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) 2002-2007 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/7.4/sys/net80211/ieee80211_node.c 215614 2010-11-21 10:52:47Z bschmidt $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h> 
   32 #include <sys/mbuf.h>   
   33 #include <sys/malloc.h>
   34 #include <sys/kernel.h>
   35 
   36 #include <sys/socket.h>
   37  
   38 #include <net/if.h>
   39 #include <net/if_media.h>
   40 #include <net/ethernet.h>
   41 
   42 #include <net80211/ieee80211_var.h>
   43 #include <net80211/ieee80211_input.h>
   44 
   45 #include <net/bpf.h>
   46 
   47 /*
   48  * Association id's are managed with a bit vector.
   49  */
   50 #define IEEE80211_AID_SET(b, w) \
   51         ((w)[IEEE80211_AID(b) / 32] |= (1 << (IEEE80211_AID(b) % 32)))
   52 #define IEEE80211_AID_CLR(b, w) \
   53         ((w)[IEEE80211_AID(b) / 32] &= ~(1 << (IEEE80211_AID(b) % 32)))
   54 #define IEEE80211_AID_ISSET(b, w) \
   55         ((w)[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32)))
   56 
   57 #ifdef IEEE80211_DEBUG_REFCNT
   58 #define REFCNT_LOC "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line
   59 #else
   60 #define REFCNT_LOC "%s %p<%s> refcnt %d\n", __func__
   61 #endif
   62 
   63 static int ieee80211_sta_join1(struct ieee80211_node *);
   64 
   65 static struct ieee80211_node *node_alloc(struct ieee80211_node_table *);
   66 static void node_cleanup(struct ieee80211_node *);
   67 static void node_free(struct ieee80211_node *);
   68 static int8_t node_getrssi(const struct ieee80211_node *);
   69 static void node_getsignal(const struct ieee80211_node *, int8_t *, int8_t *);
   70 
   71 static void ieee80211_setup_node(struct ieee80211_node_table *,
   72                 struct ieee80211_node *, const uint8_t *);
   73 static void _ieee80211_free_node(struct ieee80211_node *);
   74 
   75 static void ieee80211_node_table_init(struct ieee80211com *ic,
   76         struct ieee80211_node_table *nt, const char *name,
   77         int inact, int keymaxix);
   78 static void ieee80211_node_table_reset(struct ieee80211_node_table *);
   79 static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt);
   80 static void ieee80211_erp_timeout(struct ieee80211com *);
   81 
   82 MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
   83 MALLOC_DEFINE(M_80211_NODE_IE, "80211nodeie", "802.11 node ie");
   84 
   85 void
   86 ieee80211_node_attach(struct ieee80211com *ic)
   87 {
   88 
   89         ic->ic_node_alloc = node_alloc;
   90         ic->ic_node_free = node_free;
   91         ic->ic_node_cleanup = node_cleanup;
   92         ic->ic_node_getrssi = node_getrssi;
   93         ic->ic_node_getsignal = node_getsignal;
   94 
   95         /* default station inactivity timer setings */
   96         ic->ic_inact_init = IEEE80211_INACT_INIT;
   97         ic->ic_inact_auth = IEEE80211_INACT_AUTH;
   98         ic->ic_inact_run = IEEE80211_INACT_RUN;
   99         ic->ic_inact_probe = IEEE80211_INACT_PROBE;
  100 
  101         callout_init(&ic->ic_inact, CALLOUT_MPSAFE);
  102 
  103         /* NB: driver should override */
  104         ic->ic_max_aid = IEEE80211_AID_DEF;
  105 
  106         ic->ic_flags_ext |= IEEE80211_FEXT_INACT; /* inactivity processing */
  107 }
  108 
  109 void
  110 ieee80211_node_lateattach(struct ieee80211com *ic)
  111 {
  112         struct ieee80211_rsnparms *rsn;
  113 
  114         if (ic->ic_max_aid > IEEE80211_AID_MAX)
  115                 ic->ic_max_aid = IEEE80211_AID_MAX;
  116         MALLOC(ic->ic_aid_bitmap, uint32_t *,
  117                 howmany(ic->ic_max_aid, 32) * sizeof(uint32_t),
  118                 M_80211_NODE, M_NOWAIT | M_ZERO);
  119         if (ic->ic_aid_bitmap == NULL) {
  120                 /* XXX no way to recover */
  121                 printf("%s: no memory for AID bitmap!\n", __func__);
  122                 ic->ic_max_aid = 0;
  123         }
  124 
  125         ieee80211_node_table_init(ic, &ic->ic_sta, "station",
  126                 IEEE80211_INACT_INIT, ic->ic_crypto.cs_max_keyix);
  127 
  128         ieee80211_reset_bss(ic);
  129         /*
  130          * Setup "global settings" in the bss node so that
  131          * each new station automatically inherits them.
  132          */
  133         rsn = &ic->ic_bss->ni_rsn;
  134         /* WEP, TKIP, and AES-CCM are always supported */
  135         rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_WEP;
  136         rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_TKIP;
  137         rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_CCM;
  138         if (ic->ic_caps & IEEE80211_C_AES)
  139                 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_OCB;
  140         if (ic->ic_caps & IEEE80211_C_CKIP)
  141                 rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_CKIP;
  142         /*
  143          * Default unicast cipher to WEP for 802.1x use.  If
  144          * WPA is enabled the management code will set these
  145          * values to reflect.
  146          */
  147         rsn->rsn_ucastcipher = IEEE80211_CIPHER_WEP;
  148         rsn->rsn_ucastkeylen = 104 / NBBY;
  149         /*
  150          * WPA says the multicast cipher is the lowest unicast
  151          * cipher supported.  But we skip WEP which would
  152          * otherwise be used based on this criteria.
  153          */
  154         rsn->rsn_mcastcipher = IEEE80211_CIPHER_TKIP;
  155         rsn->rsn_mcastkeylen = 128 / NBBY;
  156 
  157         /*
  158          * We support both WPA-PSK and 802.1x; the one used
  159          * is determined by the authentication mode and the
  160          * setting of the PSK state.
  161          */
  162         rsn->rsn_keymgmtset = WPA_ASE_8021X_UNSPEC | WPA_ASE_8021X_PSK;
  163         rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
  164 
  165         ic->ic_auth = ieee80211_authenticator_get(ic->ic_bss->ni_authmode);
  166 }
  167 
  168 void
  169 ieee80211_node_detach(struct ieee80211com *ic)
  170 {
  171 
  172         if (ic->ic_bss != NULL) {
  173                 ieee80211_free_node(ic->ic_bss);
  174                 ic->ic_bss = NULL;
  175         }
  176         ieee80211_node_table_cleanup(&ic->ic_sta);
  177         if (ic->ic_aid_bitmap != NULL) {
  178                 FREE(ic->ic_aid_bitmap, M_80211_NODE);
  179                 ic->ic_aid_bitmap = NULL;
  180         }
  181 }
  182 
  183 /* 
  184  * Port authorize/unauthorize interfaces for use by an authenticator.
  185  */
  186 
  187 void
  188 ieee80211_node_authorize(struct ieee80211_node *ni)
  189 {
  190         struct ieee80211com *ic = ni->ni_ic;
  191 
  192         ni->ni_flags |= IEEE80211_NODE_AUTH;
  193         ni->ni_inact_reload = ic->ic_inact_run;
  194         ni->ni_inact = ni->ni_inact_reload;
  195 }
  196 
  197 void
  198 ieee80211_node_unauthorize(struct ieee80211_node *ni)
  199 {
  200         struct ieee80211com *ic = ni->ni_ic;
  201 
  202         ni->ni_flags &= ~IEEE80211_NODE_AUTH;
  203         ni->ni_inact_reload = ic->ic_inact_auth;
  204         if (ni->ni_inact > ni->ni_inact_reload)
  205                 ni->ni_inact = ni->ni_inact_reload;
  206 }
  207 
  208 /*
  209  * Set/change the channel.  The rate set is also updated as
  210  * to insure a consistent view by drivers.
  211  */
  212 static void
  213 ieee80211_node_set_chan(struct ieee80211com *ic, struct ieee80211_node *ni)
  214 {
  215         struct ieee80211_channel *chan = ic->ic_bsschan;
  216 
  217 #if 0
  218         KASSERT(chan != IEEE80211_CHAN_ANYC, ("bss channel not setup"));
  219 #else
  220         if (chan == IEEE80211_CHAN_ANYC)        /* XXX while scanning */
  221                 chan = ic->ic_curchan;
  222 #endif
  223         ni->ni_chan = chan;
  224         if (IEEE80211_IS_CHAN_HT(chan)) {
  225                 /*
  226                  * XXX Gotta be careful here; the rate set returned by
  227                  * ieee80211_get_suprates is actually any HT rate
  228                  * set so blindly copying it will be bad.  We must
  229                  * install the legacy rate est in ni_rates and the
  230                  * HT rate set in ni_htrates.
  231                  */
  232                 ni->ni_htrates = *ieee80211_get_suphtrates(ic, chan);
  233         }
  234         ni->ni_rates = *ieee80211_get_suprates(ic, chan);
  235 }
  236 
  237 /*
  238  * Probe the curent channel, if allowed, while scanning.
  239  * If the channel is not marked passive-only then send
  240  * a probe request immediately.  Otherwise mark state and
  241  * listen for beacons on the channel; if we receive something
  242  * then we'll transmit a probe request.
  243  */
  244 void
  245 ieee80211_probe_curchan(struct ieee80211com *ic, int force)
  246 {
  247         struct ifnet *ifp = ic->ic_ifp;
  248 
  249         if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 || force) {
  250                 /*
  251                  * XXX send both broadcast+directed probe request
  252                  */
  253                 ieee80211_send_probereq(ic->ic_bss,
  254                         ic->ic_myaddr, ifp->if_broadcastaddr,
  255                         ifp->if_broadcastaddr,
  256                         ic->ic_des_ssid[0].ssid, ic->ic_des_ssid[0].len,
  257                         ic->ic_opt_ie, ic->ic_opt_ie_len);
  258         } else
  259                 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
  260 }
  261 
  262 static __inline void
  263 copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
  264 {
  265         /* propagate useful state */
  266         nbss->ni_authmode = obss->ni_authmode;
  267         nbss->ni_txpower = obss->ni_txpower;
  268         nbss->ni_vlan = obss->ni_vlan;
  269         nbss->ni_rsn = obss->ni_rsn;
  270         /* XXX statistics? */
  271 }
  272 
  273 void
  274 ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan)
  275 {
  276         struct ieee80211_node_table *nt;
  277         struct ieee80211_node *ni;
  278 
  279         IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
  280                 "%s: creating ibss\n", __func__);
  281 
  282         /*
  283          * Create the station/neighbor table.  Note that for adhoc
  284          * mode we make the initial inactivity timer longer since
  285          * we create nodes only through discovery and they typically
  286          * are long-lived associations.
