libipw_rx.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Original code based Host AP (software wireless LAN access point) driver
   4 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
   5 *
   6 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   7 * <j@w1.fi>
   8 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
   9 * Copyright (c) 2004-2005, Intel Corporation
  10 */
  11
  12#include <linux/compiler.h>
  13#include <linux/errno.h>
  14#include <linux/if_arp.h>
  15#include <linux/in6.h>
  16#include <linux/gfp.h>
  17#include <linux/in.h>
  18#include <linux/ip.h>
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/netdevice.h>
  22#include <linux/proc_fs.h>
  23#include <linux/skbuff.h>
  24#include <linux/tcp.h>
  25#include <linux/types.h>
  26#include <linux/wireless.h>
  27#include <linux/etherdevice.h>
  28#include <linux/uaccess.h>
  29#include <linux/ctype.h>
  30#include "libipw.h"
  31
  32static void libipw_monitor_rx(struct libipw_device *ieee,
  33					struct sk_buff *skb,
  34					struct libipw_rx_stats *rx_stats)
  35{
  36	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  37	u16 fc = le16_to_cpu(hdr->frame_control);
  38
  39	skb->dev = ieee->dev;
  40	skb_reset_mac_header(skb);
  41	skb_pull(skb, libipw_get_hdrlen(fc));
  42	skb->pkt_type = PACKET_OTHERHOST;
  43	skb->protocol = htons(ETH_P_80211_RAW);
  44	memset(skb->cb, 0, sizeof(skb->cb));
  45	netif_rx(skb);
  46}
  47
  48/* Called only as a tasklet (software IRQ) */
  49static struct libipw_frag_entry *libipw_frag_cache_find(struct
  50							      libipw_device
  51							      *ieee,
  52							      unsigned int seq,
  53							      unsigned int frag,
  54							      u8 * src,
  55							      u8 * dst)
  56{
  57	struct libipw_frag_entry *entry;
  58	int i;
  59
  60	for (i = 0; i < LIBIPW_FRAG_CACHE_LEN; i++) {
  61		entry = &ieee->frag_cache[i];
  62		if (entry->skb != NULL &&
  63		    time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
  64			LIBIPW_DEBUG_FRAG("expiring fragment cache entry "
  65					     "seq=%u last_frag=%u\n",
  66					     entry->seq, entry->last_frag);
  67			dev_kfree_skb_any(entry->skb);
  68			entry->skb = NULL;
  69		}
  70
  71		if (entry->skb != NULL && entry->seq == seq &&
  72		    (entry->last_frag + 1 == frag || frag == -1) &&
  73		    ether_addr_equal(entry->src_addr, src) &&
  74		    ether_addr_equal(entry->dst_addr, dst))
  75			return entry;
  76	}
  77
  78	return NULL;
  79}
  80
  81/* Called only as a tasklet (software IRQ) */
  82static struct sk_buff *libipw_frag_cache_get(struct libipw_device *ieee,
  83						struct libipw_hdr_4addr *hdr)
  84{
  85	struct sk_buff *skb = NULL;
  86	u16 sc;
  87	unsigned int frag, seq;
  88	struct libipw_frag_entry *entry;
  89
  90	sc = le16_to_cpu(hdr->seq_ctl);
  91	frag = WLAN_GET_SEQ_FRAG(sc);
  92	seq = WLAN_GET_SEQ_SEQ(sc);
  93
  94	if (frag == 0) {
  95		/* Reserve enough space to fit maximum frame length */
  96		skb = dev_alloc_skb(ieee->dev->mtu +
  97				    sizeof(struct libipw_hdr_4addr) +
  98				    8 /* LLC */  +
  99				    2 /* alignment */  +
 100				    8 /* WEP */  + ETH_ALEN /* WDS */ );
 101		if (skb == NULL)
 102			return NULL;
 103
 104		entry = &ieee->frag_cache[ieee->frag_next_idx];
 105		ieee->frag_next_idx++;
 106		if (ieee->frag_next_idx >= LIBIPW_FRAG_CACHE_LEN)
 107			ieee->frag_next_idx = 0;
 108
 109		if (entry->skb != NULL)
 110			dev_kfree_skb_any(entry->skb);
 111
 112		entry->first_frag_time = jiffies;
 113		entry->seq = seq;
 114		entry->last_frag = frag;
 115		entry->skb = skb;
 116		memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
 117		memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
 118	} else {
 119		/* received a fragment of a frame for which the head fragment
 120		 * should have already been received */
 121		entry = libipw_frag_cache_find(ieee, seq, frag, hdr->addr2,
 122						  hdr->addr1);
 123		if (entry != NULL) {
 124			entry->last_frag = frag;
 125			skb = entry->skb;
 126		}
 127	}
 128
 129	return skb;
 130}
 131
 132/* Called only as a tasklet (software IRQ) */
 133static int libipw_frag_cache_invalidate(struct libipw_device *ieee,
 134					   struct libipw_hdr_4addr *hdr)
 135{
 136	u16 sc;
 137	unsigned int seq;
 138	struct libipw_frag_entry *entry;
 139
 140	sc = le16_to_cpu(hdr->seq_ctl);
 141	seq = WLAN_GET_SEQ_SEQ(sc);
 142
 143	entry = libipw_frag_cache_find(ieee, seq, -1, hdr->addr2,
 144					  hdr->addr1);
 145
 146	if (entry == NULL) {
 147		LIBIPW_DEBUG_FRAG("could not invalidate fragment cache "
 148				     "entry (seq=%u)\n", seq);
 149		return -1;
 150	}
 151
 152	entry->skb = NULL;
 153	return 0;
 154}
 155
 156#ifdef NOT_YET
 157/* libipw_rx_frame_mgtmt
 158 *
 159 * Responsible for handling management control frames
 160 *
 161 * Called by libipw_rx */
 162static int
 163libipw_rx_frame_mgmt(struct libipw_device *ieee, struct sk_buff *skb,
 164			struct libipw_rx_stats *rx_stats, u16 type,
 165			u16 stype)
 166{
 167	if (ieee->iw_mode == IW_MODE_MASTER) {
 168		printk(KERN_DEBUG "%s: Master mode not yet supported.\n",
 169		       ieee->dev->name);
 170		return 0;
 171/*
 172  hostap_update_sta_ps(ieee, (struct hostap_libipw_hdr_4addr *)
 173  skb->data);*/
 174	}
 175
 176	if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
 177		if (stype == WLAN_FC_STYPE_BEACON &&
 178		    ieee->iw_mode == IW_MODE_MASTER) {
 179			struct sk_buff *skb2;
 180			/* Process beacon frames also in kernel driver to
 181			 * update STA(AP) table statistics */
 182			skb2 = skb_clone(skb, GFP_ATOMIC);
 183			if (skb2)
 184				hostap_rx(skb2->dev, skb2, rx_stats);
 185		}
 186
 187		/* send management frames to the user space daemon for
 188		 * processing */
 189		ieee->apdevstats.rx_packets++;
 190		ieee->apdevstats.rx_bytes += skb->len;
 191		prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
 192		return 0;
 193	}
 194
 195	if (ieee->iw_mode == IW_MODE_MASTER) {
 196		if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
 197			printk(KERN_DEBUG "%s: unknown management frame "
 198			       "(type=0x%02x, stype=0x%02x) dropped\n",
 199			       skb->dev->name, type, stype);
 200			return -1;
 201		}
 202
 203		hostap_rx(skb->dev, skb, rx_stats);
 204		return 0;
 205	}
 206
 207	printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
 208	       "received in non-Host AP mode\n", skb->dev->name);
 209	return -1;
 210}
 211#endif
