FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2001 Atsushi Onoe
      * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * IEEE 802.11 generic handler
     */
    #include "opt_wlan.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/socket.h>
    #include <sys/sbuf.h>
    
    #include <machine/stdarg.h>
    
    #include <net/if.h>
    #include <net/if_var.h>
    #include <net/if_dl.h>
    #include <net/if_media.h>
    #include <net/if_types.h>
    #include <net/ethernet.h>
    
    #include <net80211/ieee80211_var.h>
    #include <net80211/ieee80211_regdomain.h>
    #ifdef IEEE80211_SUPPORT_SUPERG
    #include <net80211/ieee80211_superg.h>
    #endif
    #include <net80211/ieee80211_ratectl.h>
    #include <net80211/ieee80211_vht.h>
    
    #include <net/bpf.h>
    
    const char *ieee80211_phymode_name[IEEE80211_MODE_MAX] = {
            [IEEE80211_MODE_AUTO]     = "auto",
            [IEEE80211_MODE_11A]      = "11a",
            [IEEE80211_MODE_11B]      = "11b",
            [IEEE80211_MODE_11G]      = "11g",
            [IEEE80211_MODE_FH]       = "FH",
            [IEEE80211_MODE_TURBO_A]  = "turboA",
            [IEEE80211_MODE_TURBO_G]  = "turboG",
            [IEEE80211_MODE_STURBO_A] = "sturboA",
            [IEEE80211_MODE_HALF]     = "half",
            [IEEE80211_MODE_QUARTER]  = "quarter",
            [IEEE80211_MODE_11NA]     = "11na",
            [IEEE80211_MODE_11NG]     = "11ng",
            [IEEE80211_MODE_VHT_2GHZ]         = "11acg",
            [IEEE80211_MODE_VHT_5GHZ]         = "11ac",
    };
    /* map ieee80211_opmode to the corresponding capability bit */
    const int ieee80211_opcap[IEEE80211_OPMODE_MAX] = {
            [IEEE80211_M_IBSS]      = IEEE80211_C_IBSS,
            [IEEE80211_M_WDS]       = IEEE80211_C_WDS,
            [IEEE80211_M_STA]       = IEEE80211_C_STA,
            [IEEE80211_M_AHDEMO]    = IEEE80211_C_AHDEMO,
            [IEEE80211_M_HOSTAP]    = IEEE80211_C_HOSTAP,
            [IEEE80211_M_MONITOR]   = IEEE80211_C_MONITOR,
    #ifdef IEEE80211_SUPPORT_MESH
            [IEEE80211_M_MBSS]      = IEEE80211_C_MBSS,
    #endif
    };
    
    const uint8_t ieee80211broadcastaddr[IEEE80211_ADDR_LEN] =
            { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
    
    static  void ieee80211_syncflag_locked(struct ieee80211com *ic, int flag);
    static  void ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag);
    static  void ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag);
    static  void ieee80211_syncflag_vht_locked(struct ieee80211com *ic, int flag);
    static  int ieee80211_media_setup(struct ieee80211com *ic,
                   struct ifmedia *media, int caps, int addsta,
                   ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
   static  int media_status(enum ieee80211_opmode,
                   const struct ieee80211_channel *);
   static uint64_t ieee80211_get_counter(struct ifnet *, ift_counter);
   
   MALLOC_DEFINE(M_80211_VAP, "80211vap", "802.11 vap state");
   
   /*
    * Default supported rates for 802.11 operation (in IEEE .5Mb units).
    */
   #define B(r)    ((r) | IEEE80211_RATE_BASIC)
   static const struct ieee80211_rateset ieee80211_rateset_11a =
           { 8, { B(12), 18, B(24), 36, B(48), 72, 96, 108 } };
   static const struct ieee80211_rateset ieee80211_rateset_half =
           { 8, { B(6), 9, B(12), 18, B(24), 36, 48, 54 } };
   static const struct ieee80211_rateset ieee80211_rateset_quarter =
           { 8, { B(3), 4, B(6), 9, B(12), 18, 24, 27 } };
   static const struct ieee80211_rateset ieee80211_rateset_11b =
           { 4, { B(2), B(4), B(11), B(22) } };
   /* NB: OFDM rates are handled specially based on mode */
   static const struct ieee80211_rateset ieee80211_rateset_11g =
           { 12, { B(2), B(4), B(11), B(22), 12, 18, 24, 36, 48, 72, 96, 108 } };
   #undef B
   
   static int set_vht_extchan(struct ieee80211_channel *c);
   
   /*
    * Fill in 802.11 available channel set, mark
    * all available channels as active, and pick
    * a default channel if not already specified.
    */
   void
   ieee80211_chan_init(struct ieee80211com *ic)
   {
   #define DEFAULTRATES(m, def) do { \
           if (ic->ic_sup_rates[m].rs_nrates == 0) \
                   ic->ic_sup_rates[m] = def; \
   } while (0)
           struct ieee80211_channel *c;
           int i;
   
           KASSERT(0 < ic->ic_nchans && ic->ic_nchans <= IEEE80211_CHAN_MAX,
                   ("invalid number of channels specified: %u", ic->ic_nchans));
           memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
           memset(ic->ic_modecaps, 0, sizeof(ic->ic_modecaps));
           setbit(ic->ic_modecaps, IEEE80211_MODE_AUTO);
           for (i = 0; i < ic->ic_nchans; i++) {
                   c = &ic->ic_channels[i];
                   KASSERT(c->ic_flags != 0, ("channel with no flags"));
                   /*
                    * Help drivers that work only with frequencies by filling
                    * in IEEE channel #'s if not already calculated.  Note this
                    * mimics similar work done in ieee80211_setregdomain when
                    * changing regulatory state.
                    */
                   if (c->ic_ieee == 0)
                           c->ic_ieee = ieee80211_mhz2ieee(c->ic_freq,c->ic_flags);
   
                   /*
                    * Setup the HT40/VHT40 upper/lower bits.
                    * The VHT80/... math is done elsewhere.
                    */
                   if (IEEE80211_IS_CHAN_HT40(c) && c->ic_extieee == 0)
                           c->ic_extieee = ieee80211_mhz2ieee(c->ic_freq +
                               (IEEE80211_IS_CHAN_HT40U(c) ? 20 : -20),
                               c->ic_flags);
   
                   /* Update VHT math */
                   /*
                    * XXX VHT again, note that this assumes VHT80/... channels
                    * are legit already.
                    */
                   set_vht_extchan(c);
   
                   /* default max tx power to max regulatory */
                   if (c->ic_maxpower == 0)
                           c->ic_maxpower = 2*c->ic_maxregpower;
                   setbit(ic->ic_chan_avail, c->ic_ieee);
                   /*
                    * Identify mode capabilities.
                    */
                   if (IEEE80211_IS_CHAN_A(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_11A);
                   if (IEEE80211_IS_CHAN_B(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_11B);
                   if (IEEE80211_IS_CHAN_ANYG(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_11G);
                   if (IEEE80211_IS_CHAN_FHSS(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_FH);
                   if (IEEE80211_IS_CHAN_108A(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_A);
                   if (IEEE80211_IS_CHAN_108G(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_TURBO_G);
                   if (IEEE80211_IS_CHAN_ST(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_STURBO_A);
                   if (IEEE80211_IS_CHAN_HALF(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_HALF);
                   if (IEEE80211_IS_CHAN_QUARTER(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_QUARTER);
                   if (IEEE80211_IS_CHAN_HTA(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_11NA);
                   if (IEEE80211_IS_CHAN_HTG(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_11NG);
                   if (IEEE80211_IS_CHAN_VHTA(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_VHT_5GHZ);
                   if (IEEE80211_IS_CHAN_VHTG(c))
                           setbit(ic->ic_modecaps, IEEE80211_MODE_VHT_2GHZ);
           }
           /* initialize candidate channels to all available */
           memcpy(ic->ic_chan_active, ic->ic_chan_avail,
                   sizeof(ic->ic_chan_avail));
   
           /* sort channel table to allow lookup optimizations */
           ieee80211_sort_channels(ic->ic_channels, ic->ic_nchans);
   
           /* invalidate any previous state */
           ic->ic_bsschan = IEEE80211_CHAN_ANYC;
           ic->ic_prevchan = NULL;
           ic->ic_csa_newchan = NULL;
           /* arbitrarily pick the first channel */
           ic->ic_curchan = &ic->ic_channels[0];
           ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
   
           /* fillin well-known rate sets if driver has not specified */
           DEFAULTRATES(IEEE80211_MODE_11B,         ieee80211_rateset_11b);
           DEFAULTRATES(IEEE80211_MODE_11G,         ieee80211_rateset_11g);
           DEFAULTRATES(IEEE80211_MODE_11A,         ieee80211_rateset_11a);
           DEFAULTRATES(IEEE80211_MODE_TURBO_A,     ieee80211_rateset_11a);
           DEFAULTRATES(IEEE80211_MODE_TURBO_G,     ieee80211_rateset_11g);
           DEFAULTRATES(IEEE80211_MODE_STURBO_A,    ieee80211_rateset_11a);
           DEFAULTRATES(IEEE80211_MODE_HALF,        ieee80211_rateset_half);
           DEFAULTRATES(IEEE80211_MODE_QUARTER,     ieee80211_rateset_quarter);
           DEFAULTRATES(IEEE80211_MODE_11NA,        ieee80211_rateset_11a);
           DEFAULTRATES(IEEE80211_MODE_11NG,        ieee80211_rateset_11g);
           DEFAULTRATES(IEEE80211_MODE_VHT_2GHZ,    ieee80211_rateset_11g);
           DEFAULTRATES(IEEE80211_MODE_VHT_5GHZ,    ieee80211_rateset_11a);
   
           /*
            * Setup required information to fill the mcsset field, if driver did
            * not. Assume a 2T2R setup for historic reasons.
            */
           if (ic->ic_rxstream == 0)
                   ic->ic_rxstream = 2;
           if (ic->ic_txstream == 0)
                   ic->ic_txstream = 2;
   
           ieee80211_init_suphtrates(ic);
   
           /*
            * Set auto mode to reset active channel state and any desired channel.
            */
           (void) ieee80211_setmode(ic, IEEE80211_MODE_AUTO);
   #undef DEFAULTRATES
   }
   
   static void
   null_update_mcast(struct ieee80211com *ic)
   {
   
           ic_printf(ic, "need multicast update callback\n");
   }
   
   static void
   null_update_promisc(struct ieee80211com *ic)
   {
   
           ic_printf(ic, "need promiscuous mode update callback\n");
   }
   
   static void
   null_update_chw(struct ieee80211com *ic)
   {
   
           ic_printf(ic, "%s: need callback\n", __func__);
   }
   
   int
   ic_printf(struct ieee80211com *ic, const char * fmt, ...)
   {
           va_list ap;
           int retval;
   
           retval = printf("%s: ", ic->ic_name);
           va_start(ap, fmt);
           retval += vprintf(fmt, ap);
           va_end(ap);
           return (retval);
   }
   
   static LIST_HEAD(, ieee80211com) ic_head = LIST_HEAD_INITIALIZER(ic_head);
   static struct mtx ic_list_mtx;
   MTX_SYSINIT(ic_list, &ic_list_mtx, "ieee80211com list", MTX_DEF);
   
   static int
   sysctl_ieee80211coms(SYSCTL_HANDLER_ARGS)
   {
           struct ieee80211com *ic;
           struct sbuf sb;
           char *sp;
           int error;
   
           error = sysctl_wire_old_buffer(req, 0);
           if (error)
                   return (error);
           sbuf_new_for_sysctl(&sb, NULL, 8, req);
           sbuf_clear_flags(&sb, SBUF_INCLUDENUL);
           sp = "";
           mtx_lock(&ic_list_mtx);
           LIST_FOREACH(ic, &ic_head, ic_next) {
                   sbuf_printf(&sb, "%s%s", sp, ic->ic_name);
                   sp = " ";
           }
           mtx_unlock(&ic_list_mtx);
           error = sbuf_finish(&sb);
           sbuf_delete(&sb);
           return (error);
   }
   
   SYSCTL_PROC(_net_wlan, OID_AUTO, devices,
       CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
       sysctl_ieee80211coms, "A", "names of available 802.11 devices");
   
   /*
    * Attach/setup the common net80211 state.  Called by
    * the driver on attach to prior to creating any vap's.
    */
   void
   ieee80211_ifattach(struct ieee80211com *ic)
   {
   
