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Linux 2.6.19-rc6
[cris-mirror.git] / net / ieee80211 / ieee80211_rx.c
blob2759312a42043812ee576b108f7505714cbb6018
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/errno.h>
18 #include <linux/if_arp.h>
19 #include <linux/in6.h>
20 #include <linux/in.h>
21 #include <linux/ip.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/netdevice.h>
25 #include <linux/proc_fs.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <linux/tcp.h>
29 #include <linux/types.h>
30 #include <linux/wireless.h>
31 #include <linux/etherdevice.h>
32 #include <asm/uaccess.h>
33 #include <linux/ctype.h>
34
35 #include <net/ieee80211.h>
36
37 static void ieee80211_monitor_rx(struct ieee80211_device *ieee,
38 struct sk_buff *skb,
39 struct ieee80211_rx_stats *rx_stats)
40 {
41 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
42 u16 fc = le16_to_cpu(hdr->frame_ctl);
43
44 skb->dev = ieee->dev;
45 skb->mac.raw = skb->data;
46 skb_pull(skb, ieee80211_get_hdrlen(fc));
47 skb->pkt_type = PACKET_OTHERHOST;
48 skb->protocol = __constant_htons(ETH_P_80211_RAW);
49 memset(skb->cb, 0, sizeof(skb->cb));
50 netif_rx(skb);
51 }
52
53 /* Called only as a tasklet (software IRQ) */
54 static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
55 ieee80211_device
56 *ieee,
57 unsigned int seq,
58 unsigned int frag,
59 u8 * src,
60 u8 * dst)
61 {
62 struct ieee80211_frag_entry *entry;
63 int i;
64
65 for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
66 entry = &ieee->frag_cache[i];
67 if (entry->skb != NULL &&
68 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
69 IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
70 "seq=%u last_frag=%u\n",
71 entry->seq, entry->last_frag);
72 dev_kfree_skb_any(entry->skb);
73 entry->skb = NULL;
74 }
75
76 if (entry->skb != NULL && entry->seq == seq &&
77 (entry->last_frag + 1 == frag || frag == -1) &&
78 !compare_ether_addr(entry->src_addr, src) &&
79 !compare_ether_addr(entry->dst_addr, dst))
80 return entry;
81 }
82
83 return NULL;
84 }
85
86 /* Called only as a tasklet (software IRQ) */
87 static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
88 struct ieee80211_hdr_4addr *hdr)
89 {
90 struct sk_buff *skb = NULL;
91 u16 sc;
92 unsigned int frag, seq;
93 struct ieee80211_frag_entry *entry;
94
95 sc = le16_to_cpu(hdr->seq_ctl);
96 frag = WLAN_GET_SEQ_FRAG(sc);
97 seq = WLAN_GET_SEQ_SEQ(sc);
98
99 if (frag == 0) {
100 /* Reserve enough space to fit maximum frame length */
101 skb = dev_alloc_skb(ieee->dev->mtu +
102 sizeof(struct ieee80211_hdr_4addr) +
103 8 /* LLC */ +
104 2 /* alignment */ +
105 8 /* WEP */ + ETH_ALEN /* WDS */ );
106 if (skb == NULL)
107 return NULL;
108
109 entry = &ieee->frag_cache[ieee->frag_next_idx];
110 ieee->frag_next_idx++;
111 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
112 ieee->frag_next_idx = 0;
113
114 if (entry->skb != NULL)
115 dev_kfree_skb_any(entry->skb);
116
117 entry->first_frag_time = jiffies;
118 entry->seq = seq;
119 entry->last_frag = frag;
120 entry->skb = skb;
121 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
122 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
123 } else {
124 /* received a fragment of a frame for which the head fragment
125 * should have already been received */
126 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
127 hdr->addr1);
128 if (entry != NULL) {
129 entry->last_frag = frag;
130 skb = entry->skb;
131 }
132 }
133
134 return skb;
135 }
136
137 /* Called only as a tasklet (software IRQ) */
138 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
139 struct ieee80211_hdr_4addr *hdr)
140 {
141 u16 sc;
142 unsigned int seq;
143 struct ieee80211_frag_entry *entry;
144
145 sc = le16_to_cpu(hdr->seq_ctl);
146 seq = WLAN_GET_SEQ_SEQ(sc);
147
148 entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
149 hdr->addr1);
150
151 if (entry == NULL) {
152 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
153 "entry (seq=%u)\n", seq);
154 return -1;
155 }
156
157 entry->skb = NULL;
158 return 0;
159 }
160
161 #ifdef NOT_YET
162 /* ieee80211_rx_frame_mgtmt
163 *
164 * Responsible for handling management control frames
165 *
166 * Called by ieee80211_rx */
167 static int
168 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
169 struct ieee80211_rx_stats *rx_stats, u16 type,
170 u16 stype)
171 {
172 if (ieee->iw_mode == IW_MODE_MASTER) {
173 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
174 ieee->dev->name);
175 return 0;
176 /*
177 hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
178 skb->data);*/
179 }
180
181 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
182 if (stype == WLAN_FC_STYPE_BEACON &&
183 ieee->iw_mode == IW_MODE_MASTER) {
184 struct sk_buff *skb2;
185 /* Process beacon frames also in kernel driver to
186 * update STA(AP) table statistics */
187 skb2 = skb_clone(skb, GFP_ATOMIC);
188 if (skb2)
189 hostap_rx(skb2->dev, skb2, rx_stats);
190 }
191
192 /* send management frames to the user space daemon for
193 * processing */
194 ieee->apdevstats.rx_packets++;
195 ieee->apdevstats.rx_bytes += skb->len;
196 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
197 return 0;
198 }
199
200 if (ieee->iw_mode == IW_MODE_MASTER) {
201 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
202 printk(KERN_DEBUG "%s: unknown management frame "
203 "(type=0x%02x, stype=0x%02x) dropped\n",
204 skb->dev->name, type, stype);
205 return -1;
206 }
207
208 hostap_rx(skb->dev, skb, rx_stats);
209 return 0;
210 }
211
212 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
213 "received in non-Host AP mode\n", skb->dev->name);
214 return -1;
215 }
216 #endif
217
218 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
219 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
220 static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
221
