drivers/staging/rtl8712/rtl871x_recv.c

   1 /******************************************************************************
   2  * rtl871x_recv.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <[email protected]>
  25  * Larry Finger <[email protected]>
  26  *
  27  ******************************************************************************/
  28
  29 #define _RTL871X_RECV_C_
  30
  31 #include <linux/ip.h>
  32 #include <linux/slab.h>
  33 #include <linux/if_ether.h>
  34 #include <linux/kmemleak.h>
  35 #include <linux/etherdevice.h>
  36
  37 #include "osdep_service.h"
  38 #include "drv_types.h"
  39 #include "recv_osdep.h"
  40 #include "mlme_osdep.h"
  41 #include "ethernet.h"
  42 #include "usb_ops.h"
  43 #include "wifi.h"
  44
  45 static const u8 SNAP_ETH_TYPE_IPX[2] = {0x81, 0x37};
  46
  47 /* Datagram Delivery Protocol */
  48 static const u8 SNAP_ETH_TYPE_APPLETALK_AARP[2] = {0x80, 0xf3};
  49
  50 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  51 static const u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  52
  53 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  54 static const u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  55
  56 void _r8712_init_sta_recv_priv(struct sta_recv_priv *psta_recvpriv)
  57 {
  58         memset((u8 *)psta_recvpriv, 0, sizeof(struct sta_recv_priv));
  59         spin_lock_init(&psta_recvpriv->lock);
  60         _init_queue(&psta_recvpriv->defrag_q);
  61 }
  62
  63 sint _r8712_init_recv_priv(struct recv_priv *precvpriv,
  64                            struct _adapter *padapter)
  65 {
  66         sint i;
  67         union recv_frame *precvframe;
  68
  69          memset((unsigned char *)precvpriv, 0, sizeof(struct  recv_priv));
  70         spin_lock_init(&precvpriv->lock);
  71         _init_queue(&precvpriv->free_recv_queue);
  72         _init_queue(&precvpriv->recv_pending_queue);
  73         precvpriv->adapter = padapter;
  74         precvpriv->free_recvframe_cnt = NR_RECVFRAME;
  75         precvpriv->pallocated_frame_buf = kzalloc(NR_RECVFRAME *
  76                                 sizeof(union recv_frame) + RXFRAME_ALIGN_SZ,
  77                                 GFP_ATOMIC);
  78         if (precvpriv->pallocated_frame_buf == NULL)
  79                 return _FAIL;
  80         kmemleak_not_leak(precvpriv->pallocated_frame_buf);
  81         precvpriv->precv_frame_buf = precvpriv->pallocated_frame_buf +
  82                                     RXFRAME_ALIGN_SZ -
  83                                     ((addr_t)(precvpriv->pallocated_frame_buf) &
  84                                     (RXFRAME_ALIGN_SZ - 1));
  85         precvframe = (union recv_frame *)precvpriv->precv_frame_buf;
  86         for (i = 0; i < NR_RECVFRAME; i++) {
  87                 INIT_LIST_HEAD(&(precvframe->u.list));
  88                 list_add_tail(&(precvframe->u.list),
  89                                  &(precvpriv->free_recv_queue.queue));
  90                 r8712_os_recv_resource_alloc(padapter, precvframe);
  91                 precvframe->u.hdr.adapter = padapter;
  92                 precvframe++;
  93         }
  94         precvpriv->rx_pending_cnt = 1;
  95         return r8712_init_recv_priv(precvpriv, padapter);
  96 }
  97
  98 void _r8712_free_recv_priv(struct recv_priv *precvpriv)
  99 {
 100         kfree(precvpriv->pallocated_frame_buf);
 101         r8712_free_recv_priv(precvpriv);
 102 }
 103
 104 union recv_frame *r8712_alloc_recvframe(struct __queue *pfree_recv_queue)
 105 {
 106         unsigned long irqL;
 107         union recv_frame  *precvframe;
 108         struct _adapter *padapter;
 109         struct recv_priv *precvpriv;
 110
 111         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 112         precvframe = list_first_entry_or_null(&pfree_recv_queue->queue,
 113                                               union recv_frame, u.hdr.list);
 114         if (precvframe) {
 115                 list_del_init(&precvframe->u.hdr.list);
 116                 padapter = precvframe->u.hdr.adapter;
 117                 if (padapter != NULL) {
 118                         precvpriv = &padapter->recvpriv;
 119                         if (pfree_recv_queue == &precvpriv->free_recv_queue)
 120                                 precvpriv->free_recvframe_cnt--;
