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[PATCH] mac80211: remove ieee80211_set_aid_for_sta
[linux-2.6/libata-dev.git] / net / mac80211 / ieee80211.c
blob4bcf18097e53dcd81dc5a9426228623f1acf9ee5
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 #include <asm/unaligned.h>
28
29 #include "ieee80211_common.h"
30 #include "ieee80211_i.h"
31 #include "ieee80211_rate.h"
32 #include "wep.h"
33 #include "wpa.h"
34 #include "tkip.h"
35 #include "wme.h"
36 #include "aes_ccm.h"
37 #include "ieee80211_led.h"
38 #include "ieee80211_cfg.h"
39 #include "debugfs.h"
40 #include "debugfs_netdev.h"
41 #include "debugfs_key.h"
42
43 /* privid for wiphys to determine whether they belong to us or not */
44 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
45
46 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
47 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
48 static const unsigned char rfc1042_header[] =
49 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
50
51 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
52 static const unsigned char bridge_tunnel_header[] =
53 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
54
55 /* No encapsulation header if EtherType < 0x600 (=length) */
56 static const unsigned char eapol_header[] =
57 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x88, 0x8e };
58
59
60 /*
61 * For seeing transmitted packets on monitor interfaces
62 * we have a radiotap header too.
63 */
64 struct ieee80211_tx_status_rtap_hdr {
65 struct ieee80211_radiotap_header hdr;
66 __le16 tx_flags;
67 u8 data_retries;
68 } __attribute__ ((packed));
69
70
71 static inline void ieee80211_include_sequence(struct ieee80211_sub_if_data *sdata,
72 struct ieee80211_hdr *hdr)
73 {
74 /* Set the sequence number for this frame. */
75 hdr->seq_ctrl = cpu_to_le16(sdata->sequence);
76
77 /* Increase the sequence number. */
78 sdata->sequence = (sdata->sequence + 0x10) & IEEE80211_SCTL_SEQ;
79 }
80
81 struct ieee80211_key_conf *
82 ieee80211_key_data2conf(struct ieee80211_local *local,
83 const struct ieee80211_key *data)
84 {
85 struct ieee80211_key_conf *conf;
86
87 conf = kmalloc(sizeof(*conf) + data->keylen, GFP_ATOMIC);
88 if (!conf)
89 return NULL;
90
91 conf->hw_key_idx = data->hw_key_idx;
92 conf->alg = data->alg;
93 conf->keylen = data->keylen;
94 conf->flags = 0;
95 if (data->force_sw_encrypt)
96 conf->flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
97 conf->keyidx = data->keyidx;
98 if (data->default_tx_key)
99 conf->flags |= IEEE80211_KEY_DEFAULT_TX_KEY;
100 if (local->default_wep_only)
101 conf->flags |= IEEE80211_KEY_DEFAULT_WEP_ONLY;
102 memcpy(conf->key, data->key, data->keylen);
103
104 return conf;
105 }
106
107 struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
108 int idx, size_t key_len, gfp_t flags)
109 {
110 struct ieee80211_key *key;
111
112 key = kzalloc(sizeof(struct ieee80211_key) + key_len, flags);
113 if (!key)
114 return NULL;
115 kref_init(&key->kref);
116 return key;
117 }
118
119 static void ieee80211_key_release(struct kref *kref)
120 {
121 struct ieee80211_key *key;
122
123 key = container_of(kref, struct ieee80211_key, kref);
124 if (key->alg == ALG_CCMP)
125 ieee80211_aes_key_free(key->u.ccmp.tfm);
126 ieee80211_debugfs_key_remove(key);
127 kfree(key);
128 }
129
130 void ieee80211_key_free(struct ieee80211_key *key)
131 {
132 if (key)
133 kref_put(&key->kref, ieee80211_key_release);
134 }
135
136 static int rate_list_match(const int *rate_list, int rate)
137 {
138 int i;
139
140 if (!rate_list)
141 return 0;
142
143 for (i = 0; rate_list[i] >= 0; i++)
144 if (rate_list[i] == rate)
145 return 1;
146
147 return 0;
148 }
149
150
151 void ieee80211_prepare_rates(struct ieee80211_local *local,
152 struct ieee80211_hw_mode *mode)
153 {
154 int i;
155
156 for (i = 0; i < mode->num_rates; i++) {
157 struct ieee80211_rate *rate = &mode->rates[i];
158
159 rate->flags &= ~(IEEE80211_RATE_SUPPORTED |
160 IEEE80211_RATE_BASIC);
161
162 if (local->supp_rates[mode->mode]) {
163 if (!rate_list_match(local->supp_rates[mode->mode],
164 rate->rate))
165 continue;
166 }
167
168 rate->flags |= IEEE80211_RATE_SUPPORTED;
169
170 /* Use configured basic rate set if it is available. If not,
171 * use defaults that are sane for most cases. */
172 if (local->basic_rates[mode->mode]) {
173 if (rate_list_match(local->basic_rates[mode->mode],
174 rate->rate))
175 rate->flags |= IEEE80211_RATE_BASIC;
176 } else switch (mode->mode) {
177 case MODE_IEEE80211A:
178 if (rate->rate == 60 || rate->rate == 120 ||
179 rate->rate == 240)
180 rate->flags |= IEEE80211_RATE_BASIC;
181 break;
182 case MODE_IEEE80211B:
183 if (rate->rate == 10 || rate->rate == 20)
184 rate->flags |= IEEE80211_RATE_BASIC;
185 break;
186 case MODE_ATHEROS_TURBO:
187 if (rate->rate == 120 || rate->rate == 240 ||
188 rate->rate == 480)
189 rate->flags |= IEEE80211_RATE_BASIC;
190 break;
191 case MODE_IEEE80211G:
192 if (rate->rate == 10 || rate->rate == 20 ||
193 rate->rate == 55 || rate->rate == 110)
194 rate->flags |= IEEE80211_RATE_BASIC;
195 break;
196 }
197
198 /* Set ERP and MANDATORY flags based on phymode */
199 switch (mode->mode) {
200 case MODE_IEEE80211A:
201 if (rate->rate == 60 || rate->rate == 120 ||
202 rate->rate == 240)
203 rate->flags |= IEEE80211_RATE_MANDATORY;
204 break;
205 case MODE_IEEE80211B:
206 if (rate->rate == 10)
207 rate->flags |= IEEE80211_RATE_MANDATORY;
208 break;
209 case MODE_ATHEROS_TURBO:
210 break;
211 case MODE_IEEE80211G:
212 if (rate->rate == 10 || rate->rate == 20 ||
213 rate->rate == 55 || rate->rate == 110 ||
214 rate->rate == 60 || rate->rate == 120 ||
215 rate->rate == 240)
216 rate->flags |= IEEE80211_RATE_MANDATORY;
217 break;
218 }
219 if (ieee80211_is_erp_rate(mode->mode, rate->rate))
220 rate->flags |= IEEE80211_RATE_ERP;
221 }
222 }
223
224
225 static void ieee80211_key_threshold_notify(struct net_device *dev,
226 struct ieee80211_key *key,
227 struct sta_info *sta)
228 {
229 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
230 struct sk_buff *skb;
231 struct ieee80211_msg_key_notification *msg;
232
233 /* if no one will get it anyway, don't even allocate it.
234 * unlikely because this is only relevant for APs
235 * where the device must be open... */
236 if (unlikely(!local->apdev))
237 return;
238
239 skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
240 sizeof(struct ieee80211_msg_key_notification));
241 if (!skb)
242 return;
243
244 skb_reserve(skb, sizeof(struct ieee80211_frame_info));
245 msg = (struct ieee80211_msg_key_notification *)
246 skb_put(skb, sizeof(struct ieee80211_msg_key_notification));
247 msg->tx_rx_count = key->tx_rx_count;
248 memcpy(msg->ifname, dev->name, IFNAMSIZ);
249 if (sta)
250 memcpy(msg->addr, sta->addr, ETH_ALEN);
251 else
252 memset(msg->addr, 0xff, ETH_ALEN);
253
254 key->tx_rx_count = 0;
255
256 ieee80211_rx_mgmt(local, skb, NULL,
257 ieee80211_msg_key_threshold_notification);
258 }
259
260
261 static u8 * ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len)
262 {
263 u16 fc;
264
265 if (len < 24)
266 return NULL;
267
268 fc = le16_to_cpu(hdr->frame_control);
269
270 switch (fc & IEEE80211_FCTL_FTYPE) {
271 case IEEE80211_FTYPE_DATA:
272 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
273 case IEEE80211_FCTL_TODS:
274 return hdr->addr1;
275 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
276 return NULL;
277 case IEEE80211_FCTL_FROMDS:
278 return hdr->addr2;
279 case 0:
280 return hdr->addr3;
281 }
282 break;
283 case IEEE80211_FTYPE_MGMT:
284 return hdr->addr3;
285 case IEEE80211_FTYPE_CTL:
286 if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)
287 return hdr->addr1;
288 else
289 return NULL;
290 }
291
292 return NULL;
293 }
294
295 int ieee80211_get_hdrlen(u16 fc)
296 {
297 int hdrlen = 24;
298
299 switch (fc & IEEE80211_FCTL_FTYPE) {
300 case IEEE80211_FTYPE_DATA:
301 if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
302 hdrlen = 30; /* Addr4 */
303 /*
304 * The QoS Control field is two bytes and its presence is
305 * indicated by the IEEE80211_STYPE_QOS_DATA bit. Add 2 to
306 * hdrlen if that bit is set.
307 * This works by masking out the bit and shifting it to
308 * bit position 1 so the result has the value 0 or 2.