  287          */
  288         nt = &ic->ic_sta;
  289         IEEE80211_NODE_LOCK(nt);
  290         if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
  291                 nt->nt_name = "station";
  292                 nt->nt_inact_init = ic->ic_inact_init;
  293         } else {
  294                 nt->nt_name = "neighbor";
  295                 nt->nt_inact_init = ic->ic_inact_run;
  296         }
  297         IEEE80211_NODE_UNLOCK(nt);
  298 
  299         ni = ieee80211_alloc_node(&ic->ic_sta, ic->ic_myaddr);
  300         if (ni == NULL) {
  301                 /* XXX recovery? */
  302                 return;
  303         }
  304         IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr);
  305         ni->ni_esslen = ic->ic_des_ssid[0].len;
  306         memcpy(ni->ni_essid, ic->ic_des_ssid[0].ssid, ni->ni_esslen);
  307         if (ic->ic_bss != NULL)
  308                 copy_bss(ni, ic->ic_bss);
  309         ni->ni_intval = ic->ic_bintval;
  310         if (ic->ic_flags & IEEE80211_F_PRIVACY)
  311                 ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
  312         if (ic->ic_phytype == IEEE80211_T_FH) {
  313                 ni->ni_fhdwell = 200;   /* XXX */
  314                 ni->ni_fhindex = 1;
  315         }
  316         if (ic->ic_opmode == IEEE80211_M_IBSS) {
  317                 ic->ic_flags |= IEEE80211_F_SIBSS;
  318                 ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS;       /* XXX */
  319                 if (ic->ic_flags & IEEE80211_F_DESBSSID)
  320                         IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid);
  321                 else {
  322                         get_random_bytes(ni->ni_bssid, IEEE80211_ADDR_LEN);
  323                         /* clear group bit, add local bit */
  324                         ni->ni_bssid[0] = (ni->ni_bssid[0] &~ 0x01) | 0x02;
  325                 }
  326         } else if (ic->ic_opmode == IEEE80211_M_AHDEMO) {
  327                 if (ic->ic_flags & IEEE80211_F_DESBSSID)
  328                         IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid);
  329                 else
  330                         memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN);
  331         }
  332         /* 
  333          * Fix the channel and related attributes.
  334          */
  335         ic->ic_bsschan = chan;
  336         ieee80211_node_set_chan(ic, ni);
  337         ic->ic_curmode = ieee80211_chan2mode(chan);
  338         /*
  339          * Do mode-specific rate setup.
  340          */
  341         if (IEEE80211_IS_CHAN_FULL(chan)) {
  342                 if (IEEE80211_IS_CHAN_ANYG(chan)) {
  343                         /*
  344                          * Use a mixed 11b/11g rate set.
  345                          */
  346                         ieee80211_set11gbasicrates(&ni->ni_rates,
  347                                 IEEE80211_MODE_11G);
  348                 } else if (IEEE80211_IS_CHAN_B(chan)) {
  349                         /*
  350                          * Force pure 11b rate set.
  351                          */
  352                         ieee80211_set11gbasicrates(&ni->ni_rates,
  353                                 IEEE80211_MODE_11B);
  354                 }
  355         }
  356 
  357         (void) ieee80211_sta_join1(ieee80211_ref_node(ni));
  358 }
  359 
  360 /*
  361  * Reset bss state on transition to the INIT state.
  362  * Clear any stations from the table (they have been
  363  * deauth'd) and reset the bss node (clears key, rate
  364  * etc. state).
  365  */
  366 void
  367 ieee80211_reset_bss(struct ieee80211com *ic)
  368 {
  369         struct ieee80211_node *ni, *obss;
  370 
  371         callout_drain(&ic->ic_inact);
  372         ieee80211_node_table_reset(&ic->ic_sta);
  373         ieee80211_reset_erp(ic);
  374 
  375         ni = ieee80211_alloc_node(&ic->ic_sta, ic->ic_myaddr);
  376         KASSERT(ni != NULL, ("unable to setup initial BSS node"));
  377         obss = ic->ic_bss;
  378         ic->ic_bss = ieee80211_ref_node(ni);
  379         if (obss != NULL) {
  380                 copy_bss(ni, obss);
  381                 ni->ni_intval = ic->ic_bintval;
  382                 ieee80211_free_node(obss);
  383         }
  384 }
  385 
  386 static int
  387 match_ssid(const struct ieee80211_node *ni,
  388         int nssid, const struct ieee80211_scan_ssid ssids[])
  389 {
  390         int i;
  391 
  392         for (i = 0; i < nssid; i++) {
  393                 if (ni->ni_esslen == ssids[i].len &&
  394                      memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0)
  395                         return 1;
  396         }
  397         return 0;
  398 }
  399 
  400 /*
  401  * Test a node for suitability/compatibility.
  402  */
  403 static int
  404 check_bss(struct ieee80211com *ic, struct ieee80211_node *ni)
  405 {
  406         uint8_t rate;
  407 
  408         if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
  409                 return 0;
  410         if (ic->ic_opmode == IEEE80211_M_IBSS) {
  411                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
  412                         return 0;
  413         } else {
  414                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
  415                         return 0;
  416         }
  417         if (ic->ic_flags & IEEE80211_F_PRIVACY) {
  418                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
  419                         return 0;
  420         } else {
  421                 /* XXX does this mean privacy is supported or required? */
  422                 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
  423                         return 0;
  424         }
  425         rate = ieee80211_fix_rate(ni, &ni->ni_rates,
  426             IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
  427         if (rate & IEEE80211_RATE_BASIC)
  428                 return 0;
  429         if (ic->ic_des_nssid != 0 &&
  430             !match_ssid(ni, ic->ic_des_nssid, ic->ic_des_ssid))
  431                 return 0;
  432         if ((ic->ic_flags & IEEE80211_F_DESBSSID) &&
  433             !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid))
  434                 return 0;
  435         return 1;
  436 }
  437 
  438 #ifdef IEEE80211_DEBUG
  439 /*
  440  * Display node suitability/compatibility.
  441  */
  442 static void
  443 check_bss_debug(struct ieee80211com *ic, struct ieee80211_node *ni)
  444 {
  445         uint8_t rate;
  446         int fail;
  447 
  448         fail = 0;
  449         if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
  450                 fail |= 0x01;
  451         if (ic->ic_opmode == IEEE80211_M_IBSS) {
  452                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
  453                         fail |= 0x02;
  454         } else {
  455                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
  456                         fail |= 0x02;
  457         }
  458         if (ic->ic_flags & IEEE80211_F_PRIVACY) {
  459                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
  460                         fail |= 0x04;
  461         } else {
  462                 /* XXX does this mean privacy is supported or required? */
  463                 if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
  464                         fail |= 0x04;
  465         }
  466         rate = ieee80211_fix_rate(ni, &ni->ni_rates,
  467              IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
  468         if (rate & IEEE80211_RATE_BASIC)
  469                 fail |= 0x08;
  470         if (ic->ic_des_nssid != 0 &&
  471             !match_ssid(ni, ic->ic_des_nssid, ic->ic_des_ssid))
  472                 fail |= 0x10;
  473         if ((ic->ic_flags & IEEE80211_F_DESBSSID) &&
  474             !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid))
  475                 fail |= 0x20;
  476 
  477         printf(" %c %s", fail ? '-' : '+', ether_sprintf(ni->ni_macaddr));
  478         printf(" %s%c", ether_sprintf(ni->ni_bssid), fail & 0x20 ? '!' : ' ');
  479         printf(" %3d%c",
  480             ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' ');
  481         printf(" %+4d", ni->ni_rssi);
  482         printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
  483             fail & 0x08 ? '!' : ' ');
  484         printf(" %4s%c",
  485             (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
  486             (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
  487             "????",
  488             fail & 0x02 ? '!' : ' ');
  489         printf(" %3s%c ",
  490             (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?  "wep" : "no",
  491             fail & 0x04 ? '!' : ' ');
  492         ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
  493         printf("%s\n", fail & 0x10 ? "!" : "");
  494 }
  495 #endif /* IEEE80211_DEBUG */
  496  
  497 /*
  498  * Handle 802.11 ad hoc network merge.  The
  499  * convention, set by the Wireless Ethernet Compatibility Alliance
  500  * (WECA), is that an 802.11 station will change its BSSID to match
  501  * the "oldest" 802.11 ad hoc network, on the same channel, that
  502  * has the station's desired SSID.  The "oldest" 802.11 network
  503  * sends beacons with the greatest TSF timestamp.
  504  *
  505  * The caller is assumed to validate TSF's before attempting a merge.
  506  *
  507  * Return !0 if the BSSID changed, 0 otherwise.
  508  */
  509 int
  510 ieee80211_ibss_merge(struct ieee80211_node *ni)
  511 {
  512         struct ieee80211com *ic = ni->ni_ic;
  513 
  514         if (ni == ic->ic_bss ||
  515             IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) {
  516                 /* unchanged, nothing to do */
  517                 return 0;
  518         }
  519         if (!check_bss(ic, ni)) {
  520                 /* capabilities mismatch */
  521                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
  522                     "%s: merge failed, capabilities mismatch\n", __func__);
  523 #ifdef IEEE80211_DEBUG
  524                 if (ieee80211_msg_assoc(ic))
  525                         check_bss_debug(ic, ni);
  526 #endif
  527                 ic->ic_stats.is_ibss_capmismatch++;
  528                 return 0;
  529         }
  530         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
  531                 "%s: new bssid %s: %s preamble, %s slot time%s\n", __func__,
  532                 ether_sprintf(ni->ni_bssid),
  533                 ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
  534                 ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
  535                 ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : ""
  536         );
  537         return ieee80211_sta_join1(ieee80211_ref_node(ni));
  538 }
  539 
  540 /*
  541  * Change the bss channel.
  542  */
  543 void
  544 ieee80211_setbsschan(struct ieee80211com *ic, struct ieee80211_channel *c)
  545 {
  546         ic->ic_bsschan = c;
  547         ic->ic_curchan = ic->ic_bsschan;
  548         ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
  549         ic->ic_set_channel(ic);
  550 }
  551 
  552 /*
  553  * Join the specified IBSS/BSS network.  The node is assumed to
  554  * be passed in with a held reference.
