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)
 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 *ts = NULL;
 271         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 272
 273         if (rtllib_act_scanning(ieee, false))
 274                 return;
 275
 276         if (!ht_info->current_ht_support || !ht_info->enable_ht)
 277                 return;
 278         if (!is_qos_data_frame(skb->data))
 279                 return;
 280         if (is_multicast_ether_addr(hdr->addr1))
 281                 return;
 282
 283         if (tcb_desc->bdhcp || ieee->cnt_after_link < 2)
 284                 return;
 285
 286         if (ht_info->iot_action & HT_IOT_ACT_TX_NO_AGGREGATION)
 287                 return;
 288
 289         if (!ieee->get_nmode_support_by_sec_cfg(ieee->dev))
 290                 return;
 291         if (ht_info->current_ampdu_enable) {
 292                 if (!rtllib_get_ts(ieee, (struct ts_common_info **)(&ts), 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 (!ts->tx_admitted_ba_record.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 (!ts->disable_add_ba) {
 304                                 rtllib_ts_start_add_ba_process(ieee, ts);
 305                         }
 306                         return;
 307                 } else if (!ts->using_ba) {
 308                         if (SN_LESS(ts->tx_admitted_ba_record.ba_start_seq_ctrl.field.seq_num,
 309                                     (ts->tx_cur_seq + 1) % 4096))
 310                                 ts->using_ba = true;
 311                         else
 312                                 return;
 313                 }
 314                 if (ieee->iw_mode == IW_MODE_INFRA) {
 315                         tcb_desc->ampdu_enable = true;
 316                         tcb_desc->ampdu_factor = ht_info->current_ampdu_factor;
 317                         tcb_desc->ampdu_density = ht_info->current_mpdu_density;
 318                 }
 319         }
 320 }
 321
 322 static void rtllib_query_short_preamble_mode(struct rtllib_device *ieee,
 323                                              struct cb_desc *tcb_desc)
 324 {
 325         tcb_desc->use_short_preamble = false;
 326         if (tcb_desc->data_rate == 2)
 327                 return;
 328         else if (ieee->current_network.capability &
 329                  WLAN_CAPABILITY_SHORT_PREAMBLE)
 330                 tcb_desc->use_short_preamble = true;
 331 }
 332
 333 static void rtllib_query_ht_cap_short_gi(struct rtllib_device *ieee,
 334                                          struct cb_desc *tcb_desc)
 335 {
 336         struct rt_hi_throughput *ht_info = ieee->ht_info;
 337
 338         tcb_desc->use_short_gi          = false;
 339
 340         if (!ht_info->current_ht_support || !ht_info->enable_ht)
 341                 return;
 342
 343         if (ht_info->cur_bw_40mhz && ht_info->cur_short_gi_40mhz)
 344                 tcb_desc->use_short_gi = true;
 345         else if (!ht_info->cur_bw_40mhz && ht_info->cur_short_gi_20mhz)
 346                 tcb_desc->use_short_gi = true;
 347 }
 348
 349 static void rtllib_query_bandwidth_mode(struct rtllib_device *ieee,
 350                                         struct cb_desc *tcb_desc)
 351 {
 352         struct rt_hi_throughput *ht_info = ieee->ht_info;
 353
 354         tcb_desc->packet_bw = false;
 355
 356         if (!ht_info->current_ht_support || !ht_info->enable_ht)
 357                 return;
 358
 359         if (tcb_desc->multicast || tcb_desc->broadcast)
 360                 return;
 361
 362         if ((tcb_desc->data_rate & 0x80) == 0)
 363                 return;
 364         if (ht_info->cur_bw_40mhz && ht_info->cur_tx_bw40mhz &&
 365             !ieee->bandwidth_auto_switch.forced_tx_20MHz)
 366                 tcb_desc->packet_bw = true;
 367 }
 368
 369 static void rtllib_query_protectionmode(struct rtllib_device *ieee,
 370                                         struct cb_desc *tcb_desc,
 371                                         struct sk_buff *skb)
 372 {
 373         struct rt_hi_throughput *ht_info;
 374
 375         tcb_desc->rtsstbc                       = false;
 376         tcb_desc->rts_use_short_gi              = false;
 377         tcb_desc->cts_enable                    = false;
 378         tcb_desc->RTSSC                         = 0;
 379         tcb_desc->rts_bw                        = false;
