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[PARISC] irq_affinityp[] only available for SMP builds
[linux-2.6.22.y-op.git] / net / ieee80211 / ieee80211_rx.c
blob03efaacbdb737349999667995d092aaf96485491
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 inline 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 memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
80 memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
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 inline 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 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
247 memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
248 /* ToDS frame with own addr BSSID and DA */
249 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
250 IEEE80211_FCTL_FROMDS &&
251 memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
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 inline 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 inline 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
354 hdr = (struct ieee80211_hdr_4addr *)skb->data;
355 stats = &ieee->stats;
356
357 if (skb->len < 10) {
358 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
359 goto rx_dropped;
360 }
361
362 fc = le16_to_cpu(hdr->frame_ctl);
363 type = WLAN_FC_GET_TYPE(fc);
364 stype = WLAN_FC_GET_STYPE(fc);
365 sc = le16_to_cpu(hdr->seq_ctl);
366 frag = WLAN_GET_SEQ_FRAG(sc);
367 hdrlen = ieee80211_get_hdrlen(fc);
368
369 /* Put this code here so that we avoid duplicating it in all
370 * Rx paths. - Jean II */
371 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
372 #ifdef CONFIG_NET_RADIO
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 /* CONFIG_NET_RADIO */
400 #endif /* IW_WIRELESS_SPY */
401
402 #ifdef NOT_YET
403 hostap_update_rx_stats(local->ap, hdr, rx_stats);
404 #endif
405
406 if (ieee->iw_mode == IW_MODE_MONITOR) {
407 ieee80211_monitor_rx(ieee, skb, rx_stats);
408 stats->rx_packets++;
409 stats->rx_bytes += skb->len;
410 return 1;
411 }
412
413 if ((is_multicast_ether_addr(hdr->addr1) ||
414 is_broadcast_ether_addr(hdr->addr2)) ? ieee->host_mc_decrypt :
415 ieee->host_decrypt) {
416 int idx = 0;
417 if (skb->len >= hdrlen + 3)
418 idx = skb->data[hdrlen + 3] >> 6;
419 crypt = ieee->crypt[idx];
420 #ifdef NOT_YET
421 sta = NULL;
422
423 /* Use station specific key to override default keys if the
424 * receiver address is a unicast address ("individual RA"). If
425 * bcrx_sta_key parameter is set, station specific key is used
426 * even with broad/multicast targets (this is against IEEE
427 * 802.11, but makes it easier to use different keys with
428 * stations that do not support WEP key mapping). */
429
430 if (!(hdr->addr1[0] & 0x01) || local->bcrx_sta_key)
431 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
432 &sta);
433 #endif
434
435 /* allow NULL decrypt to indicate an station specific override
436 * for default encryption */
437 if (crypt && (crypt->ops == NULL ||
438 crypt->ops->decrypt_mpdu == NULL))
439 crypt = NULL;
440
441 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
442 /* This seems to be triggered by some (multicast?)
443 * frames from other than current BSS, so just drop the
444 * frames silently instead of filling system log with
445 * these reports. */
446 IEEE80211_DEBUG_DROP("Decryption failed (not set)"
447 " (SA=" MAC_FMT ")\n",
448 MAC_ARG(hdr->addr2));
449 ieee->ieee_stats.rx_discards_undecryptable++;
450 goto rx_dropped;
451 }
452 }
453 #ifdef NOT_YET
454 if (type != WLAN_FC_TYPE_DATA) {
455 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
456 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
457 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
458 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
459 "from " MAC_FMT "\n", dev->name,
460 MAC_ARG(hdr->addr2));
461 /* TODO: could inform hostapd about this so that it
462 * could send auth failure report */
463 goto rx_dropped;
464 }
465
466 if (ieee80211_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
467 goto rx_dropped;
468 else
469 goto rx_exit;
470 }
471 #endif
472
473 /* Data frame - extract src/dst addresses */
474 if (skb->len < IEEE80211_3ADDR_LEN)
475 goto rx_dropped;
476
477 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
478 case IEEE80211_FCTL_FROMDS:
479 memcpy(dst, hdr->addr1, ETH_ALEN);
480 memcpy(src, hdr->addr3, ETH_ALEN);
481 break;
482 case IEEE80211_FCTL_TODS:
483 memcpy(dst, hdr->addr3, ETH_ALEN);
484 memcpy(src, hdr->addr2, ETH_ALEN);
485 break;
486 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
487 if (skb->len < IEEE80211_4ADDR_LEN)
488 goto rx_dropped;
489 memcpy(dst, hdr->addr3, ETH_ALEN);
490 memcpy(src, hdr->addr4, ETH_ALEN);
491 break;
492 case 0:
493 memcpy(dst, hdr->addr1, ETH_ALEN);
494 memcpy(src, hdr->addr2, ETH_ALEN);
495 break;
496 }
497
498 #ifdef NOT_YET
499 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
500 goto rx_dropped;
501 if (wds) {
502 skb->dev = dev = wds;
503 stats = hostap_get_stats(dev);
504 }
505
506 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
507 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
508 IEEE80211_FCTL_FROMDS && ieee->stadev
