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: stable/8/sys/net80211/ieee80211.c 215557 2010-11-20 12:24:26Z bschmidt $");
   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 
   39 #include <sys/socket.h>
   40 
   41 #include <net/if.h>
   42 #include <net/if_dl.h>
   43 #include <net/if_media.h>
   44 #include <net/if_types.h>
   45 #include <net/ethernet.h>
   46 
   47 #include <net80211/ieee80211_var.h>
   48 #include <net80211/ieee80211_regdomain.h>
   49 #ifdef IEEE80211_SUPPORT_SUPERG
   50 #include <net80211/ieee80211_superg.h>
   51 #endif
   52 #include <net80211/ieee80211_ratectl.h>
   53 
   54 #include <net/bpf.h>
   55 
   56 const char *ieee80211_phymode_name[IEEE80211_MODE_MAX] = {
   57         [IEEE80211_MODE_AUTO]     = "auto",
   58         [IEEE80211_MODE_11A]      = "11a",
   59         [IEEE80211_MODE_11B]      = "11b",
   60         [IEEE80211_MODE_11G]      = "11g",
   61         [IEEE80211_MODE_FH]       = "FH",
   62         [IEEE80211_MODE_TURBO_A]  = "turboA",
   63         [IEEE80211_MODE_TURBO_G]  = "turboG",
   64         [IEEE80211_MODE_STURBO_A] = "sturboA",
   65         [IEEE80211_MODE_HALF]     = "half",
   66         [IEEE80211_MODE_QUARTER]  = "quarter",
   67         [IEEE80211_MODE_11NA]     = "11na",
   68         [IEEE80211_MODE_11NG]     = "11ng",
   69 };
   70 /* map ieee80211_opmode to the corresponding capability bit */
   71 const int ieee80211_opcap[IEEE80211_OPMODE_MAX] = {
   72         [IEEE80211_M_IBSS]      = IEEE80211_C_IBSS,
   73         [IEEE80211_M_WDS]       = IEEE80211_C_WDS,
   74         [IEEE80211_M_STA]       = IEEE80211_C_STA,
   75         [IEEE80211_M_AHDEMO]    = IEEE80211_C_AHDEMO,
   76         [IEEE80211_M_HOSTAP]    = IEEE80211_C_HOSTAP,
   77         [IEEE80211_M_MONITOR]   = IEEE80211_C_MONITOR,
   78 #ifdef IEEE80211_SUPPORT_MESH
   79         [IEEE80211_M_MBSS]      = IEEE80211_C_MBSS,
   80 #endif
   81 };
   82 
   83 static const uint8_t ieee80211broadcastaddr[IEEE80211_ADDR_LEN] =
   84         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
   85 
   86 static  void ieee80211_syncflag_locked(struct ieee80211com *ic, int flag);
   87 static  void ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag);
   88 static  void ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag);
   89 static  int ieee80211_media_setup(struct ieee80211com *ic,
   90                 struct ifmedia *media, int caps, int addsta,
   91                 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
   92 static  void ieee80211com_media_status(struct ifnet *, struct ifmediareq *);
   93 static  int ieee80211com_media_change(struct ifnet *);
   94 static  int media_status(enum ieee80211_opmode,
   95                 const struct ieee80211_channel *);
   96 
   97 MALLOC_DEFINE(M_80211_VAP, "80211vap", "802.11 vap state");
   98 
   99 /*
  100  * Default supported rates for 802.11 operation (in IEEE .5Mb units).
  101  */
  102 #define B(r)    ((r) | IEEE80211_RATE_BASIC)
  103 static const struct ieee80211_rateset ieee80211_rateset_11a =
  104         { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } };
  105 static const struct ieee80211_rateset ieee80211_rateset_half =
  106         { 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } };
  107 static const struct ieee80211_rateset ieee80211_rateset_quarter =
  108         { 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } };
  109 static const struct ieee80211_rateset ieee80211_rateset_11b =
  110         { 4, { B(2), B(4), B(11), B(22) } };
  111 /* NB: OFDM rates are handled specially based on mode */
  112 static const struct ieee80211_rateset ieee80211_rateset_11g =
  113         { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } };
  114 #undef B
  115 
  116 /*
  117  * Fill in 802.11 available channel set, mark
  118  * all available channels as active, and pick
  119  * a default channel if not already specified.
  120  */
  121 static void
  122 ieee80211_chan_init(struct ieee80211com *ic)
  123 {
  124 #define DEFAULTRATES(m, def) do { \
  125         if (ic->ic_sup_rates[m].rs_nrates == 0) \
  126                 ic->ic_sup_rates[m] = def; \
  127 } while (0)
  128         struct ieee80211_channel *c;
  129         int i;
  130 
  131         KASSERT(0 < ic->ic_nchans && ic->ic_nchans <= IEEE80211_CHAN_MAX,
  132                 ("invalid number of channels specified: %u", ic->ic_nchans));
  133         memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
  134         memset(ic->ic_modecaps, 0, sizeof(ic->ic_modecaps));
  135         setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO);
  136         for (i = 0; i < ic->ic_nchans; i++) {
  137                 c = &ic->ic_channels[i];
  138                 KASSERT(c->ic_flags != 0, ("channel with no flags"));
  139                 /*
  140                  * Help drivers that work only with frequencies by filling
  141                  * in IEEE channel #'s if not already calculated.  Note this
  142                  * mimics similar work done in ieee80211_setregdomain when
  143                  * changing regulatory state.
  144                  */
  145                 if (c->ic_ieee == 0)
  146                         c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
  147                 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
  148                         c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
  149                             (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
  150                             c->ic_flags);
  151                 /* default max tx power to max regulatory */
  152                 if (c->ic_maxpower == 0)
  153                         c->ic_maxpower = 2*c->ic_maxregpower;
  154                 setbit(ic->ic_chan_avail, c->ic_ieee);
  155                 /*
  156                  * Identify mode capabilities.
  157                  */
  158                 if (IEEE80211_IS_CHAN_A(c))
  159                         setbit(ic->ic_modecaps, IEEE80211_MODE_11A);
  160                 if (IEEE80211_IS_CHAN_B(c))
  161                         setbit(ic->ic_modecaps, IEEE80211_MODE_11B);
  162                 if (IEEE80211_IS_CHAN_ANYG(c))
  163                         setbit(ic->ic_modecaps, IEEE80211_MODE_11G);
  164                 if (IEEE80211_IS_CHAN_FHSS(c))
  165                         setbit(ic->ic_modecaps, IEEE80211_MODE_FH);
  166                 if (IEEE80211_IS_CHAN_108A(c))
  167                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A);
  168                 if (IEEE80211_IS_CHAN_108G(c))
  169                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G);
  170                 if (IEEE80211_IS_CHAN_ST(c))
  171                         setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A);
  172                 if (IEEE80211_IS_CHAN_HALF(c))
  173                         setbit(ic->ic_modecaps, IEEE80211_MODE_HALF);
  174                 if (IEEE80211_IS_CHAN_QUARTER(c))
  175                         setbit(ic->ic_modecaps, IEEE80211_MODE_QUARTER);
  176                 if (IEEE80211_IS_CHAN_HTA(c))
  177                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NA);
  178                 if (IEEE80211_IS_CHAN_HTG(c))
  179                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NG);
  180         }
  181         /* initialize candidate channels to all available */
  182         memcpy(ic->ic_chan_active, ic->ic_chan_avail,
  183                 sizeof(ic->ic_chan_avail));
  184 
  185         /* sort channel table to allow lookup optimizations */
  186         ieee80211_sort_channels(ic->ic_channels, ic->ic_nchans);
  187 
  188         /* invalidate any previous state */
  189         ic->ic_bsschan = IEEE80211_CHAN_ANYC;
  190         ic->ic_prevchan = NULL;
  191         ic->ic_csa_newchan = NULL;
  192         /* arbitrarily pick the first channel */
  193         ic->ic_curchan = &ic->ic_channels[0];
  194         ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  195 
  196         /* fillin well-known rate sets if driver has not specified */
  197         DEFAULTRATES(IEEE80211_MODE_11B,         ieee80211_rateset_11b);
  198         DEFAULTRATES(IEEE80211_MODE_11G,         ieee80211_rateset_11g);
  199         DEFAULTRATES(IEEE80211_MODE_11A,         ieee80211_rateset_11a);
  200         DEFAULTRATES(IEEE80211_MODE_TURBO_A,     ieee80211_rateset_11a);
  201         DEFAULTRATES(IEEE80211_MODE_TURBO_G,     ieee80211_rateset_11g);
  202         DEFAULTRATES(IEEE80211_MODE_STURBO_A,    ieee80211_rateset_11a);
  203         DEFAULTRATES(IEEE80211_MODE_HALF,        ieee80211_rateset_half);
  204         DEFAULTRATES(IEEE80211_MODE_QUARTER,     ieee80211_rateset_quarter);
  205         DEFAULTRATES(IEEE80211_MODE_11NA,        ieee80211_rateset_11a);
  206         DEFAULTRATES(IEEE80211_MODE_11NG,        ieee80211_rateset_11g);
  207 
  208         /*
  209          * Set auto mode to reset active channel state and any desired channel.
