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[deliverable/linux.git] / net / ieee80211 / ieee80211_rx.c
1 /*
2 * Original code based Host AP (software wireless LAN access point) driver
3 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
4 *
5 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
6 * <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/ieee80211.h>
36
37 static void ieee80211_monitor_rx(struct ieee80211_device *ieee,
38 struct sk_buff *skb,
39 struct ieee80211_rx_stats *rx_stats)
40 {
41 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
42 u16 fc = le16_to_cpu(hdr->frame_ctl);
43
44 skb->dev = ieee->dev;
45 skb_reset_mac_header(skb);
46 skb_pull(skb, ieee80211_get_hdrlen(fc));
47 skb->pkt_type = PACKET_OTHERHOST;
48 skb->protocol = __constant_htons(ETH_P_80211_RAW);
49 memset(skb->cb, 0, sizeof(skb->cb));
50 netif_rx(skb);
51 }
52
53 /* Called only as a tasklet (software IRQ) */
54 static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
55 ieee80211_device
56 *ieee,
57 unsigned int seq,
58 unsigned int frag,
59 u8 * src,
60 u8 * dst)
61 {
62 struct ieee80211_frag_entry *entry;
63 int i;
64
65 for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
66 entry = &ieee->frag_cache[i];
67 if (entry->skb != NULL &&
68 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
69 IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
70 "seq=%u last_frag=%u\n",
71 entry->seq, entry->last_frag);
72 dev_kfree_skb_any(entry->skb);
73 entry->skb = NULL;
74 }
75
76 if (entry->skb != NULL && entry->seq == seq &&
77 (entry->last_frag + 1 == frag || frag == -1) &&
78 !compare_ether_addr(entry->src_addr, src) &&
79 !compare_ether_addr(entry->dst_addr, dst))
80 return entry;
81 }
82
83 return NULL;
84 }
85
86 /* Called only as a tasklet (software IRQ) */
87 static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
88 struct ieee80211_hdr_4addr *hdr)
89 {
90 struct sk_buff *skb = NULL;
91 u16 sc;
92 unsigned int frag, seq;
93 struct ieee80211_frag_entry *entry;
94
95 sc = le16_to_cpu(hdr->seq_ctl);
96 frag = WLAN_GET_SEQ_FRAG(sc);
97 seq = WLAN_GET_SEQ_SEQ(sc);
98
99 if (frag == 0) {
100 /* Reserve enough space to fit maximum frame length */
101 skb = dev_alloc_skb(ieee->dev->mtu +
102 sizeof(struct ieee80211_hdr_4addr) +
103 8 /* LLC */ +
104 2 /* alignment */ +
105 8 /* WEP */ + ETH_ALEN /* WDS */ );
106 if (skb == NULL)
107 return NULL;
108
109 entry = &ieee->frag_cache[ieee->frag_next_idx];
110 ieee->frag_next_idx++;
111 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
112 ieee->frag_next_idx = 0;
113
114 if (entry->skb != NULL)
115 dev_kfree_skb_any(entry->skb);
116
117 entry->first_frag_time = jiffies;
118 entry->seq = seq;
119 entry->last_frag = frag;
120 entry->skb = skb;
121 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
122 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
123 } else {
124 /* received a fragment of a frame for which the head fragment
125 * should have already been received */
126 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
127 hdr->addr1);
128 if (entry != NULL) {
129 entry->last_frag = frag;
130 skb = entry->skb;
131 }
132 }
133
134 return skb;
135 }
136
137 /* Called only as a tasklet (software IRQ) */
138 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
139 struct ieee80211_hdr_4addr *hdr)
140 {
141 u16 sc;
142 unsigned int seq;
143 struct ieee80211_frag_entry *entry;
144
145 sc = le16_to_cpu(hdr->seq_ctl);
146 seq = WLAN_GET_SEQ_SEQ(sc);
147
148 entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
149 hdr->addr1);
150
151 if (entry == NULL) {
152 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
153 "entry (seq=%u)\n", seq);
154 return -1;
155 }
156
157 entry->skb = NULL;
158 return 0;
159 }
160
161 #ifdef NOT_YET
162 /* ieee80211_rx_frame_mgtmt
163 *
164 * Responsible for handling management control frames
165 *
166 * Called by ieee80211_rx */
167 static int
168 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
169 struct ieee80211_rx_stats *rx_stats, u16 type,
170 u16 stype)
171 {
172 if (ieee->iw_mode == IW_MODE_MASTER) {
173 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
174 ieee->dev->name);
175 return 0;
176 /*
177 hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
178 skb->data);*/
179 }
180
181 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
182 if (stype == WLAN_FC_STYPE_BEACON &&
183 ieee->iw_mode == IW_MODE_MASTER) {
184 struct sk_buff *skb2;
185 /* Process beacon frames also in kernel driver to
186 * update STA(AP) table statistics */
187 skb2 = skb_clone(skb, GFP_ATOMIC);
188 if (skb2)
189 hostap_rx(skb2->dev, skb2, rx_stats);
190 }
191
192 /* send management frames to the user space daemon for
193 * processing */
194 ieee->apdevstats.rx_packets++;
195 ieee->apdevstats.rx_bytes += skb->len;
196 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
197 return 0;
198 }
199
200 if (ieee->iw_mode == IW_MODE_MASTER) {
201 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
202 printk(KERN_DEBUG "%s: unknown management frame "
203 "(type=0x%02x, stype=0x%02x) dropped\n",
204 skb->dev->name, type, stype);
205 return -1;
206 }
207
208 hostap_rx(skb->dev, skb, rx_stats);
209 return 0;
210 }
211
212 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
213 "received in non-Host AP mode\n", skb->dev->name);
214 return -1;
215 }
216 #endif
217
218 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
219 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
220 static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
221
222 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
223 static unsigned char bridge_tunnel_header[] =
224 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
225 /* No encapsulation header if EtherType < 0x600 (=length) */
226
227 /* Called by ieee80211_rx_frame_decrypt */
228 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
229 struct sk_buff *skb)
230 {
231 struct net_device *dev = ieee->dev;
232 u16 fc, ethertype;
233 struct ieee80211_hdr_3addr *hdr;
234 u8 *pos;
235
236 if (skb->len < 24)
237 return 0;
238
239 hdr = (struct ieee80211_hdr_3addr *)skb->data;
240 fc = le16_to_cpu(hdr->frame_ctl);
241
242 /* check that the frame is unicast frame to us */
243 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
244 IEEE80211_FCTL_TODS &&
245 !compare_ether_addr(hdr->addr1, dev->dev_addr) &&
246 !compare_ether_addr(hdr->addr3, dev->dev_addr)) {
247 /* ToDS frame with own addr BSSID and DA */
248 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
249 IEEE80211_FCTL_FROMDS &&
250 !compare_ether_addr(hdr->addr1, dev->dev_addr)) {
251 /* FromDS frame with own addr as DA */
252 } else
253 return 0;
254
255 if (skb->len < 24 + 8)
256 return 0;
257
258 /* check for port access entity Ethernet type */
259 pos = skb->data + 24;
260 ethertype = (pos[6] << 8) | pos[7];
261 if (ethertype == ETH_P_PAE)
262 return 1;
263
264 return 0;
265 }
266
267 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
268 static int
269 ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
270 struct ieee80211_crypt_data *crypt)
271 {
272 struct ieee80211_hdr_3addr *hdr;
273 int res, hdrlen;
274
275 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
276 return 0;
277
278 hdr = (struct ieee80211_hdr_3addr *)skb->data;
279 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
280
281 atomic_inc(&crypt->refcnt);
282 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
283 atomic_dec(&crypt->refcnt);
284 if (res < 0) {
285 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
286 ") res=%d\n", MAC_ARG(hdr->addr2), res);
287 if (res == -2)
288 IEEE80211_DEBUG_DROP("Decryption failed ICV "
289 "mismatch (key %d)\n",
290 skb->data[hdrlen + 3] >> 6);
291 ieee->ieee_stats.rx_discards_undecryptable++;
292 return -1;
293 }
294
295 return res;
296 }
297
298 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
299 static int
300 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
301 struct sk_buff *skb, int keyidx,
302 struct ieee80211_crypt_data *crypt)
303 {
304 struct ieee80211_hdr_3addr *hdr;
305 int res, hdrlen;
306
307 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
308 return 0;
309
310 hdr = (struct ieee80211_hdr_3addr *)skb->data;
311 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
312
313 atomic_inc(&crypt->refcnt);
314 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
315 atomic_dec(&crypt->refcnt);
316 if (res < 0) {
317 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
318 " (SA=" MAC_FMT " keyidx=%d)\n",
319 ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
320 return -1;
321 }
322
323 return 0;
324 }
325
326 /* All received frames are sent to this function. @skb contains the frame in
327 * IEEE 802.11 format, i.e., in the format it was sent over air.
