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[PATCH] SPI: spi_bitbang: clocking fixes
[linux-2.6/linux-loongson.git] / net / ieee80211 / ieee80211_rx.c
blob604b7b0097bce98dd71f120b77a86ad9363fa438
1 /*
2 * Original code based Host AP (software wireless LAN access point) driver
3 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
4 *
5 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
6 * <jkmaline@cc.hut.fi>
7 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
8 * Copyright (c) 2004-2005, Intel Corporation
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation. See README and COPYING for
13 * more details.
14 */
15
16 #include <linux/compiler.h>
17 #include <linux/config.h>
18 #include <linux/errno.h>
19 #include <linux/if_arp.h>
20 #include <linux/in6.h>
21 #include <linux/in.h>
22 #include <linux/ip.h>
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
26 #include <linux/proc_fs.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <linux/tcp.h>
30 #include <linux/types.h>
31 #include <linux/wireless.h>
32 #include <linux/etherdevice.h>
33 #include <asm/uaccess.h>
34 #include <linux/ctype.h>
35
36 #include <net/ieee80211.h>
37
38 static void ieee80211_monitor_rx(struct ieee80211_device *ieee,
39 struct sk_buff *skb,
40 struct ieee80211_rx_stats *rx_stats)
41 {
42 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
43 u16 fc = le16_to_cpu(hdr->frame_ctl);
44
45 skb->dev = ieee->dev;
46 skb->mac.raw = skb->data;
47 skb_pull(skb, ieee80211_get_hdrlen(fc));
48 skb->pkt_type = PACKET_OTHERHOST;
49 skb->protocol = __constant_htons(ETH_P_80211_RAW);
50 memset(skb->cb, 0, sizeof(skb->cb));
51 netif_rx(skb);
52 }
53
54 /* Called only as a tasklet (software IRQ) */
55 static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
56 ieee80211_device
57 *ieee,
58 unsigned int seq,
59 unsigned int frag,
60 u8 * src,
61 u8 * dst)
62 {
63 struct ieee80211_frag_entry *entry;
64 int i;
65
66 for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
67 entry = &ieee->frag_cache[i];
68 if (entry->skb != NULL &&
69 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
70 IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
71 "seq=%u last_frag=%u\n",
72 entry->seq, entry->last_frag);
73 dev_kfree_skb_any(entry->skb);
74 entry->skb = NULL;
75 }
76
77 if (entry->skb != NULL && entry->seq == seq &&
78 (entry->last_frag + 1 == frag || frag == -1) &&
79 !compare_ether_addr(entry->src_addr, src) &&
80 !compare_ether_addr(entry->dst_addr, dst))
81 return entry;
82 }
83
84 return NULL;
85 }
86
87 /* Called only as a tasklet (software IRQ) */
88 static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
89 struct ieee80211_hdr_4addr *hdr)
90 {
91 struct sk_buff *skb = NULL;
92 u16 sc;
93 unsigned int frag, seq;
94 struct ieee80211_frag_entry *entry;
95
96 sc = le16_to_cpu(hdr->seq_ctl);
97 frag = WLAN_GET_SEQ_FRAG(sc);
98 seq = WLAN_GET_SEQ_SEQ(sc);
99
100 if (frag == 0) {
101 /* Reserve enough space to fit maximum frame length */
102 skb = dev_alloc_skb(ieee->dev->mtu +
103 sizeof(struct ieee80211_hdr_4addr) +
104 8 /* LLC */ +
105 2 /* alignment */ +
106 8 /* WEP */ + ETH_ALEN /* WDS */ );
107 if (skb == NULL)
108 return NULL;
109
110 entry = &ieee->frag_cache[ieee->frag_next_idx];
111 ieee->frag_next_idx++;
112 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
113 ieee->frag_next_idx = 0;
114
115 if (entry->skb != NULL)
116 dev_kfree_skb_any(entry->skb);
117
118 entry->first_frag_time = jiffies;
119 entry->seq = seq;
120 entry->last_frag = frag;
121 entry->skb = skb;
122 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
123 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
124 } else {
125 /* received a fragment of a frame for which the head fragment
126 * should have already been received */
127 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
128 hdr->addr1);
129 if (entry != NULL) {
130 entry->last_frag = frag;
131 skb = entry->skb;
132 }
133 }
134
135 return skb;
136 }
137
138 /* Called only as a tasklet (software IRQ) */
139 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
140 struct ieee80211_hdr_4addr *hdr)
141 {
142 u16 sc;
143 unsigned int seq;
144 struct ieee80211_frag_entry *entry;
145
146 sc = le16_to_cpu(hdr->seq_ctl);
147 seq = WLAN_GET_SEQ_SEQ(sc);
148
149 entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
150 hdr->addr1);
151
152 if (entry == NULL) {
153 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
154 "entry (seq=%u)\n", seq);
155 return -1;
156 }
157
158 entry->skb = NULL;
159 return 0;
160 }
161
162 #ifdef NOT_YET
163 /* ieee80211_rx_frame_mgtmt
164 *
165 * Responsible for handling management control frames
166 *
167 * Called by ieee80211_rx */
168 static int
169 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
170 struct ieee80211_rx_stats *rx_stats, u16 type,
171 u16 stype)
172 {
173 if (ieee->iw_mode == IW_MODE_MASTER) {
174 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
175 ieee->dev->name);
176 return 0;
177 /*
178 hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
179 skb->data);*/
180 }
181
182 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
183 if (stype == WLAN_FC_STYPE_BEACON &&
184 ieee->iw_mode == IW_MODE_MASTER) {
185 struct sk_buff *skb2;
186 /* Process beacon frames also in kernel driver to
187 * update STA(AP) table statistics */
188 skb2 = skb_clone(skb, GFP_ATOMIC);
189 if (skb2)
190 hostap_rx(skb2->dev, skb2, rx_stats);
191 }
192
193 /* send management frames to the user space daemon for
194 * processing */
195 ieee->apdevstats.rx_packets++;
196 ieee->apdevstats.rx_bytes += skb->len;
197 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
198 return 0;
199 }
200
201 if (ieee->iw_mode == IW_MODE_MASTER) {
202 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
203 printk(KERN_DEBUG "%s: unknown management frame "
204 "(type=0x%02x, stype=0x%02x) dropped\n",
205 skb->dev->name, type, stype);
206 return -1;
207 }
208
209 hostap_rx(skb->dev, skb, rx_stats);
210 return 0;
211 }
212
213 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
214 "received in non-Host AP mode\n", skb->dev->name);
215 return -1;
216 }
217 #endif
218
219 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
220 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
221 static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
222
223 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
224 static unsigned char bridge_tunnel_header[] =
225 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
226 /* No encapsulation header if EtherType < 0x600 (=length) */
227
228 /* Called by ieee80211_rx_frame_decrypt */
229 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
230 struct sk_buff *skb)
231 {
232 struct net_device *dev = ieee->dev;
