git.oblomov.eu Git - linux-2.6/blob - 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->local->cts_protect_erp_frames && 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 &&
 872             tx->local->cts_protect_erp_frames &&
 873             !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
 874                 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
 875
 876         /* Setup duration field for the first fragment of the frame. Duration
 877          * for remaining fragments will be updated when they are being sent
 878          * to low-level driver in ieee80211_tx(). */
 879         dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
 880                                  tx->fragmented ? tx->u.tx.extra_frag[0]->len :
 881                                  0);
 882         hdr->duration_id = cpu_to_le16(dur);
 883
 884         if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
 885             (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
 886                 struct ieee80211_rate *rate;
 887
 888                 /* Do not use multiple retry rates when using RTS/CTS */
 889                 control->alt_retry_rate = -1;
 890
 891                 /* Use min(data rate, max base rate) as CTS/RTS rate */
 892                 rate = tx->u.tx.rate;
 893                 while (rate > mode->rates &&
 894                        !(rate->flags & IEEE80211_RATE_BASIC))
 895                         rate--;
 896
 897                 control->rts_cts_rate = rate->val;
 898                 control->rts_rate = rate;
 899         }
 900
 901         if (tx->sta) {
 902                 tx->sta->tx_packets++;
 903                 tx->sta->tx_fragments++;
 904                 tx->sta->tx_bytes += tx->skb->len;
 905                 if (tx->u.tx.extra_frag) {
 906                         int i;
 907                         tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
 908                         for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
 909                                 tx->sta->tx_bytes +=
 910                                         tx->u.tx.extra_frag[i]->len;
 911                         }
 912                 }
 913         }
 914
 915         return TXRX_CONTINUE;
 916 }
 917
 918
 919 static ieee80211_txrx_result
 920 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
 921 {
 922 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 923         struct sk_buff *skb = tx->skb;
 924         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 925 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 926         u32 sta_flags;
 927
 928         if (unlikely(tx->local->sta_scanning != 0) &&
 929             ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
 930              (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
 931                 return TXRX_DROP;
 932
 933         if (tx->u.tx.ps_buffered)
 934                 return TXRX_CONTINUE;
 935
 936         sta_flags = tx->sta ? tx->sta->flags : 0;
 937
 938         if (likely(tx->u.tx.unicast)) {
 939                 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
 940                              tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
 941                              (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
 942 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 943                         printk(KERN_DEBUG "%s: dropped data frame to not "
 944                                "associated station " MAC_FMT "\n",
 945                                tx->dev->name, MAC_ARG(hdr->addr1));
 946 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 947                         I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
 948                         return TXRX_DROP;
 949                 }
 950         } else {
 951                 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
 952                              tx->local->num_sta == 0 &&
 953                              !tx->local->allow_broadcast_always &&
 954                              tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
 955                         /*
 956                          * No associated STAs - no need to send multicast
 957                          * frames.
 958                          */
 959                         return TXRX_DROP;
 960                 }
 961                 return TXRX_CONTINUE;
 962         }
 963
 964         if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
 965                      !(sta_flags & WLAN_STA_AUTHORIZED))) {
 966 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 967                 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
 968                        " (unauthorized port)\n", tx->dev->name,
 969                        MAC_ARG(hdr->addr1));
 970 #endif
 971                 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
 972                 return TXRX_DROP;
 973         }
 974
 975         return TXRX_CONTINUE;
 976 }
 977
 978 static ieee80211_txrx_result
 979 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
 980 {
 981         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 982
 983         if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
 984                 ieee80211_include_sequence(tx->sdata, hdr);
 985
 986         return TXRX_CONTINUE;
 987 }
 988
 989 /* This function is called whenever the AP is about to exceed the maximum limit
 990  * of buffered frames for power saving STAs. This situation should not really
 991  * happen often during normal operation, so dropping the oldest buffered packet
 992  * from each queue should be OK to make some room for new frames. */
 993 static void purge_old_ps_buffers(struct ieee80211_local *local)
 994 {
 995         int total = 0, purged = 0;
 996         struct sk_buff *skb;
 997         struct ieee80211_sub_if_data *sdata;
 998         struct sta_info *sta;
 999
1000         read_lock(&local->sub_if_lock);
1001         list_for_each_entry(sdata, &local->sub_if_list, list) {
1002                 struct ieee80211_if_ap *ap;
1003                 if (sdata->dev == local->mdev ||
1004                     sdata->type != IEEE80211_IF_TYPE_AP)
1005                         continue;
1006                 ap = &sdata->u.ap;
1007                 skb = skb_dequeue(&ap->ps_bc_buf);
1008                 if (skb) {
1009                         purged++;
1010                         dev_kfree_skb(skb);
1011                 }
1012                 total += skb_queue_len(&ap->ps_bc_buf);
1013         }
1014         read_unlock(&local->sub_if_lock);
1015
1016         spin_lock_bh(&local->sta_lock);
1017         list_for_each_entry(sta, &local->sta_list, list) {
1018                 skb = skb_dequeue(&sta->ps_tx_buf);
1019                 if (skb) {
1020                         purged++;
1021                         dev_kfree_skb(skb);
1022                 }
1023                 total += skb_queue_len(&sta->ps_tx_buf);
1024         }
1025         spin_unlock_bh(&local->sta_lock);
1026
1027         local->total_ps_buffered = total;
1028         printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
1029                local->mdev->name, purged);
1030 }
1031
1032
1033 static inline ieee80211_txrx_result
1034 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
1035 {
1036         /* broadcast/multicast frame */
1037         /* If any of the associated stations is in power save mode,
1038          * the frame is buffered to be sent after DTIM beacon frame */
1039         if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
1040             tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
1041             tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
1042             !(tx->fc & IEEE80211_FCTL_ORDER)) {
1043                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1044                         purge_old_ps_buffers(tx->local);
1045                 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
1046                     AP_MAX_BC_BUFFER) {
1047                         if (net_ratelimit()) {
1048                                 printk(KERN_DEBUG "%s: BC TX buffer full - "
1049                                        "dropping the oldest frame\n",
1050                                        tx->dev->name);
1051                         }
1052                         dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
1053                 } else
1054                         tx->local->total_ps_buffered++;
1055                 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
1056                 return TXRX_QUEUED;
1057         }
1058
1059         return TXRX_CONTINUE;
1060 }
1061
1062
1063 static inline ieee80211_txrx_result
1064 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
1065 {
1066         struct sta_info *sta = tx->sta;
1067
1068         if (unlikely(!sta ||
1069                      ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1070                       (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
1071                 return TXRX_CONTINUE;
1072
1073         if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
1074                 struct ieee80211_tx_packet_data *pkt_data;
1075 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1076                 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
1077                        "before %d)\n",
1078                        MAC_ARG(sta->addr), sta->aid,
1079                        skb_queue_len(&sta->ps_tx_buf));
1080 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1081                 sta->flags |= WLAN_STA_TIM;
1082                 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1083                         purge_old_ps_buffers(tx->local);
1084                 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
1085                         struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
1086                         if (net_ratelimit()) {
1087                                 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
1088                                        "buffer full - dropping oldest frame\n",
1089                                        tx->dev->name, MAC_ARG(sta->addr));
1090                         }
1091                         dev_kfree_skb(old);
1092                 } else
1093                         tx->local->total_ps_buffered++;
1094                 /* Queue frame to be sent after STA sends an PS Poll frame */
1095                 if (skb_queue_empty(&sta->ps_tx_buf)) {
1096                         if (tx->local->ops->set_tim)
1097                                 tx->local->ops->set_tim(local_to_hw(tx->local),
1098                                                        sta->aid, 1);
1099                         if (tx->sdata->bss)
1100                                 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
1101                 }
1102                 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
1103                 pkt_data->jiffies = jiffies;
1104                 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
1105                 return TXRX_QUEUED;
1106         }
1107 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1108         else if (unlikely(sta->flags & WLAN_STA_PS)) {
1109                 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
1110                        "set -> send frame\n", tx->dev->name,
1111                        MAC_ARG(sta->addr));
1112         }
1113 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1114         sta->pspoll = 0;
1115
1116         return TXRX_CONTINUE;
1117 }
1118
1119
1120 static ieee80211_txrx_result
1121 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
1122 {
1123         if (unlikely(tx->u.tx.ps_buffered))
1124                 return TXRX_CONTINUE;
1125
1126         if (tx->u.tx.unicast)
1127                 return ieee80211_tx_h_unicast_ps_buf(tx);
1128         else
1129                 return ieee80211_tx_h_multicast_ps_buf(tx);
1130 }
1131
1132
1133 /*
1134  * deal with packet injection down monitor interface
1135  * with Radiotap Header -- only called for monitor mode interface
1136  */
1137
1138 static ieee80211_txrx_result
1139 __ieee80211_parse_tx_radiotap(
1140         struct ieee80211_txrx_data *tx,
1141         struct sk_buff *skb, struct ieee80211_tx_control *control)
1142 {
1143         /*
1144          * this is the moment to interpret and discard the radiotap header that
1145          * must be at the start of the packet injected in Monitor mode
1146          *
1147          * Need to take some care with endian-ness since radiotap
1148          * args are little-endian
1149          */
1150
1151         struct ieee80211_radiotap_iterator iterator;
1152         struct ieee80211_radiotap_header *rthdr =
1153                 (struct ieee80211_radiotap_header *) skb->data;
1154         struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
1155         int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
1156
1157         /*
1158          * default control situation for all injected packets
1159          * FIXME: this does not suit all usage cases, expand to allow control
1160          */
1161
1162         control->retry_limit = 1; /* no retry */
1163         control->key_idx = -1; /* no encryption key */
1164         control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1165                             IEEE80211_TXCTL_USE_CTS_PROTECT);
1166         control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
1167                           IEEE80211_TXCTL_NO_ACK;
1168         control->antenna_sel_tx = 0; /* default to default antenna */
1169
1170         /*
1171          * for every radiotap entry that is present
1172          * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1173          * entries present, or -EINVAL on error)
1174          */
1175
1176         while (!ret) {
1177                 int i, target_rate;
1178
1179                 ret = ieee80211_radiotap_iterator_next(&iterator);
1180
1181                 if (ret)
1182                         continue;
1183
1184                 /* see if this argument is something we can use */
1185                 switch (iterator.this_arg_index) {
1186                 /*
1187                  * You must take care when dereferencing iterator.this_arg
1188                  * for multibyte types... the pointer is not aligned.  Use
1189                  * get_unaligned((type *)iterator.this_arg) to dereference
1190                  * iterator.this_arg for type "type" safely on all arches.
1191                 */
1192                 case IEEE80211_RADIOTAP_RATE:
1193                         /*
1194                          * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
1195                          * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
1196                          */
1197                         target_rate = (*iterator.this_arg) * 5;
1198                         for (i = 0; i < mode->num_rates; i++) {
1199                                 struct ieee80211_rate *r = &mode->rates[i];
1200
1201                                 if (r->rate > target_rate)
1202                                         continue;
1203
1204                                 control->rate = r;
1205
1206                                 if (r->flags & IEEE80211_RATE_PREAMBLE2)
1207                                         control->tx_rate = r->val2;
1208                                 else
1209                                         control->tx_rate = r->val;
1210
1211                                 /* end on exact match */
1212                                 if (r->rate == target_rate)
1213                                         i = mode->num_rates;
1214                         }
1215                         break;
1216
1217                 case IEEE80211_RADIOTAP_ANTENNA:
1218                         /*
1219                          * radiotap uses 0 for 1st ant, mac80211 is 1 for
1220                          * 1st ant
1221                          */
1222                         control->antenna_sel_tx = (*iterator.this_arg) + 1;
1223                         break;
1224
1225                 case IEEE80211_RADIOTAP_DBM_TX_POWER:
1226                         control->power_level = *iterator.this_arg;
1227                         break;
1228
1229                 case IEEE80211_RADIOTAP_FLAGS:
1230                         if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1231                                 /*
1232                                  * this indicates that the skb we have been
1233                                  * handed has the 32-bit FCS CRC at the end...