  555  */
  556 static int
  557 ieee80211_sta_join1(struct ieee80211_node *selbs)
  558 {
  559         struct ieee80211com *ic = selbs->ni_ic;
  560         struct ieee80211_node *obss;
  561         int canreassoc;
  562 
  563         if (ic->ic_opmode == IEEE80211_M_IBSS) {
  564                 struct ieee80211_node_table *nt;
  565                 /*
  566                  * Fillin the neighbor table; it will already
  567                  * exist if we are simply switching mastership.
  568                  * XXX ic_sta always setup so this is unnecessary?
  569                  */
  570                 nt = &ic->ic_sta;
  571                 IEEE80211_NODE_LOCK(nt);
  572                 nt->nt_name = "neighbor";
  573                 nt->nt_inact_init = ic->ic_inact_run;
  574                 IEEE80211_NODE_UNLOCK(nt);
  575         }
  576 
  577         /*
  578          * Committed to selbs, setup state.
  579          */
  580         obss = ic->ic_bss;
  581         /*
  582          * Check if old+new node have the same address in which
  583          * case we can reassociate when operating in sta mode.
  584          */
  585         canreassoc = (obss != NULL &&
  586                 ic->ic_state == IEEE80211_S_RUN &&
  587                 IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr));
  588         ic->ic_bss = selbs;             /* NB: caller assumed to bump refcnt */
  589         if (obss != NULL) {
  590                 copy_bss(selbs, obss);
  591                 ieee80211_free_node(obss);
  592         }
  593 
  594         /*
  595          * Delete unusable rates; we've already checked
  596          * that the negotiated rate set is acceptable.
  597          */
  598         ieee80211_fix_rate(ic->ic_bss, &ic->ic_bss->ni_rates,
  599                 IEEE80211_F_DODEL | IEEE80211_F_JOIN);
  600 
  601         ieee80211_setbsschan(ic, selbs->ni_chan);
  602         /*
  603          * Set the erp state (mostly the slot time) to deal with
  604          * the auto-select case; this should be redundant if the
  605          * mode is locked.
  606          */ 
  607         ieee80211_reset_erp(ic);
  608         ieee80211_wme_initparams(ic);
  609 
  610         if (ic->ic_opmode == IEEE80211_M_STA) {
  611                 if (canreassoc) {
  612                         /* Reassociate */
  613                         ieee80211_new_state(ic, IEEE80211_S_ASSOC, 1);
  614                 } else {
  615                         /*
  616                          * Act as if we received a DEAUTH frame in case we
  617                          * are invoked from the RUN state.  This will cause
  618                          * us to try to re-authenticate if we are operating
  619                          * as a station.
  620                          */
  621                         ieee80211_new_state(ic, IEEE80211_S_AUTH,
  622                                 IEEE80211_FC0_SUBTYPE_DEAUTH);
  623                 }
  624         } else
  625                 ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
  626         return 1;
  627 }
  628 
  629 int
  630 ieee80211_sta_join(struct ieee80211com *ic,
  631         const struct ieee80211_scan_entry *se)
  632 {
  633         struct ieee80211_node *ni;
  634 
  635         ni = ieee80211_alloc_node(&ic->ic_sta, se->se_macaddr);
  636         if (ni == NULL) {
  637                 /* XXX msg */
  638                 return 0;
  639         }
  640         /*
  641          * Expand scan state into node's format.
  642          * XXX may not need all this stuff
  643          */
  644         IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
  645         ni->ni_esslen = se->se_ssid[1];
  646         memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen);
  647         ni->ni_rstamp = se->se_rstamp;
  648         ni->ni_tstamp.tsf = se->se_tstamp.tsf;
  649         ni->ni_intval = se->se_intval;
  650         ni->ni_capinfo = se->se_capinfo;
  651         ni->ni_chan = se->se_chan;
  652         ni->ni_timoff = se->se_timoff;
  653         ni->ni_fhdwell = se->se_fhdwell;
  654         ni->ni_fhindex = se->se_fhindex;
  655         ni->ni_erp = se->se_erp;
  656         ni->ni_rssi = se->se_rssi;
  657         ni->ni_noise = se->se_noise;
  658 
  659         if (ieee80211_ies_init(&ni->ni_ies, se->se_ies.data, se->se_ies.len)) {
  660                 ieee80211_ies_expand(&ni->ni_ies);
  661                 if (ni->ni_ies.ath_ie != NULL)
  662                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
  663                 if (ni->ni_ies.htcap_ie != NULL)
  664                         ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
  665                 if (ni->ni_ies.htinfo_ie != NULL)
  666                         ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
  667         }
  668 
  669         ic->ic_dtim_period = se->se_dtimperiod;
  670         ic->ic_dtim_count = 0;
  671 
  672         /* NB: must be after ni_chan is setup */
  673         ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
  674                 IEEE80211_F_DOSORT);
  675 
  676         return ieee80211_sta_join1(ieee80211_ref_node(ni));
  677 }
  678 
  679 /*
  680  * Leave the specified IBSS/BSS network.  The node is assumed to
  681  * be passed in with a held reference.
  682  */
  683 void
  684 ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
  685 {
  686         ic->ic_node_cleanup(ni);
  687         ieee80211_notify_node_leave(ic, ni);
  688 }
  689 
  690 static struct ieee80211_node *
  691 node_alloc(struct ieee80211_node_table *nt)
  692 {
  693         struct ieee80211_node *ni;
  694 
  695         MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node),
  696                 M_80211_NODE, M_NOWAIT | M_ZERO);
  697         return ni;
  698 }
  699 
  700 /*
  701  * Initialize an ie blob with the specified data.  If previous
  702  * data exists re-use the data block.  As a side effect we clear
  703  * all references to specific ie's; the caller is required to
  704  * recalculate them.
  705  */
  706 int
  707 ieee80211_ies_init(struct ieee80211_ies *ies, const uint8_t *data, int len)
  708 {
  709         /* NB: assumes data+len are the last fields */
  710         memset(ies, 0, offsetof(struct ieee80211_ies, data));
  711         if (ies->data != NULL && ies->len != len) {
  712                 /* data size changed */
  713                 FREE(ies->data, M_80211_NODE_IE);
  714                 ies->data = NULL;
  715         }
  716         if (ies->data == NULL) {
  717                 MALLOC(ies->data, uint8_t *, len, M_80211_NODE_IE, M_NOWAIT);
  718                 if (ies->data == NULL) {
  719                         ies->len = 0;
  720                         /* NB: pointers have already been zero'd above */
  721                         return 0;
  722                 }
  723         }
  724         memcpy(ies->data, data, len);
  725         ies->len = len;
  726         return 1;
  727 }
  728 
  729 /*
  730  * Reclaim storage for an ie blob.
  731  */
  732 void
  733 ieee80211_ies_cleanup(struct ieee80211_ies *ies)
  734 {
  735         if (ies->data != NULL)
  736                 FREE(ies->data, M_80211_NODE_IE);
  737 }
  738 
  739 /*
  740  * Expand an ie blob data contents and to fillin individual
  741  * ie pointers.  The data blob is assumed to be well-formed;
  742  * we don't do any validity checking of ie lengths.
  743  */
  744 void
  745 ieee80211_ies_expand(struct ieee80211_ies *ies)
  746 {
  747         uint8_t *ie;
  748         int ielen;
  749 
  750         ie = ies->data;
  751         ielen = ies->len;
  752         while (ielen > 0) {
  753                 switch (ie[0]) {
  754                 case IEEE80211_ELEMID_VENDOR:
  755                         if (iswpaoui(ie))
  756                                 ies->wpa_ie = ie;
  757                         else if (iswmeoui(ie))
  758                                 ies->wme_ie = ie;
  759                         else if (isatherosoui(ie))
  760                                 ies->ath_ie = ie;
  761                         break;
  762                 case IEEE80211_ELEMID_RSN:
  763                         ies->rsn_ie = ie;
  764                         break;
  765                 case IEEE80211_ELEMID_HTCAP:
  766                         ies->htcap_ie = ie;
  767                         break;
  768                 }
  769                 ielen -= 2 + ie[1];
  770                 ie += 2 + ie[1];
  771         }
  772 }
  773 
  774 /*
  775  * Reclaim any resources in a node and reset any critical
  776  * state.  Typically nodes are free'd immediately after,
  777  * but in some cases the storage may be reused so we need
  778  * to insure consistent state (should probably fix that).
  779  */
  780 static void
  781 node_cleanup(struct ieee80211_node *ni)
  782 {
  783 #define N(a)    (sizeof(a)/sizeof(a[0]))
  784         struct ieee80211com *ic = ni->ni_ic;
  785         int i;
  786 
  787         /* NB: preserve ni_table */
  788         if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
  789                 if (ic->ic_opmode != IEEE80211_M_STA)
  790                         ic->ic_ps_sta--;
  791                 ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
  792                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
  793                     "[%s] power save mode off, %u sta's in ps mode\n",
  794                     ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta);
  795         }
  796         /*
  797          * Cleanup any HT-related state.
  798          */
  799         if (ni->ni_flags & IEEE80211_NODE_HT)
  800                 ieee80211_ht_node_cleanup(ni);
  801         /*
  802          * Clear AREF flag that marks the authorization refcnt bump
  803          * has happened.  This is probably not needed as the node
  804          * should always be removed from the table so not found but
  805          * do it just in case.
  806          */
  807         ni->ni_flags &= ~IEEE80211_NODE_AREF;
  808 
  809         /*
  810          * Drain power save queue and, if needed, clear TIM.
  811          */
  812         if (ieee80211_node_saveq_drain(ni) != 0 && ic->ic_set_tim != NULL)
  813                 ic->ic_set_tim(ni, 0);
  814 
  815         ni->ni_associd = 0;
  816         if (ni->ni_challenge != NULL) {
  817                 FREE(ni->ni_challenge, M_80211_NODE);
  818                 ni->ni_challenge = NULL;
  819         }
  820         /*
  821          * Preserve SSID, WPA, and WME ie's so the bss node is
  822          * reusable during a re-auth/re-assoc state transition.
  823          * If we remove these data they will not be recreated
  824          * because they come from a probe-response or beacon frame
  825          * which cannot be expected prior to the association-response.
  826          * This should not be an issue when operating in other modes
  827          * as stations leaving always go through a full state transition
  828          * which will rebuild this state.
  829          *
  830          * XXX does this leave us open to inheriting old state?
  831          */
  832         for (i = 0; i < N(ni->ni_rxfrag); i++)
  833                 if (ni->ni_rxfrag[i] != NULL) {
  834                         m_freem(ni->ni_rxfrag[i]);
  835                         ni->ni_rxfrag[i] = NULL;
  836                 }
  837         /*
  838          * Must be careful here to remove any key map entry w/o a LOR.
