drivers/staging/rtl8192e/rtllib

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
rtllib_put_snap
rtllib_encrypt_fragment
rtllib_txb_free
rtllib_alloc_txb
rtllib_classify
rtllib_tx_query_agg_cap
rtllib_qurey_ShortPreambleMode
rtllib_query_HTCapShortGI
rtllib_query_BandwidthMode
rtllib_query_protectionmode
rtllib_txrate_selectmode
rtllib_query_seqnum
wme_downgrade_ac
rtllib_current_rate
rtllib_xmit_inter
rtllib_xmit
   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 <ipw2100-admin@linux.intel.com>
   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 <andrea.merello@gmail.com>
  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 
 195 void rtllib_txb_free(struct rtllib_txb *txb)
 196 {
 197         if (unlikely(!txb))
 198                 return;
 199         kfree(txb);
 200 }
 201 
 202 static struct rtllib_txb *rtllib_alloc_txb(int nr_frags, int txb_size,
 203                                            gfp_t gfp_mask)
 204 {
 205         struct rtllib_txb *txb;
 206         int i;
 207 
 208         txb = kmalloc(sizeof(struct rtllib_txb) + (sizeof(u8 *) * nr_frags),
 209                       gfp_mask);
 210         if (!txb)
 211                 return NULL;
 212 
 213         memset(txb, 0, sizeof(struct rtllib_txb));
 214         txb->nr_frags = nr_frags;
 215         txb->frag_size = cpu_to_le16(txb_size);
 216 
 217         for (i = 0; i < nr_frags; i++) {
 218                 txb->fragments[i] = dev_alloc_skb(txb_size);
 219                 if (unlikely(!txb->fragments[i])) {
 220                         i--;
 221                         break;
 222                 }
 223                 memset(txb->fragments[i]->cb, 0, sizeof(txb->fragments[i]->cb));
 224         }
 225         if (unlikely(i != nr_frags)) {
 226                 while (i >= 0)
 227                         dev_kfree_skb_any(txb->fragments[i--]);
 228                 kfree(txb);
 229                 return NULL;
 230         }
 231         return txb;
 232 }
 233 
 234 static int rtllib_classify(struct sk_buff *skb, u8 bIsAmsdu)
 235 {
 236         struct ethhdr *eth;
 237         struct iphdr *ip;
 238 
 239         eth = (struct ethhdr *)skb->data;
 240         if (eth->h_proto != htons(ETH_P_IP))
 241                 return 0;
 242 
 243 #ifdef VERBOSE_DEBUG
 244         print_hex_dump_bytes("rtllib_classify(): ", DUMP_PREFIX_NONE, skb->data,
 245                              skb->len);
 246 #endif
 247         ip = ip_hdr(skb);
 248         switch (ip->tos & 0xfc) {
 249         case 0x20:
 250                 return 2;
 251         case 0x40:
 252                 return 1;
 253         case 0x60:
 254                 return 3;
 255         case 0x80:
 256                 return 4;
 257         case 0xa0:
 258                 return 5;
 259         case 0xc0:
 260                 return 6;
 261         case 0xe0:
 262                 return 7;
 263         default:
 264                 return 0;
 265         }
 266 }
 267 
 268 static void rtllib_tx_query_agg_cap(struct rtllib_device *ieee,
 269                                     struct sk_buff *skb,
 270                                     struct cb_desc *tcb_desc)
 271 {
 272         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 273         struct tx_ts_record *pTxTs = NULL;
 274         struct rtllib_hdr_1addr *hdr = (struct rtllib_hdr_1addr *)skb->data;
 275 
 276         if (rtllib_act_scanning(ieee, false))
 277                 return;
 278 
 279         if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 280                 return;
 281         if (!IsQoSDataFrame(skb->data))
 282                 return;
 283         if (is_multicast_ether_addr(hdr->addr1))
 284                 return;
 285 
 286         if (tcb_desc->bdhcp || ieee->CntAfterLink < 2)
 287                 return;
 288 
 289         if (pHTInfo->IOTAction & HT_IOT_ACT_TX_NO_AGGREGATION)
 290                 return;
 291 
 292         if (!ieee->GetNmodeSupportBySecCfg(ieee->dev))
