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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / net / ieee80211 / ieee80211_rx.c
blobf2de2e48b021cc960417cd330f8e9a72a648cc5c
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 /* Put this code here so that we avoid duplicating it in all
370 * Rx paths. - Jean II */
371 #ifdef CONFIG_WIRELESS_EXT
372 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
373 /* If spy monitoring on */
374 if (ieee->spy_data.spy_number > 0) {
375 struct iw_quality wstats;
376
377 wstats.updated = 0;
378 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
379 wstats.level = rx_stats->rssi;
380 wstats.updated |= IW_QUAL_LEVEL_UPDATED;
381 } else
382 wstats.updated |= IW_QUAL_LEVEL_INVALID;
383
384 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
385 wstats.noise = rx_stats->noise;
386 wstats.updated |= IW_QUAL_NOISE_UPDATED;
387 } else
388 wstats.updated |= IW_QUAL_NOISE_INVALID;
389
390 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
391 wstats.qual = rx_stats->signal;
392 wstats.updated |= IW_QUAL_QUAL_UPDATED;
393 } else
394 wstats.updated |= IW_QUAL_QUAL_INVALID;
395
396 /* Update spy records */
397 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
398 }
399 #endif /* IW_WIRELESS_SPY */
400 #endif /* CONFIG_WIRELESS_EXT */
401
402 #ifdef NOT_YET
403 hostap_update_rx_stats(local->ap, hdr, rx_stats);
404 #endif
405
406 if (ieee->iw_mode == IW_MODE_MONITOR) {
407 stats->rx_packets++;
408 stats->rx_bytes += skb->len;
409 ieee80211_monitor_rx(ieee, skb, rx_stats);
410 return 1;
411 }
412
413 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
414 is_broadcast_ether_addr(hdr->addr2)) ?
415 ieee->host_mc_decrypt : ieee->host_decrypt;
416
417 if (can_be_decrypted) {
418 if (skb->len >= hdrlen + 3) {
419 /* Top two-bits of byte 3 are the key index */
420 keyidx = skb->data[hdrlen + 3] >> 6;
421 }
422
423 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx
424 * is only allowed 2-bits of storage, no value of keyidx can
425 * be provided via above code that would result in keyidx
426 * being out of range */
427 crypt = ieee->crypt[keyidx];
428
429 #ifdef NOT_YET
430 sta = NULL;
431
432 /* Use station specific key to override default keys if the
433 * receiver address is a unicast address ("individual RA"). If
434 * bcrx_sta_key parameter is set, station specific key is used
435 * even with broad/multicast targets (this is against IEEE
436 * 802.11, but makes it easier to use different keys with
437 * stations that do not support WEP key mapping). */
438
439 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
440 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
441 &sta);
442 #endif
443
444 /* allow NULL decrypt to indicate an station specific override
445 * for default encryption */
446 if (crypt && (crypt->ops == NULL ||
447 crypt->ops->decrypt_mpdu == NULL))
448 crypt = NULL;
449
450 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
451 /* This seems to be triggered by some (multicast?)
452 * frames from other than current BSS, so just drop the
453 * frames silently instead of filling system log with
454 * these reports. */
455 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
456 " (SA=" MAC_FMT ")\n",
457 MAC_ARG(hdr->addr2));
458 ieee->ieee_stats.rx_discards_undecryptable++;
459 goto rx_dropped;
460 }
461 }
462 #ifdef NOT_YET
463 if (type != WLAN_FC_TYPE_DATA) {
464 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
465 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
466 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
467 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
468 "from " MAC_FMT "\n", dev->name,
469 MAC_ARG(hdr->addr2));
470 /* TODO: could inform hostapd about this so that it
471 * could send auth failure report */
472 goto rx_dropped;
473 }
474
475 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
476 goto rx_dropped;
477 else
478 goto rx_exit;
479 }
480 #endif
481 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
482 if (sc == ieee->prev_seq_ctl)
483 goto rx_dropped;
484 else
485 ieee->prev_seq_ctl = sc;
486
487 /* Data frame - extract src/dst addresses */
488 if (skb->len < IEEE80211_3ADDR_LEN)
489 goto rx_dropped;
490
491 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
492 case IEEE80211_FCTL_FROMDS:
493 memcpy(dst, hdr->addr1, ETH_ALEN);
494 memcpy(src, hdr->addr3, ETH_ALEN);
495 break;
496 case IEEE80211_FCTL_TODS:
497 memcpy(dst, hdr->addr3, ETH_ALEN);
498 memcpy(src, hdr->addr2, ETH_ALEN);
499 break;
500 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
501 if (skb->len < IEEE80211_4ADDR_LEN)
502 goto rx_dropped;
503 memcpy(dst, hdr->addr3, ETH_ALEN);
504 memcpy(src, hdr->addr4, ETH_ALEN);
505 break;
506 case 0:
507 memcpy(dst, hdr->addr1, ETH_ALEN);
508 memcpy(src, hdr->addr2, ETH_ALEN);
509 break;
510 }
511
512 #ifdef NOT_YET
513 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
514 goto rx_dropped;
515 if (wds) {
516 skb->dev = dev = wds;
517 stats = hostap_get_stats(dev);
518 }
519
520 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
521 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
522 IEEE80211_FCTL_FROMDS && ieee->stadev
523 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
524 /* Frame from BSSID of the AP for which we are a client */
525 skb->dev = dev = ieee->stadev;
526 stats = hostap_get_stats(dev);
527 from_assoc_ap = 1;
528 }
529 #endif
530
531 dev->last_rx = jiffies;
532
533 #ifdef NOT_YET
534 if ((ieee->iw_mode == IW_MODE_MASTER ||
535 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
536 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
537 wds != NULL)) {
538 case AP_RX_CONTINUE_NOT_AUTHORIZED:
539 frame_authorized = 0;
540 break;
541 case AP_RX_CONTINUE:
542 frame_authorized = 1;
543 break;
544 case AP_RX_DROP:
545 goto rx_dropped;
546 case AP_RX_EXIT:
