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 * <jkmaline@cc.hut.fi>
7 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
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 <andreamrl@tiscali.it>
18
19 A special thanks goes to Realtek for their support !
20
21 ******************************************************************************/
22
23
24 #include <linux/compiler.h>
25 //#include <linux/config.h>
26 #include <linux/errno.h>
27 #include <linux/if_arp.h>
28 #include <linux/in6.h>
29 #include <linux/in.h>
30 #include <linux/ip.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/netdevice.h>
34 #include <linux/pci.h>
35 #include <linux/proc_fs.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <linux/tcp.h>
39 #include <linux/types.h>
40 #include <linux/wireless.h>
41 #include <linux/etherdevice.h>
42 #include <asm/uaccess.h>
43 #include <linux/ctype.h>
44
45 #include "ieee80211.h"
46 #include "dot11d.h"
ieee80211_monitor_rx(struct ieee80211_device * ieee,struct sk_buff * skb,struct ieee80211_rx_stats * rx_stats)47 static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee,
48 struct sk_buff *skb,
49 struct ieee80211_rx_stats *rx_stats)
50 {
51 struct ieee80211_hdr_4addr *hdr =
52 (struct ieee80211_hdr_4addr *)skb->data;
53 u16 fc = le16_to_cpu(hdr->frame_ctl);
54
55 skb->dev = ieee->dev;
56 skb_reset_mac_header(skb);
57 skb_pull(skb, ieee80211_get_hdrlen(fc));
58 skb->pkt_type = PACKET_OTHERHOST;
59 skb->protocol = __constant_htons(ETH_P_80211_RAW);
60 memset(skb->cb, 0, sizeof(skb->cb));
61 netif_rx(skb);
62 }
63
64
65 /* Called only as a tasklet (software IRQ) */
66 static struct ieee80211_frag_entry *
ieee80211_frag_cache_find(struct ieee80211_device * ieee,unsigned int seq,unsigned int frag,u8 tid,u8 * src,u8 * dst)67 ieee80211_frag_cache_find(struct ieee80211_device *ieee, unsigned int seq,
68 unsigned int frag, u8 tid,u8 *src, u8 *dst)
69 {
70 struct ieee80211_frag_entry *entry;
71 int i;
72
73 for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
74 entry = &ieee->frag_cache[tid][i];
75 if (entry->skb != NULL &&
76 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
77 IEEE80211_DEBUG_FRAG(
78 "expiring fragment cache entry "
79 "seq=%u last_frag=%u\n",
80 entry->seq, entry->last_frag);
81 dev_kfree_skb_any(entry->skb);
82 entry->skb = NULL;
83 }
84
85 if (entry->skb != NULL && entry->seq == seq &&
86 (entry->last_frag + 1 == frag || frag == -1) &&
87 memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
88 memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
89 return entry;
90 }
91
92 return NULL;
93 }
94
95 /* Called only as a tasklet (software IRQ) */
96 static struct sk_buff *
ieee80211_frag_cache_get(struct ieee80211_device * ieee,struct ieee80211_hdr_4addr * hdr)97 ieee80211_frag_cache_get(struct ieee80211_device *ieee,
98 struct ieee80211_hdr_4addr *hdr)
99 {
100 struct sk_buff *skb = NULL;
101 u16 fc = le16_to_cpu(hdr->frame_ctl);
102 u16 sc = le16_to_cpu(hdr->seq_ctl);
103 unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
104 unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
105 struct ieee80211_frag_entry *entry;
106 struct ieee80211_hdr_3addrqos *hdr_3addrqos;
107 struct ieee80211_hdr_4addrqos *hdr_4addrqos;
108 u8 tid;
109
110 if (((fc & IEEE80211_FCTL_DSTODS) == IEEE80211_FCTL_DSTODS)&&IEEE80211_QOS_HAS_SEQ(fc)) {
111 hdr_4addrqos = (struct ieee80211_hdr_4addrqos *)hdr;
112 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & IEEE80211_QOS_TID;
113 tid = UP2AC(tid);
114 tid ++;
115 } else if (IEEE80211_QOS_HAS_SEQ(fc)) {
116 hdr_3addrqos = (struct ieee80211_hdr_3addrqos *)hdr;
117 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & IEEE80211_QOS_TID;
118 tid = UP2AC(tid);
119 tid ++;
120 } else {
121 tid = 0;
122 }
123
124 if (frag == 0) {
125 /* Reserve enough space to fit maximum frame length */
126 skb = dev_alloc_skb(ieee->dev->mtu +
127 sizeof(struct ieee80211_hdr_4addr) +
128 8 /* LLC */ +
129 2 /* alignment */ +
130 8 /* WEP */ +
131 ETH_ALEN /* WDS */ +
132 (IEEE80211_QOS_HAS_SEQ(fc)?2:0) /* QOS Control */);
133 if (skb == NULL)
134 return NULL;
135
136 entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
137 ieee->frag_next_idx[tid]++;
138 if (ieee->frag_next_idx[tid] >= IEEE80211_FRAG_CACHE_LEN)
139 ieee->frag_next_idx[tid] = 0;
140
141 if (entry->skb != NULL)
142 dev_kfree_skb_any(entry->skb);
143
144 entry->first_frag_time = jiffies;
145 entry->seq = seq;
146 entry->last_frag = frag;
147 entry->skb = skb;
148 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
149 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
150 } else {
151 /* received a fragment of a frame for which the head fragment
152 * should have already been received */
153 entry = ieee80211_frag_cache_find(ieee, seq, frag, tid,hdr->addr2,
154 hdr->addr1);
155 if (entry != NULL) {
156 entry->last_frag = frag;
157 skb = entry->skb;
158 }
159 }
160
161 return skb;
162 }
163
164
165 /* Called only as a tasklet (software IRQ) */
ieee80211_frag_cache_invalidate(struct ieee80211_device * ieee,struct ieee80211_hdr_4addr * hdr)166 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
167 struct ieee80211_hdr_4addr *hdr)
168 {
169 u16 fc = le16_to_cpu(hdr->frame_ctl);
170 u16 sc = le16_to_cpu(hdr->seq_ctl);
171 unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
172 struct ieee80211_frag_entry *entry;
173 struct ieee80211_hdr_3addrqos *hdr_3addrqos;
174 struct ieee80211_hdr_4addrqos *hdr_4addrqos;
175 u8 tid;
176
177 if(((fc & IEEE80211_FCTL_DSTODS) == IEEE80211_FCTL_DSTODS)&&IEEE80211_QOS_HAS_SEQ(fc)) {
178 hdr_4addrqos = (struct ieee80211_hdr_4addrqos *)hdr;
179 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & IEEE80211_QOS_TID;
180 tid = UP2AC(tid);
181 tid ++;
182 } else if (IEEE80211_QOS_HAS_SEQ(fc)) {
183 hdr_3addrqos = (struct ieee80211_hdr_3addrqos *)hdr;
184 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & IEEE80211_QOS_TID;
185 tid = UP2AC(tid);
186 tid ++;
187 } else {
188 tid = 0;
189 }
190
191 entry = ieee80211_frag_cache_find(ieee, seq, -1, tid,hdr->addr2,
192 hdr->addr1);
193
194 if (entry == NULL) {
195 IEEE80211_DEBUG_FRAG(
196 "could not invalidate fragment cache "
197 "entry (seq=%u)\n", seq);
198 return -1;
199 }
200
201 entry->skb = NULL;
202 return 0;
203 }
204
205
206
207 /* ieee80211_rx_frame_mgtmt
208 *
209 * Responsible for handling management control frames
210 *
211 * Called by ieee80211_rx */
212 static inline int
ieee80211_rx_frame_mgmt(struct ieee80211_device * ieee,struct sk_buff * skb,struct ieee80211_rx_stats * rx_stats,u16 type,u16 stype)213 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
214 struct ieee80211_rx_stats *rx_stats, u16 type,
215 u16 stype)
216 {
217 struct ieee80211_hdr_4addr *hdr;
218
219 // cheat the the hdr type
220 hdr = (struct ieee80211_hdr_4addr *)skb->data;
221
222 /* On the struct stats definition there is written that
223 * this is not mandatory.... but seems that the probe
224 * response parser uses it
225 */
226 rx_stats->len = skb->len;
227 ieee80211_rx_mgt(ieee, (struct ieee80211_hdr_4addr *)skb->data,
228 rx_stats);
229
230 if((ieee->state == IEEE80211_LINKED)&&(memcmp(hdr->addr3,ieee->current_network.bssid,ETH_ALEN))) {
231 dev_kfree_skb_any(skb);
232 return 0;
233 }
234
235 ieee80211_rx_frame_softmac(ieee, skb, rx_stats, type, stype);
236
237 dev_kfree_skb_any(skb);
