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/10.0/sys/net80211/ieee80211.c 254315 2013-08-14 04:24:25Z rpaulo $");
   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 #if __FreeBSD_version >= 1000031
  245 static int
  246 null_output(struct ifnet *ifp, struct mbuf *m,
  247         const struct sockaddr *dst, struct route *ro)
  248 #else
  249 static int
  250 null_output(struct ifnet *ifp, struct mbuf *m,
  251         struct sockaddr *dst, struct route *ro)
  252 #endif
  253 {
  254         if_printf(ifp, "discard raw packet\n");
  255         return null_transmit(ifp, m);
  256 }
  257 
  258 static void
  259 null_input(struct ifnet *ifp, struct mbuf *m)
  260 {
  261         if_printf(ifp, "if_input should not be called\n");
  262         m_freem(m);
  263 }
  264 
  265 static void
  266 null_update_chw(struct ieee80211com *ic)
  267 {
  268 
  269         if_printf(ic->ic_ifp, "%s: need callback\n", __func__);
  270 }
  271 
  272 /*
  273  * Attach/setup the common net80211 state.  Called by
  274  * the driver on attach to prior to creating any vap's.
  275  */
  276 void
  277 ieee80211_ifattach(struct ieee80211com *ic,
  278         const uint8_t macaddr[IEEE80211_ADDR_LEN])
  279 {
  280         struct ifnet *ifp = ic->ic_ifp;
  281         struct sockaddr_dl *sdl;
  282         struct ifaddr *ifa;
  283 
  284         KASSERT(ifp->if_type == IFT_IEEE80211, ("if_type %d", ifp->if_type));
  285 
  286         IEEE80211_LOCK_INIT(ic, ifp->if_xname);
  287         IEEE80211_TX_LOCK_INIT(ic, ifp->if_xname);
  288         TAILQ_INIT(&ic->ic_vaps);
  289 
  290         /* Create a taskqueue for all state changes */
  291         ic->ic_tq = taskqueue_create("ic_taskq", M_WAITOK | M_ZERO,
  292             taskqueue_thread_enqueue, &ic->ic_tq);
  293         taskqueue_start_threads(&ic->ic_tq, 1, PI_NET, "%s net80211 taskq",
  294             ifp->if_xname);
  295         /*
  296          * Fill in 802.11 available channel set, mark all
  297          * available channels as active, and pick a default
  298          * channel if not already specified.
  299          */
  300         ieee80211_media_init(ic);
  301 
  302         ic->ic_update_mcast = null_update_mcast;
  303         ic->ic_update_promisc = null_update_promisc;
  304         ic->ic_update_chw = null_update_chw;
  305 
  306         ic->ic_hash_key = arc4random();
  307         ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
  308         ic->ic_lintval = ic->ic_bintval;
  309         ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
  310 
  311         ieee80211_crypto_attach(ic);
  312         ieee80211_node_attach(ic);
  313         ieee80211_power_attach(ic);
  314         ieee80211_proto_attach(ic);
  315 #ifdef IEEE80211_SUPPORT_SUPERG
  316         ieee80211_superg_attach(ic);
  317 #endif
  318         ieee80211_ht_attach(ic);
  319         ieee80211_scan_attach(ic);
  320         ieee80211_regdomain_attach(ic);
  321         ieee80211_dfs_attach(ic);
  322 
  323         ieee80211_sysctl_attach(ic);
  324 
  325         ifp->if_addrlen = IEEE80211_ADDR_LEN;
  326         ifp->if_hdrlen = 0;
  327 
  328         CURVNET_SET(vnet0);
  329 
  330         if_attach(ifp);
  331 
  332         ifp->if_mtu = IEEE80211_MTU_MAX;
  333         ifp->if_broadcastaddr = ieee80211broadcastaddr;
  334         ifp->if_output = null_output;
  335         ifp->if_input = null_input;     /* just in case */
  336         ifp->if_resolvemulti = NULL;    /* NB: callers check */
  337 
  338         ifa = ifaddr_byindex(ifp->if_index);
  339         KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
  340         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  341         sdl->sdl_type = IFT_ETHER;              /* XXX IFT_IEEE80211? */
  342         sdl->sdl_alen = IEEE80211_ADDR_LEN;
  343         IEEE80211_ADDR_COPY(LLADDR(sdl), macaddr);
  344         ifa_free(ifa);
  345 
  346         CURVNET_RESTORE();
  347 }
  348 
  349 /*
  350  * Detach net80211 state on device detach.  Tear down
  351  * all vap's and reclaim all common state prior to the
  352  * device state going away.  Note we may call back into
  353  * driver; it must be prepared for this.
  354  */
  355 void
  356 ieee80211_ifdetach(struct ieee80211com *ic)
  357 {
  358         struct ifnet *ifp = ic->ic_ifp;
  359         struct ieee80211vap *vap;
  360 
  361         /*
  362          * This detaches the main interface, but not the vaps.
  363          * Each VAP may be in a separate VIMAGE.
  364          */
  365         CURVNET_SET(ifp->if_vnet);
  366         if_detach(ifp);
  367         CURVNET_RESTORE();
  368 
  369         /*
  370          * The VAP is responsible for setting and clearing
  371          * the VIMAGE context.
  372          */
  373         while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
  374                 ieee80211_vap_destroy(vap);
  375         ieee80211_waitfor_parent(ic);
  376 
  377         ieee80211_sysctl_detach(ic);
  378         ieee80211_dfs_detach(ic);
  379         ieee80211_regdomain_detach(ic);
  380         ieee80211_scan_detach(ic);
  381 #ifdef IEEE80211_SUPPORT_SUPERG
  382         ieee80211_superg_detach(ic);
  383 #endif
  384         ieee80211_ht_detach(ic);
  385         /* NB: must be called before ieee80211_node_detach */
  386         ieee80211_proto_detach(ic);
  387         ieee80211_crypto_detach(ic);
  388         ieee80211_power_detach(ic);
  389         ieee80211_node_detach(ic);
  390 
  391         /* XXX VNET needed? */
  392         ifmedia_removeall(&ic->ic_media);
  393 
  394         taskqueue_free(ic->ic_tq);
  395         IEEE80211_TX_LOCK_DESTROY(ic);
  396         IEEE80211_LOCK_DESTROY(ic);
  397 }
  398 
  399 /*
  400  * Default reset method for use with the ioctl support.  This
  401  * method is invoked after any state change in the 802.11
  402  * layer that should be propagated to the hardware but not
  403  * require re-initialization of the 802.11 state machine (e.g
  404  * rescanning for an ap).  We always return ENETRESET which
  405  * should cause the driver to re-initialize the device. Drivers
  406  * can override this method to implement more optimized support.
  407  */
  408 static int
  409 default_reset(struct ieee80211vap *vap, u_long cmd)
  410 {
  411         return ENETRESET;
  412 }
  413 
  414 /*
  415  * Prepare a vap for use.  Drivers use this call to
  416  * setup net80211 state in new vap's prior attaching
  417  * them with ieee80211_vap_attach (below).
