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rtllib_rx.c
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1 /*
2  * Original code based Host AP (software wireless LAN access point) driver
3  * for Intersil Prism2/2.5/3 - hostap.o module, common routines
4  *
5  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
6  * <[email protected]>
7  * Copyright (c) 2002-2003, Jouni Malinen <[email protected]>
8  * Copyright (c) 2004, Intel Corporation
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation. See README and COPYING for
13  * more details.
14  ******************************************************************************
15 
16  Few modifications for Realtek's Wi-Fi drivers by
17  Andrea Merello <[email protected]>
18 
19  A special thanks goes to Realtek for their support !
20 
21 ******************************************************************************/
22 
23 
24 #include <linux/compiler.h>
25 #include <linux/errno.h>
26 #include <linux/if_arp.h>
27 #include <linux/in6.h>
28 #include <linux/in.h>
29 #include <linux/ip.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/netdevice.h>
33 #include <linux/pci.h>
34 #include <linux/proc_fs.h>
35 #include <linux/skbuff.h>
36 #include <linux/slab.h>
37 #include <linux/tcp.h>
38 #include <linux/types.h>
39 #include <linux/wireless.h>
40 #include <linux/etherdevice.h>
41 #include <linux/uaccess.h>
42 #include <linux/ctype.h>
43 
44 #include "rtllib.h"
45 #include "dot11d.h"
46 
47 static inline void rtllib_monitor_rx(struct rtllib_device *ieee,
48  struct sk_buff *skb, struct rtllib_rx_stats *rx_status,
49  size_t hdr_length)
50 {
51  skb->dev = ieee->dev;
52  skb_reset_mac_header(skb);
53  skb_pull(skb, hdr_length);
54  skb->pkt_type = PACKET_OTHERHOST;
55  skb->protocol = __constant_htons(ETH_P_80211_RAW);
56  memset(skb->cb, 0, sizeof(skb->cb));
57  netif_rx(skb);
58 }
59 
60 /* Called only as a tasklet (software IRQ) */
61 static struct rtllib_frag_entry *
62 rtllib_frag_cache_find(struct rtllib_device *ieee, unsigned int seq,
63  unsigned int frag, u8 tid, u8 *src, u8 *dst)
64 {
65  struct rtllib_frag_entry *entry;
66  int i;
67 
68  for (i = 0; i < RTLLIB_FRAG_CACHE_LEN; i++) {
69  entry = &ieee->frag_cache[tid][i];
70  if (entry->skb != NULL &&
71  time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
72  RTLLIB_DEBUG_FRAG(
73  "expiring fragment cache entry "
74  "seq=%u last_frag=%u\n",
75  entry->seq, entry->last_frag);
76  dev_kfree_skb_any(entry->skb);
77  entry->skb = NULL;
78  }
79 
80  if (entry->skb != NULL && entry->seq == seq &&
81  (entry->last_frag + 1 == frag || frag == -1) &&
82  memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
83  memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
84  return entry;
85  }
86 
87  return NULL;
88 }
89 
90 /* Called only as a tasklet (software IRQ) */
91 static struct sk_buff *
92 rtllib_frag_cache_get(struct rtllib_device *ieee,
93  struct rtllib_hdr_4addr *hdr)
94 {
95  struct sk_buff *skb = NULL;
96  u16 fc = le16_to_cpu(hdr->frame_ctl);
97  u16 sc = le16_to_cpu(hdr->seq_ctl);
98  unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
99  unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
100  struct rtllib_frag_entry *entry;
101  struct rtllib_hdr_3addrqos *hdr_3addrqos;
102  struct rtllib_hdr_4addrqos *hdr_4addrqos;
103  u8 tid;
104 
105  if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) && RTLLIB_QOS_HAS_SEQ(fc)) {
106  hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
107  tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
108  tid = UP2AC(tid);
109  tid++;
110  } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
111  hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
112  tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
113  tid = UP2AC(tid);
114  tid++;
115  } else {
116  tid = 0;
117  }
118 
119  if (frag == 0) {
120  /* Reserve enough space to fit maximum frame length */
121  skb = dev_alloc_skb(ieee->dev->mtu +
122  sizeof(struct rtllib_hdr_4addr) +
123  8 /* LLC */ +
124  2 /* alignment */ +
125  8 /* WEP */ +
126  ETH_ALEN /* WDS */ +
127  (RTLLIB_QOS_HAS_SEQ(fc) ? 2 : 0) /* QOS Control */);
128  if (skb == NULL)
129  return NULL;
130 
131  entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
132  ieee->frag_next_idx[tid]++;
133  if (ieee->frag_next_idx[tid] >= RTLLIB_FRAG_CACHE_LEN)
134  ieee->frag_next_idx[tid] = 0;
135 
136  if (entry->skb != NULL)
137  dev_kfree_skb_any(entry->skb);
138 
139  entry->first_frag_time = jiffies;
140  entry->seq = seq;
141  entry->last_frag = frag;
142  entry->skb = skb;
143  memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
144  memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
145  } else {
146  /* received a fragment of a frame for which the head fragment
147  * should have already been received */
148  entry = rtllib_frag_cache_find(ieee, seq, frag, tid, hdr->addr2,
149  hdr->addr1);
150  if (entry != NULL) {
151  entry->last_frag = frag;
152  skb = entry->skb;
153  }
154  }
155 
156  return skb;
157 }
158 
159 
160 /* Called only as a tasklet (software IRQ) */
161 static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
162  struct rtllib_hdr_4addr *hdr)
163 {
164  u16 fc = le16_to_cpu(hdr->frame_ctl);
165  u16 sc = le16_to_cpu(hdr->seq_ctl);
166  unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
167  struct rtllib_frag_entry *entry;
168  struct rtllib_hdr_3addrqos *hdr_3addrqos;
169  struct rtllib_hdr_4addrqos *hdr_4addrqos;
170  u8 tid;
171 
172  if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) && RTLLIB_QOS_HAS_SEQ(fc)) {
173  hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
174  tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
175  tid = UP2AC(tid);
176  tid++;
177  } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
178  hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
179  tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
180  tid = UP2AC(tid);
181  tid++;
182  } else {
183  tid = 0;
184  }
185 
186  entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
187  hdr->addr1);
188 
189  if (entry == NULL) {
190  RTLLIB_DEBUG_FRAG(
191  "could not invalidate fragment cache "
192  "entry (seq=%u)\n", seq);
193  return -1;
194  }
195 
196  entry->skb = NULL;
197  return 0;
198 }
199 
200 /* rtllib_rx_frame_mgtmt
201  *
202  * Responsible for handling management control frames
203  *
204  * Called by rtllib_rx */
205 static inline int
206 rtllib_rx_frame_mgmt(struct rtllib_device *ieee, struct sk_buff *skb,
207  struct rtllib_rx_stats *rx_stats, u16 type,
208  u16 stype)
209 {
210  /* On the struct stats definition there is written that
211  * this is not mandatory.... but seems that the probe
212  * response parser uses it
213  */
214  struct rtllib_hdr_3addr * hdr = (struct rtllib_hdr_3addr *)skb->data;
215 
216  rx_stats->len = skb->len;
217  rtllib_rx_mgt(ieee, skb, rx_stats);
218  if ((memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN))) {
219  dev_kfree_skb_any(skb);
220  return 0;
221  }
222  rtllib_rx_frame_softmac(ieee, skb, rx_stats, type, stype);
223 
224  dev_kfree_skb_any(skb);
225 
226  return 0;
227 }
228 
229 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
230 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
231 static unsigned char rfc1042_header[] = {
232  0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
233 };
234 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
235 static unsigned char bridge_tunnel_header[] = {
236  0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8
237 };
238 /* No encapsulation header if EtherType < 0x600 (=length) */
239 
240 /* Called by rtllib_rx_frame_decrypt */
241 static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
242  struct sk_buff *skb, size_t hdrlen)
243 {
244  struct net_device *dev = ieee->dev;
245  u16 fc, ethertype;
246  struct rtllib_hdr_4addr *hdr;
247  u8 *pos;
248 
249  if (skb->len < 24)
250  return 0;
251 
252  hdr = (struct rtllib_hdr_4addr *) skb->data;
253  fc = le16_to_cpu(hdr->frame_ctl);
254 
255  /* check that the frame is unicast frame to us */
256  if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
257  RTLLIB_FCTL_TODS &&
258  memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
259  memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
260  /* ToDS frame with own addr BSSID and DA */
261  } else if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
262  RTLLIB_FCTL_FROMDS &&
263  memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
264  /* FromDS frame with own addr as DA */
265  } else
266  return 0;
267 
268  if (skb->len < 24 + 8)
269  return 0;
270 
271  /* check for port access entity Ethernet type */
272  pos = skb->data + hdrlen;
273  ethertype = (pos[6] << 8) | pos[7];
274  if (ethertype == ETH_P_PAE)
275  return 1;
276 
277  return 0;
278 }
279 
280 /* Called only as a tasklet (software IRQ), by rtllib_rx */
281 static inline int
282 rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
283  struct lib80211_crypt_data *crypt)
284 {
285  struct rtllib_hdr_4addr *hdr;
286  int res, hdrlen;
287 
288  if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
289  return 0;
290 
291  if (ieee->hwsec_active) {
292  struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
293  tcb_desc->bHwSec = 1;
294 
295  if (ieee->need_sw_enc)
296  tcb_desc->bHwSec = 0;
297  }
298 
299  hdr = (struct rtllib_hdr_4addr *) skb->data;
300  hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
301 
302  atomic_inc(&crypt->refcnt);
303  res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
304  atomic_dec(&crypt->refcnt);
305  if (res < 0) {
306  RTLLIB_DEBUG_DROP(
307  "decryption failed (SA= %pM"
308  ") res=%d\n", hdr->addr2, res);
309  if (res == -2)
310  RTLLIB_DEBUG_DROP("Decryption failed ICV "
311  "mismatch (key %d)\n",
312  skb->data[hdrlen + 3] >> 6);
313  ieee->ieee_stats.rx_discards_undecryptable++;
314  return -1;
315  }
316 
317  return res;
318 }
319 
320 
321 /* Called only as a tasklet (software IRQ), by rtllib_rx */
322 static inline int
323 rtllib_rx_frame_decrypt_msdu(struct rtllib_device *ieee, struct sk_buff *skb,
324  int keyidx, struct lib80211_crypt_data *crypt)
325 {
326  struct rtllib_hdr_4addr *hdr;
327  int res, hdrlen;
328 
329  if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
330  return 0;
331  if (ieee->hwsec_active) {
332  struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
333  tcb_desc->bHwSec = 1;
334 
335  if (ieee->need_sw_enc)
336  tcb_desc->bHwSec = 0;
337  }
338 
339  hdr = (struct rtllib_hdr_4addr *) skb->data;
340  hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
341 
342  atomic_inc(&crypt->refcnt);
343  res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
344  atomic_dec(&crypt->refcnt);
345  if (res < 0) {
346  printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
347  " (SA= %pM keyidx=%d)\n",
348  ieee->dev->name, hdr->addr2, keyidx);
349  return -1;
350  }
351 
352  return 0;
353 }
354 
355 
356 /* this function is stolen from ipw2200 driver*/
357 #define IEEE_PACKET_RETRY_TIME (5*HZ)
358 static int is_duplicate_packet(struct rtllib_device *ieee,
359  struct rtllib_hdr_4addr *header)
360 {
361  u16 fc = le16_to_cpu(header->frame_ctl);
362  u16 sc = le16_to_cpu(header->seq_ctl);
363  u16 seq = WLAN_GET_SEQ_SEQ(sc);
364  u16 frag = WLAN_GET_SEQ_FRAG(sc);
365  u16 *last_seq, *last_frag;
366  unsigned long *last_time;
367  struct rtllib_hdr_3addrqos *hdr_3addrqos;
368  struct rtllib_hdr_4addrqos *hdr_4addrqos;
369  u8 tid;
370 
371  if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) && RTLLIB_QOS_HAS_SEQ(fc)) {
372  hdr_4addrqos = (struct rtllib_hdr_4addrqos *)header;
373  tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
374  tid = UP2AC(tid);
375  tid++;
376  } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
377  hdr_3addrqos = (struct rtllib_hdr_3addrqos *)header;
378  tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
379  tid = UP2AC(tid);
380  tid++;
381  } else {
382  tid = 0;
383  }
384 
385  switch (ieee->iw_mode) {
386  case IW_MODE_ADHOC:
387  {
388  struct list_head *p;
389  struct ieee_ibss_seq *entry = NULL;
390  u8 *mac = header->addr2;
391  int index = mac[5] % IEEE_IBSS_MAC_HASH_SIZE;
392  list_for_each(p, &ieee->ibss_mac_hash[index]) {
393  entry = list_entry(p, struct ieee_ibss_seq, list);
394  if (!memcmp(entry->mac, mac, ETH_ALEN))
395  break;
396  }
397  if (p == &ieee->ibss_mac_hash[index]) {
398  entry = kmalloc(sizeof(struct ieee_ibss_seq), GFP_ATOMIC);
399  if (!entry) {
400  printk(KERN_WARNING "Cannot malloc new mac entry\n");
401  return 0;
