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net/: Kill now superfluous ->last_rx stores.
[linux-2.6/mini2440.git] / net / ieee80211 / ieee80211_rx.c
blob3dd58b594f6ab5533605919a94420f9aef7d4d38
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 * <j@w1.fi>
7 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.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/lib80211.h>
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_control);
44
45 skb->dev = ieee->dev;
46 skb_reset_mac_header(skb);
47 skb_pull(skb, ieee80211_get_hdrlen(fc));
48 skb->pkt_type = PACKET_OTHERHOST;
49 skb->protocol = 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=%pM) res=%d\n",
287 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=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2,
320 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 if (skb->len < hdrlen) {
371 printk(KERN_INFO "%s: invalid SKB length %d\n",
372 dev->name, skb->len);
373 goto rx_dropped;
374 }
375
376 /* Put this code here so that we avoid duplicating it in all
377 * Rx paths. - Jean II */
378 #ifdef CONFIG_WIRELESS_EXT
379 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
380 /* If spy monitoring on */
381 if (ieee->spy_data.spy_number > 0) {
382 struct iw_quality wstats;
383
384 wstats.updated = 0;
385 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
386 wstats.level = rx_stats->signal;
387 wstats.updated |= IW_QUAL_LEVEL_UPDATED;
388 } else
389 wstats.updated |= IW_QUAL_LEVEL_INVALID;
390
391 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
392 wstats.noise = rx_stats->noise;
393 wstats.updated |= IW_QUAL_NOISE_UPDATED;
394 } else
395 wstats.updated |= IW_QUAL_NOISE_INVALID;
396
397 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
398 wstats.qual = rx_stats->signal;
399 wstats.updated |= IW_QUAL_QUAL_UPDATED;
400 } else
401 wstats.updated |= IW_QUAL_QUAL_INVALID;
402
403 /* Update spy records */
404 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
405 }
406 #endif /* IW_WIRELESS_SPY */
407 #endif /* CONFIG_WIRELESS_EXT */
408
409 #ifdef NOT_YET
410 hostap_update_rx_stats(local->ap, hdr, rx_stats);
411 #endif
412
413 if (ieee->iw_mode == IW_MODE_MONITOR) {
414 stats->rx_packets++;
415 stats->rx_bytes += skb->len;
416 ieee80211_monitor_rx(ieee, skb, rx_stats);
417 return 1;
418 }
419
420 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
421 is_broadcast_ether_addr(hdr->addr2)) ?
422 ieee->host_mc_decrypt : ieee->host_decrypt;
423
424 if (can_be_decrypted) {
425 if (skb->len >= hdrlen + 3) {
426 /* Top two-bits of byte 3 are the key index */
427 keyidx = skb->data[hdrlen + 3] >> 6;
428 }
429
430 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx
431 * is only allowed 2-bits of storage, no value of keyidx can
432 * be provided via above code that would result in keyidx
433 * being out of range */
434 crypt = ieee->crypt[keyidx];
435
436 #ifdef NOT_YET
437 sta = NULL;
438
439 /* Use station specific key to override default keys if the
440 * receiver address is a unicast address ("individual RA"). If
441 * bcrx_sta_key parameter is set, station specific key is used
442 * even with broad/multicast targets (this is against IEEE
443 * 802.11, but makes it easier to use different keys with
444 * stations that do not support WEP key mapping). */
445
446 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
447 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
448 &sta);
449 #endif
450
451 /* allow NULL decrypt to indicate an station specific override
452 * for default encryption */
453 if (crypt && (crypt->ops == NULL ||
454 crypt->ops->decrypt_mpdu == NULL))
455 crypt = NULL;
456
457 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
458 /* This seems to be triggered by some (multicast?)
459 * frames from other than current BSS, so just drop the
460 * frames silently instead of filling system log with
461 * these reports. */
462 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
463 " (SA=%pM)\n", hdr->addr2);
464 ieee->ieee_stats.rx_discards_undecryptable++;
465 goto rx_dropped;
466 }
467 }
468 #ifdef NOT_YET
469 if (type != WLAN_FC_TYPE_DATA) {
470 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
471 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
472 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
473 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
474 "from %pM\n", dev->name, hdr->addr2);
475 /* TODO: could inform hostapd about this so that it
476 * could send auth failure report */
477 goto rx_dropped;
478 }
479
480 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
481 goto rx_dropped;
482 else
483 goto rx_exit;
484 }
485 #endif
486 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
487 if (sc == ieee->prev_seq_ctl)
488 goto rx_dropped;
489 else
490 ieee->prev_seq_ctl = sc;
491
492 /* Data frame - extract src/dst addresses */
493 if (skb->len < IEEE80211_3ADDR_LEN)
494 goto rx_dropped;
495
496 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
497 case IEEE80211_FCTL_FROMDS:
498 memcpy(dst, hdr->addr1, ETH_ALEN);
499 memcpy(src, hdr->addr3, ETH_ALEN);
500 break;
501 case IEEE80211_FCTL_TODS:
502 memcpy(dst, hdr->addr3, ETH_ALEN);
503 memcpy(src, hdr->addr2, ETH_ALEN);
504 break;
505 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
506 if (skb->len < IEEE80211_4ADDR_LEN)
507 goto rx_dropped;
508 memcpy(dst, hdr->addr3, ETH_ALEN);
509 memcpy(src, hdr->addr4, ETH_ALEN);
510 break;
511 case 0:
512 memcpy(dst, hdr->addr1, ETH_ALEN);
513 memcpy(src, hdr->addr2, ETH_ALEN);
514 break;
515 }
516
517 #ifdef NOT_YET
518 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
519 goto rx_dropped;
520 if (wds) {
521 skb->dev = dev = wds;
522 stats = hostap_get_stats(dev);
523 }
524
525 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
526 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
527 IEEE80211_FCTL_FROMDS && ieee->stadev
528 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
529 /* Frame from BSSID of the AP for which we are a client */
