drivers/staging/rtl8712/rtl871x_recv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /******************************************************************************
   3  * rtl871x_recv.c
   4  *
   5  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   6  * Linux device driver for RTL8192SU
   7  *
   8  * Modifications for inclusion into the Linux staging tree are
   9  * Copyright(c) 2010 Larry Finger. All rights reserved.
  10  *
  11  * Contact information:
  12  * WLAN FAE <wlanfae@realtek.com>
  13  * Larry Finger <Larry.Finger@lwfinger.net>
  14  *
  15  ******************************************************************************/
  16
  17 #define _RTL871X_RECV_C_
  18
  19 #include <linux/ip.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/ieee80211.h>
  23 #include <net/cfg80211.h>
  24
  25 #include "osdep_service.h"
  26 #include "drv_types.h"
  27 #include "recv_osdep.h"
  28 #include "mlme_osdep.h"
  29 #include "ethernet.h"
  30 #include "usb_ops.h"
  31 #include "wifi.h"
  32
  33 static const u8 SNAP_ETH_TYPE_IPX[2] = {0x81, 0x37};
  34
  35 /* Datagram Delivery Protocol */
  36 static const u8 SNAP_ETH_TYPE_APPLETALK_AARP[2] = {0x80, 0xf3};
  37
  38 void _r8712_init_sta_recv_priv(struct sta_recv_priv *psta_recvpriv)
  39 {
  40         memset((u8 *)psta_recvpriv, 0, sizeof(struct sta_recv_priv));
  41         spin_lock_init(&psta_recvpriv->lock);
  42         _init_queue(&psta_recvpriv->defrag_q);
  43 }
  44
  45 int _r8712_init_recv_priv(struct recv_priv *precvpriv,
  46                           struct _adapter *padapter)
  47 {
  48         int ret;
  49         sint i;
  50         union recv_frame *precvframe;
  51
  52         memset((unsigned char *)precvpriv, 0, sizeof(struct  recv_priv));
  53         spin_lock_init(&precvpriv->lock);
  54         _init_queue(&precvpriv->free_recv_queue);
  55         _init_queue(&precvpriv->recv_pending_queue);
  56         precvpriv->adapter = padapter;
  57         precvpriv->free_recvframe_cnt = NR_RECVFRAME;
  58         precvpriv->pallocated_frame_buf = kzalloc(NR_RECVFRAME *
  59                                 sizeof(union recv_frame) + RXFRAME_ALIGN_SZ,
  60                                 GFP_ATOMIC);
  61         if (!precvpriv->pallocated_frame_buf)
  62                 return -ENOMEM;
  63         precvpriv->precv_frame_buf = precvpriv->pallocated_frame_buf +
  64                                     RXFRAME_ALIGN_SZ -
  65                                     ((addr_t)(precvpriv->pallocated_frame_buf) &
  66                                     (RXFRAME_ALIGN_SZ - 1));
  67         precvframe = (union recv_frame *)precvpriv->precv_frame_buf;
  68         for (i = 0; i < NR_RECVFRAME; i++) {
  69                 INIT_LIST_HEAD(&(precvframe->u.list));
  70                 list_add_tail(&(precvframe->u.list),
  71                               &(precvpriv->free_recv_queue.queue));
  72                 r8712_os_recv_resource_alloc(padapter, precvframe);
  73                 precvframe->u.hdr.adapter = padapter;
  74                 precvframe++;
  75         }
  76         precvpriv->rx_pending_cnt = 1;
  77         ret = r8712_init_recv_priv(precvpriv, padapter);
  78         if (ret)
  79                 kfree(precvpriv->pallocated_frame_buf);
  80
  81         return ret;
  82 }
  83
  84 void _r8712_free_recv_priv(struct recv_priv *precvpriv)
  85 {
  86         kfree(precvpriv->pallocated_frame_buf);
  87         r8712_free_recv_priv(precvpriv);
  88 }
  89
  90 union recv_frame *r8712_alloc_recvframe(struct __queue *pfree_recv_queue)
  91 {
  92         unsigned long irqL;
  93         union recv_frame  *precvframe;
  94         struct _adapter *padapter;
  95         struct recv_priv *precvpriv;
  96
  97         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
  98         precvframe = list_first_entry_or_null(&pfree_recv_queue->queue,
  99                                               union recv_frame, u.hdr.list);
 100         if (precvframe) {
 101                 list_del_init(&precvframe->u.hdr.list);
 102                 padapter = precvframe->u.hdr.adapter;
 103                 if (padapter) {
 104                         precvpriv = &padapter->recvpriv;
 105                         if (pfree_recv_queue == &precvpriv->free_recv_queue)
