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[haiku.git] / src / libs / compat / freebsd_wlan / net80211 / ieee80211.c

/*-
 * 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/socket.h>

#include <net/if.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 <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",
};
/* 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
};

static 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  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  void ieee80211com_media_status(struct ifnet *, struct ifmediareq *);
static  int ieee80211com_media_change(struct ifnet *);
static  int media_status(enum ieee80211_opmode,
                const struct ieee80211_channel *);

/*
 * 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

/*
 * Fill in 802.11 available channel set, mark
 * all available channels as active, and pick
 * a default channel if not already specified.
 */
static 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);
                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);
                /* 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);
        }
        /* 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);

        /*
         * 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;

        /*
         * 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 ifnet *ifp)
{
        if_printf(ifp, "need multicast update callback\n");
}

static void
null_update_promisc(struct ifnet *ifp)
{
        if_printf(ifp, "need promiscuous mode update callback\n");
}

static int
null_transmit(struct ifnet *ifp, struct mbuf *m)
{
        m_freem(m);
        ifp->if_oerrors++;
        return EACCES;          /* XXX EIO/EPERM? */
}

static int
null_output(struct ifnet *ifp, struct mbuf *m,
        struct sockaddr *dst, struct route *ro)
{
        if_printf(ifp, "discard raw packet\n");
        return null_transmit(ifp, m);
}

static void
null_input(struct ifnet *ifp, struct mbuf *m)
{
        if_printf(ifp, "if_input should not be called\n");
        m_freem(m);
}

/*
 * 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,
        const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
        struct ifnet *ifp = ic->ic_ifp;
        struct sockaddr_dl *sdl;
        struct ifaddr *ifa;

        KASSERT(ifp->if_type == IFT_IEEE80211, ("if_type %d", ifp->if_type));

        IEEE80211_LOCK_INIT(ic, ifp->if_xname);
        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 taskq",
            ifp->if_xname);
        /*
         * Fill in 802.11 available channel set, mark all
         * available channels as active, and pick a default
         * channel if not already specified.
         */
        ieee80211_media_init(ic);

        ic->ic_update_mcast = null_update_mcast;
        ic->ic_update_promisc = null_update_promisc;

        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_scan_attach(ic);
        ieee80211_regdomain_attach(ic);
        ieee80211_dfs_attach(ic);
#if defined(__HAIKU__)
        ieee80211_ratectl_attach(ic);
#endif

        ieee80211_sysctl_attach(ic);

        ifp->if_addrlen = IEEE80211_ADDR_LEN;
        ifp->if_hdrlen = 0;
        if_attach(ifp);
        ifp->if_mtu = IEEE80211_MTU_MAX;
        ifp->if_broadcastaddr = ieee80211broadcastaddr;
        ifp->if_output = null_output;
        ifp->if_input = null_input;     /* just in case */
        ifp->if_resolvemulti = NULL;    /* NB: callers check */

#ifndef __HAIKU__
        ifa = ifaddr_byindex(ifp->if_index);
        KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
        sdl = (struct sockaddr_dl *)ifa->ifa_addr;;
#else
        sdl = &ifp->if_lladdr;
#endif
        sdl->sdl_type = IFT_ETHER;              /* XXX IFT_IEEE80211? */
        sdl->sdl_alen = IEEE80211_ADDR_LEN;
        IEEE80211_ADDR_COPY(LLADDR(sdl), macaddr);
        ifa_free(ifa);
}

/*
 * 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 ifnet *ifp = ic->ic_ifp;
        struct ieee80211vap *vap;

        if_detach(ifp);

        while ((vap = TAILQ_FIRST(&ic->ic_vaps)) != NULL)
                ieee80211_vap_destroy(vap);
        ieee80211_waitfor_parent(ic);

        ieee80211_sysctl_detach(ic);
#if defined(__HAIKU__)
        ieee80211_ratectl_detach(ic);
#endif
        ieee80211_dfs_detach(ic);
        ieee80211_regdomain_detach(ic);
        ieee80211_scan_detach(ic);
#ifdef IEEE80211_SUPPORT_SUPERG
        ieee80211_superg_detach(ic);
#endif
        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);

        ifmedia_removeall(&ic->ic_media);
        taskqueue_free(ic->ic_tq);
        IEEE80211_LOCK_DESTROY(ic);
}

