net/mac80211/ieee80211.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <net/iw_handler.h>
  24 #include <linux/compiler.h>
  25 #include <linux/bitmap.h>
  26 #include <net/cfg80211.h>
  27 #include <asm/unaligned.h>
  28
  29 #include "ieee80211_common.h"
  30 #include "ieee80211_i.h"
  31 #include "ieee80211_rate.h"
  32 #include "wep.h"
  33 #include "wpa.h"
  34 #include "tkip.h"
  35 #include "wme.h"
  36 #include "aes_ccm.h"
  37 #include "ieee80211_led.h"
  38 #include "ieee80211_cfg.h"
  39 #include "debugfs.h"
  40 #include "debugfs_netdev.h"
  41 #include "debugfs_key.h"
  42
  43 /* privid for wiphys to determine whether they belong to us or not */
  44 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  45
  46 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  47 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  48 static const unsigned char rfc1042_header[] =
  49         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  50
  51 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  52 static const unsigned char bridge_tunnel_header[] =
  53         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  54
  55 /* No encapsulation header if EtherType < 0x600 (=length) */
  56 static const unsigned char eapol_header[] =
  57         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
  58
  59
  60 /*
  61  * For seeing transmitted packets on monitor interfaces
  62  * we have a radiotap header too.
  63  */
  64 struct ieee80211_tx_status_rtap_hdr {
  65         struct ieee80211_radiotap_header hdr;
  66         __le16 tx_flags;
  67         u8 data_retries;
  68 } __attribute__ ((packed));
  69
  70
  71 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
  72                                               struct ieee80211_hdr *hdr)
  73 {
  74         /* Set the sequence number for this frame. */
  75         hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
  76
  77         /* Increase the sequence number. */
  78         sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
  79 }
  80
  81 struct ieee80211_key_conf *
  82 ieee80211_key_data2conf(struct ieee80211_local *local,
  83                         const struct ieee80211_key *data)
  84 {
  85         struct ieee80211_key_conf *conf;
  86
  87         conf = kmalloc(sizeof(*conf) + data->keylen, GFP_ATOMIC);
  88         if (!conf)
  89                 return NULL;
  90
  91         conf->hw_key_idx = data->hw_key_idx;
  92         conf->alg = data->alg;
  93         conf->keylen = data->keylen;
  94         conf->flags = 0;
  95         if (data->force_sw_encrypt)
  96                 conf->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
  97         conf->keyidx = data->keyidx;
  98         if (data->default_tx_key)
  99                 conf->flags |= IEEE80211_KEY_DEFAULT_TX_KEY;
 100         if (local->default_wep_only)
 101                 conf->flags |= IEEE80211_KEY_DEFAULT_WEP_ONLY;
 102         memcpy(conf->key, data->key, data->keylen);
 103
 104         return conf;
 105 }
 106
 107 struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
 108                                           int idx, size_t key_len, gfp_t flags)
 109 {
 110         struct ieee80211_key *key;
 111
 112         key = kzalloc(sizeof(struct ieee80211_key) + key_len, flags);
 113         if (!key)
 114                 return NULL;
 115         kref_init(&key->kref);
 116         return key;
 117 }
 118
 119 static void ieee80211_key_release(struct kref *kref)
 120 {
 121         struct ieee80211_key *key;
 122
 123         key = container_of(kref, struct ieee80211_key, kref);
 124         if (key->alg == ALG_CCMP)
 125                 ieee80211_aes_key_free(key->u.ccmp.tfm);
 126         ieee80211_debugfs_key_remove(key);
 127         kfree(key);
 128 }
 129
 130 void ieee80211_key_free(struct ieee80211_key *key)
 131 {
 132         if (key)
 133                 kref_put(&key->kref, ieee80211_key_release);
 134 }
 135
 136 static int rate_list_match(const int *rate_list, int rate)
 137 {
 138         int i;
 139
 140         if (!rate_list)
 141                 return 0;
 142
 143         for (i = 0; rate_list[i] >= 0; i++)
 144                 if (rate_list[i] == rate)
 145                         return 1;
 146
 147         return 0;
 148 }
 149
 150
 151 void ieee80211_prepare_rates(struct ieee80211_local *local,
 152                              struct ieee80211_hw_mode *mode)
 153 {
 154         int i;
 155
 156         for (i = 0; i < mode->num_rates; i++) {
 157                 struct ieee80211_rate *rate = &mode->rates[i];
 158
 159                 rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
 160                                  IEEE80211_RATE_BASIC);
 161
 162                 if (local->supp_rates[mode->mode]) {
 163                         if (!rate_list_match(local->supp_rates[mode->mode],
 164                                              rate->rate))
 165                                 continue;
 166                 }
 167
 168                 rate->flags |= IEEE80211_RATE_SUPPORTED;
 169
 170                 /* Use configured basic rate set if it is available. If not,
 171                  * use defaults that are sane for most cases. */
 172                 if (local->basic_rates[mode->mode]) {
 173                         if (rate_list_match(local->basic_rates[mode->mode],
 174                                             rate->rate))
 175                                 rate->flags |= IEEE80211_RATE_BASIC;
 176                 } else switch (mode->mode) {
 177                 case MODE_IEEE80211A:
 178                         if (rate->rate == 60 || rate->rate == 120 ||
 179                             rate->rate == 240)
 180                                 rate->flags |= IEEE80211_RATE_BASIC;
 181                         break;
 182                 case MODE_IEEE80211B:
 183                         if (rate->rate == 10 || rate->rate == 20)
 184                                 rate->flags |= IEEE80211_RATE_BASIC;
 185                         break;
 186                 case MODE_ATHEROS_TURBO:
 187                         if (rate->rate == 120 || rate->rate == 240 ||
 188                             rate->rate == 480)
 189                                 rate->flags |= IEEE80211_RATE_BASIC;
 190                         break;
 191                 case MODE_IEEE80211G:
 192                         if (rate->rate == 10 || rate->rate == 20 ||
 193                             rate->rate == 55 || rate->rate == 110)
 194                                 rate->flags |= IEEE80211_RATE_BASIC;
 195                         break;
 196                 }
 197
 198                 /* Set ERP and MANDATORY flags based on phymode */
 199                 switch (mode->mode) {
 200                 case MODE_IEEE80211A:
 201                         if (rate->rate == 60 || rate->rate == 120 ||
 202                             rate->rate == 240)
 203                                 rate->flags |= IEEE80211_RATE_MANDATORY;
 204                         break;
 205                 case MODE_IEEE80211B:
 206                         if (rate->rate == 10)
 207                                 rate->flags |= IEEE80211_RATE_MANDATORY;
 208                         break;
 209                 case MODE_ATHEROS_TURBO:
 210                         break;
 211                 case MODE_IEEE80211G:
 212                         if (rate->rate == 10 || rate->rate == 20 ||
 213                             rate->rate == 55 || rate->rate == 110 ||
 214                             rate->rate == 60 || rate->rate == 120 ||
 215                             rate->rate == 240)
 216                                 rate->flags |= IEEE80211_RATE_MANDATORY;
 217                         break;
 218                 }
 219                 if (ieee80211_is_erp_rate(mode->mode, rate->rate))
 220                         rate->flags |= IEEE80211_RATE_ERP;
 221         }
 222 }
 223
 224
 225 static void ieee80211_key_threshold_notify(struct net_device *dev,
 226                                            struct ieee80211_key *key,
 227                                            struct sta_info *sta)
 228 {
 229         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 230         struct sk_buff *skb;
 231         struct ieee80211_msg_key_notification *msg;
 232
 233         /* if no one will get it anyway, don't even allocate it.
 234          * unlikely because this is only relevant for APs
 235          * where the device must be open... */
 236         if (unlikely(!local->apdev))
 237                 return;
 238
 239         skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
 240                             sizeof(struct ieee80211_msg_key_notification));
 241         if (!skb)
 242                 return;
 243
 244         skb_reserve(skb, sizeof(struct ieee80211_frame_info));
 245         msg = (struct ieee80211_msg_key_notification *)
 246                 skb_put(skb, sizeof(struct ieee80211_msg_key_notification));
 247         msg->tx_rx_count = key->tx_rx_count;
 248         memcpy(msg->ifname, dev->name, IFNAMSIZ);
 249         if (sta)
 250                 memcpy(msg->addr, sta->addr, ETH_ALEN);
 251         else
 252                 memset(msg->addr, 0xff, ETH_ALEN);
 253
 254         key->tx_rx_count = 0;
 255
 256         ieee80211_rx_mgmt(local, skb, NULL,
 257                           ieee80211_msg_key_threshold_notification);
 258 }
 259
 260
 261 static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
 262 {
 263         u16 fc;
 264
 265         if (len < 24)
 266                 return NULL;
 267
 268         fc = le16_to_cpu(hdr->frame_control);
 269
 270         switch (fc & IEEE80211_FCTL_FTYPE) {
 271         case IEEE80211_FTYPE_DATA:
 272                 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 273                 case IEEE80211_FCTL_TODS:
 274                         return hdr->addr1;
 275                 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 276                         return NULL;
 277                 case IEEE80211_FCTL_FROMDS:
 278                         return hdr->addr2;
 279                 case 0:
 280                         return hdr->addr3;
 281                 }
 282                 break;
 283         case IEEE80211_FTYPE_MGMT:
 284                 return hdr->addr3;
 285         case IEEE80211_FTYPE_CTL:
 286                 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
 287                         return hdr->addr1;
 288                 else
 289                         return NULL;
 290         }
 291
 292         return NULL;
 293 }
 294
 295 int ieee80211_get_hdrlen(u16 fc)
 296 {
 297         int hdrlen = 24;
 298
 299         switch (fc & IEEE80211_FCTL_FTYPE) {
 300         case IEEE80211_FTYPE_DATA:
 301                 if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
 302                         hdrlen = 30; /* Addr4 */
 303                 /*
 304                  * The QoS Control field is two bytes and its presence is
 305                  * indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
 306                  * hdrlen if that bit is set.
 307                  * This works by masking out the bit and shifting it to
 308                  * bit position 1 so the result has the value 0 or 2.
 309                  */
 310                 hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
 311                                 >> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
 312                 break;
 313         case IEEE80211_FTYPE_CTL:
 314                 /*
 315                  * ACK and CTS are 10 bytes, all others 16. To see how
 316                  * to get this condition consider
 317                  *   subtype mask:   0b0000000011110000 (0x00F0)
 318                  *   ACK subtype:    0b0000000011010000 (0x00D0)
 319                  *   CTS subtype:    0b0000000011000000 (0x00C0)
 320                  *   bits that matter:         ^^^      (0x00E0)
 321                  *   value of those: 0b0000000011000000 (0x00C0)
 322                  */
 323                 if ((fc & 0xE0) == 0xC0)
 324                         hdrlen = 10;
 325                 else
 326                         hdrlen = 16;
 327                 break;
 328         }
 329
 330         return hdrlen;
 331 }
 332 EXPORT_SYMBOL(ieee80211_get_hdrlen);
 333
 334 int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 335 {
 336         const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
 337         int hdrlen;
 338
 339         if (unlikely(skb->len < 10))
 340                 return 0;
 341         hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
 342         if (unlikely(hdrlen > skb->len))
 343                 return 0;
 344         return hdrlen;
 345 }
 346 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 347
 348 static int ieee80211_get_radiotap_len(struct sk_buff *skb)
 349 {
 350         struct ieee80211_radiotap_header *hdr =
 351                 (struct ieee80211_radiotap_header *) skb->data;
 352
 353         return le16_to_cpu(hdr->it_len);
 354 }
 355
 356 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
 357 static void ieee80211_dump_frame(const char *ifname, const char *title,
 358                                  const struct sk_buff *skb)
 359 {
 360         const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 361         u16 fc;
 362         int hdrlen;
 363
 364         printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
 365         if (skb->len < 4) {
 366                 printk("\n");
 367                 return;
 368         }
 369
 370         fc = le16_to_cpu(hdr->frame_control);
 371         hdrlen = ieee80211_get_hdrlen(fc);
 372         if (hdrlen > skb->len)
 373                 hdrlen = skb->len;
 374         if (hdrlen >= 4)
 375                 printk(" FC=0x%04x DUR=0x%04x",
 376                        fc, le16_to_cpu(hdr->duration_id));
 377         if (hdrlen >= 10)
 378                 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
 379         if (hdrlen >= 16)
 380                 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
 381         if (hdrlen >= 24)
 382                 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
 383         if (hdrlen >= 30)
 384                 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
 385         printk("\n");
 386 }
 387 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
 388 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
 389                                         struct sk_buff *skb)
 390 {
 391 }
 392 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
 393
 394
 395 static int ieee80211_is_eapol(const struct sk_buff *skb)
 396 {
 397         const struct ieee80211_hdr *hdr;
 398         u16 fc;
 399         int hdrlen;
 400
 401         if (unlikely(skb->len < 10))
 402                 return 0;
 403
 404         hdr = (const struct ieee80211_hdr *) skb->data;
 405         fc = le16_to_cpu(hdr->frame_control);
 406
 407         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
 408                 return 0;
 409
 410         hdrlen = ieee80211_get_hdrlen(fc);
 411
 412         if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
 413                      memcmp(skb->data + hdrlen, eapol_header,
 414                             sizeof(eapol_header)) == 0))
 415                 return 1;
 416
 417         return 0;
 418 }
 419
 420
 421 static ieee80211_txrx_result
 422 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
 423 {
 424         struct rate_control_extra extra;
 425
 426         memset(&extra, 0, sizeof(extra));
 427         extra.mode = tx->u.tx.mode;
 428         extra.mgmt_data = tx->sdata &&
 429                 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
 430         extra.ethertype = tx->ethertype;
 431
 432         tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
 433                                               &extra);
 434         if (unlikely(extra.probe != NULL)) {
 435                 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
 436                 tx->u.tx.probe_last_frag = 1;
 437                 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
 438                 tx->u.tx.rate = extra.probe;
 439         } else {
 440                 tx->u.tx.control->alt_retry_rate = -1;
 441         }
 442         if (!tx->u.tx.rate)
 443                 return TXRX_DROP;
 444         if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
 445             tx->sdata->use_protection && tx->fragmented &&
 446             extra.nonerp) {
 447                 tx->u.tx.last_frag_rate = tx->u.tx.rate;
 448                 tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
 449
 450                 tx->u.tx.rate = extra.nonerp;
 451                 tx->u.tx.control->rate = extra.nonerp;
 452                 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
 453         } else {
 454                 tx->u.tx.last_frag_rate = tx->u.tx.rate;
 455                 tx->u.tx.control->rate = tx->u.tx.rate;
 456         }
 457         tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
 458         if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
 459             tx->local->short_preamble &&
 460             (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
 461                 tx->u.tx.short_preamble = 1;
 462                 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
 463         }
 464
 465         return TXRX_CONTINUE;
 466 }
 467
 468
 469 static ieee80211_txrx_result
 470 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
 471 {
 472         if (tx->sta)
 473                 tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
 474         else
 475                 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
 476
 477         if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
 478                 tx->key = NULL;
 479         else if (tx->sta && tx->sta->key)
 480                 tx->key = tx->sta->key;
 481         else if (tx->sdata->default_key)
 482                 tx->key = tx->sdata->default_key;
 483         else if (tx->sdata->drop_unencrypted &&
 484                  !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
 485                 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
 486                 return TXRX_DROP;
 487         } else
 488                 tx->key = NULL;
 489
 490         if (tx->key) {
 491                 tx->key->tx_rx_count++;
 492                 if (unlikely(tx->local->key_tx_rx_threshold &&
 493                              tx->key->tx_rx_count >
 494                              tx->local->key_tx_rx_threshold)) {
 495                         ieee80211_key_threshold_notify(tx->dev, tx->key,
 496                                                        tx->sta);
 497                 }
 498         }
 499
 500         return TXRX_CONTINUE;
 501 }
 502
 503
 504 static ieee80211_txrx_result
 505 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
 506 {
 507         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
 508         size_t hdrlen, per_fragm, num_fragm, payload_len, left;
 509         struct sk_buff **frags, *first, *frag;
 510         int i;
 511         u16 seq;
 512         u8 *pos;
 513         int frag_threshold = tx->local->fragmentation_threshold;
 514
 515         if (!tx->fragmented)
 516                 return TXRX_CONTINUE;
 517
 518         first = tx->skb;
 519
 520         hdrlen = ieee80211_get_hdrlen(tx->fc);
 521         payload_len = first->len - hdrlen;
 522         per_fragm = frag_threshold - hdrlen - FCS_LEN;
 523         num_fragm = (payload_len + per_fragm - 1) / per_fragm;
 524
 525         frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
 526         if (!frags)
 527                 goto fail;
 528
 529         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
 530         seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
 531         pos = first->data + hdrlen + per_fragm;
 532         left = payload_len - per_fragm;
 533         for (i = 0; i < num_fragm - 1; i++) {
 534                 struct ieee80211_hdr *fhdr;
 535                 size_t copylen;
 536
 537                 if (left <= 0)
 538                         goto fail;
 539
 540                 /* reserve enough extra head and tail room for possible
 541                  * encryption */
 542                 frag = frags[i] =
 543                         dev_alloc_skb(tx->local->tx_headroom +
 544                                       frag_threshold +
 545                                       IEEE80211_ENCRYPT_HEADROOM +
 546                                       IEEE80211_ENCRYPT_TAILROOM);
 547                 if (!frag)
 548                         goto fail;
 549                 /* Make sure that all fragments use the same priority so
 550                  * that they end up using the same TX queue */
 551                 frag->priority = first->priority;
 552                 skb_reserve(frag, tx->local->tx_headroom +
 553                                   IEEE80211_ENCRYPT_HEADROOM);
 554                 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
 555                 memcpy(fhdr, first->data, hdrlen);
 556                 if (i == num_fragm - 2)
 557                         fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
 558                 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
 559                 copylen = left > per_fragm ? per_fragm : left;
 560                 memcpy(skb_put(frag, copylen), pos, copylen);
 561
 562                 pos += copylen;
 563                 left -= copylen;
 564         }
 565         skb_trim(first, hdrlen + per_fragm);
 566
 567         tx->u.tx.num_extra_frag = num_fragm - 1;
 568         tx->u.tx.extra_frag = frags;
 569
 570         return TXRX_CONTINUE;
 571
 572  fail:
 573         printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
 574         if (frags) {
 575                 for (i = 0; i < num_fragm - 1; i++)
 576                         if (frags[i])
 577                                 dev_kfree_skb(frags[i]);
 578                 kfree(frags);
 579         }
 580         I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
 581         return TXRX_DROP;
 582 }
 583
 584
 585 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
 586 {
 587         if (tx->key->force_sw_encrypt) {
 588                 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
 589                         return -1;
 590         } else {
 591                 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
 592                 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
 593                         if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
 594                             NULL)
 595                                 return -1;
 596                 }
 597         }
 598         return 0;
 599 }
 600
 601
 602 void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
 603 {
 604         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
 605
 606         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 607         if (tx->u.tx.extra_frag) {
 608                 struct ieee80211_hdr *fhdr;
 609                 int i;
 610                 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
 611                         fhdr = (struct ieee80211_hdr *)
 612                                 tx->u.tx.extra_frag[i]->data;
 613                         fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 614                 }
 615         }
 616 }
 617
 618
 619 static ieee80211_txrx_result
 620 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
 621 {
 622         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
 623         u16 fc;
 624
 625         fc = le16_to_cpu(hdr->frame_control);
 626
 627         if (!tx->key || tx->key->alg != ALG_WEP ||
 628             ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
 629              ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
 630               (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
 631                 return TXRX_CONTINUE;
 632
 633         tx->u.tx.control->iv_len = WEP_IV_LEN;
 634         tx->u.tx.control->icv_len = WEP_ICV_LEN;
 635         ieee80211_tx_set_iswep(tx);
 636
 637         if (wep_encrypt_skb(tx, tx->skb) < 0) {
 638                 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
 639                 return TXRX_DROP;
 640         }
 641
 642         if (tx->u.tx.extra_frag) {
 643                 int i;
 644                 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
 645                         if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
 646                                 I802_DEBUG_INC(tx->local->
 647                                                tx_handlers_drop_wep);
 648                                 return TXRX_DROP;
 649                         }
 650                 }
 651         }
 652
 653         return TXRX_CONTINUE;
 654 }
 655
 656
 657 static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 658                                     int rate, int erp, int short_preamble)
 659 {
 660         int dur;
 661
 662         /* calculate duration (in microseconds, rounded up to next higher
 663          * integer if it includes a fractional microsecond) to send frame of
 664          * len bytes (does not include FCS) at the given rate. Duration will
 665          * also include SIFS.
 666          *
 667          * rate is in 100 kbps, so divident is multiplied by 10 in the
 668          * DIV_ROUND_UP() operations.
