drivers/staging/rtl8192e/rtllib_tx.c

   1 /******************************************************************************
   2
   3   Copyright(c) 2003 - 2004 Intel Corporation. All rights reserved.
   4
   5   This program is free software; you can redistribute it and/or modify it
   6   under the terms of version 2 of the GNU General Public License as
   7   published by the Free Software Foundation.
   8
   9   This program is distributed in the hope that it will be useful, but WITHOUT
  10   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12   more details.
  13
  14   You should have received a copy of the GNU General Public License along with
  15   this program; if not, write to the Free Software Foundation, Inc., 59
  16   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17
  18   The full GNU General Public License is included in this distribution in the
  19   file called LICENSE.
  20
  21   Contact Information:
  22   James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24
  25 ******************************************************************************
  26
  27   Few modifications for Realtek's Wi-Fi drivers by
  28   Andrea Merello <andrea.merello@gmail.com>
  29
  30   A special thanks goes to Realtek for their support !
  31
  32 ******************************************************************************/
  33
  34 #include <linux/compiler.h>
  35 #include <linux/errno.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/in6.h>
  38 #include <linux/in.h>
  39 #include <linux/ip.h>
  40 #include <linux/kernel.h>
  41 #include <linux/module.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/pci.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/slab.h>
  47 #include <linux/tcp.h>
  48 #include <linux/types.h>
  49 #include <linux/wireless.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/uaccess.h>
  52 #include <linux/if_vlan.h>
  53
  54 #include "rtllib.h"
  55
  56 /* 802.11 Data Frame
  57  *
  58  *
  59  * 802.11 frame_control for data frames - 2 bytes
  60  *      ,--------------------------------------------------------------------.
  61  * bits | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |  9 |  a |  b  |  c  |  d  | e  |
  62  *      |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----|
  63  * val  | 0 | 0 | 0 | 1 | x | 0 | 0 | 0 | 1 |  0 |  x |  x  |  x  |  x  | x  |
  64  *      |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----|
  65  * desc |  ver  | type  |  ^-subtype-^  |to |from|more|retry| pwr |more |wep |
  66  *      |       |       | x=0 data      |DS | DS |frag|     | mgm |data |    |
  67  *      |       |       | x=1 data+ack  |   |    |    |     |     |     |    |
  68  *      '--------------------------------------------------------------------'
  69  *                                           /\
  70  *                                           |
  71  * 802.11 Data Frame                         |
  72  *          ,--------- 'ctrl' expands to >---'
  73  *          |
  74  *       ,--'---,-------------------------------------------------------------.
  75  * Bytes |  2   |  2   |    6    |    6    |    6    |  2   | 0..2312 |   4  |
  76  *       |------|------|---------|---------|---------|------|---------|------|
  77  * Desc. | ctrl | dura |  DA/RA  |   TA    |    SA   | Sequ |  Frame  |  fcs |
  78  *       |      | tion | (BSSID) |         |         | ence |  data   |      |
  79  *       `--------------------------------------------------|         |------'
  80  * Total: 28 non-data bytes                                 `----.----'
  81  *                                                               |
  82  *        .- 'Frame data' expands to <---------------------------'
  83  *        |
  84  *        V
  85  *       ,---------------------------------------------------.
  86  * Bytes |  1   |  1   |    1    |    3     |  2   |  0-2304 |
  87  *       |------|------|---------|----------|------|---------|
  88  * Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP      |
  89  *       | DSAP | SSAP |         |          |      | Packet  |
  90  *       | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8|      |         |
  91  *       `-----------------------------------------|         |
  92  * Total: 8 non-data bytes                         `----.----'
  93  *                                                      |
  94  *        .- 'IP Packet' expands, if WEP enabled, to <--'
  95  *        |
  96  *        V
  97  *       ,-----------------------.
  98  * Bytes |  4  |   0-2296  |  4  |
  99  *       |-----|-----------|-----|
 100  * Desc. | IV  | Encrypted | ICV |
 101  *       |     | IP Packet |     |
 102  *       `-----------------------'
 103  * Total: 8 non-data bytes
 104  *
 105  *
 106  * 802.3 Ethernet Data Frame
 107  *
 108  *       ,-----------------------------------------.
 109  * Bytes |   6   |   6   |  2   |  Variable |   4  |
 110  *       |-------|-------|------|-----------|------|
 111  * Desc. | Dest. | Source| Type | IP Packet |  fcs |
 112  *       |  MAC  |  MAC  |      |          |      |
 113  *       `-----------------------------------------'
 114  * Total: 18 non-data bytes
 115  *
 116  * In the event that fragmentation is required, the incoming payload is split
 117  * into N parts of size ieee->fts.  The first fragment contains the SNAP header
 118  * and the remaining packets are just data.
 119  *
 120  * If encryption is enabled, each fragment payload size is reduced by enough
 121  * space to add the prefix and postfix (IV and ICV totalling 8 bytes in
 122  * the case of WEP) So if you have 1500 bytes of payload with ieee->fts set to
 123  * 500 without encryption it will take 3 frames.  With WEP it will take 4 frames
 124  * as the payload of each frame is reduced to 492 bytes.