  210          */
  211         (void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
  212 #undef DEFAULTRATES
  213 }
  214 
  215 static void
  216 null_update_mcast(struct ifnet *ifp)
  217 {
  218         if_printf(ifp, "need multicast update callback\n");
  219 }
  220 
  221 static void
  222 null_update_promisc(struct ifnet *ifp)
  223 {
  224         if_printf(ifp, "need promiscuous mode update callback\n");
  225 }
  226 
  227 static int
  228 null_transmit(struct ifnet *ifp, struct mbuf *m)
  229 {
  230         m_freem(m);
  231         ifp->if_oerrors++;
  232         return EACCES;          /* XXX EIO/EPERM? */
  233 }
  234 
  235 static int
  236 null_output(struct ifnet *ifp, struct mbuf *m,
  237         struct sockaddr *dst, struct route *ro)
  238 {
  239         if_printf(ifp, "discard raw packet\n");
  240         return null_transmit(ifp, m);
  241 }
  242 
  243 static void
  244 null_input(struct ifnet *ifp, struct mbuf *m)
  245 {
  246         if_printf(ifp, "if_input should not be called\n");
  247         m_freem(m);
  248 }
  249 
  250 /*
  251  * Attach/setup the common net80211 state.  Called by
  252  * the driver on attach to prior to creating any vap's.
  253  */
  254 void
  255 ieee80211_ifattach(struct ieee80211com *ic,
  256         const uint8_t macaddr[IEEE80211_ADDR_LEN])
  257 {
  258         struct ifnet *ifp = ic->ic_ifp;
  259         struct sockaddr_dl *sdl;
  260         struct ifaddr *ifa;
  261 
  262         KASSERT(ifp->if_type == IFT_IEEE80211, ("if_type %d", ifp->if_type));
  263 
  264         IEEE80211_LOCK_INIT(ic, ifp->if_xname);
  265         TAILQ_INIT(&ic->ic_vaps);
  266 
  267         /* Create a taskqueue for all state changes */
  268         ic->ic_tq = taskqueue_create("ic_taskq", M_WAITOK | M_ZERO,
  269             taskqueue_thread_enqueue, &ic->ic_tq);
  270         taskqueue_start_threads(&ic->ic_tq, 1, PI_NET, "%s taskq",
  271             ifp->if_xname);
  272         /*
  273          * Fill in 802.11 available channel set, mark all
  274          * available channels as active, and pick a default
  275          * channel if not already specified.
  276          */
  277         ieee80211_media_init(ic);
  278 
  279         ic->ic_update_mcast = null_update_mcast;
  280         ic->ic_update_promisc = null_update_promisc;
  281 
  282         ic->ic_hash_key = arc4random();
  283         ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
  284         ic->ic_lintval = ic->ic_bintval;
  285         ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
  286 
  287         ieee80211_crypto_attach(ic);
  288         ieee80211_node_attach(ic);
  289         ieee80211_power_attach(ic);
  290         ieee80211_proto_attach(ic);
  291 #ifdef IEEE80211_SUPPORT_SUPERG
  292         ieee80211_superg_attach(ic);
  293 #endif
  294         ieee80211_ht_attach(ic);
  295         ieee80211_scan_attach(ic);
  296         ieee80211_regdomain_attach(ic);
  297         ieee80211_dfs_attach(ic);
  298 
  299         ieee80211_sysctl_attach(ic);
  300 
  301         ifp->if_addrlen = IEEE80211_ADDR_LEN;
  302         ifp->if_hdrlen = 0;
  303         if_attach(ifp);
  304         ifp->if_mtu = IEEE80211_MTU_MAX;
  305         ifp->if_broadcastaddr = ieee80211broadcastaddr;
  306         ifp->if_output = null_output;
  307         ifp->if_input = null_input;     /* just in case */
  308         ifp->if_resolvemulti = NULL;    /* NB: callers check */
  309 
  310         ifa = ifaddr_byindex(ifp->if_index);
  311         KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
  312         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  313         sdl->sdl_type = IFT_ETHER;              /* XXX IFT_IEEE80211? */
  314         sdl->sdl_alen = IEEE80211_ADDR_LEN;
  315         IEEE80211_ADDR_COPY(LLADDR(sdl), macaddr);
  316         ifa_free(ifa);
  317 }
  318 
  319 /*
  320  * Detach net80211 state on device detach.  Tear down
  321  * all vap's and reclaim all common state prior to the
  322  * device state going away.  Note we may call back into
  323  * driver; it must be prepared for this.
  324  */
  325 void
  326 ieee80211_ifdetach(struct ieee80211com *ic)
  327 {
  328         struct ifnet *ifp = ic->ic_ifp;
  329         struct ieee80211vap *vap;
  330 
  331         if_detach(ifp);
  332 
  333         while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
  334                 ieee80211_vap_destroy(vap);
  335         ieee80211_waitfor_parent(ic);
  336 
  337         ieee80211_sysctl_detach(ic);
  338         ieee80211_dfs_detach(ic);
  339         ieee80211_regdomain_detach(ic);
  340         ieee80211_scan_detach(ic);
  341 #ifdef IEEE80211_SUPPORT_SUPERG
  342         ieee80211_superg_detach(ic);
  343 #endif
  344         ieee80211_ht_detach(ic);
  345         /* NB: must be called before ieee80211_node_detach */
  346         ieee80211_proto_detach(ic);
  347         ieee80211_crypto_detach(ic);
  348         ieee80211_power_detach(ic);
  349         ieee80211_node_detach(ic);
  350 
  351         ifmedia_removeall(&ic->ic_media);
  352         taskqueue_free(ic->ic_tq);
  353         IEEE80211_LOCK_DESTROY(ic);
  354 }
  355 
  356 /*
  357  * Default reset method for use with the ioctl support.  This
  358  * method is invoked after any state change in the 802.11
  359  * layer that should be propagated to the hardware but not
  360  * require re-initialization of the 802.11 state machine (e.g
  361  * rescanning for an ap).  We always return ENETRESET which
  362  * should cause the driver to re-initialize the device. Drivers
  363  * can override this method to implement more optimized support.
  364  */
  365 static int
  366 default_reset(struct ieee80211vap *vap, u_long cmd)
  367 {
  368         return ENETRESET;
  369 }
  370 
  371 /*
  372  * Prepare a vap for use.  Drivers use this call to
  373  * setup net80211 state in new vap's prior attaching
  374  * them with ieee80211_vap_attach (below).
