drivers/staging/rtl8192e/rtllib_tx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright(c) 2003 - 2004 Intel Corporation. All rights reserved.
   4  *
   5  * Contact Information:
   6  * James P. Ketrenos <[email protected]>
   7  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   8  *
   9  * Few modifications for Realtek's Wi-Fi drivers by
  10  * Andrea Merello <[email protected]>
  11  *
  12  * A special thanks goes to Realtek for their support !
  13  */
  14 #include <linux/compiler.h>
  15 #include <linux/errno.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/in6.h>
  18 #include <linux/in.h>
  19 #include <linux/ip.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/pci.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/slab.h>
  27 #include <linux/tcp.h>
  28 #include <linux/types.h>
  29 #include <linux/wireless.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/if_vlan.h>
  33
  34 #include "rtllib.h"
  35
  36 /* 802.11 Data Frame
  37  *
  38  *
  39  * 802.11 frame_control for data frames - 2 bytes
  40  *      ,--------------------------------------------------------------------.
  41  * bits | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |  9 |  a |  b  |  c  |  d  | e  |
  42  *      |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----|
  43  * val  | 0 | 0 | 0 | 1 | x | 0 | 0 | 0 | 1 |  0 |  x |  x  |  x  |  x  | x  |
  44  *      |---|---|---|---|---|---|---|---|---|----|----|-----|-----|-----|----|
  45  * desc |  ver  | type  |  ^-subtype-^  |to |from|more|retry| pwr |more |wep |
  46  *      |       |       | x=0 data      |DS | DS |frag|     | mgm |data |    |
  47  *      |       |       | x=1 data+ack  |   |    |    |     |     |     |    |
  48  *      '--------------------------------------------------------------------'
  49  *                                           /\
  50  *                                           |
  51  * 802.11 Data Frame                         |
  52  *          ,--------- 'ctrl' expands to >---'
  53  *          |
  54  *       ,--'---,-------------------------------------------------------------.
  55  * Bytes |  2   |  2   |    6    |    6    |    6    |  2   | 0..2312 |   4  |
  56  *       |------|------|---------|---------|---------|------|---------|------|
  57  * Desc. | ctrl | dura |  DA/RA  |   TA    |    SA   | Sequ |  Frame  |  fcs |
  58  *       |      | tion | (BSSID) |         |         | ence |  data   |      |
  59  *       `--------------------------------------------------|         |------'
  60  * Total: 28 non-data bytes                                 `----.----'
  61  *                                                               |
  62  *        .- 'Frame data' expands to <---------------------------'
  63  *        |
  64  *        V
  65  *       ,---------------------------------------------------.
  66  * Bytes |  1   |  1   |    1    |    3     |  2   |  0-2304 |
  67  *       |------|------|---------|----------|------|---------|
  68  * Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP      |
  69  *       | DSAP | SSAP |         |          |      | Packet  |
  70  *       | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8|      |         |
  71  *       `-----------------------------------------|         |
  72  * Total: 8 non-data bytes                         `----.----'
  73  *                                                      |
  74  *        .- 'IP Packet' expands, if WEP enabled, to <--'
  75  *        |
  76  *        V
  77  *       ,-----------------------.
  78  * Bytes |  4  |   0-2296  |  4  |
  79  *       |-----|-----------|-----|
  80  * Desc. | IV  | Encrypted | ICV |
  81  *       |     | IP Packet |     |
  82  *       `-----------------------'
  83  * Total: 8 non-data bytes
  84  *
  85  *
  86  * 802.3 Ethernet Data Frame
  87  *
  88  *       ,-----------------------------------------.
  89  * Bytes |   6   |   6   |  2   |  Variable |   4  |
  90  *       |-------|-------|------|-----------|------|
  91  * Desc. | Dest. | Source| Type | IP Packet |  fcs |
  92  *       |  MAC  |  MAC  |      |          |      |
  93  *       `-----------------------------------------'
  94  * Total: 18 non-data bytes
  95  *
  96  * In the event that fragmentation is required, the incoming payload is split
  97  * into N parts of size ieee->fts.  The first fragment contains the SNAP header
  98  * and the remaining packets are just data.
  99  *
 100  * If encryption is enabled, each fragment payload size is reduced by enough
 101  * space to add the prefix and postfix (IV and ICV totalling 8 bytes in
 102  * the case of WEP) So if you have 1500 bytes of payload with ieee->fts set to
 103  * 500 without encryption it will take 3 frames.  With WEP it will take 4 frames
 104  * as the payload of each frame is reduced to 492 bytes.