222 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
223 static unsigned char bridge_tunnel_header[] =
224 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
225 /* No encapsulation header if EtherType < 0x600 (=length) */
226
227 /* Called by ieee80211_rx_frame_decrypt */
228 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
229 struct sk_buff *skb)
230 {
231 struct net_device *dev = ieee->dev;
232 u16 fc, ethertype;
233 struct ieee80211_hdr_3addr *hdr;
234 u8 *pos;
235
236 if (skb->len < 24)
237 return 0;
238
239 hdr = (struct ieee80211_hdr_3addr *)skb->data;
240 fc = le16_to_cpu(hdr->frame_ctl);
241
242 /* check that the frame is unicast frame to us */
243 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
244 IEEE80211_FCTL_TODS &&
245 !compare_ether_addr(hdr->addr1, dev->dev_addr) &&
246 !compare_ether_addr(hdr->addr3, dev->dev_addr)) {
247 /* ToDS frame with own addr BSSID and DA */
248 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
249 IEEE80211_FCTL_FROMDS &&
250 !compare_ether_addr(hdr->addr1, dev->dev_addr)) {
251 /* FromDS frame with own addr as DA */
252 } else
253 return 0;
254
255 if (skb->len < 24 + 8)
256 return 0;
257
258 /* check for port access entity Ethernet type */
259 pos = skb->data + 24;
260 ethertype = (pos[6] << 8) | pos[7];
261 if (ethertype == ETH_P_PAE)
262 return 1;
263
264 return 0;
265 }
266
267 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
268 static int
269 ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
270 struct ieee80211_crypt_data *crypt)
271 {
272 struct ieee80211_hdr_3addr *hdr;
273 int res, hdrlen;
274
275 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
276 return 0;
277
278 hdr = (struct ieee80211_hdr_3addr *)skb->data;
279 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
280
281 atomic_inc(&crypt->refcnt);
282 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
283 atomic_dec(&crypt->refcnt);
284 if (res < 0) {
285 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
286 ") res=%d\n", MAC_ARG(hdr->addr2), res);
287 if (res == -2)
288 IEEE80211_DEBUG_DROP("Decryption failed ICV "
289 "mismatch (key %d)\n",
290 skb->data[hdrlen + 3] >> 6);
291 ieee->ieee_stats.rx_discards_undecryptable++;
292 return -1;
293 }
294
295 return res;
296 }
297
298 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
299 static int
300 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
301 struct sk_buff *skb, int keyidx,
302 struct ieee80211_crypt_data *crypt)
303 {
304 struct ieee80211_hdr_3addr *hdr;
305 int res, hdrlen;
306
307 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
308 return 0;
309
310 hdr = (struct ieee80211_hdr_3addr *)skb->data;
311 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
312
313 atomic_inc(&crypt->refcnt);
314 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
315 atomic_dec(&crypt->refcnt);
316 if (res < 0) {
317 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
318 " (SA=" MAC_FMT " keyidx=%d)\n",
319 ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
320 return -1;
321 }
322
323 return 0;
324 }
325
326 /* All received frames are sent to this function. @skb contains the frame in
327 * IEEE 802.11 format, i.e., in the format it was sent over air.
328 * This function is called only as a tasklet (software IRQ). */
329 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
330 struct ieee80211_rx_stats *rx_stats)
331 {
332 struct net_device *dev = ieee->dev;
333 struct ieee80211_hdr_4addr *hdr;
334 size_t hdrlen;
335 u16 fc, type, stype, sc;
336 struct net_device_stats *stats;
337 unsigned int frag;
338 u8 *payload;
339 u16 ethertype;
340 #ifdef NOT_YET
341 struct net_device *wds = NULL;
342 struct sk_buff *skb2 = NULL;
343 struct net_device *wds = NULL;
344 int frame_authorized = 0;
345 int from_assoc_ap = 0;
346 void *sta = NULL;
347 #endif
348 u8 dst[ETH_ALEN];
349 u8 src[ETH_ALEN];
350 struct ieee80211_crypt_data *crypt = NULL;
351 int keyidx = 0;
352 int can_be_decrypted = 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 CONFIG_WIRELESS_EXT
372 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
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 /* IW_WIRELESS_SPY */
400 #endif /* CONFIG_WIRELESS_EXT */
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 stats->rx_packets++;
408 stats->rx_bytes += skb->len;
409 ieee80211_monitor_rx(ieee, skb, rx_stats);
410 return 1;
411 }
412
413 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
414 is_broadcast_ether_addr(hdr->addr2)) ?
415 ieee->host_mc_decrypt : ieee->host_decrypt;
416
417 if (can_be_decrypted) {
418 int idx = 0;
419 if (skb->len >= hdrlen + 3) {
420 /* Top two-bits of byte 3 are the key index */
421 idx = skb->data[hdrlen + 3] >> 6;
422 }
423
424 /* ieee->crypt[] is WEP_KEY (4) in length. Given that idx
425 * is only allowed 2-bits of storage, no value of idx can
426 * be provided via above code that would result in idx
427 * being out of range */
428 crypt = ieee->crypt[idx];
429
430 #ifdef NOT_YET
431 sta = NULL;
432
433 /* Use station specific key to override default keys if the
434 * receiver address is a unicast address ("individual RA"). If
435 * bcrx_sta_key parameter is set, station specific key is used
436 * even with broad/multicast targets (this is against IEEE
437 * 802.11, but makes it easier to use different keys with
438 * stations that do not support WEP key mapping). */
439
440 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
441 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
442 &sta);
443 #endif
444
445 /* allow NULL decrypt to indicate an station specific override
446 * for default encryption */
447 if (crypt && (crypt->ops == NULL ||
448 crypt->ops->decrypt_mpdu == NULL))
449 crypt = NULL;
450
451 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
452 /* This seems to be triggered by some (multicast?)
