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/8.0/sys/net80211/ieee80211.c 196161 2009-08-12 21:34:57Z sam $");
   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 
   53 #include <net/bpf.h>
   54 
   55 const char *ieee80211_phymode_name[IEEE80211_MODE_MAX] = {
   56         [IEEE80211_MODE_AUTO]     = "auto",
   57         [IEEE80211_MODE_11A]      = "11a",
   58         [IEEE80211_MODE_11B]      = "11b",
   59         [IEEE80211_MODE_11G]      = "11g",
   60         [IEEE80211_MODE_FH]       = "FH",
   61         [IEEE80211_MODE_TURBO_A]  = "turboA",
   62         [IEEE80211_MODE_TURBO_G]  = "turboG",
   63         [IEEE80211_MODE_STURBO_A] = "sturboA",
   64         [IEEE80211_MODE_HALF]     = "half",
   65         [IEEE80211_MODE_QUARTER]  = "quarter",
   66         [IEEE80211_MODE_11NA]     = "11na",
   67         [IEEE80211_MODE_11NG]     = "11ng",
   68 };
   69 /* map ieee80211_opmode to the corresponding capability bit */
   70 const int ieee80211_opcap[IEEE80211_OPMODE_MAX] = {
   71         [IEEE80211_M_IBSS]      = IEEE80211_C_IBSS,
   72         [IEEE80211_M_WDS]       = IEEE80211_C_WDS,
   73         [IEEE80211_M_STA]       = IEEE80211_C_STA,
   74         [IEEE80211_M_AHDEMO]    = IEEE80211_C_AHDEMO,
   75         [IEEE80211_M_HOSTAP]    = IEEE80211_C_HOSTAP,
   76         [IEEE80211_M_MONITOR]   = IEEE80211_C_MONITOR,
   77 #ifdef IEEE80211_SUPPORT_MESH
   78         [IEEE80211_M_MBSS]      = IEEE80211_C_MBSS,
   79 #endif
   80 };
   81 
   82 static const uint8_t ieee80211broadcastaddr[IEEE80211_ADDR_LEN] =
   83         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
   84 
   85 static  void ieee80211_syncflag_locked(struct ieee80211com *ic, int flag);
   86 static  void ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag);
   87 static  void ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag);
   88 static  int ieee80211_media_setup(struct ieee80211com *ic,
   89                 struct ifmedia *media, int caps, int addsta,
   90                 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
   91 static  void ieee80211com_media_status(struct ifnet *, struct ifmediareq *);
   92 static  int ieee80211com_media_change(struct ifnet *);
   93 static  int media_status(enum ieee80211_opmode,
   94                 const struct ieee80211_channel *);
   95 
   96 MALLOC_DEFINE(M_80211_VAP, "80211vap", "802.11 vap state");
   97 
   98 /*
   99  * Default supported rates for 802.11 operation (in IEEE .5Mb units).
  100  */
  101 #define B(r)    ((r) | IEEE80211_RATE_BASIC)
  102 static const struct ieee80211_rateset ieee80211_rateset_11a =
  103         { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } };
  104 static const struct ieee80211_rateset ieee80211_rateset_half =
  105         { 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } };
  106 static const struct ieee80211_rateset ieee80211_rateset_quarter =
  107         { 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } };
  108 static const struct ieee80211_rateset ieee80211_rateset_11b =
  109         { 4, { B(2), B(4), B(11), B(22) } };
  110 /* NB: OFDM rates are handled specially based on mode */
  111 static const struct ieee80211_rateset ieee80211_rateset_11g =
  112         { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } };
  113 #undef B
  114 
  115 /*
  116  * Fill in 802.11 available channel set, mark
  117  * all available channels as active, and pick
  118  * a default channel if not already specified.
  119  */
  120 static void
  121 ieee80211_chan_init(struct ieee80211com *ic)
  122 {
  123 #define DEFAULTRATES(m, def) do { \
  124         if (ic->ic_sup_rates[m].rs_nrates == 0) \
  125                 ic->ic_sup_rates[m] = def; \
  126 } while (0)
  127         struct ieee80211_channel *c;
  128         int i;
  129 
  130         KASSERT(0 < ic->ic_nchans && ic->ic_nchans <= IEEE80211_CHAN_MAX,
  131                 ("invalid number of channels specified: %u", ic->ic_nchans));
  132         memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
  133         memset(ic->ic_modecaps, 0, sizeof(ic->ic_modecaps));
  134         setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO);
  135         for (i = 0; i < ic->ic_nchans; i++) {
  136                 c = &ic->ic_channels[i];
  137                 KASSERT(c->ic_flags != 0, ("channel with no flags"));
  138                 /*
  139                  * Help drivers that work only with frequencies by filling
  140                  * in IEEE channel #'s if not already calculated.  Note this
  141                  * mimics similar work done in ieee80211_setregdomain when
  142                  * changing regulatory state.
  143                  */
  144                 if (c->ic_ieee == 0)
  145                         c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
  146                 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
  147                         c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
  148                             (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
  149                             c->ic_flags);
  150                 /* default max tx power to max regulatory */
  151                 if (c->ic_maxpower == 0)
  152                         c->ic_maxpower = 2*c->ic_maxregpower;
  153                 setbit(ic->ic_chan_avail, c->ic_ieee);
  154                 /*
  155                  * Identify mode capabilities.
  156                  */
  157                 if (IEEE80211_IS_CHAN_A(c))
  158                         setbit(ic->ic_modecaps, IEEE80211_MODE_11A);
  159                 if (IEEE80211_IS_CHAN_B(c))
  160                         setbit(ic->ic_modecaps, IEEE80211_MODE_11B);
  161                 if (IEEE80211_IS_CHAN_ANYG(c))
  162                         setbit(ic->ic_modecaps, IEEE80211_MODE_11G);
  163                 if (IEEE80211_IS_CHAN_FHSS(c))
  164                         setbit(ic->ic_modecaps, IEEE80211_MODE_FH);
  165                 if (IEEE80211_IS_CHAN_108A(c))
  166                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A);
  167                 if (IEEE80211_IS_CHAN_108G(c))
  168                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G);
  169                 if (IEEE80211_IS_CHAN_ST(c))
  170                         setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A);
  171                 if (IEEE80211_IS_CHAN_HALF(c))
  172                         setbit(ic->ic_modecaps, IEEE80211_MODE_HALF);
  173                 if (IEEE80211_IS_CHAN_QUARTER(c))
  174                         setbit(ic->ic_modecaps, IEEE80211_MODE_QUARTER);
  175                 if (IEEE80211_IS_CHAN_HTA(c))
  176                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NA);
  177                 if (IEEE80211_IS_CHAN_HTG(c))
  178                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NG);
  179         }
  180         /* initialize candidate channels to all available */
  181         memcpy(ic->ic_chan_active, ic->ic_chan_avail,
  182                 sizeof(ic->ic_chan_avail));
  183 
  184         /* sort channel table to allow lookup optimizations */
  185         ieee80211_sort_channels(ic->ic_channels, ic->ic_nchans);
  186 
  187         /* invalidate any previous state */
  188         ic->ic_bsschan = IEEE80211_CHAN_ANYC;
  189         ic->ic_prevchan = NULL;
  190         ic->ic_csa_newchan = NULL;
  191         /* arbitrarily pick the first channel */
  192         ic->ic_curchan = &ic->ic_channels[0];
  193         ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  194 
  195         /* fillin well-known rate sets if driver has not specified */
  196         DEFAULTRATES(IEEE80211_MODE_11B,         ieee80211_rateset_11b);
  197         DEFAULTRATES(IEEE80211_MODE_11G,         ieee80211_rateset_11g);
  198         DEFAULTRATES(IEEE80211_MODE_11A,         ieee80211_rateset_11a);
  199         DEFAULTRATES(IEEE80211_MODE_TURBO_A,     ieee80211_rateset_11a);
  200         DEFAULTRATES(IEEE80211_MODE_TURBO_G,     ieee80211_rateset_11g);
  201         DEFAULTRATES(IEEE80211_MODE_STURBO_A,    ieee80211_rateset_11a);
  202         DEFAULTRATES(IEEE80211_MODE_HALF,        ieee80211_rateset_half);
  203         DEFAULTRATES(IEEE80211_MODE_QUARTER,     ieee80211_rateset_quarter);
  204         DEFAULTRATES(IEEE80211_MODE_11NA,        ieee80211_rateset_11a);
  205         DEFAULTRATES(IEEE80211_MODE_11NG,        ieee80211_rateset_11g);
  206 
  207         /*
  208          * Set auto mode to reset active channel state and any desired channel.