530 skb->dev = dev = ieee->stadev;
531 stats = hostap_get_stats(dev);
532 from_assoc_ap = 1;
533 }
534 #endif
535
536 #ifdef NOT_YET
537 if ((ieee->iw_mode == IW_MODE_MASTER ||
538 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
539 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
540 wds != NULL)) {
541 case AP_RX_CONTINUE_NOT_AUTHORIZED:
542 frame_authorized = 0;
543 break;
544 case AP_RX_CONTINUE:
545 frame_authorized = 1;
546 break;
547 case AP_RX_DROP:
548 goto rx_dropped;
549 case AP_RX_EXIT:
550 goto rx_exit;
551 }
552 }
553 #endif
554
555 /* Nullfunc frames may have PS-bit set, so they must be passed to
556 * hostap_handle_sta_rx() before being dropped here. */
557
558 stype &= ~IEEE80211_STYPE_QOS_DATA;
559
560 if (stype != IEEE80211_STYPE_DATA &&
561 stype != IEEE80211_STYPE_DATA_CFACK &&
562 stype != IEEE80211_STYPE_DATA_CFPOLL &&
563 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
564 if (stype != IEEE80211_STYPE_NULLFUNC)
565 IEEE80211_DEBUG_DROP("RX: dropped data frame "
566 "with no data (type=0x%02x, "
567 "subtype=0x%02x, len=%d)\n",
568 type, stype, skb->len);
569 goto rx_dropped;
570 }
571
572 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
573
574 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
575 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
576 goto rx_dropped;
577
578 hdr = (struct ieee80211_hdr_4addr *)skb->data;
579
580 /* skb: hdr + (possibly fragmented) plaintext payload */
581 // PR: FIXME: hostap has additional conditions in the "if" below:
582 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
583 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
584 int flen;
585 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
586 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
587
588 if (!frag_skb) {
589 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
590 "Rx cannot get skb from fragment "
591 "cache (morefrag=%d seq=%u frag=%u)\n",
592 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
593 WLAN_GET_SEQ_SEQ(sc), frag);
594 goto rx_dropped;
595 }
596
597 flen = skb->len;
598 if (frag != 0)
599 flen -= hdrlen;
600
601 if (frag_skb->tail + flen > frag_skb->end) {
602 printk(KERN_WARNING "%s: host decrypted and "
603 "reassembled frame did not fit skb\n",
604 dev->name);
605 ieee80211_frag_cache_invalidate(ieee, hdr);
606 goto rx_dropped;
607 }
608
609 if (frag == 0) {
610 /* copy first fragment (including full headers) into
611 * beginning of the fragment cache skb */
612 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);
613 } else {
614 /* append frame payload to the end of the fragment
615 * cache skb */
616 skb_copy_from_linear_data_offset(skb, hdrlen,
617 skb_put(frag_skb, flen), flen);
618 }
619 dev_kfree_skb_any(skb);
620 skb = NULL;
621
622 if (fc & IEEE80211_FCTL_MOREFRAGS) {
623 /* more fragments expected - leave the skb in fragment
624 * cache for now; it will be delivered to upper layers
625 * after all fragments have been received */
626 goto rx_exit;
627 }
628
629 /* this was the last fragment and the frame will be
630 * delivered, so remove skb from fragment cache */
631 skb = frag_skb;
632 hdr = (struct ieee80211_hdr_4addr *)skb->data;
633 ieee80211_frag_cache_invalidate(ieee, hdr);
634 }
635
636 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
637 * encrypted/authenticated */
638 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
639 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
640 goto rx_dropped;
641
642 hdr = (struct ieee80211_hdr_4addr *)skb->data;
643 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
644 if ( /*ieee->ieee802_1x && */
645 ieee80211_is_eapol_frame(ieee, skb)) {
646 /* pass unencrypted EAPOL frames even if encryption is
647 * configured */
648 } else {
649 IEEE80211_DEBUG_DROP("encryption configured, but RX "
650 "frame not encrypted (SA=%pM)\n",
651 hdr->addr2);
652 goto rx_dropped;
653 }
654 }
655
656 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
657 !ieee80211_is_eapol_frame(ieee, skb)) {
658 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
659 "frame from %pM (drop_unencrypted=1)\n",
660 hdr->addr2);
661 goto rx_dropped;
662 }
663
664 /* If the frame was decrypted in hardware, we may need to strip off
665 * any security data (IV, ICV, etc) that was left behind */
666 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&
667 ieee->host_strip_iv_icv) {
668 int trimlen = 0;
669
670 /* Top two-bits of byte 3 are the key index */
671 if (skb->len >= hdrlen + 3)
672 keyidx = skb->data[hdrlen + 3] >> 6;
673
674 /* To strip off any security data which appears before the
675 * payload, we simply increase hdrlen (as the header gets
676 * chopped off immediately below). For the security data which
677 * appears after the payload, we use skb_trim. */
678
679 switch (ieee->sec.encode_alg[keyidx]) {
680 case SEC_ALG_WEP:
681 /* 4 byte IV */
682 hdrlen += 4;
683 /* 4 byte ICV */
684 trimlen = 4;
685 break;
686 case SEC_ALG_TKIP:
687 /* 4 byte IV, 4 byte ExtIV */
688 hdrlen += 8;
689 /* 8 byte MIC, 4 byte ICV */
690 trimlen = 12;
691 break;
692 case SEC_ALG_CCMP:
693 /* 8 byte CCMP header */
694 hdrlen += 8;
695 /* 8 byte MIC */
696 trimlen = 8;
697 break;
698 }
699
700 if (skb->len < trimlen)
701 goto rx_dropped;
702
703 __skb_trim(skb, skb->len - trimlen);
704
705 if (skb->len < hdrlen)
706 goto rx_dropped;
707 }
708
709 /* skb: hdr + (possible reassembled) full plaintext payload */
710
711 payload = skb->data + hdrlen;
712 ethertype = (payload[6] << 8) | payload[7];
713
714 #ifdef NOT_YET
715 /* If IEEE 802.1X is used, check whether the port is authorized to send
716 * the received frame. */
717 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
718 if (ethertype == ETH_P_PAE) {
719 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
720 dev->name);
721 if (ieee->hostapd && ieee->apdev) {
722 /* Send IEEE 802.1X frames to the user
723 * space daemon for processing */
724 prism2_rx_80211(ieee->apdev, skb, rx_stats,
725 PRISM2_RX_MGMT);