233 u16 fc, ethertype;
234 struct ieee80211_hdr_3addr *hdr;
235 u8 *pos;
236
237 if (skb->len < 24)
238 return 0;
239
240 hdr = (struct ieee80211_hdr_3addr *)skb->data;
241 fc = le16_to_cpu(hdr->frame_ctl);
242
243 /* check that the frame is unicast frame to us */
244 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
245 IEEE80211_FCTL_TODS &&
246 !compare_ether_addr(hdr->addr1, dev->dev_addr) &&
247 !compare_ether_addr(hdr->addr3, dev->dev_addr)) {
248 /* ToDS frame with own addr BSSID and DA */
249 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
250 IEEE80211_FCTL_FROMDS &&
251 !compare_ether_addr(hdr->addr1, dev->dev_addr)) {
252 /* FromDS frame with own addr as DA */
253 } else
254 return 0;
255
256 if (skb->len < 24 + 8)
257 return 0;
258
259 /* check for port access entity Ethernet type */
260 pos = skb->data + 24;
261 ethertype = (pos[6] << 8) | pos[7];
262 if (ethertype == ETH_P_PAE)
263 return 1;
264
265 return 0;
266 }
267
268 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
269 static int
270 ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
271 struct ieee80211_crypt_data *crypt)
272 {
273 struct ieee80211_hdr_3addr *hdr;
274 int res, hdrlen;
275
276 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
277 return 0;
278
279 hdr = (struct ieee80211_hdr_3addr *)skb->data;
280 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
281
282 atomic_inc(&crypt->refcnt);
283 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
284 atomic_dec(&crypt->refcnt);
285 if (res < 0) {
286 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
287 ") res=%d\n", MAC_ARG(hdr->addr2), res);
288 if (res == -2)
289 IEEE80211_DEBUG_DROP("Decryption failed ICV "
290 "mismatch (key %d)\n",
291 skb->data[hdrlen + 3] >> 6);
292 ieee->ieee_stats.rx_discards_undecryptable++;
293 return -1;
294 }
295
296 return res;
297 }
298
299 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
300 static int
301 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
302 struct sk_buff *skb, int keyidx,
303 struct ieee80211_crypt_data *crypt)
304 {
305 struct ieee80211_hdr_3addr *hdr;
306 int res, hdrlen;
307
308 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
309 return 0;
310
311 hdr = (struct ieee80211_hdr_3addr *)skb->data;
312 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
313
314 atomic_inc(&crypt->refcnt);
315 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
316 atomic_dec(&crypt->refcnt);
317 if (res < 0) {
318 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
319 " (SA=" MAC_FMT " keyidx=%d)\n",
320 ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
321 return -1;
322 }
323
324 return 0;
325 }
326
327 /* All received frames are sent to this function. @skb contains the frame in
328 * IEEE 802.11 format, i.e., in the format it was sent over air.
329 * This function is called only as a tasklet (software IRQ). */
330 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
331 struct ieee80211_rx_stats *rx_stats)
332 {
333 struct net_device *dev = ieee->dev;
334 struct ieee80211_hdr_4addr *hdr;
335 size_t hdrlen;
336 u16 fc, type, stype, sc;
337 struct net_device_stats *stats;
338 unsigned int frag;
339 u8 *payload;
340 u16 ethertype;
341 #ifdef NOT_YET
342 struct net_device *wds = NULL;
343 struct sk_buff *skb2 = NULL;
344 struct net_device *wds = NULL;
345 int frame_authorized = 0;
346 int from_assoc_ap = 0;
347 void *sta = NULL;
348 #endif
349 u8 dst[ETH_ALEN];
350 u8 src[ETH_ALEN];
351 struct ieee80211_crypt_data *crypt = NULL;
352 int keyidx = 0;
353 int can_be_decrypted = 0;
354
355 hdr = (struct ieee80211_hdr_4addr *)skb->data;
356 stats = &ieee->stats;
357
358 if (skb->len < 10) {
359 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
360 goto rx_dropped;
361 }
362
363 fc = le16_to_cpu(hdr->frame_ctl);
364 type = WLAN_FC_GET_TYPE(fc);
365 stype = WLAN_FC_GET_STYPE(fc);
366 sc = le16_to_cpu(hdr->seq_ctl);
367 frag = WLAN_GET_SEQ_FRAG(sc);
368 hdrlen = ieee80211_get_hdrlen(fc);
369
370 /* Put this code here so that we avoid duplicating it in all
371 * Rx paths. - Jean II */
372 #ifdef CONFIG_WIRELESS_EXT
373 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
374 /* If spy monitoring on */
375 if (ieee->spy_data.spy_number > 0) {
376 struct iw_quality wstats;
377
378 wstats.updated = 0;
379 if (rx_stats->mask & IEEE80211_STATMASK_RSSI) {
380 wstats.level = rx_stats->rssi;
381 wstats.updated |= IW_QUAL_LEVEL_UPDATED;
382 } else
383 wstats.updated |= IW_QUAL_LEVEL_INVALID;
384
385 if (rx_stats->mask & IEEE80211_STATMASK_NOISE) {
386 wstats.noise = rx_stats->noise;
387 wstats.updated |= IW_QUAL_NOISE_UPDATED;
388 } else
389 wstats.updated |= IW_QUAL_NOISE_INVALID;
390
391 if (rx_stats->mask & IEEE80211_STATMASK_SIGNAL) {
392 wstats.qual = rx_stats->signal;
393 wstats.updated |= IW_QUAL_QUAL_UPDATED;
394 } else
395 wstats.updated |= IW_QUAL_QUAL_INVALID;
396
397 /* Update spy records */
398 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
399 }
400 #endif /* IW_WIRELESS_SPY */
401 #endif /* CONFIG_WIRELESS_EXT */
402
403 #ifdef NOT_YET
404 hostap_update_rx_stats(local->ap, hdr, rx_stats);
405 #endif
406
407 if (ieee->iw_mode == IW_MODE_MONITOR) {
408 ieee80211_monitor_rx(ieee, skb, rx_stats);
409 stats->rx_packets++;
410 stats->rx_bytes += skb->len;
411 return 1;
412 }
413
414 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
415 is_broadcast_ether_addr(hdr->addr2)) ?
416 ieee->host_mc_decrypt : ieee->host_decrypt;
417
418 if (can_be_decrypted) {
419 int idx = 0;
420 if (skb->len >= hdrlen + 3) {
421 /* Top two-bits of byte 3 are the key index */
422 idx = skb->data[hdrlen + 3] >> 6;
423 }
424
425 /* ieee->crypt[] is WEP_KEY (4) in length. Given that idx
426 * is only allowed 2-bits of storage, no value of idx can
427 * be provided via above code that would result in idx
428 * being out of range */
429 crypt = ieee->crypt[idx];
430
431 #ifdef NOT_YET
432 sta = NULL;
433
434 /* Use station specific key to override default keys if the
435 * receiver address is a unicast address ("individual RA"). If
436 * bcrx_sta_key parameter is set, station specific key is used
437 * even with broad/multicast targets (this is against IEEE
438 * 802.11, but makes it easier to use different keys with
439 * stations that do not support WEP key mapping). */
440
441 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
442 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
443 &sta);
444 #endif
445
446 /* allow NULL decrypt to indicate an station specific override
447 * for default encryption */
448 if (crypt && (crypt->ops == NULL ||
449 crypt->ops->decrypt_mpdu == NULL))
450 crypt = NULL;
451
452 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
453 /* This seems to be triggered by some (multicast?)