           IEEE80211_LOCK_INIT(ic, ic->ic_name);
           IEEE80211_TX_LOCK_INIT(ic, ic->ic_name);
           TAILQ_INIT(&ic->ic_vaps);
   
           /* Create a taskqueue for all state changes */
           ic->ic_tq = taskqueue_create("ic_taskq", M_WAITOK | M_ZERO,
               taskqueue_thread_enqueue, &ic->ic_tq);
           taskqueue_start_threads(&ic->ic_tq, 1, PI_NET, "%s net80211 taskq",
               ic->ic_name);
           ic->ic_ierrors = counter_u64_alloc(M_WAITOK);
           ic->ic_oerrors = counter_u64_alloc(M_WAITOK);
           /*
            * Fill in 802.11 available channel set, mark all
            * available channels as active, and pick a default
            * channel if not already specified.
            */
           ieee80211_chan_init(ic);
   
           ic->ic_update_mcast = null_update_mcast;
           ic->ic_update_promisc = null_update_promisc;
           ic->ic_update_chw = null_update_chw;
   
           ic->ic_hash_key = arc4random();
           ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
           ic->ic_lintval = ic->ic_bintval;
           ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
   
           ieee80211_crypto_attach(ic);
           ieee80211_node_attach(ic);
           ieee80211_power_attach(ic);
           ieee80211_proto_attach(ic);
   #ifdef IEEE80211_SUPPORT_SUPERG
           ieee80211_superg_attach(ic);
   #endif
           ieee80211_ht_attach(ic);
           ieee80211_vht_attach(ic);
           ieee80211_scan_attach(ic);
           ieee80211_regdomain_attach(ic);
           ieee80211_dfs_attach(ic);
   
           ieee80211_sysctl_attach(ic);
   
           mtx_lock(&ic_list_mtx);
           LIST_INSERT_HEAD(&ic_head, ic, ic_next);
           mtx_unlock(&ic_list_mtx);
   }
   
   /*
    * Detach net80211 state on device detach.  Tear down
    * all vap's and reclaim all common state prior to the
    * device state going away.  Note we may call back into
    * driver; it must be prepared for this.
    */
   void
   ieee80211_ifdetach(struct ieee80211com *ic)
   {
           struct ieee80211vap *vap;
   
           /*
            * We use this as an indicator that ifattach never had a chance to be
            * called, e.g. early driver attach failed and ifdetach was called
            * during subsequent detach.  Never fear, for we have nothing to do
            * here.
            */
           if (ic->ic_tq == NULL)
                   return;
   
           mtx_lock(&ic_list_mtx);
           LIST_REMOVE(ic, ic_next);
           mtx_unlock(&ic_list_mtx);
   
           taskqueue_drain(taskqueue_thread, &ic->ic_restart_task);
   
           /*
            * The VAP is responsible for setting and clearing
            * the VIMAGE context.
            */
           while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL) {
                   ieee80211_com_vdetach(vap);
                   ieee80211_vap_destroy(vap);
           }
           ieee80211_waitfor_parent(ic);
   
           ieee80211_sysctl_detach(ic);
           ieee80211_dfs_detach(ic);
           ieee80211_regdomain_detach(ic);
           ieee80211_scan_detach(ic);
   #ifdef IEEE80211_SUPPORT_SUPERG
           ieee80211_superg_detach(ic);
   #endif
           ieee80211_vht_detach(ic);
           ieee80211_ht_detach(ic);
           /* NB: must be called before ieee80211_node_detach */
           ieee80211_proto_detach(ic);
           ieee80211_crypto_detach(ic);
           ieee80211_power_detach(ic);
           ieee80211_node_detach(ic);
   
           counter_u64_free(ic->ic_ierrors);
           counter_u64_free(ic->ic_oerrors);
   
           taskqueue_free(ic->ic_tq);
           IEEE80211_TX_LOCK_DESTROY(ic);
           IEEE80211_LOCK_DESTROY(ic);
   }
   
   struct ieee80211com *
   ieee80211_find_com(const char *name)
   {
           struct ieee80211com *ic;
   
           mtx_lock(&ic_list_mtx);
           LIST_FOREACH(ic, &ic_head, ic_next)
                   if (strcmp(ic->ic_name, name) == 0)
                           break;
           mtx_unlock(&ic_list_mtx);
   
           return (ic);
   }
   
   void
   ieee80211_iterate_coms(ieee80211_com_iter_func *f, void *arg)
   {
           struct ieee80211com *ic;
   
           mtx_lock(&ic_list_mtx);
           LIST_FOREACH(ic, &ic_head, ic_next)
                   (*f)(arg, ic);
           mtx_unlock(&ic_list_mtx);
   }
   
   /*
    * Default reset method for use with the ioctl support.  This
    * method is invoked after any state change in the 802.11
    * layer that should be propagated to the hardware but not
    * require re-initialization of the 802.11 state machine (e.g
    * rescanning for an ap).  We always return ENETRESET which
    * should cause the driver to re-initialize the device. Drivers
    * can override this method to implement more optimized support.
    */
   static int
   default_reset(struct ieee80211vap *vap, u_long cmd)
   {
           return ENETRESET;
   }
   
   /*
    * Default for updating the VAP default TX key index.
    *
    * Drivers that support TX offload as well as hardware encryption offload
    * may need to be informed of key index changes separate from the key
    * update.
    */
   static void
   default_update_deftxkey(struct ieee80211vap *vap, ieee80211_keyix kid)
   {
   
           /* XXX assert validity */
           /* XXX assert we're in a key update block */
           vap->iv_def_txkey = kid;
   }
   
   /*
    * Add underlying device errors to vap errors.
    */
   static uint64_t
   ieee80211_get_counter(struct ifnet *ifp, ift_counter cnt)
   {
           struct ieee80211vap *vap = ifp->if_softc;
           struct ieee80211com *ic = vap->iv_ic;
           uint64_t rv;
   
           rv = if_get_counter_default(ifp, cnt);
           switch (cnt) {
           case IFCOUNTER_OERRORS:
                   rv += counter_u64_fetch(ic->ic_oerrors);
                   break;
           case IFCOUNTER_IERRORS:
                   rv += counter_u64_fetch(ic->ic_ierrors);
                   break;
           default:
                   break;
           }
   
           return (rv);
   }
   
   /*
    * Prepare a vap for use.  Drivers use this call to
    * setup net80211 state in new vap's prior attaching
    * them with ieee80211_vap_attach (below).
    */
   int
   ieee80211_vap_setup(struct ieee80211com *ic, struct ieee80211vap *vap,
       const char name[IFNAMSIZ], int unit, enum ieee80211_opmode opmode,
       int flags, const uint8_t bssid[IEEE80211_ADDR_LEN])
   {
           struct ifnet *ifp;
   
           ifp = if_alloc(IFT_ETHER);
           if (ifp == NULL) {
                   ic_printf(ic, "%s: unable to allocate ifnet\n", __func__);
                   return ENOMEM;
           }
           if_initname(ifp, name, unit);
           ifp->if_softc = vap;                    /* back pointer */
           ifp->if_flags = IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST;
           ifp->if_transmit = ieee80211_vap_transmit;
           ifp->if_qflush = ieee80211_vap_qflush;
           ifp->if_ioctl = ieee80211_ioctl;
           ifp->if_init = ieee80211_init;
           ifp->if_get_counter = ieee80211_get_counter;
   
           vap->iv_ifp = ifp;
           vap->iv_ic = ic;
           vap->iv_flags = ic->ic_flags;           /* propagate common flags */
           vap->iv_flags_ext = ic->ic_flags_ext;
           vap->iv_flags_ven = ic->ic_flags_ven;
           vap->iv_caps = ic->ic_caps &~ IEEE80211_C_OPMODE;
   
           /* 11n capabilities - XXX methodize */
           vap->iv_htcaps = ic->ic_htcaps;
           vap->iv_htextcaps = ic->ic_htextcaps;
   
           /* 11ac capabilities - XXX methodize */
           vap->iv_vhtcaps = ic->ic_vhtcaps;
           vap->iv_vhtextcaps = ic->ic_vhtextcaps;
   
           vap->iv_opmode = opmode;
           vap->iv_caps |= ieee80211_opcap[opmode];
           IEEE80211_ADDR_COPY(vap->iv_myaddr, ic->ic_macaddr);
           switch (opmode) {
           case IEEE80211_M_WDS:
                   /*
                    * WDS links must specify the bssid of the far end.
                    * For legacy operation this is a static relationship.
                    * For non-legacy operation the station must associate
                    * and be authorized to pass traffic.  Plumbing the
                    * vap to the proper node happens when the vap
                    * transitions to RUN state.
                    */
                   IEEE80211_ADDR_COPY(vap->iv_des_bssid, bssid);
                   vap->iv_flags |= IEEE80211_F_DESBSSID;
                   if (flags & IEEE80211_CLONE_WDSLEGACY)
                           vap->iv_flags_ext |= IEEE80211_FEXT_WDSLEGACY;
                   break;
   #ifdef IEEE80211_SUPPORT_TDMA
           case IEEE80211_M_AHDEMO:
                   if (flags & IEEE80211_CLONE_TDMA) {
                           /* NB: checked before clone operation allowed */
                           KASSERT(ic->ic_caps & IEEE80211_C_TDMA,
                               ("not TDMA capable, ic_caps 0x%x", ic->ic_caps));
                           /*
                            * Propagate TDMA capability to mark vap; this
                            * cannot be removed and is used to distinguish
                            * regular ahdemo operation from ahdemo+tdma.
                            */
                           vap->iv_caps |= IEEE80211_C_TDMA;
                   }
                   break;
   #endif
           default:
                   break;
           }
           /* auto-enable s/w beacon miss support */
           if (flags & IEEE80211_CLONE_NOBEACONS)
                   vap->iv_flags_ext |= IEEE80211_FEXT_SWBMISS;
           /* auto-generated or user supplied MAC address */
           if (flags & (IEEE80211_CLONE_BSSID|IEEE80211_CLONE_MACADDR))
                   vap->iv_flags_ext |= IEEE80211_FEXT_UNIQMAC;
           /*
            * Enable various functionality by default if we're
            * capable; the driver can override us if it knows better.
            */
           if (vap->iv_caps & IEEE80211_C_WME)
                   vap->iv_flags |= IEEE80211_F_WME;
           if (vap->iv_caps & IEEE80211_C_BURST)
                   vap->iv_flags |= IEEE80211_F_BURST;
           /* NB: bg scanning only makes sense for station mode right now */
           if (vap->iv_opmode == IEEE80211_M_STA &&
               (vap->iv_caps & IEEE80211_C_BGSCAN))
                   vap->iv_flags |= IEEE80211_F_BGSCAN;
           vap->iv_flags |= IEEE80211_F_DOTH;      /* XXX no cap, just ena */
           /* NB: DFS support only makes sense for ap mode right now */
           if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
               (vap->iv_caps & IEEE80211_C_DFS))
                   vap->iv_flags_ext |= IEEE80211_FEXT_DFS;
           /* NB: only flip on U-APSD for hostap/sta for now */
           if ((vap->iv_opmode == IEEE80211_M_STA)
               || (vap->iv_opmode == IEEE80211_M_HOSTAP)) {
                   if (vap->iv_caps & IEEE80211_C_UAPSD)
                           vap->iv_flags_ext |= IEEE80211_FEXT_UAPSD;
           }
   
           vap->iv_des_chan = IEEE80211_CHAN_ANYC;         /* any channel is ok */
           vap->iv_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;
           vap->iv_dtim_period = IEEE80211_DTIM_DEFAULT;
           /*
            * Install a default reset method for the ioctl support;
            * the driver can override this.
            */
           vap->iv_reset = default_reset;
   