1234                                  * we should react to that by snipping it off
1235                                  * because it will be recomputed and added
1236                                  * on transmission
1237                                  */
1238                                 if (skb->len < (iterator.max_length + FCS_LEN))
1239                                         return TXRX_DROP;
1240
1241                                 skb_trim(skb, skb->len - FCS_LEN);
1242                         }
1243                         break;
1244
1245                 default:
1246                         break;
1247                 }
1248         }
1249
1250         if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1251                 return TXRX_DROP;
1252
1253         /*
1254          * remove the radiotap header
1255          * iterator->max_length was sanity-checked against
1256          * skb->len by iterator init
1257          */
1258         skb_pull(skb, iterator.max_length);
1259
1260         return TXRX_CONTINUE;
1261 }
1262
1263
1264 static ieee80211_txrx_result inline
1265 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1266                        struct sk_buff *skb,
1267                        struct net_device *dev,
1268                        struct ieee80211_tx_control *control)
1269 {
1270         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1271         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1272         struct ieee80211_sub_if_data *sdata;
1273         ieee80211_txrx_result res = TXRX_CONTINUE;
1274
1275         int hdrlen;
1276
1277         memset(tx, 0, sizeof(*tx));
1278         tx->skb = skb;
1279         tx->dev = dev; /* use original interface */
1280         tx->local = local;
1281         tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1282         tx->sta = sta_info_get(local, hdr->addr1);
1283         tx->fc = le16_to_cpu(hdr->frame_control);
1284
1285         /*
1286          * set defaults for things that can be set by
1287          * injected radiotap headers
1288          */
1289         control->power_level = local->hw.conf.power_level;
1290         control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1291         if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
1292                 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
1293
1294         /* process and remove the injection radiotap header */
1295         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1296         if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
1297                 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
1298                                                                 TXRX_DROP) {
1299                         return TXRX_DROP;
1300                 }
1301                 /*
1302                  * we removed the radiotap header after this point,
1303                  * we filled control with what we could use
1304                  * set to the actual ieee header now
1305                  */
1306                 hdr = (struct ieee80211_hdr *) skb->data;
1307                 res = TXRX_QUEUED; /* indication it was monitor packet */
1308         }
1309
1310         tx->u.tx.control = control;
1311         tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
1312         if (is_multicast_ether_addr(hdr->addr1))
1313                 control->flags |= IEEE80211_TXCTL_NO_ACK;
1314         else
1315                 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1316         tx->fragmented = local->fragmentation_threshold <
1317                 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
1318                 skb->len + FCS_LEN > local->fragmentation_threshold &&
1319                 (!local->ops->set_frag_threshold);
1320         if (!tx->sta)
1321                 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1322         else if (tx->sta->clear_dst_mask) {
1323                 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1324                 tx->sta->clear_dst_mask = 0;
1325         }
1326         hdrlen = ieee80211_get_hdrlen(tx->fc);
1327         if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1328                 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1329                 tx->ethertype = (pos[0] << 8) | pos[1];
1330         }
1331         control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1332
1333         return res;
1334 }
1335
1336 static int inline is_ieee80211_device(struct net_device *dev,
1337                                       struct net_device *master)
1338 {
1339         return (wdev_priv(dev->ieee80211_ptr) ==
1340                 wdev_priv(master->ieee80211_ptr));
1341 }
1342
1343 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1344  * finished with it. */
1345 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1346                                        struct sk_buff *skb,
1347                                        struct net_device *mdev,
1348                                        struct ieee80211_tx_control *control)
1349 {
1350         struct ieee80211_tx_packet_data *pkt_data;
1351         struct net_device *dev;
1352
1353         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1354         dev = dev_get_by_index(pkt_data->ifindex);
1355         if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1356                 dev_put(dev);
1357                 dev = NULL;
1358         }
1359         if (unlikely(!dev))
1360                 return -ENODEV;
1361         __ieee80211_tx_prepare(tx, skb, dev, control);
1362         return 0;
1363 }
1364
1365 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
1366                                             int queue)
1367 {
1368         return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
1369 }
1370
1371 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
1372                                             int queue)
1373 {
1374         return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
1375 }
1376
1377 #define IEEE80211_TX_OK         0
1378 #define IEEE80211_TX_AGAIN      1
1379 #define IEEE80211_TX_FRAG_AGAIN 2
1380
1381 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1382                           struct ieee80211_txrx_data *tx)
1383 {
1384         struct ieee80211_tx_control *control = tx->u.tx.control;
1385         int ret, i;
1386
1387         if (!ieee80211_qdisc_installed(local->mdev) &&
1388             __ieee80211_queue_stopped(local, 0)) {
1389                 netif_stop_queue(local->mdev);
1390                 return IEEE80211_TX_AGAIN;
1391         }
1392         if (skb) {
1393                 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1394                 ret = local->ops->tx(local_to_hw(local), skb, control);
1395                 if (ret)
1396                         return IEEE80211_TX_AGAIN;
1397                 local->mdev->trans_start = jiffies;
1398                 ieee80211_led_tx(local, 1);
1399         }
1400         if (tx->u.tx.extra_frag) {
1401                 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1402                                     IEEE80211_TXCTL_USE_CTS_PROTECT |
1403                                     IEEE80211_TXCTL_CLEAR_DST_MASK |
1404                                     IEEE80211_TXCTL_FIRST_FRAGMENT);
1405                 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1406                         if (!tx->u.tx.extra_frag[i])
1407                                 continue;
1408                         if (__ieee80211_queue_stopped(local, control->queue))
1409                                 return IEEE80211_TX_FRAG_AGAIN;
1410                         if (i == tx->u.tx.num_extra_frag) {
1411                                 control->tx_rate = tx->u.tx.last_frag_hwrate;
1412                                 control->rate = tx->u.tx.last_frag_rate;
1413                                 if (tx->u.tx.probe_last_frag)
1414                                         control->flags |=
1415                                                 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1416                                 else
1417                                         control->flags &=
1418                                                 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1419                         }
1420
1421                         ieee80211_dump_frame(local->mdev->name,
1422                                              "TX to low-level driver",
1423                                              tx->u.tx.extra_frag[i]);
1424                         ret = local->ops->tx(local_to_hw(local),
1425                                             tx->u.tx.extra_frag[i],
1426                                             control);
1427                         if (ret)
1428                                 return IEEE80211_TX_FRAG_AGAIN;
1429                         local->mdev->trans_start = jiffies;
1430                         ieee80211_led_tx(local, 1);
1431                         tx->u.tx.extra_frag[i] = NULL;
1432                 }
1433                 kfree(tx->u.tx.extra_frag);
1434                 tx->u.tx.extra_frag = NULL;
1435         }
1436         return IEEE80211_TX_OK;
1437 }
1438
1439 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1440                         struct ieee80211_tx_control *control, int mgmt)
1441 {
1442         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1443         struct sta_info *sta;
1444         ieee80211_tx_handler *handler;
1445         struct ieee80211_txrx_data tx;
1446         ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1447         int ret, i;
1448
1449         WARN_ON(__ieee80211_queue_pending(local, control->queue));
1450
1451         if (unlikely(skb->len < 10)) {
1452                 dev_kfree_skb(skb);
1453                 return 0;
1454         }
1455
1456         res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1457
1458         if (res_prepare == TXRX_DROP) {
1459                 dev_kfree_skb(skb);
1460                 return 0;
1461         }
1462
1463         sta = tx.sta;
1464         tx.u.tx.mgmt_interface = mgmt;
1465         tx.u.tx.mode = local->hw.conf.mode;
1466
1467         if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1468                 res = TXRX_CONTINUE;
1469         } else {
1470                 for (handler = local->tx_handlers; *handler != NULL;
1471                      handler++) {
1472                         res = (*handler)(&tx);
1473                         if (res != TXRX_CONTINUE)
1474                                 break;
1475                 }
1476         }
1477
1478         skb = tx.skb; /* handlers are allowed to change skb */
1479
1480         if (sta)
1481                 sta_info_put(sta);
1482
1483         if (unlikely(res == TXRX_DROP)) {
1484                 I802_DEBUG_INC(local->tx_handlers_drop);
1485                 goto drop;
1486         }
1487
1488         if (unlikely(res == TXRX_QUEUED)) {
1489                 I802_DEBUG_INC(local->tx_handlers_queued);
1490                 return 0;
1491         }
1492
1493         if (tx.u.tx.extra_frag) {
1494                 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1495                         int next_len, dur;
1496                         struct ieee80211_hdr *hdr =
1497                                 (struct ieee80211_hdr *)
1498                                 tx.u.tx.extra_frag[i]->data;
1499
1500                         if (i + 1 < tx.u.tx.num_extra_frag) {
1501                                 next_len = tx.u.tx.extra_frag[i + 1]->len;
1502                         } else {
1503                                 next_len = 0;
1504                                 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1505                                 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1506                         }
1507                         dur = ieee80211_duration(&tx, 0, next_len);
1508                         hdr->duration_id = cpu_to_le16(dur);
1509                 }
1510         }
1511
1512 retry:
1513         ret = __ieee80211_tx(local, skb, &tx);
1514         if (ret) {
1515                 struct ieee80211_tx_stored_packet *store =
1516                         &local->pending_packet[control->queue];
1517
1518                 if (ret == IEEE80211_TX_FRAG_AGAIN)
1519                         skb = NULL;
1520                 set_bit(IEEE80211_LINK_STATE_PENDING,
1521                         &local->state[control->queue]);
1522                 smp_mb();
1523                 /* When the driver gets out of buffers during sending of
1524                  * fragments and calls ieee80211_stop_queue, there is
1525                  * a small window between IEEE80211_LINK_STATE_XOFF and
1526                  * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1527                  * gets available in that window (i.e. driver calls
1528                  * ieee80211_wake_queue), we would end up with ieee80211_tx
1529                  * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1530                  * continuing transmitting here when that situation is
1531                  * possible to have happened. */
1532                 if (!__ieee80211_queue_stopped(local, control->queue)) {
1533                         clear_bit(IEEE80211_LINK_STATE_PENDING,
1534                                   &local->state[control->queue]);
1535                         goto retry;
1536                 }
1537                 memcpy(&store->control, control,
1538                        sizeof(struct ieee80211_tx_control));
1539                 store->skb = skb;
1540                 store->extra_frag = tx.u.tx.extra_frag;
1541                 store->num_extra_frag = tx.u.tx.num_extra_frag;
1542                 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1543                 store->last_frag_rate = tx.u.tx.last_frag_rate;
1544                 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1545         }
1546         return 0;
1547
1548  drop:
1549         if (skb)
1550                 dev_kfree_skb(skb);
1551         for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1552                 if (tx.u.tx.extra_frag[i])
1553                         dev_kfree_skb(tx.u.tx.extra_frag[i]);
1554         kfree(tx.u.tx.extra_frag);
1555         return 0;
1556 }
1557
1558 static void ieee80211_tx_pending(unsigned long data)
1559 {
1560         struct ieee80211_local *local = (struct ieee80211_local *)data;
1561         struct net_device *dev = local->mdev;
1562         struct ieee80211_tx_stored_packet *store;
1563         struct ieee80211_txrx_data tx;
1564         int i, ret, reschedule = 0;
1565
1566         netif_tx_lock_bh(dev);
1567         for (i = 0; i < local->hw.queues; i++) {
1568                 if (__ieee80211_queue_stopped(local, i))
1569                         continue;
1570                 if (!__ieee80211_queue_pending(local, i)) {
1571                         reschedule = 1;
1572                         continue;
1573                 }
1574                 store = &local->pending_packet[i];
1575                 tx.u.tx.control = &store->control;
1576                 tx.u.tx.extra_frag = store->extra_frag;
1577                 tx.u.tx.num_extra_frag = store->num_extra_frag;
1578                 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1579                 tx.u.tx.last_frag_rate = store->last_frag_rate;
1580                 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1581                 ret = __ieee80211_tx(local, store->skb, &tx);
1582                 if (ret) {
1583                         if (ret == IEEE80211_TX_FRAG_AGAIN)
1584                                 store->skb = NULL;
1585                 } else {
1586                         clear_bit(IEEE80211_LINK_STATE_PENDING,
1587                                   &local->state[i]);
1588                         reschedule = 1;
1589                 }
1590         }
1591         netif_tx_unlock_bh(dev);
1592         if (reschedule) {
1593                 if (!ieee80211_qdisc_installed(dev)) {
1594                         if (!__ieee80211_queue_stopped(local, 0))
1595                                 netif_wake_queue(dev);
1596                 } else
1597                         netif_schedule(dev);
1598         }
1599 }
1600
1601 static void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1602 {
1603         int i, j;
1604         struct ieee80211_tx_stored_packet *store;
1605
1606         for (i = 0; i < local->hw.queues; i++) {
1607                 if (!__ieee80211_queue_pending(local, i))
1608                         continue;
1609                 store = &local->pending_packet[i];
1610                 kfree_skb(store->skb);
1611                 for (j = 0; j < store->num_extra_frag; j++)
1612                         kfree_skb(store->extra_frag[j]);
1613                 kfree(store->extra_frag);
1614                 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1615         }
1616 }
1617
1618 static int ieee80211_master_start_xmit(struct sk_buff *skb,
1619                                        struct net_device *dev)
1620 {
1621         struct ieee80211_tx_control control;
1622         struct ieee80211_tx_packet_data *pkt_data;
1623         struct net_device *odev = NULL;
1624         struct ieee80211_sub_if_data *osdata;
1625         int headroom;
1626         int ret;
1627
1628         /*
1629          * copy control out of the skb so other people can use skb->cb
1630          */
1631         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1632         memset(&control, 0, sizeof(struct ieee80211_tx_control));
1633
1634         if (pkt_data->ifindex)
1635                 odev = dev_get_by_index(pkt_data->ifindex);
1636         if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1637                 dev_put(odev);
1638                 odev = NULL;
1639         }
1640         if (unlikely(!odev)) {
1641 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1642                 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1643                        "originating device\n", dev->name);
1644 #endif
1645                 dev_kfree_skb(skb);
1646                 return 0;
1647         }
1648         osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1649
1650         headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1651         if (skb_headroom(skb) < headroom) {
1652                 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1653                         dev_kfree_skb(skb);
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             local->ops->add_interface) {
2610                 conf.if_id = -1;
2611                 conf.type = IEEE80211_IF_TYPE_MNTR;
2612                 conf.mac_addr = NULL;
2613                 local->ops->add_interface(local_to_hw(local), &conf);
2614         }
2615 }
2616
2617 static int ieee80211_open(struct net_device *dev)
2618 {
2619         struct ieee80211_sub_if_data *sdata, *nsdata;
2620         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2621         struct ieee80211_if_init_conf conf;
2622         int res;
2623
2624         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2625         read_lock(&local->sub_if_lock);
2626         list_for_each_entry(nsdata, &local->sub_if_list, list) {
2627                 struct net_device *ndev = nsdata->dev;
2628
2629                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
2630                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
2631                     !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
2632                         read_unlock(&local->sub_if_lock);
2633                         return -ENOTUNIQ;
2634                 }
2635         }
2636         read_unlock(&local->sub_if_lock);
2637
2638         if (sdata->type == IEEE80211_IF_TYPE_WDS &&
2639             is_zero_ether_addr(sdata->u.wds.remote_addr))
2640                 return -ENOLINK;
2641
2642         if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
2643             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2644                 /* run the interface in a "soft monitor" mode */
2645                 local->monitors++;
2646                 local->open_count++;
2647                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2648                 return 0;
2649         }
2650         ieee80211_start_soft_monitor(local);
2651
2652         if (local->ops->add_interface) {
2653                 conf.if_id = dev->ifindex;
2654                 conf.type = sdata->type;
