The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
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/9/sys/net80211/ieee80211_node.c 220935 2011-04-22 00:44:27Z adrian $");
   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                  * We must install the legacy rate est in ni_rates and the
  289                  * HT rate set in ni_htrates.
  290                  */
  291                 ni->ni_htrates = *ieee80211_get_suphtrates(ic, chan);
  292                 /*
  293                  * Setup bss tx parameters based on operating mode.  We
  294                  * use legacy rates when operating in a mixed HT+non-HT bss
  295                  * and non-ERP rates in 11g for mixed ERP+non-ERP bss.
  296                  */
  297                 if (mode == IEEE80211_MODE_11NA &&
  298                     (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
  299                         mode = IEEE80211_MODE_11A;
  300                 else if (mode == IEEE80211_MODE_11NG &&
  301                     (vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
  302                         mode = IEEE80211_MODE_11G;
  303                 if (mode == IEEE80211_MODE_11G &&
  304                     (vap->iv_flags & IEEE80211_F_PUREG) == 0)
  305                         mode = IEEE80211_MODE_11B;
  306         }
  307         ni->ni_txparms = &vap->iv_txparms[mode];
  308         ni->ni_rates = *ieee80211_get_suprates(ic, chan);
  309 }
  310 
  311 static __inline void
  312 copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
  313 {
  314         /* propagate useful state */
  315         nbss->ni_authmode = obss->ni_authmode;
  316         nbss->ni_txpower = obss->ni_txpower;
  317         nbss->ni_vlan = obss->ni_vlan;
  318         /* XXX statistics? */
  319         /* XXX legacy WDS bssid? */
  320 }
  321 
  322 void
  323 ieee80211_create_ibss(struct ieee80211vap* vap, struct ieee80211_channel *chan)
  324 {
  325         struct ieee80211com *ic = vap->iv_ic;
  326         struct ieee80211_node *ni;
  327 
  328         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  329                 "%s: creating %s on channel %u\n", __func__,
  330                 ieee80211_opmode_name[vap->iv_opmode],
  331                 ieee80211_chan2ieee(ic, chan));
  332 
  333         ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
  334         if (ni == NULL) {
  335                 /* XXX recovery? */
  336                 return;
  337         }
  338         IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
  339         ni->ni_esslen = vap->iv_des_ssid[0].len;
  340         memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
  341         if (vap->iv_bss != NULL)
  342                 copy_bss(ni, vap->iv_bss);
  343         ni->ni_intval = ic->ic_bintval;
  344         if (vap->iv_flags & IEEE80211_F_PRIVACY)
  345                 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
  346         if (ic->ic_phytype == IEEE80211_T_FH) {
  347                 ni->ni_fhdwell = 200;   /* XXX */
  348                 ni->ni_fhindex = 1;
  349         }
  350         if (vap->iv_opmode == IEEE80211_M_IBSS) {
  351                 vap->iv_flags |= IEEE80211_F_SIBSS;
  352                 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS;       /* XXX */
  353                 if (vap->iv_flags & IEEE80211_F_DESBSSID)
  354                         IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
  355                 else {
  356                         get_random_bytes(ni->ni_bssid, IEEE80211_ADDR_LEN);
  357                         /* clear group bit, add local bit */
  358                         ni->ni_bssid[0] = (ni->ni_bssid[0] &~ 0x01) | 0x02;
  359                 }
  360         } else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
  361                 if (vap->iv_flags & IEEE80211_F_DESBSSID)
  362                         IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
  363                 else
  364 #ifdef IEEE80211_SUPPORT_TDMA
  365                 if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
  366 #endif
  367                         memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN);
  368 #ifdef IEEE80211_SUPPORT_MESH
  369         } else if (vap->iv_opmode == IEEE80211_M_MBSS) {
  370                 ni->ni_meshidlen = vap->iv_mesh->ms_idlen;
  371                 memcpy(ni->ni_meshid, vap->iv_mesh->ms_id, ni->ni_meshidlen);
  372 #endif
  373         }
  374         /* 
  375          * Fix the channel and related attributes.
  376          */
  377         /* clear DFS CAC state on previous channel */
  378         if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
  379             ic->ic_bsschan->ic_freq != chan->ic_freq &&
  380             IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan))
  381                 ieee80211_dfs_cac_clear(ic, ic->ic_bsschan);
  382         ic->ic_bsschan = chan;
  383         ieee80211_node_set_chan(ni, chan);
  384         ic->ic_curmode = ieee80211_chan2mode(chan);
  385         /*
  386          * Do mode-specific setup.
  387          */
  388         if (IEEE80211_IS_CHAN_FULL(chan)) {
  389                 if (IEEE80211_IS_CHAN_ANYG(chan)) {
  390                         /*
  391                          * Use a mixed 11b/11g basic rate set.
  392                          */
  393                         ieee80211_setbasicrates(&ni->ni_rates,
  394                             IEEE80211_MODE_11G);
  395                         if (vap->iv_flags & IEEE80211_F_PUREG) {
  396                                 /*
  397                                  * Also mark OFDM rates basic so 11b
  398                                  * stations do not join (WiFi compliance).
  399                                  */
  400                                 ieee80211_addbasicrates(&ni->ni_rates,
  401                                     IEEE80211_MODE_11A);
  402                         }
  403                 } else if (IEEE80211_IS_CHAN_B(chan)) {
  404                         /*
  405                          * Force pure 11b rate set.
  406                          */
  407                         ieee80211_setbasicrates(&ni->ni_rates,
  408                                 IEEE80211_MODE_11B);
  409                 }
  410         }
  411 
  412         (void) ieee80211_sta_join1(ieee80211_ref_node(ni));
  413 }
  414 
  415 /*
  416  * Reset bss state on transition to the INIT state.
  417  * Clear any stations from the table (they have been
  418  * deauth'd) and reset the bss node (clears key, rate
  419  * etc. state).
  420  */
  421 void
  422 ieee80211_reset_bss(struct ieee80211vap *vap)
  423 {
  424         struct ieee80211com *ic = vap->iv_ic;
  425         struct ieee80211_node *ni, *obss;
  426 
  427         ieee80211_node_table_reset(&ic->ic_sta, vap);
  428         /* XXX multi-bss: wrong */
  429         ieee80211_reset_erp(ic);
  430 
  431         ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
  432         KASSERT(ni != NULL, ("unable to setup initial BSS node"));
  433         obss = vap->iv_bss;
  434         vap->iv_bss = ieee80211_ref_node(ni);
  435         if (obss != NULL) {
  436                 copy_bss(ni, obss);
  437                 ni->ni_intval = ic->ic_bintval;
  438                 ieee80211_free_node(obss);
  439         } else
  440                 IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
  441 }
  442 
  443 static int
  444 match_ssid(const struct ieee80211_node *ni,
  445         int nssid, const struct ieee80211_scan_ssid ssids[])
  446 {
  447         int i;
  448 
  449         for (i = 0; i < nssid; i++) {
  450                 if (ni->ni_esslen == ssids[i].len &&
  451                      memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0)
  452                         return 1;
  453         }
  454         return 0;
  455 }
  456 
  457 /*
  458  * Test a node for suitability/compatibility.
  459  */
  460 static int
  461 check_bss(struct ieee80211vap *vap, struct ieee80211_node *ni)
  462 {
  463         struct ieee80211com *ic = ni->ni_ic;
  464         uint8_t rate;
  465 
  466         if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
  467                 return 0;
  468         if (vap->iv_opmode == IEEE80211_M_IBSS) {
  469                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
  470                         return 0;
  471         } else {
  472                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
  473                         return 0;
  474         }
  475         if (vap->iv_flags & IEEE80211_F_PRIVACY) {
  476                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
  477                         return 0;
  478         } else {
  479                 /* XXX does this mean privacy is supported or required? */
  480                 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
  481                         return 0;
  482         }
  483         rate = ieee80211_fix_rate(ni, &ni->ni_rates,
  484             IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
  485         if (rate & IEEE80211_RATE_BASIC)
  486                 return 0;
  487         if (vap->iv_des_nssid != 0 &&
  488             !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
  489                 return 0;
  490         if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
  491             !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
  492                 return 0;
  493         return 1;
  494 }
  495 
  496 #ifdef IEEE80211_DEBUG
  497 /*
  498  * Display node suitability/compatibility.
  499  */
  500 static void
  501 check_bss_debug(struct ieee80211vap *vap, struct ieee80211_node *ni)
  502 {
  503         struct ieee80211com *ic = ni->ni_ic;
  504         uint8_t rate;
  505         int fail;
  506 
  507         fail = 0;
  508         if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
  509                 fail |= 0x01;
  510         if (vap->iv_opmode == IEEE80211_M_IBSS) {
  511                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
  512                         fail |= 0x02;
  513         } else {
  514                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
  515                         fail |= 0x02;
  516         }
  517         if (vap->iv_flags & IEEE80211_F_PRIVACY) {
  518                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
  519                         fail |= 0x04;
  520         } else {
  521                 /* XXX does this mean privacy is supported or required? */
  522                 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
  523                         fail |= 0x04;
  524         }
  525         rate = ieee80211_fix_rate(ni, &ni->ni_rates,
  526              IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
  527         if (rate & IEEE80211_RATE_BASIC)
  528                 fail |= 0x08;
  529         if (vap->iv_des_nssid != 0 &&
  530             !match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
  531                 fail |= 0x10;
  532         if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
  533             !IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
  534                 fail |= 0x20;
  535 
  536         printf(" %c %s", fail ? '-' : '+', ether_sprintf(ni->ni_macaddr));
  537         printf(" %s%c", ether_sprintf(ni->ni_bssid), fail & 0x20 ? '!' : ' ');
  538         printf(" %3d%c",
  539             ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' ');
  540         printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
  541             fail & 0x08 ? '!' : ' ');
  542         printf(" %4s%c",
  543             (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
  544             (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
  545             "????",
  546             fail & 0x02 ? '!' : ' ');
  547         printf(" %3s%c ",
  548             (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?  "wep" : "no",
  549             fail & 0x04 ? '!' : ' ');
  550         ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
  551         printf("%s\n", fail & 0x10 ? "!" : "");
  552 }
  553 #endif /* IEEE80211_DEBUG */
  554  
  555 /*
  556  * Handle 802.11 ad hoc network merge.  The
  557  * convention, set by the Wireless Ethernet Compatibility Alliance
  558  * (WECA), is that an 802.11 station will change its BSSID to match
  559  * the "oldest" 802.11 ad hoc network, on the same channel, that
  560  * has the station's desired SSID.  The "oldest" 802.11 network
  561  * sends beacons with the greatest TSF timestamp.
  562  *
  563  * The caller is assumed to validate TSF's before attempting a merge.
  564  *
  565  * Return !0 if the BSSID changed, 0 otherwise.
  566  */
  567 int
  568 ieee80211_ibss_merge(struct ieee80211_node *ni)
  569 {
  570         struct ieee80211vap *vap = ni->ni_vap;
  571 #ifdef IEEE80211_DEBUG
  572         struct ieee80211com *ic = ni->ni_ic;
  573 #endif
  574 
  575         if (ni == vap->iv_bss ||
  576             IEEE80211_ADDR_EQ(ni->ni_bssid, vap->iv_bss->ni_bssid)) {
  577                 /* unchanged, nothing to do */
  578                 return 0;
  579         }
  580         if (!check_bss(vap, ni)) {
  581                 /* capabilities mismatch */
  582                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
  583                     "%s: merge failed, capabilities mismatch\n", __func__);
  584 #ifdef IEEE80211_DEBUG
  585                 if (ieee80211_msg_assoc(vap))
  586                         check_bss_debug(vap, ni);
  587 #endif
  588                 vap->iv_stats.is_ibss_capmismatch++;
  589                 return 0;
  590         }
  591         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
  592                 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__,
  593                 ether_sprintf(ni->ni_bssid),
  594                 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
  595                 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
  596                 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : ""
  597         );
  598         return ieee80211_sta_join1(ieee80211_ref_node(ni));
  599 }
  600 
  601 /*
  602  * Calculate HT channel promotion flags for all vaps.
