linux/drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/******************************************************************************
   3 *
   4 *  Copyright(c) 2003 - 2004 Intel Corporation. All rights reserved.
   5 *
   6 *  Contact Information:
   7 *  James P. Ketrenos <ipw2100-admin@linux.intel.com>
   8 *  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   9 *
  10 *
  11 *  Few modifications for Realtek's Wi-Fi drivers by
  12 *  Andrea Merello <andrea.merello@gmail.com>
  13 *
  14 *  A special thanks goes to Realtek for their support !
  15 *
  16 ******************************************************************************/
  17
  18#include <linux/compiler.h>
  19#include <linux/errno.h>
  20#include <linux/if_arp.h>
  21#include <linux/in6.h>
  22#include <linux/in.h>
  23#include <linux/ip.h>
  24#include <linux/kernel.h>
  25#include <linux/module.h>
  26#include <linux/netdevice.h>
  27#include <linux/pci.h>
  28#include <linux/proc_fs.h>
  29#include <linux/skbuff.h>
  30#include <linux/slab.h>
  31#include <linux/tcp.h>
  32#include <linux/types.h>
  33#include <linux/wireless.h>
  34#include <linux/etherdevice.h>
  35#include <linux/uaccess.h>
  36#include <linux/if_vlan.h>
  37
  38#include "ieee80211.h"
  39
  40
  41/*
  42 *
  43 *
  44 * 802.11 Data Frame
  45 *
  46 *
  47 * 802.11 frame_contorl for data frames - 2 bytes
  48 *      ,-----------------------------------------------------------------------------------------.
  49 * bits | 0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |  a  |  b  |  c  |  d  |  e   |
  50 *      |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|------|
  51 * val  | 0  |  0  |  0  |  1  |  x  |  0  |  0  |  0  |  1  |  0  |  x  |  x  |  x  |  x  |  x   |
  52 *      |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|------|
  53 * desc | ^-ver-^  |  ^type-^  |  ^-----subtype-----^  | to  |from |more |retry| pwr |more |wep   |
  54 *      |          |           | x=0 data,x=1 data+ack | DS  | DS  |frag |     | mgm |data |      |
  55 *      '-----------------------------------------------------------------------------------------'
  56 *                                                    /\
  57 *                                                    |
  58 * 802.11 Data Frame                                  |
  59 *           ,--------- 'ctrl' expands to >-----------'
  60 *           |
  61 *        ,--'---,-------------------------------------------------------------.
  62 *  Bytes |  2   |  2   |    6    |    6    |    6    |  2   | 0..2312 |   4  |
  63 *        |------|------|---------|---------|---------|------|---------|------|
  64 *  Desc. | ctrl | dura |  DA/RA  |   TA    |    SA   | Sequ |  Frame  |  fcs |
  65 *        |      | tion | (BSSID) |         |         | ence |  data   |      |
  66 *        `--------------------------------------------------|         |------'
  67 *  Total: 28 non-data bytes                                 `----.----'
  68 *                                                                |
  69 *         .- 'Frame data' expands to <---------------------------'
  70 *         |
  71 *         V
  72 *        ,---------------------------------------------------.
  73 *  Bytes |  1   |  1   |    1    |    3     |  2   |  0-2304 |
  74 *        |------|------|---------|----------|------|---------|
  75 *  Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP      |
  76 *        | DSAP | SSAP |         |          |      | Packet  |
  77 *        | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8|      |         |
  78 *        `-----------------------------------------|         |
  79 *  Total: 8 non-data bytes                         `----.----'
  80 *                                                       |
  81 *         .- 'IP Packet' expands, if WEP enabled, to <--'
  82 *         |
  83 *         V
  84 *        ,-----------------------.
  85 *  Bytes |  4  |   0-2296  |  4  |
  86 *        |-----|-----------|-----|
  87 *  Desc. | IV  | Encrypted | ICV |
  88 *        |     | IP Packet |     |
  89 *        `-----------------------'
  90 *  Total: 8 non-data bytes
  91 *
  92 *
  93 *  802.3 Ethernet Data Frame
  94 *
  95 *        ,-----------------------------------------.
  96 *  Bytes |   6   |   6   |  2   |  Variable |   4  |
  97 *        |-------|-------|------|-----------|------|
  98 *  Desc. | Dest. | Source| Type | IP Packet |  fcs |
  99 *        |  MAC  |  MAC  |      |           |      |
 100 *        `-----------------------------------------'
 101 *  Total: 18 non-data bytes
 102 *
 103 *  In the event that fragmentation is required, the incoming payload is split into
 104 *  N parts of size ieee->fts.  The first fragment contains the SNAP header and the
 105 *  remaining packets are just data.