 212
 213/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
 214/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
 215static unsigned char libipw_rfc1042_header[] =
 216    { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
 217
 218/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
 219static unsigned char libipw_bridge_tunnel_header[] =
 220    { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
 221/* No encapsulation header if EtherType < 0x600 (=length) */
 222
 223/* Called by libipw_rx_frame_decrypt */
 224static int libipw_is_eapol_frame(struct libipw_device *ieee,
 225				    struct sk_buff *skb)
 226{
 227	struct net_device *dev = ieee->dev;
 228	u16 fc, ethertype;
 229	struct libipw_hdr_3addr *hdr;
 230	u8 *pos;
 231
 232	if (skb->len < 24)
 233		return 0;
 234
 235	hdr = (struct libipw_hdr_3addr *)skb->data;
 236	fc = le16_to_cpu(hdr->frame_ctl);
 237
 238	/* check that the frame is unicast frame to us */
 239	if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 240	    IEEE80211_FCTL_TODS &&
 241	    ether_addr_equal(hdr->addr1, dev->dev_addr) &&
 242	    ether_addr_equal(hdr->addr3, dev->dev_addr)) {
 243		/* ToDS frame with own addr BSSID and DA */
 244	} else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 245		   IEEE80211_FCTL_FROMDS &&
 246		   ether_addr_equal(hdr->addr1, dev->dev_addr)) {
 247		/* FromDS frame with own addr as DA */
 248	} else
 249		return 0;
 250
 251	if (skb->len < 24 + 8)
 252		return 0;
 253
 254	/* check for port access entity Ethernet type */
 255	pos = skb->data + 24;
 256	ethertype = (pos[6] << 8) | pos[7];
 257	if (ethertype == ETH_P_PAE)
 258		return 1;
 259
 260	return 0;
 261}
 262
 263/* Called only as a tasklet (software IRQ), by libipw_rx */
 264static int
 265libipw_rx_frame_decrypt(struct libipw_device *ieee, struct sk_buff *skb,
 266			   struct libipw_crypt_data *crypt)
 267{
 268	struct libipw_hdr_3addr *hdr;
 269	int res, hdrlen;
 270
 271	if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 272		return 0;
 273
 274	hdr = (struct libipw_hdr_3addr *)skb->data;
 275	hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 276
 277	atomic_inc(&crypt->refcnt);
 278	res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 279	atomic_dec(&crypt->refcnt);
 280	if (res < 0) {
 281		LIBIPW_DEBUG_DROP("decryption failed (SA=%pM) res=%d\n",
 282				     hdr->addr2, res);
 283		if (res == -2)
 284			LIBIPW_DEBUG_DROP("Decryption failed ICV "
 285					     "mismatch (key %d)\n",
 286					     skb->data[hdrlen + 3] >> 6);
 287		ieee->ieee_stats.rx_discards_undecryptable++;
 288		return -1;
 289	}
 290
 291	return res;
 292}
 293
 294/* Called only as a tasklet (software IRQ), by libipw_rx */
 295static int
 296libipw_rx_frame_decrypt_msdu(struct libipw_device *ieee,
 297				struct sk_buff *skb, int keyidx,
 298				struct libipw_crypt_data *crypt)
 299{
 300	struct libipw_hdr_3addr *hdr;
 301	int res, hdrlen;
 302
 303	if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
 304		return 0;
 305
 306	hdr = (struct libipw_hdr_3addr *)skb->data;
 307	hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 308
 309	atomic_inc(&crypt->refcnt);
 310	res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
 311	atomic_dec(&crypt->refcnt);
 312	if (res < 0) {
 313		printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
 314		       " (SA=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2,
 315		       keyidx);
 316		return -1;
 317	}
 318
 319	return 0;
 320}
 321
 322/* All received frames are sent to this function. @skb contains the frame in
 323 * IEEE 802.11 format, i.e., in the format it was sent over air.
 324 * This function is called only as a tasklet (software IRQ). */
 325int libipw_rx(struct libipw_device *ieee, struct sk_buff *skb,
 326		 struct libipw_rx_stats *rx_stats)
 327{
 328	struct net_device *dev = ieee->dev;
 329	struct libipw_hdr_4addr *hdr;
 330	size_t hdrlen;
 331	u16 fc, type, stype, sc;
 332	unsigned int frag;
 333	u8 *payload;
 334	u16 ethertype;
 335#ifdef NOT_YET
 336	struct net_device *wds = NULL;
 337	struct sk_buff *skb2 = NULL;
 338	struct net_device *wds = NULL;
 339	int frame_authorized = 0;
 340	int from_assoc_ap = 0;
 341	void *sta = NULL;
 342#endif
 343	u8 dst[ETH_ALEN];
 344	u8 src[ETH_ALEN];
 345	struct libipw_crypt_data *crypt = NULL;
 346	int keyidx = 0;
 347	int can_be_decrypted = 0;
 348
 349	hdr = (struct libipw_hdr_4addr *)skb->data;
 350	if (skb->len < 10) {
 351		printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
 352		goto rx_dropped;
 353	}
 354
 355	fc = le16_to_cpu(hdr->frame_ctl);
 356	type = WLAN_FC_GET_TYPE(fc);
 357	stype = WLAN_FC_GET_STYPE(fc);
 358	sc = le16_to_cpu(hdr->seq_ctl);
 359	frag = WLAN_GET_SEQ_FRAG(sc);
 360	hdrlen = libipw_get_hdrlen(fc);
 361
 362	if (skb->len < hdrlen) {
 363		printk(KERN_INFO "%s: invalid SKB length %d\n",
 364			dev->name, skb->len);
 365		goto rx_dropped;
 366	}
 367
 368	/* Put this code here so that we avoid duplicating it in all
 369	 * Rx paths. - Jean II */
 370#ifdef CONFIG_WIRELESS_EXT
 371#ifdef IW_WIRELESS_SPY		/* defined in iw_handler.h */
 372	/* If spy monitoring on */
 373	if (ieee->spy_data.spy_number > 0) {
 374		struct iw_quality wstats;
 375
 376		wstats.updated = 0;
 377		if (rx_stats->mask & LIBIPW_STATMASK_RSSI) {
 378			wstats.level = rx_stats->signal;
 379			wstats.updated |= IW_QUAL_LEVEL_UPDATED;
 380		} else
 381			wstats.updated |= IW_QUAL_LEVEL_INVALID;
 382
 383		if (rx_stats->mask & LIBIPW_STATMASK_NOISE) {
 384			wstats.noise = rx_stats->noise;
 385			wstats.updated |= IW_QUAL_NOISE_UPDATED;
 386		} else
 387			wstats.updated |= IW_QUAL_NOISE_INVALID;
 388
 389		if (rx_stats->mask & LIBIPW_STATMASK_SIGNAL) {
 390			wstats.qual = rx_stats->signal;
 391			wstats.updated |= IW_QUAL_QUAL_UPDATED;
 392		} else
 393			wstats.updated |= IW_QUAL_QUAL_INVALID;
 394
 395		/* Update spy records */
 396		libipw_spy_update(ieee->dev, hdr->addr2, &wstats);
 397	}
 398#endif				/* IW_WIRELESS_SPY */
 399#endif				/* CONFIG_WIRELESS_EXT */
 400
 401#ifdef NOT_YET
 402	hostap_update_rx_stats(local->ap, hdr, rx_stats);
 403#endif
 404
 405	if (ieee->iw_mode == IW_MODE_MONITOR) {
 406		dev->stats.rx_packets++;
 407		dev->stats.rx_bytes += skb->len;
 408		libipw_monitor_rx(ieee, skb, rx_stats);
 409		return 1;
 410	}
 411
 412	can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
 413			    is_broadcast_ether_addr(hdr->addr2)) ?
