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[PATCH] load_module() cleanup
[linux-2.6/linux-loongson.git] / net / ieee80211 / ieee80211_rx.c
blob2bf567fd5a17143a096518def05a21cf2f5ccdbc
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 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
401 #ifdef NOT_YET
402 hostap_update_rx_stats(local->ap, hdr, rx_stats);
403 #endif
404
405 if (ieee->iw_mode == IW_MODE_MONITOR) {
406 ieee80211_monitor_rx(ieee, skb, rx_stats);
407 stats->rx_packets++;
408 stats->rx_bytes += skb->len;
409 return 1;
410 }
411
412 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
413 is_broadcast_ether_addr(hdr->addr2)) ?
414 ieee->host_mc_decrypt : ieee->host_decrypt;
415
416 if (can_be_decrypted) {
417 int idx = 0;
418 if (skb->len >= hdrlen + 3) {
419 /* Top two-bits of byte 3 are the key index */
420 idx = skb->data[hdrlen + 3] >> 6;
421 }
422
423 /* ieee->crypt[] is WEP_KEY (4) in length. Given that idx
424 * is only allowed 2-bits of storage, no value of idx can
425 * be provided via above code that would result in idx
426 * being out of range */
427 crypt = ieee->crypt[idx];
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
482 /* Data frame - extract src/dst addresses */
483 if (skb->len < IEEE80211_3ADDR_LEN)
484 goto rx_dropped;
485
486 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
487 case IEEE80211_FCTL_FROMDS:
488 memcpy(dst, hdr->addr1, ETH_ALEN);
489 memcpy(src, hdr->addr3, ETH_ALEN);
490 break;
491 case IEEE80211_FCTL_TODS:
492 memcpy(dst, hdr->addr3, ETH_ALEN);
493 memcpy(src, hdr->addr2, ETH_ALEN);
494 break;
495 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
496 if (skb->len < IEEE80211_4ADDR_LEN)
497 goto rx_dropped;
498 memcpy(dst, hdr->addr3, ETH_ALEN);
499 memcpy(src, hdr->addr4, ETH_ALEN);
500 break;
501 case 0:
502 memcpy(dst, hdr->addr1, ETH_ALEN);
503 memcpy(src, hdr->addr2, ETH_ALEN);
504 break;
505 }
506
507 #ifdef NOT_YET
508 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
509 goto rx_dropped;
510 if (wds) {
511 skb->dev = dev = wds;
512 stats = hostap_get_stats(dev);
513 }
514
515 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
516 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
517 IEEE80211_FCTL_FROMDS && ieee->stadev
518 && !compare_ether_addr(hdr->addr2, ieee->assoc_ap_addr)) {
519 /* Frame from BSSID of the AP for which we are a client */
520 skb->dev = dev = ieee->stadev;
521 stats = hostap_get_stats(dev);
522 from_assoc_ap = 1;
523 }
524 #endif
525
526 dev->last_rx = jiffies;
527
528 #ifdef NOT_YET
529 if ((ieee->iw_mode == IW_MODE_MASTER ||
530 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
531 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
532 wds != NULL)) {
533 case AP_RX_CONTINUE_NOT_AUTHORIZED:
534 frame_authorized = 0;
535 break;
536 case AP_RX_CONTINUE:
537 frame_authorized = 1;
538 break;
539 case AP_RX_DROP:
540 goto rx_dropped;
541 case AP_RX_EXIT:
542 goto rx_exit;
543 }
544 }
545 #endif
546
547 /* Nullfunc frames may have PS-bit set, so they must be passed to
548 * hostap_handle_sta_rx() before being dropped here. */
549
550 stype &= ~IEEE80211_STYPE_QOS_DATA;
551
552 if (stype != IEEE80211_STYPE_DATA &&
553 stype != IEEE80211_STYPE_DATA_CFACK &&
554 stype != IEEE80211_STYPE_DATA_CFPOLL &&
555 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
556 if (stype != IEEE80211_STYPE_NULLFUNC)
557 IEEE80211_DEBUG_DROP("RX: dropped data frame "
558 "with no data (type=0x%02x, "
559 "subtype=0x%02x, len=%d)\n",
560 type, stype, skb->len);
561 goto rx_dropped;
562 }
563
564 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
565
566 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
567 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
568 goto rx_dropped;
569
570 hdr = (struct ieee80211_hdr_4addr *)skb->data;
571
572 /* skb: hdr + (possibly fragmented) plaintext payload */
573 // PR: FIXME: hostap has additional conditions in the "if" below:
574 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
575 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
576 int flen;
577 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
578 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
579
580 if (!frag_skb) {
581 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
582 "Rx cannot get skb from fragment "
583 "cache (morefrag=%d seq=%u frag=%u)\n",
584 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
585 WLAN_GET_SEQ_SEQ(sc), frag);
586 goto rx_dropped;
587 }
588
589 flen = skb->len;
590 if (frag != 0)
591 flen -= hdrlen;
592
593 if (frag_skb->tail + flen > frag_skb->end) {
594 printk(KERN_WARNING "%s: host decrypted and "
595 "reassembled frame did not fit skb\n",
596 dev->name);
597 ieee80211_frag_cache_invalidate(ieee, hdr);
598 goto rx_dropped;
599 }
600
601 if (frag == 0) {
602 /* copy first fragment (including full headers) into
603 * beginning of the fragment cache skb */
604 memcpy(skb_put(frag_skb, flen), skb->data, flen);