402  }
403  memcpy(entry->mac, mac, ETH_ALEN);
404  entry->seq_num[tid] = seq;
405  entry->frag_num[tid] = frag;
406  entry->packet_time[tid] = jiffies;
407  list_add(&entry->list, &ieee->ibss_mac_hash[index]);
408  return 0;
409  }
410  last_seq = &entry->seq_num[tid];
411  last_frag = &entry->frag_num[tid];
412  last_time = &entry->packet_time[tid];
413  break;
414  }
415 
416  case IW_MODE_INFRA:
417  last_seq = &ieee->last_rxseq_num[tid];
418  last_frag = &ieee->last_rxfrag_num[tid];
419  last_time = &ieee->last_packet_time[tid];
420  break;
421  default:
422  return 0;
423  }
424 
425  if ((*last_seq == seq) &&
426  time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
427  if (*last_frag == frag)
428  goto drop;
429  if (*last_frag + 1 != frag)
430  /* out-of-order fragment */
431  goto drop;
432  } else
433  *last_seq = seq;
434 
435  *last_frag = frag;
436  *last_time = jiffies;
437  return 0;
438 
439 drop:
440 
441  return 1;
442 }
443 
444 static bool AddReorderEntry(struct rx_ts_record *pTS,
445  struct rx_reorder_entry *pReorderEntry)
446 {
447  struct list_head *pList = &pTS->RxPendingPktList;
448 
449  while (pList->next != &pTS->RxPendingPktList) {
450  if (SN_LESS(pReorderEntry->SeqNum, ((struct rx_reorder_entry *)
451  list_entry(pList->next, struct rx_reorder_entry,
452  List))->SeqNum))
453  pList = pList->next;
454  else if (SN_EQUAL(pReorderEntry->SeqNum,
455  ((struct rx_reorder_entry *)list_entry(pList->next,
456  struct rx_reorder_entry, List))->SeqNum))
457  return false;
458  else
459  break;
460  }
461  pReorderEntry->List.next = pList->next;
462  pReorderEntry->List.next->prev = &pReorderEntry->List;
463  pReorderEntry->List.prev = pList;
464  pList->next = &pReorderEntry->List;
465 
466  return true;
467 }
468 
469 void rtllib_indicate_packets(struct rtllib_device *ieee, struct rtllib_rxb **prxbIndicateArray, u8 index)
470 {
471  struct net_device_stats *stats = &ieee->stats;
472  u8 i = 0 , j = 0;
473  u16 ethertype;
474  for (j = 0; j < index; j++) {
475  struct rtllib_rxb *prxb = prxbIndicateArray[j];
476  for (i = 0; i < prxb->nr_subframes; i++) {
477  struct sk_buff *sub_skb = prxb->subframes[i];
478 
479  /* convert hdr + possible LLC headers into Ethernet header */
480  ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
481  if (sub_skb->len >= 8 &&
482  ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
483  ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
484  memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
485  /* remove RFC1042 or Bridge-Tunnel encapsulation
486  * and replace EtherType */
487  skb_pull(sub_skb, SNAP_SIZE);
488  memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
489  memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
490  } else {
491  u16 len;
492  /* Leave Ethernet header part of hdr and full payload */
493  len = htons(sub_skb->len);
494  memcpy(skb_push(sub_skb, 2), &len, 2);
495  memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
496  memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
497  }
498 
499  /* Indicate the packets to upper layer */
500  if (sub_skb) {
501  stats->rx_packets++;
502  stats->rx_bytes += sub_skb->len;
503 
504  memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
505  sub_skb->protocol = eth_type_trans(sub_skb, ieee->dev);
506  sub_skb->dev = ieee->dev;
507  sub_skb->dev->stats.rx_packets++;
508  sub_skb->dev->stats.rx_bytes += sub_skb->len;
509  sub_skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
510  ieee->last_rx_ps_time = jiffies;
511  netif_rx(sub_skb);
512  }
513  }
514  kfree(prxb);
515  prxb = NULL;
516  }
517 }
518 
519 void rtllib_FlushRxTsPendingPkts(struct rtllib_device *ieee, struct rx_ts_record *pTS)
520 {
521  struct rx_reorder_entry *pRxReorderEntry;
522  u8 RfdCnt = 0;
523 
524  del_timer_sync(&pTS->RxPktPendingTimer);
525  while (!list_empty(&pTS->RxPendingPktList)) {
526  if (RfdCnt >= REORDER_WIN_SIZE) {
527  printk(KERN_INFO "-------------->%s() error! RfdCnt >= REORDER_WIN_SIZE\n", __func__);
528  break;
529  }
530 
531  pRxReorderEntry = (struct rx_reorder_entry *)list_entry(pTS->RxPendingPktList.prev, struct rx_reorder_entry, List);
532  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): Indicate SeqNum %d!\n", __func__, pRxReorderEntry->SeqNum);
533  list_del_init(&pRxReorderEntry->List);
534 
535  ieee->RfdArray[RfdCnt] = pRxReorderEntry->prxb;
536 
537  RfdCnt = RfdCnt + 1;
538  list_add_tail(&pRxReorderEntry->List, &ieee->RxReorder_Unused_List);
539  }
540  rtllib_indicate_packets(ieee, ieee->RfdArray, RfdCnt);
541 
542  pTS->RxIndicateSeq = 0xffff;
543 }
544 
545 static void RxReorderIndicatePacket(struct rtllib_device *ieee,
546  struct rtllib_rxb *prxb,
547  struct rx_ts_record *pTS, u16 SeqNum)
548 {
549  struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
550  struct rx_reorder_entry *pReorderEntry = NULL;
551  u8 WinSize = pHTInfo->RxReorderWinSize;
552  u16 WinEnd = 0;
553  u8 index = 0;
554  bool bMatchWinStart = false, bPktInBuf = false;
555  unsigned long flags;
556 
557  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): Seq is %d, pTS->RxIndicateSeq"
558  " is %d, WinSize is %d\n", __func__, SeqNum,
559  pTS->RxIndicateSeq, WinSize);
560 
561  spin_lock_irqsave(&(ieee->reorder_spinlock), flags);
562 
563  WinEnd = (pTS->RxIndicateSeq + WinSize - 1) % 4096;
564  /* Rx Reorder initialize condition.*/
565  if (pTS->RxIndicateSeq == 0xffff)
566  pTS->RxIndicateSeq = SeqNum;
567 
568  /* Drop out the packet which SeqNum is smaller than WinStart */
569  if (SN_LESS(SeqNum, pTS->RxIndicateSeq)) {
570  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
571  pTS->RxIndicateSeq, SeqNum);
572  pHTInfo->RxReorderDropCounter++;
573  {
574  int i;
575  for (i = 0; i < prxb->nr_subframes; i++)
576  dev_kfree_skb(prxb->subframes[i]);
577  kfree(prxb);
578  prxb = NULL;
579  }
580  spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
581  return;
582  }
583 
584  /*
585  * Sliding window manipulation. Conditions includes:
586  * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
587  * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
588  */
589  if (SN_EQUAL(SeqNum, pTS->RxIndicateSeq)) {
590  pTS->RxIndicateSeq = (pTS->RxIndicateSeq + 1) % 4096;
591  bMatchWinStart = true;
592  } else if (SN_LESS(WinEnd, SeqNum)) {
593  if (SeqNum >= (WinSize - 1))
594  pTS->RxIndicateSeq = SeqNum + 1 - WinSize;
595  else
596  pTS->RxIndicateSeq = 4095 - (WinSize - (SeqNum + 1)) + 1;
597  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "Window Shift! IndicateSeq: %d,"
598  " NewSeq: %d\n", pTS->RxIndicateSeq, SeqNum);
599  }
600 
601  /*
602  * Indication process.
603  * After Packet dropping and Sliding Window shifting as above, we can
604  * now just indicate the packets with the SeqNum smaller than latest
605  * WinStart and struct buffer other packets.
606  */
607  /* For Rx Reorder condition:
608  * 1. All packets with SeqNum smaller than WinStart => Indicate
609  * 2. All packets with SeqNum larger than or equal to
610  * WinStart => Buffer it.
611  */
612  if (bMatchWinStart) {
613  /* Current packet is going to be indicated.*/
614  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "Packets indication!! "
615  "IndicateSeq: %d, NewSeq: %d\n",
616  pTS->RxIndicateSeq, SeqNum);
617  ieee->prxbIndicateArray[0] = prxb;
618  index = 1;
619  } else {
620  /* Current packet is going to be inserted into pending list.*/
621  if (!list_empty(&ieee->RxReorder_Unused_List)) {
622  pReorderEntry = (struct rx_reorder_entry *)
623  list_entry(ieee->RxReorder_Unused_List.next,
624  struct rx_reorder_entry, List);
625  list_del_init(&pReorderEntry->List);
626 
627  /* Make a reorder entry and insert into a the packet list.*/
628  pReorderEntry->SeqNum = SeqNum;
629  pReorderEntry->prxb = prxb;
630 
631  if (!AddReorderEntry(pTS, pReorderEntry)) {
632  RTLLIB_DEBUG(RTLLIB_DL_REORDER,
633  "%s(): Duplicate packet is "
634  "dropped!! IndicateSeq: %d, "
635  "NewSeq: %d\n",
636  __func__, pTS->RxIndicateSeq,
637  SeqNum);
638  list_add_tail(&pReorderEntry->List,
639  &ieee->RxReorder_Unused_List); {
640  int i;
641  for (i = 0; i < prxb->nr_subframes; i++)
642  dev_kfree_skb(prxb->subframes[i]);
643  kfree(prxb);
644  prxb = NULL;
645  }
646  } else {
647  RTLLIB_DEBUG(RTLLIB_DL_REORDER,
648  "Pkt insert into struct buffer!! "
649  "IndicateSeq: %d, NewSeq: %d\n",
650  pTS->RxIndicateSeq, SeqNum);
651  }
652  } else {
653  /*
654  * Packets are dropped if there are not enough reorder
655  * entries. This part should be modified!! We can just
656  * indicate all the packets in struct buffer and get
657  * reorder entries.
658  */
659  RTLLIB_DEBUG(RTLLIB_DL_ERR, "RxReorderIndicatePacket():"
660  " There is no reorder entry!! Packet is "
661  "dropped!!\n");
662  {
663  int i;
664  for (i = 0; i < prxb->nr_subframes; i++)
665  dev_kfree_skb(prxb->subframes[i]);
666  kfree(prxb);
667  prxb = NULL;
668  }
669  }
670  }
671 
672  /* Check if there is any packet need indicate.*/
673  while (!list_empty(&pTS->RxPendingPktList)) {
674  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): start RREORDER indicate\n", __func__);
675 
676  pReorderEntry = (struct rx_reorder_entry *)list_entry(pTS->RxPendingPktList.prev,
677  struct rx_reorder_entry, List);
678  if (SN_LESS(pReorderEntry->SeqNum, pTS->RxIndicateSeq) ||
679  SN_EQUAL(pReorderEntry->SeqNum, pTS->RxIndicateSeq)) {
680  /* This protect struct buffer from overflow. */
681  if (index >= REORDER_WIN_SIZE) {
682  RTLLIB_DEBUG(RTLLIB_DL_ERR, "RxReorderIndicate"
683  "Packet(): Buffer overflow!!\n");
684  bPktInBuf = true;
685  break;
686  }
687 
688  list_del_init(&pReorderEntry->List);
689 
690  if (SN_EQUAL(pReorderEntry->SeqNum, pTS->RxIndicateSeq))
691  pTS->RxIndicateSeq = (pTS->RxIndicateSeq + 1) % 4096;
692 
693  ieee->prxbIndicateArray[index] = pReorderEntry->prxb;
694  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): Indicate SeqNum"
695  " %d!\n", __func__, pReorderEntry->SeqNum);
696  index++;
697 
698  list_add_tail(&pReorderEntry->List,
699  &ieee->RxReorder_Unused_List);
700  } else {
701  bPktInBuf = true;
702  break;
703  }
704  }
705 
706  /* Handling pending timer. Set this timer to prevent from long time
707  * Rx buffering.*/
708  if (index > 0) {
709  if (timer_pending(&pTS->RxPktPendingTimer))
710  del_timer_sync(&pTS->RxPktPendingTimer);
711  pTS->RxTimeoutIndicateSeq = 0xffff;
712 
713  if (index > REORDER_WIN_SIZE) {
714  RTLLIB_DEBUG(RTLLIB_DL_ERR, "RxReorderIndicatePacket():"
715  " Rx Reorer struct buffer full!!\n");
716  spin_unlock_irqrestore(&(ieee->reorder_spinlock),
717  flags);
718  return;
719  }
720  rtllib_indicate_packets(ieee, ieee->prxbIndicateArray, index);
721  bPktInBuf = false;
722  }
723 
724  if (bPktInBuf && pTS->RxTimeoutIndicateSeq == 0xffff) {
725  RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): SET rx timeout timer\n",
726  __func__);
727  pTS->RxTimeoutIndicateSeq = pTS->RxIndicateSeq;
728  mod_timer(&pTS->RxPktPendingTimer, jiffies +
729  MSECS(pHTInfo->RxReorderPendingTime));
730  }
731  spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
732 }
733 
734 static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
735  struct rtllib_rx_stats *rx_stats,
736  struct rtllib_rxb *rxb, u8 *src, u8 *dst)
737 {
738  struct rtllib_hdr_3addr *hdr = (struct rtllib_hdr_3addr *)skb->data;
739  u16 fc = le16_to_cpu(hdr->frame_ctl);
740 
741  u16 LLCOffset = sizeof(struct rtllib_hdr_3addr);
742  u16 ChkLength;
743  bool bIsAggregateFrame = false;
744  u16 nSubframe_Length;
745  u8 nPadding_Length = 0;
746  u16 SeqNum = 0;
747  struct sk_buff *sub_skb;
748  u8 *data_ptr;
749  /* just for debug purpose */
750  SeqNum = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctl));
751  if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
752  (((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
753  bIsAggregateFrame = true;
754 
755  if (RTLLIB_QOS_HAS_SEQ(fc))
756  LLCOffset += 2;
757  if (rx_stats->bContainHTC)
758  LLCOffset += sHTCLng;
759 
760  ChkLength = LLCOffset;
761 
762  if (skb->len <= ChkLength)
763  return 0;
764 
765  skb_pull(skb, LLCOffset);
766  ieee->bIsAggregateFrame = bIsAggregateFrame;
767  if (!bIsAggregateFrame) {
768  rxb->nr_subframes = 1;
769 
770  /* altered by clark 3/30/2010
771  * The struct buffer size of the skb indicated to upper layer
772  * must be less than 5000, or the defraged IP datagram
773  * in the IP layer will exceed "ipfrag_high_tresh" and be
774  * discarded. so there must not use the function
775  * "skb_copy" and "skb_clone" for "skb".