 106                                 precvpriv->free_recvframe_cnt--;
 107                 }
 108         }
 109         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 110         return precvframe;
 111 }
 112
 113 /*
 114  * caller : defrag; recvframe_chk_defrag in recv_thread  (passive)
 115  * pframequeue: defrag_queue : will be accessed in recv_thread  (passive)
 116  * using spin_lock to protect
 117  */
 118 void r8712_free_recvframe_queue(struct  __queue *pframequeue,
 119                                 struct  __queue *pfree_recv_queue)
 120 {
 121         union   recv_frame *precvframe;
 122         struct list_head *plist, *phead;
 123
 124         spin_lock(&pframequeue->lock);
 125         phead = &pframequeue->queue;
 126         plist = phead->next;
 127         while (!end_of_queue_search(phead, plist)) {
 128                 precvframe = container_of(plist, union recv_frame, u.list);
 129                 plist = plist->next;
 130                 r8712_free_recvframe(precvframe, pfree_recv_queue);
 131         }
 132         spin_unlock(&pframequeue->lock);
 133 }
 134
 135 sint r8712_recvframe_chkmic(struct _adapter *adapter,
 136                             union recv_frame *precvframe)
 137 {
 138         sint i, res = _SUCCESS;
 139         u32     datalen;
 140         u8 miccode[8];
 141         u8 bmic_err = false;
 142         u8 *pframe, *payload, *pframemic;
 143         u8   *mickey, idx, *iv;
 144         struct  sta_info *stainfo;
 145         struct  rx_pkt_attrib *prxattrib = &precvframe->u.hdr.attrib;
 146         struct  security_priv *psecuritypriv = &adapter->securitypriv;
 147
 148         stainfo = r8712_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);
 149         if (prxattrib->encrypt == _TKIP_) {
 150                 /* calculate mic code */
 151                 if (stainfo) {
 152                         if (is_multicast_ether_addr(prxattrib->ra)) {
 153                                 iv = precvframe->u.hdr.rx_data +
 154                                      prxattrib->hdrlen;
 155                                 idx = iv[3];
 156                                 mickey = &psecuritypriv->XGrprxmickey[(((idx >>
 157                                          6) & 0x3)) - 1].skey[0];
 158                                 if (!psecuritypriv->binstallGrpkey)
 159                                         return _FAIL;
 160                         } else {
 161                                 mickey = &stainfo->tkiprxmickey.skey[0];
 162                         }
 163                         /*icv_len included the mic code*/
 164                         datalen = precvframe->u.hdr.len - prxattrib->hdrlen -
 165                                   prxattrib->iv_len - prxattrib->icv_len - 8;
 166                         pframe = precvframe->u.hdr.rx_data;
 167                         payload = pframe + prxattrib->hdrlen +
 168                                   prxattrib->iv_len;
 169                         seccalctkipmic(mickey, pframe, payload, datalen,
 170                                        &miccode[0],
 171                                        (unsigned char)prxattrib->priority);
 172                         pframemic = payload + datalen;
 173                         bmic_err = false;
 174                         for (i = 0; i < 8; i++) {
 175                                 if (miccode[i] != *(pframemic + i))
 176                                         bmic_err = true;
 177                         }
 178                         if (bmic_err) {
 179                                 if (prxattrib->bdecrypted)
 180                                         r8712_handle_tkip_mic_err(adapter,
 181                                                                   (u8)is_multicast_ether_addr(prxattrib->ra));
 182                                 res = _FAIL;
 183                         } else {
 184                                 /* mic checked ok */
 185                                 if (!psecuritypriv->bcheck_grpkey &&
 186                                     is_multicast_ether_addr(prxattrib->ra))
 187                                         psecuritypriv->bcheck_grpkey = true;
 188                         }
 189                         recvframe_pull_tail(precvframe, 8);
 190                 }
 191         }
 192         return res;
