drivers/staging/wilc1000/linux_mon.c

   1 /*!
   2  *  @file       linux_mon.c
   3  *  @brief      File Operations OS wrapper functionality
   4  *  @author     mdaftedar
   5  *  @sa         wilc_wfi_netdevice.h
   6  *  @date       01 MAR 2012
   7  *  @version    1.0
   8  */
   9 #include "wilc_wfi_cfgoperations.h"
  10 #include "linux_wlan_common.h"
  11 #include "wilc_wlan_if.h"
  12 #include "wilc_wlan.h"
  13
  14
  15 struct wilc_wfi_radiotap_hdr {
  16         struct ieee80211_radiotap_header hdr;
  17         u8 rate;
  18 } __attribute__((packed));
  19
  20 struct wilc_wfi_radiotap_cb_hdr {
  21         struct ieee80211_radiotap_header hdr;
  22         u8 rate;
  23         u8 dump;
  24         u16 tx_flags;
  25 } __attribute__((packed));
  26
  27 static struct net_device *wilc_wfi_mon; /* global monitor netdev */
  28
  29 static u8 srcAdd[6];
  30 static u8 bssid[6];
  31 static u8 broadcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
  32 /**
  33  *  @brief      WILC_WFI_monitor_rx
  34  *  @details
  35  *  @param[in]
  36  *  @return     int : Return 0 on Success
  37  *  @author     mdaftedar
  38  *  @date       12 JUL 2012
  39  *  @version    1.0
  40  */
  41
  42 #define IEEE80211_RADIOTAP_F_TX_RTS     0x0004  /* used rts/cts handshake */
  43 #define IEEE80211_RADIOTAP_F_TX_FAIL    0x0001  /* failed due to excessive*/
  44 #define IS_MANAGMEMENT                          0x100
  45 #define IS_MANAGMEMENT_CALLBACK                 0x080
  46 #define IS_MGMT_STATUS_SUCCES                   0x040
  47 #define GET_PKT_OFFSET(a) (((a) >> 22) & 0x1ff)
  48
  49 void WILC_WFI_monitor_rx(u8 *buff, u32 size)
  50 {
  51         u32 header, pkt_offset;
  52         struct sk_buff *skb = NULL;
  53         struct wilc_wfi_radiotap_hdr *hdr;
  54         struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
  55
  56         PRINT_INFO(HOSTAPD_DBG, "In monitor interface receive function\n");
  57
  58         if (wilc_wfi_mon == NULL)
  59                 return;
  60
  61         if (!netif_running(wilc_wfi_mon)) {
  62                 PRINT_INFO(HOSTAPD_DBG, "Monitor interface already RUNNING\n");
  63                 return;
  64         }
  65
  66         /* Get WILC header */
  67         memcpy(&header, (buff - HOST_HDR_OFFSET), HOST_HDR_OFFSET);
  68
  69         /* The packet offset field conain info about what type of managment frame */
  70         /* we are dealing with and ack status */
  71         pkt_offset = GET_PKT_OFFSET(header);
  72
  73         if (pkt_offset & IS_MANAGMEMENT_CALLBACK) {
  74
  75                 /* hostapd callback mgmt frame */
  76
  77                 skb = dev_alloc_skb(size + sizeof(struct wilc_wfi_radiotap_cb_hdr));
  78                 if (skb == NULL) {
  79                         PRINT_INFO(HOSTAPD_DBG, "Monitor if : No memory to allocate skb");
  80                         return;
  81                 }
  82
  83                 memcpy(skb_put(skb, size), buff, size);
  84
  85                 cb_hdr = (struct wilc_wfi_radiotap_cb_hdr *) skb_push(skb, sizeof(*cb_hdr));
  86                 memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
  87
  88                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
  89
  90                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_cb_hdr));
  91
  92                 cb_hdr->hdr.it_present = cpu_to_le32(
  93                                 (1 << IEEE80211_RADIOTAP_RATE) |
  94                                 (1 << IEEE80211_RADIOTAP_TX_FLAGS));
  95