 293                 return;
 294         if (pHTInfo->bCurrentAMPDUEnable) {
 295                 if (!GetTs(ieee, (struct ts_common_info **)(&pTxTs), hdr->addr1,
 296                     skb->priority, TX_DIR, true)) {
 297                         netdev_info(ieee->dev, "%s: can't get TS\n", __func__);
 298                         return;
 299                 }
 300                 if (pTxTs->TxAdmittedBARecord.bValid == false) {
 301                         if (ieee->wpa_ie_len && (ieee->pairwise_key_type ==
 302                             KEY_TYPE_NA)) {
 303                                 ;
 304                         } else if (tcb_desc->bdhcp == 1) {
 305                                 ;
 306                         } else if (!pTxTs->bDisable_AddBa) {
 307                                 TsStartAddBaProcess(ieee, pTxTs);
 308                         }
 309                         goto FORCED_AGG_SETTING;
 310                 } else if (pTxTs->bUsingBa == false) {
 311                         if (SN_LESS(pTxTs->TxAdmittedBARecord.BaStartSeqCtrl.field.SeqNum,
 312                            (pTxTs->TxCurSeq+1)%4096))
 313                                 pTxTs->bUsingBa = true;
 314                         else
 315                                 goto FORCED_AGG_SETTING;
 316                 }
 317                 if (ieee->iw_mode == IW_MODE_INFRA) {
 318                         tcb_desc->bAMPDUEnable = true;
 319                         tcb_desc->ampdu_factor = pHTInfo->CurrentAMPDUFactor;
 320                         tcb_desc->ampdu_density = pHTInfo->CurrentMPDUDensity;
 321                 }
 322         }
 323 FORCED_AGG_SETTING:
 324         switch (pHTInfo->ForcedAMPDUMode) {
 325         case HT_AGG_AUTO:
 326                 break;
 327 
 328         case HT_AGG_FORCE_ENABLE:
 329                 tcb_desc->bAMPDUEnable = true;
 330                 tcb_desc->ampdu_density = pHTInfo->ForcedMPDUDensity;
 331                 tcb_desc->ampdu_factor = pHTInfo->ForcedAMPDUFactor;
 332                 break;
 333 
 334         case HT_AGG_FORCE_DISABLE:
 335                 tcb_desc->bAMPDUEnable = false;
 336                 tcb_desc->ampdu_density = 0;
 337                 tcb_desc->ampdu_factor = 0;
 338                 break;
 339         }
 340 }
 341 
 342 static void rtllib_qurey_ShortPreambleMode(struct rtllib_device *ieee,
 343                                            struct cb_desc *tcb_desc)
 344 {
 345         tcb_desc->bUseShortPreamble = false;
 346         if (tcb_desc->data_rate == 2)
 347                 return;
 348         else if (ieee->current_network.capability &
 349                  WLAN_CAPABILITY_SHORT_PREAMBLE)
 350                 tcb_desc->bUseShortPreamble = true;
 351 }
 352 
 353 static void rtllib_query_HTCapShortGI(struct rtllib_device *ieee,
 354                                       struct cb_desc *tcb_desc)
 355 {
 356         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 357 
 358         tcb_desc->bUseShortGI           = false;
 359 
 360         if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 361                 return;
 362 
 363         if (pHTInfo->bForcedShortGI) {
 364                 tcb_desc->bUseShortGI = true;
 365                 return;
 366         }
 367 
 368         if ((pHTInfo->bCurBW40MHz == true) && pHTInfo->bCurShortGI40MHz)
 369                 tcb_desc->bUseShortGI = true;
 370         else if ((pHTInfo->bCurBW40MHz == false) && pHTInfo->bCurShortGI20MHz)
 371                 tcb_desc->bUseShortGI = true;
 372 }
 373 
 374 static void rtllib_query_BandwidthMode(struct rtllib_device *ieee,
 375                                        struct cb_desc *tcb_desc)
 376 {
 377         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 378 
 379         tcb_desc->bPacketBW = false;
 380 
 381         if (!pHTInfo->bCurrentHTSupport || !pHTInfo->bEnableHT)
 382                 return;