 193 }
 194
 195 /* decrypt and set the ivlen,icvlen of the recv_frame */
 196 union recv_frame *r8712_decryptor(struct _adapter *padapter,
 197                                   union recv_frame *precv_frame)
 198 {
 199         struct rx_pkt_attrib *prxattrib = &precv_frame->u.hdr.attrib;
 200         struct security_priv *psecuritypriv = &padapter->securitypriv;
 201         union recv_frame *return_packet = precv_frame;
 202
 203         if ((prxattrib->encrypt > 0) && ((prxattrib->bdecrypted == 0) ||
 204                                          psecuritypriv->sw_decrypt)) {
 205                 psecuritypriv->hw_decrypted = false;
 206                 switch (prxattrib->encrypt) {
 207                 case _WEP40_:
 208                 case _WEP104_:
 209                         r8712_wep_decrypt(padapter, (u8 *)precv_frame);
 210                         break;
 211                 case _TKIP_:
 212                         r8712_tkip_decrypt(padapter, (u8 *)precv_frame);
 213                         break;
 214                 case _AES_:
 215                         r8712_aes_decrypt(padapter, (u8 *)precv_frame);
 216                         break;
 217                 default:
 218                                 break;
 219                 }
 220         } else if (prxattrib->bdecrypted == 1) {
 221                 psecuritypriv->hw_decrypted = true;
 222         }
 223         return return_packet;
 224 }
 225
 226 /*###set the security information in the recv_frame */
 227 union recv_frame *r8712_portctrl(struct _adapter *adapter,
 228                                  union recv_frame *precv_frame)
 229 {
 230         u8 *psta_addr, *ptr;
 231         uint auth_alg;
 232         struct recv_frame_hdr *pfhdr;
 233         struct sta_info *psta;
 234         struct  sta_priv *pstapriv;
 235         union recv_frame *prtnframe;
 236         u16 ether_type;
 237
 238         pstapriv = &adapter->stapriv;
 239         ptr = precv_frame->u.hdr.rx_data;
 240         pfhdr = &precv_frame->u.hdr;
 241         psta_addr = pfhdr->attrib.ta;
 242         psta = r8712_get_stainfo(pstapriv, psta_addr);
 243         auth_alg = adapter->securitypriv.AuthAlgrthm;
 244         if (auth_alg == 2) {
 245                 /* get ether_type */
 246                 ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE;
 247                 ether_type = get_unaligned_be16(ptr);
 248
 249                 if (psta && psta->ieee8021x_blocked) {
 250                         /* blocked
 251                          * only accept EAPOL frame
 252                          */
 253                         if (ether_type == 0x888e) {
 254                                 prtnframe = precv_frame;
 255                         } else {
 256                                 /*free this frame*/
 257                                 r8712_free_recvframe(precv_frame,
 258                                                      &adapter->recvpriv.free_recv_queue);
 259                                 prtnframe = NULL;
 260                         }
 261                 } else {
 262                         /* allowed
 263                          * check decryption status, and decrypt the
 264                          * frame if needed
 265                          */
 266                         prtnframe = precv_frame;
 267                         /* check is the EAPOL frame or not (Rekey) */
 268                         if (ether_type == 0x888e) {
 269                                 /* check Rekey */
 270                                 prtnframe = precv_frame;
 271                         }
 272                 }
 273         } else {
 274                 prtnframe = precv_frame;
 275         }
 276         return prtnframe;
 277 }
 278
 279 static sint recv_decache(union recv_frame *precv_frame, u8 bretry,
 280                          struct stainfo_rxcache *prxcache)
 281 {
 282         sint tid = precv_frame->u.hdr.attrib.priority;
 283         u16 seq_ctrl = ((precv_frame->u.hdr.attrib.seq_num & 0xffff) << 4) |
 284                         (precv_frame->u.hdr.attrib.frag_num & 0xf);
 285
 286         if (tid > 15)
 287                 return _FAIL;
 288         if (seq_ctrl == prxcache->tid_rxseq[tid])
 289                 return _FAIL;
 290         prxcache->tid_rxseq[tid] = seq_ctrl;
