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[PATCH] fix NET_RADIO=n, IEEE80211=y compile
[linux-2.6/linux-2.6-openrd.git] / net / ieee80211 / ieee80211_rx.c
blob00eb780836d838b420529c6a1d15efb14512aa3a
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/version.h>
32 #include <linux/wireless.h>
33 #include <linux/etherdevice.h>
34 #include <asm/uaccess.h>
35 #include <linux/ctype.h>
36
37 #include <net/ieee80211.h>
38
39 static inline void ieee80211_monitor_rx(struct ieee80211_device *ieee,
40 struct sk_buff *skb,
41 struct ieee80211_rx_stats *rx_stats)
42 {
43 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
44 u16 fc = le16_to_cpu(hdr->frame_ctl);
45
46 skb->dev = ieee->dev;
47 skb->mac.raw = skb->data;
48 skb_pull(skb, ieee80211_get_hdrlen(fc));
49 skb->pkt_type = PACKET_OTHERHOST;
50 skb->protocol = __constant_htons(ETH_P_80211_RAW);
51 memset(skb->cb, 0, sizeof(skb->cb));
52 netif_rx(skb);
53 }
54
55 /* Called only as a tasklet (software IRQ) */
56 static struct ieee80211_frag_entry *ieee80211_frag_cache_find(struct
57 ieee80211_device
58 *ieee,
59 unsigned int seq,
60 unsigned int frag,
61 u8 * src,
62 u8 * dst)
63 {
64 struct ieee80211_frag_entry *entry;
65 int i;
66
67 for (i = 0; i < IEEE80211_FRAG_CACHE_LEN; i++) {
68 entry = &ieee->frag_cache[i];
69 if (entry->skb != NULL &&
70 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
71 IEEE80211_DEBUG_FRAG("expiring fragment cache entry "
72 "seq=%u last_frag=%u\n",
73 entry->seq, entry->last_frag);
74 dev_kfree_skb_any(entry->skb);
75 entry->skb = NULL;
76 }
77
78 if (entry->skb != NULL && entry->seq == seq &&
79 (entry->last_frag + 1 == frag || frag == -1) &&
80 memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
81 memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
82 return entry;
83 }
84
85 return NULL;
86 }
87
88 /* Called only as a tasklet (software IRQ) */
89 static struct sk_buff *ieee80211_frag_cache_get(struct ieee80211_device *ieee,
90 struct ieee80211_hdr_4addr *hdr)
91 {
92 struct sk_buff *skb = NULL;
93 u16 sc;
94 unsigned int frag, seq;
95 struct ieee80211_frag_entry *entry;
96
97 sc = le16_to_cpu(hdr->seq_ctl);
98 frag = WLAN_GET_SEQ_FRAG(sc);
99 seq = WLAN_GET_SEQ_SEQ(sc);
100
101 if (frag == 0) {
102 /* Reserve enough space to fit maximum frame length */
103 skb = dev_alloc_skb(ieee->dev->mtu +
104 sizeof(struct ieee80211_hdr_4addr) +
105 8 /* LLC */ +
106 2 /* alignment */ +
107 8 /* WEP */ + ETH_ALEN /* WDS */ );
108 if (skb == NULL)
109 return NULL;
110
111 entry = &ieee->frag_cache[ieee->frag_next_idx];
112 ieee->frag_next_idx++;
113 if (ieee->frag_next_idx >= IEEE80211_FRAG_CACHE_LEN)
114 ieee->frag_next_idx = 0;
115
116 if (entry->skb != NULL)
117 dev_kfree_skb_any(entry->skb);
118
119 entry->first_frag_time = jiffies;
120 entry->seq = seq;
121 entry->last_frag = frag;
122 entry->skb = skb;
123 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
124 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
125 } else {
126 /* received a fragment of a frame for which the head fragment
127 * should have already been received */
128 entry = ieee80211_frag_cache_find(ieee, seq, frag, hdr->addr2,
129 hdr->addr1);
130 if (entry != NULL) {
131 entry->last_frag = frag;
132 skb = entry->skb;
133 }
134 }
135
136 return skb;
137 }
138
139 /* Called only as a tasklet (software IRQ) */
140 static int ieee80211_frag_cache_invalidate(struct ieee80211_device *ieee,
141 struct ieee80211_hdr_4addr *hdr)
142 {
143 u16 sc;
144 unsigned int seq;
145 struct ieee80211_frag_entry *entry;
146
147 sc = le16_to_cpu(hdr->seq_ctl);
148 seq = WLAN_GET_SEQ_SEQ(sc);
149
150 entry = ieee80211_frag_cache_find(ieee, seq, -1, hdr->addr2,
151 hdr->addr1);
152
153 if (entry == NULL) {
154 IEEE80211_DEBUG_FRAG("could not invalidate fragment cache "
155 "entry (seq=%u)\n", seq);
156 return -1;
157 }
158
159 entry->skb = NULL;
160 return 0;
161 }
162
163 #ifdef NOT_YET
164 /* ieee80211_rx_frame_mgtmt
165 *
166 * Responsible for handling management control frames
167 *
168 * Called by ieee80211_rx */
169 static inline int
170 ieee80211_rx_frame_mgmt(struct ieee80211_device *ieee, struct sk_buff *skb,
171 struct ieee80211_rx_stats *rx_stats, u16 type,
172 u16 stype)
173 {
174 if (ieee->iw_mode == IW_MODE_MASTER) {
175 printk(KERN_DEBUG "%s: Master mode not yet suppported.\n",
176 ieee->dev->name);
177 return 0;
178 /*
179 hostap_update_sta_ps(ieee, (struct hostap_ieee80211_hdr_4addr *)
180 skb->data);*/
181 }
182
183 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
184 if (stype == WLAN_FC_STYPE_BEACON &&
185 ieee->iw_mode == IW_MODE_MASTER) {
186 struct sk_buff *skb2;
187 /* Process beacon frames also in kernel driver to
188 * update STA(AP) table statistics */
189 skb2 = skb_clone(skb, GFP_ATOMIC);
190 if (skb2)
191 hostap_rx(skb2->dev, skb2, rx_stats);
192 }
193
194 /* send management frames to the user space daemon for
195 * processing */
196 ieee->apdevstats.rx_packets++;
197 ieee->apdevstats.rx_bytes += skb->len;
198 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
199 return 0;
200 }
201
202 if (ieee->iw_mode == IW_MODE_MASTER) {
203 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
204 printk(KERN_DEBUG "%s: unknown management frame "
205 "(type=0x%02x, stype=0x%02x) dropped\n",
206 skb->dev->name, type, stype);
207 return -1;
208 }
209
210 hostap_rx(skb->dev, skb, rx_stats);
211 return 0;
212 }
213
214 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
215 "received in non-Host AP mode\n", skb->dev->name);
216 return -1;
217 }
218 #endif
219
220 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
