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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/9/sys/net80211/ieee80211.c 234753 2012-04-28 09:15:01Z dim $");
   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          * Setup required information to fill the mcsset field, if driver did
  210          * not. Assume a 2T2R setup for historic reasons.
  211          */
  212         if (ic->ic_rxstream == 0)
  213                 ic->ic_rxstream = 2;
  214         if (ic->ic_txstream == 0)
  215                 ic->ic_txstream = 2;
  216 
  217         /*
  218          * Set auto mode to reset active channel state and any desired channel.
  219          */
  220         (void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
  221 #undef DEFAULTRATES
  222 }
  223 
  224 static void
  225 null_update_mcast(struct ifnet *ifp)
  226 {
  227         if_printf(ifp, "need multicast update callback\n");
  228 }
  229 
  230 static void
  231 null_update_promisc(struct ifnet *ifp)
  232 {
  233         if_printf(ifp, "need promiscuous mode update callback\n");
  234 }
  235 
  236 static int
  237 null_transmit(struct ifnet *ifp, struct mbuf *m)
  238 {
  239         m_freem(m);
  240         ifp->if_oerrors++;
  241         return EACCES;          /* XXX EIO/EPERM? */
  242 }
  243 
  244 static int
  245 null_output(struct ifnet *ifp, struct mbuf *m,
  246         struct sockaddr *dst, struct route *ro)
  247 {
  248         if_printf(ifp, "discard raw packet\n");
  249         return null_transmit(ifp, m);
  250 }
  251 
  252 static void
  253 null_input(struct ifnet *ifp, struct mbuf *m)
  254 {
  255         if_printf(ifp, "if_input should not be called\n");
  256         m_freem(m);
  257 }
  258 
  259 /*
  260  * Attach/setup the common net80211 state.  Called by
  261  * the driver on attach to prior to creating any vap's.
  262  */
  263 void
  264 ieee80211_ifattach(struct ieee80211com *ic,
  265         const uint8_t macaddr[IEEE80211_ADDR_LEN])
  266 {
  267         struct ifnet *ifp = ic->ic_ifp;
  268         struct sockaddr_dl *sdl;
  269         struct ifaddr *ifa;
  270 
  271         KASSERT(ifp->if_type == IFT_IEEE80211, ("if_type %d", ifp->if_type));
  272 
  273         IEEE80211_LOCK_INIT(ic, ifp->if_xname);
  274         TAILQ_INIT(&ic->ic_vaps);
  275 
  276         /* Create a taskqueue for all state changes */
  277         ic->ic_tq = taskqueue_create("ic_taskq", M_WAITOK | M_ZERO,
  278             taskqueue_thread_enqueue, &ic->ic_tq);
  279         taskqueue_start_threads(&ic->ic_tq, 1, PI_NET, "%s taskq",
  280             ifp->if_xname);
  281         /*
  282          * Fill in 802.11 available channel set, mark all
  283          * available channels as active, and pick a default
  284          * channel if not already specified.
  285          */
  286         ieee80211_media_init(ic);
  287 
  288         ic->ic_update_mcast = null_update_mcast;
  289         ic->ic_update_promisc = null_update_promisc;
  290 
  291         ic->ic_hash_key = arc4random();
  292         ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
  293         ic->ic_lintval = ic->ic_bintval;
  294         ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
  295 
  296         ieee80211_crypto_attach(ic);
  297         ieee80211_node_attach(ic);
  298         ieee80211_power_attach(ic);
  299         ieee80211_proto_attach(ic);
  300 #ifdef IEEE80211_SUPPORT_SUPERG
  301         ieee80211_superg_attach(ic);
  302 #endif
  303         ieee80211_ht_attach(ic);
  304         ieee80211_scan_attach(ic);
  305         ieee80211_regdomain_attach(ic);
  306         ieee80211_dfs_attach(ic);
  307 
  308         ieee80211_sysctl_attach(ic);
  309 
  310         ifp->if_addrlen = IEEE80211_ADDR_LEN;
  311         ifp->if_hdrlen = 0;
  312         if_attach(ifp);
  313         ifp->if_mtu = IEEE80211_MTU_MAX;
  314         ifp->if_broadcastaddr = ieee80211broadcastaddr;
  315         ifp->if_output = null_output;
  316         ifp->if_input = null_input;     /* just in case */
  317         ifp->if_resolvemulti = NULL;    /* NB: callers check */
  318 
  319         ifa = ifaddr_byindex(ifp->if_index);
  320         KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
  321         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  322         sdl->sdl_type = IFT_ETHER;              /* XXX IFT_IEEE80211? */
  323         sdl->sdl_alen = IEEE80211_ADDR_LEN;
  324         IEEE80211_ADDR_COPY(LLADDR(sdl), macaddr);
  325         ifa_free(ifa);
  326 }
  327 
  328 /*
  329  * Detach net80211 state on device detach.  Tear down
  330  * all vap's and reclaim all common state prior to the
  331  * device state going away.  Note we may call back into
  332  * driver; it must be prepared for this.
  333  */
  334 void
  335 ieee80211_ifdetach(struct ieee80211com *ic)
  336 {
  337         struct ifnet *ifp = ic->ic_ifp;
  338         struct ieee80211vap *vap;
  339 
  340         if_detach(ifp);
  341 
  342         while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
  343                 ieee80211_vap_destroy(vap);
  344         ieee80211_waitfor_parent(ic);
  345 
  346         ieee80211_sysctl_detach(ic);
  347         ieee80211_dfs_detach(ic);
  348         ieee80211_regdomain_detach(ic);
  349         ieee80211_scan_detach(ic);
  350 #ifdef IEEE80211_SUPPORT_SUPERG
  351         ieee80211_superg_detach(ic);
  352 #endif
  353         ieee80211_ht_detach(ic);
  354         /* NB: must be called before ieee80211_node_detach */
  355         ieee80211_proto_detach(ic);
  356         ieee80211_crypto_detach(ic);
  357         ieee80211_power_detach(ic);
  358         ieee80211_node_detach(ic);
  359 
  360         ifmedia_removeall(&ic->ic_media);
  361         taskqueue_free(ic->ic_tq);
  362         IEEE80211_LOCK_DESTROY(ic);
  363 }
  364 
  365 /*
  366  * Default reset method for use with the ioctl support.  This
  367  * method is invoked after any state change in the 802.11
  368  * layer that should be propagated to the hardware but not
  369  * require re-initialization of the 802.11 state machine (e.g
  370  * rescanning for an ap).  We always return ENETRESET which
  371  * should cause the driver to re-initialize the device. Drivers
  372  * can override this method to implement more optimized support.
  373  */
  374 static int
  375 default_reset(struct ieee80211vap *vap, u_long cmd)
  376 {
  377         return ENETRESET;
  378 }
  379 
  380 /*
  381  * Prepare a vap for use.  Drivers use this call to
  382  * setup net80211 state in new vap's prior attaching
  383  * them with ieee80211_vap_attach (below).