  209          */
  210         (void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
  211 #undef DEFAULTRATES
  212 }
  213 
  214 static void
  215 null_update_mcast(struct ifnet *ifp)
  216 {
  217         if_printf(ifp, "need multicast update callback\n");
  218 }
  219 
  220 static void
  221 null_update_promisc(struct ifnet *ifp)
  222 {
  223         if_printf(ifp, "need promiscuous mode update callback\n");
  224 }
  225 
  226 static int
  227 null_transmit(struct ifnet *ifp, struct mbuf *m)
  228 {
  229         m_freem(m);
  230         ifp->if_oerrors++;
  231         return EACCES;          /* XXX EIO/EPERM? */
  232 }
  233 
  234 static int
  235 null_output(struct ifnet *ifp, struct mbuf *m,
  236         struct sockaddr *dst, struct route *ro)
  237 {
  238         if_printf(ifp, "discard raw packet\n");
  239         return null_transmit(ifp, m);
  240 }
  241 
  242 static void
  243 null_input(struct ifnet *ifp, struct mbuf *m)
  244 {
  245         if_printf(ifp, "if_input should not be called\n");
  246         m_freem(m);
  247 }
  248 
  249 /*
  250  * Attach/setup the common net80211 state.  Called by
  251  * the driver on attach to prior to creating any vap's.
  252  */
  253 void
  254 ieee80211_ifattach(struct ieee80211com *ic,
  255         const uint8_t macaddr[IEEE80211_ADDR_LEN])
  256 {
  257         struct ifnet *ifp = ic->ic_ifp;
  258         struct sockaddr_dl *sdl;
  259         struct ifaddr *ifa;
  260 
  261         KASSERT(ifp->if_type == IFT_IEEE80211, ("if_type %d", ifp->if_type));
  262 
  263         IEEE80211_LOCK_INIT(ic, ifp->if_xname);
  264         TAILQ_INIT(&ic->ic_vaps);
  265 
  266         /* Create a taskqueue for all state changes */
  267         ic->ic_tq = taskqueue_create("ic_taskq", M_WAITOK | M_ZERO,
  268             taskqueue_thread_enqueue, &ic->ic_tq);
  269         taskqueue_start_threads(&ic->ic_tq, 1, PI_NET, "%s taskq",
  270             ifp->if_xname);
  271         /*
  272          * Fill in 802.11 available channel set, mark all
  273          * available channels as active, and pick a default
  274          * channel if not already specified.
  275          */
  276         ieee80211_media_init(ic);
  277 
  278         ic->ic_update_mcast = null_update_mcast;
  279         ic->ic_update_promisc = null_update_promisc;
  280 
  281         ic->ic_hash_key = arc4random();
  282         ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
  283         ic->ic_lintval = ic->ic_bintval;
  284         ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
  285 
  286         ieee80211_crypto_attach(ic);
  287         ieee80211_node_attach(ic);
  288         ieee80211_power_attach(ic);
  289         ieee80211_proto_attach(ic);
  290 #ifdef IEEE80211_SUPPORT_SUPERG
  291         ieee80211_superg_attach(ic);
  292 #endif
  293         ieee80211_ht_attach(ic);
  294         ieee80211_scan_attach(ic);
  295         ieee80211_regdomain_attach(ic);
  296         ieee80211_dfs_attach(ic);
  297 
  298         ieee80211_sysctl_attach(ic);
  299 
  300         ifp->if_addrlen = IEEE80211_ADDR_LEN;
  301         ifp->if_hdrlen = 0;
  302         if_attach(ifp);
  303         ifp->if_mtu = IEEE80211_MTU_MAX;
  304         ifp->if_broadcastaddr = ieee80211broadcastaddr;
  305         ifp->if_output = null_output;
  306         ifp->if_input = null_input;     /* just in case */
  307         ifp->if_resolvemulti = NULL;    /* NB: callers check */
  308 
  309         ifa = ifaddr_byindex(ifp->if_index);
  310         KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
  311         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  312         sdl->sdl_type = IFT_ETHER;              /* XXX IFT_IEEE80211? */
  313         sdl->sdl_alen = IEEE80211_ADDR_LEN;
  314         IEEE80211_ADDR_COPY(LLADDR(sdl), macaddr);
  315         ifa_free(ifa);
  316 }
  317 
  318 /*
  319  * Detach net80211 state on device detach.  Tear down
  320  * all vap's and reclaim all common state prior to the
  321  * device state going away.  Note we may call back into
  322  * driver; it must be prepared for this.
  323  */
  324 void
  325 ieee80211_ifdetach(struct ieee80211com *ic)
  326 {
  327         struct ifnet *ifp = ic->ic_ifp;
  328         struct ieee80211vap *vap;
  329 
  330         if_detach(ifp);
  331 
  332         while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
  333                 ieee80211_vap_destroy(vap);
  334         ieee80211_waitfor_parent(ic);
  335 
  336         ieee80211_sysctl_detach(ic);
  337         ieee80211_dfs_detach(ic);
  338         ieee80211_regdomain_detach(ic);
  339         ieee80211_scan_detach(ic);
  340 #ifdef IEEE80211_SUPPORT_SUPERG
  341         ieee80211_superg_detach(ic);
  342 #endif
  343         ieee80211_ht_detach(ic);
  344         /* NB: must be called before ieee80211_node_detach */
  345         ieee80211_proto_detach(ic);
  346         ieee80211_crypto_detach(ic);
  347         ieee80211_power_detach(ic);
  348         ieee80211_node_detach(ic);
  349 
  350         ifmedia_removeall(&ic->ic_media);
  351         taskqueue_free(ic->ic_tq);
  352         IEEE80211_LOCK_DESTROY(ic);
  353 }
  354 
  355 /*
  356  * Default reset method for use with the ioctl support.  This
  357  * method is invoked after any state change in the 802.11
  358  * layer that should be propagated to the hardware but not
  359  * require re-initialization of the 802.11 state machine (e.g
  360  * rescanning for an ap).  We always return ENETRESET which
  361  * should cause the driver to re-initialize the device. Drivers
  362  * can override this method to implement more optimized support.
  363  */
  364 static int
  365 default_reset(struct ieee80211vap *vap, u_long cmd)
  366 {
  367         return ENETRESET;
  368 }
  369 
  370 /*
  371  * Prepare a vap for use.  Drivers use this call to
  372  * setup net80211 state in new vap's prior attaching
  373  * them with ieee80211_vap_attach (below).