  418  */
  419 int
  420 ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
  421     const char name[IFNAMSIZ], int unit, enum ieee80211_opmode opmode,
  422     int flags, const uint8_t bssid[IEEE80211_ADDR_LEN],
  423     const uint8_t macaddr[IEEE80211_ADDR_LEN])
  424 {
  425         struct ifnet *ifp;
  426 
  427         ifp = if_alloc(IFT_ETHER);
  428         if (ifp == NULL) {
  429                 if_printf(ic->ic_ifp, "%s: unable to allocate ifnet\n",
  430                     __func__);
  431                 return ENOMEM;
  432         }
  433         if_initname(ifp, name, unit);
  434         ifp->if_softc = vap;                    /* back pointer */
  435         ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
  436         ifp->if_transmit = ieee80211_vap_transmit;
  437         ifp->if_qflush = ieee80211_vap_qflush;
  438         ifp->if_ioctl = ieee80211_ioctl;
  439         ifp->if_init = ieee80211_init;
  440 
  441         vap->iv_ifp = ifp;
  442         vap->iv_ic = ic;
  443         vap->iv_flags = ic->ic_flags;           /* propagate common flags */
  444         vap->iv_flags_ext = ic->ic_flags_ext;
  445         vap->iv_flags_ven = ic->ic_flags_ven;
  446         vap->iv_caps = ic->ic_caps &~ IEEE80211_C_OPMODE;
  447         vap->iv_htcaps = ic->ic_htcaps;
  448         vap->iv_htextcaps = ic->ic_htextcaps;
  449         vap->iv_opmode = opmode;
  450         vap->iv_caps |= ieee80211_opcap[opmode];
  451         switch (opmode) {
  452         case IEEE80211_M_WDS:
  453                 /*
  454                  * WDS links must specify the bssid of the far end.
  455                  * For legacy operation this is a static relationship.
  456                  * For non-legacy operation the station must associate
  457                  * and be authorized to pass traffic.  Plumbing the
  458                  * vap to the proper node happens when the vap
  459                  * transitions to RUN state.
  460                  */
  461                 IEEE80211_ADDR_COPY(vap->iv_des_bssid, bssid);
  462                 vap->iv_flags |= IEEE80211_F_DESBSSID;
  463                 if (flags & IEEE80211_CLONE_WDSLEGACY)
  464                         vap->iv_flags_ext |= IEEE80211_FEXT_WDSLEGACY;
  465                 break;
  466 #ifdef IEEE80211_SUPPORT_TDMA
  467         case IEEE80211_M_AHDEMO:
  468                 if (flags & IEEE80211_CLONE_TDMA) {
  469                         /* NB: checked before clone operation allowed */
  470                         KASSERT(ic->ic_caps & IEEE80211_C_TDMA,
  471                             ("not TDMA capable, ic_caps 0x%x", ic->ic_caps));
  472                         /*
  473                          * Propagate TDMA capability to mark vap; this
  474                          * cannot be removed and is used to distinguish
  475                          * regular ahdemo operation from ahdemo+tdma.
  476                          */
  477                         vap->iv_caps |= IEEE80211_C_TDMA;
  478                 }
  479                 break;
  480 #endif
  481         default:
  482                 break;
  483         }
  484         /* auto-enable s/w beacon miss support */
  485         if (flags & IEEE80211_CLONE_NOBEACONS)
  486                 vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
  487         /* auto-generated or user supplied MAC address */
  488         if (flags & (IEEE80211_CLONE_BSSID|IEEE80211_CLONE_MACADDR))
  489                 vap->iv_flags_ext |= IEEE80211_FEXT_UNIQMAC;
  490         /*
  491          * Enable various functionality by default if we're
  492          * capable; the driver can override us if it knows better.
  493          */
  494         if (vap->iv_caps & IEEE80211_C_WME)
  495                 vap->iv_flags |= IEEE80211_F_WME;
  496         if (vap->iv_caps & IEEE80211_C_BURST)
  497                 vap->iv_flags |= IEEE80211_F_BURST;
  498         /* NB: bg scanning only makes sense for station mode right now */
  499         if (vap->iv_opmode == IEEE80211_M_STA &&
  500             (vap->iv_caps & IEEE80211_C_BGSCAN))
  501                 vap->iv_flags |= IEEE80211_F_BGSCAN;
  502         vap->iv_flags |= IEEE80211_F_DOTH;      /* XXX no cap, just ena */
  503         /* NB: DFS support only makes sense for ap mode right now */
  504         if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
  505             (vap->iv_caps & IEEE80211_C_DFS))
  506                 vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
  507 
  508         vap->iv_des_chan = IEEE80211_CHAN_ANYC;         /* any channel is ok */
  509         vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
  510         vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
  511         /*
  512          * Install a default reset method for the ioctl support;
  513          * the driver can override this.
  514          */
  515         vap->iv_reset = default_reset;
  516 
  517         IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);
  518 
  519         ieee80211_sysctl_vattach(vap);
  520         ieee80211_crypto_vattach(vap);
  521         ieee80211_node_vattach(vap);
  522         ieee80211_power_vattach(vap);
  523         ieee80211_proto_vattach(vap);
  524 #ifdef IEEE80211_SUPPORT_SUPERG
  525         ieee80211_superg_vattach(vap);
  526 #endif
  527         ieee80211_ht_vattach(vap);
  528         ieee80211_scan_vattach(vap);
  529         ieee80211_regdomain_vattach(vap);
  530         ieee80211_radiotap_vattach(vap);
  531         ieee80211_ratectl_set(vap, IEEE80211_RATECTL_NONE);
  532 
  533         return 0;
  534 }
  535 
  536 /*
  537  * Activate a vap.  State should have been prepared with a
  538  * call to ieee80211_vap_setup and by the driver.  On return
  539  * from this call the vap is ready for use.
  540  */
  541 int
  542 ieee80211_vap_attach(struct ieee80211vap *vap,
  543         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  544 {
  545         struct ifnet *ifp = vap->iv_ifp;
  546         struct ieee80211com *ic = vap->iv_ic;
  547         struct ifmediareq imr;
  548         int maxrate;
  549 
  550         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  551             "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
  552             __func__, ieee80211_opmode_name[vap->iv_opmode],
  553             ic->ic_ifp->if_xname, vap->iv_flags, vap->iv_flags_ext);
  554 
  555         /*
  556          * Do late attach work that cannot happen until after
  557          * the driver has had a chance to override defaults.
  558          */
  559         ieee80211_node_latevattach(vap);
  560         ieee80211_power_latevattach(vap);
  561 
  562         maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
  563             vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
  564         ieee80211_media_status(ifp, &imr);
  565         /* NB: strip explicit mode; we're actually in autoselect */
  566         ifmedia_set(&vap->iv_media,
  567             imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
  568         if (maxrate)
  569                 ifp->if_baudrate = IF_Mbps(maxrate);
  570 
  571         ether_ifattach(ifp, vap->iv_myaddr);
  572         if (vap->iv_opmode == IEEE80211_M_MONITOR) {
  573                 /* NB: disallow transmit */
  574                 ifp->if_transmit = null_transmit;
  575                 ifp->if_output = null_output;
  576         } else {
  577                 /* hook output method setup by ether_ifattach */
  578                 vap->iv_output = ifp->if_output;
  579                 ifp->if_output = ieee80211_output;
  580         }
  581         /* NB: if_mtu set by ether_ifattach to ETHERMTU */
  582 
  583         IEEE80211_LOCK(ic);
  584         TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
  585         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  586 #ifdef IEEE80211_SUPPORT_SUPERG
  587         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  588 #endif
  589         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  590         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  591         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  592         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  593         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  594         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  595         IEEE80211_UNLOCK(ic);
  596 
  597         return 1;
  598 }
  599 
  600 /* 
  601  * Tear down vap state and reclaim the ifnet.
  602  * The driver is assumed to have prepared for
  603  * this; e.g. by turning off interrupts for the
  604  * underlying device.