 106 *
 107 *  If encryption is enabled, each fragment payload size is reduced by enough space
 108 *  to add the prefix and postfix (IV and ICV totalling 8 bytes in the case of WEP)
 109 *  So if you have 1500 bytes of payload with ieee->fts set to 500 without
 110 *  encryption it will take 3 frames.  With WEP it will take 4 frames as the
 111 *  payload of each frame is reduced to 492 bytes.
 112 *
 113 * SKB visualization
 114 *
 115 *  ,- skb->data
 116 * |
 117 * |    ETHERNET HEADER        ,-<-- PAYLOAD
 118 * |                           |     14 bytes from skb->data
 119 * |  2 bytes for Type --> ,T. |     (sizeof ethhdr)
 120 * |                       | | |
 121 * |,-Dest.--. ,--Src.---. | | |
 122 * |  6 bytes| | 6 bytes | | | |
 123 * v         | |         | | | |
 124 * 0         | v       1 | v | v           2
 125 * 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
 126 *     ^     | ^         | ^ |
 127 *     |     | |         | | |
 128 *     |     | |         | `T' <---- 2 bytes for Type
 129 *     |     | |         |
 130 *     |     | '---SNAP--' <-------- 6 bytes for SNAP
 131 *     |     |
 132 *     `-IV--' <-------------------- 4 bytes for IV (WEP)
 133 *
 134 *      SNAP HEADER
 135 *
 136 */
 137
 138static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
 139static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };
 140
 141static inline int ieee80211_put_snap(u8 *data, u16 h_proto)
 142{
 143        struct ieee80211_snap_hdr *snap;
 144        u8 *oui;
 145
 146        snap = (struct ieee80211_snap_hdr *)data;
 147        snap->dsap = 0xaa;
 148        snap->ssap = 0xaa;
 149        snap->ctrl = 0x03;
 150
 151        if (h_proto == 0x8137 || h_proto == 0x80f3)
 152                oui = P802_1H_OUI;
 153        else
 154                oui = RFC1042_OUI;
 155        snap->oui[0] = oui[0];
 156        snap->oui[1] = oui[1];
 157        snap->oui[2] = oui[2];
 158
 159        *(__be16 *)(data + SNAP_SIZE) = htons(h_proto);
 160
 161        return SNAP_SIZE + sizeof(u16);
 162}
 163
 164int ieee80211_encrypt_fragment(
 165        struct ieee80211_device *ieee,
 166        struct sk_buff *frag,
 167        int hdr_len)
 168{
 169        struct ieee80211_crypt_data *crypt = ieee->crypt[ieee->tx_keyidx];
 170        int res;
 171
 172        if (!(crypt && crypt->ops)) {
 173                printk("=========>%s(), crypt is null\n", __func__);
 174                return -1;
 175        }
 176
 177        if (ieee->tkip_countermeasures &&
 178            crypt && crypt->ops && strcmp(crypt->ops->name, "TKIP") == 0) {
 179                if (net_ratelimit()) {
 180                        struct rtl_80211_hdr_3addrqos *header;
 181
 182                        header = (struct rtl_80211_hdr_3addrqos *)frag->data;
 183                        netdev_dbg(ieee->dev, "TKIP countermeasures: dropped "
 184                               "TX packet to %pM\n", header->addr1);
 185                }
 186                return -1;
 187        }
 188
 189        /* To encrypt, frame format is:
 190         * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes)
 191         */
 192
 193        // PR: FIXME: Copied from hostap. Check fragmentation/MSDU/MPDU encryption.