221 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
222 static unsigned char rfc1042_header[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
223
224 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
225 static unsigned char bridge_tunnel_header[] =
226 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
227 /* No encapsulation header if EtherType < 0x600 (=length) */
228
229 /* Called by ieee80211_rx_frame_decrypt */
230 static int ieee80211_is_eapol_frame(struct ieee80211_device *ieee,
231 struct sk_buff *skb)
232 {
233 struct net_device *dev = ieee->dev;
234 u16 fc, ethertype;
235 struct ieee80211_hdr_3addr *hdr;
236 u8 *pos;
237
238 if (skb->len < 24)
239 return 0;
240
241 hdr = (struct ieee80211_hdr_3addr *)skb->data;
242 fc = le16_to_cpu(hdr->frame_ctl);
243
244 /* check that the frame is unicast frame to us */
245 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
246 IEEE80211_FCTL_TODS &&
247 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
248 memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
249 /* ToDS frame with own addr BSSID and DA */
250 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
251 IEEE80211_FCTL_FROMDS &&
252 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
253 /* FromDS frame with own addr as DA */
254 } else
255 return 0;
256
257 if (skb->len < 24 + 8)
258 return 0;
259
260 /* check for port access entity Ethernet type */
261 pos = skb->data + 24;
262 ethertype = (pos[6] << 8) | pos[7];
263 if (ethertype == ETH_P_PAE)
264 return 1;
265
266 return 0;
267 }
268
269 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
270 static inline int
271 ieee80211_rx_frame_decrypt(struct ieee80211_device *ieee, struct sk_buff *skb,
272 struct ieee80211_crypt_data *crypt)
273 {
274 struct ieee80211_hdr_3addr *hdr;
275 int res, hdrlen;
276
277 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
278 return 0;
279
280 hdr = (struct ieee80211_hdr_3addr *)skb->data;
281 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
282
283 atomic_inc(&crypt->refcnt);
284 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
285 atomic_dec(&crypt->refcnt);
286 if (res < 0) {
287 IEEE80211_DEBUG_DROP("decryption failed (SA=" MAC_FMT
288 ") res=%d\n", MAC_ARG(hdr->addr2), res);
289 if (res == -2)
290 IEEE80211_DEBUG_DROP("Decryption failed ICV "
291 "mismatch (key %d)\n",
292 skb->data[hdrlen + 3] >> 6);
293 ieee->ieee_stats.rx_discards_undecryptable++;
294 return -1;
295 }
296
297 return res;
298 }
299
300 /* Called only as a tasklet (software IRQ), by ieee80211_rx */
301 static inline int
302 ieee80211_rx_frame_decrypt_msdu(struct ieee80211_device *ieee,
303 struct sk_buff *skb, int keyidx,
304 struct ieee80211_crypt_data *crypt)
305 {
306 struct ieee80211_hdr_3addr *hdr;
307 int res, hdrlen;
308
309 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
310 return 0;
311
312 hdr = (struct ieee80211_hdr_3addr *)skb->data;
313 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
314
315 atomic_inc(&crypt->refcnt);
316 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
317 atomic_dec(&crypt->refcnt);
318 if (res < 0) {
319 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
320 " (SA=" MAC_FMT " keyidx=%d)\n",
321 ieee->dev->name, MAC_ARG(hdr->addr2), keyidx);
322 return -1;
323 }
324
325 return 0;
326 }
327
328 /* All received frames are sent to this function. @skb contains the frame in
329 * IEEE 802.11 format, i.e., in the format it was sent over air.
330 * This function is called only as a tasklet (software IRQ). */
331 int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
332 struct ieee80211_rx_stats *rx_stats)
333 {
334 struct net_device *dev = ieee->dev;
335 struct ieee80211_hdr_4addr *hdr;
336 size_t hdrlen;
337 u16 fc, type, stype, sc;
338 struct net_device_stats *stats;
339 unsigned int frag;
340 u8 *payload;
341 u16 ethertype;
342 #ifdef NOT_YET
343 struct net_device *wds = NULL;
344 struct sk_buff *skb2 = NULL;
345 struct net_device *wds = NULL;
346 int frame_authorized = 0;
347 int from_assoc_ap = 0;
348 void *sta = NULL;
349 #endif
350 u8 dst[ETH_ALEN];
351 u8 src[ETH_ALEN];
352 struct ieee80211_crypt_data *crypt = NULL;
353 int keyidx = 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 #ifdef CONFIG_NET_RADIO
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 /* CONFIG_NET_RADIO */
401 #endif /* IW_WIRELESS_SPY */
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 if ((is_multicast_ether_addr(hdr->addr1) ||
415 is_broadcast_ether_addr(hdr->addr2)) ? ieee->host_mc_decrypt :
416 ieee->host_decrypt) {
417 int idx = 0;
418 if (skb->len >= hdrlen + 3)
419 idx = skb->data[hdrlen + 3] >> 6;
420 crypt = ieee->crypt[idx];
421 #ifdef NOT_YET
422 sta = NULL;
423
424 /* Use station specific key to override default keys if the
425 * receiver address is a unicast address ("individual RA"). If
426 * bcrx_sta_key parameter is set, station specific key is used
427 * even with broad/multicast targets (this is against IEEE
428 * 802.11, but makes it easier to use different keys with
429 * stations that do not support WEP key mapping). */
430
431 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
432 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
433 &sta);
434 #endif
435
436 /* allow NULL decrypt to indicate an station specific override
437 * for default encryption */
438 if (crypt && (crypt->ops == NULL ||
439 crypt->ops->decrypt_mpdu == NULL))
440 crypt = NULL;
441
442 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
443 /* This seems to be triggered by some (multicast?)
