io/net80211/net80211.c

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 2001 Atsushi Onoe
 * Copyright (c) 2002-2005 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * 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.
 */

/*
 * IEEE 802.11 generic handler
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/cmn_err.h>
#include <sys/modctl.h>
#include <sys/stropts.h>
#include <sys/door.h>
#include <sys/mac_provider.h>
#include "net80211_impl.h"

uint32_t ieee80211_debug = 0x0; /* debug msg flags */

const char *ieee80211_phymode_name[] = {
    "auto",     /* IEEE80211_MODE_AUTO */
    "11a",      /* IEEE80211_MODE_11A */
    "11b",      /* IEEE80211_MODE_11B */
    "11g",      /* IEEE80211_MODE_11G */
    "FH",       /* IEEE80211_MODE_FH */
    "turboA",   /* IEEE80211_MODE_TURBO_A */
    "turboG",   /* IEEE80211_MODE_TURBO_G */
    "sturboA",  /* IEEE80211_MODE_STURBO_A */
    "11na",     /* IEEE80211_MODE_11NA */
    "11ng",     /* IEEE80211_MODE_11NG */
};

#define IEEE80211_DPRINT(_level, _fmt)  do {    \
        _NOTE(CONSTCOND)        \
        va_list ap;         \
        va_start(ap, (_fmt));       \
        vcmn_err((_level), (_fmt), ap); \
        va_end(ap);         \
        _NOTE(CONSTCOND)        \
    } while (0)

/*
 * Print error messages
 */
void
ieee80211_err(const int8_t *fmt, ...)
{
    IEEE80211_DPRINT(CE_WARN, fmt);
}

/*
 * Print debug messages
 */
void
ieee80211_dbg(uint32_t flag, const int8_t *fmt, ...)
{
    if (flag & ieee80211_debug)
        IEEE80211_DPRINT(CE_CONT, fmt);
}

/*
 * Alloc memory, and save the size
 */
void *
ieee80211_malloc(size_t size)
{
    void *p = kmem_zalloc((size + 4), KM_SLEEP);
    *(int *)p = size;
    p = (char *)p + 4;

    return (p);
}

void
ieee80211_free(void *p)
{
    void *tp = (char *)p - 4;
    kmem_free((char *)p - 4, *(int *)tp + 4);
}

void
ieee80211_mac_update(ieee80211com_t *ic)
{
    wifi_data_t wd = { 0 };
    ieee80211_node_t *in;

    /*
     * We can send data now; update the fastpath with our
     * current associated BSSID and other relevant settings.
     */
    in = ic->ic_bss;
    wd.wd_secalloc = ieee80211_crypto_getciphertype(ic);
    wd.wd_opmode = ic->ic_opmode;
    IEEE80211_ADDR_COPY(wd.wd_bssid, in->in_bssid);
    wd.wd_qospad = 0;
    if (in->in_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) {
        wd.wd_qospad = 2;
        if (ic->ic_flags & IEEE80211_F_DATAPAD)
            wd.wd_qospad = roundup(wd.wd_qospad, sizeof (uint32_t));
    }
    (void) mac_pdata_update(ic->ic_mach, &wd, sizeof (wd));
    mac_tx_update(ic->ic_mach);
    ieee80211_dbg(IEEE80211_MSG_ANY, "ieee80211_mac_update"
        "(cipher = %d)\n", wd.wd_secalloc);
}

