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[MAC80211]: Add mac80211 wireless stack.
[deliverable/linux.git] / net / mac80211 / ieee80211.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11 #include <net/mac80211.h>
12 #include <net/ieee80211_radiotap.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/rtnetlink.h>
23 #include <net/iw_handler.h>
24 #include <linux/compiler.h>
25 #include <linux/bitmap.h>
26 #include <net/cfg80211.h>
27
28 #include "ieee80211_common.h"
29 #include "ieee80211_i.h"
30 #include "ieee80211_rate.h"
31 #include "wep.h"
32 #include "wpa.h"
33 #include "tkip.h"
34 #include "wme.h"
35 #include "aes_ccm.h"
36 #include "ieee80211_led.h"
37 #include "ieee80211_cfg.h"
38
39 /* privid for wiphys to determine whether they belong to us or not */
40 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
41
42 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
43 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
44 static const unsigned char rfc1042_header[] =
45 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
46
47 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
48 static const unsigned char bridge_tunnel_header[] =
49 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
50
51 /* No encapsulation header if EtherType < 0x600 (=length) */
52 static const unsigned char eapol_header[] =
53 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
54
55
56 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
57 struct ieee80211_hdr *hdr)
58 {
59 /* Set the sequence number for this frame. */
60 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
61
62 /* Increase the sequence number. */
63 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
64 }
65
66 struct ieee80211_key_conf *
67 ieee80211_key_data2conf(struct ieee80211_local *local,
68 const struct ieee80211_key *data)
69 {
70 struct ieee80211_key_conf *conf;
71
72 conf = kmalloc(sizeof(*conf) + data->keylen, GFP_ATOMIC);
73 if (!conf)
74 return NULL;
75
76 conf->hw_key_idx = data->hw_key_idx;
77 conf->alg = data->alg;
78 conf->keylen = data->keylen;
79 conf->flags = 0;
80 if (data->force_sw_encrypt)
81 conf->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
82 conf->keyidx = data->keyidx;
83 if (data->default_tx_key)
84 conf->flags |= IEEE80211_KEY_DEFAULT_TX_KEY;
85 if (local->default_wep_only)
86 conf->flags |= IEEE80211_KEY_DEFAULT_WEP_ONLY;
87 memcpy(conf->key, data->key, data->keylen);
88
89 return conf;
90 }
91
92 struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
93 int idx, size_t key_len, gfp_t flags)
94 {
95 struct ieee80211_key *key;
96
97 key = kzalloc(sizeof(struct ieee80211_key) + key_len, flags);
98 if (!key)
99 return NULL;
100 kref_init(&key->kref);
101 return key;
102 }
103
104 static void ieee80211_key_release(struct kref *kref)
105 {
106 struct ieee80211_key *key;
107
108 key = container_of(kref, struct ieee80211_key, kref);
109 if (key->alg == ALG_CCMP)
110 ieee80211_aes_key_free(key->u.ccmp.tfm);
111 kfree(key);
112 }
113
114 void ieee80211_key_free(struct ieee80211_key *key)
115 {
116 if (key)
117 kref_put(&key->kref, ieee80211_key_release);
118 }
119
120 static int rate_list_match(const int *rate_list, int rate)
121 {
122 int i;
123
124 if (!rate_list)
125 return 0;
126
127 for (i = 0; rate_list[i] >= 0; i++)
128 if (rate_list[i] == rate)
129 return 1;
130
131 return 0;
132 }
133
134
135 void ieee80211_prepare_rates(struct ieee80211_local *local,
136 struct ieee80211_hw_mode *mode)
137 {
138 int i;
139
140 for (i = 0; i < mode->num_rates; i++) {
141 struct ieee80211_rate *rate = &mode->rates[i];
142
143 rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
144 IEEE80211_RATE_BASIC);
145
146 if (local->supp_rates[mode->mode]) {
147 if (!rate_list_match(local->supp_rates[mode->mode],
148 rate->rate))
149 continue;
150 }
151
152 rate->flags |= IEEE80211_RATE_SUPPORTED;
153
154 /* Use configured basic rate set if it is available. If not,
155 * use defaults that are sane for most cases. */
156 if (local->basic_rates[mode->mode]) {
157 if (rate_list_match(local->basic_rates[mode->mode],
158 rate->rate))
159 rate->flags |= IEEE80211_RATE_BASIC;
160 } else switch (mode->mode) {
161 case MODE_IEEE80211A:
162 if (rate->rate == 60 || rate->rate == 120 ||
163 rate->rate == 240)
164 rate->flags |= IEEE80211_RATE_BASIC;
165 break;
166 case MODE_IEEE80211B:
167 if (rate->rate == 10 || rate->rate == 20)
168 rate->flags |= IEEE80211_RATE_BASIC;
169 break;
170 case MODE_ATHEROS_TURBO:
171 if (rate->rate == 120 || rate->rate == 240 ||
172 rate->rate == 480)
173 rate->flags |= IEEE80211_RATE_BASIC;
174 break;
175 case MODE_IEEE80211G:
176 if (rate->rate == 10 || rate->rate == 20 ||
177 rate->rate == 55 || rate->rate == 110)
178 rate->flags |= IEEE80211_RATE_BASIC;
179 break;
180 }
181
182 /* Set ERP and MANDATORY flags based on phymode */
183 switch (mode->mode) {
184 case MODE_IEEE80211A:
185 if (rate->rate == 60 || rate->rate == 120 ||
186 rate->rate == 240)
187 rate->flags |= IEEE80211_RATE_MANDATORY;
188 break;
189 case MODE_IEEE80211B:
190 if (rate->rate == 10)
191 rate->flags |= IEEE80211_RATE_MANDATORY;
192 break;
193 case MODE_ATHEROS_TURBO:
194 break;
195 case MODE_IEEE80211G:
196 if (rate->rate == 10 || rate->rate == 20 ||
197 rate->rate == 55 || rate->rate == 110 ||
198 rate->rate == 60 || rate->rate == 120 ||
199 rate->rate == 240)
200 rate->flags |= IEEE80211_RATE_MANDATORY;
201 break;
202 }
203 if (ieee80211_is_erp_rate(mode->mode, rate->rate))
204 rate->flags |= IEEE80211_RATE_ERP;
205 }
206 }
207
208
209 static void ieee80211_key_threshold_notify(struct net_device *dev,
210 struct ieee80211_key *key,
211 struct sta_info *sta)
212 {
213 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
214 struct sk_buff *skb;
215 struct ieee80211_msg_key_notification *msg;
216
217 /* if no one will get it anyway, don't even allocate it.
218 * unlikely because this is only relevant for APs
219 * where the device must be open... */
220 if (unlikely(!local->apdev))
221 return;
222
223 skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
224 sizeof(struct ieee80211_msg_key_notification));
225 if (!skb)
226 return;
227
228 skb_reserve(skb, sizeof(struct ieee80211_frame_info));
229 msg = (struct ieee80211_msg_key_notification *)
230 skb_put(skb, sizeof(struct ieee80211_msg_key_notification));
231 msg->tx_rx_count = key->tx_rx_count;
232 memcpy(msg->ifname, dev->name, IFNAMSIZ);
233 if (sta)
234 memcpy(msg->addr, sta->addr, ETH_ALEN);
235 else
236 memset(msg->addr, 0xff, ETH_ALEN);
237
238 key->tx_rx_count = 0;
239
240 ieee80211_rx_mgmt(local, skb, NULL,
241 ieee80211_msg_key_threshold_notification);
242 }
243
244
245 static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
246 {
247 u16 fc;
248
249 if (len < 24)
250 return NULL;
251
252 fc = le16_to_cpu(hdr->frame_control);
253
254 switch (fc & IEEE80211_FCTL_FTYPE) {
255 case IEEE80211_FTYPE_DATA:
256 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
257 case IEEE80211_FCTL_TODS:
258 return hdr->addr1;
259 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
260 return NULL;
261 case IEEE80211_FCTL_FROMDS:
262 return hdr->addr2;
263 case 0:
264 return hdr->addr3;
265 }
266 break;
267 case IEEE80211_FTYPE_MGMT:
268 return hdr->addr3;
269 case IEEE80211_FTYPE_CTL:
270 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
271 return hdr->addr1;
272 else
273 return NULL;
274 }
275
276 return NULL;
277 }
278
279 int ieee80211_get_hdrlen(u16 fc)
280 {
281 int hdrlen = 24;
282
283 switch (fc & IEEE80211_FCTL_FTYPE) {
284 case IEEE80211_FTYPE_DATA:
285 if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
286 hdrlen = 30; /* Addr4 */
287 /*
288 * The QoS Control field is two bytes and its presence is
289 * indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
290 * hdrlen if that bit is set.
291 * This works by masking out the bit and shifting it to
292 * bit position 1 so the result has the value 0 or 2.
293 */
294 hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
295 >> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
296 break;
297 case IEEE80211_FTYPE_CTL:
298 /*
299 * ACK and CTS are 10 bytes, all others 16. To see how
300 * to get this condition consider
301 * subtype mask: 0b0000000011110000 (0x00F0)
302 * ACK subtype: 0b0000000011010000 (0x00D0)
303 * CTS subtype: 0b0000000011000000 (0x00C0)
304 * bits that matter: ^^^ (0x00E0)
305 * value of those: 0b0000000011000000 (0x00C0)
306 */
307 if ((fc & 0xE0) == 0xC0)
308 hdrlen = 10;
309 else
310 hdrlen = 16;
311 break;
312 }
313
314 return hdrlen;
315 }
316 EXPORT_SYMBOL(ieee80211_get_hdrlen);
317
318 int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
319 {
320 const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
321 int hdrlen;
322
323 if (unlikely(skb->len < 10))
324 return 0;
325 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
326 if (unlikely(hdrlen > skb->len))
327 return 0;
328 return hdrlen;
329 }
330 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
331
332 static int ieee80211_get_radiotap_len(struct sk_buff *skb)
333 {
334 struct ieee80211_radiotap_header *hdr =
335 (struct ieee80211_radiotap_header *) skb->data;
336
337 return le16_to_cpu(hdr->it_len);
338 }
339
340 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
341 static void ieee80211_dump_frame(const char *ifname, const char *title,
342 const struct sk_buff *skb)
343 {
344 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
345 u16 fc;
346 int hdrlen;
347
348 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
349 if (skb->len < 4) {
350 printk("\n");
351 return;
352 }
353
354 fc = le16_to_cpu(hdr->frame_control);
355 hdrlen = ieee80211_get_hdrlen(fc);
356 if (hdrlen > skb->len)
357 hdrlen = skb->len;
358 if (hdrlen >= 4)
359 printk(" FC=0x%04x DUR=0x%04x",
360 fc, le16_to_cpu(hdr->duration_id));
361 if (hdrlen >= 10)
362 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
363 if (hdrlen >= 16)
364 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
365 if (hdrlen >= 24)
366 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
367 if (hdrlen >= 30)
368 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
369 printk("\n");
370 }
371 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
372 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
373 struct sk_buff *skb)
374 {
375 }
376 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
377
378
379 static int ieee80211_is_eapol(const struct sk_buff *skb)
380 {
381 const struct ieee80211_hdr *hdr;
382 u16 fc;
383 int hdrlen;
384
385 if (unlikely(skb->len < 10))
386 return 0;
387
388 hdr = (const struct ieee80211_hdr *) skb->data;
389 fc = le16_to_cpu(hdr->frame_control);
390
391 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
392 return 0;
393
394 hdrlen = ieee80211_get_hdrlen(fc);
395
396 if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
397 memcmp(skb->data + hdrlen, eapol_header,
398 sizeof(eapol_header)) == 0))
399 return 1;
400
401 return 0;
402 }
403
404
405 static ieee80211_txrx_result
406 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
407 {
408 struct rate_control_extra extra;
409
410 memset(&extra, 0, sizeof(extra));
411 extra.mode = tx->u.tx.mode;
412 extra.mgmt_data = tx->sdata &&
413 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
414 extra.ethertype = tx->ethertype;
415
416 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
417 &extra);
418 if (unlikely(extra.probe != NULL)) {
419 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
420 tx->u.tx.probe_last_frag = 1;
421 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
422 tx->u.tx.rate = extra.probe;
423 } else {
424 tx->u.tx.control->alt_retry_rate = -1;
425 }
426 if (!tx->u.tx.rate)
427 return TXRX_DROP;
428 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
429 tx->local->cts_protect_erp_frames && tx->fragmented &&
430 extra.nonerp) {
431 tx->u.tx.last_frag_rate = tx->u.tx.rate;
432 tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
433
434 tx->u.tx.rate = extra.nonerp;
435 tx->u.tx.control->rate = extra.nonerp;
436 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
437 } else {
438 tx->u.tx.last_frag_rate = tx->u.tx.rate;
439 tx->u.tx.control->rate = tx->u.tx.rate;
440 }
441 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
442 if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
443 tx->local->short_preamble &&
444 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
445 tx->u.tx.short_preamble = 1;
446 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
447 }
448
449 return TXRX_CONTINUE;
450 }
451
452
453 static ieee80211_txrx_result
454 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
455 {
456 if (tx->sta)
457 tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
458 else
459 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
460
461 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
462 tx->key = NULL;
463 else if (tx->sta && tx->sta->key)
464 tx->key = tx->sta->key;
465 else if (tx->sdata->default_key)
466 tx->key = tx->sdata->default_key;
467 else if (tx->sdata->drop_unencrypted &&
468 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
469 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
470 return TXRX_DROP;
471 } else
472 tx->key = NULL;
473
474 if (tx->key) {
475 tx->key->tx_rx_count++;
476 if (unlikely(tx->local->key_tx_rx_threshold &&
477 tx->key->tx_rx_count >
478 tx->local->key_tx_rx_threshold)) {
479 ieee80211_key_threshold_notify(tx->dev, tx->key,
480 tx->sta);
481 }
482 }
483
484 return TXRX_CONTINUE;
485 }
486
487
488 static ieee80211_txrx_result
489 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
490 {
491 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
492 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
493 struct sk_buff **frags, *first, *frag;
494 int i;
495 u16 seq;
496 u8 *pos;
497 int frag_threshold = tx->local->fragmentation_threshold;
498
499 if (!tx->fragmented)
500 return TXRX_CONTINUE;
501
502 first = tx->skb;
503
504 hdrlen = ieee80211_get_hdrlen(tx->fc);
505 payload_len = first->len - hdrlen;
506 per_fragm = frag_threshold - hdrlen - FCS_LEN;
507 num_fragm = (payload_len + per_fragm - 1) / per_fragm;
508
509 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
510 if (!frags)
511 goto fail;
512
513 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
514 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
515 pos = first->data + hdrlen + per_fragm;
516 left = payload_len - per_fragm;
517 for (i = 0; i < num_fragm - 1; i++) {
518 struct ieee80211_hdr *fhdr;
519 size_t copylen;
520
521 if (left <= 0)
522 goto fail;
523
524 /* reserve enough extra head and tail room for possible
525 * encryption */
526 frag = frags[i] =
527 dev_alloc_skb(tx->local->hw.extra_tx_headroom +
528 frag_threshold +
529 IEEE80211_ENCRYPT_HEADROOM +
530 IEEE80211_ENCRYPT_TAILROOM);
531 if (!frag)
532 goto fail;
533 /* Make sure that all fragments use the same priority so
534 * that they end up using the same TX queue */
535 frag->priority = first->priority;
536 skb_reserve(frag, tx->local->hw.extra_tx_headroom +
537 IEEE80211_ENCRYPT_HEADROOM);
538 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
539 memcpy(fhdr, first->data, hdrlen);
540 if (i == num_fragm - 2)
541 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
542 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
543 copylen = left > per_fragm ? per_fragm : left;
544 memcpy(skb_put(frag, copylen), pos, copylen);
545
546 pos += copylen;
547 left -= copylen;
548 }
549 skb_trim(first, hdrlen + per_fragm);
550
551 tx->u.tx.num_extra_frag = num_fragm - 1;
552 tx->u.tx.extra_frag = frags;
553
554 return TXRX_CONTINUE;
555
556 fail:
557 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
558 if (frags) {
559 for (i = 0; i < num_fragm - 1; i++)
560 if (frags[i])
561 dev_kfree_skb(frags[i]);
562 kfree(frags);
563 }
564 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
565 return TXRX_DROP;
566 }
567
568
569 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
570 {
571 if (tx->key->force_sw_encrypt) {
572 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
573 return -1;
574 } else {
575 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
576 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
577 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
578 NULL)
579 return -1;
580 }
581 }
582 return 0;
583 }
584
585
586 void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
587 {
588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
589
590 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
591 if (tx->u.tx.extra_frag) {
592 struct ieee80211_hdr *fhdr;
593 int i;
594 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
595 fhdr = (struct ieee80211_hdr *)
596 tx->u.tx.extra_frag[i]->data;
597 fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
598 }
599 }
600 }
601
602
603 static ieee80211_txrx_result
604 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
605 {
606 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
607 u16 fc;
608
609 fc = le16_to_cpu(hdr->frame_control);
610
611 if (!tx->key || tx->key->alg != ALG_WEP ||
612 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
613 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
614 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
615 return TXRX_CONTINUE;
616
617 tx->u.tx.control->iv_len = WEP_IV_LEN;
618 tx->u.tx.control->icv_len = WEP_ICV_LEN;
619 ieee80211_tx_set_iswep(tx);
620
621 if (wep_encrypt_skb(tx, tx->skb) < 0) {
622 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
623 return TXRX_DROP;
624 }
625
626 if (tx->u.tx.extra_frag) {
627 int i;
628 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
629 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
630 I802_DEBUG_INC(tx->local->
631 tx_handlers_drop_wep);
632 return TXRX_DROP;
633 }
634 }
635 }
636
637 return TXRX_CONTINUE;
638 }
639
640
641 static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
642 int rate, int erp, int short_preamble)
643 {
644 int dur;
645
646 /* calculate duration (in microseconds, rounded up to next higher
647 * integer if it includes a fractional microsecond) to send frame of
648 * len bytes (does not include FCS) at the given rate. Duration will
649 * also include SIFS.
650 *
651 * rate is in 100 kbps, so divident is multiplied by 10 in the
652 * DIV_ROUND_UP() operations.
653 */
654
655 if (local->hw.conf.phymode == MODE_IEEE80211A || erp ||
656 local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
657 /*
658 * OFDM:
659 *
660 * N_DBPS = DATARATE x 4
661 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
662 * (16 = SIGNAL time, 6 = tail bits)
663 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
664 *
665 * T_SYM = 4 usec
666 * 802.11a - 17.5.2: aSIFSTime = 16 usec
667 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
668 * signal ext = 6 usec
669 */
670 /* FIX: Atheros Turbo may have different (shorter) duration? */
671 dur = 16; /* SIFS + signal ext */
672 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
673 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
674 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
675 4 * rate); /* T_SYM x N_SYM */
676 } else {
677 /*
678 * 802.11b or 802.11g with 802.11b compatibility:
679 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
680 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
681 *
682 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
683 * aSIFSTime = 10 usec
684 * aPreambleLength = 144 usec or 72 usec with short preamble
685 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
686 */
687 dur = 10; /* aSIFSTime = 10 usec */
688 dur += short_preamble ? (72 + 24) : (144 + 48);
689
690 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
691 }
692
693 return dur;
694 }
695
696
697 /* Exported duration function for driver use */
698 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
699 size_t frame_len, int rate)
700 {
701 struct ieee80211_local *local = hw_to_local(hw);
702 u16 dur;
703 int erp;
704
705 erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
706 dur = ieee80211_frame_duration(local, frame_len, rate,
707 erp, local->short_preamble);
708
709 return cpu_to_le16(dur);
710 }
711 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
712
713
714 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
715 int next_frag_len)
716 {
717 int rate, mrate, erp, dur, i;
718 struct ieee80211_rate *txrate = tx->u.tx.rate;
719 struct ieee80211_local *local = tx->local;
720 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
721
722 erp = txrate->flags & IEEE80211_RATE_ERP;
723
724 /*
725 * data and mgmt (except PS Poll):
726 * - during CFP: 32768
727 * - during contention period:
728 * if addr1 is group address: 0
729 * if more fragments = 0 and addr1 is individual address: time to
730 * transmit one ACK plus SIFS
731 * if more fragments = 1 and addr1 is individual address: time to
732 * transmit next fragment plus 2 x ACK plus 3 x SIFS
733 *
734 * IEEE 802.11, 9.6:
735 * - control response frame (CTS or ACK) shall be transmitted using the
736 * same rate as the immediately previous frame in the frame exchange
737 * sequence, if this rate belongs to the PHY mandatory rates, or else
738 * at the highest possible rate belonging to the PHY rates in the
739 * BSSBasicRateSet
740 */
741
742 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
743 /* TODO: These control frames are not currently sent by
744 * 80211.o, but should they be implemented, this function
745 * needs to be updated to support duration field calculation.