  603  * This assumes ni_chan have been setup for each vap.
  604  */
  605 static int
  606 gethtadjustflags(struct ieee80211com *ic)
  607 {
  608         struct ieee80211vap *vap;
  609         int flags;
  610 
  611         flags = 0;
  612         /* XXX locking */
  613         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  614                 if (vap->iv_state < IEEE80211_S_RUN)
  615                         continue;
  616                 switch (vap->iv_opmode) {
  617                 case IEEE80211_M_WDS:
  618                 case IEEE80211_M_STA:
  619                 case IEEE80211_M_AHDEMO:
  620                 case IEEE80211_M_HOSTAP:
  621                 case IEEE80211_M_IBSS:
  622                 case IEEE80211_M_MBSS:
  623                         flags |= ieee80211_htchanflags(vap->iv_bss->ni_chan);
  624                         break;
  625                 default:
  626                         break;
  627                 }
  628         }
  629         return flags;
  630 }
  631 
  632 /*
  633  * Check if the current channel needs to change based on whether
  634  * any vap's are using HT20/HT40.  This is used to sync the state
  635  * of ic_curchan after a channel width change on a running vap.
  636  */
  637 void
  638 ieee80211_sync_curchan(struct ieee80211com *ic)
  639 {
  640         struct ieee80211_channel *c;
  641 
  642         c = ieee80211_ht_adjust_channel(ic, ic->ic_curchan, gethtadjustflags(ic));
  643         if (c != ic->ic_curchan) {
  644                 ic->ic_curchan = c;
  645                 ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
  646                 ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  647                 IEEE80211_UNLOCK(ic);
  648                 ic->ic_set_channel(ic);
  649                 ieee80211_radiotap_chan_change(ic);
  650                 IEEE80211_LOCK(ic);
  651         }
  652 }
  653 
  654 /*
  655  * Setup the current channel.  The request channel may be
  656  * promoted if other vap's are operating with HT20/HT40.
  657  */
  658 void
  659 ieee80211_setupcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
  660 {
  661         if (ic->ic_htcaps & IEEE80211_HTC_HT) {
  662                 int flags = gethtadjustflags(ic);
  663                 /*
  664                  * Check for channel promotion required to support the
  665                  * set of running vap's.  This assumes we are called
  666                  * after ni_chan is setup for each vap.
  667                  */
  668                 /* NB: this assumes IEEE80211_FHT_USEHT40 > IEEE80211_FHT_HT */
  669                 if (flags > ieee80211_htchanflags(c))
  670                         c = ieee80211_ht_adjust_channel(ic, c, flags);
  671         }
  672         ic->ic_bsschan = ic->ic_curchan = c;
  673         ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
  674         ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  675 }
  676 
  677 /*
  678  * Change the current channel.  The channel change is guaranteed to have
  679  * happened before the next state change.
  680  */
  681 void
  682 ieee80211_setcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
  683 {
  684         ieee80211_setupcurchan(ic, c);
  685         ieee80211_runtask(ic, &ic->ic_chan_task);
  686 }
  687 
  688 /*
  689  * Join the specified IBSS/BSS network.  The node is assumed to
  690  * be passed in with a held reference.
  691  */
  692 static int
  693 ieee80211_sta_join1(struct ieee80211_node *selbs)
  694 {
  695         struct ieee80211vap *vap = selbs->ni_vap;
  696         struct ieee80211com *ic = selbs->ni_ic;
  697         struct ieee80211_node *obss;
  698         int canreassoc;
  699 
  700         /*
  701          * Committed to selbs, setup state.
  702          */
  703         obss = vap->iv_bss;
  704         /*
  705          * Check if old+new node have the same address in which
  706          * case we can reassociate when operating in sta mode.
  707          */
  708         canreassoc = (obss != NULL &&
  709                 vap->iv_state == IEEE80211_S_RUN &&
  710                 IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr));
  711         vap->iv_bss = selbs;            /* NB: caller assumed to bump refcnt */
  712         if (obss != NULL) {
  713                 copy_bss(selbs, obss);
  714                 ieee80211_node_decref(obss);    /* iv_bss reference */
  715                 ieee80211_free_node(obss);      /* station table reference */
  716                 obss = NULL;            /* NB: guard against later use */
  717         }
  718 
  719         /*
  720          * Delete unusable rates; we've already checked
  721          * that the negotiated rate set is acceptable.
  722          */
  723         ieee80211_fix_rate(vap->iv_bss, &vap->iv_bss->ni_rates,
  724                 IEEE80211_F_DODEL | IEEE80211_F_JOIN);
  725 
  726         ieee80211_setcurchan(ic, selbs->ni_chan);
  727         /*
  728          * Set the erp state (mostly the slot time) to deal with
  729          * the auto-select case; this should be redundant if the
  730          * mode is locked.
  731          */ 
  732         ieee80211_reset_erp(ic);
  733         ieee80211_wme_initparams(vap);
  734 
  735         if (vap->iv_opmode == IEEE80211_M_STA) {
  736                 if (canreassoc) {
  737                         /* Reassociate */
  738                         ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
  739                 } else {
  740                         /*
  741                          * Act as if we received a DEAUTH frame in case we
  742                          * are invoked from the RUN state.  This will cause
  743                          * us to try to re-authenticate if we are operating
  744                          * as a station.
  745                          */
  746                         ieee80211_new_state(vap, IEEE80211_S_AUTH,
  747                                 IEEE80211_FC0_SUBTYPE_DEAUTH);
  748                 }
  749         } else
  750                 ieee80211_new_state(vap, IEEE80211_S_RUN, -1);
  751         return 1;
  752 }
  753 
  754 int
  755 ieee80211_sta_join(struct ieee80211vap *vap, struct ieee80211_channel *chan,
  756         const struct ieee80211_scan_entry *se)
  757 {
  758         struct ieee80211com *ic = vap->iv_ic;
  759         struct ieee80211_node *ni;
  760 
  761         ni = ieee80211_alloc_node(&ic->ic_sta, vap, se->se_macaddr);
  762         if (ni == NULL) {
  763                 /* XXX msg */
  764                 return 0;
  765         }
  766         /*
  767          * Expand scan state into node's format.
  768          * XXX may not need all this stuff
  769          */
  770         IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
  771         ni->ni_esslen = se->se_ssid[1];
  772         memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen);
  773         ni->ni_tstamp.tsf = se->se_tstamp.tsf;
  774         ni->ni_intval = se->se_intval;
  775         ni->ni_capinfo = se->se_capinfo;
  776         ni->ni_chan = chan;
  777         ni->ni_timoff = se->se_timoff;
  778         ni->ni_fhdwell = se->se_fhdwell;
  779         ni->ni_fhindex = se->se_fhindex;
  780         ni->ni_erp = se->se_erp;
  781         IEEE80211_RSSI_LPF(ni->ni_avgrssi, se->se_rssi);
  782         ni->ni_noise = se->se_noise;
  783         if (vap->iv_opmode == IEEE80211_M_STA) {
  784                 /* NB: only infrastructure mode requires an associd */
  785                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
  786         }
  787 
  788         if (ieee80211_ies_init(&ni->ni_ies, se->se_ies.data, se->se_ies.len)) {
  789                 ieee80211_ies_expand(&ni->ni_ies);
  790 #ifdef IEEE80211_SUPPORT_SUPERG
  791                 if (ni->ni_ies.ath_ie != NULL)
  792                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
  793 #endif
  794                 if (ni->ni_ies.htcap_ie != NULL)
  795                         ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
  796                 if (ni->ni_ies.htinfo_ie != NULL)
  797                         ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
  798 #ifdef IEEE80211_SUPPORT_MESH
  799                 if (ni->ni_ies.meshid_ie != NULL)
  800                         ieee80211_parse_meshid(ni, ni->ni_ies.meshid_ie);
  801 #endif
  802 #ifdef IEEE80211_SUPPORT_TDMA
  803                 if (ni->ni_ies.tdma_ie != NULL)
  804                         ieee80211_parse_tdma(ni, ni->ni_ies.tdma_ie);
  805 #endif
  806         }
  807 
  808         vap->iv_dtim_period = se->se_dtimperiod;
  809         vap->iv_dtim_count = 0;
  810 
  811         /* NB: must be after ni_chan is setup */
  812         ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
  813                 IEEE80211_F_DOSORT);
  814         if (ieee80211_iserp_rateset(&ni->ni_rates))
  815                 ni->ni_flags |= IEEE80211_NODE_ERP;
  816         ieee80211_node_setuptxparms(ni);
  817         ieee80211_ratectl_node_init(ni);
  818 
  819         return ieee80211_sta_join1(ieee80211_ref_node(ni));
  820 }
  821 
  822 /*
  823  * Leave the specified IBSS/BSS network.  The node is assumed to
  824  * be passed in with a held reference.
  825  */
  826 void
  827 ieee80211_sta_leave(struct ieee80211_node *ni)
  828 {
  829         struct ieee80211com *ic = ni->ni_ic;
  830 
  831         ic->ic_node_cleanup(ni);
  832         ieee80211_notify_node_leave(ni);
  833 }
  834 
  835 /*
  836  * Send a deauthenticate frame and drop the station.
  837  */
  838 void
  839 ieee80211_node_deauth(struct ieee80211_node *ni, int reason)
  840 {
  841         /* NB: bump the refcnt to be sure temporay nodes are not reclaimed */
  842         ieee80211_ref_node(ni);
  843         if (ni->ni_associd != 0)
  844                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
  845         ieee80211_node_leave(ni);
  846         ieee80211_free_node(ni);
  847 }
  848 
  849 static struct ieee80211_node *
  850 node_alloc(struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
  851 {
  852         struct ieee80211_node *ni;
  853 
  854         ni = (struct ieee80211_node *) malloc(sizeof(struct ieee80211_node),
  855                 M_80211_NODE, M_NOWAIT | M_ZERO);
  856         return ni;
  857 }
  858 
  859 /*
  860  * Initialize an ie blob with the specified data.  If previous
  861  * data exists re-use the data block.  As a side effect we clear
  862  * all references to specific ie's; the caller is required to
  863  * recalculate them.
  864  */
  865 int
  866 ieee80211_ies_init(struct ieee80211_ies *ies, const uint8_t *data, int len)
  867 {
  868         /* NB: assumes data+len are the last fields */
  869         memset(ies, 0, offsetof(struct ieee80211_ies, data));
  870         if (ies->data != NULL && ies->len != len) {
  871                 /* data size changed */
  872                 free(ies->data, M_80211_NODE_IE);
  873                 ies->data = NULL;
  874         }
  875         if (ies->data == NULL) {
  876                 ies->data = (uint8_t *) malloc(len, M_80211_NODE_IE, M_NOWAIT);
  877                 if (ies->data == NULL) {
  878                         ies->len = 0;
  879                         /* NB: pointers have already been zero'd above */
  880                         return 0;
  881                 }
  882         }
  883         memcpy(ies->data, data, len);
  884         ies->len = len;
  885         return 1;
  886 }
  887 
  888 /*
  889  * Reclaim storage for an ie blob.
  890  */
  891 void
  892 ieee80211_ies_cleanup(struct ieee80211_ies *ies)
  893 {
  894         if (ies->data != NULL)
  895                 free(ies->data, M_80211_NODE_IE);
  896 }
  897 
  898 /*
  899  * Expand an ie blob data contents and to fillin individual
  900  * ie pointers.  The data blob is assumed to be well-formed;
  901  * we don't do any validity checking of ie lengths.