 383 
 384         if (tcb_desc->bMulticast || tcb_desc->bBroadcast)
 385                 return;
 386 
 387         if ((tcb_desc->data_rate & 0x80) == 0)
 388                 return;
 389         if (pHTInfo->bCurBW40MHz && pHTInfo->bCurTxBW40MHz &&
 390             !ieee->bandwidth_auto_switch.bforced_tx20Mhz)
 391                 tcb_desc->bPacketBW = true;
 392 }
 393 
 394 static void rtllib_query_protectionmode(struct rtllib_device *ieee,
 395                                         struct cb_desc *tcb_desc,
 396                                         struct sk_buff *skb)
 397 {
 398         struct rt_hi_throughput *pHTInfo;
 399 
 400         tcb_desc->bRTSSTBC                      = false;
 401         tcb_desc->bRTSUseShortGI                = false;
 402         tcb_desc->bCTSEnable                    = false;
 403         tcb_desc->RTSSC                         = 0;
 404         tcb_desc->bRTSBW                        = false;
 405 
 406         if (tcb_desc->bBroadcast || tcb_desc->bMulticast)
 407                 return;
 408 
 409         if (is_broadcast_ether_addr(skb->data+16))
 410                 return;
 411 
 412         if (ieee->mode < IEEE_N_24G) {
 413                 if (skb->len > ieee->rts) {
 414                         tcb_desc->bRTSEnable = true;
 415                         tcb_desc->rts_rate = MGN_24M;
 416                 } else if (ieee->current_network.buseprotection) {
 417                         tcb_desc->bRTSEnable = true;
 418                         tcb_desc->bCTSEnable = true;
 419                         tcb_desc->rts_rate = MGN_24M;
 420                 }
 421                 return;
 422         }
 423 
 424         pHTInfo = ieee->pHTInfo;
 425 
 426         while (true) {
 427                 if (pHTInfo->IOTAction & HT_IOT_ACT_FORCED_CTS2SELF) {
 428                         tcb_desc->bCTSEnable    = true;
 429                         tcb_desc->rts_rate  =   MGN_24M;
 430                         tcb_desc->bRTSEnable = true;
 431                         break;
 432                 } else if (pHTInfo->IOTAction & (HT_IOT_ACT_FORCED_RTS |
 433                            HT_IOT_ACT_PURE_N_MODE)) {
 434                         tcb_desc->bRTSEnable = true;
 435                         tcb_desc->rts_rate  =   MGN_24M;
 436                         break;
 437                 }
 438                 if (ieee->current_network.buseprotection) {
 439                         tcb_desc->bRTSEnable = true;
 440                         tcb_desc->bCTSEnable = true;
 441                         tcb_desc->rts_rate = MGN_24M;
 442                         break;
 443                 }
 444                 if (pHTInfo->bCurrentHTSupport  && pHTInfo->bEnableHT) {
 445                         u8 HTOpMode = pHTInfo->CurrentOpMode;
 446 
 447                         if ((pHTInfo->bCurBW40MHz && (HTOpMode == 2 ||
 448                              HTOpMode == 3)) ||
 449                              (!pHTInfo->bCurBW40MHz && HTOpMode == 3)) {
 450                                 tcb_desc->rts_rate = MGN_24M;
 451                                 tcb_desc->bRTSEnable = true;
 452                                 break;
 453                         }
 454                 }
 455                 if (skb->len > ieee->rts) {
 456                         tcb_desc->rts_rate = MGN_24M;
 457                         tcb_desc->bRTSEnable = true;
 458                         break;
 459                 }
 460                 if (tcb_desc->bAMPDUEnable) {
 461                         tcb_desc->rts_rate = MGN_24M;
 462                         tcb_desc->bRTSEnable = false;
 463                         break;
 464                 }
 465                 goto NO_PROTECTION;
 466         }
 467         if (ieee->current_network.capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
 468                 tcb_desc->bUseShortPreamble = true;
 469         if (ieee->iw_mode == IW_MODE_MASTER)