746 *
747 * RTS: time needed to transmit pending data/mgmt frame plus
748 * one CTS frame plus one ACK frame plus 3 x SIFS
749 * CTS: duration of immediately previous RTS minus time
750 * required to transmit CTS and its SIFS
751 * ACK: 0 if immediately previous directed data/mgmt had
752 * more=0, with more=1 duration in ACK frame is duration
753 * from previous frame minus time needed to transmit ACK
754 * and its SIFS
755 * PS Poll: BIT(15) | BIT(14) | aid
756 */
757 return 0;
758 }
759
760 /* data/mgmt */
761 if (0 /* FIX: data/mgmt during CFP */)
762 return 32768;
763
764 if (group_addr) /* Group address as the destination - no ACK */
765 return 0;
766
767 /* Individual destination address:
768 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
769 * CTS and ACK frames shall be transmitted using the highest rate in
770 * basic rate set that is less than or equal to the rate of the
771 * immediately previous frame and that is using the same modulation
772 * (CCK or OFDM). If no basic rate set matches with these requirements,
773 * the highest mandatory rate of the PHY that is less than or equal to
774 * the rate of the previous frame is used.
775 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
776 */
777 rate = -1;
778 mrate = 10; /* use 1 Mbps if everything fails */
779 for (i = 0; i < mode->num_rates; i++) {
780 struct ieee80211_rate *r = &mode->rates[i];
781 if (r->rate > txrate->rate)
782 break;
783
784 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
785 IEEE80211_RATE_MODULATION(r->flags))
786 continue;
787
788 if (r->flags & IEEE80211_RATE_BASIC)
789 rate = r->rate;
790 else if (r->flags & IEEE80211_RATE_MANDATORY)
791 mrate = r->rate;
792 }
793 if (rate == -1) {
794 /* No matching basic rate found; use highest suitable mandatory
795 * PHY rate */
796 rate = mrate;
797 }
798
799 /* Time needed to transmit ACK
800 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
801 * to closest integer */
802
803 dur = ieee80211_frame_duration(local, 10, rate, erp,
804 local->short_preamble);
805
806 if (next_frag_len) {
807 /* Frame is fragmented: duration increases with time needed to
808 * transmit next fragment plus ACK and 2 x SIFS. */
809 dur *= 2; /* ACK + SIFS */
810 /* next fragment */
811 dur += ieee80211_frame_duration(local, next_frag_len,
812 txrate->rate, erp,
813 local->short_preamble);
814 }
815
816 return dur;
817 }
818
819
820 static ieee80211_txrx_result
821 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
822 {
823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
824 u16 dur;
825 struct ieee80211_tx_control *control = tx->u.tx.control;
826 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
827
828 if (!is_multicast_ether_addr(hdr->addr1)) {
829 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
830 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
831 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
832 control->retry_limit =
833 tx->local->long_retry_limit;
834 } else {
835 control->retry_limit =
836 tx->local->short_retry_limit;
837 }
838 } else {
839 control->retry_limit = 1;
840 }
841
842 if (tx->fragmented) {
843 /* Do not use multiple retry rates when sending fragmented
844 * frames.
845 * TODO: The last fragment could still use multiple retry
846 * rates. */
847 control->alt_retry_rate = -1;
848 }
849
850 /* Use CTS protection for unicast frames sent using extended rates if
851 * there are associated non-ERP stations and RTS/CTS is not configured
852 * for the frame. */
853 if (mode->mode == MODE_IEEE80211G &&
854 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
855 tx->u.tx.unicast &&
856 tx->local->cts_protect_erp_frames &&
857 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
858 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
859
860 /* Setup duration field for the first fragment of the frame. Duration
861 * for remaining fragments will be updated when they are being sent
862 * to low-level driver in ieee80211_tx(). */
863 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
864 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
865 0);
866 hdr->duration_id = cpu_to_le16(dur);
867
868 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
869 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
870 struct ieee80211_rate *rate;
871
872 /* Do not use multiple retry rates when using RTS/CTS */
873 control->alt_retry_rate = -1;
874
875 /* Use min(data rate, max base rate) as CTS/RTS rate */
876 rate = tx->u.tx.rate;
877 while (rate > mode->rates &&
878 !(rate->flags & IEEE80211_RATE_BASIC))
879 rate--;
880
881 control->rts_cts_rate = rate->val;
882 control->rts_rate = rate;
883 }
884
885 if (tx->sta) {
886 tx->sta->tx_packets++;
887 tx->sta->tx_fragments++;
888 tx->sta->tx_bytes += tx->skb->len;
889 if (tx->u.tx.extra_frag) {
890 int i;
891 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
892 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
893 tx->sta->tx_bytes +=
894 tx->u.tx.extra_frag[i]->len;
895 }
896 }
897 }
898
899 return TXRX_CONTINUE;
900 }
901
902
903 static ieee80211_txrx_result
904 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
905 {
906 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
907 struct sk_buff *skb = tx->skb;
908 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
909 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
910 u32 sta_flags;
911
912 if (unlikely(tx->local->sta_scanning != 0) &&
913 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
914 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
915 return TXRX_DROP;
916
917 if (tx->u.tx.ps_buffered)
918 return TXRX_CONTINUE;
919
920 sta_flags = tx->sta ? tx->sta->flags : 0;
921
922 if (likely(tx->u.tx.unicast)) {
923 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
924 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
925 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
926 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
927 printk(KERN_DEBUG "%s: dropped data frame to not "
928 "associated station " MAC_FMT "\n",
929 tx->dev->name, MAC_ARG(hdr->addr1));
930 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
931 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
932 return TXRX_DROP;
933 }
934 } else {
935 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
936 tx->local->num_sta == 0 &&
937 !tx->local->allow_broadcast_always &&
938 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
939 /*
940 * No associated STAs - no need to send multicast
941 * frames.
942 */
943 return TXRX_DROP;
944 }
945 return TXRX_CONTINUE;
946 }
947
948 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
949 !(sta_flags & WLAN_STA_AUTHORIZED))) {
950 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
951 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
952 " (unauthorized port)\n", tx->dev->name,
953 MAC_ARG(hdr->addr1));
954 #endif
955 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
956 return TXRX_DROP;
957 }
958
959 return TXRX_CONTINUE;
960 }
961
962 static ieee80211_txrx_result
963 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
964 {
965 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
966
967 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
968 ieee80211_include_sequence(tx->sdata, hdr);
969
970 return TXRX_CONTINUE;
971 }
972
973 /* This function is called whenever the AP is about to exceed the maximum limit
974 * of buffered frames for power saving STAs. This situation should not really
975 * happen often during normal operation, so dropping the oldest buffered packet
976 * from each queue should be OK to make some room for new frames. */
977 static void purge_old_ps_buffers(struct ieee80211_local *local)
978 {
979 int total = 0, purged = 0;
980 struct sk_buff *skb;
981 struct ieee80211_sub_if_data *sdata;
982 struct sta_info *sta;
983
984 read_lock(&local->sub_if_lock);
985 list_for_each_entry(sdata, &local->sub_if_list, list) {
986 struct ieee80211_if_ap *ap;
987 if (sdata->dev == local->mdev ||
988 sdata->type != IEEE80211_IF_TYPE_AP)
989 continue;
990 ap = &sdata->u.ap;
991 skb = skb_dequeue(&ap->ps_bc_buf);
992 if (skb) {
993 purged++;
994 dev_kfree_skb(skb);
995 }
996 total += skb_queue_len(&ap->ps_bc_buf);
997 }
998 read_unlock(&local->sub_if_lock);
999
1000 spin_lock_bh(&local->sta_lock);
1001 list_for_each_entry(sta, &local->sta_list, list) {
1002 skb = skb_dequeue(&sta->ps_tx_buf);
1003 if (skb) {
1004 purged++;
1005 dev_kfree_skb(skb);
1006 }
1007 total += skb_queue_len(&sta->ps_tx_buf);
1008 }
1009 spin_unlock_bh(&local->sta_lock);
1010
1011 local->total_ps_buffered = total;
1012 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
1013 local->mdev->name, purged);
1014 }
1015
1016
1017 static inline ieee80211_txrx_result
1018 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
1019 {
1020 /* broadcast/multicast frame */
1021 /* If any of the associated stations is in power save mode,
1022 * the frame is buffered to be sent after DTIM beacon frame */
1023 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
1024 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
1025 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
1026 !(tx->fc & IEEE80211_FCTL_ORDER)) {
1027 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1028 purge_old_ps_buffers(tx->local);
1029 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
1030 AP_MAX_BC_BUFFER) {
1031 if (net_ratelimit()) {
1032 printk(KERN_DEBUG "%s: BC TX buffer full - "
1033 "dropping the oldest frame\n",
1034 tx->dev->name);
1035 }
1036 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
1037 } else
1038 tx->local->total_ps_buffered++;
1039 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
1040 return TXRX_QUEUED;
1041 }
1042
1043 return TXRX_CONTINUE;
1044 }
1045
1046
1047 static inline ieee80211_txrx_result
1048 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
1049 {
1050 struct sta_info *sta = tx->sta;
1051
1052 if (unlikely(!sta ||
1053 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1054 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
1055 return TXRX_CONTINUE;
1056
1057 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
1058 struct ieee80211_tx_packet_data *pkt_data;
1059 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1060 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
1061 "before %d)\n",
1062 MAC_ARG(sta->addr), sta->aid,
1063 skb_queue_len(&sta->ps_tx_buf));
1064 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1065 sta->flags |= WLAN_STA_TIM;
1066 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1067 purge_old_ps_buffers(tx->local);
1068 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
1069 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
1070 if (net_ratelimit()) {
1071 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
1072 "buffer full - dropping oldest frame\n",
1073 tx->dev->name, MAC_ARG(sta->addr));
1074 }
1075 dev_kfree_skb(old);
1076 } else
1077 tx->local->total_ps_buffered++;
1078 /* Queue frame to be sent after STA sends an PS Poll frame */
1079 if (skb_queue_empty(&sta->ps_tx_buf)) {
1080 if (tx->local->ops->set_tim)
1081 tx->local->ops->set_tim(local_to_hw(tx->local),
1082 sta->aid, 1);
1083 if (tx->sdata->bss)
1084 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
1085 }
1086 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
1087 pkt_data->jiffies = jiffies;
1088 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
1089 return TXRX_QUEUED;
1090 }
1091 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1092 else if (unlikely(sta->flags & WLAN_STA_PS)) {
1093 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
1094 "set -> send frame\n", tx->dev->name,
1095 MAC_ARG(sta->addr));
1096 }
1097 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1098 sta->pspoll = 0;
1099
1100 return TXRX_CONTINUE;
1101 }
1102
1103
1104 static ieee80211_txrx_result
1105 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
1106 {
1107 if (unlikely(tx->u.tx.ps_buffered))
1108 return TXRX_CONTINUE;
1109
1110 if (tx->u.tx.unicast)
1111 return ieee80211_tx_h_unicast_ps_buf(tx);
1112 else
1113 return ieee80211_tx_h_multicast_ps_buf(tx);
1114 }
1115
1116
1117 static void inline
1118 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1119 struct sk_buff *skb,
1120 struct net_device *dev,
1121 struct ieee80211_tx_control *control)
1122 {
1123 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1124 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1125 int hdrlen;
1126
1127 memset(tx, 0, sizeof(*tx));
1128 tx->skb = skb;
1129 tx->dev = dev; /* use original interface */
1130 tx->local = local;
1131 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1132 tx->sta = sta_info_get(local, hdr->addr1);
1133 tx->fc = le16_to_cpu(hdr->frame_control);
1134 control->power_level = local->hw.conf.power_level;
1135 tx->u.tx.control = control;
1136 tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
1137 if (is_multicast_ether_addr(hdr->addr1))
1138 control->flags |= IEEE80211_TXCTL_NO_ACK;
1139 else
1140 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1141 tx->fragmented = local->fragmentation_threshold <
1142 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
1143 skb->len + FCS_LEN > local->fragmentation_threshold &&
1144 (!local->ops->set_frag_threshold);
1145 if (!tx->sta)
1146 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1147 else if (tx->sta->clear_dst_mask) {
1148 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1149 tx->sta->clear_dst_mask = 0;
1150 }
1151 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1152 if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
1153 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
1154 hdrlen = ieee80211_get_hdrlen(tx->fc);
1155 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1156 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1157 tx->ethertype = (pos[0] << 8) | pos[1];
1158 }
1159 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1160
1161 }
1162
1163 static int inline is_ieee80211_device(struct net_device *dev,
1164 struct net_device *master)
1165 {
1166 return (wdev_priv(dev->ieee80211_ptr) ==
1167 wdev_priv(master->ieee80211_ptr));
1168 }
1169
1170 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1171 * finished with it. */
1172 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1173 struct sk_buff *skb,
1174 struct net_device *mdev,
1175 struct ieee80211_tx_control *control)
1176 {
1177 struct ieee80211_tx_packet_data *pkt_data;
1178 struct net_device *dev;
1179
1180 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1181 dev = dev_get_by_index(pkt_data->ifindex);
1182 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1183 dev_put(dev);
1184 dev = NULL;
1185 }
1186 if (unlikely(!dev))
1187 return -ENODEV;
1188 __ieee80211_tx_prepare(tx, skb, dev, control);
1189 return 0;
1190 }
1191
1192 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
1193 int queue)
1194 {
1195 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
1196 }
1197
1198 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
1199 int queue)
1200 {
1201 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
1202 }
1203
1204 #define IEEE80211_TX_OK 0
1205 #define IEEE80211_TX_AGAIN 1
1206 #define IEEE80211_TX_FRAG_AGAIN 2
1207
1208 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1209 struct ieee80211_txrx_data *tx)
1210 {
1211 struct ieee80211_tx_control *control = tx->u.tx.control;
1212 int ret, i;
1213
1214 if (!ieee80211_qdisc_installed(local->mdev) &&
1215 __ieee80211_queue_stopped(local, 0)) {
1216 netif_stop_queue(local->mdev);
1217 return IEEE80211_TX_AGAIN;
1218 }
1219 if (skb) {
1220 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1221 ret = local->ops->tx(local_to_hw(local), skb, control);
1222 if (ret)
1223 return IEEE80211_TX_AGAIN;
1224 local->mdev->trans_start = jiffies;
1225 ieee80211_led_tx(local, 1);
1226 }
1227 if (tx->u.tx.extra_frag) {
1228 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1229 IEEE80211_TXCTL_USE_CTS_PROTECT |
1230 IEEE80211_TXCTL_CLEAR_DST_MASK |
1231 IEEE80211_TXCTL_FIRST_FRAGMENT);
1232 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1233 if (!tx->u.tx.extra_frag[i])
1234 continue;
1235 if (__ieee80211_queue_stopped(local, control->queue))
1236 return IEEE80211_TX_FRAG_AGAIN;
1237 if (i == tx->u.tx.num_extra_frag) {
1238 control->tx_rate = tx->u.tx.last_frag_hwrate;
1239 control->rate = tx->u.tx.last_frag_rate;
1240 if (tx->u.tx.probe_last_frag)
1241 control->flags |=
1242 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1243 else
1244 control->flags &=
1245 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1246 }
1247
1248 ieee80211_dump_frame(local->mdev->name,
1249 "TX to low-level driver",
1250 tx->u.tx.extra_frag[i]);
1251 ret = local->ops->tx(local_to_hw(local),
1252 tx->u.tx.extra_frag[i],
1253 control);
1254 if (ret)
1255 return IEEE80211_TX_FRAG_AGAIN;
1256 local->mdev->trans_start = jiffies;
1257 ieee80211_led_tx(local, 1);
1258 tx->u.tx.extra_frag[i] = NULL;
1259 }
1260 kfree(tx->u.tx.extra_frag);
1261 tx->u.tx.extra_frag = NULL;
1262 }
1263 return IEEE80211_TX_OK;
1264 }
1265
1266 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1267 struct ieee80211_tx_control *control, int mgmt)
1268 {
1269 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1270 struct sta_info *sta;
1271 ieee80211_tx_handler *handler;
1272 struct ieee80211_txrx_data tx;
1273 ieee80211_txrx_result res = TXRX_DROP;
1274 int ret, i;
1275
1276 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1277
1278 if (unlikely(skb->len < 10)) {
1279 dev_kfree_skb(skb);
1280 return 0;
1281 }
1282
1283 __ieee80211_tx_prepare(&tx, skb, dev, control);
1284 sta = tx.sta;
1285 tx.u.tx.mgmt_interface = mgmt;
1286 tx.u.tx.mode = local->hw.conf.mode;
1287
1288 for (handler = local->tx_handlers; *handler != NULL; handler++) {
1289 res = (*handler)(&tx);
1290 if (res != TXRX_CONTINUE)
1291 break;
1292 }
1293
1294 skb = tx.skb; /* handlers are allowed to change skb */
1295
1296 if (sta)
1297 sta_info_put(sta);
1298
1299 if (unlikely(res == TXRX_DROP)) {
1300 I802_DEBUG_INC(local->tx_handlers_drop);
1301 goto drop;
1302 }
1303
1304 if (unlikely(res == TXRX_QUEUED)) {
1305 I802_DEBUG_INC(local->tx_handlers_queued);
1306 return 0;
1307 }
1308
1309 if (tx.u.tx.extra_frag) {
1310 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1311 int next_len, dur;
1312 struct ieee80211_hdr *hdr =
1313 (struct ieee80211_hdr *)
1314 tx.u.tx.extra_frag[i]->data;
1315
1316 if (i + 1 < tx.u.tx.num_extra_frag) {
1317 next_len = tx.u.tx.extra_frag[i + 1]->len;
1318 } else {
1319 next_len = 0;
1320 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1321 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1322 }
1323 dur = ieee80211_duration(&tx, 0, next_len);
1324 hdr->duration_id = cpu_to_le16(dur);
1325 }
1326 }
1327
1328 retry:
1329 ret = __ieee80211_tx(local, skb, &tx);
1330 if (ret) {
1331 struct ieee80211_tx_stored_packet *store =
1332 &local->pending_packet[control->queue];
1333
1334 if (ret == IEEE80211_TX_FRAG_AGAIN)
1335 skb = NULL;
1336 set_bit(IEEE80211_LINK_STATE_PENDING,
1337 &local->state[control->queue]);
1338 smp_mb();
1339 /* When the driver gets out of buffers during sending of
1340 * fragments and calls ieee80211_stop_queue, there is
1341 * a small window between IEEE80211_LINK_STATE_XOFF and
1342 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1343 * gets available in that window (i.e. driver calls
1344 * ieee80211_wake_queue), we would end up with ieee80211_tx
1345 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1346 * continuing transmitting here when that situation is
1347 * possible to have happened. */
1348 if (!__ieee80211_queue_stopped(local, control->queue)) {
1349 clear_bit(IEEE80211_LINK_STATE_PENDING,
1350 &local->state[control->queue]);
1351 goto retry;
1352 }
1353 memcpy(&store->control, control,
1354 sizeof(struct ieee80211_tx_control));
1355 store->skb = skb;
1356 store->extra_frag = tx.u.tx.extra_frag;
1357 store->num_extra_frag = tx.u.tx.num_extra_frag;
1358 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1359 store->last_frag_rate = tx.u.tx.last_frag_rate;
1360 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1361 }
1362 return 0;
1363
1364 drop:
1365 if (skb)
1366 dev_kfree_skb(skb);
1367 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1368 if (tx.u.tx.extra_frag[i])
1369 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1370 kfree(tx.u.tx.extra_frag);
1371 return 0;
1372 }
1373
1374 static void ieee80211_tx_pending(unsigned long data)
1375 {
1376 struct ieee80211_local *local = (struct ieee80211_local *)data;
1377 struct net_device *dev = local->mdev;
1378 struct ieee80211_tx_stored_packet *store;
1379 struct ieee80211_txrx_data tx;
1380 int i, ret, reschedule = 0;
1381
1382 netif_tx_lock_bh(dev);
1383 for (i = 0; i < local->hw.queues; i++) {
1384 if (__ieee80211_queue_stopped(local, i))
1385 continue;
1386 if (!__ieee80211_queue_pending(local, i)) {
1387 reschedule = 1;
1388 continue;
1389 }
1390 store = &local->pending_packet[i];
1391 tx.u.tx.control = &store->control;
1392 tx.u.tx.extra_frag = store->extra_frag;
1393 tx.u.tx.num_extra_frag = store->num_extra_frag;
1394 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1395 tx.u.tx.last_frag_rate = store->last_frag_rate;
1396 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1397 ret = __ieee80211_tx(local, store->skb, &tx);
1398 if (ret) {
1399 if (ret == IEEE80211_TX_FRAG_AGAIN)
1400 store->skb = NULL;
1401 } else {
1402 clear_bit(IEEE80211_LINK_STATE_PENDING,
1403 &local->state[i]);
1404 reschedule = 1;
1405 }
1406 }
1407 netif_tx_unlock_bh(dev);
1408 if (reschedule) {
1409 if (!ieee80211_qdisc_installed(dev)) {
1410 if (!__ieee80211_queue_stopped(local, 0))
1411 netif_wake_queue(dev);
1412 } else
1413 netif_schedule(dev);
1414 }
1415 }
1416
1417 static void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1418 {
1419 int i, j;
1420 struct ieee80211_tx_stored_packet *store;
1421
1422 for (i = 0; i < local->hw.queues; i++) {
1423 if (!__ieee80211_queue_pending(local, i))
1424 continue;
1425 store = &local->pending_packet[i];
1426 kfree_skb(store->skb);
1427 for (j = 0; j < store->num_extra_frag; j++)
1428 kfree_skb(store->extra_frag[j]);
1429 kfree(store->extra_frag);
1430 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1431 }
1432 }
1433
1434 static int ieee80211_master_start_xmit(struct sk_buff *skb,
1435 struct net_device *dev)
1436 {
1437 struct ieee80211_tx_control control;
1438 struct ieee80211_tx_packet_data *pkt_data;
1439 struct net_device *odev = NULL;
1440 struct ieee80211_sub_if_data *osdata;
1441 int headroom;
1442 int ret;
1443
1444 /*
1445 * copy control out of the skb so other people can use skb->cb
1446 */
1447 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1448 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1449
1450 if (pkt_data->ifindex)
1451 odev = dev_get_by_index(pkt_data->ifindex);
1452 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1453 dev_put(odev);
1454 odev = NULL;
1455 }
1456 if (unlikely(!odev)) {
1457 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1458 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1459 "originating device\n", dev->name);
1460 #endif
1461 dev_kfree_skb(skb);
1462 return 0;
1463 }
1464 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1465
1466 headroom = osdata->local->hw.extra_tx_headroom +
1467 IEEE80211_ENCRYPT_HEADROOM;
1468 if (skb_headroom(skb) < headroom) {
1469 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1470 dev_kfree_skb(skb);
1471 return 0;
1472 }
1473 }
1474
1475 control.ifindex = odev->ifindex;
1476 control.type = osdata->type;
1477 if (pkt_data->req_tx_status)
1478 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1479 if (pkt_data->do_not_encrypt)
1480 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1481 if (pkt_data->requeue)
1482 control.flags |= IEEE80211_TXCTL_REQUEUE;
1483 control.queue = pkt_data->queue;
1484
1485 ret = ieee80211_tx(odev, skb, &control,
1486 control.type == IEEE80211_IF_TYPE_MGMT);
1487 dev_put(odev);
1488
1489 return ret;
1490 }
1491
1492
1493 /**
1494 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1495 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1496 * @skb: packet to be sent
1497 * @dev: incoming interface
1498 *
1499 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1500 * not be freed, and caller is responsible for either retrying later or freeing
1501 * skb).