547 goto rx_exit;
548 }
549 }
550 #endif
551
552 /* Nullfunc frames may have PS-bit set, so they must be passed to
553 * hostap_handle_sta_rx() before being dropped here. */
554
555 stype &= ~IEEE80211_STYPE_QOS_DATA;
556
557 if (stype != IEEE80211_STYPE_DATA &&
558 stype != IEEE80211_STYPE_DATA_CFACK &&
559 stype != IEEE80211_STYPE_DATA_CFPOLL &&
560 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
561 if (stype != IEEE80211_STYPE_NULLFUNC)
562 IEEE80211_DEBUG_DROP("RX: dropped data frame "
563 "with no data (type=0x%02x, "
564 "subtype=0x%02x, len=%d)\n",
565 type, stype, skb->len);
566 goto rx_dropped;
567 }
568
569 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
570
571 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
572 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
573 goto rx_dropped;
574
575 hdr = (struct ieee80211_hdr_4addr *)skb->data;
576
577 /* skb: hdr + (possibly fragmented) plaintext payload */
578 // PR: FIXME: hostap has additional conditions in the "if" below:
579 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
580 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
581 int flen;
582 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
583 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
584
585 if (!frag_skb) {
586 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
587 "Rx cannot get skb from fragment "
588 "cache (morefrag=%d seq=%u frag=%u)\n",
589 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
590 WLAN_GET_SEQ_SEQ(sc), frag);
591 goto rx_dropped;
592 }
593
594 flen = skb->len;
595 if (frag != 0)
596 flen -= hdrlen;
597
598 if (frag_skb->tail + flen > frag_skb->end) {
599 printk(KERN_WARNING "%s: host decrypted and "
600 "reassembled frame did not fit skb\n",
601 dev->name);
602 ieee80211_frag_cache_invalidate(ieee, hdr);
603 goto rx_dropped;
604 }
605
606 if (frag == 0) {
607 /* copy first fragment (including full headers) into
608 * beginning of the fragment cache skb */
609 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);
610 } else {
611 /* append frame payload to the end of the fragment
612 * cache skb */
613 skb_copy_from_linear_data_offset(skb, hdrlen,
614 skb_put(frag_skb, flen), flen);
615 }
616 dev_kfree_skb_any(skb);
617 skb = NULL;
618
619 if (fc & IEEE80211_FCTL_MOREFRAGS) {
620 /* more fragments expected - leave the skb in fragment
621 * cache for now; it will be delivered to upper layers
622 * after all fragments have been received */
623 goto rx_exit;
624 }
625
626 /* this was the last fragment and the frame will be
627 * delivered, so remove skb from fragment cache */
628 skb = frag_skb;
629 hdr = (struct ieee80211_hdr_4addr *)skb->data;
630 ieee80211_frag_cache_invalidate(ieee, hdr);
631 }
632
633 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
634 * encrypted/authenticated */
635 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
636 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
637 goto rx_dropped;
638
639 hdr = (struct ieee80211_hdr_4addr *)skb->data;
640 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
641 if ( /*ieee->ieee802_1x && */
642 ieee80211_is_eapol_frame(ieee, skb)) {
643 /* pass unencrypted EAPOL frames even if encryption is
644 * configured */
645 } else {
646 IEEE80211_DEBUG_DROP("encryption configured, but RX "
647 "frame not encrypted (SA=" MAC_FMT
648 ")\n", MAC_ARG(hdr->addr2));
649 goto rx_dropped;
650 }
651 }
652
653 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
654 !ieee80211_is_eapol_frame(ieee, skb)) {
655 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
656 "frame from " MAC_FMT
657 " (drop_unencrypted=1)\n",
658 MAC_ARG(hdr->addr2));
659 goto rx_dropped;
660 }
661
662 /* If the frame was decrypted in hardware, we may need to strip off
663 * any security data (IV, ICV, etc) that was left behind */
664 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&
665 ieee->host_strip_iv_icv) {
666 int trimlen = 0;
667
668 /* Top two-bits of byte 3 are the key index */
669 if (skb->len >= hdrlen + 3)
670 keyidx = skb->data[hdrlen + 3] >> 6;
671
672 /* To strip off any security data which appears before the
673 * payload, we simply increase hdrlen (as the header gets
674 * chopped off immediately below). For the security data which
675 * appears after the payload, we use skb_trim. */
676
677 switch (ieee->sec.encode_alg[keyidx]) {
678 case SEC_ALG_WEP:
679 /* 4 byte IV */
680 hdrlen += 4;
681 /* 4 byte ICV */
682 trimlen = 4;
683 break;
684 case SEC_ALG_TKIP:
685 /* 4 byte IV, 4 byte ExtIV */
686 hdrlen += 8;
687 /* 8 byte MIC, 4 byte ICV */
688 trimlen = 12;
689 break;
690 case SEC_ALG_CCMP:
691 /* 8 byte CCMP header */
692 hdrlen += 8;
693 /* 8 byte MIC */
694 trimlen = 8;
695 break;
696 }
697
698 if (skb->len < trimlen)
699 goto rx_dropped;
700
701 __skb_trim(skb, skb->len - trimlen);
702
703 if (skb->len < hdrlen)
704 goto rx_dropped;
705 }
706
707 /* skb: hdr + (possible reassembled) full plaintext payload */
708
709 payload = skb->data + hdrlen;
710 ethertype = (payload[6] << 8) | payload[7];
711
712 #ifdef NOT_YET
713 /* If IEEE 802.1X is used, check whether the port is authorized to send
714 * the received frame. */
715 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
716 if (ethertype == ETH_P_PAE) {
717 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
718 dev->name);
719 if (ieee->hostapd && ieee->apdev) {
720 /* Send IEEE 802.1X frames to the user
721 * space daemon for processing */
722 prism2_rx_80211(ieee->apdev, skb, rx_stats,
723 PRISM2_RX_MGMT);
724 ieee->apdevstats.rx_packets++;
725 ieee->apdevstats.rx_bytes += skb->len;
726 goto rx_exit;
727 }
728 } else if (!frame_authorized) {
729 printk(KERN_DEBUG "%s: dropped frame from "
730 "unauthorized port (IEEE 802.1X): "
731 "ethertype=0x%04x\n", dev->name, ethertype);
732 goto rx_dropped;
733 }