453 * frames from other than current BSS, so just drop the
454 * frames silently instead of filling system log with
455 * these reports. */
456 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
457 " (SA=" MAC_FMT ")\n",
458 MAC_ARG(hdr->addr2));
459 ieee->ieee_stats.rx_discards_undecryptable++;
460 goto rx_dropped;
461 }
462 }
463 #ifdef NOT_YET
464 if (type != WLAN_FC_TYPE_DATA) {
465 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
466 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
467 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
468 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
469 "from " MAC_FMT "\n", dev->name,
470 MAC_ARG(hdr->addr2));
471 /* TODO: could inform hostapd about this so that it
472 * could send auth failure report */
473 goto rx_dropped;
474 }
475
476 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
477 goto rx_dropped;
478 else
479 goto rx_exit;
480 }
481 #endif
482
483 /* Data frame - extract src/dst addresses */
484 if (skb->len < IEEE80211_3ADDR_LEN)
485 goto rx_dropped;
486
487 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
488 case IEEE80211_FCTL_FROMDS:
489 memcpy(dst, hdr->addr1, ETH_ALEN);
490 memcpy(src, hdr->addr3, ETH_ALEN);
491 break;
492 case IEEE80211_FCTL_TODS:
493 memcpy(dst, hdr->addr3, ETH_ALEN);
494 memcpy(src, hdr->addr2, ETH_ALEN);
495 break;
496 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
497 if (skb->len < IEEE80211_4ADDR_LEN)
498 goto rx_dropped;
499 memcpy(dst, hdr->addr3, ETH_ALEN);
500 memcpy(src, hdr->addr4, ETH_ALEN);
501 break;
502 case 0:
503 memcpy(dst, hdr->addr1, ETH_ALEN);
504 memcpy(src, hdr->addr2, ETH_ALEN);
505 break;
506 }
507
508 #ifdef NOT_YET
509 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
510 goto rx_dropped;
511 if (wds) {
512 skb->dev = dev = wds;
513 stats = hostap_get_stats(dev);
514 }
515
516 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
517 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
518 IEEE80211_FCTL_FROMDS && ieee->stadev
519 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
520 /* Frame from BSSID of the AP for which we are a client */
521 skb->dev = dev = ieee->stadev;
522 stats = hostap_get_stats(dev);
523 from_assoc_ap = 1;
524 }
525 #endif
526
527 dev->last_rx = jiffies;
528
529 #ifdef NOT_YET
530 if ((ieee->iw_mode == IW_MODE_MASTER ||
531 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
532 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
533 wds != NULL)) {
534 case AP_RX_CONTINUE_NOT_AUTHORIZED:
535 frame_authorized = 0;
536 break;
537 case AP_RX_CONTINUE:
538 frame_authorized = 1;
539 break;
540 case AP_RX_DROP:
541 goto rx_dropped;
542 case AP_RX_EXIT:
543 goto rx_exit;
544 }
545 }
546 #endif
547
548 /* Nullfunc frames may have PS-bit set, so they must be passed to
549 * hostap_handle_sta_rx() before being dropped here. */
550
551 stype &= ~IEEE80211_STYPE_QOS_DATA;
552
553 if (stype != IEEE80211_STYPE_DATA &&
554 stype != IEEE80211_STYPE_DATA_CFACK &&
555 stype != IEEE80211_STYPE_DATA_CFPOLL &&
556 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
557 if (stype != IEEE80211_STYPE_NULLFUNC)
558 IEEE80211_DEBUG_DROP("RX: dropped data frame "
559 "with no data (type=0x%02x, "
560 "subtype=0x%02x, len=%d)\n",
561 type, stype, skb->len);
562 goto rx_dropped;
563 }
564
565 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
566
567 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
568 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
569 goto rx_dropped;
570
571 hdr = (struct ieee80211_hdr_4addr *)skb->data;
572
573 /* skb: hdr + (possibly fragmented) plaintext payload */
574 // PR: FIXME: hostap has additional conditions in the "if" below:
575 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
576 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
577 int flen;
578 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
579 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
580
581 if (!frag_skb) {
582 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
583 "Rx cannot get skb from fragment "
584 "cache (morefrag=%d seq=%u frag=%u)\n",
585 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
586 WLAN_GET_SEQ_SEQ(sc), frag);
587 goto rx_dropped;
588 }
589
590 flen = skb->len;
591 if (frag != 0)
592 flen -= hdrlen;
593
594 if (frag_skb->tail + flen > frag_skb->end) {
595 printk(KERN_WARNING "%s: host decrypted and "
596 "reassembled frame did not fit skb\n",
597 dev->name);
598 ieee80211_frag_cache_invalidate(ieee, hdr);
599 goto rx_dropped;
600 }
601
602 if (frag == 0) {
603 /* copy first fragment (including full headers) into
604 * beginning of the fragment cache skb */
605 memcpy(skb_put(frag_skb, flen), skb->data, flen);
606 } else {
607 /* append frame payload to the end of the fragment
608 * cache skb */
609 memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
610 flen);
611 }
612 dev_kfree_skb_any(skb);
613 skb = NULL;
614
615 if (fc & IEEE80211_FCTL_MOREFRAGS) {
616 /* more fragments expected - leave the skb in fragment
617 * cache for now; it will be delivered to upper layers
618 * after all fragments have been received */
619 goto rx_exit;
620 }
621
622 /* this was the last fragment and the frame will be
623 * delivered, so remove skb from fragment cache */
624 skb = frag_skb;
625 hdr = (struct ieee80211_hdr_4addr *)skb->data;
626 ieee80211_frag_cache_invalidate(ieee, hdr);
627 }
628
629 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
630 * encrypted/authenticated */
631 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
632 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
633 goto rx_dropped;
634
635 hdr = (struct ieee80211_hdr_4addr *)skb->data;
636 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
637 if ( /*ieee->ieee802_1x && */
638 ieee80211_is_eapol_frame(ieee, skb)) {
639 /* pass unencrypted EAPOL frames even if encryption is
640 * configured */
641 } else {
642 IEEE80211_DEBUG_DROP("encryption configured, but RX "
643 "frame not encrypted (SA=" MAC_FMT
644 ")\n", MAC_ARG(hdr->addr2));
645 goto rx_dropped;
646 }
647 }
648
649 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
650 !ieee80211_is_eapol_frame(ieee, skb)) {
651 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
652 "frame from " MAC_FMT
653 " (drop_unencrypted=1)\n",
654 MAC_ARG(hdr->addr2));
655 goto rx_dropped;
656 }
657
658 /* skb: hdr + (possible reassembled) full plaintext payload */
659
660 payload = skb->data + hdrlen;
661 ethertype = (payload[6] << 8) | payload[7];
662
663 #ifdef NOT_YET
664 /* If IEEE 802.1X is used, check whether the port is authorized to send
665 * the received frame. */
666 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
667 if (ethertype == ETH_P_PAE) {
668 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
669 dev->name);
670 if (ieee->hostapd && ieee->apdev) {
671 /* Send IEEE 802.1X frames to the user
672 * space daemon for processing */
673 prism2_rx_80211(ieee->apdev, skb, rx_stats,
674 PRISM2_RX_MGMT);
675 ieee->apdevstats.rx_packets++;
676 ieee->apdevstats.rx_bytes += skb->len;
677 goto rx_exit;
678 }
679 } else if (!frame_authorized) {
680 printk(KERN_DEBUG "%s: dropped frame from "
681 "unauthorized port (IEEE 802.1X): "
682 "ethertype=0x%04x\n", dev->name, ethertype);
683 goto rx_dropped;
684 }
685 }
686 #endif
687
688 /* convert hdr + possible LLC headers into Ethernet header */
689 if (skb->len - hdrlen >= 8 &&
690 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
