drivers/net/wireless/hostap/hostap_info.c

   1 /* Host AP driver Info Frame processing (part of hostap.o module) */
   2
   3 #include <linux/if_arp.h>
   4 #include <linux/sched.h>
   5 #include <linux/slab.h>
   6 #include <linux/export.h>
   7 #include "hostap_wlan.h"
   8 #include "hostap.h"
   9 #include "hostap_ap.h"
  10
  11 /* Called only as a tasklet (software IRQ) */
  12 static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
  13                                       int left)
  14 {
  15         struct hfa384x_comm_tallies *tallies;
  16
  17         if (left < sizeof(struct hfa384x_comm_tallies)) {
  18                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
  19                        "info frame\n", local->dev->name, left);
  20                 return;
  21         }
  22
  23         tallies = (struct hfa384x_comm_tallies *) buf;
  24 #define ADD_COMM_TALLIES(name) \
  25 local->comm_tallies.name += le16_to_cpu(tallies->name)
  26         ADD_COMM_TALLIES(tx_unicast_frames);
  27         ADD_COMM_TALLIES(tx_multicast_frames);
  28         ADD_COMM_TALLIES(tx_fragments);
  29         ADD_COMM_TALLIES(tx_unicast_octets);
  30         ADD_COMM_TALLIES(tx_multicast_octets);
  31         ADD_COMM_TALLIES(tx_deferred_transmissions);
  32         ADD_COMM_TALLIES(tx_single_retry_frames);
  33         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  34         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  35         ADD_COMM_TALLIES(tx_discards);
  36         ADD_COMM_TALLIES(rx_unicast_frames);
  37         ADD_COMM_TALLIES(rx_multicast_frames);
  38         ADD_COMM_TALLIES(rx_fragments);
  39         ADD_COMM_TALLIES(rx_unicast_octets);
  40         ADD_COMM_TALLIES(rx_multicast_octets);
  41         ADD_COMM_TALLIES(rx_fcs_errors);
  42         ADD_COMM_TALLIES(rx_discards_no_buffer);
  43         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  44         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  45         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  46         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  47 #undef ADD_COMM_TALLIES
  48 }
  49
  50
  51 /* Called only as a tasklet (software IRQ) */
  52 static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
  53                                       int left)
  54 {
  55         struct hfa384x_comm_tallies32 *tallies;
  56
  57         if (left < sizeof(struct hfa384x_comm_tallies32)) {
  58                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
  59                        "info frame\n", local->dev->name, left);
  60                 return;
  61         }
  62
  63         tallies = (struct hfa384x_comm_tallies32 *) buf;
  64 #define ADD_COMM_TALLIES(name) \
  65 local->comm_tallies.name += le32_to_cpu(tallies->name)
  66         ADD_COMM_TALLIES(tx_unicast_frames);
  67         ADD_COMM_TALLIES(tx_multicast_frames);
  68         ADD_COMM_TALLIES(tx_fragments);
  69         ADD_COMM_TALLIES(tx_unicast_octets);
  70         ADD_COMM_TALLIES(tx_multicast_octets);
  71         ADD_COMM_TALLIES(tx_deferred_transmissions);
  72         ADD_COMM_TALLIES(tx_single_retry_frames);
  73         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  74         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  75         ADD_COMM_TALLIES(tx_discards);
  76         ADD_COMM_TALLIES(rx_unicast_frames);
  77         ADD_COMM_TALLIES(rx_multicast_frames);
  78         ADD_COMM_TALLIES(rx_fragments);
  79         ADD_COMM_TALLIES(rx_unicast_octets);
  80         ADD_COMM_TALLIES(rx_multicast_octets);
  81         ADD_COMM_TALLIES(rx_fcs_errors);
  82         ADD_COMM_TALLIES(rx_discards_no_buffer);
  83         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  84         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  85         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  86         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  87 #undef ADD_COMM_TALLIES
  88 }
  89
  90
  91 /* Called only as a tasklet (software IRQ) */
  92 static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
  93                                     int left)
  94 {
  95         if (local->tallies32)
  96                 prism2_info_commtallies32(local, buf, left);
  97         else
  98                 prism2_info_commtallies16(local, buf, left);
  99 }
 100
 101
 102 #ifndef PRISM2_NO_STATION_MODES
 103 #ifndef PRISM2_NO_DEBUG
 104 static const char* hfa384x_linkstatus_str(u16 linkstatus)
 105 {
 106         switch (linkstatus) {
 107         case HFA384X_LINKSTATUS_CONNECTED:
 108                 return "Connected";
 109         case HFA384X_LINKSTATUS_DISCONNECTED:
 110                 return "Disconnected";
 111         case HFA384X_LINKSTATUS_AP_CHANGE:
 112                 return "Access point change";
 113         case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
 114                 return "Access point out of range";
 115         case HFA384X_LINKSTATUS_AP_IN_RANGE:
 116                 return "Access point in range";
 117         case HFA384X_LINKSTATUS_ASSOC_FAILED:
 118                 return "Association failed";
