The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211.c

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.0/sys/net80211/ieee80211.c 300232 2016-05-19 21:08:33Z avos $");
   29 
   30 /*
   31  * IEEE 802.11 generic handler
   32  */
   33 #include "opt_wlan.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/malloc.h>
   39 #include <sys/socket.h>
   40 #include <sys/sbuf.h>
   41 
   42 #include <machine/stdarg.h>
   43 
   44 #include <net/if.h>
   45 #include <net/if_var.h>
   46 #include <net/if_dl.h>
   47 #include <net/if_media.h>
   48 #include <net/if_types.h>
   49 #include <net/ethernet.h>
   50 
   51 #include <net80211/ieee80211_var.h>
   52 #include <net80211/ieee80211_regdomain.h>
   53 #ifdef IEEE80211_SUPPORT_SUPERG
   54 #include <net80211/ieee80211_superg.h>
   55 #endif
   56 #include <net80211/ieee80211_ratectl.h>
   57 
   58 #include <net/bpf.h>
   59 
   60 const char *ieee80211_phymode_name[IEEE80211_MODE_MAX] = {
   61         [IEEE80211_MODE_AUTO]     = "auto",
   62         [IEEE80211_MODE_11A]      = "11a",
   63         [IEEE80211_MODE_11B]      = "11b",
   64         [IEEE80211_MODE_11G]      = "11g",
   65         [IEEE80211_MODE_FH]       = "FH",
   66         [IEEE80211_MODE_TURBO_A]  = "turboA",
   67         [IEEE80211_MODE_TURBO_G]  = "turboG",
   68         [IEEE80211_MODE_STURBO_A] = "sturboA",
   69         [IEEE80211_MODE_HALF]     = "half",
   70         [IEEE80211_MODE_QUARTER]  = "quarter",
   71         [IEEE80211_MODE_11NA]     = "11na",
   72         [IEEE80211_MODE_11NG]     = "11ng",
   73 };
   74 /* map ieee80211_opmode to the corresponding capability bit */
   75 const int ieee80211_opcap[IEEE80211_OPMODE_MAX] = {
   76         [IEEE80211_M_IBSS]      = IEEE80211_C_IBSS,
   77         [IEEE80211_M_WDS]       = IEEE80211_C_WDS,
   78         [IEEE80211_M_STA]       = IEEE80211_C_STA,
   79         [IEEE80211_M_AHDEMO]    = IEEE80211_C_AHDEMO,
   80         [IEEE80211_M_HOSTAP]    = IEEE80211_C_HOSTAP,
   81         [IEEE80211_M_MONITOR]   = IEEE80211_C_MONITOR,
   82 #ifdef IEEE80211_SUPPORT_MESH
   83         [IEEE80211_M_MBSS]      = IEEE80211_C_MBSS,
   84 #endif
   85 };
   86 
   87 const uint8_t ieee80211broadcastaddr[IEEE80211_ADDR_LEN] =
   88         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
   89 
   90 static  void ieee80211_syncflag_locked(struct ieee80211com *ic, int flag);
   91 static  void ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag);
   92 static  void ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag);
   93 static  int ieee80211_media_setup(struct ieee80211com *ic,
   94                 struct ifmedia *media, int caps, int addsta,
   95                 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
   96 static  int media_status(enum ieee80211_opmode,
   97                 const struct ieee80211_channel *);
   98 static uint64_t ieee80211_get_counter(struct ifnet *, ift_counter);
   99 
  100 MALLOC_DEFINE(M_80211_VAP, "80211vap", "802.11 vap state");
  101 
  102 /*
  103  * Default supported rates for 802.11 operation (in IEEE .5Mb units).
  104  */
  105 #define B(r)    ((r) | IEEE80211_RATE_BASIC)
  106 static const struct ieee80211_rateset ieee80211_rateset_11a =
  107         { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } };
  108 static const struct ieee80211_rateset ieee80211_rateset_half =
  109         { 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } };
  110 static const struct ieee80211_rateset ieee80211_rateset_quarter =
  111         { 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } };
  112 static const struct ieee80211_rateset ieee80211_rateset_11b =
  113         { 4, { B(2), B(4), B(11), B(22) } };
  114 /* NB: OFDM rates are handled specially based on mode */
  115 static const struct ieee80211_rateset ieee80211_rateset_11g =
  116         { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } };
  117 #undef B
  118 
  119 /*
  120  * Fill in 802.11 available channel set, mark
  121  * all available channels as active, and pick
  122  * a default channel if not already specified.
  123  */
  124 void
  125 ieee80211_chan_init(struct ieee80211com *ic)
  126 {
  127 #define DEFAULTRATES(m, def) do { \
  128         if (ic->ic_sup_rates[m].rs_nrates == 0) \
  129                 ic->ic_sup_rates[m] = def; \
  130 } while (0)
  131         struct ieee80211_channel *c;
  132         int i;
  133 
  134         KASSERT(0 < ic->ic_nchans && ic->ic_nchans <= IEEE80211_CHAN_MAX,
  135                 ("invalid number of channels specified: %u", ic->ic_nchans));
  136         memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
  137         memset(ic->ic_modecaps, 0, sizeof(ic->ic_modecaps));
  138         setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO);
  139         for (i = 0; i < ic->ic_nchans; i++) {
  140                 c = &ic->ic_channels[i];
  141                 KASSERT(c->ic_flags != 0, ("channel with no flags"));
  142                 /*
  143                  * Help drivers that work only with frequencies by filling
  144                  * in IEEE channel #'s if not already calculated.  Note this
  145                  * mimics similar work done in ieee80211_setregdomain when
  146                  * changing regulatory state.
  147                  */
  148                 if (c->ic_ieee == 0)
  149                         c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
  150                 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
  151                         c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
  152                             (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
  153                             c->ic_flags);
  154                 /* default max tx power to max regulatory */
  155                 if (c->ic_maxpower == 0)
  156                         c->ic_maxpower = 2*c->ic_maxregpower;
  157                 setbit(ic->ic_chan_avail, c->ic_ieee);
  158                 /*
  159                  * Identify mode capabilities.
  160                  */
  161                 if (IEEE80211_IS_CHAN_A(c))
  162                         setbit(ic->ic_modecaps, IEEE80211_MODE_11A);
  163                 if (IEEE80211_IS_CHAN_B(c))
  164                         setbit(ic->ic_modecaps, IEEE80211_MODE_11B);
  165                 if (IEEE80211_IS_CHAN_ANYG(c))
  166                         setbit(ic->ic_modecaps, IEEE80211_MODE_11G);
  167                 if (IEEE80211_IS_CHAN_FHSS(c))
  168                         setbit(ic->ic_modecaps, IEEE80211_MODE_FH);
  169                 if (IEEE80211_IS_CHAN_108A(c))
  170                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A);
  171                 if (IEEE80211_IS_CHAN_108G(c))
  172                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G);
  173                 if (IEEE80211_IS_CHAN_ST(c))
  174                         setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A);
  175                 if (IEEE80211_IS_CHAN_HALF(c))
  176                         setbit(ic->ic_modecaps, IEEE80211_MODE_HALF);
  177                 if (IEEE80211_IS_CHAN_QUARTER(c))
  178                         setbit(ic->ic_modecaps, IEEE80211_MODE_QUARTER);
  179                 if (IEEE80211_IS_CHAN_HTA(c))
  180                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NA);
  181                 if (IEEE80211_IS_CHAN_HTG(c))
  182                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NG);
  183         }
  184         /* initialize candidate channels to all available */
  185         memcpy(ic->ic_chan_active, ic->ic_chan_avail,
  186                 sizeof(ic->ic_chan_avail));
  187 
  188         /* sort channel table to allow lookup optimizations */
  189         ieee80211_sort_channels(ic->ic_channels, ic->ic_nchans);
  190 
  191         /* invalidate any previous state */
  192         ic->ic_bsschan = IEEE80211_CHAN_ANYC;
  193         ic->ic_prevchan = NULL;
  194         ic->ic_csa_newchan = NULL;
  195         /* arbitrarily pick the first channel */
  196         ic->ic_curchan = &ic->ic_channels[0];
  197         ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  198 
  199         /* fillin well-known rate sets if driver has not specified */
  200         DEFAULTRATES(IEEE80211_MODE_11B,         ieee80211_rateset_11b);
  201         DEFAULTRATES(IEEE80211_MODE_11G,         ieee80211_rateset_11g);
  202         DEFAULTRATES(IEEE80211_MODE_11A,         ieee80211_rateset_11a);
  203         DEFAULTRATES(IEEE80211_MODE_TURBO_A,     ieee80211_rateset_11a);
  204         DEFAULTRATES(IEEE80211_MODE_TURBO_G,     ieee80211_rateset_11g);
  205         DEFAULTRATES(IEEE80211_MODE_STURBO_A,    ieee80211_rateset_11a);
  206         DEFAULTRATES(IEEE80211_MODE_HALF,        ieee80211_rateset_half);
  207         DEFAULTRATES(IEEE80211_MODE_QUARTER,     ieee80211_rateset_quarter);
  208         DEFAULTRATES(IEEE80211_MODE_11NA,        ieee80211_rateset_11a);
  209         DEFAULTRATES(IEEE80211_MODE_11NG,        ieee80211_rateset_11g);
  210 
  211         /*
  212          * Setup required information to fill the mcsset field, if driver did
  213          * not. Assume a 2T2R setup for historic reasons.
  214          */
  215         if (ic->ic_rxstream == 0)
  216                 ic->ic_rxstream = 2;
  217         if (ic->ic_txstream == 0)
  218                 ic->ic_txstream = 2;
  219 
  220         /*
  221          * Set auto mode to reset active channel state and any desired channel.
  222          */
  223         (void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
  224 #undef DEFAULTRATES
  225 }
  226 
  227 static void
  228 null_update_mcast(struct ieee80211com *ic)
  229 {
  230 
  231         ic_printf(ic, "need multicast update callback\n");
  232 }
  233 
  234 static void
  235 null_update_promisc(struct ieee80211com *ic)
  236 {
  237 
  238         ic_printf(ic, "need promiscuous mode update callback\n");
  239 }
  240 
  241 static void
  242 null_update_chw(struct ieee80211com *ic)
  243 {
  244 
  245         ic_printf(ic, "%s: need callback\n", __func__);
  246 }
  247 
  248 int
  249 ic_printf(struct ieee80211com *ic, const char * fmt, ...)