726 ieee->apdevstats.rx_packets++;
727 ieee->apdevstats.rx_bytes += skb->len;
728 goto rx_exit;
729 }
730 } else if (!frame_authorized) {
731 printk(KERN_DEBUG "%s: dropped frame from "
732 "unauthorized port (IEEE 802.1X): "
733 "ethertype=0x%04x\n", dev->name, ethertype);
734 goto rx_dropped;
735 }
736 }
737 #endif
738
739 /* convert hdr + possible LLC headers into Ethernet header */
740 if (skb->len - hdrlen >= 8 &&
741 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
742 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
743 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
744 /* remove RFC1042 or Bridge-Tunnel encapsulation and
745 * replace EtherType */
746 skb_pull(skb, hdrlen + SNAP_SIZE);
747 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
748 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
749 } else {
750 __be16 len;
751 /* Leave Ethernet header part of hdr and full payload */
752 skb_pull(skb, hdrlen);
753 len = htons(skb->len);
754 memcpy(skb_push(skb, 2), &len, 2);
755 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
756 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
757 }
758
759 #ifdef NOT_YET
760 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
761 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
762 /* Non-standard frame: get addr4 from its bogus location after
763 * the payload */
764 skb_copy_to_linear_data_offset(skb, ETH_ALEN,
765 skb->data + skb->len - ETH_ALEN,
766 ETH_ALEN);
767 skb_trim(skb, skb->len - ETH_ALEN);
768 }
769 #endif
770
771 stats->rx_packets++;
772 stats->rx_bytes += skb->len;
773
774 #ifdef NOT_YET
775 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
776 if (dst[0] & 0x01) {
777 /* copy multicast frame both to the higher layers and
778 * to the wireless media */
779 ieee->ap->bridged_multicast++;
780 skb2 = skb_clone(skb, GFP_ATOMIC);
781 if (skb2 == NULL)
782 printk(KERN_DEBUG "%s: skb_clone failed for "
783 "multicast frame\n", dev->name);
784 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
785 /* send frame directly to the associated STA using
786 * wireless media and not passing to higher layers */
787 ieee->ap->bridged_unicast++;
788 skb2 = skb;
789 skb = NULL;
790 }
791 }
792
793 if (skb2 != NULL) {
794 /* send to wireless media */
795 skb2->dev = dev;
796 skb2->protocol = htons(ETH_P_802_3);
797 skb_reset_mac_header(skb2);
798 skb_reset_network_header(skb2);
799 /* skb2->network_header += ETH_HLEN; */
800 dev_queue_xmit(skb2);
801 }
802 #endif
803
804 if (skb) {
805 skb->protocol = eth_type_trans(skb, dev);
806 memset(skb->cb, 0, sizeof(skb->cb));
807 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
808 if (netif_rx(skb) == NET_RX_DROP) {
809 /* netif_rx always succeeds, but it might drop
810 * the packet. If it drops the packet, we log that
811 * in our stats. */
812 IEEE80211_DEBUG_DROP
813 ("RX: netif_rx dropped the packet\n");
814 stats->rx_dropped++;
815 }
816 }
817
818 rx_exit:
819 #ifdef NOT_YET
820 if (sta)
821 hostap_handle_sta_release(sta);
822 #endif
823 return 1;
824
825 rx_dropped:
826 stats->rx_dropped++;
827
828 /* Returning 0 indicates to caller that we have not handled the SKB--
829 * so it is still allocated and can be used again by underlying
830 * hardware as a DMA target */
831 return 0;
832 }
833
834 /* Filter out unrelated packets, call ieee80211_rx[_mgt]
835 * This function takes over the skb, it should not be used again after calling
836 * this function. */
837 void ieee80211_rx_any(struct ieee80211_device *ieee,
838 struct sk_buff *skb, struct ieee80211_rx_stats *stats)
839 {
840 struct ieee80211_hdr_4addr *hdr;
841 int is_packet_for_us;
842 u16 fc;
843
844 if (ieee->iw_mode == IW_MODE_MONITOR) {
845 if (!ieee80211_rx(ieee, skb, stats))
846 dev_kfree_skb_irq(skb);
847 return;
848 }
849
850 if (skb->len < sizeof(struct ieee80211_hdr))
851 goto drop_free;
852
853 hdr = (struct ieee80211_hdr_4addr *)skb->data;
854 fc = le16_to_cpu(hdr->frame_ctl);
855
856 if ((fc & IEEE80211_FCTL_VERS) != 0)
857 goto drop_free;
858
859 switch (fc & IEEE80211_FCTL_FTYPE) {
860 case IEEE80211_FTYPE_MGMT:
861 if (skb->len < sizeof(struct ieee80211_hdr_3addr))
862 goto drop_free;
863 ieee80211_rx_mgt(ieee, hdr, stats);
864 dev_kfree_skb_irq(skb);
865 return;
866 case IEEE80211_FTYPE_DATA:
867 break;
868 case IEEE80211_FTYPE_CTL:
869 return;
870 default:
871 return;
872 }
873
874 is_packet_for_us = 0;
875 switch (ieee->iw_mode) {
876 case IW_MODE_ADHOC:
877 /* our BSS and not from/to DS */
878 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
879 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
880 /* promisc: get all */
881 if (ieee->dev->flags & IFF_PROMISC)
882 is_packet_for_us = 1;
883 /* to us */
884 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
885 is_packet_for_us = 1;
886 /* mcast */
887 else if (is_multicast_ether_addr(hdr->addr1))
888 is_packet_for_us = 1;
889 }
890 break;
891 case IW_MODE_INFRA:
892 /* our BSS (== from our AP) and from DS */
893 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
894 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
895 /* promisc: get all */
896 if (ieee->dev->flags & IFF_PROMISC)
897 is_packet_for_us = 1;
898 /* to us */
899 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
900 is_packet_for_us = 1;
901 /* mcast */
902 else if (is_multicast_ether_addr(hdr->addr1)) {
903 /* not our own packet bcasted from AP */
904 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
905 is_packet_for_us = 1;
906 }
907 }
908 break;
909 default:
910 /* ? */
911 break;
912 }
913
914 if (is_packet_for_us)
915 if (!ieee80211_rx(ieee, skb, stats))
916 dev_kfree_skb_irq(skb);
917 return;
918
919 drop_free:
920 dev_kfree_skb_irq(skb);
921 ieee->stats.rx_dropped++;
922 return;
923 }
924
925 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
926
927 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
928
929 /*
930 * Make ther structure we read from the beacon packet has
931 * the right values
932 */
933 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
