The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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: releng/10.2/sys/net80211/ieee80211_node.c 254315 2013-08-14 04:24:25Z rpaulo $");
   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 void
  689 ieee80211_update_chw(struct ieee80211com *ic)
  690 {
  691 
  692         ieee80211_setupcurchan(ic, ic->ic_curchan);
  693         ieee80211_runtask(ic, &ic->ic_chw_task);
  694 }
  695 
  696 /*
  697  * Join the specified IBSS/BSS network.  The node is assumed to
  698  * be passed in with a held reference.
  699  */
  700 static int
  701 ieee80211_sta_join1(struct ieee80211_node *selbs)
  702 {
  703         struct ieee80211vap *vap = selbs->ni_vap;
  704         struct ieee80211com *ic = selbs->ni_ic;
  705         struct ieee80211_node *obss;
  706         int canreassoc;
  707 
  708         /*
  709          * Committed to selbs, setup state.
  710          */
  711         obss = vap->iv_bss;
  712         /*
  713          * Check if old+new node have the same address in which
  714          * case we can reassociate when operating in sta mode.
  715          */
  716         canreassoc = (obss != NULL &&
  717                 vap->iv_state == IEEE80211_S_RUN &&
  718                 IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr));
  719         vap->iv_bss = selbs;            /* NB: caller assumed to bump refcnt */
  720         if (obss != NULL) {
  721                 copy_bss(selbs, obss);
  722                 ieee80211_node_decref(obss);    /* iv_bss reference */
  723                 ieee80211_free_node(obss);      /* station table reference */
  724                 obss = NULL;            /* NB: guard against later use */
  725         }
  726 
  727         /*
  728          * Delete unusable rates; we've already checked
  729          * that the negotiated rate set is acceptable.
  730          */
  731         ieee80211_fix_rate(vap->iv_bss, &vap->iv_bss->ni_rates,
  732                 IEEE80211_F_DODEL | IEEE80211_F_JOIN);
  733 
  734         ieee80211_setcurchan(ic, selbs->ni_chan);
  735         /*
  736          * Set the erp state (mostly the slot time) to deal with
  737          * the auto-select case; this should be redundant if the
  738          * mode is locked.
  739          */ 
  740         ieee80211_reset_erp(ic);
  741         ieee80211_wme_initparams(vap);
  742 
  743         if (vap->iv_opmode == IEEE80211_M_STA) {
  744                 if (canreassoc) {
  745                         /* Reassociate */
  746                         ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
  747                 } else {
  748                         /*
  749                          * Act as if we received a DEAUTH frame in case we
  750                          * are invoked from the RUN state.  This will cause
  751                          * us to try to re-authenticate if we are operating
  752                          * as a station.
  753                          */
  754                         ieee80211_new_state(vap, IEEE80211_S_AUTH,
  755                                 IEEE80211_FC0_SUBTYPE_DEAUTH);
  756                 }
  757         } else
  758                 ieee80211_new_state(vap, IEEE80211_S_RUN, -1);
  759         return 1;
  760 }
  761 
  762 int
  763 ieee80211_sta_join(struct ieee80211vap *vap, struct ieee80211_channel *chan,
  764         const struct ieee80211_scan_entry *se)
  765 {
  766         struct ieee80211com *ic = vap->iv_ic;
  767         struct ieee80211_node *ni;
  768 
  769         ni = ieee80211_alloc_node(&ic->ic_sta, vap, se->se_macaddr);
  770         if (ni == NULL) {
  771                 /* XXX msg */
  772                 return 0;
  773         }
  774 
  775         /*
  776          * Expand scan state into node's format.
  777          * XXX may not need all this stuff
  778          */
  779         IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
  780         ni->ni_esslen = se->se_ssid[1];
  781         memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen);
  782         ni->ni_tstamp.tsf = se->se_tstamp.tsf;
  783         ni->ni_intval = se->se_intval;
  784         ni->ni_capinfo = se->se_capinfo;
  785         ni->ni_chan = chan;
  786         ni->ni_timoff = se->se_timoff;
  787         ni->ni_fhdwell = se->se_fhdwell;
  788         ni->ni_fhindex = se->se_fhindex;
  789         ni->ni_erp = se->se_erp;
  790         IEEE80211_RSSI_LPF(ni->ni_avgrssi, se->se_rssi);
  791         ni->ni_noise = se->se_noise;
  792         if (vap->iv_opmode == IEEE80211_M_STA) {
  793                 /* NB: only infrastructure mode requires an associd */
  794                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
  795         }
  796 
  797         if (ieee80211_ies_init(&ni->ni_ies, se->se_ies.data, se->se_ies.len)) {
  798                 ieee80211_ies_expand(&ni->ni_ies);
  799 #ifdef IEEE80211_SUPPORT_SUPERG
  800                 if (ni->ni_ies.ath_ie != NULL)
  801                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
  802 #endif
  803                 if (ni->ni_ies.htcap_ie != NULL)
  804                         ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
  805                 if (ni->ni_ies.htinfo_ie != NULL)
  806                         ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
  807 #ifdef IEEE80211_SUPPORT_MESH
  808                 if (ni->ni_ies.meshid_ie != NULL)
  809                         ieee80211_parse_meshid(ni, ni->ni_ies.meshid_ie);
  810 #endif
  811 #ifdef IEEE80211_SUPPORT_TDMA
  812                 if (ni->ni_ies.tdma_ie != NULL)
  813                         ieee80211_parse_tdma(ni, ni->ni_ies.tdma_ie);
  814 #endif
  815         }
  816 
  817         vap->iv_dtim_period = se->se_dtimperiod;
  818         vap->iv_dtim_count = 0;
  819 
  820         /* NB: must be after ni_chan is setup */
  821         ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
  822                 IEEE80211_F_DOSORT);
  823         if (ieee80211_iserp_rateset(&ni->ni_rates))
  824                 ni->ni_flags |= IEEE80211_NODE_ERP;
  825 
  826         /*
  827          * Setup HT state for this node if it's available, otherwise
  828          * non-STA modes won't pick this state up.
  829          *
  830          * For IBSS and related modes that don't go through an
  831          * association request/response, the only appropriate place
  832          * to setup the HT state is here.
  833          */
  834         if (ni->ni_ies.htinfo_ie != NULL &&
  835             ni->ni_ies.htcap_ie != NULL &&
  836             vap->iv_flags_ht & IEEE80211_FHT_HT) {
  837                 ieee80211_ht_node_init(ni);
  838                 ieee80211_ht_updateparams(ni,
  839                     ni->ni_ies.htcap_ie,
  840                     ni->ni_ies.htinfo_ie);
  841                 ieee80211_setup_htrates(ni, ni->ni_ies.htcap_ie,
  842                     IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
  843                 ieee80211_setup_basic_htrates(ni, ni->ni_ies.htinfo_ie);
  844         }
  845         /* XXX else check for ath FF? */
  846         /* XXX QoS? Difficult given that WME config is specific to a master */
  847 
  848         ieee80211_node_setuptxparms(ni);
  849         ieee80211_ratectl_node_init(ni);
  850 
  851         return ieee80211_sta_join1(ieee80211_ref_node(ni));
  852 }
  853 
  854 /*
  855  * Leave the specified IBSS/BSS network.  The node is assumed to
  856  * be passed in with a held reference.
  857  */
  858 void
  859 ieee80211_sta_leave(struct ieee80211_node *ni)
  860 {
  861         struct ieee80211com *ic = ni->ni_ic;
  862 
  863         ic->ic_node_cleanup(ni);
  864         ieee80211_notify_node_leave(ni);
  865 }
  866 
  867 /*
  868  * Send a deauthenticate frame and drop the station.
  869  */
  870 void
  871 ieee80211_node_deauth(struct ieee80211_node *ni, int reason)
  872 {
  873         /* NB: bump the refcnt to be sure temporay nodes are not reclaimed */
  874         ieee80211_ref_node(ni);
  875         if (ni->ni_associd != 0)
  876                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
  877         ieee80211_node_leave(ni);
  878         ieee80211_free_node(ni);
  879 }
  880 
  881 static struct ieee80211_node *
  882 node_alloc(struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
  883 {
  884         struct ieee80211_node *ni;
  885 
  886         ni = (struct ieee80211_node *) malloc(sizeof(struct ieee80211_node),
  887                 M_80211_NODE, M_NOWAIT | M_ZERO);
  888         return ni;
  889 }
  890 
  891 /*
  892  * Initialize an ie blob with the specified data.  If previous
  893  * data exists re-use the data block.  As a side effect we clear
  894  * all references to specific ie's; the caller is required to
  895  * recalculate them.
  896  */
  897 int
  898 ieee80211_ies_init(struct ieee80211_ies *ies, const uint8_t *data, int len)
  899 {
  900         /* NB: assumes data+len are the last fields */
  901         memset(ies, 0, offsetof(struct ieee80211_ies, data));
  902         if (ies->data != NULL && ies->len != len) {
  903                 /* data size changed */
  904                 free(ies->data, M_80211_NODE_IE);
  905                 ies->data = NULL;
  906         }
  907         if (ies->data == NULL) {
  908                 ies->data = (uint8_t *) malloc(len, M_80211_NODE_IE, M_NOWAIT);
  909                 if (ies->data == NULL) {
  910                         ies->len = 0;
  911                         /* NB: pointers have already been zero'd above */
  912                         return 0;
  913                 }
  914         }
  915         memcpy(ies->data, data, len);
  916         ies->len = len;
  917         return 1;
  918 }
  919 
  920 /*
  921  * Reclaim storage for an ie blob.
  922  */
  923 void
  924 ieee80211_ies_cleanup(struct ieee80211_ies *ies)
  925 {
  926         if (ies->data != NULL)
  927                 free(ies->data, M_80211_NODE_IE);
  928 }
  929 
  930 /*
  931  * Expand an ie blob data contents and to fillin individual
  932  * ie pointers.  The data blob is assumed to be well-formed;
  933  * we don't do any validity checking of ie lengths.