  375  */
  376 int
  377 ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
  378         const char name[IFNAMSIZ], int unit, int opmode, int flags,
  379         const uint8_t bssid[IEEE80211_ADDR_LEN],
  380         const uint8_t macaddr[IEEE80211_ADDR_LEN])
  381 {
  382         struct ifnet *ifp;
  383 
  384         ifp = if_alloc(IFT_ETHER);
  385         if (ifp == NULL) {
  386                 if_printf(ic->ic_ifp, "%s: unable to allocate ifnet\n",
  387                     __func__);
  388                 return ENOMEM;
  389         }
  390         if_initname(ifp, name, unit);
  391         ifp->if_softc = vap;                    /* back pointer */
  392         ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
  393         ifp->if_start = ieee80211_start;
  394         ifp->if_ioctl = ieee80211_ioctl;
  395         ifp->if_init = ieee80211_init;
  396         /* NB: input+output filled in by ether_ifattach */
  397         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
  398         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
  399         IFQ_SET_READY(&ifp->if_snd);
  400 
  401         vap->iv_ifp = ifp;
  402         vap->iv_ic = ic;
  403         vap->iv_flags = ic->ic_flags;           /* propagate common flags */
  404         vap->iv_flags_ext = ic->ic_flags_ext;
  405         vap->iv_flags_ven = ic->ic_flags_ven;
  406         vap->iv_caps = ic->ic_caps &~ IEEE80211_C_OPMODE;
  407         vap->iv_htcaps = ic->ic_htcaps;
  408         vap->iv_opmode = opmode;
  409         vap->iv_caps |= ieee80211_opcap[opmode];
  410         switch (opmode) {
  411         case IEEE80211_M_WDS:
  412                 /*
  413                  * WDS links must specify the bssid of the far end.
  414                  * For legacy operation this is a static relationship.
  415                  * For non-legacy operation the station must associate
  416                  * and be authorized to pass traffic.  Plumbing the
  417                  * vap to the proper node happens when the vap
  418                  * transitions to RUN state.
  419                  */
  420                 IEEE80211_ADDR_COPY(vap->iv_des_bssid, bssid);
  421                 vap->iv_flags |= IEEE80211_F_DESBSSID;
  422                 if (flags & IEEE80211_CLONE_WDSLEGACY)
  423                         vap->iv_flags_ext |= IEEE80211_FEXT_WDSLEGACY;
  424                 break;
  425 #ifdef IEEE80211_SUPPORT_TDMA
  426         case IEEE80211_M_AHDEMO:
  427                 if (flags & IEEE80211_CLONE_TDMA) {
  428                         /* NB: checked before clone operation allowed */
  429                         KASSERT(ic->ic_caps & IEEE80211_C_TDMA,
  430                             ("not TDMA capable, ic_caps 0x%x", ic->ic_caps));
  431                         /*
  432                          * Propagate TDMA capability to mark vap; this
  433                          * cannot be removed and is used to distinguish
  434                          * regular ahdemo operation from ahdemo+tdma.
  435                          */
  436                         vap->iv_caps |= IEEE80211_C_TDMA;
  437                 }
  438                 break;
  439 #endif
  440         }
  441         /* auto-enable s/w beacon miss support */
  442         if (flags & IEEE80211_CLONE_NOBEACONS)
  443                 vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
  444         /* auto-generated or user supplied MAC address */
  445         if (flags & (IEEE80211_CLONE_BSSID|IEEE80211_CLONE_MACADDR))
  446                 vap->iv_flags_ext |= IEEE80211_FEXT_UNIQMAC;
  447         /*
  448          * Enable various functionality by default if we're
  449          * capable; the driver can override us if it knows better.
  450          */
  451         if (vap->iv_caps & IEEE80211_C_WME)
  452                 vap->iv_flags |= IEEE80211_F_WME;
  453         if (vap->iv_caps & IEEE80211_C_BURST)
  454                 vap->iv_flags |= IEEE80211_F_BURST;
  455         /* NB: bg scanning only makes sense for station mode right now */
  456         if (vap->iv_opmode == IEEE80211_M_STA &&
  457             (vap->iv_caps & IEEE80211_C_BGSCAN))
  458                 vap->iv_flags |= IEEE80211_F_BGSCAN;
  459         vap->iv_flags |= IEEE80211_F_DOTH;      /* XXX no cap, just ena */
  460         /* NB: DFS support only makes sense for ap mode right now */
  461         if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
  462             (vap->iv_caps & IEEE80211_C_DFS))
  463                 vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
  464 
  465         vap->iv_des_chan = IEEE80211_CHAN_ANYC;         /* any channel is ok */
  466         vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
  467         vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
  468         /*
  469          * Install a default reset method for the ioctl support;
  470          * the driver can override this.
  471          */
  472         vap->iv_reset = default_reset;
  473 
  474         IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);
  475 
  476         ieee80211_sysctl_vattach(vap);
  477         ieee80211_crypto_vattach(vap);
  478         ieee80211_node_vattach(vap);
  479         ieee80211_power_vattach(vap);
  480         ieee80211_proto_vattach(vap);
  481 #ifdef IEEE80211_SUPPORT_SUPERG
  482         ieee80211_superg_vattach(vap);
  483 #endif
  484         ieee80211_ht_vattach(vap);
  485         ieee80211_scan_vattach(vap);
  486         ieee80211_regdomain_vattach(vap);
  487         ieee80211_radiotap_vattach(vap);
  488         ieee80211_ratectl_set(vap, IEEE80211_RATECTL_NONE);
  489 
  490         return 0;
  491 }
  492 
  493 /*
  494  * Activate a vap.  State should have been prepared with a
  495  * call to ieee80211_vap_setup and by the driver.  On return
  496  * from this call the vap is ready for use.
  497  */
  498 int
  499 ieee80211_vap_attach(struct ieee80211vap *vap,
  500         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  501 {
  502         struct ifnet *ifp = vap->iv_ifp;
  503         struct ieee80211com *ic = vap->iv_ic;
  504         struct ifmediareq imr;
  505         int maxrate;
  506 
  507         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  508             "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
  509             __func__, ieee80211_opmode_name[vap->iv_opmode],
  510             ic->ic_ifp->if_xname, vap->iv_flags, vap->iv_flags_ext);
  511 
  512         /*
  513          * Do late attach work that cannot happen until after
  514          * the driver has had a chance to override defaults.
  515          */
  516         ieee80211_node_latevattach(vap);
  517         ieee80211_power_latevattach(vap);
  518 
  519         maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
  520             vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
  521         ieee80211_media_status(ifp, &imr);
  522         /* NB: strip explicit mode; we're actually in autoselect */
  523         ifmedia_set(&vap->iv_media,
  524             imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
  525         if (maxrate)
  526                 ifp->if_baudrate = IF_Mbps(maxrate);
  527 
  528         ether_ifattach(ifp, vap->iv_myaddr);
  529         if (vap->iv_opmode == IEEE80211_M_MONITOR) {
  530                 /* NB: disallow transmit */
  531                 ifp->if_transmit = null_transmit;
  532                 ifp->if_output = null_output;
  533         } else {
  534                 /* hook output method setup by ether_ifattach */
  535                 vap->iv_output = ifp->if_output;
  536                 ifp->if_output = ieee80211_output;
  537         }
  538         /* NB: if_mtu set by ether_ifattach to ETHERMTU */
  539 
  540         IEEE80211_LOCK(ic);
  541         TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
  542         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  543 #ifdef IEEE80211_SUPPORT_SUPERG
  544         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  545 #endif
  546         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  547         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  548         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  549         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  550         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  551         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  552         IEEE80211_UNLOCK(ic);
  553 
  554         return 1;
  555 }
  556 
  557 /* 
  558  * Tear down vap state and reclaim the ifnet.
  559  * The driver is assumed to have prepared for
  560  * this; e.g. by turning off interrupts for the
  561  * underlying device.
  562  */
  563 void
  564 ieee80211_vap_detach(struct ieee80211vap *vap)
  565 {
  566         struct ieee80211com *ic = vap->iv_ic;
  567         struct ifnet *ifp = vap->iv_ifp;
  568 
  569         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
  570             __func__, ieee80211_opmode_name[vap->iv_opmode],
  571             ic->ic_ifp->if_xname);
  572 
  573         /* NB: bpfdetach is called by ether_ifdetach and claims all taps */
  574         ether_ifdetach(ifp);
  575 
  576         ieee80211_stop(vap);
  577 
  578         /*
  579          * Flush any deferred vap tasks.