  902  */
  903 void
  904 ieee80211_ies_expand(struct ieee80211_ies *ies)
  905 {
  906         uint8_t *ie;
  907         int ielen;
  908 
  909         ie = ies->data;
  910         ielen = ies->len;
  911         while (ielen > 0) {
  912                 switch (ie[0]) {
  913                 case IEEE80211_ELEMID_VENDOR:
  914                         if (iswpaoui(ie))
  915                                 ies->wpa_ie = ie;
  916                         else if (iswmeoui(ie))
  917                                 ies->wme_ie = ie;
  918 #ifdef IEEE80211_SUPPORT_SUPERG
  919                         else if (isatherosoui(ie))
  920                                 ies->ath_ie = ie;
  921 #endif
  922 #ifdef IEEE80211_SUPPORT_TDMA
  923                         else if (istdmaoui(ie))
  924                                 ies->tdma_ie = ie;
  925 #endif
  926                         break;
  927                 case IEEE80211_ELEMID_RSN:
  928                         ies->rsn_ie = ie;
  929                         break;
  930                 case IEEE80211_ELEMID_HTCAP:
  931                         ies->htcap_ie = ie;
  932                         break;
  933 #ifdef IEEE80211_SUPPORT_MESH
  934                 case IEEE80211_ELEMID_MESHID:
  935                         ies->meshid_ie = ie;
  936                         break;
  937 #endif
  938                 }
  939                 ielen -= 2 + ie[1];
  940                 ie += 2 + ie[1];
  941         }
  942 }
  943 
  944 /*
  945  * Reclaim any resources in a node and reset any critical
  946  * state.  Typically nodes are free'd immediately after,
  947  * but in some cases the storage may be reused so we need
  948  * to insure consistent state (should probably fix that).
  949  */
  950 static void
  951 node_cleanup(struct ieee80211_node *ni)
  952 {
  953 #define N(a)    (sizeof(a)/sizeof(a[0]))
  954         struct ieee80211vap *vap = ni->ni_vap;
  955         struct ieee80211com *ic = ni->ni_ic;
  956         int i;
  957 
  958         /* NB: preserve ni_table */
  959         if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
  960                 if (vap->iv_opmode != IEEE80211_M_STA)
  961                         vap->iv_ps_sta--;
  962                 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  963                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  964                     "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
  965         }
  966         /*
  967          * Cleanup any HT-related state.
  968          */
  969         if (ni->ni_flags & IEEE80211_NODE_HT)
  970                 ieee80211_ht_node_cleanup(ni);
  971 #ifdef IEEE80211_SUPPORT_SUPERG
  972         else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
  973                 ieee80211_ff_node_cleanup(ni);
  974 #endif
  975 #ifdef IEEE80211_SUPPORT_MESH
  976         /*
  977          * Cleanup any mesh-related state.
  978          */
  979         if (vap->iv_opmode == IEEE80211_M_MBSS)
  980                 ieee80211_mesh_node_cleanup(ni);
  981 #endif
  982         /*
  983          * Clear any staging queue entries.
  984          */
  985         ieee80211_ageq_drain_node(&ic->ic_stageq, ni);
  986 
  987         /*
  988          * Clear AREF flag that marks the authorization refcnt bump
  989          * has happened.  This is probably not needed as the node
  990          * should always be removed from the table so not found but
  991          * do it just in case.
  992          * Likewise clear the ASSOCID flag as these flags are intended
  993          * to be managed in tandem.
  994          */
  995         ni->ni_flags &= ~(IEEE80211_NODE_AREF | IEEE80211_NODE_ASSOCID);
  996 
  997         /*
  998          * Drain power save queue and, if needed, clear TIM.
  999          */
 1000         if (ieee80211_node_psq_drain(ni) != 0 && vap->iv_set_tim != NULL)
 1001                 vap->iv_set_tim(ni, 0);
 1002 
 1003         ni->ni_associd = 0;
 1004         if (ni->ni_challenge != NULL) {
 1005                 free(ni->ni_challenge, M_80211_NODE);
 1006                 ni->ni_challenge = NULL;
 1007         }
 1008         /*
 1009          * Preserve SSID, WPA, and WME ie's so the bss node is
 1010          * reusable during a re-auth/re-assoc state transition.
 1011          * If we remove these data they will not be recreated
 1012          * because they come from a probe-response or beacon frame
 1013          * which cannot be expected prior to the association-response.
 1014          * This should not be an issue when operating in other modes
 1015          * as stations leaving always go through a full state transition
 1016          * which will rebuild this state.
 1017          *
 1018          * XXX does this leave us open to inheriting old state?
 1019          */
 1020         for (i = 0; i < N(ni->ni_rxfrag); i++)
 1021                 if (ni->ni_rxfrag[i] != NULL) {
 1022                         m_freem(ni->ni_rxfrag[i]);
 1023                         ni->ni_rxfrag[i] = NULL;
 1024                 }
 1025         /*
 1026          * Must be careful here to remove any key map entry w/o a LOR.
 1027          */
 1028         ieee80211_node_delucastkey(ni);
 1029 #undef N
 1030 }
 1031 
 1032 static void
 1033 node_free(struct ieee80211_node *ni)
 1034 {
 1035         struct ieee80211com *ic = ni->ni_ic;
 1036 
 1037         ieee80211_ratectl_node_deinit(ni);
 1038         ic->ic_node_cleanup(ni);
 1039         ieee80211_ies_cleanup(&ni->ni_ies);
 1040         ieee80211_psq_cleanup(&ni->ni_psq);
 1041         free(ni, M_80211_NODE);
 1042 }
 1043 
 1044 static void
 1045 node_age(struct ieee80211_node *ni)
 1046 {
 1047         struct ieee80211vap *vap = ni->ni_vap;
 1048 
 1049         IEEE80211_NODE_LOCK_ASSERT(&vap->iv_ic->ic_sta);
 1050 
 1051         /*
 1052          * Age frames on the power save queue.
 1053          */
 1054         if (ieee80211_node_psq_age(ni) != 0 &&
 1055             ni->ni_psq.psq_len == 0 && vap->iv_set_tim != NULL)
 1056                 vap->iv_set_tim(ni, 0);
 1057         /*
 1058          * Age out HT resources (e.g. frames on the
 1059          * A-MPDU reorder queues).
 1060          */
 1061         if (ni->ni_associd != 0 && (ni->ni_flags & IEEE80211_NODE_HT))
 1062                 ieee80211_ht_node_age(ni);
 1063 }
 1064 
 1065 static int8_t
 1066 node_getrssi(const struct ieee80211_node *ni)
 1067 {
 1068         uint32_t avgrssi = ni->ni_avgrssi;
 1069         int32_t rssi;
 1070 
 1071         if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER)
 1072                 return 0;
 1073         rssi = IEEE80211_RSSI_GET(avgrssi);
 1074         return rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
 1075 }
 1076 
 1077 static void
 1078 node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise)
 1079 {
 1080         *rssi = node_getrssi(ni);
 1081         *noise = ni->ni_noise;
 1082 }
 1083 
 1084 static void
 1085 node_getmimoinfo(const struct ieee80211_node *ni,
 1086         struct ieee80211_mimo_info *info)
 1087 {
 1088         int i;
 1089         uint32_t avgrssi;
 1090         int32_t rssi;
 1091 
 1092         bzero(info, sizeof(*info));
 1093 
 1094         for (i = 0; i < ni->ni_mimo_chains; i++) {
 1095                 avgrssi = ni->ni_mimo_rssi_ctl[i];
 1096                 if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER) {
 1097                         info->rssi[i] = 0;
 1098                 } else {
 1099                         rssi = IEEE80211_RSSI_GET(avgrssi);
 1100                         info->rssi[i] = rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
 1101                 }
 1102                 info->noise[i] = ni->ni_mimo_noise_ctl[i];
 1103         }
 1104 
 1105         /* XXX ext radios? */
 1106 
 1107         /* XXX EVM? */
 1108 }
 1109 
 1110 struct ieee80211_node *
 1111 ieee80211_alloc_node(struct ieee80211_node_table *nt,
 1112         struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1113 {
 1114         struct ieee80211com *ic = nt->nt_ic;
 1115         struct ieee80211_node *ni;
 1116         int hash;
 1117 
 1118         ni = ic->ic_node_alloc(vap, macaddr);
 1119         if (ni == NULL) {
 1120                 vap->iv_stats.is_rx_nodealloc++;
 1121                 return NULL;
 1122         }
 1123 
 1124         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1125                 "%s %p<%s> in %s table\n", __func__, ni,
 1126                 ether_sprintf(macaddr), nt->nt_name);
 1127 
 1128         IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
 1129         hash = IEEE80211_NODE_HASH(ic, macaddr);
 1130         ieee80211_node_initref(ni);             /* mark referenced */
 1131         ni->ni_chan = IEEE80211_CHAN_ANYC;
 1132         ni->ni_authmode = IEEE80211_AUTH_OPEN;
 1133         ni->ni_txpower = ic->ic_txpowlimit;     /* max power */
 1134         ni->ni_txparms = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
 1135         ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
 1136         ni->ni_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
 1137         ni->ni_inact_reload = nt->nt_inact_init;
 1138         ni->ni_inact = ni->ni_inact_reload;
 1139         ni->ni_ath_defkeyix = 0x7fff;
 1140         ieee80211_psq_init(&ni->ni_psq, "unknown");
 1141 #ifdef IEEE80211_SUPPORT_MESH
 1142         if (vap->iv_opmode == IEEE80211_M_MBSS)
 1143                 ieee80211_mesh_node_init(vap, ni);
 1144 #endif
 1145         IEEE80211_NODE_LOCK(nt);
 1146         TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
 1147         LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
 1148         ni->ni_table = nt;
 1149         ni->ni_vap = vap;
 1150         ni->ni_ic = ic;
 1151         IEEE80211_NODE_UNLOCK(nt);
 1152 
 1153         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 1154             "%s: inact_reload %u", __func__, ni->ni_inact_reload);
 1155 
 1156         ieee80211_ratectl_node_init(ni);
 1157 
 1158         return ni;
 1159 }
 1160 
 1161 /*
 1162  * Craft a temporary node suitable for sending a management frame
 1163  * to the specified station.  We craft only as much state as we
 1164  * need to do the work since the node will be immediately reclaimed
 1165  * once the send completes.
 1166  */
 1167 struct ieee80211_node *
 1168 ieee80211_tmp_node(struct ieee80211vap *vap,
 1169         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1170 {
 1171         struct ieee80211com *ic = vap->iv_ic;
 1172         struct ieee80211_node *ni;
 1173 
 1174         ni = ic->ic_node_alloc(vap, macaddr);
 1175         if (ni != NULL) {
 1176                 struct ieee80211_node *bss = vap->iv_bss;
 1177 
 1178                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1179                         "%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
 1180 
 1181                 ni->ni_table = NULL;            /* NB: pedantic */
 1182                 ni->ni_ic = ic;                 /* NB: needed to set channel */
 1183                 ni->ni_vap = vap;
 1184 
 1185                 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
 1186                 IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
 1187                 ieee80211_node_initref(ni);             /* mark referenced */
 1188                 /* NB: required by ieee80211_fix_rate */
 1189                 ieee80211_node_set_chan(ni, bss->ni_chan);
 1190                 ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
 1191                         IEEE80211_KEYIX_NONE);
 1192                 ni->ni_txpower = bss->ni_txpower;
 1193                 /* XXX optimize away */
 1194                 ieee80211_psq_init(&ni->ni_psq, "unknown");
 1195 
 1196                 ieee80211_ratectl_node_init(ni);
 1197         } else {
 1198                 /* XXX msg */
 1199                 vap->iv_stats.is_rx_nodealloc++;
 1200         }
 1201         return ni;
 1202 }
 1203 
 1204 struct ieee80211_node *
 1205 ieee80211_dup_bss(struct ieee80211vap *vap,
 1206         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1207 {
 1208         struct ieee80211com *ic = vap->iv_ic;
 1209         struct ieee80211_node *ni;
 1210 
 1211         ni = ieee80211_alloc_node(&ic->ic_sta, vap, macaddr);
 1212         if (ni != NULL) {
 1213                 struct ieee80211_node *bss = vap->iv_bss;
 1214                 /*
 1215                  * Inherit from iv_bss.