1502 *
1503 * This function takes in an Ethernet header and encapsulates it with suitable
1504 * IEEE 802.11 header based on which interface the packet is coming in. The
1505 * encapsulated packet will then be passed to master interface, wlan#.11, for
1506 * transmission (through low-level driver).
1507 */
1508 static int ieee80211_subif_start_xmit(struct sk_buff *skb,
1509 struct net_device *dev)
1510 {
1511 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1512 struct ieee80211_tx_packet_data *pkt_data;
1513 struct ieee80211_sub_if_data *sdata;
1514 int ret = 1, head_need;
1515 u16 ethertype, hdrlen, fc;
1516 struct ieee80211_hdr hdr;
1517 const u8 *encaps_data;
1518 int encaps_len, skip_header_bytes;
1519 int nh_pos, h_pos, no_encrypt = 0;
1520 struct sta_info *sta;
1521
1522 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1523 if (unlikely(skb->len < ETH_HLEN)) {
1524 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1525 dev->name, skb->len);
1526 ret = 0;
1527 goto fail;
1528 }
1529
1530 nh_pos = skb_network_header(skb) - skb->data;
1531 h_pos = skb_transport_header(skb) - skb->data;
1532
1533 /* convert Ethernet header to proper 802.11 header (based on
1534 * operation mode) */
1535 ethertype = (skb->data[12] << 8) | skb->data[13];
1536 /* TODO: handling for 802.1x authorized/unauthorized port */
1537 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1538
1539 if (likely(sdata->type == IEEE80211_IF_TYPE_AP ||
1540 sdata->type == IEEE80211_IF_TYPE_VLAN)) {
1541 fc |= IEEE80211_FCTL_FROMDS;
1542 /* DA BSSID SA */
1543 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1544 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1545 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1546 hdrlen = 24;
1547 } else if (sdata->type == IEEE80211_IF_TYPE_WDS) {
1548 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1549 /* RA TA DA SA */
1550 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1551 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1552 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1553 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1554 hdrlen = 30;
1555 } else if (sdata->type == IEEE80211_IF_TYPE_STA) {
1556 fc |= IEEE80211_FCTL_TODS;
1557 /* BSSID SA DA */
1558 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1559 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1560 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1561 hdrlen = 24;
1562 } else if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
1563 /* DA SA BSSID */
1564 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1565 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1566 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1567 hdrlen = 24;
1568 } else {
1569 ret = 0;
1570 goto fail;
1571 }
1572
1573 /* receiver is QoS enabled, use a QoS type frame */
1574 sta = sta_info_get(local, hdr.addr1);
1575 if (sta) {
1576 if (sta->flags & WLAN_STA_WME) {
1577 fc |= IEEE80211_STYPE_QOS_DATA;
1578 hdrlen += 2;
1579 }
1580 sta_info_put(sta);
1581 }
1582
1583 hdr.frame_control = cpu_to_le16(fc);
1584 hdr.duration_id = 0;
1585 hdr.seq_ctrl = 0;
1586
1587 skip_header_bytes = ETH_HLEN;
1588 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1589 encaps_data = bridge_tunnel_header;
1590 encaps_len = sizeof(bridge_tunnel_header);
1591 skip_header_bytes -= 2;
1592 } else if (ethertype >= 0x600) {
1593 encaps_data = rfc1042_header;
1594 encaps_len = sizeof(rfc1042_header);
1595 skip_header_bytes -= 2;
1596 } else {
1597 encaps_data = NULL;
1598 encaps_len = 0;
1599 }
1600
1601 skb_pull(skb, skip_header_bytes);
1602 nh_pos -= skip_header_bytes;
1603 h_pos -= skip_header_bytes;
1604
1605 /* TODO: implement support for fragments so that there is no need to
1606 * reallocate and copy payload; it might be enough to support one
1607 * extra fragment that would be copied in the beginning of the frame
1608 * data.. anyway, it would be nice to include this into skb structure
1609 * somehow
1610 *
1611 * There are few options for this:
1612 * use skb->cb as an extra space for 802.11 header
1613 * allocate new buffer if not enough headroom
1614 * make sure that there is enough headroom in every skb by increasing
1615 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1616 * alloc_skb() (net/core/skbuff.c)
1617 */
1618 head_need = hdrlen + encaps_len + local->hw.extra_tx_headroom;
1619 head_need -= skb_headroom(skb);
1620
1621 /* We are going to modify skb data, so make a copy of it if happens to
1622 * be cloned. This could happen, e.g., with Linux bridge code passing
1623 * us broadcast frames. */
1624
1625 if (head_need > 0 || skb_cloned(skb)) {
1626 #if 0
1627 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1628 "of headroom\n", dev->name, head_need);
1629 #endif
1630
1631 if (skb_cloned(skb))
1632 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1633 else
1634 I802_DEBUG_INC(local->tx_expand_skb_head);
1635 /* Since we have to reallocate the buffer, make sure that there
1636 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1637 * before payload and 12 after). */
1638 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1639 12, GFP_ATOMIC)) {
1640 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1641 "\n", dev->name);
1642 goto fail;
1643 }
1644 }
1645
1646 if (encaps_data) {
1647 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1648 nh_pos += encaps_len;
1649 h_pos += encaps_len;
1650 }
1651 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1652 nh_pos += hdrlen;
1653 h_pos += hdrlen;
1654
1655 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1656 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1657 pkt_data->ifindex = sdata->dev->ifindex;
1658 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1659 pkt_data->do_not_encrypt = no_encrypt;
1660
1661 skb->dev = local->mdev;
1662 sdata->stats.tx_packets++;
1663 sdata->stats.tx_bytes += skb->len;
1664
1665 /* Update skb pointers to various headers since this modified frame
1666 * is going to go through Linux networking code that may potentially
1667 * need things like pointer to IP header. */
1668 skb_set_mac_header(skb, 0);
1669 skb_set_network_header(skb, nh_pos);
1670 skb_set_transport_header(skb, h_pos);
1671
1672 dev->trans_start = jiffies;
1673 dev_queue_xmit(skb);
1674
1675 return 0;
1676
1677 fail:
1678 if (!ret)
1679 dev_kfree_skb(skb);
1680
1681 return ret;
1682 }
1683
1684
1685 /*
1686 * This is the transmit routine for the 802.11 type interfaces
1687 * called by upper layers of the linux networking
1688 * stack when it has a frame to transmit
1689 */
1690 static int
1691 ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1692 {
1693 struct ieee80211_sub_if_data *sdata;
1694 struct ieee80211_tx_packet_data *pkt_data;
1695 struct ieee80211_hdr *hdr;
1696 u16 fc;
1697
1698 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1699
1700 if (skb->len < 10) {
1701 dev_kfree_skb(skb);
1702 return 0;
1703 }
1704
1705 if (skb_headroom(skb) < sdata->local->hw.extra_tx_headroom) {
1706 if (pskb_expand_head(skb,
1707 sdata->local->hw.extra_tx_headroom, 0, GFP_ATOMIC)) {
1708 dev_kfree_skb(skb);
1709 return 0;
1710 }
1711 }
1712
1713 hdr = (struct ieee80211_hdr *) skb->data;
1714 fc = le16_to_cpu(hdr->frame_control);
1715
1716 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1717 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1718 pkt_data->ifindex = sdata->dev->ifindex;
1719 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1720
1721 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1722 skb->dev = sdata->local->mdev;
1723
1724 /*
1725 * We're using the protocol field of the the frame control header
1726 * to request TX callback for hostapd. BIT(1) is checked.
1727 */
1728 if ((fc & BIT(1)) == BIT(1)) {
1729 pkt_data->req_tx_status = 1;
1730 fc &= ~BIT(1);
1731 hdr->frame_control = cpu_to_le16(fc);
1732 }
1733
1734 pkt_data->do_not_encrypt = !(fc & IEEE80211_FCTL_PROTECTED);
1735
1736 sdata->stats.tx_packets++;
1737 sdata->stats.tx_bytes += skb->len;
1738
1739 dev_queue_xmit(skb);
1740
1741 return 0;
1742 }
1743
1744
1745 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1746 struct ieee80211_if_ap *bss,
1747 struct sk_buff *skb)
1748 {
1749 u8 *pos, *tim;
1750 int aid0 = 0;
1751 int i, have_bits = 0, n1, n2;
1752
1753 /* Generate bitmap for TIM only if there are any STAs in power save
1754 * mode. */
1755 spin_lock_bh(&local->sta_lock);
1756 if (atomic_read(&bss->num_sta_ps) > 0)
1757 /* in the hope that this is faster than
1758 * checking byte-for-byte */
1759 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1760 IEEE80211_MAX_AID+1);
1761
1762 if (bss->dtim_count == 0)
1763 bss->dtim_count = bss->dtim_period - 1;
1764 else
1765 bss->dtim_count--;
1766
1767 tim = pos = (u8 *) skb_put(skb, 6);
1768 *pos++ = WLAN_EID_TIM;
1769 *pos++ = 4;
1770 *pos++ = bss->dtim_count;
1771 *pos++ = bss->dtim_period;
1772
1773 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
1774 aid0 = 1;
1775
1776 if (have_bits) {
1777 /* Find largest even number N1 so that bits numbered 1 through
1778 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
1779 * (N2 + 1) x 8 through 2007 are 0. */
1780 n1 = 0;
1781 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
1782 if (bss->tim[i]) {
1783 n1 = i & 0xfe;
1784 break;
1785 }
1786 }
1787 n2 = n1;
1788 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
1789 if (bss->tim[i]) {
1790 n2 = i;
1791 break;
1792 }
1793 }
1794
1795 /* Bitmap control */
1796 *pos++ = n1 | aid0;
1797 /* Part Virt Bitmap */
1798 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
1799
1800 tim[1] = n2 - n1 + 4;
1801 skb_put(skb, n2 - n1);
1802 } else {
1803 *pos++ = aid0; /* Bitmap control */
1804 *pos++ = 0; /* Part Virt Bitmap */
1805 }
1806 spin_unlock_bh(&local->sta_lock);
1807 }
1808
1809
1810 struct sk_buff * ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
1811 struct ieee80211_tx_control *control)
1812 {
1813 struct ieee80211_local *local = hw_to_local(hw);
1814 struct sk_buff *skb;
1815 struct net_device *bdev;
1816 struct ieee80211_sub_if_data *sdata = NULL;
1817 struct ieee80211_if_ap *ap = NULL;
1818 struct ieee80211_rate *rate;
1819 struct rate_control_extra extra;
1820 u8 *b_head, *b_tail;
1821 int bh_len, bt_len;
1822
1823 bdev = dev_get_by_index(if_id);
1824 if (bdev) {
1825 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1826 ap = &sdata->u.ap;
1827 dev_put(bdev);
1828 }
1829
1830 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
1831 !ap->beacon_head) {
1832 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1833 if (net_ratelimit())
1834 printk(KERN_DEBUG "no beacon data avail for idx=%d "
1835 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
1836 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
1837 return NULL;
1838 }
1839
1840 /* Assume we are generating the normal beacon locally */
1841 b_head = ap->beacon_head;
1842 b_tail = ap->beacon_tail;
1843 bh_len = ap->beacon_head_len;
1844 bt_len = ap->beacon_tail_len;
1845
1846 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1847 bh_len + bt_len + 256 /* maximum TIM len */);
1848 if (!skb)
1849 return NULL;
1850
1851 skb_reserve(skb, local->hw.extra_tx_headroom);
1852 memcpy(skb_put(skb, bh_len), b_head, bh_len);
1853
1854 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
1855
1856 ieee80211_beacon_add_tim(local, ap, skb);
1857
1858 if (b_tail) {
1859 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
1860 }
1861
1862 if (control) {
1863 memset(&extra, 0, sizeof(extra));
1864 extra.mode = local->oper_hw_mode;
1865
1866 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
1867 if (!rate) {
1868 if (net_ratelimit()) {
1869 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
1870 "found\n", local->mdev->name);
1871 }
1872 dev_kfree_skb(skb);
1873 return NULL;
1874 }
1875
1876 control->tx_rate = (local->short_preamble &&
1877 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
1878 rate->val2 : rate->val;
1879 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1880 control->power_level = local->hw.conf.power_level;
1881 control->flags |= IEEE80211_TXCTL_NO_ACK;
1882 control->retry_limit = 1;
1883 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1884 }
1885
1886 ap->num_beacons++;
1887 return skb;
1888 }
1889 EXPORT_SYMBOL(ieee80211_beacon_get);
1890
1891 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
1892 size_t frame_len,
1893 const struct ieee80211_tx_control *frame_txctl)
1894 {
1895 struct ieee80211_local *local = hw_to_local(hw);
1896 struct ieee80211_rate *rate;
1897 int short_preamble = local->short_preamble;
1898 int erp;
1899 u16 dur;
1900
1901 rate = frame_txctl->rts_rate;
1902 erp = !!(rate->flags & IEEE80211_RATE_ERP);
1903
1904 /* CTS duration */
1905 dur = ieee80211_frame_duration(local, 10, rate->rate,
1906 erp, short_preamble);
1907 /* Data frame duration */
1908 dur += ieee80211_frame_duration(local, frame_len, rate->rate,
1909 erp, short_preamble);
1910 /* ACK duration */
1911 dur += ieee80211_frame_duration(local, 10, rate->rate,
1912 erp, short_preamble);
1913
1914 return cpu_to_le16(dur);
1915 }
1916 EXPORT_SYMBOL(ieee80211_rts_duration);
1917
1918
1919 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
1920 size_t frame_len,
1921 const struct ieee80211_tx_control *frame_txctl)
1922 {
1923 struct ieee80211_local *local = hw_to_local(hw);
1924 struct ieee80211_rate *rate;
1925 int short_preamble = local->short_preamble;
1926 int erp;
1927 u16 dur;
1928
1929 rate = frame_txctl->rts_rate;
1930 erp = !!(rate->flags & IEEE80211_RATE_ERP);
1931
1932 /* Data frame duration */
1933 dur = ieee80211_frame_duration(local, frame_len, rate->rate,
1934 erp, short_preamble);
1935 if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
1936 /* ACK duration */
1937 dur += ieee80211_frame_duration(local, 10, rate->rate,
1938 erp, short_preamble);
1939 }
1940
1941 return cpu_to_le16(dur);
1942 }
1943 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
1944
1945 void ieee80211_rts_get(struct ieee80211_hw *hw,
1946 const void *frame, size_t frame_len,
1947 const struct ieee80211_tx_control *frame_txctl,
1948 struct ieee80211_rts *rts)
1949 {
1950 const struct ieee80211_hdr *hdr = frame;
1951 u16 fctl;
1952
1953 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
1954 rts->frame_control = cpu_to_le16(fctl);
1955 rts->duration = ieee80211_rts_duration(hw, frame_len, frame_txctl);
1956 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
1957 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
1958 }
1959 EXPORT_SYMBOL(ieee80211_rts_get);
1960
1961 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
1962 const void *frame, size_t frame_len,
1963 const struct ieee80211_tx_control *frame_txctl,
1964 struct ieee80211_cts *cts)
1965 {
1966 const struct ieee80211_hdr *hdr = frame;
1967 u16 fctl;
1968
1969 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
1970 cts->frame_control = cpu_to_le16(fctl);
1971 cts->duration = ieee80211_ctstoself_duration(hw, frame_len, frame_txctl);
1972 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
1973 }
1974 EXPORT_SYMBOL(ieee80211_ctstoself_get);
1975
1976 struct sk_buff *
1977 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
1978 struct ieee80211_tx_control *control)
1979 {
1980 struct ieee80211_local *local = hw_to_local(hw);
1981 struct sk_buff *skb;
1982 struct sta_info *sta;
1983 ieee80211_tx_handler *handler;
1984 struct ieee80211_txrx_data tx;
1985 ieee80211_txrx_result res = TXRX_DROP;
1986 struct net_device *bdev;
1987 struct ieee80211_sub_if_data *sdata;
1988 struct ieee80211_if_ap *bss = NULL;
1989
1990 bdev = dev_get_by_index(if_id);
1991 if (bdev) {
1992 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
1993 bss = &sdata->u.ap;
1994 dev_put(bdev);
1995 }
1996 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
1997 return NULL;
1998
1999 if (bss->dtim_count != 0)
2000 return NULL; /* send buffered bc/mc only after DTIM beacon */
2001 memset(control, 0, sizeof(*control));
2002 while (1) {
2003 skb = skb_dequeue(&bss->ps_bc_buf);
2004 if (!skb)
2005 return NULL;
2006 local->total_ps_buffered--;
2007
2008 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2009 struct ieee80211_hdr *hdr =
2010 (struct ieee80211_hdr *) skb->data;
2011 /* more buffered multicast/broadcast frames ==> set
2012 * MoreData flag in IEEE 802.11 header to inform PS
2013 * STAs */
2014 hdr->frame_control |=
2015 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2016 }
2017
2018 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
2019 break;
2020 dev_kfree_skb_any(skb);
2021 }
2022 sta = tx.sta;
2023 tx.u.tx.ps_buffered = 1;
2024
2025 for (handler = local->tx_handlers; *handler != NULL; handler++) {
2026 res = (*handler)(&tx);
2027 if (res == TXRX_DROP || res == TXRX_QUEUED)
2028 break;
2029 }
2030 dev_put(tx.dev);
2031 skb = tx.skb; /* handlers are allowed to change skb */
2032
2033 if (res == TXRX_DROP) {
2034 I802_DEBUG_INC(local->tx_handlers_drop);
2035 dev_kfree_skb(skb);
2036 skb = NULL;
2037 } else if (res == TXRX_QUEUED) {
2038 I802_DEBUG_INC(local->tx_handlers_queued);
2039 skb = NULL;
2040 }
2041
2042 if (sta)
2043 sta_info_put(sta);
2044
2045 return skb;
2046 }
2047 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2048
2049 static int __ieee80211_if_config(struct net_device *dev,
2050 struct sk_buff *beacon,
2051 struct ieee80211_tx_control *control)
2052 {
2053 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2054 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2055 struct ieee80211_if_conf conf;
2056 static u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
2057
2058 if (!local->ops->config_interface || !netif_running(dev))
2059 return 0;
2060
2061 memset(&conf, 0, sizeof(conf));
2062 conf.type = sdata->type;
2063 if (sdata->type == IEEE80211_IF_TYPE_STA ||
2064 sdata->type == IEEE80211_IF_TYPE_IBSS) {
2065 if (local->sta_scanning &&
2066 local->scan_dev == dev)
2067 conf.bssid = scan_bssid;
2068 else
2069 conf.bssid = sdata->u.sta.bssid;
2070 conf.ssid = sdata->u.sta.ssid;
2071 conf.ssid_len = sdata->u.sta.ssid_len;
2072 conf.generic_elem = sdata->u.sta.extra_ie;
2073 conf.generic_elem_len = sdata->u.sta.extra_ie_len;
2074 } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
2075 conf.ssid = sdata->u.ap.ssid;
2076 conf.ssid_len = sdata->u.ap.ssid_len;
2077 conf.generic_elem = sdata->u.ap.generic_elem;
2078 conf.generic_elem_len = sdata->u.ap.generic_elem_len;
2079 conf.beacon = beacon;
2080 conf.beacon_control = control;
2081 }