691 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
692 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
693 /* remove RFC1042 or Bridge-Tunnel encapsulation and
694 * replace EtherType */
695 skb_pull(skb, hdrlen + SNAP_SIZE);
696 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
697 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
698 } else {
699 u16 len;
700 /* Leave Ethernet header part of hdr and full payload */
701 skb_pull(skb, hdrlen);
702 len = htons(skb->len);
703 memcpy(skb_push(skb, 2), &len, 2);
704 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
705 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
706 }
707
708 #ifdef NOT_YET
709 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
710 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
711 /* Non-standard frame: get addr4 from its bogus location after
712 * the payload */
713 memcpy(skb->data + ETH_ALEN,
714 skb->data + skb->len - ETH_ALEN, ETH_ALEN);
715 skb_trim(skb, skb->len - ETH_ALEN);
716 }
717 #endif
718
719 stats->rx_packets++;
720 stats->rx_bytes += skb->len;
721
722 #ifdef NOT_YET
723 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
724 if (dst[0] & 0x01) {
725 /* copy multicast frame both to the higher layers and
726 * to the wireless media */
727 ieee->ap->bridged_multicast++;
728 skb2 = skb_clone(skb, GFP_ATOMIC);
729 if (skb2 == NULL)
730 printk(KERN_DEBUG "%s: skb_clone failed for "
731 "multicast frame\n", dev->name);
732 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
733 /* send frame directly to the associated STA using
734 * wireless media and not passing to higher layers */
735 ieee->ap->bridged_unicast++;
736 skb2 = skb;
737 skb = NULL;
738 }
739 }
740
741 if (skb2 != NULL) {
742 /* send to wireless media */
743 skb2->protocol = __constant_htons(ETH_P_802_3);
744 skb2->mac.raw = skb2->nh.raw = skb2->data;
745 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
746 skb2->dev = dev;
747 dev_queue_xmit(skb2);
748 }
749 #endif
750
751 if (skb) {
752 skb->protocol = eth_type_trans(skb, dev);
753 memset(skb->cb, 0, sizeof(skb->cb));
754 skb->dev = dev;
755 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
756 if (netif_rx(skb) == NET_RX_DROP) {
757 /* netif_rx always succeeds, but it might drop
758 * the packet. If it drops the packet, we log that
759 * in our stats. */
760 IEEE80211_DEBUG_DROP
761 ("RX: netif_rx dropped the packet\n");
762 stats->rx_dropped++;
763 }
764 }
765
766 rx_exit:
767 #ifdef NOT_YET
768 if (sta)
769 hostap_handle_sta_release(sta);
770 #endif
771 return 1;
772
773 rx_dropped:
774 stats->rx_dropped++;
775
776 /* Returning 0 indicates to caller that we have not handled the SKB--
777 * so it is still allocated and can be used again by underlying
778 * hardware as a DMA target */
779 return 0;
780 }
781
782 /* Filter out unrelated packets, call ieee80211_rx[_mgt]
783 * This function takes over the skb, it should not be used again after calling
784 * this function. */
785 void ieee80211_rx_any(struct ieee80211_device *ieee,
786 struct sk_buff *skb, struct ieee80211_rx_stats *stats)
787 {
788 struct ieee80211_hdr_4addr *hdr;
789 int is_packet_for_us;
790 u16 fc;
791
792 if (ieee->iw_mode == IW_MODE_MONITOR) {
793 if (!ieee80211_rx(ieee, skb, stats))
794 dev_kfree_skb_irq(skb);
795 return;
796 }
797
798 if (skb->len < sizeof(struct ieee80211_hdr))
799 goto drop_free;
800
801 hdr = (struct ieee80211_hdr_4addr *)skb->data;
802 fc = le16_to_cpu(hdr->frame_ctl);
803
804 if ((fc & IEEE80211_FCTL_VERS) != 0)
805 goto drop_free;
806
807 switch (fc & IEEE80211_FCTL_FTYPE) {
808 case IEEE80211_FTYPE_MGMT:
809 if (skb->len < sizeof(struct ieee80211_hdr_3addr))
810 goto drop_free;
811 ieee80211_rx_mgt(ieee, hdr, stats);
812 dev_kfree_skb_irq(skb);
813 return;
814 case IEEE80211_FTYPE_DATA:
815 break;
816 case IEEE80211_FTYPE_CTL:
817 return;
818 default:
819 return;
820 }
821
822 is_packet_for_us = 0;
823 switch (ieee->iw_mode) {
824 case IW_MODE_ADHOC:
825 /* our BSS and not from/to DS */
826 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
827 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
828 /* promisc: get all */
829 if (ieee->dev->flags & IFF_PROMISC)
830 is_packet_for_us = 1;
831 /* to us */
832 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
833 is_packet_for_us = 1;
834 /* mcast */
835 else if (is_multicast_ether_addr(hdr->addr1))
836 is_packet_for_us = 1;
837 }
838 break;
839 case IW_MODE_INFRA:
840 /* our BSS (== from our AP) and from DS */
841 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
842 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
843 /* promisc: get all */
844 if (ieee->dev->flags & IFF_PROMISC)
845 is_packet_for_us = 1;
846 /* to us */
847 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
848 is_packet_for_us = 1;
849 /* mcast */
850 else if (is_multicast_ether_addr(hdr->addr1)) {
851 /* not our own packet bcasted from AP */
852 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
853 is_packet_for_us = 1;
854 }
855 }
856 break;
857 default:
858 /* ? */
859 break;
860 }
861
862 if (is_packet_for_us)
863 if (!ieee80211_rx(ieee, skb, stats))
864 dev_kfree_skb_irq(skb);
865 return;
866
867 drop_free:
868 dev_kfree_skb_irq(skb);
869 ieee->stats.rx_dropped++;
870 return;
871 }
872
873 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
874
875 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
876
877 /*
878 * Make ther structure we read from the beacon packet has
879 * the right values
880 */
881 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
882 *info_element, int sub_type)
883 {
884
885 if (info_element->qui_subtype != sub_type)
886 return -1;
887 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
888 return -1;
889 if (info_element->qui_type != QOS_OUI_TYPE)
890 return -1;
891 if (info_element->version != QOS_VERSION_1)
892 return -1;
893
894 return 0;
895 }
896
897 /*
898 * Parse a QoS parameter element
899 */
900 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
901 *element_param, struct ieee80211_info_element
902 *info_element)
903 {
904 int ret = 0;
905 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
906
907 if ((info_element == NULL) || (element_param == NULL))
908 return -1;
909
910 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
911 memcpy(element_param->info_element.qui, info_element->data,
912 info_element->len);
913 element_param->info_element.elementID = info_element->id;
914 element_param->info_element.length = info_element->len;
915 } else
916 ret = -1;
917 if (ret == 0)
918 ret = ieee80211_verify_qos_info(&element_param->info_element,
919 QOS_OUI_PARAM_SUB_TYPE);
920 return ret;
921 }
922
923 /*
924 * Parse a QoS information element
925 */
926 static int ieee80211_read_qos_info_element(struct
927 ieee80211_qos_information_element
928 *element_info, struct ieee80211_info_element
929 *info_element)
930 {
931 int ret = 0;
932 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
933
934 if (element_info == NULL)
935 return -1;
936 if (info_element == NULL)
937 return -1;
938
939 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
940 memcpy(element_info->qui, info_element->data,
941 info_element->len);
942 element_info->elementID = info_element->id;
943 element_info->length = info_element->len;
944 } else
945 ret = -1;
946
947 if (ret == 0)
948 ret = ieee80211_verify_qos_info(element_info,
949 QOS_OUI_INFO_SUB_TYPE);
950 return ret;
951 }
952
953 /*
954 * Write QoS parameters from the ac parameters.