 125  *
 126  * SKB visualization
 127  *
 128  * ,- skb->data
 129  * |
 130  * |    ETHERNET HEADER        ,-<-- PAYLOAD
 131  * |                           |     14 bytes from skb->data
 132  * |  2 bytes for Type --> ,T. |     (sizeof ethhdr)
 133  * |                       | | |
 134  * |,-Dest.--. ,--Src.---. | | |
 135  * |  6 bytes| | 6 bytes | | | |
 136  * v         | |         | | | |
 137  * 0         | v       1 | v | v           2
 138  * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
 139  *     ^     | ^         | ^ |
 140  *     |     | |         | | |
 141  *     |     | |         | `T' <---- 2 bytes for Type
 142  *     |     | |         |
 143  *     |     | '---SNAP--' <-------- 6 bytes for SNAP
 144  *     |     |
 145  *     `-IV--' <-------------------- 4 bytes for IV (WEP)
 146  *
 147  *      SNAP HEADER
 148  *
 149  */
 150
 151 static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
 152 static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };
 153
 154 inline int rtllib_put_snap(u8 *data, u16 h_proto)
 155 {
 156         struct rtllib_snap_hdr *snap;
 157         u8 *oui;
 158
 159         snap = (struct rtllib_snap_hdr *)data;
 160         snap->dsap = 0xaa;
 161         snap->ssap = 0xaa;
 162         snap->ctrl = 0x03;
 163
 164         if (h_proto == 0x8137 || h_proto == 0x80f3)
 165                 oui = P802_1H_OUI;
 166         else
 167                 oui = RFC1042_OUI;
 168         snap->oui[0] = oui[0];
 169         snap->oui[1] = oui[1];
 170         snap->oui[2] = oui[2];
 171
 172         *(__be16 *)(data + SNAP_SIZE) = htons(h_proto);
 173
 174         return SNAP_SIZE + sizeof(u16);
 175 }
 176
 177 int rtllib_encrypt_fragment(struct rtllib_device *ieee, struct sk_buff *frag,
 178                             int hdr_len)
 179 {
 180         struct lib80211_crypt_data *crypt = NULL;
 181         int res;
 182
 183         crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
 184
 185         if (!(crypt && crypt->ops)) {
 186                 netdev_info(ieee->dev, "=========>%s(), crypt is null\n",
 187                             __func__);
 188                 return -1;
 189         }
 190         /* To encrypt, frame format is:
 191          * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes)
 192          */
 193
 194         /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
 195          * call both MSDU and MPDU encryption functions from here.
 196          */
 197         atomic_inc(&crypt->refcnt);
 198         res = 0;
 199         if (crypt->ops->encrypt_msdu)
 200                 res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv);
 201         if (res == 0 && crypt->ops->encrypt_mpdu)
 202                 res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);
 203
 204         atomic_dec(&crypt->refcnt);
 205         if (res < 0) {
 206                 netdev_info(ieee->dev, "%s: Encryption failed: len=%d.\n",
 207                             ieee->dev->name, frag->len);
 208                 ieee->ieee_stats.tx_discards++;
 209                 return -1;
 210         }
 211
 212         return 0;
 213 }
 214
 215
 216 void rtllib_txb_free(struct rtllib_txb *txb)
 217 {
 218         if (unlikely(!txb))
 219                 return;
 220         kfree(txb);
 221 }
 222
 223 static struct rtllib_txb *rtllib_alloc_txb(int nr_frags, int txb_size,
 224                                            gfp_t gfp_mask)
 225 {
 226         struct rtllib_txb *txb;
 227         int i;
 228
 229         txb = kmalloc(sizeof(struct rtllib_txb) + (sizeof(u8 *) * nr_frags),
 230                       gfp_mask);
 231         if (!txb)
 232                 return NULL;
 233
 234         memset(txb, 0, sizeof(struct rtllib_txb));
 235         txb->nr_frags = nr_frags;
 236         txb->frag_size = cpu_to_le16(txb_size);
 237
 238         for (i = 0; i < nr_frags; i++) {
 239                 txb->fragments[i] = dev_alloc_skb(txb_size);
 240                 if (unlikely(!txb->fragments[i])) {
 241                         i--;
 242                         break;
 243                 }
 244                 memset(txb->fragments[i]->cb, 0, sizeof(txb->fragments[i]->cb));
 245         }
 246         if (unlikely(i != nr_frags)) {
 247                 while (i >= 0)
 248                         dev_kfree_skb_any(txb->fragments[i--]);
 249                 kfree(txb);
 250                 return NULL;
 251         }
 252         return txb;
 253 }
 254
 255 static int rtllib_classify(struct sk_buff *skb, u8 bIsAmsdu)
 256 {
 257         struct ethhdr *eth;
 258         struct iphdr *ip;
 259
 260         eth = (struct ethhdr *)skb->data;
 261         if (eth->h_proto != htons(ETH_P_IP))
 262                 return 0;
 263
 264 #ifdef VERBOSE_DEBUG
 265         print_hex_dump_bytes("rtllib_classify(): ", DUMP_PREFIX_NONE, skb->data,
 266                              skb->len);
 267 #endif
 268         ip = ip_hdr(skb);
 269         switch (ip->tos & 0xfc) {
 270         case 0x20:
 271                 return 2;
 272         case 0x40:
 273                 return 1;
 274         case 0x60:
 275                 return 3;
 276         case 0x80:
 277                 return 4;
 278         case 0xa0:
 279                 return 5;