  250 { 
  251         va_list ap;
  252         int retval;
  253 
  254         retval = printf("%s: ", ic->ic_name);
  255         va_start(ap, fmt);
  256         retval += vprintf(fmt, ap);
  257         va_end(ap);  
  258         return (retval);
  259 }
  260 
  261 static LIST_HEAD(, ieee80211com) ic_head = LIST_HEAD_INITIALIZER(ic_head);
  262 static struct mtx ic_list_mtx;
  263 MTX_SYSINIT(ic_list, &ic_list_mtx, "ieee80211com list", MTX_DEF);
  264 
  265 static int
  266 sysctl_ieee80211coms(SYSCTL_HANDLER_ARGS)
  267 {
  268         struct ieee80211com *ic;
  269         struct sbuf sb;
  270         char *sp;
  271         int error;
  272 
  273         error = sysctl_wire_old_buffer(req, 0);
  274         if (error)
  275                 return (error);
  276         sbuf_new_for_sysctl(&sb, NULL, 8, req);
  277         sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
  278         sp = "";
  279         mtx_lock(&ic_list_mtx);
  280         LIST_FOREACH(ic, &ic_head, ic_next) {
  281                 sbuf_printf(&sb, "%s%s", sp, ic->ic_name);
  282                 sp = " ";
  283         }
  284         mtx_unlock(&ic_list_mtx);
  285         error = sbuf_finish(&sb);
  286         sbuf_delete(&sb);
  287         return (error);
  288 }
  289 
  290 SYSCTL_PROC(_net_wlan, OID_AUTO, devices,
  291     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
  292     sysctl_ieee80211coms, "A", "names of available 802.11 devices");
  293 
  294 /*
  295  * Attach/setup the common net80211 state.  Called by
  296  * the driver on attach to prior to creating any vap's.
  297  */
  298 void
  299 ieee80211_ifattach(struct ieee80211com *ic)
  300 {
  301 
  302         IEEE80211_LOCK_INIT(ic, ic->ic_name);
  303         IEEE80211_TX_LOCK_INIT(ic, ic->ic_name);
  304         TAILQ_INIT(&ic->ic_vaps);
  305 
  306         /* Create a taskqueue for all state changes */
  307         ic->ic_tq = taskqueue_create("ic_taskq", M_WAITOK | M_ZERO,
  308             taskqueue_thread_enqueue, &ic->ic_tq);
  309         taskqueue_start_threads(&ic->ic_tq, 1, PI_NET, "%s net80211 taskq",
  310             ic->ic_name);
  311         ic->ic_ierrors = counter_u64_alloc(M_WAITOK);
  312         ic->ic_oerrors = counter_u64_alloc(M_WAITOK);
  313         /*
  314          * Fill in 802.11 available channel set, mark all
  315          * available channels as active, and pick a default
  316          * channel if not already specified.
  317          */
  318         ieee80211_chan_init(ic);
  319 
  320         ic->ic_update_mcast = null_update_mcast;
  321         ic->ic_update_promisc = null_update_promisc;
  322         ic->ic_update_chw = null_update_chw;
  323 
  324         ic->ic_hash_key = arc4random();
  325         ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
  326         ic->ic_lintval = ic->ic_bintval;
  327         ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
  328 
  329         ieee80211_crypto_attach(ic);
  330         ieee80211_node_attach(ic);
  331         ieee80211_power_attach(ic);
  332         ieee80211_proto_attach(ic);
  333 #ifdef IEEE80211_SUPPORT_SUPERG
  334         ieee80211_superg_attach(ic);
  335 #endif
  336         ieee80211_ht_attach(ic);
  337         ieee80211_scan_attach(ic);
  338         ieee80211_regdomain_attach(ic);
  339         ieee80211_dfs_attach(ic);
  340 
  341         ieee80211_sysctl_attach(ic);
  342 
  343         mtx_lock(&ic_list_mtx);
  344         LIST_INSERT_HEAD(&ic_head, ic, ic_next);
  345         mtx_unlock(&ic_list_mtx);
  346 }
  347 
  348 /*
  349  * Detach net80211 state on device detach.  Tear down
  350  * all vap's and reclaim all common state prior to the
  351  * device state going away.  Note we may call back into
  352  * driver; it must be prepared for this.
  353  */
  354 void
  355 ieee80211_ifdetach(struct ieee80211com *ic)
  356 {
  357         struct ieee80211vap *vap;
  358 
  359         mtx_lock(&ic_list_mtx);
  360         LIST_REMOVE(ic, ic_next);
  361         mtx_unlock(&ic_list_mtx);
  362 
  363         taskqueue_drain(taskqueue_thread, &ic->ic_restart_task);
  364 
  365         /*
  366          * The VAP is responsible for setting and clearing
  367          * the VIMAGE context.
  368          */
  369         while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
  370                 ieee80211_vap_destroy(vap);
  371         ieee80211_waitfor_parent(ic);
  372 
  373         ieee80211_sysctl_detach(ic);
  374         ieee80211_dfs_detach(ic);
  375         ieee80211_regdomain_detach(ic);
  376         ieee80211_scan_detach(ic);
  377 #ifdef IEEE80211_SUPPORT_SUPERG
  378         ieee80211_superg_detach(ic);
  379 #endif
  380         ieee80211_ht_detach(ic);
  381         /* NB: must be called before ieee80211_node_detach */
  382         ieee80211_proto_detach(ic);
  383         ieee80211_crypto_detach(ic);
  384         ieee80211_power_detach(ic);
  385         ieee80211_node_detach(ic);
  386 
  387         counter_u64_free(ic->ic_ierrors);
  388         counter_u64_free(ic->ic_oerrors);
  389 
  390         taskqueue_free(ic->ic_tq);
  391         IEEE80211_TX_LOCK_DESTROY(ic);
  392         IEEE80211_LOCK_DESTROY(ic);
  393 }
  394 
  395 struct ieee80211com *
  396 ieee80211_find_com(const char *name)
  397 {
  398         struct ieee80211com *ic;
  399 
  400         mtx_lock(&ic_list_mtx);
  401         LIST_FOREACH(ic, &ic_head, ic_next)
  402                 if (strcmp(ic->ic_name, name) == 0)
  403                         break;
  404         mtx_unlock(&ic_list_mtx);
  405 
  406         return (ic);
  407 }
  408 
  409 void
  410 ieee80211_iterate_coms(ieee80211_com_iter_func *f, void *arg)
  411 {
  412         struct ieee80211com *ic;
  413 
  414         mtx_lock(&ic_list_mtx);
  415         LIST_FOREACH(ic, &ic_head, ic_next)
  416                 (*f)(arg, ic);
  417         mtx_unlock(&ic_list_mtx);
  418 }
  419 
  420 /*
  421  * Default reset method for use with the ioctl support.  This
  422  * method is invoked after any state change in the 802.11
  423  * layer that should be propagated to the hardware but not
  424  * require re-initialization of the 802.11 state machine (e.g
  425  * rescanning for an ap).  We always return ENETRESET which
  426  * should cause the driver to re-initialize the device. Drivers
  427  * can override this method to implement more optimized support.
  428  */
  429 static int
  430 default_reset(struct ieee80211vap *vap, u_long cmd)
  431 {
  432         return ENETRESET;
  433 }
  434 
  435 /*
  436  * Add underlying device errors to vap errors.
  437  */
  438 static uint64_t
  439 ieee80211_get_counter(struct ifnet *ifp, ift_counter cnt)
  440 {
  441         struct ieee80211vap *vap = ifp->if_softc;
  442         struct ieee80211com *ic = vap->iv_ic;
  443         uint64_t rv;
  444 
  445         rv = if_get_counter_default(ifp, cnt);
  446         switch (cnt) {
  447         case IFCOUNTER_OERRORS:
  448                 rv += counter_u64_fetch(ic->ic_oerrors);
  449                 break;
  450         case IFCOUNTER_IERRORS:
  451                 rv += counter_u64_fetch(ic->ic_ierrors);
  452                 break;
  453         default:
  454                 break;
  455         }
  456 
  457         return (rv);
  458 }
  459 
  460 /*
  461  * Prepare a vap for use.  Drivers use this call to
  462  * setup net80211 state in new vap's prior attaching
  463  * them with ieee80211_vap_attach (below).
  464  */
  465 int
  466 ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
  467     const char name[IFNAMSIZ], int unit, enum ieee80211_opmode opmode,
  468     int flags, const uint8_t bssid[IEEE80211_ADDR_LEN])
  469 {
  470         struct ifnet *ifp;
  471 
  472         ifp = if_alloc(IFT_ETHER);
  473         if (ifp == NULL) {
  474                 ic_printf(ic, "%s: unable to allocate ifnet\n",
  475                     __func__);
  476                 return ENOMEM;
  477         }
  478         if_initname(ifp, name, unit);
  479         ifp->if_softc = vap;                    /* back pointer */
  480         ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
  481         ifp->if_transmit = ieee80211_vap_transmit;
  482         ifp->if_qflush = ieee80211_vap_qflush;
  483         ifp->if_ioctl = ieee80211_ioctl;
  484         ifp->if_init = ieee80211_init;
  485         ifp->if_get_counter = ieee80211_get_counter;
  486 
  487         vap->iv_ifp = ifp;
  488         vap->iv_ic = ic;
  489         vap->iv_flags = ic->ic_flags;           /* propagate common flags */
  490         vap->iv_flags_ext = ic->ic_flags_ext;
  491         vap->iv_flags_ven = ic->ic_flags_ven;
  492         vap->iv_caps = ic->ic_caps &~ IEEE80211_C_OPMODE;
  493         vap->iv_htcaps = ic->ic_htcaps;
  494         vap->iv_htextcaps = ic->ic_htextcaps;
  495         vap->iv_opmode = opmode;
  496         vap->iv_caps |= ieee80211_opcap[opmode];
  497         IEEE80211_ADDR_COPY(vap->iv_myaddr, ic->ic_macaddr);
  498         switch (opmode) {
  499         case IEEE80211_M_WDS:
  500                 /*
  501                  * WDS links must specify the bssid of the far end.
  502                  * For legacy operation this is a static relationship.
  503                  * For non-legacy operation the station must associate
  504                  * and be authorized to pass traffic.  Plumbing the
  505                  * vap to the proper node happens when the vap
  506                  * transitions to RUN state.
