Merge branch 'upstream-fixes'
[sfrench/cifs-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 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                     !compare_ether_addr(entry->src_addr, src) &&
80                     !compare_ether_addr(entry->dst_addr, dst))
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 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             !compare_ether_addr(hdr->addr1, dev->dev_addr) &&
247             !compare_ether_addr(hdr->addr3, dev->dev_addr)) {
248                 /* ToDS frame with own addr BSSID and DA */
249         } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
250                    IEEE80211_FCTL_FROMDS &&
251                    !compare_ether_addr(hdr->addr1, dev->dev_addr)) {
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 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 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         int can_be_decrypted = 0;
354
355         hdr = (struct ieee80211_hdr_4addr *)skb->data;
356         stats = &ieee->stats;
357
358         if (skb->len < 10) {
359                 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
360                 goto rx_dropped;
361         }
362
363         fc = le16_to_cpu(hdr->frame_ctl);
364         type = WLAN_FC_GET_TYPE(fc);
365         stype = WLAN_FC_GET_STYPE(fc);
366         sc = le16_to_cpu(hdr->seq_ctl);
367         frag = WLAN_GET_SEQ_FRAG(sc);
368         hdrlen = ieee80211_get_hdrlen(fc);
369
370         /* Put this code here so that we avoid duplicating it in all
371          * Rx paths. - Jean II */
372 #ifdef CONFIG_WIRELESS_EXT
373 #ifdef IW_WIRELESS_SPY          /* defined in iw_handler.h */
374         /* If spy monitoring on */
375         if (ieee->spy_data.spy_number > 0) {
376                 struct iw_quality wstats;
377
378                 wstats.updated = 0;
379                 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
380                         wstats.level = rx_stats->rssi;
381                         wstats.updated |= IW_QUAL_LEVEL_UPDATED;
382                 } else
383                         wstats.updated |= IW_QUAL_LEVEL_INVALID;
384
385                 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
386                         wstats.noise = rx_stats->noise;
387                         wstats.updated |= IW_QUAL_NOISE_UPDATED;
388                 } else
389                         wstats.updated |= IW_QUAL_NOISE_INVALID;
390
391                 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
392                         wstats.qual = rx_stats->signal;
393                         wstats.updated |= IW_QUAL_QUAL_UPDATED;
394                 } else
395                         wstats.updated |= IW_QUAL_QUAL_INVALID;
396
397                 /* Update spy records */
398                 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
399         }
400 #endif                          /* IW_WIRELESS_SPY */
401 #endif                          /* CONFIG_WIRELESS_EXT */
402
403 #ifdef NOT_YET
404         hostap_update_rx_stats(local->ap, hdr, rx_stats);
405 #endif
406
407         if (ieee->iw_mode == IW_MODE_MONITOR) {
408                 ieee80211_monitor_rx(ieee, skb, rx_stats);
409                 stats->rx_packets++;
410                 stats->rx_bytes += skb->len;
411                 return 1;
412         }
413
414         can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
415                             is_broadcast_ether_addr(hdr->addr2)) ?
416             ieee->host_mc_decrypt : ieee->host_decrypt;
417
418         if (can_be_decrypted) {
419                 int idx = 0;
420                 if (skb->len >= hdrlen + 3) {
421                         /* Top two-bits of byte 3 are the key index */
422                         idx = skb->data[hdrlen + 3] >> 6;
423                 }
424
425                 /* ieee->crypt[] is WEP_KEY (4) in length.  Given that idx
426                  * is only allowed 2-bits of storage, no value of idx can
427                  * be provided via above code that would result in idx
428                  * being out of range */
429                 crypt = ieee->crypt[idx];
430
431 #ifdef NOT_YET
432                 sta = NULL;
433
434                 /* Use station specific key to override default keys if the
435                  * receiver address is a unicast address ("individual RA"). If
436                  * bcrx_sta_key parameter is set, station specific key is used
437                  * even with broad/multicast targets (this is against IEEE
438                  * 802.11, but makes it easier to use different keys with
439                  * stations that do not support WEP key mapping). */
440
441                 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
442                         (void)hostap_handle_sta_crypto(local, hdr, &crypt,
443                                                        &sta);
444 #endif
445
446                 /* allow NULL decrypt to indicate an station specific override
447                  * for default encryption */
448                 if (crypt && (crypt->ops == NULL ||
449                               crypt->ops->decrypt_mpdu == NULL))
450                         crypt = NULL;
451
452                 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
453                         /* This seems to be triggered by some (multicast?)