309 */
310 hdrlen += (fc & IEEE80211_STYPE_QOS_DATA)
311 >> (ilog2(IEEE80211_STYPE_QOS_DATA)-1);
312 break;
313 case IEEE80211_FTYPE_CTL:
314 /*
315 * ACK and CTS are 10 bytes, all others 16. To see how
316 * to get this condition consider
317 * subtype mask: 0b0000000011110000 (0x00F0)
318 * ACK subtype: 0b0000000011010000 (0x00D0)
319 * CTS subtype: 0b0000000011000000 (0x00C0)
320 * bits that matter: ^^^ (0x00E0)
321 * value of those: 0b0000000011000000 (0x00C0)
322 */
323 if ((fc & 0xE0) == 0xC0)
324 hdrlen = 10;
325 else
326 hdrlen = 16;
327 break;
328 }
329
330 return hdrlen;
331 }
332 EXPORT_SYMBOL(ieee80211_get_hdrlen);
333
334 int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
335 {
336 const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *) skb->data;
337 int hdrlen;
338
339 if (unlikely(skb->len < 10))
340 return 0;
341 hdrlen = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
342 if (unlikely(hdrlen > skb->len))
343 return 0;
344 return hdrlen;
345 }
346 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
347
348 static int ieee80211_get_radiotap_len(struct sk_buff *skb)
349 {
350 struct ieee80211_radiotap_header *hdr =
351 (struct ieee80211_radiotap_header *) skb->data;
352
353 return le16_to_cpu(hdr->it_len);
354 }
355
356 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP
357 static void ieee80211_dump_frame(const char *ifname, const char *title,
358 const struct sk_buff *skb)
359 {
360 const struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
361 u16 fc;
362 int hdrlen;
363
364 printk(KERN_DEBUG "%s: %s (len=%d)", ifname, title, skb->len);
365 if (skb->len < 4) {
366 printk("\n");
367 return;
368 }
369
370 fc = le16_to_cpu(hdr->frame_control);
371 hdrlen = ieee80211_get_hdrlen(fc);
372 if (hdrlen > skb->len)
373 hdrlen = skb->len;
374 if (hdrlen >= 4)
375 printk(" FC=0x%04x DUR=0x%04x",
376 fc, le16_to_cpu(hdr->duration_id));
377 if (hdrlen >= 10)
378 printk(" A1=" MAC_FMT, MAC_ARG(hdr->addr1));
379 if (hdrlen >= 16)
380 printk(" A2=" MAC_FMT, MAC_ARG(hdr->addr2));
381 if (hdrlen >= 24)
382 printk(" A3=" MAC_FMT, MAC_ARG(hdr->addr3));
383 if (hdrlen >= 30)
384 printk(" A4=" MAC_FMT, MAC_ARG(hdr->addr4));
385 printk("\n");
386 }
387 #else /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
388 static inline void ieee80211_dump_frame(const char *ifname, const char *title,
389 struct sk_buff *skb)
390 {
391 }
392 #endif /* CONFIG_MAC80211_LOWTX_FRAME_DUMP */
393
394
395 static int ieee80211_is_eapol(const struct sk_buff *skb)
396 {
397 const struct ieee80211_hdr *hdr;
398 u16 fc;
399 int hdrlen;
400
401 if (unlikely(skb->len < 10))
402 return 0;
403
404 hdr = (const struct ieee80211_hdr *) skb->data;
405 fc = le16_to_cpu(hdr->frame_control);
406
407 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
408 return 0;
409
410 hdrlen = ieee80211_get_hdrlen(fc);
411
412 if (unlikely(skb->len >= hdrlen + sizeof(eapol_header) &&
413 memcmp(skb->data + hdrlen, eapol_header,
414 sizeof(eapol_header)) == 0))
415 return 1;
416
417 return 0;
418 }
419
420
421 static ieee80211_txrx_result
422 ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
423 {
424 struct rate_control_extra extra;
425
426 memset(&extra, 0, sizeof(extra));
427 extra.mode = tx->u.tx.mode;
428 extra.mgmt_data = tx->sdata &&
429 tx->sdata->type == IEEE80211_IF_TYPE_MGMT;
430 extra.ethertype = tx->ethertype;
431
432 tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev, tx->skb,
433 &extra);
434 if (unlikely(extra.probe != NULL)) {
435 tx->u.tx.control->flags |= IEEE80211_TXCTL_RATE_CTRL_PROBE;
436 tx->u.tx.probe_last_frag = 1;
437 tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
438 tx->u.tx.rate = extra.probe;
439 } else {
440 tx->u.tx.control->alt_retry_rate = -1;
441 }
442 if (!tx->u.tx.rate)
443 return TXRX_DROP;
444 if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
445 tx->local->cts_protect_erp_frames && tx->fragmented &&
446 extra.nonerp) {
447 tx->u.tx.last_frag_rate = tx->u.tx.rate;
448 tx->u.tx.probe_last_frag = extra.probe ? 1 : 0;
449
450 tx->u.tx.rate = extra.nonerp;
451 tx->u.tx.control->rate = extra.nonerp;
452 tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
453 } else {
454 tx->u.tx.last_frag_rate = tx->u.tx.rate;
455 tx->u.tx.control->rate = tx->u.tx.rate;
456 }
457 tx->u.tx.control->tx_rate = tx->u.tx.rate->val;
458 if ((tx->u.tx.rate->flags & IEEE80211_RATE_PREAMBLE2) &&
459 tx->local->short_preamble &&
460 (!tx->sta || (tx->sta->flags & WLAN_STA_SHORT_PREAMBLE))) {
461 tx->u.tx.short_preamble = 1;
462 tx->u.tx.control->tx_rate = tx->u.tx.rate->val2;
463 }
464
465 return TXRX_CONTINUE;
466 }
467
468
469 static ieee80211_txrx_result
470 ieee80211_tx_h_select_key(struct ieee80211_txrx_data *tx)
471 {
472 if (tx->sta)
473 tx->u.tx.control->key_idx = tx->sta->key_idx_compression;
474 else
475 tx->u.tx.control->key_idx = HW_KEY_IDX_INVALID;
476
477 if (unlikely(tx->u.tx.control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
478 tx->key = NULL;
479 else if (tx->sta && tx->sta->key)
480 tx->key = tx->sta->key;
481 else if (tx->sdata->default_key)
482 tx->key = tx->sdata->default_key;
483 else if (tx->sdata->drop_unencrypted &&
484 !(tx->sdata->eapol && ieee80211_is_eapol(tx->skb))) {
485 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
486 return TXRX_DROP;
487 } else
488 tx->key = NULL;
489
490 if (tx->key) {
491 tx->key->tx_rx_count++;
492 if (unlikely(tx->local->key_tx_rx_threshold &&
493 tx->key->tx_rx_count >
494 tx->local->key_tx_rx_threshold)) {
495 ieee80211_key_threshold_notify(tx->dev, tx->key,
496 tx->sta);
497 }
498 }
499
500 return TXRX_CONTINUE;
501 }
502
503
504 static ieee80211_txrx_result
505 ieee80211_tx_h_fragment(struct ieee80211_txrx_data *tx)
506 {
507 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
508 size_t hdrlen, per_fragm, num_fragm, payload_len, left;
509 struct sk_buff **frags, *first, *frag;
510 int i;
511 u16 seq;
512 u8 *pos;
513 int frag_threshold = tx->local->fragmentation_threshold;
514
515 if (!tx->fragmented)
516 return TXRX_CONTINUE;
517
518 first = tx->skb;
519
520 hdrlen = ieee80211_get_hdrlen(tx->fc);
521 payload_len = first->len - hdrlen;
522 per_fragm = frag_threshold - hdrlen - FCS_LEN;
523 num_fragm = (payload_len + per_fragm - 1) / per_fragm;
524
525 frags = kzalloc(num_fragm * sizeof(struct sk_buff *), GFP_ATOMIC);
526 if (!frags)
527 goto fail;
528
529 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
530 seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
531 pos = first->data + hdrlen + per_fragm;
532 left = payload_len - per_fragm;
533 for (i = 0; i < num_fragm - 1; i++) {
534 struct ieee80211_hdr *fhdr;
535 size_t copylen;
536
537 if (left <= 0)
538 goto fail;
539
540 /* reserve enough extra head and tail room for possible
541 * encryption */
542 frag = frags[i] =
543 dev_alloc_skb(tx->local->tx_headroom +
544 frag_threshold +
545 IEEE80211_ENCRYPT_HEADROOM +
546 IEEE80211_ENCRYPT_TAILROOM);
547 if (!frag)
548 goto fail;
549 /* Make sure that all fragments use the same priority so
550 * that they end up using the same TX queue */
551 frag->priority = first->priority;
552 skb_reserve(frag, tx->local->tx_headroom +
553 IEEE80211_ENCRYPT_HEADROOM);
554 fhdr = (struct ieee80211_hdr *) skb_put(frag, hdrlen);
555 memcpy(fhdr, first->data, hdrlen);
556 if (i == num_fragm - 2)
557 fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
558 fhdr->seq_ctrl = cpu_to_le16(seq | ((i + 1) & IEEE80211_SCTL_FRAG));
559 copylen = left > per_fragm ? per_fragm : left;
560 memcpy(skb_put(frag, copylen), pos, copylen);
561
562 pos += copylen;
563 left -= copylen;
564 }
565 skb_trim(first, hdrlen + per_fragm);
566
567 tx->u.tx.num_extra_frag = num_fragm - 1;
568 tx->u.tx.extra_frag = frags;
569
570 return TXRX_CONTINUE;
571
572 fail:
573 printk(KERN_DEBUG "%s: failed to fragment frame\n", tx->dev->name);
574 if (frags) {
575 for (i = 0; i < num_fragm - 1; i++)
576 if (frags[i])
577 dev_kfree_skb(frags[i]);
578 kfree(frags);
579 }
580 I802_DEBUG_INC(tx->local->tx_handlers_drop_fragment);
581 return TXRX_DROP;
582 }
583
584
585 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
586 {
587 if (tx->key->force_sw_encrypt) {
588 if (ieee80211_wep_encrypt(tx->local, skb, tx->key))
589 return -1;
590 } else {
591 tx->u.tx.control->key_idx = tx->key->hw_key_idx;
592 if (tx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
593 if (ieee80211_wep_add_iv(tx->local, skb, tx->key) ==
594 NULL)
595 return -1;
596 }
597 }
598 return 0;
599 }
600
601
602 void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx)
603 {
604 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
605
606 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
607 if (tx->u.tx.extra_frag) {
608 struct ieee80211_hdr *fhdr;
609 int i;
610 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
611 fhdr = (struct ieee80211_hdr *)
612 tx->u.tx.extra_frag[i]->data;
613 fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
614 }
615 }
616 }
617
618
619 static ieee80211_txrx_result
620 ieee80211_tx_h_wep_encrypt(struct ieee80211_txrx_data *tx)
621 {
622 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
623 u16 fc;
624
625 fc = le16_to_cpu(hdr->frame_control);
626
627 if (!tx->key || tx->key->alg != ALG_WEP ||
628 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
629 ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
630 (fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
631 return TXRX_CONTINUE;
632
633 tx->u.tx.control->iv_len = WEP_IV_LEN;
634 tx->u.tx.control->icv_len = WEP_ICV_LEN;
635 ieee80211_tx_set_iswep(tx);
636
637 if (wep_encrypt_skb(tx, tx->skb) < 0) {
638 I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
639 return TXRX_DROP;
640 }
641
642 if (tx->u.tx.extra_frag) {
643 int i;
644 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
645 if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
646 I802_DEBUG_INC(tx->local->
647 tx_handlers_drop_wep);
648 return TXRX_DROP;
649 }
650 }
651 }
652
653 return TXRX_CONTINUE;
654 }
655
656
657 static int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
658 int rate, int erp, int short_preamble)
659 {
660 int dur;
661
662 /* calculate duration (in microseconds, rounded up to next higher
663 * integer if it includes a fractional microsecond) to send frame of
664 * len bytes (does not include FCS) at the given rate. Duration will
665 * also include SIFS.
666 *
667 * rate is in 100 kbps, so divident is multiplied by 10 in the
668 * DIV_ROUND_UP() operations.