328 * This function is called only as a tasklet (software IRQ). */
329 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
330 struct ieee80211_rx_stats *rx_stats)
331 {
332 struct net_device *dev = ieee->dev;
333 struct ieee80211_hdr_4addr *hdr;
334 size_t hdrlen;
335 u16 fc, type, stype, sc;
336 struct net_device_stats *stats;
337 unsigned int frag;
338 u8 *payload;
339 u16 ethertype;
340 #ifdef NOT_YET
341 struct net_device *wds = NULL;
342 struct sk_buff *skb2 = NULL;
343 struct net_device *wds = NULL;
344 int frame_authorized = 0;
345 int from_assoc_ap = 0;
346 void *sta = NULL;
347 #endif
348 u8 dst[ETH_ALEN];
349 u8 src[ETH_ALEN];
350 struct ieee80211_crypt_data *crypt = NULL;
351 int keyidx = 0;
352 int can_be_decrypted = 0;
353
354 hdr = (struct ieee80211_hdr_4addr *)skb->data;
355 stats = &ieee->stats;
356
357 if (skb->len < 10) {
358 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
359 goto rx_dropped;
360 }
361
362 fc = le16_to_cpu(hdr->frame_ctl);
363 type = WLAN_FC_GET_TYPE(fc);
364 stype = WLAN_FC_GET_STYPE(fc);
365 sc = le16_to_cpu(hdr->seq_ctl);
366 frag = WLAN_GET_SEQ_FRAG(sc);
367 hdrlen = ieee80211_get_hdrlen(fc);
368
369 if (skb->len < hdrlen) {
370 printk(KERN_INFO "%s: invalid SKB length %d\n",
371 dev->name, skb->len);
372 goto rx_dropped;
373 }
374
375 /* Put this code here so that we avoid duplicating it in all
376 * Rx paths. - Jean II */
377 #ifdef CONFIG_WIRELESS_EXT
378 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
379 /* If spy monitoring on */
380 if (ieee->spy_data.spy_number > 0) {
381 struct iw_quality wstats;
382
383 wstats.updated = 0;
384 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
385 wstats.level = rx_stats->rssi;
386 wstats.updated |= IW_QUAL_LEVEL_UPDATED;
387 } else
388 wstats.updated |= IW_QUAL_LEVEL_INVALID;
389
390 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
391 wstats.noise = rx_stats->noise;
392 wstats.updated |= IW_QUAL_NOISE_UPDATED;
393 } else
394 wstats.updated |= IW_QUAL_NOISE_INVALID;
395
396 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
397 wstats.qual = rx_stats->signal;
398 wstats.updated |= IW_QUAL_QUAL_UPDATED;
399 } else
400 wstats.updated |= IW_QUAL_QUAL_INVALID;
401
402 /* Update spy records */
403 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
404 }
405 #endif /* IW_WIRELESS_SPY */
406 #endif /* CONFIG_WIRELESS_EXT */
407
408 #ifdef NOT_YET
409 hostap_update_rx_stats(local->ap, hdr, rx_stats);
410 #endif
411
412 if (ieee->iw_mode == IW_MODE_MONITOR) {
413 stats->rx_packets++;
414 stats->rx_bytes += skb->len;
415 ieee80211_monitor_rx(ieee, skb, rx_stats);
416 return 1;
417 }
418
419 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
420 is_broadcast_ether_addr(hdr->addr2)) ?
421 ieee->host_mc_decrypt : ieee->host_decrypt;
422
423 if (can_be_decrypted) {
424 if (skb->len >= hdrlen + 3) {
425 /* Top two-bits of byte 3 are the key index */
426 keyidx = skb->data[hdrlen + 3] >> 6;
427 }
428
429 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx
430 * is only allowed 2-bits of storage, no value of keyidx can
431 * be provided via above code that would result in keyidx
432 * being out of range */
433 crypt = ieee->crypt[keyidx];
434
435 #ifdef NOT_YET
436 sta = NULL;
437
438 /* Use station specific key to override default keys if the
439 * receiver address is a unicast address ("individual RA"). If
440 * bcrx_sta_key parameter is set, station specific key is used
441 * even with broad/multicast targets (this is against IEEE
442 * 802.11, but makes it easier to use different keys with
443 * stations that do not support WEP key mapping). */
444
445 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
446 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
447 &sta);
448 #endif
449
450 /* allow NULL decrypt to indicate an station specific override
451 * for default encryption */
452 if (crypt && (crypt->ops == NULL ||
453 crypt->ops->decrypt_mpdu == NULL))
454 crypt = NULL;
455
456 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
457 /* This seems to be triggered by some (multicast?)