454 * frames from other than current BSS, so just drop the
455 * frames silently instead of filling system log with
456 * these reports. */
457 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
458 " (SA=" MAC_FMT ")\n",
459 MAC_ARG(hdr->addr2));
460 ieee->ieee_stats.rx_discards_undecryptable++;
461 goto rx_dropped;
462 }
463 }
464 #ifdef NOT_YET
465 if (type != WLAN_FC_TYPE_DATA) {
466 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
467 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
468 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
469 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
470 "from " MAC_FMT "\n", dev->name,
471 MAC_ARG(hdr->addr2));
472 /* TODO: could inform hostapd about this so that it
473 * could send auth failure report */
474 goto rx_dropped;
475 }
476
477 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
478 goto rx_dropped;
479 else
480 goto rx_exit;
481 }
482 #endif
483
484 /* Data frame - extract src/dst addresses */
485 if (skb->len < IEEE80211_3ADDR_LEN)
486 goto rx_dropped;
487
488 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
489 case IEEE80211_FCTL_FROMDS:
490 memcpy(dst, hdr->addr1, ETH_ALEN);
491 memcpy(src, hdr->addr3, ETH_ALEN);
492 break;
493 case IEEE80211_FCTL_TODS:
494 memcpy(dst, hdr->addr3, ETH_ALEN);
495 memcpy(src, hdr->addr2, ETH_ALEN);
496 break;
497 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
498 if (skb->len < IEEE80211_4ADDR_LEN)
499 goto rx_dropped;
500 memcpy(dst, hdr->addr3, ETH_ALEN);
501 memcpy(src, hdr->addr4, ETH_ALEN);
502 break;
503 case 0:
504 memcpy(dst, hdr->addr1, ETH_ALEN);
505 memcpy(src, hdr->addr2, ETH_ALEN);
506 break;
507 }
508
509 #ifdef NOT_YET
510 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
511 goto rx_dropped;
512 if (wds) {
513 skb->dev = dev = wds;
514 stats = hostap_get_stats(dev);
515 }
516
517 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
518 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
519 IEEE80211_FCTL_FROMDS && ieee->stadev
520 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
521 /* Frame from BSSID of the AP for which we are a client */
522 skb->dev = dev = ieee->stadev;
523 stats = hostap_get_stats(dev);
524 from_assoc_ap = 1;
525 }
526 #endif
527
528 dev->last_rx = jiffies;
529
530 #ifdef NOT_YET
531 if ((ieee->iw_mode == IW_MODE_MASTER ||
532 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
533 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
534 wds != NULL)) {
535 case AP_RX_CONTINUE_NOT_AUTHORIZED:
536 frame_authorized = 0;
537 break;
538 case AP_RX_CONTINUE:
539 frame_authorized = 1;
540 break;
541 case AP_RX_DROP:
542 goto rx_dropped;
543 case AP_RX_EXIT:
544 goto rx_exit;
545 }
546 }
547 #endif
548
549 /* Nullfunc frames may have PS-bit set, so they must be passed to
550 * hostap_handle_sta_rx() before being dropped here. */
551
552 stype &= ~IEEE80211_STYPE_QOS_DATA;
553
554 if (stype != IEEE80211_STYPE_DATA &&
555 stype != IEEE80211_STYPE_DATA_CFACK &&
556 stype != IEEE80211_STYPE_DATA_CFPOLL &&
557 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
558 if (stype != IEEE80211_STYPE_NULLFUNC)
559 IEEE80211_DEBUG_DROP("RX: dropped data frame "
560 "with no data (type=0x%02x, "
561 "subtype=0x%02x, len=%d)\n",
562 type, stype, skb->len);
563 goto rx_dropped;
564 }
565
566 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
567
568 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
569 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
570 goto rx_dropped;
571
572 hdr = (struct ieee80211_hdr_4addr *)skb->data;
573
574 /* skb: hdr + (possibly fragmented) plaintext payload */
575 // PR: FIXME: hostap has additional conditions in the "if" below:
576 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
577 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
578 int flen;
579 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
580 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
581
582 if (!frag_skb) {
583 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
584 "Rx cannot get skb from fragment "
585 "cache (morefrag=%d seq=%u frag=%u)\n",
586 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
587 WLAN_GET_SEQ_SEQ(sc), frag);
588 goto rx_dropped;
589 }
590
591 flen = skb->len;
592 if (frag != 0)
593 flen -= hdrlen;
594
595 if (frag_skb->tail + flen > frag_skb->end) {
596 printk(KERN_WARNING "%s: host decrypted and "
597 "reassembled frame did not fit skb\n",
598 dev->name);
599 ieee80211_frag_cache_invalidate(ieee, hdr);
600 goto rx_dropped;
601 }
602
603 if (frag == 0) {
604 /* copy first fragment (including full headers) into
605 * beginning of the fragment cache skb */
606 memcpy(skb_put(frag_skb, flen), skb->data, flen);
607 } else {
608 /* append frame payload to the end of the fragment
609 * cache skb */
610 memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
611 flen);
612 }
613 dev_kfree_skb_any(skb);
614 skb = NULL;
615
616 if (fc & IEEE80211_FCTL_MOREFRAGS) {
617 /* more fragments expected - leave the skb in fragment
618 * cache for now; it will be delivered to upper layers
619 * after all fragments have been received */
620 goto rx_exit;
621 }
622
623 /* this was the last fragment and the frame will be
624 * delivered, so remove skb from fragment cache */
625 skb = frag_skb;
626 hdr = (struct ieee80211_hdr_4addr *)skb->data;
627 ieee80211_frag_cache_invalidate(ieee, hdr);
628 }
629
630 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
631 * encrypted/authenticated */
632 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
633 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
634 goto rx_dropped;
635
636 hdr = (struct ieee80211_hdr_4addr *)skb->data;
637 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
638 if ( /*ieee->ieee802_1x && */
639 ieee80211_is_eapol_frame(ieee, skb)) {
640 /* pass unencrypted EAPOL frames even if encryption is
641 * configured */
642 } else {
643 IEEE80211_DEBUG_DROP("encryption configured, but RX "
644 "frame not encrypted (SA=" MAC_FMT
645 ")\n", MAC_ARG(hdr->addr2));
646 goto rx_dropped;
647 }
648 }
649
650 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
651 !ieee80211_is_eapol_frame(ieee, skb)) {
652 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
653 "frame from " MAC_FMT
654 " (drop_unencrypted=1)\n",
655 MAC_ARG(hdr->addr2));
656 goto rx_dropped;
657 }
658
659 /* skb: hdr + (possible reassembled) full plaintext payload */
660
661 payload = skb->data + hdrlen;
662 ethertype = (payload[6] << 8) | payload[7];
663
664 #ifdef NOT_YET
665 /* If IEEE 802.1X is used, check whether the port is authorized to send
666 * the received frame. */
667 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
668 if (ethertype == ETH_P_PAE) {
669 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
670 dev->name);
671 if (ieee->hostapd && ieee->apdev) {
672 /* Send IEEE 802.1X frames to the user
673 * space daemon for processing */
674 prism2_rx_80211(ieee->apdev, skb, rx_stats,
675 PRISM2_RX_MGMT);
676 ieee->apdevstats.rx_packets++;
677 ieee->apdevstats.rx_bytes += skb->len;
678 goto rx_exit;
679 }
680 } else if (!frame_authorized) {
681 printk(KERN_DEBUG "%s: dropped frame from "
682 "unauthorized port (IEEE 802.1X): "
683 "ethertype=0x%04x\n", dev->name, ethertype);
684 goto rx_dropped;
