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 <wlanfae@realtek.com>
25 * Larry Finger <Larry.Finger@lwfinger.net>
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
_r8712_init_sta_recv_priv(struct sta_recv_priv * psta_recvpriv)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
_r8712_init_recv_priv(struct recv_priv * precvpriv,struct _adapter * padapter)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 = kmalloc(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 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_LIST_HEAD(&(precvframe->u.list));
90 list_add_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
_r8712_free_recv_priv(struct recv_priv * precvpriv)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
r8712_alloc_recvframe(struct __queue * pfree_recv_queue)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 (list_empty(&pfree_recv_queue->queue))
116 precvframe = NULL;
117 else {
118 phead = &pfree_recv_queue->queue;
119 plist = phead->next;
120 precvframe = LIST_CONTAINOR(plist, union recv_frame, u);
121 list_del_init(&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
r8712_free_recvframe_queue(struct __queue * pframequeue,struct __queue * pfree_recv_queue)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 = &pframequeue->queue;
149 plist = phead->next;
150 while (end_of_queue_search(phead, plist) == false) {
151 precvframe = LIST_CONTAINOR(plist, union recv_frame, u);
152 plist = plist->next;
153 r8712_free_recvframe(precvframe, pfree_recv_queue);
154 }
155 spin_unlock(&pframequeue->lock);
156 }
157
r8712_recvframe_chkmic(struct _adapter * adapter,union recv_frame * precvframe)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 */
r8712_decryptor(struct _adapter * padapter,union recv_frame * precv_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 */
r8712_portctrl(struct _adapter * adapter,union recv_frame * precv_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;
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 /* get ether_type */
267 ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE;
268 memcpy(ðer_type, ptr, 2);
269 ether_type = ntohs((unsigned short)ether_type);
270
271 if ((psta != NULL) && (psta->ieee8021x_blocked)) {
272 /* blocked
273 * only accept EAPOL frame */
274 if (ether_type == 0x888e)
275 prtnframe = precv_frame;
276 else {
277 /*free this frame*/
278 r8712_free_recvframe(precv_frame,
279 &adapter->recvpriv.free_recv_queue);
280 prtnframe = NULL;
281 }
282 } else {
283 /* allowed
284 * check decryption status, and decrypt the
285 * frame if needed */
286 prtnframe = precv_frame;
287 /* check is the EAPOL frame or not (Rekey) */
288 if (ether_type == 0x888e) {
289 /* check Rekey */
290 prtnframe = precv_frame;
291 }
292 }
293 } else
294 prtnframe = precv_frame;
295 return prtnframe;
296 }
297
recv_decache(union recv_frame * precv_frame,u8 bretry,struct stainfo_rxcache * prxcache)298 static sint recv_decache(union recv_frame *precv_frame, u8 bretry,
299 struct stainfo_rxcache *prxcache)
300 {
301 sint tid = precv_frame->u.hdr.attrib.priority;
302 u16 seq_ctrl = ((precv_frame->u.hdr.attrib.seq_num&0xffff) << 4) |
303 (precv_frame->u.hdr.attrib.frag_num & 0xf);
304
305 if (tid > 15)
306 return _FAIL;
307 if (seq_ctrl == prxcache->tid_rxseq[tid])
308 return _FAIL;
309 prxcache->tid_rxseq[tid] = seq_ctrl;
310 return _SUCCESS;
311 }
312
sta2sta_data_frame(struct _adapter * adapter,union recv_frame * precv_frame,struct sta_info ** psta)313 static sint sta2sta_data_frame(struct _adapter *adapter,
314 union recv_frame *precv_frame,
315 struct sta_info **psta)
316 {
317 u8 *ptr = precv_frame->u.hdr.rx_data;
318 sint ret = _SUCCESS;
319 struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
320 struct sta_priv *pstapriv = &adapter->stapriv;
