uap_event.c

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/*
 * Marvell Wireless LAN device driver: AP event handling
 *
 * Copyright (C) 2012, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "main.h"
#include "11n.h"

/*
 * This function will return the pointer to station entry in station list
 * table which matches specified mac address.
 * This function should be called after acquiring RA list spinlock.
 * NULL is returned if station entry is not found in associated STA list.
 */
struct mwifiex_sta_node *
mwifiex_get_sta_entry(struct mwifiex_private *priv, u8 *mac)
{
    struct mwifiex_sta_node *node;

    if (!mac)
        return NULL;

    list_for_each_entry(node, &priv->sta_list, list) {
        if (!memcmp(node->mac_addr, mac, ETH_ALEN))
            return node;
    }

    return NULL;
}

/*
 * This function will add a sta_node entry to associated station list
 * table with the given mac address.
 * If entry exist already, existing entry is returned.
 * If received mac address is NULL, NULL is returned.
 */
static struct mwifiex_sta_node *
mwifiex_add_sta_entry(struct mwifiex_private *priv, u8 *mac)
{
    struct mwifiex_sta_node *node;
    unsigned long flags;

    if (!mac)
        return NULL;

    spin_lock_irqsave(&priv->sta_list_spinlock, flags);
    node = mwifiex_get_sta_entry(priv, mac);
    if (node)
        goto done;

    node = kzalloc(sizeof(struct mwifiex_sta_node), GFP_ATOMIC);
    if (!node)
        goto done;

    memcpy(node->mac_addr, mac, ETH_ALEN);
    list_add_tail(&node->list, &priv->sta_list);

done:
    spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
    return node;
}

/*
 * This function will search for HT IE in association request IEs
 * and set station HT parameters accordingly.
 */
static void
mwifiex_set_sta_ht_cap(struct mwifiex_private *priv, const u8 *ies,
               int ies_len, struct mwifiex_sta_node *node)
{
    const struct ieee80211_ht_cap *ht_cap;

    if (!ies)
        return;

    ht_cap = (void *)cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies, ies_len);
    if (ht_cap) {
        node->is_11n_enabled = 1;
        node->max_amsdu = le16_to_cpu(ht_cap->cap_info) &
                  IEEE80211_HT_CAP_MAX_AMSDU ?
                  MWIFIEX_TX_DATA_BUF_SIZE_8K :
                  MWIFIEX_TX_DATA_BUF_SIZE_4K;
    } else {
        node->is_11n_enabled = 0;
    }

    return;
}

/*
 * This function will delete a station entry from station list
 */
static void mwifiex_del_sta_entry(struct mwifiex_private *priv, u8 *mac)
{
    struct mwifiex_sta_node *node, *tmp;
    unsigned long flags;

    spin_lock_irqsave(&priv->sta_list_spinlock, flags);

    node = mwifiex_get_sta_entry(priv, mac);
    if (node) {
        list_for_each_entry_safe(node, tmp, &priv->sta_list,
                     list) {
            list_del(&node->list);
            kfree(node);
        }
    }

    spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
    return;
}

/*
 * This function will delete all stations from associated station list.
 */
static void mwifiex_del_all_sta_list(struct mwifiex_private *priv)
{
    struct mwifiex_sta_node *node, *tmp;
    unsigned long flags;

    spin_lock_irqsave(&priv->sta_list_spinlock, flags);

    list_for_each_entry_safe(node, tmp, &priv->sta_list, list) {
        list_del(&node->list);
        kfree(node);
    }

    INIT_LIST_HEAD(&priv->sta_list);
    spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
    return;
}

/*
 * This function handles AP interface specific events generated by firmware.
 *
 * Event specific routines are called by this function based
 * upon the generated event cause.
 *
 *
 * Events supported for AP -
 *      - EVENT_UAP_STA_ASSOC
 *      - EVENT_UAP_STA_DEAUTH
 *      - EVENT_UAP_BSS_ACTIVE
 *      - EVENT_UAP_BSS_START
 *      - EVENT_UAP_BSS_IDLE
 *      - EVENT_UAP_MIC_COUNTERMEASURES:
 */
int mwifiex_process_uap_event(struct mwifiex_private *priv)
{
    struct mwifiex_adapter *adapter = priv->adapter;
    int len, i;
    u32 eventcause = adapter->event_cause;
    struct station_info sinfo;
    struct mwifiex_assoc_event *event;
    struct mwifiex_sta_node *node;
    u8 *deauth_mac;
    struct host_cmd_ds_11n_batimeout *ba_timeout;
    u16 ctrl;

