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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / net / wireless / intel / ipw2x00 / libipw_rx.c
blobdc4e91f58bb4a66dbe8af25ef074416074b23443
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Original code based Host AP (software wireless LAN access point) driver
4 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
5 *
6 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
7 * <j@w1.fi>
8 * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
9 * Copyright (c) 2004-2005, Intel Corporation
10 */
11
12 #include <linux/compiler.h>
13 #include <linux/errno.h>
14 #include <linux/if_arp.h>
15 #include <linux/in6.h>
16 #include <linux/gfp.h>
17 #include <linux/in.h>
18 #include <linux/ip.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/netdevice.h>
22 #include <linux/proc_fs.h>
23 #include <linux/skbuff.h>
24 #include <linux/tcp.h>
25 #include <linux/types.h>
26 #include <linux/wireless.h>
27 #include <linux/etherdevice.h>
28 #include <linux/uaccess.h>
29 #include <linux/ctype.h>
30 #include "libipw.h"
31
32 static void libipw_monitor_rx(struct libipw_device *ieee,
33 struct sk_buff *skb,
34 struct libipw_rx_stats *rx_stats)
35 {
36 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
37 u16 fc = le16_to_cpu(hdr->frame_control);
38
39 skb->dev = ieee->dev;
40 skb_reset_mac_header(skb);
41 skb_pull(skb, libipw_get_hdrlen(fc));
42 skb->pkt_type = PACKET_OTHERHOST;
43 skb->protocol = htons(ETH_P_80211_RAW);
44 memset(skb->cb, 0, sizeof(skb->cb));
45 netif_rx(skb);
46 }
47
48 /* Called only as a tasklet (software IRQ) */
49 static struct libipw_frag_entry *libipw_frag_cache_find(struct
50 libipw_device
51 *ieee,
52 unsigned int seq,
53 unsigned int frag,
54 u8 * src,
55 u8 * dst)
56 {
57 struct libipw_frag_entry *entry;
58 int i;
59
60 for (i = 0; i < LIBIPW_FRAG_CACHE_LEN; i++) {
61 entry = &ieee->frag_cache[i];
62 if (entry->skb != NULL &&
63 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
64 LIBIPW_DEBUG_FRAG("expiring fragment cache entry "
65 "seq=%u last_frag=%u\n",
66 entry->seq, entry->last_frag);
67 dev_kfree_skb_any(entry->skb);
68 entry->skb = NULL;
69 }
70
71 if (entry->skb != NULL && entry->seq == seq &&
72 (entry->last_frag + 1 == frag || frag == -1) &&
73 ether_addr_equal(entry->src_addr, src) &&
74 ether_addr_equal(entry->dst_addr, dst))
75 return entry;
76 }
77
78 return NULL;
79 }
80
81 /* Called only as a tasklet (software IRQ) */
82 static struct sk_buff *libipw_frag_cache_get(struct libipw_device *ieee,
83 struct libipw_hdr_4addr *hdr)
84 {
85 struct sk_buff *skb = NULL;
86 u16 sc;
87 unsigned int frag, seq;
88 struct libipw_frag_entry *entry;
89
90 sc = le16_to_cpu(hdr->seq_ctl);
91 frag = WLAN_GET_SEQ_FRAG(sc);
92 seq = WLAN_GET_SEQ_SEQ(sc);
93
94 if (frag == 0) {
95 /* Reserve enough space to fit maximum frame length */
96 skb = dev_alloc_skb(ieee->dev->mtu +
97 sizeof(struct libipw_hdr_4addr) +
98 8 /* LLC */ +
99 2 /* alignment */ +
100 8 /* WEP */ + ETH_ALEN /* WDS */ );
101 if (skb == NULL)
102 return NULL;
103
104 entry = &ieee->frag_cache[ieee->frag_next_idx];
105 ieee->frag_next_idx++;
106 if (ieee->frag_next_idx >= LIBIPW_FRAG_CACHE_LEN)
107 ieee->frag_next_idx = 0;
108
109 if (entry->skb != NULL)
110 dev_kfree_skb_any(entry->skb);
111
112 entry->first_frag_time = jiffies;
113 entry->seq = seq;
114 entry->last_frag = frag;
115 entry->skb = skb;
116 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
117 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
118 } else {
119 /* received a fragment of a frame for which the head fragment
120 * should have already been received */
121 entry = libipw_frag_cache_find(ieee, seq, frag, hdr->addr2,
122 hdr->addr1);
123 if (entry != NULL) {
124 entry->last_frag = frag;
125 skb = entry->skb;
126 }
127 }
128
129 return skb;
130 }
131
132 /* Called only as a tasklet (software IRQ) */
133 static int libipw_frag_cache_invalidate(struct libipw_device *ieee,
134 struct libipw_hdr_4addr *hdr)
135 {
136 u16 sc;
137 unsigned int seq;
138 struct libipw_frag_entry *entry;
139
140 sc = le16_to_cpu(hdr->seq_ctl);
141 seq = WLAN_GET_SEQ_SEQ(sc);
142
143 entry = libipw_frag_cache_find(ieee, seq, -1, hdr->addr2,
144 hdr->addr1);
145
146 if (entry == NULL) {
147 LIBIPW_DEBUG_FRAG("could not invalidate fragment cache "
148 "entry (seq=%u)\n", seq);
149 return -1;
150 }
151
152 entry->skb = NULL;
153 return 0;
154 }
155
156 #ifdef NOT_YET
157 /* libipw_rx_frame_mgtmt
158 *
159 * Responsible for handling management control frames
160 *
161 * Called by libipw_rx */
162 static int
163 libipw_rx_frame_mgmt(struct libipw_device *ieee, struct sk_buff *skb,
164 struct libipw_rx_stats *rx_stats, u16 type,
165 u16 stype)
166 {
167 if (ieee->iw_mode == IW_MODE_MASTER) {
168 printk(KERN_DEBUG "%s: Master mode not yet supported.\n",
169 ieee->dev->name);
170 return 0;
171 /*
172 hostap_update_sta_ps(ieee, (struct hostap_libipw_hdr_4addr *)
173 skb->data);*/
174 }
175
176 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
177 if (stype == WLAN_FC_STYPE_BEACON &&
178 ieee->iw_mode == IW_MODE_MASTER) {
179 struct sk_buff *skb2;
180 /* Process beacon frames also in kernel driver to
181 * update STA(AP) table statistics */
182 skb2 = skb_clone(skb, GFP_ATOMIC);
183 if (skb2)
184 hostap_rx(skb2->dev, skb2, rx_stats);
185 }
186
187 /* send management frames to the user space daemon for
188 * processing */
189 ieee->apdevstats.rx_packets++;
190 ieee->apdevstats.rx_bytes += skb->len;
191 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
192 return 0;
193 }
194
195 if (ieee->iw_mode == IW_MODE_MASTER) {
196 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
197 printk(KERN_DEBUG "%s: unknown management frame "
198 "(type=0x%02x, stype=0x%02x) dropped\n",
199 skb->dev->name, type, stype);
200 return -1;
201 }
202
203 hostap_rx(skb->dev, skb, rx_stats);
204 return 0;
205 }
206
207 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
208 "received in non-Host AP mode\n", skb->dev->name);
209 return -1;
210 }
211 #endif
212
213 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
214 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
215 static unsigned char libipw_rfc1042_header[] =
216 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
217
218 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
219 static unsigned char libipw_bridge_tunnel_header[] =
220 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
221 /* No encapsulation header if EtherType < 0x600 (=length) */
222
223 /* Called by libipw_rx_frame_decrypt */
224 static int libipw_is_eapol_frame(struct libipw_device *ieee,
225 struct sk_buff *skb)
226 {
227 struct net_device *dev = ieee->dev;
228 u16 fc, ethertype;
229 struct libipw_hdr_3addr *hdr;
