rtllib_softmac_wx.c

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/* IEEE 802.11 SoftMAC layer
 * Copyright (c) 2005 Andrea Merello <[email protected]>
 *
 * Mostly extracted from the rtl8180-sa2400 driver for the
 * in-kernel generic ieee802.11 stack.
 *
 * Some pieces of code might be stolen from ipw2100 driver
 * copyright of who own it's copyright ;-)
 *
 * PS wx handler mostly stolen from hostap, copyright who
 * own it's copyright ;-)
 *
 * released under the GPL
 */


#include <linux/etherdevice.h>

#include "rtllib.h"
#include "dot11d.h"
/* FIXME: add A freqs */

const long rtllib_wlan_frequencies[] = {
    2412, 2417, 2422, 2427,
    2432, 2437, 2442, 2447,
    2452, 2457, 2462, 2467,
    2472, 2484
};
EXPORT_SYMBOL(rtllib_wlan_frequencies);


int rtllib_wx_set_freq(struct rtllib_device *ieee, struct iw_request_info *a,
                 union iwreq_data *wrqu, char *b)
{
    int ret;
    struct iw_freq *fwrq = &wrqu->freq;

    down(&ieee->wx_sem);

    if (ieee->iw_mode == IW_MODE_INFRA) {
        ret = 0;
        goto out;
    }

    /* if setting by freq convert to channel */
    if (fwrq->e == 1) {
        if ((fwrq->m >= (int) 2.412e8 &&
             fwrq->m <= (int) 2.487e8)) {
            int f = fwrq->m / 100000;
            int c = 0;

            while ((c < 14) && (f != rtllib_wlan_frequencies[c]))
                c++;

            /* hack to fall through */
            fwrq->e = 0;
            fwrq->m = c + 1;
        }
    }

    if (fwrq->e > 0 || fwrq->m > 14 || fwrq->m < 1) {
        ret = -EOPNOTSUPP;
        goto out;

    } else { /* Set the channel */

        if (ieee->active_channel_map[fwrq->m] != 1) {
            ret = -EINVAL;
            goto out;
        }
        ieee->current_network.channel = fwrq->m;
        ieee->set_chan(ieee->dev, ieee->current_network.channel);

        if (ieee->iw_mode == IW_MODE_ADHOC ||
            ieee->iw_mode == IW_MODE_MASTER)
            if (ieee->state == RTLLIB_LINKED) {
                rtllib_stop_send_beacons(ieee);
                rtllib_start_send_beacons(ieee);
            }
    }

    ret = 0;
out:
    up(&ieee->wx_sem);
    return ret;
}
EXPORT_SYMBOL(rtllib_wx_set_freq);


int rtllib_wx_get_freq(struct rtllib_device *ieee,
                 struct iw_request_info *a,
                 union iwreq_data *wrqu, char *b)
{
    struct iw_freq *fwrq = &wrqu->freq;

    if (ieee->current_network.channel == 0)
        return -1;
    fwrq->m = rtllib_wlan_frequencies[ieee->current_network.channel-1] *
          100000;
    fwrq->e = 1;
    return 0;
}
EXPORT_SYMBOL(rtllib_wx_get_freq);

int rtllib_wx_get_wap(struct rtllib_device *ieee,
                struct iw_request_info *info,
                union iwreq_data *wrqu, char *extra)
{
    unsigned long flags;

    wrqu->ap_addr.sa_family = ARPHRD_ETHER;

    if (ieee->iw_mode == IW_MODE_MONITOR)
        return -1;

    /* We want avoid to give to the user inconsistent infos*/
    spin_lock_irqsave(&ieee->lock, flags);

    if (ieee->state != RTLLIB_LINKED &&
        ieee->state != RTLLIB_LINKED_SCANNING &&
        ieee->wap_set == 0)

        memset(wrqu->ap_addr.sa_data, 0, ETH_ALEN);
    else
        memcpy(wrqu->ap_addr.sa_data,
               ieee->current_network.bssid, ETH_ALEN);

    spin_unlock_irqrestore(&ieee->lock, flags);

    return 0;
}
EXPORT_SYMBOL(rtllib_wx_get_wap);


int rtllib_wx_set_wap(struct rtllib_device *ieee,
             struct iw_request_info *info,
             union iwreq_data *awrq,
             char *extra)
{

    int ret = 0;
    unsigned long flags;

    short ifup = ieee->proto_started;
    struct sockaddr *temp = (struct sockaddr *)awrq;