  384  */
  385 int
  386 ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
  387     const char name[IFNAMSIZ], int unit, enum ieee80211_opmode opmode,
  388     int flags, const uint8_t bssid[IEEE80211_ADDR_LEN],
  389     const uint8_t macaddr[IEEE80211_ADDR_LEN])
  390 {
  391         struct ifnet *ifp;
  392 
  393         ifp = if_alloc(IFT_ETHER);
  394         if (ifp == NULL) {
  395                 if_printf(ic->ic_ifp, "%s: unable to allocate ifnet\n",
  396                     __func__);
  397                 return ENOMEM;
  398         }
  399         if_initname(ifp, name, unit);
  400         ifp->if_softc = vap;                    /* back pointer */
  401         ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
  402         ifp->if_start = ieee80211_start;
  403         ifp->if_ioctl = ieee80211_ioctl;
  404         ifp->if_init = ieee80211_init;
  405         /* NB: input+output filled in by ether_ifattach */
  406         IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
  407         ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
  408         IFQ_SET_READY(&ifp->if_snd);
  409 
  410         vap->iv_ifp = ifp;
  411         vap->iv_ic = ic;
  412         vap->iv_flags = ic->ic_flags;           /* propagate common flags */
  413         vap->iv_flags_ext = ic->ic_flags_ext;
  414         vap->iv_flags_ven = ic->ic_flags_ven;
  415         vap->iv_caps = ic->ic_caps &~ IEEE80211_C_OPMODE;
  416         vap->iv_htcaps = ic->ic_htcaps;
  417         vap->iv_htextcaps = ic->ic_htextcaps;
  418         vap->iv_opmode = opmode;
  419         vap->iv_caps |= ieee80211_opcap[opmode];
  420         switch (opmode) {
  421         case IEEE80211_M_WDS:
  422                 /*
  423                  * WDS links must specify the bssid of the far end.
  424                  * For legacy operation this is a static relationship.
  425                  * For non-legacy operation the station must associate
  426                  * and be authorized to pass traffic.  Plumbing the
  427                  * vap to the proper node happens when the vap
  428                  * transitions to RUN state.
  429                  */
  430                 IEEE80211_ADDR_COPY(vap->iv_des_bssid, bssid);
  431                 vap->iv_flags |= IEEE80211_F_DESBSSID;
  432                 if (flags & IEEE80211_CLONE_WDSLEGACY)
  433                         vap->iv_flags_ext |= IEEE80211_FEXT_WDSLEGACY;
  434                 break;
  435 #ifdef IEEE80211_SUPPORT_TDMA
  436         case IEEE80211_M_AHDEMO:
  437                 if (flags & IEEE80211_CLONE_TDMA) {
  438                         /* NB: checked before clone operation allowed */
  439                         KASSERT(ic->ic_caps & IEEE80211_C_TDMA,
  440                             ("not TDMA capable, ic_caps 0x%x", ic->ic_caps));
  441                         /*
  442                          * Propagate TDMA capability to mark vap; this
  443                          * cannot be removed and is used to distinguish
  444                          * regular ahdemo operation from ahdemo+tdma.
  445                          */
  446                         vap->iv_caps |= IEEE80211_C_TDMA;
  447                 }
  448                 break;
  449 #endif
  450         default:
  451                 break;
  452         }
  453         /* auto-enable s/w beacon miss support */
  454         if (flags & IEEE80211_CLONE_NOBEACONS)
  455                 vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
  456         /* auto-generated or user supplied MAC address */
  457         if (flags & (IEEE80211_CLONE_BSSID|IEEE80211_CLONE_MACADDR))
  458                 vap->iv_flags_ext |= IEEE80211_FEXT_UNIQMAC;
  459         /*
  460          * Enable various functionality by default if we're
  461          * capable; the driver can override us if it knows better.
  462          */
  463         if (vap->iv_caps & IEEE80211_C_WME)
  464                 vap->iv_flags |= IEEE80211_F_WME;
  465         if (vap->iv_caps & IEEE80211_C_BURST)
  466                 vap->iv_flags |= IEEE80211_F_BURST;
  467         /* NB: bg scanning only makes sense for station mode right now */
  468         if (vap->iv_opmode == IEEE80211_M_STA &&
  469             (vap->iv_caps & IEEE80211_C_BGSCAN))
  470                 vap->iv_flags |= IEEE80211_F_BGSCAN;
  471         vap->iv_flags |= IEEE80211_F_DOTH;      /* XXX no cap, just ena */
  472         /* NB: DFS support only makes sense for ap mode right now */
  473         if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
  474             (vap->iv_caps & IEEE80211_C_DFS))
  475                 vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
  476 
  477         vap->iv_des_chan = IEEE80211_CHAN_ANYC;         /* any channel is ok */
  478         vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
  479         vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
  480         /*
  481          * Install a default reset method for the ioctl support;
  482          * the driver can override this.
  483          */
  484         vap->iv_reset = default_reset;
  485 
  486         IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);
  487 
  488         ieee80211_sysctl_vattach(vap);
  489         ieee80211_crypto_vattach(vap);
  490         ieee80211_node_vattach(vap);
  491         ieee80211_power_vattach(vap);
  492         ieee80211_proto_vattach(vap);
  493 #ifdef IEEE80211_SUPPORT_SUPERG
  494         ieee80211_superg_vattach(vap);
  495 #endif
  496         ieee80211_ht_vattach(vap);
  497         ieee80211_scan_vattach(vap);
  498         ieee80211_regdomain_vattach(vap);
  499         ieee80211_radiotap_vattach(vap);
  500         ieee80211_ratectl_set(vap, IEEE80211_RATECTL_NONE);
  501 
  502         return 0;
  503 }
  504 
  505 /*
  506  * Activate a vap.  State should have been prepared with a
  507  * call to ieee80211_vap_setup and by the driver.  On return
  508  * from this call the vap is ready for use.
  509  */
  510 int
  511 ieee80211_vap_attach(struct ieee80211vap *vap,
  512         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  513 {
  514         struct ifnet *ifp = vap->iv_ifp;
  515         struct ieee80211com *ic = vap->iv_ic;
  516         struct ifmediareq imr;
  517         int maxrate;
  518 
  519         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  520             "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
  521             __func__, ieee80211_opmode_name[vap->iv_opmode],
  522             ic->ic_ifp->if_xname, vap->iv_flags, vap->iv_flags_ext);
  523 
  524         /*
  525          * Do late attach work that cannot happen until after
  526          * the driver has had a chance to override defaults.
  527          */
  528         ieee80211_node_latevattach(vap);
  529         ieee80211_power_latevattach(vap);
  530 
  531         maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
  532             vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
  533         ieee80211_media_status(ifp, &imr);
  534         /* NB: strip explicit mode; we're actually in autoselect */
  535         ifmedia_set(&vap->iv_media,
  536             imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
  537         if (maxrate)
  538                 ifp->if_baudrate = IF_Mbps(maxrate);
  539 
  540         ether_ifattach(ifp, vap->iv_myaddr);
  541         if (vap->iv_opmode == IEEE80211_M_MONITOR) {
  542                 /* NB: disallow transmit */
  543                 ifp->if_transmit = null_transmit;
  544                 ifp->if_output = null_output;
  545         } else {
  546                 /* hook output method setup by ether_ifattach */
  547                 vap->iv_output = ifp->if_output;
  548                 ifp->if_output = ieee80211_output;
  549         }
  550         /* NB: if_mtu set by ether_ifattach to ETHERMTU */
  551 
  552         IEEE80211_LOCK(ic);
  553         TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
  554         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  555 #ifdef IEEE80211_SUPPORT_SUPERG
  556         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  557 #endif
  558         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  559         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  560         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  561         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  562         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  563         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  564         IEEE80211_UNLOCK(ic);
  565 
  566         return 1;
  567 }
  568 
  569 /* 
  570  * Tear down vap state and reclaim the ifnet.
