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
31 #include <net/lib80211.h>
32
33 #include "libipw.h"
34
libipw_monitor_rx(struct libipw_device * ieee,struct sk_buff * skb,struct libipw_rx_stats * rx_stats)35 static void libipw_monitor_rx(struct libipw_device *ieee,
36 struct sk_buff *skb,
37 struct libipw_rx_stats *rx_stats)
38 {
39 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
40 u16 fc = le16_to_cpu(hdr->frame_control);
41
42 skb->dev = ieee->dev;
43 skb_reset_mac_header(skb);
44 skb_pull(skb, libipw_get_hdrlen(fc));
45 skb->pkt_type = PACKET_OTHERHOST;
46 skb->protocol = htons(ETH_P_80211_RAW);
47 memset(skb->cb, 0, sizeof(skb->cb));
48 netif_rx(skb);
49 }
50
51 /* Called only as a tasklet (software IRQ) */
libipw_frag_cache_find(struct libipw_device * ieee,unsigned int seq,unsigned int frag,u8 * src,u8 * dst)52 static struct libipw_frag_entry *libipw_frag_cache_find(struct
53 libipw_device
54 *ieee,
55 unsigned int seq,
56 unsigned int frag,
57 u8 * src,
58 u8 * dst)
59 {
60 struct libipw_frag_entry *entry;
61 int i;
62
63 for (i = 0; i < LIBIPW_FRAG_CACHE_LEN; i++) {
64 entry = &ieee->frag_cache[i];
65 if (entry->skb != NULL &&
66 time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
67 LIBIPW_DEBUG_FRAG("expiring fragment cache entry "
68 "seq=%u last_frag=%u\n",
69 entry->seq, entry->last_frag);
70 dev_kfree_skb_any(entry->skb);
71 entry->skb = NULL;
72 }
73
74 if (entry->skb != NULL && entry->seq == seq &&
75 (entry->last_frag + 1 == frag || frag == -1) &&
76 ether_addr_equal(entry->src_addr, src) &&
77 ether_addr_equal(entry->dst_addr, dst))
78 return entry;
79 }
80
81 return NULL;
82 }
83
84 /* Called only as a tasklet (software IRQ) */
libipw_frag_cache_get(struct libipw_device * ieee,struct libipw_hdr_4addr * hdr)85 static struct sk_buff *libipw_frag_cache_get(struct libipw_device *ieee,
86 struct libipw_hdr_4addr *hdr)
87 {
88 struct sk_buff *skb = NULL;
89 u16 sc;
90 unsigned int frag, seq;
91 struct libipw_frag_entry *entry;
92
93 sc = le16_to_cpu(hdr->seq_ctl);
94 frag = WLAN_GET_SEQ_FRAG(sc);
95 seq = WLAN_GET_SEQ_SEQ(sc);
96
97 if (frag == 0) {
98 /* Reserve enough space to fit maximum frame length */
99 skb = dev_alloc_skb(ieee->dev->mtu +
100 sizeof(struct libipw_hdr_4addr) +
101 8 /* LLC */ +
102 2 /* alignment */ +
103 8 /* WEP */ + ETH_ALEN /* WDS */ );
104 if (skb == NULL)
105 return NULL;
106
107 entry = &ieee->frag_cache[ieee->frag_next_idx];
108 ieee->frag_next_idx++;
109 if (ieee->frag_next_idx >= LIBIPW_FRAG_CACHE_LEN)
110 ieee->frag_next_idx = 0;
111
112 if (entry->skb != NULL)
113 dev_kfree_skb_any(entry->skb);
114
115 entry->first_frag_time = jiffies;
116 entry->seq = seq;
117 entry->last_frag = frag;
118 entry->skb = skb;
119 memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
120 memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
121 } else {
122 /* received a fragment of a frame for which the head fragment
123 * should have already been received */
124 entry = libipw_frag_cache_find(ieee, seq, frag, hdr->addr2,
125 hdr->addr1);
126 if (entry != NULL) {
127 entry->last_frag = frag;
128 skb = entry->skb;
129 }
130 }
131
132 return skb;
133 }
134
135 /* Called only as a tasklet (software IRQ) */
libipw_frag_cache_invalidate(struct libipw_device * ieee,struct libipw_hdr_4addr * hdr)136 static int libipw_frag_cache_invalidate(struct libipw_device *ieee,
137 struct libipw_hdr_4addr *hdr)
138 {
139 u16 sc;
140 unsigned int seq;
141 struct libipw_frag_entry *entry;
142
143 sc = le16_to_cpu(hdr->seq_ctl);
144 seq = WLAN_GET_SEQ_SEQ(sc);
145
146 entry = libipw_frag_cache_find(ieee, seq, -1, hdr->addr2,
147 hdr->addr1);
148
149 if (entry == NULL) {
150 LIBIPW_DEBUG_FRAG("could not invalidate fragment cache "
151 "entry (seq=%u)\n", seq);
152 return -1;
153 }
154
155 entry->skb = NULL;
156 return 0;
157 }
158
159 #ifdef NOT_YET
160 /* libipw_rx_frame_mgtmt
161 *
162 * Responsible for handling management control frames
163 *
164 * Called by libipw_rx */
165 static int
libipw_rx_frame_mgmt(struct libipw_device * ieee,struct sk_buff * skb,struct libipw_rx_stats * rx_stats,u16 type,u16 stype)166 libipw_rx_frame_mgmt(struct libipw_device *ieee, struct sk_buff *skb,
167 struct libipw_rx_stats *rx_stats, u16 type,
168 u16 stype)
169 {
170 if (ieee->iw_mode == IW_MODE_MASTER) {
171 printk(KERN_DEBUG "%s: Master mode not yet supported.\n",
172 ieee->dev->name);
173 return 0;
174 /*
175 hostap_update_sta_ps(ieee, (struct hostap_libipw_hdr_4addr *)
176 skb->data);*/
177 }
178
179 if (ieee->hostapd && type == WLAN_FC_TYPE_MGMT) {
180 if (stype == WLAN_FC_STYPE_BEACON &&
181 ieee->iw_mode == IW_MODE_MASTER) {
182 struct sk_buff *skb2;
183 /* Process beacon frames also in kernel driver to
184 * update STA(AP) table statistics */
185 skb2 = skb_clone(skb, GFP_ATOMIC);
186 if (skb2)
187 hostap_rx(skb2->dev, skb2, rx_stats);
188 }
189
190 /* send management frames to the user space daemon for
191 * processing */
192 ieee->apdevstats.rx_packets++;
193 ieee->apdevstats.rx_bytes += skb->len;
194 prism2_rx_80211(ieee->apdev, skb, rx_stats, PRISM2_RX_MGMT);
195 return 0;
196 }
197
198 if (ieee->iw_mode == IW_MODE_MASTER) {
199 if (type != WLAN_FC_TYPE_MGMT && type != WLAN_FC_TYPE_CTRL) {
200 printk(KERN_DEBUG "%s: unknown management frame "
201 "(type=0x%02x, stype=0x%02x) dropped\n",
202 skb->dev->name, type, stype);
203 return -1;
204 }
205
206 hostap_rx(skb->dev, skb, rx_stats);
207 return 0;
208 }
209
210 printk(KERN_DEBUG "%s: hostap_rx_frame_mgmt: management frame "
211 "received in non-Host AP mode\n", skb->dev->name);
212 return -1;
213 }
214 #endif
215
216 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
217 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
218 static unsigned char libipw_rfc1042_header[] =
219 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
220
221 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
222 static unsigned char libipw_bridge_tunnel_header[] =
223 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
224 /* No encapsulation header if EtherType < 0x600 (=length) */
225
226 /* Called by libipw_rx_frame_decrypt */
libipw_is_eapol_frame(struct libipw_device * ieee,struct sk_buff * skb)227 static int libipw_is_eapol_frame(struct libipw_device *ieee,
228 struct sk_buff *skb)
229 {
230 struct net_device *dev = ieee->dev;
231 u16 fc, ethertype;
232 struct libipw_hdr_3addr *hdr;
233 u8 *pos;
234
235 if (skb->len < 24)
236 return 0;
237
238 hdr = (struct libipw_hdr_3addr *)skb->data;
239 fc = le16_to_cpu(hdr->frame_ctl);
240
241 /* check that the frame is unicast frame to us */
242 if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
243 IEEE80211_FCTL_TODS &&
244 ether_addr_equal(hdr->addr1, dev->dev_addr) &&