454                          * frames from other than current BSS, so just drop the
455                          * frames silently instead of filling system log with
456                          * these reports. */
457                         IEEE80211_DEBUG_DROP("Decryption failed (not set)"
458                                              " (SA=" MAC_FMT ")\n",
459                                              MAC_ARG(hdr->addr2));
460                         ieee->ieee_stats.rx_discards_undecryptable++;
461                         goto rx_dropped;
462                 }
463         }
464 #ifdef NOT_YET
465         if (type != WLAN_FC_TYPE_DATA) {
466                 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
467                     fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
468                     (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
469                         printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
470                                "from " MAC_FMT "\n", dev->name,
471                                MAC_ARG(hdr->addr2));
472                         /* TODO: could inform hostapd about this so that it
473                          * could send auth failure report */
474                         goto rx_dropped;
475                 }
476
477                 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
478                         goto rx_dropped;
479                 else
480                         goto rx_exit;
481         }
482 #endif
483
484         /* Data frame - extract src/dst addresses */
485         if (skb->len < IEEE80211_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 < IEEE80211_4ADDR_LEN)
499                         goto rx_dropped;
500                 memcpy(dst, hdr->addr3, ETH_ALEN);
501                 memcpy(src, hdr->addr4, ETH_ALEN);
502                 break;
503         case 0:
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             && !compare_ether_addr(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         dev->last_rx = jiffies;
529
530 #ifdef NOT_YET
531         if ((ieee->iw_mode == IW_MODE_MASTER ||
532              ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
533                 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
534                                              wds != NULL)) {
535                 case AP_RX_CONTINUE_NOT_AUTHORIZED:
536                         frame_authorized = 0;
537                         break;
538                 case AP_RX_CONTINUE:
539                         frame_authorized = 1;
540                         break;
541                 case AP_RX_DROP:
542                         goto rx_dropped;
543                 case AP_RX_EXIT:
544                         goto rx_exit;
545                 }
546         }
547 #endif
548
549         /* Nullfunc frames may have PS-bit set, so they must be passed to
550          * hostap_handle_sta_rx() before being dropped here. */
551
552         stype &= ~IEEE80211_STYPE_QOS_DATA;
553
554         if (stype != IEEE80211_STYPE_DATA &&
555             stype != IEEE80211_STYPE_DATA_CFACK &&
556             stype != IEEE80211_STYPE_DATA_CFPOLL &&
557             stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
558                 if (stype != IEEE80211_STYPE_NULLFUNC)
559                         IEEE80211_DEBUG_DROP("RX: dropped data frame "
560                                              "with no data (type=0x%02x, "
561                                              "subtype=0x%02x, len=%d)\n",
562                                              type, stype, skb->len);
563                 goto rx_dropped;
564         }
565
566         /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
567
568         if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
569             (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
570                 goto rx_dropped;
571
572         hdr = (struct ieee80211_hdr_4addr *)skb->data;
573
574         /* skb: hdr + (possibly fragmented) plaintext payload */
575         // PR: FIXME: hostap has additional conditions in the "if" below:
576         // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
577         if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
578                 int flen;
579                 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
580                 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
581
582                 if (!frag_skb) {
583                         IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
584                                         "Rx cannot get skb from fragment "
585                                         "cache (morefrag=%d seq=%u frag=%u)\n",
586                                         (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
587                                         WLAN_GET_SEQ_SEQ(sc), frag);
588                         goto rx_dropped;
589                 }
590
591                 flen = skb->len;
592                 if (frag != 0)
593                         flen -= hdrlen;
594
595                 if (frag_skb->tail + flen > frag_skb->end) {
596                         printk(KERN_WARNING "%s: host decrypted and "
597                                "reassembled frame did not fit skb\n",
598                                dev->name);
599                         ieee80211_frag_cache_invalidate(ieee, hdr);
600                         goto rx_dropped;
601                 }
602
603                 if (frag == 0) {
604                         /* copy first fragment (including full headers) into
605                          * beginning of the fragment cache skb */
606                         memcpy(skb_put(frag_skb, flen), skb->data, flen);
607                 } else {
608                         /* append frame payload to the end of the fragment
609                          * cache skb */
610                         memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
611                                flen);
612                 }
613                 dev_kfree_skb_any(skb);
614                 skb = NULL;
615
616                 if (fc & IEEE80211_FCTL_MOREFRAGS) {
617                         /* more fragments expected - leave the skb in fragment
618                          * cache for now; it will be delivered to upper layers
619                          * after all fragments have been received */
620                         goto rx_exit;
621                 }
622
623                 /* this was the last fragment and the frame will be
624                  * delivered, so remove skb from fragment cache */
625                 skb = frag_skb;
626                 hdr = (struct ieee80211_hdr_4addr *)skb->data;
627                 ieee80211_frag_cache_invalidate(ieee, hdr);
628         }
629
630         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
631          * encrypted/authenticated */
632         if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
633             ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
634                 goto rx_dropped;
635
636         hdr = (struct ieee80211_hdr_4addr *)skb->data;
637         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
638                 if (            /*ieee->ieee802_1x && */
639                            ieee80211_is_eapol_frame(ieee, skb)) {
640                         /* pass unencrypted EAPOL frames even if encryption is
641                          * configured */
642                 } else {
643                         IEEE80211_DEBUG_DROP("encryption configured, but RX "
644                                              "frame not encrypted (SA=" MAC_FMT
645                                              ")\n", MAC_ARG(hdr->addr2));
646                         goto rx_dropped;
647                 }
648         }
649
650         if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
651             !ieee80211_is_eapol_frame(ieee, skb)) {
652                 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
653                                      "frame from " MAC_FMT
654                                      " (drop_unencrypted=1)\n",
655                                      MAC_ARG(hdr->addr2));
656                 goto rx_dropped;
657         }
658
659         /* skb: hdr + (possible reassembled) full plaintext payload */
660
661         payload = skb->data + hdrlen;
662         ethertype = (payload[6] << 8) | payload[7];
663
664 #ifdef NOT_YET