321 struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
322 u8 *mybssid = get_bssid(pmlmepriv);
323 u8 *myhwaddr = myid(&adapter->eeprompriv);
324 u8 *sta_addr = NULL;
325 sint bmcast = IS_MCAST(pattrib->dst);
326
327 if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true) ||
328 (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE) == true)) {
329 /* filter packets that SA is myself or multicast or broadcast */
330 if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN))
331 return _FAIL;
332 if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
333 return _FAIL;
334 if (is_zero_ether_addr(pattrib->bssid) ||
335 is_zero_ether_addr(mybssid) ||
336 (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
337 return _FAIL;
338 sta_addr = pattrib->src;
339 } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true) {
340 /* For Station mode, sa and bssid should always be BSSID,
341 * and DA is my mac-address */
342 if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN))
343 return _FAIL;
344 sta_addr = pattrib->bssid;
345 } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
346 if (bmcast) {
347 /* For AP mode, if DA == MCAST, then BSSID should
348 * be also MCAST */
349 if (!IS_MCAST(pattrib->bssid))
350 return _FAIL;
351 } else { /* not mc-frame */
352 /* For AP mode, if DA is non-MCAST, then it must be
353 * BSSID, and bssid == BSSID */
354 if (memcmp(pattrib->bssid, pattrib->dst, ETH_ALEN))
355 return _FAIL;
356 sta_addr = pattrib->src;
357 }
358 } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
359 memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
360 memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
361 memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
362 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
363 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
364 sta_addr = mybssid;
365 } else
366 ret = _FAIL;
367 if (bmcast)
368 *psta = r8712_get_bcmc_stainfo(adapter);
369 else
370 *psta = r8712_get_stainfo(pstapriv, sta_addr); /* get ap_info */
371 if (*psta == NULL) {
372 if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)
373 adapter->mppriv.rx_pktloss++;
374 return _FAIL;
375 }
376 return ret;
377 }
378
ap2sta_data_frame(struct _adapter * adapter,union recv_frame * precv_frame,struct sta_info ** psta)379 static sint ap2sta_data_frame(struct _adapter *adapter,
380 union recv_frame *precv_frame,
381 struct sta_info **psta)
382 {
383 u8 *ptr = precv_frame->u.hdr.rx_data;
384 struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
385 struct sta_priv *pstapriv = &adapter->stapriv;
386 struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
387 u8 *mybssid = get_bssid(pmlmepriv);
388 u8 *myhwaddr = myid(&adapter->eeprompriv);
389 sint bmcast = IS_MCAST(pattrib->dst);
390
391 if ((check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true)
392 && (check_fwstate(pmlmepriv, _FW_LINKED) == true)) {
393 /* if NULL-frame, drop packet */
394 if ((GetFrameSubType(ptr)) == WIFI_DATA_NULL)
395 return _FAIL;
396 /* drop QoS-SubType Data, including QoS NULL,
397 * excluding QoS-Data */
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) == true) &&
423 (check_fwstate(pmlmepriv, _FW_LINKED) == true)) {
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 return _SUCCESS;
436 }
437
sta2ap_data_frame(struct _adapter * adapter,union recv_frame * precv_frame,struct sta_info ** psta)438 static sint sta2ap_data_frame(struct _adapter *adapter,
439 union recv_frame *precv_frame,
440 struct sta_info **psta)
441 {
442 struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
443 struct sta_priv *pstapriv = &adapter->stapriv;
444 struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
445 unsigned char *mybssid = get_bssid(pmlmepriv);
446
447 if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