 669          */
 670
 671         if (local->hw.conf.phymode == MODE_IEEE80211A || erp ||
 672             local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
 673                 /*
 674                  * OFDM:
 675                  *
 676                  * N_DBPS = DATARATE x 4
 677                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 678                  *      (16 = SIGNAL time, 6 = tail bits)
 679                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 680                  *
 681                  * T_SYM = 4 usec
 682                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
 683                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 684                  *      signal ext = 6 usec
 685                  */
 686                 /* FIX: Atheros Turbo may have different (shorter) duration? */
 687                 dur = 16; /* SIFS + signal ext */
 688                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 689                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 690                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 691                                         4 * rate); /* T_SYM x N_SYM */
 692         } else {
 693                 /*
 694                  * 802.11b or 802.11g with 802.11b compatibility:
 695                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 696                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 697                  *
 698                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 699                  * aSIFSTime = 10 usec
 700                  * aPreambleLength = 144 usec or 72 usec with short preamble
 701                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 702                  */
 703                 dur = 10; /* aSIFSTime = 10 usec */
 704                 dur += short_preamble ? (72 + 24) : (144 + 48);
 705
 706                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 707         }
 708
 709         return dur;
 710 }
 711
 712
 713 /* Exported duration function for driver use */
 714 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 715                                         size_t frame_len, int rate)
 716 {
 717         struct ieee80211_local *local = hw_to_local(hw);
 718         u16 dur;
 719         int erp;
 720
 721         erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
 722         dur = ieee80211_frame_duration(local, frame_len, rate,
 723                                        erp, local->short_preamble);
 724
 725         return cpu_to_le16(dur);
 726 }
 727 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 728
 729
 730 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
 731                               int next_frag_len)
 732 {
 733         int rate, mrate, erp, dur, i;
 734         struct ieee80211_rate *txrate = tx->u.tx.rate;
 735         struct ieee80211_local *local = tx->local;
 736         struct ieee80211_hw_mode *mode = tx->u.tx.mode;
 737
 738         erp = txrate->flags & IEEE80211_RATE_ERP;
 739
 740         /*
 741          * data and mgmt (except PS Poll):
 742          * - during CFP: 32768
 743          * - during contention period:
 744          *   if addr1 is group address: 0
 745          *   if more fragments = 0 and addr1 is individual address: time to
 746          *      transmit one ACK plus SIFS
 747          *   if more fragments = 1 and addr1 is individual address: time to
 748          *      transmit next fragment plus 2 x ACK plus 3 x SIFS
 749          *
 750          * IEEE 802.11, 9.6:
 751          * - control response frame (CTS or ACK) shall be transmitted using the
 752          *   same rate as the immediately previous frame in the frame exchange
 753          *   sequence, if this rate belongs to the PHY mandatory rates, or else
 754          *   at the highest possible rate belonging to the PHY rates in the
 755          *   BSSBasicRateSet
 756          */
 757
 758         if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
 759                 /* TODO: These control frames are not currently sent by
 760                  * 80211.o, but should they be implemented, this function
 761                  * needs to be updated to support duration field calculation.
 762                  *
 763                  * RTS: time needed to transmit pending data/mgmt frame plus
 764                  *    one CTS frame plus one ACK frame plus 3 x SIFS
 765                  * CTS: duration of immediately previous RTS minus time
 766                  *    required to transmit CTS and its SIFS
 767                  * ACK: 0 if immediately previous directed data/mgmt had
 768                  *    more=0, with more=1 duration in ACK frame is duration
 769                  *    from previous frame minus time needed to transmit ACK
 770                  *    and its SIFS
 771                  * PS Poll: BIT(15) | BIT(14) | aid
 772                  */
 773                 return 0;
 774         }
 775
 776         /* data/mgmt */
 777         if (0 /* FIX: data/mgmt during CFP */)
 778                 return 32768;
 779
 780         if (group_addr) /* Group address as the destination - no ACK */
 781                 return 0;
 782
 783         /* Individual destination address:
 784          * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
 785          * CTS and ACK frames shall be transmitted using the highest rate in
 786          * basic rate set that is less than or equal to the rate of the
 787          * immediately previous frame and that is using the same modulation
 788          * (CCK or OFDM). If no basic rate set matches with these requirements,
 789          * the highest mandatory rate of the PHY that is less than or equal to
 790          * the rate of the previous frame is used.
 791          * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
 792          */
 793         rate = -1;
 794         mrate = 10; /* use 1 Mbps if everything fails */
 795         for (i = 0; i < mode->num_rates; i++) {
 796                 struct ieee80211_rate *r = &mode->rates[i];
 797                 if (r->rate > txrate->rate)
 798                         break;
 799
 800                 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
 801                     IEEE80211_RATE_MODULATION(r->flags))
 802                         continue;
 803
 804                 if (r->flags & IEEE80211_RATE_BASIC)
 805                         rate = r->rate;
 806                 else if (r->flags & IEEE80211_RATE_MANDATORY)
 807                         mrate = r->rate;
 808         }
 809         if (rate == -1) {
 810                 /* No matching basic rate found; use highest suitable mandatory
 811                  * PHY rate */
 812                 rate = mrate;
 813         }
 814
 815         /* Time needed to transmit ACK
 816          * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
 817          * to closest integer */
 818
 819         dur = ieee80211_frame_duration(local, 10, rate, erp,
 820                                        local->short_preamble);
 821
 822         if (next_frag_len) {
 823                 /* Frame is fragmented: duration increases with time needed to
 824                  * transmit next fragment plus ACK and 2 x SIFS. */
 825                 dur *= 2; /* ACK + SIFS */
 826                 /* next fragment */
 827                 dur += ieee80211_frame_duration(local, next_frag_len,
 828                                                 txrate->rate, erp,
 829                                                 local->short_preamble);
 830         }
 831
 832         return dur;
 833 }
 834
 835
 836 static ieee80211_txrx_result
 837 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
 838 {
 839         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
 840         u16 dur;
 841         struct ieee80211_tx_control *control = tx->u.tx.control;
 842         struct ieee80211_hw_mode *mode = tx->u.tx.mode;
 843
 844         if (!is_multicast_ether_addr(hdr->addr1)) {
 845                 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
 846                     tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
 847                         control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
 848                         control->retry_limit =
 849                                 tx->local->long_retry_limit;
 850                 } else {
 851                         control->retry_limit =
 852                                 tx->local->short_retry_limit;
 853                 }
 854         } else {
 855                 control->retry_limit = 1;
 856         }
 857
 858         if (tx->fragmented) {
 859                 /* Do not use multiple retry rates when sending fragmented
 860                  * frames.
 861                  * TODO: The last fragment could still use multiple retry
 862                  * rates. */
 863                 control->alt_retry_rate = -1;
 864         }
 865
 866         /* Use CTS protection for unicast frames sent using extended rates if
 867          * there are associated non-ERP stations and RTS/CTS is not configured
 868          * for the frame. */
 869         if (mode->mode == MODE_IEEE80211G &&
 870             (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
 871             tx->u.tx.unicast && tx->sdata->use_protection &&
 872             !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
 873                 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
 874
 875         /* Setup duration field for the first fragment of the frame. Duration
 876          * for remaining fragments will be updated when they are being sent
 877          * to low-level driver in ieee80211_tx(). */
 878         dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
 879                                  tx->fragmented ? tx->u.tx.extra_frag[0]->len :
 880                                  0);
 881         hdr->duration_id = cpu_to_le16(dur);
 882
 883         if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
 884             (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
 885                 struct ieee80211_rate *rate;
 886
 887                 /* Do not use multiple retry rates when using RTS/CTS */
 888                 control->alt_retry_rate = -1;
 889
 890                 /* Use min(data rate, max base rate) as CTS/RTS rate */
 891                 rate = tx->u.tx.rate;
 892                 while (rate > mode->rates &&
 893                        !(rate->flags & IEEE80211_RATE_BASIC))
 894                         rate--;
 895
 896                 control->rts_cts_rate = rate->val;
 897                 control->rts_rate = rate;
 898         }
 899
 900         if (tx->sta) {
 901                 tx->sta->tx_packets++;
 902                 tx->sta->tx_fragments++;
 903                 tx->sta->tx_bytes += tx->skb->len;
 904                 if (tx->u.tx.extra_frag) {
 905                         int i;
 906                         tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
 907                         for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
 908                                 tx->sta->tx_bytes +=
 909                                         tx->u.tx.extra_frag[i]->len;
 910                         }
 911                 }
 912         }
 913
 914         return TXRX_CONTINUE;
 915 }
 916
 917
 918 static ieee80211_txrx_result
 919 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
 920 {
 921 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 922         struct sk_buff *skb = tx->skb;
 923         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 924 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 925         u32 sta_flags;
 926
 927         if (unlikely(tx->local->sta_scanning != 0) &&
 928             ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
 929              (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
 930                 return TXRX_DROP;
 931
 932         if (tx->u.tx.ps_buffered)
 933                 return TXRX_CONTINUE;
 934
 935         sta_flags = tx->sta ? tx->sta->flags : 0;
 936
 937         if (likely(tx->u.tx.unicast)) {
 938                 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
 939                              tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
 940                              (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
 941 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 942                         printk(KERN_DEBUG "%s: dropped data frame to not "
 943                                "associated station " MAC_FMT "\n",
 944                                tx->dev->name, MAC_ARG(hdr->addr1));
 945 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 946                         I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
 947                         return TXRX_DROP;
 948                 }
 949         } else {
 950                 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 951                              tx->local->num_sta == 0 &&
 952                              !tx->local->allow_broadcast_always &&
 953                              tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
 954                         /*
 955                          * No associated STAs - no need to send multicast
 956                          * frames.
 957                          */
 958                         return TXRX_DROP;
 959                 }
 960                 return TXRX_CONTINUE;
 961         }
 962
 963         if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
 964                      !(sta_flags & WLAN_STA_AUTHORIZED))) {
 965 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 966                 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
 967                        " (unauthorized port)\n", tx->dev->name,
 968                        MAC_ARG(hdr->addr1));
 969 #endif
 970                 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
 971                 return TXRX_DROP;
 972         }
 973
 974         return TXRX_CONTINUE;
 975 }
 976
 977 static ieee80211_txrx_result
 978 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
 979 {
 980         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 981
 982         if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
 983                 ieee80211_include_sequence(tx->sdata, hdr);
 984
 985         return TXRX_CONTINUE;
 986 }
 987
 988 /* This function is called whenever the AP is about to exceed the maximum limit
 989  * of buffered frames for power saving STAs. This situation should not really
 990  * happen often during normal operation, so dropping the oldest buffered packet
 991  * from each queue should be OK to make some room for new frames. */
 992 static void purge_old_ps_buffers(struct ieee80211_local *local)
 993 {
 994         int total = 0, purged = 0;
 995         struct sk_buff *skb;
 996         struct ieee80211_sub_if_data *sdata;
 997         struct sta_info *sta;
 998
 999         read_lock(&local->sub_if_lock);
1000         list_for_each_entry(sdata, &local->sub_if_list, list) {
1001                 struct ieee80211_if_ap *ap;
1002                 if (sdata->dev == local->mdev ||
1003                     sdata->type != IEEE80211_IF_TYPE_AP)
1004                         continue;
1005                 ap = &sdata->u.ap;
1006                 skb = skb_dequeue(&ap->ps_bc_buf);
1007                 if (skb) {
1008                         purged++;
1009                         dev_kfree_skb(skb);
1010                 }
1011                 total += skb_queue_len(&ap->ps_bc_buf);
1012         }
1013         read_unlock(&local->sub_if_lock);
1014
1015         spin_lock_bh(&local->sta_lock);
1016         list_for_each_entry(sta, &local->sta_list, list) {
1017                 skb = skb_dequeue(&sta->ps_tx_buf);
1018                 if (skb) {
1019                         purged++;
1020                         dev_kfree_skb(skb);
1021                 }
1022                 total += skb_queue_len(&sta->ps_tx_buf);
1023         }
1024         spin_unlock_bh(&local->sta_lock);
1025
1026         local->total_ps_buffered = total;
1027         printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
1028                local->mdev->name, purged);
1029 }
1030
1031
1032 static inline ieee80211_txrx_result
1033 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
1034 {
1035         /* broadcast/multicast frame */
1036         /* If any of the associated stations is in power save mode,
1037          * the frame is buffered to be sent after DTIM beacon frame */
1038         if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
1039             tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
1040             tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
1041             !(tx->fc & IEEE80211_FCTL_ORDER)) {
1042                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1043                         purge_old_ps_buffers(tx->local);
1044                 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
1045                     AP_MAX_BC_BUFFER) {
1046                         if (net_ratelimit()) {
1047                                 printk(KERN_DEBUG "%s: BC TX buffer full - "
1048                                        "dropping the oldest frame\n",
1049                                        tx->dev->name);
1050                         }
1051                         dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
1052                 } else
1053                         tx->local->total_ps_buffered++;
1054                 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
1055                 return TXRX_QUEUED;
1056         }
1057
1058         return TXRX_CONTINUE;
1059 }
1060
1061
1062 static inline ieee80211_txrx_result
1063 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
1064 {
1065         struct sta_info *sta = tx->sta;
1066
1067         if (unlikely(!sta ||
1068                      ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1069                       (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
1070                 return TXRX_CONTINUE;
1071
1072         if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
1073                 struct ieee80211_tx_packet_data *pkt_data;
1074 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1075                 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
1076                        "before %d)\n",
1077                        MAC_ARG(sta->addr), sta->aid,
1078                        skb_queue_len(&sta->ps_tx_buf));
1079 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1080                 sta->flags |= WLAN_STA_TIM;
1081                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1082                         purge_old_ps_buffers(tx->local);
1083                 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
1084                         struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
1085                         if (net_ratelimit()) {
1086                                 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
1087                                        "buffer full - dropping oldest frame\n",
1088                                        tx->dev->name, MAC_ARG(sta->addr));
1089                         }
1090                         dev_kfree_skb(old);
1091                 } else
1092                         tx->local->total_ps_buffered++;
1093                 /* Queue frame to be sent after STA sends an PS Poll frame */
1094                 if (skb_queue_empty(&sta->ps_tx_buf)) {
1095                         if (tx->local->ops->set_tim)
1096                                 tx->local->ops->set_tim(local_to_hw(tx->local),
1097                                                        sta->aid, 1);
1098                         if (tx->sdata->bss)
1099                                 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
1100                 }
1101                 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
1102                 pkt_data->jiffies = jiffies;
1103                 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
1104                 return TXRX_QUEUED;
1105         }
1106 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1107         else if (unlikely(sta->flags & WLAN_STA_PS)) {
1108                 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
1109                        "set -> send frame\n", tx->dev->name,
1110                        MAC_ARG(sta->addr));
1111         }
1112 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1113         sta->pspoll = 0;
1114
1115         return TXRX_CONTINUE;
1116 }
1117
1118
1119 static ieee80211_txrx_result
1120 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
1121 {
1122         if (unlikely(tx->u.tx.ps_buffered))
1123                 return TXRX_CONTINUE;
1124
1125         if (tx->u.tx.unicast)
1126                 return ieee80211_tx_h_unicast_ps_buf(tx);
1127         else
1128                 return ieee80211_tx_h_multicast_ps_buf(tx);
1129 }
1130
1131
1132 /*
1133  * deal with packet injection down monitor interface
1134  * with Radiotap Header -- only called for monitor mode interface
1135  */
1136
1137 static ieee80211_txrx_result
1138 __ieee80211_parse_tx_radiotap(
1139         struct ieee80211_txrx_data *tx,
1140         struct sk_buff *skb, struct ieee80211_tx_control *control)
1141 {
1142         /*
1143          * this is the moment to interpret and discard the radiotap header that
1144          * must be at the start of the packet injected in Monitor mode
1145          *
1146          * Need to take some care with endian-ness since radiotap
1147          * args are little-endian
1148          */
1149
1150         struct ieee80211_radiotap_iterator iterator;
1151         struct ieee80211_radiotap_header *rthdr =
1152                 (struct ieee80211_radiotap_header *) skb->data;
1153         struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
1154         int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
1155
1156         /*
1157          * default control situation for all injected packets
1158          * FIXME: this does not suit all usage cases, expand to allow control
1159          */
1160
1161         control->retry_limit = 1; /* no retry */
1162         control->key_idx = -1; /* no encryption key */
1163         control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1164                             IEEE80211_TXCTL_USE_CTS_PROTECT);
1165         control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
1166                           IEEE80211_TXCTL_NO_ACK;
1167         control->antenna_sel_tx = 0; /* default to default antenna */
1168
1169         /*
1170          * for every radiotap entry that is present
1171          * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1172          * entries present, or -EINVAL on error)
1173          */
1174
1175         while (!ret) {
1176                 int i, target_rate;
1177
1178                 ret = ieee80211_radiotap_iterator_next(&iterator);
1179
1180                 if (ret)
1181                         continue;
1182
1183                 /* see if this argument is something we can use */
1184                 switch (iterator.this_arg_index) {
1185                 /*
1186                  * You must take care when dereferencing iterator.this_arg
1187                  * for multibyte types... the pointer is not aligned.  Use
1188                  * get_unaligned((type *)iterator.this_arg) to dereference
1189                  * iterator.this_arg for type "type" safely on all arches.
1190                 */
1191                 case IEEE80211_RADIOTAP_RATE:
1192                         /*
1193                          * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
1194                          * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
1195                          */
1196                         target_rate = (*iterator.this_arg) * 5;
1197                         for (i = 0; i < mode->num_rates; i++) {
1198                                 struct ieee80211_rate *r = &mode->rates[i];
1199
1200                                 if (r->rate > target_rate)
1201                                         continue;
1202
1203                                 control->rate = r;
1204
1205                                 if (r->flags & IEEE80211_RATE_PREAMBLE2)
1206                                         control->tx_rate = r->val2;
1207                                 else
1208                                         control->tx_rate = r->val;
1209
1210                                 /* end on exact match */
1211                                 if (r->rate == target_rate)
1212                                         i = mode->num_rates;
1213                         }
1214                         break;
1215
1216                 case IEEE80211_RADIOTAP_ANTENNA:
1217                         /*
1218                          * radiotap uses 0 for 1st ant, mac80211 is 1 for
1219                          * 1st ant
1220                          */
1221                         control->antenna_sel_tx = (*iterator.this_arg) + 1;
1222                         break;
1223
1224                 case IEEE80211_RADIOTAP_DBM_TX_POWER:
1225                         control->power_level = *iterator.this_arg;
1226                         break;
1227
1228                 case IEEE80211_RADIOTAP_FLAGS:
1229                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1230                                 /*
1231                                  * this indicates that the skb we have been
1232                                  * handed has the 32-bit FCS CRC at the end...