  580          */
  581         ieee80211_draintask(ic, &vap->iv_nstate_task);
  582         ieee80211_draintask(ic, &vap->iv_swbmiss_task);
  583 
  584         /* XXX band-aid until ifnet handles this for us */
  585         taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
  586 
  587         IEEE80211_LOCK(ic);
  588         KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
  589         TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
  590         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  591 #ifdef IEEE80211_SUPPORT_SUPERG
  592         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  593 #endif
  594         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  595         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  596         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  597         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  598         /* NB: this handles the bpfdetach done below */
  599         ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
  600         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  601         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  602         IEEE80211_UNLOCK(ic);
  603 
  604         ifmedia_removeall(&vap->iv_media);
  605 
  606         ieee80211_radiotap_vdetach(vap);
  607         ieee80211_regdomain_vdetach(vap);
  608         ieee80211_scan_vdetach(vap);
  609 #ifdef IEEE80211_SUPPORT_SUPERG
  610         ieee80211_superg_vdetach(vap);
  611 #endif
  612         ieee80211_ht_vdetach(vap);
  613         /* NB: must be before ieee80211_node_vdetach */
  614         ieee80211_proto_vdetach(vap);
  615         ieee80211_crypto_vdetach(vap);
  616         ieee80211_power_vdetach(vap);
  617         ieee80211_node_vdetach(vap);
  618         ieee80211_sysctl_vdetach(vap);
  619 
  620         if_free(ifp);
  621 }
  622 
  623 /*
  624  * Synchronize flag bit state in the parent ifnet structure
  625  * according to the state of all vap ifnet's.  This is used,
  626  * for example, to handle IFF_PROMISC and IFF_ALLMULTI.
  627  */
  628 void
  629 ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
  630 {
  631         struct ifnet *ifp = ic->ic_ifp;
  632         struct ieee80211vap *vap;
  633         int bit, oflags;
  634 
  635         IEEE80211_LOCK_ASSERT(ic);
  636 
  637         bit = 0;
  638         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  639                 if (vap->iv_ifp->if_flags & flag) {
  640                         /*
  641                          * XXX the bridge sets PROMISC but we don't want to
  642                          * enable it on the device, discard here so all the
  643                          * drivers don't need to special-case it
  644                          */
  645                         if (flag == IFF_PROMISC &&
  646                             !(vap->iv_opmode == IEEE80211_M_MONITOR ||
  647                               (vap->iv_opmode == IEEE80211_M_AHDEMO &&
  648                                (vap->iv_caps & IEEE80211_C_TDMA) == 0)))
  649                                 continue;
  650                         bit = 1;
  651                         break;
  652                 }
  653         oflags = ifp->if_flags;
  654         if (bit)
  655                 ifp->if_flags |= flag;
  656         else
  657                 ifp->if_flags &= ~flag;
  658         if ((ifp->if_flags ^ oflags) & flag) {
  659                 /* XXX should we return 1/0 and let caller do this? */
  660                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  661                         if (flag == IFF_PROMISC)
  662                                 ieee80211_runtask(ic, &ic->ic_promisc_task);
  663                         else if (flag == IFF_ALLMULTI)
  664                                 ieee80211_runtask(ic, &ic->ic_mcast_task);
  665                 }
  666         }
  667 }
  668 
  669 /*
  670  * Synchronize flag bit state in the com structure
  671  * according to the state of all vap's.  This is used,
  672  * for example, to handle state changes via ioctls.
  673  */
  674 static void
  675 ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
  676 {
  677         struct ieee80211vap *vap;
  678         int bit;
  679 
  680         IEEE80211_LOCK_ASSERT(ic);
  681 
  682         bit = 0;
  683         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  684                 if (vap->iv_flags & flag) {
  685                         bit = 1;
  686                         break;
  687                 }
  688         if (bit)
  689                 ic->ic_flags |= flag;
  690         else
  691                 ic->ic_flags &= ~flag;
  692 }
  693 
  694 void
  695 ieee80211_syncflag(struct ieee80211vap *vap, int flag)
  696 {
  697         struct ieee80211com *ic = vap->iv_ic;
  698 
  699         IEEE80211_LOCK(ic);
  700         if (flag < 0) {
  701                 flag = -flag;
  702                 vap->iv_flags &= ~flag;
  703         } else
  704                 vap->iv_flags |= flag;
  705         ieee80211_syncflag_locked(ic, flag);
  706         IEEE80211_UNLOCK(ic);
  707 }
  708 
  709 /*
  710  * Synchronize flags_ht bit state in the com structure
  711  * according to the state of all vap's.  This is used,
  712  * for example, to handle state changes via ioctls.
  713  */
  714 static void
  715 ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
  716 {
  717         struct ieee80211vap *vap;
  718         int bit;
  719 
  720         IEEE80211_LOCK_ASSERT(ic);
  721 
  722         bit = 0;
  723         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  724                 if (vap->iv_flags_ht & flag) {
  725                         bit = 1;
  726                         break;
  727                 }
  728         if (bit)
  729                 ic->ic_flags_ht |= flag;
  730         else
  731                 ic->ic_flags_ht &= ~flag;
  732 }
  733 
  734 void
  735 ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
  736 {
  737         struct ieee80211com *ic = vap->iv_ic;
  738 
  739         IEEE80211_LOCK(ic);
  740         if (flag < 0) {
  741                 flag = -flag;
  742                 vap->iv_flags_ht &= ~flag;
  743         } else
  744                 vap->iv_flags_ht |= flag;
  745         ieee80211_syncflag_ht_locked(ic, flag);
  746         IEEE80211_UNLOCK(ic);
  747 }
  748 
  749 /*
  750  * Synchronize flags_ext bit state in the com structure
  751  * according to the state of all vap's.  This is used,
  752  * for example, to handle state changes via ioctls.
  753  */
  754 static void
  755 ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
  756 {
  757         struct ieee80211vap *vap;
  758         int bit;
  759 
  760         IEEE80211_LOCK_ASSERT(ic);
  761 
  762         bit = 0;
  763         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  764                 if (vap->iv_flags_ext & flag) {
  765                         bit = 1;
  766                         break;
  767                 }
  768         if (bit)
  769                 ic->ic_flags_ext |= flag;
  770         else
  771                 ic->ic_flags_ext &= ~flag;
  772 }
  773 
  774 void
  775 ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
  776 {
  777         struct ieee80211com *ic = vap->iv_ic;
  778 
  779         IEEE80211_LOCK(ic);
  780         if (flag < 0) {
  781                 flag = -flag;
  782                 vap->iv_flags_ext &= ~flag;
  783         } else
  784                 vap->iv_flags_ext |= flag;
  785         ieee80211_syncflag_ext_locked(ic, flag);
  786         IEEE80211_UNLOCK(ic);
  787 }
  788 
  789 static __inline int
  790 mapgsm(u_int freq, u_int flags)
  791 {
  792         freq *= 10;
  793         if (flags & IEEE80211_CHAN_QUARTER)
  794                 freq += 5;
  795         else if (flags & IEEE80211_CHAN_HALF)
  796                 freq += 10;
  797         else
  798                 freq += 20;
  799         /* NB: there is no 907/20 wide but leave room */
  800         return (freq - 906*10) / 5;
  801 }
  802 
  803 static __inline int
  804 mappsb(u_int freq, u_int flags)
  805 {
  806         return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
  807 }
  808 
  809 /*
  810  * Convert MHz frequency to IEEE channel number.