 380
 381         if (tcb_desc->broadcast || tcb_desc->multicast)
 382                 return;
 383
 384         if (is_broadcast_ether_addr(skb->data + 16))
 385                 return;
 386
 387         if (ieee->mode < WIRELESS_MODE_N_24G) {
 388                 if (skb->len > ieee->rts) {
 389                         tcb_desc->rts_enable = true;
 390                         tcb_desc->rts_rate = MGN_24M;
 391                 } else if (ieee->current_network.buseprotection) {
 392                         tcb_desc->rts_enable = true;
 393                         tcb_desc->cts_enable = true;
 394                         tcb_desc->rts_rate = MGN_24M;
 395                 }
 396                 return;
 397         }
 398
 399         ht_info = ieee->ht_info;
 400
 401         while (true) {
 402                 if (ht_info->iot_action & HT_IOT_ACT_FORCED_CTS2SELF) {
 403                         tcb_desc->cts_enable    = true;
 404                         tcb_desc->rts_rate  =   MGN_24M;
 405                         tcb_desc->rts_enable = true;
 406                         break;
 407                 } else if (ht_info->iot_action & (HT_IOT_ACT_FORCED_RTS |
 408                            HT_IOT_ACT_PURE_N_MODE)) {
 409                         tcb_desc->rts_enable = true;
 410                         tcb_desc->rts_rate  =   MGN_24M;
 411                         break;
 412                 }
 413                 if (ieee->current_network.buseprotection) {
 414                         tcb_desc->rts_enable = true;
 415                         tcb_desc->cts_enable = true;
 416                         tcb_desc->rts_rate = MGN_24M;
 417                         break;
 418                 }
 419                 if (ht_info->current_ht_support && ht_info->enable_ht) {
 420                         u8 ht_op_mode = ht_info->current_op_mode;
 421
 422                         if ((ht_info->cur_bw_40mhz && (ht_op_mode == 2 ||
 423                                                        ht_op_mode == 3)) ||
 424                              (!ht_info->cur_bw_40mhz && ht_op_mode == 3)) {
 425                                 tcb_desc->rts_rate = MGN_24M;
 426                                 tcb_desc->rts_enable = true;
 427                                 break;
 428                         }
 429                 }
 430                 if (skb->len > ieee->rts) {
 431                         tcb_desc->rts_rate = MGN_24M;
 432                         tcb_desc->rts_enable = true;
 433                         break;
 434                 }
 435                 if (tcb_desc->ampdu_enable) {
 436                         tcb_desc->rts_rate = MGN_24M;
 437                         tcb_desc->rts_enable = false;
 438                         break;
 439                 }
 440                 goto NO_PROTECTION;
 441         }
 442         if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
 443                 tcb_desc->use_short_preamble = true;
 444         return;
 445 NO_PROTECTION:
 446         tcb_desc->rts_enable    = false;
 447         tcb_desc->cts_enable    = false;
 448         tcb_desc->rts_rate      = 0;
 449         tcb_desc->RTSSC         = 0;
 450         tcb_desc->rts_bw        = false;
 451 }
 452
 453 static void rtllib_txrate_selectmode(struct rtllib_device *ieee,
 454                                      struct cb_desc *tcb_desc)
 455 {
 456         if (ieee->tx_dis_rate_fallback)
 457                 tcb_desc->tx_dis_rate_fallback = true;
 458
 459         if (ieee->tx_use_drv_assinged_rate)
 460                 tcb_desc->tx_use_drv_assinged_rate = true;
 461         if (!tcb_desc->tx_dis_rate_fallback ||
 462             !tcb_desc->tx_use_drv_assinged_rate) {
 463                 if (ieee->iw_mode == IW_MODE_INFRA)
 464                         tcb_desc->ratr_index = 0;
 465         }
 466 }
 467
 468 static u16 rtllib_query_seqnum(struct rtllib_device *ieee, struct sk_buff *skb,
 469                                u8 *dst)
 470 {
 471         u16 seqnum = 0;
 472
 473         if (is_multicast_ether_addr(dst))
 474                 return 0;
 475         if (is_qos_data_frame(skb->data)) {
 476                 struct tx_ts_record *ts = NULL;
 477
 478                 if (!rtllib_get_ts(ieee, (struct ts_common_info **)(&ts), dst,
 479                                    skb->priority, TX_DIR, true))
 480                         return 0;