734 }
735 #endif
736
737 /* convert hdr + possible LLC headers into Ethernet header */
738 if (skb->len - hdrlen >= 8 &&
739 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
740 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
741 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
742 /* remove RFC1042 or Bridge-Tunnel encapsulation and
743 * replace EtherType */
744 skb_pull(skb, hdrlen + SNAP_SIZE);
745 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
746 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
747 } else {
748 u16 len;
749 /* Leave Ethernet header part of hdr and full payload */
750 skb_pull(skb, hdrlen);
751 len = htons(skb->len);
752 memcpy(skb_push(skb, 2), &len, 2);
753 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
754 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
755 }
756
757 #ifdef NOT_YET
758 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
759 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
760 /* Non-standard frame: get addr4 from its bogus location after
761 * the payload */
762 skb_copy_to_linear_data_offset(skb, ETH_ALEN,
763 skb->data + skb->len - ETH_ALEN,
764 ETH_ALEN);
765 skb_trim(skb, skb->len - ETH_ALEN);
766 }
767 #endif
768
769 stats->rx_packets++;
770 stats->rx_bytes += skb->len;
771
772 #ifdef NOT_YET
773 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
774 if (dst[0] & 0x01) {
775 /* copy multicast frame both to the higher layers and
776 * to the wireless media */
777 ieee->ap->bridged_multicast++;
778 skb2 = skb_clone(skb, GFP_ATOMIC);
779 if (skb2 == NULL)
780 printk(KERN_DEBUG "%s: skb_clone failed for "
781 "multicast frame\n", dev->name);
782 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
783 /* send frame directly to the associated STA using
784 * wireless media and not passing to higher layers */
785 ieee->ap->bridged_unicast++;
786 skb2 = skb;
787 skb = NULL;
788 }
789 }
790
791 if (skb2 != NULL) {
792 /* send to wireless media */
793 skb2->dev = dev;
794 skb2->protocol = __constant_htons(ETH_P_802_3);
795 skb_reset_mac_header(skb2);
796 skb_reset_network_header(skb2);
797 /* skb2->network_header += ETH_HLEN; */
798 dev_queue_xmit(skb2);
799 }
800 #endif
801
802 if (skb) {
803 skb->protocol = eth_type_trans(skb, dev);
804 memset(skb->cb, 0, sizeof(skb->cb));
805 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
806 if (netif_rx(skb) == NET_RX_DROP) {
807 /* netif_rx always succeeds, but it might drop
808 * the packet. If it drops the packet, we log that
809 * in our stats. */
810 IEEE80211_DEBUG_DROP
811 ("RX: netif_rx dropped the packet\n");
812 stats->rx_dropped++;
813 }
814 }
815
816 rx_exit:
817 #ifdef NOT_YET
818 if (sta)
819 hostap_handle_sta_release(sta);
820 #endif
821 return 1;
822
823 rx_dropped:
824 stats->rx_dropped++;
825
826 /* Returning 0 indicates to caller that we have not handled the SKB--
827 * so it is still allocated and can be used again by underlying
828 * hardware as a DMA target */
829 return 0;
830 }
831
832 /* Filter out unrelated packets, call ieee80211_rx[_mgt]
833 * This function takes over the skb, it should not be used again after calling
834 * this function. */
835 void ieee80211_rx_any(struct ieee80211_device *ieee,
836 struct sk_buff *skb, struct ieee80211_rx_stats *stats)
837 {
838 struct ieee80211_hdr_4addr *hdr;
839 int is_packet_for_us;
840 u16 fc;
841
842 if (ieee->iw_mode == IW_MODE_MONITOR) {
843 if (!ieee80211_rx(ieee, skb, stats))
844 dev_kfree_skb_irq(skb);
845 return;
846 }
847
848 if (skb->len < sizeof(struct ieee80211_hdr))
849 goto drop_free;
850
851 hdr = (struct ieee80211_hdr_4addr *)skb->data;
852 fc = le16_to_cpu(hdr->frame_ctl);
853
854 if ((fc & IEEE80211_FCTL_VERS) != 0)
855 goto drop_free;
856
857 switch (fc & IEEE80211_FCTL_FTYPE) {
858 case IEEE80211_FTYPE_MGMT:
859 if (skb->len < sizeof(struct ieee80211_hdr_3addr))
860 goto drop_free;
861 ieee80211_rx_mgt(ieee, hdr, stats);
862 dev_kfree_skb_irq(skb);
863 return;
864 case IEEE80211_FTYPE_DATA:
865 break;
866 case IEEE80211_FTYPE_CTL:
867 return;
868 default:
869 return;
870 }
871
872 is_packet_for_us = 0;
873 switch (ieee->iw_mode) {
874 case IW_MODE_ADHOC:
875 /* our BSS and not from/to DS */
876 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
877 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
878 /* promisc: get all */
879 if (ieee->dev->flags & IFF_PROMISC)
880 is_packet_for_us = 1;
881 /* to us */
882 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
883 is_packet_for_us = 1;
884 /* mcast */
885 else if (is_multicast_ether_addr(hdr->addr1))
886 is_packet_for_us = 1;
887 }
888 break;
889 case IW_MODE_INFRA:
890 /* our BSS (== from our AP) and from DS */
891 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
892 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
893 /* promisc: get all */
894 if (ieee->dev->flags & IFF_PROMISC)
895 is_packet_for_us = 1;
896 /* to us */
897 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
898 is_packet_for_us = 1;
899 /* mcast */
900 else if (is_multicast_ether_addr(hdr->addr1)) {
901 /* not our own packet bcasted from AP */
902 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
903 is_packet_for_us = 1;
904 }
905 }
906 break;
907 default:
908 /* ? */
909 break;
910 }
911
912 if (is_packet_for_us)
913 if (!ieee80211_rx(ieee, skb, stats))
914 dev_kfree_skb_irq(skb);
915 return;
916
917 drop_free:
918 dev_kfree_skb_irq(skb);
919 ieee->stats.rx_dropped++;
920 return;
921 }
922
923 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
924
925 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
926
927 /*
928 * Make ther structure we read from the beacon packet has
929 * the right values
930 */
931 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
932 *info_element, int sub_type)
933 {
934
935 if (info_element->qui_subtype != sub_type)
