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/ethernet.h>
  54
  55 #include <net/bpf.h>
  56
  57 #include <net80211/ieee80211_var.h>
  58 #include <net80211/ieee80211_sta.h>
  59 #include <net80211/ieee80211_input.h>
  60 #ifdef IEEE80211_SUPPORT_SUPERG
  61 #include <net80211/ieee80211_superg.h>
  62 #endif
  63
  64 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  65
  66 static  void sta_vattach(struct ieee80211vap *);
  67 static  void sta_beacon_miss(struct ieee80211vap *);
  68 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  69 static  int sta_input(struct ieee80211_node *, struct mbuf *, int, int);
  70 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  71             int subtype, int rssi, int nf);
  72 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  73
  74 void
  75 ieee80211_sta_attach(struct ieee80211com *ic)
  76 {
  77         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
  78 }
  79
  80 void
  81 ieee80211_sta_detach(struct ieee80211com *ic)
  82 {
  83 }
  84
  85 static void
  86 sta_vdetach(struct ieee80211vap *vap)
  87 {
  88 }
  89
  90 static void
  91 sta_vattach(struct ieee80211vap *vap)
  92 {
  93         vap->iv_newstate = sta_newstate;
  94         vap->iv_input = sta_input;
  95         vap->iv_recv_mgmt = sta_recv_mgmt;
  96         vap->iv_recv_ctl = sta_recv_ctl;
  97         vap->iv_opdetach = sta_vdetach;
  98         vap->iv_bmiss = sta_beacon_miss;
  99 }
 100
 101 /*
 102  * Handle a beacon miss event.  The common code filters out
 103  * spurious events that can happen when scanning and/or before
 104  * reaching RUN state.
 105  */
 106 static void
 107 sta_beacon_miss(struct ieee80211vap *vap)
 108 {
 109         struct ieee80211com *ic = vap->iv_ic;
 110
 111         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
 112         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 113             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
 114
 115         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
 116             "beacon miss, mode %s state %s\n",
 117             ieee80211_opmode_name[vap->iv_opmode],
 118             ieee80211_state_name[vap->iv_state]);
 119
 120         if (vap->iv_state == IEEE80211_S_CSA) {
 121                 /*
 122                  * A Channel Switch is pending; assume we missed the
 123                  * beacon that would've completed the process and just
 124                  * force the switch.  If we made a mistake we'll not
 125                  * find the AP on the new channel and fall back to a
 126                  * normal scan.
 127                  */
 128                 ieee80211_csa_completeswitch(ic);
 129                 return;
 130         }
 131         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
 132                 /*
 133                  * Send a directed probe req before falling back to a
 134                  * scan; if we receive a response ic_bmiss_count will
 135                  * be reset.  Some cards mistakenly report beacon miss
 136                  * so this avoids the expensive scan if the ap is
 137                  * still there.
 138                  */
 139                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
 140                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
 141                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
 142                 return;
 143         }
 144         vap->iv_bmiss_count = 0;
 145         vap->iv_stats.is_beacon_miss++;
 146         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 147 #ifdef IEEE80211_SUPPORT_SUPERG
 148                 struct ieee80211com *ic = vap->iv_ic;
 149
 150                 /*
 151                  * If we receive a beacon miss interrupt when using
 152                  * dynamic turbo, attempt to switch modes before
 153                  * reassociating.
 154                  */
 155                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
 156                         ieee80211_dturbo_switch(vap,
 157                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
 158 #endif
 159                 /*
 160                  * Try to reassociate before scanning for a new ap.
 161                  */
 162                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
 163         } else {
 164                 /*
 165                  * Somebody else is controlling state changes (e.g.
 166                  * a user-mode app) don't do anything that would
 167                  * confuse them; just drop into scan mode so they'll
 168                  * notified of the state change and given control.
 169                  */
 170                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
 171         }
 172 }
 173
 174 /*
 175  * Handle deauth with reason.  We retry only for
 176  * the cases where we might succeed.  Otherwise
 177  * we downgrade the ap and scan.
 178  */
 179 static void
 180 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
 181 {
 182         switch (reason) {
 183         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
 184         case IEEE80211_STATUS_TIMEOUT:
 185         case IEEE80211_REASON_ASSOC_EXPIRE:
 186         case IEEE80211_REASON_NOT_AUTHED:
 187         case IEEE80211_REASON_NOT_ASSOCED:
 188         case IEEE80211_REASON_ASSOC_LEAVE:
 189         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
 190                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
 191                 break;
 192         default:
 193                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
 194                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 195                         ieee80211_check_scan_current(vap);
 196                 break;
 197         }
 198 }
 199
 200 /*
 201  * IEEE80211_M_STA vap state machine handler.
 202  * This routine handles the main states in the 802.11 protocol.
 203  */
 204 static int
 205 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 206 {
 207         struct ieee80211com *ic = vap->iv_ic;
 208         struct ieee80211_node *ni;
 209         enum ieee80211_state ostate;
 210
 211         IEEE80211_LOCK_ASSERT(ic);
 212
 213         ostate = vap->iv_state;
 214         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 215             __func__, ieee80211_state_name[ostate],
 216             ieee80211_state_name[nstate], arg);
 217         vap->iv_state = nstate;                 /* state transition */
 218         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 219         if (ostate != IEEE80211_S_SCAN)
 220                 ieee80211_cancel_scan(vap);     /* background scan */
 221         ni = vap->iv_bss;                       /* NB: no reference held */
 222         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
 223                 callout_stop(&vap->iv_swbmiss);
 224         switch (nstate) {
 225         case IEEE80211_S_INIT:
 226                 switch (ostate) {
 227                 case IEEE80211_S_SLEEP:
 228                         /* XXX wakeup */
 229                 case IEEE80211_S_RUN:
 230                         IEEE80211_SEND_MGMT(ni,
 231                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 232                             IEEE80211_REASON_ASSOC_LEAVE);
 233                         ieee80211_sta_leave(ni);
 234                         break;
 235                 case IEEE80211_S_ASSOC:
 236                         IEEE80211_SEND_MGMT(ni,
 237                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 238                             IEEE80211_REASON_AUTH_LEAVE);
 239                         break;
 240                 case IEEE80211_S_SCAN:
 241                         ieee80211_cancel_scan(vap);
 242                         break;
 243                 default:
 244                         goto invalid;
 245                 }
 246                 if (ostate != IEEE80211_S_INIT) {
 247                         /* NB: optimize INIT -> INIT case */
 248                         ieee80211_reset_bss(vap);
 249                 }
 250                 if (vap->iv_auth->ia_detach != NULL)
 251                         vap->iv_auth->ia_detach(vap);
 252                 break;
 253         case IEEE80211_S_SCAN:
 254                 switch (ostate) {
 255                 case IEEE80211_S_INIT:
 256                         /*
 257                          * Initiate a scan.  We can come here as a result
 258                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 259                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 260                          * and the scan request parameters will be present
 261                          * in iv_scanreq.  Otherwise we do the default.