 119         default:
 120                 return "Unknown";
 121         }
 122 }
 123 #endif /* PRISM2_NO_DEBUG */
 124
 125
 126 /* Called only as a tasklet (software IRQ) */
 127 static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
 128                                     int left)
 129 {
 130         u16 val;
 131         int non_sta_mode;
 132
 133         /* Alloc new JoinRequests to occur since LinkStatus for the previous
 134          * has been received */
 135         local->last_join_time = 0;
 136
 137         if (left != 2) {
 138                 printk(KERN_DEBUG "%s: invalid linkstatus info frame "
 139                        "length %d\n", local->dev->name, left);
 140                 return;
 141         }
 142
 143         non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
 144                 local->iw_mode == IW_MODE_REPEAT ||
 145                 local->iw_mode == IW_MODE_MONITOR;
 146
 147         val = buf[0] | (buf[1] << 8);
 148         if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
 149                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
 150                        local->dev->name, val, hfa384x_linkstatus_str(val));
 151         }
 152
 153         if (non_sta_mode) {
 154                 netif_carrier_on(local->dev);
 155                 netif_carrier_on(local->ddev);
 156                 return;
 157         }
 158
 159         /* Get current BSSID later in scheduled task */
 160         set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
 161         local->prev_link_status = val;
 162         schedule_work(&local->info_queue);
 163 }
 164
 165
 166 static void prism2_host_roaming(local_info_t *local)
 167 {
 168         struct hfa384x_join_request req;
 169         struct net_device *dev = local->dev;
 170         struct hfa384x_hostscan_result *selected, *entry;
 171         int i;
 172         unsigned long flags;
 173
 174         if (local->last_join_time &&
 175             time_before(jiffies, local->last_join_time + 10 * HZ)) {
 176                 PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
 177                        "completed - waiting for it before issuing new one\n",
 178                        dev->name);
 179                 return;
 180         }
 181
 182         /* ScanResults are sorted: first ESS results in decreasing signal
 183          * quality then IBSS results in similar order.
 184          * Trivial roaming policy: just select the first entry.
 185          * This could probably be improved by adding hysteresis to limit
 186          * number of handoffs, etc.
 187          *
 188          * Could do periodic RID_SCANREQUEST or Inquire F101 to get new
 189          * ScanResults */
 190         spin_lock_irqsave(&local->lock, flags);
 191         if (local->last_scan_results == NULL ||
 192             local->last_scan_results_count == 0) {
 193                 spin_unlock_irqrestore(&local->lock, flags);
 194                 PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
 195                        dev->name);
 196                 return;
 197         }
 198
 199         selected = &local->last_scan_results[0];
 200
 201         if (local->preferred_ap[0] || local->preferred_ap[1] ||
 202             local->preferred_ap[2] || local->preferred_ap[3] ||
 203             local->preferred_ap[4] || local->preferred_ap[5]) {
 204                 /* Try to find preferred AP */
 205                 PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID %pM\n",
 206                        dev->name, local->preferred_ap);
 207                 for (i = 0; i < local->last_scan_results_count; i++) {
 208                         entry = &local->last_scan_results[i];
 209                         if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
 210                         {
 211                                 PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
 212                                        "selection\n", dev->name);
 213                                 selected = entry;
 214                                 break;
 215                         }
 216                 }
 217         }
 218
 219         memcpy(req.bssid, selected->bssid, 6);
 220         req.channel = selected->chid;
 221         spin_unlock_irqrestore(&local->lock, flags);
 222
 223         PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=%pM"
 224                " channel=%d\n",
 225                dev->name, req.bssid, le16_to_cpu(req.channel));
 226         if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
 227                                  sizeof(req))) {
 228                 printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
 229         }
 230         local->last_join_time = jiffies;
 231 }
 232
 233
 234 static void hostap_report_scan_complete(local_info_t *local)
 235 {
 236         union iwreq_data wrqu;
 237
 238         /* Inform user space about new scan results (just empty event,
 239          * SIOCGIWSCAN can be used to fetch data */
 240         wrqu.data.length = 0;
 241         wrqu.data.flags = 0;
 242         wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
