The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_sta.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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/11.0/sys/net80211/ieee80211_sta.c 300232 2016-05-19 21:08:33Z avos $");
   29 #endif
   30 
   31 /*
   32  * IEEE 802.11 Station mode support.
   33  */
   34 #include "opt_inet.h"
   35 #include "opt_wlan.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h> 
   39 #include <sys/mbuf.h>   
   40 #include <sys/malloc.h>
   41 #include <sys/kernel.h>
   42 
   43 #include <sys/socket.h>
   44 #include <sys/sockio.h>
   45 #include <sys/endian.h>
   46 #include <sys/errno.h>
   47 #include <sys/proc.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_media.h>
   52 #include <net/if_llc.h>
   53 #include <net/if_dl.h>
   54 #include <net/if_var.h>
   55 #include <net/ethernet.h>
   56 
   57 #include <net/bpf.h>
   58 
   59 #include <net80211/ieee80211_var.h>
   60 #include <net80211/ieee80211_sta.h>
   61 #include <net80211/ieee80211_input.h>
   62 #ifdef IEEE80211_SUPPORT_SUPERG
   63 #include <net80211/ieee80211_superg.h>
   64 #endif
   65 #include <net80211/ieee80211_ratectl.h>
   66 #include <net80211/ieee80211_sta.h>
   67 
   68 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
   69 
   70 static  void sta_vattach(struct ieee80211vap *);
   71 static  void sta_beacon_miss(struct ieee80211vap *);
   72 static  int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   73 static  int sta_input(struct ieee80211_node *, struct mbuf *,
   74             const struct ieee80211_rx_stats *, int, int);
   75 static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
   76             int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
   77 static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
   78 
   79 void
   80 ieee80211_sta_attach(struct ieee80211com *ic)
   81 {
   82         ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
   83 }
   84 
   85 void
   86 ieee80211_sta_detach(struct ieee80211com *ic)
   87 {
   88 }
   89 
   90 static void
   91 sta_vdetach(struct ieee80211vap *vap)
   92 {
   93 }
   94 
   95 static void
   96 sta_vattach(struct ieee80211vap *vap)
   97 {
   98         vap->iv_newstate = sta_newstate;
   99         vap->iv_input = sta_input;
  100         vap->iv_recv_mgmt = sta_recv_mgmt;
  101         vap->iv_recv_ctl = sta_recv_ctl;
  102         vap->iv_opdetach = sta_vdetach;
  103         vap->iv_bmiss = sta_beacon_miss;
  104 }
  105 
  106 /*
  107  * Handle a beacon miss event.  The common code filters out
  108  * spurious events that can happen when scanning and/or before
  109  * reaching RUN state.
  110  */
  111 static void
  112 sta_beacon_miss(struct ieee80211vap *vap)
  113 {
  114         struct ieee80211com *ic = vap->iv_ic;
  115 
  116         IEEE80211_LOCK_ASSERT(ic);
  117 
  118         KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
  119         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
  120             ("wrong state %s", ieee80211_state_name[vap->iv_state]));
  121 
  122         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
  123             "beacon miss, mode %s state %s\n",
  124             ieee80211_opmode_name[vap->iv_opmode],
  125             ieee80211_state_name[vap->iv_state]);
  126 
  127         if (vap->iv_state == IEEE80211_S_CSA) {
  128                 /*
  129                  * A Channel Switch is pending; assume we missed the
  130                  * beacon that would've completed the process and just
  131                  * force the switch.  If we made a mistake we'll not
  132                  * find the AP on the new channel and fall back to a
  133                  * normal scan.
  134                  */
  135                 ieee80211_csa_completeswitch(ic);
  136                 return;
  137         }
  138         if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
  139                 /*
  140                  * Send a directed probe req before falling back to a
  141                  * scan; if we receive a response ic_bmiss_count will
  142                  * be reset.  Some cards mistakenly report beacon miss
  143                  * so this avoids the expensive scan if the ap is
  144                  * still there.
  145                  */
  146                 ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
  147                         vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
  148                         vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
  149                 return;
  150         }
  151 
  152         callout_stop(&vap->iv_swbmiss);
  153         vap->iv_bmiss_count = 0;
  154         vap->iv_stats.is_beacon_miss++;
  155         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
  156 #ifdef IEEE80211_SUPPORT_SUPERG
  157 
  158                 /*
  159                  * If we receive a beacon miss interrupt when using
  160                  * dynamic turbo, attempt to switch modes before
  161                  * reassociating.
  162                  */
  163                 if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
  164                         ieee80211_dturbo_switch(vap,
  165                             ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
  166 #endif
  167                 /*
  168                  * Try to reassociate before scanning for a new ap.
  169                  */
  170                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
  171         } else {
  172                 /*
  173                  * Somebody else is controlling state changes (e.g.
  174                  * a user-mode app) don't do anything that would
  175                  * confuse them; just drop into scan mode so they'll
  176                  * notified of the state change and given control.
  177                  */
  178                 ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
  179         }
  180 }
  181 
  182 /*
  183  * Handle deauth with reason.  We retry only for
  184  * the cases where we might succeed.  Otherwise
  185  * we downgrade the ap and scan.
  186  */
  187 static void
  188 sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
  189 {
  190         switch (reason) {
  191         case IEEE80211_STATUS_SUCCESS:          /* NB: MLME assoc */
  192         case IEEE80211_STATUS_TIMEOUT:
  193         case IEEE80211_REASON_ASSOC_EXPIRE:
  194         case IEEE80211_REASON_NOT_AUTHED:
  195         case IEEE80211_REASON_NOT_ASSOCED:
  196         case IEEE80211_REASON_ASSOC_LEAVE:
  197         case IEEE80211_REASON_ASSOC_NOT_AUTHED:
  198                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
  199                 break;
  200         default:
  201                 ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
  202                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
  203                         ieee80211_check_scan_current(vap);
  204                 break;
  205         }
  206 }
  207 
  208 static void
  209 sta_swbmiss_start(struct ieee80211vap *vap)
  210 {
  211 
  212         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
  213                 /*
  214                  * Start s/w beacon miss timer for devices w/o
  215                  * hardware support.  We fudge a bit here since
  216                  * we're doing this in software.
  217                  */
  218                 vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
  219                     2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
  220                 vap->iv_swbmiss_count = 0;
  221                 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
  222                     ieee80211_swbmiss, vap);
  223         }
  224 }
  225 
  226 /*
  227  * IEEE80211_M_STA vap state machine handler.
  228  * This routine handles the main states in the 802.11 protocol.
  229  */
  230 static int
  231 sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  232 {
  233         struct ieee80211com *ic = vap->iv_ic;
  234         struct ieee80211_node *ni;
  235         enum ieee80211_state ostate;
  236 
  237         IEEE80211_LOCK_ASSERT(ic);
  238 
  239         ostate = vap->iv_state;
  240         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  241             __func__, ieee80211_state_name[ostate],
  242             ieee80211_state_name[nstate], arg);
  243         vap->iv_state = nstate;                 /* state transition */
  244         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
  245         if (ostate != IEEE80211_S_SCAN)
  246                 ieee80211_cancel_scan(vap);     /* background scan */
  247         ni = vap->iv_bss;                       /* NB: no reference held */
  248         if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
  249                 callout_stop(&vap->iv_swbmiss);
  250         switch (nstate) {
  251         case IEEE80211_S_INIT:
  252                 switch (ostate) {
  253                 case IEEE80211_S_SLEEP:
  254                         /* XXX wakeup */
  255                         /* XXX driver hook to wakeup the hardware? */
  256                 case IEEE80211_S_RUN:
  257                         IEEE80211_SEND_MGMT(ni,
  258                             IEEE80211_FC0_SUBTYPE_DISASSOC,
  259                             IEEE80211_REASON_ASSOC_LEAVE);
  260                         ieee80211_sta_leave(ni);
  261                         break;
  262                 case IEEE80211_S_ASSOC:
  263                         IEEE80211_SEND_MGMT(ni,
  264                             IEEE80211_FC0_SUBTYPE_DEAUTH,
  265                             IEEE80211_REASON_AUTH_LEAVE);
  266                         break;
  267                 case IEEE80211_S_SCAN:
  268                         ieee80211_cancel_scan(vap);
  269                         break;
  270                 default:
  271                         break;
  272                 }
  273                 if (ostate != IEEE80211_S_INIT) {
  274                         /* NB: optimize INIT -> INIT case */
  275                         ieee80211_reset_bss(vap);
  276                 }
  277                 if (vap->iv_auth->ia_detach != NULL)
  278                         vap->iv_auth->ia_detach(vap);
  279                 break;
  280         case IEEE80211_S_SCAN:
  281                 switch (ostate) {
  282                 case IEEE80211_S_INIT:
  283                         /*
  284                          * Initiate a scan.  We can come here as a result
  285                          * of an IEEE80211_IOC_SCAN_REQ too in which case
  286                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
  287                          * and the scan request parameters will be present
  288                          * in iv_scanreq.  Otherwise we do the default.