 291         return _SUCCESS;
 292 }
 293
 294 static sint sta2sta_data_frame(struct _adapter *adapter,
 295                                union recv_frame *precv_frame,
 296                                struct sta_info **psta)
 297 {
 298         u8 *ptr = precv_frame->u.hdr.rx_data;
 299         sint ret = _SUCCESS;
 300         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 301         struct  sta_priv *pstapriv = &adapter->stapriv;
 302         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 303         u8 *mybssid  = get_bssid(pmlmepriv);
 304         u8 *myhwaddr = myid(&adapter->eeprompriv);
 305         u8 *sta_addr = NULL;
 306         bool bmcast = is_multicast_ether_addr(pattrib->dst);
 307
 308         if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) ||
 309             check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)) {
 310                 /* filter packets that SA is myself or multicast or broadcast */
 311                 if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
 312                         return _FAIL;
 313                 if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
 314                         return _FAIL;
 315                 if (is_zero_ether_addr(pattrib->bssid) ||
 316                     is_zero_ether_addr(mybssid) ||
 317                     (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
 318                         return _FAIL;
 319                 sta_addr = pattrib->src;
 320         } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
 321                 /* For Station mode, sa and bssid should always be BSSID,
 322                  * and DA is my mac-address
 323                  */
 324                 if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN))
 325                         return _FAIL;
 326                 sta_addr = pattrib->bssid;
 327         } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 328                 if (bmcast) {
 329                         /* For AP mode, if DA == MCAST, then BSSID should
 330                          * be also MCAST
 331                          */
 332                         if (!is_multicast_ether_addr(pattrib->bssid))
 333                                 return _FAIL;
 334                 } else { /* not mc-frame */
 335                         /* For AP mode, if DA is non-MCAST, then it must be
 336                          * BSSID, and bssid == BSSID
 337                          */
 338                         if (memcmp(pattrib->bssid, pattrib->dst, ETH_ALEN))
 339                                 return _FAIL;
 340                         sta_addr = pattrib->src;
 341                 }
 342         } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 343                 memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
 344                 memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
 345                 memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
 346                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 347                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 348                 sta_addr = mybssid;
 349         } else {
 350                 ret  = _FAIL;
 351         }
 352         if (bmcast)
 353                 *psta = r8712_get_bcmc_stainfo(adapter);
 354         else
 355                 *psta = r8712_get_stainfo(pstapriv, sta_addr); /* get ap_info */
 356         if (!*psta) {
 357                 if (check_fwstate(pmlmepriv, WIFI_MP_STATE))
 358                         adapter->mppriv.rx_pktloss++;
 359                 return _FAIL;
 360         }
 361         return ret;
 362 }
 363
 364 static sint ap2sta_data_frame(struct _adapter *adapter,
 365                               union recv_frame *precv_frame,
 366                               struct sta_info **psta)
 367 {
 368         u8 *ptr = precv_frame->u.hdr.rx_data;
 369         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 370         struct  sta_priv *pstapriv = &adapter->stapriv;
 371         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 372         u8 *mybssid  = get_bssid(pmlmepriv);
 373         u8 *myhwaddr = myid(&adapter->eeprompriv);
 374         bool bmcast = is_multicast_ether_addr(pattrib->dst);
 375
 376         if (check_fwstate(pmlmepriv, WIFI_STATION_STATE) &&