934 *info_element, int sub_type)
935 {
936
937 if (info_element->qui_subtype != sub_type)
938 return -1;
939 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
940 return -1;
941 if (info_element->qui_type != QOS_OUI_TYPE)
942 return -1;
943 if (info_element->version != QOS_VERSION_1)
944 return -1;
945
946 return 0;
947 }
948
949 /*
950 * Parse a QoS parameter element
951 */
952 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
953 *element_param, struct ieee80211_info_element
954 *info_element)
955 {
956 int ret = 0;
957 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
958
959 if ((info_element == NULL) || (element_param == NULL))
960 return -1;
961
962 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
963 memcpy(element_param->info_element.qui, info_element->data,
964 info_element->len);
965 element_param->info_element.elementID = info_element->id;
966 element_param->info_element.length = info_element->len;
967 } else
968 ret = -1;
969 if (ret == 0)
970 ret = ieee80211_verify_qos_info(&element_param->info_element,
971 QOS_OUI_PARAM_SUB_TYPE);
972 return ret;
973 }
974
975 /*
976 * Parse a QoS information element
977 */
978 static int ieee80211_read_qos_info_element(struct
979 ieee80211_qos_information_element
980 *element_info, struct ieee80211_info_element
981 *info_element)
982 {
983 int ret = 0;
984 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
985
986 if (element_info == NULL)
987 return -1;
988 if (info_element == NULL)
989 return -1;
990
991 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
992 memcpy(element_info->qui, info_element->data,
993 info_element->len);
994 element_info->elementID = info_element->id;
995 element_info->length = info_element->len;
996 } else
997 ret = -1;
998
999 if (ret == 0)
1000 ret = ieee80211_verify_qos_info(element_info,
1001 QOS_OUI_INFO_SUB_TYPE);
1002 return ret;
1003 }
1004
1005 /*
1006 * Write QoS parameters from the ac parameters.
1007 */
1008 static int ieee80211_qos_convert_ac_to_parameters(struct
1009 ieee80211_qos_parameter_info
1010 *param_elm, struct
1011 ieee80211_qos_parameters
1012 *qos_param)
1013 {
1014 int rc = 0;
1015 int i;
1016 struct ieee80211_qos_ac_parameter *ac_params;
1017 u32 txop;
1018 u8 cw_min;
1019 u8 cw_max;
1020
1021 for (i = 0; i < QOS_QUEUE_NUM; i++) {
1022 ac_params = &(param_elm->ac_params_record[i]);
1023
1024 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
1025 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
1026
1027 cw_min = ac_params->ecw_min_max & 0x0F;
1028 qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1);
1029
1030 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
1031 qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1);
1032
1033 qos_param->flag[i] =
1034 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1035
1036 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
1037 qos_param->tx_op_limit[i] = cpu_to_le16(txop);
1038 }
1039 return rc;
1040 }
1041
1042 /*
1043 * we have a generic data element which it may contain QoS information or
1044 * parameters element. check the information element length to decide
1045 * which type to read
1046 */
1047 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
1048 *info_element,
1049 struct ieee80211_network *network)
1050 {
1051 int rc = 0;
1052 struct ieee80211_qos_parameters *qos_param = NULL;
1053 struct ieee80211_qos_information_element qos_info_element;
1054
1055 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
1056
1057 if (rc == 0) {
1058 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1059 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1060 } else {
1061 struct ieee80211_qos_parameter_info param_element;
1062
1063 rc = ieee80211_read_qos_param_element(&param_element,
1064 info_element);
1065 if (rc == 0) {
1066 qos_param = &(network->qos_data.parameters);
1067 ieee80211_qos_convert_ac_to_parameters(&param_element,
1068 qos_param);
1069 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1070 network->qos_data.param_count =
1071 param_element.info_element.ac_info & 0x0F;
1072 }
1073 }
1074
1075 if (rc == 0) {
1076 IEEE80211_DEBUG_QOS("QoS is supported\n");
1077 network->qos_data.supported = 1;
1078 }
1079 return rc;
1080 }
1081
1082 #ifdef CONFIG_IEEE80211_DEBUG
1083 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1084
1085 static const char *get_info_element_string(u16 id)
1086 {
1087 switch (id) {
1088 MFIE_STRING(SSID);
1089 MFIE_STRING(RATES);
1090 MFIE_STRING(FH_SET);
1091 MFIE_STRING(DS_SET);
1092 MFIE_STRING(CF_SET);
1093 MFIE_STRING(TIM);
1094 MFIE_STRING(IBSS_SET);
1095 MFIE_STRING(COUNTRY);
1096 MFIE_STRING(HOP_PARAMS);
1097 MFIE_STRING(HOP_TABLE);
1098 MFIE_STRING(REQUEST);
1099 MFIE_STRING(CHALLENGE);
1100 MFIE_STRING(POWER_CONSTRAINT);
1101 MFIE_STRING(POWER_CAPABILITY);
1102 MFIE_STRING(TPC_REQUEST);
1103 MFIE_STRING(TPC_REPORT);
1104 MFIE_STRING(SUPP_CHANNELS);
1105 MFIE_STRING(CSA);
1106 MFIE_STRING(MEASURE_REQUEST);
1107 MFIE_STRING(MEASURE_REPORT);
1108 MFIE_STRING(QUIET);
1109 MFIE_STRING(IBSS_DFS);
1110 MFIE_STRING(ERP_INFO);
1111 MFIE_STRING(RSN);
1112 MFIE_STRING(RATES_EX);
1113 MFIE_STRING(GENERIC);
1114 MFIE_STRING(QOS_PARAMETER);
1115 default:
1116 return "UNKNOWN";
1117 }
1118 }
1119 #endif
1120
1121 static int ieee80211_parse_info_param(struct ieee80211_info_element
1122 *info_element, u16 length,
1123 struct ieee80211_network *network)
1124 {
1125 DECLARE_SSID_BUF(ssid);
1126 u8 i;
1127 #ifdef CONFIG_IEEE80211_DEBUG
1128 char rates_str[64];
1129 char *p;
1130 #endif
1131
1132 while (length >= sizeof(*info_element)) {
1133 if (sizeof(*info_element) + info_element->len > length) {
1134 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
1135 "info_element->len + 2 > left : "
1136 "info_element->len+2=%zd left=%d, id=%d.\n",
1137 info_element->len +
1138 sizeof(*info_element),
1139 length, info_element->id);
1140 /* We stop processing but don't return an error here
1141 * because some misbehaviour APs break this rule. ie.
