drivers/net/wireless/intersil/hostap/hostap_info.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Host AP driver Info Frame processing (part of hostap.o module) */
   3
   4 #include <linux/if_arp.h>
   5 #include <linux/sched.h>
   6 #include <linux/slab.h>
   7 #include <linux/export.h>
   8 #include <linux/etherdevice.h>
   9 #include "hostap_wlan.h"
  10 #include "hostap.h"
  11 #include "hostap_ap.h"
  12
  13 /* Called only as a tasklet (software IRQ) */
  14 static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
  15                                       int left)
  16 {
  17         struct hfa384x_comm_tallies *tallies;
  18
  19         if (left < sizeof(struct hfa384x_comm_tallies)) {
  20                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
  21                        "info frame\n", local->dev->name, left);
  22                 return;
  23         }
  24
  25         tallies = (struct hfa384x_comm_tallies *) buf;
  26 #define ADD_COMM_TALLIES(name) \
  27 local->comm_tallies.name += le16_to_cpu(tallies->name)
  28         ADD_COMM_TALLIES(tx_unicast_frames);
  29         ADD_COMM_TALLIES(tx_multicast_frames);
  30         ADD_COMM_TALLIES(tx_fragments);
  31         ADD_COMM_TALLIES(tx_unicast_octets);
  32         ADD_COMM_TALLIES(tx_multicast_octets);
  33         ADD_COMM_TALLIES(tx_deferred_transmissions);
  34         ADD_COMM_TALLIES(tx_single_retry_frames);
  35         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  36         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  37         ADD_COMM_TALLIES(tx_discards);
  38         ADD_COMM_TALLIES(rx_unicast_frames);
  39         ADD_COMM_TALLIES(rx_multicast_frames);
  40         ADD_COMM_TALLIES(rx_fragments);
  41         ADD_COMM_TALLIES(rx_unicast_octets);
  42         ADD_COMM_TALLIES(rx_multicast_octets);
  43         ADD_COMM_TALLIES(rx_fcs_errors);
  44         ADD_COMM_TALLIES(rx_discards_no_buffer);
  45         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  46         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  47         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  48         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  49 #undef ADD_COMM_TALLIES
  50 }
  51
  52
  53 /* Called only as a tasklet (software IRQ) */
  54 static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
  55                                       int left)
  56 {
  57         struct hfa384x_comm_tallies32 *tallies;
  58
  59         if (left < sizeof(struct hfa384x_comm_tallies32)) {
  60                 printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
  61                        "info frame\n", local->dev->name, left);
  62                 return;
  63         }
  64
  65         tallies = (struct hfa384x_comm_tallies32 *) buf;
  66 #define ADD_COMM_TALLIES(name) \
  67 local->comm_tallies.name += le32_to_cpu(tallies->name)
  68         ADD_COMM_TALLIES(tx_unicast_frames);
  69         ADD_COMM_TALLIES(tx_multicast_frames);
  70         ADD_COMM_TALLIES(tx_fragments);
  71         ADD_COMM_TALLIES(tx_unicast_octets);
  72         ADD_COMM_TALLIES(tx_multicast_octets);
  73         ADD_COMM_TALLIES(tx_deferred_transmissions);
  74         ADD_COMM_TALLIES(tx_single_retry_frames);
  75         ADD_COMM_TALLIES(tx_multiple_retry_frames);
  76         ADD_COMM_TALLIES(tx_retry_limit_exceeded);
  77         ADD_COMM_TALLIES(tx_discards);
  78         ADD_COMM_TALLIES(rx_unicast_frames);
  79         ADD_COMM_TALLIES(rx_multicast_frames);
  80         ADD_COMM_TALLIES(rx_fragments);
  81         ADD_COMM_TALLIES(rx_unicast_octets);
  82         ADD_COMM_TALLIES(rx_multicast_octets);
  83         ADD_COMM_TALLIES(rx_fcs_errors);
  84         ADD_COMM_TALLIES(rx_discards_no_buffer);
  85         ADD_COMM_TALLIES(tx_discards_wrong_sa);
  86         ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
  87         ADD_COMM_TALLIES(rx_message_in_msg_fragments);
  88         ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
  89 #undef ADD_COMM_TALLIES
  90 }
  91
  92
  93 /* Called only as a tasklet (software IRQ) */
  94 static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
  95                                     int left)
  96 {
  97         if (local->tallies32)
  98                 prism2_info_commtallies32(local, buf, left);
  99         else
 100                 prism2_info_commtallies16(local, buf, left);
 101 }
 102
 103
 104 #ifndef PRISM2_NO_STATION_MODES
 105 #ifndef PRISM2_NO_DEBUG
 106 static const char* hfa384x_linkstatus_str(u16 linkstatus)
 107 {
 108         switch (linkstatus) {
 109         case HFA384X_LINKSTATUS_CONNECTED:
 110                 return "Connected";
 111         case HFA384X_LINKSTATUS_DISCONNECTED:
 112                 return "Disconnected";
 113         case HFA384X_LINKSTATUS_AP_CHANGE:
 114                 return "Access point change";
 115         case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
 116                 return "Access point out of range";
 117         case HFA384X_LINKSTATUS_AP_IN_RANGE:
 118                 return "Access point in range";
 119         case HFA384X_LINKSTATUS_ASSOC_FAILED:
 120                 return "Association failed";
 121         default:
 122                 return "Unknown";
 123         }
 124 }
 125 #endif /* PRISM2_NO_DEBUG */
 126
 127
 128 /* Called only as a tasklet (software IRQ) */
 129 static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
 130                                     int left)
 131 {
 132         u16 val;
 133         int non_sta_mode;
 134
 135         /* Alloc new JoinRequests to occur since LinkStatus for the previous
 136          * has been received */
 137         local->last_join_time = 0;
 138
 139         if (left != 2) {
 140                 printk(KERN_DEBUG "%s: invalid linkstatus info frame "
 141                        "length %d\n", local->dev->name, left);
 142                 return;
 143         }
 144
 145         non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
 146                 local->iw_mode == IW_MODE_REPEAT ||
 147                 local->iw_mode == IW_MODE_MONITOR;
 148
 149         val = buf[0] | (buf[1] << 8);
 150         if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
 151                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
 152                        local->dev->name, val, hfa384x_linkstatus_str(val));
 153         }
 154
 155         if (non_sta_mode) {
 156                 netif_carrier_on(local->dev);
 157                 netif_carrier_on(local->ddev);
 158                 return;
 159         }
 160
 161         /* Get current BSSID later in scheduled task */
 162         set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
 163         local->prev_link_status = val;
 164         schedule_work(&local->info_queue);
 165 }
 166
 167
 168 static void prism2_host_roaming(local_info_t *local)
 169 {
 170         struct hfa384x_join_request req;
 171         struct net_device *dev = local->dev;
 172         struct hfa384x_hostscan_result *selected, *entry;
 173         int i;
 174         unsigned long flags;
 175
 176         if (local->last_join_time &&
 177             time_before(jiffies, local->last_join_time + 10 * HZ)) {
 178                 PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
 179                        "completed - waiting for it before issuing new one\n",
 180                        dev->name);
 181                 return;
 182         }
 183
 184         /* ScanResults are sorted: first ESS results in decreasing signal
 185          * quality then IBSS results in similar order.
 186          * Trivial roaming policy: just select the first entry.
 187          * This could probably be improved by adding hysteresis to limit
 188          * number of handoffs, etc.
 189          *
 190          * Could do periodic RID_SCANREQUEST or Inquire F101 to get new
 191          * ScanResults */
 192         spin_lock_irqsave(&local->lock, flags);
 193         if (local->last_scan_results == NULL ||
 194             local->last_scan_results_count == 0) {
 195                 spin_unlock_irqrestore(&local->lock, flags);
 196                 PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
 197                        dev->name);
 198                 return;
 199         }
 200
 201         selected = &local->last_scan_results[0];
 202
 203         if (local->preferred_ap[0] || local->preferred_ap[1] ||
 204             local->preferred_ap[2] || local->preferred_ap[3] ||
 205             local->preferred_ap[4] || local->preferred_ap[5]) {
 206                 /* Try to find preferred AP */
 207                 PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID %pM\n",
 208                        dev->name, local->preferred_ap);
 209                 for (i = 0; i < local->last_scan_results_count; i++) {
 210                         entry = &local->last_scan_results[i];
 211                         if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
 212                         {
 213                                 PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
 214                                        "selection\n", dev->name);
 215                                 selected = entry;
 216                                 break;
 217                         }
 218                 }
 219         }
 220
 221         memcpy(req.bssid, selected->bssid, ETH_ALEN);
 222         req.channel = selected->chid;
 223         spin_unlock_irqrestore(&local->lock, flags);
 224
 225         PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=%pM"
 226                " channel=%d\n",
 227                dev->name, req.bssid, le16_to_cpu(req.channel));
 228         if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
 229                                  sizeof(req))) {
 230                 printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
 231         }
 232         local->last_join_time = jiffies;
 233 }
 234
 235
 236 static void hostap_report_scan_complete(local_info_t *local)
 237 {
 238         union iwreq_data wrqu;
 239
 240         /* Inform user space about new scan results (just empty event,
 241          * SIOCGIWSCAN can be used to fetch data */
 242         wrqu.data.length = 0;