  289                          */
  290                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
  291                                 ieee80211_check_scan(vap,
  292                                     vap->iv_scanreq_flags,
  293                                     vap->iv_scanreq_duration,
  294                                     vap->iv_scanreq_mindwell,
  295                                     vap->iv_scanreq_maxdwell,
  296                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
  297                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
  298                         } else
  299                                 ieee80211_check_scan_current(vap);
  300                         break;
  301                 case IEEE80211_S_SCAN:
  302                 case IEEE80211_S_AUTH:
  303                 case IEEE80211_S_ASSOC:
  304                         /*
  305                          * These can happen either because of a timeout
  306                          * on an assoc/auth response or because of a
  307                          * change in state that requires a reset.  For
  308                          * the former we're called with a non-zero arg
  309                          * that is the cause for the failure; pass this
  310                          * to the scan code so it can update state.
  311                          * Otherwise trigger a new scan unless we're in
  312                          * manual roaming mode in which case an application
  313                          * must issue an explicit scan request.
  314                          */
  315                         if (arg != 0)
  316                                 ieee80211_scan_assoc_fail(vap,
  317                                         vap->iv_bss->ni_macaddr, arg);
  318                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
  319                                 ieee80211_check_scan_current(vap);
  320                         break;
  321                 case IEEE80211_S_SLEEP:         /* beacon miss */
  322                         /*
  323                          * XXX if in sleep we need to wakeup the hardware.
  324                          */
  325                         /* FALLTHROUGH */
  326                 case IEEE80211_S_RUN:           /* beacon miss */
  327                         /*
  328                          * Beacon miss.  Notify user space and if not
  329                          * under control of a user application (roaming
  330                          * manual) kick off a scan to re-connect.
  331                          */
  332 
  333                         ieee80211_sta_leave(ni);
  334                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
  335                                 ieee80211_check_scan_current(vap);
  336                         break;
  337                 default:
  338                         goto invalid;
  339                 }
  340                 break;
  341         case IEEE80211_S_AUTH:
  342                 switch (ostate) {
  343                 case IEEE80211_S_INIT:
  344                 case IEEE80211_S_SCAN:
  345                         IEEE80211_SEND_MGMT(ni,
  346                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
  347                         break;
  348                 case IEEE80211_S_AUTH:
  349                 case IEEE80211_S_ASSOC:
  350                         switch (arg & 0xff) {
  351                         case IEEE80211_FC0_SUBTYPE_AUTH:
  352                                 /* ??? */
  353                                 IEEE80211_SEND_MGMT(ni,
  354                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
  355                                 break;
  356                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
  357                                 sta_authretry(vap, ni, arg>>8);
  358                                 break;
  359                         }
  360                         break;
  361                 case IEEE80211_S_SLEEP:
  362                 case IEEE80211_S_RUN:
  363                         switch (arg & 0xff) {
  364                         case IEEE80211_FC0_SUBTYPE_AUTH:
  365                                 IEEE80211_SEND_MGMT(ni,
  366                                     IEEE80211_FC0_SUBTYPE_AUTH, 2);
  367                                 vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
  368                                 break;
  369                         case IEEE80211_FC0_SUBTYPE_DEAUTH:
  370                                 ieee80211_sta_leave(ni);
  371                                 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
  372                                         /* try to reauth */
  373                                         IEEE80211_SEND_MGMT(ni,
  374                                             IEEE80211_FC0_SUBTYPE_AUTH, 1);
  375                                 }
  376                                 break;
  377                         }
  378                         break;
  379                 default:
  380                         goto invalid;
  381                 }
  382                 break;
  383         case IEEE80211_S_ASSOC:
  384                 switch (ostate) {
  385                 case IEEE80211_S_AUTH:
  386                 case IEEE80211_S_ASSOC:
  387                         IEEE80211_SEND_MGMT(ni,
  388                             IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
  389                         break;
  390                 case IEEE80211_S_SLEEP:         /* cannot happen */
  391                 case IEEE80211_S_RUN:
  392                         ieee80211_sta_leave(ni);
  393                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
  394                                 IEEE80211_SEND_MGMT(ni, arg ?
  395                                     IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
  396                                     IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
  397                         }
  398                         break;
  399                 default:
  400                         goto invalid;
  401                 }
  402                 break;
  403         case IEEE80211_S_RUN:
  404                 if (vap->iv_flags & IEEE80211_F_WPA) {
  405                         /* XXX validate prerequisites */
  406                 }
  407                 switch (ostate) {
  408                 case IEEE80211_S_RUN:
  409                 case IEEE80211_S_CSA:
  410                         break;
  411                 case IEEE80211_S_AUTH:          /* when join is done in fw */
  412                 case IEEE80211_S_ASSOC:
  413 #ifdef IEEE80211_DEBUG
  414                         if (ieee80211_msg_debug(vap)) {
  415                                 ieee80211_note(vap, "%s with %s ssid ",
  416                                     (vap->iv_opmode == IEEE80211_M_STA ?
  417                                     "associated" : "synchronized"),
  418                                     ether_sprintf(ni->ni_bssid));
  419                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
  420                                     ni->ni_esslen);
  421                                 /* XXX MCS/HT */
  422                                 printf(" channel %d start %uMb\n",
  423                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
  424                                     IEEE80211_RATE2MBS(ni->ni_txrate));
  425                         }
  426 #endif
  427                         ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
  428                         ieee80211_notify_node_join(ni, 
  429                             arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
  430                         break;
  431                 case IEEE80211_S_SLEEP:
  432                         /* Wake up from sleep */
  433                         vap->iv_sta_ps(vap, 0);
  434                         break;
  435                 default:
  436                         goto invalid;
  437                 }
  438                 ieee80211_sync_curchan(ic);
  439                 if (ostate != IEEE80211_S_RUN)
  440                         sta_swbmiss_start(vap);
  441                 /*
  442                  * When 802.1x is not in use mark the port authorized
  443                  * at this point so traffic can flow.
  444                  */
  445                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
  446                         ieee80211_node_authorize(ni);
  447                 /*
  448                  * Fake association when joining an existing bss.
  449                  *
  450                  * Don't do this if we're doing SLEEP->RUN.
  451                  */
  452                 if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
  453                         ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
  454                 break;
  455         case IEEE80211_S_CSA:
  456                 if (ostate != IEEE80211_S_RUN)
  457                         goto invalid;
  458                 break;
  459         case IEEE80211_S_SLEEP:
  460                 sta_swbmiss_start(vap);
  461                 vap->iv_sta_ps(vap, 1);
  462                 break;
  463         default:
  464         invalid:
  465                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  466                     "%s: unexpected state transition %s -> %s\n", __func__,
  467                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
  468                 break;
  469         }
  470         return 0;
  471 }
  472 
  473 /*
  474  * Return non-zero if the frame is an echo of a multicast
  475  * frame sent by ourself.  The dir is known to be DSTODS.
  476  */
  477 static __inline int
  478 isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
  479 {
  480 #define QWH4(wh)        ((const struct ieee80211_qosframe_addr4 *)wh)
  481 #define WH4(wh)         ((const struct ieee80211_frame_addr4 *)wh)
  482         const uint8_t *sa;
  483 
  484         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
  485 
  486         if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
  487                 return 0;
  488         sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
  489         return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
  490 #undef WH4
  491 #undef QWH4
  492 }
  493 
  494 /*
  495  * Return non-zero if the frame is an echo of a multicast
  496  * frame sent by ourself.  The dir is known to be FROMDS.
  497  */
  498 static __inline int
  499 isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
  500 {
  501         KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
  502 
  503         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
  504                 return 0;
  505         return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
  506 }
  507 
  508 /*
  509  * Decide if a received management frame should be
  510  * printed when debugging is enabled.  This filters some
  511  * of the less interesting frames that come frequently
  512  * (e.g. beacons).