2082 return local->ops->config_interface(local_to_hw(local),
2083 dev->ifindex, &conf);
2084 }
2085
2086 int ieee80211_if_config(struct net_device *dev)
2087 {
2088 return __ieee80211_if_config(dev, NULL, NULL);
2089 }
2090
2091 int ieee80211_if_config_beacon(struct net_device *dev)
2092 {
2093 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2094 struct ieee80211_tx_control control;
2095 struct sk_buff *skb;
2096
2097 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
2098 return 0;
2099 skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
2100 if (!skb)
2101 return -ENOMEM;
2102 return __ieee80211_if_config(dev, skb, &control);
2103 }
2104
2105 int ieee80211_hw_config(struct ieee80211_local *local)
2106 {
2107 struct ieee80211_hw_mode *mode;
2108 struct ieee80211_channel *chan;
2109 int ret = 0;
2110
2111 if (local->sta_scanning) {
2112 chan = local->scan_channel;
2113 mode = local->scan_hw_mode;
2114 } else {
2115 chan = local->oper_channel;
2116 mode = local->oper_hw_mode;
2117 }
2118
2119 local->hw.conf.channel = chan->chan;
2120 local->hw.conf.channel_val = chan->val;
2121 local->hw.conf.power_level = chan->power_level;
2122 local->hw.conf.freq = chan->freq;
2123 local->hw.conf.phymode = mode->mode;
2124 local->hw.conf.antenna_max = chan->antenna_max;
2125 local->hw.conf.chan = chan;
2126 local->hw.conf.mode = mode;
2127
2128 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2129 printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
2130 "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
2131 local->hw.conf.phymode);
2132 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2133
2134 if (local->ops->config)
2135 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
2136
2137 return ret;
2138 }
2139
2140
2141 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
2142 {
2143 /* FIX: what would be proper limits for MTU?
2144 * This interface uses 802.3 frames. */
2145 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
2146 printk(KERN_WARNING "%s: invalid MTU %d\n",
2147 dev->name, new_mtu);
2148 return -EINVAL;
2149 }
2150
2151 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2152 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2153 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2154 dev->mtu = new_mtu;
2155 return 0;
2156 }
2157
2158
2159 static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
2160 {
2161 /* FIX: what would be proper limits for MTU?
2162 * This interface uses 802.11 frames. */
2163 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
2164 printk(KERN_WARNING "%s: invalid MTU %d\n",
2165 dev->name, new_mtu);
2166 return -EINVAL;
2167 }
2168
2169 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2170 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2171 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2172 dev->mtu = new_mtu;
2173 return 0;
2174 }
2175
2176 enum netif_tx_lock_class {
2177 TX_LOCK_NORMAL,
2178 TX_LOCK_MASTER,
2179 };
2180
2181 static inline void netif_tx_lock_nested(struct net_device *dev, int subclass)
2182 {
2183 spin_lock_nested(&dev->_xmit_lock, subclass);
2184 dev->xmit_lock_owner = smp_processor_id();
2185 }
2186
2187 static void ieee80211_set_multicast_list(struct net_device *dev)
2188 {
2189 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2190 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2191 unsigned short flags;
2192
2193 netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
2194 if (((dev->flags & IFF_ALLMULTI) != 0) ^ (sdata->allmulti != 0)) {
2195 if (sdata->allmulti) {
2196 sdata->allmulti = 0;
2197 local->iff_allmultis--;
2198 } else {
2199 sdata->allmulti = 1;
2200 local->iff_allmultis++;
2201 }
2202 }
2203 if (((dev->flags & IFF_PROMISC) != 0) ^ (sdata->promisc != 0)) {
2204 if (sdata->promisc) {
2205 sdata->promisc = 0;
2206 local->iff_promiscs--;
2207 } else {
2208 sdata->promisc = 1;
2209 local->iff_promiscs++;
2210 }
2211 }
2212 if (dev->mc_count != sdata->mc_count) {
2213 local->mc_count = local->mc_count - sdata->mc_count +
2214 dev->mc_count;
2215 sdata->mc_count = dev->mc_count;
2216 }
2217 if (local->ops->set_multicast_list) {
2218 flags = local->mdev->flags;
2219 if (local->iff_allmultis)
2220 flags |= IFF_ALLMULTI;
2221 if (local->iff_promiscs)
2222 flags |= IFF_PROMISC;
2223 read_lock(&local->sub_if_lock);
2224 local->ops->set_multicast_list(local_to_hw(local), flags,
2225 local->mc_count);
2226 read_unlock(&local->sub_if_lock);
2227 }
2228 netif_tx_unlock(local->mdev);
2229 }
2230
2231 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
2232 struct dev_mc_list *prev,
2233 void **ptr)
2234 {
2235 struct ieee80211_local *local = hw_to_local(hw);
2236 struct ieee80211_sub_if_data *sdata = *ptr;
2237 struct dev_mc_list *mc;
2238
2239 if (!prev) {
2240 WARN_ON(sdata);
2241 sdata = NULL;
2242 }
2243 if (!prev || !prev->next) {
2244 if (sdata)
2245 sdata = list_entry(sdata->list.next,
2246 struct ieee80211_sub_if_data, list);
2247 else
2248 sdata = list_entry(local->sub_if_list.next,
2249 struct ieee80211_sub_if_data, list);
2250 if (&sdata->list != &local->sub_if_list)
2251 mc = sdata->dev->mc_list;
2252 else
2253 mc = NULL;
2254 } else
2255 mc = prev->next;
2256
2257 *ptr = sdata;
2258 return mc;
2259 }
2260 EXPORT_SYMBOL(ieee80211_get_mc_list_item);
2261
2262 static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
2263 {
2264 struct ieee80211_sub_if_data *sdata;
2265 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2266 return &(sdata->stats);
2267 }
2268
2269 static void ieee80211_if_shutdown(struct net_device *dev)
2270 {
2271 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2272 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2273
2274 ASSERT_RTNL();
2275 switch (sdata->type) {
2276 case IEEE80211_IF_TYPE_STA:
2277 case IEEE80211_IF_TYPE_IBSS:
2278 sdata->u.sta.state = IEEE80211_DISABLED;
2279 del_timer_sync(&sdata->u.sta.timer);
2280 skb_queue_purge(&sdata->u.sta.skb_queue);
2281 if (!local->ops->hw_scan &&
2282 local->scan_dev == sdata->dev) {
2283 local->sta_scanning = 0;
2284 cancel_delayed_work(&local->scan_work);
2285 }
2286 flush_workqueue(local->hw.workqueue);
2287 break;
2288 }
2289 }
2290
2291 static inline int identical_mac_addr_allowed(int type1, int type2)
2292 {
2293 return (type1 == IEEE80211_IF_TYPE_MNTR ||
2294 type2 == IEEE80211_IF_TYPE_MNTR ||
2295 (type1 == IEEE80211_IF_TYPE_AP &&
2296 type2 == IEEE80211_IF_TYPE_WDS) ||
2297 (type1 == IEEE80211_IF_TYPE_WDS &&
2298 (type2 == IEEE80211_IF_TYPE_WDS ||
2299 type2 == IEEE80211_IF_TYPE_AP)) ||
2300 (type1 == IEEE80211_IF_TYPE_AP &&
2301 type2 == IEEE80211_IF_TYPE_VLAN) ||
2302 (type1 == IEEE80211_IF_TYPE_VLAN &&
2303 (type2 == IEEE80211_IF_TYPE_AP ||
2304 type2 == IEEE80211_IF_TYPE_VLAN)));
2305 }
2306
2307 static int ieee80211_master_open(struct net_device *dev)
2308 {
2309 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2310 struct ieee80211_sub_if_data *sdata;
2311 int res = -EOPNOTSUPP;
2312
2313 read_lock(&local->sub_if_lock);
2314 list_for_each_entry(sdata, &local->sub_if_list, list) {
2315 if (sdata->dev != dev && netif_running(sdata->dev)) {
2316 res = 0;
2317 break;
2318 }
2319 }
2320 read_unlock(&local->sub_if_lock);
2321 return res;
2322 }
2323
2324 static int ieee80211_master_stop(struct net_device *dev)
2325 {
2326 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2327 struct ieee80211_sub_if_data *sdata;
2328
2329 read_lock(&local->sub_if_lock);
2330 list_for_each_entry(sdata, &local->sub_if_list, list)
2331 if (sdata->dev != dev && netif_running(sdata->dev))
2332 dev_close(sdata->dev);
2333 read_unlock(&local->sub_if_lock);
2334
2335 return 0;
2336 }
2337
2338 static int ieee80211_mgmt_open(struct net_device *dev)
2339 {
2340 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2341
2342 if (!netif_running(local->mdev))
2343 return -EOPNOTSUPP;
2344 return 0;
2345 }
2346
2347 static int ieee80211_mgmt_stop(struct net_device *dev)
2348 {
2349 return 0;
2350 }
2351
2352 /* Check if running monitor interfaces should go to a "soft monitor" mode
2353 * and switch them if necessary. */
2354 static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
2355 {
2356 struct ieee80211_if_init_conf conf;
2357
2358 if (local->open_count && local->open_count == local->monitors &&
2359 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
2360 local->ops->remove_interface) {
2361 conf.if_id = -1;
2362 conf.type = IEEE80211_IF_TYPE_MNTR;
2363 conf.mac_addr = NULL;
2364 local->ops->remove_interface(local_to_hw(local), &conf);
2365 }
2366 }
2367
2368 /* Check if running monitor interfaces should go to a "hard monitor" mode
2369 * and switch them if necessary. */
2370 static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
2371 {
2372 struct ieee80211_if_init_conf conf;
2373
2374 if (local->open_count && local->open_count == local->monitors &&
2375 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
2376 local->ops->add_interface) {
2377 conf.if_id = -1;
2378 conf.type = IEEE80211_IF_TYPE_MNTR;
2379 conf.mac_addr = NULL;
2380 local->ops->add_interface(local_to_hw(local), &conf);
2381 }
2382 }
2383
2384 static int ieee80211_open(struct net_device *dev)
2385 {
2386 struct ieee80211_sub_if_data *sdata, *nsdata;
2387 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2388 struct ieee80211_if_init_conf conf;
2389 int res;
2390
2391 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2392 read_lock(&local->sub_if_lock);
2393 list_for_each_entry(nsdata, &local->sub_if_list, list) {
2394 struct net_device *ndev = nsdata->dev;
2395
2396 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
2397 compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
2398 !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
2399 read_unlock(&local->sub_if_lock);
2400 return -ENOTUNIQ;
2401 }
2402 }
2403 read_unlock(&local->sub_if_lock);
2404
2405 if (sdata->type == IEEE80211_IF_TYPE_WDS &&
2406 is_zero_ether_addr(sdata->u.wds.remote_addr))
2407 return -ENOLINK;
2408
2409 if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
2410 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2411 /* run the interface in a "soft monitor" mode */
2412 local->monitors++;
2413 local->open_count++;
2414 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2415 return 0;
2416 }
2417 ieee80211_start_soft_monitor(local);
2418
2419 if (local->ops->add_interface) {
2420 conf.if_id = dev->ifindex;
2421 conf.type = sdata->type;
2422 conf.mac_addr = dev->dev_addr;
2423 res = local->ops->add_interface(local_to_hw(local), &conf);
2424 if (res) {
2425 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
2426 ieee80211_start_hard_monitor(local);
2427 return res;
2428 }
2429 } else {
2430 if (sdata->type != IEEE80211_IF_TYPE_STA)
2431 return -EOPNOTSUPP;
2432 if (local->open_count > 0)
2433 return -ENOBUFS;
2434 }
2435
2436 if (local->open_count == 0) {
2437 res = 0;
2438 tasklet_enable(&local->tx_pending_tasklet);
2439 tasklet_enable(&local->tasklet);
2440 if (local->ops->open)
2441 res = local->ops->open(local_to_hw(local));
2442 if (res == 0) {
2443 res = dev_open(local->mdev);
2444 if (res) {
2445 if (local->ops->stop)
2446 local->ops->stop(local_to_hw(local));
2447 } else {
2448 res = ieee80211_hw_config(local);
2449 if (res && local->ops->stop)
2450 local->ops->stop(local_to_hw(local));
2451 else if (!res && local->apdev)
2452 dev_open(local->apdev);
2453 }
2454 }
2455 if (res) {
2456 if (local->ops->remove_interface)
2457 local->ops->remove_interface(local_to_hw(local),
2458 &conf);
2459 return res;
2460 }
2461 }
2462 local->open_count++;
2463
2464 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2465 local->monitors++;
2466 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2467 } else
2468 ieee80211_if_config(dev);
2469
2470 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2471 !local->user_space_mlme)
2472 netif_carrier_off(dev);
2473
2474 netif_start_queue(dev);
2475 return 0;
2476 }
2477
2478
2479 static int ieee80211_stop(struct net_device *dev)
2480 {
2481 struct ieee80211_sub_if_data *sdata;
2482 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2483
2484 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2485
2486 if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
2487 local->open_count > 1 &&
2488 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2489 /* remove "soft monitor" interface */
2490 local->open_count--;
2491 local->monitors--;
2492 if (!local->monitors)
2493 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2494 return 0;
2495 }
2496
2497 netif_stop_queue(dev);
2498 ieee80211_if_shutdown(dev);
2499
2500 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2501 local->monitors--;
2502 if (!local->monitors)
2503 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2504 }
2505
2506 local->open_count--;
2507 if (local->open_count == 0) {
2508 if (netif_running(local->mdev))
2509 dev_close(local->mdev);
2510 if (local->apdev)
2511 dev_close(local->apdev);
2512 if (local->ops->stop)
2513 local->ops->stop(local_to_hw(local));
2514 tasklet_disable(&local->tx_pending_tasklet);
2515 tasklet_disable(&local->tasklet);
2516 }
2517 if (local->ops->remove_interface) {
2518 struct ieee80211_if_init_conf conf;
2519
2520 conf.if_id = dev->ifindex;
2521 conf.type = sdata->type;
2522 conf.mac_addr = dev->dev_addr;
2523 local->ops->remove_interface(local_to_hw(local), &conf);
2524 }
2525
2526 ieee80211_start_hard_monitor(local);
2527
2528 return 0;
2529 }
2530
2531
2532 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
2533 {
2534 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
2535 return ETH_ALEN;
2536 }
2537
2538 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
2539 {
2540 return compare_ether_addr(raddr, addr) == 0 ||
2541 is_broadcast_ether_addr(raddr);
2542 }
2543
2544
2545 static ieee80211_txrx_result
2546 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
2547 {
2548 struct net_device *dev = rx->dev;
2549 struct ieee80211_local *local = rx->local;
2550 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
2551 u16 fc, hdrlen, ethertype;
2552 u8 *payload;
2553 u8 dst[ETH_ALEN];
2554 u8 src[ETH_ALEN];
2555 struct sk_buff *skb = rx->skb, *skb2;
2556 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2557
2558 fc = rx->fc;
2559 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
2560 return TXRX_CONTINUE;
2561
2562 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
2563 return TXRX_DROP;
2564
2565 hdrlen = ieee80211_get_hdrlen(fc);
2566
2567 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
2568 * header
2569 * IEEE 802.11 address fields:
2570 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
2571 * 0 0 DA SA BSSID n/a
2572 * 0 1 DA BSSID SA n/a
2573 * 1 0 BSSID SA DA n/a
2574 * 1 1 RA TA DA SA
2575 */
2576
2577 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
2578 case IEEE80211_FCTL_TODS:
2579 /* BSSID SA DA */
2580 memcpy(dst, hdr->addr3, ETH_ALEN);
2581 memcpy(src, hdr->addr2, ETH_ALEN);
2582
2583 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
2584 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
2585 printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
2586 MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
2587 dev->name, MAC_ARG(hdr->addr1),
2588 MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
2589 return TXRX_DROP;
2590 }
2591 break;
2592 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
2593 /* RA TA DA SA */
2594 memcpy(dst, hdr->addr3, ETH_ALEN);
2595 memcpy(src, hdr->addr4, ETH_ALEN);
2596
2597 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
2598 printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
2599 MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
2600 MAC_FMT ")\n",
2601 rx->dev->name, MAC_ARG(hdr->addr1),
2602 MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
2603 MAC_ARG(hdr->addr4));
2604 return TXRX_DROP;
2605 }
2606 break;
2607 case IEEE80211_FCTL_FROMDS:
2608 /* DA BSSID SA */
2609 memcpy(dst, hdr->addr1, ETH_ALEN);
2610 memcpy(src, hdr->addr3, ETH_ALEN);
2611
2612 if (sdata->type != IEEE80211_IF_TYPE_STA) {
2613 return TXRX_DROP;
2614 }
2615 break;
2616 case 0:
2617 /* DA SA BSSID */
2618 memcpy(dst, hdr->addr1, ETH_ALEN);
2619 memcpy(src, hdr->addr2, ETH_ALEN);
2620
2621 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
2622 if (net_ratelimit()) {
2623 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
2624 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
2625 ")\n",
2626 dev->name, MAC_ARG(hdr->addr1),
2627 MAC_ARG(hdr->addr2),
2628 MAC_ARG(hdr->addr3));
2629 }
2630 return TXRX_DROP;
2631 }
2632 break;
2633 }
2634
2635 payload = skb->data + hdrlen;
2636
2637 if (unlikely(skb->len - hdrlen < 8)) {
2638 if (net_ratelimit()) {
2639 printk(KERN_DEBUG "%s: RX too short data frame "
2640 "payload\n", dev->name);
2641 }
2642 return TXRX_DROP;
2643 }
2644
2645 ethertype = (payload[6] << 8) | payload[7];
2646
2647 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
2648 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
2649 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
2650 /* remove RFC1042 or Bridge-Tunnel encapsulation and
2651 * replace EtherType */
2652 skb_pull(skb, hdrlen + 6);
2653 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
2654 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
2655 } else {
2656 struct ethhdr *ehdr;
2657 __be16 len;
2658 skb_pull(skb, hdrlen);
2659 len = htons(skb->len);
2660 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
2661 memcpy(ehdr->h_dest, dst, ETH_ALEN);
2662 memcpy(ehdr->h_source, src, ETH_ALEN);
2663 ehdr->h_proto = len;
2664 }
2665 skb->dev = dev;
2666
2667 skb2 = NULL;
2668
2669 sdata->stats.rx_packets++;
2670 sdata->stats.rx_bytes += skb->len;
2671
2672 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
2673 || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
2674 if (is_multicast_ether_addr(skb->data)) {
2675 /* send multicast frames both to higher layers in
2676 * local net stack and back to the wireless media */
2677 skb2 = skb_copy(skb, GFP_ATOMIC);
2678 if (!skb2)
2679 printk(KERN_DEBUG "%s: failed to clone "
2680 "multicast frame\n", dev->name);
2681 } else {
2682 struct sta_info *dsta;
2683 dsta = sta_info_get(local, skb->data);
2684 if (dsta && !dsta->dev) {
2685 printk(KERN_DEBUG "Station with null dev "
2686 "structure!\n");
2687 } else if (dsta && dsta->dev == dev) {
2688 /* Destination station is associated to this
2689 * AP, so send the frame directly to it and
2690 * do not pass the frame to local net stack.