665         /* If IEEE 802.1X is used, check whether the port is authorized to send
666          * the received frame. */
667         if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
668                 if (ethertype == ETH_P_PAE) {
669                         printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
670                                dev->name);
671                         if (ieee->hostapd && ieee->apdev) {
672                                 /* Send IEEE 802.1X frames to the user
673                                  * space daemon for processing */
674                                 prism2_rx_80211(ieee->apdev, skb, rx_stats,
675                                                 PRISM2_RX_MGMT);
676                                 ieee->apdevstats.rx_packets++;
677                                 ieee->apdevstats.rx_bytes += skb->len;
678                                 goto rx_exit;
679                         }
680                 } else if (!frame_authorized) {
681                         printk(KERN_DEBUG "%s: dropped frame from "
682                                "unauthorized port (IEEE 802.1X): "
683                                "ethertype=0x%04x\n", dev->name, ethertype);
684                         goto rx_dropped;
685                 }
686         }
687 #endif
688
689         /* convert hdr + possible LLC headers into Ethernet header */
690         if (skb->len - hdrlen >= 8 &&
691             ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
692               ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
693              memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
694                 /* remove RFC1042 or Bridge-Tunnel encapsulation and
695                  * replace EtherType */
696                 skb_pull(skb, hdrlen + SNAP_SIZE);
697                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
698                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
699         } else {
700                 u16 len;
701                 /* Leave Ethernet header part of hdr and full payload */
702                 skb_pull(skb, hdrlen);
703                 len = htons(skb->len);
704                 memcpy(skb_push(skb, 2), &len, 2);
705                 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
706                 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
707         }
708
709 #ifdef NOT_YET
710         if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
711                     IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
712                 /* Non-standard frame: get addr4 from its bogus location after
713                  * the payload */
714                 memcpy(skb->data + ETH_ALEN,
715                        skb->data + skb->len - ETH_ALEN, ETH_ALEN);
716                 skb_trim(skb, skb->len - ETH_ALEN);
717         }
718 #endif
719
720         stats->rx_packets++;
721         stats->rx_bytes += skb->len;
722
723 #ifdef NOT_YET
724         if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
725                 if (dst[0] & 0x01) {
726                         /* copy multicast frame both to the higher layers and
727                          * to the wireless media */
728                         ieee->ap->bridged_multicast++;
729                         skb2 = skb_clone(skb, GFP_ATOMIC);
730                         if (skb2 == NULL)
731                                 printk(KERN_DEBUG "%s: skb_clone failed for "
732                                        "multicast frame\n", dev->name);
733                 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
734                         /* send frame directly to the associated STA using
735                          * wireless media and not passing to higher layers */
736                         ieee->ap->bridged_unicast++;
737                         skb2 = skb;
738                         skb = NULL;
739                 }
740         }
741
742         if (skb2 != NULL) {
743                 /* send to wireless media */
744                 skb2->protocol = __constant_htons(ETH_P_802_3);
745                 skb2->mac.raw = skb2->nh.raw = skb2->data;
746                 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
747                 skb2->dev = dev;
748                 dev_queue_xmit(skb2);
749         }
750 #endif
751
752         if (skb) {
753                 skb->protocol = eth_type_trans(skb, dev);
754                 memset(skb->cb, 0, sizeof(skb->cb));
755                 skb->dev = dev;
756                 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
757                 if (netif_rx(skb) == NET_RX_DROP) {
758                         /* netif_rx always succeeds, but it might drop
759                          * the packet.  If it drops the packet, we log that
760                          * in our stats. */
761                         IEEE80211_DEBUG_DROP
762                             ("RX: netif_rx dropped the packet\n");
763                         stats->rx_dropped++;
764                 }
765         }
766
767       rx_exit:
768 #ifdef NOT_YET
769         if (sta)
770                 hostap_handle_sta_release(sta);
771 #endif
772         return 1;
773
774       rx_dropped:
775         stats->rx_dropped++;
776
777         /* Returning 0 indicates to caller that we have not handled the SKB--
778          * so it is still allocated and can be used again by underlying
779          * hardware as a DMA target */
780         return 0;
781 }
782
783 #define MGMT_FRAME_FIXED_PART_LENGTH            0x24
784
785 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
786
787 /*
788 * Make ther structure we read from the beacon packet has
789 * the right values
790 */
791 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
792                                      *info_element, int sub_type)
793 {
794
795         if (info_element->qui_subtype != sub_type)
796                 return -1;
797         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
798                 return -1;
799         if (info_element->qui_type != QOS_OUI_TYPE)
800                 return -1;
801         if (info_element->version != QOS_VERSION_1)
802                 return -1;
803
804         return 0;
805 }
806
807 /*
808  * Parse a QoS parameter element
809  */
810 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
811                                             *element_param, struct ieee80211_info_element
812                                             *info_element)
813 {
814         int ret = 0;
815         u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
816
817         if ((info_element == NULL) || (element_param == NULL))
818                 return -1;
819
820         if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
821                 memcpy(element_param->info_element.qui, info_element->data,
822                        info_element->len);
823                 element_param->info_element.elementID = info_element->id;
824                 element_param->info_element.length = info_element->len;
825         } else
826                 ret = -1;
827         if (ret == 0)
828                 ret = ieee80211_verify_qos_info(&element_param->info_element,
829                                                 QOS_OUI_PARAM_SUB_TYPE);
830         return ret;
831 }
832
833 /*
834  * Parse a QoS information element
835  */
836 static int ieee80211_read_qos_info_element(struct
837                                            ieee80211_qos_information_element
838                                            *element_info, struct ieee80211_info_element
839                                            *info_element)
840 {
841         int ret = 0;
842         u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
843
844         if (element_info == NULL)
845                 return -1;
846         if (info_element == NULL)
847                 return -1;
848
849         if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
850                 memcpy(element_info->qui, info_element->data,
851                        info_element->len);
852                 element_info->elementID = info_element->id;
853                 element_info->length = info_element->len;
854         } else
855                 ret = -1;
856
857         if (ret == 0)
858                 ret = ieee80211_verify_qos_info(element_info,
859                                                 QOS_OUI_INFO_SUB_TYPE);
860         return ret;
861 }
862
863 /*
864  * Write QoS parameters from the ac parameters.