  513  */
  514 static __inline int
  515 doprint(struct ieee80211vap *vap, int subtype)
  516 {
  517         switch (subtype) {
  518         case IEEE80211_FC0_SUBTYPE_BEACON:
  519                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
  520         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  521                 return 0;
  522         }
  523         return 1;
  524 }
  525 
  526 /*
  527  * Process a received frame.  The node associated with the sender
  528  * should be supplied.  If nothing was found in the node table then
  529  * the caller is assumed to supply a reference to iv_bss instead.
  530  * The RSSI and a timestamp are also supplied.  The RSSI data is used
  531  * during AP scanning to select a AP to associate with; it can have
  532  * any units so long as values have consistent units and higher values
  533  * mean ``better signal''.  The receive timestamp is currently not used
  534  * by the 802.11 layer.
  535  */
  536 static int
  537 sta_input(struct ieee80211_node *ni, struct mbuf *m,
  538     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
  539 {
  540         struct ieee80211vap *vap = ni->ni_vap;
  541         struct ieee80211com *ic = ni->ni_ic;
  542         struct ifnet *ifp = vap->iv_ifp;
  543         struct ieee80211_frame *wh;
  544         struct ieee80211_key *key;
  545         struct ether_header *eh;
  546         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
  547         uint8_t dir, type, subtype, qos;
  548         uint8_t *bssid;
  549 
  550         if (m->m_flags & M_AMPDU_MPDU) {
  551                 /*
  552                  * Fastpath for A-MPDU reorder q resubmission.  Frames
  553                  * w/ M_AMPDU_MPDU marked have already passed through
  554                  * here but were received out of order and been held on
  555                  * the reorder queue.  When resubmitted they are marked
  556                  * with the M_AMPDU_MPDU flag and we can bypass most of
  557                  * the normal processing.
  558                  */
  559                 wh = mtod(m, struct ieee80211_frame *);
  560                 type = IEEE80211_FC0_TYPE_DATA;
  561                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  562                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
  563                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
  564                 goto resubmit_ampdu;
  565         }
  566 
  567         KASSERT(ni != NULL, ("null node"));
  568         ni->ni_inact = ni->ni_inact_reload;
  569 
  570         type = -1;                      /* undefined */
  571 
  572         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
  573                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  574                     ni->ni_macaddr, NULL,
  575                     "too short (1): len %u", m->m_pkthdr.len);
  576                 vap->iv_stats.is_rx_tooshort++;
  577                 goto out;
  578         }
  579         /*
  580          * Bit of a cheat here, we use a pointer for a 3-address
  581          * frame format but don't reference fields past outside
  582          * ieee80211_frame_min w/o first validating the data is
  583          * present.
  584          */
  585         wh = mtod(m, struct ieee80211_frame *);
  586 
  587         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  588             IEEE80211_FC0_VERSION_0) {
  589                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  590                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
  591                     wh->i_fc[0], wh->i_fc[1]);
  592                 vap->iv_stats.is_rx_badversion++;
  593                 goto err;
  594         }
  595 
  596         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  597         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  598         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  599         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
  600                 bssid = wh->i_addr2;
  601                 if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
  602                         /* not interested in */
  603                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  604                             bssid, NULL, "%s", "not to bss");
  605                         vap->iv_stats.is_rx_wrongbss++;
  606                         goto out;
  607                 }
  608 
  609                 /*
  610                  * Some devices may be in a promiscuous mode
  611                  * where they receive frames for multiple station
  612                  * addresses.
  613                  *
  614                  * If we receive a data frame that isn't
  615                  * destined to our VAP MAC, drop it.
  616                  *
  617                  * XXX TODO: This is only enforced when not scanning;
  618                  * XXX it assumes a software-driven scan will put the NIC
  619                  * XXX into a "no data frames" mode before setting this
  620                  * XXX flag. Otherwise it may be possible that we'll still
  621                  * XXX process data frames whilst scanning.
  622                  */
  623                 if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
  624                     && (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
  625                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  626                             bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
  627                             IF_LLADDR(ifp), ":", wh->i_addr1, ":");
  628                         vap->iv_stats.is_rx_wrongbss++;
  629                         goto out;
  630                 }
  631 
  632                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  633                 ni->ni_noise = nf;
  634                 if ( IEEE80211_HAS_SEQ(type, subtype) &&
  635                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  636                         uint8_t tid = ieee80211_gettid(wh);
  637                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
  638                             TID_TO_WME_AC(tid) >= WME_AC_VI)
  639                                 ic->ic_wme.wme_hipri_traffic++;
  640                         if (! ieee80211_check_rxseq(ni, wh, bssid))
  641                                 goto out;
  642                 }
  643         }
  644 
  645         switch (type) {
  646         case IEEE80211_FC0_TYPE_DATA:
  647                 hdrspace = ieee80211_hdrspace(ic, wh);
  648                 if (m->m_len < hdrspace &&
  649                     (m = m_pullup(m, hdrspace)) == NULL) {
  650                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  651                             ni->ni_macaddr, NULL,
  652                             "data too short: expecting %u", hdrspace);
  653                         vap->iv_stats.is_rx_tooshort++;
  654                         goto out;               /* XXX */
  655                 }
  656                 /*
  657                  * Handle A-MPDU re-ordering.  If the frame is to be
  658                  * processed directly then ieee80211_ampdu_reorder
  659                  * will return 0; otherwise it has consumed the mbuf
  660                  * and we should do nothing more with it.
  661                  */
  662                 if ((m->m_flags & M_AMPDU) &&
  663                     (dir == IEEE80211_FC1_DIR_FROMDS ||
  664                      dir == IEEE80211_FC1_DIR_DSTODS) &&
  665                     ieee80211_ampdu_reorder(ni, m) != 0) {
  666                         m = NULL;
  667                         goto out;
  668                 }
  669         resubmit_ampdu:
  670                 if (dir == IEEE80211_FC1_DIR_FROMDS) {
  671                         if ((ifp->if_flags & IFF_SIMPLEX) &&
  672                             isfromds_mcastecho(vap, wh)) {
  673                                 /*
  674                                  * In IEEE802.11 network, multicast
  675                                  * packets sent from "me" are broadcast
  676                                  * from the AP; silently discard for
  677                                  * SIMPLEX interface.
  678                                  */
  679                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  680                                     wh, "data", "%s", "multicast echo");
  681                                 vap->iv_stats.is_rx_mcastecho++;
  682                                 goto out;
  683                         }
  684                         if ((vap->iv_flags & IEEE80211_F_DWDS) &&
  685                             IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  686                                 /*
  687                                  * DWDS sta's must drop 3-address mcast frames
  688                                  * as they will be sent separately as a 4-addr
  689                                  * frame.  Accepting the 3-addr frame will
  690                                  * confuse the bridge into thinking the sending
  691                                  * sta is located at the end of WDS link.
  692                                  */
  693                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
  694                                     "3-address data", "%s", "DWDS enabled");
  695                                 vap->iv_stats.is_rx_mcastecho++;
  696                                 goto out;
  697                         }
  698                 } else if (dir == IEEE80211_FC1_DIR_DSTODS) {
  699                         if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
  700                                 IEEE80211_DISCARD(vap,
  701                                     IEEE80211_MSG_INPUT, wh, "4-address data",
  702                                     "%s", "DWDS not enabled");
  703                                 vap->iv_stats.is_rx_wrongdir++;
  704                                 goto out;
  705                         }
  706                         if ((ifp->if_flags & IFF_SIMPLEX) &&
  707                             isdstods_mcastecho(vap, wh)) {
  708                                 /*
  709                                  * In IEEE802.11 network, multicast
  710                                  * packets sent from "me" are broadcast
  711                                  * from the AP; silently discard for
  712                                  * SIMPLEX interface.
  713                                  */
  714                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
  715                                     "4-address data", "%s", "multicast echo");
  716                                 vap->iv_stats.is_rx_mcastecho++;
  717                                 goto out;
  718                         }
  719                 } else {
  720                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
  721                             "data", "incorrect dir 0x%x", dir);
  722                         vap->iv_stats.is_rx_wrongdir++;
  723                         goto out;
  724                 }
  725 
  726                 /*
  727                  * Handle privacy requirements.  Note that we
  728                  * must not be preempted from here until after
  729                  * we (potentially) call ieee80211_crypto_demic;
  730                  * otherwise we may violate assumptions in the
  731                  * crypto cipher modules used to do delayed update
  732                  * of replay sequence numbers.
  733                  */
  734                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
  735                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  736                                 /*
  737                                  * Discard encrypted frames when privacy is off.
