The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/net80211/ieee80211_node.c

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/8/sys/net80211/ieee80211_node.c 217650 2011-01-20 18:41:46Z bschmidt $");
   29 
   30 #include "opt_wlan.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h> 
   34 #include <sys/mbuf.h>   
   35 #include <sys/malloc.h>
   36 #include <sys/kernel.h>
   37 
   38 #include <sys/socket.h>
   39  
   40 #include <net/if.h>
   41 #include <net/if_media.h>
   42 #include <net/ethernet.h>
   43 
   44 #include <net80211/ieee80211_var.h>
   45 #include <net80211/ieee80211_input.h>
   46 #ifdef IEEE80211_SUPPORT_SUPERG
   47 #include <net80211/ieee80211_superg.h>
   48 #endif
   49 #ifdef IEEE80211_SUPPORT_TDMA
   50 #include <net80211/ieee80211_tdma.h>
   51 #endif
   52 #include <net80211/ieee80211_wds.h>
   53 #include <net80211/ieee80211_mesh.h>
   54 #include <net80211/ieee80211_ratectl.h>
   55 
   56 #include <net/bpf.h>
   57 
   58 /*
   59  * IEEE80211_NODE_HASHSIZE must be a power of 2.
   60  */
   61 CTASSERT((IEEE80211_NODE_HASHSIZE & (IEEE80211_NODE_HASHSIZE-1)) == 0);
   62 
   63 /*
   64  * Association id's are managed with a bit vector.
   65  */
   66 #define IEEE80211_AID_SET(_vap, b) \
   67         ((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] |= \
   68                 (1 << (IEEE80211_AID(b) % 32)))
   69 #define IEEE80211_AID_CLR(_vap, b) \
   70         ((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] &= \
   71                 ~(1 << (IEEE80211_AID(b) % 32)))
   72 #define IEEE80211_AID_ISSET(_vap, b) \
   73         ((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32)))
   74 
   75 #ifdef IEEE80211_DEBUG_REFCNT
   76 #define REFCNT_LOC "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line
   77 #else
   78 #define REFCNT_LOC "%s %p<%s> refcnt %d\n", __func__
   79 #endif
   80 
   81 static int ieee80211_sta_join1(struct ieee80211_node *);
   82 
   83 static struct ieee80211_node *node_alloc(struct ieee80211vap *,
   84         const uint8_t [IEEE80211_ADDR_LEN]);
   85 static void node_cleanup(struct ieee80211_node *);
   86 static void node_free(struct ieee80211_node *);
   87 static void node_age(struct ieee80211_node *);
   88 static int8_t node_getrssi(const struct ieee80211_node *);
   89 static void node_getsignal(const struct ieee80211_node *, int8_t *, int8_t *);
   90 static void node_getmimoinfo(const struct ieee80211_node *,
   91         struct ieee80211_mimo_info *);
   92 
   93 static void _ieee80211_free_node(struct ieee80211_node *);
   94 
   95 static void ieee80211_node_table_init(struct ieee80211com *ic,
   96         struct ieee80211_node_table *nt, const char *name,
   97         int inact, int keymaxix);
   98 static void ieee80211_node_table_reset(struct ieee80211_node_table *,
   99         struct ieee80211vap *);
  100 static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt);
  101 static void ieee80211_erp_timeout(struct ieee80211com *);
  102 
  103 MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
  104 MALLOC_DEFINE(M_80211_NODE_IE, "80211nodeie", "802.11 node ie");
  105 
  106 void
  107 ieee80211_node_attach(struct ieee80211com *ic)
  108 {
  109         /* XXX really want maxlen enforced per-sta */
  110         ieee80211_ageq_init(&ic->ic_stageq, ic->ic_max_keyix * 8,
  111             "802.11 staging q");
  112         ieee80211_node_table_init(ic, &ic->ic_sta, "station",
  113                 IEEE80211_INACT_INIT, ic->ic_max_keyix);
  114         callout_init(&ic->ic_inact, CALLOUT_MPSAFE);
  115         callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
  116                 ieee80211_node_timeout, ic);
  117 
  118         ic->ic_node_alloc = node_alloc;
  119         ic->ic_node_free = node_free;
  120         ic->ic_node_cleanup = node_cleanup;
  121         ic->ic_node_age = node_age;
  122         ic->ic_node_drain = node_age;           /* NB: same as age */
  123         ic->ic_node_getrssi = node_getrssi;
  124         ic->ic_node_getsignal = node_getsignal;
  125         ic->ic_node_getmimoinfo = node_getmimoinfo;
  126 
  127         /*
  128          * Set flags to be propagated to all vap's;
  129          * these define default behaviour/configuration.
  130          */
  131         ic->ic_flags_ext |= IEEE80211_FEXT_INACT; /* inactivity processing */
  132 }
  133 
  134 void
  135 ieee80211_node_detach(struct ieee80211com *ic)
  136 {
  137 
  138         callout_drain(&ic->ic_inact);
  139         ieee80211_node_table_cleanup(&ic->ic_sta);
  140         ieee80211_ageq_cleanup(&ic->ic_stageq);
  141 }
  142 
  143 void
  144 ieee80211_node_vattach(struct ieee80211vap *vap)
  145 {
  146         /* NB: driver can override */
  147         vap->iv_max_aid = IEEE80211_AID_DEF;
  148 
  149         /* default station inactivity timer setings */
  150         vap->iv_inact_init = IEEE80211_INACT_INIT;
  151         vap->iv_inact_auth = IEEE80211_INACT_AUTH;
  152         vap->iv_inact_run = IEEE80211_INACT_RUN;
  153         vap->iv_inact_probe = IEEE80211_INACT_PROBE;
  154 
  155         IEEE80211_DPRINTF(vap, IEEE80211_MSG_INACT,
  156             "%s: init %u auth %u run %u probe %u\n", __func__,
  157             vap->iv_inact_init, vap->iv_inact_auth,
  158             vap->iv_inact_run, vap->iv_inact_probe);
  159 }
  160 
  161 void
  162 ieee80211_node_latevattach(struct ieee80211vap *vap)
  163 {
  164         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
  165                 /* XXX should we allow max aid to be zero? */
  166                 if (vap->iv_max_aid < IEEE80211_AID_MIN) {
  167                         vap->iv_max_aid = IEEE80211_AID_MIN;
  168                         if_printf(vap->iv_ifp,
  169                             "WARNING: max aid too small, changed to %d\n",
  170                             vap->iv_max_aid);
  171                 }
  172                 vap->iv_aid_bitmap = (uint32_t *) malloc(
  173                         howmany(vap->iv_max_aid, 32) * sizeof(uint32_t),
  174                         M_80211_NODE, M_NOWAIT | M_ZERO);
  175                 if (vap->iv_aid_bitmap == NULL) {
  176                         /* XXX no way to recover */
  177                         printf("%s: no memory for AID bitmap, max aid %d!\n",
  178                             __func__, vap->iv_max_aid);
  179                         vap->iv_max_aid = 0;
  180                 }
  181         }
  182 
  183         ieee80211_reset_bss(vap);
  184 
  185         vap->iv_auth = ieee80211_authenticator_get(vap->iv_bss->ni_authmode);
  186 }
  187 
  188 void
  189 ieee80211_node_vdetach(struct ieee80211vap *vap)
  190 {
  191         struct ieee80211com *ic = vap->iv_ic;
  192 
  193         ieee80211_node_table_reset(&ic->ic_sta, vap);
  194         if (vap->iv_bss != NULL) {
  195                 ieee80211_free_node(vap->iv_bss);
  196                 vap->iv_bss = NULL;
  197         }
  198         if (vap->iv_aid_bitmap != NULL) {
  199                 free(vap->iv_aid_bitmap, M_80211_NODE);
  200                 vap->iv_aid_bitmap = NULL;
  201         }
  202 }
  203 
  204 /* 
  205  * Port authorize/unauthorize interfaces for use by an authenticator.
  206  */
  207 
  208 void
  209 ieee80211_node_authorize(struct ieee80211_node *ni)
  210 {
  211         struct ieee80211vap *vap = ni->ni_vap;
  212 
  213         ni->ni_flags |= IEEE80211_NODE_AUTH;
  214         ni->ni_inact_reload = vap->iv_inact_run;
  215         ni->ni_inact = ni->ni_inact_reload;
  216 
  217         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
  218             "%s: inact_reload %u", __func__, ni->ni_inact_reload);
  219 }
  220 
  221 void
  222 ieee80211_node_unauthorize(struct ieee80211_node *ni)
  223 {
  224         struct ieee80211vap *vap = ni->ni_vap;
  225 
  226         ni->ni_flags &= ~IEEE80211_NODE_AUTH;
  227         ni->ni_inact_reload = vap->iv_inact_auth;
  228         if (ni->ni_inact > ni->ni_inact_reload)
  229                 ni->ni_inact = ni->ni_inact_reload;
  230 
  231         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
  232             "%s: inact_reload %u inact %u", __func__,
  233             ni->ni_inact_reload, ni->ni_inact);
  234 }
  235 
  236 /*
  237  * Fix tx parameters for a node according to ``association state''.
  238  */
  239 void
  240 ieee80211_node_setuptxparms(struct ieee80211_node *ni)
  241 {
  242         struct ieee80211vap *vap = ni->ni_vap;
  243         enum ieee80211_phymode mode;
  244 
  245         if (ni->ni_flags & IEEE80211_NODE_HT) {
  246                 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
  247                         mode = IEEE80211_MODE_11NA;
  248                 else
  249                         mode = IEEE80211_MODE_11NG;
  250         } else {                                /* legacy rate handling */
  251                 if (IEEE80211_IS_CHAN_ST(ni->ni_chan))
  252                         mode = IEEE80211_MODE_STURBO_A;
  253                 else if (IEEE80211_IS_CHAN_HALF(ni->ni_chan))
  254                         mode = IEEE80211_MODE_HALF;
  255                 else if (IEEE80211_IS_CHAN_QUARTER(ni->ni_chan))
  256                         mode = IEEE80211_MODE_QUARTER;
  257                 /* NB: 108A should be handled as 11a */
  258                 else if (IEEE80211_IS_CHAN_A(ni->ni_chan))
  259                         mode = IEEE80211_MODE_11A;
  260                 else if (IEEE80211_IS_CHAN_108G(ni->ni_chan) ||
  261                     (ni->ni_flags & IEEE80211_NODE_ERP))
  262                         mode = IEEE80211_MODE_11G;
  263                 else
  264                         mode = IEEE80211_MODE_11B;
  265         }
  266         ni->ni_txparms = &vap->iv_txparms[mode];
  267 }
  268 
  269 /*
  270  * Set/change the channel.  The rate set is also updated as
  271  * to insure a consistent view by drivers.
  272  * XXX should be private but hostap needs it to deal with CSA
  273  */
  274 void
  275 ieee80211_node_set_chan(struct ieee80211_node *ni,
  276         struct ieee80211_channel *chan)
  277 {
  278         struct ieee80211com *ic = ni->ni_ic;
  279         struct ieee80211vap *vap = ni->ni_vap;
  280         enum ieee80211_phymode mode;
  281 
  282         KASSERT(chan != IEEE80211_CHAN_ANYC, ("no channel"));
  283 
  284         ni->ni_chan = chan;
  285         mode = ieee80211_chan2mode(chan);
  286         if (IEEE80211_IS_CHAN_HT(chan)) {
  287                 /*
  288                  * XXX Gotta be careful here; the rate set returned by
  289                  * ieee80211_get_suprates is actually any HT rate
  290                  * set so blindly copying it will be bad.  We must
  291                  * install the legacy rate est in ni_rates and the
  292                  * HT rate set in ni_htrates.
  293                  */
  294                 ni->ni_htrates = *ieee80211_get_suphtrates(ic, chan);
  295                 /*
  296                  * Setup bss tx parameters based on operating mode.  We
  297                  * use legacy rates when operating in a mixed HT+non-HT bss
  298                  * and non-ERP rates in 11g for mixed ERP+non-ERP bss.