/*
 * ieee80211_event_thread
 * open door of wpa, send event to wpad service
 */
static void
ieee80211_event_thread(void *arg)
{
    ieee80211com_t *ic = arg;
    door_handle_t event_door = NULL;    /* Door for upcalls */
    wl_events_t ev;
    door_arg_t darg;

    mutex_enter(&ic->ic_doorlock);

    ev.event = ic->ic_eventq[ic->ic_evq_head];
    ic->ic_evq_head ++;
    if (ic->ic_evq_head >= MAX_EVENT)
        ic->ic_evq_head = 0;

    ieee80211_dbg(IEEE80211_MSG_DEBUG, "ieee80211_event(%d)\n", ev.event);
    /*
     * Locate the door used for upcalls
     */
    if (door_ki_open(ic->ic_wpadoor, &event_door) != 0) {
        ieee80211_err("ieee80211_event: door_ki_open(%s) failed\n",
            ic->ic_wpadoor);
        goto out;
    }

    darg.data_ptr = (char *)&ev;
    darg.data_size = sizeof (wl_events_t);
    darg.desc_ptr = NULL;
    darg.desc_num = 0;
    darg.rbuf = NULL;
    darg.rsize = 0;

    if (door_ki_upcall_limited(event_door, &darg, NULL, SIZE_MAX, 0) != 0) {
        ieee80211_err("ieee80211_event: door_ki_upcall() failed\n");
    }

    if (event_door) {   /* release our hold (if any) */
        door_ki_rele(event_door);
    }

out:
    mutex_exit(&ic->ic_doorlock);
}

/*
 * Notify state transition event message to WPA daemon
 */
void
ieee80211_notify(ieee80211com_t *ic, wpa_event_type event)
{
    if ((ic->ic_flags & IEEE80211_F_WPA) == 0)
        return;     /* Not running on WPA mode */

    ic->ic_eventq[ic->ic_evq_tail] = event;
    ic->ic_evq_tail ++;
    if (ic->ic_evq_tail >= MAX_EVENT) ic->ic_evq_tail = 0;

    /* async */
    (void) timeout(ieee80211_event_thread, (void *)ic, 0);
}

/*
 * Register WPA door
 */
void
ieee80211_register_door(ieee80211com_t *ic, const char *drvname, int inst)
{
    (void) snprintf(ic->ic_wpadoor, MAX_IEEE80211STR, "%s_%s%d",
        WPA_DOOR, drvname, inst);
}

/*
 * 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.
 */
/* ARGSUSED */
static int
ieee80211_default_reset(ieee80211com_t *ic)
{
    return (ENETRESET);
}

/*
 * Convert channel to IEEE channel number.
 */
uint32_t
ieee80211_chan2ieee(ieee80211com_t *ic, struct ieee80211_channel *ch)
{
    if ((ic->ic_sup_channels <= ch) &&
        (ch <= &ic->ic_sup_channels[IEEE80211_CHAN_MAX])) {
        return (ch - ic->ic_sup_channels);
    } else if (ch == IEEE80211_CHAN_ANYC) {
        return (IEEE80211_CHAN_ANY);
    } else if (ch != NULL) {
        ieee80211_err("invalid channel freq %u flags %x\n",
            ch->ich_freq, ch->ich_flags);
        return (0);
    }
    ieee80211_err("invalid channel (NULL)\n");  /* ch == NULL */
    return (0);
}

/*
 * Convert IEEE channel number to MHz frequency.
 *    chan    IEEE channel number
 *    flags   specify whether the frequency is in the 2GHz ISM
 *            band or the 5GHz band
 *
 * 802.11b 2GHz: 14 channels, each 5 MHz wide. Channel 1 is placed
 * at 2.412 GHz, channel 2 at 2.417 GHz, and so on up to channel 13
 * at 2.472 GHz. Channel 14 was defined especially for operation in
 * Japan, and has a center frequency 2.484 GHz.
 * 802.11g 2GHz: adopts the frequency plan of 802.11b. Japan only
 * allows 802.11g operation in channels 1-13
 * 802.11a 5GHz: starting every 5 MHz
 * 802.11b/g channels 15-24 (2512-2692) are used by some implementation
 * (Atheros etc.)
 */
uint32_t
ieee80211_ieee2mhz(uint32_t chan, uint32_t flags)
{
    if (flags & IEEE80211_CHAN_2GHZ) {  /* 2GHz band */
        if (chan == 14)
            return (2484);
        if (chan < 14)
            return (2412 + (chan - 1) * 5);
        else
            return (2512 + ((chan - 15) * 20));
    } else if (flags & IEEE80211_CHAN_5GHZ) {   /* 5Ghz band */
        return (5000 + (chan * 5)); /* OFDM */
    } else {                /* either, guess */
        if (chan == 14)
            return (2484);
        if (chan < 14)          /* 0-13 */
            return (2412 + (chan - 1) * 5);
        if (chan < 27)          /* 15-26 */
            return (2512 + ((chan - 15) * 20));
        return (5000 + (chan * 5));
    }
}