  738                                  */
  739                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  740                                     wh, "WEP", "%s", "PRIVACY off");
  741                                 vap->iv_stats.is_rx_noprivacy++;
  742                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
  743                                 goto out;
  744                         }
  745                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  746                         if (key == NULL) {
  747                                 /* NB: stats+msgs handled in crypto_decap */
  748                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
  749                                 goto out;
  750                         }
  751                         wh = mtod(m, struct ieee80211_frame *);
  752                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
  753                 } else {
  754                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
  755                         key = NULL;
  756                 }
  757 
  758                 /*
  759                  * Save QoS bits for use below--before we strip the header.
  760                  */
  761                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
  762                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
  763                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
  764                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
  765                 } else
  766                         qos = 0;
  767 
  768                 /*
  769                  * Next up, any fragmentation.
  770                  */
  771                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  772                         m = ieee80211_defrag(ni, m, hdrspace);
  773                         if (m == NULL) {
  774                                 /* Fragment dropped or frame not complete yet */
  775                                 goto out;
  776                         }
  777                 }
  778                 wh = NULL;              /* no longer valid, catch any uses */
  779 
  780                 /*
  781                  * Next strip any MSDU crypto bits.
  782                  */
  783                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
  784                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  785                             ni->ni_macaddr, "data", "%s", "demic error");
  786                         vap->iv_stats.is_rx_demicfail++;
  787                         IEEE80211_NODE_STAT(ni, rx_demicfail);
  788                         goto out;
  789                 }
  790 
  791                 /* copy to listener after decrypt */
  792                 if (ieee80211_radiotap_active_vap(vap))
  793                         ieee80211_radiotap_rx(vap, m);
  794                 need_tap = 0;
  795 
  796                 /*
  797                  * Finally, strip the 802.11 header.
  798                  */
  799                 m = ieee80211_decap(vap, m, hdrspace);
  800                 if (m == NULL) {
  801                         /* XXX mask bit to check for both */
  802                         /* don't count Null data frames as errors */
  803                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
  804                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
  805                                 goto out;
  806                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  807                             ni->ni_macaddr, "data", "%s", "decap error");
  808                         vap->iv_stats.is_rx_decap++;
  809                         IEEE80211_NODE_STAT(ni, rx_decap);
  810                         goto err;
  811                 }
  812                 eh = mtod(m, struct ether_header *);
  813                 if (!ieee80211_node_is_authorized(ni)) {
  814                         /*
  815                          * Deny any non-PAE frames received prior to
  816                          * authorization.  For open/shared-key
  817                          * authentication the port is mark authorized
  818                          * after authentication completes.  For 802.1x
  819                          * the port is not marked authorized by the
  820                          * authenticator until the handshake has completed.
  821                          */
  822                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
  823                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  824                                     eh->ether_shost, "data",
  825                                     "unauthorized port: ether type 0x%x len %u",
  826                                     eh->ether_type, m->m_pkthdr.len);
  827                                 vap->iv_stats.is_rx_unauth++;
  828                                 IEEE80211_NODE_STAT(ni, rx_unauth);
  829                                 goto err;
  830                         }
  831                 } else {
  832                         /*
  833                          * When denying unencrypted frames, discard
  834                          * any non-PAE frames received without encryption.
  835                          */
  836                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
  837                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
  838                             eh->ether_type != htons(ETHERTYPE_PAE)) {
  839                                 /*
  840                                  * Drop unencrypted frames.
  841                                  */
  842                                 vap->iv_stats.is_rx_unencrypted++;
  843                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
  844                                 goto out;
  845                         }
  846                 }
  847                 /* XXX require HT? */
  848                 if (qos & IEEE80211_QOS_AMSDU) {
  849                         m = ieee80211_decap_amsdu(ni, m);
  850                         if (m == NULL)
  851                                 return IEEE80211_FC0_TYPE_DATA;
  852                 } else {
  853 #ifdef IEEE80211_SUPPORT_SUPERG
  854                         m = ieee80211_decap_fastframe(vap, ni, m);
  855                         if (m == NULL)
  856                                 return IEEE80211_FC0_TYPE_DATA;
  857 #endif
  858                 }
  859                 ieee80211_deliver_data(vap, ni, m);
  860                 return IEEE80211_FC0_TYPE_DATA;
  861 
  862         case IEEE80211_FC0_TYPE_MGT:
  863                 vap->iv_stats.is_rx_mgmt++;
  864                 IEEE80211_NODE_STAT(ni, rx_mgmt);
  865                 if (dir != IEEE80211_FC1_DIR_NODS) {
  866                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  867                             wh, "data", "incorrect dir 0x%x", dir);
  868                         vap->iv_stats.is_rx_wrongdir++;
  869                         goto err;
  870                 }
  871                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  872                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  873                             ni->ni_macaddr, "mgt", "too short: len %u",
  874                             m->m_pkthdr.len);
  875                         vap->iv_stats.is_rx_tooshort++;
  876                         goto out;
  877                 }
  878 #ifdef IEEE80211_DEBUG
  879                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
  880                     ieee80211_msg_dumppkts(vap)) {
  881                         if_printf(ifp, "received %s from %s rssi %d\n",
  882                             ieee80211_mgt_subtype_name(subtype),
  883                             ether_sprintf(wh->i_addr2), rssi);
  884                 }
  885 #endif
  886                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
  887                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
  888                                 /*
  889                                  * Only shared key auth frames with a challenge
  890                                  * should be encrypted, discard all others.
  891                                  */
  892                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  893                                     wh, ieee80211_mgt_subtype_name(subtype),
  894                                     "%s", "WEP set but not permitted");
  895                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
  896                                 goto out;
  897                         }
  898                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  899                                 /*
  900                                  * Discard encrypted frames when privacy is off.
  901                                  */
  902                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  903                                     wh, "mgt", "%s", "WEP set but PRIVACY off");
  904                                 vap->iv_stats.is_rx_noprivacy++;
  905                                 goto out;
  906                         }
  907                         hdrspace = ieee80211_hdrspace(ic, wh);
  908                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  909                         if (key == NULL) {
  910                                 /* NB: stats+msgs handled in crypto_decap */
  911                                 goto out;
  912                         }
  913                         wh = mtod(m, struct ieee80211_frame *);
  914                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
  915                 }
  916                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
  917                 goto out;
  918 
  919         case IEEE80211_FC0_TYPE_CTL:
  920                 vap->iv_stats.is_rx_ctl++;
  921                 IEEE80211_NODE_STAT(ni, rx_ctrl);
  922                 vap->iv_recv_ctl(ni, m, subtype);
  923                 goto out;
  924 
  925         default:
  926                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  927                     wh, NULL, "bad frame type 0x%x", type);
  928                 /* should not come here */
  929                 break;
  930         }
  931 err:
  932         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
  933 out:
  934         if (m != NULL) {
  935                 if (need_tap && ieee80211_radiotap_active_vap(vap))
  936                         ieee80211_radiotap_rx(vap, m);
  937                 m_freem(m);
  938         }
  939         return type;
  940 }
  941 
  942 static void
  943 sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
  944     int rssi, int nf, uint16_t seq, uint16_t status)
  945 {
  946         struct ieee80211vap *vap = ni->ni_vap;
  947 
  948         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
  949                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
  950                     ni->ni_macaddr, "open auth",
  951                     "bad sta auth mode %u", ni->ni_authmode);
  952                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
  953                 return;
  954         }
  955         if (vap->iv_state != IEEE80211_S_AUTH ||
  956             seq != IEEE80211_AUTH_OPEN_RESPONSE) {
  957                 vap->iv_stats.is_rx_bad_auth++;
  958                 return;
  959         }
  960         if (status != 0) {
  961                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
  962                     ni, "open auth failed (reason %d)", status);
  963                 vap->iv_stats.is_rx_auth_fail++;
  964                 vap->iv_stats.is_rx_authfail_code = status;
  965                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
  966                     IEEE80211_SCAN_FAIL_STATUS);
  967         } else
  968                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
  969 }
  970 
  971 static void
  972 sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
  973     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
  974     uint16_t seq, uint16_t status)
  975 {
  976         struct ieee80211vap *vap = ni->ni_vap;
  977         uint8_t *challenge;
  978 
  979         /*
  980          * NB: this can happen as we allow pre-shared key
  981          * authentication to be enabled w/o wep being turned
  982          * on so that configuration of these can be done
  983          * in any order.  It may be better to enforce the
  984          * ordering in which case this check would just be
  985          * for sanity/consistency.