245 ether_addr_equal(hdr->addr3, dev->dev_addr)) {
246 /* ToDS frame with own addr BSSID and DA */
247 } else if ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
248 IEEE80211_FCTL_FROMDS &&
249 ether_addr_equal(hdr->addr1, dev->dev_addr)) {
250 /* FromDS frame with own addr as DA */
251 } else
252 return 0;
253
254 if (skb->len < 24 + 8)
255 return 0;
256
257 /* check for port access entity Ethernet type */
258 pos = skb->data + 24;
259 ethertype = (pos[6] << 8) | pos[7];
260 if (ethertype == ETH_P_PAE)
261 return 1;
262
263 return 0;
264 }
265
266 /* Called only as a tasklet (software IRQ), by libipw_rx */
267 static int
libipw_rx_frame_decrypt(struct libipw_device * ieee,struct sk_buff * skb,struct lib80211_crypt_data * crypt)268 libipw_rx_frame_decrypt(struct libipw_device *ieee, struct sk_buff *skb,
269 struct lib80211_crypt_data *crypt)
270 {
271 struct libipw_hdr_3addr *hdr;
272 int res, hdrlen;
273
274 if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
275 return 0;
276
277 hdr = (struct libipw_hdr_3addr *)skb->data;
278 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
279
280 atomic_inc(&crypt->refcnt);
281 res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
282 atomic_dec(&crypt->refcnt);
283 if (res < 0) {
284 LIBIPW_DEBUG_DROP("decryption failed (SA=%pM) res=%d\n",
285 hdr->addr2, res);
286 if (res == -2)
287 LIBIPW_DEBUG_DROP("Decryption failed ICV "
288 "mismatch (key %d)\n",
289 skb->data[hdrlen + 3] >> 6);
290 ieee->ieee_stats.rx_discards_undecryptable++;
291 return -1;
292 }
293
294 return res;
295 }
296
297 /* Called only as a tasklet (software IRQ), by libipw_rx */
298 static int
libipw_rx_frame_decrypt_msdu(struct libipw_device * ieee,struct sk_buff * skb,int keyidx,struct lib80211_crypt_data * crypt)299 libipw_rx_frame_decrypt_msdu(struct libipw_device *ieee,
300 struct sk_buff *skb, int keyidx,
301 struct lib80211_crypt_data *crypt)
302 {
303 struct libipw_hdr_3addr *hdr;
304 int res, hdrlen;
305
306 if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
307 return 0;
308
309 hdr = (struct libipw_hdr_3addr *)skb->data;
310 hdrlen = libipw_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
311
312 atomic_inc(&crypt->refcnt);
313 res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
314 atomic_dec(&crypt->refcnt);
315 if (res < 0) {
316 printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
317 " (SA=%pM keyidx=%d)\n", ieee->dev->name, hdr->addr2,
318 keyidx);
319 return -1;
320 }
321
322 return 0;
323 }
324
325 /* All received frames are sent to this function. @skb contains the frame in
326 * IEEE 802.11 format, i.e., in the format it was sent over air.
327 * This function is called only as a tasklet (software IRQ). */
libipw_rx(struct libipw_device * ieee,struct sk_buff * skb,struct libipw_rx_stats * rx_stats)328 int libipw_rx(struct libipw_device *ieee, struct sk_buff *skb,
329 struct libipw_rx_stats *rx_stats)
330 {
331 struct net_device *dev = ieee->dev;
332 struct libipw_hdr_4addr *hdr;
333 size_t hdrlen;
334 u16 fc, type, stype, sc;
335 unsigned int frag;
336 u8 *payload;
337 u16 ethertype;
338 #ifdef NOT_YET
339 struct net_device *wds = NULL;
340 struct sk_buff *skb2 = NULL;
341 struct net_device *wds = NULL;
342 int frame_authorized = 0;
343 int from_assoc_ap = 0;
344 void *sta = NULL;
345 #endif
346 u8 dst[ETH_ALEN];
347 u8 src[ETH_ALEN];
348 struct lib80211_crypt_data *crypt = NULL;
349 int keyidx = 0;
350 int can_be_decrypted = 0;
351
352 hdr = (struct libipw_hdr_4addr *)skb->data;
353 if (skb->len < 10) {
354 printk(KERN_INFO "%s: SKB length < 10\n", dev->name);
355 goto rx_dropped;
356 }
357
358 fc = le16_to_cpu(hdr->frame_ctl);
359 type = WLAN_FC_GET_TYPE(fc);
360 stype = WLAN_FC_GET_STYPE(fc);
361 sc = le16_to_cpu(hdr->seq_ctl);
362 frag = WLAN_GET_SEQ_FRAG(sc);
363 hdrlen = libipw_get_hdrlen(fc);
364
365 if (skb->len < hdrlen) {
366 printk(KERN_INFO "%s: invalid SKB length %d\n",
367 dev->name, skb->len);
368 goto rx_dropped;
369 }
370
371 /* Put this code here so that we avoid duplicating it in all
372 * Rx paths. - Jean II */
373 #ifdef CONFIG_WIRELESS_EXT
374 #ifdef IW_WIRELESS_SPY /* defined in iw_handler.h */
375 /* If spy monitoring on */
376 if (ieee->spy_data.spy_number > 0) {
377 struct iw_quality wstats;
378
379 wstats.updated = 0;
380 if (rx_stats->mask & LIBIPW_STATMASK_RSSI) {
381 wstats.level = rx_stats->signal;
382 wstats.updated |= IW_QUAL_LEVEL_UPDATED;
383 } else
384 wstats.updated |= IW_QUAL_LEVEL_INVALID;
385
386 if (rx_stats->mask & LIBIPW_STATMASK_NOISE) {
387 wstats.noise = rx_stats->noise;
388 wstats.updated |= IW_QUAL_NOISE_UPDATED;
389 } else
390 wstats.updated |= IW_QUAL_NOISE_INVALID;
391
392 if (rx_stats->mask & LIBIPW_STATMASK_SIGNAL) {
393 wstats.qual = rx_stats->signal;
394 wstats.updated |= IW_QUAL_QUAL_UPDATED;
395 } else
396 wstats.updated |= IW_QUAL_QUAL_INVALID;
397
398 /* Update spy records */
399 wireless_spy_update(ieee->dev, hdr->addr2, &wstats);
400 }
401 #endif /* IW_WIRELESS_SPY */
402 #endif /* CONFIG_WIRELESS_EXT */
403
404 #ifdef NOT_YET
405 hostap_update_rx_stats(local->ap, hdr, rx_stats);
406 #endif
407
408 if (ieee->iw_mode == IW_MODE_MONITOR) {
409 dev->stats.rx_packets++;
410 dev->stats.rx_bytes += skb->len;
411 libipw_monitor_rx(ieee, skb, rx_stats);
412 return 1;
413 }
414
415 can_be_decrypted = (is_multicast_ether_addr(hdr->addr1) ||
416 is_broadcast_ether_addr(hdr->addr2)) ?
417 ieee->host_mc_decrypt : ieee->host_decrypt;
418
419 if (can_be_decrypted) {
420 if (skb->len >= hdrlen + 3) {
421 /* Top two-bits of byte 3 are the key index */
422 keyidx = skb->data[hdrlen + 3] >> 6;
423 }
424
425 /* ieee->crypt[] is WEP_KEY (4) in length. Given that keyidx
426 * is only allowed 2-bits of storage, no value of keyidx can
427 * be provided via above code that would result in keyidx
428 * being out of range */
429 crypt = ieee->crypt_info.crypt[keyidx];
430
431 #ifdef NOT_YET
432 sta = NULL;
433
434 /* Use station specific key to override default keys if the
435 * receiver address is a unicast address ("individual RA"). If
436 * bcrx_sta_key parameter is set, station specific key is used
437 * even with broad/multicast targets (this is against IEEE
438 * 802.11, but makes it easier to use different keys with
439 * stations that do not support WEP key mapping). */
440
441 if (is_unicast_ether_addr(hdr->addr1) || local->bcrx_sta_key)
442 (void)hostap_handle_sta_crypto(local, hdr, &crypt,
443 &sta);
444 #endif
445
446 /* allow NULL decrypt to indicate an station specific override
447 * for default encryption */
448 if (crypt && (crypt->ops == NULL ||
449 crypt->ops->decrypt_mpdu == NULL))
450 crypt = NULL;
451
452 if (!crypt && (fc & IEEE80211_FCTL_PROTECTED)) {
453 /* This seems to be triggered by some (multicast?)