 481                 seqnum = ts->tx_cur_seq;
 482                 ts->tx_cur_seq = (ts->tx_cur_seq + 1) % 4096;
 483                 return seqnum;
 484         }
 485         return 0;
 486 }
 487
 488 static int wme_downgrade_ac(struct sk_buff *skb)
 489 {
 490         switch (skb->priority) {
 491         case 6:
 492         case 7:
 493                 skb->priority = 5; /* VO -> VI */
 494                 return 0;
 495         case 4:
 496         case 5:
 497                 skb->priority = 3; /* VI -> BE */
 498                 return 0;
 499         case 0:
 500         case 3:
 501                 skb->priority = 1; /* BE -> BK */
 502                 return 0;
 503         default:
 504                 return -1;
 505         }
 506 }
 507
 508 static u8 rtllib_current_rate(struct rtllib_device *ieee)
 509 {
 510         if (ieee->mode & IEEE_MODE_MASK)
 511                 return ieee->rate;
 512
 513         if (ieee->ht_curr_op_rate)
 514                 return ieee->ht_curr_op_rate;
 515         else
 516                 return ieee->rate & 0x7F;
 517 }
 518
 519 static int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
 520 {
 521         struct rtllib_device *ieee = (struct rtllib_device *)
 522                                      netdev_priv_rsl(dev);
 523         struct rtllib_txb *txb = NULL;
 524         struct ieee80211_qos_hdr *frag_hdr;
 525         int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
 526         unsigned long flags;
 527         struct net_device_stats *stats = &ieee->stats;
 528         int ether_type = 0, encrypt;
 529         int bytes, fc, qos_ctl = 0, hdr_len;
 530         struct sk_buff *skb_frag;
 531         struct ieee80211_qos_hdr header = { /* Ensure zero initialized */
 532                 .duration_id = 0,
 533                 .seq_ctrl = 0,
 534                 .qos_ctrl = 0
 535         };
 536         int qos_activated = ieee->current_network.qos_data.active;
 537         u8 dest[ETH_ALEN];
 538         u8 src[ETH_ALEN];
 539         struct lib80211_crypt_data *crypt = NULL;
 540         struct cb_desc *tcb_desc;
 541         u8 is_multicast = false;
 542         bool    bdhcp = false;
 543
 544         spin_lock_irqsave(&ieee->lock, flags);
 545
 546         /* If there is no driver handler to take the TXB, don't bother
 547          * creating it...
 548          */
 549         if (!(ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) ||
 550             ((!ieee->softmac_data_hard_start_xmit &&
 551              (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) {
 552                 netdev_warn(ieee->dev, "No xmit handler.\n");
 553                 goto success;
 554         }
 555
 556         if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
 557                 netdev_warn(ieee->dev, "skb too small (%d).\n",
 558                             skb->len);
 559                 goto success;
 560         }
 561         /* Save source and destination addresses */
 562         ether_addr_copy(dest, skb->data);
 563         ether_addr_copy(src, skb->data + ETH_ALEN);
 564
 565         memset(skb->cb, 0, sizeof(skb->cb));
 566         ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);
 567
 568         if (ieee->iw_mode == IW_MODE_MONITOR) {
 569                 txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
 570                 if (unlikely(!txb)) {
 571                         netdev_warn(ieee->dev,
 572                                     "Could not allocate TXB\n");
 573                         goto failed;
 574                 }
 575
 576                 txb->encrypted = 0;
 577                 txb->payload_size = cpu_to_le16(skb->len);
 578                 skb_put_data(txb->fragments[0], skb->data, skb->len);
 579
 580                 goto success;
 581         }
 582
 583         if (skb->len > 282) {
 584                 if (ether_type == ETH_P_IP) {
 585                         const struct iphdr *ip = (struct iphdr *)
 586                                 ((u8 *)skb->data + 14);
 587                         if (ip->protocol == IPPROTO_UDP) {
 588                                 struct udphdr *udp;
 589
 590                                 udp = (struct udphdr *)((u8 *)ip +
 591                                       (ip->ihl << 2));
 592                                 if (((((u8 *)udp)[1] == 68) &&