  374  */
  375 int
  376 ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
  377         const char name[IFNAMSIZ], int unit, int opmode, int flags,
  378         const uint8_t bssid[IEEE80211_ADDR_LEN],
  379         const uint8_t macaddr[IEEE80211_ADDR_LEN])
  380 {
  381         struct ifnet *ifp;
  382 
  383         ifp = if_alloc(IFT_ETHER);
  384         if (ifp == NULL) {
  385                 if_printf(ic->ic_ifp, "%s: unable to allocate ifnet\n",
  386                     __func__);
  387                 return ENOMEM;
  388         }
  389         if_initname(ifp, name, unit);
  390         ifp->if_softc = vap;                    /* back pointer */
  391         ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
  392         ifp->if_start = ieee80211_start;
  393         ifp->if_ioctl = ieee80211_ioctl;
  394         ifp->if_watchdog = NULL;                /* NB: no watchdog routine */
  395         ifp->if_init = ieee80211_init;
  396         /* NB: input+output filled in by ether_ifattach */
  397         IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
  398         ifp->if_snd.ifq_drv_maxlen = IFQ_MAXLEN;
  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         /*
  445          * Enable various functionality by default if we're
  446          * capable; the driver can override us if it knows better.
  447          */
  448         if (vap->iv_caps & IEEE80211_C_WME)
  449                 vap->iv_flags |= IEEE80211_F_WME;
  450         if (vap->iv_caps & IEEE80211_C_BURST)
  451                 vap->iv_flags |= IEEE80211_F_BURST;
  452         /* NB: bg scanning only makes sense for station mode right now */
  453         if (vap->iv_opmode == IEEE80211_M_STA &&
  454             (vap->iv_caps & IEEE80211_C_BGSCAN))
  455                 vap->iv_flags |= IEEE80211_F_BGSCAN;
  456         vap->iv_flags |= IEEE80211_F_DOTH;      /* XXX no cap, just ena */
  457         /* NB: DFS support only makes sense for ap mode right now */
  458         if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
  459             (vap->iv_caps & IEEE80211_C_DFS))
  460                 vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
  461 
  462         vap->iv_des_chan = IEEE80211_CHAN_ANYC;         /* any channel is ok */
  463         vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
  464         vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
  465         /*
  466          * Install a default reset method for the ioctl support;
  467          * the driver can override this.
  468          */
  469         vap->iv_reset = default_reset;
  470 
  471         IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);
  472 
  473         ieee80211_sysctl_vattach(vap);
  474         ieee80211_crypto_vattach(vap);
  475         ieee80211_node_vattach(vap);
  476         ieee80211_power_vattach(vap);
  477         ieee80211_proto_vattach(vap);
  478 #ifdef IEEE80211_SUPPORT_SUPERG
  479         ieee80211_superg_vattach(vap);
  480 #endif
  481         ieee80211_ht_vattach(vap);
  482         ieee80211_scan_vattach(vap);
  483         ieee80211_regdomain_vattach(vap);
  484         ieee80211_radiotap_vattach(vap);
  485 
  486         return 0;
  487 }
  488 
  489 /*
  490  * Activate a vap.  State should have been prepared with a
  491  * call to ieee80211_vap_setup and by the driver.  On return
  492  * from this call the vap is ready for use.
  493  */
  494 int
  495 ieee80211_vap_attach(struct ieee80211vap *vap,
  496         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  497 {
  498         struct ifnet *ifp = vap->iv_ifp;
  499         struct ieee80211com *ic = vap->iv_ic;
  500         struct ifmediareq imr;
  501         int maxrate;
  502 
  503         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  504             "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
  505             __func__, ieee80211_opmode_name[vap->iv_opmode],
  506             ic->ic_ifp->if_xname, vap->iv_flags, vap->iv_flags_ext);
  507 
  508         /*
  509          * Do late attach work that cannot happen until after
  510          * the driver has had a chance to override defaults.
  511          */
  512         ieee80211_node_latevattach(vap);
  513         ieee80211_power_latevattach(vap);
  514 
  515         maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
  516             vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
  517         ieee80211_media_status(ifp, &imr);
  518         /* NB: strip explicit mode; we're actually in autoselect */
  519         ifmedia_set(&vap->iv_media,
  520             imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
  521         if (maxrate)
  522                 ifp->if_baudrate = IF_Mbps(maxrate);
  523 
  524         ether_ifattach(ifp, vap->iv_myaddr);
  525         if (vap->iv_opmode == IEEE80211_M_MONITOR) {
  526                 /* NB: disallow transmit */
  527                 ifp->if_transmit = null_transmit;
  528                 ifp->if_output = null_output;
  529         } else {
  530                 /* hook output method setup by ether_ifattach */
  531                 vap->iv_output = ifp->if_output;
  532                 ifp->if_output = ieee80211_output;
  533         }
  534         /* NB: if_mtu set by ether_ifattach to ETHERMTU */
  535 
  536         IEEE80211_LOCK(ic);
  537         TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
  538         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  539 #ifdef IEEE80211_SUPPORT_SUPERG
  540         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  541 #endif
  542         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  543         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  544         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  545         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  546         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  547         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  548         IEEE80211_UNLOCK(ic);
  549 
  550         return 1;
  551 }
  552 
  553 /* 
  554  * Tear down vap state and reclaim the ifnet.
  555  * The driver is assumed to have prepared for
  556  * this; e.g. by turning off interrupts for the
  557  * underlying device.
  558  */
  559 void
  560 ieee80211_vap_detach(struct ieee80211vap *vap)
  561 {
  562         struct ieee80211com *ic = vap->iv_ic;
  563         struct ifnet *ifp = vap->iv_ifp;
  564 
  565         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
  566             __func__, ieee80211_opmode_name[vap->iv_opmode],
  567             ic->ic_ifp->if_xname);
  568 
  569         /* NB: bpfdetach is called by ether_ifdetach and claims all taps */
  570         ether_ifdetach(ifp);
  571 
  572         ieee80211_stop(vap);
  573 
  574         /*
  575          * Flush any deferred vap tasks.
  576          */
  577         ieee80211_draintask(ic, &vap->iv_nstate_task);
  578         ieee80211_draintask(ic, &vap->iv_swbmiss_task);
  579 
  580         /* XXX band-aid until ifnet handles this for us */
  581         taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
  582 
  583         IEEE80211_LOCK(ic);
  584         KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
  585         TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
  586         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  587 #ifdef IEEE80211_SUPPORT_SUPERG
  588         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  589 #endif
  590         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  591         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  592         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  593         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  594         /* NB: this handles the bpfdetach done below */
  595         ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
  596         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  597         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  598         IEEE80211_UNLOCK(ic);
  599 
  600         ifmedia_removeall(&vap->iv_media);
  601 
  602         ieee80211_radiotap_vdetach(vap);
  603         ieee80211_regdomain_vdetach(vap);
  604         ieee80211_scan_vdetach(vap);
  605 #ifdef IEEE80211_SUPPORT_SUPERG
  606         ieee80211_superg_vdetach(vap);
  607 #endif
  608         ieee80211_ht_vdetach(vap);
  609         /* NB: must be before ieee80211_node_vdetach */
  610         ieee80211_proto_vdetach(vap);
  611         ieee80211_crypto_vdetach(vap);
  612         ieee80211_power_vdetach(vap);
  613         ieee80211_node_vdetach(vap);
  614         ieee80211_sysctl_vdetach(vap);
  615 
  616         if_free(ifp);
  617 }
  618 
  619 /*
  620  * Synchronize flag bit state in the parent ifnet structure
  621  * according to the state of all vap ifnet's.  This is used,
  622  * for example, to handle IFF_PROMISC and IFF_ALLMULTI.