669 */
670
671 if (local->hw.conf.phymode == MODE_IEEE80211A || erp ||
672 local->hw.conf.phymode == MODE_ATHEROS_TURBO) {
673 /*
674 * OFDM:
675 *
676 * N_DBPS = DATARATE x 4
677 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
678 * (16 = SIGNAL time, 6 = tail bits)
679 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
680 *
681 * T_SYM = 4 usec
682 * 802.11a - 17.5.2: aSIFSTime = 16 usec
683 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
684 * signal ext = 6 usec
685 */
686 /* FIX: Atheros Turbo may have different (shorter) duration? */
687 dur = 16; /* SIFS + signal ext */
688 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
689 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
690 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
691 4 * rate); /* T_SYM x N_SYM */
692 } else {
693 /*
694 * 802.11b or 802.11g with 802.11b compatibility:
695 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
696 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
697 *
698 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
699 * aSIFSTime = 10 usec
700 * aPreambleLength = 144 usec or 72 usec with short preamble
701 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
702 */
703 dur = 10; /* aSIFSTime = 10 usec */
704 dur += short_preamble ? (72 + 24) : (144 + 48);
705
706 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
707 }
708
709 return dur;
710 }
711
712
713 /* Exported duration function for driver use */
714 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
715 size_t frame_len, int rate)
716 {
717 struct ieee80211_local *local = hw_to_local(hw);
718 u16 dur;
719 int erp;
720
721 erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
722 dur = ieee80211_frame_duration(local, frame_len, rate,
723 erp, local->short_preamble);
724
725 return cpu_to_le16(dur);
726 }
727 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
728
729
730 static u16 ieee80211_duration(struct ieee80211_txrx_data *tx, int group_addr,
731 int next_frag_len)
732 {
733 int rate, mrate, erp, dur, i;
734 struct ieee80211_rate *txrate = tx->u.tx.rate;
735 struct ieee80211_local *local = tx->local;
736 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
737
738 erp = txrate->flags & IEEE80211_RATE_ERP;
739
740 /*
741 * data and mgmt (except PS Poll):
742 * - during CFP: 32768
743 * - during contention period:
744 * if addr1 is group address: 0
745 * if more fragments = 0 and addr1 is individual address: time to
746 * transmit one ACK plus SIFS
747 * if more fragments = 1 and addr1 is individual address: time to
748 * transmit next fragment plus 2 x ACK plus 3 x SIFS
749 *
750 * IEEE 802.11, 9.6:
751 * - control response frame (CTS or ACK) shall be transmitted using the
752 * same rate as the immediately previous frame in the frame exchange
753 * sequence, if this rate belongs to the PHY mandatory rates, or else
754 * at the highest possible rate belonging to the PHY rates in the
755 * BSSBasicRateSet
756 */
757
758 if ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) {
759 /* TODO: These control frames are not currently sent by
760 * 80211.o, but should they be implemented, this function
761 * needs to be updated to support duration field calculation.
762 *
763 * RTS: time needed to transmit pending data/mgmt frame plus
764 * one CTS frame plus one ACK frame plus 3 x SIFS
765 * CTS: duration of immediately previous RTS minus time
766 * required to transmit CTS and its SIFS
767 * ACK: 0 if immediately previous directed data/mgmt had
768 * more=0, with more=1 duration in ACK frame is duration
769 * from previous frame minus time needed to transmit ACK
770 * and its SIFS
771 * PS Poll: BIT(15) | BIT(14) | aid
772 */
773 return 0;
774 }
775
776 /* data/mgmt */
777 if (0 /* FIX: data/mgmt during CFP */)
778 return 32768;
779
780 if (group_addr) /* Group address as the destination - no ACK */
781 return 0;
782
783 /* Individual destination address:
784 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
785 * CTS and ACK frames shall be transmitted using the highest rate in
786 * basic rate set that is less than or equal to the rate of the
787 * immediately previous frame and that is using the same modulation
788 * (CCK or OFDM). If no basic rate set matches with these requirements,
789 * the highest mandatory rate of the PHY that is less than or equal to
790 * the rate of the previous frame is used.
791 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
792 */
793 rate = -1;
794 mrate = 10; /* use 1 Mbps if everything fails */
795 for (i = 0; i < mode->num_rates; i++) {
796 struct ieee80211_rate *r = &mode->rates[i];
797 if (r->rate > txrate->rate)
798 break;
799
800 if (IEEE80211_RATE_MODULATION(txrate->flags) !=
801 IEEE80211_RATE_MODULATION(r->flags))
802 continue;
803
804 if (r->flags & IEEE80211_RATE_BASIC)
805 rate = r->rate;
806 else if (r->flags & IEEE80211_RATE_MANDATORY)
807 mrate = r->rate;
808 }
809 if (rate == -1) {
810 /* No matching basic rate found; use highest suitable mandatory
811 * PHY rate */
812 rate = mrate;
813 }
814
815 /* Time needed to transmit ACK
816 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
817 * to closest integer */
818
819 dur = ieee80211_frame_duration(local, 10, rate, erp,
820 local->short_preamble);
821
822 if (next_frag_len) {
823 /* Frame is fragmented: duration increases with time needed to
824 * transmit next fragment plus ACK and 2 x SIFS. */
825 dur *= 2; /* ACK + SIFS */
826 /* next fragment */
827 dur += ieee80211_frame_duration(local, next_frag_len,
828 txrate->rate, erp,
829 local->short_preamble);
830 }
831
832 return dur;
833 }
834
835
836 static ieee80211_txrx_result
837 ieee80211_tx_h_misc(struct ieee80211_txrx_data *tx)
838 {
839 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
840 u16 dur;
841 struct ieee80211_tx_control *control = tx->u.tx.control;
842 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
843
844 if (!is_multicast_ether_addr(hdr->addr1)) {
845 if (tx->skb->len + FCS_LEN > tx->local->rts_threshold &&
846 tx->local->rts_threshold < IEEE80211_MAX_RTS_THRESHOLD) {
847 control->flags |= IEEE80211_TXCTL_USE_RTS_CTS;
848 control->retry_limit =
849 tx->local->long_retry_limit;
850 } else {
851 control->retry_limit =
852 tx->local->short_retry_limit;
853 }
854 } else {
855 control->retry_limit = 1;
856 }
857
858 if (tx->fragmented) {
859 /* Do not use multiple retry rates when sending fragmented
860 * frames.
861 * TODO: The last fragment could still use multiple retry
862 * rates. */
863 control->alt_retry_rate = -1;
864 }
865
866 /* Use CTS protection for unicast frames sent using extended rates if
867 * there are associated non-ERP stations and RTS/CTS is not configured
868 * for the frame. */
869 if (mode->mode == MODE_IEEE80211G &&
870 (tx->u.tx.rate->flags & IEEE80211_RATE_ERP) &&
871 tx->u.tx.unicast &&
872 tx->local->cts_protect_erp_frames &&
873 !(control->flags & IEEE80211_TXCTL_USE_RTS_CTS))
874 control->flags |= IEEE80211_TXCTL_USE_CTS_PROTECT;
875
876 /* Setup duration field for the first fragment of the frame. Duration
877 * for remaining fragments will be updated when they are being sent
878 * to low-level driver in ieee80211_tx(). */
879 dur = ieee80211_duration(tx, is_multicast_ether_addr(hdr->addr1),
880 tx->fragmented ? tx->u.tx.extra_frag[0]->len :
881 0);
882 hdr->duration_id = cpu_to_le16(dur);
883
884 if ((control->flags & IEEE80211_TXCTL_USE_RTS_CTS) ||
885 (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)) {
886 struct ieee80211_rate *rate;
887
888 /* Do not use multiple retry rates when using RTS/CTS */
889 control->alt_retry_rate = -1;
890
891 /* Use min(data rate, max base rate) as CTS/RTS rate */
892 rate = tx->u.tx.rate;
893 while (rate > mode->rates &&
894 !(rate->flags & IEEE80211_RATE_BASIC))
895 rate--;
896
897 control->rts_cts_rate = rate->val;
898 control->rts_rate = rate;
899 }
900
901 if (tx->sta) {
902 tx->sta->tx_packets++;
903 tx->sta->tx_fragments++;
904 tx->sta->tx_bytes += tx->skb->len;
905 if (tx->u.tx.extra_frag) {
906 int i;
907 tx->sta->tx_fragments += tx->u.tx.num_extra_frag;
908 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
909 tx->sta->tx_bytes +=
910 tx->u.tx.extra_frag[i]->len;
911 }
912 }
913 }
914
915 return TXRX_CONTINUE;
916 }
917
918
919 static ieee80211_txrx_result
920 ieee80211_tx_h_check_assoc(struct ieee80211_txrx_data *tx)
921 {
922 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
923 struct sk_buff *skb = tx->skb;
924 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
925 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
926 u32 sta_flags;
927
928 if (unlikely(tx->local->sta_scanning != 0) &&
929 ((tx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
930 (tx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PROBE_REQ))
931 return TXRX_DROP;
932
933 if (tx->u.tx.ps_buffered)
934 return TXRX_CONTINUE;
935
936 sta_flags = tx->sta ? tx->sta->flags : 0;
937
938 if (likely(tx->u.tx.unicast)) {
939 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
940 tx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
941 (tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)) {
942 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
943 printk(KERN_DEBUG "%s: dropped data frame to not "
944 "associated station " MAC_FMT "\n",
945 tx->dev->name, MAC_ARG(hdr->addr1));
946 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
947 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
948 return TXRX_DROP;
949 }
950 } else {
951 if (unlikely((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
952 tx->local->num_sta == 0 &&
953 !tx->local->allow_broadcast_always &&
954 tx->sdata->type != IEEE80211_IF_TYPE_IBSS)) {
955 /*
956 * No associated STAs - no need to send multicast
957 * frames.
