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Merge branch 'upstream-fixes'
[linux-2.6/libata-dev.git] / net / ieee80211 / ieee80211_rx.c
blob6b8469da29b15513e15962faa0be62890924c241
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);
Linux 2.6 libata-dev (mirror)