The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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/9.0/sys/net80211/ieee80211.c 219599 2011-03-13 11:47:43Z bschmidt $");
   29 
   30 /*
   31  * IEEE 802.11 generic handler
   32  */
   33 #include "opt_wlan.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 
   39 #include <sys/socket.h>
   40 
   41 #include <net/if.h>
   42 #include <net/if_dl.h>
   43 #include <net/if_media.h>
   44 #include <net/if_types.h>
   45 #include <net/ethernet.h>
   46 
   47 #include <net80211/ieee80211_var.h>
   48 #include <net80211/ieee80211_regdomain.h>
   49 #ifdef IEEE80211_SUPPORT_SUPERG
   50 #include <net80211/ieee80211_superg.h>
   51 #endif
   52 #include <net80211/ieee80211_ratectl.h>
   53 
   54 #include <net/bpf.h>
   55 
   56 const char *ieee80211_phymode_name[IEEE80211_MODE_MAX] = {
   57         [IEEE80211_MODE_AUTO]     = "auto",
   58         [IEEE80211_MODE_11A]      = "11a",
   59         [IEEE80211_MODE_11B]      = "11b",
   60         [IEEE80211_MODE_11G]      = "11g",
   61         [IEEE80211_MODE_FH]       = "FH",
   62         [IEEE80211_MODE_TURBO_A]  = "turboA",
   63         [IEEE80211_MODE_TURBO_G]  = "turboG",
   64         [IEEE80211_MODE_STURBO_A] = "sturboA",
   65         [IEEE80211_MODE_HALF]     = "half",
   66         [IEEE80211_MODE_QUARTER]  = "quarter",
   67         [IEEE80211_MODE_11NA]     = "11na",
   68         [IEEE80211_MODE_11NG]     = "11ng",
   69 };
   70 /* map ieee80211_opmode to the corresponding capability bit */
   71 const int ieee80211_opcap[IEEE80211_OPMODE_MAX] = {
   72         [IEEE80211_M_IBSS]      = IEEE80211_C_IBSS,
   73         [IEEE80211_M_WDS]       = IEEE80211_C_WDS,
   74         [IEEE80211_M_STA]       = IEEE80211_C_STA,
   75         [IEEE80211_M_AHDEMO]    = IEEE80211_C_AHDEMO,
   76         [IEEE80211_M_HOSTAP]    = IEEE80211_C_HOSTAP,
   77         [IEEE80211_M_MONITOR]   = IEEE80211_C_MONITOR,
   78 #ifdef IEEE80211_SUPPORT_MESH
   79         [IEEE80211_M_MBSS]      = IEEE80211_C_MBSS,
   80 #endif
   81 };
   82 
   83 static const uint8_t ieee80211broadcastaddr[IEEE80211_ADDR_LEN] =
   84         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
   85 
   86 static  void ieee80211_syncflag_locked(struct ieee80211com *ic, int flag);
   87 static  void ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag);
   88 static  void ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag);
   89 static  int ieee80211_media_setup(struct ieee80211com *ic,
   90                 struct ifmedia *media, int caps, int addsta,
   91                 ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
   92 static  void ieee80211com_media_status(struct ifnet *, struct ifmediareq *);
   93 static  int ieee80211com_media_change(struct ifnet *);
   94 static  int media_status(enum ieee80211_opmode,
   95                 const struct ieee80211_channel *);
   96 
   97 MALLOC_DEFINE(M_80211_VAP, "80211vap", "802.11 vap state");
   98 
   99 /*
  100  * Default supported rates for 802.11 operation (in IEEE .5Mb units).
  101  */
  102 #define B(r)    ((r) | IEEE80211_RATE_BASIC)
  103 static const struct ieee80211_rateset ieee80211_rateset_11a =
  104         { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } };
  105 static const struct ieee80211_rateset ieee80211_rateset_half =
  106         { 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } };
  107 static const struct ieee80211_rateset ieee80211_rateset_quarter =
  108         { 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } };
  109 static const struct ieee80211_rateset ieee80211_rateset_11b =
  110         { 4, { B(2), B(4), B(11), B(22) } };
  111 /* NB: OFDM rates are handled specially based on mode */
  112 static const struct ieee80211_rateset ieee80211_rateset_11g =
  113         { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } };
  114 #undef B
  115 
  116 /*
  117  * Fill in 802.11 available channel set, mark
  118  * all available channels as active, and pick
  119  * a default channel if not already specified.
  120  */
  121 static void
  122 ieee80211_chan_init(struct ieee80211com *ic)
  123 {
  124 #define DEFAULTRATES(m, def) do { \
  125         if (ic->ic_sup_rates[m].rs_nrates == 0) \
  126                 ic->ic_sup_rates[m] = def; \
  127 } while (0)
  128         struct ieee80211_channel *c;
  129         int i;
  130 
  131         KASSERT(0 < ic->ic_nchans && ic->ic_nchans <= IEEE80211_CHAN_MAX,
  132                 ("invalid number of channels specified: %u", ic->ic_nchans));
  133         memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
  134         memset(ic->ic_modecaps, 0, sizeof(ic->ic_modecaps));
  135         setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO);
  136         for (i = 0; i < ic->ic_nchans; i++) {
  137                 c = &ic->ic_channels[i];
  138                 KASSERT(c->ic_flags != 0, ("channel with no flags"));
  139                 /*
  140                  * Help drivers that work only with frequencies by filling
  141                  * in IEEE channel #'s if not already calculated.  Note this
  142                  * mimics similar work done in ieee80211_setregdomain when
  143                  * changing regulatory state.
  144                  */
  145                 if (c->ic_ieee == 0)
  146                         c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
  147                 if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
  148                         c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
  149                             (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
  150                             c->ic_flags);
  151                 /* default max tx power to max regulatory */
  152                 if (c->ic_maxpower == 0)
  153                         c->ic_maxpower = 2*c->ic_maxregpower;
  154                 setbit(ic->ic_chan_avail, c->ic_ieee);
  155                 /*
  156                  * Identify mode capabilities.