 262                          */
 263                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 264                                 ieee80211_check_scan(vap,
 265                                     vap->iv_scanreq_flags,
 266                                     vap->iv_scanreq_duration,
 267                                     vap->iv_scanreq_mindwell,
 268                                     vap->iv_scanreq_maxdwell,
 269                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 270                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 271                         } else
 272                                 ieee80211_check_scan_current(vap);
 273                         break;
 274                 case IEEE80211_S_SCAN:
 275                 case IEEE80211_S_AUTH:
 276                 case IEEE80211_S_ASSOC:
 277                         /*
 278                          * These can happen either because of a timeout
 279                          * on an assoc/auth response or because of a
 280                          * change in state that requires a reset.  For
 281                          * the former we're called with a non-zero arg
 282                          * that is the cause for the failure; pass this
 283                          * to the scan code so it can update state.
 284                          * Otherwise trigger a new scan unless we're in
 285                          * manual roaming mode in which case an application
 286                          * must issue an explicit scan request.
 287                          */
 288                         if (arg != 0)
 289                                 ieee80211_scan_assoc_fail(vap,
 290                                         vap->iv_bss->ni_macaddr, arg);
 291                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 292                                 ieee80211_check_scan_current(vap);
 293                         break;
 294                 case IEEE80211_S_RUN:           /* beacon miss */
 295                         /*
 296                          * Beacon miss.  Notify user space and if not
 297                          * under control of a user application (roaming
 298                          * manual) kick off a scan to re-connect.
 299                          */
 300                         ieee80211_sta_leave(ni);
 301                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 302                                 ieee80211_check_scan_current(vap);
 303                         break;
 304                 default:
 305                         goto invalid;
 306                 }
 307                 break;
 308         case IEEE80211_S_AUTH:
 309                 switch (ostate) {
 310                 case IEEE80211_S_INIT:
 311                 case IEEE80211_S_SCAN:
 312                         IEEE80211_SEND_MGMT(ni,
 313                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 314                         break;
 315                 case IEEE80211_S_AUTH:
 316                 case IEEE80211_S_ASSOC:
 317                         switch (arg & 0xff) {
 318                         case IEEE80211_FC0_SUBTYPE_AUTH:
 319                                 /* ??? */
 320                                 IEEE80211_SEND_MGMT(ni,
 321                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 322                                 break;
 323                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 324                                 sta_authretry(vap, ni, arg>>8);
 325                                 break;
 326                         }
 327                         break;
 328                 case IEEE80211_S_RUN:
 329                         switch (arg & 0xff) {
 330                         case IEEE80211_FC0_SUBTYPE_AUTH:
 331                                 IEEE80211_SEND_MGMT(ni,
 332                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
 333                                 vap->iv_state = ostate; /* stay RUN */
 334                                 break;
 335                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 336                                 ieee80211_sta_leave(ni);
 337                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 338                                         /* try to reauth */
 339                                         IEEE80211_SEND_MGMT(ni,
 340                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
 341                                 }
 342                                 break;
 343                         }
 344                         break;
 345                 default:
 346                         goto invalid;
 347                 }
 348                 break;
 349         case IEEE80211_S_ASSOC:
 350                 switch (ostate) {
 351                 case IEEE80211_S_AUTH:
 352                 case IEEE80211_S_ASSOC:
 353                         IEEE80211_SEND_MGMT(ni,
 354                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 355                         break;
 356                 case IEEE80211_S_SLEEP:         /* cannot happen */
 357                 case IEEE80211_S_RUN:
 358                         ieee80211_sta_leave(ni);
 359                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
 360                                 IEEE80211_SEND_MGMT(ni, arg ?
 361                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
 362                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
 363                         }
 364                         break;
 365                 default:
 366                         goto invalid;
 367                 }
 368                 break;
 369         case IEEE80211_S_RUN:
 370                 if (vap->iv_flags & IEEE80211_F_WPA) {
 371                         /* XXX validate prerequisites */
 372                 }
 373                 switch (ostate) {
 374                 case IEEE80211_S_RUN:
 375                 case IEEE80211_S_CSA:
 376                         break;
 377                 case IEEE80211_S_AUTH:          /* when join is done in fw */
 378                 case IEEE80211_S_ASSOC:
 379 #ifdef IEEE80211_DEBUG
 380                         if (ieee80211_msg_debug(vap)) {
 381                                 ieee80211_note(vap, "%s with %s ssid ",
 382                                     (vap->iv_opmode == IEEE80211_M_STA ?
 383                                     "associated" : "synchronized"),
 384                                     ether_sprintf(ni->ni_bssid));
 385                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 386                                     ni->ni_esslen);
 387                                 /* XXX MCS/HT */
 388                                 printf(" channel %d start %uMb\n",
 389                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 390                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 391                         }
 392 #endif
 393                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
 394                         ieee80211_notify_node_join(ni,
 395                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 396                         break;
 397                 case IEEE80211_S_SLEEP:
 398                         ieee80211_sta_pwrsave(vap, 0);
 399                         break;
 400                 default:
 401                         goto invalid;
 402                 }
 403                 ieee80211_sync_curchan(ic);
 404                 if (ostate != IEEE80211_S_RUN &&
 405                     (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
 406                         /*
 407                          * Start s/w beacon miss timer for devices w/o
 408                          * hardware support.  We fudge a bit here since
 409                          * we're doing this in software.
 410                          */
 411                         vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
 412                                 2 * vap->iv_bmissthreshold * ni->ni_intval);
 413                         vap->iv_swbmiss_count = 0;
 414                         callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
 415                                 ieee80211_swbmiss, vap);
 416                 }
 417                 /*
 418                  * When 802.1x is not in use mark the port authorized
 419                  * at this point so traffic can flow.
 420                  */
 421                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 422                         ieee80211_node_authorize(ni);
 423                 /*
 424                  * Fake association when joining an existing bss.
 425                  */
 426                 if (ic->ic_newassoc != NULL)
 427                         ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
 428                 break;
 429         case IEEE80211_S_CSA:
 430                 if (ostate != IEEE80211_S_RUN)
 431                         goto invalid;
 432                 break;
 433         case IEEE80211_S_SLEEP:
 434                 ieee80211_sta_pwrsave(vap, 0);
 435                 break;
 436         default:
 437         invalid:
 438                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 439                     "%s: unexpected state transition %s -> %s\n", __func__,
 440                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 441                 break;
 442         }
 443         return 0;
 444 }
 445
 446 /*
 447  * Return non-zero if the frame is an echo of a multicast
 448  * frame sent by ourself.  The dir is known to be DSTODS.
 449  */
 450 static __inline int
 451 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 452 {
 453 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
 454 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
 455         const uint8_t *sa;
 456
 457         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 458
 459         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
 460                 return 0;
 461         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
 462         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
 463 #undef WH4
 464 #undef QWH4
 465 }
 466
 467 /*
 468  * Return non-zero if the frame is an echo of a multicast
 469  * frame sent by ourself.  The dir is known to be FROMDS.
 470  */
 471 static __inline int
 472 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
 473 {
 474         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
 475
 476         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 477                 return 0;
 478         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 479 }
 480
 481 /*
 482  * Decide if a received management frame should be
 483  * printed when debugging is enabled.  This filters some
 484  * of the less interesting frames that come frequently
 485  * (e.g. beacons).