509 && memcmp(hdr->addr2, ieee->assoc_ap_addr, ETH_ALEN) == 0) {
510 /* Frame from BSSID of the AP for which we are a client */
511 skb->dev = dev = ieee->stadev;
512 stats = hostap_get_stats(dev);
513 from_assoc_ap = 1;
514 }
515 #endif
516
517 dev->last_rx = jiffies;
518
519 #ifdef NOT_YET
520 if ((ieee->iw_mode == IW_MODE_MASTER ||
521 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
522 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
523 wds != NULL)) {
524 case AP_RX_CONTINUE_NOT_AUTHORIZED:
525 frame_authorized = 0;
526 break;
527 case AP_RX_CONTINUE:
528 frame_authorized = 1;
529 break;
530 case AP_RX_DROP:
531 goto rx_dropped;
532 case AP_RX_EXIT:
533 goto rx_exit;
534 }
535 }
536 #endif
537
538 /* Nullfunc frames may have PS-bit set, so they must be passed to
539 * hostap_handle_sta_rx() before being dropped here. */
540
541 stype &= ~IEEE80211_STYPE_QOS_DATA;
542
543 if (stype != IEEE80211_STYPE_DATA &&
544 stype != IEEE80211_STYPE_DATA_CFACK &&
545 stype != IEEE80211_STYPE_DATA_CFPOLL &&
546 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
547 if (stype != IEEE80211_STYPE_NULLFUNC)
548 IEEE80211_DEBUG_DROP("RX: dropped data frame "
549 "with no data (type=0x%02x, "
550 "subtype=0x%02x, len=%d)\n",
551 type, stype, skb->len);
552 goto rx_dropped;
553 }
554
555 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
556
557 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
558 (keyidx = ieee80211_rx_frame_decrypt(ieee, skb, crypt)) < 0)
559 goto rx_dropped;
560
561 hdr = (struct ieee80211_hdr_4addr *)skb->data;
562
563 /* skb: hdr + (possibly fragmented) plaintext payload */
564 // PR: FIXME: hostap has additional conditions in the "if" below:
565 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
566 if ((frag != 0 || (fc & IEEE80211_FCTL_MOREFRAGS))) {
567 int flen;
568 struct sk_buff *frag_skb = ieee80211_frag_cache_get(ieee, hdr);
569 IEEE80211_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
570
571 if (!frag_skb) {
572 IEEE80211_DEBUG(IEEE80211_DL_RX | IEEE80211_DL_FRAG,
573 "Rx cannot get skb from fragment "
574 "cache (morefrag=%d seq=%u frag=%u)\n",
575 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
576 WLAN_GET_SEQ_SEQ(sc), frag);
577 goto rx_dropped;
578 }
579
580 flen = skb->len;
581 if (frag != 0)
582 flen -= hdrlen;
583
584 if (frag_skb->tail + flen > frag_skb->end) {
585 printk(KERN_WARNING "%s: host decrypted and "
586 "reassembled frame did not fit skb\n",
587 dev->name);
588 ieee80211_frag_cache_invalidate(ieee, hdr);
589 goto rx_dropped;
590 }
591
592 if (frag == 0) {
593 /* copy first fragment (including full headers) into
594 * beginning of the fragment cache skb */
595 memcpy(skb_put(frag_skb, flen), skb->data, flen);
596 } else {
597 /* append frame payload to the end of the fragment
598 * cache skb */
599 memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
600 flen);
601 }
602 dev_kfree_skb_any(skb);
603 skb = NULL;
604
605 if (fc & IEEE80211_FCTL_MOREFRAGS) {
606 /* more fragments expected - leave the skb in fragment
607 * cache for now; it will be delivered to upper layers
608 * after all fragments have been received */
609 goto rx_exit;
610 }
611
612 /* this was the last fragment and the frame will be
613 * delivered, so remove skb from fragment cache */
614 skb = frag_skb;
615 hdr = (struct ieee80211_hdr_4addr *)skb->data;
616 ieee80211_frag_cache_invalidate(ieee, hdr);
617 }
618
619 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
620 * encrypted/authenticated */
621 if (ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
622 ieee80211_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
623 goto rx_dropped;
624
625 hdr = (struct ieee80211_hdr_4addr *)skb->data;
626 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
627 if ( /*ieee->ieee802_1x && */
628 ieee80211_is_eapol_frame(ieee, skb)) {
629 /* pass unencrypted EAPOL frames even if encryption is
630 * configured */
631 } else {
632 IEEE80211_DEBUG_DROP("encryption configured, but RX "
633 "frame not encrypted (SA=" MAC_FMT
634 ")\n", MAC_ARG(hdr->addr2));
635 goto rx_dropped;
636 }
637 }
638
639 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
640 !ieee80211_is_eapol_frame(ieee, skb)) {
641 IEEE80211_DEBUG_DROP("dropped unencrypted RX data "
642 "frame from " MAC_FMT
643 " (drop_unencrypted=1)\n",
644 MAC_ARG(hdr->addr2));
645 goto rx_dropped;
646 }
647
648 /* skb: hdr + (possible reassembled) full plaintext payload */
649
650 payload = skb->data + hdrlen;
651 ethertype = (payload[6] << 8) | payload[7];
652
653 #ifdef NOT_YET
654 /* If IEEE 802.1X is used, check whether the port is authorized to send
655 * the received frame. */
656 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
657 if (ethertype == ETH_P_PAE) {
658 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
659 dev->name);
660 if (ieee->hostapd && ieee->apdev) {
661 /* Send IEEE 802.1X frames to the user
662 * space daemon for processing */
663 prism2_rx_80211(ieee->apdev, skb, rx_stats,
664 PRISM2_RX_MGMT);
665 ieee->apdevstats.rx_packets++;
666 ieee->apdevstats.rx_bytes += skb->len;
667 goto rx_exit;
668 }
669 } else if (!frame_authorized) {
