[PATCH] remove gcc-2 checks
[linux-2.6.git] / net / ieee80211 / ieee80211_rx.c
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) 2004-2005, 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 #include <linux/compiler.h>
17 #include <linux/config.h>
18 #include <linux/errno.h>
19 #include <linux/if_arp.h>
20 #include <linux/in6.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
26 #include <linux/proc_fs.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <linux/tcp.h>
30 #include <linux/types.h>
31 #include <linux/wireless.h>
32 #include <linux/etherdevice.h>
33 #include <asm/uaccess.h>
34 #include <linux/ctype.h>
35
36 #include <net/ieee80211.h>
37
38 static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee,
39                                         struct sk_buff *skb,
40                                         struct ieee80211_rx_stats *rx_stats)
41 {
42         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
43         u16 fc = le16_to_cpu(hdr->frame_ctl);
44
45         skb->dev = ieee->dev;
46         skb->mac.raw = skb->data;
47         skb_pull(skb, ieee80211_get_hdrlen(fc));
48         skb->pkt_type = PACKET_OTHERHOST;
49         skb->protocol = __constant_htons(ETH_P_80211_RAW);
50         memset(skb->cb, 0, sizeof(skb->cb));
51         netif_rx(skb);
52 }
53
54 /* Called only as a tasklet (software IRQ) */
55 static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
56                                                               ieee80211_device
57                                                               *ieee,
58                                                               unsigned int seq,
59                                                               unsigned int frag,
60                                                               u8 * src,
61                                                               u8 * dst)
62 {
63         struct ieee80211_frag_entry *entry;
64         int i;
65
66         for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
67                 entry = &ieee->frag_cache[i];
68                 if (entry->skb != NULL &&
69                     time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
70                         IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
71                                              "seq=%u last_frag=%u\n",
72                                              entry->seq, entry->last_frag);
73                         dev_kfree_skb_any(entry->skb);
74                         entry->skb = NULL;
75                 }
76
77                 if (entry->skb != NULL && entry->seq == seq &&
78                     (entry->last_frag + 1 == frag || frag == -1) &&
79                     memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
80                     memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
81                         return entry;
82         }
83
84         return NULL;
85 }
86
87 /* Called only as a tasklet (software IRQ) */
88 static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
89                                                 struct ieee80211_hdr_4addr *hdr)
90 {
91         struct sk_buff *skb = NULL;
92         u16 sc;
93         unsigned int frag, seq;
94         struct ieee80211_frag_entry *entry;
95
96         sc = le16_to_cpu(hdr->seq_ctl);
97         frag = WLAN_GET_SEQ_FRAG(sc);
98         seq = WLAN_GET_SEQ_SEQ(sc);
99
100         if (frag == 0) {
101                 /* Reserve enough space to fit maximum frame length */
102                 skb = dev_alloc_skb(ieee->dev->mtu +
103                                     sizeof(struct ieee80211_hdr_4addr) +
104                                     8 /* LLC */  +
105                                     2 /* alignment */  +
106                                     8 /* WEP */  + ETH_ALEN /* WDS */ );
107                 if (skb == NULL)
108                         return NULL;
109
110                 entry = &ieee->frag_cache[ieee->frag_next_idx];
111                 ieee->frag_next_idx++;
112                 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
113                         ieee->frag_next_idx = 0;
114
115                 if (entry->skb != NULL)
116                         dev_kfree_skb_any(entry->skb);
117
118                 entry->first_frag_time = jiffies;
119                 entry->seq = seq;
120                 entry->last_frag = frag;
121                 entry->skb = skb;
122                 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
123                 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
124         } else {
125                 /* received a fragment of a frame for which the head fragment
126                  * should have already been received */
127                 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
128                                                   hdr->addr1);
129                 if (entry != NULL) {
130                         entry->last_frag = frag;
131                         skb = entry->skb;
132                 }
133         }
134
135         return skb;
136 }
137
138 /* Called only as a tasklet (software IRQ) */
139 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
140                                            struct ieee80211_hdr_4addr *hdr)
141 {
142         u16 sc;
143         unsigned int seq;
144         struct ieee80211_frag_entry *entry;
145
146         sc = le16_to_cpu(hdr->seq_ctl);
147         seq = WLAN_GET_SEQ_SEQ(sc);
148
149         entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
150                                           hdr->addr1);
151
152         if (entry == NULL) {
153                 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
154                                      "entry (seq=%u)\n", seq);
155                 return -1;
156         }
157
158         entry->skb = NULL;
159         return 0;
160 }
161
162 #ifdef NOT_YET
163 /* ieee80211_rx_frame_mgtmt
164  *
165  * Responsible for handling management control frames
166  *
167  * Called by ieee80211_rx */
168 static inline int
169 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
170                         struct ieee80211_rx_stats *rx_stats, u16 type,
171                         u16 stype)
172 {
173         if (ieee->iw_mode == IW_MODE_MASTER) {
174                 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
175                        ieee->dev->name);
176                 return 0;
177 /*
178   hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
179   skb->data);*/
180         }
181
182         if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
183                 if (stype == WLAN_FC_STYPE_BEACON &&
184                     ieee->iw_mode == IW_MODE_MASTER) {
185                         struct sk_buff *skb2;
186                         /* Process beacon frames also in kernel driver to
187                          * update STA(AP) table statistics */
188                         skb2 = skb_clone(skb, GFP_ATOMIC);
189                         if (skb2)
190                                 hostap_rx(skb2->dev, skb2, rx_stats);
191                 }
192
193                 /* send management frames to the user space daemon for
194                  * processing */
195                 ieee->apdevstats.rx_packets++;
196                 ieee->apdevstats.rx_bytes += skb->len;
197                 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
198                 return 0;
199         }
200
201         if (ieee->iw_mode == IW_MODE_MASTER) {
202                 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
203                         printk(KERN_DEBUG "%s: unknown management frame "
204                                "(type=0x%02x, stype=0x%02x) dropped\n",
205                                skb->dev->name, type, stype);
206                         return -1;
207                 }
208
209                 hostap_rx(skb->dev, skb, rx_stats);
210                 return 0;
211         }
212
213         printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
214                "received in non-Host AP mode\n", skb->dev->name);
215         return -1;
216 }
217 #endif
218
219 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
220 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
221 static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
222
223 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
224 static unsigned char bridge_tunnel_header[] =
225     { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
226 /* No encapsulation header if EtherType < 0x600 (=length) */
227
228 /* Called by ieee80211_rx_frame_decrypt */
229 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
