LXR linux/drivers/net/wireless/hostap/hostap

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