drivers/net/wireless/mwifiex/uap_event.c

   1 /*
   2  * Marvell Wireless LAN device driver: AP event handling
   3  *
   4  * Copyright (C) 2012, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "main.h"
  22 #include "11n.h"
  23
  24 /*
  25  * This function will return the pointer to station entry in station list
  26  * table which matches specified mac address.
  27  * This function should be called after acquiring RA list spinlock.
  28  * NULL is returned if station entry is not found in associated STA list.
  29  */
  30 struct mwifiex_sta_node *
  31 mwifiex_get_sta_entry(struct mwifiex_private *priv, u8 *mac)
  32 {
  33         struct mwifiex_sta_node *node;
  34
  35         if (!mac)
  36                 return NULL;
  37
  38         list_for_each_entry(node, &priv->sta_list, list) {
  39                 if (!memcmp(node->mac_addr, mac, ETH_ALEN))
  40                         return node;
  41         }
  42
  43         return NULL;
  44 }
  45
  46 /*
  47  * This function will add a sta_node entry to associated station list
  48  * table with the given mac address.
  49  * If entry exist already, existing entry is returned.
  50  * If received mac address is NULL, NULL is returned.
  51  */
  52 static struct mwifiex_sta_node *
  53 mwifiex_add_sta_entry(struct mwifiex_private *priv, u8 *mac)
  54 {
  55         struct mwifiex_sta_node *node;
  56         unsigned long flags;
  57
  58         if (!mac)
  59                 return NULL;
  60
  61         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
  62         node = mwifiex_get_sta_entry(priv, mac);
  63         if (node)
  64                 goto done;
  65
  66         node = kzalloc(sizeof(struct mwifiex_sta_node), GFP_ATOMIC);
  67         if (!node)
  68                 goto done;
  69
  70         memcpy(node->mac_addr, mac, ETH_ALEN);
  71         list_add_tail(&node->list, &priv->sta_list);
  72
  73 done:
  74         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
  75         return node;
  76 }
  77
  78 /*
  79  * This function will search for HT IE in association request IEs
  80  * and set station HT parameters accordingly.
  81  */
  82 static void
  83 mwifiex_set_sta_ht_cap(struct mwifiex_private *priv, const u8 *ies,
  84                        int ies_len, struct mwifiex_sta_node *node)
  85 {
  86         const struct ieee80211_ht_cap *ht_cap;
  87
  88         if (!ies)
  89                 return;
  90
  91         ht_cap = (void *)cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies, ies_len);
  92         if (ht_cap) {
  93                 node->is_11n_enabled = 1;
  94                 node->max_amsdu = le16_to_cpu(ht_cap->cap_info) &
  95                                   IEEE80211_HT_CAP_MAX_AMSDU ?
  96                                   MWIFIEX_TX_DATA_BUF_SIZE_8K :
  97                                   MWIFIEX_TX_DATA_BUF_SIZE_4K;
  98         } else {
  99                 node->is_11n_enabled = 0;
 100         }
 101
 102         return;
 103 }
 104
 105 /*
 106  * This function will delete a station entry from station list
 107  */
 108 static void mwifiex_del_sta_entry(struct mwifiex_private *priv, u8 *mac)
 109 {
 110         struct mwifiex_sta_node *node, *tmp;
 111         unsigned long flags;
 112
 113         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 114
 115         node = mwifiex_get_sta_entry(priv, mac);
 116         if (node) {
 117                 list_for_each_entry_safe(node, tmp, &priv->sta_list,
 118                                          list) {
 119                         list_del(&node->list);
 120                         kfree(node);
 121                 }
 122         }
 123
 124         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 125         return;
 126 }
 127
 128 /*
 129  * This function will delete all stations from associated station list.
 130  */
 131 static void mwifiex_del_all_sta_list(struct mwifiex_private *priv)
 132 {
 133         struct mwifiex_sta_node *node, *tmp;
 134         unsigned long flags;
 135
 136         spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 137
 138         list_for_each_entry_safe(node, tmp, &priv->sta_list, list) {
 139                 list_del(&node->list);
 140                 kfree(node);
 141         }
 142
 143         INIT_LIST_HEAD(&priv->sta_list);
 144         spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 145         return;
 146 }
 147
 148 /*
 149  * This function handles AP interface specific events generated by firmware.
 150  *
 151  * Event specific routines are called by this function based
 152  * upon the generated event cause.
 153  *
 154  *
 155  * Events supported for AP -
 156  *      - EVENT_UAP_STA_ASSOC
 157  *      - EVENT_UAP_STA_DEAUTH
 158  *      - EVENT_UAP_BSS_ACTIVE
 159  *      - EVENT_UAP_BSS_START
 160  *      - EVENT_UAP_BSS_IDLE
 161  *      - EVENT_UAP_MIC_COUNTERMEASURES:
 162  */
 163 int mwifiex_process_uap_event(struct mwifiex_private *priv)
 164 {
 165         struct mwifiex_adapter *adapter = priv->adapter;
 166         int len, i;
 167         u32 eventcause = adapter->event_cause;
 168         struct station_info sinfo;
 169         struct mwifiex_assoc_event *event;
 170         struct mwifiex_sta_node *node;
 171         u8 *deauth_mac;
 172         struct host_cmd_ds_11n_batimeout *ba_timeout;
 173         u16 ctrl;
 174
 175         switch (eventcause) {
 176         case EVENT_UAP_STA_ASSOC:
 177                 memset(&sinfo, 0, sizeof(sinfo));
 178                 event = (struct mwifiex_assoc_event *)
 179                         (adapter->event_body + MWIFIEX_UAP_EVENT_EXTRA_HEADER);
 180                 if (le16_to_cpu(event->type) == TLV_TYPE_UAP_MGMT_FRAME) {
 181                         len = -1;
 182
 183                         if (ieee80211_is_assoc_req(event->frame_control))
 184                                 len = 0;
 185                         else if (ieee80211_is_reassoc_req(event->frame_control))
 186                                 /* There will be ETH_ALEN bytes of
 187                                  * current_ap_addr before the re-assoc ies.