/*
 * Do late attach work. It must be called by the driver after
 * calling ieee80211_attach() and before calling most ieee80211
 * functions.
 */
void
ieee80211_media_init(ieee80211com_t *ic)
{
    /*
     * Do late attach work that must wait for any subclass
     * (i.e. driver) work such as overriding methods.
     */
    ieee80211_node_lateattach(ic);
}

/*
 * Start Watchdog timer. After count down timer(s), ic_watchdog
 * will be called
 */
void
ieee80211_start_watchdog(ieee80211com_t *ic, uint32_t timer)
{
    if (ic->ic_watchdog_timer == 0 && ic->ic_watchdog != NULL) {
        ic->ic_watchdog_timer = timeout(ic->ic_watchdog, ic,
            drv_usectohz(1000000 * timer));
    }
}

/*
 * Stop watchdog timer.
 */
void
ieee80211_stop_watchdog(ieee80211com_t *ic)
{
    if (ic->ic_watchdog_timer != 0) {
        if (ic->ic_watchdog != NULL)
            (void) untimeout(ic->ic_watchdog_timer);
        ic->ic_watchdog_timer = 0;
    }
}

/*
 * Called from a driver's xxx_watchdog routine. It is used to
 * perform periodic cleanup of state for net80211, as well as
 * timeout scans.
 */
void
ieee80211_watchdog(void *arg)
{
    ieee80211com_t *ic = arg;
    struct ieee80211_impl *im = ic->ic_private;
    ieee80211_node_table_t *nt;
    int inact_timer = 0;

    if (ic->ic_state == IEEE80211_S_INIT)
        return;

    IEEE80211_LOCK(ic);
    if ((im->im_mgt_timer != 0) && (--im->im_mgt_timer == 0)) {
        IEEE80211_UNLOCK(ic);
        ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
        IEEE80211_LOCK(ic);
    }

    nt = &ic->ic_scan;
    if (nt->nt_inact_timer != 0) {
        if (--nt->nt_inact_timer == 0)
            nt->nt_timeout(nt);
        inact_timer += nt->nt_inact_timer;
    }
    nt = &ic->ic_sta;
    if (nt->nt_inact_timer != 0) {
        if (--nt->nt_inact_timer == 0)
            nt->nt_timeout(nt);
        inact_timer += nt->nt_inact_timer;
    }

    IEEE80211_UNLOCK(ic);

    if (im->im_mgt_timer != 0 || inact_timer > 0)
        ieee80211_start_watchdog(ic, 1);
}

/*
 * Set the current phy mode and recalculate the active channel
 * set and supported rates based on the available channels for
 * this mode. Also select a new BSS channel if the current one
 * is inappropriate for this mode.
 * This function is called by net80211, and not intended to be
 * called directly.
 */
static int
ieee80211_setmode(ieee80211com_t *ic, enum ieee80211_phymode mode)
{
    static const uint32_t chanflags[] = {
        0,          /* IEEE80211_MODE_AUTO */
        IEEE80211_CHAN_A,   /* IEEE80211_MODE_11A */
        IEEE80211_CHAN_B,   /* IEEE80211_MODE_11B */
        IEEE80211_CHAN_PUREG,   /* IEEE80211_MODE_11G */
        IEEE80211_CHAN_FHSS,    /* IEEE80211_MODE_FH */
        IEEE80211_CHAN_T,   /* IEEE80211_MODE_TURBO_A */
        IEEE80211_CHAN_108G,    /* IEEE80211_MODE_TURBO_G */
        IEEE80211_CHAN_ST,  /* IEEE80211_MODE_STURBO_A */
        IEEE80211_CHAN_A,   /* IEEE80211_MODE_11NA (check legacy) */
        IEEE80211_CHAN_G,   /* IEEE80211_MODE_11NG (check legacy) */
    };
    struct ieee80211_channel *ch;
    uint32_t modeflags;
    int i;
    int achannels = 0;