  96                 cb_hdr->rate = 5; /* txrate->bitrate / 5; */
  97
  98                 if (pkt_offset & IS_MGMT_STATUS_SUCCES) {
  99                         /* success */
 100                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_RTS;
 101                 } else {
 102                         cb_hdr->tx_flags = IEEE80211_RADIOTAP_F_TX_FAIL;
 103                 }
 104
 105         } else {
 106
 107                 skb = dev_alloc_skb(size + sizeof(struct wilc_wfi_radiotap_hdr));
 108
 109                 if (skb == NULL) {
 110                         PRINT_INFO(HOSTAPD_DBG, "Monitor if : No memory to allocate skb");
 111                         return;
 112                 }
 113
 114                 memcpy(skb_put(skb, size), buff, size);
 115                 hdr = (struct wilc_wfi_radiotap_hdr *) skb_push(skb, sizeof(*hdr));
 116                 memset(hdr, 0, sizeof(struct wilc_wfi_radiotap_hdr));
 117                 hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
 118                 hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_hdr));
 119                 PRINT_INFO(HOSTAPD_DBG, "Radiotap len %d\n", hdr->hdr.it_len);
 120                 hdr->hdr.it_present = cpu_to_le32
 121                                 (1 << IEEE80211_RADIOTAP_RATE);                   /* | */
 122                 PRINT_INFO(HOSTAPD_DBG, "Presentflags %d\n", hdr->hdr.it_present);
 123                 hdr->rate = 5; /* txrate->bitrate / 5; */
 124
 125         }
 126
 127
 128
 129         skb->dev = wilc_wfi_mon;
 130         skb_set_mac_header(skb, 0);
 131         skb->ip_summed = CHECKSUM_UNNECESSARY;
 132         skb->pkt_type = PACKET_OTHERHOST;
 133         skb->protocol = htons(ETH_P_802_2);
 134         memset(skb->cb, 0, sizeof(skb->cb));
 135
 136         netif_rx(skb);
 137
 138
 139 }
 140
 141 struct tx_complete_mon_data {
 142         int size;
 143         void *buff;
 144 };
 145
 146 static void mgmt_tx_complete(void *priv, int status)
 147 {
 148
 149         struct tx_complete_mon_data *pv_data = (struct tx_complete_mon_data *)priv;
 150         u8 *buf =  pv_data->buff;
 151
 152
 153
 154         if (status == 1) {
 155                 if (INFO || buf[0] == 0x10 || buf[0] == 0xb0)
 156                         PRINT_INFO(HOSTAPD_DBG, "Packet sent successfully - Size = %d - Address = %p.\n", pv_data->size, pv_data->buff);
 157         } else {
 158                 PRINT_INFO(HOSTAPD_DBG, "Couldn't send packet - Size = %d - Address = %p.\n", pv_data->size, pv_data->buff);
 159         }
 160
 161
 162
 163         /* incase of fully hosting mode, the freeing will be done in response to the cfg packet */
 164         kfree(pv_data->buff);
 165
 166         kfree(pv_data);
 167 }
 168 static int mon_mgmt_tx(struct net_device *dev, const u8 *buf, size_t len)
 169 {
 170         struct tx_complete_mon_data *mgmt_tx = NULL;
 171
 172         if (dev == NULL) {
 173                 PRINT_D(HOSTAPD_DBG, "ERROR: dev == NULL\n");
 174                 return -EFAULT;
 175         }
 176
 177         netif_stop_queue(dev);
 178         mgmt_tx = kmalloc(sizeof(struct tx_complete_mon_data), GFP_ATOMIC);
 179         if (mgmt_tx == NULL) {
 180                 PRINT_ER("Failed to allocate memory for mgmt_tx structure\n");
 181                 return -EFAULT;
 182         }
 183
 184         mgmt_tx->buff = kmalloc(len, GFP_ATOMIC);
 185         if (mgmt_tx->buff == NULL) {
 186                 PRINT_ER("Failed to allocate memory for mgmt_tx buff\n");
 187                 kfree(mgmt_tx);
 188                 return -EFAULT;