670 printk(KERN_DEBUG "%s: dropped frame from "
671 "unauthorized port (IEEE 802.1X): "
672 "ethertype=0x%04x\n", dev->name, ethertype);
673 goto rx_dropped;
674 }
675 }
676 #endif
677
678 /* convert hdr + possible LLC headers into Ethernet header */
679 if (skb->len - hdrlen >= 8 &&
680 ((memcmp(payload, rfc1042_header, SNAP_SIZE) == 0 &&
681 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
682 memcmp(payload, bridge_tunnel_header, SNAP_SIZE) == 0)) {
683 /* remove RFC1042 or Bridge-Tunnel encapsulation and
684 * replace EtherType */
685 skb_pull(skb, hdrlen + SNAP_SIZE);
686 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
687 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
688 } else {
689 u16 len;
690 /* Leave Ethernet header part of hdr and full payload */
691 skb_pull(skb, hdrlen);
692 len = htons(skb->len);
693 memcpy(skb_push(skb, 2), &len, 2);
694 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
695 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
696 }
697
698 #ifdef NOT_YET
699 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
700 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
701 /* Non-standard frame: get addr4 from its bogus location after
702 * the payload */
703 memcpy(skb->data + ETH_ALEN,
704 skb->data + skb->len - ETH_ALEN, ETH_ALEN);
705 skb_trim(skb, skb->len - ETH_ALEN);
706 }
707 #endif
708
709 stats->rx_packets++;
710 stats->rx_bytes += skb->len;
711
712 #ifdef NOT_YET
713 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
714 if (dst[0] & 0x01) {
715 /* copy multicast frame both to the higher layers and
716 * to the wireless media */
717 ieee->ap->bridged_multicast++;
718 skb2 = skb_clone(skb, GFP_ATOMIC);
719 if (skb2 == NULL)
720 printk(KERN_DEBUG "%s: skb_clone failed for "
721 "multicast frame\n", dev->name);
722 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
723 /* send frame directly to the associated STA using
724 * wireless media and not passing to higher layers */
725 ieee->ap->bridged_unicast++;
726 skb2 = skb;
727 skb = NULL;
728 }
729 }
730
731 if (skb2 != NULL) {
732 /* send to wireless media */
733 skb2->protocol = __constant_htons(ETH_P_802_3);
734 skb2->mac.raw = skb2->nh.raw = skb2->data;
735 /* skb2->nh.raw = skb2->data + ETH_HLEN; */
736 skb2->dev = dev;
737 dev_queue_xmit(skb2);
738 }
739 #endif
740
741 if (skb) {
742 skb->protocol = eth_type_trans(skb, dev);
743 memset(skb->cb, 0, sizeof(skb->cb));
744 skb->dev = dev;
745 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
746 netif_rx(skb);
747 }
748
749 rx_exit:
750 #ifdef NOT_YET
751 if (sta)
752 hostap_handle_sta_release(sta);
753 #endif
754 return 1;
755
756 rx_dropped:
757 stats->rx_dropped++;
758
759 /* Returning 0 indicates to caller that we have not handled the SKB--
760 * so it is still allocated and can be used again by underlying
761 * hardware as a DMA target */
762 return 0;
763 }
764
765 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
766
767 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
768
769 /*
770 * Make ther structure we read from the beacon packet has
771 * the right values
772 */
773 static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element
774 *info_element, int sub_type)
775 {
776
777 if (info_element->qui_subtype != sub_type)
778 return -1;
779 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
780 return -1;
781 if (info_element->qui_type != QOS_OUI_TYPE)
782 return -1;
783 if (info_element->version != QOS_VERSION_1)
784 return -1;
785
786 return 0;
787 }
788
789 /*
790 * Parse a QoS parameter element
791 */
792 static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info
793 *element_param, struct ieee80211_info_element
794 *info_element)
795 {
796 int ret = 0;
797 u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;
798
799 if ((info_element == NULL) || (element_param == NULL))
800 return -1;
801
802 if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
803 memcpy(element_param->info_element.qui, info_element->data,
804 info_element->len);
805 element_param->info_element.elementID = info_element->id;
806 element_param->info_element.length = info_element->len;
807 } else
808 ret = -1;
809 if (ret == 0)
810 ret = ieee80211_verify_qos_info(&element_param->info_element,
811 QOS_OUI_PARAM_SUB_TYPE);
812 return ret;
813 }
814
815 /*
816 * Parse a QoS information element
817 */
818 static int ieee80211_read_qos_info_element(struct
819 ieee80211_qos_information_element
820 *element_info, struct ieee80211_info_element
821 *info_element)
822 {
823 int ret = 0;
824 u16 size = sizeof(struct ieee80211_qos_information_element) - 2;
825
826 if (element_info == NULL)
827 return -1;
828 if (info_element == NULL)
829 return -1;
830
831 if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
832 memcpy(element_info->qui, info_element->data,
833 info_element->len);
834 element_info->elementID = info_element->id;
835 element_info->length = info_element->len;
836 } else
837 ret = -1;
838
839 if (ret == 0)
840 ret = ieee80211_verify_qos_info(element_info,
841 QOS_OUI_INFO_SUB_TYPE);
842 return ret;
843 }
844
845 /*
846 * Write QoS parameters from the ac parameters.