865  */
866 static int ieee80211_qos_convert_ac_to_parameters(struct
867                                                   ieee80211_qos_parameter_info
868                                                   *param_elm, struct
869                                                   ieee80211_qos_parameters
870                                                   *qos_param)
871 {
872         int rc = 0;
873         int i;
874         struct ieee80211_qos_ac_parameter *ac_params;
875         u32 txop;
876         u8 cw_min;
877         u8 cw_max;
878
879         for (i = 0; i < QOS_QUEUE_NUM; i++) {
880                 ac_params = &(param_elm->ac_params_record[i]);
881
882                 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
883                 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
884
885                 cw_min = ac_params->ecw_min_max & 0x0F;
886                 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
887
888                 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
889                 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
890
891                 qos_param->flag[i] =
892                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
893
894                 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
895                 qos_param->tx_op_limit[i] = (u16) txop;
896         }
897         return rc;
898 }
899
900 /*
901  * we have a generic data element which it may contain QoS information or
902  * parameters element. check the information element length to decide
903  * which type to read
904  */
905 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
906                                              *info_element,
907                                              struct ieee80211_network *network)
908 {
909         int rc = 0;
910         struct ieee80211_qos_parameters *qos_param = NULL;
911         struct ieee80211_qos_information_element qos_info_element;
912
913         rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
914
915         if (rc == 0) {
916                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
917                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
918         } else {
919                 struct ieee80211_qos_parameter_info param_element;
920
921                 rc = ieee80211_read_qos_param_element(&param_element,
922                                                       info_element);
923                 if (rc == 0) {
924                         qos_param = &(network->qos_data.parameters);
925                         ieee80211_qos_convert_ac_to_parameters(&param_element,
926                                                                qos_param);
927                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
928                         network->qos_data.param_count =
929                             param_element.info_element.ac_info & 0x0F;
930                 }
931         }
932
933         if (rc == 0) {
934                 IEEE80211_DEBUG_QOS("QoS is supported\n");
935                 network->qos_data.supported = 1;
936         }
937         return rc;
938 }
939
940 #ifdef CONFIG_IEEE80211_DEBUG
941 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
942
943 static const char *get_info_element_string(u16 id)
944 {
945         switch (id) {
946                 MFIE_STRING(SSID);
947                 MFIE_STRING(RATES);
948                 MFIE_STRING(FH_SET);
949                 MFIE_STRING(DS_SET);
950                 MFIE_STRING(CF_SET);
951                 MFIE_STRING(TIM);
952                 MFIE_STRING(IBSS_SET);
953                 MFIE_STRING(COUNTRY);
954                 MFIE_STRING(HOP_PARAMS);
955                 MFIE_STRING(HOP_TABLE);
956                 MFIE_STRING(REQUEST);
957                 MFIE_STRING(CHALLENGE);
958                 MFIE_STRING(POWER_CONSTRAINT);
959                 MFIE_STRING(POWER_CAPABILITY);
960                 MFIE_STRING(TPC_REQUEST);
961                 MFIE_STRING(TPC_REPORT);
962                 MFIE_STRING(SUPP_CHANNELS);
963                 MFIE_STRING(CSA);
964                 MFIE_STRING(MEASURE_REQUEST);
965                 MFIE_STRING(MEASURE_REPORT);
966                 MFIE_STRING(QUIET);
967                 MFIE_STRING(IBSS_DFS);
968                 MFIE_STRING(ERP_INFO);
969                 MFIE_STRING(RSN);
970                 MFIE_STRING(RATES_EX);
971                 MFIE_STRING(GENERIC);
972                 MFIE_STRING(QOS_PARAMETER);
973         default:
974                 return "UNKNOWN";
975         }
976 }
977 #endif
978
979 static int ieee80211_parse_info_param(struct ieee80211_info_element
980                                       *info_element, u16 length,
981                                       struct ieee80211_network *network)
982 {
983         u8 i;
984 #ifdef CONFIG_IEEE80211_DEBUG
985         char rates_str[64];
986         char *p;
987 #endif
988
989         while (length >= sizeof(*info_element)) {
990                 if (sizeof(*info_element) + info_element->len > length) {
991                         IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
992                                              "info_element->len + 2 > left : "
993                                              "info_element->len+2=%zd left=%d, id=%d.\n",
994                                              info_element->len +
995                                              sizeof(*info_element),
996                                              length, info_element->id);
997                         return 1;
998                 }
999
1000                 switch (info_element->id) {
1001                 case MFIE_TYPE_SSID:
1002                         if (ieee80211_is_empty_essid(info_element->data,
1003                                                      info_element->len)) {
1004                                 network->flags |= NETWORK_EMPTY_ESSID;
1005                                 break;
1006                         }
1007
1008                         network->ssid_len = min(info_element->len,
1009                                                 (u8) IW_ESSID_MAX_SIZE);
1010                         memcpy(network->ssid, info_element->data,
1011                                network->ssid_len);
1012                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
1013                                 memset(network->ssid + network->ssid_len, 0,
1014                                        IW_ESSID_MAX_SIZE - network->ssid_len);
1015
1016                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1017                                              network->ssid, network->ssid_len);
1018                         break;
1019
1020                 case MFIE_TYPE_RATES:
1021 #ifdef CONFIG_IEEE80211_DEBUG
1022                         p = rates_str;
1023 #endif
1024                         network->rates_len = min(info_element->len,
1025                                                  MAX_RATES_LENGTH);
1026                         for (i = 0; i < network->rates_len; i++) {
1027                                 network->rates[i] = info_element->data[i];
1028 #ifdef CONFIG_IEEE80211_DEBUG
1029                                 p += snprintf(p, sizeof(rates_str) -
1030                                               (p - rates_str), "%02X ",
1031                                               network->rates[i]);
1032 #endif
1033                                 if (ieee80211_is_ofdm_rate
1034                                     (info_element->data[i])) {
1035                                         network->flags |= NETWORK_HAS_OFDM;