  934  */
  935 void
  936 ieee80211_ies_expand(struct ieee80211_ies *ies)
  937 {
  938         uint8_t *ie;
  939         int ielen;
  940 
  941         ie = ies->data;
  942         ielen = ies->len;
  943         while (ielen > 0) {
  944                 switch (ie[0]) {
  945                 case IEEE80211_ELEMID_VENDOR:
  946                         if (iswpaoui(ie))
  947                                 ies->wpa_ie = ie;
  948                         else if (iswmeoui(ie))
  949                                 ies->wme_ie = ie;
  950 #ifdef IEEE80211_SUPPORT_SUPERG
  951                         else if (isatherosoui(ie))
  952                                 ies->ath_ie = ie;
  953 #endif
  954 #ifdef IEEE80211_SUPPORT_TDMA
  955                         else if (istdmaoui(ie))
  956                                 ies->tdma_ie = ie;
  957 #endif
  958                         break;
  959                 case IEEE80211_ELEMID_RSN:
  960                         ies->rsn_ie = ie;
  961                         break;
  962                 case IEEE80211_ELEMID_HTCAP:
  963                         ies->htcap_ie = ie;
  964                         break;
  965                 case IEEE80211_ELEMID_HTINFO:
  966                         ies->htinfo_ie = ie;
  967                         break;
  968 #ifdef IEEE80211_SUPPORT_MESH
  969                 case IEEE80211_ELEMID_MESHID:
  970                         ies->meshid_ie = ie;
  971                         break;
  972 #endif
  973                 }
  974                 ielen -= 2 + ie[1];
  975                 ie += 2 + ie[1];
  976         }
  977 }
  978 
  979 /*
  980  * Reclaim any resources in a node and reset any critical
  981  * state.  Typically nodes are free'd immediately after,
  982  * but in some cases the storage may be reused so we need
  983  * to insure consistent state (should probably fix that).
  984  */
  985 static void
  986 node_cleanup(struct ieee80211_node *ni)
  987 {
  988         struct ieee80211vap *vap = ni->ni_vap;
  989         struct ieee80211com *ic = ni->ni_ic;
  990         int i;
  991 
  992         /* NB: preserve ni_table */
  993         if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
  994                 if (vap->iv_opmode != IEEE80211_M_STA)
  995                         vap->iv_ps_sta--;
  996                 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  997                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
  998                     "power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
  999         }
 1000         /*
 1001          * Cleanup any HT-related state.
 1002          */
 1003         if (ni->ni_flags & IEEE80211_NODE_HT)
 1004                 ieee80211_ht_node_cleanup(ni);
 1005 #ifdef IEEE80211_SUPPORT_SUPERG
 1006         else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
 1007                 ieee80211_ff_node_cleanup(ni);
 1008 #endif
 1009 #ifdef IEEE80211_SUPPORT_MESH
 1010         /*
 1011          * Cleanup any mesh-related state.
 1012          */
 1013         if (vap->iv_opmode == IEEE80211_M_MBSS)
 1014                 ieee80211_mesh_node_cleanup(ni);
 1015 #endif
 1016         /*
 1017          * Clear any staging queue entries.
 1018          */
 1019         ieee80211_ageq_drain_node(&ic->ic_stageq, ni);
 1020 
 1021         /*
 1022          * Clear AREF flag that marks the authorization refcnt bump
 1023          * has happened.  This is probably not needed as the node
 1024          * should always be removed from the table so not found but
 1025          * do it just in case.
 1026          * Likewise clear the ASSOCID flag as these flags are intended
 1027          * to be managed in tandem.
 1028          */
 1029         ni->ni_flags &= ~(IEEE80211_NODE_AREF | IEEE80211_NODE_ASSOCID);
 1030 
 1031         /*
 1032          * Drain power save queue and, if needed, clear TIM.
 1033          */
 1034         if (ieee80211_node_psq_drain(ni) != 0 && vap->iv_set_tim != NULL)
 1035                 vap->iv_set_tim(ni, 0);
 1036 
 1037         ni->ni_associd = 0;
 1038         if (ni->ni_challenge != NULL) {
 1039                 free(ni->ni_challenge, M_80211_NODE);
 1040                 ni->ni_challenge = NULL;
 1041         }
 1042         /*
 1043          * Preserve SSID, WPA, and WME ie's so the bss node is
 1044          * reusable during a re-auth/re-assoc state transition.
 1045          * If we remove these data they will not be recreated
 1046          * because they come from a probe-response or beacon frame
 1047          * which cannot be expected prior to the association-response.
 1048          * This should not be an issue when operating in other modes
 1049          * as stations leaving always go through a full state transition
 1050          * which will rebuild this state.
 1051          *
 1052          * XXX does this leave us open to inheriting old state?
 1053          */
 1054         for (i = 0; i < nitems(ni->ni_rxfrag); i++)
 1055                 if (ni->ni_rxfrag[i] != NULL) {
 1056                         m_freem(ni->ni_rxfrag[i]);
 1057                         ni->ni_rxfrag[i] = NULL;
 1058                 }
 1059         /*
 1060          * Must be careful here to remove any key map entry w/o a LOR.
 1061          */
 1062         ieee80211_node_delucastkey(ni);
 1063 }
 1064 
 1065 static void
 1066 node_free(struct ieee80211_node *ni)
 1067 {
 1068         struct ieee80211com *ic = ni->ni_ic;
 1069 
 1070         ieee80211_ratectl_node_deinit(ni);
 1071         ic->ic_node_cleanup(ni);
 1072         ieee80211_ies_cleanup(&ni->ni_ies);
 1073         ieee80211_psq_cleanup(&ni->ni_psq);
 1074         free(ni, M_80211_NODE);
 1075 }
 1076 
 1077 static void
 1078 node_age(struct ieee80211_node *ni)
 1079 {
 1080         struct ieee80211vap *vap = ni->ni_vap;
 1081 
 1082         IEEE80211_NODE_LOCK_ASSERT(&vap->iv_ic->ic_sta);
 1083 
 1084         /*
 1085          * Age frames on the power save queue.
 1086          */
 1087         if (ieee80211_node_psq_age(ni) != 0 &&
 1088             ni->ni_psq.psq_len == 0 && vap->iv_set_tim != NULL)
 1089                 vap->iv_set_tim(ni, 0);
 1090         /*
 1091          * Age out HT resources (e.g. frames on the
 1092          * A-MPDU reorder queues).
 1093          */
 1094         if (ni->ni_associd != 0 && (ni->ni_flags & IEEE80211_NODE_HT))
 1095                 ieee80211_ht_node_age(ni);
 1096 }
 1097 
 1098 static int8_t
 1099 node_getrssi(const struct ieee80211_node *ni)
 1100 {
 1101         uint32_t avgrssi = ni->ni_avgrssi;
 1102         int32_t rssi;
 1103 
 1104         if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER)
 1105                 return 0;
 1106         rssi = IEEE80211_RSSI_GET(avgrssi);
 1107         return rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
 1108 }
 1109 
 1110 static void
 1111 node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise)
 1112 {
 1113         *rssi = node_getrssi(ni);
 1114         *noise = ni->ni_noise;
 1115 }
 1116 
 1117 static void
 1118 node_getmimoinfo(const struct ieee80211_node *ni,
 1119         struct ieee80211_mimo_info *info)
 1120 {
 1121         int i;
 1122         uint32_t avgrssi;
 1123         int32_t rssi;
 1124 
 1125         bzero(info, sizeof(*info));
 1126 
 1127         for (i = 0; i < ni->ni_mimo_chains; i++) {
 1128                 avgrssi = ni->ni_mimo_rssi_ctl[i];
 1129                 if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER) {
 1130                         info->rssi[i] = 0;
 1131                 } else {
 1132                         rssi = IEEE80211_RSSI_GET(avgrssi);
 1133                         info->rssi[i] = rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
 1134                 }
 1135                 info->noise[i] = ni->ni_mimo_noise_ctl[i];
 1136         }
 1137 
 1138         /* XXX ext radios? */
 1139 
 1140         /* XXX EVM? */
 1141 }
 1142 
 1143 struct ieee80211_node *
 1144 ieee80211_alloc_node(struct ieee80211_node_table *nt,
 1145         struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1146 {
 1147         struct ieee80211com *ic = nt->nt_ic;
 1148         struct ieee80211_node *ni;
 1149         int hash;
 1150 
 1151         ni = ic->ic_node_alloc(vap, macaddr);
 1152         if (ni == NULL) {
 1153                 vap->iv_stats.is_rx_nodealloc++;
 1154                 return NULL;
 1155         }
 1156 
 1157         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1158                 "%s %p<%s> in %s table\n", __func__, ni,
 1159                 ether_sprintf(macaddr), nt->nt_name);
 1160 
 1161         IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
 1162         hash = IEEE80211_NODE_HASH(ic, macaddr);
 1163         ieee80211_node_initref(ni);             /* mark referenced */
 1164         ni->ni_chan = IEEE80211_CHAN_ANYC;
 1165         ni->ni_authmode = IEEE80211_AUTH_OPEN;
 1166         ni->ni_txpower = ic->ic_txpowlimit;     /* max power */
 1167         ni->ni_txparms = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
 1168         ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
 1169         ni->ni_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
 1170         ni->ni_inact_reload = nt->nt_inact_init;
 1171         ni->ni_inact = ni->ni_inact_reload;
 1172         ni->ni_ath_defkeyix = 0x7fff;
 1173         ieee80211_psq_init(&ni->ni_psq, "unknown");
 1174 #ifdef IEEE80211_SUPPORT_MESH
 1175         if (vap->iv_opmode == IEEE80211_M_MBSS)
 1176                 ieee80211_mesh_node_init(vap, ni);
 1177 #endif
 1178         IEEE80211_NODE_LOCK(nt);
 1179         TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
 1180         LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
 1181         ni->ni_table = nt;
 1182         ni->ni_vap = vap;
 1183         ni->ni_ic = ic;
 1184         IEEE80211_NODE_UNLOCK(nt);
 1185 
 1186         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 1187             "%s: inact_reload %u", __func__, ni->ni_inact_reload);
 1188 
 1189         ieee80211_ratectl_node_init(ni);
 1190 
 1191         return ni;
 1192 }
 1193 
 1194 /*
 1195  * Craft a temporary node suitable for sending a management frame
 1196  * to the specified station.  We craft only as much state as we
 1197  * need to do the work since the node will be immediately reclaimed
 1198  * once the send completes.
 1199  */
 1200 struct ieee80211_node *
 1201 ieee80211_tmp_node(struct ieee80211vap *vap,
 1202         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1203 {
 1204         struct ieee80211com *ic = vap->iv_ic;
 1205         struct ieee80211_node *ni;
 1206 
 1207         ni = ic->ic_node_alloc(vap, macaddr);
 1208         if (ni != NULL) {
 1209                 struct ieee80211_node *bss = vap->iv_bss;
 1210 
 1211                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1212                         "%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
 1213 
 1214                 ni->ni_table = NULL;            /* NB: pedantic */
 1215                 ni->ni_ic = ic;                 /* NB: needed to set channel */
 1216                 ni->ni_vap = vap;
 1217 
 1218                 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
 1219                 IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
 1220                 ieee80211_node_initref(ni);             /* mark referenced */
 1221                 /* NB: required by ieee80211_fix_rate */
 1222                 ieee80211_node_set_chan(ni, bss->ni_chan);
 1223                 ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
 1224                         IEEE80211_KEYIX_NONE);
 1225                 ni->ni_txpower = bss->ni_txpower;
 1226                 /* XXX optimize away */
 1227                 ieee80211_psq_init(&ni->ni_psq, "unknown");
 1228 
 1229                 ieee80211_ratectl_node_init(ni);
 1230         } else {
 1231                 /* XXX msg */
 1232                 vap->iv_stats.is_rx_nodealloc++;
 1233         }
 1234         return ni;
 1235 }
 1236 
 1237 struct ieee80211_node *
 1238 ieee80211_dup_bss(struct ieee80211vap *vap,
 1239         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1240 {
 1241         struct ieee80211com *ic = vap->iv_ic;
 1242         struct ieee80211_node *ni;
 1243 
 1244         ni = ieee80211_alloc_node(&ic->ic_sta, vap, macaddr);
 1245         if (ni != NULL) {
 1246                 struct ieee80211_node *bss = vap->iv_bss;
 1247                 /*
 1248                  * Inherit from iv_bss.