458 * frames from other than current BSS, so just drop the
459 * frames silently instead of filling system log with
460 * these reports. */
461 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
462 " (SA=" MAC_FMT ")\n",
463 MAC_ARG(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 " MAC_FMT "\n", dev->name,
475 MAC_ARG(hdr->addr2));
476 /* TODO: could inform hostapd about this so that it
477 * could send auth failure report */
478 goto rx_dropped;
479 }
480
481 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
482 goto rx_dropped;
483 else
484 goto rx_exit;
485 }
486 #endif
487 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
488 if (sc == ieee->prev_seq_ctl)
489 goto rx_dropped;
490 else
491 ieee->prev_seq_ctl = sc;
492
493 /* Data frame - extract src/dst addresses */
494 if (skb->len < IEEE80211_3ADDR_LEN)
495 goto rx_dropped;
496
497 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
498 case IEEE80211_FCTL_FROMDS:
499 memcpy(dst, hdr->addr1, ETH_ALEN);
500 memcpy(src, hdr->addr3, ETH_ALEN);
501 break;
502 case IEEE80211_FCTL_TODS:
503 memcpy(dst, hdr->addr3, ETH_ALEN);
504 memcpy(src, hdr->addr2, ETH_ALEN);
505 break;
506 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
507 if (skb->len < IEEE80211_4ADDR_LEN)
508 goto rx_dropped;
509 memcpy(dst, hdr->addr3, ETH_ALEN);
510 memcpy(src, hdr->addr4, ETH_ALEN);
511 break;
512 case 0:
513 memcpy(dst, hdr->addr1, ETH_ALEN);
514 memcpy(src, hdr->addr2, ETH_ALEN);
515 break;
516 }
517
518 #ifdef NOT_YET
519 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
520 goto rx_dropped;
521 if (wds) {
522 skb->dev = dev = wds;
523 stats = hostap_get_stats(dev);
524 }
525
526 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
527 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
528 IEEE80211_FCTL_FROMDS && ieee->stadev
529 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
530 /* Frame from BSSID of the AP for which we are a client */
531 skb->dev = dev = ieee->stadev;
532 stats = hostap_get_stats(dev);
533 from_assoc_ap = 1;
534 }
535 #endif
536
537 dev->last_rx = jiffies;
538
539 #ifdef NOT_YET
540 if ((ieee->iw_mode == IW_MODE_MASTER ||
541 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
542 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
543 wds != NULL)) {
544 case AP_RX_CONTINUE_NOT_AUTHORIZED:
545 frame_authorized = 0;
546 break;
547 case AP_RX_CONTINUE:
548 frame_authorized = 1;
549 break;
550 case AP_RX_DROP:
551 goto rx_dropped;
552 case AP_RX_EXIT:
553 goto rx_exit;
554 }
555 }
556 #endif
557
558 /* Nullfunc frames may have PS-bit set, so they must be passed to
559 * hostap_handle_sta_rx() before being dropped here. */
560
561 stype &= ~IEEE80211_STYPE_QOS_DATA;
562
563 if (stype != IEEE80211_STYPE_DATA &&
564 stype != IEEE80211_STYPE_DATA_CFACK &&
565 stype != IEEE80211_STYPE_DATA_CFPOLL &&
566 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
567 if (stype != IEEE80211_STYPE_NULLFUNC)
568 IEEE80211_DEBUG_DROP("RX: dropped data frame "
569 "with no data (type=0x%02x, "
570 "subtype=0x%02x, len=%d)\n",
571 type, stype, skb->len);
572 goto rx_dropped;
573 }
574
575 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
576
577 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
578 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
579 goto rx_dropped;
580
581 hdr = (struct ieee80211_hdr_4addr *)skb->data;
582
583 /* skb: hdr + (possibly fragmented) plaintext payload */
584 // PR: FIXME: hostap has additional conditions in the "if" below:
585 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
586 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
587 int flen;
588 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
589 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
590
591 if (!frag_skb) {
592 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
593 "Rx cannot get skb from fragment "
594 "cache (morefrag=%d seq=%u frag=%u)\n",
595 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
596 WLAN_GET_SEQ_SEQ(sc), frag);
597 goto rx_dropped;
598 }
599
600 flen = skb->len;
601 if (frag != 0)
602 flen -= hdrlen;
603
604 if (frag_skb->tail + flen > frag_skb->end) {
605 printk(KERN_WARNING "%s: host decrypted and "
606 "reassembled frame did not fit skb\n",
607 dev->name);
608 ieee80211_frag_cache_invalidate(ieee, hdr);
609 goto rx_dropped;
610 }
611
612 if (frag == 0) {
613 /* copy first fragment (including full headers) into
614 * beginning of the fragment cache skb */
615 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);
616 } else {
617 /* append frame payload to the end of the fragment
618 * cache skb */
619 skb_copy_from_linear_data_offset(skb, hdrlen,
620 skb_put(frag_skb, flen), flen);
621 }
622 dev_kfree_skb_any(skb);
623 skb = NULL;
624
625 if (fc & IEEE80211_FCTL_MOREFRAGS) {
626 /* more fragments expected - leave the skb in fragment
627 * cache for now; it will be delivered to upper layers
628 * after all fragments have been received */
629 goto rx_exit;
630 }
631
632 /* this was the last fragment and the frame will be
633 * delivered, so remove skb from fragment cache */
634 skb = frag_skb;
635 hdr = (struct ieee80211_hdr_4addr *)skb->data;
636 ieee80211_frag_cache_invalidate(ieee, hdr);
637 }
638
639 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
640 * encrypted/authenticated */
641 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
642 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
643 goto rx_dropped;
644
645 hdr = (struct ieee80211_hdr_4addr *)skb->data;
646 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
647 if ( /*ieee->ieee802_1x && */
648 ieee80211_is_eapol_frame(ieee, skb)) {
649 /* pass unencrypted EAPOL frames even if encryption is
650 * configured */
651 } else {
652 IEEE80211_DEBUG_DROP("encryption configured, but RX "
653 "frame not encrypted (SA=" MAC_FMT
654 ")\n", MAC_ARG(hdr->addr2));
655 goto rx_dropped;
656 }
657 }
658
659 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
660 !ieee80211_is_eapol_frame(ieee, skb)) {
661 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
662 "frame from " MAC_FMT
663 " (drop_unencrypted=1)\n",
664 MAC_ARG(hdr->addr2));
665 goto rx_dropped;
666 }
667
668 /* If the frame was decrypted in hardware, we may need to strip off
669 * any security data (IV, ICV, etc) that was left behind */
670 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&
671 ieee->host_strip_iv_icv) {
672 int trimlen = 0;
673
674 /* Top two-bits of byte 3 are the key index */
675 if (skb->len >= hdrlen + 3)
676 keyidx = skb->data[hdrlen + 3] >> 6;
677
678 /* To strip off any security data which appears before the
679 * payload, we simply increase hdrlen (as the header gets
680 * chopped off immediately below). For the security data which
681 * appears after the payload, we use skb_trim. */
682
683 switch (ieee->sec.encode_alg[keyidx]) {
684 case SEC_ALG_WEP:
685 /* 4 byte IV */
686 hdrlen += 4;
687 /* 4 byte ICV */
688 trimlen = 4;
689 break;
690 case SEC_ALG_TKIP:
691 /* 4 byte IV, 4 byte ExtIV */
692 hdrlen += 8;
693 /* 8 byte MIC, 4 byte ICV */
694 trimlen = 12;
695 break;
696 case SEC_ALG_CCMP:
697 /* 8 byte CCMP header */
698 hdrlen += 8;
699 /* 8 byte MIC */
700 trimlen = 8;
701 break;
702 }
703
704 if (skb->len < trimlen)
705 goto rx_dropped;
706
707 __skb_trim(skb, skb->len - trimlen);
708
709 if (skb->len < hdrlen)
710 goto rx_dropped;
711 }
712
713 /* skb: hdr + (possible reassembled) full plaintext payload */
714
715 payload = skb->data + hdrlen;
716 ethertype = (payload[6] << 8) | payload[7];
717
718 #ifdef NOT_YET
719 /* If IEEE 802.1X is used, check whether the port is authorized to send
720 * the received frame. */
721 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
722 if (ethertype == ETH_P_PAE) {
723 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
724 dev->name);
725 if (ieee->hostapd && ieee->apdev) {
726 /* Send IEEE 802.1X frames to the user
727 * space daemon for processing */
728 prism2_rx_80211(ieee->apdev, skb, rx_stats,