1233                                  * we should react to that by snipping it off
1234                                  * because it will be recomputed and added
1235                                  * on transmission
1236                                  */
1237                                 if (skb->len < (iterator.max_length + FCS_LEN))
1238                                         return TXRX_DROP;
1239
1240                                 skb_trim(skb, skb->len - FCS_LEN);
1241                         }
1242                         break;
1243
1244                 default:
1245                         break;
1246                 }
1247         }
1248
1249         if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1250                 return TXRX_DROP;
1251
1252         /*
1253          * remove the radiotap header
1254          * iterator->max_length was sanity-checked against
1255          * skb->len by iterator init
1256          */
1257         skb_pull(skb, iterator.max_length);
1258
1259         return TXRX_CONTINUE;
1260 }
1261
1262
1263 static ieee80211_txrx_result inline
1264 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1265                        struct sk_buff *skb,
1266                        struct net_device *dev,
1267                        struct ieee80211_tx_control *control)
1268 {
1269         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1270         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1271         struct ieee80211_sub_if_data *sdata;
1272         ieee80211_txrx_result res = TXRX_CONTINUE;
1273
1274         int hdrlen;
1275
1276         memset(tx, 0, sizeof(*tx));
1277         tx->skb = skb;
1278         tx->dev = dev; /* use original interface */
1279         tx->local = local;
1280         tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1281         tx->sta = sta_info_get(local, hdr->addr1);
1282         tx->fc = le16_to_cpu(hdr->frame_control);
1283
1284         /*
1285          * set defaults for things that can be set by
1286          * injected radiotap headers
1287          */
1288         control->power_level = local->hw.conf.power_level;
1289         control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1290         if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
1291                 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
1292
1293         /* process and remove the injection radiotap header */
1294         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1295         if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
1296                 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
1297                                                                 TXRX_DROP) {
1298                         return TXRX_DROP;
1299                 }
1300                 /*
1301                  * we removed the radiotap header after this point,
1302                  * we filled control with what we could use
1303                  * set to the actual ieee header now
1304                  */
1305                 hdr = (struct ieee80211_hdr *) skb->data;
1306                 res = TXRX_QUEUED; /* indication it was monitor packet */
1307         }
1308
1309         tx->u.tx.control = control;
1310         tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
1311         if (is_multicast_ether_addr(hdr->addr1))
1312                 control->flags |= IEEE80211_TXCTL_NO_ACK;
1313         else
1314                 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1315         tx->fragmented = local->fragmentation_threshold <
1316                 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
1317                 skb->len + FCS_LEN > local->fragmentation_threshold &&
1318                 (!local->ops->set_frag_threshold);
1319         if (!tx->sta)
1320                 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1321         else if (tx->sta->clear_dst_mask) {
1322                 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1323                 tx->sta->clear_dst_mask = 0;
1324         }
1325         hdrlen = ieee80211_get_hdrlen(tx->fc);
1326         if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1327                 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1328                 tx->ethertype = (pos[0] << 8) | pos[1];
1329         }
1330         control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1331
1332         return res;
1333 }
1334
1335 static int inline is_ieee80211_device(struct net_device *dev,
1336                                       struct net_device *master)
1337 {
1338         return (wdev_priv(dev->ieee80211_ptr) ==
1339                 wdev_priv(master->ieee80211_ptr));
1340 }
1341
1342 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1343  * finished with it. */
1344 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1345                                        struct sk_buff *skb,
1346                                        struct net_device *mdev,
1347                                        struct ieee80211_tx_control *control)
1348 {
1349         struct ieee80211_tx_packet_data *pkt_data;
1350         struct net_device *dev;
1351
1352         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1353         dev = dev_get_by_index(pkt_data->ifindex);
1354         if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1355                 dev_put(dev);
1356                 dev = NULL;
1357         }
1358         if (unlikely(!dev))
1359                 return -ENODEV;
1360         __ieee80211_tx_prepare(tx, skb, dev, control);
1361         return 0;
1362 }
1363
1364 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
1365                                             int queue)
1366 {
1367         return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
1368 }
1369
1370 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
1371                                             int queue)
1372 {
1373         return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
1374 }
1375
1376 #define IEEE80211_TX_OK         0
1377 #define IEEE80211_TX_AGAIN      1
1378 #define IEEE80211_TX_FRAG_AGAIN 2
1379
1380 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1381                           struct ieee80211_txrx_data *tx)
1382 {
1383         struct ieee80211_tx_control *control = tx->u.tx.control;
1384         int ret, i;
1385
1386         if (!ieee80211_qdisc_installed(local->mdev) &&
1387             __ieee80211_queue_stopped(local, 0)) {
1388                 netif_stop_queue(local->mdev);
1389                 return IEEE80211_TX_AGAIN;
1390         }
1391         if (skb) {
1392                 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1393                 ret = local->ops->tx(local_to_hw(local), skb, control);
1394                 if (ret)
1395                         return IEEE80211_TX_AGAIN;
1396                 local->mdev->trans_start = jiffies;
1397                 ieee80211_led_tx(local, 1);
1398         }
1399         if (tx->u.tx.extra_frag) {
1400                 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1401                                     IEEE80211_TXCTL_USE_CTS_PROTECT |
1402                                     IEEE80211_TXCTL_CLEAR_DST_MASK |
1403                                     IEEE80211_TXCTL_FIRST_FRAGMENT);
1404                 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1405                         if (!tx->u.tx.extra_frag[i])
1406                                 continue;
1407                         if (__ieee80211_queue_stopped(local, control->queue))
1408                                 return IEEE80211_TX_FRAG_AGAIN;
1409                         if (i == tx->u.tx.num_extra_frag) {
1410                                 control->tx_rate = tx->u.tx.last_frag_hwrate;
1411                                 control->rate = tx->u.tx.last_frag_rate;
1412                                 if (tx->u.tx.probe_last_frag)
1413                                         control->flags |=
1414                                                 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1415                                 else
1416                                         control->flags &=
1417                                                 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1418                         }
1419
1420                         ieee80211_dump_frame(local->mdev->name,
1421                                              "TX to low-level driver",
1422                                              tx->u.tx.extra_frag[i]);
1423                         ret = local->ops->tx(local_to_hw(local),
1424                                             tx->u.tx.extra_frag[i],
1425                                             control);
1426                         if (ret)
1427                                 return IEEE80211_TX_FRAG_AGAIN;
1428                         local->mdev->trans_start = jiffies;
1429                         ieee80211_led_tx(local, 1);
1430                         tx->u.tx.extra_frag[i] = NULL;
1431                 }
1432                 kfree(tx->u.tx.extra_frag);
1433                 tx->u.tx.extra_frag = NULL;
1434         }
1435         return IEEE80211_TX_OK;
1436 }
1437
1438 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1439                         struct ieee80211_tx_control *control, int mgmt)
1440 {
1441         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1442         struct sta_info *sta;
1443         ieee80211_tx_handler *handler;
1444         struct ieee80211_txrx_data tx;
1445         ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1446         int ret, i;
1447
1448         WARN_ON(__ieee80211_queue_pending(local, control->queue));
1449
1450         if (unlikely(skb->len < 10)) {
1451                 dev_kfree_skb(skb);
1452                 return 0;
1453         }
1454
1455         res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1456
1457         if (res_prepare == TXRX_DROP) {
1458                 dev_kfree_skb(skb);
1459                 return 0;
1460         }
1461
1462         sta = tx.sta;
1463         tx.u.tx.mgmt_interface = mgmt;
1464         tx.u.tx.mode = local->hw.conf.mode;
1465
1466         if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1467                 res = TXRX_CONTINUE;
1468         } else {
1469                 for (handler = local->tx_handlers; *handler != NULL;
1470                      handler++) {
1471                         res = (*handler)(&tx);
1472                         if (res != TXRX_CONTINUE)
1473                                 break;
1474                 }
1475         }
1476
1477         skb = tx.skb; /* handlers are allowed to change skb */
1478
1479         if (sta)
1480                 sta_info_put(sta);
1481
1482         if (unlikely(res == TXRX_DROP)) {
1483                 I802_DEBUG_INC(local->tx_handlers_drop);
1484                 goto drop;
1485         }
1486
1487         if (unlikely(res == TXRX_QUEUED)) {
1488                 I802_DEBUG_INC(local->tx_handlers_queued);
1489                 return 0;
1490         }
1491
1492         if (tx.u.tx.extra_frag) {
1493                 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1494                         int next_len, dur;
1495                         struct ieee80211_hdr *hdr =
1496                                 (struct ieee80211_hdr *)
1497                                 tx.u.tx.extra_frag[i]->data;
1498
1499                         if (i + 1 < tx.u.tx.num_extra_frag) {
1500                                 next_len = tx.u.tx.extra_frag[i + 1]->len;
1501                         } else {
1502                                 next_len = 0;
1503                                 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1504                                 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1505                         }
1506                         dur = ieee80211_duration(&tx, 0, next_len);
1507                         hdr->duration_id = cpu_to_le16(dur);
1508                 }
1509         }
1510
1511 retry:
1512         ret = __ieee80211_tx(local, skb, &tx);
1513         if (ret) {
1514                 struct ieee80211_tx_stored_packet *store =
1515                         &local->pending_packet[control->queue];
1516
1517                 if (ret == IEEE80211_TX_FRAG_AGAIN)
1518                         skb = NULL;
1519                 set_bit(IEEE80211_LINK_STATE_PENDING,
1520                         &local->state[control->queue]);
1521                 smp_mb();
1522                 /* When the driver gets out of buffers during sending of
1523                  * fragments and calls ieee80211_stop_queue, there is
1524                  * a small window between IEEE80211_LINK_STATE_XOFF and
1525                  * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1526                  * gets available in that window (i.e. driver calls
1527                  * ieee80211_wake_queue), we would end up with ieee80211_tx
1528                  * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1529                  * continuing transmitting here when that situation is
1530                  * possible to have happened. */
1531                 if (!__ieee80211_queue_stopped(local, control->queue)) {
1532                         clear_bit(IEEE80211_LINK_STATE_PENDING,
1533                                   &local->state[control->queue]);
1534                         goto retry;
1535                 }
1536                 memcpy(&store->control, control,
1537                        sizeof(struct ieee80211_tx_control));
1538                 store->skb = skb;
1539                 store->extra_frag = tx.u.tx.extra_frag;
1540                 store->num_extra_frag = tx.u.tx.num_extra_frag;
1541                 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1542                 store->last_frag_rate = tx.u.tx.last_frag_rate;
1543                 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1544         }
1545         return 0;
1546
1547  drop:
1548         if (skb)
1549                 dev_kfree_skb(skb);
1550         for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1551                 if (tx.u.tx.extra_frag[i])
1552                         dev_kfree_skb(tx.u.tx.extra_frag[i]);
1553         kfree(tx.u.tx.extra_frag);
1554         return 0;
1555 }
1556
1557 static void ieee80211_tx_pending(unsigned long data)
1558 {
1559         struct ieee80211_local *local = (struct ieee80211_local *)data;
1560         struct net_device *dev = local->mdev;
1561         struct ieee80211_tx_stored_packet *store;
1562         struct ieee80211_txrx_data tx;
1563         int i, ret, reschedule = 0;
1564
1565         netif_tx_lock_bh(dev);
1566         for (i = 0; i < local->hw.queues; i++) {
1567                 if (__ieee80211_queue_stopped(local, i))
1568                         continue;
1569                 if (!__ieee80211_queue_pending(local, i)) {
1570                         reschedule = 1;
1571                         continue;
1572                 }
1573                 store = &local->pending_packet[i];
1574                 tx.u.tx.control = &store->control;
1575                 tx.u.tx.extra_frag = store->extra_frag;
1576                 tx.u.tx.num_extra_frag = store->num_extra_frag;
1577                 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1578                 tx.u.tx.last_frag_rate = store->last_frag_rate;
1579                 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1580                 ret = __ieee80211_tx(local, store->skb, &tx);
1581                 if (ret) {
1582                         if (ret == IEEE80211_TX_FRAG_AGAIN)
1583                                 store->skb = NULL;
1584                 } else {
1585                         clear_bit(IEEE80211_LINK_STATE_PENDING,
1586                                   &local->state[i]);
1587                         reschedule = 1;
1588                 }
1589         }
1590         netif_tx_unlock_bh(dev);
1591         if (reschedule) {
1592                 if (!ieee80211_qdisc_installed(dev)) {
1593                         if (!__ieee80211_queue_stopped(local, 0))
1594                                 netif_wake_queue(dev);
1595                 } else
1596                         netif_schedule(dev);
1597         }
1598 }
1599
1600 static void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1601 {
1602         int i, j;
1603         struct ieee80211_tx_stored_packet *store;
1604
1605         for (i = 0; i < local->hw.queues; i++) {
1606                 if (!__ieee80211_queue_pending(local, i))
1607                         continue;
1608                 store = &local->pending_packet[i];
1609                 kfree_skb(store->skb);
1610                 for (j = 0; j < store->num_extra_frag; j++)
1611                         kfree_skb(store->extra_frag[j]);
1612                 kfree(store->extra_frag);
1613                 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1614         }
1615 }
1616
1617 static int ieee80211_master_start_xmit(struct sk_buff *skb,
1618                                        struct net_device *dev)
1619 {
1620         struct ieee80211_tx_control control;
1621         struct ieee80211_tx_packet_data *pkt_data;
1622         struct net_device *odev = NULL;
1623         struct ieee80211_sub_if_data *osdata;
1624         int headroom;
1625         int ret;
1626
1627         /*
1628          * copy control out of the skb so other people can use skb->cb
1629          */
1630         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1631         memset(&control, 0, sizeof(struct ieee80211_tx_control));
1632
1633         if (pkt_data->ifindex)
1634                 odev = dev_get_by_index(pkt_data->ifindex);
1635         if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1636                 dev_put(odev);
1637                 odev = NULL;
1638         }
1639         if (unlikely(!odev)) {
1640 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1641                 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1642                        "originating device\n", dev->name);
1643 #endif
1644                 dev_kfree_skb(skb);
1645                 return 0;
1646         }
1647         osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1648
1649         headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1650         if (skb_headroom(skb) < headroom) {
1651                 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1652                         dev_kfree_skb(skb);
1653                         dev_put(odev);
1654                         return 0;
1655                 }
1656         }
1657
1658         control.ifindex = odev->ifindex;
1659         control.type = osdata->type;
1660         if (pkt_data->req_tx_status)
1661                 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1662         if (pkt_data->do_not_encrypt)
1663                 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1664         if (pkt_data->requeue)
1665                 control.flags |= IEEE80211_TXCTL_REQUEUE;
1666         control.queue = pkt_data->queue;
1667
1668         ret = ieee80211_tx(odev, skb, &control,
1669                            control.type == IEEE80211_IF_TYPE_MGMT);
1670         dev_put(odev);
1671
1672         return ret;
1673 }
1674
1675
1676 int ieee80211_monitor_start_xmit(struct sk_buff *skb,
1677                                  struct net_device *dev)
1678 {
1679         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1680         struct ieee80211_tx_packet_data *pkt_data;
1681         struct ieee80211_radiotap_header *prthdr =
1682                 (struct ieee80211_radiotap_header *)skb->data;
1683         u16 len;
1684
1685         /*
1686          * there must be a radiotap header at the
1687          * start in this case
1688          */
1689         if (unlikely(prthdr->it_version)) {
1690                 /* only version 0 is supported */
1691                 dev_kfree_skb(skb);
1692                 return NETDEV_TX_OK;
1693         }
1694
1695         skb->dev = local->mdev;
1696
1697         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1698         memset(pkt_data, 0, sizeof(*pkt_data));
1699         pkt_data->ifindex = dev->ifindex;
1700         pkt_data->mgmt_iface = 0;
1701         pkt_data->do_not_encrypt = 1;
1702
1703         /* above needed because we set skb device to master */
1704
1705         /*
1706          * fix up the pointers accounting for the radiotap
1707          * header still being in there.  We are being given
1708          * a precooked IEEE80211 header so no need for
1709          * normal processing
1710          */
1711         len = le16_to_cpu(get_unaligned(&prthdr->it_len));
1712         skb_set_mac_header(skb, len);
1713         skb_set_network_header(skb, len + sizeof(struct ieee80211_hdr));
1714         skb_set_transport_header(skb, len + sizeof(struct ieee80211_hdr));
1715
1716         /*
1717          * pass the radiotap header up to
1718          * the next stage intact
1719          */
1720         dev_queue_xmit(skb);
1721
1722         return NETDEV_TX_OK;
1723 }
1724
1725
1726 /**
1727  * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1728  * subinterfaces (wlan#, WDS, and VLAN interfaces)
1729  * @skb: packet to be sent
1730  * @dev: incoming interface
1731  *
1732  * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1733  * not be freed, and caller is responsible for either retrying later or freeing
1734  * skb).
1735  *
1736  * This function takes in an Ethernet header and encapsulates it with suitable
1737  * IEEE 802.11 header based on which interface the packet is coming in. The
1738  * encapsulated packet will then be passed to master interface, wlan#.11, for
1739  * transmission (through low-level driver).
1740  */
1741 int ieee80211_subif_start_xmit(struct sk_buff *skb,
1742                                struct net_device *dev)
1743 {
1744         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1745         struct ieee80211_tx_packet_data *pkt_data;
1746         struct ieee80211_sub_if_data *sdata;
1747         int ret = 1, head_need;
1748         u16 ethertype, hdrlen, fc;
1749         struct ieee80211_hdr hdr;
1750         const u8 *encaps_data;
1751         int encaps_len, skip_header_bytes;
1752         int nh_pos, h_pos, no_encrypt = 0;
1753         struct sta_info *sta;
1754
1755         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1756         if (unlikely(skb->len < ETH_HLEN)) {
1757                 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1758                        dev->name, skb->len);
1759                 ret = 0;
1760                 goto fail;
1761         }
1762
1763         nh_pos = skb_network_header(skb) - skb->data;
1764         h_pos = skb_transport_header(skb) - skb->data;
1765
1766         /* convert Ethernet header to proper 802.11 header (based on
1767          * operation mode) */
1768         ethertype = (skb->data[12] << 8) | skb->data[13];
1769         /* TODO: handling for 802.1x authorized/unauthorized port */
1770         fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1771
1772         if (likely(sdata->type == IEEE80211_IF_TYPE_AP ||
1773                    sdata->type == IEEE80211_IF_TYPE_VLAN)) {
1774                 fc |= IEEE80211_FCTL_FROMDS;
1775                 /* DA BSSID SA */
1776                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1777                 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1778                 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1779                 hdrlen = 24;
1780         } else if (sdata->type == IEEE80211_IF_TYPE_WDS) {
1781                 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1782                 /* RA TA DA SA */
1783                 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1784                 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1785                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1786                 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1787                 hdrlen = 30;
1788         } else if (sdata->type == IEEE80211_IF_TYPE_STA) {
1789                 fc |= IEEE80211_FCTL_TODS;
1790                 /* BSSID SA DA */
1791                 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1792                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1793                 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1794                 hdrlen = 24;
1795         } else if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
1796                 /* DA SA BSSID */
1797                 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1798                 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1799                 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1800                 hdrlen = 24;
1801         } else {
1802                 ret = 0;
1803                 goto fail;
1804         }
1805
1806         /* receiver is QoS enabled, use a QoS type frame */
1807         sta = sta_info_get(local, hdr.addr1);
1808         if (sta) {
1809                 if (sta->flags & WLAN_STA_WME) {
1810                         fc |= IEEE80211_STYPE_QOS_DATA;
1811                         hdrlen += 2;
1812                 }
1813                 sta_info_put(sta);
1814         }
1815
1816         hdr.frame_control = cpu_to_le16(fc);
1817         hdr.duration_id = 0;
1818         hdr.seq_ctrl = 0;
1819
1820         skip_header_bytes = ETH_HLEN;
1821         if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1822                 encaps_data = bridge_tunnel_header;
1823                 encaps_len = sizeof(bridge_tunnel_header);
1824                 skip_header_bytes -= 2;
1825         } else if (ethertype >= 0x600) {
1826                 encaps_data = rfc1042_header;
1827                 encaps_len = sizeof(rfc1042_header);
1828                 skip_header_bytes -= 2;
1829         } else {
1830                 encaps_data = NULL;
1831                 encaps_len = 0;
1832         }
1833
1834         skb_pull(skb, skip_header_bytes);
1835         nh_pos -= skip_header_bytes;
1836         h_pos -= skip_header_bytes;
1837
1838         /* TODO: implement support for fragments so that there is no need to
1839          * reallocate and copy payload; it might be enough to support one
1840          * extra fragment that would be copied in the beginning of the frame
1841          * data.. anyway, it would be nice to include this into skb structure
1842          * somehow
1843          *
1844          * There are few options for this:
1845          * use skb->cb as an extra space for 802.11 header
1846          * allocate new buffer if not enough headroom
1847          * make sure that there is enough headroom in every skb by increasing
1848          * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1849          * alloc_skb() (net/core/skbuff.c)
1850          */
1851         head_need = hdrlen + encaps_len + local->tx_headroom;
1852         head_need -= skb_headroom(skb);
1853
1854         /* We are going to modify skb data, so make a copy of it if happens to
1855          * be cloned. This could happen, e.g., with Linux bridge code passing
1856          * us broadcast frames. */
1857
1858         if (head_need > 0 || skb_cloned(skb)) {
1859 #if 0
1860                 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1861                        "of headroom\n", dev->name, head_need);
1862 #endif
1863
1864                 if (skb_cloned(skb))
1865                         I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1866                 else
1867                         I802_DEBUG_INC(local->tx_expand_skb_head);
1868                 /* Since we have to reallocate the buffer, make sure that there
1869                  * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1870                  * before payload and 12 after). */
1871                 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1872                                      12, GFP_ATOMIC)) {
1873                         printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1874                                "\n", dev->name);
1875                         goto fail;
1876                 }
1877         }
1878
1879         if (encaps_data) {
1880                 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1881                 nh_pos += encaps_len;
1882                 h_pos += encaps_len;
1883         }
1884         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1885         nh_pos += hdrlen;
1886         h_pos += hdrlen;
1887
1888         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1889         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1890         pkt_data->ifindex = dev->ifindex;
1891         pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1892         pkt_data->do_not_encrypt = no_encrypt;
1893
1894         skb->dev = local->mdev;
1895         sdata->stats.tx_packets++;
1896         sdata->stats.tx_bytes += skb->len;
1897
1898         /* Update skb pointers to various headers since this modified frame
1899          * is going to go through Linux networking code that may potentially
1900          * need things like pointer to IP header. */
1901         skb_set_mac_header(skb, 0);
1902         skb_set_network_header(skb, nh_pos);
1903         skb_set_transport_header(skb, h_pos);
1904
1905         dev->trans_start = jiffies;
1906         dev_queue_xmit(skb);
1907
1908         return 0;
1909
1910  fail:
1911         if (!ret)
1912                 dev_kfree_skb(skb);
1913
1914         return ret;
1915 }
1916
1917
1918 /*
1919  * This is the transmit routine for the 802.11 type interfaces
1920  * called by upper layers of the linux networking
1921  * stack when it has a frame to transmit
1922  */
1923 static int
1924 ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1925 {
1926         struct ieee80211_sub_if_data *sdata;
1927         struct ieee80211_tx_packet_data *pkt_data;
1928         struct ieee80211_hdr *hdr;
1929         u16 fc;
1930
1931         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1932
1933         if (skb->len < 10) {
1934                 dev_kfree_skb(skb);
1935                 return 0;
1936         }
1937
1938         if (skb_headroom(skb) < sdata->local->tx_headroom) {
1939                 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1940                                      0, GFP_ATOMIC)) {
1941                         dev_kfree_skb(skb);
1942                         return 0;
1943                 }
1944         }
1945
1946         hdr = (struct ieee80211_hdr *) skb->data;
1947         fc = le16_to_cpu(hdr->frame_control);
1948
1949         pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1950         memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1951         pkt_data->ifindex = sdata->dev->ifindex;
1952         pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1953
1954         skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1955         skb->dev = sdata->local->mdev;
1956
1957         /*
1958          * We're using the protocol field of the the frame control header
1959          * to request TX callback for hostapd. BIT(1) is checked.