 593                                      (((u8 *)udp)[3] == 67)) ||
 594                                    ((((u8 *)udp)[1] == 67) &&
 595                                    (((u8 *)udp)[3] == 68))) {
 596                                         bdhcp = true;
 597                                         ieee->lps_delay_cnt = 200;
 598                                 }
 599                         }
 600                 } else if (ether_type == ETH_P_ARP) {
 601                         netdev_info(ieee->dev,
 602                                     "=================>DHCP Protocol start tx ARP pkt!!\n");
 603                         bdhcp = true;
 604                         ieee->lps_delay_cnt =
 605                                  ieee->current_network.tim.tim_count;
 606                 }
 607         }
 608
 609         skb->priority = rtllib_classify(skb);
 610         crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
 611         encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) && crypt && crypt->ops;
 612         if (!encrypt && ieee->ieee802_1x &&
 613             ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
 614                 stats->tx_dropped++;
 615                 goto success;
 616         }
 617         if (crypt && !encrypt && ether_type == ETH_P_PAE) {
 618                 struct eapol *eap = (struct eapol *)(skb->data +
 619                         sizeof(struct ethhdr) - SNAP_SIZE -
 620                         sizeof(u16));
 621                 netdev_dbg(ieee->dev,
 622                            "TX: IEEE 802.11 EAPOL frame: %s\n",
 623                            eap_get_type(eap->type));
 624         }
 625
 626         /* Advance the SKB to the start of the payload */
 627         skb_pull(skb, sizeof(struct ethhdr));
 628
 629         /* Determine total amount of storage required for TXB packets */
 630         bytes = skb->len + SNAP_SIZE + sizeof(u16);
 631
 632         if (encrypt)
 633                 fc = RTLLIB_FTYPE_DATA | IEEE80211_FCTL_PROTECTED;
 634         else
 635                 fc = RTLLIB_FTYPE_DATA;
 636
 637         if (qos_activated)
 638                 fc |= IEEE80211_STYPE_QOS_DATA;
 639         else
 640                 fc |= IEEE80211_STYPE_DATA;
 641
 642         if (ieee->iw_mode == IW_MODE_INFRA) {
 643                 fc |= IEEE80211_FCTL_TODS;
 644                 /* To DS: Addr1 = BSSID, Addr2 = SA,
 645                  * Addr3 = DA
 646                  */
 647                 ether_addr_copy(header.addr1,
 648                                 ieee->current_network.bssid);
 649                 ether_addr_copy(header.addr2, src);
 650                 ether_addr_copy(header.addr3, dest);
 651         }
 652
 653         is_multicast = is_multicast_ether_addr(header.addr1);
 654
 655         header.frame_control = cpu_to_le16(fc);
 656
 657         /* Determine fragmentation size based on destination (multicast
 658          * and broadcast are not fragmented)
 659          */
 660         if (is_multicast) {
 661                 frag_size = MAX_FRAG_THRESHOLD;
 662                 qos_ctl |= QOS_CTL_NOTCONTAIN_ACK;
 663         } else {
 664                 frag_size = ieee->fts;
 665                 qos_ctl = 0;
 666         }
 667
 668         if (qos_activated) {
 669                 hdr_len = RTLLIB_3ADDR_LEN + 2;
 670
 671                 /* in case we are a client verify acm is not set for this ac */
 672                 while (unlikely(ieee->wmm_acm & (0x01 << skb->priority))) {
 673                         netdev_info(ieee->dev, "skb->priority = %x\n",
 674                                     skb->priority);
 675                         if (wme_downgrade_ac(skb))
 676                                 break;
 677                         netdev_info(ieee->dev, "converted skb->priority = %x\n",
 678                                     skb->priority);
 679                 }
 680
 681                 qos_ctl |= skb->priority;
 682                 header.qos_ctrl = cpu_to_le16(qos_ctl & RTLLIB_QOS_TID);
 683
 684         } else {
 685                 hdr_len = RTLLIB_3ADDR_LEN;
 686         }
 687         /* Determine amount of payload per fragment.  Regardless of if
 688          * this stack is providing the full 802.11 header, one will
 689          * eventually be affixed to this fragment -- so we must account
 690          * for it when determining the amount of payload space.
