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("$FreeBSD$");
   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 #include <net80211/ieee80211_ratectl.h>
   64 
   65 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
   66 
   67 static  void sta_vattach(struct ieee80211vap *);
   68 static  void sta_beacon_miss(struct ieee80211vap *);
   69 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   70 static  int sta_input(struct ieee80211_node *, struct mbuf *, int, int);
   71 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
   72             int subtype, int rssi, int nf);
   73 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
   74 
   75 void
   76 ieee80211_sta_attach(struct ieee80211com *ic)
   77 {
   78         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
   79 }
   80 
   81 void
   82 ieee80211_sta_detach(struct ieee80211com *ic)
   83 {
   84 }
   85 
   86 static void
   87 sta_vdetach(struct ieee80211vap *vap)
   88 {
   89 }
   90 
   91 static void
   92 sta_vattach(struct ieee80211vap *vap)
   93 {
   94         vap->iv_newstate = sta_newstate;
   95         vap->iv_input = sta_input;
   96         vap->iv_recv_mgmt = sta_recv_mgmt;
   97         vap->iv_recv_ctl = sta_recv_ctl;
   98         vap->iv_opdetach = sta_vdetach;
   99         vap->iv_bmiss = sta_beacon_miss;
  100 }
  101 
  102 /*
  103  * Handle a beacon miss event.  The common code filters out
  104  * spurious events that can happen when scanning and/or before
  105  * reaching RUN state.
  106  */
  107 static void
  108 sta_beacon_miss(struct ieee80211vap *vap)
  109 {
  110         struct ieee80211com *ic = vap->iv_ic;
  111 
  112         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
  113         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
  114             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
  115 
  116         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
  117             "beacon miss, mode %s state %s\n",
  118             ieee80211_opmode_name[vap->iv_opmode],
  119             ieee80211_state_name[vap->iv_state]);
  120 
  121         if (vap->iv_state == IEEE80211_S_CSA) {
  122                 /*
  123                  * A Channel Switch is pending; assume we missed the
  124                  * beacon that would've completed the process and just
  125                  * force the switch.  If we made a mistake we'll not
  126                  * find the AP on the new channel and fall back to a
  127                  * normal scan.
  128                  */
  129                 ieee80211_csa_completeswitch(ic);
  130                 return;
  131         }
  132         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
  133                 /*
  134                  * Send a directed probe req before falling back to a
  135                  * scan; if we receive a response ic_bmiss_count will
  136                  * be reset.  Some cards mistakenly report beacon miss
  137                  * so this avoids the expensive scan if the ap is
  138                  * still there.
  139                  */
  140                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
  141                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
  142                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
  143                 return;
  144         }
  145 
  146         callout_stop(&vap->iv_swbmiss);
  147         vap->iv_bmiss_count = 0;
  148         vap->iv_stats.is_beacon_miss++;
  149         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
  150 #ifdef IEEE80211_SUPPORT_SUPERG
  151                 struct ieee80211com *ic = vap->iv_ic;
  152 
  153                 /*
  154                  * If we receive a beacon miss interrupt when using
  155                  * dynamic turbo, attempt to switch modes before
  156                  * reassociating.
  157                  */
  158                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
  159                         ieee80211_dturbo_switch(vap,
  160                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
  161 #endif
  162                 /*
  163                  * Try to reassociate before scanning for a new ap.
  164                  */
  165                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
  166         } else {
  167                 /*
  168                  * Somebody else is controlling state changes (e.g.
  169                  * a user-mode app) don't do anything that would
  170                  * confuse them; just drop into scan mode so they'll
  171                  * notified of the state change and given control.
  172                  */
  173                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
  174         }
  175 }
  176 
  177 /*
  178  * Handle deauth with reason.  We retry only for
  179  * the cases where we might succeed.  Otherwise
  180  * we downgrade the ap and scan.
  181  */
  182 static void
  183 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
  184 {
  185         switch (reason) {
  186         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
  187         case IEEE80211_STATUS_TIMEOUT:
  188         case IEEE80211_REASON_ASSOC_EXPIRE:
  189         case IEEE80211_REASON_NOT_AUTHED:
  190         case IEEE80211_REASON_NOT_ASSOCED:
  191         case IEEE80211_REASON_ASSOC_LEAVE:
  192         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
  193                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
  194                 break;
  195         default:
  196                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
  197                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
  198                         ieee80211_check_scan_current(vap);
  199                 break;
  200         }
  201 }
  202 
  203 /*
  204  * IEEE80211_M_STA vap state machine handler.
  205  * This routine handles the main states in the 802.11 protocol.
  206  */
  207 static int
  208 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  209 {
  210         struct ieee80211com *ic = vap->iv_ic;
  211         struct ieee80211_node *ni;
  212         enum ieee80211_state ostate;
  213 
  214         IEEE80211_LOCK_ASSERT(ic);
  215 
  216         ostate = vap->iv_state;
  217         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  218             __func__, ieee80211_state_name[ostate],
  219             ieee80211_state_name[nstate], arg);
  220         vap->iv_state = nstate;                 /* state transition */
  221         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
  222         if (ostate != IEEE80211_S_SCAN)
  223                 ieee80211_cancel_scan(vap);     /* background scan */
  224         ni = vap->iv_bss;                       /* NB: no reference held */
  225         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
  226                 callout_stop(&vap->iv_swbmiss);
  227         switch (nstate) {
  228         case IEEE80211_S_INIT:
  229                 switch (ostate) {
  230                 case IEEE80211_S_SLEEP:
  231                         /* XXX wakeup */
  232                 case IEEE80211_S_RUN:
  233                         IEEE80211_SEND_MGMT(ni,
  234                             IEEE80211_FC0_SUBTYPE_DISASSOC,
  235                             IEEE80211_REASON_ASSOC_LEAVE);
  236                         ieee80211_sta_leave(ni);
  237                         break;
  238                 case IEEE80211_S_ASSOC:
  239                         IEEE80211_SEND_MGMT(ni,
  240                             IEEE80211_FC0_SUBTYPE_DEAUTH,
  241                             IEEE80211_REASON_AUTH_LEAVE);
  242                         break;
  243                 case IEEE80211_S_SCAN:
  244                         ieee80211_cancel_scan(vap);
  245                         break;
  246                 default:
  247                         goto invalid;
  248                 }
  249                 if (ostate != IEEE80211_S_INIT) {
  250                         /* NB: optimize INIT -> INIT case */
  251                         ieee80211_reset_bss(vap);
  252                 }
  253                 if (vap->iv_auth->ia_detach != NULL)
  254                         vap->iv_auth->ia_detach(vap);
  255                 break;
  256         case IEEE80211_S_SCAN:
  257                 switch (ostate) {
  258                 case IEEE80211_S_INIT:
  259                         /*
  260                          * Initiate a scan.  We can come here as a result
  261                          * of an IEEE80211_IOC_SCAN_REQ too in which case
  262                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
  263                          * and the scan request parameters will be present
  264                          * in iv_scanreq.  Otherwise we do the default.
  265                          */
  266                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
  267                                 ieee80211_check_scan(vap,
  268                                     vap->iv_scanreq_flags,
  269                                     vap->iv_scanreq_duration,
  270                                     vap->iv_scanreq_mindwell,
  271                                     vap->iv_scanreq_maxdwell,
  272                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
  273                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
  274                         } else
  275                                 ieee80211_check_scan_current(vap);
  276                         break;
  277                 case IEEE80211_S_SCAN:
  278                 case IEEE80211_S_AUTH:
  279                 case IEEE80211_S_ASSOC:
  280                         /*
  281                          * These can happen either because of a timeout
  282                          * on an assoc/auth response or because of a
  283                          * change in state that requires a reset.  For
  284                          * the former we're called with a non-zero arg
  285                          * that is the cause for the failure; pass this
  286                          * to the scan code so it can update state.