 105  *
 106  * SKB visualization
 107  *
 108  * ,- skb->data
 109  * |
 110  * |    ETHERNET HEADER        ,-<-- PAYLOAD
 111  * |                           |     14 bytes from skb->data
 112  * |  2 bytes for Type --> ,T. |     (sizeof ethhdr)
 113  * |                       | | |
 114  * |,-Dest.--. ,--Src.---. | | |
 115  * |  6 bytes| | 6 bytes | | | |
 116  * v         | |         | | | |
 117  * 0         | v       1 | v | v           2
 118  * 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
 119  *     ^     | ^         | ^ |
 120  *     |     | |         | | |
 121  *     |     | |         | `T' <---- 2 bytes for Type
 122  *     |     | |         |
 123  *     |     | '---SNAP--' <-------- 6 bytes for SNAP
 124  *     |     |
 125  *     `-IV--' <-------------------- 4 bytes for IV (WEP)
 126  *
 127  *      SNAP HEADER
 128  *
 129  */
 130
 131 static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
 132 static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };
 133
 134 static int rtllib_put_snap(u8 *data, u16 h_proto)
 135 {
 136         struct rtllib_snap_hdr *snap;
 137         u8 *oui;
 138
 139         snap = (struct rtllib_snap_hdr *)data;
 140         snap->dsap = 0xaa;
 141         snap->ssap = 0xaa;
 142         snap->ctrl = 0x03;
 143
 144         if (h_proto == 0x8137 || h_proto == 0x80f3)
 145                 oui = P802_1H_OUI;
 146         else
 147                 oui = RFC1042_OUI;
 148         snap->oui[0] = oui[0];
 149         snap->oui[1] = oui[1];
 150         snap->oui[2] = oui[2];
 151
 152         *(__be16 *)(data + SNAP_SIZE) = htons(h_proto);
 153
 154         return SNAP_SIZE + sizeof(u16);
 155 }
 156
 157 int rtllib_encrypt_fragment(struct rtllib_device *ieee, struct sk_buff *frag,
 158                             int hdr_len)
 159 {
 160         struct lib80211_crypt_data *crypt = NULL;
 161         int res;
 162
 163         crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
 164
 165         if (!(crypt && crypt->ops)) {
 166                 netdev_info(ieee->dev, "=========>%s(), crypt is null\n",
 167                             __func__);
 168                 return -1;
 169         }
 170         /* To encrypt, frame format is:
 171          * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes)
 172          */
 173
 174         /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
 175          * call both MSDU and MPDU encryption functions from here.
 176          */
 177         atomic_inc(&crypt->refcnt);
 178         res = 0;
 179         if (crypt->ops->encrypt_msdu)
 180                 res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv);
 181         if (res == 0 && crypt->ops->encrypt_mpdu)
 182                 res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);
 183
 184         atomic_dec(&crypt->refcnt);
 185         if (res < 0) {
 186                 netdev_info(ieee->dev, "%s: Encryption failed: len=%d.\n",
 187                             ieee->dev->name, frag->len);
 188                 return -1;
 189         }
 190
 191         return 0;
 192 }
 193
 194 void rtllib_txb_free(struct rtllib_txb *txb)
 195 {
 196         if (unlikely(!txb))
 197                 return;
 198         kfree(txb);
 199 }
 200
 201 static struct rtllib_txb *rtllib_alloc_txb(int nr_frags, int txb_size,
 202                                            gfp_t gfp_mask)
 203 {
 204         struct rtllib_txb *txb;
 205         int i;
 206
 207         txb = kzalloc(struct_size(txb, fragments, nr_frags), gfp_mask);
 208         if (!txb)
 209                 return NULL;
 210
 211         txb->nr_frags = nr_frags;
 212         txb->frag_size = cpu_to_le16(txb_size);
 213
 214         for (i = 0; i < nr_frags; i++) {
 215                 txb->fragments[i] = dev_alloc_skb(txb_size);
 216                 if (unlikely(!txb->fragments[i]))
 217                         goto err_free;
 218                 memset(txb->fragments[i]->cb, 0, sizeof(txb->fragments[i]->cb));
 219         }
 220
 221         return txb;
 222
 223 err_free:
 224         while (--i >= 0)
 225                 dev_kfree_skb_any(txb->fragments[i]);
 226         kfree(txb);
 227
 228         return NULL;
 229 }
 230
 231 static int rtllib_classify(struct sk_buff *skb, u8 bIsAmsdu)
 232 {
 233         struct ethhdr *eth;
 234         struct iphdr *ip;
 235
 236         eth = (struct ethhdr *)skb->data;
 237         if (eth->h_proto != htons(ETH_P_IP))
 238                 return 0;
 239
 240 #ifdef VERBOSE_DEBUG
 241         print_hex_dump_bytes("%s: ", __func__, DUMP_PREFIX_NONE, skb->data,
 242                              skb->len);
 243 #endif
 244         ip = ip_hdr(skb);
 245         switch (ip->tos & 0xfc) {
 246         case 0x20:
 247                 return 2;
 248         case 0x40:
 249                 return 1;
 250         case 0x60:
 251                 return 3;
 252         case 0x80:
 253                 return 4;
 254         case 0xa0:
 255                 return 5;
 256         case 0xc0:
 257                 return 6;
 258         case 0xe0:
 259                 return 7;
 260         default:
 261                 return 0;
 262         }
 263 }
 264
 265 static void rtllib_tx_query_agg_cap(struct rtllib_device *ieee,