444 * frames from other than current BSS, so just drop the
445 * frames silently instead of filling system log with
446 * these reports. */
447 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
448 " (SA=" MAC_FMT ")\n",
449 MAC_ARG(hdr->addr2));
450 ieee->ieee_stats.rx_discards_undecryptable++;
451 goto rx_dropped;
452 }
453 }
454 #ifdef NOT_YET
455 if (type != WLAN_FC_TYPE_DATA) {
456 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
457 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
458 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
459 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
460 "from " MAC_FMT "\n", dev->name,
461 MAC_ARG(hdr->addr2));
462 /* TODO: could inform hostapd about this so that it
463 * could send auth failure report */
464 goto rx_dropped;
465 }
466
467 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
468 goto rx_dropped;
469 else
470 goto rx_exit;
471 }
472 #endif
473
474 /* Data frame - extract src/dst addresses */
475 if (skb->len < IEEE80211_3ADDR_LEN)
476 goto rx_dropped;
477
478 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
479 case IEEE80211_FCTL_FROMDS:
480 memcpy(dst, hdr->addr1, ETH_ALEN);
481 memcpy(src, hdr->addr3, ETH_ALEN);
482 break;
483 case IEEE80211_FCTL_TODS:
484 memcpy(dst, hdr->addr3, ETH_ALEN);
485 memcpy(src, hdr->addr2, ETH_ALEN);
486 break;
487 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
488 if (skb->len < IEEE80211_4ADDR_LEN)
489 goto rx_dropped;
490 memcpy(dst, hdr->addr3, ETH_ALEN);
491 memcpy(src, hdr->addr4, ETH_ALEN);
492 break;
493 case 0:
494 memcpy(dst, hdr->addr1, ETH_ALEN);
495 memcpy(src, hdr->addr2, ETH_ALEN);
496 break;
497 }
498
499 #ifdef NOT_YET
500 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
501 goto rx_dropped;
502 if (wds) {
503 skb->dev = dev = wds;
504 stats = hostap_get_stats(dev);
505 }
506
507 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
508 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
509 IEEE80211_FCTL_FROMDS && ieee->stadev
510 && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
511 /* Frame from BSSID of the AP for which we are a client */
512 skb->dev = dev = ieee->stadev;
513 stats = hostap_get_stats(dev);
514 from_assoc_ap = 1;
515 }
516 #endif
517
518 dev->last_rx = jiffies;
519
520 #ifdef NOT_YET
521 if ((ieee->iw_mode == IW_MODE_MASTER ||
522 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
523 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
524 wds != NULL)) {
525 case AP_RX_CONTINUE_NOT_AUTHORIZED:
526 frame_authorized = 0;
527 break;
528 case AP_RX_CONTINUE:
529 frame_authorized = 1;
530 break;
531 case AP_RX_DROP:
532 goto rx_dropped;
533 case AP_RX_EXIT:
534 goto rx_exit;
535 }
536 }
537 #endif
538
539 /* Nullfunc frames may have PS-bit set, so they must be passed to
540 * hostap_handle_sta_rx() before being dropped here. */
541
542 stype &= ~IEEE80211_STYPE_QOS_DATA;
543
544 if (stype != IEEE80211_STYPE_DATA &&
545 stype != IEEE80211_STYPE_DATA_CFACK &&
546 stype != IEEE80211_STYPE_DATA_CFPOLL &&
547 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
548 if (stype != IEEE80211_STYPE_NULLFUNC)
549 IEEE80211_DEBUG_DROP("RX: dropped data frame "
550 "with no data (type=0x%02x, "
551 "subtype=0x%02x, len=%d)\n",
552 type, stype, skb->len);
553 goto rx_dropped;
554 }
555
556 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
557
558 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
559 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
560 goto rx_dropped;
561
562 hdr = (struct ieee80211_hdr_4addr *)skb->data;
563
564 /* skb: hdr + (possibly fragmented) plaintext payload */
565 // PR: FIXME: hostap has additional conditions in the "if" below:
566 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
567 if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
568 int flen;
569 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
570 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
571
572 if (!frag_skb) {
573 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
574 "Rx cannot get skb from fragment "
575 "cache (morefrag=%d seq=%u frag=%u)\n",
576 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
577 WLAN_GET_SEQ_SEQ(sc), frag);
578 goto rx_dropped;
579 }
580
581 flen = skb->len;
582 if (frag != 0)
583 flen -= hdrlen;
584
585 if (frag_skb->tail + flen > frag_skb->end) {
586 printk(KERN_WARNING "%s: host decrypted and "
587 "reassembled frame did not fit skb\n",
588 dev->name);
589 ieee80211_frag_cache_invalidate(ieee, hdr);
590 goto rx_dropped;
591 }
592
593 if (frag == 0) {
594 /* copy first fragment (including full headers) into
595 * beginning of the fragment cache skb */
596 memcpy(skb_put(frag_skb, flen), skb->data, flen);
597 } else {
598 /* append frame payload to the end of the fragment
599 * cache skb */
600 memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
601 flen);
602 }
603 dev_kfree_skb_any(skb);
604 skb = NULL;
605
606 if (fc & IEEE80211_FCTL_MOREFRAGS) {
607 /* more fragments expected - leave the skb in fragment
608 * cache for now; it will be delivered to upper layers
609 * after all fragments have been received */
610 goto rx_exit;
611 }
612
613 /* this was the last fragment and the frame will be
614 * delivered, so remove skb from fragment cache */
615 skb = frag_skb;
616 hdr = (struct ieee80211_hdr_4addr *)skb->data;
617 ieee80211_frag_cache_invalidate(ieee, hdr);
618 }
619
620 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
621 * encrypted/authenticated */
622 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
623 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
624 goto rx_dropped;
625
626 hdr = (struct ieee80211_hdr_4addr *)skb->data;
627 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
628 if ( /*ieee->ieee802_1x && */
629 ieee80211_is_eapol_frame(ieee, skb)) {
630 /* pass unencrypted EAPOL frames even if encryption is
631 * configured */
632 } else {
633 IEEE80211_DEBUG_DROP("encryption configured, but RX "
634 "frame not encrypted (SA=" MAC_FMT
635 ")\n", MAC_ARG(hdr->addr2));
636 goto rx_dropped;
637 }
638 }
639
640 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