 470                 goto NO_PROTECTION;
 471         return;
 472 NO_PROTECTION:
 473         tcb_desc->bRTSEnable    = false;
 474         tcb_desc->bCTSEnable    = false;
 475         tcb_desc->rts_rate      = 0;
 476         tcb_desc->RTSSC         = 0;
 477         tcb_desc->bRTSBW        = false;
 478 }
 479 
 480 
 481 static void rtllib_txrate_selectmode(struct rtllib_device *ieee,
 482                                      struct cb_desc *tcb_desc)
 483 {
 484         if (ieee->bTxDisableRateFallBack)
 485                 tcb_desc->bTxDisableRateFallBack = true;
 486 
 487         if (ieee->bTxUseDriverAssingedRate)
 488                 tcb_desc->bTxUseDriverAssingedRate = true;
 489         if (!tcb_desc->bTxDisableRateFallBack ||
 490             !tcb_desc->bTxUseDriverAssingedRate) {
 491                 if (ieee->iw_mode == IW_MODE_INFRA ||
 492                     ieee->iw_mode == IW_MODE_ADHOC)
 493                         tcb_desc->RATRIndex = 0;
 494         }
 495 }
 496 
 497 static u16 rtllib_query_seqnum(struct rtllib_device *ieee, struct sk_buff *skb,
 498                                u8 *dst)
 499 {
 500         u16 seqnum = 0;
 501 
 502         if (is_multicast_ether_addr(dst))
 503                 return 0;
 504         if (IsQoSDataFrame(skb->data)) {
 505                 struct tx_ts_record *pTS = NULL;
 506 
 507                 if (!GetTs(ieee, (struct ts_common_info **)(&pTS), dst,
 508                     skb->priority, TX_DIR, true))
 509                         return 0;
 510                 seqnum = pTS->TxCurSeq;
 511                 pTS->TxCurSeq = (pTS->TxCurSeq+1)%4096;
 512                 return seqnum;
 513         }
 514         return 0;
 515 }
 516 
 517 static int wme_downgrade_ac(struct sk_buff *skb)
 518 {
 519         switch (skb->priority) {
 520         case 6:
 521         case 7:
 522                 skb->priority = 5; /* VO -> VI */
 523                 return 0;
 524         case 4:
 525         case 5:
 526                 skb->priority = 3; /* VI -> BE */
 527                 return 0;
 528         case 0:
 529         case 3:
 530                 skb->priority = 1; /* BE -> BK */
 531                 return 0;
 532         default:
 533                 return -1;
 534         }
 535 }
 536 
 537 static u8 rtllib_current_rate(struct rtllib_device *ieee)
 538 {
 539         if (ieee->mode & IEEE_MODE_MASK)
 540                 return ieee->rate;
 541 
 542         if (ieee->HTCurrentOperaRate)
 543                 return ieee->HTCurrentOperaRate;
 544         else
 545                 return ieee->rate & 0x7F;
 546 }
 547 
 548 static int rtllib_xmit_inter(struct sk_buff *skb, struct net_device *dev)
 549 {
 550         struct rtllib_device *ieee = (struct rtllib_device *)
 551                                      netdev_priv_rsl(dev);
 552         struct rtllib_txb *txb = NULL;
 553         struct rtllib_hdr_3addrqos *frag_hdr;
 554         int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
 555         unsigned long flags;
 556         struct net_device_stats *stats = &ieee->stats;
 557         int ether_type = 0, encrypt;
 558         int bytes, fc, qos_ctl = 0, hdr_len;
 559         struct sk_buff *skb_frag;
 560         struct rtllib_hdr_3addrqos header = { /* Ensure zero initialized */
 561                 .duration_id = 0,
 562                 .seq_ctl = 0,
 563                 .qos_ctl = 0
 564         };
 565         int qos_activated = ieee->current_network.qos_data.active;
 566         u8 dest[ETH_ALEN];
 567         u8 src[ETH_ALEN];
 568         struct lib80211_crypt_data *crypt = NULL;
 569         struct cb_desc *tcb_desc;
 570         u8 bIsMulticast = false;
 571         u8 IsAmsdu = false;
 572         bool    bdhcp = false;
 573 
 574         spin_lock_irqsave(&ieee->lock, flags);
 575 
 576         /* If there is no driver handler to take the TXB, don't bother
 577          * creating it...