  605  */
  606 void
  607 ieee80211_vap_detach(struct ieee80211vap *vap)
  608 {
  609         struct ieee80211com *ic = vap->iv_ic;
  610         struct ifnet *ifp = vap->iv_ifp;
  611 
  612         CURVNET_SET(ifp->if_vnet);
  613 
  614         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
  615             __func__, ieee80211_opmode_name[vap->iv_opmode],
  616             ic->ic_ifp->if_xname);
  617 
  618         /* NB: bpfdetach is called by ether_ifdetach and claims all taps */
  619         ether_ifdetach(ifp);
  620 
  621         ieee80211_stop(vap);
  622 
  623         /*
  624          * Flush any deferred vap tasks.
  625          */
  626         ieee80211_draintask(ic, &vap->iv_nstate_task);
  627         ieee80211_draintask(ic, &vap->iv_swbmiss_task);
  628 
  629         /* XXX band-aid until ifnet handles this for us */
  630         taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
  631 
  632         IEEE80211_LOCK(ic);
  633         KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
  634         TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
  635         ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
  636 #ifdef IEEE80211_SUPPORT_SUPERG
  637         ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
  638 #endif
  639         ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
  640         ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
  641         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
  642         ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
  643         /* NB: this handles the bpfdetach done below */
  644         ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
  645         ieee80211_syncifflag_locked(ic, IFF_PROMISC);
  646         ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
  647         IEEE80211_UNLOCK(ic);
  648 
  649         ifmedia_removeall(&vap->iv_media);
  650 
  651         ieee80211_radiotap_vdetach(vap);
  652         ieee80211_regdomain_vdetach(vap);
  653         ieee80211_scan_vdetach(vap);
  654 #ifdef IEEE80211_SUPPORT_SUPERG
  655         ieee80211_superg_vdetach(vap);
  656 #endif
  657         ieee80211_ht_vdetach(vap);
  658         /* NB: must be before ieee80211_node_vdetach */
  659         ieee80211_proto_vdetach(vap);
  660         ieee80211_crypto_vdetach(vap);
  661         ieee80211_power_vdetach(vap);
  662         ieee80211_node_vdetach(vap);
  663         ieee80211_sysctl_vdetach(vap);
  664 
  665         if_free(ifp);
  666 
  667         CURVNET_RESTORE();
  668 }
  669 
  670 /*
  671  * Synchronize flag bit state in the parent ifnet structure
  672  * according to the state of all vap ifnet's.  This is used,
  673  * for example, to handle IFF_PROMISC and IFF_ALLMULTI.
  674  */
  675 void
  676 ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
  677 {
  678         struct ifnet *ifp = ic->ic_ifp;
  679         struct ieee80211vap *vap;
  680         int bit, oflags;
  681 
  682         IEEE80211_LOCK_ASSERT(ic);
  683 
  684         bit = 0;
  685         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  686                 if (vap->iv_ifp->if_flags & flag) {
  687                         /*
  688                          * XXX the bridge sets PROMISC but we don't want to
  689                          * enable it on the device, discard here so all the
  690                          * drivers don't need to special-case it
  691                          */
  692                         if (flag == IFF_PROMISC &&
  693                             !(vap->iv_opmode == IEEE80211_M_MONITOR ||
  694                               (vap->iv_opmode == IEEE80211_M_AHDEMO &&
  695                                (vap->iv_caps & IEEE80211_C_TDMA) == 0)))
  696                                 continue;
  697                         bit = 1;
  698                         break;
  699                 }
  700         oflags = ifp->if_flags;
  701         if (bit)
  702                 ifp->if_flags |= flag;
  703         else
  704                 ifp->if_flags &= ~flag;
  705         if ((ifp->if_flags ^ oflags) & flag) {
  706                 /* XXX should we return 1/0 and let caller do this? */
  707                 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
  708                         if (flag == IFF_PROMISC)
  709                                 ieee80211_runtask(ic, &ic->ic_promisc_task);
  710                         else if (flag == IFF_ALLMULTI)
  711                                 ieee80211_runtask(ic, &ic->ic_mcast_task);
  712                 }
  713         }
  714 }
  715 
  716 /*
  717  * Synchronize flag bit state in the com structure
  718  * according to the state of all vap's.  This is used,
  719  * for example, to handle state changes via ioctls.
  720  */
  721 static void
  722 ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
  723 {
  724         struct ieee80211vap *vap;
  725         int bit;
  726 
  727         IEEE80211_LOCK_ASSERT(ic);
  728 
  729         bit = 0;
  730         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  731                 if (vap->iv_flags & flag) {
  732                         bit = 1;
  733                         break;
  734                 }
  735         if (bit)
  736                 ic->ic_flags |= flag;
  737         else
  738                 ic->ic_flags &= ~flag;
  739 }
  740 
  741 void
  742 ieee80211_syncflag(struct ieee80211vap *vap, int flag)
  743 {
  744         struct ieee80211com *ic = vap->iv_ic;
  745 
  746         IEEE80211_LOCK(ic);
  747         if (flag < 0) {
  748                 flag = -flag;
  749                 vap->iv_flags &= ~flag;
  750         } else
  751                 vap->iv_flags |= flag;
  752         ieee80211_syncflag_locked(ic, flag);
  753         IEEE80211_UNLOCK(ic);
  754 }
  755 
  756 /*
  757  * Synchronize flags_ht bit state in the com structure
  758  * according to the state of all vap's.  This is used,
  759  * for example, to handle state changes via ioctls.
  760  */
  761 static void
  762 ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
  763 {
  764         struct ieee80211vap *vap;
  765         int bit;
  766 
  767         IEEE80211_LOCK_ASSERT(ic);
  768 
  769         bit = 0;
  770         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  771                 if (vap->iv_flags_ht & flag) {
  772                         bit = 1;
  773                         break;
  774                 }
  775         if (bit)
  776                 ic->ic_flags_ht |= flag;
  777         else
  778                 ic->ic_flags_ht &= ~flag;
  779 }
  780 
  781 void
  782 ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
  783 {
  784         struct ieee80211com *ic = vap->iv_ic;
  785 
  786         IEEE80211_LOCK(ic);
  787         if (flag < 0) {
  788                 flag = -flag;
  789                 vap->iv_flags_ht &= ~flag;
  790         } else
  791                 vap->iv_flags_ht |= flag;
  792         ieee80211_syncflag_ht_locked(ic, flag);
  793         IEEE80211_UNLOCK(ic);
  794 }
  795 
  796 /*
  797  * Synchronize flags_ext bit state in the com structure
  798  * according to the state of all vap's.  This is used,
  799  * for example, to handle state changes via ioctls.
  800  */
  801 static void
  802 ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
  803 {
  804         struct ieee80211vap *vap;
  805         int bit;
  806 
  807         IEEE80211_LOCK_ASSERT(ic);
  808 
  809         bit = 0;
  810         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
  811                 if (vap->iv_flags_ext & flag) {
  812                         bit = 1;
  813                         break;
  814                 }
  815         if (bit)
  816                 ic->ic_flags_ext |= flag;
  817         else
  818                 ic->ic_flags_ext &= ~flag;
  819 }
  820 
  821 void
  822 ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
  823 {
  824         struct ieee80211com *ic = vap->iv_ic;
  825 
  826         IEEE80211_LOCK(ic);
  827         if (flag < 0) {
  828                 flag = -flag;
  829                 vap->iv_flags_ext &= ~flag;
  830         } else
  831                 vap->iv_flags_ext |= flag;
  832         ieee80211_syncflag_ext_locked(ic, flag);
  833         IEEE80211_UNLOCK(ic);
  834 }
  835 
  836 static __inline int
  837 mapgsm(u_int freq, u_int flags)
  838 {
  839         freq *= 10;
  840         if (flags & IEEE80211_CHAN_QUARTER)
  841                 freq += 5;
  842         else if (flags & IEEE80211_CHAN_HALF)
  843                 freq += 10;
  844         else
  845                 freq += 20;
  846         /* NB: there is no 907/20 wide but leave room */
  847         return (freq - 906*10) / 5;
  848 }
  849 
  850 static __inline int
  851 mappsb(u_int freq, u_int flags)
  852 {
  853         return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
  854 }
  855 
  856 /*
  857  * Convert MHz frequency to IEEE channel number.