 1249                  */
 1250                 copy_bss(ni, bss);
 1251                 IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
 1252                 ieee80211_node_set_chan(ni, bss->ni_chan);
 1253         }
 1254         return ni;
 1255 }
 1256 
 1257 /*
 1258  * Create a bss node for a legacy WDS vap.  The far end does
 1259  * not associate so we just create create a new node and
 1260  * simulate an association.  The caller is responsible for
 1261  * installing the node as the bss node and handling any further
 1262  * setup work like authorizing the port.
 1263  */
 1264 struct ieee80211_node *
 1265 ieee80211_node_create_wds(struct ieee80211vap *vap,
 1266         const uint8_t bssid[IEEE80211_ADDR_LEN], struct ieee80211_channel *chan)
 1267 {
 1268         struct ieee80211com *ic = vap->iv_ic;
 1269         struct ieee80211_node *ni;
 1270 
 1271         /* XXX check if node already in sta table? */
 1272         ni = ieee80211_alloc_node(&ic->ic_sta, vap, bssid);
 1273         if (ni != NULL) {
 1274                 ni->ni_wdsvap = vap;
 1275                 IEEE80211_ADDR_COPY(ni->ni_bssid, bssid);
 1276                 /*
 1277                  * Inherit any manually configured settings.
 1278                  */
 1279                 copy_bss(ni, vap->iv_bss);
 1280                 ieee80211_node_set_chan(ni, chan);
 1281                 /* NB: propagate ssid so available to WPA supplicant */
 1282                 ni->ni_esslen = vap->iv_des_ssid[0].len;
 1283                 memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
 1284                 /* NB: no associd for peer */
 1285                 /*
 1286                  * There are no management frames to use to
 1287                  * discover neighbor capabilities, so blindly
 1288                  * propagate the local configuration.
 1289                  */
 1290                 if (vap->iv_flags & IEEE80211_F_WME)
 1291                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1292 #ifdef IEEE80211_SUPPORT_SUPERG
 1293                 if (vap->iv_flags & IEEE80211_F_FF)
 1294                         ni->ni_flags |= IEEE80211_NODE_FF;
 1295 #endif
 1296                 if ((ic->ic_htcaps & IEEE80211_HTC_HT) &&
 1297                     (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1298                         /*
 1299                          * Device is HT-capable and HT is enabled for
 1300                          * the vap; setup HT operation.  On return
 1301                          * ni_chan will be adjusted to an HT channel.
 1302                          */
 1303                         ieee80211_ht_wds_init(ni);
 1304                 } else {
 1305                         struct ieee80211_channel *c = ni->ni_chan;
 1306                         /*
 1307                          * Force a legacy channel to be used.
 1308                          */
 1309                         c = ieee80211_find_channel(ic,
 1310                             c->ic_freq, c->ic_flags &~ IEEE80211_CHAN_HT);
 1311                         KASSERT(c != NULL, ("no legacy channel, %u/%x",
 1312                             ni->ni_chan->ic_freq, ni->ni_chan->ic_flags));
 1313                         ni->ni_chan = c;
 1314                 }
 1315         }
 1316         return ni;
 1317 }
 1318 
 1319 struct ieee80211_node *
 1320 #ifdef IEEE80211_DEBUG_REFCNT
 1321 ieee80211_find_node_locked_debug(struct ieee80211_node_table *nt,
 1322         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1323 #else
 1324 ieee80211_find_node_locked(struct ieee80211_node_table *nt,
 1325         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1326 #endif
 1327 {
 1328         struct ieee80211_node *ni;
 1329         int hash;
 1330 
 1331         IEEE80211_NODE_LOCK_ASSERT(nt);
 1332 
 1333         hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
 1334         LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
 1335                 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
 1336                         ieee80211_ref_node(ni); /* mark referenced */
 1337 #ifdef IEEE80211_DEBUG_REFCNT
 1338                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1339                             "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
 1340                             func, line,
 1341                             ni, ether_sprintf(ni->ni_macaddr),
 1342                             ieee80211_node_refcnt(ni));
 1343 #endif
 1344                         return ni;
 1345                 }
 1346         }
 1347         return NULL;
 1348 }
 1349 
 1350 struct ieee80211_node *
 1351 #ifdef IEEE80211_DEBUG_REFCNT
 1352 ieee80211_find_node_debug(struct ieee80211_node_table *nt,
 1353         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1354 #else
 1355 ieee80211_find_node(struct ieee80211_node_table *nt,
 1356         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1357 #endif
 1358 {
 1359         struct ieee80211_node *ni;
 1360 
 1361         IEEE80211_NODE_LOCK(nt);
 1362         ni = ieee80211_find_node_locked(nt, macaddr);
 1363         IEEE80211_NODE_UNLOCK(nt);
 1364         return ni;
 1365 }
 1366 
 1367 struct ieee80211_node *
 1368 #ifdef IEEE80211_DEBUG_REFCNT
 1369 ieee80211_find_vap_node_locked_debug(struct ieee80211_node_table *nt,
 1370         const struct ieee80211vap *vap,
 1371         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1372 #else
 1373 ieee80211_find_vap_node_locked(struct ieee80211_node_table *nt,
 1374         const struct ieee80211vap *vap,
 1375         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1376 #endif
 1377 {
 1378         struct ieee80211_node *ni;
 1379         int hash;
 1380 
 1381         IEEE80211_NODE_LOCK_ASSERT(nt);
 1382 
 1383         hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
 1384         LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
 1385                 if (ni->ni_vap == vap &&
 1386                     IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
 1387                         ieee80211_ref_node(ni); /* mark referenced */
 1388 #ifdef IEEE80211_DEBUG_REFCNT
 1389                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1390                             "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
 1391                             func, line,
 1392                             ni, ether_sprintf(ni->ni_macaddr),
 1393                             ieee80211_node_refcnt(ni));
 1394 #endif
 1395                         return ni;
 1396                 }
 1397         }
 1398         return NULL;
 1399 }
 1400 
 1401 struct ieee80211_node *
 1402 #ifdef IEEE80211_DEBUG_REFCNT
 1403 ieee80211_find_vap_node_debug(struct ieee80211_node_table *nt,
 1404         const struct ieee80211vap *vap,
 1405         const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
 1406 #else
 1407 ieee80211_find_vap_node(struct ieee80211_node_table *nt,
 1408         const struct ieee80211vap *vap,
 1409         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1410 #endif
 1411 {
 1412         struct ieee80211_node *ni;
 1413 
 1414         IEEE80211_NODE_LOCK(nt);
 1415         ni = ieee80211_find_vap_node_locked(nt, vap, macaddr);
 1416         IEEE80211_NODE_UNLOCK(nt);
 1417         return ni;
 1418 }
 1419 
 1420 /*
 1421  * Fake up a node; this handles node discovery in adhoc mode.
 1422  * Note that for the driver's benefit we we treat this like
 1423  * an association so the driver has an opportunity to setup
 1424  * it's private state.
 1425  */
 1426 struct ieee80211_node *
 1427 ieee80211_fakeup_adhoc_node(struct ieee80211vap *vap,
 1428         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1429 {
 1430         struct ieee80211_node *ni;
 1431 
 1432         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE | IEEE80211_MSG_ASSOC,
 1433             "%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
 1434         ni = ieee80211_dup_bss(vap, macaddr);
 1435         if (ni != NULL) {
 1436                 struct ieee80211com *ic = vap->iv_ic;
 1437 
 1438                 /* XXX no rate negotiation; just dup */
 1439                 ni->ni_rates = vap->iv_bss->ni_rates;
 1440                 if (ieee80211_iserp_rateset(&ni->ni_rates))
 1441                         ni->ni_flags |= IEEE80211_NODE_ERP;
 1442                 if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
 1443                         /*
 1444                          * In adhoc demo mode there are no management
 1445                          * frames to use to discover neighbor capabilities,
 1446                          * so blindly propagate the local configuration 
 1447                          * so we can do interesting things (e.g. use
 1448                          * WME to disable ACK's).
 1449                          */
 1450                         if (vap->iv_flags & IEEE80211_F_WME)
 1451                                 ni->ni_flags |= IEEE80211_NODE_QOS;
 1452 #ifdef IEEE80211_SUPPORT_SUPERG
 1453                         if (vap->iv_flags & IEEE80211_F_FF)
 1454                                 ni->ni_flags |= IEEE80211_NODE_FF;
 1455 #endif
 1456                 }
 1457                 ieee80211_node_setuptxparms(ni);
 1458                 ieee80211_ratectl_node_init(ni);
 1459                 if (ic->ic_newassoc != NULL)
 1460                         ic->ic_newassoc(ni, 1);
 1461                 /* XXX not right for 802.1x/WPA */
 1462                 ieee80211_node_authorize(ni);
 1463         }
 1464         return ni;
 1465 }
 1466 
 1467 void
 1468 ieee80211_init_neighbor(struct ieee80211_node *ni,
 1469         const struct ieee80211_frame *wh,
 1470         const struct ieee80211_scanparams *sp)
 1471 {
 1472         int do_ht_setup = 0;
 1473 
 1474         ni->ni_esslen = sp->ssid[1];
 1475         memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
 1476         IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
 1477         memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
 1478         ni->ni_intval = sp->bintval;
 1479         ni->ni_capinfo = sp->capinfo;
 1480         ni->ni_chan = ni->ni_ic->ic_curchan;
 1481         ni->ni_fhdwell = sp->fhdwell;
 1482         ni->ni_fhindex = sp->fhindex;
 1483         ni->ni_erp = sp->erp;
 1484         ni->ni_timoff = sp->timoff;
 1485 #ifdef IEEE80211_SUPPORT_MESH
 1486         if (ni->ni_vap->iv_opmode == IEEE80211_M_MBSS)
 1487                 ieee80211_mesh_init_neighbor(ni, wh, sp);
 1488 #endif
 1489         if (ieee80211_ies_init(&ni->ni_ies, sp->ies, sp->ies_len)) {
 1490                 ieee80211_ies_expand(&ni->ni_ies);
 1491                 if (ni->ni_ies.wme_ie != NULL)
 1492                         ni->ni_flags |= IEEE80211_NODE_QOS;
 1493                 else
 1494                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
 1495 #ifdef IEEE80211_SUPPORT_SUPERG
 1496                 if (ni->ni_ies.ath_ie != NULL)
 1497                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
 1498 #endif
 1499                 if (ni->ni_ies.htcap_ie != NULL)
 1500                         ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
 1501                 if (ni->ni_ies.htinfo_ie != NULL)
 1502                         ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
 1503 
 1504                 if ((ni->ni_ies.htcap_ie != NULL) &&
 1505                     (ni->ni_ies.htinfo_ie != NULL) &&
 1506                     (ni->ni_vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 1507                         do_ht_setup = 1;
 1508                 }
 1509         }
 1510 
 1511         /* NB: must be after ni_chan is setup */
 1512         ieee80211_setup_rates(ni, sp->rates, sp->xrates,
 1513                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1514                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1515 
 1516         /*
 1517          * If the neighbor is HT compatible, flip that on.