454 * frames from other than current BSS, so just drop the
455 * frames silently instead of filling system log with
456 * these reports. */
457 LIBIPW_DEBUG_DROP("Decryption failed (not set)"
458 " (SA=%pM)\n", hdr->addr2);
459 ieee->ieee_stats.rx_discards_undecryptable++;
460 goto rx_dropped;
461 }
462 }
463 #ifdef NOT_YET
464 if (type != WLAN_FC_TYPE_DATA) {
465 if (type == WLAN_FC_TYPE_MGMT && stype == WLAN_FC_STYPE_AUTH &&
466 fc & IEEE80211_FCTL_PROTECTED && ieee->host_decrypt &&
467 (keyidx = hostap_rx_frame_decrypt(ieee, skb, crypt)) < 0) {
468 printk(KERN_DEBUG "%s: failed to decrypt mgmt::auth "
469 "from %pM\n", dev->name, hdr->addr2);
470 /* TODO: could inform hostapd about this so that it
471 * could send auth failure report */
472 goto rx_dropped;
473 }
474
475 if (libipw_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
476 goto rx_dropped;
477 else
478 goto rx_exit;
479 }
480 #endif
481 /* drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.29) */
482 if (sc == ieee->prev_seq_ctl)
483 goto rx_dropped;
484 else
485 ieee->prev_seq_ctl = sc;
486
487 /* Data frame - extract src/dst addresses */
488 if (skb->len < LIBIPW_3ADDR_LEN)
489 goto rx_dropped;
490
491 switch (fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
492 case IEEE80211_FCTL_FROMDS:
493 memcpy(dst, hdr->addr1, ETH_ALEN);
494 memcpy(src, hdr->addr3, ETH_ALEN);
495 break;
496 case IEEE80211_FCTL_TODS:
497 memcpy(dst, hdr->addr3, ETH_ALEN);
498 memcpy(src, hdr->addr2, ETH_ALEN);
499 break;
500 case IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS:
501 if (skb->len < LIBIPW_4ADDR_LEN)
502 goto rx_dropped;
503 memcpy(dst, hdr->addr3, ETH_ALEN);
504 memcpy(src, hdr->addr4, ETH_ALEN);
505 break;
506 default:
507 memcpy(dst, hdr->addr1, ETH_ALEN);
508 memcpy(src, hdr->addr2, ETH_ALEN);
509 break;
510 }
511
512 #ifdef NOT_YET
513 if (hostap_rx_frame_wds(ieee, hdr, fc, &wds))
514 goto rx_dropped;
515 if (wds) {
516 skb->dev = dev = wds;
517 stats = hostap_get_stats(dev);
518 }
519
520 if (ieee->iw_mode == IW_MODE_MASTER && !wds &&
521 (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
522 IEEE80211_FCTL_FROMDS && ieee->stadev &&
523 ether_addr_equal(hdr->addr2, ieee->assoc_ap_addr)) {
524 /* Frame from BSSID of the AP for which we are a client */
525 skb->dev = dev = ieee->stadev;
526 stats = hostap_get_stats(dev);
527 from_assoc_ap = 1;
528 }
529 #endif
530
531 #ifdef NOT_YET
532 if ((ieee->iw_mode == IW_MODE_MASTER ||
533 ieee->iw_mode == IW_MODE_REPEAT) && !from_assoc_ap) {
534 switch (hostap_handle_sta_rx(ieee, dev, skb, rx_stats,
535 wds != NULL)) {
536 case AP_RX_CONTINUE_NOT_AUTHORIZED:
537 frame_authorized = 0;
538 break;
539 case AP_RX_CONTINUE:
540 frame_authorized = 1;
541 break;
542 case AP_RX_DROP:
543 goto rx_dropped;
544 case AP_RX_EXIT:
545 goto rx_exit;
546 }
547 }
548 #endif
549
550 /* Nullfunc frames may have PS-bit set, so they must be passed to
551 * hostap_handle_sta_rx() before being dropped here. */
552
553 stype &= ~IEEE80211_STYPE_QOS_DATA;
554
555 if (stype != IEEE80211_STYPE_DATA &&
556 stype != IEEE80211_STYPE_DATA_CFACK &&
557 stype != IEEE80211_STYPE_DATA_CFPOLL &&
558 stype != IEEE80211_STYPE_DATA_CFACKPOLL) {
559 if (stype != IEEE80211_STYPE_NULLFUNC)
560 LIBIPW_DEBUG_DROP("RX: dropped data frame "
561 "with no data (type=0x%02x, "
562 "subtype=0x%02x, len=%d)\n",
563 type, stype, skb->len);
564 goto rx_dropped;
565 }
566
567 /* skb: hdr + (possibly fragmented, possibly encrypted) payload */
568
569 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
570 (keyidx = libipw_rx_frame_decrypt(ieee, skb, crypt)) < 0)
571 goto rx_dropped;
572
573 hdr = (struct libipw_hdr_4addr *)skb->data;
574
575 /* skb: hdr + (possibly fragmented) plaintext payload */
576 // PR: FIXME: hostap has additional conditions in the "if" below:
577 // ieee->host_decrypt && (fc & IEEE80211_FCTL_PROTECTED) &&
578 if ((frag != 0) || (fc & IEEE80211_FCTL_MOREFRAGS)) {
579 int flen;
580 struct sk_buff *frag_skb = libipw_frag_cache_get(ieee, hdr);
581 LIBIPW_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
582
583 if (!frag_skb) {
584 LIBIPW_DEBUG(LIBIPW_DL_RX | LIBIPW_DL_FRAG,
585 "Rx cannot get skb from fragment "
586 "cache (morefrag=%d seq=%u frag=%u)\n",
587 (fc & IEEE80211_FCTL_MOREFRAGS) != 0,
588 WLAN_GET_SEQ_SEQ(sc), frag);
589 goto rx_dropped;
590 }
591
592 flen = skb->len;
593 if (frag != 0)
594 flen -= hdrlen;
595
596 if (frag_skb->tail + flen > frag_skb->end) {
597 printk(KERN_WARNING "%s: host decrypted and "
598 "reassembled frame did not fit skb\n",
599 dev->name);
600 libipw_frag_cache_invalidate(ieee, hdr);
601 goto rx_dropped;
602 }
603
604 if (frag == 0) {
605 /* copy first fragment (including full headers) into
606 * beginning of the fragment cache skb */
607 skb_copy_from_linear_data(skb, skb_put(frag_skb, flen), flen);
608 } else {
609 /* append frame payload to the end of the fragment
610 * cache skb */
611 skb_copy_from_linear_data_offset(skb, hdrlen,
612 skb_put(frag_skb, flen), flen);
613 }
614 dev_kfree_skb_any(skb);
615 skb = NULL;
616
617 if (fc & IEEE80211_FCTL_MOREFRAGS) {
618 /* more fragments expected - leave the skb in fragment
619 * cache for now; it will be delivered to upper layers
620 * after all fragments have been received */
621 goto rx_exit;
622 }
623
624 /* this was the last fragment and the frame will be
625 * delivered, so remove skb from fragment cache */
626 skb = frag_skb;
627 hdr = (struct libipw_hdr_4addr *)skb->data;
628 libipw_frag_cache_invalidate(ieee, hdr);
629 }
630
631 /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
632 * encrypted/authenticated */
633 if ((fc & IEEE80211_FCTL_PROTECTED) && can_be_decrypted &&
634 libipw_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt))
635 goto rx_dropped;
636
637 hdr = (struct libipw_hdr_4addr *)skb->data;
638 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep) {
639 if ( /*ieee->ieee802_1x && */
640 libipw_is_eapol_frame(ieee, skb)) {
641 /* pass unencrypted EAPOL frames even if encryption is
642 * configured */
643 } else {
644 LIBIPW_DEBUG_DROP("encryption configured, but RX "
645 "frame not encrypted (SA=%pM)\n",
646 hdr->addr2);
647 goto rx_dropped;
648 }
649 }
650
651 if (crypt && !(fc & IEEE80211_FCTL_PROTECTED) && !ieee->open_wep &&
652 !libipw_is_eapol_frame(ieee, skb)) {
653 LIBIPW_DEBUG_DROP("dropped unencrypted RX data "
654 "frame from %pM (drop_unencrypted=1)\n",
655 hdr->addr2);
656 goto rx_dropped;
657 }
658
659 /* If the frame was decrypted in hardware, we may need to strip off
660 * any security data (IV, ICV, etc) that was left behind */
661 if (!can_be_decrypted && (fc & IEEE80211_FCTL_PROTECTED) &&
662 ieee->host_strip_iv_icv) {
663 int trimlen = 0;
664
665 /* Top two-bits of byte 3 are the key index */
666 if (skb->len >= hdrlen + 3)
667 keyidx = skb->data[hdrlen + 3] >> 6;
668