238
239 return 0;
240
241 }
242
243
244
245 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
246 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
247 static unsigned char rfc1042_header[] =
248 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
249 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
250 static unsigned char bridge_tunnel_header[] =
251 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
252 /* No encapsulation header if EtherType < 0x600 (=length) */
253
254 /* Called by ieee80211_rx_frame_decrypt */
ieee80211_is_eapol_frame(struct ieee80211_device * ieee,struct sk_buff * skb,size_t hdrlen)255 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
256 struct sk_buff *skb, size_t hdrlen)
257 {
258 struct net_device *dev = ieee->dev;
259 u16 fc, ethertype;
260 struct ieee80211_hdr_4addr *hdr;
261 u8 *pos;
262
263 if (skb->len < 24)
264 return 0;
265
266 hdr = (struct ieee80211_hdr_4addr *)skb->data;
267 fc = le16_to_cpu(hdr->frame_ctl);
268
269 /* check that the frame is unicast frame to us */
270 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
271 IEEE80211_FCTL_TODS &&
272 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
273 memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
274 /* ToDS frame with own addr BSSID and DA */
275 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
276 IEEE80211_FCTL_FROMDS &&
277 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
278 /* FromDS frame with own addr as DA */
279 } else
280 return 0;
281
282 if (skb->len < 24 + 8)
283 return 0;
284
285 /* check for port access entity Ethernet type */
286 // pos = skb->data + 24;
287 pos = skb->data + hdrlen;
288 ethertype = (pos[6] << 8) | pos[7];
289 if (ethertype == ETH_P_PAE)
290 return 1;
291
292 return 0;
293 }
294
295 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
296 static inline int
ieee80211_rx_frame_decrypt(struct ieee80211_device * ieee,struct sk_buff * skb,struct ieee80211_crypt_data * crypt)297 ieee80211_rx_frame_decrypt(struct ieee80211_device* ieee, struct sk_buff *skb,
298 struct ieee80211_crypt_data *crypt)
299 {
300 struct ieee80211_hdr_4addr *hdr;
301 int res, hdrlen;
302
303 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
304 return 0;
305
306 hdr = (struct ieee80211_hdr_4addr *)skb->data;
307 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
308
309 #ifdef CONFIG_IEEE80211_CRYPT_TKIP
310 if (ieee->tkip_countermeasures &&
311 strcmp(crypt->ops->name, "TKIP") == 0) {
312 if (net_ratelimit()) {
313 printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
314 "received packet from %pM\n",
315 ieee->dev->name, hdr->addr2);
316 }
317 return -1;
318 }
319 #endif
320
321 atomic_inc(&crypt->refcnt);
322 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
323 atomic_dec(&crypt->refcnt);
324 if (res < 0) {
325 IEEE80211_DEBUG_DROP(
326 "decryption failed (SA=%pM"
327 ") res=%d\n", hdr->addr2, res);
328 if (res == -2)
329 IEEE80211_DEBUG_DROP("Decryption failed ICV "
330 "mismatch (key %d)\n",
331 skb->data[hdrlen + 3] >> 6);
332 ieee->ieee_stats.rx_discards_undecryptable++;
333 return -1;
334 }
335
336 return res;
337 }
338
339
340 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
341 static inline int
ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device * ieee,struct sk_buff * skb,int keyidx,struct ieee80211_crypt_data * crypt)342 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device* ieee, struct sk_buff *skb,
343 int keyidx, struct ieee80211_crypt_data *crypt)
344 {
345 struct ieee80211_hdr_4addr *hdr;
346 int res, hdrlen;
347
348 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
349 return 0;
350
351 hdr = (struct ieee80211_hdr_4addr *)skb->data;
352 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
353
354 atomic_inc(&crypt->refcnt);
355 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
356 atomic_dec(&crypt->refcnt);
357 if (res < 0) {
358 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
359 " (SA=%pM keyidx=%d)\n",
360 ieee->dev->name, hdr->addr2, keyidx);
361 return -1;
362 }
363
364 return 0;
365 }
366
367
368 /* this function is stolen from ipw2200 driver*/
369 #define IEEE_PACKET_RETRY_TIME (5*HZ)
is_duplicate_packet(struct ieee80211_device * ieee,struct ieee80211_hdr_4addr * header)370 static int is_duplicate_packet(struct ieee80211_device *ieee,
371 struct ieee80211_hdr_4addr *header)
372 {
373 u16 fc = le16_to_cpu(header->frame_ctl);
374 u16 sc = le16_to_cpu(header->seq_ctl);
375 u16 seq = WLAN_GET_SEQ_SEQ(sc);
376 u16 frag = WLAN_GET_SEQ_FRAG(sc);
377 u16 *last_seq, *last_frag;
378 unsigned long *last_time;
379 struct ieee80211_hdr_3addrqos *hdr_3addrqos;
380 struct ieee80211_hdr_4addrqos *hdr_4addrqos;
381 u8 tid;
382
383 //TO2DS and QoS
384 if(((fc & IEEE80211_FCTL_DSTODS) == IEEE80211_FCTL_DSTODS)&&IEEE80211_QOS_HAS_SEQ(fc)) {
385 hdr_4addrqos = (struct ieee80211_hdr_4addrqos *)header;
386 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & IEEE80211_QOS_TID;
387 tid = UP2AC(tid);
388 tid ++;
389 } else if(IEEE80211_QOS_HAS_SEQ(fc)) { //QoS
390 hdr_3addrqos = (struct ieee80211_hdr_3addrqos *)header;
391 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & IEEE80211_QOS_TID;
392 tid = UP2AC(tid);
393 tid ++;
394 } else { // no QoS
395 tid = 0;
396 }
397 switch (ieee->iw_mode) {
398 case IW_MODE_ADHOC:
399 {
400 struct list_head *p;
401 struct ieee_ibss_seq *entry = NULL;
402 u8 *mac = header->addr2;
403 int index = mac[5] % IEEE_IBSS_MAC_HASH_SIZE;
404 //for (pos = (head)->next; pos != (head); pos = pos->next)
405 __list_for_each(p, &ieee->ibss_mac_hash[index]) {
406 entry = list_entry(p, struct ieee_ibss_seq, list);
407 if (!memcmp(entry->mac, mac, ETH_ALEN))
408 break;
409 }
410 // if (memcmp(entry->mac, mac, ETH_ALEN)){
411 if (p == &ieee->ibss_mac_hash[index]) {
412 entry = kmalloc(sizeof(struct ieee_ibss_seq), GFP_ATOMIC);
413 if (!entry) {
414 printk(KERN_WARNING "Cannot malloc new mac entry\n");
415 return 0;
416 }
417 memcpy(entry->mac, mac, ETH_ALEN);
418 entry->seq_num[tid] = seq;
419 entry->frag_num[tid] = frag;
420 entry->packet_time[tid] = jiffies;
421 list_add(&entry->list, &ieee->ibss_mac_hash[index]);
422 return 0;
423 }
424 last_seq = &entry->seq_num[tid];
425 last_frag = &entry->frag_num[tid];
426 last_time = &entry->packet_time[tid];
427 break;
428 }
429
430 case IW_MODE_INFRA:
431 last_seq = &ieee->last_rxseq_num[tid];
432 last_frag = &ieee->last_rxfrag_num[tid];
433 last_time = &ieee->last_packet_time[tid];
434
435 break;
436 default:
437 return 0;
438 }
439
440 // if(tid != 0) {
441 // printk(KERN_WARNING ":)))))))))))%x %x %x, fc(%x)\n", tid, *last_seq, seq, header->frame_ctl);
442 // }
443 if ((*last_seq == seq) &&
444 time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
445 if (*last_frag == frag){
446 //printk(KERN_WARNING "[1] go drop!\n");
447 goto drop;
448
449 }
450 if (*last_frag + 1 != frag)
451 /* out-of-order fragment */
452 //printk(KERN_WARNING "[2] go drop!\n");
453 goto drop;
454 } else
455 *last_seq = seq;
456
457 *last_frag = frag;
458 *last_time = jiffies;
459 return 0;
460
461 drop:
462 // BUG_ON(!(fc & IEEE80211_FCTL_RETRY));
463 // printk("DUP\n");
464
465 return 1;
466 }
467
468
469 /* All received frames are sent to this function. @skb contains the frame in
470 * IEEE 802.11 format, i.e., in the format it was sent over air.
