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 "hostap_wlan.h"
   6 #include "hostap.h"
   7 #include "hostap_ap.h"
   8
   9 /* Called only as a tasklet (software IRQ) */
  10 static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
  11                                       int left)
  12 {
  13         struct hfa384x_comm_tallies *tallies;
  14
  15         if (left < sizeof(struct hfa384x_comm_tallies)) {
  16                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
  17                        "info frame\n", local->dev->name, left);
  18                 return;
  19         }
  20
  21         tallies = (struct hfa384x_comm_tallies *) buf;
  22 #define ADD_COMM_TALLIES(name) \
  23 local->comm_tallies.name += le16_to_cpu(tallies->name)
  24         ADD_COMM_TALLIES(tx_unicast_frames);
  25         ADD_COMM_TALLIES(tx_multicast_frames);
  26         ADD_COMM_TALLIES(tx_fragments);
  27         ADD_COMM_TALLIES(tx_unicast_octets);
  28         ADD_COMM_TALLIES(tx_multicast_octets);
  29         ADD_COMM_TALLIES(tx_deferred_transmissions);
  30         ADD_COMM_TALLIES(tx_single_retry_frames);
  31         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  32         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  33         ADD_COMM_TALLIES(tx_discards);
  34         ADD_COMM_TALLIES(rx_unicast_frames);
  35         ADD_COMM_TALLIES(rx_multicast_frames);
  36         ADD_COMM_TALLIES(rx_fragments);
  37         ADD_COMM_TALLIES(rx_unicast_octets);
  38         ADD_COMM_TALLIES(rx_multicast_octets);
  39         ADD_COMM_TALLIES(rx_fcs_errors);
  40         ADD_COMM_TALLIES(rx_discards_no_buffer);
  41         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  42         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  43         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  44         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  45 #undef ADD_COMM_TALLIES
  46 }
  47
  48
  49 /* Called only as a tasklet (software IRQ) */
  50 static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
  51                                       int left)
  52 {
  53         struct hfa384x_comm_tallies32 *tallies;
  54
  55         if (left < sizeof(struct hfa384x_comm_tallies32)) {
  56                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
  57                        "info frame\n", local->dev->name, left);
  58                 return;
  59         }
  60
  61         tallies = (struct hfa384x_comm_tallies32 *) buf;
  62 #define ADD_COMM_TALLIES(name) \
  63 local->comm_tallies.name += le32_to_cpu(tallies->name)
  64         ADD_COMM_TALLIES(tx_unicast_frames);
  65         ADD_COMM_TALLIES(tx_multicast_frames);
  66         ADD_COMM_TALLIES(tx_fragments);
  67         ADD_COMM_TALLIES(tx_unicast_octets);
  68         ADD_COMM_TALLIES(tx_multicast_octets);
  69         ADD_COMM_TALLIES(tx_deferred_transmissions);
  70         ADD_COMM_TALLIES(tx_single_retry_frames);
  71         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  72         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  73         ADD_COMM_TALLIES(tx_discards);
  74         ADD_COMM_TALLIES(rx_unicast_frames);
  75         ADD_COMM_TALLIES(rx_multicast_frames);
  76         ADD_COMM_TALLIES(rx_fragments);
  77         ADD_COMM_TALLIES(rx_unicast_octets);
  78         ADD_COMM_TALLIES(rx_multicast_octets);
  79         ADD_COMM_TALLIES(rx_fcs_errors);
  80         ADD_COMM_TALLIES(rx_discards_no_buffer);
  81         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  82         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  83         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  84         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  85 #undef ADD_COMM_TALLIES
  86 }
  87
  88
  89 /* Called only as a tasklet (software IRQ) */
  90 static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
  91                                     int left)
  92 {
  93         if (local->tallies32)
  94                 prism2_info_commtallies32(local, buf, left);
  95         else
  96                 prism2_info_commtallies16(local, buf, left);
  97 }
  98
  99
 100 #ifndef PRISM2_NO_STATION_MODES
 101 #ifndef PRISM2_NO_DEBUG
 102 static const char* hfa384x_linkstatus_str(u16 linkstatus)
 103 {
 104         switch (linkstatus) {
 105         case HFA384X_LINKSTATUS_CONNECTED:
 106                 return "Connected";
 107         case HFA384X_LINKSTATUS_DISCONNECTED:
 108                 return "Disconnected";
 109         case HFA384X_LINKSTATUS_AP_CHANGE:
 110                 return "Access point change";
 111         case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
 112                 return "Access point out of range";
 113         case HFA384X_LINKSTATUS_AP_IN_RANGE:
 114                 return "Access point in range";
 115         case HFA384X_LINKSTATUS_ASSOC_FAILED:
 116                 return "Association failed";
 117         default:
 118                 return "Unknown";
 119         }
 120 }
 121 #endif /* PRISM2_NO_DEBUG */
 122
 123
 124 /* Called only as a tasklet (software IRQ) */
 125 static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
 126                                     int left)
 127 {
 128         u16 val;
 129         int non_sta_mode;
 130
 131         /* Alloc new JoinRequests to occur since LinkStatus for the previous
 132          * has been received */
 133         local->last_join_time = 0;
 134
 135         if (left != 2) {
 136                 printk(KERN_DEBUG "%s: invalid linkstatus info frame "
 137                        "length %d\n", local->dev->name, left);
 138                 return;
 139         }
 140
 141         non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
 142                 local->iw_mode == IW_MODE_REPEAT ||
 143                 local->iw_mode == IW_MODE_MONITOR;
 144
 145         val = buf[0] | (buf[1] << 8);
 146         if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
 147                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
 148                        local->dev->name, val, hfa384x_linkstatus_str(val));
 149         }
 150
 151         if (non_sta_mode) {
 152                 netif_carrier_on(local->dev);
 153                 netif_carrier_on(local->ddev);
 154                 return;
 155         }
 156
 157         /* Get current BSSID later in scheduled task */
 158         set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
 159         local->prev_link_status = val;
 160         schedule_work(&local->info_queue);
 161 }
 162
 163
 164 static void prism2_host_roaming(local_info_t *local)
 165 {
 166         struct hfa384x_join_request req;
 167         struct net_device *dev = local->dev;
 168         struct hfa384x_hostscan_result *selected, *entry;
 169         int i;
 170         unsigned long flags;
 171
 172         if (local->last_join_time &&
 173             time_before(jiffies, local->last_join_time + 10 * HZ)) {
 174                 PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
 175                        "completed - waiting for it before issuing new one\n",
 176                        dev->name);
 177                 return;
 178         }
 179
 180         /* ScanResults are sorted: first ESS results in decreasing signal
 181          * quality then IBSS results in similar order.