 280         case 0xc0:
 281                 return 6;
 282         case 0xe0:
 283                 return 7;
 284         default:
 285                 return 0;
 286         }
 287 }
 288
 289 static void rtllib_tx_query_agg_cap(struct rtllib_device *ieee,
 290                                     struct sk_buff *skb,
 291                                     struct cb_desc *tcb_desc)
 292 {
 293         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 294         struct tx_ts_record *pTxTs = NULL;
 295         struct rtllib_hdr_1addr *hdr = (struct rtllib_hdr_1addr *)skb->data;
 296
 297         if (rtllib_act_scanning(ieee, false))
 298                 return;
 299
 300         if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 301                 return;
 302         if (!IsQoSDataFrame(skb->data))
 303                 return;
 304         if (is_multicast_ether_addr(hdr->addr1))
 305                 return;
 306
 307         if (tcb_desc->bdhcp || ieee->CntAfterLink < 2)
 308                 return;
 309
 310         if (pHTInfo->IOTAction & HT_IOT_ACT_TX_NO_AGGREGATION)
 311                 return;
 312
 313         if (!ieee->GetNmodeSupportBySecCfg(ieee->dev))
 314                 return;
 315         if (pHTInfo->bCurrentAMPDUEnable) {
 316                 if (!GetTs(ieee, (struct ts_common_info **)(&pTxTs), hdr->addr1,
 317                     skb->priority, TX_DIR, true)) {
 318                         netdev_info(ieee->dev, "%s: can't get TS\n", __func__);
 319                         return;
 320                 }
 321                 if (pTxTs->TxAdmittedBARecord.bValid == false) {
 322                         if (ieee->wpa_ie_len && (ieee->pairwise_key_type ==
 323                             KEY_TYPE_NA)) {
 324                                 ;
 325                         } else if (tcb_desc->bdhcp == 1) {
 326                                 ;
 327                         } else if (!pTxTs->bDisable_AddBa) {
 328                                 TsStartAddBaProcess(ieee, pTxTs);
 329                         }
 330                         goto FORCED_AGG_SETTING;
 331                 } else if (pTxTs->bUsingBa == false) {
 332                         if (SN_LESS(pTxTs->TxAdmittedBARecord.BaStartSeqCtrl.field.SeqNum,
 333                            (pTxTs->TxCurSeq+1)%4096))
 334                                 pTxTs->bUsingBa = true;
 335                         else
 336                                 goto FORCED_AGG_SETTING;
 337                 }
 338                 if (ieee->iw_mode == IW_MODE_INFRA) {
 339                         tcb_desc->bAMPDUEnable = true;
 340                         tcb_desc->ampdu_factor = pHTInfo->CurrentAMPDUFactor;
 341                         tcb_desc->ampdu_density = pHTInfo->CurrentMPDUDensity;
 342                 }
 343         }
 344 FORCED_AGG_SETTING:
 345         switch (pHTInfo->ForcedAMPDUMode) {
 346         case HT_AGG_AUTO:
 347                 break;
 348
 349         case HT_AGG_FORCE_ENABLE:
 350                 tcb_desc->bAMPDUEnable = true;
 351                 tcb_desc->ampdu_density = pHTInfo->ForcedMPDUDensity;
 352                 tcb_desc->ampdu_factor = pHTInfo->ForcedAMPDUFactor;
 353                 break;
 354
 355         case HT_AGG_FORCE_DISABLE:
 356                 tcb_desc->bAMPDUEnable = false;
 357                 tcb_desc->ampdu_density = 0;
 358                 tcb_desc->ampdu_factor = 0;
 359                 break;
 360         }
 361 }
 362
 363 static void rtllib_qurey_ShortPreambleMode(struct rtllib_device *ieee,
 364                                            struct cb_desc *tcb_desc)
 365 {
 366         tcb_desc->bUseShortPreamble = false;
 367         if (tcb_desc->data_rate == 2)
 368                 return;
 369         else if (ieee->current_network.capability &
 370                  WLAN_CAPABILITY_SHORT_PREAMBLE)
 371                 tcb_desc->bUseShortPreamble = true;
 372 }
 373
 374 static void rtllib_query_HTCapShortGI(struct rtllib_device *ieee,
 375                                       struct cb_desc *tcb_desc)
 376 {
 377         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 378
 379         tcb_desc->bUseShortGI           = false;
 380
 381         if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 382                 return;
 383
 384         if (pHTInfo->bForcedShortGI) {
 385                 tcb_desc->bUseShortGI = true;
 386                 return;
 387         }
 388
 389         if ((pHTInfo->bCurBW40MHz == true) && pHTInfo->bCurShortGI40MHz)
 390                 tcb_desc->bUseShortGI = true;
 391         else if ((pHTInfo->bCurBW40MHz == false) && pHTInfo->bCurShortGI20MHz)
 392                 tcb_desc->bUseShortGI = true;
 393 }
 394
 395 static void rtllib_query_BandwidthMode(struct rtllib_device *ieee,
 396                                        struct cb_desc *tcb_desc)
 397 {
 398         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 399
 400         tcb_desc->bPacketBW = false;
 401
 402         if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 403                 return;
 404
 405         if (tcb_desc->bMulticast || tcb_desc->bBroadcast)
 406                 return;
 407
 408         if ((tcb_desc->data_rate & 0x80) == 0)