  299                  */
  300                 if (mode == IEEE80211_MODE_11NA &&
  301                     (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
  302                         mode = IEEE80211_MODE_11A;
  303                 else if (mode == IEEE80211_MODE_11NG &&
  304                     (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
  305                         mode = IEEE80211_MODE_11G;
  306                 if (mode == IEEE80211_MODE_11G &&
  307                     (vap->iv_flags & IEEE80211_F_PUREG) == 0)
  308                         mode = IEEE80211_MODE_11B;
  309         }
  310         ni->ni_txparms = &vap->iv_txparms[mode];
  311         ni->ni_rates = *ieee80211_get_suprates(ic, chan);
  312 }
  313 
  314 static __inline void
  315 copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
  316 {
  317         /* propagate useful state */
  318         nbss->ni_authmode = obss->ni_authmode;
  319         nbss->ni_txpower = obss->ni_txpower;
  320         nbss->ni_vlan = obss->ni_vlan;
  321         /* XXX statistics? */
  322         /* XXX legacy WDS bssid? */
  323 }
  324 
  325 void
  326 ieee80211_create_ibss(struct ieee80211vap* vap, struct ieee80211_channel *chan)
  327 {
  328         struct ieee80211com *ic = vap->iv_ic;
  329         struct ieee80211_node *ni;
  330 
  331         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  332                 "%s: creating %s on channel %u\n", __func__,
  333                 ieee80211_opmode_name[vap->iv_opmode],
  334                 ieee80211_chan2ieee(ic, chan));
  335 
  336         ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
  337         if (ni == NULL) {
  338                 /* XXX recovery? */
  339                 return;
  340         }
  341         IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
  342         ni->ni_esslen = vap->iv_des_ssid[0].len;
  343         memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
  344         if (vap->iv_bss != NULL)
  345                 copy_bss(ni, vap->iv_bss);
  346         ni->ni_intval = ic->ic_bintval;
  347         if (vap->iv_flags & IEEE80211_F_PRIVACY)
  348                 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
  349         if (ic->ic_phytype == IEEE80211_T_FH) {
  350                 ni->ni_fhdwell = 200;   /* XXX */
  351                 ni->ni_fhindex = 1;
  352         }
  353         if (vap->iv_opmode == IEEE80211_M_IBSS) {
  354                 vap->iv_flags |= IEEE80211_F_SIBSS;
  355                 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS;       /* XXX */
  356                 if (vap->iv_flags & IEEE80211_F_DESBSSID)
  357                         IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
  358                 else {
  359                         get_random_bytes(ni->ni_bssid, IEEE80211_ADDR_LEN);
  360                         /* clear group bit, add local bit */
  361                         ni->ni_bssid[0] = (ni->ni_bssid[0] &~ 0x01) | 0x02;
  362                 }
  363         } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
  364                 if (vap->iv_flags & IEEE80211_F_DESBSSID)
  365                         IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
  366                 else
  367 #ifdef IEEE80211_SUPPORT_TDMA
  368                 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
  369 #endif
  370                         memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN);
  371 #ifdef IEEE80211_SUPPORT_MESH
  372         } else if (vap->iv_opmode == IEEE80211_M_MBSS) {
  373                 ni->ni_meshidlen = vap->iv_mesh->ms_idlen;
  374                 memcpy(ni->ni_meshid, vap->iv_mesh->ms_id, ni->ni_meshidlen);
  375 #endif
  376         }
  377         /* 
  378          * Fix the channel and related attributes.
  379          */
  380         /* clear DFS CAC state on previous channel */
  381         if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
  382             ic->ic_bsschan->ic_freq != chan->ic_freq &&
  383             IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan))
  384                 ieee80211_dfs_cac_clear(ic, ic->ic_bsschan);
  385         ic->ic_bsschan = chan;
  386         ieee80211_node_set_chan(ni, chan);
  387         ic->ic_curmode = ieee80211_chan2mode(chan);
  388         /*
  389          * Do mode-specific setup.
  390          */
  391         if (IEEE80211_IS_CHAN_FULL(chan)) {
  392                 if (IEEE80211_IS_CHAN_ANYG(chan)) {
  393                         /*
  394                          * Use a mixed 11b/11g basic rate set.
  395                          */
  396                         ieee80211_setbasicrates(&ni->ni_rates,
  397                             IEEE80211_MODE_11G);
  398                         if (vap->iv_flags & IEEE80211_F_PUREG) {
  399                                 /*
  400                                  * Also mark OFDM rates basic so 11b
  401                                  * stations do not join (WiFi compliance).
  402                                  */
  403                                 ieee80211_addbasicrates(&ni->ni_rates,
  404                                     IEEE80211_MODE_11A);
  405                         }
  406                 } else if (IEEE80211_IS_CHAN_B(chan)) {
  407                         /*
  408                          * Force pure 11b rate set.
  409                          */
  410                         ieee80211_setbasicrates(&ni->ni_rates,
  411                                 IEEE80211_MODE_11B);
  412                 }
  413         }
  414 
  415         (void) ieee80211_sta_join1(ieee80211_ref_node(ni));
  416 }
  417 
  418 /*
  419  * Reset bss state on transition to the INIT state.
  420  * Clear any stations from the table (they have been
  421  * deauth'd) and reset the bss node (clears key, rate
  422  * etc. state).
  423  */
  424 void
  425 ieee80211_reset_bss(struct ieee80211vap *vap)
  426 {
  427         struct ieee80211com *ic = vap->iv_ic;
  428         struct ieee80211_node *ni, *obss;
  429 
  430         ieee80211_node_table_reset(&ic->ic_sta, vap);
  431         /* XXX multi-bss: wrong */
  432         ieee80211_reset_erp(ic);
  433 
  434         ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
  435         KASSERT(ni != NULL, ("unable to setup initial BSS node"));
  436         obss = vap->iv_bss;
  437         vap->iv_bss = ieee80211_ref_node(ni);
  438         if (obss != NULL) {
  439                 copy_bss(ni, obss);
  440                 ni->ni_intval = ic->ic_bintval;
  441                 ieee80211_free_node(obss);
  442         } else
  443                 IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
  444 }
  445 
  446 static int
  447 match_ssid(const struct ieee80211_node *ni,
  448         int nssid, const struct ieee80211_scan_ssid ssids[])
  449 {
  450         int i;
  451 
  452         for (i = 0; i < nssid; i++) {
  453                 if (ni->ni_esslen == ssids[i].len &&
  454                      memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0)
  455                         return 1;
  456         }
  457         return 0;
  458 }
  459 
  460 /*
  461  * Test a node for suitability/compatibility.
  462  */
  463 static int
  464 check_bss(struct ieee80211vap *vap, struct ieee80211_node *ni)
  465 {
  466         struct ieee80211com *ic = ni->ni_ic;
  467         uint8_t rate;
  468 
  469         if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
  470                 return 0;
  471         if (vap->iv_opmode == IEEE80211_M_IBSS) {
  472                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
  473                         return 0;
  474         } else {
  475                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
  476                         return 0;
  477         }
  478         if (vap->iv_flags & IEEE80211_F_PRIVACY) {
  479                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
  480                         return 0;
  481         } else {
  482                 /* XXX does this mean privacy is supported or required? */
  483                 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
  484                         return 0;
  485         }
  486         rate = ieee80211_fix_rate(ni, &ni->ni_rates,
  487             IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
  488         if (rate & IEEE80211_RATE_BASIC)
  489                 return 0;
  490         if (vap->iv_des_nssid != 0 &&
  491             !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
  492                 return 0;
  493         if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
  494             !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
  495                 return 0;
  496         return 1;
  497 }
  498 
  499 #ifdef IEEE80211_DEBUG
  500 /*
  501  * Display node suitability/compatibility.
  502  */
  503 static void
  504 check_bss_debug(struct ieee80211vap *vap, struct ieee80211_node *ni)
  505 {
  506         struct ieee80211com *ic = ni->ni_ic;
  507         uint8_t rate;
  508         int fail;
  509 
  510         fail = 0;
  511         if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
  512                 fail |= 0x01;
  513         if (vap->iv_opmode == IEEE80211_M_IBSS) {
  514                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
  515                         fail |= 0x02;
  516         } else {
  517                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
  518                         fail |= 0x02;
  519         }
  520         if (vap->iv_flags & IEEE80211_F_PRIVACY) {
  521                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
  522                         fail |= 0x04;
  523         } else {
  524                 /* XXX does this mean privacy is supported or required? */
  525                 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
  526                         fail |= 0x04;
  527         }
  528         rate = ieee80211_fix_rate(ni, &ni->ni_rates,
  529              IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
  530         if (rate & IEEE80211_RATE_BASIC)
  531                 fail |= 0x08;
  532         if (vap->iv_des_nssid != 0 &&
  533             !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
  534                 fail |= 0x10;
  535         if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
  536             !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
  537                 fail |= 0x20;
  538 
  539         printf(" %c %s", fail ? '-' : '+', ether_sprintf(ni->ni_macaddr));
  540         printf(" %s%c", ether_sprintf(ni->ni_bssid), fail & 0x20 ? '!' : ' ');
  541         printf(" %3d%c",
  542             ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' ');
  543         printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
  544             fail & 0x08 ? '!' : ' ');
  545         printf(" %4s%c",
  546             (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
  547             (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
  548             "????",
  549             fail & 0x02 ? '!' : ' ');
  550         printf(" %3s%c ",
  551             (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?  "wep" : "no",
  552             fail & 0x04 ? '!' : ' ');
  553         ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
  554         printf("%s\n", fail & 0x10 ? "!" : "");
  555 }
  556 #endif /* IEEE80211_DEBUG */
  557  
  558 /*
  559  * Handle 802.11 ad hoc network merge.  The
  560  * convention, set by the Wireless Ethernet Compatibility Alliance
  561  * (WECA), is that an 802.11 station will change its BSSID to match
  562  * the "oldest" 802.11 ad hoc network, on the same channel, that
  563  * has the station's desired SSID.  The "oldest" 802.11 network
  564  * sends beacons with the greatest TSF timestamp.
  565  *
  566  * The caller is assumed to validate TSF's before attempting a merge.
  567  *
  568  * Return !0 if the BSSID changed, 0 otherwise.
  569  */
  570 int
  571 ieee80211_ibss_merge(struct ieee80211_node *ni)
  572 {
  573         struct ieee80211vap *vap = ni->ni_vap;
  574 #ifdef IEEE80211_DEBUG
  575         struct ieee80211com *ic = ni->ni_ic;
  576 #endif
  577 
  578         if (ni == vap->iv_bss ||
  579             IEEE80211_ADDR_EQ(ni->ni_bssid, vap->iv_bss->ni_bssid)) {
  580                 /* unchanged, nothing to do */
  581                 return 0;
  582         }
  583         if (!check_bss(vap, ni)) {
  584                 /* capabilities mismatch */
  585                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
  586                     "%s: merge failed, capabilities mismatch\n", __func__);
  587 #ifdef IEEE80211_DEBUG
  588                 if (ieee80211_msg_assoc(vap))
  589                         check_bss_debug(vap, ni);
  590 #endif
  591                 vap->iv_stats.is_ibss_capmismatch++;
  592                 return 0;
  593         }
  594         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
  595                 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__,
  596                 ether_sprintf(ni->ni_bssid),
  597                 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
  598                 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
  599                 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : ""
  600         );
  601         return ieee80211_sta_join1(ieee80211_ref_node(ni));
  602 }
  603 
  604 /*
  605  * Calculate HT channel promotion flags for all vaps.
  606  * This assumes ni_chan have been setup for each vap.
  607  */
  608 static int
  609 gethtadjustflags(struct ieee80211com *ic)
  610 {
  611         struct ieee80211vap *vap;
  612         int flags;
  613 
  614         flags = 0;
  615         /* XXX locking */
  616         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  617                 if (vap->iv_state < IEEE80211_S_RUN)
  618                         continue;
  619                 switch (vap->iv_opmode) {
  620                 case IEEE80211_M_WDS:
  621                 case IEEE80211_M_STA:
  622                 case IEEE80211_M_AHDEMO:
  623                 case IEEE80211_M_HOSTAP:
  624                 case IEEE80211_M_IBSS:
  625                 case IEEE80211_M_MBSS:
  626                         flags |= ieee80211_htchanflags(vap->iv_bss->ni_chan);
  627                         break;
  628                 default:
  629                         break;
  630                 }
  631         }
  632         return flags;
  633 }
  634 
  635 /*
  636  * Check if the current channel needs to change based on whether
  637  * any vap's are using HT20/HT40.  This is used to sync the state
  638  * of ic_curchan after a channel width change on a running vap.
  639  */
  640 void
  641 ieee80211_sync_curchan(struct ieee80211com *ic)
  642 {
  643         struct ieee80211_channel *c;
  644 
  645         c = ieee80211_ht_adjust_channel(ic, ic->ic_curchan, gethtadjustflags(ic));
  646         if (c != ic->ic_curchan) {
  647                 ic->ic_curchan = c;
  648                 ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
  649                 ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  650                 IEEE80211_UNLOCK(ic);
  651                 ic->ic_set_channel(ic);
  652                 ieee80211_radiotap_chan_change(ic);
  653                 IEEE80211_LOCK(ic);
  654         }
  655 }
  656 
  657 /*
  658  * Setup the current channel.  The request channel may be
  659  * promoted if other vap's are operating with HT20/HT40.
  660  */
  661 void
  662 ieee80211_setupcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
  663 {
  664         if (ic->ic_htcaps & IEEE80211_HTC_HT) {
  665                 int flags = gethtadjustflags(ic);
  666                 /*
  667                  * Check for channel promotion required to support the
  668                  * set of running vap's.  This assumes we are called
  669                  * after ni_chan is setup for each vap.
  670                  */
  671                 /* NB: this assumes IEEE80211_FHT_USEHT40 > IEEE80211_FHT_HT */
  672                 if (flags > ieee80211_htchanflags(c))
  673                         c = ieee80211_ht_adjust_channel(ic, c, flags);
  674         }
  675         ic->ic_bsschan = ic->ic_curchan = c;
  676         ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
  677         ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  678 }
  679 
  680 /*
  681  * Change the current channel.  The channel change is guaranteed to have
  682  * happened before the next state change.