  623  */
  624 void
  625 ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
  626 {
  627         struct ifnet *ifp = ic->ic_ifp;
  628         struct ieee80211vap *vap;
  629         int bit, oflags;
  630 
  631         IEEE80211_LOCK_ASSERT(ic);
  632 
  633         bit = 0;
  634         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  635                 if (vap->iv_ifp->if_flags & flag) {
  636                         /*
  637                          * XXX the bridge sets PROMISC but we don't want to
  638                          * enable it on the device, discard here so all the
  639                          * drivers don't need to special-case it
  640                          */
  641                         if (flag == IFF_PROMISC &&
  642                             !(vap->iv_opmode == IEEE80211_M_MONITOR ||
  643                               (vap->iv_opmode == IEEE80211_M_AHDEMO &&
  644                                (vap->iv_caps & IEEE80211_C_TDMA) == 0)))
  645                                 continue;
  646                         bit = 1;
  647                         break;
  648                 }
  649         oflags = ifp->if_flags;
  650         if (bit)
  651                 ifp->if_flags |= flag;
  652         else
  653                 ifp->if_flags &= ~flag;
  654         if ((ifp->if_flags ^ oflags) & flag) {
  655                 /* XXX should we return 1/0 and let caller do this? */
  656                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  657                         if (flag == IFF_PROMISC)
  658                                 ieee80211_runtask(ic, &ic->ic_promisc_task);
  659                         else if (flag == IFF_ALLMULTI)
  660                                 ieee80211_runtask(ic, &ic->ic_mcast_task);
  661                 }
  662         }
  663 }
  664 
  665 /*
  666  * Synchronize flag bit state in the com structure
  667  * according to the state of all vap's.  This is used,
  668  * for example, to handle state changes via ioctls.
  669  */
  670 static void
  671 ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
  672 {
  673         struct ieee80211vap *vap;
  674         int bit;
  675 
  676         IEEE80211_LOCK_ASSERT(ic);
  677 
  678         bit = 0;
  679         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  680                 if (vap->iv_flags & flag) {
  681                         bit = 1;
  682                         break;
  683                 }
  684         if (bit)
  685                 ic->ic_flags |= flag;
  686         else
  687                 ic->ic_flags &= ~flag;
  688 }
  689 
  690 void
  691 ieee80211_syncflag(struct ieee80211vap *vap, int flag)
  692 {
  693         struct ieee80211com *ic = vap->iv_ic;
  694 
  695         IEEE80211_LOCK(ic);
  696         if (flag < 0) {
  697                 flag = -flag;
  698                 vap->iv_flags &= ~flag;
  699         } else
  700                 vap->iv_flags |= flag;
  701         ieee80211_syncflag_locked(ic, flag);
  702         IEEE80211_UNLOCK(ic);
  703 }
  704 
  705 /*
  706  * Synchronize flags_ht bit state in the com structure
  707  * according to the state of all vap's.  This is used,
  708  * for example, to handle state changes via ioctls.
  709  */
  710 static void
  711 ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
  712 {
  713         struct ieee80211vap *vap;
  714         int bit;
  715 
  716         IEEE80211_LOCK_ASSERT(ic);
  717 
  718         bit = 0;
  719         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  720                 if (vap->iv_flags_ht & flag) {
  721                         bit = 1;
  722                         break;
  723                 }
  724         if (bit)
  725                 ic->ic_flags_ht |= flag;
  726         else
  727                 ic->ic_flags_ht &= ~flag;
  728 }
  729 
  730 void
  731 ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
  732 {
  733         struct ieee80211com *ic = vap->iv_ic;
  734 
  735         IEEE80211_LOCK(ic);
  736         if (flag < 0) {
  737                 flag = -flag;
  738                 vap->iv_flags_ht &= ~flag;
  739         } else
  740                 vap->iv_flags_ht |= flag;
  741         ieee80211_syncflag_ht_locked(ic, flag);
  742         IEEE80211_UNLOCK(ic);
  743 }
  744 
  745 /*
  746  * Synchronize flags_ext bit state in the com structure
  747  * according to the state of all vap's.  This is used,
  748  * for example, to handle state changes via ioctls.
  749  */
  750 static void
  751 ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
  752 {
  753         struct ieee80211vap *vap;
  754         int bit;
  755 
  756         IEEE80211_LOCK_ASSERT(ic);
  757 
  758         bit = 0;
  759         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  760                 if (vap->iv_flags_ext & flag) {
  761                         bit = 1;
  762                         break;
  763                 }
  764         if (bit)
  765                 ic->ic_flags_ext |= flag;
  766         else
  767                 ic->ic_flags_ext &= ~flag;
  768 }
  769 
  770 void
  771 ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
  772 {
  773         struct ieee80211com *ic = vap->iv_ic;
  774 
  775         IEEE80211_LOCK(ic);
  776         if (flag < 0) {
  777                 flag = -flag;
  778                 vap->iv_flags_ext &= ~flag;
  779         } else
  780                 vap->iv_flags_ext |= flag;
  781         ieee80211_syncflag_ext_locked(ic, flag);
  782         IEEE80211_UNLOCK(ic);
  783 }
  784 
  785 static __inline int
  786 mapgsm(u_int freq, u_int flags)
  787 {
  788         freq *= 10;
  789         if (flags & IEEE80211_CHAN_QUARTER)
  790                 freq += 5;
  791         else if (flags & IEEE80211_CHAN_HALF)
  792                 freq += 10;
  793         else
  794                 freq += 20;
  795         /* NB: there is no 907/20 wide but leave room */
  796         return (freq - 906*10) / 5;
  797 }
  798 
  799 static __inline int
  800 mappsb(u_int freq, u_int flags)
  801 {
  802         return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
  803 }
  804 
  805 /*
  806  * Convert MHz frequency to IEEE channel number.
  807  */
  808 int
  809 ieee80211_mhz2ieee(u_int freq, u_int flags)
  810 {
  811 #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
  812         if (flags & IEEE80211_CHAN_GSM)
  813                 return mapgsm(freq, flags);
  814         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  815                 if (freq == 2484)
  816                         return 14;
  817                 if (freq < 2484)
  818                         return ((int) freq - 2407) / 5;
  819                 else
  820                         return 15 + ((freq - 2512) / 20);
  821         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  822                 if (freq <= 5000) {
  823                         /* XXX check regdomain? */
  824                         if (IS_FREQ_IN_PSB(freq))
  825                                 return mappsb(freq, flags);
  826                         return (freq - 4000) / 5;
  827                 } else
  828                         return (freq - 5000) / 5;
  829         } else {                                /* either, guess */
  830                 if (freq == 2484)
  831                         return 14;
  832                 if (freq < 2484) {
  833                         if (907 <= freq && freq <= 922)
  834                                 return mapgsm(freq, flags);
  835                         return ((int) freq - 2407) / 5;
  836                 }
  837                 if (freq < 5000) {
  838                         if (IS_FREQ_IN_PSB(freq))
  839                                 return mappsb(freq, flags);
  840                         else if (freq > 4900)
  841                                 return (freq - 4000) / 5;
  842                         else
  843                                 return 15 + ((freq - 2512) / 20);
  844                 }
  845                 return (freq - 5000) / 5;
  846         }
  847 #undef IS_FREQ_IN_PSB
  848 }
  849 
  850 /*
  851  * Convert channel to IEEE channel number.
  852  */
  853 int
  854 ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
  855 {
  856         if (c == NULL) {
  857                 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
  858                 return 0;               /* XXX */
  859         }
  860         return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
  861 }
  862 
  863 /*
  864  * Convert IEEE channel number to MHz frequency.