958 */
959 return TXRX_DROP;
960 }
961 return TXRX_CONTINUE;
962 }
963
964 if (unlikely(!tx->u.tx.mgmt_interface && tx->sdata->ieee802_1x &&
965 !(sta_flags & WLAN_STA_AUTHORIZED))) {
966 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
967 printk(KERN_DEBUG "%s: dropped frame to " MAC_FMT
968 " (unauthorized port)\n", tx->dev->name,
969 MAC_ARG(hdr->addr1));
970 #endif
971 I802_DEBUG_INC(tx->local->tx_handlers_drop_unauth_port);
972 return TXRX_DROP;
973 }
974
975 return TXRX_CONTINUE;
976 }
977
978 static ieee80211_txrx_result
979 ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
980 {
981 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
982
983 if (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) >= 24)
984 ieee80211_include_sequence(tx->sdata, hdr);
985
986 return TXRX_CONTINUE;
987 }
988
989 /* This function is called whenever the AP is about to exceed the maximum limit
990 * of buffered frames for power saving STAs. This situation should not really
991 * happen often during normal operation, so dropping the oldest buffered packet
992 * from each queue should be OK to make some room for new frames. */
993 static void purge_old_ps_buffers(struct ieee80211_local *local)
994 {
995 int total = 0, purged = 0;
996 struct sk_buff *skb;
997 struct ieee80211_sub_if_data *sdata;
998 struct sta_info *sta;
999
1000 read_lock(&local->sub_if_lock);
1001 list_for_each_entry(sdata, &local->sub_if_list, list) {
1002 struct ieee80211_if_ap *ap;
1003 if (sdata->dev == local->mdev ||
1004 sdata->type != IEEE80211_IF_TYPE_AP)
1005 continue;
1006 ap = &sdata->u.ap;
1007 skb = skb_dequeue(&ap->ps_bc_buf);
1008 if (skb) {
1009 purged++;
1010 dev_kfree_skb(skb);
1011 }
1012 total += skb_queue_len(&ap->ps_bc_buf);
1013 }
1014 read_unlock(&local->sub_if_lock);
1015
1016 spin_lock_bh(&local->sta_lock);
1017 list_for_each_entry(sta, &local->sta_list, list) {
1018 skb = skb_dequeue(&sta->ps_tx_buf);
1019 if (skb) {
1020 purged++;
1021 dev_kfree_skb(skb);
1022 }
1023 total += skb_queue_len(&sta->ps_tx_buf);
1024 }
1025 spin_unlock_bh(&local->sta_lock);
1026
1027 local->total_ps_buffered = total;
1028 printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
1029 local->mdev->name, purged);
1030 }
1031
1032
1033 static inline ieee80211_txrx_result
1034 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_txrx_data *tx)
1035 {
1036 /* broadcast/multicast frame */
1037 /* If any of the associated stations is in power save mode,
1038 * the frame is buffered to be sent after DTIM beacon frame */
1039 if ((tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING) &&
1040 tx->sdata->type != IEEE80211_IF_TYPE_WDS &&
1041 tx->sdata->bss && atomic_read(&tx->sdata->bss->num_sta_ps) &&
1042 !(tx->fc & IEEE80211_FCTL_ORDER)) {
1043 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1044 purge_old_ps_buffers(tx->local);
1045 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >=
1046 AP_MAX_BC_BUFFER) {
1047 if (net_ratelimit()) {
1048 printk(KERN_DEBUG "%s: BC TX buffer full - "
1049 "dropping the oldest frame\n",
1050 tx->dev->name);
1051 }
1052 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
1053 } else
1054 tx->local->total_ps_buffered++;
1055 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
1056 return TXRX_QUEUED;
1057 }
1058
1059 return TXRX_CONTINUE;
1060 }
1061
1062
1063 static inline ieee80211_txrx_result
1064 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_txrx_data *tx)
1065 {
1066 struct sta_info *sta = tx->sta;
1067
1068 if (unlikely(!sta ||
1069 ((tx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT &&
1070 (tx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)))
1071 return TXRX_CONTINUE;
1072
1073 if (unlikely((sta->flags & WLAN_STA_PS) && !sta->pspoll)) {
1074 struct ieee80211_tx_packet_data *pkt_data;
1075 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1076 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS buffer (entries "
1077 "before %d)\n",
1078 MAC_ARG(sta->addr), sta->aid,
1079 skb_queue_len(&sta->ps_tx_buf));
1080 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1081 sta->flags |= WLAN_STA_TIM;
1082 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
1083 purge_old_ps_buffers(tx->local);
1084 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
1085 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
1086 if (net_ratelimit()) {
1087 printk(KERN_DEBUG "%s: STA " MAC_FMT " TX "
1088 "buffer full - dropping oldest frame\n",
1089 tx->dev->name, MAC_ARG(sta->addr));
1090 }
1091 dev_kfree_skb(old);
1092 } else
1093 tx->local->total_ps_buffered++;
1094 /* Queue frame to be sent after STA sends an PS Poll frame */
1095 if (skb_queue_empty(&sta->ps_tx_buf)) {
1096 if (tx->local->ops->set_tim)
1097 tx->local->ops->set_tim(local_to_hw(tx->local),
1098 sta->aid, 1);
1099 if (tx->sdata->bss)
1100 bss_tim_set(tx->local, tx->sdata->bss, sta->aid);
1101 }
1102 pkt_data = (struct ieee80211_tx_packet_data *)tx->skb->cb;
1103 pkt_data->jiffies = jiffies;
1104 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
1105 return TXRX_QUEUED;
1106 }
1107 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1108 else if (unlikely(sta->flags & WLAN_STA_PS)) {
1109 printk(KERN_DEBUG "%s: STA " MAC_FMT " in PS mode, but pspoll "
1110 "set -> send frame\n", tx->dev->name,
1111 MAC_ARG(sta->addr));
1112 }
1113 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1114 sta->pspoll = 0;
1115
1116 return TXRX_CONTINUE;
1117 }
1118
1119
1120 static ieee80211_txrx_result
1121 ieee80211_tx_h_ps_buf(struct ieee80211_txrx_data *tx)
1122 {
1123 if (unlikely(tx->u.tx.ps_buffered))
1124 return TXRX_CONTINUE;
1125
1126 if (tx->u.tx.unicast)
1127 return ieee80211_tx_h_unicast_ps_buf(tx);
1128 else
1129 return ieee80211_tx_h_multicast_ps_buf(tx);
1130 }
1131
1132
1133 /*
1134 * deal with packet injection down monitor interface
1135 * with Radiotap Header -- only called for monitor mode interface
1136 */
1137
1138 static ieee80211_txrx_result
1139 __ieee80211_parse_tx_radiotap(
1140 struct ieee80211_txrx_data *tx,
1141 struct sk_buff *skb, struct ieee80211_tx_control *control)
1142 {
1143 /*
1144 * this is the moment to interpret and discard the radiotap header that
1145 * must be at the start of the packet injected in Monitor mode
1146 *
1147 * Need to take some care with endian-ness since radiotap
1148 * args are little-endian
1149 */
1150
1151 struct ieee80211_radiotap_iterator iterator;
1152 struct ieee80211_radiotap_header *rthdr =
1153 (struct ieee80211_radiotap_header *) skb->data;
1154 struct ieee80211_hw_mode *mode = tx->local->hw.conf.mode;
1155 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);
1156
1157 /*
1158 * default control situation for all injected packets
1159 * FIXME: this does not suit all usage cases, expand to allow control
1160 */
1161
1162 control->retry_limit = 1; /* no retry */
1163 control->key_idx = -1; /* no encryption key */
1164 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1165 IEEE80211_TXCTL_USE_CTS_PROTECT);
1166 control->flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT |
1167 IEEE80211_TXCTL_NO_ACK;
1168 control->antenna_sel_tx = 0; /* default to default antenna */
1169
1170 /*
1171 * for every radiotap entry that is present
1172 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1173 * entries present, or -EINVAL on error)
1174 */
1175
1176 while (!ret) {
1177 int i, target_rate;
1178
1179 ret = ieee80211_radiotap_iterator_next(&iterator);
1180
1181 if (ret)
1182 continue;
1183
1184 /* see if this argument is something we can use */
1185 switch (iterator.this_arg_index) {
1186 /*
1187 * You must take care when dereferencing iterator.this_arg
1188 * for multibyte types... the pointer is not aligned. Use
1189 * get_unaligned((type *)iterator.this_arg) to dereference
1190 * iterator.this_arg for type "type" safely on all arches.
1191 */
1192 case IEEE80211_RADIOTAP_RATE:
1193 /*
1194 * radiotap rate u8 is in 500kbps units eg, 0x02=1Mbps
1195 * ieee80211 rate int is in 100kbps units eg, 0x0a=1Mbps
1196 */
1197 target_rate = (*iterator.this_arg) * 5;
1198 for (i = 0; i < mode->num_rates; i++) {
1199 struct ieee80211_rate *r = &mode->rates[i];
1200
1201 if (r->rate > target_rate)
1202 continue;
1203
1204 control->rate = r;
1205
1206 if (r->flags & IEEE80211_RATE_PREAMBLE2)
1207 control->tx_rate = r->val2;
1208 else
1209 control->tx_rate = r->val;
1210
1211 /* end on exact match */
1212 if (r->rate == target_rate)
1213 i = mode->num_rates;
1214 }
1215 break;
1216
1217 case IEEE80211_RADIOTAP_ANTENNA:
1218 /*
1219 * radiotap uses 0 for 1st ant, mac80211 is 1 for
1220 * 1st ant
1221 */
1222 control->antenna_sel_tx = (*iterator.this_arg) + 1;
1223 break;
1224
1225 case IEEE80211_RADIOTAP_DBM_TX_POWER:
1226 control->power_level = *iterator.this_arg;
1227 break;
1228
1229 case IEEE80211_RADIOTAP_FLAGS:
1230 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1231 /*
1232 * this indicates that the skb we have been
1233 * handed has the 32-bit FCS CRC at the end...
1234 * we should react to that by snipping it off
1235 * because it will be recomputed and added
1236 * on transmission
1237 */
1238 if (skb->len < (iterator.max_length + FCS_LEN))
1239 return TXRX_DROP;
1240
1241 skb_trim(skb, skb->len - FCS_LEN);
1242 }
1243 break;
1244
1245 default:
1246 break;
1247 }
1248 }
1249
1250 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1251 return TXRX_DROP;
1252
1253 /*
1254 * remove the radiotap header
1255 * iterator->max_length was sanity-checked against
1256 * skb->len by iterator init
1257 */
1258 skb_pull(skb, iterator.max_length);
1259
1260 return TXRX_CONTINUE;
1261 }
1262
1263
1264 static ieee80211_txrx_result inline
1265 __ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1266 struct sk_buff *skb,
1267 struct net_device *dev,
1268 struct ieee80211_tx_control *control)
1269 {
1270 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1271 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1272 struct ieee80211_sub_if_data *sdata;
1273 ieee80211_txrx_result res = TXRX_CONTINUE;
1274
1275 int hdrlen;
1276
1277 memset(tx, 0, sizeof(*tx));
1278 tx->skb = skb;
1279 tx->dev = dev; /* use original interface */
1280 tx->local = local;
1281 tx->sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1282 tx->sta = sta_info_get(local, hdr->addr1);
1283 tx->fc = le16_to_cpu(hdr->frame_control);
1284
1285 /*
1286 * set defaults for things that can be set by
1287 * injected radiotap headers
1288 */
1289 control->power_level = local->hw.conf.power_level;
1290 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
1291 if (local->sta_antenna_sel != STA_ANTENNA_SEL_AUTO && tx->sta)
1292 control->antenna_sel_tx = tx->sta->antenna_sel_tx;
1293
1294 /* process and remove the injection radiotap header */
1295 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1296 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
1297 if (__ieee80211_parse_tx_radiotap(tx, skb, control) ==
1298 TXRX_DROP) {
1299 return TXRX_DROP;
1300 }
1301 /*
1302 * we removed the radiotap header after this point,
1303 * we filled control with what we could use
1304 * set to the actual ieee header now
1305 */
1306 hdr = (struct ieee80211_hdr *) skb->data;
1307 res = TXRX_QUEUED; /* indication it was monitor packet */
1308 }
1309
1310 tx->u.tx.control = control;
1311 tx->u.tx.unicast = !is_multicast_ether_addr(hdr->addr1);
1312 if (is_multicast_ether_addr(hdr->addr1))
1313 control->flags |= IEEE80211_TXCTL_NO_ACK;
1314 else
1315 control->flags &= ~IEEE80211_TXCTL_NO_ACK;
1316 tx->fragmented = local->fragmentation_threshold <