230                                     struct sk_buff *skb)
231 {
232         struct net_device *dev = ieee->dev;
233         u16 fc, ethertype;
234         struct ieee80211_hdr_3addr *hdr;
235         u8 *pos;
236
237         if (skb->len < 24)
238                 return 0;
239
240         hdr = (struct ieee80211_hdr_3addr *)skb->data;
241         fc = le16_to_cpu(hdr->frame_ctl);
242
243         /* check that the frame is unicast frame to us */
244         if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
245             IEEE80211_FCTL_TODS &&
246             memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
247             memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
248                 /* ToDS frame with own addr BSSID and DA */
249         } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
250                    IEEE80211_FCTL_FROMDS &&
251                    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
252                 /* FromDS frame with own addr as DA */
253         } else
254                 return 0;
255
256         if (skb->len < 24 + 8)
257                 return 0;
258
259         /* check for port access entity Ethernet type */
260         pos = skb->data + 24;
261         ethertype = (pos[6] << 8) | pos[7];
262         if (ethertype == ETH_P_PAE)
263                 return 1;
264
265         return 0;
266 }
267
268 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
269 static inline int
270 ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
271                            struct ieee80211_crypt_data *crypt)
272 {
273         struct ieee80211_hdr_3addr *hdr;
274         int res, hdrlen;
275
276         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
277                 return 0;
278
279         hdr = (struct ieee80211_hdr_3addr *)skb->data;
280         hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
281
282         atomic_inc(&crypt->refcnt);
283         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
284         atomic_dec(&crypt->refcnt);
285         if (res < 0) {
286                 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
287                                      ") res=%d\n", MAC_ARG(hdr->addr2), res);
288                 if (res == -2)
289                         IEEE80211_DEBUG_DROP("Decryption failed ICV "
290                                              "mismatch (key %d)\n",
291                                              skb->data[hdrlen + 3] >> 6);
292                 ieee->ieee_stats.rx_discards_undecryptable++;
293                 return -1;
294         }
295
296         return res;
297 }
298
299 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
300 static inline int
301 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
302                                 struct sk_buff *skb, int keyidx,
303                                 struct ieee80211_crypt_data *crypt)
304 {
305         struct ieee80211_hdr_3addr *hdr;
306         int res, hdrlen;
307
308         if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
309                 return 0;
310
311         hdr = (struct ieee80211_hdr_3addr *)skb->data;
312         hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
313
314         atomic_inc(&crypt->refcnt);
315         res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
316         atomic_dec(&crypt->refcnt);
317         if (res < 0) {
318                 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
319                        " (SA=" MAC_FMT " keyidx=%d)\n",
320                        ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
321                 return -1;
322         }
323
324         return 0;
325 }
326
327 /* All received frames are sent to this function. @skb contains the frame in
328  * IEEE 802.11 format, i.e., in the format it was sent over air.
329  * This function is called only as a tasklet (software IRQ). */
330 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
331                  struct ieee80211_rx_stats *rx_stats)
332 {
333         struct net_device *dev = ieee->dev;
334         struct ieee80211_hdr_4addr *hdr;
335         size_t hdrlen;
336         u16 fc, type, stype, sc;
337         struct net_device_stats *stats;
338         unsigned int frag;
339         u8 *payload;
340         u16 ethertype;
341 #ifdef NOT_YET
342         struct net_device *wds = NULL;
343         struct sk_buff *skb2 = NULL;
344         struct net_device *wds = NULL;
345         int frame_authorized = 0;
346         int from_assoc_ap = 0;
347         void *sta = NULL;
348 #endif
349         u8 dst[ETH_ALEN];
350         u8 src[ETH_ALEN];
351         struct ieee80211_crypt_data *crypt = NULL;
352         int keyidx = 0;
353
354         hdr = (struct ieee80211_hdr_4addr *)skb->data;
355         stats = &ieee->stats;
356
357         if (skb->len < 10) {
358                 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
359                 goto rx_dropped;
360         }
361
362         fc = le16_to_cpu(hdr->frame_ctl);
363         type = WLAN_FC_GET_TYPE(fc);
364         stype = WLAN_FC_GET_STYPE(fc);
365         sc = le16_to_cpu(hdr->seq_ctl);
366         frag = WLAN_GET_SEQ_FRAG(sc);
367         hdrlen = ieee80211_get_hdrlen(fc);
368
369         /* Put this code here so that we avoid duplicating it in all
370          * Rx paths. - Jean II */
371 #ifdef IW_WIRELESS_SPY          /* defined in iw_handler.h */
372 #ifdef CONFIG_NET_RADIO
373         /* If spy monitoring on */
374         if (ieee->spy_data.spy_number > 0) {
375                 struct iw_quality wstats;
376
377                 wstats.updated = 0;
378                 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
379                         wstats.level = rx_stats->rssi;
380                         wstats.updated |= IW_QUAL_LEVEL_UPDATED;
381                 } else
382                         wstats.updated |= IW_QUAL_LEVEL_INVALID;
383
384                 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
385                         wstats.noise = rx_stats->noise;
386                         wstats.updated |= IW_QUAL_NOISE_UPDATED;
387                 } else
388                         wstats.updated |= IW_QUAL_NOISE_INVALID;
389
390                 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
391                         wstats.qual = rx_stats->signal;
392                         wstats.updated |= IW_QUAL_QUAL_UPDATED;
393                 } else
394                         wstats.updated |= IW_QUAL_QUAL_INVALID;
395
396                 /* Update spy records */
397                 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
398         }
399 #endif                          /* CONFIG_NET_RADIO */
400 #endif                          /* IW_WIRELESS_SPY */
401
402 #ifdef NOT_YET
403         hostap_update_rx_stats(local->ap, hdr, rx_stats);
404 #endif
405
406         if (ieee->iw_mode == IW_MODE_MONITOR) {
407                 ieee80211_monitor_rx(ieee, skb, rx_stats);
408                 stats->rx_packets++;
409                 stats->rx_bytes += skb->len;
410                 return 1;
411         }
412
413         if (is_multicast_ether_addr(hdr->addr1)
414             ? ieee->host_mc_decrypt : ieee->host_decrypt) {
415                 int idx = 0;
416                 if (skb->len >= hdrlen + 3)
417                         idx = skb->data[hdrlen + 3] >> 6;
418                 crypt = ieee->crypt[idx];
419 #ifdef NOT_YET
420                 sta = NULL;
421
422                 /* Use station specific key to override default keys if the
423                  * receiver address is a unicast address ("individual RA"). If
424                  * bcrx_sta_key parameter is set, station specific key is used
425                  * even with broad/multicast targets (this is against IEEE
426                  * 802.11, but makes it easier to use different keys with
427                  * stations that do not support WEP key mapping). */
428
429                 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
430                         (void)hostap_handle_sta_crypto(local, hdr, &crypt,
431                                                        &sta);
432 #endif
433
434                 /* allow NULL decrypt to indicate an station specific override
435                  * for default encryption */
436                 if (crypt && (crypt->ops == NULL ||
437                               crypt->ops->decrypt_mpdu == NULL))
438                         crypt = NULL;
439
440                 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
441                         /* This seems to be triggered by some (multicast?)