641 !ieee80211_is_eapol_frame(ieee, skb)) {
642 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
643 "frame from " MAC_FMT
644 " (drop_unencrypted=1)\n",
645 MAC_ARG(hdr->addr2));
646 goto rx_dropped;
647 }
648
649 /* skb: hdr + (possible reassembled) full plaintext payload */
650
651 payload = skb->data + hdrlen;
652 ethertype = (payload[6] << 8) | payload[7];
653
654 #ifdef NOT_YET
655 /* If IEEE 802.1X is used, check whether the port is authorized to send
656 * the received frame. */
657 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
658 if (ethertype == ETH_P_PAE) {
659 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
660 dev->name);
661 if (ieee->hostapd && ieee->apdev) {
662 /* Send IEEE 802.1X frames to the user
663 * space daemon for processing */
664 prism2_rx_80211(ieee->apdev, skb, rx_stats,
665 PRISM2_RX_MGMT);
666 ieee->apdevstats.rx_packets++;
667 ieee->apdevstats.rx_bytes += skb->len;
668 goto rx_exit;
669 }
670 } else if (!frame_authorized) {
671 printk(KERN_DEBUG "%s: dropped frame from "
672 "unauthorized port (IEEE 802.1X): "
673 "ethertype=0x%04x\n", dev->name, ethertype);
674 goto rx_dropped;
675 }
676 }
677 #endif
678
679 /* convert hdr + possible LLC headers into Ethernet header */
680 if (skb->len - hdrlen >= 8 &&
681 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
682 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
683 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
684 /* remove RFC1042 or Bridge-Tunnel encapsulation and
685 * replace EtherType */
686 skb_pull(skb, hdrlen + SNAP_SIZE);
687 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
688 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
689 } else {
690 u16 len;
691 /* Leave Ethernet header part of hdr and full payload */
692 skb_pull(skb, hdrlen);
693 len = htons(skb->len);
694 memcpy(skb_push(skb, 2), &len, 2);
695 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
696 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
697 }
698
699 #ifdef NOT_YET
700 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
701 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
702 /* Non-standard frame: get addr4 from its bogus location after
703 * the payload */
704 memcpy(skb->data + ETH_ALEN,
705 skb->data + skb->len - ETH_ALEN, ETH_ALEN);
706 skb_trim(skb, skb->len - ETH_ALEN);
707 }
708 #endif
709
710 stats->rx_packets++;
711 stats->rx_bytes += skb->len;
712
713 #ifdef NOT_YET
714 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
715 if (dst[0] & 0x01) {
716 /* copy multicast frame both to the higher layers and
717 * to the wireless media */
718 ieee->ap->bridged_multicast++;
719 skb2 = skb_clone(skb, GFP_ATOMIC);
720 if (skb2 == NULL)
721 printk(KERN_DEBUG "%s: skb_clone failed for "
722 "multicast frame\n", dev->name);
723 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
724 /* send frame directly to the associated STA using
725 * wireless media and not passing to higher layers */
726 ieee->ap->bridged_unicast++;
727 skb2 = skb;
728 skb = NULL;
729 }
730 }
731
732 if (skb2 != NULL) {
733 /* send to wireless media */
734 skb2->protocol = __constant_htons(ETH_P_802_3);
735 skb2->mac.raw = skb2->nh.raw = skb2->data;
736 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
737 skb2->dev = dev;
738 dev_queue_xmit(skb2);
739 }
740 #endif
741
742 if (skb) {
743 skb->protocol = eth_type_trans(skb, dev);
744 memset(skb->cb, 0, sizeof(skb->cb));
745 skb->dev = dev;
746 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
747 netif_rx(skb);
748 }
749
750 rx_exit:
751 #ifdef NOT_YET
752 if (sta)
753 hostap_handle_sta_release(sta);
754 #endif
755 return 1;
756
757 rx_dropped:
758 stats->rx_dropped++;
759
760 /* Returning 0 indicates to caller that we have not handled the SKB--
761 * so it is still allocated and can be used again by underlying
762 * hardware as a DMA target */
763 return 0;
764 }
765
766 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
767
768 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
769
770 /*
771 * Make ther structure we read from the beacon packet has
772 * the right values
773 */
774 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
775 *info_element, int sub_type)
776 {
777
778 if (info_element->qui_subtype != sub_type)
779 return -1;
780 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
781 return -1;
782 if (info_element->qui_type != QOS_OUI_TYPE)
783 return -1;
784 if (info_element->version != QOS_VERSION_1)
785 return -1;
786
787 return 0;
788 }
789
790 /*
791 * Parse a QoS parameter element
792 */
793 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
794 *element_param, struct ieee80211_info_element
795 *info_element)
796 {
797 int ret = 0;
798 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
799
800 if ((info_element == NULL) || (element_param == NULL))
801 return -1;
802
803 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
804 memcpy(element_param->info_element.qui, info_element->data,
805 info_element->len);
806 element_param->info_element.elementID = info_element->id;
807 element_param->info_element.length = info_element->len;
808 } else
809 ret = -1;
810 if (ret == 0)
811 ret = ieee80211_verify_qos_info(&element_param->info_element,
812 QOS_OUI_PARAM_SUB_TYPE);
813 return ret;
814 }
815
816 /*
817 * Parse a QoS information element
818 */
819 static int ieee80211_read_qos_info_element(struct
820 ieee80211_qos_information_element
821 *element_info, struct ieee80211_info_element
822 *info_element)
823 {
824 int ret = 0;
825 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
826
827 if (element_info == NULL)
828 return -1;
829 if (info_element == NULL)
830 return -1;
831
832 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
833 memcpy(element_info->qui, info_element->data,
834 info_element->len);
835 element_info->elementID = info_element->id;
836 element_info->length = info_element->len;
837 } else
838 ret = -1;
839
840 if (ret == 0)
841 ret = ieee80211_verify_qos_info(element_info,
842 QOS_OUI_INFO_SUB_TYPE);
843 return ret;
844 }
845
846 /*
847 * Write QoS parameters from the ac parameters.
