drivers/net/wireless/hostap/hostap_info.c

   1 /* Host AP driver Info Frame processing (part of hostap.o module) */
   2
   3 #include "hostap_wlan.h"
   4 #include "hostap.h"
   5 #include "hostap_ap.h"
   6
   7 /* Called only as a tasklet (software IRQ) */
   8 static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
   9                                       int left)
  10 {
  11         struct hfa384x_comm_tallies *tallies;
  12
  13         if (left < sizeof(struct hfa384x_comm_tallies)) {
  14                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
  15                        "info frame\n", local->dev->name, left);
  16                 return;
  17         }
  18
  19         tallies = (struct hfa384x_comm_tallies *) buf;
  20 #define ADD_COMM_TALLIES(name) \
  21 local->comm_tallies.name += le16_to_cpu(tallies->name)
  22         ADD_COMM_TALLIES(tx_unicast_frames);
  23         ADD_COMM_TALLIES(tx_multicast_frames);
  24         ADD_COMM_TALLIES(tx_fragments);
  25         ADD_COMM_TALLIES(tx_unicast_octets);
  26         ADD_COMM_TALLIES(tx_multicast_octets);
  27         ADD_COMM_TALLIES(tx_deferred_transmissions);
  28         ADD_COMM_TALLIES(tx_single_retry_frames);
  29         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  30         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  31         ADD_COMM_TALLIES(tx_discards);
  32         ADD_COMM_TALLIES(rx_unicast_frames);
  33         ADD_COMM_TALLIES(rx_multicast_frames);
  34         ADD_COMM_TALLIES(rx_fragments);
  35         ADD_COMM_TALLIES(rx_unicast_octets);
  36         ADD_COMM_TALLIES(rx_multicast_octets);
  37         ADD_COMM_TALLIES(rx_fcs_errors);
  38         ADD_COMM_TALLIES(rx_discards_no_buffer);
  39         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  40         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  41         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  42         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  43 #undef ADD_COMM_TALLIES
  44 }
  45
  46
  47 /* Called only as a tasklet (software IRQ) */
  48 static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
  49                                       int left)
  50 {
  51         struct hfa384x_comm_tallies32 *tallies;
  52
  53         if (left < sizeof(struct hfa384x_comm_tallies32)) {
  54                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
  55                        "info frame\n", local->dev->name, left);
  56                 return;
  57         }
  58
  59         tallies = (struct hfa384x_comm_tallies32 *) buf;
  60 #define ADD_COMM_TALLIES(name) \
  61 local->comm_tallies.name += le32_to_cpu(tallies->name)
  62         ADD_COMM_TALLIES(tx_unicast_frames);
  63         ADD_COMM_TALLIES(tx_multicast_frames);
  64         ADD_COMM_TALLIES(tx_fragments);
  65         ADD_COMM_TALLIES(tx_unicast_octets);
  66         ADD_COMM_TALLIES(tx_multicast_octets);
  67         ADD_COMM_TALLIES(tx_deferred_transmissions);
  68         ADD_COMM_TALLIES(tx_single_retry_frames);
  69         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  70         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  71         ADD_COMM_TALLIES(tx_discards);
  72         ADD_COMM_TALLIES(rx_unicast_frames);
  73         ADD_COMM_TALLIES(rx_multicast_frames);
  74         ADD_COMM_TALLIES(rx_fragments);
  75         ADD_COMM_TALLIES(rx_unicast_octets);
  76         ADD_COMM_TALLIES(rx_multicast_octets);
  77         ADD_COMM_TALLIES(rx_fcs_errors);
  78         ADD_COMM_TALLIES(rx_discards_no_buffer);
  79         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  80         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  81         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  82         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  83 #undef ADD_COMM_TALLIES
  84 }
  85
  86
  87 /* Called only as a tasklet (software IRQ) */
  88 static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
  89                                     int left)
  90 {
  91         if (local->tallies32)
  92                 prism2_info_commtallies32(local, buf, left);
  93         else
  94                 prism2_info_commtallies16(local, buf, left);
  95 }
  96
  97
  98 #ifndef PRISM2_NO_STATION_MODES
  99 #ifndef PRISM2_NO_DEBUG
 100 static const char* hfa384x_linkstatus_str(u16 linkstatus)
 101 {
 102         switch (linkstatus) {
 103         case HFA384X_LINKSTATUS_CONNECTED:
 104                 return "Connected";
 105         case HFA384X_LINKSTATUS_DISCONNECTED:
 106                 return "Disconnected";
 107         case HFA384X_LINKSTATUS_AP_CHANGE:
 108                 return "Access point change";
 109         case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
 110                 return "Access point out of range";
 111         case HFA384X_LINKSTATUS_AP_IN_RANGE:
 112                 return "Access point in range";
 113         case HFA384X_LINKSTATUS_ASSOC_FAILED:
 114                 return "Association failed";
 115         default:
 116                 return "Unknown";
 117         }
 118 }
 119 #endif /* PRISM2_NO_DEBUG */