230 u8 *pos;
231
232 if (skb->len < 24)
233 return 0;
234
235 hdr = (struct libipw_hdr_3addr *)skb->data;
236 fc = le16_to_cpu(hdr->frame_ctl);
237
238 /* check that the frame is unicast frame to us */
239 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
240 IEEE80211_FCTL_TODS &&
241 ether_addr_equal(hdr->addr1, dev->dev_addr) &&
242 ether_addr_equal(hdr->addr3, dev->dev_addr)) {
243 /* ToDS frame with own addr BSSID and DA */
244 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
245 IEEE80211_FCTL_FROMDS &&
246 ether_addr_equal(hdr->addr1, dev->dev_addr)) {
247 /* FromDS frame with own addr as DA */
248 } else
249 return 0;
250
251 if (skb->len < 24 + 8)
252 return 0;
253
254 /* check for port access entity Ethernet type */
255 pos = skb->data + 24;
256 ethertype = (pos[6] << 8) | pos[7];
257 if (ethertype == ETH_P_PAE)
258 return 1;
259
260 return 0;
261 }
262
263 /* Called only as a tasklet (software IRQ), by libipw_rx */
264 static int
265 libipw_rx_frame_decrypt(struct libipw_device *ieee, struct sk_buff *skb,
266 struct libipw_crypt_data *crypt)
267 {
268 struct libipw_hdr_3addr *hdr;
269 int res, hdrlen;
270
271 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
272 return 0;
273
274 hdr = (struct libipw_hdr_3addr *)skb->data;
275 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
276
277 atomic_inc(&crypt->refcnt);
278 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
279 atomic_dec(&crypt->refcnt);
280 if (res < 0) {
281 LIBIPW_DEBUG_DROP("decryption failed (SA=%pM) res=%d\n",
282 hdr->addr2, res);
283 if (res == -2)
284 LIBIPW_DEBUG_DROP("Decryption failed ICV "
285 "mismatch (key %d)\n",
286 skb->data[hdrlen + 3] >> 6);
287 ieee->ieee_stats.rx_discards_undecryptable++;
288 return -1;
289 }
290
291 return res;
292 }
293
294 /* Called only as a tasklet (software IRQ), by libipw_rx */
295 static int
296 libipw_rx_frame_decrypt_msdu(struct libipw_device *ieee,
297 struct sk_buff *skb, int keyidx,
298 struct libipw_crypt_data *crypt)
299 {
300 struct libipw_hdr_3addr *hdr;
301 int res, hdrlen;
302
303 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
304 return 0;
305
306 hdr = (struct libipw_hdr_3addr *)skb->data;
307 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
308
309 atomic_inc(&crypt->refcnt);
310 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
311 atomic_dec(&crypt->refcnt);
312 if (res < 0) {
313 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
314 " (SA=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2,
315 keyidx);
316 return -1;
317 }
318
319 return 0;
320 }
321
322 /* All received frames are sent to this function. @skb contains the frame in
323 * IEEE 802.11 format, i.e., in the format it was sent over air.
324 * This function is called only as a tasklet (software IRQ). */
325 int libipw_rx(struct libipw_device *ieee, struct sk_buff *skb,
326 struct libipw_rx_stats *rx_stats)
327 {
328 struct net_device *dev = ieee->dev;
329 struct libipw_hdr_4addr *hdr;
330 size_t hdrlen;
331 u16 fc, type, stype, sc;
332 unsigned int frag;
333 u8 *payload;
334 u16 ethertype;
335 #ifdef NOT_YET
336 struct net_device *wds = NULL;
337 struct sk_buff *skb2 = NULL;
338 struct net_device *wds = NULL;
339 int frame_authorized = 0;
340 int from_assoc_ap = 0;
341 void *sta = NULL;
342 #endif
343 u8 dst[ETH_ALEN];
344 u8 src[ETH_ALEN];
345 struct libipw_crypt_data *crypt = NULL;
346 int keyidx = 0;
347 int can_be_decrypted = 0;
348
349 hdr = (struct libipw_hdr_4addr *)skb->data;
350 if (skb->len < 10) {
351 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
352 goto rx_dropped;
353 }
354
355 fc = le16_to_cpu(hdr->frame_ctl);
356 type = WLAN_FC_GET_TYPE(fc);
357 stype = WLAN_FC_GET_STYPE(fc);
358 sc = le16_to_cpu(hdr->seq_ctl);
359 frag = WLAN_GET_SEQ_FRAG(sc);
360 hdrlen = libipw_get_hdrlen(fc);
361
362 if (skb->len < hdrlen) {
363 printk(KERN_INFO "%s: invalid SKB length %d\n",
364 dev->name, skb->len);
365 goto rx_dropped;
366 }
367
368 /* Put this code here so that we avoid duplicating it in all
369 * Rx paths. - Jean II */
370 #ifdef CONFIG_WIRELESS_EXT
371 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
372 /* If spy monitoring on */
373 if (ieee->spy_data.spy_number > 0) {
374 struct iw_quality wstats;
375
376 wstats.updated = 0;
377 if (rx_stats->mask & LIBIPW_STATMASK_RSSI) {
378 wstats.level = rx_stats->signal;
379 wstats.updated |= IW_QUAL_LEVEL_UPDATED;
380 } else
381 wstats.updated |= IW_QUAL_LEVEL_INVALID;
382
383 if (rx_stats->mask & LIBIPW_STATMASK_NOISE) {
384 wstats.noise = rx_stats->noise;
385 wstats.updated |= IW_QUAL_NOISE_UPDATED;
386 } else
387 wstats.updated |= IW_QUAL_NOISE_INVALID;
388
389 if (rx_stats->mask & LIBIPW_STATMASK_SIGNAL) {
390 wstats.qual = rx_stats->signal;
391 wstats.updated |= IW_QUAL_QUAL_UPDATED;
392 } else
393 wstats.updated |= IW_QUAL_QUAL_INVALID;
394
395 /* Update spy records */
396 libipw_spy_update(ieee->dev, hdr->addr2, &wstats);
397 }
398 #endif /* IW_WIRELESS_SPY */
399 #endif /* CONFIG_WIRELESS_EXT */
400
401 #ifdef NOT_YET
402 hostap_update_rx_stats(local->ap, hdr, rx_stats);
403 #endif
404
405 if (ieee->iw_mode == IW_MODE_MONITOR) {
406 dev->stats.rx_packets++;
407 dev->stats.rx_bytes += skb->len;
408 libipw_monitor_rx(ieee, skb, rx_stats);
409 return 1;
410 }
411
412 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
413 is_broadcast_ether_addr(hdr->addr2)) ?
414 ieee->host_mc_decrypt : ieee->host_decrypt;
415
416 if (can_be_decrypted) {
417 if (skb->len >= hdrlen + 3) {
418 /* Top two-bits of byte 3 are the key index */
419 keyidx = skb->data[hdrlen + 3] >> 6;
420 }
421
422 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx
423 * is only allowed 2-bits of storage, no value of keyidx can
424 * be provided via above code that would result in keyidx
425 * being out of range */
426 crypt = ieee->crypt_info.crypt[keyidx];
427
428 #ifdef NOT_YET
429 sta = NULL;
430
431 /* Use station specific key to override default keys if the
432 * receiver address is a unicast address ("individual RA"). If
433 * bcrx_sta_key parameter is set, station specific key is used
434 * even with broad/multicast targets (this is against IEEE
435 * 802.11, but makes it easier to use different keys with
436 * stations that do not support WEP key mapping). */
437
438 if (is_unicast_ether_addr(hdr->addr1) || local->bcrx_sta_key)
439 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
440 &sta);
441 #endif
442
443 /* allow NULL decrypt to indicate an station specific override
444 * for default encryption */
445 if (crypt && (crypt->ops == NULL ||
446 crypt->ops->decrypt_mpdu == NULL))
447 crypt = NULL;
448
449 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
450 /* This seems to be triggered by some (multicast?)
