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 = _malloc(NR_RECVFRAME *
  76                                            sizeof(union recv_frame) +
  77                                            RXFRAME_ALIGN_SZ);
  78         if (precvpriv->pallocated_frame_buf == NULL)
  79                 return _FAIL;
  80         kmemleak_not_leak(precvpriv->pallocated_frame_buf);
  81         memset(precvpriv->pallocated_frame_buf, 0, NR_RECVFRAME *
  82                 sizeof(union recv_frame) + RXFRAME_ALIGN_SZ);
  83         precvpriv->precv_frame_buf = precvpriv->pallocated_frame_buf +
  84                                     RXFRAME_ALIGN_SZ -
  85                                     ((addr_t)(precvpriv->pallocated_frame_buf) &
  86                                     (RXFRAME_ALIGN_SZ-1));
  87         precvframe = (union recv_frame *)precvpriv->precv_frame_buf;
  88         for (i = 0; i < NR_RECVFRAME; i++) {
  89                 _init_listhead(&(precvframe->u.list));
  90                 list_insert_tail(&(precvframe->u.list),
  91                                  &(precvpriv->free_recv_queue.queue));
  92                 r8712_os_recv_resource_alloc(padapter, precvframe);
  93                 precvframe->u.hdr.adapter = padapter;
  94                 precvframe++;
  95         }
  96         precvpriv->rx_pending_cnt = 1;
  97         return r8712_init_recv_priv(precvpriv, padapter);
  98 }
  99
 100 void _r8712_free_recv_priv(struct recv_priv *precvpriv)
 101 {
 102         kfree(precvpriv->pallocated_frame_buf);
 103         r8712_free_recv_priv(precvpriv);
 104 }
 105
 106 union recv_frame *r8712_alloc_recvframe(struct  __queue *pfree_recv_queue)
 107 {
 108         unsigned long irqL;
 109         union recv_frame  *precvframe;
 110         struct list_head *plist, *phead;
 111         struct _adapter *padapter;
 112         struct recv_priv *precvpriv;
 113
 114         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 115         if (_queue_empty(pfree_recv_queue) == true)
 116                 precvframe = NULL;
 117         else {
 118                 phead = get_list_head(pfree_recv_queue);
 119                 plist = get_next(phead);
 120                 precvframe = LIST_CONTAINOR(plist, union recv_frame, u);
 121                 list_delete(&precvframe->u.hdr.list);
 122                 padapter = precvframe->u.hdr.adapter;
 123                 if (padapter != NULL) {
 124                         precvpriv = &padapter->recvpriv;
 125                         if (pfree_recv_queue == &precvpriv->free_recv_queue)
 126                                 precvpriv->free_recvframe_cnt--;
 127                 }
 128         }
 129         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 130         return precvframe;
 131 }
 132
 133 /*
 134 caller : defrag; recvframe_chk_defrag in recv_thread  (passive)
 135 pframequeue: defrag_queue : will be accessed in recv_thread  (passive)
 136
 137 using spin_lock to protect
 138
 139 */
 140
 141 void r8712_free_recvframe_queue(struct  __queue *pframequeue,
 142                                 struct  __queue *pfree_recv_queue)
 143 {
 144         union   recv_frame *precvframe;
 145         struct list_head *plist, *phead;
 146
 147         spin_lock(&pframequeue->lock);
 148         phead = get_list_head(pframequeue);
 149         plist = get_next(phead);
 150         while (end_of_queue_search(phead, plist) == false) {
 151                 precvframe = LIST_CONTAINOR(plist, union recv_frame, u);
 152                 plist = get_next(plist);
 153                 r8712_free_recvframe(precvframe, pfree_recv_queue);
 154         }
 155         spin_unlock(&pframequeue->lock);
 156 }
 157
 158 sint r8712_recvframe_chkmic(struct _adapter *adapter,
 159                             union recv_frame *precvframe)
 160 {
 161         sint i, res = _SUCCESS;
 162         u32     datalen;
 163         u8 miccode[8];
 164         u8 bmic_err = false;
 165         u8 *pframe, *payload, *pframemic;
 166         u8   *mickey, idx, *iv;
 167         struct  sta_info *stainfo;
 168         struct  rx_pkt_attrib *prxattrib = &precvframe->u.hdr.attrib;
 169         struct  security_priv *psecuritypriv = &adapter->securitypriv;
 170
 171         stainfo = r8712_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);
 172         if (prxattrib->encrypt == _TKIP_) {
 173                 /* calculate mic code */
 174                 if (stainfo != NULL) {
 175                         if (IS_MCAST(prxattrib->ra)) {
 176                                 iv = precvframe->u.hdr.rx_data +
 177                                      prxattrib->hdrlen;
 178                                 idx = iv[3];
 179                                 mickey = &psecuritypriv->XGrprxmickey[(((idx >>
 180                                          6) & 0x3)) - 1].skey[0];
 181                                 if (psecuritypriv->binstallGrpkey == false)
 182                                         return _FAIL;