 486  */
 487 static __inline int
 488 doprint(struct ieee80211vap *vap, int subtype)
 489 {
 490         switch (subtype) {
 491         case IEEE80211_FC0_SUBTYPE_BEACON:
 492                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 493         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 494                 return 0;
 495         }
 496         return 1;
 497 }
 498
 499 /*
 500  * Process a received frame.  The node associated with the sender
 501  * should be supplied.  If nothing was found in the node table then
 502  * the caller is assumed to supply a reference to iv_bss instead.
 503  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 504  * during AP scanning to select a AP to associate with; it can have
 505  * any units so long as values have consistent units and higher values
 506  * mean ``better signal''.  The receive timestamp is currently not used
 507  * by the 802.11 layer.
 508  */
 509 static int
 510 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 511 {
 512 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 513 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 514         struct ieee80211vap *vap = ni->ni_vap;
 515         struct ieee80211com *ic = ni->ni_ic;
 516         struct ifnet *ifp = vap->iv_ifp;
 517         struct ieee80211_frame *wh;
 518         struct ieee80211_key *key;
 519         struct ether_header *eh;
 520         int hdrspace, need_tap;
 521         uint8_t dir, type, subtype, qos;
 522         uint8_t *bssid;
 523         uint16_t rxseq;
 524
 525         if (m->m_flags & M_AMPDU_MPDU) {
 526                 /*
 527                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 528                  * w/ M_AMPDU_MPDU marked have already passed through
 529                  * here but were received out of order and been held on
 530                  * the reorder queue.  When resubmitted they are marked
 531                  * with the M_AMPDU_MPDU flag and we can bypass most of
 532                  * the normal processing.
 533                  */
 534                 wh = mtod(m, struct ieee80211_frame *);
 535                 type = IEEE80211_FC0_TYPE_DATA;
 536                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 537                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 538                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 539                 goto resubmit_ampdu;
 540         }
 541
 542         KASSERT(ni != NULL, ("null node"));
 543         ni->ni_inact = ni->ni_inact_reload;
 544
 545         need_tap = 1;                   /* mbuf need to be tapped. */
 546         type = -1;                      /* undefined */
 547
 548         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 549                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 550                     ni->ni_macaddr, NULL,
 551                     "too short (1): len %u", m->m_pkthdr.len);
 552                 vap->iv_stats.is_rx_tooshort++;
 553                 goto out;
 554         }
 555         /*
 556          * Bit of a cheat here, we use a pointer for a 3-address
 557          * frame format but don't reference fields past outside
 558          * ieee80211_frame_min w/o first validating the data is
 559          * present.
 560          */
 561         wh = mtod(m, struct ieee80211_frame *);
 562
 563         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 564             IEEE80211_FC0_VERSION_0) {
 565                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 566                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 567                     wh->i_fc[0], wh->i_fc[1]);
 568                 vap->iv_stats.is_rx_badversion++;
 569                 goto err;
 570         }
 571
 572         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 573         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 574         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 575         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 576                 bssid = wh->i_addr2;
 577                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
 578                         /* not interested in */
 579                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 580                             bssid, NULL, "%s", "not to bss");
 581                         vap->iv_stats.is_rx_wrongbss++;
 582                         goto out;
 583                 }
 584                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 585                 ni->ni_noise = nf;
 586                 if (HAS_SEQ(type)) {
 587                         uint8_t tid = ieee80211_gettid(wh);
 588                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 589                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 590                                 ic->ic_wme.wme_hipri_traffic++;
 591                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 592                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 593                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 594                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 595                                 /* duplicate, discard */
 596                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 597                                     bssid, "duplicate",
 598                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 599                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 600                                     ni->ni_rxseqs[tid] >>
 601                                         IEEE80211_SEQ_SEQ_SHIFT,
 602                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 603                                     ni->ni_rxseqs[tid] &
 604                                         IEEE80211_SEQ_FRAG_MASK,
 605                                     tid);
 606                                 vap->iv_stats.is_rx_dup++;
 607                                 IEEE80211_NODE_STAT(ni, rx_dup);
 608                                 goto out;
 609                         }
 610                         ni->ni_rxseqs[tid] = rxseq;
 611                 }
 612         }
 613
 614         switch (type) {
 615         case IEEE80211_FC0_TYPE_DATA:
 616                 hdrspace = ieee80211_hdrspace(ic, wh);
 617                 if (m->m_len < hdrspace &&
 618                     (m = m_pullup(m, hdrspace)) == NULL) {
 619                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 620                             ni->ni_macaddr, NULL,
 621                             "data too short: expecting %u", hdrspace);
 622                         vap->iv_stats.is_rx_tooshort++;
 623                         goto out;               /* XXX */
 624                 }
 625                 /*
 626                  * Handle A-MPDU re-ordering.  If the frame is to be
 627                  * processed directly then ieee80211_ampdu_reorder
 628                  * will return 0; otherwise it has consumed the mbuf
 629                  * and we should do nothing more with it.
 630                  */
 631                 if ((m->m_flags & M_AMPDU) &&
 632                     (dir == IEEE80211_FC1_DIR_FROMDS ||
 633                      dir == IEEE80211_FC1_DIR_DSTODS) &&
 634                     ieee80211_ampdu_reorder(ni, m) != 0) {
 635                         m = NULL;
 636                         goto out;
 637                 }
 638         resubmit_ampdu:
 639                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
 640                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 641                             isfromds_mcastecho(vap, wh)) {
 642                                 /*
 643                                  * In IEEE802.11 network, multicast
 644                                  * packets sent from "me" are broadcast
 645                                  * from the AP; silently discard for
 646                                  * SIMPLEX interface.
 647                                  */
 648                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 649                                     wh, "data", "%s", "multicast echo");
 650                                 vap->iv_stats.is_rx_mcastecho++;
 651                                 goto out;
 652                         }
 653                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
 654                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 655                                 /*
 656                                  * DWDS sta's must drop 3-address mcast frames
 657                                  * as they will be sent separately as a 4-addr
 658                                  * frame.  Accepting the 3-addr frame will
 659                                  * confuse the bridge into thinking the sending
 660                                  * sta is located at the end of WDS link.
 661                                  */
 662                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 663                                     "3-address data", "%s", "DWDS enabled");
 664                                 vap->iv_stats.is_rx_mcastecho++;
 665                                 goto out;
 666                         }
 667                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
 668                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
 669                                 IEEE80211_DISCARD(vap,
 670                                     IEEE80211_MSG_INPUT, wh, "4-address data",
 671                                     "%s", "DWDS not enabled");
 672                                 vap->iv_stats.is_rx_wrongdir++;
 673                                 goto out;
 674                         }
 675                         if ((ifp->if_flags & IFF_SIMPLEX) &&
 676                             isdstods_mcastecho(vap, wh)) {
 677                                 /*
 678                                  * In IEEE802.11 network, multicast
 679                                  * packets sent from "me" are broadcast
 680                                  * from the AP; silently discard for
 681                                  * SIMPLEX interface.
