drivers/net/wireless/hostap/hostap_info.c

   1 /* Host AP driver Info Frame processing (part of hostap.o module) */
   2
   3
   4 /* Called only as a tasklet (software IRQ) */
   5 static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
   6                                       int left)
   7 {
   8         struct hfa384x_comm_tallies *tallies;
   9
  10         if (left < sizeof(struct hfa384x_comm_tallies)) {
  11                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
  12                        "info frame\n", local->dev->name, left);
  13                 return;
  14         }
  15
  16         tallies = (struct hfa384x_comm_tallies *) buf;
  17 #define ADD_COMM_TALLIES(name) \
  18 local->comm_tallies.name += le16_to_cpu(tallies->name)
  19         ADD_COMM_TALLIES(tx_unicast_frames);
  20         ADD_COMM_TALLIES(tx_multicast_frames);
  21         ADD_COMM_TALLIES(tx_fragments);
  22         ADD_COMM_TALLIES(tx_unicast_octets);
  23         ADD_COMM_TALLIES(tx_multicast_octets);
  24         ADD_COMM_TALLIES(tx_deferred_transmissions);
  25         ADD_COMM_TALLIES(tx_single_retry_frames);
  26         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  27         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  28         ADD_COMM_TALLIES(tx_discards);
  29         ADD_COMM_TALLIES(rx_unicast_frames);
  30         ADD_COMM_TALLIES(rx_multicast_frames);
  31         ADD_COMM_TALLIES(rx_fragments);
  32         ADD_COMM_TALLIES(rx_unicast_octets);
  33         ADD_COMM_TALLIES(rx_multicast_octets);
  34         ADD_COMM_TALLIES(rx_fcs_errors);
  35         ADD_COMM_TALLIES(rx_discards_no_buffer);
  36         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  37         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  38         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  39         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  40 #undef ADD_COMM_TALLIES
  41 }
  42
  43
  44 /* Called only as a tasklet (software IRQ) */
  45 static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
  46                                       int left)
  47 {
  48         struct hfa384x_comm_tallies32 *tallies;
  49
  50         if (left < sizeof(struct hfa384x_comm_tallies32)) {
  51                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
  52                        "info frame\n", local->dev->name, left);
  53                 return;
  54         }
  55
  56         tallies = (struct hfa384x_comm_tallies32 *) buf;
  57 #define ADD_COMM_TALLIES(name) \
  58 local->comm_tallies.name += le32_to_cpu(tallies->name)
  59         ADD_COMM_TALLIES(tx_unicast_frames);
  60         ADD_COMM_TALLIES(tx_multicast_frames);
  61         ADD_COMM_TALLIES(tx_fragments);
  62         ADD_COMM_TALLIES(tx_unicast_octets);
  63         ADD_COMM_TALLIES(tx_multicast_octets);
  64         ADD_COMM_TALLIES(tx_deferred_transmissions);
  65         ADD_COMM_TALLIES(tx_single_retry_frames);
  66         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  67         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  68         ADD_COMM_TALLIES(tx_discards);
  69         ADD_COMM_TALLIES(rx_unicast_frames);
  70         ADD_COMM_TALLIES(rx_multicast_frames);
  71         ADD_COMM_TALLIES(rx_fragments);
  72         ADD_COMM_TALLIES(rx_unicast_octets);
  73         ADD_COMM_TALLIES(rx_multicast_octets);
  74         ADD_COMM_TALLIES(rx_fcs_errors);
  75         ADD_COMM_TALLIES(rx_discards_no_buffer);
  76         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  77         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  78         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  79         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  80 #undef ADD_COMM_TALLIES
  81 }
  82
  83
  84 /* Called only as a tasklet (software IRQ) */
  85 static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
  86                                     int left)
  87 {
  88         if (local->tallies32)
  89                 prism2_info_commtallies32(local, buf, left);
  90         else
  91                 prism2_info_commtallies16(local, buf, left);
  92 }
  93
  94
  95 #ifndef PRISM2_NO_STATION_MODES
  96 #ifndef PRISM2_NO_DEBUG
  97 static const char* hfa384x_linkstatus_str(u16 linkstatus)
  98 {
  99         switch (linkstatus) {
 100         case HFA384X_LINKSTATUS_CONNECTED:
 101                 return "Connected";
 102         case HFA384X_LINKSTATUS_DISCONNECTED:
 103                 return "Disconnected";
 104         case HFA384X_LINKSTATUS_AP_CHANGE:
 105                 return "Access point change";
 106         case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
 107                 return "Access point out of range";
 108         case HFA384X_LINKSTATUS_AP_IN_RANGE:
 109                 return "Access point in range";