936 return -1;
937 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
938 return -1;
939 if (info_element->qui_type != QOS_OUI_TYPE)
940 return -1;
941 if (info_element->version != QOS_VERSION_1)
942 return -1;
943
944 return 0;
945 }
946
947 /*
948 * Parse a QoS parameter element
949 */
950 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
951 *element_param, struct ieee80211_info_element
952 *info_element)
953 {
954 int ret = 0;
955 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
956
957 if ((info_element == NULL) || (element_param == NULL))
958 return -1;
959
960 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
961 memcpy(element_param->info_element.qui, info_element->data,
962 info_element->len);
963 element_param->info_element.elementID = info_element->id;
964 element_param->info_element.length = info_element->len;
965 } else
966 ret = -1;
967 if (ret == 0)
968 ret = ieee80211_verify_qos_info(&element_param->info_element,
969 QOS_OUI_PARAM_SUB_TYPE);
970 return ret;
971 }
972
973 /*
974 * Parse a QoS information element
975 */
976 static int ieee80211_read_qos_info_element(struct
977 ieee80211_qos_information_element
978 *element_info, struct ieee80211_info_element
979 *info_element)
980 {
981 int ret = 0;
982 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
983
984 if (element_info == NULL)
985 return -1;
986 if (info_element == NULL)
987 return -1;
988
989 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
990 memcpy(element_info->qui, info_element->data,
991 info_element->len);
992 element_info->elementID = info_element->id;
993 element_info->length = info_element->len;
994 } else
995 ret = -1;
996
997 if (ret == 0)
998 ret = ieee80211_verify_qos_info(element_info,
999 QOS_OUI_INFO_SUB_TYPE);
1000 return ret;
1001 }
1002
1003 /*
1004 * Write QoS parameters from the ac parameters.
1005 */
1006 static int ieee80211_qos_convert_ac_to_parameters(struct
1007 ieee80211_qos_parameter_info
1008 *param_elm, struct
1009 ieee80211_qos_parameters
1010 *qos_param)
1011 {
1012 int rc = 0;
1013 int i;
1014 struct ieee80211_qos_ac_parameter *ac_params;
1015 u32 txop;
1016 u8 cw_min;
1017 u8 cw_max;
1018
1019 for (i = 0; i < QOS_QUEUE_NUM; i++) {
1020 ac_params = &(param_elm->ac_params_record[i]);
1021
1022 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
1023 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
1024
1025 cw_min = ac_params->ecw_min_max & 0x0F;
1026 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
1027
1028 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
1029 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
1030
1031 qos_param->flag[i] =
1032 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1033
1034 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
1035 qos_param->tx_op_limit[i] = (u16) txop;
1036 }
1037 return rc;
1038 }
1039
1040 /*
1041 * we have a generic data element which it may contain QoS information or
1042 * parameters element. check the information element length to decide
1043 * which type to read
1044 */
1045 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
1046 *info_element,
1047 struct ieee80211_network *network)
1048 {
1049 int rc = 0;
1050 struct ieee80211_qos_parameters *qos_param = NULL;
1051 struct ieee80211_qos_information_element qos_info_element;
1052
1053 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
1054
1055 if (rc == 0) {
1056 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1057 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1058 } else {
1059 struct ieee80211_qos_parameter_info param_element;
1060
1061 rc = ieee80211_read_qos_param_element(&param_element,
1062 info_element);
1063 if (rc == 0) {
1064 qos_param = &(network->qos_data.parameters);
1065 ieee80211_qos_convert_ac_to_parameters(&param_element,
1066 qos_param);
1067 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1068 network->qos_data.param_count =
1069 param_element.info_element.ac_info & 0x0F;
1070 }
1071 }
1072
1073 if (rc == 0) {
1074 IEEE80211_DEBUG_QOS("QoS is supported\n");
1075 network->qos_data.supported = 1;
1076 }
1077 return rc;
1078 }
1079
1080 #ifdef CONFIG_IEEE80211_DEBUG
1081 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1082
1083 static const char *get_info_element_string(u16 id)
1084 {
1085 switch (id) {
1086 MFIE_STRING(SSID);
1087 MFIE_STRING(RATES);
1088 MFIE_STRING(FH_SET);
1089 MFIE_STRING(DS_SET);
1090 MFIE_STRING(CF_SET);
1091 MFIE_STRING(TIM);
1092 MFIE_STRING(IBSS_SET);
1093 MFIE_STRING(COUNTRY);
1094 MFIE_STRING(HOP_PARAMS);
1095 MFIE_STRING(HOP_TABLE);
1096 MFIE_STRING(REQUEST);
1097 MFIE_STRING(CHALLENGE);
1098 MFIE_STRING(POWER_CONSTRAINT);
1099 MFIE_STRING(POWER_CAPABILITY);
1100 MFIE_STRING(TPC_REQUEST);
1101 MFIE_STRING(TPC_REPORT);
1102 MFIE_STRING(SUPP_CHANNELS);
1103 MFIE_STRING(CSA);
1104 MFIE_STRING(MEASURE_REQUEST);
1105 MFIE_STRING(MEASURE_REPORT);
1106 MFIE_STRING(QUIET);
1107 MFIE_STRING(IBSS_DFS);
1108 MFIE_STRING(ERP_INFO);
1109 MFIE_STRING(RSN);
1110 MFIE_STRING(RATES_EX);
1111 MFIE_STRING(GENERIC);
1112 MFIE_STRING(QOS_PARAMETER);
1113 default:
1114 return "UNKNOWN";
1115 }
1116 }
1117 #endif
1118
1119 static int ieee80211_parse_info_param(struct ieee80211_info_element
1120 *info_element, u16 length,
1121 struct ieee80211_network *network)
1122 {
1123 u8 i;
1124 #ifdef CONFIG_IEEE80211_DEBUG
1125 char rates_str[64];
1126 char *p;
1127 #endif
1128
1129 while (length >= sizeof(*info_element)) {
1130 if (sizeof(*info_element) + info_element->len > length) {
1131 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
1132 "info_element->len + 2 > left : "
1133 "info_element->len+2=%zd left=%d, id=%d.\n",
1134 info_element->len +
1135 sizeof(*info_element),
1136 length, info_element->id);
1137 /* We stop processing but don't return an error here
1138 * because some misbehaviour APs break this rule. ie.