 682                                  */
 683                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 684                                     "4-address data", "%s", "multicast echo");
 685                                 vap->iv_stats.is_rx_mcastecho++;
 686                                 goto out;
 687                         }
 688                 } else {
 689                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
 690                             "data", "incorrect dir 0x%x", dir);
 691                         vap->iv_stats.is_rx_wrongdir++;
 692                         goto out;
 693                 }
 694
 695                 /*
 696                  * Handle privacy requirements.  Note that we
 697                  * must not be preempted from here until after
 698                  * we (potentially) call ieee80211_crypto_demic;
 699                  * otherwise we may violate assumptions in the
 700                  * crypto cipher modules used to do delayed update
 701                  * of replay sequence numbers.
 702                  */
 703                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 704                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 705                                 /*
 706                                  * Discard encrypted frames when privacy is off.
 707                                  */
 708                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 709                                     wh, "WEP", "%s", "PRIVACY off");
 710                                 vap->iv_stats.is_rx_noprivacy++;
 711                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 712                                 goto out;
 713                         }
 714                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 715                         if (key == NULL) {
 716                                 /* NB: stats+msgs handled in crypto_decap */
 717                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 718                                 goto out;
 719                         }
 720                         wh = mtod(m, struct ieee80211_frame *);
 721                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 722                 } else {
 723                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 724                         key = NULL;
 725                 }
 726
 727                 /*
 728                  * Save QoS bits for use below--before we strip the header.
 729                  */
 730                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 731                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 732                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 733                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 734                 } else
 735                         qos = 0;
 736
 737                 /*
 738                  * Next up, any fragmentation.
 739                  */
 740                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 741                         m = ieee80211_defrag(ni, m, hdrspace);
 742                         if (m == NULL) {
 743                                 /* Fragment dropped or frame not complete yet */
 744                                 goto out;
 745                         }
 746                 }
 747                 wh = NULL;              /* no longer valid, catch any uses */
 748
 749                 /*
 750                  * Next strip any MSDU crypto bits.
 751                  */
 752                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 753                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 754                             ni->ni_macaddr, "data", "%s", "demic error");
 755                         vap->iv_stats.is_rx_demicfail++;
 756                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 757                         goto out;
 758                 }
 759
 760                 /* copy to listener after decrypt */
 761                 if (ieee80211_radiotap_active_vap(vap))
 762                         ieee80211_radiotap_tx(vap, m);
 763                 need_tap = 0;
 764
 765                 /*
 766                  * Finally, strip the 802.11 header.
 767                  */
 768                 m = ieee80211_decap(vap, m, hdrspace);
 769                 if (m == NULL) {
 770                         /* XXX mask bit to check for both */
 771                         /* don't count Null data frames as errors */
 772                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 773                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 774                                 goto out;
 775                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 776                             ni->ni_macaddr, "data", "%s", "decap error");
 777                         vap->iv_stats.is_rx_decap++;
 778                         IEEE80211_NODE_STAT(ni, rx_decap);
 779                         goto err;
 780                 }
 781                 eh = mtod(m, struct ether_header *);
 782                 if (!ieee80211_node_is_authorized(ni)) {
 783                         /*
 784                          * Deny any non-PAE frames received prior to
 785                          * authorization.  For open/shared-key
 786                          * authentication the port is mark authorized
 787                          * after authentication completes.  For 802.1x
 788                          * the port is not marked authorized by the
 789                          * authenticator until the handshake has completed.
 790                          */
 791                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 792                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 793                                     eh->ether_shost, "data",
 794                                     "unauthorized port: ether type 0x%x len %u",
 795                                     eh->ether_type, m->m_pkthdr.len);
 796                                 vap->iv_stats.is_rx_unauth++;
 797                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 798                                 goto err;
 799                         }
 800                 } else {
 801                         /*
 802                          * When denying unencrypted frames, discard
 803                          * any non-PAE frames received without encryption.
 804                          */
 805                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 806                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 807                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 808                                 /*
 809                                  * Drop unencrypted frames.
 810                                  */
 811                                 vap->iv_stats.is_rx_unencrypted++;
 812                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 813                                 goto out;
 814                         }
 815                 }
 816                 /* XXX require HT? */
 817                 if (qos & IEEE80211_QOS_AMSDU) {
 818                         m = ieee80211_decap_amsdu(ni, m);
 819                         if (m == NULL)
 820                                 return IEEE80211_FC0_TYPE_DATA;
 821                 } else {
 822 #ifdef IEEE80211_SUPPORT_SUPERG
 823                         m = ieee80211_decap_fastframe(vap, ni, m);
 824                         if (m == NULL)
 825                                 return IEEE80211_FC0_TYPE_DATA;
 826 #endif
 827                 }
 828                 ieee80211_deliver_data(vap, ni, m);
 829                 return IEEE80211_FC0_TYPE_DATA;
 830
 831         case IEEE80211_FC0_TYPE_MGT:
 832                 vap->iv_stats.is_rx_mgmt++;
 833                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 834                 if (dir != IEEE80211_FC1_DIR_NODS) {
 835                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 836                             wh, "data", "incorrect dir 0x%x", dir);
 837                         vap->iv_stats.is_rx_wrongdir++;
 838                         goto err;
 839                 }
 840                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 841                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 842                             ni->ni_macaddr, "mgt", "too short: len %u",
 843                             m->m_pkthdr.len);
 844                         vap->iv_stats.is_rx_tooshort++;
 845                         goto out;
 846                 }
 847 #ifdef IEEE80211_DEBUG
 848                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 849                     ieee80211_msg_dumppkts(vap)) {
 850                         if_printf(ifp, "received %s from %s rssi %d\n",
 851                             ieee80211_mgt_subtype_name[subtype >>
 852                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 853                             ether_sprintf(wh->i_addr2), rssi);
 854                 }
 855 #endif
 856                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 857                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 858                                 /*
 859                                  * Only shared key auth frames with a challenge
 860                                  * should be encrypted, discard all others.
 861                                  */
 862                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 863                                     wh, ieee80211_mgt_subtype_name[subtype >>
 864                                         IEEE80211_FC0_SUBTYPE_SHIFT],
 865                                     "%s", "WEP set but not permitted");
 866                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 867                                 goto out;
 868                         }
 869                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 870                                 /*
 871                                  * Discard encrypted frames when privacy is off.