 266                                     struct sk_buff *skb,
 267                                     struct cb_desc *tcb_desc)
 268 {
 269         struct rt_hi_throughput *ht_info = ieee->ht_info;
 270         struct tx_ts_record *pTxTs = NULL;
 271         struct rtllib_hdr_1addr *hdr = (struct rtllib_hdr_1addr *)skb->data;
 272
 273         if (rtllib_act_scanning(ieee, false))
 274                 return;
 275
 276         if (!ht_info->bCurrentHTSupport || !ht_info->enable_ht)
 277                 return;
 278         if (!IsQoSDataFrame(skb->data))
 279                 return;
 280         if (is_multicast_ether_addr(hdr->addr1))
 281                 return;
 282
 283         if (tcb_desc->bdhcp || ieee->CntAfterLink < 2)
 284                 return;
 285
 286         if (ht_info->iot_action & HT_IOT_ACT_TX_NO_AGGREGATION)
 287                 return;
 288
 289         if (!ieee->GetNmodeSupportBySecCfg(ieee->dev))
 290                 return;
 291         if (ht_info->bCurrentAMPDUEnable) {
 292                 if (!GetTs(ieee, (struct ts_common_info **)(&pTxTs), hdr->addr1,
 293                            skb->priority, TX_DIR, true)) {
 294                         netdev_info(ieee->dev, "%s: can't get TS\n", __func__);
 295                         return;
 296                 }
 297                 if (!pTxTs->TxAdmittedBARecord.b_valid) {
 298                         if (ieee->wpa_ie_len && (ieee->pairwise_key_type ==
 299                             KEY_TYPE_NA)) {
 300                                 ;
 301                         } else if (tcb_desc->bdhcp == 1) {
 302                                 ;
 303                         } else if (!pTxTs->bDisable_AddBa) {
 304                                 TsStartAddBaProcess(ieee, pTxTs);
 305                         }
 306                         goto FORCED_AGG_SETTING;
 307                 } else if (!pTxTs->bUsingBa) {
 308                         if (SN_LESS(pTxTs->TxAdmittedBARecord.ba_start_seq_ctrl.field.seq_num,
 309                                     (pTxTs->TxCurSeq + 1) % 4096))
 310                                 pTxTs->bUsingBa = true;
 311                         else
 312                                 goto FORCED_AGG_SETTING;
 313                 }
 314                 if (ieee->iw_mode == IW_MODE_INFRA) {
 315                         tcb_desc->bAMPDUEnable = true;
 316                         tcb_desc->ampdu_factor = ht_info->CurrentAMPDUFactor;
 317                         tcb_desc->ampdu_density = ht_info->current_mpdu_density;
 318                 }
 319         }
 320 FORCED_AGG_SETTING:
 321         switch (ht_info->ForcedAMPDUMode) {
 322         case HT_AGG_AUTO:
 323                 break;
 324
 325         case HT_AGG_FORCE_ENABLE:
 326                 tcb_desc->bAMPDUEnable = true;
 327                 tcb_desc->ampdu_density = ht_info->forced_mpdu_density;
 328                 tcb_desc->ampdu_factor = ht_info->forced_ampdu_factor;
 329                 break;
 330
 331         case HT_AGG_FORCE_DISABLE:
 332                 tcb_desc->bAMPDUEnable = false;
 333                 tcb_desc->ampdu_density = 0;
 334                 tcb_desc->ampdu_factor = 0;
 335                 break;
 336         }
 337 }
 338
 339 static void rtllib_query_ShortPreambleMode(struct rtllib_device *ieee,
 340                                            struct cb_desc *tcb_desc)
 341 {
 342         tcb_desc->bUseShortPreamble = false;
 343         if (tcb_desc->data_rate == 2)
 344                 return;
 345         else if (ieee->current_network.capability &
 346                  WLAN_CAPABILITY_SHORT_PREAMBLE)
 347                 tcb_desc->bUseShortPreamble = true;
 348 }
 349
 350 static void rtllib_query_HTCapShortGI(struct rtllib_device *ieee,
 351                                       struct cb_desc *tcb_desc)
 352 {
 353         struct rt_hi_throughput *ht_info = ieee->ht_info;
 354
 355         tcb_desc->bUseShortGI           = false;
 356
 357         if (!ht_info->bCurrentHTSupport || !ht_info->enable_ht)
 358                 return;
 359
 360         if (ht_info->forced_short_gi) {
 361                 tcb_desc->bUseShortGI = true;
 362                 return;
 363         }
 364
 365         if (ht_info->bCurBW40MHz && ht_info->bCurShortGI40MHz)
 366                 tcb_desc->bUseShortGI = true;
 367         else if (!ht_info->bCurBW40MHz && ht_info->bCurShortGI20MHz)
 368                 tcb_desc->bUseShortGI = true;
 369 }
 370
 371 static void rtllib_query_BandwidthMode(struct rtllib_device *ieee,
 372                                        struct cb_desc *tcb_desc)
 373 {
 374         struct rt_hi_throughput *ht_info = ieee->ht_info;
 375
 376         tcb_desc->bPacketBW = false;
 377
 378         if (!ht_info->bCurrentHTSupport || !ht_info->enable_ht)
 379                 return;
 380
 381         if (tcb_desc->bMulticast || tcb_desc->bBroadcast)
 382                 return;
 383
 384         if ((tcb_desc->data_rate & 0x80) == 0)
 385                 return;
 386         if (ht_info->bCurBW40MHz && ht_info->cur_tx_bw40mhz &&
 387             !ieee->bandwidth_auto_switch.bforced_tx20Mhz)
 388                 tcb_desc->bPacketBW = true;