  287                          * Otherwise trigger a new scan unless we're in
  288                          * manual roaming mode in which case an application
  289                          * must issue an explicit scan request.
  290                          */
  291                         if (arg != 0)
  292                                 ieee80211_scan_assoc_fail(vap,
  293                                         vap->iv_bss->ni_macaddr, arg);
  294                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
  295                                 ieee80211_check_scan_current(vap);
  296                         break;
  297                 case IEEE80211_S_RUN:           /* beacon miss */
  298                         /*
  299                          * Beacon miss.  Notify user space and if not
  300                          * under control of a user application (roaming
  301                          * manual) kick off a scan to re-connect.
  302                          */
  303                         ieee80211_sta_leave(ni);
  304                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
  305                                 ieee80211_check_scan_current(vap);
  306                         break;
  307                 default:
  308                         goto invalid;
  309                 }
  310                 break;
  311         case IEEE80211_S_AUTH:
  312                 switch (ostate) {
  313                 case IEEE80211_S_INIT:
  314                 case IEEE80211_S_SCAN:
  315                         IEEE80211_SEND_MGMT(ni,
  316                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
  317                         break;
  318                 case IEEE80211_S_AUTH:
  319                 case IEEE80211_S_ASSOC:
  320                         switch (arg & 0xff) {
  321                         case IEEE80211_FC0_SUBTYPE_AUTH:
  322                                 /* ??? */
  323                                 IEEE80211_SEND_MGMT(ni,
  324                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
  325                                 break;
  326                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
  327                                 sta_authretry(vap, ni, arg>>8);
  328                                 break;
  329                         }
  330                         break;
  331                 case IEEE80211_S_RUN:
  332                         switch (arg & 0xff) {
  333                         case IEEE80211_FC0_SUBTYPE_AUTH:
  334                                 IEEE80211_SEND_MGMT(ni,
  335                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
  336                                 vap->iv_state = ostate; /* stay RUN */
  337                                 break;
  338                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
  339                                 ieee80211_sta_leave(ni);
  340                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
  341                                         /* try to reauth */
  342                                         IEEE80211_SEND_MGMT(ni,
  343                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
  344                                 }
  345                                 break;
  346                         }
  347                         break;
  348                 default:
  349                         goto invalid;
  350                 }
  351                 break;
  352         case IEEE80211_S_ASSOC:
  353                 switch (ostate) {
  354                 case IEEE80211_S_AUTH:
  355                 case IEEE80211_S_ASSOC:
  356                         IEEE80211_SEND_MGMT(ni,
  357                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
  358                         break;
  359                 case IEEE80211_S_SLEEP:         /* cannot happen */
  360                 case IEEE80211_S_RUN:
  361                         ieee80211_sta_leave(ni);
  362                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
  363                                 IEEE80211_SEND_MGMT(ni, arg ?
  364                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
  365                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
  366                         }
  367                         break;
  368                 default:
  369                         goto invalid;
  370                 }
  371                 break;
  372         case IEEE80211_S_RUN:
  373                 if (vap->iv_flags & IEEE80211_F_WPA) {
  374                         /* XXX validate prerequisites */
  375                 }
  376                 switch (ostate) {
  377                 case IEEE80211_S_RUN:
  378                 case IEEE80211_S_CSA:
  379                         break;
  380                 case IEEE80211_S_AUTH:          /* when join is done in fw */
  381                 case IEEE80211_S_ASSOC:
  382 #ifdef IEEE80211_DEBUG
  383                         if (ieee80211_msg_debug(vap)) {
  384                                 ieee80211_note(vap, "%s with %s ssid ",
  385                                     (vap->iv_opmode == IEEE80211_M_STA ?
  386                                     "associated" : "synchronized"),
  387                                     ether_sprintf(ni->ni_bssid));
  388                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
  389                                     ni->ni_esslen);
  390                                 /* XXX MCS/HT */
  391                                 printf(" channel %d start %uMb\n",
  392                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
  393                                     IEEE80211_RATE2MBS(ni->ni_txrate));
  394                         }
  395 #endif
  396                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
  397                         ieee80211_notify_node_join(ni, 
  398                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
  399                         break;
  400                 case IEEE80211_S_SLEEP:
  401                         ieee80211_sta_pwrsave(vap, 0);
  402                         break;
  403                 default:
  404                         goto invalid;
  405                 }
  406                 ieee80211_sync_curchan(ic);
  407                 if (ostate != IEEE80211_S_RUN &&
  408                     (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
  409                         /*
  410                          * Start s/w beacon miss timer for devices w/o
  411                          * hardware support.  We fudge a bit here since
  412                          * we're doing this in software.
  413                          */
  414                         vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
  415                                 2 * vap->iv_bmissthreshold * ni->ni_intval);
  416                         vap->iv_swbmiss_count = 0;
  417                         callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
  418                                 ieee80211_swbmiss, vap);
  419                 }
  420                 /*
  421                  * When 802.1x is not in use mark the port authorized
  422                  * at this point so traffic can flow.
  423                  */
  424                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
  425                         ieee80211_node_authorize(ni);
  426                 /*
  427                  * Fake association when joining an existing bss.
  428                  */
  429                 if (ic->ic_newassoc != NULL)
  430                         ic->ic_newassoc(vap->iv_bss, ostate != IEEE80211_S_RUN);
  431                 break;
  432         case IEEE80211_S_CSA:
  433                 if (ostate != IEEE80211_S_RUN)
  434                         goto invalid;
  435                 break;
  436         case IEEE80211_S_SLEEP:
  437                 ieee80211_sta_pwrsave(vap, 0);
  438                 break;
  439         default:
  440         invalid:
  441                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  442                     "%s: unexpected state transition %s -> %s\n", __func__,
  443                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
  444                 break;
  445         }
  446         return 0;
  447 }
  448 
  449 /*
  450  * Return non-zero if the frame is an echo of a multicast
  451  * frame sent by ourself.  The dir is known to be DSTODS.
  452  */
  453 static __inline int
  454 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
  455 {
  456 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
  457 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
  458         const uint8_t *sa;
  459 
  460         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
  461 
  462         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
  463                 return 0;
  464         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
  465         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
  466 #undef WH4
  467 #undef QWH4
  468 }
  469 
  470 /*
  471  * Return non-zero if the frame is an echo of a multicast
  472  * frame sent by ourself.  The dir is known to be FROMDS.
  473  */
  474 static __inline int
  475 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
  476 {
  477         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
  478 
  479         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
  480                 return 0;
  481         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
  482 }
  483 
  484 /*
  485  * Decide if a received management frame should be
  486  * printed when debugging is enabled.  This filters some
  487  * of the less interesting frames that come frequently
  488  * (e.g. beacons).
  489  */
  490 static __inline int
  491 doprint(struct ieee80211vap *vap, int subtype)
  492 {
  493         switch (subtype) {
  494         case IEEE80211_FC0_SUBTYPE_BEACON:
  495                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
  496         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  497                 return 0;
  498         }
  499         return 1;
  500 }
  501 
  502 /*
  503  * Process a received frame.  The node associated with the sender
  504  * should be supplied.  If nothing was found in the node table then
  505  * the caller is assumed to supply a reference to iv_bss instead.