451 * frames from other than current BSS, so just drop the
452 * frames silently instead of filling system log with
453 * these reports. */
454 LIBIPW_DEBUG_DROP("Decryption failed (not set)"
455 " (SA=%pM)\n", hdr->addr2);
456 ieee->ieee_stats.rx_discards_undecryptable++;
457 goto rx_dropped;
458 }
459 }
460 #ifdef NOT_YET
461 if (type != WLAN_FC_TYPE_DATA) {
462 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
463 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
464 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
465 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
466 "from %pM\n", dev->name, hdr->addr2);
467 /* TODO: could inform hostapd about this so that it
468 * could send auth failure report */
469 goto rx_dropped;
470 }
471
472 if (libipw_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
473 goto rx_dropped;
474 else
475 goto rx_exit;
476 }
477 #endif
478 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
479 if (sc == ieee->prev_seq_ctl)
480 goto rx_dropped;
481 else
482 ieee->prev_seq_ctl = sc;
483
484 /* Data frame - extract src/dst addresses */
485 if (skb->len < LIBIPW_3ADDR_LEN)
486 goto rx_dropped;
487
488 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
489 case IEEE80211_FCTL_FROMDS:
490 memcpy(dst, hdr->addr1, ETH_ALEN);
491 memcpy(src, hdr->addr3, ETH_ALEN);
492 break;
493 case IEEE80211_FCTL_TODS:
494 memcpy(dst, hdr->addr3, ETH_ALEN);
495 memcpy(src, hdr->addr2, ETH_ALEN);
496 break;
497 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
498 if (skb->len < LIBIPW_4ADDR_LEN)
499 goto rx_dropped;
500 memcpy(dst, hdr->addr3, ETH_ALEN);
501 memcpy(src, hdr->addr4, ETH_ALEN);
502 break;
503 default:
504 memcpy(dst, hdr->addr1, ETH_ALEN);
505 memcpy(src, hdr->addr2, ETH_ALEN);
506 break;
507 }
508
509 #ifdef NOT_YET
510 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
511 goto rx_dropped;
512 if (wds) {
513 skb->dev = dev = wds;
514 stats = hostap_get_stats(dev);
515 }
516
517 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
518 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
519 IEEE80211_FCTL_FROMDS && ieee->stadev &&
520 ether_addr_equal(hdr->addr2, ieee->assoc_ap_addr)) {
521 /* Frame from BSSID of the AP for which we are a client */
522 skb->dev = dev = ieee->stadev;
523 stats = hostap_get_stats(dev);
524 from_assoc_ap = 1;
525 }
526 #endif
527
528 #ifdef NOT_YET
529 if ((ieee->iw_mode == IW_MODE_MASTER ||
530 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
531 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
532 wds != NULL)) {
533 case AP_RX_CONTINUE_NOT_AUTHORIZED:
534 frame_authorized = 0;
535 break;
536 case AP_RX_CONTINUE:
537 frame_authorized = 1;
538 break;
539 case AP_RX_DROP:
540 goto rx_dropped;
541 case AP_RX_EXIT:
542 goto rx_exit;
543 }
544 }
545 #endif
546
547 /* Nullfunc frames may have PS-bit set, so they must be passed to
548 * hostap_handle_sta_rx() before being dropped here. */
549
550 stype &= ~IEEE80211_STYPE_QOS_DATA;
551
552 if (stype != IEEE80211_STYPE_DATA &&
553 stype != IEEE80211_STYPE_DATA_CFACK &&
554 stype != IEEE80211_STYPE_DATA_CFPOLL &&
555 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
556 if (stype != IEEE80211_STYPE_NULLFUNC)
557 LIBIPW_DEBUG_DROP("RX: dropped data frame "
558 "with no data (type=0x%02x, "
559 "subtype=0x%02x, len=%d)\n",
560 type, stype, skb->len);
561 goto rx_dropped;
562 }
563
564 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
565
566 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
567 (keyidx = libipw_rx_frame_decrypt(ieee, skb, crypt)) < 0)
568 goto rx_dropped;
569
570 hdr = (struct libipw_hdr_4addr *)skb->data;
571
572 /* skb: hdr + (possibly fragmented) plaintext payload */
573 // PR: FIXME: hostap has additional conditions in the "if" below:
574 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
575 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
576 int flen;
577 struct sk_buff *frag_skb = libipw_frag_cache_get(ieee, hdr);
578 LIBIPW_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
579
580 if (!frag_skb) {
581 LIBIPW_DEBUG(LIBIPW_DL_RX | LIBIPW_DL_FRAG,
582 "Rx cannot get skb from fragment "
583 "cache (morefrag=%d seq=%u frag=%u)\n",
584 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
585 WLAN_GET_SEQ_SEQ(sc), frag);
586 goto rx_dropped;
587 }
588
589 flen = skb->len;
590 if (frag != 0)
591 flen -= hdrlen;
592
593 if (frag_skb->tail + flen > frag_skb->end) {
594 printk(KERN_WARNING "%s: host decrypted and "
595 "reassembled frame did not fit skb\n",
596 dev->name);
597 libipw_frag_cache_invalidate(ieee, hdr);
598 goto rx_dropped;
599 }
600
601 if (frag == 0) {
602 /* copy first fragment (including full headers) into
603 * beginning of the fragment cache skb */
604 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);
605 } else {
606 /* append frame payload to the end of the fragment
607 * cache skb */
608 skb_copy_from_linear_data_offset(skb, hdrlen,
609 skb_put(frag_skb, flen), flen);
610 }
611 dev_kfree_skb_any(skb);
612 skb = NULL;
613
614 if (fc & IEEE80211_FCTL_MOREFRAGS) {
615 /* more fragments expected - leave the skb in fragment
616 * cache for now; it will be delivered to upper layers
617 * after all fragments have been received */
618 goto rx_exit;
619 }
620
621 /* this was the last fragment and the frame will be
622 * delivered, so remove skb from fragment cache */
623 skb = frag_skb;
624 hdr = (struct libipw_hdr_4addr *)skb->data;
625 libipw_frag_cache_invalidate(ieee, hdr);
626 }
627
628 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
629 * encrypted/authenticated */
630 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
631 libipw_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
632 goto rx_dropped;
633
634 hdr = (struct libipw_hdr_4addr *)skb->data;
635 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
636 if ( /*ieee->ieee802_1x && */
637 libipw_is_eapol_frame(ieee, skb)) {
638 /* pass unencrypted EAPOL frames even if encryption is
639 * configured */
640 } else {
641 LIBIPW_DEBUG_DROP("encryption configured, but RX "
642 "frame not encrypted (SA=%pM)\n",
643 hdr->addr2);
644 goto rx_dropped;
645 }
646 }
647
648 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
649 !libipw_is_eapol_frame(ieee, skb)) {
650 LIBIPW_DEBUG_DROP("dropped unencrypted RX data "
651 "frame from %pM (drop_unencrypted=1)\n",
652 hdr->addr2);
653 goto rx_dropped;
654 }
655
656 /* If the frame was decrypted in hardware, we may need to strip off
657 * any security data (IV, ICV, etc) that was left behind */
658 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&