 121                 }
 122         }
 123         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 124         return precvframe;
 125 }
 126
 127 /*
 128  * caller : defrag; recvframe_chk_defrag in recv_thread  (passive)
 129  * pframequeue: defrag_queue : will be accessed in recv_thread  (passive)
 130  * using spin_lock to protect
 131  */
 132 void r8712_free_recvframe_queue(struct  __queue *pframequeue,
 133                                 struct  __queue *pfree_recv_queue)
 134 {
 135         union   recv_frame *precvframe;
 136         struct list_head *plist, *phead;
 137
 138         spin_lock(&pframequeue->lock);
 139         phead = &pframequeue->queue;
 140         plist = phead->next;
 141         while (!end_of_queue_search(phead, plist)) {
 142                 precvframe = container_of(plist, union recv_frame, u.list);
 143                 plist = plist->next;
 144                 r8712_free_recvframe(precvframe, pfree_recv_queue);
 145         }
 146         spin_unlock(&pframequeue->lock);
 147 }
 148
 149 sint r8712_recvframe_chkmic(struct _adapter *adapter,
 150                             union recv_frame *precvframe)
 151 {
 152         sint i, res = _SUCCESS;
 153         u32     datalen;
 154         u8 miccode[8];
 155         u8 bmic_err = false;
 156         u8 *pframe, *payload, *pframemic;
 157         u8   *mickey, idx, *iv;
 158         struct  sta_info *stainfo;
 159         struct  rx_pkt_attrib *prxattrib = &precvframe->u.hdr.attrib;
 160         struct  security_priv *psecuritypriv = &adapter->securitypriv;
 161
 162         stainfo = r8712_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);
 163         if (prxattrib->encrypt == _TKIP_) {
 164                 /* calculate mic code */
 165                 if (stainfo != NULL) {
 166                         if (IS_MCAST(prxattrib->ra)) {
 167                                 iv = precvframe->u.hdr.rx_data +
 168                                      prxattrib->hdrlen;
 169                                 idx = iv[3];
 170                                 mickey = &psecuritypriv->XGrprxmickey[(((idx >>
 171                                          6) & 0x3)) - 1].skey[0];
 172                                 if (!psecuritypriv->binstallGrpkey)
 173                                         return _FAIL;
 174                         } else {
 175                                 mickey = &stainfo->tkiprxmickey.skey[0];
 176                         }
 177                         /*icv_len included the mic code*/
 178                         datalen = precvframe->u.hdr.len - prxattrib->hdrlen -
 179                                   prxattrib->iv_len - prxattrib->icv_len - 8;
 180                         pframe = precvframe->u.hdr.rx_data;
 181                         payload = pframe + prxattrib->hdrlen +
 182                                   prxattrib->iv_len;
 183                         seccalctkipmic(mickey, pframe, payload, datalen,
 184                                        &miccode[0],
 185                                        (unsigned char)prxattrib->priority);
 186                         pframemic = payload + datalen;
 187                         bmic_err = false;
 188                         for (i = 0; i < 8; i++) {
 189                                 if (miccode[i] != *(pframemic + i))
 190                                         bmic_err = true;
 191                         }
 192                         if (bmic_err) {
 193                                 if (prxattrib->bdecrypted)
 194                                         r8712_handle_tkip_mic_err(adapter,
 195                                                 (u8)IS_MCAST(prxattrib->ra));
 196                                 res = _FAIL;
 197                         } else {
 198                                 /* mic checked ok */
 199                                 if (!psecuritypriv->bcheck_grpkey &&
 200                                     IS_MCAST(prxattrib->ra))
 201                                         psecuritypriv->bcheck_grpkey = true;
 202                         }
 203                         recvframe_pull_tail(precvframe, 8);
 204                 }
 205         }
 206         return res;
 207 }
 208