  157                  */
  158                 if (IEEE80211_IS_CHAN_A(c))
  159                         setbit(ic->ic_modecaps, IEEE80211_MODE_11A);
  160                 if (IEEE80211_IS_CHAN_B(c))
  161                         setbit(ic->ic_modecaps, IEEE80211_MODE_11B);
  162                 if (IEEE80211_IS_CHAN_ANYG(c))
  163                         setbit(ic->ic_modecaps, IEEE80211_MODE_11G);
  164                 if (IEEE80211_IS_CHAN_FHSS(c))
  165                         setbit(ic->ic_modecaps, IEEE80211_MODE_FH);
  166                 if (IEEE80211_IS_CHAN_108A(c))
  167                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A);
  168                 if (IEEE80211_IS_CHAN_108G(c))
  169                         setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G);
  170                 if (IEEE80211_IS_CHAN_ST(c))
  171                         setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A);
  172                 if (IEEE80211_IS_CHAN_HALF(c))
  173                         setbit(ic->ic_modecaps, IEEE80211_MODE_HALF);
  174                 if (IEEE80211_IS_CHAN_QUARTER(c))
  175                         setbit(ic->ic_modecaps, IEEE80211_MODE_QUARTER);
  176                 if (IEEE80211_IS_CHAN_HTA(c))
  177                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NA);
  178                 if (IEEE80211_IS_CHAN_HTG(c))
  179                         setbit(ic->ic_modecaps, IEEE80211_MODE_11NG);
  180         }
  181         /* initialize candidate channels to all available */
  182         memcpy(ic->ic_chan_active, ic->ic_chan_avail,
  183                 sizeof(ic->ic_chan_avail));
  184 
  185         /* sort channel table to allow lookup optimizations */
  186         ieee80211_sort_channels(ic->ic_channels, ic->ic_nchans);
  187 
  188         /* invalidate any previous state */
  189         ic->ic_bsschan = IEEE80211_CHAN_ANYC;
  190         ic->ic_prevchan = NULL;
  191         ic->ic_csa_newchan = NULL;
  192         /* arbitrarily pick the first channel */
  193         ic->ic_curchan = &ic->ic_channels[0];
  194         ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
  195 
  196         /* fillin well-known rate sets if driver has not specified */
  197         DEFAULTRATES(IEEE80211_MODE_11B,         ieee80211_rateset_11b);
  198         DEFAULTRATES(IEEE80211_MODE_11G,         ieee80211_rateset_11g);
  199         DEFAULTRATES(IEEE80211_MODE_11A,         ieee80211_rateset_11a);
  200         DEFAULTRATES(IEEE80211_MODE_TURBO_A,     ieee80211_rateset_11a);
  201         DEFAULTRATES(IEEE80211_MODE_TURBO_G,     ieee80211_rateset_11g);
  202         DEFAULTRATES(IEEE80211_MODE_STURBO_A,    ieee80211_rateset_11a);
  203         DEFAULTRATES(IEEE80211_MODE_HALF,        ieee80211_rateset_half);
  204         DEFAULTRATES(IEEE80211_MODE_QUARTER,     ieee80211_rateset_quarter);
  205         DEFAULTRATES(IEEE80211_MODE_11NA,        ieee80211_rateset_11a);
  206         DEFAULTRATES(IEEE80211_MODE_11NG,        ieee80211_rateset_11g);
  207 
  208         /*
  209          * 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, int opmode, int flags,
  388         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         }
  451         /* auto-enable s/w beacon miss support */
  452         if (flags & IEEE80211_CLONE_NOBEACONS)
  453                 vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
  454         /* auto-generated or user supplied MAC address */
  455         if (flags & (IEEE80211_CLONE_BSSID|IEEE80211_CLONE_MACADDR))
  456                 vap->iv_flags_ext |= IEEE80211_FEXT_UNIQMAC;
  457         /*
  458          * Enable various functionality by default if we're
  459          * capable; the driver can override us if it knows better.
  460          */
  461         if (vap->iv_caps & IEEE80211_C_WME)
  462                 vap->iv_flags |= IEEE80211_F_WME;
  463         if (vap->iv_caps & IEEE80211_C_BURST)
  464                 vap->iv_flags |= IEEE80211_F_BURST;
  465         /* NB: bg scanning only makes sense for station mode right now */
  466         if (vap->iv_opmode == IEEE80211_M_STA &&
  467             (vap->iv_caps & IEEE80211_C_BGSCAN))
  468                 vap->iv_flags |= IEEE80211_F_BGSCAN;
  469         vap->iv_flags |= IEEE80211_F_DOTH;      /* XXX no cap, just ena */
  470         /* NB: DFS support only makes sense for ap mode right now */
  471         if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
  472             (vap->iv_caps & IEEE80211_C_DFS))
  473                 vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
  474 
  475         vap->iv_des_chan = IEEE80211_CHAN_ANYC;         /* any channel is ok */
  476         vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
  477         vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
  478         /*
  479          * Install a default reset method for the ioctl support;
  480          * the driver can override this.
  481          */
  482         vap->iv_reset = default_reset;
  483 
  484         IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);
  485 
  486         ieee80211_sysctl_vattach(vap);
  487         ieee80211_crypto_vattach(vap);
  488         ieee80211_node_vattach(vap);
  489         ieee80211_power_vattach(vap);
  490         ieee80211_proto_vattach(vap);
  491 #ifdef IEEE80211_SUPPORT_SUPERG
  492         ieee80211_superg_vattach(vap);
  493 #endif
  494         ieee80211_ht_vattach(vap);
  495         ieee80211_scan_vattach(vap);
  496         ieee80211_regdomain_vattach(vap);
  497         ieee80211_radiotap_vattach(vap);
  498         ieee80211_ratectl_set(vap, IEEE80211_RATECTL_NONE);
  499 
  500         return 0;
  501 }
  502 
  503 /*
  504  * Activate a vap.  State should have been prepared with a
  505  * call to ieee80211_vap_setup and by the driver.  On return
  506  * from this call the vap is ready for use.
  507  */
  508 int
  509 ieee80211_vap_attach(struct ieee80211vap *vap,
  510         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  511 {
  512         struct ifnet *ifp = vap->iv_ifp;
  513         struct ieee80211com *ic = vap->iv_ic;
  514         struct ifmediareq imr;
  515         int maxrate;
  516 
  517         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  518             "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
  519             __func__, ieee80211_opmode_name[vap->iv_opmode],
  520             ic->ic_ifp->if_xname, vap->iv_flags, vap->iv_flags_ext);
  521 
  522         /*
  523          * Do late attach work that cannot happen until after
  524          * the driver has had a chance to override defaults.
  525          */
  526         ieee80211_node_latevattach(vap);
  527         ieee80211_power_latevattach(vap);
  528 
  529         maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
  530             vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
  531         ieee80211_media_status(ifp, &imr);
  532         /* NB: strip explicit mode; we're actually in autoselect */
  533         ifmedia_set(&vap->iv_media,
  534             imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
  535         if (maxrate)
  536                 ifp->if_baudrate = IF_Mbps(maxrate);
  537 
  538         ether_ifattach(ifp, vap->iv_myaddr);
  539         if (vap->iv_opmode == IEEE80211_M_MONITOR) {
  540                 /* NB: disallow transmit */
  541                 ifp->if_transmit = null_transmit;
  542                 ifp->if_output = null_output;
  543         } else {
  544                 /* hook output method setup by ether_ifattach */
  545                 vap->iv_output = ifp->if_output;
  546                 ifp->if_output = ieee80211_output;
  547         }
  548         /* NB: if_mtu set by ether_ifattach to ETHERMTU */
  549 
  550         IEEE80211_LOCK(ic);
  551         TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
  552         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  553 #ifdef IEEE80211_SUPPORT_SUPERG
  554         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  555 #endif
  556         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  557         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  558         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  559         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  560         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  561         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  562         IEEE80211_UNLOCK(ic);
  563 
  564         return 1;
  565 }
  566 
  567 /* 
  568  * Tear down vap state and reclaim the ifnet.
  569  * The driver is assumed to have prepared for
  570  * this; e.g. by turning off interrupts for the
  571  * underlying device.
  572  */
  573 void
  574 ieee80211_vap_detach(struct ieee80211vap *vap)
  575 {
  576         struct ieee80211com *ic = vap->iv_ic;
  577         struct ifnet *ifp = vap->iv_ifp;
  578 
  579         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
  580             __func__, ieee80211_opmode_name[vap->iv_opmode],
  581             ic->ic_ifp->if_xname);
  582 
  583         /* NB: bpfdetach is called by ether_ifdetach and claims all taps */
  584         ether_ifdetach(ifp);
  585 
  586         ieee80211_stop(vap);
  587 
  588         /*
  589          * Flush any deferred vap tasks.