1036                                         if (info_element->data[i] &
1037                                             IEEE80211_BASIC_RATE_MASK)
1038                                                 network->flags &=
1039                                                     ~NETWORK_HAS_CCK;
1040                                 }
1041                         }
1042
1043                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1044                                              rates_str, network->rates_len);
1045                         break;
1046
1047                 case MFIE_TYPE_RATES_EX:
1048 #ifdef CONFIG_IEEE80211_DEBUG
1049                         p = rates_str;
1050 #endif
1051                         network->rates_ex_len = min(info_element->len,
1052                                                     MAX_RATES_EX_LENGTH);
1053                         for (i = 0; i < network->rates_ex_len; i++) {
1054                                 network->rates_ex[i] = info_element->data[i];
1055 #ifdef CONFIG_IEEE80211_DEBUG
1056                                 p += snprintf(p, sizeof(rates_str) -
1057                                               (p - rates_str), "%02X ",
1058                                               network->rates[i]);
1059 #endif
1060                                 if (ieee80211_is_ofdm_rate
1061                                     (info_element->data[i])) {
1062                                         network->flags |= NETWORK_HAS_OFDM;
1063                                         if (info_element->data[i] &
1064                                             IEEE80211_BASIC_RATE_MASK)
1065                                                 network->flags &=
1066                                                     ~NETWORK_HAS_CCK;
1067                                 }
1068                         }
1069
1070                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1071                                              rates_str, network->rates_ex_len);
1072                         break;
1073
1074                 case MFIE_TYPE_DS_SET:
1075                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1076                                              info_element->data[0]);
1077                         network->channel = info_element->data[0];
1078                         break;
1079
1080                 case MFIE_TYPE_FH_SET:
1081                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1082                         break;
1083
1084                 case MFIE_TYPE_CF_SET:
1085                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1086                         break;
1087
1088                 case MFIE_TYPE_TIM:
1089                         network->tim.tim_count = info_element->data[0];
1090                         network->tim.tim_period = info_element->data[1];
1091                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1092                         break;
1093
1094                 case MFIE_TYPE_ERP_INFO:
1095                         network->erp_value = info_element->data[0];
1096                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1097                                              network->erp_value);
1098                         break;
1099
1100                 case MFIE_TYPE_IBSS_SET:
1101                         network->atim_window = info_element->data[0];
1102                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1103                                              network->atim_window);
1104                         break;
1105
1106                 case MFIE_TYPE_CHALLENGE:
1107                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1108                         break;
1109
1110                 case MFIE_TYPE_GENERIC:
1111                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1112                                              info_element->len);
1113                         if (!ieee80211_parse_qos_info_param_IE(info_element,
1114                                                                network))
1115                                 break;
1116
1117                         if (info_element->len >= 4 &&
1118                             info_element->data[0] == 0x00 &&
1119                             info_element->data[1] == 0x50 &&
1120                             info_element->data[2] == 0xf2 &&
1121                             info_element->data[3] == 0x01) {
1122                                 network->wpa_ie_len = min(info_element->len + 2,
1123                                                           MAX_WPA_IE_LEN);
1124                                 memcpy(network->wpa_ie, info_element,
1125                                        network->wpa_ie_len);
1126                         }
1127                         break;
1128
1129                 case MFIE_TYPE_RSN:
1130                         IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1131                                              info_element->len);
1132                         network->rsn_ie_len = min(info_element->len + 2,
1133                                                   MAX_WPA_IE_LEN);
1134                         memcpy(network->rsn_ie, info_element,
1135                                network->rsn_ie_len);
1136                         break;
1137
1138                 case MFIE_TYPE_QOS_PARAMETER:
1139                         printk(KERN_ERR
1140                                "QoS Error need to parse QOS_PARAMETER IE\n");
1141                         break;
1142                         /* 802.11h */
1143                 case MFIE_TYPE_POWER_CONSTRAINT:
1144                         network->power_constraint = info_element->data[0];
1145                         network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1146                         break;
1147
1148                 case MFIE_TYPE_CSA:
1149                         network->power_constraint = info_element->data[0];
1150                         network->flags |= NETWORK_HAS_CSA;
1151                         break;
1152
1153                 case MFIE_TYPE_QUIET:
1154                         network->quiet.count = info_element->data[0];
1155                         network->quiet.period = info_element->data[1];
1156                         network->quiet.duration = info_element->data[2];
1157                         network->quiet.offset = info_element->data[3];
1158                         network->flags |= NETWORK_HAS_QUIET;
1159                         break;
1160
1161                 case MFIE_TYPE_IBSS_DFS:
1162                         if (network->ibss_dfs)
1163                                 break;
1164                         network->ibss_dfs =
1165                             kmalloc(info_element->len, GFP_ATOMIC);
1166                         if (!network->ibss_dfs)
1167                                 return 1;
1168                         memcpy(network->ibss_dfs, info_element->data,
1169                                info_element->len);
1170                         network->flags |= NETWORK_HAS_IBSS_DFS;
1171                         break;
1172
1173                 case MFIE_TYPE_TPC_REPORT:
1174                         network->tpc_report.transmit_power =
1175                             info_element->data[0];
1176                         network->tpc_report.link_margin = info_element->data[1];
1177                         network->flags |= NETWORK_HAS_TPC_REPORT;
1178                         break;
1179
1180                 default:
1181                         IEEE80211_DEBUG_MGMT