 188                                  */
 189                                 len = ETH_ALEN;
 190
 191                         if (len != -1) {
 192                                 sinfo.filled = STATION_INFO_ASSOC_REQ_IES;
 193                                 sinfo.assoc_req_ies = &event->data[len];
 194                                 len = (u8 *)sinfo.assoc_req_ies -
 195                                       (u8 *)&event->frame_control;
 196                                 sinfo.assoc_req_ies_len =
 197                                         le16_to_cpu(event->len) - (u16)len;
 198                         }
 199                 }
 200                 cfg80211_new_sta(priv->netdev, event->sta_addr, &sinfo,
 201                                  GFP_KERNEL);
 202
 203                 node = mwifiex_add_sta_entry(priv, event->sta_addr);
 204                 if (!node) {
 205                         dev_warn(adapter->dev,
 206                                  "could not create station entry!\n");
 207                         return -1;
 208                 }
 209
 210                 if (!priv->ap_11n_enabled)
 211                         break;
 212
 213                 mwifiex_set_sta_ht_cap(priv, sinfo.assoc_req_ies,
 214                                        sinfo.assoc_req_ies_len, node);
 215
 216                 for (i = 0; i < MAX_NUM_TID; i++) {
 217                         if (node->is_11n_enabled)
 218                                 node->ampdu_sta[i] =
 219                                               priv->aggr_prio_tbl[i].ampdu_user;
 220                         else
 221                                 node->ampdu_sta[i] = BA_STREAM_NOT_ALLOWED;
 222                 }
 223                 memset(node->rx_seq, 0xff, sizeof(node->rx_seq));
 224                 break;
 225         case EVENT_UAP_STA_DEAUTH:
 226                 deauth_mac = adapter->event_body +
 227                              MWIFIEX_UAP_EVENT_EXTRA_HEADER;
 228                 cfg80211_del_sta(priv->netdev, deauth_mac, GFP_KERNEL);
 229
 230                 if (priv->ap_11n_enabled) {
 231                         mwifiex_11n_del_rx_reorder_tbl_by_ta(priv, deauth_mac);
 232                         mwifiex_del_tx_ba_stream_tbl_by_ra(priv, deauth_mac);
 233                 }
 234                 mwifiex_del_sta_entry(priv, deauth_mac);
 235                 break;
 236         case EVENT_UAP_BSS_IDLE:
 237                 priv->media_connected = false;
 238                 mwifiex_clean_txrx(priv);
 239                 mwifiex_del_all_sta_list(priv);
 240                 break;
 241         case EVENT_UAP_BSS_ACTIVE:
 242                 priv->media_connected = true;
 243                 break;
 244         case EVENT_UAP_BSS_START:
 245                 dev_dbg(adapter->dev, "AP EVENT: event id: %#x\n", eventcause);
 246                 memcpy(priv->netdev->dev_addr, adapter->event_body + 2,
 247                        ETH_ALEN);
 248                 break;
 249         case EVENT_UAP_MIC_COUNTERMEASURES:
 250                 /* For future development */
 251                 dev_dbg(adapter->dev, "AP EVENT: event id: %#x\n", eventcause);
 252                 break;
 253         case EVENT_AMSDU_AGGR_CTRL:
 254                 ctrl = le16_to_cpu(*(__le16 *)adapter->event_body);
 255                 dev_dbg(adapter->dev, "event: AMSDU_AGGR_CTRL %d\n", ctrl);
 256
 257                 if (priv->media_connected) {
 258                         adapter->tx_buf_size =
 259                                 min_t(u16, adapter->curr_tx_buf_size, ctrl);
 260                         dev_dbg(adapter->dev, "event: tx_buf_size %d\n",
 261                                 adapter->tx_buf_size);
 262                 }
 263                 break;
 264         case EVENT_ADDBA:
 265                 dev_dbg(adapter->dev, "event: ADDBA Request\n");
 266                 if (priv->media_connected)
 267                         mwifiex_send_cmd_async(priv, HostCmd_CMD_11N_ADDBA_RSP,
 268                                                HostCmd_ACT_GEN_SET, 0,
 269                                                adapter->event_body);
 270                 break;
 271         case EVENT_DELBA:
 272                 dev_dbg(adapter->dev, "event: DELBA Request\n");
 273                 if (priv->media_connected)
 274                         mwifiex_11n_delete_ba_stream(priv, adapter->event_body);
 275                 break;
 276         case EVENT_BA_STREAM_TIEMOUT:
 277                 dev_dbg(adapter->dev, "event:  BA Stream timeout\n");
 278                 if (priv->media_connected) {
 279                         ba_timeout = (void *)adapter->event_body;
 280                         mwifiex_11n_ba_stream_timeout(priv, ba_timeout);
 281                 }
 282                 break;
 283         default:
 284                 dev_dbg(adapter->dev, "event: unknown event id: %#x\n",
 285                         eventcause);
 286                 break;
 287         }
 288
 289         return 0;
 290 }