  590          */
  591         ieee80211_draintask(ic, &vap->iv_nstate_task);
  592         ieee80211_draintask(ic, &vap->iv_swbmiss_task);
  593 
  594         /* XXX band-aid until ifnet handles this for us */
  595         taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
  596 
  597         IEEE80211_LOCK(ic);
  598         KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
  599         TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
  600         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  601 #ifdef IEEE80211_SUPPORT_SUPERG
  602         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  603 #endif
  604         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  605         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  606         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  607         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  608         /* NB: this handles the bpfdetach done below */
  609         ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
  610         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  611         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  612         IEEE80211_UNLOCK(ic);
  613 
  614         ifmedia_removeall(&vap->iv_media);
  615 
  616         ieee80211_radiotap_vdetach(vap);
  617         ieee80211_regdomain_vdetach(vap);
  618         ieee80211_scan_vdetach(vap);
  619 #ifdef IEEE80211_SUPPORT_SUPERG
  620         ieee80211_superg_vdetach(vap);
  621 #endif
  622         ieee80211_ht_vdetach(vap);
  623         /* NB: must be before ieee80211_node_vdetach */
  624         ieee80211_proto_vdetach(vap);
  625         ieee80211_crypto_vdetach(vap);
  626         ieee80211_power_vdetach(vap);
  627         ieee80211_node_vdetach(vap);
  628         ieee80211_sysctl_vdetach(vap);
  629 
  630         if_free(ifp);
  631 }
  632 
  633 /*
  634  * Synchronize flag bit state in the parent ifnet structure
  635  * according to the state of all vap ifnet's.  This is used,
  636  * for example, to handle IFF_PROMISC and IFF_ALLMULTI.
  637  */
  638 void
  639 ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
  640 {
  641         struct ifnet *ifp = ic->ic_ifp;
  642         struct ieee80211vap *vap;
  643         int bit, oflags;
  644 
  645         IEEE80211_LOCK_ASSERT(ic);
  646 
  647         bit = 0;
  648         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  649                 if (vap->iv_ifp->if_flags & flag) {
  650                         /*
  651                          * XXX the bridge sets PROMISC but we don't want to
  652                          * enable it on the device, discard here so all the
  653                          * drivers don't need to special-case it
  654                          */
  655                         if (flag == IFF_PROMISC &&
  656                             !(vap->iv_opmode == IEEE80211_M_MONITOR ||
  657                               (vap->iv_opmode == IEEE80211_M_AHDEMO &&
  658                                (vap->iv_caps & IEEE80211_C_TDMA) == 0)))
  659                                 continue;
  660                         bit = 1;
  661                         break;
  662                 }
  663         oflags = ifp->if_flags;
  664         if (bit)
  665                 ifp->if_flags |= flag;
  666         else
  667                 ifp->if_flags &= ~flag;
  668         if ((ifp->if_flags ^ oflags) & flag) {
  669                 /* XXX should we return 1/0 and let caller do this? */
  670                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  671                         if (flag == IFF_PROMISC)
  672                                 ieee80211_runtask(ic, &ic->ic_promisc_task);
  673                         else if (flag == IFF_ALLMULTI)
  674                                 ieee80211_runtask(ic, &ic->ic_mcast_task);
  675                 }
  676         }
  677 }
  678 
  679 /*
  680  * Synchronize flag bit state in the com structure
  681  * according to the state of all vap's.  This is used,
  682  * for example, to handle state changes via ioctls.
  683  */
  684 static void
  685 ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
  686 {
  687         struct ieee80211vap *vap;
  688         int bit;
  689 
  690         IEEE80211_LOCK_ASSERT(ic);
  691 
  692         bit = 0;
  693         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  694                 if (vap->iv_flags & flag) {
  695                         bit = 1;
  696                         break;
  697                 }
  698         if (bit)
  699                 ic->ic_flags |= flag;
  700         else
  701                 ic->ic_flags &= ~flag;
  702 }
  703 
  704 void
  705 ieee80211_syncflag(struct ieee80211vap *vap, int flag)
  706 {
  707         struct ieee80211com *ic = vap->iv_ic;
  708 
  709         IEEE80211_LOCK(ic);
  710         if (flag < 0) {
  711                 flag = -flag;
  712                 vap->iv_flags &= ~flag;
  713         } else
  714                 vap->iv_flags |= flag;
  715         ieee80211_syncflag_locked(ic, flag);
  716         IEEE80211_UNLOCK(ic);
  717 }
  718 
  719 /*
  720  * Synchronize flags_ht bit state in the com structure
  721  * according to the state of all vap's.  This is used,
  722  * for example, to handle state changes via ioctls.
  723  */
  724 static void
  725 ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
  726 {
  727         struct ieee80211vap *vap;
  728         int bit;
  729 
  730         IEEE80211_LOCK_ASSERT(ic);
  731 
  732         bit = 0;
  733         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  734                 if (vap->iv_flags_ht & flag) {
  735                         bit = 1;
  736                         break;
  737                 }
  738         if (bit)
  739                 ic->ic_flags_ht |= flag;
  740         else
  741                 ic->ic_flags_ht &= ~flag;
  742 }
  743 
  744 void
  745 ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
  746 {
  747         struct ieee80211com *ic = vap->iv_ic;
  748 
  749         IEEE80211_LOCK(ic);
  750         if (flag < 0) {
  751                 flag = -flag;
  752                 vap->iv_flags_ht &= ~flag;
  753         } else
  754                 vap->iv_flags_ht |= flag;
  755         ieee80211_syncflag_ht_locked(ic, flag);
  756         IEEE80211_UNLOCK(ic);
  757 }
  758 
  759 /*
  760  * Synchronize flags_ext bit state in the com structure
  761  * according to the state of all vap's.  This is used,
  762  * for example, to handle state changes via ioctls.
  763  */
  764 static void
  765 ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
  766 {
  767         struct ieee80211vap *vap;
  768         int bit;
  769 
  770         IEEE80211_LOCK_ASSERT(ic);
  771 
  772         bit = 0;
  773         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  774                 if (vap->iv_flags_ext & flag) {
  775                         bit = 1;
  776                         break;
  777                 }
  778         if (bit)
  779                 ic->ic_flags_ext |= flag;
  780         else
  781                 ic->ic_flags_ext &= ~flag;
  782 }
  783 
  784 void
  785 ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
  786 {
  787         struct ieee80211com *ic = vap->iv_ic;
  788 
  789         IEEE80211_LOCK(ic);
  790         if (flag < 0) {
  791                 flag = -flag;
  792                 vap->iv_flags_ext &= ~flag;
  793         } else
  794                 vap->iv_flags_ext |= flag;
  795         ieee80211_syncflag_ext_locked(ic, flag);
  796         IEEE80211_UNLOCK(ic);
  797 }
  798 
  799 static __inline int
  800 mapgsm(u_int freq, u_int flags)
  801 {
  802         freq *= 10;
  803         if (flags & IEEE80211_CHAN_QUARTER)
  804                 freq += 5;
  805         else if (flags & IEEE80211_CHAN_HALF)
  806                 freq += 10;
  807         else
  808                 freq += 20;
  809         /* NB: there is no 907/20 wide but leave room */
  810         return (freq - 906*10) / 5;
  811 }
  812 
  813 static __inline int
  814 mappsb(u_int freq, u_int flags)
  815 {
  816         return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
  817 }
  818 
  819 /*
  820  * Convert MHz frequency to IEEE channel number.
