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