776  */
777 
778  /* Allocate new skb for releasing to upper layer */
779  sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
780  skb_reserve(sub_skb, 12);
781  data_ptr = (u8 *)skb_put(sub_skb, skb->len);
782  memcpy(data_ptr, skb->data, skb->len);
783  sub_skb->dev = ieee->dev;
784 
785  rxb->subframes[0] = sub_skb;
786 
787  memcpy(rxb->src, src, ETH_ALEN);
788  memcpy(rxb->dst, dst, ETH_ALEN);
789  rxb->subframes[0]->dev = ieee->dev;
790  return 1;
791  } else {
792  rxb->nr_subframes = 0;
793  memcpy(rxb->src, src, ETH_ALEN);
794  memcpy(rxb->dst, dst, ETH_ALEN);
795  while (skb->len > ETHERNET_HEADER_SIZE) {
796  /* Offset 12 denote 2 mac address */
797  nSubframe_Length = *((u16 *)(skb->data + 12));
798  nSubframe_Length = (nSubframe_Length >> 8) +
799  (nSubframe_Length << 8);
800 
801  if (skb->len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
802  printk(KERN_INFO "%s: A-MSDU parse error!! "
803  "pRfd->nTotalSubframe : %d\n",\
804  __func__, rxb->nr_subframes);
805  printk(KERN_INFO "%s: A-MSDU parse error!! "
806  "Subframe Length: %d\n", __func__,
807  nSubframe_Length);
808  printk(KERN_INFO "nRemain_Length is %d and "
809  "nSubframe_Length is : %d\n", skb->len,
810  nSubframe_Length);
811  printk(KERN_INFO "The Packet SeqNum is %d\n", SeqNum);
812  return 0;
813  }
814 
815  /* move the data point to data content */
816  skb_pull(skb, ETHERNET_HEADER_SIZE);
817 
818  /* altered by clark 3/30/2010
819  * The struct buffer size of the skb indicated to upper layer
820  * must be less than 5000, or the defraged IP datagram
821  * in the IP layer will exceed "ipfrag_high_tresh" and be
822  * discarded. so there must not use the function
823  * "skb_copy" and "skb_clone" for "skb".
824  */
825 
826  /* Allocate new skb for releasing to upper layer */
827  sub_skb = dev_alloc_skb(nSubframe_Length + 12);
828  skb_reserve(sub_skb, 12);
829  data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
830  memcpy(data_ptr, skb->data, nSubframe_Length);
831 
832  sub_skb->dev = ieee->dev;
833  rxb->subframes[rxb->nr_subframes++] = sub_skb;
834  if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
835  RTLLIB_DEBUG_RX("ParseSubframe(): Too many "
836  "Subframes! Packets dropped!\n");
837  break;
838  }
839  skb_pull(skb, nSubframe_Length);
840 
841  if (skb->len != 0) {
842  nPadding_Length = 4 - ((nSubframe_Length +
843  ETHERNET_HEADER_SIZE) % 4);
844  if (nPadding_Length == 4)
845  nPadding_Length = 0;
846 
847  if (skb->len < nPadding_Length)
848  return 0;
849 
850  skb_pull(skb, nPadding_Length);
851  }
852  }
853 
854  return rxb->nr_subframes;
855  }
856 }
857 
858 
859 static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
860  struct sk_buff *skb,
861  struct rtllib_rx_stats *rx_stats)
862 {
863  struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
864  u16 fc = le16_to_cpu(hdr->frame_ctl);
865  size_t hdrlen = 0;
866 
867  hdrlen = rtllib_get_hdrlen(fc);
868  if (HTCCheck(ieee, skb->data)) {
869  if (net_ratelimit())
870  printk(KERN_INFO "%s: find HTCControl!\n", __func__);
871  hdrlen += 4;
872  rx_stats->bContainHTC = 1;
873  }
874 
875  if (RTLLIB_QOS_HAS_SEQ(fc))
876  rx_stats->bIsQosData = 1;
877 
878  return hdrlen;
879 }
880 
881 static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
882  struct sk_buff *skb, u8 multicast)
883 {
884  struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
885  u16 fc, sc;
886  u8 frag, type, stype;
887 
888  fc = le16_to_cpu(hdr->frame_ctl);
889  type = WLAN_FC_GET_TYPE(fc);
890  stype = WLAN_FC_GET_STYPE(fc);
891  sc = le16_to_cpu(hdr->seq_ctl);
892  frag = WLAN_GET_SEQ_FRAG(sc);
893 
894  if ((ieee->pHTInfo->bCurRxReorderEnable == false) ||
895  !ieee->current_network.qos_data.active ||
896  !IsDataFrame(skb->data) ||
897  IsLegacyDataFrame(skb->data)) {
898  if (!((type == RTLLIB_FTYPE_MGMT) && (stype == RTLLIB_STYPE_BEACON))) {
899  if (is_duplicate_packet(ieee, hdr))
900  return -1;
901  }
902  } else {
903  struct rx_ts_record *pRxTS = NULL;
904  if (GetTs(ieee, (struct ts_common_info **) &pRxTS, hdr->addr2,
905  (u8)Frame_QoSTID((u8 *)(skb->data)), RX_DIR, true)) {
906  if ((fc & (1<<11)) && (frag == pRxTS->RxLastFragNum) &&
907  (WLAN_GET_SEQ_SEQ(sc) == pRxTS->RxLastSeqNum)) {
908  return -1;
909  } else {
910  pRxTS->RxLastFragNum = frag;
911  pRxTS->RxLastSeqNum = WLAN_GET_SEQ_SEQ(sc);
912  }
913  } else {
914  RTLLIB_DEBUG(RTLLIB_DL_ERR, "ERR!!%s(): No TS!! Skip"
915  " the check!!\n", __func__);
916  return -1;
917  }
918  }
919 
920  return 0;
921 }
922 
923 static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
924  struct rtllib_hdr_4addr *hdr, u8 *dst,
925  u8 *src, u8 *bssid)
926 {
927  u16 fc = le16_to_cpu(hdr->frame_ctl);
928 
929  switch (fc & (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) {
930  case RTLLIB_FCTL_FROMDS:
931  memcpy(dst, hdr->addr1, ETH_ALEN);
932  memcpy(src, hdr->addr3, ETH_ALEN);
933  memcpy(bssid, hdr->addr2, ETH_ALEN);
934  break;
935  case RTLLIB_FCTL_TODS:
936  memcpy(dst, hdr->addr3, ETH_ALEN);
937  memcpy(src, hdr->addr2, ETH_ALEN);
938  memcpy(bssid, hdr->addr1, ETH_ALEN);
939  break;
940  case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS:
941  memcpy(dst, hdr->addr3, ETH_ALEN);
942  memcpy(src, hdr->addr4, ETH_ALEN);
943  memcpy(bssid, ieee->current_network.bssid, ETH_ALEN);
944  break;
945  case 0:
946  memcpy(dst, hdr->addr1, ETH_ALEN);
947  memcpy(src, hdr->addr2, ETH_ALEN);
948  memcpy(bssid, hdr->addr3, ETH_ALEN);
949  break;
950  }
951 }
952 
953 static int rtllib_rx_data_filter(struct rtllib_device *ieee, u16 fc,
954  u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
955 {
956  u8 zero_addr[ETH_ALEN] = {0};
957  u8 type, stype;
958 
959  type = WLAN_FC_GET_TYPE(fc);
960  stype = WLAN_FC_GET_STYPE(fc);
961 
962  /* Filter frames from different BSS */
963  if (((fc & RTLLIB_FCTL_DSTODS) != RTLLIB_FCTL_DSTODS)
964  && (compare_ether_addr(ieee->current_network.bssid, bssid) != 0)
965  && memcmp(ieee->current_network.bssid, zero_addr, ETH_ALEN)) {
966  return -1;
967  }
968 
969  /* Filter packets sent by an STA that will be forwarded by AP */
970  if (ieee->IntelPromiscuousModeInfo.bPromiscuousOn &&
971  ieee->IntelPromiscuousModeInfo.bFilterSourceStationFrame) {
972  if ((fc & RTLLIB_FCTL_TODS) && !(fc & RTLLIB_FCTL_FROMDS) &&
973  (compare_ether_addr(dst, ieee->current_network.bssid) != 0) &&
974  (compare_ether_addr(bssid, ieee->current_network.bssid) == 0)) {
975  return -1;
976  }
977  }
978 
979  /* Nullfunc frames may have PS-bit set, so they must be passed to
980  * hostap_handle_sta_rx() before being dropped here. */
981  if (!ieee->IntelPromiscuousModeInfo.bPromiscuousOn) {
982  if (stype != RTLLIB_STYPE_DATA &&
983  stype != RTLLIB_STYPE_DATA_CFACK &&
984  stype != RTLLIB_STYPE_DATA_CFPOLL &&
985  stype != RTLLIB_STYPE_DATA_CFACKPOLL &&
986  stype != RTLLIB_STYPE_QOS_DATA) {
987  if (stype != RTLLIB_STYPE_NULLFUNC)
988  RTLLIB_DEBUG_DROP(
989  "RX: dropped data frame "
990  "with no data (type=0x%02x, "
991  "subtype=0x%02x)\n",
992  type, stype);
993  return -1;
994  }
995  }
996 
997  if (ieee->iw_mode != IW_MODE_MESH) {
998  /* packets from our adapter are dropped (echo) */
999  if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
1000  return -1;
1001 
1002  /* {broad,multi}cast packets to our BSS go through */
1003  if (is_multicast_ether_addr(dst)) {
1004  if (memcmp(bssid, ieee->current_network.bssid, ETH_ALEN))
1005  return -1;
1006  }
1007  }
1008  return 0;
1009 }
1010 
1011 static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
1012  struct lib80211_crypt_data **crypt, size_t hdrlen)
1013 {
1014  struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1015  u16 fc = le16_to_cpu(hdr->frame_ctl);
1016  int idx = 0;
1017 
1018  if (ieee->host_decrypt) {
1019  if (skb->len >= hdrlen + 3)
1020  idx = skb->data[hdrlen + 3] >> 6;
1021 
1022  *crypt = ieee->crypt_info.crypt[idx];
1023  /* allow NULL decrypt to indicate an station specific override
1024  * for default encryption */
1025  if (*crypt && ((*crypt)->ops == NULL ||
1026  (*crypt)->ops->decrypt_mpdu == NULL))
1027  *crypt = NULL;
1028 
1029  if (!*crypt && (fc & RTLLIB_FCTL_WEP)) {
1030  /* This seems to be triggered by some (multicast?)