 377             check_fwstate(pmlmepriv, _FW_LINKED)) {
 378                 /* if NULL-frame, drop packet */
 379                 if ((GetFrameSubType(ptr)) == (IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC))
 380                         return _FAIL;
 381                 /* drop QoS-SubType Data, including QoS NULL,
 382                  * excluding QoS-Data
 383                  */
 384                 if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) ==
 385                      WIFI_QOS_DATA_TYPE) {
 386                         if (GetFrameSubType(ptr) & (BIT(4) | BIT(5) | BIT(6)))
 387                                 return _FAIL;
 388                 }
 389
 390                 /* filter packets that SA is myself or multicast or broadcast */
 391                 if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
 392                         return _FAIL;
 393
 394                 /* da should be for me */
 395                 if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
 396                         return _FAIL;
 397                 /* check BSSID */
 398                 if (is_zero_ether_addr(pattrib->bssid) ||
 399                     is_zero_ether_addr(mybssid) ||
 400                      (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
 401                         return _FAIL;
 402                 if (bmcast)
 403                         *psta = r8712_get_bcmc_stainfo(adapter);
 404                 else
 405                         *psta = r8712_get_stainfo(pstapriv, pattrib->bssid);
 406                 if (!*psta)
 407                         return _FAIL;
 408         } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) &&
 409                    check_fwstate(pmlmepriv, _FW_LINKED)) {
 410                 memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
 411                 memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
 412                 memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
 413                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 414                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 415                 memcpy(pattrib->bssid,  mybssid, ETH_ALEN);
 416                 *psta = r8712_get_stainfo(pstapriv, pattrib->bssid);
 417                 if (!*psta)
 418                         return _FAIL;
 419         } else {
 420                 return _FAIL;
 421         }
 422         return _SUCCESS;
 423 }
 424
 425 static sint sta2ap_data_frame(struct _adapter *adapter,
 426                               union recv_frame *precv_frame,
 427                               struct sta_info **psta)
 428 {
 429         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 430         struct  sta_priv *pstapriv = &adapter->stapriv;
 431         struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
 432         unsigned char *mybssid  = get_bssid(pmlmepriv);
 433
 434         if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 435                 /* For AP mode, if DA is non-MCAST, then it must be BSSID,
 436                  * and bssid == BSSID
 437                  * For AP mode, RA=BSSID, TX=STA(SRC_ADDR), A3=DST_ADDR
 438                  */
 439                 if (memcmp(pattrib->bssid, mybssid, ETH_ALEN))
 440                         return _FAIL;
 441                 *psta = r8712_get_stainfo(pstapriv, pattrib->src);
 442                 if (!*psta)
 443                         return _FAIL;
 444         }
 445         return _SUCCESS;
 446 }
 447
 448 static sint validate_recv_ctrl_frame(struct _adapter *adapter,
 449                                      union recv_frame *precv_frame)
 450 {
 451         return _FAIL;
 452 }
 453
 454 static sint validate_recv_mgnt_frame(struct _adapter *adapter,
 455                                      union recv_frame *precv_frame)
 456 {
 457         return _FAIL;
 458 }
 459
 460 static sint validate_recv_data_frame(struct _adapter *adapter,
 461                                      union recv_frame *precv_frame)
 462 {
 463         int res;
 464         u8 bretry;
 465         u8 *psa, *pda, *pbssid;
 466         struct sta_info *psta = NULL;
 467         u8 *ptr = precv_frame->u.hdr.rx_data;