442                          * frames from other than current BSS, so just drop the
443                          * frames silently instead of filling system log with
444                          * these reports. */
445                         IEEE80211_DEBUG_DROP("Decryption failed (not set)"
446                                              " (SA=" MAC_FMT ")\n",
447                                              MAC_ARG(hdr->addr2));
448                         ieee->ieee_stats.rx_discards_undecryptable++;
449                         goto rx_dropped;
450                 }
451         }
452 #ifdef NOT_YET
453         if (type != WLAN_FC_TYPE_DATA) {
454                 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
455                     fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
456                     (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
457                         printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
458                                "from " MAC_FMT "\n", dev->name,
459                                MAC_ARG(hdr->addr2));
460                         /* TODO: could inform hostapd about this so that it
461                          * could send auth failure report */
462                         goto rx_dropped;
463                 }
464
465                 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
466                         goto rx_dropped;
467                 else
468                         goto rx_exit;
469         }
470 #endif
471
472         /* Data frame - extract src/dst addresses */
473         if (skb->len < IEEE80211_3ADDR_LEN)
474                 goto rx_dropped;
475
476         switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
477         case IEEE80211_FCTL_FROMDS:
478                 memcpy(dst, hdr->addr1, ETH_ALEN);
479                 memcpy(src, hdr->addr3, ETH_ALEN);
480                 break;
481         case IEEE80211_FCTL_TODS:
482                 memcpy(dst, hdr->addr3, ETH_ALEN);
483                 memcpy(src, hdr->addr2, ETH_ALEN);
484                 break;
485         case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
486                 if (skb->len < IEEE80211_4ADDR_LEN)
487                         goto rx_dropped;
488                 memcpy(dst, hdr->addr3, ETH_ALEN);
489                 memcpy(src, hdr->addr4, ETH_ALEN);
490                 break;
491         case 0:
492                 memcpy(dst, hdr->addr1, ETH_ALEN);
493                 memcpy(src, hdr->addr2, ETH_ALEN);
494                 break;
495         }
496
497 #ifdef NOT_YET
498         if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
499                 goto rx_dropped;
500         if (wds) {
501                 skb->dev = dev = wds;
502                 stats = hostap_get_stats(dev);
503         }
504
505         if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
506             (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
507             IEEE80211_FCTL_FROMDS && ieee->stadev
508             && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
509                 /* Frame from BSSID of the AP for which we are a client */
510                 skb->dev = dev = ieee->stadev;
511                 stats = hostap_get_stats(dev);
512                 from_assoc_ap = 1;
513         }
514 #endif
515
516         dev->last_rx = jiffies;
517
518 #ifdef NOT_YET
519         if ((ieee->iw_mode == IW_MODE_MASTER ||
520              ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
521                 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
522                                              wds != NULL)) {
523                 case AP_RX_CONTINUE_NOT_AUTHORIZED:
524                         frame_authorized = 0;
525                         break;
526                 case AP_RX_CONTINUE:
527                         frame_authorized = 1;
528                         break;
529                 case AP_RX_DROP:
530                         goto rx_dropped;
531                 case AP_RX_EXIT:
532                         goto rx_exit;
533                 }
534         }
535 #endif
536
537         /* Nullfunc frames may have PS-bit set, so they must be passed to
538          * hostap_handle_sta_rx() before being dropped here. */
539
540         stype &= ~IEEE80211_STYPE_QOS_DATA;
541
542         if (stype != IEEE80211_STYPE_DATA &&
543             stype != IEEE80211_STYPE_DATA_CFACK &&
544             stype != IEEE80211_STYPE_DATA_CFPOLL &&
545             stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
546                 if (stype != IEEE80211_STYPE_NULLFUNC)
547                         IEEE80211_DEBUG_DROP("RX: dropped data frame "
548                                              "with no data (type=0x%02x, "
549                                              "subtype=0x%02x, len=%d)\n",
550                                              type, stype, skb->len);
551                 goto rx_dropped;
552         }
553
554         /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
555
556         if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
557             (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
558                 goto rx_dropped;
559
560         hdr = (struct ieee80211_hdr_4addr *)skb->data;
561
562         /* skb: hdr + (possibly fragmented) plaintext payload */
563         // PR: FIXME: hostap has additional conditions in the "if" below:
564         // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
565         if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
566                 int flen;
567                 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
568                 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
569
570                 if (!frag_skb) {
571                         IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
572                                         "Rx cannot get skb from fragment "
573                                         "cache (morefrag=%d seq=%u frag=%u)\n",
574                                         (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
575                                         WLAN_GET_SEQ_SEQ(sc), frag);
576                         goto rx_dropped;
577                 }
578
579                 flen = skb->len;
580                 if (frag != 0)
581                         flen -= hdrlen;
582
583                 if (frag_skb->tail + flen > frag_skb->end) {
584                         printk(KERN_WARNING "%s: host decrypted and "
585                                "reassembled frame did not fit skb\n",
586                                dev->name);
587                         ieee80211_frag_cache_invalidate(ieee, hdr);
588                         goto rx_dropped;
589                 }
590
591                 if (frag == 0) {
592                         /* copy first fragment (including full headers) into
593                          * beginning of the fragment cache skb */
594                         memcpy(skb_put(frag_skb, flen), skb->data, flen);
595                 } else {
596                         /* append frame payload to the end of the fragment
597                          * cache skb */
598                         memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
599                                flen);
600                 }
601                 dev_kfree_skb_any(skb);
602                 skb = NULL;
603
604                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
605                         /* more fragments expected - leave the skb in fragment
606                          * cache for now; it will be delivered to upper layers
607                          * after all fragments have been received */
608                         goto rx_exit;
609                 }
610
611                 /* this was the last fragment and the frame will be
612                  * delivered, so remove skb from fragment cache */
613                 skb = frag_skb;
614                 hdr = (struct ieee80211_hdr_4addr *)skb->data;
615                 ieee80211_frag_cache_invalidate(ieee, hdr);
616         }
617
618         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
619          * encrypted/authenticated */
620         if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
621             ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
622                 goto rx_dropped;
623
624         hdr = (struct ieee80211_hdr_4addr *)skb->data;
625         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
626                 if (            /*ieee->ieee802_1x && */
627                            ieee80211_is_eapol_frame(ieee, skb)) {
628                         /* pass unencrypted EAPOL frames even if encryption is
629                          * configured */
630                 } else {
631                         IEEE80211_DEBUG_DROP("encryption configured, but RX "
632                                              "frame not encrypted (SA=" MAC_FMT