669 /* To strip off any security data which appears before the
670 * payload, we simply increase hdrlen (as the header gets
671 * chopped off immediately below). For the security data which
672 * appears after the payload, we use skb_trim. */
673
674 switch (ieee->sec.encode_alg[keyidx]) {
675 case SEC_ALG_WEP:
676 /* 4 byte IV */
677 hdrlen += 4;
678 /* 4 byte ICV */
679 trimlen = 4;
680 break;
681 case SEC_ALG_TKIP:
682 /* 4 byte IV, 4 byte ExtIV */
683 hdrlen += 8;
684 /* 8 byte MIC, 4 byte ICV */
685 trimlen = 12;
686 break;
687 case SEC_ALG_CCMP:
688 /* 8 byte CCMP header */
689 hdrlen += 8;
690 /* 8 byte MIC */
691 trimlen = 8;
692 break;
693 }
694
695 if (skb->len < trimlen)
696 goto rx_dropped;
697
698 __skb_trim(skb, skb->len - trimlen);
699
700 if (skb->len < hdrlen)
701 goto rx_dropped;
702 }
703
704 /* skb: hdr + (possible reassembled) full plaintext payload */
705
706 payload = skb->data + hdrlen;
707 ethertype = (payload[6] << 8) | payload[7];
708
709 #ifdef NOT_YET
710 /* If IEEE 802.1X is used, check whether the port is authorized to send
711 * the received frame. */
712 if (ieee->ieee802_1x && ieee->iw_mode == IW_MODE_MASTER) {
713 if (ethertype == ETH_P_PAE) {
714 printk(KERN_DEBUG "%s: RX: IEEE 802.1X frame\n",
715 dev->name);
716 if (ieee->hostapd && ieee->apdev) {
717 /* Send IEEE 802.1X frames to the user
718 * space daemon for processing */
719 prism2_rx_80211(ieee->apdev, skb, rx_stats,
720 PRISM2_RX_MGMT);
721 ieee->apdevstats.rx_packets++;
722 ieee->apdevstats.rx_bytes += skb->len;
723 goto rx_exit;
724 }
725 } else if (!frame_authorized) {
726 printk(KERN_DEBUG "%s: dropped frame from "
727 "unauthorized port (IEEE 802.1X): "
728 "ethertype=0x%04x\n", dev->name, ethertype);
729 goto rx_dropped;
730 }
731 }
732 #endif
733
734 /* convert hdr + possible LLC headers into Ethernet header */
735 if (skb->len - hdrlen >= 8 &&
736 ((memcmp(payload, libipw_rfc1042_header, SNAP_SIZE) == 0 &&
737 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
738 memcmp(payload, libipw_bridge_tunnel_header, SNAP_SIZE) == 0)) {
739 /* remove RFC1042 or Bridge-Tunnel encapsulation and
740 * replace EtherType */
741 skb_pull(skb, hdrlen + SNAP_SIZE);
742 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
743 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
744 } else {
745 __be16 len;
746 /* Leave Ethernet header part of hdr and full payload */
747 skb_pull(skb, hdrlen);
748 len = htons(skb->len);
749 memcpy(skb_push(skb, 2), &len, 2);
750 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
751 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
752 }
753
754 #ifdef NOT_YET
755 if (wds && ((fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
756 IEEE80211_FCTL_TODS) && skb->len >= ETH_HLEN + ETH_ALEN) {
757 /* Non-standard frame: get addr4 from its bogus location after
758 * the payload */
759 skb_copy_to_linear_data_offset(skb, ETH_ALEN,
760 skb->data + skb->len - ETH_ALEN,
761 ETH_ALEN);
762 skb_trim(skb, skb->len - ETH_ALEN);
763 }
764 #endif
765
766 dev->stats.rx_packets++;
767 dev->stats.rx_bytes += skb->len;
768
769 #ifdef NOT_YET
770 if (ieee->iw_mode == IW_MODE_MASTER && !wds && ieee->ap->bridge_packets) {
771 if (is_multicast_ether_addr(dst)) {
772 /* copy multicast frame both to the higher layers and
773 * to the wireless media */
774 ieee->ap->bridged_multicast++;
775 skb2 = skb_clone(skb, GFP_ATOMIC);
776 if (skb2 == NULL)
777 printk(KERN_DEBUG "%s: skb_clone failed for "
778 "multicast frame\n", dev->name);
779 } else if (hostap_is_sta_assoc(ieee->ap, dst)) {
780 /* send frame directly to the associated STA using
781 * wireless media and not passing to higher layers */
782 ieee->ap->bridged_unicast++;
783 skb2 = skb;
784 skb = NULL;
785 }
786 }
787
788 if (skb2 != NULL) {
789 /* send to wireless media */
790 skb2->dev = dev;
791 skb2->protocol = htons(ETH_P_802_3);
792 skb_reset_mac_header(skb2);
793 skb_reset_network_header(skb2);
794 /* skb2->network_header += ETH_HLEN; */
795 dev_queue_xmit(skb2);
796 }
797 #endif
798
799 if (skb) {
800 skb->protocol = eth_type_trans(skb, dev);
801 memset(skb->cb, 0, sizeof(skb->cb));
802 skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
803 if (netif_rx(skb) == NET_RX_DROP) {
804 /* netif_rx always succeeds, but it might drop
805 * the packet. If it drops the packet, we log that
806 * in our stats. */
807 LIBIPW_DEBUG_DROP
808 ("RX: netif_rx dropped the packet\n");
809 dev->stats.rx_dropped++;
810 }
811 }
812
813 rx_exit:
814 #ifdef NOT_YET
815 if (sta)
816 hostap_handle_sta_release(sta);
817 #endif
818 return 1;
819
820 rx_dropped:
821 dev->stats.rx_dropped++;
822
823 /* Returning 0 indicates to caller that we have not handled the SKB--
824 * so it is still allocated and can be used again by underlying
825 * hardware as a DMA target */
826 return 0;
827 }
828
829 /* Filter out unrelated packets, call libipw_rx[_mgt]
830 * This function takes over the skb, it should not be used again after calling
831 * this function. */
libipw_rx_any(struct libipw_device * ieee,struct sk_buff * skb,struct libipw_rx_stats * stats)832 void libipw_rx_any(struct libipw_device *ieee,
833 struct sk_buff *skb, struct libipw_rx_stats *stats)
834 {
835 struct libipw_hdr_4addr *hdr;
836 int is_packet_for_us;
837 u16 fc;
838
839 if (ieee->iw_mode == IW_MODE_MONITOR) {
840 if (!libipw_rx(ieee, skb, stats))
841 dev_kfree_skb_irq(skb);
842 return;
843 }
844
845 if (skb->len < sizeof(struct ieee80211_hdr))
846 goto drop_free;
847
848 hdr = (struct libipw_hdr_4addr *)skb->data;
849 fc = le16_to_cpu(hdr->frame_ctl);
850
851 if ((fc & IEEE80211_FCTL_VERS) != 0)
852 goto drop_free;
853
854 switch (fc & IEEE80211_FCTL_FTYPE) {
855 case IEEE80211_FTYPE_MGMT:
856 if (skb->len < sizeof(struct libipw_hdr_3addr))
857 goto drop_free;
858 libipw_rx_mgt(ieee, hdr, stats);
859 dev_kfree_skb_irq(skb);
860 return;
861 case IEEE80211_FTYPE_DATA:
862 break;
863 case IEEE80211_FTYPE_CTL:
864 return;
865 default:
866 return;
867 }
868
869 is_packet_for_us = 0;
870 switch (ieee->iw_mode) {
871 case IW_MODE_ADHOC:
872 /* our BSS and not from/to DS */
873 if (ether_addr_equal(hdr->addr3, ieee->bssid))
874 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == 0) {
875 /* promisc: get all */
876 if (ieee->dev->flags & IFF_PROMISC)
877 is_packet_for_us = 1;
878 /* to us */
879 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr))
880 is_packet_for_us = 1;
881 /* mcast */
882 else if (is_multicast_ether_addr(hdr->addr1))
883 is_packet_for_us = 1;
884 }
885 break;
886 case IW_MODE_INFRA:
887 /* our BSS (== from our AP) and from DS */
888 if (ether_addr_equal(hdr->addr2, ieee->bssid))
889 if ((fc & (IEEE80211_FCTL_TODS+IEEE80211_FCTL_FROMDS)) == IEEE80211_FCTL_FROMDS) {
890 /* promisc: get all */
891 if (ieee->dev->flags & IFF_PROMISC)
892 is_packet_for_us = 1;
893 /* to us */
894 else if (ether_addr_equal(hdr->addr1, ieee->dev->dev_addr))