471 * This function is called only as a tasklet (software IRQ). */
ieee80211_rtl_rx(struct ieee80211_device * ieee,struct sk_buff * skb,struct ieee80211_rx_stats * rx_stats)472 int ieee80211_rtl_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
473 struct ieee80211_rx_stats *rx_stats)
474 {
475 struct net_device *dev = ieee->dev;
476 //struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
477 struct ieee80211_hdr_4addr *hdr;
478
479 size_t hdrlen;
480 u16 fc, type, stype, sc;
481 struct net_device_stats *stats;
482 unsigned int frag;
483 u8 *payload;
484 u16 ethertype;
485 u8 dst[ETH_ALEN];
486 u8 src[ETH_ALEN];
487 u8 bssid[ETH_ALEN];
488 struct ieee80211_crypt_data *crypt = NULL;
489 int keyidx = 0;
490
491 // cheat the the hdr type
492 hdr = (struct ieee80211_hdr_4addr *)skb->data;
493 stats = &ieee->stats;
494
495 if (skb->len < 10) {
496 printk(KERN_INFO "%s: SKB length < 10\n",
497 dev->name);
498 goto rx_dropped;
499 }
500
501 fc = le16_to_cpu(hdr->frame_ctl);
502 type = WLAN_FC_GET_TYPE(fc);
503 stype = WLAN_FC_GET_STYPE(fc);
504 sc = le16_to_cpu(hdr->seq_ctl);
505
506 frag = WLAN_GET_SEQ_FRAG(sc);
507
508 //YJ,add,080828,for keep alive
509 if((fc & IEEE80211_FCTL_TODS) != IEEE80211_FCTL_TODS)
510 {
511 if(!memcmp(hdr->addr1,dev->dev_addr, ETH_ALEN))
512 {
513 ieee->NumRxUnicast++;
514 }
515 }
516 else
517 {
518 if(!memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN))
519 {
520 ieee->NumRxUnicast++;
521 }
522 }
523 //YJ,add,080828,for keep alive,end
524
525 hdrlen = ieee80211_get_hdrlen(fc);
526
527
528 if (ieee->iw_mode == IW_MODE_MONITOR) {
529 ieee80211_monitor_rx(ieee, skb, rx_stats);
530 stats->rx_packets++;
531 stats->rx_bytes += skb->len;
532 return 1;
533 }
534
535 if (ieee->host_decrypt) {
536 int idx = 0;
537 if (skb->len >= hdrlen + 3)
538 idx = skb->data[hdrlen + 3] >> 6;
539 crypt = ieee->crypt[idx];
540
541 /* allow NULL decrypt to indicate an station specific override
542 * for default encryption */
543 if (crypt && (crypt->ops == NULL ||
544 crypt->ops->decrypt_mpdu == NULL))
545 crypt = NULL;
546
547 if (!crypt && (fc & IEEE80211_FCTL_WEP)) {
548 /* This seems to be triggered by some (multicast?)
549 * frames from other than current BSS, so just drop the
550 * frames silently instead of filling system log with
551 * these reports. */
552 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
553 " (SA=%pM)\n",
554 hdr->addr2);
555 ieee->ieee_stats.rx_discards_undecryptable++;
556 goto rx_dropped;
557 }
558 }
559
560 if (skb->len < IEEE80211_DATA_HDR3_LEN)
561 goto rx_dropped;
562
563 // if QoS enabled, should check the sequence for each of the AC
564 if (is_duplicate_packet(ieee, hdr))
565 goto rx_dropped;
566
567
568 if (type == IEEE80211_FTYPE_MGMT) {
569 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
570 goto rx_dropped;
571 else
572 goto rx_exit;
573 }
574
575 /* Data frame - extract src/dst addresses */
576 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
577 case IEEE80211_FCTL_FROMDS:
578 memcpy(dst, hdr->addr1, ETH_ALEN);
579 memcpy(src, hdr->addr3, ETH_ALEN);
580 memcpy(bssid,hdr->addr2,ETH_ALEN);
581 break;
582 case IEEE80211_FCTL_TODS:
583 memcpy(dst, hdr->addr3, ETH_ALEN);
584 memcpy(src, hdr->addr2, ETH_ALEN);
585 memcpy(bssid,hdr->addr1,ETH_ALEN);
586 break;
587 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
588 if (skb->len < IEEE80211_DATA_HDR4_LEN)
589 goto rx_dropped;
590 memcpy(dst, hdr->addr3, ETH_ALEN);
591 memcpy(src, hdr->addr4, ETH_ALEN);
592 memcpy(bssid, ieee->current_network.bssid, ETH_ALEN);
593 break;
594 case 0:
595 memcpy(dst, hdr->addr1, ETH_ALEN);
596 memcpy(src, hdr->addr2, ETH_ALEN);
597 memcpy(bssid,hdr->addr3,ETH_ALEN);
598 break;
599 }
600
601
602 dev->last_rx = jiffies;
603
604
605 /* Nullfunc frames may have PS-bit set, so they must be passed to
606 * hostap_handle_sta_rx() before being dropped here. */
607 if (stype != IEEE80211_STYPE_DATA &&
608 stype != IEEE80211_STYPE_DATA_CFACK &&
609 stype != IEEE80211_STYPE_DATA_CFPOLL &&
610 stype != IEEE80211_STYPE_DATA_CFACKPOLL&&
611 stype != IEEE80211_STYPE_QOS_DATA//add by David,2006.8.4
612 ) {
613 if (stype != IEEE80211_STYPE_NULLFUNC)
614 IEEE80211_DEBUG_DROP(
615 "RX: dropped data frame "
616 "with no data (type=0x%02x, "
617 "subtype=0x%02x, len=%d)\n",
618 type, stype, skb->len);
619 goto rx_dropped;
620 }
621 if(memcmp(bssid,ieee->current_network.bssid,ETH_ALEN)) {
622 goto rx_dropped;
623 }
624
625 ieee->NumRxDataInPeriod++;
626 ieee->NumRxOkTotal++;
627 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
628
629 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
630 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
631 goto rx_dropped;
632
633 hdr = (struct ieee80211_hdr_4addr *)skb->data;
634
635 /* skb: hdr + (possibly fragmented) plaintext payload */
636 // PR: FIXME: hostap has additional conditions in the "if" below:
637 // ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
638 if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
639 int flen;
640 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
641 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
642
643 if (!frag_skb) {
644 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
645 "Rx cannot get skb from fragment "
646 "cache (morefrag=%d seq=%u frag=%u)\n",
647 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
648 WLAN_GET_SEQ_SEQ(sc), frag);
649 goto rx_dropped;
650 }
651 flen = skb->len;
652 if (frag != 0)
653 flen -= hdrlen;
654
655 if (frag_skb->tail + flen > frag_skb->end) {
656 printk(KERN_WARNING "%s: host decrypted and "
657 "reassembled frame did not fit skb\n",
658 dev->name);
659 ieee80211_frag_cache_invalidate(ieee, hdr);
