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