685 }
686 }
687 #endif
688
689 /* convert hdr + possible LLC headers into Ethernet header */
690 if (skb->len - hdrlen >= 8 &&
691 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
692 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
693 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
694 /* remove RFC1042 or Bridge-Tunnel encapsulation and
695 * replace EtherType */
696 skb_pull(skb, hdrlen + SNAP_SIZE);
697 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
698 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
699 } else {
700 u16 len;
701 /* Leave Ethernet header part of hdr and full payload */
702 skb_pull(skb, hdrlen);
703 len = htons(skb->len);
704 memcpy(skb_push(skb, 2), &len, 2);
705 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
706 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
707 }
708
709 #ifdef NOT_YET
710 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
711 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
712 /* Non-standard frame: get addr4 from its bogus location after
713 * the payload */
714 memcpy(skb->data + ETH_ALEN,
715 skb->data + skb->len - ETH_ALEN, ETH_ALEN);
716 skb_trim(skb, skb->len - ETH_ALEN);
717 }
718 #endif
719
720 stats->rx_packets++;
721 stats->rx_bytes += skb->len;
722
723 #ifdef NOT_YET
724 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
725 if (dst[0] & 0x01) {
726 /* copy multicast frame both to the higher layers and
727 * to the wireless media */
728 ieee->ap->bridged_multicast++;
729 skb2 = skb_clone(skb, GFP_ATOMIC);
730 if (skb2 == NULL)
731 printk(KERN_DEBUG "%s: skb_clone failed for "
732 "multicast frame\n", dev->name);
733 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
734 /* send frame directly to the associated STA using
735 * wireless media and not passing to higher layers */
736 ieee->ap->bridged_unicast++;
737 skb2 = skb;
738 skb = NULL;
739 }
740 }
741
742 if (skb2 != NULL) {
743 /* send to wireless media */
744 skb2->protocol = __constant_htons(ETH_P_802_3);
745 skb2->mac.raw = skb2->nh.raw = skb2->data;
746 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
747 skb2->dev = dev;
748 dev_queue_xmit(skb2);
749 }
750 #endif
751
752 if (skb) {
753 skb->protocol = eth_type_trans(skb, dev);
754 memset(skb->cb, 0, sizeof(skb->cb));
755 skb->dev = dev;
756 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
757 if (netif_rx(skb) == NET_RX_DROP) {
758 /* netif_rx always succeeds, but it might drop
759 * the packet. If it drops the packet, we log that
760 * in our stats. */
761 IEEE80211_DEBUG_DROP
762 ("RX: netif_rx dropped the packet\n");
763 stats->rx_dropped++;
764 }
765 }
766
767 rx_exit:
768 #ifdef NOT_YET
769 if (sta)
770 hostap_handle_sta_release(sta);
771 #endif
772 return 1;
773
774 rx_dropped:
775 stats->rx_dropped++;
776
777 /* Returning 0 indicates to caller that we have not handled the SKB--
778 * so it is still allocated and can be used again by underlying
779 * hardware as a DMA target */
780 return 0;
781 }
782
783 /* Filter out unrelated packets, call ieee80211_rx[_mgt] */
784 int ieee80211_rx_any(struct ieee80211_device *ieee,
785 struct sk_buff *skb, struct ieee80211_rx_stats *stats)
786 {
787 struct ieee80211_hdr_4addr *hdr;
788 int is_packet_for_us;
789 u16 fc;
790
791 if (ieee->iw_mode == IW_MODE_MONITOR)
792 return ieee80211_rx(ieee, skb, stats) ? 0 : -EINVAL;
793
794 hdr = (struct ieee80211_hdr_4addr *)skb->data;
795 fc = le16_to_cpu(hdr->frame_ctl);
796
797 if ((fc & IEEE80211_FCTL_VERS) != 0)
798 return -EINVAL;
799
800 switch (fc & IEEE80211_FCTL_FTYPE) {
801 case IEEE80211_FTYPE_MGMT:
802 ieee80211_rx_mgt(ieee, hdr, stats);
803 return 0;
804 case IEEE80211_FTYPE_DATA:
805 break;
806 case IEEE80211_FTYPE_CTL:
807 return 0;
808 default:
809 return -EINVAL;
810 }
811
812 is_packet_for_us = 0;
813 switch (ieee->iw_mode) {
814 case IW_MODE_ADHOC:
815 /* our BSS and not from/to DS */
816 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
817 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
818 /* promisc: get all */
819 if (ieee->dev->flags & IFF_PROMISC)
820 is_packet_for_us = 1;
821 /* to us */
822 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
823 is_packet_for_us = 1;
824 /* mcast */
825 else if (is_multicast_ether_addr(hdr->addr1))
826 is_packet_for_us = 1;
827 }
828 break;
829 case IW_MODE_INFRA:
830 /* our BSS (== from our AP) and from DS */
831 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
832 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
833 /* promisc: get all */
834 if (ieee->dev->flags & IFF_PROMISC)
835 is_packet_for_us = 1;
836 /* to us */
837 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
838 is_packet_for_us = 1;
839 /* mcast */
840 else if (is_multicast_ether_addr(hdr->addr1)) {
841 /* not our own packet bcasted from AP */
842 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
843 is_packet_for_us = 1;
844 }
845 }
846 break;
847 default:
848 /* ? */
849 break;
850 }
851
852 if (is_packet_for_us)
853 return (ieee80211_rx(ieee, skb, stats) ? 0 : -EINVAL);
854 return 0;
855 }
856
857 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
858
859 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
860
861 /*
862 * Make ther structure we read from the beacon packet has
863 * the right values
864 */
865 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
866 *info_element, int sub_type)
867 {
868
869 if (info_element->qui_subtype != sub_type)
870 return -1;
871 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
872 return -1;
873 if (info_element->qui_type != QOS_OUI_TYPE)
874 return -1;
875 if (info_element->version != QOS_VERSION_1)
876 return -1;
877
878 return 0;
879 }
880
881 /*
882 * Parse a QoS parameter element
883 */
884 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
885 *element_param, struct ieee80211_info_element
886 *info_element)
887 {
888 int ret = 0;
889 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
890
891 if ((info_element == NULL) || (element_param == NULL))
892 return -1;
893
894 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
895 memcpy(element_param->info_element.qui, info_element->data,
896 info_element->len);
897 element_param->info_element.elementID = info_element->id;
898 element_param->info_element.length = info_element->len;
899 } else
900 ret = -1;
901 if (ret == 0)
902 ret = ieee80211_verify_qos_info(&element_param->info_element,
903 QOS_OUI_PARAM_SUB_TYPE);
904 return ret;
905 }
906
907 /*
908 * Parse a QoS information element
909 */
910 static int ieee80211_read_qos_info_element(struct
911 ieee80211_qos_information_element
912 *element_info, struct ieee80211_info_element
913 *info_element)
914 {
915 int ret = 0;
916 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
917
918 if (element_info == NULL)
919 return -1;
920 if (info_element == NULL)
921 return -1;
922
923 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
924 memcpy(element_info->qui, info_element->data,
925 info_element->len);
926 element_info->elementID = info_element->id;
927 element_info->length = info_element->len;
928 } else
929 ret = -1;
930
931 if (ret == 0)
932 ret = ieee80211_verify_qos_info(element_info,
933 QOS_OUI_INFO_SUB_TYPE);
934 return ret;
935 }
936
937 /*
938 * Write QoS parameters from the ac parameters.