 578          */
 579         if ((!ieee->hard_start_xmit && !(ieee->softmac_features &
 580            IEEE_SOFTMAC_TX_QUEUE)) ||
 581            ((!ieee->softmac_data_hard_start_xmit &&
 582            (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE)))) {
 583                 netdev_warn(ieee->dev, "No xmit handler.\n");
 584                 goto success;
 585         }
 586 
 587 
 588         if (likely(ieee->raw_tx == 0)) {
 589                 if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) {
 590                         netdev_warn(ieee->dev, "skb too small (%d).\n",
 591                                     skb->len);
 592                         goto success;
 593                 }
 594                 /* Save source and destination addresses */
 595                 ether_addr_copy(dest, skb->data);
 596                 ether_addr_copy(src, skb->data + ETH_ALEN);
 597 
 598                 memset(skb->cb, 0, sizeof(skb->cb));
 599                 ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto);
 600 
 601                 if (ieee->iw_mode == IW_MODE_MONITOR) {
 602                         txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
 603                         if (unlikely(!txb)) {
 604                                 netdev_warn(ieee->dev,
 605                                             "Could not allocate TXB\n");
 606                                 goto failed;
 607                         }
 608 
 609                         txb->encrypted = 0;
 610                         txb->payload_size = cpu_to_le16(skb->len);
 611                         skb_put_data(txb->fragments[0], skb->data, skb->len);
 612 
 613                         goto success;
 614                 }
 615 
 616                 if (skb->len > 282) {
 617                         if (ether_type == ETH_P_IP) {
 618                                 const struct iphdr *ip = (struct iphdr *)
 619                                         ((u8 *)skb->data+14);
 620                                 if (ip->protocol == IPPROTO_UDP) {
 621                                         struct udphdr *udp;
 622 
 623                                         udp = (struct udphdr *)((u8 *)ip +
 624                                               (ip->ihl << 2));
 625                                         if (((((u8 *)udp)[1] == 68) &&
 626                                            (((u8 *)udp)[3] == 67)) ||
 627                                            ((((u8 *)udp)[1] == 67) &&
 628                                            (((u8 *)udp)[3] == 68))) {
 629                                                 bdhcp = true;
 630                                                 ieee->LPSDelayCnt = 200;
 631                                         }
 632                                 }
 633                         } else if (ether_type == ETH_P_ARP) {
 634                                 netdev_info(ieee->dev,
 635                                             "=================>DHCP Protocol start tx ARP pkt!!\n");
 636                                 bdhcp = true;
 637                                 ieee->LPSDelayCnt =
 638                                          ieee->current_network.tim.tim_count;
 639                         }
 640                 }
 641 
 642                 skb->priority = rtllib_classify(skb, IsAmsdu);
 643                 crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx];
 644                 encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
 645                         ieee->host_encrypt && crypt && crypt->ops;
 646                 if (!encrypt && ieee->ieee802_1x &&
 647                     ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
 648                         stats->tx_dropped++;
 649                         goto success;
 650                 }
 651                 if (crypt && !encrypt && ether_type == ETH_P_PAE) {
 652                         struct eapol *eap = (struct eapol *)(skb->data +
 653                                 sizeof(struct ethhdr) - SNAP_SIZE -
 654                                 sizeof(u16));
 655                         netdev_dbg(ieee->dev,
 656                                    "TX: IEEE 802.11 EAPOL frame: %s\n",
 657                                    eap_get_type(eap->type));
 658                 }
 659 
 660                 /* Advance the SKB to the start of the payload */
 661                 skb_pull(skb, sizeof(struct ethhdr));
 662 
 663                 /* Determine total amount of storage required for TXB packets */
 664                 bytes = skb->len + SNAP_SIZE + sizeof(u16);
 665 
 666                 if (encrypt)
 667                         fc = RTLLIB_FTYPE_DATA | RTLLIB_FCTL_WEP;
 668                 else
 669                         fc = RTLLIB_FTYPE_DATA;
 670 