  811  */
  812 int
  813 ieee80211_mhz2ieee(u_int freq, u_int flags)
  814 {
  815 #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
  816         if (flags & IEEE80211_CHAN_GSM)
  817                 return mapgsm(freq, flags);
  818         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  819                 if (freq == 2484)
  820                         return 14;
  821                 if (freq < 2484)
  822                         return ((int) freq - 2407) / 5;
  823                 else
  824                         return 15 + ((freq - 2512) / 20);
  825         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  826                 if (freq <= 5000) {
  827                         /* XXX check regdomain? */
  828                         if (IS_FREQ_IN_PSB(freq))
  829                                 return mappsb(freq, flags);
  830                         return (freq - 4000) / 5;
  831                 } else
  832                         return (freq - 5000) / 5;
  833         } else {                                /* either, guess */
  834                 if (freq == 2484)
  835                         return 14;
  836                 if (freq < 2484) {
  837                         if (907 <= freq && freq <= 922)
  838                                 return mapgsm(freq, flags);
  839                         return ((int) freq - 2407) / 5;
  840                 }
  841                 if (freq < 5000) {
  842                         if (IS_FREQ_IN_PSB(freq))
  843                                 return mappsb(freq, flags);
  844                         else if (freq > 4900)
  845                                 return (freq - 4000) / 5;
  846                         else
  847                                 return 15 + ((freq - 2512) / 20);
  848                 }
  849                 return (freq - 5000) / 5;
  850         }
  851 #undef IS_FREQ_IN_PSB
  852 }
  853 
  854 /*
  855  * Convert channel to IEEE channel number.
  856  */
  857 int
  858 ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
  859 {
  860         if (c == NULL) {
  861                 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
  862                 return 0;               /* XXX */
  863         }
  864         return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
  865 }
  866 
  867 /*
  868  * Convert IEEE channel number to MHz frequency.
  869  */
  870 u_int
  871 ieee80211_ieee2mhz(u_int chan, u_int flags)
  872 {
  873         if (flags & IEEE80211_CHAN_GSM)
  874                 return 907 + 5 * (chan / 10);
  875         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  876                 if (chan == 14)
  877                         return 2484;
  878                 if (chan < 14)
  879                         return 2407 + chan*5;
  880                 else
  881                         return 2512 + ((chan-15)*20);
  882         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  883                 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
  884                         chan -= 37;
  885                         return 4940 + chan*5 + (chan % 5 ? 2 : 0);
  886                 }
  887                 return 5000 + (chan*5);
  888         } else {                                /* either, guess */
  889                 /* XXX can't distinguish PSB+GSM channels */
  890                 if (chan == 14)
  891                         return 2484;
  892                 if (chan < 14)                  /* 0-13 */
  893                         return 2407 + chan*5;
  894                 if (chan < 27)                  /* 15-26 */
  895                         return 2512 + ((chan-15)*20);
  896                 return 5000 + (chan*5);
  897         }
  898 }
  899 
  900 /*
  901  * Locate a channel given a frequency+flags.  We cache
  902  * the previous lookup to optimize switching between two
  903  * channels--as happens with dynamic turbo.
  904  */
  905 struct ieee80211_channel *
  906 ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
  907 {
  908         struct ieee80211_channel *c;
  909         int i;
  910 
  911         flags &= IEEE80211_CHAN_ALLTURBO;
  912         c = ic->ic_prevchan;
  913         if (c != NULL && c->ic_freq == freq &&
  914             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  915                 return c;
  916         /* brute force search */
  917         for (i = 0; i < ic->ic_nchans; i++) {
  918                 c = &ic->ic_channels[i];
  919                 if (c->ic_freq == freq &&
  920                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  921                         return c;
  922         }
  923         return NULL;
  924 }
  925 
  926 /*
  927  * Locate a channel given a channel number+flags.  We cache
  928  * the previous lookup to optimize switching between two
  929  * channels--as happens with dynamic turbo.
  930  */
  931 struct ieee80211_channel *
  932 ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
  933 {
  934         struct ieee80211_channel *c;
  935         int i;
  936 
  937         flags &= IEEE80211_CHAN_ALLTURBO;
  938         c = ic->ic_prevchan;
  939         if (c != NULL && c->ic_ieee == ieee &&
  940             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  941                 return c;
  942         /* brute force search */
  943         for (i = 0; i < ic->ic_nchans; i++) {
  944                 c = &ic->ic_channels[i];
  945                 if (c->ic_ieee == ieee &&
  946                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  947                         return c;
  948         }
  949         return NULL;
  950 }
  951 
  952 static void
  953 addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
  954 {
  955 #define ADD(_ic, _s, _o) \
  956         ifmedia_add(media, \
  957                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
  958         static const u_int mopts[IEEE80211_MODE_MAX] = { 
  959             [IEEE80211_MODE_AUTO]       = IFM_AUTO,
  960             [IEEE80211_MODE_11A]        = IFM_IEEE80211_11A,
  961             [IEEE80211_MODE_11B]        = IFM_IEEE80211_11B,
  962             [IEEE80211_MODE_11G]        = IFM_IEEE80211_11G,
  963             [IEEE80211_MODE_FH]         = IFM_IEEE80211_FH,
  964             [IEEE80211_MODE_TURBO_A]    = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  965             [IEEE80211_MODE_TURBO_G]    = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
  966             [IEEE80211_MODE_STURBO_A]   = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  967             [IEEE80211_MODE_HALF]       = IFM_IEEE80211_11A,    /* XXX */
  968             [IEEE80211_MODE_QUARTER]    = IFM_IEEE80211_11A,    /* XXX */
  969             [IEEE80211_MODE_11NA]       = IFM_IEEE80211_11NA,
  970             [IEEE80211_MODE_11NG]       = IFM_IEEE80211_11NG,
  971         };
  972         u_int mopt;
  973 
  974         mopt = mopts[mode];
  975         if (addsta)
  976                 ADD(ic, mword, mopt);   /* STA mode has no cap */
  977         if (caps & IEEE80211_C_IBSS)
  978                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
  979         if (caps & IEEE80211_C_HOSTAP)
  980                 ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
  981         if (caps & IEEE80211_C_AHDEMO)
  982                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  983         if (caps & IEEE80211_C_MONITOR)
  984                 ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
  985         if (caps & IEEE80211_C_WDS)
  986                 ADD(media, mword, mopt | IFM_IEEE80211_WDS);
  987         if (caps & IEEE80211_C_MBSS)
  988                 ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
  989 #undef ADD
  990 }
  991 
  992 /*
  993  * Setup the media data structures according to the channel and
  994  * rate tables.
  995  */
  996 static int
  997 ieee80211_media_setup(struct ieee80211com *ic,
  998         struct ifmedia *media, int caps, int addsta,
  999         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
 1000 {
 1001         int i, j, mode, rate, maxrate, mword, r;
 1002         const struct ieee80211_rateset *rs;
 1003         struct ieee80211_rateset allrates;
 1004 
 1005         /*
 1006          * Fill in media characteristics.
 1007          */
 1008         ifmedia_init(media, 0, media_change, media_stat);
 1009         maxrate = 0;
 1010         /*
 1011          * Add media for legacy operating modes.
 1012          */
 1013         memset(&allrates, 0, sizeof(allrates));
 1014         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
 1015                 if (isclr(ic->ic_modecaps, mode))
 1016                         continue;
 1017                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1018                 if (mode == IEEE80211_MODE_AUTO)
 1019                         continue;
 1020                 rs = &ic->ic_sup_rates[mode];
 1021                 for (i = 0; i < rs->rs_nrates; i++) {
 1022                         rate = rs->rs_rates[i];
 1023                         mword = ieee80211_rate2media(ic, rate, mode);
 1024                         if (mword == 0)
 1025                                 continue;
 1026                         addmedia(media, caps, addsta, mode, mword);
 1027                         /*
 1028                          * Add legacy rate to the collection of all rates.