939 */
940 static int ieee80211_qos_convert_ac_to_parameters(struct
941 ieee80211_qos_parameter_info
942 *param_elm, struct
943 ieee80211_qos_parameters
944 *qos_param)
945 {
946 int rc = 0;
947 int i;
948 struct ieee80211_qos_ac_parameter *ac_params;
949 u32 txop;
950 u8 cw_min;
951 u8 cw_max;
952
953 for (i = 0; i < QOS_QUEUE_NUM; i++) {
954 ac_params = &(param_elm->ac_params_record[i]);
955
956 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
957 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
958
959 cw_min = ac_params->ecw_min_max & 0x0F;
960 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
961
962 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
963 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
964
965 qos_param->flag[i] =
966 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
967
968 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
969 qos_param->tx_op_limit[i] = (u16) txop;
970 }
971 return rc;
972 }
973
974 /*
975 * we have a generic data element which it may contain QoS information or
976 * parameters element. check the information element length to decide
977 * which type to read
978 */
979 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
980 *info_element,
981 struct ieee80211_network *network)
982 {
983 int rc = 0;
984 struct ieee80211_qos_parameters *qos_param = NULL;
985 struct ieee80211_qos_information_element qos_info_element;
986
987 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
988
989 if (rc == 0) {
990 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
991 network->flags |= NETWORK_HAS_QOS_INFORMATION;
992 } else {
993 struct ieee80211_qos_parameter_info param_element;
994
995 rc = ieee80211_read_qos_param_element(&param_element,
996 info_element);
997 if (rc == 0) {
998 qos_param = &(network->qos_data.parameters);
999 ieee80211_qos_convert_ac_to_parameters(&param_element,
1000 qos_param);
1001 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1002 network->qos_data.param_count =
1003 param_element.info_element.ac_info & 0x0F;
1004 }
1005 }
1006
1007 if (rc == 0) {
1008 IEEE80211_DEBUG_QOS("QoS is supported\n");
1009 network->qos_data.supported = 1;
1010 }
1011 return rc;
1012 }
1013
1014 #ifdef CONFIG_IEEE80211_DEBUG
1015 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1016
1017 static const char *get_info_element_string(u16 id)
1018 {
1019 switch (id) {
1020 MFIE_STRING(SSID);
1021 MFIE_STRING(RATES);
1022 MFIE_STRING(FH_SET);
1023 MFIE_STRING(DS_SET);
1024 MFIE_STRING(CF_SET);
1025 MFIE_STRING(TIM);
1026 MFIE_STRING(IBSS_SET);
1027 MFIE_STRING(COUNTRY);
1028 MFIE_STRING(HOP_PARAMS);
1029 MFIE_STRING(HOP_TABLE);
1030 MFIE_STRING(REQUEST);
1031 MFIE_STRING(CHALLENGE);
1032 MFIE_STRING(POWER_CONSTRAINT);
1033 MFIE_STRING(POWER_CAPABILITY);
1034 MFIE_STRING(TPC_REQUEST);
1035 MFIE_STRING(TPC_REPORT);
1036 MFIE_STRING(SUPP_CHANNELS);
1037 MFIE_STRING(CSA);
1038 MFIE_STRING(MEASURE_REQUEST);
1039 MFIE_STRING(MEASURE_REPORT);
1040 MFIE_STRING(QUIET);
1041 MFIE_STRING(IBSS_DFS);
1042 MFIE_STRING(ERP_INFO);
1043 MFIE_STRING(RSN);
1044 MFIE_STRING(RATES_EX);
1045 MFIE_STRING(GENERIC);
1046 MFIE_STRING(QOS_PARAMETER);
1047 default:
1048 return "UNKNOWN";
1049 }
1050 }
1051 #endif
1052
1053 static int ieee80211_parse_info_param(struct ieee80211_info_element
1054 *info_element, u16 length,
1055 struct ieee80211_network *network)
1056 {
1057 u8 i;
1058 #ifdef CONFIG_IEEE80211_DEBUG
1059 char rates_str[64];
1060 char *p;
1061 #endif
1062
1063 while (length >= sizeof(*info_element)) {
1064 if (sizeof(*info_element) + info_element->len > length) {
1065 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
1066 "info_element->len + 2 > left : "
1067 "info_element->len+2=%zd left=%d, id=%d.\n",
1068 info_element->len +
1069 sizeof(*info_element),
1070 length, info_element->id);
1071 return 1;
1072 }
1073
1074 switch (info_element->id) {
1075 case MFIE_TYPE_SSID:
1076 if (ieee80211_is_empty_essid(info_element->data,
1077 info_element->len)) {
1078 network->flags |= NETWORK_EMPTY_ESSID;
1079 break;
1080 }
1081
1082 network->ssid_len = min(info_element->len,
1083 (u8) IW_ESSID_MAX_SIZE);
1084 memcpy(network->ssid, info_element->data,
1085 network->ssid_len);
1086 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1087 memset(network->ssid + network->ssid_len, 0,
1088 IW_ESSID_MAX_SIZE - network->ssid_len);
1089
1090 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1091 network->ssid, network->ssid_len);
1092 break;
1093
1094 case MFIE_TYPE_RATES:
1095 #ifdef CONFIG_IEEE80211_DEBUG
1096 p = rates_str;
1097 #endif
1098 network->rates_len = min(info_element->len,
1099 MAX_RATES_LENGTH);
1100 for (i = 0; i < network->rates_len; i++) {
1101 network->rates[i] = info_element->data[i];
1102 #ifdef CONFIG_IEEE80211_DEBUG
1103 p += snprintf(p, sizeof(rates_str) -
1104 (p - rates_str), "%02X ",
1105 network->rates[i]);
1106 #endif
1107 if (ieee80211_is_ofdm_rate
1108 (info_element->data[i])) {
1109 network->flags |= NETWORK_HAS_OFDM;
1110 if (info_element->data[i] &
1111 IEEE80211_BASIC_RATE_MASK)
1112 network->flags &=
1113 ~NETWORK_HAS_CCK;
1114 }
1115 }
1116
1117 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1118 rates_str, network->rates_len);
1119 break;
1120
1121 case MFIE_TYPE_RATES_EX:
1122 #ifdef CONFIG_IEEE80211_DEBUG
1123 p = rates_str;
1124 #endif
1125 network->rates_ex_len = min(info_element->len,
1126 MAX_RATES_EX_LENGTH);
1127 for (i = 0; i < network->rates_ex_len; i++) {
1128 network->rates_ex[i] = info_element->data[i];
1129 #ifdef CONFIG_IEEE80211_DEBUG
1130 p += snprintf(p, sizeof(rates_str) -
1131 (p - rates_str), "%02X ",
1132 network->rates[i]);
1133 #endif
1134 if (ieee80211_is_ofdm_rate
1135 (info_element->data[i])) {
1136 network->flags |= NETWORK_HAS_OFDM;
1137 if (info_element->data[i] &
1138 IEEE80211_BASIC_RATE_MASK)
1139 network->flags &=
1140 ~NETWORK_HAS_CCK;
1141 }
1142 }
1143
1144 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1145 rates_str, network->rates_ex_len);
1146 break;
1147
1148 case MFIE_TYPE_DS_SET:
1149 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1150 info_element->data[0]);
1151 network->channel = info_element->data[0];
1152 break;
1153
1154 case MFIE_TYPE_FH_SET:
1155 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1156 break;