 414	    ieee->host_mc_decrypt : ieee->host_decrypt;
 415
 416	if (can_be_decrypted) {
 417		if (skb->len >= hdrlen + 3) {
 418			/* Top two-bits of byte 3 are the key index */
 419			keyidx = skb->data[hdrlen + 3] >> 6;
 420		}
 421
 422		/* ieee->crypt[] is WEP_KEY (4) in length.  Given that keyidx
 423		 * is only allowed 2-bits of storage, no value of keyidx can
 424		 * be provided via above code that would result in keyidx
 425		 * being out of range */
 426		crypt = ieee->crypt_info.crypt[keyidx];
 427
 428#ifdef NOT_YET
 429		sta = NULL;
 430
 431		/* Use station specific key to override default keys if the
 432		 * receiver address is a unicast address ("individual RA"). If
 433		 * bcrx_sta_key parameter is set, station specific key is used
 434		 * even with broad/multicast targets (this is against IEEE
 435		 * 802.11, but makes it easier to use different keys with
 436		 * stations that do not support WEP key mapping). */
 437
 438		if (is_unicast_ether_addr(hdr->addr1) || local->bcrx_sta_key)
 439			(void)hostap_handle_sta_crypto(local, hdr, &crypt,
 440						       &sta);
 441#endif
 442
 443		/* allow NULL decrypt to indicate an station specific override
 444		 * for default encryption */
 445		if (crypt && (crypt->ops == NULL ||
 446			      crypt->ops->decrypt_mpdu == NULL))
 447			crypt = NULL;
 448
 449		if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
 450			/* This seems to be triggered by some (multicast?)
 451			 * frames from other than current BSS, so just drop the
 452			 * frames silently instead of filling system log with
 453			 * these reports. */
 454			LIBIPW_DEBUG_DROP("Decryption failed (not set)"
 455					     " (SA=%pM)\n", hdr->addr2);
 456			ieee->ieee_stats.rx_discards_undecryptable++;
 457			goto rx_dropped;
 458		}
 459	}
 460#ifdef NOT_YET
 461	if (type != WLAN_FC_TYPE_DATA) {
 462		if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
 463		    fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
 464		    (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
 465			printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
 466			       "from %pM\n", dev->name, hdr->addr2);
 467			/* TODO: could inform hostapd about this so that it
 468			 * could send auth failure report */
 469			goto rx_dropped;
 470		}
 471
 472		if (libipw_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
 473			goto rx_dropped;
 474		else
 475			goto rx_exit;
 476	}
 477#endif
 478	/* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
 479	if (sc == ieee->prev_seq_ctl)
 480		goto rx_dropped;
 481	else
 482		ieee->prev_seq_ctl = sc;
 483
 484	/* Data frame - extract src/dst addresses */
 485	if (skb->len < LIBIPW_3ADDR_LEN)
 486		goto rx_dropped;
 487
 488	switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
 489	case IEEE80211_FCTL_FROMDS:
 490		memcpy(dst, hdr->addr1, ETH_ALEN);
 491		memcpy(src, hdr->addr3, ETH_ALEN);
 492		break;
 493	case IEEE80211_FCTL_TODS:
 494		memcpy(dst, hdr->addr3, ETH_ALEN);
 495		memcpy(src, hdr->addr2, ETH_ALEN);
 496		break;
 497	case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
 498		if (skb->len < LIBIPW_4ADDR_LEN)
 499			goto rx_dropped;
 500		memcpy(dst, hdr->addr3, ETH_ALEN);
 501		memcpy(src, hdr->addr4, ETH_ALEN);
 502		break;
 503	default:
 504		memcpy(dst, hdr->addr1, ETH_ALEN);
 505		memcpy(src, hdr->addr2, ETH_ALEN);
 506		break;
 507	}
 508
 509#ifdef NOT_YET
 510	if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
 511		goto rx_dropped;
 512	if (wds) {
 513		skb->dev = dev = wds;
 514		stats = hostap_get_stats(dev);
 515	}
 516
 517	if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
 518	    (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 519	    IEEE80211_FCTL_FROMDS && ieee->stadev &&
 520	    ether_addr_equal(hdr->addr2, ieee->assoc_ap_addr)) {
 521		/* Frame from BSSID of the AP for which we are a client */
 522		skb->dev = dev = ieee->stadev;
 523		stats = hostap_get_stats(dev);
 524		from_assoc_ap = 1;
 525	}
 526#endif
 527
 528#ifdef NOT_YET
 529	if ((ieee->iw_mode == IW_MODE_MASTER ||
 530	     ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
 531		switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
 532					     wds != NULL)) {
 533		case AP_RX_CONTINUE_NOT_AUTHORIZED:
 534			frame_authorized = 0;
 535			break;
 536		case AP_RX_CONTINUE:
 537			frame_authorized = 1;
 538			break;
 539		case AP_RX_DROP:
 540			goto rx_dropped;
 541		case AP_RX_EXIT:
 542			goto rx_exit;
 543		}
 544	}
 545#endif
 546
 547	/* Nullfunc frames may have PS-bit set, so they must be passed to
 548	 * hostap_handle_sta_rx() before being dropped here. */
 549
 550	stype &= ~IEEE80211_STYPE_QOS_DATA;
 551
 552	if (stype != IEEE80211_STYPE_DATA &&
 553	    stype != IEEE80211_STYPE_DATA_CFACK &&
 554	    stype != IEEE80211_STYPE_DATA_CFPOLL &&
 555	    stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
 556		if (stype != IEEE80211_STYPE_NULLFUNC)
 557			LIBIPW_DEBUG_DROP("RX: dropped data frame "
 558					     "with no data (type=0x%02x, "
 559					     "subtype=0x%02x, len=%d)\n",
 560					     type, stype, skb->len);
 561		goto rx_dropped;
 562	}
 563
 564	/* skb: hdr + (possibly fragmented, possibly encrypted) payload */
 565
 566	if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
 567	    (keyidx = libipw_rx_frame_decrypt(ieee, skb, crypt)) < 0)
 568		goto rx_dropped;
 569
 570	hdr = (struct libipw_hdr_4addr *)skb->data;
 571
 572	/* skb: hdr + (possibly fragmented) plaintext payload */
 573	// PR: FIXME: hostap has additional conditions in the "if" below:
 574	// ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
 575	if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
 576		int flen;
 577		struct sk_buff *frag_skb = libipw_frag_cache_get(ieee, hdr);
 578		LIBIPW_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
 579
 580		if (!frag_skb) {
 581			LIBIPW_DEBUG(LIBIPW_DL_RX | LIBIPW_DL_FRAG,
 582					"Rx cannot get skb from fragment "
 583					"cache (morefrag=%d seq=%u frag=%u)\n",
 584					(fc & IEEE80211_FCTL_MOREFRAGS) != 0,
 585					WLAN_GET_SEQ_SEQ(sc), frag);
 586			goto rx_dropped;
 587		}
 588
 589		flen = skb->len;
 590		if (frag != 0)
 591			flen -= hdrlen;
 592
 593		if (frag_skb->tail + flen > frag_skb->end) {
 594			printk(KERN_WARNING "%s: host decrypted and "
 595			       "reassembled frame did not fit skb\n",
 596			       dev->name);
 597			libipw_frag_cache_invalidate(ieee, hdr);
 598			goto rx_dropped;
 599		}
 600
 601		if (frag == 0) {
 602			/* copy first fragment (including full headers) into
 603			 * beginning of the fragment cache skb */
 604			skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);
 605		} else {
 606			/* append frame payload to the end of the fragment
 607			 * cache skb */
 608			skb_copy_from_linear_data_offset(skb, hdrlen,
 609				      skb_put(frag_skb, flen), flen);
 610		}
 611		dev_kfree_skb_any(skb);
 612		skb = NULL;
 613
 614		if (fc & IEEE80211_FCTL_MOREFRAGS) {
 615			/* more fragments expected - leave the skb in fragment
 616			 * cache for now; it will be delivered to upper layers
 617			 * after all fragments have been received */
 618			goto rx_exit;
 619		}
 620
 621		/* this was the last fragment and the frame will be
 622		 * delivered, so remove skb from fragment cache */
 623		skb = frag_skb;
 624		hdr = (struct libipw_hdr_4addr *)skb->data;
 625		libipw_frag_cache_invalidate(ieee, hdr);
 626	}
 627
 628	/* skb: hdr + (possible reassembled) full MSDU payload; possibly still
 629	 * encrypted/authenticated */
 630	if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
 631	    libipw_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
 632		goto rx_dropped;
 633
 634	hdr = (struct libipw_hdr_4addr *)skb->data;
 635	if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
 636		if (		/*ieee->ieee802_1x && */
 637			   libipw_is_eapol_frame(ieee, skb)) {
 638			/* pass unencrypted EAPOL frames even if encryption is