 110         case HFA384X_LINKSTATUS_ASSOC_FAILED:
 111                 return "Association failed";
 112         default:
 113                 return "Unknown";
 114         }
 115 }
 116 #endif /* PRISM2_NO_DEBUG */
 117
 118
 119 /* Called only as a tasklet (software IRQ) */
 120 static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
 121                                     int left)
 122 {
 123         u16 val;
 124         int non_sta_mode;
 125
 126         /* Alloc new JoinRequests to occur since LinkStatus for the previous
 127          * has been received */
 128         local->last_join_time = 0;
 129
 130         if (left != 2) {
 131                 printk(KERN_DEBUG "%s: invalid linkstatus info frame "
 132                        "length %d\n", local->dev->name, left);
 133                 return;
 134         }
 135
 136         non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
 137                 local->iw_mode == IW_MODE_REPEAT ||
 138                 local->iw_mode == IW_MODE_MONITOR;
 139
 140         val = buf[0] | (buf[1] << 8);
 141         if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
 142                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
 143                        local->dev->name, val, hfa384x_linkstatus_str(val));
 144         }
 145
 146         if (non_sta_mode) {
 147                 netif_carrier_on(local->dev);
 148                 netif_carrier_on(local->ddev);
 149                 return;
 150         }
 151
 152         /* Get current BSSID later in scheduled task */
 153         set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
 154         local->prev_link_status = val;
 155         schedule_work(&local->info_queue);
 156 }
 157
 158
 159 static void prism2_host_roaming(local_info_t *local)
 160 {
 161         struct hfa384x_join_request req;
 162         struct net_device *dev = local->dev;
 163         struct hfa384x_scan_result *selected, *entry;
 164         int i;
 165         unsigned long flags;
 166
 167         if (local->last_join_time &&
 168             time_before(jiffies, local->last_join_time + 10 * HZ)) {
 169                 PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
 170                        "completed - waiting for it before issuing new one\n",
 171                        dev->name);
 172                 return;
 173         }
 174
 175         /* ScanResults are sorted: first ESS results in decreasing signal
 176          * quality then IBSS results in similar order.
 177          * Trivial roaming policy: just select the first entry.
 178          * This could probably be improved by adding hysteresis to limit
 179          * number of handoffs, etc.
 180          *
 181          * Could do periodic RID_SCANREQUEST or Inquire F101 to get new
 182          * ScanResults */
 183         spin_lock_irqsave(&local->lock, flags);
 184         if (local->last_scan_results == NULL ||
 185             local->last_scan_results_count == 0) {
 186                 spin_unlock_irqrestore(&local->lock, flags);
 187                 PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
 188                        dev->name);
 189                 return;
 190         }
 191
 192         selected = &local->last_scan_results[0];
 193
 194         if (local->preferred_ap[0] || local->preferred_ap[1] ||
 195             local->preferred_ap[2] || local->preferred_ap[3] ||
 196             local->preferred_ap[4] || local->preferred_ap[5]) {
 197                 /* Try to find preferred AP */
 198                 PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID " MACSTR "\n",
 199                        dev->name, MAC2STR(local->preferred_ap));
 200                 for (i = 0; i < local->last_scan_results_count; i++) {
 201                         entry = &local->last_scan_results[i];
 202                         if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
 203                         {
 204                                 PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
 205                                        "selection\n", dev->name);
 206                                 selected = entry;
 207                                 break;
 208                         }
 209                 }
 210         }
 211
 212         memcpy(req.bssid, selected->bssid, 6);
 213         req.channel = selected->chid;
 214         spin_unlock_irqrestore(&local->lock, flags);
 215
 216         PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=" MACSTR " channel=%d\n",
 217                dev->name, MAC2STR(req.bssid), le16_to_cpu(req.channel));
 218         if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
 219                                  sizeof(req))) {
 220                 printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
 221         }
 222         local->last_join_time = jiffies;