1031  * frames from other than current BSS, so just drop the
1032  * frames silently instead of filling system log with
1033  * these reports. */
1034  RTLLIB_DEBUG_DROP("Decryption failed (not set)"
1035  " (SA= %pM)\n",
1036  hdr->addr2);
1037  ieee->ieee_stats.rx_discards_undecryptable++;
1038  return -1;
1039  }
1040  }
1041 
1042  return 0;
1043 }
1044 
1045 static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
1046  struct rtllib_rx_stats *rx_stats,
1047  struct lib80211_crypt_data *crypt, size_t hdrlen)
1048 {
1049  struct rtllib_hdr_4addr *hdr;
1050  int keyidx = 0;
1051  u16 fc, sc;
1052  u8 frag;
1053 
1054  hdr = (struct rtllib_hdr_4addr *)skb->data;
1055  fc = le16_to_cpu(hdr->frame_ctl);
1056  sc = le16_to_cpu(hdr->seq_ctl);
1057  frag = WLAN_GET_SEQ_FRAG(sc);
1058 
1059  if ((!rx_stats->Decrypted))
1060  ieee->need_sw_enc = 1;
1061  else
1062  ieee->need_sw_enc = 0;
1063 
1064  keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
1065  if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) && (keyidx < 0)) {
1066  printk(KERN_INFO "%s: decrypt frame error\n", __func__);
1067  return -1;
1068  }
1069 
1070  hdr = (struct rtllib_hdr_4addr *) skb->data;
1071  if ((frag != 0 || (fc & RTLLIB_FCTL_MOREFRAGS))) {
1072  int flen;
1073  struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
1074  RTLLIB_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
1075 
1076  if (!frag_skb) {
1077  RTLLIB_DEBUG(RTLLIB_DL_RX | RTLLIB_DL_FRAG,
1078  "Rx cannot get skb from fragment "
1079  "cache (morefrag=%d seq=%u frag=%u)\n",
1080  (fc & RTLLIB_FCTL_MOREFRAGS) != 0,
1081  WLAN_GET_SEQ_SEQ(sc), frag);
1082  return -1;
1083  }
1084  flen = skb->len;
1085  if (frag != 0)
1086  flen -= hdrlen;
1087 
1088  if (frag_skb->tail + flen > frag_skb->end) {
1089  printk(KERN_WARNING "%s: host decrypted and "
1090  "reassembled frame did not fit skb\n",
1091  __func__);
1092  rtllib_frag_cache_invalidate(ieee, hdr);
1093  return -1;
1094  }
1095 
1096  if (frag == 0) {
1097  /* copy first fragment (including full headers) into
1098  * beginning of the fragment cache skb */
1099  memcpy(skb_put(frag_skb, flen), skb->data, flen);
1100  } else {
1101  /* append frame payload to the end of the fragment
1102  * cache skb */
1103  memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
1104  flen);
1105  }
1106  dev_kfree_skb_any(skb);
1107  skb = NULL;
1108 
1109  if (fc & RTLLIB_FCTL_MOREFRAGS) {
1110  /* more fragments expected - leave the skb in fragment
1111  * cache for now; it will be delivered to upper layers
1112  * after all fragments have been received */
1113  return -2;
1114  }
1115 
1116  /* this was the last fragment and the frame will be
1117  * delivered, so remove skb from fragment cache */
1118  skb = frag_skb;
1119  hdr = (struct rtllib_hdr_4addr *) skb->data;
1120  rtllib_frag_cache_invalidate(ieee, hdr);
1121  }
1122 
1123  /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
1124  * encrypted/authenticated */
1125  if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) &&
1126  rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
1127  printk(KERN_INFO "%s: ==>decrypt msdu error\n", __func__);
1128  return -1;
1129  }
1130 
1131  hdr = (struct rtllib_hdr_4addr *) skb->data;
1132  if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep) {
1133  if (/*ieee->ieee802_1x &&*/
1134  rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1135 
1136  /* pass unencrypted EAPOL frames even if encryption is
1137  * configured */
1138  struct eapol *eap = (struct eapol *)(skb->data +
1139  24);
1140  RTLLIB_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
1141  eap_get_type(eap->type));
1142  } else {
1143  RTLLIB_DEBUG_DROP(
1144  "encryption configured, but RX "
1145  "frame not encrypted (SA= %pM)\n",
1146  hdr->addr2);
1147  return -1;
1148  }
1149  }
1150 
1151  if (crypt && !(fc & RTLLIB_FCTL_WEP) &&
1152  rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1153  struct eapol *eap = (struct eapol *)(skb->data +
1154  24);
1155  RTLLIB_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
1156  eap_get_type(eap->type));
1157  }
1158 
1159  if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep &&
1160  !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1161  RTLLIB_DEBUG_DROP(
1162  "dropped unencrypted RX data "
1163  "frame from %pM"
1164  " (drop_unencrypted=1)\n",
1165  hdr->addr2);
1166  return -1;
1167  }
1168 
1169  if (rtllib_is_eapol_frame(ieee, skb, hdrlen))
1170  printk(KERN_WARNING "RX: IEEE802.1X EAPOL frame!\n");
1171 
1172  return 0;
1173 }
1174 
1175 static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast, u8 nr_subframes)
1176 {
1177  if (unicast) {
1178 
1179  if ((ieee->state == RTLLIB_LINKED)) {
1180  if (((ieee->LinkDetectInfo.NumRxUnicastOkInPeriod +
1181  ieee->LinkDetectInfo.NumTxOkInPeriod) > 8) ||
1182  (ieee->LinkDetectInfo.NumRxUnicastOkInPeriod > 2)) {
1183  if (ieee->LeisurePSLeave)
1184  ieee->LeisurePSLeave(ieee->dev);
1185  }
1186  }
1187  }
1188  ieee->last_rx_ps_time = jiffies;
1189 }
1190 
1191 static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
1192  struct rtllib_rx_stats *rx_stats,
1193  struct rtllib_rxb *rxb,
1194  u8 *dst,
1195  u8 *src)
1196 {
1197  struct net_device *dev = ieee->dev;
1198  u16 ethertype;
1199  int i = 0;
1200 
1201  if (rxb == NULL) {
1202  printk(KERN_INFO "%s: rxb is NULL!!\n", __func__);
1203  return ;
1204  }
1205 
1206  for (i = 0; i < rxb->nr_subframes; i++) {
1207  struct sk_buff *sub_skb = rxb->subframes[i];
1208 
1209  if (sub_skb) {
1210  /* convert hdr + possible LLC headers into Ethernet header */
1211  ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
1212  if (sub_skb->len >= 8 &&
1213  ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
1214  ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1215  memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
1216  /* remove RFC1042 or Bridge-Tunnel encapsulation and
1217  * replace EtherType */
1218  skb_pull(sub_skb, SNAP_SIZE);
1219  memcpy(skb_push(sub_skb, ETH_ALEN), src, ETH_ALEN);
1220  memcpy(skb_push(sub_skb, ETH_ALEN), dst, ETH_ALEN);
1221  } else {
1222  u16 len;
1223  /* Leave Ethernet header part of hdr and full payload */
1224  len = htons(sub_skb->len);
1225  memcpy(skb_push(sub_skb, 2), &len, 2);
1226  memcpy(skb_push(sub_skb, ETH_ALEN), src, ETH_ALEN);
1227  memcpy(skb_push(sub_skb, ETH_ALEN), dst, ETH_ALEN);
1228  }
1229 
1230  ieee->stats.rx_packets++;
1231  ieee->stats.rx_bytes += sub_skb->len;
1232 
1233  if (is_multicast_ether_addr(dst))
1234  ieee->stats.multicast++;
1235 
1236  /* Indicate the packets to upper layer */
1237  memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
1238  sub_skb->protocol = eth_type_trans(sub_skb, dev);
1239  sub_skb->dev = dev;
1240  sub_skb->dev->stats.rx_packets++;
1241  sub_skb->dev->stats.rx_bytes += sub_skb->len;
1242  sub_skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
1243  netif_rx(sub_skb);
1244  }
1245  }
1246  kfree(rxb);
1247  rxb = NULL;
1248 }
1249 
1250 static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
1251  struct rtllib_rx_stats *rx_stats)
1252 {
1253  struct net_device *dev = ieee->dev;
1254  struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1255  struct lib80211_crypt_data *crypt = NULL;
1256  struct rtllib_rxb *rxb = NULL;
1257  struct rx_ts_record *pTS = NULL;
1258  u16 fc, sc, SeqNum = 0;
1259  u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
1260  u8 dst[ETH_ALEN], src[ETH_ALEN], bssid[ETH_ALEN] = {0}, *payload;
1261  size_t hdrlen = 0;
1262  bool bToOtherSTA = false;
1263  int ret = 0, i = 0;
1264 
1265  hdr = (struct rtllib_hdr_4addr *)skb->data;
1266  fc = le16_to_cpu(hdr->frame_ctl);
1267  type = WLAN_FC_GET_TYPE(fc);
1268  stype = WLAN_FC_GET_STYPE(fc);
1269  sc = le16_to_cpu(hdr->seq_ctl);
1270 
1271  /*Filter pkt not to me*/
1272  multicast = is_multicast_ether_addr(hdr->addr1);
1273  unicast = !multicast;
1274  if (unicast && (compare_ether_addr(dev->dev_addr, hdr->addr1) != 0)) {
1275  if (ieee->bNetPromiscuousMode)
1276  bToOtherSTA = true;
1277  else
1278  goto rx_dropped;
1279  }
1280 
1281  /*Filter pkt has too small length */
1282  hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
1283  if (skb->len < hdrlen) {
1284  printk(KERN_INFO "%s():ERR!!! skb->len is smaller than hdrlen\n", __func__);
1285  goto rx_dropped;
1286  }
1287 
1288  /* Filter Duplicate pkt */
1289  ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
1290  if (ret < 0)
1291  goto rx_dropped;
1292 
1293  /* Filter CTRL Frame */
1294  if (type == RTLLIB_FTYPE_CTL)
1295  goto rx_dropped;
1296 
1297  /* Filter MGNT Frame */
1298  if (type == RTLLIB_FTYPE_MGMT) {
1299  if (bToOtherSTA)
1300  goto rx_dropped;
1301  if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
1302  goto rx_dropped;
1303  else
1304  goto rx_exit;
1305  }
1306 
1307  /* Filter WAPI DATA Frame */
1308 
1309  /* Update statstics for AP roaming */
1310  if (!bToOtherSTA) {
1311  ieee->LinkDetectInfo.NumRecvDataInPeriod++;
1312  ieee->LinkDetectInfo.NumRxOkInPeriod++;
1313  }
1314  dev->last_rx = jiffies;
1315 
1316  /* Data frame - extract src/dst addresses */
1317  rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
1318 
1319  /* Filter Data frames */
1320  ret = rtllib_rx_data_filter(ieee, fc, dst, src, bssid, hdr->addr2);
1321  if (ret < 0)
1322  goto rx_dropped;
1323 
1324  if (skb->len == hdrlen)
1325  goto rx_dropped;
1326 
1327  /* Send pspoll based on moredata */
1328  if ((ieee->iw_mode == IW_MODE_INFRA) && (ieee->sta_sleep == LPS_IS_SLEEP)
1329  && (ieee->polling) && (!bToOtherSTA)) {
1330  if (WLAN_FC_MORE_DATA(fc)) {
1331  /* more data bit is set, let's request a new frame from the AP */
1332  rtllib_sta_ps_send_pspoll_frame(ieee);
1333  } else {
1334  ieee->polling = false;
1335  }
1336  }
1337 
1338  /* Get crypt if encrypted */
1339  ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
1340  if (ret == -1)
1341  goto rx_dropped;
1342 
1343  /* Decrypt data frame (including reassemble) */
1344  ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
1345  if (ret == -1)
1346  goto rx_dropped;
1347  else if (ret == -2)
1348  goto rx_exit;
1349 
1350  /* Get TS for Rx Reorder */
1351  hdr = (struct rtllib_hdr_4addr *) skb->data;
1352  if (ieee->current_network.qos_data.active && IsQoSDataFrame(skb->data)
1353  && !is_multicast_ether_addr(hdr->addr1)
1354  && (!bToOtherSTA)) {
1355  TID = Frame_QoSTID(skb->data);
1356  SeqNum = WLAN_GET_SEQ_SEQ(sc);
1357  GetTs(ieee, (struct ts_common_info **) &pTS, hdr->addr2, TID, RX_DIR, true);
1358  if (TID != 0 && TID != 3)
1359  ieee->bis_any_nonbepkts = true;
1360  }
1361 
1362  /* Parse rx data frame (For AMSDU) */
1363  /* skb: hdr + (possible reassembled) full plaintext payload */
1364  payload = skb->data + hdrlen;
1365  rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
1366  if (rxb == NULL) {
1367  RTLLIB_DEBUG(RTLLIB_DL_ERR,
1368  "%s(): kmalloc rxb error\n", __func__);
1369  goto rx_dropped;
1370  }
1371  /* to parse amsdu packets */
1372  /* qos data packets & reserved bit is 1 */
1373  if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
1374  /* only to free rxb, and not submit the packets to upper layer */
1375  for (i = 0; i < rxb->nr_subframes; i++)
1376  dev_kfree_skb(rxb->subframes[i]);
1377  kfree(rxb);
1378  rxb = NULL;
1379  goto rx_dropped;
1380  }
1381 
1382  /* Update WAPI PN */
1383 
1384  /* Check if leave LPS */
1385  if (!bToOtherSTA) {
1386  if (ieee->bIsAggregateFrame)
1387  nr_subframes = rxb->nr_subframes;
1388  else
1389  nr_subframes = 1;
1390  if (unicast)
1391  ieee->LinkDetectInfo.NumRxUnicastOkInPeriod += nr_subframes;
1392  rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
1393  }
1394 
1395  /* Indicate packets to upper layer or Rx Reorder */
1396  if (ieee->pHTInfo->bCurRxReorderEnable == false || pTS == NULL || bToOtherSTA)
1397  rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
1398  else
1399  RxReorderIndicatePacket(ieee, rxb, pTS, SeqNum);
1400 
1401  dev_kfree_skb(skb);
1402 
1403  rx_exit:
1404  return 1;
1405 
1406  rx_dropped:
1407  if (rxb != NULL) {
1408  kfree(rxb);
1409  rxb = NULL;
1410  }
1411  ieee->stats.rx_dropped++;
1412 
1413  /* Returning 0 indicates to caller that we have not handled the SKB--
1414  * so it is still allocated and can be used again by underlying
1415  * hardware as a DMA target */
1416  return 0;
1417 }
1418 
1419 static int rtllib_rx_Master(struct rtllib_device *ieee, struct sk_buff *skb,
1420  struct rtllib_rx_stats *rx_stats)
1421 {
1422  return 0;
1423 }
1424 
1425 static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
1426  struct rtllib_rx_stats *rx_stats)
1427 {
1428  struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1429  u16 fc = le16_to_cpu(hdr->frame_ctl);
1430  size_t hdrlen = rtllib_get_hdrlen(fc);
1431 
1432  if (skb->len < hdrlen) {
1433  printk(KERN_INFO "%s():ERR!!! skb->len is smaller than hdrlen\n", __func__);
1434  return 0;
1435  }
1436 
1437  if (HTCCheck(ieee, skb->data)) {
1438  if (net_ratelimit())
1439  printk(KERN_INFO "%s: Find HTCControl!\n", __func__);
1440  hdrlen += 4;
1441  }
1442 
1443  rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
1444  ieee->stats.rx_packets++;
1445  ieee->stats.rx_bytes += skb->len;
1446 
1447  return 1;
1448 }
1449 
1450 static int rtllib_rx_Mesh(struct rtllib_device *ieee, struct sk_buff *skb,
1451  struct rtllib_rx_stats *rx_stats)
1452 {
1453  return 0;
1454 }
1455 
1456 /* All received frames are sent to this function. @skb contains the frame in
1457  * IEEE 802.11 format, i.e., in the format it was sent over air.