1960          */
1961         if ((fc & BIT(1)) == BIT(1)) {
1962                 pkt_data->req_tx_status = 1;
1963                 fc &= ~BIT(1);
1964                 hdr->frame_control = cpu_to_le16(fc);
1965         }
1966
1967         pkt_data->do_not_encrypt = !(fc & IEEE80211_FCTL_PROTECTED);
1968
1969         sdata->stats.tx_packets++;
1970         sdata->stats.tx_bytes += skb->len;
1971
1972         dev_queue_xmit(skb);
1973
1974         return 0;
1975 }
1976
1977
1978 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1979                                      struct ieee80211_if_ap *bss,
1980                                      struct sk_buff *skb)
1981 {
1982         u8 *pos, *tim;
1983         int aid0 = 0;
1984         int i, have_bits = 0, n1, n2;
1985
1986         /* Generate bitmap for TIM only if there are any STAs in power save
1987          * mode. */
1988         spin_lock_bh(&local->sta_lock);
1989         if (atomic_read(&bss->num_sta_ps) > 0)
1990                 /* in the hope that this is faster than
1991                  * checking byte-for-byte */
1992                 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1993                                           IEEE80211_MAX_AID+1);
1994
1995         if (bss->dtim_count == 0)
1996                 bss->dtim_count = bss->dtim_period - 1;
1997         else
1998                 bss->dtim_count--;
1999
2000         tim = pos = (u8 *) skb_put(skb, 6);
2001         *pos++ = WLAN_EID_TIM;
2002         *pos++ = 4;
2003         *pos++ = bss->dtim_count;
2004         *pos++ = bss->dtim_period;
2005
2006         if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2007                 aid0 = 1;
2008
2009         if (have_bits) {
2010                 /* Find largest even number N1 so that bits numbered 1 through
2011                  * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2012                  * (N2 + 1) x 8 through 2007 are 0. */
2013                 n1 = 0;
2014                 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2015                         if (bss->tim[i]) {
2016                                 n1 = i & 0xfe;
2017                                 break;
2018                         }
2019                 }
2020                 n2 = n1;
2021                 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2022                         if (bss->tim[i]) {
2023                                 n2 = i;
2024                                 break;
2025                         }
2026                 }
2027
2028                 /* Bitmap control */
2029                 *pos++ = n1 | aid0;
2030                 /* Part Virt Bitmap */
2031                 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2032
2033                 tim[1] = n2 - n1 + 4;
2034                 skb_put(skb, n2 - n1);
2035         } else {
2036                 *pos++ = aid0; /* Bitmap control */
2037                 *pos++ = 0; /* Part Virt Bitmap */
2038         }
2039         spin_unlock_bh(&local->sta_lock);
2040 }
2041
2042
2043 struct sk_buff * ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
2044                                       struct ieee80211_tx_control *control)
2045 {
2046         struct ieee80211_local *local = hw_to_local(hw);
2047         struct sk_buff *skb;
2048         struct net_device *bdev;
2049         struct ieee80211_sub_if_data *sdata = NULL;
2050         struct ieee80211_if_ap *ap = NULL;
2051         struct ieee80211_rate *rate;
2052         struct rate_control_extra extra;
2053         u8 *b_head, *b_tail;
2054         int bh_len, bt_len;
2055
2056         bdev = dev_get_by_index(if_id);
2057         if (bdev) {
2058                 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
2059                 ap = &sdata->u.ap;
2060                 dev_put(bdev);
2061         }
2062
2063         if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
2064             !ap->beacon_head) {
2065 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2066                 if (net_ratelimit())
2067                         printk(KERN_DEBUG "no beacon data avail for idx=%d "
2068                                "(%s)\n", if_id, bdev ? bdev->name : "N/A");
2069 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2070                 return NULL;
2071         }
2072
2073         /* Assume we are generating the normal beacon locally */
2074         b_head = ap->beacon_head;
2075         b_tail = ap->beacon_tail;
2076         bh_len = ap->beacon_head_len;
2077         bt_len = ap->beacon_tail_len;
2078
2079         skb = dev_alloc_skb(local->tx_headroom +
2080                 bh_len + bt_len + 256 /* maximum TIM len */);
2081         if (!skb)
2082                 return NULL;
2083
2084         skb_reserve(skb, local->tx_headroom);
2085         memcpy(skb_put(skb, bh_len), b_head, bh_len);
2086
2087         ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
2088
2089         ieee80211_beacon_add_tim(local, ap, skb);
2090
2091         if (b_tail) {
2092                 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
2093         }
2094
2095         if (control) {
2096                 memset(&extra, 0, sizeof(extra));
2097                 extra.mode = local->oper_hw_mode;
2098
2099                 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
2100                 if (!rate) {
2101                         if (net_ratelimit()) {
2102                                 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
2103                                        "found\n", local->mdev->name);
2104                         }
2105                         dev_kfree_skb(skb);
2106                         return NULL;
2107                 }
2108
2109                 control->tx_rate = (local->short_preamble &&
2110                                     (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2111                         rate->val2 : rate->val;
2112                 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2113                 control->power_level = local->hw.conf.power_level;
2114                 control->flags |= IEEE80211_TXCTL_NO_ACK;
2115                 control->retry_limit = 1;
2116                 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
2117         }
2118
2119         ap->num_beacons++;
2120         return skb;
2121 }
2122 EXPORT_SYMBOL(ieee80211_beacon_get);
2123
2124 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
2125                               size_t frame_len,
2126                               const struct ieee80211_tx_control *frame_txctl)
2127 {
2128         struct ieee80211_local *local = hw_to_local(hw);
2129         struct ieee80211_rate *rate;
2130         int short_preamble = local->short_preamble;
2131         int erp;
2132         u16 dur;
2133
2134         rate = frame_txctl->rts_rate;
2135         erp = !!(rate->flags & IEEE80211_RATE_ERP);
2136
2137         /* CTS duration */
2138         dur = ieee80211_frame_duration(local, 10, rate->rate,
2139                                        erp, short_preamble);
2140         /* Data frame duration */
2141         dur += ieee80211_frame_duration(local, frame_len, rate->rate,
2142                                         erp, short_preamble);
2143         /* ACK duration */
2144         dur += ieee80211_frame_duration(local, 10, rate->rate,
2145                                         erp, short_preamble);
2146
2147         return cpu_to_le16(dur);
2148 }
2149 EXPORT_SYMBOL(ieee80211_rts_duration);
2150
2151
2152 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
2153                                     size_t frame_len,
2154                                     const struct ieee80211_tx_control *frame_txctl)
2155 {
2156         struct ieee80211_local *local = hw_to_local(hw);
2157         struct ieee80211_rate *rate;
2158         int short_preamble = local->short_preamble;
2159         int erp;
2160         u16 dur;
2161
2162         rate = frame_txctl->rts_rate;
2163         erp = !!(rate->flags & IEEE80211_RATE_ERP);
2164
2165         /* Data frame duration */
2166         dur = ieee80211_frame_duration(local, frame_len, rate->rate,
2167                                        erp, short_preamble);
2168         if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
2169                 /* ACK duration */
2170                 dur += ieee80211_frame_duration(local, 10, rate->rate,
2171                                                 erp, short_preamble);
2172         }
2173
2174         return cpu_to_le16(dur);
2175 }
2176 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
2177
2178 void ieee80211_rts_get(struct ieee80211_hw *hw,
2179                        const void *frame, size_t frame_len,
2180                        const struct ieee80211_tx_control *frame_txctl,
2181                        struct ieee80211_rts *rts)
2182 {
2183         const struct ieee80211_hdr *hdr = frame;
2184         u16 fctl;
2185
2186         fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
2187         rts->frame_control = cpu_to_le16(fctl);
2188         rts->duration = ieee80211_rts_duration(hw, frame_len, frame_txctl);
2189         memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2190         memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2191 }
2192 EXPORT_SYMBOL(ieee80211_rts_get);
2193
2194 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
2195                              const void *frame, size_t frame_len,
2196                              const struct ieee80211_tx_control *frame_txctl,
2197                              struct ieee80211_cts *cts)
2198 {
2199         const struct ieee80211_hdr *hdr = frame;
2200         u16 fctl;
2201
2202         fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
2203         cts->frame_control = cpu_to_le16(fctl);
2204         cts->duration = ieee80211_ctstoself_duration(hw, frame_len, frame_txctl);
2205         memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2206 }
2207 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2208
2209 struct sk_buff *
2210 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
2211                           struct ieee80211_tx_control *control)
2212 {
2213         struct ieee80211_local *local = hw_to_local(hw);
2214         struct sk_buff *skb;
2215         struct sta_info *sta;
2216         ieee80211_tx_handler *handler;
2217         struct ieee80211_txrx_data tx;
2218         ieee80211_txrx_result res = TXRX_DROP;
2219         struct net_device *bdev;
2220         struct ieee80211_sub_if_data *sdata;
2221         struct ieee80211_if_ap *bss = NULL;
2222
2223         bdev = dev_get_by_index(if_id);
2224         if (bdev) {
2225                 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
2226                 bss = &sdata->u.ap;
2227                 dev_put(bdev);
2228         }
2229         if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
2230                 return NULL;
2231
2232         if (bss->dtim_count != 0)
2233                 return NULL; /* send buffered bc/mc only after DTIM beacon */
2234         memset(control, 0, sizeof(*control));
2235         while (1) {
2236                 skb = skb_dequeue(&bss->ps_bc_buf);
2237                 if (!skb)
2238                         return NULL;
2239                 local->total_ps_buffered--;
2240
2241                 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2242                         struct ieee80211_hdr *hdr =
2243                                 (struct ieee80211_hdr *) skb->data;
2244                         /* more buffered multicast/broadcast frames ==> set
2245                          * MoreData flag in IEEE 802.11 header to inform PS
2246                          * STAs */
2247                         hdr->frame_control |=
2248                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2249                 }
2250
2251                 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
2252                         break;
2253                 dev_kfree_skb_any(skb);
2254         }
2255         sta = tx.sta;
2256         tx.u.tx.ps_buffered = 1;
2257
2258         for (handler = local->tx_handlers; *handler != NULL; handler++) {
2259                 res = (*handler)(&tx);
2260                 if (res == TXRX_DROP || res == TXRX_QUEUED)
2261                         break;
2262         }
2263         dev_put(tx.dev);
2264         skb = tx.skb; /* handlers are allowed to change skb */
2265
2266         if (res == TXRX_DROP) {
2267                 I802_DEBUG_INC(local->tx_handlers_drop);
2268                 dev_kfree_skb(skb);
2269                 skb = NULL;
2270         } else if (res == TXRX_QUEUED) {
2271                 I802_DEBUG_INC(local->tx_handlers_queued);
2272                 skb = NULL;
2273         }
2274
2275         if (sta)
2276                 sta_info_put(sta);
2277
2278         return skb;
2279 }
2280 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2281
2282 static int __ieee80211_if_config(struct net_device *dev,
2283                                  struct sk_buff *beacon,
2284                                  struct ieee80211_tx_control *control)
2285 {
2286         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2287         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2288         struct ieee80211_if_conf conf;
2289         static u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
2290
2291         if (!local->ops->config_interface || !netif_running(dev))
2292                 return 0;
2293
2294         memset(&conf, 0, sizeof(conf));
2295         conf.type = sdata->type;
2296         if (sdata->type == IEEE80211_IF_TYPE_STA ||
2297             sdata->type == IEEE80211_IF_TYPE_IBSS) {
2298                 if (local->sta_scanning &&
2299                     local->scan_dev == dev)
2300                         conf.bssid = scan_bssid;
2301                 else
2302                         conf.bssid = sdata->u.sta.bssid;
2303                 conf.ssid = sdata->u.sta.ssid;
2304                 conf.ssid_len = sdata->u.sta.ssid_len;
2305                 conf.generic_elem = sdata->u.sta.extra_ie;
2306                 conf.generic_elem_len = sdata->u.sta.extra_ie_len;
2307         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
2308                 conf.ssid = sdata->u.ap.ssid;
2309                 conf.ssid_len = sdata->u.ap.ssid_len;
2310                 conf.generic_elem = sdata->u.ap.generic_elem;
2311                 conf.generic_elem_len = sdata->u.ap.generic_elem_len;
2312                 conf.beacon = beacon;
2313                 conf.beacon_control = control;
2314         }
2315         return local->ops->config_interface(local_to_hw(local),
2316                                            dev->ifindex, &conf);
2317 }
2318
2319 int ieee80211_if_config(struct net_device *dev)
2320 {
2321         return __ieee80211_if_config(dev, NULL, NULL);
2322 }
2323
2324 int ieee80211_if_config_beacon(struct net_device *dev)
2325 {
2326         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2327         struct ieee80211_tx_control control;
2328         struct sk_buff *skb;
2329
2330         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
2331                 return 0;
2332         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
2333         if (!skb)
2334                 return -ENOMEM;
2335         return __ieee80211_if_config(dev, skb, &control);
2336 }
2337
2338 int ieee80211_hw_config(struct ieee80211_local *local)
2339 {
2340         struct ieee80211_hw_mode *mode;
2341         struct ieee80211_channel *chan;
2342         int ret = 0;
2343
2344         if (local->sta_scanning) {
2345                 chan = local->scan_channel;
2346                 mode = local->scan_hw_mode;
2347         } else {
2348                 chan = local->oper_channel;
2349                 mode = local->oper_hw_mode;
2350         }
2351
2352         local->hw.conf.channel = chan->chan;
2353         local->hw.conf.channel_val = chan->val;
2354         local->hw.conf.power_level = chan->power_level;
2355         local->hw.conf.freq = chan->freq;
2356         local->hw.conf.phymode = mode->mode;
2357         local->hw.conf.antenna_max = chan->antenna_max;
2358         local->hw.conf.chan = chan;
2359         local->hw.conf.mode = mode;
2360
2361 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2362         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
2363                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
2364                local->hw.conf.phymode);
2365 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2366
2367         if (local->ops->config)
2368                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
2369
2370         return ret;
2371 }
2372
2373
2374 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
2375 {
2376         /* FIX: what would be proper limits for MTU?
2377          * This interface uses 802.3 frames. */
2378         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
2379                 printk(KERN_WARNING "%s: invalid MTU %d\n",
2380                        dev->name, new_mtu);
2381                 return -EINVAL;
2382         }
2383
2384 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2385         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2386 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2387         dev->mtu = new_mtu;
2388         return 0;
2389 }
2390
2391
2392 static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
2393 {
2394         /* FIX: what would be proper limits for MTU?
2395          * This interface uses 802.11 frames. */
2396         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
2397                 printk(KERN_WARNING "%s: invalid MTU %d\n",
2398                        dev->name, new_mtu);
2399                 return -EINVAL;
2400         }
2401
2402 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2403         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2404 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2405         dev->mtu = new_mtu;
2406         return 0;
2407 }
2408
2409 enum netif_tx_lock_class {
2410         TX_LOCK_NORMAL,
2411         TX_LOCK_MASTER,
2412 };
2413
2414 static inline void netif_tx_lock_nested(struct net_device *dev, int subclass)
2415 {
2416         spin_lock_nested(&dev->_xmit_lock, subclass);
2417         dev->xmit_lock_owner = smp_processor_id();
2418 }
2419
2420 static void ieee80211_set_multicast_list(struct net_device *dev)
2421 {
2422         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2423         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2424         unsigned short flags;
2425
2426         netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
2427         if (((dev->flags & IFF_ALLMULTI) != 0) ^ (sdata->allmulti != 0)) {
2428                 if (sdata->allmulti) {
2429                         sdata->allmulti = 0;
2430                         local->iff_allmultis--;
2431                 } else {
2432                         sdata->allmulti = 1;
2433                         local->iff_allmultis++;
2434                 }
2435         }
2436         if (((dev->flags & IFF_PROMISC) != 0) ^ (sdata->promisc != 0)) {
2437                 if (sdata->promisc) {
2438                         sdata->promisc = 0;
2439                         local->iff_promiscs--;
2440                 } else {
2441                         sdata->promisc = 1;
2442                         local->iff_promiscs++;
2443                 }
2444         }
2445         if (dev->mc_count != sdata->mc_count) {
2446                 local->mc_count = local->mc_count - sdata->mc_count +
2447                                   dev->mc_count;
2448                 sdata->mc_count = dev->mc_count;
2449         }
2450         if (local->ops->set_multicast_list) {
2451                 flags = local->mdev->flags;
2452                 if (local->iff_allmultis)
2453                         flags |= IFF_ALLMULTI;
2454                 if (local->iff_promiscs)
2455                         flags |= IFF_PROMISC;
2456                 read_lock(&local->sub_if_lock);
2457                 local->ops->set_multicast_list(local_to_hw(local), flags,
2458                                               local->mc_count);
2459                 read_unlock(&local->sub_if_lock);
2460         }
2461         netif_tx_unlock(local->mdev);
2462 }
2463
2464 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
2465                                                struct dev_mc_list *prev,
2466                                                void **ptr)
2467 {
2468         struct ieee80211_local *local = hw_to_local(hw);
2469         struct ieee80211_sub_if_data *sdata = *ptr;
2470         struct dev_mc_list *mc;
2471
2472         if (!prev) {
2473                 WARN_ON(sdata);
2474                 sdata = NULL;
2475         }
2476         if (!prev || !prev->next) {
2477                 if (sdata)
2478                         sdata = list_entry(sdata->list.next,
2479                                            struct ieee80211_sub_if_data, list);
2480                 else
2481                         sdata = list_entry(local->sub_if_list.next,
2482                                            struct ieee80211_sub_if_data, list);
2483                 if (&sdata->list != &local->sub_if_list)
2484                         mc = sdata->dev->mc_list;
2485                 else
2486                         mc = NULL;
2487         } else
2488                 mc = prev->next;
2489
2490         *ptr = sdata;
2491         return mc;
2492 }
2493 EXPORT_SYMBOL(ieee80211_get_mc_list_item);
2494
2495 static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
2496 {
2497         struct ieee80211_sub_if_data *sdata;
2498         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2499         return &(sdata->stats);
2500 }
2501
2502 static void ieee80211_if_shutdown(struct net_device *dev)
2503 {
2504         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2505         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2506
2507         ASSERT_RTNL();
2508         switch (sdata->type) {
2509         case IEEE80211_IF_TYPE_STA:
2510         case IEEE80211_IF_TYPE_IBSS:
2511                 sdata->u.sta.state = IEEE80211_DISABLED;
2512                 del_timer_sync(&sdata->u.sta.timer);
2513                 skb_queue_purge(&sdata->u.sta.skb_queue);
2514                 if (!local->ops->hw_scan &&
2515                     local->scan_dev == sdata->dev) {
2516                         local->sta_scanning = 0;
2517                         cancel_delayed_work(&local->scan_work);
2518                 }
2519                 flush_workqueue(local->hw.workqueue);
2520                 break;
2521         }
2522 }
2523
2524 static inline int identical_mac_addr_allowed(int type1, int type2)
2525 {
2526         return (type1 == IEEE80211_IF_TYPE_MNTR ||
2527                 type2 == IEEE80211_IF_TYPE_MNTR ||
2528                 (type1 == IEEE80211_IF_TYPE_AP &&
2529                  type2 == IEEE80211_IF_TYPE_WDS) ||
2530                 (type1 == IEEE80211_IF_TYPE_WDS &&
2531                  (type2 == IEEE80211_IF_TYPE_WDS ||
2532                   type2 == IEEE80211_IF_TYPE_AP)) ||
2533                 (type1 == IEEE80211_IF_TYPE_AP &&
2534                  type2 == IEEE80211_IF_TYPE_VLAN) ||
2535                 (type1 == IEEE80211_IF_TYPE_VLAN &&
2536                  (type2 == IEEE80211_IF_TYPE_AP ||
2537                   type2 == IEEE80211_IF_TYPE_VLAN)));
2538 }
2539
2540 static int ieee80211_master_open(struct net_device *dev)
2541 {
2542         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2543         struct ieee80211_sub_if_data *sdata;
2544         int res = -EOPNOTSUPP;
2545
2546         read_lock(&local->sub_if_lock);
2547         list_for_each_entry(sdata, &local->sub_if_list, list) {
2548                 if (sdata->dev != dev && netif_running(sdata->dev)) {
2549                         res = 0;
2550                         break;
2551                 }
2552         }
2553         read_unlock(&local->sub_if_lock);
2554         return res;
2555 }
2556
2557 static int ieee80211_master_stop(struct net_device *dev)
2558 {
2559         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2560         struct ieee80211_sub_if_data *sdata;
2561
2562         read_lock(&local->sub_if_lock);
2563         list_for_each_entry(sdata, &local->sub_if_list, list)
2564                 if (sdata->dev != dev && netif_running(sdata->dev))
2565                         dev_close(sdata->dev);
2566         read_unlock(&local->sub_if_lock);
2567
2568         return 0;
2569 }
2570
2571 static int ieee80211_mgmt_open(struct net_device *dev)
2572 {
2573         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2574
2575         if (!netif_running(local->mdev))
2576                 return -EOPNOTSUPP;
2577         return 0;
2578 }
2579
2580 static int ieee80211_mgmt_stop(struct net_device *dev)
2581 {
2582         return 0;
2583 }
2584
2585 /* Check if running monitor interfaces should go to a "soft monitor" mode
2586  * and switch them if necessary. */
2587 static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
2588 {
2589         struct ieee80211_if_init_conf conf;
2590
2591         if (local->open_count && local->open_count == local->monitors &&
2592             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
2593             local->ops->remove_interface) {
2594                 conf.if_id = -1;
2595                 conf.type = IEEE80211_IF_TYPE_MNTR;
2596                 conf.mac_addr = NULL;
2597                 local->ops->remove_interface(local_to_hw(local), &conf);
2598         }
2599 }
2600
2601 /* Check if running monitor interfaces should go to a "hard monitor" mode
2602  * and switch them if necessary. */
2603 static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
2604 {
2605         struct ieee80211_if_init_conf conf;
2606
2607         if (local->open_count && local->open_count == local->monitors &&
2608             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2609                 conf.if_id = -1;
2610                 conf.type = IEEE80211_IF_TYPE_MNTR;
2611                 conf.mac_addr = NULL;
2612                 local->ops->add_interface(local_to_hw(local), &conf);
2613         }
2614 }
2615
2616 static int ieee80211_open(struct net_device *dev)
2617 {
2618         struct ieee80211_sub_if_data *sdata, *nsdata;
2619         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2620         struct ieee80211_if_init_conf conf;
2621         int res;
2622
2623         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2624         read_lock(&local->sub_if_lock);
2625         list_for_each_entry(nsdata, &local->sub_if_list, list) {
2626                 struct net_device *ndev = nsdata->dev;
2627
2628                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
2629                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
2630                     !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
2631                         read_unlock(&local->sub_if_lock);
2632                         return -ENOTUNIQ;
2633                 }
2634         }
2635         read_unlock(&local->sub_if_lock);
2636
2637         if (sdata->type == IEEE80211_IF_TYPE_WDS &&
2638             is_zero_ether_addr(sdata->u.wds.remote_addr))
2639                 return -ENOLINK;
2640
2641         if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
2642             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2643                 /* run the interface in a "soft monitor" mode */
2644                 local->monitors++;
2645                 local->open_count++;
2646                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2647                 return 0;
2648         }
2649         ieee80211_start_soft_monitor(local);
2650
2651         conf.if_id = dev->ifindex;
2652         conf.type = sdata->type;
2653         conf.mac_addr = dev->dev_addr;
2654         res = local->ops->add_interface(local_to_hw(local), &conf);
2655         if (res) {
2656                 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
2657                         ieee80211_start_hard_monitor(local);
2658                 return res;
2659         }
2660
2661         if (local->open_count == 0) {
2662                 res = 0;
2663                 tasklet_enable(&local->tx_pending_tasklet);
2664                 tasklet_enable(&local->tasklet);
2665                 if (local->ops->open)
2666                         res = local->ops->open(local_to_hw(local));
2667                 if (res == 0) {
2668                         res = dev_open(local->mdev);
2669                         if (res) {
2670                                 if (local->ops->stop)
2671                                         local->ops->stop(local_to_hw(local));
2672                         } else {
2673                                 res = ieee80211_hw_config(local);
2674                                 if (res && local->ops->stop)
2675                                         local->ops->stop(local_to_hw(local));
2676                                 else if (!res && local->apdev)
2677                                         dev_open(local->apdev);
2678                         }
2679                 }
2680                 if (res) {
2681                         if (local->ops->remove_interface)
2682                                 local->ops->remove_interface(local_to_hw(local),
2683                                                             &conf);
2684                         return res;
2685                 }
2686         }
2687         local->open_count++;
2688
2689         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2690                 local->monitors++;
2691                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2692         } else
2693                 ieee80211_if_config(dev);
2694
2695         if (sdata->type == IEEE80211_IF_TYPE_STA &&
2696             !local->user_space_mlme)
2697                 netif_carrier_off(dev);
2698         else
2699                 netif_carrier_on(dev);
2700
2701         netif_start_queue(dev);
2702         return 0;
2703 }
2704
2705
2706 static int ieee80211_stop(struct net_device *dev)
2707 {
2708         struct ieee80211_sub_if_data *sdata;
2709         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2710
2711         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2712