  986          */
  987         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  988                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
  989                     ni->ni_macaddr, "shared key auth",
  990                     "%s", " PRIVACY is disabled");
  991                 goto bad;
  992         }
  993         /*
  994          * Pre-shared key authentication is evil; accept
  995          * it only if explicitly configured (it is supported
  996          * mainly for compatibility with clients like OS X).
  997          */
  998         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
  999             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
 1000                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1001                     ni->ni_macaddr, "shared key auth",
 1002                     "bad sta auth mode %u", ni->ni_authmode);
 1003                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
 1004                 goto bad;
 1005         }
 1006 
 1007         challenge = NULL;
 1008         if (frm + 1 < efrm) {
 1009                 if ((frm[1] + 2) > (efrm - frm)) {
 1010                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1011                             ni->ni_macaddr, "shared key auth",
 1012                             "ie %d/%d too long",
 1013                             frm[0], (frm[1] + 2) - (efrm - frm));
 1014                         vap->iv_stats.is_rx_bad_auth++;
 1015                         goto bad;
 1016                 }
 1017                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
 1018                         challenge = frm;
 1019                 frm += frm[1] + 2;
 1020         }
 1021         switch (seq) {
 1022         case IEEE80211_AUTH_SHARED_CHALLENGE:
 1023         case IEEE80211_AUTH_SHARED_RESPONSE:
 1024                 if (challenge == NULL) {
 1025                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1026                             ni->ni_macaddr, "shared key auth",
 1027                             "%s", "no challenge");
 1028                         vap->iv_stats.is_rx_bad_auth++;
 1029                         goto bad;
 1030                 }
 1031                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
 1032                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1033                             ni->ni_macaddr, "shared key auth",
 1034                             "bad challenge len %d", challenge[1]);
 1035                         vap->iv_stats.is_rx_bad_auth++;
 1036                         goto bad;
 1037                 }
 1038         default:
 1039                 break;
 1040         }
 1041         if (vap->iv_state != IEEE80211_S_AUTH)
 1042                 return;
 1043         switch (seq) {
 1044         case IEEE80211_AUTH_SHARED_PASS:
 1045                 if (ni->ni_challenge != NULL) {
 1046                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
 1047                         ni->ni_challenge = NULL;
 1048                 }
 1049                 if (status != 0) {
 1050                         IEEE80211_NOTE_FRAME(vap,
 1051                             IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
 1052                             "shared key auth failed (reason %d)", status);
 1053                         vap->iv_stats.is_rx_auth_fail++;
 1054                         vap->iv_stats.is_rx_authfail_code = status;
 1055                         return;
 1056                 }
 1057                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 1058                 break;
 1059         case IEEE80211_AUTH_SHARED_CHALLENGE:
 1060                 if (!ieee80211_alloc_challenge(ni))
 1061                         return;
 1062                 /* XXX could optimize by passing recvd challenge */
 1063                 memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
 1064                 IEEE80211_SEND_MGMT(ni,
 1065                         IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 1066                 break;
 1067         default:
 1068                 IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
 1069                     wh, "shared key auth", "bad seq %d", seq);
 1070                 vap->iv_stats.is_rx_bad_auth++;
 1071                 return;
 1072         }
 1073         return;
 1074 bad:
 1075         /*
 1076          * Kick the state machine.  This short-circuits
 1077          * using the mgt frame timeout to trigger the
 1078          * state transition.
 1079          */
 1080         if (vap->iv_state == IEEE80211_S_AUTH)
 1081                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 1082                     IEEE80211_SCAN_FAIL_STATUS);
 1083 }
 1084 
 1085 int
 1086 ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
 1087         const struct ieee80211_frame *wh)
 1088 {
 1089 #define MS(_v, _f)      (((_v) & _f) >> _f##_S)
 1090         struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
 1091         u_int len = frm[1], qosinfo;
 1092         int i;
 1093 
 1094         if (len < sizeof(struct ieee80211_wme_param)-2) {
 1095                 IEEE80211_DISCARD_IE(vap,
 1096                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
 1097                     wh, "WME", "too short, len %u", len);
 1098                 return -1;
 1099         }
 1100         qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
 1101         qosinfo &= WME_QOSINFO_COUNT;
 1102         /* XXX do proper check for wraparound */
 1103         if (qosinfo == wme->wme_wmeChanParams.cap_info)
 1104                 return 0;
 1105         frm += __offsetof(struct ieee80211_wme_param, params_acParams);
 1106         for (i = 0; i < WME_NUM_AC; i++) {
 1107                 struct wmeParams *wmep =
 1108                         &wme->wme_wmeChanParams.cap_wmeParams[i];
 1109                 /* NB: ACI not used */
 1110                 wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
 1111                 wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
 1112                 wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
 1113                 wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
 1114                 wmep->wmep_txopLimit = le16dec(frm+2);
 1115                 frm += 4;
 1116         }
 1117         wme->wme_wmeChanParams.cap_info = qosinfo;
 1118         return 1;
 1119 #undef MS
 1120 }
 1121 
 1122 /*
 1123  * Process 11h Channel Switch Announcement (CSA) ie.  If this
 1124  * is the first CSA then initiate the switch.  Otherwise we
 1125  * track state and trigger completion and/or cancel of the switch.
 1126  * XXX should be public for IBSS use
 1127  */
 1128 static void
 1129 ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
 1130         const struct ieee80211_frame *wh)
 1131 {
 1132         struct ieee80211com *ic = vap->iv_ic;
 1133         const struct ieee80211_csa_ie *csa =
 1134             (const struct ieee80211_csa_ie *) frm;
 1135 
 1136         KASSERT(vap->iv_state >= IEEE80211_S_RUN,
 1137             ("state %s", ieee80211_state_name[vap->iv_state]));
 1138 
 1139         if (csa->csa_mode > 1) {
 1140                 IEEE80211_DISCARD_IE(vap,
 1141                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
 1142                     wh, "CSA", "invalid mode %u", csa->csa_mode);
 1143                 return;
 1144         }
 1145         IEEE80211_LOCK(ic);
 1146         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
 1147                 /*
 1148                  * Convert the channel number to a channel reference.  We
 1149                  * try first to preserve turbo attribute of the current
 1150                  * channel then fallback.  Note this will not work if the
 1151                  * CSA specifies a channel that requires a band switch (e.g.
 1152                  * 11a => 11g).  This is intentional as 11h is defined only
 1153                  * for 5GHz/11a and because the switch does not involve a
 1154                  * reassociation, protocol state (capabilities, negotated
 1155                  * rates, etc) may/will be wrong.
 1156                  */
 1157                 struct ieee80211_channel *c =
 1158                     ieee80211_find_channel_byieee(ic, csa->csa_newchan,
 1159                         (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
 1160                 if (c == NULL) {
 1161                         c = ieee80211_find_channel_byieee(ic,
 1162                             csa->csa_newchan,
 1163                             (ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
 1164                         if (c == NULL) {
 1165                                 IEEE80211_DISCARD_IE(vap,
 1166                                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
 1167                                     wh, "CSA", "invalid channel %u",
 1168                                     csa->csa_newchan);
 1169                                 goto done;
 1170                         }
 1171                 }
 1172 #if IEEE80211_CSA_COUNT_MIN > 0
 1173                 if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
 1174                         /*
 1175                          * Require at least IEEE80211_CSA_COUNT_MIN count to
 1176                          * reduce the risk of being redirected by a fabricated
 1177                          * CSA.  If a valid CSA is dropped we'll still get a
 1178                          * beacon miss when the AP leaves the channel so we'll
 1179                          * eventually follow to the new channel.
 1180                          *
 1181                          * NOTE: this violates the 11h spec that states that
 1182                          * count may be any value and if 0 then a switch
 1183                          * should happen asap.
 1184                          */
 1185                         IEEE80211_DISCARD_IE(vap,
 1186                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
 1187                             wh, "CSA", "count %u too small, must be >= %u",
 1188                             csa->csa_count, IEEE80211_CSA_COUNT_MIN);
 1189                         goto done;
 1190                 }
 1191 #endif
 1192                 ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
 1193         } else {
 1194                 /*
 1195                  * Validate this ie against the initial CSA.  We require
 1196                  * mode and channel not change and the count must be
 1197                  * monotonically decreasing.  This may be pointless and
 1198                  * canceling the switch as a result may be too paranoid but
 1199                  * in the worst case if we drop out of CSA because of this
 1200                  * and the AP does move then we'll just end up taking a
 1201                  * beacon miss and scan to find the AP.