847 */
848 static int ieee80211_qos_convert_ac_to_parameters(struct
849 ieee80211_qos_parameter_info
850 *param_elm, struct
851 ieee80211_qos_parameters
852 *qos_param)
853 {
854 int rc = 0;
855 int i;
856 struct ieee80211_qos_ac_parameter *ac_params;
857 u32 txop;
858 u8 cw_min;
859 u8 cw_max;
860
861 for (i = 0; i < QOS_QUEUE_NUM; i++) {
862 ac_params = &(param_elm->ac_params_record[i]);
863
864 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
865 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
866
867 cw_min = ac_params->ecw_min_max & 0x0F;
868 qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);
869
870 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
871 qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);
872
873 qos_param->flag[i] =
874 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
875
876 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
877 qos_param->tx_op_limit[i] = (u16) txop;
878 }
879 return rc;
880 }
881
882 /*
883 * we have a generic data element which it may contain QoS information or
884 * parameters element. check the information element length to decide
885 * which type to read
886 */
887 static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element
888 *info_element,
889 struct ieee80211_network *network)
890 {
891 int rc = 0;
892 struct ieee80211_qos_parameters *qos_param = NULL;
893 struct ieee80211_qos_information_element qos_info_element;
894
895 rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);
896
897 if (rc == 0) {
898 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
899 network->flags |= NETWORK_HAS_QOS_INFORMATION;
900 } else {
901 struct ieee80211_qos_parameter_info param_element;
902
903 rc = ieee80211_read_qos_param_element(&param_element,
904 info_element);
905 if (rc == 0) {
906 qos_param = &(network->qos_data.parameters);
907 ieee80211_qos_convert_ac_to_parameters(&param_element,
908 qos_param);
909 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
910 network->qos_data.param_count =
911 param_element.info_element.ac_info & 0x0F;
912 }
913 }
914
915 if (rc == 0) {
916 IEEE80211_DEBUG_QOS("QoS is supported\n");
917 network->qos_data.supported = 1;
918 }
919 return rc;
920 }
921
922 static int ieee80211_parse_info_param(struct ieee80211_info_element
923 *info_element, u16 length,
924 struct ieee80211_network *network)
925 {
926 u8 i;
927 #ifdef CONFIG_IEEE80211_DEBUG
928 char rates_str[64];
929 char *p;
930 #endif
931
932 while (length >= sizeof(*info_element)) {
933 if (sizeof(*info_element) + info_element->len > length) {
934 IEEE80211_DEBUG_MGMT("Info elem: parse failed: "
935 "info_element->len + 2 > left : "
936 "info_element->len+2=%zd left=%d, id=%d.\n",
937 info_element->len +
938 sizeof(*info_element),
939 length, info_element->id);
940 return 1;
941 }
942
943 switch (info_element->id) {
944 case MFIE_TYPE_SSID:
945 if (ieee80211_is_empty_essid(info_element->data,
946 info_element->len)) {
947 network->flags |= NETWORK_EMPTY_ESSID;
948 break;
949 }
950
951 network->ssid_len = min(info_element->len,
952 (u8) IW_ESSID_MAX_SIZE);
953 memcpy(network->ssid, info_element->data,
954 network->ssid_len);
955 if (network->ssid_len < IW_ESSID_MAX_SIZE)
956 memset(network->ssid + network->ssid_len, 0,
957 IW_ESSID_MAX_SIZE - network->ssid_len);
958
959 IEEE80211_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
960 network->ssid, network->ssid_len);
961 break;
962
963 case MFIE_TYPE_RATES:
964 #ifdef CONFIG_IEEE80211_DEBUG
965 p = rates_str;
966 #endif
967 network->rates_len = min(info_element->len,
968 MAX_RATES_LENGTH);
969 for (i = 0; i < network->rates_len; i++) {
970 network->rates[i] = info_element->data[i];
971 #ifdef CONFIG_IEEE80211_DEBUG
972 p += snprintf(p, sizeof(rates_str) -
973 (p - rates_str), "%02X ",
974 network->rates[i]);
975 #endif
976 if (ieee80211_is_ofdm_rate
977 (info_element->data[i])) {
978 network->flags |= NETWORK_HAS_OFDM;
979 if (info_element->data[i] &
980 IEEE80211_BASIC_RATE_MASK)
981 network->flags &=
982 ~NETWORK_HAS_CCK;
983 }
984 }
985
986 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
987 rates_str, network->rates_len);
988 break;
989
990 case MFIE_TYPE_RATES_EX:
991 #ifdef CONFIG_IEEE80211_DEBUG
992 p = rates_str;
993 #endif
994 network->rates_ex_len = min(info_element->len,
995 MAX_RATES_EX_LENGTH);