660 goto rx_dropped;
661 }
662
663 if (frag == 0) {
664 /* copy first fragment (including full headers) into
665 * beginning of the fragment cache skb */
666 memcpy(skb_put(frag_skb, flen), skb->data, flen);
667 } else {
668 /* append frame payload to the end of the fragment
669 * cache skb */
670 memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
671 flen);
672 }
673 dev_kfree_skb_any(skb);
674 skb = NULL;
675
676 if (fc & IEEE80211_FCTL_MOREFRAGS) {
677 /* more fragments expected - leave the skb in fragment
678 * cache for now; it will be delivered to upper layers
679 * after all fragments have been received */
680 goto rx_exit;
681 }
682
683 /* this was the last fragment and the frame will be
684 * delivered, so remove skb from fragment cache */
685 skb = frag_skb;
686 hdr = (struct ieee80211_hdr_4addr *)skb->data;
687 ieee80211_frag_cache_invalidate(ieee, hdr);
688 }
689
690 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
691 * encrypted/authenticated */
692 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_WEP) &&
693 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
694 goto rx_dropped;
695
696 hdr = (struct ieee80211_hdr_4addr *)skb->data;
697 if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep) {
698 if (/*ieee->ieee802_1x &&*/
699 ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
700
701 #ifdef CONFIG_IEEE80211_DEBUG
702 /* pass unencrypted EAPOL frames even if encryption is
703 * configured */
704 struct eapol *eap = (struct eapol *)(skb->data +
705 24);
706 IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
707 eap_get_type(eap->type));
708 #endif
709 } else {
710 IEEE80211_DEBUG_DROP(
711 "encryption configured, but RX "
712 "frame not encrypted (SA=%pM)\n",
713 hdr->addr2);
714 goto rx_dropped;
715 }
716 }
717
718 #ifdef CONFIG_IEEE80211_DEBUG
719 if (crypt && !(fc & IEEE80211_FCTL_WEP) &&
720 ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
721 struct eapol *eap = (struct eapol *)(skb->data +
722 24);
723 IEEE80211_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
724 eap_get_type(eap->type));
725 }
726 #endif
727
728 if (crypt && !(fc & IEEE80211_FCTL_WEP) && !ieee->open_wep &&
729 !ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
730 IEEE80211_DEBUG_DROP(
731 "dropped unencrypted RX data "
732 "frame from %pM"
733 " (drop_unencrypted=1)\n",
734 hdr->addr2);
735 goto rx_dropped;
736 }
737 /*
738 if(ieee80211_is_eapol_frame(ieee, skb, hdrlen)) {
739 printk(KERN_WARNING "RX: IEEE802.1X EPAOL frame!\n");
740 }
741 */
742 /* skb: hdr + (possible reassembled) full plaintext payload */
743 payload = skb->data + hdrlen;
744 ethertype = (payload[6] << 8) | payload[7];
745
746
747 /* convert hdr + possible LLC headers into Ethernet header */
748 if (skb->len - hdrlen >= 8 &&
749 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
750 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
751 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
752 /* remove RFC1042 or Bridge-Tunnel encapsulation and
753 * replace EtherType */
754 skb_pull(skb, hdrlen + SNAP_SIZE);
755 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
756 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
757 } else {
758 u16 len;
759 /* Leave Ethernet header part of hdr and full payload */
760 skb_pull(skb, hdrlen);
761 len = htons(skb->len);
762 memcpy(skb_push(skb, 2), &len, 2);
763 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
764 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
765 }
766
767
768 stats->rx_packets++;
769 stats->rx_bytes += skb->len;
770
771 if (skb) {
772 skb->protocol = eth_type_trans(skb, dev);
773 memset(skb->cb, 0, sizeof(skb->cb));
774 skb->dev = dev;
775 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
776 ieee->last_rx_ps_time = jiffies;
777 netif_rx(skb);
778 }
779
780 rx_exit:
781 return 1;
782
783 rx_dropped:
784 stats->rx_dropped++;
785
786 /* Returning 0 indicates to caller that we have not handled the SKB--
787 * so it is still allocated and can be used again by underlying
788 * hardware as a DMA target */
789 return 0;
790 }
791
792 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
793
ieee80211_is_ofdm_rate(u8 rate)794 static inline int ieee80211_is_ofdm_rate(u8 rate)
795 {
796 switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
797 case IEEE80211_OFDM_RATE_6MB:
798 case IEEE80211_OFDM_RATE_9MB:
799 case IEEE80211_OFDM_RATE_12MB:
800 case IEEE80211_OFDM_RATE_18MB:
801 case IEEE80211_OFDM_RATE_24MB:
802 case IEEE80211_OFDM_RATE_36MB:
803 case IEEE80211_OFDM_RATE_48MB:
804 case IEEE80211_OFDM_RATE_54MB:
805 return 1;
806 }
807 return 0;
808 }
809
ieee80211_SignalStrengthTranslate(int CurrSS)810 static inline int ieee80211_SignalStrengthTranslate(
811 int CurrSS
812 )
813 {
814 int RetSS;
815
816 // Step 1. Scale mapping.
817 if(CurrSS >= 71 && CurrSS <= 100)
818 {
819 RetSS = 90 + ((CurrSS - 70) / 3);
820 }
821 else if(CurrSS >= 41 && CurrSS <= 70)
822 {
823 RetSS = 78 + ((CurrSS - 40) / 3);
824 }
825 else if(CurrSS >= 31 && CurrSS <= 40)
826 {
827 RetSS = 66 + (CurrSS - 30);
828 }
829 else if(CurrSS >= 21 && CurrSS <= 30)
830 {
831 RetSS = 54 + (CurrSS - 20);
832 }
833 else if(CurrSS >= 5 && CurrSS <= 20)
834 {
835 RetSS = 42 + (((CurrSS - 5) * 2) / 3);
836 }
837 else if(CurrSS == 4)
838 {
839 RetSS = 36;
840 }
841 else if(CurrSS == 3)
842 {
843 RetSS = 27;
844 }
845 else if(CurrSS == 2)
846 {
847 RetSS = 18;
848 }
849 else if(CurrSS == 1)
850 {
851 RetSS = 9;
852 }
853 else
854 {
855 RetSS = CurrSS;
856 }
857 //RT_TRACE(COMP_DBG, DBG_LOUD, ("##### After Mapping: LastSS: %d, CurrSS: %d, RetSS: %d\n", LastSS, CurrSS, RetSS));
858
859 // Step 2. Smoothing.