 1029                          */
 1030                         r = rate & IEEE80211_RATE_VAL;
 1031                         for (j = 0; j < allrates.rs_nrates; j++)
 1032                                 if (allrates.rs_rates[j] == r)
 1033                                         break;
 1034                         if (j == allrates.rs_nrates) {
 1035                                 /* unique, add to the set */
 1036                                 allrates.rs_rates[j] = r;
 1037                                 allrates.rs_nrates++;
 1038                         }
 1039                         rate = (rate & IEEE80211_RATE_VAL) / 2;
 1040                         if (rate > maxrate)
 1041                                 maxrate = rate;
 1042                 }
 1043         }
 1044         for (i = 0; i < allrates.rs_nrates; i++) {
 1045                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
 1046                                 IEEE80211_MODE_AUTO);
 1047                 if (mword == 0)
 1048                         continue;
 1049                 /* NB: remove media options from mword */
 1050                 addmedia(media, caps, addsta,
 1051                     IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
 1052         }
 1053         /*
 1054          * Add HT/11n media.  Note that we do not have enough
 1055          * bits in the media subtype to express the MCS so we
 1056          * use a "placeholder" media subtype and any fixed MCS
 1057          * must be specified with a different mechanism.
 1058          */
 1059         for (; mode <= IEEE80211_MODE_11NG; mode++) {
 1060                 if (isclr(ic->ic_modecaps, mode))
 1061                         continue;
 1062                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1063                 addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
 1064         }
 1065         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
 1066             isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
 1067                 addmedia(media, caps, addsta,
 1068                     IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
 1069                 /* XXX could walk htrates */
 1070                 /* XXX known array size */
 1071                 if (ieee80211_htrates[15].ht40_rate_400ns > maxrate)
 1072                         maxrate = ieee80211_htrates[15].ht40_rate_400ns;
 1073         }
 1074         return maxrate;
 1075 }
 1076 
 1077 void
 1078 ieee80211_media_init(struct ieee80211com *ic)
 1079 {
 1080         struct ifnet *ifp = ic->ic_ifp;
 1081         int maxrate;
 1082 
 1083         /* NB: this works because the structure is initialized to zero */
 1084         if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
 1085                 /*
 1086                  * We are re-initializing the channel list; clear
 1087                  * the existing media state as the media routines
 1088                  * don't suppress duplicates.
 1089                  */
 1090                 ifmedia_removeall(&ic->ic_media);
 1091         }
 1092         ieee80211_chan_init(ic);
 1093 
 1094         /*
 1095          * Recalculate media settings in case new channel list changes
 1096          * the set of available modes.
 1097          */
 1098         maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
 1099                 ieee80211com_media_change, ieee80211com_media_status);
 1100         /* NB: strip explicit mode; we're actually in autoselect */
 1101         ifmedia_set(&ic->ic_media,
 1102             media_status(ic->ic_opmode, ic->ic_curchan) &~
 1103                 (IFM_MMASK | IFM_IEEE80211_TURBO));
 1104         if (maxrate)
 1105                 ifp->if_baudrate = IF_Mbps(maxrate);
 1106 
 1107         /* XXX need to propagate new media settings to vap's */
 1108 }
 1109 
 1110 /* XXX inline or eliminate? */
 1111 const struct ieee80211_rateset *
 1112 ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
 1113 {
 1114         /* XXX does this work for 11ng basic rates? */
 1115         return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
 1116 }
 1117 
 1118 void
 1119 ieee80211_announce(struct ieee80211com *ic)
 1120 {
 1121         struct ifnet *ifp = ic->ic_ifp;
 1122         int i, mode, rate, mword;
 1123         const struct ieee80211_rateset *rs;
 1124 
 1125         /* NB: skip AUTO since it has no rates */
 1126         for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
 1127                 if (isclr(ic->ic_modecaps, mode))
 1128                         continue;
 1129                 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
 1130                 rs = &ic->ic_sup_rates[mode];
 1131                 for (i = 0; i < rs->rs_nrates; i++) {
 1132                         mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
 1133                         if (mword == 0)
 1134                                 continue;
 1135                         rate = ieee80211_media2rate(mword);
 1136                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
 1137                             rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
 1138                 }
 1139                 printf("\n");
 1140         }
 1141         ieee80211_ht_announce(ic);
 1142 }
 1143 
 1144 void
 1145 ieee80211_announce_channels(struct ieee80211com *ic)
 1146 {
 1147         const struct ieee80211_channel *c;
 1148         char type;
 1149         int i, cw;
 1150 
 1151         printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
 1152         for (i = 0; i < ic->ic_nchans; i++) {
 1153                 c = &ic->ic_channels[i];
 1154                 if (IEEE80211_IS_CHAN_ST(c))
 1155                         type = 'S';
 1156                 else if (IEEE80211_IS_CHAN_108A(c))
 1157                         type = 'T';
 1158                 else if (IEEE80211_IS_CHAN_108G(c))
 1159                         type = 'G';
 1160                 else if (IEEE80211_IS_CHAN_HT(c))
 1161                         type = 'n';
 1162                 else if (IEEE80211_IS_CHAN_A(c))
 1163                         type = 'a';
 1164                 else if (IEEE80211_IS_CHAN_ANYG(c))
 1165                         type = 'g';
 1166                 else if (IEEE80211_IS_CHAN_B(c))
 1167                         type = 'b';
 1168                 else
 1169                         type = 'f';
 1170                 if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
 1171                         cw = 40;
 1172                 else if (IEEE80211_IS_CHAN_HALF(c))
 1173                         cw = 10;
 1174                 else if (IEEE80211_IS_CHAN_QUARTER(c))
 1175                         cw = 5;
 1176                 else
 1177                         cw = 20;
 1178                 printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
 1179                         , c->ic_ieee, c->ic_freq, type
 1180                         , cw
 1181                         , IEEE80211_IS_CHAN_HT40U(c) ? '+' :
 1182                           IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
 1183                         , c->ic_maxregpower
 1184                         , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
 1185                         , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
 1186                 );
 1187         }
 1188 }
 1189 
 1190 static int
 1191 media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
 1192 {
 1193         switch (IFM_MODE(ime->ifm_media)) {
 1194         case IFM_IEEE80211_11A:
 1195                 *mode = IEEE80211_MODE_11A;
 1196                 break;
 1197         case IFM_IEEE80211_11B:
 1198                 *mode = IEEE80211_MODE_11B;
 1199                 break;
 1200         case IFM_IEEE80211_11G:
 1201                 *mode = IEEE80211_MODE_11G;
 1202                 break;
 1203         case IFM_IEEE80211_FH:
 1204                 *mode = IEEE80211_MODE_FH;
 1205                 break;
 1206         case IFM_IEEE80211_11NA:
 1207                 *mode = IEEE80211_MODE_11NA;
 1208                 break;
 1209         case IFM_IEEE80211_11NG:
 1210                 *mode = IEEE80211_MODE_11NG;
 1211                 break;
 1212         case IFM_AUTO:
 1213                 *mode = IEEE80211_MODE_AUTO;
 1214                 break;
 1215         default:
 1216                 return 0;
 1217         }
 1218         /*
 1219          * Turbo mode is an ``option''.
 1220          * XXX does not apply to AUTO
 1221          */
 1222         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
 1223                 if (*mode == IEEE80211_MODE_11A) {
 1224                         if (flags & IEEE80211_F_TURBOP)
 1225                                 *mode = IEEE80211_MODE_TURBO_A;
 1226                         else
 1227                                 *mode = IEEE80211_MODE_STURBO_A;
 1228                 } else if (*mode == IEEE80211_MODE_11G)
 1229                         *mode = IEEE80211_MODE_TURBO_G;
 1230                 else
 1231                         return 0;
 1232         }
 1233         /* XXX HT40 +/- */
 1234         return 1;
 1235 }
 1236 
 1237 /*
 1238  * Handle a media change request on the underlying interface.
 1239  */
 1240 int
 1241 ieee80211com_media_change(struct ifnet *ifp)
 1242 {
 1243         return EINVAL;
 1244 }
 1245 
 1246 /*
 1247  * Handle a media change request on the vap interface.