 223 }
 224
 225
 226 static void hostap_report_scan_complete(local_info_t *local)
 227 {
 228         union iwreq_data wrqu;
 229
 230         /* Inform user space about new scan results (just empty event,
 231          * SIOCGIWSCAN can be used to fetch data */
 232         wrqu.data.length = 0;
 233         wrqu.data.flags = 0;
 234         wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
 235
 236         /* Allow SIOCGIWSCAN handling to occur since we have received
 237          * scanning result */
 238         local->scan_timestamp = 0;
 239 }
 240
 241
 242 /* Called only as a tasklet (software IRQ) */
 243 static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
 244                                     int left)
 245 {
 246         u16 *pos;
 247         int new_count;
 248         unsigned long flags;
 249         struct hfa384x_scan_result *results, *prev;
 250
 251         if (left < 4) {
 252                 printk(KERN_DEBUG "%s: invalid scanresult info frame "
 253                        "length %d\n", local->dev->name, left);
 254                 return;
 255         }
 256
 257         pos = (u16 *) buf;
 258         pos++;
 259         pos++;
 260         left -= 4;
 261
 262         new_count = left / sizeof(struct hfa384x_scan_result);
 263         results = kmalloc(new_count * sizeof(struct hfa384x_scan_result),
 264                           GFP_ATOMIC);
 265         if (results == NULL)
 266                 return;
 267         memcpy(results, pos, new_count * sizeof(struct hfa384x_scan_result));
 268
 269         spin_lock_irqsave(&local->lock, flags);
 270         local->last_scan_type = PRISM2_SCAN;
 271         prev = local->last_scan_results;
 272         local->last_scan_results = results;
 273         local->last_scan_results_count = new_count;
 274         spin_unlock_irqrestore(&local->lock, flags);
 275         kfree(prev);
 276
 277         hostap_report_scan_complete(local);
 278
 279         /* Perform rest of ScanResults handling later in scheduled task */
 280         set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
 281         schedule_work(&local->info_queue);
 282 }
 283
 284
 285 /* Called only as a tasklet (software IRQ) */
 286 static void prism2_info_hostscanresults(local_info_t *local,
 287                                         unsigned char *buf, int left)
 288 {
 289         int i, result_size, copy_len, new_count;
 290         struct hfa384x_hostscan_result *results, *prev;
 291         unsigned long flags;
 292         u16 *pos;
 293         u8 *ptr;
 294
 295         wake_up_interruptible(&local->hostscan_wq);
 296
 297         if (left < 4) {
 298                 printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
 299                        "length %d\n", local->dev->name, left);
 300                 return;
 301         }
 302
 303         pos = (u16 *) buf;
 304         copy_len = result_size = le16_to_cpu(*pos);
 305         if (result_size == 0) {
 306                 printk(KERN_DEBUG "%s: invalid result_size (0) in "
 307                        "hostscanresults\n", local->dev->name);
 308                 return;
 309         }
 310         if (copy_len > sizeof(struct hfa384x_hostscan_result))
 311                 copy_len = sizeof(struct hfa384x_hostscan_result);
 312
 313         pos++;
 314         pos++;
 315         left -= 4;
 316         ptr = (u8 *) pos;
 317
 318         new_count = left / result_size;
 319         results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
 320                           GFP_ATOMIC);
 321         if (results == NULL)
 322                 return;
 323         memset(results, 0, new_count * sizeof(struct hfa384x_hostscan_result));
 324
 325         for (i = 0; i < new_count; i++) {
 326                 memcpy(&results[i], ptr, copy_len);
 327                 ptr += result_size;
 328                 left -= result_size;
 329         }
 330
 331         if (left) {
 332                 printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
 333                        local->dev->name, left, result_size);
 334         }
 335
 336         spin_lock_irqsave(&local->lock, flags);
 337         local->last_scan_type = PRISM2_HOSTSCAN;
 338         prev = local->last_hostscan_results;
 339         local->last_hostscan_results = results;
 340         local->last_hostscan_results_count = new_count;
 341         spin_unlock_irqrestore(&local->lock, flags);
 342         kfree(prev);
 343
 344         hostap_report_scan_complete(local);
 345 }
 346 #endif /* PRISM2_NO_STATION_MODES */
 347
 348
 349 /* Called only as a tasklet (software IRQ) */
 350 void hostap_info_process(local_info_t *local, struct sk_buff *skb)
 351 {
 352         struct hfa384x_info_frame *info;
 353         unsigned char *buf;
 354         int left;
 355 #ifndef PRISM2_NO_DEBUG
 356         int i;