 243
 244         /* Allow SIOCGIWSCAN handling to occur since we have received
 245          * scanning result */
 246         local->scan_timestamp = 0;
 247 }
 248
 249
 250 /* Called only as a tasklet (software IRQ) */
 251 static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
 252                                     int left)
 253 {
 254         u16 *pos;
 255         int new_count, i;
 256         unsigned long flags;
 257         struct hfa384x_scan_result *res;
 258         struct hfa384x_hostscan_result *results, *prev;
 259
 260         if (left < 4) {
 261                 printk(KERN_DEBUG "%s: invalid scanresult info frame "
 262                        "length %d\n", local->dev->name, left);
 263                 return;
 264         }
 265
 266         pos = (u16 *) buf;
 267         pos++;
 268         pos++;
 269         left -= 4;
 270
 271         new_count = left / sizeof(struct hfa384x_scan_result);
 272         results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
 273                           GFP_ATOMIC);
 274         if (results == NULL)
 275                 return;
 276
 277         /* Convert to hostscan result format. */
 278         res = (struct hfa384x_scan_result *) pos;
 279         for (i = 0; i < new_count; i++) {
 280                 memcpy(&results[i], &res[i],
 281                        sizeof(struct hfa384x_scan_result));
 282                 results[i].atim = 0;
 283         }
 284
 285         spin_lock_irqsave(&local->lock, flags);
 286         local->last_scan_type = PRISM2_SCAN;
 287         prev = local->last_scan_results;
 288         local->last_scan_results = results;
 289         local->last_scan_results_count = new_count;
 290         spin_unlock_irqrestore(&local->lock, flags);
 291         kfree(prev);
 292
 293         hostap_report_scan_complete(local);
 294
 295         /* Perform rest of ScanResults handling later in scheduled task */
 296         set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
 297         schedule_work(&local->info_queue);
 298 }
 299
 300
 301 /* Called only as a tasklet (software IRQ) */
 302 static void prism2_info_hostscanresults(local_info_t *local,
 303                                         unsigned char *buf, int left)
 304 {
 305         int i, result_size, copy_len, new_count;
 306         struct hfa384x_hostscan_result *results, *prev;
 307         unsigned long flags;
 308         __le16 *pos;
 309         u8 *ptr;
 310
 311         wake_up_interruptible(&local->hostscan_wq);
 312
 313         if (left < 4) {
 314                 printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
 315                        "length %d\n", local->dev->name, left);
 316                 return;
 317         }
 318
 319         pos = (__le16 *) buf;
 320         copy_len = result_size = le16_to_cpu(*pos);
 321         if (result_size == 0) {
 322                 printk(KERN_DEBUG "%s: invalid result_size (0) in "
 323                        "hostscanresults\n", local->dev->name);
 324                 return;
 325         }
 326         if (copy_len > sizeof(struct hfa384x_hostscan_result))
 327                 copy_len = sizeof(struct hfa384x_hostscan_result);
 328
 329         pos++;
 330         pos++;
 331         left -= 4;
 332         ptr = (u8 *) pos;
 333
 334         new_count = left / result_size;
 335         results = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result),
 336                           GFP_ATOMIC);
 337         if (results == NULL)
 338                 return;
 339
 340         for (i = 0; i < new_count; i++) {
 341                 memcpy(&results[i], ptr, copy_len);
 342                 ptr += result_size;
 343                 left -= result_size;
 344         }
 345
 346         if (left) {
 347                 printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
 348                        local->dev->name, left, result_size);
 349         }
 350
 351         spin_lock_irqsave(&local->lock, flags);
 352         local->last_scan_type = PRISM2_HOSTSCAN;
 353         prev = local->last_scan_results;
 354         local->last_scan_results = results;
 355         local->last_scan_results_count = new_count;
 356         spin_unlock_irqrestore(&local->lock, flags);
 357         kfree(prev);
 358
 359         hostap_report_scan_complete(local);
 360 }
 361 #endif /* PRISM2_NO_STATION_MODES */
 362
 363
 364 /* Called only as a tasklet (software IRQ) */
 365 void hostap_info_process(local_info_t *local, struct sk_buff *skb)
 366 {
 367         struct hfa384x_info_frame *info;
 368         unsigned char *buf;
 369         int left;
 370 #ifndef PRISM2_NO_DEBUG
 371         int i;
 372 #endif /* PRISM2_NO_DEBUG */
 373
 374         info = (struct hfa384x_info_frame *) skb->data;
 375         buf = skb->data + sizeof(*info);
 376         left = skb->len - sizeof(*info);
 377
 378         switch (le16_to_cpu(info->type)) {
 379         case HFA384X_INFO_COMMTALLIES:
 380                 prism2_info_commtallies(local, buf, left);
 381                 break;
 382
 383 #ifndef PRISM2_NO_STATION_MODES
 384         case HFA384X_INFO_LINKSTATUS:
 385                 prism2_info_linkstatus(local, buf, left);
 386                 break;
 387
 388         case HFA384X_INFO_SCANRESULTS:
 389                 prism2_info_scanresults(local, buf, left);
 390                 break;
 391
 392         case HFA384X_INFO_HOSTSCANRESULTS:
 393                 prism2_info_hostscanresults(local, buf, left);
 394                 break;
 395 #endif /* PRISM2_NO_STATION_MODES */
 396
 397 #ifndef PRISM2_NO_DEBUG
 398         default:
 399                 PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
 400                        local->dev->name, le16_to_cpu(info->len),
 401                        le16_to_cpu(info->type));
 402                 PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
 403                 for (i = 0; i < (left < 100 ? left : 100); i++)
 404                         PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
 405                 PDEBUG2(DEBUG_EXTRA, "\n");
 406                 break;
 407 #endif /* PRISM2_NO_DEBUG */
 408         }
 409 }
 410
 411
 412 #ifndef PRISM2_NO_STATION_MODES
 413 static void handle_info_queue_linkstatus(local_info_t *local)
 414 {
 415         int val = local->prev_link_status;
 416         int connected;
 417         union iwreq_data wrqu;
 418
 419         connected =
 420                 val == HFA384X_LINKSTATUS_CONNECTED ||
 421                 val == HFA384X_LINKSTATUS_AP_CHANGE ||
 422                 val == HFA384X_LINKSTATUS_AP_IN_RANGE;
 423
 424         if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
 425                                  local->bssid, ETH_ALEN, 1) < 0) {
 426                 printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
 427                        "LinkStatus event\n", local->dev->name);
 428         } else {
 429                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=%pM\n",
 430                        local->dev->name,
 431                        (unsigned char *) local->bssid);
 432                 if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
 433                         hostap_add_sta(local->ap, local->bssid);
 434         }
 435
 436         /* Get BSSID if we have a valid AP address */
 437         if (connected) {
 438                 netif_carrier_on(local->dev);
 439                 netif_carrier_on(local->ddev);
 440                 memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
 441         } else {
 442                 netif_carrier_off(local->dev);
 443                 netif_carrier_off(local->ddev);
 444                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 445         }
 446         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 447
 448         /*
 449          * Filter out sequential disconnect events in order not to cause a
 450          * flood of SIOCGIWAP events that have a race condition with EAPOL
 451          * frames and can confuse wpa_supplicant about the current association
 452          * status.
 453          */
 454         if (connected || local->prev_linkstatus_connected)
 455                 wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
 456         local->prev_linkstatus_connected = connected;
 457 }
 458
 459
 460 static void handle_info_queue_scanresults(local_info_t *local)
 461 {
 462         if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
 463                 prism2_host_roaming(local);
 464
 465         if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
 466             memcmp(local->preferred_ap, "\x00\x00\x00\x00\x00\x00",
 467                    ETH_ALEN) != 0) {
 468                 /*
 469                  * Firmware seems to be getting into odd state in host_roaming
 470                  * mode 2 when hostscan is used without join command, so try
 471                  * to fix this by re-joining the current AP. This does not
 472                  * actually trigger a new association if the current AP is
 473                  * still in the scan results.
 474                  */
 475                 prism2_host_roaming(local);
 476         }
 477 }
 478
 479
 480 /* Called only as scheduled task after receiving info frames (used to avoid
 481  * pending too much time in HW IRQ handler). */
 482 static void handle_info_queue(struct work_struct *work)
 483 {
 484         local_info_t *local = container_of(work, local_info_t, info_queue);
 485
 486         if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
 487                                &local->pending_info))
 488                 handle_info_queue_linkstatus(local);
 489
 490         if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
 491                                &local->pending_info))
 492                 handle_info_queue_scanresults(local);
 493 }
 494 #endif /* PRISM2_NO_STATION_MODES */
 495
 496
 497 void hostap_info_init(local_info_t *local)
 498 {
 499         skb_queue_head_init(&local->info_list);
 500 #ifndef PRISM2_NO_STATION_MODES
 501         INIT_WORK(&local->info_queue, handle_info_queue);
 502 #endif /* PRISM2_NO_STATION_MODES */
 503 }
 504
 505
 506 EXPORT_SYMBOL(hostap_info_init);
 507 EXPORT_SYMBOL(hostap_info_process);