659 ieee->host_strip_iv_icv) {
660 int trimlen = 0;
661
662 /* Top two-bits of byte 3 are the key index */
663 if (skb->len >= hdrlen + 3)
664 keyidx = skb->data[hdrlen + 3] >> 6;
665
666 /* To strip off any security data which appears before the
667 * payload, we simply increase hdrlen (as the header gets
668 * chopped off immediately below). For the security data which
669 * appears after the payload, we use skb_trim. */
670
671 switch (ieee->sec.encode_alg[keyidx]) {
672 case SEC_ALG_WEP:
673 /* 4 byte IV */
674 hdrlen += 4;
675 /* 4 byte ICV */
676 trimlen = 4;
677 break;
678 case SEC_ALG_TKIP:
679 /* 4 byte IV, 4 byte ExtIV */
680 hdrlen += 8;
681 /* 8 byte MIC, 4 byte ICV */
682 trimlen = 12;
683 break;
684 case SEC_ALG_CCMP:
685 /* 8 byte CCMP header */
686 hdrlen += 8;
687 /* 8 byte MIC */
688 trimlen = 8;
689 break;
690 }
691
692 if (skb->len < trimlen)
693 goto rx_dropped;
694
695 __skb_trim(skb, skb->len - trimlen);
696
697 if (skb->len < hdrlen)
698 goto rx_dropped;
699 }
700
701 /* skb: hdr + (possible reassembled) full plaintext payload */
702
703 payload = skb->data + hdrlen;
704 ethertype = (payload[6] << 8) | payload[7];
705
706 #ifdef NOT_YET
707 /* If IEEE 802.1X is used, check whether the port is authorized to send
708 * the received frame. */
709 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
710 if (ethertype == ETH_P_PAE) {
711 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
712 dev->name);
713 if (ieee->hostapd && ieee->apdev) {
714 /* Send IEEE 802.1X frames to the user
715 * space daemon for processing */
716 prism2_rx_80211(ieee->apdev, skb, rx_stats,
717 PRISM2_RX_MGMT);
718 ieee->apdevstats.rx_packets++;
719 ieee->apdevstats.rx_bytes += skb->len;
720 goto rx_exit;
721 }
722 } else if (!frame_authorized) {
723 printk(KERN_DEBUG "%s: dropped frame from "
724 "unauthorized port (IEEE 802.1X): "
725 "ethertype=0x%04x\n", dev->name, ethertype);
726 goto rx_dropped;
727 }
728 }
729 #endif
730
731 /* convert hdr + possible LLC headers into Ethernet header */
732 if (skb->len - hdrlen >= 8 &&
733 ((memcmp(payload, libipw_rfc1042_header, SNAP_SIZE) == 0 &&
734 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
735 memcmp(payload, libipw_bridge_tunnel_header, SNAP_SIZE) == 0)) {
736 /* remove RFC1042 or Bridge-Tunnel encapsulation and
737 * replace EtherType */
738 skb_pull(skb, hdrlen + SNAP_SIZE);
739 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
740 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
741 } else {
742 __be16 len;
743 /* Leave Ethernet header part of hdr and full payload */
744 skb_pull(skb, hdrlen);
745 len = htons(skb->len);
746 memcpy(skb_push(skb, 2), &len, 2);
747 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
748 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
749 }
750
751 #ifdef NOT_YET
752 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
753 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
754 /* Non-standard frame: get addr4 from its bogus location after
755 * the payload */
756 skb_copy_to_linear_data_offset(skb, ETH_ALEN,
757 skb->data + skb->len - ETH_ALEN,
758 ETH_ALEN);
759 skb_trim(skb, skb->len - ETH_ALEN);
760 }
761 #endif
762
763 dev->stats.rx_packets++;
764 dev->stats.rx_bytes += skb->len;
765
766 #ifdef NOT_YET
767 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
768 if (is_multicast_ether_addr(dst)) {
769 /* copy multicast frame both to the higher layers and
770 * to the wireless media */
771 ieee->ap->bridged_multicast++;
772 skb2 = skb_clone(skb, GFP_ATOMIC);
773 if (skb2 == NULL)
774 printk(KERN_DEBUG "%s: skb_clone failed for "
775 "multicast frame\n", dev->name);
776 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
777 /* send frame directly to the associated STA using
778 * wireless media and not passing to higher layers */
779 ieee->ap->bridged_unicast++;
780 skb2 = skb;
781 skb = NULL;
782 }
783 }
784
785 if (skb2 != NULL) {
786 /* send to wireless media */
787 skb2->dev = dev;
788 skb2->protocol = htons(ETH_P_802_3);
789 skb_reset_mac_header(skb2);
790 skb_reset_network_header(skb2);
791 /* skb2->network_header += ETH_HLEN; */
792 dev_queue_xmit(skb2);
793 }
794 #endif
795
796 if (skb) {
797 skb->protocol = eth_type_trans(skb, dev);
798 memset(skb->cb, 0, sizeof(skb->cb));
799 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
800 if (netif_rx(skb) == NET_RX_DROP) {
801 /* netif_rx always succeeds, but it might drop
802 * the packet. If it drops the packet, we log that
803 * in our stats. */
804 LIBIPW_DEBUG_DROP
805 ("RX: netif_rx dropped the packet\n");
806 dev->stats.rx_dropped++;
807 }
808 }
809
810 rx_exit:
811 #ifdef NOT_YET
812 if (sta)
813 hostap_handle_sta_release(sta);
814 #endif
815 return 1;
816
817 rx_dropped:
818 dev->stats.rx_dropped++;
819
820 /* Returning 0 indicates to caller that we have not handled the SKB--
821 * so it is still allocated and can be used again by underlying
822 * hardware as a DMA target */
823 return 0;
824 }
825
826 /* Filter out unrelated packets, call libipw_rx[_mgt]
827 * This function takes over the skb, it should not be used again after calling
828 * this function. */
829 void libipw_rx_any(struct libipw_device *ieee,
830 struct sk_buff *skb, struct libipw_rx_stats *stats)
831 {
832 struct libipw_hdr_4addr *hdr;
833 int is_packet_for_us;
834 u16 fc;
835
836 if (ieee->iw_mode == IW_MODE_MONITOR) {
837 if (!libipw_rx(ieee, skb, stats))
838 dev_kfree_skb_irq(skb);
839 return;
840 }
841
842 if (skb->len < sizeof(struct ieee80211_hdr))
843 goto drop_free;
844
845 hdr = (struct libipw_hdr_4addr *)skb->data;
846 fc = le16_to_cpu(hdr->frame_ctl);
847
848 if ((fc & IEEE80211_FCTL_VERS) != 0)
849 goto drop_free;
850
851 switch (fc & IEEE80211_FCTL_FTYPE) {
852 case IEEE80211_FTYPE_MGMT:
853 if (skb->len < sizeof(struct libipw_hdr_3addr))
854 goto drop_free;
855 libipw_rx_mgt(ieee, hdr, stats);
856 dev_kfree_skb_irq(skb);
857 return;
858 case IEEE80211_FTYPE_DATA:
859 break;
860 case IEEE80211_FTYPE_CTL:
861 return;
862 default:
863 return;
864 }
865
866 is_packet_for_us = 0;
867 switch (ieee->iw_mode) {
868 case IW_MODE_ADHOC:
869 /* our BSS and not from/to DS */
870 if (ether_addr_equal(hdr->addr3, ieee->bssid) &&
871 ((fc & (IEEE80211_FCTL_TODS + IEEE80211_FCTL_FROMDS)) == 0)) {
872 /* promisc: get all */
873 if (ieee->dev->flags & IFF_PROMISC)
874 is_packet_for_us = 1;
875 /* to us */
876 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr))
877 is_packet_for_us = 1;
878 /* mcast */
879 else if (is_multicast_ether_addr(hdr->addr1))
880 is_packet_for_us = 1;