  839          */
  840         ieee80211_node_delucastkey(ni);
  841 #undef N
  842 }
  843 
  844 static void
  845 node_free(struct ieee80211_node *ni)
  846 {
  847         struct ieee80211com *ic = ni->ni_ic;
  848 
  849         ic->ic_node_cleanup(ni);
  850         ieee80211_ies_cleanup(&ni->ni_ies);
  851         IEEE80211_NODE_SAVEQ_DESTROY(ni);
  852         FREE(ni, M_80211_NODE);
  853 }
  854 
  855 static int8_t
  856 node_getrssi(const struct ieee80211_node *ni)
  857 {
  858         return ni->ni_rssi;
  859 }
  860 
  861 static void
  862 node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise)
  863 {
  864         *rssi = ni->ni_rssi;
  865         *noise = ni->ni_noise;
  866 }
  867 
  868 static void
  869 ieee80211_setup_node(struct ieee80211_node_table *nt,
  870         struct ieee80211_node *ni, const uint8_t *macaddr)
  871 {
  872         struct ieee80211com *ic = nt->nt_ic;
  873         int hash;
  874 
  875         IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
  876                 "%s %p<%s> in %s table\n", __func__, ni,
  877                 ether_sprintf(macaddr), nt->nt_name);
  878 
  879         IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
  880         hash = IEEE80211_NODE_HASH(macaddr);
  881         ieee80211_node_initref(ni);             /* mark referenced */
  882         ni->ni_chan = IEEE80211_CHAN_ANYC;
  883         ni->ni_authmode = IEEE80211_AUTH_OPEN;
  884         ni->ni_txpower = ic->ic_txpowlimit;     /* max power */
  885         ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
  886         ni->ni_inact_reload = nt->nt_inact_init;
  887         ni->ni_inact = ni->ni_inact_reload;
  888         ni->ni_ath_defkeyix = 0x7fff;
  889         IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
  890 
  891         IEEE80211_NODE_LOCK(nt);
  892         TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
  893         LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
  894         ni->ni_table = nt;
  895         ni->ni_ic = ic;
  896         IEEE80211_NODE_UNLOCK(nt);
  897 }
  898 
  899 struct ieee80211_node *
  900 ieee80211_alloc_node(struct ieee80211_node_table *nt, const uint8_t *macaddr)
  901 {
  902         struct ieee80211com *ic = nt->nt_ic;
  903         struct ieee80211_node *ni;
  904 
  905         ni = ic->ic_node_alloc(nt);
  906         if (ni != NULL)
  907                 ieee80211_setup_node(nt, ni, macaddr);
  908         else
  909                 ic->ic_stats.is_rx_nodealloc++;
  910         return ni;
  911 }
  912 
  913 /*
  914  * Craft a temporary node suitable for sending a management frame
  915  * to the specified station.  We craft only as much state as we
  916  * need to do the work since the node will be immediately reclaimed
  917  * once the send completes.
  918  */
  919 struct ieee80211_node *
  920 ieee80211_tmp_node(struct ieee80211com *ic, const uint8_t *macaddr)
  921 {
  922         struct ieee80211_node *ni;
  923 
  924         ni = ic->ic_node_alloc(&ic->ic_sta);
  925         if (ni != NULL) {
  926                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
  927                         "%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
  928 
  929                 IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
  930                 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
  931                 ieee80211_node_initref(ni);             /* mark referenced */
  932                 ni->ni_txpower = ic->ic_bss->ni_txpower;
  933                 /* NB: required by ieee80211_fix_rate */
  934                 ieee80211_node_set_chan(ic, ni);
  935                 ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey,
  936                         IEEE80211_KEYIX_NONE);
  937                 /* XXX optimize away */
  938                 IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
  939 
  940                 ni->ni_table = NULL;            /* NB: pedantic */
  941                 ni->ni_ic = ic;
  942         } else {
  943                 /* XXX msg */
  944                 ic->ic_stats.is_rx_nodealloc++;
  945         }
  946         return ni;
  947 }
  948 
  949 struct ieee80211_node *
  950 ieee80211_dup_bss(struct ieee80211_node_table *nt, const uint8_t *macaddr)
  951 {
  952         struct ieee80211com *ic = nt->nt_ic;
  953         struct ieee80211_node *ni;
  954 
  955         ni = ic->ic_node_alloc(nt);
  956         if (ni != NULL) {
  957                 ieee80211_setup_node(nt, ni, macaddr);
  958                 /*
  959                  * Inherit from ic_bss.
  960                  */
  961                 ni->ni_authmode = ic->ic_bss->ni_authmode;
  962                 ni->ni_txpower = ic->ic_bss->ni_txpower;
  963                 ni->ni_vlan = ic->ic_bss->ni_vlan;      /* XXX?? */
  964                 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
  965                 ieee80211_node_set_chan(ic, ni);
  966                 ni->ni_rsn = ic->ic_bss->ni_rsn;
  967         } else
  968                 ic->ic_stats.is_rx_nodealloc++;
  969         return ni;
  970 }
  971 
  972 static struct ieee80211_node *
  973 #ifdef IEEE80211_DEBUG_REFCNT
  974 _ieee80211_find_node_debug(struct ieee80211_node_table *nt,
  975         const uint8_t *macaddr, const char *func, int line)
  976 #else
  977 _ieee80211_find_node(struct ieee80211_node_table *nt,
  978         const uint8_t *macaddr)
  979 #endif
  980 {
  981         struct ieee80211_node *ni;
  982         int hash;
  983 
  984         IEEE80211_NODE_LOCK_ASSERT(nt);
  985 
  986         hash = IEEE80211_NODE_HASH(macaddr);
  987         LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
  988                 if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
  989                         ieee80211_ref_node(ni); /* mark referenced */
  990 #ifdef IEEE80211_DEBUG_REFCNT
  991                         IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
  992                             "%s (%s:%u) %p<%s> refcnt %d\n", __func__,
  993                             func, line,
  994                             ni, ether_sprintf(ni->ni_macaddr),
  995                             ieee80211_node_refcnt(ni));
  996 #endif
  997                         return ni;
  998                 }
  999         }
 1000         return NULL;
 1001 }
 1002 #ifdef IEEE80211_DEBUG_REFCNT
 1003 #define _ieee80211_find_node(nt, mac) \
 1004         _ieee80211_find_node_debug(nt, mac, func, line)
 1005 #endif
 1006 
 1007 struct ieee80211_node *
 1008 #ifdef IEEE80211_DEBUG_REFCNT
 1009 ieee80211_find_node_debug(struct ieee80211_node_table *nt,
 1010         const uint8_t *macaddr, const char *func, int line)
 1011 #else
 1012 ieee80211_find_node(struct ieee80211_node_table *nt, const uint8_t *macaddr)
 1013 #endif
 1014 {
 1015         struct ieee80211_node *ni;
 1016 
 1017         IEEE80211_NODE_LOCK(nt);
 1018         ni = _ieee80211_find_node(nt, macaddr);
 1019         IEEE80211_NODE_UNLOCK(nt);
 1020         return ni;
 1021 }
 1022 
 1023 /*
 1024  * Fake up a node; this handles node discovery in adhoc mode.
 1025  * Note that for the driver's benefit we we treat this like
 1026  * an association so the driver has an opportunity to setup
 1027  * it's private state.
 1028  */
 1029 struct ieee80211_node *
 1030 ieee80211_fakeup_adhoc_node(struct ieee80211_node_table *nt,
 1031         const uint8_t macaddr[IEEE80211_ADDR_LEN])
 1032 {
 1033         struct ieee80211com *ic = nt->nt_ic;
 1034         struct ieee80211_node *ni;
 1035 
 1036         IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
 1037             "%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
 1038         ni = ieee80211_dup_bss(nt, macaddr);
 1039         if (ni != NULL) {
 1040                 /* XXX no rate negotiation; just dup */
 1041                 ni->ni_rates = ic->ic_bss->ni_rates;
 1042                 if (ic->ic_newassoc != NULL)
 1043                         ic->ic_newassoc(ni, 1);
 1044                 if (ic->ic_opmode == IEEE80211_M_AHDEMO) {
 1045                         /*
 1046                          * In adhoc demo mode there are no management
 1047                          * frames to use to discover neighbor capabilities,
 1048                          * so blindly propagate the local configuration 
 1049                          * so we can do interesting things (e.g. use
 1050                          * WME to disable ACK's).
 1051                          */
 1052                         if (ic->ic_flags & IEEE80211_F_WME)
 1053                                 ni->ni_flags |= IEEE80211_NODE_QOS;
 1054                         if (ic->ic_flags & IEEE80211_F_FF)
 1055                                 ni->ni_flags |= IEEE80211_NODE_FF;
 1056                 }
 1057                 /* XXX not right for 802.1x/WPA */
 1058                 ieee80211_node_authorize(ni);
 1059         }
 1060         return ni;
 1061 }
 1062 
 1063 void
 1064 ieee80211_init_neighbor(struct ieee80211_node *ni,
 1065         const struct ieee80211_frame *wh,
 1066         const struct ieee80211_scanparams *sp)
 1067 {
 1068         ni->ni_esslen = sp->ssid[1];
 1069         memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
 1070         IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
 1071         memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
 1072         ni->ni_intval = sp->bintval;
 1073         ni->ni_capinfo = sp->capinfo;
 1074         ni->ni_chan = ni->ni_ic->ic_curchan;
 1075         ni->ni_fhdwell = sp->fhdwell;
 1076         ni->ni_fhindex = sp->fhindex;
 1077         ni->ni_erp = sp->erp;
 1078         ni->ni_timoff = sp->timoff;
 1079 
 1080         if (ieee80211_ies_init(&ni->ni_ies, sp->ies, sp->ies_len)) {
 1081                 ieee80211_ies_expand(&ni->ni_ies);
 1082                 if (ni->ni_ies.ath_ie != NULL)
 1083                         ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
 1084         }
 1085 
 1086         /* NB: must be after ni_chan is setup */
 1087         ieee80211_setup_rates(ni, sp->rates, sp->xrates,
 1088                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1089                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1090 }
 1091 
 1092 /*
 1093  * Do node discovery in adhoc mode on receipt of a beacon
 1094  * or probe response frame.  Note that for the driver's
 1095  * benefit we we treat this like an association so the
 1096  * driver has an opportunity to setup it's private state.