           /*
            * Install a default crypto key update method, the driver
            * can override this.
            */
           vap->iv_update_deftxkey = default_update_deftxkey;
   
           ieee80211_sysctl_vattach(vap);
           ieee80211_crypto_vattach(vap);
           ieee80211_node_vattach(vap);
           ieee80211_power_vattach(vap);
           ieee80211_proto_vattach(vap);
   #ifdef IEEE80211_SUPPORT_SUPERG
           ieee80211_superg_vattach(vap);
   #endif
           ieee80211_ht_vattach(vap);
           ieee80211_vht_vattach(vap);
           ieee80211_scan_vattach(vap);
           ieee80211_regdomain_vattach(vap);
           ieee80211_radiotap_vattach(vap);
           ieee80211_vap_reset_erp(vap);
           ieee80211_ratectl_set(vap, IEEE80211_RATECTL_NONE);
   
           return 0;
   }
   
   /*
    * Activate a vap.  State should have been prepared with a
    * call to ieee80211_vap_setup and by the driver.  On return
    * from this call the vap is ready for use.
    */
   int
   ieee80211_vap_attach(struct ieee80211vap *vap, ifm_change_cb_t media_change,
       ifm_stat_cb_t media_stat, const uint8_t macaddr[IEEE80211_ADDR_LEN])
   {
           struct ifnet *ifp = vap->iv_ifp;
           struct ieee80211com *ic = vap->iv_ic;
           struct ifmediareq imr;
           int maxrate;
   
           IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
               "%s: %s parent %s flags 0x%x flags_ext 0x%x\n",
               __func__, ieee80211_opmode_name[vap->iv_opmode],
               ic->ic_name, vap->iv_flags, vap->iv_flags_ext);
   
           /*
            * Do late attach work that cannot happen until after
            * the driver has had a chance to override defaults.
            */
           ieee80211_node_latevattach(vap);
           ieee80211_power_latevattach(vap);
   
           maxrate = ieee80211_media_setup(ic, &vap->iv_media, vap->iv_caps,
               vap->iv_opmode == IEEE80211_M_STA, media_change, media_stat);
           ieee80211_media_status(ifp, &imr);
           /* NB: strip explicit mode; we're actually in autoselect */
           ifmedia_set(&vap->iv_media,
               imr.ifm_active &~ (IFM_MMASK | IFM_IEEE80211_TURBO));
           if (maxrate)
                   ifp->if_baudrate = IF_Mbps(maxrate);
   
           ether_ifattach(ifp, macaddr);
           IEEE80211_ADDR_COPY(vap->iv_myaddr, IF_LLADDR(ifp));
           /* hook output method setup by ether_ifattach */
           vap->iv_output = ifp->if_output;
           ifp->if_output = ieee80211_output;
           /* NB: if_mtu set by ether_ifattach to ETHERMTU */
   
           IEEE80211_LOCK(ic);
           TAILQ_INSERT_TAIL(&ic->ic_vaps, vap, iv_next);
           ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
   #ifdef IEEE80211_SUPPORT_SUPERG
           ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
   #endif
           ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
           ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
           ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
           ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
   
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_VHT);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT40);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT80);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT160);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT80P80);
           IEEE80211_UNLOCK(ic);
   
           return 1;
   }
   
   /*
    * Tear down vap state and reclaim the ifnet.
    * The driver is assumed to have prepared for
    * this; e.g. by turning off interrupts for the
    * underlying device.
    */
   void
   ieee80211_vap_detach(struct ieee80211vap *vap)
   {
           struct ieee80211com *ic = vap->iv_ic;
           struct ifnet *ifp = vap->iv_ifp;
   
           CURVNET_SET(ifp->if_vnet);
   
           IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
               __func__, ieee80211_opmode_name[vap->iv_opmode], ic->ic_name);
   
           /* NB: bpfdetach is called by ether_ifdetach and claims all taps */
           ether_ifdetach(ifp);
   
           ieee80211_stop(vap);
   
           /*
            * Flush any deferred vap tasks.
            */
           ieee80211_draintask(ic, &vap->iv_nstate_task);
           ieee80211_draintask(ic, &vap->iv_swbmiss_task);
           ieee80211_draintask(ic, &vap->iv_wme_task);
           ieee80211_draintask(ic, &ic->ic_parent_task);
   
           /* XXX band-aid until ifnet handles this for us */
           taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
   
           IEEE80211_LOCK(ic);
           KASSERT(vap->iv_state == IEEE80211_S_INIT , ("vap still running"));
           TAILQ_REMOVE(&ic->ic_vaps, vap, iv_next);
           ieee80211_syncflag_locked(ic, IEEE80211_F_WME);
   #ifdef IEEE80211_SUPPORT_SUPERG
           ieee80211_syncflag_locked(ic, IEEE80211_F_TURBOP);
   #endif
           ieee80211_syncflag_locked(ic, IEEE80211_F_PCF);
           ieee80211_syncflag_locked(ic, IEEE80211_F_BURST);
           ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_HT);
           ieee80211_syncflag_ht_locked(ic, IEEE80211_FHT_USEHT40);
   
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_VHT);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT40);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT80);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT160);
           ieee80211_syncflag_vht_locked(ic, IEEE80211_FVHT_USEVHT80P80);
   
           /* NB: this handles the bpfdetach done below */
           ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
           if (vap->iv_ifflags & IFF_PROMISC)
                   ieee80211_promisc(vap, false);
           if (vap->iv_ifflags & IFF_ALLMULTI)
                   ieee80211_allmulti(vap, false);
           IEEE80211_UNLOCK(ic);
   
           ifmedia_removeall(&vap->iv_media);
   
           ieee80211_radiotap_vdetach(vap);
           ieee80211_regdomain_vdetach(vap);
           ieee80211_scan_vdetach(vap);
   #ifdef IEEE80211_SUPPORT_SUPERG
           ieee80211_superg_vdetach(vap);
   #endif
           ieee80211_vht_vdetach(vap);
           ieee80211_ht_vdetach(vap);
           /* NB: must be before ieee80211_node_vdetach */
           ieee80211_proto_vdetach(vap);
           ieee80211_crypto_vdetach(vap);
           ieee80211_power_vdetach(vap);
           ieee80211_node_vdetach(vap);
           ieee80211_sysctl_vdetach(vap);
   
           if_free(ifp);
   
           CURVNET_RESTORE();
   }
   
   /*
    * Count number of vaps in promisc, and issue promisc on
    * parent respectively.
    */
   void
   ieee80211_promisc(struct ieee80211vap *vap, bool on)
   {
           struct ieee80211com *ic = vap->iv_ic;
   
           IEEE80211_LOCK_ASSERT(ic);
   
           if (on) {
                   if (++ic->ic_promisc == 1)
                           ieee80211_runtask(ic, &ic->ic_promisc_task);
           } else {
                   KASSERT(ic->ic_promisc > 0, ("%s: ic %p not promisc",
                       __func__, ic));
                   if (--ic->ic_promisc == 0)
                           ieee80211_runtask(ic, &ic->ic_promisc_task);
           }
   }
   
   /*
    * Count number of vaps in allmulti, and issue allmulti on
    * parent respectively.
    */
   void
   ieee80211_allmulti(struct ieee80211vap *vap, bool on)
   {
           struct ieee80211com *ic = vap->iv_ic;
   
           IEEE80211_LOCK_ASSERT(ic);
   
           if (on) {
                   if (++ic->ic_allmulti == 1)
                           ieee80211_runtask(ic, &ic->ic_mcast_task);
           } else {
                   KASSERT(ic->ic_allmulti > 0, ("%s: ic %p not allmulti",
                       __func__, ic));
                   if (--ic->ic_allmulti == 0)
                           ieee80211_runtask(ic, &ic->ic_mcast_task);
           }
   }
   
   /*
    * Synchronize flag bit state in the com structure
    * according to the state of all vap's.  This is used,
    * for example, to handle state changes via ioctls.
    */
   static void
   ieee80211_syncflag_locked(struct ieee80211com *ic, int flag)
   {
           struct ieee80211vap *vap;
           int bit;
   
           IEEE80211_LOCK_ASSERT(ic);
   
           bit = 0;
           TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                   if (vap->iv_flags & flag) {
                           bit = 1;
                           break;
                   }
           if (bit)
                   ic->ic_flags |= flag;
           else
                   ic->ic_flags &= ~flag;
   }
   
   void
   ieee80211_syncflag(struct ieee80211vap *vap, int flag)
   {
           struct ieee80211com *ic = vap->iv_ic;
   
           IEEE80211_LOCK(ic);
           if (flag < 0) {
                   flag = -flag;
                   vap->iv_flags &= ~flag;
           } else
                   vap->iv_flags |= flag;
           ieee80211_syncflag_locked(ic, flag);
           IEEE80211_UNLOCK(ic);
   }
   
   /*
    * Synchronize flags_ht bit state in the com structure
    * according to the state of all vap's.  This is used,
    * for example, to handle state changes via ioctls.
    */
   static void
   ieee80211_syncflag_ht_locked(struct ieee80211com *ic, int flag)
   {
           struct ieee80211vap *vap;
           int bit;
   
           IEEE80211_LOCK_ASSERT(ic);
   
           bit = 0;
           TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                   if (vap->iv_flags_ht & flag) {
                           bit = 1;
                           break;
                   }
           if (bit)
                   ic->ic_flags_ht |= flag;
           else
                   ic->ic_flags_ht &= ~flag;
   }
   
   void
   ieee80211_syncflag_ht(struct ieee80211vap *vap, int flag)
   {
           struct ieee80211com *ic = vap->iv_ic;
   
           IEEE80211_LOCK(ic);
           if (flag < 0) {
                   flag = -flag;
                   vap->iv_flags_ht &= ~flag;
           } else
                   vap->iv_flags_ht |= flag;
           ieee80211_syncflag_ht_locked(ic, flag);
           IEEE80211_UNLOCK(ic);
   }
   
   /*
    * Synchronize flags_vht bit state in the com structure
    * according to the state of all vap's.  This is used,
    * for example, to handle state changes via ioctls.
    */
   static void
   ieee80211_syncflag_vht_locked(struct ieee80211com *ic, int flag)
   {
           struct ieee80211vap *vap;
           int bit;
   
           IEEE80211_LOCK_ASSERT(ic);
   
           bit = 0;
           TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                   if (vap->iv_flags_vht & flag) {
                           bit = 1;
                           break;
                   }
           if (bit)
                   ic->ic_flags_vht |= flag;
           else
                   ic->ic_flags_vht &= ~flag;
   }
   
   void
   ieee80211_syncflag_vht(struct ieee80211vap *vap, int flag)
   {
           struct ieee80211com *ic = vap->iv_ic;
   
           IEEE80211_LOCK(ic);
           if (flag < 0) {
                   flag = -flag;
                   vap->iv_flags_vht &= ~flag;
           } else
                   vap->iv_flags_vht |= flag;
           ieee80211_syncflag_vht_locked(ic, flag);
           IEEE80211_UNLOCK(ic);
   }
   
   /*
    * Synchronize flags_ext bit state in the com structure
    * according to the state of all vap's.  This is used,
    * for example, to handle state changes via ioctls.
    */
   static void
   ieee80211_syncflag_ext_locked(struct ieee80211com *ic, int flag)
   {
           struct ieee80211vap *vap;
           int bit;
   
           IEEE80211_LOCK_ASSERT(ic);
   
           bit = 0;
           TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                   if (vap->iv_flags_ext & flag) {
                           bit = 1;
                           break;
                   }
           if (bit)
                   ic->ic_flags_ext |= flag;
           else
                   ic->ic_flags_ext &= ~flag;
   }
   
   void
   ieee80211_syncflag_ext(struct ieee80211vap *vap, int flag)
   {
           struct ieee80211com *ic = vap->iv_ic;
   
           IEEE80211_LOCK(ic);
           if (flag < 0) {
                   flag = -flag;
                  vap->iv_flags_ext &= ~flag;
          } else
                  vap->iv_flags_ext |= flag;
          ieee80211_syncflag_ext_locked(ic, flag);
          IEEE80211_UNLOCK(ic);
  }
  
  static __inline int
  mapgsm(u_int freq, u_int flags)
  {
          freq *= 10;
          if (flags & IEEE80211_CHAN_QUARTER)
                  freq += 5;
          else if (flags & IEEE80211_CHAN_HALF)
                  freq += 10;
          else
                  freq += 20;
          /* NB: there is no 907/20 wide but leave room */
          return (freq - 906*10) / 5;
  }
  
  static __inline int
  mappsb(u_int freq, u_int flags)
  {
          return 37 + ((freq * 10) + ((freq % 5) == 2 ? 5 : 0) - 49400) / 5;
  }
  