2691 */
2692 skb2 = skb;
2693 skb = NULL;
2694 }
2695 if (dsta)
2696 sta_info_put(dsta);
2697 }
2698 }
2699
2700 if (skb) {
2701 /* deliver to local stack */
2702 skb->protocol = eth_type_trans(skb, dev);
2703 memset(skb->cb, 0, sizeof(skb->cb));
2704 netif_rx(skb);
2705 }
2706
2707 if (skb2) {
2708 /* send to wireless media */
2709 skb2->protocol = __constant_htons(ETH_P_802_3);
2710 skb_set_network_header(skb2, 0);
2711 skb_set_mac_header(skb2, 0);
2712 dev_queue_xmit(skb2);
2713 }
2714
2715 return TXRX_QUEUED;
2716 }
2717
2718
2719 static struct ieee80211_rate *
2720 ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
2721 {
2722 struct ieee80211_hw_mode *mode;
2723 int r;
2724
2725 list_for_each_entry(mode, &local->modes_list, list) {
2726 if (mode->mode != phymode)
2727 continue;
2728 for (r = 0; r < mode->num_rates; r++) {
2729 struct ieee80211_rate *rate = &mode->rates[r];
2730 if (rate->val == hw_rate ||
2731 (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
2732 rate->val2 == hw_rate))
2733 return rate;
2734 }
2735 }
2736
2737 return NULL;
2738 }
2739
2740 static void
2741 ieee80211_fill_frame_info(struct ieee80211_local *local,
2742 struct ieee80211_frame_info *fi,
2743 struct ieee80211_rx_status *status)
2744 {
2745 if (status) {
2746 struct timespec ts;
2747 struct ieee80211_rate *rate;
2748
2749 jiffies_to_timespec(jiffies, &ts);
2750 fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
2751 ts.tv_nsec / 1000);
2752 fi->mactime = cpu_to_be64(status->mactime);
2753 switch (status->phymode) {
2754 case MODE_IEEE80211A:
2755 fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
2756 break;
2757 case MODE_IEEE80211B:
2758 fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
2759 break;
2760 case MODE_IEEE80211G:
2761 fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
2762 break;
2763 case MODE_ATHEROS_TURBO:
2764 fi->phytype =
2765 htonl(ieee80211_phytype_dsss_dot11_turbo);
2766 break;
2767 default:
2768 fi->phytype = htonl(0xAAAAAAAA);
2769 break;
2770 }
2771 fi->channel = htonl(status->channel);
2772 rate = ieee80211_get_rate(local, status->phymode,
2773 status->rate);
2774 if (rate) {
2775 fi->datarate = htonl(rate->rate);
2776 if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
2777 if (status->rate == rate->val)
2778 fi->preamble = htonl(2); /* long */
2779 else if (status->rate == rate->val2)
2780 fi->preamble = htonl(1); /* short */
2781 } else
2782 fi->preamble = htonl(0);
2783 } else {
2784 fi->datarate = htonl(0);
2785 fi->preamble = htonl(0);
2786 }
2787
2788 fi->antenna = htonl(status->antenna);
2789 fi->priority = htonl(0xffffffff); /* no clue */
2790 fi->ssi_type = htonl(ieee80211_ssi_raw);
2791 fi->ssi_signal = htonl(status->ssi);
2792 fi->ssi_noise = 0x00000000;
2793 fi->encoding = 0;
2794 } else {
2795 /* clear everything because we really don't know.
2796 * the msg_type field isn't present on monitor frames
2797 * so we don't know whether it will be present or not,
2798 * but it's ok to not clear it since it'll be assigned
2799 * anyway */
2800 memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
2801
2802 fi->ssi_type = htonl(ieee80211_ssi_none);
2803 }
2804 fi->version = htonl(IEEE80211_FI_VERSION);
2805 fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
2806 }
2807
2808 /* this routine is actually not just for this, but also
2809 * for pushing fake 'management' frames into userspace.
2810 * it shall be replaced by a netlink-based system. */
2811 void
2812 ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
2813 struct ieee80211_rx_status *status, u32 msg_type)
2814 {
2815 struct ieee80211_frame_info *fi;
2816 const size_t hlen = sizeof(struct ieee80211_frame_info);
2817 struct ieee80211_sub_if_data *sdata;
2818
2819 skb->dev = local->apdev;
2820
2821 sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
2822
2823 if (skb_headroom(skb) < hlen) {
2824 I802_DEBUG_INC(local->rx_expand_skb_head);
2825 if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
2826 dev_kfree_skb(skb);
2827 return;
2828 }
2829 }
2830
2831 fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
2832
2833 ieee80211_fill_frame_info(local, fi, status);
2834 fi->msg_type = htonl(msg_type);
2835
2836 sdata->stats.rx_packets++;
2837 sdata->stats.rx_bytes += skb->len;
2838
2839 skb_set_mac_header(skb, 0);
2840 skb->ip_summed = CHECKSUM_UNNECESSARY;
2841 skb->pkt_type = PACKET_OTHERHOST;
2842 skb->protocol = htons(ETH_P_802_2);
2843 memset(skb->cb, 0, sizeof(skb->cb));
2844 netif_rx(skb);
2845 }
2846
2847 static void
2848 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
2849 struct ieee80211_rx_status *status)
2850 {
2851 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2852 struct ieee80211_sub_if_data *sdata;
2853 struct ieee80211_rate *rate;
2854 struct ieee80211_rtap_hdr {
2855 struct ieee80211_radiotap_header hdr;
2856 u8 flags;
2857 u8 rate;
2858 __le16 chan_freq;
2859 __le16 chan_flags;
2860 u8 antsignal;
2861 } __attribute__ ((packed)) *rthdr;
2862
2863 skb->dev = dev;
2864
2865 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2866
2867 if (status->flag & RX_FLAG_RADIOTAP)
2868 goto out;
2869
2870 if (skb_headroom(skb) < sizeof(*rthdr)) {
2871 I802_DEBUG_INC(local->rx_expand_skb_head);
2872 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
2873 dev_kfree_skb(skb);
2874 return;
2875 }
2876 }
2877
2878 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
2879 memset(rthdr, 0, sizeof(*rthdr));
2880 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
2881 rthdr->hdr.it_present =
2882 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
2883 (1 << IEEE80211_RADIOTAP_RATE) |
2884 (1 << IEEE80211_RADIOTAP_CHANNEL) |
2885 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
2886 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
2887 IEEE80211_RADIOTAP_F_FCS : 0;
2888 rate = ieee80211_get_rate(local, status->phymode, status->rate);
2889 if (rate)
2890 rthdr->rate = rate->rate / 5;
2891 rthdr->chan_freq = cpu_to_le16(status->freq);
2892 rthdr->chan_flags =
2893 status->phymode == MODE_IEEE80211A ?
2894 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
2895 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
2896 rthdr->antsignal = status->ssi;
2897
2898 out:
2899 sdata->stats.rx_packets++;
2900 sdata->stats.rx_bytes += skb->len;
2901
2902 skb_set_mac_header(skb, 0);
2903 skb->ip_summed = CHECKSUM_UNNECESSARY;
2904 skb->pkt_type = PACKET_OTHERHOST;
2905 skb->protocol = htons(ETH_P_802_2);
2906 memset(skb->cb, 0, sizeof(skb->cb));
2907 netif_rx(skb);
2908 }
2909
2910 int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
2911 int radar, int radar_type)
2912 {
2913 struct sk_buff *skb;
2914 struct ieee80211_radar_info *msg;
2915 struct ieee80211_local *local = hw_to_local(hw);
2916
2917 if (!local->apdev)
2918 return 0;
2919
2920 skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
2921 sizeof(struct ieee80211_radar_info));
2922
2923 if (!skb)
2924 return -ENOMEM;
2925 skb_reserve(skb, sizeof(struct ieee80211_frame_info));
2926
2927 msg = (struct ieee80211_radar_info *)
2928 skb_put(skb, sizeof(struct ieee80211_radar_info));
2929 msg->channel = channel;
2930 msg->radar = radar;
2931 msg->radar_type = radar_type;
2932
2933 ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
2934 return 0;
2935 }
2936 EXPORT_SYMBOL(ieee80211_radar_status);
2937
2938 int ieee80211_set_aid_for_sta(struct ieee80211_hw *hw, u8 *peer_address,
2939 u16 aid)
2940 {
2941 struct sk_buff *skb;
2942 struct ieee80211_msg_set_aid_for_sta *msg;
2943 struct ieee80211_local *local = hw_to_local(hw);
2944
2945 /* unlikely because if this event only happens for APs,
2946 * which require an open ap device. */
2947 if (unlikely(!local->apdev))
2948 return 0;
2949
2950 skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
2951 sizeof(struct ieee80211_msg_set_aid_for_sta));
2952
2953 if (!skb)
2954 return -ENOMEM;
2955 skb_reserve(skb, sizeof(struct ieee80211_frame_info));
2956
2957 msg = (struct ieee80211_msg_set_aid_for_sta *)
2958 skb_put(skb, sizeof(struct ieee80211_msg_set_aid_for_sta));
2959 memcpy(msg->sta_address, peer_address, ETH_ALEN);
2960 msg->aid = aid;
2961
2962 ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_set_aid_for_sta);
2963 return 0;
2964 }
2965 EXPORT_SYMBOL(ieee80211_set_aid_for_sta);
2966
2967 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
2968 {
2969 struct ieee80211_sub_if_data *sdata;
2970 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
2971
2972 if (sdata->bss)
2973 atomic_inc(&sdata->bss->num_sta_ps);
2974 sta->flags |= WLAN_STA_PS;
2975 sta->pspoll = 0;
2976 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
2977 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
2978 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
2979 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
2980 }
2981
2982
2983 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
2984 {
2985 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2986 struct sk_buff *skb;
2987 int sent = 0;
2988 struct ieee80211_sub_if_data *sdata;
2989 struct ieee80211_tx_packet_data *pkt_data;
2990
2991 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
2992 if (sdata->bss)
2993 atomic_dec(&sdata->bss->num_sta_ps);
2994 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
2995 sta->pspoll = 0;
2996 if (!skb_queue_empty(&sta->ps_tx_buf)) {
2997 if (local->ops->set_tim)
2998 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
2999 if (sdata->bss)
3000 bss_tim_clear(local, sdata->bss, sta->aid);
3001 }
3002 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3003 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
3004 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3005 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3006 /* Send all buffered frames to the station */
3007 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
3008 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3009 sent++;
3010 pkt_data->requeue = 1;
3011 dev_queue_xmit(skb);
3012 }
3013 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
3014 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3015 local->total_ps_buffered--;
3016 sent++;
3017 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3018 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
3019 "since STA not sleeping anymore\n", dev->name,
3020 MAC_ARG(sta->addr), sta->aid);
3021 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3022 pkt_data->requeue = 1;
3023 dev_queue_xmit(skb);
3024 }
3025
3026 return sent;
3027 }
3028
3029
3030 static ieee80211_txrx_result
3031 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
3032 {
3033 struct sk_buff *skb;
3034 int no_pending_pkts;
3035
3036 if (likely(!rx->sta ||
3037 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
3038 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
3039 !rx->u.rx.ra_match))
3040 return TXRX_CONTINUE;
3041
3042 skb = skb_dequeue(&rx->sta->tx_filtered);
3043 if (!skb) {
3044 skb = skb_dequeue(&rx->sta->ps_tx_buf);
3045 if (skb)
3046 rx->local->total_ps_buffered--;
3047 }
3048 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
3049 skb_queue_empty(&rx->sta->ps_tx_buf);
3050
3051 if (skb) {
3052 struct ieee80211_hdr *hdr =
3053 (struct ieee80211_hdr *) skb->data;
3054
3055 /* tell TX path to send one frame even though the STA may
3056 * still remain is PS mode after this frame exchange */
3057 rx->sta->pspoll = 1;
3058
3059 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3060 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
3061 "after %d)\n",
3062 MAC_ARG(rx->sta->addr), rx->sta->aid,
3063 skb_queue_len(&rx->sta->ps_tx_buf));
3064 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3065
3066 /* Use MoreData flag to indicate whether there are more
3067 * buffered frames for this STA */
3068 if (no_pending_pkts) {
3069 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
3070 rx->sta->flags &= ~WLAN_STA_TIM;
3071 } else
3072 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3073
3074 dev_queue_xmit(skb);
3075
3076 if (no_pending_pkts) {
3077 if (rx->local->ops->set_tim)
3078 rx->local->ops->set_tim(local_to_hw(rx->local),
3079 rx->sta->aid, 0);
3080 if (rx->sdata->bss)
3081 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
3082 }
3083 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3084 } else if (!rx->u.rx.sent_ps_buffered) {
3085 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
3086 "though there is no buffered frames for it\n",
3087 rx->dev->name, MAC_ARG(rx->sta->addr));
3088 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3089
3090 }
3091
3092 /* Free PS Poll skb here instead of returning TXRX_DROP that would
3093 * count as an dropped frame. */
3094 dev_kfree_skb(rx->skb);
3095
3096 return TXRX_QUEUED;
3097 }
3098
3099
3100 static inline struct ieee80211_fragment_entry *
3101 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
3102 unsigned int frag, unsigned int seq, int rx_queue,
3103 struct sk_buff **skb)
3104 {
3105 struct ieee80211_fragment_entry *entry;
3106 int idx;
3107
3108 idx = sdata->fragment_next;
3109 entry = &sdata->fragments[sdata->fragment_next++];
3110 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
3111 sdata->fragment_next = 0;
3112
3113 if (!skb_queue_empty(&entry->skb_list)) {
3114 #ifdef CONFIG_MAC80211_DEBUG
3115 struct ieee80211_hdr *hdr =
3116 (struct ieee80211_hdr *) entry->skb_list.next->data;
3117 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
3118 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
3119 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
3120 sdata->dev->name, idx,
3121 jiffies - entry->first_frag_time, entry->seq,
3122 entry->last_frag, MAC_ARG(hdr->addr1),
3123 MAC_ARG(hdr->addr2));
3124 #endif /* CONFIG_MAC80211_DEBUG */
3125 __skb_queue_purge(&entry->skb_list);
3126 }
3127
3128 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
3129 *skb = NULL;
3130 entry->first_frag_time = jiffies;
3131 entry->seq = seq;
3132 entry->rx_queue = rx_queue;
3133 entry->last_frag = frag;
3134 entry->ccmp = 0;
3135 entry->extra_len = 0;
3136
3137 return entry;
3138 }
3139
3140
3141 static inline struct ieee80211_fragment_entry *
3142 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
3143 u16 fc, unsigned int frag, unsigned int seq,
3144 int rx_queue, struct ieee80211_hdr *hdr)
3145 {
3146 struct ieee80211_fragment_entry *entry;
3147 int i, idx;
3148
3149 idx = sdata->fragment_next;
3150 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
3151 struct ieee80211_hdr *f_hdr;
3152 u16 f_fc;
3153
3154 idx--;
3155 if (idx < 0)
3156 idx = IEEE80211_FRAGMENT_MAX - 1;
3157
3158 entry = &sdata->fragments[idx];
3159 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
3160 entry->rx_queue != rx_queue ||
3161 entry->last_frag + 1 != frag)
3162 continue;
3163
3164 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
3165 f_fc = le16_to_cpu(f_hdr->frame_control);
3166
3167 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
3168 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
3169 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
3170 continue;
3171
3172 if (entry->first_frag_time + 2 * HZ < jiffies) {
3173 __skb_queue_purge(&entry->skb_list);
3174 continue;
3175 }
3176 return entry;
3177 }
3178
3179 return NULL;
3180 }
3181
3182
3183 static ieee80211_txrx_result
3184 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
3185 {
3186 struct ieee80211_hdr *hdr;
3187 u16 sc;
3188 unsigned int frag, seq;
3189 struct ieee80211_fragment_entry *entry;
3190 struct sk_buff *skb;
3191
3192 hdr = (struct ieee80211_hdr *) rx->skb->data;
3193 sc = le16_to_cpu(hdr->seq_ctrl);
3194 frag = sc & IEEE80211_SCTL_FRAG;
3195
3196 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
3197 (rx->skb)->len < 24 ||
3198 is_multicast_ether_addr(hdr->addr1))) {
3199 /* not fragmented */
3200 goto out;
3201 }
3202 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
3203
3204 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
3205
3206 if (frag == 0) {
3207 /* This is the first fragment of a new frame. */
3208 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
3209 rx->u.rx.queue, &(rx->skb));
3210 if (rx->key && rx->key->alg == ALG_CCMP &&
3211 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
3212 /* Store CCMP PN so that we can verify that the next
3213 * fragment has a sequential PN value. */
3214 entry->ccmp = 1;
3215 memcpy(entry->last_pn,
3216 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
3217 CCMP_PN_LEN);
3218 }
3219 return TXRX_QUEUED;
3220 }
3221
3222 /* This is a fragment for a frame that should already be pending in
3223 * fragment cache. Add this fragment to the end of the pending entry.