1458  * This function is called only as a tasklet (software IRQ). */
1459 int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
1460  struct rtllib_rx_stats *rx_stats)
1461 {
1462  int ret = 0;
1463 
1464  if ((NULL == ieee) || (NULL == skb) || (NULL == rx_stats)) {
1465  printk(KERN_INFO "%s: Input parameters NULL!\n", __func__);
1466  goto rx_dropped;
1467  }
1468  if (skb->len < 10) {
1469  printk(KERN_INFO "%s: SKB length < 10\n", __func__);
1470  goto rx_dropped;
1471  }
1472 
1473  switch (ieee->iw_mode) {
1474  case IW_MODE_ADHOC:
1475  case IW_MODE_INFRA:
1476  ret = rtllib_rx_InfraAdhoc(ieee, skb, rx_stats);
1477  break;
1478  case IW_MODE_MASTER:
1479  case IW_MODE_REPEAT:
1480  ret = rtllib_rx_Master(ieee, skb, rx_stats);
1481  break;
1482  case IW_MODE_MONITOR:
1483  ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
1484  break;
1485  case IW_MODE_MESH:
1486  ret = rtllib_rx_Mesh(ieee, skb, rx_stats);
1487  break;
1488  default:
1489  printk(KERN_INFO"%s: ERR iw mode!!!\n", __func__);
1490  break;
1491  }
1492 
1493  return ret;
1494 
1495  rx_dropped:
1496  ieee->stats.rx_dropped++;
1497  return 0;
1498 }
1499 EXPORT_SYMBOL(rtllib_rx);
1500 
1501 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
1502 
1503 /*
1504 * Make ther structure we read from the beacon packet has
1505 * the right values
1506 */
1507 static int rtllib_verify_qos_info(struct rtllib_qos_information_element
1508  *info_element, int sub_type)
1509 {
1510 
1511  if (info_element->qui_subtype != sub_type)
1512  return -1;
1513  if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
1514  return -1;
1515  if (info_element->qui_type != QOS_OUI_TYPE)
1516  return -1;
1517  if (info_element->version != QOS_VERSION_1)
1518  return -1;
1519 
1520  return 0;
1521 }
1522 
1523 
1524 /*
1525  * Parse a QoS parameter element
1526  */
1527 static int rtllib_read_qos_param_element(struct rtllib_qos_parameter_info
1528  *element_param, struct rtllib_info_element
1529  *info_element)
1530 {
1531  int ret = 0;
1532  u16 size = sizeof(struct rtllib_qos_parameter_info) - 2;
1533 
1534  if ((info_element == NULL) || (element_param == NULL))
1535  return -1;
1536 
1537  if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
1538  memcpy(element_param->info_element.qui, info_element->data,
1539  info_element->len);
1540  element_param->info_element.elementID = info_element->id;
1541  element_param->info_element.length = info_element->len;
1542  } else
1543  ret = -1;
1544  if (ret == 0)
1545  ret = rtllib_verify_qos_info(&element_param->info_element,
1546  QOS_OUI_PARAM_SUB_TYPE);
1547  return ret;
1548 }
1549 
1550 /*
1551  * Parse a QoS information element
1552  */
1553 static int rtllib_read_qos_info_element(struct
1554  rtllib_qos_information_element
1555  *element_info, struct rtllib_info_element
1556  *info_element)
1557 {
1558  int ret = 0;
1559  u16 size = sizeof(struct rtllib_qos_information_element) - 2;
1560 
1561  if (element_info == NULL)
1562  return -1;
1563  if (info_element == NULL)
1564  return -1;
1565 
1566  if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
1567  memcpy(element_info->qui, info_element->data,
1568  info_element->len);
1569  element_info->elementID = info_element->id;
1570  element_info->length = info_element->len;
1571  } else
1572  ret = -1;
1573 
1574  if (ret == 0)
1575  ret = rtllib_verify_qos_info(element_info,
1576  QOS_OUI_INFO_SUB_TYPE);
1577  return ret;
1578 }
1579 
1580 
1581 /*
1582  * Write QoS parameters from the ac parameters.
1583  */
1584 static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
1585  struct rtllib_qos_data *qos_data)
1586 {
1587  struct rtllib_qos_ac_parameter *ac_params;
1588  struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
1589  int rc = 0;
1590  int i;
1591  u8 aci;
1592  u8 acm;
1593 
1594  qos_data->wmm_acm = 0;
1595  for (i = 0; i < QOS_QUEUE_NUM; i++) {
1596  ac_params = &(param_elm->ac_params_record[i]);
1597 
1598  aci = (ac_params->aci_aifsn & 0x60) >> 5;
1599  acm = (ac_params->aci_aifsn & 0x10) >> 4;
1600 
1601  if (aci >= QOS_QUEUE_NUM)
1602  continue;
1603  switch (aci) {
1604  case 1:
1605  /* BIT(0) | BIT(3) */
1606  if (acm)
1607  qos_data->wmm_acm |= (0x01<<0)|(0x01<<3);
1608  break;
1609  case 2:
1610  /* BIT(4) | BIT(5) */
1611  if (acm)
1612  qos_data->wmm_acm |= (0x01<<4)|(0x01<<5);
1613  break;
1614  case 3:
1615  /* BIT(6) | BIT(7) */
1616  if (acm)
1617  qos_data->wmm_acm |= (0x01<<6)|(0x01<<7);
1618  break;
1619  case 0:
1620  default:
1621  /* BIT(1) | BIT(2) */
1622  if (acm)
1623  qos_data->wmm_acm |= (0x01<<1)|(0x01<<2);
1624  break;
1625  }
1626 
1627  qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
1628 
1629  /* WMM spec P.11: The minimum value for AIFSN shall be 2 */
1630  qos_param->aifs[aci] = (qos_param->aifs[aci] < 2) ? 2 : qos_param->aifs[aci];
1631 
1632  qos_param->cw_min[aci] = ac_params->ecw_min_max & 0x0F;
1633 
1634  qos_param->cw_max[aci] = (ac_params->ecw_min_max & 0xF0) >> 4;
1635 
1636  qos_param->flag[aci] =
1637  (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1638  qos_param->tx_op_limit[aci] = le16_to_cpu(ac_params->tx_op_limit);
1639  }
1640  return rc;
1641 }
1642 
1643 /*
1644  * we have a generic data element which it may contain QoS information or
1645  * parameters element. check the information element length to decide
1646  * which type to read
1647  */
1648 static int rtllib_parse_qos_info_param_IE(struct rtllib_info_element
1649  *info_element,
1650  struct rtllib_network *network)
1651 {
1652  int rc = 0;
1653  struct rtllib_qos_information_element qos_info_element;
1654 
1655  rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
1656 
1657  if (rc == 0) {
1658  network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1659  network->flags |= NETWORK_HAS_QOS_INFORMATION;
1660  } else {
1661  struct rtllib_qos_parameter_info param_element;
1662 
1663  rc = rtllib_read_qos_param_element(&param_element,
1664  info_element);
1665  if (rc == 0) {
1666  rtllib_qos_convert_ac_to_parameters(&param_element,
1667  &(network->qos_data));
1668  network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1669  network->qos_data.param_count =
1670  param_element.info_element.ac_info & 0x0F;
1671  }
1672  }
1673 
1674  if (rc == 0) {
1675  RTLLIB_DEBUG_QOS("QoS is supported\n");
1676  network->qos_data.supported = 1;
1677  }
1678  return rc;
1679 }
1680 
1681 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1682 
1683 static const char *get_info_element_string(u16 id)
1684 {
1685  switch (id) {
1686  MFIE_STRING(SSID);
1687  MFIE_STRING(RATES);
1688  MFIE_STRING(FH_SET);
1689  MFIE_STRING(DS_SET);
1690  MFIE_STRING(CF_SET);
1691  MFIE_STRING(TIM);
1692  MFIE_STRING(IBSS_SET);
1693  MFIE_STRING(COUNTRY);
1694  MFIE_STRING(HOP_PARAMS);
1695  MFIE_STRING(HOP_TABLE);
1696  MFIE_STRING(REQUEST);
1697  MFIE_STRING(CHALLENGE);
1698  MFIE_STRING(POWER_CONSTRAINT);
1699  MFIE_STRING(POWER_CAPABILITY);
1700  MFIE_STRING(TPC_REQUEST);
1701  MFIE_STRING(TPC_REPORT);
1702  MFIE_STRING(SUPP_CHANNELS);
1703  MFIE_STRING(CSA);
1704  MFIE_STRING(MEASURE_REQUEST);
1705  MFIE_STRING(MEASURE_REPORT);
1706  MFIE_STRING(QUIET);
1707  MFIE_STRING(IBSS_DFS);
1708  MFIE_STRING(RSN);
1709  MFIE_STRING(RATES_EX);
1710  MFIE_STRING(GENERIC);
1711  MFIE_STRING(QOS_PARAMETER);
1712  default:
1713  return "UNKNOWN";
1714  }
1715 }
1716 
1717 static inline void rtllib_extract_country_ie(
1718  struct rtllib_device *ieee,
1719  struct rtllib_info_element *info_element,
1720  struct rtllib_network *network,
1721  u8 *addr2)
1722 {
1723  if (IS_DOT11D_ENABLE(ieee)) {
1724  if (info_element->len != 0) {
1725  memcpy(network->CountryIeBuf, info_element->data, info_element->len);
1726  network->CountryIeLen = info_element->len;
1727 
1728  if (!IS_COUNTRY_IE_VALID(ieee)) {
1729  if ((rtllib_act_scanning(ieee, false) == true) && (ieee->FirstIe_InScan == 1))
1730  printk(KERN_INFO "Received beacon ContryIE, SSID: <%s>\n", network->ssid);
1731  Dot11d_UpdateCountryIe(ieee, addr2, info_element->len, info_element->data);
1732  }
1733  }
1734 
1735  if (IS_EQUAL_CIE_SRC(ieee, addr2))
1736  UPDATE_CIE_WATCHDOG(ieee);
1737  }
1738 
1739 }
1740 
1741 int rtllib_parse_info_param(struct rtllib_device *ieee,
1742  struct rtllib_info_element *info_element,
1743  u16 length,
1744  struct rtllib_network *network,
1745  struct rtllib_rx_stats *stats)
1746 {
1747  u8 i;
1748  short offset;
1749  u16 tmp_htcap_len = 0;
1750  u16 tmp_htinfo_len = 0;
1751  u16 ht_realtek_agg_len = 0;
1752  u8 ht_realtek_agg_buf[MAX_IE_LEN];
1753  char rates_str[64];
1754  char *p;
1755 
1756  while (length >= sizeof(*info_element)) {
1757  if (sizeof(*info_element) + info_element->len > length) {
1758  RTLLIB_DEBUG_MGMT("Info elem: parse failed: "
1759  "info_element->len + 2 > left : "
1760  "info_element->len+2=%zd left=%d, id=%d.\n",
1761  info_element->len +
1762  sizeof(*info_element),
1763  length, info_element->id);
1764  /* We stop processing but don't return an error here
1765  * because some misbehaviour APs break this rule. ie.