955 */
956 static int ieee80211_qos_convert_ac_to_parameters(struct
957 ieee80211_qos_parameter_info
958 *param_elm, struct
959 ieee80211_qos_parameters
960 *qos_param)
961 {
962 int rc = 0;
963 int i;
964 struct ieee80211_qos_ac_parameter *ac_params;
965 u32 txop;
966 u8 cw_min;
967 u8 cw_max;
968
969 for (i = 0; i < QOS_QUEUE_NUM; i++) {
970 ac_params = &(param_elm->ac_params_record[i]);
971
972 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
973 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
974
975 cw_min = ac_params->ecw_min_max & 0x0F;
976 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
977
978 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
979 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
980
981 qos_param->flag[i] =
982 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
983
984 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
985 qos_param->tx_op_limit[i] = (u16) txop;
986 }
987 return rc;
988 }
989
990 /*
991 * we have a generic data element which it may contain QoS information or
992 * parameters element. check the information element length to decide
993 * which type to read
994 */
995 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
996 *info_element,
997 struct ieee80211_network *network)
998 {
999 int rc = 0;
1000 struct ieee80211_qos_parameters *qos_param = NULL;
1001 struct ieee80211_qos_information_element qos_info_element;
1002
1003 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
1004
1005 if (rc == 0) {
1006 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1007 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1008 } else {
1009 struct ieee80211_qos_parameter_info param_element;
1010
1011 rc = ieee80211_read_qos_param_element(&param_element,
1012 info_element);
1013 if (rc == 0) {
1014 qos_param = &(network->qos_data.parameters);
1015 ieee80211_qos_convert_ac_to_parameters(&param_element,
1016 qos_param);
1017 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1018 network->qos_data.param_count =
1019 param_element.info_element.ac_info & 0x0F;
1020 }
1021 }
1022
1023 if (rc == 0) {
1024 IEEE80211_DEBUG_QOS("QoS is supported\n");
1025 network->qos_data.supported = 1;
1026 }
1027 return rc;
1028 }
1029
1030 #ifdef CONFIG_IEEE80211_DEBUG
1031 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1032
1033 static const char *get_info_element_string(u16 id)
1034 {
1035 switch (id) {
1036 MFIE_STRING(SSID);
1037 MFIE_STRING(RATES);
1038 MFIE_STRING(FH_SET);
1039 MFIE_STRING(DS_SET);
1040 MFIE_STRING(CF_SET);
1041 MFIE_STRING(TIM);
1042 MFIE_STRING(IBSS_SET);
1043 MFIE_STRING(COUNTRY);
1044 MFIE_STRING(HOP_PARAMS);
1045 MFIE_STRING(HOP_TABLE);
1046 MFIE_STRING(REQUEST);
1047 MFIE_STRING(CHALLENGE);
1048 MFIE_STRING(POWER_CONSTRAINT);
1049 MFIE_STRING(POWER_CAPABILITY);
1050 MFIE_STRING(TPC_REQUEST);
1051 MFIE_STRING(TPC_REPORT);
1052 MFIE_STRING(SUPP_CHANNELS);
1053 MFIE_STRING(CSA);
1054 MFIE_STRING(MEASURE_REQUEST);
1055 MFIE_STRING(MEASURE_REPORT);
1056 MFIE_STRING(QUIET);
1057 MFIE_STRING(IBSS_DFS);
1058 MFIE_STRING(ERP_INFO);
1059 MFIE_STRING(RSN);
1060 MFIE_STRING(RATES_EX);
1061 MFIE_STRING(GENERIC);
1062 MFIE_STRING(QOS_PARAMETER);
1063 default:
1064 return "UNKNOWN";
1065 }
1066 }
1067 #endif
1068
1069 static int ieee80211_parse_info_param(struct ieee80211_info_element
1070 *info_element, u16 length,
1071 struct ieee80211_network *network)
1072 {
1073 u8 i;
1074 #ifdef CONFIG_IEEE80211_DEBUG
1075 char rates_str[64];
1076 char *p;
1077 #endif
1078
1079 while (length >= sizeof(*info_element)) {
1080 if (sizeof(*info_element) + info_element->len > length) {
1081 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
1082 "info_element->len + 2 > left : "
1083 "info_element->len+2=%zd left=%d, id=%d.\n",
1084 info_element->len +
1085 sizeof(*info_element),
1086 length, info_element->id);
1087 /* We stop processing but don't return an error here
1088 * because some misbehaviour APs break this rule. ie.
1089 * Orinoco AP1000. */
1090 break;
1091 }
1092
1093 switch (info_element->id) {
1094 case MFIE_TYPE_SSID:
1095 if (ieee80211_is_empty_essid(info_element->data,
1096 info_element->len)) {
1097 network->flags |= NETWORK_EMPTY_ESSID;
1098 break;
1099 }
1100
1101 network->ssid_len = min(info_element->len,
1102 (u8) IW_ESSID_MAX_SIZE);
1103 memcpy(network->ssid, info_element->data,
1104 network->ssid_len);
1105 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1106 memset(network->ssid + network->ssid_len, 0,
1107 IW_ESSID_MAX_SIZE - network->ssid_len);
1108
1109 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1110 network->ssid, network->ssid_len);
1111 break;
1112
1113 case MFIE_TYPE_RATES:
1114 #ifdef CONFIG_IEEE80211_DEBUG
1115 p = rates_str;
1116 #endif
1117 network->rates_len = min(info_element->len,
1118 MAX_RATES_LENGTH);
1119 for (i = 0; i < network->rates_len; i++) {
1120 network->rates[i] = info_element->data[i];
1121 #ifdef CONFIG_IEEE80211_DEBUG
1122 p += snprintf(p, sizeof(rates_str) -
1123 (p - rates_str), "%02X ",
1124 network->rates[i]);
1125 #endif
1126 if (ieee80211_is_ofdm_rate
1127 (info_element->data[i])) {
1128 network->flags |= NETWORK_HAS_OFDM;
1129 if (info_element->data[i] &
1130 IEEE80211_BASIC_RATE_MASK)
1131 network->flags &=
1132 ~NETWORK_HAS_CCK;
1133 }
1134 }
1135
1136 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1137 rates_str, network->rates_len);
1138 break;
1139
1140 case MFIE_TYPE_RATES_EX:
1141 #ifdef CONFIG_IEEE80211_DEBUG
1142 p = rates_str;
1143 #endif
1144 network->rates_ex_len = min(info_element->len,
1145 MAX_RATES_EX_LENGTH);
1146 for (i = 0; i < network->rates_ex_len; i++) {
1147 network->rates_ex[i] = info_element->data[i];
1148 #ifdef CONFIG_IEEE80211_DEBUG
1149 p += snprintf(p, sizeof(rates_str) -
1150 (p - rates_str), "%02X ",
1151 network->rates[i]);
1152 #endif
1153 if (ieee80211_is_ofdm_rate
1154 (info_element->data[i])) {
1155 network->flags |= NETWORK_HAS_OFDM;
1156 if (info_element->data[i] &
1157 IEEE80211_BASIC_RATE_MASK)
1158 network->flags &=
1159 ~NETWORK_HAS_CCK;
1160 }
1161 }
1162
1163 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1164 rates_str, network->rates_ex_len);
1165 break;
1166
1167 case MFIE_TYPE_DS_SET:
1168 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1169 info_element->data[0]);
1170 network->channel = info_element->data[0];
1171 break;
1172