860
861 //RT_TRACE(COMP_DBG, DBG_LOUD, ("$$$$$ After Smoothing: LastSS: %d, CurrSS: %d, RetSS: %d\n", LastSS, CurrSS, RetSS));
862
863 return RetSS;
864 }
865
ieee80211_extract_country_ie(struct ieee80211_device * ieee,struct ieee80211_info_element * info_element,struct ieee80211_network * network,u8 * addr2)866 static inline void ieee80211_extract_country_ie(
867 struct ieee80211_device *ieee,
868 struct ieee80211_info_element *info_element,
869 struct ieee80211_network *network,
870 u8 * addr2
871 )
872 {
873 if(IS_DOT11D_ENABLE(ieee))
874 {
875 if(info_element->len!= 0)
876 {
877 memcpy(network->CountryIeBuf, info_element->data, info_element->len);
878 network->CountryIeLen = info_element->len;
879
880 if(!IS_COUNTRY_IE_VALID(ieee))
881 {
882 Dot11d_UpdateCountryIe(ieee, addr2, info_element->len, info_element->data);
883 }
884 }
885
886 //
887 // 070305, rcnjko: I update country IE watch dog here because
888 // some AP (e.g. Cisco 1242) don't include country IE in their
889 // probe response frame.
890 //
891 if(IS_EQUAL_CIE_SRC(ieee, addr2) )
892 {
893 UPDATE_CIE_WATCHDOG(ieee);
894 }
895 }
896
897 }
898
899 int
ieee80211_TranslateToDbm(unsigned char SignalStrengthIndex)900 ieee80211_TranslateToDbm(
901 unsigned char SignalStrengthIndex // 0-100 index.
902 )
903 {
904 unsigned char SignalPower; // in dBm.
905
906 // Translate to dBm (x=0.5y-95).
907 SignalPower = (int)SignalStrengthIndex * 7 / 10;
908 SignalPower -= 95;
909
910 return SignalPower;
911 }
ieee80211_network_init(struct ieee80211_device * ieee,struct ieee80211_probe_response * beacon,struct ieee80211_network * network,struct ieee80211_rx_stats * stats)912 inline int ieee80211_network_init(
913 struct ieee80211_device *ieee,
914 struct ieee80211_probe_response *beacon,
915 struct ieee80211_network *network,
916 struct ieee80211_rx_stats *stats)
917 {
918 #ifdef CONFIG_IEEE80211_DEBUG
919 char rates_str[64];
920 char *p;
921 #endif
922 struct ieee80211_info_element *info_element;
923 u16 left;
924 u8 i;
925 short offset;
926 u8 curRate = 0,hOpRate = 0,curRate_ex = 0;
927
928 /* Pull out fixed field data */
929 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
930 network->capability = beacon->capability;
931 network->last_scanned = jiffies;
932 network->time_stamp[0] = beacon->time_stamp[0];
933 network->time_stamp[1] = beacon->time_stamp[1];
934 network->beacon_interval = beacon->beacon_interval;
935 /* Where to pull this? beacon->listen_interval;*/
936 network->listen_interval = 0x0A;
937 network->rates_len = network->rates_ex_len = 0;
938 network->last_associate = 0;
939 network->ssid_len = 0;
940 network->flags = 0;
941 network->atim_window = 0;
942 network->QoS_Enable = 0;
943 //by amy 080312
944 network->HighestOperaRate = 0;
945 //by amy 080312
946 network->Turbo_Enable = 0;
947 network->CountryIeLen = 0;
948 memset(network->CountryIeBuf, 0, MAX_IE_LEN);
949
950 if (stats->freq == IEEE80211_52GHZ_BAND) {
951 /* for A band (No DS info) */
952 network->channel = stats->received_channel;
953 } else
954 network->flags |= NETWORK_HAS_CCK;
955
956 network->wpa_ie_len = 0;
957 network->rsn_ie_len = 0;
958
959 info_element = &beacon->info_element;
960 left = stats->len - ((void *)info_element - (void *)beacon);
961 while (left >= sizeof(struct ieee80211_info_element_hdr)) {
962 if (sizeof(struct ieee80211_info_element_hdr) + info_element->len > left) {
963 IEEE80211_DEBUG_SCAN("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%d left=%d.\n",
964 info_element->len + sizeof(struct ieee80211_info_element),
965 left);
966 return 1;
967 }
968
969 switch (info_element->id) {
970 case MFIE_TYPE_SSID:
971 if (ieee80211_is_empty_essid(info_element->data,
972 info_element->len)) {
973 network->flags |= NETWORK_EMPTY_ESSID;
974 break;
975 }
976
977 network->ssid_len = min(info_element->len,
978 (u8)IW_ESSID_MAX_SIZE);
979 memcpy(network->ssid, info_element->data, network->ssid_len);
980 if (network->ssid_len < IW_ESSID_MAX_SIZE)
981 memset(network->ssid + network->ssid_len, 0,
982 IW_ESSID_MAX_SIZE - network->ssid_len);
983
984 IEEE80211_DEBUG_SCAN("MFIE_TYPE_SSID: '%s' len=%d.\n",
985 network->ssid, network->ssid_len);
986 break;
987
988 case MFIE_TYPE_RATES:
989 #ifdef CONFIG_IEEE80211_DEBUG
990 p = rates_str;
991 #endif
992 network->rates_len = min(info_element->len, MAX_RATES_LENGTH);
993 for (i = 0; i < network->rates_len; i++) {
994 network->rates[i] = info_element->data[i];
995 curRate = network->rates[i] & 0x7f;
996 if( hOpRate < curRate )
997 hOpRate = curRate;
998 #ifdef CONFIG_IEEE80211_DEBUG
999 p += snprintf(p, sizeof(rates_str) - (p - rates_str), "%02X ", network->rates[i]);
1000 #endif
1001 if (ieee80211_is_ofdm_rate(info_element->data[i])) {
1002 network->flags |= NETWORK_HAS_OFDM;
1003 if (info_element->data[i] &
1004 IEEE80211_BASIC_RATE_MASK)
1005 network->flags &=
1006 ~NETWORK_HAS_CCK;
1007 }
1008 }
1009
1010 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES: '%s' (%d)\n",
1011 rates_str, network->rates_len);
1012 break;
1013
1014 case MFIE_TYPE_RATES_EX:
1015 #ifdef CONFIG_IEEE80211_DEBUG
1016 p = rates_str;
1017 #endif
1018 network->rates_ex_len = min(info_element->len, MAX_RATES_EX_LENGTH);
1019 for (i = 0; i < network->rates_ex_len; i++) {
1020 network->rates_ex[i] = info_element->data[i];
1021 curRate_ex = network->rates_ex[i] & 0x7f;
1022 if( hOpRate < curRate_ex )
1023 hOpRate = curRate_ex;
1024 #ifdef CONFIG_IEEE80211_DEBUG
1025 p += snprintf(p, sizeof(rates_str) - (p - rates_str), "%02X ", network->rates[i]);
1026 #endif
1027 if (ieee80211_is_ofdm_rate(info_element->data[i])) {
1028 network->flags |= NETWORK_HAS_OFDM;
1029 if (info_element->data[i] &
1030 IEEE80211_BASIC_RATE_MASK)
1031 network->flags &=
1032 ~NETWORK_HAS_CCK;
1033 }
1034 }
1035
1036 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1037 rates_str, network->rates_ex_len);