  /*
   * Convert MHz frequency to IEEE channel number.
   */
  int
  ieee80211_mhz2ieee(u_int freq, u_int flags)
  {
  #define IS_FREQ_IN_PSB(_freq) ((_freq) > 4940 && (_freq) < 4990)
          if (flags & IEEE80211_CHAN_GSM)
                  return mapgsm(freq, flags);
          if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
                  if (freq == 2484)
                          return 14;
                  if (freq < 2484)
                          return ((int) freq - 2407) / 5;
                  else
                          return 15 + ((freq - 2512) / 20);
          } else if (flags & IEEE80211_CHAN_5GHZ) {       /* 5Ghz band */
                  if (freq <= 5000) {
                          /* XXX check regdomain? */
                          if (IS_FREQ_IN_PSB(freq))
                                  return mappsb(freq, flags);
                          return (freq - 4000) / 5;
                  } else
                          return (freq - 5000) / 5;
          } else {                                /* either, guess */
                  if (freq == 2484)
                          return 14;
                  if (freq < 2484) {
                          if (907 <= freq && freq <= 922)
                                  return mapgsm(freq, flags);
                          return ((int) freq - 2407) / 5;
                  }
                  if (freq < 5000) {
                          if (IS_FREQ_IN_PSB(freq))
                                  return mappsb(freq, flags);
                          else if (freq > 4900)
                                  return (freq - 4000) / 5;
                          else
                                  return 15 + ((freq - 2512) / 20);
                  }
                  return (freq - 5000) / 5;
          }
  #undef IS_FREQ_IN_PSB
  }
  
  /*
   * Convert channel to IEEE channel number.
   */
  int
  ieee80211_chan2ieee(struct ieee80211com *ic, const struct ieee80211_channel *c)
  {
          if (c == NULL) {
                  ic_printf(ic, "invalid channel (NULL)\n");
                  return 0;               /* XXX */
          }
          return (c == IEEE80211_CHAN_ANYC ?  IEEE80211_CHAN_ANY : c->ic_ieee);
  }
  
  /*
   * Convert IEEE channel number to MHz frequency.
   */
  u_int
  ieee80211_ieee2mhz(u_int chan, u_int flags)
  {
          if (flags & IEEE80211_CHAN_GSM)
                  return 907 + 5 * (chan / 10);
          if (flags & IEEE80211_CHAN_2GHZ) {      /* 2GHz band */
                  if (chan == 14)
                          return 2484;
                  if (chan < 14)
                          return 2407 + chan*5;
                  else
                          return 2512 + ((chan-15)*20);
          } else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
                  if (flags & (IEEE80211_CHAN_HALF|IEEE80211_CHAN_QUARTER)) {
                          chan -= 37;
                          return 4940 + chan*5 + (chan % 5 ? 2 : 0);
                  }
                  return 5000 + (chan*5);
          } else {                                /* either, guess */
                  /* XXX can't distinguish PSB+GSM channels */
                  if (chan == 14)
                          return 2484;
                  if (chan < 14)                  /* 0-13 */
                          return 2407 + chan*5;
                  if (chan < 27)                  /* 15-26 */
                          return 2512 + ((chan-15)*20);
                  return 5000 + (chan*5);
          }
  }
  
  static __inline void
  set_extchan(struct ieee80211_channel *c)
  {
  
          /*
           * IEEE Std 802.11-2012, page 1738, subclause 20.3.15.4:
           * "the secondary channel number shall be 'N + [1,-1] * 4'
           */
          if (c->ic_flags & IEEE80211_CHAN_HT40U)
                  c->ic_extieee = c->ic_ieee + 4;
          else if (c->ic_flags & IEEE80211_CHAN_HT40D)
                  c->ic_extieee = c->ic_ieee - 4;
          else
                  c->ic_extieee = 0;
  }
  
  /*
   * Populate the freq1/freq2 fields as appropriate for VHT channels.
   *
   * This for now uses a hard-coded list of 80MHz wide channels.
   *
   * For HT20/HT40, freq1 just is the centre frequency of the 40MHz
   * wide channel we've already decided upon.
   *
   * For VHT80 and VHT160, there are only a small number of fixed
   * 80/160MHz wide channels, so we just use those.
   *
   * This is all likely very very wrong - both the regulatory code
   * and this code needs to ensure that all four channels are
   * available and valid before the VHT80 (and eight for VHT160) channel
   * is created.
   */
  
  struct vht_chan_range {
          uint16_t freq_start;
          uint16_t freq_end;
  };
  
  struct vht_chan_range vht80_chan_ranges[] = {
          { 5170, 5250 },
          { 5250, 5330 },
          { 5490, 5570 },
          { 5570, 5650 },
          { 5650, 5730 },
          { 5735, 5815 },
          { 0, 0 }
  };
  
  struct vht_chan_range vht160_chan_ranges[] = {
          { 5170, 5330 },
          { 5490, 5650 },
          { 0, 0 }
  };
  
  static int
  set_vht_extchan(struct ieee80211_channel *c)
  {
          int i;
  
          if (! IEEE80211_IS_CHAN_VHT(c))
                  return (0);
  
          if (IEEE80211_IS_CHAN_VHT80P80(c)) {
                  printf("%s: TODO VHT80+80 channel (ieee=%d, flags=0x%08x)\n",
                      __func__, c->ic_ieee, c->ic_flags);
          }
  
          if (IEEE80211_IS_CHAN_VHT160(c)) {
                  for (i = 0; vht160_chan_ranges[i].freq_start != 0; i++) {
                          if (c->ic_freq >= vht160_chan_ranges[i].freq_start &&
                              c->ic_freq < vht160_chan_ranges[i].freq_end) {
                                  int midpoint;
  
                                  midpoint = vht160_chan_ranges[i].freq_start + 80;
                                  c->ic_vht_ch_freq1 =
                                      ieee80211_mhz2ieee(midpoint, c->ic_flags);
                                  c->ic_vht_ch_freq2 = 0;
  #if 0
                                  printf("%s: %d, freq=%d, midpoint=%d, freq1=%d, freq2=%d\n",
                                      __func__, c->ic_ieee, c->ic_freq, midpoint,
                                      c->ic_vht_ch_freq1, c->ic_vht_ch_freq2);
  #endif
                                  return (1);
                          }
                  }
                  return (0);
          }
  
          if (IEEE80211_IS_CHAN_VHT80(c)) {
                  for (i = 0; vht80_chan_ranges[i].freq_start != 0; i++) {
                          if (c->ic_freq >= vht80_chan_ranges[i].freq_start &&
                              c->ic_freq < vht80_chan_ranges[i].freq_end) {
                                  int midpoint;
  
                                  midpoint = vht80_chan_ranges[i].freq_start + 40;
                                  c->ic_vht_ch_freq1 =
                                      ieee80211_mhz2ieee(midpoint, c->ic_flags);
                                  c->ic_vht_ch_freq2 = 0;
  #if 0
                                  printf("%s: %d, freq=%d, midpoint=%d, freq1=%d, freq2=%d\n",
                                      __func__, c->ic_ieee, c->ic_freq, midpoint,
                                      c->ic_vht_ch_freq1, c->ic_vht_ch_freq2);
  #endif
                                  return (1);
                          }
                  }
                  return (0);
          }
  
          if (IEEE80211_IS_CHAN_VHT40(c)) {
                  if (IEEE80211_IS_CHAN_HT40U(c))
                          c->ic_vht_ch_freq1 = c->ic_ieee + 2;
                  else if (IEEE80211_IS_CHAN_HT40D(c))
                          c->ic_vht_ch_freq1 = c->ic_ieee - 2;
                  else
                          return (0);
                  return (1);
          }
  
          if (IEEE80211_IS_CHAN_VHT20(c)) {
                  c->ic_vht_ch_freq1 = c->ic_ieee;
                  return (1);
          }
  
          printf("%s: unknown VHT channel type (ieee=%d, flags=0x%08x)\n",
              __func__, c->ic_ieee, c->ic_flags);
  
          return (0);
  }
  
  /*
   * Return whether the current channel could possibly be a part of
   * a VHT80/VHT160 channel.
   *
   * This doesn't check that the whole range is in the allowed list
   * according to regulatory.
   */
  static bool
  is_vht160_valid_freq(uint16_t freq)
  {
          int i;
  
          for (i = 0; vht160_chan_ranges[i].freq_start != 0; i++) {
                  if (freq >= vht160_chan_ranges[i].freq_start &&
                      freq < vht160_chan_ranges[i].freq_end)
                          return (true);
          }
          return (false);
  }
  
  static int
  is_vht80_valid_freq(uint16_t freq)
  {
          int i;
          for (i = 0; vht80_chan_ranges[i].freq_start != 0; i++) {
                  if (freq >= vht80_chan_ranges[i].freq_start &&
                      freq < vht80_chan_ranges[i].freq_end)
                          return (1);
          }
          return (0);
  }
  
  static int
  addchan(struct ieee80211_channel chans[], int maxchans, int *nchans,
      uint8_t ieee, uint16_t freq, int8_t maxregpower, uint32_t flags)
  {
          struct ieee80211_channel *c;
  
          if (*nchans >= maxchans)
                  return (ENOBUFS);
  
  #if 0
          printf("%s: %d: ieee=%d, freq=%d, flags=0x%08x\n",
              __func__, *nchans, ieee, freq, flags);
  #endif
  
          c = &chans[(*nchans)++];
          c->ic_ieee = ieee;
          c->ic_freq = freq != 0 ? freq : ieee80211_ieee2mhz(ieee, flags);
          c->ic_maxregpower = maxregpower;
          c->ic_maxpower = 2 * maxregpower;
          c->ic_flags = flags;
          c->ic_vht_ch_freq1 = 0;
          c->ic_vht_ch_freq2 = 0;
          set_extchan(c);
          set_vht_extchan(c);
  
          return (0);
  }
  
  static int
  copychan_prev(struct ieee80211_channel chans[], int maxchans, int *nchans,
      uint32_t flags)
  {
          struct ieee80211_channel *c;
  
          KASSERT(*nchans > 0, ("channel list is empty\n"));
  
          if (*nchans >= maxchans)
                  return (ENOBUFS);
  
  #if 0
          printf("%s: %d: flags=0x%08x\n",
              __func__, *nchans, flags);
  #endif
  
          c = &chans[(*nchans)++];
          c[0] = c[-1];
          c->ic_flags = flags;
          c->ic_vht_ch_freq1 = 0;
          c->ic_vht_ch_freq2 = 0;
          set_extchan(c);
          set_vht_extchan(c);
  
          return (0);
  }
  
  /*
   * XXX VHT-2GHz
   */
  static void
  getflags_2ghz(const uint8_t bands[], uint32_t flags[], int cbw_flags)
  {
          int nmodes;
  
          nmodes = 0;
          if (isset(bands, IEEE80211_MODE_11B))
                  flags[nmodes++] = IEEE80211_CHAN_B;
          if (isset(bands, IEEE80211_MODE_11G))
                  flags[nmodes++] = IEEE80211_CHAN_G;
          if (isset(bands, IEEE80211_MODE_11NG))
                  flags[nmodes++] = IEEE80211_CHAN_G | IEEE80211_CHAN_HT20;
          if (cbw_flags & NET80211_CBW_FLAG_HT40) {
                  flags[nmodes++] = IEEE80211_CHAN_G | IEEE80211_CHAN_HT40U;
                  flags[nmodes++] = IEEE80211_CHAN_G | IEEE80211_CHAN_HT40D;
          }
          flags[nmodes] = 0;
  }
  
  static void
  getflags_5ghz(const uint8_t bands[], uint32_t flags[], int cbw_flags)
  {
          int nmodes;
  
          /*
           * The addchan_list() function seems to expect the flags array to
           * be in channel width order, so the VHT bits are interspersed
           * as appropriate to maintain said order.
           *
           * It also assumes HT40U is before HT40D.
           */
          nmodes = 0;
  
          /* 20MHz */
          if (isset(bands, IEEE80211_MODE_11A))
                  flags[nmodes++] = IEEE80211_CHAN_A;
          if (isset(bands, IEEE80211_MODE_11NA))
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT20;
          if (isset(bands, IEEE80211_MODE_VHT_5GHZ)) {
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT20 |
                      IEEE80211_CHAN_VHT20;
          }
  
          /* 40MHz */
          if (cbw_flags & NET80211_CBW_FLAG_HT40)
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U;
          if ((cbw_flags & NET80211_CBW_FLAG_HT40) &&
              isset(bands, IEEE80211_MODE_VHT_5GHZ))
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U |
                      IEEE80211_CHAN_VHT40U;
          if (cbw_flags & NET80211_CBW_FLAG_HT40)
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D;
          if ((cbw_flags & NET80211_CBW_FLAG_HT40) &&
              isset(bands, IEEE80211_MODE_VHT_5GHZ))
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D |
                      IEEE80211_CHAN_VHT40D;
  