 1518          */
 1519         if (do_ht_setup) {
 1520                 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
 1521                     "%s: doing HT setup\n", __func__);
 1522                 ieee80211_ht_node_init(ni);
 1523                 ieee80211_ht_updateparams(ni,
 1524                     ni->ni_ies.htcap_ie,
 1525                     ni->ni_ies.htinfo_ie);
 1526                 ieee80211_setup_htrates(ni,
 1527                     ni->ni_ies.htcap_ie,
 1528                     IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
 1529                 ieee80211_setup_basic_htrates(ni,
 1530                     ni->ni_ies.htinfo_ie);
 1531                 ieee80211_node_setuptxparms(ni);
 1532                 ieee80211_ratectl_node_init(ni);
 1533         }
 1534 }
 1535 
 1536 /*
 1537  * Do node discovery in adhoc mode on receipt of a beacon
 1538  * or probe response frame.  Note that for the driver's
 1539  * benefit we we treat this like an association so the
 1540  * driver has an opportunity to setup it's private state.
 1541  */
 1542 struct ieee80211_node *
 1543 ieee80211_add_neighbor(struct ieee80211vap *vap,
 1544         const struct ieee80211_frame *wh,
 1545         const struct ieee80211_scanparams *sp)
 1546 {
 1547         struct ieee80211_node *ni;
 1548 
 1549         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
 1550             "%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
 1551         ni = ieee80211_dup_bss(vap, wh->i_addr2);/* XXX alloc_node? */
 1552         if (ni != NULL) {
 1553                 struct ieee80211com *ic = vap->iv_ic;
 1554 
 1555                 ieee80211_init_neighbor(ni, wh, sp);
 1556                 if (ieee80211_iserp_rateset(&ni->ni_rates))
 1557                         ni->ni_flags |= IEEE80211_NODE_ERP;
 1558                 ieee80211_node_setuptxparms(ni);
 1559                 ieee80211_ratectl_node_init(ni);
 1560                 if (ic->ic_newassoc != NULL)
 1561                         ic->ic_newassoc(ni, 1);
 1562                 /* XXX not right for 802.1x/WPA */
 1563                 ieee80211_node_authorize(ni);
 1564         }
 1565         return ni;
 1566 }
 1567 
 1568 #define IS_PROBEREQ(wh) \
 1569         ((wh->i_fc[0] & (IEEE80211_FC0_TYPE_MASK|IEEE80211_FC0_SUBTYPE_MASK)) \
 1570             == (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ))
 1571 #define IS_BCAST_PROBEREQ(wh) \
 1572         (IS_PROBEREQ(wh) && IEEE80211_IS_MULTICAST( \
 1573             ((const struct ieee80211_frame *)(wh))->i_addr3))
 1574 
 1575 static __inline struct ieee80211_node *
 1576 _find_rxnode(struct ieee80211_node_table *nt,
 1577     const struct ieee80211_frame_min *wh)
 1578 {
 1579         if (IS_BCAST_PROBEREQ(wh))
 1580                 return NULL;            /* spam bcast probe req to all vap's */
 1581         return ieee80211_find_node_locked(nt, wh->i_addr2);
 1582 }
 1583 
 1584 /*
 1585  * Locate the node for sender, track state, and then pass the
 1586  * (referenced) node up to the 802.11 layer for its use.  Note
 1587  * we can return NULL if the sender is not in the table.
 1588  */
 1589 struct ieee80211_node *
 1590 #ifdef IEEE80211_DEBUG_REFCNT
 1591 ieee80211_find_rxnode_debug(struct ieee80211com *ic,
 1592         const struct ieee80211_frame_min *wh, const char *func, int line)
 1593 #else
 1594 ieee80211_find_rxnode(struct ieee80211com *ic,
 1595         const struct ieee80211_frame_min *wh)
 1596 #endif
 1597 {
 1598         struct ieee80211_node_table *nt;
 1599         struct ieee80211_node *ni;
 1600 
 1601         nt = &ic->ic_sta;
 1602         IEEE80211_NODE_LOCK(nt);
 1603         ni = _find_rxnode(nt, wh);
 1604         IEEE80211_NODE_UNLOCK(nt);
 1605 
 1606         return ni;
 1607 }
 1608 
 1609 /*
 1610  * Like ieee80211_find_rxnode but use the supplied h/w
 1611  * key index as a hint to locate the node in the key
 1612  * mapping table.  If an entry is present at the key
 1613  * index we return it; otherwise do a normal lookup and
 1614  * update the mapping table if the station has a unicast
 1615  * key assigned to it.
 1616  */
 1617 struct ieee80211_node *
 1618 #ifdef IEEE80211_DEBUG_REFCNT
 1619 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
 1620         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
 1621         const char *func, int line)
 1622 #else
 1623 ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
 1624         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
 1625 #endif
 1626 {
 1627         struct ieee80211_node_table *nt;
 1628         struct ieee80211_node *ni;
 1629 
 1630         nt = &ic->ic_sta;
 1631         IEEE80211_NODE_LOCK(nt);
 1632         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
 1633                 ni = nt->nt_keyixmap[keyix];
 1634         else
 1635                 ni = NULL;
 1636         if (ni == NULL) {
 1637                 ni = _find_rxnode(nt, wh);
 1638                 if (ni != NULL && nt->nt_keyixmap != NULL) {
 1639                         /*
 1640                          * If the station has a unicast key cache slot
 1641                          * assigned update the key->node mapping table.
 1642                          */
 1643                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1644                         /* XXX can keyixmap[keyix] != NULL? */
 1645                         if (keyix < nt->nt_keyixmax &&
 1646                             nt->nt_keyixmap[keyix] == NULL) {
 1647                                 IEEE80211_DPRINTF(ni->ni_vap,
 1648                                     IEEE80211_MSG_NODE,
 1649                                     "%s: add key map entry %p<%s> refcnt %d\n",
 1650                                     __func__, ni, ether_sprintf(ni->ni_macaddr),
 1651                                     ieee80211_node_refcnt(ni)+1);
 1652                                 nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
 1653                         }
 1654                 }
 1655         } else {
 1656                 if (IS_BCAST_PROBEREQ(wh))
 1657                         ni = NULL;      /* spam bcast probe req to all vap's */
 1658                 else
 1659                         ieee80211_ref_node(ni);
 1660         }
 1661         IEEE80211_NODE_UNLOCK(nt);
 1662 
 1663         return ni;
 1664 }
 1665 #undef IS_BCAST_PROBEREQ
 1666 #undef IS_PROBEREQ
 1667 
 1668 /*
 1669  * Return a reference to the appropriate node for sending
 1670  * a data frame.  This handles node discovery in adhoc networks.
 1671  */
 1672 struct ieee80211_node *
 1673 #ifdef IEEE80211_DEBUG_REFCNT
 1674 ieee80211_find_txnode_debug(struct ieee80211vap *vap,
 1675         const uint8_t macaddr[IEEE80211_ADDR_LEN],
 1676         const char *func, int line)
 1677 #else
 1678 ieee80211_find_txnode(struct ieee80211vap *vap,
 1679         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1680 #endif
 1681 {
 1682         struct ieee80211_node_table *nt = &vap->iv_ic->ic_sta;
 1683         struct ieee80211_node *ni;
 1684 
 1685         /*
 1686          * The destination address should be in the node table
 1687          * unless this is a multicast/broadcast frame.  We can
 1688          * also optimize station mode operation, all frames go
 1689          * to the bss node.
 1690          */
 1691         /* XXX can't hold lock across dup_bss 'cuz of recursive locking */
 1692         IEEE80211_NODE_LOCK(nt);
 1693         if (vap->iv_opmode == IEEE80211_M_STA ||
 1694             vap->iv_opmode == IEEE80211_M_WDS ||
 1695             IEEE80211_IS_MULTICAST(macaddr))
 1696                 ni = ieee80211_ref_node(vap->iv_bss);
 1697         else
 1698                 ni = ieee80211_find_node_locked(nt, macaddr);
 1699         IEEE80211_NODE_UNLOCK(nt);
 1700 
 1701         if (ni == NULL) {
 1702                 if (vap->iv_opmode == IEEE80211_M_IBSS ||
 1703                     vap->iv_opmode == IEEE80211_M_AHDEMO) {
 1704                         /*
 1705                          * In adhoc mode cons up a node for the destination.
 1706                          * Note that we need an additional reference for the
 1707                          * caller to be consistent with
 1708                          * ieee80211_find_node_locked.
 1709                          */
 1710                         ni = ieee80211_fakeup_adhoc_node(vap, macaddr);
 1711                         if (ni != NULL)
 1712                                 (void) ieee80211_ref_node(ni);
 1713                 } else {
 1714                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, macaddr,
 1715                             "no node, discard frame (%s)", __func__);
 1716                         vap->iv_stats.is_tx_nonode++;
 1717                 }
 1718         }
 1719         return ni;
 1720 }
 1721 
 1722 static void
 1723 _ieee80211_free_node(struct ieee80211_node *ni)
 1724 {
 1725         struct ieee80211_node_table *nt = ni->ni_table;
 1726 
 1727         /*
 1728          * NB: careful about referencing the vap as it may be
 1729          * gone if the last reference was held by a driver.
 1730          * We know the com will always be present so it's safe
 1731          * to use ni_ic below to reclaim resources.