 183                         } else
 184                                 mickey = &stainfo->tkiprxmickey.skey[0];
 185                         /*icv_len included the mic code*/
 186                         datalen = precvframe->u.hdr.len - prxattrib->hdrlen -
 187                                   prxattrib->iv_len - prxattrib->icv_len - 8;
 188                         pframe = precvframe->u.hdr.rx_data;
 189                         payload = pframe + prxattrib->hdrlen +
 190                                   prxattrib->iv_len;
 191                         seccalctkipmic(mickey, pframe, payload, datalen,
 192                                        &miccode[0],
 193                                        (unsigned char)prxattrib->priority);
 194                         pframemic = payload + datalen;
 195                         bmic_err = false;
 196                         for (i = 0; i < 8; i++) {
 197                                 if (miccode[i] != *(pframemic + i))
 198                                         bmic_err = true;
 199                         }
 200                         if (bmic_err == true) {
 201                                 if (prxattrib->bdecrypted == true)
 202                                         r8712_handle_tkip_mic_err(adapter,
 203                                                 (u8)IS_MCAST(prxattrib->ra));
 204                                 res = _FAIL;
 205                         } else {
 206                                 /* mic checked ok */
 207                                 if ((psecuritypriv->bcheck_grpkey ==
 208                                      false) && (IS_MCAST(prxattrib->ra) ==
 209                                      true))
 210                                         psecuritypriv->bcheck_grpkey = true;
 211                         }
 212                         recvframe_pull_tail(precvframe, 8);
 213                 }
 214         }
 215         return res;
 216 }
 217
 218 /* decrypt and set the ivlen,icvlen of the recv_frame */
 219 union recv_frame *r8712_decryptor(struct _adapter *padapter,
 220                             union recv_frame *precv_frame)
 221 {
 222         struct rx_pkt_attrib *prxattrib = &precv_frame->u.hdr.attrib;
 223         struct security_priv *psecuritypriv = &padapter->securitypriv;
 224         union recv_frame *return_packet = precv_frame;
 225
 226         if ((prxattrib->encrypt > 0) && ((prxattrib->bdecrypted == 0) ||
 227            (psecuritypriv->sw_decrypt == true))) {
 228                 psecuritypriv->hw_decrypted = false;
 229                 switch (prxattrib->encrypt) {
 230                 case _WEP40_:
 231                 case _WEP104_:
 232                         r8712_wep_decrypt(padapter, (u8 *)precv_frame);
 233                         break;
 234                 case _TKIP_:
 235                         r8712_tkip_decrypt(padapter, (u8 *)precv_frame);
 236                         break;
 237                 case _AES_:
 238                         r8712_aes_decrypt(padapter, (u8 *)precv_frame);
 239                         break;
 240                 default:
 241                                 break;
 242                 }
 243         } else if (prxattrib->bdecrypted == 1)
 244                 psecuritypriv->hw_decrypted = true;
 245         return return_packet;
 246 }
 247 /*###set the security information in the recv_frame */
 248 union recv_frame *r8712_portctrl(struct _adapter *adapter,
 249                                  union recv_frame *precv_frame)
 250 {
 251         u8 *psta_addr, *ptr;
 252         uint auth_alg;
 253         struct recv_frame_hdr *pfhdr;
 254         struct sta_info *psta;
 255         struct  sta_priv *pstapriv;
 256         union recv_frame *prtnframe;
 257         u16 ether_type = 0;
 258
 259         pstapriv = &adapter->stapriv;
 260         ptr = get_recvframe_data(precv_frame);
 261         pfhdr = &precv_frame->u.hdr;
 262         psta_addr = pfhdr->attrib.ta;
 263         psta = r8712_get_stainfo(pstapriv, psta_addr);
 264         auth_alg = adapter->securitypriv.AuthAlgrthm;
 265         if (auth_alg == 2) {
 266                 if ((psta != NULL) && (psta->ieee8021x_blocked)) {
 267                         /* blocked
 268                          * only accept EAPOL frame */
 269                         prtnframe = precv_frame;
 270                         /*get ether_type */
 271                         ptr = ptr + pfhdr->attrib.hdrlen +
 272                               pfhdr->attrib.iv_len + LLC_HEADER_SIZE;
 273                         memcpy(&ether_type, ptr, 2);
 274                         ether_type = ntohs((unsigned short)ether_type);
 275                         if (ether_type == 0x888e)
 276                                 prtnframe = precv_frame;
 277                         else {
 278                                 /*free this frame*/
 279                                 r8712_free_recvframe(precv_frame,