 671                 if (qos_activated)
 672                         fc |= RTLLIB_STYPE_QOS_DATA;
 673                 else
 674                         fc |= RTLLIB_STYPE_DATA;
 675 
 676                 if (ieee->iw_mode == IW_MODE_INFRA) {
 677                         fc |= RTLLIB_FCTL_TODS;
 678                         /* To DS: Addr1 = BSSID, Addr2 = SA,
 679                          * Addr3 = DA
 680                          */
 681                         ether_addr_copy(header.addr1,
 682                                         ieee->current_network.bssid);
 683                         ether_addr_copy(header.addr2, src);
 684                         if (IsAmsdu)
 685                                 ether_addr_copy(header.addr3,
 686                                                 ieee->current_network.bssid);
 687                         else
 688                                 ether_addr_copy(header.addr3, dest);
 689                 } else if (ieee->iw_mode == IW_MODE_ADHOC) {
 690                         /* not From/To DS: Addr1 = DA, Addr2 = SA,
 691                          * Addr3 = BSSID
 692                          */
 693                         ether_addr_copy(header.addr1, dest);
 694                         ether_addr_copy(header.addr2, src);
 695                         ether_addr_copy(header.addr3,
 696                                         ieee->current_network.bssid);
 697                 }
 698 
 699                 bIsMulticast = is_multicast_ether_addr(header.addr1);
 700 
 701                 header.frame_ctl = cpu_to_le16(fc);
 702 
 703                 /* Determine fragmentation size based on destination (multicast
 704                  * and broadcast are not fragmented)
 705                  */
 706                 if (bIsMulticast) {
 707                         frag_size = MAX_FRAG_THRESHOLD;
 708                         qos_ctl |= QOS_CTL_NOTCONTAIN_ACK;
 709                 } else {
 710                         frag_size = ieee->fts;
 711                         qos_ctl = 0;
 712                 }
 713 
 714                 if (qos_activated) {
 715                         hdr_len = RTLLIB_3ADDR_LEN + 2;
 716 
 717                         /* in case we are a client verify acm is not set for this ac */
 718                         while (unlikely(ieee->wmm_acm & (0x01 << skb->priority))) {
 719                                 netdev_info(ieee->dev, "skb->priority = %x\n",
 720                                                 skb->priority);
 721                                 if (wme_downgrade_ac(skb))
 722                                         break;
 723                                 netdev_info(ieee->dev, "converted skb->priority = %x\n",
 724                                            skb->priority);
 725                         }
 726 
 727                         qos_ctl |= skb->priority;
 728                         header.qos_ctl = cpu_to_le16(qos_ctl & RTLLIB_QOS_TID);
 729 
 730                 } else {
 731                         hdr_len = RTLLIB_3ADDR_LEN;
 732                 }
 733                 /* Determine amount of payload per fragment.  Regardless of if
 734                  * this stack is providing the full 802.11 header, one will
 735                  * eventually be affixed to this fragment -- so we must account
 736                  * for it when determining the amount of payload space.
 737                  */
 738                 bytes_per_frag = frag_size - hdr_len;
 739                 if (ieee->config &
 740                    (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 741                         bytes_per_frag -= RTLLIB_FCS_LEN;
 742 
 743                 /* Each fragment may need to have room for encrypting
 744                  * pre/postfix
 745                  */
 746                 if (encrypt) {
 747                         bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
 748                                 crypt->ops->extra_mpdu_postfix_len +
 749                                 crypt->ops->extra_msdu_prefix_len +
 750                                 crypt->ops->extra_msdu_postfix_len;
 751                 }
 752                 /* Number of fragments is the total bytes_per_frag /
 753                  * payload_per_fragment
 754                  */
 755                 nr_frags = bytes / bytes_per_frag;
 756                 bytes_last_frag = bytes % bytes_per_frag;
 757                 if (bytes_last_frag)
 758                         nr_frags++;
 759                 else
 760                         bytes_last_frag = bytes_per_frag;
 761 
 762                 /* When we allocate the TXB we allocate enough space for the
 763                  * reserve and full fragment bytes (bytes_per_frag doesn't
 764                  * include prefix, postfix, header, FCS, etc.)