 1732          */
 1733 #if 0
 1734         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1735                 "%s %p<%s> in %s table\n", __func__, ni,
 1736                 ether_sprintf(ni->ni_macaddr),
 1737                 nt != NULL ? nt->nt_name : "<gone>");
 1738 #endif
 1739         if (ni->ni_associd != 0) {
 1740                 struct ieee80211vap *vap = ni->ni_vap;
 1741                 if (vap->iv_aid_bitmap != NULL)
 1742                         IEEE80211_AID_CLR(vap, ni->ni_associd);
 1743         }
 1744         if (nt != NULL) {
 1745                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1746                 LIST_REMOVE(ni, ni_hash);
 1747         }
 1748         ni->ni_ic->ic_node_free(ni);
 1749 }
 1750 
 1751 void
 1752 #ifdef IEEE80211_DEBUG_REFCNT
 1753 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
 1754 #else
 1755 ieee80211_free_node(struct ieee80211_node *ni)
 1756 #endif
 1757 {
 1758         struct ieee80211_node_table *nt = ni->ni_table;
 1759 
 1760 #ifdef IEEE80211_DEBUG_REFCNT
 1761         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1762                 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
 1763                  ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
 1764 #endif
 1765         if (nt != NULL) {
 1766                 IEEE80211_NODE_LOCK(nt);
 1767                 if (ieee80211_node_dectestref(ni)) {
 1768                         /*
 1769                          * Last reference, reclaim state.
 1770                          */
 1771                         _ieee80211_free_node(ni);
 1772                 } else if (ieee80211_node_refcnt(ni) == 1 &&
 1773                     nt->nt_keyixmap != NULL) {
 1774                         ieee80211_keyix keyix;
 1775                         /*
 1776                          * Check for a last reference in the key mapping table.
 1777                          */
 1778                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1779                         if (keyix < nt->nt_keyixmax &&
 1780                             nt->nt_keyixmap[keyix] == ni) {
 1781                                 IEEE80211_DPRINTF(ni->ni_vap,
 1782                                     IEEE80211_MSG_NODE,
 1783                                     "%s: %p<%s> clear key map entry", __func__,
 1784                                     ni, ether_sprintf(ni->ni_macaddr));
 1785                                 nt->nt_keyixmap[keyix] = NULL;
 1786                                 ieee80211_node_decref(ni); /* XXX needed? */
 1787                                 _ieee80211_free_node(ni);
 1788                         }
 1789                 }
 1790                 IEEE80211_NODE_UNLOCK(nt);
 1791         } else {
 1792                 if (ieee80211_node_dectestref(ni))
 1793                         _ieee80211_free_node(ni);
 1794         }
 1795 }
 1796 
 1797 /*
 1798  * Reclaim a unicast key and clear any key cache state.
 1799  */
 1800 int
 1801 ieee80211_node_delucastkey(struct ieee80211_node *ni)
 1802 {
 1803         struct ieee80211com *ic = ni->ni_ic;
 1804         struct ieee80211_node_table *nt = &ic->ic_sta;
 1805         struct ieee80211_node *nikey;
 1806         ieee80211_keyix keyix;
 1807         int isowned, status;
 1808 
 1809         /*
 1810          * NB: We must beware of LOR here; deleting the key
 1811          * can cause the crypto layer to block traffic updates
 1812          * which can generate a LOR against the node table lock;
 1813          * grab it here and stash the key index for our use below.
 1814          *
 1815          * Must also beware of recursion on the node table lock.
 1816          * When called from node_cleanup we may already have
 1817          * the node table lock held.  Unfortunately there's no
 1818          * way to separate out this path so we must do this
 1819          * conditionally.
 1820          */
 1821         isowned = IEEE80211_NODE_IS_LOCKED(nt);
 1822         if (!isowned)
 1823                 IEEE80211_NODE_LOCK(nt);
 1824         nikey = NULL;
 1825         status = 1;             /* NB: success */
 1826         if (ni->ni_ucastkey.wk_keyix != IEEE80211_KEYIX_NONE) {
 1827                 keyix = ni->ni_ucastkey.wk_rxkeyix;
 1828                 status = ieee80211_crypto_delkey(ni->ni_vap, &ni->ni_ucastkey);
 1829                 if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
 1830                         nikey = nt->nt_keyixmap[keyix];
 1831                         nt->nt_keyixmap[keyix] = NULL;
 1832                 }
 1833         }
 1834         if (!isowned)
 1835                 IEEE80211_NODE_UNLOCK(nt);
 1836 
 1837         if (nikey != NULL) {
 1838                 KASSERT(nikey == ni,
 1839                         ("key map out of sync, ni %p nikey %p", ni, nikey));
 1840                 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1841                         "%s: delete key map entry %p<%s> refcnt %d\n",
 1842                         __func__, ni, ether_sprintf(ni->ni_macaddr),
 1843                         ieee80211_node_refcnt(ni)-1);
 1844                 ieee80211_free_node(ni);
 1845         }
 1846         return status;
 1847 }
 1848 
 1849 /*
 1850  * Reclaim a node.  If this is the last reference count then
 1851  * do the normal free work.  Otherwise remove it from the node
 1852  * table and mark it gone by clearing the back-reference.
 1853  */
 1854 static void
 1855 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 1856 {
 1857         ieee80211_keyix keyix;
 1858 
 1859         IEEE80211_NODE_LOCK_ASSERT(nt);
 1860 
 1861         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1862                 "%s: remove %p<%s> from %s table, refcnt %d\n",
 1863                 __func__, ni, ether_sprintf(ni->ni_macaddr),
 1864                 nt->nt_name, ieee80211_node_refcnt(ni)-1);
 1865         /*
 1866          * Clear any entry in the unicast key mapping table.
 1867          * We need to do it here so rx lookups don't find it
 1868          * in the mapping table even if it's not in the hash
 1869          * table.  We cannot depend on the mapping table entry
 1870          * being cleared because the node may not be free'd.
 1871          */
 1872         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1873         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
 1874             nt->nt_keyixmap[keyix] == ni) {
 1875                 IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
 1876                         "%s: %p<%s> clear key map entry %u\n",
 1877                         __func__, ni, ether_sprintf(ni->ni_macaddr), keyix);
 1878                 nt->nt_keyixmap[keyix] = NULL;
 1879                 ieee80211_node_decref(ni);      /* NB: don't need free */
 1880         }
 1881         if (!ieee80211_node_dectestref(ni)) {
 1882                 /*
 1883                  * Other references are present, just remove the
 1884                  * node from the table so it cannot be found.  When
 1885                  * the references are dropped storage will be
 1886                  * reclaimed.
 1887                  */
 1888                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1889                 LIST_REMOVE(ni, ni_hash);
 1890                 ni->ni_table = NULL;            /* clear reference */
 1891         } else
 1892                 _ieee80211_free_node(ni);
 1893 }
 1894 
 1895 /*
 1896  * Node table support.
 1897  */
 1898 
 1899 static void
 1900 ieee80211_node_table_init(struct ieee80211com *ic,
 1901         struct ieee80211_node_table *nt,
 1902         const char *name, int inact, int keyixmax)
 1903 {
 1904         struct ifnet *ifp = ic->ic_ifp;
 1905 
 1906         nt->nt_ic = ic;
 1907         IEEE80211_NODE_LOCK_INIT(nt, ifp->if_xname);
 1908         IEEE80211_NODE_ITERATE_LOCK_INIT(nt, ifp->if_xname);
 1909         TAILQ_INIT(&nt->nt_node);
 1910         nt->nt_name = name;
 1911         nt->nt_scangen = 1;
 1912         nt->nt_inact_init = inact;
 1913         nt->nt_keyixmax = keyixmax;
 1914         if (nt->nt_keyixmax > 0) {
 1915                 nt->nt_keyixmap = (struct ieee80211_node **) malloc(
 1916                         keyixmax * sizeof(struct ieee80211_node *),
 1917                         M_80211_NODE, M_NOWAIT | M_ZERO);
 1918                 if (nt->nt_keyixmap == NULL)
 1919                         if_printf(ic->ic_ifp,
 1920                             "Cannot allocate key index map with %u entries\n",
 1921                             keyixmax);
 1922         } else
 1923                 nt->nt_keyixmap = NULL;
 1924 }
 1925 
 1926 static void
 1927 ieee80211_node_table_reset(struct ieee80211_node_table *nt,
 1928         struct ieee80211vap *match)
 1929 {
 1930         struct ieee80211_node *ni, *next;
 1931 
 1932         IEEE80211_NODE_LOCK(nt);
 1933         TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next) {
 1934                 if (match != NULL && ni->ni_vap != match)
 1935                         continue;
 1936                 /* XXX can this happen?  if so need's work */
 1937                 if (ni->ni_associd != 0) {
 1938                         struct ieee80211vap *vap = ni->ni_vap;
 1939 
 1940                         if (vap->iv_auth->ia_node_leave != NULL)
 1941                                 vap->iv_auth->ia_node_leave(ni);
 1942                         if (vap->iv_aid_bitmap != NULL)
 1943                                 IEEE80211_AID_CLR(vap, ni->ni_associd);
 1944                 }
 1945                 ni->ni_wdsvap = NULL;           /* clear reference */
 1946                 node_reclaim(nt, ni);
 1947         }
 1948         if (match != NULL && match->iv_opmode == IEEE80211_M_WDS) {
 1949                 /*
 1950                  * Make a separate pass to clear references to this vap
 1951                  * held by DWDS entries.  They will not be matched above
 1952                  * because ni_vap will point to the ap vap but we still
 1953                  * need to clear ni_wdsvap when the WDS vap is destroyed
 1954                  * and/or reset.
 1955                  */
 1956                 TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next)
 1957                         if (ni->ni_wdsvap == match)
 1958                                 ni->ni_wdsvap = NULL;
 1959         }
 1960         IEEE80211_NODE_UNLOCK(nt);
 1961 }
 1962 
 1963 static void
 1964 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
 1965 {
 1966         ieee80211_node_table_reset(nt, NULL);
 1967         if (nt->nt_keyixmap != NULL) {
 1968 #ifdef DIAGNOSTIC
 1969                 /* XXX verify all entries are NULL */
 1970                 int i;
 1971                 for (i = 0; i < nt->nt_keyixmax; i++)
 1972                         if (nt->nt_keyixmap[i] != NULL)
 1973                                 printf("%s: %s[%u] still active\n", __func__,
 1974                                         nt->nt_name, i);
 1975 #endif
 1976                 free(nt->nt_keyixmap, M_80211_NODE);
 1977                 nt->nt_keyixmap = NULL;
 1978         }
 1979         IEEE80211_NODE_ITERATE_LOCK_DESTROY(nt);
 1980         IEEE80211_NODE_LOCK_DESTROY(nt);
 1981 }
 1982 
 1983 /*
 1984  * Timeout inactive stations and do related housekeeping.
 1985  * Note that we cannot hold the node lock while sending a
 1986  * frame as this would lead to a LOR.  Instead we use a
 1987  * generation number to mark nodes that we've scanned and
 1988  * drop the lock and restart a scan if we have to time out
 1989  * a node.  Since we are single-threaded by virtue of
 1990  * controlling the inactivity timer we can be sure this will
 1991  * process each node only once.