  683  */
  684 void
  685 ieee80211_setcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
  686 {
  687         ieee80211_setupcurchan(ic, c);
  688         ieee80211_runtask(ic, &ic->ic_chan_task);
  689 }
  690 
  691 /*
  692  * Join the specified IBSS/BSS network.  The node is assumed to
  693  * be passed in with a held reference.
  694  */
  695 static int
  696 ieee80211_sta_join1(struct ieee80211_node *selbs)
  697 {
  698         struct ieee80211vap *vap = selbs->ni_vap;
  699         struct ieee80211com *ic = selbs->ni_ic;
  700         struct ieee80211_node *obss;
  701         int canreassoc;
  702 
  703         /*
  704          * Committed to selbs, setup state.
  705          */
  706         obss = vap->iv_bss;
  707         /*
  708          * Check if old+new node have the same address in which
  709          * case we can reassociate when operating in sta mode.
  710          */
  711         canreassoc = (obss != NULL &&
  712                 vap->iv_state == IEEE80211_S_RUN &&
  713                 IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr));
  714         vap->iv_bss = selbs;            /* NB: caller assumed to bump refcnt */
  715         if (obss != NULL) {
  716                 copy_bss(selbs, obss);
  717                 ieee80211_node_decref(obss);    /* iv_bss reference */
  718                 ieee80211_free_node(obss);      /* station table reference */
  719                 obss = NULL;            /* NB: guard against later use */
  720         }
  721 
  722         /*
  723          * Delete unusable rates; we've already checked
  724          * that the negotiated rate set is acceptable.
  725          */
  726         ieee80211_fix_rate(vap->iv_bss, &vap->iv_bss->ni_rates,
  727                 IEEE80211_F_DODEL | IEEE80211_F_JOIN);
  728 
  729         ieee80211_setcurchan(ic, selbs->ni_chan);
  730         /*
  731          * Set the erp state (mostly the slot time) to deal with
  732          * the auto-select case; this should be redundant if the
  733          * mode is locked.
  734          */ 
  735         ieee80211_reset_erp(ic);
  736         ieee80211_wme_initparams(vap);
  737 
  738         if (vap->iv_opmode == IEEE80211_M_STA) {
  739                 if (canreassoc) {
  740                         /* Reassociate */
  741                         ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
  742                 } else {
  743                         /*
  744                          * Act as if we received a DEAUTH frame in case we
  745                          * are invoked from the RUN state.  This will cause
  746                          * us to try to re-authenticate if we are operating
  747                          * as a station.
  748                          */
  749                         ieee80211_new_state(vap, IEEE80211_S_AUTH,
  750                                 IEEE80211_FC0_SUBTYPE_DEAUTH);
  751                 }
  752         } else
  753                 ieee80211_new_state(vap, IEEE80211_S_RUN, -1);
  754         return 1;
  755 }
  756 
  757 int
  758 ieee80211_sta_join(struct ieee80211vap *vap, struct ieee80211_channel *chan,
  759         const struct ieee80211_scan_entry *se)
  760 {
  761         struct ieee80211com *ic = vap->iv_ic;
  762         struct ieee80211_node *ni;
  763 
  764         ni = ieee80211_alloc_node(&ic->ic_sta, vap, se->se_macaddr);
  765         if (ni == NULL) {
  766                 /* XXX msg */
  767                 return 0;
  768         }
  769         /*
  770          * Expand scan state into node's format.
  771          * XXX may not need all this stuff
  772          */
  773         IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
  774         ni->ni_esslen = se->se_ssid[1];
  775         memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen);
  776         ni->ni_tstamp.tsf = se->se_tstamp.tsf;
  777         ni->ni_intval = se->se_intval;
  778         ni->ni_capinfo = se->se_capinfo;
  779         ni->ni_chan = chan;
  780         ni->ni_timoff = se->se_timoff;
  781         ni->ni_fhdwell = se->se_fhdwell;
  782         ni->ni_fhindex = se->se_fhindex;
  783         ni->ni_erp = se->se_erp;
  784         IEEE80211_RSSI_LPF(ni->ni_avgrssi, se->se_rssi);
  785         ni->ni_noise = se->se_noise;
  786         if (vap->iv_opmode == IEEE80211_M_STA) {
  787                 /* NB: only infrastructure mode requires an associd */
  788                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
  789         }
  790 
  791         if (ieee80211_ies_init(&ni->ni_ies, se->se_ies.data, se->se_ies.len)) {
  792                 ieee80211_ies_expand(&ni->ni_ies);
  793 #ifdef IEEE80211_SUPPORT_SUPERG
  794                 if (ni->ni_ies.ath_ie != NULL)
  795                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
  796 #endif
  797                 if (ni->ni_ies.htcap_ie != NULL)
  798                         ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
  799                 if (ni->ni_ies.htinfo_ie != NULL)
  800                         ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
  801 #ifdef IEEE80211_SUPPORT_MESH
  802                 if (ni->ni_ies.meshid_ie != NULL)
  803                         ieee80211_parse_meshid(ni, ni->ni_ies.meshid_ie);
  804 #endif
  805 #ifdef IEEE80211_SUPPORT_TDMA
  806                 if (ni->ni_ies.tdma_ie != NULL)
  807                         ieee80211_parse_tdma(ni, ni->ni_ies.tdma_ie);
  808 #endif
  809         }
  810 
  811         vap->iv_dtim_period = se->se_dtimperiod;
  812         vap->iv_dtim_count = 0;
  813 
  814         /* NB: must be after ni_chan is setup */
  815         ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
  816                 IEEE80211_F_DOSORT);
  817         if (ieee80211_iserp_rateset(&ni->ni_rates))
  818                 ni->ni_flags |= IEEE80211_NODE_ERP;
  819         ieee80211_node_setuptxparms(ni);
  820         ieee80211_ratectl_node_init(ni);
  821 
  822         return ieee80211_sta_join1(ieee80211_ref_node(ni));
  823 }
  824 
  825 /*
  826  * Leave the specified IBSS/BSS network.  The node is assumed to
  827  * be passed in with a held reference.
  828  */
  829 void
  830 ieee80211_sta_leave(struct ieee80211_node *ni)
  831 {
  832         struct ieee80211com *ic = ni->ni_ic;
  833 
  834         ic->ic_node_cleanup(ni);
  835         ieee80211_notify_node_leave(ni);
  836 }
  837 
  838 /*
  839  * Send a deauthenticate frame and drop the station.
  840  */
  841 void
  842 ieee80211_node_deauth(struct ieee80211_node *ni, int reason)
  843 {
  844         /* NB: bump the refcnt to be sure temporay nodes are not reclaimed */
  845         ieee80211_ref_node(ni);
  846         if (ni->ni_associd != 0)
  847                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
  848         ieee80211_node_leave(ni);
  849         ieee80211_free_node(ni);
  850 }
  851 
  852 static struct ieee80211_node *
  853 node_alloc(struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
  854 {
  855         struct ieee80211_node *ni;
  856 
  857         ni = (struct ieee80211_node *) malloc(sizeof(struct ieee80211_node),
  858                 M_80211_NODE, M_NOWAIT | M_ZERO);
  859         return ni;
  860 }
  861 
  862 /*
  863  * Initialize an ie blob with the specified data.  If previous
  864  * data exists re-use the data block.  As a side effect we clear
  865  * all references to specific ie's; the caller is required to
  866  * recalculate them.
  867  */
  868 int
  869 ieee80211_ies_init(struct ieee80211_ies *ies, const uint8_t *data, int len)
  870 {
  871         /* NB: assumes data+len are the last fields */
  872         memset(ies, 0, offsetof(struct ieee80211_ies, data));
  873         if (ies->data != NULL && ies->len != len) {
  874                 /* data size changed */
  875                 free(ies->data, M_80211_NODE_IE);
  876                 ies->data = NULL;
  877         }
  878         if (ies->data == NULL) {
  879                 ies->data = (uint8_t *) malloc(len, M_80211_NODE_IE, M_NOWAIT);
  880                 if (ies->data == NULL) {
  881                         ies->len = 0;
  882                         /* NB: pointers have already been zero'd above */
  883                         return 0;
  884                 }
  885         }
  886         memcpy(ies->data, data, len);
  887         ies->len = len;
  888         return 1;
  889 }
  890 
  891 /*
  892  * Reclaim storage for an ie blob.
  893  */
  894 void
  895 ieee80211_ies_cleanup(struct ieee80211_ies *ies)
  896 {
  897         if (ies->data != NULL)
  898                 free(ies->data, M_80211_NODE_IE);
  899 }
  900 
  901 /*
  902  * Expand an ie blob data contents and to fillin individual
  903  * ie pointers.  The data blob is assumed to be well-formed;
  904  * we don't do any validity checking of ie lengths.
  905  */
  906 void
  907 ieee80211_ies_expand(struct ieee80211_ies *ies)
  908 {
  909         uint8_t *ie;
  910         int ielen;
  911 
  912         ie = ies->data;
  913         ielen = ies->len;
  914         while (ielen > 0) {
  915                 switch (ie[0]) {
  916                 case IEEE80211_ELEMID_VENDOR:
  917                         if (iswpaoui(ie))
  918                                 ies->wpa_ie = ie;
  919                         else if (iswmeoui(ie))
  920                                 ies->wme_ie = ie;
  921 #ifdef IEEE80211_SUPPORT_SUPERG
  922                         else if (isatherosoui(ie))
  923                                 ies->ath_ie = ie;
  924 #endif
  925 #ifdef IEEE80211_SUPPORT_TDMA
  926                         else if (istdmaoui(ie))
  927                                 ies->tdma_ie = ie;
  928 #endif
  929                         break;
  930                 case IEEE80211_ELEMID_RSN:
  931                         ies->rsn_ie = ie;
  932                         break;
  933                 case IEEE80211_ELEMID_HTCAP:
  934                         ies->htcap_ie = ie;
  935                         break;
  936 #ifdef IEEE80211_SUPPORT_MESH
  937                 case IEEE80211_ELEMID_MESHID:
  938                         ies->meshid_ie = ie;
  939                         break;
  940 #endif
  941                 }
  942                 ielen -= 2 + ie[1];
  943                 ie += 2 + ie[1];
  944         }
  945 }
  946 
  947 /*
  948  * Reclaim any resources in a node and reset any critical
  949  * state.  Typically nodes are free'd immediately after,
  950  * but in some cases the storage may be reused so we need
  951  * to insure consistent state (should probably fix that).
  952  */
  953 static void
  954 node_cleanup(struct ieee80211_node *ni)
  955 {
  956 #define N(a)    (sizeof(a)/sizeof(a[0]))
  957         struct ieee80211vap *vap = ni->ni_vap;
  958         struct ieee80211com *ic = ni->ni_ic;
  959         int i;
  960 
  961         /* NB: preserve ni_table */
  962         if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
  963                 if (vap->iv_opmode != IEEE80211_M_STA)
  964                         vap->iv_ps_sta--;
  965                 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  966                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  967                     "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
  968         }
  969         /*
  970          * Cleanup any HT-related state.
  971          */
  972         if (ni->ni_flags & IEEE80211_NODE_HT)
  973                 ieee80211_ht_node_cleanup(ni);
  974 #ifdef IEEE80211_SUPPORT_SUPERG
  975         else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
  976                 ieee80211_ff_node_cleanup(ni);
  977 #endif
  978 #ifdef IEEE80211_SUPPORT_MESH
  979         /*
  980          * Cleanup any mesh-related state.
  981          */
  982         if (vap->iv_opmode == IEEE80211_M_MBSS)
  983                 ieee80211_mesh_node_cleanup(ni);
  984 #endif
  985         /*
  986          * Clear any staging queue entries.
  987          */
  988         ieee80211_ageq_drain_node(&ic->ic_stageq, ni);
  989 
  990         /*
  991          * Clear AREF flag that marks the authorization refcnt bump
  992          * has happened.  This is probably not needed as the node
  993          * should always be removed from the table so not found but
  994          * do it just in case.
  995          * Likewise clear the ASSOCID flag as these flags are intended
  996          * to be managed in tandem.
  997          */
  998         ni->ni_flags &= ~(IEEE80211_NODE_AREF | IEEE80211_NODE_ASSOCID);
  999 
 1000         /*
 1001          * Drain power save queue and, if needed, clear TIM.
 1002          */
 1003         if (ieee80211_node_psq_drain(ni) != 0 && vap->iv_set_tim != NULL)
 1004                 vap->iv_set_tim(ni, 0);
 1005 
 1006         ni->ni_associd = 0;
 1007         if (ni->ni_challenge != NULL) {
 1008                 free(ni->ni_challenge, M_80211_NODE);
 1009                 ni->ni_challenge = NULL;
 1010         }
 1011         /*
 1012          * Preserve SSID, WPA, and WME ie's so the bss node is
 1013          * reusable during a re-auth/re-assoc state transition.
 1014          * If we remove these data they will not be recreated
 1015          * because they come from a probe-response or beacon frame
 1016          * which cannot be expected prior to the association-response.
 1017          * This should not be an issue when operating in other modes
 1018          * as stations leaving always go through a full state transition
 1019          * which will rebuild this state.