    rtllib_stop_scan_syncro(ieee);

    down(&ieee->wx_sem);
    /* use ifconfig hw ether */
    if (ieee->iw_mode == IW_MODE_MASTER) {
        ret = -1;
        goto out;
    }

    if (temp->sa_family != ARPHRD_ETHER) {
        ret = -EINVAL;
        goto out;
    }

    if (is_zero_ether_addr(temp->sa_data)) {
        spin_lock_irqsave(&ieee->lock, flags);
        memcpy(ieee->current_network.bssid, temp->sa_data, ETH_ALEN);
        ieee->wap_set = 0;
        spin_unlock_irqrestore(&ieee->lock, flags);
        ret = -1;
        goto out;
    }


    if (ifup)
        rtllib_stop_protocol(ieee, true);

    /* just to avoid to give inconsistent infos in the
     * get wx method. not really needed otherwise
     */
    spin_lock_irqsave(&ieee->lock, flags);

    ieee->cannot_notify = false;
    memcpy(ieee->current_network.bssid, temp->sa_data, ETH_ALEN);
    ieee->wap_set = !is_zero_ether_addr(temp->sa_data);

    spin_unlock_irqrestore(&ieee->lock, flags);

    if (ifup)
        rtllib_start_protocol(ieee);
out:
    up(&ieee->wx_sem);
    return ret;
}
EXPORT_SYMBOL(rtllib_wx_set_wap);

int rtllib_wx_get_essid(struct rtllib_device *ieee, struct iw_request_info *a,
             union iwreq_data *wrqu, char *b)
{
    int len, ret = 0;
    unsigned long flags;

    if (ieee->iw_mode == IW_MODE_MONITOR)
        return -1;

    /* We want avoid to give to the user inconsistent infos*/
    spin_lock_irqsave(&ieee->lock, flags);

    if (ieee->current_network.ssid[0] == '\0' ||
        ieee->current_network.ssid_len == 0) {
        ret = -1;
        goto out;
    }

    if (ieee->state != RTLLIB_LINKED &&
        ieee->state != RTLLIB_LINKED_SCANNING &&
        ieee->ssid_set == 0) {
        ret = -1;
        goto out;
    }
    len = ieee->current_network.ssid_len;
    wrqu->essid.length = len;
    strncpy(b, ieee->current_network.ssid, len);
    wrqu->essid.flags = 1;

out:
    spin_unlock_irqrestore(&ieee->lock, flags);

    return ret;

}
EXPORT_SYMBOL(rtllib_wx_get_essid);

int rtllib_wx_set_rate(struct rtllib_device *ieee,
                 struct iw_request_info *info,
                 union iwreq_data *wrqu, char *extra)
{

    u32 target_rate = wrqu->bitrate.value;

    ieee->rate = target_rate/100000;
    return 0;
}
EXPORT_SYMBOL(rtllib_wx_set_rate);

int rtllib_wx_get_rate(struct rtllib_device *ieee,
                 struct iw_request_info *info,
                 union iwreq_data *wrqu, char *extra)
{
    u32 tmp_rate = 0;
    tmp_rate = TxCountToDataRate(ieee,
                     ieee->softmac_stats.CurrentShowTxate);
    wrqu->bitrate.value = tmp_rate * 500000;

    return 0;
}
EXPORT_SYMBOL(rtllib_wx_get_rate);


int rtllib_wx_set_rts(struct rtllib_device *ieee,
                 struct iw_request_info *info,
                 union iwreq_data *wrqu, char *extra)
{
    if (wrqu->rts.disabled || !wrqu->rts.fixed)
        ieee->rts = DEFAULT_RTS_THRESHOLD;
    else {
        if (wrqu->rts.value < MIN_RTS_THRESHOLD ||
                wrqu->rts.value > MAX_RTS_THRESHOLD)
            return -EINVAL;
        ieee->rts = wrqu->rts.value;
    }
    return 0;
}
EXPORT_SYMBOL(rtllib_wx_set_rts);

int rtllib_wx_get_rts(struct rtllib_device *ieee,
                 struct iw_request_info *info,
                 union iwreq_data *wrqu, char *extra)
{
    wrqu->rts.value = ieee->rts;
    wrqu->rts.fixed = 0;    /* no auto select */
    wrqu->rts.disabled = (wrqu->rts.value == DEFAULT_RTS_THRESHOLD);
    return 0;
}
EXPORT_SYMBOL(rtllib_wx_get_rts);