  571  * The driver is assumed to have prepared for
  572  * this; e.g. by turning off interrupts for the
  573  * underlying device.
  574  */
  575 void
  576 ieee80211_vap_detach(struct ieee80211vap *vap)
  577 {
  578         struct ieee80211com *ic = vap->iv_ic;
  579         struct ifnet *ifp = vap->iv_ifp;
  580 
  581         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
  582             __func__, ieee80211_opmode_name[vap->iv_opmode],
  583             ic->ic_ifp->if_xname);
  584 
  585         /* NB: bpfdetach is called by ether_ifdetach and claims all taps */
  586         ether_ifdetach(ifp);
  587 
  588         ieee80211_stop(vap);
  589 
  590         /*
  591          * Flush any deferred vap tasks.
  592          */
  593         ieee80211_draintask(ic, &vap->iv_nstate_task);
  594         ieee80211_draintask(ic, &vap->iv_swbmiss_task);
  595 
  596         /* XXX band-aid until ifnet handles this for us */
  597         taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
  598 
  599         IEEE80211_LOCK(ic);
  600         KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
  601         TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
  602         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  603 #ifdef IEEE80211_SUPPORT_SUPERG
  604         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  605 #endif
  606         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  607         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  608         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  609         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  610         /* NB: this handles the bpfdetach done below */
  611         ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
  612         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  613         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  614         IEEE80211_UNLOCK(ic);
  615 
  616         ifmedia_removeall(&vap->iv_media);
  617 
  618         ieee80211_radiotap_vdetach(vap);
  619         ieee80211_regdomain_vdetach(vap);
  620         ieee80211_scan_vdetach(vap);
  621 #ifdef IEEE80211_SUPPORT_SUPERG
  622         ieee80211_superg_vdetach(vap);
  623 #endif
  624         ieee80211_ht_vdetach(vap);
  625         /* NB: must be before ieee80211_node_vdetach */
  626         ieee80211_proto_vdetach(vap);
  627         ieee80211_crypto_vdetach(vap);
  628         ieee80211_power_vdetach(vap);
  629         ieee80211_node_vdetach(vap);
  630         ieee80211_sysctl_vdetach(vap);
  631 
  632         if_free(ifp);
  633 }
  634 
  635 /*
  636  * Synchronize flag bit state in the parent ifnet structure
  637  * according to the state of all vap ifnet's.  This is used,
  638  * for example, to handle IFF_PROMISC and IFF_ALLMULTI.
  639  */
  640 void
  641 ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
  642 {
  643         struct ifnet *ifp = ic->ic_ifp;
  644         struct ieee80211vap *vap;
  645         int bit, oflags;
  646 
  647         IEEE80211_LOCK_ASSERT(ic);
  648 
  649         bit = 0;
  650         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  651                 if (vap->iv_ifp->if_flags & flag) {
  652                         /*
  653                          * XXX the bridge sets PROMISC but we don't want to
  654                          * enable it on the device, discard here so all the
  655                          * drivers don't need to special-case it
  656                          */
  657                         if (flag == IFF_PROMISC &&
  658                             !(vap->iv_opmode == IEEE80211_M_MONITOR ||
  659                               (vap->iv_opmode == IEEE80211_M_AHDEMO &&
  660                                (vap->iv_caps & IEEE80211_C_TDMA) == 0)))
  661                                 continue;
  662                         bit = 1;
  663                         break;
  664                 }
  665         oflags = ifp->if_flags;
  666         if (bit)
  667                 ifp->if_flags |= flag;
  668         else
  669                 ifp->if_flags &= ~flag;
  670         if ((ifp->if_flags ^ oflags) & flag) {
  671                 /* XXX should we return 1/0 and let caller do this? */
  672                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  673                         if (flag == IFF_PROMISC)
  674                                 ieee80211_runtask(ic, &ic->ic_promisc_task);
  675                         else if (flag == IFF_ALLMULTI)
  676                                 ieee80211_runtask(ic, &ic->ic_mcast_task);
  677                 }
  678         }
  679 }
  680 
  681 /*
  682  * Synchronize flag bit state in the com structure
  683  * according to the state of all vap's.  This is used,
  684  * for example, to handle state changes via ioctls.
  685  */
  686 static void
  687 ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
  688 {
  689         struct ieee80211vap *vap;
  690         int bit;
  691 
  692         IEEE80211_LOCK_ASSERT(ic);
  693 
  694         bit = 0;
  695         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  696                 if (vap->iv_flags & flag) {
  697                         bit = 1;
  698                         break;
  699                 }
  700         if (bit)
  701                 ic->ic_flags |= flag;
  702         else
  703                 ic->ic_flags &= ~flag;
  704 }
  705 
  706 void
  707 ieee80211_syncflag(struct ieee80211vap *vap, int flag)
  708 {
  709         struct ieee80211com *ic = vap->iv_ic;
  710 
  711         IEEE80211_LOCK(ic);
  712         if (flag < 0) {
  713                 flag = -flag;
  714                 vap->iv_flags &= ~flag;
  715         } else
  716                 vap->iv_flags |= flag;
  717         ieee80211_syncflag_locked(ic, flag);
  718         IEEE80211_UNLOCK(ic);
  719 }
  720 
  721 /*
  722  * Synchronize flags_ht bit state in the com structure
  723  * according to the state of all vap's.  This is used,
  724  * for example, to handle state changes via ioctls.
  725  */
  726 static void
  727 ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
  728 {
  729         struct ieee80211vap *vap;
  730         int bit;
  731 
  732         IEEE80211_LOCK_ASSERT(ic);
  733 
  734         bit = 0;
  735         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  736                 if (vap->iv_flags_ht & flag) {
  737                         bit = 1;
  738                         break;
  739                 }
  740         if (bit)
  741                 ic->ic_flags_ht |= flag;
  742         else
  743                 ic->ic_flags_ht &= ~flag;
  744 }
  745 
  746 void
  747 ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
  748 {
  749         struct ieee80211com *ic = vap->iv_ic;
  750 
  751         IEEE80211_LOCK(ic);
  752         if (flag < 0) {
  753                 flag = -flag;
  754                 vap->iv_flags_ht &= ~flag;
  755         } else
  756                 vap->iv_flags_ht |= flag;
  757         ieee80211_syncflag_ht_locked(ic, flag);
  758         IEEE80211_UNLOCK(ic);
  759 }
  760 
  761 /*
  762  * Synchronize flags_ext bit state in the com structure
  763  * according to the state of all vap's.  This is used,
  764  * for example, to handle state changes via ioctls.
  765  */
  766 static void
  767 ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
  768 {
  769         struct ieee80211vap *vap;
  770         int bit;
  771 
  772         IEEE80211_LOCK_ASSERT(ic);
  773 
  774         bit = 0;
  775         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  776                 if (vap->iv_flags_ext & flag) {
  777                         bit = 1;
  778                         break;
  779                 }
  780         if (bit)
  781                 ic->ic_flags_ext |= flag;
  782         else
  783                 ic->ic_flags_ext &= ~flag;
  784 }
  785 
  786 void
  787 ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
  788 {
  789         struct ieee80211com *ic = vap->iv_ic;
  790 
  791         IEEE80211_LOCK(ic);
  792         if (flag < 0) {
  793                 flag = -flag;
  794                 vap->iv_flags_ext &= ~flag;
  795         } else
  796                 vap->iv_flags_ext |= flag;
  797         ieee80211_syncflag_ext_locked(ic, flag);
  798         IEEE80211_UNLOCK(ic);
  799 }
  800 
  801 static __inline int
  802 mapgsm(u_int freq, u_int flags)
  803 {
  804         freq *= 10;
  805         if (flags & IEEE80211_CHAN_QUARTER)
  806                 freq += 5;
  807         else if (flags & IEEE80211_CHAN_HALF)
  808                 freq += 10;
  809         else
  810                 freq += 20;
  811         /* NB: there is no 907/20 wide but leave room */
  812         return (freq - 906*10) / 5;
  813 }
  814 
  815 static __inline int
  816 mappsb(u_int freq, u_int flags)
  817 {
  818         return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
  819 }
  820 
  821 /*
  822  * Convert MHz frequency to IEEE channel number.