848 */
849 static int ieee80211_qos_convert_ac_to_parameters(struct
850 ieee80211_qos_parameter_info
851 *param_elm, struct
852 ieee80211_qos_parameters
853 *qos_param)
854 {
855 int rc = 0;
856 int i;
857 struct ieee80211_qos_ac_parameter *ac_params;
858 u32 txop;
859 u8 cw_min;
860 u8 cw_max;
861
862 for (i = 0; i < QOS_QUEUE_NUM; i++) {
863 ac_params = &(param_elm->ac_params_record[i]);
864
865 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
866 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
867
868 cw_min = ac_params->ecw_min_max & 0x0F;
869 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
870
871 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
872 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
873
874 qos_param->flag[i] =
875 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
876
877 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
878 qos_param->tx_op_limit[i] = (u16) txop;
879 }
880 return rc;
881 }
882
883 /*
884 * we have a generic data element which it may contain QoS information or
885 * parameters element. check the information element length to decide
886 * which type to read
887 */
888 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
889 *info_element,
890 struct ieee80211_network *network)
891 {
892 int rc = 0;
893 struct ieee80211_qos_parameters *qos_param = NULL;
894 struct ieee80211_qos_information_element qos_info_element;
895
896 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
897
898 if (rc == 0) {
899 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
900 network->flags |= NETWORK_HAS_QOS_INFORMATION;
901 } else {
902 struct ieee80211_qos_parameter_info param_element;
903
904 rc = ieee80211_read_qos_param_element(&param_element,
905 info_element);
906 if (rc == 0) {
907 qos_param = &(network->qos_data.parameters);
908 ieee80211_qos_convert_ac_to_parameters(&param_element,
909 qos_param);
910 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
911 network->qos_data.param_count =
912 param_element.info_element.ac_info & 0x0F;
913 }
914 }
915
916 if (rc == 0) {
917 IEEE80211_DEBUG_QOS("QoS is supported\n");
918 network->qos_data.supported = 1;
919 }
920 return rc;
921 }
922
923 static int ieee80211_parse_info_param(struct ieee80211_info_element
924 *info_element, u16 length,
925 struct ieee80211_network *network)
926 {
927 u8 i;
928 #ifdef CONFIG_IEEE80211_DEBUG
929 char rates_str[64];
930 char *p;
931 #endif
932
933 while (length >= sizeof(*info_element)) {
934 if (sizeof(*info_element) + info_element->len > length) {
935 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
936 "info_element->len + 2 > left : "
937 "info_element->len+2=%zd left=%d, id=%d.\n",
938 info_element->len +
939 sizeof(*info_element),
940 length, info_element->id);
941 return 1;
942 }
943
944 switch (info_element->id) {
945 case MFIE_TYPE_SSID:
946 if (ieee80211_is_empty_essid(info_element->data,
947 info_element->len)) {
948 network->flags |= NETWORK_EMPTY_ESSID;
949 break;
950 }
951
952 network->ssid_len = min(info_element->len,
953 (u8) IW_ESSID_MAX_SIZE);
954 memcpy(network->ssid, info_element->data,
955 network->ssid_len);
956 if (network->ssid_len < IW_ESSID_MAX_SIZE)
957 memset(network->ssid + network->ssid_len, 0,
958 IW_ESSID_MAX_SIZE - network->ssid_len);
959
960 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
961 network->ssid, network->ssid_len);
962 break;
963
964 case MFIE_TYPE_RATES:
965 #ifdef CONFIG_IEEE80211_DEBUG
966 p = rates_str;
967 #endif
968 network->rates_len = min(info_element->len,
969 MAX_RATES_LENGTH);
970 for (i = 0; i < network->rates_len; i++) {
971 network->rates[i] = info_element->data[i];
972 #ifdef CONFIG_IEEE80211_DEBUG
973 p += snprintf(p, sizeof(rates_str) -
974 (p - rates_str), "%02X ",
975 network->rates[i]);
976 #endif
977 if (ieee80211_is_ofdm_rate
978 (info_element->data[i])) {
979 network->flags |= NETWORK_HAS_OFDM;
980 if (info_element->data[i] &
981 IEEE80211_BASIC_RATE_MASK)
982 network->flags &=
983 ~NETWORK_HAS_CCK;
984 }
985 }
986
987 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
988 rates_str, network->rates_len);
989 break;
990
991 case MFIE_TYPE_RATES_EX:
992 #ifdef CONFIG_IEEE80211_DEBUG
993 p = rates_str;
994 #endif
995 network->rates_ex_len = min(info_element->len,
996 MAX_RATES_EX_LENGTH);
997 for (i = 0; i < network->rates_ex_len; i++) {
998 network->rates_ex[i] = info_element->data[i];
999 #ifdef CONFIG_IEEE80211_DEBUG
1000 p += snprintf(p, sizeof(rates_str) -
1001 (p - rates_str), "%02X ",
1002 network->rates[i]);
1003 #endif
1004 if (ieee80211_is_ofdm_rate
1005 (info_element->data[i])) {
1006 network->flags |= NETWORK_HAS_OFDM;
1007 if (info_element->data[i] &
1008 IEEE80211_BASIC_RATE_MASK)
1009 network->flags &=
1010 ~NETWORK_HAS_CCK;
1011 }
1012 }
1013
1014 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1015 rates_str, network->rates_ex_len);
1016 break;
1017
1018 case MFIE_TYPE_DS_SET:
1019 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1020 info_element->data[0]);
1021 network->channel = info_element->data[0];
1022 break;
1023
1024 case MFIE_TYPE_FH_SET:
1025 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1026 break;
1027
1028 case MFIE_TYPE_CF_SET:
1029 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1030 break;