 243         wrqu.data.flags = 0;
 244         wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
 245
 246         /* Allow SIOCGIWSCAN handling to occur since we have received
 247          * scanning result */
 248         local->scan_timestamp = 0;
 249 }
 250
 251
 252 /* Called only as a tasklet (software IRQ) */
 253 static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
 254                                     int left)
 255 {
 256         u16 *pos;
 257         int new_count, i;
 258         unsigned long flags;
 259         struct hfa384x_scan_result *res;
 260         struct hfa384x_hostscan_result *results, *prev;
 261
 262         if (left < 4) {
 263                 printk(KERN_DEBUG "%s: invalid scanresult info frame "
 264                        "length %d\n", local->dev->name, left);
 265                 return;
 266         }
 267
 268         pos = (u16 *) buf;
 269         pos++;
 270         pos++;
 271         left -= 4;
 272
 273         new_count = left / sizeof(struct hfa384x_scan_result);
 274         results = kmalloc(new_count * sizeof(struct hfa384x_hostscan_result),
 275                           GFP_ATOMIC);
 276         if (results == NULL)
 277                 return;
 278
 279         /* Convert to hostscan result format. */
 280         res = (struct hfa384x_scan_result *) pos;
 281         for (i = 0; i < new_count; i++) {
 282                 memcpy(&results[i], &res[i],
 283                        sizeof(struct hfa384x_scan_result));
 284                 results[i].atim = 0;
 285         }
 286
 287         spin_lock_irqsave(&local->lock, flags);
 288         local->last_scan_type = PRISM2_SCAN;
 289         prev = local->last_scan_results;
 290         local->last_scan_results = results;
 291         local->last_scan_results_count = new_count;
 292         spin_unlock_irqrestore(&local->lock, flags);
 293         kfree(prev);
 294
 295         hostap_report_scan_complete(local);
 296
 297         /* Perform rest of ScanResults handling later in scheduled task */
 298         set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
 299         schedule_work(&local->info_queue);
 300 }
 301
 302
 303 /* Called only as a tasklet (software IRQ) */
 304 static void prism2_info_hostscanresults(local_info_t *local,
 305                                         unsigned char *buf, int left)
 306 {
 307         int i, result_size, copy_len, new_count;
 308         struct hfa384x_hostscan_result *results, *prev;
 309         unsigned long flags;
 310         __le16 *pos;
 311         u8 *ptr;
 312
 313         wake_up_interruptible(&local->hostscan_wq);
 314
 315         if (left < 4) {
 316                 printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
 317                        "length %d\n", local->dev->name, left);
 318                 return;
 319         }
 320
 321         pos = (__le16 *) buf;
 322         copy_len = result_size = le16_to_cpu(*pos);
 323         if (result_size == 0) {
 324                 printk(KERN_DEBUG "%s: invalid result_size (0) in "
 325                        "hostscanresults\n", local->dev->name);
 326                 return;
 327         }
 328         if (copy_len > sizeof(struct hfa384x_hostscan_result))
 329                 copy_len = sizeof(struct hfa384x_hostscan_result);
 330
 331         pos++;
 332         pos++;
 333         left -= 4;
 334         ptr = (u8 *) pos;
 335
 336         new_count = left / result_size;
 337         results = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result),
 338                           GFP_ATOMIC);
 339         if (results == NULL)
 340                 return;
 341
 342         for (i = 0; i < new_count; i++) {
 343                 memcpy(&results[i], ptr, copy_len);
 344                 ptr += result_size;
 345                 left -= result_size;
 346         }
 347
 348         if (left) {
 349                 printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
 350                        local->dev->name, left, result_size);
 351         }
 352
 353         spin_lock_irqsave(&local->lock, flags);
 354         local->last_scan_type = PRISM2_HOSTSCAN;
 355         prev = local->last_scan_results;
 356         local->last_scan_results = results;
 357         local->last_scan_results_count = new_count;
 358         spin_unlock_irqrestore(&local->lock, flags);
 359         kfree(prev);
 360
 361         hostap_report_scan_complete(local);
 362 }
 363 #endif /* PRISM2_NO_STATION_MODES */
 364
 365
 366 /* Called only as a tasklet (software IRQ) */
 367 void hostap_info_process(local_info_t *local, struct sk_buff *skb)
 368 {
 369         struct hfa384x_info_frame *info;
 370         unsigned char *buf;
 371         int left;
 372 #ifndef PRISM2_NO_DEBUG
 373         int i;
 374 #endif /* PRISM2_NO_DEBUG */
 375
 376         info = (struct hfa384x_info_frame *) skb->data;
 377         buf = skb->data + sizeof(*info);
 378         left = skb->len - sizeof(*info);
 379
 380         switch (le16_to_cpu(info->type)) {
 381         case HFA384X_INFO_COMMTALLIES:
 382                 prism2_info_commtallies(local, buf, left);
 383                 break;
 384