633                                              ")\n", MAC_ARG(hdr->addr2));
634                         goto rx_dropped;
635                 }
636         }
637
638         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
639             !ieee80211_is_eapol_frame(ieee, skb)) {
640                 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
641                                      "frame from " MAC_FMT
642                                      " (drop_unencrypted=1)\n",
643                                      MAC_ARG(hdr->addr2));
644                 goto rx_dropped;
645         }
646
647         /* skb: hdr + (possible reassembled) full plaintext payload */
648
649         payload = skb->data + hdrlen;
650         ethertype = (payload[6] << 8) | payload[7];
651
652 #ifdef NOT_YET
653         /* If IEEE 802.1X is used, check whether the port is authorized to send
654          * the received frame. */
655         if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
656                 if (ethertype == ETH_P_PAE) {
657                         printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
658                                dev->name);
659                         if (ieee->hostapd && ieee->apdev) {
660                                 /* Send IEEE 802.1X frames to the user
661                                  * space daemon for processing */
662                                 prism2_rx_80211(ieee->apdev, skb, rx_stats,
663                                                 PRISM2_RX_MGMT);
664                                 ieee->apdevstats.rx_packets++;
665                                 ieee->apdevstats.rx_bytes += skb->len;
666                                 goto rx_exit;
667                         }
668                 } else if (!frame_authorized) {
669                         printk(KERN_DEBUG "%s: dropped frame from "
670                                "unauthorized port (IEEE 802.1X): "
671                                "ethertype=0x%04x\n", dev->name, ethertype);
672                         goto rx_dropped;
673                 }
674         }
675 #endif
676
677         /* convert hdr + possible LLC headers into Ethernet header */
678         if (skb->len - hdrlen >= 8 &&
679             ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
680               ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
681              memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
682                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
683                  * replace EtherType */
684                 skb_pull(skb, hdrlen + SNAP_SIZE);
685                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
686                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
687         } else {
688                 u16 len;
689                 /* Leave Ethernet header part of hdr and full payload */
690                 skb_pull(skb, hdrlen);
691                 len = htons(skb->len);
692                 memcpy(skb_push(skb, 2), &len, 2);
693                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
694                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
695         }
696
697 #ifdef NOT_YET
698         if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
699                     IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
700                 /* Non-standard frame: get addr4 from its bogus location after
701                  * the payload */
702                 memcpy(skb->data + ETH_ALEN,
703                        skb->data + skb->len - ETH_ALEN, ETH_ALEN);
704                 skb_trim(skb, skb->len - ETH_ALEN);
705         }
706 #endif
707
708         stats->rx_packets++;
709         stats->rx_bytes += skb->len;
710
711 #ifdef NOT_YET
712         if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
713                 if (dst[0] & 0x01) {
714                         /* copy multicast frame both to the higher layers and
715                          * to the wireless media */
716                         ieee->ap->bridged_multicast++;
717                         skb2 = skb_clone(skb, GFP_ATOMIC);
718                         if (skb2 == NULL)
719                                 printk(KERN_DEBUG "%s: skb_clone failed for "
720                                        "multicast frame\n", dev->name);
721                 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
722                         /* send frame directly to the associated STA using
723                          * wireless media and not passing to higher layers */
724                         ieee->ap->bridged_unicast++;
725                         skb2 = skb;
726                         skb = NULL;
727                 }
728         }
729
730         if (skb2 != NULL) {
731                 /* send to wireless media */
732                 skb2->protocol = __constant_htons(ETH_P_802_3);
733                 skb2->mac.raw = skb2->nh.raw = skb2->data;
734                 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
735                 skb2->dev = dev;
736                 dev_queue_xmit(skb2);
737         }
738 #endif
739
740         if (skb) {
741                 skb->protocol = eth_type_trans(skb, dev);
742                 memset(skb->cb, 0, sizeof(skb->cb));
743                 skb->dev = dev;
744                 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
745                 netif_rx(skb);
746         }
747
748       rx_exit:
749 #ifdef NOT_YET
750         if (sta)
751                 hostap_handle_sta_release(sta);
752 #endif
753         return 1;
754
755       rx_dropped:
756         stats->rx_dropped++;
757
758         /* Returning 0 indicates to caller that we have not handled the SKB--
759          * so it is still allocated and can be used again by underlying
760          * hardware as a DMA target */
761         return 0;
762 }
763
764 #define MGMT_FRAME_FIXED_PART_LENGTH            0x24
765
766 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
767
768 /*
769 * Make ther structure we read from the beacon packet has
770 * the right values
771 */
772 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
773                                      *info_element, int sub_type)
774 {
775
776         if (info_element->qui_subtype != sub_type)
777                 return -1;
778         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
779                 return -1;
780         if (info_element->qui_type != QOS_OUI_TYPE)
781                 return -1;
782         if (info_element->version != QOS_VERSION_1)
783                 return -1;
784
785         return 0;
786 }
787
788 /*
789  * Parse a QoS parameter element
790  */
791 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
792                                             *element_param, struct ieee80211_info_element
793                                             *info_element)
794 {
795         int ret = 0;
796         u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
797
798         if ((info_element == NULL) || (element_param == NULL))
799                 return -1;
800
801         if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
802                 memcpy(element_param->info_element.qui, info_element->data,
803                        info_element->len);
804                 element_param->info_element.elementID = info_element->id;
805                 element_param->info_element.length = info_element->len;
806         } else
807                 ret = -1;
808         if (ret == 0)
809                 ret = ieee80211_verify_qos_info(&element_param->info_element,
810                                                 QOS_OUI_PARAM_SUB_TYPE);
811         return ret;
812 }
813
814 /*
815  * Parse a QoS information element
816  */
817 static int ieee80211_read_qos_info_element(struct
818                                            ieee80211_qos_information_element
819                                            *element_info, struct ieee80211_info_element
820                                            *info_element)
821 {
822         int ret = 0;
823         u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
824
825         if (element_info == NULL)
826                 return -1;
827         if (info_element == NULL)
828                 return -1;
829
830         if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
831                 memcpy(element_info->qui, info_element->data,
832                        info_element->len);
833                 element_info->elementID = info_element->id;
834                 element_info->length = info_element->len;
835         } else
836                 ret = -1;
837
838         if (ret == 0)
839                 ret = ieee80211_verify_qos_info(element_info,
840                                                 QOS_OUI_INFO_SUB_TYPE);
841         return ret;
842 }
843
844 /*
845  * Write QoS parameters from the ac parameters.