 409                 return;
 410         if (pHTInfo->bCurBW40MHz && pHTInfo->bCurTxBW40MHz &&
 411             !ieee->bandwidth_auto_switch.bforced_tx20Mhz)
 412                 tcb_desc->bPacketBW = true;
 413 }
 414
 415 static void rtllib_query_protectionmode(struct rtllib_device *ieee,
 416                                         struct cb_desc *tcb_desc,
 417                                         struct sk_buff *skb)
 418 {
 419         struct rt_hi_throughput *pHTInfo;
 420
 421         tcb_desc->bRTSSTBC                      = false;
 422         tcb_desc->bRTSUseShortGI                = false;
 423         tcb_desc->bCTSEnable                    = false;
 424         tcb_desc->RTSSC                         = 0;
 425         tcb_desc->bRTSBW                        = false;
 426
 427         if (tcb_desc->bBroadcast || tcb_desc->bMulticast)
 428                 return;
 429
 430         if (is_broadcast_ether_addr(skb->data+16))
 431                 return;
 432
 433         if (ieee->mode < IEEE_N_24G) {
 434                 if (skb->len > ieee->rts) {
 435                         tcb_desc->bRTSEnable = true;
 436                         tcb_desc->rts_rate = MGN_24M;
 437                 } else if (ieee->current_network.buseprotection) {
 438                         tcb_desc->bRTSEnable = true;
 439                         tcb_desc->bCTSEnable = true;
 440                         tcb_desc->rts_rate = MGN_24M;
 441                 }
 442                 return;
 443         }
 444
 445         pHTInfo = ieee->pHTInfo;
 446
 447         while (true) {
 448                 if (pHTInfo->IOTAction & HT_IOT_ACT_FORCED_CTS2SELF) {
 449                         tcb_desc->bCTSEnable    = true;
 450                         tcb_desc->rts_rate  =   MGN_24M;
 451                         tcb_desc->bRTSEnable = true;
 452                         break;
 453                 } else if (pHTInfo->IOTAction & (HT_IOT_ACT_FORCED_RTS |
 454                            HT_IOT_ACT_PURE_N_MODE)) {
 455                         tcb_desc->bRTSEnable = true;
 456                         tcb_desc->rts_rate  =   MGN_24M;
 457                         break;
 458                 }
 459                 if (ieee->current_network.buseprotection) {
 460                         tcb_desc->bRTSEnable = true;
 461                         tcb_desc->bCTSEnable = true;
 462                         tcb_desc->rts_rate = MGN_24M;
 463                         break;
 464                 }
 465                 if (pHTInfo->bCurrentHTSupport  && pHTInfo->bEnableHT) {
 466                         u8 HTOpMode = pHTInfo->CurrentOpMode;
 467
 468                         if ((pHTInfo->bCurBW40MHz && (HTOpMode == 2 ||
 469                              HTOpMode == 3)) ||
 470                              (!pHTInfo->bCurBW40MHz && HTOpMode == 3)) {
 471                                 tcb_desc->rts_rate = MGN_24M;
 472                                 tcb_desc->bRTSEnable = true;
 473                                 break;
 474                         }
 475                 }
 476                 if (skb->len > ieee->rts) {
 477                         tcb_desc->rts_rate = MGN_24M;
 478                         tcb_desc->bRTSEnable = true;
 479                         break;
 480                 }
 481                 if (tcb_desc->bAMPDUEnable) {
 482                         tcb_desc->rts_rate = MGN_24M;
 483                         tcb_desc->bRTSEnable = false;
 484                         break;
 485                 }
 486                 goto NO_PROTECTION;
 487         }
 488         if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
 489                 tcb_desc->bUseShortPreamble = true;
 490         if (ieee->iw_mode == IW_MODE_MASTER)
 491                         goto NO_PROTECTION;
 492         return;
 493 NO_PROTECTION:
 494         tcb_desc->bRTSEnable    = false;
 495         tcb_desc->bCTSEnable    = false;
 496         tcb_desc->rts_rate      = 0;
 497         tcb_desc->RTSSC         = 0;
 498         tcb_desc->bRTSBW        = false;
 499 }
 500
 501
 502 static void rtllib_txrate_selectmode(struct rtllib_device *ieee,
 503                                      struct cb_desc *tcb_desc)
 504 {
 505         if (ieee->bTxDisableRateFallBack)
 506                 tcb_desc->bTxDisableRateFallBack = true;
 507
 508         if (ieee->bTxUseDriverAssingedRate)
 509                 tcb_desc->bTxUseDriverAssingedRate = true;
 510         if (!tcb_desc->bTxDisableRateFallBack ||
 511             !tcb_desc->bTxUseDriverAssingedRate) {
 512                 if (ieee->iw_mode == IW_MODE_INFRA ||
 513                     ieee->iw_mode == IW_MODE_ADHOC)
 514                         tcb_desc->RATRIndex = 0;
 515         }
 516 }
 517
 518 u16 rtllib_query_seqnum(struct rtllib_device *ieee, struct sk_buff *skb,
 519                         u8 *dst)
 520 {
 521         u16 seqnum = 0;
 522
 523         if (is_multicast_ether_addr(dst))
 524                 return 0;
 525         if (IsQoSDataFrame(skb->data)) {
 526                 struct tx_ts_record *pTS = NULL;
 527
 528                 if (!GetTs(ieee, (struct ts_common_info **)(&pTS), dst,
 529                     skb->priority, TX_DIR, true))
 530                         return 0;