1139 * Orinoco AP1000. */
1140 break;
1141 }
1142
1143 switch (info_element->id) {
1144 case MFIE_TYPE_SSID:
1145 if (ieee80211_is_empty_essid(info_element->data,
1146 info_element->len)) {
1147 network->flags |= NETWORK_EMPTY_ESSID;
1148 break;
1149 }
1150
1151 network->ssid_len = min(info_element->len,
1152 (u8) IW_ESSID_MAX_SIZE);
1153 memcpy(network->ssid, info_element->data,
1154 network->ssid_len);
1155 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1156 memset(network->ssid + network->ssid_len, 0,
1157 IW_ESSID_MAX_SIZE - network->ssid_len);
1158
1159 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1160 network->ssid, network->ssid_len);
1161 break;
1162
1163 case MFIE_TYPE_RATES:
1164 #ifdef CONFIG_IEEE80211_DEBUG
1165 p = rates_str;
1166 #endif
1167 network->rates_len = min(info_element->len,
1168 MAX_RATES_LENGTH);
1169 for (i = 0; i < network->rates_len; i++) {
1170 network->rates[i] = info_element->data[i];
1171 #ifdef CONFIG_IEEE80211_DEBUG
1172 p += snprintf(p, sizeof(rates_str) -
1173 (p - rates_str), "%02X ",
1174 network->rates[i]);
1175 #endif
1176 if (ieee80211_is_ofdm_rate
1177 (info_element->data[i])) {
1178 network->flags |= NETWORK_HAS_OFDM;
1179 if (info_element->data[i] &
1180 IEEE80211_BASIC_RATE_MASK)
1181 network->flags &=
1182 ~NETWORK_HAS_CCK;
1183 }
1184 }
1185
1186 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1187 rates_str, network->rates_len);
1188 break;
1189
1190 case MFIE_TYPE_RATES_EX:
1191 #ifdef CONFIG_IEEE80211_DEBUG
1192 p = rates_str;
1193 #endif
1194 network->rates_ex_len = min(info_element->len,
1195 MAX_RATES_EX_LENGTH);
1196 for (i = 0; i < network->rates_ex_len; i++) {
1197 network->rates_ex[i] = info_element->data[i];
1198 #ifdef CONFIG_IEEE80211_DEBUG
1199 p += snprintf(p, sizeof(rates_str) -
1200 (p - rates_str), "%02X ",
1201 network->rates[i]);
1202 #endif
1203 if (ieee80211_is_ofdm_rate
1204 (info_element->data[i])) {
1205 network->flags |= NETWORK_HAS_OFDM;
1206 if (info_element->data[i] &
1207 IEEE80211_BASIC_RATE_MASK)
1208 network->flags &=
1209 ~NETWORK_HAS_CCK;
1210 }
1211 }
1212
1213 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1214 rates_str, network->rates_ex_len);
1215 break;
1216
1217 case MFIE_TYPE_DS_SET:
1218 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1219 info_element->data[0]);
1220 network->channel = info_element->data[0];
1221 break;
1222
1223 case MFIE_TYPE_FH_SET:
1224 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1225 break;
1226
1227 case MFIE_TYPE_CF_SET:
1228 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1229 break;
1230
1231 case MFIE_TYPE_TIM:
1232 network->tim.tim_count = info_element->data[0];
1233 network->tim.tim_period = info_element->data[1];
1234 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1235 break;
1236
1237 case MFIE_TYPE_ERP_INFO:
1238 network->erp_value = info_element->data[0];
1239 network->flags |= NETWORK_HAS_ERP_VALUE;
1240 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1241 network->erp_value);
1242 break;
1243
1244 case MFIE_TYPE_IBSS_SET:
1245 network->atim_window = info_element->data[0];
1246 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1247 network->atim_window);
1248 break;
1249
1250 case MFIE_TYPE_CHALLENGE:
1251 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1252 break;
1253
1254 case MFIE_TYPE_GENERIC:
1255 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1256 info_element->len);
1257 if (!ieee80211_parse_qos_info_param_IE(info_element,
1258 network))
1259 break;
1260
1261 if (info_element->len >= 4 &&
1262 info_element->data[0] == 0x00 &&
1263 info_element->data[1] == 0x50 &&
1264 info_element->data[2] == 0xf2 &&
1265 info_element->data[3] == 0x01) {
1266 network->wpa_ie_len = min(info_element->len + 2,
1267 MAX_WPA_IE_LEN);
1268 memcpy(network->wpa_ie, info_element,
1269 network->wpa_ie_len);
1270 }
1271 break;
1272
1273 case MFIE_TYPE_RSN:
1274 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1275 info_element->len);
1276 network->rsn_ie_len = min(info_element->len + 2,
1277 MAX_WPA_IE_LEN);
1278 memcpy(network->rsn_ie, info_element,
1279 network->rsn_ie_len);
1280 break;
1281
1282 case MFIE_TYPE_QOS_PARAMETER:
1283 printk(KERN_ERR
1284 "QoS Error need to parse QOS_PARAMETER IE\n");
1285 break;
1286 /* 802.11h */
1287 case MFIE_TYPE_POWER_CONSTRAINT:
1288 network->power_constraint = info_element->data[0];
1289 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1290 break;
1291
1292 case MFIE_TYPE_CSA:
1293 network->power_constraint = info_element->data[0];
1294 network->flags |= NETWORK_HAS_CSA;
1295 break;
1296
1297 case MFIE_TYPE_QUIET:
1298 network->quiet.count = info_element->data[0];
1299 network->quiet.period = info_element->data[1];
1300 network->quiet.duration = info_element->data[2];
1301 network->quiet.offset = info_element->data[3];
1302 network->flags |= NETWORK_HAS_QUIET;
1303 break;
1304
1305 case MFIE_TYPE_IBSS_DFS:
1306 if (network->ibss_dfs)
1307 break;
1308 network->ibss_dfs = kmemdup(info_element->data,
1309 info_element->len,
1310 GFP_ATOMIC);
1311 if (!network->ibss_dfs)
1312 return 1;
1313 network->flags |= NETWORK_HAS_IBSS_DFS;
1314 break;
1315
1316 case MFIE_TYPE_TPC_REPORT:
1317 network->tpc_report.transmit_power =
1318 info_element->data[0];
1319 network->tpc_report.link_margin = info_element->data[1];
1320 network->flags |= NETWORK_HAS_TPC_REPORT;
1321 break;