int rtllib_wx_set_mode(struct rtllib_device *ieee, struct iw_request_info *a,
                 union iwreq_data *wrqu, char *b)
{
    int set_mode_status = 0;

    rtllib_stop_scan_syncro(ieee);
    down(&ieee->wx_sem);
    switch (wrqu->mode) {
    case IW_MODE_MONITOR:
    case IW_MODE_ADHOC:
    case IW_MODE_INFRA:
        break;
    case IW_MODE_AUTO:
        wrqu->mode = IW_MODE_INFRA;
        break;
    default:
        set_mode_status = -EINVAL;
        goto out;
    }

    if (wrqu->mode == ieee->iw_mode)
        goto out;

    if (wrqu->mode == IW_MODE_MONITOR) {
        ieee->dev->type = ARPHRD_IEEE80211;
        rtllib_EnableNetMonitorMode(ieee->dev, false);
    } else {
        ieee->dev->type = ARPHRD_ETHER;
        if (ieee->iw_mode == IW_MODE_MONITOR)
            rtllib_DisableNetMonitorMode(ieee->dev, false);
    }

    if (!ieee->proto_started) {
        ieee->iw_mode = wrqu->mode;
    } else {
        rtllib_stop_protocol(ieee, true);
        ieee->iw_mode = wrqu->mode;
        rtllib_start_protocol(ieee);
    }

out:
    up(&ieee->wx_sem);
    return set_mode_status;
}
EXPORT_SYMBOL(rtllib_wx_set_mode);

void rtllib_wx_sync_scan_wq(void *data)
{
    struct rtllib_device *ieee = container_of_work_rsl(data,
                     struct rtllib_device, wx_sync_scan_wq);
    short chan;
    enum ht_extchnl_offset chan_offset = 0;
    enum ht_channel_width bandwidth = 0;
    int b40M = 0;
    static int count;

    if (!(ieee->softmac_features & IEEE_SOFTMAC_SCAN)) {
        rtllib_start_scan_syncro(ieee, 0);
        goto out;
    }

    chan = ieee->current_network.channel;

    if (ieee->LeisurePSLeave)
        ieee->LeisurePSLeave(ieee->dev);
    /* notify AP to be in PS mode */
    rtllib_sta_ps_send_null_frame(ieee, 1);
    rtllib_sta_ps_send_null_frame(ieee, 1);

    rtllib_stop_all_queues(ieee);

    if (ieee->data_hard_stop)
        ieee->data_hard_stop(ieee->dev);
    rtllib_stop_send_beacons(ieee);
    ieee->state = RTLLIB_LINKED_SCANNING;
    ieee->link_change(ieee->dev);
    /* wait for ps packet to be kicked out successfully */
    msleep(50);

    if (ieee->ScanOperationBackupHandler)
        ieee->ScanOperationBackupHandler(ieee->dev, SCAN_OPT_BACKUP);

    if (ieee->pHTInfo->bCurrentHTSupport && ieee->pHTInfo->bEnableHT &&
        ieee->pHTInfo->bCurBW40MHz) {
        b40M = 1;
        chan_offset = ieee->pHTInfo->CurSTAExtChnlOffset;
        bandwidth = (enum ht_channel_width)ieee->pHTInfo->bCurBW40MHz;
        RT_TRACE(COMP_DBG, "Scan in 40M, force to 20M first:%d, %d\n",
             chan_offset, bandwidth);
        ieee->SetBWModeHandler(ieee->dev, HT_CHANNEL_WIDTH_20,
                       HT_EXTCHNL_OFFSET_NO_EXT);
    }

    rtllib_start_scan_syncro(ieee, 0);

    if (b40M) {
        RT_TRACE(COMP_DBG, "Scan in 20M, back to 40M\n");
        if (chan_offset == HT_EXTCHNL_OFFSET_UPPER)
            ieee->set_chan(ieee->dev, chan + 2);
        else if (chan_offset == HT_EXTCHNL_OFFSET_LOWER)
            ieee->set_chan(ieee->dev, chan - 2);
        else
            ieee->set_chan(ieee->dev, chan);
        ieee->SetBWModeHandler(ieee->dev, bandwidth, chan_offset);
    } else {
        ieee->set_chan(ieee->dev, chan);
    }

    if (ieee->ScanOperationBackupHandler)
        ieee->ScanOperationBackupHandler(ieee->dev, SCAN_OPT_RESTORE);

    ieee->state = RTLLIB_LINKED;
    ieee->link_change(ieee->dev);