  823  */
  824 int
  825 ieee80211_mhz2ieee(u_int freq, u_int flags)
  826 {
  827 #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
  828         if (flags & IEEE80211_CHAN_GSM)
  829                 return mapgsm(freq, flags);
  830         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  831                 if (freq == 2484)
  832                         return 14;
  833                 if (freq < 2484)
  834                         return ((int) freq - 2407) / 5;
  835                 else
  836                         return 15 + ((freq - 2512) / 20);
  837         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  838                 if (freq <= 5000) {
  839                         /* XXX check regdomain? */
  840                         if (IS_FREQ_IN_PSB(freq))
  841                                 return mappsb(freq, flags);
  842                         return (freq - 4000) / 5;
  843                 } else
  844                         return (freq - 5000) / 5;
  845         } else {                                /* either, guess */
  846                 if (freq == 2484)
  847                         return 14;
  848                 if (freq < 2484) {
  849                         if (907 <= freq && freq <= 922)
  850                                 return mapgsm(freq, flags);
  851                         return ((int) freq - 2407) / 5;
  852                 }
  853                 if (freq < 5000) {
  854                         if (IS_FREQ_IN_PSB(freq))
  855                                 return mappsb(freq, flags);
  856                         else if (freq > 4900)
  857                                 return (freq - 4000) / 5;
  858                         else
  859                                 return 15 + ((freq - 2512) / 20);
  860                 }
  861                 return (freq - 5000) / 5;
  862         }
  863 #undef IS_FREQ_IN_PSB
  864 }
  865 
  866 /*
  867  * Convert channel to IEEE channel number.
  868  */
  869 int
  870 ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
  871 {
  872         if (c == NULL) {
  873                 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
  874                 return 0;               /* XXX */
  875         }
  876         return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
  877 }
  878 
  879 /*
  880  * Convert IEEE channel number to MHz frequency.
  881  */
  882 u_int
  883 ieee80211_ieee2mhz(u_int chan, u_int flags)
  884 {
  885         if (flags & IEEE80211_CHAN_GSM)
  886                 return 907 + 5 * (chan / 10);
  887         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  888                 if (chan == 14)
  889                         return 2484;
  890                 if (chan < 14)
  891                         return 2407 + chan*5;
  892                 else
  893                         return 2512 + ((chan-15)*20);
  894         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  895                 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
  896                         chan -= 37;
  897                         return 4940 + chan*5 + (chan % 5 ? 2 : 0);
  898                 }
  899                 return 5000 + (chan*5);
  900         } else {                                /* either, guess */
  901                 /* XXX can't distinguish PSB+GSM channels */
  902                 if (chan == 14)
  903                         return 2484;
  904                 if (chan < 14)                  /* 0-13 */
  905                         return 2407 + chan*5;
  906                 if (chan < 27)                  /* 15-26 */
  907                         return 2512 + ((chan-15)*20);
  908                 return 5000 + (chan*5);
  909         }
  910 }
  911 
  912 /*
  913  * Locate a channel given a frequency+flags.  We cache
  914  * the previous lookup to optimize switching between two
  915  * channels--as happens with dynamic turbo.
  916  */
  917 struct ieee80211_channel *
  918 ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
  919 {
  920         struct ieee80211_channel *c;
  921         int i;
  922 
  923         flags &= IEEE80211_CHAN_ALLTURBO;
  924         c = ic->ic_prevchan;
  925         if (c != NULL && c->ic_freq == freq &&
  926             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  927                 return c;
  928         /* brute force search */
  929         for (i = 0; i < ic->ic_nchans; i++) {
  930                 c = &ic->ic_channels[i];
  931                 if (c->ic_freq == freq &&
  932                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  933                         return c;
  934         }
  935         return NULL;
  936 }
  937 
  938 /*
  939  * Locate a channel given a channel number+flags.  We cache
  940  * the previous lookup to optimize switching between two
  941  * channels--as happens with dynamic turbo.
  942  */
  943 struct ieee80211_channel *
  944 ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
  945 {
  946         struct ieee80211_channel *c;
  947         int i;
  948 
  949         flags &= IEEE80211_CHAN_ALLTURBO;
  950         c = ic->ic_prevchan;
  951         if (c != NULL && c->ic_ieee == ieee &&
  952             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  953                 return c;
  954         /* brute force search */
  955         for (i = 0; i < ic->ic_nchans; i++) {
  956                 c = &ic->ic_channels[i];
  957                 if (c->ic_ieee == ieee &&
  958                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  959                         return c;
  960         }
  961         return NULL;
  962 }
  963 
  964 static void
  965 addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
  966 {
  967 #define ADD(_ic, _s, _o) \
  968         ifmedia_add(media, \
  969                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
  970         static const u_int mopts[IEEE80211_MODE_MAX] = { 
  971             [IEEE80211_MODE_AUTO]       = IFM_AUTO,
  972             [IEEE80211_MODE_11A]        = IFM_IEEE80211_11A,
  973             [IEEE80211_MODE_11B]        = IFM_IEEE80211_11B,
  974             [IEEE80211_MODE_11G]        = IFM_IEEE80211_11G,
  975             [IEEE80211_MODE_FH]         = IFM_IEEE80211_FH,
  976             [IEEE80211_MODE_TURBO_A]    = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  977             [IEEE80211_MODE_TURBO_G]    = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
  978             [IEEE80211_MODE_STURBO_A]   = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  979             [IEEE80211_MODE_HALF]       = IFM_IEEE80211_11A,    /* XXX */
  980             [IEEE80211_MODE_QUARTER]    = IFM_IEEE80211_11A,    /* XXX */
  981             [IEEE80211_MODE_11NA]       = IFM_IEEE80211_11NA,
  982             [IEEE80211_MODE_11NG]       = IFM_IEEE80211_11NG,
  983         };
  984         u_int mopt;
  985 
  986         mopt = mopts[mode];
  987         if (addsta)
  988                 ADD(ic, mword, mopt);   /* STA mode has no cap */
  989         if (caps & IEEE80211_C_IBSS)
  990                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
  991         if (caps & IEEE80211_C_HOSTAP)
  992                 ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
  993         if (caps & IEEE80211_C_AHDEMO)
  994                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  995         if (caps & IEEE80211_C_MONITOR)
  996                 ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
  997         if (caps & IEEE80211_C_WDS)
  998                 ADD(media, mword, mopt | IFM_IEEE80211_WDS);
  999         if (caps & IEEE80211_C_MBSS)
 1000                 ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
 1001 #undef ADD
 1002 }
 1003 
 1004 /*
 1005  * Setup the media data structures according to the channel and
 1006  * rate tables.