  507                  */
  508                 IEEE80211_ADDR_COPY(vap->iv_des_bssid, bssid);
  509                 vap->iv_flags |= IEEE80211_F_DESBSSID;
  510                 if (flags & IEEE80211_CLONE_WDSLEGACY)
  511                         vap->iv_flags_ext |= IEEE80211_FEXT_WDSLEGACY;
  512                 break;
  513 #ifdef IEEE80211_SUPPORT_TDMA
  514         case IEEE80211_M_AHDEMO:
  515                 if (flags & IEEE80211_CLONE_TDMA) {
  516                         /* NB: checked before clone operation allowed */
  517                         KASSERT(ic->ic_caps & IEEE80211_C_TDMA,
  518                             ("not TDMA capable, ic_caps 0x%x", ic->ic_caps));
  519                         /*
  520                          * Propagate TDMA capability to mark vap; this
  521                          * cannot be removed and is used to distinguish
  522                          * regular ahdemo operation from ahdemo+tdma.
  523                          */
  524                         vap->iv_caps |= IEEE80211_C_TDMA;
  525                 }
  526                 break;
  527 #endif
  528         default:
  529                 break;
  530         }
  531         /* auto-enable s/w beacon miss support */
  532         if (flags & IEEE80211_CLONE_NOBEACONS)
  533                 vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
  534         /* auto-generated or user supplied MAC address */
  535         if (flags & (IEEE80211_CLONE_BSSID|IEEE80211_CLONE_MACADDR))
  536                 vap->iv_flags_ext |= IEEE80211_FEXT_UNIQMAC;
  537         /*
  538          * Enable various functionality by default if we're
  539          * capable; the driver can override us if it knows better.
  540          */
  541         if (vap->iv_caps & IEEE80211_C_WME)
  542                 vap->iv_flags |= IEEE80211_F_WME;
  543         if (vap->iv_caps & IEEE80211_C_BURST)
  544                 vap->iv_flags |= IEEE80211_F_BURST;
  545         /* NB: bg scanning only makes sense for station mode right now */
  546         if (vap->iv_opmode == IEEE80211_M_STA &&
  547             (vap->iv_caps & IEEE80211_C_BGSCAN))
  548                 vap->iv_flags |= IEEE80211_F_BGSCAN;
  549         vap->iv_flags |= IEEE80211_F_DOTH;      /* XXX no cap, just ena */
  550         /* NB: DFS support only makes sense for ap mode right now */
  551         if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
  552             (vap->iv_caps & IEEE80211_C_DFS))
  553                 vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
  554 
  555         vap->iv_des_chan = IEEE80211_CHAN_ANYC;         /* any channel is ok */
  556         vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
  557         vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
  558         /*
  559          * Install a default reset method for the ioctl support;
  560          * the driver can override this.
  561          */
  562         vap->iv_reset = default_reset;
  563 
  564         ieee80211_sysctl_vattach(vap);
  565         ieee80211_crypto_vattach(vap);
  566         ieee80211_node_vattach(vap);
  567         ieee80211_power_vattach(vap);
  568         ieee80211_proto_vattach(vap);
  569 #ifdef IEEE80211_SUPPORT_SUPERG
  570         ieee80211_superg_vattach(vap);
  571 #endif
  572         ieee80211_ht_vattach(vap);
  573         ieee80211_scan_vattach(vap);
  574         ieee80211_regdomain_vattach(vap);
  575         ieee80211_radiotap_vattach(vap);
  576         ieee80211_ratectl_set(vap, IEEE80211_RATECTL_NONE);
  577 
  578         return 0;
  579 }
  580 
  581 /*
  582  * Activate a vap.  State should have been prepared with a
  583  * call to ieee80211_vap_setup and by the driver.  On return
  584  * from this call the vap is ready for use.
  585  */
  586 int
  587 ieee80211_vap_attach(struct ieee80211vap *vap, ifm_change_cb_t media_change,
  588     ifm_stat_cb_t media_stat, const uint8_t macaddr[IEEE80211_ADDR_LEN])
  589 {
  590         struct ifnet *ifp = vap->iv_ifp;
  591         struct ieee80211com *ic = vap->iv_ic;
  592         struct ifmediareq imr;
  593         int maxrate;
  594 
  595         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  596             "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
  597             __func__, ieee80211_opmode_name[vap->iv_opmode],
  598             ic->ic_name, vap->iv_flags, vap->iv_flags_ext);
  599 
  600         /*
  601          * Do late attach work that cannot happen until after
  602          * the driver has had a chance to override defaults.
  603          */
  604         ieee80211_node_latevattach(vap);
  605         ieee80211_power_latevattach(vap);
  606 
  607         maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
  608             vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
  609         ieee80211_media_status(ifp, &imr);
  610         /* NB: strip explicit mode; we're actually in autoselect */
  611         ifmedia_set(&vap->iv_media,
  612             imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
  613         if (maxrate)
  614                 ifp->if_baudrate = IF_Mbps(maxrate);
  615 
  616         ether_ifattach(ifp, macaddr);
  617         IEEE80211_ADDR_COPY(vap->iv_myaddr, IF_LLADDR(ifp));
  618         /* hook output method setup by ether_ifattach */
  619         vap->iv_output = ifp->if_output;
  620         ifp->if_output = ieee80211_output;
  621         /* NB: if_mtu set by ether_ifattach to ETHERMTU */
  622 
  623         IEEE80211_LOCK(ic);
  624         TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
  625         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  626 #ifdef IEEE80211_SUPPORT_SUPERG
  627         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  628 #endif
  629         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  630         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  631         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  632         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  633         IEEE80211_UNLOCK(ic);
  634 
  635         return 1;
  636 }
  637 
  638 /* 
  639  * Tear down vap state and reclaim the ifnet.
  640  * The driver is assumed to have prepared for
  641  * this; e.g. by turning off interrupts for the
  642  * underlying device.
  643  */
  644 void
  645 ieee80211_vap_detach(struct ieee80211vap *vap)
  646 {
  647         struct ieee80211com *ic = vap->iv_ic;
  648         struct ifnet *ifp = vap->iv_ifp;
  649 
  650         CURVNET_SET(ifp->if_vnet);
  651 
  652         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
  653             __func__, ieee80211_opmode_name[vap->iv_opmode], ic->ic_name);
  654 
  655         /* NB: bpfdetach is called by ether_ifdetach and claims all taps */
  656         ether_ifdetach(ifp);
  657 
  658         ieee80211_stop(vap);
  659 
  660         /*
  661          * Flush any deferred vap tasks.
  662          */
  663         ieee80211_draintask(ic, &vap->iv_nstate_task);
  664         ieee80211_draintask(ic, &vap->iv_swbmiss_task);
  665 
  666         /* XXX band-aid until ifnet handles this for us */
  667         taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
  668 
  669         IEEE80211_LOCK(ic);
  670         KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
  671         TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
  672         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  673 #ifdef IEEE80211_SUPPORT_SUPERG
  674         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  675 #endif
  676         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  677         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  678         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  679         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  680         /* NB: this handles the bpfdetach done below */
  681         ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
  682         if (vap->iv_ifflags & IFF_PROMISC)
  683                 ieee80211_promisc(vap, false);
  684         if (vap->iv_ifflags & IFF_ALLMULTI)
  685                 ieee80211_allmulti(vap, false);
  686         IEEE80211_UNLOCK(ic);
  687 
  688         ifmedia_removeall(&vap->iv_media);
  689 
  690         ieee80211_radiotap_vdetach(vap);
  691         ieee80211_regdomain_vdetach(vap);
  692         ieee80211_scan_vdetach(vap);
  693 #ifdef IEEE80211_SUPPORT_SUPERG
  694         ieee80211_superg_vdetach(vap);
  695 #endif
  696         ieee80211_ht_vdetach(vap);
  697         /* NB: must be before ieee80211_node_vdetach */
  698         ieee80211_proto_vdetach(vap);
  699         ieee80211_crypto_vdetach(vap);
  700         ieee80211_power_vdetach(vap);
  701         ieee80211_node_vdetach(vap);
  702         ieee80211_sysctl_vdetach(vap);
  703 
  704         if_free(ifp);
  705 
  706         CURVNET_RESTORE();
  707 }
  708 
  709 /*
  710  * Count number of vaps in promisc, and issue promisc on
  711  * parent respectively.
  712  */
  713 void
  714 ieee80211_promisc(struct ieee80211vap *vap, bool on)
  715 {
  716         struct ieee80211com *ic = vap->iv_ic;
  717 
  718         IEEE80211_LOCK_ASSERT(ic);
  719 
  720         if (on) {
  721                 if (++ic->ic_promisc == 1)
  722                         ieee80211_runtask(ic, &ic->ic_promisc_task);
  723         } else {
  724                 KASSERT(ic->ic_promisc > 0, ("%s: ic %p not promisc",
  725                     __func__, ic));
  726                 if (--ic->ic_promisc == 0)
  727                         ieee80211_runtask(ic, &ic->ic_promisc_task);
  728         }
  729 }
  730 
  731 /*
  732  * Count number of vaps in allmulti, and issue allmulti on
  733  * parent respectively.
  734  */
  735 void
  736 ieee80211_allmulti(struct ieee80211vap *vap, bool on)
  737 {
  738         struct ieee80211com *ic = vap->iv_ic;
  739 
  740         IEEE80211_LOCK_ASSERT(ic);
  741 
  742         if (on) {
  743                 if (++ic->ic_allmulti == 1)
  744                         ieee80211_runtask(ic, &ic->ic_mcast_task);
  745         } else {
  746                 KASSERT(ic->ic_allmulti > 0, ("%s: ic %p not allmulti",
  747                     __func__, ic));
  748                 if (--ic->ic_allmulti == 0)
  749                         ieee80211_runtask(ic, &ic->ic_mcast_task);
  750         }
  751 }
  752 
  753 /*
  754  * Synchronize flag bit state in the com structure
  755  * according to the state of all vap's.  This is used,
  756  * for example, to handle state changes via ioctls.