1142 * Orinoco AP1000. */
1143 break;
1144 }
1145
1146 switch (info_element->id) {
1147 case MFIE_TYPE_SSID:
1148 network->ssid_len = min(info_element->len,
1149 (u8) IW_ESSID_MAX_SIZE);
1150 memcpy(network->ssid, info_element->data,
1151 network->ssid_len);
1152 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1153 memset(network->ssid + network->ssid_len, 0,
1154 IW_ESSID_MAX_SIZE - network->ssid_len);
1155
1156 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1157 print_ssid(ssid, network->ssid,
1158 network->ssid_len),
1159 network->ssid_len);
1160 break;
1161
1162 case MFIE_TYPE_RATES:
1163 #ifdef CONFIG_IEEE80211_DEBUG
1164 p = rates_str;
1165 #endif
1166 network->rates_len = min(info_element->len,
1167 MAX_RATES_LENGTH);
1168 for (i = 0; i < network->rates_len; i++) {
1169 network->rates[i] = info_element->data[i];
1170 #ifdef CONFIG_IEEE80211_DEBUG
1171 p += snprintf(p, sizeof(rates_str) -
1172 (p - rates_str), "%02X ",
1173 network->rates[i]);
1174 #endif
1175 if (ieee80211_is_ofdm_rate
1176 (info_element->data[i])) {
1177 network->flags |= NETWORK_HAS_OFDM;
1178 if (info_element->data[i] &
1179 IEEE80211_BASIC_RATE_MASK)
1180 network->flags &=
1181 ~NETWORK_HAS_CCK;
1182 }
1183 }
1184
1185 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1186 rates_str, network->rates_len);
1187 break;
1188
1189 case MFIE_TYPE_RATES_EX:
1190 #ifdef CONFIG_IEEE80211_DEBUG
1191 p = rates_str;
1192 #endif
1193 network->rates_ex_len = min(info_element->len,
1194 MAX_RATES_EX_LENGTH);
1195 for (i = 0; i < network->rates_ex_len; i++) {
1196 network->rates_ex[i] = info_element->data[i];
1197 #ifdef CONFIG_IEEE80211_DEBUG
1198 p += snprintf(p, sizeof(rates_str) -
1199 (p - rates_str), "%02X ",
1200 network->rates[i]);
1201 #endif
1202 if (ieee80211_is_ofdm_rate
1203 (info_element->data[i])) {
1204 network->flags |= NETWORK_HAS_OFDM;
1205 if (info_element->data[i] &
1206 IEEE80211_BASIC_RATE_MASK)
1207 network->flags &=
1208 ~NETWORK_HAS_CCK;
1209 }
1210 }
1211
1212 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1213 rates_str, network->rates_ex_len);
1214 break;
1215
1216 case MFIE_TYPE_DS_SET:
1217 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1218 info_element->data[0]);
1219 network->channel = info_element->data[0];
1220 break;
1221
1222 case MFIE_TYPE_FH_SET:
1223 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1224 break;
1225
1226 case MFIE_TYPE_CF_SET:
1227 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1228 break;
1229
1230 case MFIE_TYPE_TIM:
1231 network->tim.tim_count = info_element->data[0];
1232 network->tim.tim_period = info_element->data[1];
1233 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1234 break;
1235
1236 case MFIE_TYPE_ERP_INFO:
1237 network->erp_value = info_element->data[0];
1238 network->flags |= NETWORK_HAS_ERP_VALUE;
1239 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1240 network->erp_value);
1241 break;
1242
1243 case MFIE_TYPE_IBSS_SET:
1244 network->atim_window = info_element->data[0];
1245 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1246 network->atim_window);
1247 break;
1248
1249 case MFIE_TYPE_CHALLENGE:
1250 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1251 break;
1252
1253 case MFIE_TYPE_GENERIC:
1254 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1255 info_element->len);
1256 if (!ieee80211_parse_qos_info_param_IE(info_element,
1257 network))
1258 break;
1259
1260 if (info_element->len >= 4 &&
1261 info_element->data[0] == 0x00 &&
1262 info_element->data[1] == 0x50 &&
1263 info_element->data[2] == 0xf2 &&
1264 info_element->data[3] == 0x01) {
1265 network->wpa_ie_len = min(info_element->len + 2,
1266 MAX_WPA_IE_LEN);
1267 memcpy(network->wpa_ie, info_element,
1268 network->wpa_ie_len);
1269 }
1270 break;
1271
1272 case MFIE_TYPE_RSN:
1273 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1274 info_element->len);
1275 network->rsn_ie_len = min(info_element->len + 2,
1276 MAX_WPA_IE_LEN);
1277 memcpy(network->rsn_ie, info_element,
1278 network->rsn_ie_len);
1279 break;
1280
1281 case MFIE_TYPE_QOS_PARAMETER:
1282 printk(KERN_ERR
1283 "QoS Error need to parse QOS_PARAMETER IE\n");
1284 break;
1285 /* 802.11h */
1286 case MFIE_TYPE_POWER_CONSTRAINT:
1287 network->power_constraint = info_element->data[0];
1288 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1289 break;
1290
1291 case MFIE_TYPE_CSA:
1292 network->power_constraint = info_element->data[0];
1293 network->flags |= NETWORK_HAS_CSA;
1294 break;
1295
1296 case MFIE_TYPE_QUIET:
1297 network->quiet.count = info_element->data[0];
1298 network->quiet.period = info_element->data[1];
1299 network->quiet.duration = info_element->data[2];
1300 network->quiet.offset = info_element->data[3];
1301 network->flags |= NETWORK_HAS_QUIET;
1302 break;
1303
1304 case MFIE_TYPE_IBSS_DFS:
1305 if (network->ibss_dfs)
1306 break;
1307 network->ibss_dfs = kmemdup(info_element->data,
1308 info_element->len,
1309 GFP_ATOMIC);
1310 if (!network->ibss_dfs)
1311 return 1;
1312 network->flags |= NETWORK_HAS_IBSS_DFS;
1313 break;
1314
1315 case MFIE_TYPE_TPC_REPORT:
1316 network->tpc_report.transmit_power =
1317 info_element->data[0];
1318 network->tpc_report.link_margin = info_element->data[1];