 1007  */
 1008 static int
 1009 ieee80211_media_setup(struct ieee80211com *ic,
 1010         struct ifmedia *media, int caps, int addsta,
 1011         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
 1012 {
 1013         int i, j, rate, maxrate, mword, r;
 1014         enum ieee80211_phymode mode;
 1015         const struct ieee80211_rateset *rs;
 1016         struct ieee80211_rateset allrates;
 1017 
 1018         /*
 1019          * Fill in media characteristics.
 1020          */
 1021         ifmedia_init(media, 0, media_change, media_stat);
 1022         maxrate = 0;
 1023         /*
 1024          * Add media for legacy operating modes.
 1025          */
 1026         memset(&allrates, 0, sizeof(allrates));
 1027         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
 1028                 if (isclr(ic->ic_modecaps, mode))
 1029                         continue;
 1030                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1031                 if (mode == IEEE80211_MODE_AUTO)
 1032                         continue;
 1033                 rs = &ic->ic_sup_rates[mode];
 1034                 for (i = 0; i < rs->rs_nrates; i++) {
 1035                         rate = rs->rs_rates[i];
 1036                         mword = ieee80211_rate2media(ic, rate, mode);
 1037                         if (mword == 0)
 1038                                 continue;
 1039                         addmedia(media, caps, addsta, mode, mword);
 1040                         /*
 1041                          * Add legacy rate to the collection of all rates.
 1042                          */
 1043                         r = rate & IEEE80211_RATE_VAL;
 1044                         for (j = 0; j < allrates.rs_nrates; j++)
 1045                                 if (allrates.rs_rates[j] == r)
 1046                                         break;
 1047                         if (j == allrates.rs_nrates) {
 1048                                 /* unique, add to the set */
 1049                                 allrates.rs_rates[j] = r;
 1050                                 allrates.rs_nrates++;
 1051                         }
 1052                         rate = (rate & IEEE80211_RATE_VAL) / 2;
 1053                         if (rate > maxrate)
 1054                                 maxrate = rate;
 1055                 }
 1056         }
 1057         for (i = 0; i < allrates.rs_nrates; i++) {
 1058                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
 1059                                 IEEE80211_MODE_AUTO);
 1060                 if (mword == 0)
 1061                         continue;
 1062                 /* NB: remove media options from mword */
 1063                 addmedia(media, caps, addsta,
 1064                     IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
 1065         }
 1066         /*
 1067          * Add HT/11n media.  Note that we do not have enough
 1068          * bits in the media subtype to express the MCS so we
 1069          * use a "placeholder" media subtype and any fixed MCS
 1070          * must be specified with a different mechanism.
 1071          */
 1072         for (; mode <= IEEE80211_MODE_11NG; mode++) {
 1073                 if (isclr(ic->ic_modecaps, mode))
 1074                         continue;
 1075                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1076                 addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
 1077         }
 1078         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
 1079             isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
 1080                 addmedia(media, caps, addsta,
 1081                     IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
 1082                 i = ic->ic_txstream * 8 - 1;
 1083                 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
 1084                     (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40))
 1085                         rate = ieee80211_htrates[i].ht40_rate_400ns;
 1086                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40))
 1087                         rate = ieee80211_htrates[i].ht40_rate_800ns;
 1088                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20))
 1089                         rate = ieee80211_htrates[i].ht20_rate_400ns;
 1090                 else
 1091                         rate = ieee80211_htrates[i].ht20_rate_800ns;
 1092                 if (rate > maxrate)
 1093                         maxrate = rate;
 1094         }
 1095         return maxrate;
 1096 }
 1097 
 1098 void
 1099 ieee80211_media_init(struct ieee80211com *ic)
 1100 {
 1101         struct ifnet *ifp = ic->ic_ifp;
 1102         int maxrate;
 1103 
 1104         /* NB: this works because the structure is initialized to zero */
 1105         if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
 1106                 /*
 1107                  * We are re-initializing the channel list; clear
 1108                  * the existing media state as the media routines
 1109                  * don't suppress duplicates.
 1110                  */
 1111                 ifmedia_removeall(&ic->ic_media);
 1112         }
 1113         ieee80211_chan_init(ic);
 1114 
 1115         /*
 1116          * Recalculate media settings in case new channel list changes
 1117          * the set of available modes.
 1118          */
 1119         maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
 1120                 ieee80211com_media_change, ieee80211com_media_status);
 1121         /* NB: strip explicit mode; we're actually in autoselect */
 1122         ifmedia_set(&ic->ic_media,
 1123             media_status(ic->ic_opmode, ic->ic_curchan) &~
 1124                 (IFM_MMASK | IFM_IEEE80211_TURBO));
 1125         if (maxrate)
 1126                 ifp->if_baudrate = IF_Mbps(maxrate);
 1127 
 1128         /* XXX need to propagate new media settings to vap's */
 1129 }
 1130 
 1131 /* XXX inline or eliminate? */
 1132 const struct ieee80211_rateset *
 1133 ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
 1134 {
 1135         /* XXX does this work for 11ng basic rates? */
 1136         return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
 1137 }
 1138 
 1139 void
 1140 ieee80211_announce(struct ieee80211com *ic)
 1141 {
 1142         struct ifnet *ifp = ic->ic_ifp;
 1143         int i, rate, mword;
 1144         enum ieee80211_phymode mode;
 1145         const struct ieee80211_rateset *rs;
 1146 
 1147         /* NB: skip AUTO since it has no rates */
 1148         for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
 1149                 if (isclr(ic->ic_modecaps, mode))
 1150                         continue;
 1151                 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
 1152                 rs = &ic->ic_sup_rates[mode];
 1153                 for (i = 0; i < rs->rs_nrates; i++) {
 1154                         mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
 1155                         if (mword == 0)
 1156                                 continue;
 1157                         rate = ieee80211_media2rate(mword);
 1158                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
 1159                             rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
 1160                 }
 1161                 printf("\n");
 1162         }
 1163         ieee80211_ht_announce(ic);
 1164 }
 1165 
 1166 void
 1167 ieee80211_announce_channels(struct ieee80211com *ic)
 1168 {
 1169         const struct ieee80211_channel *c;
 1170         char type;
 1171         int i, cw;
 1172 
 1173         printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
 1174         for (i = 0; i < ic->ic_nchans; i++) {
 1175                 c = &ic->ic_channels[i];
 1176                 if (IEEE80211_IS_CHAN_ST(c))
 1177                         type = 'S';
 1178                 else if (IEEE80211_IS_CHAN_108A(c))
 1179                         type = 'T';
 1180                 else if (IEEE80211_IS_CHAN_108G(c))
 1181                         type = 'G';
 1182                 else if (IEEE80211_IS_CHAN_HT(c))
 1183                         type = 'n';
 1184                 else if (IEEE80211_IS_CHAN_A(c))
 1185                         type = 'a';
 1186                 else if (IEEE80211_IS_CHAN_ANYG(c))
 1187                         type = 'g';
 1188                 else if (IEEE80211_IS_CHAN_B(c))
 1189                         type = 'b';
 1190                 else
 1191                         type = 'f';
 1192                 if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
 1193                         cw = 40;
 1194                 else if (IEEE80211_IS_CHAN_HALF(c))
 1195                         cw = 10;
 1196                 else if (IEEE80211_IS_CHAN_QUARTER(c))
 1197                         cw = 5;
 1198                 else
 1199                         cw = 20;
 1200                 printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
 1201                         , c->ic_ieee, c->ic_freq, type
 1202                         , cw
 1203                         , IEEE80211_IS_CHAN_HT40U(c) ? '+' :
 1204                           IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
 1205                         , c->ic_maxregpower
 1206                         , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
 1207                         , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
 1208                 );
 1209         }
 1210 }
 1211 
 1212 static int
 1213 media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
 1214 {
 1215         switch (IFM_MODE(ime->ifm_media)) {
 1216         case IFM_IEEE80211_11A:
 1217                 *mode = IEEE80211_MODE_11A;
 1218                 break;
 1219         case IFM_IEEE80211_11B:
 1220                 *mode = IEEE80211_MODE_11B;
 1221                 break;
 1222         case IFM_IEEE80211_11G:
 1223                 *mode = IEEE80211_MODE_11G;
 1224                 break;
 1225         case IFM_IEEE80211_FH:
 1226                 *mode = IEEE80211_MODE_FH;
 1227                 break;
 1228         case IFM_IEEE80211_11NA:
 1229                 *mode = IEEE80211_MODE_11NA;
 1230                 break;
 1231         case IFM_IEEE80211_11NG:
 1232                 *mode = IEEE80211_MODE_11NG;
 1233                 break;
 1234         case IFM_AUTO:
 1235                 *mode = IEEE80211_MODE_AUTO;
 1236                 break;
 1237         default:
 1238                 return 0;
 1239         }
 1240         /*
 1241          * Turbo mode is an ``option''.