605 } else {
606 /* append frame payload to the end of the fragment
607 * cache skb */
608 memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
609 flen);
610 }
611 dev_kfree_skb_any(skb);
612 skb = NULL;
613
614 if (fc & IEEE80211_FCTL_MOREFRAGS) {
615 /* more fragments expected - leave the skb in fragment
616 * cache for now; it will be delivered to upper layers
617 * after all fragments have been received */
618 goto rx_exit;
619 }
620
621 /* this was the last fragment and the frame will be
622 * delivered, so remove skb from fragment cache */
623 skb = frag_skb;
624 hdr = (struct ieee80211_hdr_4addr *)skb->data;
625 ieee80211_frag_cache_invalidate(ieee, hdr);
626 }
627
628 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
629 * encrypted/authenticated */
630 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
631 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
632 goto rx_dropped;
633
634 hdr = (struct ieee80211_hdr_4addr *)skb->data;
635 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
636 if ( /*ieee->ieee802_1x && */
637 ieee80211_is_eapol_frame(ieee, skb)) {
638 /* pass unencrypted EAPOL frames even if encryption is
639 * configured */
640 } else {
641 IEEE80211_DEBUG_DROP("encryption configured, but RX "
642 "frame not encrypted (SA=" MAC_FMT
643 ")\n", MAC_ARG(hdr->addr2));
644 goto rx_dropped;
645 }
646 }
647
648 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
649 !ieee80211_is_eapol_frame(ieee, skb)) {
650 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
651 "frame from " MAC_FMT
652 " (drop_unencrypted=1)\n",
653 MAC_ARG(hdr->addr2));
654 goto rx_dropped;
655 }
656
657 /* skb: hdr + (possible reassembled) full plaintext payload */
658
659 payload = skb->data + hdrlen;
660 ethertype = (payload[6] << 8) | payload[7];
661
662 #ifdef NOT_YET
663 /* If IEEE 802.1X is used, check whether the port is authorized to send
664 * the received frame. */
665 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
666 if (ethertype == ETH_P_PAE) {
667 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
668 dev->name);
669 if (ieee->hostapd && ieee->apdev) {
670 /* Send IEEE 802.1X frames to the user
671 * space daemon for processing */
672 prism2_rx_80211(ieee->apdev, skb, rx_stats,
673 PRISM2_RX_MGMT);
674 ieee->apdevstats.rx_packets++;
675 ieee->apdevstats.rx_bytes += skb->len;
676 goto rx_exit;
677 }
678 } else if (!frame_authorized) {
679 printk(KERN_DEBUG "%s: dropped frame from "
680 "unauthorized port (IEEE 802.1X): "
681 "ethertype=0x%04x\n", dev->name, ethertype);
682 goto rx_dropped;
683 }
684 }
685 #endif
686
687 /* convert hdr + possible LLC headers into Ethernet header */
688 if (skb->len - hdrlen >= 8 &&
689 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
690 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
691 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
692 /* remove RFC1042 or Bridge-Tunnel encapsulation and
693 * replace EtherType */
694 skb_pull(skb, hdrlen + SNAP_SIZE);
695 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
696 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
697 } else {
698 u16 len;
699 /* Leave Ethernet header part of hdr and full payload */
700 skb_pull(skb, hdrlen);
701 len = htons(skb->len);
702 memcpy(skb_push(skb, 2), &len, 2);
703 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
704 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
705 }
706
707 #ifdef NOT_YET
708 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
709 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
710 /* Non-standard frame: get addr4 from its bogus location after
711 * the payload */
712 memcpy(skb->data + ETH_ALEN,
713 skb->data + skb->len - ETH_ALEN, ETH_ALEN);
714 skb_trim(skb, skb->len - ETH_ALEN);
715 }
716 #endif
717
718 stats->rx_packets++;
719 stats->rx_bytes += skb->len;
720
721 #ifdef NOT_YET
722 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
723 if (dst[0] & 0x01) {
724 /* copy multicast frame both to the higher layers and
725 * to the wireless media */
726 ieee->ap->bridged_multicast++;
727 skb2 = skb_clone(skb, GFP_ATOMIC);
728 if (skb2 == NULL)
729 printk(KERN_DEBUG "%s: skb_clone failed for "
730 "multicast frame\n", dev->name);
731 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
732 /* send frame directly to the associated STA using
733 * wireless media and not passing to higher layers */
734 ieee->ap->bridged_unicast++;
735 skb2 = skb;
736 skb = NULL;
737 }
738 }
739
740 if (skb2 != NULL) {
741 /* send to wireless media */
742 skb2->protocol = __constant_htons(ETH_P_802_3);
743 skb2->mac.raw = skb2->nh.raw = skb2->data;
744 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
745 skb2->dev = dev;
746 dev_queue_xmit(skb2);
747 }
748 #endif
749
750 if (skb) {
751 skb->protocol = eth_type_trans(skb, dev);
752 memset(skb->cb, 0, sizeof(skb->cb));
753 skb->dev = dev;
754 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