 639			 * configured */
 640		} else {
 641			LIBIPW_DEBUG_DROP("encryption configured, but RX "
 642					     "frame not encrypted (SA=%pM)\n",
 643					     hdr->addr2);
 644			goto rx_dropped;
 645		}
 646	}
 647
 648	if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
 649	    !libipw_is_eapol_frame(ieee, skb)) {
 650		LIBIPW_DEBUG_DROP("dropped unencrypted RX data "
 651				     "frame from %pM (drop_unencrypted=1)\n",
 652				     hdr->addr2);
 653		goto rx_dropped;
 654	}
 655
 656	/* If the frame was decrypted in hardware, we may need to strip off
 657	 * any security data (IV, ICV, etc) that was left behind */
 658	if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&
 659	    ieee->host_strip_iv_icv) {
 660		int trimlen = 0;
 661
 662		/* Top two-bits of byte 3 are the key index */
 663		if (skb->len >= hdrlen + 3)
 664			keyidx = skb->data[hdrlen + 3] >> 6;
 665
 666		/* To strip off any security data which appears before the
 667		 * payload, we simply increase hdrlen (as the header gets
 668		 * chopped off immediately below). For the security data which
 669		 * appears after the payload, we use skb_trim. */
 670
 671		switch (ieee->sec.encode_alg[keyidx]) {
 672		case SEC_ALG_WEP:
 673			/* 4 byte IV */
 674			hdrlen += 4;
 675			/* 4 byte ICV */
 676			trimlen = 4;
 677			break;
 678		case SEC_ALG_TKIP:
 679			/* 4 byte IV, 4 byte ExtIV */
 680			hdrlen += 8;
 681			/* 8 byte MIC, 4 byte ICV */
 682			trimlen = 12;
 683			break;
 684		case SEC_ALG_CCMP:
 685			/* 8 byte CCMP header */
 686			hdrlen += 8;
 687			/* 8 byte MIC */
 688			trimlen = 8;
 689			break;
 690		}
 691
 692		if (skb->len < trimlen)
 693			goto rx_dropped;
 694
 695		__skb_trim(skb, skb->len - trimlen);
 696
 697		if (skb->len < hdrlen)
 698			goto rx_dropped;
 699	}
 700
 701	/* skb: hdr + (possible reassembled) full plaintext payload */
 702
 703	payload = skb->data + hdrlen;
 704	ethertype = (payload[6] << 8) | payload[7];
 705
 706#ifdef NOT_YET
 707	/* If IEEE 802.1X is used, check whether the port is authorized to send
 708	 * the received frame. */
 709	if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
 710		if (ethertype == ETH_P_PAE) {
 711			printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
 712			       dev->name);
 713			if (ieee->hostapd && ieee->apdev) {
 714				/* Send IEEE 802.1X frames to the user
 715				 * space daemon for processing */
 716				prism2_rx_80211(ieee->apdev, skb, rx_stats,
 717						PRISM2_RX_MGMT);
 718				ieee->apdevstats.rx_packets++;
 719				ieee->apdevstats.rx_bytes += skb->len;
 720				goto rx_exit;
 721			}
 722		} else if (!frame_authorized) {
 723			printk(KERN_DEBUG "%s: dropped frame from "
 724			       "unauthorized port (IEEE 802.1X): "
 725			       "ethertype=0x%04x\n", dev->name, ethertype);
 726			goto rx_dropped;
 727		}
 728	}
 729#endif
 730
 731	/* convert hdr + possible LLC headers into Ethernet header */
 732	if (skb->len - hdrlen >= 8 &&
 733	    ((memcmp(payload, libipw_rfc1042_header, SNAP_SIZE) == 0 &&
 734	      ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 735	     memcmp(payload, libipw_bridge_tunnel_header, SNAP_SIZE) == 0)) {
 736		/* remove RFC1042 or Bridge-Tunnel encapsulation and
 737		 * replace EtherType */
 738		skb_pull(skb, hdrlen + SNAP_SIZE);
 739		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 740		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 741	} else {
 742		__be16 len;
 743		/* Leave Ethernet header part of hdr and full payload */
 744		skb_pull(skb, hdrlen);
 745		len = htons(skb->len);
 746		memcpy(skb_push(skb, 2), &len, 2);
 747		memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 748		memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 749	}
 750
 751#ifdef NOT_YET
 752	if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
 753		    IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
 754		/* Non-standard frame: get addr4 from its bogus location after
 755		 * the payload */
 756		skb_copy_to_linear_data_offset(skb, ETH_ALEN,
 757					       skb->data + skb->len - ETH_ALEN,
 758					       ETH_ALEN);
 759		skb_trim(skb, skb->len - ETH_ALEN);
 760	}
 761#endif
 762
 763	dev->stats.rx_packets++;
 764	dev->stats.rx_bytes += skb->len;
 765
 766#ifdef NOT_YET
 767	if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
 768		if (is_multicast_ether_addr(dst)) {
 769			/* copy multicast frame both to the higher layers and
 770			 * to the wireless media */
 771			ieee->ap->bridged_multicast++;
 772			skb2 = skb_clone(skb, GFP_ATOMIC);
 773			if (skb2 == NULL)
 774				printk(KERN_DEBUG "%s: skb_clone failed for "
 775				       "multicast frame\n", dev->name);
 776		} else if (hostap_is_sta_assoc(ieee->ap, dst)) {
 777			/* send frame directly to the associated STA using
 778			 * wireless media and not passing to higher layers */
 779			ieee->ap->bridged_unicast++;
 780			skb2 = skb;
 781			skb = NULL;
 782		}
 783	}
 784
 785	if (skb2 != NULL) {
 786		/* send to wireless media */
 787		skb2->dev = dev;
 788		skb2->protocol = htons(ETH_P_802_3);
 789		skb_reset_mac_header(skb2);
 790		skb_reset_network_header(skb2);
 791		/* skb2->network_header += ETH_HLEN; */
 792		dev_queue_xmit(skb2);
 793	}
 794#endif
 795
 796	if (skb) {
 797		skb->protocol = eth_type_trans(skb, dev);
 798		memset(skb->cb, 0, sizeof(skb->cb));
 799		skb->ip_summed = CHECKSUM_NONE;	/* 802.11 crc not sufficient */
 800		if (netif_rx(skb) == NET_RX_DROP) {
 801			/* netif_rx always succeeds, but it might drop
 802			 * the packet.  If it drops the packet, we log that
 803			 * in our stats. */
 804			LIBIPW_DEBUG_DROP
 805			    ("RX: netif_rx dropped the packet\n");
 806			dev->stats.rx_dropped++;
 807		}
 808	}
 809
 810      rx_exit:
 811#ifdef NOT_YET
 812	if (sta)
 813		hostap_handle_sta_release(sta);
 814#endif
 815	return 1;
 816
 817      rx_dropped:
 818	dev->stats.rx_dropped++;
 819
 820	/* Returning 0 indicates to caller that we have not handled the SKB--
 821	 * so it is still allocated and can be used again by underlying
 822	 * hardware as a DMA target */
 823	return 0;
 824}
 825
 826#define MGMT_FRAME_FIXED_PART_LENGTH		0x24
 827
 828static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
 829
 830/*
 831* Make the structure we read from the beacon packet to have
 832* the right values
 833*/
 834static int libipw_verify_qos_info(struct libipw_qos_information_element
 835				     *info_element, int sub_type)
 836{
 837	if (info_element->elementID != QOS_ELEMENT_ID)
 838		return -1;
 839	if (info_element->qui_subtype != sub_type)
 840		return -1;
 841	if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
 842		return -1;
 843	if (info_element->qui_type != QOS_OUI_TYPE)
 844		return -1;
 845	if (info_element->version != QOS_VERSION_1)
 846		return -1;
 847
 848	return 0;
 849}
 850
 851/*
 852 * Parse a QoS parameter element
 853 */
 854static int libipw_read_qos_param_element(
 855			struct libipw_qos_parameter_info *element_param,
 856			struct libipw_info_element *info_element)
 857{
 858	size_t size = sizeof(*element_param);
 859
 860	if (!element_param || !info_element || info_element->len != size - 2)
 861		return -1;
 862
 863	memcpy(element_param, info_element, size);
 864	return libipw_verify_qos_info(&element_param->info_element,
 865				      QOS_OUI_PARAM_SUB_TYPE);
 866}
 867
 868/*
 869 * Parse a QoS information element
 870 */
 871static int libipw_read_qos_info_element(
 872			struct libipw_qos_information_element *element_info,
 873			struct libipw_info_element *info_element)
 874{
 875	size_t size = sizeof(struct libipw_qos_information_element) - 2;
 876
 877	if (!element_info || !info_element || info_element->len != size - 2)
 878		return -1;
 879
 880	memcpy(element_info, info_element, size);
 881	return libipw_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
 882}
 883
 884/*
 885 * Write QoS parameters from the ac parameters.