 1992  */
 1993 static void
 1994 ieee80211_timeout_stations(struct ieee80211com *ic)
 1995 {
 1996         struct ieee80211_node_table *nt = &ic->ic_sta;
 1997         struct ieee80211vap *vap;
 1998         struct ieee80211_node *ni;
 1999         int gen = 0;
 2000 
 2001         IEEE80211_NODE_ITERATE_LOCK(nt);
 2002         gen = ++nt->nt_scangen;
 2003 restart:
 2004         IEEE80211_NODE_LOCK(nt);
 2005         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 2006                 if (ni->ni_scangen == gen)      /* previously handled */
 2007                         continue;
 2008                 ni->ni_scangen = gen;
 2009                 /*
 2010                  * Ignore entries for which have yet to receive an
 2011                  * authentication frame.  These are transient and
 2012                  * will be reclaimed when the last reference to them
 2013                  * goes away (when frame xmits complete).
 2014                  */
 2015                 vap = ni->ni_vap;
 2016                 /*
 2017                  * Only process stations when in RUN state.  This
 2018                  * insures, for example, that we don't timeout an
 2019                  * inactive station during CAC.  Note that CSA state
 2020                  * is actually handled in ieee80211_node_timeout as
 2021                  * it applies to more than timeout processing.
 2022                  */
 2023                 if (vap->iv_state != IEEE80211_S_RUN)
 2024                         continue;
 2025                 /* XXX can vap be NULL? */
 2026                 if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
 2027                      vap->iv_opmode == IEEE80211_M_STA) &&
 2028                     (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 2029                         continue;
 2030                 /*
 2031                  * Free fragment if not needed anymore
 2032                  * (last fragment older than 1s).
 2033                  * XXX doesn't belong here, move to node_age
 2034                  */
 2035                 if (ni->ni_rxfrag[0] != NULL &&
 2036                     ticks > ni->ni_rxfragstamp + hz) {
 2037                         m_freem(ni->ni_rxfrag[0]);
 2038                         ni->ni_rxfrag[0] = NULL;
 2039                 }
 2040                 if (ni->ni_inact > 0) {
 2041                         ni->ni_inact--;
 2042                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 2043                             "%s: inact %u inact_reload %u nrates %u",
 2044                             __func__, ni->ni_inact, ni->ni_inact_reload,
 2045                             ni->ni_rates.rs_nrates);
 2046                 }
 2047                 /*
 2048                  * Special case ourself; we may be idle for extended periods
 2049                  * of time and regardless reclaiming our state is wrong.
 2050                  * XXX run ic_node_age
 2051                  */
 2052                 if (ni == vap->iv_bss)
 2053                         continue;
 2054                 if (ni->ni_associd != 0 || 
 2055                     (vap->iv_opmode == IEEE80211_M_IBSS ||
 2056                      vap->iv_opmode == IEEE80211_M_AHDEMO)) {
 2057                         /*
 2058                          * Age/drain resources held by the station.
 2059                          */
 2060                         ic->ic_node_age(ni);
 2061                         /*
 2062                          * Probe the station before time it out.  We
 2063                          * send a null data frame which may not be
 2064                          * universally supported by drivers (need it
 2065                          * for ps-poll support so it should be...).
 2066                          *
 2067                          * XXX don't probe the station unless we've
 2068                          *     received a frame from them (and have
 2069                          *     some idea of the rates they are capable
 2070                          *     of); this will get fixed more properly
 2071                          *     soon with better handling of the rate set.
 2072                          */
 2073                         if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
 2074                             (0 < ni->ni_inact &&
 2075                              ni->ni_inact <= vap->iv_inact_probe) &&
 2076                             ni->ni_rates.rs_nrates != 0) {
 2077                                 IEEE80211_NOTE(vap,
 2078                                     IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
 2079                                     ni, "%s",
 2080                                     "probe station due to inactivity");
 2081                                 /*
 2082                                  * Grab a reference before unlocking the table
 2083                                  * so the node cannot be reclaimed before we
 2084                                  * send the frame. ieee80211_send_nulldata
 2085                                  * understands we've done this and reclaims the
 2086                                  * ref for us as needed.
 2087                                  */
 2088                                 ieee80211_ref_node(ni);
 2089                                 IEEE80211_NODE_UNLOCK(nt);
 2090                                 ieee80211_send_nulldata(ni);
 2091                                 /* XXX stat? */
 2092                                 goto restart;
 2093                         }
 2094                 }
 2095                 if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
 2096                     ni->ni_inact <= 0) {
 2097                         IEEE80211_NOTE(vap,
 2098                             IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
 2099                             "station timed out due to inactivity "
 2100                             "(refcnt %u)", ieee80211_node_refcnt(ni));
 2101                         /*
 2102                          * Send a deauthenticate frame and drop the station.
 2103                          * This is somewhat complicated due to reference counts
 2104                          * and locking.  At this point a station will typically
 2105                          * have a reference count of 1.  ieee80211_node_leave
 2106                          * will do a "free" of the node which will drop the
 2107                          * reference count.  But in the meantime a reference
 2108                          * wil be held by the deauth frame.  The actual reclaim
 2109                          * of the node will happen either after the tx is
 2110                          * completed or by ieee80211_node_leave.
 2111                          *
 2112                          * Separately we must drop the node lock before sending
 2113                          * in case the driver takes a lock, as this can result
 2114                          * in a LOR between the node lock and the driver lock.
 2115                          */
 2116                         ieee80211_ref_node(ni);
 2117                         IEEE80211_NODE_UNLOCK(nt);
 2118                         if (ni->ni_associd != 0) {
 2119                                 IEEE80211_SEND_MGMT(ni,
 2120                                     IEEE80211_FC0_SUBTYPE_DEAUTH,
 2121                                     IEEE80211_REASON_AUTH_EXPIRE);
 2122                         }
 2123                         ieee80211_node_leave(ni);
 2124                         ieee80211_free_node(ni);
 2125                         vap->iv_stats.is_node_timeout++;
 2126                         goto restart;
 2127                 }
 2128         }
 2129         IEEE80211_NODE_UNLOCK(nt);
 2130 
 2131         IEEE80211_NODE_ITERATE_UNLOCK(nt);
 2132 }
 2133 
 2134 /*
 2135  * Aggressively reclaim resources.  This should be used
 2136  * only in a critical situation to reclaim mbuf resources.
 2137  */
 2138 void
 2139 ieee80211_drain(struct ieee80211com *ic)
 2140 {
 2141         struct ieee80211_node_table *nt = &ic->ic_sta;
 2142         struct ieee80211vap *vap;
 2143         struct ieee80211_node *ni;
 2144 
 2145         IEEE80211_NODE_LOCK(nt);
 2146         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 2147                 /*
 2148                  * Ignore entries for which have yet to receive an
 2149                  * authentication frame.  These are transient and
 2150                  * will be reclaimed when the last reference to them
 2151                  * goes away (when frame xmits complete).
 2152                  */
 2153                 vap = ni->ni_vap;
 2154                 /*
 2155                  * Only process stations when in RUN state.  This
 2156                  * insures, for example, that we don't timeout an
 2157                  * inactive station during CAC.  Note that CSA state
 2158                  * is actually handled in ieee80211_node_timeout as
 2159                  * it applies to more than timeout processing.
 2160                  */
 2161                 if (vap->iv_state != IEEE80211_S_RUN)
 2162                         continue;
 2163                 /* XXX can vap be NULL? */
 2164                 if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
 2165                      vap->iv_opmode == IEEE80211_M_STA) &&
 2166                     (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 2167                         continue;
 2168                 /*
 2169                  * Free fragments.
 2170                  * XXX doesn't belong here, move to node_drain
 2171                  */
 2172                 if (ni->ni_rxfrag[0] != NULL) {
 2173                         m_freem(ni->ni_rxfrag[0]);
 2174                         ni->ni_rxfrag[0] = NULL;
 2175                 }
 2176                 /*
 2177                  * Drain resources held by the station.
 2178                  */
 2179                 ic->ic_node_drain(ni);
 2180         }
 2181         IEEE80211_NODE_UNLOCK(nt);
 2182 }
 2183 
 2184 /*
 2185  * Per-ieee80211com inactivity timer callback.
 2186  */
 2187 void
 2188 ieee80211_node_timeout(void *arg)
 2189 {
 2190         struct ieee80211com *ic = arg;
 2191 
 2192         /*
 2193          * Defer timeout processing if a channel switch is pending.
 2194          * We typically need to be mute so not doing things that
 2195          * might generate frames is good to handle in one place.
 2196          * Supressing the station timeout processing may extend the
 2197          * lifetime of inactive stations (by not decrementing their
 2198          * idle counters) but this should be ok unless the CSA is
 2199          * active for an unusually long time.
 2200          */
 2201         if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
 2202                 ieee80211_scan_timeout(ic);
 2203                 ieee80211_timeout_stations(ic);
 2204                 ieee80211_ageq_age(&ic->ic_stageq, IEEE80211_INACT_WAIT);
 2205 
 2206                 IEEE80211_LOCK(ic);
 2207                 ieee80211_erp_timeout(ic);
 2208                 ieee80211_ht_timeout(ic);
 2209                 IEEE80211_UNLOCK(ic);
 2210         }
 2211         callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
 2212                 ieee80211_node_timeout, ic);
 2213 }
 2214 
 2215 /*
 2216  * Iterate over the node table and return an array of ref'ed nodes.
 2217  *
 2218  * This is separated out from calling the actual node function so that
 2219  * no LORs will occur.
 2220  *
 2221  * If there are too many nodes (ie, the number of nodes doesn't fit
 2222  * within 'max_aid' entries) then the node references will be freed
 2223  * and an error will be returned.
 2224  *
 2225  * The responsibility of allocating and freeing "ni_arr" is up to
 2226  * the caller.
 2227  */
 2228 int
 2229 ieee80211_iterate_nt(struct ieee80211_node_table *nt,
 2230     struct ieee80211_node **ni_arr, uint16_t max_aid)
 2231 {
 2232         u_int gen;
 2233         int i, j, ret;
 2234         struct ieee80211_node *ni;
 2235 
 2236         IEEE80211_NODE_ITERATE_LOCK(nt);
 2237         IEEE80211_NODE_LOCK(nt);
 2238 
 2239         gen = ++nt->nt_scangen;
 2240         i = ret = 0;
 2241 
 2242         /*
 2243          * We simply assume here that since the node
 2244          * scan generation doesn't change (as
 2245          * we are holding both the node table and
 2246          * node table iteration locks), we can simply
 2247          * assign it to the node here.