755 if (netif_rx(skb) == NET_RX_DROP) {
756 /* netif_rx always succeeds, but it might drop
757 * the packet. If it drops the packet, we log that
758 * in our stats. */
759 IEEE80211_DEBUG_DROP
760 ("RX: netif_rx dropped the packet\n");
761 stats->rx_dropped++;
762 }
763 }
764
765 rx_exit:
766 #ifdef NOT_YET
767 if (sta)
768 hostap_handle_sta_release(sta);
769 #endif
770 return 1;
771
772 rx_dropped:
773 stats->rx_dropped++;
774
775 /* Returning 0 indicates to caller that we have not handled the SKB--
776 * so it is still allocated and can be used again by underlying
777 * hardware as a DMA target */
778 return 0;
779 }
780
781 /* Filter out unrelated packets, call ieee80211_rx[_mgt] */
782 int ieee80211_rx_any(struct ieee80211_device *ieee,
783 struct sk_buff *skb, struct ieee80211_rx_stats *stats)
784 {
785 struct ieee80211_hdr_4addr *hdr;
786 int is_packet_for_us;
787 u16 fc;
788
789 if (ieee->iw_mode == IW_MODE_MONITOR)
790 return ieee80211_rx(ieee, skb, stats) ? 0 : -EINVAL;
791
792 hdr = (struct ieee80211_hdr_4addr *)skb->data;
793 fc = le16_to_cpu(hdr->frame_ctl);
794
795 if ((fc & IEEE80211_FCTL_VERS) != 0)
796 return -EINVAL;
797
798 switch (fc & IEEE80211_FCTL_FTYPE) {
799 case IEEE80211_FTYPE_MGMT:
800 ieee80211_rx_mgt(ieee, hdr, stats);
801 return 0;
802 case IEEE80211_FTYPE_DATA:
803 break;
804 case IEEE80211_FTYPE_CTL:
805 return 0;
806 default:
807 return -EINVAL;
808 }
809
810 is_packet_for_us = 0;
811 switch (ieee->iw_mode) {
812 case IW_MODE_ADHOC:
813 /* our BSS and not from/to DS */
814 if (memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) == 0)
815 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
816 /* promisc: get all */
817 if (ieee->dev->flags & IFF_PROMISC)
818 is_packet_for_us = 1;
819 /* to us */
820 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
821 is_packet_for_us = 1;
822 /* mcast */
823 else if (is_multicast_ether_addr(hdr->addr1))
824 is_packet_for_us = 1;
825 }
826 break;
827 case IW_MODE_INFRA:
828 /* our BSS (== from our AP) and from DS */
829 if (memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) == 0)
830 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
831 /* promisc: get all */
832 if (ieee->dev->flags & IFF_PROMISC)
833 is_packet_for_us = 1;
834 /* to us */
835 else if (memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN) == 0)
836 is_packet_for_us = 1;
837 /* mcast */
838 else if (is_multicast_ether_addr(hdr->addr1)) {
839 /* not our own packet bcasted from AP */
840 if (memcmp(hdr->addr3, ieee->dev->dev_addr, ETH_ALEN))
841 is_packet_for_us = 1;
842 }
843 }
844 break;
845 default:
846 /* ? */
847 break;
848 }
849
850 if (is_packet_for_us)
851 return (ieee80211_rx(ieee, skb, stats) ? 0 : -EINVAL);
852 return 0;
853 }
854
855 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
856
857 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
858
859 /*
860 * Make ther structure we read from the beacon packet has
861 * the right values
862 */
863 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
864 *info_element, int sub_type)
865 {
866
867 if (info_element->qui_subtype != sub_type)
868 return -1;
869 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
870 return -1;
871 if (info_element->qui_type != QOS_OUI_TYPE)
872 return -1;
873 if (info_element->version != QOS_VERSION_1)
874 return -1;
875
876 return 0;
877 }
878
879 /*
880 * Parse a QoS parameter element
881 */
882 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
883 *element_param, struct ieee80211_info_element
884 *info_element)
885 {
886 int ret = 0;
887 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
888
889 if ((info_element == NULL) || (element_param == NULL))
890 return -1;
891
892 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
893 memcpy(element_param->info_element.qui, info_element->data,
894 info_element->len);
895 element_param->info_element.elementID = info_element->id;
896 element_param->info_element.length = info_element->len;
897 } else
898 ret = -1;
899 if (ret == 0)
900 ret = ieee80211_verify_qos_info(&element_param->info_element,
901 QOS_OUI_PARAM_SUB_TYPE);
902 return ret;
903 }
904
905 /*
906 * Parse a QoS information element
907 */
908 static int ieee80211_read_qos_info_element(struct
909 ieee80211_qos_information_element
910 *element_info, struct ieee80211_info_element
911 *info_element)
912 {
913 int ret = 0;
914 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
915
916 if (element_info == NULL)
917 return -1;
918 if (info_element == NULL)
919 return -1;
920
921 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
922 memcpy(element_info->qui, info_element->data,
923 info_element->len);
924 element_info->elementID = info_element->id;
925 element_info->length = info_element->len;
926 } else
927 ret = -1;
928
929 if (ret == 0)
930 ret = ieee80211_verify_qos_info(element_info,
931 QOS_OUI_INFO_SUB_TYPE);
932 return ret;
933 }
934
935 /*
936 * Write QoS parameters from the ac parameters.