996 for (i = 0; i < network->rates_ex_len; i++) {
997 network->rates_ex[i] = info_element->data[i];
998 #ifdef CONFIG_IEEE80211_DEBUG
999 p += snprintf(p, sizeof(rates_str) -
1000 (p - rates_str), "%02X ",
1001 network->rates[i]);
1002 #endif
1003 if (ieee80211_is_ofdm_rate
1004 (info_element->data[i])) {
1005 network->flags |= NETWORK_HAS_OFDM;
1006 if (info_element->data[i] &
1007 IEEE80211_BASIC_RATE_MASK)
1008 network->flags &=
1009 ~NETWORK_HAS_CCK;
1010 }
1011 }
1012
1013 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1014 rates_str, network->rates_ex_len);
1015 break;
1016
1017 case MFIE_TYPE_DS_SET:
1018 IEEE80211_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1019 info_element->data[0]);
1020 network->channel = info_element->data[0];
1021 break;
1022
1023 case MFIE_TYPE_FH_SET:
1024 IEEE80211_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1025 break;
1026
1027 case MFIE_TYPE_CF_SET:
1028 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1029 break;
1030
1031 case MFIE_TYPE_TIM:
1032 IEEE80211_DEBUG_MGMT("MFIE_TYPE_TIM: ignored\n");
1033 break;
1034
1035 case MFIE_TYPE_ERP_INFO:
1036 network->erp_value = info_element->data[0];
1037 IEEE80211_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1038 network->erp_value);
1039 break;
1040
1041 case MFIE_TYPE_IBSS_SET:
1042 network->atim_window = info_element->data[0];
1043 IEEE80211_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1044 network->atim_window);
1045 break;
1046
1047 case MFIE_TYPE_CHALLENGE:
1048 IEEE80211_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1049 break;
1050
1051 case MFIE_TYPE_GENERIC:
1052 IEEE80211_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1053 info_element->len);
1054 if (!ieee80211_parse_qos_info_param_IE(info_element,
1055 network))
1056 break;
1057
1058 if (info_element->len >= 4 &&
1059 info_element->data[0] == 0x00 &&
1060 info_element->data[1] == 0x50 &&
1061 info_element->data[2] == 0xf2 &&
1062 info_element->data[3] == 0x01) {
1063 network->wpa_ie_len = min(info_element->len + 2,
1064 MAX_WPA_IE_LEN);
1065 memcpy(network->wpa_ie, info_element,
1066 network->wpa_ie_len);
1067 }
1068 break;
1069
1070 case MFIE_TYPE_RSN:
1071 IEEE80211_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
1072 info_element->len);
1073 network->rsn_ie_len = min(info_element->len + 2,
1074 MAX_WPA_IE_LEN);
1075 memcpy(network->rsn_ie, info_element,
1076 network->rsn_ie_len);
1077 break;
1078
1079 case MFIE_TYPE_QOS_PARAMETER:
1080 printk(KERN_ERR
1081 "QoS Error need to parse QOS_PARAMETER IE\n");
1082 break;
1083
1084 default:
1085 IEEE80211_DEBUG_MGMT("unsupported IE %d\n",
1086 info_element->id);
1087 break;
1088 }
1089
1090 length -= sizeof(*info_element) + info_element->len;
1091 info_element =
1092 (struct ieee80211_info_element *)&info_element->
1093 data[info_element->len];
1094 }
1095
1096 return 0;
1097 }
1098
1099 static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response
1100 *frame, struct ieee80211_rx_stats *stats)
1101 {
1102 struct ieee80211_network network_resp;
1103 struct ieee80211_network *network = &network_resp;
1104 struct net_device *dev = ieee->dev;
1105
1106 network->flags = 0;
1107 network->qos_data.active = 0;
1108 network->qos_data.supported = 0;
1109 network->qos_data.param_count = 0;
1110 network->qos_data.old_param_count = 0;
1111
1112 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1113 network->atim_window = le16_to_cpu(frame->aid);
1114 network->listen_interval = le16_to_cpu(frame->status);
1115 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1116 network->capability = le16_to_cpu(frame->capability);
1117 network->last_scanned = jiffies;
1118 network->rates_len = network->rates_ex_len = 0;
1119 network->last_associate = 0;
1120 network->ssid_len = 0;
1121 network->erp_value =
1122 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1123
1124 if (stats->freq == IEEE80211_52GHZ_BAND) {
1125 /* for A band (No DS info) */
1126 network->channel = stats->received_channel;
1127 } else
1128 network->flags |= NETWORK_HAS_CCK;
1129
1130 network->wpa_ie_len = 0;
1131 network->rsn_ie_len = 0;
1132
1133 if (ieee80211_parse_info_param
1134 (frame->info_element, stats->len - sizeof(*frame), network))
1135 return 1;
1136
1137 network->mode = 0;
1138 if (stats->freq == IEEE80211_52GHZ_BAND)