895 is_packet_for_us = 1;
896 /* mcast */
897 else if (is_multicast_ether_addr(hdr->addr1)) {
898 /* not our own packet bcasted from AP */
899 if (!ether_addr_equal(hdr->addr3, ieee->dev->dev_addr))
900 is_packet_for_us = 1;
901 }
902 }
903 break;
904 default:
905 /* ? */
906 break;
907 }
908
909 if (is_packet_for_us)
910 if (!libipw_rx(ieee, skb, stats))
911 dev_kfree_skb_irq(skb);
912 return;
913
914 drop_free:
915 dev_kfree_skb_irq(skb);
916 ieee->dev->stats.rx_dropped++;
917 }
918
919 #define MGMT_FRAME_FIXED_PART_LENGTH 0x24
920
921 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
922
923 /*
924 * Make the structure we read from the beacon packet to have
925 * the right values
926 */
libipw_verify_qos_info(struct libipw_qos_information_element * info_element,int sub_type)927 static int libipw_verify_qos_info(struct libipw_qos_information_element
928 *info_element, int sub_type)
929 {
930 if (info_element->elementID != QOS_ELEMENT_ID)
931 return -1;
932 if (info_element->qui_subtype != sub_type)
933 return -1;
934 if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
935 return -1;
936 if (info_element->qui_type != QOS_OUI_TYPE)
937 return -1;
938 if (info_element->version != QOS_VERSION_1)
939 return -1;
940
941 return 0;
942 }
943
944 /*
945 * Parse a QoS parameter element
946 */
libipw_read_qos_param_element(struct libipw_qos_parameter_info * element_param,struct libipw_info_element * info_element)947 static int libipw_read_qos_param_element(
948 struct libipw_qos_parameter_info *element_param,
949 struct libipw_info_element *info_element)
950 {
951 size_t size = sizeof(*element_param);
952
953 if (!element_param || !info_element || info_element->len != size - 2)
954 return -1;
955
956 memcpy(element_param, info_element, size);
957 return libipw_verify_qos_info(&element_param->info_element,
958 QOS_OUI_PARAM_SUB_TYPE);
959 }
960
961 /*
962 * Parse a QoS information element
963 */
libipw_read_qos_info_element(struct libipw_qos_information_element * element_info,struct libipw_info_element * info_element)964 static int libipw_read_qos_info_element(
965 struct libipw_qos_information_element *element_info,
966 struct libipw_info_element *info_element)
967 {
968 size_t size = sizeof(struct libipw_qos_information_element) - 2;
969
970 if (!element_info || !info_element || info_element->len != size - 2)
971 return -1;
972
973 memcpy(element_info, info_element, size);
974 return libipw_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
975 }
976
977 /*
978 * Write QoS parameters from the ac parameters.
979 */
libipw_qos_convert_ac_to_parameters(struct libipw_qos_parameter_info * param_elm,struct libipw_qos_parameters * qos_param)980 static void libipw_qos_convert_ac_to_parameters(struct
981 libipw_qos_parameter_info
982 *param_elm, struct
983 libipw_qos_parameters
984 *qos_param)
985 {
986 int i;
987 struct libipw_qos_ac_parameter *ac_params;
988 u32 txop;
989 u8 cw_min;
990 u8 cw_max;
991
992 for (i = 0; i < QOS_QUEUE_NUM; i++) {
993 ac_params = &(param_elm->ac_params_record[i]);
994
995 qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;
996 qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;
997
998 cw_min = ac_params->ecw_min_max & 0x0F;
999 qos_param->cw_min[i] = cpu_to_le16((1 << cw_min) - 1);
1000
1001 cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;
1002 qos_param->cw_max[i] = cpu_to_le16((1 << cw_max) - 1);
1003
1004 qos_param->flag[i] =
1005 (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1006
1007 txop = le16_to_cpu(ac_params->tx_op_limit) * 32;
1008 qos_param->tx_op_limit[i] = cpu_to_le16(txop);
1009 }
1010 }
1011
1012 /*
1013 * we have a generic data element which it may contain QoS information or
1014 * parameters element. check the information element length to decide
1015 * which type to read
1016 */
libipw_parse_qos_info_param_IE(struct libipw_info_element * info_element,struct libipw_network * network)1017 static int libipw_parse_qos_info_param_IE(struct libipw_info_element
1018 *info_element,
1019 struct libipw_network *network)
1020 {
1021 int rc = 0;
1022 struct libipw_qos_parameters *qos_param = NULL;
1023 struct libipw_qos_information_element qos_info_element;
1024
1025 rc = libipw_read_qos_info_element(&qos_info_element, info_element);
1026
1027 if (rc == 0) {
1028 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1029 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1030 } else {
1031 struct libipw_qos_parameter_info param_element;
1032
1033 rc = libipw_read_qos_param_element(¶m_element,
1034 info_element);
1035 if (rc == 0) {
1036 qos_param = &(network->qos_data.parameters);
1037 libipw_qos_convert_ac_to_parameters(¶m_element,
1038 qos_param);
1039 network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1040 network->qos_data.param_count =
1041 param_element.info_element.ac_info & 0x0F;
1042 }
1043 }
1044
1045 if (rc == 0) {
1046 LIBIPW_DEBUG_QOS("QoS is supported\n");
1047 network->qos_data.supported = 1;
1048 }
1049 return rc;
1050 }
1051
1052 #ifdef CONFIG_LIBIPW_DEBUG
1053 #define MFIE_STRING(x) case WLAN_EID_ ##x: return #x
1054
get_info_element_string(u16 id)1055 static const char *get_info_element_string(u16 id)
1056 {
1057 switch (id) {
1058 MFIE_STRING(SSID);
1059 MFIE_STRING(SUPP_RATES);
1060 MFIE_STRING(FH_PARAMS);
1061 MFIE_STRING(DS_PARAMS);
1062 MFIE_STRING(CF_PARAMS);
1063 MFIE_STRING(TIM);
1064 MFIE_STRING(IBSS_PARAMS);
1065 MFIE_STRING(COUNTRY);
1066 MFIE_STRING(REQUEST);
1067 MFIE_STRING(CHALLENGE);
1068 MFIE_STRING(PWR_CONSTRAINT);
1069 MFIE_STRING(PWR_CAPABILITY);
1070 MFIE_STRING(TPC_REQUEST);
1071 MFIE_STRING(TPC_REPORT);
1072 MFIE_STRING(SUPPORTED_CHANNELS);
1073 MFIE_STRING(CHANNEL_SWITCH);
1074 MFIE_STRING(MEASURE_REQUEST);
1075 MFIE_STRING(MEASURE_REPORT);
1076 MFIE_STRING(QUIET);
1077 MFIE_STRING(IBSS_DFS);
1078 MFIE_STRING(ERP_INFO);
1079 MFIE_STRING(RSN);
1080 MFIE_STRING(EXT_SUPP_RATES);
1081 MFIE_STRING(VENDOR_SPECIFIC);
1082 MFIE_STRING(QOS_PARAMETER);
1083 default:
1084 return "UNKNOWN";
1085 }
1086 }
1087 #endif
1088
libipw_parse_info_param(struct libipw_info_element * info_element,u16 length,struct libipw_network * network)1089 static int libipw_parse_info_param(struct libipw_info_element
1090 *info_element, u16 length,
1091 struct libipw_network *network)
1092 {
1093 u8 i;
1094 #ifdef CONFIG_LIBIPW_DEBUG
1095 char rates_str[64];
1096 char *p;
1097 #endif
1098
1099 while (length >= sizeof(*info_element)) {
1100 if (sizeof(*info_element) + info_element->len > length) {
1101 LIBIPW_DEBUG_MGMT("Info elem: parse failed: "
1102 "info_element->len + 2 > left : "
1103 "info_element->len+2=%zd left=%d, id=%d.\n",
1104 info_element->len +
1105 sizeof(*info_element),
1106 length, info_element->id);
1107 /* We stop processing but don't return an error here
1108 * because some misbehaviour APs break this rule. ie.