  757  */
  758 static void
  759 ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
  760 {
  761         struct ieee80211vap *vap;
  762         int bit;
  763 
  764         IEEE80211_LOCK_ASSERT(ic);
  765 
  766         bit = 0;
  767         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  768                 if (vap->iv_flags & flag) {
  769                         bit = 1;
  770                         break;
  771                 }
  772         if (bit)
  773                 ic->ic_flags |= flag;
  774         else
  775                 ic->ic_flags &= ~flag;
  776 }
  777 
  778 void
  779 ieee80211_syncflag(struct ieee80211vap *vap, int flag)
  780 {
  781         struct ieee80211com *ic = vap->iv_ic;
  782 
  783         IEEE80211_LOCK(ic);
  784         if (flag < 0) {
  785                 flag = -flag;
  786                 vap->iv_flags &= ~flag;
  787         } else
  788                 vap->iv_flags |= flag;
  789         ieee80211_syncflag_locked(ic, flag);
  790         IEEE80211_UNLOCK(ic);
  791 }
  792 
  793 /*
  794  * Synchronize flags_ht bit state in the com structure
  795  * according to the state of all vap's.  This is used,
  796  * for example, to handle state changes via ioctls.
  797  */
  798 static void
  799 ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
  800 {
  801         struct ieee80211vap *vap;
  802         int bit;
  803 
  804         IEEE80211_LOCK_ASSERT(ic);
  805 
  806         bit = 0;
  807         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  808                 if (vap->iv_flags_ht & flag) {
  809                         bit = 1;
  810                         break;
  811                 }
  812         if (bit)
  813                 ic->ic_flags_ht |= flag;
  814         else
  815                 ic->ic_flags_ht &= ~flag;
  816 }
  817 
  818 void
  819 ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
  820 {
  821         struct ieee80211com *ic = vap->iv_ic;
  822 
  823         IEEE80211_LOCK(ic);
  824         if (flag < 0) {
  825                 flag = -flag;
  826                 vap->iv_flags_ht &= ~flag;
  827         } else
  828                 vap->iv_flags_ht |= flag;
  829         ieee80211_syncflag_ht_locked(ic, flag);
  830         IEEE80211_UNLOCK(ic);
  831 }
  832 
  833 /*
  834  * Synchronize flags_ext bit state in the com structure
  835  * according to the state of all vap's.  This is used,
  836  * for example, to handle state changes via ioctls.
  837  */
  838 static void
  839 ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
  840 {
  841         struct ieee80211vap *vap;
  842         int bit;
  843 
  844         IEEE80211_LOCK_ASSERT(ic);
  845 
  846         bit = 0;
  847         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  848                 if (vap->iv_flags_ext & flag) {
  849                         bit = 1;
  850                         break;
  851                 }
  852         if (bit)
  853                 ic->ic_flags_ext |= flag;
  854         else
  855                 ic->ic_flags_ext &= ~flag;
  856 }
  857 
  858 void
  859 ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
  860 {
  861         struct ieee80211com *ic = vap->iv_ic;
  862 
  863         IEEE80211_LOCK(ic);
  864         if (flag < 0) {
  865                 flag = -flag;
  866                 vap->iv_flags_ext &= ~flag;
  867         } else
  868                 vap->iv_flags_ext |= flag;
  869         ieee80211_syncflag_ext_locked(ic, flag);
  870         IEEE80211_UNLOCK(ic);
  871 }
  872 
  873 static __inline int
  874 mapgsm(u_int freq, u_int flags)
  875 {
  876         freq *= 10;
  877         if (flags & IEEE80211_CHAN_QUARTER)
  878                 freq += 5;
  879         else if (flags & IEEE80211_CHAN_HALF)
  880                 freq += 10;
  881         else
  882                 freq += 20;
  883         /* NB: there is no 907/20 wide but leave room */
  884         return (freq - 906*10) / 5;
  885 }
  886 
  887 static __inline int
  888 mappsb(u_int freq, u_int flags)
  889 {
  890         return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
  891 }
  892 
  893 /*
  894  * Convert MHz frequency to IEEE channel number.
  895  */
  896 int
  897 ieee80211_mhz2ieee(u_int freq, u_int flags)
  898 {
  899 #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
  900         if (flags & IEEE80211_CHAN_GSM)
  901                 return mapgsm(freq, flags);
  902         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  903                 if (freq == 2484)
  904                         return 14;
  905                 if (freq < 2484)
  906                         return ((int) freq - 2407) / 5;
  907                 else
  908                         return 15 + ((freq - 2512) / 20);
  909         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  910                 if (freq <= 5000) {
  911                         /* XXX check regdomain? */
  912                         if (IS_FREQ_IN_PSB(freq))
  913                                 return mappsb(freq, flags);
  914                         return (freq - 4000) / 5;
  915                 } else
  916                         return (freq - 5000) / 5;
  917         } else {                                /* either, guess */
  918                 if (freq == 2484)
  919                         return 14;
  920                 if (freq < 2484) {
  921                         if (907 <= freq && freq <= 922)
  922                                 return mapgsm(freq, flags);
  923                         return ((int) freq - 2407) / 5;
  924                 }
  925                 if (freq < 5000) {
  926                         if (IS_FREQ_IN_PSB(freq))
  927                                 return mappsb(freq, flags);
  928                         else if (freq > 4900)
  929                                 return (freq - 4000) / 5;
  930                         else
  931                                 return 15 + ((freq - 2512) / 20);
  932                 }
  933                 return (freq - 5000) / 5;
  934         }
  935 #undef IS_FREQ_IN_PSB
  936 }
  937 
  938 /*
  939  * Convert channel to IEEE channel number.
  940  */
  941 int
  942 ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
  943 {
  944         if (c == NULL) {
  945                 ic_printf(ic, "invalid channel (NULL)\n");
  946                 return 0;               /* XXX */
  947         }
  948         return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
  949 }
  950 
  951 /*
  952  * Convert IEEE channel number to MHz frequency.
  953  */
  954 u_int
  955 ieee80211_ieee2mhz(u_int chan, u_int flags)
  956 {
  957         if (flags & IEEE80211_CHAN_GSM)
  958                 return 907 + 5 * (chan / 10);
  959         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  960                 if (chan == 14)
  961                         return 2484;
  962                 if (chan < 14)
  963                         return 2407 + chan*5;
  964                 else
  965                         return 2512 + ((chan-15)*20);
  966         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  967                 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
  968                         chan -= 37;
  969                         return 4940 + chan*5 + (chan % 5 ? 2 : 0);
  970                 }
  971                 return 5000 + (chan*5);
  972         } else {                                /* either, guess */
  973                 /* XXX can't distinguish PSB+GSM channels */
  974                 if (chan == 14)
  975                         return 2484;
  976                 if (chan < 14)                  /* 0-13 */
  977                         return 2407 + chan*5;
  978                 if (chan < 27)                  /* 15-26 */
  979                         return 2512 + ((chan-15)*20);
  980                 return 5000 + (chan*5);
  981         }
  982 }
  983 
  984 static __inline void
  985 set_extchan(struct ieee80211_channel *c)
  986 {
  987 
  988         /*
  989          * IEEE Std 802.11-2012, page 1738, subclause 20.3.15.4:
  990          * "the secondary channel number shall be 'N + [1,-1] * 4'
  991          */
  992         if (c->ic_flags & IEEE80211_CHAN_HT40U)
  993                 c->ic_extieee = c->ic_ieee + 4;
  994         else if (c->ic_flags & IEEE80211_CHAN_HT40D)
  995                 c->ic_extieee = c->ic_ieee - 4;
  996         else
  997                 c->ic_extieee = 0;
  998 }
  999 
 1000 static int
 1001 addchan(struct ieee80211_channel chans[], int maxchans, int *nchans,
 1002     uint8_t ieee, uint16_t freq, int8_t maxregpower, uint32_t flags)
 1003 {
 1004         struct ieee80211_channel *c;
 1005 
 1006         if (*nchans >= maxchans)
 1007                 return (ENOBUFS);
 1008 
 1009         c = &chans[(*nchans)++];
 1010         c->ic_ieee = ieee;
 1011         c->ic_freq = freq != 0 ? freq : ieee80211_ieee2mhz(ieee, flags);
 1012         c->ic_maxregpower = maxregpower;
 1013         c->ic_maxpower = 2 * maxregpower;
 1014         c->ic_flags = flags;
 1015         set_extchan(c);
 1016 
 1017         return (0);
 1018 }
 1019 
 1020 static int
 1021 copychan_prev(struct ieee80211_channel chans[], int maxchans, int *nchans,
 1022     uint32_t flags)
 1023 {
 1024         struct ieee80211_channel *c;
 1025 
 1026         KASSERT(*nchans > 0, ("channel list is empty\n"));
 1027 
 1028         if (*nchans >= maxchans)
 1029                 return (ENOBUFS);
 1030 
 1031         c = &chans[(*nchans)++];
 1032         c[0] = c[-1];
 1033         c->ic_flags = flags;
 1034         set_extchan(c);
 1035 
 1036         return (0);
 1037 }
 1038 
 1039 static void
 1040 getflags_2ghz(const uint8_t bands[], uint32_t flags[], int ht40)
 1041 {
 1042         int nmodes;
 1043 
 1044         nmodes = 0;
 1045         if (isset(bands, IEEE80211_MODE_11B))
 1046                 flags[nmodes++] = IEEE80211_CHAN_B;
 1047         if (isset(bands, IEEE80211_MODE_11G))
 1048                 flags[nmodes++] = IEEE80211_CHAN_G;
 1049         if (isset(bands, IEEE80211_MODE_11NG))
 1050                 flags[nmodes++] = IEEE80211_CHAN_G | IEEE80211_CHAN_HT20;
 1051         if (ht40) {
 1052                 flags[nmodes++] = IEEE80211_CHAN_G | IEEE80211_CHAN_HT40U;
 1053                 flags[nmodes++] = IEEE80211_CHAN_G | IEEE80211_CHAN_HT40D;
 1054         }
 1055         flags[nmodes] = 0;
 1056 }
 1057 
 1058 static void
 1059 getflags_5ghz(const uint8_t bands[], uint32_t flags[], int ht40)
 1060 {
 1061         int nmodes;
 1062 
 1063         nmodes = 0;
 1064         if (isset(bands, IEEE80211_MODE_11A))
 1065                 flags[nmodes++] = IEEE80211_CHAN_A;
 1066         if (isset(bands, IEEE80211_MODE_11NA))
 1067                 flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT20;
 1068         if (ht40) {
 1069                 flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U;
 1070                 flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D;
 1071         }
 1072         flags[nmodes] = 0;
 1073 }
 1074 
 1075 static void
 1076 getflags(const uint8_t bands[], uint32_t flags[], int ht40)
 1077 {
 1078 
 1079         flags[0] = 0;
 1080         if (isset(bands, IEEE80211_MODE_11A) ||
 1081             isset(bands, IEEE80211_MODE_11NA)) {
 1082                 if (isset(bands, IEEE80211_MODE_11B) ||
 1083                     isset(bands, IEEE80211_MODE_11G) ||
 1084                     isset(bands, IEEE80211_MODE_11NG))
 1085                         return;
 1086 
 1087                 getflags_5ghz(bands, flags, ht40);
 1088         } else
 1089                 getflags_2ghz(bands, flags, ht40);
 1090 }
 1091 
 1092 /*
 1093  * Add one 20 MHz channel into specified channel list.