 872                                  */
 873                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 874                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
 875                                 vap->iv_stats.is_rx_noprivacy++;
 876                                 goto out;
 877                         }
 878                         hdrspace = ieee80211_hdrspace(ic, wh);
 879                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 880                         if (key == NULL) {
 881                                 /* NB: stats+msgs handled in crypto_decap */
 882                                 goto out;
 883                         }
 884                         wh = mtod(m, struct ieee80211_frame *);
 885                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 886                 }
 887                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 888                 goto out;
 889
 890         case IEEE80211_FC0_TYPE_CTL:
 891                 vap->iv_stats.is_rx_ctl++;
 892                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 893                 vap->iv_recv_ctl(ni, m, subtype);
 894                 goto out;
 895
 896         default:
 897                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 898                     wh, NULL, "bad frame type 0x%x", type);
 899                 /* should not come here */
 900                 break;
 901         }
 902 err:
 903         ifp->if_ierrors++;
 904 out:
 905         if (m != NULL) {
 906                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 907                         ieee80211_radiotap_rx(vap, m);
 908                 m_freem(m);
 909         }
 910         return type;
 911 #undef SEQ_LEQ
 912 }
 913
 914 static void
 915 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 916     int rssi, int nf, uint16_t seq, uint16_t status)
 917 {
 918         struct ieee80211vap *vap = ni->ni_vap;
 919
 920         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 921                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 922                     ni->ni_macaddr, "open auth",
 923                     "bad sta auth mode %u", ni->ni_authmode);
 924                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 925                 return;
 926         }
 927         if (vap->iv_state != IEEE80211_S_AUTH ||
 928             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
 929                 vap->iv_stats.is_rx_bad_auth++;
 930                 return;
 931         }
 932         if (status != 0) {
 933                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 934                     ni, "open auth failed (reason %d)", status);
 935                 vap->iv_stats.is_rx_auth_fail++;
 936                 vap->iv_stats.is_rx_authfail_code = status;
 937                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 938                     IEEE80211_SCAN_FAIL_STATUS);
 939         } else
 940                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 941 }
 942
 943 static void
 944 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 945     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 946     uint16_t seq, uint16_t status)
 947 {
 948         struct ieee80211vap *vap = ni->ni_vap;
 949         uint8_t *challenge;
 950         int estatus;
 951
 952         /*
 953          * NB: this can happen as we allow pre-shared key
 954          * authentication to be enabled w/o wep being turned
 955          * on so that configuration of these can be done
 956          * in any order.  It may be better to enforce the
 957          * ordering in which case this check would just be
 958          * for sanity/consistency.
 959          */
 960         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 961                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 962                     ni->ni_macaddr, "shared key auth",
 963                     "%s", " PRIVACY is disabled");
 964                 estatus = IEEE80211_STATUS_ALG;
 965                 goto bad;
 966         }
 967         /*
 968          * Pre-shared key authentication is evil; accept
 969          * it only if explicitly configured (it is supported
 970          * mainly for compatibility with clients like OS X).
 971          */
 972         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
 973             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
 974                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 975                     ni->ni_macaddr, "shared key auth",
 976                     "bad sta auth mode %u", ni->ni_authmode);
 977                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
 978                 estatus = IEEE80211_STATUS_ALG;
 979                 goto bad;
 980         }
 981
 982         challenge = NULL;
 983         if (frm + 1 < efrm) {
 984                 if ((frm[1] + 2) > (efrm - frm)) {
 985                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 986                             ni->ni_macaddr, "shared key auth",
 987                             "ie %d/%d too long",
 988                             frm[0], (frm[1] + 2) - (efrm - frm));
 989                         vap->iv_stats.is_rx_bad_auth++;
 990                         estatus = IEEE80211_STATUS_CHALLENGE;
 991                         goto bad;
 992                 }
 993                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
 994                         challenge = frm;
 995                 frm += frm[1] + 2;
 996         }
 997         switch (seq) {
 998         case IEEE80211_AUTH_SHARED_CHALLENGE:
 999         case IEEE80211_AUTH_SHARED_RESPONSE:
1000                 if (challenge == NULL) {
1001                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1002                             ni->ni_macaddr, "shared key auth",
1003                             "%s", "no challenge");
1004                         vap->iv_stats.is_rx_bad_auth++;
1005                         estatus = IEEE80211_STATUS_CHALLENGE;
1006                         goto bad;
1007                 }
1008                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1009                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1010                             ni->ni_macaddr, "shared key auth",
1011                             "bad challenge len %d", challenge[1]);
1012                         vap->iv_stats.is_rx_bad_auth++;
1013                         estatus = IEEE80211_STATUS_CHALLENGE;
1014                         goto bad;
1015                 }
1016         default:
1017                 break;
1018         }
1019         if (vap->iv_state != IEEE80211_S_AUTH)
1020                 return;
1021         switch (seq) {
1022         case IEEE80211_AUTH_SHARED_PASS:
1023                 if (ni->ni_challenge != NULL) {
1024                         free(ni->ni_challenge, M_80211_NODE);
1025                         ni->ni_challenge = NULL;
1026                 }
1027                 if (status != 0) {
1028                         IEEE80211_NOTE_FRAME(vap,
1029                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
1030                             "shared key auth failed (reason %d)", status);
1031                         vap->iv_stats.is_rx_auth_fail++;
1032                         vap->iv_stats.is_rx_authfail_code = status;
1033                         return;
1034                 }
1035                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1036                 break;
1037         case IEEE80211_AUTH_SHARED_CHALLENGE:
1038                 if (!ieee80211_alloc_challenge(ni))
1039                         return;
1040                 /* XXX could optimize by passing recvd challenge */
1041                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
1042                 IEEE80211_SEND_MGMT(ni,
1043                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1044                 break;
1045         default:
1046                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
1047                     wh, "shared key auth", "bad seq %d", seq);
1048                 vap->iv_stats.is_rx_bad_auth++;
1049                 return;
1050         }
1051         return;
1052 bad:
1053         /*
1054          * Kick the state machine.  This short-circuits
1055          * using the mgt frame timeout to trigger the
1056          * state transition.
1057          */
1058         if (vap->iv_state == IEEE80211_S_AUTH)
1059                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
1060                     IEEE80211_SCAN_FAIL_STATUS);
1061 }
1062
1063 static int
1064 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
1065         const struct ieee80211_frame *wh)
1066 {
1067 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
1068         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
1069         u_int len = frm[1], qosinfo;
1070         int i;
1071
1072         if (len < sizeof(struct ieee80211_wme_param)-2) {
1073                 IEEE80211_DISCARD_IE(vap,
1074                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
1075                     wh, "WME", "too short, len %u", len);
1076                 return -1;
1077         }
1078         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
1079         qosinfo &= WME_QOSINFO_COUNT;
1080         /* XXX do proper check for wraparound */
1081         if (qosinfo == wme->wme_wmeChanParams.cap_info)
1082                 return 0;
1083         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
1084         for (i = 0; i < WME_NUM_AC; i++) {
1085                 struct wmeParams *wmep =
1086                         &wme->wme_wmeChanParams.cap_wmeParams[i];
1087                 /* NB: ACI not used */
1088                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
1089                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
1090                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
1091                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
1092                 wmep->wmep_txopLimit = LE_READ_2(frm+2);
1093                 frm += 4;
1094         }
1095         wme->wme_wmeChanParams.cap_info = qosinfo;
1096         return 1;
1097 #undef MS
1098 }
1099
1100 /*
1101  * Process 11h Channel Switch Announcement (CSA) ie.  If this
1102  * is the first CSA then initiate the switch.  Otherwise we
1103  * track state and trigger completion and/or cancel of the switch.
1104  * XXX should be public for IBSS use
1105  */
1106 static void
1107 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
1108         const struct ieee80211_frame *wh)
1109 {
1110         struct ieee80211com *ic = vap->iv_ic;
1111         const struct ieee80211_csa_ie *csa =
1112             (const struct ieee80211_csa_ie *) frm;
1113
1114         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
1115             ("state %s", ieee80211_state_name[vap->iv_state]));
1116
1117         if (csa->csa_mode > 1) {
1118                 IEEE80211_DISCARD_IE(vap,
1119                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1120                     wh, "CSA", "invalid mode %u", csa->csa_mode);
1121                 return;
1122         }
1123         IEEE80211_LOCK(ic);
1124         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
1125                 /*
1126                  * Convert the channel number to a channel reference.  We
1127                  * try first to preserve turbo attribute of the current
1128                  * channel then fallback.  Note this will not work if the
1129                  * CSA specifies a channel that requires a band switch (e.g.