1038 break;
1039
1040 case MFIE_TYPE_DS_SET:
1041 IEEE80211_DEBUG_SCAN("MFIE_TYPE_DS_SET: %d\n",
1042 info_element->data[0]);
1043 if (stats->freq == IEEE80211_24GHZ_BAND)
1044 network->channel = info_element->data[0];
1045 break;
1046
1047 case MFIE_TYPE_FH_SET:
1048 IEEE80211_DEBUG_SCAN("MFIE_TYPE_FH_SET: ignored\n");
1049 break;
1050
1051 case MFIE_TYPE_CF_SET:
1052 IEEE80211_DEBUG_SCAN("MFIE_TYPE_CF_SET: ignored\n");
1053 break;
1054
1055 case MFIE_TYPE_TIM:
1056
1057 if(info_element->len < 4)
1058 break;
1059
1060 network->dtim_period = info_element->data[1];
1061
1062 if(ieee->state != IEEE80211_LINKED)
1063 break;
1064
1065 network->last_dtim_sta_time[0] = jiffies;
1066 network->last_dtim_sta_time[1] = stats->mac_time[1];
1067
1068 network->dtim_data = IEEE80211_DTIM_VALID;
1069
1070 if(info_element->data[0] != 0)
1071 break;
1072
1073 if(info_element->data[2] & 1)
1074 network->dtim_data |= IEEE80211_DTIM_MBCAST;
1075
1076 offset = (info_element->data[2] >> 1)*2;
1077
1078 //printk("offset1:%x aid:%x\n",offset, ieee->assoc_id);
1079
1080 /* add and modified for ps 2008.1.22 */
1081 if(ieee->assoc_id < 8*offset ||
1082 ieee->assoc_id > 8*(offset + info_element->len -3)) {
1083 break;
1084 }
1085
1086 offset = (ieee->assoc_id/8) - offset;// + ((aid % 8)? 0 : 1) ;
1087
1088 // printk("offset:%x data:%x, ucast:%d\n", offset,
1089 // info_element->data[3+offset] ,
1090 // info_element->data[3+offset] & (1<<(ieee->assoc_id%8)));
1091
1092 if(info_element->data[3+offset] & (1<<(ieee->assoc_id%8))) {
1093 network->dtim_data |= IEEE80211_DTIM_UCAST;
1094 }
1095 break;
1096
1097 case MFIE_TYPE_IBSS_SET:
1098 IEEE80211_DEBUG_SCAN("MFIE_TYPE_IBSS_SET: ignored\n");
1099 break;
1100
1101 case MFIE_TYPE_CHALLENGE:
1102 IEEE80211_DEBUG_SCAN("MFIE_TYPE_CHALLENGE: ignored\n");
1103 break;
1104
1105 case MFIE_TYPE_GENERIC:
1106 //nic is 87B
1107 IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",
1108 info_element->len);
1109 if (info_element->len >= 4 &&
1110 info_element->data[0] == 0x00 &&
1111 info_element->data[1] == 0x50 &&
1112 info_element->data[2] == 0xf2 &&
1113 info_element->data[3] == 0x01) {
1114 network->wpa_ie_len = min(info_element->len + 2,
1115 MAX_WPA_IE_LEN);
1116 memcpy(network->wpa_ie, info_element,
1117 network->wpa_ie_len);
1118 }
1119
1120 if (info_element->len == 7 &&
1121 info_element->data[0] == 0x00 &&
1122 info_element->data[1] == 0xe0 &&
1123 info_element->data[2] == 0x4c &&
1124 info_element->data[3] == 0x01 &&
1125 info_element->data[4] == 0x02) {
1126 network->Turbo_Enable = 1;
1127 }
1128 if (1 == stats->nic_type) {//nic 87
1129 break;
1130 }
1131
1132 if (info_element->len >= 5 &&
1133 info_element->data[0] == 0x00 &&
1134 info_element->data[1] == 0x50 &&
1135 info_element->data[2] == 0xf2 &&
1136 info_element->data[3] == 0x02 &&
1137 info_element->data[4] == 0x00) {
1138 //printk(KERN_WARNING "wmm info updated: %x\n", info_element->data[6]);
1139 //WMM Information Element
1140 network->wmm_info = info_element->data[6];
1141 network->QoS_Enable = 1;
1142 }
1143
1144 if (info_element->len >= 8 &&
1145 info_element->data[0] == 0x00 &&
1146 info_element->data[1] == 0x50 &&
1147 info_element->data[2] == 0xf2 &&
1148 info_element->data[3] == 0x02 &&
1149 info_element->data[4] == 0x01) {
1150 // Not care about version at present.
1151 //WMM Information Element
1152 //printk(KERN_WARNING "wmm info¶m updated: %x\n", info_element->data[6]);
1153 network->wmm_info = info_element->data[6];
1154 //WMM Parameter Element
1155 memcpy(network->wmm_param, (u8 *)(info_element->data + 8),(info_element->len - 8));
1156 network->QoS_Enable = 1;
1157 }
1158 break;
1159
1160 case MFIE_TYPE_RSN:
1161 IEEE80211_DEBUG_SCAN("MFIE_TYPE_RSN: %d bytes\n",
1162 info_element->len);
1163 network->rsn_ie_len = min(info_element->len + 2,
1164 MAX_WPA_IE_LEN);
1165 memcpy(network->rsn_ie, info_element,
1166 network->rsn_ie_len);
1167 break;
1168 case MFIE_TYPE_COUNTRY:
1169 IEEE80211_DEBUG_SCAN("MFIE_TYPE_COUNTRY: %d bytes\n",
1170 info_element->len);
1171 // printk("=====>Receive <%s> Country IE\n",network->ssid);
1172 ieee80211_extract_country_ie(ieee, info_element, network, beacon->header.addr2);
1173 break;
1174 default:
1175 IEEE80211_DEBUG_SCAN("unsupported IE %d\n",
1176 info_element->id);
1177 break;
1178 }
1179
1180 left -= sizeof(struct ieee80211_info_element_hdr) +
1181 info_element->len;
1182 info_element = (struct ieee80211_info_element *)
1183 &info_element->data[info_element->len];
1184 }
1185 //by amy 080312
1186 network->HighestOperaRate = hOpRate;
1187 //by amy 080312
1188 network->mode = 0;
1189 if (stats->freq == IEEE80211_52GHZ_BAND)
1190 network->mode = IEEE_A;
1191 else {
1192 if (network->flags & NETWORK_HAS_OFDM)
1193 network->mode |= IEEE_G;
1194 if (network->flags & NETWORK_HAS_CCK)
1195 network->mode |= IEEE_B;
1196 }
1197
1198 if (network->mode == 0) {
1199 IEEE80211_DEBUG_SCAN("Filtered out '%s (%pM)' "
1200 "network.\n",
1201 escape_essid(network->ssid,
1202 network->ssid_len),
1203 network->bssid);
1204 return 1;
1205 }
1206
1207 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1208 network->flags |= NETWORK_EMPTY_ESSID;
1209
1210 stats->signal = ieee80211_TranslateToDbm(stats->signalstrength);
1211 //stats->noise = stats->signal - stats->noise;
1212 stats->noise = ieee80211_TranslateToDbm(100 - stats->signalstrength) - 25;
1213 memcpy(&network->stats, stats, sizeof(network->stats));
1214
1215 return 0;
1216 }
1217
is_same_network(struct ieee80211_network * src,struct ieee80211_network * dst,struct ieee80211_device * ieee)1218 static inline int is_same_network(struct ieee80211_network *src,
1219 struct ieee80211_network *dst,
1220 struct ieee80211_device * ieee)
1221 {
1222 /* A network is only a duplicate if the channel, BSSID, ESSID
1223 * and the capability field (in particular IBSS and BSS) all match.