 1094  */
 1095 int
 1096 ieee80211_add_channel(struct ieee80211_channel chans[], int maxchans,
 1097     int *nchans, uint8_t ieee, uint16_t freq, int8_t maxregpower,
 1098     uint32_t chan_flags, const uint8_t bands[])
 1099 {
 1100         uint32_t flags[IEEE80211_MODE_MAX];
 1101         int i, error;
 1102 
 1103         getflags(bands, flags, 0);
 1104         KASSERT(flags[0] != 0, ("%s: no correct mode provided\n", __func__));
 1105 
 1106         error = addchan(chans, maxchans, nchans, ieee, freq, maxregpower,
 1107             flags[0] | chan_flags);
 1108         for (i = 1; flags[i] != 0 && error == 0; i++) {
 1109                 error = copychan_prev(chans, maxchans, nchans,
 1110                     flags[i] | chan_flags);
 1111         }
 1112 
 1113         return (error);
 1114 }
 1115 
 1116 static struct ieee80211_channel *
 1117 findchannel(struct ieee80211_channel chans[], int nchans, uint16_t freq,
 1118     uint32_t flags)
 1119 {
 1120         struct ieee80211_channel *c;
 1121         int i;
 1122 
 1123         flags &= IEEE80211_CHAN_ALLTURBO;
 1124         /* brute force search */
 1125         for (i = 0; i < nchans; i++) {
 1126                 c = &chans[i];
 1127                 if (c->ic_freq == freq &&
 1128                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
 1129                         return c;
 1130         }
 1131         return NULL;
 1132 }
 1133 
 1134 /*
 1135  * Add 40 MHz channel pair into specified channel list.
 1136  */
 1137 int
 1138 ieee80211_add_channel_ht40(struct ieee80211_channel chans[], int maxchans,
 1139     int *nchans, uint8_t ieee, int8_t maxregpower, uint32_t flags)
 1140 {
 1141         struct ieee80211_channel *cent, *extc;
 1142         uint16_t freq;
 1143         int error;
 1144 
 1145         freq = ieee80211_ieee2mhz(ieee, flags);
 1146 
 1147         /*
 1148          * Each entry defines an HT40 channel pair; find the
 1149          * center channel, then the extension channel above.
 1150          */
 1151         flags |= IEEE80211_CHAN_HT20;
 1152         cent = findchannel(chans, *nchans, freq, flags);
 1153         if (cent == NULL)
 1154                 return (EINVAL);
 1155 
 1156         extc = findchannel(chans, *nchans, freq + 20, flags);
 1157         if (extc == NULL)
 1158                 return (ENOENT);
 1159 
 1160         flags &= ~IEEE80211_CHAN_HT;
 1161         error = addchan(chans, maxchans, nchans, cent->ic_ieee, cent->ic_freq,
 1162             maxregpower, flags | IEEE80211_CHAN_HT40U);
 1163         if (error != 0)
 1164                 return (error);
 1165 
 1166         error = addchan(chans, maxchans, nchans, extc->ic_ieee, extc->ic_freq,
 1167             maxregpower, flags | IEEE80211_CHAN_HT40D);
 1168 
 1169         return (error);
 1170 }
 1171 
 1172 /*
 1173  * Adds channels into specified channel list (ieee[] array must be sorted).
 1174  * Channels are already sorted.
 1175  */
 1176 static int
 1177 add_chanlist(struct ieee80211_channel chans[], int maxchans, int *nchans,
 1178     const uint8_t ieee[], int nieee, uint32_t flags[])
 1179 {
 1180         uint16_t freq;
 1181         int i, j, error;
 1182 
 1183         for (i = 0; i < nieee; i++) {
 1184                 freq = ieee80211_ieee2mhz(ieee[i], flags[0]);
 1185                 for (j = 0; flags[j] != 0; j++) {
 1186                         if (flags[j] & IEEE80211_CHAN_HT40D)
 1187                                 if (i == 0 || ieee[i] < ieee[0] + 4 ||
 1188                                     freq - 20 !=
 1189                                     ieee80211_ieee2mhz(ieee[i] - 4, flags[j]))
 1190                                         continue;
 1191                         if (flags[j] & IEEE80211_CHAN_HT40U)
 1192                                 if (i == nieee - 1 ||
 1193                                     ieee[i] + 4 > ieee[nieee - 1] ||
 1194                                     freq + 20 !=
 1195                                     ieee80211_ieee2mhz(ieee[i] + 4, flags[j]))
 1196                                         continue;
 1197 
 1198                         if (j == 0) {
 1199                                 error = addchan(chans, maxchans, nchans,
 1200                                     ieee[i], freq, 0, flags[j]);
 1201                         } else {
 1202                                 error = copychan_prev(chans, maxchans, nchans,
 1203                                     flags[j]);
 1204                         }
 1205                         if (error != 0)
 1206                                 return (error);
 1207                 }
 1208         }
 1209 
 1210         return (0);
 1211 }
 1212 
 1213 int
 1214 ieee80211_add_channel_list_2ghz(struct ieee80211_channel chans[], int maxchans,
 1215     int *nchans, const uint8_t ieee[], int nieee, const uint8_t bands[],
 1216     int ht40)
 1217 {
 1218         uint32_t flags[IEEE80211_MODE_MAX];
 1219 
 1220         getflags_2ghz(bands, flags, ht40);
 1221         KASSERT(flags[0] != 0, ("%s: no correct mode provided\n", __func__));
 1222 
 1223         return (add_chanlist(chans, maxchans, nchans, ieee, nieee, flags));
 1224 }
 1225 
 1226 int
 1227 ieee80211_add_channel_list_5ghz(struct ieee80211_channel chans[], int maxchans,
 1228     int *nchans, const uint8_t ieee[], int nieee, const uint8_t bands[],
 1229     int ht40)
 1230 {
 1231         uint32_t flags[IEEE80211_MODE_MAX];
 1232 
 1233         getflags_5ghz(bands, flags, ht40);
 1234         KASSERT(flags[0] != 0, ("%s: no correct mode provided\n", __func__));
 1235 
 1236         return (add_chanlist(chans, maxchans, nchans, ieee, nieee, flags));
 1237 }
 1238 
 1239 /*
 1240  * Locate a channel given a frequency+flags.  We cache
 1241  * the previous lookup to optimize switching between two
 1242  * channels--as happens with dynamic turbo.
 1243  */
 1244 struct ieee80211_channel *
 1245 ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
 1246 {
 1247         struct ieee80211_channel *c;
 1248 
 1249         flags &= IEEE80211_CHAN_ALLTURBO;
 1250         c = ic->ic_prevchan;
 1251         if (c != NULL && c->ic_freq == freq &&
 1252             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
 1253                 return c;
 1254         /* brute force search */
 1255         return (findchannel(ic->ic_channels, ic->ic_nchans, freq, flags));
 1256 }
 1257 
 1258 /*
 1259  * Locate a channel given a channel number+flags.  We cache
 1260  * the previous lookup to optimize switching between two
 1261  * channels--as happens with dynamic turbo.
 1262  */
 1263 struct ieee80211_channel *
 1264 ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
 1265 {
 1266         struct ieee80211_channel *c;
 1267         int i;
 1268 
 1269         flags &= IEEE80211_CHAN_ALLTURBO;
 1270         c = ic->ic_prevchan;
 1271         if (c != NULL && c->ic_ieee == ieee &&
 1272             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
 1273                 return c;
 1274         /* brute force search */
 1275         for (i = 0; i < ic->ic_nchans; i++) {
 1276                 c = &ic->ic_channels[i];
 1277                 if (c->ic_ieee == ieee &&
 1278                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
 1279                         return c;
 1280         }
 1281         return NULL;
 1282 }
 1283 
 1284 /*
 1285  * Lookup a channel suitable for the given rx status.
 1286  *
 1287  * This is used to find a channel for a frame (eg beacon, probe
 1288  * response) based purely on the received PHY information.
 1289  *
 1290  * For now it tries to do it based on R_FREQ / R_IEEE.
 1291  * This is enough for 11bg and 11a (and thus 11ng/11na)
 1292  * but it will not be enough for GSM, PSB channels and the
 1293  * like.  It also doesn't know about legacy-turbog and
 1294  * legacy-turbo modes, which some offload NICs actually
 1295  * support in weird ways.
 1296  *
 1297  * Takes the ic and rxstatus; returns the channel or NULL
 1298  * if not found.
 1299  *
 1300  * XXX TODO: Add support for that when the need arises.
 1301  */
 1302 struct ieee80211_channel *
 1303 ieee80211_lookup_channel_rxstatus(struct ieee80211vap *vap,
 1304     const struct ieee80211_rx_stats *rxs)
 1305 {
 1306         struct ieee80211com *ic = vap->iv_ic;
 1307         uint32_t flags;
 1308         struct ieee80211_channel *c;
 1309 
 1310         if (rxs == NULL)
 1311                 return (NULL);
 1312 
 1313         /*
 1314          * Strictly speaking we only use freq for now,
 1315          * however later on we may wish to just store
 1316          * the ieee for verification.
 1317          */
 1318         if ((rxs->r_flags & IEEE80211_R_FREQ) == 0)
 1319                 return (NULL);
 1320         if ((rxs->r_flags & IEEE80211_R_IEEE) == 0)
 1321                 return (NULL);
 1322 
 1323         /*
 1324          * If the rx status contains a valid ieee/freq, then
 1325          * ensure we populate the correct channel information
 1326          * in rxchan before passing it up to the scan infrastructure.
 1327          * Offload NICs will pass up beacons from all channels
 1328          * during background scans.