  865  */
  866 u_int
  867 ieee80211_ieee2mhz(u_int chan, u_int flags)
  868 {
  869         if (flags & IEEE80211_CHAN_GSM)
  870                 return 907 + 5 * (chan / 10);
  871         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  872                 if (chan == 14)
  873                         return 2484;
  874                 if (chan < 14)
  875                         return 2407 + chan*5;
  876                 else
  877                         return 2512 + ((chan-15)*20);
  878         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  879                 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
  880                         chan -= 37;
  881                         return 4940 + chan*5 + (chan % 5 ? 2 : 0);
  882                 }
  883                 return 5000 + (chan*5);
  884         } else {                                /* either, guess */
  885                 /* XXX can't distinguish PSB+GSM channels */
  886                 if (chan == 14)
  887                         return 2484;
  888                 if (chan < 14)                  /* 0-13 */
  889                         return 2407 + chan*5;
  890                 if (chan < 27)                  /* 15-26 */
  891                         return 2512 + ((chan-15)*20);
  892                 return 5000 + (chan*5);
  893         }
  894 }
  895 
  896 /*
  897  * Locate a channel given a frequency+flags.  We cache
  898  * the previous lookup to optimize switching between two
  899  * channels--as happens with dynamic turbo.
  900  */
  901 struct ieee80211_channel *
  902 ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
  903 {
  904         struct ieee80211_channel *c;
  905         int i;
  906 
  907         flags &= IEEE80211_CHAN_ALLTURBO;
  908         c = ic->ic_prevchan;
  909         if (c != NULL && c->ic_freq == freq &&
  910             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  911                 return c;
  912         /* brute force search */
  913         for (i = 0; i < ic->ic_nchans; i++) {
  914                 c = &ic->ic_channels[i];
  915                 if (c->ic_freq == freq &&
  916                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  917                         return c;
  918         }
  919         return NULL;
  920 }
  921 
  922 /*
  923  * Locate a channel given a channel number+flags.  We cache
  924  * the previous lookup to optimize switching between two
  925  * channels--as happens with dynamic turbo.
  926  */
  927 struct ieee80211_channel *
  928 ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
  929 {
  930         struct ieee80211_channel *c;
  931         int i;
  932 
  933         flags &= IEEE80211_CHAN_ALLTURBO;
  934         c = ic->ic_prevchan;
  935         if (c != NULL && c->ic_ieee == ieee &&
  936             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  937                 return c;
  938         /* brute force search */
  939         for (i = 0; i < ic->ic_nchans; i++) {
  940                 c = &ic->ic_channels[i];
  941                 if (c->ic_ieee == ieee &&
  942                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  943                         return c;
  944         }
  945         return NULL;
  946 }
  947 
  948 static void
  949 addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
  950 {
  951 #define ADD(_ic, _s, _o) \
  952         ifmedia_add(media, \
  953                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
  954         static const u_int mopts[IEEE80211_MODE_MAX] = { 
  955             [IEEE80211_MODE_AUTO]       = IFM_AUTO,
  956             [IEEE80211_MODE_11A]        = IFM_IEEE80211_11A,
  957             [IEEE80211_MODE_11B]        = IFM_IEEE80211_11B,
  958             [IEEE80211_MODE_11G]        = IFM_IEEE80211_11G,
  959             [IEEE80211_MODE_FH]         = IFM_IEEE80211_FH,
  960             [IEEE80211_MODE_TURBO_A]    = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  961             [IEEE80211_MODE_TURBO_G]    = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
  962             [IEEE80211_MODE_STURBO_A]   = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  963             [IEEE80211_MODE_HALF]       = IFM_IEEE80211_11A,    /* XXX */
  964             [IEEE80211_MODE_QUARTER]    = IFM_IEEE80211_11A,    /* XXX */
  965             [IEEE80211_MODE_11NA]       = IFM_IEEE80211_11NA,
  966             [IEEE80211_MODE_11NG]       = IFM_IEEE80211_11NG,
  967         };
  968         u_int mopt;
  969 
  970         mopt = mopts[mode];
  971         if (addsta)
  972                 ADD(ic, mword, mopt);   /* STA mode has no cap */
  973         if (caps & IEEE80211_C_IBSS)
  974                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
  975         if (caps & IEEE80211_C_HOSTAP)
  976                 ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
  977         if (caps & IEEE80211_C_AHDEMO)
  978                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  979         if (caps & IEEE80211_C_MONITOR)
  980                 ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
  981         if (caps & IEEE80211_C_WDS)
  982                 ADD(media, mword, mopt | IFM_IEEE80211_WDS);
  983         if (caps & IEEE80211_C_MBSS)
  984                 ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
  985 #undef ADD
  986 }
  987 
  988 /*
  989  * Setup the media data structures according to the channel and
  990  * rate tables.
  991  */
  992 static int
  993 ieee80211_media_setup(struct ieee80211com *ic,
  994         struct ifmedia *media, int caps, int addsta,
  995         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  996 {
  997         int i, j, mode, rate, maxrate, mword, r;
  998         const struct ieee80211_rateset *rs;
  999         struct ieee80211_rateset allrates;
 1000 
 1001         /*
 1002          * Fill in media characteristics.
 1003          */
 1004         ifmedia_init(media, 0, media_change, media_stat);
 1005         maxrate = 0;
 1006         /*
 1007          * Add media for legacy operating modes.
 1008          */
 1009         memset(&allrates, 0, sizeof(allrates));
 1010         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
 1011                 if (isclr(ic->ic_modecaps, mode))
 1012                         continue;
 1013                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1014                 if (mode == IEEE80211_MODE_AUTO)
 1015                         continue;
 1016                 rs = &ic->ic_sup_rates[mode];
 1017                 for (i = 0; i < rs->rs_nrates; i++) {
 1018                         rate = rs->rs_rates[i];
 1019                         mword = ieee80211_rate2media(ic, rate, mode);
 1020                         if (mword == 0)
 1021                                 continue;
 1022                         addmedia(media, caps, addsta, mode, mword);
 1023                         /*
 1024                          * Add legacy rate to the collection of all rates.
 1025                          */
 1026                         r = rate & IEEE80211_RATE_VAL;
 1027                         for (j = 0; j < allrates.rs_nrates; j++)
 1028                                 if (allrates.rs_rates[j] == r)
 1029                                         break;
 1030                         if (j == allrates.rs_nrates) {
 1031                                 /* unique, add to the set */
 1032                                 allrates.rs_rates[j] = r;
 1033                                 allrates.rs_nrates++;
 1034                         }
 1035                         rate = (rate & IEEE80211_RATE_VAL) / 2;
 1036                         if (rate > maxrate)
 1037                                 maxrate = rate;
 1038                 }
 1039         }
 1040         for (i = 0; i < allrates.rs_nrates; i++) {
 1041                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
 1042                                 IEEE80211_MODE_AUTO);
 1043                 if (mword == 0)
 1044                         continue;
 1045                 /* NB: remove media options from mword */
 1046                 addmedia(media, caps, addsta,
 1047                     IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
 1048         }
 1049         /*
 1050          * Add HT/11n media.  Note that we do not have enough
 1051          * bits in the media subtype to express the MCS so we
 1052          * use a "placeholder" media subtype and any fixed MCS
 1053          * must be specified with a different mechanism.