 1202                  *
 1203                  * XXX may want <= on count as we also process ProbeResp
 1204                  * frames and those may come in w/ the same count as the
 1205                  * previous beacon; but doing so leaves us open to a stuck
 1206                  * count until we add a dead-man timer
 1207                  */
 1208                 if (!(csa->csa_count < ic->ic_csa_count &&
 1209                       csa->csa_mode == ic->ic_csa_mode &&
 1210                       csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
 1211                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
 1212                             "CSA ie mismatch, initial ie <%d,%d,%d>, "
 1213                             "this ie <%d,%d,%d>", ic->ic_csa_mode,
 1214                             ic->ic_csa_newchan, ic->ic_csa_count,
 1215                             csa->csa_mode, csa->csa_newchan, csa->csa_count);
 1216                         ieee80211_csa_cancelswitch(ic);
 1217                 } else {
 1218                         if (csa->csa_count <= 1)
 1219                                 ieee80211_csa_completeswitch(ic);
 1220                         else
 1221                                 ic->ic_csa_count = csa->csa_count;
 1222                 }
 1223         }
 1224 done:
 1225         IEEE80211_UNLOCK(ic);
 1226 }
 1227 
 1228 /*
 1229  * Return non-zero if a background scan may be continued:
 1230  * o bg scan is active
 1231  * o no channel switch is pending
 1232  * o there has not been any traffic recently
 1233  *
 1234  * Note we do not check if there is an administrative enable;
 1235  * this is only done to start the scan.  We assume that any
 1236  * change in state will be accompanied by a request to cancel
 1237  * active scans which will otherwise cause this test to fail.
 1238  */
 1239 static __inline int
 1240 contbgscan(struct ieee80211vap *vap)
 1241 {
 1242         struct ieee80211com *ic = vap->iv_ic;
 1243 
 1244         return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
 1245             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
 1246             vap->iv_state == IEEE80211_S_RUN &&         /* XXX? */
 1247             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
 1248 }
 1249 
 1250 /*
 1251  * Return non-zero if a backgrond scan may be started:
 1252  * o bg scanning is administratively enabled
 1253  * o no channel switch is pending
 1254  * o we are not boosted on a dynamic turbo channel
 1255  * o there has not been a scan recently
 1256  * o there has not been any traffic recently
 1257  */
 1258 static __inline int
 1259 startbgscan(struct ieee80211vap *vap)
 1260 {
 1261         struct ieee80211com *ic = vap->iv_ic;
 1262 
 1263         return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
 1264             (ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
 1265 #ifdef IEEE80211_SUPPORT_SUPERG
 1266             !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
 1267 #endif
 1268             ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
 1269             ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
 1270 }
 1271 
 1272 static void
 1273 sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
 1274     const struct ieee80211_rx_stats *rxs,
 1275     int rssi, int nf)
 1276 {
 1277 #define ISREASSOC(_st)  ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
 1278         struct ieee80211vap *vap = ni->ni_vap;
 1279         struct ieee80211com *ic = ni->ni_ic;
 1280         struct ieee80211_channel *rxchan = ic->ic_curchan;
 1281         struct ieee80211_frame *wh;
 1282         uint8_t *frm, *efrm;
 1283         uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
 1284         uint8_t rate;
 1285         int ht_state_change = 0;
 1286 
 1287         wh = mtod(m0, struct ieee80211_frame *);
 1288         frm = (uint8_t *)&wh[1];
 1289         efrm = mtod(m0, uint8_t *) + m0->m_len;
 1290         switch (subtype) {
 1291         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 1292         case IEEE80211_FC0_SUBTYPE_BEACON: {
 1293                 struct ieee80211_scanparams scan;
 1294                 struct ieee80211_channel *c;
 1295                 /*
 1296                  * We process beacon/probe response frames:
 1297                  *    o when scanning, or
 1298                  *    o station mode when associated (to collect state
 1299                  *      updates such as 802.11g slot time)
 1300                  * Frames otherwise received are discarded.
 1301                  */ 
 1302                 if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
 1303                         vap->iv_stats.is_rx_mgtdiscard++;
 1304                         return;
 1305                 }
 1306 
 1307                 /* Override RX channel as appropriate */
 1308                 if (rxs != NULL) {
 1309                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
 1310                         if (c != NULL)
 1311                                 rxchan = c;
 1312                 }
 1313 
 1314                 /* XXX probe response in sta mode when !scanning? */
 1315                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
 1316                         if (! (ic->ic_flags & IEEE80211_F_SCAN))
 1317                                 vap->iv_stats.is_beacon_bad++;
 1318                         return;
 1319                 }
 1320 
 1321                 /*
 1322                  * Count frame now that we know it's to be processed.
 1323                  */
 1324                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 1325                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 1326                         IEEE80211_NODE_STAT(ni, rx_beacons);
 1327                 } else
 1328                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 1329                 /*
 1330                  * When operating in station mode, check for state updates.
 1331                  * Be careful to ignore beacons received while doing a
 1332                  * background scan.  We consider only 11g/WMM stuff right now.
 1333                  */
 1334                 if (ni->ni_associd != 0 &&
 1335                     ((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
 1336                      IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
 1337                         /* record tsf of last beacon */
 1338                         memcpy(ni->ni_tstamp.data, scan.tstamp,
 1339                                 sizeof(ni->ni_tstamp));
 1340                         /* count beacon frame for s/w bmiss handling */
 1341                         vap->iv_swbmiss_count++;
 1342                         vap->iv_bmiss_count = 0;
 1343                         if (ni->ni_erp != scan.erp) {
 1344                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1345                                     wh->i_addr2,
 1346                                     "erp change: was 0x%x, now 0x%x",
 1347                                     ni->ni_erp, scan.erp);
 1348                                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
 1349                                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
 1350                                         ic->ic_flags |= IEEE80211_F_USEPROT;
 1351                                 else
 1352                                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 1353                                 ni->ni_erp = scan.erp;
 1354                                 /* XXX statistic */
 1355                                 /* XXX driver notification */
 1356                         }
 1357                         if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
 1358                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1359                                     wh->i_addr2,
 1360                                     "capabilities change: was 0x%x, now 0x%x",
 1361                                     ni->ni_capinfo, scan.capinfo);
 1362                                 /*
 1363                                  * NB: we assume short preamble doesn't
 1364                                  *     change dynamically
 1365                                  */
 1366                                 ieee80211_set_shortslottime(ic,
 1367                                         IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
 1368                                         (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
 1369                                 ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
 1370                                                | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
 1371                                 /* XXX statistic */
 1372                         }
 1373                         if (scan.wme != NULL &&
 1374                             (ni->ni_flags & IEEE80211_NODE_QOS) &&
 1375                             ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
 1376                                 ieee80211_wme_updateparams(vap);
 1377 #ifdef IEEE80211_SUPPORT_SUPERG
 1378                         if (scan.ath != NULL)
 1379                                 ieee80211_parse_athparams(ni, scan.ath, wh);
 1380 #endif
 1381                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 1382                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1383                                 /* XXX state changes? */
 1384                                 if (ieee80211_ht_updateparams(ni,
 1385                                     scan.htcap, scan.htinfo))
 1386                                         ht_state_change = 1;
 1387                         }
 1388                         if (scan.quiet)
 1389                                 ic->ic_set_quiet(ni, scan.quiet);
 1390 
 1391                         if (scan.tim != NULL) {
 1392                                 struct ieee80211_tim_ie *tim =
 1393                                     (struct ieee80211_tim_ie *) scan.tim;
 1394                                 /*
 1395                                  * XXX Check/debug this code; see if it's about
 1396                                  * the right time to force the VAP awake if we
 1397                                  * receive a frame destined for us?
 1398                                  */
 1399                                 int aid = IEEE80211_AID(ni->ni_associd);
 1400                                 int ix = aid / NBBY;
 1401                                 int min = tim->tim_bitctl &~ 1;
 1402                                 int max = tim->tim_len + min - 4;
 1403                                 int tim_ucast = 0, tim_mcast = 0;
 1404 
 1405                                 /*
 1406                                  * Only do this for unicast traffic in the TIM
 1407                                  * The multicast traffic notification for
 1408                                  * the scan notification stuff should occur
 1409                                  * differently.