729 PRISM2_RX_MGMT);
730 ieee->apdevstats.rx_packets++;
731 ieee->apdevstats.rx_bytes += skb->len;
732 goto rx_exit;
733 }
734 } else if (!frame_authorized) {
735 printk(KERN_DEBUG "%s: dropped frame from "
736 "unauthorized port (IEEE 802.1X): "
737 "ethertype=0x%04x\n", dev->name, ethertype);
738 goto rx_dropped;
739 }
740 }
741 #endif
742
743 /* convert hdr + possible LLC headers into Ethernet header */
744 if (skb->len - hdrlen >= 8 &&
745 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
746 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
747 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
748 /* remove RFC1042 or Bridge-Tunnel encapsulation and
749 * replace EtherType */
750 skb_pull(skb, hdrlen + SNAP_SIZE);
751 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
752 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
753 } else {
754 u16 len;
755 /* Leave Ethernet header part of hdr and full payload */
756 skb_pull(skb, hdrlen);
757 len = htons(skb->len);
758 memcpy(skb_push(skb, 2), &len, 2);
759 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
760 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
761 }
762
763 #ifdef NOT_YET
764 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
765 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
766 /* Non-standard frame: get addr4 from its bogus location after
767 * the payload */
768 skb_copy_to_linear_data_offset(skb, ETH_ALEN,
769 skb->data + skb->len - ETH_ALEN,
770 ETH_ALEN);
771 skb_trim(skb, skb->len - ETH_ALEN);
772 }
773 #endif
774
775 stats->rx_packets++;
776 stats->rx_bytes += skb->len;
777
778 #ifdef NOT_YET
779 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
780 if (dst[0] & 0x01) {
781 /* copy multicast frame both to the higher layers and
782 * to the wireless media */
783 ieee->ap->bridged_multicast++;
784 skb2 = skb_clone(skb, GFP_ATOMIC);
785 if (skb2 == NULL)
786 printk(KERN_DEBUG "%s: skb_clone failed for "
787 "multicast frame\n", dev->name);
788 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
789 /* send frame directly to the associated STA using
790 * wireless media and not passing to higher layers */
791 ieee->ap->bridged_unicast++;
792 skb2 = skb;
793 skb = NULL;
794 }
795 }
796
797 if (skb2 != NULL) {
798 /* send to wireless media */
799 skb2->dev = dev;
800 skb2->protocol = __constant_htons(ETH_P_802_3);
801 skb_reset_mac_header(skb2);
802 skb_reset_network_header(skb2);
803 /* skb2->network_header += ETH_HLEN; */
804 dev_queue_xmit(skb2);
805 }
806 #endif
807
808 if (skb) {
809 skb->protocol = eth_type_trans(skb, dev);
810 memset(skb->cb, 0, sizeof(skb->cb));
811 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
812 if (netif_rx(skb) == NET_RX_DROP) {
813 /* netif_rx always succeeds, but it might drop
814 * the packet. If it drops the packet, we log that
815 * in our stats. */
816 IEEE80211_DEBUG_DROP
817 ("RX: netif_rx dropped the packet\n");
818 stats->rx_dropped++;
819 }
820 }
821
822 rx_exit:
823 #ifdef NOT_YET
824 if (sta)
825 hostap_handle_sta_release(sta);
826 #endif
827 return 1;
828
829 rx_dropped:
830 stats->rx_dropped++;
831
832 /* Returning 0 indicates to caller that we have not handled the SKB--
833 * so it is still allocated and can be used again by underlying
834 * hardware as a DMA target */
835 return 0;
836 }
837
838 /* Filter out unrelated packets, call ieee80211_rx[_mgt]
839 * This function takes over the skb, it should not be used again after calling
840 * this function. */
841 void ieee80211_rx_any(struct ieee80211_device *ieee,
842 struct sk_buff *skb, struct ieee80211_rx_stats *stats)
843 {
844 struct ieee80211_hdr_4addr *hdr;
845 int is_packet_for_us;
846 u16 fc;
847
848 if (ieee->iw_mode == IW_MODE_MONITOR) {
849 if (!ieee80211_rx(ieee, skb, stats))
850 dev_kfree_skb_irq(skb);
851 return;
852 }
853
854 if (skb->len < sizeof(struct ieee80211_hdr))
855 goto drop_free;
856
857 hdr = (struct ieee80211_hdr_4addr *)skb->data;
858 fc = le16_to_cpu(hdr->frame_ctl);
859
860 if ((fc & IEEE80211_FCTL_VERS) != 0)
861 goto drop_free;
862
863 switch (fc & IEEE80211_FCTL_FTYPE) {
864 case IEEE80211_FTYPE_MGMT:
865 if (skb->len < sizeof(struct ieee80211_hdr_3addr))
866 goto drop_free;
867 ieee80211_rx_mgt(ieee, hdr, stats);
868 dev_kfree_skb_irq(skb);
869 return;
870 case IEEE80211_FTYPE_DATA:
871 break;
872 case IEEE80211_FTYPE_CTL:
873 return;
874 default:
875 return;
876 }
877
878 is_packet_for_us = 0;
879 switch (ieee->iw_mode) {
880 case IW_MODE_ADHOC:
881 /* our BSS and not from/to DS */
882 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
883 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
884 /* promisc: get all */
885 if (ieee->dev->flags & IFF_PROMISC)
886 is_packet_for_us = 1;
887 /* to us */
888 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
889 is_packet_for_us = 1;
890 /* mcast */
891 else if (is_multicast_ether_addr(hdr->addr1))
892 is_packet_for_us = 1;
893 }
894 break;
895 case IW_MODE_INFRA:
896 /* our BSS (== from our AP) and from DS */
897 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
898 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
899 /* promisc: get all */
900 if (ieee->dev->flags & IFF_PROMISC)
901 is_packet_for_us = 1;
902 /* to us */
903 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
904 is_packet_for_us = 1;
905 /* mcast */
906 else if (is_multicast_ether_addr(hdr->addr1)) {
907 /* not our own packet bcasted from AP */
908 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
909 is_packet_for_us = 1;
910 }
911 }
912 break;
913 default:
914 /* ? */
915 break;
916 }
917
918 if (is_packet_for_us)
919 if (!ieee80211_rx(ieee, skb, stats))
920 dev_kfree_skb_irq(skb);
921 return;
922
923 drop_free:
924 dev_kfree_skb_irq(skb);
925 ieee->stats.rx_dropped++;
926 return;
927 }
928
929 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
930
931 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
932
933 /*
934 * Make ther structure we read from the beacon packet has
935 * the right values
936 */
937 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
938 *info_element, int sub_type)
939 {
940
941 if (info_element->qui_subtype != sub_type)
942 return -1;
943 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
944 return -1;
945 if (info_element->qui_type != QOS_OUI_TYPE)
946 return -1;
947 if (info_element->version != QOS_VERSION_1)
948 return -1;
949
950 return 0;
951 }
952
953 /*
954 * Parse a QoS parameter element
955 */
956 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
957 *element_param, struct ieee80211_info_element
958 *info_element)
959 {
960 int ret = 0;
961 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
962
963 if ((info_element == NULL) || (element_param == NULL))
964 return -1;
965
966 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
967 memcpy(element_param->info_element.qui, info_element->data,
968 info_element->len);
969 element_param->info_element.elementID = info_element->id;
970 element_param->info_element.length = info_element->len;
971 } else
972 ret = -1;
973 if (ret == 0)
974 ret = ieee80211_verify_qos_info(&element_param->info_element,
975 QOS_OUI_PARAM_SUB_TYPE);
976 return ret;
977 }
978
979 /*
980 * Parse a QoS information element
981 */
982 static int ieee80211_read_qos_info_element(struct
983 ieee80211_qos_information_element
984 *element_info, struct ieee80211_info_element
985 *info_element)
986 {
987 int ret = 0;
988 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
989
990 if (element_info == NULL)
991 return -1;
992 if (info_element == NULL)
993 return -1;
994
995 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
996 memcpy(element_info->qui, info_element->data,
997 info_element->len);
998 element_info->elementID = info_element->id;
999 element_info->length = info_element->len;
1000 } else
1001 ret = -1;
1002
1003 if (ret == 0)
1004 ret = ieee80211_verify_qos_info(element_info,
1005 QOS_OUI_INFO_SUB_TYPE);
1006 return ret;
1007 }
1008
1009 /*
1010 * Write QoS parameters from the ac parameters.