  858  */
  859 int
  860 ieee80211_mhz2ieee(u_int freq, u_int flags)
  861 {
  862 #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
  863         if (flags & IEEE80211_CHAN_GSM)
  864                 return mapgsm(freq, flags);
  865         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  866                 if (freq == 2484)
  867                         return 14;
  868                 if (freq < 2484)
  869                         return ((int) freq - 2407) / 5;
  870                 else
  871                         return 15 + ((freq - 2512) / 20);
  872         } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
  873                 if (freq <= 5000) {
  874                         /* XXX check regdomain? */
  875                         if (IS_FREQ_IN_PSB(freq))
  876                                 return mappsb(freq, flags);
  877                         return (freq - 4000) / 5;
  878                 } else
  879                         return (freq - 5000) / 5;
  880         } else {                                /* either, guess */
  881                 if (freq == 2484)
  882                         return 14;
  883                 if (freq < 2484) {
  884                         if (907 <= freq && freq <= 922)
  885                                 return mapgsm(freq, flags);
  886                         return ((int) freq - 2407) / 5;
  887                 }
  888                 if (freq < 5000) {
  889                         if (IS_FREQ_IN_PSB(freq))
  890                                 return mappsb(freq, flags);
  891                         else if (freq > 4900)
  892                                 return (freq - 4000) / 5;
  893                         else
  894                                 return 15 + ((freq - 2512) / 20);
  895                 }
  896                 return (freq - 5000) / 5;
  897         }
  898 #undef IS_FREQ_IN_PSB
  899 }
  900 
  901 /*
  902  * Convert channel to IEEE channel number.
  903  */
  904 int
  905 ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
  906 {
  907         if (c == NULL) {
  908                 if_printf(ic->ic_ifp, "invalid channel (NULL)\n");
  909                 return 0;               /* XXX */
  910         }
  911         return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
  912 }
  913 
  914 /*
  915  * Convert IEEE channel number to MHz frequency.
  916  */
  917 u_int
  918 ieee80211_ieee2mhz(u_int chan, u_int flags)
  919 {
  920         if (flags & IEEE80211_CHAN_GSM)
  921                 return 907 + 5 * (chan / 10);
  922         if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
  923                 if (chan == 14)
  924                         return 2484;
  925                 if (chan < 14)
  926                         return 2407 + chan*5;
  927                 else
  928                         return 2512 + ((chan-15)*20);
  929         } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
  930                 if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
  931                         chan -= 37;
  932                         return 4940 + chan*5 + (chan % 5 ? 2 : 0);
  933                 }
  934                 return 5000 + (chan*5);
  935         } else {                                /* either, guess */
  936                 /* XXX can't distinguish PSB+GSM channels */
  937                 if (chan == 14)
  938                         return 2484;
  939                 if (chan < 14)                  /* 0-13 */
  940                         return 2407 + chan*5;
  941                 if (chan < 27)                  /* 15-26 */
  942                         return 2512 + ((chan-15)*20);
  943                 return 5000 + (chan*5);
  944         }
  945 }
  946 
  947 /*
  948  * Locate a channel given a frequency+flags.  We cache
  949  * the previous lookup to optimize switching between two
  950  * channels--as happens with dynamic turbo.
  951  */
  952 struct ieee80211_channel *
  953 ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
  954 {
  955         struct ieee80211_channel *c;
  956         int i;
  957 
  958         flags &= IEEE80211_CHAN_ALLTURBO;
  959         c = ic->ic_prevchan;
  960         if (c != NULL && c->ic_freq == freq &&
  961             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  962                 return c;
  963         /* brute force search */
  964         for (i = 0; i < ic->ic_nchans; i++) {
  965                 c = &ic->ic_channels[i];
  966                 if (c->ic_freq == freq &&
  967                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  968                         return c;
  969         }
  970         return NULL;
  971 }
  972 
  973 /*
  974  * Locate a channel given a channel number+flags.  We cache
  975  * the previous lookup to optimize switching between two
  976  * channels--as happens with dynamic turbo.
  977  */
  978 struct ieee80211_channel *
  979 ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
  980 {
  981         struct ieee80211_channel *c;
  982         int i;
  983 
  984         flags &= IEEE80211_CHAN_ALLTURBO;
  985         c = ic->ic_prevchan;
  986         if (c != NULL && c->ic_ieee == ieee &&
  987             (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  988                 return c;
  989         /* brute force search */
  990         for (i = 0; i < ic->ic_nchans; i++) {
  991                 c = &ic->ic_channels[i];
  992                 if (c->ic_ieee == ieee &&
  993                     (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
  994                         return c;
  995         }
  996         return NULL;
  997 }
  998 
  999 static void
 1000 addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
 1001 {
 1002 #define ADD(_ic, _s, _o) \
 1003         ifmedia_add(media, \
 1004                 IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
 1005         static const u_int mopts[IEEE80211_MODE_MAX] = { 
 1006             [IEEE80211_MODE_AUTO]       = IFM_AUTO,
 1007             [IEEE80211_MODE_11A]        = IFM_IEEE80211_11A,
 1008             [IEEE80211_MODE_11B]        = IFM_IEEE80211_11B,
 1009             [IEEE80211_MODE_11G]        = IFM_IEEE80211_11G,
 1010             [IEEE80211_MODE_FH]         = IFM_IEEE80211_FH,
 1011             [IEEE80211_MODE_TURBO_A]    = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
 1012             [IEEE80211_MODE_TURBO_G]    = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
 1013             [IEEE80211_MODE_STURBO_A]   = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
 1014             [IEEE80211_MODE_HALF]       = IFM_IEEE80211_11A,    /* XXX */
 1015             [IEEE80211_MODE_QUARTER]    = IFM_IEEE80211_11A,    /* XXX */
 1016             [IEEE80211_MODE_11NA]       = IFM_IEEE80211_11NA,
 1017             [IEEE80211_MODE_11NG]       = IFM_IEEE80211_11NG,
 1018         };
 1019         u_int mopt;
 1020 
 1021         mopt = mopts[mode];
 1022         if (addsta)
 1023                 ADD(ic, mword, mopt);   /* STA mode has no cap */
 1024         if (caps & IEEE80211_C_IBSS)
 1025                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
 1026         if (caps & IEEE80211_C_HOSTAP)
 1027                 ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
 1028         if (caps & IEEE80211_C_AHDEMO)
 1029                 ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
 1030         if (caps & IEEE80211_C_MONITOR)
 1031                 ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
 1032         if (caps & IEEE80211_C_WDS)
 1033                 ADD(media, mword, mopt | IFM_IEEE80211_WDS);
 1034         if (caps & IEEE80211_C_MBSS)
 1035                 ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
 1036 #undef ADD
 1037 }
 1038 
 1039 /*
 1040  * Setup the media data structures according to the channel and
 1041  * rate tables.
 1042  */
 1043 static int
 1044 ieee80211_media_setup(struct ieee80211com *ic,
 1045         struct ifmedia *media, int caps, int addsta,
 1046         ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
 1047 {
 1048         int i, j, rate, maxrate, mword, r;
 1049         enum ieee80211_phymode mode;
 1050         const struct ieee80211_rateset *rs;
 1051         struct ieee80211_rateset allrates;
 1052 
 1053         /*
 1054          * Fill in media characteristics.