 1242          * XXX does not apply to AUTO
 1243          */
 1244         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
 1245                 if (*mode == IEEE80211_MODE_11A) {
 1246                         if (flags & IEEE80211_F_TURBOP)
 1247                                 *mode = IEEE80211_MODE_TURBO_A;
 1248                         else
 1249                                 *mode = IEEE80211_MODE_STURBO_A;
 1250                 } else if (*mode == IEEE80211_MODE_11G)
 1251                         *mode = IEEE80211_MODE_TURBO_G;
 1252                 else
 1253                         return 0;
 1254         }
 1255         /* XXX HT40 +/- */
 1256         return 1;
 1257 }
 1258 
 1259 /*
 1260  * Handle a media change request on the underlying interface.
 1261  */
 1262 int
 1263 ieee80211com_media_change(struct ifnet *ifp)
 1264 {
 1265         return EINVAL;
 1266 }
 1267 
 1268 /*
 1269  * Handle a media change request on the vap interface.
 1270  */
 1271 int
 1272 ieee80211_media_change(struct ifnet *ifp)
 1273 {
 1274         struct ieee80211vap *vap = ifp->if_softc;
 1275         struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
 1276         uint16_t newmode;
 1277 
 1278         if (!media2mode(ime, vap->iv_flags, &newmode))
 1279                 return EINVAL;
 1280         if (vap->iv_des_mode != newmode) {
 1281                 vap->iv_des_mode = newmode;
 1282                 /* XXX kick state machine if up+running */
 1283         }
 1284         return 0;
 1285 }
 1286 
 1287 /*
 1288  * Common code to calculate the media status word
 1289  * from the operating mode and channel state.
 1290  */
 1291 static int
 1292 media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
 1293 {
 1294         int status;
 1295 
 1296         status = IFM_IEEE80211;
 1297         switch (opmode) {
 1298         case IEEE80211_M_STA:
 1299                 break;
 1300         case IEEE80211_M_IBSS:
 1301                 status |= IFM_IEEE80211_ADHOC;
 1302                 break;
 1303         case IEEE80211_M_HOSTAP:
 1304                 status |= IFM_IEEE80211_HOSTAP;
 1305                 break;
 1306         case IEEE80211_M_MONITOR:
 1307                 status |= IFM_IEEE80211_MONITOR;
 1308                 break;
 1309         case IEEE80211_M_AHDEMO:
 1310                 status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
 1311                 break;
 1312         case IEEE80211_M_WDS:
 1313                 status |= IFM_IEEE80211_WDS;
 1314                 break;
 1315         case IEEE80211_M_MBSS:
 1316                 status |= IFM_IEEE80211_MBSS;
 1317                 break;
 1318         }
 1319         if (IEEE80211_IS_CHAN_HTA(chan)) {
 1320                 status |= IFM_IEEE80211_11NA;
 1321         } else if (IEEE80211_IS_CHAN_HTG(chan)) {
 1322                 status |= IFM_IEEE80211_11NG;
 1323         } else if (IEEE80211_IS_CHAN_A(chan)) {
 1324                 status |= IFM_IEEE80211_11A;
 1325         } else if (IEEE80211_IS_CHAN_B(chan)) {
 1326                 status |= IFM_IEEE80211_11B;
 1327         } else if (IEEE80211_IS_CHAN_ANYG(chan)) {
 1328                 status |= IFM_IEEE80211_11G;
 1329         } else if (IEEE80211_IS_CHAN_FHSS(chan)) {
 1330                 status |= IFM_IEEE80211_FH;
 1331         }
 1332         /* XXX else complain? */
 1333 
 1334         if (IEEE80211_IS_CHAN_TURBO(chan))
 1335                 status |= IFM_IEEE80211_TURBO;
 1336 #if 0
 1337         if (IEEE80211_IS_CHAN_HT20(chan))
 1338                 status |= IFM_IEEE80211_HT20;
 1339         if (IEEE80211_IS_CHAN_HT40(chan))
 1340                 status |= IFM_IEEE80211_HT40;
 1341 #endif
 1342         return status;
 1343 }
 1344 
 1345 static void
 1346 ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1347 {
 1348         struct ieee80211com *ic = ifp->if_l2com;
 1349         struct ieee80211vap *vap;
 1350 
 1351         imr->ifm_status = IFM_AVALID;
 1352         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 1353                 if (vap->iv_ifp->if_flags & IFF_UP) {
 1354                         imr->ifm_status |= IFM_ACTIVE;
 1355                         break;
 1356                 }
 1357         imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
 1358         if (imr->ifm_status & IFM_ACTIVE)
 1359                 imr->ifm_current = imr->ifm_active;
 1360 }
 1361 
 1362 void
 1363 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1364 {
 1365         struct ieee80211vap *vap = ifp->if_softc;
 1366         struct ieee80211com *ic = vap->iv_ic;
 1367         enum ieee80211_phymode mode;
 1368 
 1369         imr->ifm_status = IFM_AVALID;
 1370         /*
 1371          * NB: use the current channel's mode to lock down a xmit
 1372          * rate only when running; otherwise we may have a mismatch
 1373          * in which case the rate will not be convertible.
 1374          */
 1375         if (vap->iv_state == IEEE80211_S_RUN) {
 1376                 imr->ifm_status |= IFM_ACTIVE;
 1377                 mode = ieee80211_chan2mode(ic->ic_curchan);
 1378         } else
 1379                 mode = IEEE80211_MODE_AUTO;
 1380         imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
 1381         /*
 1382          * Calculate a current rate if possible.
 1383          */
 1384         if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
 1385                 /*
 1386                  * A fixed rate is set, report that.
 1387                  */
 1388                 imr->ifm_active |= ieee80211_rate2media(ic,
 1389                         vap->iv_txparms[mode].ucastrate, mode);
 1390         } else if (vap->iv_opmode == IEEE80211_M_STA) {
 1391                 /*
 1392                  * In station mode report the current transmit rate.