 1020          *
 1021          * XXX does this leave us open to inheriting old state?
 1022          */
 1023         for (i = 0; i < N(ni->ni_rxfrag); i++)
 1024                 if (ni->ni_rxfrag[i] != NULL) {
 1025                         m_freem(ni->ni_rxfrag[i]);
 1026                         ni->ni_rxfrag[i] = NULL;
 1027                 }
 1028         /*
 1029          * Must be careful here to remove any key map entry w/o a LOR.
 1030          */
 1031         ieee80211_node_delucastkey(ni);
 1032 #undef N
 1033 }
 1034 
 1035 static void
 1036 node_free(struct ieee80211_node *ni)
 1037 {
 1038         struct ieee80211com *ic = ni->ni_ic;
 1039 
 1040         ieee80211_ratectl_node_deinit(ni);
 1041         ic->ic_node_cleanup(ni);
 1042         ieee80211_ies_cleanup(&ni->ni_ies);
 1043         ieee80211_psq_cleanup(&ni->ni_psq);
 1044         free(ni, M_80211_NODE);
 1045 }
 1046 
 1047 static void
 1048 node_age(struct ieee80211_node *ni)
 1049 {
 1050         struct ieee80211vap *vap = ni->ni_vap;
 1051 
 1052         IEEE80211_NODE_LOCK_ASSERT(&vap->iv_ic->ic_sta);
 1053 
 1054         /*
 1055          * Age frames on the power save queue.
 1056          */
 1057         if (ieee80211_node_psq_age(ni) != 0 &&
 1058             ni->ni_psq.psq_len == 0 && vap->iv_set_tim != NULL)
 1059                 vap->iv_set_tim(ni, 0);
 1060         /*
 1061          * Age out HT resources (e.g. frames on the
 1062          * A-MPDU reorder queues).
 1063          */
 1064         if (ni->ni_associd != 0 && (ni->ni_flags & IEEE80211_NODE_HT))
 1065                 ieee80211_ht_node_age(ni);
 1066 }
 1067 
 1068 static int8_t
 1069 node_getrssi(const struct ieee80211_node *ni)
 1070 {
 1071         uint32_t avgrssi = ni->ni_avgrssi;
 1072         int32_t rssi;
 1073 
 1074         if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER)
 1075                 return 0;
 1076         rssi = IEEE80211_RSSI_GET(avgrssi);
 1077         return rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
 1078 }
 1079 
 1080 static void
 1081 node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise)
 1082 {
 1083         *rssi = node_getrssi(ni);
 1084         *noise = ni->ni_noise;
 1085 }
 1086 
 1087 static void
 1088 node_getmimoinfo(const struct ieee80211_node *ni,
 1089         struct ieee80211_mimo_info *info)
 1090 {
 1091         /* XXX zero data? */
 1092 }
 1093 
 1094 struct ieee80211_node *
 1095 ieee80211_alloc_node(struct ieee80211_node_table *nt,
 1096         struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1097 {
 1098         struct ieee80211com *ic = nt->nt_ic;
 1099         struct ieee80211_node *ni;
 1100         int hash;
 1101 
 1102         ni = ic->ic_node_alloc(vap, macaddr);
 1103         if (ni == NULL) {
 1104                 vap->iv_stats.is_rx_nodealloc++;
 1105                 return NULL;
 1106         }
 1107 
 1108         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1109                 "%s %p<%s> in %s table\n", __func__, ni,
 1110                 ether_sprintf(macaddr), nt->nt_name);
 1111 
 1112         IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
 1113         hash = IEEE80211_NODE_HASH(ic, macaddr);
 1114         ieee80211_node_initref(ni);             /* mark referenced */
 1115         ni->ni_chan = IEEE80211_CHAN_ANYC;
 1116         ni->ni_authmode = IEEE80211_AUTH_OPEN;
 1117         ni->ni_txpower = ic->ic_txpowlimit;     /* max power */
 1118         ni->ni_txparms = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
 1119         ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
 1120         ni->ni_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
 1121         ni->ni_inact_reload = nt->nt_inact_init;
 1122         ni->ni_inact = ni->ni_inact_reload;
 1123         ni->ni_ath_defkeyix = 0x7fff;
 1124         ieee80211_psq_init(&ni->ni_psq, "unknown");
 1125 #ifdef IEEE80211_SUPPORT_MESH
 1126         if (vap->iv_opmode == IEEE80211_M_MBSS)
 1127                 ieee80211_mesh_node_init(vap, ni);
 1128 #endif
 1129         IEEE80211_NODE_LOCK(nt);
 1130         TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
 1131         LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
 1132         ni->ni_table = nt;
 1133         ni->ni_vap = vap;
 1134         ni->ni_ic = ic;
 1135         IEEE80211_NODE_UNLOCK(nt);
 1136 
 1137         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 1138             "%s: inact_reload %u", __func__, ni->ni_inact_reload);
 1139 
 1140         ieee80211_ratectl_node_init(ni);
 1141 
 1142         return ni;
 1143 }
 1144 
 1145 /*
 1146  * Craft a temporary node suitable for sending a management frame
 1147  * to the specified station.  We craft only as much state as we
 1148  * need to do the work since the node will be immediately reclaimed
 1149  * once the send completes.
 1150  */
 1151 struct ieee80211_node *
 1152 ieee80211_tmp_node(struct ieee80211vap *vap,
 1153         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1154 {
 1155         struct ieee80211com *ic = vap->iv_ic;
 1156         struct ieee80211_node *ni;
 1157 
 1158         ni = ic->ic_node_alloc(vap, macaddr);
 1159         if (ni != NULL) {
 1160                 struct ieee80211_node *bss = vap->iv_bss;
 1161 
 1162                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1163                         "%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
 1164 
 1165                 ni->ni_table = NULL;            /* NB: pedantic */
 1166                 ni->ni_ic = ic;                 /* NB: needed to set channel */
 1167                 ni->ni_vap = vap;
 1168 
 1169                 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
 1170                 IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
 1171                 ieee80211_node_initref(ni);             /* mark referenced */
 1172                 /* NB: required by ieee80211_fix_rate */
 1173                 ieee80211_node_set_chan(ni, bss->ni_chan);
 1174                 ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
 1175                         IEEE80211_KEYIX_NONE);
 1176                 ni->ni_txpower = bss->ni_txpower;
 1177                 /* XXX optimize away */
 1178                 ieee80211_psq_init(&ni->ni_psq, "unknown");
 1179 
 1180                 ieee80211_ratectl_node_init(ni);
 1181         } else {
 1182                 /* XXX msg */
 1183                 vap->iv_stats.is_rx_nodealloc++;
 1184         }
 1185         return ni;
 1186 }
 1187 
 1188 struct ieee80211_node *
 1189 ieee80211_dup_bss(struct ieee80211vap *vap,
 1190         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1191 {
 1192         struct ieee80211com *ic = vap->iv_ic;
 1193         struct ieee80211_node *ni;
 1194 
 1195         ni = ieee80211_alloc_node(&ic->ic_sta, vap, macaddr);
 1196         if (ni != NULL) {
 1197                 struct ieee80211_node *bss = vap->iv_bss;
 1198                 /*
 1199                  * Inherit from iv_bss.
 1200                  */
 1201                 copy_bss(ni, bss);
 1202                 IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
 1203                 ieee80211_node_set_chan(ni, bss->ni_chan);
 1204         }
 1205         return ni;
 1206 }
 1207 
 1208 /*
 1209  * Create a bss node for a legacy WDS vap.  The far end does
 1210  * not associate so we just create create a new node and
 1211  * simulate an association.  The caller is responsible for
 1212  * installing the node as the bss node and handling any further
 1213  * setup work like authorizing the port.
 1214  */
 1215 struct ieee80211_node *
 1216 ieee80211_node_create_wds(struct ieee80211vap *vap,
 1217         const uint8_t bssid[IEEE80211_ADDR_LEN], struct ieee80211_channel *chan)
 1218 {
 1219         struct ieee80211com *ic = vap->iv_ic;
 1220         struct ieee80211_node *ni;
 1221 
 1222         /* XXX check if node already in sta table? */
 1223         ni = ieee80211_alloc_node(&ic->ic_sta, vap, bssid);
 1224         if (ni != NULL) {
 1225                 ni->ni_wdsvap = vap;
 1226                 IEEE80211_ADDR_COPY(ni->ni_bssid, bssid);
 1227                 /*
 1228                  * Inherit any manually configured settings.
 1229                  */
 1230                 copy_bss(ni, vap->iv_bss);
 1231                 ieee80211_node_set_chan(ni, chan);
 1232                 /* NB: propagate ssid so available to WPA supplicant */
 1233                 ni->ni_esslen = vap->iv_des_ssid[0].len;
 1234                 memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
 1235                 /* NB: no associd for peer */
 1236                 /*
 1237                  * There are no management frames to use to
 1238                  * discover neighbor capabilities, so blindly
 1239                  * propagate the local configuration.
 1240                  */
 1241                 if (vap->iv_flags & IEEE80211_F_WME)
 1242                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1243 #ifdef IEEE80211_SUPPORT_SUPERG
 1244                 if (vap->iv_flags & IEEE80211_F_FF)
 1245                         ni->ni_flags |= IEEE80211_NODE_FF;
 1246 #endif
 1247                 if ((ic->ic_htcaps & IEEE80211_HTC_HT) &&
 1248                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1249                         /*
 1250                          * Device is HT-capable and HT is enabled for
 1251                          * the vap; setup HT operation.  On return
 1252                          * ni_chan will be adjusted to an HT channel.
 1253                          */
 1254                         ieee80211_ht_wds_init(ni);
 1255                 } else {
 1256                         struct ieee80211_channel *c = ni->ni_chan;
 1257                         /*
 1258                          * Force a legacy channel to be used.
 1259                          */
 1260                         c = ieee80211_find_channel(ic,
 1261                             c->ic_freq, c->ic_flags &~ IEEE80211_CHAN_HT);
 1262                         KASSERT(c != NULL, ("no legacy channel, %u/%x",
 1263                             ni->ni_chan->ic_freq, ni->ni_chan->ic_flags));
 1264                         ni->ni_chan = c;
 1265                 }
 1266         }
 1267         return ni;
 1268 }
 1269 
 1270 struct ieee80211_node *
 1271 #ifdef IEEE80211_DEBUG_REFCNT
 1272 ieee80211_find_node_locked_debug(struct ieee80211_node_table *nt,
 1273         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1274 #else
 1275 ieee80211_find_node_locked(struct ieee80211_node_table *nt,
 1276         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1277 #endif
 1278 {
 1279         struct ieee80211_node *ni;
 1280         int hash;
 1281 
 1282         IEEE80211_NODE_LOCK_ASSERT(nt);
 1283 
 1284         hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
 1285         LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
 1286                 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
 1287                         ieee80211_ref_node(ni); /* mark referenced */
 1288 #ifdef IEEE80211_DEBUG_REFCNT
 1289                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1290                             "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
 1291                             func, line,
 1292                             ni, ether_sprintf(ni->ni_macaddr),
 1293                             ieee80211_node_refcnt(ni));
 1294 #endif
 1295                         return ni;
 1296                 }
 1297         }
 1298         return NULL;
 1299 }
 1300 
 1301 struct ieee80211_node *
 1302 #ifdef IEEE80211_DEBUG_REFCNT
 1303 ieee80211_find_node_debug(struct ieee80211_node_table *nt,
 1304         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1305 #else
 1306 ieee80211_find_node(struct ieee80211_node_table *nt,
 1307         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1308 #endif
 1309 {
 1310         struct ieee80211_node *ni;
 1311 
 1312         IEEE80211_NODE_LOCK(nt);
 1313         ni = ieee80211_find_node_locked(nt, macaddr);
 1314         IEEE80211_NODE_UNLOCK(nt);
 1315         return ni;
 1316 }
 1317 
 1318 struct ieee80211_node *
 1319 #ifdef IEEE80211_DEBUG_REFCNT
 1320 ieee80211_find_vap_node_locked_debug(struct ieee80211_node_table *nt,
 1321         const struct ieee80211vap *vap,
 1322         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1323 #else
 1324 ieee80211_find_vap_node_locked(struct ieee80211_node_table *nt,
 1325         const struct ieee80211vap *vap,
 1326         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1327 #endif
 1328 {
 1329         struct ieee80211_node *ni;
 1330         int hash;
 1331 
 1332         IEEE80211_NODE_LOCK_ASSERT(nt);
 1333 
 1334         hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
 1335         LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
 1336                 if (ni->ni_vap == vap &&
 1337                     IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
 1338                         ieee80211_ref_node(ni); /* mark referenced */
 1339 #ifdef IEEE80211_DEBUG_REFCNT
 1340                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1341                             "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
 1342                             func, line,
 1343                             ni, ether_sprintf(ni->ni_macaddr),
 1344                             ieee80211_node_refcnt(ni));
 1345 #endif
 1346                         return ni;
 1347                 }
 1348         }
 1349         return NULL;
 1350 }
 1351 
 1352 struct ieee80211_node *
 1353 #ifdef IEEE80211_DEBUG_REFCNT
 1354 ieee80211_find_vap_node_debug(struct ieee80211_node_table *nt,
 1355         const struct ieee80211vap *vap,
 1356         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1357 #else
 1358 ieee80211_find_vap_node(struct ieee80211_node_table *nt,
 1359         const struct ieee80211vap *vap,
 1360         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1361 #endif
 1362 {
 1363         struct ieee80211_node *ni;
 1364 
 1365         IEEE80211_NODE_LOCK(nt);
 1366         ni = ieee80211_find_vap_node_locked(nt, vap, macaddr);
 1367         IEEE80211_NODE_UNLOCK(nt);
 1368         return ni;
 1369 }
 1370 
 1371 /*
 1372  * Fake up a node; this handles node discovery in adhoc mode.