 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, "Encryption failed: len=%d.\n",
 207                            frag->len);
 208                ieee->ieee_stats.tx_discards++;
 209                return -1;
 210        }
 211
 212        return 0;
 213}
 214
 215
 216void ieee80211_txb_free(struct ieee80211_txb *txb)
 217{
 218        //int i;
 219        if (unlikely(!txb))
 220                return;
 221        kfree(txb);
 222}
 223EXPORT_SYMBOL(ieee80211_txb_free);
 224
 225static struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size,
 226                                                 gfp_t gfp_mask)
 227{
 228        struct ieee80211_txb *txb;
 229        int i;
 230        txb = kmalloc(
 231                sizeof(struct ieee80211_txb) + (sizeof(u8 *) * nr_frags),
 232                gfp_mask);
 233        if (!txb)
 234                return NULL;
 235
 236        memset(txb, 0, sizeof(struct ieee80211_txb));
 237        txb->nr_frags = nr_frags;
 238        txb->frag_size = __cpu_to_le16(txb_size);
 239
 240        for (i = 0; i < nr_frags; i++) {
 241                txb->fragments[i] = dev_alloc_skb(txb_size);
 242                if (unlikely(!txb->fragments[i])) {
 243                        i--;
 244                        break;
 245                }
 246                memset(txb->fragments[i]->cb, 0, sizeof(txb->fragments[i]->cb));
 247        }
 248        if (unlikely(i != nr_frags)) {
 249                while (i >= 0)
 250                        dev_kfree_skb_any(txb->fragments[i--]);
 251                kfree(txb);
 252                return NULL;
 253        }
 254        return txb;
 255}
 256
 257// Classify the to-be send data packet
 258// Need to acquire the sent queue index.
 259static int
 260ieee80211_classify(struct sk_buff *skb, struct ieee80211_network *network)
 261{
 262        struct ethhdr *eth;
 263        struct iphdr *ip;
 264        eth = (struct ethhdr *)skb->data;
 265        if (eth->h_proto != htons(ETH_P_IP))
 266                return 0;
 267
 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
 289static void ieee80211_tx_query_agg_cap(struct ieee80211_device *ieee,
 290                                       struct sk_buff *skb, struct cb_desc *tcb_desc)
 291{
 292        PRT_HIGH_THROUGHPUT     pHTInfo = ieee->pHTInfo;
 293        struct tx_ts_record        *pTxTs = NULL;
 294        struct rtl_80211_hdr_1addr *hdr = (struct rtl_80211_hdr_1addr *)skb->data;
 295
 296        if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 297                return;
 298        if (!IsQoSDataFrame(skb->data))
 299                return;
 300
 301        if (is_multicast_ether_addr(hdr->addr1))
 302                return;
 303        //check packet and mode later
 304        if (!ieee->GetNmodeSupportBySecCfg(ieee->dev)) {
 305                return;
 306        }
 307        if (pHTInfo->bCurrentAMPDUEnable) {
 308                if (!GetTs(ieee, (struct ts_common_info **)(&pTxTs), hdr->addr1, skb->priority, TX_DIR, true)) {
 309                        printk("===>can't get TS\n");
 310                        return;
 311                }
 312                if (!pTxTs->tx_admitted_ba_record.valid) {
 313                        TsStartAddBaProcess(ieee, pTxTs);
 314                        goto FORCED_AGG_SETTING;
 315                } else if (!pTxTs->using_ba) {
 316                        if (SN_LESS(pTxTs->tx_admitted_ba_record.start_seq_ctrl.field.seq_num, (pTxTs->tx_cur_seq + 1) % 4096))
 317                                pTxTs->using_ba = true;
 318                        else
 319                                goto FORCED_AGG_SETTING;
 320                }
 321
 322                if (ieee->iw_mode == IW_MODE_INFRA) {
 323                        tcb_desc->bAMPDUEnable = true;
 324                        tcb_desc->ampdu_factor = pHTInfo->CurrentAMPDUFactor;
 325                        tcb_desc->ampdu_density = pHTInfo->CurrentMPDUDensity;
 326                }
 327        }
 328FORCED_AGG_SETTING:
 329        switch (pHTInfo->ForcedAMPDUMode) {
 330                case HT_AGG_AUTO:
 331                        break;
 332
 333                case HT_AGG_FORCE_ENABLE:
 334                        tcb_desc->bAMPDUEnable = true;
 335                        tcb_desc->ampdu_density = pHTInfo->ForcedMPDUDensity;
 336                        tcb_desc->ampdu_factor = pHTInfo->ForcedAMPDUFactor;
 337                        break;
 338
 339                case HT_AGG_FORCE_DISABLE:
 340                        tcb_desc->bAMPDUEnable = false;
 341                        tcb_desc->ampdu_density = 0;
 342                        tcb_desc->ampdu_factor = 0;
 343                        break;
 344
 345        }
 346                return;
 347}
 348
 349static void ieee80211_qurey_ShortPreambleMode(struct ieee80211_device *ieee,
 350                                              struct cb_desc *tcb_desc)
 351{
 352        tcb_desc->bUseShortPreamble = false;
 353        if (tcb_desc->data_rate == 2) {//// 1M can only use Long Preamble. 11B spec
 354                return;
 355        } else if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE) {
 356                tcb_desc->bUseShortPreamble = true;
 357        }
 358        return;
 359}
 360static void
 361ieee80211_query_HTCapShortGI(struct ieee80211_device *ieee, struct cb_desc *tcb_desc)
 362{
 363        PRT_HIGH_THROUGHPUT             pHTInfo = ieee->pHTInfo;
 364
 365        tcb_desc->bUseShortGI           = false;
 366
 367        if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 368                return;
 369
 370        if (pHTInfo->bForcedShortGI) {
 371                tcb_desc->bUseShortGI = true;
 372                return;
 373        }
 374
 375        if ((pHTInfo->bCurBW40MHz == true) && pHTInfo->bCurShortGI40MHz)
 376                tcb_desc->bUseShortGI = true;
 377        else if ((pHTInfo->bCurBW40MHz == false) && pHTInfo->bCurShortGI20MHz)
 378                tcb_desc->bUseShortGI = true;
 379}
 380
 381static void ieee80211_query_BandwidthMode(struct ieee80211_device *ieee,
 382                                          struct cb_desc *tcb_desc)
 383{
 384        PRT_HIGH_THROUGHPUT     pHTInfo = ieee->pHTInfo;
 385
 386        tcb_desc->bPacketBW = false;
 387
 388        if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 389                return;
 390
 391        if (tcb_desc->bMulticast || tcb_desc->bBroadcast)
 392                return;
 393
 394        if ((tcb_desc->data_rate & 0x80) == 0) // If using legacy rate, it shall use 20MHz channel.
 395                return;
 396        //BandWidthAutoSwitch is for auto switch to 20 or 40 in long distance
 397        if (pHTInfo->bCurBW40MHz && pHTInfo->bCurTxBW40MHz && !ieee->bandwidth_auto_switch.bforced_tx20Mhz)
 398                tcb_desc->bPacketBW = true;
 399        return;
 400}
 401
 402static void ieee80211_query_protectionmode(struct ieee80211_device *ieee,
 403                                           struct cb_desc *tcb_desc,
 404                                           struct sk_buff *skb)
 405{
 406        // Common Settings
 407        tcb_desc->bRTSSTBC                      = false;
 408        tcb_desc->bRTSUseShortGI                = false; // Since protection frames are always sent by legacy rate, ShortGI will never be used.
 409        tcb_desc->bCTSEnable                    = false; // Most of protection using RTS/CTS
 410        tcb_desc->RTSSC                         = 0;            // 20MHz: Don't care;  40MHz: Duplicate.
 411        tcb_desc->bRTSBW                        = false; // RTS frame bandwidth is always 20MHz
 412
 413        if (tcb_desc->bBroadcast || tcb_desc->bMulticast) //only unicast frame will use rts/cts
 414                return;
 415
 416        if (is_broadcast_ether_addr(skb->data + 16))  //check addr3 as infrastructure add3 is DA.
 417                return;
 418
 419        if (ieee->mode < IEEE_N_24G) /* b, g mode */ {
 420                        // (1) RTS_Threshold is compared to the MPDU, not MSDU.
 421                        // (2) If there are more than one frag in  this MSDU, only the first frag uses protection frame.
 422                        //              Other fragments are protected by previous fragment.
 423                        //              So we only need to check the length of first fragment.
 424                if (skb->len > ieee->rts) {
 425                        tcb_desc->bRTSEnable = true;
 426                        tcb_desc->rts_rate = MGN_24M;
 427                } else if (ieee->current_network.buseprotection) {
 428                        // Use CTS-to-SELF in protection mode.
 429                        tcb_desc->bRTSEnable = true;
 430                        tcb_desc->bCTSEnable = true;
 431                        tcb_desc->rts_rate = MGN_24M;
 432                }
 433                //otherwise return;
 434                return;
 435        } else { // 11n High throughput case.