 1216                  */
 1217                 copy_bss(ni, bss);
 1218                 IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
 1219                 ieee80211_node_set_chan(ni, bss->ni_chan);
 1220         }
 1221         return ni;
 1222 }
 1223 
 1224 /*
 1225  * Create a bss node for a legacy WDS vap.  The far end does
 1226  * not associate so we just create create a new node and
 1227  * simulate an association.  The caller is responsible for
 1228  * installing the node as the bss node and handling any further
 1229  * setup work like authorizing the port.
 1230  */
 1231 struct ieee80211_node *
 1232 ieee80211_node_create_wds(struct ieee80211vap *vap,
 1233         const uint8_t bssid[IEEE80211_ADDR_LEN], struct ieee80211_channel *chan)
 1234 {
 1235         struct ieee80211com *ic = vap->iv_ic;
 1236         struct ieee80211_node *ni;
 1237 
 1238         /* XXX check if node already in sta table? */
 1239         ni = ieee80211_alloc_node(&ic->ic_sta, vap, bssid);
 1240         if (ni != NULL) {
 1241                 ni->ni_wdsvap = vap;
 1242                 IEEE80211_ADDR_COPY(ni->ni_bssid, bssid);
 1243                 /*
 1244                  * Inherit any manually configured settings.
 1245                  */
 1246                 copy_bss(ni, vap->iv_bss);
 1247                 ieee80211_node_set_chan(ni, chan);
 1248                 /* NB: propagate ssid so available to WPA supplicant */
 1249                 ni->ni_esslen = vap->iv_des_ssid[0].len;
 1250                 memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
 1251                 /* NB: no associd for peer */
 1252                 /*
 1253                  * There are no management frames to use to
 1254                  * discover neighbor capabilities, so blindly
 1255                  * propagate the local configuration.
 1256                  */
 1257                 if (vap->iv_flags & IEEE80211_F_WME)
 1258                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1259 #ifdef IEEE80211_SUPPORT_SUPERG
 1260                 if (vap->iv_flags & IEEE80211_F_FF)
 1261                         ni->ni_flags |= IEEE80211_NODE_FF;
 1262 #endif
 1263                 if ((ic->ic_htcaps & IEEE80211_HTC_HT) &&
 1264                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1265                         /*
 1266                          * Device is HT-capable and HT is enabled for
 1267                          * the vap; setup HT operation.  On return
 1268                          * ni_chan will be adjusted to an HT channel.
 1269                          */
 1270                         ieee80211_ht_wds_init(ni);
 1271                 } else {
 1272                         struct ieee80211_channel *c = ni->ni_chan;
 1273                         /*
 1274                          * Force a legacy channel to be used.
 1275                          */
 1276                         c = ieee80211_find_channel(ic,
 1277                             c->ic_freq, c->ic_flags &~ IEEE80211_CHAN_HT);
 1278                         KASSERT(c != NULL, ("no legacy channel, %u/%x",
 1279                             ni->ni_chan->ic_freq, ni->ni_chan->ic_flags));
 1280                         ni->ni_chan = c;
 1281                 }
 1282         }
 1283         return ni;
 1284 }
 1285 
 1286 struct ieee80211_node *
 1287 #ifdef IEEE80211_DEBUG_REFCNT
 1288 ieee80211_find_node_locked_debug(struct ieee80211_node_table *nt,
 1289         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1290 #else
 1291 ieee80211_find_node_locked(struct ieee80211_node_table *nt,
 1292         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1293 #endif
 1294 {
 1295         struct ieee80211_node *ni;
 1296         int hash;
 1297 
 1298         IEEE80211_NODE_LOCK_ASSERT(nt);
 1299 
 1300         hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
 1301         LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
 1302                 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
 1303                         ieee80211_ref_node(ni); /* mark referenced */
 1304 #ifdef IEEE80211_DEBUG_REFCNT
 1305                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1306                             "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
 1307                             func, line,
 1308                             ni, ether_sprintf(ni->ni_macaddr),
 1309                             ieee80211_node_refcnt(ni));
 1310 #endif
 1311                         return ni;
 1312                 }
 1313         }
 1314         return NULL;
 1315 }
 1316 
 1317 struct ieee80211_node *
 1318 #ifdef IEEE80211_DEBUG_REFCNT
 1319 ieee80211_find_node_debug(struct ieee80211_node_table *nt,
 1320         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1321 #else
 1322 ieee80211_find_node(struct ieee80211_node_table *nt,
 1323         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1324 #endif
 1325 {
 1326         struct ieee80211_node *ni;
 1327 
 1328         IEEE80211_NODE_LOCK(nt);
 1329         ni = ieee80211_find_node_locked(nt, macaddr);
 1330         IEEE80211_NODE_UNLOCK(nt);
 1331         return ni;
 1332 }
 1333 
 1334 struct ieee80211_node *
 1335 #ifdef IEEE80211_DEBUG_REFCNT
 1336 ieee80211_find_vap_node_locked_debug(struct ieee80211_node_table *nt,
 1337         const struct ieee80211vap *vap,
 1338         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1339 #else
 1340 ieee80211_find_vap_node_locked(struct ieee80211_node_table *nt,
 1341         const struct ieee80211vap *vap,
 1342         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1343 #endif
 1344 {
 1345         struct ieee80211_node *ni;
 1346         int hash;
 1347 
 1348         IEEE80211_NODE_LOCK_ASSERT(nt);
 1349 
 1350         hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
 1351         LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
 1352                 if (ni->ni_vap == vap &&
 1353                     IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
 1354                         ieee80211_ref_node(ni); /* mark referenced */
 1355 #ifdef IEEE80211_DEBUG_REFCNT
 1356                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1357                             "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
 1358                             func, line,
 1359                             ni, ether_sprintf(ni->ni_macaddr),
 1360                             ieee80211_node_refcnt(ni));
 1361 #endif
 1362                         return ni;
 1363                 }
 1364         }
 1365         return NULL;
 1366 }
 1367 
 1368 struct ieee80211_node *
 1369 #ifdef IEEE80211_DEBUG_REFCNT
 1370 ieee80211_find_vap_node_debug(struct ieee80211_node_table *nt,
 1371         const struct ieee80211vap *vap,
 1372         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1373 #else
 1374 ieee80211_find_vap_node(struct ieee80211_node_table *nt,
 1375         const struct ieee80211vap *vap,
 1376         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1377 #endif
 1378 {
 1379         struct ieee80211_node *ni;
 1380 
 1381         IEEE80211_NODE_LOCK(nt);
 1382         ni = ieee80211_find_vap_node_locked(nt, vap, macaddr);
 1383         IEEE80211_NODE_UNLOCK(nt);
 1384         return ni;
 1385 }
 1386 
 1387 /*
 1388  * Fake up a node; this handles node discovery in adhoc mode.
 1389  * Note that for the driver's benefit we we treat this like
 1390  * an association so the driver has an opportunity to setup
 1391  * it's private state.
 1392  */
 1393 struct ieee80211_node *
 1394 ieee80211_fakeup_adhoc_node(struct ieee80211vap *vap,
 1395         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1396 {
 1397         struct ieee80211_node *ni;
 1398 
 1399         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1400             "%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
 1401         ni = ieee80211_dup_bss(vap, macaddr);
 1402         if (ni != NULL) {
 1403                 struct ieee80211com *ic = vap->iv_ic;
 1404 
 1405                 /* XXX no rate negotiation; just dup */
 1406                 ni->ni_rates = vap->iv_bss->ni_rates;
 1407                 if (ieee80211_iserp_rateset(&ni->ni_rates))
 1408                         ni->ni_flags |= IEEE80211_NODE_ERP;
 1409                 if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
 1410                         /*
 1411                          * In adhoc demo mode there are no management
 1412                          * frames to use to discover neighbor capabilities,
 1413                          * so blindly propagate the local configuration 
 1414                          * so we can do interesting things (e.g. use
 1415                          * WME to disable ACK's).
 1416                          */
 1417                         if (vap->iv_flags & IEEE80211_F_WME)
 1418                                 ni->ni_flags |= IEEE80211_NODE_QOS;
 1419 #ifdef IEEE80211_SUPPORT_SUPERG
 1420                         if (vap->iv_flags & IEEE80211_F_FF)
 1421                                 ni->ni_flags |= IEEE80211_NODE_FF;
 1422 #endif
 1423                 }
 1424                 ieee80211_node_setuptxparms(ni);
 1425                 ieee80211_ratectl_node_init(ni);
 1426                 if (ic->ic_newassoc != NULL)
 1427                         ic->ic_newassoc(ni, 1);
 1428                 /* XXX not right for 802.1x/WPA */
 1429                 ieee80211_node_authorize(ni);
 1430         }
 1431         return ni;
 1432 }
 1433 
 1434 void
 1435 ieee80211_init_neighbor(struct ieee80211_node *ni,
 1436         const struct ieee80211_frame *wh,
 1437         const struct ieee80211_scanparams *sp)
 1438 {
 1439         ni->ni_esslen = sp->ssid[1];
 1440         memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
 1441         IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
 1442         memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
 1443         ni->ni_intval = sp->bintval;
 1444         ni->ni_capinfo = sp->capinfo;
 1445         ni->ni_chan = ni->ni_ic->ic_curchan;
 1446         ni->ni_fhdwell = sp->fhdwell;
 1447         ni->ni_fhindex = sp->fhindex;
 1448         ni->ni_erp = sp->erp;
 1449         ni->ni_timoff = sp->timoff;
 1450 #ifdef IEEE80211_SUPPORT_MESH
 1451         if (ni->ni_vap->iv_opmode == IEEE80211_M_MBSS)
 1452                 ieee80211_mesh_init_neighbor(ni, wh, sp);
 1453 #endif
 1454         if (ieee80211_ies_init(&ni->ni_ies, sp->ies, sp->ies_len)) {
 1455                 ieee80211_ies_expand(&ni->ni_ies);
 1456                 if (ni->ni_ies.wme_ie != NULL)
 1457                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1458                 else
 1459                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
 1460 #ifdef IEEE80211_SUPPORT_SUPERG
 1461                 if (ni->ni_ies.ath_ie != NULL)
 1462                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
 1463 #endif
 1464         }
 1465 
 1466         /* NB: must be after ni_chan is setup */
 1467         ieee80211_setup_rates(ni, sp->rates, sp->xrates,
 1468                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1469                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1470 }
 1471 
 1472 /*
 1473  * Do node discovery in adhoc mode on receipt of a beacon
 1474  * or probe response frame.  Note that for the driver's
 1475  * benefit we we treat this like an association so the
 1476  * driver has an opportunity to setup it's private state.