1173 case MFIE_TYPE_FH_SET:
1174 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1175 break;
1176
1177 case MFIE_TYPE_CF_SET:
1178 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1179 break;
1180
1181 case MFIE_TYPE_TIM:
1182 network->tim.tim_count = info_element->data[0];
1183 network->tim.tim_period = info_element->data[1];
1184 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1185 break;
1186
1187 case MFIE_TYPE_ERP_INFO:
1188 network->erp_value = info_element->data[0];
1189 network->flags |= NETWORK_HAS_ERP_VALUE;
1190 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1191 network->erp_value);
1192 break;
1193
1194 case MFIE_TYPE_IBSS_SET:
1195 network->atim_window = info_element->data[0];
1196 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1197 network->atim_window);
1198 break;
1199
1200 case MFIE_TYPE_CHALLENGE:
1201 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1202 break;
1203
1204 case MFIE_TYPE_GENERIC:
1205 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1206 info_element->len);
1207 if (!ieee80211_parse_qos_info_param_IE(info_element,
1208 network))
1209 break;
1210
1211 if (info_element->len >= 4 &&
1212 info_element->data[0] == 0x00 &&
1213 info_element->data[1] == 0x50 &&
1214 info_element->data[2] == 0xf2 &&
1215 info_element->data[3] == 0x01) {
1216 network->wpa_ie_len = min(info_element->len + 2,
1217 MAX_WPA_IE_LEN);
1218 memcpy(network->wpa_ie, info_element,
1219 network->wpa_ie_len);
1220 }
1221 break;
1222
1223 case MFIE_TYPE_RSN:
1224 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1225 info_element->len);
1226 network->rsn_ie_len = min(info_element->len + 2,
1227 MAX_WPA_IE_LEN);
1228 memcpy(network->rsn_ie, info_element,
1229 network->rsn_ie_len);
1230 break;
1231
1232 case MFIE_TYPE_QOS_PARAMETER:
1233 printk(KERN_ERR
1234 "QoS Error need to parse QOS_PARAMETER IE\n");
1235 break;
1236 /* 802.11h */
1237 case MFIE_TYPE_POWER_CONSTRAINT:
1238 network->power_constraint = info_element->data[0];
1239 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1240 break;
1241
1242 case MFIE_TYPE_CSA:
1243 network->power_constraint = info_element->data[0];
1244 network->flags |= NETWORK_HAS_CSA;
1245 break;
1246
1247 case MFIE_TYPE_QUIET:
1248 network->quiet.count = info_element->data[0];
1249 network->quiet.period = info_element->data[1];
1250 network->quiet.duration = info_element->data[2];
1251 network->quiet.offset = info_element->data[3];
1252 network->flags |= NETWORK_HAS_QUIET;
1253 break;
1254
1255 case MFIE_TYPE_IBSS_DFS:
1256 if (network->ibss_dfs)
1257 break;
1258 network->ibss_dfs =
1259 kmalloc(info_element->len, GFP_ATOMIC);
1260 if (!network->ibss_dfs)
1261 return 1;
1262 memcpy(network->ibss_dfs, info_element->data,
1263 info_element->len);
1264 network->flags |= NETWORK_HAS_IBSS_DFS;
1265 break;
1266
1267 case MFIE_TYPE_TPC_REPORT:
1268 network->tpc_report.transmit_power =
1269 info_element->data[0];
1270 network->tpc_report.link_margin = info_element->data[1];
1271 network->flags |= NETWORK_HAS_TPC_REPORT;
1272 break;
1273
1274 default:
1275 IEEE80211_DEBUG_MGMT
1276 ("Unsupported info element: %s (%d)\n",
1277 get_info_element_string(info_element->id),
1278 info_element->id);
1279 break;
1280 }
1281
1282 length -= sizeof(*info_element) + info_element->len;
1283 info_element =
1284 (struct ieee80211_info_element *)&info_element->
1285 data[info_element->len];
1286 }
1287
1288 return 0;
1289 }
1290
1291 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1292 *frame, struct ieee80211_rx_stats *stats)
1293 {
1294 struct ieee80211_network network_resp = {
1295 .ibss_dfs = NULL,
1296 };
1297 struct ieee80211_network *network = &network_resp;
1298 struct net_device *dev = ieee->dev;
1299
1300 network->flags = 0;
1301 network->qos_data.active = 0;
1302 network->qos_data.supported = 0;
1303 network->qos_data.param_count = 0;
1304 network->qos_data.old_param_count = 0;
1305
1306 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1307 network->atim_window = le16_to_cpu(frame->aid);
1308 network->listen_interval = le16_to_cpu(frame->status);
1309 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1310 network->capability = le16_to_cpu(frame->capability);
1311 network->last_scanned = jiffies;
1312 network->rates_len = network->rates_ex_len = 0;
1313 network->last_associate = 0;
1314 network->ssid_len = 0;
1315 network->erp_value =
1316 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1317
1318 if (stats->freq == IEEE80211_52GHZ_BAND) {
1319 /* for A band (No DS info) */
1320 network->channel = stats->received_channel;
1321 } else
1322 network->flags |= NETWORK_HAS_CCK;
1323
1324 network->wpa_ie_len = 0;
1325 network->rsn_ie_len = 0;
1326
1327 if (ieee80211_parse_info_param
1328 (frame->info_element, stats->len - sizeof(*frame), network))
1329 return 1;
1330
1331 network->mode = 0;
1332 if (stats->freq == IEEE80211_52GHZ_BAND)
1333 network->mode = IEEE_A;
1334 else {
1335 if (network->flags & NETWORK_HAS_OFDM)
1336 network->mode |= IEEE_G;
1337 if (network->flags & NETWORK_HAS_CCK)
1338 network->mode |= IEEE_B;
1339 }
1340
1341 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1342 network->flags |= NETWORK_EMPTY_ESSID;
1343
1344 memcpy(&network->stats, stats, sizeof(network->stats));
1345
1346 if (ieee->handle_assoc_response != NULL)
1347 ieee->handle_assoc_response(dev, frame, network);
1348
1349 return 0;
1350 }
1351
1352 /***************************************************/
1353
1354 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1355 *beacon,
1356 struct ieee80211_network *network,
1357 struct ieee80211_rx_stats *stats)
1358 {
1359 network->qos_data.active = 0;
1360 network->qos_data.supported = 0;
1361 network->qos_data.param_count = 0;
1362 network->qos_data.old_param_count = 0;
1363
1364 /* Pull out fixed field data */
1365 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1366 network->capability = le16_to_cpu(beacon->capability);
1367 network->last_scanned = jiffies;
1368 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1369 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1370 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1371 /* Where to pull this? beacon->listen_interval; */
1372 network->listen_interval = 0x0A;
1373 network->rates_len = network->rates_ex_len = 0;
1374 network->last_associate = 0;
1375 network->ssid_len = 0;