1031
1032 case MFIE_TYPE_TIM:
1033 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: ignored\n");
1034 break;
1035
1036 case MFIE_TYPE_ERP_INFO:
1037 network->erp_value = info_element->data[0];
1038 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1039 network->erp_value);
1040 break;
1041
1042 case MFIE_TYPE_IBSS_SET:
1043 network->atim_window = info_element->data[0];
1044 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1045 network->atim_window);
1046 break;
1047
1048 case MFIE_TYPE_CHALLENGE:
1049 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1050 break;
1051
1052 case MFIE_TYPE_GENERIC:
1053 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1054 info_element->len);
1055 if (!ieee80211_parse_qos_info_param_IE(info_element,
1056 network))
1057 break;
1058
1059 if (info_element->len >= 4 &&
1060 info_element->data[0] == 0x00 &&
1061 info_element->data[1] == 0x50 &&
1062 info_element->data[2] == 0xf2 &&
1063 info_element->data[3] == 0x01) {
1064 network->wpa_ie_len = min(info_element->len + 2,
1065 MAX_WPA_IE_LEN);
1066 memcpy(network->wpa_ie, info_element,
1067 network->wpa_ie_len);
1068 }
1069 break;
1070
1071 case MFIE_TYPE_RSN:
1072 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1073 info_element->len);
1074 network->rsn_ie_len = min(info_element->len + 2,
1075 MAX_WPA_IE_LEN);
1076 memcpy(network->rsn_ie, info_element,
1077 network->rsn_ie_len);
1078 break;
1079
1080 case MFIE_TYPE_QOS_PARAMETER:
1081 printk(KERN_ERR
1082 "QoS Error need to parse QOS_PARAMETER IE\n");
1083 break;
1084
1085 default:
1086 IEEE80211_DEBUG_MGMT("unsupported IE %d\n",
1087 info_element->id);
1088 break;
1089 }
1090
1091 length -= sizeof(*info_element) + info_element->len;
1092 info_element =
1093 (struct ieee80211_info_element *)&info_element->
1094 data[info_element->len];
1095 }
1096
1097 return 0;
1098 }
1099
1100 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1101 *frame, struct ieee80211_rx_stats *stats)
1102 {
1103 struct ieee80211_network network_resp;
1104 struct ieee80211_network *network = &network_resp;
1105 struct net_device *dev = ieee->dev;
1106
1107 network->flags = 0;
1108 network->qos_data.active = 0;
1109 network->qos_data.supported = 0;
1110 network->qos_data.param_count = 0;
1111 network->qos_data.old_param_count = 0;
1112
1113 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1114 network->atim_window = le16_to_cpu(frame->aid);
1115 network->listen_interval = le16_to_cpu(frame->status);
1116 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1117 network->capability = le16_to_cpu(frame->capability);
1118 network->last_scanned = jiffies;
1119 network->rates_len = network->rates_ex_len = 0;
1120 network->last_associate = 0;
1121 network->ssid_len = 0;
1122 network->erp_value =
1123 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1124
1125 if (stats->freq == IEEE80211_52GHZ_BAND) {
1126 /* for A band (No DS info) */
1127 network->channel = stats->received_channel;
1128 } else
1129 network->flags |= NETWORK_HAS_CCK;
1130
1131 network->wpa_ie_len = 0;
1132 network->rsn_ie_len = 0;
1133
1134 if (ieee80211_parse_info_param
1135 (frame->info_element, stats->len - sizeof(*frame), network))
1136 return 1;
1137
1138 network->mode = 0;
1139 if (stats->freq == IEEE80211_52GHZ_BAND)
1140 network->mode = IEEE_A;
1141 else {
1142 if (network->flags & NETWORK_HAS_OFDM)
1143 network->mode |= IEEE_G;
1144 if (network->flags & NETWORK_HAS_CCK)
1145 network->mode |= IEEE_B;
1146 }
1147
1148 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1149 network->flags |= NETWORK_EMPTY_ESSID;
1150
1151 memcpy(&network->stats, stats, sizeof(network->stats));
1152
1153 if (ieee->handle_assoc_response != NULL)
1154 ieee->handle_assoc_response(dev, frame, network);
1155
1156 return 0;
1157 }
1158
1159 /***************************************************/
1160
1161 static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1162 *beacon,
1163 struct ieee80211_network *network,
1164 struct ieee80211_rx_stats *stats)
1165 {
1166 network->qos_data.active = 0;
1167 network->qos_data.supported = 0;
1168 network->qos_data.param_count = 0;
1169 network->qos_data.old_param_count = 0;
1170
1171 /* Pull out fixed field data */
1172 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1173 network->capability = le16_to_cpu(beacon->capability);
1174 network->last_scanned = jiffies;
1175 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1176 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1177 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1178 /* Where to pull this? beacon->listen_interval; */
1179 network->listen_interval = 0x0A;
1180 network->rates_len = network->rates_ex_len = 0;
1181 network->last_associate = 0;
1182 network->ssid_len = 0;
1183 network->flags = 0;
1184 network->atim_window = 0;
1185 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1186 0x3 : 0x0;
1187
1188 if (stats->freq == IEEE80211_52GHZ_BAND) {
1189 /* for A band (No DS info) */
1190 network->channel = stats->received_channel;
1191 } else
1192 network->flags |= NETWORK_HAS_CCK;
1193
1194 network->wpa_ie_len = 0;
1195 network->rsn_ie_len = 0;
1196
1197 if (ieee80211_parse_info_param
1198 (beacon->info_element, stats->len - sizeof(*beacon), network))