 436                PRT_HIGH_THROUGHPUT pHTInfo = ieee->pHTInfo;
 437                while (true) {
 438                        //check ERP protection
 439                        if (ieee->current_network.buseprotection) {// CTS-to-SELF
 440                                tcb_desc->bRTSEnable = true;
 441                                tcb_desc->bCTSEnable = true;
 442                                tcb_desc->rts_rate = MGN_24M;
 443                                break;
 444                        }
 445                        //check HT op mode
 446                        if (pHTInfo->bCurrentHTSupport && pHTInfo->bEnableHT) {
 447                                u8 HTOpMode = pHTInfo->CurrentOpMode;
 448                                if ((pHTInfo->bCurBW40MHz && (HTOpMode == 2 || HTOpMode == 3)) ||
 449                                                        (!pHTInfo->bCurBW40MHz && HTOpMode == 3)) {
 450                                        tcb_desc->rts_rate = MGN_24M; // Rate is 24Mbps.
 451                                        tcb_desc->bRTSEnable = true;
 452                                        break;
 453                                }
 454                        }
 455                        //check rts
 456                        if (skb->len > ieee->rts) {
 457                                tcb_desc->rts_rate = MGN_24M; // Rate is 24Mbps.
 458                                tcb_desc->bRTSEnable = true;
 459                                break;
 460                        }
 461                        //to do list: check MIMO power save condition.
 462                        //check AMPDU aggregation for TXOP
 463                        if (tcb_desc->bAMPDUEnable) {
 464                                tcb_desc->rts_rate = MGN_24M; // Rate is 24Mbps.
 465                                // According to 8190 design, firmware sends CF-End only if RTS/CTS is enabled. However, it degrads
 466                                // throughput around 10M, so we disable of this mechanism. 2007.08.03 by Emily
 467                                tcb_desc->bRTSEnable = false;
 468                                break;
 469                        }
 470                        //check IOT action
 471                        if (pHTInfo->IOTAction & HT_IOT_ACT_FORCED_CTS2SELF) {
 472                                tcb_desc->bCTSEnable    = true;
 473                                tcb_desc->rts_rate  =   MGN_24M;
 474                                tcb_desc->bRTSEnable = true;
 475                                break;
 476                        }
 477                        // Totally no protection case!!
 478                        goto NO_PROTECTION;
 479                }
 480                }
 481        // For test , CTS replace with RTS
 482        if (0) {
 483                tcb_desc->bCTSEnable    = true;
 484                tcb_desc->rts_rate = MGN_24M;
 485                tcb_desc->bRTSEnable    = true;
 486        }
 487        if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
 488                tcb_desc->bUseShortPreamble = true;
 489        if (ieee->mode == IW_MODE_MASTER)
 490                goto NO_PROTECTION;
 491        return;
 492NO_PROTECTION:
 493        tcb_desc->bRTSEnable    = false;
 494        tcb_desc->bCTSEnable    = false;
 495        tcb_desc->rts_rate              = 0;
 496        tcb_desc->RTSSC         = 0;
 497        tcb_desc->bRTSBW                = false;
 498}
 499
 500
 501static void ieee80211_txrate_selectmode(struct ieee80211_device *ieee,
 502                                        struct cb_desc *tcb_desc)
 503{
 504        if (ieee->bTxDisableRateFallBack)
 505                tcb_desc->bTxDisableRateFallBack = true;
 506
 507        if (ieee->bTxUseDriverAssingedRate)
 508                tcb_desc->bTxUseDriverAssingedRate = true;
 509        if (!tcb_desc->bTxDisableRateFallBack || !tcb_desc->bTxUseDriverAssingedRate) {
 510                if (ieee->iw_mode == IW_MODE_INFRA || ieee->iw_mode == IW_MODE_ADHOC)
 511                        tcb_desc->RATRIndex = 0;
 512        }
 513}
 514
 515static void ieee80211_query_seqnum(struct ieee80211_device *ieee,
 516                                   struct sk_buff *skb, u8 *dst)
 517{
 518        if (is_multicast_ether_addr(dst))
 519                return;
 520        if (IsQoSDataFrame(skb->data)) /* we deal qos data only */ {
 521                struct tx_ts_record *pTS = NULL;
 522                if (!GetTs(ieee, (struct ts_common_info **)(&pTS), dst, skb->priority, TX_DIR, true)) {
 523                        return;
 524                }
 525                pTS->tx_cur_seq = (pTS->tx_cur_seq + 1) % 4096;
 526        }
 527}
 528
 529int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 530{
 531        struct ieee80211_device *ieee = netdev_priv(dev);
 532        struct ieee80211_txb *txb = NULL;
 533        struct rtl_80211_hdr_3addrqos *frag_hdr;
 534        int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
 535        unsigned long flags;
 536        struct net_device_stats *stats = &ieee->stats;
 537        int ether_type = 0, encrypt;
 538        int bytes, fc, qos_ctl = 0, hdr_len;
 539        struct sk_buff *skb_frag;
 540        struct rtl_80211_hdr_3addrqos header = { /* Ensure zero initialized */
 541                .duration_id = 0,
 542                .seq_ctl = 0,
 543                .qos_ctl = 0
 544        };
 545        u8 dest[ETH_ALEN], src[ETH_ALEN];
 546        int qos_actived = ieee->current_network.qos_data.active;
 547
 548        struct ieee80211_crypt_data *crypt;
 549
 550        struct cb_desc *tcb_desc;
 551
 552        spin_lock_irqsave(&ieee->lock, flags);
 553
 554        /* If there is no driver handler to take the TXB, dont' bother
 555         * creating it...