 1393                  */
 1394                 imr->ifm_active |= ieee80211_rate2media(ic,
 1395                         vap->iv_bss->ni_txrate, mode);
 1396         } else
 1397                 imr->ifm_active |= IFM_AUTO;
 1398         if (imr->ifm_status & IFM_ACTIVE)
 1399                 imr->ifm_current = imr->ifm_active;
 1400 }
 1401 
 1402 /*
 1403  * Set the current phy mode and recalculate the active channel
 1404  * set based on the available channels for this mode.  Also
 1405  * select a new default/current channel if the current one is
 1406  * inappropriate for this mode.
 1407  */
 1408 int
 1409 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
 1410 {
 1411         /*
 1412          * Adjust basic rates in 11b/11g supported rate set.
 1413          * Note that if operating on a hal/quarter rate channel
 1414          * this is a noop as those rates sets are different
 1415          * and used instead.
 1416          */
 1417         if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
 1418                 ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
 1419 
 1420         ic->ic_curmode = mode;
 1421         ieee80211_reset_erp(ic);        /* reset ERP state */
 1422 
 1423         return 0;
 1424 }
 1425 
 1426 /*
 1427  * Return the phy mode for with the specified channel.
 1428  */
 1429 enum ieee80211_phymode
 1430 ieee80211_chan2mode(const struct ieee80211_channel *chan)
 1431 {
 1432 
 1433         if (IEEE80211_IS_CHAN_HTA(chan))
 1434                 return IEEE80211_MODE_11NA;
 1435         else if (IEEE80211_IS_CHAN_HTG(chan))
 1436                 return IEEE80211_MODE_11NG;
 1437         else if (IEEE80211_IS_CHAN_108G(chan))
 1438                 return IEEE80211_MODE_TURBO_G;
 1439         else if (IEEE80211_IS_CHAN_ST(chan))
 1440                 return IEEE80211_MODE_STURBO_A;
 1441         else if (IEEE80211_IS_CHAN_TURBO(chan))
 1442                 return IEEE80211_MODE_TURBO_A;
 1443         else if (IEEE80211_IS_CHAN_HALF(chan))
 1444                 return IEEE80211_MODE_HALF;
 1445         else if (IEEE80211_IS_CHAN_QUARTER(chan))
 1446                 return IEEE80211_MODE_QUARTER;
 1447         else if (IEEE80211_IS_CHAN_A(chan))
 1448                 return IEEE80211_MODE_11A;
 1449         else if (IEEE80211_IS_CHAN_ANYG(chan))
 1450                 return IEEE80211_MODE_11G;
 1451         else if (IEEE80211_IS_CHAN_B(chan))
 1452                 return IEEE80211_MODE_11B;
 1453         else if (IEEE80211_IS_CHAN_FHSS(chan))
 1454                 return IEEE80211_MODE_FH;
 1455 
 1456         /* NB: should not get here */
 1457         printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
 1458                 __func__, chan->ic_freq, chan->ic_flags);
 1459         return IEEE80211_MODE_11B;
 1460 }
 1461 
 1462 struct ratemedia {
 1463         u_int   match;  /* rate + mode */
 1464         u_int   media;  /* if_media rate */
 1465 };
 1466 
 1467 static int
 1468 findmedia(const struct ratemedia rates[], int n, u_int match)
 1469 {
 1470         int i;
 1471 
 1472         for (i = 0; i < n; i++)
 1473                 if (rates[i].match == match)
 1474                         return rates[i].media;
 1475         return IFM_AUTO;
 1476 }
 1477 
 1478 /*
 1479  * Convert IEEE80211 rate value to ifmedia subtype.
 1480  * Rate is either a legacy rate in units of 0.5Mbps
 1481  * or an MCS index.
 1482  */
 1483 int
 1484 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
 1485 {
 1486 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1487         static const struct ratemedia rates[] = {
 1488                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
 1489                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
 1490                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
 1491                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
 1492                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
 1493                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
 1494                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
 1495                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
 1496                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
 1497                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
 1498                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
 1499                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
 1500                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
 1501                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
 1502                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
 1503                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
 1504                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
 1505                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
 1506                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
 1507                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
 1508                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
 1509                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
 1510                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
 1511                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
 1512                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
 1513                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
 1514                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
 1515                 {   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
 1516                 {   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
 1517                 {  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
 1518                 /* NB: OFDM72 doesn't realy exist so we don't handle it */
 1519         };
 1520         static const struct ratemedia htrates[] = {
 1521                 {   0, IFM_IEEE80211_MCS },
 1522                 {   1, IFM_IEEE80211_MCS },
 1523                 {   2, IFM_IEEE80211_MCS },
 1524                 {   3, IFM_IEEE80211_MCS },
 1525                 {   4, IFM_IEEE80211_MCS },
 1526                 {   5, IFM_IEEE80211_MCS },
 1527                 {   6, IFM_IEEE80211_MCS },
 1528                 {   7, IFM_IEEE80211_MCS },
 1529                 {   8, IFM_IEEE80211_MCS },
 1530                 {   9, IFM_IEEE80211_MCS },
 1531                 {  10, IFM_IEEE80211_MCS },
 1532                 {  11, IFM_IEEE80211_MCS },
 1533                 {  12, IFM_IEEE80211_MCS },
 1534                 {  13, IFM_IEEE80211_MCS },
 1535                 {  14, IFM_IEEE80211_MCS },
 1536                 {  15, IFM_IEEE80211_MCS },
 1537                 {  16, IFM_IEEE80211_MCS },
 1538                 {  17, IFM_IEEE80211_MCS },
 1539                 {  18, IFM_IEEE80211_MCS },
 1540                 {  19, IFM_IEEE80211_MCS },
 1541                 {  20, IFM_IEEE80211_MCS },
 1542                 {  21, IFM_IEEE80211_MCS },
 1543                 {  22, IFM_IEEE80211_MCS },
 1544                 {  23, IFM_IEEE80211_MCS },
 1545                 {  24, IFM_IEEE80211_MCS },
 1546                 {  25, IFM_IEEE80211_MCS },
 1547                 {  26, IFM_IEEE80211_MCS },
 1548                 {  27, IFM_IEEE80211_MCS },
 1549                 {  28, IFM_IEEE80211_MCS },
 1550                 {  29, IFM_IEEE80211_MCS },
 1551                 {  30, IFM_IEEE80211_MCS },
 1552                 {  31, IFM_IEEE80211_MCS },
 1553                 {  32, IFM_IEEE80211_MCS },
 1554                 {  33, IFM_IEEE80211_MCS },
 1555                 {  34, IFM_IEEE80211_MCS },
 1556                 {  35, IFM_IEEE80211_MCS },
 1557                 {  36, IFM_IEEE80211_MCS },
 1558                 {  37, IFM_IEEE80211_MCS },
 1559                 {  38, IFM_IEEE80211_MCS },
 1560                 {  39, IFM_IEEE80211_MCS },
 1561                 {  40, IFM_IEEE80211_MCS },
 1562                 {  41, IFM_IEEE80211_MCS },
 1563                 {  42, IFM_IEEE80211_MCS },
 1564                 {  43, IFM_IEEE80211_MCS },
 1565                 {  44, IFM_IEEE80211_MCS },
 1566                 {  45, IFM_IEEE80211_MCS },
 1567                 {  46, IFM_IEEE80211_MCS },
 1568                 {  47, IFM_IEEE80211_MCS },
 1569                 {  48, IFM_IEEE80211_MCS },
 1570                 {  49, IFM_IEEE80211_MCS },
 1571                 {  50, IFM_IEEE80211_MCS },
 1572                 {  51, IFM_IEEE80211_MCS },
 1573                 {  52, IFM_IEEE80211_MCS },
 1574                 {  53, IFM_IEEE80211_MCS },
 1575                 {  54, IFM_IEEE80211_MCS },
 1576                 {  55, IFM_IEEE80211_MCS },
 1577                 {  56, IFM_IEEE80211_MCS },
 1578                 {  57, IFM_IEEE80211_MCS },
 1579                 {  58, IFM_IEEE80211_MCS },
 1580                 {  59, IFM_IEEE80211_MCS },
 1581                 {  60, IFM_IEEE80211_MCS },
 1582                 {  61, IFM_IEEE80211_MCS },
 1583                 {  62, IFM_IEEE80211_MCS },
 1584                 {  63, IFM_IEEE80211_MCS },
 1585                 {  64, IFM_IEEE80211_MCS },
 1586                 {  65, IFM_IEEE80211_MCS },
 1587                 {  66, IFM_IEEE80211_MCS },
 1588                 {  67, IFM_IEEE80211_MCS },
 1589                 {  68, IFM_IEEE80211_MCS },
 1590                 {  69, IFM_IEEE80211_MCS },
 1591                 {  70, IFM_IEEE80211_MCS },
 1592                 {  71, IFM_IEEE80211_MCS },
 1593                 {  72, IFM_IEEE80211_MCS },
 1594                 {  73, IFM_IEEE80211_MCS },
 1595                 {  74, IFM_IEEE80211_MCS },
 1596                 {  75, IFM_IEEE80211_MCS },
 1597                 {  76, IFM_IEEE80211_MCS },
 1598         };
 1599         int m;
 1600 
 1601         /*
 1602          * Check 11n rates first for match as an MCS.