937 */
938 static int ieee80211_qos_convert_ac_to_parameters(struct
939 ieee80211_qos_parameter_info
940 *param_elm, struct
941 ieee80211_qos_parameters
942 *qos_param)
943 {
944 int rc = 0;
945 int i;
946 struct ieee80211_qos_ac_parameter *ac_params;
947 u32 txop;
948 u8 cw_min;
949 u8 cw_max;
950
951 for (i = 0; i < QOS_QUEUE_NUM; i++) {
952 ac_params = &(param_elm->ac_params_record[i]);
953
954 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
955 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
956
957 cw_min = ac_params->ecw_min_max & 0x0F;
958 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
959
960 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
961 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
962
963 qos_param->flag[i] =
964 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
965
966 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
967 qos_param->tx_op_limit[i] = (u16) txop;
968 }
969 return rc;
970 }
971
972 /*
973 * we have a generic data element which it may contain QoS information or
974 * parameters element. check the information element length to decide
975 * which type to read
976 */
977 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
978 *info_element,
979 struct ieee80211_network *network)
980 {
981 int rc = 0;
982 struct ieee80211_qos_parameters *qos_param = NULL;
983 struct ieee80211_qos_information_element qos_info_element;
984
985 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
986
987 if (rc == 0) {
988 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
989 network->flags |= NETWORK_HAS_QOS_INFORMATION;
990 } else {
991 struct ieee80211_qos_parameter_info param_element;
992
993 rc = ieee80211_read_qos_param_element(&param_element,
994 info_element);
995 if (rc == 0) {
996 qos_param = &(network->qos_data.parameters);
997 ieee80211_qos_convert_ac_to_parameters(&param_element,
998 qos_param);
999 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1000 network->qos_data.param_count =
1001 param_element.info_element.ac_info & 0x0F;
1002 }
1003 }
1004
1005 if (rc == 0) {
1006 IEEE80211_DEBUG_QOS("QoS is supported\n");
1007 network->qos_data.supported = 1;
1008 }
1009 return rc;
1010 }
1011
1012 #ifdef CONFIG_IEEE80211_DEBUG
1013 #define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1014
1015 static const char *get_info_element_string(u16 id)
1016 {
1017 switch (id) {
1018 MFIE_STRING(SSID);
1019 MFIE_STRING(RATES);
1020 MFIE_STRING(FH_SET);
1021 MFIE_STRING(DS_SET);
1022 MFIE_STRING(CF_SET);
1023 MFIE_STRING(TIM);
1024 MFIE_STRING(IBSS_SET);
1025 MFIE_STRING(COUNTRY);
1026 MFIE_STRING(HOP_PARAMS);
1027 MFIE_STRING(HOP_TABLE);
1028 MFIE_STRING(REQUEST);
1029 MFIE_STRING(CHALLENGE);
1030 MFIE_STRING(POWER_CONSTRAINT);
1031 MFIE_STRING(POWER_CAPABILITY);
1032 MFIE_STRING(TPC_REQUEST);
1033 MFIE_STRING(TPC_REPORT);
1034 MFIE_STRING(SUPP_CHANNELS);
1035 MFIE_STRING(CSA);
1036 MFIE_STRING(MEASURE_REQUEST);
1037 MFIE_STRING(MEASURE_REPORT);
1038 MFIE_STRING(QUIET);
1039 MFIE_STRING(IBSS_DFS);
1040 MFIE_STRING(ERP_INFO);
1041 MFIE_STRING(RSN);
1042 MFIE_STRING(RATES_EX);
1043 MFIE_STRING(GENERIC);
1044 MFIE_STRING(QOS_PARAMETER);
1045 default:
1046 return "UNKNOWN";
1047 }
1048 }
1049 #endif
1050
1051 static int ieee80211_parse_info_param(struct ieee80211_info_element
1052 *info_element, u16 length,
1053 struct ieee80211_network *network)
1054 {
1055 u8 i;
1056 #ifdef CONFIG_IEEE80211_DEBUG
1057 char rates_str[64];
1058 char *p;
1059 #endif
1060
1061 while (length >= sizeof(*info_element)) {
1062 if (sizeof(*info_element) + info_element->len > length) {
1063 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
1064 "info_element->len + 2 > left : "
1065 "info_element->len+2=%zd left=%d, id=%d.\n",
1066 info_element->len +
1067 sizeof(*info_element),
1068 length, info_element->id);
1069 return 1;
1070 }
1071
1072 switch (info_element->id) {
1073 case MFIE_TYPE_SSID:
1074 if (ieee80211_is_empty_essid(info_element->data,
1075 info_element->len)) {
1076 network->flags |= NETWORK_EMPTY_ESSID;
1077 break;
1078 }
1079
1080 network->ssid_len = min(info_element->len,
1081 (u8) IW_ESSID_MAX_SIZE);
1082 memcpy(network->ssid, info_element->data,
1083 network->ssid_len);
1084 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1085 memset(network->ssid + network->ssid_len, 0,
1086 IW_ESSID_MAX_SIZE - network->ssid_len);
1087
1088 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1089 network->ssid, network->ssid_len);
1090 break;
1091
1092 case MFIE_TYPE_RATES:
1093 #ifdef CONFIG_IEEE80211_DEBUG
1094 p = rates_str;
1095 #endif
1096 network->rates_len = min(info_element->len,
1097 MAX_RATES_LENGTH);
1098 for (i = 0; i < network->rates_len; i++) {
1099 network->rates[i] = info_element->data[i];
1100 #ifdef CONFIG_IEEE80211_DEBUG
1101 p += snprintf(p, sizeof(rates_str) -
1102 (p - rates_str), "%02X ",
1103 network->rates[i]);