1109 * Orinoco AP1000. */
1110 break;
1111 }
1112
1113 switch (info_element->id) {
1114 case WLAN_EID_SSID:
1115 network->ssid_len = min(info_element->len,
1116 (u8) IW_ESSID_MAX_SIZE);
1117 memcpy(network->ssid, info_element->data,
1118 network->ssid_len);
1119 if (network->ssid_len < IW_ESSID_MAX_SIZE)
1120 memset(network->ssid + network->ssid_len, 0,
1121 IW_ESSID_MAX_SIZE - network->ssid_len);
1122
1123 LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%*pE' len=%d.\n",
1124 network->ssid_len, network->ssid,
1125 network->ssid_len);
1126 break;
1127
1128 case WLAN_EID_SUPP_RATES:
1129 #ifdef CONFIG_LIBIPW_DEBUG
1130 p = rates_str;
1131 #endif
1132 network->rates_len = min(info_element->len,
1133 MAX_RATES_LENGTH);
1134 for (i = 0; i < network->rates_len; i++) {
1135 network->rates[i] = info_element->data[i];
1136 #ifdef CONFIG_LIBIPW_DEBUG
1137 p += scnprintf(p, sizeof(rates_str) -
1138 (p - rates_str), "%02X ",
1139 network->rates[i]);
1140 #endif
1141 if (libipw_is_ofdm_rate
1142 (info_element->data[i])) {
1143 network->flags |= NETWORK_HAS_OFDM;
1144 if (info_element->data[i] &
1145 LIBIPW_BASIC_RATE_MASK)
1146 network->flags &=
1147 ~NETWORK_HAS_CCK;
1148 }
1149 }
1150
1151 LIBIPW_DEBUG_MGMT("WLAN_EID_SUPP_RATES: '%s' (%d)\n",
1152 rates_str, network->rates_len);
1153 break;
1154
1155 case WLAN_EID_EXT_SUPP_RATES:
1156 #ifdef CONFIG_LIBIPW_DEBUG
1157 p = rates_str;
1158 #endif
1159 network->rates_ex_len = min(info_element->len,
1160 MAX_RATES_EX_LENGTH);
1161 for (i = 0; i < network->rates_ex_len; i++) {
1162 network->rates_ex[i] = info_element->data[i];
1163 #ifdef CONFIG_LIBIPW_DEBUG
1164 p += scnprintf(p, sizeof(rates_str) -
1165 (p - rates_str), "%02X ",
1166 network->rates_ex[i]);
1167 #endif
1168 if (libipw_is_ofdm_rate
1169 (info_element->data[i])) {
1170 network->flags |= NETWORK_HAS_OFDM;
1171 if (info_element->data[i] &
1172 LIBIPW_BASIC_RATE_MASK)
1173 network->flags &=
1174 ~NETWORK_HAS_CCK;
1175 }
1176 }
1177
1178 LIBIPW_DEBUG_MGMT("WLAN_EID_EXT_SUPP_RATES: '%s' (%d)\n",
1179 rates_str, network->rates_ex_len);
1180 break;
1181
1182 case WLAN_EID_DS_PARAMS:
1183 LIBIPW_DEBUG_MGMT("WLAN_EID_DS_PARAMS: %d\n",
1184 info_element->data[0]);
1185 network->channel = info_element->data[0];
1186 break;
1187
1188 case WLAN_EID_FH_PARAMS:
1189 LIBIPW_DEBUG_MGMT("WLAN_EID_FH_PARAMS: ignored\n");
1190 break;
1191
1192 case WLAN_EID_CF_PARAMS:
1193 LIBIPW_DEBUG_MGMT("WLAN_EID_CF_PARAMS: ignored\n");
1194 break;
1195
1196 case WLAN_EID_TIM:
1197 network->tim.tim_count = info_element->data[0];
1198 network->tim.tim_period = info_element->data[1];
1199 LIBIPW_DEBUG_MGMT("WLAN_EID_TIM: partially ignored\n");
1200 break;
1201
1202 case WLAN_EID_ERP_INFO:
1203 network->erp_value = info_element->data[0];
1204 network->flags |= NETWORK_HAS_ERP_VALUE;
1205 LIBIPW_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1206 network->erp_value);
1207 break;
1208
1209 case WLAN_EID_IBSS_PARAMS:
1210 network->atim_window = info_element->data[0];
1211 LIBIPW_DEBUG_MGMT("WLAN_EID_IBSS_PARAMS: %d\n",
1212 network->atim_window);
1213 break;
1214
1215 case WLAN_EID_CHALLENGE:
1216 LIBIPW_DEBUG_MGMT("WLAN_EID_CHALLENGE: ignored\n");
1217 break;
1218
1219 case WLAN_EID_VENDOR_SPECIFIC:
1220 LIBIPW_DEBUG_MGMT("WLAN_EID_VENDOR_SPECIFIC: %d bytes\n",
1221 info_element->len);
1222 if (!libipw_parse_qos_info_param_IE(info_element,
1223 network))
1224 break;
1225
1226 if (info_element->len >= 4 &&
1227 info_element->data[0] == 0x00 &&
1228 info_element->data[1] == 0x50 &&
1229 info_element->data[2] == 0xf2 &&
1230 info_element->data[3] == 0x01) {
1231 network->wpa_ie_len = min(info_element->len + 2,
1232 MAX_WPA_IE_LEN);
1233 memcpy(network->wpa_ie, info_element,
1234 network->wpa_ie_len);
1235 }
1236 break;
1237
1238 case WLAN_EID_RSN:
1239 LIBIPW_DEBUG_MGMT("WLAN_EID_RSN: %d bytes\n",
1240 info_element->len);
1241 network->rsn_ie_len = min(info_element->len + 2,
1242 MAX_WPA_IE_LEN);
1243 memcpy(network->rsn_ie, info_element,
1244 network->rsn_ie_len);
1245 break;
1246
1247 case WLAN_EID_QOS_PARAMETER:
1248 printk(KERN_ERR
1249 "QoS Error need to parse QOS_PARAMETER IE\n");
1250 break;
1251 /* 802.11h */
1252 case WLAN_EID_PWR_CONSTRAINT:
1253 network->power_constraint = info_element->data[0];
1254 network->flags |= NETWORK_HAS_POWER_CONSTRAINT;
1255 break;
1256
1257 case WLAN_EID_CHANNEL_SWITCH:
1258 network->power_constraint = info_element->data[0];
1259 network->flags |= NETWORK_HAS_CSA;
1260 break;
1261
1262 case WLAN_EID_QUIET:
1263 network->quiet.count = info_element->data[0];
1264 network->quiet.period = info_element->data[1];
1265 network->quiet.duration = info_element->data[2];
1266 network->quiet.offset = info_element->data[3];
1267 network->flags |= NETWORK_HAS_QUIET;
1268 break;
1269
1270 case WLAN_EID_IBSS_DFS:
1271 network->flags |= NETWORK_HAS_IBSS_DFS;
1272 break;
1273
1274 case WLAN_EID_TPC_REPORT:
1275 network->tpc_report.transmit_power =
1276 info_element->data[0];
1277 network->tpc_report.link_margin = info_element->data[1];
1278 network->flags |= NETWORK_HAS_TPC_REPORT;
1279 break;
1280
1281 default:
1282 LIBIPW_DEBUG_MGMT
1283 ("Unsupported info element: %s (%d)\n",
1284 get_info_element_string(info_element->id),
1285 info_element->id);
1286 break;
1287 }
1288
1289 length -= sizeof(*info_element) + info_element->len;
1290 info_element =
1291 (struct libipw_info_element *)&info_element->
1292 data[info_element->len];
1293 }
1294
1295 return 0;
1296 }
1297
libipw_handle_assoc_resp(struct libipw_device * ieee,struct libipw_assoc_response * frame,struct libipw_rx_stats * stats)1298 static int libipw_handle_assoc_resp(struct libipw_device *ieee, struct libipw_assoc_response
1299 *frame, struct libipw_rx_stats *stats)
1300 {
1301 struct libipw_network network_resp = { };
1302 struct libipw_network *network = &network_resp;
1303 struct net_device *dev = ieee->dev;
1304
1305 network->flags = 0;
1306 network->qos_data.active = 0;
1307 network->qos_data.supported = 0;
1308 network->qos_data.param_count = 0;
1309 network->qos_data.old_param_count = 0;
1310
1311 //network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);
1312 network->atim_window = le16_to_cpu(frame->aid);
1313 network->listen_interval = le16_to_cpu(frame->status);
1314 memcpy(network->bssid, frame->header.addr3, ETH_ALEN);
1315 network->capability = le16_to_cpu(frame->capability);
1316 network->last_scanned = jiffies;
1317 network->rates_len = network->rates_ex_len = 0;
1318 network->last_associate = 0;
1319 network->ssid_len = 0;
1320 network->erp_value =
1321 (network->capability & WLAN_CAPABILITY_IBSS) ? 0x3 : 0x0;
1322
1323 if (stats->freq == LIBIPW_52GHZ_BAND) {
1324 /* for A band (No DS info) */
1325 network->channel = stats->received_channel;
1326 } else
1327 network->flags |= NETWORK_HAS_CCK;
1328
1329 network->wpa_ie_len = 0;
1330 network->rsn_ie_len = 0;
1331
1332 if (libipw_parse_info_param((void *)frame->variable,
1333 stats->len - sizeof(*frame), network))
1334 return 1;
1335
1336 network->mode = 0;
1337 if (stats->freq == LIBIPW_52GHZ_BAND)
1338 network->mode = IEEE_A;
1339 else {
1340 if (network->flags & NETWORK_HAS_OFDM)
1341 network->mode |= IEEE_G;
1342 if (network->flags & NETWORK_HAS_CCK)
1343 network->mode |= IEEE_B;
1344 }
1345
1346 memcpy(&network->stats, stats, sizeof(network->stats));
1347
1348 if (ieee->handle_assoc_response != NULL)