 1329          */
 1330 
 1331         /* Determine a band */
 1332         /* XXX should be done by the driver? */
 1333         if (rxs->c_freq < 3000) {
 1334                 flags = IEEE80211_CHAN_G;
 1335         } else {
 1336                 flags = IEEE80211_CHAN_A;
 1337         }
 1338 
 1339         /* Channel lookup */
 1340         c = ieee80211_find_channel(ic, rxs->c_freq, flags);
 1341 
 1342         IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT,
 1343             "%s: freq=%d, ieee=%d, flags=0x%08x; c=%p\n",
 1344             __func__,
 1345             (int) rxs->c_freq,
 1346             (int) rxs->c_ieee,
 1347             flags,
 1348             c);
 1349 
 1350         return (c);
 1351 }
 1352 
 1353 static void
 1354 addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
 1355 {
 1356 #define ADD(_ic, _s, _o) \
 1357         ifmedia_add(media, \
 1358                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
 1359         static const u_int mopts[IEEE80211_MODE_MAX] = { 
 1360             [IEEE80211_MODE_AUTO]       = IFM_AUTO,
 1361             [IEEE80211_MODE_11A]        = IFM_IEEE80211_11A,
 1362             [IEEE80211_MODE_11B]        = IFM_IEEE80211_11B,
 1363             [IEEE80211_MODE_11G]        = IFM_IEEE80211_11G,
 1364             [IEEE80211_MODE_FH]         = IFM_IEEE80211_FH,
 1365             [IEEE80211_MODE_TURBO_A]    = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
 1366             [IEEE80211_MODE_TURBO_G]    = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
 1367             [IEEE80211_MODE_STURBO_A]   = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
 1368             [IEEE80211_MODE_HALF]       = IFM_IEEE80211_11A,    /* XXX */
 1369             [IEEE80211_MODE_QUARTER]    = IFM_IEEE80211_11A,    /* XXX */
 1370             [IEEE80211_MODE_11NA]       = IFM_IEEE80211_11NA,
 1371             [IEEE80211_MODE_11NG]       = IFM_IEEE80211_11NG,
 1372         };
 1373         u_int mopt;
 1374 
 1375         mopt = mopts[mode];
 1376         if (addsta)
 1377                 ADD(ic, mword, mopt);   /* STA mode has no cap */
 1378         if (caps & IEEE80211_C_IBSS)
 1379                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
 1380         if (caps & IEEE80211_C_HOSTAP)
 1381                 ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
 1382         if (caps & IEEE80211_C_AHDEMO)
 1383                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
 1384         if (caps & IEEE80211_C_MONITOR)
 1385                 ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
 1386         if (caps & IEEE80211_C_WDS)
 1387                 ADD(media, mword, mopt | IFM_IEEE80211_WDS);
 1388         if (caps & IEEE80211_C_MBSS)
 1389                 ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
 1390 #undef ADD
 1391 }
 1392 
 1393 /*
 1394  * Setup the media data structures according to the channel and
 1395  * rate tables.
 1396  */
 1397 static int
 1398 ieee80211_media_setup(struct ieee80211com *ic,
 1399         struct ifmedia *media, int caps, int addsta,
 1400         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
 1401 {
 1402         int i, j, rate, maxrate, mword, r;
 1403         enum ieee80211_phymode mode;
 1404         const struct ieee80211_rateset *rs;
 1405         struct ieee80211_rateset allrates;
 1406 
 1407         /*
 1408          * Fill in media characteristics.
 1409          */
 1410         ifmedia_init(media, 0, media_change, media_stat);
 1411         maxrate = 0;
 1412         /*
 1413          * Add media for legacy operating modes.
 1414          */
 1415         memset(&allrates, 0, sizeof(allrates));
 1416         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
 1417                 if (isclr(ic->ic_modecaps, mode))
 1418                         continue;
 1419                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1420                 if (mode == IEEE80211_MODE_AUTO)
 1421                         continue;
 1422                 rs = &ic->ic_sup_rates[mode];
 1423                 for (i = 0; i < rs->rs_nrates; i++) {
 1424                         rate = rs->rs_rates[i];
 1425                         mword = ieee80211_rate2media(ic, rate, mode);
 1426                         if (mword == 0)
 1427                                 continue;
 1428                         addmedia(media, caps, addsta, mode, mword);
 1429                         /*
 1430                          * Add legacy rate to the collection of all rates.
 1431                          */
 1432                         r = rate & IEEE80211_RATE_VAL;
 1433                         for (j = 0; j < allrates.rs_nrates; j++)
 1434                                 if (allrates.rs_rates[j] == r)
 1435                                         break;
 1436                         if (j == allrates.rs_nrates) {
 1437                                 /* unique, add to the set */
 1438                                 allrates.rs_rates[j] = r;
 1439                                 allrates.rs_nrates++;
 1440                         }
 1441                         rate = (rate & IEEE80211_RATE_VAL) / 2;
 1442                         if (rate > maxrate)
 1443                                 maxrate = rate;
 1444                 }
 1445         }
 1446         for (i = 0; i < allrates.rs_nrates; i++) {
 1447                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
 1448                                 IEEE80211_MODE_AUTO);
 1449                 if (mword == 0)
 1450                         continue;
 1451                 /* NB: remove media options from mword */
 1452                 addmedia(media, caps, addsta,
 1453                     IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
 1454         }
 1455         /*
 1456          * Add HT/11n media.  Note that we do not have enough
 1457          * bits in the media subtype to express the MCS so we
 1458          * use a "placeholder" media subtype and any fixed MCS
 1459          * must be specified with a different mechanism.
 1460          */
 1461         for (; mode <= IEEE80211_MODE_11NG; mode++) {
 1462                 if (isclr(ic->ic_modecaps, mode))
 1463                         continue;
 1464                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1465                 addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
 1466         }
 1467         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
 1468             isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
 1469                 addmedia(media, caps, addsta,
 1470                     IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
 1471                 i = ic->ic_txstream * 8 - 1;
 1472                 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
 1473                     (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40))
 1474                         rate = ieee80211_htrates[i].ht40_rate_400ns;
 1475                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40))
 1476                         rate = ieee80211_htrates[i].ht40_rate_800ns;
 1477                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20))
 1478                         rate = ieee80211_htrates[i].ht20_rate_400ns;
 1479                 else
 1480                         rate = ieee80211_htrates[i].ht20_rate_800ns;
 1481                 if (rate > maxrate)
 1482                         maxrate = rate;
 1483         }
 1484         return maxrate;
 1485 }
 1486 
 1487 /* XXX inline or eliminate? */
 1488 const struct ieee80211_rateset *
 1489 ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
 1490 {
 1491         /* XXX does this work for 11ng basic rates? */
 1492         return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
 1493 }
 1494 
 1495 void
 1496 ieee80211_announce(struct ieee80211com *ic)
 1497 {
 1498         int i, rate, mword;
 1499         enum ieee80211_phymode mode;
 1500         const struct ieee80211_rateset *rs;
 1501 
 1502         /* NB: skip AUTO since it has no rates */
 1503         for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
 1504                 if (isclr(ic->ic_modecaps, mode))
 1505                         continue;
 1506                 ic_printf(ic, "%s rates: ", ieee80211_phymode_name[mode]);
 1507                 rs = &ic->ic_sup_rates[mode];
 1508                 for (i = 0; i < rs->rs_nrates; i++) {
 1509                         mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
 1510                         if (mword == 0)
 1511                                 continue;
 1512                         rate = ieee80211_media2rate(mword);
 1513                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
 1514                             rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
 1515                 }
 1516                 printf("\n");
 1517         }
 1518         ieee80211_ht_announce(ic);
 1519 }
 1520 
 1521 void
 1522 ieee80211_announce_channels(struct ieee80211com *ic)
 1523 {
 1524         const struct ieee80211_channel *c;
 1525         char type;
 1526         int i, cw;
 1527 
 1528         printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
 1529         for (i = 0; i < ic->ic_nchans; i++) {
 1530                 c = &ic->ic_channels[i];
 1531                 if (IEEE80211_IS_CHAN_ST(c))
 1532                         type = 'S';
 1533                 else if (IEEE80211_IS_CHAN_108A(c))
 1534                         type = 'T';
 1535                 else if (IEEE80211_IS_CHAN_108G(c))
 1536                         type = 'G';
 1537                 else if (IEEE80211_IS_CHAN_HT(c))
 1538                         type = 'n';
 1539                 else if (IEEE80211_IS_CHAN_A(c))
 1540                         type = 'a';
 1541                 else if (IEEE80211_IS_CHAN_ANYG(c))
 1542                         type = 'g';
 1543                 else if (IEEE80211_IS_CHAN_B(c))
 1544                         type = 'b';
 1545                 else
 1546                         type = 'f';
 1547                 if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
 1548                         cw = 40;
 1549                 else if (IEEE80211_IS_CHAN_HALF(c))
 1550                         cw = 10;
 1551                 else if (IEEE80211_IS_CHAN_QUARTER(c))
 1552                         cw = 5;
 1553                 else
 1554                         cw = 20;
 1555                 printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
 1556                         , c->ic_ieee, c->ic_freq, type
 1557                         , cw
 1558                         , IEEE80211_IS_CHAN_HT40U(c) ? '+' :
 1559                           IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
 1560                         , c->ic_maxregpower
 1561                         , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
 1562                         , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
 1563                 );
 1564         }
 1565 }
 1566 
 1567 static int
 1568 media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
 1569 {
 1570         switch (IFM_MODE(ime->ifm_media)) {
 1571         case IFM_IEEE80211_11A:
 1572                 *mode = IEEE80211_MODE_11A;
 1573                 break;
 1574         case IFM_IEEE80211_11B:
 1575                 *mode = IEEE80211_MODE_11B;
 1576                 break;
 1577         case IFM_IEEE80211_11G:
 1578                 *mode = IEEE80211_MODE_11G;
 1579                 break;
 1580         case IFM_IEEE80211_FH:
 1581                 *mode = IEEE80211_MODE_FH;
 1582                 break;
 1583         case IFM_IEEE80211_11NA:
 1584                 *mode = IEEE80211_MODE_11NA;
 1585                 break;
 1586         case IFM_IEEE80211_11NG:
 1587                 *mode = IEEE80211_MODE_11NG;
 1588                 break;
 1589         case IFM_AUTO:
 1590                 *mode = IEEE80211_MODE_AUTO;
 1591                 break;
 1592         default:
 1593                 return 0;
 1594         }
 1595         /*
 1596          * Turbo mode is an ``option''.