 1055          */
 1056         ifmedia_init(media, 0, media_change, media_stat);
 1057         maxrate = 0;
 1058         /*
 1059          * Add media for legacy operating modes.
 1060          */
 1061         memset(&allrates, 0, sizeof(allrates));
 1062         for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
 1063                 if (isclr(ic->ic_modecaps, mode))
 1064                         continue;
 1065                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1066                 if (mode == IEEE80211_MODE_AUTO)
 1067                         continue;
 1068                 rs = &ic->ic_sup_rates[mode];
 1069                 for (i = 0; i < rs->rs_nrates; i++) {
 1070                         rate = rs->rs_rates[i];
 1071                         mword = ieee80211_rate2media(ic, rate, mode);
 1072                         if (mword == 0)
 1073                                 continue;
 1074                         addmedia(media, caps, addsta, mode, mword);
 1075                         /*
 1076                          * Add legacy rate to the collection of all rates.
 1077                          */
 1078                         r = rate & IEEE80211_RATE_VAL;
 1079                         for (j = 0; j < allrates.rs_nrates; j++)
 1080                                 if (allrates.rs_rates[j] == r)
 1081                                         break;
 1082                         if (j == allrates.rs_nrates) {
 1083                                 /* unique, add to the set */
 1084                                 allrates.rs_rates[j] = r;
 1085                                 allrates.rs_nrates++;
 1086                         }
 1087                         rate = (rate & IEEE80211_RATE_VAL) / 2;
 1088                         if (rate > maxrate)
 1089                                 maxrate = rate;
 1090                 }
 1091         }
 1092         for (i = 0; i < allrates.rs_nrates; i++) {
 1093                 mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
 1094                                 IEEE80211_MODE_AUTO);
 1095                 if (mword == 0)
 1096                         continue;
 1097                 /* NB: remove media options from mword */
 1098                 addmedia(media, caps, addsta,
 1099                     IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
 1100         }
 1101         /*
 1102          * Add HT/11n media.  Note that we do not have enough
 1103          * bits in the media subtype to express the MCS so we
 1104          * use a "placeholder" media subtype and any fixed MCS
 1105          * must be specified with a different mechanism.
 1106          */
 1107         for (; mode <= IEEE80211_MODE_11NG; mode++) {
 1108                 if (isclr(ic->ic_modecaps, mode))
 1109                         continue;
 1110                 addmedia(media, caps, addsta, mode, IFM_AUTO);
 1111                 addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
 1112         }
 1113         if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
 1114             isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
 1115                 addmedia(media, caps, addsta,
 1116                     IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
 1117                 i = ic->ic_txstream * 8 - 1;
 1118                 if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
 1119                     (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40))
 1120                         rate = ieee80211_htrates[i].ht40_rate_400ns;
 1121                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40))
 1122                         rate = ieee80211_htrates[i].ht40_rate_800ns;
 1123                 else if ((ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20))
 1124                         rate = ieee80211_htrates[i].ht20_rate_400ns;
 1125                 else
 1126                         rate = ieee80211_htrates[i].ht20_rate_800ns;
 1127                 if (rate > maxrate)
 1128                         maxrate = rate;
 1129         }
 1130         return maxrate;
 1131 }
 1132 
 1133 void
 1134 ieee80211_media_init(struct ieee80211com *ic)
 1135 {
 1136         struct ifnet *ifp = ic->ic_ifp;
 1137         int maxrate;
 1138 
 1139         /* NB: this works because the structure is initialized to zero */
 1140         if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
 1141                 /*
 1142                  * We are re-initializing the channel list; clear
 1143                  * the existing media state as the media routines
 1144                  * don't suppress duplicates.
 1145                  */
 1146                 ifmedia_removeall(&ic->ic_media);
 1147         }
 1148         ieee80211_chan_init(ic);
 1149 
 1150         /*
 1151          * Recalculate media settings in case new channel list changes
 1152          * the set of available modes.
 1153          */
 1154         maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
 1155                 ieee80211com_media_change, ieee80211com_media_status);
 1156         /* NB: strip explicit mode; we're actually in autoselect */
 1157         ifmedia_set(&ic->ic_media,
 1158             media_status(ic->ic_opmode, ic->ic_curchan) &~
 1159                 (IFM_MMASK | IFM_IEEE80211_TURBO));
 1160         if (maxrate)
 1161                 ifp->if_baudrate = IF_Mbps(maxrate);
 1162 
 1163         /* XXX need to propagate new media settings to vap's */
 1164 }
 1165 
 1166 /* XXX inline or eliminate? */
 1167 const struct ieee80211_rateset *
 1168 ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
 1169 {
 1170         /* XXX does this work for 11ng basic rates? */
 1171         return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
 1172 }
 1173 
 1174 void
 1175 ieee80211_announce(struct ieee80211com *ic)
 1176 {
 1177         struct ifnet *ifp = ic->ic_ifp;
 1178         int i, rate, mword;
 1179         enum ieee80211_phymode mode;
 1180         const struct ieee80211_rateset *rs;
 1181 
 1182         /* NB: skip AUTO since it has no rates */
 1183         for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
 1184                 if (isclr(ic->ic_modecaps, mode))
 1185                         continue;
 1186                 if_printf(ifp, "%s rates: ", ieee80211_phymode_name[mode]);
 1187                 rs = &ic->ic_sup_rates[mode];
 1188                 for (i = 0; i < rs->rs_nrates; i++) {
 1189                         mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
 1190                         if (mword == 0)
 1191                                 continue;
 1192                         rate = ieee80211_media2rate(mword);
 1193                         printf("%s%d%sMbps", (i != 0 ? " " : ""),
 1194                             rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
 1195                 }
 1196                 printf("\n");
 1197         }
 1198         ieee80211_ht_announce(ic);
 1199 }
 1200 
 1201 void
 1202 ieee80211_announce_channels(struct ieee80211com *ic)
 1203 {
 1204         const struct ieee80211_channel *c;
 1205         char type;
 1206         int i, cw;
 1207 
 1208         printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
 1209         for (i = 0; i < ic->ic_nchans; i++) {
 1210                 c = &ic->ic_channels[i];
 1211                 if (IEEE80211_IS_CHAN_ST(c))
 1212                         type = 'S';
 1213                 else if (IEEE80211_IS_CHAN_108A(c))
 1214                         type = 'T';
 1215                 else if (IEEE80211_IS_CHAN_108G(c))
 1216                         type = 'G';
 1217                 else if (IEEE80211_IS_CHAN_HT(c))
 1218                         type = 'n';
 1219                 else if (IEEE80211_IS_CHAN_A(c))
 1220                         type = 'a';
 1221                 else if (IEEE80211_IS_CHAN_ANYG(c))
 1222                         type = 'g';
 1223                 else if (IEEE80211_IS_CHAN_B(c))
 1224                         type = 'b';
 1225                 else
 1226                         type = 'f';
 1227                 if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
 1228                         cw = 40;
 1229                 else if (IEEE80211_IS_CHAN_HALF(c))
 1230                         cw = 10;
 1231                 else if (IEEE80211_IS_CHAN_QUARTER(c))
 1232                         cw = 5;
 1233                 else
 1234                         cw = 20;
 1235                 printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
 1236                         , c->ic_ieee, c->ic_freq, type
 1237                         , cw
 1238                         , IEEE80211_IS_CHAN_HT40U(c) ? '+' :
 1239                           IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
 1240                         , c->ic_maxregpower
 1241                         , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
 1242                         , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
 1243                 );
 1244         }
 1245 }
 1246 
 1247 static int
 1248 media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
 1249 {
 1250         switch (IFM_MODE(ime->ifm_media)) {
 1251         case IFM_IEEE80211_11A:
 1252                 *mode = IEEE80211_MODE_11A;
 1253                 break;
 1254         case IFM_IEEE80211_11B:
 1255                 *mode = IEEE80211_MODE_11B;
 1256                 break;
 1257         case IFM_IEEE80211_11G:
 1258                 *mode = IEEE80211_MODE_11G;
 1259                 break;
 1260         case IFM_IEEE80211_FH:
 1261                 *mode = IEEE80211_MODE_FH;
 1262                 break;
 1263         case IFM_IEEE80211_11NA:
 1264                 *mode = IEEE80211_MODE_11NA;
 1265                 break;
 1266         case IFM_IEEE80211_11NG:
 1267                 *mode = IEEE80211_MODE_11NG;
 1268                 break;
 1269         case IFM_AUTO:
 1270                 *mode = IEEE80211_MODE_AUTO;
 1271                 break;
 1272         default:
 1273                 return 0;
 1274         }
 1275         /*
 1276          * Turbo mode is an ``option''.