 1097  */
 1098 struct ieee80211_node *
 1099 ieee80211_add_neighbor(struct ieee80211com *ic,
 1100         const struct ieee80211_frame *wh,
 1101         const struct ieee80211_scanparams *sp)
 1102 {
 1103         struct ieee80211_node *ni;
 1104 
 1105         IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
 1106             "%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
 1107         ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);/* XXX alloc_node? */
 1108         if (ni != NULL) {
 1109                 ieee80211_init_neighbor(ni, wh, sp);
 1110                 if (ic->ic_newassoc != NULL)
 1111                         ic->ic_newassoc(ni, 1);
 1112                 /* XXX not right for 802.1x/WPA */
 1113                 ieee80211_node_authorize(ni);
 1114         }
 1115         return ni;
 1116 }
 1117 
 1118 #define IS_CTL(wh) \
 1119         ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
 1120 #define IS_PSPOLL(wh) \
 1121         ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
 1122 #define IS_BAR(wh) \
 1123         ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_BAR)
 1124 
 1125 /*
 1126  * Locate the node for sender, track state, and then pass the
 1127  * (referenced) node up to the 802.11 layer for its use.  We
 1128  * are required to pass some node so we fall back to ic_bss
 1129  * when this frame is from an unknown sender.  The 802.11 layer
 1130  * knows this means the sender wasn't in the node table and
 1131  * acts accordingly. 
 1132  */
 1133 struct ieee80211_node *
 1134 #ifdef IEEE80211_DEBUG_REFCNT
 1135 ieee80211_find_rxnode_debug(struct ieee80211com *ic,
 1136         const struct ieee80211_frame_min *wh, const char *func, int line)
 1137 #else
 1138 ieee80211_find_rxnode(struct ieee80211com *ic,
 1139         const struct ieee80211_frame_min *wh)
 1140 #endif
 1141 {
 1142         struct ieee80211_node_table *nt;
 1143         struct ieee80211_node *ni;
 1144 
 1145         /* XXX check ic_bss first in station mode */
 1146         /* XXX 4-address frames? */
 1147         nt = &ic->ic_sta;
 1148         IEEE80211_NODE_LOCK(nt);
 1149         if (IS_CTL(wh) && !IS_PSPOLL(wh) && !IS_BAR(wh) /*&& !IS_RTS(ah)*/)
 1150                 ni = _ieee80211_find_node(nt, wh->i_addr1);
 1151         else
 1152                 ni = _ieee80211_find_node(nt, wh->i_addr2);
 1153         if (ni == NULL)
 1154                 ni = ieee80211_ref_node(ic->ic_bss);
 1155         IEEE80211_NODE_UNLOCK(nt);
 1156 
 1157         return ni;
 1158 }
 1159 
 1160 /*
 1161  * Like ieee80211_find_rxnode but use the supplied h/w
 1162  * key index as a hint to locate the node in the key
 1163  * mapping table.  If an entry is present at the key
 1164  * index we return it; otherwise do a normal lookup and
 1165  * update the mapping table if the station has a unicast
 1166  * key assigned to it.
 1167  */
 1168 struct ieee80211_node *
 1169 #ifdef IEEE80211_DEBUG_REFCNT
 1170 ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
 1171         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
 1172         const char *func, int line)
 1173 #else
 1174 ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
 1175         const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
 1176 #endif
 1177 {
 1178         struct ieee80211_node_table *nt;
 1179         struct ieee80211_node *ni;
 1180 
 1181         nt = &ic->ic_sta;
 1182         IEEE80211_NODE_LOCK(nt);
 1183         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
 1184                 ni = nt->nt_keyixmap[keyix];
 1185         else
 1186                 ni = NULL;
 1187         if (ni == NULL) {
 1188                 if (IS_CTL(wh) && !IS_PSPOLL(wh) && !IS_BAR(wh) /*&& !IS_RTS(ah)*/)
 1189                         ni = _ieee80211_find_node(nt, wh->i_addr1);
 1190                 else
 1191                         ni = _ieee80211_find_node(nt, wh->i_addr2);
 1192                 if (ni == NULL)
 1193                         ni = ieee80211_ref_node(ic->ic_bss);
 1194                 if (nt->nt_keyixmap != NULL) {
 1195                         /*
 1196                          * If the station has a unicast key cache slot
 1197                          * assigned update the key->node mapping table.
 1198                          */
 1199                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1200                         /* XXX can keyixmap[keyix] != NULL? */
 1201                         if (keyix < nt->nt_keyixmax &&
 1202                             nt->nt_keyixmap[keyix] == NULL) {
 1203                                 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
 1204                                     "%s: add key map entry %p<%s> refcnt %d\n",
 1205                                     __func__, ni, ether_sprintf(ni->ni_macaddr),
 1206                                     ieee80211_node_refcnt(ni)+1);
 1207                                 nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
 1208                         }
 1209                 }
 1210         } else
 1211                 ieee80211_ref_node(ni);
 1212         IEEE80211_NODE_UNLOCK(nt);
 1213 
 1214         return ni;
 1215 }
 1216 #undef IS_BAR
 1217 #undef IS_PSPOLL
 1218 #undef IS_CTL
 1219 
 1220 /*
 1221  * Return a reference to the appropriate node for sending
 1222  * a data frame.  This handles node discovery in adhoc networks.
 1223  */
 1224 struct ieee80211_node *
 1225 #ifdef IEEE80211_DEBUG_REFCNT
 1226 ieee80211_find_txnode_debug(struct ieee80211com *ic, const uint8_t *macaddr,
 1227         const char *func, int line)
 1228 #else
 1229 ieee80211_find_txnode(struct ieee80211com *ic, const uint8_t *macaddr)
 1230 #endif
 1231 {
 1232         struct ieee80211_node_table *nt = &ic->ic_sta;
 1233         struct ieee80211_node *ni;
 1234 
 1235         /*
 1236          * The destination address should be in the node table
 1237          * unless this is a multicast/broadcast frame.  We can
 1238          * also optimize station mode operation, all frames go
 1239          * to the bss node.
 1240          */
 1241         /* XXX can't hold lock across dup_bss 'cuz of recursive locking */
 1242         IEEE80211_NODE_LOCK(nt);
 1243         if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr))
 1244                 ni = ieee80211_ref_node(ic->ic_bss);
 1245         else {
 1246                 ni = _ieee80211_find_node(nt, macaddr);
 1247                 if (ic->ic_opmode == IEEE80211_M_HOSTAP && 
 1248                     (ni != NULL && ni->ni_associd == 0)) {
 1249                         /*
 1250                          * Station is not associated; don't permit the
 1251                          * data frame to be sent by returning NULL.  This
 1252                          * is kinda a kludge but the least intrusive way
 1253                          * to add this check into all drivers.
 1254                          */
 1255                         ieee80211_unref_node(&ni);      /* NB: null's ni */
 1256                 }
 1257         }
 1258         IEEE80211_NODE_UNLOCK(nt);
 1259 
 1260         if (ni == NULL) {
 1261                 if (ic->ic_opmode == IEEE80211_M_IBSS ||
 1262                     ic->ic_opmode == IEEE80211_M_AHDEMO) {
 1263                         /*
 1264                          * In adhoc mode cons up a node for the destination.
 1265                          * Note that we need an additional reference for the
 1266                          * caller to be consistent with _ieee80211_find_node.
 1267                          */
 1268                         ni = ieee80211_fakeup_adhoc_node(nt, macaddr);
 1269                         if (ni != NULL)
 1270                                 (void) ieee80211_ref_node(ni);
 1271                 } else {
 1272                         IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
 1273                                 "[%s] no node, discard frame (%s)\n",
 1274                                 ether_sprintf(macaddr), __func__);
 1275                         ic->ic_stats.is_tx_nonode++;
 1276                 }
 1277         }
 1278         return ni;
 1279 }
 1280 
 1281 /*
 1282  * Like find but search based on the ssid too.
 1283  */
 1284 struct ieee80211_node *
 1285 #ifdef IEEE80211_DEBUG_REFCNT
 1286 ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt,
 1287         const uint8_t *macaddr, u_int ssidlen, const uint8_t *ssid,
 1288         const char *func, int line)
 1289 #else
 1290 ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt,
 1291         const uint8_t *macaddr, u_int ssidlen, const uint8_t *ssid)
 1292 #endif
 1293 {
 1294 #define MATCH_SSID(ni, ssid, ssidlen) \
 1295         (ni->ni_esslen == ssidlen && memcmp(ni->ni_essid, ssid, ssidlen) == 0)
 1296         static const uint8_t zeromac[IEEE80211_ADDR_LEN];
 1297         struct ieee80211_node *ni;
 1298         int hash;
 1299 
 1300         IEEE80211_NODE_LOCK(nt);
 1301         /*
 1302          * A mac address that is all zero means match only the ssid;
 1303          * otherwise we must match both.
 1304          */
 1305         if (IEEE80211_ADDR_EQ(macaddr, zeromac)) {
 1306                 TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 1307                         if (MATCH_SSID(ni, ssid, ssidlen))
 1308                                 break;
 1309                 }
 1310         } else {
 1311                 hash = IEEE80211_NODE_HASH(macaddr);
 1312                 LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
 1313                         if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) &&
 1314                             MATCH_SSID(ni, ssid, ssidlen))
 1315                                 break;
 1316                 }
 1317         }
 1318         if (ni != NULL) {
 1319                 ieee80211_ref_node(ni); /* mark referenced */
 1320                 IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
 1321                      REFCNT_LOC, ni, ether_sprintf(ni->ni_macaddr),
 1322                      ieee80211_node_refcnt(ni));
 1323         }
 1324         IEEE80211_NODE_UNLOCK(nt);
 1325         return ni;
 1326 #undef MATCH_SSID
 1327 }
 1328 
 1329 static void
 1330 _ieee80211_free_node(struct ieee80211_node *ni)
 1331 {
 1332         struct ieee80211com *ic = ni->ni_ic;
 1333         struct ieee80211_node_table *nt = ni->ni_table;
 1334 
 1335         IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
 1336                 "%s %p<%s> in %s table\n", __func__, ni,
 1337                 ether_sprintf(ni->ni_macaddr),
 1338                 nt != NULL ? nt->nt_name : "<gone>");
 1339 
 1340         IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
 1341         if (nt != NULL) {
 1342                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1343                 LIST_REMOVE(ni, ni_hash);
 1344         }
 1345         ic->ic_node_free(ni);
 1346 }
 1347 
 1348 void
 1349 #ifdef IEEE80211_DEBUG_REFCNT
 1350 ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
 1351 #else
 1352 ieee80211_free_node(struct ieee80211_node *ni)
 1353 #endif
 1354 {
 1355         struct ieee80211_node_table *nt = ni->ni_table;
 1356 
 1357 #ifdef IEEE80211_DEBUG_REFCNT
 1358         IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
 1359                 "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
 1360                  ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
 1361 #endif
 1362         if (nt != NULL) {
 1363                 IEEE80211_NODE_LOCK(nt);
 1364                 if (ieee80211_node_dectestref(ni)) {
 1365                         /*
 1366                          * Last reference, reclaim state.