 189
 190         }
 191
 192         mgmt_tx->size = len;
 193
 194         memcpy(mgmt_tx->buff, buf, len);
 195         wilc_wlan_txq_add_mgmt_pkt(dev, mgmt_tx, mgmt_tx->buff, mgmt_tx->size,
 196                                    mgmt_tx_complete);
 197
 198         netif_wake_queue(dev);
 199         return 0;
 200 }
 201
 202 /**
 203  *  @brief      WILC_WFI_mon_xmit
 204  *  @details
 205  *  @param[in]
 206  *  @return     int : Return 0 on Success
 207  *  @author     mdaftedar
 208  *  @date       12 JUL 2012
 209  *  @version    1.0
 210  */
 211 static netdev_tx_t WILC_WFI_mon_xmit(struct sk_buff *skb,
 212                                      struct net_device *dev)
 213 {
 214         u32 rtap_len, i, ret = 0;
 215         struct WILC_WFI_mon_priv  *mon_priv;
 216
 217         struct sk_buff *skb2;
 218         struct wilc_wfi_radiotap_cb_hdr *cb_hdr;
 219
 220         if (wilc_wfi_mon == NULL)
 221                 return -EFAULT;
 222
 223         mon_priv = netdev_priv(wilc_wfi_mon);
 224
 225         if (mon_priv == NULL) {
 226                 PRINT_ER("Monitor interface private structure is NULL\n");
 227                 return -EFAULT;
 228         }
 229
 230
 231         rtap_len = ieee80211_get_radiotap_len(skb->data);
 232         if (skb->len < rtap_len) {
 233                 PRINT_ER("Error in radiotap header\n");
 234                 return -1;
 235         }
 236         /* skip the radiotap header */
 237         PRINT_INFO(HOSTAPD_DBG, "Radiotap len: %d\n", rtap_len);
 238
 239         if (INFO) {
 240                 for (i = 0; i < rtap_len; i++)
 241                         PRINT_INFO(HOSTAPD_DBG, "Radiotap_hdr[%d] %02x\n", i, skb->data[i]);
 242         }
 243         /* Skip the ratio tap header */
 244         skb_pull(skb, rtap_len);
 245
 246         if (skb->data[0] == 0xc0)
 247                 PRINT_INFO(HOSTAPD_DBG, "%x:%x:%x:%x:%x%x\n", skb->data[4], skb->data[5], skb->data[6], skb->data[7], skb->data[8], skb->data[9]);
 248
 249         if (skb->data[0] == 0xc0 && (!(memcmp(broadcast, &skb->data[4], 6)))) {
 250                 skb2 = dev_alloc_skb(skb->len + sizeof(struct wilc_wfi_radiotap_cb_hdr));
 251
 252                 memcpy(skb_put(skb2, skb->len), skb->data, skb->len);
 253
 254                 cb_hdr = (struct wilc_wfi_radiotap_cb_hdr *) skb_push(skb2, sizeof(*cb_hdr));
 255                 memset(cb_hdr, 0, sizeof(struct wilc_wfi_radiotap_cb_hdr));
 256
 257                 cb_hdr->hdr.it_version = 0; /* PKTHDR_RADIOTAP_VERSION; */
 258
 259                 cb_hdr->hdr.it_len = cpu_to_le16(sizeof(struct wilc_wfi_radiotap_cb_hdr));
 260
 261                 cb_hdr->hdr.it_present = cpu_to_le32(
 262                                 (1 << IEEE80211_RADIOTAP_RATE) |
 263                                 (1 << IEEE80211_RADIOTAP_TX_FLAGS));
 264
 265                 cb_hdr->rate = 5; /* txrate->bitrate / 5; */
 266                 cb_hdr->tx_flags = 0x0004;
 267
 268                 skb2->dev = wilc_wfi_mon;
 269                 skb_set_mac_header(skb2, 0);
 270                 skb2->ip_summed = CHECKSUM_UNNECESSARY;
 271                 skb2->pkt_type = PACKET_OTHERHOST;
 272                 skb2->protocol = htons(ETH_P_802_2);
 273                 memset(skb2->cb, 0, sizeof(skb2->cb));
 274
 275                 netif_rx(skb2);
 276
 277                 return 0;
 278         }
 279         skb->dev = mon_priv->real_ndev;
 280
 281         PRINT_INFO(HOSTAPD_DBG, "Skipping the radiotap header\n");
 282
 283
 284