 209 /* decrypt and set the ivlen,icvlen of the recv_frame */
 210 union recv_frame *r8712_decryptor(struct _adapter *padapter,
 211                             union recv_frame *precv_frame)
 212 {
 213         struct rx_pkt_attrib *prxattrib = &precv_frame->u.hdr.attrib;
 214         struct security_priv *psecuritypriv = &padapter->securitypriv;
 215         union recv_frame *return_packet = precv_frame;
 216
 217         if ((prxattrib->encrypt > 0) && ((prxattrib->bdecrypted == 0) ||
 218             psecuritypriv->sw_decrypt)) {
 219                 psecuritypriv->hw_decrypted = false;
 220                 switch (prxattrib->encrypt) {
 221                 case _WEP40_:
 222                 case _WEP104_:
 223                         r8712_wep_decrypt(padapter, (u8 *)precv_frame);
 224                         break;
 225                 case _TKIP_:
 226                         r8712_tkip_decrypt(padapter, (u8 *)precv_frame);
 227                         break;
 228                 case _AES_:
 229                         r8712_aes_decrypt(padapter, (u8 *)precv_frame);
 230                         break;
 231                 default:
 232                                 break;
 233                 }
 234         } else if (prxattrib->bdecrypted == 1) {
 235                 psecuritypriv->hw_decrypted = true;
 236         }
 237         return return_packet;
 238 }
 239 /*###set the security information in the recv_frame */
 240 union recv_frame *r8712_portctrl(struct _adapter *adapter,
 241                                  union recv_frame *precv_frame)
 242 {
 243         u8 *psta_addr, *ptr;
 244         uint auth_alg;
 245         struct recv_frame_hdr *pfhdr;
 246         struct sta_info *psta;
 247         struct  sta_priv *pstapriv;
 248         union recv_frame *prtnframe;
 249         u16 ether_type;
 250
 251         pstapriv = &adapter->stapriv;
 252         ptr = get_recvframe_data(precv_frame);
 253         pfhdr = &precv_frame->u.hdr;
 254         psta_addr = pfhdr->attrib.ta;
 255         psta = r8712_get_stainfo(pstapriv, psta_addr);
 256         auth_alg = adapter->securitypriv.AuthAlgrthm;
 257         if (auth_alg == 2) {
 258                 /* get ether_type */
 259                 ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE;
 260                 memcpy(&ether_type, ptr, 2);
 261                 be16_to_cpus(&ether_type);
 262
 263                 if ((psta != NULL) && (psta->ieee8021x_blocked)) {
 264                         /* blocked
 265                          * only accept EAPOL frame
 266                          */
 267                         if (ether_type == 0x888e) {
 268                                 prtnframe = precv_frame;
 269                         } else {
 270                                 /*free this frame*/
 271                                 r8712_free_recvframe(precv_frame,
 272                                          &adapter->recvpriv.free_recv_queue);
 273                                 prtnframe = NULL;
 274                         }
 275                 } else {
 276                         /* allowed
 277                          * check decryption status, and decrypt the
 278                          * frame if needed
 279                          */
 280                         prtnframe = precv_frame;
 281                         /* check is the EAPOL frame or not (Rekey) */
 282                         if (ether_type == 0x888e) {
 283                                 /* check Rekey */
 284                                 prtnframe = precv_frame;
 285                         }
 286                 }
 287         } else {
 288                 prtnframe = precv_frame;
 289         }
 290         return prtnframe;
 291 }
 292
 293 static sint recv_decache(union recv_frame *precv_frame, u8 bretry,
 294                   struct stainfo_rxcache *prxcache)
 295 {
 296         sint tid = precv_frame->u.hdr.attrib.priority;
 297         u16 seq_ctrl = ((precv_frame->u.hdr.attrib.seq_num & 0xffff) << 4) |
 298                         (precv_frame->u.hdr.attrib.frag_num & 0xf);
 299
 300         if (tid > 15)
 301                 return _FAIL;
 302         if (seq_ctrl == prxcache->tid_rxseq[tid])
 303                 return _FAIL;
 304         prxcache->tid_rxseq[tid] = seq_ctrl;