1130                  * 11a => 11g).  This is intentional as 11h is defined only
1131                  * for 5GHz/11a and because the switch does not involve a
1132                  * reassociation, protocol state (capabilities, negotated
1133                  * rates, etc) may/will be wrong.
1134                  */
1135                 struct ieee80211_channel *c =
1136                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
1137                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
1138                 if (c == NULL) {
1139                         c = ieee80211_find_channel_byieee(ic,
1140                             csa->csa_newchan,
1141                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
1142                         if (c == NULL) {
1143                                 IEEE80211_DISCARD_IE(vap,
1144                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1145                                     wh, "CSA", "invalid channel %u",
1146                                     csa->csa_newchan);
1147                                 goto done;
1148                         }
1149                 }
1150 #if IEEE80211_CSA_COUNT_MIN > 0
1151                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
1152                         /*
1153                          * Require at least IEEE80211_CSA_COUNT_MIN count to
1154                          * reduce the risk of being redirected by a fabricated
1155                          * CSA.  If a valid CSA is dropped we'll still get a
1156                          * beacon miss when the AP leaves the channel so we'll
1157                          * eventually follow to the new channel.
1158                          *
1159                          * NOTE: this violates the 11h spec that states that
1160                          * count may be any value and if 0 then a switch
1161                          * should happen asap.
1162                          */
1163                         IEEE80211_DISCARD_IE(vap,
1164                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
1165                             wh, "CSA", "count %u too small, must be >= %u",
1166                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
1167                         goto done;
1168                 }
1169 #endif
1170                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
1171         } else {
1172                 /*
1173                  * Validate this ie against the initial CSA.  We require
1174                  * mode and channel not change and the count must be
1175                  * monotonically decreasing.  This may be pointless and
1176                  * canceling the switch as a result may be too paranoid but
1177                  * in the worst case if we drop out of CSA because of this
1178                  * and the AP does move then we'll just end up taking a
1179                  * beacon miss and scan to find the AP.
1180                  *
1181                  * XXX may want <= on count as we also process ProbeResp
1182                  * frames and those may come in w/ the same count as the
1183                  * previous beacon; but doing so leaves us open to a stuck
1184                  * count until we add a dead-man timer
1185                  */
1186                 if (!(csa->csa_count < ic->ic_csa_count &&
1187                       csa->csa_mode == ic->ic_csa_mode &&
1188                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
1189                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
1190                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
1191                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
1192                             ic->ic_csa_newchan, ic->ic_csa_count,
1193                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
1194                         ieee80211_csa_cancelswitch(ic);
1195                 } else {
1196                         if (csa->csa_count <= 1)
1197                                 ieee80211_csa_completeswitch(ic);
1198                         else
1199                                 ic->ic_csa_count = csa->csa_count;
1200                 }
1201         }
1202 done:
1203         IEEE80211_UNLOCK(ic);
1204 }
1205
1206 /*
1207  * Return non-zero if a background scan may be continued:
1208  * o bg scan is active
1209  * o no channel switch is pending
1210  * o there has not been any traffic recently
1211  *
1212  * Note we do not check if there is an administrative enable;
1213  * this is only done to start the scan.  We assume that any
1214  * change in state will be accompanied by a request to cancel
1215  * active scans which will otherwise cause this test to fail.
1216  */
1217 static __inline int
1218 contbgscan(struct ieee80211vap *vap)
1219 {
1220         struct ieee80211com *ic = vap->iv_ic;
1221
1222         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
1223             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1224             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
1225             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1226 }
1227
1228 /*
1229  * Return non-zero if a backgrond scan may be started:
1230  * o bg scanning is administratively enabled
1231  * o no channel switch is pending
1232  * o we are not boosted on a dynamic turbo channel
1233  * o there has not been a scan recently
1234  * o there has not been any traffic recently
1235  */
1236 static __inline int
1237 startbgscan(struct ieee80211vap *vap)
1238 {
1239         struct ieee80211com *ic = vap->iv_ic;
1240
1241         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
1242             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
1243 #ifdef IEEE80211_SUPPORT_SUPERG
1244             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
1245 #endif
1246             time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
1247             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
1248 }
1249
1250 static void
1251 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1252         int subtype, int rssi, int nf)
1253 {
1254 #define ISPROBE(_st)    ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1255 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
1256         struct ieee80211vap *vap = ni->ni_vap;
1257         struct ieee80211com *ic = ni->ni_ic;
1258         struct ieee80211_frame *wh;
1259         uint8_t *frm, *efrm;
1260         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
1261         uint8_t rate;
1262
1263         wh = mtod(m0, struct ieee80211_frame *);
1264         frm = (uint8_t *)&wh[1];
1265         efrm = mtod(m0, uint8_t *) + m0->m_len;
1266         switch (subtype) {
1267         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1268         case IEEE80211_FC0_SUBTYPE_BEACON: {
1269                 struct ieee80211_scanparams scan;
1270                 /*
1271                  * We process beacon/probe response frames:
1272                  *    o when scanning, or
1273                  *    o station mode when associated (to collect state
1274                  *      updates such as 802.11g slot time)
1275                  * Frames otherwise received are discarded.
1276                  */
1277                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
1278                         vap->iv_stats.is_rx_mgtdiscard++;
1279                         return;
1280                 }
1281                 /* XXX probe response in sta mode when !scanning? */
1282                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
1283                         return;
1284                 /*
1285                  * Count frame now that we know it's to be processed.
1286                  */
1287                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1288                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1289                         IEEE80211_NODE_STAT(ni, rx_beacons);
1290                 } else
1291                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1292                 /*
1293                  * When operating in station mode, check for state updates.
1294                  * Be careful to ignore beacons received while doing a
1295                  * background scan.  We consider only 11g/WMM stuff right now.