 886 */
 887static void libipw_qos_convert_ac_to_parameters(struct
 888						  libipw_qos_parameter_info
 889						  *param_elm, struct
 890						  libipw_qos_parameters
 891						  *qos_param)
 892{
 893	int i;
 894	struct libipw_qos_ac_parameter *ac_params;
 895	u32 txop;
 896	u8 cw_min;
 897	u8 cw_max;
 898
 899	for (i = 0; i < QOS_QUEUE_NUM; i++) {
 900		ac_params = &(param_elm->ac_params_record[i]);
 901
 902		qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
 903		qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
 904
 905		cw_min = ac_params->ecw_min_max & 0x0F;
 906		qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1);
 907
 908		cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
 909		qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1);
 910
 911		qos_param->flag[i] =
 912		    (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
 913
 914		txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
 915		qos_param->tx_op_limit[i] = cpu_to_le16(txop);
 916	}
 917}
 918
 919/*
 920 * we have a generic data element which it may contain QoS information or
 921 * parameters element. check the information element length to decide
 922 * which type to read
 923 */
 924static int libipw_parse_qos_info_param_IE(struct libipw_info_element
 925					     *info_element,
 926					     struct libipw_network *network)
 927{
 928	int rc = 0;
 929	struct libipw_qos_parameters *qos_param = NULL;
 930	struct libipw_qos_information_element qos_info_element;
 931
 932	rc = libipw_read_qos_info_element(&qos_info_element, info_element);
 933
 934	if (rc == 0) {
 935		network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
 936		network->flags |= NETWORK_HAS_QOS_INFORMATION;
 937	} else {
 938		struct libipw_qos_parameter_info param_element;
 939
 940		rc = libipw_read_qos_param_element(&param_element,
 941						      info_element);
 942		if (rc == 0) {
 943			qos_param = &(network->qos_data.parameters);
 944			libipw_qos_convert_ac_to_parameters(&param_element,
 945							       qos_param);
 946			network->flags |= NETWORK_HAS_QOS_PARAMETERS;
 947			network->qos_data.param_count =
 948			    param_element.info_element.ac_info & 0x0F;
 949		}
 950	}
 951
 952	if (rc == 0) {
 953		LIBIPW_DEBUG_QOS("QoS is supported\n");
 954		network->qos_data.supported = 1;
 955	}
 956	return rc;
 957}
 958
 959#ifdef CONFIG_LIBIPW_DEBUG
 960#define MFIE_STRING(x) case WLAN_EID_ ##x: return #x
 961
 962static const char *get_info_element_string(u16 id)
 963{
 964	switch (id) {
 965		MFIE_STRING(SSID);
 966		MFIE_STRING(SUPP_RATES);
 967		MFIE_STRING(FH_PARAMS);
 968		MFIE_STRING(DS_PARAMS);
 969		MFIE_STRING(CF_PARAMS);
 970		MFIE_STRING(TIM);
 971		MFIE_STRING(IBSS_PARAMS);
 972		MFIE_STRING(COUNTRY);
 973		MFIE_STRING(REQUEST);
 974		MFIE_STRING(CHALLENGE);
 975		MFIE_STRING(PWR_CONSTRAINT);
 976		MFIE_STRING(PWR_CAPABILITY);
 977		MFIE_STRING(TPC_REQUEST);
 978		MFIE_STRING(TPC_REPORT);
 979		MFIE_STRING(SUPPORTED_CHANNELS);
 980		MFIE_STRING(CHANNEL_SWITCH);
 981		MFIE_STRING(MEASURE_REQUEST);
 982		MFIE_STRING(MEASURE_REPORT);
 983		MFIE_STRING(QUIET);
 984		MFIE_STRING(IBSS_DFS);
 985		MFIE_STRING(ERP_INFO);
 986		MFIE_STRING(RSN);
 987		MFIE_STRING(EXT_SUPP_RATES);
 988		MFIE_STRING(VENDOR_SPECIFIC);
 989		MFIE_STRING(QOS_PARAMETER);
 990	default:
 991		return "UNKNOWN";
 992	}
 993}
 994#endif
 995
 996static int libipw_parse_info_param(struct libipw_info_element
 997				      *info_element, u16 length,
 998				      struct libipw_network *network)
 999{
1000	u8 i;
1001#ifdef CONFIG_LIBIPW_DEBUG
1002	char rates_str[64];
1003	char *p;
1004#endif
1005
1006	while (length >= sizeof(*info_element)) {
1007		if (sizeof(*info_element) + info_element->len > length) {
1008			LIBIPW_DEBUG_MGMT("Info elem: parse failed: "
1009					     "info_element->len + 2 > left : "
1010					     "info_element->len+2=%zd left=%d, id=%d.\n",
1011					     info_element->len +
1012					     sizeof(*info_element),
1013					     length, info_element->id);
1014			/* We stop processing but don't return an error here
1015			 * because some misbehaviour APs break this rule. ie.