 691          */
 692         bytes_per_frag = frag_size - hdr_len;
 693         if (ieee->config &
 694            (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 695                 bytes_per_frag -= RTLLIB_FCS_LEN;
 696
 697         /* Each fragment may need to have room for encrypting
 698          * pre/postfix
 699          */
 700         if (encrypt) {
 701                 bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
 702                         crypt->ops->extra_mpdu_postfix_len +
 703                         crypt->ops->extra_msdu_prefix_len +
 704                         crypt->ops->extra_msdu_postfix_len;
 705         }
 706         /* Number of fragments is the total bytes_per_frag /
 707          * payload_per_fragment
 708          */
 709         nr_frags = bytes / bytes_per_frag;
 710         bytes_last_frag = bytes % bytes_per_frag;
 711         if (bytes_last_frag)
 712                 nr_frags++;
 713         else
 714                 bytes_last_frag = bytes_per_frag;
 715
 716         /* When we allocate the TXB we allocate enough space for the
 717          * reserve and full fragment bytes (bytes_per_frag doesn't
 718          * include prefix, postfix, header, FCS, etc.)
 719          */
 720         txb = rtllib_alloc_txb(nr_frags, frag_size +
 721                                ieee->tx_headroom, GFP_ATOMIC);
 722         if (unlikely(!txb)) {
 723                 netdev_warn(ieee->dev, "Could not allocate TXB\n");
 724                 goto failed;
 725         }
 726         txb->encrypted = encrypt;
 727         txb->payload_size = cpu_to_le16(bytes);
 728
 729         if (qos_activated)
 730                 txb->queue_index = UP2AC(skb->priority);
 731         else
 732                 txb->queue_index = WME_AC_BE;
 733
 734         for (i = 0; i < nr_frags; i++) {
 735                 skb_frag = txb->fragments[i];
 736                 tcb_desc = (struct cb_desc *)(skb_frag->cb +
 737                             MAX_DEV_ADDR_SIZE);
 738                 if (qos_activated) {
 739                         skb_frag->priority = skb->priority;
 740                         tcb_desc->queue_index =  UP2AC(skb->priority);
 741                 } else {
 742                         skb_frag->priority = WME_AC_BE;
 743                         tcb_desc->queue_index = WME_AC_BE;
 744                 }
 745                 skb_reserve(skb_frag, ieee->tx_headroom);
 746
 747                 if (encrypt) {
 748                         if (ieee->hwsec_active)
 749                                 tcb_desc->hw_sec = 1;
 750                         else
 751                                 tcb_desc->hw_sec = 0;
 752                         skb_reserve(skb_frag,
 753                                     crypt->ops->extra_mpdu_prefix_len +
 754                                     crypt->ops->extra_msdu_prefix_len);
 755                 } else {
 756                         tcb_desc->hw_sec = 0;
 757                 }
 758                 frag_hdr = skb_put_data(skb_frag, &header, hdr_len);
 759
 760                 /* If this is not the last fragment, then add the
 761                  * MOREFRAGS bit to the frame control
 762                  */
 763                 if (i != nr_frags - 1) {
 764                         frag_hdr->frame_control = cpu_to_le16(fc |
 765                                                           IEEE80211_FCTL_MOREFRAGS);
 766                         bytes = bytes_per_frag;
 767
 768                 } else {
 769                         /* The last fragment has the remaining length */
 770                         bytes = bytes_last_frag;
 771                 }
 772                 if ((qos_activated) && (!is_multicast)) {
 773                         frag_hdr->seq_ctrl =
 774                                  cpu_to_le16(rtllib_query_seqnum(ieee, skb_frag,
 775                                                                  header.addr1));
 776                         frag_hdr->seq_ctrl =
 777                                  cpu_to_le16(le16_to_cpu(frag_hdr->seq_ctrl) << 4 | i);
 778                 } else {
 779                         frag_hdr->seq_ctrl =
 780                                  cpu_to_le16(ieee->seq_ctrl[0] << 4 | i);
 781                 }
 782                 /* Put a SNAP header on the first fragment */
 783                 if (i == 0) {
 784                         rtllib_put_snap(skb_put(skb_frag,
 785                                                 SNAP_SIZE +
 786                                                 sizeof(u16)), ether_type);
 787                         bytes -= SNAP_SIZE + sizeof(u16);
 788                 }
 789
 790                 skb_put_data(skb_frag, skb->data, bytes);
 791
 792                 /* Advance the SKB... */
 793                 skb_pull(skb, bytes);
 794
 795                 /* Encryption routine will move the header forward in
 796                  * order to insert the IV between the header and the
 797                  * payload
 798                  */