 389 }
 390
 391 static void rtllib_query_protectionmode(struct rtllib_device *ieee,
 392                                         struct cb_desc *tcb_desc,
 393                                         struct sk_buff *skb)
 394 {
 395         struct rt_hi_throughput *ht_info;
 396
 397         tcb_desc->bRTSSTBC                      = false;
 398         tcb_desc->bRTSUseShortGI                = false;
 399         tcb_desc->bCTSEnable                    = false;
 400         tcb_desc->RTSSC                         = 0;
 401         tcb_desc->bRTSBW                        = false;
 402
 403         if (tcb_desc->bBroadcast || tcb_desc->bMulticast)
 404                 return;
 405
 406         if (is_broadcast_ether_addr(skb->data + 16))
 407                 return;
 408
 409         if (ieee->mode < IEEE_N_24G) {
 410                 if (skb->len > ieee->rts) {
 411                         tcb_desc->bRTSEnable = true;
 412                         tcb_desc->rts_rate = MGN_24M;
 413                 } else if (ieee->current_network.buseprotection) {
 414                         tcb_desc->bRTSEnable = true;
 415                         tcb_desc->bCTSEnable = true;
 416                         tcb_desc->rts_rate = MGN_24M;
 417                 }
 418                 return;
 419         }
 420
 421         ht_info = ieee->ht_info;
 422
 423         while (true) {
 424                 if (ht_info->iot_action & HT_IOT_ACT_FORCED_CTS2SELF) {
 425                         tcb_desc->bCTSEnable    = true;
 426                         tcb_desc->rts_rate  =   MGN_24M;
 427                         tcb_desc->bRTSEnable = true;
 428                         break;
 429                 } else if (ht_info->iot_action & (HT_IOT_ACT_FORCED_RTS |
 430                            HT_IOT_ACT_PURE_N_MODE)) {
 431                         tcb_desc->bRTSEnable = true;
 432                         tcb_desc->rts_rate  =   MGN_24M;
 433                         break;
 434                 }
 435                 if (ieee->current_network.buseprotection) {
 436                         tcb_desc->bRTSEnable = true;
 437                         tcb_desc->bCTSEnable = true;
 438                         tcb_desc->rts_rate = MGN_24M;
 439                         break;
 440                 }
 441                 if (ht_info->bCurrentHTSupport  && ht_info->enable_ht) {
 442                         u8 HTOpMode = ht_info->current_op_mode;
 443
 444                         if ((ht_info->bCurBW40MHz && (HTOpMode == 2 ||
 445                                                       HTOpMode == 3)) ||
 446                              (!ht_info->bCurBW40MHz && HTOpMode == 3)) {
 447                                 tcb_desc->rts_rate = MGN_24M;
 448                                 tcb_desc->bRTSEnable = true;
 449                                 break;
 450                         }
 451                 }
 452                 if (skb->len > ieee->rts) {
 453                         tcb_desc->rts_rate = MGN_24M;
 454                         tcb_desc->bRTSEnable = true;
 455                         break;
 456                 }
 457                 if (tcb_desc->bAMPDUEnable) {
 458                         tcb_desc->rts_rate = MGN_24M;
 459                         tcb_desc->bRTSEnable = false;
 460                         break;
 461                 }
 462                 goto NO_PROTECTION;
 463         }
 464         if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
 465                 tcb_desc->bUseShortPreamble = true;
 466         if (ieee->iw_mode == IW_MODE_MASTER)
 467                 goto NO_PROTECTION;
 468         return;
 469 NO_PROTECTION:
 470         tcb_desc->bRTSEnable    = false;
 471         tcb_desc->bCTSEnable    = false;
 472         tcb_desc->rts_rate      = 0;
 473         tcb_desc->RTSSC         = 0;
 474         tcb_desc->bRTSBW        = false;
 475 }
 476
 477 static void rtllib_txrate_selectmode(struct rtllib_device *ieee,
 478                                      struct cb_desc *tcb_desc)
 479 {
 480         if (ieee->tx_dis_rate_fallback)
 481                 tcb_desc->tx_dis_rate_fallback = true;
 482
 483         if (ieee->tx_use_drv_assinged_rate)
 484                 tcb_desc->tx_use_drv_assinged_rate = true;
 485         if (!tcb_desc->tx_dis_rate_fallback ||
 486             !tcb_desc->tx_use_drv_assinged_rate) {
 487                 if (ieee->iw_mode == IW_MODE_INFRA ||
 488                     ieee->iw_mode == IW_MODE_ADHOC)
 489                         tcb_desc->RATRIndex = 0;
 490         }
 491 }
 492
 493 static u16 rtllib_query_seqnum(struct rtllib_device *ieee, struct sk_buff *skb,
 494                                u8 *dst)
 495 {
 496         u16 seqnum = 0;
 497
 498         if (is_multicast_ether_addr(dst))
 499                 return 0;
 500         if (IsQoSDataFrame(skb->data)) {
 501                 struct tx_ts_record *pTS = NULL;
 502
 503                 if (!GetTs(ieee, (struct ts_common_info **)(&pTS), dst,
 504                            skb->priority, TX_DIR, true))
 505                         return 0;
 506                 seqnum = pTS->TxCurSeq;
 507                 pTS->TxCurSeq = (pTS->TxCurSeq + 1) % 4096;
 508                 return seqnum;