1016			 * Orinoco AP1000. */
1017			break;
1018		}
1019
1020		switch (info_element->id) {
1021		case WLAN_EID_SSID:
1022			network->ssid_len = min(info_element->len,
1023						(u8) IW_ESSID_MAX_SIZE);
1024			memcpy(network->ssid, info_element->data,
1025			       network->ssid_len);
1026			if (network->ssid_len < IW_ESSID_MAX_SIZE)
1027				memset(network->ssid + network->ssid_len, 0,
1028				       IW_ESSID_MAX_SIZE - network->ssid_len);
1029
1030			LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%*pE' len=%d.\n",
1031					  network->ssid_len, network->ssid,
1032					  network->ssid_len);
1033			break;
1034
1035		case WLAN_EID_SUPP_RATES:
1036#ifdef CONFIG_LIBIPW_DEBUG
1037			p = rates_str;
1038#endif
1039			network->rates_len = min(info_element->len,
1040						 MAX_RATES_LENGTH);
1041			for (i = 0; i < network->rates_len; i++) {
1042				network->rates[i] = info_element->data[i];
1043#ifdef CONFIG_LIBIPW_DEBUG
1044				p += scnprintf(p, sizeof(rates_str) -
1045					      (p - rates_str), "%02X ",
1046					      network->rates[i]);
1047#endif
1048				if (libipw_is_ofdm_rate
1049				    (info_element->data[i])) {
1050					network->flags |= NETWORK_HAS_OFDM;
1051					if (info_element->data[i] &
1052					    LIBIPW_BASIC_RATE_MASK)
1053						network->flags &=
1054						    ~NETWORK_HAS_CCK;
1055				}
1056			}
1057
1058			LIBIPW_DEBUG_MGMT("WLAN_EID_SUPP_RATES: '%s' (%d)\n",
1059					     rates_str, network->rates_len);
1060			break;
1061
1062		case WLAN_EID_EXT_SUPP_RATES:
1063#ifdef CONFIG_LIBIPW_DEBUG
1064			p = rates_str;
1065#endif
1066			network->rates_ex_len = min(info_element->len,
1067						    MAX_RATES_EX_LENGTH);
1068			for (i = 0; i < network->rates_ex_len; i++) {
1069				network->rates_ex[i] = info_element->data[i];
1070#ifdef CONFIG_LIBIPW_DEBUG
1071				p += scnprintf(p, sizeof(rates_str) -
1072					      (p - rates_str), "%02X ",
1073					      network->rates_ex[i]);
1074#endif
1075				if (libipw_is_ofdm_rate
1076				    (info_element->data[i])) {
1077					network->flags |= NETWORK_HAS_OFDM;
1078					if (info_element->data[i] &
1079					    LIBIPW_BASIC_RATE_MASK)
1080						network->flags &=
1081						    ~NETWORK_HAS_CCK;
1082				}
1083			}
1084
1085			LIBIPW_DEBUG_MGMT("WLAN_EID_EXT_SUPP_RATES: '%s' (%d)\n",
1086					     rates_str, network->rates_ex_len);
1087			break;
1088
1089		case WLAN_EID_DS_PARAMS:
1090			LIBIPW_DEBUG_MGMT("WLAN_EID_DS_PARAMS: %d\n",
1091					     info_element->data[0]);
1092			network->channel = info_element->data[0];
1093			break;
1094
1095		case WLAN_EID_FH_PARAMS:
1096			LIBIPW_DEBUG_MGMT("WLAN_EID_FH_PARAMS: ignored\n");
1097			break;
1098
1099		case WLAN_EID_CF_PARAMS:
1100			LIBIPW_DEBUG_MGMT("WLAN_EID_CF_PARAMS: ignored\n");
1101			break;
1102
1103		case WLAN_EID_TIM:
1104			network->tim.tim_count = info_element->data[0];
1105			network->tim.tim_period = info_element->data[1];
1106			LIBIPW_DEBUG_MGMT("WLAN_EID_TIM: partially ignored\n");
1107			break;
1108
1109		case WLAN_EID_ERP_INFO:
1110			network->erp_value = info_element->data[0];
1111			network->flags |= NETWORK_HAS_ERP_VALUE;
1112			LIBIPW_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1113					     network->erp_value);
1114			break;
1115
1116		case WLAN_EID_IBSS_PARAMS:
1117			network->atim_window = info_element->data[0];
1118			LIBIPW_DEBUG_MGMT("WLAN_EID_IBSS_PARAMS: %d\n",
1119					     network->atim_window);
1120			break;
1121
1122		case WLAN_EID_CHALLENGE:
1123			LIBIPW_DEBUG_MGMT("WLAN_EID_CHALLENGE: ignored\n");
1124			break;
1125
1126		case WLAN_EID_VENDOR_SPECIFIC:
1127			LIBIPW_DEBUG_MGMT("WLAN_EID_VENDOR_SPECIFIC: %d bytes\n",
1128					     info_element->len);
1129			if (!libipw_parse_qos_info_param_IE(info_element,
1130							       network))
1131				break;
1132
1133			if (info_element->len >= 4 &&
1134			    info_element->data[0] == 0x00 &&
1135			    info_element->data[1] == 0x50 &&
1136			    info_element->data[2] == 0xf2 &&
1137			    info_element->data[3] == 0x01) {
1138				network->wpa_ie_len = min(info_element->len + 2,
1139							  MAX_WPA_IE_LEN);
1140				memcpy(network->wpa_ie, info_element,
1141				       network->wpa_ie_len);
1142			}
1143			break;
1144
1145		case WLAN_EID_RSN:
1146			LIBIPW_DEBUG_MGMT("WLAN_EID_RSN: %d bytes\n",
1147					     info_element->len);
1148			network->rsn_ie_len = min(info_element->len + 2,
1149						  MAX_WPA_IE_LEN);
1150			memcpy(network->rsn_ie, info_element,
1151			       network->rsn_ie_len);
1152			break;
1153
1154		case WLAN_EID_QOS_PARAMETER:
1155			printk(KERN_ERR
1156			       "QoS Error need to parse QOS_PARAMETER IE\n");
1157			break;
1158			/* 802.11h */
1159		case WLAN_EID_PWR_CONSTRAINT:
1160			network->power_constraint = info_element->data[0];
1161			network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1162			break;
1163
1164		case WLAN_EID_CHANNEL_SWITCH:
1165			network->power_constraint = info_element->data[0];
1166			network->flags |= NETWORK_HAS_CSA;
1167			break;
1168
1169		case WLAN_EID_QUIET:
1170			network->quiet.count = info_element->data[0];
1171			network->quiet.period = info_element->data[1];
1172			network->quiet.duration = info_element->data[2];
1173			network->quiet.offset = info_element->data[3];
1174			network->flags |= NETWORK_HAS_QUIET;
1175			break;
1176
1177		case WLAN_EID_IBSS_DFS:
1178			network->flags |= NETWORK_HAS_IBSS_DFS;
1179			break;
1180
1181		case WLAN_EID_TPC_REPORT:
1182			network->tpc_report.transmit_power =
1183			    info_element->data[0];
1184			network->tpc_report.link_margin = info_element->data[1];
1185			network->flags |= NETWORK_HAS_TPC_REPORT;
1186			break;
1187
1188		default:
1189			LIBIPW_DEBUG_MGMT
1190			    ("Unsupported info element: %s (%d)\n",
1191			     get_info_element_string(info_element->id),
1192			     info_element->id);
1193			break;
1194		}
1195
1196		length -= sizeof(*info_element) + info_element->len;
1197		info_element =
1198		    (struct libipw_info_element *)&info_element->
1199		    data[info_element->len];
1200	}
1201
1202	return 0;
1203}
1204
1205static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response
1206				       *frame, struct libipw_rx_stats *stats)
1207{
1208	struct libipw_network network_resp = { };
1209	struct libipw_network *network = &network_resp;
1210	struct net_device *dev = ieee->dev;
1211
1212	network->flags = 0;
1213	network->qos_data.active = 0;
1214	network->qos_data.supported = 0;
1215	network->qos_data.param_count = 0;
1216	network->qos_data.old_param_count = 0;
1217
1218	//network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1219	network->atim_window = le16_to_cpu(frame->aid);
1220	network->listen_interval = le16_to_cpu(frame->status);
1221	memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1222	network->capability = le16_to_cpu(frame->capability);
1223	network->last_scanned = jiffies;
1224	network->rates_len = network->rates_ex_len = 0;
1225	network->last_associate = 0;
1226	network->ssid_len = 0;
1227	network->erp_value =
1228	    (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1229
1230	if (stats->freq == LIBIPW_52GHZ_BAND) {
1231		/* for A band (No DS info) */
1232		network->channel = stats->received_channel;
1233	} else
1234		network->flags |= NETWORK_HAS_CCK;
1235
1236	network->wpa_ie_len = 0;
1237	network->rsn_ie_len = 0;
1238
1239	if (libipw_parse_info_param((void *)frame->variable,
1240				    stats->len - sizeof(*frame), network))
1241		return 1;
1242
1243	network->mode = 0;
1244	if (stats->freq == LIBIPW_52GHZ_BAND)
1245		network->mode = IEEE_A;