 1477  */
 1478 struct ieee80211_node *
 1479 ieee80211_add_neighbor(struct ieee80211vap *vap,
 1480         const struct ieee80211_frame *wh,
 1481         const struct ieee80211_scanparams *sp)
 1482 {
 1483         struct ieee80211_node *ni;
 1484 
 1485         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1486             "%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
 1487         ni = ieee80211_dup_bss(vap, wh->i_addr2);/* XXX alloc_node? */
 1488         if (ni != NULL) {
 1489                 struct ieee80211com *ic = vap->iv_ic;
 1490 
 1491                 ieee80211_init_neighbor(ni, wh, sp);
 1492                 if (ieee80211_iserp_rateset(&ni->ni_rates))
 1493                         ni->ni_flags |= IEEE80211_NODE_ERP;
 1494                 ieee80211_node_setuptxparms(ni);
 1495                 ieee80211_ratectl_node_init(ni);
 1496                 if (ic->ic_newassoc != NULL)
 1497                         ic->ic_newassoc(ni, 1);
 1498                 /* XXX not right for 802.1x/WPA */
 1499                 ieee80211_node_authorize(ni);
 1500         }
 1501         return ni;
 1502 }
 1503 
 1504 #define IS_PROBEREQ(wh) \
 1505         ((wh->i_fc[0] & (IEEE80211_FC0_TYPE_MASK|IEEE80211_FC0_SUBTYPE_MASK)) \
 1506             == (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ))
 1507 #define IS_BCAST_PROBEREQ(wh) \
 1508         (IS_PROBEREQ(wh) && IEEE80211_IS_MULTICAST( \
 1509             ((const struct ieee80211_frame *)(wh))->i_addr3))
 1510 
 1511 static __inline struct ieee80211_node *
 1512 _find_rxnode(struct ieee80211_node_table *nt,
 1513     const struct ieee80211_frame_min *wh)
 1514 {
 1515         if (IS_BCAST_PROBEREQ(wh))
 1516                 return NULL;            /* spam bcast probe req to all vap's */
 1517         return ieee80211_find_node_locked(nt, wh->i_addr2);
 1518 }
 1519 
 1520 /*
 1521  * Locate the node for sender, track state, and then pass the
 1522  * (referenced) node up to the 802.11 layer for its use.  Note
 1523  * we can return NULL if the sender is not in the table.
 1524  */
 1525 struct ieee80211_node *
 1526 #ifdef IEEE80211_DEBUG_REFCNT
 1527 ieee80211_find_rxnode_debug(struct ieee80211com *ic,
 1528         const struct ieee80211_frame_min *wh, const char *func, int line)
 1529 #else
 1530 ieee80211_find_rxnode(struct ieee80211com *ic,
 1531         const struct ieee80211_frame_min *wh)
 1532 #endif
 1533 {
 1534         struct ieee80211_node_table *nt;
 1535         struct ieee80211_node *ni;
 1536 
 1537         nt = &ic->ic_sta;
 1538         IEEE80211_NODE_LOCK(nt);
 1539         ni = _find_rxnode(nt, wh);
 1540         IEEE80211_NODE_UNLOCK(nt);
 1541 
 1542         return ni;
 1543 }
 1544 
 1545 /*
 1546  * Like ieee80211_find_rxnode but use the supplied h/w
 1547  * key index as a hint to locate the node in the key
 1548  * mapping table.  If an entry is present at the key
 1549  * index we return it; otherwise do a normal lookup and
 1550  * update the mapping table if the station has a unicast
 1551  * key assigned to it.
 1552  */
 1553 struct ieee80211_node *
 1554 #ifdef IEEE80211_DEBUG_REFCNT
 1555 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
 1556         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
 1557         const char *func, int line)
 1558 #else
 1559 ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
 1560         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
 1561 #endif
 1562 {
 1563         struct ieee80211_node_table *nt;
 1564         struct ieee80211_node *ni;
 1565 
 1566         nt = &ic->ic_sta;
 1567         IEEE80211_NODE_LOCK(nt);
 1568         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
 1569                 ni = nt->nt_keyixmap[keyix];
 1570         else
 1571                 ni = NULL;
 1572         if (ni == NULL) {
 1573                 ni = _find_rxnode(nt, wh);
 1574                 if (ni != NULL && nt->nt_keyixmap != NULL) {
 1575                         /*
 1576                          * If the station has a unicast key cache slot
 1577                          * assigned update the key->node mapping table.
 1578                          */
 1579                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1580                         /* XXX can keyixmap[keyix] != NULL? */
 1581                         if (keyix < nt->nt_keyixmax &&
 1582                             nt->nt_keyixmap[keyix] == NULL) {
 1583                                 IEEE80211_DPRINTF(ni->ni_vap,
 1584                                     IEEE80211_MSG_NODE,
 1585                                     "%s: add key map entry %p<%s> refcnt %d\n",
 1586                                     __func__, ni, ether_sprintf(ni->ni_macaddr),
 1587                                     ieee80211_node_refcnt(ni)+1);
 1588                                 nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
 1589                         }
 1590                 }
 1591         } else {
 1592                 if (IS_BCAST_PROBEREQ(wh))
 1593                         ni = NULL;      /* spam bcast probe req to all vap's */
 1594                 else
 1595                         ieee80211_ref_node(ni);
 1596         }
 1597         IEEE80211_NODE_UNLOCK(nt);
 1598 
 1599         return ni;
 1600 }
 1601 #undef IS_BCAST_PROBEREQ
 1602 #undef IS_PROBEREQ
 1603 
 1604 /*
 1605  * Return a reference to the appropriate node for sending
 1606  * a data frame.  This handles node discovery in adhoc networks.
 1607  */
 1608 struct ieee80211_node *
 1609 #ifdef IEEE80211_DEBUG_REFCNT
 1610 ieee80211_find_txnode_debug(struct ieee80211vap *vap,
 1611         const uint8_t macaddr[IEEE80211_ADDR_LEN],
 1612         const char *func, int line)
 1613 #else
 1614 ieee80211_find_txnode(struct ieee80211vap *vap,
 1615         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1616 #endif
 1617 {
 1618         struct ieee80211_node_table *nt = &vap->iv_ic->ic_sta;
 1619         struct ieee80211_node *ni;
 1620 
 1621         /*
 1622          * The destination address should be in the node table
 1623          * unless this is a multicast/broadcast frame.  We can
 1624          * also optimize station mode operation, all frames go
 1625          * to the bss node.
 1626          */
 1627         /* XXX can't hold lock across dup_bss 'cuz of recursive locking */
 1628         IEEE80211_NODE_LOCK(nt);
 1629         if (vap->iv_opmode == IEEE80211_M_STA ||
 1630             vap->iv_opmode == IEEE80211_M_WDS ||
 1631             IEEE80211_IS_MULTICAST(macaddr))
 1632                 ni = ieee80211_ref_node(vap->iv_bss);
 1633         else
 1634                 ni = ieee80211_find_node_locked(nt, macaddr);
 1635         IEEE80211_NODE_UNLOCK(nt);
 1636 
 1637         if (ni == NULL) {
 1638                 if (vap->iv_opmode == IEEE80211_M_IBSS ||
 1639                     vap->iv_opmode == IEEE80211_M_AHDEMO) {
 1640                         /*
 1641                          * In adhoc mode cons up a node for the destination.
 1642                          * Note that we need an additional reference for the
 1643                          * caller to be consistent with
 1644                          * ieee80211_find_node_locked.
 1645                          */
 1646                         ni = ieee80211_fakeup_adhoc_node(vap, macaddr);
 1647                         if (ni != NULL)
 1648                                 (void) ieee80211_ref_node(ni);
 1649                 } else {
 1650                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, macaddr,
 1651                             "no node, discard frame (%s)", __func__);
 1652                         vap->iv_stats.is_tx_nonode++;
 1653                 }
 1654         }
 1655         return ni;
 1656 }
 1657 
 1658 static void
 1659 _ieee80211_free_node(struct ieee80211_node *ni)
 1660 {
 1661         struct ieee80211_node_table *nt = ni->ni_table;
 1662 
 1663         /*
 1664          * NB: careful about referencing the vap as it may be
 1665          * gone if the last reference was held by a driver.
 1666          * We know the com will always be present so it's safe
 1667          * to use ni_ic below to reclaim resources.
 1668          */
 1669 #if 0
 1670         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1671                 "%s %p<%s> in %s table\n", __func__, ni,
 1672                 ether_sprintf(ni->ni_macaddr),
 1673                 nt != NULL ? nt->nt_name : "<gone>");
 1674 #endif
 1675         if (ni->ni_associd != 0) {
 1676                 struct ieee80211vap *vap = ni->ni_vap;
 1677                 if (vap->iv_aid_bitmap != NULL)
 1678                         IEEE80211_AID_CLR(vap, ni->ni_associd);
 1679         }
 1680         if (nt != NULL) {
 1681                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1682                 LIST_REMOVE(ni, ni_hash);
 1683         }
 1684         ni->ni_ic->ic_node_free(ni);
 1685 }
 1686 
 1687 void
 1688 #ifdef IEEE80211_DEBUG_REFCNT
 1689 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
 1690 #else
 1691 ieee80211_free_node(struct ieee80211_node *ni)
 1692 #endif
 1693 {
 1694         struct ieee80211_node_table *nt = ni->ni_table;
 1695 
 1696 #ifdef IEEE80211_DEBUG_REFCNT
 1697         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1698                 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
 1699                  ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
 1700 #endif
 1701         if (nt != NULL) {
 1702                 IEEE80211_NODE_LOCK(nt);
 1703                 if (ieee80211_node_dectestref(ni)) {
 1704                         /*
 1705                          * Last reference, reclaim state.
 1706                          */
 1707                         _ieee80211_free_node(ni);
 1708                 } else if (ieee80211_node_refcnt(ni) == 1 &&
 1709                     nt->nt_keyixmap != NULL) {
 1710                         ieee80211_keyix keyix;
 1711                         /*
 1712                          * Check for a last reference in the key mapping table.
 1713                          */
 1714                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1715                         if (keyix < nt->nt_keyixmax &&
 1716                             nt->nt_keyixmap[keyix] == ni) {
 1717                                 IEEE80211_DPRINTF(ni->ni_vap,
 1718                                     IEEE80211_MSG_NODE,
 1719                                     "%s: %p<%s> clear key map entry", __func__,
 1720                                     ni, ether_sprintf(ni->ni_macaddr));
 1721                                 nt->nt_keyixmap[keyix] = NULL;
 1722                                 ieee80211_node_decref(ni); /* XXX needed? */
 1723                                 _ieee80211_free_node(ni);
 1724                         }
 1725                 }
 1726                 IEEE80211_NODE_UNLOCK(nt);
 1727         } else {
 1728                 if (ieee80211_node_dectestref(ni))
 1729                         _ieee80211_free_node(ni);
 1730         }
 1731 }
 1732 
 1733 /*
 1734  * Reclaim a unicast key and clear any key cache state.
 1735  */
 1736 int
 1737 ieee80211_node_delucastkey(struct ieee80211_node *ni)
 1738 {
 1739         struct ieee80211com *ic = ni->ni_ic;
 1740         struct ieee80211_node_table *nt = &ic->ic_sta;
 1741         struct ieee80211_node *nikey;
 1742         ieee80211_keyix keyix;
 1743         int isowned, status;
 1744 
 1745         /*
 1746          * NB: We must beware of LOR here; deleting the key
 1747          * can cause the crypto layer to block traffic updates
 1748          * which can generate a LOR against the node table lock;
 1749          * grab it here and stash the key index for our use below.
 1750          *
 1751          * Must also beware of recursion on the node table lock.
 1752          * When called from node_cleanup we may already have
 1753          * the node table lock held.  Unfortunately there's no
 1754          * way to separate out this path so we must do this
 1755          * conditionally.