1319 network->flags |= NETWORK_HAS_TPC_REPORT;
1320 break;
1321
1322 default:
1323 IEEE80211_DEBUG_MGMT
1324 ("Unsupported info element: %s (%d)\n",
1325 get_info_element_string(info_element->id),
1326 info_element->id);
1327 break;
1328 }
1329
1330 length -= sizeof(*info_element) + info_element->len;
1331 info_element =
1332 (struct ieee80211_info_element *)&info_element->
1333 data[info_element->len];
1334 }
1335
1336 return 0;
1337 }
1338
1339 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1340 *frame, struct ieee80211_rx_stats *stats)
1341 {
1342 struct ieee80211_network network_resp = {
1343 .ibss_dfs = NULL,
1344 };
1345 struct ieee80211_network *network = &network_resp;
1346 struct net_device *dev = ieee->dev;
1347
1348 network->flags = 0;
1349 network->qos_data.active = 0;
1350 network->qos_data.supported = 0;
1351 network->qos_data.param_count = 0;
1352 network->qos_data.old_param_count = 0;
1353
1354 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1355 network->atim_window = le16_to_cpu(frame->aid);
1356 network->listen_interval = le16_to_cpu(frame->status);
1357 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1358 network->capability = le16_to_cpu(frame->capability);
1359 network->last_scanned = jiffies;
1360 network->rates_len = network->rates_ex_len = 0;
1361 network->last_associate = 0;
1362 network->ssid_len = 0;
1363 network->erp_value =
1364 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1365
1366 if (stats->freq == IEEE80211_52GHZ_BAND) {
1367 /* for A band (No DS info) */
1368 network->channel = stats->received_channel;
1369 } else
1370 network->flags |= NETWORK_HAS_CCK;
1371
1372 network->wpa_ie_len = 0;
1373 network->rsn_ie_len = 0;
1374
1375 if (ieee80211_parse_info_param
1376 (frame->info_element, stats->len - sizeof(*frame), network))
1377 return 1;
1378
1379 network->mode = 0;
1380 if (stats->freq == IEEE80211_52GHZ_BAND)
1381 network->mode = IEEE_A;
1382 else {
1383 if (network->flags & NETWORK_HAS_OFDM)
1384 network->mode |= IEEE_G;
1385 if (network->flags & NETWORK_HAS_CCK)
1386 network->mode |= IEEE_B;
1387 }
1388
1389 memcpy(&network->stats, stats, sizeof(network->stats));
1390
1391 if (ieee->handle_assoc_response != NULL)
1392 ieee->handle_assoc_response(dev, frame, network);
1393
1394 return 0;
1395 }
1396
1397 /***************************************************/
1398
1399 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1400 *beacon,
1401 struct ieee80211_network *network,
1402 struct ieee80211_rx_stats *stats)
1403 {
1404 DECLARE_SSID_BUF(ssid);
1405
1406 network->qos_data.active = 0;
1407 network->qos_data.supported = 0;
1408 network->qos_data.param_count = 0;
1409 network->qos_data.old_param_count = 0;
1410
1411 /* Pull out fixed field data */
1412 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1413 network->capability = le16_to_cpu(beacon->capability);
1414 network->last_scanned = jiffies;
1415 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1416 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1417 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1418 /* Where to pull this? beacon->listen_interval; */
1419 network->listen_interval = 0x0A;
1420 network->rates_len = network->rates_ex_len = 0;
1421 network->last_associate = 0;
1422 network->ssid_len = 0;
1423 network->flags = 0;
1424 network->atim_window = 0;
1425 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1426 0x3 : 0x0;
1427
1428 if (stats->freq == IEEE80211_52GHZ_BAND) {
1429 /* for A band (No DS info) */
1430 network->channel = stats->received_channel;
1431 } else
1432 network->flags |= NETWORK_HAS_CCK;
1433
1434 network->wpa_ie_len = 0;
1435 network->rsn_ie_len = 0;
1436
1437 if (ieee80211_parse_info_param
1438 (beacon->info_element, stats->len - sizeof(*beacon), network))
1439 return 1;
1440
1441 network->mode = 0;
1442 if (stats->freq == IEEE80211_52GHZ_BAND)
1443 network->mode = IEEE_A;
1444 else {
1445 if (network->flags & NETWORK_HAS_OFDM)
1446 network->mode |= IEEE_G;
1447 if (network->flags & NETWORK_HAS_CCK)
1448 network->mode |= IEEE_B;
1449 }
1450
1451 if (network->mode == 0) {
1452 IEEE80211_DEBUG_SCAN("Filtered out '%s (%pM)' "
1453 "network.\n",
1454 print_ssid(ssid, network->ssid,
1455 network->ssid_len),
1456 network->bssid);
1457 return 1;
1458 }
1459
1460 memcpy(&network->stats, stats, sizeof(network->stats));
1461
1462 return 0;
1463 }
1464
1465 static inline int is_same_network(struct ieee80211_network *src,
1466 struct ieee80211_network *dst)
1467 {
1468 /* A network is only a duplicate if the channel, BSSID, and ESSID
1469 * all match. We treat all <hidden> with the same BSSID and channel
1470 * as one network */
1471 return ((src->ssid_len == dst->ssid_len) &&
1472 (src->channel == dst->channel) &&
1473 !compare_ether_addr(src->bssid, dst->bssid) &&
1474 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1475 }
1476
1477 static void update_network(struct ieee80211_network *dst,
1478 struct ieee80211_network *src)
1479 {
1480 int qos_active;
1481 u8 old_param;
1482
1483 ieee80211_network_reset(dst);
1484 dst->ibss_dfs = src->ibss_dfs;
1485
1486 /* We only update the statistics if they were created by receiving
1487 * the network information on the actual channel the network is on.