1182                             ("Unsupported info element: %s (%d)\n",
1183                              get_info_element_string(info_element->id),
1184                              info_element->id);
1185                         break;
1186                 }
1187
1188                 length -= sizeof(*info_element) + info_element->len;
1189                 info_element =
1190                     (struct ieee80211_info_element *)&info_element->
1191                     data[info_element->len];
1192         }
1193
1194         return 0;
1195 }
1196
1197 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1198                                        *frame, struct ieee80211_rx_stats *stats)
1199 {
1200         struct ieee80211_network network_resp = {
1201                 .ibss_dfs = NULL,
1202         };
1203         struct ieee80211_network *network = &network_resp;
1204         struct net_device *dev = ieee->dev;
1205
1206         network->flags = 0;
1207         network->qos_data.active = 0;
1208         network->qos_data.supported = 0;
1209         network->qos_data.param_count = 0;
1210         network->qos_data.old_param_count = 0;
1211
1212         //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1213         network->atim_window = le16_to_cpu(frame->aid);
1214         network->listen_interval = le16_to_cpu(frame->status);
1215         memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1216         network->capability = le16_to_cpu(frame->capability);
1217         network->last_scanned = jiffies;
1218         network->rates_len = network->rates_ex_len = 0;
1219         network->last_associate = 0;
1220         network->ssid_len = 0;
1221         network->erp_value =
1222             (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1223
1224         if (stats->freq == IEEE80211_52GHZ_BAND) {
1225                 /* for A band (No DS info) */
1226                 network->channel = stats->received_channel;
1227         } else
1228                 network->flags |= NETWORK_HAS_CCK;
1229
1230         network->wpa_ie_len = 0;
1231         network->rsn_ie_len = 0;
1232
1233         if (ieee80211_parse_info_param
1234             (frame->info_element, stats->len - sizeof(*frame), network))
1235                 return 1;
1236
1237         network->mode = 0;
1238         if (stats->freq == IEEE80211_52GHZ_BAND)
1239                 network->mode = IEEE_A;
1240         else {
1241                 if (network->flags & NETWORK_HAS_OFDM)
1242                         network->mode |= IEEE_G;
1243                 if (network->flags & NETWORK_HAS_CCK)
1244                         network->mode |= IEEE_B;
1245         }
1246
1247         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1248                 network->flags |= NETWORK_EMPTY_ESSID;
1249
1250         memcpy(&network->stats, stats, sizeof(network->stats));
1251
1252         if (ieee->handle_assoc_response != NULL)
1253                 ieee->handle_assoc_response(dev, frame, network);
1254
1255         return 0;
1256 }
1257
1258 /***************************************************/
1259
1260 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1261                                          *beacon,
1262                                          struct ieee80211_network *network,
1263                                          struct ieee80211_rx_stats *stats)
1264 {
1265         network->qos_data.active = 0;
1266         network->qos_data.supported = 0;
1267         network->qos_data.param_count = 0;
1268         network->qos_data.old_param_count = 0;
1269
1270         /* Pull out fixed field data */
1271         memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1272         network->capability = le16_to_cpu(beacon->capability);
1273         network->last_scanned = jiffies;
1274         network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1275         network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1276         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1277         /* Where to pull this? beacon->listen_interval; */
1278         network->listen_interval = 0x0A;
1279         network->rates_len = network->rates_ex_len = 0;
1280         network->last_associate = 0;
1281         network->ssid_len = 0;
1282         network->flags = 0;
1283         network->atim_window = 0;
1284         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1285             0x3 : 0x0;
1286
1287         if (stats->freq == IEEE80211_52GHZ_BAND) {
1288                 /* for A band (No DS info) */
1289                 network->channel = stats->received_channel;
1290         } else
1291                 network->flags |= NETWORK_HAS_CCK;
1292
1293         network->wpa_ie_len = 0;
1294         network->rsn_ie_len = 0;
1295
1296         if (ieee80211_parse_info_param
1297             (beacon->info_element, stats->len - sizeof(*beacon), network))
1298                 return 1;
1299
1300         network->mode = 0;
1301         if (stats->freq == IEEE80211_52GHZ_BAND)
1302                 network->mode = IEEE_A;
1303         else {
1304                 if (network->flags & NETWORK_HAS_OFDM)
1305                         network->mode |= IEEE_G;
1306                 if (network->flags & NETWORK_HAS_CCK)
1307                         network->mode |= IEEE_B;
1308         }
1309
1310         if (network->mode == 0) {
1311                 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1312                                      "network.\n",
1313                                      escape_essid(network->ssid,
1314                                                   network->ssid_len),
1315                                      MAC_ARG(network->bssid));
1316                 return 1;
1317         }
1318
1319         if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1320                 network->flags |= NETWORK_EMPTY_ESSID;
1321
1322         memcpy(&network->stats, stats, sizeof(network->stats));
1323
1324         return 0;
1325 }
1326
1327 static inline int is_same_network(struct ieee80211_network *src,
1328                                   struct ieee80211_network *dst)
1329 {
1330         /* A network is only a duplicate if the channel, BSSID, and ESSID
1331          * all match.  We treat all <hidden> with the same BSSID and channel
1332          * as one network */
1333         return ((src->ssid_len == dst->ssid_len) &&
1334                 (src->channel == dst->channel) &&
1335                 !compare_ether_addr(src->bssid, dst->bssid) &&
1336                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1337 }
1338
1339 static void update_network(struct ieee80211_network *dst,
1340                                   struct ieee80211_network *src)
1341 {
1342         int qos_active;
1343         u8 old_param;
1344
1345         ieee80211_network_reset(dst);
1346         dst->ibss_dfs = src->ibss_dfs;
1347
1348         memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1349         dst->capability = src->capability;
1350         memcpy(dst->rates, src->rates, src->rates_len);
1351         dst->rates_len = src->rates_len;
1352         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1353         dst->rates_ex_len = src->rates_ex_len;
1354
1355         dst->mode = src->mode;
1356         dst->flags = src->flags;
1357         dst->time_stamp[0] = src->time_stamp[0];
1358         dst->time_stamp[1] = src->time_stamp[1];
1359
1360         dst->beacon_interval = src->beacon_interval;
1361         dst->listen_interval = src->listen_interval;
1362         dst->atim_window = src->atim_window;
1363         dst->erp_value = src->erp_value;
1364         dst->tim = src->tim;
1365