1322
1323 default:
1324 IEEE80211_DEBUG_MGMT
1325 ("Unsupported info element: %s (%d)\n",
1326 get_info_element_string(info_element->id),
1327 info_element->id);
1328 break;
1329 }
1330
1331 length -= sizeof(*info_element) + info_element->len;
1332 info_element =
1333 (struct ieee80211_info_element *)&info_element->
1334 data[info_element->len];
1335 }
1336
1337 return 0;
1338 }
1339
1340 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1341 *frame, struct ieee80211_rx_stats *stats)
1342 {
1343 struct ieee80211_network network_resp = {
1344 .ibss_dfs = NULL,
1345 };
1346 struct ieee80211_network *network = &network_resp;
1347 struct net_device *dev = ieee->dev;
1348
1349 network->flags = 0;
1350 network->qos_data.active = 0;
1351 network->qos_data.supported = 0;
1352 network->qos_data.param_count = 0;
1353 network->qos_data.old_param_count = 0;
1354
1355 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1356 network->atim_window = le16_to_cpu(frame->aid);
1357 network->listen_interval = le16_to_cpu(frame->status);
1358 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1359 network->capability = le16_to_cpu(frame->capability);
1360 network->last_scanned = jiffies;
1361 network->rates_len = network->rates_ex_len = 0;
1362 network->last_associate = 0;
1363 network->ssid_len = 0;
1364 network->erp_value =
1365 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1366
1367 if (stats->freq == IEEE80211_52GHZ_BAND) {
1368 /* for A band (No DS info) */
1369 network->channel = stats->received_channel;
1370 } else
1371 network->flags |= NETWORK_HAS_CCK;
1372
1373 network->wpa_ie_len = 0;
1374 network->rsn_ie_len = 0;
1375
1376 if (ieee80211_parse_info_param
1377 (frame->info_element, stats->len - sizeof(*frame), network))
1378 return 1;
1379
1380 network->mode = 0;
1381 if (stats->freq == IEEE80211_52GHZ_BAND)
1382 network->mode = IEEE_A;
1383 else {
1384 if (network->flags & NETWORK_HAS_OFDM)
1385 network->mode |= IEEE_G;
1386 if (network->flags & NETWORK_HAS_CCK)
1387 network->mode |= IEEE_B;
1388 }
1389
1390 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1391 network->flags |= NETWORK_EMPTY_ESSID;
1392
1393 memcpy(&network->stats, stats, sizeof(network->stats));
1394
1395 if (ieee->handle_assoc_response != NULL)
1396 ieee->handle_assoc_response(dev, frame, network);
1397
1398 return 0;
1399 }
1400
1401 /***************************************************/
1402
1403 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1404 *beacon,
1405 struct ieee80211_network *network,
1406 struct ieee80211_rx_stats *stats)
1407 {
1408 network->qos_data.active = 0;
1409 network->qos_data.supported = 0;
1410 network->qos_data.param_count = 0;
1411 network->qos_data.old_param_count = 0;
1412
1413 /* Pull out fixed field data */
1414 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1415 network->capability = le16_to_cpu(beacon->capability);
1416 network->last_scanned = jiffies;
1417 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1418 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1419 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1420 /* Where to pull this? beacon->listen_interval; */
1421 network->listen_interval = 0x0A;
1422 network->rates_len = network->rates_ex_len = 0;
1423 network->last_associate = 0;
1424 network->ssid_len = 0;
1425 network->flags = 0;
1426 network->atim_window = 0;
1427 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1428 0x3 : 0x0;
1429
1430 if (stats->freq == IEEE80211_52GHZ_BAND) {
1431 /* for A band (No DS info) */
1432 network->channel = stats->received_channel;
1433 } else
1434 network->flags |= NETWORK_HAS_CCK;
1435
1436 network->wpa_ie_len = 0;
1437 network->rsn_ie_len = 0;
1438
1439 if (ieee80211_parse_info_param
1440 (beacon->info_element, stats->len - sizeof(*beacon), network))
1441 return 1;
1442
1443 network->mode = 0;
1444 if (stats->freq == IEEE80211_52GHZ_BAND)
1445 network->mode = IEEE_A;
1446 else {
1447 if (network->flags & NETWORK_HAS_OFDM)
1448 network->mode |= IEEE_G;
1449 if (network->flags & NETWORK_HAS_CCK)
1450 network->mode |= IEEE_B;
1451 }
1452
1453 if (network->mode == 0) {
1454 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1455 "network.\n",
1456 escape_essid(network->ssid,
1457 network->ssid_len),
1458 MAC_ARG(network->bssid));
1459 return 1;
1460 }
1461
1462 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1463 network->flags |= NETWORK_EMPTY_ESSID;
1464
1465 memcpy(&network->stats, stats, sizeof(network->stats));
1466
1467 return 0;
1468 }
1469
1470 static inline int is_same_network(struct ieee80211_network *src,
1471 struct ieee80211_network *dst)
1472 {
1473 /* A network is only a duplicate if the channel, BSSID, and ESSID
1474 * all match. We treat all <hidden> with the same BSSID and channel
1475 * as one network */
1476 return ((src->ssid_len == dst->ssid_len) &&
1477 (src->channel == dst->channel) &&
1478 !compare_ether_addr(src->bssid, dst->bssid) &&
1479 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1480 }
1481
1482 static void update_network(struct ieee80211_network *dst,
1483 struct ieee80211_network *src)
1484 {
1485 int qos_active;
1486 u8 old_param;
1487
1488 ieee80211_network_reset(dst);
1489 dst->ibss_dfs = src->ibss_dfs;
1490
1491 /* We only update the statistics if they were created by receiving
1492 * the network information on the actual channel the network is on.