 1277          * XXX does not apply to AUTO
 1278          */
 1279         if (ime->ifm_media & IFM_IEEE80211_TURBO) {
 1280                 if (*mode == IEEE80211_MODE_11A) {
 1281                         if (flags & IEEE80211_F_TURBOP)
 1282                                 *mode = IEEE80211_MODE_TURBO_A;
 1283                         else
 1284                                 *mode = IEEE80211_MODE_STURBO_A;
 1285                 } else if (*mode == IEEE80211_MODE_11G)
 1286                         *mode = IEEE80211_MODE_TURBO_G;
 1287                 else
 1288                         return 0;
 1289         }
 1290         /* XXX HT40 +/- */
 1291         return 1;
 1292 }
 1293 
 1294 /*
 1295  * Handle a media change request on the underlying interface.
 1296  */
 1297 int
 1298 ieee80211com_media_change(struct ifnet *ifp)
 1299 {
 1300         return EINVAL;
 1301 }
 1302 
 1303 /*
 1304  * Handle a media change request on the vap interface.
 1305  */
 1306 int
 1307 ieee80211_media_change(struct ifnet *ifp)
 1308 {
 1309         struct ieee80211vap *vap = ifp->if_softc;
 1310         struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
 1311         uint16_t newmode;
 1312 
 1313         if (!media2mode(ime, vap->iv_flags, &newmode))
 1314                 return EINVAL;
 1315         if (vap->iv_des_mode != newmode) {
 1316                 vap->iv_des_mode = newmode;
 1317                 /* XXX kick state machine if up+running */
 1318         }
 1319         return 0;
 1320 }
 1321 
 1322 /*
 1323  * Common code to calculate the media status word
 1324  * from the operating mode and channel state.
 1325  */
 1326 static int
 1327 media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
 1328 {
 1329         int status;
 1330 
 1331         status = IFM_IEEE80211;
 1332         switch (opmode) {
 1333         case IEEE80211_M_STA:
 1334                 break;
 1335         case IEEE80211_M_IBSS:
 1336                 status |= IFM_IEEE80211_ADHOC;
 1337                 break;
 1338         case IEEE80211_M_HOSTAP:
 1339                 status |= IFM_IEEE80211_HOSTAP;
 1340                 break;
 1341         case IEEE80211_M_MONITOR:
 1342                 status |= IFM_IEEE80211_MONITOR;
 1343                 break;
 1344         case IEEE80211_M_AHDEMO:
 1345                 status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
 1346                 break;
 1347         case IEEE80211_M_WDS:
 1348                 status |= IFM_IEEE80211_WDS;
 1349                 break;
 1350         case IEEE80211_M_MBSS:
 1351                 status |= IFM_IEEE80211_MBSS;
 1352                 break;
 1353         }
 1354         if (IEEE80211_IS_CHAN_HTA(chan)) {
 1355                 status |= IFM_IEEE80211_11NA;
 1356         } else if (IEEE80211_IS_CHAN_HTG(chan)) {
 1357                 status |= IFM_IEEE80211_11NG;
 1358         } else if (IEEE80211_IS_CHAN_A(chan)) {
 1359                 status |= IFM_IEEE80211_11A;
 1360         } else if (IEEE80211_IS_CHAN_B(chan)) {
 1361                 status |= IFM_IEEE80211_11B;
 1362         } else if (IEEE80211_IS_CHAN_ANYG(chan)) {
 1363                 status |= IFM_IEEE80211_11G;
 1364         } else if (IEEE80211_IS_CHAN_FHSS(chan)) {
 1365                 status |= IFM_IEEE80211_FH;
 1366         }
 1367         /* XXX else complain? */
 1368 
 1369         if (IEEE80211_IS_CHAN_TURBO(chan))
 1370                 status |= IFM_IEEE80211_TURBO;
 1371 #if 0
 1372         if (IEEE80211_IS_CHAN_HT20(chan))
 1373                 status |= IFM_IEEE80211_HT20;
 1374         if (IEEE80211_IS_CHAN_HT40(chan))
 1375                 status |= IFM_IEEE80211_HT40;
 1376 #endif
 1377         return status;
 1378 }
 1379 
 1380 static void
 1381 ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1382 {
 1383         struct ieee80211com *ic = ifp->if_l2com;
 1384         struct ieee80211vap *vap;
 1385 
 1386         imr->ifm_status = IFM_AVALID;
 1387         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
 1388                 if (vap->iv_ifp->if_flags & IFF_UP) {
 1389                         imr->ifm_status |= IFM_ACTIVE;
 1390                         break;
 1391                 }
 1392         imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
 1393         if (imr->ifm_status & IFM_ACTIVE)
 1394                 imr->ifm_current = imr->ifm_active;
 1395 }
 1396 
 1397 void
 1398 ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
 1399 {
 1400         struct ieee80211vap *vap = ifp->if_softc;
 1401         struct ieee80211com *ic = vap->iv_ic;
 1402         enum ieee80211_phymode mode;
 1403 
 1404         imr->ifm_status = IFM_AVALID;
 1405         /*
 1406          * NB: use the current channel's mode to lock down a xmit
 1407          * rate only when running; otherwise we may have a mismatch
 1408          * in which case the rate will not be convertible.
 1409          */
 1410         if (vap->iv_state == IEEE80211_S_RUN) {
 1411                 imr->ifm_status |= IFM_ACTIVE;
 1412                 mode = ieee80211_chan2mode(ic->ic_curchan);
 1413         } else
 1414                 mode = IEEE80211_MODE_AUTO;
 1415         imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
 1416         /*
 1417          * Calculate a current rate if possible.
 1418          */
 1419         if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
 1420                 /*
 1421                  * A fixed rate is set, report that.
 1422                  */
 1423                 imr->ifm_active |= ieee80211_rate2media(ic,
 1424                         vap->iv_txparms[mode].ucastrate, mode);
 1425         } else if (vap->iv_opmode == IEEE80211_M_STA) {
 1426                 /*
 1427                  * In station mode report the current transmit rate.
 1428                  */
 1429                 imr->ifm_active |= ieee80211_rate2media(ic,
 1430                         vap->iv_bss->ni_txrate, mode);
 1431         } else
 1432                 imr->ifm_active |= IFM_AUTO;
 1433         if (imr->ifm_status & IFM_ACTIVE)
 1434                 imr->ifm_current = imr->ifm_active;
 1435 }
 1436 
 1437 /*
 1438  * Set the current phy mode and recalculate the active channel
 1439  * set based on the available channels for this mode.  Also
 1440  * select a new default/current channel if the current one is
 1441  * inappropriate for this mode.