 1756          */
 1757         isowned = IEEE80211_NODE_IS_LOCKED(nt);
 1758         if (!isowned)
 1759                 IEEE80211_NODE_LOCK(nt);
 1760         nikey = NULL;
 1761         status = 1;             /* NB: success */
 1762         if (ni->ni_ucastkey.wk_keyix != IEEE80211_KEYIX_NONE) {
 1763                 keyix = ni->ni_ucastkey.wk_rxkeyix;
 1764                 status = ieee80211_crypto_delkey(ni->ni_vap, &ni->ni_ucastkey);
 1765                 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
 1766                         nikey = nt->nt_keyixmap[keyix];
 1767                         nt->nt_keyixmap[keyix] = NULL;
 1768                 }
 1769         }
 1770         if (!isowned)
 1771                 IEEE80211_NODE_UNLOCK(nt);
 1772 
 1773         if (nikey != NULL) {
 1774                 KASSERT(nikey == ni,
 1775                         ("key map out of sync, ni %p nikey %p", ni, nikey));
 1776                 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1777                         "%s: delete key map entry %p<%s> refcnt %d\n",
 1778                         __func__, ni, ether_sprintf(ni->ni_macaddr),
 1779                         ieee80211_node_refcnt(ni)-1);
 1780                 ieee80211_free_node(ni);
 1781         }
 1782         return status;
 1783 }
 1784 
 1785 /*
 1786  * Reclaim a node.  If this is the last reference count then
 1787  * do the normal free work.  Otherwise remove it from the node
 1788  * table and mark it gone by clearing the back-reference.
 1789  */
 1790 static void
 1791 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 1792 {
 1793         ieee80211_keyix keyix;
 1794 
 1795         IEEE80211_NODE_LOCK_ASSERT(nt);
 1796 
 1797         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1798                 "%s: remove %p<%s> from %s table, refcnt %d\n",
 1799                 __func__, ni, ether_sprintf(ni->ni_macaddr),
 1800                 nt->nt_name, ieee80211_node_refcnt(ni)-1);
 1801         /*
 1802          * Clear any entry in the unicast key mapping table.
 1803          * We need to do it here so rx lookups don't find it
 1804          * in the mapping table even if it's not in the hash
 1805          * table.  We cannot depend on the mapping table entry
 1806          * being cleared because the node may not be free'd.
 1807          */
 1808         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1809         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
 1810             nt->nt_keyixmap[keyix] == ni) {
 1811                 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1812                         "%s: %p<%s> clear key map entry %u\n",
 1813                         __func__, ni, ether_sprintf(ni->ni_macaddr), keyix);
 1814                 nt->nt_keyixmap[keyix] = NULL;
 1815                 ieee80211_node_decref(ni);      /* NB: don't need free */
 1816         }
 1817         if (!ieee80211_node_dectestref(ni)) {
 1818                 /*
 1819                  * Other references are present, just remove the
 1820                  * node from the table so it cannot be found.  When
 1821                  * the references are dropped storage will be
 1822                  * reclaimed.
 1823                  */
 1824                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1825                 LIST_REMOVE(ni, ni_hash);
 1826                 ni->ni_table = NULL;            /* clear reference */
 1827         } else
 1828                 _ieee80211_free_node(ni);
 1829 }
 1830 
 1831 /*
 1832  * Node table support.
 1833  */
 1834 
 1835 static void
 1836 ieee80211_node_table_init(struct ieee80211com *ic,
 1837         struct ieee80211_node_table *nt,
 1838         const char *name, int inact, int keyixmax)
 1839 {
 1840         struct ifnet *ifp = ic->ic_ifp;
 1841 
 1842         nt->nt_ic = ic;
 1843         IEEE80211_NODE_LOCK_INIT(nt, ifp->if_xname);
 1844         IEEE80211_NODE_ITERATE_LOCK_INIT(nt, ifp->if_xname);
 1845         TAILQ_INIT(&nt->nt_node);
 1846         nt->nt_name = name;
 1847         nt->nt_scangen = 1;
 1848         nt->nt_inact_init = inact;
 1849         nt->nt_keyixmax = keyixmax;
 1850         if (nt->nt_keyixmax > 0) {
 1851                 nt->nt_keyixmap = (struct ieee80211_node **) malloc(
 1852                         keyixmax * sizeof(struct ieee80211_node *),
 1853                         M_80211_NODE, M_NOWAIT | M_ZERO);
 1854                 if (nt->nt_keyixmap == NULL)
 1855                         if_printf(ic->ic_ifp,
 1856                             "Cannot allocate key index map with %u entries\n",
 1857                             keyixmax);
 1858         } else
 1859                 nt->nt_keyixmap = NULL;
 1860 }
 1861 
 1862 static void
 1863 ieee80211_node_table_reset(struct ieee80211_node_table *nt,
 1864         struct ieee80211vap *match)
 1865 {
 1866         struct ieee80211_node *ni, *next;
 1867 
 1868         IEEE80211_NODE_LOCK(nt);
 1869         TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next) {
 1870                 if (match != NULL && ni->ni_vap != match)
 1871                         continue;
 1872                 /* XXX can this happen?  if so need's work */
 1873                 if (ni->ni_associd != 0) {
 1874                         struct ieee80211vap *vap = ni->ni_vap;
 1875 
 1876                         if (vap->iv_auth->ia_node_leave != NULL)
 1877                                 vap->iv_auth->ia_node_leave(ni);
 1878                         if (vap->iv_aid_bitmap != NULL)
 1879                                 IEEE80211_AID_CLR(vap, ni->ni_associd);
 1880                 }
 1881                 ni->ni_wdsvap = NULL;           /* clear reference */
 1882                 node_reclaim(nt, ni);
 1883         }
 1884         if (match != NULL && match->iv_opmode == IEEE80211_M_WDS) {
 1885                 /*
 1886                  * Make a separate pass to clear references to this vap
 1887                  * held by DWDS entries.  They will not be matched above
 1888                  * because ni_vap will point to the ap vap but we still
 1889                  * need to clear ni_wdsvap when the WDS vap is destroyed
 1890                  * and/or reset.
 1891                  */
 1892                 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next)
 1893                         if (ni->ni_wdsvap == match)
 1894                                 ni->ni_wdsvap = NULL;
 1895         }
 1896         IEEE80211_NODE_UNLOCK(nt);
 1897 }
 1898 
 1899 static void
 1900 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
 1901 {
 1902         ieee80211_node_table_reset(nt, NULL);
 1903         if (nt->nt_keyixmap != NULL) {
 1904 #ifdef DIAGNOSTIC
 1905                 /* XXX verify all entries are NULL */
 1906                 int i;
 1907                 for (i = 0; i < nt->nt_keyixmax; i++)
 1908                         if (nt->nt_keyixmap[i] != NULL)
 1909                                 printf("%s: %s[%u] still active\n", __func__,
 1910                                         nt->nt_name, i);
 1911 #endif
 1912                 free(nt->nt_keyixmap, M_80211_NODE);
 1913                 nt->nt_keyixmap = NULL;
 1914         }
 1915         IEEE80211_NODE_ITERATE_LOCK_DESTROY(nt);
 1916         IEEE80211_NODE_LOCK_DESTROY(nt);
 1917 }
 1918 
 1919 /*
 1920  * Timeout inactive stations and do related housekeeping.
 1921  * Note that we cannot hold the node lock while sending a
 1922  * frame as this would lead to a LOR.  Instead we use a
 1923  * generation number to mark nodes that we've scanned and
 1924  * drop the lock and restart a scan if we have to time out
 1925  * a node.  Since we are single-threaded by virtue of
 1926  * controlling the inactivity timer we can be sure this will
 1927  * process each node only once.
 1928  */
 1929 static void
 1930 ieee80211_timeout_stations(struct ieee80211com *ic)
 1931 {
 1932         struct ieee80211_node_table *nt = &ic->ic_sta;
 1933         struct ieee80211vap *vap;
 1934         struct ieee80211_node *ni;
 1935         int gen = 0;
 1936 
 1937         IEEE80211_NODE_ITERATE_LOCK(nt);
 1938         gen = ++nt->nt_scangen;
 1939 restart:
 1940         IEEE80211_NODE_LOCK(nt);
 1941         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 1942                 if (ni->ni_scangen == gen)      /* previously handled */
 1943                         continue;
 1944                 ni->ni_scangen = gen;
 1945                 /*
 1946                  * Ignore entries for which have yet to receive an
 1947                  * authentication frame.  These are transient and
 1948                  * will be reclaimed when the last reference to them
 1949                  * goes away (when frame xmits complete).
 1950                  */
 1951                 vap = ni->ni_vap;
 1952                 /*
 1953                  * Only process stations when in RUN state.  This
 1954                  * insures, for example, that we don't timeout an
 1955                  * inactive station during CAC.  Note that CSA state
 1956                  * is actually handled in ieee80211_node_timeout as
 1957                  * it applies to more than timeout processing.
 1958                  */
 1959                 if (vap->iv_state != IEEE80211_S_RUN)
 1960                         continue;
 1961                 /* XXX can vap be NULL? */
 1962                 if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
 1963                      vap->iv_opmode == IEEE80211_M_STA) &&
 1964                     (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 1965                         continue;
 1966                 /*
 1967                  * Free fragment if not needed anymore
 1968                  * (last fragment older than 1s).
 1969                  * XXX doesn't belong here, move to node_age
 1970                  */
 1971                 if (ni->ni_rxfrag[0] != NULL &&
 1972                     ticks > ni->ni_rxfragstamp + hz) {
 1973                         m_freem(ni->ni_rxfrag[0]);
 1974                         ni->ni_rxfrag[0] = NULL;
 1975                 }
 1976                 if (ni->ni_inact > 0) {
 1977                         ni->ni_inact--;
 1978                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 1979                             "%s: inact %u inact_reload %u nrates %u",
 1980                             __func__, ni->ni_inact, ni->ni_inact_reload,
 1981                             ni->ni_rates.rs_nrates);
 1982                 }
 1983                 /*
 1984                  * Special case ourself; we may be idle for extended periods
 1985                  * of time and regardless reclaiming our state is wrong.
 1986                  * XXX run ic_node_age
 1987                  */
 1988                 if (ni == vap->iv_bss)
 1989                         continue;
 1990                 if (ni->ni_associd != 0 || 
 1991                     (vap->iv_opmode == IEEE80211_M_IBSS ||
 1992                      vap->iv_opmode == IEEE80211_M_AHDEMO)) {
 1993                         /*
 1994                          * Age/drain resources held by the station.
 1995                          */
 1996                         ic->ic_node_age(ni);
 1997                         /*
 1998                          * Probe the station before time it out.  We
 1999                          * send a null data frame which may not be
 2000                          * universally supported by drivers (need it
 2001                          * for ps-poll support so it should be...).
 2002                          *
 2003                          * XXX don't probe the station unless we've
 2004                          *     received a frame from them (and have
 2005                          *     some idea of the rates they are capable
 2006                          *     of); this will get fixed more properly
 2007                          *     soon with better handling of the rate set.
 2008                          */
 2009                         if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
 2010                             (0 < ni->ni_inact &&
 2011                              ni->ni_inact <= vap->iv_inact_probe) &&
 2012                             ni->ni_rates.rs_nrates != 0) {
 2013                                 IEEE80211_NOTE(vap,
 2014                                     IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
 2015                                     ni, "%s",
 2016                                     "probe station due to inactivity");
 2017                                 /*
 2018                                  * Grab a reference before unlocking the table
 2019                                  * so the node cannot be reclaimed before we
 2020                                  * send the frame. ieee80211_send_nulldata
 2021                                  * understands we've done this and reclaims the
 2022                                  * ref for us as needed.
 2023                                  */
 2024                                 ieee80211_ref_node(ni);
 2025                                 IEEE80211_NODE_UNLOCK(nt);
 2026                                 ieee80211_send_nulldata(ni);
 2027                                 /* XXX stat? */
 2028                                 goto restart;
 2029                         }
 2030                 }
 2031                 if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
 2032                     ni->ni_inact <= 0) {
 2033                         IEEE80211_NOTE(vap,
 2034                             IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
 2035                             "station timed out due to inactivity "
 2036                             "(refcnt %u)", ieee80211_node_refcnt(ni));
 2037                         /*
 2038                          * Send a deauthenticate frame and drop the station.