1366         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1367         dst->wpa_ie_len = src->wpa_ie_len;
1368         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1369         dst->rsn_ie_len = src->rsn_ie_len;
1370
1371         dst->last_scanned = jiffies;
1372         qos_active = src->qos_data.active;
1373         old_param = dst->qos_data.old_param_count;
1374         if (dst->flags & NETWORK_HAS_QOS_MASK)
1375                 memcpy(&dst->qos_data, &src->qos_data,
1376                        sizeof(struct ieee80211_qos_data));
1377         else {
1378                 dst->qos_data.supported = src->qos_data.supported;
1379                 dst->qos_data.param_count = src->qos_data.param_count;
1380         }
1381
1382         if (dst->qos_data.supported == 1) {
1383                 if (dst->ssid_len)
1384                         IEEE80211_DEBUG_QOS
1385                             ("QoS the network %s is QoS supported\n",
1386                              dst->ssid);
1387                 else
1388                         IEEE80211_DEBUG_QOS
1389                             ("QoS the network is QoS supported\n");
1390         }
1391         dst->qos_data.active = qos_active;
1392         dst->qos_data.old_param_count = old_param;
1393
1394         /* dst->last_associate is not overwritten */
1395 }
1396
1397 static inline int is_beacon(__le16 fc)
1398 {
1399         return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1400 }
1401
1402 static void ieee80211_process_probe_response(struct ieee80211_device
1403                                                     *ieee, struct
1404                                                     ieee80211_probe_response
1405                                                     *beacon, struct ieee80211_rx_stats
1406                                                     *stats)
1407 {
1408         struct net_device *dev = ieee->dev;
1409         struct ieee80211_network network = {
1410                 .ibss_dfs = NULL,
1411         };
1412         struct ieee80211_network *target;
1413         struct ieee80211_network *oldest = NULL;
1414 #ifdef CONFIG_IEEE80211_DEBUG
1415         struct ieee80211_info_element *info_element = beacon->info_element;
1416 #endif
1417         unsigned long flags;
1418
1419         IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1420                              "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1421                              escape_essid(info_element->data,
1422                                           info_element->len),
1423                              MAC_ARG(beacon->header.addr3),
1424                              (beacon->capability & (1 << 0xf)) ? '1' : '0',
1425                              (beacon->capability & (1 << 0xe)) ? '1' : '0',
1426                              (beacon->capability & (1 << 0xd)) ? '1' : '0',
1427                              (beacon->capability & (1 << 0xc)) ? '1' : '0',
1428                              (beacon->capability & (1 << 0xb)) ? '1' : '0',
1429                              (beacon->capability & (1 << 0xa)) ? '1' : '0',
1430                              (beacon->capability & (1 << 0x9)) ? '1' : '0',
1431                              (beacon->capability & (1 << 0x8)) ? '1' : '0',
1432                              (beacon->capability & (1 << 0x7)) ? '1' : '0',
1433                              (beacon->capability & (1 << 0x6)) ? '1' : '0',
1434                              (beacon->capability & (1 << 0x5)) ? '1' : '0',
1435                              (beacon->capability & (1 << 0x4)) ? '1' : '0',
1436                              (beacon->capability & (1 << 0x3)) ? '1' : '0',
1437                              (beacon->capability & (1 << 0x2)) ? '1' : '0',
1438                              (beacon->capability & (1 << 0x1)) ? '1' : '0',
1439                              (beacon->capability & (1 << 0x0)) ? '1' : '0');
1440
1441         if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1442                 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1443                                      escape_essid(info_element->data,
1444                                                   info_element->len),
1445                                      MAC_ARG(beacon->header.addr3),
1446                                      is_beacon(beacon->header.frame_ctl) ?
1447                                      "BEACON" : "PROBE RESPONSE");
1448                 return;
1449         }
1450
1451         /* The network parsed correctly -- so now we scan our known networks
1452          * to see if we can find it in our list.
1453          *
1454          * NOTE:  This search is definitely not optimized.  Once its doing
1455          *        the "right thing" we'll optimize it for efficiency if
1456          *        necessary */
1457
1458         /* Search for this entry in the list and update it if it is
1459          * already there. */
1460
1461         spin_lock_irqsave(&ieee->lock, flags);
1462
1463         list_for_each_entry(target, &ieee->network_list, list) {
1464                 if (is_same_network(target, &network))
1465                         break;
1466
1467                 if ((oldest == NULL) ||
1468                     (target->last_scanned < oldest->last_scanned))
1469                         oldest = target;
1470         }
1471
1472         /* If we didn't find a match, then get a new network slot to initialize
1473          * with this beacon's information */
1474         if (&target->list == &ieee->network_list) {
1475                 if (list_empty(&ieee->network_free_list)) {
1476                         /* If there are no more slots, expire the oldest */
1477                         list_del(&oldest->list);
1478                         target = oldest;
1479                         IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1480                                              "network list.\n",
1481                                              escape_essid(target->ssid,
1482                                                           target->ssid_len),
1483                                              MAC_ARG(target->bssid));
1484                         ieee80211_network_reset(target);
1485                 } else {
1486                         /* Otherwise just pull from the free list */
1487                         target = list_entry(ieee->network_free_list.next,
1488                                             struct ieee80211_network, list);
1489                         list_del(ieee->network_free_list.next);
1490                 }
1491
1492 #ifdef CONFIG_IEEE80211_DEBUG
1493                 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1494                                      escape_essid(network.ssid,
1495                                                   network.ssid_len),
1496                                      MAC_ARG(network.bssid),
1497                                      is_beacon(beacon->header.frame_ctl) ?
1498                                      "BEACON" : "PROBE RESPONSE");
1499 #endif
1500                 memcpy(target, &network, sizeof(*target));
1501                 network.ibss_dfs = NULL;
1502                 list_add_tail(&target->list, &ieee->network_list);
1503         } else {
1504                 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1505                                      escape_essid(target->ssid,
1506                                                   target->ssid_len),
1507                                      MAC_ARG(target->bssid),
1508                                      is_beacon(beacon->header.frame_ctl) ?