2713         if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
2714             local->open_count > 1 &&
2715             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2716                 /* remove "soft monitor" interface */
2717                 local->open_count--;
2718                 local->monitors--;
2719                 if (!local->monitors)
2720                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2721                 return 0;
2722         }
2723
2724         netif_stop_queue(dev);
2725         ieee80211_if_shutdown(dev);
2726
2727         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2728                 local->monitors--;
2729                 if (!local->monitors)
2730                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2731         }
2732
2733         local->open_count--;
2734         if (local->open_count == 0) {
2735                 if (netif_running(local->mdev))
2736                         dev_close(local->mdev);
2737                 if (local->apdev)
2738                         dev_close(local->apdev);
2739                 if (local->ops->stop)
2740                         local->ops->stop(local_to_hw(local));
2741                 tasklet_disable(&local->tx_pending_tasklet);
2742                 tasklet_disable(&local->tasklet);
2743         }
2744         if (local->ops->remove_interface) {
2745                 struct ieee80211_if_init_conf conf;
2746
2747                 conf.if_id = dev->ifindex;
2748                 conf.type = sdata->type;
2749                 conf.mac_addr = dev->dev_addr;
2750                 local->ops->remove_interface(local_to_hw(local), &conf);
2751         }
2752
2753         ieee80211_start_hard_monitor(local);
2754
2755         return 0;
2756 }
2757
2758
2759 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
2760 {
2761         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
2762         return ETH_ALEN;
2763 }
2764
2765 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
2766 {
2767         return compare_ether_addr(raddr, addr) == 0 ||
2768                is_broadcast_ether_addr(raddr);
2769 }
2770
2771
2772 static ieee80211_txrx_result
2773 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
2774 {
2775         struct net_device *dev = rx->dev;
2776         struct ieee80211_local *local = rx->local;
2777         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
2778         u16 fc, hdrlen, ethertype;
2779         u8 *payload;
2780         u8 dst[ETH_ALEN];
2781         u8 src[ETH_ALEN];
2782         struct sk_buff *skb = rx->skb, *skb2;
2783         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2784
2785         fc = rx->fc;
2786         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
2787                 return TXRX_CONTINUE;
2788
2789         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
2790                 return TXRX_DROP;
2791
2792         hdrlen = ieee80211_get_hdrlen(fc);
2793
2794         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
2795          * header
2796          * IEEE 802.11 address fields:
2797          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
2798          *   0     0   DA    SA    BSSID n/a
2799          *   0     1   DA    BSSID SA    n/a
2800          *   1     0   BSSID SA    DA    n/a
2801          *   1     1   RA    TA    DA    SA
2802          */
2803
2804         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
2805         case IEEE80211_FCTL_TODS:
2806                 /* BSSID SA DA */
2807                 memcpy(dst, hdr->addr3, ETH_ALEN);
2808                 memcpy(src, hdr->addr2, ETH_ALEN);
2809
2810                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
2811                              sdata->type != IEEE80211_IF_TYPE_VLAN)) {
2812                         printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
2813                                MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
2814                                dev->name, MAC_ARG(hdr->addr1),
2815                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
2816                         return TXRX_DROP;
2817                 }
2818                 break;
2819         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
2820                 /* RA TA DA SA */
2821                 memcpy(dst, hdr->addr3, ETH_ALEN);
2822                 memcpy(src, hdr->addr4, ETH_ALEN);
2823
2824                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
2825                         printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
2826                                MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
2827                                MAC_FMT ")\n",
2828                                rx->dev->name, MAC_ARG(hdr->addr1),
2829                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
2830                                MAC_ARG(hdr->addr4));
2831                         return TXRX_DROP;
2832                 }
2833                 break;
2834         case IEEE80211_FCTL_FROMDS:
2835                 /* DA BSSID SA */
2836                 memcpy(dst, hdr->addr1, ETH_ALEN);
2837                 memcpy(src, hdr->addr3, ETH_ALEN);
2838
2839                 if (sdata->type != IEEE80211_IF_TYPE_STA) {
2840                         return TXRX_DROP;
2841                 }
2842                 break;
2843         case 0:
2844                 /* DA SA BSSID */
2845                 memcpy(dst, hdr->addr1, ETH_ALEN);
2846                 memcpy(src, hdr->addr2, ETH_ALEN);
2847
2848                 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
2849                         if (net_ratelimit()) {
2850                                 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
2851                                        MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
2852                                        ")\n",
2853                                        dev->name, MAC_ARG(hdr->addr1),
2854                                        MAC_ARG(hdr->addr2),
2855                                        MAC_ARG(hdr->addr3));
2856                         }
2857                         return TXRX_DROP;
2858                 }
2859                 break;
2860         }
2861
2862         payload = skb->data + hdrlen;
2863
2864         if (unlikely(skb->len - hdrlen < 8)) {
2865                 if (net_ratelimit()) {
2866                         printk(KERN_DEBUG "%s: RX too short data frame "
2867                                "payload\n", dev->name);
2868                 }
2869                 return TXRX_DROP;
2870         }
2871
2872         ethertype = (payload[6] << 8) | payload[7];
2873
2874         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
2875                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
2876                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
2877                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
2878                  * replace EtherType */
2879                 skb_pull(skb, hdrlen + 6);
2880                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
2881                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
2882         } else {
2883                 struct ethhdr *ehdr;
2884                 __be16 len;
2885                 skb_pull(skb, hdrlen);
2886                 len = htons(skb->len);
2887                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
2888                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
2889                 memcpy(ehdr->h_source, src, ETH_ALEN);
2890                 ehdr->h_proto = len;
2891         }
2892         skb->dev = dev;
2893
2894         skb2 = NULL;
2895
2896         sdata->stats.rx_packets++;
2897         sdata->stats.rx_bytes += skb->len;
2898
2899         if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
2900             || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
2901                 if (is_multicast_ether_addr(skb->data)) {
2902                         /* send multicast frames both to higher layers in
2903                          * local net stack and back to the wireless media */
2904                         skb2 = skb_copy(skb, GFP_ATOMIC);
2905                         if (!skb2)
2906                                 printk(KERN_DEBUG "%s: failed to clone "
2907                                        "multicast frame\n", dev->name);
2908                 } else {
2909                         struct sta_info *dsta;
2910                         dsta = sta_info_get(local, skb->data);
2911                         if (dsta && !dsta->dev) {
2912                                 printk(KERN_DEBUG "Station with null dev "
2913                                        "structure!\n");
2914                         } else if (dsta && dsta->dev == dev) {
2915                                 /* Destination station is associated to this
2916                                  * AP, so send the frame directly to it and
2917                                  * do not pass the frame to local net stack.
2918                                  */
2919                                 skb2 = skb;
2920                                 skb = NULL;
2921                         }
2922                         if (dsta)
2923                                 sta_info_put(dsta);
2924                 }
2925         }
2926
2927         if (skb) {
2928                 /* deliver to local stack */
2929                 skb->protocol = eth_type_trans(skb, dev);
2930                 memset(skb->cb, 0, sizeof(skb->cb));
2931                 netif_rx(skb);
2932         }
2933
2934         if (skb2) {
2935                 /* send to wireless media */
2936                 skb2->protocol = __constant_htons(ETH_P_802_3);
2937                 skb_set_network_header(skb2, 0);
2938                 skb_set_mac_header(skb2, 0);
2939                 dev_queue_xmit(skb2);
2940         }
2941
2942         return TXRX_QUEUED;
2943 }
2944
2945
2946 static struct ieee80211_rate *
2947 ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
2948 {
2949         struct ieee80211_hw_mode *mode;
2950         int r;
2951
2952         list_for_each_entry(mode, &local->modes_list, list) {
2953                 if (mode->mode != phymode)
2954                         continue;
2955                 for (r = 0; r < mode->num_rates; r++) {
2956                         struct ieee80211_rate *rate = &mode->rates[r];
2957                         if (rate->val == hw_rate ||
2958                             (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
2959                              rate->val2 == hw_rate))
2960                                 return rate;
2961                 }
2962         }
2963
2964         return NULL;
2965 }
2966
2967 static void
2968 ieee80211_fill_frame_info(struct ieee80211_local *local,
2969                           struct ieee80211_frame_info *fi,
2970                           struct ieee80211_rx_status *status)
2971 {
2972         if (status) {
2973                 struct timespec ts;
2974                 struct ieee80211_rate *rate;
2975
2976                 jiffies_to_timespec(jiffies, &ts);
2977                 fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
2978                                            ts.tv_nsec / 1000);
2979                 fi->mactime = cpu_to_be64(status->mactime);
2980                 switch (status->phymode) {
2981                 case MODE_IEEE80211A:
2982                         fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
2983                         break;
2984                 case MODE_IEEE80211B:
2985                         fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
2986                         break;
2987                 case MODE_IEEE80211G:
2988                         fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
2989                         break;
2990                 case MODE_ATHEROS_TURBO:
2991                         fi->phytype =
2992                                 htonl(ieee80211_phytype_dsss_dot11_turbo);
2993                         break;
2994                 default:
2995                         fi->phytype = htonl(0xAAAAAAAA);
2996                         break;
2997                 }
2998                 fi->channel = htonl(status->channel);
2999                 rate = ieee80211_get_rate(local, status->phymode,
3000                                           status->rate);
3001                 if (rate) {
3002                         fi->datarate = htonl(rate->rate);
3003                         if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
3004                                 if (status->rate == rate->val)
3005                                         fi->preamble = htonl(2); /* long */
3006                                 else if (status->rate == rate->val2)
3007                                         fi->preamble = htonl(1); /* short */
3008                         } else
3009                                 fi->preamble = htonl(0);
3010                 } else {
3011                         fi->datarate = htonl(0);
3012                         fi->preamble = htonl(0);
3013                 }
3014
3015                 fi->antenna = htonl(status->antenna);
3016                 fi->priority = htonl(0xffffffff); /* no clue */
3017                 fi->ssi_type = htonl(ieee80211_ssi_raw);
3018                 fi->ssi_signal = htonl(status->ssi);
3019                 fi->ssi_noise = 0x00000000;
3020                 fi->encoding = 0;
3021         } else {
3022                 /* clear everything because we really don't know.
3023                  * the msg_type field isn't present on monitor frames
3024                  * so we don't know whether it will be present or not,
3025                  * but it's ok to not clear it since it'll be assigned
3026                  * anyway */
3027                 memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
3028
3029                 fi->ssi_type = htonl(ieee80211_ssi_none);
3030         }
3031         fi->version = htonl(IEEE80211_FI_VERSION);
3032         fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
3033 }
3034
3035 /* this routine is actually not just for this, but also
3036  * for pushing fake 'management' frames into userspace.
3037  * it shall be replaced by a netlink-based system. */
3038 void
3039 ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
3040                   struct ieee80211_rx_status *status, u32 msg_type)
3041 {
3042         struct ieee80211_frame_info *fi;
3043         const size_t hlen = sizeof(struct ieee80211_frame_info);
3044         struct ieee80211_sub_if_data *sdata;
3045
3046         skb->dev = local->apdev;
3047
3048         sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
3049
3050         if (skb_headroom(skb) < hlen) {
3051                 I802_DEBUG_INC(local->rx_expand_skb_head);
3052                 if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
3053                         dev_kfree_skb(skb);
3054                         return;
3055                 }
3056         }
3057
3058         fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
3059
3060         ieee80211_fill_frame_info(local, fi, status);
3061         fi->msg_type = htonl(msg_type);
3062
3063         sdata->stats.rx_packets++;
3064         sdata->stats.rx_bytes += skb->len;
3065
3066         skb_set_mac_header(skb, 0);
3067         skb->ip_summed = CHECKSUM_UNNECESSARY;
3068         skb->pkt_type = PACKET_OTHERHOST;
3069         skb->protocol = htons(ETH_P_802_2);
3070         memset(skb->cb, 0, sizeof(skb->cb));
3071         netif_rx(skb);
3072 }
3073
3074 static void
3075 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
3076                      struct ieee80211_rx_status *status)
3077 {
3078         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3079         struct ieee80211_sub_if_data *sdata;
3080         struct ieee80211_rate *rate;
3081         struct ieee80211_rtap_hdr {
3082                 struct ieee80211_radiotap_header hdr;
3083                 u8 flags;
3084                 u8 rate;
3085                 __le16 chan_freq;
3086                 __le16 chan_flags;
3087                 u8 antsignal;
3088         } __attribute__ ((packed)) *rthdr;
3089
3090         skb->dev = dev;
3091
3092         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3093
3094         if (status->flag & RX_FLAG_RADIOTAP)
3095                 goto out;
3096
3097         if (skb_headroom(skb) < sizeof(*rthdr)) {
3098                 I802_DEBUG_INC(local->rx_expand_skb_head);
3099                 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
3100                         dev_kfree_skb(skb);
3101                         return;
3102                 }
3103         }
3104
3105         rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
3106         memset(rthdr, 0, sizeof(*rthdr));
3107         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
3108         rthdr->hdr.it_present =
3109                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3110                             (1 << IEEE80211_RADIOTAP_RATE) |
3111                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
3112                             (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
3113         rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
3114                        IEEE80211_RADIOTAP_F_FCS : 0;
3115         rate = ieee80211_get_rate(local, status->phymode, status->rate);
3116         if (rate)
3117                 rthdr->rate = rate->rate / 5;
3118         rthdr->chan_freq = cpu_to_le16(status->freq);
3119         rthdr->chan_flags =
3120                 status->phymode == MODE_IEEE80211A ?
3121                 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
3122                 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
3123         rthdr->antsignal = status->ssi;
3124
3125  out:
3126         sdata->stats.rx_packets++;
3127         sdata->stats.rx_bytes += skb->len;
3128
3129         skb_set_mac_header(skb, 0);
3130         skb->ip_summed = CHECKSUM_UNNECESSARY;
3131         skb->pkt_type = PACKET_OTHERHOST;
3132         skb->protocol = htons(ETH_P_802_2);
3133         memset(skb->cb, 0, sizeof(skb->cb));
3134         netif_rx(skb);
3135 }
3136
3137 int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
3138                            int radar, int radar_type)
3139 {
3140         struct sk_buff *skb;
3141         struct ieee80211_radar_info *msg;
3142         struct ieee80211_local *local = hw_to_local(hw);
3143
3144         if (!local->apdev)
3145                 return 0;
3146
3147         skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
3148                             sizeof(struct ieee80211_radar_info));
3149
3150         if (!skb)
3151                 return -ENOMEM;
3152         skb_reserve(skb, sizeof(struct ieee80211_frame_info));
3153
3154         msg = (struct ieee80211_radar_info *)
3155                 skb_put(skb, sizeof(struct ieee80211_radar_info));
3156         msg->channel = channel;
3157         msg->radar = radar;
3158         msg->radar_type = radar_type;
3159
3160         ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
3161         return 0;
3162 }
3163 EXPORT_SYMBOL(ieee80211_radar_status);
3164
3165
3166 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
3167 {
3168         struct ieee80211_sub_if_data *sdata;
3169         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3170
3171         if (sdata->bss)
3172                 atomic_inc(&sdata->bss->num_sta_ps);
3173         sta->flags |= WLAN_STA_PS;
3174         sta->pspoll = 0;
3175 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3176         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
3177                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3178 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3179 }
3180
3181
3182 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
3183 {
3184         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3185         struct sk_buff *skb;
3186         int sent = 0;
3187         struct ieee80211_sub_if_data *sdata;
3188         struct ieee80211_tx_packet_data *pkt_data;
3189
3190         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3191         if (sdata->bss)
3192                 atomic_dec(&sdata->bss->num_sta_ps);
3193         sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
3194         sta->pspoll = 0;
3195         if (!skb_queue_empty(&sta->ps_tx_buf)) {
3196                 if (local->ops->set_tim)
3197                         local->ops->set_tim(local_to_hw(local), sta->aid, 0);
3198                 if (sdata->bss)
3199                         bss_tim_clear(local, sdata->bss, sta->aid);
3200         }
3201 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3202         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
3203                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3204 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3205         /* Send all buffered frames to the station */
3206         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
3207                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3208                 sent++;
3209                 pkt_data->requeue = 1;
3210                 dev_queue_xmit(skb);
3211         }
3212         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
3213                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3214                 local->total_ps_buffered--;
3215                 sent++;
3216 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3217                 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
3218                        "since STA not sleeping anymore\n", dev->name,
3219                        MAC_ARG(sta->addr), sta->aid);
3220 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3221                 pkt_data->requeue = 1;
3222                 dev_queue_xmit(skb);
3223         }
3224
3225         return sent;
3226 }
3227
3228
3229 static ieee80211_txrx_result
3230 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
3231 {
3232         struct sk_buff *skb;
3233         int no_pending_pkts;
3234
3235         if (likely(!rx->sta ||
3236                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
3237                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
3238                    !rx->u.rx.ra_match))
3239                 return TXRX_CONTINUE;
3240
3241         skb = skb_dequeue(&rx->sta->tx_filtered);
3242         if (!skb) {
3243                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
3244                 if (skb)
3245                         rx->local->total_ps_buffered--;
3246         }
3247         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
3248                 skb_queue_empty(&rx->sta->ps_tx_buf);
3249
3250         if (skb) {
3251                 struct ieee80211_hdr *hdr =
3252                         (struct ieee80211_hdr *) skb->data;
3253
3254                 /* tell TX path to send one frame even though the STA may
3255                  * still remain is PS mode after this frame exchange */
3256                 rx->sta->pspoll = 1;
3257
3258 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3259                 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
3260                        "after %d)\n",
3261                        MAC_ARG(rx->sta->addr), rx->sta->aid,
3262                        skb_queue_len(&rx->sta->ps_tx_buf));
3263 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3264
3265                 /* Use MoreData flag to indicate whether there are more
3266                  * buffered frames for this STA */
3267                 if (no_pending_pkts) {
3268                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
3269                         rx->sta->flags &= ~WLAN_STA_TIM;
3270                 } else
3271                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3272
3273                 dev_queue_xmit(skb);
3274
3275                 if (no_pending_pkts) {
3276                         if (rx->local->ops->set_tim)
3277                                 rx->local->ops->set_tim(local_to_hw(rx->local),
3278                                                        rx->sta->aid, 0);
3279                         if (rx->sdata->bss)
3280                                 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
3281                 }
3282 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3283         } else if (!rx->u.rx.sent_ps_buffered) {
3284                 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
3285                        "though there is no buffered frames for it\n",
3286                        rx->dev->name, MAC_ARG(rx->sta->addr));
3287 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3288
3289         }
3290
3291         /* Free PS Poll skb here instead of returning TXRX_DROP that would
3292          * count as an dropped frame. */
3293         dev_kfree_skb(rx->skb);
3294
3295         return TXRX_QUEUED;
3296 }
3297
3298
3299 static inline struct ieee80211_fragment_entry *
3300 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
3301                          unsigned int frag, unsigned int seq, int rx_queue,
3302                          struct sk_buff **skb)
3303 {
3304         struct ieee80211_fragment_entry *entry;
3305         int idx;
3306
3307         idx = sdata->fragment_next;
3308         entry = &sdata->fragments[sdata->fragment_next++];
3309         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
3310                 sdata->fragment_next = 0;
3311
3312         if (!skb_queue_empty(&entry->skb_list)) {
3313 #ifdef CONFIG_MAC80211_DEBUG
3314                 struct ieee80211_hdr *hdr =
3315                         (struct ieee80211_hdr *) entry->skb_list.next->data;
3316                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
3317                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
3318                        "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
3319                        sdata->dev->name, idx,
3320                        jiffies - entry->first_frag_time, entry->seq,
3321                        entry->last_frag, MAC_ARG(hdr->addr1),
3322                        MAC_ARG(hdr->addr2));
3323 #endif /* CONFIG_MAC80211_DEBUG */
3324                 __skb_queue_purge(&entry->skb_list);
3325         }
3326
3327         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
3328         *skb = NULL;
3329         entry->first_frag_time = jiffies;
3330         entry->seq = seq;
3331         entry->rx_queue = rx_queue;
3332         entry->last_frag = frag;
3333         entry->ccmp = 0;
3334         entry->extra_len = 0;
3335
3336         return entry;
3337 }
3338
3339
3340 static inline struct ieee80211_fragment_entry *
3341 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
3342                           u16 fc, unsigned int frag, unsigned int seq,
3343                           int rx_queue, struct ieee80211_hdr *hdr)
3344 {
3345         struct ieee80211_fragment_entry *entry;
3346         int i, idx;
3347
3348         idx = sdata->fragment_next;
3349         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
3350                 struct ieee80211_hdr *f_hdr;
3351                 u16 f_fc;
3352
3353                 idx--;
3354                 if (idx < 0)
3355                         idx = IEEE80211_FRAGMENT_MAX - 1;
3356
3357                 entry = &sdata->fragments[idx];
3358                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
3359                     entry->rx_queue != rx_queue ||
3360                     entry->last_frag + 1 != frag)
3361                         continue;
3362
3363                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
3364                 f_fc = le16_to_cpu(f_hdr->frame_control);
3365
3366                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
3367                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
3368                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
3369                         continue;
3370
3371                 if (entry->first_frag_time + 2 * HZ < jiffies) {
3372                         __skb_queue_purge(&entry->skb_list);
3373                         continue;
3374                 }
3375                 return entry;
3376         }
3377
3378         return NULL;
3379 }
3380
3381
3382 static ieee80211_txrx_result
3383 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
3384 {
3385         struct ieee80211_hdr *hdr;
3386         u16 sc;
3387         unsigned int frag, seq;
3388         struct ieee80211_fragment_entry *entry;
3389         struct sk_buff *skb;
3390
3391         hdr = (struct ieee80211_hdr *) rx->skb->data;
3392         sc = le16_to_cpu(hdr->seq_ctrl);
3393         frag = sc & IEEE80211_SCTL_FRAG;
3394
3395         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
3396                    (rx->skb)->len < 24 ||
3397                    is_multicast_ether_addr(hdr->addr1))) {
3398                 /* not fragmented */
3399                 goto out;
3400         }
3401         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
3402
3403         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
3404
3405         if (frag == 0) {
3406                 /* This is the first fragment of a new frame. */
3407                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
3408                                                  rx->u.rx.queue, &(rx->skb));
3409                 if (rx->key && rx->key->alg == ALG_CCMP &&
3410                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
3411                         /* Store CCMP PN so that we can verify that the next
3412                          * fragment has a sequential PN value. */
3413                         entry->ccmp = 1;
3414                         memcpy(entry->last_pn,
3415                                rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
3416                                CCMP_PN_LEN);
3417                 }
3418                 return TXRX_QUEUED;
3419         }
3420
3421         /* This is a fragment for a frame that should already be pending in
3422          * fragment cache. Add this fragment to the end of the pending entry.