 280                                          &adapter->recvpriv.free_recv_queue);
 281                                 prtnframe = NULL;
 282                         }
 283                 } else {
 284                         /* allowed
 285                          * check decryption status, and decrypt the
 286                          * frame if needed */
 287                         prtnframe = precv_frame;
 288                         /* check is the EAPOL frame or not (Rekey) */
 289                         if (ether_type == 0x888e) {
 290                                 /* check Rekey */
 291                                 prtnframe = precv_frame;
 292                         }
 293                 }
 294         } else
 295                 prtnframe = precv_frame;
 296         return prtnframe;
 297 }
 298
 299 static sint recv_decache(union recv_frame *precv_frame, u8 bretry,
 300                   struct stainfo_rxcache *prxcache)
 301 {
 302         sint tid = precv_frame->u.hdr.attrib.priority;
 303         u16 seq_ctrl = ((precv_frame->u.hdr.attrib.seq_num&0xffff) << 4) |
 304                         (precv_frame->u.hdr.attrib.frag_num & 0xf);
 305
 306         if (tid > 15)
 307                 return _FAIL;
 308         if (seq_ctrl == prxcache->tid_rxseq[tid])
 309                 return _FAIL;
 310         prxcache->tid_rxseq[tid] = seq_ctrl;
 311         return _SUCCESS;
 312 }
 313
 314 static sint sta2sta_data_frame(struct _adapter *adapter,
 315                                union recv_frame *precv_frame,
 316                                struct sta_info **psta)
 317 {
 318         u8 *ptr = precv_frame->u.hdr.rx_data;
 319         sint ret = _SUCCESS;
 320         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 321         struct  sta_priv *pstapriv = &adapter->stapriv;
 322         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 323         u8 *mybssid  = get_bssid(pmlmepriv);
 324         u8 *myhwaddr = myid(&adapter->eeprompriv);
 325         u8 *sta_addr = NULL;
 326         sint bmcast = IS_MCAST(pattrib->dst);
 327
 328         if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true) ||
 329             (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE) == true)) {
 330                 /* filter packets that SA is myself or multicast or broadcast */
 331                 if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
 332                         return _FAIL;
 333                 if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
 334                         return _FAIL;
 335                 if (is_zero_ether_addr(pattrib->bssid) ||
 336                     is_zero_ether_addr(mybssid) ||
 337                     (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
 338                         return _FAIL;
 339                 sta_addr = pattrib->src;
 340         } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true) {
 341                 /* For Station mode, sa and bssid should always be BSSID,
 342                  * and DA is my mac-address */
 343                 if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN))
 344                         return _FAIL;
 345                sta_addr = pattrib->bssid;
 346          } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
 347                 if (bmcast) {
 348                         /* For AP mode, if DA == MCAST, then BSSID should
 349                          * be also MCAST */
 350                         if (!IS_MCAST(pattrib->bssid))
 351                                 return _FAIL;
 352                 } else { /* not mc-frame */
 353                         /* For AP mode, if DA is non-MCAST, then it must be
 354                          *  BSSID, and bssid == BSSID */
 355                         if (memcmp(pattrib->bssid, pattrib->dst, ETH_ALEN))
 356                                 return _FAIL;
 357                         sta_addr = pattrib->src;
 358                 }
 359           } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 360                 memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
 361                 memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
 362                 memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
 363                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 364                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 365                 sta_addr = mybssid;
 366           } else
 367                 ret  = _FAIL;
 368         if (bmcast)
 369                 *psta = r8712_get_bcmc_stainfo(adapter);
 370         else
 371                 *psta = r8712_get_stainfo(pstapriv, sta_addr); /* get ap_info */
 372         if (*psta == NULL) {
 373                 if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)
 374                         adapter->mppriv.rx_pktloss++;
 375                 return _FAIL;
 376         }
 377         return ret;
 378 }
 379