1766  * Orinoco AP1000. */
1767  break;
1768  }
1769 
1770  switch (info_element->id) {
1771  case MFIE_TYPE_SSID:
1772  if (rtllib_is_empty_essid(info_element->data,
1773  info_element->len)) {
1774  network->flags |= NETWORK_EMPTY_ESSID;
1775  break;
1776  }
1777 
1778  network->ssid_len = min(info_element->len,
1779  (u8) IW_ESSID_MAX_SIZE);
1780  memcpy(network->ssid, info_element->data, network->ssid_len);
1781  if (network->ssid_len < IW_ESSID_MAX_SIZE)
1782  memset(network->ssid + network->ssid_len, 0,
1783  IW_ESSID_MAX_SIZE - network->ssid_len);
1784 
1785  RTLLIB_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1786  network->ssid, network->ssid_len);
1787  break;
1788 
1789  case MFIE_TYPE_RATES:
1790  p = rates_str;
1791  network->rates_len = min(info_element->len,
1792  MAX_RATES_LENGTH);
1793  for (i = 0; i < network->rates_len; i++) {
1794  network->rates[i] = info_element->data[i];
1795  p += snprintf(p, sizeof(rates_str) -
1796  (p - rates_str), "%02X ",
1797  network->rates[i]);
1798  if (rtllib_is_ofdm_rate
1799  (info_element->data[i])) {
1800  network->flags |= NETWORK_HAS_OFDM;
1801  if (info_element->data[i] &
1802  RTLLIB_BASIC_RATE_MASK)
1803  network->flags &=
1804  ~NETWORK_HAS_CCK;
1805  }
1806 
1807  if (rtllib_is_cck_rate
1808  (info_element->data[i])) {
1809  network->flags |= NETWORK_HAS_CCK;
1810  }
1811  }
1812 
1813  RTLLIB_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1814  rates_str, network->rates_len);
1815  break;
1816 
1817  case MFIE_TYPE_RATES_EX:
1818  p = rates_str;
1819  network->rates_ex_len = min(info_element->len,
1820  MAX_RATES_EX_LENGTH);
1821  for (i = 0; i < network->rates_ex_len; i++) {
1822  network->rates_ex[i] = info_element->data[i];
1823  p += snprintf(p, sizeof(rates_str) -
1824  (p - rates_str), "%02X ",
1825  network->rates[i]);
1826  if (rtllib_is_ofdm_rate
1827  (info_element->data[i])) {
1828  network->flags |= NETWORK_HAS_OFDM;
1829  if (info_element->data[i] &
1830  RTLLIB_BASIC_RATE_MASK)
1831  network->flags &=
1832  ~NETWORK_HAS_CCK;
1833  }
1834  }
1835 
1836  RTLLIB_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1837  rates_str, network->rates_ex_len);
1838  break;
1839 
1840  case MFIE_TYPE_DS_SET:
1841  RTLLIB_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1842  info_element->data[0]);
1843  network->channel = info_element->data[0];
1844  break;
1845 
1846  case MFIE_TYPE_FH_SET:
1847  RTLLIB_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1848  break;
1849 
1850  case MFIE_TYPE_CF_SET:
1851  RTLLIB_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1852  break;
1853 
1854  case MFIE_TYPE_TIM:
1855  if (info_element->len < 4)
1856  break;
1857 
1858  network->tim.tim_count = info_element->data[0];
1859  network->tim.tim_period = info_element->data[1];
1860 
1861  network->dtim_period = info_element->data[1];
1862  if (ieee->state != RTLLIB_LINKED)
1863  break;
1864  network->last_dtim_sta_time = jiffies;
1865 
1866  network->dtim_data = RTLLIB_DTIM_VALID;
1867 
1868 
1869  if (info_element->data[2] & 1)
1870  network->dtim_data |= RTLLIB_DTIM_MBCAST;
1871 
1872  offset = (info_element->data[2] >> 1)*2;
1873 
1874 
1875  if (ieee->assoc_id < 8*offset ||
1876  ieee->assoc_id > 8*(offset + info_element->len - 3))
1877  break;
1878 
1879  offset = (ieee->assoc_id / 8) - offset;
1880  if (info_element->data[3 + offset] &
1881  (1 << (ieee->assoc_id % 8)))
1882  network->dtim_data |= RTLLIB_DTIM_UCAST;
1883 
1884  network->listen_interval = network->dtim_period;
1885  break;
1886 
1887  case MFIE_TYPE_ERP:
1888  network->erp_value = info_element->data[0];
1889  network->flags |= NETWORK_HAS_ERP_VALUE;
1890  RTLLIB_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1891  network->erp_value);
1892  break;
1893  case MFIE_TYPE_IBSS_SET:
1894  network->atim_window = info_element->data[0];
1895  RTLLIB_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1896  network->atim_window);
1897  break;
1898 
1899  case MFIE_TYPE_CHALLENGE:
1900  RTLLIB_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1901  break;
1902 
1903  case MFIE_TYPE_GENERIC:
1904  RTLLIB_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1905  info_element->len);
1906  if (!rtllib_parse_qos_info_param_IE(info_element,
1907  network))
1908  break;
1909  if (info_element->len >= 4 &&
1910  info_element->data[0] == 0x00 &&
1911  info_element->data[1] == 0x50 &&
1912  info_element->data[2] == 0xf2 &&
1913  info_element->data[3] == 0x01) {
1914  network->wpa_ie_len = min(info_element->len + 2,
1915  MAX_WPA_IE_LEN);
1916  memcpy(network->wpa_ie, info_element,
1917  network->wpa_ie_len);
1918  break;
1919  }
1920  if (info_element->len == 7 &&
1921  info_element->data[0] == 0x00 &&
1922  info_element->data[1] == 0xe0 &&
1923  info_element->data[2] == 0x4c &&
1924  info_element->data[3] == 0x01 &&
1925  info_element->data[4] == 0x02)
1926  network->Turbo_Enable = 1;
1927 
1928  if (tmp_htcap_len == 0) {
1929  if (info_element->len >= 4 &&
1930  info_element->data[0] == 0x00 &&
1931  info_element->data[1] == 0x90 &&
1932  info_element->data[2] == 0x4c &&
1933  info_element->data[3] == 0x033) {
1934 
1935  tmp_htcap_len = min(info_element->len, (u8)MAX_IE_LEN);
1936  if (tmp_htcap_len != 0) {
1937  network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
1938  network->bssht.bdHTCapLen = tmp_htcap_len > sizeof(network->bssht.bdHTCapBuf) ?
1939  sizeof(network->bssht.bdHTCapBuf) : tmp_htcap_len;
1940  memcpy(network->bssht.bdHTCapBuf, info_element->data, network->bssht.bdHTCapLen);
1941  }
1942  }
1943  if (tmp_htcap_len != 0) {
1944  network->bssht.bdSupportHT = true;
1945  network->bssht.bdHT1R = ((((struct ht_capab_ele *)(network->bssht.bdHTCapBuf))->MCS[1]) == 0);
1946  } else {
1947  network->bssht.bdSupportHT = false;
1948  network->bssht.bdHT1R = false;
1949  }
1950  }
1951 
1952 
1953  if (tmp_htinfo_len == 0) {
1954  if (info_element->len >= 4 &&
1955  info_element->data[0] == 0x00 &&
1956  info_element->data[1] == 0x90 &&
1957  info_element->data[2] == 0x4c &&
1958  info_element->data[3] == 0x034) {
1959  tmp_htinfo_len = min(info_element->len, (u8)MAX_IE_LEN);
1960  if (tmp_htinfo_len != 0) {
1961  network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
1962  if (tmp_htinfo_len) {
1963  network->bssht.bdHTInfoLen = tmp_htinfo_len > sizeof(network->bssht.bdHTInfoBuf) ?
1964  sizeof(network->bssht.bdHTInfoBuf) : tmp_htinfo_len;
1965  memcpy(network->bssht.bdHTInfoBuf, info_element->data, network->bssht.bdHTInfoLen);
1966  }
1967 
1968  }
1969 
1970  }
1971  }
1972 
1973  if (ieee->aggregation) {
1974  if (network->bssht.bdSupportHT) {
1975  if (info_element->len >= 4 &&
1976  info_element->data[0] == 0x00 &&
1977  info_element->data[1] == 0xe0 &&
1978  info_element->data[2] == 0x4c &&
1979  info_element->data[3] == 0x02) {
1980  ht_realtek_agg_len = min(info_element->len, (u8)MAX_IE_LEN);
1981  memcpy(ht_realtek_agg_buf, info_element->data, info_element->len);
1982  }
1983  if (ht_realtek_agg_len >= 5) {
1984  network->realtek_cap_exit = true;
1985  network->bssht.bdRT2RTAggregation = true;
1986 
1987  if ((ht_realtek_agg_buf[4] == 1) && (ht_realtek_agg_buf[5] & 0x02))
1988  network->bssht.bdRT2RTLongSlotTime = true;
1989 
1990  if ((ht_realtek_agg_buf[4] == 1) && (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
1991  network->bssht.RT2RT_HT_Mode |= RT_HT_CAP_USE_92SE;
1992  }
1993  }
1994  if (ht_realtek_agg_len >= 5) {
1995  if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
1996  network->bssht.RT2RT_HT_Mode |= RT_HT_CAP_USE_SOFTAP;
1997  }
1998  }
1999 
2000  if ((info_element->len >= 3 &&
2001  info_element->data[0] == 0x00 &&
2002  info_element->data[1] == 0x05 &&
2003  info_element->data[2] == 0xb5) ||
2004  (info_element->len >= 3 &&
2005  info_element->data[0] == 0x00 &&
2006  info_element->data[1] == 0x0a &&
2007  info_element->data[2] == 0xf7) ||
2008  (info_element->len >= 3 &&
2009  info_element->data[0] == 0x00 &&
2010  info_element->data[1] == 0x10 &&
2011  info_element->data[2] == 0x18)) {
2012  network->broadcom_cap_exist = true;
2013  }
2014  if (info_element->len >= 3 &&
2015  info_element->data[0] == 0x00 &&
2016  info_element->data[1] == 0x0c &&
2017  info_element->data[2] == 0x43)
2018  network->ralink_cap_exist = true;
2019  if ((info_element->len >= 3 &&
2020  info_element->data[0] == 0x00 &&
2021  info_element->data[1] == 0x03 &&
2022  info_element->data[2] == 0x7f) ||
2023  (info_element->len >= 3 &&
2024  info_element->data[0] == 0x00 &&
2025  info_element->data[1] == 0x13 &&
2026  info_element->data[2] == 0x74))
2027  network->atheros_cap_exist = true;
2028 
2029  if ((info_element->len >= 3 &&
2030  info_element->data[0] == 0x00 &&
2031  info_element->data[1] == 0x50 &&
2032  info_element->data[2] == 0x43))
2033  network->marvell_cap_exist = true;
2034  if (info_element->len >= 3 &&
2035  info_element->data[0] == 0x00 &&
2036  info_element->data[1] == 0x40 &&
2037  info_element->data[2] == 0x96)
2038  network->cisco_cap_exist = true;
2039 
2040 
2041  if (info_element->len >= 3 &&
2042  info_element->data[0] == 0x00 &&
2043  info_element->data[1] == 0x0a &&
2044  info_element->data[2] == 0xf5)
2045  network->airgo_cap_exist = true;
2046 
2047  if (info_element->len > 4 &&
2048  info_element->data[0] == 0x00 &&
2049  info_element->data[1] == 0x40 &&
2050  info_element->data[2] == 0x96 &&
2051  info_element->data[3] == 0x01) {
2052  if (info_element->len == 6) {
2053  memcpy(network->CcxRmState, &info_element[4], 2);
2054  if (network->CcxRmState[0] != 0)
2055  network->bCcxRmEnable = true;
2056  else
2057  network->bCcxRmEnable = false;
2058  network->MBssidMask = network->CcxRmState[1] & 0x07;
2059  if (network->MBssidMask != 0) {
2060  network->bMBssidValid = true;
2061  network->MBssidMask = 0xff << (network->MBssidMask);
2062  memcpy(network->MBssid, network->bssid, ETH_ALEN);
2063  network->MBssid[5] &= network->MBssidMask;
2064  } else {
2065  network->bMBssidValid = false;
2066  }
2067  } else {
2068  network->bCcxRmEnable = false;
2069  }
2070  }
2071  if (info_element->len > 4 &&
2072  info_element->data[0] == 0x00 &&
2073  info_element->data[1] == 0x40 &&
2074  info_element->data[2] == 0x96 &&
2075  info_element->data[3] == 0x03) {
2076  if (info_element->len == 5) {
2077  network->bWithCcxVerNum = true;
2078  network->BssCcxVerNumber = info_element->data[4];
2079  } else {
2080  network->bWithCcxVerNum = false;
2081  network->BssCcxVerNumber = 0;
2082  }
2083  }
2084  if (info_element->len > 4 &&
2085  info_element->data[0] == 0x00 &&
2086  info_element->data[1] == 0x50 &&
2087  info_element->data[2] == 0xf2 &&
2088  info_element->data[3] == 0x04) {
2089  RTLLIB_DEBUG_MGMT("MFIE_TYPE_WZC: %d bytes\n",
2090  info_element->len);
2091  network->wzc_ie_len = min(info_element->len+2,
2092  MAX_WZC_IE_LEN);
2093  memcpy(network->wzc_ie, info_element,
2094  network->wzc_ie_len);
2095  }
2096  break;
2097 
2098  case MFIE_TYPE_RSN:
2099  RTLLIB_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
2100  info_element->len);
2101  network->rsn_ie_len = min(info_element->len + 2,
2102  MAX_WPA_IE_LEN);
2103  memcpy(network->rsn_ie, info_element,
2104  network->rsn_ie_len);
2105  break;
2106 
2107  case MFIE_TYPE_HT_CAP:
2108  RTLLIB_DEBUG_SCAN("MFIE_TYPE_HT_CAP: %d bytes\n",
2109  info_element->len);
2110  tmp_htcap_len = min(info_element->len, (u8)MAX_IE_LEN);
2111  if (tmp_htcap_len != 0) {
2112  network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
2113  network->bssht.bdHTCapLen = tmp_htcap_len > sizeof(network->bssht.bdHTCapBuf) ?