          /* 80MHz */
          if ((cbw_flags & NET80211_CBW_FLAG_VHT80) &&
              isset(bands, IEEE80211_MODE_VHT_5GHZ)) {
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U |
                      IEEE80211_CHAN_VHT80;
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D |
                      IEEE80211_CHAN_VHT80;
          }
  
          /* VHT160 */
          if ((cbw_flags & NET80211_CBW_FLAG_VHT160) &&
              isset(bands, IEEE80211_MODE_VHT_5GHZ)) {
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U |
                      IEEE80211_CHAN_VHT160;
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D |
                      IEEE80211_CHAN_VHT160;
          }
  
          /* VHT80+80 */
          if ((cbw_flags & NET80211_CBW_FLAG_VHT80P80) &&
              isset(bands, IEEE80211_MODE_VHT_5GHZ)) {
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40U |
                      IEEE80211_CHAN_VHT80P80;
                  flags[nmodes++] = IEEE80211_CHAN_A | IEEE80211_CHAN_HT40D |
                      IEEE80211_CHAN_VHT80P80;
          }
  
          flags[nmodes] = 0;
  }
  
  static void
  getflags(const uint8_t bands[], uint32_t flags[], int cbw_flags)
  {
  
          flags[0] = 0;
          if (isset(bands, IEEE80211_MODE_11A) ||
              isset(bands, IEEE80211_MODE_11NA) ||
              isset(bands, IEEE80211_MODE_VHT_5GHZ)) {
                  if (isset(bands, IEEE80211_MODE_11B) ||
                      isset(bands, IEEE80211_MODE_11G) ||
                      isset(bands, IEEE80211_MODE_11NG) ||
                      isset(bands, IEEE80211_MODE_VHT_2GHZ))
                          return;
  
                  getflags_5ghz(bands, flags, cbw_flags);
          } else
                  getflags_2ghz(bands, flags, cbw_flags);
  }
  
  /*
   * Add one 20 MHz channel into specified channel list.
   * You MUST NOT mix bands when calling this.  It will not add 5ghz
   * channels if you have any B/G/N band bit set.
   * The _cbw() variant does also support HT40/VHT80/160/80+80.
   */
  int
  ieee80211_add_channel_cbw(struct ieee80211_channel chans[], int maxchans,
      int *nchans, uint8_t ieee, uint16_t freq, int8_t maxregpower,
      uint32_t chan_flags, const uint8_t bands[], int cbw_flags)
  {
          uint32_t flags[IEEE80211_MODE_MAX];
          int i, error;
  
          getflags(bands, flags, cbw_flags);
          KASSERT(flags[0] != 0, ("%s: no correct mode provided\n", __func__));
  
          error = addchan(chans, maxchans, nchans, ieee, freq, maxregpower,
              flags[0] | chan_flags);
          for (i = 1; flags[i] != 0 && error == 0; i++) {
                  error = copychan_prev(chans, maxchans, nchans,
                      flags[i] | chan_flags);
          }
  
          return (error);
  }
  
  int
  ieee80211_add_channel(struct ieee80211_channel chans[], int maxchans,
      int *nchans, uint8_t ieee, uint16_t freq, int8_t maxregpower,
      uint32_t chan_flags, const uint8_t bands[])
  {
  
          return (ieee80211_add_channel_cbw(chans, maxchans, nchans, ieee, freq,
              maxregpower, chan_flags, bands, 0));
  }
  
  static struct ieee80211_channel *
  findchannel(struct ieee80211_channel chans[], int nchans, uint16_t freq,
      uint32_t flags)
  {
          struct ieee80211_channel *c;
          int i;
  
          flags &= IEEE80211_CHAN_ALLTURBO;
          /* brute force search */
          for (i = 0; i < nchans; i++) {
                  c = &chans[i];
                  if (c->ic_freq == freq &&
                      (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
                          return c;
          }
          return NULL;
  }
  
  /*
   * Add 40 MHz channel pair into specified channel list.
   */
  /* XXX VHT */
  int
  ieee80211_add_channel_ht40(struct ieee80211_channel chans[], int maxchans,
      int *nchans, uint8_t ieee, int8_t maxregpower, uint32_t flags)
  {
          struct ieee80211_channel *cent, *extc;
          uint16_t freq;
          int error;
  
          freq = ieee80211_ieee2mhz(ieee, flags);
  
          /*
           * Each entry defines an HT40 channel pair; find the
           * center channel, then the extension channel above.
           */
          flags |= IEEE80211_CHAN_HT20;
          cent = findchannel(chans, *nchans, freq, flags);
          if (cent == NULL)
                  return (EINVAL);
  
          extc = findchannel(chans, *nchans, freq + 20, flags);
          if (extc == NULL)
                  return (ENOENT);
  
          flags &= ~IEEE80211_CHAN_HT;
          error = addchan(chans, maxchans, nchans, cent->ic_ieee, cent->ic_freq,
              maxregpower, flags | IEEE80211_CHAN_HT40U);
          if (error != 0)
                  return (error);
  
          error = addchan(chans, maxchans, nchans, extc->ic_ieee, extc->ic_freq,
              maxregpower, flags | IEEE80211_CHAN_HT40D);
  
          return (error);
  }
  
  /*
   * Fetch the center frequency for the primary channel.
   */
  uint32_t
  ieee80211_get_channel_center_freq(const struct ieee80211_channel *c)
  {
  
          return (c->ic_freq);
  }
  
  /*
   * Fetch the center frequency for the primary BAND channel.
   *
   * For 5, 10, 20MHz channels it'll be the normally configured channel
   * frequency.
   *
   * For 40MHz, 80MHz, 160MHz channels it will be the centre of the
   * wide channel, not the centre of the primary channel (that's ic_freq).
   *
   * For 80+80MHz channels this will be the centre of the primary
   * 80MHz channel; the secondary 80MHz channel will be center_freq2().
   */
  uint32_t
  ieee80211_get_channel_center_freq1(const struct ieee80211_channel *c)
  {
  
          /*
           * VHT - use the pre-calculated centre frequency
           * of the given channel.
           */
          if (IEEE80211_IS_CHAN_VHT(c))
                  return (ieee80211_ieee2mhz(c->ic_vht_ch_freq1, c->ic_flags));
  
          if (IEEE80211_IS_CHAN_HT40U(c)) {
                  return (c->ic_freq + 10);
          }
          if (IEEE80211_IS_CHAN_HT40D(c)) {
                  return (c->ic_freq - 10);
          }
  
          return (c->ic_freq);
  }
  
  /*
   * For now, no 80+80 support; it will likely always return 0.
   */
  uint32_t
  ieee80211_get_channel_center_freq2(const struct ieee80211_channel *c)
  {
  
          if (IEEE80211_IS_CHAN_VHT(c) && (c->ic_vht_ch_freq2 != 0))
                  return (ieee80211_ieee2mhz(c->ic_vht_ch_freq2, c->ic_flags));
  
          return (0);
  }
  
  /*
   * Adds channels into specified channel list (ieee[] array must be sorted).
   * Channels are already sorted.
   */
  static int
  add_chanlist(struct ieee80211_channel chans[], int maxchans, int *nchans,
      const uint8_t ieee[], int nieee, uint32_t flags[])
  {
          uint16_t freq;
          int i, j, error;
          int is_vht;
  
          for (i = 0; i < nieee; i++) {
                  freq = ieee80211_ieee2mhz(ieee[i], flags[0]);
                  for (j = 0; flags[j] != 0; j++) {
                          /*
                           * Notes:
                           * + HT40 and VHT40 channels occur together, so
                           *   we need to be careful that we actually allow that.
                           * + VHT80, VHT160 will coexist with HT40/VHT40, so
                           *   make sure it's not skipped because of the overlap
                           *   check used for (V)HT40.
                           */
                          is_vht = !! (flags[j] & IEEE80211_CHAN_VHT);
  
                          /* XXX TODO FIXME VHT80P80. */
  
                          /* Test for VHT160 analogue to the VHT80 below. */
                          if (is_vht && flags[j] & IEEE80211_CHAN_VHT160)
                                  if (! is_vht160_valid_freq(freq))
                                          continue;
  
                          /*
                           * Test for VHT80.
                           * XXX This is all very broken right now.
                           * What we /should/ do is:
                           *
                           * + check that the frequency is in the list of
                           *   allowed VHT80 ranges; and
                           * + the other 3 channels in the list are actually
                           *   also available.
                           */
                          if (is_vht && flags[j] & IEEE80211_CHAN_VHT80)
                                  if (! is_vht80_valid_freq(freq))
                                          continue;
  
                          /*
                           * Test for (V)HT40.
                           *
                           * This is also a fall through from VHT80; as we only
                           * allow a VHT80 channel if the VHT40 combination is
                           * also valid.  If the VHT40 form is not valid then
                           * we certainly can't do VHT80..
                           */
                          if (flags[j] & IEEE80211_CHAN_HT40D)
                                  /*
                                   * Can't have a "lower" channel if we are the
                                   * first channel.
                                   *
                                   * Can't have a "lower" channel if it's below/
                                   * within 20MHz of the first channel.
                                   *
                                   * Can't have a "lower" channel if the channel
                                   * below it is not 20MHz away.
                                   */
                                  if (i == 0 || ieee[i] < ieee[0] + 4 ||
                                      freq - 20 !=
                                      ieee80211_ieee2mhz(ieee[i] - 4, flags[j]))
                                          continue;
                          if (flags[j] & IEEE80211_CHAN_HT40U)
                                  /*
                                   * Can't have an "upper" channel if we are
                                   * the last channel.
                                   *
                                   * Can't have an "upper" channel be above the
                                   * last channel in the list.
                                   *
                                   * Can't have an "upper" channel if the next
                                   * channel according to the math isn't 20MHz
                                   * away.  (Likely for channel 13/14.)
                                   */
                                  if (i == nieee - 1 ||
                                      ieee[i] + 4 > ieee[nieee - 1] ||
                                      freq + 20 !=
                                      ieee80211_ieee2mhz(ieee[i] + 4, flags[j]))
                                          continue;
  
                          if (j == 0) {
                                  error = addchan(chans, maxchans, nchans,
                                      ieee[i], freq, 0, flags[j]);
                          } else {
                                  error = copychan_prev(chans, maxchans, nchans,
                                      flags[j]);
                          }
                          if (error != 0)
                                  return (error);
                  }
          }
  
          return (0);
  }
  
  int
  ieee80211_add_channel_list_2ghz(struct ieee80211_channel chans[], int maxchans,
      int *nchans, const uint8_t ieee[], int nieee, const uint8_t bands[],
      int cbw_flags)
  {
          uint32_t flags[IEEE80211_MODE_MAX];
  
          /* XXX no VHT for now */
          getflags_2ghz(bands, flags, cbw_flags);
          KASSERT(flags[0] != 0, ("%s: no correct mode provided\n", __func__));
  
          return (add_chanlist(chans, maxchans, nchans, ieee, nieee, flags));
  }
  
  int
  ieee80211_add_channels_default_2ghz(struct ieee80211_channel chans[],
      int maxchans, int *nchans, const uint8_t bands[], int cbw_flags)
  {
          const uint8_t default_chan_list[] =
              { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 };
  
          return (ieee80211_add_channel_list_2ghz(chans, maxchans, nchans,
              default_chan_list, nitems(default_chan_list), bands, cbw_flags));
  }
  
  int
  ieee80211_add_channel_list_5ghz(struct ieee80211_channel chans[], int maxchans,
      int *nchans, const uint8_t ieee[], int nieee, const uint8_t bands[],
      int cbw_flags)
  {
          /*
           * XXX-BZ with HT and VHT there is no 1:1 mapping anymore.  Review all
           * uses of IEEE80211_MODE_MAX and add a new #define name for array size.
           */
          uint32_t flags[2 * IEEE80211_MODE_MAX];
  
          getflags_5ghz(bands, flags, cbw_flags);
          KASSERT(flags[0] != 0, ("%s: no correct mode provided\n", __func__));
  
          return (add_chanlist(chans, maxchans, nchans, ieee, nieee, flags));
  }
  
  /*
   * Locate a channel given a frequency+flags.  We cache
   * the previous lookup to optimize switching between two
   * channels--as happens with dynamic turbo.
   */
  struct ieee80211_channel *
  ieee80211_find_channel(struct ieee80211com *ic, int freq, int flags)
  {
          struct ieee80211_channel *c;
  
          flags &= IEEE80211_CHAN_ALLTURBO;
          c = ic->ic_prevchan;
          if (c != NULL && c->ic_freq == freq &&
              (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
                  return c;
          /* brute force search */
          return (findchannel(ic->ic_channels, ic->ic_nchans, freq, flags));
  }
  