1199 return 1;
1200
1201 network->mode = 0;
1202 if (stats->freq == IEEE80211_52GHZ_BAND)
1203 network->mode = IEEE_A;
1204 else {
1205 if (network->flags & NETWORK_HAS_OFDM)
1206 network->mode |= IEEE_G;
1207 if (network->flags & NETWORK_HAS_CCK)
1208 network->mode |= IEEE_B;
1209 }
1210
1211 if (network->mode == 0) {
1212 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1213 "network.\n",
1214 escape_essid(network->ssid,
1215 network->ssid_len),
1216 MAC_ARG(network->bssid));
1217 return 1;
1218 }
1219
1220 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1221 network->flags |= NETWORK_EMPTY_ESSID;
1222
1223 memcpy(&network->stats, stats, sizeof(network->stats));
1224
1225 return 0;
1226 }
1227
1228 static inline int is_same_network(struct ieee80211_network *src,
1229 struct ieee80211_network *dst)
1230 {
1231 /* A network is only a duplicate if the channel, BSSID, and ESSID
1232 * all match. We treat all <hidden> with the same BSSID and channel
1233 * as one network */
1234 return ((src->ssid_len == dst->ssid_len) &&
1235 (src->channel == dst->channel) &&
1236 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
1237 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1238 }
1239
1240 static inline void update_network(struct ieee80211_network *dst,
1241 struct ieee80211_network *src)
1242 {
1243 int qos_active;
1244 u8 old_param;
1245
1246 memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1247 dst->capability = src->capability;
1248 memcpy(dst->rates, src->rates, src->rates_len);
1249 dst->rates_len = src->rates_len;
1250 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1251 dst->rates_ex_len = src->rates_ex_len;
1252
1253 dst->mode = src->mode;
1254 dst->flags = src->flags;
1255 dst->time_stamp[0] = src->time_stamp[0];
1256 dst->time_stamp[1] = src->time_stamp[1];
1257
1258 dst->beacon_interval = src->beacon_interval;
1259 dst->listen_interval = src->listen_interval;
1260 dst->atim_window = src->atim_window;
1261 dst->erp_value = src->erp_value;
1262
1263 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1264 dst->wpa_ie_len = src->wpa_ie_len;
1265 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1266 dst->rsn_ie_len = src->rsn_ie_len;
1267
1268 dst->last_scanned = jiffies;
1269 qos_active = src->qos_data.active;
1270 old_param = dst->qos_data.old_param_count;
1271 if (dst->flags & NETWORK_HAS_QOS_MASK)
1272 memcpy(&dst->qos_data, &src->qos_data,
1273 sizeof(struct ieee80211_qos_data));
1274 else {
1275 dst->qos_data.supported = src->qos_data.supported;
1276 dst->qos_data.param_count = src->qos_data.param_count;
1277 }
1278
1279 if (dst->qos_data.supported == 1) {
1280 if (dst->ssid_len)
1281 IEEE80211_DEBUG_QOS
1282 ("QoS the network %s is QoS supported\n",
1283 dst->ssid);
1284 else
1285 IEEE80211_DEBUG_QOS
1286 ("QoS the network is QoS supported\n");
1287 }
1288 dst->qos_data.active = qos_active;
1289 dst->qos_data.old_param_count = old_param;
1290
1291 /* dst->last_associate is not overwritten */
1292 }
1293
1294 static inline int is_beacon(int fc)
1295 {
1296 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1297 }
1298
1299 static inline void ieee80211_process_probe_response(struct ieee80211_device
1300 *ieee, struct
1301 ieee80211_probe_response
1302 *beacon, struct ieee80211_rx_stats
1303 *stats)
1304 {
1305 struct net_device *dev = ieee->dev;
1306 struct ieee80211_network network;
1307 struct ieee80211_network *target;
1308 struct ieee80211_network *oldest = NULL;
1309 #ifdef CONFIG_IEEE80211_DEBUG
1310 struct ieee80211_info_element *info_element = beacon->info_element;
1311 #endif
1312 unsigned long flags;
1313
1314 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1315 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1316 escape_essid(info_element->data,
1317 info_element->len),
1318 MAC_ARG(beacon->header.addr3),
1319 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1320 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1321 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1322 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1323 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1324 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1325 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1326 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1327 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1328 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1329 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1330 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1331 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1332 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1333 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1334 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1335
1336 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1337 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1338 escape_essid(info_element->data,
1339 info_element->len),
1340 MAC_ARG(beacon->header.addr3),
1341 is_beacon(le16_to_cpu
1342 (beacon->header.
1343 frame_ctl)) ?
1344 "BEACON" : "PROBE RESPONSE");
1345 return;
1346 }
1347
1348 /* The network parsed correctly -- so now we scan our known networks
1349 * to see if we can find it in our list.