 765                  */
 766                 txb = rtllib_alloc_txb(nr_frags, frag_size +
 767                                        ieee->tx_headroom, GFP_ATOMIC);
 768                 if (unlikely(!txb)) {
 769                         netdev_warn(ieee->dev, "Could not allocate TXB\n");
 770                         goto failed;
 771                 }
 772                 txb->encrypted = encrypt;
 773                 txb->payload_size = cpu_to_le16(bytes);
 774 
 775                 if (qos_activated)
 776                         txb->queue_index = UP2AC(skb->priority);
 777                 else
 778                         txb->queue_index = WME_AC_BE;
 779 
 780                 for (i = 0; i < nr_frags; i++) {
 781                         skb_frag = txb->fragments[i];
 782                         tcb_desc = (struct cb_desc *)(skb_frag->cb +
 783                                     MAX_DEV_ADDR_SIZE);
 784                         if (qos_activated) {
 785                                 skb_frag->priority = skb->priority;
 786                                 tcb_desc->queue_index =  UP2AC(skb->priority);
 787                         } else {
 788                                 skb_frag->priority = WME_AC_BE;
 789                                 tcb_desc->queue_index = WME_AC_BE;
 790                         }
 791                         skb_reserve(skb_frag, ieee->tx_headroom);
 792 
 793                         if (encrypt) {
 794                                 if (ieee->hwsec_active)
 795                                         tcb_desc->bHwSec = 1;
 796                                 else
 797                                         tcb_desc->bHwSec = 0;
 798                                 skb_reserve(skb_frag,
 799                                             crypt->ops->extra_mpdu_prefix_len +
 800                                             crypt->ops->extra_msdu_prefix_len);
 801                         } else {
 802                                 tcb_desc->bHwSec = 0;
 803                         }
 804                         frag_hdr = skb_put_data(skb_frag, &header, hdr_len);
 805 
 806                         /* If this is not the last fragment, then add the
 807                          * MOREFRAGS bit to the frame control
 808                          */
 809                         if (i != nr_frags - 1) {
 810                                 frag_hdr->frame_ctl = cpu_to_le16(
 811                                         fc | RTLLIB_FCTL_MOREFRAGS);
 812                                 bytes = bytes_per_frag;
 813 
 814                         } else {
 815                                 /* The last fragment has the remaining length */
 816                                 bytes = bytes_last_frag;
 817                         }
 818                         if ((qos_activated) && (!bIsMulticast)) {
 819                                 frag_hdr->seq_ctl =
 820                                          cpu_to_le16(rtllib_query_seqnum(ieee, skb_frag,
 821                                                              header.addr1));
 822                                 frag_hdr->seq_ctl =
 823                                          cpu_to_le16(le16_to_cpu(frag_hdr->seq_ctl)<<4 | i);
 824                         } else {
 825                                 frag_hdr->seq_ctl =
 826                                          cpu_to_le16(ieee->seq_ctrl[0]<<4 | i);
 827                         }
 828                         /* Put a SNAP header on the first fragment */
 829                         if (i == 0) {
 830                                 rtllib_put_snap(
 831                                         skb_put(skb_frag, SNAP_SIZE +
 832                                         sizeof(u16)), ether_type);
 833                                 bytes -= SNAP_SIZE + sizeof(u16);
 834                         }
 835 
 836                         skb_put_data(skb_frag, skb->data, bytes);
 837 
 838                         /* Advance the SKB... */
 839                         skb_pull(skb, bytes);
 840 
 841                         /* Encryption routine will move the header forward in
 842                          * order to insert the IV between the header and the
 843                          * payload
 844                          */
 845                         if (encrypt)
 846                                 rtllib_encrypt_fragment(ieee, skb_frag,
 847                                                         hdr_len);
 848                         if (ieee->config &
 849                            (CFG_RTLLIB_COMPUTE_FCS | CFG_RTLLIB_RESERVE_FCS))
 850                                 skb_put(skb_frag, 4);
 851                 }
 852 
 853                 if ((qos_activated) && (!bIsMulticast)) {
 854                         if (ieee->seq_ctrl[UP2AC(skb->priority) + 1] == 0xFFF)
 855                                 ieee->seq_ctrl[UP2AC(skb->priority) + 1] = 0;
 856                         else
 857                                 ieee->seq_ctrl[UP2AC(skb->priority) + 1]++;
 858                 } else {
 859                         if (ieee->seq_ctrl[0] == 0xFFF)
 860                                 ieee->seq_ctrl[0] = 0;
 861                         else
 862                                         ieee->seq_ctrl[0]++;