2114  sizeof(network->bssht.bdHTCapBuf) : tmp_htcap_len;
2115  memcpy(network->bssht.bdHTCapBuf,
2116  info_element->data,
2117  network->bssht.bdHTCapLen);
2118 
2119  network->bssht.bdSupportHT = true;
2120  network->bssht.bdHT1R = ((((struct ht_capab_ele *)
2121  network->bssht.bdHTCapBuf))->MCS[1]) == 0;
2122 
2123  network->bssht.bdBandWidth = (enum ht_channel_width)
2124  (((struct ht_capab_ele *)
2125  (network->bssht.bdHTCapBuf))->ChlWidth);
2126  } else {
2127  network->bssht.bdSupportHT = false;
2128  network->bssht.bdHT1R = false;
2129  network->bssht.bdBandWidth = HT_CHANNEL_WIDTH_20;
2130  }
2131  break;
2132 
2133 
2134  case MFIE_TYPE_HT_INFO:
2135  RTLLIB_DEBUG_SCAN("MFIE_TYPE_HT_INFO: %d bytes\n",
2136  info_element->len);
2137  tmp_htinfo_len = min(info_element->len, (u8)MAX_IE_LEN);
2138  if (tmp_htinfo_len) {
2139  network->bssht.bdHTSpecVer = HT_SPEC_VER_IEEE;
2140  network->bssht.bdHTInfoLen = tmp_htinfo_len >
2141  sizeof(network->bssht.bdHTInfoBuf) ?
2142  sizeof(network->bssht.bdHTInfoBuf) :
2143  tmp_htinfo_len;
2144  memcpy(network->bssht.bdHTInfoBuf,
2145  info_element->data,
2146  network->bssht.bdHTInfoLen);
2147  }
2148  break;
2149 
2150  case MFIE_TYPE_AIRONET:
2151  RTLLIB_DEBUG_SCAN("MFIE_TYPE_AIRONET: %d bytes\n",
2152  info_element->len);
2153  if (info_element->len > IE_CISCO_FLAG_POSITION) {
2154  network->bWithAironetIE = true;
2155 
2156  if ((info_element->data[IE_CISCO_FLAG_POSITION]
2157  & SUPPORT_CKIP_MIC) ||
2158  (info_element->data[IE_CISCO_FLAG_POSITION]
2159  & SUPPORT_CKIP_PK))
2160  network->bCkipSupported = true;
2161  else
2162  network->bCkipSupported = false;
2163  } else {
2164  network->bWithAironetIE = false;
2165  network->bCkipSupported = false;
2166  }
2167  break;
2168  case MFIE_TYPE_QOS_PARAMETER:
2169  printk(KERN_ERR
2170  "QoS Error need to parse QOS_PARAMETER IE\n");
2171  break;
2172 
2173  case MFIE_TYPE_COUNTRY:
2174  RTLLIB_DEBUG_SCAN("MFIE_TYPE_COUNTRY: %d bytes\n",
2175  info_element->len);
2176  rtllib_extract_country_ie(ieee, info_element, network,
2177  network->bssid);
2178  break;
2179 /* TODO */
2180  default:
2181  RTLLIB_DEBUG_MGMT
2182  ("Unsupported info element: %s (%d)\n",
2183  get_info_element_string(info_element->id),
2184  info_element->id);
2185  break;
2186  }
2187 
2188  length -= sizeof(*info_element) + info_element->len;
2189  info_element =
2190  (struct rtllib_info_element *)&info_element->
2191  data[info_element->len];
2192  }
2193 
2194  if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
2195  !network->cisco_cap_exist && !network->ralink_cap_exist &&
2196  !network->bssht.bdRT2RTAggregation)
2197  network->unknown_cap_exist = true;
2198  else
2199  network->unknown_cap_exist = false;
2200  return 0;
2201 }
2202 
2203 static inline u8 rtllib_SignalStrengthTranslate(u8 CurrSS)
2204 {
2205  u8 RetSS;
2206 
2207  if (CurrSS >= 71 && CurrSS <= 100)
2208  RetSS = 90 + ((CurrSS - 70) / 3);
2209  else if (CurrSS >= 41 && CurrSS <= 70)
2210  RetSS = 78 + ((CurrSS - 40) / 3);
2211  else if (CurrSS >= 31 && CurrSS <= 40)
2212  RetSS = 66 + (CurrSS - 30);
2213  else if (CurrSS >= 21 && CurrSS <= 30)
2214  RetSS = 54 + (CurrSS - 20);
2215  else if (CurrSS >= 5 && CurrSS <= 20)
2216  RetSS = 42 + (((CurrSS - 5) * 2) / 3);
2217  else if (CurrSS == 4)
2218  RetSS = 36;
2219  else if (CurrSS == 3)
2220  RetSS = 27;
2221  else if (CurrSS == 2)
2222  RetSS = 18;
2223  else if (CurrSS == 1)
2224  RetSS = 9;
2225  else
2226  RetSS = CurrSS;
2227 
2228  return RetSS;
2229 }
2230 
2231 static long rtllib_translate_todbm(u8 signal_strength_index)
2232 {
2233  long signal_power;
2234 
2235  signal_power = (long)((signal_strength_index + 1) >> 1);
2236  signal_power -= 95;
2237 
2238  return signal_power;
2239 }
2240 
2241 static inline int rtllib_network_init(
2242  struct rtllib_device *ieee,
2243  struct rtllib_probe_response *beacon,
2244  struct rtllib_network *network,
2245  struct rtllib_rx_stats *stats)
2246 {
2247 
2248  /*
2249  network->qos_data.active = 0;
2250  network->qos_data.supported = 0;
2251  network->qos_data.param_count = 0;
2252  network->qos_data.old_param_count = 0;
2253  */
2254  memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
2255 
2256  /* Pull out fixed field data */
2257  memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
2258  network->capability = le16_to_cpu(beacon->capability);
2259  network->last_scanned = jiffies;
2260  network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
2261  network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
2262  network->beacon_interval = le32_to_cpu(beacon->beacon_interval);
2263  /* Where to pull this? beacon->listen_interval;*/
2264  network->listen_interval = 0x0A;
2265  network->rates_len = network->rates_ex_len = 0;
2266  network->last_associate = 0;
2267  network->ssid_len = 0;
2268  network->hidden_ssid_len = 0;
2269  memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
2270  network->flags = 0;
2271  network->atim_window = 0;
2272  network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
2273  0x3 : 0x0;
2274  network->berp_info_valid = false;
2275  network->broadcom_cap_exist = false;
2276  network->ralink_cap_exist = false;
2277  network->atheros_cap_exist = false;
2278  network->cisco_cap_exist = false;
2279  network->unknown_cap_exist = false;
2280  network->realtek_cap_exit = false;
2281  network->marvell_cap_exist = false;
2282  network->airgo_cap_exist = false;
2283  network->Turbo_Enable = 0;
2284  network->SignalStrength = stats->SignalStrength;
2285  network->RSSI = stats->SignalStrength;
2286  network->CountryIeLen = 0;
2287  memset(network->CountryIeBuf, 0, MAX_IE_LEN);
2288  HTInitializeBssDesc(&network->bssht);
2289  if (stats->freq == RTLLIB_52GHZ_BAND) {
2290  /* for A band (No DS info) */
2291  network->channel = stats->received_channel;
2292  } else
2293  network->flags |= NETWORK_HAS_CCK;
2294 
2295  network->wpa_ie_len = 0;
2296  network->rsn_ie_len = 0;
2297  network->wzc_ie_len = 0;
2298 
2299  if (rtllib_parse_info_param(ieee,
2300  beacon->info_element,
2301  (stats->len - sizeof(*beacon)),
2302  network,
2303  stats))
2304  return 1;
2305 
2306  network->mode = 0;
2307  if (stats->freq == RTLLIB_52GHZ_BAND)
2308  network->mode = IEEE_A;
2309  else {
2310  if (network->flags & NETWORK_HAS_OFDM)
2311  network->mode |= IEEE_G;
2312  if (network->flags & NETWORK_HAS_CCK)
2313  network->mode |= IEEE_B;
2314  }
2315 
2316  if (network->mode == 0) {
2317  RTLLIB_DEBUG_SCAN("Filtered out '%s (%pM)' "
2318  "network.\n",
2319  escape_essid(network->ssid,
2320  network->ssid_len),
2321  network->bssid);
2322  return 1;
2323  }
2324 
2325  if (network->bssht.bdSupportHT) {
2326  if (network->mode == IEEE_A)
2327  network->mode = IEEE_N_5G;
2328  else if (network->mode & (IEEE_G | IEEE_B))
2329  network->mode = IEEE_N_24G;
2330  }
2331  if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
2332  network->flags |= NETWORK_EMPTY_ESSID;
2333  stats->signal = 30 + (stats->SignalStrength * 70) / 100;
2334  stats->noise = rtllib_translate_todbm((u8)(100-stats->signal)) - 25;
2335 
2336  memcpy(&network->stats, stats, sizeof(network->stats));
2337 
2338  return 0;
2339 }
2340 
2341 static inline int is_same_network(struct rtllib_network *src,
2342  struct rtllib_network *dst, u8 ssidbroad)
2343 {
2344  /* A network is only a duplicate if the channel, BSSID, ESSID
2345  * and the capability field (in particular IBSS and BSS) all match.