 1367                          */
 1368                         _ieee80211_free_node(ni);
 1369                 } else if (ieee80211_node_refcnt(ni) == 1 &&
 1370                     nt->nt_keyixmap != NULL) {
 1371                         ieee80211_keyix keyix;
 1372                         /*
 1373                          * Check for a last reference in the key mapping table.
 1374                          */
 1375                         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1376                         if (keyix < nt->nt_keyixmax &&
 1377                             nt->nt_keyixmap[keyix] == ni) {
 1378                                 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
 1379                                     "%s: %p<%s> clear key map entry", __func__,
 1380                                     ni, ether_sprintf(ni->ni_macaddr));
 1381                                 nt->nt_keyixmap[keyix] = NULL;
 1382                                 ieee80211_node_decref(ni); /* XXX needed? */
 1383                                 _ieee80211_free_node(ni);
 1384                         }
 1385                 }
 1386                 IEEE80211_NODE_UNLOCK(nt);
 1387         } else {
 1388                 if (ieee80211_node_dectestref(ni))
 1389                         _ieee80211_free_node(ni);
 1390         }
 1391 }
 1392 
 1393 /*
 1394  * Reclaim a unicast key and clear any key cache state.
 1395  */
 1396 int
 1397 ieee80211_node_delucastkey(struct ieee80211_node *ni)
 1398 {
 1399         struct ieee80211com *ic = ni->ni_ic;
 1400         struct ieee80211_node_table *nt = &ic->ic_sta;
 1401         struct ieee80211_node *nikey;
 1402         ieee80211_keyix keyix;
 1403         int isowned, status;
 1404 
 1405         /*
 1406          * NB: We must beware of LOR here; deleting the key
 1407          * can cause the crypto layer to block traffic updates
 1408          * which can generate a LOR against the node table lock;
 1409          * grab it here and stash the key index for our use below.
 1410          *
 1411          * Must also beware of recursion on the node table lock.
 1412          * When called from node_cleanup we may already have
 1413          * the node table lock held.  Unfortunately there's no
 1414          * way to separate out this path so we must do this
 1415          * conditionally.
 1416          */
 1417         isowned = IEEE80211_NODE_IS_LOCKED(nt);
 1418         if (!isowned)
 1419                 IEEE80211_NODE_LOCK(nt);
 1420         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1421         status = ieee80211_crypto_delkey(ic, &ni->ni_ucastkey);
 1422         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
 1423                 nikey = nt->nt_keyixmap[keyix];
 1424                 nt->nt_keyixmap[keyix] = NULL;;
 1425         } else
 1426                 nikey = NULL;
 1427         if (!isowned)
 1428                 IEEE80211_NODE_UNLOCK(&ic->ic_sta);
 1429 
 1430         if (nikey != NULL) {
 1431                 KASSERT(nikey == ni,
 1432                         ("key map out of sync, ni %p nikey %p", ni, nikey));
 1433                 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
 1434                         "%s: delete key map entry %p<%s> refcnt %d\n",
 1435                         __func__, ni, ether_sprintf(ni->ni_macaddr),
 1436                         ieee80211_node_refcnt(ni)-1);
 1437                 ieee80211_free_node(ni);
 1438         }
 1439         return status;
 1440 }
 1441 
 1442 /*
 1443  * Reclaim a node.  If this is the last reference count then
 1444  * do the normal free work.  Otherwise remove it from the node
 1445  * table and mark it gone by clearing the back-reference.
 1446  */
 1447 static void
 1448 node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 1449 {
 1450         ieee80211_keyix keyix;
 1451 
 1452         IEEE80211_NODE_LOCK_ASSERT(nt);
 1453 
 1454         IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
 1455                 "%s: remove %p<%s> from %s table, refcnt %d\n",
 1456                 __func__, ni, ether_sprintf(ni->ni_macaddr),
 1457                 nt->nt_name, ieee80211_node_refcnt(ni)-1);
 1458         /*
 1459          * Clear any entry in the unicast key mapping table.
 1460          * We need to do it here so rx lookups don't find it
 1461          * in the mapping table even if it's not in the hash
 1462          * table.  We cannot depend on the mapping table entry
 1463          * being cleared because the node may not be free'd.
 1464          */
 1465         keyix = ni->ni_ucastkey.wk_rxkeyix;
 1466         if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
 1467             nt->nt_keyixmap[keyix] == ni) {
 1468                 IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
 1469                         "%s: %p<%s> clear key map entry\n",
 1470                         __func__, ni, ether_sprintf(ni->ni_macaddr));
 1471                 nt->nt_keyixmap[keyix] = NULL;
 1472                 ieee80211_node_decref(ni);      /* NB: don't need free */
 1473         }
 1474         if (!ieee80211_node_dectestref(ni)) {
 1475                 /*
 1476                  * Other references are present, just remove the
 1477                  * node from the table so it cannot be found.  When
 1478                  * the references are dropped storage will be
 1479                  * reclaimed.
 1480                  */
 1481                 TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
 1482                 LIST_REMOVE(ni, ni_hash);
 1483                 ni->ni_table = NULL;            /* clear reference */
 1484         } else
 1485                 _ieee80211_free_node(ni);
 1486 }
 1487 
 1488 static void
 1489 ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt)
 1490 {
 1491         struct ieee80211com *ic = nt->nt_ic;
 1492         struct ieee80211_node *ni;
 1493 
 1494         IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
 1495                 "%s: free all nodes in %s table\n", __func__, nt->nt_name);
 1496 
 1497         while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) {
 1498                 if (ni->ni_associd != 0) {
 1499                         if (ic->ic_auth->ia_node_leave != NULL)
 1500                                 ic->ic_auth->ia_node_leave(ic, ni);
 1501                         IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
 1502                 }
 1503                 node_reclaim(nt, ni);
 1504         }
 1505 }
 1506 
 1507 /*
 1508  * Timeout inactive stations and do related housekeeping.
 1509  * Note that we cannot hold the node lock while sending a
 1510  * frame as this would lead to a LOR.  Instead we use a
 1511  * generation number to mark nodes that we've scanned and
 1512  * drop the lock and restart a scan if we have to time out
 1513  * a node.  Since we are single-threaded by virtue of
 1514  * controlling the inactivity timer we can be sure this will
 1515  * process each node only once.
 1516  */
 1517 static void
 1518 ieee80211_timeout_stations(struct ieee80211_node_table *nt)
 1519 {
 1520         struct ieee80211com *ic = nt->nt_ic;
 1521         struct ieee80211_node *ni;
 1522         u_int gen;
 1523         int isadhoc;
 1524 
 1525         isadhoc = (ic->ic_opmode == IEEE80211_M_IBSS ||
 1526                    ic->ic_opmode == IEEE80211_M_AHDEMO);
 1527         IEEE80211_SCAN_LOCK(nt);
 1528         gen = ++nt->nt_scangen;
 1529 restart:
 1530         IEEE80211_NODE_LOCK(nt);
 1531         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 1532                 if (ni->ni_scangen == gen)      /* previously handled */
 1533                         continue;
 1534                 ni->ni_scangen = gen;
 1535                 /*
 1536                  * Ignore entries for which have yet to receive an
 1537                  * authentication frame.  These are transient and
 1538                  * will be reclaimed when the last reference to them
 1539                  * goes away (when frame xmits complete).
 1540                  */
 1541                 if ((ic->ic_opmode == IEEE80211_M_HOSTAP ||
 1542                      ic->ic_opmode == IEEE80211_M_STA) &&
 1543                     (ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 1544                         continue;
 1545                 /*
 1546                  * Free fragment if not needed anymore
 1547                  * (last fragment older than 1s).
 1548                  * XXX doesn't belong here
 1549                  */
 1550                 if (ni->ni_rxfrag[0] != NULL &&
 1551                     ticks > ni->ni_rxfragstamp + hz) {
 1552                         m_freem(ni->ni_rxfrag[0]);
 1553                         ni->ni_rxfrag[0] = NULL;
 1554                 }
 1555                 if (ni->ni_inact > 0)
 1556                         ni->ni_inact--;
 1557                 /*
 1558                  * Special case ourself; we may be idle for extended periods
 1559                  * of time and regardless reclaiming our state is wrong.
 1560                  */
 1561                 if (ni == ic->ic_bss)
 1562                         continue;
 1563                 if (ni->ni_associd != 0 || isadhoc) {
 1564                         /*
 1565                          * Age frames on the power save queue.
 1566                          */
 1567                         if (ieee80211_node_saveq_age(ni) != 0 &&
 1568                             IEEE80211_NODE_SAVEQ_QLEN(ni) == 0 &&
 1569                             ic->ic_set_tim != NULL)
 1570                                 ic->ic_set_tim(ni, 0);
 1571                         /*
 1572                          * Probe the station before time it out.  We
 1573                          * send a null data frame which may not be
 1574                          * universally supported by drivers (need it
 1575                          * for ps-poll support so it should be...).
 1576                          *
 1577                          * XXX don't probe the station unless we've
 1578                          *     received a frame from them (and have
 1579                          *     some idea of the rates they are capable
 1580                          *     of); this will get fixed more properly
 1581                          *     soon with better handling of the rate set.
 1582                          */
 1583                         if ((ic->ic_flags_ext & IEEE80211_FEXT_INACT) &&
 1584                             (0 < ni->ni_inact &&
 1585                              ni->ni_inact <= ic->ic_inact_probe) &&
 1586                             ni->ni_rates.rs_nrates != 0) {
 1587                                 IEEE80211_NOTE(ic,
 1588                                     IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
 1589                                     ni, "%s",
 1590                                     "probe station due to inactivity");
 1591                                 /*
 1592                                  * Grab a reference before unlocking the table
 1593                                  * so the node cannot be reclaimed before we
 1594                                  * send the frame. ieee80211_send_nulldata
 1595                                  * understands we've done this and reclaims the
 1596                                  * ref for us as needed.
 1597                                  */
 1598                                 ieee80211_ref_node(ni);
 1599                                 IEEE80211_NODE_UNLOCK(nt);
 1600                                 ieee80211_send_nulldata(ni);
 1601                                 /* XXX stat? */
 1602                                 goto restart;
 1603                         }
 1604                 }
 1605                 if ((ic->ic_flags_ext & IEEE80211_FEXT_INACT) &&
 1606                     ni->ni_inact <= 0) {
 1607                         IEEE80211_NOTE(ic,
 1608                             IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
 1609                             "station timed out due to inactivity "
 1610                             "(refcnt %u)", ieee80211_node_refcnt(ni));
 1611                         /*
 1612                          * Send a deauthenticate frame and drop the station.