    /* validate new mode */
    if ((ic->ic_modecaps & (1 << mode)) == 0) {
        ieee80211_err("ieee80211_setmode(): mode %u not supported"
            " (caps 0x%x)\n", mode, ic->ic_modecaps);
        return (EINVAL);
    }

    /*
     * Verify at least one channel is present in the available
     * channel list before committing to the new mode.
     * Calculate the active channel set.
     */
    ASSERT(mode < IEEE80211_N(chanflags));
    modeflags = chanflags[mode];
    bzero(ic->ic_chan_active, sizeof (ic->ic_chan_active));
    for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
        ch = &ic->ic_sup_channels[i];
        if (ch->ich_flags == 0)
            continue;
        if (mode == IEEE80211_MODE_AUTO) {
            /* take anything but pure turbo channels */
            if ((ch->ich_flags & ~IEEE80211_CHAN_TURBO) != 0) {
                ieee80211_setbit(ic->ic_chan_active, i);
                achannels++;
            }
        } else {
            if ((ch->ich_flags & modeflags) == modeflags) {
                ieee80211_setbit(ic->ic_chan_active, i);
                achannels++;
            }
        }
    }
    if (achannels == 0) {
        ieee80211_err("ieee80211_setmode(): "
            "no channel found for mode %u\n", mode);
        return (EINVAL);
    }

    /*
     * If no current/default channel is setup or the current
     * channel is wrong for the mode then pick the first
     * available channel from the active list.  This is likely
     * not the right one.
     */
    if (ic->ic_ibss_chan == NULL ||
        ieee80211_isclr(ic->ic_chan_active,
        ieee80211_chan2ieee(ic, ic->ic_ibss_chan))) {
        for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
            if (ieee80211_isset(ic->ic_chan_active, i)) {
                ic->ic_ibss_chan = &ic->ic_sup_channels[i];
                break;
            }
        }
    }
    /*
     * If the desired channel is set but no longer valid then reset it.
     */
    if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
        ieee80211_isclr(ic->ic_chan_active,
        ieee80211_chan2ieee(ic, ic->ic_des_chan))) {
        ic->ic_des_chan = IEEE80211_CHAN_ANYC;
    }

    /*
     * Do mode-specific rate setup.
     */
    if (mode == IEEE80211_MODE_11G || mode == IEEE80211_MODE_11B)
        ieee80211_setbasicrates(&ic->ic_sup_rates[mode], mode);

    /*
     * Setup an initial rate set according to the
     * current/default channel.  This will be changed
     * when scanning but must exist now so drivers have
     * consistent state of ic_bsschan.
     */
    if (ic->ic_bss != NULL)
        ic->ic_bss->in_rates = ic->ic_sup_rates[mode];
    ic->ic_curmode = mode;
    ieee80211_reset_erp(ic);    /* reset ERP state */
    ieee80211_wme_initparams(ic);   /* reset WME stat */

    return (0);
}

/*
 * Return the phy mode for with the specified channel so the
 * caller can select a rate set.  This is problematic for channels
 * where multiple operating modes are possible (e.g. 11g+11b).
 * In those cases we defer to the current operating mode when set.
 */
/* ARGSUSED */
enum ieee80211_phymode
ieee80211_chan2mode(ieee80211com_t *ic, 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_T(chan))
        return (IEEE80211_MODE_TURBO_A);
    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 */
    ieee80211_err("cannot map channel to mode; freq %u flags 0x%x\n",
        chan->ich_freq, chan->ich_flags);

    return (IEEE80211_MODE_11B);
}

const struct ieee80211_rateset *
ieee80211_get_suprates(ieee80211com_t *ic, struct ieee80211_channel *c)
{
    if (IEEE80211_IS_CHAN_HTA(c))
        return (&ic->ic_sup_rates[IEEE80211_MODE_11A]);
    if (IEEE80211_IS_CHAN_HTG(c)) {
        return (&ic->ic_sup_rates[IEEE80211_MODE_11G]);
    }
    return (&ic->ic_sup_rates[ieee80211_chan2mode(ic, c)]);
}