  /*
   * Locate a channel given a channel number+flags.  We cache
   * the previous lookup to optimize switching between two
   * channels--as happens with dynamic turbo.
   */
  struct ieee80211_channel *
  ieee80211_find_channel_byieee(struct ieee80211com *ic, int ieee, int flags)
  {
          struct ieee80211_channel *c;
          int i;
  
          flags &= IEEE80211_CHAN_ALLTURBO;
          c = ic->ic_prevchan;
          if (c != NULL && c->ic_ieee == ieee &&
              (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
                  return c;
          /* brute force search */
          for (i = 0; i < ic->ic_nchans; i++) {
                  c = &ic->ic_channels[i];
                  if (c->ic_ieee == ieee &&
                      (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
                          return c;
          }
          return NULL;
  }
  
  /*
   * Lookup a channel suitable for the given rx status.
   *
   * This is used to find a channel for a frame (eg beacon, probe
   * response) based purely on the received PHY information.
   *
   * For now it tries to do it based on R_FREQ / R_IEEE.
   * This is enough for 11bg and 11a (and thus 11ng/11na)
   * but it will not be enough for GSM, PSB channels and the
   * like.  It also doesn't know about legacy-turbog and
   * legacy-turbo modes, which some offload NICs actually
   * support in weird ways.
   *
   * Takes the ic and rxstatus; returns the channel or NULL
   * if not found.
   *
   * XXX TODO: Add support for that when the need arises.
   */
  struct ieee80211_channel *
  ieee80211_lookup_channel_rxstatus(struct ieee80211vap *vap,
      const struct ieee80211_rx_stats *rxs)
  {
          struct ieee80211com *ic = vap->iv_ic;
          uint32_t flags;
          struct ieee80211_channel *c;
  
          if (rxs == NULL)
                  return (NULL);
  
          /*
           * Strictly speaking we only use freq for now,
           * however later on we may wish to just store
           * the ieee for verification.
           */
          if ((rxs->r_flags & IEEE80211_R_FREQ) == 0)
                  return (NULL);
          if ((rxs->r_flags & IEEE80211_R_IEEE) == 0)
                  return (NULL);
  
          /*
           * If the rx status contains a valid ieee/freq, then
           * ensure we populate the correct channel information
           * in rxchan before passing it up to the scan infrastructure.
           * Offload NICs will pass up beacons from all channels
           * during background scans.
           */
  
          /* Determine a band */
          /* XXX should be done by the driver? */
          if (rxs->c_freq < 3000) {
                  flags = IEEE80211_CHAN_G;
          } else {
                  flags = IEEE80211_CHAN_A;
          }
  
          /* Channel lookup */
          c = ieee80211_find_channel(ic, rxs->c_freq, flags);
  
          IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT,
              "%s: freq=%d, ieee=%d, flags=0x%08x; c=%p\n",
              __func__, (int) rxs->c_freq, (int) rxs->c_ieee, flags, c);
  
          return (c);
  }
  
  static void
  addmedia(struct ifmedia *media, int caps, int addsta, int mode, int mword)
  {
  #define ADD(_ic, _s, _o) \
          ifmedia_add(media, \
                  IFM_MAKEWORD(IFM_IEEE80211, (_s), (_o), 0), 0, NULL)
          static const u_int mopts[IEEE80211_MODE_MAX] = {
              [IEEE80211_MODE_AUTO]       = IFM_AUTO,
              [IEEE80211_MODE_11A]        = IFM_IEEE80211_11A,
              [IEEE80211_MODE_11B]        = IFM_IEEE80211_11B,
              [IEEE80211_MODE_11G]        = IFM_IEEE80211_11G,
              [IEEE80211_MODE_FH]         = IFM_IEEE80211_FH,
              [IEEE80211_MODE_TURBO_A]    = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
              [IEEE80211_MODE_TURBO_G]    = IFM_IEEE80211_11G|IFM_IEEE80211_TURBO,
              [IEEE80211_MODE_STURBO_A]   = IFM_IEEE80211_11A|IFM_IEEE80211_TURBO,
              [IEEE80211_MODE_HALF]       = IFM_IEEE80211_11A,    /* XXX */
              [IEEE80211_MODE_QUARTER]    = IFM_IEEE80211_11A,    /* XXX */
              [IEEE80211_MODE_11NA]       = IFM_IEEE80211_11NA,
              [IEEE80211_MODE_11NG]       = IFM_IEEE80211_11NG,
              [IEEE80211_MODE_VHT_2GHZ]   = IFM_IEEE80211_VHT2G,
              [IEEE80211_MODE_VHT_5GHZ]   = IFM_IEEE80211_VHT5G,
          };
          u_int mopt;
  
          mopt = mopts[mode];
          if (addsta)
                  ADD(ic, mword, mopt);   /* STA mode has no cap */
          if (caps & IEEE80211_C_IBSS)
                  ADD(media, mword, mopt | IFM_IEEE80211_ADHOC);
          if (caps & IEEE80211_C_HOSTAP)
                  ADD(media, mword, mopt | IFM_IEEE80211_HOSTAP);
          if (caps & IEEE80211_C_AHDEMO)
                  ADD(media, mword, mopt | IFM_IEEE80211_ADHOC | IFM_FLAG0);
          if (caps & IEEE80211_C_MONITOR)
                  ADD(media, mword, mopt | IFM_IEEE80211_MONITOR);
          if (caps & IEEE80211_C_WDS)
                  ADD(media, mword, mopt | IFM_IEEE80211_WDS);
          if (caps & IEEE80211_C_MBSS)
                  ADD(media, mword, mopt | IFM_IEEE80211_MBSS);
  #undef ADD
  }
  
  /*
   * Setup the media data structures according to the channel and
   * rate tables.
   */
  static int
  ieee80211_media_setup(struct ieee80211com *ic,
          struct ifmedia *media, int caps, int addsta,
          ifm_change_cb_t media_change, ifm_stat_cb_t media_stat)
  {
          int i, j, rate, maxrate, mword, r;
          enum ieee80211_phymode mode;
          const struct ieee80211_rateset *rs;
          struct ieee80211_rateset allrates;
  
          /*
           * Fill in media characteristics.
           */
          ifmedia_init(media, 0, media_change, media_stat);
          maxrate = 0;
          /*
           * Add media for legacy operating modes.
           */
          memset(&allrates, 0, sizeof(allrates));
          for (mode = IEEE80211_MODE_AUTO; mode < IEEE80211_MODE_11NA; mode++) {
                  if (isclr(ic->ic_modecaps, mode))
                          continue;
                  addmedia(media, caps, addsta, mode, IFM_AUTO);
                  if (mode == IEEE80211_MODE_AUTO)
                          continue;
                  rs = &ic->ic_sup_rates[mode];
                  for (i = 0; i < rs->rs_nrates; i++) {
                          rate = rs->rs_rates[i];
                          mword = ieee80211_rate2media(ic, rate, mode);
                          if (mword == 0)
                                  continue;
                          addmedia(media, caps, addsta, mode, mword);
                          /*
                           * Add legacy rate to the collection of all rates.
                           */
                          r = rate & IEEE80211_RATE_VAL;
                          for (j = 0; j < allrates.rs_nrates; j++)
                                  if (allrates.rs_rates[j] == r)
                                          break;
                          if (j == allrates.rs_nrates) {
                                  /* unique, add to the set */
                                  allrates.rs_rates[j] = r;
                                  allrates.rs_nrates++;
                          }
                          rate = (rate & IEEE80211_RATE_VAL) / 2;
                          if (rate > maxrate)
                                  maxrate = rate;
                  }
          }
          for (i = 0; i < allrates.rs_nrates; i++) {
                  mword = ieee80211_rate2media(ic, allrates.rs_rates[i],
                                  IEEE80211_MODE_AUTO);
                  if (mword == 0)
                          continue;
                  /* NB: remove media options from mword */
                  addmedia(media, caps, addsta,
                      IEEE80211_MODE_AUTO, IFM_SUBTYPE(mword));
          }
          /*
           * Add HT/11n media.  Note that we do not have enough
           * bits in the media subtype to express the MCS so we
           * use a "placeholder" media subtype and any fixed MCS
           * must be specified with a different mechanism.
           */
          for (; mode <= IEEE80211_MODE_11NG; mode++) {
                  if (isclr(ic->ic_modecaps, mode))
                          continue;
                  addmedia(media, caps, addsta, mode, IFM_AUTO);
                  addmedia(media, caps, addsta, mode, IFM_IEEE80211_MCS);
          }
          if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
              isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
                  addmedia(media, caps, addsta,
                      IEEE80211_MODE_AUTO, IFM_IEEE80211_MCS);
                  i = ic->ic_txstream * 8 - 1;
                  if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) &&
                      (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40))
                          rate = ieee80211_htrates[i].ht40_rate_400ns;
                  else if ((ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40))
                          rate = ieee80211_htrates[i].ht40_rate_800ns;
                  else if ((ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20))
                          rate = ieee80211_htrates[i].ht20_rate_400ns;
                  else
                          rate = ieee80211_htrates[i].ht20_rate_800ns;
                  if (rate > maxrate)
                          maxrate = rate;
          }
  
          /*
           * Add VHT media.
           * XXX-BZ skip "VHT_2GHZ" for now.
           */
          for (mode = IEEE80211_MODE_VHT_5GHZ; mode <= IEEE80211_MODE_VHT_5GHZ;
              mode++) {
                  if (isclr(ic->ic_modecaps, mode))
                          continue;
                  addmedia(media, caps, addsta, mode, IFM_AUTO);
                  addmedia(media, caps, addsta, mode, IFM_IEEE80211_VHT);
          }
          if (isset(ic->ic_modecaps, IEEE80211_MODE_VHT_5GHZ)) {
                 addmedia(media, caps, addsta,
                     IEEE80211_MODE_AUTO, IFM_IEEE80211_VHT);
  
                  /* XXX TODO: VHT maxrate */
          }
  
          return maxrate;
  }
  
  /* XXX inline or eliminate? */
  const struct ieee80211_rateset *
  ieee80211_get_suprates(struct ieee80211com *ic, const struct ieee80211_channel *c)
  {
          /* XXX does this work for 11ng basic rates? */
          return &ic->ic_sup_rates[ieee80211_chan2mode(c)];
  }
  
  /* XXX inline or eliminate? */
  const struct ieee80211_htrateset *
  ieee80211_get_suphtrates(struct ieee80211com *ic,
      const struct ieee80211_channel *c)
  {
          return &ic->ic_sup_htrates;
  }
  
  void
  ieee80211_announce(struct ieee80211com *ic)
  {
          int i, rate, mword;
          enum ieee80211_phymode mode;
          const struct ieee80211_rateset *rs;
  