2655                 conf.mac_addr = dev->dev_addr;
2656                 res = local->ops->add_interface(local_to_hw(local), &conf);
2657                 if (res) {
2658                         if (sdata->type == IEEE80211_IF_TYPE_MNTR)
2659                                 ieee80211_start_hard_monitor(local);
2660                         return res;
2661                 }
2662         } else {
2663                 if (sdata->type != IEEE80211_IF_TYPE_STA)
2664                         return -EOPNOTSUPP;
2665                 if (local->open_count > 0)
2666                         return -ENOBUFS;
2667         }
2668
2669         if (local->open_count == 0) {
2670                 res = 0;
2671                 tasklet_enable(&local->tx_pending_tasklet);
2672                 tasklet_enable(&local->tasklet);
2673                 if (local->ops->open)
2674                         res = local->ops->open(local_to_hw(local));
2675                 if (res == 0) {
2676                         res = dev_open(local->mdev);
2677                         if (res) {
2678                                 if (local->ops->stop)
2679                                         local->ops->stop(local_to_hw(local));
2680                         } else {
2681                                 res = ieee80211_hw_config(local);
2682                                 if (res && local->ops->stop)
2683                                         local->ops->stop(local_to_hw(local));
2684                                 else if (!res && local->apdev)
2685                                         dev_open(local->apdev);
2686                         }
2687                 }
2688                 if (res) {
2689                         if (local->ops->remove_interface)
2690                                 local->ops->remove_interface(local_to_hw(local),
2691                                                             &conf);
2692                         return res;
2693                 }
2694         }
2695         local->open_count++;
2696
2697         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2698                 local->monitors++;
2699                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2700         } else
2701                 ieee80211_if_config(dev);
2702
2703         if (sdata->type == IEEE80211_IF_TYPE_STA &&
2704             !local->user_space_mlme)
2705                 netif_carrier_off(dev);
2706         else
2707                 netif_carrier_on(dev);
2708
2709         netif_start_queue(dev);
2710         return 0;
2711 }
2712
2713
2714 static int ieee80211_stop(struct net_device *dev)
2715 {
2716         struct ieee80211_sub_if_data *sdata;
2717         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2718
2719         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2720
2721         if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
2722             local->open_count > 1 &&
2723             !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2724                 /* remove "soft monitor" interface */
2725                 local->open_count--;
2726                 local->monitors--;
2727                 if (!local->monitors)
2728                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2729                 return 0;
2730         }
2731
2732         netif_stop_queue(dev);
2733         ieee80211_if_shutdown(dev);
2734
2735         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2736                 local->monitors--;
2737                 if (!local->monitors)
2738                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2739         }
2740
2741         local->open_count--;
2742         if (local->open_count == 0) {
2743                 if (netif_running(local->mdev))
2744                         dev_close(local->mdev);
2745                 if (local->apdev)
2746                         dev_close(local->apdev);
2747                 if (local->ops->stop)
2748                         local->ops->stop(local_to_hw(local));
2749                 tasklet_disable(&local->tx_pending_tasklet);
2750                 tasklet_disable(&local->tasklet);
2751         }
2752         if (local->ops->remove_interface) {
2753                 struct ieee80211_if_init_conf conf;
2754
2755                 conf.if_id = dev->ifindex;
2756                 conf.type = sdata->type;
2757                 conf.mac_addr = dev->dev_addr;
2758                 local->ops->remove_interface(local_to_hw(local), &conf);
2759         }
2760
2761         ieee80211_start_hard_monitor(local);
2762
2763         return 0;
2764 }
2765
2766
2767 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
2768 {
2769         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
2770         return ETH_ALEN;
2771 }
2772
2773 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
2774 {
2775         return compare_ether_addr(raddr, addr) == 0 ||
2776                is_broadcast_ether_addr(raddr);
2777 }
2778
2779
2780 static ieee80211_txrx_result
2781 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
2782 {
2783         struct net_device *dev = rx->dev;
2784         struct ieee80211_local *local = rx->local;
2785         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
2786         u16 fc, hdrlen, ethertype;
2787         u8 *payload;
2788         u8 dst[ETH_ALEN];
2789         u8 src[ETH_ALEN];
2790         struct sk_buff *skb = rx->skb, *skb2;
2791         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2792
2793         fc = rx->fc;
2794         if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
2795                 return TXRX_CONTINUE;
2796
2797         if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
2798                 return TXRX_DROP;
2799
2800         hdrlen = ieee80211_get_hdrlen(fc);
2801
2802         /* convert IEEE 802.11 header + possible LLC headers into Ethernet
2803          * header
2804          * IEEE 802.11 address fields:
2805          * ToDS FromDS Addr1 Addr2 Addr3 Addr4
2806          *   0     0   DA    SA    BSSID n/a
2807          *   0     1   DA    BSSID SA    n/a
2808          *   1     0   BSSID SA    DA    n/a
2809          *   1     1   RA    TA    DA    SA
2810          */
2811
2812         switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
2813         case IEEE80211_FCTL_TODS:
2814                 /* BSSID SA DA */
2815                 memcpy(dst, hdr->addr3, ETH_ALEN);
2816                 memcpy(src, hdr->addr2, ETH_ALEN);
2817
2818                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
2819                              sdata->type != IEEE80211_IF_TYPE_VLAN)) {
2820                         printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
2821                                MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
2822                                dev->name, MAC_ARG(hdr->addr1),
2823                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
2824                         return TXRX_DROP;
2825                 }
2826                 break;
2827         case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
2828                 /* RA TA DA SA */
2829                 memcpy(dst, hdr->addr3, ETH_ALEN);
2830                 memcpy(src, hdr->addr4, ETH_ALEN);
2831
2832                 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
2833                         printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
2834                                MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
2835                                MAC_FMT ")\n",
2836                                rx->dev->name, MAC_ARG(hdr->addr1),
2837                                MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
2838                                MAC_ARG(hdr->addr4));
2839                         return TXRX_DROP;
2840                 }
2841                 break;
2842         case IEEE80211_FCTL_FROMDS:
2843                 /* DA BSSID SA */
2844                 memcpy(dst, hdr->addr1, ETH_ALEN);
2845                 memcpy(src, hdr->addr3, ETH_ALEN);
2846
2847                 if (sdata->type != IEEE80211_IF_TYPE_STA) {
2848                         return TXRX_DROP;
2849                 }
2850                 break;
2851         case 0:
2852                 /* DA SA BSSID */
2853                 memcpy(dst, hdr->addr1, ETH_ALEN);
2854                 memcpy(src, hdr->addr2, ETH_ALEN);
2855
2856                 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
2857                         if (net_ratelimit()) {
2858                                 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
2859                                        MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
2860                                        ")\n",
2861                                        dev->name, MAC_ARG(hdr->addr1),
2862                                        MAC_ARG(hdr->addr2),
2863                                        MAC_ARG(hdr->addr3));
2864                         }
2865                         return TXRX_DROP;
2866                 }
2867                 break;
2868         }
2869
2870         payload = skb->data + hdrlen;
2871
2872         if (unlikely(skb->len - hdrlen < 8)) {
2873                 if (net_ratelimit()) {
2874                         printk(KERN_DEBUG "%s: RX too short data frame "
2875                                "payload\n", dev->name);
2876                 }
2877                 return TXRX_DROP;
2878         }
2879
2880         ethertype = (payload[6] << 8) | payload[7];
2881
2882         if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
2883                     ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
2884                    compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
2885                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
2886                  * replace EtherType */
2887                 skb_pull(skb, hdrlen + 6);
2888                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
2889                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
2890         } else {
2891                 struct ethhdr *ehdr;
2892                 __be16 len;
2893                 skb_pull(skb, hdrlen);
2894                 len = htons(skb->len);
2895                 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
2896                 memcpy(ehdr->h_dest, dst, ETH_ALEN);
2897                 memcpy(ehdr->h_source, src, ETH_ALEN);
2898                 ehdr->h_proto = len;
2899         }
2900         skb->dev = dev;
2901
2902         skb2 = NULL;
2903
2904         sdata->stats.rx_packets++;
2905         sdata->stats.rx_bytes += skb->len;
2906
2907         if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
2908             || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
2909                 if (is_multicast_ether_addr(skb->data)) {
2910                         /* send multicast frames both to higher layers in
2911                          * local net stack and back to the wireless media */
2912                         skb2 = skb_copy(skb, GFP_ATOMIC);
2913                         if (!skb2)
2914                                 printk(KERN_DEBUG "%s: failed to clone "
2915                                        "multicast frame\n", dev->name);
2916                 } else {
2917                         struct sta_info *dsta;
2918                         dsta = sta_info_get(local, skb->data);
2919                         if (dsta && !dsta->dev) {
2920                                 printk(KERN_DEBUG "Station with null dev "
2921                                        "structure!\n");
2922                         } else if (dsta && dsta->dev == dev) {
2923                                 /* Destination station is associated to this
2924                                  * AP, so send the frame directly to it and
2925                                  * do not pass the frame to local net stack.
2926                                  */
2927                                 skb2 = skb;
2928                                 skb = NULL;
2929                         }
2930                         if (dsta)
2931                                 sta_info_put(dsta);
2932                 }
2933         }
2934
2935         if (skb) {
2936                 /* deliver to local stack */
2937                 skb->protocol = eth_type_trans(skb, dev);
2938                 memset(skb->cb, 0, sizeof(skb->cb));
2939                 netif_rx(skb);
2940         }
2941
2942         if (skb2) {
2943                 /* send to wireless media */
2944                 skb2->protocol = __constant_htons(ETH_P_802_3);
2945                 skb_set_network_header(skb2, 0);
2946                 skb_set_mac_header(skb2, 0);
2947                 dev_queue_xmit(skb2);
2948         }
2949
2950         return TXRX_QUEUED;
2951 }
2952
2953
2954 static struct ieee80211_rate *
2955 ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
2956 {
2957         struct ieee80211_hw_mode *mode;
2958         int r;
2959
2960         list_for_each_entry(mode, &local->modes_list, list) {
2961                 if (mode->mode != phymode)
2962                         continue;
2963                 for (r = 0; r < mode->num_rates; r++) {
2964                         struct ieee80211_rate *rate = &mode->rates[r];
2965                         if (rate->val == hw_rate ||
2966                             (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
2967                              rate->val2 == hw_rate))
2968                                 return rate;
2969                 }
2970         }
2971
2972         return NULL;
2973 }
2974
2975 static void
2976 ieee80211_fill_frame_info(struct ieee80211_local *local,
2977                           struct ieee80211_frame_info *fi,
2978                           struct ieee80211_rx_status *status)
2979 {
2980         if (status) {
2981                 struct timespec ts;
2982                 struct ieee80211_rate *rate;
2983
2984                 jiffies_to_timespec(jiffies, &ts);
2985                 fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
2986                                            ts.tv_nsec / 1000);
2987                 fi->mactime = cpu_to_be64(status->mactime);
2988                 switch (status->phymode) {
2989                 case MODE_IEEE80211A:
2990                         fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
2991                         break;
2992                 case MODE_IEEE80211B:
2993                         fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
2994                         break;
2995                 case MODE_IEEE80211G:
2996                         fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
2997                         break;
2998                 case MODE_ATHEROS_TURBO:
2999                         fi->phytype =
3000                                 htonl(ieee80211_phytype_dsss_dot11_turbo);
3001                         break;
3002                 default:
3003                         fi->phytype = htonl(0xAAAAAAAA);
3004                         break;
3005                 }
3006                 fi->channel = htonl(status->channel);
3007                 rate = ieee80211_get_rate(local, status->phymode,
3008                                           status->rate);
3009                 if (rate) {
3010                         fi->datarate = htonl(rate->rate);
3011                         if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
3012                                 if (status->rate == rate->val)
3013                                         fi->preamble = htonl(2); /* long */
3014                                 else if (status->rate == rate->val2)
3015                                         fi->preamble = htonl(1); /* short */
3016                         } else
3017                                 fi->preamble = htonl(0);
3018                 } else {
3019                         fi->datarate = htonl(0);
3020                         fi->preamble = htonl(0);
3021                 }
3022
3023                 fi->antenna = htonl(status->antenna);
3024                 fi->priority = htonl(0xffffffff); /* no clue */
3025                 fi->ssi_type = htonl(ieee80211_ssi_raw);
3026                 fi->ssi_signal = htonl(status->ssi);
3027                 fi->ssi_noise = 0x00000000;
3028                 fi->encoding = 0;
3029         } else {
3030                 /* clear everything because we really don't know.
3031                  * the msg_type field isn't present on monitor frames
3032                  * so we don't know whether it will be present or not,
3033                  * but it's ok to not clear it since it'll be assigned
3034                  * anyway */
3035                 memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
3036
3037                 fi->ssi_type = htonl(ieee80211_ssi_none);
3038         }
3039         fi->version = htonl(IEEE80211_FI_VERSION);
3040         fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
3041 }
3042
3043 /* this routine is actually not just for this, but also
3044  * for pushing fake 'management' frames into userspace.
3045  * it shall be replaced by a netlink-based system. */
3046 void
3047 ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
3048                   struct ieee80211_rx_status *status, u32 msg_type)
3049 {
3050         struct ieee80211_frame_info *fi;
3051         const size_t hlen = sizeof(struct ieee80211_frame_info);
3052         struct ieee80211_sub_if_data *sdata;
3053
3054         skb->dev = local->apdev;
3055
3056         sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
3057
3058         if (skb_headroom(skb) < hlen) {
3059                 I802_DEBUG_INC(local->rx_expand_skb_head);
3060                 if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
3061                         dev_kfree_skb(skb);
3062                         return;
3063                 }
3064         }
3065
3066         fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
3067
3068         ieee80211_fill_frame_info(local, fi, status);
3069         fi->msg_type = htonl(msg_type);
3070
3071         sdata->stats.rx_packets++;
3072         sdata->stats.rx_bytes += skb->len;
3073
3074         skb_set_mac_header(skb, 0);
3075         skb->ip_summed = CHECKSUM_UNNECESSARY;
3076         skb->pkt_type = PACKET_OTHERHOST;
3077         skb->protocol = htons(ETH_P_802_2);
3078         memset(skb->cb, 0, sizeof(skb->cb));
3079         netif_rx(skb);
3080 }
3081
3082 static void
3083 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
3084                      struct ieee80211_rx_status *status)
3085 {
3086         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3087         struct ieee80211_sub_if_data *sdata;
3088         struct ieee80211_rate *rate;
3089         struct ieee80211_rtap_hdr {
3090                 struct ieee80211_radiotap_header hdr;
3091                 u8 flags;
3092                 u8 rate;
3093                 __le16 chan_freq;
3094                 __le16 chan_flags;
3095                 u8 antsignal;
3096         } __attribute__ ((packed)) *rthdr;
3097
3098         skb->dev = dev;
3099
3100         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3101
3102         if (status->flag & RX_FLAG_RADIOTAP)
3103                 goto out;
3104
3105         if (skb_headroom(skb) < sizeof(*rthdr)) {
3106                 I802_DEBUG_INC(local->rx_expand_skb_head);
3107                 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
3108                         dev_kfree_skb(skb);
3109                         return;
3110                 }
3111         }
3112
3113         rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
3114         memset(rthdr, 0, sizeof(*rthdr));
3115         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
3116         rthdr->hdr.it_present =
3117                 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3118                             (1 << IEEE80211_RADIOTAP_RATE) |
3119                             (1 << IEEE80211_RADIOTAP_CHANNEL) |
3120                             (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
3121         rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
3122                        IEEE80211_RADIOTAP_F_FCS : 0;
3123         rate = ieee80211_get_rate(local, status->phymode, status->rate);
3124         if (rate)
3125                 rthdr->rate = rate->rate / 5;
3126         rthdr->chan_freq = cpu_to_le16(status->freq);
3127         rthdr->chan_flags =
3128                 status->phymode == MODE_IEEE80211A ?