846  */
847 static int ieee80211_qos_convert_ac_to_parameters(struct
848                                                   ieee80211_qos_parameter_info
849                                                   *param_elm, struct
850                                                   ieee80211_qos_parameters
851                                                   *qos_param)
852 {
853         int rc = 0;
854         int i;
855         struct ieee80211_qos_ac_parameter *ac_params;
856         u32 txop;
857         u8 cw_min;
858         u8 cw_max;
859
860         for (i = 0; i < QOS_QUEUE_NUM; i++) {
861                 ac_params = &(param_elm->ac_params_record[i]);
862
863                 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
864                 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
865
866                 cw_min = ac_params->ecw_min_max & 0x0F;
867                 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
868
869                 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
870                 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
871
872                 qos_param->flag[i] =
873                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
874
875                 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
876                 qos_param->tx_op_limit[i] = (u16) txop;
877         }
878         return rc;
879 }
880
881 /*
882  * we have a generic data element which it may contain QoS information or
883  * parameters element. check the information element length to decide
884  * which type to read
885  */
886 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
887                                              *info_element,
888                                              struct ieee80211_network *network)
889 {
890         int rc = 0;
891         struct ieee80211_qos_parameters *qos_param = NULL;
892         struct ieee80211_qos_information_element qos_info_element;
893
894         rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
895
896         if (rc == 0) {
897                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
898                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
899         } else {
900                 struct ieee80211_qos_parameter_info param_element;
901
902                 rc = ieee80211_read_qos_param_element(&param_element,
903                                                       info_element);
904                 if (rc == 0) {
905                         qos_param = &(network->qos_data.parameters);
906                         ieee80211_qos_convert_ac_to_parameters(&param_element,
907                                                                qos_param);
908                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
909                         network->qos_data.param_count =
910                             param_element.info_element.ac_info & 0x0F;
911                 }
912         }
913
914         if (rc == 0) {
915                 IEEE80211_DEBUG_QOS("QoS is supported\n");
916                 network->qos_data.supported = 1;
917         }
918         return rc;
919 }
920
921 static int ieee80211_parse_info_param(struct ieee80211_info_element
922                                       *info_element, u16 length,
923                                       struct ieee80211_network *network)
924 {
925         u8 i;
926 #ifdef CONFIG_IEEE80211_DEBUG
927         char rates_str[64];
928         char *p;
929 #endif
930
931         while (length >= sizeof(*info_element)) {
932                 if (sizeof(*info_element) + info_element->len > length) {
933                         IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
934                                              "info_element->len + 2 > left : "
935                                              "info_element->len+2=%zd left=%d, id=%d.\n",
936                                              info_element->len +
937                                              sizeof(*info_element),
938                                              length, info_element->id);
939                         return 1;
940                 }
941
942                 switch (info_element->id) {
943                 case MFIE_TYPE_SSID:
944                         if (ieee80211_is_empty_essid(info_element->data,
945                                                      info_element->len)) {
946                                 network->flags |= NETWORK_EMPTY_ESSID;
947                                 break;
948                         }
949
950                         network->ssid_len = min(info_element->len,
951                                                 (u8) IW_ESSID_MAX_SIZE);
952                         memcpy(network->ssid, info_element->data,
953                                network->ssid_len);
954                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
955                                 memset(network->ssid + network->ssid_len, 0,
956                                        IW_ESSID_MAX_SIZE - network->ssid_len);
957
958                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
959                                              network->ssid, network->ssid_len);
960                         break;
961
962                 case MFIE_TYPE_RATES:
963 #ifdef CONFIG_IEEE80211_DEBUG
964                         p = rates_str;
965 #endif
966                         network->rates_len = min(info_element->len,
967                                                  MAX_RATES_LENGTH);
968                         for (i = 0; i < network->rates_len; i++) {
969                                 network->rates[i] = info_element->data[i];
970 #ifdef CONFIG_IEEE80211_DEBUG
971                                 p += snprintf(p, sizeof(rates_str) -
972                                               (p - rates_str), "%02X ",
973                                               network->rates[i]);
974 #endif
975                                 if (ieee80211_is_ofdm_rate
976                                     (info_element->data[i])) {
977                                         network->flags |= NETWORK_HAS_OFDM;
978                                         if (info_element->data[i] &
979                                             IEEE80211_BASIC_RATE_MASK)
980                                                 network->flags &=
981                                                     ~NETWORK_HAS_CCK;
982                                 }
983                         }
984
985                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
986                                              rates_str, network->rates_len);
987                         break;
988
989                 case MFIE_TYPE_RATES_EX:
990 #ifdef CONFIG_IEEE80211_DEBUG
991                         p = rates_str;
992 #endif
993                         network->rates_ex_len = min(info_element->len,
994                                                     MAX_RATES_EX_LENGTH);
995                         for (i = 0; i < network->rates_ex_len; i++) {
996                                 network->rates_ex[i] = info_element->data[i];
997 #ifdef CONFIG_IEEE80211_DEBUG
998                                 p += snprintf(p, sizeof(rates_str) -
999                                               (p - rates_str), "%02X ",
1000                                               network->rates[i]);
1001 #endif
1002                                 if (ieee80211_is_ofdm_rate
1003                                     (info_element->data[i])) {
1004                                         network->flags |= NETWORK_HAS_OFDM;
1005                                         if (info_element->data[i] &
1006                                             IEEE80211_BASIC_RATE_MASK)
1007                                                 network->flags &=
1008                                                     ~NETWORK_HAS_CCK;