 509         }
 510         return 0;
 511 }
 512
 513 static int wme_downgrade_ac(struct sk_buff *skb)
 514 {
 515         switch (skb->priority) {
 516         case 6:
 517         case 7:
 518                 skb->priority = 5; /* VO -> VI */
 519                 return 0;
 520         case 4:
 521         case 5:
 522                 skb->priority = 3; /* VI -> BE */
 523                 return 0;
 524         case 0:
 525         case 3:
 526                 skb->priority = 1; /* BE -> BK */
 527                 return 0;
 528         default:
 529                 return -1;
 530         }
 531 }
 532
 533 static u8 rtllib_current_rate(struct rtllib_device *ieee)
 534 {
 535         if (ieee->mode & IEEE_MODE_MASK)
 536                 return ieee->rate;
 537
 538         if (ieee->HTCurrentOperaRate)
 539                 return ieee->HTCurrentOperaRate;
 540         else
 541                 return ieee->rate & 0x7F;
 542 }
 543
 544 static int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
 545 {
 546         struct rtllib_device *ieee = (struct rtllib_device *)
 547                                      netdev_priv_rsl(dev);
 548         struct rtllib_txb *txb = NULL;
 549         struct rtllib_hdr_3addrqos *frag_hdr;
 550         int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
 551         unsigned long flags;
 552         struct net_device_stats *stats = &ieee->stats;
 553         int ether_type = 0, encrypt;
 554         int bytes, fc, qos_ctl = 0, hdr_len;
 555         struct sk_buff *skb_frag;
 556         struct rtllib_hdr_3addrqos header = { /* Ensure zero initialized */
 557                 .duration_id = 0,
 558                 .seq_ctl = 0,
 559                 .qos_ctl = 0
 560         };
 561         int qos_activated = ieee->current_network.qos_data.active;
 562         u8 dest[ETH_ALEN];
 563         u8 src[ETH_ALEN];
 564         struct lib80211_crypt_data *crypt = NULL;
 565         struct cb_desc *tcb_desc;
 566         u8 bIsMulticast = false;
 567         u8 IsAmsdu = false;
 568         bool    bdhcp = false;
 569
 570         spin_lock_irqsave(&ieee->lock, flags);
 571
 572         /* If there is no driver handler to take the TXB, don't bother
 573          * creating it...
 574          */
 575         if ((!ieee->hard_start_xmit && !(ieee->softmac_features &
 576            IEEE_SOFTMAC_TX_QUEUE)) ||
 577            ((!ieee->softmac_data_hard_start_xmit &&
 578            (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) {
 579                 netdev_warn(ieee->dev, "No xmit handler.\n");
 580                 goto success;
 581         }
 582
 583         if (likely(ieee->raw_tx == 0)) {
 584                 if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
 585                         netdev_warn(ieee->dev, "skb too small (%d).\n",
 586                                     skb->len);
 587                         goto success;
 588                 }
 589                 /* Save source and destination addresses */
 590                 ether_addr_copy(dest, skb->data);
 591                 ether_addr_copy(src, skb->data + ETH_ALEN);
 592
 593                 memset(skb->cb, 0, sizeof(skb->cb));
 594                 ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);
 595
 596                 if (ieee->iw_mode == IW_MODE_MONITOR) {
 597                         txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
 598                         if (unlikely(!txb)) {
 599                                 netdev_warn(ieee->dev,
 600                                             "Could not allocate TXB\n");
 601                                 goto failed;
 602                         }
 603
 604                         txb->encrypted = 0;
 605                         txb->payload_size = cpu_to_le16(skb->len);
 606                         skb_put_data(txb->fragments[0], skb->data, skb->len);
 607
 608                         goto success;
 609                 }
 610
 611                 if (skb->len > 282) {
 612                         if (ether_type == ETH_P_IP) {
 613                                 const struct iphdr *ip = (struct iphdr *)
 614                                         ((u8 *)skb->data + 14);
 615                                 if (ip->protocol == IPPROTO_UDP) {
 616                                         struct udphdr *udp;
 617
 618                                         udp = (struct udphdr *)((u8 *)ip +
 619                                               (ip->ihl << 2));
 620                                         if (((((u8 *)udp)[1] == 68) &&
 621                                              (((u8 *)udp)[3] == 67)) ||
 622                                            ((((u8 *)udp)[1] == 67) &&
 623                                            (((u8 *)udp)[3] == 68))) {
 624                                                 bdhcp = true;
 625                                                 ieee->LPSDelayCnt = 200;
 626                                         }
 627                                 }
 628                         } else if (ether_type == ETH_P_ARP) {
 629                                 netdev_info(ieee->dev,