 1597          * XXX does not apply to AUTO
 1598          */
 1599         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
 1600                 if (*mode == IEEE80211_MODE_11A) {
 1601                         if (flags & IEEE80211_F_TURBOP)
 1602                                 *mode = IEEE80211_MODE_TURBO_A;
 1603                         else
 1604                                 *mode = IEEE80211_MODE_STURBO_A;
 1605                 } else if (*mode == IEEE80211_MODE_11G)
 1606                         *mode = IEEE80211_MODE_TURBO_G;
 1607                 else
 1608                         return 0;
 1609         }
 1610         /* XXX HT40 +/- */
 1611         return 1;
 1612 }
 1613 
 1614 /*
 1615  * Handle a media change request on the vap interface.
 1616  */
 1617 int
 1618 ieee80211_media_change(struct ifnet *ifp)
 1619 {
 1620         struct ieee80211vap *vap = ifp->if_softc;
 1621         struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
 1622         uint16_t newmode;
 1623 
 1624         if (!media2mode(ime, vap->iv_flags, &newmode))
 1625                 return EINVAL;
 1626         if (vap->iv_des_mode != newmode) {
 1627                 vap->iv_des_mode = newmode;
 1628                 /* XXX kick state machine if up+running */
 1629         }
 1630         return 0;
 1631 }
 1632 
 1633 /*
 1634  * Common code to calculate the media status word
 1635  * from the operating mode and channel state.
 1636  */
 1637 static int
 1638 media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
 1639 {
 1640         int status;
 1641 
 1642         status = IFM_IEEE80211;
 1643         switch (opmode) {
 1644         case IEEE80211_M_STA:
 1645                 break;
 1646         case IEEE80211_M_IBSS:
 1647                 status |= IFM_IEEE80211_ADHOC;
 1648                 break;
 1649         case IEEE80211_M_HOSTAP:
 1650                 status |= IFM_IEEE80211_HOSTAP;
 1651                 break;
 1652         case IEEE80211_M_MONITOR:
 1653                 status |= IFM_IEEE80211_MONITOR;
 1654                 break;
 1655         case IEEE80211_M_AHDEMO:
 1656                 status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
 1657                 break;
 1658         case IEEE80211_M_WDS:
 1659                 status |= IFM_IEEE80211_WDS;
 1660                 break;
 1661         case IEEE80211_M_MBSS:
 1662                 status |= IFM_IEEE80211_MBSS;
 1663                 break;
 1664         }
 1665         if (IEEE80211_IS_CHAN_HTA(chan)) {
 1666                 status |= IFM_IEEE80211_11NA;
 1667         } else if (IEEE80211_IS_CHAN_HTG(chan)) {
 1668                 status |= IFM_IEEE80211_11NG;
 1669         } else if (IEEE80211_IS_CHAN_A(chan)) {
 1670                 status |= IFM_IEEE80211_11A;
 1671         } else if (IEEE80211_IS_CHAN_B(chan)) {
 1672                 status |= IFM_IEEE80211_11B;
 1673         } else if (IEEE80211_IS_CHAN_ANYG(chan)) {
 1674                 status |= IFM_IEEE80211_11G;
 1675         } else if (IEEE80211_IS_CHAN_FHSS(chan)) {
 1676                 status |= IFM_IEEE80211_FH;
 1677         }
 1678         /* XXX else complain? */
 1679 
 1680         if (IEEE80211_IS_CHAN_TURBO(chan))
 1681                 status |= IFM_IEEE80211_TURBO;
 1682 #if 0
 1683         if (IEEE80211_IS_CHAN_HT20(chan))
 1684                 status |= IFM_IEEE80211_HT20;
 1685         if (IEEE80211_IS_CHAN_HT40(chan))
 1686                 status |= IFM_IEEE80211_HT40;
 1687 #endif
 1688         return status;
 1689 }
 1690 
 1691 void
 1692 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1693 {
 1694         struct ieee80211vap *vap = ifp->if_softc;
 1695         struct ieee80211com *ic = vap->iv_ic;
 1696         enum ieee80211_phymode mode;
 1697 
 1698         imr->ifm_status = IFM_AVALID;
 1699         /*
 1700          * NB: use the current channel's mode to lock down a xmit
 1701          * rate only when running; otherwise we may have a mismatch
 1702          * in which case the rate will not be convertible.
 1703          */
 1704         if (vap->iv_state == IEEE80211_S_RUN ||
 1705             vap->iv_state == IEEE80211_S_SLEEP) {
 1706                 imr->ifm_status |= IFM_ACTIVE;
 1707                 mode = ieee80211_chan2mode(ic->ic_curchan);
 1708         } else
 1709                 mode = IEEE80211_MODE_AUTO;
 1710         imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
 1711         /*
 1712          * Calculate a current rate if possible.
 1713          */
 1714         if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
 1715                 /*
 1716                  * A fixed rate is set, report that.
 1717                  */
 1718                 imr->ifm_active |= ieee80211_rate2media(ic,
 1719                         vap->iv_txparms[mode].ucastrate, mode);
 1720         } else if (vap->iv_opmode == IEEE80211_M_STA) {
 1721                 /*
 1722                  * In station mode report the current transmit rate.
 1723                  */
 1724                 imr->ifm_active |= ieee80211_rate2media(ic,
 1725                         vap->iv_bss->ni_txrate, mode);
 1726         } else
 1727                 imr->ifm_active |= IFM_AUTO;
 1728         if (imr->ifm_status & IFM_ACTIVE)
 1729                 imr->ifm_current = imr->ifm_active;
 1730 }
 1731 
 1732 /*
 1733  * Set the current phy mode and recalculate the active channel
 1734  * set based on the available channels for this mode.  Also
 1735  * select a new default/current channel if the current one is
 1736  * inappropriate for this mode.
 1737  */
 1738 int
 1739 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
 1740 {
 1741         /*
 1742          * Adjust basic rates in 11b/11g supported rate set.
 1743          * Note that if operating on a hal/quarter rate channel
 1744          * this is a noop as those rates sets are different
 1745          * and used instead.
 1746          */
 1747         if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
 1748                 ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
 1749 
 1750         ic->ic_curmode = mode;
 1751         ieee80211_reset_erp(ic);        /* reset ERP state */
 1752 
 1753         return 0;
 1754 }
 1755 
 1756 /*
 1757  * Return the phy mode for with the specified channel.
 1758  */
 1759 enum ieee80211_phymode
 1760 ieee80211_chan2mode(const struct ieee80211_channel *chan)
 1761 {
 1762 
 1763         if (IEEE80211_IS_CHAN_HTA(chan))
 1764                 return IEEE80211_MODE_11NA;
 1765         else if (IEEE80211_IS_CHAN_HTG(chan))
 1766                 return IEEE80211_MODE_11NG;
 1767         else if (IEEE80211_IS_CHAN_108G(chan))
 1768                 return IEEE80211_MODE_TURBO_G;
 1769         else if (IEEE80211_IS_CHAN_ST(chan))
 1770                 return IEEE80211_MODE_STURBO_A;
 1771         else if (IEEE80211_IS_CHAN_TURBO(chan))
 1772                 return IEEE80211_MODE_TURBO_A;
 1773         else if (IEEE80211_IS_CHAN_HALF(chan))
 1774                 return IEEE80211_MODE_HALF;
 1775         else if (IEEE80211_IS_CHAN_QUARTER(chan))
 1776                 return IEEE80211_MODE_QUARTER;
 1777         else if (IEEE80211_IS_CHAN_A(chan))
 1778                 return IEEE80211_MODE_11A;
 1779         else if (IEEE80211_IS_CHAN_ANYG(chan))
 1780                 return IEEE80211_MODE_11G;
 1781         else if (IEEE80211_IS_CHAN_B(chan))
 1782                 return IEEE80211_MODE_11B;
 1783         else if (IEEE80211_IS_CHAN_FHSS(chan))
 1784                 return IEEE80211_MODE_FH;
 1785 
 1786         /* NB: should not get here */
 1787         printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
 1788                 __func__, chan->ic_freq, chan->ic_flags);
 1789         return IEEE80211_MODE_11B;
 1790 }
 1791 
 1792 struct ratemedia {
 1793         u_int   match;  /* rate + mode */
 1794         u_int   media;  /* if_media rate */
 1795 };
 1796 
 1797 static int
 1798 findmedia(const struct ratemedia rates[], int n, u_int match)
 1799 {
 1800         int i;
 1801 
 1802         for (i = 0; i < n; i++)
 1803                 if (rates[i].match == match)
 1804                         return rates[i].media;
 1805         return IFM_AUTO;
 1806 }
 1807 
 1808 /*
 1809  * Convert IEEE80211 rate value to ifmedia subtype.
 1810  * Rate is either a legacy rate in units of 0.5Mbps
 1811  * or an MCS index.