1157
1158 case MFIE_TYPE_CF_SET:
1159 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1160 break;
1161
1162 case MFIE_TYPE_TIM:
1163 network->tim.tim_count = info_element->data[0];
1164 network->tim.tim_period = info_element->data[1];
1165 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1166 break;
1167
1168 case MFIE_TYPE_ERP_INFO:
1169 network->erp_value = info_element->data[0];
1170 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1171 network->erp_value);
1172 break;
1173
1174 case MFIE_TYPE_IBSS_SET:
1175 network->atim_window = info_element->data[0];
1176 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1177 network->atim_window);
1178 break;
1179
1180 case MFIE_TYPE_CHALLENGE:
1181 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1182 break;
1183
1184 case MFIE_TYPE_GENERIC:
1185 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1186 info_element->len);
1187 if (!ieee80211_parse_qos_info_param_IE(info_element,
1188 network))
1189 break;
1190
1191 if (info_element->len >= 4 &&
1192 info_element->data[0] == 0x00 &&
1193 info_element->data[1] == 0x50 &&
1194 info_element->data[2] == 0xf2 &&
1195 info_element->data[3] == 0x01) {
1196 network->wpa_ie_len = min(info_element->len + 2,
1197 MAX_WPA_IE_LEN);
1198 memcpy(network->wpa_ie, info_element,
1199 network->wpa_ie_len);
1200 }
1201 break;
1202
1203 case MFIE_TYPE_RSN:
1204 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1205 info_element->len);
1206 network->rsn_ie_len = min(info_element->len + 2,
1207 MAX_WPA_IE_LEN);
1208 memcpy(network->rsn_ie, info_element,
1209 network->rsn_ie_len);
1210 break;
1211
1212 case MFIE_TYPE_QOS_PARAMETER:
1213 printk(KERN_ERR
1214 "QoS Error need to parse QOS_PARAMETER IE\n");
1215 break;
1216 /* 802.11h */
1217 case MFIE_TYPE_POWER_CONSTRAINT:
1218 network->power_constraint = info_element->data[0];
1219 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1220 break;
1221
1222 case MFIE_TYPE_CSA:
1223 network->power_constraint = info_element->data[0];
1224 network->flags |= NETWORK_HAS_CSA;
1225 break;
1226
1227 case MFIE_TYPE_QUIET:
1228 network->quiet.count = info_element->data[0];
1229 network->quiet.period = info_element->data[1];
1230 network->quiet.duration = info_element->data[2];
1231 network->quiet.offset = info_element->data[3];
1232 network->flags |= NETWORK_HAS_QUIET;
1233 break;
1234
1235 case MFIE_TYPE_IBSS_DFS:
1236 if (network->ibss_dfs)
1237 break;
1238 network->ibss_dfs =
1239 kmalloc(info_element->len, GFP_ATOMIC);
1240 if (!network->ibss_dfs)
1241 return 1;
1242 memcpy(network->ibss_dfs, info_element->data,
1243 info_element->len);
1244 network->flags |= NETWORK_HAS_IBSS_DFS;
1245 break;
1246
1247 case MFIE_TYPE_TPC_REPORT:
1248 network->tpc_report.transmit_power =
1249 info_element->data[0];
1250 network->tpc_report.link_margin = info_element->data[1];
1251 network->flags |= NETWORK_HAS_TPC_REPORT;
1252 break;
1253
1254 default:
1255 IEEE80211_DEBUG_MGMT
1256 ("Unsupported info element: %s (%d)\n",
1257 get_info_element_string(info_element->id),
1258 info_element->id);
1259 break;
1260 }
1261
1262 length -= sizeof(*info_element) + info_element->len;
1263 info_element =
1264 (struct ieee80211_info_element *)&info_element->
1265 data[info_element->len];
1266 }
1267
1268 return 0;
1269 }
1270
1271 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1272 *frame, struct ieee80211_rx_stats *stats)
1273 {
1274 struct ieee80211_network network_resp = {
1275 .ibss_dfs = NULL,
1276 };
1277 struct ieee80211_network *network = &network_resp;
1278 struct net_device *dev = ieee->dev;
1279
1280 network->flags = 0;
1281 network->qos_data.active = 0;
1282 network->qos_data.supported = 0;
1283 network->qos_data.param_count = 0;
1284 network->qos_data.old_param_count = 0;
1285
1286 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1287 network->atim_window = le16_to_cpu(frame->aid);
1288 network->listen_interval = le16_to_cpu(frame->status);
1289 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1290 network->capability = le16_to_cpu(frame->capability);
1291 network->last_scanned = jiffies;
1292 network->rates_len = network->rates_ex_len = 0;
1293 network->last_associate = 0;
1294 network->ssid_len = 0;
1295 network->erp_value =
1296 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1297
1298 if (stats->freq == IEEE80211_52GHZ_BAND) {
1299 /* for A band (No DS info) */
1300 network->channel = stats->received_channel;
1301 } else
1302 network->flags |= NETWORK_HAS_CCK;
1303
1304 network->wpa_ie_len = 0;
1305 network->rsn_ie_len = 0;
1306
1307 if (ieee80211_parse_info_param
1308 (frame->info_element, stats->len - sizeof(*frame), network))
1309 return 1;
1310
1311 network->mode = 0;
1312 if (stats->freq == IEEE80211_52GHZ_BAND)
1313 network->mode = IEEE_A;
1314 else {
1315 if (network->flags & NETWORK_HAS_OFDM)
1316 network->mode |= IEEE_G;
1317 if (network->flags & NETWORK_HAS_CCK)
1318 network->mode |= IEEE_B;
1319 }
1320
1321 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1322 network->flags |= NETWORK_EMPTY_ESSID;
1323
1324 memcpy(&network->stats, stats, sizeof(network->stats));
1325
1326 if (ieee->handle_assoc_response != NULL)
1327 ieee->handle_assoc_response(dev, frame, network);
1328
1329 return 0;
1330 }
1331
1332 /***************************************************/
1333
1334 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1335 *beacon,
1336 struct ieee80211_network *network,
1337 struct ieee80211_rx_stats *stats)
1338 {
1339 network->qos_data.active = 0;
1340 network->qos_data.supported = 0;
1341 network->qos_data.param_count = 0;
1342 network->qos_data.old_param_count = 0;
1343
1344 /* Pull out fixed field data */
1345 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1346 network->capability = le16_to_cpu(beacon->capability);
1347 network->last_scanned = jiffies;
1348 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1349 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1350 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1351 /* Where to pull this? beacon->listen_interval; */
1352 network->listen_interval = 0x0A;
1353 network->rates_len = network->rates_ex_len = 0;
1354 network->last_associate = 0;
1355 network->ssid_len = 0;
1356 network->flags = 0;
1357 network->atim_window = 0;
