The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_sta.c

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    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: releng/8.0/sys/net80211/ieee80211_sta.c 195377 2009-07-05 17:59:19Z sam $");
   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 }

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