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/drivers/staging/rtl8187se/ieee80211/ieee80211_rx.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 1544 lines | 1156 code | 190 blank | 198 comment | 279 complexity | 4bc1cf794fcf1f615d5489aef1c86fe6 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
   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"
  47static 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) */
  66static struct ieee80211_frag_entry *
  67ieee80211_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) */
  96static struct sk_buff *
  97ieee80211_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) */
 166static 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 */
 212static inline int
 213ieee80211_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) */
 247static unsigned char rfc1042_header[] =
 248{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 249/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 250static 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 */
 255static 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 */
 296static inline int
 297ieee80211_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 */
 341static inline int
 342ieee80211_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)
 370static 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
 461drop:
 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). */
 472int 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
 794static 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
 810static 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
 866static 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
 899int
 900ieee80211_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}
 912inline 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&param 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
1218static 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
1238inline 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
1325inline 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
1522void 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}