 799                 if (encrypt)
 800                         rtllib_encrypt_fragment(ieee, skb_frag,
 801                                                 hdr_len);
 802                 if (ieee->config &
 803                    (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 804                         skb_put(skb_frag, 4);
 805         }
 806
 807         if ((qos_activated) && (!is_multicast)) {
 808                 if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF)
 809                         ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0;
 810                 else
 811                         ieee->seq_ctrl[UP2AC(skb->priority) + 1]++;
 812         } else {
 813                 if (ieee->seq_ctrl[0] == 0xFFF)
 814                         ieee->seq_ctrl[0] = 0;
 815                 else
 816                         ieee->seq_ctrl[0]++;
 817         }
 818
 819  success:
 820         if (txb) {
 821                 tcb_desc = (struct cb_desc *)
 822                                 (txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE);
 823                 tcb_desc->tx_enable_fw_calc_dur = 1;
 824                 tcb_desc->priority = skb->priority;
 825
 826                 if (ether_type == ETH_P_PAE) {
 827                         if (ieee->ht_info->iot_action &
 828                             HT_IOT_ACT_WA_IOT_Broadcom) {
 829                                 tcb_desc->data_rate =
 830                                          mgnt_query_tx_rate_exclude_cck_rates(ieee);
 831                                 tcb_desc->tx_dis_rate_fallback = false;
 832                         } else {
 833                                 tcb_desc->data_rate = ieee->basic_rate;
 834                                 tcb_desc->tx_dis_rate_fallback = 1;
 835                         }
 836
 837                         tcb_desc->ratr_index = 7;
 838                         tcb_desc->tx_use_drv_assinged_rate = 1;
 839                 } else {
 840                         if (is_multicast_ether_addr(header.addr1))
 841                                 tcb_desc->multicast = 1;
 842                         if (is_broadcast_ether_addr(header.addr1))
 843                                 tcb_desc->broadcast = 1;
 844                         rtllib_txrate_selectmode(ieee, tcb_desc);
 845                         if (tcb_desc->multicast ||  tcb_desc->broadcast)
 846                                 tcb_desc->data_rate = ieee->basic_rate;
 847                         else
 848                                 tcb_desc->data_rate = rtllib_current_rate(ieee);
 849
 850                         if (bdhcp) {
 851                                 if (ieee->ht_info->iot_action &
 852                                     HT_IOT_ACT_WA_IOT_Broadcom) {
 853                                         tcb_desc->data_rate =
 854                                            mgnt_query_tx_rate_exclude_cck_rates(ieee);
 855                                         tcb_desc->tx_dis_rate_fallback = false;
 856                                 } else {
 857                                         tcb_desc->data_rate = MGN_1M;
 858                                         tcb_desc->tx_dis_rate_fallback = 1;
 859                                 }
 860
 861                                 tcb_desc->ratr_index = 7;
 862                                 tcb_desc->tx_use_drv_assinged_rate = 1;
 863                                 tcb_desc->bdhcp = 1;
 864                         }
 865
 866                         rtllib_query_short_preamble_mode(ieee, tcb_desc);
 867                         rtllib_tx_query_agg_cap(ieee, txb->fragments[0],
 868                                                 tcb_desc);
 869                         rtllib_query_ht_cap_short_gi(ieee, tcb_desc);
 870                         rtllib_query_bandwidth_mode(ieee, tcb_desc);
 871                         rtllib_query_protectionmode(ieee, tcb_desc,
 872                                                     txb->fragments[0]);
 873                 }
 874         }
 875         spin_unlock_irqrestore(&ieee->lock, flags);
 876         dev_kfree_skb_any(skb);
 877         if (txb) {
 878                 if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) {
 879                         dev->stats.tx_packets++;
 880                         dev->stats.tx_bytes += le16_to_cpu(txb->payload_size);
 881                         rtllib_softmac_xmit(txb, ieee);
 882                 } else {
 883                         rtllib_txb_free(txb);
 884                 }
 885         }
 886
 887         return 0;
 888
 889  failed:
 890         spin_unlock_irqrestore(&ieee->lock, flags);
 891         netif_stop_queue(dev);
 892         stats->tx_errors++;
 893         return 1;
 894 }
 895
 896 netdev_tx_t rtllib_xmit(struct sk_buff *skb, struct net_device *dev)
 897 {
 898         memset(skb->cb, 0, sizeof(skb->cb));
 899         return rtllib_xmit_inter(skb, dev) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
 900 }
 901 EXPORT_SYMBOL(rtllib_xmit);