1104 #endif
1105 if (ieee80211_is_ofdm_rate
1106 (info_element->data[i])) {
1107 network->flags |= NETWORK_HAS_OFDM;
1108 if (info_element->data[i] &
1109 IEEE80211_BASIC_RATE_MASK)
1110 network->flags &=
1111 ~NETWORK_HAS_CCK;
1112 }
1113 }
1114
1115 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1116 rates_str, network->rates_len);
1117 break;
1118
1119 case MFIE_TYPE_RATES_EX:
1120 #ifdef CONFIG_IEEE80211_DEBUG
1121 p = rates_str;
1122 #endif
1123 network->rates_ex_len = min(info_element->len,
1124 MAX_RATES_EX_LENGTH);
1125 for (i = 0; i < network->rates_ex_len; i++) {
1126 network->rates_ex[i] = info_element->data[i];
1127 #ifdef CONFIG_IEEE80211_DEBUG
1128 p += snprintf(p, sizeof(rates_str) -
1129 (p - rates_str), "%02X ",
1130 network->rates[i]);
1131 #endif
1132 if (ieee80211_is_ofdm_rate
1133 (info_element->data[i])) {
1134 network->flags |= NETWORK_HAS_OFDM;
1135 if (info_element->data[i] &
1136 IEEE80211_BASIC_RATE_MASK)
1137 network->flags &=
1138 ~NETWORK_HAS_CCK;
1139 }
1140 }
1141
1142 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1143 rates_str, network->rates_ex_len);
1144 break;
1145
1146 case MFIE_TYPE_DS_SET:
1147 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1148 info_element->data[0]);
1149 network->channel = info_element->data[0];
1150 break;
1151
1152 case MFIE_TYPE_FH_SET:
1153 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1154 break;
1155
1156 case MFIE_TYPE_CF_SET:
1157 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1158 break;
1159
1160 case MFIE_TYPE_TIM:
1161 network->tim.tim_count = info_element->data[0];
1162 network->tim.tim_period = info_element->data[1];
1163 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: partially ignored\n");
1164 break;
1165
1166 case MFIE_TYPE_ERP_INFO:
1167 network->erp_value = info_element->data[0];
1168 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1169 network->erp_value);
1170 break;
1171
1172 case MFIE_TYPE_IBSS_SET:
1173 network->atim_window = info_element->data[0];
1174 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1175 network->atim_window);
1176 break;
1177
1178 case MFIE_TYPE_CHALLENGE:
1179 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1180 break;
1181
1182 case MFIE_TYPE_GENERIC:
1183 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1184 info_element->len);
1185 if (!ieee80211_parse_qos_info_param_IE(info_element,
1186 network))
1187 break;
1188
1189 if (info_element->len >= 4 &&
1190 info_element->data[0] == 0x00 &&
1191 info_element->data[1] == 0x50 &&
1192 info_element->data[2] == 0xf2 &&
1193 info_element->data[3] == 0x01) {
1194 network->wpa_ie_len = min(info_element->len + 2,
1195 MAX_WPA_IE_LEN);
1196 memcpy(network->wpa_ie, info_element,
1197 network->wpa_ie_len);
1198 }
1199 break;
1200
1201 case MFIE_TYPE_RSN:
1202 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1203 info_element->len);
1204 network->rsn_ie_len = min(info_element->len + 2,
1205 MAX_WPA_IE_LEN);
1206 memcpy(network->rsn_ie, info_element,
1207 network->rsn_ie_len);
1208 break;
1209
1210 case MFIE_TYPE_QOS_PARAMETER:
1211 printk(KERN_ERR
1212 "QoS Error need to parse QOS_PARAMETER IE\n");
1213 break;
1214 /* 802.11h */
1215 case MFIE_TYPE_POWER_CONSTRAINT:
1216 network->power_constraint = info_element->data[0];
1217 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1218 break;
1219
1220 case MFIE_TYPE_CSA:
1221 network->power_constraint = info_element->data[0];
1222 network->flags |= NETWORK_HAS_CSA;
1223 break;
1224
1225 case MFIE_TYPE_QUIET:
1226 network->quiet.count = info_element->data[0];
1227 network->quiet.period = info_element->data[1];
1228 network->quiet.duration = info_element->data[2];
1229 network->quiet.offset = info_element->data[3];
1230 network->flags |= NETWORK_HAS_QUIET;
1231 break;
1232
1233 case MFIE_TYPE_IBSS_DFS:
1234 if (network->ibss_dfs)
1235 break;
1236 network->ibss_dfs =
1237 kmalloc(info_element->len, GFP_ATOMIC);
1238 if (!network->ibss_dfs)
1239 return 1;
1240 memcpy(network->ibss_dfs, info_element->data,
1241 info_element->len);
1242 network->flags |= NETWORK_HAS_IBSS_DFS;
1243 break;
1244
1245 case MFIE_TYPE_TPC_REPORT:
1246 network->tpc_report.transmit_power =
1247 info_element->data[0];
1248 network->tpc_report.link_margin = info_element->data[1];
1249 network->flags |= NETWORK_HAS_TPC_REPORT;
1250 break;
1251
1252 default:
1253 IEEE80211_DEBUG_MGMT
1254 ("Unsupported info element: %s (%d)\n",
1255 get_info_element_string(info_element->id),
1256 info_element->id);
1257 break;
1258 }
1259
1260 length -= sizeof(*info_element) + info_element->len;
1261 info_element =
1262 (struct ieee80211_info_element *)&info_element->
1263 data[info_element->len];
1264 }
1265
1266 return 0;
1267 }
1268
1269 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1270 *frame, struct ieee80211_rx_stats *stats)
1271 {