/*
 * Locate a channel given a frequency+flags.  We cache
 * the previous lookup to optimize swithing between two
 * channels--as happens with dynamic turbo.
 */
struct ieee80211_channel *
ieee80211_find_channel(ieee80211com_t *ic, int freq, int flags)
{
    struct ieee80211_channel *c;
    int i;

    flags &= IEEE80211_CHAN_ALLTURBO;
    /* brute force search */
    for (i = 0; i < IEEE80211_CHAN_MAX; i++) {
        c = &ic->ic_sup_channels[i];
        if (c->ich_freq == freq &&
            (c->ich_flags & IEEE80211_CHAN_ALLTURBO) == flags)
            return (c);
    }
    return (NULL);
}

/*
 * Return the size of the 802.11 header for a management or data frame.
 */
int
ieee80211_hdrsize(const void *data)
{
    const struct ieee80211_frame *wh = data;
    int size = sizeof (struct ieee80211_frame);

    /* NB: we don't handle control frames */
    ASSERT((wh->i_fc[0]&IEEE80211_FC0_TYPE_MASK) !=
        IEEE80211_FC0_TYPE_CTL);
    if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS)
        size += IEEE80211_ADDR_LEN;
    if (IEEE80211_QOS_HAS_SEQ(wh))
        size += sizeof (uint16_t);

    return (size);
}

/*
 * Return the space occupied by the 802.11 header and any
 * padding required by the driver.  This works for a
 * management or data frame.
 */
int
ieee80211_hdrspace(ieee80211com_t *ic, const void *data)
{
    int size = ieee80211_hdrsize(data);
    if (ic->ic_flags & IEEE80211_F_DATAPAD)
        size = roundup(size, sizeof (uint32_t));
    return (size);
}

/*
 * Like ieee80211_hdrsize, but handles any type of frame.
 */
int
ieee80211_anyhdrsize(const void *data)
{
    const struct ieee80211_frame *wh = data;

    if ((wh->i_fc[0]&IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) {
        switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) {
        case IEEE80211_FC0_SUBTYPE_CTS:
        case IEEE80211_FC0_SUBTYPE_ACK:
            return (sizeof (struct ieee80211_frame_ack));
        case IEEE80211_FC0_SUBTYPE_BAR:
            return (sizeof (struct ieee80211_frame_bar));
        }
        return (sizeof (struct ieee80211_frame_min));
    } else
        return (ieee80211_hdrsize(data));
}

/*
 * Like ieee80211_hdrspace, but handles any type of frame.
 */
int
ieee80211_anyhdrspace(ieee80211com_t *ic, const void *data)
{
    int size = ieee80211_anyhdrsize(data);
    if (ic->ic_flags & IEEE80211_F_DATAPAD)
        size = roundup(size, sizeof (uint32_t));
    return (size);
}

/*
 * Allocate and setup a management frame of the specified
 * size.  We return the mblk and a pointer to the start
 * of the contiguous data area that's been reserved based
 * on the packet length.
 */
mblk_t *
ieee80211_getmgtframe(uint8_t **frm, int pktlen)
{
    mblk_t *mp;
    int len;

    len = sizeof (struct ieee80211_frame) + pktlen;
    mp = allocb(len, BPRI_MED);
    if (mp != NULL) {
        *frm = mp->b_rptr + sizeof (struct ieee80211_frame);
        mp->b_wptr = mp->b_rptr + len;
    } else {
        ieee80211_err("ieee80211_getmgtframe: "
            "alloc frame failed, %d\n", len);
    }
    return (mp);
}