1224 * We treat all <hidden> with the same BSSID and channel
1225 * as one network */
1226 return (((src->ssid_len == dst->ssid_len) || (ieee->iw_mode == IW_MODE_INFRA)) && //YJ,mod,080819,for hidden ap
1227 //((src->ssid_len == dst->ssid_len) &&
1228 (src->channel == dst->channel) &&
1229 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
1230 (!memcmp(src->ssid, dst->ssid, src->ssid_len) || (ieee->iw_mode == IW_MODE_INFRA)) && //YJ,mod,080819,for hidden ap
1231 //!memcmp(src->ssid, dst->ssid, src->ssid_len) &&
1232 ((src->capability & WLAN_CAPABILITY_IBSS) ==
1233 (dst->capability & WLAN_CAPABILITY_IBSS)) &&
1234 ((src->capability & WLAN_CAPABILITY_BSS) ==
1235 (dst->capability & WLAN_CAPABILITY_BSS)));
1236 }
1237
update_network(struct ieee80211_network * dst,struct ieee80211_network * src)1238 inline void update_network(struct ieee80211_network *dst,
1239 struct ieee80211_network *src)
1240 {
1241 unsigned char quality = src->stats.signalstrength;
1242 unsigned char signal = 0;
1243 unsigned char noise = 0;
1244 if(dst->stats.signalstrength > 0) {
1245 quality = (dst->stats.signalstrength * 5 + src->stats.signalstrength + 5)/6;
1246 }
1247 signal = ieee80211_TranslateToDbm(quality);
1248 //noise = signal - src->stats.noise;
1249 if(dst->stats.noise > 0)
1250 noise = (dst->stats.noise * 5 + src->stats.noise)/6;
1251 //if(strcmp(dst->ssid, "linksys_lzm000") == 0)
1252 // printk("ssid:%s, quality:%d, signal:%d\n", dst->ssid, quality, signal);
1253 memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1254 dst->stats.signalstrength = quality;
1255 dst->stats.signal = signal;
1256 // printk("==================>stats.signal is %d\n",dst->stats.signal);
1257 dst->stats.noise = noise;
1258
1259
1260 dst->capability = src->capability;
1261 memcpy(dst->rates, src->rates, src->rates_len);
1262 dst->rates_len = src->rates_len;
1263 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1264 dst->rates_ex_len = src->rates_ex_len;
1265 dst->HighestOperaRate= src->HighestOperaRate;
1266 //printk("==========>in %s: src->ssid is %s,chan is %d\n",__func__,src->ssid,src->channel);
1267
1268 //YJ,add,080819,for hidden ap
1269 if(src->ssid_len > 0)
1270 {
1271 //if(src->ssid_len == 13)
1272 // printk("=====================>>>>>>>> Dst ssid: %s Src ssid: %s\n", dst->ssid, src->ssid);
1273 memset(dst->ssid, 0, dst->ssid_len);
1274 dst->ssid_len = src->ssid_len;
1275 memcpy(dst->ssid, src->ssid, src->ssid_len);
1276 }
1277 //YJ,add,080819,for hidden ap,end
1278
1279 dst->channel = src->channel;
1280 dst->mode = src->mode;
1281 dst->flags = src->flags;
1282 dst->time_stamp[0] = src->time_stamp[0];
1283 dst->time_stamp[1] = src->time_stamp[1];
1284
1285 dst->beacon_interval = src->beacon_interval;
1286 dst->listen_interval = src->listen_interval;
1287 dst->atim_window = src->atim_window;
1288 dst->dtim_period = src->dtim_period;
1289 dst->dtim_data = src->dtim_data;
1290 dst->last_dtim_sta_time[0] = src->last_dtim_sta_time[0];
1291 dst->last_dtim_sta_time[1] = src->last_dtim_sta_time[1];
1292 // printk("update:%s, dtim_period:%x, dtim_data:%x\n", src->ssid, src->dtim_period, src->dtim_data);
1293 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1294 dst->wpa_ie_len = src->wpa_ie_len;
1295 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1296 dst->rsn_ie_len = src->rsn_ie_len;
1297
1298 dst->last_scanned = jiffies;
1299 /* dst->last_associate is not overwritten */
1300 // disable QoS process now, added by David 2006/7/25
1301 #if 1
1302 dst->wmm_info = src->wmm_info; //sure to exist in beacon or probe response frame.
1303 /*
1304 if((dst->wmm_info^src->wmm_info)&0x0f) {//Param Set Count change, update Parameter
1305 memcpy(dst->wmm_param, src->wmm_param, IEEE80211_AC_PRAM_LEN);
1306 }
1307 */
1308 if(src->wmm_param[0].ac_aci_acm_aifsn|| \
1309 src->wmm_param[1].ac_aci_acm_aifsn|| \
1310 src->wmm_param[2].ac_aci_acm_aifsn|| \
1311 src->wmm_param[3].ac_aci_acm_aifsn) {
1312 memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
1313 }
1314 dst->QoS_Enable = src->QoS_Enable;
1315 #else
1316 dst->QoS_Enable = 1;//for Rtl8187 simulation
1317 #endif
1318 dst->SignalStrength = src->SignalStrength;
1319 dst->Turbo_Enable = src->Turbo_Enable;
1320 dst->CountryIeLen = src->CountryIeLen;
1321 memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
1322 }
1323
1324
ieee80211_process_probe_response(struct ieee80211_device * ieee,struct ieee80211_probe_response * beacon,struct ieee80211_rx_stats * stats)1325 inline void ieee80211_process_probe_response(
1326 struct ieee80211_device *ieee,
1327 struct ieee80211_probe_response *beacon,
1328 struct ieee80211_rx_stats *stats)
1329 {
1330 struct ieee80211_network network;
1331 struct ieee80211_network *target;
1332 struct ieee80211_network *oldest = NULL;
1333 #ifdef CONFIG_IEEE80211_DEBUG
1334 struct ieee80211_info_element *info_element = &beacon->info_element;
1335 #endif
1336 unsigned long flags;
1337 short renew;
1338 u8 wmm_info;
1339 u8 is_beacon = (WLAN_FC_GET_STYPE(beacon->header.frame_ctl) == IEEE80211_STYPE_BEACON)? 1:0; //YJ,add,080819,for hidden ap
1340
1341 memset(&network, 0, sizeof(struct ieee80211_network));
1342
1343 IEEE80211_DEBUG_SCAN(
1344 "'%s' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1345 escape_essid(info_element->data, info_element->len),
1346 beacon->header.addr3,
1347 (beacon->capability & (1<<0xf)) ? '1' : '0',
1348 (beacon->capability & (1<<0xe)) ? '1' : '0',
1349 (beacon->capability & (1<<0xd)) ? '1' : '0',
1350 (beacon->capability & (1<<0xc)) ? '1' : '0',
1351 (beacon->capability & (1<<0xb)) ? '1' : '0',
1352 (beacon->capability & (1<<0xa)) ? '1' : '0',
1353 (beacon->capability & (1<<0x9)) ? '1' : '0',
1354 (beacon->capability & (1<<0x8)) ? '1' : '0',
1355 (beacon->capability & (1<<0x7)) ? '1' : '0',
1356 (beacon->capability & (1<<0x6)) ? '1' : '0',
1357 (beacon->capability & (1<<0x5)) ? '1' : '0',
1358 (beacon->capability & (1<<0x4)) ? '1' : '0',
1359 (beacon->capability & (1<<0x3)) ? '1' : '0',
1360 (beacon->capability & (1<<0x2)) ? '1' : '0',
1361 (beacon->capability & (1<<0x1)) ? '1' : '0',
1362 (beacon->capability & (1<<0x0)) ? '1' : '0');
1363
1364 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1365 IEEE80211_DEBUG_SCAN("Dropped '%s' (%pM) via %s.\n",
1366 escape_essid(info_element->data,
1367 info_element->len),
1368 beacon->header.addr3,
1369 WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
1370 IEEE80211_STYPE_PROBE_RESP ?
1371 "PROBE RESPONSE" : "BEACON");
1372 return;
1373 }
1374
1375 // For Asus EeePc request,
1376 // (1) if wireless adapter receive get any 802.11d country code in AP beacon,
1377 // wireless adapter should follow the country code.