1376 network->flags = 0;
1377 network->atim_window = 0;
1378 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1379 0x3 : 0x0;
1380
1381 if (stats->freq == IEEE80211_52GHZ_BAND) {
1382 /* for A band (No DS info) */
1383 network->channel = stats->received_channel;
1384 } else
1385 network->flags |= NETWORK_HAS_CCK;
1386
1387 network->wpa_ie_len = 0;
1388 network->rsn_ie_len = 0;
1389
1390 if (ieee80211_parse_info_param
1391 (beacon->info_element, stats->len - sizeof(*beacon), network))
1392 return 1;
1393
1394 network->mode = 0;
1395 if (stats->freq == IEEE80211_52GHZ_BAND)
1396 network->mode = IEEE_A;
1397 else {
1398 if (network->flags & NETWORK_HAS_OFDM)
1399 network->mode |= IEEE_G;
1400 if (network->flags & NETWORK_HAS_CCK)
1401 network->mode |= IEEE_B;
1402 }
1403
1404 if (network->mode == 0) {
1405 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1406 "network.\n",
1407 escape_essid(network->ssid,
1408 network->ssid_len),
1409 MAC_ARG(network->bssid));
1410 return 1;
1411 }
1412
1413 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1414 network->flags |= NETWORK_EMPTY_ESSID;
1415
1416 memcpy(&network->stats, stats, sizeof(network->stats));
1417
1418 return 0;
1419 }
1420
1421 static inline int is_same_network(struct ieee80211_network *src,
1422 struct ieee80211_network *dst)
1423 {
1424 /* A network is only a duplicate if the channel, BSSID, and ESSID
1425 * all match. We treat all <hidden> with the same BSSID and channel
1426 * as one network */
1427 return ((src->ssid_len == dst->ssid_len) &&
1428 (src->channel == dst->channel) &&
1429 !compare_ether_addr(src->bssid, dst->bssid) &&
1430 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1431 }
1432
1433 static void update_network(struct ieee80211_network *dst,
1434 struct ieee80211_network *src)
1435 {
1436 int qos_active;
1437 u8 old_param;
1438
1439 ieee80211_network_reset(dst);
1440 dst->ibss_dfs = src->ibss_dfs;
1441
1442 /* We only update the statistics if they were created by receiving
1443 * the network information on the actual channel the network is on.
1444 *
1445 * This keeps beacons received on neighbor channels from bringing
1446 * down the signal level of an AP. */
1447 if (dst->channel == src->stats.received_channel)
1448 memcpy(&dst->stats, &src->stats,
1449 sizeof(struct ieee80211_rx_stats));
1450 else
1451 IEEE80211_DEBUG_SCAN("Network " MAC_FMT " info received "
1452 "off channel (%d vs. %d)\n", MAC_ARG(src->bssid),
1453 dst->channel, src->stats.received_channel);
1454
1455 dst->capability = src->capability;
1456 memcpy(dst->rates, src->rates, src->rates_len);
1457 dst->rates_len = src->rates_len;
1458 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1459 dst->rates_ex_len = src->rates_ex_len;
1460
1461 dst->mode = src->mode;
1462 dst->flags = src->flags;
1463 dst->time_stamp[0] = src->time_stamp[0];
1464 dst->time_stamp[1] = src->time_stamp[1];
1465
1466 dst->beacon_interval = src->beacon_interval;
1467 dst->listen_interval = src->listen_interval;
1468 dst->atim_window = src->atim_window;
1469 dst->erp_value = src->erp_value;
1470 dst->tim = src->tim;
1471
1472 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1473 dst->wpa_ie_len = src->wpa_ie_len;
1474 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1475 dst->rsn_ie_len = src->rsn_ie_len;
1476
1477 dst->last_scanned = jiffies;
1478 qos_active = src->qos_data.active;
1479 old_param = dst->qos_data.old_param_count;
1480 if (dst->flags & NETWORK_HAS_QOS_MASK)
1481 memcpy(&dst->qos_data, &src->qos_data,
1482 sizeof(struct ieee80211_qos_data));
1483 else {
1484 dst->qos_data.supported = src->qos_data.supported;
1485 dst->qos_data.param_count = src->qos_data.param_count;
1486 }
1487
1488 if (dst->qos_data.supported == 1) {
1489 if (dst->ssid_len)
1490 IEEE80211_DEBUG_QOS
1491 ("QoS the network %s is QoS supported\n",
1492 dst->ssid);
1493 else
1494 IEEE80211_DEBUG_QOS
1495 ("QoS the network is QoS supported\n");
1496 }
1497 dst->qos_data.active = qos_active;
1498 dst->qos_data.old_param_count = old_param;
1499
1500 /* dst->last_associate is not overwritten */
1501 }
1502
1503 static inline int is_beacon(__le16 fc)
1504 {
1505 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1506 }
1507
1508 static void ieee80211_process_probe_response(struct ieee80211_device
1509 *ieee, struct
1510 ieee80211_probe_response
1511 *beacon, struct ieee80211_rx_stats
1512 *stats)
1513 {
1514 struct net_device *dev = ieee->dev;
1515 struct ieee80211_network network = {
1516 .ibss_dfs = NULL,
1517 };
1518 struct ieee80211_network *target;
1519 struct ieee80211_network *oldest = NULL;
1520 #ifdef CONFIG_IEEE80211_DEBUG
1521 struct ieee80211_info_element *info_element = beacon->info_element;
1522 #endif
1523 unsigned long flags;
1524
1525 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1526 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1527 escape_essid(info_element->data,
1528 info_element->len),
1529 MAC_ARG(beacon->header.addr3),
1530 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1531 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1532 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1533 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1534 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1535 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1536 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1537 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1538 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1539 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1540 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1541 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1542 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1543 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1544 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1545 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1546
1547 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1548 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1549 escape_essid(info_element->data,
1550 info_element->len),
1551 MAC_ARG(beacon->header.addr3),
1552 is_beacon(beacon->header.frame_ctl) ?
1553 "BEACON" : "PROBE RESPONSE");
1554 return;
1555 }
1556
1557 /* The network parsed correctly -- so now we scan our known networks
1558 * to see if we can find it in our list.