1358 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1359 0x3 : 0x0;
1360
1361 if (stats->freq == IEEE80211_52GHZ_BAND) {
1362 /* for A band (No DS info) */
1363 network->channel = stats->received_channel;
1364 } else
1365 network->flags |= NETWORK_HAS_CCK;
1366
1367 network->wpa_ie_len = 0;
1368 network->rsn_ie_len = 0;
1369
1370 if (ieee80211_parse_info_param
1371 (beacon->info_element, stats->len - sizeof(*beacon), network))
1372 return 1;
1373
1374 network->mode = 0;
1375 if (stats->freq == IEEE80211_52GHZ_BAND)
1376 network->mode = IEEE_A;
1377 else {
1378 if (network->flags & NETWORK_HAS_OFDM)
1379 network->mode |= IEEE_G;
1380 if (network->flags & NETWORK_HAS_CCK)
1381 network->mode |= IEEE_B;
1382 }
1383
1384 if (network->mode == 0) {
1385 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1386 "network.\n",
1387 escape_essid(network->ssid,
1388 network->ssid_len),
1389 MAC_ARG(network->bssid));
1390 return 1;
1391 }
1392
1393 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1394 network->flags |= NETWORK_EMPTY_ESSID;
1395
1396 memcpy(&network->stats, stats, sizeof(network->stats));
1397
1398 return 0;
1399 }
1400
1401 static inline int is_same_network(struct ieee80211_network *src,
1402 struct ieee80211_network *dst)
1403 {
1404 /* A network is only a duplicate if the channel, BSSID, and ESSID
1405 * all match. We treat all <hidden> with the same BSSID and channel
1406 * as one network */
1407 return ((src->ssid_len == dst->ssid_len) &&
1408 (src->channel == dst->channel) &&
1409 !compare_ether_addr(src->bssid, dst->bssid) &&
1410 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1411 }
1412
1413 static void update_network(struct ieee80211_network *dst,
1414 struct ieee80211_network *src)
1415 {
1416 int qos_active;
1417 u8 old_param;
1418
1419 ieee80211_network_reset(dst);
1420 dst->ibss_dfs = src->ibss_dfs;
1421
1422 /* We only update the statistics if they were created by receiving
1423 * the network information on the actual channel the network is on.
1424 *
1425 * This keeps beacons received on neighbor channels from bringing
1426 * down the signal level of an AP. */
1427 if (dst->channel == src->stats.received_channel)
1428 memcpy(&dst->stats, &src->stats,
1429 sizeof(struct ieee80211_rx_stats));
1430 else
1431 IEEE80211_DEBUG_SCAN("Network " MAC_FMT " info received "
1432 "off channel (%d vs. %d)\n", MAC_ARG(src->bssid),
1433 dst->channel, src->stats.received_channel);
1434
1435 dst->capability = src->capability;
1436 memcpy(dst->rates, src->rates, src->rates_len);
1437 dst->rates_len = src->rates_len;
1438 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1439 dst->rates_ex_len = src->rates_ex_len;
1440
1441 dst->mode = src->mode;
1442 dst->flags = src->flags;
1443 dst->time_stamp[0] = src->time_stamp[0];
1444 dst->time_stamp[1] = src->time_stamp[1];
1445
1446 dst->beacon_interval = src->beacon_interval;
1447 dst->listen_interval = src->listen_interval;
1448 dst->atim_window = src->atim_window;
1449 dst->erp_value = src->erp_value;
1450 dst->tim = src->tim;
1451
1452 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1453 dst->wpa_ie_len = src->wpa_ie_len;
1454 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1455 dst->rsn_ie_len = src->rsn_ie_len;
1456
1457 dst->last_scanned = jiffies;
1458 qos_active = src->qos_data.active;
1459 old_param = dst->qos_data.old_param_count;
1460 if (dst->flags & NETWORK_HAS_QOS_MASK)
1461 memcpy(&dst->qos_data, &src->qos_data,
1462 sizeof(struct ieee80211_qos_data));
1463 else {
1464 dst->qos_data.supported = src->qos_data.supported;
1465 dst->qos_data.param_count = src->qos_data.param_count;
1466 }
1467
1468 if (dst->qos_data.supported == 1) {
1469 if (dst->ssid_len)
1470 IEEE80211_DEBUG_QOS
1471 ("QoS the network %s is QoS supported\n",
1472 dst->ssid);
1473 else
1474 IEEE80211_DEBUG_QOS
1475 ("QoS the network is QoS supported\n");
1476 }
1477 dst->qos_data.active = qos_active;
1478 dst->qos_data.old_param_count = old_param;
1479
1480 /* dst->last_associate is not overwritten */
1481 }
1482
1483 static inline int is_beacon(__le16 fc)
1484 {
1485 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1486 }
1487
1488 static void ieee80211_process_probe_response(struct ieee80211_device
1489 *ieee, struct
1490 ieee80211_probe_response
1491 *beacon, struct ieee80211_rx_stats
1492 *stats)
1493 {
1494 struct net_device *dev = ieee->dev;
1495 struct ieee80211_network network = {
1496 .ibss_dfs = NULL,
1497 };
1498 struct ieee80211_network *target;
1499 struct ieee80211_network *oldest = NULL;
1500 #ifdef CONFIG_IEEE80211_DEBUG
1501 struct ieee80211_info_element *info_element = beacon->info_element;
1502 #endif
1503 unsigned long flags;
1504
1505 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1506 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1507 escape_essid(info_element->data,
1508 info_element->len),
1509 MAC_ARG(beacon->header.addr3),
1510 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1511 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1512 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1513 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1514 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1515 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1516 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1517 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1518 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1519 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1520 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1521 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1522 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1523 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1524 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1525 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1526
1527 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1528 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1529 escape_essid(info_element->data,
1530 info_element->len),
1531 MAC_ARG(beacon->header.addr3),
1532 is_beacon(beacon->header.frame_ctl) ?
1533 "BEACON" : "PROBE RESPONSE");
1534 return;
1535 }
1536
1537 /* The network parsed correctly -- so now we scan our known networks
1538 * to see if we can find it in our list.