881 }
882 break;
883 case IW_MODE_INFRA:
884 /* our BSS (== from our AP) and from DS */
885 if (ether_addr_equal(hdr->addr2, ieee->bssid) &&
886 ((fc & (IEEE80211_FCTL_TODS + IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS)) {
887 /* promisc: get all */
888 if (ieee->dev->flags & IFF_PROMISC)
889 is_packet_for_us = 1;
890 /* to us */
891 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr))
892 is_packet_for_us = 1;
893 /* mcast */
894 else if (is_multicast_ether_addr(hdr->addr1)) {
895 /* not our own packet bcasted from AP */
896 if (!ether_addr_equal(hdr->addr3, ieee->dev->dev_addr))
897 is_packet_for_us = 1;
898 }
899 }
900 break;
901 default:
902 /* ? */
903 break;
904 }
905
906 if (is_packet_for_us)
907 if (!libipw_rx(ieee, skb, stats))
908 dev_kfree_skb_irq(skb);
909 return;
910
911 drop_free:
912 dev_kfree_skb_irq(skb);
913 ieee->dev->stats.rx_dropped++;
914 }
915
916 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
917
918 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
919
920 /*
921 * Make the structure we read from the beacon packet to have
922 * the right values
923 */
924 static int libipw_verify_qos_info(struct libipw_qos_information_element
925 *info_element, int sub_type)
926 {
927 if (info_element->elementID != QOS_ELEMENT_ID)
928 return -1;
929 if (info_element->qui_subtype != sub_type)
930 return -1;
931 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
932 return -1;
933 if (info_element->qui_type != QOS_OUI_TYPE)
934 return -1;
935 if (info_element->version != QOS_VERSION_1)
936 return -1;
937
938 return 0;
939 }
940
941 /*
942 * Parse a QoS parameter element
943 */
944 static int libipw_read_qos_param_element(
945 struct libipw_qos_parameter_info *element_param,
946 struct libipw_info_element *info_element)
947 {
948 size_t size = sizeof(*element_param);
949
950 if (!element_param || !info_element || info_element->len != size - 2)
951 return -1;
952
953 memcpy(element_param, info_element, size);
954 return libipw_verify_qos_info(&element_param->info_element,
955 QOS_OUI_PARAM_SUB_TYPE);
956 }
957
958 /*
959 * Parse a QoS information element
960 */
961 static int libipw_read_qos_info_element(
962 struct libipw_qos_information_element *element_info,
963 struct libipw_info_element *info_element)
964 {
965 size_t size = sizeof(struct libipw_qos_information_element) - 2;
966
967 if (!element_info || !info_element || info_element->len != size - 2)
968 return -1;
969
970 memcpy(element_info, info_element, size);
971 return libipw_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
972 }
973
974 /*
975 * Write QoS parameters from the ac parameters.
976 */
977 static void libipw_qos_convert_ac_to_parameters(struct
978 libipw_qos_parameter_info
979 *param_elm, struct
980 libipw_qos_parameters
981 *qos_param)
982 {
983 int i;
984 struct libipw_qos_ac_parameter *ac_params;
985 u32 txop;
986 u8 cw_min;
987 u8 cw_max;
988
989 for (i = 0; i < QOS_QUEUE_NUM; i++) {
990 ac_params = &(param_elm->ac_params_record[i]);
991
992 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
993 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
994
995 cw_min = ac_params->ecw_min_max & 0x0F;
996 qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1);
997
998 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
999 qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1);
1000
1001 qos_param->flag[i] =
1002 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1003
1004 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
1005 qos_param->tx_op_limit[i] = cpu_to_le16(txop);
1006 }
1007 }
1008
1009 /*
1010 * we have a generic data element which it may contain QoS information or
1011 * parameters element. check the information element length to decide
1012 * which type to read
1013 */
1014 static int libipw_parse_qos_info_param_IE(struct libipw_info_element
1015 *info_element,
1016 struct libipw_network *network)
1017 {
1018 int rc = 0;
1019 struct libipw_qos_parameters *qos_param = NULL;
1020 struct libipw_qos_information_element qos_info_element;
1021
1022 rc = libipw_read_qos_info_element(&qos_info_element, info_element);
1023
1024 if (rc == 0) {
1025 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1026 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1027 } else {
1028 struct libipw_qos_parameter_info param_element;
1029
1030 rc = libipw_read_qos_param_element(&param_element,
1031 info_element);
1032 if (rc == 0) {
1033 qos_param = &(network->qos_data.parameters);
1034 libipw_qos_convert_ac_to_parameters(&param_element,
1035 qos_param);
1036 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1037 network->qos_data.param_count =
1038 param_element.info_element.ac_info & 0x0F;
1039 }
1040 }
1041
1042 if (rc == 0) {
1043 LIBIPW_DEBUG_QOS("QoS is supported\n");
1044 network->qos_data.supported = 1;
1045 }
1046 return rc;
1047 }
1048
1049 #ifdef CONFIG_LIBIPW_DEBUG
1050 #define MFIE_STRING(x) case WLAN_EID_ ##x: return #x
1051
1052 static const char *get_info_element_string(u16 id)
1053 {
1054 switch (id) {
1055 MFIE_STRING(SSID);
1056 MFIE_STRING(SUPP_RATES);
1057 MFIE_STRING(FH_PARAMS);
1058 MFIE_STRING(DS_PARAMS);
1059 MFIE_STRING(CF_PARAMS);
1060 MFIE_STRING(TIM);
1061 MFIE_STRING(IBSS_PARAMS);
1062 MFIE_STRING(COUNTRY);
1063 MFIE_STRING(REQUEST);
1064 MFIE_STRING(CHALLENGE);
1065 MFIE_STRING(PWR_CONSTRAINT);
1066 MFIE_STRING(PWR_CAPABILITY);
1067 MFIE_STRING(TPC_REQUEST);
1068 MFIE_STRING(TPC_REPORT);
1069 MFIE_STRING(SUPPORTED_CHANNELS);
1070 MFIE_STRING(CHANNEL_SWITCH);
1071 MFIE_STRING(MEASURE_REQUEST);
1072 MFIE_STRING(MEASURE_REPORT);
1073 MFIE_STRING(QUIET);
1074 MFIE_STRING(IBSS_DFS);
1075 MFIE_STRING(ERP_INFO);
1076 MFIE_STRING(RSN);
1077 MFIE_STRING(EXT_SUPP_RATES);
1078 MFIE_STRING(VENDOR_SPECIFIC);
1079 MFIE_STRING(QOS_PARAMETER);
1080 default:
1081 return "UNKNOWN";
1082 }
1083 }
1084 #endif
1085
1086 static int libipw_parse_info_param(struct libipw_info_element
1087 *info_element, u16 length,
1088 struct libipw_network *network)
1089 {
1090 u8 i;
1091 #ifdef CONFIG_LIBIPW_DEBUG
1092 char rates_str[64];
1093 char *p;
1094 #endif
1095
1096 while (length >= sizeof(*info_element)) {
1097 if (sizeof(*info_element) + info_element->len > length) {
1098 LIBIPW_DEBUG_MGMT("Info elem: parse failed: "
1099 "info_element->len + 2 > left : "
1100 "info_element->len+2=%zd left=%d, id=%d.\n",
1101 info_element->len +
1102 sizeof(*info_element),
1103 length, info_element->id);
1104 /* We stop processing but don't return an error here
1105 * because some misbehaviour APs break this rule. ie.