1011 */
1012 static int ieee80211_qos_convert_ac_to_parameters(struct
1013 ieee80211_qos_parameter_info
1014 *param_elm, struct
1015 ieee80211_qos_parameters
1016 *qos_param)
1017 {
1018 int rc = 0;
1019 int i;
1020 struct ieee80211_qos_ac_parameter *ac_params;
1021 u32 txop;
1022 u8 cw_min;
1023 u8 cw_max;
1024
1025 for (i = 0; i < QOS_QUEUE_NUM; i++) {
1026 ac_params = &(param_elm->ac_params_record[i]);
1027
1028 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
1029 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
1030
1031 cw_min = ac_params->ecw_min_max & 0x0F;
1032 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
1033
1034 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
1035 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
1036
1037 qos_param->flag[i] =
1038 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1039
1040 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
1041 qos_param->tx_op_limit[i] = (u16) txop;
1042 }
1043 return rc;
1044 }
1045
1046 /*
1047 * we have a generic data element which it may contain QoS information or
1048 * parameters element. check the information element length to decide
1049 * which type to read
1050 */
1051 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
1052 *info_element,
1053 struct ieee80211_network *network)
1054 {
1055 int rc = 0;
1056 struct ieee80211_qos_parameters *qos_param = NULL;
1057 struct ieee80211_qos_information_element qos_info_element;
1058
1059 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
1060
1061 if (rc == 0) {
1062 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1063 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1064 } else {
1065 struct ieee80211_qos_parameter_info param_element;
1066
1067 rc = ieee80211_read_qos_param_element(&param_element,
1068 info_element);
1069 if (rc == 0) {
1070 qos_param = &(network->qos_data.parameters);
1071 ieee80211_qos_convert_ac_to_parameters(&param_element,
1072 qos_param);
1073 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1074 network->qos_data.param_count =
1075 param_element.info_element.ac_info & 0x0F;
1076 }
1077 }
1078
1079 if (rc == 0) {
1080 IEEE80211_DEBUG_QOS("QoS is supported\n");
1081 network->qos_data.supported = 1;
1082 }
1083 return rc;
1084 }
1085
1086 #ifdef CONFIG_IEEE80211_DEBUG
1087 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1088
1089 static const char *get_info_element_string(u16 id)
1090 {
1091 switch (id) {
1092 MFIE_STRING(SSID);
1093 MFIE_STRING(RATES);
1094 MFIE_STRING(FH_SET);
1095 MFIE_STRING(DS_SET);
1096 MFIE_STRING(CF_SET);
1097 MFIE_STRING(TIM);
1098 MFIE_STRING(IBSS_SET);
1099 MFIE_STRING(COUNTRY);
1100 MFIE_STRING(HOP_PARAMS);
1101 MFIE_STRING(HOP_TABLE);
1102 MFIE_STRING(REQUEST);
1103 MFIE_STRING(CHALLENGE);
1104 MFIE_STRING(POWER_CONSTRAINT);
1105 MFIE_STRING(POWER_CAPABILITY);
1106 MFIE_STRING(TPC_REQUEST);
1107 MFIE_STRING(TPC_REPORT);
1108 MFIE_STRING(SUPP_CHANNELS);
1109 MFIE_STRING(CSA);
1110 MFIE_STRING(MEASURE_REQUEST);
1111 MFIE_STRING(MEASURE_REPORT);
1112 MFIE_STRING(QUIET);
1113 MFIE_STRING(IBSS_DFS);
1114 MFIE_STRING(ERP_INFO);
1115 MFIE_STRING(RSN);
1116 MFIE_STRING(RATES_EX);
1117 MFIE_STRING(GENERIC);
1118 MFIE_STRING(QOS_PARAMETER);
1119 default:
1120 return "UNKNOWN";
1121 }
1122 }
1123 #endif
1124
1125 static int ieee80211_parse_info_param(struct ieee80211_info_element
1126 *info_element, u16 length,
1127 struct ieee80211_network *network)
1128 {
1129 u8 i;
1130 #ifdef CONFIG_IEEE80211_DEBUG
1131 char rates_str[64];
1132 char *p;
1133 #endif
1134
1135 while (length >= sizeof(*info_element)) {
1136 if (sizeof(*info_element) + info_element->len > length) {
1137 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
1138 "info_element->len + 2 > left : "
1139 "info_element->len+2=%zd left=%d, id=%d.\n",
1140 info_element->len +
1141 sizeof(*info_element),
1142 length, info_element->id);
1143 /* We stop processing but don't return an error here
1144 * because some misbehaviour APs break this rule. ie.