 380 static sint ap2sta_data_frame(struct _adapter *adapter,
 381                               union recv_frame *precv_frame,
 382                               struct sta_info **psta)
 383 {
 384         u8 *ptr = precv_frame->u.hdr.rx_data;
 385         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 386         struct  sta_priv *pstapriv = &adapter->stapriv;
 387         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 388         u8 *mybssid  = get_bssid(pmlmepriv);
 389         u8 *myhwaddr = myid(&adapter->eeprompriv);
 390         sint bmcast = IS_MCAST(pattrib->dst);
 391
 392         if ((check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true)
 393              && (check_fwstate(pmlmepriv, _FW_LINKED) == true)) {
 394                 /* if NULL-frame, drop packet */
 395                 if ((GetFrameSubType(ptr)) == WIFI_DATA_NULL)
 396                         return _FAIL;
 397                 /* drop QoS-SubType Data, including QoS NULL,
 398                  * excluding QoS-Data */
 399                 if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) ==
 400                      WIFI_QOS_DATA_TYPE) {
 401                         if (GetFrameSubType(ptr) & (BIT(4) | BIT(5) | BIT(6)))
 402                                 return _FAIL;
 403                 }
 404
 405                 /* filter packets that SA is myself or multicast or broadcast */
 406                if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
 407                         return _FAIL;
 408
 409                 /* da should be for me */
 410                 if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
 411                         return _FAIL;
 412                 /* check BSSID */
 413                 if (is_zero_ether_addr(pattrib->bssid) ||
 414                      is_zero_ether_addr(mybssid) ||
 415                      (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
 416                         return _FAIL;
 417                 if (bmcast)
 418                         *psta = r8712_get_bcmc_stainfo(adapter);
 419                 else
 420                        *psta = r8712_get_stainfo(pstapriv, pattrib->bssid);
 421                 if (*psta == NULL)
 422                         return _FAIL;
 423         } else if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) &&
 424                    (check_fwstate(pmlmepriv, _FW_LINKED) == true)) {
 425                 memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
 426                 memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
 427                 memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
 428                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 429                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 430                 memcpy(pattrib->bssid,  mybssid, ETH_ALEN);
 431                 *psta = r8712_get_stainfo(pstapriv, pattrib->bssid);
 432                 if (*psta == NULL)
 433                         return _FAIL;
 434         } else
 435                 return _FAIL;
 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) == true) {
 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                 if (memcmp(pattrib->bssid, mybssid, ETH_ALEN))
 453                         return _FAIL;
 454                 *psta = r8712_get_stainfo(pstapriv, pattrib->src);
 455                 if (*psta == NULL)
 456                         return _FAIL;
 457         }
 458         return _SUCCESS;
 459 }
 460
 461 static sint validate_recv_ctrl_frame(struct _adapter *adapter,
 462                               union recv_frame *precv_frame)
 463 {
 464         return _FAIL;
 465 }
 466
 467 static sint validate_recv_mgnt_frame(struct _adapter *adapter,
 468                               union recv_frame *precv_frame)
 469 {
 470         return _FAIL;
 471 }
 472
 473
 474 static sint validate_recv_data_frame(struct _adapter *adapter,
 475                               union recv_frame *precv_frame)
 476 {
 477         int res;
 478         u8 bretry;
 479         u8 *psa, *pda, *pbssid;
 480         struct sta_info *psta = NULL;
 481         u8 *ptr = precv_frame->u.hdr.rx_data;
 482         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 483         struct security_priv *psecuritypriv = &adapter->securitypriv;
 484
 485         bretry = GetRetry(ptr);
 486         pda = get_da(ptr);
 487         psa = get_sa(ptr);
 488         pbssid = get_hdr_bssid(ptr);
 489         if (pbssid == NULL)
 490                 return _FAIL;
 491         memcpy(pattrib->dst, pda, ETH_ALEN);
 492         memcpy(pattrib->src, psa, ETH_ALEN);
 493         memcpy(pattrib->bssid, pbssid, ETH_ALEN);
 494         switch (pattrib->to_fr_ds) {
 495         case 0:
 496                 memcpy(pattrib->ra, pda, ETH_ALEN);
 497                 memcpy(pattrib->ta, psa, ETH_ALEN);
 498                 res = sta2sta_data_frame(adapter, precv_frame, &psta);
 499                 break;