3129                 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
3130                 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
3131         rthdr->antsignal = status->ssi;
3132
3133  out:
3134         sdata->stats.rx_packets++;
3135         sdata->stats.rx_bytes += skb->len;
3136
3137         skb_set_mac_header(skb, 0);
3138         skb->ip_summed = CHECKSUM_UNNECESSARY;
3139         skb->pkt_type = PACKET_OTHERHOST;
3140         skb->protocol = htons(ETH_P_802_2);
3141         memset(skb->cb, 0, sizeof(skb->cb));
3142         netif_rx(skb);
3143 }
3144
3145 int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
3146                            int radar, int radar_type)
3147 {
3148         struct sk_buff *skb;
3149         struct ieee80211_radar_info *msg;
3150         struct ieee80211_local *local = hw_to_local(hw);
3151
3152         if (!local->apdev)
3153                 return 0;
3154
3155         skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
3156                             sizeof(struct ieee80211_radar_info));
3157
3158         if (!skb)
3159                 return -ENOMEM;
3160         skb_reserve(skb, sizeof(struct ieee80211_frame_info));
3161
3162         msg = (struct ieee80211_radar_info *)
3163                 skb_put(skb, sizeof(struct ieee80211_radar_info));
3164         msg->channel = channel;
3165         msg->radar = radar;
3166         msg->radar_type = radar_type;
3167
3168         ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
3169         return 0;
3170 }
3171 EXPORT_SYMBOL(ieee80211_radar_status);
3172
3173
3174 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
3175 {
3176         struct ieee80211_sub_if_data *sdata;
3177         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3178
3179         if (sdata->bss)
3180                 atomic_inc(&sdata->bss->num_sta_ps);
3181         sta->flags |= WLAN_STA_PS;
3182         sta->pspoll = 0;
3183 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3184         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
3185                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3186 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3187 }
3188
3189
3190 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
3191 {
3192         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3193         struct sk_buff *skb;
3194         int sent = 0;
3195         struct ieee80211_sub_if_data *sdata;
3196         struct ieee80211_tx_packet_data *pkt_data;
3197
3198         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3199         if (sdata->bss)
3200                 atomic_dec(&sdata->bss->num_sta_ps);
3201         sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
3202         sta->pspoll = 0;
3203         if (!skb_queue_empty(&sta->ps_tx_buf)) {
3204                 if (local->ops->set_tim)
3205                         local->ops->set_tim(local_to_hw(local), sta->aid, 0);
3206                 if (sdata->bss)
3207                         bss_tim_clear(local, sdata->bss, sta->aid);
3208         }
3209 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3210         printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
3211                "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3212 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3213         /* Send all buffered frames to the station */
3214         while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
3215                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3216                 sent++;
3217                 pkt_data->requeue = 1;
3218                 dev_queue_xmit(skb);
3219         }
3220         while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
3221                 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3222                 local->total_ps_buffered--;
3223                 sent++;
3224 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3225                 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
3226                        "since STA not sleeping anymore\n", dev->name,
3227                        MAC_ARG(sta->addr), sta->aid);
3228 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3229                 pkt_data->requeue = 1;
3230                 dev_queue_xmit(skb);
3231         }
3232
3233         return sent;
3234 }
3235
3236
3237 static ieee80211_txrx_result
3238 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
3239 {
3240         struct sk_buff *skb;
3241         int no_pending_pkts;
3242
3243         if (likely(!rx->sta ||
3244                    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
3245                    (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
3246                    !rx->u.rx.ra_match))
3247                 return TXRX_CONTINUE;
3248
3249         skb = skb_dequeue(&rx->sta->tx_filtered);
3250         if (!skb) {
3251                 skb = skb_dequeue(&rx->sta->ps_tx_buf);
3252                 if (skb)
3253                         rx->local->total_ps_buffered--;
3254         }
3255         no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
3256                 skb_queue_empty(&rx->sta->ps_tx_buf);
3257
3258         if (skb) {
3259                 struct ieee80211_hdr *hdr =
3260                         (struct ieee80211_hdr *) skb->data;
3261
3262                 /* tell TX path to send one frame even though the STA may
3263                  * still remain is PS mode after this frame exchange */
3264                 rx->sta->pspoll = 1;
3265
3266 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3267                 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
3268                        "after %d)\n",
3269                        MAC_ARG(rx->sta->addr), rx->sta->aid,
3270                        skb_queue_len(&rx->sta->ps_tx_buf));
3271 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3272
3273                 /* Use MoreData flag to indicate whether there are more
3274                  * buffered frames for this STA */
3275                 if (no_pending_pkts) {
3276                         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
3277                         rx->sta->flags &= ~WLAN_STA_TIM;
3278                 } else
3279                         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3280
3281                 dev_queue_xmit(skb);
3282
3283                 if (no_pending_pkts) {
3284                         if (rx->local->ops->set_tim)
3285                                 rx->local->ops->set_tim(local_to_hw(rx->local),
3286                                                        rx->sta->aid, 0);
3287                         if (rx->sdata->bss)
3288                                 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
3289                 }
3290 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3291         } else if (!rx->u.rx.sent_ps_buffered) {
3292                 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
3293                        "though there is no buffered frames for it\n",
3294                        rx->dev->name, MAC_ARG(rx->sta->addr));
3295 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3296
3297         }
3298
3299         /* Free PS Poll skb here instead of returning TXRX_DROP that would
3300          * count as an dropped frame. */
3301         dev_kfree_skb(rx->skb);
3302
3303         return TXRX_QUEUED;
3304 }
3305
3306
3307 static inline struct ieee80211_fragment_entry *
3308 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
3309                          unsigned int frag, unsigned int seq, int rx_queue,
3310                          struct sk_buff **skb)
3311 {
3312         struct ieee80211_fragment_entry *entry;
3313         int idx;
3314
3315         idx = sdata->fragment_next;
3316         entry = &sdata->fragments[sdata->fragment_next++];
3317         if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
3318                 sdata->fragment_next = 0;
3319
3320         if (!skb_queue_empty(&entry->skb_list)) {
3321 #ifdef CONFIG_MAC80211_DEBUG
3322                 struct ieee80211_hdr *hdr =
3323                         (struct ieee80211_hdr *) entry->skb_list.next->data;
3324                 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
3325                        "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
3326                        "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
3327                        sdata->dev->name, idx,
3328                        jiffies - entry->first_frag_time, entry->seq,
3329                        entry->last_frag, MAC_ARG(hdr->addr1),
3330                        MAC_ARG(hdr->addr2));
3331 #endif /* CONFIG_MAC80211_DEBUG */
3332                 __skb_queue_purge(&entry->skb_list);
3333         }
3334
3335         __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
3336         *skb = NULL;
3337         entry->first_frag_time = jiffies;
3338         entry->seq = seq;
3339         entry->rx_queue = rx_queue;
3340         entry->last_frag = frag;
3341         entry->ccmp = 0;
3342         entry->extra_len = 0;
3343
3344         return entry;
3345 }
3346
3347
3348 static inline struct ieee80211_fragment_entry *
3349 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
3350                           u16 fc, unsigned int frag, unsigned int seq,
3351                           int rx_queue, struct ieee80211_hdr *hdr)
3352 {
3353         struct ieee80211_fragment_entry *entry;
3354         int i, idx;
3355
3356         idx = sdata->fragment_next;
3357         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
3358                 struct ieee80211_hdr *f_hdr;
3359                 u16 f_fc;
3360
3361                 idx--;
3362                 if (idx < 0)
3363                         idx = IEEE80211_FRAGMENT_MAX - 1;
3364
3365                 entry = &sdata->fragments[idx];
3366                 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
3367                     entry->rx_queue != rx_queue ||
3368                     entry->last_frag + 1 != frag)
3369                         continue;
3370
3371                 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
3372                 f_fc = le16_to_cpu(f_hdr->frame_control);
3373
3374                 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
3375                     compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
3376                     compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
3377                         continue;
3378
3379                 if (entry->first_frag_time + 2 * HZ < jiffies) {
3380                         __skb_queue_purge(&entry->skb_list);
3381                         continue;
3382                 }
3383                 return entry;
3384         }
3385
3386         return NULL;
3387 }
3388
3389
3390 static ieee80211_txrx_result
3391 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
3392 {
3393         struct ieee80211_hdr *hdr;
3394         u16 sc;
3395         unsigned int frag, seq;
3396         struct ieee80211_fragment_entry *entry;
3397         struct sk_buff *skb;
3398
3399         hdr = (struct ieee80211_hdr *) rx->skb->data;
3400         sc = le16_to_cpu(hdr->seq_ctrl);
3401         frag = sc & IEEE80211_SCTL_FRAG;
3402
3403         if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
3404                    (rx->skb)->len < 24 ||
3405                    is_multicast_ether_addr(hdr->addr1))) {
3406                 /* not fragmented */
3407                 goto out;
3408         }
3409         I802_DEBUG_INC(rx->local->rx_handlers_fragments);
3410
3411         seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
3412
3413         if (frag == 0) {
3414                 /* This is the first fragment of a new frame. */
3415                 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
3416                                                  rx->u.rx.queue, &(rx->skb));
3417                 if (rx->key && rx->key->alg == ALG_CCMP &&
3418                     (rx->fc & IEEE80211_FCTL_PROTECTED)) {
3419                         /* Store CCMP PN so that we can verify that the next
3420                          * fragment has a sequential PN value. */
3421                         entry->ccmp = 1;
3422                         memcpy(entry->last_pn,
3423                                rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
3424                                CCMP_PN_LEN);
3425                 }
3426                 return TXRX_QUEUED;
3427         }
3428
3429         /* This is a fragment for a frame that should already be pending in
3430          * fragment cache. Add this fragment to the end of the pending entry.
3431          */
3432         entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
3433                                           rx->u.rx.queue, hdr);
3434         if (!entry) {
3435                 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3436                 return TXRX_DROP;
3437         }
3438
3439         /* Verify that MPDUs within one MSDU have sequential PN values.
3440          * (IEEE 802.11i, 8.3.3.4.5) */
3441         if (entry->ccmp) {
3442                 int i;
3443                 u8 pn[CCMP_PN_LEN], *rpn;
3444                 if (!rx->key || rx->key->alg != ALG_CCMP)
3445                         return TXRX_DROP;
3446                 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
3447                 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
3448                         pn[i]++;
3449                         if (pn[i])
3450                                 break;
3451                 }
3452                 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
3453                 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
3454                         printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
3455                                " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
3456                                "(expected %02x%02x%02x%02x%02x%02x)\n",
3457                                rx->dev->name, MAC_ARG(hdr->addr2),
3458                                rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
3459                                pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
3460                         return TXRX_DROP;
3461                 }
3462                 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
3463         }
3464
3465         skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
3466         __skb_queue_tail(&entry->skb_list, rx->skb);
3467         entry->last_frag = frag;
3468         entry->extra_len += rx->skb->len;
3469         if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
3470                 rx->skb = NULL;
3471                 return TXRX_QUEUED;
3472         }
3473
3474         rx->skb = __skb_dequeue(&entry->skb_list);
3475         if (skb_tailroom(rx->skb) < entry->extra_len) {
3476                 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
3477                 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
3478                                               GFP_ATOMIC))) {
3479                         I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3480                         __skb_queue_purge(&entry->skb_list);
3481                         return TXRX_DROP;
3482                 }
3483         }
3484         while ((skb = __skb_dequeue(&entry->skb_list))) {
3485                 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
3486                 dev_kfree_skb(skb);
3487         }
3488
3489         /* Complete frame has been reassembled - process it now */
3490         rx->fragmented = 1;
3491
3492  out:
3493         if (rx->sta)
3494                 rx->sta->rx_packets++;
3495         if (is_multicast_ether_addr(hdr->addr1))
3496                 rx->local->dot11MulticastReceivedFrameCount++;
3497         else
3498                 ieee80211_led_rx(rx->local);
3499         return TXRX_CONTINUE;
3500 }
3501
3502
3503 static ieee80211_txrx_result
3504 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
3505 {
3506         if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
3507                 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
3508                 return TXRX_QUEUED;
3509         }
3510
3511         if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
3512                 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb));
3513
3514         return TXRX_CONTINUE;
3515 }
3516
3517
3518 static ieee80211_txrx_result
3519 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
3520 {
3521         struct ieee80211_hdr *hdr;
3522         int always_sta_key;
3523         hdr = (struct ieee80211_hdr *) rx->skb->data;
3524
3525         /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
3526         if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
3527                 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
3528                              rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
3529                              hdr->seq_ctrl)) {
3530                         if (rx->u.rx.ra_match) {
3531                                 rx->local->dot11FrameDuplicateCount++;
3532                                 rx->sta->num_duplicates++;
3533                         }
3534                         return TXRX_DROP;
3535                 } else
3536                         rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
3537         }
3538
3539         if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
3540             rx->skb->len > FCS_LEN)
3541                 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
3542
3543         if (unlikely(rx->skb->len < 16)) {
3544                 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
3545                 return TXRX_DROP;
3546         }
3547
3548         if (!rx->u.rx.ra_match)
3549                 rx->skb->pkt_type = PACKET_OTHERHOST;
3550         else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
3551                 rx->skb->pkt_type = PACKET_HOST;
3552         else if (is_multicast_ether_addr(hdr->addr1)) {
3553                 if (is_broadcast_ether_addr(hdr->addr1))
3554                         rx->skb->pkt_type = PACKET_BROADCAST;
3555                 else
3556                         rx->skb->pkt_type = PACKET_MULTICAST;
3557         } else
3558                 rx->skb->pkt_type = PACKET_OTHERHOST;
3559
3560         /* Drop disallowed frame classes based on STA auth/assoc state;
3561          * IEEE 802.11, Chap 5.5.
3562          *
3563          * 80211.o does filtering only based on association state, i.e., it
3564          * drops Class 3 frames from not associated stations. hostapd sends
3565          * deauth/disassoc frames when needed. In addition, hostapd is
3566          * responsible for filtering on both auth and assoc states.