1145 * Orinoco AP1000. */
1146 break;
1147 }
1148
1149 switch (info_element->id) {
1150 case MFIE_TYPE_SSID:
1151 if (ieee80211_is_empty_essid(info_element->data,
1152 info_element->len)) {
1153 network->flags |= NETWORK_EMPTY_ESSID;
1154 break;
1155 }
1156
1157 network->ssid_len = min(info_element->len,
1158 (u8) IW_ESSID_MAX_SIZE);
1159 memcpy(network->ssid, info_element->data,
1160 network->ssid_len);
1161 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1162 memset(network->ssid + network->ssid_len, 0,
1163 IW_ESSID_MAX_SIZE - network->ssid_len);
1164
1165 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1166 network->ssid, network->ssid_len);
1167 break;
1168
1169 case MFIE_TYPE_RATES:
1170 #ifdef CONFIG_IEEE80211_DEBUG
1171 p = rates_str;
1172 #endif
1173 network->rates_len = min(info_element->len,
1174 MAX_RATES_LENGTH);
1175 for (i = 0; i < network->rates_len; i++) {
1176 network->rates[i] = info_element->data[i];
1177 #ifdef CONFIG_IEEE80211_DEBUG
1178 p += snprintf(p, sizeof(rates_str) -
1179 (p - rates_str), "%02X ",
1180 network->rates[i]);
1181 #endif
1182 if (ieee80211_is_ofdm_rate
1183 (info_element->data[i])) {
1184 network->flags |= NETWORK_HAS_OFDM;
1185 if (info_element->data[i] &
1186 IEEE80211_BASIC_RATE_MASK)
1187 network->flags &=
1188 ~NETWORK_HAS_CCK;
1189 }
1190 }
1191
1192 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1193 rates_str, network->rates_len);
1194 break;
1195
1196 case MFIE_TYPE_RATES_EX:
1197 #ifdef CONFIG_IEEE80211_DEBUG
1198 p = rates_str;
1199 #endif
1200 network->rates_ex_len = min(info_element->len,
1201 MAX_RATES_EX_LENGTH);
1202 for (i = 0; i < network->rates_ex_len; i++) {
1203 network->rates_ex[i] = info_element->data[i];
1204 #ifdef CONFIG_IEEE80211_DEBUG
1205 p += snprintf(p, sizeof(rates_str) -
1206 (p - rates_str), "%02X ",
1207 network->rates[i]);
1208 #endif
1209 if (ieee80211_is_ofdm_rate
1210 (info_element->data[i])) {
1211 network->flags |= NETWORK_HAS_OFDM;
1212 if (info_element->data[i] &
1213 IEEE80211_BASIC_RATE_MASK)
1214 network->flags &=
1215 ~NETWORK_HAS_CCK;
1216 }
1217 }
1218
1219 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1220 rates_str, network->rates_ex_len);
1221 break;
1222
1223 case MFIE_TYPE_DS_SET:
1224 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1225 info_element->data[0]);
1226 network->channel = info_element->data[0];
1227 break;
1228
1229 case MFIE_TYPE_FH_SET:
1230 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1231 break;
1232
1233 case MFIE_TYPE_CF_SET:
1234 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1235 break;
1236
1237 case MFIE_TYPE_TIM:
1238 network->tim.tim_count = info_element->data[0];
1239 network->tim.tim_period = info_element->data[1];
1240 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1241 break;
1242
1243 case MFIE_TYPE_ERP_INFO:
1244 network->erp_value = info_element->data[0];
1245 network->flags |= NETWORK_HAS_ERP_VALUE;
1246 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1247 network->erp_value);
1248 break;
1249
1250 case MFIE_TYPE_IBSS_SET:
1251 network->atim_window = info_element->data[0];
1252 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1253 network->atim_window);
1254 break;
1255
1256 case MFIE_TYPE_CHALLENGE:
1257 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1258 break;
1259
1260 case MFIE_TYPE_GENERIC:
1261 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1262 info_element->len);
1263 if (!ieee80211_parse_qos_info_param_IE(info_element,
1264 network))
1265 break;
1266
1267 if (info_element->len >= 4 &&
1268 info_element->data[0] == 0x00 &&
1269 info_element->data[1] == 0x50 &&
1270 info_element->data[2] == 0xf2 &&
1271 info_element->data[3] == 0x01) {
1272 network->wpa_ie_len = min(info_element->len + 2,
1273 MAX_WPA_IE_LEN);
1274 memcpy(network->wpa_ie, info_element,
1275 network->wpa_ie_len);
1276 }
1277 break;
1278
1279 case MFIE_TYPE_RSN:
1280 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1281 info_element->len);
1282 network->rsn_ie_len = min(info_element->len + 2,
1283 MAX_WPA_IE_LEN);
1284 memcpy(network->rsn_ie, info_element,
1285 network->rsn_ie_len);
1286 break;
1287
1288 case MFIE_TYPE_QOS_PARAMETER:
1289 printk(KERN_ERR
1290 "QoS Error need to parse QOS_PARAMETER IE\n");
1291 break;
1292 /* 802.11h */
1293 case MFIE_TYPE_POWER_CONSTRAINT:
1294 network->power_constraint = info_element->data[0];
1295 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1296 break;
1297
1298 case MFIE_TYPE_CSA:
1299 network->power_constraint = info_element->data[0];
1300 network->flags |= NETWORK_HAS_CSA;
1301 break;
1302
1303 case MFIE_TYPE_QUIET:
1304 network->quiet.count = info_element->data[0];
1305 network->quiet.period = info_element->data[1];
1306 network->quiet.duration = info_element->data[2];
1307 network->quiet.offset = info_element->data[3];
1308 network->flags |= NETWORK_HAS_QUIET;
1309 break;
1310
1311 case MFIE_TYPE_IBSS_DFS:
1312 if (network->ibss_dfs)
1313 break;
1314 network->ibss_dfs = kmemdup(info_element->data,
1315 info_element->len,
1316 GFP_ATOMIC);
1317 if (!network->ibss_dfs)
1318 return 1;
1319 network->flags |= NETWORK_HAS_IBSS_DFS;
1320 break;
1321
1322 case MFIE_TYPE_TPC_REPORT:
1323 network->tpc_report.transmit_power =
1324 info_element->data[0];
1325 network->tpc_report.link_margin = info_element->data[1];
1326 network->flags |= NETWORK_HAS_TPC_REPORT;
1327 break;
1328
1329 default:
1330 IEEE80211_DEBUG_MGMT
1331 ("Unsupported info element: %s (%d)\n",
1332 get_info_element_string(info_element->id),
1333 info_element->id);
1334 break;
1335 }
1336
1337 length -= sizeof(*info_element) + info_element->len;
1338 info_element =
1339 (struct ieee80211_info_element *)&info_element->
1340 data[info_element->len];
1341 }
1342
1343 return 0;
1344 }
1345
1346 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1347 *frame, struct ieee80211_rx_stats *stats)
1348 {
1349 struct ieee80211_network network_resp = {
1350 .ibss_dfs = NULL,
1351 };
1352 struct ieee80211_network *network = &network_resp;
1353 struct net_device *dev = ieee->dev;
1354
1355 network->flags = 0;
1356 network->qos_data.active = 0;
1357 network->qos_data.supported = 0;
1358 network->qos_data.param_count = 0;
1359 network->qos_data.old_param_count = 0;
1360
1361 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1362 network->atim_window = le16_to_cpu(frame->aid);
1363 network->listen_interval = le16_to_cpu(frame->status);
1364 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1365 network->capability = le16_to_cpu(frame->capability);
1366 network->last_scanned = jiffies;
1367 network->rates_len = network->rates_ex_len = 0;
1368 network->last_associate = 0;
1369 network->ssid_len = 0;
1370 network->erp_value =
1371 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1372
1373 if (stats->freq == IEEE80211_52GHZ_BAND) {
1374 /* for A band (No DS info) */
1375 network->channel = stats->received_channel;
1376 } else
1377 network->flags |= NETWORK_HAS_CCK;
1378
1379 network->wpa_ie_len = 0;
1380 network->rsn_ie_len = 0;
1381
1382 if (ieee80211_parse_info_param
1383 (frame->info_element, stats->len - sizeof(*frame), network))
1384 return 1;
1385
1386 network->mode = 0;
1387 if (stats->freq == IEEE80211_52GHZ_BAND)
1388 network->mode = IEEE_A;
1389 else {
1390 if (network->flags & NETWORK_HAS_OFDM)
1391 network->mode |= IEEE_G;
1392 if (network->flags & NETWORK_HAS_CCK)
1393 network->mode |= IEEE_B;
1394 }
1395
1396 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1397 network->flags |= NETWORK_EMPTY_ESSID;