1350 *
1351 * NOTE: This search is definitely not optimized. Once its doing
1352 * the "right thing" we'll optimize it for efficiency if
1353 * necessary */
1354
1355 /* Search for this entry in the list and update it if it is
1356 * already there. */
1357
1358 spin_lock_irqsave(&ieee->lock, flags);
1359
1360 list_for_each_entry(target, &ieee->network_list, list) {
1361 if (is_same_network(target, &network))
1362 break;
1363
1364 if ((oldest == NULL) ||
1365 (target->last_scanned < oldest->last_scanned))
1366 oldest = target;
1367 }
1368
1369 /* If we didn't find a match, then get a new network slot to initialize
1370 * with this beacon's information */
1371 if (&target->list == &ieee->network_list) {
1372 if (list_empty(&ieee->network_free_list)) {
1373 /* If there are no more slots, expire the oldest */
1374 list_del(&oldest->list);
1375 target = oldest;
1376 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1377 "network list.\n",
1378 escape_essid(target->ssid,
1379 target->ssid_len),
1380 MAC_ARG(target->bssid));
1381 } else {
1382 /* Otherwise just pull from the free list */
1383 target = list_entry(ieee->network_free_list.next,
1384 struct ieee80211_network, list);
1385 list_del(ieee->network_free_list.next);
1386 }
1387
1388 #ifdef CONFIG_IEEE80211_DEBUG
1389 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1390 escape_essid(network.ssid,
1391 network.ssid_len),
1392 MAC_ARG(network.bssid),
1393 is_beacon(le16_to_cpu
1394 (beacon->header.
1395 frame_ctl)) ?
1396 "BEACON" : "PROBE RESPONSE");
1397 #endif
1398 memcpy(target, &network, sizeof(*target));
1399 list_add_tail(&target->list, &ieee->network_list);
1400 } else {
1401 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1402 escape_essid(target->ssid,
1403 target->ssid_len),
1404 MAC_ARG(target->bssid),
1405 is_beacon(le16_to_cpu
1406 (beacon->header.
1407 frame_ctl)) ?
1408 "BEACON" : "PROBE RESPONSE");
1409 update_network(target, &network);
1410 }
1411
1412 spin_unlock_irqrestore(&ieee->lock, flags);
1413
1414 if (is_beacon(le16_to_cpu(beacon->header.frame_ctl))) {
1415 if (ieee->handle_beacon != NULL)
1416 ieee->handle_beacon(dev, beacon, &network);
1417 } else {
1418 if (ieee->handle_probe_response != NULL)
1419 ieee->handle_probe_response(dev, beacon, &network);
1420 }
1421 }
1422
1423 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1424 struct ieee80211_hdr_4addr *header,
1425 struct ieee80211_rx_stats *stats)
1426 {
1427 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1428 case IEEE80211_STYPE_ASSOC_RESP:
1429 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1430 WLAN_FC_GET_STYPE(le16_to_cpu
1431 (header->frame_ctl)));
1432 ieee80211_handle_assoc_resp(ieee,
1433 (struct ieee80211_assoc_response *)
1434 header, stats);
1435 break;
1436
1437 case IEEE80211_STYPE_REASSOC_RESP:
1438 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1439 WLAN_FC_GET_STYPE(le16_to_cpu
1440 (header->frame_ctl)));
1441 break;
1442
1443 case IEEE80211_STYPE_PROBE_REQ:
1444 IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
1445 WLAN_FC_GET_STYPE(le16_to_cpu
1446 (header->frame_ctl)));
1447
1448 if (ieee->handle_probe_request != NULL)
1449 ieee->handle_probe_request(ieee->dev,
1450 (struct
1451 ieee80211_probe_request *)
1452 header, stats);
1453 break;
1454
1455 case IEEE80211_STYPE_PROBE_RESP:
1456 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1457 WLAN_FC_GET_STYPE(le16_to_cpu
1458 (header->frame_ctl)));
1459 IEEE80211_DEBUG_SCAN("Probe response\n");
1460 ieee80211_process_probe_response(ieee,
1461 (struct
1462 ieee80211_probe_response *)
1463 header, stats);
1464 break;
1465
1466 case IEEE80211_STYPE_BEACON:
1467 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1468 WLAN_FC_GET_STYPE(le16_to_cpu
1469 (header->frame_ctl)));
1470 IEEE80211_DEBUG_SCAN("Beacon\n");
1471 ieee80211_process_probe_response(ieee,
1472 (struct
1473 ieee80211_probe_response *)
1474 header, stats);
1475 break;
1476 case IEEE80211_STYPE_AUTH:
1477
1478 IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
1479 WLAN_FC_GET_STYPE(le16_to_cpu
1480 (header->frame_ctl)));
1481
1482 if (ieee->handle_auth != NULL)
1483 ieee->handle_auth(ieee->dev,
1484 (struct ieee80211_auth *)header);
1485 break;
1486
1487 case IEEE80211_STYPE_DISASSOC:
1488 if (ieee->handle_disassoc != NULL)
1489 ieee->handle_disassoc(ieee->dev,
1490 (struct ieee80211_disassoc *)
1491 header);
1492 break;
1493
1494 case IEEE80211_STYPE_DEAUTH:
1495 printk("DEAUTH from AP\n");
1496 if (ieee->handle_deauth != NULL)
1497 ieee->handle_deauth(ieee->dev, (struct ieee80211_auth *)
1498 header);
1499 break;
1500 default:
1501 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1502 WLAN_FC_GET_STYPE(le16_to_cpu
1503 (header->frame_ctl)));
1504 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1505 ieee->dev->name,
1506 WLAN_FC_GET_STYPE(le16_to_cpu
1507 (header->frame_ctl)));
1508 break;
1509 }
1510 }
1511
1512 EXPORT_SYMBOL(ieee80211_rx_mgt);
1513 EXPORT_SYMBOL(ieee80211_rx);
linux 2.6 git repository for openrd