  506  * The RSSI and a timestamp are also supplied.  The RSSI data is used
  507  * during AP scanning to select a AP to associate with; it can have
  508  * any units so long as values have consistent units and higher values
  509  * mean ``better signal''.  The receive timestamp is currently not used
  510  * by the 802.11 layer.
  511  */
  512 static int
  513 sta_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
  514 {
  515 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
  516 #define HAS_SEQ(type)   ((type & 0x4) == 0)
  517         struct ieee80211vap *vap = ni->ni_vap;
  518         struct ieee80211com *ic = ni->ni_ic;
  519         struct ifnet *ifp = vap->iv_ifp;
  520         struct ieee80211_frame *wh;
  521         struct ieee80211_key *key;
  522         struct ether_header *eh;
  523         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
  524         uint8_t dir, type, subtype, qos;
  525         uint8_t *bssid;
  526         uint16_t rxseq;
  527 
  528         if (m->m_flags & M_AMPDU_MPDU) {
  529                 /*
  530                  * Fastpath for A-MPDU reorder q resubmission.  Frames
  531                  * w/ M_AMPDU_MPDU marked have already passed through
  532                  * here but were received out of order and been held on
  533                  * the reorder queue.  When resubmitted they are marked
  534                  * with the M_AMPDU_MPDU flag and we can bypass most of
  535                  * the normal processing.
  536                  */
  537                 wh = mtod(m, struct ieee80211_frame *);
  538                 type = IEEE80211_FC0_TYPE_DATA;
  539                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  540                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
  541                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
  542                 goto resubmit_ampdu;
  543         }
  544 
  545         KASSERT(ni != NULL, ("null node"));
  546         ni->ni_inact = ni->ni_inact_reload;
  547 
  548         type = -1;                      /* undefined */
  549 
  550         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
  551                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  552                     ni->ni_macaddr, NULL,
  553                     "too short (1): len %u", m->m_pkthdr.len);
  554                 vap->iv_stats.is_rx_tooshort++;
  555                 goto out;
  556         }
  557         /*
  558          * Bit of a cheat here, we use a pointer for a 3-address
  559          * frame format but don't reference fields past outside
  560          * ieee80211_frame_min w/o first validating the data is
  561          * present.
  562          */
  563         wh = mtod(m, struct ieee80211_frame *);
  564 
  565         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  566             IEEE80211_FC0_VERSION_0) {
  567                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  568                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
  569                     wh->i_fc[0], wh->i_fc[1]);
  570                 vap->iv_stats.is_rx_badversion++;
  571                 goto err;
  572         }
  573 
  574         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  575         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  576         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  577         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
  578                 bssid = wh->i_addr2;
  579                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
  580                         /* not interested in */
  581                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  582                             bssid, NULL, "%s", "not to bss");
  583                         vap->iv_stats.is_rx_wrongbss++;
  584                         goto out;
  585                 }
  586                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  587                 ni->ni_noise = nf;
  588                 if (HAS_SEQ(type) && !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  589                         uint8_t tid = ieee80211_gettid(wh);
  590                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
  591                             TID_TO_WME_AC(tid) >= WME_AC_VI)
  592                                 ic->ic_wme.wme_hipri_traffic++;
  593                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  594                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
  595                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
  596                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
  597                                 /* duplicate, discard */
  598                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  599                                     bssid, "duplicate",
  600                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
  601                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
  602                                     ni->ni_rxseqs[tid] >>
  603                                         IEEE80211_SEQ_SEQ_SHIFT,
  604                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
  605                                     ni->ni_rxseqs[tid] &
  606                                         IEEE80211_SEQ_FRAG_MASK,
  607                                     tid);
  608                                 vap->iv_stats.is_rx_dup++;
  609                                 IEEE80211_NODE_STAT(ni, rx_dup);
  610                                 goto out;
  611                         }
  612                         ni->ni_rxseqs[tid] = rxseq;
  613                 }
  614         }
  615 
  616         switch (type) {
  617         case IEEE80211_FC0_TYPE_DATA:
  618                 hdrspace = ieee80211_hdrspace(ic, wh);
  619                 if (m->m_len < hdrspace &&
  620                     (m = m_pullup(m, hdrspace)) == NULL) {
  621                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  622                             ni->ni_macaddr, NULL,
  623                             "data too short: expecting %u", hdrspace);
  624                         vap->iv_stats.is_rx_tooshort++;
  625                         goto out;               /* XXX */
  626                 }
  627                 /*
  628                  * Handle A-MPDU re-ordering.  If the frame is to be
  629                  * processed directly then ieee80211_ampdu_reorder
  630                  * will return 0; otherwise it has consumed the mbuf
  631                  * and we should do nothing more with it.
  632                  */
  633                 if ((m->m_flags & M_AMPDU) &&
  634                     (dir == IEEE80211_FC1_DIR_FROMDS ||
  635                      dir == IEEE80211_FC1_DIR_DSTODS) &&
  636                     ieee80211_ampdu_reorder(ni, m) != 0) {
  637                         m = NULL;
  638                         goto out;
  639                 }
  640         resubmit_ampdu:
  641                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
  642                         if ((ifp->if_flags & IFF_SIMPLEX) &&
  643                             isfromds_mcastecho(vap, wh)) {
  644                                 /*
  645                                  * In IEEE802.11 network, multicast
  646                                  * packets sent from "me" are broadcast
  647                                  * from the AP; silently discard for
  648                                  * SIMPLEX interface.
  649                                  */
  650                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  651                                     wh, "data", "%s", "multicast echo");
  652                                 vap->iv_stats.is_rx_mcastecho++;
  653                                 goto out;
  654                         }
  655                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
  656                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  657                                 /*
  658                                  * DWDS sta's must drop 3-address mcast frames
  659                                  * as they will be sent separately as a 4-addr
  660                                  * frame.  Accepting the 3-addr frame will
  661                                  * confuse the bridge into thinking the sending
  662                                  * sta is located at the end of WDS link.
  663                                  */
  664                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
  665                                     "3-address data", "%s", "DWDS enabled");
  666                                 vap->iv_stats.is_rx_mcastecho++;
  667                                 goto out;
  668                         }
  669                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
  670                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
  671                                 IEEE80211_DISCARD(vap,
  672                                     IEEE80211_MSG_INPUT, wh, "4-address data",
  673                                     "%s", "DWDS not enabled");
  674                                 vap->iv_stats.is_rx_wrongdir++;
  675                                 goto out;
  676                         }
  677                         if ((ifp->if_flags & IFF_SIMPLEX) &&
  678                             isdstods_mcastecho(vap, wh)) {
  679                                 /*
  680                                  * In IEEE802.11 network, multicast
  681                                  * packets sent from "me" are broadcast
  682                                  * from the AP; silently discard for
  683                                  * SIMPLEX interface.
  684                                  */
  685                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
  686                                     "4-address data", "%s", "multicast echo");
  687                                 vap->iv_stats.is_rx_mcastecho++;
  688                                 goto out;
  689                         }
  690                 } else {
  691                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
  692                             "data", "incorrect dir 0x%x", dir);
  693                         vap->iv_stats.is_rx_wrongdir++;
  694                         goto out;
  695                 }
  696 
  697                 /*
  698                  * Handle privacy requirements.  Note that we
  699                  * must not be preempted from here until after
  700                  * we (potentially) call ieee80211_crypto_demic;
  701                  * otherwise we may violate assumptions in the
  702                  * crypto cipher modules used to do delayed update
  703                  * of replay sequence numbers.
  704                  */
  705                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  706                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  707                                 /*
  708                                  * Discard encrypted frames when privacy is off.