1509                                      "BEACON" : "PROBE RESPONSE");
1510                 update_network(target, &network);
1511                 network.ibss_dfs = NULL;
1512         }
1513
1514         spin_unlock_irqrestore(&ieee->lock, flags);
1515
1516         if (is_beacon(beacon->header.frame_ctl)) {
1517                 if (ieee->handle_beacon != NULL)
1518                         ieee->handle_beacon(dev, beacon, &network);
1519         } else {
1520                 if (ieee->handle_probe_response != NULL)
1521                         ieee->handle_probe_response(dev, beacon, &network);
1522         }
1523 }
1524
1525 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1526                       struct ieee80211_hdr_4addr *header,
1527                       struct ieee80211_rx_stats *stats)
1528 {
1529         switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1530         case IEEE80211_STYPE_ASSOC_RESP:
1531                 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1532                                      WLAN_FC_GET_STYPE(le16_to_cpu
1533                                                        (header->frame_ctl)));
1534                 ieee80211_handle_assoc_resp(ieee,
1535                                             (struct ieee80211_assoc_response *)
1536                                             header, stats);
1537                 break;
1538
1539         case IEEE80211_STYPE_REASSOC_RESP:
1540                 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1541                                      WLAN_FC_GET_STYPE(le16_to_cpu
1542                                                        (header->frame_ctl)));
1543                 break;
1544
1545         case IEEE80211_STYPE_PROBE_REQ:
1546                 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1547                                      WLAN_FC_GET_STYPE(le16_to_cpu
1548                                                        (header->frame_ctl)));
1549
1550                 if (ieee->handle_probe_request != NULL)
1551                         ieee->handle_probe_request(ieee->dev,
1552                                                    (struct
1553                                                     ieee80211_probe_request *)
1554                                                    header, stats);
1555                 break;
1556
1557         case IEEE80211_STYPE_PROBE_RESP:
1558                 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1559                                      WLAN_FC_GET_STYPE(le16_to_cpu
1560                                                        (header->frame_ctl)));
1561                 IEEE80211_DEBUG_SCAN("Probe response\n");
1562                 ieee80211_process_probe_response(ieee,
1563                                                  (struct
1564                                                   ieee80211_probe_response *)
1565                                                  header, stats);
1566                 break;
1567
1568         case IEEE80211_STYPE_BEACON:
1569                 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1570                                      WLAN_FC_GET_STYPE(le16_to_cpu
1571                                                        (header->frame_ctl)));
1572                 IEEE80211_DEBUG_SCAN("Beacon\n");
1573                 ieee80211_process_probe_response(ieee,
1574                                                  (struct
1575                                                   ieee80211_probe_response *)
1576                                                  header, stats);
1577                 break;
1578         case IEEE80211_STYPE_AUTH:
1579
1580                 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1581                                      WLAN_FC_GET_STYPE(le16_to_cpu
1582                                                        (header->frame_ctl)));
1583
1584                 if (ieee->handle_auth != NULL)
1585                         ieee->handle_auth(ieee->dev,
1586                                           (struct ieee80211_auth *)header);
1587                 break;
1588
1589         case IEEE80211_STYPE_DISASSOC:
1590                 if (ieee->handle_disassoc != NULL)
1591                         ieee->handle_disassoc(ieee->dev,
1592                                               (struct ieee80211_disassoc *)
1593                                               header);
1594                 break;
1595
1596         case IEEE80211_STYPE_ACTION:
1597                 IEEE80211_DEBUG_MGMT("ACTION\n");
1598                 if (ieee->handle_action)
1599                         ieee->handle_action(ieee->dev,
1600                                             (struct ieee80211_action *)
1601                                             header, stats);
1602                 break;
1603
1604         case IEEE80211_STYPE_REASSOC_REQ:
1605                 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1606                                      WLAN_FC_GET_STYPE(le16_to_cpu
1607                                                        (header->frame_ctl)));
1608
1609                 IEEE80211_WARNING("%s: IEEE80211_REASSOC_REQ received\n",
1610                                   ieee->dev->name);
1611                 if (ieee->handle_reassoc_request != NULL)
1612                         ieee->handle_reassoc_request(ieee->dev,
1613                                                     (struct ieee80211_reassoc_request *)
1614                                                      header);
1615                 break;
1616
1617         case IEEE80211_STYPE_ASSOC_REQ:
1618                 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1619                                      WLAN_FC_GET_STYPE(le16_to_cpu
1620                                                        (header->frame_ctl)));
1621
1622                 IEEE80211_WARNING("%s: IEEE80211_ASSOC_REQ received\n",
1623                                   ieee->dev->name);
1624                 if (ieee->handle_assoc_request != NULL)
1625                         ieee->handle_assoc_request(ieee->dev);
1626                 break;
1627
1628         case IEEE80211_STYPE_DEAUTH:
1629                 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1630                 if (ieee->handle_deauth != NULL)
1631                         ieee->handle_deauth(ieee->dev,
1632                                             (struct ieee80211_deauth *)
1633                                             header);
1634                 break;
1635         default:
1636                 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1637                                      WLAN_FC_GET_STYPE(le16_to_cpu
1638                                                        (header->frame_ctl)));
1639                 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1640                                   ieee->dev->name,
1641                                   WLAN_FC_GET_STYPE(le16_to_cpu
1642                                                     (header->frame_ctl)));
1643                 break;
1644         }
1645 }
1646
1647 EXPORT_SYMBOL(ieee80211_rx_mgt);
1648 EXPORT_SYMBOL(ieee80211_rx);