 630                                             "=================>DHCP Protocol start tx ARP pkt!!\n");
 631                                 bdhcp = true;
 632                                 ieee->LPSDelayCnt =
 633                                          ieee->current_network.tim.tim_count;
 634                         }
 635                 }
 636
 637                 skb->priority = rtllib_classify(skb, IsAmsdu);
 638                 crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
 639                 encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
 640                         ieee->host_encrypt && crypt && crypt->ops;
 641                 if (!encrypt && ieee->ieee802_1x &&
 642                     ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
 643                         stats->tx_dropped++;
 644                         goto success;
 645                 }
 646                 if (crypt && !encrypt && ether_type == ETH_P_PAE) {
 647                         struct eapol *eap = (struct eapol *)(skb->data +
 648                                 sizeof(struct ethhdr) - SNAP_SIZE -
 649                                 sizeof(u16));
 650                         netdev_dbg(ieee->dev,
 651                                    "TX: IEEE 802.11 EAPOL frame: %s\n",
 652                                    eap_get_type(eap->type));
 653                 }
 654
 655                 /* Advance the SKB to the start of the payload */
 656                 skb_pull(skb, sizeof(struct ethhdr));
 657
 658                 /* Determine total amount of storage required for TXB packets */
 659                 bytes = skb->len + SNAP_SIZE + sizeof(u16);
 660
 661                 if (encrypt)
 662                         fc = RTLLIB_FTYPE_DATA | RTLLIB_FCTL_WEP;
 663                 else
 664                         fc = RTLLIB_FTYPE_DATA;
 665
 666                 if (qos_activated)
 667                         fc |= RTLLIB_STYPE_QOS_DATA;
 668                 else
 669                         fc |= RTLLIB_STYPE_DATA;
 670
 671                 if (ieee->iw_mode == IW_MODE_INFRA) {
 672                         fc |= RTLLIB_FCTL_TODS;
 673                         /* To DS: Addr1 = BSSID, Addr2 = SA,
 674                          * Addr3 = DA
 675                          */
 676                         ether_addr_copy(header.addr1,
 677                                         ieee->current_network.bssid);
 678                         ether_addr_copy(header.addr2, src);
 679                         if (IsAmsdu)
 680                                 ether_addr_copy(header.addr3,
 681                                                 ieee->current_network.bssid);
 682                         else
 683                                 ether_addr_copy(header.addr3, dest);
 684                 } else if (ieee->iw_mode == IW_MODE_ADHOC) {
 685                         /* not From/To DS: Addr1 = DA, Addr2 = SA,
 686                          * Addr3 = BSSID
 687                          */
 688                         ether_addr_copy(header.addr1, dest);
 689                         ether_addr_copy(header.addr2, src);
 690                         ether_addr_copy(header.addr3,
 691                                         ieee->current_network.bssid);
 692                 }
 693
 694                 bIsMulticast = is_multicast_ether_addr(header.addr1);
 695
 696                 header.frame_ctl = cpu_to_le16(fc);
 697
 698                 /* Determine fragmentation size based on destination (multicast
 699                  * and broadcast are not fragmented)
 700                  */
 701                 if (bIsMulticast) {
 702                         frag_size = MAX_FRAG_THRESHOLD;
 703                         qos_ctl |= QOS_CTL_NOTCONTAIN_ACK;
 704                 } else {
 705                         frag_size = ieee->fts;
 706                         qos_ctl = 0;
 707                 }
 708
 709                 if (qos_activated) {
 710                         hdr_len = RTLLIB_3ADDR_LEN + 2;
 711
 712                         /* in case we are a client verify acm is not set for this ac */
 713                         while (unlikely(ieee->wmm_acm & (0x01 << skb->priority))) {
 714                                 netdev_info(ieee->dev, "skb->priority = %x\n",
 715                                             skb->priority);
 716                                 if (wme_downgrade_ac(skb))
 717                                         break;
 718                                 netdev_info(ieee->dev, "converted skb->priority = %x\n",
 719                                             skb->priority);
 720                         }
 721
 722                         qos_ctl |= skb->priority;
 723                         header.qos_ctl = cpu_to_le16(qos_ctl & RTLLIB_QOS_TID);
 724
 725                 } else {
 726                         hdr_len = RTLLIB_3ADDR_LEN;
 727                 }
 728                 /* Determine amount of payload per fragment.  Regardless of if
 729                  * this stack is providing the full 802.11 header, one will
 730                  * eventually be affixed to this fragment -- so we must account
 731                  * for it when determining the amount of payload space.