  821  */
  822 int
  823 ieee80211_mhz2ieee(u_int freq, u_int flags)
  824 {
  825 #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
  826         if (flags & IEEE80211_CHAN_GSM)
  827                 return mapgsm(freq, flags);
  828         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  829                 if (freq == 2484)
  830                         return 14;
  831                 if (freq < 2484)
  832                         return ((int) freq - 2407) / 5;
  833                 else
  834                         return 15 + ((freq - 2512) / 20);
  835         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  836                 if (freq <= 5000) {
  837                         /* XXX check regdomain? */
  838                         if (IS_FREQ_IN_PSB(freq))
  839                                 return mappsb(freq, flags);
  840                         return (freq - 4000) / 5;
  841                 } else
  842                         return (freq - 5000) / 5;
  843         } else {                                /* either, guess */
  844                 if (freq == 2484)
  845                         return 14;
  846                 if (freq < 2484) {
  847                         if (907 <= freq && freq <= 922)
  848                                 return mapgsm(freq, flags);
  849                         return ((int) freq - 2407) / 5;
  850                 }
  851                 if (freq < 5000) {
  852                         if (IS_FREQ_IN_PSB(freq))
  853                                 return mappsb(freq, flags);
  854                         else if (freq > 4900)
  855                                 return (freq - 4000) / 5;
  856                         else
  857                                 return 15 + ((freq - 2512) / 20);
  858                 }
  859                 return (freq - 5000) / 5;
  860         }
  861 #undef IS_FREQ_IN_PSB
  862 }
  863 
  864 /*
  865  * Convert channel to IEEE channel number.
  866  */
  867 int
  868 ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
  869 {
  870         if (c == NULL) {
  871                 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
  872                 return 0;               /* XXX */
  873         }
  874         return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
  875 }
  876 
  877 /*
  878  * Convert IEEE channel number to MHz frequency.
  879  */
  880 u_int
  881 ieee80211_ieee2mhz(u_int chan, u_int flags)
  882 {
  883         if (flags & IEEE80211_CHAN_GSM)
  884                 return 907 + 5 * (chan / 10);
  885         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  886                 if (chan == 14)
  887                         return 2484;
  888                 if (chan < 14)
  889                         return 2407 + chan*5;
  890                 else
  891                         return 2512 + ((chan-15)*20);
  892         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  893                 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
  894                         chan -= 37;
  895                         return 4940 + chan*5 + (chan % 5 ? 2 : 0);
  896                 }
  897                 return 5000 + (chan*5);
  898         } else {                                /* either, guess */
  899                 /* XXX can't distinguish PSB+GSM channels */
  900                 if (chan == 14)
  901                         return 2484;
  902                 if (chan < 14)                  /* 0-13 */
  903                         return 2407 + chan*5;
  904                 if (chan < 27)                  /* 15-26 */
  905                         return 2512 + ((chan-15)*20);
  906                 return 5000 + (chan*5);
  907         }
  908 }
  909 
  910 /*
  911  * Locate a channel given a frequency+flags.  We cache
  912  * the previous lookup to optimize switching between two
  913  * channels--as happens with dynamic turbo.
  914  */
  915 struct ieee80211_channel *
  916 ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
  917 {
  918         struct ieee80211_channel *c;
  919         int i;
  920 
  921         flags &= IEEE80211_CHAN_ALLTURBO;
  922         c = ic->ic_prevchan;
  923         if (c != NULL && c->ic_freq == freq &&
  924             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  925                 return c;
  926         /* brute force search */
  927         for (i = 0; i < ic->ic_nchans; i++) {
  928                 c = &ic->ic_channels[i];
  929                 if (c->ic_freq == freq &&
  930                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  931                         return c;
  932         }
  933         return NULL;
  934 }
  935 
  936 /*
  937  * Locate a channel given a channel number+flags.  We cache
  938  * the previous lookup to optimize switching between two
  939  * channels--as happens with dynamic turbo.
  940  */
  941 struct ieee80211_channel *
  942 ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
  943 {
  944         struct ieee80211_channel *c;
  945         int i;
  946 
  947         flags &= IEEE80211_CHAN_ALLTURBO;
  948         c = ic->ic_prevchan;
  949         if (c != NULL && c->ic_ieee == ieee &&
  950             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  951                 return c;
  952         /* brute force search */
  953         for (i = 0; i < ic->ic_nchans; i++) {
  954                 c = &ic->ic_channels[i];
  955                 if (c->ic_ieee == ieee &&
  956                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  957                         return c;
  958         }
  959         return NULL;
  960 }
  961 
  962 static void
  963 addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
  964 {
  965 #define ADD(_ic, _s, _o) \
  966         ifmedia_add(media, \
  967                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
  968         static const u_int mopts[IEEE80211_MODE_MAX] = { 
  969             [IEEE80211_MODE_AUTO]       = IFM_AUTO,
  970             [IEEE80211_MODE_11A]        = IFM_IEEE80211_11A,
  971             [IEEE80211_MODE_11B]        = IFM_IEEE80211_11B,
  972             [IEEE80211_MODE_11G]        = IFM_IEEE80211_11G,
  973             [IEEE80211_MODE_FH]         = IFM_IEEE80211_FH,
  974             [IEEE80211_MODE_TURBO_A]    = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  975             [IEEE80211_MODE_TURBO_G]    = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
  976             [IEEE80211_MODE_STURBO_A]   = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
  977             [IEEE80211_MODE_HALF]       = IFM_IEEE80211_11A,    /* XXX */
  978             [IEEE80211_MODE_QUARTER]    = IFM_IEEE80211_11A,    /* XXX */
  979             [IEEE80211_MODE_11NA]       = IFM_IEEE80211_11NA,
  980             [IEEE80211_MODE_11NG]       = IFM_IEEE80211_11NG,
  981         };
  982         u_int mopt;
  983 
  984         mopt = mopts[mode];
  985         if (addsta)
  986                 ADD(ic, mword, mopt);   /* STA mode has no cap */
  987         if (caps & IEEE80211_C_IBSS)
  988                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
  989         if (caps & IEEE80211_C_HOSTAP)
  990                 ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
  991         if (caps & IEEE80211_C_AHDEMO)
  992                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
  993         if (caps & IEEE80211_C_MONITOR)
  994                 ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
  995         if (caps & IEEE80211_C_WDS)
  996                 ADD(media, mword, mopt | IFM_IEEE80211_WDS);
  997         if (caps & IEEE80211_C_MBSS)
  998                 ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
  999 #undef ADD
 1000 }
 1001 
 1002 /*
 1003  * Setup the media data structures according to the channel and
 1004  * rate tables.
 1005  */
 1006 static int
 1007 ieee80211_media_setup(struct ieee80211com *ic,
 1008         struct ifmedia *media, int caps, int addsta,
 1009         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
 1010 {
 1011         int i, j, mode, rate, maxrate, mword, r;
 1012         const struct ieee80211_rateset *rs;
 1013         struct ieee80211_rateset allrates;
 1014 
 1015         /*
 1016          * Fill in media characteristics.
 1017          */
 1018         ifmedia_init(media, 0, media_change, media_stat);
 1019         maxrate = 0;
 1020         /*
 1021          * Add media for legacy operating modes.