/*
 * 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;
}

/*
 * 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, int opmode, int flags,
        const uint8_t bssid[IEEE80211_ADDR_LEN],
        const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
        struct ifnet *ifp;

        ifp = if_alloc(IFT_ETHER);
        if (ifp == NULL) {
                if_printf(ic->ic_ifp, "%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_start = ieee80211_start;
        ifp->if_ioctl = ieee80211_ioctl;
        ifp->if_init = ieee80211_init;
        /* NB: input+output filled in by ether_ifattach */
        IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
        ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
        IFQ_SET_READY(&ifp->if_snd);

        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;
        vap->iv_htcaps = ic->ic_htcaps;
        vap->iv_htextcaps = ic->ic_htextcaps;
        vap->iv_opmode = opmode;
        vap->iv_caps |= ieee80211_opcap[opmode];
        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
        }
        /* 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 0
        if (vap->iv_opmode == IEEE80211_M_STA &&
            (vap->iv_caps & IEEE80211_C_BGSCAN))
                vap->iv_flags |= IEEE80211_F_BGSCAN;
#endif
        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;

        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;

        IEEE80211_ADDR_COPY(vap->iv_myaddr, macaddr);

        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_scan_vattach(vap);
        ieee80211_regdomain_vattach(vap);
        ieee80211_radiotap_vattach(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)
{
        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_ifp->if_xname, 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, vap->iv_myaddr);
        if (vap->iv_opmode == IEEE80211_M_MONITOR) {
                /* NB: disallow transmit */
                ifp->if_transmit = null_transmit;
                ifp->if_output = null_output;
        } else {
                /* 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_syncifflag_locked(ic, IFF_PROMISC);
        ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
        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;

        IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s parent %s\n",
            __func__, ieee80211_opmode_name[vap->iv_opmode],
            ic->ic_ifp->if_xname);

        /* 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_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);
        /* NB: this handles the bpfdetach done below */
        ieee80211_syncflag_ext_locked(ic, IEEE80211_FEXT_BPF);
        ieee80211_syncifflag_locked(ic, IFF_PROMISC);
        ieee80211_syncifflag_locked(ic, IFF_ALLMULTI);
        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_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);
}

/*
 * Synchronize flag bit state in the parent ifnet structure
 * according to the state of all vap ifnet's.  This is used,
 * for example, to handle IFF_PROMISC and IFF_ALLMULTI.
 */
void
ieee80211_syncifflag_locked(struct ieee80211com *ic, int flag)
{
        struct ifnet *ifp = ic->ic_ifp;
        struct ieee80211vap *vap;
        int bit, oflags;

        IEEE80211_LOCK_ASSERT(ic);

        bit = 0;
        TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                if (vap->iv_ifp->if_flags & flag) {
                        /*
                         * XXX the bridge sets PROMISC but we don't want to
                         * enable it on the device, discard here so all the
                         * drivers don't need to special-case it
                         */
                        if (flag == IFF_PROMISC &&
                            !(vap->iv_opmode == IEEE80211_M_MONITOR ||
                              (vap->iv_opmode == IEEE80211_M_AHDEMO &&
                               (vap->iv_caps & IEEE80211_C_TDMA) == 0)))
                                continue;
                        bit = 1;
                        break;
                }
        oflags = ifp->if_flags;
        if (bit)
                ifp->if_flags |= flag;
        else
                ifp->if_flags &= ~flag;
        if ((ifp->if_flags ^ oflags) & flag) {
                /* XXX should we return 1/0 and let caller do this? */
                if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
                        if (flag == IFF_PROMISC)
                                ieee80211_runtask(ic, &ic->ic_promisc_task);
                        else if (flag == IFF_ALLMULTI)
                                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_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) {
                if_printf(ic->ic_ifp, "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);
        }
}