1398
1399 memcpy(&network->stats, stats, sizeof(network->stats));
1400
1401 if (ieee->handle_assoc_response != NULL)
1402 ieee->handle_assoc_response(dev, frame, network);
1403
1404 return 0;
1405 }
1406
1407 /***************************************************/
1408
1409 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1410 *beacon,
1411 struct ieee80211_network *network,
1412 struct ieee80211_rx_stats *stats)
1413 {
1414 network->qos_data.active = 0;
1415 network->qos_data.supported = 0;
1416 network->qos_data.param_count = 0;
1417 network->qos_data.old_param_count = 0;
1418
1419 /* Pull out fixed field data */
1420 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1421 network->capability = le16_to_cpu(beacon->capability);
1422 network->last_scanned = jiffies;
1423 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1424 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1425 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1426 /* Where to pull this? beacon->listen_interval; */
1427 network->listen_interval = 0x0A;
1428 network->rates_len = network->rates_ex_len = 0;
1429 network->last_associate = 0;
1430 network->ssid_len = 0;
1431 network->flags = 0;
1432 network->atim_window = 0;
1433 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1434 0x3 : 0x0;
1435
1436 if (stats->freq == IEEE80211_52GHZ_BAND) {
1437 /* for A band (No DS info) */
1438 network->channel = stats->received_channel;
1439 } else
1440 network->flags |= NETWORK_HAS_CCK;
1441
1442 network->wpa_ie_len = 0;
1443 network->rsn_ie_len = 0;
1444
1445 if (ieee80211_parse_info_param
1446 (beacon->info_element, stats->len - sizeof(*beacon), network))
1447 return 1;
1448
1449 network->mode = 0;
1450 if (stats->freq == IEEE80211_52GHZ_BAND)
1451 network->mode = IEEE_A;
1452 else {
1453 if (network->flags & NETWORK_HAS_OFDM)
1454 network->mode |= IEEE_G;
1455 if (network->flags & NETWORK_HAS_CCK)
1456 network->mode |= IEEE_B;
1457 }
1458
1459 if (network->mode == 0) {
1460 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1461 "network.\n",
1462 escape_essid(network->ssid,
1463 network->ssid_len),
1464 MAC_ARG(network->bssid));
1465 return 1;
1466 }
1467
1468 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1469 network->flags |= NETWORK_EMPTY_ESSID;
1470
1471 memcpy(&network->stats, stats, sizeof(network->stats));
1472
1473 return 0;
1474 }
1475
1476 static inline int is_same_network(struct ieee80211_network *src,
1477 struct ieee80211_network *dst)
1478 {
1479 /* A network is only a duplicate if the channel, BSSID, and ESSID
1480 * all match. We treat all <hidden> with the same BSSID and channel
1481 * as one network */
1482 return ((src->ssid_len == dst->ssid_len) &&
1483 (src->channel == dst->channel) &&
1484 !compare_ether_addr(src->bssid, dst->bssid) &&
1485 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1486 }
1487
1488 static void update_network(struct ieee80211_network *dst,
1489 struct ieee80211_network *src)
1490 {
1491 int qos_active;
1492 u8 old_param;
1493
1494 ieee80211_network_reset(dst);
1495 dst->ibss_dfs = src->ibss_dfs;
1496
1497 /* We only update the statistics if they were created by receiving
1498 * the network information on the actual channel the network is on.
1499 *
1500 * This keeps beacons received on neighbor channels from bringing
1501 * down the signal level of an AP. */
1502 if (dst->channel == src->stats.received_channel)
1503 memcpy(&dst->stats, &src->stats,
1504 sizeof(struct ieee80211_rx_stats));
1505 else
1506 IEEE80211_DEBUG_SCAN("Network " MAC_FMT " info received "
1507 "off channel (%d vs. %d)\n", MAC_ARG(src->bssid),
1508 dst->channel, src->stats.received_channel);
1509
1510 dst->capability = src->capability;
1511 memcpy(dst->rates, src->rates, src->rates_len);
1512 dst->rates_len = src->rates_len;
1513 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1514 dst->rates_ex_len = src->rates_ex_len;
1515
1516 dst->mode = src->mode;
1517 dst->flags = src->flags;
1518 dst->time_stamp[0] = src->time_stamp[0];
1519 dst->time_stamp[1] = src->time_stamp[1];
1520
1521 dst->beacon_interval = src->beacon_interval;
1522 dst->listen_interval = src->listen_interval;
1523 dst->atim_window = src->atim_window;
1524 dst->erp_value = src->erp_value;
1525 dst->tim = src->tim;
1526
1527 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1528 dst->wpa_ie_len = src->wpa_ie_len;
1529 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1530 dst->rsn_ie_len = src->rsn_ie_len;
1531
1532 dst->last_scanned = jiffies;
1533 qos_active = src->qos_data.active;
1534 old_param = dst->qos_data.old_param_count;
1535 if (dst->flags & NETWORK_HAS_QOS_MASK)
1536 memcpy(&dst->qos_data, &src->qos_data,
1537 sizeof(struct ieee80211_qos_data));
1538 else {
1539 dst->qos_data.supported = src->qos_data.supported;
1540 dst->qos_data.param_count = src->qos_data.param_count;
1541 }
1542
1543 if (dst->qos_data.supported == 1) {
1544 if (dst->ssid_len)
1545 IEEE80211_DEBUG_QOS
1546 ("QoS the network %s is QoS supported\n",
1547 dst->ssid);
1548 else
1549 IEEE80211_DEBUG_QOS
1550 ("QoS the network is QoS supported\n");
1551 }
1552 dst->qos_data.active = qos_active;
1553 dst->qos_data.old_param_count = old_param;
1554
1555 /* dst->last_associate is not overwritten */
1556 }
1557
1558 static inline int is_beacon(__le16 fc)
1559 {
1560 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1561 }
1562
1563 static void ieee80211_process_probe_response(struct ieee80211_device
1564 *ieee, struct
1565 ieee80211_probe_response
1566 *beacon, struct ieee80211_rx_stats
1567 *stats)
1568 {
1569 struct net_device *dev = ieee->dev;
1570 struct ieee80211_network network = {
1571 .ibss_dfs = NULL,
1572 };
1573 struct ieee80211_network *target;
1574 struct ieee80211_network *oldest = NULL;
1575 #ifdef CONFIG_IEEE80211_DEBUG
1576 struct ieee80211_info_element *info_element = beacon->info_element;
1577 #endif
1578 unsigned long flags;
1579
1580 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1581 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1582 escape_essid(info_element->data,
1583 info_element->len),
1584 MAC_ARG(beacon->header.addr3),
1585 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1586 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1587 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1588 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1589 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1590 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1591 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1592 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1593 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1594 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1595 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1596 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1597 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1598 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1599 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1600 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1601
1602 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1603 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1604 escape_essid(info_element->data,
1605 info_element->len),
1606 MAC_ARG(beacon->header.addr3),
1607 is_beacon(beacon->header.frame_ctl) ?
1608 "BEACON" : "PROBE RESPONSE");
1609 return;
1610 }
1611
1612 /* The network parsed correctly -- so now we scan our known networks
1613 * to see if we can find it in our list.