 1373  * Note that for the driver's benefit we we treat this like
 1374  * an association so the driver has an opportunity to setup
 1375  * it's private state.
 1376  */
 1377 struct ieee80211_node *
 1378 ieee80211_fakeup_adhoc_node(struct ieee80211vap *vap,
 1379         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1380 {
 1381         struct ieee80211_node *ni;
 1382 
 1383         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1384             "%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
 1385         ni = ieee80211_dup_bss(vap, macaddr);
 1386         if (ni != NULL) {
 1387                 struct ieee80211com *ic = vap->iv_ic;
 1388 
 1389                 /* XXX no rate negotiation; just dup */
 1390                 ni->ni_rates = vap->iv_bss->ni_rates;
 1391                 if (ieee80211_iserp_rateset(&ni->ni_rates))
 1392                         ni->ni_flags |= IEEE80211_NODE_ERP;
 1393                 if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
 1394                         /*
 1395                          * In adhoc demo mode there are no management
 1396                          * frames to use to discover neighbor capabilities,
 1397                          * so blindly propagate the local configuration 
 1398                          * so we can do interesting things (e.g. use
 1399                          * WME to disable ACK's).
 1400                          */
 1401                         if (vap->iv_flags & IEEE80211_F_WME)
 1402                                 ni->ni_flags |= IEEE80211_NODE_QOS;
 1403 #ifdef IEEE80211_SUPPORT_SUPERG
 1404                         if (vap->iv_flags & IEEE80211_F_FF)
 1405                                 ni->ni_flags |= IEEE80211_NODE_FF;
 1406 #endif
 1407                 }
 1408                 ieee80211_node_setuptxparms(ni);
 1409                 ieee80211_ratectl_node_init(ni);
 1410                 if (ic->ic_newassoc != NULL)
 1411                         ic->ic_newassoc(ni, 1);
 1412                 /* XXX not right for 802.1x/WPA */
 1413                 ieee80211_node_authorize(ni);
 1414         }
 1415         return ni;
 1416 }
 1417 
 1418 void
 1419 ieee80211_init_neighbor(struct ieee80211_node *ni,
 1420         const struct ieee80211_frame *wh,
 1421         const struct ieee80211_scanparams *sp)
 1422 {
 1423         ni->ni_esslen = sp->ssid[1];
 1424         memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
 1425         IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
 1426         memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
 1427         ni->ni_intval = sp->bintval;
 1428         ni->ni_capinfo = sp->capinfo;
 1429         ni->ni_chan = ni->ni_ic->ic_curchan;
 1430         ni->ni_fhdwell = sp->fhdwell;
 1431         ni->ni_fhindex = sp->fhindex;
 1432         ni->ni_erp = sp->erp;
 1433         ni->ni_timoff = sp->timoff;
 1434 #ifdef IEEE80211_SUPPORT_MESH
 1435         if (ni->ni_vap->iv_opmode == IEEE80211_M_MBSS)
 1436                 ieee80211_mesh_init_neighbor(ni, wh, sp);
 1437 #endif
 1438         if (ieee80211_ies_init(&ni->ni_ies, sp->ies, sp->ies_len)) {
 1439                 ieee80211_ies_expand(&ni->ni_ies);
 1440                 if (ni->ni_ies.wme_ie != NULL)
 1441                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1442                 else
 1443                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
 1444 #ifdef IEEE80211_SUPPORT_SUPERG
 1445                 if (ni->ni_ies.ath_ie != NULL)
 1446                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
 1447 #endif
 1448         }
 1449 
 1450         /* NB: must be after ni_chan is setup */
 1451         ieee80211_setup_rates(ni, sp->rates, sp->xrates,
 1452                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1453                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1454 }
 1455 
 1456 /*
 1457  * Do node discovery in adhoc mode on receipt of a beacon
 1458  * or probe response frame.  Note that for the driver's
 1459  * benefit we we treat this like an association so the
 1460  * driver has an opportunity to setup it's private state.
 1461  */
 1462 struct ieee80211_node *
 1463 ieee80211_add_neighbor(struct ieee80211vap *vap,
 1464         const struct ieee80211_frame *wh,
 1465         const struct ieee80211_scanparams *sp)
 1466 {
 1467         struct ieee80211_node *ni;
 1468 
 1469         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1470             "%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
 1471         ni = ieee80211_dup_bss(vap, wh->i_addr2);/* XXX alloc_node? */
 1472         if (ni != NULL) {
 1473                 struct ieee80211com *ic = vap->iv_ic;
 1474 
 1475                 ieee80211_init_neighbor(ni, wh, sp);
 1476                 if (ieee80211_iserp_rateset(&ni->ni_rates))
 1477                         ni->ni_flags |= IEEE80211_NODE_ERP;
 1478                 ieee80211_node_setuptxparms(ni);
 1479                 ieee80211_ratectl_node_init(ni);
 1480                 if (ic->ic_newassoc != NULL)
 1481                         ic->ic_newassoc(ni, 1);
 1482                 /* XXX not right for 802.1x/WPA */
 1483                 ieee80211_node_authorize(ni);
 1484         }
 1485         return ni;
 1486 }
 1487 
 1488 #define IS_PROBEREQ(wh) \
 1489         ((wh->i_fc[0] & (IEEE80211_FC0_TYPE_MASK|IEEE80211_FC0_SUBTYPE_MASK)) \
 1490             == (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ))
 1491 #define IS_BCAST_PROBEREQ(wh) \
 1492         (IS_PROBEREQ(wh) && IEEE80211_IS_MULTICAST( \
 1493             ((const struct ieee80211_frame *)(wh))->i_addr3))
 1494 
 1495 static __inline struct ieee80211_node *
 1496 _find_rxnode(struct ieee80211_node_table *nt,
 1497     const struct ieee80211_frame_min *wh)
 1498 {
 1499         if (IS_BCAST_PROBEREQ(wh))
 1500                 return NULL;            /* spam bcast probe req to all vap's */
 1501         return ieee80211_find_node_locked(nt, wh->i_addr2);
 1502 }
 1503 
 1504 /*
 1505  * Locate the node for sender, track state, and then pass the
 1506  * (referenced) node up to the 802.11 layer for its use.  Note
 1507  * we can return NULL if the sender is not in the table.
 1508  */
 1509 struct ieee80211_node *
 1510 #ifdef IEEE80211_DEBUG_REFCNT
 1511 ieee80211_find_rxnode_debug(struct ieee80211com *ic,
 1512         const struct ieee80211_frame_min *wh, const char *func, int line)
 1513 #else
 1514 ieee80211_find_rxnode(struct ieee80211com *ic,
 1515         const struct ieee80211_frame_min *wh)
 1516 #endif
 1517 {
 1518         struct ieee80211_node_table *nt;
 1519         struct ieee80211_node *ni;
 1520 
 1521         nt = &ic->ic_sta;
 1522         IEEE80211_NODE_LOCK(nt);
 1523         ni = _find_rxnode(nt, wh);
 1524         IEEE80211_NODE_UNLOCK(nt);
 1525 
 1526         return ni;
 1527 }
 1528 
 1529 /*
 1530  * Like ieee80211_find_rxnode but use the supplied h/w
 1531  * key index as a hint to locate the node in the key
 1532  * mapping table.  If an entry is present at the key
 1533  * index we return it; otherwise do a normal lookup and
 1534  * update the mapping table if the station has a unicast
 1535  * key assigned to it.
 1536  */
 1537 struct ieee80211_node *
 1538 #ifdef IEEE80211_DEBUG_REFCNT
 1539 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
 1540         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
 1541         const char *func, int line)
 1542 #else
 1543 ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
 1544         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
 1545 #endif
 1546 {
 1547         struct ieee80211_node_table *nt;
 1548         struct ieee80211_node *ni;
 1549 
 1550         nt = &ic->ic_sta;
 1551         IEEE80211_NODE_LOCK(nt);
 1552         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
 1553                 ni = nt->nt_keyixmap[keyix];
 1554         else
 1555                 ni = NULL;
 1556         if (ni == NULL) {
 1557                 ni = _find_rxnode(nt, wh);
 1558                 if (ni != NULL && nt->nt_keyixmap != NULL) {
 1559                         /*
 1560                          * If the station has a unicast key cache slot
 1561                          * assigned update the key->node mapping table.
 1562                          */
 1563                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1564                         /* XXX can keyixmap[keyix] != NULL? */
 1565                         if (keyix < nt->nt_keyixmax &&
 1566                             nt->nt_keyixmap[keyix] == NULL) {
 1567                                 IEEE80211_DPRINTF(ni->ni_vap,
 1568                                     IEEE80211_MSG_NODE,
 1569                                     "%s: add key map entry %p<%s> refcnt %d\n",
 1570                                     __func__, ni, ether_sprintf(ni->ni_macaddr),
 1571                                     ieee80211_node_refcnt(ni)+1);
 1572                                 nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
 1573                         }
 1574                 }
 1575         } else {
 1576                 if (IS_BCAST_PROBEREQ(wh))
 1577                         ni = NULL;      /* spam bcast probe req to all vap's */
 1578                 else
 1579                         ieee80211_ref_node(ni);
 1580         }
 1581         IEEE80211_NODE_UNLOCK(nt);
 1582 
 1583         return ni;
 1584 }
 1585 #undef IS_BCAST_PROBEREQ
 1586 #undef IS_PROBEREQ
 1587 
 1588 /*
 1589  * Return a reference to the appropriate node for sending
 1590  * a data frame.  This handles node discovery in adhoc networks.
 1591  */
 1592 struct ieee80211_node *
 1593 #ifdef IEEE80211_DEBUG_REFCNT
 1594 ieee80211_find_txnode_debug(struct ieee80211vap *vap,
 1595         const uint8_t macaddr[IEEE80211_ADDR_LEN],
 1596         const char *func, int line)
 1597 #else
 1598 ieee80211_find_txnode(struct ieee80211vap *vap,
 1599         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1600 #endif
 1601 {
 1602         struct ieee80211_node_table *nt = &vap->iv_ic->ic_sta;
 1603         struct ieee80211_node *ni;
 1604 
 1605         /*
 1606          * The destination address should be in the node table
 1607          * unless this is a multicast/broadcast frame.  We can
 1608          * also optimize station mode operation, all frames go
 1609          * to the bss node.
 1610          */
 1611         /* XXX can't hold lock across dup_bss 'cuz of recursive locking */
 1612         IEEE80211_NODE_LOCK(nt);
 1613         if (vap->iv_opmode == IEEE80211_M_STA ||
 1614             vap->iv_opmode == IEEE80211_M_WDS ||
 1615             IEEE80211_IS_MULTICAST(macaddr))
 1616                 ni = ieee80211_ref_node(vap->iv_bss);
 1617         else
 1618                 ni = ieee80211_find_node_locked(nt, macaddr);
 1619         IEEE80211_NODE_UNLOCK(nt);
 1620 
 1621         if (ni == NULL) {
 1622                 if (vap->iv_opmode == IEEE80211_M_IBSS ||
 1623                     vap->iv_opmode == IEEE80211_M_AHDEMO) {
 1624                         /*
 1625                          * In adhoc mode cons up a node for the destination.
 1626                          * Note that we need an additional reference for the
 1627                          * caller to be consistent with
 1628                          * ieee80211_find_node_locked.
 1629                          */
 1630                         ni = ieee80211_fakeup_adhoc_node(vap, macaddr);
 1631                         if (ni != NULL)
 1632                                 (void) ieee80211_ref_node(ni);
 1633                 } else {
 1634                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, macaddr,
 1635                             "no node, discard frame (%s)", __func__);
 1636                         vap->iv_stats.is_tx_nonode++;
 1637                 }
 1638         }
 1639         return ni;
 1640 }
 1641 
 1642 static void
 1643 _ieee80211_free_node(struct ieee80211_node *ni)
 1644 {
 1645         struct ieee80211_node_table *nt = ni->ni_table;
 1646 
 1647         /*
 1648          * NB: careful about referencing the vap as it may be
 1649          * gone if the last reference was held by a driver.
 1650          * We know the com will always be present so it's safe
 1651          * to use ni_ic below to reclaim resources.