3224 */
3225 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
3226 rx->u.rx.queue, hdr);
3227 if (!entry) {
3228 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3229 return TXRX_DROP;
3230 }
3231
3232 /* Verify that MPDUs within one MSDU have sequential PN values.
3233 * (IEEE 802.11i, 8.3.3.4.5) */
3234 if (entry->ccmp) {
3235 int i;
3236 u8 pn[CCMP_PN_LEN], *rpn;
3237 if (!rx->key || rx->key->alg != ALG_CCMP)
3238 return TXRX_DROP;
3239 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
3240 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
3241 pn[i]++;
3242 if (pn[i])
3243 break;
3244 }
3245 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
3246 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
3247 printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
3248 " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
3249 "(expected %02x%02x%02x%02x%02x%02x)\n",
3250 rx->dev->name, MAC_ARG(hdr->addr2),
3251 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
3252 pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
3253 return TXRX_DROP;
3254 }
3255 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
3256 }
3257
3258 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
3259 __skb_queue_tail(&entry->skb_list, rx->skb);
3260 entry->last_frag = frag;
3261 entry->extra_len += rx->skb->len;
3262 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
3263 rx->skb = NULL;
3264 return TXRX_QUEUED;
3265 }
3266
3267 rx->skb = __skb_dequeue(&entry->skb_list);
3268 if (skb_tailroom(rx->skb) < entry->extra_len) {
3269 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
3270 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
3271 GFP_ATOMIC))) {
3272 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3273 __skb_queue_purge(&entry->skb_list);
3274 return TXRX_DROP;
3275 }
3276 }
3277 while ((skb = __skb_dequeue(&entry->skb_list)))
3278 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
3279
3280 /* Complete frame has been reassembled - process it now */
3281 rx->fragmented = 1;
3282
3283 out:
3284 if (rx->sta)
3285 rx->sta->rx_packets++;
3286 if (is_multicast_ether_addr(hdr->addr1))
3287 rx->local->dot11MulticastReceivedFrameCount++;
3288 else
3289 ieee80211_led_rx(rx->local);
3290 return TXRX_CONTINUE;
3291 }
3292
3293
3294 static ieee80211_txrx_result
3295 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
3296 {
3297 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
3298 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
3299 return TXRX_QUEUED;
3300 }
3301
3302 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
3303 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb));
3304
3305 return TXRX_CONTINUE;
3306 }
3307
3308
3309 static ieee80211_txrx_result
3310 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
3311 {
3312 struct ieee80211_hdr *hdr;
3313 int always_sta_key;
3314 hdr = (struct ieee80211_hdr *) rx->skb->data;
3315
3316 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
3317 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
3318 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
3319 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
3320 hdr->seq_ctrl)) {
3321 if (rx->u.rx.ra_match) {
3322 rx->local->dot11FrameDuplicateCount++;
3323 rx->sta->num_duplicates++;
3324 }
3325 return TXRX_DROP;
3326 } else
3327 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
3328 }
3329
3330 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
3331 rx->skb->len > FCS_LEN)
3332 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
3333
3334 if (unlikely(rx->skb->len < 16)) {
3335 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
3336 return TXRX_DROP;
3337 }
3338
3339 if (!rx->u.rx.ra_match)
3340 rx->skb->pkt_type = PACKET_OTHERHOST;
3341 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
3342 rx->skb->pkt_type = PACKET_HOST;
3343 else if (is_multicast_ether_addr(hdr->addr1)) {
3344 if (is_broadcast_ether_addr(hdr->addr1))
3345 rx->skb->pkt_type = PACKET_BROADCAST;
3346 else
3347 rx->skb->pkt_type = PACKET_MULTICAST;
3348 } else
3349 rx->skb->pkt_type = PACKET_OTHERHOST;
3350
3351 /* Drop disallowed frame classes based on STA auth/assoc state;
3352 * IEEE 802.11, Chap 5.5.
3353 *
3354 * 80211.o does filtering only based on association state, i.e., it
3355 * drops Class 3 frames from not associated stations. hostapd sends
3356 * deauth/disassoc frames when needed. In addition, hostapd is
3357 * responsible for filtering on both auth and assoc states.
3358 */
3359 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
3360 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
3361 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
3362 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
3363 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
3364 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
3365 !(rx->fc & IEEE80211_FCTL_TODS) &&
3366 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
3367 || !rx->u.rx.ra_match) {
3368 /* Drop IBSS frames and frames for other hosts
3369 * silently. */
3370 return TXRX_DROP;
3371 }
3372
3373 if (!rx->local->apdev)
3374 return TXRX_DROP;
3375
3376 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3377 ieee80211_msg_sta_not_assoc);
3378 return TXRX_QUEUED;
3379 }
3380
3381 if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
3382 always_sta_key = 0;
3383 else
3384 always_sta_key = 1;
3385
3386 if (rx->sta && rx->sta->key && always_sta_key) {
3387 rx->key = rx->sta->key;
3388 } else {
3389 if (rx->sta && rx->sta->key)
3390 rx->key = rx->sta->key;
3391 else
3392 rx->key = rx->sdata->default_key;
3393
3394 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3395 rx->fc & IEEE80211_FCTL_PROTECTED) {
3396 int keyidx = ieee80211_wep_get_keyidx(rx->skb);
3397
3398 if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
3399 (!rx->sta || !rx->sta->key || keyidx > 0))
3400 rx->key = rx->sdata->keys[keyidx];
3401
3402 if (!rx->key) {
3403 if (!rx->u.rx.ra_match)
3404 return TXRX_DROP;
3405 printk(KERN_DEBUG "%s: RX WEP frame with "
3406 "unknown keyidx %d (A1=" MAC_FMT " A2="
3407 MAC_FMT " A3=" MAC_FMT ")\n",
3408 rx->dev->name, keyidx,
3409 MAC_ARG(hdr->addr1),
3410 MAC_ARG(hdr->addr2),
3411 MAC_ARG(hdr->addr3));
3412 if (!rx->local->apdev)
3413 return TXRX_DROP;
3414 ieee80211_rx_mgmt(
3415 rx->local, rx->skb, rx->u.rx.status,
3416 ieee80211_msg_wep_frame_unknown_key);
3417 return TXRX_QUEUED;
3418 }
3419 }
3420 }
3421
3422 if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
3423 rx->key->tx_rx_count++;
3424 if (unlikely(rx->local->key_tx_rx_threshold &&
3425 rx->key->tx_rx_count >
3426 rx->local->key_tx_rx_threshold)) {
3427 ieee80211_key_threshold_notify(rx->dev, rx->key,
3428 rx->sta);
3429 }
3430 }
3431
3432 return TXRX_CONTINUE;
3433 }
3434
3435
3436 static ieee80211_txrx_result
3437 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
3438 {
3439 struct sta_info *sta = rx->sta;
3440 struct net_device *dev = rx->dev;
3441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3442
3443 if (!sta)
3444 return TXRX_CONTINUE;
3445
3446 /* Update last_rx only for IBSS packets which are for the current
3447 * BSSID to avoid keeping the current IBSS network alive in cases where
3448 * other STAs are using different BSSID. */
3449 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
3450 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
3451 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
3452 sta->last_rx = jiffies;
3453 } else
3454 if (!is_multicast_ether_addr(hdr->addr1) ||
3455 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
3456 /* Update last_rx only for unicast frames in order to prevent
3457 * the Probe Request frames (the only broadcast frames from a
3458 * STA in infrastructure mode) from keeping a connection alive.
3459 */
3460 sta->last_rx = jiffies;
3461 }
3462
3463 if (!rx->u.rx.ra_match)
3464 return TXRX_CONTINUE;
3465
3466 sta->rx_fragments++;
3467 sta->rx_bytes += rx->skb->len;
3468 sta->last_rssi = (sta->last_rssi * 15 +
3469 rx->u.rx.status->ssi) / 16;
3470 sta->last_signal = (sta->last_signal * 15 +
3471 rx->u.rx.status->signal) / 16;
3472 sta->last_noise = (sta->last_noise * 15 +
3473 rx->u.rx.status->noise) / 16;
3474
3475 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
3476 /* Change STA power saving mode only in the end of a frame
3477 * exchange sequence */
3478 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
3479 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
3480 else if (!(sta->flags & WLAN_STA_PS) &&
3481 (rx->fc & IEEE80211_FCTL_PM))
3482 ap_sta_ps_start(dev, sta);
3483 }
3484
3485 /* Drop data::nullfunc frames silently, since they are used only to
3486 * control station power saving mode. */
3487 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3488 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
3489 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
3490 /* Update counter and free packet here to avoid counting this
3491 * as a dropped packed. */
3492 sta->rx_packets++;
3493 dev_kfree_skb(rx->skb);
3494 return TXRX_QUEUED;
3495 }
3496
3497 return TXRX_CONTINUE;
3498 } /* ieee80211_rx_h_sta_process */
3499
3500
3501 static ieee80211_txrx_result
3502 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
3503 {
3504 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3505 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
3506 !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
3507 return TXRX_CONTINUE;
3508
3509 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
3510 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
3511 rx->key->force_sw_encrypt) {
3512 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
3513 if (iv) {
3514 rx->sta->wep_weak_iv_count++;
3515 }
3516 }
3517
3518 return TXRX_CONTINUE;
3519 }
3520
3521
3522 static ieee80211_txrx_result
3523 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
3524 {
3525 /* If the device handles decryption totally, skip this test */
3526 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3527 return TXRX_CONTINUE;
3528
3529 if ((rx->key && rx->key->alg != ALG_WEP) ||
3530 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3531 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3532 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3533 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
3534 return TXRX_CONTINUE;
3535
3536 if (!rx->key) {
3537 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
3538 rx->dev->name);
3539 return TXRX_DROP;
3540 }
3541
3542 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
3543 rx->key->force_sw_encrypt) {
3544 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
3545 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
3546 "failed\n", rx->dev->name);
3547 return TXRX_DROP;
3548 }
3549 } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
3550 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
3551 /* remove ICV */
3552 skb_trim(rx->skb, rx->skb->len - 4);
3553 }
3554
3555 return TXRX_CONTINUE;
3556 }
3557
3558
3559 static ieee80211_txrx_result
3560 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
3561 {
3562 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
3563 rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
3564 /* Pass both encrypted and unencrypted EAPOL frames to user
3565 * space for processing. */
3566 if (!rx->local->apdev)
3567 return TXRX_DROP;
3568 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3569 ieee80211_msg_normal);
3570 return TXRX_QUEUED;
3571 }
3572
3573 if (unlikely(rx->sdata->ieee802_1x &&
3574 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3575 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3576 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
3577 !ieee80211_is_eapol(rx->skb))) {
3578 #ifdef CONFIG_MAC80211_DEBUG
3579 struct ieee80211_hdr *hdr =
3580 (struct ieee80211_hdr *) rx->skb->data;
3581 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
3582 " (unauthorized port)\n", rx->dev->name,
3583 MAC_ARG(hdr->addr2));
3584 #endif /* CONFIG_MAC80211_DEBUG */
3585 return TXRX_DROP;
3586 }
3587
3588 return TXRX_CONTINUE;
3589 }
3590
3591
3592 static ieee80211_txrx_result
3593 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
3594 {
3595 /* If the device handles decryption totally, skip this test */
3596 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3597 return TXRX_CONTINUE;
3598
3599 /* Drop unencrypted frames if key is set. */
3600 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
3601 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3602 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3603 (rx->key || rx->sdata->drop_unencrypted) &&
3604 (rx->sdata->eapol == 0 ||
3605 !ieee80211_is_eapol(rx->skb)))) {
3606 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
3607 "encryption\n", rx->dev->name);
3608 return TXRX_DROP;
3609 }
3610 return TXRX_CONTINUE;
3611 }
3612
3613
3614 static ieee80211_txrx_result
3615 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
3616 {
3617 struct ieee80211_sub_if_data *sdata;
3618
3619 if (!rx->u.rx.ra_match)
3620 return TXRX_DROP;
3621
3622 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
3623 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
3624 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
3625 !rx->local->user_space_mlme) {
3626 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
3627 } else {
3628 /* Management frames are sent to hostapd for processing */
3629 if (!rx->local->apdev)
3630 return TXRX_DROP;
3631 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3632 ieee80211_msg_normal);
3633 }
3634 return TXRX_QUEUED;
3635 }
3636
3637
3638 static ieee80211_txrx_result
3639 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
3640 {
3641 struct ieee80211_local *local = rx->local;
3642 struct sk_buff *skb = rx->skb;
3643
3644 if (unlikely(local->sta_scanning != 0)) {
3645 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
3646 return TXRX_QUEUED;
3647 }
3648
3649 if (unlikely(rx->u.rx.in_scan)) {
3650 /* scanning finished during invoking of handlers */
3651 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
3652 return TXRX_DROP;
3653 }
3654
3655 return TXRX_CONTINUE;
3656 }
3657
3658
3659 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
3660 struct ieee80211_hdr *hdr,
3661 struct sta_info *sta,
3662 struct ieee80211_txrx_data *rx)
3663 {
3664 int keyidx, hdrlen;
3665
3666 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
3667 if (rx->skb->len >= hdrlen + 4)
3668 keyidx = rx->skb->data[hdrlen + 3] >> 6;
3669 else
3670 keyidx = -1;
3671
3672 /* TODO: verify that this is not triggered by fragmented
3673 * frames (hw does not verify MIC for them). */
3674 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
3675 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
3676 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
3677
3678 if (!sta) {
3679 /* Some hardware versions seem to generate incorrect
3680 * Michael MIC reports; ignore them to avoid triggering
3681 * countermeasures. */
3682 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3683 "error for unknown address " MAC_FMT "\n",
3684 dev->name, MAC_ARG(hdr->addr2));
3685 goto ignore;
3686 }
3687
3688 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
3689 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3690 "error for a frame with no ISWEP flag (src "
3691 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
3692 goto ignore;
3693 }
3694
3695 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3696 rx->sdata->type == IEEE80211_IF_TYPE_AP) {
3697 keyidx = ieee80211_wep_get_keyidx(rx->skb);
3698 /* AP with Pairwise keys support should never receive Michael
3699 * MIC errors for non-zero keyidx because these are reserved
3700 * for group keys and only the AP is sending real multicast
3701 * frames in BSS. */
3702 if (keyidx) {
3703 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
3704 "a frame with non-zero keyidx (%d) (src " MAC_FMT
3705 ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
3706 goto ignore;
3707 }
3708 }
3709
3710 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3711 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3712 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
3713 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3714 "error for a frame that cannot be encrypted "
3715 "(fc=0x%04x) (src " MAC_FMT ")\n",
3716 dev->name, rx->fc, MAC_ARG(hdr->addr2));
3717 goto ignore;
3718 }
3719
3720 do {
3721 union iwreq_data wrqu;
3722 char *buf = kmalloc(128, GFP_ATOMIC);
3723 if (!buf)
3724 break;
3725
3726 /* TODO: needed parameters: count, key type, TSC */
3727 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
3728 "keyid=%d %scast addr=" MAC_FMT ")",
3729 keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
3730 MAC_ARG(hdr->addr2));
3731 memset(&wrqu, 0, sizeof(wrqu));
3732 wrqu.data.length = strlen(buf);
3733 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
3734 kfree(buf);
3735 } while (0);
3736
3737 /* TODO: consider verifying the MIC error report with software
3738 * implementation if we get too many spurious reports from the
3739 * hardware. */
3740 if (!rx->local->apdev)
3741 goto ignore;
3742 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3743 ieee80211_msg_michael_mic_failure);
3744 return;
3745
3746 ignore:
3747 dev_kfree_skb(rx->skb);
3748 rx->skb = NULL;
3749 }
3750
3751 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
3752 struct ieee80211_local *local,
3753 ieee80211_rx_handler *handlers,
3754 struct ieee80211_txrx_data *rx,
3755 struct sta_info *sta)
3756 {
3757 ieee80211_rx_handler *handler;
3758 ieee80211_txrx_result res = TXRX_DROP;
3759
3760 for (handler = handlers; *handler != NULL; handler++) {
3761 res = (*handler)(rx);
3762 if (res != TXRX_CONTINUE) {
3763 if (res == TXRX_DROP) {
3764 I802_DEBUG_INC(local->rx_handlers_drop);
3765 if (sta)
3766 sta->rx_dropped++;
3767 }
3768 if (res == TXRX_QUEUED)
3769 I802_DEBUG_INC(local->rx_handlers_queued);
3770 break;
3771 }
3772 }
3773
3774 if (res == TXRX_DROP) {
3775 dev_kfree_skb(rx->skb);
3776 }
3777 return res;
3778 }
3779
3780 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
3781 ieee80211_rx_handler *handlers,
3782 struct ieee80211_txrx_data *rx,
3783 struct sta_info *sta)
3784 {
3785 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
3786 TXRX_CONTINUE)
3787 dev_kfree_skb(rx->skb);
3788 }
3789
3790 /*
3791 * This is the receive path handler. It is called by a low level driver when an
3792 * 802.11 MPDU is received from the hardware.