2346  * We treat all <hidden> with the same BSSID and channel
2347  * as one network */
2348  return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
2349  (src->channel == dst->channel) &&
2350  !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
2351  (!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
2352  (!ssidbroad)) &&
2353  ((src->capability & WLAN_CAPABILITY_IBSS) ==
2354  (dst->capability & WLAN_CAPABILITY_IBSS)) &&
2355  ((src->capability & WLAN_CAPABILITY_ESS) ==
2356  (dst->capability & WLAN_CAPABILITY_ESS)));
2357 }
2358 
2359 static inline void update_ibss_network(struct rtllib_network *dst,
2360  struct rtllib_network *src)
2361 {
2362  memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2363  dst->last_scanned = jiffies;
2364 }
2365 
2366 
2367 static inline void update_network(struct rtllib_network *dst,
2368  struct rtllib_network *src)
2369 {
2370  int qos_active;
2371  u8 old_param;
2372 
2373  memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2374  dst->capability = src->capability;
2375  memcpy(dst->rates, src->rates, src->rates_len);
2376  dst->rates_len = src->rates_len;
2377  memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
2378  dst->rates_ex_len = src->rates_ex_len;
2379  if (src->ssid_len > 0) {
2380  if (dst->ssid_len == 0) {
2381  memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
2382  dst->hidden_ssid_len = src->ssid_len;
2383  memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
2384  } else {
2385  memset(dst->ssid, 0, dst->ssid_len);
2386  dst->ssid_len = src->ssid_len;
2387  memcpy(dst->ssid, src->ssid, src->ssid_len);
2388  }
2389  }
2390  dst->mode = src->mode;
2391  dst->flags = src->flags;
2392  dst->time_stamp[0] = src->time_stamp[0];
2393  dst->time_stamp[1] = src->time_stamp[1];
2394  if (src->flags & NETWORK_HAS_ERP_VALUE) {
2395  dst->erp_value = src->erp_value;
2396  dst->berp_info_valid = src->berp_info_valid = true;
2397  }
2398  dst->beacon_interval = src->beacon_interval;
2399  dst->listen_interval = src->listen_interval;
2400  dst->atim_window = src->atim_window;
2401  dst->dtim_period = src->dtim_period;
2402  dst->dtim_data = src->dtim_data;
2403  dst->last_dtim_sta_time = src->last_dtim_sta_time;
2404  memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
2405 
2406  dst->bssht.bdSupportHT = src->bssht.bdSupportHT;
2407  dst->bssht.bdRT2RTAggregation = src->bssht.bdRT2RTAggregation;
2408  dst->bssht.bdHTCapLen = src->bssht.bdHTCapLen;
2409  memcpy(dst->bssht.bdHTCapBuf, src->bssht.bdHTCapBuf,
2410  src->bssht.bdHTCapLen);
2411  dst->bssht.bdHTInfoLen = src->bssht.bdHTInfoLen;
2412  memcpy(dst->bssht.bdHTInfoBuf, src->bssht.bdHTInfoBuf,
2413  src->bssht.bdHTInfoLen);
2414  dst->bssht.bdHTSpecVer = src->bssht.bdHTSpecVer;
2415  dst->bssht.bdRT2RTLongSlotTime = src->bssht.bdRT2RTLongSlotTime;
2416  dst->broadcom_cap_exist = src->broadcom_cap_exist;
2417  dst->ralink_cap_exist = src->ralink_cap_exist;
2418  dst->atheros_cap_exist = src->atheros_cap_exist;
2419  dst->realtek_cap_exit = src->realtek_cap_exit;
2420  dst->marvell_cap_exist = src->marvell_cap_exist;
2421  dst->cisco_cap_exist = src->cisco_cap_exist;
2422  dst->airgo_cap_exist = src->airgo_cap_exist;
2423  dst->unknown_cap_exist = src->unknown_cap_exist;
2424  memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
2425  dst->wpa_ie_len = src->wpa_ie_len;
2426  memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
2427  dst->rsn_ie_len = src->rsn_ie_len;
2428  memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
2429  dst->wzc_ie_len = src->wzc_ie_len;
2430 
2431  dst->last_scanned = jiffies;
2432  /* qos related parameters */
2433  qos_active = dst->qos_data.active;
2434  old_param = dst->qos_data.param_count;
2435  dst->qos_data.supported = src->qos_data.supported;
2436  if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
2437  memcpy(&dst->qos_data, &src->qos_data,
2438  sizeof(struct rtllib_qos_data));
2439  if (dst->qos_data.supported == 1) {
2440  if (dst->ssid_len)
2441  RTLLIB_DEBUG_QOS
2442  ("QoS the network %s is QoS supported\n",
2443  dst->ssid);
2444  else
2445  RTLLIB_DEBUG_QOS
2446  ("QoS the network is QoS supported\n");
2447  }
2448  dst->qos_data.active = qos_active;
2449  dst->qos_data.old_param_count = old_param;
2450 
2451  /* dst->last_associate is not overwritten */
2452  dst->wmm_info = src->wmm_info;
2453  if (src->wmm_param[0].ac_aci_acm_aifsn ||
2454  src->wmm_param[1].ac_aci_acm_aifsn ||
2455  src->wmm_param[2].ac_aci_acm_aifsn ||
2456  src->wmm_param[3].ac_aci_acm_aifsn)
2457  memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
2458 
2459  dst->SignalStrength = src->SignalStrength;
2460  dst->RSSI = src->RSSI;
2461  dst->Turbo_Enable = src->Turbo_Enable;
2462 
2463  dst->CountryIeLen = src->CountryIeLen;
2464  memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
2465 
2466  dst->bWithAironetIE = src->bWithAironetIE;
2467  dst->bCkipSupported = src->bCkipSupported;
2468  memcpy(dst->CcxRmState, src->CcxRmState, 2);
2469  dst->bCcxRmEnable = src->bCcxRmEnable;
2470  dst->MBssidMask = src->MBssidMask;
2471  dst->bMBssidValid = src->bMBssidValid;
2472  memcpy(dst->MBssid, src->MBssid, 6);
2473  dst->bWithCcxVerNum = src->bWithCcxVerNum;
2474  dst->BssCcxVerNumber = src->BssCcxVerNumber;
2475 }
2476 
2477 static inline int is_beacon(__le16 fc)
2478 {
2479  return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == RTLLIB_STYPE_BEACON);
2480 }
2481 
2482 static int IsPassiveChannel(struct rtllib_device *rtllib, u8 channel)
2483 {
2484  if (MAX_CHANNEL_NUMBER < channel) {
2485  printk(KERN_INFO "%s(): Invalid Channel\n", __func__);
2486  return 0;
2487  }
2488 
2489  if (rtllib->active_channel_map[channel] == 2)
2490  return 1;
2491 
2492  return 0;
2493 }
2494 
2495 int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
2496 {
2497  if (MAX_CHANNEL_NUMBER < channel) {
2498  printk(KERN_INFO "%s(): Invalid Channel\n", __func__);
2499  return 0;
2500  }
2501  if (rtllib->active_channel_map[channel] > 0)
2502  return 1;
2503 
2504  return 0;
2505 }
2506 EXPORT_SYMBOL(rtllib_legal_channel);
2507 
2508 static inline void rtllib_process_probe_response(
2509  struct rtllib_device *ieee,
2510  struct rtllib_probe_response *beacon,
2511  struct rtllib_rx_stats *stats)
2512 {
2513  struct rtllib_network *target;
2514  struct rtllib_network *oldest = NULL;
2515  struct rtllib_info_element *info_element = &beacon->info_element[0];
2516  unsigned long flags;
2517  short renew;
2518  struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
2519  GFP_ATOMIC);
2520 
2521  if (!network)
2522  return;
2523 
2524  RTLLIB_DEBUG_SCAN(
2525  "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
2526  escape_essid(info_element->data, info_element->len),
2527  beacon->header.addr3,
2528  (beacon->capability & (1<<0xf)) ? '1' : '0',
2529  (beacon->capability & (1<<0xe)) ? '1' : '0',
2530  (beacon->capability & (1<<0xd)) ? '1' : '0',
2531  (beacon->capability & (1<<0xc)) ? '1' : '0',
2532  (beacon->capability & (1<<0xb)) ? '1' : '0',
2533  (beacon->capability & (1<<0xa)) ? '1' : '0',
2534  (beacon->capability & (1<<0x9)) ? '1' : '0',
2535  (beacon->capability & (1<<0x8)) ? '1' : '0',
2536  (beacon->capability & (1<<0x7)) ? '1' : '0',
2537  (beacon->capability & (1<<0x6)) ? '1' : '0',
2538  (beacon->capability & (1<<0x5)) ? '1' : '0',
2539  (beacon->capability & (1<<0x4)) ? '1' : '0',
2540  (beacon->capability & (1<<0x3)) ? '1' : '0',
2541  (beacon->capability & (1<<0x2)) ? '1' : '0',
2542  (beacon->capability & (1<<0x1)) ? '1' : '0',
2543  (beacon->capability & (1<<0x0)) ? '1' : '0');
2544 
2545  if (rtllib_network_init(ieee, beacon, network, stats)) {
2546  RTLLIB_DEBUG_SCAN("Dropped '%s' ( %pM) via %s.\n",
2547  escape_essid(info_element->data,
2548  info_element->len),
2549  beacon->header.addr3,
2550  WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2551  RTLLIB_STYPE_PROBE_RESP ?
2552  "PROBE RESPONSE" : "BEACON");
2553  goto free_network;
2554  }
2555 
2556 
2557  if (!rtllib_legal_channel(ieee, network->channel))
2558  goto free_network;
2559 
2560  if (WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2561  RTLLIB_STYPE_PROBE_RESP) {
2562  if (IsPassiveChannel(ieee, network->channel)) {
2563  printk(KERN_INFO "GetScanInfo(): For Global Domain, "
2564  "filter probe response at channel(%d).\n",
2565  network->channel);
2566  goto free_network;
2567  }
2568  }
2569 
2570  /* The network parsed correctly -- so now we scan our known networks
2571  * to see if we can find it in our list.
2572  *
2573  * NOTE: This search is definitely not optimized. Once its doing
2574  * the "right thing" we'll optimize it for efficiency if
2575  * necessary */
2576 
2577  /* Search for this entry in the list and update it if it is
2578  * already there. */
2579 
2580  spin_lock_irqsave(&ieee->lock, flags);
2581  if (is_same_network(&ieee->current_network, network,
2582  (network->ssid_len ? 1 : 0))) {
2583  update_network(&ieee->current_network, network);
2584  if ((ieee->current_network.mode == IEEE_N_24G ||
2585  ieee->current_network.mode == IEEE_G)
2586  && ieee->current_network.berp_info_valid) {
2587  if (ieee->current_network.erp_value & ERP_UseProtection)
2588  ieee->current_network.buseprotection = true;
2589  else
2590  ieee->current_network.buseprotection = false;
2591  }
2592  if (is_beacon(beacon->header.frame_ctl)) {
2593  if (ieee->state >= RTLLIB_LINKED)
2594  ieee->LinkDetectInfo.NumRecvBcnInPeriod++;
2595  }
2596  }
2597  list_for_each_entry(target, &ieee->network_list, list) {
2598  if (is_same_network(target, network,
2599  (target->ssid_len ? 1 : 0)))
2600  break;
2601  if ((oldest == NULL) ||
2602  (target->last_scanned < oldest->last_scanned))
2603  oldest = target;
2604  }
2605 
2606  /* If we didn't find a match, then get a new network slot to initialize
2607  * with this beacon's information */
2608  if (&target->list == &ieee->network_list) {
2609  if (list_empty(&ieee->network_free_list)) {
2610  /* If there are no more slots, expire the oldest */
2611  list_del(&oldest->list);
2612  target = oldest;
2613  RTLLIB_DEBUG_SCAN("Expired '%s' ( %pM) from "
2614  "network list.\n",
2615  escape_essid(target->ssid,
2616  target->ssid_len),
2617  target->bssid);
2618  } else {
2619  /* Otherwise just pull from the free list */
2620  target = list_entry(ieee->network_free_list.next,
2621  struct rtllib_network, list);
2622  list_del(ieee->network_free_list.next);
2623  }
2624 
2625 
2626  RTLLIB_DEBUG_SCAN("Adding '%s' ( %pM) via %s.\n",
2627  escape_essid(network->ssid,
2628  network->ssid_len), network->bssid,
2629  WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2630  RTLLIB_STYPE_PROBE_RESP ?
2631  "PROBE RESPONSE" : "BEACON");
2632  memcpy(target, network, sizeof(*target));
2633  list_add_tail(&target->list, &ieee->network_list);
2634  if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
2635  rtllib_softmac_new_net(ieee, network);
2636  } else {
2637  RTLLIB_DEBUG_SCAN("Updating '%s' ( %pM) via %s.\n",
2638  escape_essid(target->ssid,
2639  target->ssid_len), target->bssid,
2640  WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2641  RTLLIB_STYPE_PROBE_RESP ?
2642  "PROBE RESPONSE" : "BEACON");
2643 
2644  /* we have an entry and we are going to update it. But this
2645  * entry may be already expired. In this case we do the same
2646  * as we found a new net and call the new_net handler
2647  */
2648  renew = !time_after(target->last_scanned + ieee->scan_age,
2649  jiffies);
2650  if ((!target->ssid_len) &&
2651  (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
2652  || ((ieee->current_network.ssid_len == network->ssid_len) &&
2653  (strncmp(ieee->current_network.ssid, network->ssid,
2654  network->ssid_len) == 0) &&
2655  (ieee->state == RTLLIB_NOLINK))))
2656  renew = 1;
2657  update_network(target, network);
2658  if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
2659  rtllib_softmac_new_net(ieee, network);
2660  }
2661 
2662  spin_unlock_irqrestore(&ieee->lock, flags);
2663  if (is_beacon(beacon->header.frame_ctl) &&
2664  is_same_network(&ieee->current_network, network,
2665  (network->ssid_len ? 1 : 0)) &&
2666  (ieee->state == RTLLIB_LINKED)) {
2667  if (ieee->handle_beacon != NULL)
2668  ieee->handle_beacon(ieee->dev, beacon,
2669  &ieee->current_network);
2670  }
2671 free_network:
2672  kfree(network);
2673  return;
2674 }
2675 
2676 void rtllib_rx_mgt(struct rtllib_device *ieee,
2677  struct sk_buff *skb,
2678  struct rtllib_rx_stats *stats)
2679 {
2680  struct rtllib_hdr_4addr *header = (struct rtllib_hdr_4addr *)skb->data ;
2681 
2682  if (WLAN_FC_GET_STYPE(header->frame_ctl) != RTLLIB_STYPE_PROBE_RESP &&
2683  WLAN_FC_GET_STYPE(header->frame_ctl) != RTLLIB_STYPE_BEACON)
2684  ieee->last_rx_ps_time = jiffies;
2685 
2686  switch (WLAN_FC_GET_STYPE(header->frame_ctl)) {
2687 
2688  case RTLLIB_STYPE_BEACON:
2689  RTLLIB_DEBUG_MGMT("received BEACON (%d)\n",
2690  WLAN_FC_GET_STYPE(header->frame_ctl));
2691  RTLLIB_DEBUG_SCAN("Beacon\n");
2692  rtllib_process_probe_response(
2693  ieee, (struct rtllib_probe_response *)header,
2694  stats);
2695 
2696  if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
2697  ieee->iw_mode == IW_MODE_INFRA &&
2698  ieee->state == RTLLIB_LINKED))
2699  tasklet_schedule(&ieee->ps_task);
2700 
2701  break;
2702 
2703  case RTLLIB_STYPE_PROBE_RESP:
2704  RTLLIB_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
2705  WLAN_FC_GET_STYPE(header->frame_ctl));
2706  RTLLIB_DEBUG_SCAN("Probe response\n");
2707  rtllib_process_probe_response(ieee,
2708  (struct rtllib_probe_response *)header, stats);
2709  break;
2710  case RTLLIB_STYPE_PROBE_REQ:
2711  RTLLIB_DEBUG_MGMT("received PROBE RESQUEST (%d)\n",
2712  WLAN_FC_GET_STYPE(header->frame_ctl));
2713  RTLLIB_DEBUG_SCAN("Probe request\n");
2714  if ((ieee->softmac_features & IEEE_SOFTMAC_PROBERS) &&
2715  ((ieee->iw_mode == IW_MODE_ADHOC ||
2716  ieee->iw_mode == IW_MODE_MASTER) &&
2717  ieee->state == RTLLIB_LINKED))
2718  rtllib_rx_probe_rq(ieee, skb);
2719  break;
2720  }
2721 }
Generated on Thu Jan 10 2013 14:30:55 for Linux Kernel by   doxygen 1.8.2