  709                                  */
  710                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  711                                     wh, "WEP", "%s", "PRIVACY off");
  712                                 vap->iv_stats.is_rx_noprivacy++;
  713                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
  714                                 goto out;
  715                         }
  716                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  717                         if (key == NULL) {
  718                                 /* NB: stats+msgs handled in crypto_decap */
  719                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
  720                                 goto out;
  721                         }
  722                         wh = mtod(m, struct ieee80211_frame *);
  723                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
  724                 } else {
  725                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
  726                         key = NULL;
  727                 }
  728 
  729                 /*
  730                  * Save QoS bits for use below--before we strip the header.
  731                  */
  732                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
  733                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
  734                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
  735                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
  736                 } else
  737                         qos = 0;
  738 
  739                 /*
  740                  * Next up, any fragmentation.
  741                  */
  742                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  743                         m = ieee80211_defrag(ni, m, hdrspace);
  744                         if (m == NULL) {
  745                                 /* Fragment dropped or frame not complete yet */
  746                                 goto out;
  747                         }
  748                 }
  749                 wh = NULL;              /* no longer valid, catch any uses */
  750 
  751                 /*
  752                  * Next strip any MSDU crypto bits.
  753                  */
  754                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
  755                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  756                             ni->ni_macaddr, "data", "%s", "demic error");
  757                         vap->iv_stats.is_rx_demicfail++;
  758                         IEEE80211_NODE_STAT(ni, rx_demicfail);
  759                         goto out;
  760                 }
  761 
  762                 /* copy to listener after decrypt */
  763                 if (ieee80211_radiotap_active_vap(vap))
  764                         ieee80211_radiotap_rx(vap, m);
  765                 need_tap = 0;
  766 
  767                 /*
  768                  * Finally, strip the 802.11 header.
  769                  */
  770                 m = ieee80211_decap(vap, m, hdrspace);
  771                 if (m == NULL) {
  772                         /* XXX mask bit to check for both */
  773                         /* don't count Null data frames as errors */
  774                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
  775                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
  776                                 goto out;
  777                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  778                             ni->ni_macaddr, "data", "%s", "decap error");
  779                         vap->iv_stats.is_rx_decap++;
  780                         IEEE80211_NODE_STAT(ni, rx_decap);
  781                         goto err;
  782                 }
  783                 eh = mtod(m, struct ether_header *);
  784                 if (!ieee80211_node_is_authorized(ni)) {
  785                         /*
  786                          * Deny any non-PAE frames received prior to
  787                          * authorization.  For open/shared-key
  788                          * authentication the port is mark authorized
  789                          * after authentication completes.  For 802.1x
  790                          * the port is not marked authorized by the
  791                          * authenticator until the handshake has completed.
  792                          */
  793                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
  794                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  795                                     eh->ether_shost, "data",
  796                                     "unauthorized port: ether type 0x%x len %u",
  797                                     eh->ether_type, m->m_pkthdr.len);
  798                                 vap->iv_stats.is_rx_unauth++;
  799                                 IEEE80211_NODE_STAT(ni, rx_unauth);
  800                                 goto err;
  801                         }
  802                 } else {
  803                         /*
  804                          * When denying unencrypted frames, discard
  805                          * any non-PAE frames received without encryption.
  806                          */
  807                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
  808                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
  809                             eh->ether_type != htons(ETHERTYPE_PAE)) {
  810                                 /*
  811                                  * Drop unencrypted frames.
  812                                  */
  813                                 vap->iv_stats.is_rx_unencrypted++;
  814                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
  815                                 goto out;
  816                         }
  817                 }
  818                 /* XXX require HT? */
  819                 if (qos & IEEE80211_QOS_AMSDU) {
  820                         m = ieee80211_decap_amsdu(ni, m);
  821                         if (m == NULL)
  822                                 return IEEE80211_FC0_TYPE_DATA;
  823                 } else {
  824 #ifdef IEEE80211_SUPPORT_SUPERG
  825                         m = ieee80211_decap_fastframe(vap, ni, m);
  826                         if (m == NULL)
  827                                 return IEEE80211_FC0_TYPE_DATA;
  828 #endif
  829                 }
  830                 ieee80211_deliver_data(vap, ni, m);
  831                 return IEEE80211_FC0_TYPE_DATA;
  832 
  833         case IEEE80211_FC0_TYPE_MGT:
  834                 vap->iv_stats.is_rx_mgmt++;
  835                 IEEE80211_NODE_STAT(ni, rx_mgmt);
  836                 if (dir != IEEE80211_FC1_DIR_NODS) {
  837                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  838                             wh, "data", "incorrect dir 0x%x", dir);
  839                         vap->iv_stats.is_rx_wrongdir++;
  840                         goto err;
  841                 }
  842                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  843                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  844                             ni->ni_macaddr, "mgt", "too short: len %u",
  845                             m->m_pkthdr.len);
  846                         vap->iv_stats.is_rx_tooshort++;
  847                         goto out;
  848                 }
  849 #ifdef IEEE80211_DEBUG
  850                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
  851                     ieee80211_msg_dumppkts(vap)) {
  852                         if_printf(ifp, "received %s from %s rssi %d\n",
  853                             ieee80211_mgt_subtype_name[subtype >>
  854                                 IEEE80211_FC0_SUBTYPE_SHIFT],
  855                             ether_sprintf(wh->i_addr2), rssi);
  856                 }
  857 #endif
  858                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  859                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
  860                                 /*
  861                                  * Only shared key auth frames with a challenge
  862                                  * should be encrypted, discard all others.
  863                                  */
  864                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  865                                     wh, ieee80211_mgt_subtype_name[subtype >>
  866                                         IEEE80211_FC0_SUBTYPE_SHIFT],
  867                                     "%s", "WEP set but not permitted");
  868                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
  869                                 goto out;
  870                         }
  871                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  872                                 /*
  873                                  * Discard encrypted frames when privacy is off.
  874                                  */
  875                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  876                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
  877                                 vap->iv_stats.is_rx_noprivacy++;
  878                                 goto out;
  879                         }
  880                         hdrspace = ieee80211_hdrspace(ic, wh);
  881                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  882                         if (key == NULL) {
  883                                 /* NB: stats+msgs handled in crypto_decap */
  884                                 goto out;
  885                         }
  886                         wh = mtod(m, struct ieee80211_frame *);
  887                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
  888                 }
  889                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
  890                 goto out;
  891 
  892         case IEEE80211_FC0_TYPE_CTL:
  893                 vap->iv_stats.is_rx_ctl++;
  894                 IEEE80211_NODE_STAT(ni, rx_ctrl);
  895                 vap->iv_recv_ctl(ni, m, subtype);
  896                 goto out;
  897 
  898         default:
  899                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  900                     wh, NULL, "bad frame type 0x%x", type);
  901                 /* should not come here */
  902                 break;
  903         }
  904 err:
  905         ifp->if_ierrors++;
  906 out:
  907         if (m != NULL) {
  908                 if (need_tap && ieee80211_radiotap_active_vap(vap))
  909                         ieee80211_radiotap_rx(vap, m);
  910                 m_freem(m);
  911         }
  912         return type;
  913 #undef SEQ_LEQ
  914 }
  915 
  916 static void
  917 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
  918     int rssi, int nf, uint16_t seq, uint16_t status)
  919 {
  920         struct ieee80211vap *vap = ni->ni_vap;
  921 
  922         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
  923                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
  924                     ni->ni_macaddr, "open auth",
  925                     "bad sta auth mode %u", ni->ni_authmode);
  926                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
  927                 return;
  928         }
  929         if (vap->iv_state != IEEE80211_S_AUTH ||
  930             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
  931                 vap->iv_stats.is_rx_bad_auth++;
  932                 return;
  933         }
  934         if (status != 0) {
  935                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
  936                     ni, "open auth failed (reason %d)", status);
  937                 vap->iv_stats.is_rx_auth_fail++;
  938                 vap->iv_stats.is_rx_authfail_code = status;
  939                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
  940                     IEEE80211_SCAN_FAIL_STATUS);
  941         } else
  942                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
  943 }
  944 
  945 static void
  946 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
  947     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
  948     uint16_t seq, uint16_t status)
  949 {
  950         struct ieee80211vap *vap = ni->ni_vap;
  951         uint8_t *challenge;
  952         int estatus;
  953 
  954         /*
  955          * NB: this can happen as we allow pre-shared key
  956          * authentication to be enabled w/o wep being turned
  957          * on so that configuration of these can be done
  958          * in any order.  It may be better to enforce the
  959          * ordering in which case this check would just be
  960          * for sanity/consistency.