1272 struct ieee80211_network network_resp = {
1273 .ibss_dfs = NULL,
1274 };
1275 struct ieee80211_network *network = &network_resp;
1276 struct net_device *dev = ieee->dev;
1277
1278 network->flags = 0;
1279 network->qos_data.active = 0;
1280 network->qos_data.supported = 0;
1281 network->qos_data.param_count = 0;
1282 network->qos_data.old_param_count = 0;
1283
1284 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1285 network->atim_window = le16_to_cpu(frame->aid);
1286 network->listen_interval = le16_to_cpu(frame->status);
1287 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1288 network->capability = le16_to_cpu(frame->capability);
1289 network->last_scanned = jiffies;
1290 network->rates_len = network->rates_ex_len = 0;
1291 network->last_associate = 0;
1292 network->ssid_len = 0;
1293 network->erp_value =
1294 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1295
1296 if (stats->freq == IEEE80211_52GHZ_BAND) {
1297 /* for A band (No DS info) */
1298 network->channel = stats->received_channel;
1299 } else
1300 network->flags |= NETWORK_HAS_CCK;
1301
1302 network->wpa_ie_len = 0;
1303 network->rsn_ie_len = 0;
1304
1305 if (ieee80211_parse_info_param
1306 (frame->info_element, stats->len - sizeof(*frame), network))
1307 return 1;
1308
1309 network->mode = 0;
1310 if (stats->freq == IEEE80211_52GHZ_BAND)
1311 network->mode = IEEE_A;
1312 else {
1313 if (network->flags & NETWORK_HAS_OFDM)
1314 network->mode |= IEEE_G;
1315 if (network->flags & NETWORK_HAS_CCK)
1316 network->mode |= IEEE_B;
1317 }
1318
1319 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1320 network->flags |= NETWORK_EMPTY_ESSID;
1321
1322 memcpy(&network->stats, stats, sizeof(network->stats));
1323
1324 if (ieee->handle_assoc_response != NULL)
1325 ieee->handle_assoc_response(dev, frame, network);
1326
1327 return 0;
1328 }
1329
1330 /***************************************************/
1331
1332 static int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1333 *beacon,
1334 struct ieee80211_network *network,
1335 struct ieee80211_rx_stats *stats)
1336 {
1337 network->qos_data.active = 0;
1338 network->qos_data.supported = 0;
1339 network->qos_data.param_count = 0;
1340 network->qos_data.old_param_count = 0;
1341
1342 /* Pull out fixed field data */
1343 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1344 network->capability = le16_to_cpu(beacon->capability);
1345 network->last_scanned = jiffies;
1346 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1347 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1348 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1349 /* Where to pull this? beacon->listen_interval; */
1350 network->listen_interval = 0x0A;
1351 network->rates_len = network->rates_ex_len = 0;
1352 network->last_associate = 0;
1353 network->ssid_len = 0;
1354 network->flags = 0;
1355 network->atim_window = 0;
1356 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1357 0x3 : 0x0;
1358
1359 if (stats->freq == IEEE80211_52GHZ_BAND) {
1360 /* for A band (No DS info) */
1361 network->channel = stats->received_channel;
1362 } else
1363 network->flags |= NETWORK_HAS_CCK;
1364
1365 network->wpa_ie_len = 0;
1366 network->rsn_ie_len = 0;
1367
1368 if (ieee80211_parse_info_param
1369 (beacon->info_element, stats->len - sizeof(*beacon), network))
1370 return 1;
1371
1372 network->mode = 0;
1373 if (stats->freq == IEEE80211_52GHZ_BAND)
1374 network->mode = IEEE_A;
1375 else {
1376 if (network->flags & NETWORK_HAS_OFDM)
1377 network->mode |= IEEE_G;
1378 if (network->flags & NETWORK_HAS_CCK)
1379 network->mode |= IEEE_B;
1380 }
1381
1382 if (network->mode == 0) {
1383 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1384 "network.\n",
1385 escape_essid(network->ssid,
1386 network->ssid_len),
1387 MAC_ARG(network->bssid));
1388 return 1;
1389 }
1390
1391 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1392 network->flags |= NETWORK_EMPTY_ESSID;
1393
1394 memcpy(&network->stats, stats, sizeof(network->stats));
1395
1396 return 0;
1397 }
1398
1399 static inline int is_same_network(struct ieee80211_network *src,
1400 struct ieee80211_network *dst)
1401 {
1402 /* A network is only a duplicate if the channel, BSSID, and ESSID
1403 * all match. We treat all <hidden> with the same BSSID and channel
1404 * as one network */
1405 return ((src->ssid_len == dst->ssid_len) &&
1406 (src->channel == dst->channel) &&
1407 !compare_ether_addr(src->bssid, dst->bssid) &&
1408 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1409 }
1410
1411 static void update_network(struct ieee80211_network *dst,
1412 struct ieee80211_network *src)
1413 {
1414 int qos_active;
1415 u8 old_param;
1416
1417 ieee80211_network_reset(dst);
1418 dst->ibss_dfs = src->ibss_dfs;
1419
1420 /* We only update the statistics if they were created by receiving
1421 * the network information on the actual channel the network is on.