 305         return _SUCCESS;
 306 }
 307
 308 static sint sta2sta_data_frame(struct _adapter *adapter,
 309                                union recv_frame *precv_frame,
 310                                struct sta_info **psta)
 311 {
 312         u8 *ptr = precv_frame->u.hdr.rx_data;
 313         sint ret = _SUCCESS;
 314         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 315         struct  sta_priv *pstapriv = &adapter->stapriv;
 316         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 317         u8 *mybssid  = get_bssid(pmlmepriv);
 318         u8 *myhwaddr = myid(&adapter->eeprompriv);
 319         u8 *sta_addr = NULL;
 320         sint bmcast = IS_MCAST(pattrib->dst);
 321
 322         if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) ||
 323             check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)) {
 324                 /* filter packets that SA is myself or multicast or broadcast */
 325                 if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
 326                         return _FAIL;
 327                 if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
 328                         return _FAIL;
 329                 if (is_zero_ether_addr(pattrib->bssid) ||
 330                     is_zero_ether_addr(mybssid) ||
 331                     (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
 332                         return _FAIL;
 333                 sta_addr = pattrib->src;
 334         } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
 335                 /* For Station mode, sa and bssid should always be BSSID,
 336                  * and DA is my mac-address
 337                  */
 338                 if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN))
 339                         return _FAIL;
 340                sta_addr = pattrib->bssid;
 341         } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 342                 if (bmcast) {
 343                         /* For AP mode, if DA == MCAST, then BSSID should
 344                          * be also MCAST
 345                          */
 346                         if (!IS_MCAST(pattrib->bssid))
 347                                 return _FAIL;
 348                 } else { /* not mc-frame */
 349                         /* For AP mode, if DA is non-MCAST, then it must be
 350                          * BSSID, and bssid == BSSID
 351                          */
 352                         if (memcmp(pattrib->bssid, pattrib->dst, ETH_ALEN))
 353                                 return _FAIL;
 354                         sta_addr = pattrib->src;
 355                 }
 356         } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 357                 memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
 358                 memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
 359                 memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
 360                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 361                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 362                 sta_addr = mybssid;
 363         } else {
 364                 ret  = _FAIL;
 365         }
 366         if (bmcast)
 367                 *psta = r8712_get_bcmc_stainfo(adapter);
 368         else
 369                 *psta = r8712_get_stainfo(pstapriv, sta_addr); /* get ap_info */
 370         if (*psta == NULL) {
 371                 if (check_fwstate(pmlmepriv, WIFI_MP_STATE))
 372                         adapter->mppriv.rx_pktloss++;
 373                 return _FAIL;
 374         }
 375         return ret;
 376 }
 377
 378 static sint ap2sta_data_frame(struct _adapter *adapter,
 379                               union recv_frame *precv_frame,
 380                               struct sta_info **psta)
 381 {
 382         u8 *ptr = precv_frame->u.hdr.rx_data;
 383         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 384         struct  sta_priv *pstapriv = &adapter->stapriv;
 385         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 386         u8 *mybssid  = get_bssid(pmlmepriv);
 387         u8 *myhwaddr = myid(&adapter->eeprompriv);
 388         sint bmcast = IS_MCAST(pattrib->dst);
 389
 390         if (check_fwstate(pmlmepriv, WIFI_STATION_STATE) &&