 1410                                  */
 1411                                 if (min <= ix && ix <= max &&
 1412                                      isset(tim->tim_bitmap - min, aid)) {
 1413                                         tim_ucast = 1;
 1414                                 }
 1415 
 1416                                 /*
 1417                                  * Do a separate notification
 1418                                  * for the multicast bit being set.
 1419                                  */
 1420                                 if (tim->tim_bitctl & 1) {
 1421                                         tim_mcast = 1;
 1422                                 }
 1423 
 1424                                 /*
 1425                                  * If the TIM indicates there's traffic for
 1426                                  * us then get us out of STA mode powersave.
 1427                                  */
 1428                                 if (tim_ucast == 1) {
 1429 
 1430                                         /*
 1431                                          * Wake us out of SLEEP state if we're
 1432                                          * in it; and if we're doing bgscan
 1433                                          * then wake us out of STA powersave.
 1434                                          */
 1435                                         ieee80211_sta_tim_notify(vap, 1);
 1436 
 1437                                         /*
 1438                                          * This is preventing us from
 1439                                          * continuing a bgscan; because it
 1440                                          * tricks the contbgscan()
 1441                                          * routine to think there's always
 1442                                          * traffic for us.
 1443                                          *
 1444                                          * I think we need both an RX and
 1445                                          * TX ic_lastdata field.
 1446                                          */
 1447                                         ic->ic_lastdata = ticks;
 1448                                 }
 1449 
 1450                                 ni->ni_dtim_count = tim->tim_count;
 1451                                 ni->ni_dtim_period = tim->tim_period;
 1452                         }
 1453                         if (scan.csa != NULL &&
 1454                             (vap->iv_flags & IEEE80211_F_DOTH))
 1455                                 ieee80211_parse_csaparams(vap, scan.csa, wh);
 1456                         else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
 1457                                 /*
 1458                                  * No CSA ie or 11h disabled, but a channel
 1459                                  * switch is pending; drop out so we aren't
 1460                                  * stuck in CSA state.  If the AP really is
 1461                                  * moving we'll get a beacon miss and scan.
 1462                                  */
 1463                                 IEEE80211_LOCK(ic);
 1464                                 ieee80211_csa_cancelswitch(ic);
 1465                                 IEEE80211_UNLOCK(ic);
 1466                         }
 1467                         /*
 1468                          * If scanning, pass the info to the scan module.
 1469                          * Otherwise, check if it's the right time to do
 1470                          * a background scan.  Background scanning must
 1471                          * be enabled and we must not be operating in the
 1472                          * turbo phase of dynamic turbo mode.  Then,
 1473                          * it's been a while since the last background
 1474                          * scan and if no data frames have come through
 1475                          * recently, kick off a scan.  Note that this
 1476                          * is the mechanism by which a background scan
 1477                          * is started _and_ continued each time we
 1478                          * return on-channel to receive a beacon from
 1479                          * our ap.
 1480                          */
 1481                         if (ic->ic_flags & IEEE80211_F_SCAN) {
 1482                                 ieee80211_add_scan(vap, rxchan,
 1483                                     &scan, wh, subtype, rssi, nf);
 1484                         } else if (contbgscan(vap)) {
 1485                                 ieee80211_bg_scan(vap, 0);
 1486                         } else if (startbgscan(vap)) {
 1487                                 vap->iv_stats.is_scan_bg++;
 1488 #if 0
 1489                                 /* wakeup if we are sleeing */
 1490                                 ieee80211_set_pwrsave(vap, 0);
 1491 #endif
 1492                                 ieee80211_bg_scan(vap, 0);
 1493                         }
 1494 
 1495                         /*
 1496                          * Put the station to sleep if we haven't seen
 1497                          * traffic in a while.
 1498                          */
 1499                         IEEE80211_LOCK(ic);
 1500                         ieee80211_sta_ps_timer_check(vap);
 1501                         IEEE80211_UNLOCK(ic);
 1502 
 1503                         /*
 1504                          * If we've had a channel width change (eg HT20<->HT40)
 1505                          * then schedule a delayed driver notification.
 1506                          */
 1507                         if (ht_state_change)
 1508                                 ieee80211_update_chw(ic);
 1509                         return;
 1510                 }
 1511                 /*
 1512                  * If scanning, just pass information to the scan module.
 1513                  */
 1514                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 1515                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 1516                                 /*
 1517                                  * Actively scanning a channel marked passive;
 1518                                  * send a probe request now that we know there
 1519                                  * is 802.11 traffic present.
 1520                                  *
 1521                                  * XXX check if the beacon we recv'd gives
 1522                                  * us what we need and suppress the probe req
 1523                                  */
 1524                                 ieee80211_probe_curchan(vap, 1);
 1525                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 1526                         }
 1527                         ieee80211_add_scan(vap, rxchan, &scan, wh,
 1528                             subtype, rssi, nf);
 1529                         return;
 1530                 }
 1531                 break;
 1532         }
 1533 
 1534         case IEEE80211_FC0_SUBTYPE_AUTH: {
 1535                 uint16_t algo, seq, status;
 1536                 /*
 1537                  * auth frame format
 1538                  *      [2] algorithm
 1539                  *      [2] sequence
 1540                  *      [2] status
 1541                  *      [tlv*] challenge
 1542                  */
 1543                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
 1544                 algo   = le16toh(*(uint16_t *)frm);
 1545                 seq    = le16toh(*(uint16_t *)(frm + 2));
 1546                 status = le16toh(*(uint16_t *)(frm + 4));
 1547                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
 1548                     "recv auth frame with algorithm %d seq %d", algo, seq);
 1549 
 1550                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
 1551                         IEEE80211_DISCARD(vap,
 1552                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
 1553                             wh, "auth", "%s", "TKIP countermeasures enabled");
 1554                         vap->iv_stats.is_rx_auth_countermeasures++;
 1555                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
 1556                                 ieee80211_send_error(ni, wh->i_addr2,
 1557                                         IEEE80211_FC0_SUBTYPE_AUTH,
 1558                                         IEEE80211_REASON_MIC_FAILURE);
 1559                         }
 1560                         return;
 1561                 }
 1562                 if (algo == IEEE80211_AUTH_ALG_SHARED)
 1563                         sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
 1564                             seq, status);
 1565                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
 1566                         sta_auth_open(ni, wh, rssi, nf, seq, status);
 1567                 else {
 1568                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1569                             wh, "auth", "unsupported alg %d", algo);
 1570                         vap->iv_stats.is_rx_auth_unsupported++;
 1571                         return;
 1572                 } 
 1573                 break;
 1574         }
 1575 
 1576         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 1577         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
 1578                 uint16_t capinfo, associd;
 1579                 uint16_t status;
 1580 
 1581                 if (vap->iv_state != IEEE80211_S_ASSOC) {
 1582                         vap->iv_stats.is_rx_mgtdiscard++;
 1583                         return;
 1584                 }
 1585 
 1586                 /*
 1587                  * asresp frame format
 1588                  *      [2] capability information
 1589                  *      [2] status
 1590                  *      [2] association ID
 1591                  *      [tlv] supported rates
 1592                  *      [tlv] extended supported rates
 1593                  *      [tlv] WME
 1594                  *      [tlv] HT capabilities
 1595                  *      [tlv] HT info
 1596                  */
 1597                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
 1598                 ni = vap->iv_bss;
 1599                 capinfo = le16toh(*(uint16_t *)frm);
 1600                 frm += 2;
 1601                 status = le16toh(*(uint16_t *)frm);
 1602                 frm += 2;
 1603                 if (status != 0) {
 1604                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1605                             wh->i_addr2, "%sassoc failed (reason %d)",
 1606                             ISREASSOC(subtype) ?  "re" : "", status);
 1607                         vap->iv_stats.is_rx_auth_fail++;        /* XXX */
 1608                         return;
 1609                 }
 1610                 associd = le16toh(*(uint16_t *)frm);
 1611                 frm += 2;
 1612 
 1613                 rates = xrates = wme = htcap = htinfo = NULL;
 1614                 while (efrm - frm > 1) {
 1615                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 1616                         switch (*frm) {
 1617                         case IEEE80211_ELEMID_RATES:
 1618                                 rates = frm;
 1619                                 break;
 1620                         case IEEE80211_ELEMID_XRATES:
 1621                                 xrates = frm;
 1622                                 break;
 1623                         case IEEE80211_ELEMID_HTCAP:
 1624                                 htcap = frm;
 1625                                 break;
 1626                         case IEEE80211_ELEMID_HTINFO:
 1627                                 htinfo = frm;
 1628                                 break;
 1629                         case IEEE80211_ELEMID_VENDOR:
 1630                                 if (iswmeoui(frm))
 1631                                         wme = frm;
 1632                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
 1633                                         /*
 1634                                          * Accept pre-draft HT ie's if the
 1635                                          * standard ones have not been seen.