1422 *
1423 * This keeps beacons received on neighbor channels from bringing
1424 * down the signal level of an AP. */
1425 if (dst->channel == src->stats.received_channel)
1426 memcpy(&dst->stats, &src->stats,
1427 sizeof(struct ieee80211_rx_stats));
1428 else
1429 IEEE80211_DEBUG_SCAN("Network " MAC_FMT " info received "
1430 "off channel (%d vs. %d)\n", MAC_ARG(src->bssid),
1431 dst->channel, src->stats.received_channel);
1432
1433 dst->capability = src->capability;
1434 memcpy(dst->rates, src->rates, src->rates_len);
1435 dst->rates_len = src->rates_len;
1436 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1437 dst->rates_ex_len = src->rates_ex_len;
1438
1439 dst->mode = src->mode;
1440 dst->flags = src->flags;
1441 dst->time_stamp[0] = src->time_stamp[0];
1442 dst->time_stamp[1] = src->time_stamp[1];
1443
1444 dst->beacon_interval = src->beacon_interval;
1445 dst->listen_interval = src->listen_interval;
1446 dst->atim_window = src->atim_window;
1447 dst->erp_value = src->erp_value;
1448 dst->tim = src->tim;
1449
1450 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1451 dst->wpa_ie_len = src->wpa_ie_len;
1452 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1453 dst->rsn_ie_len = src->rsn_ie_len;
1454
1455 dst->last_scanned = jiffies;
1456 qos_active = src->qos_data.active;
1457 old_param = dst->qos_data.old_param_count;
1458 if (dst->flags & NETWORK_HAS_QOS_MASK)
1459 memcpy(&dst->qos_data, &src->qos_data,
1460 sizeof(struct ieee80211_qos_data));
1461 else {
1462 dst->qos_data.supported = src->qos_data.supported;
1463 dst->qos_data.param_count = src->qos_data.param_count;
1464 }
1465
1466 if (dst->qos_data.supported == 1) {
1467 if (dst->ssid_len)
1468 IEEE80211_DEBUG_QOS
1469 ("QoS the network %s is QoS supported\n",
1470 dst->ssid);
1471 else
1472 IEEE80211_DEBUG_QOS
1473 ("QoS the network is QoS supported\n");
1474 }
1475 dst->qos_data.active = qos_active;
1476 dst->qos_data.old_param_count = old_param;
1477
1478 /* dst->last_associate is not overwritten */
1479 }
1480
1481 static inline int is_beacon(__le16 fc)
1482 {
1483 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1484 }
1485
1486 static void ieee80211_process_probe_response(struct ieee80211_device
1487 *ieee, struct
1488 ieee80211_probe_response
1489 *beacon, struct ieee80211_rx_stats
1490 *stats)
1491 {
1492 struct net_device *dev = ieee->dev;
1493 struct ieee80211_network network = {
1494 .ibss_dfs = NULL,
1495 };
1496 struct ieee80211_network *target;
1497 struct ieee80211_network *oldest = NULL;
1498 #ifdef CONFIG_IEEE80211_DEBUG
1499 struct ieee80211_info_element *info_element = beacon->info_element;
1500 #endif
1501 unsigned long flags;
1502
1503 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1504 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1505 escape_essid(info_element->data,
1506 info_element->len),
1507 MAC_ARG(beacon->header.addr3),
1508 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1509 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1510 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1511 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1512 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1513 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1514 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1515 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1516 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1517 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1518 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1519 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1520 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1521 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1522 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1523 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1524
1525 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1526 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1527 escape_essid(info_element->data,
1528 info_element->len),
1529 MAC_ARG(beacon->header.addr3),
1530 is_beacon(beacon->header.frame_ctl) ?
1531 "BEACON" : "PROBE RESPONSE");
1532 return;
1533 }
1534
1535 /* The network parsed correctly -- so now we scan our known networks
1536 * to see if we can find it in our list.
1537 *
1538 * NOTE: This search is definitely not optimized. Once its doing
1539 * the "right thing" we'll optimize it for efficiency if
1540 * necessary */
1541
1542 /* Search for this entry in the list and update it if it is
1543 * already there. */
1544
1545 spin_lock_irqsave(&ieee->lock, flags);
1546
1547 list_for_each_entry(target, &ieee->network_list, list) {
1548 if (is_same_network(target, &network))
1549 break;
1550
1551 if ((oldest == NULL) ||
1552 (target->last_scanned < oldest->last_scanned))
1553 oldest = target;
1554 }
1555
1556 /* If we didn't find a match, then get a new network slot to initialize
1557 * with this beacon's information */
1558 if (&target->list == &ieee->network_list) {
1559 if (list_empty(&ieee->network_free_list)) {
1560 /* If there are no more slots, expire the oldest */
1561 list_del(&oldest->list);
1562 target = oldest;
1563 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1564 "network list.\n",
1565 escape_essid(target->ssid,
1566 target->ssid_len),
1567 MAC_ARG(target->bssid));
1568 ieee80211_network_reset(target);
1569 } else {
1570 /* Otherwise just pull from the free list */
1571 target = list_entry(ieee->network_free_list.next,
1572 struct ieee80211_network, list);
1573 list_del(ieee->network_free_list.next);
1574 }
1575
1576 #ifdef CONFIG_IEEE80211_DEBUG
1577 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1578 escape_essid(network.ssid,
1579 network.ssid_len),
1580 MAC_ARG(network.bssid),
1581 is_beacon(beacon->header.frame_ctl) ?
1582 "BEACON" : "PROBE RESPONSE");
1583 #endif
1584 memcpy(target, &network, sizeof(*target));
1585 network.ibss_dfs = NULL;
1586 list_add_tail(&target->list, &ieee->network_list);
1587 } else {
1588 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1589 escape_essid(target->ssid,
1590 target->ssid_len),
1591 MAC_ARG(target->bssid),
1592 is_beacon(beacon->header.frame_ctl) ?