 391             check_fwstate(pmlmepriv, _FW_LINKED)) {
 392                 /* if NULL-frame, drop packet */
 393                 if ((GetFrameSubType(ptr)) == WIFI_DATA_NULL)
 394                         return _FAIL;
 395                 /* drop QoS-SubType Data, including QoS NULL,
 396                  * excluding QoS-Data
 397                  */
 398                 if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) ==
 399                      WIFI_QOS_DATA_TYPE) {
 400                         if (GetFrameSubType(ptr) & (BIT(4) | BIT(5) | BIT(6)))
 401                                 return _FAIL;
 402                 }
 403
 404                 /* filter packets that SA is myself or multicast or broadcast */
 405                 if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
 406                         return _FAIL;
 407
 408                 /* da should be for me */
 409                 if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
 410                         return _FAIL;
 411                 /* check BSSID */
 412                 if (is_zero_ether_addr(pattrib->bssid) ||
 413                      is_zero_ether_addr(mybssid) ||
 414                      (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
 415                         return _FAIL;
 416                 if (bmcast)
 417                         *psta = r8712_get_bcmc_stainfo(adapter);
 418                 else
 419                        *psta = r8712_get_stainfo(pstapriv, pattrib->bssid);
 420                 if (*psta == NULL)
 421                         return _FAIL;
 422         } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) &&
 423                    check_fwstate(pmlmepriv, _FW_LINKED)) {
 424                 memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
 425                 memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
 426                 memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
 427                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 428                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 429                 memcpy(pattrib->bssid,  mybssid, ETH_ALEN);
 430                 *psta = r8712_get_stainfo(pstapriv, pattrib->bssid);
 431                 if (*psta == NULL)
 432                         return _FAIL;
 433         } else {
 434                 return _FAIL;
 435         }
 436         return _SUCCESS;
 437 }
 438
 439 static sint sta2ap_data_frame(struct _adapter *adapter,
 440                               union recv_frame *precv_frame,
 441                               struct sta_info **psta)
 442 {
 443         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 444         struct  sta_priv *pstapriv = &adapter->stapriv;
 445         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 446         unsigned char *mybssid  = get_bssid(pmlmepriv);
 447
 448         if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 449                 /* For AP mode, if DA is non-MCAST, then it must be BSSID,
 450                  * and bssid == BSSID
 451                  * For AP mode, RA=BSSID, TX=STA(SRC_ADDR), A3=DST_ADDR
 452                  */
 453                 if (memcmp(pattrib->bssid, mybssid, ETH_ALEN))
 454                         return _FAIL;
 455                 *psta = r8712_get_stainfo(pstapriv, pattrib->src);
 456                 if (*psta == NULL)
 457                         return _FAIL;
 458         }
 459         return _SUCCESS;
 460 }
 461
 462 static sint validate_recv_ctrl_frame(struct _adapter *adapter,
 463                               union recv_frame *precv_frame)
 464 {
 465         return _FAIL;
 466 }
 467
 468 static sint validate_recv_mgnt_frame(struct _adapter *adapter,
 469                               union recv_frame *precv_frame)
 470 {
 471         return _FAIL;
 472 }
 473
 474
 475 static sint validate_recv_data_frame(struct _adapter *adapter,
 476                               union recv_frame *precv_frame)
 477 {
 478         int res;
 479         u8 bretry;
 480         u8 *psa, *pda, *pbssid;
 481         struct sta_info *psta = NULL;
 482         u8 *ptr = precv_frame->u.hdr.rx_data;
 483         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 484         struct security_priv *psecuritypriv = &adapter->securitypriv;