 1636                                          */
 1637                                         if (ishtcapoui(frm)) {
 1638                                                 if (htcap == NULL)
 1639                                                         htcap = frm;
 1640                                         } else if (ishtinfooui(frm)) {
 1641                                                 if (htinfo == NULL)
 1642                                                         htinfo = frm;
 1643                                         }
 1644                                 }
 1645                                 /* XXX Atheros OUI support */
 1646                                 break;
 1647                         }
 1648                         frm += frm[1] + 2;
 1649                 }
 1650 
 1651                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 1652                 if (xrates != NULL)
 1653                         IEEE80211_VERIFY_ELEMENT(xrates,
 1654                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 1655                 rate = ieee80211_setup_rates(ni, rates, xrates,
 1656                                 IEEE80211_F_JOIN |
 1657                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1658                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1659                 if (rate & IEEE80211_RATE_BASIC) {
 1660                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
 1661                             wh->i_addr2,
 1662                             "%sassoc failed (rate set mismatch)",
 1663                             ISREASSOC(subtype) ?  "re" : "");
 1664                         vap->iv_stats.is_rx_assoc_norate++;
 1665                         ieee80211_new_state(vap, IEEE80211_S_SCAN,
 1666                             IEEE80211_SCAN_FAIL_STATUS);
 1667                         return;
 1668                 }
 1669 
 1670                 ni->ni_capinfo = capinfo;
 1671                 ni->ni_associd = associd;
 1672                 if (ni->ni_jointime == 0)
 1673                         ni->ni_jointime = time_uptime;
 1674                 if (wme != NULL &&
 1675                     ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
 1676                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1677                         ieee80211_wme_updateparams(vap);
 1678                 } else
 1679                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
 1680                 /*
 1681                  * Setup HT state according to the negotiation.
 1682                  *
 1683                  * NB: shouldn't need to check if HT use is enabled but some
 1684                  *     ap's send back HT ie's even when we don't indicate we
 1685                  *     are HT capable in our AssocReq.
 1686                  */
 1687                 if (htcap != NULL && htinfo != NULL &&
 1688                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1689                         ieee80211_ht_node_init(ni);
 1690                         ieee80211_ht_updateparams(ni, htcap, htinfo);
 1691                         ieee80211_setup_htrates(ni, htcap,
 1692                              IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
 1693                         ieee80211_setup_basic_htrates(ni, htinfo);
 1694                         ieee80211_node_setuptxparms(ni);
 1695                         ieee80211_ratectl_node_init(ni);
 1696                 }
 1697 
 1698                 /*
 1699                  * Always initialise FF/superg state; we can use this
 1700                  * for doing A-MSDU encapsulation as well.
 1701                  */
 1702 #ifdef  IEEE80211_SUPPORT_SUPERG
 1703                 ieee80211_ff_node_init(ni);
 1704 #endif
 1705 
 1706                 /*
 1707                  * Configure state now that we are associated.
 1708                  *
 1709                  * XXX may need different/additional driver callbacks?
 1710                  */
 1711                 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
 1712                     (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
 1713                         ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
 1714                         ic->ic_flags &= ~IEEE80211_F_USEBARKER;
 1715                 } else {
 1716                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
 1717                         ic->ic_flags |= IEEE80211_F_USEBARKER;
 1718                 }
 1719                 ieee80211_set_shortslottime(ic,
 1720                         IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
 1721                         (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
 1722                 /*
 1723                  * Honor ERP protection.
 1724                  *
 1725                  * NB: ni_erp should zero for non-11g operation.
 1726                  */
 1727                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
 1728                     (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
 1729                         ic->ic_flags |= IEEE80211_F_USEPROT;
 1730                 else
 1731                         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 1732                 IEEE80211_NOTE_MAC(vap,
 1733                     IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
 1734                     "%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
 1735                     ISREASSOC(subtype) ? "re" : "",
 1736                     IEEE80211_NODE_AID(ni),
 1737                     ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
 1738                     ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
 1739                     ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
 1740                     ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
 1741                     ni->ni_flags & IEEE80211_NODE_HT ?
 1742                         (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
 1743                     ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
 1744                     ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
 1745                         ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
 1746                     ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
 1747                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
 1748                         ", fast-frames" : "",
 1749                     IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
 1750                         ", turbo" : ""
 1751                 );
 1752                 ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
 1753                 break;
 1754         }
 1755 
 1756         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
 1757                 uint16_t reason;
 1758 
 1759                 if (vap->iv_state == IEEE80211_S_SCAN) {
 1760                         vap->iv_stats.is_rx_mgtdiscard++;
 1761                         return;
 1762                 }
 1763                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
 1764                         /* NB: can happen when in promiscuous mode */
 1765                         vap->iv_stats.is_rx_mgtdiscard++;
 1766                         break;
 1767                 }
 1768 
 1769                 /*
 1770                  * deauth frame format
 1771                  *      [2] reason
 1772                  */
 1773                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
 1774                 reason = le16toh(*(uint16_t *)frm);
 1775 
 1776                 vap->iv_stats.is_rx_deauth++;
 1777                 vap->iv_stats.is_rx_deauth_code = reason;
 1778                 IEEE80211_NODE_STAT(ni, rx_deauth);
 1779 
 1780                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
 1781                     "recv deauthenticate (reason: %d (%s))", reason,
 1782                     ieee80211_reason_to_string(reason));
 1783                 ieee80211_new_state(vap, IEEE80211_S_AUTH,
 1784                     (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
 1785                 break;
 1786         }
 1787 
 1788         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
 1789                 uint16_t reason;
 1790 
 1791                 if (vap->iv_state != IEEE80211_S_RUN &&
 1792                     vap->iv_state != IEEE80211_S_ASSOC &&
 1793                     vap->iv_state != IEEE80211_S_AUTH) {
 1794                         vap->iv_stats.is_rx_mgtdiscard++;
 1795                         return;
 1796                 }
 1797                 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
 1798                         /* NB: can happen when in promiscuous mode */
 1799                         vap->iv_stats.is_rx_mgtdiscard++;
 1800                         break;
 1801                 }
 1802 
 1803                 /*
 1804                  * disassoc frame format
 1805                  *      [2] reason
 1806                  */
 1807                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
 1808                 reason = le16toh(*(uint16_t *)frm);
 1809 
 1810                 vap->iv_stats.is_rx_disassoc++;
 1811                 vap->iv_stats.is_rx_disassoc_code = reason;
 1812                 IEEE80211_NODE_STAT(ni, rx_disassoc);
 1813 
 1814                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 1815                     "recv disassociate (reason: %d (%s))", reason,
 1816                     ieee80211_reason_to_string(reason));
 1817                 ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
 1818                 break;
 1819         }
 1820 
 1821         case IEEE80211_FC0_SUBTYPE_ACTION:
 1822         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 1823                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 1824                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 1825                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1826                             wh, NULL, "%s", "not for us");
 1827                         vap->iv_stats.is_rx_mgtdiscard++;
 1828                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 1829                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1830                             wh, NULL, "wrong state %s",
 1831                             ieee80211_state_name[vap->iv_state]);
 1832                         vap->iv_stats.is_rx_mgtdiscard++;
 1833                 } else {
 1834                         if (ieee80211_parse_action(ni, m0) == 0)
 1835                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 1836                 }
 1837                 break;
 1838 
 1839         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 1840         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 1841         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 1842         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
 1843         case IEEE80211_FC0_SUBTYPE_ATIM:
 1844                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1845                     wh, NULL, "%s", "not handled");
 1846                 vap->iv_stats.is_rx_mgtdiscard++;
 1847                 break;
 1848 
 1849         default:
 1850                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1851                     wh, "mgt", "subtype 0x%x not handled", subtype);
 1852                 vap->iv_stats.is_rx_badsubtype++;
 1853                 break;
 1854         }
 1855 #undef ISREASSOC
 1856 }
 1857 
 1858 static void
 1859 sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
 1860 {
 1861         switch (subtype) {
 1862         case IEEE80211_FC0_SUBTYPE_BAR:
 1863                 ieee80211_recv_bar(ni, m);
 1864                 break;
 1865         }
 1866 }

Cache object: 8e3c161a98ac3105d88b49b4f183c4a0


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.