 1652          */
 1653 #if 0
 1654         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1655                 "%s %p<%s> in %s table\n", __func__, ni,
 1656                 ether_sprintf(ni->ni_macaddr),
 1657                 nt != NULL ? nt->nt_name : "<gone>");
 1658 #endif
 1659         if (ni->ni_associd != 0) {
 1660                 struct ieee80211vap *vap = ni->ni_vap;
 1661                 if (vap->iv_aid_bitmap != NULL)
 1662                         IEEE80211_AID_CLR(vap, ni->ni_associd);
 1663         }
 1664         if (nt != NULL) {
 1665                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1666                 LIST_REMOVE(ni, ni_hash);
 1667         }
 1668         ni->ni_ic->ic_node_free(ni);
 1669 }
 1670 
 1671 void
 1672 #ifdef IEEE80211_DEBUG_REFCNT
 1673 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
 1674 #else
 1675 ieee80211_free_node(struct ieee80211_node *ni)
 1676 #endif
 1677 {
 1678         struct ieee80211_node_table *nt = ni->ni_table;
 1679 
 1680 #ifdef IEEE80211_DEBUG_REFCNT
 1681         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1682                 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
 1683                  ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
 1684 #endif
 1685         if (nt != NULL) {
 1686                 IEEE80211_NODE_LOCK(nt);
 1687                 if (ieee80211_node_dectestref(ni)) {
 1688                         /*
 1689                          * Last reference, reclaim state.
 1690                          */
 1691                         _ieee80211_free_node(ni);
 1692                 } else if (ieee80211_node_refcnt(ni) == 1 &&
 1693                     nt->nt_keyixmap != NULL) {
 1694                         ieee80211_keyix keyix;
 1695                         /*
 1696                          * Check for a last reference in the key mapping table.
 1697                          */
 1698                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1699                         if (keyix < nt->nt_keyixmax &&
 1700                             nt->nt_keyixmap[keyix] == ni) {
 1701                                 IEEE80211_DPRINTF(ni->ni_vap,
 1702                                     IEEE80211_MSG_NODE,
 1703                                     "%s: %p<%s> clear key map entry", __func__,
 1704                                     ni, ether_sprintf(ni->ni_macaddr));
 1705                                 nt->nt_keyixmap[keyix] = NULL;
 1706                                 ieee80211_node_decref(ni); /* XXX needed? */
 1707                                 _ieee80211_free_node(ni);
 1708                         }
 1709                 }
 1710                 IEEE80211_NODE_UNLOCK(nt);
 1711         } else {
 1712                 if (ieee80211_node_dectestref(ni))
 1713                         _ieee80211_free_node(ni);
 1714         }
 1715 }
 1716 
 1717 /*
 1718  * Reclaim a unicast key and clear any key cache state.
 1719  */
 1720 int
 1721 ieee80211_node_delucastkey(struct ieee80211_node *ni)
 1722 {
 1723         struct ieee80211com *ic = ni->ni_ic;
 1724         struct ieee80211_node_table *nt = &ic->ic_sta;
 1725         struct ieee80211_node *nikey;
 1726         ieee80211_keyix keyix;
 1727         int isowned, status;
 1728 
 1729         /*
 1730          * NB: We must beware of LOR here; deleting the key
 1731          * can cause the crypto layer to block traffic updates
 1732          * which can generate a LOR against the node table lock;
 1733          * grab it here and stash the key index for our use below.
 1734          *
 1735          * Must also beware of recursion on the node table lock.
 1736          * When called from node_cleanup we may already have
 1737          * the node table lock held.  Unfortunately there's no
 1738          * way to separate out this path so we must do this
 1739          * conditionally.
 1740          */
 1741         isowned = IEEE80211_NODE_IS_LOCKED(nt);
 1742         if (!isowned)
 1743                 IEEE80211_NODE_LOCK(nt);
 1744         nikey = NULL;
 1745         status = 1;             /* NB: success */
 1746         if (ni->ni_ucastkey.wk_keyix != IEEE80211_KEYIX_NONE) {
 1747                 keyix = ni->ni_ucastkey.wk_rxkeyix;
 1748                 status = ieee80211_crypto_delkey(ni->ni_vap, &ni->ni_ucastkey);
 1749                 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
 1750                         nikey = nt->nt_keyixmap[keyix];
 1751                         nt->nt_keyixmap[keyix] = NULL;
 1752                 }
 1753         }
 1754         if (!isowned)
 1755                 IEEE80211_NODE_UNLOCK(nt);
 1756 
 1757         if (nikey != NULL) {
 1758                 KASSERT(nikey == ni,
 1759                         ("key map out of sync, ni %p nikey %p", ni, nikey));
 1760                 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1761                         "%s: delete key map entry %p<%s> refcnt %d\n",
 1762                         __func__, ni, ether_sprintf(ni->ni_macaddr),
 1763                         ieee80211_node_refcnt(ni)-1);
 1764                 ieee80211_free_node(ni);
 1765         }
 1766         return status;
 1767 }
 1768 
 1769 /*
 1770  * Reclaim a node.  If this is the last reference count then
 1771  * do the normal free work.  Otherwise remove it from the node
 1772  * table and mark it gone by clearing the back-reference.
 1773  */
 1774 static void
 1775 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 1776 {
 1777         ieee80211_keyix keyix;
 1778 
 1779         IEEE80211_NODE_LOCK_ASSERT(nt);
 1780 
 1781         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1782                 "%s: remove %p<%s> from %s table, refcnt %d\n",
 1783                 __func__, ni, ether_sprintf(ni->ni_macaddr),
 1784                 nt->nt_name, ieee80211_node_refcnt(ni)-1);
 1785         /*
 1786          * Clear any entry in the unicast key mapping table.
 1787          * We need to do it here so rx lookups don't find it
 1788          * in the mapping table even if it's not in the hash
 1789          * table.  We cannot depend on the mapping table entry
 1790          * being cleared because the node may not be free'd.
 1791          */
 1792         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1793         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
 1794             nt->nt_keyixmap[keyix] == ni) {
 1795                 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1796                         "%s: %p<%s> clear key map entry %u\n",
 1797                         __func__, ni, ether_sprintf(ni->ni_macaddr), keyix);
 1798                 nt->nt_keyixmap[keyix] = NULL;
 1799                 ieee80211_node_decref(ni);      /* NB: don't need free */
 1800         }
 1801         if (!ieee80211_node_dectestref(ni)) {
 1802                 /*
 1803                  * Other references are present, just remove the
 1804                  * node from the table so it cannot be found.  When
 1805                  * the references are dropped storage will be
 1806                  * reclaimed.
 1807                  */
 1808                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1809                 LIST_REMOVE(ni, ni_hash);
 1810                 ni->ni_table = NULL;            /* clear reference */
 1811         } else
 1812                 _ieee80211_free_node(ni);
 1813 }
 1814 
 1815 /*
 1816  * Node table support.
 1817  */
 1818 
 1819 static void
 1820 ieee80211_node_table_init(struct ieee80211com *ic,
 1821         struct ieee80211_node_table *nt,
 1822         const char *name, int inact, int keyixmax)
 1823 {
 1824         struct ifnet *ifp = ic->ic_ifp;
 1825 
 1826         nt->nt_ic = ic;
 1827         IEEE80211_NODE_LOCK_INIT(nt, ifp->if_xname);
 1828         IEEE80211_NODE_ITERATE_LOCK_INIT(nt, ifp->if_xname);
 1829         TAILQ_INIT(&nt->nt_node);
 1830         nt->nt_name = name;
 1831         nt->nt_scangen = 1;
 1832         nt->nt_inact_init = inact;
 1833         nt->nt_keyixmax = keyixmax;
 1834         if (nt->nt_keyixmax > 0) {
 1835                 nt->nt_keyixmap = (struct ieee80211_node **) malloc(
 1836                         keyixmax * sizeof(struct ieee80211_node *),
 1837                         M_80211_NODE, M_NOWAIT | M_ZERO);
 1838                 if (nt->nt_keyixmap == NULL)
 1839                         if_printf(ic->ic_ifp,
 1840                             "Cannot allocate key index map with %u entries\n",
 1841                             keyixmax);
 1842         } else
 1843                 nt->nt_keyixmap = NULL;
 1844 }
 1845 
 1846 static void
 1847 ieee80211_node_table_reset(struct ieee80211_node_table *nt,
 1848         struct ieee80211vap *match)
 1849 {
 1850         struct ieee80211_node *ni, *next;
 1851 
 1852         IEEE80211_NODE_LOCK(nt);
 1853         TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next) {
 1854                 if (match != NULL && ni->ni_vap != match)
 1855                         continue;
 1856                 /* XXX can this happen?  if so need's work */
 1857                 if (ni->ni_associd != 0) {
 1858                         struct ieee80211vap *vap = ni->ni_vap;
 1859 
 1860                         if (vap->iv_auth->ia_node_leave != NULL)
 1861                                 vap->iv_auth->ia_node_leave(ni);
 1862                         if (vap->iv_aid_bitmap != NULL)
 1863                                 IEEE80211_AID_CLR(vap, ni->ni_associd);
 1864                 }
 1865                 ni->ni_wdsvap = NULL;           /* clear reference */
 1866                 node_reclaim(nt, ni);
 1867         }
 1868         if (match != NULL && match->iv_opmode == IEEE80211_M_WDS) {
 1869                 /*
 1870                  * Make a separate pass to clear references to this vap
 1871                  * held by DWDS entries.  They will not be matched above
 1872                  * because ni_vap will point to the ap vap but we still
 1873                  * need to clear ni_wdsvap when the WDS vap is destroyed
 1874                  * and/or reset.
 1875                  */
 1876                 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next)
 1877                         if (ni->ni_wdsvap == match)
 1878                                 ni->ni_wdsvap = NULL;
 1879         }
 1880         IEEE80211_NODE_UNLOCK(nt);
 1881 }
 1882 
 1883 static void
 1884 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
 1885 {
 1886         ieee80211_node_table_reset(nt, NULL);
 1887         if (nt->nt_keyixmap != NULL) {
 1888 #ifdef DIAGNOSTIC
 1889                 /* XXX verify all entries are NULL */
 1890                 int i;
 1891                 for (i = 0; i < nt->nt_keyixmax; i++)
 1892                         if (nt->nt_keyixmap[i] != NULL)
 1893                                 printf("%s: %s[%u] still active\n", __func__,
 1894                                         nt->nt_name, i);
 1895 #endif
 1896                 free(nt->nt_keyixmap, M_80211_NODE);
 1897                 nt->nt_keyixmap = NULL;
 1898         }
 1899         IEEE80211_NODE_ITERATE_LOCK_DESTROY(nt);
 1900         IEEE80211_NODE_LOCK_DESTROY(nt);
 1901 }
 1902 
 1903 /*
 1904  * Timeout inactive stations and do related housekeeping.
 1905  * Note that we cannot hold the node lock while sending a
 1906  * frame as this would lead to a LOR.  Instead we use a
 1907  * generation number to mark nodes that we've scanned and
 1908  * drop the lock and restart a scan if we have to time out
 1909  * a node.  Since we are single-threaded by virtue of
 1910  * controlling the inactivity timer we can be sure this will
 1911  * process each node only once.
 1912  */
 1913 static void
 1914 ieee80211_timeout_stations(struct ieee80211com *ic)
 1915 {
 1916         struct ieee80211_node_table *nt = &ic->ic_sta;
 1917         struct ieee80211vap *vap;
 1918         struct ieee80211_node *ni;
 1919         int gen = 0;
 1920 
 1921         IEEE80211_NODE_ITERATE_LOCK(nt);
 1922         gen = ++nt->nt_scangen;
 1923 restart:
 1924         IEEE80211_NODE_LOCK(nt);
 1925         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 1926                 if (ni->ni_scangen == gen)      /* previously handled */
 1927                         continue;
 1928                 ni->ni_scangen = gen;
 1929                 /*
 1930                  * Ignore entries for which have yet to receive an
 1931                  * authentication frame.  These are transient and
 1932                  * will be reclaimed when the last reference to them
 1933                  * goes away (when frame xmits complete).
 1934                  */
 1935                 vap = ni->ni_vap;
 1936                 /*
 1937                  * Only process stations when in RUN state.  This
 1938                  * insures, for example, that we don't timeout an
 1939                  * inactive station during CAC.  Note that CSA state
 1940                  * is actually handled in ieee80211_node_timeout as
 1941                  * it applies to more than timeout processing.
 1942                  */
 1943                 if (vap->iv_state != IEEE80211_S_RUN)
 1944                         continue;
 1945                 /* XXX can vap be NULL? */
 1946                 if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
 1947                      vap->iv_opmode == IEEE80211_M_STA) &&
 1948                     (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 1949                         continue;
 1950                 /*
 1951                  * Free fragment if not needed anymore
 1952                  * (last fragment older than 1s).
 1953                  * XXX doesn't belong here, move to node_age
 1954                  */
 1955                 if (ni->ni_rxfrag[0] != NULL &&
 1956                     ticks > ni->ni_rxfragstamp + hz) {
 1957                         m_freem(ni->ni_rxfrag[0]);
 1958                         ni->ni_rxfrag[0] = NULL;
 1959                 }
 1960                 if (ni->ni_inact > 0) {
 1961                         ni->ni_inact--;
 1962                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 1963                             "%s: inact %u inact_reload %u nrates %u",
 1964                             __func__, ni->ni_inact, ni->ni_inact_reload,
 1965                             ni->ni_rates.rs_nrates);
 1966                 }
 1967                 /*
 1968                  * Special case ourself; we may be idle for extended periods
 1969                  * of time and regardless reclaiming our state is wrong.