1139 network->mode = IEEE_A;
1140 else {
1141 if (network->flags & NETWORK_HAS_OFDM)
1142 network->mode |= IEEE_G;
1143 if (network->flags & NETWORK_HAS_CCK)
1144 network->mode |= IEEE_B;
1145 }
1146
1147 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1148 network->flags |= NETWORK_EMPTY_ESSID;
1149
1150 memcpy(&network->stats, stats, sizeof(network->stats));
1151
1152 if (ieee->handle_assoc_response != NULL)
1153 ieee->handle_assoc_response(dev, frame, network);
1154
1155 return 0;
1156 }
1157
1158 /***************************************************/
1159
1160 static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct ieee80211_probe_response
1161 *beacon,
1162 struct ieee80211_network *network,
1163 struct ieee80211_rx_stats *stats)
1164 {
1165 network->qos_data.active = 0;
1166 network->qos_data.supported = 0;
1167 network->qos_data.param_count = 0;
1168 network->qos_data.old_param_count = 0;
1169
1170 /* Pull out fixed field data */
1171 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1172 network->capability = le16_to_cpu(beacon->capability);
1173 network->last_scanned = jiffies;
1174 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1175 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1176 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1177 /* Where to pull this? beacon->listen_interval; */
1178 network->listen_interval = 0x0A;
1179 network->rates_len = network->rates_ex_len = 0;
1180 network->last_associate = 0;
1181 network->ssid_len = 0;
1182 network->flags = 0;
1183 network->atim_window = 0;
1184 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1185 0x3 : 0x0;
1186
1187 if (stats->freq == IEEE80211_52GHZ_BAND) {
1188 /* for A band (No DS info) */
1189 network->channel = stats->received_channel;
1190 } else
1191 network->flags |= NETWORK_HAS_CCK;
1192
1193 network->wpa_ie_len = 0;
1194 network->rsn_ie_len = 0;
1195
1196 if (ieee80211_parse_info_param
1197 (beacon->info_element, stats->len - sizeof(*beacon), network))
1198 return 1;
1199
1200 network->mode = 0;
1201 if (stats->freq == IEEE80211_52GHZ_BAND)
1202 network->mode = IEEE_A;
1203 else {
1204 if (network->flags & NETWORK_HAS_OFDM)
1205 network->mode |= IEEE_G;
1206 if (network->flags & NETWORK_HAS_CCK)
1207 network->mode |= IEEE_B;
1208 }
1209
1210 if (network->mode == 0) {
1211 IEEE80211_DEBUG_SCAN("Filtered out '%s (" MAC_FMT ")' "
1212 "network.\n",
1213 escape_essid(network->ssid,
1214 network->ssid_len),
1215 MAC_ARG(network->bssid));
1216 return 1;
1217 }
1218
1219 if (ieee80211_is_empty_essid(network->ssid, network->ssid_len))
1220 network->flags |= NETWORK_EMPTY_ESSID;
1221
1222 memcpy(&network->stats, stats, sizeof(network->stats));
1223
1224 return 0;
1225 }
1226
1227 static inline int is_same_network(struct ieee80211_network *src,
1228 struct ieee80211_network *dst)
1229 {
1230 /* A network is only a duplicate if the channel, BSSID, and ESSID
1231 * all match. We treat all <hidden> with the same BSSID and channel
1232 * as one network */
1233 return ((src->ssid_len == dst->ssid_len) &&
1234 (src->channel == dst->channel) &&
1235 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
1236 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1237 }
1238
1239 static inline void update_network(struct ieee80211_network *dst,
1240 struct ieee80211_network *src)
1241 {
1242 int qos_active;
1243 u8 old_param;
1244
1245 memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));
1246 dst->capability = src->capability;
1247 memcpy(dst->rates, src->rates, src->rates_len);
1248 dst->rates_len = src->rates_len;
1249 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1250 dst->rates_ex_len = src->rates_ex_len;
1251
1252 dst->mode = src->mode;
1253 dst->flags = src->flags;
1254 dst->time_stamp[0] = src->time_stamp[0];
1255 dst->time_stamp[1] = src->time_stamp[1];
1256
1257 dst->beacon_interval = src->beacon_interval;
1258 dst->listen_interval = src->listen_interval;
1259 dst->atim_window = src->atim_window;
1260 dst->erp_value = src->erp_value;
1261
1262 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1263 dst->wpa_ie_len = src->wpa_ie_len;
1264 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1265 dst->rsn_ie_len = src->rsn_ie_len;
1266
1267 dst->last_scanned = jiffies;
1268 qos_active = src->qos_data.active;