 2248          */
 2249         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 2250                 if (i >= max_aid) {
 2251                         ret = E2BIG;
 2252                         if_printf(nt->nt_ic->ic_ifp,
 2253                             "Node array overflow: max=%u", max_aid);
 2254                         break;
 2255                 }
 2256                 ni_arr[i] = ieee80211_ref_node(ni);
 2257                 ni_arr[i]->ni_scangen = gen;
 2258                 i++;
 2259         }
 2260 
 2261         /*
 2262          * It's safe to unlock here.
 2263          *
 2264          * If we're successful, the list is returned.
 2265          * If we're unsuccessful, the list is ignored
 2266          * and we remove our references.
 2267          *
 2268          * This avoids any potential LOR with
 2269          * ieee80211_free_node().
 2270          */
 2271         IEEE80211_NODE_UNLOCK(nt);
 2272         IEEE80211_NODE_ITERATE_UNLOCK(nt);
 2273 
 2274         /*
 2275          * If ret is non-zero, we hit some kind of error.
 2276          * Rather than walking some nodes, we'll walk none
 2277          * of them.
 2278          */
 2279         if (ret) {
 2280                 for (j = 0; j < i; j++) {
 2281                         /* ieee80211_free_node() locks by itself */
 2282                         ieee80211_free_node(ni_arr[j]);
 2283                 }
 2284         }
 2285 
 2286         return (ret);
 2287 }
 2288 
 2289 /*
 2290  * Just a wrapper, so we don't have to change every ieee80211_iterate_nodes()
 2291  * reference in the source.
 2292  *
 2293  * Note that this fetches 'max_aid' from the first VAP, rather than finding
 2294  * the largest max_aid from all VAPs.
 2295  */
 2296 void
 2297 ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
 2298         ieee80211_iter_func *f, void *arg)
 2299 {
 2300         struct ieee80211_node **ni_arr;
 2301         size_t size;
 2302         int i;
 2303         uint16_t max_aid;
 2304         struct ieee80211vap *vap;
 2305 
 2306         /* Overdoing it default */
 2307         max_aid = IEEE80211_AID_MAX;
 2308 
 2309         /* Handle the case of there being no vaps just yet */
 2310         vap = TAILQ_FIRST(&nt->nt_ic->ic_vaps);
 2311         if (vap != NULL)
 2312                 max_aid = vap->iv_max_aid;
 2313 
 2314         size = max_aid * sizeof(struct ieee80211_node *);
 2315         ni_arr = (struct ieee80211_node **) malloc(size, M_80211_NODE,
 2316             M_NOWAIT | M_ZERO);
 2317         if (ni_arr == NULL)
 2318                 return;
 2319 
 2320         /*
 2321          * If this fails, the node table won't have any
 2322          * valid entries - ieee80211_iterate_nt() frees
 2323          * the references to them.  So don't try walking
 2324          * the table; just skip to the end and free the
 2325          * temporary memory.
 2326          */
 2327         if (ieee80211_iterate_nt(nt, ni_arr, max_aid) != 0)
 2328                 goto done;
 2329 
 2330         for (i = 0; i < max_aid; i++) {
 2331                 if (ni_arr[i] == NULL)  /* end of the list */
 2332                         break;
 2333                 (*f)(arg, ni_arr[i]);
 2334                 /* ieee80211_free_node() locks by itself */
 2335                 ieee80211_free_node(ni_arr[i]);
 2336         }
 2337 
 2338 done:
 2339         free(ni_arr, M_80211_NODE);
 2340 }
 2341 
 2342 void
 2343 ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 2344 {
 2345         printf("0x%p: mac %s refcnt %d\n", ni,
 2346                 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
 2347         printf("\tscangen %u authmode %u flags 0x%x\n",
 2348                 ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
 2349         printf("\tassocid 0x%x txpower %u vlan %u\n",
 2350                 ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
 2351         printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
 2352                 ni->ni_txseqs[IEEE80211_NONQOS_TID],
 2353                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT,
 2354                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK,
 2355                 ni->ni_rxfragstamp);
 2356         printf("\trssi %d noise %d intval %u capinfo 0x%x\n",
 2357                 node_getrssi(ni), ni->ni_noise,
 2358                 ni->ni_intval, ni->ni_capinfo);
 2359         printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
 2360                 ether_sprintf(ni->ni_bssid),
 2361                 ni->ni_esslen, ni->ni_essid,
 2362                 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
 2363         printf("\tinact %u inact_reload %u txrate %u\n",
 2364                 ni->ni_inact, ni->ni_inact_reload, ni->ni_txrate);
 2365         printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n",
 2366                 ni->ni_htcap, ni->ni_htparam,
 2367                 ni->ni_htctlchan, ni->ni_ht2ndchan);
 2368         printf("\thtopmode %x htstbc %x chw %u\n",
 2369                 ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw);
 2370 }
 2371 
 2372 void
 2373 ieee80211_dump_nodes(struct ieee80211_node_table *nt)
 2374 {
 2375         ieee80211_iterate_nodes(nt,
 2376                 (ieee80211_iter_func *) ieee80211_dump_node, nt);
 2377 }
 2378 
 2379 static void
 2380 ieee80211_notify_erp_locked(struct ieee80211com *ic)
 2381 {
 2382         struct ieee80211vap *vap;
 2383 
 2384         IEEE80211_LOCK_ASSERT(ic);
 2385 
 2386         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 2387                 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
 2388                         ieee80211_beacon_notify(vap, IEEE80211_BEACON_ERP);
 2389 }
 2390 
 2391 void
 2392 ieee80211_notify_erp(struct ieee80211com *ic)
 2393 {
 2394         IEEE80211_LOCK(ic);
 2395         ieee80211_notify_erp_locked(ic);
 2396         IEEE80211_UNLOCK(ic);
 2397 }
 2398 
 2399 /*
 2400  * Handle a station joining an 11g network.
 2401  */
 2402 static void
 2403 ieee80211_node_join_11g(struct ieee80211_node *ni)
 2404 {
 2405         struct ieee80211com *ic = ni->ni_ic;
 2406 
 2407         IEEE80211_LOCK_ASSERT(ic);
 2408 
 2409         /*
 2410          * Station isn't capable of short slot time.  Bump
 2411          * the count of long slot time stations and disable
 2412          * use of short slot time.  Note that the actual switch
 2413          * over to long slot time use may not occur until the
 2414          * next beacon transmission (per sec. 7.3.1.4 of 11g).
 2415          */
 2416         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 2417                 ic->ic_longslotsta++;
 2418                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2419                     "station needs long slot time, count %d",
 2420                     ic->ic_longslotsta);
 2421                 /* XXX vap's w/ conflicting needs won't work */
 2422                 if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
 2423                         /*
 2424                          * Don't force slot time when switched to turbo
 2425                          * mode as non-ERP stations won't be present; this
 2426                          * need only be done when on the normal G channel.
 2427                          */
 2428                         ieee80211_set_shortslottime(ic, 0);
 2429                 }
 2430         }
 2431         /*
 2432          * If the new station is not an ERP station
 2433          * then bump the counter and enable protection
 2434          * if configured.
 2435          */
 2436         if (!ieee80211_iserp_rateset(&ni->ni_rates)) {
 2437                 ic->ic_nonerpsta++;
 2438                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2439                     "station is !ERP, %d non-ERP stations associated",
 2440                     ic->ic_nonerpsta);
 2441                 /*
 2442                  * If station does not support short preamble
 2443                  * then we must enable use of Barker preamble.
 2444                  */
 2445                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
 2446                         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2447                             "%s", "station needs long preamble");
 2448                         ic->ic_flags |= IEEE80211_F_USEBARKER;
 2449                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
 2450                 }
 2451                 /*
 2452                  * If protection is configured and this is the first
 2453                  * indication we should use protection, enable it.
 2454                  */
 2455                 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
 2456                     ic->ic_nonerpsta == 1 &&
 2457                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 2458                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
 2459                             "%s: enable use of protection\n", __func__);
 2460                         ic->ic_flags |= IEEE80211_F_USEPROT;
 2461                         ieee80211_notify_erp_locked(ic);
 2462                 }
 2463         } else
 2464                 ni->ni_flags |= IEEE80211_NODE_ERP;
 2465 }
 2466 
 2467 void
 2468 ieee80211_node_join(struct ieee80211_node *ni, int resp)
 2469 {
 2470         struct ieee80211com *ic = ni->ni_ic;
 2471         struct ieee80211vap *vap = ni->ni_vap;
 2472         int newassoc;
 2473 
 2474         if (ni->ni_associd == 0) {
 2475                 uint16_t aid;
 2476 
 2477                 KASSERT(vap->iv_aid_bitmap != NULL, ("no aid bitmap"));
 2478                 /*
 2479                  * It would be good to search the bitmap
 2480                  * more efficiently, but this will do for now.
 2481                  */
 2482                 for (aid = 1; aid < vap->iv_max_aid; aid++) {
 2483                         if (!IEEE80211_AID_ISSET(vap, aid))
 2484                                 break;
 2485                 }
 2486                 if (aid >= vap->iv_max_aid) {
 2487                         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_TOOMANY);
 2488                         ieee80211_node_leave(ni);
 2489                         return;
 2490                 }
 2491                 ni->ni_associd = aid | 0xc000;
 2492                 ni->ni_jointime = time_uptime;
 2493                 IEEE80211_LOCK(ic);
 2494                 IEEE80211_AID_SET(vap, ni->ni_associd);
 2495                 vap->iv_sta_assoc++;
 2496                 ic->ic_sta_assoc++;
 2497 
 2498                 if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 2499                         ieee80211_ht_node_join(ni);
 2500                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2501                     IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 2502                         ieee80211_node_join_11g(ni);
 2503                 IEEE80211_UNLOCK(ic);
 2504 
 2505                 newassoc = 1;
 2506         } else
 2507                 newassoc = 0;
 2508 
 2509         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 2510             "station associated at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
 2511             IEEE80211_NODE_AID(ni),
 2512             ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
 2513             ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
 2514             ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
 2515             ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
 2516             ni->ni_flags & IEEE80211_NODE_HT ?
 2517                 (ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
 2518             ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
 2519             ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
 2520                 ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
 2521             ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
 2522             IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
 2523                 ", fast-frames" : "",
 2524             IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
 2525                 ", turbo" : ""
 2526         );
 2527 
 2528         ieee80211_node_setuptxparms(ni);
 2529         ieee80211_ratectl_node_init(ni);
 2530         /* give driver a chance to setup state like ni_txrate */
 2531         if (ic->ic_newassoc != NULL)
 2532                 ic->ic_newassoc(ni, newassoc);
 2533         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_SUCCESS);
 2534         /* tell the authenticator about new station */
 2535         if (vap->iv_auth->ia_node_join != NULL)
 2536                 vap->iv_auth->ia_node_join(ni);
 2537         ieee80211_notify_node_join(ni,
 2538             resp == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 2539 }
 2540 
 2541 static void
 2542 disable_protection(struct ieee80211com *ic)
 2543 {
 2544         KASSERT(ic->ic_nonerpsta == 0 &&
 2545             (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0,
 2546            ("%d non ERP stations, flags 0x%x", ic->ic_nonerpsta,
 2547            ic->ic_flags_ext));
 2548 
 2549         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 2550         /* XXX verify mode? */
 2551         if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
 2552                 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
 2553                 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
 2554         }
 2555         ieee80211_notify_erp_locked(ic);
 2556 }
 2557 
 2558 /*
 2559  * Handle a station leaving an 11g network.