1614 *
1615 * NOTE: This search is definitely not optimized. Once its doing
1616 * the "right thing" we'll optimize it for efficiency if
1617 * necessary */
1618
1619 /* Search for this entry in the list and update it if it is
1620 * already there. */
1621
1622 spin_lock_irqsave(&ieee->lock, flags);
1623
1624 list_for_each_entry(target, &ieee->network_list, list) {
1625 if (is_same_network(target, &network))
1626 break;
1627
1628 if ((oldest == NULL) ||
1629 (target->last_scanned < oldest->last_scanned))
1630 oldest = target;
1631 }
1632
1633 /* If we didn't find a match, then get a new network slot to initialize
1634 * with this beacon's information */
1635 if (&target->list == &ieee->network_list) {
1636 if (list_empty(&ieee->network_free_list)) {
1637 /* If there are no more slots, expire the oldest */
1638 list_del(&oldest->list);
1639 target = oldest;
1640 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1641 "network list.\n",
1642 escape_essid(target->ssid,
1643 target->ssid_len),
1644 MAC_ARG(target->bssid));
1645 ieee80211_network_reset(target);
1646 } else {
1647 /* Otherwise just pull from the free list */
1648 target = list_entry(ieee->network_free_list.next,
1649 struct ieee80211_network, list);
1650 list_del(ieee->network_free_list.next);
1651 }
1652
1653 #ifdef CONFIG_IEEE80211_DEBUG
1654 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1655 escape_essid(network.ssid,
1656 network.ssid_len),
1657 MAC_ARG(network.bssid),
1658 is_beacon(beacon->header.frame_ctl) ?
1659 "BEACON" : "PROBE RESPONSE");
1660 #endif
1661 memcpy(target, &network, sizeof(*target));
1662 network.ibss_dfs = NULL;
1663 list_add_tail(&target->list, &ieee->network_list);
1664 } else {
1665 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1666 escape_essid(target->ssid,
1667 target->ssid_len),
1668 MAC_ARG(target->bssid),
1669 is_beacon(beacon->header.frame_ctl) ?
1670 "BEACON" : "PROBE RESPONSE");
1671 update_network(target, &network);
1672 network.ibss_dfs = NULL;
1673 }
1674
1675 spin_unlock_irqrestore(&ieee->lock, flags);
1676
1677 if (is_beacon(beacon->header.frame_ctl)) {
1678 if (ieee->handle_beacon != NULL)
1679 ieee->handle_beacon(dev, beacon, target);
1680 } else {
1681 if (ieee->handle_probe_response != NULL)
1682 ieee->handle_probe_response(dev, beacon, target);
1683 }
1684 }
1685
1686 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1687 struct ieee80211_hdr_4addr *header,
1688 struct ieee80211_rx_stats *stats)
1689 {
1690 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1691 case IEEE80211_STYPE_ASSOC_RESP:
1692 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1693 WLAN_FC_GET_STYPE(le16_to_cpu
1694 (header->frame_ctl)));
1695 ieee80211_handle_assoc_resp(ieee,
1696 (struct ieee80211_assoc_response *)
1697 header, stats);
1698 break;
1699
1700 case IEEE80211_STYPE_REASSOC_RESP:
1701 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1702 WLAN_FC_GET_STYPE(le16_to_cpu
1703 (header->frame_ctl)));
1704 break;
1705
1706 case IEEE80211_STYPE_PROBE_REQ:
1707 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1708 WLAN_FC_GET_STYPE(le16_to_cpu
1709 (header->frame_ctl)));
1710
1711 if (ieee->handle_probe_request != NULL)
1712 ieee->handle_probe_request(ieee->dev,
1713 (struct
1714 ieee80211_probe_request *)
1715 header, stats);
1716 break;
1717
1718 case IEEE80211_STYPE_PROBE_RESP:
1719 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1720 WLAN_FC_GET_STYPE(le16_to_cpu
1721 (header->frame_ctl)));
1722 IEEE80211_DEBUG_SCAN("Probe response\n");
1723 ieee80211_process_probe_response(ieee,
1724 (struct
1725 ieee80211_probe_response *)
1726 header, stats);
1727 break;
1728
1729 case IEEE80211_STYPE_BEACON:
1730 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1731 WLAN_FC_GET_STYPE(le16_to_cpu
1732 (header->frame_ctl)));
1733 IEEE80211_DEBUG_SCAN("Beacon\n");
1734 ieee80211_process_probe_response(ieee,
1735 (struct
1736 ieee80211_probe_response *)
1737 header, stats);
1738 break;
1739 case IEEE80211_STYPE_AUTH:
1740
1741 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1742 WLAN_FC_GET_STYPE(le16_to_cpu
1743 (header->frame_ctl)));
1744
1745 if (ieee->handle_auth != NULL)
1746 ieee->handle_auth(ieee->dev,
1747 (struct ieee80211_auth *)header);
1748 break;
1749
1750 case IEEE80211_STYPE_DISASSOC:
1751 if (ieee->handle_disassoc != NULL)
1752 ieee->handle_disassoc(ieee->dev,
1753 (struct ieee80211_disassoc *)
1754 header);
1755 break;
1756
1757 case IEEE80211_STYPE_ACTION:
1758 IEEE80211_DEBUG_MGMT("ACTION\n");
1759 if (ieee->handle_action)
1760 ieee->handle_action(ieee->dev,
1761 (struct ieee80211_action *)
1762 header, stats);
1763 break;
1764
1765 case IEEE80211_STYPE_REASSOC_REQ:
1766 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1767 WLAN_FC_GET_STYPE(le16_to_cpu
1768 (header->frame_ctl)));
1769
1770 IEEE80211_DEBUG_MGMT("%s: IEEE80211_REASSOC_REQ received\n",
1771 ieee->dev->name);
1772 if (ieee->handle_reassoc_request != NULL)
1773 ieee->handle_reassoc_request(ieee->dev,
1774 (struct ieee80211_reassoc_request *)
1775 header);
1776 break;
1777
1778 case IEEE80211_STYPE_ASSOC_REQ:
1779 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1780 WLAN_FC_GET_STYPE(le16_to_cpu
1781 (header->frame_ctl)));
1782
1783 IEEE80211_DEBUG_MGMT("%s: IEEE80211_ASSOC_REQ received\n",
1784 ieee->dev->name);
1785 if (ieee->handle_assoc_request != NULL)
1786 ieee->handle_assoc_request(ieee->dev);
1787 break;
1788
1789 case IEEE80211_STYPE_DEAUTH:
1790 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1791 if (ieee->handle_deauth != NULL)
1792 ieee->handle_deauth(ieee->dev,
1793 (struct ieee80211_deauth *)
1794 header);
1795 break;
1796 default:
1797 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1798 WLAN_FC_GET_STYPE(le16_to_cpu
1799 (header->frame_ctl)));
1800 IEEE80211_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1801 ieee->dev->name,
1802 WLAN_FC_GET_STYPE(le16_to_cpu
1803 (header->frame_ctl)));
1804 break;
1805 }
1806 }
1807
1808 EXPORT_SYMBOL_GPL(ieee80211_rx_any);
1809 EXPORT_SYMBOL(ieee80211_rx_mgt);
1810 EXPORT_SYMBOL(ieee80211_rx);
Linux kernel - Deliverables
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