiation.
1578                  *
1579                  * NB: shouldn't need to check if HT use is enabled but some
1580                  *     ap's send back HT ie's even when we don't indicate we
1581                  *     are HT capable in our AssocReq.
1582                  */
1583                 if (htcap != NULL && htinfo != NULL &&
1584                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1585                         ieee80211_ht_node_init(ni);
1586                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1587                         ieee80211_setup_htrates(ni, htcap,
1588                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1589                         ieee80211_setup_basic_htrates(ni, htinfo);
1590                         ieee80211_node_setuptxparms(ni);
1591                 } else {
1592 #ifdef IEEE80211_SUPPORT_SUPERG
1593                         if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1594                                 ieee80211_ff_node_init(ni);
1595 #endif
1596                 }
1597                 /*
1598                  * Configure state now that we are associated.
1599                  *
1600                  * XXX may need different/additional driver callbacks?
1601                  */
1602                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1603                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1604                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1605                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1606                 } else {
1607                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1608                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1609                 }
1610                 ieee80211_set_shortslottime(ic,
1611                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1612                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1613                 /*
1614                  * Honor ERP protection.
1615                  *
1616                  * NB: ni_erp should zero for non-11g operation.
1617                  */
1618                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1619                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1620                         ic->ic_flags |= IEEE80211_F_USEPROT;
1621                 else
1622                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1623                 IEEE80211_NOTE_MAC(vap,
1624                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1625                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1626                     ISREASSOC(subtype) ? "re" : "",
1627                     IEEE80211_NODE_AID(ni),
1628                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1629                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1630                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1631                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1632                     ni->ni_flags & IEEE80211_NODE_HT ?
1633                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1634                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1635                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1636                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1637                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1638                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1639                         ", fast-frames" : "",
1640                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1641                         ", turbo" : ""
1642                 );
1643                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1644                 break;
1645         }
1646
1647         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1648                 uint16_t reason;
1649
1650                 if (vap->iv_state == IEEE80211_S_SCAN) {
1651                         vap->iv_stats.is_rx_mgtdiscard++;
1652                         return;
1653                 }
1654                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1655                         /* NB: can happen when in promiscuous mode */
1656                         vap->iv_stats.is_rx_mgtdiscard++;
1657                         break;
1658                 }
1659
1660                 /*
1661                  * deauth frame format
1662                  *      [2] reason
1663                  */
1664                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1665                 reason = le16toh(*(uint16_t *)frm);
1666
1667                 vap->iv_stats.is_rx_deauth++;
1668                 vap->iv_stats.is_rx_deauth_code = reason;
1669                 IEEE80211_NODE_STAT(ni, rx_deauth);
1670
1671                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1672                     "recv deauthenticate (reason %d)", reason);
1673                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1674                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1675                 break;
1676         }
1677
1678         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1679                 uint16_t reason;
1680
1681                 if (vap->iv_state != IEEE80211_S_RUN &&
1682                     vap->iv_state != IEEE80211_S_ASSOC &&
1683                     vap->iv_state != IEEE80211_S_AUTH) {
1684                         vap->iv_stats.is_rx_mgtdiscard++;
1685                         return;
1686                 }
1687                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1688                         /* NB: can happen when in promiscuous mode */
1689                         vap->iv_stats.is_rx_mgtdiscard++;
1690                         break;
1691                 }
1692
1693                 /*
1694                  * disassoc frame format
1695                  *      [2] reason
1696                  */
1697                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1698                 reason = le16toh(*(uint16_t *)frm);
1699
1700                 vap->iv_stats.is_rx_disassoc++;
1701                 vap->iv_stats.is_rx_disassoc_code = reason;
1702                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1703
1704                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1705                     "recv disassociate (reason %d)", reason);
1706                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1707                 break;
1708         }
1709
1710         case IEEE80211_FC0_SUBTYPE_ACTION:
1711                 if (vap->iv_state == IEEE80211_S_RUN) {
1712                         if (ieee80211_parse_action(ni, m0) == 0)
1713                                 ic->ic_recv_action(ni, wh, frm, efrm);
1714                 } else
1715                         vap->iv_stats.is_rx_mgtdiscard++;
1716                 break;
1717
1718         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1719         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1720         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1721                 vap->iv_stats.is_rx_mgtdiscard++;
1722                 return;
1723         default:
1724                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1725                      wh, "mgt", "subtype 0x%x not handled", subtype);
1726                 vap->iv_stats.is_rx_badsubtype++;
1727                 break;
1728         }
1729 #undef ISREASSOC
1730 #undef ISPROBE
1731 }
1732
1733 static void
1734 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
1735 {
1736 }