1488 *
1489 * This keeps beacons received on neighbor channels from bringing
1490 * down the signal level of an AP. */
1491 if (dst->channel == src->stats.received_channel)
1492 memcpy(&dst->stats, &src->stats,
1493 sizeof(struct ieee80211_rx_stats));
1494 else
1495 IEEE80211_DEBUG_SCAN("Network %pM info received "
1496 "off channel (%d vs. %d)\n", src->bssid,
1497 dst->channel, src->stats.received_channel);
1498
1499 dst->capability = src->capability;
1500 memcpy(dst->rates, src->rates, src->rates_len);
1501 dst->rates_len = src->rates_len;
1502 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1503 dst->rates_ex_len = src->rates_ex_len;
1504
1505 dst->mode = src->mode;
1506 dst->flags = src->flags;
1507 dst->time_stamp[0] = src->time_stamp[0];
1508 dst->time_stamp[1] = src->time_stamp[1];
1509
1510 dst->beacon_interval = src->beacon_interval;
1511 dst->listen_interval = src->listen_interval;
1512 dst->atim_window = src->atim_window;
1513 dst->erp_value = src->erp_value;
1514 dst->tim = src->tim;
1515
1516 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1517 dst->wpa_ie_len = src->wpa_ie_len;
1518 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1519 dst->rsn_ie_len = src->rsn_ie_len;
1520
1521 dst->last_scanned = jiffies;
1522 qos_active = src->qos_data.active;
1523 old_param = dst->qos_data.old_param_count;
1524 if (dst->flags & NETWORK_HAS_QOS_MASK)
1525 memcpy(&dst->qos_data, &src->qos_data,
1526 sizeof(struct ieee80211_qos_data));
1527 else {
1528 dst->qos_data.supported = src->qos_data.supported;
1529 dst->qos_data.param_count = src->qos_data.param_count;
1530 }
1531
1532 if (dst->qos_data.supported == 1) {
1533 if (dst->ssid_len)
1534 IEEE80211_DEBUG_QOS
1535 ("QoS the network %s is QoS supported\n",
1536 dst->ssid);
1537 else
1538 IEEE80211_DEBUG_QOS
1539 ("QoS the network is QoS supported\n");
1540 }
1541 dst->qos_data.active = qos_active;
1542 dst->qos_data.old_param_count = old_param;
1543
1544 /* dst->last_associate is not overwritten */
1545 }
1546
1547 static inline int is_beacon(__le16 fc)
1548 {
1549 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1550 }
1551
1552 static void ieee80211_process_probe_response(struct ieee80211_device
1553 *ieee, struct
1554 ieee80211_probe_response
1555 *beacon, struct ieee80211_rx_stats
1556 *stats)
1557 {
1558 struct net_device *dev = ieee->dev;
1559 struct ieee80211_network network = {
1560 .ibss_dfs = NULL,
1561 };
1562 struct ieee80211_network *target;
1563 struct ieee80211_network *oldest = NULL;
1564 #ifdef CONFIG_IEEE80211_DEBUG
1565 struct ieee80211_info_element *info_element = beacon->info_element;
1566 #endif
1567 unsigned long flags;
1568 DECLARE_SSID_BUF(ssid);
1569
1570 IEEE80211_DEBUG_SCAN("'%s' (%pM"
1571 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1572 print_ssid(ssid, info_element->data, info_element->len),
1573 beacon->header.addr3,
1574 (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0',
1575 (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0',
1576 (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0',
1577 (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0',
1578 (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0',
1579 (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0',
1580 (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0',
1581 (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0',
1582 (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0',
1583 (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0',
1584 (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0',
1585 (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0',
1586 (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0',
1587 (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0',
1588 (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0',
1589 (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0');
1590
1591 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1592 IEEE80211_DEBUG_SCAN("Dropped '%s' (%pM) via %s.\n",
1593 print_ssid(ssid, info_element->data,
1594 info_element->len),
1595 beacon->header.addr3,
1596 is_beacon(beacon->header.frame_ctl) ?
1597 "BEACON" : "PROBE RESPONSE");
1598 return;
1599 }
1600
1601 /* The network parsed correctly -- so now we scan our known networks
1602 * to see if we can find it in our list.
1603 *
1604 * NOTE: This search is definitely not optimized. Once its doing
1605 * the "right thing" we'll optimize it for efficiency if
1606 * necessary */
1607
1608 /* Search for this entry in the list and update it if it is
1609 * already there. */
1610
1611 spin_lock_irqsave(&ieee->lock, flags);
1612
1613 list_for_each_entry(target, &ieee->network_list, list) {
1614 if (is_same_network(target, &network))
1615 break;
1616
1617 if ((oldest == NULL) ||
1618 (target->last_scanned < oldest->last_scanned))
1619 oldest = target;
1620 }
1621
1622 /* If we didn't find a match, then get a new network slot to initialize
1623 * with this beacon's information */
1624 if (&target->list == &ieee->network_list) {
1625 if (list_empty(&ieee->network_free_list)) {
1626 /* If there are no more slots, expire the oldest */
1627 list_del(&oldest->list);
1628 target = oldest;
1629 IEEE80211_DEBUG_SCAN("Expired '%s' (%pM) from "
1630 "network list.\n",
1631 print_ssid(ssid, target->ssid,
1632 target->ssid_len),
1633 target->bssid);
1634 ieee80211_network_reset(target);
1635 } else {
1636 /* Otherwise just pull from the free list */
1637 target = list_entry(ieee->network_free_list.next,
1638 struct ieee80211_network, list);
1639 list_del(ieee->network_free_list.next);
1640 }
1641
1642 #ifdef CONFIG_IEEE80211_DEBUG
1643 IEEE80211_DEBUG_SCAN("Adding '%s' (%pM) via %s.\n",
1644 print_ssid(ssid, network.ssid,
1645 network.ssid_len),
1646 network.bssid,
1647 is_beacon(beacon->header.frame_ctl) ?