3423          */
3424         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
3425                                           rx->u.rx.queue, hdr);
3426         if (!entry) {
3427                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3428                 return TXRX_DROP;
3429         }
3430
3431         /* Verify that MPDUs within one MSDU have sequential PN values.
3432          * (IEEE 802.11i, 8.3.3.4.5) */
3433         if (entry->ccmp) {
3434                 int i;
3435                 u8 pn[CCMP_PN_LEN], *rpn;
3436                 if (!rx->key || rx->key->alg != ALG_CCMP)
3437                         return TXRX_DROP;
3438                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
3439                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
3440                         pn[i]++;
3441                         if (pn[i])
3442                                 break;
3443                 }
3444                 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
3445                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
3446                         printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
3447                                " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
3448                                "(expected %02x%02x%02x%02x%02x%02x)\n",
3449                                rx->dev->name, MAC_ARG(hdr->addr2),
3450                                rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
3451                                pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
3452                         return TXRX_DROP;
3453                 }
3454                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
3455         }
3456
3457         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
3458         __skb_queue_tail(&entry->skb_list, rx->skb);
3459         entry->last_frag = frag;
3460         entry->extra_len += rx->skb->len;
3461         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
3462                 rx->skb = NULL;
3463                 return TXRX_QUEUED;
3464         }
3465
3466         rx->skb = __skb_dequeue(&entry->skb_list);
3467         if (skb_tailroom(rx->skb) < entry->extra_len) {
3468                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
3469                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
3470                                               GFP_ATOMIC))) {
3471                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3472                         __skb_queue_purge(&entry->skb_list);
3473                         return TXRX_DROP;
3474                 }
3475         }
3476         while ((skb = __skb_dequeue(&entry->skb_list))) {
3477                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
3478                 dev_kfree_skb(skb);
3479         }
3480
3481         /* Complete frame has been reassembled - process it now */
3482         rx->fragmented = 1;
3483
3484  out:
3485         if (rx->sta)
3486                 rx->sta->rx_packets++;
3487         if (is_multicast_ether_addr(hdr->addr1))
3488                 rx->local->dot11MulticastReceivedFrameCount++;
3489         else
3490                 ieee80211_led_rx(rx->local);
3491         return TXRX_CONTINUE;
3492 }
3493
3494
3495 static ieee80211_txrx_result
3496 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
3497 {
3498         if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
3499                 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
3500                 return TXRX_QUEUED;
3501         }
3502
3503         if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
3504                 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb));
3505
3506         return TXRX_CONTINUE;
3507 }
3508
3509
3510 static ieee80211_txrx_result
3511 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
3512 {
3513         struct ieee80211_hdr *hdr;
3514         int always_sta_key;
3515         hdr = (struct ieee80211_hdr *) rx->skb->data;
3516
3517         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
3518         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
3519                 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
3520                              rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
3521                              hdr->seq_ctrl)) {
3522                         if (rx->u.rx.ra_match) {
3523                                 rx->local->dot11FrameDuplicateCount++;
3524                                 rx->sta->num_duplicates++;
3525                         }
3526                         return TXRX_DROP;
3527                 } else
3528                         rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
3529         }
3530
3531         if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
3532             rx->skb->len > FCS_LEN)
3533                 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
3534
3535         if (unlikely(rx->skb->len < 16)) {
3536                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
3537                 return TXRX_DROP;
3538         }
3539
3540         if (!rx->u.rx.ra_match)
3541                 rx->skb->pkt_type = PACKET_OTHERHOST;
3542         else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
3543                 rx->skb->pkt_type = PACKET_HOST;
3544         else if (is_multicast_ether_addr(hdr->addr1)) {
3545                 if (is_broadcast_ether_addr(hdr->addr1))
3546                         rx->skb->pkt_type = PACKET_BROADCAST;
3547                 else
3548                         rx->skb->pkt_type = PACKET_MULTICAST;
3549         } else
3550                 rx->skb->pkt_type = PACKET_OTHERHOST;
3551
3552         /* Drop disallowed frame classes based on STA auth/assoc state;
3553          * IEEE 802.11, Chap 5.5.
3554          *
3555          * 80211.o does filtering only based on association state, i.e., it
3556          * drops Class 3 frames from not associated stations. hostapd sends
3557          * deauth/disassoc frames when needed. In addition, hostapd is
3558          * responsible for filtering on both auth and assoc states.
3559          */
3560         if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
3561                       ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
3562                        (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
3563                      rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
3564                      (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
3565                 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
3566                      !(rx->fc & IEEE80211_FCTL_TODS) &&
3567                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
3568                     || !rx->u.rx.ra_match) {
3569                         /* Drop IBSS frames and frames for other hosts
3570                          * silently. */
3571                         return TXRX_DROP;
3572                 }
3573
3574                 if (!rx->local->apdev)
3575                         return TXRX_DROP;
3576
3577                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3578                                   ieee80211_msg_sta_not_assoc);
3579                 return TXRX_QUEUED;
3580         }
3581
3582         if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
3583                 always_sta_key = 0;
3584         else
3585                 always_sta_key = 1;
3586
3587         if (rx->sta && rx->sta->key && always_sta_key) {
3588                 rx->key = rx->sta->key;
3589         } else {
3590                 if (rx->sta && rx->sta->key)
3591                         rx->key = rx->sta->key;
3592                 else
3593                         rx->key = rx->sdata->default_key;
3594
3595                 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3596                     rx->fc & IEEE80211_FCTL_PROTECTED) {
3597                         int keyidx = ieee80211_wep_get_keyidx(rx->skb);
3598
3599                         if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
3600                             (!rx->sta || !rx->sta->key || keyidx > 0))
3601                                 rx->key = rx->sdata->keys[keyidx];
3602
3603                         if (!rx->key) {
3604                                 if (!rx->u.rx.ra_match)
3605                                         return TXRX_DROP;
3606                                 printk(KERN_DEBUG "%s: RX WEP frame with "
3607                                        "unknown keyidx %d (A1=" MAC_FMT " A2="
3608                                        MAC_FMT " A3=" MAC_FMT ")\n",
3609                                        rx->dev->name, keyidx,
3610                                        MAC_ARG(hdr->addr1),
3611                                        MAC_ARG(hdr->addr2),
3612                                        MAC_ARG(hdr->addr3));
3613                                 if (!rx->local->apdev)
3614                                         return TXRX_DROP;
3615                                 ieee80211_rx_mgmt(
3616                                         rx->local, rx->skb, rx->u.rx.status,
3617                                         ieee80211_msg_wep_frame_unknown_key);
3618                                 return TXRX_QUEUED;
3619                         }
3620                 }
3621         }
3622
3623         if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
3624                 rx->key->tx_rx_count++;
3625                 if (unlikely(rx->local->key_tx_rx_threshold &&
3626                              rx->key->tx_rx_count >
3627                              rx->local->key_tx_rx_threshold)) {
3628                         ieee80211_key_threshold_notify(rx->dev, rx->key,
3629                                                        rx->sta);
3630                 }
3631         }
3632
3633         return TXRX_CONTINUE;
3634 }
3635
3636
3637 static ieee80211_txrx_result
3638 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
3639 {
3640         struct sta_info *sta = rx->sta;
3641         struct net_device *dev = rx->dev;
3642         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3643
3644         if (!sta)
3645                 return TXRX_CONTINUE;
3646
3647         /* Update last_rx only for IBSS packets which are for the current
3648          * BSSID to avoid keeping the current IBSS network alive in cases where
3649          * other STAs are using different BSSID. */
3650         if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
3651                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
3652                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
3653                         sta->last_rx = jiffies;
3654         } else
3655         if (!is_multicast_ether_addr(hdr->addr1) ||
3656             rx->sdata->type == IEEE80211_IF_TYPE_STA) {
3657                 /* Update last_rx only for unicast frames in order to prevent
3658                  * the Probe Request frames (the only broadcast frames from a
3659                  * STA in infrastructure mode) from keeping a connection alive.
3660                  */
3661                 sta->last_rx = jiffies;
3662         }
3663
3664         if (!rx->u.rx.ra_match)
3665                 return TXRX_CONTINUE;
3666
3667         sta->rx_fragments++;
3668         sta->rx_bytes += rx->skb->len;
3669         sta->last_rssi = (sta->last_rssi * 15 +
3670                           rx->u.rx.status->ssi) / 16;
3671         sta->last_signal = (sta->last_signal * 15 +
3672                             rx->u.rx.status->signal) / 16;
3673         sta->last_noise = (sta->last_noise * 15 +
3674                            rx->u.rx.status->noise) / 16;
3675
3676         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
3677                 /* Change STA power saving mode only in the end of a frame
3678                  * exchange sequence */
3679                 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
3680                         rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
3681                 else if (!(sta->flags & WLAN_STA_PS) &&
3682                          (rx->fc & IEEE80211_FCTL_PM))
3683                         ap_sta_ps_start(dev, sta);
3684         }
3685
3686         /* Drop data::nullfunc frames silently, since they are used only to
3687          * control station power saving mode. */
3688         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3689             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
3690                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
3691                 /* Update counter and free packet here to avoid counting this
3692                  * as a dropped packed. */
3693                 sta->rx_packets++;
3694                 dev_kfree_skb(rx->skb);
3695                 return TXRX_QUEUED;
3696         }
3697
3698         return TXRX_CONTINUE;
3699 } /* ieee80211_rx_h_sta_process */
3700
3701
3702 static ieee80211_txrx_result
3703 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
3704 {
3705         if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3706             (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
3707             !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
3708                 return TXRX_CONTINUE;
3709
3710         /* Check for weak IVs, if hwaccel did not remove IV from the frame */
3711         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
3712             rx->key->force_sw_encrypt) {
3713                 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
3714                 if (iv) {
3715                         rx->sta->wep_weak_iv_count++;
3716                 }
3717         }
3718
3719         return TXRX_CONTINUE;
3720 }
3721
3722
3723 static ieee80211_txrx_result
3724 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
3725 {
3726         /* If the device handles decryption totally, skip this test */
3727         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3728                 return TXRX_CONTINUE;
3729
3730         if ((rx->key && rx->key->alg != ALG_WEP) ||
3731             !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3732             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3733              ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3734               (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
3735                 return TXRX_CONTINUE;
3736
3737         if (!rx->key) {
3738                 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
3739                        rx->dev->name);
3740                 return TXRX_DROP;
3741         }
3742
3743         if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
3744             rx->key->force_sw_encrypt) {
3745                 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
3746                         printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
3747                                "failed\n", rx->dev->name);
3748                         return TXRX_DROP;
3749                 }
3750         } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
3751                 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
3752                 /* remove ICV */
3753                 skb_trim(rx->skb, rx->skb->len - 4);
3754         }
3755
3756         return TXRX_CONTINUE;
3757 }
3758
3759
3760 static ieee80211_txrx_result
3761 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
3762 {
3763         if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
3764             rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
3765                 /* Pass both encrypted and unencrypted EAPOL frames to user
3766                  * space for processing. */
3767                 if (!rx->local->apdev)
3768                         return TXRX_DROP;
3769                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3770                                   ieee80211_msg_normal);
3771                 return TXRX_QUEUED;
3772         }
3773
3774         if (unlikely(rx->sdata->ieee802_1x &&
3775                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3776                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3777                      (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
3778                      !ieee80211_is_eapol(rx->skb))) {
3779 #ifdef CONFIG_MAC80211_DEBUG
3780                 struct ieee80211_hdr *hdr =
3781                         (struct ieee80211_hdr *) rx->skb->data;
3782                 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
3783                        " (unauthorized port)\n", rx->dev->name,
3784                        MAC_ARG(hdr->addr2));
3785 #endif /* CONFIG_MAC80211_DEBUG */
3786                 return TXRX_DROP;
3787         }
3788
3789         return TXRX_CONTINUE;
3790 }
3791
3792
3793 static ieee80211_txrx_result
3794 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
3795 {
3796         /*  If the device handles decryption totally, skip this test */
3797         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3798                 return TXRX_CONTINUE;
3799
3800         /* Drop unencrypted frames if key is set. */
3801         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
3802                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3803                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3804                      (rx->key || rx->sdata->drop_unencrypted) &&
3805                      (rx->sdata->eapol == 0 ||
3806                       !ieee80211_is_eapol(rx->skb)))) {
3807                 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
3808                        "encryption\n", rx->dev->name);
3809                 return TXRX_DROP;
3810         }
3811         return TXRX_CONTINUE;
3812 }
3813
3814
3815 static ieee80211_txrx_result
3816 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
3817 {
3818         struct ieee80211_sub_if_data *sdata;
3819
3820         if (!rx->u.rx.ra_match)
3821                 return TXRX_DROP;
3822
3823         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
3824         if ((sdata->type == IEEE80211_IF_TYPE_STA ||
3825              sdata->type == IEEE80211_IF_TYPE_IBSS) &&
3826             !rx->local->user_space_mlme) {
3827                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
3828         } else {
3829                 /* Management frames are sent to hostapd for processing */
3830                 if (!rx->local->apdev)
3831                         return TXRX_DROP;
3832                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3833                                   ieee80211_msg_normal);
3834         }
3835         return TXRX_QUEUED;
3836 }
3837
3838
3839 static ieee80211_txrx_result
3840 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
3841 {
3842         struct ieee80211_local *local = rx->local;
3843         struct sk_buff *skb = rx->skb;
3844
3845         if (unlikely(local->sta_scanning != 0)) {
3846                 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
3847                 return TXRX_QUEUED;
3848         }
3849
3850         if (unlikely(rx->u.rx.in_scan)) {
3851                 /* scanning finished during invoking of handlers */
3852                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
3853                 return TXRX_DROP;
3854         }
3855
3856         return TXRX_CONTINUE;
3857 }
3858
3859
3860 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
3861                                             struct ieee80211_hdr *hdr,
3862                                             struct sta_info *sta,
3863                                             struct ieee80211_txrx_data *rx)
3864 {
3865         int keyidx, hdrlen;
3866
3867         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
3868         if (rx->skb->len >= hdrlen + 4)
3869                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
3870         else
3871                 keyidx = -1;
3872
3873         /* TODO: verify that this is not triggered by fragmented
3874          * frames (hw does not verify MIC for them). */
3875         printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
3876                "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
3877                dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
3878
3879         if (!sta) {
3880                 /* Some hardware versions seem to generate incorrect
3881                  * Michael MIC reports; ignore them to avoid triggering
3882                  * countermeasures. */
3883                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3884                        "error for unknown address " MAC_FMT "\n",
3885                        dev->name, MAC_ARG(hdr->addr2));
3886                 goto ignore;
3887         }
3888
3889         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
3890                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3891                        "error for a frame with no ISWEP flag (src "
3892                        MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
3893                 goto ignore;
3894         }
3895
3896         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3897             rx->sdata->type == IEEE80211_IF_TYPE_AP) {
3898                 keyidx = ieee80211_wep_get_keyidx(rx->skb);
3899                 /* AP with Pairwise keys support should never receive Michael
3900                  * MIC errors for non-zero keyidx because these are reserved
3901                  * for group keys and only the AP is sending real multicast
3902                  * frames in BSS. */
3903                 if (keyidx) {
3904                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
3905                                "a frame with non-zero keyidx (%d) (src " MAC_FMT
3906                                ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
3907                         goto ignore;
3908                 }
3909         }
3910
3911         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3912             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3913              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
3914                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3915                        "error for a frame that cannot be encrypted "
3916                        "(fc=0x%04x) (src " MAC_FMT ")\n",
3917                        dev->name, rx->fc, MAC_ARG(hdr->addr2));
3918                 goto ignore;
3919         }
3920
3921         do {
3922                 union iwreq_data wrqu;
3923                 char *buf = kmalloc(128, GFP_ATOMIC);
3924                 if (!buf)
3925                         break;
3926
3927                 /* TODO: needed parameters: count, key type, TSC */
3928                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
3929                         "keyid=%d %scast addr=" MAC_FMT ")",
3930                         keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
3931                         MAC_ARG(hdr->addr2));
3932                 memset(&wrqu, 0, sizeof(wrqu));
3933                 wrqu.data.length = strlen(buf);
3934                 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
3935                 kfree(buf);
3936         } while (0);
3937
3938         /* TODO: consider verifying the MIC error report with software
3939          * implementation if we get too many spurious reports from the
3940          * hardware. */
3941         if (!rx->local->apdev)
3942                 goto ignore;
3943         ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3944                           ieee80211_msg_michael_mic_failure);
3945         return;
3946
3947  ignore:
3948         dev_kfree_skb(rx->skb);
3949         rx->skb = NULL;
3950 }
3951
3952 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
3953                                 struct ieee80211_local *local,
3954                                 ieee80211_rx_handler *handlers,
3955                                 struct ieee80211_txrx_data *rx,
3956                                 struct sta_info *sta)
3957 {
3958         ieee80211_rx_handler *handler;
3959         ieee80211_txrx_result res = TXRX_DROP;
3960
3961         for (handler = handlers; *handler != NULL; handler++) {
3962                 res = (*handler)(rx);
3963                 if (res != TXRX_CONTINUE) {
3964                         if (res == TXRX_DROP) {
3965                                 I802_DEBUG_INC(local->rx_handlers_drop);
3966                                 if (sta)
3967                                         sta->rx_dropped++;
3968                         }
3969                         if (res == TXRX_QUEUED)
3970                                 I802_DEBUG_INC(local->rx_handlers_queued);
3971                         break;
3972                 }
3973         }
3974
3975         if (res == TXRX_DROP) {
3976                 dev_kfree_skb(rx->skb);
3977         }
3978         return res;
3979 }
3980
3981 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
3982                                                 ieee80211_rx_handler *handlers,
3983                                                 struct ieee80211_txrx_data *rx,
3984                                                 struct sta_info *sta)
3985 {
3986         if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
3987             TXRX_CONTINUE)
3988                 dev_kfree_skb(rx->skb);
3989 }
3990
3991 /*
3992  * This is the receive path handler. It is called by a low level driver when an
3993  * 802.11 MPDU is received from the hardware.