  961          */
  962         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  963                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
  964                     ni->ni_macaddr, "shared key auth",
  965                     "%s", " PRIVACY is disabled");
  966                 estatus = IEEE80211_STATUS_ALG;
  967                 goto bad;
  968         }
  969         /*
  970          * Pre-shared key authentication is evil; accept
  971          * it only if explicitly configured (it is supported
  972          * mainly for compatibility with clients like OS X).
  973          */
  974         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
  975             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
  976                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
  977                     ni->ni_macaddr, "shared key auth",
  978                     "bad sta auth mode %u", ni->ni_authmode);
  979                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
  980                 estatus = IEEE80211_STATUS_ALG;
  981                 goto bad;
  982         }
  983 
  984         challenge = NULL;
  985         if (frm + 1 < efrm) {
  986                 if ((frm[1] + 2) > (efrm - frm)) {
  987                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
  988                             ni->ni_macaddr, "shared key auth",
  989                             "ie %d/%d too long",
  990                             frm[0], (frm[1] + 2) - (efrm - frm));
  991                         vap->iv_stats.is_rx_bad_auth++;
  992                         estatus = IEEE80211_STATUS_CHALLENGE;
  993                         goto bad;
  994                 }
  995                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
  996                         challenge = frm;
  997                 frm += frm[1] + 2;
  998         }
  999         switch (seq) {
 1000         case IEEE80211_AUTH_SHARED_CHALLENGE:
 1001         case IEEE80211_AUTH_SHARED_RESPONSE:
 1002                 if (challenge == NULL) {
 1003                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1004                             ni->ni_macaddr, "shared key auth",
 1005                             "%s", "no challenge");
 1006                         vap->iv_stats.is_rx_bad_auth++;
 1007                         estatus = IEEE80211_STATUS_CHALLENGE;
 1008                         goto bad;
 1009                 }
 1010                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
 1011                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1012                             ni->ni_macaddr, "shared key auth",
 1013                             "bad challenge len %d", challenge[1]);
 1014                         vap->iv_stats.is_rx_bad_auth++;
 1015                         estatus = IEEE80211_STATUS_CHALLENGE;
 1016                         goto bad;
 1017                 }
 1018         default:
 1019                 break;
 1020         }
 1021         if (vap->iv_state != IEEE80211_S_AUTH)
 1022                 return;
 1023         switch (seq) {
 1024         case IEEE80211_AUTH_SHARED_PASS:
 1025                 if (ni->ni_challenge != NULL) {
 1026                         free(ni->ni_challenge, M_80211_NODE);
 1027                         ni->ni_challenge = NULL;
 1028                 }
 1029                 if (status != 0) {
 1030                         IEEE80211_NOTE_FRAME(vap,
 1031                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
 1032                             "shared key auth failed (reason %d)", status);
 1033                         vap->iv_stats.is_rx_auth_fail++;
 1034                         vap->iv_stats.is_rx_authfail_code = status;
 1035                         return;
 1036                 }
 1037                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 1038                 break;
 1039         case IEEE80211_AUTH_SHARED_CHALLENGE:
 1040                 if (!ieee80211_alloc_challenge(ni))
 1041                         return;
 1042                 /* XXX could optimize by passing recvd challenge */
 1043                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
 1044                 IEEE80211_SEND_MGMT(ni,
 1045                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 1046                 break;
 1047         default:
 1048                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
 1049                     wh, "shared key auth", "bad seq %d", seq);
 1050                 vap->iv_stats.is_rx_bad_auth++;
 1051                 return;
 1052         }
 1053         return;
 1054 bad:
 1055         /*
 1056          * Kick the state machine.  This short-circuits
 1057          * using the mgt frame timeout to trigger the
 1058          * state transition.
 1059          */
 1060         if (vap->iv_state == IEEE80211_S_AUTH)
 1061                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 1062                     IEEE80211_SCAN_FAIL_STATUS);
 1063 }
 1064 
 1065 static int
 1066 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
 1067         const struct ieee80211_frame *wh)
 1068 {
 1069 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
 1070         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
 1071         u_int len = frm[1], qosinfo;
 1072         int i;
 1073 
 1074         if (len < sizeof(struct ieee80211_wme_param)-2) {
 1075                 IEEE80211_DISCARD_IE(vap,
 1076                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
 1077                     wh, "WME", "too short, len %u", len);
 1078                 return -1;
 1079         }
 1080         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
 1081         qosinfo &= WME_QOSINFO_COUNT;
 1082         /* XXX do proper check for wraparound */
 1083         if (qosinfo == wme->wme_wmeChanParams.cap_info)
 1084                 return 0;
 1085         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
 1086         for (i = 0; i < WME_NUM_AC; i++) {
 1087                 struct wmeParams *wmep =
 1088                         &wme->wme_wmeChanParams.cap_wmeParams[i];
 1089                 /* NB: ACI not used */
 1090                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
 1091                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
 1092                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
 1093                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
 1094                 wmep->wmep_txopLimit = LE_READ_2(frm+2);
 1095                 frm += 4;
 1096         }
 1097         wme->wme_wmeChanParams.cap_info = qosinfo;
 1098         return 1;
 1099 #undef MS
 1100 }
 1101 
 1102 /*
 1103  * Process 11h Channel Switch Announcement (CSA) ie.  If this
 1104  * is the first CSA then initiate the switch.  Otherwise we
 1105  * track state and trigger completion and/or cancel of the switch.
 1106  * XXX should be public for IBSS use
 1107  */
 1108 static void
 1109 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
 1110         const struct ieee80211_frame *wh)
 1111 {
 1112         struct ieee80211com *ic = vap->iv_ic;
 1113         const struct ieee80211_csa_ie *csa =
 1114             (const struct ieee80211_csa_ie *) frm;
 1115 
 1116         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 1117             ("state %s", ieee80211_state_name[vap->iv_state]));
 1118 
 1119         if (csa->csa_mode > 1) {
 1120                 IEEE80211_DISCARD_IE(vap,
 1121                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
 1122                     wh, "CSA", "invalid mode %u", csa->csa_mode);
 1123                 return;
 1124         }
 1125         IEEE80211_LOCK(ic);
 1126         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
 1127                 /*
 1128                  * Convert the channel number to a channel reference.  We
 1129                  * try first to preserve turbo attribute of the current
 1130                  * channel then fallback.  Note this will not work if the
 1131                  * CSA specifies a channel that requires a band switch (e.g.