1106 * Orinoco AP1000. */
1107 break;
1108 }
1109
1110 switch (info_element->id) {
1111 case WLAN_EID_SSID:
1112 network->ssid_len = min(info_element->len,
1113 (u8) IW_ESSID_MAX_SIZE);
1114 memcpy(network->ssid, info_element->data,
1115 network->ssid_len);
1116 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1117 memset(network->ssid + network->ssid_len, 0,
1118 IW_ESSID_MAX_SIZE - network->ssid_len);
1119
1120 LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%*pE' len=%d.\n",
1121 network->ssid_len, network->ssid,
1122 network->ssid_len);
1123 break;
1124
1125 case WLAN_EID_SUPP_RATES:
1126 #ifdef CONFIG_LIBIPW_DEBUG
1127 p = rates_str;
1128 #endif
1129 network->rates_len = min(info_element->len,
1130 MAX_RATES_LENGTH);
1131 for (i = 0; i < network->rates_len; i++) {
1132 network->rates[i] = info_element->data[i];
1133 #ifdef CONFIG_LIBIPW_DEBUG
1134 p += scnprintf(p, sizeof(rates_str) -
1135 (p - rates_str), "%02X ",
1136 network->rates[i]);
1137 #endif
1138 if (libipw_is_ofdm_rate
1139 (info_element->data[i])) {
1140 network->flags |= NETWORK_HAS_OFDM;
1141 if (info_element->data[i] &
1142 LIBIPW_BASIC_RATE_MASK)
1143 network->flags &=
1144 ~NETWORK_HAS_CCK;
1145 }
1146 }
1147
1148 LIBIPW_DEBUG_MGMT("WLAN_EID_SUPP_RATES: '%s' (%d)\n",
1149 rates_str, network->rates_len);
1150 break;
1151
1152 case WLAN_EID_EXT_SUPP_RATES:
1153 #ifdef CONFIG_LIBIPW_DEBUG
1154 p = rates_str;
1155 #endif
1156 network->rates_ex_len = min(info_element->len,
1157 MAX_RATES_EX_LENGTH);
1158 for (i = 0; i < network->rates_ex_len; i++) {
1159 network->rates_ex[i] = info_element->data[i];
1160 #ifdef CONFIG_LIBIPW_DEBUG
1161 p += scnprintf(p, sizeof(rates_str) -
1162 (p - rates_str), "%02X ",
1163 network->rates_ex[i]);
1164 #endif
1165 if (libipw_is_ofdm_rate
1166 (info_element->data[i])) {
1167 network->flags |= NETWORK_HAS_OFDM;
1168 if (info_element->data[i] &
1169 LIBIPW_BASIC_RATE_MASK)
1170 network->flags &=
1171 ~NETWORK_HAS_CCK;
1172 }
1173 }
1174
1175 LIBIPW_DEBUG_MGMT("WLAN_EID_EXT_SUPP_RATES: '%s' (%d)\n",
1176 rates_str, network->rates_ex_len);
1177 break;
1178
1179 case WLAN_EID_DS_PARAMS:
1180 LIBIPW_DEBUG_MGMT("WLAN_EID_DS_PARAMS: %d\n",
1181 info_element->data[0]);
1182 network->channel = info_element->data[0];
1183 break;
1184
1185 case WLAN_EID_FH_PARAMS:
1186 LIBIPW_DEBUG_MGMT("WLAN_EID_FH_PARAMS: ignored\n");
1187 break;
1188
1189 case WLAN_EID_CF_PARAMS:
1190 LIBIPW_DEBUG_MGMT("WLAN_EID_CF_PARAMS: ignored\n");
1191 break;
1192
1193 case WLAN_EID_TIM:
1194 network->tim.tim_count = info_element->data[0];
1195 network->tim.tim_period = info_element->data[1];
1196 LIBIPW_DEBUG_MGMT("WLAN_EID_TIM: partially ignored\n");
1197 break;
1198
1199 case WLAN_EID_ERP_INFO:
1200 network->erp_value = info_element->data[0];
1201 network->flags |= NETWORK_HAS_ERP_VALUE;
1202 LIBIPW_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1203 network->erp_value);
1204 break;
1205
1206 case WLAN_EID_IBSS_PARAMS:
1207 network->atim_window = info_element->data[0];
1208 LIBIPW_DEBUG_MGMT("WLAN_EID_IBSS_PARAMS: %d\n",
1209 network->atim_window);
1210 break;
1211
1212 case WLAN_EID_CHALLENGE:
1213 LIBIPW_DEBUG_MGMT("WLAN_EID_CHALLENGE: ignored\n");
1214 break;
1215
1216 case WLAN_EID_VENDOR_SPECIFIC:
1217 LIBIPW_DEBUG_MGMT("WLAN_EID_VENDOR_SPECIFIC: %d bytes\n",
1218 info_element->len);
1219 if (!libipw_parse_qos_info_param_IE(info_element,
1220 network))
1221 break;
1222
1223 if (info_element->len >= 4 &&
1224 info_element->data[0] == 0x00 &&
1225 info_element->data[1] == 0x50 &&
1226 info_element->data[2] == 0xf2 &&
1227 info_element->data[3] == 0x01) {
1228 network->wpa_ie_len = min(info_element->len + 2,
1229 MAX_WPA_IE_LEN);
1230 memcpy(network->wpa_ie, info_element,
1231 network->wpa_ie_len);
1232 }
1233 break;
1234
1235 case WLAN_EID_RSN:
1236 LIBIPW_DEBUG_MGMT("WLAN_EID_RSN: %d bytes\n",
1237 info_element->len);
1238 network->rsn_ie_len = min(info_element->len + 2,
1239 MAX_WPA_IE_LEN);
1240 memcpy(network->rsn_ie, info_element,
1241 network->rsn_ie_len);
1242 break;
1243
1244 case WLAN_EID_QOS_PARAMETER:
1245 printk(KERN_ERR
1246 "QoS Error need to parse QOS_PARAMETER IE\n");
1247 break;
1248 /* 802.11h */
1249 case WLAN_EID_PWR_CONSTRAINT:
1250 network->power_constraint = info_element->data[0];
1251 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1252 break;
1253
1254 case WLAN_EID_CHANNEL_SWITCH:
1255 network->power_constraint = info_element->data[0];
1256 network->flags |= NETWORK_HAS_CSA;
1257 break;
1258
1259 case WLAN_EID_QUIET:
1260 network->quiet.count = info_element->data[0];
1261 network->quiet.period = info_element->data[1];
1262 network->quiet.duration = info_element->data[2];
1263 network->quiet.offset = info_element->data[3];
1264 network->flags |= NETWORK_HAS_QUIET;
1265 break;
1266
1267 case WLAN_EID_IBSS_DFS:
1268 network->flags |= NETWORK_HAS_IBSS_DFS;
1269 break;
1270
1271 case WLAN_EID_TPC_REPORT:
1272 network->tpc_report.transmit_power =
1273 info_element->data[0];
1274 network->tpc_report.link_margin = info_element->data[1];
1275 network->flags |= NETWORK_HAS_TPC_REPORT;
1276 break;
1277
1278 default:
1279 LIBIPW_DEBUG_MGMT
1280 ("Unsupported info element: %s (%d)\n",
1281 get_info_element_string(info_element->id),
1282 info_element->id);
1283 break;
1284 }
1285
1286 length -= sizeof(*info_element) + info_element->len;
1287 info_element =
1288 (struct libipw_info_element *)&info_element->
1289 data[info_element->len];
1290 }
1291
1292 return 0;
1293 }
1294
1295 static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response
1296 *frame, struct libipw_rx_stats *stats)
1297 {
1298 struct libipw_network network_resp = { };
1299 struct libipw_network *network = &network_resp;
1300 struct net_device *dev = ieee->dev;
1301
1302 network->flags = 0;
1303 network->qos_data.active = 0;
1304 network->qos_data.supported = 0;
1305 network->qos_data.param_count = 0;
1306 network->qos_data.old_param_count = 0;
1307
1308 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1309 network->atim_window = le16_to_cpu(frame->aid);
1310 network->listen_interval = le16_to_cpu(frame->status);
1311 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1312 network->capability = le16_to_cpu(frame->capability);
1313 network->last_scanned = jiffies;
1314 network->rates_len = network->rates_ex_len = 0;
1315 network->last_associate = 0;
1316 network->ssid_len = 0;
1317 network->erp_value =
1318 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1319
1320 if (stats->freq == LIBIPW_52GHZ_BAND) {
1321 /* for A band (No DS info) */
1322 network->channel = stats->received_channel;
1323 } else
1324 network->flags |= NETWORK_HAS_CCK;
1325
1326 network->wpa_ie_len = 0;
1327 network->rsn_ie_len = 0;
1328
1329 if (libipw_parse_info_param((void *)frame->variable,
1330 stats->len - sizeof(*frame), network))
1331 return 1;
1332
1333 network->mode = 0;
1334 if (stats->freq == LIBIPW_52GHZ_BAND)
1335 network->mode = IEEE_A;
1336 else {
1337 if (network->flags & NETWORK_HAS_OFDM)
1338 network->mode |= IEEE_G;
1339 if (network->flags & NETWORK_HAS_CCK)