3994  */
3995 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
3996                     struct ieee80211_rx_status *status)
3997 {
3998         struct ieee80211_local *local = hw_to_local(hw);
3999         struct ieee80211_sub_if_data *sdata;
4000         struct sta_info *sta;
4001         struct ieee80211_hdr *hdr;
4002         struct ieee80211_txrx_data rx;
4003         u16 type;
4004         int multicast;
4005         int radiotap_len = 0;
4006
4007         if (status->flag & RX_FLAG_RADIOTAP) {
4008                 radiotap_len = ieee80211_get_radiotap_len(skb);
4009                 skb_pull(skb, radiotap_len);
4010         }
4011
4012         hdr = (struct ieee80211_hdr *) skb->data;
4013         memset(&rx, 0, sizeof(rx));
4014         rx.skb = skb;
4015         rx.local = local;
4016
4017         rx.u.rx.status = status;
4018         rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
4019         type = rx.fc & IEEE80211_FCTL_FTYPE;
4020         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
4021                 local->dot11ReceivedFragmentCount++;
4022         multicast = is_multicast_ether_addr(hdr->addr1);
4023
4024         if (skb->len >= 16)
4025                 sta = rx.sta = sta_info_get(local, hdr->addr2);
4026         else
4027                 sta = rx.sta = NULL;
4028
4029         if (sta) {
4030                 rx.dev = sta->dev;
4031                 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
4032         }
4033
4034         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
4035                 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
4036                 goto end;
4037         }
4038
4039         if (unlikely(local->sta_scanning))
4040                 rx.u.rx.in_scan = 1;
4041
4042         if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
4043                                            sta) != TXRX_CONTINUE)
4044                 goto end;
4045         skb = rx.skb;
4046
4047         skb_push(skb, radiotap_len);
4048         if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
4049             !local->iff_promiscs && !multicast) {
4050                 rx.u.rx.ra_match = 1;
4051                 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
4052                                              sta);
4053         } else {
4054                 struct ieee80211_sub_if_data *prev = NULL;
4055                 struct sk_buff *skb_new;
4056                 u8 *bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
4057
4058                 read_lock(&local->sub_if_lock);
4059                 list_for_each_entry(sdata, &local->sub_if_list, list) {
4060                         rx.u.rx.ra_match = 1;
4061                         switch (sdata->type) {
4062                         case IEEE80211_IF_TYPE_STA:
4063                                 if (!bssid)
4064                                         continue;
4065                                 if (!ieee80211_bssid_match(bssid,
4066                                                         sdata->u.sta.bssid)) {
4067                                         if (!rx.u.rx.in_scan)
4068                                                 continue;
4069                                         rx.u.rx.ra_match = 0;
4070                                 } else if (!multicast &&
4071                                            compare_ether_addr(sdata->dev->dev_addr,
4072                                                               hdr->addr1) != 0) {
4073                                         if (!sdata->promisc)
4074                                                 continue;
4075                                         rx.u.rx.ra_match = 0;
4076                                 }
4077                                 break;
4078                         case IEEE80211_IF_TYPE_IBSS:
4079                                 if (!bssid)
4080                                         continue;
4081                                 if (!ieee80211_bssid_match(bssid,
4082                                                         sdata->u.sta.bssid)) {
4083                                         if (!rx.u.rx.in_scan)
4084                                                 continue;
4085                                         rx.u.rx.ra_match = 0;
4086                                 } else if (!multicast &&
4087                                            compare_ether_addr(sdata->dev->dev_addr,
4088                                                               hdr->addr1) != 0) {
4089                                         if (!sdata->promisc)
4090                                                 continue;
4091                                         rx.u.rx.ra_match = 0;
4092                                 } else if (!sta)
4093                                         sta = rx.sta =
4094                                                 ieee80211_ibss_add_sta(sdata->dev,
4095                                                                        skb, bssid,
4096                                                                        hdr->addr2);
4097                                 break;
4098                         case IEEE80211_IF_TYPE_AP:
4099                                 if (!bssid) {
4100                                         if (compare_ether_addr(sdata->dev->dev_addr,
4101                                                                hdr->addr1) != 0)
4102                                                 continue;
4103                                 } else if (!ieee80211_bssid_match(bssid,
4104                                                         sdata->dev->dev_addr)) {
4105                                         if (!rx.u.rx.in_scan)
4106                                                 continue;
4107                                         rx.u.rx.ra_match = 0;
4108                                 }
4109                                 if (sdata->dev == local->mdev &&
4110                                     !rx.u.rx.in_scan)
4111                                         /* do not receive anything via
4112                                          * master device when not scanning */
4113                                         continue;
4114                                 break;
4115                         case IEEE80211_IF_TYPE_WDS:
4116                                 if (bssid ||
4117                                     (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
4118                                         continue;
4119                                 if (compare_ether_addr(sdata->u.wds.remote_addr,
4120                                                        hdr->addr2) != 0)
4121                                         continue;
4122                                 break;
4123                         }
4124
4125                         if (prev) {
4126                                 skb_new = skb_copy(skb, GFP_ATOMIC);
4127                                 if (!skb_new) {
4128                                         if (net_ratelimit())
4129                                                 printk(KERN_DEBUG "%s: failed to copy "
4130                                                        "multicast frame for %s",
4131                                                        local->mdev->name, prev->dev->name);
4132                                         continue;
4133                                 }
4134                                 rx.skb = skb_new;
4135                                 rx.dev = prev->dev;
4136                                 rx.sdata = prev;
4137                                 ieee80211_invoke_rx_handlers(local,
4138                                                              local->rx_handlers,
4139                                                              &rx, sta);
4140                         }
4141                         prev = sdata;
4142                 }
4143                 if (prev) {
4144                         rx.skb = skb;
4145                         rx.dev = prev->dev;
4146                         rx.sdata = prev;
4147                         ieee80211_invoke_rx_handlers(local, local->rx_handlers,
4148                                                      &rx, sta);
4149                 } else
4150                         dev_kfree_skb(skb);
4151                 read_unlock(&local->sub_if_lock);
4152         }
4153
4154   end:
4155         if (sta)
4156                 sta_info_put(sta);
4157 }
4158 EXPORT_SYMBOL(__ieee80211_rx);
4159
4160 static ieee80211_txrx_result
4161 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
4162 {
4163         struct ieee80211_local *local = tx->local;
4164         struct ieee80211_hw_mode *mode = tx->u.tx.mode;
4165         struct sk_buff *skb = tx->skb;
4166         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4167         u32 load = 0, hdrtime;
4168
4169         /* TODO: this could be part of tx_status handling, so that the number
4170          * of retries would be known; TX rate should in that case be stored
4171          * somewhere with the packet */
4172
4173         /* Estimate total channel use caused by this frame */
4174
4175         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4176          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4177
4178         if (mode->mode == MODE_IEEE80211A ||
4179             mode->mode == MODE_ATHEROS_TURBO ||
4180             mode->mode == MODE_ATHEROS_TURBOG ||
4181             (mode->mode == MODE_IEEE80211G &&
4182              tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
4183                 hdrtime = CHAN_UTIL_HDR_SHORT;
4184         else
4185                 hdrtime = CHAN_UTIL_HDR_LONG;
4186
4187         load = hdrtime;
4188         if (!is_multicast_ether_addr(hdr->addr1))
4189                 load += hdrtime;
4190
4191         if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
4192                 load += 2 * hdrtime;
4193         else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
4194                 load += hdrtime;
4195
4196         load += skb->len * tx->u.tx.rate->rate_inv;
4197
4198         if (tx->u.tx.extra_frag) {
4199                 int i;
4200                 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
4201                         load += 2 * hdrtime;
4202                         load += tx->u.tx.extra_frag[i]->len *
4203                                 tx->u.tx.rate->rate;
4204                 }
4205         }
4206
4207         /* Divide channel_use by 8 to avoid wrapping around the counter */
4208         load >>= CHAN_UTIL_SHIFT;
4209         local->channel_use_raw += load;
4210         if (tx->sta)
4211                 tx->sta->channel_use_raw += load;
4212         tx->sdata->channel_use_raw += load;
4213
4214         return TXRX_CONTINUE;
4215 }
4216
4217
4218 static ieee80211_txrx_result
4219 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
4220 {
4221         struct ieee80211_local *local = rx->local;
4222         struct sk_buff *skb = rx->skb;
4223         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4224         u32 load = 0, hdrtime;
4225         struct ieee80211_rate *rate;
4226         struct ieee80211_hw_mode *mode = local->hw.conf.mode;
4227         int i;
4228
4229         /* Estimate total channel use caused by this frame */
4230
4231         if (unlikely(mode->num_rates < 0))
4232                 return TXRX_CONTINUE;
4233
4234         rate = &mode->rates[0];
4235         for (i = 0; i < mode->num_rates; i++) {
4236                 if (mode->rates[i].val == rx->u.rx.status->rate) {
4237                         rate = &mode->rates[i];
4238                         break;
4239                 }
4240         }
4241
4242         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4243          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4244
4245         if (mode->mode == MODE_IEEE80211A ||
4246             mode->mode == MODE_ATHEROS_TURBO ||
4247             mode->mode == MODE_ATHEROS_TURBOG ||
4248             (mode->mode == MODE_IEEE80211G &&
4249              rate->flags & IEEE80211_RATE_ERP))
4250                 hdrtime = CHAN_UTIL_HDR_SHORT;
4251         else
4252                 hdrtime = CHAN_UTIL_HDR_LONG;
4253
4254         load = hdrtime;
4255         if (!is_multicast_ether_addr(hdr->addr1))
4256                 load += hdrtime;
4257
4258         load += skb->len * rate->rate_inv;
4259
4260         /* Divide channel_use by 8 to avoid wrapping around the counter */
4261         load >>= CHAN_UTIL_SHIFT;
4262         local->channel_use_raw += load;
4263         if (rx->sta)
4264                 rx->sta->channel_use_raw += load;
4265         rx->u.rx.load = load;
4266
4267         return TXRX_CONTINUE;
4268 }
4269
4270 static ieee80211_txrx_result
4271 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
4272 {
4273         rx->sdata->channel_use_raw += rx->u.rx.load;
4274         return TXRX_CONTINUE;
4275 }
4276
4277 static void ieee80211_stat_refresh(unsigned long data)
4278 {
4279         struct ieee80211_local *local = (struct ieee80211_local *) data;
4280         struct sta_info *sta;
4281         struct ieee80211_sub_if_data *sdata;
4282
4283         if (!local->stat_time)
4284                 return;
4285
4286         /* go through all stations */
4287         spin_lock_bh(&local->sta_lock);
4288         list_for_each_entry(sta, &local->sta_list, list) {
4289                 sta->channel_use = (sta->channel_use_raw / local->stat_time) /
4290                         CHAN_UTIL_PER_10MS;
4291                 sta->channel_use_raw = 0;
4292         }
4293         spin_unlock_bh(&local->sta_lock);
4294
4295         /* go through all subinterfaces */
4296         read_lock(&local->sub_if_lock);
4297         list_for_each_entry(sdata, &local->sub_if_list, list) {
4298                 sdata->channel_use = (sdata->channel_use_raw /
4299                                       local->stat_time) / CHAN_UTIL_PER_10MS;
4300                 sdata->channel_use_raw = 0;
4301         }
4302         read_unlock(&local->sub_if_lock);
4303
4304         /* hardware interface */
4305         local->channel_use = (local->channel_use_raw /
4306                               local->stat_time) / CHAN_UTIL_PER_10MS;
4307         local->channel_use_raw = 0;
4308
4309         local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
4310         add_timer(&local->stat_timer);
4311 }
4312
4313
4314 /* This is a version of the rx handler that can be called from hard irq
4315  * context. Post the skb on the queue and schedule the tasklet */
4316 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
4317                           struct ieee80211_rx_status *status)
4318 {
4319         struct ieee80211_local *local = hw_to_local(hw);
4320
4321         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4322
4323         skb->dev = local->mdev;
4324         /* copy status into skb->cb for use by tasklet */
4325         memcpy(skb->cb, status, sizeof(*status));
4326         skb->pkt_type = IEEE80211_RX_MSG;
4327         skb_queue_tail(&local->skb_queue, skb);
4328         tasklet_schedule(&local->tasklet);
4329 }
4330 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4331
4332 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
4333                                  struct sk_buff *skb,
4334                                  struct ieee80211_tx_status *status)
4335 {
4336         struct ieee80211_local *local = hw_to_local(hw);
4337         struct ieee80211_tx_status *saved;
4338         int tmp;
4339
4340         skb->dev = local->mdev;
4341         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
4342         if (unlikely(!saved)) {
4343                 if (net_ratelimit())
4344                         printk(KERN_WARNING "%s: Not enough memory, "
4345                                "dropping tx status", skb->dev->name);
4346                 /* should be dev_kfree_skb_irq, but due to this function being
4347                  * named _irqsafe instead of just _irq we can't be sure that
4348                  * people won't call it from non-irq contexts */
4349                 dev_kfree_skb_any(skb);
4350                 return;
4351         }
4352         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
4353         /* copy pointer to saved status into skb->cb for use by tasklet */
4354         memcpy(skb->cb, &saved, sizeof(saved));
4355
4356         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
4357         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
4358                        &local->skb_queue : &local->skb_queue_unreliable, skb);
4359         tmp = skb_queue_len(&local->skb_queue) +
4360                 skb_queue_len(&local->skb_queue_unreliable);
4361         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
4362                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4363                 memcpy(&saved, skb->cb, sizeof(saved));
4364                 kfree(saved);
4365                 dev_kfree_skb_irq(skb);
4366                 tmp--;
4367                 I802_DEBUG_INC(local->tx_status_drop);
4368         }
4369         tasklet_schedule(&local->tasklet);
4370 }
4371 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
4372
4373 static void ieee80211_tasklet_handler(unsigned long data)
4374 {
4375         struct ieee80211_local *local = (struct ieee80211_local *) data;
4376         struct sk_buff *skb;
4377         struct ieee80211_rx_status rx_status;
4378         struct ieee80211_tx_status *tx_status;
4379
4380         while ((skb = skb_dequeue(&local->skb_queue)) ||
4381                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4382                 switch (skb->pkt_type) {
4383                 case IEEE80211_RX_MSG:
4384                         /* status is in skb->cb */
4385                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
4386                         /* Clear skb->type in order to not confuse kernel
4387                          * netstack. */
4388                         skb->pkt_type = 0;
4389                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
4390                         break;
4391                 case IEEE80211_TX_STATUS_MSG:
4392                         /* get pointer to saved status out of skb->cb */
4393                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
4394                         skb->pkt_type = 0;
4395                         ieee80211_tx_status(local_to_hw(local),
4396                                             skb, tx_status);
4397                         kfree(tx_status);
4398                         break;
4399                 default: /* should never get here! */
4400                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
4401                                local->mdev->name, skb->pkt_type);
4402                         dev_kfree_skb(skb);
4403                         break;
4404                 }
4405         }
4406 }
4407
4408
4409 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
4410  * make a prepared TX frame (one that has been given to hw) to look like brand
4411  * new IEEE 802.11 frame that is ready to go through TX processing again.
4412  * Also, tx_packet_data in cb is restored from tx_control. */
4413 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
4414                                       struct ieee80211_key *key,
4415                                       struct sk_buff *skb,
4416                                       struct ieee80211_tx_control *control)
4417 {
4418         int hdrlen, iv_len, mic_len;
4419         struct ieee80211_tx_packet_data *pkt_data;
4420
4421         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
4422         pkt_data->ifindex = control->ifindex;
4423         pkt_data->mgmt_iface = (control->type == IEEE80211_IF_TYPE_MGMT);
4424         pkt_data->req_tx_status = !!(control->flags & IEEE80211_TXCTL_REQ_TX_STATUS);
4425         pkt_data->do_not_encrypt = !!(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT);
4426         pkt_data->requeue = !!(control->flags & IEEE80211_TXCTL_REQUEUE);
4427         pkt_data->queue = control->queue;
4428
4429         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
4430
4431         if (!key)
4432                 goto no_key;
4433
4434         switch (key->alg) {
4435         case ALG_WEP:
4436                 iv_len = WEP_IV_LEN;
4437                 mic_len = WEP_ICV_LEN;
4438                 break;
4439         case ALG_TKIP:
4440                 iv_len = TKIP_IV_LEN;
4441                 mic_len = TKIP_ICV_LEN;
4442                 break;
4443         case ALG_CCMP:
4444                 iv_len = CCMP_HDR_LEN;
4445                 mic_len = CCMP_MIC_LEN;
4446                 break;
4447         default:
4448                 goto no_key;
4449         }
4450
4451         if (skb->len >= mic_len && key->force_sw_encrypt)
4452                 skb_trim(skb, skb->len - mic_len);
4453         if (skb->len >= iv_len && skb->len > hdrlen) {
4454                 memmove(skb->data + iv_len, skb->data, hdrlen);
4455                 skb_pull(skb, iv_len);
4456         }
4457
4458 no_key:
4459         {
4460                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4461                 u16 fc = le16_to_cpu(hdr->frame_control);
4462                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
4463                         fc &= ~IEEE80211_STYPE_QOS_DATA;
4464                         hdr->frame_control = cpu_to_le16(fc);
4465                         memmove(skb->data + 2, skb->data, hdrlen - 2);
4466                         skb_pull(skb, 2);
4467                 }
4468         }
4469 }
4470
4471
4472 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
4473                          struct ieee80211_tx_status *status)
4474 {
4475         struct sk_buff *skb2;
4476         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4477         struct ieee80211_local *local = hw_to_local(hw);
4478         u16 frag, type;
4479         u32 msg_type;
4480         struct ieee80211_tx_status_rtap_hdr *rthdr;
4481         struct ieee80211_sub_if_data *sdata;
4482         int monitors;
4483
4484         if (!status) {
4485                 printk(KERN_ERR
4486                        "%s: ieee80211_tx_status called with NULL status\n",
4487                        local->mdev->name);
4488                 dev_kfree_skb(skb);
4489                 return;
4490         }
4491
4492         if (status->excessive_retries) {
4493                 struct sta_info *sta;
4494                 sta = sta_info_get(local, hdr->addr1);
4495                 if (sta) {
4496                         if (sta->flags & WLAN_STA_PS) {
4497                                 /* The STA is in power save mode, so assume
4498                                  * that this TX packet failed because of that.
4499                                  */
4500                                 status->excessive_retries = 0;
4501                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
4502                         }
4503                         sta_info_put(sta);
4504                 }
4505         }
4506
4507         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
4508                 struct sta_info *sta;
4509                 sta = sta_info_get(local, hdr->addr1);
4510                 if (sta) {
4511                         sta->tx_filtered_count++;
4512
4513                         /* Clear the TX filter mask for this STA when sending
4514                          * the next packet. If the STA went to power save mode,
4515                          * this will happen when it is waking up for the next
4516                          * time. */
4517                         sta->clear_dst_mask = 1;
4518
4519                         /* TODO: Is the WLAN_STA_PS flag always set here or is
4520                          * the race between RX and TX status causing some
4521                          * packets to be filtered out before 80211.o gets an
4522                          * update for PS status? This seems to be the case, so
4523                          * no changes are likely to be needed. */
4524                         if (sta->flags & WLAN_STA_PS &&
4525                             skb_queue_len(&sta->tx_filtered) <
4526                             STA_MAX_TX_BUFFER) {
4527                                 ieee80211_remove_tx_extra(local, sta->key,
4528                                                           skb,
4529                                                           &status->control);
4530                                 skb_queue_tail(&sta->tx_filtered, skb);
4531                         } else if (!(sta->flags & WLAN_STA_PS) &&
4532                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
4533                                 /* Software retry the packet once */
4534                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
4535                                 ieee80211_remove_tx_extra(local, sta->key,
4536                                                           skb,
4537                                                           &status->control);
4538                                 dev_queue_xmit(skb);
4539                         } else {
4540                                 if (net_ratelimit()) {
4541                                         printk(KERN_DEBUG "%s: dropped TX "
4542                                                "filtered frame queue_len=%d "
4543                                                "PS=%d @%lu\n",
4544                                                local->mdev->name,
4545                                                skb_queue_len(
4546                                                        &sta->tx_filtered),
4547                                                !!(sta->flags & WLAN_STA_PS),
4548                                                jiffies);
4549                                 }
4550                                 dev_kfree_skb(skb);
4551                         }
4552                         sta_info_put(sta);
4553                         return;
4554                 }
4555         } else {
4556                 /* FIXME: STUPID to call this with both local and local->mdev */
4557                 rate_control_tx_status(local, local->mdev, skb, status);
4558         }
4559
4560         ieee80211_led_tx(local, 0);
4561
4562         /* SNMP counters
4563          * Fragments are passed to low-level drivers as separate skbs, so these
4564          * are actually fragments, not frames. Update frame counters only for
4565          * the first fragment of the frame. */
4566
4567         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
4568         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
4569
4570         if (status->flags & IEEE80211_TX_STATUS_ACK) {
4571                 if (frag == 0) {
4572                         local->dot11TransmittedFrameCount++;
4573                         if (is_multicast_ether_addr(hdr->addr1))
4574                                 local->dot11MulticastTransmittedFrameCount++;
4575                         if (status->retry_count > 0)
4576                                 local->dot11RetryCount++;
4577                         if (status->retry_count > 1)
4578                                 local->dot11MultipleRetryCount++;
4579                 }
4580
4581                 /* This counter shall be incremented for an acknowledged MPDU
4582                  * with an individual address in the address 1 field or an MPDU
4583                  * with a multicast address in the address 1 field of type Data
4584                  * or Management. */
4585                 if (!is_multicast_ether_addr(hdr->addr1) ||
4586                     type == IEEE80211_FTYPE_DATA ||
4587                     type == IEEE80211_FTYPE_MGMT)
4588                         local->dot11TransmittedFragmentCount++;
4589         } else {
4590                 if (frag == 0)
4591                         local->dot11FailedCount++;
4592         }
4593
4594         msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
4595                 ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
4596
4597         /* this was a transmitted frame, but now we want to reuse it */
4598         skb_orphan(skb);
4599
4600         if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
4601             local->apdev) {
4602                 if (local->monitors) {
4603                         skb2 = skb_clone(skb, GFP_ATOMIC);
4604                 } else {
4605                         skb2 = skb;
4606                         skb = NULL;
4607                 }
4608
4609                 if (skb2)
4610                         /* Send frame to hostapd */
4611                         ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
4612
4613                 if (!skb)
4614                         return;
4615         }
4616
4617         if (!local->monitors) {
4618                 dev_kfree_skb(skb);
4619                 return;
4620         }
4621
4622         /* send frame to monitor interfaces now */
4623
4624         if (skb_headroom(skb) < sizeof(*rthdr)) {
4625                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
4626                 dev_kfree_skb(skb);
4627                 return;
4628         }
4629
4630         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
4631                                 skb_push(skb, sizeof(*rthdr));
4632
4633         memset(rthdr, 0, sizeof(*rthdr));
4634         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
4635         rthdr->hdr.it_present =
4636                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
4637                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
4638
4639         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
4640             !is_multicast_ether_addr(hdr->addr1))
4641                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
4642
4643         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
4644             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
4645                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
4646         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
4647                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
4648
4649         rthdr->data_retries = status->retry_count;
4650
4651         read_lock(&local->sub_if_lock);
4652         monitors = local->monitors;
4653         list_for_each_entry(sdata, &local->sub_if_list, list) {
4654                 /*
4655                  * Using the monitors counter is possibly racy, but
4656                  * if the value is wrong we simply either clone the skb
4657                  * once too much or forget sending it to one monitor iface
4658                  * The latter case isn't nice but fixing the race is much
4659                  * more complicated.