 1132                  * 11a => 11g).  This is intentional as 11h is defined only
 1133                  * for 5GHz/11a and because the switch does not involve a
 1134                  * reassociation, protocol state (capabilities, negotated
 1135                  * rates, etc) may/will be wrong.
 1136                  */
 1137                 struct ieee80211_channel *c =
 1138                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
 1139                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
 1140                 if (c == NULL) {
 1141                         c = ieee80211_find_channel_byieee(ic,
 1142                             csa->csa_newchan,
 1143                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
 1144                         if (c == NULL) {
 1145                                 IEEE80211_DISCARD_IE(vap,
 1146                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
 1147                                     wh, "CSA", "invalid channel %u",
 1148                                     csa->csa_newchan);
 1149                                 goto done;
 1150                         }
 1151                 }
 1152 #if IEEE80211_CSA_COUNT_MIN > 0
 1153                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
 1154                         /*
 1155                          * Require at least IEEE80211_CSA_COUNT_MIN count to
 1156                          * reduce the risk of being redirected by a fabricated
 1157                          * CSA.  If a valid CSA is dropped we'll still get a
 1158                          * beacon miss when the AP leaves the channel so we'll
 1159                          * eventually follow to the new channel.
 1160                          *
 1161                          * NOTE: this violates the 11h spec that states that
 1162                          * count may be any value and if 0 then a switch
 1163                          * should happen asap.
 1164                          */
 1165                         IEEE80211_DISCARD_IE(vap,
 1166                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
 1167                             wh, "CSA", "count %u too small, must be >= %u",
 1168                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
 1169                         goto done;
 1170                 }
 1171 #endif
 1172                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
 1173         } else {
 1174                 /*
 1175                  * Validate this ie against the initial CSA.  We require
 1176                  * mode and channel not change and the count must be
 1177                  * monotonically decreasing.  This may be pointless and
 1178                  * canceling the switch as a result may be too paranoid but
 1179                  * in the worst case if we drop out of CSA because of this
 1180                  * and the AP does move then we'll just end up taking a
 1181                  * beacon miss and scan to find the AP.
 1182                  *
 1183                  * XXX may want <= on count as we also process ProbeResp
 1184                  * frames and those may come in w/ the same count as the
 1185                  * previous beacon; but doing so leaves us open to a stuck
 1186                  * count until we add a dead-man timer
 1187                  */
 1188                 if (!(csa->csa_count < ic->ic_csa_count &&
 1189                       csa->csa_mode == ic->ic_csa_mode &&
 1190                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
 1191                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
 1192                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
 1193                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
 1194                             ic->ic_csa_newchan, ic->ic_csa_count,
 1195                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
 1196                         ieee80211_csa_cancelswitch(ic);
 1197                 } else {
 1198                         if (csa->csa_count <= 1)
 1199                                 ieee80211_csa_completeswitch(ic);
 1200                         else
 1201                                 ic->ic_csa_count = csa->csa_count;
 1202                 }
 1203         }
 1204 done:
 1205         IEEE80211_UNLOCK(ic);
 1206 }
 1207 
 1208 /*
 1209  * Return non-zero if a background scan may be continued:
 1210  * o bg scan is active
 1211  * o no channel switch is pending
 1212  * o there has not been any traffic recently
 1213  *
 1214  * Note we do not check if there is an administrative enable;
 1215  * this is only done to start the scan.  We assume that any
 1216  * change in state will be accompanied by a request to cancel
 1217  * active scans which will otherwise cause this test to fail.
 1218  */
 1219 static __inline int
 1220 contbgscan(struct ieee80211vap *vap)
 1221 {
 1222         struct ieee80211com *ic = vap->iv_ic;
 1223 
 1224         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
 1225             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
 1226             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
 1227             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
 1228 }
 1229 
 1230 /*
 1231  * Return non-zero if a backgrond scan may be started:
 1232  * o bg scanning is administratively enabled
 1233  * o no channel switch is pending
 1234  * o we are not boosted on a dynamic turbo channel
 1235  * o there has not been a scan recently
 1236  * o there has not been any traffic recently
 1237  */
 1238 static __inline int
 1239 startbgscan(struct ieee80211vap *vap)
 1240 {
 1241         struct ieee80211com *ic = vap->iv_ic;
 1242 
 1243         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
 1244             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
 1245 #ifdef IEEE80211_SUPPORT_SUPERG
 1246             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
 1247 #endif
 1248             time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
 1249             time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
 1250 }
 1251 
 1252 static void
 1253 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 1254         int subtype, int rssi, int nf)
 1255 {
 1256 #define ISPROBE(_st)    ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
 1257 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
 1258         struct ieee80211vap *vap = ni->ni_vap;
 1259         struct ieee80211com *ic = ni->ni_ic;
 1260         struct ieee80211_frame *wh;
 1261         uint8_t *frm, *efrm;
 1262         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
 1263         uint8_t rate;
 1264 
 1265         wh = mtod(m0, struct ieee80211_frame *);
 1266         frm = (uint8_t *)&wh[1];
 1267         efrm = mtod(m0, uint8_t *) + m0->m_len;
 1268         switch (subtype) {
 1269         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 1270         case IEEE80211_FC0_SUBTYPE_BEACON: {
 1271                 struct ieee80211_scanparams scan;
 1272                 /*
 1273                  * We process beacon/probe response frames:
 1274                  *    o when scanning, or
 1275                  *    o station mode when associated (to collect state
 1276                  *      updates such as 802.11g slot time)
 1277                  * Frames otherwise received are discarded.
 1278                  */ 
 1279                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
 1280                         vap->iv_stats.is_rx_mgtdiscard++;
 1281                         return;
 1282                 }
 1283                 /* XXX probe response in sta mode when !scanning? */
 1284                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 1285                         return;
 1286                 /*
 1287                  * Count frame now that we know it's to be processed.
 1288                  */
 1289                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 1290                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 1291                         IEEE80211_NODE_STAT(ni, rx_beacons);
 1292                 } else
 1293                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 1294                 /*
 1295                  * When operating in station mode, check for state updates.
 1296                  * Be careful to ignore beacons received while doing a
 1297                  * background scan.  We consider only 11g/WMM stuff right now.
 1298                  */
 1299                 if (ni->ni_associd != 0 &&
 1300                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
 1301                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
 1302                         /* record tsf of last beacon */
 1303                         memcpy(ni->ni_tstamp.data, scan.tstamp,
 1304                                 sizeof(ni->ni_tstamp));
 1305                         /* count beacon frame for s/w bmiss handling */
 1306                         vap->iv_swbmiss_count++;
 1307                         vap->iv_bmiss_count = 0;
 1308                         if (ni->ni_erp != scan.erp) {
 1309                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1310                                     wh->i_addr2,
 1311                                     "erp change: was 0x%x, now 0x%x",
 1312                                     ni->ni_erp, scan.erp);
 1313                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
 1314                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
 1315                                         ic->ic_flags |= IEEE80211_F_USEPROT;
 1316                                 else
 1317                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 1318                                 ni->ni_erp = scan.erp;
 1319                                 /* XXX statistic */
 1320                                 /* XXX driver notification */
 1321                         }
 1322                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
 1323                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1324                                     wh->i_addr2,
 1325                                     "capabilities change: was 0x%x, now 0x%x",
 1326                                     ni->ni_capinfo, scan.capinfo);
 1327                                 /*
 1328                                  * NB: we assume short preamble doesn't
 1329                                  *     change dynamically
 1330                                  */
 1331                                 ieee80211_set_shortslottime(ic,
 1332                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
 1333                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
 1334                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
 1335                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
 1336                                 /* XXX statistic */
 1337                         }
 1338                         if (scan.wme != NULL &&
 1339                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
 1340                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
 1341                                 ieee80211_wme_updateparams(vap);
 1342 #ifdef IEEE80211_SUPPORT_SUPERG
 1343                         if (scan.ath != NULL)
 1344                                 ieee80211_parse_athparams(ni, scan.ath, wh);
 1345 #endif
 1346                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 1347                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1348                                 ieee80211_ht_updateparams(ni,
 1349                                     scan.htcap, scan.htinfo);
 1350                                 /* XXX state changes? */
 1351                         }
 1352                         if (scan.tim != NULL) {
 1353                                 struct ieee80211_tim_ie *tim =
 1354                                     (struct ieee80211_tim_ie *) scan.tim;
 1355 #if 0
 1356                                 int aid = IEEE80211_AID(ni->ni_associd);
 1357                                 int ix = aid / NBBY;
 1358                                 int min = tim->tim_bitctl &~ 1;
 1359                                 int max = tim->tim_len + min - 4;
 1360                                 if ((tim->tim_bitctl&1) ||
 1361                                     (min <= ix && ix <= max &&
 1362                                      isset(tim->tim_bitmap - min, aid))) {
 1363                                         /* 
 1364                                          * XXX Do not let bg scan kick off
 1365                                          * we are expecting data.