 1603          */
 1604         if (mode == IEEE80211_MODE_11NA) {
 1605                 if (rate & IEEE80211_RATE_MCS) {
 1606                         rate &= ~IEEE80211_RATE_MCS;
 1607                         m = findmedia(htrates, N(htrates), rate);
 1608                         if (m != IFM_AUTO)
 1609                                 return m | IFM_IEEE80211_11NA;
 1610                 }
 1611         } else if (mode == IEEE80211_MODE_11NG) {
 1612                 /* NB: 12 is ambiguous, it will be treated as an MCS */
 1613                 if (rate & IEEE80211_RATE_MCS) {
 1614                         rate &= ~IEEE80211_RATE_MCS;
 1615                         m = findmedia(htrates, N(htrates), rate);
 1616                         if (m != IFM_AUTO)
 1617                                 return m | IFM_IEEE80211_11NG;
 1618                 }
 1619         }
 1620         rate &= IEEE80211_RATE_VAL;
 1621         switch (mode) {
 1622         case IEEE80211_MODE_11A:
 1623         case IEEE80211_MODE_HALF:               /* XXX good 'nuf */
 1624         case IEEE80211_MODE_QUARTER:
 1625         case IEEE80211_MODE_11NA:
 1626         case IEEE80211_MODE_TURBO_A:
 1627         case IEEE80211_MODE_STURBO_A:
 1628                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11A);
 1629         case IEEE80211_MODE_11B:
 1630                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B);
 1631         case IEEE80211_MODE_FH:
 1632                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH);
 1633         case IEEE80211_MODE_AUTO:
 1634                 /* NB: ic may be NULL for some drivers */
 1635                 if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
 1636                         return findmedia(rates, N(rates),
 1637                             rate | IFM_IEEE80211_FH);
 1638                 /* NB: hack, 11g matches both 11b+11a rates */
 1639                 /* fall thru... */
 1640         case IEEE80211_MODE_11G:
 1641         case IEEE80211_MODE_11NG:
 1642         case IEEE80211_MODE_TURBO_G:
 1643                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11G);
 1644         }
 1645         return IFM_AUTO;
 1646 #undef N
 1647 }
 1648 
 1649 int
 1650 ieee80211_media2rate(int mword)
 1651 {
 1652 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1653         static const int ieeerates[] = {
 1654                 -1,             /* IFM_AUTO */
 1655                 0,              /* IFM_MANUAL */
 1656                 0,              /* IFM_NONE */
 1657                 2,              /* IFM_IEEE80211_FH1 */
 1658                 4,              /* IFM_IEEE80211_FH2 */
 1659                 2,              /* IFM_IEEE80211_DS1 */
 1660                 4,              /* IFM_IEEE80211_DS2 */
 1661                 11,             /* IFM_IEEE80211_DS5 */
 1662                 22,             /* IFM_IEEE80211_DS11 */
 1663                 44,             /* IFM_IEEE80211_DS22 */
 1664                 12,             /* IFM_IEEE80211_OFDM6 */
 1665                 18,             /* IFM_IEEE80211_OFDM9 */
 1666                 24,             /* IFM_IEEE80211_OFDM12 */
 1667                 36,             /* IFM_IEEE80211_OFDM18 */
 1668                 48,             /* IFM_IEEE80211_OFDM24 */
 1669                 72,             /* IFM_IEEE80211_OFDM36 */
 1670                 96,             /* IFM_IEEE80211_OFDM48 */
 1671                 108,            /* IFM_IEEE80211_OFDM54 */
 1672                 144,            /* IFM_IEEE80211_OFDM72 */
 1673                 0,              /* IFM_IEEE80211_DS354k */
 1674                 0,              /* IFM_IEEE80211_DS512k */
 1675                 6,              /* IFM_IEEE80211_OFDM3 */
 1676                 9,              /* IFM_IEEE80211_OFDM4 */
 1677                 54,             /* IFM_IEEE80211_OFDM27 */
 1678                 -1,             /* IFM_IEEE80211_MCS */
 1679         };
 1680         return IFM_SUBTYPE(mword) < N(ieeerates) ?
 1681                 ieeerates[IFM_SUBTYPE(mword)] : 0;
 1682 #undef N
 1683 }
 1684 
 1685 /*
 1686  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 1687  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 1688  */
 1689 #define mix(a, b, c)                                                    \
 1690 do {                                                                    \
 1691         a -= b; a -= c; a ^= (c >> 13);                                 \
 1692         b -= c; b -= a; b ^= (a << 8);                                  \
 1693         c -= a; c -= b; c ^= (b >> 13);                                 \
 1694         a -= b; a -= c; a ^= (c >> 12);                                 \
 1695         b -= c; b -= a; b ^= (a << 16);                                 \
 1696         c -= a; c -= b; c ^= (b >> 5);                                  \
 1697         a -= b; a -= c; a ^= (c >> 3);                                  \
 1698         b -= c; b -= a; b ^= (a << 10);                                 \
 1699         c -= a; c -= b; c ^= (b >> 15);                                 \
 1700 } while (/*CONSTCOND*/0)
 1701 
 1702 uint32_t
 1703 ieee80211_mac_hash(const struct ieee80211com *ic,
 1704         const uint8_t addr[IEEE80211_ADDR_LEN])
 1705 {
 1706         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
 1707 
 1708         b += addr[5] << 8;
 1709         b += addr[4];
 1710         a += addr[3] << 24;
 1711         a += addr[2] << 16;
 1712         a += addr[1] << 8;
 1713         a += addr[0];
 1714 
 1715         mix(a, b, c);
 1716 
 1717         return c;
 1718 }
 1719 #undef mix

Cache object: c0409b365bfbabbf93d44e2dd8db89e7


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