 1022          */
 1023         memset(&allrates, 0, sizeof(allrates));
 1024         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
 1025                 if (isclr(ic->ic_modecaps, mode))
 1026                         continue;
 1027                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1028                 if (mode == IEEE80211_MODE_AUTO)
 1029                         continue;
 1030                 rs = &ic->ic_sup_rates[mode];
 1031                 for (i = 0; i < rs->rs_nrates; i++) {
 1032                         rate = rs->rs_rates[i];
 1033                         mword = ieee80211_rate2media(ic, rate, mode);
 1034                         if (mword == 0)
 1035                                 continue;
 1036                         addmedia(media, caps, addsta, mode, mword);
 1037                         /*
 1038                          * Add legacy rate to the collection of all rates.
 1039                          */
 1040                         r = rate & IEEE80211_RATE_VAL;
 1041                         for (j = 0; j < allrates.rs_nrates; j++)
 1042                                 if (allrates.rs_rates[j] == r)
 1043                                         break;
 1044                         if (j == allrates.rs_nrates) {
 1045                                 /* unique, add to the set */
 1046                                 allrates.rs_rates[j] = r;
 1047                                 allrates.rs_nrates++;
 1048                         }
 1049                         rate = (rate & IEEE80211_RATE_VAL) / 2;
 1050                         if (rate > maxrate)
 1051                                 maxrate = rate;
 1052                 }
 1053         }
 1054         for (i = 0; i < allrates.rs_nrates; i++) {
 1055                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
 1056                                 IEEE80211_MODE_AUTO);
 1057                 if (mword == 0)
 1058                         continue;
 1059                 /* NB: remove media options from mword */
 1060                 addmedia(media, caps, addsta,
 1061                     IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
 1062         }
 1063         /*
 1064          * Add HT/11n media.  Note that we do not have enough
 1065          * bits in the media subtype to express the MCS so we
 1066          * use a "placeholder" media subtype and any fixed MCS
 1067          * must be specified with a different mechanism.
 1068          */
 1069         for (; mode <= IEEE80211_MODE_11NG; mode++) {
 1070                 if (isclr(ic->ic_modecaps, mode))
 1071                         continue;
 1072                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1073                 addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
 1074         }
 1075         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
 1076             isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
 1077                 addmedia(media, caps, addsta,
 1078                     IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
 1079                 i = ic->ic_txstream * 8 - 1;
 1080                 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
 1081                     (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40))
 1082                         rate = ieee80211_htrates[i].ht40_rate_400ns;
 1083                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40))
 1084                         rate = ieee80211_htrates[i].ht40_rate_800ns;
 1085                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20))
 1086                         rate = ieee80211_htrates[i].ht20_rate_400ns;
 1087                 else
 1088                         rate = ieee80211_htrates[i].ht20_rate_800ns;
 1089                 if (rate > maxrate)
 1090                         maxrate = rate;
 1091         }
 1092         return maxrate;
 1093 }
 1094 
 1095 void
 1096 ieee80211_media_init(struct ieee80211com *ic)
 1097 {
 1098         struct ifnet *ifp = ic->ic_ifp;
 1099         int maxrate;
 1100 
 1101         /* NB: this works because the structure is initialized to zero */
 1102         if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
 1103                 /*
 1104                  * We are re-initializing the channel list; clear
 1105                  * the existing media state as the media routines
 1106                  * don't suppress duplicates.
 1107                  */
 1108                 ifmedia_removeall(&ic->ic_media);
 1109         }
 1110         ieee80211_chan_init(ic);
 1111 
 1112         /*
 1113          * Recalculate media settings in case new channel list changes
 1114          * the set of available modes.
 1115          */
 1116         maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
 1117                 ieee80211com_media_change, ieee80211com_media_status);
 1118         /* NB: strip explicit mode; we're actually in autoselect */
 1119         ifmedia_set(&ic->ic_media,
 1120             media_status(ic->ic_opmode, ic->ic_curchan) &~
 1121                 (IFM_MMASK | IFM_IEEE80211_TURBO));
 1122         if (maxrate)
 1123                 ifp->if_baudrate = IF_Mbps(maxrate);
 1124 
 1125         /* XXX need to propagate new media settings to vap's */
 1126 }
 1127 
 1128 /* XXX inline or eliminate? */
 1129 const struct ieee80211_rateset *
 1130 ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
 1131 {
 1132         /* XXX does this work for 11ng basic rates? */
 1133         return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
 1134 }
 1135 
 1136 void
 1137 ieee80211_announce(struct ieee80211com *ic)
 1138 {
 1139         struct ifnet *ifp = ic->ic_ifp;
 1140         int i, mode, rate, mword;
 1141         const struct ieee80211_rateset *rs;
 1142 
 1143         /* NB: skip AUTO since it has no rates */
 1144         for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
 1145                 if (isclr(ic->ic_modecaps, mode))
 1146                         continue;
 1147                 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
 1148                 rs = &ic->ic_sup_rates[mode];
 1149                 for (i = 0; i < rs->rs_nrates; i++) {
 1150                         mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
 1151                         if (mword == 0)
 1152                                 continue;
 1153                         rate = ieee80211_media2rate(mword);
 1154                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
 1155                             rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
 1156                 }
 1157                 printf("\n");
 1158         }
 1159         ieee80211_ht_announce(ic);
 1160 }
 1161 
 1162 void
 1163 ieee80211_announce_channels(struct ieee80211com *ic)
 1164 {
 1165         const struct ieee80211_channel *c;
 1166         char type;
 1167         int i, cw;
 1168 
 1169         printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
 1170         for (i = 0; i < ic->ic_nchans; i++) {
 1171                 c = &ic->ic_channels[i];
 1172                 if (IEEE80211_IS_CHAN_ST(c))
 1173                         type = 'S';
 1174                 else if (IEEE80211_IS_CHAN_108A(c))
 1175                         type = 'T';
 1176                 else if (IEEE80211_IS_CHAN_108G(c))
 1177                         type = 'G';
 1178                 else if (IEEE80211_IS_CHAN_HT(c))
 1179                         type = 'n';
 1180                 else if (IEEE80211_IS_CHAN_A(c))
 1181                         type = 'a';
 1182                 else if (IEEE80211_IS_CHAN_ANYG(c))
 1183                         type = 'g';
 1184                 else if (IEEE80211_IS_CHAN_B(c))
 1185                         type = 'b';
 1186                 else
 1187                         type = 'f';
 1188                 if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
 1189                         cw = 40;
 1190                 else if (IEEE80211_IS_CHAN_HALF(c))
 1191                         cw = 10;
 1192                 else if (IEEE80211_IS_CHAN_QUARTER(c))
 1193                         cw = 5;
 1194                 else
 1195                         cw = 20;
 1196                 printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
 1197                         , c->ic_ieee, c->ic_freq, type
 1198                         , cw
 1199                         , IEEE80211_IS_CHAN_HT40U(c) ? '+' :
 1200                           IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
 1201                         , c->ic_maxregpower
 1202                         , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
 1203                         , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
 1204                 );
 1205         }
 1206 }
 1207 
 1208 static int
 1209 media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
 1210 {
 1211         switch (IFM_MODE(ime->ifm_media)) {
 1212         case IFM_IEEE80211_11A:
 1213                 *mode = IEEE80211_MODE_11A;
 1214                 break;
 1215         case IFM_IEEE80211_11B:
 1216                 *mode = IEEE80211_MODE_11B;
 1217                 break;
 1218         case IFM_IEEE80211_11G:
 1219                 *mode = IEEE80211_MODE_11G;
 1220                 break;
 1221         case IFM_IEEE80211_FH:
 1222                 *mode = IEEE80211_MODE_FH;
 1223                 break;
 1224         case IFM_IEEE80211_11NA:
 1225                 *mode = IEEE80211_MODE_11NA;
 1226                 break;
 1227         case IFM_IEEE80211_11NG:
 1228                 *mode = IEEE80211_MODE_11NG;
 1229                 break;
 1230         case IFM_AUTO:
 1231                 *mode = IEEE80211_MODE_AUTO;
 1232                 break;
 1233         default:
 1234                 return 0;
 1235         }
 1236         /*
 1237          * Turbo mode is an ``option''.