3793 */
3794 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
3795 struct ieee80211_rx_status *status)
3796 {
3797 struct ieee80211_local *local = hw_to_local(hw);
3798 struct ieee80211_sub_if_data *sdata;
3799 struct sta_info *sta;
3800 struct ieee80211_hdr *hdr;
3801 struct ieee80211_txrx_data rx;
3802 u16 type;
3803 int multicast;
3804 int radiotap_len = 0;
3805
3806 if (status->flag & RX_FLAG_RADIOTAP) {
3807 radiotap_len = ieee80211_get_radiotap_len(skb);
3808 skb_pull(skb, radiotap_len);
3809 }
3810
3811 hdr = (struct ieee80211_hdr *) skb->data;
3812 memset(&rx, 0, sizeof(rx));
3813 rx.skb = skb;
3814 rx.local = local;
3815
3816 rx.u.rx.status = status;
3817 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
3818 type = rx.fc & IEEE80211_FCTL_FTYPE;
3819 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
3820 local->dot11ReceivedFragmentCount++;
3821 multicast = is_multicast_ether_addr(hdr->addr1);
3822
3823 if (skb->len >= 16)
3824 sta = rx.sta = sta_info_get(local, hdr->addr2);
3825 else
3826 sta = rx.sta = NULL;
3827
3828 if (sta) {
3829 rx.dev = sta->dev;
3830 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
3831 }
3832
3833 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
3834 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
3835 goto end;
3836 }
3837
3838 if (unlikely(local->sta_scanning))
3839 rx.u.rx.in_scan = 1;
3840
3841 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
3842 sta) != TXRX_CONTINUE)
3843 goto end;
3844 skb = rx.skb;
3845
3846 skb_push(skb, radiotap_len);
3847 if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
3848 !local->iff_promiscs && !multicast) {
3849 rx.u.rx.ra_match = 1;
3850 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
3851 sta);
3852 } else {
3853 struct ieee80211_sub_if_data *prev = NULL;
3854 struct sk_buff *skb_new;
3855 u8 *bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
3856
3857 read_lock(&local->sub_if_lock);
3858 list_for_each_entry(sdata, &local->sub_if_list, list) {
3859 rx.u.rx.ra_match = 1;
3860 switch (sdata->type) {
3861 case IEEE80211_IF_TYPE_STA:
3862 if (!bssid)
3863 continue;
3864 if (!ieee80211_bssid_match(bssid,
3865 sdata->u.sta.bssid)) {
3866 if (!rx.u.rx.in_scan)
3867 continue;
3868 rx.u.rx.ra_match = 0;
3869 } else if (!multicast &&
3870 compare_ether_addr(sdata->dev->dev_addr,
3871 hdr->addr1) != 0) {
3872 if (!sdata->promisc)
3873 continue;
3874 rx.u.rx.ra_match = 0;
3875 }
3876 break;
3877 case IEEE80211_IF_TYPE_IBSS:
3878 if (!bssid)
3879 continue;
3880 if (!ieee80211_bssid_match(bssid,
3881 sdata->u.sta.bssid)) {
3882 if (!rx.u.rx.in_scan)
3883 continue;
3884 rx.u.rx.ra_match = 0;
3885 } else if (!multicast &&
3886 compare_ether_addr(sdata->dev->dev_addr,
3887 hdr->addr1) != 0) {
3888 if (!sdata->promisc)
3889 continue;
3890 rx.u.rx.ra_match = 0;
3891 } else if (!sta)
3892 sta = rx.sta =
3893 ieee80211_ibss_add_sta(sdata->dev,
3894 skb, bssid,
3895 hdr->addr2);
3896 break;
3897 case IEEE80211_IF_TYPE_AP:
3898 if (!bssid) {
3899 if (compare_ether_addr(sdata->dev->dev_addr,
3900 hdr->addr1) != 0)
3901 continue;
3902 } else if (!ieee80211_bssid_match(bssid,
3903 sdata->dev->dev_addr)) {
3904 if (!rx.u.rx.in_scan)
3905 continue;
3906 rx.u.rx.ra_match = 0;
3907 }
3908 if (sdata->dev == local->mdev &&
3909 !rx.u.rx.in_scan)
3910 /* do not receive anything via
3911 * master device when not scanning */
3912 continue;
3913 break;
3914 case IEEE80211_IF_TYPE_WDS:
3915 if (bssid ||
3916 (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
3917 continue;
3918 if (compare_ether_addr(sdata->u.wds.remote_addr,
3919 hdr->addr2) != 0)
3920 continue;
3921 break;
3922 }
3923
3924 if (prev) {
3925 skb_new = skb_copy(skb, GFP_ATOMIC);
3926 if (!skb_new) {
3927 if (net_ratelimit())
3928 printk(KERN_DEBUG "%s: failed to copy "
3929 "multicast frame for %s",
3930 local->mdev->name, prev->dev->name);
3931 continue;
3932 }
3933 rx.skb = skb_new;
3934 rx.dev = prev->dev;
3935 rx.sdata = prev;
3936 ieee80211_invoke_rx_handlers(local,
3937 local->rx_handlers,
3938 &rx, sta);
3939 }
3940 prev = sdata;
3941 }
3942 if (prev) {
3943 rx.skb = skb;
3944 rx.dev = prev->dev;
3945 rx.sdata = prev;
3946 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
3947 &rx, sta);
3948 } else
3949 dev_kfree_skb(skb);
3950 read_unlock(&local->sub_if_lock);
3951 }
3952
3953 end:
3954 if (sta)
3955 sta_info_put(sta);
3956 }
3957 EXPORT_SYMBOL(__ieee80211_rx);
3958
3959 static ieee80211_txrx_result
3960 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
3961 {
3962 struct ieee80211_local *local = tx->local;
3963 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
3964 struct sk_buff *skb = tx->skb;
3965 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
3966 u32 load = 0, hdrtime;
3967
3968 /* TODO: this could be part of tx_status handling, so that the number
3969 * of retries would be known; TX rate should in that case be stored
3970 * somewhere with the packet */
3971
3972 /* Estimate total channel use caused by this frame */
3973
3974 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
3975 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
3976
3977 if (mode->mode == MODE_IEEE80211A ||
3978 mode->mode == MODE_ATHEROS_TURBO ||
3979 mode->mode == MODE_ATHEROS_TURBOG ||
3980 (mode->mode == MODE_IEEE80211G &&
3981 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
3982 hdrtime = CHAN_UTIL_HDR_SHORT;
3983 else
3984 hdrtime = CHAN_UTIL_HDR_LONG;
3985
3986 load = hdrtime;
3987 if (!is_multicast_ether_addr(hdr->addr1))
3988 load += hdrtime;
3989
3990 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
3991 load += 2 * hdrtime;
3992 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
3993 load += hdrtime;
3994
3995 load += skb->len * tx->u.tx.rate->rate_inv;
3996
3997 if (tx->u.tx.extra_frag) {
3998 int i;
3999 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
4000 load += 2 * hdrtime;
4001 load += tx->u.tx.extra_frag[i]->len *
4002 tx->u.tx.rate->rate;
4003 }
4004 }
4005
4006 /* Divide channel_use by 8 to avoid wrapping around the counter */
4007 load >>= CHAN_UTIL_SHIFT;
4008 local->channel_use_raw += load;
4009 if (tx->sta)
4010 tx->sta->channel_use_raw += load;
4011 tx->sdata->channel_use_raw += load;
4012
4013 return TXRX_CONTINUE;
4014 }
4015
4016
4017 static ieee80211_txrx_result
4018 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
4019 {
4020 struct ieee80211_local *local = rx->local;
4021 struct sk_buff *skb = rx->skb;
4022 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4023 u32 load = 0, hdrtime;
4024 struct ieee80211_rate *rate;
4025 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
4026 int i;
4027
4028 /* Estimate total channel use caused by this frame */
4029
4030 if (unlikely(mode->num_rates < 0))
4031 return TXRX_CONTINUE;
4032
4033 rate = &mode->rates[0];
4034 for (i = 0; i < mode->num_rates; i++) {
4035 if (mode->rates[i].val == rx->u.rx.status->rate) {
4036 rate = &mode->rates[i];
4037 break;
4038 }
4039 }
4040
4041 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4042 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4043
4044 if (mode->mode == MODE_IEEE80211A ||
4045 mode->mode == MODE_ATHEROS_TURBO ||
4046 mode->mode == MODE_ATHEROS_TURBOG ||
4047 (mode->mode == MODE_IEEE80211G &&
4048 rate->flags & IEEE80211_RATE_ERP))
4049 hdrtime = CHAN_UTIL_HDR_SHORT;
4050 else
4051 hdrtime = CHAN_UTIL_HDR_LONG;
4052
4053 load = hdrtime;
4054 if (!is_multicast_ether_addr(hdr->addr1))
4055 load += hdrtime;
4056
4057 load += skb->len * rate->rate_inv;
4058
4059 /* Divide channel_use by 8 to avoid wrapping around the counter */
4060 load >>= CHAN_UTIL_SHIFT;
4061 local->channel_use_raw += load;
4062 if (rx->sta)
4063 rx->sta->channel_use_raw += load;
4064 rx->u.rx.load = load;
4065
4066 return TXRX_CONTINUE;
4067 }
4068
4069 static ieee80211_txrx_result
4070 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
4071 {
4072 rx->sdata->channel_use_raw += rx->u.rx.load;
4073 return TXRX_CONTINUE;
4074 }
4075
4076 static void ieee80211_stat_refresh(unsigned long data)
4077 {
4078 struct ieee80211_local *local = (struct ieee80211_local *) data;
4079 struct sta_info *sta;
4080 struct ieee80211_sub_if_data *sdata;
4081
4082 if (!local->stat_time)
4083 return;
4084
4085 /* go through all stations */
4086 spin_lock_bh(&local->sta_lock);
4087 list_for_each_entry(sta, &local->sta_list, list) {
4088 sta->channel_use = (sta->channel_use_raw / local->stat_time) /
4089 CHAN_UTIL_PER_10MS;
4090 sta->channel_use_raw = 0;
4091 }
4092 spin_unlock_bh(&local->sta_lock);
4093
4094 /* go through all subinterfaces */
4095 read_lock(&local->sub_if_lock);
4096 list_for_each_entry(sdata, &local->sub_if_list, list) {
4097 sdata->channel_use = (sdata->channel_use_raw /
4098 local->stat_time) / CHAN_UTIL_PER_10MS;
4099 sdata->channel_use_raw = 0;
4100 }
4101 read_unlock(&local->sub_if_lock);
4102
4103 /* hardware interface */
4104 local->channel_use = (local->channel_use_raw /
4105 local->stat_time) / CHAN_UTIL_PER_10MS;
4106 local->channel_use_raw = 0;
4107
4108 local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
4109 add_timer(&local->stat_timer);
4110 }
4111
4112
4113 /* This is a version of the rx handler that can be called from hard irq
4114 * context. Post the skb on the queue and schedule the tasklet */
4115 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
4116 struct ieee80211_rx_status *status)
4117 {
4118 struct ieee80211_local *local = hw_to_local(hw);
4119
4120 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4121
4122 skb->dev = local->mdev;
4123 /* copy status into skb->cb for use by tasklet */
4124 memcpy(skb->cb, status, sizeof(*status));
4125 skb->pkt_type = IEEE80211_RX_MSG;
4126 skb_queue_tail(&local->skb_queue, skb);
4127 tasklet_schedule(&local->tasklet);
4128 }
4129 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4130
4131 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
4132 struct sk_buff *skb,
4133 struct ieee80211_tx_status *status)
4134 {
4135 struct ieee80211_local *local = hw_to_local(hw);
4136 struct ieee80211_tx_status *saved;
4137 int tmp;
4138
4139 skb->dev = local->mdev;
4140 saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
4141 if (unlikely(!saved)) {
4142 if (net_ratelimit())
4143 printk(KERN_WARNING "%s: Not enough memory, "
4144 "dropping tx status", skb->dev->name);
4145 /* should be dev_kfree_skb_irq, but due to this function being
4146 * named _irqsafe instead of just _irq we can't be sure that
4147 * people won't call it from non-irq contexts */
4148 dev_kfree_skb_any(skb);
4149 return;
4150 }
4151 memcpy(saved, status, sizeof(struct ieee80211_tx_status));
4152 /* copy pointer to saved status into skb->cb for use by tasklet */
4153 memcpy(skb->cb, &saved, sizeof(saved));
4154
4155 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
4156 skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
4157 &local->skb_queue : &local->skb_queue_unreliable, skb);
4158 tmp = skb_queue_len(&local->skb_queue) +
4159 skb_queue_len(&local->skb_queue_unreliable);
4160 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
4161 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4162 memcpy(&saved, skb->cb, sizeof(saved));
4163 kfree(saved);
4164 dev_kfree_skb_irq(skb);
4165 tmp--;
4166 I802_DEBUG_INC(local->tx_status_drop);
4167 }
4168 tasklet_schedule(&local->tasklet);
4169 }
4170 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
4171
4172 static void ieee80211_tasklet_handler(unsigned long data)
4173 {
4174 struct ieee80211_local *local = (struct ieee80211_local *) data;
4175 struct sk_buff *skb;
4176 struct ieee80211_rx_status rx_status;
4177 struct ieee80211_tx_status *tx_status;
4178
4179 while ((skb = skb_dequeue(&local->skb_queue)) ||
4180 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4181 switch (skb->pkt_type) {
4182 case IEEE80211_RX_MSG:
4183 /* status is in skb->cb */
4184 memcpy(&rx_status, skb->cb, sizeof(rx_status));
4185 /* Clear skb->type in order to not confuse kernel
4186 * netstack. */
4187 skb->pkt_type = 0;
4188 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
4189 break;
4190 case IEEE80211_TX_STATUS_MSG:
4191 /* get pointer to saved status out of skb->cb */
4192 memcpy(&tx_status, skb->cb, sizeof(tx_status));
4193 skb->pkt_type = 0;
4194 ieee80211_tx_status(local_to_hw(local),
4195 skb, tx_status);
4196 kfree(tx_status);
4197 break;
4198 default: /* should never get here! */
4199 printk(KERN_ERR "%s: Unknown message type (%d)\n",
4200 local->mdev->name, skb->pkt_type);
4201 dev_kfree_skb(skb);
4202 break;
4203 }
4204 }
4205 }
4206
4207
4208 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
4209 * make a prepared TX frame (one that has been given to hw) to look like brand
4210 * new IEEE 802.11 frame that is ready to go through TX processing again.
4211 * Also, tx_packet_data in cb is restored from tx_control. */
4212 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
4213 struct ieee80211_key *key,
4214 struct sk_buff *skb,
4215 struct ieee80211_tx_control *control)
4216 {
4217 int hdrlen, iv_len, mic_len;
4218 struct ieee80211_tx_packet_data *pkt_data;
4219
4220 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
4221 pkt_data->ifindex = control->ifindex;
4222 pkt_data->mgmt_iface = (control->type == IEEE80211_IF_TYPE_MGMT);
4223 pkt_data->req_tx_status = !!(control->flags & IEEE80211_TXCTL_REQ_TX_STATUS);
4224 pkt_data->do_not_encrypt = !!(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT);
4225 pkt_data->requeue = !!(control->flags & IEEE80211_TXCTL_REQUEUE);
4226 pkt_data->queue = control->queue;
4227
4228 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
4229
4230 if (!key)
4231 goto no_key;
4232
4233 switch (key->alg) {
4234 case ALG_WEP:
4235 iv_len = WEP_IV_LEN;
4236 mic_len = WEP_ICV_LEN;
4237 break;
4238 case ALG_TKIP:
4239 iv_len = TKIP_IV_LEN;
4240 mic_len = TKIP_ICV_LEN;
4241 break;
4242 case ALG_CCMP:
4243 iv_len = CCMP_HDR_LEN;
4244 mic_len = CCMP_MIC_LEN;
4245 break;
4246 default:
4247 goto no_key;
4248 }
4249
4250 if (skb->len >= mic_len && key->force_sw_encrypt)
4251 skb_trim(skb, skb->len - mic_len);
4252 if (skb->len >= iv_len && skb->len > hdrlen) {
4253 memmove(skb->data + iv_len, skb->data, hdrlen);
4254 skb_pull(skb, iv_len);
4255 }
4256
4257 no_key:
4258 {
4259 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4260 u16 fc = le16_to_cpu(hdr->frame_control);
4261 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
4262 fc &= ~IEEE80211_STYPE_QOS_DATA;
4263 hdr->frame_control = cpu_to_le16(fc);
4264 memmove(skb->data + 2, skb->data, hdrlen - 2);
4265 skb_pull(skb, 2);
4266 }
4267 }
4268 }
4269
4270
4271 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
4272 struct ieee80211_tx_status *status)
4273 {
4274 struct sk_buff *skb2;
4275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4276 struct ieee80211_local *local = hw_to_local(hw);
4277 u16 frag, type;
4278 u32 msg_type;
4279
4280 if (!status) {
4281 printk(KERN_ERR
4282 "%s: ieee80211_tx_status called with NULL status\n",
4283 local->mdev->name);
4284 dev_kfree_skb(skb);
4285 return;
4286 }
4287
4288 if (status->excessive_retries) {
4289 struct sta_info *sta;
4290 sta = sta_info_get(local, hdr->addr1);
4291 if (sta) {
4292 if (sta->flags & WLAN_STA_PS) {
4293 /* The STA is in power save mode, so assume
4294 * that this TX packet failed because of that.