 385 #ifndef PRISM2_NO_STATION_MODES
 386         case HFA384X_INFO_LINKSTATUS:
 387                 prism2_info_linkstatus(local, buf, left);
 388                 break;
 389
 390         case HFA384X_INFO_SCANRESULTS:
 391                 prism2_info_scanresults(local, buf, left);
 392                 break;
 393
 394         case HFA384X_INFO_HOSTSCANRESULTS:
 395                 prism2_info_hostscanresults(local, buf, left);
 396                 break;
 397 #endif /* PRISM2_NO_STATION_MODES */
 398
 399 #ifndef PRISM2_NO_DEBUG
 400         default:
 401                 PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
 402                        local->dev->name, le16_to_cpu(info->len),
 403                        le16_to_cpu(info->type));
 404                 PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
 405                 for (i = 0; i < (left < 100 ? left : 100); i++)
 406                         PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
 407                 PDEBUG2(DEBUG_EXTRA, "\n");
 408                 break;
 409 #endif /* PRISM2_NO_DEBUG */
 410         }
 411 }
 412
 413
 414 #ifndef PRISM2_NO_STATION_MODES
 415 static void handle_info_queue_linkstatus(local_info_t *local)
 416 {
 417         int val = local->prev_link_status;
 418         int connected;
 419         union iwreq_data wrqu;
 420
 421         connected =
 422                 val == HFA384X_LINKSTATUS_CONNECTED ||
 423                 val == HFA384X_LINKSTATUS_AP_CHANGE ||
 424                 val == HFA384X_LINKSTATUS_AP_IN_RANGE;
 425
 426         if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
 427                                  local->bssid, ETH_ALEN, 1) < 0) {
 428                 printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
 429                        "LinkStatus event\n", local->dev->name);
 430         } else {
 431                 PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=%pM\n",
 432                        local->dev->name,
 433                        (unsigned char *) local->bssid);
 434                 if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
 435                         hostap_add_sta(local->ap, local->bssid);
 436         }
 437
 438         /* Get BSSID if we have a valid AP address */
 439         if (connected) {
 440                 netif_carrier_on(local->dev);
 441                 netif_carrier_on(local->ddev);
 442                 memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
 443         } else {
 444                 netif_carrier_off(local->dev);
 445                 netif_carrier_off(local->ddev);
 446                 eth_zero_addr(wrqu.ap_addr.sa_data);
 447         }
 448         wrqu.ap_addr.sa_family = ARPHRD_ETHER;
 449
 450         /*
 451          * Filter out sequential disconnect events in order not to cause a
 452          * flood of SIOCGIWAP events that have a race condition with EAPOL
 453          * frames and can confuse wpa_supplicant about the current association
 454          * status.
 455          */
 456         if (connected || local->prev_linkstatus_connected)
 457                 wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
 458         local->prev_linkstatus_connected = connected;
 459 }
 460
 461
 462 static void handle_info_queue_scanresults(local_info_t *local)
 463 {
 464         if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
 465                 prism2_host_roaming(local);
 466
 467         if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
 468             !is_zero_ether_addr(local->preferred_ap)) {
 469                 /*
 470                  * Firmware seems to be getting into odd state in host_roaming
 471                  * mode 2 when hostscan is used without join command, so try
 472                  * to fix this by re-joining the current AP. This does not
 473                  * actually trigger a new association if the current AP is
 474                  * still in the scan results.
 475                  */
 476                 prism2_host_roaming(local);
 477         }
 478 }
 479
 480
 481 /* Called only as scheduled task after receiving info frames (used to avoid
 482  * pending too much time in HW IRQ handler). */
 483 static void handle_info_queue(struct work_struct *work)
 484 {
 485         local_info_t *local = container_of(work, local_info_t, info_queue);
 486
 487         if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
 488                                &local->pending_info))
 489                 handle_info_queue_linkstatus(local);
 490
 491         if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
 492                                &local->pending_info))
 493                 handle_info_queue_scanresults(local);
 494 }
 495 #endif /* PRISM2_NO_STATION_MODES */
 496
 497
 498 void hostap_info_init(local_info_t *local)
 499 {
 500         skb_queue_head_init(&local->info_list);
 501 #ifndef PRISM2_NO_STATION_MODES
 502         INIT_WORK(&local->info_queue, handle_info_queue);
 503 #endif /* PRISM2_NO_STATION_MODES */
 504 }
 505
 506
 507 EXPORT_SYMBOL(hostap_info_init);
 508 EXPORT_SYMBOL(hostap_info_process);