4660                  */
4661                 if (!monitors || !skb)
4662                         goto out;
4663
4664                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
4665                         if (!netif_running(sdata->dev))
4666                                 continue;
4667                         monitors--;
4668                         if (monitors)
4669                                 skb2 = skb_clone(skb, GFP_KERNEL);
4670                         else
4671                                 skb2 = NULL;
4672                         skb->dev = sdata->dev;
4673                         /* XXX: is this sufficient for BPF? */
4674                         skb_set_mac_header(skb, 0);
4675                         skb->ip_summed = CHECKSUM_UNNECESSARY;
4676                         skb->pkt_type = PACKET_OTHERHOST;
4677                         skb->protocol = htons(ETH_P_802_2);
4678                         memset(skb->cb, 0, sizeof(skb->cb));
4679                         netif_rx(skb);
4680                         skb = skb2;
4681                 }
4682         }
4683  out:
4684         read_unlock(&local->sub_if_lock);
4685         if (skb)
4686                 dev_kfree_skb(skb);
4687 }
4688 EXPORT_SYMBOL(ieee80211_tx_status);
4689
4690 /* TODO: implement register/unregister functions for adding TX/RX handlers
4691  * into ordered list */
4692
4693 /* rx_pre handlers don't have dev and sdata fields available in
4694  * ieee80211_txrx_data */
4695 static ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
4696 {
4697         ieee80211_rx_h_parse_qos,
4698         ieee80211_rx_h_load_stats,
4699         NULL
4700 };
4701
4702 static ieee80211_rx_handler ieee80211_rx_handlers[] =
4703 {
4704         ieee80211_rx_h_if_stats,
4705         ieee80211_rx_h_monitor,
4706         ieee80211_rx_h_passive_scan,
4707         ieee80211_rx_h_check,
4708         ieee80211_rx_h_sta_process,
4709         ieee80211_rx_h_ccmp_decrypt,
4710         ieee80211_rx_h_tkip_decrypt,
4711         ieee80211_rx_h_wep_weak_iv_detection,
4712         ieee80211_rx_h_wep_decrypt,
4713         ieee80211_rx_h_defragment,
4714         ieee80211_rx_h_ps_poll,
4715         ieee80211_rx_h_michael_mic_verify,
4716         /* this must be after decryption - so header is counted in MPDU mic
4717          * must be before pae and data, so QOS_DATA format frames
4718          * are not passed to user space by these functions
4719          */
4720         ieee80211_rx_h_remove_qos_control,
4721         ieee80211_rx_h_802_1x_pae,
4722         ieee80211_rx_h_drop_unencrypted,
4723         ieee80211_rx_h_data,
4724         ieee80211_rx_h_mgmt,
4725         NULL
4726 };
4727
4728 static ieee80211_tx_handler ieee80211_tx_handlers[] =
4729 {
4730         ieee80211_tx_h_check_assoc,
4731         ieee80211_tx_h_sequence,
4732         ieee80211_tx_h_ps_buf,
4733         ieee80211_tx_h_select_key,
4734         ieee80211_tx_h_michael_mic_add,
4735         ieee80211_tx_h_fragment,
4736         ieee80211_tx_h_tkip_encrypt,
4737         ieee80211_tx_h_ccmp_encrypt,
4738         ieee80211_tx_h_wep_encrypt,
4739         ieee80211_tx_h_rate_ctrl,
4740         ieee80211_tx_h_misc,
4741         ieee80211_tx_h_load_stats,
4742         NULL
4743 };
4744
4745
4746 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
4747 {
4748         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4749         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4750         struct sta_info *sta;
4751
4752         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
4753                 return 0;
4754
4755         /* Create STA entry for the new peer */
4756         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
4757         if (!sta)
4758                 return -ENOMEM;
4759         sta_info_put(sta);
4760
4761         /* Remove STA entry for the old peer */
4762         sta = sta_info_get(local, sdata->u.wds.remote_addr);
4763         if (sta) {
4764                 sta_info_put(sta);
4765                 sta_info_free(sta, 0);
4766         } else {
4767                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
4768                        "peer " MAC_FMT "\n",
4769                        dev->name, MAC_ARG(sdata->u.wds.remote_addr));
4770         }
4771
4772         /* Update WDS link data */
4773         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
4774
4775         return 0;
4776 }
4777
4778 /* Must not be called for mdev and apdev */
4779 void ieee80211_if_setup(struct net_device *dev)
4780 {
4781         ether_setup(dev);
4782         dev->hard_start_xmit = ieee80211_subif_start_xmit;
4783         dev->wireless_handlers = &ieee80211_iw_handler_def;
4784         dev->set_multicast_list = ieee80211_set_multicast_list;
4785         dev->change_mtu = ieee80211_change_mtu;
4786         dev->get_stats = ieee80211_get_stats;
4787         dev->open = ieee80211_open;
4788         dev->stop = ieee80211_stop;
4789         dev->uninit = ieee80211_if_reinit;
4790         dev->destructor = ieee80211_if_free;
4791 }
4792
4793 void ieee80211_if_mgmt_setup(struct net_device *dev)
4794 {
4795         ether_setup(dev);
4796         dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
4797         dev->change_mtu = ieee80211_change_mtu_apdev;
4798         dev->get_stats = ieee80211_get_stats;
4799         dev->open = ieee80211_mgmt_open;
4800         dev->stop = ieee80211_mgmt_stop;
4801         dev->type = ARPHRD_IEEE80211_PRISM;
4802         dev->hard_header_parse = header_parse_80211;
4803         dev->uninit = ieee80211_if_reinit;
4804         dev->destructor = ieee80211_if_free;
4805 }
4806
4807 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
4808                                  const char *name)
4809 {
4810         struct rate_control_ref *ref, *old;
4811
4812         ASSERT_RTNL();
4813         if (local->open_count || netif_running(local->mdev) ||
4814             (local->apdev && netif_running(local->apdev)))
4815                 return -EBUSY;
4816
4817         ref = rate_control_alloc(name, local);
4818         if (!ref) {
4819                 printk(KERN_WARNING "%s: Failed to select rate control "
4820                        "algorithm\n", local->mdev->name);
4821                 return -ENOENT;
4822         }
4823
4824         old = local->rate_ctrl;
4825         local->rate_ctrl = ref;
4826         if (old) {
4827                 rate_control_put(old);
4828                 sta_info_flush(local, NULL);
4829         }
4830
4831         printk(KERN_DEBUG "%s: Selected rate control "
4832                "algorithm '%s'\n", local->mdev->name,
4833                ref->ops->name);
4834
4835
4836         return 0;
4837 }
4838
4839 static void rate_control_deinitialize(struct ieee80211_local *local)
4840 {
4841         struct rate_control_ref *ref;
4842
4843         ref = local->rate_ctrl;
4844         local->rate_ctrl = NULL;
4845         rate_control_put(ref);
4846 }
4847
4848 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
4849                                         const struct ieee80211_ops *ops)
4850 {
4851         struct net_device *mdev;
4852         struct ieee80211_local *local;
4853         struct ieee80211_sub_if_data *sdata;
4854         int priv_size;
4855         struct wiphy *wiphy;
4856
4857         /* Ensure 32-byte alignment of our private data and hw private data.
4858          * We use the wiphy priv data for both our ieee80211_local and for
4859          * the driver's private data
4860          *
4861          * In memory it'll be like this:
4862          *
4863          * +-------------------------+
4864          * | struct wiphy           |
4865          * +-------------------------+
4866          * | struct ieee80211_local  |
4867          * +-------------------------+
4868          * | driver's private data   |
4869          * +-------------------------+
4870          *
4871          */
4872         priv_size = ((sizeof(struct ieee80211_local) +
4873                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
4874                     priv_data_len;
4875
4876         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
4877
4878         if (!wiphy)
4879                 return NULL;
4880
4881         wiphy->privid = mac80211_wiphy_privid;
4882
4883         local = wiphy_priv(wiphy);
4884         local->hw.wiphy = wiphy;
4885
4886         local->hw.priv = (char *)local +
4887                          ((sizeof(struct ieee80211_local) +
4888                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4889
4890         BUG_ON(!ops->tx);
4891         BUG_ON(!ops->config);
4892         BUG_ON(!ops->add_interface);
4893         local->ops = ops;
4894
4895         /* for now, mdev needs sub_if_data :/ */
4896         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
4897                             "wmaster%d", ether_setup);
4898         if (!mdev) {
4899                 wiphy_free(wiphy);
4900                 return NULL;
4901         }
4902
4903         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
4904         mdev->ieee80211_ptr = &sdata->wdev;
4905         sdata->wdev.wiphy = wiphy;
4906
4907         local->hw.queues = 1; /* default */
4908
4909         local->mdev = mdev;
4910         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
4911         local->rx_handlers = ieee80211_rx_handlers;
4912         local->tx_handlers = ieee80211_tx_handlers;
4913
4914         local->bridge_packets = 1;
4915
4916         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
4917         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
4918         local->short_retry_limit = 7;
4919         local->long_retry_limit = 4;
4920         local->hw.conf.radio_enabled = 1;
4921
4922         local->enabled_modes = (unsigned int) -1;
4923
4924         INIT_LIST_HEAD(&local->modes_list);
4925
4926         rwlock_init(&local->sub_if_lock);
4927         INIT_LIST_HEAD(&local->sub_if_list);
4928
4929         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
4930         init_timer(&local->stat_timer);
4931         local->stat_timer.function = ieee80211_stat_refresh;
4932         local->stat_timer.data = (unsigned long) local;
4933         ieee80211_rx_bss_list_init(mdev);
4934
4935         sta_info_init(local);
4936
4937         mdev->hard_start_xmit = ieee80211_master_start_xmit;
4938         mdev->open = ieee80211_master_open;
4939         mdev->stop = ieee80211_master_stop;
4940         mdev->type = ARPHRD_IEEE80211;
4941         mdev->hard_header_parse = header_parse_80211;
4942
4943         sdata->type = IEEE80211_IF_TYPE_AP;
4944         sdata->dev = mdev;
4945         sdata->local = local;
4946         sdata->u.ap.force_unicast_rateidx = -1;
4947         sdata->u.ap.max_ratectrl_rateidx = -1;
4948         ieee80211_if_sdata_init(sdata);
4949         list_add_tail(&sdata->list, &local->sub_if_list);
4950
4951         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
4952                      (unsigned long)local);
4953         tasklet_disable(&local->tx_pending_tasklet);
4954
4955         tasklet_init(&local->tasklet,
4956                      ieee80211_tasklet_handler,
4957                      (unsigned long) local);
4958         tasklet_disable(&local->tasklet);
4959
4960         skb_queue_head_init(&local->skb_queue);
4961         skb_queue_head_init(&local->skb_queue_unreliable);
4962
4963         return local_to_hw(local);
4964 }
4965 EXPORT_SYMBOL(ieee80211_alloc_hw);
4966
4967 int ieee80211_register_hw(struct ieee80211_hw *hw)
4968 {
4969         struct ieee80211_local *local = hw_to_local(hw);
4970         const char *name;
4971         int result;
4972
4973         result = wiphy_register(local->hw.wiphy);
4974         if (result < 0)
4975                 return result;
4976
4977         name = wiphy_dev(local->hw.wiphy)->driver->name;
4978         local->hw.workqueue = create_singlethread_workqueue(name);
4979         if (!local->hw.workqueue) {
4980                 result = -ENOMEM;
4981                 goto fail_workqueue;
4982         }
4983
4984         /*
4985          * The hardware needs headroom for sending the frame,
4986          * and we need some headroom for passing the frame to monitor
4987          * interfaces, but never both at the same time.
4988          */
4989         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
4990                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
4991
4992         debugfs_hw_add(local);
4993
4994         local->hw.conf.beacon_int = 1000;
4995
4996         local->wstats_flags |= local->hw.max_rssi ?
4997                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
4998         local->wstats_flags |= local->hw.max_signal ?
4999                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
5000         local->wstats_flags |= local->hw.max_noise ?
5001                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
5002         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
5003                 local->wstats_flags |= IW_QUAL_DBM;
5004
5005         result = sta_info_start(local);
5006         if (result < 0)
5007                 goto fail_sta_info;
5008
5009         rtnl_lock();
5010         result = dev_alloc_name(local->mdev, local->mdev->name);
5011         if (result < 0)
5012                 goto fail_dev;
5013
5014         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
5015         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
5016
5017         result = register_netdevice(local->mdev);
5018         if (result < 0)
5019                 goto fail_dev;
5020
5021         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5022
5023         result = ieee80211_init_rate_ctrl_alg(local, NULL);
5024         if (result < 0) {
5025                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
5026                        "algorithm\n", local->mdev->name);
5027                 goto fail_rate;
5028         }
5029
5030         result = ieee80211_wep_init(local);
5031
5032         if (result < 0) {
5033                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
5034                        local->mdev->name);
5035                 goto fail_wep;
5036         }
5037
5038         ieee80211_install_qdisc(local->mdev);
5039
5040         /* add one default STA interface */
5041         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
5042                                   IEEE80211_IF_TYPE_STA);
5043         if (result)
5044                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
5045                        local->mdev->name);
5046
5047         local->reg_state = IEEE80211_DEV_REGISTERED;
5048         rtnl_unlock();
5049
5050         ieee80211_led_init(local);
5051
5052         return 0;
5053
5054 fail_wep:
5055         rate_control_deinitialize(local);
5056 fail_rate:
5057         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5058         unregister_netdevice(local->mdev);
5059 fail_dev:
5060         rtnl_unlock();
5061         sta_info_stop(local);
5062 fail_sta_info:
5063         debugfs_hw_del(local);
5064         destroy_workqueue(local->hw.workqueue);
5065 fail_workqueue:
5066         wiphy_unregister(local->hw.wiphy);
5067         return result;
5068 }
5069 EXPORT_SYMBOL(ieee80211_register_hw);
5070
5071 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
5072                               struct ieee80211_hw_mode *mode)
5073 {
5074         struct ieee80211_local *local = hw_to_local(hw);
5075         struct ieee80211_rate *rate;
5076         int i;
5077
5078         INIT_LIST_HEAD(&mode->list);
5079         list_add_tail(&mode->list, &local->modes_list);
5080
5081         local->hw_modes |= (1 << mode->mode);
5082         for (i = 0; i < mode->num_rates; i++) {
5083                 rate = &(mode->rates[i]);
5084                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
5085         }
5086         ieee80211_prepare_rates(local, mode);
5087
5088         if (!local->oper_hw_mode) {
5089                 /* Default to this mode */
5090                 local->hw.conf.phymode = mode->mode;
5091                 local->oper_hw_mode = local->scan_hw_mode = mode;
5092                 local->oper_channel = local->scan_channel = &mode->channels[0];
5093                 local->hw.conf.mode = local->oper_hw_mode;
5094                 local->hw.conf.chan = local->oper_channel;
5095         }
5096
5097         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
5098                 ieee80211_set_default_regdomain(mode);
5099
5100         return 0;
5101 }
5102 EXPORT_SYMBOL(ieee80211_register_hwmode);
5103
5104 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
5105 {
5106         struct ieee80211_local *local = hw_to_local(hw);
5107         struct ieee80211_sub_if_data *sdata, *tmp;
5108         struct list_head tmp_list;
5109         int i;
5110
5111         tasklet_kill(&local->tx_pending_tasklet);
5112         tasklet_kill(&local->tasklet);
5113
5114         rtnl_lock();
5115
5116         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
5117
5118         local->reg_state = IEEE80211_DEV_UNREGISTERED;
5119         if (local->apdev)
5120                 ieee80211_if_del_mgmt(local);
5121
5122         write_lock_bh(&local->sub_if_lock);
5123         list_replace_init(&local->sub_if_list, &tmp_list);
5124         write_unlock_bh(&local->sub_if_lock);
5125
5126         list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
5127                 __ieee80211_if_del(local, sdata);
5128
5129         rtnl_unlock();
5130
5131         if (local->stat_time)
5132                 del_timer_sync(&local->stat_timer);
5133
5134         ieee80211_rx_bss_list_deinit(local->mdev);
5135         ieee80211_clear_tx_pending(local);
5136         sta_info_stop(local);
5137         rate_control_deinitialize(local);
5138         debugfs_hw_del(local);
5139
5140         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
5141                 kfree(local->supp_rates[i]);
5142                 kfree(local->basic_rates[i]);
5143         }
5144
5145         if (skb_queue_len(&local->skb_queue)
5146                         || skb_queue_len(&local->skb_queue_unreliable))
5147                 printk(KERN_WARNING "%s: skb_queue not empty\n",
5148                        local->mdev->name);
5149         skb_queue_purge(&local->skb_queue);
5150         skb_queue_purge(&local->skb_queue_unreliable);
5151
5152         destroy_workqueue(local->hw.workqueue);
5153         wiphy_unregister(local->hw.wiphy);
5154         ieee80211_wep_free(local);
5155         ieee80211_led_exit(local);
5156 }
5157 EXPORT_SYMBOL(ieee80211_unregister_hw);
5158
5159 void ieee80211_free_hw(struct ieee80211_hw *hw)
5160 {
5161         struct ieee80211_local *local = hw_to_local(hw);
5162
5163         ieee80211_if_free(local->mdev);
5164         wiphy_free(local->hw.wiphy);
5165 }
5166 EXPORT_SYMBOL(ieee80211_free_hw);
5167
5168 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
5169 {
5170         struct ieee80211_local *local = hw_to_local(hw);
5171
5172         if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
5173                                &local->state[queue])) {
5174                 if (test_bit(IEEE80211_LINK_STATE_PENDING,
5175                              &local->state[queue]))
5176                         tasklet_schedule(&local->tx_pending_tasklet);
5177                 else
5178                         if (!ieee80211_qdisc_installed(local->mdev)) {
5179                                 if (queue == 0)
5180                                         netif_wake_queue(local->mdev);
5181                         } else
5182                                 __netif_schedule(local->mdev);
5183         }
5184 }
5185 EXPORT_SYMBOL(ieee80211_wake_queue);
5186
5187 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
5188 {
5189         struct ieee80211_local *local = hw_to_local(hw);
5190
5191         if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
5192                 netif_stop_queue(local->mdev);
5193         set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
5194 }
5195 EXPORT_SYMBOL(ieee80211_stop_queue);
5196
5197 void ieee80211_start_queues(struct ieee80211_hw *hw)
5198 {
5199         struct ieee80211_local *local = hw_to_local(hw);
5200         int i;
5201
5202         for (i = 0; i < local->hw.queues; i++)
5203                 clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
5204         if (!ieee80211_qdisc_installed(local->mdev))
5205                 netif_start_queue(local->mdev);
5206 }
5207 EXPORT_SYMBOL(ieee80211_start_queues);
5208
5209 void ieee80211_stop_queues(struct ieee80211_hw *hw)
5210 {
5211         int i;
5212
5213         for (i = 0; i < hw->queues; i++)
5214                 ieee80211_stop_queue(hw, i);
5215 }
5216 EXPORT_SYMBOL(ieee80211_stop_queues);
5217
5218 void ieee80211_wake_queues(struct ieee80211_hw *hw)
5219 {
5220         int i;
5221
5222         for (i = 0; i < hw->queues; i++)
5223                 ieee80211_wake_queue(hw, i);
5224 }
5225 EXPORT_SYMBOL(ieee80211_wake_queues);
5226
5227 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
5228 {
5229         struct ieee80211_sub_if_data *sdata;
5230         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5231         return &sdata->stats;
5232 }
5233
5234 static int __init ieee80211_init(void)
5235 {
5236         struct sk_buff *skb;
5237         int ret;
5238
5239         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
5240
5241         ret = ieee80211_wme_register();
5242         if (ret) {
5243                 printk(KERN_DEBUG "ieee80211_init: failed to "
5244                        "initialize WME (err=%d)\n", ret);
5245                 return ret;
5246         }
5247
5248         ieee80211_debugfs_netdev_init();
5249         ieee80211_regdomain_init();
5250
5251         return 0;
5252 }
5253
5254
5255 static void __exit ieee80211_exit(void)
5256 {
5257         ieee80211_wme_unregister();
5258         ieee80211_debugfs_netdev_exit();
5259 }
5260
5261
5262 subsys_initcall(ieee80211_init);
5263 module_exit(ieee80211_exit);
5264
5265 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
5266 MODULE_LICENSE("GPL");