          /* NB: skip AUTO since it has no rates */
          for (mode = IEEE80211_MODE_AUTO+1; mode < IEEE80211_MODE_11NA; mode++) {
                  if (isclr(ic->ic_modecaps, mode))
                          continue;
                  ic_printf(ic, "%s rates: ", ieee80211_phymode_name[mode]);
                  rs = &ic->ic_sup_rates[mode];
                  for (i = 0; i < rs->rs_nrates; i++) {
                          mword = ieee80211_rate2media(ic, rs->rs_rates[i], mode);
                          if (mword == 0)
                                  continue;
                          rate = ieee80211_media2rate(mword);
                          printf("%s%d%sMbps", (i != 0 ? " " : ""),
                              rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
                  }
                  printf("\n");
          }
          ieee80211_ht_announce(ic);
          ieee80211_vht_announce(ic);
  }
  
  void
  ieee80211_announce_channels(struct ieee80211com *ic)
  {
          const struct ieee80211_channel *c;
          char type;
          int i, cw;
  
          printf("Chan  Freq  CW  RegPwr  MinPwr  MaxPwr\n");
          for (i = 0; i < ic->ic_nchans; i++) {
                  c = &ic->ic_channels[i];
                  if (IEEE80211_IS_CHAN_ST(c))
                          type = 'S';
                  else if (IEEE80211_IS_CHAN_108A(c))
                          type = 'T';
                  else if (IEEE80211_IS_CHAN_108G(c))
                          type = 'G';
                  else if (IEEE80211_IS_CHAN_HT(c))
                          type = 'n';
                  else if (IEEE80211_IS_CHAN_A(c))
                          type = 'a';
                  else if (IEEE80211_IS_CHAN_ANYG(c))
                          type = 'g';
                  else if (IEEE80211_IS_CHAN_B(c))
                          type = 'b';
                  else
                          type = 'f';
                  if (IEEE80211_IS_CHAN_HT40(c) || IEEE80211_IS_CHAN_TURBO(c))
                          cw = 40;
                  else if (IEEE80211_IS_CHAN_HALF(c))
                          cw = 10;
                  else if (IEEE80211_IS_CHAN_QUARTER(c))
                          cw = 5;
                  else
                          cw = 20;
                  printf("%4d  %4d%c %2d%c %6d  %4d.%d  %4d.%d\n"
                          , c->ic_ieee, c->ic_freq, type
                          , cw
                          , IEEE80211_IS_CHAN_HT40U(c) ? '+' :
                            IEEE80211_IS_CHAN_HT40D(c) ? '-' : ' '
                          , c->ic_maxregpower
                          , c->ic_minpower / 2, c->ic_minpower & 1 ? 5 : 0
                          , c->ic_maxpower / 2, c->ic_maxpower & 1 ? 5 : 0
                  );
          }
  }
  
  static int
  media2mode(const struct ifmedia_entry *ime, uint32_t flags, uint16_t *mode)
  {
          switch (IFM_MODE(ime->ifm_media)) {
          case IFM_IEEE80211_11A:
                  *mode = IEEE80211_MODE_11A;
                  break;
          case IFM_IEEE80211_11B:
                  *mode = IEEE80211_MODE_11B;
                  break;
          case IFM_IEEE80211_11G:
                  *mode = IEEE80211_MODE_11G;
                  break;
          case IFM_IEEE80211_FH:
                  *mode = IEEE80211_MODE_FH;
                  break;
          case IFM_IEEE80211_11NA:
                  *mode = IEEE80211_MODE_11NA;
                  break;
          case IFM_IEEE80211_11NG:
                  *mode = IEEE80211_MODE_11NG;
                  break;
          case IFM_IEEE80211_VHT2G:
                  *mode = IEEE80211_MODE_VHT_2GHZ;
                  break;
          case IFM_IEEE80211_VHT5G:
                  *mode = IEEE80211_MODE_VHT_5GHZ;
                  break;
          case IFM_AUTO:
                  *mode = IEEE80211_MODE_AUTO;
                  break;
          default:
                  return 0;
          }
          /*
           * Turbo mode is an ``option''.
           * XXX does not apply to AUTO
           */
          if (ime->ifm_media & IFM_IEEE80211_TURBO) {
                  if (*mode == IEEE80211_MODE_11A) {
                          if (flags & IEEE80211_F_TURBOP)
                                  *mode = IEEE80211_MODE_TURBO_A;
                          else
                                  *mode = IEEE80211_MODE_STURBO_A;
                  } else if (*mode == IEEE80211_MODE_11G)
                          *mode = IEEE80211_MODE_TURBO_G;
                  else
                          return 0;
          }
          /* XXX HT40 +/- */
          return 1;
  }
  
  /*
   * Handle a media change request on the vap interface.
   */
  int
  ieee80211_media_change(struct ifnet *ifp)
  {
          struct ieee80211vap *vap = ifp->if_softc;
          struct ifmedia_entry *ime = vap->iv_media.ifm_cur;
          uint16_t newmode;
  
          if (!media2mode(ime, vap->iv_flags, &newmode))
                  return EINVAL;
          if (vap->iv_des_mode != newmode) {
                  vap->iv_des_mode = newmode;
                  /* XXX kick state machine if up+running */
          }
          return 0;
  }
  
  /*
   * Common code to calculate the media status word
   * from the operating mode and channel state.
   */
  static int
  media_status(enum ieee80211_opmode opmode, const struct ieee80211_channel *chan)
  {
          int status;
  
          status = IFM_IEEE80211;
          switch (opmode) {
          case IEEE80211_M_STA:
                  break;
          case IEEE80211_M_IBSS:
                  status |= IFM_IEEE80211_ADHOC;
                  break;
          case IEEE80211_M_HOSTAP:
                  status |= IFM_IEEE80211_HOSTAP;
                  break;
          case IEEE80211_M_MONITOR:
                  status |= IFM_IEEE80211_MONITOR;
                  break;
          case IEEE80211_M_AHDEMO:
                  status |= IFM_IEEE80211_ADHOC | IFM_FLAG0;
                  break;
          case IEEE80211_M_WDS:
                  status |= IFM_IEEE80211_WDS;
                  break;
          case IEEE80211_M_MBSS:
                  status |= IFM_IEEE80211_MBSS;
                  break;
          }
          if (IEEE80211_IS_CHAN_HTA(chan)) {
                  status |= IFM_IEEE80211_11NA;
          } else if (IEEE80211_IS_CHAN_HTG(chan)) {
                  status |= IFM_IEEE80211_11NG;
          } else if (IEEE80211_IS_CHAN_A(chan)) {
                  status |= IFM_IEEE80211_11A;
          } else if (IEEE80211_IS_CHAN_B(chan)) {
                  status |= IFM_IEEE80211_11B;
          } else if (IEEE80211_IS_CHAN_ANYG(chan)) {
                  status |= IFM_IEEE80211_11G;
          } else if (IEEE80211_IS_CHAN_FHSS(chan)) {
                  status |= IFM_IEEE80211_FH;
          }
          /* XXX else complain? */
  
          if (IEEE80211_IS_CHAN_TURBO(chan))
                  status |= IFM_IEEE80211_TURBO;
  #if 0
          if (IEEE80211_IS_CHAN_HT20(chan))
                  status |= IFM_IEEE80211_HT20;
          if (IEEE80211_IS_CHAN_HT40(chan))
                  status |= IFM_IEEE80211_HT40;
  #endif
          return status;
  }
  
  void
  ieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr)
  {
          struct ieee80211vap *vap = ifp->if_softc;
          struct ieee80211com *ic = vap->iv_ic;
          enum ieee80211_phymode mode;
  
          imr->ifm_status = IFM_AVALID;
          /*
           * NB: use the current channel's mode to lock down a xmit
           * rate only when running; otherwise we may have a mismatch
           * in which case the rate will not be convertible.
           */
          if (vap->iv_state == IEEE80211_S_RUN ||
              vap->iv_state == IEEE80211_S_SLEEP) {
                  imr->ifm_status |= IFM_ACTIVE;
                  mode = ieee80211_chan2mode(ic->ic_curchan);
          } else
                  mode = IEEE80211_MODE_AUTO;
          imr->ifm_active = media_status(vap->iv_opmode, ic->ic_curchan);
          /*
           * Calculate a current rate if possible.
           */
          if (vap->iv_txparms[mode].ucastrate != IEEE80211_FIXED_RATE_NONE) {
                  /*
                   * A fixed rate is set, report that.
                   */
                  imr->ifm_active |= ieee80211_rate2media(ic,
                          vap->iv_txparms[mode].ucastrate, mode);
          } else if (vap->iv_opmode == IEEE80211_M_STA) {
                  /*
                   * In station mode report the current transmit rate.
                   */
                  imr->ifm_active |= ieee80211_rate2media(ic,
                          vap->iv_bss->ni_txrate, mode);
          } else
                  imr->ifm_active |= IFM_AUTO;
          if (imr->ifm_status & IFM_ACTIVE)
                  imr->ifm_current = imr->ifm_active;
  }
  
  /*
   * Set the current phy mode and recalculate the active channel
   * set based on the available channels for this mode.  Also
   * select a new default/current channel if the current one is
   * inappropriate for this mode.
   */
  int
  ieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode)
  {
          /*
           * Adjust basic rates in 11b/11g supported rate set.
           * Note that if operating on a hal/quarter rate channel
           * this is a noop as those rates sets are different
           * and used instead.
           */
          if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
                  ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);
  
          ic->ic_curmode = mode;
          ieee80211_reset_erp(ic);        /* reset global ERP state */
  
          return 0;
  }
  
  /*
   * Return the phy mode for with the specified channel.
   */
  enum ieee80211_phymode
  ieee80211_chan2mode(const struct ieee80211_channel *chan)
  {
  
          if (IEEE80211_IS_CHAN_VHT_2GHZ(chan))
                  return IEEE80211_MODE_VHT_2GHZ;
          else if (IEEE80211_IS_CHAN_VHT_5GHZ(chan))
                  return IEEE80211_MODE_VHT_5GHZ;
          else if (IEEE80211_IS_CHAN_HTA(chan))
                  return IEEE80211_MODE_11NA;
          else if (IEEE80211_IS_CHAN_HTG(chan))
                  return IEEE80211_MODE_11NG;
          else if (IEEE80211_IS_CHAN_108G(chan))
                  return IEEE80211_MODE_TURBO_G;
          else if (IEEE80211_IS_CHAN_ST(chan))
                  return IEEE80211_MODE_STURBO_A;
          else if (IEEE80211_IS_CHAN_TURBO(chan))
                  return IEEE80211_MODE_TURBO_A;
          else if (IEEE80211_IS_CHAN_HALF(chan))
                  return IEEE80211_MODE_HALF;
          else if (IEEE80211_IS_CHAN_QUARTER(chan))
                  return IEEE80211_MODE_QUARTER;
          else if (IEEE80211_IS_CHAN_A(chan))
                  return IEEE80211_MODE_11A;
          else if (IEEE80211_IS_CHAN_ANYG(chan))
                  return IEEE80211_MODE_11G;
          else if (IEEE80211_IS_CHAN_B(chan))
                  return IEEE80211_MODE_11B;
          else if (IEEE80211_IS_CHAN_FHSS(chan))
                  return IEEE80211_MODE_FH;
  
          /* NB: should not get here */
          printf("%s: cannot map channel to mode; freq %u flags 0x%x\n",
                  __func__, chan->ic_freq, chan->ic_flags);
          return IEEE80211_MODE_11B;
  }
  
  struct ratemedia {
          u_int   match;  /* rate + mode */
          u_int   media;  /* if_media rate */
  };
  
  static int
  findmedia(const struct ratemedia rates[], int n, u_int match)
  {
          int i;
  
          for (i = 0; i < n; i++)
                  if (rates[i].match == match)
                          return rates[i].media;
          return IFM_AUTO;
  }
  