 1442  */
 1443 int
 1444 ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
 1445 {
 1446         /*
 1447          * Adjust basic rates in 11b/11g supported rate set.
 1448          * Note that if operating on a hal/quarter rate channel
 1449          * this is a noop as those rates sets are different
 1450          * and used instead.
 1451          */
 1452         if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
 1453                 ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
 1454 
 1455         ic->ic_curmode = mode;
 1456         ieee80211_reset_erp(ic);        /* reset ERP state */
 1457 
 1458         return 0;
 1459 }
 1460 
 1461 /*
 1462  * Return the phy mode for with the specified channel.
 1463  */
 1464 enum ieee80211_phymode
 1465 ieee80211_chan2mode(const struct ieee80211_channel *chan)
 1466 {
 1467 
 1468         if (IEEE80211_IS_CHAN_HTA(chan))
 1469                 return IEEE80211_MODE_11NA;
 1470         else if (IEEE80211_IS_CHAN_HTG(chan))
 1471                 return IEEE80211_MODE_11NG;
 1472         else if (IEEE80211_IS_CHAN_108G(chan))
 1473                 return IEEE80211_MODE_TURBO_G;
 1474         else if (IEEE80211_IS_CHAN_ST(chan))
 1475                 return IEEE80211_MODE_STURBO_A;
 1476         else if (IEEE80211_IS_CHAN_TURBO(chan))
 1477                 return IEEE80211_MODE_TURBO_A;
 1478         else if (IEEE80211_IS_CHAN_HALF(chan))
 1479                 return IEEE80211_MODE_HALF;
 1480         else if (IEEE80211_IS_CHAN_QUARTER(chan))
 1481                 return IEEE80211_MODE_QUARTER;
 1482         else if (IEEE80211_IS_CHAN_A(chan))
 1483                 return IEEE80211_MODE_11A;
 1484         else if (IEEE80211_IS_CHAN_ANYG(chan))
 1485                 return IEEE80211_MODE_11G;
 1486         else if (IEEE80211_IS_CHAN_B(chan))
 1487                 return IEEE80211_MODE_11B;
 1488         else if (IEEE80211_IS_CHAN_FHSS(chan))
 1489                 return IEEE80211_MODE_FH;
 1490 
 1491         /* NB: should not get here */
 1492         printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
 1493                 __func__, chan->ic_freq, chan->ic_flags);
 1494         return IEEE80211_MODE_11B;
 1495 }
 1496 
 1497 struct ratemedia {
 1498         u_int   match;  /* rate + mode */
 1499         u_int   media;  /* if_media rate */
 1500 };
 1501 
 1502 static int
 1503 findmedia(const struct ratemedia rates[], int n, u_int match)
 1504 {
 1505         int i;
 1506 
 1507         for (i = 0; i < n; i++)
 1508                 if (rates[i].match == match)
 1509                         return rates[i].media;
 1510         return IFM_AUTO;
 1511 }
 1512 
 1513 /*
 1514  * Convert IEEE80211 rate value to ifmedia subtype.
 1515  * Rate is either a legacy rate in units of 0.5Mbps
 1516  * or an MCS index.
 1517  */
 1518 int
 1519 ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
 1520 {
 1521         static const struct ratemedia rates[] = {
 1522                 {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
 1523                 {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
 1524                 {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
 1525                 {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
 1526                 {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
 1527                 {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
 1528                 {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
 1529                 {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
 1530                 {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
 1531                 {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
 1532                 {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
 1533                 {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
 1534                 {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
 1535                 {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
 1536                 { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
 1537                 {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
 1538                 {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
 1539                 {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
 1540                 {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
 1541                 {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
 1542                 {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
 1543                 {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
 1544                 {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
 1545                 {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
 1546                 {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
 1547                 {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
 1548                 { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
 1549                 {   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
 1550                 {   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
 1551                 {  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
 1552                 /* NB: OFDM72 doesn't realy exist so we don't handle it */
 1553         };
 1554         static const struct ratemedia htrates[] = {
 1555                 {   0, IFM_IEEE80211_MCS },
 1556                 {   1, IFM_IEEE80211_MCS },
 1557                 {   2, IFM_IEEE80211_MCS },
 1558                 {   3, IFM_IEEE80211_MCS },
 1559                 {   4, IFM_IEEE80211_MCS },
 1560                 {   5, IFM_IEEE80211_MCS },
 1561                 {   6, IFM_IEEE80211_MCS },
 1562                 {   7, IFM_IEEE80211_MCS },
 1563                 {   8, IFM_IEEE80211_MCS },
 1564                 {   9, IFM_IEEE80211_MCS },
 1565                 {  10, IFM_IEEE80211_MCS },
 1566                 {  11, IFM_IEEE80211_MCS },
 1567                 {  12, IFM_IEEE80211_MCS },
 1568                 {  13, IFM_IEEE80211_MCS },
 1569                 {  14, IFM_IEEE80211_MCS },
 1570                 {  15, IFM_IEEE80211_MCS },
 1571                 {  16, IFM_IEEE80211_MCS },
 1572                 {  17, IFM_IEEE80211_MCS },
 1573                 {  18, IFM_IEEE80211_MCS },
 1574                 {  19, IFM_IEEE80211_MCS },
 1575                 {  20, IFM_IEEE80211_MCS },
 1576                 {  21, IFM_IEEE80211_MCS },
 1577                 {  22, IFM_IEEE80211_MCS },
 1578                 {  23, IFM_IEEE80211_MCS },
 1579                 {  24, IFM_IEEE80211_MCS },
 1580                 {  25, IFM_IEEE80211_MCS },
 1581                 {  26, IFM_IEEE80211_MCS },
 1582                 {  27, IFM_IEEE80211_MCS },
 1583                 {  28, IFM_IEEE80211_MCS },
 1584                 {  29, IFM_IEEE80211_MCS },
 1585                 {  30, IFM_IEEE80211_MCS },
 1586                 {  31, IFM_IEEE80211_MCS },
 1587                 {  32, IFM_IEEE80211_MCS },
 1588                 {  33, IFM_IEEE80211_MCS },
 1589                 {  34, IFM_IEEE80211_MCS },
 1590                 {  35, IFM_IEEE80211_MCS },
 1591                 {  36, IFM_IEEE80211_MCS },
 1592                 {  37, IFM_IEEE80211_MCS },
 1593                 {  38, IFM_IEEE80211_MCS },
 1594                 {  39, IFM_IEEE80211_MCS },
 1595                 {  40, IFM_IEEE80211_MCS },
 1596                 {  41, IFM_IEEE80211_MCS },
 1597                 {  42, IFM_IEEE80211_MCS },
 1598                 {  43, IFM_IEEE80211_MCS },
 1599                 {  44, IFM_IEEE80211_MCS },
 1600                 {  45, IFM_IEEE80211_MCS },
 1601                 {  46, IFM_IEEE80211_MCS },
 1602                 {  47, IFM_IEEE80211_MCS },
 1603                 {  48, IFM_IEEE80211_MCS },
 1604                 {  49, IFM_IEEE80211_MCS },
 1605                 {  50, IFM_IEEE80211_MCS },
 1606                 {  51, IFM_IEEE80211_MCS },
 1607                 {  52, IFM_IEEE80211_MCS },
 1608                 {  53, IFM_IEEE80211_MCS },
 1609                 {  54, IFM_IEEE80211_MCS },
 1610                 {  55, IFM_IEEE80211_MCS },
 1611                 {  56, IFM_IEEE80211_MCS },
 1612                 {  57, IFM_IEEE80211_MCS },
 1613                 {  58, IFM_IEEE80211_MCS },
 1614                 {  59, IFM_IEEE80211_MCS },
 1615                 {  60, IFM_IEEE80211_MCS },
 1616                 {  61, IFM_IEEE80211_MCS },
 1617                 {  62, IFM_IEEE80211_MCS },
 1618                 {  63, IFM_IEEE80211_MCS },
 1619                 {  64, IFM_IEEE80211_MCS },
 1620                 {  65, IFM_IEEE80211_MCS },
 1621                 {  66, IFM_IEEE80211_MCS },
 1622                 {  67, IFM_IEEE80211_MCS },
 1623                 {  68, IFM_IEEE80211_MCS },
 1624                 {  69, IFM_IEEE80211_MCS },
 1625                 {  70, IFM_IEEE80211_MCS },
 1626                 {  71, IFM_IEEE80211_MCS },
 1627                 {  72, IFM_IEEE80211_MCS },
 1628                 {  73, IFM_IEEE80211_MCS },
 1629                 {  74, IFM_IEEE80211_MCS },
 1630                 {  75, IFM_IEEE80211_MCS },
 1631                 {  76, IFM_IEEE80211_MCS },
 1632         };
 1633         int m;
 1634 
 1635         /*
 1636          * Check 11n rates first for match as an MCS.