1317 IEEE80211_MAX_FRAG_THRESHOLD && tx->u.tx.unicast &&
1318 skb->len + FCS_LEN > local->fragmentation_threshold &&
1319 (!local->ops->set_frag_threshold);
1320 if (!tx->sta)
1321 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1322 else if (tx->sta->clear_dst_mask) {
1323 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
1324 tx->sta->clear_dst_mask = 0;
1325 }
1326 hdrlen = ieee80211_get_hdrlen(tx->fc);
1327 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1328 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1329 tx->ethertype = (pos[0] << 8) | pos[1];
1330 }
1331 control->flags |= IEEE80211_TXCTL_FIRST_FRAGMENT;
1332
1333 return res;
1334 }
1335
1336 static int inline is_ieee80211_device(struct net_device *dev,
1337 struct net_device *master)
1338 {
1339 return (wdev_priv(dev->ieee80211_ptr) ==
1340 wdev_priv(master->ieee80211_ptr));
1341 }
1342
1343 /* Device in tx->dev has a reference added; use dev_put(tx->dev) when
1344 * finished with it. */
1345 static int inline ieee80211_tx_prepare(struct ieee80211_txrx_data *tx,
1346 struct sk_buff *skb,
1347 struct net_device *mdev,
1348 struct ieee80211_tx_control *control)
1349 {
1350 struct ieee80211_tx_packet_data *pkt_data;
1351 struct net_device *dev;
1352
1353 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1354 dev = dev_get_by_index(pkt_data->ifindex);
1355 if (unlikely(dev && !is_ieee80211_device(dev, mdev))) {
1356 dev_put(dev);
1357 dev = NULL;
1358 }
1359 if (unlikely(!dev))
1360 return -ENODEV;
1361 __ieee80211_tx_prepare(tx, skb, dev, control);
1362 return 0;
1363 }
1364
1365 static inline int __ieee80211_queue_stopped(const struct ieee80211_local *local,
1366 int queue)
1367 {
1368 return test_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
1369 }
1370
1371 static inline int __ieee80211_queue_pending(const struct ieee80211_local *local,
1372 int queue)
1373 {
1374 return test_bit(IEEE80211_LINK_STATE_PENDING, &local->state[queue]);
1375 }
1376
1377 #define IEEE80211_TX_OK 0
1378 #define IEEE80211_TX_AGAIN 1
1379 #define IEEE80211_TX_FRAG_AGAIN 2
1380
1381 static int __ieee80211_tx(struct ieee80211_local *local, struct sk_buff *skb,
1382 struct ieee80211_txrx_data *tx)
1383 {
1384 struct ieee80211_tx_control *control = tx->u.tx.control;
1385 int ret, i;
1386
1387 if (!ieee80211_qdisc_installed(local->mdev) &&
1388 __ieee80211_queue_stopped(local, 0)) {
1389 netif_stop_queue(local->mdev);
1390 return IEEE80211_TX_AGAIN;
1391 }
1392 if (skb) {
1393 ieee80211_dump_frame(local->mdev->name, "TX to low-level driver", skb);
1394 ret = local->ops->tx(local_to_hw(local), skb, control);
1395 if (ret)
1396 return IEEE80211_TX_AGAIN;
1397 local->mdev->trans_start = jiffies;
1398 ieee80211_led_tx(local, 1);
1399 }
1400 if (tx->u.tx.extra_frag) {
1401 control->flags &= ~(IEEE80211_TXCTL_USE_RTS_CTS |
1402 IEEE80211_TXCTL_USE_CTS_PROTECT |
1403 IEEE80211_TXCTL_CLEAR_DST_MASK |
1404 IEEE80211_TXCTL_FIRST_FRAGMENT);
1405 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
1406 if (!tx->u.tx.extra_frag[i])
1407 continue;
1408 if (__ieee80211_queue_stopped(local, control->queue))
1409 return IEEE80211_TX_FRAG_AGAIN;
1410 if (i == tx->u.tx.num_extra_frag) {
1411 control->tx_rate = tx->u.tx.last_frag_hwrate;
1412 control->rate = tx->u.tx.last_frag_rate;
1413 if (tx->u.tx.probe_last_frag)
1414 control->flags |=
1415 IEEE80211_TXCTL_RATE_CTRL_PROBE;
1416 else
1417 control->flags &=
1418 ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
1419 }
1420
1421 ieee80211_dump_frame(local->mdev->name,
1422 "TX to low-level driver",
1423 tx->u.tx.extra_frag[i]);
1424 ret = local->ops->tx(local_to_hw(local),
1425 tx->u.tx.extra_frag[i],
1426 control);
1427 if (ret)
1428 return IEEE80211_TX_FRAG_AGAIN;
1429 local->mdev->trans_start = jiffies;
1430 ieee80211_led_tx(local, 1);
1431 tx->u.tx.extra_frag[i] = NULL;
1432 }
1433 kfree(tx->u.tx.extra_frag);
1434 tx->u.tx.extra_frag = NULL;
1435 }
1436 return IEEE80211_TX_OK;
1437 }
1438
1439 static int ieee80211_tx(struct net_device *dev, struct sk_buff *skb,
1440 struct ieee80211_tx_control *control, int mgmt)
1441 {
1442 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1443 struct sta_info *sta;
1444 ieee80211_tx_handler *handler;
1445 struct ieee80211_txrx_data tx;
1446 ieee80211_txrx_result res = TXRX_DROP, res_prepare;
1447 int ret, i;
1448
1449 WARN_ON(__ieee80211_queue_pending(local, control->queue));
1450
1451 if (unlikely(skb->len < 10)) {
1452 dev_kfree_skb(skb);
1453 return 0;
1454 }
1455
1456 res_prepare = __ieee80211_tx_prepare(&tx, skb, dev, control);
1457
1458 if (res_prepare == TXRX_DROP) {
1459 dev_kfree_skb(skb);
1460 return 0;
1461 }
1462
1463 sta = tx.sta;
1464 tx.u.tx.mgmt_interface = mgmt;
1465 tx.u.tx.mode = local->hw.conf.mode;
1466
1467 if (res_prepare == TXRX_QUEUED) { /* if it was an injected packet */
1468 res = TXRX_CONTINUE;
1469 } else {
1470 for (handler = local->tx_handlers; *handler != NULL;
1471 handler++) {
1472 res = (*handler)(&tx);
1473 if (res != TXRX_CONTINUE)
1474 break;
1475 }
1476 }
1477
1478 skb = tx.skb; /* handlers are allowed to change skb */
1479
1480 if (sta)
1481 sta_info_put(sta);
1482
1483 if (unlikely(res == TXRX_DROP)) {
1484 I802_DEBUG_INC(local->tx_handlers_drop);
1485 goto drop;
1486 }
1487
1488 if (unlikely(res == TXRX_QUEUED)) {
1489 I802_DEBUG_INC(local->tx_handlers_queued);
1490 return 0;
1491 }
1492
1493 if (tx.u.tx.extra_frag) {
1494 for (i = 0; i < tx.u.tx.num_extra_frag; i++) {
1495 int next_len, dur;
1496 struct ieee80211_hdr *hdr =
1497 (struct ieee80211_hdr *)
1498 tx.u.tx.extra_frag[i]->data;
1499
1500 if (i + 1 < tx.u.tx.num_extra_frag) {
1501 next_len = tx.u.tx.extra_frag[i + 1]->len;
1502 } else {
1503 next_len = 0;
1504 tx.u.tx.rate = tx.u.tx.last_frag_rate;
1505 tx.u.tx.last_frag_hwrate = tx.u.tx.rate->val;
1506 }
1507 dur = ieee80211_duration(&tx, 0, next_len);
1508 hdr->duration_id = cpu_to_le16(dur);
1509 }
1510 }
1511
1512 retry:
1513 ret = __ieee80211_tx(local, skb, &tx);
1514 if (ret) {
1515 struct ieee80211_tx_stored_packet *store =
1516 &local->pending_packet[control->queue];
1517
1518 if (ret == IEEE80211_TX_FRAG_AGAIN)
1519 skb = NULL;
1520 set_bit(IEEE80211_LINK_STATE_PENDING,
1521 &local->state[control->queue]);
1522 smp_mb();
1523 /* When the driver gets out of buffers during sending of
1524 * fragments and calls ieee80211_stop_queue, there is
1525 * a small window between IEEE80211_LINK_STATE_XOFF and
1526 * IEEE80211_LINK_STATE_PENDING flags are set. If a buffer
1527 * gets available in that window (i.e. driver calls
1528 * ieee80211_wake_queue), we would end up with ieee80211_tx
1529 * called with IEEE80211_LINK_STATE_PENDING. Prevent this by
1530 * continuing transmitting here when that situation is
1531 * possible to have happened. */
1532 if (!__ieee80211_queue_stopped(local, control->queue)) {
1533 clear_bit(IEEE80211_LINK_STATE_PENDING,
1534 &local->state[control->queue]);
1535 goto retry;
1536 }
1537 memcpy(&store->control, control,
1538 sizeof(struct ieee80211_tx_control));
1539 store->skb = skb;
1540 store->extra_frag = tx.u.tx.extra_frag;
1541 store->num_extra_frag = tx.u.tx.num_extra_frag;
1542 store->last_frag_hwrate = tx.u.tx.last_frag_hwrate;
1543 store->last_frag_rate = tx.u.tx.last_frag_rate;
1544 store->last_frag_rate_ctrl_probe = tx.u.tx.probe_last_frag;
1545 }
1546 return 0;
1547
1548 drop:
1549 if (skb)
1550 dev_kfree_skb(skb);
1551 for (i = 0; i < tx.u.tx.num_extra_frag; i++)
1552 if (tx.u.tx.extra_frag[i])
1553 dev_kfree_skb(tx.u.tx.extra_frag[i]);
1554 kfree(tx.u.tx.extra_frag);
1555 return 0;
1556 }
1557
1558 static void ieee80211_tx_pending(unsigned long data)
1559 {
1560 struct ieee80211_local *local = (struct ieee80211_local *)data;
1561 struct net_device *dev = local->mdev;
1562 struct ieee80211_tx_stored_packet *store;
1563 struct ieee80211_txrx_data tx;
1564 int i, ret, reschedule = 0;
1565
1566 netif_tx_lock_bh(dev);
1567 for (i = 0; i < local->hw.queues; i++) {
1568 if (__ieee80211_queue_stopped(local, i))
1569 continue;
1570 if (!__ieee80211_queue_pending(local, i)) {
1571 reschedule = 1;
1572 continue;
1573 }
1574 store = &local->pending_packet[i];
1575 tx.u.tx.control = &store->control;
1576 tx.u.tx.extra_frag = store->extra_frag;
1577 tx.u.tx.num_extra_frag = store->num_extra_frag;
1578 tx.u.tx.last_frag_hwrate = store->last_frag_hwrate;
1579 tx.u.tx.last_frag_rate = store->last_frag_rate;
1580 tx.u.tx.probe_last_frag = store->last_frag_rate_ctrl_probe;
1581 ret = __ieee80211_tx(local, store->skb, &tx);
1582 if (ret) {
1583 if (ret == IEEE80211_TX_FRAG_AGAIN)
1584 store->skb = NULL;
1585 } else {
1586 clear_bit(IEEE80211_LINK_STATE_PENDING,
1587 &local->state[i]);
1588 reschedule = 1;
1589 }
1590 }
1591 netif_tx_unlock_bh(dev);
1592 if (reschedule) {
1593 if (!ieee80211_qdisc_installed(dev)) {
1594 if (!__ieee80211_queue_stopped(local, 0))
1595 netif_wake_queue(dev);
1596 } else
1597 netif_schedule(dev);
1598 }
1599 }
1600
1601 static void ieee80211_clear_tx_pending(struct ieee80211_local *local)
1602 {
1603 int i, j;
1604 struct ieee80211_tx_stored_packet *store;
1605
1606 for (i = 0; i < local->hw.queues; i++) {
1607 if (!__ieee80211_queue_pending(local, i))
1608 continue;
1609 store = &local->pending_packet[i];
1610 kfree_skb(store->skb);
1611 for (j = 0; j < store->num_extra_frag; j++)
1612 kfree_skb(store->extra_frag[j]);
1613 kfree(store->extra_frag);
1614 clear_bit(IEEE80211_LINK_STATE_PENDING, &local->state[i]);
1615 }
1616 }
1617
1618 static int ieee80211_master_start_xmit(struct sk_buff *skb,
1619 struct net_device *dev)
1620 {
1621 struct ieee80211_tx_control control;
1622 struct ieee80211_tx_packet_data *pkt_data;
1623 struct net_device *odev = NULL;
1624 struct ieee80211_sub_if_data *osdata;
1625 int headroom;
1626 int ret;
1627
1628 /*
1629 * copy control out of the skb so other people can use skb->cb
1630 */
1631 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1632 memset(&control, 0, sizeof(struct ieee80211_tx_control));
1633
1634 if (pkt_data->ifindex)
1635 odev = dev_get_by_index(pkt_data->ifindex);
1636 if (unlikely(odev && !is_ieee80211_device(odev, dev))) {
1637 dev_put(odev);
1638 odev = NULL;
1639 }
1640 if (unlikely(!odev)) {
1641 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1642 printk(KERN_DEBUG "%s: Discarded packet with nonexistent "
1643 "originating device\n", dev->name);
1644 #endif
1645 dev_kfree_skb(skb);
1646 return 0;
1647 }
1648 osdata = IEEE80211_DEV_TO_SUB_IF(odev);
1649
1650 headroom = osdata->local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM;
1651 if (skb_headroom(skb) < headroom) {
1652 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
1653 dev_kfree_skb(skb);
1654 return 0;
1655 }
1656 }
1657
1658 control.ifindex = odev->ifindex;
1659 control.type = osdata->type;
1660 if (pkt_data->req_tx_status)
1661 control.flags |= IEEE80211_TXCTL_REQ_TX_STATUS;
1662 if (pkt_data->do_not_encrypt)
1663 control.flags |= IEEE80211_TXCTL_DO_NOT_ENCRYPT;
1664 if (pkt_data->requeue)
1665 control.flags |= IEEE80211_TXCTL_REQUEUE;
1666 control.queue = pkt_data->queue;
1667
1668 ret = ieee80211_tx(odev, skb, &control,
1669 control.type == IEEE80211_IF_TYPE_MGMT);
1670 dev_put(odev);
1671
1672 return ret;
1673 }
1674
1675
1676 /**
1677 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1678 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1679 * @skb: packet to be sent
1680 * @dev: incoming interface
1681 *
1682 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1683 * not be freed, and caller is responsible for either retrying later or freeing
1684 * skb).