 120
 121
 122 /* Called only as a tasklet (software IRQ) */
 123 static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
 124                                     int left)
 125 {
 126         u16 val;
 127         int non_sta_mode;
 128
 129         /* Alloc new JoinRequests to occur since LinkStatus for the previous
 130          * has been received */
 131         local->last_join_time = 0;
 132
 133         if (left != 2) {
 134                 printk(KERN_DEBUG "%s: invalid linkstatus info frame "
 135                        "length %d\n", local->dev->name, left);
 136                 return;
 137         }
 138
 139         non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
 140                 local->iw_mode == IW_MODE_REPEAT ||
 141                 local->iw_mode == IW_MODE_MONITOR;
 142
 143         val = buf[0] | (buf[1] << 8);
 144         if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
 145                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
 146                        local->dev->name, val, hfa384x_linkstatus_str(val));
 147         }
 148
 149         if (non_sta_mode) {
 150                 netif_carrier_on(local->dev);
 151                 netif_carrier_on(local->ddev);
 152                 return;
 153         }
 154
 155         /* Get current BSSID later in scheduled task */
 156         set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
 157         local->prev_link_status = val;
 158         schedule_work(&local->info_queue);
 159 }
 160
 161
 162 static void prism2_host_roaming(local_info_t *local)
 163 {
 164         struct hfa384x_join_request req;
 165         struct net_device *dev = local->dev;
 166         struct hfa384x_hostscan_result *selected, *entry;
 167         int i;
 168         unsigned long flags;
 169         DECLARE_MAC_BUF(mac);
 170
 171         if (local->last_join_time &&
 172             time_before(jiffies, local->last_join_time + 10 * HZ)) {
 173                 PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
 174                        "completed - waiting for it before issuing new one\n",
 175                        dev->name);
 176                 return;
 177         }
 178
 179         /* ScanResults are sorted: first ESS results in decreasing signal
 180          * quality then IBSS results in similar order.
 181          * Trivial roaming policy: just select the first entry.
 182          * This could probably be improved by adding hysteresis to limit
 183          * number of handoffs, etc.
 184          *
 185          * Could do periodic RID_SCANREQUEST or Inquire F101 to get new
 186          * ScanResults */
 187         spin_lock_irqsave(&local->lock, flags);
 188         if (local->last_scan_results == NULL ||
 189             local->last_scan_results_count == 0) {
 190                 spin_unlock_irqrestore(&local->lock, flags);
 191                 PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
 192                        dev->name);
 193                 return;
 194         }
 195
 196         selected = &local->last_scan_results[0];
 197
 198         if (local->preferred_ap[0] || local->preferred_ap[1] ||
 199             local->preferred_ap[2] || local->preferred_ap[3] ||
 200             local->preferred_ap[4] || local->preferred_ap[5]) {
 201                 /* Try to find preferred AP */
 202                 PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID "
 203                        "%s\n",
 204                        dev->name, print_mac(mac, local->preferred_ap));
 205                 for (i = 0; i < local->last_scan_results_count; i++) {
 206                         entry = &local->last_scan_results[i];
 207                         if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
 208                         {
 209                                 PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
 210                                        "selection\n", dev->name);
 211                                 selected = entry;
 212                                 break;
 213                         }
 214                 }
 215         }
 216
 217         memcpy(req.bssid, selected->bssid, 6);
 218         req.channel = selected->chid;
 219         spin_unlock_irqrestore(&local->lock, flags);
 220
 221         PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=%s"
 222                " channel=%d\n",
 223                dev->name, print_mac(mac, req.bssid), le16_to_cpu(req.channel));
 224         if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
 225                                  sizeof(req))) {
 226                 printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
 227         }
 228         local->last_join_time = jiffies;
 229 }
 230
 231
 232 static void hostap_report_scan_complete(local_info_t *local)
 233 {
 234         union iwreq_data wrqu;
 235
 236         /* Inform user space about new scan results (just empty event,
 237          * SIOCGIWSCAN can be used to fetch data */
 238         wrqu.data.length = 0;
 239         wrqu.data.flags = 0;
 240         wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