 1637          */
 1638         if (mode == IEEE80211_MODE_11NA) {
 1639                 if (rate & IEEE80211_RATE_MCS) {
 1640                         rate &= ~IEEE80211_RATE_MCS;
 1641                         m = findmedia(htrates, nitems(htrates), rate);
 1642                         if (m != IFM_AUTO)
 1643                                 return m | IFM_IEEE80211_11NA;
 1644                 }
 1645         } else if (mode == IEEE80211_MODE_11NG) {
 1646                 /* NB: 12 is ambiguous, it will be treated as an MCS */
 1647                 if (rate & IEEE80211_RATE_MCS) {
 1648                         rate &= ~IEEE80211_RATE_MCS;
 1649                         m = findmedia(htrates, nitems(htrates), rate);
 1650                         if (m != IFM_AUTO)
 1651                                 return m | IFM_IEEE80211_11NG;
 1652                 }
 1653         }
 1654         rate &= IEEE80211_RATE_VAL;
 1655         switch (mode) {
 1656         case IEEE80211_MODE_11A:
 1657         case IEEE80211_MODE_HALF:               /* XXX good 'nuf */
 1658         case IEEE80211_MODE_QUARTER:
 1659         case IEEE80211_MODE_11NA:
 1660         case IEEE80211_MODE_TURBO_A:
 1661         case IEEE80211_MODE_STURBO_A:
 1662                 return findmedia(rates, nitems(rates), 
 1663                     rate | IFM_IEEE80211_11A);
 1664         case IEEE80211_MODE_11B:
 1665                 return findmedia(rates, nitems(rates), 
 1666                     rate | IFM_IEEE80211_11B);
 1667         case IEEE80211_MODE_FH:
 1668                 return findmedia(rates, nitems(rates), 
 1669                     rate | IFM_IEEE80211_FH);
 1670         case IEEE80211_MODE_AUTO:
 1671                 /* NB: ic may be NULL for some drivers */
 1672                 if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
 1673                         return findmedia(rates, nitems(rates),
 1674                             rate | IFM_IEEE80211_FH);
 1675                 /* NB: hack, 11g matches both 11b+11a rates */
 1676                 /* fall thru... */
 1677         case IEEE80211_MODE_11G:
 1678         case IEEE80211_MODE_11NG:
 1679         case IEEE80211_MODE_TURBO_G:
 1680                 return findmedia(rates, nitems(rates), rate | IFM_IEEE80211_11G);
 1681         }
 1682         return IFM_AUTO;
 1683 }
 1684 
 1685 int
 1686 ieee80211_media2rate(int mword)
 1687 {
 1688         static const int ieeerates[] = {
 1689                 -1,             /* IFM_AUTO */
 1690                 0,              /* IFM_MANUAL */
 1691                 0,              /* IFM_NONE */
 1692                 2,              /* IFM_IEEE80211_FH1 */
 1693                 4,              /* IFM_IEEE80211_FH2 */
 1694                 2,              /* IFM_IEEE80211_DS1 */
 1695                 4,              /* IFM_IEEE80211_DS2 */
 1696                 11,             /* IFM_IEEE80211_DS5 */
 1697                 22,             /* IFM_IEEE80211_DS11 */
 1698                 44,             /* IFM_IEEE80211_DS22 */
 1699                 12,             /* IFM_IEEE80211_OFDM6 */
 1700                 18,             /* IFM_IEEE80211_OFDM9 */
 1701                 24,             /* IFM_IEEE80211_OFDM12 */
 1702                 36,             /* IFM_IEEE80211_OFDM18 */
 1703                 48,             /* IFM_IEEE80211_OFDM24 */
 1704                 72,             /* IFM_IEEE80211_OFDM36 */
 1705                 96,             /* IFM_IEEE80211_OFDM48 */
 1706                 108,            /* IFM_IEEE80211_OFDM54 */
 1707                 144,            /* IFM_IEEE80211_OFDM72 */
 1708                 0,              /* IFM_IEEE80211_DS354k */
 1709                 0,              /* IFM_IEEE80211_DS512k */
 1710                 6,              /* IFM_IEEE80211_OFDM3 */
 1711                 9,              /* IFM_IEEE80211_OFDM4 */
 1712                 54,             /* IFM_IEEE80211_OFDM27 */
 1713                 -1,             /* IFM_IEEE80211_MCS */
 1714         };
 1715         return IFM_SUBTYPE(mword) < nitems(ieeerates) ?
 1716                 ieeerates[IFM_SUBTYPE(mword)] : 0;
 1717 }
 1718 
 1719 /*
 1720  * The following hash function is adapted from "Hash Functions" by Bob Jenkins
 1721  * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
 1722  */
 1723 #define mix(a, b, c)                                                    \
 1724 do {                                                                    \
 1725         a -= b; a -= c; a ^= (c >> 13);                                 \
 1726         b -= c; b -= a; b ^= (a << 8);                                  \
 1727         c -= a; c -= b; c ^= (b >> 13);                                 \
 1728         a -= b; a -= c; a ^= (c >> 12);                                 \
 1729         b -= c; b -= a; b ^= (a << 16);                                 \
 1730         c -= a; c -= b; c ^= (b >> 5);                                  \
 1731         a -= b; a -= c; a ^= (c >> 3);                                  \
 1732         b -= c; b -= a; b ^= (a << 10);                                 \
 1733         c -= a; c -= b; c ^= (b >> 15);                                 \
 1734 } while (/*CONSTCOND*/0)
 1735 
 1736 uint32_t
 1737 ieee80211_mac_hash(const struct ieee80211com *ic,
 1738         const uint8_t addr[IEEE80211_ADDR_LEN])
 1739 {
 1740         uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
 1741 
 1742         b += addr[5] << 8;
 1743         b += addr[4];
 1744         a += addr[3] << 24;
 1745         a += addr[2] << 16;
 1746         a += addr[1] << 8;
 1747         a += addr[0];
 1748 
 1749         mix(a, b, c);
 1750 
 1751         return c;
 1752 }
 1753 #undef mix

Cache object: 218324125a13a5f7c519f89a3e3cb203


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