1685 *
1686 * This function takes in an Ethernet header and encapsulates it with suitable
1687 * IEEE 802.11 header based on which interface the packet is coming in. The
1688 * encapsulated packet will then be passed to master interface, wlan#.11, for
1689 * transmission (through low-level driver).
1690 */
1691 static int ieee80211_subif_start_xmit(struct sk_buff *skb,
1692 struct net_device *dev)
1693 {
1694 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1695 struct ieee80211_tx_packet_data *pkt_data;
1696 struct ieee80211_sub_if_data *sdata;
1697 int ret = 1, head_need;
1698 u16 ethertype, hdrlen, fc;
1699 struct ieee80211_hdr hdr;
1700 const u8 *encaps_data;
1701 int encaps_len, skip_header_bytes;
1702 int nh_pos, h_pos, no_encrypt = 0;
1703 struct sta_info *sta;
1704
1705 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1706 if (unlikely(skb->len < ETH_HLEN)) {
1707 printk(KERN_DEBUG "%s: short skb (len=%d)\n",
1708 dev->name, skb->len);
1709 ret = 0;
1710 goto fail;
1711 }
1712
1713 if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
1714 struct ieee80211_radiotap_header *prthdr =
1715 (struct ieee80211_radiotap_header *)skb->data;
1716 u16 len;
1717
1718 /*
1719 * there must be a radiotap header at the
1720 * start in this case
1721 */
1722 if (unlikely(prthdr->it_version)) {
1723 /* only version 0 is supported */
1724 ret = 0;
1725 goto fail;
1726 }
1727
1728 skb->dev = local->mdev;
1729
1730 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1731 memset(pkt_data, 0, sizeof(*pkt_data));
1732 pkt_data->ifindex = sdata->dev->ifindex;
1733 pkt_data->mgmt_iface = 0;
1734 pkt_data->do_not_encrypt = 1;
1735
1736 /* above needed because we set skb device to master */
1737
1738 /*
1739 * fix up the pointers accounting for the radiotap
1740 * header still being in there. We are being given
1741 * a precooked IEEE80211 header so no need for
1742 * normal processing
1743 */
1744 len = le16_to_cpu(get_unaligned(&prthdr->it_len));
1745 skb_set_mac_header(skb, len);
1746 skb_set_network_header(skb, len + sizeof(hdr));
1747 skb_set_transport_header(skb, len + sizeof(hdr));
1748
1749 /*
1750 * pass the radiotap header up to
1751 * the next stage intact
1752 */
1753 dev_queue_xmit(skb);
1754
1755 return 0;
1756 }
1757
1758 nh_pos = skb_network_header(skb) - skb->data;
1759 h_pos = skb_transport_header(skb) - skb->data;
1760
1761 /* convert Ethernet header to proper 802.11 header (based on
1762 * operation mode) */
1763 ethertype = (skb->data[12] << 8) | skb->data[13];
1764 /* TODO: handling for 802.1x authorized/unauthorized port */
1765 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
1766
1767 if (likely(sdata->type == IEEE80211_IF_TYPE_AP ||
1768 sdata->type == IEEE80211_IF_TYPE_VLAN)) {
1769 fc |= IEEE80211_FCTL_FROMDS;
1770 /* DA BSSID SA */
1771 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1772 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1773 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1774 hdrlen = 24;
1775 } else if (sdata->type == IEEE80211_IF_TYPE_WDS) {
1776 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
1777 /* RA TA DA SA */
1778 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1779 memcpy(hdr.addr2, dev->dev_addr, ETH_ALEN);
1780 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1781 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1782 hdrlen = 30;
1783 } else if (sdata->type == IEEE80211_IF_TYPE_STA) {
1784 fc |= IEEE80211_FCTL_TODS;
1785 /* BSSID SA DA */
1786 memcpy(hdr.addr1, sdata->u.sta.bssid, ETH_ALEN);
1787 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1788 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1789 hdrlen = 24;
1790 } else if (sdata->type == IEEE80211_IF_TYPE_IBSS) {
1791 /* DA SA BSSID */
1792 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1793 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1794 memcpy(hdr.addr3, sdata->u.sta.bssid, ETH_ALEN);
1795 hdrlen = 24;
1796 } else {
1797 ret = 0;
1798 goto fail;
1799 }
1800
1801 /* receiver is QoS enabled, use a QoS type frame */
1802 sta = sta_info_get(local, hdr.addr1);
1803 if (sta) {
1804 if (sta->flags & WLAN_STA_WME) {
1805 fc |= IEEE80211_STYPE_QOS_DATA;
1806 hdrlen += 2;
1807 }
1808 sta_info_put(sta);
1809 }
1810
1811 hdr.frame_control = cpu_to_le16(fc);
1812 hdr.duration_id = 0;
1813 hdr.seq_ctrl = 0;
1814
1815 skip_header_bytes = ETH_HLEN;
1816 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1817 encaps_data = bridge_tunnel_header;
1818 encaps_len = sizeof(bridge_tunnel_header);
1819 skip_header_bytes -= 2;
1820 } else if (ethertype >= 0x600) {
1821 encaps_data = rfc1042_header;
1822 encaps_len = sizeof(rfc1042_header);
1823 skip_header_bytes -= 2;
1824 } else {
1825 encaps_data = NULL;
1826 encaps_len = 0;
1827 }
1828
1829 skb_pull(skb, skip_header_bytes);
1830 nh_pos -= skip_header_bytes;
1831 h_pos -= skip_header_bytes;
1832
1833 /* TODO: implement support for fragments so that there is no need to
1834 * reallocate and copy payload; it might be enough to support one
1835 * extra fragment that would be copied in the beginning of the frame
1836 * data.. anyway, it would be nice to include this into skb structure
1837 * somehow
1838 *
1839 * There are few options for this:
1840 * use skb->cb as an extra space for 802.11 header
1841 * allocate new buffer if not enough headroom
1842 * make sure that there is enough headroom in every skb by increasing
1843 * build in headroom in __dev_alloc_skb() (linux/skbuff.h) and
1844 * alloc_skb() (net/core/skbuff.c)
1845 */
1846 head_need = hdrlen + encaps_len + local->tx_headroom;
1847 head_need -= skb_headroom(skb);
1848
1849 /* We are going to modify skb data, so make a copy of it if happens to
1850 * be cloned. This could happen, e.g., with Linux bridge code passing
1851 * us broadcast frames. */
1852
1853 if (head_need > 0 || skb_cloned(skb)) {
1854 #if 0
1855 printk(KERN_DEBUG "%s: need to reallocate buffer for %d bytes "
1856 "of headroom\n", dev->name, head_need);
1857 #endif
1858
1859 if (skb_cloned(skb))
1860 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1861 else
1862 I802_DEBUG_INC(local->tx_expand_skb_head);
1863 /* Since we have to reallocate the buffer, make sure that there
1864 * is enough room for possible WEP IV/ICV and TKIP (8 bytes
1865 * before payload and 12 after). */
1866 if (pskb_expand_head(skb, (head_need > 0 ? head_need + 8 : 8),
1867 12, GFP_ATOMIC)) {
1868 printk(KERN_DEBUG "%s: failed to reallocate TX buffer"
1869 "\n", dev->name);
1870 goto fail;
1871 }
1872 }
1873
1874 if (encaps_data) {
1875 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1876 nh_pos += encaps_len;
1877 h_pos += encaps_len;
1878 }
1879 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1880 nh_pos += hdrlen;
1881 h_pos += hdrlen;
1882
1883 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1884 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1885 pkt_data->ifindex = sdata->dev->ifindex;
1886 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1887 pkt_data->do_not_encrypt = no_encrypt;
1888
1889 skb->dev = local->mdev;
1890 sdata->stats.tx_packets++;
1891 sdata->stats.tx_bytes += skb->len;
1892
1893 /* Update skb pointers to various headers since this modified frame
1894 * is going to go through Linux networking code that may potentially
1895 * need things like pointer to IP header. */
1896 skb_set_mac_header(skb, 0);
1897 skb_set_network_header(skb, nh_pos);
1898 skb_set_transport_header(skb, h_pos);
1899
1900 dev->trans_start = jiffies;
1901 dev_queue_xmit(skb);
1902
1903 return 0;
1904
1905 fail:
1906 if (!ret)
1907 dev_kfree_skb(skb);
1908
1909 return ret;
1910 }
1911
1912
1913 /*
1914 * This is the transmit routine for the 802.11 type interfaces
1915 * called by upper layers of the linux networking
1916 * stack when it has a frame to transmit
1917 */
1918 static int
1919 ieee80211_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
1920 {
1921 struct ieee80211_sub_if_data *sdata;
1922 struct ieee80211_tx_packet_data *pkt_data;
1923 struct ieee80211_hdr *hdr;
1924 u16 fc;
1925
1926 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1927
1928 if (skb->len < 10) {
1929 dev_kfree_skb(skb);
1930 return 0;
1931 }
1932
1933 if (skb_headroom(skb) < sdata->local->tx_headroom) {
1934 if (pskb_expand_head(skb, sdata->local->tx_headroom,
1935 0, GFP_ATOMIC)) {
1936 dev_kfree_skb(skb);
1937 return 0;
1938 }
1939 }
1940
1941 hdr = (struct ieee80211_hdr *) skb->data;
1942 fc = le16_to_cpu(hdr->frame_control);
1943
1944 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
1945 memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
1946 pkt_data->ifindex = sdata->dev->ifindex;
1947 pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
1948
1949 skb->priority = 20; /* use hardcoded priority for mgmt TX queue */
1950 skb->dev = sdata->local->mdev;
1951
1952 /*
1953 * We're using the protocol field of the the frame control header
1954 * to request TX callback for hostapd. BIT(1) is checked.