 1248  */
 1249 int
 1250 ieee80211_media_change(struct ifnet *ifp)
 1251 {
 1252         struct ieee80211vap *vap = ifp->if_softc;
 1253         struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
 1254         uint16_t newmode;
 1255 
 1256         if (!media2mode(ime, vap->iv_flags, &newmode))
 1257                 return EINVAL;
 1258         if (vap->iv_des_mode != newmode) {
 1259                 vap->iv_des_mode = newmode;
 1260                 /* XXX kick state machine if up+running */
 1261         }
 1262         return 0;
 1263 }
 1264 
 1265 /*
 1266  * Common code to calculate the media status word
 1267  * from the operating mode and channel state.
 1268  */
 1269 static int
 1270 media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
 1271 {
 1272         int status;
 1273 
 1274         status = IFM_IEEE80211;
 1275         switch (opmode) {
 1276         case IEEE80211_M_STA:
 1277                 break;
 1278         case IEEE80211_M_IBSS:
 1279                 status |= IFM_IEEE80211_ADHOC;
 1280                 break;
 1281         case IEEE80211_M_HOSTAP:
 1282                 status |= IFM_IEEE80211_HOSTAP;
 1283                 break;
 1284         case IEEE80211_M_MONITOR:
 1285                 status |= IFM_IEEE80211_MONITOR;
 1286                 break;
 1287         case IEEE80211_M_AHDEMO:
 1288                 status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
 1289                 break;
 1290         case IEEE80211_M_WDS:
 1291                 status |= IFM_IEEE80211_WDS;
 1292                 break;
 1293         case IEEE80211_M_MBSS:
 1294                 status |= IFM_IEEE80211_MBSS;
 1295                 break;
 1296         }
 1297         if (IEEE80211_IS_CHAN_HTA(chan)) {
 1298                 status |= IFM_IEEE80211_11NA;
 1299         } else if (IEEE80211_IS_CHAN_HTG(chan)) {
 1300                 status |= IFM_IEEE80211_11NG;
 1301         } else if (IEEE80211_IS_CHAN_A(chan)) {
 1302                 status |= IFM_IEEE80211_11A;
 1303         } else if (IEEE80211_IS_CHAN_B(chan)) {
 1304                 status |= IFM_IEEE80211_11B;
 1305         } else if (IEEE80211_IS_CHAN_ANYG(chan)) {
 1306                 status |= IFM_IEEE80211_11G;
 1307         } else if (IEEE80211_IS_CHAN_FHSS(chan)) {
 1308                 status |= IFM_IEEE80211_FH;
 1309         }
 1310         /* XXX else complain? */
 1311 
 1312         if (IEEE80211_IS_CHAN_TURBO(chan))
 1313                 status |= IFM_IEEE80211_TURBO;
 1314 #if 0
 1315         if (IEEE80211_IS_CHAN_HT20(chan))
 1316                 status |= IFM_IEEE80211_HT20;
 1317         if (IEEE80211_IS_CHAN_HT40(chan))
 1318                 status |= IFM_IEEE80211_HT40;
 1319 #endif
 1320         return status;
 1321 }
 1322 
 1323 static void
 1324 ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1325 {
 1326         struct ieee80211com *ic = ifp->if_l2com;
 1327         struct ieee80211vap *vap;
 1328 
 1329         imr->ifm_status = IFM_AVALID;
 1330         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 1331                 if (vap->iv_ifp->if_flags & IFF_UP) {
 1332                         imr->ifm_status |= IFM_ACTIVE;
 1333                         break;
 1334                 }
 1335         imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
 1336         if (imr->ifm_status & IFM_ACTIVE)
 1337                 imr->ifm_current = imr->ifm_active;
 1338 }
 1339 
 1340 void
 1341 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1342 {
 1343         struct ieee80211vap *vap = ifp->if_softc;
 1344         struct ieee80211com *ic = vap->iv_ic;
 1345         enum ieee80211_phymode mode;
 1346 
 1347         imr->ifm_status = IFM_AVALID;
 1348         /*
 1349          * NB: use the current channel's mode to lock down a xmit
 1350          * rate only when running; otherwise we may have a mismatch
 1351          * in which case the rate will not be convertible.
 1352          */
 1353         if (vap->iv_state == IEEE80211_S_RUN) {
 1354                 imr->ifm_status |= IFM_ACTIVE;
 1355                 mode = ieee80211_chan2mode(ic->ic_curchan);
 1356         } else
 1357                 mode = IEEE80211_MODE_AUTO;
 1358         imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
 1359         /*
 1360          * Calculate a current rate if possible.
 1361          */
 1362         if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
 1363                 /*
 1364                  * A fixed rate is set, report that.
 1365                  */
 1366                 imr->ifm_active |= ieee80211_rate2media(ic,
 1367                         vap->iv_txparms[mode].ucastrate, mode);
 1368         } else if (vap->iv_opmode == IEEE80211_M_STA) {
 1369                 /*
 1370                  * In station mode report the current transmit rate.
 1371                  */
 1372                 imr->ifm_active |= ieee80211_rate2media(ic,
 1373                         vap->iv_bss->ni_txrate, mode);
 1374         } else
 1375                 imr->ifm_active |= IFM_AUTO;
 1376         if (imr->ifm_status & IFM_ACTIVE)
 1377                 imr->ifm_current = imr->ifm_active;
 1378 }
 1379 
 1380 /*
 1381  * Set the current phy mode and recalculate the active channel
 1382  * set based on the available channels for this mode.  Also
 1383  * select a new default/current channel if the current one is
 1384  * inappropriate for this mode.
 1385  */
 1386 int
 1387 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
 1388 {
 1389         /*
 1390          * Adjust basic rates in 11b/11g supported rate set.
 1391          * Note that if operating on a hal/quarter rate channel
 1392          * this is a noop as those rates sets are different
 1393          * and used instead.
 1394          */
 1395         if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
 1396                 ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
 1397 
 1398         ic->ic_curmode = mode;
 1399         ieee80211_reset_erp(ic);        /* reset ERP state */
 1400 
 1401         return 0;
 1402 }
 1403 
 1404 /*
 1405  * Return the phy mode for with the specified channel.
 1406  */
 1407 enum ieee80211_phymode
 1408 ieee80211_chan2mode(const struct ieee80211_channel *chan)
 1409 {
 1410 
 1411         if (IEEE80211_IS_CHAN_HTA(chan))
 1412                 return IEEE80211_MODE_11NA;
 1413         else if (IEEE80211_IS_CHAN_HTG(chan))
 1414                 return IEEE80211_MODE_11NG;
 1415         else if (IEEE80211_IS_CHAN_108G(chan))
 1416                 return IEEE80211_MODE_TURBO_G;
 1417         else if (IEEE80211_IS_CHAN_ST(chan))
 1418                 return IEEE80211_MODE_STURBO_A;
 1419         else if (IEEE80211_IS_CHAN_TURBO(chan))
 1420                 return IEEE80211_MODE_TURBO_A;
 1421         else if (IEEE80211_IS_CHAN_HALF(chan))
 1422                 return IEEE80211_MODE_HALF;
 1423         else if (IEEE80211_IS_CHAN_QUARTER(chan))
 1424                 return IEEE80211_MODE_QUARTER;
 1425         else if (IEEE80211_IS_CHAN_A(chan))
 1426                 return IEEE80211_MODE_11A;
 1427         else if (IEEE80211_IS_CHAN_ANYG(chan))
 1428                 return IEEE80211_MODE_11G;
 1429         else if (IEEE80211_IS_CHAN_B(chan))
 1430                 return IEEE80211_MODE_11B;
 1431         else if (IEEE80211_IS_CHAN_FHSS(chan))
 1432                 return IEEE80211_MODE_FH;
 1433 
 1434         /* NB: should not get here */
 1435         printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
 1436                 __func__, chan->ic_freq, chan->ic_flags);
 1437         return IEEE80211_MODE_11B;
 1438 }
 1439 
 1440 struct ratemedia {
 1441         u_int   match;  /* rate + mode */
 1442         u_int   media;  /* if_media rate */
 1443 };
 1444 
 1445 static int
 1446 findmedia(const struct ratemedia rates[], int n, u_int match)
 1447 {
 1448         int i;
 1449 
 1450         for (i = 0; i < n; i++)
 1451                 if (rates[i].match == match)
 1452                         return rates[i].media;
 1453         return IFM_AUTO;
 1454 }
 1455 
 1456 /*
 1457  * Convert IEEE80211 rate value to ifmedia subtype.