 241
 242         /* Allow SIOCGIWSCAN handling to occur since we have received
 243          * scanning result */
 244         local->scan_timestamp = 0;
 245 }
 246
 247
 248 /* Called only as a tasklet (software IRQ) */
 249 static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
 250                                     int left)
 251 {
 252         u16 *pos;
 253         int new_count, i;
 254         unsigned long flags;
 255         struct hfa384x_scan_result *res;
 256         struct hfa384x_hostscan_result *results, *prev;
 257
 258         if (left < 4) {
 259                 printk(KERN_DEBUG "%s: invalid scanresult info frame "
 260                        "length %d\n", local->dev->name, left);
 261                 return;
 262         }
 263
 264         pos = (u16 *) buf;
 265         pos++;
 266         pos++;
 267         left -= 4;
 268
 269         new_count = left / sizeof(struct hfa384x_scan_result);
 270         results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
 271                           GFP_ATOMIC);
 272         if (results == NULL)
 273                 return;
 274
 275         /* Convert to hostscan result format. */
 276         res = (struct hfa384x_scan_result *) pos;
 277         for (i = 0; i < new_count; i++) {
 278                 memcpy(&results[i], &res[i],
 279                        sizeof(struct hfa384x_scan_result));
 280                 results[i].atim = 0;
 281         }
 282
 283         spin_lock_irqsave(&local->lock, flags);
 284         local->last_scan_type = PRISM2_SCAN;
 285         prev = local->last_scan_results;
 286         local->last_scan_results = results;
 287         local->last_scan_results_count = new_count;
 288         spin_unlock_irqrestore(&local->lock, flags);
 289         kfree(prev);
 290
 291         hostap_report_scan_complete(local);
 292
 293         /* Perform rest of ScanResults handling later in scheduled task */
 294         set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
 295         schedule_work(&local->info_queue);
 296 }
 297
 298
 299 /* Called only as a tasklet (software IRQ) */
 300 static void prism2_info_hostscanresults(local_info_t *local,
 301                                         unsigned char *buf, int left)
 302 {
 303         int i, result_size, copy_len, new_count;
 304         struct hfa384x_hostscan_result *results, *prev;
 305         unsigned long flags;
 306         u16 *pos;
 307         u8 *ptr;
 308
 309         wake_up_interruptible(&local->hostscan_wq);
 310
 311         if (left < 4) {
 312                 printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
 313                        "length %d\n", local->dev->name, left);
 314                 return;
 315         }
 316
 317         pos = (u16 *) buf;
 318         copy_len = result_size = le16_to_cpu(*pos);
 319         if (result_size == 0) {
 320                 printk(KERN_DEBUG "%s: invalid result_size (0) in "
 321                        "hostscanresults\n", local->dev->name);
 322                 return;
 323         }
 324         if (copy_len > sizeof(struct hfa384x_hostscan_result))
 325                 copy_len = sizeof(struct hfa384x_hostscan_result);
 326
 327         pos++;
 328         pos++;
 329         left -= 4;
 330         ptr = (u8 *) pos;
 331
 332         new_count = left / result_size;
 333         results = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result),
 334                           GFP_ATOMIC);
 335         if (results == NULL)
 336                 return;
 337
 338         for (i = 0; i < new_count; i++) {
 339                 memcpy(&results[i], ptr, copy_len);
 340                 ptr += result_size;
 341                 left -= result_size;
 342         }
 343
 344         if (left) {
 345                 printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
 346                        local->dev->name, left, result_size);
 347         }
 348
 349         spin_lock_irqsave(&local->lock, flags);
 350         local->last_scan_type = PRISM2_HOSTSCAN;
 351         prev = local->last_scan_results;
 352         local->last_scan_results = results;
 353         local->last_scan_results_count = new_count;
 354         spin_unlock_irqrestore(&local->lock, flags);
 355         kfree(prev);
 356
 357         hostap_report_scan_complete(local);
 358 }
 359 #endif /* PRISM2_NO_STATION_MODES */
 360
 361
 362 /* Called only as a tasklet (software IRQ) */
 363 void hostap_info_process(local_info_t *local, struct sk_buff *skb)
 364 {
 365         struct hfa384x_info_frame *info;
 366         unsigned char *buf;
 367         int left;
 368 #ifndef PRISM2_NO_DEBUG
 369         int i;
 370 #endif /* PRISM2_NO_DEBUG */
 371
 372         info = (struct hfa384x_info_frame *) skb->data;
 373         buf = skb->data + sizeof(*info);
 374         left = skb->len - sizeof(*info);
 375
 376         switch (info->type) {
 377         case HFA384X_INFO_COMMTALLIES:
 378                 prism2_info_commtallies(local, buf, left);
 379                 break;
 380
 381 #ifndef PRISM2_NO_STATION_MODES
 382         case HFA384X_INFO_LINKSTATUS:
 383                 prism2_info_linkstatus(local, buf, left);