1955 */
1956 if ((fc & BIT(1)) == BIT(1)) {
1957 pkt_data->req_tx_status = 1;
1958 fc &= ~BIT(1);
1959 hdr->frame_control = cpu_to_le16(fc);
1960 }
1961
1962 pkt_data->do_not_encrypt = !(fc & IEEE80211_FCTL_PROTECTED);
1963
1964 sdata->stats.tx_packets++;
1965 sdata->stats.tx_bytes += skb->len;
1966
1967 dev_queue_xmit(skb);
1968
1969 return 0;
1970 }
1971
1972
1973 static void ieee80211_beacon_add_tim(struct ieee80211_local *local,
1974 struct ieee80211_if_ap *bss,
1975 struct sk_buff *skb)
1976 {
1977 u8 *pos, *tim;
1978 int aid0 = 0;
1979 int i, have_bits = 0, n1, n2;
1980
1981 /* Generate bitmap for TIM only if there are any STAs in power save
1982 * mode. */
1983 spin_lock_bh(&local->sta_lock);
1984 if (atomic_read(&bss->num_sta_ps) > 0)
1985 /* in the hope that this is faster than
1986 * checking byte-for-byte */
1987 have_bits = !bitmap_empty((unsigned long*)bss->tim,
1988 IEEE80211_MAX_AID+1);
1989
1990 if (bss->dtim_count == 0)
1991 bss->dtim_count = bss->dtim_period - 1;
1992 else
1993 bss->dtim_count--;
1994
1995 tim = pos = (u8 *) skb_put(skb, 6);
1996 *pos++ = WLAN_EID_TIM;
1997 *pos++ = 4;
1998 *pos++ = bss->dtim_count;
1999 *pos++ = bss->dtim_period;
2000
2001 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2002 aid0 = 1;
2003
2004 if (have_bits) {
2005 /* Find largest even number N1 so that bits numbered 1 through
2006 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2007 * (N2 + 1) x 8 through 2007 are 0. */
2008 n1 = 0;
2009 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2010 if (bss->tim[i]) {
2011 n1 = i & 0xfe;
2012 break;
2013 }
2014 }
2015 n2 = n1;
2016 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2017 if (bss->tim[i]) {
2018 n2 = i;
2019 break;
2020 }
2021 }
2022
2023 /* Bitmap control */
2024 *pos++ = n1 | aid0;
2025 /* Part Virt Bitmap */
2026 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2027
2028 tim[1] = n2 - n1 + 4;
2029 skb_put(skb, n2 - n1);
2030 } else {
2031 *pos++ = aid0; /* Bitmap control */
2032 *pos++ = 0; /* Part Virt Bitmap */
2033 }
2034 spin_unlock_bh(&local->sta_lock);
2035 }
2036
2037
2038 struct sk_buff * ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
2039 struct ieee80211_tx_control *control)
2040 {
2041 struct ieee80211_local *local = hw_to_local(hw);
2042 struct sk_buff *skb;
2043 struct net_device *bdev;
2044 struct ieee80211_sub_if_data *sdata = NULL;
2045 struct ieee80211_if_ap *ap = NULL;
2046 struct ieee80211_rate *rate;
2047 struct rate_control_extra extra;
2048 u8 *b_head, *b_tail;
2049 int bh_len, bt_len;
2050
2051 bdev = dev_get_by_index(if_id);
2052 if (bdev) {
2053 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
2054 ap = &sdata->u.ap;
2055 dev_put(bdev);
2056 }
2057
2058 if (!ap || sdata->type != IEEE80211_IF_TYPE_AP ||
2059 !ap->beacon_head) {
2060 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2061 if (net_ratelimit())
2062 printk(KERN_DEBUG "no beacon data avail for idx=%d "
2063 "(%s)\n", if_id, bdev ? bdev->name : "N/A");
2064 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2065 return NULL;
2066 }
2067
2068 /* Assume we are generating the normal beacon locally */
2069 b_head = ap->beacon_head;
2070 b_tail = ap->beacon_tail;
2071 bh_len = ap->beacon_head_len;
2072 bt_len = ap->beacon_tail_len;
2073
2074 skb = dev_alloc_skb(local->tx_headroom +
2075 bh_len + bt_len + 256 /* maximum TIM len */);
2076 if (!skb)
2077 return NULL;
2078
2079 skb_reserve(skb, local->tx_headroom);
2080 memcpy(skb_put(skb, bh_len), b_head, bh_len);
2081
2082 ieee80211_include_sequence(sdata, (struct ieee80211_hdr *)skb->data);
2083
2084 ieee80211_beacon_add_tim(local, ap, skb);
2085
2086 if (b_tail) {
2087 memcpy(skb_put(skb, bt_len), b_tail, bt_len);
2088 }
2089
2090 if (control) {
2091 memset(&extra, 0, sizeof(extra));
2092 extra.mode = local->oper_hw_mode;
2093
2094 rate = rate_control_get_rate(local, local->mdev, skb, &extra);
2095 if (!rate) {
2096 if (net_ratelimit()) {
2097 printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
2098 "found\n", local->mdev->name);
2099 }
2100 dev_kfree_skb(skb);
2101 return NULL;
2102 }
2103
2104 control->tx_rate = (local->short_preamble &&
2105 (rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
2106 rate->val2 : rate->val;
2107 control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
2108 control->power_level = local->hw.conf.power_level;
2109 control->flags |= IEEE80211_TXCTL_NO_ACK;
2110 control->retry_limit = 1;
2111 control->flags |= IEEE80211_TXCTL_CLEAR_DST_MASK;
2112 }
2113
2114 ap->num_beacons++;
2115 return skb;
2116 }
2117 EXPORT_SYMBOL(ieee80211_beacon_get);
2118
2119 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
2120 size_t frame_len,
2121 const struct ieee80211_tx_control *frame_txctl)
2122 {
2123 struct ieee80211_local *local = hw_to_local(hw);
2124 struct ieee80211_rate *rate;
2125 int short_preamble = local->short_preamble;
2126 int erp;
2127 u16 dur;
2128
2129 rate = frame_txctl->rts_rate;
2130 erp = !!(rate->flags & IEEE80211_RATE_ERP);
2131
2132 /* CTS duration */
2133 dur = ieee80211_frame_duration(local, 10, rate->rate,
2134 erp, short_preamble);
2135 /* Data frame duration */
2136 dur += ieee80211_frame_duration(local, frame_len, rate->rate,
2137 erp, short_preamble);
2138 /* ACK duration */
2139 dur += ieee80211_frame_duration(local, 10, rate->rate,
2140 erp, short_preamble);
2141
2142 return cpu_to_le16(dur);
2143 }
2144 EXPORT_SYMBOL(ieee80211_rts_duration);
2145
2146
2147 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
2148 size_t frame_len,
2149 const struct ieee80211_tx_control *frame_txctl)
2150 {
2151 struct ieee80211_local *local = hw_to_local(hw);
2152 struct ieee80211_rate *rate;
2153 int short_preamble = local->short_preamble;
2154 int erp;
2155 u16 dur;
2156
2157 rate = frame_txctl->rts_rate;
2158 erp = !!(rate->flags & IEEE80211_RATE_ERP);
2159
2160 /* Data frame duration */
2161 dur = ieee80211_frame_duration(local, frame_len, rate->rate,
2162 erp, short_preamble);
2163 if (!(frame_txctl->flags & IEEE80211_TXCTL_NO_ACK)) {
2164 /* ACK duration */
2165 dur += ieee80211_frame_duration(local, 10, rate->rate,
2166 erp, short_preamble);
2167 }
2168
2169 return cpu_to_le16(dur);
2170 }
2171 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
2172
2173 void ieee80211_rts_get(struct ieee80211_hw *hw,
2174 const void *frame, size_t frame_len,
2175 const struct ieee80211_tx_control *frame_txctl,
2176 struct ieee80211_rts *rts)
2177 {
2178 const struct ieee80211_hdr *hdr = frame;
2179 u16 fctl;
2180
2181 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS;
2182 rts->frame_control = cpu_to_le16(fctl);
2183 rts->duration = ieee80211_rts_duration(hw, frame_len, frame_txctl);
2184 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2185 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2186 }
2187 EXPORT_SYMBOL(ieee80211_rts_get);
2188
2189 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
2190 const void *frame, size_t frame_len,
2191 const struct ieee80211_tx_control *frame_txctl,
2192 struct ieee80211_cts *cts)
2193 {
2194 const struct ieee80211_hdr *hdr = frame;
2195 u16 fctl;
2196
2197 fctl = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS;
2198 cts->frame_control = cpu_to_le16(fctl);
2199 cts->duration = ieee80211_ctstoself_duration(hw, frame_len, frame_txctl);
2200 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2201 }
2202 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2203
2204 struct sk_buff *
2205 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
2206 struct ieee80211_tx_control *control)
2207 {
2208 struct ieee80211_local *local = hw_to_local(hw);
2209 struct sk_buff *skb;
2210 struct sta_info *sta;
2211 ieee80211_tx_handler *handler;
2212 struct ieee80211_txrx_data tx;
2213 ieee80211_txrx_result res = TXRX_DROP;
2214 struct net_device *bdev;
2215 struct ieee80211_sub_if_data *sdata;
2216 struct ieee80211_if_ap *bss = NULL;
2217
2218 bdev = dev_get_by_index(if_id);
2219 if (bdev) {
2220 sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
2221 bss = &sdata->u.ap;
2222 dev_put(bdev);
2223 }
2224 if (!bss || sdata->type != IEEE80211_IF_TYPE_AP || !bss->beacon_head)
2225 return NULL;
2226
2227 if (bss->dtim_count != 0)
2228 return NULL; /* send buffered bc/mc only after DTIM beacon */
2229 memset(control, 0, sizeof(*control));
2230 while (1) {
2231 skb = skb_dequeue(&bss->ps_bc_buf);
2232 if (!skb)
2233 return NULL;
2234 local->total_ps_buffered--;
2235
2236 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2237 struct ieee80211_hdr *hdr =
2238 (struct ieee80211_hdr *) skb->data;
2239 /* more buffered multicast/broadcast frames ==> set
2240 * MoreData flag in IEEE 802.11 header to inform PS
2241 * STAs */
2242 hdr->frame_control |=
2243 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2244 }
2245
2246 if (ieee80211_tx_prepare(&tx, skb, local->mdev, control) == 0)
2247 break;
2248 dev_kfree_skb_any(skb);
2249 }
2250 sta = tx.sta;
2251 tx.u.tx.ps_buffered = 1;
2252
2253 for (handler = local->tx_handlers; *handler != NULL; handler++) {
2254 res = (*handler)(&tx);
2255 if (res == TXRX_DROP || res == TXRX_QUEUED)
2256 break;
2257 }
2258 dev_put(tx.dev);
2259 skb = tx.skb; /* handlers are allowed to change skb */
2260
2261 if (res == TXRX_DROP) {
2262 I802_DEBUG_INC(local->tx_handlers_drop);
2263 dev_kfree_skb(skb);
2264 skb = NULL;
2265 } else if (res == TXRX_QUEUED) {
2266 I802_DEBUG_INC(local->tx_handlers_queued);
2267 skb = NULL;
2268 }
2269
2270 if (sta)
2271 sta_info_put(sta);
2272
2273 return skb;
2274 }
2275 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2276
2277 static int __ieee80211_if_config(struct net_device *dev,
2278 struct sk_buff *beacon,
2279 struct ieee80211_tx_control *control)
2280 {
2281 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2282 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2283 struct ieee80211_if_conf conf;
2284 static u8 scan_bssid[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
2285
2286 if (!local->ops->config_interface || !netif_running(dev))
2287 return 0;
2288
2289 memset(&conf, 0, sizeof(conf));
2290 conf.type = sdata->type;
2291 if (sdata->type == IEEE80211_IF_TYPE_STA ||
2292 sdata->type == IEEE80211_IF_TYPE_IBSS) {
2293 if (local->sta_scanning &&
2294 local->scan_dev == dev)
2295 conf.bssid = scan_bssid;
2296 else
2297 conf.bssid = sdata->u.sta.bssid;
2298 conf.ssid = sdata->u.sta.ssid;
2299 conf.ssid_len = sdata->u.sta.ssid_len;
2300 conf.generic_elem = sdata->u.sta.extra_ie;
2301 conf.generic_elem_len = sdata->u.sta.extra_ie_len;
2302 } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
2303 conf.ssid = sdata->u.ap.ssid;
2304 conf.ssid_len = sdata->u.ap.ssid_len;
2305 conf.generic_elem = sdata->u.ap.generic_elem;
2306 conf.generic_elem_len = sdata->u.ap.generic_elem_len;
2307 conf.beacon = beacon;
2308 conf.beacon_control = control;
2309 }
2310 return local->ops->config_interface(local_to_hw(local),
2311 dev->ifindex, &conf);
2312 }
2313
2314 int ieee80211_if_config(struct net_device *dev)
2315 {
2316 return __ieee80211_if_config(dev, NULL, NULL);
2317 }
2318
2319 int ieee80211_if_config_beacon(struct net_device *dev)
2320 {
2321 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2322 struct ieee80211_tx_control control;
2323 struct sk_buff *skb;
2324
2325 if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
2326 return 0;
2327 skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
2328 if (!skb)
2329 return -ENOMEM;
2330 return __ieee80211_if_config(dev, skb, &control);
2331 }
2332
2333 int ieee80211_hw_config(struct ieee80211_local *local)
2334 {
2335 struct ieee80211_hw_mode *mode;
2336 struct ieee80211_channel *chan;
2337 int ret = 0;
2338
2339 if (local->sta_scanning) {
2340 chan = local->scan_channel;
2341 mode = local->scan_hw_mode;
2342 } else {
2343 chan = local->oper_channel;
2344 mode = local->oper_hw_mode;
2345 }
2346
2347 local->hw.conf.channel = chan->chan;
2348 local->hw.conf.channel_val = chan->val;
2349 local->hw.conf.power_level = chan->power_level;
2350 local->hw.conf.freq = chan->freq;
2351 local->hw.conf.phymode = mode->mode;
2352 local->hw.conf.antenna_max = chan->antenna_max;
2353 local->hw.conf.chan = chan;
2354 local->hw.conf.mode = mode;
2355
2356 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2357 printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
2358 "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
2359 local->hw.conf.phymode);
2360 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2361
2362 if (local->ops->config)
2363 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
2364
2365 return ret;
2366 }
2367
2368
2369 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
2370 {
2371 /* FIX: what would be proper limits for MTU?