1296                  */
1297                 if (ni->ni_associd != 0 &&
1298                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
1299                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
1300                         /* record tsf of last beacon */
1301                         memcpy(ni->ni_tstamp.data, scan.tstamp,
1302                                 sizeof(ni->ni_tstamp));
1303                         /* count beacon frame for s/w bmiss handling */
1304                         vap->iv_swbmiss_count++;
1305                         vap->iv_bmiss_count = 0;
1306                         if (ni->ni_erp != scan.erp) {
1307                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1308                                     wh->i_addr2,
1309                                     "erp change: was 0x%x, now 0x%x",
1310                                     ni->ni_erp, scan.erp);
1311                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1312                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1313                                         ic->ic_flags |= IEEE80211_F_USEPROT;
1314                                 else
1315                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1316                                 ni->ni_erp = scan.erp;
1317                                 /* XXX statistic */
1318                                 /* XXX driver notification */
1319                         }
1320                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
1321                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1322                                     wh->i_addr2,
1323                                     "capabilities change: was 0x%x, now 0x%x",
1324                                     ni->ni_capinfo, scan.capinfo);
1325                                 /*
1326                                  * NB: we assume short preamble doesn't
1327                                  *     change dynamically
1328                                  */
1329                                 ieee80211_set_shortslottime(ic,
1330                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
1331                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1332                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
1333                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
1334                                 /* XXX statistic */
1335                         }
1336                         if (scan.wme != NULL &&
1337                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
1338                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
1339                                 ieee80211_wme_updateparams(vap);
1340 #ifdef IEEE80211_SUPPORT_SUPERG
1341                         if (scan.ath != NULL)
1342                                 ieee80211_parse_athparams(ni, scan.ath, wh);
1343 #endif
1344                         if (scan.htcap != NULL && scan.htinfo != NULL &&
1345                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1346                                 ieee80211_ht_updateparams(ni,
1347                                     scan.htcap, scan.htinfo);
1348                                 /* XXX state changes? */
1349                         }
1350                         if (scan.tim != NULL) {
1351                                 struct ieee80211_tim_ie *tim =
1352                                     (struct ieee80211_tim_ie *) scan.tim;
1353 #if 0
1354                                 int aid = IEEE80211_AID(ni->ni_associd);
1355                                 int ix = aid / NBBY;
1356                                 int min = tim->tim_bitctl &~ 1;
1357                                 int max = tim->tim_len + min - 4;
1358                                 if ((tim->tim_bitctl&1) ||
1359                                     (min <= ix && ix <= max &&
1360                                      isset(tim->tim_bitmap - min, aid))) {
1361                                         /*
1362                                          * XXX Do not let bg scan kick off
1363                                          * we are expecting data.
1364                                          */
1365                                         ic->ic_lastdata = ticks;
1366                                         ieee80211_sta_pwrsave(vap, 0);
1367                                 }
1368 #endif
1369                                 ni->ni_dtim_count = tim->tim_count;
1370                                 ni->ni_dtim_period = tim->tim_period;
1371                         }
1372                         if (scan.csa != NULL &&
1373                             (vap->iv_flags & IEEE80211_F_DOTH))
1374                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
1375                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
1376                                 /*
1377                                  * No CSA ie or 11h disabled, but a channel
1378                                  * switch is pending; drop out so we aren't
1379                                  * stuck in CSA state.  If the AP really is
1380                                  * moving we'll get a beacon miss and scan.
1381                                  */
1382                                 IEEE80211_LOCK(ic);
1383                                 ieee80211_csa_cancelswitch(ic);
1384                                 IEEE80211_UNLOCK(ic);
1385                         }
1386                         /*
1387                          * If scanning, pass the info to the scan module.
1388                          * Otherwise, check if it's the right time to do
1389                          * a background scan.  Background scanning must
1390                          * be enabled and we must not be operating in the
1391                          * turbo phase of dynamic turbo mode.  Then,
1392                          * it's been a while since the last background
1393                          * scan and if no data frames have come through
1394                          * recently, kick off a scan.  Note that this
1395                          * is the mechanism by which a background scan
1396                          * is started _and_ continued each time we
1397                          * return on-channel to receive a beacon from
1398                          * our ap.
1399                          */
1400                         if (ic->ic_flags & IEEE80211_F_SCAN) {
1401                                 ieee80211_add_scan(vap, &scan, wh,
1402                                         subtype, rssi, nf);
1403                         } else if (contbgscan(vap)) {
1404                                 ieee80211_bg_scan(vap, 0);
1405                         } else if (startbgscan(vap)) {
1406                                 vap->iv_stats.is_scan_bg++;
1407 #if 0
1408                                 /* wakeup if we are sleeing */
1409                                 ieee80211_set_pwrsave(vap, 0);
1410 #endif
1411                                 ieee80211_bg_scan(vap, 0);
1412                         }
1413                         return;
1414                 }
1415                 /*
1416                  * If scanning, just pass information to the scan module.
1417                  */
1418                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1419                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
1420                                 /*
1421                                  * Actively scanning a channel marked passive;
1422                                  * send a probe request now that we know there
1423                                  * is 802.11 traffic present.
1424                                  *
1425                                  * XXX check if the beacon we recv'd gives
1426                                  * us what we need and suppress the probe req
1427                                  */
1428                                 ieee80211_probe_curchan(vap, 1);
1429                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1430                         }
1431                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1432                         return;
1433                 }
1434                 break;
1435         }
1436
1437         case IEEE80211_FC0_SUBTYPE_AUTH: {
1438                 uint16_t algo, seq, status;
1439                 /*
1440                  * auth frame format
1441                  *      [2] algorithm
1442                  *      [2] sequence
1443                  *      [2] status
1444                  *      [tlv*] challenge
1445                  */
1446                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1447                 algo   = le16toh(*(uint16_t *)frm);
1448                 seq    = le16toh(*(uint16_t *)(frm + 2));
1449                 status = le16toh(*(uint16_t *)(frm + 4));
1450                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1451                     "recv auth frame with algorithm %d seq %d", algo, seq);
1452
1453                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1454                         IEEE80211_DISCARD(vap,
1455                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1456                             wh, "auth", "%s", "TKIP countermeasures enabled");
1457                         vap->iv_stats.is_rx_auth_countermeasures++;
1458                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
1459                                 ieee80211_send_error(ni, wh->i_addr2,
1460                                         IEEE80211_FC0_SUBTYPE_AUTH,
1461                                         IEEE80211_REASON_MIC_FAILURE);
1462                         }
1463                         return;
1464                 }
1465                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1466                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1467                             seq, status);
1468                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1469                         sta_auth_open(ni, wh, rssi, nf, seq, status);
1470                 else {
1471                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1472                             wh, "auth", "unsupported alg %d", algo);
1473                         vap->iv_stats.is_rx_auth_unsupported++;
1474                         return;
1475                 }
1476                 break;
1477         }
1478
1479         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1480         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
1481                 uint16_t capinfo, associd;
1482                 uint16_t status;
1483
1484                 if (vap->iv_state != IEEE80211_S_ASSOC) {
1485                         vap->iv_stats.is_rx_mgtdiscard++;
1486                         return;
1487                 }
1488
1489                 /*
1490                  * asresp frame format
1491                  *      [2] capability information
1492                  *      [2] status
1493                  *      [2] association ID
1494                  *      [tlv] supported rates
1495                  *      [tlv] extended supported rates
1496                  *      [tlv] WME
1497                  *      [tlv] HT capabilities
1498                  *      [tlv] HT info
1499                  */
1500                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1501                 ni = vap->iv_bss;
1502                 capinfo = le16toh(*(uint16_t *)frm);
1503                 frm += 2;
1504                 status = le16toh(*(uint16_t *)frm);
1505                 frm += 2;
1506                 if (status != 0) {
1507                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1508                             wh->i_addr2, "%sassoc failed (reason %d)",
1509                             ISREASSOC(subtype) ?  "re" : "", status);
1510                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
1511                         return;
1512                 }
1513                 associd = le16toh(*(uint16_t *)frm);
1514                 frm += 2;
1515
1516                 rates = xrates = wme = htcap = htinfo = NULL;
1517                 while (efrm - frm > 1) {
1518                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1519                         switch (*frm) {
1520                         case IEEE80211_ELEMID_RATES:
1521                                 rates = frm;
1522                                 break;
1523                         case IEEE80211_ELEMID_XRATES:
1524                                 xrates = frm;
1525                                 break;
1526                         case IEEE80211_ELEMID_HTCAP:
1527                                 htcap = frm;
1528                                 break;
1529                         case IEEE80211_ELEMID_HTINFO:
1530                                 htinfo = frm;
1531                                 break;
1532                         case IEEE80211_ELEMID_VENDOR:
1533                                 if (iswmeoui(frm))
1534                                         wme = frm;
1535                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1536                                         /*
1537                                          * Accept pre-draft HT ie's if the
1538                                          * standard ones have not been seen.