 1238          * XXX does not apply to AUTO
 1239          */
 1240         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
 1241                 if (*mode == IEEE80211_MODE_11A) {
 1242                         if (flags & IEEE80211_F_TURBOP)
 1243                                 *mode = IEEE80211_MODE_TURBO_A;
 1244                         else
 1245                                 *mode = IEEE80211_MODE_STURBO_A;
 1246                 } else if (*mode == IEEE80211_MODE_11G)
 1247                         *mode = IEEE80211_MODE_TURBO_G;
 1248                 else
 1249                         return 0;
 1250         }
 1251         /* XXX HT40 +/- */
 1252         return 1;
 1253 }
 1254 
 1255 /*
 1256  * Handle a media change request on the underlying interface.
 1257  */
 1258 int
 1259 ieee80211com_media_change(struct ifnet *ifp)
 1260 {
 1261         return EINVAL;
 1262 }
 1263 
 1264 /*
 1265  * Handle a media change request on the vap interface.
 1266  */
 1267 int
 1268 ieee80211_media_change(struct ifnet *ifp)
 1269 {
 1270         struct ieee80211vap *vap = ifp->if_softc;
 1271         struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
 1272         uint16_t newmode;
 1273 
 1274         if (!media2mode(ime, vap->iv_flags, &newmode))
 1275                 return EINVAL;
 1276         if (vap->iv_des_mode != newmode) {
 1277                 vap->iv_des_mode = newmode;
 1278                 /* XXX kick state machine if up+running */
 1279         }
 1280         return 0;
 1281 }
 1282 
 1283 /*
 1284  * Common code to calculate the media status word
 1285  * from the operating mode and channel state.
 1286  */
 1287 static int
 1288 media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
 1289 {
 1290         int status;
 1291 
 1292         status = IFM_IEEE80211;
 1293         switch (opmode) {
 1294         case IEEE80211_M_STA:
 1295                 break;
 1296         case IEEE80211_M_IBSS:
 1297                 status |= IFM_IEEE80211_ADHOC;
 1298                 break;
 1299         case IEEE80211_M_HOSTAP:
 1300                 status |= IFM_IEEE80211_HOSTAP;
 1301                 break;
 1302         case IEEE80211_M_MONITOR:
 1303                 status |= IFM_IEEE80211_MONITOR;
 1304                 break;
 1305         case IEEE80211_M_AHDEMO:
 1306                 status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
 1307                 break;
 1308         case IEEE80211_M_WDS:
 1309                 status |= IFM_IEEE80211_WDS;
 1310                 break;
 1311         case IEEE80211_M_MBSS:
 1312                 status |= IFM_IEEE80211_MBSS;
 1313                 break;
 1314         }
 1315         if (IEEE80211_IS_CHAN_HTA(chan)) {
 1316                 status |= IFM_IEEE80211_11NA;
 1317         } else if (IEEE80211_IS_CHAN_HTG(chan)) {
 1318                 status |= IFM_IEEE80211_11NG;
 1319         } else if (IEEE80211_IS_CHAN_A(chan)) {
 1320                 status |= IFM_IEEE80211_11A;
 1321         } else if (IEEE80211_IS_CHAN_B(chan)) {
 1322                 status |= IFM_IEEE80211_11B;
 1323         } else if (IEEE80211_IS_CHAN_ANYG(chan)) {
 1324                 status |= IFM_IEEE80211_11G;
 1325         } else if (IEEE80211_IS_CHAN_FHSS(chan)) {
 1326                 status |= IFM_IEEE80211_FH;
 1327         }
 1328         /* XXX else complain? */
 1329 
 1330         if (IEEE80211_IS_CHAN_TURBO(chan))
 1331                 status |= IFM_IEEE80211_TURBO;
 1332 #if 0
 1333         if (IEEE80211_IS_CHAN_HT20(chan))
 1334                 status |= IFM_IEEE80211_HT20;
 1335         if (IEEE80211_IS_CHAN_HT40(chan))
 1336                 status |= IFM_IEEE80211_HT40;
 1337 #endif
 1338         return status;
 1339 }
 1340 
 1341 static void
 1342 ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1343 {
 1344         struct ieee80211com *ic = ifp->if_l2com;
 1345         struct ieee80211vap *vap;
 1346 
 1347         imr->ifm_status = IFM_AVALID;
 1348         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 1349                 if (vap->iv_ifp->if_flags & IFF_UP) {
 1350                         imr->ifm_status |= IFM_ACTIVE;
 1351                         break;
 1352                 }
 1353         imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
 1354         if (imr->ifm_status & IFM_ACTIVE)
 1355                 imr->ifm_current = imr->ifm_active;
 1356 }
 1357 
 1358 void
 1359 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1360 {
 1361         struct ieee80211vap *vap = ifp->if_softc;
 1362         struct ieee80211com *ic = vap->iv_ic;
 1363         enum ieee80211_phymode mode;
 1364 
 1365         imr->ifm_status = IFM_AVALID;
 1366         /*
 1367          * NB: use the current channel's mode to lock down a xmit
 1368          * rate only when running; otherwise we may have a mismatch
 1369          * in which case the rate will not be convertible.
 1370          */
 1371         if (vap->iv_state == IEEE80211_S_RUN) {
 1372                 imr->ifm_status |= IFM_ACTIVE;
 1373                 mode = ieee80211_chan2mode(ic->ic_curchan);
 1374         } else
 1375                 mode = IEEE80211_MODE_AUTO;
 1376         imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
 1377         /*
 1378          * Calculate a current rate if possible.
 1379          */
 1380         if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
 1381                 /*
 1382                  * A fixed rate is set, report that.
 1383                  */
 1384                 imr->ifm_active |= ieee80211_rate2media(ic,
 1385                         vap->iv_txparms[mode].ucastrate, mode);
 1386         } else if (vap->iv_opmode == IEEE80211_M_STA) {
 1387                 /*
 1388                  * In station mode report the current transmit rate.
 1389                  */
 1390                 imr->ifm_active |= ieee80211_rate2media(ic,
 1391                         vap->iv_bss->ni_txrate, mode);
 1392         } else
 1393                 imr->ifm_active |= IFM_AUTO;
 1394         if (imr->ifm_status & IFM_ACTIVE)
 1395                 imr->ifm_current = imr->ifm_active;
 1396 }
 1397 
 1398 /*
 1399  * Set the current phy mode and recalculate the active channel
 1400  * set based on the available channels for this mode.  Also
 1401  * select a new default/current channel if the current one is
 1402  * inappropriate for this mode.