 2039                          * This is somewhat complicated due to reference counts
 2040                          * and locking.  At this point a station will typically
 2041                          * have a reference count of 1.  ieee80211_node_leave
 2042                          * will do a "free" of the node which will drop the
 2043                          * reference count.  But in the meantime a reference
 2044                          * wil be held by the deauth frame.  The actual reclaim
 2045                          * of the node will happen either after the tx is
 2046                          * completed or by ieee80211_node_leave.
 2047                          *
 2048                          * Separately we must drop the node lock before sending
 2049                          * in case the driver takes a lock, as this can result
 2050                          * in a LOR between the node lock and the driver lock.
 2051                          */
 2052                         ieee80211_ref_node(ni);
 2053                         IEEE80211_NODE_UNLOCK(nt);
 2054                         if (ni->ni_associd != 0) {
 2055                                 IEEE80211_SEND_MGMT(ni,
 2056                                     IEEE80211_FC0_SUBTYPE_DEAUTH,
 2057                                     IEEE80211_REASON_AUTH_EXPIRE);
 2058                         }
 2059                         ieee80211_node_leave(ni);
 2060                         ieee80211_free_node(ni);
 2061                         vap->iv_stats.is_node_timeout++;
 2062                         goto restart;
 2063                 }
 2064         }
 2065         IEEE80211_NODE_UNLOCK(nt);
 2066 
 2067         IEEE80211_NODE_ITERATE_UNLOCK(nt);
 2068 }
 2069 
 2070 /*
 2071  * Aggressively reclaim resources.  This should be used
 2072  * only in a critical situation to reclaim mbuf resources.
 2073  */
 2074 void
 2075 ieee80211_drain(struct ieee80211com *ic)
 2076 {
 2077         struct ieee80211_node_table *nt = &ic->ic_sta;
 2078         struct ieee80211vap *vap;
 2079         struct ieee80211_node *ni;
 2080 
 2081         IEEE80211_NODE_LOCK(nt);
 2082         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 2083                 /*
 2084                  * Ignore entries for which have yet to receive an
 2085                  * authentication frame.  These are transient and
 2086                  * will be reclaimed when the last reference to them
 2087                  * goes away (when frame xmits complete).
 2088                  */
 2089                 vap = ni->ni_vap;
 2090                 /*
 2091                  * Only process stations when in RUN state.  This
 2092                  * insures, for example, that we don't timeout an
 2093                  * inactive station during CAC.  Note that CSA state
 2094                  * is actually handled in ieee80211_node_timeout as
 2095                  * it applies to more than timeout processing.
 2096                  */
 2097                 if (vap->iv_state != IEEE80211_S_RUN)
 2098                         continue;
 2099                 /* XXX can vap be NULL? */
 2100                 if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
 2101                      vap->iv_opmode == IEEE80211_M_STA) &&
 2102                     (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 2103                         continue;
 2104                 /*
 2105                  * Free fragments.
 2106                  * XXX doesn't belong here, move to node_drain
 2107                  */
 2108                 if (ni->ni_rxfrag[0] != NULL) {
 2109                         m_freem(ni->ni_rxfrag[0]);
 2110                         ni->ni_rxfrag[0] = NULL;
 2111                 }
 2112                 /*
 2113                  * Drain resources held by the station.
 2114                  */
 2115                 ic->ic_node_drain(ni);
 2116         }
 2117         IEEE80211_NODE_UNLOCK(nt);
 2118 }
 2119 
 2120 /*
 2121  * Per-ieee80211com inactivity timer callback.
 2122  */
 2123 void
 2124 ieee80211_node_timeout(void *arg)
 2125 {
 2126         struct ieee80211com *ic = arg;
 2127 
 2128         /*
 2129          * Defer timeout processing if a channel switch is pending.
 2130          * We typically need to be mute so not doing things that
 2131          * might generate frames is good to handle in one place.
 2132          * Supressing the station timeout processing may extend the
 2133          * lifetime of inactive stations (by not decrementing their
 2134          * idle counters) but this should be ok unless the CSA is
 2135          * active for an unusually long time.
 2136          */
 2137         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
 2138                 ieee80211_scan_timeout(ic);
 2139                 ieee80211_timeout_stations(ic);
 2140                 ieee80211_ageq_age(&ic->ic_stageq, IEEE80211_INACT_WAIT);
 2141 
 2142                 IEEE80211_LOCK(ic);
 2143                 ieee80211_erp_timeout(ic);
 2144                 ieee80211_ht_timeout(ic);
 2145                 IEEE80211_UNLOCK(ic);
 2146         }
 2147         callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
 2148                 ieee80211_node_timeout, ic);
 2149 }
 2150 
 2151 void
 2152 ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
 2153         ieee80211_iter_func *f, void *arg)
 2154 {
 2155         struct ieee80211_node *ni;
 2156         u_int gen;
 2157 
 2158         IEEE80211_NODE_ITERATE_LOCK(nt);
 2159         gen = ++nt->nt_scangen;
 2160 restart:
 2161         IEEE80211_NODE_LOCK(nt);
 2162         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 2163                 if (ni->ni_scangen != gen) {
 2164                         ni->ni_scangen = gen;
 2165                         (void) ieee80211_ref_node(ni);
 2166                         IEEE80211_NODE_UNLOCK(nt);
 2167                         (*f)(arg, ni);
 2168                         ieee80211_free_node(ni);
 2169                         goto restart;
 2170                 }
 2171         }
 2172         IEEE80211_NODE_UNLOCK(nt);
 2173 
 2174         IEEE80211_NODE_ITERATE_UNLOCK(nt);
 2175 }
 2176 
 2177 void
 2178 ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 2179 {
 2180         printf("0x%p: mac %s refcnt %d\n", ni,
 2181                 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
 2182         printf("\tscangen %u authmode %u flags 0x%x\n",
 2183                 ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
 2184         printf("\tassocid 0x%x txpower %u vlan %u\n",
 2185                 ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
 2186         printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
 2187                 ni->ni_txseqs[IEEE80211_NONQOS_TID],
 2188                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT,
 2189                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK,
 2190                 ni->ni_rxfragstamp);
 2191         printf("\trssi %d noise %d intval %u capinfo 0x%x\n",
 2192                 node_getrssi(ni), ni->ni_noise,
 2193                 ni->ni_intval, ni->ni_capinfo);
 2194         printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
 2195                 ether_sprintf(ni->ni_bssid),
 2196                 ni->ni_esslen, ni->ni_essid,
 2197                 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
 2198         printf("\tinact %u inact_reload %u txrate %u\n",
 2199                 ni->ni_inact, ni->ni_inact_reload, ni->ni_txrate);
 2200         printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n",
 2201                 ni->ni_htcap, ni->ni_htparam,
 2202                 ni->ni_htctlchan, ni->ni_ht2ndchan);
 2203         printf("\thtopmode %x htstbc %x chw %u\n",
 2204                 ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw);
 2205 }
 2206 
 2207 void
 2208 ieee80211_dump_nodes(struct ieee80211_node_table *nt)
 2209 {
 2210         ieee80211_iterate_nodes(nt,
 2211                 (ieee80211_iter_func *) ieee80211_dump_node, nt);
 2212 }
 2213 
 2214 static void
 2215 ieee80211_notify_erp_locked(struct ieee80211com *ic)
 2216 {
 2217         struct ieee80211vap *vap;
 2218 
 2219         IEEE80211_LOCK_ASSERT(ic);
 2220 
 2221         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 2222                 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
 2223                         ieee80211_beacon_notify(vap, IEEE80211_BEACON_ERP);
 2224 }
 2225 
 2226 void
 2227 ieee80211_notify_erp(struct ieee80211com *ic)
 2228 {
 2229         IEEE80211_LOCK(ic);
 2230         ieee80211_notify_erp_locked(ic);
 2231         IEEE80211_UNLOCK(ic);
 2232 }
 2233 
 2234 /*
 2235  * Handle a station joining an 11g network.
 2236  */
 2237 static void
 2238 ieee80211_node_join_11g(struct ieee80211_node *ni)
 2239 {
 2240         struct ieee80211com *ic = ni->ni_ic;
 2241 
 2242         IEEE80211_LOCK_ASSERT(ic);
 2243 
 2244         /*
 2245          * Station isn't capable of short slot time.  Bump
 2246          * the count of long slot time stations and disable
 2247          * use of short slot time.  Note that the actual switch
 2248          * over to long slot time use may not occur until the
 2249          * next beacon transmission (per sec. 7.3.1.4 of 11g).
 2250          */
 2251         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 2252                 ic->ic_longslotsta++;
 2253                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2254                     "station needs long slot time, count %d",
 2255                     ic->ic_longslotsta);
 2256                 /* XXX vap's w/ conflicting needs won't work */
 2257                 if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
 2258                         /*
 2259                          * Don't force slot time when switched to turbo
 2260                          * mode as non-ERP stations won't be present; this
 2261                          * need only be done when on the normal G channel.
 2262                          */
 2263                         ieee80211_set_shortslottime(ic, 0);
 2264                 }
 2265         }
 2266         /*
 2267          * If the new station is not an ERP station
 2268          * then bump the counter and enable protection
 2269          * if configured.
 2270          */
 2271         if (!ieee80211_iserp_rateset(&ni->ni_rates)) {
 2272                 ic->ic_nonerpsta++;
 2273                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2274                     "station is !ERP, %d non-ERP stations associated",
 2275                     ic->ic_nonerpsta);
 2276                 /*
 2277                  * If station does not support short preamble
 2278                  * then we must enable use of Barker preamble.
 2279                  */
 2280                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
 2281                         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2282                             "%s", "station needs long preamble");
 2283                         ic->ic_flags |= IEEE80211_F_USEBARKER;
 2284                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
 2285                 }
 2286                 /*
 2287                  * If protection is configured and this is the first
 2288                  * indication we should use protection, enable it.
 2289                  */
 2290                 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
 2291                     ic->ic_nonerpsta == 1 &&
 2292                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 2293                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
 2294                             "%s: enable use of protection\n", __func__);
 2295                         ic->ic_flags |= IEEE80211_F_USEPROT;
 2296                         ieee80211_notify_erp_locked(ic);
 2297                 }
 2298         } else
 2299                 ni->ni_flags |= IEEE80211_NODE_ERP;
 2300 }
 2301 
 2302 void
 2303 ieee80211_node_join(struct ieee80211_node *ni, int resp)
 2304 {
 2305         struct ieee80211com *ic = ni->ni_ic;
 2306         struct ieee80211vap *vap = ni->ni_vap;
 2307         int newassoc;
 2308 
 2309         if (ni->ni_associd == 0) {
 2310                 uint16_t aid;
 2311 
 2312                 KASSERT(vap->iv_aid_bitmap != NULL, ("no aid bitmap"));
 2313                 /*
 2314                  * It would be good to search the bitmap
 2315                  * more efficiently, but this will do for now.
 2316                  */
 2317                 for (aid = 1; aid < vap->iv_max_aid; aid++) {
 2318                         if (!IEEE80211_AID_ISSET(vap, aid))
 2319                                 break;
 2320                 }
 2321                 if (aid >= vap->iv_max_aid) {
 2322                         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_TOOMANY);
 2323                         ieee80211_node_leave(ni);
 2324                         return;
 2325                 }
 2326                 ni->ni_associd = aid | 0xc000;
 2327                 ni->ni_jointime = time_uptime;
 2328                 IEEE80211_LOCK(ic);
 2329                 IEEE80211_AID_SET(vap, ni->ni_associd);
 2330                 vap->iv_sta_assoc++;
 2331                 ic->ic_sta_assoc++;
 2332 
 2333                 if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 2334                         ieee80211_ht_node_join(ni);
 2335                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2336                     IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 2337                         ieee80211_node_join_11g(ni);
 2338                 IEEE80211_UNLOCK(ic);
 2339 
 2340                 newassoc = 1;
 2341         } else
 2342                 newassoc = 0;
 2343 
 2344         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 2345             "station associated at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
 2346             IEEE80211_NODE_AID(ni),
 2347             ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
 2348             ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
 2349             ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
 2350             ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
 2351             ni->ni_flags & IEEE80211_NODE_HT ?