1269 old_param = dst->qos_data.old_param_count;
1270 if (dst->flags & NETWORK_HAS_QOS_MASK)
1271 memcpy(&dst->qos_data, &src->qos_data,
1272 sizeof(struct ieee80211_qos_data));
1273 else {
1274 dst->qos_data.supported = src->qos_data.supported;
1275 dst->qos_data.param_count = src->qos_data.param_count;
1276 }
1277
1278 if (dst->qos_data.supported == 1) {
1279 if (dst->ssid_len)
1280 IEEE80211_DEBUG_QOS
1281 ("QoS the network %s is QoS supported\n",
1282 dst->ssid);
1283 else
1284 IEEE80211_DEBUG_QOS
1285 ("QoS the network is QoS supported\n");
1286 }
1287 dst->qos_data.active = qos_active;
1288 dst->qos_data.old_param_count = old_param;
1289
1290 /* dst->last_associate is not overwritten */
1291 }
1292
1293 static inline int is_beacon(int fc)
1294 {
1295 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1296 }
1297
1298 static inline void ieee80211_process_probe_response(struct ieee80211_device
1299 *ieee, struct
1300 ieee80211_probe_response
1301 *beacon, struct ieee80211_rx_stats
1302 *stats)
1303 {
1304 struct net_device *dev = ieee->dev;
1305 struct ieee80211_network network;
1306 struct ieee80211_network *target;
1307 struct ieee80211_network *oldest = NULL;
1308 #ifdef CONFIG_IEEE80211_DEBUG
1309 struct ieee80211_info_element *info_element = beacon->info_element;
1310 #endif
1311 unsigned long flags;
1312
1313 IEEE80211_DEBUG_SCAN("'%s' (" MAC_FMT
1314 "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1315 escape_essid(info_element->data,
1316 info_element->len),
1317 MAC_ARG(beacon->header.addr3),
1318 (beacon->capability & (1 << 0xf)) ? '1' : '0',
1319 (beacon->capability & (1 << 0xe)) ? '1' : '0',
1320 (beacon->capability & (1 << 0xd)) ? '1' : '0',
1321 (beacon->capability & (1 << 0xc)) ? '1' : '0',
1322 (beacon->capability & (1 << 0xb)) ? '1' : '0',
1323 (beacon->capability & (1 << 0xa)) ? '1' : '0',
1324 (beacon->capability & (1 << 0x9)) ? '1' : '0',
1325 (beacon->capability & (1 << 0x8)) ? '1' : '0',
1326 (beacon->capability & (1 << 0x7)) ? '1' : '0',
1327 (beacon->capability & (1 << 0x6)) ? '1' : '0',
1328 (beacon->capability & (1 << 0x5)) ? '1' : '0',
1329 (beacon->capability & (1 << 0x4)) ? '1' : '0',
1330 (beacon->capability & (1 << 0x3)) ? '1' : '0',
1331 (beacon->capability & (1 << 0x2)) ? '1' : '0',
1332 (beacon->capability & (1 << 0x1)) ? '1' : '0',
1333 (beacon->capability & (1 << 0x0)) ? '1' : '0');
1334
1335 if (ieee80211_network_init(ieee, beacon, &network, stats)) {
1336 IEEE80211_DEBUG_SCAN("Dropped '%s' (" MAC_FMT ") via %s.\n",
1337 escape_essid(info_element->data,
1338 info_element->len),
1339 MAC_ARG(beacon->header.addr3),
1340 is_beacon(le16_to_cpu
1341 (beacon->header.
1342 frame_ctl)) ?
1343 "BEACON" : "PROBE RESPONSE");
1344 return;
1345 }
1346
1347 /* The network parsed correctly -- so now we scan our known networks
1348 * to see if we can find it in our list.
1349 *
1350 * NOTE: This search is definitely not optimized. Once its doing
1351 * the "right thing" we'll optimize it for efficiency if
1352 * necessary */
1353
1354 /* Search for this entry in the list and update it if it is
1355 * already there. */
1356
1357 spin_lock_irqsave(&ieee->lock, flags);
1358
1359 list_for_each_entry(target, &ieee->network_list, list) {
1360 if (is_same_network(target, &network))
1361 break;
1362
1363 if ((oldest == NULL) ||
1364 (target->last_scanned < oldest->last_scanned))
1365 oldest = target;
1366 }
1367
1368 /* If we didn't find a match, then get a new network slot to initialize
1369 * with this beacon's information */
1370 if (&target->list == &ieee->network_list) {
1371 if (list_empty(&ieee->network_free_list)) {
1372 /* If there are no more slots, expire the oldest */
1373 list_del(&oldest->list);
1374 target = oldest;
1375 IEEE80211_DEBUG_SCAN("Expired '%s' (" MAC_FMT ") from "
1376 "network list.\n",
1377 escape_essid(target->ssid,
1378 target->ssid_len),
1379 MAC_ARG(target->bssid));
1380 } else {
1381 /* Otherwise just pull from the free list */
1382 target = list_entry(ieee->network_free_list.next,
1383 struct ieee80211_network, list);
1384 list_del(ieee->network_free_list.next);
1385 }
1386
1387 #ifdef CONFIG_IEEE80211_DEBUG
1388 IEEE80211_DEBUG_SCAN("Adding '%s' (" MAC_FMT ") via %s.\n",
1389 escape_essid(network.ssid,
1390 network.ssid_len),
1391 MAC_ARG(network.bssid),
1392 is_beacon(le16_to_cpu
1393 (beacon->header.