1246	else {
1247		if (network->flags & NETWORK_HAS_OFDM)
1248			network->mode |= IEEE_G;
1249		if (network->flags & NETWORK_HAS_CCK)
1250			network->mode |= IEEE_B;
1251	}
1252
1253	memcpy(&network->stats, stats, sizeof(network->stats));
1254
1255	if (ieee->handle_assoc_response != NULL)
1256		ieee->handle_assoc_response(dev, frame, network);
1257
1258	return 0;
1259}
1260
1261/***************************************************/
1262
1263static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_response
1264					 *beacon,
1265					 struct libipw_network *network,
1266					 struct libipw_rx_stats *stats)
1267{
1268	network->qos_data.active = 0;
1269	network->qos_data.supported = 0;
1270	network->qos_data.param_count = 0;
1271	network->qos_data.old_param_count = 0;
1272
1273	/* Pull out fixed field data */
1274	memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1275	network->capability = le16_to_cpu(beacon->capability);
1276	network->last_scanned = jiffies;
1277	network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1278	network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1279	network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1280	/* Where to pull this? beacon->listen_interval; */
1281	network->listen_interval = 0x0A;
1282	network->rates_len = network->rates_ex_len = 0;
1283	network->last_associate = 0;
1284	network->ssid_len = 0;
1285	network->flags = 0;
1286	network->atim_window = 0;
1287	network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1288	    0x3 : 0x0;
1289
1290	if (stats->freq == LIBIPW_52GHZ_BAND) {
1291		/* for A band (No DS info) */
1292		network->channel = stats->received_channel;
1293	} else
1294		network->flags |= NETWORK_HAS_CCK;
1295
1296	network->wpa_ie_len = 0;
1297	network->rsn_ie_len = 0;
1298
1299	if (libipw_parse_info_param((void *)beacon->variable,
1300				    stats->len - sizeof(*beacon), network))
1301		return 1;
1302
1303	network->mode = 0;
1304	if (stats->freq == LIBIPW_52GHZ_BAND)
1305		network->mode = IEEE_A;
1306	else {
1307		if (network->flags & NETWORK_HAS_OFDM)
1308			network->mode |= IEEE_G;
1309		if (network->flags & NETWORK_HAS_CCK)
1310			network->mode |= IEEE_B;
1311	}
1312
1313	if (network->mode == 0) {
1314		LIBIPW_DEBUG_SCAN("Filtered out '%*pE (%pM)' network.\n",
1315				  network->ssid_len, network->ssid,
1316				  network->bssid);
1317		return 1;
1318	}
1319
1320	memcpy(&network->stats, stats, sizeof(network->stats));
1321
1322	return 0;
1323}
1324
1325static inline int is_same_network(struct libipw_network *src,
1326				  struct libipw_network *dst)
1327{
1328	/* A network is only a duplicate if the channel, BSSID, and ESSID
1329	 * all match.  We treat all <hidden> with the same BSSID and channel
1330	 * as one network */
1331	return ((src->ssid_len == dst->ssid_len) &&
1332		(src->channel == dst->channel) &&
1333		ether_addr_equal_64bits(src->bssid, dst->bssid) &&
1334		!memcmp(src->ssid, dst->ssid, src->ssid_len));
1335}
1336
1337static void update_network(struct libipw_network *dst,
1338				  struct libipw_network *src)
1339{
1340	int qos_active;
1341	u8 old_param;
1342
1343	/* We only update the statistics if they were created by receiving
1344	 * the network information on the actual channel the network is on.
1345	 *
1346	 * This keeps beacons received on neighbor channels from bringing
1347	 * down the signal level of an AP. */
1348	if (dst->channel == src->stats.received_channel)
1349		memcpy(&dst->stats, &src->stats,
1350		       sizeof(struct libipw_rx_stats));
1351	else
1352		LIBIPW_DEBUG_SCAN("Network %pM info received "
1353			"off channel (%d vs. %d)\n", src->bssid,
1354			dst->channel, src->stats.received_channel);
1355
1356	dst->capability = src->capability;
1357	memcpy(dst->rates, src->rates, src->rates_len);
1358	dst->rates_len = src->rates_len;
1359	memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1360	dst->rates_ex_len = src->rates_ex_len;
1361
1362	dst->mode = src->mode;
1363	dst->flags = src->flags;
1364	dst->time_stamp[0] = src->time_stamp[0];
1365	dst->time_stamp[1] = src->time_stamp[1];
1366
1367	dst->beacon_interval = src->beacon_interval;
1368	dst->listen_interval = src->listen_interval;
1369	dst->atim_window = src->atim_window;
1370	dst->erp_value = src->erp_value;
1371	dst->tim = src->tim;
1372
1373	memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1374	dst->wpa_ie_len = src->wpa_ie_len;
1375	memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1376	dst->rsn_ie_len = src->rsn_ie_len;
1377
1378	dst->last_scanned = jiffies;
1379	qos_active = src->qos_data.active;
1380	old_param = dst->qos_data.old_param_count;
1381	if (dst->flags & NETWORK_HAS_QOS_MASK)
1382		memcpy(&dst->qos_data, &src->qos_data,
1383		       sizeof(struct libipw_qos_data));
1384	else {
1385		dst->qos_data.supported = src->qos_data.supported;
1386		dst->qos_data.param_count = src->qos_data.param_count;
1387	}
1388
1389	if (dst->qos_data.supported == 1) {
1390		if (dst->ssid_len)
1391			LIBIPW_DEBUG_QOS
1392			    ("QoS the network %s is QoS supported\n",
1393			     dst->ssid);
1394		else
1395			LIBIPW_DEBUG_QOS
1396			    ("QoS the network is QoS supported\n");
1397	}
1398	dst->qos_data.active = qos_active;
1399	dst->qos_data.old_param_count = old_param;
1400
1401	/* dst->last_associate is not overwritten */
1402}
1403
1404static inline int is_beacon(__le16 fc)
1405{
1406	return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1407}
1408
1409static void libipw_process_probe_response(struct libipw_device
1410						    *ieee, struct
1411						    libipw_probe_response
1412						    *beacon, struct libipw_rx_stats
1413						    *stats)
1414{
1415	struct net_device *dev = ieee->dev;
1416	struct libipw_network network = { };
1417	struct libipw_network *target;
1418	struct libipw_network *oldest = NULL;
1419#ifdef CONFIG_LIBIPW_DEBUG
1420	struct libipw_info_element *info_element = (void *)beacon->variable;
1421#endif
1422	unsigned long flags;
1423
1424	LIBIPW_DEBUG_SCAN("'%*pE' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1425		     info_element->len, info_element->data,
1426		     beacon->header.addr3,
1427		     (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0',
1428		     (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0',
1429		     (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0',
1430		     (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0',
1431		     (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0',
1432		     (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0',
1433		     (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0',
1434		     (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0',
1435		     (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0',
1436		     (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0',
1437		     (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0',
1438		     (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0',
1439		     (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0',
1440		     (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0',
1441		     (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0',
1442		     (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0');
1443
1444	if (libipw_network_init(ieee, beacon, &network, stats)) {
1445		LIBIPW_DEBUG_SCAN("Dropped '%*pE' (%pM) via %s.\n",
1446				  info_element->len, info_element->data,
1447				  beacon->header.addr3,
1448				  is_beacon(beacon->header.frame_ctl) ?