 485
 486         bretry = GetRetry(ptr);
 487         pda = get_da(ptr);
 488         psa = get_sa(ptr);
 489         pbssid = get_hdr_bssid(ptr);
 490         if (pbssid == NULL)
 491                 return _FAIL;
 492         memcpy(pattrib->dst, pda, ETH_ALEN);
 493         memcpy(pattrib->src, psa, ETH_ALEN);
 494         memcpy(pattrib->bssid, pbssid, ETH_ALEN);
 495         switch (pattrib->to_fr_ds) {
 496         case 0:
 497                 memcpy(pattrib->ra, pda, ETH_ALEN);
 498                 memcpy(pattrib->ta, psa, ETH_ALEN);
 499                 res = sta2sta_data_frame(adapter, precv_frame, &psta);
 500                 break;
 501         case 1:
 502                 memcpy(pattrib->ra, pda, ETH_ALEN);
 503                 memcpy(pattrib->ta, pbssid, ETH_ALEN);
 504                 res = ap2sta_data_frame(adapter, precv_frame, &psta);
 505                 break;
 506         case 2:
 507                 memcpy(pattrib->ra, pbssid, ETH_ALEN);
 508                 memcpy(pattrib->ta, psa, ETH_ALEN);
 509                 res = sta2ap_data_frame(adapter, precv_frame, &psta);
 510                 break;
 511         case 3:
 512                 memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
 513                 memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
 514                 return _FAIL;
 515         default:
 516                 return _FAIL;
 517         }
 518         if (res == _FAIL)
 519                 return _FAIL;
 520         if (psta == NULL)
 521                 return _FAIL;
 522         precv_frame->u.hdr.psta = psta;
 523         pattrib->amsdu = 0;
 524         /* parsing QC field */
 525         if (pattrib->qos == 1) {
 526                 pattrib->priority = GetPriority((ptr + 24));
 527                 pattrib->ack_policy = GetAckpolicy((ptr + 24));
 528                 pattrib->amsdu = GetAMsdu((ptr + 24));
 529                 pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 32 : 26;
 530         } else {
 531                 pattrib->priority = 0;
 532                 pattrib->hdrlen = (pattrib->to_fr_ds == 3) ? 30 : 24;
 533         }
 534
 535         if (pattrib->order)/*HT-CTRL 11n*/
 536                 pattrib->hdrlen += 4;
 537         precv_frame->u.hdr.preorder_ctrl =
 538                          &psta->recvreorder_ctrl[pattrib->priority];
 539
 540         /* decache, drop duplicate recv packets */
 541         if (recv_decache(precv_frame, bretry, &psta->sta_recvpriv.rxcache) ==
 542             _FAIL)
 543                 return _FAIL;
 544
 545         if (pattrib->privacy) {
 546                 GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt,
 547                                IS_MCAST(pattrib->ra));
 548                 SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len,
 549                                pattrib->encrypt);
 550         } else {
 551                 pattrib->encrypt = 0;
 552                 pattrib->iv_len = pattrib->icv_len = 0;
 553         }
 554         return _SUCCESS;
 555 }
 556
 557 sint r8712_validate_recv_frame(struct _adapter *adapter,
 558                                union recv_frame *precv_frame)
 559 {
 560         /*shall check frame subtype, to / from ds, da, bssid */
 561         /*then call check if rx seq/frag. duplicated.*/
 562
 563         u8 type;
 564         u8 subtype;
 565         sint retval = _SUCCESS;
 566         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 567
 568         u8 *ptr = precv_frame->u.hdr.rx_data;
 569         u8  ver = (unsigned char)(*ptr) & 0x3;
 570
 571         /*add version chk*/
 572         if (ver != 0)
 573                 return _FAIL;
 574         type =  GetFrameType(ptr);
 575         subtype = GetFrameSubType(ptr); /*bit(7)~bit(2)*/
 576         pattrib->to_fr_ds = get_tofr_ds(ptr);
 577         pattrib->frag_num = GetFragNum(ptr);
 578         pattrib->seq_num = GetSequence(ptr);
 579         pattrib->pw_save = GetPwrMgt(ptr);
 580         pattrib->mfrag = GetMFrag(ptr);
 581         pattrib->mdata = GetMData(ptr);
 582         pattrib->privacy =  GetPrivacy(ptr);
 583         pattrib->order = GetOrder(ptr);
 584         switch (type) {
 585         case WIFI_MGT_TYPE: /*mgnt*/