 556         */
 557        if ((!ieee->hard_start_xmit && !(ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)) ||
 558           ((!ieee->softmac_data_hard_start_xmit && (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) {
 559                netdev_warn(ieee->dev, "No xmit handler.\n");
 560                goto success;
 561        }
 562
 563
 564        if (likely(ieee->raw_tx == 0)) {
 565                if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
 566                        netdev_warn(ieee->dev, "skb too small (%d).\n",
 567                                    skb->len);
 568                        goto success;
 569                }
 570
 571                memset(skb->cb, 0, sizeof(skb->cb));
 572                ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);
 573
 574                crypt = ieee->crypt[ieee->tx_keyidx];
 575
 576                encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
 577                        ieee->host_encrypt && crypt && crypt->ops;
 578
 579                if (!encrypt && ieee->ieee802_1x &&
 580                ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
 581                        stats->tx_dropped++;
 582                        goto success;
 583                }
 584        #ifdef CONFIG_IEEE80211_DEBUG
 585                if (crypt && !encrypt && ether_type == ETH_P_PAE) {
 586                        struct eapol *eap = (struct eapol *)(skb->data +
 587                                sizeof(struct ethhdr) - SNAP_SIZE - sizeof(u16));
 588                        IEEE80211_DEBUG_EAP("TX: IEEE 802.11 EAPOL frame: %s\n",
 589                                eap_get_type(eap->type));
 590                }
 591        #endif
 592
 593                /* Save source and destination addresses */
 594                memcpy(&dest, skb->data, ETH_ALEN);
 595                memcpy(&src, skb->data + ETH_ALEN, ETH_ALEN);
 596
 597                /* Advance the SKB to the start of the payload */
 598                skb_pull(skb, sizeof(struct ethhdr));
 599
 600                /* Determine total amount of storage required for TXB packets */
 601                bytes = skb->len + SNAP_SIZE + sizeof(u16);
 602
 603                if (encrypt)
 604                        fc = IEEE80211_FTYPE_DATA | IEEE80211_FCTL_WEP;
 605                else
 606
 607                        fc = IEEE80211_FTYPE_DATA;
 608
 609                //if(ieee->current_network.QoS_Enable)
 610                if (qos_actived)
 611                        fc |= IEEE80211_STYPE_QOS_DATA;
 612                else
 613                        fc |= IEEE80211_STYPE_DATA;
 614
 615                if (ieee->iw_mode == IW_MODE_INFRA) {
 616                        fc |= IEEE80211_FCTL_TODS;
 617                        /* To DS: Addr1 = BSSID, Addr2 = SA,
 618                         * Addr3 = DA
 619                         */
 620                        memcpy(&header.addr1, ieee->current_network.bssid, ETH_ALEN);
 621                        memcpy(&header.addr2, &src, ETH_ALEN);
 622                        memcpy(&header.addr3, &dest, ETH_ALEN);
 623                } else if (ieee->iw_mode == IW_MODE_ADHOC) {
 624                        /* not From/To DS: Addr1 = DA, Addr2 = SA,
 625                         * Addr3 = BSSID
 626                         */
 627                        memcpy(&header.addr1, dest, ETH_ALEN);
 628                        memcpy(&header.addr2, src, ETH_ALEN);
 629                        memcpy(&header.addr3, ieee->current_network.bssid, ETH_ALEN);
 630                }
 631
 632                header.frame_ctl = cpu_to_le16(fc);
 633
 634                /* Determine fragmentation size based on destination (multicast
 635                 * and broadcast are not fragmented)
 636                 */
 637                if (is_multicast_ether_addr(header.addr1)) {
 638                        frag_size = MAX_FRAG_THRESHOLD;
 639                        qos_ctl |= QOS_CTL_NOTCONTAIN_ACK;
 640                } else {
 641                        frag_size = ieee->fts;//default:392
 642                        qos_ctl = 0;
 643                }
 644
 645                //if (ieee->current_network.QoS_Enable)
 646                if (qos_actived) {
 647                        hdr_len = IEEE80211_3ADDR_LEN + 2;
 648
 649                        skb->priority = ieee80211_classify(skb, &ieee->current_network);
 650                        qos_ctl |= skb->priority; //set in the ieee80211_classify
 651                        header.qos_ctl = cpu_to_le16(qos_ctl & IEEE80211_QOS_TID);
 652                } else {
 653                        hdr_len = IEEE80211_3ADDR_LEN;
 654                }
 655                /* Determine amount of payload per fragment.  Regardless of if
 656                 * this stack is providing the full 802.11 header, one will
 657                 * eventually be affixed to this fragment -- so we must account for
 658                 * it when determining the amount of payload space.