1449				  "BEACON" : "PROBE RESPONSE");
1450		return;
1451	}
1452
1453	/* The network parsed correctly -- so now we scan our known networks
1454	 * to see if we can find it in our list.
1455	 *
1456	 * NOTE:  This search is definitely not optimized.  Once its doing
1457	 *        the "right thing" we'll optimize it for efficiency if
1458	 *        necessary */
1459
1460	/* Search for this entry in the list and update it if it is
1461	 * already there. */
1462
1463	spin_lock_irqsave(&ieee->lock, flags);
1464
1465	list_for_each_entry(target, &ieee->network_list, list) {
1466		if (is_same_network(target, &network))
1467			break;
1468
1469		if ((oldest == NULL) ||
1470		    time_before(target->last_scanned, oldest->last_scanned))
1471			oldest = target;
1472	}
1473
1474	/* If we didn't find a match, then get a new network slot to initialize
1475	 * with this beacon's information */
1476	if (&target->list == &ieee->network_list) {
1477		if (list_empty(&ieee->network_free_list)) {
1478			/* If there are no more slots, expire the oldest */
1479			list_del(&oldest->list);
1480			target = oldest;
1481			LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n",
1482					  target->ssid_len, target->ssid,
1483					  target->bssid);
1484		} else {
1485			/* Otherwise just pull from the free list */
1486			target = list_entry(ieee->network_free_list.next,
1487					    struct libipw_network, list);
1488			list_del(ieee->network_free_list.next);
1489		}
1490
1491#ifdef CONFIG_LIBIPW_DEBUG
1492		LIBIPW_DEBUG_SCAN("Adding '%*pE' (%pM) via %s.\n",
1493				  network.ssid_len, network.ssid,
1494				  network.bssid,
1495				  is_beacon(beacon->header.frame_ctl) ?
1496				  "BEACON" : "PROBE RESPONSE");
1497#endif
1498		memcpy(target, &network, sizeof(*target));
1499		list_add_tail(&target->list, &ieee->network_list);
1500	} else {
1501		LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n",
1502				  target->ssid_len, target->ssid,
1503				  target->bssid,
1504				  is_beacon(beacon->header.frame_ctl) ?
1505				  "BEACON" : "PROBE RESPONSE");
1506		update_network(target, &network);
1507	}
1508
1509	spin_unlock_irqrestore(&ieee->lock, flags);
1510
1511	if (is_beacon(beacon->header.frame_ctl)) {
1512		if (ieee->handle_beacon != NULL)
1513			ieee->handle_beacon(dev, beacon, target);
1514	} else {
1515		if (ieee->handle_probe_response != NULL)
1516			ieee->handle_probe_response(dev, beacon, target);
1517	}
1518}
1519
1520void libipw_rx_mgt(struct libipw_device *ieee,
1521		      struct libipw_hdr_4addr *header,
1522		      struct libipw_rx_stats *stats)
1523{
1524	switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1525	case IEEE80211_STYPE_ASSOC_RESP:
1526		LIBIPW_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1527				     WLAN_FC_GET_STYPE(le16_to_cpu
1528						       (header->frame_ctl)));
1529		libipw_handle_assoc_resp(ieee,
1530					    (struct libipw_assoc_response *)
1531					    header, stats);
1532		break;
1533
1534	case IEEE80211_STYPE_REASSOC_RESP:
1535		LIBIPW_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1536				     WLAN_FC_GET_STYPE(le16_to_cpu
1537						       (header->frame_ctl)));
1538		break;
1539
1540	case IEEE80211_STYPE_PROBE_REQ:
1541		LIBIPW_DEBUG_MGMT("received auth (%d)\n",
1542				     WLAN_FC_GET_STYPE(le16_to_cpu
1543						       (header->frame_ctl)));
1544
1545		if (ieee->handle_probe_request != NULL)
1546			ieee->handle_probe_request(ieee->dev,
1547						   (struct
1548						    libipw_probe_request *)
1549						   header, stats);
1550		break;
1551
1552	case IEEE80211_STYPE_PROBE_RESP:
1553		LIBIPW_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1554				     WLAN_FC_GET_STYPE(le16_to_cpu
1555						       (header->frame_ctl)));
1556		LIBIPW_DEBUG_SCAN("Probe response\n");
1557		libipw_process_probe_response(ieee,
1558						 (struct
1559						  libipw_probe_response *)
1560						 header, stats);
1561		break;
1562
1563	case IEEE80211_STYPE_BEACON:
1564		LIBIPW_DEBUG_MGMT("received BEACON (%d)\n",
1565				     WLAN_FC_GET_STYPE(le16_to_cpu
1566						       (header->frame_ctl)));
1567		LIBIPW_DEBUG_SCAN("Beacon\n");
1568		libipw_process_probe_response(ieee,
1569						 (struct
1570						  libipw_probe_response *)
1571						 header, stats);
1572		break;
1573	case IEEE80211_STYPE_AUTH:
1574
1575		LIBIPW_DEBUG_MGMT("received auth (%d)\n",
1576				     WLAN_FC_GET_STYPE(le16_to_cpu
1577						       (header->frame_ctl)));
1578
1579		if (ieee->handle_auth != NULL)
1580			ieee->handle_auth(ieee->dev,
1581					  (struct libipw_auth *)header);
1582		break;
1583
1584	case IEEE80211_STYPE_DISASSOC:
1585		if (ieee->handle_disassoc != NULL)
1586			ieee->handle_disassoc(ieee->dev,
1587					      (struct libipw_disassoc *)
1588					      header);
1589		break;
1590
1591	case IEEE80211_STYPE_ACTION:
1592		LIBIPW_DEBUG_MGMT("ACTION\n");
1593		if (ieee->handle_action)
1594			ieee->handle_action(ieee->dev,
1595					    (struct libipw_action *)
1596					    header, stats);
1597		break;
1598
1599	case IEEE80211_STYPE_REASSOC_REQ:
1600		LIBIPW_DEBUG_MGMT("received reassoc (%d)\n",
1601				     WLAN_FC_GET_STYPE(le16_to_cpu
1602						       (header->frame_ctl)));
1603
1604		LIBIPW_DEBUG_MGMT("%s: LIBIPW_REASSOC_REQ received\n",
1605				     ieee->dev->name);
1606		if (ieee->handle_reassoc_request != NULL)
1607			ieee->handle_reassoc_request(ieee->dev,
1608						    (struct libipw_reassoc_request *)
1609						     header);
1610		break;
1611
1612	case IEEE80211_STYPE_ASSOC_REQ:
1613		LIBIPW_DEBUG_MGMT("received assoc (%d)\n",
1614				     WLAN_FC_GET_STYPE(le16_to_cpu
1615						       (header->frame_ctl)));
1616
1617		LIBIPW_DEBUG_MGMT("%s: LIBIPW_ASSOC_REQ received\n",
1618				     ieee->dev->name);
1619		if (ieee->handle_assoc_request != NULL)
1620			ieee->handle_assoc_request(ieee->dev);
1621		break;
1622
1623	case IEEE80211_STYPE_DEAUTH:
1624		LIBIPW_DEBUG_MGMT("DEAUTH\n");
1625		if (ieee->handle_deauth != NULL)
1626			ieee->handle_deauth(ieee->dev,
1627					    (struct libipw_deauth *)
1628					    header);
1629		break;
1630	default:
1631		LIBIPW_DEBUG_MGMT("received UNKNOWN (%d)\n",
1632				     WLAN_FC_GET_STYPE(le16_to_cpu
1633						       (header->frame_ctl)));
1634		LIBIPW_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1635				     ieee->dev->name,
1636				     WLAN_FC_GET_STYPE(le16_to_cpu
1637						       (header->frame_ctl)));
1638		break;
1639	}
1640}
1641
1642EXPORT_SYMBOL(libipw_rx_mgt);
1643EXPORT_SYMBOL(libipw_rx);