3567          */
3568         if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
3569                       ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
3570                        (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
3571                      rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
3572                      (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
3573                 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
3574                      !(rx->fc & IEEE80211_FCTL_TODS) &&
3575                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
3576                     || !rx->u.rx.ra_match) {
3577                         /* Drop IBSS frames and frames for other hosts
3578                          * silently. */
3579                         return TXRX_DROP;
3580                 }
3581
3582                 if (!rx->local->apdev)
3583                         return TXRX_DROP;
3584
3585                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3586                                   ieee80211_msg_sta_not_assoc);
3587                 return TXRX_QUEUED;
3588         }
3589
3590         if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
3591                 always_sta_key = 0;
3592         else
3593                 always_sta_key = 1;
3594
3595         if (rx->sta && rx->sta->key && always_sta_key) {
3596                 rx->key = rx->sta->key;
3597         } else {
3598                 if (rx->sta && rx->sta->key)
3599                         rx->key = rx->sta->key;
3600                 else
3601                         rx->key = rx->sdata->default_key;
3602
3603                 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3604                     rx->fc & IEEE80211_FCTL_PROTECTED) {
3605                         int keyidx = ieee80211_wep_get_keyidx(rx->skb);
3606
3607                         if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
3608                             (!rx->sta || !rx->sta->key || keyidx > 0))
3609                                 rx->key = rx->sdata->keys[keyidx];
3610
3611                         if (!rx->key) {
3612                                 if (!rx->u.rx.ra_match)
3613                                         return TXRX_DROP;
3614                                 printk(KERN_DEBUG "%s: RX WEP frame with "
3615                                        "unknown keyidx %d (A1=" MAC_FMT " A2="
3616                                        MAC_FMT " A3=" MAC_FMT ")\n",
3617                                        rx->dev->name, keyidx,
3618                                        MAC_ARG(hdr->addr1),
3619                                        MAC_ARG(hdr->addr2),
3620                                        MAC_ARG(hdr->addr3));
3621                                 if (!rx->local->apdev)
3622                                         return TXRX_DROP;
3623                                 ieee80211_rx_mgmt(
3624                                         rx->local, rx->skb, rx->u.rx.status,
3625                                         ieee80211_msg_wep_frame_unknown_key);
3626                                 return TXRX_QUEUED;
3627                         }
3628                 }
3629         }
3630
3631         if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
3632                 rx->key->tx_rx_count++;
3633                 if (unlikely(rx->local->key_tx_rx_threshold &&
3634                              rx->key->tx_rx_count >
3635                              rx->local->key_tx_rx_threshold)) {
3636                         ieee80211_key_threshold_notify(rx->dev, rx->key,
3637                                                        rx->sta);
3638                 }
3639         }
3640
3641         return TXRX_CONTINUE;
3642 }
3643
3644
3645 static ieee80211_txrx_result
3646 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
3647 {
3648         struct sta_info *sta = rx->sta;
3649         struct net_device *dev = rx->dev;
3650         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3651
3652         if (!sta)
3653                 return TXRX_CONTINUE;
3654
3655         /* Update last_rx only for IBSS packets which are for the current
3656          * BSSID to avoid keeping the current IBSS network alive in cases where
3657          * other STAs are using different BSSID. */
3658         if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
3659                 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
3660                 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
3661                         sta->last_rx = jiffies;
3662         } else
3663         if (!is_multicast_ether_addr(hdr->addr1) ||
3664             rx->sdata->type == IEEE80211_IF_TYPE_STA) {
3665                 /* Update last_rx only for unicast frames in order to prevent
3666                  * the Probe Request frames (the only broadcast frames from a
3667                  * STA in infrastructure mode) from keeping a connection alive.
3668                  */
3669                 sta->last_rx = jiffies;
3670         }
3671
3672         if (!rx->u.rx.ra_match)
3673                 return TXRX_CONTINUE;
3674
3675         sta->rx_fragments++;
3676         sta->rx_bytes += rx->skb->len;
3677         sta->last_rssi = (sta->last_rssi * 15 +
3678                           rx->u.rx.status->ssi) / 16;
3679         sta->last_signal = (sta->last_signal * 15 +
3680                             rx->u.rx.status->signal) / 16;
3681         sta->last_noise = (sta->last_noise * 15 +
3682                            rx->u.rx.status->noise) / 16;
3683
3684         if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
3685                 /* Change STA power saving mode only in the end of a frame
3686                  * exchange sequence */
3687                 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
3688                         rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
3689                 else if (!(sta->flags & WLAN_STA_PS) &&
3690                          (rx->fc & IEEE80211_FCTL_PM))
3691                         ap_sta_ps_start(dev, sta);
3692         }
3693
3694         /* Drop data::nullfunc frames silently, since they are used only to
3695          * control station power saving mode. */
3696         if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3697             (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
3698                 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
3699                 /* Update counter and free packet here to avoid counting this
3700                  * as a dropped packed. */
3701                 sta->rx_packets++;
3702                 dev_kfree_skb(rx->skb);
3703                 return TXRX_QUEUED;
3704         }
3705
3706         return TXRX_CONTINUE;
3707 } /* ieee80211_rx_h_sta_process */
3708
3709
3710 static ieee80211_txrx_result
3711 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
3712 {
3713         if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3714             (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
3715             !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
3716                 return TXRX_CONTINUE;
3717
3718         /* Check for weak IVs, if hwaccel did not remove IV from the frame */
3719         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
3720             rx->key->force_sw_encrypt) {
3721                 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
3722                 if (iv) {
3723                         rx->sta->wep_weak_iv_count++;
3724                 }
3725         }
3726
3727         return TXRX_CONTINUE;
3728 }
3729
3730
3731 static ieee80211_txrx_result
3732 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
3733 {
3734         /* If the device handles decryption totally, skip this test */
3735         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3736                 return TXRX_CONTINUE;
3737
3738         if ((rx->key && rx->key->alg != ALG_WEP) ||
3739             !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3740             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3741              ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3742               (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
3743                 return TXRX_CONTINUE;
3744
3745         if (!rx->key) {
3746                 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
3747                        rx->dev->name);
3748                 return TXRX_DROP;
3749         }
3750
3751         if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
3752             rx->key->force_sw_encrypt) {
3753                 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
3754                         printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
3755                                "failed\n", rx->dev->name);
3756                         return TXRX_DROP;
3757                 }
3758         } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
3759                 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
3760                 /* remove ICV */
3761                 skb_trim(rx->skb, rx->skb->len - 4);
3762         }
3763
3764         return TXRX_CONTINUE;
3765 }
3766
3767
3768 static ieee80211_txrx_result
3769 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
3770 {
3771         if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
3772             rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
3773                 /* Pass both encrypted and unencrypted EAPOL frames to user
3774                  * space for processing. */
3775                 if (!rx->local->apdev)
3776                         return TXRX_DROP;
3777                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3778                                   ieee80211_msg_normal);
3779                 return TXRX_QUEUED;
3780         }
3781
3782         if (unlikely(rx->sdata->ieee802_1x &&
3783                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3784                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3785                      (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
3786                      !ieee80211_is_eapol(rx->skb))) {
3787 #ifdef CONFIG_MAC80211_DEBUG
3788                 struct ieee80211_hdr *hdr =
3789                         (struct ieee80211_hdr *) rx->skb->data;
3790                 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
3791                        " (unauthorized port)\n", rx->dev->name,
3792                        MAC_ARG(hdr->addr2));
3793 #endif /* CONFIG_MAC80211_DEBUG */
3794                 return TXRX_DROP;
3795         }
3796
3797         return TXRX_CONTINUE;
3798 }
3799
3800
3801 static ieee80211_txrx_result
3802 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
3803 {
3804         /*  If the device handles decryption totally, skip this test */
3805         if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3806                 return TXRX_CONTINUE;
3807
3808         /* Drop unencrypted frames if key is set. */
3809         if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
3810                      (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3811                      (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3812                      (rx->key || rx->sdata->drop_unencrypted) &&
3813                      (rx->sdata->eapol == 0 ||
3814                       !ieee80211_is_eapol(rx->skb)))) {
3815                 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
3816                        "encryption\n", rx->dev->name);
3817                 return TXRX_DROP;
3818         }
3819         return TXRX_CONTINUE;
3820 }
3821
3822
3823 static ieee80211_txrx_result
3824 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
3825 {
3826         struct ieee80211_sub_if_data *sdata;
3827
3828         if (!rx->u.rx.ra_match)
3829                 return TXRX_DROP;
3830
3831         sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
3832         if ((sdata->type == IEEE80211_IF_TYPE_STA ||
3833              sdata->type == IEEE80211_IF_TYPE_IBSS) &&
3834             !rx->local->user_space_mlme) {
3835                 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
3836         } else {
3837                 /* Management frames are sent to hostapd for processing */
3838                 if (!rx->local->apdev)
3839                         return TXRX_DROP;
3840                 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3841                                   ieee80211_msg_normal);
3842         }
3843         return TXRX_QUEUED;
3844 }
3845
3846
3847 static ieee80211_txrx_result
3848 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
3849 {
3850         struct ieee80211_local *local = rx->local;
3851         struct sk_buff *skb = rx->skb;
3852
3853         if (unlikely(local->sta_scanning != 0)) {
3854                 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
3855                 return TXRX_QUEUED;
3856         }
3857
3858         if (unlikely(rx->u.rx.in_scan)) {
3859                 /* scanning finished during invoking of handlers */
3860                 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
3861                 return TXRX_DROP;
3862         }
3863
3864         return TXRX_CONTINUE;
3865 }
3866
3867
3868 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
3869                                             struct ieee80211_hdr *hdr,
3870                                             struct sta_info *sta,
3871                                             struct ieee80211_txrx_data *rx)
3872 {
3873         int keyidx, hdrlen;
3874
3875         hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
3876         if (rx->skb->len >= hdrlen + 4)
3877                 keyidx = rx->skb->data[hdrlen + 3] >> 6;
3878         else
3879                 keyidx = -1;
3880
3881         /* TODO: verify that this is not triggered by fragmented
3882          * frames (hw does not verify MIC for them). */
3883         printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
3884                "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
3885                dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
3886
3887         if (!sta) {
3888                 /* Some hardware versions seem to generate incorrect
3889                  * Michael MIC reports; ignore them to avoid triggering
3890                  * countermeasures. */
3891                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3892                        "error for unknown address " MAC_FMT "\n",
3893                        dev->name, MAC_ARG(hdr->addr2));
3894                 goto ignore;
3895         }
3896
3897         if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
3898                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3899                        "error for a frame with no ISWEP flag (src "
3900                        MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
3901                 goto ignore;
3902         }
3903
3904         if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3905             rx->sdata->type == IEEE80211_IF_TYPE_AP) {
3906                 keyidx = ieee80211_wep_get_keyidx(rx->skb);
3907                 /* AP with Pairwise keys support should never receive Michael
3908                  * MIC errors for non-zero keyidx because these are reserved
3909                  * for group keys and only the AP is sending real multicast
3910                  * frames in BSS. */
3911                 if (keyidx) {
3912                         printk(KERN_DEBUG "%s: ignored Michael MIC error for "
3913                                "a frame with non-zero keyidx (%d) (src " MAC_FMT
3914                                ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
3915                         goto ignore;
3916                 }
3917         }
3918
3919         if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3920             ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3921              (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
3922                 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3923                        "error for a frame that cannot be encrypted "
3924                        "(fc=0x%04x) (src " MAC_FMT ")\n",
3925                        dev->name, rx->fc, MAC_ARG(hdr->addr2));
3926                 goto ignore;
3927         }
3928
3929         do {
3930                 union iwreq_data wrqu;
3931                 char *buf = kmalloc(128, GFP_ATOMIC);
3932                 if (!buf)
3933                         break;
3934
3935                 /* TODO: needed parameters: count, key type, TSC */
3936                 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
3937                         "keyid=%d %scast addr=" MAC_FMT ")",
3938                         keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
3939                         MAC_ARG(hdr->addr2));
3940                 memset(&wrqu, 0, sizeof(wrqu));
3941                 wrqu.data.length = strlen(buf);
3942                 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
3943                 kfree(buf);
3944         } while (0);
3945
3946         /* TODO: consider verifying the MIC error report with software
3947          * implementation if we get too many spurious reports from the
3948          * hardware. */
3949         if (!rx->local->apdev)
3950                 goto ignore;
3951         ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3952                           ieee80211_msg_michael_mic_failure);
3953         return;
3954
3955  ignore:
3956         dev_kfree_skb(rx->skb);
3957         rx->skb = NULL;
3958 }
3959
3960 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
3961                                 struct ieee80211_local *local,
3962                                 ieee80211_rx_handler *handlers,
3963                                 struct ieee80211_txrx_data *rx,
3964                                 struct sta_info *sta)
3965 {
3966         ieee80211_rx_handler *handler;
3967         ieee80211_txrx_result res = TXRX_DROP;
3968
3969         for (handler = handlers; *handler != NULL; handler++) {
3970                 res = (*handler)(rx);
3971                 if (res != TXRX_CONTINUE) {
3972                         if (res == TXRX_DROP) {
3973                                 I802_DEBUG_INC(local->rx_handlers_drop);
3974                                 if (sta)
3975                                         sta->rx_dropped++;
3976                         }
3977                         if (res == TXRX_QUEUED)
3978                                 I802_DEBUG_INC(local->rx_handlers_queued);
3979                         break;
3980                 }
3981         }
3982
3983         if (res == TXRX_DROP) {
3984                 dev_kfree_skb(rx->skb);
3985         }
3986         return res;
3987 }
3988
3989 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
3990                                                 ieee80211_rx_handler *handlers,
3991                                                 struct ieee80211_txrx_data *rx,
3992                                                 struct sta_info *sta)
3993 {
3994         if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
3995             TXRX_CONTINUE)
3996                 dev_kfree_skb(rx->skb);
3997 }
3998
3999 /*
4000  * This is the receive path handler. It is called by a low level driver when an
4001  * 802.11 MPDU is received from the hardware.