1340 network->mode |= IEEE_B;
1341 }
1342
1343 memcpy(&network->stats, stats, sizeof(network->stats));
1344
1345 if (ieee->handle_assoc_response != NULL)
1346 ieee->handle_assoc_response(dev, frame, network);
1347
1348 return 0;
1349 }
1350
1351 /***************************************************/
1352
1353 static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_response
1354 *beacon,
1355 struct libipw_network *network,
1356 struct libipw_rx_stats *stats)
1357 {
1358 network->qos_data.active = 0;
1359 network->qos_data.supported = 0;
1360 network->qos_data.param_count = 0;
1361 network->qos_data.old_param_count = 0;
1362
1363 /* Pull out fixed field data */
1364 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1365 network->capability = le16_to_cpu(beacon->capability);
1366 network->last_scanned = jiffies;
1367 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1368 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1369 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1370 /* Where to pull this? beacon->listen_interval; */
1371 network->listen_interval = 0x0A;
1372 network->rates_len = network->rates_ex_len = 0;
1373 network->last_associate = 0;
1374 network->ssid_len = 0;
1375 network->flags = 0;
1376 network->atim_window = 0;
1377 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1378 0x3 : 0x0;
1379
1380 if (stats->freq == LIBIPW_52GHZ_BAND) {
1381 /* for A band (No DS info) */
1382 network->channel = stats->received_channel;
1383 } else
1384 network->flags |= NETWORK_HAS_CCK;
1385
1386 network->wpa_ie_len = 0;
1387 network->rsn_ie_len = 0;
1388
1389 if (libipw_parse_info_param((void *)beacon->variable,
1390 stats->len - sizeof(*beacon), network))
1391 return 1;
1392
1393 network->mode = 0;
1394 if (stats->freq == LIBIPW_52GHZ_BAND)
1395 network->mode = IEEE_A;
1396 else {
1397 if (network->flags & NETWORK_HAS_OFDM)
1398 network->mode |= IEEE_G;
1399 if (network->flags & NETWORK_HAS_CCK)
1400 network->mode |= IEEE_B;
1401 }
1402
1403 if (network->mode == 0) {
1404 LIBIPW_DEBUG_SCAN("Filtered out '%*pE (%pM)' network.\n",
1405 network->ssid_len, network->ssid,
1406 network->bssid);
1407 return 1;
1408 }
1409
1410 memcpy(&network->stats, stats, sizeof(network->stats));
1411
1412 return 0;
1413 }
1414
1415 static inline int is_same_network(struct libipw_network *src,
1416 struct libipw_network *dst)
1417 {
1418 /* A network is only a duplicate if the channel, BSSID, and ESSID
1419 * all match. We treat all <hidden> with the same BSSID and channel
1420 * as one network */
1421 return ((src->ssid_len == dst->ssid_len) &&
1422 (src->channel == dst->channel) &&
1423 ether_addr_equal_64bits(src->bssid, dst->bssid) &&
1424 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1425 }
1426
1427 static void update_network(struct libipw_network *dst,
1428 struct libipw_network *src)
1429 {
1430 int qos_active;
1431 u8 old_param;
1432
1433 /* We only update the statistics if they were created by receiving
1434 * the network information on the actual channel the network is on.
1435 *
1436 * This keeps beacons received on neighbor channels from bringing
1437 * down the signal level of an AP. */
1438 if (dst->channel == src->stats.received_channel)
1439 memcpy(&dst->stats, &src->stats,
1440 sizeof(struct libipw_rx_stats));
1441 else
1442 LIBIPW_DEBUG_SCAN("Network %pM info received "
1443 "off channel (%d vs. %d)\n", src->bssid,
1444 dst->channel, src->stats.received_channel);
1445
1446 dst->capability = src->capability;
1447 memcpy(dst->rates, src->rates, src->rates_len);
1448 dst->rates_len = src->rates_len;
1449 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1450 dst->rates_ex_len = src->rates_ex_len;
1451
1452 dst->mode = src->mode;
1453 dst->flags = src->flags;
1454 dst->time_stamp[0] = src->time_stamp[0];
1455 dst->time_stamp[1] = src->time_stamp[1];
1456
1457 dst->beacon_interval = src->beacon_interval;
1458 dst->listen_interval = src->listen_interval;
1459 dst->atim_window = src->atim_window;
1460 dst->erp_value = src->erp_value;
1461 dst->tim = src->tim;
1462
1463 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1464 dst->wpa_ie_len = src->wpa_ie_len;
1465 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1466 dst->rsn_ie_len = src->rsn_ie_len;
1467
1468 dst->last_scanned = jiffies;
1469 qos_active = src->qos_data.active;
1470 old_param = dst->qos_data.old_param_count;
1471 if (dst->flags & NETWORK_HAS_QOS_MASK)
1472 memcpy(&dst->qos_data, &src->qos_data,
1473 sizeof(struct libipw_qos_data));
1474 else {
1475 dst->qos_data.supported = src->qos_data.supported;
1476 dst->qos_data.param_count = src->qos_data.param_count;
1477 }
1478
1479 if (dst->qos_data.supported == 1) {
1480 if (dst->ssid_len)
1481 LIBIPW_DEBUG_QOS
1482 ("QoS the network %s is QoS supported\n",
1483 dst->ssid);
1484 else
1485 LIBIPW_DEBUG_QOS
1486 ("QoS the network is QoS supported\n");
1487 }
1488 dst->qos_data.active = qos_active;
1489 dst->qos_data.old_param_count = old_param;
1490
1491 /* dst->last_associate is not overwritten */
1492 }
1493
1494 static inline int is_beacon(__le16 fc)
1495 {
1496 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1497 }
1498
1499 static void libipw_process_probe_response(struct libipw_device
1500 *ieee, struct
1501 libipw_probe_response
1502 *beacon, struct libipw_rx_stats
1503 *stats)
1504 {
1505 struct net_device *dev = ieee->dev;
1506 struct libipw_network network = { };
1507 struct libipw_network *target;
1508 struct libipw_network *oldest = NULL;
1509 #ifdef CONFIG_LIBIPW_DEBUG
1510 struct libipw_info_element *info_element = (void *)beacon->variable;
1511 #endif
1512 unsigned long flags;
1513
1514 LIBIPW_DEBUG_SCAN("'%*pE' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1515 info_element->len, info_element->data,
1516 beacon->header.addr3,
1517 (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0',
1518 (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0',
1519 (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0',
1520 (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0',
1521 (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0',
1522 (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0',
1523 (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0',
1524 (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0',
1525 (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0',
1526 (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0',
1527 (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0',
1528 (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0',
1529 (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0',
1530 (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0',
1531 (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0',
1532 (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0');
1533
1534 if (libipw_network_init(ieee, beacon, &network, stats)) {
1535 LIBIPW_DEBUG_SCAN("Dropped '%*pE' (%pM) via %s.\n",
1536 info_element->len, info_element->data,
1537 beacon->header.addr3,
1538 is_beacon(beacon->header.frame_ctl) ?