 468         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 469         struct security_priv *psecuritypriv = &adapter->securitypriv;
 470
 471         bretry = GetRetry(ptr);
 472         pda = ieee80211_get_DA((struct ieee80211_hdr *)ptr);
 473         psa = ieee80211_get_SA((struct ieee80211_hdr *)ptr);
 474         pbssid = get_hdr_bssid(ptr);
 475         if (!pbssid)
 476                 return _FAIL;
 477         memcpy(pattrib->dst, pda, ETH_ALEN);
 478         memcpy(pattrib->src, psa, ETH_ALEN);
 479         memcpy(pattrib->bssid, pbssid, ETH_ALEN);
 480         switch (pattrib->to_fr_ds) {
 481         case 0:
 482                 memcpy(pattrib->ra, pda, ETH_ALEN);
 483                 memcpy(pattrib->ta, psa, ETH_ALEN);
 484                 res = sta2sta_data_frame(adapter, precv_frame, &psta);
 485                 break;
 486         case 1:
 487                 memcpy(pattrib->ra, pda, ETH_ALEN);
 488                 memcpy(pattrib->ta, pbssid, ETH_ALEN);
 489                 res = ap2sta_data_frame(adapter, precv_frame, &psta);
 490                 break;
 491         case 2:
 492                 memcpy(pattrib->ra, pbssid, ETH_ALEN);
 493                 memcpy(pattrib->ta, psa, ETH_ALEN);
 494                 res = sta2ap_data_frame(adapter, precv_frame, &psta);
 495                 break;
 496         case 3:
 497                 memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
 498                 memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
 499                 return _FAIL;
 500         default:
 501                 return _FAIL;
 502         }
 503         if (res == _FAIL)
 504                 return _FAIL;
 505         if (!psta)
 506                 return _FAIL;
 507         precv_frame->u.hdr.psta = psta;
 508         pattrib->amsdu = 0;
 509         /* parsing QC field */
 510         if (pattrib->qos == 1) {
 511                 pattrib->priority = GetPriority((ptr + 24));
 512                 pattrib->ack_policy = GetAckpolicy((ptr + 24));
 513                 pattrib->amsdu = GetAMsdu((ptr + 24));
 514                 pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 32 : 26;
 515         } else {
 516                 pattrib->priority = 0;
 517                 pattrib->hdrlen = (pattrib->to_fr_ds == 3) ? 30 : 24;
 518         }
 519
 520         if (pattrib->order)/*HT-CTRL 11n*/
 521                 pattrib->hdrlen += 4;
 522         precv_frame->u.hdr.preorder_ctrl =
 523                          &psta->recvreorder_ctrl[pattrib->priority];
 524
 525         /* decache, drop duplicate recv packets */
 526         if (recv_decache(precv_frame, bretry, &psta->sta_recvpriv.rxcache) ==
 527             _FAIL)
 528                 return _FAIL;
 529
 530         if (pattrib->privacy) {
 531                 GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt,
 532                                is_multicast_ether_addr(pattrib->ra));
 533                 SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len,
 534                                pattrib->encrypt);
 535         } else {
 536                 pattrib->encrypt = 0;
 537                 pattrib->iv_len = pattrib->icv_len = 0;
 538         }
 539         return _SUCCESS;
 540 }
 541
 542 sint r8712_validate_recv_frame(struct _adapter *adapter,
 543                                union recv_frame *precv_frame)
 544 {
 545         /*shall check frame subtype, to / from ds, da, bssid */
 546         /*then call check if rx seq/frag. duplicated.*/
 547
 548         u8 type;
 549         u8 subtype;
 550         sint retval = _SUCCESS;
 551         struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
 552
 553         u8 *ptr = precv_frame->u.hdr.rx_data;
 554         u8  ver = (unsigned char)(*ptr) & 0x3;
 555
 556         /*add version chk*/
 557         if (ver != 0)
 558                 return _FAIL;
 559         type =  GetFrameType(ptr);
 560         subtype = GetFrameSubType(ptr); /*bit(7)~bit(2)*/
 561         pattrib->to_fr_ds = get_tofr_ds(ptr);
 562         pattrib->frag_num = GetFragNum(ptr);
 563         pattrib->seq_num = GetSequence(ptr);
 564         pattrib->pw_save = GetPwrMgt(ptr);
 565         pattrib->mfrag = GetMFrag(ptr);
 566         pattrib->mdata = GetMData(ptr);
 567         pattrib->privacy =  GetPrivacy(ptr);
 568         pattrib->order = GetOrder(ptr);
 569         switch (type) {