1539 *
1540 * NOTE: This search is definitely not optimized. Once its doing
1541 * the "right thing" we'll optimize it for efficiency if
1542 * necessary */
1543
1544 /* Search for this entry in the list and update it if it is
1545 * already there. */
1546
1547 spin_lock_irqsave(&ieee->lock, flags);
1548
1549 list_for_each_entry(target, &ieee->network_list, list) {
1550 if (is_same_network(target, &network))
1551 break;
1552
1553 if ((oldest == NULL) ||
1554 (target->last_scanned < oldest->last_scanned))
1555 oldest = target;
1556 }
1557
1558 /* If we didn't find a match, then get a new network slot to initialize
1559 * with this beacon's information */
1560 if (&target->list == &ieee->network_list) {
1561 if (list_empty(&ieee->network_free_list)) {
1562 /* If there are no more slots, expire the oldest */
1563 list_del(&oldest->list);
1564 target = oldest;
1565 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1566 "network list.\n",
1567 escape_essid(target->ssid,
1568 target->ssid_len),
1569 MAC_ARG(target->bssid));
1570 ieee80211_network_reset(target);
1571 } else {
1572 /* Otherwise just pull from the free list */
1573 target = list_entry(ieee->network_free_list.next,
1574 struct ieee80211_network, list);
1575 list_del(ieee->network_free_list.next);
1576 }
1577
1578 #ifdef CONFIG_IEEE80211_DEBUG
1579 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1580 escape_essid(network.ssid,
1581 network.ssid_len),
1582 MAC_ARG(network.bssid),
1583 is_beacon(beacon->header.frame_ctl) ?
1584 "BEACON" : "PROBE RESPONSE");
1585 #endif
1586 memcpy(target, &network, sizeof(*target));
1587 network.ibss_dfs = NULL;
1588 list_add_tail(&target->list, &ieee->network_list);
1589 } else {
1590 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1591 escape_essid(target->ssid,
1592 target->ssid_len),
1593 MAC_ARG(target->bssid),
1594 is_beacon(beacon->header.frame_ctl) ?
1595 "BEACON" : "PROBE RESPONSE");
1596 update_network(target, &network);
1597 network.ibss_dfs = NULL;
1598 }
1599
1600 spin_unlock_irqrestore(&ieee->lock, flags);
1601
1602 if (is_beacon(beacon->header.frame_ctl)) {
1603 if (ieee->handle_beacon != NULL)
1604 ieee->handle_beacon(dev, beacon, target);
1605 } else {
1606 if (ieee->handle_probe_response != NULL)
1607 ieee->handle_probe_response(dev, beacon, target);
1608 }
1609 }
1610
1611 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1612 struct ieee80211_hdr_4addr *header,
1613 struct ieee80211_rx_stats *stats)
1614 {
1615 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1616 case IEEE80211_STYPE_ASSOC_RESP:
1617 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1618 WLAN_FC_GET_STYPE(le16_to_cpu
1619 (header->frame_ctl)));
1620 ieee80211_handle_assoc_resp(ieee,
1621 (struct ieee80211_assoc_response *)
1622 header, stats);
1623 break;
1624
1625 case IEEE80211_STYPE_REASSOC_RESP:
1626 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1627 WLAN_FC_GET_STYPE(le16_to_cpu
1628 (header->frame_ctl)));
1629 break;
1630
1631 case IEEE80211_STYPE_PROBE_REQ:
1632 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1633 WLAN_FC_GET_STYPE(le16_to_cpu
1634 (header->frame_ctl)));
1635
1636 if (ieee->handle_probe_request != NULL)
1637 ieee->handle_probe_request(ieee->dev,
1638 (struct
1639 ieee80211_probe_request *)
1640 header, stats);
1641 break;
1642
1643 case IEEE80211_STYPE_PROBE_RESP:
1644 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1645 WLAN_FC_GET_STYPE(le16_to_cpu
1646 (header->frame_ctl)));
1647 IEEE80211_DEBUG_SCAN("Probe response\n");
1648 ieee80211_process_probe_response(ieee,
1649 (struct
1650 ieee80211_probe_response *)
1651 header, stats);
1652 break;
1653
1654 case IEEE80211_STYPE_BEACON:
1655 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1656 WLAN_FC_GET_STYPE(le16_to_cpu
1657 (header->frame_ctl)));
1658 IEEE80211_DEBUG_SCAN("Beacon\n");
1659 ieee80211_process_probe_response(ieee,
1660 (struct
1661 ieee80211_probe_response *)
1662 header, stats);
1663 break;
1664 case IEEE80211_STYPE_AUTH:
1665
1666 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1667 WLAN_FC_GET_STYPE(le16_to_cpu
1668 (header->frame_ctl)));
1669
1670 if (ieee->handle_auth != NULL)
1671 ieee->handle_auth(ieee->dev,
1672 (struct ieee80211_auth *)header);
1673 break;
1674
1675 case IEEE80211_STYPE_DISASSOC:
1676 if (ieee->handle_disassoc != NULL)
1677 ieee->handle_disassoc(ieee->dev,
1678 (struct ieee80211_disassoc *)
1679 header);
1680 break;
1681
1682 case IEEE80211_STYPE_ACTION:
1683 IEEE80211_DEBUG_MGMT("ACTION\n");
1684 if (ieee->handle_action)
1685 ieee->handle_action(ieee->dev,
1686 (struct ieee80211_action *)
1687 header, stats);
1688 break;
1689
1690 case IEEE80211_STYPE_REASSOC_REQ:
1691 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1692 WLAN_FC_GET_STYPE(le16_to_cpu
1693 (header->frame_ctl)));
1694
1695 IEEE80211_WARNING("%s: IEEE80211_REASSOC_REQ received\n",
1696 ieee->dev->name);
1697 if (ieee->handle_reassoc_request != NULL)
1698 ieee->handle_reassoc_request(ieee->dev,
1699 (struct ieee80211_reassoc_request *)
1700 header);
1701 break;
1702
1703 case IEEE80211_STYPE_ASSOC_REQ:
1704 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1705 WLAN_FC_GET_STYPE(le16_to_cpu
1706 (header->frame_ctl)));
1707
1708 IEEE80211_WARNING("%s: IEEE80211_ASSOC_REQ received\n",
1709 ieee->dev->name);
1710 if (ieee->handle_assoc_request != NULL)
1711 ieee->handle_assoc_request(ieee->dev);
1712 break;
1713
1714 case IEEE80211_STYPE_DEAUTH:
1715 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1716 if (ieee->handle_deauth != NULL)
1717 ieee->handle_deauth(ieee->dev,
1718 (struct ieee80211_deauth *)
1719 header);
1720 break;
1721 default:
1722 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1723 WLAN_FC_GET_STYPE(le16_to_cpu
1724 (header->frame_ctl)));
1725 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1726 ieee->dev->name,
1727 WLAN_FC_GET_STYPE(le16_to_cpu
1728 (header->frame_ctl)));
1729 break;
1730 }
1731 }
1732
1733 EXPORT_SYMBOL(ieee80211_rx_mgt);
1734 EXPORT_SYMBOL(ieee80211_rx);
linux kernel for loongson