1539 "BEACON" : "PROBE RESPONSE");
1540 return;
1541 }
1542
1543 /* The network parsed correctly -- so now we scan our known networks
1544 * to see if we can find it in our list.
1545 *
1546 * NOTE: This search is definitely not optimized. Once its doing
1547 * the "right thing" we'll optimize it for efficiency if
1548 * necessary */
1549
1550 /* Search for this entry in the list and update it if it is
1551 * already there. */
1552
1553 spin_lock_irqsave(&ieee->lock, flags);
1554
1555 list_for_each_entry(target, &ieee->network_list, list) {
1556 if (is_same_network(target, &network))
1557 break;
1558
1559 if ((oldest == NULL) ||
1560 time_before(target->last_scanned, oldest->last_scanned))
1561 oldest = target;
1562 }
1563
1564 /* If we didn't find a match, then get a new network slot to initialize
1565 * with this beacon's information */
1566 if (&target->list == &ieee->network_list) {
1567 if (list_empty(&ieee->network_free_list)) {
1568 /* If there are no more slots, expire the oldest */
1569 list_del(&oldest->list);
1570 target = oldest;
1571 LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n",
1572 target->ssid_len, target->ssid,
1573 target->bssid);
1574 } else {
1575 /* Otherwise just pull from the free list */
1576 target = list_entry(ieee->network_free_list.next,
1577 struct libipw_network, list);
1578 list_del(ieee->network_free_list.next);
1579 }
1580
1581 #ifdef CONFIG_LIBIPW_DEBUG
1582 LIBIPW_DEBUG_SCAN("Adding '%*pE' (%pM) via %s.\n",
1583 network.ssid_len, network.ssid,
1584 network.bssid,
1585 is_beacon(beacon->header.frame_ctl) ?
1586 "BEACON" : "PROBE RESPONSE");
1587 #endif
1588 memcpy(target, &network, sizeof(*target));
1589 list_add_tail(&target->list, &ieee->network_list);
1590 } else {
1591 LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n",
1592 target->ssid_len, target->ssid,
1593 target->bssid,
1594 is_beacon(beacon->header.frame_ctl) ?
1595 "BEACON" : "PROBE RESPONSE");
1596 update_network(target, &network);
1597 }
1598
1599 spin_unlock_irqrestore(&ieee->lock, flags);
1600
1601 if (is_beacon(beacon->header.frame_ctl)) {
1602 if (ieee->handle_beacon != NULL)
1603 ieee->handle_beacon(dev, beacon, target);
1604 } else {
1605 if (ieee->handle_probe_response != NULL)
1606 ieee->handle_probe_response(dev, beacon, target);
1607 }
1608 }
1609
1610 void libipw_rx_mgt(struct libipw_device *ieee,
1611 struct libipw_hdr_4addr *header,
1612 struct libipw_rx_stats *stats)
1613 {
1614 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1615 case IEEE80211_STYPE_ASSOC_RESP:
1616 LIBIPW_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1617 WLAN_FC_GET_STYPE(le16_to_cpu
1618 (header->frame_ctl)));
1619 libipw_handle_assoc_resp(ieee,
1620 (struct libipw_assoc_response *)
1621 header, stats);
1622 break;
1623
1624 case IEEE80211_STYPE_REASSOC_RESP:
1625 LIBIPW_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1626 WLAN_FC_GET_STYPE(le16_to_cpu
1627 (header->frame_ctl)));
1628 break;
1629
1630 case IEEE80211_STYPE_PROBE_REQ:
1631 LIBIPW_DEBUG_MGMT("received auth (%d)\n",
1632 WLAN_FC_GET_STYPE(le16_to_cpu
1633 (header->frame_ctl)));
1634
1635 if (ieee->handle_probe_request != NULL)
1636 ieee->handle_probe_request(ieee->dev,
1637 (struct
1638 libipw_probe_request *)
1639 header, stats);
1640 break;
1641
1642 case IEEE80211_STYPE_PROBE_RESP:
1643 LIBIPW_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1644 WLAN_FC_GET_STYPE(le16_to_cpu
1645 (header->frame_ctl)));
1646 LIBIPW_DEBUG_SCAN("Probe response\n");
1647 libipw_process_probe_response(ieee,
1648 (struct
1649 libipw_probe_response *)
1650 header, stats);
1651 break;
1652
1653 case IEEE80211_STYPE_BEACON:
1654 LIBIPW_DEBUG_MGMT("received BEACON (%d)\n",
1655 WLAN_FC_GET_STYPE(le16_to_cpu
1656 (header->frame_ctl)));
1657 LIBIPW_DEBUG_SCAN("Beacon\n");
1658 libipw_process_probe_response(ieee,
1659 (struct
1660 libipw_probe_response *)
1661 header, stats);
1662 break;
1663 case IEEE80211_STYPE_AUTH:
1664
1665 LIBIPW_DEBUG_MGMT("received auth (%d)\n",
1666 WLAN_FC_GET_STYPE(le16_to_cpu
1667 (header->frame_ctl)));
1668
1669 if (ieee->handle_auth != NULL)
1670 ieee->handle_auth(ieee->dev,
1671 (struct libipw_auth *)header);
1672 break;
1673
1674 case IEEE80211_STYPE_DISASSOC:
1675 if (ieee->handle_disassoc != NULL)
1676 ieee->handle_disassoc(ieee->dev,
1677 (struct libipw_disassoc *)
1678 header);
1679 break;
1680
1681 case IEEE80211_STYPE_ACTION:
1682 LIBIPW_DEBUG_MGMT("ACTION\n");
1683 if (ieee->handle_action)
1684 ieee->handle_action(ieee->dev,
1685 (struct libipw_action *)
1686 header, stats);
1687 break;
1688
1689 case IEEE80211_STYPE_REASSOC_REQ:
1690 LIBIPW_DEBUG_MGMT("received reassoc (%d)\n",
1691 WLAN_FC_GET_STYPE(le16_to_cpu
1692 (header->frame_ctl)));
1693
1694 LIBIPW_DEBUG_MGMT("%s: LIBIPW_REASSOC_REQ received\n",
1695 ieee->dev->name);
1696 if (ieee->handle_reassoc_request != NULL)
1697 ieee->handle_reassoc_request(ieee->dev,
1698 (struct libipw_reassoc_request *)
1699 header);
1700 break;
1701
1702 case IEEE80211_STYPE_ASSOC_REQ:
1703 LIBIPW_DEBUG_MGMT("received assoc (%d)\n",
1704 WLAN_FC_GET_STYPE(le16_to_cpu
1705 (header->frame_ctl)));
1706
1707 LIBIPW_DEBUG_MGMT("%s: LIBIPW_ASSOC_REQ received\n",
1708 ieee->dev->name);
1709 if (ieee->handle_assoc_request != NULL)
1710 ieee->handle_assoc_request(ieee->dev);
1711 break;
1712
1713 case IEEE80211_STYPE_DEAUTH:
1714 LIBIPW_DEBUG_MGMT("DEAUTH\n");
1715 if (ieee->handle_deauth != NULL)
1716 ieee->handle_deauth(ieee->dev,
1717 (struct libipw_deauth *)
1718 header);
1719 break;
1720 default:
1721 LIBIPW_DEBUG_MGMT("received UNKNOWN (%d)\n",
1722 WLAN_FC_GET_STYPE(le16_to_cpu
1723 (header->frame_ctl)));
1724 LIBIPW_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1725 ieee->dev->name,
1726 WLAN_FC_GET_STYPE(le16_to_cpu
1727 (header->frame_ctl)));
1728 break;
1729 }
1730 }
1731
1732 EXPORT_SYMBOL_GPL(libipw_rx_any);
1733 EXPORT_SYMBOL(libipw_rx_mgt);
1734 EXPORT_SYMBOL(libipw_rx);
Kernel DRM miscellaneous fixes and cross-tree changes