/*
 * Send system messages to notify the device has joined a WLAN.
 * This is an OS specific function. Solaris marks link status
 * as up.
 */
void
ieee80211_notify_node_join(ieee80211com_t *ic, ieee80211_node_t *in)
{
    if (in == ic->ic_bss)
        mac_link_update(ic->ic_mach, LINK_STATE_UP);
    ieee80211_notify(ic, EVENT_ASSOC);  /* notify WPA service */
}

/*
 * Send system messages to notify the device has left a WLAN.
 * This is an OS specific function. Solaris marks link status
 * as down.
 */
void
ieee80211_notify_node_leave(ieee80211com_t *ic, ieee80211_node_t *in)
{
    if (in == ic->ic_bss)
        mac_link_update(ic->ic_mach, LINK_STATE_DOWN);
    ieee80211_notify(ic, EVENT_DISASSOC);   /* notify WPA service */
}


/*
 * Get 802.11 kstats defined in ieee802.11(5)
 *
 * Return 0 on success
 */
int
ieee80211_stat(ieee80211com_t *ic, uint_t stat, uint64_t *val)
{
    ASSERT(val != NULL);
    IEEE80211_LOCK(ic);
    switch (stat) {
    case WIFI_STAT_TX_FRAGS:
        *val = ic->ic_stats.is_tx_frags;
        break;
    case WIFI_STAT_MCAST_TX:
        *val = ic->ic_stats.is_tx_mcast;
        break;
    case WIFI_STAT_TX_FAILED:
        *val = ic->ic_stats.is_tx_failed;
        break;
    case WIFI_STAT_TX_RETRANS:
        *val = ic->ic_stats.is_tx_retries;
        break;
    case WIFI_STAT_RTS_SUCCESS:
        *val = ic->ic_stats.is_rts_success;
        break;
    case WIFI_STAT_RTS_FAILURE:
        *val = ic->ic_stats.is_rts_failure;
        break;
    case WIFI_STAT_ACK_FAILURE:
        *val = ic->ic_stats.is_ack_failure;
        break;
    case WIFI_STAT_RX_FRAGS:
        *val = ic->ic_stats.is_rx_frags;
        break;
    case WIFI_STAT_MCAST_RX:
        *val = ic->ic_stats.is_rx_mcast;
        break;
    case WIFI_STAT_RX_DUPS:
        *val = ic->ic_stats.is_rx_dups;
        break;
    case WIFI_STAT_FCS_ERRORS:
        *val = ic->ic_stats.is_fcs_errors;
        break;
    case WIFI_STAT_WEP_ERRORS:
        *val = ic->ic_stats.is_wep_errors;
        break;
    }
    IEEE80211_UNLOCK(ic);
    return (0);
}

/*
 * Attach network interface to the 802.11 support module. This
 * function must be called before using any of the ieee80211
 * functionss. The parameter "ic" MUST be initialized to tell
 * net80211 about interface's capabilities.
 */
void
ieee80211_attach(ieee80211com_t *ic)
{
    struct ieee80211_impl       *im;
    struct ieee80211_channel    *ch;
    int             i;

    /* Check mandatory callback functions not NULL */
    ASSERT(ic->ic_xmit != NULL);

    mutex_init(&ic->ic_genlock, NULL, MUTEX_DRIVER, NULL);
    mutex_init(&ic->ic_doorlock, NULL, MUTEX_DRIVER, NULL);

    im = kmem_alloc(sizeof (ieee80211_impl_t), KM_SLEEP);
    ic->ic_private = im;
    cv_init(&im->im_scan_cv, NULL, CV_DRIVER, NULL);