 531                 seqnum = pTS->TxCurSeq;
 532                 pTS->TxCurSeq = (pTS->TxCurSeq+1)%4096;
 533                 return seqnum;
 534         }
 535         return 0;
 536 }
 537
 538 static int wme_downgrade_ac(struct sk_buff *skb)
 539 {
 540         switch (skb->priority) {
 541         case 6:
 542         case 7:
 543                 skb->priority = 5; /* VO -> VI */
 544                 return 0;
 545         case 4:
 546         case 5:
 547                 skb->priority = 3; /* VI -> BE */
 548                 return 0;
 549         case 0:
 550         case 3:
 551                 skb->priority = 1; /* BE -> BK */
 552                 return 0;
 553         default:
 554                 return -1;
 555         }
 556 }
 557
 558 static u8 rtllib_current_rate(struct rtllib_device *ieee)
 559 {
 560         if (ieee->mode & IEEE_MODE_MASK)
 561                 return ieee->rate;
 562
 563         if (ieee->HTCurrentOperaRate)
 564                 return ieee->HTCurrentOperaRate;
 565         else
 566                 return ieee->rate & 0x7F;
 567 }
 568
 569 int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
 570 {
 571         struct rtllib_device *ieee = (struct rtllib_device *)
 572                                      netdev_priv_rsl(dev);
 573         struct rtllib_txb *txb = NULL;
 574         struct rtllib_hdr_3addrqos *frag_hdr;
 575         int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
 576         unsigned long flags;
 577         struct net_device_stats *stats = &ieee->stats;
 578         int ether_type = 0, encrypt;
 579         int bytes, fc, qos_ctl = 0, hdr_len;
 580         struct sk_buff *skb_frag;
 581         struct rtllib_hdr_3addrqos header = { /* Ensure zero initialized */
 582                 .duration_id = 0,
 583                 .seq_ctl = 0,
 584                 .qos_ctl = 0
 585         };
 586         int qos_actived = ieee->current_network.qos_data.active;
 587         u8 dest[ETH_ALEN];
 588         u8 src[ETH_ALEN];
 589         struct lib80211_crypt_data *crypt = NULL;
 590         struct cb_desc *tcb_desc;
 591         u8 bIsMulticast = false;
 592         u8 IsAmsdu = false;
 593         bool    bdhcp = false;
 594
 595         spin_lock_irqsave(&ieee->lock, flags);
 596
 597         /* If there is no driver handler to take the TXB, don't bother
 598          * creating it...
 599          */
 600         if ((!ieee->hard_start_xmit && !(ieee->softmac_features &
 601            IEEE_SOFTMAC_TX_QUEUE)) ||
 602            ((!ieee->softmac_data_hard_start_xmit &&
 603            (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) {
 604                 netdev_warn(ieee->dev, "No xmit handler.\n");
 605                 goto success;
 606         }
 607
 608
 609         if (likely(ieee->raw_tx == 0)) {
 610                 if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
 611                         netdev_warn(ieee->dev, "skb too small (%d).\n",
 612                                     skb->len);
 613                         goto success;
 614                 }
 615                 /* Save source and destination addresses */
 616                 ether_addr_copy(dest, skb->data);
 617                 ether_addr_copy(src, skb->data + ETH_ALEN);
 618
 619                 memset(skb->cb, 0, sizeof(skb->cb));
 620                 ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);
 621
 622                 if (ieee->iw_mode == IW_MODE_MONITOR) {
 623                         txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
 624                         if (unlikely(!txb)) {
 625                                 netdev_warn(ieee->dev,
 626                                             "Could not allocate TXB\n");
 627                                 goto failed;
 628                         }
 629
 630                         txb->encrypted = 0;
 631                         txb->payload_size = cpu_to_le16(skb->len);
 632                         memcpy(skb_put(txb->fragments[0], skb->len), skb->data,
 633                                skb->len);
 634
 635                         goto success;
 636                 }
 637
 638                 if (skb->len > 282) {
 639                         if (ETH_P_IP == ether_type) {
 640                                 const struct iphdr *ip = (struct iphdr *)
 641                                         ((u8 *)skb->data+14);
 642                                 if (IPPROTO_UDP == ip->protocol) {
 643                                         struct udphdr *udp;
 644
 645                                         udp = (struct udphdr *)((u8 *)ip +
 646                                               (ip->ihl << 2));
 647                                         if (((((u8 *)udp)[1] == 68) &&
 648                                            (((u8 *)udp)[3] == 67)) ||
 649                                            ((((u8 *)udp)[1] == 67) &&
 650                                            (((u8 *)udp)[3] == 68))) {
 651                                                 bdhcp = true;
 652                                                 ieee->LPSDelayCnt = 200;
 653                                         }
 654                                 }
 655                         } else if (ETH_P_ARP == ether_type) {