1493 *
1494 * This keeps beacons received on neighbor channels from bringing
1495 * down the signal level of an AP. */
1496 if (dst->channel == src->stats.received_channel)
1497 memcpy(&dst->stats, &src->stats,
1498 sizeof(struct ieee80211_rx_stats));
1499 else
1500 IEEE80211_DEBUG_SCAN("Network " MAC_FMT " info received "
1501 "off channel (%d vs. %d)\n", MAC_ARG(src->bssid),
1502 dst->channel, src->stats.received_channel);
1503
1504 dst->capability = src->capability;
1505 memcpy(dst->rates, src->rates, src->rates_len);
1506 dst->rates_len = src->rates_len;
1507 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1508 dst->rates_ex_len = src->rates_ex_len;
1509
1510 dst->mode = src->mode;
1511 dst->flags = src->flags;
1512 dst->time_stamp[0] = src->time_stamp[0];
1513 dst->time_stamp[1] = src->time_stamp[1];
1514
1515 dst->beacon_interval = src->beacon_interval;
1516 dst->listen_interval = src->listen_interval;
1517 dst->atim_window = src->atim_window;
1518 dst->erp_value = src->erp_value;
1519 dst->tim = src->tim;
1520
1521 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1522 dst->wpa_ie_len = src->wpa_ie_len;
1523 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1524 dst->rsn_ie_len = src->rsn_ie_len;
1525
1526 dst->last_scanned = jiffies;
1527 qos_active = src->qos_data.active;
1528 old_param = dst->qos_data.old_param_count;
1529 if (dst->flags & NETWORK_HAS_QOS_MASK)
1530 memcpy(&dst->qos_data, &src->qos_data,
1531 sizeof(struct ieee80211_qos_data));
1532 else {
1533 dst->qos_data.supported = src->qos_data.supported;
1534 dst->qos_data.param_count = src->qos_data.param_count;
1535 }
1536
1537 if (dst->qos_data.supported == 1) {
1538 if (dst->ssid_len)
1539 IEEE80211_DEBUG_QOS
1540 ("QoS the network %s is QoS supported\n",
1541 dst->ssid);
1542 else
1543 IEEE80211_DEBUG_QOS
1544 ("QoS the network is QoS supported\n");
1545 }
1546 dst->qos_data.active = qos_active;
1547 dst->qos_data.old_param_count = old_param;
1548
1549 /* dst->last_associate is not overwritten */
1550 }
1551
1552 static inline int is_beacon(__le16 fc)
1553 {
1554 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1555 }
1556
1557 static void ieee80211_process_probe_response(struct ieee80211_device
1558 *ieee, struct
1559 ieee80211_probe_response
1560 *beacon, struct ieee80211_rx_stats
1561 *stats)
1562 {
1563 struct net_device *dev = ieee->dev;
1564 struct ieee80211_network network = {
1565 .ibss_dfs = NULL,
1566 };
1567 struct ieee80211_network *target;
1568 struct ieee80211_network *oldest = NULL;
1569 #ifdef CONFIG_IEEE80211_DEBUG
1570 struct ieee80211_info_element *info_element = beacon->info_element;
1571 #endif
1572 unsigned long flags;
1573
1574 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1575 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1576 escape_essid(info_element->data,
1577 info_element->len),
1578 MAC_ARG(beacon->header.addr3),
1579 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1580 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1581 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1582 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1583 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1584 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1585 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1586 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1587 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1588 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1589 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1590 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1591 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1592 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1593 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1594 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1595
1596 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1597 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1598 escape_essid(info_element->data,
1599 info_element->len),
1600 MAC_ARG(beacon->header.addr3),
1601 is_beacon(beacon->header.frame_ctl) ?
1602 "BEACON" : "PROBE RESPONSE");
1603 return;
1604 }
1605
1606 /* The network parsed correctly -- so now we scan our known networks
1607 * to see if we can find it in our list.
1608 *
1609 * NOTE: This search is definitely not optimized. Once its doing
1610 * the "right thing" we'll optimize it for efficiency if
1611 * necessary */
1612
1613 /* Search for this entry in the list and update it if it is
1614 * already there. */
1615
1616 spin_lock_irqsave(&ieee->lock, flags);
1617
1618 list_for_each_entry(target, &ieee->network_list, list) {
1619 if (is_same_network(target, &network))
1620 break;
1621
1622 if ((oldest == NULL) ||
1623 (target->last_scanned < oldest->last_scanned))
1624 oldest = target;
1625 }
1626
1627 /* If we didn't find a match, then get a new network slot to initialize
1628 * with this beacon's information */
1629 if (&target->list == &ieee->network_list) {
1630 if (list_empty(&ieee->network_free_list)) {
1631 /* If there are no more slots, expire the oldest */
1632 list_del(&oldest->list);
1633 target = oldest;
1634 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1635 "network list.\n",
1636 escape_essid(target->ssid,
1637 target->ssid_len),
1638 MAC_ARG(target->bssid));
1639 ieee80211_network_reset(target);
1640 } else {
1641 /* Otherwise just pull from the free list */
1642 target = list_entry(ieee->network_free_list.next,
1643 struct ieee80211_network, list);
1644 list_del(ieee->network_free_list.next);
1645 }
1646
1647 #ifdef CONFIG_IEEE80211_DEBUG
1648 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1649 escape_essid(network.ssid,
1650 network.ssid_len),
1651 MAC_ARG(network.bssid),
1652 is_beacon(beacon->header.frame_ctl) ?