    switch (eventcause) {
    case EVENT_UAP_STA_ASSOC:
        memset(&sinfo, 0, sizeof(sinfo));
        event = (struct mwifiex_assoc_event *)
            (adapter->event_body + MWIFIEX_UAP_EVENT_EXTRA_HEADER);
        if (le16_to_cpu(event->type) == TLV_TYPE_UAP_MGMT_FRAME) {
            len = -1;

            if (ieee80211_is_assoc_req(event->frame_control))
                len = 0;
            else if (ieee80211_is_reassoc_req(event->frame_control))
                /* There will be ETH_ALEN bytes of
                 * current_ap_addr before the re-assoc ies.
                 */
                len = ETH_ALEN;

            if (len != -1) {
                sinfo.filled = STATION_INFO_ASSOC_REQ_IES;
                sinfo.assoc_req_ies = &event->data[len];
                len = (u8 *)sinfo.assoc_req_ies -
                      (u8 *)&event->frame_control;
                sinfo.assoc_req_ies_len =
                    le16_to_cpu(event->len) - (u16)len;
            }
        }
        cfg80211_new_sta(priv->netdev, event->sta_addr, &sinfo,
                 GFP_KERNEL);

        node = mwifiex_add_sta_entry(priv, event->sta_addr);
        if (!node) {
            dev_warn(adapter->dev,
                 "could not create station entry!\n");
            return -1;
        }

        if (!priv->ap_11n_enabled)
            break;

        mwifiex_set_sta_ht_cap(priv, sinfo.assoc_req_ies,
                       sinfo.assoc_req_ies_len, node);

        for (i = 0; i < MAX_NUM_TID; i++) {
            if (node->is_11n_enabled)
                node->ampdu_sta[i] =
                          priv->aggr_prio_tbl[i].ampdu_user;
            else
                node->ampdu_sta[i] = BA_STREAM_NOT_ALLOWED;
        }
        memset(node->rx_seq, 0xff, sizeof(node->rx_seq));
        break;
    case EVENT_UAP_STA_DEAUTH:
        deauth_mac = adapter->event_body +
                 MWIFIEX_UAP_EVENT_EXTRA_HEADER;
        cfg80211_del_sta(priv->netdev, deauth_mac, GFP_KERNEL);

        if (priv->ap_11n_enabled) {
            mwifiex_11n_del_rx_reorder_tbl_by_ta(priv, deauth_mac);
            mwifiex_del_tx_ba_stream_tbl_by_ra(priv, deauth_mac);
        }
        mwifiex_del_sta_entry(priv, deauth_mac);
        break;
    case EVENT_UAP_BSS_IDLE:
        priv->media_connected = false;
        mwifiex_clean_txrx(priv);
        mwifiex_del_all_sta_list(priv);
        break;
    case EVENT_UAP_BSS_ACTIVE:
        priv->media_connected = true;
        break;
    case EVENT_UAP_BSS_START:
        dev_dbg(adapter->dev, "AP EVENT: event id: %#x\n", eventcause);
        memcpy(priv->netdev->dev_addr, adapter->event_body + 2,
               ETH_ALEN);
        break;
    case EVENT_UAP_MIC_COUNTERMEASURES:
        /* For future development */
        dev_dbg(adapter->dev, "AP EVENT: event id: %#x\n", eventcause);
        break;
    case EVENT_AMSDU_AGGR_CTRL:
        ctrl = le16_to_cpu(*(__le16 *)adapter->event_body);
        dev_dbg(adapter->dev, "event: AMSDU_AGGR_CTRL %d\n", ctrl);

        if (priv->media_connected) {
            adapter->tx_buf_size =
                min_t(u16, adapter->curr_tx_buf_size, ctrl);
            dev_dbg(adapter->dev, "event: tx_buf_size %d\n",
                adapter->tx_buf_size);
        }
        break;
    case EVENT_ADDBA:
        dev_dbg(adapter->dev, "event: ADDBA Request\n");
        if (priv->media_connected)
            mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_ADDBA_RSP,
                           HostCmd_ACT_GEN_SET, 0,
                           adapter->event_body);
        break;
    case EVENT_DELBA:
        dev_dbg(adapter->dev, "event: DELBA Request\n");
        if (priv->media_connected)
            mwifiex_11n_delete_ba_stream(priv, adapter->event_body);
        break;
    case EVENT_BA_STREAM_TIEMOUT:
        dev_dbg(adapter->dev, "event:  BA Stream timeout\n");
        if (priv->media_connected) {
            ba_timeout = (void *)adapter->event_body;
            mwifiex_11n_ba_stream_timeout(priv, ba_timeout);
        }
        break;
    default:
        dev_dbg(adapter->dev, "event: unknown event id: %#x\n",
            eventcause);
        break;
    }

    return 0;
}