 656                                 netdev_info(ieee->dev,
 657                                             "=================>DHCP Protocol start tx ARP pkt!!\n");
 658                                 bdhcp = true;
 659                                 ieee->LPSDelayCnt =
 660                                          ieee->current_network.tim.tim_count;
 661                         }
 662                 }
 663
 664                 skb->priority = rtllib_classify(skb, IsAmsdu);
 665                 crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
 666                 encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
 667                         ieee->host_encrypt && crypt && crypt->ops;
 668                 if (!encrypt && ieee->ieee802_1x &&
 669                     ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
 670                         stats->tx_dropped++;
 671                         goto success;
 672                 }
 673                 if (crypt && !encrypt && ether_type == ETH_P_PAE) {
 674                         struct eapol *eap = (struct eapol *)(skb->data +
 675                                 sizeof(struct ethhdr) - SNAP_SIZE -
 676                                 sizeof(u16));
 677                         netdev_dbg(ieee->dev,
 678                                    "TX: IEEE 802.11 EAPOL frame: %s\n",
 679                                    eap_get_type(eap->type));
 680                 }
 681
 682                 /* Advance the SKB to the start of the payload */
 683                 skb_pull(skb, sizeof(struct ethhdr));
 684
 685                 /* Determine total amount of storage required for TXB packets */
 686                 bytes = skb->len + SNAP_SIZE + sizeof(u16);
 687
 688                 if (encrypt)
 689                         fc = RTLLIB_FTYPE_DATA | RTLLIB_FCTL_WEP;
 690                 else
 691                         fc = RTLLIB_FTYPE_DATA;
 692
 693                 if (qos_actived)
 694                         fc |= RTLLIB_STYPE_QOS_DATA;
 695                 else
 696                         fc |= RTLLIB_STYPE_DATA;
 697
 698                 if (ieee->iw_mode == IW_MODE_INFRA) {
 699                         fc |= RTLLIB_FCTL_TODS;
 700                         /* To DS: Addr1 = BSSID, Addr2 = SA,
 701                          * Addr3 = DA
 702                          */
 703                         ether_addr_copy(header.addr1,
 704                                         ieee->current_network.bssid);
 705                         ether_addr_copy(header.addr2, src);
 706                         if (IsAmsdu)
 707                                 ether_addr_copy(header.addr3,
 708                                                 ieee->current_network.bssid);
 709                         else
 710                                 ether_addr_copy(header.addr3, dest);
 711                 } else if (ieee->iw_mode == IW_MODE_ADHOC) {
 712                         /* not From/To DS: Addr1 = DA, Addr2 = SA,
 713                          * Addr3 = BSSID
 714                          */
 715                         ether_addr_copy(header.addr1, dest);
 716                         ether_addr_copy(header.addr2, src);
 717                         ether_addr_copy(header.addr3,
 718                                         ieee->current_network.bssid);
 719                 }
 720
 721                 bIsMulticast = is_multicast_ether_addr(header.addr1);
 722
 723                 header.frame_ctl = cpu_to_le16(fc);
 724
 725                 /* Determine fragmentation size based on destination (multicast
 726                  * and broadcast are not fragmented)
 727                  */
 728                 if (bIsMulticast) {
 729                         frag_size = MAX_FRAG_THRESHOLD;
 730                         qos_ctl |= QOS_CTL_NOTCONTAIN_ACK;
 731                 } else {
 732                         frag_size = ieee->fts;
 733                         qos_ctl = 0;
 734                 }
 735
 736                 if (qos_actived) {
 737                         hdr_len = RTLLIB_3ADDR_LEN + 2;
 738
 739                 /* in case we are a client verify acm is not set for this ac */
 740                 while (unlikely(ieee->wmm_acm & (0x01 << skb->priority))) {
 741                         netdev_info(ieee->dev, "skb->priority = %x\n",
 742                                     skb->priority);
 743                         if (wme_downgrade_ac(skb))
 744                                 break;
 745                         netdev_info(ieee->dev, "converted skb->priority = %x\n",
 746                                skb->priority);
 747                  }
 748                         qos_ctl |= skb->priority;
 749                         header.qos_ctl = cpu_to_le16(qos_ctl & RTLLIB_QOS_TID);
 750                 } else {
 751                         hdr_len = RTLLIB_3ADDR_LEN;
 752                 }
 753                 /* Determine amount of payload per fragment.  Regardless of if
 754                  * this stack is providing the full 802.11 header, one will
 755                  * eventually be affixed to this fragment -- so we must account
 756                  * for it when determining the amount of payload space.