 1054          */
 1055         for (; mode <= IEEE80211_MODE_11NG; mode++) {
 1056                 if (isclr(ic->ic_modecaps, mode))
 1057                         continue;
 1058                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1059                 addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
 1060         }
 1061         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
 1062             isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
 1063                 addmedia(media, caps, addsta,
 1064                     IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
 1065                 /* XXX could walk htrates */
 1066                 /* XXX known array size */
 1067                 if (ieee80211_htrates[15].ht40_rate_400ns > maxrate)
 1068                         maxrate = ieee80211_htrates[15].ht40_rate_400ns;
 1069         }
 1070         return maxrate;
 1071 }
 1072 
 1073 void
 1074 ieee80211_media_init(struct ieee80211com *ic)
 1075 {
 1076         struct ifnet *ifp = ic->ic_ifp;
 1077         int maxrate;
 1078 
 1079         /* NB: this works because the structure is initialized to zero */
 1080         if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
 1081                 /*
 1082                  * We are re-initializing the channel list; clear
 1083                  * the existing media state as the media routines
 1084                  * don't suppress duplicates.
 1085                  */
 1086                 ifmedia_removeall(&ic->ic_media);
 1087         }
 1088         ieee80211_chan_init(ic);
 1089 
 1090         /*
 1091          * Recalculate media settings in case new channel list changes
 1092          * the set of available modes.
 1093          */
 1094         maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
 1095                 ieee80211com_media_change, ieee80211com_media_status);
 1096         /* NB: strip explicit mode; we're actually in autoselect */
 1097         ifmedia_set(&ic->ic_media,
 1098             media_status(ic->ic_opmode, ic->ic_curchan) &~
 1099                 (IFM_MMASK | IFM_IEEE80211_TURBO));
 1100         if (maxrate)
 1101                 ifp->if_baudrate = IF_Mbps(maxrate);
 1102 
 1103         /* XXX need to propagate new media settings to vap's */
 1104 }
 1105 
 1106 /* XXX inline or eliminate? */
 1107 const struct ieee80211_rateset *
 1108 ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
 1109 {
 1110         /* XXX does this work for 11ng basic rates? */
 1111         return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
 1112 }
 1113 
 1114 void
 1115 ieee80211_announce(struct ieee80211com *ic)
 1116 {
 1117         struct ifnet *ifp = ic->ic_ifp;
 1118         int i, mode, rate, mword;
 1119         const struct ieee80211_rateset *rs;
 1120 
 1121         /* NB: skip AUTO since it has no rates */
 1122         for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
 1123                 if (isclr(ic->ic_modecaps, mode))
 1124                         continue;
 1125                 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
 1126                 rs = &ic->ic_sup_rates[mode];
 1127                 for (i = 0; i < rs->rs_nrates; i++) {
 1128                         mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
 1129                         if (mword == 0)
 1130                                 continue;
 1131                         rate = ieee80211_media2rate(mword);
 1132                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
 1133                             rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
 1134                 }
 1135                 printf("\n");
 1136         }
 1137         ieee80211_ht_announce(ic);
 1138 }
 1139 
 1140 void
 1141 ieee80211_announce_channels(struct ieee80211com *ic)
 1142 {
 1143         const struct ieee80211_channel *c;
 1144         char type;
 1145         int i, cw;
 1146 
 1147         printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
 1148         for (i = 0; i < ic->ic_nchans; i++) {
 1149                 c = &ic->ic_channels[i];
 1150                 if (IEEE80211_IS_CHAN_ST(c))
 1151                         type = 'S';
 1152                 else if (IEEE80211_IS_CHAN_108A(c))
 1153                         type = 'T';
 1154                 else if (IEEE80211_IS_CHAN_108G(c))
 1155                         type = 'G';
 1156                 else if (IEEE80211_IS_CHAN_HT(c))
 1157                         type = 'n';
 1158                 else if (IEEE80211_IS_CHAN_A(c))
 1159                         type = 'a';
 1160                 else if (IEEE80211_IS_CHAN_ANYG(c))
 1161                         type = 'g';
 1162                 else if (IEEE80211_IS_CHAN_B(c))
 1163                         type = 'b';
 1164                 else
 1165                         type = 'f';
 1166                 if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
 1167                         cw = 40;
 1168                 else if (IEEE80211_IS_CHAN_HALF(c))
 1169                         cw = 10;
 1170                 else if (IEEE80211_IS_CHAN_QUARTER(c))
 1171                         cw = 5;
 1172                 else
 1173                         cw = 20;
 1174                 printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
 1175                         , c->ic_ieee, c->ic_freq, type
 1176                         , cw
 1177                         , IEEE80211_IS_CHAN_HT40U(c) ? '+' :
 1178                           IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
 1179                         , c->ic_maxregpower
 1180                         , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
 1181                         , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
 1182                 );
 1183         }
 1184 }
 1185 
 1186 static int
 1187 media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
 1188 {
 1189         switch (IFM_MODE(ime->ifm_media)) {
 1190         case IFM_IEEE80211_11A:
 1191                 *mode = IEEE80211_MODE_11A;
 1192                 break;
 1193         case IFM_IEEE80211_11B:
 1194                 *mode = IEEE80211_MODE_11B;
 1195                 break;
 1196         case IFM_IEEE80211_11G:
 1197                 *mode = IEEE80211_MODE_11G;
 1198                 break;
 1199         case IFM_IEEE80211_FH:
 1200                 *mode = IEEE80211_MODE_FH;
 1201                 break;
 1202         case IFM_IEEE80211_11NA:
 1203                 *mode = IEEE80211_MODE_11NA;
 1204                 break;
 1205         case IFM_IEEE80211_11NG:
 1206                 *mode = IEEE80211_MODE_11NG;
 1207                 break;
 1208         case IFM_AUTO:
 1209                 *mode = IEEE80211_MODE_AUTO;
 1210                 break;
 1211         default:
 1212                 return 0;
 1213         }
 1214         /*
 1215          * Turbo mode is an ``option''.
 1216          * XXX does not apply to AUTO
 1217          */
 1218         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
 1219                 if (*mode == IEEE80211_MODE_11A) {
 1220                         if (flags & IEEE80211_F_TURBOP)
 1221                                 *mode = IEEE80211_MODE_TURBO_A;
 1222                         else
 1223                                 *mode = IEEE80211_MODE_STURBO_A;
 1224                 } else if (*mode == IEEE80211_MODE_11G)
 1225                         *mode = IEEE80211_MODE_TURBO_G;
 1226                 else
 1227                         return 0;
 1228         }
 1229         /* XXX HT40 +/- */
 1230         return 1;
 1231 }
 1232 
 1233 /*
 1234  * Handle a media change request on the underlying interface.
 1235  */
 1236 int
 1237 ieee80211com_media_change(struct ifnet *ifp)
 1238 {
 1239         return EINVAL;
 1240 }
 1241 
 1242 /*
 1243  * Handle a media change request on the vap interface.
 1244  */
 1245 int
 1246 ieee80211_media_change(struct ifnet *ifp)
 1247 {
 1248         struct ieee80211vap *vap = ifp->if_softc;
 1249         struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
 1250         uint16_t newmode;
 1251 
 1252         if (!media2mode(ime, vap->iv_flags, &newmode))
 1253                 return EINVAL;
 1254         if (vap->iv_des_mode != newmode) {
 1255                 vap->iv_des_mode = newmode;
 1256                 /* XXX kick state machine if up+running */
 1257         }
 1258         return 0;
 1259 }
 1260 
 1261 /*
 1262  * Common code to calculate the media status word
 1263  * from the operating mode and channel state.