1648 "BEACON" : "PROBE RESPONSE");
1649 #endif
1650 memcpy(target, &network, sizeof(*target));
1651 network.ibss_dfs = NULL;
1652 list_add_tail(&target->list, &ieee->network_list);
1653 } else {
1654 IEEE80211_DEBUG_SCAN("Updating '%s' (%pM) via %s.\n",
1655 print_ssid(ssid, target->ssid,
1656 target->ssid_len),
1657 target->bssid,
1658 is_beacon(beacon->header.frame_ctl) ?
1659 "BEACON" : "PROBE RESPONSE");
1660 update_network(target, &network);
1661 network.ibss_dfs = NULL;
1662 }
1663
1664 spin_unlock_irqrestore(&ieee->lock, flags);
1665
1666 if (is_beacon(beacon->header.frame_ctl)) {
1667 if (ieee->handle_beacon != NULL)
1668 ieee->handle_beacon(dev, beacon, target);
1669 } else {
1670 if (ieee->handle_probe_response != NULL)
1671 ieee->handle_probe_response(dev, beacon, target);
1672 }
1673 }
1674
1675 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1676 struct ieee80211_hdr_4addr *header,
1677 struct ieee80211_rx_stats *stats)
1678 {
1679 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1680 case IEEE80211_STYPE_ASSOC_RESP:
1681 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1682 WLAN_FC_GET_STYPE(le16_to_cpu
1683 (header->frame_ctl)));
1684 ieee80211_handle_assoc_resp(ieee,
1685 (struct ieee80211_assoc_response *)
1686 header, stats);
1687 break;
1688
1689 case IEEE80211_STYPE_REASSOC_RESP:
1690 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1691 WLAN_FC_GET_STYPE(le16_to_cpu
1692 (header->frame_ctl)));
1693 break;
1694
1695 case IEEE80211_STYPE_PROBE_REQ:
1696 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1697 WLAN_FC_GET_STYPE(le16_to_cpu
1698 (header->frame_ctl)));
1699
1700 if (ieee->handle_probe_request != NULL)
1701 ieee->handle_probe_request(ieee->dev,
1702 (struct
1703 ieee80211_probe_request *)
1704 header, stats);
1705 break;
1706
1707 case IEEE80211_STYPE_PROBE_RESP:
1708 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1709 WLAN_FC_GET_STYPE(le16_to_cpu
1710 (header->frame_ctl)));
1711 IEEE80211_DEBUG_SCAN("Probe response\n");
1712 ieee80211_process_probe_response(ieee,
1713 (struct
1714 ieee80211_probe_response *)
1715 header, stats);
1716 break;
1717
1718 case IEEE80211_STYPE_BEACON:
1719 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1720 WLAN_FC_GET_STYPE(le16_to_cpu
1721 (header->frame_ctl)));
1722 IEEE80211_DEBUG_SCAN("Beacon\n");
1723 ieee80211_process_probe_response(ieee,
1724 (struct
1725 ieee80211_probe_response *)
1726 header, stats);
1727 break;
1728 case IEEE80211_STYPE_AUTH:
1729
1730 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1731 WLAN_FC_GET_STYPE(le16_to_cpu
1732 (header->frame_ctl)));
1733
1734 if (ieee->handle_auth != NULL)
1735 ieee->handle_auth(ieee->dev,
1736 (struct ieee80211_auth *)header);
1737 break;
1738
1739 case IEEE80211_STYPE_DISASSOC:
1740 if (ieee->handle_disassoc != NULL)
1741 ieee->handle_disassoc(ieee->dev,
1742 (struct ieee80211_disassoc *)
1743 header);
1744 break;
1745
1746 case IEEE80211_STYPE_ACTION:
1747 IEEE80211_DEBUG_MGMT("ACTION\n");
1748 if (ieee->handle_action)
1749 ieee->handle_action(ieee->dev,
1750 (struct ieee80211_action *)
1751 header, stats);
1752 break;
1753
1754 case IEEE80211_STYPE_REASSOC_REQ:
1755 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1756 WLAN_FC_GET_STYPE(le16_to_cpu
1757 (header->frame_ctl)));
1758
1759 IEEE80211_DEBUG_MGMT("%s: IEEE80211_REASSOC_REQ received\n",
1760 ieee->dev->name);
1761 if (ieee->handle_reassoc_request != NULL)
1762 ieee->handle_reassoc_request(ieee->dev,
1763 (struct ieee80211_reassoc_request *)
1764 header);
1765 break;
1766
1767 case IEEE80211_STYPE_ASSOC_REQ:
1768 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1769 WLAN_FC_GET_STYPE(le16_to_cpu
1770 (header->frame_ctl)));
1771
1772 IEEE80211_DEBUG_MGMT("%s: IEEE80211_ASSOC_REQ received\n",
1773 ieee->dev->name);
1774 if (ieee->handle_assoc_request != NULL)
1775 ieee->handle_assoc_request(ieee->dev);
1776 break;
1777
1778 case IEEE80211_STYPE_DEAUTH:
1779 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1780 if (ieee->handle_deauth != NULL)
1781 ieee->handle_deauth(ieee->dev,
1782 (struct ieee80211_deauth *)
1783 header);
1784 break;
1785 default:
1786 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1787 WLAN_FC_GET_STYPE(le16_to_cpu
1788 (header->frame_ctl)));
1789 IEEE80211_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1790 ieee->dev->name,
1791 WLAN_FC_GET_STYPE(le16_to_cpu
1792 (header->frame_ctl)));
1793 break;
1794 }
1795 }
1796
1797 EXPORT_SYMBOL_GPL(ieee80211_rx_any);
1798 EXPORT_SYMBOL(ieee80211_rx_mgt);
1799 EXPORT_SYMBOL(ieee80211_rx);
Support for the Chinese Samsung S3C2440 based development boards