 1403  */
 1404 int
 1405 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
 1406 {
 1407         /*
 1408          * Adjust basic rates in 11b/11g supported rate set.
 1409          * Note that if operating on a hal/quarter rate channel
 1410          * this is a noop as those rates sets are different
 1411          * and used instead.
 1412          */
 1413         if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
 1414                 ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
 1415 
 1416         ic->ic_curmode = mode;
 1417         ieee80211_reset_erp(ic);        /* reset ERP state */
 1418 
 1419         return 0;
 1420 }
 1421 
 1422 /*
 1423  * Return the phy mode for with the specified channel.
 1424  */
 1425 enum ieee80211_phymode
 1426 ieee80211_chan2mode(const struct ieee80211_channel *chan)
 1427 {
 1428 
 1429         if (IEEE80211_IS_CHAN_HTA(chan))
 1430                 return IEEE80211_MODE_11NA;
 1431         else if (IEEE80211_IS_CHAN_HTG(chan))
 1432                 return IEEE80211_MODE_11NG;
 1433         else if (IEEE80211_IS_CHAN_108G(chan))
 1434                 return IEEE80211_MODE_TURBO_G;
 1435         else if (IEEE80211_IS_CHAN_ST(chan))
 1436                 return IEEE80211_MODE_STURBO_A;
 1437         else if (IEEE80211_IS_CHAN_TURBO(chan))
 1438                 return IEEE80211_MODE_TURBO_A;
 1439         else if (IEEE80211_IS_CHAN_HALF(chan))
 1440                 return IEEE80211_MODE_HALF;
 1441         else if (IEEE80211_IS_CHAN_QUARTER(chan))
 1442                 return IEEE80211_MODE_QUARTER;
 1443         else if (IEEE80211_IS_CHAN_A(chan))
 1444                 return IEEE80211_MODE_11A;
 1445         else if (IEEE80211_IS_CHAN_ANYG(chan))
 1446                 return IEEE80211_MODE_11G;
 1447         else if (IEEE80211_IS_CHAN_B(chan))
 1448                 return IEEE80211_MODE_11B;
 1449         else if (IEEE80211_IS_CHAN_FHSS(chan))
 1450                 return IEEE80211_MODE_FH;
 1451 
 1452         /* NB: should not get here */
 1453         printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
 1454                 __func__, chan->ic_freq, chan->ic_flags);
 1455         return IEEE80211_MODE_11B;
 1456 }
 1457 
 1458 struct ratemedia {
 1459         u_int   match;  /* rate + mode */
 1460         u_int   media;  /* if_media rate */
 1461 };
 1462 
 1463 static int
 1464 findmedia(const struct ratemedia rates[], int n, u_int match)
 1465 {
 1466         int i;
 1467 
 1468         for (i = 0; i < n; i++)
 1469                 if (rates[i].match == match)
 1470                         return rates[i].media;
 1471         return IFM_AUTO;
 1472 }
 1473 
 1474 /*
 1475  * Convert IEEE80211 rate value to ifmedia subtype.
 1476  * Rate is either a legacy rate in units of 0.5Mbps
 1477  * or an MCS index.
 1478  */
 1479 int
 1480 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
 1481 {
 1482 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1483         static const struct ratemedia rates[] = {
 1484                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
 1485                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
 1486                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
 1487                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
 1488                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
 1489                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
 1490                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
 1491                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
 1492                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
 1493                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
 1494                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
 1495                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
 1496                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
 1497                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
 1498                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
 1499                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
 1500                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
 1501                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
 1502                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
 1503                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
 1504                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
 1505                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
 1506                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
 1507                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
 1508                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
 1509                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
 1510                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
 1511                 {   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
 1512                 {   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
 1513                 {  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
 1514                 /* NB: OFDM72 doesn't realy exist so we don't handle it */
 1515         };
 1516         static const struct ratemedia htrates[] = {
 1517                 {   0, IFM_IEEE80211_MCS },
 1518                 {   1, IFM_IEEE80211_MCS },
 1519                 {   2, IFM_IEEE80211_MCS },
 1520                 {   3, IFM_IEEE80211_MCS },
 1521                 {   4, IFM_IEEE80211_MCS },
 1522                 {   5, IFM_IEEE80211_MCS },
 1523                 {   6, IFM_IEEE80211_MCS },
 1524                 {   7, IFM_IEEE80211_MCS },
 1525                 {   8, IFM_IEEE80211_MCS },
 1526                 {   9, IFM_IEEE80211_MCS },
 1527                 {  10, IFM_IEEE80211_MCS },
 1528                 {  11, IFM_IEEE80211_MCS },
 1529                 {  12, IFM_IEEE80211_MCS },
 1530                 {  13, IFM_IEEE80211_MCS },
 1531                 {  14, IFM_IEEE80211_MCS },
 1532                 {  15, IFM_IEEE80211_MCS },
 1533                 {  16, IFM_IEEE80211_MCS },
 1534                 {  17, IFM_IEEE80211_MCS },
 1535                 {  18, IFM_IEEE80211_MCS },
 1536                 {  19, IFM_IEEE80211_MCS },
 1537                 {  20, IFM_IEEE80211_MCS },
 1538                 {  21, IFM_IEEE80211_MCS },
 1539                 {  22, IFM_IEEE80211_MCS },
 1540                 {  23, IFM_IEEE80211_MCS },
 1541                 {  24, IFM_IEEE80211_MCS },
 1542                 {  25, IFM_IEEE80211_MCS },
 1543                 {  26, IFM_IEEE80211_MCS },
 1544                 {  27, IFM_IEEE80211_MCS },
 1545                 {  28, IFM_IEEE80211_MCS },
 1546                 {  29, IFM_IEEE80211_MCS },
 1547                 {  30, IFM_IEEE80211_MCS },
 1548                 {  31, IFM_IEEE80211_MCS },
 1549                 {  32, IFM_IEEE80211_MCS },
 1550                 {  33, IFM_IEEE80211_MCS },
 1551                 {  34, IFM_IEEE80211_MCS },
 1552                 {  35, IFM_IEEE80211_MCS },
 1553                 {  36, IFM_IEEE80211_MCS },
 1554                 {  37, IFM_IEEE80211_MCS },
 1555                 {  38, IFM_IEEE80211_MCS },
 1556                 {  39, IFM_IEEE80211_MCS },
 1557                 {  40, IFM_IEEE80211_MCS },
 1558                 {  41, IFM_IEEE80211_MCS },
 1559                 {  42, IFM_IEEE80211_MCS },
 1560                 {  43, IFM_IEEE80211_MCS },
 1561                 {  44, IFM_IEEE80211_MCS },
 1562                 {  45, IFM_IEEE80211_MCS },
 1563                 {  46, IFM_IEEE80211_MCS },
 1564                 {  47, IFM_IEEE80211_MCS },
 1565                 {  48, IFM_IEEE80211_MCS },
 1566                 {  49, IFM_IEEE80211_MCS },
 1567                 {  50, IFM_IEEE80211_MCS },
 1568                 {  51, IFM_IEEE80211_MCS },
 1569                 {  52, IFM_IEEE80211_MCS },
 1570                 {  53, IFM_IEEE80211_MCS },
 1571                 {  54, IFM_IEEE80211_MCS },
 1572                 {  55, IFM_IEEE80211_MCS },
 1573                 {  56, IFM_IEEE80211_MCS },
 1574                 {  57, IFM_IEEE80211_MCS },
 1575                 {  58, IFM_IEEE80211_MCS },
 1576                 {  59, IFM_IEEE80211_MCS },
 1577                 {  60, IFM_IEEE80211_MCS },
 1578                 {  61, IFM_IEEE80211_MCS },
 1579                 {  62, IFM_IEEE80211_MCS },
 1580                 {  63, IFM_IEEE80211_MCS },
 1581                 {  64, IFM_IEEE80211_MCS },
 1582                 {  65, IFM_IEEE80211_MCS },
 1583                 {  66, IFM_IEEE80211_MCS },
 1584                 {  67, IFM_IEEE80211_MCS },
 1585                 {  68, IFM_IEEE80211_MCS },
 1586                 {  69, IFM_IEEE80211_MCS },
 1587                 {  70, IFM_IEEE80211_MCS },
 1588                 {  71, IFM_IEEE80211_MCS },
 1589                 {  72, IFM_IEEE80211_MCS },
 1590                 {  73, IFM_IEEE80211_MCS },
 1591                 {  74, IFM_IEEE80211_MCS },
 1592                 {  75, IFM_IEEE80211_MCS },
 1593                 {  76, IFM_IEEE80211_MCS },
 1594         };
 1595         int m;
 1596 
 1597         /*
 1598          * Check 11n rates first for match as an MCS.