1559 *
1560 * NOTE: This search is definitely not optimized. Once its doing
1561 * the "right thing" we'll optimize it for efficiency if
1562 * necessary */
1563
1564 /* Search for this entry in the list and update it if it is
1565 * already there. */
1566
1567 spin_lock_irqsave(&ieee->lock, flags);
1568
1569 list_for_each_entry(target, &ieee->network_list, list) {
1570 if (is_same_network(target, &network))
1571 break;
1572
1573 if ((oldest == NULL) ||
1574 (target->last_scanned < oldest->last_scanned))
1575 oldest = target;
1576 }
1577
1578 /* If we didn't find a match, then get a new network slot to initialize
1579 * with this beacon's information */
1580 if (&target->list == &ieee->network_list) {
1581 if (list_empty(&ieee->network_free_list)) {
1582 /* If there are no more slots, expire the oldest */
1583 list_del(&oldest->list);
1584 target = oldest;
1585 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1586 "network list.\n",
1587 escape_essid(target->ssid,
1588 target->ssid_len),
1589 MAC_ARG(target->bssid));
1590 ieee80211_network_reset(target);
1591 } else {
1592 /* Otherwise just pull from the free list */
1593 target = list_entry(ieee->network_free_list.next,
1594 struct ieee80211_network, list);
1595 list_del(ieee->network_free_list.next);
1596 }
1597
1598 #ifdef CONFIG_IEEE80211_DEBUG
1599 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1600 escape_essid(network.ssid,
1601 network.ssid_len),
1602 MAC_ARG(network.bssid),
1603 is_beacon(beacon->header.frame_ctl) ?
1604 "BEACON" : "PROBE RESPONSE");
1605 #endif
1606 memcpy(target, &network, sizeof(*target));
1607 network.ibss_dfs = NULL;
1608 list_add_tail(&target->list, &ieee->network_list);
1609 } else {
1610 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1611 escape_essid(target->ssid,
1612 target->ssid_len),
1613 MAC_ARG(target->bssid),
1614 is_beacon(beacon->header.frame_ctl) ?
1615 "BEACON" : "PROBE RESPONSE");
1616 update_network(target, &network);
1617 network.ibss_dfs = NULL;
1618 }
1619
1620 spin_unlock_irqrestore(&ieee->lock, flags);
1621
1622 if (is_beacon(beacon->header.frame_ctl)) {
1623 if (ieee->handle_beacon != NULL)
1624 ieee->handle_beacon(dev, beacon, target);
1625 } else {
1626 if (ieee->handle_probe_response != NULL)
1627 ieee->handle_probe_response(dev, beacon, target);
1628 }
1629 }
1630
1631 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1632 struct ieee80211_hdr_4addr *header,
1633 struct ieee80211_rx_stats *stats)
1634 {
1635 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1636 case IEEE80211_STYPE_ASSOC_RESP:
1637 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1638 WLAN_FC_GET_STYPE(le16_to_cpu
1639 (header->frame_ctl)));
1640 ieee80211_handle_assoc_resp(ieee,
1641 (struct ieee80211_assoc_response *)
1642 header, stats);
1643 break;
1644
1645 case IEEE80211_STYPE_REASSOC_RESP:
1646 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1647 WLAN_FC_GET_STYPE(le16_to_cpu
1648 (header->frame_ctl)));
1649 break;
1650
1651 case IEEE80211_STYPE_PROBE_REQ:
1652 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1653 WLAN_FC_GET_STYPE(le16_to_cpu
1654 (header->frame_ctl)));
1655
1656 if (ieee->handle_probe_request != NULL)
1657 ieee->handle_probe_request(ieee->dev,
1658 (struct
1659 ieee80211_probe_request *)
1660 header, stats);
1661 break;
1662
1663 case IEEE80211_STYPE_PROBE_RESP:
1664 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1665 WLAN_FC_GET_STYPE(le16_to_cpu
1666 (header->frame_ctl)));
1667 IEEE80211_DEBUG_SCAN("Probe response\n");
1668 ieee80211_process_probe_response(ieee,
1669 (struct
1670 ieee80211_probe_response *)
1671 header, stats);
1672 break;
1673
1674 case IEEE80211_STYPE_BEACON:
1675 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1676 WLAN_FC_GET_STYPE(le16_to_cpu
1677 (header->frame_ctl)));
1678 IEEE80211_DEBUG_SCAN("Beacon\n");
1679 ieee80211_process_probe_response(ieee,
1680 (struct
1681 ieee80211_probe_response *)
1682 header, stats);
1683 break;
1684 case IEEE80211_STYPE_AUTH:
1685
1686 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1687 WLAN_FC_GET_STYPE(le16_to_cpu
1688 (header->frame_ctl)));
1689
1690 if (ieee->handle_auth != NULL)
1691 ieee->handle_auth(ieee->dev,
1692 (struct ieee80211_auth *)header);
1693 break;
1694
1695 case IEEE80211_STYPE_DISASSOC:
1696 if (ieee->handle_disassoc != NULL)
1697 ieee->handle_disassoc(ieee->dev,
1698 (struct ieee80211_disassoc *)
1699 header);
1700 break;
1701
1702 case IEEE80211_STYPE_ACTION:
1703 IEEE80211_DEBUG_MGMT("ACTION\n");
1704 if (ieee->handle_action)
1705 ieee->handle_action(ieee->dev,
1706 (struct ieee80211_action *)
1707 header, stats);
1708 break;
1709
1710 case IEEE80211_STYPE_REASSOC_REQ:
1711 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1712 WLAN_FC_GET_STYPE(le16_to_cpu
1713 (header->frame_ctl)));
1714
1715 IEEE80211_DEBUG_MGMT("%s: IEEE80211_REASSOC_REQ received\n",
1716 ieee->dev->name);
1717 if (ieee->handle_reassoc_request != NULL)
1718 ieee->handle_reassoc_request(ieee->dev,
1719 (struct ieee80211_reassoc_request *)
1720 header);
1721 break;
1722
1723 case IEEE80211_STYPE_ASSOC_REQ:
1724 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1725 WLAN_FC_GET_STYPE(le16_to_cpu
1726 (header->frame_ctl)));
1727
1728 IEEE80211_DEBUG_MGMT("%s: IEEE80211_ASSOC_REQ received\n",
1729 ieee->dev->name);
1730 if (ieee->handle_assoc_request != NULL)
1731 ieee->handle_assoc_request(ieee->dev);
1732 break;
1733
1734 case IEEE80211_STYPE_DEAUTH:
1735 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1736 if (ieee->handle_deauth != NULL)
1737 ieee->handle_deauth(ieee->dev,
1738 (struct ieee80211_deauth *)
1739 header);
1740 break;
1741 default:
1742 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1743 WLAN_FC_GET_STYPE(le16_to_cpu
1744 (header->frame_ctl)));
1745 IEEE80211_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1746 ieee->dev->name,
1747 WLAN_FC_GET_STYPE(le16_to_cpu
1748 (header->frame_ctl)));
1749 break;
1750 }
1751 }
1752
1753 EXPORT_SYMBOL_GPL(ieee80211_rx_any);
1754 EXPORT_SYMBOL(ieee80211_rx_mgt);
1755 EXPORT_SYMBOL(ieee80211_rx);
CRIS linux kernel tree