 1458  * Rate is either a legacy rate in units of 0.5Mbps
 1459  * or an MCS index.
 1460  */
 1461 int
 1462 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
 1463 {
 1464 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1465         static const struct ratemedia rates[] = {
 1466                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
 1467                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
 1468                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
 1469                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
 1470                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
 1471                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
 1472                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
 1473                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
 1474                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
 1475                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
 1476                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
 1477                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
 1478                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
 1479                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
 1480                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
 1481                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
 1482                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
 1483                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
 1484                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
 1485                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
 1486                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
 1487                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
 1488                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
 1489                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
 1490                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
 1491                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
 1492                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
 1493                 {   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
 1494                 {   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
 1495                 {  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
 1496                 /* NB: OFDM72 doesn't realy exist so we don't handle it */
 1497         };
 1498         static const struct ratemedia htrates[] = {
 1499                 {   0, IFM_IEEE80211_MCS },
 1500                 {   1, IFM_IEEE80211_MCS },
 1501                 {   2, IFM_IEEE80211_MCS },
 1502                 {   3, IFM_IEEE80211_MCS },
 1503                 {   4, IFM_IEEE80211_MCS },
 1504                 {   5, IFM_IEEE80211_MCS },
 1505                 {   6, IFM_IEEE80211_MCS },
 1506                 {   7, IFM_IEEE80211_MCS },
 1507                 {   8, IFM_IEEE80211_MCS },
 1508                 {   9, IFM_IEEE80211_MCS },
 1509                 {  10, IFM_IEEE80211_MCS },
 1510                 {  11, IFM_IEEE80211_MCS },
 1511                 {  12, IFM_IEEE80211_MCS },
 1512                 {  13, IFM_IEEE80211_MCS },
 1513                 {  14, IFM_IEEE80211_MCS },
 1514                 {  15, IFM_IEEE80211_MCS },
 1515         };
 1516         int m;
 1517 
 1518         /*
 1519          * Check 11n rates first for match as an MCS.
 1520          */
 1521         if (mode == IEEE80211_MODE_11NA) {
 1522                 if (rate & IEEE80211_RATE_MCS) {
 1523                         rate &= ~IEEE80211_RATE_MCS;
 1524                         m = findmedia(htrates, N(htrates), rate);
 1525                         if (m != IFM_AUTO)
 1526                                 return m | IFM_IEEE80211_11NA;
 1527                 }
 1528         } else if (mode == IEEE80211_MODE_11NG) {
 1529                 /* NB: 12 is ambiguous, it will be treated as an MCS */
 1530                 if (rate & IEEE80211_RATE_MCS) {
 1531                         rate &= ~IEEE80211_RATE_MCS;
 1532                         m = findmedia(htrates, N(htrates), rate);
 1533                         if (m != IFM_AUTO)
 1534                                 return m | IFM_IEEE80211_11NG;
 1535                 }
 1536         }
 1537         rate &= IEEE80211_RATE_VAL;
 1538         switch (mode) {
 1539         case IEEE80211_MODE_11A:
 1540         case IEEE80211_MODE_HALF:               /* XXX good 'nuf */
 1541         case IEEE80211_MODE_QUARTER:
 1542         case IEEE80211_MODE_11NA:
 1543         case IEEE80211_MODE_TURBO_A:
 1544         case IEEE80211_MODE_STURBO_A:
 1545                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11A);
 1546         case IEEE80211_MODE_11B:
 1547                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B);
 1548         case IEEE80211_MODE_FH:
 1549                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH);
 1550         case IEEE80211_MODE_AUTO:
 1551                 /* NB: ic may be NULL for some drivers */
 1552                 if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
 1553                         return findmedia(rates, N(rates),
 1554                             rate | IFM_IEEE80211_FH);
 1555                 /* NB: hack, 11g matches both 11b+11a rates */
 1556                 /* fall thru... */
 1557         case IEEE80211_MODE_11G:
 1558         case IEEE80211_MODE_11NG:
 1559         case IEEE80211_MODE_TURBO_G:
 1560                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11G);
 1561         }
 1562         return IFM_AUTO;
 1563 #undef N
 1564 }
 1565 
 1566 int
 1567 ieee80211_media2rate(int mword)
 1568 {
 1569 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1570         static const int ieeerates[] = {
 1571                 -1,             /* IFM_AUTO */
 1572                 0,              /* IFM_MANUAL */
 1573                 0,              /* IFM_NONE */
 1574                 2,              /* IFM_IEEE80211_FH1 */
 1575                 4,              /* IFM_IEEE80211_FH2 */
 1576                 2,              /* IFM_IEEE80211_DS1 */
 1577                 4,              /* IFM_IEEE80211_DS2 */
 1578                 11,             /* IFM_IEEE80211_DS5 */
 1579                 22,             /* IFM_IEEE80211_DS11 */
 1580                 44,             /* IFM_IEEE80211_DS22 */
 1581                 12,             /* IFM_IEEE80211_OFDM6 */
 1582                 18,             /* IFM_IEEE80211_OFDM9 */
 1583                 24,             /* IFM_IEEE80211_OFDM12 */
 1584                 36,             /* IFM_IEEE80211_OFDM18 */
 1585                 48,             /* IFM_IEEE80211_OFDM24 */
 1586                 72,             /* IFM_IEEE80211_OFDM36 */
 1587                 96,             /* IFM_IEEE80211_OFDM48 */
 1588                 108,            /* IFM_IEEE80211_OFDM54 */
 1589                 144,            /* IFM_IEEE80211_OFDM72 */
 1590                 0,              /* IFM_IEEE80211_DS354k */
 1591                 0,              /* IFM_IEEE80211_DS512k */
 1592                 6,              /* IFM_IEEE80211_OFDM3 */
 1593                 9,              /* IFM_IEEE80211_OFDM4 */
 1594                 54,             /* IFM_IEEE80211_OFDM27 */
 1595                 -1,             /* IFM_IEEE80211_MCS */
 1596         };
 1597         return IFM_SUBTYPE(mword) < N(ieeerates) ?
 1598                 ieeerates[IFM_SUBTYPE(mword)] : 0;
 1599 #undef N
 1600 }
 1601 
 1602 /*
 1603  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 1604  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 1605  */
 1606 #define mix(a, b, c)                                                    \
 1607 do {                                                                    \
 1608         a -= b; a -= c; a ^= (c >> 13);                                 \
 1609         b -= c; b -= a; b ^= (a << 8);                                  \
 1610         c -= a; c -= b; c ^= (b >> 13);                                 \
 1611         a -= b; a -= c; a ^= (c >> 12);                                 \
 1612         b -= c; b -= a; b ^= (a << 16);                                 \
 1613         c -= a; c -= b; c ^= (b >> 5);                                  \
 1614         a -= b; a -= c; a ^= (c >> 3);                                  \
 1615         b -= c; b -= a; b ^= (a << 10);                                 \
 1616         c -= a; c -= b; c ^= (b >> 15);                                 \
 1617 } while (/*CONSTCOND*/0)
 1618 
 1619 uint32_t
 1620 ieee80211_mac_hash(const struct ieee80211com *ic,
 1621         const uint8_t addr[IEEE80211_ADDR_LEN])
 1622 {
 1623         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
 1624 
 1625         b += addr[5] << 8;
 1626         b += addr[4];
 1627         a += addr[3] << 24;
 1628         a += addr[2] << 16;
 1629         a += addr[1] << 8;
 1630         a += addr[0];
 1631 
 1632         mix(a, b, c);
 1633 
 1634         return c;
 1635 }
 1636 #undef mix

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