 1599          */
 1600         if (mode == IEEE80211_MODE_11NA) {
 1601                 if (rate & IEEE80211_RATE_MCS) {
 1602                         rate &= ~IEEE80211_RATE_MCS;
 1603                         m = findmedia(htrates, N(htrates), rate);
 1604                         if (m != IFM_AUTO)
 1605                                 return m | IFM_IEEE80211_11NA;
 1606                 }
 1607         } else if (mode == IEEE80211_MODE_11NG) {
 1608                 /* NB: 12 is ambiguous, it will be treated as an MCS */
 1609                 if (rate & IEEE80211_RATE_MCS) {
 1610                         rate &= ~IEEE80211_RATE_MCS;
 1611                         m = findmedia(htrates, N(htrates), rate);
 1612                         if (m != IFM_AUTO)
 1613                                 return m | IFM_IEEE80211_11NG;
 1614                 }
 1615         }
 1616         rate &= IEEE80211_RATE_VAL;
 1617         switch (mode) {
 1618         case IEEE80211_MODE_11A:
 1619         case IEEE80211_MODE_HALF:               /* XXX good 'nuf */
 1620         case IEEE80211_MODE_QUARTER:
 1621         case IEEE80211_MODE_11NA:
 1622         case IEEE80211_MODE_TURBO_A:
 1623         case IEEE80211_MODE_STURBO_A:
 1624                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11A);
 1625         case IEEE80211_MODE_11B:
 1626                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B);
 1627         case IEEE80211_MODE_FH:
 1628                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_FH);
 1629         case IEEE80211_MODE_AUTO:
 1630                 /* NB: ic may be NULL for some drivers */
 1631                 if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
 1632                         return findmedia(rates, N(rates),
 1633                             rate | IFM_IEEE80211_FH);
 1634                 /* NB: hack, 11g matches both 11b+11a rates */
 1635                 /* fall thru... */
 1636         case IEEE80211_MODE_11G:
 1637         case IEEE80211_MODE_11NG:
 1638         case IEEE80211_MODE_TURBO_G:
 1639                 return findmedia(rates, N(rates), rate | IFM_IEEE80211_11G);
 1640         }
 1641         return IFM_AUTO;
 1642 #undef N
 1643 }
 1644 
 1645 int
 1646 ieee80211_media2rate(int mword)
 1647 {
 1648 #define N(a)    (sizeof(a) / sizeof(a[0]))
 1649         static const int ieeerates[] = {
 1650                 -1,             /* IFM_AUTO */
 1651                 0,              /* IFM_MANUAL */
 1652                 0,              /* IFM_NONE */
 1653                 2,              /* IFM_IEEE80211_FH1 */
 1654                 4,              /* IFM_IEEE80211_FH2 */
 1655                 2,              /* IFM_IEEE80211_DS1 */
 1656                 4,              /* IFM_IEEE80211_DS2 */
 1657                 11,             /* IFM_IEEE80211_DS5 */
 1658                 22,             /* IFM_IEEE80211_DS11 */
 1659                 44,             /* IFM_IEEE80211_DS22 */
 1660                 12,             /* IFM_IEEE80211_OFDM6 */
 1661                 18,             /* IFM_IEEE80211_OFDM9 */
 1662                 24,             /* IFM_IEEE80211_OFDM12 */
 1663                 36,             /* IFM_IEEE80211_OFDM18 */
 1664                 48,             /* IFM_IEEE80211_OFDM24 */
 1665                 72,             /* IFM_IEEE80211_OFDM36 */
 1666                 96,             /* IFM_IEEE80211_OFDM48 */
 1667                 108,            /* IFM_IEEE80211_OFDM54 */
 1668                 144,            /* IFM_IEEE80211_OFDM72 */
 1669                 0,              /* IFM_IEEE80211_DS354k */
 1670                 0,              /* IFM_IEEE80211_DS512k */
 1671                 6,              /* IFM_IEEE80211_OFDM3 */
 1672                 9,              /* IFM_IEEE80211_OFDM4 */
 1673                 54,             /* IFM_IEEE80211_OFDM27 */
 1674                 -1,             /* IFM_IEEE80211_MCS */
 1675         };
 1676         return IFM_SUBTYPE(mword) < N(ieeerates) ?
 1677                 ieeerates[IFM_SUBTYPE(mword)] : 0;
 1678 #undef N
 1679 }
 1680 
 1681 /*
 1682  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 1683  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 1684  */
 1685 #define mix(a, b, c)                                                    \
 1686 do {                                                                    \
 1687         a -= b; a -= c; a ^= (c >> 13);                                 \
 1688         b -= c; b -= a; b ^= (a << 8);                                  \
 1689         c -= a; c -= b; c ^= (b >> 13);                                 \
 1690         a -= b; a -= c; a ^= (c >> 12);                                 \
 1691         b -= c; b -= a; b ^= (a << 16);                                 \
 1692         c -= a; c -= b; c ^= (b >> 5);                                  \
 1693         a -= b; a -= c; a ^= (c >> 3);                                  \
 1694         b -= c; b -= a; b ^= (a << 10);                                 \
 1695         c -= a; c -= b; c ^= (b >> 15);                                 \
 1696 } while (/*CONSTCOND*/0)
 1697 
 1698 uint32_t
 1699 ieee80211_mac_hash(const struct ieee80211com *ic,
 1700         const uint8_t addr[IEEE80211_ADDR_LEN])
 1701 {
 1702         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
 1703 
 1704         b += addr[5] << 8;
 1705         b += addr[4];
 1706         a += addr[3] << 24;
 1707         a += addr[2] << 16;
 1708         a += addr[1] << 8;
 1709         a += addr[0];
 1710 
 1711         mix(a, b, c);
 1712 
 1713         return c;
 1714 }
 1715 #undef mix

Cache object: 95e14a90af68093e0ebcebf63ecd2e65


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