 757                  */
 758                 bytes_per_frag = frag_size - hdr_len;
 759                 if (ieee->config &
 760                    (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 761                         bytes_per_frag -= RTLLIB_FCS_LEN;
 762
 763                 /* Each fragment may need to have room for encrypting
 764                  * pre/postfix
 765                  */
 766                 if (encrypt) {
 767                         bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
 768                                 crypt->ops->extra_mpdu_postfix_len +
 769                                 crypt->ops->extra_msdu_prefix_len +
 770                                 crypt->ops->extra_msdu_postfix_len;
 771                 }
 772                 /* Number of fragments is the total bytes_per_frag /
 773                  * payload_per_fragment
 774                  */
 775                 nr_frags = bytes / bytes_per_frag;
 776                 bytes_last_frag = bytes % bytes_per_frag;
 777                 if (bytes_last_frag)
 778                         nr_frags++;
 779                 else
 780                         bytes_last_frag = bytes_per_frag;
 781
 782                 /* When we allocate the TXB we allocate enough space for the
 783                  * reserve and full fragment bytes (bytes_per_frag doesn't
 784                  * include prefix, postfix, header, FCS, etc.)
 785                  */
 786                 txb = rtllib_alloc_txb(nr_frags, frag_size +
 787                                        ieee->tx_headroom, GFP_ATOMIC);
 788                 if (unlikely(!txb)) {
 789                         netdev_warn(ieee->dev, "Could not allocate TXB\n");
 790                         goto failed;
 791                 }
 792                 txb->encrypted = encrypt;
 793                 txb->payload_size = cpu_to_le16(bytes);
 794
 795                 if (qos_actived)
 796                         txb->queue_index = UP2AC(skb->priority);
 797                 else
 798                         txb->queue_index = WME_AC_BE;
 799
 800                 for (i = 0; i < nr_frags; i++) {
 801                         skb_frag = txb->fragments[i];
 802                         tcb_desc = (struct cb_desc *)(skb_frag->cb +
 803                                     MAX_DEV_ADDR_SIZE);
 804                         if (qos_actived) {
 805                                 skb_frag->priority = skb->priority;
 806                                 tcb_desc->queue_index =  UP2AC(skb->priority);
 807                         } else {
 808                                 skb_frag->priority = WME_AC_BE;
 809                                 tcb_desc->queue_index = WME_AC_BE;
 810                         }
 811                         skb_reserve(skb_frag, ieee->tx_headroom);
 812
 813                         if (encrypt) {
 814                                 if (ieee->hwsec_active)
 815                                         tcb_desc->bHwSec = 1;
 816                                 else
 817                                         tcb_desc->bHwSec = 0;
 818                                 skb_reserve(skb_frag,
 819                                             crypt->ops->extra_mpdu_prefix_len +
 820                                             crypt->ops->extra_msdu_prefix_len);
 821                         } else {
 822                                 tcb_desc->bHwSec = 0;
 823                         }
 824                         frag_hdr = (struct rtllib_hdr_3addrqos *)
 825                                    skb_put(skb_frag, hdr_len);
 826                         memcpy(frag_hdr, &header, hdr_len);
 827
 828                         /* If this is not the last fragment, then add the
 829                          * MOREFRAGS bit to the frame control
 830                          */
 831                         if (i != nr_frags - 1) {
 832                                 frag_hdr->frame_ctl = cpu_to_le16(
 833                                         fc | RTLLIB_FCTL_MOREFRAGS);
 834                                 bytes = bytes_per_frag;
 835
 836                         } else {
 837                                 /* The last fragment has the remaining length */
 838                                 bytes = bytes_last_frag;
 839                         }
 840                         if ((qos_actived) && (!bIsMulticast)) {
 841                                 frag_hdr->seq_ctl =
 842                                          cpu_to_le16(rtllib_query_seqnum(ieee, skb_frag,
 843                                                              header.addr1));
 844                                 frag_hdr->seq_ctl =
 845                                          cpu_to_le16(le16_to_cpu(frag_hdr->seq_ctl)<<4 | i);
 846                         } else {
 847                                 frag_hdr->seq_ctl =
 848                                          cpu_to_le16(ieee->seq_ctrl[0]<<4 | i);
 849                         }
 850                         /* Put a SNAP header on the first fragment */
 851                         if (i == 0) {
 852                                 rtllib_put_snap(
 853                                         skb_put(skb_frag, SNAP_SIZE +
 854                                         sizeof(u16)), ether_type);
 855                                 bytes -= SNAP_SIZE + sizeof(u16);
 856                         }
 857
 858                         memcpy(skb_put(skb_frag, bytes), skb->data, bytes);
 859
 860                         /* Advance the SKB... */
 861                         skb_pull(skb, bytes);
 862
 863                         /* Encryption routine will move the header forward in
 864                          * order to insert the IV between the header and the
 865                          * payload
 866                          */
 867                         if (encrypt)
 868                                 rtllib_encrypt_fragment(ieee, skb_frag,
 869                                                         hdr_len);