1009                                 }
1010                         }
1011
1012                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1013                                              rates_str, network->rates_ex_len);
1014                         break;
1015
1016                 case MFIE_TYPE_DS_SET:
1017                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1018                                              info_element->data[0]);
1019                         network->channel = info_element->data[0];
1020                         break;
1021
1022                 case MFIE_TYPE_FH_SET:
1023                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1024                         break;
1025
1026                 case MFIE_TYPE_CF_SET:
1027                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1028                         break;
1029
1030                 case MFIE_TYPE_TIM:
1031                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: ignored\n");
1032                         break;
1033
1034                 case MFIE_TYPE_ERP_INFO:
1035                         network->erp_value = info_element->data[0];
1036                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1037                                              network->erp_value);
1038                         break;
1039
1040                 case MFIE_TYPE_IBSS_SET:
1041                         network->atim_window = info_element->data[0];
1042                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1043                                              network->atim_window);
1044                         break;
1045
1046                 case MFIE_TYPE_CHALLENGE:
1047                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1048                         break;
1049
1050                 case MFIE_TYPE_GENERIC:
1051                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1052                                              info_element->len);
1053                         if (!ieee80211_parse_qos_info_param_IE(info_element,
1054                                                                network))
1055                                 break;
1056
1057                         if (info_element->len >= 4 &&
1058                             info_element->data[0] == 0x00 &&
1059                             info_element->data[1] == 0x50 &&
1060                             info_element->data[2] == 0xf2 &&
1061                             info_element->data[3] == 0x01) {
1062                                 network->wpa_ie_len = min(info_element->len + 2,
1063                                                           MAX_WPA_IE_LEN);
1064                                 memcpy(network->wpa_ie, info_element,
1065                                        network->wpa_ie_len);
1066                         }
1067                         break;
1068
1069                 case MFIE_TYPE_RSN:
1070                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1071                                              info_element->len);
1072                         network->rsn_ie_len = min(info_element->len + 2,
1073                                                   MAX_WPA_IE_LEN);
1074                         memcpy(network->rsn_ie, info_element,
1075                                network->rsn_ie_len);
1076                         break;
1077
1078                 case MFIE_TYPE_QOS_PARAMETER:
1079                         printk(KERN_ERR
1080                                "QoS Error need to parse QOS_PARAMETER IE\n");
1081                         break;
1082
1083                 default:
1084                         IEEE80211_DEBUG_MGMT("unsupported IE %d\n",
1085                                              info_element->id);
1086                         break;
1087                 }
1088
1089                 length -= sizeof(*info_element) + info_element->len;
1090                 info_element =
1091                     (struct ieee80211_info_element *)&info_element->
1092                     data[info_element->len];
1093         }
1094
1095         return 0;
1096 }
1097
1098 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1099                                        *frame, struct ieee80211_rx_stats *stats)
1100 {
1101         struct ieee80211_network network_resp;
1102         struct ieee80211_network *network = &network_resp;
1103         struct net_device *dev = ieee->dev;
1104
1105         network->flags = 0;
1106         network->qos_data.active = 0;
1107         network->qos_data.supported = 0;
1108         network->qos_data.param_count = 0;
1109         network->qos_data.old_param_count = 0;
1110
1111         //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1112         network->atim_window = le16_to_cpu(frame->aid);
1113         network->listen_interval = le16_to_cpu(frame->status);
1114         memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1115         network->capability = le16_to_cpu(frame->capability);
1116         network->last_scanned = jiffies;
1117         network->rates_len = network->rates_ex_len = 0;
1118         network->last_associate = 0;
1119         network->ssid_len = 0;
1120         network->erp_value =
1121             (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1122
1123         if (stats->freq == IEEE80211_52GHZ_BAND) {
1124                 /* for A band (No DS info) */
1125                 network->channel = stats->received_channel;
1126         } else
1127                 network->flags |= NETWORK_HAS_CCK;
1128
1129         network->wpa_ie_len = 0;
1130         network->rsn_ie_len = 0;
1131
1132         if (ieee80211_parse_info_param
1133             (frame->info_element, stats->len - sizeof(*frame), network))
1134                 return 1;
1135
1136         network->mode = 0;
1137         if (stats->freq == IEEE80211_52GHZ_BAND)
1138                 network->mode = IEEE_A;
1139         else {
1140                 if (network->flags & NETWORK_HAS_OFDM)
1141                         network->mode |= IEEE_G;
1142                 if (network->flags & NETWORK_HAS_CCK)
1143                         network->mode |= IEEE_B;
1144         }
1145
1146         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1147                 network->flags |= NETWORK_EMPTY_ESSID;
1148
1149         memcpy(&network->stats, stats, sizeof(network->stats));
1150
1151         if (ieee->handle_assoc_response != NULL)
1152                 ieee->handle_assoc_response(dev, frame, network);
1153
1154         return 0;
1155 }
1156
1157 /***************************************************/
1158
1159 static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1160                                          *beacon,
1161                                          struct ieee80211_network *network,
1162                                          struct ieee80211_rx_stats *stats)
1163 {
1164         network->qos_data.active = 0;
1165         network->qos_data.supported = 0;
1166         network->qos_data.param_count = 0;
1167         network->qos_data.old_param_count = 0;
1168
1169         /* Pull out fixed field data */
1170         memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1171         network->capability = le16_to_cpu(beacon->capability);
1172         network->last_scanned = jiffies;
1173         network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1174         network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1175         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1176         /* Where to pull this? beacon->listen_interval; */
1177         network->listen_interval = 0x0A;
1178         network->rates_len = network->rates_ex_len = 0;
1179         network->last_associate = 0;
1180         network->ssid_len = 0;
1181         network->flags = 0;
1182         network->atim_window = 0;