 1970                  * XXX run ic_node_age
 1971                  */
 1972                 if (ni == vap->iv_bss)
 1973                         continue;
 1974                 if (ni->ni_associd != 0 || 
 1975                     (vap->iv_opmode == IEEE80211_M_IBSS ||
 1976                      vap->iv_opmode == IEEE80211_M_AHDEMO)) {
 1977                         /*
 1978                          * Age/drain resources held by the station.
 1979                          */
 1980                         ic->ic_node_age(ni);
 1981                         /*
 1982                          * Probe the station before time it out.  We
 1983                          * send a null data frame which may not be
 1984                          * universally supported by drivers (need it
 1985                          * for ps-poll support so it should be...).
 1986                          *
 1987                          * XXX don't probe the station unless we've
 1988                          *     received a frame from them (and have
 1989                          *     some idea of the rates they are capable
 1990                          *     of); this will get fixed more properly
 1991                          *     soon with better handling of the rate set.
 1992                          */
 1993                         if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
 1994                             (0 < ni->ni_inact &&
 1995                              ni->ni_inact <= vap->iv_inact_probe) &&
 1996                             ni->ni_rates.rs_nrates != 0) {
 1997                                 IEEE80211_NOTE(vap,
 1998                                     IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
 1999                                     ni, "%s",
 2000                                     "probe station due to inactivity");
 2001                                 /*
 2002                                  * Grab a reference before unlocking the table
 2003                                  * so the node cannot be reclaimed before we
 2004                                  * send the frame. ieee80211_send_nulldata
 2005                                  * understands we've done this and reclaims the
 2006                                  * ref for us as needed.
 2007                                  */
 2008                                 ieee80211_ref_node(ni);
 2009                                 IEEE80211_NODE_UNLOCK(nt);
 2010                                 ieee80211_send_nulldata(ni);
 2011                                 /* XXX stat? */
 2012                                 goto restart;
 2013                         }
 2014                 }
 2015                 if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
 2016                     ni->ni_inact <= 0) {
 2017                         IEEE80211_NOTE(vap,
 2018                             IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
 2019                             "station timed out due to inactivity "
 2020                             "(refcnt %u)", ieee80211_node_refcnt(ni));
 2021                         /*
 2022                          * Send a deauthenticate frame and drop the station.
 2023                          * This is somewhat complicated due to reference counts
 2024                          * and locking.  At this point a station will typically
 2025                          * have a reference count of 1.  ieee80211_node_leave
 2026                          * will do a "free" of the node which will drop the
 2027                          * reference count.  But in the meantime a reference
 2028                          * wil be held by the deauth frame.  The actual reclaim
 2029                          * of the node will happen either after the tx is
 2030                          * completed or by ieee80211_node_leave.
 2031                          *
 2032                          * Separately we must drop the node lock before sending
 2033                          * in case the driver takes a lock, as this can result
 2034                          * in a LOR between the node lock and the driver lock.
 2035                          */
 2036                         ieee80211_ref_node(ni);
 2037                         IEEE80211_NODE_UNLOCK(nt);
 2038                         if (ni->ni_associd != 0) {
 2039                                 IEEE80211_SEND_MGMT(ni,
 2040                                     IEEE80211_FC0_SUBTYPE_DEAUTH,
 2041                                     IEEE80211_REASON_AUTH_EXPIRE);
 2042                         }
 2043                         ieee80211_node_leave(ni);
 2044                         ieee80211_free_node(ni);
 2045                         vap->iv_stats.is_node_timeout++;
 2046                         goto restart;
 2047                 }
 2048         }
 2049         IEEE80211_NODE_UNLOCK(nt);
 2050 
 2051         IEEE80211_NODE_ITERATE_UNLOCK(nt);
 2052 }
 2053 
 2054 /*
 2055  * Aggressively reclaim resources.  This should be used
 2056  * only in a critical situation to reclaim mbuf resources.
 2057  */
 2058 void
 2059 ieee80211_drain(struct ieee80211com *ic)
 2060 {
 2061         struct ieee80211_node_table *nt = &ic->ic_sta;
 2062         struct ieee80211vap *vap;
 2063         struct ieee80211_node *ni;
 2064 
 2065         IEEE80211_NODE_LOCK(nt);
 2066         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 2067                 /*
 2068                  * Ignore entries for which have yet to receive an
 2069                  * authentication frame.  These are transient and
 2070                  * will be reclaimed when the last reference to them
 2071                  * goes away (when frame xmits complete).
 2072                  */
 2073                 vap = ni->ni_vap;
 2074                 /*
 2075                  * Only process stations when in RUN state.  This
 2076                  * insures, for example, that we don't timeout an
 2077                  * inactive station during CAC.  Note that CSA state
 2078                  * is actually handled in ieee80211_node_timeout as
 2079                  * it applies to more than timeout processing.
 2080                  */
 2081                 if (vap->iv_state != IEEE80211_S_RUN)
 2082                         continue;
 2083                 /* XXX can vap be NULL? */
 2084                 if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
 2085                      vap->iv_opmode == IEEE80211_M_STA) &&
 2086                     (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 2087                         continue;
 2088                 /*
 2089                  * Free fragments.
 2090                  * XXX doesn't belong here, move to node_drain
 2091                  */
 2092                 if (ni->ni_rxfrag[0] != NULL) {
 2093                         m_freem(ni->ni_rxfrag[0]);
 2094                         ni->ni_rxfrag[0] = NULL;
 2095                 }
 2096                 /*
 2097                  * Drain resources held by the station.
 2098                  */
 2099                 ic->ic_node_drain(ni);
 2100         }
 2101         IEEE80211_NODE_UNLOCK(nt);
 2102 }
 2103 
 2104 /*
 2105  * Per-ieee80211com inactivity timer callback.
 2106  */
 2107 void
 2108 ieee80211_node_timeout(void *arg)
 2109 {
 2110         struct ieee80211com *ic = arg;
 2111 
 2112         /*
 2113          * Defer timeout processing if a channel switch is pending.
 2114          * We typically need to be mute so not doing things that
 2115          * might generate frames is good to handle in one place.
 2116          * Supressing the station timeout processing may extend the
 2117          * lifetime of inactive stations (by not decrementing their
 2118          * idle counters) but this should be ok unless the CSA is
 2119          * active for an unusually long time.
 2120          */
 2121         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
 2122                 ieee80211_scan_timeout(ic);
 2123                 ieee80211_timeout_stations(ic);
 2124                 ieee80211_ageq_age(&ic->ic_stageq, IEEE80211_INACT_WAIT);
 2125 
 2126                 IEEE80211_LOCK(ic);
 2127                 ieee80211_erp_timeout(ic);
 2128                 ieee80211_ht_timeout(ic);
 2129                 IEEE80211_UNLOCK(ic);
 2130         }
 2131         callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
 2132                 ieee80211_node_timeout, ic);
 2133 }
 2134 
 2135 void
 2136 ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
 2137         ieee80211_iter_func *f, void *arg)
 2138 {
 2139         struct ieee80211_node *ni;
 2140         u_int gen;
 2141 
 2142         IEEE80211_NODE_ITERATE_LOCK(nt);
 2143         gen = ++nt->nt_scangen;
 2144 restart:
 2145         IEEE80211_NODE_LOCK(nt);
 2146         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 2147                 if (ni->ni_scangen != gen) {
 2148                         ni->ni_scangen = gen;
 2149                         (void) ieee80211_ref_node(ni);
 2150                         IEEE80211_NODE_UNLOCK(nt);
 2151                         (*f)(arg, ni);
 2152                         ieee80211_free_node(ni);
 2153                         goto restart;
 2154                 }
 2155         }
 2156         IEEE80211_NODE_UNLOCK(nt);
 2157 
 2158         IEEE80211_NODE_ITERATE_UNLOCK(nt);
 2159 }
 2160 
 2161 void
 2162 ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 2163 {
 2164         printf("0x%p: mac %s refcnt %d\n", ni,
 2165                 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
 2166         printf("\tscangen %u authmode %u flags 0x%x\n",
 2167                 ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
 2168         printf("\tassocid 0x%x txpower %u vlan %u\n",
 2169                 ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
 2170         printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
 2171                 ni->ni_txseqs[IEEE80211_NONQOS_TID],
 2172                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT,
 2173                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK,
 2174                 ni->ni_rxfragstamp);
 2175         printf("\trssi %d noise %d intval %u capinfo 0x%x\n",
 2176                 node_getrssi(ni), ni->ni_noise,
 2177                 ni->ni_intval, ni->ni_capinfo);
 2178         printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
 2179                 ether_sprintf(ni->ni_bssid),
 2180                 ni->ni_esslen, ni->ni_essid,
 2181                 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
 2182         printf("\tinact %u inact_reload %u txrate %u\n",
 2183                 ni->ni_inact, ni->ni_inact_reload, ni->ni_txrate);
 2184         printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n",
 2185                 ni->ni_htcap, ni->ni_htparam,
 2186                 ni->ni_htctlchan, ni->ni_ht2ndchan);
 2187         printf("\thtopmode %x htstbc %x chw %u\n",
 2188                 ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw);
 2189 }
 2190 
 2191 void
 2192 ieee80211_dump_nodes(struct ieee80211_node_table *nt)
 2193 {
 2194         ieee80211_iterate_nodes(nt,
 2195                 (ieee80211_iter_func *) ieee80211_dump_node, nt);
 2196 }
 2197 
 2198 static void
 2199 ieee80211_notify_erp_locked(struct ieee80211com *ic)
 2200 {
 2201         struct ieee80211vap *vap;
 2202 
 2203         IEEE80211_LOCK_ASSERT(ic);
 2204 
 2205         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 2206                 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
 2207                         ieee80211_beacon_notify(vap, IEEE80211_BEACON_ERP);
 2208 }
 2209 
 2210 void
 2211 ieee80211_notify_erp(struct ieee80211com *ic)
 2212 {
 2213         IEEE80211_LOCK(ic);
 2214         ieee80211_notify_erp_locked(ic);
 2215         IEEE80211_UNLOCK(ic);
 2216 }
 2217 
 2218 /*
 2219  * Handle a station joining an 11g network.
 2220  */
 2221 static void
 2222 ieee80211_node_join_11g(struct ieee80211_node *ni)
 2223 {
 2224         struct ieee80211com *ic = ni->ni_ic;
 2225 
 2226         IEEE80211_LOCK_ASSERT(ic);
 2227 
 2228         /*
 2229          * Station isn't capable of short slot time.  Bump
 2230          * the count of long slot time stations and disable
 2231          * use of short slot time.  Note that the actual switch
 2232          * over to long slot time use may not occur until the
 2233          * next beacon transmission (per sec. 7.3.1.4 of 11g).
 2234          */
 2235         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 2236                 ic->ic_longslotsta++;
 2237                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2238                     "station needs long slot time, count %d",
 2239                     ic->ic_longslotsta);
 2240                 /* XXX vap's w/ conflicting needs won't work */
 2241                 if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
 2242                         /*
 2243                          * Don't force slot time when switched to turbo
 2244                          * mode as non-ERP stations won't be present; this
 2245                          * need only be done when on the normal G channel.
 2246                          */
 2247                         ieee80211_set_shortslottime(ic, 0);
 2248                 }
 2249         }
 2250         /*
 2251          * If the new station is not an ERP station
 2252          * then bump the counter and enable protection
 2253          * if configured.
 2254          */
 2255         if (!ieee80211_iserp_rateset(&ni->ni_rates)) {
 2256                 ic->ic_nonerpsta++;
 2257                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2258                     "station is !ERP, %d non-ERP stations associated",
 2259                     ic->ic_nonerpsta);
 2260                 /*
 2261                  * If station does not support short preamble
 2262                  * then we must enable use of Barker preamble.
 2263                  */
 2264                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
 2265                         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2266                             "%s", "station needs long preamble");
 2267                         ic->ic_flags |= IEEE80211_F_USEBARKER;
 2268                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
 2269                 }
 2270                 /*
 2271                  * If protection is configured and this is the first
 2272                  * indication we should use protection, enable it.
 2273                  */
 2274                 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
 2275                     ic->ic_nonerpsta == 1 &&
 2276                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 2277                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
 2278                             "%s: enable use of protection\n", __func__);
 2279                         ic->ic_flags |= IEEE80211_F_USEPROT;
 2280                         ieee80211_notify_erp_locked(ic);
 2281                 }
 2282         } else
 2283                 ni->ni_flags |= IEEE80211_NODE_ERP;
 2284 }
 2285 
 2286 void
 2287 ieee80211_node_join(struct ieee80211_node *ni, int resp)
 2288 {
 2289         struct ieee80211com *ic = ni->ni_ic;
 2290         struct ieee80211vap *vap = ni->ni_vap;
 2291         int newassoc;
 2292 
 2293         if (ni->ni_associd == 0) {
 2294                 uint16_t aid;
 2295 
 2296                 KASSERT(vap->iv_aid_bitmap != NULL, ("no aid bitmap"));
 2297                 /*
 2298                  * It would be good to search the bitmap
 2299                  * more efficiently, but this will do for now.