1349 ieee->handle_assoc_response(dev, frame, network);
1350
1351 return 0;
1352 }
1353
1354 /***************************************************/
1355
libipw_network_init(struct libipw_device * ieee,struct libipw_probe_response * beacon,struct libipw_network * network,struct libipw_rx_stats * stats)1356 static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_response
1357 *beacon,
1358 struct libipw_network *network,
1359 struct libipw_rx_stats *stats)
1360 {
1361 network->qos_data.active = 0;
1362 network->qos_data.supported = 0;
1363 network->qos_data.param_count = 0;
1364 network->qos_data.old_param_count = 0;
1365
1366 /* Pull out fixed field data */
1367 memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
1368 network->capability = le16_to_cpu(beacon->capability);
1369 network->last_scanned = jiffies;
1370 network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
1371 network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
1372 network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
1373 /* Where to pull this? beacon->listen_interval; */
1374 network->listen_interval = 0x0A;
1375 network->rates_len = network->rates_ex_len = 0;
1376 network->last_associate = 0;
1377 network->ssid_len = 0;
1378 network->flags = 0;
1379 network->atim_window = 0;
1380 network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
1381 0x3 : 0x0;
1382
1383 if (stats->freq == LIBIPW_52GHZ_BAND) {
1384 /* for A band (No DS info) */
1385 network->channel = stats->received_channel;
1386 } else
1387 network->flags |= NETWORK_HAS_CCK;
1388
1389 network->wpa_ie_len = 0;
1390 network->rsn_ie_len = 0;
1391
1392 if (libipw_parse_info_param((void *)beacon->variable,
1393 stats->len - sizeof(*beacon), network))
1394 return 1;
1395
1396 network->mode = 0;
1397 if (stats->freq == LIBIPW_52GHZ_BAND)
1398 network->mode = IEEE_A;
1399 else {
1400 if (network->flags & NETWORK_HAS_OFDM)
1401 network->mode |= IEEE_G;
1402 if (network->flags & NETWORK_HAS_CCK)
1403 network->mode |= IEEE_B;
1404 }
1405
1406 if (network->mode == 0) {
1407 LIBIPW_DEBUG_SCAN("Filtered out '%*pE (%pM)' network.\n",
1408 network->ssid_len, network->ssid,
1409 network->bssid);
1410 return 1;
1411 }
1412
1413 memcpy(&network->stats, stats, sizeof(network->stats));
1414
1415 return 0;
1416 }
1417
is_same_network(struct libipw_network * src,struct libipw_network * dst)1418 static inline int is_same_network(struct libipw_network *src,
1419 struct libipw_network *dst)
1420 {
1421 /* A network is only a duplicate if the channel, BSSID, and ESSID
1422 * all match. We treat all <hidden> with the same BSSID and channel
1423 * as one network */
1424 return ((src->ssid_len == dst->ssid_len) &&
1425 (src->channel == dst->channel) &&
1426 ether_addr_equal_64bits(src->bssid, dst->bssid) &&
1427 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1428 }
1429
update_network(struct libipw_network * dst,struct libipw_network * src)1430 static void update_network(struct libipw_network *dst,
1431 struct libipw_network *src)
1432 {
1433 int qos_active;
1434 u8 old_param;
1435
1436 /* We only update the statistics if they were created by receiving
1437 * the network information on the actual channel the network is on.
1438 *
1439 * This keeps beacons received on neighbor channels from bringing
1440 * down the signal level of an AP. */
1441 if (dst->channel == src->stats.received_channel)
1442 memcpy(&dst->stats, &src->stats,
1443 sizeof(struct libipw_rx_stats));
1444 else
1445 LIBIPW_DEBUG_SCAN("Network %pM info received "
1446 "off channel (%d vs. %d)\n", src->bssid,
1447 dst->channel, src->stats.received_channel);
1448
1449 dst->capability = src->capability;
1450 memcpy(dst->rates, src->rates, src->rates_len);
1451 dst->rates_len = src->rates_len;
1452 memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
1453 dst->rates_ex_len = src->rates_ex_len;
1454
1455 dst->mode = src->mode;
1456 dst->flags = src->flags;
1457 dst->time_stamp[0] = src->time_stamp[0];
1458 dst->time_stamp[1] = src->time_stamp[1];
1459
1460 dst->beacon_interval = src->beacon_interval;
1461 dst->listen_interval = src->listen_interval;
1462 dst->atim_window = src->atim_window;
1463 dst->erp_value = src->erp_value;
1464 dst->tim = src->tim;
1465
1466 memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
1467 dst->wpa_ie_len = src->wpa_ie_len;
1468 memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
1469 dst->rsn_ie_len = src->rsn_ie_len;
1470
1471 dst->last_scanned = jiffies;
1472 qos_active = src->qos_data.active;
1473 old_param = dst->qos_data.old_param_count;
1474 if (dst->flags & NETWORK_HAS_QOS_MASK)
1475 memcpy(&dst->qos_data, &src->qos_data,
1476 sizeof(struct libipw_qos_data));
1477 else {
1478 dst->qos_data.supported = src->qos_data.supported;
1479 dst->qos_data.param_count = src->qos_data.param_count;
1480 }
1481
1482 if (dst->qos_data.supported == 1) {
1483 if (dst->ssid_len)
1484 LIBIPW_DEBUG_QOS
1485 ("QoS the network %s is QoS supported\n",
1486 dst->ssid);
1487 else
1488 LIBIPW_DEBUG_QOS
1489 ("QoS the network is QoS supported\n");
1490 }
1491 dst->qos_data.active = qos_active;
1492 dst->qos_data.old_param_count = old_param;
1493
1494 /* dst->last_associate is not overwritten */
1495 }
1496
is_beacon(__le16 fc)1497 static inline int is_beacon(__le16 fc)
1498 {
1499 return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == IEEE80211_STYPE_BEACON);
1500 }
1501
libipw_process_probe_response(struct libipw_device * ieee,struct libipw_probe_response * beacon,struct libipw_rx_stats * stats)1502 static void libipw_process_probe_response(struct libipw_device
1503 *ieee, struct
1504 libipw_probe_response
1505 *beacon, struct libipw_rx_stats
1506 *stats)
1507 {
1508 struct net_device *dev = ieee->dev;
1509 struct libipw_network network = { };
1510 struct libipw_network *target;
1511 struct libipw_network *oldest = NULL;
1512 #ifdef CONFIG_LIBIPW_DEBUG
1513 struct libipw_info_element *info_element = (void *)beacon->variable;
1514 #endif
1515 unsigned long flags;
1516
1517 LIBIPW_DEBUG_SCAN("'%*pE' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
1518 info_element->len, info_element->data,
1519 beacon->header.addr3,
1520 (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0',
1521 (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0',
1522 (beacon->capability & cpu_to_le16(1 << 0xd)) ? '1' : '0',
1523 (beacon->capability & cpu_to_le16(1 << 0xc)) ? '1' : '0',
1524 (beacon->capability & cpu_to_le16(1 << 0xb)) ? '1' : '0',
1525 (beacon->capability & cpu_to_le16(1 << 0xa)) ? '1' : '0',
1526 (beacon->capability & cpu_to_le16(1 << 0x9)) ? '1' : '0',
1527 (beacon->capability & cpu_to_le16(1 << 0x8)) ? '1' : '0',
1528 (beacon->capability & cpu_to_le16(1 << 0x7)) ? '1' : '0',
1529 (beacon->capability & cpu_to_le16(1 << 0x6)) ? '1' : '0',
1530 (beacon->capability & cpu_to_le16(1 << 0x5)) ? '1' : '0',
1531 (beacon->capability & cpu_to_le16(1 << 0x4)) ? '1' : '0',
1532 (beacon->capability & cpu_to_le16(1 << 0x3)) ? '1' : '0',
1533 (beacon->capability & cpu_to_le16(1 << 0x2)) ? '1' : '0',
1534 (beacon->capability & cpu_to_le16(1 << 0x1)) ? '1' : '0',
1535 (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0');
1536
1537 if (libipw_network_init(ieee, beacon, &network, stats)) {
1538 LIBIPW_DEBUG_SCAN("Dropped '%*pE' (%pM) via %s.\n",
1539 info_element->len, info_element->data,
1540 beacon->header.addr3,
1541 is_beacon(beacon->header.frame_ctl) ?