 2560  */
 2561 static void
 2562 ieee80211_node_leave_11g(struct ieee80211_node *ni)
 2563 {
 2564         struct ieee80211com *ic = ni->ni_ic;
 2565 
 2566         IEEE80211_LOCK_ASSERT(ic);
 2567 
 2568         KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
 2569              ("not in 11g, bss %u:0x%x", ic->ic_bsschan->ic_freq,
 2570               ic->ic_bsschan->ic_flags));
 2571 
 2572         /*
 2573          * If a long slot station do the slot time bookkeeping.
 2574          */
 2575         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 2576                 KASSERT(ic->ic_longslotsta > 0,
 2577                     ("bogus long slot station count %d", ic->ic_longslotsta));
 2578                 ic->ic_longslotsta--;
 2579                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2580                     "long slot time station leaves, count now %d",
 2581                     ic->ic_longslotsta);
 2582                 if (ic->ic_longslotsta == 0) {
 2583                         /*
 2584                          * Re-enable use of short slot time if supported
 2585                          * and not operating in IBSS mode (per spec).
 2586                          */
 2587                         if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
 2588                             ic->ic_opmode != IEEE80211_M_IBSS) {
 2589                                 IEEE80211_DPRINTF(ni->ni_vap,
 2590                                     IEEE80211_MSG_ASSOC,
 2591                                     "%s: re-enable use of short slot time\n",
 2592                                     __func__);
 2593                                 ieee80211_set_shortslottime(ic, 1);
 2594                         }
 2595                 }
 2596         }
 2597         /*
 2598          * If a non-ERP station do the protection-related bookkeeping.
 2599          */
 2600         if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
 2601                 KASSERT(ic->ic_nonerpsta > 0,
 2602                     ("bogus non-ERP station count %d", ic->ic_nonerpsta));
 2603                 ic->ic_nonerpsta--;
 2604                 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
 2605                     "non-ERP station leaves, count now %d%s", ic->ic_nonerpsta,
 2606                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) ?
 2607                         " (non-ERP sta present)" : "");
 2608                 if (ic->ic_nonerpsta == 0 &&
 2609                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 2610                         IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
 2611                                 "%s: disable use of protection\n", __func__);
 2612                         disable_protection(ic);
 2613                 }
 2614         }
 2615 }
 2616 
 2617 /*
 2618  * Time out presence of an overlapping bss with non-ERP
 2619  * stations.  When operating in hostap mode we listen for
 2620  * beacons from other stations and if we identify a non-ERP
 2621  * station is present we enable protection.  To identify
 2622  * when all non-ERP stations are gone we time out this
 2623  * condition.
 2624  */
 2625 static void
 2626 ieee80211_erp_timeout(struct ieee80211com *ic)
 2627 {
 2628 
 2629         IEEE80211_LOCK_ASSERT(ic);
 2630 
 2631         if ((ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) &&
 2632             time_after(ticks, ic->ic_lastnonerp + IEEE80211_NONERP_PRESENT_AGE)) {
 2633 #if 0
 2634                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 2635                     "%s", "age out non-ERP sta present on channel");
 2636 #endif
 2637                 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 2638                 if (ic->ic_nonerpsta == 0)
 2639                         disable_protection(ic);
 2640         }
 2641 }
 2642 
 2643 /*
 2644  * Handle bookkeeping for station deauthentication/disassociation
 2645  * when operating as an ap.
 2646  */
 2647 void
 2648 ieee80211_node_leave(struct ieee80211_node *ni)
 2649 {
 2650         struct ieee80211com *ic = ni->ni_ic;
 2651         struct ieee80211vap *vap = ni->ni_vap;
 2652         struct ieee80211_node_table *nt = ni->ni_table;
 2653 
 2654         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 2655             "station with aid %d leaves", IEEE80211_NODE_AID(ni));
 2656 
 2657         KASSERT(vap->iv_opmode != IEEE80211_M_STA,
 2658                 ("unexpected operating mode %u", vap->iv_opmode));
 2659         /*
 2660          * If node wasn't previously associated all
 2661          * we need to do is reclaim the reference.
 2662          */
 2663         /* XXX ibss mode bypasses 11g and notification */
 2664         if (ni->ni_associd == 0)
 2665                 goto done;
 2666         /*
 2667          * Tell the authenticator the station is leaving.
 2668          * Note that we must do this before yanking the
 2669          * association id as the authenticator uses the
 2670          * associd to locate it's state block.
 2671          */
 2672         if (vap->iv_auth->ia_node_leave != NULL)
 2673                 vap->iv_auth->ia_node_leave(ni);
 2674 
 2675         IEEE80211_LOCK(ic);
 2676         IEEE80211_AID_CLR(vap, ni->ni_associd);
 2677         ni->ni_associd = 0;
 2678         vap->iv_sta_assoc--;
 2679         ic->ic_sta_assoc--;
 2680 
 2681         if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 2682                 ieee80211_ht_node_leave(ni);
 2683         if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2684             IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 2685                 ieee80211_node_leave_11g(ni);
 2686         IEEE80211_UNLOCK(ic);
 2687         /*
 2688          * Cleanup station state.  In particular clear various
 2689          * state that might otherwise be reused if the node
 2690          * is reused before the reference count goes to zero
 2691          * (and memory is reclaimed).
 2692          */
 2693         ieee80211_sta_leave(ni);
 2694 done:
 2695         /*
 2696          * Remove the node from any table it's recorded in and
 2697          * drop the caller's reference.  Removal from the table
 2698          * is important to insure the node is not reprocessed
 2699          * for inactivity.
 2700          */
 2701         if (nt != NULL) {
 2702                 IEEE80211_NODE_LOCK(nt);
 2703                 node_reclaim(nt, ni);
 2704                 IEEE80211_NODE_UNLOCK(nt);
 2705         } else
 2706                 ieee80211_free_node(ni);
 2707 }
 2708 
 2709 struct rssiinfo {
 2710         struct ieee80211vap *vap;
 2711         int     rssi_samples;
 2712         uint32_t rssi_total;
 2713 };
 2714 
 2715 static void
 2716 get_hostap_rssi(void *arg, struct ieee80211_node *ni)
 2717 {
 2718         struct rssiinfo *info = arg;
 2719         struct ieee80211vap *vap = ni->ni_vap;
 2720         int8_t rssi;
 2721 
 2722         if (info->vap != vap)
 2723                 return;
 2724         /* only associated stations */
 2725         if (ni->ni_associd == 0)
 2726                 return;
 2727         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2728         if (rssi != 0) {
 2729                 info->rssi_samples++;
 2730                 info->rssi_total += rssi;
 2731         }
 2732 }
 2733 
 2734 static void
 2735 get_adhoc_rssi(void *arg, struct ieee80211_node *ni)
 2736 {
 2737         struct rssiinfo *info = arg;
 2738         struct ieee80211vap *vap = ni->ni_vap;
 2739         int8_t rssi;
 2740 
 2741         if (info->vap != vap)
 2742                 return;
 2743         /* only neighbors */
 2744         /* XXX check bssid */
 2745         if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
 2746                 return;
 2747         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2748         if (rssi != 0) {
 2749                 info->rssi_samples++;
 2750                 info->rssi_total += rssi;
 2751         }
 2752 }
 2753 
 2754 #ifdef IEEE80211_SUPPORT_MESH
 2755 static void
 2756 get_mesh_rssi(void *arg, struct ieee80211_node *ni)
 2757 {
 2758         struct rssiinfo *info = arg;
 2759         struct ieee80211vap *vap = ni->ni_vap;
 2760         int8_t rssi;
 2761 
 2762         if (info->vap != vap)
 2763                 return;
 2764         /* only neighbors that peered successfully */
 2765         if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
 2766                 return;
 2767         rssi = vap->iv_ic->ic_node_getrssi(ni);
 2768         if (rssi != 0) {
 2769                 info->rssi_samples++;
 2770                 info->rssi_total += rssi;
 2771         }
 2772 }
 2773 #endif /* IEEE80211_SUPPORT_MESH */
 2774 
 2775 int8_t
 2776 ieee80211_getrssi(struct ieee80211vap *vap)
 2777 {
 2778 #define NZ(x)   ((x) == 0 ? 1 : (x))
 2779         struct ieee80211com *ic = vap->iv_ic;
 2780         struct rssiinfo info;
 2781 
 2782         info.rssi_total = 0;
 2783         info.rssi_samples = 0;
 2784         info.vap = vap;
 2785         switch (vap->iv_opmode) {
 2786         case IEEE80211_M_IBSS:          /* average of all ibss neighbors */
 2787         case IEEE80211_M_AHDEMO:        /* average of all neighbors */
 2788                 ieee80211_iterate_nodes(&ic->ic_sta, get_adhoc_rssi, &info);
 2789                 break;
 2790         case IEEE80211_M_HOSTAP:        /* average of all associated stations */
 2791                 ieee80211_iterate_nodes(&ic->ic_sta, get_hostap_rssi, &info);
 2792                 break;
 2793 #ifdef IEEE80211_SUPPORT_MESH
 2794         case IEEE80211_M_MBSS:          /* average of all mesh neighbors */
 2795                 ieee80211_iterate_nodes(&ic->ic_sta, get_mesh_rssi, &info);
 2796                 break;
 2797 #endif
 2798         case IEEE80211_M_MONITOR:       /* XXX */
 2799         case IEEE80211_M_STA:           /* use stats from associated ap */
 2800         default:
 2801                 if (vap->iv_bss != NULL)
 2802                         info.rssi_total = ic->ic_node_getrssi(vap->iv_bss);
 2803                 info.rssi_samples = 1;
 2804                 break;
 2805         }
 2806         return info.rssi_total / NZ(info.rssi_samples);
 2807 #undef NZ
 2808 }
 2809 
 2810 void
 2811 ieee80211_getsignal(struct ieee80211vap *vap, int8_t *rssi, int8_t *noise)
 2812 {
 2813 
 2814         if (vap->iv_bss == NULL)                /* NB: shouldn't happen */
 2815                 return;
 2816         vap->iv_ic->ic_node_getsignal(vap->iv_bss, rssi, noise);
 2817         /* for non-station mode return avg'd rssi accounting */
 2818         if (vap->iv_opmode != IEEE80211_M_STA)
 2819                 *rssi = ieee80211_getrssi(vap);
 2820 }

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