 384                 break;
 385
 386         case HFA384X_INFO_SCANRESULTS:
 387                 prism2_info_scanresults(local, buf, left);
 388                 break;
 389
 390         case HFA384X_INFO_HOSTSCANRESULTS:
 391                 prism2_info_hostscanresults(local, buf, left);
 392                 break;
 393 #endif /* PRISM2_NO_STATION_MODES */
 394
 395 #ifndef PRISM2_NO_DEBUG
 396         default:
 397                 PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
 398                        local->dev->name, info->len, info->type);
 399                 PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
 400                 for (i = 0; i < (left < 100 ? left : 100); i++)
 401                         PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
 402                 PDEBUG2(DEBUG_EXTRA, "\n");
 403                 break;
 404 #endif /* PRISM2_NO_DEBUG */
 405         }
 406 }
 407
 408
 409 #ifndef PRISM2_NO_STATION_MODES
 410 static void handle_info_queue_linkstatus(local_info_t *local)
 411 {
 412         int val = local->prev_link_status;
 413         int connected;
 414         union iwreq_data wrqu;
 415         DECLARE_MAC_BUF(mac);
 416
 417         connected =
 418                 val == HFA384X_LINKSTATUS_CONNECTED ||
 419                 val == HFA384X_LINKSTATUS_AP_CHANGE ||
 420                 val == HFA384X_LINKSTATUS_AP_IN_RANGE;
 421
 422         if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
 423                                  local->bssid, ETH_ALEN, 1) < 0) {
 424                 printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
 425                        "LinkStatus event\n", local->dev->name);
 426         } else {
 427                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID="
 428                        "%s\n",
 429                        local->dev->name,
 430                        print_mac(mac, (unsigned char *) local->bssid));
 431                 if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
 432                         hostap_add_sta(local->ap, local->bssid);
 433         }
 434
 435         /* Get BSSID if we have a valid AP address */
 436         if (connected) {
 437                 netif_carrier_on(local->dev);
 438                 netif_carrier_on(local->ddev);
 439                 memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
 440         } else {
 441                 netif_carrier_off(local->dev);
 442                 netif_carrier_off(local->ddev);
 443                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 444         }
 445         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 446
 447         /*
 448          * Filter out sequential disconnect events in order not to cause a
 449          * flood of SIOCGIWAP events that have a race condition with EAPOL
 450          * frames and can confuse wpa_supplicant about the current association
 451          * status.
 452          */
 453         if (connected || local->prev_linkstatus_connected)
 454                 wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
 455         local->prev_linkstatus_connected = connected;
 456 }
 457
 458
 459 static void handle_info_queue_scanresults(local_info_t *local)
 460 {
 461         if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
 462                 prism2_host_roaming(local);
 463
 464         if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
 465             memcmp(local->preferred_ap, "\x00\x00\x00\x00\x00\x00",
 466                    ETH_ALEN) != 0) {
 467                 /*
 468                  * Firmware seems to be getting into odd state in host_roaming
 469                  * mode 2 when hostscan is used without join command, so try
 470                  * to fix this by re-joining the current AP. This does not
 471                  * actually trigger a new association if the current AP is
 472                  * still in the scan results.
 473                  */
 474                 prism2_host_roaming(local);
 475         }
 476 }
 477
 478
 479 /* Called only as scheduled task after receiving info frames (used to avoid
 480  * pending too much time in HW IRQ handler). */
 481 static void handle_info_queue(struct work_struct *work)
 482 {
 483         local_info_t *local = container_of(work, local_info_t, info_queue);
 484
 485         if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
 486                                &local->pending_info))
 487                 handle_info_queue_linkstatus(local);
 488
 489         if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
 490                                &local->pending_info))
 491                 handle_info_queue_scanresults(local);
 492 }
 493 #endif /* PRISM2_NO_STATION_MODES */
 494
 495
 496 void hostap_info_init(local_info_t *local)
 497 {
 498         skb_queue_head_init(&local->info_list);
 499 #ifndef PRISM2_NO_STATION_MODES
 500         INIT_WORK(&local->info_queue, handle_info_queue);
 501 #endif /* PRISM2_NO_STATION_MODES */
 502 }
 503
 504
 505 EXPORT_SYMBOL(hostap_info_init);
 506 EXPORT_SYMBOL(hostap_info_process);