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