 659                 */
 660                bytes_per_frag = frag_size - hdr_len;
 661                if (ieee->config &
 662                (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
 663                        bytes_per_frag -= IEEE80211_FCS_LEN;
 664
 665                /* Each fragment may need to have room for encryption pre/postfix */
 666                if (encrypt)
 667                        bytes_per_frag -= crypt->ops->extra_prefix_len +
 668                                crypt->ops->extra_postfix_len;
 669
 670                /* Number of fragments is the total bytes_per_frag /
 671                 * payload_per_fragment
 672                 */
 673                nr_frags = bytes / bytes_per_frag;
 674                bytes_last_frag = bytes % bytes_per_frag;
 675                if (bytes_last_frag)
 676                        nr_frags++;
 677                else
 678                        bytes_last_frag = bytes_per_frag;
 679
 680                /* When we allocate the TXB we allocate enough space for the reserve
 681                 * and full fragment bytes (bytes_per_frag doesn't include prefix,
 682                 * postfix, header, FCS, etc.)
 683                 */
 684                txb = ieee80211_alloc_txb(nr_frags, frag_size + ieee->tx_headroom, GFP_ATOMIC);
 685                if (unlikely(!txb)) {
 686                        netdev_warn(ieee->dev, "Could not allocate TXB\n");
 687                        goto failed;
 688                }
 689                txb->encrypted = encrypt;
 690                txb->payload_size = __cpu_to_le16(bytes);
 691
 692                //if (ieee->current_network.QoS_Enable)
 693                if (qos_actived)
 694                        txb->queue_index = UP2AC(skb->priority);
 695                else
 696                        txb->queue_index = WME_AC_BK;
 697
 698
 699
 700                for (i = 0; i < nr_frags; i++) {
 701                        skb_frag = txb->fragments[i];
 702                        tcb_desc = (struct cb_desc *)(skb_frag->cb + MAX_DEV_ADDR_SIZE);
 703                        if (qos_actived) {
 704                                skb_frag->priority = skb->priority;//UP2AC(skb->priority);
 705                                tcb_desc->queue_index =  UP2AC(skb->priority);
 706                        } else {
 707                                skb_frag->priority = WME_AC_BK;
 708                                tcb_desc->queue_index = WME_AC_BK;
 709                        }
 710                        skb_reserve(skb_frag, ieee->tx_headroom);
 711
 712                        if (encrypt) {
 713                                if (ieee->hwsec_active)
 714                                        tcb_desc->bHwSec = 1;
 715                                else
 716                                        tcb_desc->bHwSec = 0;
 717                                skb_reserve(skb_frag, crypt->ops->extra_prefix_len);
 718                        } else {
 719                                tcb_desc->bHwSec = 0;
 720                        }
 721                        frag_hdr = skb_put_data(skb_frag, &header, hdr_len);
 722
 723                        /* If this is not the last fragment, then add the MOREFRAGS
 724                         * bit to the frame control
 725                         */
 726                        if (i != nr_frags - 1) {
 727                                frag_hdr->frame_ctl = cpu_to_le16(
 728                                        fc | IEEE80211_FCTL_MOREFRAGS);
 729                                bytes = bytes_per_frag;
 730
 731                        } else {
 732                                /* The last fragment takes the remaining length */
 733                                bytes = bytes_last_frag;
 734                        }
 735                        //if(ieee->current_network.QoS_Enable)
 736                        if (qos_actived) {
 737                                // add 1 only indicate to corresponding seq number control 2006/7/12
 738                                frag_hdr->seq_ctl = cpu_to_le16(ieee->seq_ctrl[UP2AC(skb->priority) + 1] << 4 | i);
 739                        } else {
 740                                frag_hdr->seq_ctl = cpu_to_le16(ieee->seq_ctrl[0] << 4 | i);
 741                        }
 742
 743                        /* Put a SNAP header on the first fragment */
 744                        if (i == 0) {
 745                                ieee80211_put_snap(
 746                                        skb_put(skb_frag, SNAP_SIZE + sizeof(u16)),