 1812  */
 1813 int
 1814 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
 1815 {
 1816         static const struct ratemedia rates[] = {
 1817                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
 1818                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
 1819                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
 1820                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
 1821                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
 1822                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
 1823                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
 1824                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
 1825                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
 1826                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
 1827                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
 1828                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
 1829                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
 1830                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
 1831                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
 1832                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
 1833                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
 1834                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
 1835                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
 1836                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
 1837                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
 1838                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
 1839                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
 1840                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
 1841                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
 1842                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
 1843                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
 1844                 {   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
 1845                 {   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
 1846                 {  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
 1847                 /* NB: OFDM72 doesn't really exist so we don't handle it */
 1848         };
 1849         static const struct ratemedia htrates[] = {
 1850                 {   0, IFM_IEEE80211_MCS },
 1851                 {   1, IFM_IEEE80211_MCS },
 1852                 {   2, IFM_IEEE80211_MCS },
 1853                 {   3, IFM_IEEE80211_MCS },
 1854                 {   4, IFM_IEEE80211_MCS },
 1855                 {   5, IFM_IEEE80211_MCS },
 1856                 {   6, IFM_IEEE80211_MCS },
 1857                 {   7, IFM_IEEE80211_MCS },
 1858                 {   8, IFM_IEEE80211_MCS },
 1859                 {   9, IFM_IEEE80211_MCS },
 1860                 {  10, IFM_IEEE80211_MCS },
 1861                 {  11, IFM_IEEE80211_MCS },
 1862                 {  12, IFM_IEEE80211_MCS },
 1863                 {  13, IFM_IEEE80211_MCS },
 1864                 {  14, IFM_IEEE80211_MCS },
 1865                 {  15, IFM_IEEE80211_MCS },
 1866                 {  16, IFM_IEEE80211_MCS },
 1867                 {  17, IFM_IEEE80211_MCS },
 1868                 {  18, IFM_IEEE80211_MCS },
 1869                 {  19, IFM_IEEE80211_MCS },
 1870                 {  20, IFM_IEEE80211_MCS },
 1871                 {  21, IFM_IEEE80211_MCS },
 1872                 {  22, IFM_IEEE80211_MCS },
 1873                 {  23, IFM_IEEE80211_MCS },
 1874                 {  24, IFM_IEEE80211_MCS },
 1875                 {  25, IFM_IEEE80211_MCS },
 1876                 {  26, IFM_IEEE80211_MCS },
 1877                 {  27, IFM_IEEE80211_MCS },
 1878                 {  28, IFM_IEEE80211_MCS },
 1879                 {  29, IFM_IEEE80211_MCS },
 1880                 {  30, IFM_IEEE80211_MCS },
 1881                 {  31, IFM_IEEE80211_MCS },
 1882                 {  32, IFM_IEEE80211_MCS },
 1883                 {  33, IFM_IEEE80211_MCS },
 1884                 {  34, IFM_IEEE80211_MCS },
 1885                 {  35, IFM_IEEE80211_MCS },
 1886                 {  36, IFM_IEEE80211_MCS },
 1887                 {  37, IFM_IEEE80211_MCS },
 1888                 {  38, IFM_IEEE80211_MCS },
 1889                 {  39, IFM_IEEE80211_MCS },
 1890                 {  40, IFM_IEEE80211_MCS },
 1891                 {  41, IFM_IEEE80211_MCS },
 1892                 {  42, IFM_IEEE80211_MCS },
 1893                 {  43, IFM_IEEE80211_MCS },
 1894                 {  44, IFM_IEEE80211_MCS },
 1895                 {  45, IFM_IEEE80211_MCS },
 1896                 {  46, IFM_IEEE80211_MCS },
 1897                 {  47, IFM_IEEE80211_MCS },
 1898                 {  48, IFM_IEEE80211_MCS },
 1899                 {  49, IFM_IEEE80211_MCS },
 1900                 {  50, IFM_IEEE80211_MCS },
 1901                 {  51, IFM_IEEE80211_MCS },
 1902                 {  52, IFM_IEEE80211_MCS },
 1903                 {  53, IFM_IEEE80211_MCS },
 1904                 {  54, IFM_IEEE80211_MCS },
 1905                 {  55, IFM_IEEE80211_MCS },
 1906                 {  56, IFM_IEEE80211_MCS },
 1907                 {  57, IFM_IEEE80211_MCS },
 1908                 {  58, IFM_IEEE80211_MCS },
 1909                 {  59, IFM_IEEE80211_MCS },
 1910                 {  60, IFM_IEEE80211_MCS },
 1911                 {  61, IFM_IEEE80211_MCS },
 1912                 {  62, IFM_IEEE80211_MCS },
 1913                 {  63, IFM_IEEE80211_MCS },
 1914                 {  64, IFM_IEEE80211_MCS },
 1915                 {  65, IFM_IEEE80211_MCS },
 1916                 {  66, IFM_IEEE80211_MCS },
 1917                 {  67, IFM_IEEE80211_MCS },
 1918                 {  68, IFM_IEEE80211_MCS },
 1919                 {  69, IFM_IEEE80211_MCS },
 1920                 {  70, IFM_IEEE80211_MCS },
 1921                 {  71, IFM_IEEE80211_MCS },
 1922                 {  72, IFM_IEEE80211_MCS },
 1923                 {  73, IFM_IEEE80211_MCS },
 1924                 {  74, IFM_IEEE80211_MCS },
 1925                 {  75, IFM_IEEE80211_MCS },
 1926                 {  76, IFM_IEEE80211_MCS },
 1927         };
 1928         int m;
 1929 
 1930         /*
 1931          * Check 11n rates first for match as an MCS.
 1932          */
 1933         if (mode == IEEE80211_MODE_11NA) {
 1934                 if (rate & IEEE80211_RATE_MCS) {
 1935                         rate &= ~IEEE80211_RATE_MCS;
 1936                         m = findmedia(htrates, nitems(htrates), rate);
 1937                         if (m != IFM_AUTO)
 1938                                 return m | IFM_IEEE80211_11NA;
 1939                 }
 1940         } else if (mode == IEEE80211_MODE_11NG) {
 1941                 /* NB: 12 is ambiguous, it will be treated as an MCS */
 1942                 if (rate & IEEE80211_RATE_MCS) {
 1943                         rate &= ~IEEE80211_RATE_MCS;
 1944                         m = findmedia(htrates, nitems(htrates), rate);
 1945                         if (m != IFM_AUTO)
 1946                                 return m | IFM_IEEE80211_11NG;
 1947                 }
 1948         }
 1949         rate &= IEEE80211_RATE_VAL;
 1950         switch (mode) {
 1951         case IEEE80211_MODE_11A:
 1952         case IEEE80211_MODE_HALF:               /* XXX good 'nuf */
 1953         case IEEE80211_MODE_QUARTER:
 1954         case IEEE80211_MODE_11NA:
 1955         case IEEE80211_MODE_TURBO_A:
 1956         case IEEE80211_MODE_STURBO_A:
 1957                 return findmedia(rates, nitems(rates), 
 1958                     rate | IFM_IEEE80211_11A);
 1959         case IEEE80211_MODE_11B:
 1960                 return findmedia(rates, nitems(rates), 
 1961                     rate | IFM_IEEE80211_11B);
 1962         case IEEE80211_MODE_FH:
 1963                 return findmedia(rates, nitems(rates), 
 1964                     rate | IFM_IEEE80211_FH);
 1965         case IEEE80211_MODE_AUTO:
 1966                 /* NB: ic may be NULL for some drivers */
 1967                 if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
 1968                         return findmedia(rates, nitems(rates),
 1969                             rate | IFM_IEEE80211_FH);
 1970                 /* NB: hack, 11g matches both 11b+11a rates */
 1971                 /* fall thru... */
 1972         case IEEE80211_MODE_11G:
 1973         case IEEE80211_MODE_11NG:
 1974         case IEEE80211_MODE_TURBO_G:
 1975                 return findmedia(rates, nitems(rates), rate | IFM_IEEE80211_11G);
 1976         }
 1977         return IFM_AUTO;
 1978 }
 1979 
 1980 int
 1981 ieee80211_media2rate(int mword)
 1982 {
 1983         static const int ieeerates[] = {
 1984                 -1,             /* IFM_AUTO */
 1985                 0,              /* IFM_MANUAL */
 1986                 0,              /* IFM_NONE */
 1987                 2,              /* IFM_IEEE80211_FH1 */
 1988                 4,              /* IFM_IEEE80211_FH2 */
 1989                 2,              /* IFM_IEEE80211_DS1 */
 1990                 4,              /* IFM_IEEE80211_DS2 */
 1991                 11,             /* IFM_IEEE80211_DS5 */
 1992                 22,             /* IFM_IEEE80211_DS11 */
 1993                 44,             /* IFM_IEEE80211_DS22 */
 1994                 12,             /* IFM_IEEE80211_OFDM6 */
 1995                 18,             /* IFM_IEEE80211_OFDM9 */
 1996                 24,             /* IFM_IEEE80211_OFDM12 */
 1997                 36,             /* IFM_IEEE80211_OFDM18 */
 1998                 48,             /* IFM_IEEE80211_OFDM24 */
 1999                 72,             /* IFM_IEEE80211_OFDM36 */
 2000                 96,             /* IFM_IEEE80211_OFDM48 */
 2001                 108,            /* IFM_IEEE80211_OFDM54 */
 2002                 144,            /* IFM_IEEE80211_OFDM72 */
 2003                 0,              /* IFM_IEEE80211_DS354k */
 2004                 0,              /* IFM_IEEE80211_DS512k */
 2005                 6,              /* IFM_IEEE80211_OFDM3 */
 2006                 9,              /* IFM_IEEE80211_OFDM4 */
 2007                 54,             /* IFM_IEEE80211_OFDM27 */
 2008                 -1,             /* IFM_IEEE80211_MCS */
 2009         };
 2010         return IFM_SUBTYPE(mword) < nitems(ieeerates) ?
 2011                 ieeerates[IFM_SUBTYPE(mword)] : 0;
 2012 }
 2013 
 2014 /*
 2015  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 2016  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 2017  */
 2018 #define mix(a, b, c)                                                    \
 2019 do {                                                                    \
 2020         a -= b; a -= c; a ^= (c >> 13);                                 \
 2021         b -= c; b -= a; b ^= (a << 8);                                  \
 2022         c -= a; c -= b; c ^= (b >> 13);                                 \
 2023         a -= b; a -= c; a ^= (c >> 12);                                 \
 2024         b -= c; b -= a; b ^= (a << 16);                                 \
 2025         c -= a; c -= b; c ^= (b >> 5);                                  \
 2026         a -= b; a -= c; a ^= (c >> 3);                                  \
 2027         b -= c; b -= a; b ^= (a << 10);                                 \
 2028         c -= a; c -= b; c ^= (b >> 15);                                 \
 2029 } while (/*CONSTCOND*/0)
 2030 
 2031 uint32_t
 2032 ieee80211_mac_hash(const struct ieee80211com *ic,
 2033         const uint8_t addr[IEEE80211_ADDR_LEN])
 2034 {
 2035         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
 2036 
 2037         b += addr[5] << 8;
 2038         b += addr[4];
 2039         a += addr[3] << 24;
 2040         a += addr[2] << 16;
 2041         a += addr[1] << 8;
 2042         a += addr[0];
 2043 
 2044         mix(a, b, c);
 2045 
 2046         return c;
 2047 }
 2048 #undef mix
 2049 
 2050 char
 2051 ieee80211_channel_type_char(const struct ieee80211_channel *c)
 2052 {
 2053         if (IEEE80211_IS_CHAN_ST(c))
 2054                 return 'S';
 2055         if (IEEE80211_IS_CHAN_108A(c))
 2056                 return 'T';
 2057         if (IEEE80211_IS_CHAN_108G(c))
 2058                 return 'G';
 2059         if (IEEE80211_IS_CHAN_HT(c))
 2060                 return 'n';
 2061         if (IEEE80211_IS_CHAN_A(c))
 2062                 return 'a';
 2063         if (IEEE80211_IS_CHAN_ANYG(c))
 2064                 return 'g';
 2065         if (IEEE80211_IS_CHAN_B(c))
 2066                 return 'b';
 2067         return 'f';
 2068 }

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