/*
 * 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;
        int i;

        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 */
        for (i = 0; i < ic->ic_nchans; i++) {
                c = &ic->ic_channels[i];
                if (c->ic_freq == freq &&
                    (c->ic_flags & IEEE80211_CHAN_ALLTURBO) == flags)
                        return c;
        }
        return NULL;
}

/*
 * 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;
}

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,
        };
        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, mode, rate, maxrate, mword, r;
        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;
        }
        return maxrate;
}

void
ieee80211_media_init(struct ieee80211com *ic)
{
        struct ifnet *ifp = ic->ic_ifp;
        int maxrate;

        /* NB: this works because the structure is initialized to zero */
        if (!LIST_EMPTY(&ic->ic_media.ifm_list)) {
                /*
                 * We are re-initializing the channel list; clear
                 * the existing media state as the media routines
                 * don't suppress duplicates.
                 */
                ifmedia_removeall(&ic->ic_media);
        }
        ieee80211_chan_init(ic);

        /*
         * Recalculate media settings in case new channel list changes
         * the set of available modes.
         */
        maxrate = ieee80211_media_setup(ic, &ic->ic_media, ic->ic_caps, 1,
                ieee80211com_media_change, ieee80211com_media_status);
        /* NB: strip explicit mode; we're actually in autoselect */
        ifmedia_set(&ic->ic_media,
            media_status(ic->ic_opmode, ic->ic_curchan) &~
                (IFM_MMASK | IFM_IEEE80211_TURBO));
        if (maxrate)
                ifp->if_baudrate = IF_Mbps(maxrate);

        /* XXX need to propagate new media settings to vap's */
}

/* 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)];
}

void
ieee80211_announce(struct ieee80211com *ic)
{
        struct ifnet *ifp = ic->ic_ifp;
        int i, mode, rate, mword;
        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;
                if_printf(ifp, "%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);
}

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_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 underlying interface.
 */
int
ieee80211com_media_change(struct ifnet *ifp)
{
        return EINVAL;
}

/*
 * 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;
}

static void
ieee80211com_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
        struct ieee80211com *ic = ifp->if_l2com;
        struct ieee80211vap *vap;

        imr->ifm_status = IFM_AVALID;
        TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
                if (vap->iv_ifp->if_flags & IFF_UP) {
                        imr->ifm_status |= IFM_ACTIVE;
                        break;
                }
        imr->ifm_active = media_status(ic->ic_opmode, ic->ic_curchan);
        if (imr->ifm_status & IFM_ACTIVE)
                imr->ifm_current = imr->ifm_active;
}

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) {
                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 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_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)
{
#define N(a)    (sizeof(a) / sizeof(a[0]))
        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 realy 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 },
        };
        int m;

        /*
         * Check 11n rates first for match as an MCS.
         */
        if (mode == IEEE80211_MODE_11NA) {
                if (rate & IEEE80211_RATE_MCS) {
                        rate &= ~IEEE80211_RATE_MCS;
                        m = findmedia(htrates, N(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, N(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, N(rates), rate | IFM_IEEE80211_11A);
        case IEEE80211_MODE_11B:
                return findmedia(rates, N(rates), rate | IFM_IEEE80211_11B);
        case IEEE80211_MODE_FH:
                return findmedia(rates, N(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, N(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, N(rates), rate | IFM_IEEE80211_11G);
        }
        return IFM_AUTO;
#undef N
}

int
ieee80211_media2rate(int mword)
{
#define N(a)    (sizeof(a) / sizeof(a[0]))
        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 */
        };
        return IFM_SUBTYPE(mword) < N(ieeerates) ?
                ieeerates[IFM_SUBTYPE(mword)] : 0;
#undef N
}

/*
 * 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