 870                         if (ieee->config &
 871                            (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 872                                 skb_put(skb_frag, 4);
 873                 }
 874
 875                 if ((qos_actived) && (!bIsMulticast)) {
 876                         if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF)
 877                                 ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0;
 878                         else
 879                                 ieee->seq_ctrl[UP2AC(skb->priority) + 1]++;
 880                 } else {
 881                         if (ieee->seq_ctrl[0] == 0xFFF)
 882                                 ieee->seq_ctrl[0] = 0;
 883                         else
 884                                         ieee->seq_ctrl[0]++;
 885                 }
 886         } else {
 887                 if (unlikely(skb->len < sizeof(struct rtllib_hdr_3addr))) {
 888                         netdev_warn(ieee->dev, "skb too small (%d).\n",
 889                                     skb->len);
 890                         goto success;
 891                 }
 892
 893                 txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
 894                 if (!txb) {
 895                         netdev_warn(ieee->dev, "Could not allocate TXB\n");
 896                         goto failed;
 897                 }
 898
 899                 txb->encrypted = 0;
 900                 txb->payload_size = cpu_to_le16(skb->len);
 901                 memcpy(skb_put(txb->fragments[0], skb->len), skb->data,
 902                        skb->len);
 903         }
 904
 905  success:
 906         if (txb) {
 907                 struct cb_desc *tcb_desc = (struct cb_desc *)
 908                                 (txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE);
 909                 tcb_desc->bTxEnableFwCalcDur = 1;
 910                 tcb_desc->priority = skb->priority;
 911
 912                 if (ether_type == ETH_P_PAE) {
 913                         if (ieee->pHTInfo->IOTAction &
 914                             HT_IOT_ACT_WA_IOT_Broadcom) {
 915                                 tcb_desc->data_rate =
 916                                          MgntQuery_TxRateExcludeCCKRates(ieee);
 917                                 tcb_desc->bTxDisableRateFallBack = false;
 918                         } else {
 919                                 tcb_desc->data_rate = ieee->basic_rate;
 920                                 tcb_desc->bTxDisableRateFallBack = 1;
 921                         }
 922
 923
 924                         tcb_desc->RATRIndex = 7;
 925                         tcb_desc->bTxUseDriverAssingedRate = 1;
 926                 } else {
 927                         if (is_multicast_ether_addr(header.addr1))
 928                                 tcb_desc->bMulticast = 1;
 929                         if (is_broadcast_ether_addr(header.addr1))
 930                                 tcb_desc->bBroadcast = 1;
 931                         rtllib_txrate_selectmode(ieee, tcb_desc);
 932                         if (tcb_desc->bMulticast ||  tcb_desc->bBroadcast)
 933                                 tcb_desc->data_rate = ieee->basic_rate;
 934                         else
 935                                 tcb_desc->data_rate = rtllib_current_rate(ieee);
 936
 937                         if (bdhcp) {
 938                                 if (ieee->pHTInfo->IOTAction &
 939                                     HT_IOT_ACT_WA_IOT_Broadcom) {
 940                                         tcb_desc->data_rate =
 941                                            MgntQuery_TxRateExcludeCCKRates(ieee);
 942                                         tcb_desc->bTxDisableRateFallBack = false;
 943                                 } else {
 944                                         tcb_desc->data_rate = MGN_1M;
 945                                         tcb_desc->bTxDisableRateFallBack = 1;
 946                                 }
 947
 948
 949                                 tcb_desc->RATRIndex = 7;
 950                                 tcb_desc->bTxUseDriverAssingedRate = 1;
 951                                 tcb_desc->bdhcp = 1;
 952                         }
 953
 954                         rtllib_qurey_ShortPreambleMode(ieee, tcb_desc);
 955                         rtllib_tx_query_agg_cap(ieee, txb->fragments[0],
 956                                                 tcb_desc);
 957                         rtllib_query_HTCapShortGI(ieee, tcb_desc);
 958                         rtllib_query_BandwidthMode(ieee, tcb_desc);
 959                         rtllib_query_protectionmode(ieee, tcb_desc,
 960                                                     txb->fragments[0]);
 961                 }
 962         }
 963         spin_unlock_irqrestore(&ieee->lock, flags);
 964         dev_kfree_skb_any(skb);
 965         if (txb) {
 966                 if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) {
 967                         dev->stats.tx_packets++;
 968                         dev->stats.tx_bytes += le16_to_cpu(txb->payload_size);
 969                         rtllib_softmac_xmit(txb, ieee);
 970                 } else {
 971                         if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
 972                                 stats->tx_packets++;
 973                                 stats->tx_bytes += le16_to_cpu(txb->payload_size);
 974                                 return 0;
 975                         }
 976                         rtllib_txb_free(txb);
 977                 }
 978         }
 979
 980         return 0;
 981
 982  failed:
 983         spin_unlock_irqrestore(&ieee->lock, flags);
 984         netif_stop_queue(dev);
 985         stats->tx_errors++;
 986         return 1;
 987
 988 }
 989 int rtllib_xmit(struct sk_buff *skb, struct net_device *dev)
 990 {
 991         memset(skb->cb, 0, sizeof(skb->cb));
 992         return rtllib_xmit_inter(skb, dev);
 993 }
 994 EXPORT_SYMBOL(rtllib_xmit);