 863                 }
 864         } else {
 865                 if (unlikely(skb->len < sizeof(struct rtllib_hdr_3addr))) {
 866                         netdev_warn(ieee->dev, "skb too small (%d).\n",
 867                                     skb->len);
 868                         goto success;
 869                 }
 870 
 871                 txb = rtllib_alloc_txb(1, skb->len, GFP_ATOMIC);
 872                 if (!txb) {
 873                         netdev_warn(ieee->dev, "Could not allocate TXB\n");
 874                         goto failed;
 875                 }
 876 
 877                 txb->encrypted = 0;
 878                 txb->payload_size = cpu_to_le16(skb->len);
 879                 skb_put_data(txb->fragments[0], skb->data, skb->len);
 880         }
 881 
 882  success:
 883         if (txb) {
 884                 struct cb_desc *tcb_desc = (struct cb_desc *)
 885                                 (txb->fragments[0]->cb + MAX_DEV_ADDR_SIZE);
 886                 tcb_desc->bTxEnableFwCalcDur = 1;
 887                 tcb_desc->priority = skb->priority;
 888 
 889                 if (ether_type == ETH_P_PAE) {
 890                         if (ieee->pHTInfo->IOTAction &
 891                             HT_IOT_ACT_WA_IOT_Broadcom) {
 892                                 tcb_desc->data_rate =
 893                                          MgntQuery_TxRateExcludeCCKRates(ieee);
 894                                 tcb_desc->bTxDisableRateFallBack = false;
 895                         } else {
 896                                 tcb_desc->data_rate = ieee->basic_rate;
 897                                 tcb_desc->bTxDisableRateFallBack = 1;
 898                         }
 899 
 900 
 901                         tcb_desc->RATRIndex = 7;
 902                         tcb_desc->bTxUseDriverAssingedRate = 1;
 903                 } else {
 904                         if (is_multicast_ether_addr(header.addr1))
 905                                 tcb_desc->bMulticast = 1;
 906                         if (is_broadcast_ether_addr(header.addr1))
 907                                 tcb_desc->bBroadcast = 1;
 908                         rtllib_txrate_selectmode(ieee, tcb_desc);
 909                         if (tcb_desc->bMulticast ||  tcb_desc->bBroadcast)
 910                                 tcb_desc->data_rate = ieee->basic_rate;
 911                         else
 912                                 tcb_desc->data_rate = rtllib_current_rate(ieee);
 913 
 914                         if (bdhcp) {
 915                                 if (ieee->pHTInfo->IOTAction &
 916                                     HT_IOT_ACT_WA_IOT_Broadcom) {
 917                                         tcb_desc->data_rate =
 918                                            MgntQuery_TxRateExcludeCCKRates(ieee);
 919                                         tcb_desc->bTxDisableRateFallBack = false;
 920                                 } else {
 921                                         tcb_desc->data_rate = MGN_1M;
 922                                         tcb_desc->bTxDisableRateFallBack = 1;
 923                                 }
 924 
 925 
 926                                 tcb_desc->RATRIndex = 7;
 927                                 tcb_desc->bTxUseDriverAssingedRate = 1;
 928                                 tcb_desc->bdhcp = 1;
 929                         }
 930 
 931                         rtllib_qurey_ShortPreambleMode(ieee, tcb_desc);
 932                         rtllib_tx_query_agg_cap(ieee, txb->fragments[0],
 933                                                 tcb_desc);
 934                         rtllib_query_HTCapShortGI(ieee, tcb_desc);
 935                         rtllib_query_BandwidthMode(ieee, tcb_desc);
 936                         rtllib_query_protectionmode(ieee, tcb_desc,
 937                                                     txb->fragments[0]);
 938                 }
 939         }
 940         spin_unlock_irqrestore(&ieee->lock, flags);
 941         dev_kfree_skb_any(skb);
 942         if (txb) {
 943                 if (ieee->softmac_features & IEEE_SOFTMAC_TX_QUEUE) {
 944                         dev->stats.tx_packets++;
 945                         dev->stats.tx_bytes += le16_to_cpu(txb->payload_size);
 946                         rtllib_softmac_xmit(txb, ieee);
 947                 } else {
 948                         if ((*ieee->hard_start_xmit)(txb, dev) == 0) {
 949                                 stats->tx_packets++;
 950                                 stats->tx_bytes += le16_to_cpu(txb->payload_size);
 951                                 return 0;
 952                         }
 953                         rtllib_txb_free(txb);
 954                 }
 955         }
 956 
 957         return 0;
 958 
 959  failed:
 960         spin_unlock_irqrestore(&ieee->lock, flags);
 961         netif_stop_queue(dev);
 962         stats->tx_errors++;
 963         return 1;
 964 
 965 }
 966 
 967 int rtllib_xmit(struct sk_buff *skb, struct net_device *dev)
 968 {
 969         memset(skb->cb, 0, sizeof(skb->cb));
 970         return rtllib_xmit_inter(skb, dev);
 971 }
 972 EXPORT_SYMBOL(rtllib_xmit);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/rtl8192e/rtllib_tx.c

DEFINITIONS