    /* Notify AP that I wake up again */
    rtllib_sta_ps_send_null_frame(ieee, 0);

    if (ieee->LinkDetectInfo.NumRecvBcnInPeriod == 0 ||
        ieee->LinkDetectInfo.NumRecvDataInPeriod == 0) {
        ieee->LinkDetectInfo.NumRecvBcnInPeriod = 1;
        ieee->LinkDetectInfo.NumRecvDataInPeriod = 1;
    }

    if (ieee->data_hard_resume)
        ieee->data_hard_resume(ieee->dev);

    if (ieee->iw_mode == IW_MODE_ADHOC || ieee->iw_mode == IW_MODE_MASTER)
        rtllib_start_send_beacons(ieee);

    rtllib_wake_all_queues(ieee);

    count = 0;
out:
    up(&ieee->wx_sem);

}

int rtllib_wx_set_scan(struct rtllib_device *ieee, struct iw_request_info *a,
                 union iwreq_data *wrqu, char *b)
{
    int ret = 0;

    down(&ieee->wx_sem);

    if (ieee->iw_mode == IW_MODE_MONITOR || !(ieee->proto_started)) {
        ret = -1;
        goto out;
    }

    if (ieee->state == RTLLIB_LINKED) {
        queue_work_rsl(ieee->wq, &ieee->wx_sync_scan_wq);
        /* intentionally forget to up sem */
        return 0;
    }

out:
    up(&ieee->wx_sem);
    return ret;
}
EXPORT_SYMBOL(rtllib_wx_set_scan);

int rtllib_wx_set_essid(struct rtllib_device *ieee,
            struct iw_request_info *a,
            union iwreq_data *wrqu, char *extra)
{

    int ret = 0, len, i;
    short proto_started;
    unsigned long flags;

    rtllib_stop_scan_syncro(ieee);
    down(&ieee->wx_sem);

    proto_started = ieee->proto_started;

    len = (wrqu->essid.length < IW_ESSID_MAX_SIZE) ? wrqu->essid.length :
           IW_ESSID_MAX_SIZE;

    if (len > IW_ESSID_MAX_SIZE) {
        ret = -E2BIG;
        goto out;
    }

    if (ieee->iw_mode == IW_MODE_MONITOR) {
        ret = -1;
        goto out;
    }

    for (i = 0; i < len; i++) {
        if (extra[i] < 0) {
            ret = -1;
            goto out;
        }
    }

    if (proto_started)
        rtllib_stop_protocol(ieee, true);


    /* this is just to be sure that the GET wx callback
     * has consistent infos. not needed otherwise
     */
    spin_lock_irqsave(&ieee->lock, flags);

    if (wrqu->essid.flags && wrqu->essid.length) {
        strncpy(ieee->current_network.ssid, extra, len);
        ieee->current_network.ssid_len = len;
        ieee->cannot_notify = false;
        ieee->ssid_set = 1;
    } else {
        ieee->ssid_set = 0;
        ieee->current_network.ssid[0] = '\0';
        ieee->current_network.ssid_len = 0;
    }
    spin_unlock_irqrestore(&ieee->lock, flags);

    if (proto_started)
        rtllib_start_protocol(ieee);
out:
    up(&ieee->wx_sem);
    return ret;
}
EXPORT_SYMBOL(rtllib_wx_set_essid);

int rtllib_wx_get_mode(struct rtllib_device *ieee, struct iw_request_info *a,
               union iwreq_data *wrqu, char *b)
{
    wrqu->mode = ieee->iw_mode;
    return 0;
}
EXPORT_SYMBOL(rtllib_wx_get_mode);

int rtllib_wx_set_rawtx(struct rtllib_device *ieee,
            struct iw_request_info *info,
            union iwreq_data *wrqu, char *extra)
{

    int *parms = (int *)extra;
    int enable = (parms[0] > 0);
    short prev = ieee->raw_tx;

    down(&ieee->wx_sem);

    if (enable)
        ieee->raw_tx = 1;
    else
        ieee->raw_tx = 0;

    printk(KERN_INFO"raw TX is %s\n",
          ieee->raw_tx ? "enabled" : "disabled");

    if (ieee->iw_mode == IW_MODE_MONITOR) {
        if (prev == 0 && ieee->raw_tx) {
            if (ieee->data_hard_resume)
                ieee->data_hard_resume(ieee->dev);