4002  */
4003 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
4004                     struct ieee80211_rx_status *status)
4005 {
4006         struct ieee80211_local *local = hw_to_local(hw);
4007         struct ieee80211_sub_if_data *sdata;
4008         struct sta_info *sta;
4009         struct ieee80211_hdr *hdr;
4010         struct ieee80211_txrx_data rx;
4011         u16 type;
4012         int multicast;
4013         int radiotap_len = 0;
4014
4015         if (status->flag & RX_FLAG_RADIOTAP) {
4016                 radiotap_len = ieee80211_get_radiotap_len(skb);
4017                 skb_pull(skb, radiotap_len);
4018         }
4019
4020         hdr = (struct ieee80211_hdr *) skb->data;
4021         memset(&rx, 0, sizeof(rx));
4022         rx.skb = skb;
4023         rx.local = local;
4024
4025         rx.u.rx.status = status;
4026         rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
4027         type = rx.fc & IEEE80211_FCTL_FTYPE;
4028         if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
4029                 local->dot11ReceivedFragmentCount++;
4030         multicast = is_multicast_ether_addr(hdr->addr1);
4031
4032         if (skb->len >= 16)
4033                 sta = rx.sta = sta_info_get(local, hdr->addr2);
4034         else
4035                 sta = rx.sta = NULL;
4036
4037         if (sta) {
4038                 rx.dev = sta->dev;
4039                 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
4040         }
4041
4042         if ((status->flag & RX_FLAG_MMIC_ERROR)) {
4043                 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
4044                 goto end;
4045         }
4046
4047         if (unlikely(local->sta_scanning))
4048                 rx.u.rx.in_scan = 1;
4049
4050         if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
4051                                            sta) != TXRX_CONTINUE)
4052                 goto end;
4053         skb = rx.skb;
4054
4055         skb_push(skb, radiotap_len);
4056         if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
4057             !local->iff_promiscs && !multicast) {
4058                 rx.u.rx.ra_match = 1;
4059                 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
4060                                              sta);
4061         } else {
4062                 struct ieee80211_sub_if_data *prev = NULL;
4063                 struct sk_buff *skb_new;
4064                 u8 *bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
4065
4066                 read_lock(&local->sub_if_lock);
4067                 list_for_each_entry(sdata, &local->sub_if_list, list) {
4068                         rx.u.rx.ra_match = 1;
4069                         switch (sdata->type) {
4070                         case IEEE80211_IF_TYPE_STA:
4071                                 if (!bssid)
4072                                         continue;
4073                                 if (!ieee80211_bssid_match(bssid,
4074                                                         sdata->u.sta.bssid)) {
4075                                         if (!rx.u.rx.in_scan)
4076                                                 continue;
4077                                         rx.u.rx.ra_match = 0;
4078                                 } else if (!multicast &&
4079                                            compare_ether_addr(sdata->dev->dev_addr,
4080                                                               hdr->addr1) != 0) {
4081                                         if (!sdata->promisc)
4082                                                 continue;
4083                                         rx.u.rx.ra_match = 0;
4084                                 }
4085                                 break;
4086                         case IEEE80211_IF_TYPE_IBSS:
4087                                 if (!bssid)
4088                                         continue;
4089                                 if (!ieee80211_bssid_match(bssid,
4090                                                         sdata->u.sta.bssid)) {
4091                                         if (!rx.u.rx.in_scan)
4092                                                 continue;
4093                                         rx.u.rx.ra_match = 0;
4094                                 } else if (!multicast &&
4095                                            compare_ether_addr(sdata->dev->dev_addr,
4096                                                               hdr->addr1) != 0) {
4097                                         if (!sdata->promisc)
4098                                                 continue;
4099                                         rx.u.rx.ra_match = 0;
4100                                 } else if (!sta)
4101                                         sta = rx.sta =
4102                                                 ieee80211_ibss_add_sta(sdata->dev,
4103                                                                        skb, bssid,
4104                                                                        hdr->addr2);
4105                                 break;
4106                         case IEEE80211_IF_TYPE_AP:
4107                                 if (!bssid) {
4108                                         if (compare_ether_addr(sdata->dev->dev_addr,
4109                                                                hdr->addr1) != 0)
4110                                                 continue;
4111                                 } else if (!ieee80211_bssid_match(bssid,
4112                                                         sdata->dev->dev_addr)) {
4113                                         if (!rx.u.rx.in_scan)
4114                                                 continue;
4115                                         rx.u.rx.ra_match = 0;
4116                                 }
4117                                 if (sdata->dev == local->mdev &&
4118                                     !rx.u.rx.in_scan)
4119                                         /* do not receive anything via
4120                                          * master device when not scanning */
4121                                         continue;
4122                                 break;
4123                         case IEEE80211_IF_TYPE_WDS:
4124                                 if (bssid ||
4125                                     (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
4126                                         continue;
4127                                 if (compare_ether_addr(sdata->u.wds.remote_addr,
4128                                                        hdr->addr2) != 0)
4129                                         continue;
4130                                 break;
4131                         }
4132
4133                         if (prev) {
4134                                 skb_new = skb_copy(skb, GFP_ATOMIC);
4135                                 if (!skb_new) {
4136                                         if (net_ratelimit())
4137                                                 printk(KERN_DEBUG "%s: failed to copy "
4138                                                        "multicast frame for %s",
4139                                                        local->mdev->name, prev->dev->name);
4140                                         continue;
4141                                 }
4142                                 rx.skb = skb_new;
4143                                 rx.dev = prev->dev;
4144                                 rx.sdata = prev;
4145                                 ieee80211_invoke_rx_handlers(local,
4146                                                              local->rx_handlers,
4147                                                              &rx, sta);
4148                         }
4149                         prev = sdata;
4150                 }
4151                 if (prev) {
4152                         rx.skb = skb;
4153                         rx.dev = prev->dev;
4154                         rx.sdata = prev;
4155                         ieee80211_invoke_rx_handlers(local, local->rx_handlers,
4156                                                      &rx, sta);
4157                 } else
4158                         dev_kfree_skb(skb);
4159                 read_unlock(&local->sub_if_lock);
4160         }
4161
4162   end:
4163         if (sta)
4164                 sta_info_put(sta);
4165 }
4166 EXPORT_SYMBOL(__ieee80211_rx);
4167
4168 static ieee80211_txrx_result
4169 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
4170 {
4171         struct ieee80211_local *local = tx->local;
4172         struct ieee80211_hw_mode *mode = tx->u.tx.mode;
4173         struct sk_buff *skb = tx->skb;
4174         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4175         u32 load = 0, hdrtime;
4176
4177         /* TODO: this could be part of tx_status handling, so that the number
4178          * of retries would be known; TX rate should in that case be stored
4179          * somewhere with the packet */
4180
4181         /* Estimate total channel use caused by this frame */
4182
4183         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4184          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4185
4186         if (mode->mode == MODE_IEEE80211A ||
4187             mode->mode == MODE_ATHEROS_TURBO ||
4188             mode->mode == MODE_ATHEROS_TURBOG ||
4189             (mode->mode == MODE_IEEE80211G &&
4190              tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
4191                 hdrtime = CHAN_UTIL_HDR_SHORT;
4192         else
4193                 hdrtime = CHAN_UTIL_HDR_LONG;
4194
4195         load = hdrtime;
4196         if (!is_multicast_ether_addr(hdr->addr1))
4197                 load += hdrtime;
4198
4199         if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
4200                 load += 2 * hdrtime;
4201         else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
4202                 load += hdrtime;
4203
4204         load += skb->len * tx->u.tx.rate->rate_inv;
4205
4206         if (tx->u.tx.extra_frag) {
4207                 int i;
4208                 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
4209                         load += 2 * hdrtime;
4210                         load += tx->u.tx.extra_frag[i]->len *
4211                                 tx->u.tx.rate->rate;
4212                 }
4213         }
4214
4215         /* Divide channel_use by 8 to avoid wrapping around the counter */
4216         load >>= CHAN_UTIL_SHIFT;
4217         local->channel_use_raw += load;
4218         if (tx->sta)
4219                 tx->sta->channel_use_raw += load;
4220         tx->sdata->channel_use_raw += load;
4221
4222         return TXRX_CONTINUE;
4223 }
4224
4225
4226 static ieee80211_txrx_result
4227 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
4228 {
4229         struct ieee80211_local *local = rx->local;
4230         struct sk_buff *skb = rx->skb;
4231         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4232         u32 load = 0, hdrtime;
4233         struct ieee80211_rate *rate;
4234         struct ieee80211_hw_mode *mode = local->hw.conf.mode;
4235         int i;
4236
4237         /* Estimate total channel use caused by this frame */
4238
4239         if (unlikely(mode->num_rates < 0))
4240                 return TXRX_CONTINUE;
4241
4242         rate = &mode->rates[0];
4243         for (i = 0; i < mode->num_rates; i++) {
4244                 if (mode->rates[i].val == rx->u.rx.status->rate) {
4245                         rate = &mode->rates[i];
4246                         break;
4247                 }
4248         }
4249
4250         /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4251          * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4252
4253         if (mode->mode == MODE_IEEE80211A ||
4254             mode->mode == MODE_ATHEROS_TURBO ||
4255             mode->mode == MODE_ATHEROS_TURBOG ||
4256             (mode->mode == MODE_IEEE80211G &&
4257              rate->flags & IEEE80211_RATE_ERP))
4258                 hdrtime = CHAN_UTIL_HDR_SHORT;
4259         else
4260                 hdrtime = CHAN_UTIL_HDR_LONG;
4261
4262         load = hdrtime;
4263         if (!is_multicast_ether_addr(hdr->addr1))
4264                 load += hdrtime;
4265
4266         load += skb->len * rate->rate_inv;
4267
4268         /* Divide channel_use by 8 to avoid wrapping around the counter */
4269         load >>= CHAN_UTIL_SHIFT;
4270         local->channel_use_raw += load;
4271         if (rx->sta)
4272                 rx->sta->channel_use_raw += load;
4273         rx->u.rx.load = load;
4274
4275         return TXRX_CONTINUE;
4276 }
4277
4278 static ieee80211_txrx_result
4279 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
4280 {
4281         rx->sdata->channel_use_raw += rx->u.rx.load;
4282         return TXRX_CONTINUE;
4283 }
4284
4285 static void ieee80211_stat_refresh(unsigned long data)
4286 {
4287         struct ieee80211_local *local = (struct ieee80211_local *) data;
4288         struct sta_info *sta;
4289         struct ieee80211_sub_if_data *sdata;
4290
4291         if (!local->stat_time)
4292                 return;
4293
4294         /* go through all stations */
4295         spin_lock_bh(&local->sta_lock);
4296         list_for_each_entry(sta, &local->sta_list, list) {
4297                 sta->channel_use = (sta->channel_use_raw / local->stat_time) /
4298                         CHAN_UTIL_PER_10MS;
4299                 sta->channel_use_raw = 0;
4300         }
4301         spin_unlock_bh(&local->sta_lock);
4302
4303         /* go through all subinterfaces */
4304         read_lock(&local->sub_if_lock);
4305         list_for_each_entry(sdata, &local->sub_if_list, list) {
4306                 sdata->channel_use = (sdata->channel_use_raw /
4307                                       local->stat_time) / CHAN_UTIL_PER_10MS;
4308                 sdata->channel_use_raw = 0;
4309         }
4310         read_unlock(&local->sub_if_lock);
4311
4312         /* hardware interface */
4313         local->channel_use = (local->channel_use_raw /
4314                               local->stat_time) / CHAN_UTIL_PER_10MS;
4315         local->channel_use_raw = 0;
4316
4317         local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
4318         add_timer(&local->stat_timer);
4319 }
4320
4321
4322 /* This is a version of the rx handler that can be called from hard irq
4323  * context. Post the skb on the queue and schedule the tasklet */
4324 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
4325                           struct ieee80211_rx_status *status)
4326 {
4327         struct ieee80211_local *local = hw_to_local(hw);
4328
4329         BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4330
4331         skb->dev = local->mdev;
4332         /* copy status into skb->cb for use by tasklet */
4333         memcpy(skb->cb, status, sizeof(*status));
4334         skb->pkt_type = IEEE80211_RX_MSG;
4335         skb_queue_tail(&local->skb_queue, skb);
4336         tasklet_schedule(&local->tasklet);
4337 }
4338 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4339
4340 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
4341                                  struct sk_buff *skb,
4342                                  struct ieee80211_tx_status *status)
4343 {
4344         struct ieee80211_local *local = hw_to_local(hw);
4345         struct ieee80211_tx_status *saved;
4346         int tmp;
4347
4348         skb->dev = local->mdev;
4349         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
4350         if (unlikely(!saved)) {
4351                 if (net_ratelimit())
4352                         printk(KERN_WARNING "%s: Not enough memory, "
4353                                "dropping tx status", skb->dev->name);
4354                 /* should be dev_kfree_skb_irq, but due to this function being
4355                  * named _irqsafe instead of just _irq we can't be sure that
4356                  * people won't call it from non-irq contexts */
4357                 dev_kfree_skb_any(skb);
4358                 return;
4359         }
4360         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
4361         /* copy pointer to saved status into skb->cb for use by tasklet */
4362         memcpy(skb->cb, &saved, sizeof(saved));
4363
4364         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
4365         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
4366                        &local->skb_queue : &local->skb_queue_unreliable, skb);
4367         tmp = skb_queue_len(&local->skb_queue) +
4368                 skb_queue_len(&local->skb_queue_unreliable);
4369         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
4370                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4371                 memcpy(&saved, skb->cb, sizeof(saved));
4372                 kfree(saved);
4373                 dev_kfree_skb_irq(skb);
4374                 tmp--;
4375                 I802_DEBUG_INC(local->tx_status_drop);
4376         }
4377         tasklet_schedule(&local->tasklet);
4378 }
4379 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
4380
4381 static void ieee80211_tasklet_handler(unsigned long data)
4382 {
4383         struct ieee80211_local *local = (struct ieee80211_local *) data;
4384         struct sk_buff *skb;
4385         struct ieee80211_rx_status rx_status;
4386         struct ieee80211_tx_status *tx_status;
4387
4388         while ((skb = skb_dequeue(&local->skb_queue)) ||
4389                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4390                 switch (skb->pkt_type) {
4391                 case IEEE80211_RX_MSG:
4392                         /* status is in skb->cb */
4393                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
4394                         /* Clear skb->type in order to not confuse kernel
4395                          * netstack. */
4396                         skb->pkt_type = 0;
4397                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
4398                         break;
4399                 case IEEE80211_TX_STATUS_MSG:
4400                         /* get pointer to saved status out of skb->cb */
4401                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
4402                         skb->pkt_type = 0;
4403                         ieee80211_tx_status(local_to_hw(local),
4404                                             skb, tx_status);
4405                         kfree(tx_status);
4406                         break;
4407                 default: /* should never get here! */
4408                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
4409                                local->mdev->name, skb->pkt_type);
4410                         dev_kfree_skb(skb);
4411                         break;
4412                 }
4413         }
4414 }
4415
4416
4417 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
4418  * make a prepared TX frame (one that has been given to hw) to look like brand
4419  * new IEEE 802.11 frame that is ready to go through TX processing again.