  /*
   * Convert IEEE80211 rate value to ifmedia subtype.
   * Rate is either a legacy rate in units of 0.5Mbps
   * or an MCS index.
   */
  int
  ieee80211_rate2media(struct ieee80211com *ic, int rate, enum ieee80211_phymode mode)
  {
          static const struct ratemedia rates[] = {
                  {   2 | IFM_IEEE80211_FH, IFM_IEEE80211_FH1 },
                  {   4 | IFM_IEEE80211_FH, IFM_IEEE80211_FH2 },
                  {   2 | IFM_IEEE80211_11B, IFM_IEEE80211_DS1 },
                  {   4 | IFM_IEEE80211_11B, IFM_IEEE80211_DS2 },
                  {  11 | IFM_IEEE80211_11B, IFM_IEEE80211_DS5 },
                  {  22 | IFM_IEEE80211_11B, IFM_IEEE80211_DS11 },
                  {  44 | IFM_IEEE80211_11B, IFM_IEEE80211_DS22 },
                  {  12 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM6 },
                  {  18 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM9 },
                  {  24 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM12 },
                  {  36 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM18 },
                  {  48 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM24 },
                  {  72 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM36 },
                  {  96 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM48 },
                  { 108 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM54 },
                  {   2 | IFM_IEEE80211_11G, IFM_IEEE80211_DS1 },
                  {   4 | IFM_IEEE80211_11G, IFM_IEEE80211_DS2 },
                  {  11 | IFM_IEEE80211_11G, IFM_IEEE80211_DS5 },
                  {  22 | IFM_IEEE80211_11G, IFM_IEEE80211_DS11 },
                  {  12 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM6 },
                  {  18 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM9 },
                  {  24 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM12 },
                  {  36 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM18 },
                  {  48 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM24 },
                  {  72 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM36 },
                  {  96 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM48 },
                  { 108 | IFM_IEEE80211_11G, IFM_IEEE80211_OFDM54 },
                  {   6 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM3 },
                  {   9 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM4 },
                  {  54 | IFM_IEEE80211_11A, IFM_IEEE80211_OFDM27 },
                  /* NB: OFDM72 doesn't really exist so we don't handle it */
          };
          static const struct ratemedia htrates[] = {
                  {   0, IFM_IEEE80211_MCS },
                  {   1, IFM_IEEE80211_MCS },
                  {   2, IFM_IEEE80211_MCS },
                  {   3, IFM_IEEE80211_MCS },
                  {   4, IFM_IEEE80211_MCS },
                  {   5, IFM_IEEE80211_MCS },
                  {   6, IFM_IEEE80211_MCS },
                  {   7, IFM_IEEE80211_MCS },
                  {   8, IFM_IEEE80211_MCS },
                  {   9, IFM_IEEE80211_MCS },
                  {  10, IFM_IEEE80211_MCS },
                  {  11, IFM_IEEE80211_MCS },
                  {  12, IFM_IEEE80211_MCS },
                  {  13, IFM_IEEE80211_MCS },
                  {  14, IFM_IEEE80211_MCS },
                  {  15, IFM_IEEE80211_MCS },
                  {  16, IFM_IEEE80211_MCS },
                  {  17, IFM_IEEE80211_MCS },
                  {  18, IFM_IEEE80211_MCS },
                  {  19, IFM_IEEE80211_MCS },
                  {  20, IFM_IEEE80211_MCS },
                  {  21, IFM_IEEE80211_MCS },
                  {  22, IFM_IEEE80211_MCS },
                  {  23, IFM_IEEE80211_MCS },
                  {  24, IFM_IEEE80211_MCS },
                  {  25, IFM_IEEE80211_MCS },
                  {  26, IFM_IEEE80211_MCS },
                  {  27, IFM_IEEE80211_MCS },
                  {  28, IFM_IEEE80211_MCS },
                  {  29, IFM_IEEE80211_MCS },
                  {  30, IFM_IEEE80211_MCS },
                  {  31, IFM_IEEE80211_MCS },
                  {  32, IFM_IEEE80211_MCS },
                  {  33, IFM_IEEE80211_MCS },
                  {  34, IFM_IEEE80211_MCS },
                  {  35, IFM_IEEE80211_MCS },
                  {  36, IFM_IEEE80211_MCS },
                  {  37, IFM_IEEE80211_MCS },
                  {  38, IFM_IEEE80211_MCS },
                  {  39, IFM_IEEE80211_MCS },
                  {  40, IFM_IEEE80211_MCS },
                  {  41, IFM_IEEE80211_MCS },
                  {  42, IFM_IEEE80211_MCS },
                  {  43, IFM_IEEE80211_MCS },
                  {  44, IFM_IEEE80211_MCS },
                  {  45, IFM_IEEE80211_MCS },
                  {  46, IFM_IEEE80211_MCS },
                  {  47, IFM_IEEE80211_MCS },
                  {  48, IFM_IEEE80211_MCS },
                  {  49, IFM_IEEE80211_MCS },
                  {  50, IFM_IEEE80211_MCS },
                  {  51, IFM_IEEE80211_MCS },
                  {  52, IFM_IEEE80211_MCS },
                  {  53, IFM_IEEE80211_MCS },
                  {  54, IFM_IEEE80211_MCS },
                  {  55, IFM_IEEE80211_MCS },
                  {  56, IFM_IEEE80211_MCS },
                  {  57, IFM_IEEE80211_MCS },
                  {  58, IFM_IEEE80211_MCS },
                  {  59, IFM_IEEE80211_MCS },
                  {  60, IFM_IEEE80211_MCS },
                  {  61, IFM_IEEE80211_MCS },
                  {  62, IFM_IEEE80211_MCS },
                  {  63, IFM_IEEE80211_MCS },
                  {  64, IFM_IEEE80211_MCS },
                  {  65, IFM_IEEE80211_MCS },
                  {  66, IFM_IEEE80211_MCS },
                  {  67, IFM_IEEE80211_MCS },
                  {  68, IFM_IEEE80211_MCS },
                  {  69, IFM_IEEE80211_MCS },
                  {  70, IFM_IEEE80211_MCS },
                  {  71, IFM_IEEE80211_MCS },
                  {  72, IFM_IEEE80211_MCS },
                  {  73, IFM_IEEE80211_MCS },
                  {  74, IFM_IEEE80211_MCS },
                  {  75, IFM_IEEE80211_MCS },
                  {  76, IFM_IEEE80211_MCS },
          };
          static const struct ratemedia vhtrates[] = {
                  {   0, IFM_IEEE80211_VHT },
                  {   1, IFM_IEEE80211_VHT },
                  {   2, IFM_IEEE80211_VHT },
                  {   3, IFM_IEEE80211_VHT },
                  {   4, IFM_IEEE80211_VHT },
                  {   5, IFM_IEEE80211_VHT },
                  {   6, IFM_IEEE80211_VHT },
                  {   7, IFM_IEEE80211_VHT },
                  {   8, IFM_IEEE80211_VHT },     /* Optional. */
                  {   9, IFM_IEEE80211_VHT },     /* Optional. */
  #if 0
                  /* Some QCA and BRCM seem to support this; offspec. */
                  {  10, IFM_IEEE80211_VHT },
                  {  11, IFM_IEEE80211_VHT },
  #endif
          };
          int m;
  
          /*
           * Check 11ac/11n rates first for match as an MCS.
           */
          if (mode == IEEE80211_MODE_VHT_5GHZ) {
                  if (rate & IFM_IEEE80211_VHT) {
                          rate &= ~IFM_IEEE80211_VHT;
                          m = findmedia(vhtrates, nitems(vhtrates), rate);
                          if (m != IFM_AUTO)
                                  return (m | IFM_IEEE80211_VHT);
                  }
          } else if (mode == IEEE80211_MODE_11NA) {
                  if (rate & IEEE80211_RATE_MCS) {
                          rate &= ~IEEE80211_RATE_MCS;
                          m = findmedia(htrates, nitems(htrates), rate);
                          if (m != IFM_AUTO)
                                  return m | IFM_IEEE80211_11NA;
                  }
          } else if (mode == IEEE80211_MODE_11NG) {
                  /* NB: 12 is ambiguous, it will be treated as an MCS */
                  if (rate & IEEE80211_RATE_MCS) {
                          rate &= ~IEEE80211_RATE_MCS;
                          m = findmedia(htrates, nitems(htrates), rate);
                          if (m != IFM_AUTO)
                                  return m | IFM_IEEE80211_11NG;
                  }
          }
          rate &= IEEE80211_RATE_VAL;
          switch (mode) {
          case IEEE80211_MODE_11A:
          case IEEE80211_MODE_HALF:               /* XXX good 'nuf */
          case IEEE80211_MODE_QUARTER:
          case IEEE80211_MODE_11NA:
          case IEEE80211_MODE_TURBO_A:
          case IEEE80211_MODE_STURBO_A:
                  return findmedia(rates, nitems(rates),
                      rate | IFM_IEEE80211_11A);
          case IEEE80211_MODE_11B:
                  return findmedia(rates, nitems(rates),
                      rate | IFM_IEEE80211_11B);
          case IEEE80211_MODE_FH:
                  return findmedia(rates, nitems(rates),
                      rate | IFM_IEEE80211_FH);
          case IEEE80211_MODE_AUTO:
                  /* NB: ic may be NULL for some drivers */
                  if (ic != NULL && ic->ic_phytype == IEEE80211_T_FH)
                          return findmedia(rates, nitems(rates),
                              rate | IFM_IEEE80211_FH);
                  /* NB: hack, 11g matches both 11b+11a rates */
                  /* fall thru... */
          case IEEE80211_MODE_11G:
          case IEEE80211_MODE_11NG:
          case IEEE80211_MODE_TURBO_G:
                  return findmedia(rates, nitems(rates), rate | IFM_IEEE80211_11G);
          case IEEE80211_MODE_VHT_2GHZ:
          case IEEE80211_MODE_VHT_5GHZ:
                  /* XXX TODO: need to figure out mapping for VHT rates */
                  return IFM_AUTO;
          }
          return IFM_AUTO;
  }
  
  int
  ieee80211_media2rate(int mword)
  {
          static const int ieeerates[] = {
                  -1,             /* IFM_AUTO */
                  0,              /* IFM_MANUAL */
                  0,              /* IFM_NONE */
                  2,              /* IFM_IEEE80211_FH1 */
                  4,              /* IFM_IEEE80211_FH2 */
                  2,              /* IFM_IEEE80211_DS1 */
                  4,              /* IFM_IEEE80211_DS2 */
                  11,             /* IFM_IEEE80211_DS5 */
                  22,             /* IFM_IEEE80211_DS11 */
                  44,             /* IFM_IEEE80211_DS22 */
                  12,             /* IFM_IEEE80211_OFDM6 */
                  18,             /* IFM_IEEE80211_OFDM9 */
                  24,             /* IFM_IEEE80211_OFDM12 */
                  36,             /* IFM_IEEE80211_OFDM18 */
                  48,             /* IFM_IEEE80211_OFDM24 */
                  72,             /* IFM_IEEE80211_OFDM36 */
                  96,             /* IFM_IEEE80211_OFDM48 */
                  108,            /* IFM_IEEE80211_OFDM54 */
                  144,            /* IFM_IEEE80211_OFDM72 */
                  0,              /* IFM_IEEE80211_DS354k */
                  0,              /* IFM_IEEE80211_DS512k */
                  6,              /* IFM_IEEE80211_OFDM3 */
                  9,              /* IFM_IEEE80211_OFDM4 */
                  54,             /* IFM_IEEE80211_OFDM27 */
                  -1,             /* IFM_IEEE80211_MCS */
                  -1,             /* IFM_IEEE80211_VHT */
          };
          return IFM_SUBTYPE(mword) < nitems(ieeerates) ?
                  ieeerates[IFM_SUBTYPE(mword)] : 0;
  }
  
  /*
   * The following hash function is adapted from "Hash Functions" by Bob Jenkins
   * ("Algorithm Alley", Dr. Dobbs Journal, September 1997).
   */
  #define mix(a, b, c)                                                    \
  do {                                                                    \
          a -= b; a -= c; a ^= (c >> 13);                                 \
          b -= c; b -= a; b ^= (a << 8);                                  \
          c -= a; c -= b; c ^= (b >> 13);                                 \
          a -= b; a -= c; a ^= (c >> 12);                                 \
          b -= c; b -= a; b ^= (a << 16);                                 \
          c -= a; c -= b; c ^= (b >> 5);                                  \
          a -= b; a -= c; a ^= (c >> 3);                                  \
          b -= c; b -= a; b ^= (a << 10);                                 \
          c -= a; c -= b; c ^= (b >> 15);                                 \
  } while (/*CONSTCOND*/0)
  
  uint32_t
  ieee80211_mac_hash(const struct ieee80211com *ic,
          const uint8_t addr[IEEE80211_ADDR_LEN])
  {
          uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = ic->ic_hash_key;
  
          b += addr[5] << 8;
          b += addr[4];
          a += addr[3] << 24;
          a += addr[2] << 16;
          a += addr[1] << 8;
          a += addr[0];
  
          mix(a, b, c);
  
          return c;
  }
  #undef mix
  
  char
  ieee80211_channel_type_char(const struct ieee80211_channel *c)
  {
          if (IEEE80211_IS_CHAN_ST(c))
                  return 'S';
          if (IEEE80211_IS_CHAN_108A(c))
                  return 'T';
          if (IEEE80211_IS_CHAN_108G(c))
                  return 'G';
          if (IEEE80211_IS_CHAN_VHT(c))
                  return 'v';
          if (IEEE80211_IS_CHAN_HT(c))
                  return 'n';
          if (IEEE80211_IS_CHAN_A(c))
                  return 'a';
          if (IEEE80211_IS_CHAN_ANYG(c))
                  return 'g';
          if (IEEE80211_IS_CHAN_B(c))
                  return 'b';
          return 'f';
  }

Cache object: 618ef072ea2b00866666b821a58d68a3