4295 */
4296 status->excessive_retries = 0;
4297 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
4298 }
4299 sta_info_put(sta);
4300 }
4301 }
4302
4303 if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
4304 struct sta_info *sta;
4305 sta = sta_info_get(local, hdr->addr1);
4306 if (sta) {
4307 sta->tx_filtered_count++;
4308
4309 /* Clear the TX filter mask for this STA when sending
4310 * the next packet. If the STA went to power save mode,
4311 * this will happen when it is waking up for the next
4312 * time. */
4313 sta->clear_dst_mask = 1;
4314
4315 /* TODO: Is the WLAN_STA_PS flag always set here or is
4316 * the race between RX and TX status causing some
4317 * packets to be filtered out before 80211.o gets an
4318 * update for PS status? This seems to be the case, so
4319 * no changes are likely to be needed. */
4320 if (sta->flags & WLAN_STA_PS &&
4321 skb_queue_len(&sta->tx_filtered) <
4322 STA_MAX_TX_BUFFER) {
4323 ieee80211_remove_tx_extra(local, sta->key,
4324 skb,
4325 &status->control);
4326 skb_queue_tail(&sta->tx_filtered, skb);
4327 } else if (!(sta->flags & WLAN_STA_PS) &&
4328 !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
4329 /* Software retry the packet once */
4330 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
4331 ieee80211_remove_tx_extra(local, sta->key,
4332 skb,
4333 &status->control);
4334 dev_queue_xmit(skb);
4335 } else {
4336 if (net_ratelimit()) {
4337 printk(KERN_DEBUG "%s: dropped TX "
4338 "filtered frame queue_len=%d "
4339 "PS=%d @%lu\n",
4340 local->mdev->name,
4341 skb_queue_len(
4342 &sta->tx_filtered),
4343 !!(sta->flags & WLAN_STA_PS),
4344 jiffies);
4345 }
4346 dev_kfree_skb(skb);
4347 }
4348 sta_info_put(sta);
4349 return;
4350 }
4351 } else {
4352 /* FIXME: STUPID to call this with both local and local->mdev */
4353 rate_control_tx_status(local, local->mdev, skb, status);
4354 }
4355
4356 ieee80211_led_tx(local, 0);
4357
4358 /* SNMP counters
4359 * Fragments are passed to low-level drivers as separate skbs, so these
4360 * are actually fragments, not frames. Update frame counters only for
4361 * the first fragment of the frame. */
4362
4363 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
4364 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
4365
4366 if (status->flags & IEEE80211_TX_STATUS_ACK) {
4367 if (frag == 0) {
4368 local->dot11TransmittedFrameCount++;
4369 if (is_multicast_ether_addr(hdr->addr1))
4370 local->dot11MulticastTransmittedFrameCount++;
4371 if (status->retry_count > 0)
4372 local->dot11RetryCount++;
4373 if (status->retry_count > 1)
4374 local->dot11MultipleRetryCount++;
4375 }
4376
4377 /* This counter shall be incremented for an acknowledged MPDU
4378 * with an individual address in the address 1 field or an MPDU
4379 * with a multicast address in the address 1 field of type Data
4380 * or Management. */
4381 if (!is_multicast_ether_addr(hdr->addr1) ||
4382 type == IEEE80211_FTYPE_DATA ||
4383 type == IEEE80211_FTYPE_MGMT)
4384 local->dot11TransmittedFragmentCount++;
4385 } else {
4386 if (frag == 0)
4387 local->dot11FailedCount++;
4388 }
4389
4390 if (!(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS)
4391 || unlikely(!local->apdev)) {
4392 dev_kfree_skb(skb);
4393 return;
4394 }
4395
4396 msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
4397 ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
4398
4399 /* skb was the original skb used for TX. Clone it and give the clone
4400 * to netif_rx(). Free original skb. */
4401 skb2 = skb_copy(skb, GFP_ATOMIC);
4402 if (!skb2) {
4403 dev_kfree_skb(skb);
4404 return;
4405 }
4406 dev_kfree_skb(skb);
4407 skb = skb2;
4408
4409 /* Send frame to hostapd */
4410 ieee80211_rx_mgmt(local, skb, NULL, msg_type);
4411 }
4412 EXPORT_SYMBOL(ieee80211_tx_status);
4413
4414 /* TODO: implement register/unregister functions for adding TX/RX handlers
4415 * into ordered list */
4416
4417 /* rx_pre handlers don't have dev and sdata fields available in
4418 * ieee80211_txrx_data */
4419 static ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
4420 {
4421 ieee80211_rx_h_parse_qos,
4422 ieee80211_rx_h_load_stats,
4423 NULL
4424 };
4425
4426 static ieee80211_rx_handler ieee80211_rx_handlers[] =
4427 {
4428 ieee80211_rx_h_if_stats,
4429 ieee80211_rx_h_monitor,
4430 ieee80211_rx_h_passive_scan,
4431 ieee80211_rx_h_check,
4432 ieee80211_rx_h_sta_process,
4433 ieee80211_rx_h_ccmp_decrypt,
4434 ieee80211_rx_h_tkip_decrypt,
4435 ieee80211_rx_h_wep_weak_iv_detection,
4436 ieee80211_rx_h_wep_decrypt,
4437 ieee80211_rx_h_defragment,
4438 ieee80211_rx_h_ps_poll,
4439 ieee80211_rx_h_michael_mic_verify,
4440 /* this must be after decryption - so header is counted in MPDU mic
4441 * must be before pae and data, so QOS_DATA format frames
4442 * are not passed to user space by these functions
4443 */
4444 ieee80211_rx_h_remove_qos_control,
4445 ieee80211_rx_h_802_1x_pae,
4446 ieee80211_rx_h_drop_unencrypted,
4447 ieee80211_rx_h_data,
4448 ieee80211_rx_h_mgmt,
4449 NULL
4450 };
4451
4452 static ieee80211_tx_handler ieee80211_tx_handlers[] =
4453 {
4454 ieee80211_tx_h_check_assoc,
4455 ieee80211_tx_h_sequence,
4456 ieee80211_tx_h_ps_buf,
4457 ieee80211_tx_h_select_key,
4458 ieee80211_tx_h_michael_mic_add,
4459 ieee80211_tx_h_fragment,
4460 ieee80211_tx_h_tkip_encrypt,
4461 ieee80211_tx_h_ccmp_encrypt,
4462 ieee80211_tx_h_wep_encrypt,
4463 ieee80211_tx_h_rate_ctrl,
4464 ieee80211_tx_h_misc,
4465 ieee80211_tx_h_load_stats,
4466 NULL
4467 };
4468
4469
4470 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
4471 {
4472 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4473 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4474 struct sta_info *sta;
4475
4476 if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
4477 return 0;
4478
4479 /* Create STA entry for the new peer */
4480 sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
4481 if (!sta)
4482 return -ENOMEM;
4483 sta_info_put(sta);
4484
4485 /* Remove STA entry for the old peer */
4486 sta = sta_info_get(local, sdata->u.wds.remote_addr);
4487 if (sta) {
4488 sta_info_put(sta);
4489 sta_info_free(sta, 0);
4490 } else {
4491 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
4492 "peer " MAC_FMT "\n",
4493 dev->name, MAC_ARG(sdata->u.wds.remote_addr));
4494 }
4495
4496 /* Update WDS link data */
4497 memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
4498
4499 return 0;
4500 }
4501
4502 /* Must not be called for mdev and apdev */
4503 void ieee80211_if_setup(struct net_device *dev)
4504 {
4505 ether_setup(dev);
4506 dev->hard_start_xmit = ieee80211_subif_start_xmit;
4507 dev->wireless_handlers = &ieee80211_iw_handler_def;
4508 dev->set_multicast_list = ieee80211_set_multicast_list;
4509 dev->change_mtu = ieee80211_change_mtu;
4510 dev->get_stats = ieee80211_get_stats;
4511 dev->open = ieee80211_open;
4512 dev->stop = ieee80211_stop;
4513 dev->uninit = ieee80211_if_reinit;
4514 dev->destructor = ieee80211_if_free;
4515 }
4516
4517 void ieee80211_if_mgmt_setup(struct net_device *dev)
4518 {
4519 ether_setup(dev);
4520 dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
4521 dev->change_mtu = ieee80211_change_mtu_apdev;
4522 dev->get_stats = ieee80211_get_stats;
4523 dev->open = ieee80211_mgmt_open;
4524 dev->stop = ieee80211_mgmt_stop;
4525 dev->type = ARPHRD_IEEE80211_PRISM;
4526 dev->hard_header_parse = header_parse_80211;
4527 dev->uninit = ieee80211_if_reinit;
4528 dev->destructor = ieee80211_if_free;
4529 }
4530
4531 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
4532 const char *name)
4533 {
4534 struct rate_control_ref *ref, *old;
4535
4536 ASSERT_RTNL();
4537 if (local->open_count || netif_running(local->mdev) ||
4538 (local->apdev && netif_running(local->apdev)))
4539 return -EBUSY;
4540
4541 ref = rate_control_alloc(name, local);
4542 if (!ref) {
4543 printk(KERN_WARNING "%s: Failed to select rate control "
4544 "algorithm\n", local->mdev->name);
4545 return -ENOENT;
4546 }
4547
4548 old = local->rate_ctrl;
4549 local->rate_ctrl = ref;
4550 if (old) {
4551 rate_control_put(old);
4552 sta_info_flush(local, NULL);
4553 }
4554
4555 printk(KERN_DEBUG "%s: Selected rate control "
4556 "algorithm '%s'\n", local->mdev->name,
4557 ref->ops->name);
4558
4559
4560 return 0;
4561 }
4562
4563 static void rate_control_deinitialize(struct ieee80211_local *local)
4564 {
4565 struct rate_control_ref *ref;
4566
4567 ref = local->rate_ctrl;
4568 local->rate_ctrl = NULL;
4569 rate_control_put(ref);
4570 }
4571
4572 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
4573 const struct ieee80211_ops *ops)
4574 {
4575 struct net_device *mdev;
4576 struct ieee80211_local *local;
4577 struct ieee80211_sub_if_data *sdata;
4578 int priv_size;
4579 struct wiphy *wiphy;
4580
4581 /* Ensure 32-byte alignment of our private data and hw private data.
4582 * We use the wiphy priv data for both our ieee80211_local and for
4583 * the driver's private data
4584 *
4585 * In memory it'll be like this:
4586 *
4587 * +-------------------------+
4588 * | struct wiphy |
4589 * +-------------------------+
4590 * | struct ieee80211_local |
4591 * +-------------------------+
4592 * | driver's private data |
4593 * +-------------------------+
4594 *
4595 */
4596 priv_size = ((sizeof(struct ieee80211_local) +
4597 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
4598 priv_data_len;
4599
4600 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
4601
4602 if (!wiphy)
4603 return NULL;
4604
4605 wiphy->privid = mac80211_wiphy_privid;
4606
4607 local = wiphy_priv(wiphy);
4608 local->hw.wiphy = wiphy;
4609
4610 local->hw.priv = (char *)local +
4611 ((sizeof(struct ieee80211_local) +
4612 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4613
4614 local->ops = ops;
4615
4616 /* for now, mdev needs sub_if_data :/ */
4617 mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
4618 "wmaster%d", ether_setup);
4619 if (!mdev) {
4620 wiphy_free(wiphy);
4621 return NULL;
4622 }
4623
4624 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
4625 mdev->ieee80211_ptr = &sdata->wdev;
4626 sdata->wdev.wiphy = wiphy;
4627
4628 local->hw.queues = 1; /* default */
4629
4630 local->mdev = mdev;
4631 local->rx_pre_handlers = ieee80211_rx_pre_handlers;
4632 local->rx_handlers = ieee80211_rx_handlers;
4633 local->tx_handlers = ieee80211_tx_handlers;
4634
4635 local->bridge_packets = 1;
4636
4637 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
4638 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
4639 local->short_retry_limit = 7;
4640 local->long_retry_limit = 4;
4641 local->hw.conf.radio_enabled = 1;
4642 local->rate_ctrl_num_up = RATE_CONTROL_NUM_UP;
4643 local->rate_ctrl_num_down = RATE_CONTROL_NUM_DOWN;
4644
4645 local->enabled_modes = (unsigned int) -1;
4646
4647 INIT_LIST_HEAD(&local->modes_list);
4648
4649 rwlock_init(&local->sub_if_lock);
4650 INIT_LIST_HEAD(&local->sub_if_list);
4651
4652 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
4653 init_timer(&local->stat_timer);
4654 local->stat_timer.function = ieee80211_stat_refresh;
4655 local->stat_timer.data = (unsigned long) local;
4656 ieee80211_rx_bss_list_init(mdev);
4657
4658 sta_info_init(local);
4659
4660 mdev->hard_start_xmit = ieee80211_master_start_xmit;
4661 mdev->open = ieee80211_master_open;
4662 mdev->stop = ieee80211_master_stop;
4663 mdev->type = ARPHRD_IEEE80211;
4664 mdev->hard_header_parse = header_parse_80211;
4665
4666 sdata->type = IEEE80211_IF_TYPE_AP;
4667 sdata->dev = mdev;
4668 sdata->local = local;
4669 sdata->u.ap.force_unicast_rateidx = -1;
4670 sdata->u.ap.max_ratectrl_rateidx = -1;
4671 ieee80211_if_sdata_init(sdata);
4672 list_add_tail(&sdata->list, &local->sub_if_list);
4673
4674 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
4675 (unsigned long)local);
4676 tasklet_disable(&local->tx_pending_tasklet);
4677
4678 tasklet_init(&local->tasklet,
4679 ieee80211_tasklet_handler,
4680 (unsigned long) local);
4681 tasklet_disable(&local->tasklet);
4682
4683 skb_queue_head_init(&local->skb_queue);
4684 skb_queue_head_init(&local->skb_queue_unreliable);
4685
4686 return local_to_hw(local);
4687 }
4688 EXPORT_SYMBOL(ieee80211_alloc_hw);
4689
4690 int ieee80211_register_hw(struct ieee80211_hw *hw)
4691 {
4692 struct ieee80211_local *local = hw_to_local(hw);
4693 const char *name;
4694 int result;
4695
4696 result = wiphy_register(local->hw.wiphy);
4697 if (result < 0)
4698 return result;
4699
4700 name = wiphy_dev(local->hw.wiphy)->driver->name;
4701 local->hw.workqueue = create_singlethread_workqueue(name);
4702 if (!local->hw.workqueue) {
4703 result = -ENOMEM;
4704 goto fail_workqueue;
4705 }
4706
4707 local->hw.conf.beacon_int = 1000;
4708
4709 local->wstats_flags |= local->hw.max_rssi ?
4710 IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
4711 local->wstats_flags |= local->hw.max_signal ?
4712 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
4713 local->wstats_flags |= local->hw.max_noise ?
4714 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
4715 if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
4716 local->wstats_flags |= IW_QUAL_DBM;
4717
4718 result = sta_info_start(local);
4719 if (result < 0)
4720 goto fail_sta_info;
4721
4722 rtnl_lock();
4723 result = dev_alloc_name(local->mdev, local->mdev->name);
4724 if (result < 0)
4725 goto fail_dev;
4726
4727 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
4728 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
4729
4730 result = register_netdevice(local->mdev);
4731 if (result < 0)
4732 goto fail_dev;
4733
4734 result = ieee80211_init_rate_ctrl_alg(local, NULL);
4735 if (result < 0) {
4736 printk(KERN_DEBUG "%s: Failed to initialize rate control "
4737 "algorithm\n", local->mdev->name);
4738 goto fail_rate;
4739 }
4740
4741 result = ieee80211_wep_init(local);
4742
4743 if (result < 0) {
4744 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
4745 local->mdev->name);
4746 goto fail_wep;
4747 }
4748
4749 ieee80211_install_qdisc(local->mdev);
4750
4751 /* add one default STA interface */
4752 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
4753 IEEE80211_IF_TYPE_STA);
4754 if (result)
4755 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
4756 local->mdev->name);
4757
4758 local->reg_state = IEEE80211_DEV_REGISTERED;
4759 rtnl_unlock();
4760
4761 ieee80211_led_init(local);
4762
4763 return 0;
4764
4765 fail_wep:
4766 rate_control_deinitialize(local);
4767 fail_rate:
4768 unregister_netdevice(local->mdev);
4769 fail_dev:
4770 rtnl_unlock();
4771 sta_info_stop(local);
4772 fail_sta_info:
4773 destroy_workqueue(local->hw.workqueue);
4774 fail_workqueue:
4775 wiphy_unregister(local->hw.wiphy);
4776 return result;
4777 }
4778 EXPORT_SYMBOL(ieee80211_register_hw);
4779
4780 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
4781 struct ieee80211_hw_mode *mode)
4782 {
4783 struct ieee80211_local *local = hw_to_local(hw);
4784 struct ieee80211_rate *rate;
4785 int i;
4786
4787 INIT_LIST_HEAD(&mode->list);
4788 list_add_tail(&mode->list, &local->modes_list);
4789
4790 local->hw_modes |= (1 << mode->mode);
4791 for (i = 0; i < mode->num_rates; i++) {
4792 rate = &(mode->rates[i]);
4793 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
4794 }
4795 ieee80211_prepare_rates(local, mode);
4796
4797 if (!local->oper_hw_mode) {
4798 /* Default to this mode */
4799 local->hw.conf.phymode = mode->mode;
4800 local->oper_hw_mode = local->scan_hw_mode = mode;
4801 local->oper_channel = local->scan_channel = &mode->channels[0];
4802 local->hw.conf.mode = local->oper_hw_mode;
4803 local->hw.conf.chan = local->oper_channel;
4804 }
4805
4806 if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
4807 ieee80211_init_client(local->mdev);
4808
4809 return 0;
4810 }
4811 EXPORT_SYMBOL(ieee80211_register_hwmode);
4812
4813 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
4814 {
4815 struct ieee80211_local *local = hw_to_local(hw);
4816 struct ieee80211_sub_if_data *sdata, *tmp;
4817 struct list_head tmp_list;
4818 int i;
4819
4820 tasklet_kill(&local->tx_pending_tasklet);
4821 tasklet_kill(&local->tasklet);
4822
4823 rtnl_lock();
4824
4825 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
4826
4827 local->reg_state = IEEE80211_DEV_UNREGISTERED;
4828 if (local->apdev)
4829 ieee80211_if_del_mgmt(local);
4830
4831 write_lock_bh(&local->sub_if_lock);
4832 list_replace_init(&local->sub_if_list, &tmp_list);
4833 write_unlock_bh(&local->sub_if_lock);
4834
4835 list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
4836 __ieee80211_if_del(local, sdata);
4837
4838 rtnl_unlock();
4839
4840 if (local->stat_time)
4841 del_timer_sync(&local->stat_timer);
4842
4843 ieee80211_rx_bss_list_deinit(local->mdev);
4844 ieee80211_clear_tx_pending(local);
4845 sta_info_stop(local);
4846 rate_control_deinitialize(local);
4847
4848 for (i = 0; i < NUM_IEEE80211_MODES; i++) {
4849 kfree(local->supp_rates[i]);
4850 kfree(local->basic_rates[i]);
4851 }
4852
4853 if (skb_queue_len(&local->skb_queue)
4854 || skb_queue_len(&local->skb_queue_unreliable))
4855 printk(KERN_WARNING "%s: skb_queue not empty\n",
4856 local->mdev->name);
4857 skb_queue_purge(&local->skb_queue);
4858 skb_queue_purge(&local->skb_queue_unreliable);
4859
4860 destroy_workqueue(local->hw.workqueue);
4861 wiphy_unregister(local->hw.wiphy);
4862 ieee80211_wep_free(local);
4863 ieee80211_led_exit(local);
4864 }
4865 EXPORT_SYMBOL(ieee80211_unregister_hw);
4866
4867 void ieee80211_free_hw(struct ieee80211_hw *hw)
4868 {
4869 struct ieee80211_local *local = hw_to_local(hw);
4870
4871 ieee80211_if_free(local->mdev);
4872 wiphy_free(local->hw.wiphy);
4873 }
4874 EXPORT_SYMBOL(ieee80211_free_hw);
4875
4876 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
4877 {
4878 struct ieee80211_local *local = hw_to_local(hw);
4879
4880 if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
4881 &local->state[queue])) {
4882 if (test_bit(IEEE80211_LINK_STATE_PENDING,
4883 &local->state[queue]))
4884 tasklet_schedule(&local->tx_pending_tasklet);
4885 else
4886 if (!ieee80211_qdisc_installed(local->mdev)) {
4887 if (queue == 0)
4888 netif_wake_queue(local->mdev);
4889 } else
4890 __netif_schedule(local->mdev);
4891 }
4892 }
4893 EXPORT_SYMBOL(ieee80211_wake_queue);
4894
4895 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
4896 {
4897 struct ieee80211_local *local = hw_to_local(hw);
4898
4899 if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
4900 netif_stop_queue(local->mdev);
4901 set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
4902 }
4903 EXPORT_SYMBOL(ieee80211_stop_queue);
4904
4905 void ieee80211_start_queues(struct ieee80211_hw *hw)
4906 {
4907 struct ieee80211_local *local = hw_to_local(hw);
4908 int i;
4909
4910 for (i = 0; i < local->hw.queues; i++)
4911 clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
4912 if (!ieee80211_qdisc_installed(local->mdev))
4913 netif_start_queue(local->mdev);
4914 }
4915 EXPORT_SYMBOL(ieee80211_start_queues);
4916
4917 void ieee80211_stop_queues(struct ieee80211_hw *hw)
4918 {
4919 int i;
4920
4921 for (i = 0; i < hw->queues; i++)
4922 ieee80211_stop_queue(hw, i);
4923 }
4924 EXPORT_SYMBOL(ieee80211_stop_queues);
4925
4926 void ieee80211_wake_queues(struct ieee80211_hw *hw)
4927 {
4928 int i;
4929
4930 for (i = 0; i < hw->queues; i++)
4931 ieee80211_wake_queue(hw, i);
4932 }
4933 EXPORT_SYMBOL(ieee80211_wake_queues);
4934
4935 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
4936 {
4937 struct ieee80211_sub_if_data *sdata;
4938 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4939 return &sdata->stats;
4940 }
4941
4942 static int __init ieee80211_init(void)
4943 {
4944 struct sk_buff *skb;
4945 int ret;
4946
4947 BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
4948
4949 ret = ieee80211_wme_register();
4950 if (ret) {
4951 printk(KERN_DEBUG "ieee80211_init: failed to "
4952 "initialize WME (err=%d)\n", ret);
4953 return ret;
4954 }
4955
4956 return 0;
4957 }
4958
4959
4960 static void __exit ieee80211_exit(void)
4961 {
4962 ieee80211_wme_unregister();
4963 }
4964
4965
4966 module_init(ieee80211_init);
4967 module_exit(ieee80211_exit);
4968
4969 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
4970 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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