1378 // (2) If there is no any country code in beacon,
1379 // then wireless adapter should do active scan from ch1~11 and
1380 // passive scan from ch12~14
1381 if(ieee->bGlobalDomain)
1382 {
1383 if (WLAN_FC_GET_STYPE(beacon->header.frame_ctl) == IEEE80211_STYPE_PROBE_RESP)
1384 {
1385 // Case 1: Country code
1386 if(IS_COUNTRY_IE_VALID(ieee) )
1387 {
1388 if( !IsLegalChannel(ieee, network.channel) )
1389 {
1390 printk("GetScanInfo(): For Country code, filter probe response at channel(%d).\n", network.channel);
1391 return;
1392 }
1393 }
1394 // Case 2: No any country code.
1395 else
1396 {
1397 // Filter over channel ch12~14
1398 if(network.channel > 11)
1399 {
1400 printk("GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n", network.channel);
1401 return;
1402 }
1403 }
1404 }
1405 else
1406 {
1407 // Case 1: Country code
1408 if(IS_COUNTRY_IE_VALID(ieee) )
1409 {
1410 if( !IsLegalChannel(ieee, network.channel) )
1411 {
1412 printk("GetScanInfo(): For Country code, filter beacon at channel(%d).\n",network.channel);
1413 return;
1414 }
1415 }
1416 // Case 2: No any country code.
1417 else
1418 {
1419 // Filter over channel ch12~14
1420 if(network.channel > 14)
1421 {
1422 printk("GetScanInfo(): For Global Domain, filter beacon at channel(%d).\n",network.channel);
1423 return;
1424 }
1425 }
1426 }
1427 }
1428 /* The network parsed correctly -- so now we scan our known networks
1429 * to see if we can find it in our list.
1430 *
1431 * NOTE: This search is definitely not optimized. Once its doing
1432 * the "right thing" we'll optimize it for efficiency if
1433 * necessary */
1434
1435 /* Search for this entry in the list and update it if it is
1436 * already there. */
1437
1438 spin_lock_irqsave(&ieee->lock, flags);
1439
1440 if(is_same_network(&ieee->current_network, &network, ieee)) {
1441 wmm_info = ieee->current_network.wmm_info;
1442 //YJ,add,080819,for hidden ap
1443 if(is_beacon == 0)
1444 network.flags = (~NETWORK_EMPTY_ESSID & network.flags)|(NETWORK_EMPTY_ESSID & ieee->current_network.flags);
1445 else if(ieee->state == IEEE80211_LINKED)
1446 ieee->NumRxBcnInPeriod++;
1447 //YJ,add,080819,for hidden ap,end
1448 //printk("====>network.ssid=%s cur_ssid=%s\n", network.ssid, ieee->current_network.ssid);
1449 update_network(&ieee->current_network, &network);
1450 }
1451
1452 list_for_each_entry(target, &ieee->network_list, list) {
1453 if (is_same_network(target, &network, ieee))
1454 break;
1455 if ((oldest == NULL) ||
1456 (target->last_scanned < oldest->last_scanned))
1457 oldest = target;
1458 }
1459
1460 /* If we didn't find a match, then get a new network slot to initialize
1461 * with this beacon's information */
1462 if (&target->list == &ieee->network_list) {
1463 if (list_empty(&ieee->network_free_list)) {
1464 /* If there are no more slots, expire the oldest */
1465 list_del(&oldest->list);
1466 target = oldest;
1467 IEEE80211_DEBUG_SCAN("Expired '%s' (%pM) from "
1468 "network list.\n",
1469 escape_essid(target->ssid,
1470 target->ssid_len),
1471 target->bssid);
1472 } else {
1473 /* Otherwise just pull from the free list */
1474 target = list_entry(ieee->network_free_list.next,
1475 struct ieee80211_network, list);
1476 list_del(ieee->network_free_list.next);
1477 }
1478
1479
1480 #ifdef CONFIG_IEEE80211_DEBUG
1481 IEEE80211_DEBUG_SCAN("Adding '%s' (%pM) via %s.\n",
1482 escape_essid(network.ssid,
1483 network.ssid_len),
1484 network.bssid,
1485 WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
1486 IEEE80211_STYPE_PROBE_RESP ?
1487 "PROBE RESPONSE" : "BEACON");
1488 #endif
1489
1490 memcpy(target, &network, sizeof(*target));
1491 list_add_tail(&target->list, &ieee->network_list);
1492 } else {
1493 IEEE80211_DEBUG_SCAN("Updating '%s' (%pM) via %s.\n",
1494 escape_essid(target->ssid,
1495 target->ssid_len),
1496 target->bssid,
1497 WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
1498 IEEE80211_STYPE_PROBE_RESP ?
1499 "PROBE RESPONSE" : "BEACON");
1500
1501 /* we have an entry and we are going to update it. But this entry may
1502 * be already expired. In this case we do the same as we found a new
1503 * net and call the new_net handler
1504 */
1505 renew = !time_after(target->last_scanned + ieee->scan_age, jiffies);
1506 //YJ,add,080819,for hidden ap
1507 if(is_beacon == 0)
1508 network.flags = (~NETWORK_EMPTY_ESSID & network.flags)|(NETWORK_EMPTY_ESSID & target->flags);
1509 //if(strncmp(network.ssid, "linksys-c",9) == 0)
1510 // printk("====>2 network.ssid=%s FLAG=%d target.ssid=%s FLAG=%d\n", network.ssid, network.flags, target->ssid, target->flags);
1511 if(((network.flags & NETWORK_EMPTY_ESSID) == NETWORK_EMPTY_ESSID) \
1512 && (((network.ssid_len > 0) && (strncmp(target->ssid, network.ssid, network.ssid_len)))\
1513 ||((ieee->current_network.ssid_len == network.ssid_len)&&(strncmp(ieee->current_network.ssid, network.ssid, network.ssid_len) == 0)&&(ieee->state == IEEE80211_NOLINK))))
1514 renew = 1;
1515 //YJ,add,080819,for hidden ap,end
1516 update_network(target, &network);
1517 }
1518
1519 spin_unlock_irqrestore(&ieee->lock, flags);
1520 }
1521
ieee80211_rx_mgt(struct ieee80211_device * ieee,struct ieee80211_hdr_4addr * header,struct ieee80211_rx_stats * stats)1522 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1523 struct ieee80211_hdr_4addr *header,
1524 struct ieee80211_rx_stats *stats)
1525 {
1526 switch (WLAN_FC_GET_STYPE(header->frame_ctl)) {
1527
1528 case IEEE80211_STYPE_BEACON:
1529 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1530 WLAN_FC_GET_STYPE(header->frame_ctl));
1531 IEEE80211_DEBUG_SCAN("Beacon\n");
1532 ieee80211_process_probe_response(
1533 ieee, (struct ieee80211_probe_response *)header, stats);
1534 break;
1535
1536 case IEEE80211_STYPE_PROBE_RESP:
1537 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1538 WLAN_FC_GET_STYPE(header->frame_ctl));
1539 IEEE80211_DEBUG_SCAN("Probe response\n");
1540 ieee80211_process_probe_response(
1541 ieee, (struct ieee80211_probe_response *)header, stats);
1542 break;
1543 }
1544 }
1545