1183         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1184             0x3 : 0x0;
1185
1186         if (stats->freq == IEEE80211_52GHZ_BAND) {
1187                 /* for A band (No DS info) */
1188                 network->channel = stats->received_channel;
1189         } else
1190                 network->flags |= NETWORK_HAS_CCK;
1191
1192         network->wpa_ie_len = 0;
1193         network->rsn_ie_len = 0;
1194
1195         if (ieee80211_parse_info_param
1196             (beacon->info_element, stats->len - sizeof(*beacon), network))
1197                 return 1;
1198
1199         network->mode = 0;
1200         if (stats->freq == IEEE80211_52GHZ_BAND)
1201                 network->mode = IEEE_A;
1202         else {
1203                 if (network->flags & NETWORK_HAS_OFDM)
1204                         network->mode |= IEEE_G;
1205                 if (network->flags & NETWORK_HAS_CCK)
1206                         network->mode |= IEEE_B;
1207         }
1208
1209         if (network->mode == 0) {
1210                 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1211                                      "network.\n",
1212                                      escape_essid(network->ssid,
1213                                                   network->ssid_len),
1214                                      MAC_ARG(network->bssid));
1215                 return 1;
1216         }
1217
1218         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1219                 network->flags |= NETWORK_EMPTY_ESSID;
1220
1221         memcpy(&network->stats, stats, sizeof(network->stats));
1222
1223         return 0;
1224 }
1225
1226 static inline int is_same_network(struct ieee80211_network *src,
1227                                   struct ieee80211_network *dst)
1228 {
1229         /* A network is only a duplicate if the channel, BSSID, and ESSID
1230          * all match.  We treat all <hidden> with the same BSSID and channel
1231          * as one network */
1232         return ((src->ssid_len == dst->ssid_len) &&
1233                 (src->channel == dst->channel) &&
1234                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
1235                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1236 }
1237
1238 static inline void update_network(struct ieee80211_network *dst,
1239                                   struct ieee80211_network *src)
1240 {
1241         int qos_active;
1242         u8 old_param;
1243
1244         memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1245         dst->capability = src->capability;
1246         memcpy(dst->rates, src->rates, src->rates_len);
1247         dst->rates_len = src->rates_len;
1248         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1249         dst->rates_ex_len = src->rates_ex_len;
1250
1251         dst->mode = src->mode;
1252         dst->flags = src->flags;
1253         dst->time_stamp[0] = src->time_stamp[0];
1254         dst->time_stamp[1] = src->time_stamp[1];
1255
1256         dst->beacon_interval = src->beacon_interval;
1257         dst->listen_interval = src->listen_interval;
1258         dst->atim_window = src->atim_window;
1259         dst->erp_value = src->erp_value;
1260
1261         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1262         dst->wpa_ie_len = src->wpa_ie_len;
1263         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1264         dst->rsn_ie_len = src->rsn_ie_len;
1265
1266         dst->last_scanned = jiffies;
1267         qos_active = src->qos_data.active;
1268         old_param = dst->qos_data.old_param_count;
1269         if (dst->flags & NETWORK_HAS_QOS_MASK)
1270                 memcpy(&dst->qos_data, &src->qos_data,
1271                        sizeof(struct ieee80211_qos_data));
1272         else {
1273                 dst->qos_data.supported = src->qos_data.supported;
1274                 dst->qos_data.param_count = src->qos_data.param_count;
1275         }
1276
1277         if (dst->qos_data.supported == 1) {
1278                 if (dst->ssid_len)
1279                         IEEE80211_DEBUG_QOS
1280                             ("QoS the network %s is QoS supported\n",
1281                              dst->ssid);
1282                 else
1283                         IEEE80211_DEBUG_QOS
1284                             ("QoS the network is QoS supported\n");
1285         }
1286         dst->qos_data.active = qos_active;
1287         dst->qos_data.old_param_count = old_param;
1288
1289         /* dst->last_associate is not overwritten */
1290 }
1291
1292 static inline int is_beacon(int fc)
1293 {
1294         return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1295 }
1296
1297 static inline void ieee80211_process_probe_response(struct ieee80211_device
1298                                                     *ieee, struct
1299                                                     ieee80211_probe_response
1300                                                     *beacon, struct ieee80211_rx_stats
1301                                                     *stats)
1302 {
1303         struct net_device *dev = ieee->dev;
1304         struct ieee80211_network network;
1305         struct ieee80211_network *target;
1306         struct ieee80211_network *oldest = NULL;
1307 #ifdef CONFIG_IEEE80211_DEBUG
1308         struct ieee80211_info_element *info_element = beacon->info_element;
1309 #endif
1310         unsigned long flags;
1311
1312         IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1313                              "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1314                              escape_essid(info_element->data,
1315                                           info_element->len),
1316                              MAC_ARG(beacon->header.addr3),
1317                              (beacon->capability & (1 << 0xf)) ? '1' : '0',
1318                              (beacon->capability & (1 << 0xe)) ? '1' : '0',
1319                              (beacon->capability & (1 << 0xd)) ? '1' : '0',
1320                              (beacon->capability & (1 << 0xc)) ? '1' : '0',
1321                              (beacon->capability & (1 << 0xb)) ? '1' : '0',
1322                              (beacon->capability & (1 << 0xa)) ? '1' : '0',
1323                              (beacon->capability & (1 << 0x9)) ? '1' : '0',
1324                              (beacon->capability & (1 << 0x8)) ? '1' : '0',
1325                              (beacon->capability & (1 << 0x7)) ? '1' : '0',
1326                              (beacon->capability & (1 << 0x6)) ? '1' : '0',
1327                              (beacon->capability & (1 << 0x5)) ? '1' : '0',
1328                              (beacon->capability & (1 << 0x4)) ? '1' : '0',
1329                              (beacon->capability & (1 << 0x3)) ? '1' : '0',
1330                              (beacon->capability & (1 << 0x2)) ? '1' : '0',
1331                              (beacon->capability & (1 << 0x1)) ? '1' : '0',
1332                              (beacon->capability & (1 << 0x0)) ? '1' : '0');
1333
1334         if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1335                 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1336                                      escape_essid(info_element->data,
1337                                                   info_element->len),
1338                                      MAC_ARG(beacon->header.addr3),
1339                                      is_beacon(le16_to_cpu
1340                                                (beacon->header.
1341                                                 frame_ctl)) ?
1342                                      "BEACON" : "PROBE RESPONSE");
1343                 return;
1344         }
1345
1346         /* The network parsed correctly -- so now we scan our known networks
1347          * to see if we can find it in our list.