 1613                          * This is somewhat complicated due to reference counts
 1614                          * and locking.  At this point a station will typically
 1615                          * have a reference count of 1.  ieee80211_node_leave
 1616                          * will do a "free" of the node which will drop the
 1617                          * reference count.  But in the meantime a reference
 1618                          * wil be held by the deauth frame.  The actual reclaim
 1619                          * of the node will happen either after the tx is
 1620                          * completed or by ieee80211_node_leave.
 1621                          *
 1622                          * Separately we must drop the node lock before sending
 1623                          * in case the driver takes a lock, as this can result
 1624                          * in a LOR between the node lock and the driver lock.
 1625                          */
 1626                         ieee80211_ref_node(ni);
 1627                         IEEE80211_NODE_UNLOCK(nt);
 1628                         if (ni->ni_associd != 0) {
 1629                                 IEEE80211_SEND_MGMT(ic, ni,
 1630                                     IEEE80211_FC0_SUBTYPE_DEAUTH,
 1631                                     IEEE80211_REASON_AUTH_EXPIRE);
 1632                         }
 1633                         ieee80211_node_leave(ic, ni);
 1634                         ieee80211_free_node(ni);
 1635                         ic->ic_stats.is_node_timeout++;
 1636                         goto restart;
 1637                 }
 1638         }
 1639         IEEE80211_NODE_UNLOCK(nt);
 1640 
 1641         IEEE80211_SCAN_UNLOCK(nt);
 1642 }
 1643 
 1644 void
 1645 ieee80211_node_timeout(void *arg)
 1646 {
 1647         struct ieee80211com *ic = arg;
 1648 
 1649         ieee80211_scan_timeout(ic);
 1650         ieee80211_timeout_stations(&ic->ic_sta);
 1651 
 1652         IEEE80211_LOCK(ic);
 1653         ieee80211_erp_timeout(ic);
 1654         ieee80211_ht_timeout(ic);
 1655         IEEE80211_UNLOCK(ic);
 1656 
 1657         callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
 1658                 ieee80211_node_timeout, ic);
 1659 }
 1660 
 1661 void
 1662 ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg)
 1663 {
 1664         struct ieee80211_node *ni;
 1665         u_int gen;
 1666 
 1667         IEEE80211_SCAN_LOCK(nt);
 1668         gen = ++nt->nt_scangen;
 1669 restart:
 1670         IEEE80211_NODE_LOCK(nt);
 1671         TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
 1672                 if (ni->ni_scangen != gen) {
 1673                         ni->ni_scangen = gen;
 1674                         (void) ieee80211_ref_node(ni);
 1675                         IEEE80211_NODE_UNLOCK(nt);
 1676                         (*f)(arg, ni);
 1677                         ieee80211_free_node(ni);
 1678                         goto restart;
 1679                 }
 1680         }
 1681         IEEE80211_NODE_UNLOCK(nt);
 1682 
 1683         IEEE80211_SCAN_UNLOCK(nt);
 1684 }
 1685 
 1686 void
 1687 ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
 1688 {
 1689         printf("0x%p: mac %s refcnt %d\n", ni,
 1690                 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
 1691         printf("\tscangen %u authmode %u flags 0x%x\n",
 1692                 ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
 1693         printf("\tassocid 0x%x txpower %u vlan %u\n",
 1694                 ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
 1695         printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
 1696                 ni->ni_txseqs[IEEE80211_NONQOS_TID],
 1697                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT,
 1698                 ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK,
 1699                 ni->ni_rxfragstamp);
 1700         printf("\trstamp %u rssi %d noise %d intval %u capinfo 0x%x\n",
 1701                 ni->ni_rstamp, ni->ni_rssi, ni->ni_noise,
 1702                 ni->ni_intval, ni->ni_capinfo);
 1703         printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
 1704                 ether_sprintf(ni->ni_bssid),
 1705                 ni->ni_esslen, ni->ni_essid,
 1706                 ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
 1707         printf("\tfails %u inact %u txrate %u\n",
 1708                 ni->ni_fails, ni->ni_inact, ni->ni_txrate);
 1709         printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n",
 1710                 ni->ni_htcap, ni->ni_htparam,
 1711                 ni->ni_htctlchan, ni->ni_ht2ndchan);
 1712         printf("\thtopmode %x htstbc %x chw %u\n",
 1713                 ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw);
 1714 }
 1715 
 1716 void
 1717 ieee80211_dump_nodes(struct ieee80211_node_table *nt)
 1718 {
 1719         ieee80211_iterate_nodes(nt,
 1720                 (ieee80211_iter_func *) ieee80211_dump_node, nt);
 1721 }
 1722 
 1723 void
 1724 ieee80211_notify_erp(struct ieee80211com *ic)
 1725 {
 1726         if (ic->ic_opmode == IEEE80211_M_HOSTAP)
 1727                 ieee80211_beacon_notify(ic, IEEE80211_BEACON_ERP);
 1728 }
 1729 
 1730 /*
 1731  * Handle a station joining an 11g network.
 1732  */
 1733 static void
 1734 ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
 1735 {
 1736 
 1737         IEEE80211_LOCK_ASSERT(ic);
 1738 
 1739         /*
 1740          * Station isn't capable of short slot time.  Bump
 1741          * the count of long slot time stations and disable
 1742          * use of short slot time.  Note that the actual switch
 1743          * over to long slot time use may not occur until the
 1744          * next beacon transmission (per sec. 7.3.1.4 of 11g).
 1745          */
 1746         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 1747                 ic->ic_longslotsta++;
 1748                 IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni,
 1749                     "station needs long slot time, count %d",
 1750                     ic->ic_longslotsta);
 1751                 /* XXX vap's w/ conflicting needs won't work */
 1752                 if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
 1753                         /*
 1754                          * Don't force slot time when switched to turbo
 1755                          * mode as non-ERP stations won't be present; this
 1756                          * need only be done when on the normal G channel.
 1757                          */
 1758                         ieee80211_set_shortslottime(ic, 0);
 1759                 }
 1760         }
 1761         /*
 1762          * If the new station is not an ERP station
 1763          * then bump the counter and enable protection
 1764          * if configured.
 1765          */
 1766         if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) {
 1767                 ic->ic_nonerpsta++;
 1768                 IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni,
 1769                     "station is !ERP, %d non-ERP stations associated",
 1770                     ic->ic_nonerpsta);
 1771                 /*
 1772                  * If station does not support short preamble
 1773                  * then we must enable use of Barker preamble.
 1774                  */
 1775                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
 1776                         IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni,
 1777                             "%s", "station needs long preamble");
 1778                         ic->ic_flags |= IEEE80211_F_USEBARKER;
 1779                         ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
 1780                 }
 1781                 /*
 1782                  * If protection is configured, enable it.
 1783                  */
 1784                 if (ic->ic_protmode != IEEE80211_PROT_NONE &&
 1785                     ic->ic_nonerpsta == 1 &&
 1786                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 1787                         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
 1788                             "%s: enable use of protection\n", __func__);
 1789                         ic->ic_flags |= IEEE80211_F_USEPROT;
 1790                         ieee80211_notify_erp(ic);
 1791                 }
 1792         } else
 1793                 ni->ni_flags |= IEEE80211_NODE_ERP;
 1794 }
 1795 
 1796 void
 1797 ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp)
 1798 {
 1799         int newassoc;
 1800 
 1801         if (ni->ni_associd == 0) {
 1802                 uint16_t aid;
 1803 
 1804                 IEEE80211_LOCK(ic);
 1805                 /*
 1806                  * It would be good to search the bitmap
 1807                  * more efficiently, but this will do for now.
 1808                  */
 1809                 for (aid = 1; aid < ic->ic_max_aid; aid++) {
 1810                         if (!IEEE80211_AID_ISSET(aid,
 1811                             ic->ic_aid_bitmap))
 1812                                 break;
 1813                 }
 1814                 if (aid >= ic->ic_max_aid) {
 1815                         IEEE80211_UNLOCK(ic);
 1816                         IEEE80211_SEND_MGMT(ic, ni, resp,
 1817                             IEEE80211_STATUS_TOOMANY);
 1818                         ieee80211_node_leave(ic, ni);
 1819                         return;
 1820                 }
 1821                 ni->ni_associd = aid | 0xc000;
 1822                 ni->ni_jointime = time_uptime;
 1823                 IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap);
 1824                 ic->ic_sta_assoc++;
 1825 
 1826                 if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 1827                         ieee80211_ht_node_join(ni);
 1828                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 1829                     IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 1830                         ieee80211_node_join_11g(ic, ni);
 1831                 IEEE80211_UNLOCK(ic);
 1832 
 1833                 newassoc = 1;
 1834         } else
 1835                 newassoc = 0;
 1836 
 1837         IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 1838             "station associated at aid %d: %s preamble, %s slot time%s%s%s%s%s%s",
 1839             IEEE80211_NODE_AID(ni),
 1840             ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
 1841             ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
 1842             ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
 1843             ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
 1844             ni->ni_flags & IEEE80211_NODE_HT ?
 1845                 (ni->ni_chw == 20 ? ", HT20" : ", HT40") : "",
 1846             ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
 1847             IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_FF) ?
 1848                 ", fast-frames" : "",
 1849             IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_TURBOP) ?
 1850                 ", turbo" : ""
 1851         );
 1852 
 1853         /* give driver a chance to setup state like ni_txrate */
 1854         if (ic->ic_newassoc != NULL)
 1855                 ic->ic_newassoc(ni, newassoc);
 1856         IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS);
 1857         /* tell the authenticator about new station */
 1858         if (ic->ic_auth->ia_node_join != NULL)
 1859                 ic->ic_auth->ia_node_join(ic, ni);
 1860         ieee80211_notify_node_join(ic, ni,
 1861             resp == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
 1862 }
 1863 
 1864 static void
 1865 disable_protection(struct ieee80211com *ic)
 1866 {
 1867         KASSERT(ic->ic_nonerpsta == 0 &&
 1868             (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0,
 1869            ("%d non ERP stations, flags 0x%x", ic->ic_nonerpsta,
 1870            ic->ic_flags_ext));
 1871 
 1872         ic->ic_flags &= ~IEEE80211_F_USEPROT;
 1873         /* XXX verify mode? */
 1874         if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
 1875                 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
 1876                 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
 1877         }
 1878         ieee80211_notify_erp(ic);
 1879 }
 1880 
 1881 /*
 1882  * Handle a station leaving an 11g network.