4420  * Also, tx_packet_data in cb is restored from tx_control. */
4421 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
4422                                       struct ieee80211_key *key,
4423                                       struct sk_buff *skb,
4424                                       struct ieee80211_tx_control *control)
4425 {
4426         int hdrlen, iv_len, mic_len;
4427         struct ieee80211_tx_packet_data *pkt_data;
4428
4429         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
4430         pkt_data->ifindex = control->ifindex;
4431         pkt_data->mgmt_iface = (control->type == IEEE80211_IF_TYPE_MGMT);
4432         pkt_data->req_tx_status = !!(control->flags & IEEE80211_TXCTL_REQ_TX_STATUS);
4433         pkt_data->do_not_encrypt = !!(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT);
4434         pkt_data->requeue = !!(control->flags & IEEE80211_TXCTL_REQUEUE);
4435         pkt_data->queue = control->queue;
4436
4437         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
4438
4439         if (!key)
4440                 goto no_key;
4441
4442         switch (key->alg) {
4443         case ALG_WEP:
4444                 iv_len = WEP_IV_LEN;
4445                 mic_len = WEP_ICV_LEN;
4446                 break;
4447         case ALG_TKIP:
4448                 iv_len = TKIP_IV_LEN;
4449                 mic_len = TKIP_ICV_LEN;
4450                 break;
4451         case ALG_CCMP:
4452                 iv_len = CCMP_HDR_LEN;
4453                 mic_len = CCMP_MIC_LEN;
4454                 break;
4455         default:
4456                 goto no_key;
4457         }
4458
4459         if (skb->len >= mic_len && key->force_sw_encrypt)
4460                 skb_trim(skb, skb->len - mic_len);
4461         if (skb->len >= iv_len && skb->len > hdrlen) {
4462                 memmove(skb->data + iv_len, skb->data, hdrlen);
4463                 skb_pull(skb, iv_len);
4464         }
4465
4466 no_key:
4467         {
4468                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4469                 u16 fc = le16_to_cpu(hdr->frame_control);
4470                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
4471                         fc &= ~IEEE80211_STYPE_QOS_DATA;
4472                         hdr->frame_control = cpu_to_le16(fc);
4473                         memmove(skb->data + 2, skb->data, hdrlen - 2);
4474                         skb_pull(skb, 2);
4475                 }
4476         }
4477 }
4478
4479
4480 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
4481                          struct ieee80211_tx_status *status)
4482 {
4483         struct sk_buff *skb2;
4484         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4485         struct ieee80211_local *local = hw_to_local(hw);
4486         u16 frag, type;
4487         u32 msg_type;
4488         struct ieee80211_tx_status_rtap_hdr *rthdr;
4489         struct ieee80211_sub_if_data *sdata;
4490         int monitors;
4491
4492         if (!status) {
4493                 printk(KERN_ERR
4494                        "%s: ieee80211_tx_status called with NULL status\n",
4495                        local->mdev->name);
4496                 dev_kfree_skb(skb);
4497                 return;
4498         }
4499
4500         if (status->excessive_retries) {
4501                 struct sta_info *sta;
4502                 sta = sta_info_get(local, hdr->addr1);
4503                 if (sta) {
4504                         if (sta->flags & WLAN_STA_PS) {
4505                                 /* The STA is in power save mode, so assume
4506                                  * that this TX packet failed because of that.
4507                                  */
4508                                 status->excessive_retries = 0;
4509                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
4510                         }
4511                         sta_info_put(sta);
4512                 }
4513         }
4514
4515         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
4516                 struct sta_info *sta;
4517                 sta = sta_info_get(local, hdr->addr1);
4518                 if (sta) {
4519                         sta->tx_filtered_count++;
4520
4521                         /* Clear the TX filter mask for this STA when sending
4522                          * the next packet. If the STA went to power save mode,
4523                          * this will happen when it is waking up for the next
4524                          * time. */
4525                         sta->clear_dst_mask = 1;
4526
4527                         /* TODO: Is the WLAN_STA_PS flag always set here or is
4528                          * the race between RX and TX status causing some
4529                          * packets to be filtered out before 80211.o gets an
4530                          * update for PS status? This seems to be the case, so
4531                          * no changes are likely to be needed. */
4532                         if (sta->flags & WLAN_STA_PS &&
4533                             skb_queue_len(&sta->tx_filtered) <
4534                             STA_MAX_TX_BUFFER) {
4535                                 ieee80211_remove_tx_extra(local, sta->key,
4536                                                           skb,
4537                                                           &status->control);
4538                                 skb_queue_tail(&sta->tx_filtered, skb);
4539                         } else if (!(sta->flags & WLAN_STA_PS) &&
4540                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
4541                                 /* Software retry the packet once */
4542                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
4543                                 ieee80211_remove_tx_extra(local, sta->key,
4544                                                           skb,
4545                                                           &status->control);
4546                                 dev_queue_xmit(skb);
4547                         } else {
4548                                 if (net_ratelimit()) {
4549                                         printk(KERN_DEBUG "%s: dropped TX "
4550                                                "filtered frame queue_len=%d "
4551                                                "PS=%d @%lu\n",
4552                                                local->mdev->name,
4553                                                skb_queue_len(
4554                                                        &sta->tx_filtered),
4555                                                !!(sta->flags & WLAN_STA_PS),
4556                                                jiffies);
4557                                 }
4558                                 dev_kfree_skb(skb);
4559                         }
4560                         sta_info_put(sta);
4561                         return;
4562                 }
4563         } else {
4564                 /* FIXME: STUPID to call this with both local and local->mdev */
4565                 rate_control_tx_status(local, local->mdev, skb, status);
4566         }
4567
4568         ieee80211_led_tx(local, 0);
4569
4570         /* SNMP counters
4571          * Fragments are passed to low-level drivers as separate skbs, so these
4572          * are actually fragments, not frames. Update frame counters only for
4573          * the first fragment of the frame. */
4574
4575         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
4576         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
4577
4578         if (status->flags & IEEE80211_TX_STATUS_ACK) {
4579                 if (frag == 0) {
4580                         local->dot11TransmittedFrameCount++;
4581                         if (is_multicast_ether_addr(hdr->addr1))
4582                                 local->dot11MulticastTransmittedFrameCount++;
4583                         if (status->retry_count > 0)
4584                                 local->dot11RetryCount++;
4585                         if (status->retry_count > 1)
4586                                 local->dot11MultipleRetryCount++;
4587                 }
4588
4589                 /* This counter shall be incremented for an acknowledged MPDU
4590                  * with an individual address in the address 1 field or an MPDU
4591                  * with a multicast address in the address 1 field of type Data
4592                  * or Management. */
4593                 if (!is_multicast_ether_addr(hdr->addr1) ||
4594                     type == IEEE80211_FTYPE_DATA ||
4595                     type == IEEE80211_FTYPE_MGMT)
4596                         local->dot11TransmittedFragmentCount++;
4597         } else {
4598                 if (frag == 0)
4599                         local->dot11FailedCount++;
4600         }
4601
4602         msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
4603                 ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
4604
4605         /* this was a transmitted frame, but now we want to reuse it */
4606         skb_orphan(skb);
4607
4608         if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
4609             local->apdev) {
4610                 if (local->monitors) {
4611                         skb2 = skb_clone(skb, GFP_ATOMIC);
4612                 } else {
4613                         skb2 = skb;
4614                         skb = NULL;
4615                 }
4616
4617                 if (skb2)
4618                         /* Send frame to hostapd */
4619                         ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
4620
4621                 if (!skb)
4622                         return;
4623         }
4624
4625         if (!local->monitors) {
4626                 dev_kfree_skb(skb);
4627                 return;
4628         }
4629
4630         /* send frame to monitor interfaces now */
4631
4632         if (skb_headroom(skb) < sizeof(*rthdr)) {
4633                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
4634                 dev_kfree_skb(skb);
4635                 return;
4636         }
4637
4638         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
4639                                 skb_push(skb, sizeof(*rthdr));
4640
4641         memset(rthdr, 0, sizeof(*rthdr));
4642         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
4643         rthdr->hdr.it_present =
4644                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
4645                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
4646
4647         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
4648             !is_multicast_ether_addr(hdr->addr1))
4649                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
4650
4651         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
4652             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
4653                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
4654         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
4655                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
4656
4657         rthdr->data_retries = status->retry_count;
4658
4659         read_lock(&local->sub_if_lock);
4660         monitors = local->monitors;
4661         list_for_each_entry(sdata, &local->sub_if_list, list) {
4662                 /*
4663                  * Using the monitors counter is possibly racy, but
4664                  * if the value is wrong we simply either clone the skb
4665                  * once too much or forget sending it to one monitor iface
4666                  * The latter case isn't nice but fixing the race is much
4667                  * more complicated.
4668                  */
4669                 if (!monitors || !skb)
4670                         goto out;
4671
4672                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
4673                         if (!netif_running(sdata->dev))
4674                                 continue;
4675                         monitors--;
4676                         if (monitors)
4677                                 skb2 = skb_clone(skb, GFP_KERNEL);
4678                         else
4679                                 skb2 = NULL;
4680                         skb->dev = sdata->dev;
4681                         /* XXX: is this sufficient for BPF? */
4682                         skb_set_mac_header(skb, 0);
4683                         skb->ip_summed = CHECKSUM_UNNECESSARY;
4684                         skb->pkt_type = PACKET_OTHERHOST;
4685                         skb->protocol = htons(ETH_P_802_2);
4686                         memset(skb->cb, 0, sizeof(skb->cb));
4687                         netif_rx(skb);
4688                         skb = skb2;
4689                         break;
4690                 }
4691         }
4692  out:
4693         read_unlock(&local->sub_if_lock);
4694         if (skb)
4695                 dev_kfree_skb(skb);
4696 }
4697 EXPORT_SYMBOL(ieee80211_tx_status);
4698
4699 /* TODO: implement register/unregister functions for adding TX/RX handlers
4700  * into ordered list */
4701
4702 /* rx_pre handlers don't have dev and sdata fields available in
4703  * ieee80211_txrx_data */
4704 static ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
4705 {
4706         ieee80211_rx_h_parse_qos,
4707         ieee80211_rx_h_load_stats,
4708         NULL
4709 };
4710
4711 static ieee80211_rx_handler ieee80211_rx_handlers[] =
4712 {
4713         ieee80211_rx_h_if_stats,
4714         ieee80211_rx_h_monitor,
4715         ieee80211_rx_h_passive_scan,
4716         ieee80211_rx_h_check,
4717         ieee80211_rx_h_sta_process,
4718         ieee80211_rx_h_ccmp_decrypt,
4719         ieee80211_rx_h_tkip_decrypt,
4720         ieee80211_rx_h_wep_weak_iv_detection,
4721         ieee80211_rx_h_wep_decrypt,
4722         ieee80211_rx_h_defragment,
4723         ieee80211_rx_h_ps_poll,
4724         ieee80211_rx_h_michael_mic_verify,
4725         /* this must be after decryption - so header is counted in MPDU mic
4726          * must be before pae and data, so QOS_DATA format frames
4727          * are not passed to user space by these functions
4728          */
4729         ieee80211_rx_h_remove_qos_control,
4730         ieee80211_rx_h_802_1x_pae,
4731         ieee80211_rx_h_drop_unencrypted,
4732         ieee80211_rx_h_data,
4733         ieee80211_rx_h_mgmt,
4734         NULL
4735 };
4736
4737 static ieee80211_tx_handler ieee80211_tx_handlers[] =
4738 {
4739         ieee80211_tx_h_check_assoc,
4740         ieee80211_tx_h_sequence,
4741         ieee80211_tx_h_ps_buf,
4742         ieee80211_tx_h_select_key,
4743         ieee80211_tx_h_michael_mic_add,
4744         ieee80211_tx_h_fragment,
4745         ieee80211_tx_h_tkip_encrypt,
4746         ieee80211_tx_h_ccmp_encrypt,
4747         ieee80211_tx_h_wep_encrypt,
4748         ieee80211_tx_h_rate_ctrl,
4749         ieee80211_tx_h_misc,
4750         ieee80211_tx_h_load_stats,
4751         NULL
4752 };
4753
4754
4755 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
4756 {
4757         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4758         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4759         struct sta_info *sta;
4760
4761         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
4762                 return 0;
4763
4764         /* Create STA entry for the new peer */
4765         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
4766         if (!sta)
4767                 return -ENOMEM;
4768         sta_info_put(sta);
4769
4770         /* Remove STA entry for the old peer */
4771         sta = sta_info_get(local, sdata->u.wds.remote_addr);
4772         if (sta) {
4773                 sta_info_put(sta);
4774                 sta_info_free(sta, 0);
4775         } else {
4776                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
4777                        "peer " MAC_FMT "\n",
4778                        dev->name, MAC_ARG(sdata->u.wds.remote_addr));
4779         }
4780
4781         /* Update WDS link data */
4782         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
4783
4784         return 0;
4785 }
4786
4787 /* Must not be called for mdev and apdev */
4788 void ieee80211_if_setup(struct net_device *dev)
4789 {
4790         ether_setup(dev);
4791         dev->hard_start_xmit = ieee80211_subif_start_xmit;
4792         dev->wireless_handlers = &ieee80211_iw_handler_def;
4793         dev->set_multicast_list = ieee80211_set_multicast_list;
4794         dev->change_mtu = ieee80211_change_mtu;
4795         dev->get_stats = ieee80211_get_stats;
4796         dev->open = ieee80211_open;
4797         dev->stop = ieee80211_stop;
4798         dev->uninit = ieee80211_if_reinit;
4799         dev->destructor = ieee80211_if_free;
4800 }
4801
4802 void ieee80211_if_mgmt_setup(struct net_device *dev)
4803 {
4804         ether_setup(dev);
4805         dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
4806         dev->change_mtu = ieee80211_change_mtu_apdev;
4807         dev->get_stats = ieee80211_get_stats;
4808         dev->open = ieee80211_mgmt_open;
4809         dev->stop = ieee80211_mgmt_stop;
4810         dev->type = ARPHRD_IEEE80211_PRISM;
4811         dev->hard_header_parse = header_parse_80211;
4812         dev->uninit = ieee80211_if_reinit;
4813         dev->destructor = ieee80211_if_free;
4814 }
4815
4816 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
4817                                  const char *name)
4818 {
4819         struct rate_control_ref *ref, *old;
4820
4821         ASSERT_RTNL();
4822         if (local->open_count || netif_running(local->mdev) ||
4823             (local->apdev && netif_running(local->apdev)))
4824                 return -EBUSY;
4825
4826         ref = rate_control_alloc(name, local);
4827         if (!ref) {
4828                 printk(KERN_WARNING "%s: Failed to select rate control "
4829                        "algorithm\n", local->mdev->name);
4830                 return -ENOENT;
4831         }
4832
4833         old = local->rate_ctrl;
4834         local->rate_ctrl = ref;
4835         if (old) {
4836                 rate_control_put(old);
4837                 sta_info_flush(local, NULL);
4838         }
4839
4840         printk(KERN_DEBUG "%s: Selected rate control "
4841                "algorithm '%s'\n", local->mdev->name,
4842                ref->ops->name);
4843
4844
4845         return 0;
4846 }
4847
4848 static void rate_control_deinitialize(struct ieee80211_local *local)
4849 {
4850         struct rate_control_ref *ref;
4851
4852         ref = local->rate_ctrl;
4853         local->rate_ctrl = NULL;
4854         rate_control_put(ref);
4855 }
4856
4857 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
4858                                         const struct ieee80211_ops *ops)
4859 {
4860         struct net_device *mdev;
4861         struct ieee80211_local *local;
4862         struct ieee80211_sub_if_data *sdata;
4863         int priv_size;
4864         struct wiphy *wiphy;
4865
4866         /* Ensure 32-byte alignment of our private data and hw private data.