448 /* For AP mode, if DA is non-MCAST, then it must be BSSID,
449 * and bssid == BSSID
450 * For AP mode, RA=BSSID, TX=STA(SRC_ADDR), A3=DST_ADDR */
451 if (memcmp(pattrib->bssid, mybssid, ETH_ALEN))
452 return _FAIL;
453 *psta = r8712_get_stainfo(pstapriv, pattrib->src);
454 if (*psta == NULL)
455 return _FAIL;
456 }
457 return _SUCCESS;
458 }
459
validate_recv_ctrl_frame(struct _adapter * adapter,union recv_frame * precv_frame)460 static sint validate_recv_ctrl_frame(struct _adapter *adapter,
461 union recv_frame *precv_frame)
462 {
463 return _FAIL;
464 }
465
validate_recv_mgnt_frame(struct _adapter * adapter,union recv_frame * precv_frame)466 static sint validate_recv_mgnt_frame(struct _adapter *adapter,
467 union recv_frame *precv_frame)
468 {
469 return _FAIL;
470 }
471
472
validate_recv_data_frame(struct _adapter * adapter,union recv_frame * precv_frame)473 static sint validate_recv_data_frame(struct _adapter *adapter,
474 union recv_frame *precv_frame)
475 {
476 int res;
477 u8 bretry;
478 u8 *psa, *pda, *pbssid;
479 struct sta_info *psta = NULL;
480 u8 *ptr = precv_frame->u.hdr.rx_data;
481 struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
482 struct security_priv *psecuritypriv = &adapter->securitypriv;
483
484 bretry = GetRetry(ptr);
485 pda = get_da(ptr);
486 psa = get_sa(ptr);
487 pbssid = get_hdr_bssid(ptr);
488 if (pbssid == NULL)
489 return _FAIL;
490 memcpy(pattrib->dst, pda, ETH_ALEN);
491 memcpy(pattrib->src, psa, ETH_ALEN);
492 memcpy(pattrib->bssid, pbssid, ETH_ALEN);
493 switch (pattrib->to_fr_ds) {
494 case 0:
495 memcpy(pattrib->ra, pda, ETH_ALEN);
496 memcpy(pattrib->ta, psa, ETH_ALEN);
497 res = sta2sta_data_frame(adapter, precv_frame, &psta);
498 break;
499 case 1:
500 memcpy(pattrib->ra, pda, ETH_ALEN);
501 memcpy(pattrib->ta, pbssid, ETH_ALEN);
502 res = ap2sta_data_frame(adapter, precv_frame, &psta);
503 break;
504 case 2:
505 memcpy(pattrib->ra, pbssid, ETH_ALEN);
506 memcpy(pattrib->ta, psa, ETH_ALEN);
507 res = sta2ap_data_frame(adapter, precv_frame, &psta);
508 break;
509 case 3:
510 memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
511 memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
512 return _FAIL;
513 default:
514 return _FAIL;
515 }
516 if (res == _FAIL)
517 return _FAIL;
518 if (psta == NULL)
519 return _FAIL;
520 precv_frame->u.hdr.psta = psta;
521 pattrib->amsdu = 0;
522 /* parsing QC field */
523 if (pattrib->qos == 1) {
524 pattrib->priority = GetPriority((ptr + 24));
525 pattrib->ack_policy = GetAckpolicy((ptr + 24));
526 pattrib->amsdu = GetAMsdu((ptr + 24));
527 pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 32 : 26;
528 } else {
529 pattrib->priority = 0;
530 pattrib->hdrlen = (pattrib->to_fr_ds == 3) ? 30 : 24;
531 }
532
533 if (pattrib->order)/*HT-CTRL 11n*/
534 pattrib->hdrlen += 4;
535 precv_frame->u.hdr.preorder_ctrl =
536 &psta->recvreorder_ctrl[pattrib->priority];
537
538 /* decache, drop duplicate recv packets */
539 if (recv_decache(precv_frame, bretry, &psta->sta_recvpriv.rxcache) ==
540 _FAIL)
541 return _FAIL;
542
543 if (pattrib->privacy) {
544 GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt,
545 IS_MCAST(pattrib->ra));
546 SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len,
547 pattrib->encrypt);
548 } else {
549 pattrib->encrypt = 0;
550 pattrib->iv_len = pattrib->icv_len = 0;
551 }
552 return _SUCCESS;
553 }
554
r8712_validate_recv_frame(struct _adapter * adapter,union recv_frame * precv_frame)555 sint r8712_validate_recv_frame(struct _adapter *adapter,
556 union recv_frame *precv_frame)
557 {
558 /*shall check frame subtype, to / from ds, da, bssid */
559 /*then call check if rx seq/frag. duplicated.*/
560
561 u8 type;
562 u8 subtype;
563 sint retval = _SUCCESS;
564 struct rx_pkt_attrib *pattrib = &precv_frame->u.hdr.attrib;