 1883  */
 1884 static void
 1885 ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
 1886 {
 1887 
 1888         IEEE80211_LOCK_ASSERT(ic);
 1889 
 1890         KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
 1891              ("not in 11g, bss %u:0x%x, curmode %u", ic->ic_bsschan->ic_freq,
 1892               ic->ic_bsschan->ic_flags, ic->ic_curmode));
 1893 
 1894         /*
 1895          * If a long slot station do the slot time bookkeeping.
 1896          */
 1897         if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
 1898                 KASSERT(ic->ic_longslotsta > 0,
 1899                     ("bogus long slot station count %d", ic->ic_longslotsta));
 1900                 ic->ic_longslotsta--;
 1901                 IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni,
 1902                     "long slot time station leaves, count now %d",
 1903                     ic->ic_longslotsta);
 1904                 if (ic->ic_longslotsta == 0) {
 1905                         /*
 1906                          * Re-enable use of short slot time if supported
 1907                          * and not operating in IBSS mode (per spec).
 1908                          */
 1909                         if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
 1910                             ic->ic_opmode != IEEE80211_M_IBSS) {
 1911                                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
 1912                                     "%s: re-enable use of short slot time\n",
 1913                                     __func__);
 1914                                 ieee80211_set_shortslottime(ic, 1);
 1915                         }
 1916                 }
 1917         }
 1918         /*
 1919          * If a non-ERP station do the protection-related bookkeeping.
 1920          */
 1921         if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
 1922                 KASSERT(ic->ic_nonerpsta > 0,
 1923                     ("bogus non-ERP station count %d", ic->ic_nonerpsta));
 1924                 ic->ic_nonerpsta--;
 1925                 IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni,
 1926                     "non-ERP station leaves, count now %d%s", ic->ic_nonerpsta,
 1927                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) ?
 1928                         " (non-ERP sta present)" : "");
 1929                 if (ic->ic_nonerpsta == 0 &&
 1930                     (ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
 1931                         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
 1932                                 "%s: disable use of protection\n", __func__);
 1933                         disable_protection(ic);
 1934                 }
 1935         }
 1936 }
 1937 
 1938 /*
 1939  * Time out presence of an overlapping bss with non-ERP
 1940  * stations.  When operating in hostap mode we listen for
 1941  * beacons from other stations and if we identify a non-ERP
 1942  * station is present we enable protection.  To identify
 1943  * when all non-ERP stations are gone we time out this
 1944  * condition.
 1945  */
 1946 static void
 1947 ieee80211_erp_timeout(struct ieee80211com *ic)
 1948 {
 1949 
 1950         IEEE80211_LOCK_ASSERT(ic);
 1951 
 1952         if ((ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) &&
 1953             time_after(ticks, ic->ic_lastnonerp + IEEE80211_NONERP_PRESENT_AGE)) {
 1954                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
 1955                     "%s\n", "age out non-ERP sta present on channel");
 1956                 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 1957                 if (ic->ic_nonerpsta == 0)
 1958                         disable_protection(ic);
 1959         }
 1960 }
 1961 
 1962 /*
 1963  * Handle bookkeeping for station deauthentication/disassociation
 1964  * when operating as an ap.
 1965  */
 1966 void
 1967 ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
 1968 {
 1969         struct ieee80211_node_table *nt = ni->ni_table;
 1970 
 1971         IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
 1972             "station with aid %d leaves", IEEE80211_NODE_AID(ni));
 1973 
 1974         KASSERT(ic->ic_opmode != IEEE80211_M_STA,
 1975                 ("unexpected operating mode %u", ic->ic_opmode));
 1976         /*
 1977          * If node wasn't previously associated all
 1978          * we need to do is reclaim the reference.
 1979          */
 1980         /* XXX ibss mode bypasses 11g and notification */
 1981         if (ni->ni_associd == 0)
 1982                 goto done;
 1983         /*
 1984          * Tell the authenticator the station is leaving.
 1985          * Note that we must do this before yanking the
 1986          * association id as the authenticator uses the
 1987          * associd to locate it's state block.
 1988          */
 1989         if (ic->ic_auth->ia_node_leave != NULL)
 1990                 ic->ic_auth->ia_node_leave(ic, ni);
 1991 
 1992         IEEE80211_LOCK(ic);
 1993         IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
 1994         ni->ni_associd = 0;
 1995         ic->ic_sta_assoc--;
 1996 
 1997         if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
 1998                 ieee80211_ht_node_leave(ni);
 1999         if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2000             IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
 2001                 ieee80211_node_leave_11g(ic, ni);
 2002         IEEE80211_UNLOCK(ic);
 2003         /*
 2004          * Cleanup station state.  In particular clear various
 2005          * state that might otherwise be reused if the node
 2006          * is reused before the reference count goes to zero
 2007          * (and memory is reclaimed).
 2008          */
 2009         ieee80211_sta_leave(ic, ni);
 2010 done:
 2011         /*
 2012          * Remove the node from any table it's recorded in and
 2013          * drop the caller's reference.  Removal from the table
 2014          * is important to insure the node is not reprocessed
 2015          * for inactivity.
 2016          */
 2017         if (nt != NULL) {
 2018                 IEEE80211_NODE_LOCK(nt);
 2019                 node_reclaim(nt, ni);
 2020                 IEEE80211_NODE_UNLOCK(nt);
 2021         } else
 2022                 ieee80211_free_node(ni);
 2023 }
 2024 
 2025 int8_t
 2026 ieee80211_getrssi(struct ieee80211com *ic)
 2027 {
 2028 #define NZ(x)   ((x) == 0 ? 1 : (x))
 2029         struct ieee80211_node_table *nt = &ic->ic_sta;
 2030         int rssi_samples;
 2031         int32_t rssi_total;
 2032         struct ieee80211_node *ni;
 2033 
 2034         rssi_total = 0;
 2035         rssi_samples = 0;
 2036         switch (ic->ic_opmode) {
 2037         case IEEE80211_M_IBSS:          /* average of all ibss neighbors */
 2038         case IEEE80211_M_AHDEMO:        /* average of all neighbors */
 2039         case IEEE80211_M_HOSTAP:        /* average of all associated stations */
 2040                 /* XXX locking */
 2041                 TAILQ_FOREACH(ni, &nt->nt_node, ni_list)
 2042                         if (ic->ic_opmode == IEEE80211_M_HOSTAP ||
 2043                             (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS)) {
 2044                                 int8_t rssi = ic->ic_node_getrssi(ni);
 2045                                 if (rssi != 0) {
 2046                                         rssi_samples++;
 2047                                         rssi_total += rssi;
 2048                                 }
 2049                         }
 2050                 break;
 2051         case IEEE80211_M_MONITOR:       /* XXX */
 2052         case IEEE80211_M_STA:           /* use stats from associated ap */
 2053         default:
 2054                 if (ic->ic_bss != NULL)
 2055                         rssi_total = ic->ic_node_getrssi(ic->ic_bss);
 2056                 rssi_samples = 1;
 2057                 break;
 2058         }
 2059         return rssi_total / NZ(rssi_samples);
 2060 #undef NZ
 2061 }
 2062 
 2063 void
 2064 ieee80211_getsignal(struct ieee80211com *ic, int8_t *rssi, int8_t *noise)
 2065 {
 2066 
 2067         if (ic->ic_bss == NULL)         /* NB: shouldn't happen */
 2068                 return;
 2069         ic->ic_node_getsignal(ic->ic_bss, rssi, noise);
 2070         /* for non-station mode return avg'd rssi accounting */
 2071         if (ic->ic_opmode != IEEE80211_M_STA)
 2072                 *rssi = ieee80211_getrssi(ic);
 2073 }
 2074 
 2075 /*
 2076  * Node table support.
 2077  */
 2078 
 2079 static void
 2080 ieee80211_node_table_init(struct ieee80211com *ic,
 2081         struct ieee80211_node_table *nt,
 2082         const char *name, int inact, int keyixmax)
 2083 {
 2084 
 2085         IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
 2086                 "%s %s table, inact %u\n", __func__, name, inact);
 2087 
 2088         nt->nt_ic = ic;
 2089         /* XXX need unit */
 2090         IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname);
 2091         IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname);
 2092         TAILQ_INIT(&nt->nt_node);
 2093         nt->nt_name = name;
 2094         nt->nt_scangen = 1;
 2095         nt->nt_inact_init = inact;
 2096         nt->nt_keyixmax = keyixmax;
 2097         if (nt->nt_keyixmax > 0) {
 2098                 MALLOC(nt->nt_keyixmap, struct ieee80211_node **,
 2099                         keyixmax * sizeof(struct ieee80211_node *),
 2100                         M_80211_NODE, M_NOWAIT | M_ZERO);
 2101                 if (nt->nt_keyixmap == NULL)
 2102                         if_printf(ic->ic_ifp,
 2103                             "Cannot allocate key index map with %u entries\n",
 2104                             keyixmax);
 2105         } else
 2106                 nt->nt_keyixmap = NULL;
 2107 }
 2108 
 2109 static void
 2110 ieee80211_node_table_reset(struct ieee80211_node_table *nt)
 2111 {
 2112 
 2113         IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
 2114                 "%s %s table\n", __func__, nt->nt_name);
 2115 
 2116         IEEE80211_NODE_LOCK(nt);
 2117         ieee80211_free_allnodes_locked(nt);
 2118         IEEE80211_NODE_UNLOCK(nt);
 2119 }
 2120 
 2121 static void
 2122 ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
 2123 {
 2124 
 2125         IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
 2126                 "%s %s table\n", __func__, nt->nt_name);
 2127 
 2128         IEEE80211_NODE_LOCK(nt);
 2129         ieee80211_free_allnodes_locked(nt);
 2130         if (nt->nt_keyixmap != NULL) {
 2131                 /* XXX verify all entries are NULL */
 2132                 int i;
 2133                 for (i = 0; i < nt->nt_keyixmax; i++)
 2134                         if (nt->nt_keyixmap[i] != NULL)
 2135                                 printf("%s: %s[%u] still active\n", __func__,
 2136                                         nt->nt_name, i);
 2137                 FREE(nt->nt_keyixmap, M_80211_NODE);
 2138                 nt->nt_keyixmap = NULL;
 2139         }
 2140         IEEE80211_SCAN_LOCK_DESTROY(nt);
 2141         IEEE80211_NODE_LOCK_DESTROY(nt);
 2142 }

Cache object: 1d5bba7c8c084d797f15086ec607a3a6


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