1542 "BEACON" : "PROBE RESPONSE");
1543 return;
1544 }
1545
1546 /* The network parsed correctly -- so now we scan our known networks
1547 * to see if we can find it in our list.
1548 *
1549 * NOTE: This search is definitely not optimized. Once its doing
1550 * the "right thing" we'll optimize it for efficiency if
1551 * necessary */
1552
1553 /* Search for this entry in the list and update it if it is
1554 * already there. */
1555
1556 spin_lock_irqsave(&ieee->lock, flags);
1557
1558 list_for_each_entry(target, &ieee->network_list, list) {
1559 if (is_same_network(target, &network))
1560 break;
1561
1562 if ((oldest == NULL) ||
1563 time_before(target->last_scanned, oldest->last_scanned))
1564 oldest = target;
1565 }
1566
1567 /* If we didn't find a match, then get a new network slot to initialize
1568 * with this beacon's information */
1569 if (&target->list == &ieee->network_list) {
1570 if (list_empty(&ieee->network_free_list)) {
1571 /* If there are no more slots, expire the oldest */
1572 list_del(&oldest->list);
1573 target = oldest;
1574 LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n",
1575 target->ssid_len, target->ssid,
1576 target->bssid);
1577 } else {
1578 /* Otherwise just pull from the free list */
1579 target = list_entry(ieee->network_free_list.next,
1580 struct libipw_network, list);
1581 list_del(ieee->network_free_list.next);
1582 }
1583
1584 #ifdef CONFIG_LIBIPW_DEBUG
1585 LIBIPW_DEBUG_SCAN("Adding '%*pE' (%pM) via %s.\n",
1586 network.ssid_len, network.ssid,
1587 network.bssid,
1588 is_beacon(beacon->header.frame_ctl) ?
1589 "BEACON" : "PROBE RESPONSE");
1590 #endif
1591 memcpy(target, &network, sizeof(*target));
1592 list_add_tail(&target->list, &ieee->network_list);
1593 } else {
1594 LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n",
1595 target->ssid_len, target->ssid,
1596 target->bssid,
1597 is_beacon(beacon->header.frame_ctl) ?
1598 "BEACON" : "PROBE RESPONSE");
1599 update_network(target, &network);
1600 }
1601
1602 spin_unlock_irqrestore(&ieee->lock, flags);
1603
1604 if (is_beacon(beacon->header.frame_ctl)) {
1605 if (ieee->handle_beacon != NULL)
1606 ieee->handle_beacon(dev, beacon, target);
1607 } else {
1608 if (ieee->handle_probe_response != NULL)
1609 ieee->handle_probe_response(dev, beacon, target);
1610 }
1611 }
1612
libipw_rx_mgt(struct libipw_device * ieee,struct libipw_hdr_4addr * header,struct libipw_rx_stats * stats)1613 void libipw_rx_mgt(struct libipw_device *ieee,
1614 struct libipw_hdr_4addr *header,
1615 struct libipw_rx_stats *stats)
1616 {
1617 switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
1618 case IEEE80211_STYPE_ASSOC_RESP:
1619 LIBIPW_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",
1620 WLAN_FC_GET_STYPE(le16_to_cpu
1621 (header->frame_ctl)));
1622 libipw_handle_assoc_resp(ieee,
1623 (struct libipw_assoc_response *)
1624 header, stats);
1625 break;
1626
1627 case IEEE80211_STYPE_REASSOC_RESP:
1628 LIBIPW_DEBUG_MGMT("received REASSOCIATION RESPONSE (%d)\n",
1629 WLAN_FC_GET_STYPE(le16_to_cpu
1630 (header->frame_ctl)));
1631 break;
1632
1633 case IEEE80211_STYPE_PROBE_REQ:
1634 LIBIPW_DEBUG_MGMT("received auth (%d)\n",
1635 WLAN_FC_GET_STYPE(le16_to_cpu
1636 (header->frame_ctl)));
1637
1638 if (ieee->handle_probe_request != NULL)
1639 ieee->handle_probe_request(ieee->dev,
1640 (struct
1641 libipw_probe_request *)
1642 header, stats);
1643 break;
1644
1645 case IEEE80211_STYPE_PROBE_RESP:
1646 LIBIPW_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
1647 WLAN_FC_GET_STYPE(le16_to_cpu
1648 (header->frame_ctl)));
1649 LIBIPW_DEBUG_SCAN("Probe response\n");
1650 libipw_process_probe_response(ieee,
1651 (struct
1652 libipw_probe_response *)
1653 header, stats);
1654 break;
1655
1656 case IEEE80211_STYPE_BEACON:
1657 LIBIPW_DEBUG_MGMT("received BEACON (%d)\n",
1658 WLAN_FC_GET_STYPE(le16_to_cpu
1659 (header->frame_ctl)));
1660 LIBIPW_DEBUG_SCAN("Beacon\n");
1661 libipw_process_probe_response(ieee,
1662 (struct
1663 libipw_probe_response *)
1664 header, stats);
1665 break;
1666 case IEEE80211_STYPE_AUTH:
1667
1668 LIBIPW_DEBUG_MGMT("received auth (%d)\n",
1669 WLAN_FC_GET_STYPE(le16_to_cpu
1670 (header->frame_ctl)));
1671
1672 if (ieee->handle_auth != NULL)
1673 ieee->handle_auth(ieee->dev,
1674 (struct libipw_auth *)header);
1675 break;
1676
1677 case IEEE80211_STYPE_DISASSOC:
1678 if (ieee->handle_disassoc != NULL)
1679 ieee->handle_disassoc(ieee->dev,
1680 (struct libipw_disassoc *)
1681 header);
1682 break;
1683
1684 case IEEE80211_STYPE_ACTION:
1685 LIBIPW_DEBUG_MGMT("ACTION\n");
1686 if (ieee->handle_action)
1687 ieee->handle_action(ieee->dev,
1688 (struct libipw_action *)
1689 header, stats);
1690 break;
1691
1692 case IEEE80211_STYPE_REASSOC_REQ:
1693 LIBIPW_DEBUG_MGMT("received reassoc (%d)\n",
1694 WLAN_FC_GET_STYPE(le16_to_cpu
1695 (header->frame_ctl)));
1696
1697 LIBIPW_DEBUG_MGMT("%s: LIBIPW_REASSOC_REQ received\n",
1698 ieee->dev->name);
1699 if (ieee->handle_reassoc_request != NULL)
1700 ieee->handle_reassoc_request(ieee->dev,
1701 (struct libipw_reassoc_request *)
1702 header);
1703 break;
1704
1705 case IEEE80211_STYPE_ASSOC_REQ:
1706 LIBIPW_DEBUG_MGMT("received assoc (%d)\n",
1707 WLAN_FC_GET_STYPE(le16_to_cpu
1708 (header->frame_ctl)));
1709
1710 LIBIPW_DEBUG_MGMT("%s: LIBIPW_ASSOC_REQ received\n",
1711 ieee->dev->name);
1712 if (ieee->handle_assoc_request != NULL)
1713 ieee->handle_assoc_request(ieee->dev);
1714 break;
1715
1716 case IEEE80211_STYPE_DEAUTH:
1717 LIBIPW_DEBUG_MGMT("DEAUTH\n");
1718 if (ieee->handle_deauth != NULL)
1719 ieee->handle_deauth(ieee->dev,
1720 (struct libipw_deauth *)
1721 header);
1722 break;
1723 default:
1724 LIBIPW_DEBUG_MGMT("received UNKNOWN (%d)\n",
1725 WLAN_FC_GET_STYPE(le16_to_cpu
1726 (header->frame_ctl)));
1727 LIBIPW_DEBUG_MGMT("%s: Unknown management packet: %d\n",
1728 ieee->dev->name,
1729 WLAN_FC_GET_STYPE(le16_to_cpu
1730 (header->frame_ctl)));
1731 break;
1732 }
1733 }
1734
1735 EXPORT_SYMBOL_GPL(libipw_rx_any);
1736 EXPORT_SYMBOL(libipw_rx_mgt);
1737 EXPORT_SYMBOL(libipw_rx);
1738