565
566 u8 *ptr = precv_frame->u.hdr.rx_data;
567 u8 ver = (unsigned char)(*ptr) & 0x3;
568
569 /*add version chk*/
570 if (ver != 0)
571 return _FAIL;
572 type = GetFrameType(ptr);
573 subtype = GetFrameSubType(ptr); /*bit(7)~bit(2)*/
574 pattrib->to_fr_ds = get_tofr_ds(ptr);
575 pattrib->frag_num = GetFragNum(ptr);
576 pattrib->seq_num = GetSequence(ptr);
577 pattrib->pw_save = GetPwrMgt(ptr);
578 pattrib->mfrag = GetMFrag(ptr);
579 pattrib->mdata = GetMData(ptr);
580 pattrib->privacy = GetPrivacy(ptr);
581 pattrib->order = GetOrder(ptr);
582 switch (type) {
583 case WIFI_MGT_TYPE: /*mgnt*/
584 retval = validate_recv_mgnt_frame(adapter, precv_frame);
585 break;
586 case WIFI_CTRL_TYPE:/*ctrl*/
587 retval = validate_recv_ctrl_frame(adapter, precv_frame);
588 break;
589 case WIFI_DATA_TYPE: /*data*/
590 pattrib->qos = (subtype & BIT(7)) ? 1 : 0;
591 retval = validate_recv_data_frame(adapter, precv_frame);
592 break;
593 default:
594 return _FAIL;
595 }
596 return retval;
597 }
598
r8712_wlanhdr_to_ethhdr(union recv_frame * precvframe)599 sint r8712_wlanhdr_to_ethhdr(union recv_frame *precvframe)
600 {
601 /*remove the wlanhdr and add the eth_hdr*/
602 sint rmv_len;
603 u16 len;
604 u8 bsnaphdr;
605 u8 *psnap_type;
606 struct ieee80211_snap_hdr *psnap;
607 struct _adapter *adapter = precvframe->u.hdr.adapter;
608 struct mlme_priv *pmlmepriv = &adapter->mlmepriv;
609
610 u8 *ptr = get_recvframe_data(precvframe); /*point to frame_ctrl field*/
611 struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.attrib;
612
613 if (pattrib->encrypt)
614 recvframe_pull_tail(precvframe, pattrib->icv_len);
615 psnap = (struct ieee80211_snap_hdr *)(ptr + pattrib->hdrlen +
616 pattrib->iv_len);
617 psnap_type = ptr + pattrib->hdrlen + pattrib->iv_len + SNAP_SIZE;
618 /* convert hdr + possible LLC headers into Ethernet header */
619 if ((!memcmp(psnap, (void *)rfc1042_header, SNAP_SIZE) &&
620 (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_IPX, 2)) &&
621 (memcmp(psnap_type, (void *)SNAP_ETH_TYPE_APPLETALK_AARP, 2))) ||
622 !memcmp(psnap, (void *)bridge_tunnel_header, SNAP_SIZE)) {
623 /* remove RFC1042 or Bridge-Tunnel encapsulation and
624 * replace EtherType */
625 bsnaphdr = true;
626 } else {
627 /* Leave Ethernet header part of hdr and full payload */
628 bsnaphdr = false;
629 }
630 rmv_len = pattrib->hdrlen + pattrib->iv_len +
631 (bsnaphdr ? SNAP_SIZE : 0);
632 len = precvframe->u.hdr.len - rmv_len;
633 if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
634 ptr += rmv_len;
635 *ptr = 0x87;
636 *(ptr+1) = 0x12;
637 /* append rx status for mp test packets */
638 ptr = recvframe_pull(precvframe, (rmv_len -
639 sizeof(struct ethhdr) + 2) - 24);
640 memcpy(ptr, get_rxmem(precvframe), 24);
641 ptr += 24;
642 } else
643 ptr = recvframe_pull(precvframe, (rmv_len -
644 sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0)));
645
646 memcpy(ptr, pattrib->dst, ETH_ALEN);
647 memcpy(ptr+ETH_ALEN, pattrib->src, ETH_ALEN);
648 if (!bsnaphdr) {
649 len = htons(len);
650 memcpy(ptr + 12, &len, 2);
651 }
652 return _SUCCESS;
653 }
654
r8712_recv_entry(union recv_frame * precvframe)655 s32 r8712_recv_entry(union recv_frame *precvframe)
656 {
657 struct _adapter *padapter;
658 struct recv_priv *precvpriv;
659
660 s32 ret = _SUCCESS;
661
662 padapter = precvframe->u.hdr.adapter;
663 precvpriv = &(padapter->recvpriv);
664
665 padapter->ledpriv.LedControlHandler(padapter, LED_CTL_RX);
666
667 ret = recv_func(padapter, precvframe);
668 if (ret == _FAIL)
669 goto _recv_entry_drop;
670 precvpriv->rx_pkts++;
671 precvpriv->rx_bytes += (uint)(precvframe->u.hdr.rx_tail -
672 precvframe->u.hdr.rx_data);
673 return ret;
674 _recv_entry_drop:
675 precvpriv->rx_drop++;
676 padapter->mppriv.rx_pktloss = precvpriv->rx_drop;
677 return ret;
678 }
679