1653 "BEACON" : "PROBE RESPONSE");
1654 #endif
1655 memcpy(target, &network, sizeof(*target));
1656 network.ibss_dfs = NULL;
1657 list_add_tail(&target->list, &ieee->network_list);
1658 } else {
1659 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1660 escape_essid(target->ssid,
1661 target->ssid_len),
1662 MAC_ARG(target->bssid),
1663 is_beacon(beacon->header.frame_ctl) ?
1664 "BEACON" : "PROBE RESPONSE");
1665 update_network(target, &network);
1666 network.ibss_dfs = NULL;
1667 }
1668
1669 spin_unlock_irqrestore(&ieee->lock, flags);
1670
1671 if (is_beacon(beacon->header.frame_ctl)) {
1672 if (ieee->handle_beacon != NULL)
1673 ieee->handle_beacon(dev, beacon, target);
1674 } else {
1675 if (ieee->handle_probe_response != NULL)
1676 ieee->handle_probe_response(dev, beacon, target);
1677 }
1678 }
1679
1680 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1681 struct ieee80211_hdr_4addr *header,
1682 struct ieee80211_rx_stats *stats)
1683 {
1684 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1685 case IEEE80211_STYPE_ASSOC_RESP:
1686 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1687 WLAN_FC_GET_STYPE(le16_to_cpu
1688 (header->frame_ctl)));
1689 ieee80211_handle_assoc_resp(ieee,
1690 (struct ieee80211_assoc_response *)
1691 header, stats);
1692 break;
1693
1694 case IEEE80211_STYPE_REASSOC_RESP:
1695 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1696 WLAN_FC_GET_STYPE(le16_to_cpu
1697 (header->frame_ctl)));
1698 break;
1699
1700 case IEEE80211_STYPE_PROBE_REQ:
1701 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1702 WLAN_FC_GET_STYPE(le16_to_cpu
1703 (header->frame_ctl)));
1704
1705 if (ieee->handle_probe_request != NULL)
1706 ieee->handle_probe_request(ieee->dev,
1707 (struct
1708 ieee80211_probe_request *)
1709 header, stats);
1710 break;
1711
1712 case IEEE80211_STYPE_PROBE_RESP:
1713 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1714 WLAN_FC_GET_STYPE(le16_to_cpu
1715 (header->frame_ctl)));
1716 IEEE80211_DEBUG_SCAN("Probe response\n");
1717 ieee80211_process_probe_response(ieee,
1718 (struct
1719 ieee80211_probe_response *)
1720 header, stats);
1721 break;
1722
1723 case IEEE80211_STYPE_BEACON:
1724 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1725 WLAN_FC_GET_STYPE(le16_to_cpu
1726 (header->frame_ctl)));
1727 IEEE80211_DEBUG_SCAN("Beacon\n");
1728 ieee80211_process_probe_response(ieee,
1729 (struct
1730 ieee80211_probe_response *)
1731 header, stats);
1732 break;
1733 case IEEE80211_STYPE_AUTH:
1734
1735 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1736 WLAN_FC_GET_STYPE(le16_to_cpu
1737 (header->frame_ctl)));
1738
1739 if (ieee->handle_auth != NULL)
1740 ieee->handle_auth(ieee->dev,
1741 (struct ieee80211_auth *)header);
1742 break;
1743
1744 case IEEE80211_STYPE_DISASSOC:
1745 if (ieee->handle_disassoc != NULL)
1746 ieee->handle_disassoc(ieee->dev,
1747 (struct ieee80211_disassoc *)
1748 header);
1749 break;
1750
1751 case IEEE80211_STYPE_ACTION:
1752 IEEE80211_DEBUG_MGMT("ACTION\n");
1753 if (ieee->handle_action)
1754 ieee->handle_action(ieee->dev,
1755 (struct ieee80211_action *)
1756 header, stats);
1757 break;
1758
1759 case IEEE80211_STYPE_REASSOC_REQ:
1760 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1761 WLAN_FC_GET_STYPE(le16_to_cpu
1762 (header->frame_ctl)));
1763
1764 IEEE80211_DEBUG_MGMT("%s: IEEE80211_REASSOC_REQ received\n",
1765 ieee->dev->name);
1766 if (ieee->handle_reassoc_request != NULL)
1767 ieee->handle_reassoc_request(ieee->dev,
1768 (struct ieee80211_reassoc_request *)
1769 header);
1770 break;
1771
1772 case IEEE80211_STYPE_ASSOC_REQ:
1773 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1774 WLAN_FC_GET_STYPE(le16_to_cpu
1775 (header->frame_ctl)));
1776
1777 IEEE80211_DEBUG_MGMT("%s: IEEE80211_ASSOC_REQ received\n",
1778 ieee->dev->name);
1779 if (ieee->handle_assoc_request != NULL)
1780 ieee->handle_assoc_request(ieee->dev);
1781 break;
1782
1783 case IEEE80211_STYPE_DEAUTH:
1784 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1785 if (ieee->handle_deauth != NULL)
1786 ieee->handle_deauth(ieee->dev,
1787 (struct ieee80211_deauth *)
1788 header);
1789 break;
1790 default:
1791 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1792 WLAN_FC_GET_STYPE(le16_to_cpu
1793 (header->frame_ctl)));
1794 IEEE80211_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1795 ieee->dev->name,
1796 WLAN_FC_GET_STYPE(le16_to_cpu
1797 (header->frame_ctl)));
1798 break;
1799 }
1800 }
1801
1802 EXPORT_SYMBOL_GPL(ieee80211_rx_any);
1803 EXPORT_SYMBOL(ieee80211_rx_mgt);
1804 EXPORT_SYMBOL(ieee80211_rx);
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