1348          *
1349          * NOTE:  This search is definitely not optimized.  Once its doing
1350          *        the "right thing" we'll optimize it for efficiency if
1351          *        necessary */
1352
1353         /* Search for this entry in the list and update it if it is
1354          * already there. */
1355
1356         spin_lock_irqsave(&ieee->lock, flags);
1357
1358         list_for_each_entry(target, &ieee->network_list, list) {
1359                 if (is_same_network(target, &network))
1360                         break;
1361
1362                 if ((oldest == NULL) ||
1363                     (target->last_scanned < oldest->last_scanned))
1364                         oldest = target;
1365         }
1366
1367         /* If we didn't find a match, then get a new network slot to initialize
1368          * with this beacon's information */
1369         if (&target->list == &ieee->network_list) {
1370                 if (list_empty(&ieee->network_free_list)) {
1371                         /* If there are no more slots, expire the oldest */
1372                         list_del(&oldest->list);
1373                         target = oldest;
1374                         IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1375                                              "network list.\n",
1376                                              escape_essid(target->ssid,
1377                                                           target->ssid_len),
1378                                              MAC_ARG(target->bssid));
1379                 } else {
1380                         /* Otherwise just pull from the free list */
1381                         target = list_entry(ieee->network_free_list.next,
1382                                             struct ieee80211_network, list);
1383                         list_del(ieee->network_free_list.next);
1384                 }
1385
1386 #ifdef CONFIG_IEEE80211_DEBUG
1387                 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1388                                      escape_essid(network.ssid,
1389                                                   network.ssid_len),
1390                                      MAC_ARG(network.bssid),
1391                                      is_beacon(le16_to_cpu
1392                                                (beacon->header.
1393                                                 frame_ctl)) ?
1394                                      "BEACON" : "PROBE RESPONSE");
1395 #endif
1396                 memcpy(target, &network, sizeof(*target));
1397                 list_add_tail(&target->list, &ieee->network_list);
1398         } else {
1399                 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1400                                      escape_essid(target->ssid,
1401                                                   target->ssid_len),
1402                                      MAC_ARG(target->bssid),
1403                                      is_beacon(le16_to_cpu
1404                                                (beacon->header.
1405                                                 frame_ctl)) ?
1406                                      "BEACON" : "PROBE RESPONSE");
1407                 update_network(target, &network);
1408         }
1409
1410         spin_unlock_irqrestore(&ieee->lock, flags);
1411
1412         if (is_beacon(le16_to_cpu(beacon->header.frame_ctl))) {
1413                 if (ieee->handle_beacon != NULL)
1414                         ieee->handle_beacon(dev, beacon, &network);
1415         } else {
1416                 if (ieee->handle_probe_response != NULL)
1417                         ieee->handle_probe_response(dev, beacon, &network);
1418         }
1419 }
1420
1421 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1422                       struct ieee80211_hdr_4addr *header,
1423                       struct ieee80211_rx_stats *stats)
1424 {
1425         switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1426         case IEEE80211_STYPE_ASSOC_RESP:
1427                 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1428                                      WLAN_FC_GET_STYPE(le16_to_cpu
1429                                                        (header->frame_ctl)));
1430                 ieee80211_handle_assoc_resp(ieee,
1431                                             (struct ieee80211_assoc_response *)
1432                                             header, stats);
1433                 break;
1434
1435         case IEEE80211_STYPE_REASSOC_RESP:
1436                 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1437                                      WLAN_FC_GET_STYPE(le16_to_cpu
1438                                                        (header->frame_ctl)));
1439                 break;
1440
1441         case IEEE80211_STYPE_PROBE_REQ:
1442                 IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
1443                                      WLAN_FC_GET_STYPE(le16_to_cpu
1444                                                        (header->frame_ctl)));
1445
1446                 if (ieee->handle_probe_request != NULL)
1447                         ieee->handle_probe_request(ieee->dev,
1448                                                    (struct
1449                                                     ieee80211_probe_request *)
1450                                                    header, stats);
1451                 break;
1452
1453         case IEEE80211_STYPE_PROBE_RESP:
1454                 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1455                                      WLAN_FC_GET_STYPE(le16_to_cpu
1456                                                        (header->frame_ctl)));
1457                 IEEE80211_DEBUG_SCAN("Probe response\n");
1458                 ieee80211_process_probe_response(ieee,
1459                                                  (struct
1460                                                   ieee80211_probe_response *)
1461                                                  header, stats);
1462                 break;
1463
1464         case IEEE80211_STYPE_BEACON:
1465                 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1466                                      WLAN_FC_GET_STYPE(le16_to_cpu
1467                                                        (header->frame_ctl)));
1468                 IEEE80211_DEBUG_SCAN("Beacon\n");
1469                 ieee80211_process_probe_response(ieee,
1470                                                  (struct
1471                                                   ieee80211_probe_response *)
1472                                                  header, stats);
1473                 break;
1474         case IEEE80211_STYPE_AUTH:
1475
1476                 IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
1477                                      WLAN_FC_GET_STYPE(le16_to_cpu
1478                                                        (header->frame_ctl)));
1479
1480                 if (ieee->handle_auth != NULL)
1481                         ieee->handle_auth(ieee->dev,
1482                                           (struct ieee80211_auth *)header);
1483                 break;
1484
1485         case IEEE80211_STYPE_DISASSOC:
1486                 if (ieee->handle_disassoc != NULL)
1487                         ieee->handle_disassoc(ieee->dev,
1488                                               (struct ieee80211_disassoc *)
1489                                               header);
1490                 break;
1491
1492         case IEEE80211_STYPE_DEAUTH:
1493                 printk("DEAUTH from AP\n");
1494                 if (ieee->handle_deauth != NULL)
1495                         ieee->handle_deauth(ieee->dev, (struct ieee80211_auth *)
1496                                             header);
1497                 break;
1498         default:
1499                 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1500                                      WLAN_FC_GET_STYPE(le16_to_cpu
1501                                                        (header->frame_ctl)));
1502                 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1503                                   ieee->dev->name,
1504                                   WLAN_FC_GET_STYPE(le16_to_cpu
1505                                                     (header->frame_ctl)));
1506                 break;
1507         }
1508 }
1509
1510 EXPORT_SYMBOL(ieee80211_rx_mgt);
1511 EXPORT_SYMBOL(ieee80211_rx);