4867          * We use the wiphy priv data for both our ieee80211_local and for
4868          * the driver's private data
4869          *
4870          * In memory it'll be like this:
4871          *
4872          * +-------------------------+
4873          * | struct wiphy           |
4874          * +-------------------------+
4875          * | struct ieee80211_local  |
4876          * +-------------------------+
4877          * | driver's private data   |
4878          * +-------------------------+
4879          *
4880          */
4881         priv_size = ((sizeof(struct ieee80211_local) +
4882                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
4883                     priv_data_len;
4884
4885         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
4886
4887         if (!wiphy)
4888                 return NULL;
4889
4890         wiphy->privid = mac80211_wiphy_privid;
4891
4892         local = wiphy_priv(wiphy);
4893         local->hw.wiphy = wiphy;
4894
4895         local->hw.priv = (char *)local +
4896                          ((sizeof(struct ieee80211_local) +
4897                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4898
4899         local->ops = ops;
4900
4901         /* for now, mdev needs sub_if_data :/ */
4902         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
4903                             "wmaster%d", ether_setup);
4904         if (!mdev) {
4905                 wiphy_free(wiphy);
4906                 return NULL;
4907         }
4908
4909         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
4910         mdev->ieee80211_ptr = &sdata->wdev;
4911         sdata->wdev.wiphy = wiphy;
4912
4913         local->hw.queues = 1; /* default */
4914
4915         local->mdev = mdev;
4916         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
4917         local->rx_handlers = ieee80211_rx_handlers;
4918         local->tx_handlers = ieee80211_tx_handlers;
4919
4920         local->bridge_packets = 1;
4921
4922         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
4923         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
4924         local->short_retry_limit = 7;
4925         local->long_retry_limit = 4;
4926         local->hw.conf.radio_enabled = 1;
4927
4928         local->enabled_modes = (unsigned int) -1;
4929
4930         INIT_LIST_HEAD(&local->modes_list);
4931
4932         rwlock_init(&local->sub_if_lock);
4933         INIT_LIST_HEAD(&local->sub_if_list);
4934
4935         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
4936         init_timer(&local->stat_timer);
4937         local->stat_timer.function = ieee80211_stat_refresh;
4938         local->stat_timer.data = (unsigned long) local;
4939         ieee80211_rx_bss_list_init(mdev);
4940
4941         sta_info_init(local);
4942
4943         mdev->hard_start_xmit = ieee80211_master_start_xmit;
4944         mdev->open = ieee80211_master_open;
4945         mdev->stop = ieee80211_master_stop;
4946         mdev->type = ARPHRD_IEEE80211;
4947         mdev->hard_header_parse = header_parse_80211;
4948
4949         sdata->type = IEEE80211_IF_TYPE_AP;
4950         sdata->dev = mdev;
4951         sdata->local = local;
4952         sdata->u.ap.force_unicast_rateidx = -1;
4953         sdata->u.ap.max_ratectrl_rateidx = -1;
4954         ieee80211_if_sdata_init(sdata);
4955         list_add_tail(&sdata->list, &local->sub_if_list);
4956
4957         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
4958                      (unsigned long)local);
4959         tasklet_disable(&local->tx_pending_tasklet);
4960
4961         tasklet_init(&local->tasklet,
4962                      ieee80211_tasklet_handler,
4963                      (unsigned long) local);
4964         tasklet_disable(&local->tasklet);
4965
4966         skb_queue_head_init(&local->skb_queue);
4967         skb_queue_head_init(&local->skb_queue_unreliable);
4968
4969         return local_to_hw(local);
4970 }
4971 EXPORT_SYMBOL(ieee80211_alloc_hw);
4972
4973 int ieee80211_register_hw(struct ieee80211_hw *hw)
4974 {
4975         struct ieee80211_local *local = hw_to_local(hw);
4976         const char *name;
4977         int result;
4978
4979         result = wiphy_register(local->hw.wiphy);
4980         if (result < 0)
4981                 return result;
4982
4983         name = wiphy_dev(local->hw.wiphy)->driver->name;
4984         local->hw.workqueue = create_singlethread_workqueue(name);
4985         if (!local->hw.workqueue) {
4986                 result = -ENOMEM;
4987                 goto fail_workqueue;
4988         }
4989
4990         /*
4991          * The hardware needs headroom for sending the frame,
4992          * and we need some headroom for passing the frame to monitor
4993          * interfaces, but never both at the same time.
4994          */
4995         local->tx_headroom = max(local->hw.extra_tx_headroom,
4996                                  sizeof(struct ieee80211_tx_status_rtap_hdr));
4997
4998         debugfs_hw_add(local);
4999
5000         local->hw.conf.beacon_int = 1000;
5001
5002         local->wstats_flags |= local->hw.max_rssi ?
5003                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
5004         local->wstats_flags |= local->hw.max_signal ?
5005                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
5006         local->wstats_flags |= local->hw.max_noise ?
5007                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
5008         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
5009                 local->wstats_flags |= IW_QUAL_DBM;
5010
5011         result = sta_info_start(local);
5012         if (result < 0)
5013                 goto fail_sta_info;
5014
5015         rtnl_lock();
5016         result = dev_alloc_name(local->mdev, local->mdev->name);
5017         if (result < 0)
5018                 goto fail_dev;
5019
5020         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
5021         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
5022
5023         result = register_netdevice(local->mdev);
5024         if (result < 0)
5025                 goto fail_dev;
5026
5027         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5028
5029         result = ieee80211_init_rate_ctrl_alg(local, NULL);
5030         if (result < 0) {
5031                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
5032                        "algorithm\n", local->mdev->name);
5033                 goto fail_rate;
5034         }
5035
5036         result = ieee80211_wep_init(local);
5037
5038         if (result < 0) {
5039                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
5040                        local->mdev->name);
5041                 goto fail_wep;
5042         }
5043
5044         ieee80211_install_qdisc(local->mdev);
5045
5046         /* add one default STA interface */
5047         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
5048                                   IEEE80211_IF_TYPE_STA);
5049         if (result)
5050                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
5051                        local->mdev->name);
5052
5053         local->reg_state = IEEE80211_DEV_REGISTERED;
5054         rtnl_unlock();
5055
5056         ieee80211_led_init(local);
5057
5058         return 0;
5059
5060 fail_wep:
5061         rate_control_deinitialize(local);
5062 fail_rate:
5063         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5064         unregister_netdevice(local->mdev);
5065 fail_dev:
5066         rtnl_unlock();
5067         sta_info_stop(local);
5068 fail_sta_info:
5069         debugfs_hw_del(local);
5070         destroy_workqueue(local->hw.workqueue);
5071 fail_workqueue:
5072         wiphy_unregister(local->hw.wiphy);
5073         return result;
5074 }
5075 EXPORT_SYMBOL(ieee80211_register_hw);
5076
5077 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
5078                               struct ieee80211_hw_mode *mode)
5079 {
5080         struct ieee80211_local *local = hw_to_local(hw);
5081         struct ieee80211_rate *rate;
5082         int i;
5083
5084         INIT_LIST_HEAD(&mode->list);
5085         list_add_tail(&mode->list, &local->modes_list);
5086
5087         local->hw_modes |= (1 << mode->mode);
5088         for (i = 0; i < mode->num_rates; i++) {
5089                 rate = &(mode->rates[i]);
5090                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
5091         }
5092         ieee80211_prepare_rates(local, mode);
5093
5094         if (!local->oper_hw_mode) {
5095                 /* Default to this mode */
5096                 local->hw.conf.phymode = mode->mode;
5097                 local->oper_hw_mode = local->scan_hw_mode = mode;
5098                 local->oper_channel = local->scan_channel = &mode->channels[0];
5099                 local->hw.conf.mode = local->oper_hw_mode;
5100                 local->hw.conf.chan = local->oper_channel;
5101         }
5102
5103         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
5104                 ieee80211_init_client(local->mdev);
5105
5106         return 0;
5107 }
5108 EXPORT_SYMBOL(ieee80211_register_hwmode);
5109
5110 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
5111 {
5112         struct ieee80211_local *local = hw_to_local(hw);
5113         struct ieee80211_sub_if_data *sdata, *tmp;
5114         struct list_head tmp_list;
5115         int i;
5116
5117         tasklet_kill(&local->tx_pending_tasklet);
5118         tasklet_kill(&local->tasklet);
5119
5120         rtnl_lock();
5121
5122         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
5123
5124         local->reg_state = IEEE80211_DEV_UNREGISTERED;
5125         if (local->apdev)
5126                 ieee80211_if_del_mgmt(local);
5127
5128         write_lock_bh(&local->sub_if_lock);
5129         list_replace_init(&local->sub_if_list, &tmp_list);
5130         write_unlock_bh(&local->sub_if_lock);
5131
5132         list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
5133                 __ieee80211_if_del(local, sdata);
5134
5135         rtnl_unlock();
5136
5137         if (local->stat_time)
5138                 del_timer_sync(&local->stat_timer);
5139
5140         ieee80211_rx_bss_list_deinit(local->mdev);
5141         ieee80211_clear_tx_pending(local);
5142         sta_info_stop(local);
5143         rate_control_deinitialize(local);
5144         debugfs_hw_del(local);
5145
5146         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
5147                 kfree(local->supp_rates[i]);
5148                 kfree(local->basic_rates[i]);
5149         }
5150
5151         if (skb_queue_len(&local->skb_queue)
5152                         || skb_queue_len(&local->skb_queue_unreliable))
5153                 printk(KERN_WARNING "%s: skb_queue not empty\n",
5154                        local->mdev->name);
5155         skb_queue_purge(&local->skb_queue);
5156         skb_queue_purge(&local->skb_queue_unreliable);
5157
5158         destroy_workqueue(local->hw.workqueue);
5159         wiphy_unregister(local->hw.wiphy);
5160         ieee80211_wep_free(local);
5161         ieee80211_led_exit(local);
5162 }
5163 EXPORT_SYMBOL(ieee80211_unregister_hw);
5164
5165 void ieee80211_free_hw(struct ieee80211_hw *hw)
5166 {
5167         struct ieee80211_local *local = hw_to_local(hw);
5168
5169         ieee80211_if_free(local->mdev);
5170         wiphy_free(local->hw.wiphy);
5171 }
5172 EXPORT_SYMBOL(ieee80211_free_hw);
5173
5174 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
5175 {
5176         struct ieee80211_local *local = hw_to_local(hw);
5177
5178         if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
5179                                &local->state[queue])) {
5180                 if (test_bit(IEEE80211_LINK_STATE_PENDING,
5181                              &local->state[queue]))
5182                         tasklet_schedule(&local->tx_pending_tasklet);
5183                 else
5184                         if (!ieee80211_qdisc_installed(local->mdev)) {
5185                                 if (queue == 0)
5186                                         netif_wake_queue(local->mdev);
5187                         } else
5188                                 __netif_schedule(local->mdev);
5189         }
5190 }
5191 EXPORT_SYMBOL(ieee80211_wake_queue);
5192
5193 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
5194 {
5195         struct ieee80211_local *local = hw_to_local(hw);
5196
5197         if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
5198                 netif_stop_queue(local->mdev);
5199         set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
5200 }
5201 EXPORT_SYMBOL(ieee80211_stop_queue);
5202
5203 void ieee80211_start_queues(struct ieee80211_hw *hw)
5204 {
5205         struct ieee80211_local *local = hw_to_local(hw);
5206         int i;
5207
5208         for (i = 0; i < local->hw.queues; i++)
5209                 clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
5210         if (!ieee80211_qdisc_installed(local->mdev))
5211                 netif_start_queue(local->mdev);
5212 }
5213 EXPORT_SYMBOL(ieee80211_start_queues);
5214
5215 void ieee80211_stop_queues(struct ieee80211_hw *hw)
5216 {
5217         int i;
5218
5219         for (i = 0; i < hw->queues; i++)
5220                 ieee80211_stop_queue(hw, i);
5221 }
5222 EXPORT_SYMBOL(ieee80211_stop_queues);
5223
5224 void ieee80211_wake_queues(struct ieee80211_hw *hw)
5225 {
5226         int i;
5227
5228         for (i = 0; i < hw->queues; i++)
5229                 ieee80211_wake_queue(hw, i);
5230 }
5231 EXPORT_SYMBOL(ieee80211_wake_queues);
5232
5233 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
5234 {
5235         struct ieee80211_sub_if_data *sdata;
5236         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5237         return &sdata->stats;
5238 }
5239
5240 static int __init ieee80211_init(void)
5241 {
5242         struct sk_buff *skb;
5243         int ret;
5244
5245         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
5246
5247         ret = ieee80211_wme_register();
5248         if (ret) {
5249                 printk(KERN_DEBUG "ieee80211_init: failed to "
5250                        "initialize WME (err=%d)\n", ret);
5251                 return ret;
5252         }
5253
5254         ieee80211_debugfs_netdev_init();
5255
5256         return 0;
5257 }
5258
5259
5260 static void __exit ieee80211_exit(void)
5261 {
5262         ieee80211_wme_unregister();
5263         ieee80211_debugfs_netdev_exit();
5264 }
5265
5266
5267 module_init(ieee80211_init);
5268 module_exit(ieee80211_exit);
5269
5270 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
5271 MODULE_LICENSE("GPL");