 182          * Trivial roaming policy: just select the first entry.
 183          * This could probably be improved by adding hysteresis to limit
 184          * number of handoffs, etc.
 185          *
 186          * Could do periodic RID_SCANREQUEST or Inquire F101 to get new
 187          * ScanResults */
 188         spin_lock_irqsave(&local->lock, flags);
 189         if (local->last_scan_results == NULL ||
 190             local->last_scan_results_count == 0) {
 191                 spin_unlock_irqrestore(&local->lock, flags);
 192                 PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
 193                        dev->name);
 194                 return;
 195         }
 196
 197         selected = &local->last_scan_results[0];
 198
 199         if (local->preferred_ap[0] || local->preferred_ap[1] ||
 200             local->preferred_ap[2] || local->preferred_ap[3] ||
 201             local->preferred_ap[4] || local->preferred_ap[5]) {
 202                 /* Try to find preferred AP */
 203                 PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID %pM\n",
 204                        dev->name, 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=%pM"
 222                " channel=%d\n",
 223                dev->name, 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         __le16 *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 = (__le16 *) 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 (le16_to_cpu(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, le16_to_cpu(info->len),
 399                        le16_to_cpu(info->type));
 400                 PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
 401                 for (i = 0; i < (left < 100 ? left : 100); i++)
 402                         PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
 403                 PDEBUG2(DEBUG_EXTRA, "\n");
 404                 break;
 405 #endif /* PRISM2_NO_DEBUG */
 406         }
 407 }
 408
 409
 410 #ifndef PRISM2_NO_STATION_MODES
 411 static void handle_info_queue_linkstatus(local_info_t *local)
 412 {
 413         int val = local->prev_link_status;
 414         int connected;
 415         union iwreq_data wrqu;
 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=%pM\n",
 428                        local->dev->name,
 429                        (unsigned char *) local->bssid);
 430                 if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
 431                         hostap_add_sta(local->ap, local->bssid);
 432         }
 433
 434         /* Get BSSID if we have a valid AP address */
 435         if (connected) {
 436                 netif_carrier_on(local->dev);
 437                 netif_carrier_on(local->ddev);
 438                 memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
 439         } else {
 440                 netif_carrier_off(local->dev);
 441                 netif_carrier_off(local->ddev);
 442                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
 443         }
 444         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 445
 446         /*
 447          * Filter out sequential disconnect events in order not to cause a
 448          * flood of SIOCGIWAP events that have a race condition with EAPOL
 449          * frames and can confuse wpa_supplicant about the current association
 450          * status.
 451          */
 452         if (connected || local->prev_linkstatus_connected)
 453                 wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
 454         local->prev_linkstatus_connected = connected;
 455 }
 456
 457
 458 static void handle_info_queue_scanresults(local_info_t *local)
 459 {
 460         if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
 461                 prism2_host_roaming(local);
 462
 463         if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
 464             memcmp(local->preferred_ap, "\x00\x00\x00\x00\x00\x00",
 465                    ETH_ALEN) != 0) {
 466                 /*
 467                  * Firmware seems to be getting into odd state in host_roaming
 468                  * mode 2 when hostscan is used without join command, so try
 469                  * to fix this by re-joining the current AP. This does not
 470                  * actually trigger a new association if the current AP is
 471                  * still in the scan results.
 472                  */
 473                 prism2_host_roaming(local);
 474         }
 475 }
 476
 477
 478 /* Called only as scheduled task after receiving info frames (used to avoid
 479  * pending too much time in HW IRQ handler). */
 480 static void handle_info_queue(struct work_struct *work)
 481 {
 482         local_info_t *local = container_of(work, local_info_t, info_queue);
 483
 484         if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
 485                                &local->pending_info))
 486                 handle_info_queue_linkstatus(local);
 487
 488         if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
 489                                &local->pending_info))
 490                 handle_info_queue_scanresults(local);
 491 }
 492 #endif /* PRISM2_NO_STATION_MODES */
 493
 494
 495 void hostap_info_init(local_info_t *local)
 496 {
 497         skb_queue_head_init(&local->info_list);
 498 #ifndef PRISM2_NO_STATION_MODES
 499         INIT_WORK(&local->info_queue, handle_info_queue);
 500 #endif /* PRISM2_NO_STATION_MODES */
 501 }
 502
 503
 504 EXPORT_SYMBOL(hostap_info_init);
 505 EXPORT_SYMBOL(hostap_info_process);