1394 frame_ctl)) ?
1395 "BEACON" : "PROBE RESPONSE");
1396 #endif
1397 memcpy(target, &network, sizeof(*target));
1398 list_add_tail(&target->list, &ieee->network_list);
1399 } else {
1400 IEEE80211_DEBUG_SCAN("Updating '%s' (" MAC_FMT ") via %s.\n",
1401 escape_essid(target->ssid,
1402 target->ssid_len),
1403 MAC_ARG(target->bssid),
1404 is_beacon(le16_to_cpu
1405 (beacon->header.
1406 frame_ctl)) ?
1407 "BEACON" : "PROBE RESPONSE");
1408 update_network(target, &network);
1409 }
1410
1411 spin_unlock_irqrestore(&ieee->lock, flags);
1412
1413 if (is_beacon(le16_to_cpu(beacon->header.frame_ctl))) {
1414 if (ieee->handle_beacon != NULL)
1415 ieee->handle_beacon(dev, beacon, &network);
1416 } else {
1417 if (ieee->handle_probe_response != NULL)
1418 ieee->handle_probe_response(dev, beacon, &network);
1419 }
1420 }
1421
1422 void ieee80211_rx_mgt(struct ieee80211_device *ieee,
1423 struct ieee80211_hdr_4addr *header,
1424 struct ieee80211_rx_stats *stats)
1425 {
1426 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1427 case IEEE80211_STYPE_ASSOC_RESP:
1428 IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1429 WLAN_FC_GET_STYPE(le16_to_cpu
1430 (header->frame_ctl)));
1431 ieee80211_handle_assoc_resp(ieee,
1432 (struct ieee80211_assoc_response *)
1433 header, stats);
1434 break;
1435
1436 case IEEE80211_STYPE_REASSOC_RESP:
1437 IEEE80211_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1438 WLAN_FC_GET_STYPE(le16_to_cpu
1439 (header->frame_ctl)));
1440 break;
1441
1442 case IEEE80211_STYPE_PROBE_REQ:
1443 IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
1444 WLAN_FC_GET_STYPE(le16_to_cpu
1445 (header->frame_ctl)));
1446
1447 if (ieee->handle_probe_request != NULL)
1448 ieee->handle_probe_request(ieee->dev,
1449 (struct
1450 ieee80211_probe_request *)
1451 header, stats);
1452 break;
1453
1454 case IEEE80211_STYPE_PROBE_RESP:
1455 IEEE80211_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1456 WLAN_FC_GET_STYPE(le16_to_cpu
1457 (header->frame_ctl)));
1458 IEEE80211_DEBUG_SCAN("Probe response\n");
1459 ieee80211_process_probe_response(ieee,
1460 (struct
1461 ieee80211_probe_response *)
1462 header, stats);
1463 break;
1464
1465 case IEEE80211_STYPE_BEACON:
1466 IEEE80211_DEBUG_MGMT("received BEACON (%d)\n",
1467 WLAN_FC_GET_STYPE(le16_to_cpu
1468 (header->frame_ctl)));
1469 IEEE80211_DEBUG_SCAN("Beacon\n");
1470 ieee80211_process_probe_response(ieee,
1471 (struct
1472 ieee80211_probe_response *)
1473 header, stats);
1474 break;
1475 case IEEE80211_STYPE_AUTH:
1476
1477 IEEE80211_DEBUG_MGMT("recieved auth (%d)\n",
1478 WLAN_FC_GET_STYPE(le16_to_cpu
1479 (header->frame_ctl)));
1480
1481 if (ieee->handle_auth != NULL)
1482 ieee->handle_auth(ieee->dev,
1483 (struct ieee80211_auth *)header);
1484 break;
1485
1486 case IEEE80211_STYPE_DISASSOC:
1487 if (ieee->handle_disassoc != NULL)
1488 ieee->handle_disassoc(ieee->dev,
1489 (struct ieee80211_disassoc *)
1490 header);
1491 break;
1492
1493 case IEEE80211_STYPE_DEAUTH:
1494 printk("DEAUTH from AP\n");
1495 if (ieee->handle_deauth != NULL)
1496 ieee->handle_deauth(ieee->dev, (struct ieee80211_auth *)
1497 header);
1498 break;
1499 default:
1500 IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
1501 WLAN_FC_GET_STYPE(le16_to_cpu
1502 (header->frame_ctl)));
1503 IEEE80211_WARNING("%s: Unknown management packet: %d\n",
1504 ieee->dev->name,
1505 WLAN_FC_GET_STYPE(le16_to_cpu
1506 (header->frame_ctl)));
1507 break;
1508 }
1509 }
1510
1511 EXPORT_SYMBOL(ieee80211_rx_mgt);
1512 EXPORT_SYMBOL(ieee80211_rx);
linux v2.6.22.y-op