 732                  */
 733                 bytes_per_frag = frag_size - hdr_len;
 734                 if (ieee->config &
 735                    (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 736                         bytes_per_frag -= RTLLIB_FCS_LEN;
 737
 738                 /* Each fragment may need to have room for encrypting
 739                  * pre/postfix
 740                  */
 741                 if (encrypt) {
 742                         bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
 743                                 crypt->ops->extra_mpdu_postfix_len +
 744                                 crypt->ops->extra_msdu_prefix_len +
 745                                 crypt->ops->extra_msdu_postfix_len;
 746                 }
 747                 /* Number of fragments is the total bytes_per_frag /
 748                  * payload_per_fragment
 749                  */
 750                 nr_frags = bytes / bytes_per_frag;
 751                 bytes_last_frag = bytes % bytes_per_frag;
 752                 if (bytes_last_frag)
 753                         nr_frags++;
 754                 else
 755                         bytes_last_frag = bytes_per_frag;
 756
 757                 /* When we allocate the TXB we allocate enough space for the
 758                  * reserve and full fragment bytes (bytes_per_frag doesn't
 759                  * include prefix, postfix, header, FCS, etc.)
 760                  */
 761                 txb = rtllib_alloc_txb(nr_frags, frag_size +
 762                                        ieee->tx_headroom, GFP_ATOMIC);
 763                 if (unlikely(!txb)) {
 764                         netdev_warn(ieee->dev, "Could not allocate TXB\n");
 765                         goto failed;
 766                 }
 767                 txb->encrypted = encrypt;
 768                 txb->payload_size = cpu_to_le16(bytes);
 769
 770                 if (qos_activated)
 771                         txb->queue_index = UP2AC(skb->priority);
 772                 else
 773                         txb->queue_index = WME_AC_BE;
 774
 775                 for (i = 0; i < nr_frags; i++) {
 776                         skb_frag = txb->fragments[i];
 777                         tcb_desc = (struct cb_desc *)(skb_frag->cb +
 778                                     MAX_DEV_ADDR_SIZE);
 779                         if (qos_activated) {
 780                                 skb_frag->priority = skb->priority;
 781                                 tcb_desc->queue_index =  UP2AC(skb->priority);
 782                         } else {
 783                                 skb_frag->priority = WME_AC_BE;
 784                                 tcb_desc->queue_index = WME_AC_BE;
 785                         }
 786                         skb_reserve(skb_frag, ieee->tx_headroom);
 787
 788                         if (encrypt) {
 789                                 if (ieee->hwsec_active)
 790                                         tcb_desc->bHwSec = 1;
 791                                 else
 792                                         tcb_desc->bHwSec = 0;
 793                                 skb_reserve(skb_frag,
 794                                             crypt->ops->extra_mpdu_prefix_len +
 795                                             crypt->ops->extra_msdu_prefix_len);
 796                         } else {
 797                                 tcb_desc->bHwSec = 0;
 798                         }
 799                         frag_hdr = skb_put_data(skb_frag, &header, hdr_len);
 800
 801                         /* If this is not the last fragment, then add the
 802                          * MOREFRAGS bit to the frame control
 803                          */
 804                         if (i != nr_frags - 1) {
 805                                 frag_hdr->frame_ctl = cpu_to_le16(fc |
 806                                                                   RTLLIB_FCTL_MOREFRAGS);
 807                                 bytes = bytes_per_frag;
 808
 809                         } else {
 810                                 /* The last fragment has the remaining length */
 811                                 bytes = bytes_last_frag;
 812                         }
 813                         if ((qos_activated) && (!bIsMulticast)) {
 814                                 frag_hdr->seq_ctl =
 815                                          cpu_to_le16(rtllib_query_seqnum(ieee, skb_frag,
 816                                                                          header.addr1));
 817                                 frag_hdr->seq_ctl =
 818                                          cpu_to_le16(le16_to_cpu(frag_hdr->seq_ctl) << 4 | i);
 819                         } else {
 820                                 frag_hdr->seq_ctl =
 821                                          cpu_to_le16(ieee->seq_ctrl[0] << 4 | i);
 822                         }
 823                         /* Put a SNAP header on the first fragment */
 824                         if (i == 0) {
 825                                 rtllib_put_snap(skb_put(skb_frag,
 826                                                         SNAP_SIZE +
 827                                                         sizeof(u16)), ether_type);
 828                                 bytes -= SNAP_SIZE + sizeof(u16);
 829                         }
 830
 831                         skb_put_data(skb_frag, skb->data, bytes);
 832
 833                         /* Advance the SKB... */
 834                         skb_pull(skb, bytes);
 835
 836                         /* Encryption routine will move the header forward in
 837                          * order to insert the IV between the header and the
 838                          * payload
 839                          */
 840                         if (encrypt)
 841                                 rtllib_encrypt_fragment(ieee, skb_frag,
 842                                                         hdr_len);