 1264  */
 1265 static int
 1266 media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
 1267 {
 1268         int status;
 1269 
 1270         status = IFM_IEEE80211;
 1271         switch (opmode) {
 1272         case IEEE80211_M_STA:
 1273                 break;
 1274         case IEEE80211_M_IBSS:
 1275                 status |= IFM_IEEE80211_ADHOC;
 1276                 break;
 1277         case IEEE80211_M_HOSTAP:
 1278                 status |= IFM_IEEE80211_HOSTAP;
 1279                 break;
 1280         case IEEE80211_M_MONITOR:
 1281                 status |= IFM_IEEE80211_MONITOR;
 1282                 break;
 1283         case IEEE80211_M_AHDEMO:
 1284                 status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
 1285                 break;
 1286         case IEEE80211_M_WDS:
 1287                 status |= IFM_IEEE80211_WDS;
 1288                 break;
 1289         case IEEE80211_M_MBSS:
 1290                 status |= IFM_IEEE80211_MBSS;
 1291                 break;
 1292         }
 1293         if (IEEE80211_IS_CHAN_HTA(chan)) {
 1294                 status |= IFM_IEEE80211_11NA;
 1295         } else if (IEEE80211_IS_CHAN_HTG(chan)) {
 1296                 status |= IFM_IEEE80211_11NG;
 1297         } else if (IEEE80211_IS_CHAN_A(chan)) {
 1298                 status |= IFM_IEEE80211_11A;
 1299         } else if (IEEE80211_IS_CHAN_B(chan)) {
 1300                 status |= IFM_IEEE80211_11B;
 1301         } else if (IEEE80211_IS_CHAN_ANYG(chan)) {
 1302                 status |= IFM_IEEE80211_11G;
 1303         } else if (IEEE80211_IS_CHAN_FHSS(chan)) {
 1304                 status |= IFM_IEEE80211_FH;
 1305         }
 1306         /* XXX else complain? */
 1307 
 1308         if (IEEE80211_IS_CHAN_TURBO(chan))
 1309                 status |= IFM_IEEE80211_TURBO;
 1310 #if 0
 1311         if (IEEE80211_IS_CHAN_HT20(chan))
 1312                 status |= IFM_IEEE80211_HT20;
 1313         if (IEEE80211_IS_CHAN_HT40(chan))
 1314                 status |= IFM_IEEE80211_HT40;
 1315 #endif
 1316         return status;
 1317 }
 1318 
 1319 static void
 1320 ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1321 {
 1322         struct ieee80211com *ic = ifp->if_l2com;
 1323         struct ieee80211vap *vap;
 1324 
 1325         imr->ifm_status = IFM_AVALID;
 1326         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 1327                 if (vap->iv_ifp->if_flags & IFF_UP) {
 1328                         imr->ifm_status |= IFM_ACTIVE;
 1329                         break;
 1330                 }
 1331         imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
 1332         if (imr->ifm_status & IFM_ACTIVE)
 1333                 imr->ifm_current = imr->ifm_active;
 1334 }
 1335 
 1336 void
 1337 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1338 {
 1339         struct ieee80211vap *vap = ifp->if_softc;
 1340         struct ieee80211com *ic = vap->iv_ic;
 1341         enum ieee80211_phymode mode;
 1342 
 1343         imr->ifm_status = IFM_AVALID;
 1344         /*
 1345          * NB: use the current channel's mode to lock down a xmit
 1346          * rate only when running; otherwise we may have a mismatch
 1347          * in which case the rate will not be convertible.
 1348          */
 1349         if (vap->iv_state == IEEE80211_S_RUN) {
 1350                 imr->ifm_status |= IFM_ACTIVE;
 1351                 mode = ieee80211_chan2mode(ic->ic_curchan);
 1352         } else
 1353                 mode = IEEE80211_MODE_AUTO;
 1354         imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
 1355         /*
 1356          * Calculate a current rate if possible.
 1357          */
 1358         if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
 1359                 /*
 1360                  * A fixed rate is set, report that.
 1361                  */
 1362                 imr->ifm_active |= ieee80211_rate2media(ic,
 1363                         vap->iv_txparms[mode].ucastrate, mode);
 1364         } else if (vap->iv_opmode == IEEE80211_M_STA) {
 1365                 /*
 1366                  * In station mode report the current transmit rate.
 1367                  */
 1368                 imr->ifm_active |= ieee80211_rate2media(ic,
 1369                         vap->iv_bss->ni_txrate, mode);
 1370         } else
 1371                 imr->ifm_active |= IFM_AUTO;
 1372         if (imr->ifm_status & IFM_ACTIVE)
 1373                 imr->ifm_current = imr->ifm_active;
 1374 }
 1375 
 1376 /*
 1377  * Set the current phy mode and recalculate the active channel
 1378  * set based on the available channels for this mode.  Also
 1379  * select a new default/current channel if the current one is
 1380  * inappropriate for this mode.
 1381  */
 1382 int
 1383 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
 1384 {
 1385         /*
 1386          * Adjust basic rates in 11b/11g supported rate set.
 1387          * Note that if operating on a hal/quarter rate channel
 1388          * this is a noop as those rates sets are different
 1389          * and used instead.
 1390          */
 1391         if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
 1392                 ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
 1393 
 1394         ic->ic_curmode = mode;
 1395         ieee80211_reset_erp(ic);        /* reset ERP state */
 1396 
 1397         return 0;
 1398 }
 1399 
 1400 /*
 1401  * Return the phy mode for with the specified channel.
 1402  */
 1403 enum ieee80211_phymode
 1404 ieee80211_chan2mode(const struct ieee80211_channel *chan)
 1405 {
 1406 
 1407         if (IEEE80211_IS_CHAN_HTA(chan))
 1408                 return IEEE80211_MODE_11NA;
 1409         else if (IEEE80211_IS_CHAN_HTG(chan))
 1410                 return IEEE80211_MODE_11NG;
 1411         else if (IEEE80211_IS_CHAN_108G(chan))
 1412                 return IEEE80211_MODE_TURBO_G;
 1413         else if (IEEE80211_IS_CHAN_ST(chan))
 1414                 return IEEE80211_MODE_STURBO_A;
 1415         else if (IEEE80211_IS_CHAN_TURBO(chan))
 1416                 return IEEE80211_MODE_TURBO_A;
 1417         else if (IEEE80211_IS_CHAN_HALF(chan))
 1418                 return IEEE80211_MODE_HALF;
 1419         else if (IEEE80211_IS_CHAN_QUARTER(chan))
 1420                 return IEEE80211_MODE_QUARTER;
 1421         else if (IEEE80211_IS_CHAN_A(chan))
 1422                 return IEEE80211_MODE_11A;
 1423         else if (IEEE80211_IS_CHAN_ANYG(chan))
 1424                 return IEEE80211_MODE_11G;
 1425         else if (IEEE80211_IS_CHAN_B(chan))
 1426                 return IEEE80211_MODE_11B;
 1427         else if (IEEE80211_IS_CHAN_FHSS(chan))
 1428                 return IEEE80211_MODE_FH;
 1429 
 1430         /* NB: should not get here */
 1431         printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
 1432                 __func__, chan->ic_freq, chan->ic_flags);
 1433         return IEEE80211_MODE_11B;
 1434 }
 1435 
 1436 struct ratemedia {
 1437         u_int   match;  /* rate + mode */
 1438         u_int   media;  /* if_media rate */
 1439 };
 1440 
 1441 static int
 1442 findmedia(const struct ratemedia rates[], int n, u_int match)
 1443 {
 1444         int i;
 1445 
 1446         for (i = 0; i < n; i++)
 1447                 if (rates[i].match == match)
 1448                         return rates[i].media;
 1449         return IFM_AUTO;
 1450 }
 1451 
 1452 /*
 1453  * Convert IEEE80211 rate value to ifmedia subtype.