 570         case IEEE80211_FTYPE_MGMT:
 571                 retval = validate_recv_mgnt_frame(adapter, precv_frame);
 572                 break;
 573         case IEEE80211_FTYPE_CTL:
 574                 retval = validate_recv_ctrl_frame(adapter, precv_frame);
 575                 break;
 576         case IEEE80211_FTYPE_DATA:
 577                 pattrib->qos = (subtype & BIT(7)) ? 1 : 0;
 578                 retval = validate_recv_data_frame(adapter, precv_frame);
 579                 break;
 580         default:
 581                 return _FAIL;
 582         }
 583         return retval;
 584 }
 585
 586 int r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
 587 {
 588         /*remove the wlanhdr and add the eth_hdr*/
 589         sint    rmv_len;
 590         u16     len;
 591         u8      bsnaphdr;
 592         u8      *psnap_type;
 593         struct ieee80211_snap_hdr *psnap;
 594         struct _adapter *adapter = precvframe->u.hdr.adapter;
 595         struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
 596
 597         u8 *ptr = precvframe->u.hdr.rx_data; /*point to frame_ctrl field*/
 598         struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.attrib;
 599
 600         if (pattrib->encrypt)
 601                 recvframe_pull_tail(precvframe, pattrib->icv_len);
 602         psnap = (struct ieee80211_snap_hdr *)(ptr + pattrib->hdrlen +
 603                  pattrib->iv_len);
 604         psnap_type = ptr + pattrib->hdrlen + pattrib->iv_len + SNAP_SIZE;
 605         /* convert hdr + possible LLC headers into Ethernet header */
 606         if ((!memcmp(psnap, (void *)rfc1042_header, SNAP_SIZE) &&
 607              (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_IPX, 2)) &&
 608             (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_APPLETALK_AARP, 2))) ||
 609              !memcmp(psnap, (void *)bridge_tunnel_header, SNAP_SIZE)) {
 610                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
 611                  * replace EtherType
 612                  */
 613                 bsnaphdr = true;
 614         } else {
 615                 /* Leave Ethernet header part of hdr and full payload */
 616                 bsnaphdr = false;
 617         }
 618         rmv_len = pattrib->hdrlen + pattrib->iv_len +
 619                   (bsnaphdr ? SNAP_SIZE : 0);
 620         len = precvframe->u.hdr.len - rmv_len;
 621         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 622                 ptr += rmv_len;
 623                 *ptr = 0x87;
 624                 *(ptr + 1) = 0x12;
 625                 /* append rx status for mp test packets */
 626                 ptr = recvframe_pull(precvframe, (rmv_len -
 627                       sizeof(struct ethhdr) + 2) - 24);
 628                 if (!ptr)
 629                         return -ENOMEM;
 630                 memcpy(ptr, get_rxmem(precvframe), 24);
 631                 ptr += 24;
 632         } else {
 633                 ptr = recvframe_pull(precvframe, (rmv_len -
 634                       sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0)));
 635                 if (!ptr)
 636                         return -ENOMEM;
 637         }
 638
 639         memcpy(ptr, pattrib->dst, ETH_ALEN);
 640         memcpy(ptr + ETH_ALEN, pattrib->src, ETH_ALEN);
 641         if (!bsnaphdr) {
 642                 __be16 be_tmp = htons(len);
 643
 644                 memcpy(ptr + 12, &be_tmp, 2);
 645         }
 646         return 0;
 647 }
 648
 649 void r8712_recv_entry(union recv_frame *precvframe)
 650 {
 651         struct _adapter *padapter;
 652         struct recv_priv *precvpriv;
 653
 654         s32 ret = _SUCCESS;
 655
 656         padapter = precvframe->u.hdr.adapter;
 657         precvpriv = &(padapter->recvpriv);
 658
 659         padapter->ledpriv.LedControlHandler(padapter, LED_CTL_RX);
 660
 661         ret = recv_func(padapter, precvframe);
 662         if (ret == _FAIL)
 663                 goto _recv_entry_drop;
 664         precvpriv->rx_pkts++;
 665         precvpriv->rx_bytes += (uint)(precvframe->u.hdr.rx_tail -
 666                                 precvframe->u.hdr.rx_data);
 667         return;
 668 _recv_entry_drop:
 669         precvpriv->rx_drop++;
 670         padapter->mppriv.rx_pktloss = precvpriv->rx_drop;
 671 }