 843                         if (ieee->config &
 844                            (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 845                                 skb_put(skb_frag, 4);
 846                 }
 847
 848                 if ((qos_activated) && (!bIsMulticast)) {
 849                         if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF)
 850                                 ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0;
 851                         else
 852                                 ieee->seq_ctrl[UP2AC(skb->priority) + 1]++;
 853                 } else {
 854                         if (ieee->seq_ctrl[0] == 0xFFF)
 855                                 ieee->seq_ctrl[0] = 0;
 856                         else
 857                                 ieee->seq_ctrl[0]++;
 858                 }
 859         } else {
 860                 if (unlikely(skb->len < sizeof(struct rtllib_hdr_3addr))) {
 861                         netdev_warn(ieee->dev, "skb too small (%d).\n",
 862                                     skb->len);
 863                         goto success;
 864                 }
 865
 866                 txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
 867                 if (!txb) {
 868                         netdev_warn(ieee->dev, "Could not allocate TXB\n");
 869                         goto failed;
 870                 }
 871
 872                 txb->encrypted = 0;
 873                 txb->payload_size = cpu_to_le16(skb->len);
 874                 skb_put_data(txb->fragments[0], skb->data, skb->len);
 875         }
 876
 877  success:
 878         if (txb) {
 879                 tcb_desc = (struct cb_desc *)
 880                                 (txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE);
 881                 tcb_desc->bTxEnableFwCalcDur = 1;
 882                 tcb_desc->priority = skb->priority;
 883
 884                 if (ether_type == ETH_P_PAE) {
 885                         if (ieee->ht_info->iot_action &
 886                             HT_IOT_ACT_WA_IOT_Broadcom) {
 887                                 tcb_desc->data_rate =
 888                                          MgntQuery_TxRateExcludeCCKRates(ieee);
 889                                 tcb_desc->tx_dis_rate_fallback = false;
 890                         } else {
 891                                 tcb_desc->data_rate = ieee->basic_rate;
 892                                 tcb_desc->tx_dis_rate_fallback = 1;
 893                         }
 894
 895                         tcb_desc->RATRIndex = 7;
 896                         tcb_desc->tx_use_drv_assinged_rate = 1;
 897                 } else {
 898                         if (is_multicast_ether_addr(header.addr1))
 899                                 tcb_desc->bMulticast = 1;
 900                         if (is_broadcast_ether_addr(header.addr1))
 901                                 tcb_desc->bBroadcast = 1;
 902                         rtllib_txrate_selectmode(ieee, tcb_desc);
 903                         if (tcb_desc->bMulticast ||  tcb_desc->bBroadcast)
 904                                 tcb_desc->data_rate = ieee->basic_rate;
 905                         else
 906                                 tcb_desc->data_rate = rtllib_current_rate(ieee);
 907
 908                         if (bdhcp) {
 909                                 if (ieee->ht_info->iot_action &
 910                                     HT_IOT_ACT_WA_IOT_Broadcom) {
 911                                         tcb_desc->data_rate =
 912                                            MgntQuery_TxRateExcludeCCKRates(ieee);
 913                                         tcb_desc->tx_dis_rate_fallback = false;
 914                                 } else {
 915                                         tcb_desc->data_rate = MGN_1M;
 916                                         tcb_desc->tx_dis_rate_fallback = 1;
 917                                 }
 918
 919                                 tcb_desc->RATRIndex = 7;
 920                                 tcb_desc->tx_use_drv_assinged_rate = 1;
 921                                 tcb_desc->bdhcp = 1;
 922                         }
 923
 924                         rtllib_query_ShortPreambleMode(ieee, tcb_desc);
 925                         rtllib_tx_query_agg_cap(ieee, txb->fragments[0],
 926                                                 tcb_desc);
 927                         rtllib_query_HTCapShortGI(ieee, tcb_desc);
 928                         rtllib_query_BandwidthMode(ieee, tcb_desc);
 929                         rtllib_query_protectionmode(ieee, tcb_desc,
 930                                                     txb->fragments[0]);
 931                 }
 932         }
 933         spin_unlock_irqrestore(&ieee->lock, flags);
 934         dev_kfree_skb_any(skb);
 935         if (txb) {
 936                 if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) {
 937                         dev->stats.tx_packets++;
 938                         dev->stats.tx_bytes += le16_to_cpu(txb->payload_size);
 939                         rtllib_softmac_xmit(txb, ieee);
 940                 } else {
 941                         if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
 942                                 stats->tx_packets++;
 943                                 stats->tx_bytes += le16_to_cpu(txb->payload_size);
 944                                 return 0;
 945                         }
 946                         rtllib_txb_free(txb);
 947                 }
 948         }
 949
 950         return 0;
 951
 952  failed:
 953         spin_unlock_irqrestore(&ieee->lock, flags);
 954         netif_stop_queue(dev);
 955         stats->tx_errors++;
 956         return 1;
 957 }
 958
 959 netdev_tx_t rtllib_xmit(struct sk_buff *skb, struct net_device *dev)
 960 {
 961         memset(skb->cb, 0, sizeof(skb->cb));
 962         return rtllib_xmit_inter(skb, dev) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
 963 }
 964 EXPORT_SYMBOL(rtllib_xmit);