            netif_carrier_on(ieee->dev);
        }

        if (prev && ieee->raw_tx == 1)
            netif_carrier_off(ieee->dev);
    }

    up(&ieee->wx_sem);

    return 0;
}
EXPORT_SYMBOL(rtllib_wx_set_rawtx);

int rtllib_wx_get_name(struct rtllib_device *ieee,
                 struct iw_request_info *info,
                 union iwreq_data *wrqu, char *extra)
{
    strcpy(wrqu->name, "802.11");

    if (ieee->modulation & RTLLIB_CCK_MODULATION)
        strcat(wrqu->name, "b");
    if (ieee->modulation & RTLLIB_OFDM_MODULATION)
        strcat(wrqu->name, "g");
    if (ieee->mode & (IEEE_N_24G | IEEE_N_5G))
        strcat(wrqu->name, "n");
    return 0;
}
EXPORT_SYMBOL(rtllib_wx_get_name);


/* this is mostly stolen from hostap */
int rtllib_wx_set_power(struct rtllib_device *ieee,
                 struct iw_request_info *info,
                 union iwreq_data *wrqu, char *extra)
{
    int ret = 0;

    if ((!ieee->sta_wake_up) ||
        (!ieee->enter_sleep_state) ||
        (!ieee->ps_is_queue_empty)) {
        RTLLIB_DEBUG(RTLLIB_DL_ERR, "%s(): PS mode is tried to be use "
                 "but driver missed a callback\n\n", __func__);
        return -1;
    }

    down(&ieee->wx_sem);

    if (wrqu->power.disabled) {
        RT_TRACE(COMP_DBG, "===>%s(): power disable\n", __func__);
        ieee->ps = RTLLIB_PS_DISABLED;
        goto exit;
    }
    if (wrqu->power.flags & IW_POWER_TIMEOUT) {
        ieee->ps_timeout = wrqu->power.value / 1000;
        RT_TRACE(COMP_DBG, "===>%s():ps_timeout is %d\n", __func__,
             ieee->ps_timeout);
    }

    if (wrqu->power.flags & IW_POWER_PERIOD)
        ieee->ps_period = wrqu->power.value / 1000;

    switch (wrqu->power.flags & IW_POWER_MODE) {
    case IW_POWER_UNICAST_R:
        ieee->ps = RTLLIB_PS_UNICAST;
        break;
    case IW_POWER_MULTICAST_R:
        ieee->ps = RTLLIB_PS_MBCAST;
        break;
    case IW_POWER_ALL_R:
        ieee->ps = RTLLIB_PS_UNICAST | RTLLIB_PS_MBCAST;
        break;

    case IW_POWER_ON:
        break;

    default:
        ret = -EINVAL;
        goto exit;

    }
exit:
    up(&ieee->wx_sem);
    return ret;

}
EXPORT_SYMBOL(rtllib_wx_set_power);

/* this is stolen from hostap */
int rtllib_wx_get_power(struct rtllib_device *ieee,
                 struct iw_request_info *info,
                 union iwreq_data *wrqu, char *extra)
{
    int ret = 0;

    down(&ieee->wx_sem);

    if (ieee->ps == RTLLIB_PS_DISABLED) {
        wrqu->power.disabled = 1;
        goto exit;
    }

    wrqu->power.disabled = 0;

    if ((wrqu->power.flags & IW_POWER_TYPE) == IW_POWER_TIMEOUT) {
        wrqu->power.flags = IW_POWER_TIMEOUT;
        wrqu->power.value = ieee->ps_timeout * 1000;
    } else {
        wrqu->power.flags = IW_POWER_PERIOD;
        wrqu->power.value = ieee->ps_period * 1000;
    }

    if ((ieee->ps & (RTLLIB_PS_MBCAST | RTLLIB_PS_UNICAST)) ==
        (RTLLIB_PS_MBCAST | RTLLIB_PS_UNICAST))
        wrqu->power.flags |= IW_POWER_ALL_R;
    else if (ieee->ps & RTLLIB_PS_MBCAST)
        wrqu->power.flags |= IW_POWER_MULTICAST_R;
    else
        wrqu->power.flags |= IW_POWER_UNICAST_R;

exit:
    up(&ieee->wx_sem);
    return ret;

}
EXPORT_SYMBOL(rtllib_wx_get_power);