    /*
     * Fill in 802.11 available channel set, mark
     * all available channels as active, and pick
     * a default channel if not already specified.
     */
    bzero(im->im_chan_avail, sizeof (im->im_chan_avail));
    ic->ic_modecaps |= 1 << IEEE80211_MODE_AUTO;
    for (i = 0; i <= IEEE80211_CHAN_MAX; i++) {
        ch = &ic->ic_sup_channels[i];
        if (ch->ich_flags) {
            /* Verify driver passed us valid data */
            if (i != ieee80211_chan2ieee(ic, ch)) {
                ieee80211_err("bad channel ignored: "
                    "freq %u flags%x number %u\n",
                    ch->ich_freq, ch->ich_flags, i);
                ch->ich_flags = 0;
                continue;
            }
            ieee80211_setbit(im->im_chan_avail, i);
            /* Identify mode capabilities */
            if (IEEE80211_IS_CHAN_A(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_11A;
            if (IEEE80211_IS_CHAN_B(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_11B;
            if (IEEE80211_IS_CHAN_PUREG(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_11G;
            if (IEEE80211_IS_CHAN_FHSS(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_FH;
            if (IEEE80211_IS_CHAN_T(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_TURBO_A;
            if (IEEE80211_IS_CHAN_108G(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_TURBO_G;
            if (IEEE80211_IS_CHAN_ST(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_STURBO_A;
            if (IEEE80211_IS_CHAN_HTA(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_11NA;
            if (IEEE80211_IS_CHAN_HTG(ch))
                ic->ic_modecaps |= 1 << IEEE80211_MODE_11NG;
            if (ic->ic_curchan == NULL) {
                /* arbitrarily pick the first channel */
                ic->ic_curchan = &ic->ic_sup_channels[i];
            }
        }
    }
    /* validate ic->ic_curmode */
    if ((ic->ic_modecaps & (1 << ic->ic_curmode)) == 0)
        ic->ic_curmode = IEEE80211_MODE_AUTO;
    ic->ic_des_chan = IEEE80211_CHAN_ANYC;  /* any channel is ok */
    (void) ieee80211_setmode(ic, ic->ic_curmode);

    if (ic->ic_caps & IEEE80211_C_WME)  /* enable if capable */
        ic->ic_flags |= IEEE80211_F_WME;
    if (ic->ic_caps & IEEE80211_C_BURST)
        ic->ic_flags |= IEEE80211_F_BURST;
    ic->ic_bintval = IEEE80211_BINTVAL_DEFAULT;
    ic->ic_lintval = ic->ic_bintval;
    ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
    ic->ic_bmissthreshold = IEEE80211_HWBMISS_DEFAULT;

    ic->ic_reset = ieee80211_default_reset;

    ieee80211_node_attach(ic);
    ieee80211_proto_attach(ic);
    ieee80211_crypto_attach(ic);
    ieee80211_ht_attach(ic);

    ic->ic_watchdog_timer = 0;
}

/*
 * Free any ieee80211 structures associated with the driver.
 */
void
ieee80211_detach(ieee80211com_t *ic)
{
    struct ieee80211_impl *im = ic->ic_private;

    ieee80211_stop_watchdog(ic);
    cv_destroy(&im->im_scan_cv);
    kmem_free(im, sizeof (ieee80211_impl_t));

    if (ic->ic_opt_ie != NULL)
        ieee80211_free(ic->ic_opt_ie);

    ieee80211_ht_detach(ic);
    ieee80211_node_detach(ic);
    ieee80211_crypto_detach(ic);

    mutex_destroy(&ic->ic_genlock);
    mutex_destroy(&ic->ic_doorlock);
}

static struct modlmisc  i_wifi_modlmisc = {
    &mod_miscops,
    "IEEE80211 Kernel Module v2.0"
};

static struct modlinkage    i_wifi_modlinkage = {
    MODREV_1,
    &i_wifi_modlmisc,
    NULL
};

/*
 * modlinkage functions
 */
int
_init(void)
{
    return (mod_install(&i_wifi_modlinkage));
}

int
_fini(void)
{
    return (mod_remove(&i_wifi_modlinkage));
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&i_wifi_modlinkage, modinfop));
}