 2300                  */
 2301                 for (aid = 1; aid < vap->iv_max_aid; aid++) {
 2302                         if (!IEEE80211_AID_ISSET(vap, aid))
 2303                                 break;
 2304                 }
 2305                 if (aid >= vap->iv_max_aid) {
 2306                         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_TOOMANY);
 2307                         ieee80211_node_leave(ni);
 2308                         return;
 2309                 }
 2310                 ni->ni_associd = aid | 0xc000;
 2311                 ni->ni_jointime = time_uptime;
 2312                 IEEE80211_LOCK(ic);
 2313                 IEEE80211_AID_SET(vap, ni->ni_associd);
 2314                 vap->iv_sta_assoc++;
 2315                 ic->ic_sta_assoc++;
 2316 
 2317                 if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 2318                         ieee80211_ht_node_join(ni);
 2319                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2320                     IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 2321                         ieee80211_node_join_11g(ni);
 2322                 IEEE80211_UNLOCK(ic);
 2323 
 2324                 newassoc = 1;
 2325         } else
 2326                 newassoc = 0;
 2327 
 2328         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 2329             "station associated at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
 2330             IEEE80211_NODE_AID(ni),
 2331             ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
 2332             ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
 2333             ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
 2334             ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
 2335             ni->ni_flags & IEEE80211_NODE_HT ?
 2336                 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
 2337             ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
 2338             ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
 2339                 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
 2340             ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
 2341             IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
 2342                 ", fast-frames" : "",
 2343             IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
 2344                 ", turbo" : ""
 2345         );
 2346 
 2347         ieee80211_node_setuptxparms(ni);
 2348         ieee80211_ratectl_node_init(ni);
 2349         /* give driver a chance to setup state like ni_txrate */
 2350         if (ic->ic_newassoc != NULL)
 2351                 ic->ic_newassoc(ni, newassoc);
 2352         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_SUCCESS);
 2353         /* tell the authenticator about new station */
 2354         if (vap->iv_auth->ia_node_join != NULL)
 2355                 vap->iv_auth->ia_node_join(ni);
 2356         ieee80211_notify_node_join(ni,
 2357             resp == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 2358 }
 2359 
 2360 static void
 2361 disable_protection(struct ieee80211com *ic)
 2362 {
 2363         KASSERT(ic->ic_nonerpsta == 0 &&
 2364             (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0,
 2365            ("%d non ERP stations, flags 0x%x", ic->ic_nonerpsta,
 2366            ic->ic_flags_ext));
 2367 
 2368         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 2369         /* XXX verify mode? */
 2370         if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
 2371                 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
 2372                 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
 2373         }
 2374         ieee80211_notify_erp_locked(ic);
 2375 }
 2376 
 2377 /*
 2378  * Handle a station leaving an 11g network.
 2379  */
 2380 static void
 2381 ieee80211_node_leave_11g(struct ieee80211_node *ni)
 2382 {
 2383         struct ieee80211com *ic = ni->ni_ic;
 2384 
 2385         IEEE80211_LOCK_ASSERT(ic);
 2386 
 2387         KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
 2388              ("not in 11g, bss %u:0x%x", ic->ic_bsschan->ic_freq,
 2389               ic->ic_bsschan->ic_flags));
 2390 
 2391         /*
 2392          * If a long slot station do the slot time bookkeeping.
 2393          */
 2394         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 2395                 KASSERT(ic->ic_longslotsta > 0,
 2396                     ("bogus long slot station count %d", ic->ic_longslotsta));
 2397                 ic->ic_longslotsta--;
 2398                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2399                     "long slot time station leaves, count now %d",
 2400                     ic->ic_longslotsta);
 2401                 if (ic->ic_longslotsta == 0) {
 2402                         /*
 2403                          * Re-enable use of short slot time if supported
 2404                          * and not operating in IBSS mode (per spec).
 2405                          */
 2406                         if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
 2407                             ic->ic_opmode != IEEE80211_M_IBSS) {
 2408                                 IEEE80211_DPRINTF(ni->ni_vap,
 2409                                     IEEE80211_MSG_ASSOC,
 2410                                     "%s: re-enable use of short slot time\n",
 2411                                     __func__);
 2412                                 ieee80211_set_shortslottime(ic, 1);
 2413                         }
 2414                 }
 2415         }
 2416         /*
 2417          * If a non-ERP station do the protection-related bookkeeping.
 2418          */
 2419         if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
 2420                 KASSERT(ic->ic_nonerpsta > 0,
 2421                     ("bogus non-ERP station count %d", ic->ic_nonerpsta));
 2422                 ic->ic_nonerpsta--;
 2423                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2424                     "non-ERP station leaves, count now %d%s", ic->ic_nonerpsta,
 2425                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) ?
 2426                         " (non-ERP sta present)" : "");
 2427                 if (ic->ic_nonerpsta == 0 &&
 2428                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 2429                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
 2430                                 "%s: disable use of protection\n", __func__);
 2431                         disable_protection(ic);
 2432                 }
 2433         }
 2434 }
 2435 
 2436 /*
 2437  * Time out presence of an overlapping bss with non-ERP
 2438  * stations.  When operating in hostap mode we listen for
 2439  * beacons from other stations and if we identify a non-ERP
 2440  * station is present we enable protection.  To identify
 2441  * when all non-ERP stations are gone we time out this
 2442  * condition.
 2443  */
 2444 static void
 2445 ieee80211_erp_timeout(struct ieee80211com *ic)
 2446 {
 2447 
 2448         IEEE80211_LOCK_ASSERT(ic);
 2449 
 2450         if ((ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) &&
 2451             time_after(ticks, ic->ic_lastnonerp + IEEE80211_NONERP_PRESENT_AGE)) {
 2452 #if 0
 2453                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 2454                     "%s", "age out non-ERP sta present on channel");
 2455 #endif
 2456                 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 2457                 if (ic->ic_nonerpsta == 0)
 2458                         disable_protection(ic);
 2459         }
 2460 }
 2461 
 2462 /*
 2463  * Handle bookkeeping for station deauthentication/disassociation
 2464  * when operating as an ap.
 2465  */
 2466 void
 2467 ieee80211_node_leave(struct ieee80211_node *ni)
 2468 {
 2469         struct ieee80211com *ic = ni->ni_ic;
 2470         struct ieee80211vap *vap = ni->ni_vap;
 2471         struct ieee80211_node_table *nt = ni->ni_table;
 2472 
 2473         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 2474             "station with aid %d leaves", IEEE80211_NODE_AID(ni));
 2475 
 2476         KASSERT(vap->iv_opmode != IEEE80211_M_STA,
 2477                 ("unexpected operating mode %u", vap->iv_opmode));
 2478         /*
 2479          * If node wasn't previously associated all
 2480          * we need to do is reclaim the reference.
 2481          */
 2482         /* XXX ibss mode bypasses 11g and notification */
 2483         if (ni->ni_associd == 0)
 2484                 goto done;
 2485         /*
 2486          * Tell the authenticator the station is leaving.
 2487          * Note that we must do this before yanking the
 2488          * association id as the authenticator uses the
 2489          * associd to locate it's state block.
 2490          */
 2491         if (vap->iv_auth->ia_node_leave != NULL)
 2492                 vap->iv_auth->ia_node_leave(ni);
 2493 
 2494         IEEE80211_LOCK(ic);
 2495         IEEE80211_AID_CLR(vap, ni->ni_associd);
 2496         ni->ni_associd = 0;
 2497         vap->iv_sta_assoc--;
 2498         ic->ic_sta_assoc--;
 2499 
 2500         if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 2501                 ieee80211_ht_node_leave(ni);
 2502         if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2503             IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 2504                 ieee80211_node_leave_11g(ni);
 2505         IEEE80211_UNLOCK(ic);
 2506         /*
 2507          * Cleanup station state.  In particular clear various
 2508          * state that might otherwise be reused if the node
 2509          * is reused before the reference count goes to zero
 2510          * (and memory is reclaimed).
 2511          */
 2512         ieee80211_sta_leave(ni);
 2513 done:
 2514         /*
 2515          * Remove the node from any table it's recorded in and
 2516          * drop the caller's reference.  Removal from the table
 2517          * is important to insure the node is not reprocessed
 2518          * for inactivity.
 2519          */
 2520         if (nt != NULL) {
 2521                 IEEE80211_NODE_LOCK(nt);
 2522                 node_reclaim(nt, ni);
 2523                 IEEE80211_NODE_UNLOCK(nt);
 2524         } else
 2525                 ieee80211_free_node(ni);
 2526 }
 2527 
 2528 struct rssiinfo {
 2529         struct ieee80211vap *vap;
 2530         int     rssi_samples;
 2531         uint32_t rssi_total;
 2532 };
 2533 
 2534 static void
 2535 get_hostap_rssi(void *arg, struct ieee80211_node *ni)
 2536 {
 2537         struct rssiinfo *info = arg;
 2538         struct ieee80211vap *vap = ni->ni_vap;
 2539         int8_t rssi;
 2540 
 2541         if (info->vap != vap)
 2542                 return;
 2543         /* only associated stations */
 2544         if (ni->ni_associd == 0)
 2545                 return;
 2546         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2547         if (rssi != 0) {
 2548                 info->rssi_samples++;
 2549                 info->rssi_total += rssi;
 2550         }
 2551 }
 2552 
 2553 static void
 2554 get_adhoc_rssi(void *arg, struct ieee80211_node *ni)
 2555 {
 2556         struct rssiinfo *info = arg;
 2557         struct ieee80211vap *vap = ni->ni_vap;
 2558         int8_t rssi;
 2559 
 2560         if (info->vap != vap)
 2561                 return;
 2562         /* only neighbors */
 2563         /* XXX check bssid */
 2564         if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
 2565                 return;
 2566         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2567         if (rssi != 0) {
 2568                 info->rssi_samples++;
 2569                 info->rssi_total += rssi;
 2570         }
 2571 }
 2572 
 2573 #ifdef IEEE80211_SUPPORT_MESH
 2574 static void
 2575 get_mesh_rssi(void *arg, struct ieee80211_node *ni)
 2576 {
 2577         struct rssiinfo *info = arg;
 2578         struct ieee80211vap *vap = ni->ni_vap;
 2579         int8_t rssi;
 2580 
 2581         if (info->vap != vap)
 2582                 return;
 2583         /* only neighbors that peered successfully */
 2584         if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
 2585                 return;
 2586         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2587         if (rssi != 0) {
 2588                 info->rssi_samples++;
 2589                 info->rssi_total += rssi;
 2590         }
 2591 }
 2592 #endif /* IEEE80211_SUPPORT_MESH */
 2593 
 2594 int8_t
 2595 ieee80211_getrssi(struct ieee80211vap *vap)
 2596 {
 2597 #define NZ(x)   ((x) == 0 ? 1 : (x))
 2598         struct ieee80211com *ic = vap->iv_ic;
 2599         struct rssiinfo info;
 2600 
 2601         info.rssi_total = 0;
 2602         info.rssi_samples = 0;
 2603         info.vap = vap;
 2604         switch (vap->iv_opmode) {
 2605         case IEEE80211_M_IBSS:          /* average of all ibss neighbors */
 2606         case IEEE80211_M_AHDEMO:        /* average of all neighbors */
 2607                 ieee80211_iterate_nodes(&ic->ic_sta, get_adhoc_rssi, &info);
 2608                 break;
 2609         case IEEE80211_M_HOSTAP:        /* average of all associated stations */
 2610                 ieee80211_iterate_nodes(&ic->ic_sta, get_hostap_rssi, &info);
 2611                 break;
 2612 #ifdef IEEE80211_SUPPORT_MESH
 2613         case IEEE80211_M_MBSS:          /* average of all mesh neighbors */
 2614                 ieee80211_iterate_nodes(&ic->ic_sta, get_mesh_rssi, &info);
 2615                 break;
 2616 #endif
 2617         case IEEE80211_M_MONITOR:       /* XXX */
 2618         case IEEE80211_M_STA:           /* use stats from associated ap */
 2619         default:
 2620                 if (vap->iv_bss != NULL)
 2621                         info.rssi_total = ic->ic_node_getrssi(vap->iv_bss);
 2622                 info.rssi_samples = 1;
 2623                 break;
 2624         }
 2625         return info.rssi_total / NZ(info.rssi_samples);
 2626 #undef NZ
 2627 }
 2628 
 2629 void
 2630 ieee80211_getsignal(struct ieee80211vap *vap, int8_t *rssi, int8_t *noise)
 2631 {
 2632 
 2633         if (vap->iv_bss == NULL)                /* NB: shouldn't happen */
 2634                 return;
 2635         vap->iv_ic->ic_node_getsignal(vap->iv_bss, rssi, noise);
 2636         /* for non-station mode return avg'd rssi accounting */
 2637         if (vap->iv_opmode != IEEE80211_M_STA)
 2638                 *rssi = ieee80211_getrssi(vap);
 2639 }

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