 357 #endif /* PRISM2_NO_DEBUG */
 358
 359         info = (struct hfa384x_info_frame *) skb->data;
 360         buf = skb->data + sizeof(*info);
 361         left = skb->len - sizeof(*info);
 362
 363         switch (info->type) {
 364         case HFA384X_INFO_COMMTALLIES:
 365                 prism2_info_commtallies(local, buf, left);
 366                 break;
 367
 368 #ifndef PRISM2_NO_STATION_MODES
 369         case HFA384X_INFO_LINKSTATUS:
 370                 prism2_info_linkstatus(local, buf, left);
 371                 break;
 372
 373         case HFA384X_INFO_SCANRESULTS:
 374                 prism2_info_scanresults(local, buf, left);
 375                 break;
 376
 377         case HFA384X_INFO_HOSTSCANRESULTS:
 378                 prism2_info_hostscanresults(local, buf, left);
 379                 break;
 380 #endif /* PRISM2_NO_STATION_MODES */
 381
 382 #ifndef PRISM2_NO_DEBUG
 383         default:
 384                 PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
 385                        local->dev->name, info->len, info->type);
 386                 PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
 387                 for (i = 0; i < (left < 100 ? left : 100); i++)
 388                         PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
 389                 PDEBUG2(DEBUG_EXTRA, "\n");
 390                 break;
 391 #endif /* PRISM2_NO_DEBUG */
 392         }
 393 }
 394
 395
 396 #ifndef PRISM2_NO_STATION_MODES
 397 static void handle_info_queue_linkstatus(local_info_t *local)
 398 {
 399         int val = local->prev_link_status;
 400         int connected;
 401         union iwreq_data wrqu;
 402
 403         connected =
 404                 val == HFA384X_LINKSTATUS_CONNECTED ||
 405                 val == HFA384X_LINKSTATUS_AP_CHANGE ||
 406                 val == HFA384X_LINKSTATUS_AP_IN_RANGE;
 407
 408         if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
 409                                  local->bssid, ETH_ALEN, 1) < 0) {
 410                 printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
 411                        "LinkStatus event\n", local->dev->name);
 412         } else {
 413                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=" MACSTR "\n",
 414                        local->dev->name,
 415                        MAC2STR((unsigned char *) local->bssid));
 416                 if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
 417                         hostap_add_sta(local->ap, local->bssid);
 418         }
 419
 420         /* Get BSSID if we have a valid AP address */
 421         if (connected) {
 422                 netif_carrier_on(local->dev);
 423                 netif_carrier_on(local->ddev);
 424                 memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
 425         } else {
 426                 netif_carrier_off(local->dev);
 427                 netif_carrier_off(local->ddev);
 428                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 429         }
 430         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 431
 432         /*
 433          * Filter out sequential disconnect events in order not to cause a
 434          * flood of SIOCGIWAP events that have a race condition with EAPOL
 435          * frames and can confuse wpa_supplicant about the current association
 436          * status.
 437          */
 438         if (connected || local->prev_linkstatus_connected)
 439                 wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
 440         local->prev_linkstatus_connected = connected;
 441 }
 442
 443
 444 static void handle_info_queue_scanresults(local_info_t *local)
 445 {
 446         if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
 447                 prism2_host_roaming(local);
 448 }
 449
 450
 451 /* Called only as scheduled task after receiving info frames (used to avoid
 452  * pending too much time in HW IRQ handler). */
 453 static void handle_info_queue(void *data)
 454 {
 455         local_info_t *local = (local_info_t *) data;
 456
 457         if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
 458                                &local->pending_info))
 459                 handle_info_queue_linkstatus(local);
 460
 461         if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
 462                                &local->pending_info))
 463                 handle_info_queue_scanresults(local);
 464 }
 465 #endif /* PRISM2_NO_STATION_MODES */
 466
 467
 468 void hostap_info_init(local_info_t *local)
 469 {
 470         skb_queue_head_init(&local->info_list);
 471 #ifndef PRISM2_NO_STATION_MODES
 472         INIT_WORK(&local->info_queue, handle_info_queue, local);
 473 #endif /* PRISM2_NO_STATION_MODES */
 474 }
 475
 476
 477 EXPORT_SYMBOL(hostap_info_init);
 478 EXPORT_SYMBOL(hostap_info_process);