 1366                                          */
 1367                                         ic->ic_lastdata = ticks;
 1368                                         ieee80211_sta_pwrsave(vap, 0);
 1369                                 }
 1370 #endif
 1371                                 ni->ni_dtim_count = tim->tim_count;
 1372                                 ni->ni_dtim_period = tim->tim_period;
 1373                         }
 1374                         if (scan.csa != NULL &&
 1375                             (vap->iv_flags & IEEE80211_F_DOTH))
 1376                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
 1377                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
 1378                                 /*
 1379                                  * No CSA ie or 11h disabled, but a channel
 1380                                  * switch is pending; drop out so we aren't
 1381                                  * stuck in CSA state.  If the AP really is
 1382                                  * moving we'll get a beacon miss and scan.
 1383                                  */
 1384                                 IEEE80211_LOCK(ic);
 1385                                 ieee80211_csa_cancelswitch(ic);
 1386                                 IEEE80211_UNLOCK(ic);
 1387                         }
 1388                         /*
 1389                          * If scanning, pass the info to the scan module.
 1390                          * Otherwise, check if it's the right time to do
 1391                          * a background scan.  Background scanning must
 1392                          * be enabled and we must not be operating in the
 1393                          * turbo phase of dynamic turbo mode.  Then,
 1394                          * it's been a while since the last background
 1395                          * scan and if no data frames have come through
 1396                          * recently, kick off a scan.  Note that this
 1397                          * is the mechanism by which a background scan
 1398                          * is started _and_ continued each time we
 1399                          * return on-channel to receive a beacon from
 1400                          * our ap.
 1401                          */
 1402                         if (ic->ic_flags & IEEE80211_F_SCAN) {
 1403                                 ieee80211_add_scan(vap, &scan, wh,
 1404                                         subtype, rssi, nf);
 1405                         } else if (contbgscan(vap)) {
 1406                                 ieee80211_bg_scan(vap, 0);
 1407                         } else if (startbgscan(vap)) {
 1408                                 vap->iv_stats.is_scan_bg++;
 1409 #if 0
 1410                                 /* wakeup if we are sleeing */
 1411                                 ieee80211_set_pwrsave(vap, 0);
 1412 #endif
 1413                                 ieee80211_bg_scan(vap, 0);
 1414                         }
 1415                         return;
 1416                 }
 1417                 /*
 1418                  * If scanning, just pass information to the scan module.
 1419                  */
 1420                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 1421                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 1422                                 /*
 1423                                  * Actively scanning a channel marked passive;
 1424                                  * send a probe request now that we know there
 1425                                  * is 802.11 traffic present.
 1426                                  *
 1427                                  * XXX check if the beacon we recv'd gives
 1428                                  * us what we need and suppress the probe req
 1429                                  */
 1430                                 ieee80211_probe_curchan(vap, 1);
 1431                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 1432                         }
 1433                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 1434                         return;
 1435                 }
 1436                 break;
 1437         }
 1438 
 1439         case IEEE80211_FC0_SUBTYPE_AUTH: {
 1440                 uint16_t algo, seq, status;
 1441                 /*
 1442                  * auth frame format
 1443                  *      [2] algorithm
 1444                  *      [2] sequence
 1445                  *      [2] status
 1446                  *      [tlv*] challenge
 1447                  */
 1448                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
 1449                 algo   = le16toh(*(uint16_t *)frm);
 1450                 seq    = le16toh(*(uint16_t *)(frm + 2));
 1451                 status = le16toh(*(uint16_t *)(frm + 4));
 1452                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
 1453                     "recv auth frame with algorithm %d seq %d", algo, seq);
 1454 
 1455                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
 1456                         IEEE80211_DISCARD(vap,
 1457                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
 1458                             wh, "auth", "%s", "TKIP countermeasures enabled");
 1459                         vap->iv_stats.is_rx_auth_countermeasures++;
 1460                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
 1461                                 ieee80211_send_error(ni, wh->i_addr2,
 1462                                         IEEE80211_FC0_SUBTYPE_AUTH,
 1463                                         IEEE80211_REASON_MIC_FAILURE);
 1464                         }
 1465                         return;
 1466                 }
 1467                 if (algo == IEEE80211_AUTH_ALG_SHARED)
 1468                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
 1469                             seq, status);
 1470                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
 1471                         sta_auth_open(ni, wh, rssi, nf, seq, status);
 1472                 else {
 1473                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1474                             wh, "auth", "unsupported alg %d", algo);
 1475                         vap->iv_stats.is_rx_auth_unsupported++;
 1476                         return;
 1477                 } 
 1478                 break;
 1479         }
 1480 
 1481         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 1482         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
 1483                 uint16_t capinfo, associd;
 1484                 uint16_t status;
 1485 
 1486                 if (vap->iv_state != IEEE80211_S_ASSOC) {
 1487                         vap->iv_stats.is_rx_mgtdiscard++;
 1488                         return;
 1489                 }
 1490 
 1491                 /*
 1492                  * asresp frame format
 1493                  *      [2] capability information
 1494                  *      [2] status
 1495                  *      [2] association ID
 1496                  *      [tlv] supported rates
 1497                  *      [tlv] extended supported rates
 1498                  *      [tlv] WME
 1499                  *      [tlv] HT capabilities
 1500                  *      [tlv] HT info
 1501                  */
 1502                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
 1503                 ni = vap->iv_bss;
 1504                 capinfo = le16toh(*(uint16_t *)frm);
 1505                 frm += 2;
 1506                 status = le16toh(*(uint16_t *)frm);
 1507                 frm += 2;
 1508                 if (status != 0) {
 1509                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1510                             wh->i_addr2, "%sassoc failed (reason %d)",
 1511                             ISREASSOC(subtype) ?  "re" : "", status);
 1512                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
 1513                         return;
 1514                 }
 1515                 associd = le16toh(*(uint16_t *)frm);
 1516                 frm += 2;
 1517 
 1518                 rates = xrates = wme = htcap = htinfo = NULL;
 1519                 while (efrm - frm > 1) {
 1520                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 1521                         switch (*frm) {
 1522                         case IEEE80211_ELEMID_RATES:
 1523                                 rates = frm;
 1524                                 break;
 1525                         case IEEE80211_ELEMID_XRATES:
 1526                                 xrates = frm;
 1527                                 break;
 1528                         case IEEE80211_ELEMID_HTCAP:
 1529                                 htcap = frm;
 1530                                 break;
 1531                         case IEEE80211_ELEMID_HTINFO:
 1532                                 htinfo = frm;
 1533                                 break;
 1534                         case IEEE80211_ELEMID_VENDOR:
 1535                                 if (iswmeoui(frm))
 1536                                         wme = frm;
 1537                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
 1538                                         /*
 1539                                          * Accept pre-draft HT ie's if the
 1540                                          * standard ones have not been seen.