 285         /* actual deliver of data is device-specific, and not shown here */
 286         PRINT_INFO(HOSTAPD_DBG, "SKB netdevice name = %s\n", skb->dev->name);
 287         PRINT_INFO(HOSTAPD_DBG, "MONITOR real dev name = %s\n", mon_priv->real_ndev->name);
 288
 289         /* Identify if Ethernet or MAC header (data or mgmt) */
 290         memcpy(srcAdd, &skb->data[10], 6);
 291         memcpy(bssid, &skb->data[16], 6);
 292         /* if source address and bssid fields are equal>>Mac header */
 293         /*send it to mgmt frames handler */
 294         if (!(memcmp(srcAdd, bssid, 6))) {
 295                 mon_mgmt_tx(mon_priv->real_ndev, skb->data, skb->len);
 296                 dev_kfree_skb(skb);
 297         } else
 298                 ret = wilc_mac_xmit(skb, mon_priv->real_ndev);
 299
 300         return ret;
 301 }
 302
 303 static const struct net_device_ops wilc_wfi_netdev_ops = {
 304         .ndo_start_xmit         = WILC_WFI_mon_xmit,
 305
 306 };
 307
 308 /**
 309  *  @brief      WILC_WFI_init_mon_interface
 310  *  @details
 311  *  @param[in]
 312  *  @return     int : Return 0 on Success
 313  *  @author     mdaftedar
 314  *  @date       12 JUL 2012
 315  *  @version    1.0
 316  */
 317 struct net_device *WILC_WFI_init_mon_interface(const char *name, struct net_device *real_dev)
 318 {
 319
 320
 321         u32 ret = 0;
 322         struct WILC_WFI_mon_priv *priv;
 323
 324         /*If monitor interface is already initialized, return it*/
 325         if (wilc_wfi_mon) {
 326                 return wilc_wfi_mon;
 327         }
 328
 329         wilc_wfi_mon = alloc_etherdev(sizeof(struct WILC_WFI_mon_priv));
 330         if (!wilc_wfi_mon) {
 331                 PRINT_ER("failed to allocate memory\n");
 332                 return NULL;
 333
 334         }
 335
 336         wilc_wfi_mon->type = ARPHRD_IEEE80211_RADIOTAP;
 337         strncpy(wilc_wfi_mon->name, name, IFNAMSIZ);
 338         wilc_wfi_mon->name[IFNAMSIZ - 1] = 0;
 339         wilc_wfi_mon->netdev_ops = &wilc_wfi_netdev_ops;
 340
 341         ret = register_netdevice(wilc_wfi_mon);
 342         if (ret) {
 343                 PRINT_ER(" register_netdevice failed (%d)\n", ret);
 344                 return NULL;
 345         }
 346         priv = netdev_priv(wilc_wfi_mon);
 347         if (priv == NULL) {
 348                 PRINT_ER("private structure is NULL\n");
 349                 return NULL;
 350         }
 351
 352         priv->real_ndev = real_dev;
 353
 354         return wilc_wfi_mon;
 355 }
 356
 357 /**
 358  *  @brief      WILC_WFI_deinit_mon_interface
 359  *  @details
 360  *  @param[in]
 361  *  @return     int : Return 0 on Success
 362  *  @author     mdaftedar
 363  *  @date       12 JUL 2012
 364  *  @version    1.0
 365  */
 366 int WILC_WFI_deinit_mon_interface(void)
 367 {
 368         bool rollback_lock = false;
 369
 370         if (wilc_wfi_mon != NULL) {
 371                 PRINT_D(HOSTAPD_DBG, "In Deinit monitor interface\n");
 372                 PRINT_D(HOSTAPD_DBG, "RTNL is being locked\n");
 373                 if (rtnl_is_locked()) {
 374                         rtnl_unlock();
 375                         rollback_lock = true;
 376                 }
 377                 PRINT_D(HOSTAPD_DBG, "Unregister netdev\n");
 378                 unregister_netdev(wilc_wfi_mon);
 379
 380                 if (rollback_lock) {
 381                         rtnl_lock();
 382                         rollback_lock = false;
 383                 }
 384                 wilc_wfi_mon = NULL;
 385         }
 386         return 0;
 387
 388 }