1539                                          */
1540                                         if (ishtcapoui(frm)) {
1541                                                 if (htcap == NULL)
1542                                                         htcap = frm;
1543                                         } else if (ishtinfooui(frm)) {
1544                                                 if (htinfo == NULL)
1545                                                         htcap = frm;
1546                                         }
1547                                 }
1548                                 /* XXX Atheros OUI support */
1549                                 break;
1550                         }
1551                         frm += frm[1] + 2;
1552                 }
1553
1554                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1555                 if (xrates != NULL)
1556                         IEEE80211_VERIFY_ELEMENT(xrates,
1557                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1558                 rate = ieee80211_setup_rates(ni, rates, xrates,
1559                                 IEEE80211_F_JOIN |
1560                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
1561                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
1562                 if (rate & IEEE80211_RATE_BASIC) {
1563                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
1564                             wh->i_addr2,
1565                             "%sassoc failed (rate set mismatch)",
1566                             ISREASSOC(subtype) ?  "re" : "");
1567                         vap->iv_stats.is_rx_assoc_norate++;
1568                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
1569                             IEEE80211_SCAN_FAIL_STATUS);
1570                         return;
1571                 }
1572
1573                 ni->ni_capinfo = capinfo;
1574                 ni->ni_associd = associd;
1575                 if (ni->ni_jointime == 0)
1576                         ni->ni_jointime = time_uptime;
1577                 if (wme != NULL &&
1578                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
1579                         ni->ni_flags |= IEEE80211_NODE_QOS;
1580                         ieee80211_wme_updateparams(vap);
1581                 } else
1582                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
1583                 /*
1584                  * Setup HT state according to the negotiation.
1585                  *
1586                  * NB: shouldn't need to check if HT use is enabled but some
1587                  *     ap's send back HT ie's even when we don't indicate we
1588                  *     are HT capable in our AssocReq.
1589                  */
1590                 if (htcap != NULL && htinfo != NULL &&
1591                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
1592                         ieee80211_ht_node_init(ni);
1593                         ieee80211_ht_updateparams(ni, htcap, htinfo);
1594                         ieee80211_setup_htrates(ni, htcap,
1595                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
1596                         ieee80211_setup_basic_htrates(ni, htinfo);
1597                         ieee80211_node_setuptxparms(ni);
1598                 } else {
1599 #ifdef IEEE80211_SUPPORT_SUPERG
1600                         if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
1601                                 ieee80211_ff_node_init(ni);
1602 #endif
1603                 }
1604                 /*
1605                  * Configure state now that we are associated.
1606                  *
1607                  * XXX may need different/additional driver callbacks?
1608                  */
1609                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1610                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1611                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1612                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
1613                 } else {
1614                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
1615                         ic->ic_flags |= IEEE80211_F_USEBARKER;
1616                 }
1617                 ieee80211_set_shortslottime(ic,
1618                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
1619                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
1620                 /*
1621                  * Honor ERP protection.
1622                  *
1623                  * NB: ni_erp should zero for non-11g operation.
1624                  */
1625                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1626                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
1627                         ic->ic_flags |= IEEE80211_F_USEPROT;
1628                 else
1629                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
1630                 IEEE80211_NOTE_MAC(vap,
1631                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
1632                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
1633                     ISREASSOC(subtype) ? "re" : "",
1634                     IEEE80211_NODE_AID(ni),
1635                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
1636                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
1637                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
1638                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
1639                     ni->ni_flags & IEEE80211_NODE_HT ?
1640                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
1641                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
1642                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
1643                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
1644                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
1645                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
1646                         ", fast-frames" : "",
1647                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
1648                         ", turbo" : ""
1649                 );
1650                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
1651                 break;
1652         }
1653
1654         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
1655                 uint16_t reason;
1656
1657                 if (vap->iv_state == IEEE80211_S_SCAN) {
1658                         vap->iv_stats.is_rx_mgtdiscard++;
1659                         return;
1660                 }
1661                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1662                         /* NB: can happen when in promiscuous mode */
1663                         vap->iv_stats.is_rx_mgtdiscard++;
1664                         break;
1665                 }
1666
1667                 /*
1668                  * deauth frame format
1669                  *      [2] reason
1670                  */
1671                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1672                 reason = le16toh(*(uint16_t *)frm);
1673
1674                 vap->iv_stats.is_rx_deauth++;
1675                 vap->iv_stats.is_rx_deauth_code = reason;
1676                 IEEE80211_NODE_STAT(ni, rx_deauth);
1677
1678                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1679                     "recv deauthenticate (reason %d)", reason);
1680                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
1681                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
1682                 break;
1683         }
1684
1685         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
1686                 uint16_t reason;
1687
1688                 if (vap->iv_state != IEEE80211_S_RUN &&
1689                     vap->iv_state != IEEE80211_S_ASSOC &&
1690                     vap->iv_state != IEEE80211_S_AUTH) {
1691                         vap->iv_stats.is_rx_mgtdiscard++;
1692                         return;
1693                 }
1694                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
1695                         /* NB: can happen when in promiscuous mode */
1696                         vap->iv_stats.is_rx_mgtdiscard++;
1697                         break;
1698                 }
1699
1700                 /*
1701                  * disassoc frame format
1702                  *      [2] reason
1703                  */
1704                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
1705                 reason = le16toh(*(uint16_t *)frm);
1706
1707                 vap->iv_stats.is_rx_disassoc++;
1708                 vap->iv_stats.is_rx_disassoc_code = reason;
1709                 IEEE80211_NODE_STAT(ni, rx_disassoc);
1710
1711                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1712                     "recv disassociate (reason %d)", reason);
1713                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
1714                 break;
1715         }
1716
1717         case IEEE80211_FC0_SUBTYPE_ACTION:
1718                 if (vap->iv_state == IEEE80211_S_RUN) {
1719                         if (ieee80211_parse_action(ni, m0) == 0)
1720                                 ic->ic_recv_action(ni, wh, frm, efrm);
1721                 } else
1722                         vap->iv_stats.is_rx_mgtdiscard++;
1723                 break;
1724
1725         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1726         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1727         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1728                 vap->iv_stats.is_rx_mgtdiscard++;
1729                 return;
1730         default:
1731                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1732                      wh, "mgt", "subtype 0x%x not handled", subtype);
1733                 vap->iv_stats.is_rx_badsubtype++;
1734                 break;
1735         }
1736 #undef ISREASSOC
1737 #undef ISPROBE
1738 }
1739
1740 static void
1741 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
1742 {
1743 }