 1541                                          */
 1542                                         if (ishtcapoui(frm)) {
 1543                                                 if (htcap == NULL)
 1544                                                         htcap = frm;
 1545                                         } else if (ishtinfooui(frm)) {
 1546                                                 if (htinfo == NULL)
 1547                                                         htcap = frm;
 1548                                         }
 1549                                 }
 1550                                 /* XXX Atheros OUI support */
 1551                                 break;
 1552                         }
 1553                         frm += frm[1] + 2;
 1554                 }
 1555 
 1556                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 1557                 if (xrates != NULL)
 1558                         IEEE80211_VERIFY_ELEMENT(xrates,
 1559                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 1560                 rate = ieee80211_setup_rates(ni, rates, xrates,
 1561                                 IEEE80211_F_JOIN |
 1562                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1563                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1564                 if (rate & IEEE80211_RATE_BASIC) {
 1565                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1566                             wh->i_addr2,
 1567                             "%sassoc failed (rate set mismatch)",
 1568                             ISREASSOC(subtype) ?  "re" : "");
 1569                         vap->iv_stats.is_rx_assoc_norate++;
 1570                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
 1571                             IEEE80211_SCAN_FAIL_STATUS);
 1572                         return;
 1573                 }
 1574 
 1575                 ni->ni_capinfo = capinfo;
 1576                 ni->ni_associd = associd;
 1577                 if (ni->ni_jointime == 0)
 1578                         ni->ni_jointime = time_uptime;
 1579                 if (wme != NULL &&
 1580                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
 1581                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1582                         ieee80211_wme_updateparams(vap);
 1583                 } else
 1584                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
 1585                 /*
 1586                  * Setup HT state according to the negotiation.
 1587                  *
 1588                  * NB: shouldn't need to check if HT use is enabled but some
 1589                  *     ap's send back HT ie's even when we don't indicate we
 1590                  *     are HT capable in our AssocReq.
 1591                  */
 1592                 if (htcap != NULL && htinfo != NULL &&
 1593                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1594                         ieee80211_ht_node_init(ni);
 1595                         ieee80211_ht_updateparams(ni, htcap, htinfo);
 1596                         ieee80211_setup_htrates(ni, htcap,
 1597                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
 1598                         ieee80211_setup_basic_htrates(ni, htinfo);
 1599                         ieee80211_node_setuptxparms(ni);
 1600                         ieee80211_ratectl_node_init(ni);
 1601                 } else {
 1602 #ifdef IEEE80211_SUPPORT_SUPERG
 1603                         if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_ATH))
 1604                                 ieee80211_ff_node_init(ni);
 1605 #endif
 1606                 }
 1607                 /*
 1608                  * Configure state now that we are associated.
 1609                  *
 1610                  * XXX may need different/additional driver callbacks?
 1611                  */
 1612                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
 1613                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
 1614                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
 1615                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
 1616                 } else {
 1617                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
 1618                         ic->ic_flags |= IEEE80211_F_USEBARKER;
 1619                 }
 1620                 ieee80211_set_shortslottime(ic,
 1621                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
 1622                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
 1623                 /*
 1624                  * Honor ERP protection.
 1625                  *
 1626                  * NB: ni_erp should zero for non-11g operation.
 1627                  */
 1628                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
 1629                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
 1630                         ic->ic_flags |= IEEE80211_F_USEPROT;
 1631                 else
 1632                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 1633                 IEEE80211_NOTE_MAC(vap,
 1634                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
 1635                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
 1636                     ISREASSOC(subtype) ? "re" : "",
 1637                     IEEE80211_NODE_AID(ni),
 1638                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
 1639                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
 1640                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
 1641                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
 1642                     ni->ni_flags & IEEE80211_NODE_HT ?
 1643                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
 1644                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
 1645                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
 1646                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
 1647                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
 1648                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
 1649                         ", fast-frames" : "",
 1650                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
 1651                         ", turbo" : ""
 1652                 );
 1653                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
 1654                 break;
 1655         }
 1656 
 1657         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
 1658                 uint16_t reason;
 1659 
 1660                 if (vap->iv_state == IEEE80211_S_SCAN) {
 1661                         vap->iv_stats.is_rx_mgtdiscard++;
 1662                         return;
 1663                 }
 1664                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
 1665                         /* NB: can happen when in promiscuous mode */
 1666                         vap->iv_stats.is_rx_mgtdiscard++;
 1667                         break;
 1668                 }
 1669 
 1670                 /*
 1671                  * deauth frame format
 1672                  *      [2] reason
 1673                  */
 1674                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
 1675                 reason = le16toh(*(uint16_t *)frm);
 1676 
 1677                 vap->iv_stats.is_rx_deauth++;
 1678                 vap->iv_stats.is_rx_deauth_code = reason;
 1679                 IEEE80211_NODE_STAT(ni, rx_deauth);
 1680 
 1681                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
 1682                     "recv deauthenticate (reason %d)", reason);
 1683                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
 1684                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
 1685                 break;
 1686         }
 1687 
 1688         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
 1689                 uint16_t reason;
 1690 
 1691                 if (vap->iv_state != IEEE80211_S_RUN &&
 1692                     vap->iv_state != IEEE80211_S_ASSOC &&
 1693                     vap->iv_state != IEEE80211_S_AUTH) {
 1694                         vap->iv_stats.is_rx_mgtdiscard++;
 1695                         return;
 1696                 }
 1697                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
 1698                         /* NB: can happen when in promiscuous mode */
 1699                         vap->iv_stats.is_rx_mgtdiscard++;
 1700                         break;
 1701                 }
 1702 
 1703                 /*
 1704                  * disassoc frame format
 1705                  *      [2] reason
 1706                  */
 1707                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
 1708                 reason = le16toh(*(uint16_t *)frm);
 1709 
 1710                 vap->iv_stats.is_rx_disassoc++;
 1711                 vap->iv_stats.is_rx_disassoc_code = reason;
 1712                 IEEE80211_NODE_STAT(ni, rx_disassoc);
 1713 
 1714                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 1715                     "recv disassociate (reason %d)", reason);
 1716                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 1717                 break;
 1718         }
 1719 
 1720         case IEEE80211_FC0_SUBTYPE_ACTION:
 1721                 if (vap->iv_state == IEEE80211_S_RUN) {
 1722                         if (ieee80211_parse_action(ni, m0) == 0)
 1723                                 ic->ic_recv_action(ni, wh, frm, efrm);
 1724                 } else
 1725                         vap->iv_stats.is_rx_mgtdiscard++;
 1726                 break;
 1727 
 1728         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 1729         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 1730         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 1731                 vap->iv_stats.is_rx_mgtdiscard++;
 1732                 return;
 1733         default:
 1734                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1735                      wh, "mgt", "subtype 0x%x not handled", subtype);
 1736                 vap->iv_stats.is_rx_badsubtype++;
 1737                 break;
 1738         }
 1739 #undef ISREASSOC
 1740 #undef ISPROBE
 1741 }
 1742 
 1743 static void
 1744 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
 1745 {
 1746 }

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