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