 500         case 1:
 501                 memcpy(pattrib->ra, pda, ETH_ALEN);
 502                 memcpy(pattrib->ta, pbssid, ETH_ALEN);
 503                 res = ap2sta_data_frame(adapter, precv_frame, &psta);
 504                 break;
 505         case 2:
 506                 memcpy(pattrib->ra, pbssid, ETH_ALEN);
 507                 memcpy(pattrib->ta, psa, ETH_ALEN);
 508                 res = sta2ap_data_frame(adapter, precv_frame, &psta);
 509                 break;
 510         case 3:
 511                 memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
 512                 memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
 513                 return _FAIL;
 514         default:
 515                 return _FAIL;
 516         }
 517         if (res == _FAIL)
 518                 return _FAIL;
 519         if (psta == NULL)
 520                 return _FAIL;
 521         else
 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     eth_type, len;
 606         u8      bsnaphdr;
 607         u8      *psnap_type;
 608         struct ieee80211_snap_hdr *psnap;
 609
 610         sint ret = _SUCCESS;
 611         struct _adapter *adapter = precvframe->u.hdr.adapter;
 612         struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
 613
 614         u8 *ptr = get_recvframe_data(precvframe); /*point to frame_ctrl field*/
 615         struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.attrib;
 616
 617         if (pattrib->encrypt)
 618                 recvframe_pull_tail(precvframe, pattrib->icv_len);
 619         psnap = (struct ieee80211_snap_hdr *)(ptr + pattrib->hdrlen +
 620                  pattrib->iv_len);
 621         psnap_type = ptr + pattrib->hdrlen + pattrib->iv_len + SNAP_SIZE;
 622         /* convert hdr + possible LLC headers into Ethernet header */
 623         if ((!memcmp(psnap, (void *)rfc1042_header, SNAP_SIZE) &&
 624             (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_IPX, 2)) &&
 625             (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_APPLETALK_AARP, 2))) ||
 626              !memcmp(psnap, (void *)bridge_tunnel_header, SNAP_SIZE)) {
 627                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 628                  * replace EtherType */
 629                 bsnaphdr = true;
 630         } else {
 631                 /* Leave Ethernet header part of hdr and full payload */
 632                 bsnaphdr = false;
 633         }
 634         rmv_len = pattrib->hdrlen + pattrib->iv_len +
 635                   (bsnaphdr ? SNAP_SIZE : 0);
 636         len = precvframe->u.hdr.len - rmv_len;
 637         if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
 638                 ptr += rmv_len;
 639                 *ptr = 0x87;
 640                 *(ptr+1) = 0x12;
 641                 eth_type = 0x8712;
 642                 /* append rx status for mp test packets */
 643                 ptr = recvframe_pull(precvframe, (rmv_len -
 644                       sizeof(struct ethhdr) + 2) - 24);
 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
 651         memcpy(ptr, pattrib->dst, ETH_ALEN);
 652         memcpy(ptr+ETH_ALEN, pattrib->src, ETH_ALEN);
 653         if (!bsnaphdr) {
 654                 len = htons(len);
 655                 memcpy(ptr + 12, &len, 2);
 656         }
 657         return ret;
 658 }
 659
 660 s32 r8712_recv_entry(union recv_frame *precvframe)
 661 {
 662         struct _adapter *padapter;
 663         struct recv_priv *precvpriv;
 664         struct  mlme_priv *pmlmepriv;
 665         struct recv_stat *prxstat;
 666         struct dvobj_priv *pdev;
 667         u8 *phead, *pdata, *ptail, *pend;
 668
 669         struct  __queue *pfree_recv_queue, *ppending_recv_queue;
 670         s32 ret = _SUCCESS;
 671         struct intf_hdl *pintfhdl;
 672
 673         padapter = precvframe->u.hdr.adapter;
 674         pintfhdl = &padapter->pio_queue->intf;
 675         pmlmepriv = &padapter->mlmepriv;
 676         precvpriv = &(padapter->recvpriv);
 677         pdev = &padapter->dvobjpriv;
 678         pfree_recv_queue = &(precvpriv->free_recv_queue);
 679         ppending_recv_queue = &(precvpriv->recv_pending_queue);
 680         phead = precvframe->u.hdr.rx_head;
 681         pdata = precvframe->u.hdr.rx_data;
 682         ptail = precvframe->u.hdr.rx_tail;
 683         pend = precvframe->u.hdr.rx_end;
 684         prxstat = (struct recv_stat *)phead;
 685
 686         padapter->ledpriv.LedControlHandler(padapter, LED_CTL_RX);
 687
 688         ret = recv_func(padapter, precvframe);
 689         if (ret == _FAIL)
 690                 goto _recv_entry_drop;
 691         precvpriv->rx_pkts++;
 692         precvpriv->rx_bytes += (uint)(precvframe->u.hdr.rx_tail -
 693                                 precvframe->u.hdr.rx_data);
 694         return ret;
 695 _recv_entry_drop:
 696         precvpriv->rx_drop++;
 697         padapter->mppriv.rx_pktloss = precvpriv->rx_drop;
 698         return ret;
 699 }