 1454  * Rate is either a legacy rate in units of 0.5Mbps
 1455  * or an MCS index.
 1456  */
 1457 int
 1458 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
 1459 {
 1460 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1461         static const struct ratemedia rates[] = {
 1462                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
 1463                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
 1464                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
 1465                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
 1466                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
 1467                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
 1468                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
 1469                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
 1470                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
 1471                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
 1472                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
 1473                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
 1474                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
 1475                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
 1476                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
 1477                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
 1478                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
 1479                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
 1480                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
 1481                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
 1482                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
 1483                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
 1484                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
 1485                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
 1486                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
 1487                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
 1488                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
 1489                 {   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
 1490                 {   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
 1491                 {  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
 1492                 /* NB: OFDM72 doesn't realy exist so we don't handle it */
 1493         };
 1494         static const struct ratemedia htrates[] = {
 1495                 {   0, IFM_IEEE80211_MCS },
 1496                 {   1, IFM_IEEE80211_MCS },
 1497                 {   2, IFM_IEEE80211_MCS },
 1498                 {   3, IFM_IEEE80211_MCS },
 1499                 {   4, IFM_IEEE80211_MCS },
 1500                 {   5, IFM_IEEE80211_MCS },
 1501                 {   6, IFM_IEEE80211_MCS },
 1502                 {   7, IFM_IEEE80211_MCS },
 1503                 {   8, IFM_IEEE80211_MCS },
 1504                 {   9, IFM_IEEE80211_MCS },
 1505                 {  10, IFM_IEEE80211_MCS },
 1506                 {  11, IFM_IEEE80211_MCS },
 1507                 {  12, IFM_IEEE80211_MCS },
 1508                 {  13, IFM_IEEE80211_MCS },
 1509                 {  14, IFM_IEEE80211_MCS },
 1510                 {  15, IFM_IEEE80211_MCS },
 1511         };
 1512         int m;
 1513 
 1514         /*
 1515          * Check 11n rates first for match as an MCS.
 1516          */
 1517         if (mode == IEEE80211_MODE_11NA) {
 1518                 if (rate & IEEE80211_RATE_MCS) {
 1519                         rate &= ~IEEE80211_RATE_MCS;
 1520                         m = findmedia(htrates, N(htrates), rate);
 1521                         if (m != IFM_AUTO)
 1522                                 return m | IFM_IEEE80211_11NA;
 1523                 }
 1524         } else if (mode == IEEE80211_MODE_11NG) {
 1525                 /* NB: 12 is ambiguous, it will be treated as an MCS */
 1526                 if (rate & IEEE80211_RATE_MCS) {
 1527                         rate &= ~IEEE80211_RATE_MCS;
 1528                         m = findmedia(htrates, N(htrates), rate);
 1529                         if (m != IFM_AUTO)
 1530                                 return m | IFM_IEEE80211_11NG;
 1531                 }
 1532         }
 1533         rate &= IEEE80211_RATE_VAL;
 1534         switch (mode) {
 1535         case IEEE80211_MODE_11A:
 1536         case IEEE80211_MODE_HALF:               /* XXX good 'nuf */
 1537         case IEEE80211_MODE_QUARTER:
 1538         case IEEE80211_MODE_11NA:
 1539         case IEEE80211_MODE_TURBO_A:
 1540         case IEEE80211_MODE_STURBO_A:
 1541                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11A);
 1542         case IEEE80211_MODE_11B:
 1543                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B);
 1544         case IEEE80211_MODE_FH:
 1545                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH);
 1546         case IEEE80211_MODE_AUTO:
 1547                 /* NB: ic may be NULL for some drivers */
 1548                 if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
 1549                         return findmedia(rates, N(rates),
 1550                             rate | IFM_IEEE80211_FH);
 1551                 /* NB: hack, 11g matches both 11b+11a rates */
 1552                 /* fall thru... */
 1553         case IEEE80211_MODE_11G:
 1554         case IEEE80211_MODE_11NG:
 1555         case IEEE80211_MODE_TURBO_G:
 1556                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11G);
 1557         }
 1558         return IFM_AUTO;
 1559 #undef N
 1560 }
 1561 
 1562 int
 1563 ieee80211_media2rate(int mword)
 1564 {
 1565 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1566         static const int ieeerates[] = {
 1567                 -1,             /* IFM_AUTO */
 1568                 0,              /* IFM_MANUAL */
 1569                 0,              /* IFM_NONE */
 1570                 2,              /* IFM_IEEE80211_FH1 */
 1571                 4,              /* IFM_IEEE80211_FH2 */
 1572                 2,              /* IFM_IEEE80211_DS1 */
 1573                 4,              /* IFM_IEEE80211_DS2 */
 1574                 11,             /* IFM_IEEE80211_DS5 */
 1575                 22,             /* IFM_IEEE80211_DS11 */
 1576                 44,             /* IFM_IEEE80211_DS22 */
 1577                 12,             /* IFM_IEEE80211_OFDM6 */
 1578                 18,             /* IFM_IEEE80211_OFDM9 */
 1579                 24,             /* IFM_IEEE80211_OFDM12 */
 1580                 36,             /* IFM_IEEE80211_OFDM18 */
 1581                 48,             /* IFM_IEEE80211_OFDM24 */
 1582                 72,             /* IFM_IEEE80211_OFDM36 */
 1583                 96,             /* IFM_IEEE80211_OFDM48 */
 1584                 108,            /* IFM_IEEE80211_OFDM54 */
 1585                 144,            /* IFM_IEEE80211_OFDM72 */
 1586                 0,              /* IFM_IEEE80211_DS354k */
 1587                 0,              /* IFM_IEEE80211_DS512k */
 1588                 6,              /* IFM_IEEE80211_OFDM3 */
 1589                 9,              /* IFM_IEEE80211_OFDM4 */
 1590                 54,             /* IFM_IEEE80211_OFDM27 */
 1591                 -1,             /* IFM_IEEE80211_MCS */
 1592         };
 1593         return IFM_SUBTYPE(mword) < N(ieeerates) ?
 1594                 ieeerates[IFM_SUBTYPE(mword)] : 0;
 1595 #undef N
 1596 }
 1597 
 1598 /*
 1599  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 1600  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 1601  */
 1602 #define mix(a, b, c)                                                    \
 1603 do {                                                                    \
 1604         a -= b; a -= c; a ^= (c >> 13);                                 \
 1605         b -= c; b -= a; b ^= (a << 8);                                  \
 1606         c -= a; c -= b; c ^= (b >> 13);                                 \
 1607         a -= b; a -= c; a ^= (c >> 12);                                 \
 1608         b -= c; b -= a; b ^= (a << 16);                                 \
 1609         c -= a; c -= b; c ^= (b >> 5);                                  \
 1610         a -= b; a -= c; a ^= (c >> 3);                                  \
 1611         b -= c; b -= a; b ^= (a << 10);                                 \
 1612         c -= a; c -= b; c ^= (b >> 15);                                 \
 1613 } while (/*CONSTCOND*/0)
 1614 
 1615 uint32_t
 1616 ieee80211_mac_hash(const struct ieee80211com *ic,
 1617         const uint8_t addr[IEEE80211_ADDR_LEN])
 1618 {
 1619         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
 1620 
 1621         b += addr[5] << 8;
 1622         b += addr[4];
 1623         a += addr[3] << 24;
 1624         a += addr[2] << 16;
 1625         a += addr[1] << 8;
 1626         a += addr[0];
 1627 
 1628         mix(a, b, c);
 1629 
 1630         return c;
 1631 }
 1632 #undef mix

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