 2352                 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
 2353             ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
 2354             ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
 2355                 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
 2356             ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
 2357             IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
 2358                 ", fast-frames" : "",
 2359             IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
 2360                 ", turbo" : ""
 2361         );
 2362 
 2363         ieee80211_node_setuptxparms(ni);
 2364         ieee80211_ratectl_node_init(ni);
 2365         /* give driver a chance to setup state like ni_txrate */
 2366         if (ic->ic_newassoc != NULL)
 2367                 ic->ic_newassoc(ni, newassoc);
 2368         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_SUCCESS);
 2369         /* tell the authenticator about new station */
 2370         if (vap->iv_auth->ia_node_join != NULL)
 2371                 vap->iv_auth->ia_node_join(ni);
 2372         ieee80211_notify_node_join(ni,
 2373             resp == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 2374 }
 2375 
 2376 static void
 2377 disable_protection(struct ieee80211com *ic)
 2378 {
 2379         KASSERT(ic->ic_nonerpsta == 0 &&
 2380             (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0,
 2381            ("%d non ERP stations, flags 0x%x", ic->ic_nonerpsta,
 2382            ic->ic_flags_ext));
 2383 
 2384         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 2385         /* XXX verify mode? */
 2386         if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
 2387                 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
 2388                 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
 2389         }
 2390         ieee80211_notify_erp_locked(ic);
 2391 }
 2392 
 2393 /*
 2394  * Handle a station leaving an 11g network.
 2395  */
 2396 static void
 2397 ieee80211_node_leave_11g(struct ieee80211_node *ni)
 2398 {
 2399         struct ieee80211com *ic = ni->ni_ic;
 2400 
 2401         IEEE80211_LOCK_ASSERT(ic);
 2402 
 2403         KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
 2404              ("not in 11g, bss %u:0x%x", ic->ic_bsschan->ic_freq,
 2405               ic->ic_bsschan->ic_flags));
 2406 
 2407         /*
 2408          * If a long slot station do the slot time bookkeeping.
 2409          */
 2410         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 2411                 KASSERT(ic->ic_longslotsta > 0,
 2412                     ("bogus long slot station count %d", ic->ic_longslotsta));
 2413                 ic->ic_longslotsta--;
 2414                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2415                     "long slot time station leaves, count now %d",
 2416                     ic->ic_longslotsta);
 2417                 if (ic->ic_longslotsta == 0) {
 2418                         /*
 2419                          * Re-enable use of short slot time if supported
 2420                          * and not operating in IBSS mode (per spec).
 2421                          */
 2422                         if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
 2423                             ic->ic_opmode != IEEE80211_M_IBSS) {
 2424                                 IEEE80211_DPRINTF(ni->ni_vap,
 2425                                     IEEE80211_MSG_ASSOC,
 2426                                     "%s: re-enable use of short slot time\n",
 2427                                     __func__);
 2428                                 ieee80211_set_shortslottime(ic, 1);
 2429                         }
 2430                 }
 2431         }
 2432         /*
 2433          * If a non-ERP station do the protection-related bookkeeping.
 2434          */
 2435         if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
 2436                 KASSERT(ic->ic_nonerpsta > 0,
 2437                     ("bogus non-ERP station count %d", ic->ic_nonerpsta));
 2438                 ic->ic_nonerpsta--;
 2439                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2440                     "non-ERP station leaves, count now %d%s", ic->ic_nonerpsta,
 2441                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) ?
 2442                         " (non-ERP sta present)" : "");
 2443                 if (ic->ic_nonerpsta == 0 &&
 2444                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 2445                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
 2446                                 "%s: disable use of protection\n", __func__);
 2447                         disable_protection(ic);
 2448                 }
 2449         }
 2450 }
 2451 
 2452 /*
 2453  * Time out presence of an overlapping bss with non-ERP
 2454  * stations.  When operating in hostap mode we listen for
 2455  * beacons from other stations and if we identify a non-ERP
 2456  * station is present we enable protection.  To identify
 2457  * when all non-ERP stations are gone we time out this
 2458  * condition.
 2459  */
 2460 static void
 2461 ieee80211_erp_timeout(struct ieee80211com *ic)
 2462 {
 2463 
 2464         IEEE80211_LOCK_ASSERT(ic);
 2465 
 2466         if ((ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) &&
 2467             time_after(ticks, ic->ic_lastnonerp + IEEE80211_NONERP_PRESENT_AGE)) {
 2468 #if 0
 2469                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 2470                     "%s", "age out non-ERP sta present on channel");
 2471 #endif
 2472                 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 2473                 if (ic->ic_nonerpsta == 0)
 2474                         disable_protection(ic);
 2475         }
 2476 }
 2477 
 2478 /*
 2479  * Handle bookkeeping for station deauthentication/disassociation
 2480  * when operating as an ap.
 2481  */
 2482 void
 2483 ieee80211_node_leave(struct ieee80211_node *ni)
 2484 {
 2485         struct ieee80211com *ic = ni->ni_ic;
 2486         struct ieee80211vap *vap = ni->ni_vap;
 2487         struct ieee80211_node_table *nt = ni->ni_table;
 2488 
 2489         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 2490             "station with aid %d leaves", IEEE80211_NODE_AID(ni));
 2491 
 2492         KASSERT(vap->iv_opmode != IEEE80211_M_STA,
 2493                 ("unexpected operating mode %u", vap->iv_opmode));
 2494         /*
 2495          * If node wasn't previously associated all
 2496          * we need to do is reclaim the reference.
 2497          */
 2498         /* XXX ibss mode bypasses 11g and notification */
 2499         if (ni->ni_associd == 0)
 2500                 goto done;
 2501         /*
 2502          * Tell the authenticator the station is leaving.
 2503          * Note that we must do this before yanking the
 2504          * association id as the authenticator uses the
 2505          * associd to locate it's state block.
 2506          */
 2507         if (vap->iv_auth->ia_node_leave != NULL)
 2508                 vap->iv_auth->ia_node_leave(ni);
 2509 
 2510         IEEE80211_LOCK(ic);
 2511         IEEE80211_AID_CLR(vap, ni->ni_associd);
 2512         ni->ni_associd = 0;
 2513         vap->iv_sta_assoc--;
 2514         ic->ic_sta_assoc--;
 2515 
 2516         if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 2517                 ieee80211_ht_node_leave(ni);
 2518         if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2519             IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 2520                 ieee80211_node_leave_11g(ni);
 2521         IEEE80211_UNLOCK(ic);
 2522         /*
 2523          * Cleanup station state.  In particular clear various
 2524          * state that might otherwise be reused if the node
 2525          * is reused before the reference count goes to zero
 2526          * (and memory is reclaimed).
 2527          */
 2528         ieee80211_sta_leave(ni);
 2529 done:
 2530         /*
 2531          * Remove the node from any table it's recorded in and
 2532          * drop the caller's reference.  Removal from the table
 2533          * is important to insure the node is not reprocessed
 2534          * for inactivity.
 2535          */
 2536         if (nt != NULL) {
 2537                 IEEE80211_NODE_LOCK(nt);
 2538                 node_reclaim(nt, ni);
 2539                 IEEE80211_NODE_UNLOCK(nt);
 2540         } else
 2541                 ieee80211_free_node(ni);
 2542 }
 2543 
 2544 struct rssiinfo {
 2545         struct ieee80211vap *vap;
 2546         int     rssi_samples;
 2547         uint32_t rssi_total;
 2548 };
 2549 
 2550 static void
 2551 get_hostap_rssi(void *arg, struct ieee80211_node *ni)
 2552 {
 2553         struct rssiinfo *info = arg;
 2554         struct ieee80211vap *vap = ni->ni_vap;
 2555         int8_t rssi;
 2556 
 2557         if (info->vap != vap)
 2558                 return;
 2559         /* only associated stations */
 2560         if (ni->ni_associd == 0)
 2561                 return;
 2562         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2563         if (rssi != 0) {
 2564                 info->rssi_samples++;
 2565                 info->rssi_total += rssi;
 2566         }
 2567 }
 2568 
 2569 static void
 2570 get_adhoc_rssi(void *arg, struct ieee80211_node *ni)
 2571 {
 2572         struct rssiinfo *info = arg;
 2573         struct ieee80211vap *vap = ni->ni_vap;
 2574         int8_t rssi;
 2575 
 2576         if (info->vap != vap)
 2577                 return;
 2578         /* only neighbors */
 2579         /* XXX check bssid */
 2580         if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
 2581                 return;
 2582         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2583         if (rssi != 0) {
 2584                 info->rssi_samples++;
 2585                 info->rssi_total += rssi;
 2586         }
 2587 }
 2588 
 2589 #ifdef IEEE80211_SUPPORT_MESH
 2590 static void
 2591 get_mesh_rssi(void *arg, struct ieee80211_node *ni)
 2592 {
 2593         struct rssiinfo *info = arg;
 2594         struct ieee80211vap *vap = ni->ni_vap;
 2595         int8_t rssi;
 2596 
 2597         if (info->vap != vap)
 2598                 return;
 2599         /* only neighbors that peered successfully */
 2600         if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
 2601                 return;
 2602         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2603         if (rssi != 0) {
 2604                 info->rssi_samples++;
 2605                 info->rssi_total += rssi;
 2606         }
 2607 }
 2608 #endif /* IEEE80211_SUPPORT_MESH */
 2609 
 2610 int8_t
 2611 ieee80211_getrssi(struct ieee80211vap *vap)
 2612 {
 2613 #define NZ(x)   ((x) == 0 ? 1 : (x))
 2614         struct ieee80211com *ic = vap->iv_ic;
 2615         struct rssiinfo info;
 2616 
 2617         info.rssi_total = 0;
 2618         info.rssi_samples = 0;
 2619         info.vap = vap;
 2620         switch (vap->iv_opmode) {
 2621         case IEEE80211_M_IBSS:          /* average of all ibss neighbors */
 2622         case IEEE80211_M_AHDEMO:        /* average of all neighbors */
 2623                 ieee80211_iterate_nodes(&ic->ic_sta, get_adhoc_rssi, &info);
 2624                 break;
 2625         case IEEE80211_M_HOSTAP:        /* average of all associated stations */
 2626                 ieee80211_iterate_nodes(&ic->ic_sta, get_hostap_rssi, &info);
 2627                 break;
 2628 #ifdef IEEE80211_SUPPORT_MESH
 2629         case IEEE80211_M_MBSS:          /* average of all mesh neighbors */
 2630                 ieee80211_iterate_nodes(&ic->ic_sta, get_mesh_rssi, &info);
 2631                 break;
 2632 #endif
 2633         case IEEE80211_M_MONITOR:       /* XXX */
 2634         case IEEE80211_M_STA:           /* use stats from associated ap */
 2635         default:
 2636                 if (vap->iv_bss != NULL)
 2637                         info.rssi_total = ic->ic_node_getrssi(vap->iv_bss);
 2638                 info.rssi_samples = 1;
 2639                 break;
 2640         }
 2641         return info.rssi_total / NZ(info.rssi_samples);
 2642 #undef NZ
 2643 }
 2644 
 2645 void
 2646 ieee80211_getsignal(struct ieee80211vap *vap, int8_t *rssi, int8_t *noise)
 2647 {
 2648 
 2649         if (vap->iv_bss == NULL)                /* NB: shouldn't happen */
 2650                 return;
 2651         vap->iv_ic->ic_node_getsignal(vap->iv_bss, rssi, noise);
 2652         /* for non-station mode return avg'd rssi accounting */
 2653         if (vap->iv_opmode != IEEE80211_M_STA)
 2654                 *rssi = ieee80211_getrssi(vap);
 2655 }

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