1593 "BEACON" : "PROBE RESPONSE");
1594 update_network(target, &network);
1595 network.ibss_dfs = NULL;
1596 }
1597
1598 spin_unlock_irqrestore(&ieee->lock, flags);
1599
1600 if (is_beacon(beacon->header.frame_ctl)) {
1601 if (ieee->handle_beacon != NULL)
1602 ieee->handle_beacon(dev, beacon, target);
1603 } else {
1604 if (ieee->handle_probe_response != NULL)
1605 ieee->handle_probe_response(dev, beacon, target);
1606 }
1607 }
1608
1609 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1610 struct ieee80211_hdr_4addr *header,
1611 struct ieee80211_rx_stats *stats)
1612 {
1613 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1614 case IEEE80211_STYPE_ASSOC_RESP:
1615 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1616 WLAN_FC_GET_STYPE(le16_to_cpu
1617 (header->frame_ctl)));
1618 ieee80211_handle_assoc_resp(ieee,
1619 (struct ieee80211_assoc_response *)
1620 header, stats);
1621 break;
1622
1623 case IEEE80211_STYPE_REASSOC_RESP:
1624 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1625 WLAN_FC_GET_STYPE(le16_to_cpu
1626 (header->frame_ctl)));
1627 break;
1628
1629 case IEEE80211_STYPE_PROBE_REQ:
1630 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1631 WLAN_FC_GET_STYPE(le16_to_cpu
1632 (header->frame_ctl)));
1633
1634 if (ieee->handle_probe_request != NULL)
1635 ieee->handle_probe_request(ieee->dev,
1636 (struct
1637 ieee80211_probe_request *)
1638 header, stats);
1639 break;
1640
1641 case IEEE80211_STYPE_PROBE_RESP:
1642 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1643 WLAN_FC_GET_STYPE(le16_to_cpu
1644 (header->frame_ctl)));
1645 IEEE80211_DEBUG_SCAN("Probe response\n");
1646 ieee80211_process_probe_response(ieee,
1647 (struct
1648 ieee80211_probe_response *)
1649 header, stats);
1650 break;
1651
1652 case IEEE80211_STYPE_BEACON:
1653 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1654 WLAN_FC_GET_STYPE(le16_to_cpu
1655 (header->frame_ctl)));
1656 IEEE80211_DEBUG_SCAN("Beacon\n");
1657 ieee80211_process_probe_response(ieee,
1658 (struct
1659 ieee80211_probe_response *)
1660 header, stats);
1661 break;
1662 case IEEE80211_STYPE_AUTH:
1663
1664 IEEE80211_DEBUG_MGMT("received auth (%d)\n",
1665 WLAN_FC_GET_STYPE(le16_to_cpu
1666 (header->frame_ctl)));
1667
1668 if (ieee->handle_auth != NULL)
1669 ieee->handle_auth(ieee->dev,
1670 (struct ieee80211_auth *)header);
1671 break;
1672
1673 case IEEE80211_STYPE_DISASSOC:
1674 if (ieee->handle_disassoc != NULL)
1675 ieee->handle_disassoc(ieee->dev,
1676 (struct ieee80211_disassoc *)
1677 header);
1678 break;
1679
1680 case IEEE80211_STYPE_ACTION:
1681 IEEE80211_DEBUG_MGMT("ACTION\n");
1682 if (ieee->handle_action)
1683 ieee->handle_action(ieee->dev,
1684 (struct ieee80211_action *)
1685 header, stats);
1686 break;
1687
1688 case IEEE80211_STYPE_REASSOC_REQ:
1689 IEEE80211_DEBUG_MGMT("received reassoc (%d)\n",
1690 WLAN_FC_GET_STYPE(le16_to_cpu
1691 (header->frame_ctl)));
1692
1693 IEEE80211_DEBUG_MGMT("%s: IEEE80211_REASSOC_REQ received\n",
1694 ieee->dev->name);
1695 if (ieee->handle_reassoc_request != NULL)
1696 ieee->handle_reassoc_request(ieee->dev,
1697 (struct ieee80211_reassoc_request *)
1698 header);
1699 break;
1700
1701 case IEEE80211_STYPE_ASSOC_REQ:
1702 IEEE80211_DEBUG_MGMT("received assoc (%d)\n",
1703 WLAN_FC_GET_STYPE(le16_to_cpu
1704 (header->frame_ctl)));
1705
1706 IEEE80211_DEBUG_MGMT("%s: IEEE80211_ASSOC_REQ received\n",
1707 ieee->dev->name);
1708 if (ieee->handle_assoc_request != NULL)
1709 ieee->handle_assoc_request(ieee->dev);
1710 break;
1711
1712 case IEEE80211_STYPE_DEAUTH:
1713 IEEE80211_DEBUG_MGMT("DEAUTH\n");
1714 if (ieee->handle_deauth != NULL)
1715 ieee->handle_deauth(ieee->dev,
1716 (struct ieee80211_deauth *)
1717 header);
1718 break;
1719 default:
1720 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1721 WLAN_FC_GET_STYPE(le16_to_cpu
1722 (header->frame_ctl)));
1723 IEEE80211_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1724 ieee->dev->name,
1725 WLAN_FC_GET_STYPE(le16_to_cpu
1726 (header->frame_ctl)));
1727 break;
1728 }
1729 }
1730
1731 EXPORT_SYMBOL(ieee80211_rx_mgt);
1732 EXPORT_SYMBOL(ieee80211_rx);
linux kernel for loongson