 747                                        ether_type);
 748                                bytes -= SNAP_SIZE + sizeof(u16);
 749                        }
 750
 751                        skb_put_data(skb_frag, skb->data, bytes);
 752
 753                        /* Advance the SKB... */
 754                        skb_pull(skb, bytes);
 755
 756                        /* Encryption routine will move the header forward in order
 757                         * to insert the IV between the header and the payload
 758                         */
 759                        if (encrypt)
 760                                ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len);
 761                        if (ieee->config &
 762                        (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
 763                                skb_put(skb_frag, 4);
 764                }
 765
 766                if (qos_actived) {
 767                        if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF)
 768                                ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0;
 769                        else
 770                                ieee->seq_ctrl[UP2AC(skb->priority) + 1]++;
 771                } else {
 772                        if (ieee->seq_ctrl[0] == 0xFFF)
 773                                ieee->seq_ctrl[0] = 0;
 774                        else
 775                                ieee->seq_ctrl[0]++;
 776                }
 777        } else {
 778                if (unlikely(skb->len < sizeof(struct rtl_80211_hdr_3addr))) {
 779                        netdev_warn(ieee->dev, "skb too small (%d).\n",
 780                                    skb->len);
 781                        goto success;
 782                }
 783
 784                txb = ieee80211_alloc_txb(1, skb->len, GFP_ATOMIC);
 785                if (!txb) {
 786                        netdev_warn(ieee->dev, "Could not allocate TXB\n");
 787                        goto failed;
 788                }
 789
 790                txb->encrypted = 0;
 791                txb->payload_size = __cpu_to_le16(skb->len);
 792                skb_put_data(txb->fragments[0], skb->data, skb->len);
 793        }
 794
 795 success:
 796//WB add to fill data tcb_desc here. only first fragment is considered, need to change, and you may remove to other place.
 797        if (txb) {
 798                struct cb_desc *tcb_desc = (struct cb_desc *)(txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE);
 799                tcb_desc->bTxEnableFwCalcDur = 1;
 800                if (is_multicast_ether_addr(header.addr1))
 801                        tcb_desc->bMulticast = 1;
 802                if (is_broadcast_ether_addr(header.addr1))
 803                        tcb_desc->bBroadcast = 1;
 804                ieee80211_txrate_selectmode(ieee, tcb_desc);
 805                if (tcb_desc->bMulticast ||  tcb_desc->bBroadcast)
 806                        tcb_desc->data_rate = ieee->basic_rate;
 807                else
 808                        tcb_desc->data_rate = CURRENT_RATE(ieee->mode, ieee->rate, ieee->HTCurrentOperaRate);
 809                ieee80211_qurey_ShortPreambleMode(ieee, tcb_desc);
 810                ieee80211_tx_query_agg_cap(ieee, txb->fragments[0], tcb_desc);
 811                ieee80211_query_HTCapShortGI(ieee, tcb_desc);
 812                ieee80211_query_BandwidthMode(ieee, tcb_desc);
 813                ieee80211_query_protectionmode(ieee, tcb_desc, txb->fragments[0]);
 814                ieee80211_query_seqnum(ieee, txb->fragments[0], header.addr1);
 815        }
 816        spin_unlock_irqrestore(&ieee->lock, flags);
 817        dev_kfree_skb_any(skb);
 818        if (txb) {
 819                if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) {
 820                        ieee80211_softmac_xmit(txb, ieee);
 821                } else {
 822                        if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
 823                                stats->tx_packets++;
 824                                stats->tx_bytes += __le16_to_cpu(txb->payload_size);
 825                                return 0;
 826                        }
 827                        ieee80211_txb_free(txb);
 828                }
 829        }
 830
 831        return 0;
 832
 833 failed:
 834        spin_unlock_irqrestore(&ieee->lock, flags);
 835        netif_stop_queue(dev);
 836        stats->tx_errors++;
 837        return 1;
 838
 839}
 840