 586                 retval = validate_recv_mgnt_frame(adapter, precv_frame);
 587                 break;
 588         case WIFI_CTRL_TYPE:/*ctrl*/
 589                 retval = validate_recv_ctrl_frame(adapter, precv_frame);
 590                 break;
 591         case WIFI_DATA_TYPE: /*data*/
 592                 pattrib->qos = (subtype & BIT(7)) ? 1 : 0;
 593                 retval = validate_recv_data_frame(adapter, precv_frame);
 594                 break;
 595         default:
 596                 return _FAIL;
 597         }
 598         return retval;
 599 }
 600
 601 sint r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
 602 {
 603         /*remove the wlanhdr and add the eth_hdr*/
 604         sint    rmv_len;
 605         u16     len;
 606         u8      bsnaphdr;
 607         u8      *psnap_type;
 608         struct ieee80211_snap_hdr *psnap;
 609         struct _adapter *adapter = precvframe->u.hdr.adapter;
 610         struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
 611
 612         u8 *ptr = get_recvframe_data(precvframe); /*point to frame_ctrl field*/
 613         struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.attrib;
 614
 615         if (pattrib->encrypt)
 616                 recvframe_pull_tail(precvframe, pattrib->icv_len);
 617         psnap = (struct ieee80211_snap_hdr *)(ptr + pattrib->hdrlen +
 618                  pattrib->iv_len);
 619         psnap_type = ptr + pattrib->hdrlen + pattrib->iv_len + SNAP_SIZE;
 620         /* convert hdr + possible LLC headers into Ethernet header */
 621         if ((!memcmp(psnap, (void *)rfc1042_header, SNAP_SIZE) &&
 622             (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_IPX, 2)) &&
 623             (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_APPLETALK_AARP, 2))) ||
 624              !memcmp(psnap, (void *)bridge_tunnel_header, SNAP_SIZE)) {
 625                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 626                  * replace EtherType
 627                  */
 628                 bsnaphdr = true;
 629         } else {
 630                 /* Leave Ethernet header part of hdr and full payload */
 631                 bsnaphdr = false;
 632         }
 633         rmv_len = pattrib->hdrlen + pattrib->iv_len +
 634                   (bsnaphdr ? SNAP_SIZE : 0);
 635         len = precvframe->u.hdr.len - rmv_len;
 636         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 637                 ptr += rmv_len;
 638                 *ptr = 0x87;
 639                 *(ptr + 1) = 0x12;
 640                 /* append rx status for mp test packets */
 641                 ptr = recvframe_pull(precvframe, (rmv_len -
 642                       sizeof(struct ethhdr) + 2) - 24);
 643                 if (!ptr)
 644                         return _FAIL;
 645                 memcpy(ptr, get_rxmem(precvframe), 24);
 646                 ptr += 24;
 647         } else {
 648                 ptr = recvframe_pull(precvframe, (rmv_len -
 649                       sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0)));
 650                 if (!ptr)
 651                         return _FAIL;
 652         }
 653
 654         memcpy(ptr, pattrib->dst, ETH_ALEN);
 655         memcpy(ptr + ETH_ALEN, pattrib->src, ETH_ALEN);
 656         if (!bsnaphdr) {
 657                 __be16 be_tmp = htons(len);
 658
 659                 memcpy(ptr + 12, &be_tmp, 2);
 660         }
 661         return _SUCCESS;
 662 }
 663
 664 s32 r8712_recv_entry(union recv_frame *precvframe)
 665 {
 666         struct _adapter *padapter;
 667         struct recv_priv *precvpriv;
 668
 669         s32 ret = _SUCCESS;
 670
 671         padapter = precvframe->u.hdr.adapter;
 672         precvpriv = &(padapter->recvpriv);
 673
 674         padapter->ledpriv.LedControlHandler(padapter, LED_CTL_RX);
 675
 676         ret = recv_func(padapter, precvframe);
 677         if (ret == _FAIL)
 678                 goto _recv_entry_drop;
 679         precvpriv->rx_pkts++;
 680         precvpriv->rx_bytes += (uint)(precvframe->u.hdr.rx_tail -
 681                                 precvframe->u.hdr.rx_data);
 682         return ret;
 683 _recv_entry_drop:
 684         precvpriv->rx_drop++;
 685         padapter->mppriv.rx_pktloss = precvpriv->rx_drop;
 686         return ret;
 687 }