2372 * This interface uses 802.3 frames. */
2373 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
2374 printk(KERN_WARNING "%s: invalid MTU %d\n",
2375 dev->name, new_mtu);
2376 return -EINVAL;
2377 }
2378
2379 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2380 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2381 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2382 dev->mtu = new_mtu;
2383 return 0;
2384 }
2385
2386
2387 static int ieee80211_change_mtu_apdev(struct net_device *dev, int new_mtu)
2388 {
2389 /* FIX: what would be proper limits for MTU?
2390 * This interface uses 802.11 frames. */
2391 if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN) {
2392 printk(KERN_WARNING "%s: invalid MTU %d\n",
2393 dev->name, new_mtu);
2394 return -EINVAL;
2395 }
2396
2397 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2398 printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
2399 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
2400 dev->mtu = new_mtu;
2401 return 0;
2402 }
2403
2404 enum netif_tx_lock_class {
2405 TX_LOCK_NORMAL,
2406 TX_LOCK_MASTER,
2407 };
2408
2409 static inline void netif_tx_lock_nested(struct net_device *dev, int subclass)
2410 {
2411 spin_lock_nested(&dev->_xmit_lock, subclass);
2412 dev->xmit_lock_owner = smp_processor_id();
2413 }
2414
2415 static void ieee80211_set_multicast_list(struct net_device *dev)
2416 {
2417 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2418 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2419 unsigned short flags;
2420
2421 netif_tx_lock_nested(local->mdev, TX_LOCK_MASTER);
2422 if (((dev->flags & IFF_ALLMULTI) != 0) ^ (sdata->allmulti != 0)) {
2423 if (sdata->allmulti) {
2424 sdata->allmulti = 0;
2425 local->iff_allmultis--;
2426 } else {
2427 sdata->allmulti = 1;
2428 local->iff_allmultis++;
2429 }
2430 }
2431 if (((dev->flags & IFF_PROMISC) != 0) ^ (sdata->promisc != 0)) {
2432 if (sdata->promisc) {
2433 sdata->promisc = 0;
2434 local->iff_promiscs--;
2435 } else {
2436 sdata->promisc = 1;
2437 local->iff_promiscs++;
2438 }
2439 }
2440 if (dev->mc_count != sdata->mc_count) {
2441 local->mc_count = local->mc_count - sdata->mc_count +
2442 dev->mc_count;
2443 sdata->mc_count = dev->mc_count;
2444 }
2445 if (local->ops->set_multicast_list) {
2446 flags = local->mdev->flags;
2447 if (local->iff_allmultis)
2448 flags |= IFF_ALLMULTI;
2449 if (local->iff_promiscs)
2450 flags |= IFF_PROMISC;
2451 read_lock(&local->sub_if_lock);
2452 local->ops->set_multicast_list(local_to_hw(local), flags,
2453 local->mc_count);
2454 read_unlock(&local->sub_if_lock);
2455 }
2456 netif_tx_unlock(local->mdev);
2457 }
2458
2459 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
2460 struct dev_mc_list *prev,
2461 void **ptr)
2462 {
2463 struct ieee80211_local *local = hw_to_local(hw);
2464 struct ieee80211_sub_if_data *sdata = *ptr;
2465 struct dev_mc_list *mc;
2466
2467 if (!prev) {
2468 WARN_ON(sdata);
2469 sdata = NULL;
2470 }
2471 if (!prev || !prev->next) {
2472 if (sdata)
2473 sdata = list_entry(sdata->list.next,
2474 struct ieee80211_sub_if_data, list);
2475 else
2476 sdata = list_entry(local->sub_if_list.next,
2477 struct ieee80211_sub_if_data, list);
2478 if (&sdata->list != &local->sub_if_list)
2479 mc = sdata->dev->mc_list;
2480 else
2481 mc = NULL;
2482 } else
2483 mc = prev->next;
2484
2485 *ptr = sdata;
2486 return mc;
2487 }
2488 EXPORT_SYMBOL(ieee80211_get_mc_list_item);
2489
2490 static struct net_device_stats *ieee80211_get_stats(struct net_device *dev)
2491 {
2492 struct ieee80211_sub_if_data *sdata;
2493 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2494 return &(sdata->stats);
2495 }
2496
2497 static void ieee80211_if_shutdown(struct net_device *dev)
2498 {
2499 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2500 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2501
2502 ASSERT_RTNL();
2503 switch (sdata->type) {
2504 case IEEE80211_IF_TYPE_STA:
2505 case IEEE80211_IF_TYPE_IBSS:
2506 sdata->u.sta.state = IEEE80211_DISABLED;
2507 del_timer_sync(&sdata->u.sta.timer);
2508 skb_queue_purge(&sdata->u.sta.skb_queue);
2509 if (!local->ops->hw_scan &&
2510 local->scan_dev == sdata->dev) {
2511 local->sta_scanning = 0;
2512 cancel_delayed_work(&local->scan_work);
2513 }
2514 flush_workqueue(local->hw.workqueue);
2515 break;
2516 }
2517 }
2518
2519 static inline int identical_mac_addr_allowed(int type1, int type2)
2520 {
2521 return (type1 == IEEE80211_IF_TYPE_MNTR ||
2522 type2 == IEEE80211_IF_TYPE_MNTR ||
2523 (type1 == IEEE80211_IF_TYPE_AP &&
2524 type2 == IEEE80211_IF_TYPE_WDS) ||
2525 (type1 == IEEE80211_IF_TYPE_WDS &&
2526 (type2 == IEEE80211_IF_TYPE_WDS ||
2527 type2 == IEEE80211_IF_TYPE_AP)) ||
2528 (type1 == IEEE80211_IF_TYPE_AP &&
2529 type2 == IEEE80211_IF_TYPE_VLAN) ||
2530 (type1 == IEEE80211_IF_TYPE_VLAN &&
2531 (type2 == IEEE80211_IF_TYPE_AP ||
2532 type2 == IEEE80211_IF_TYPE_VLAN)));
2533 }
2534
2535 static int ieee80211_master_open(struct net_device *dev)
2536 {
2537 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2538 struct ieee80211_sub_if_data *sdata;
2539 int res = -EOPNOTSUPP;
2540
2541 read_lock(&local->sub_if_lock);
2542 list_for_each_entry(sdata, &local->sub_if_list, list) {
2543 if (sdata->dev != dev && netif_running(sdata->dev)) {
2544 res = 0;
2545 break;
2546 }
2547 }
2548 read_unlock(&local->sub_if_lock);
2549 return res;
2550 }
2551
2552 static int ieee80211_master_stop(struct net_device *dev)
2553 {
2554 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2555 struct ieee80211_sub_if_data *sdata;
2556
2557 read_lock(&local->sub_if_lock);
2558 list_for_each_entry(sdata, &local->sub_if_list, list)
2559 if (sdata->dev != dev && netif_running(sdata->dev))
2560 dev_close(sdata->dev);
2561 read_unlock(&local->sub_if_lock);
2562
2563 return 0;
2564 }
2565
2566 static int ieee80211_mgmt_open(struct net_device *dev)
2567 {
2568 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2569
2570 if (!netif_running(local->mdev))
2571 return -EOPNOTSUPP;
2572 return 0;
2573 }
2574
2575 static int ieee80211_mgmt_stop(struct net_device *dev)
2576 {
2577 return 0;
2578 }
2579
2580 /* Check if running monitor interfaces should go to a "soft monitor" mode
2581 * and switch them if necessary. */
2582 static inline void ieee80211_start_soft_monitor(struct ieee80211_local *local)
2583 {
2584 struct ieee80211_if_init_conf conf;
2585
2586 if (local->open_count && local->open_count == local->monitors &&
2587 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
2588 local->ops->remove_interface) {
2589 conf.if_id = -1;
2590 conf.type = IEEE80211_IF_TYPE_MNTR;
2591 conf.mac_addr = NULL;
2592 local->ops->remove_interface(local_to_hw(local), &conf);
2593 }
2594 }
2595
2596 /* Check if running monitor interfaces should go to a "hard monitor" mode
2597 * and switch them if necessary. */
2598 static void ieee80211_start_hard_monitor(struct ieee80211_local *local)
2599 {
2600 struct ieee80211_if_init_conf conf;
2601
2602 if (local->open_count && local->open_count == local->monitors &&
2603 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER) &&
2604 local->ops->add_interface) {
2605 conf.if_id = -1;
2606 conf.type = IEEE80211_IF_TYPE_MNTR;
2607 conf.mac_addr = NULL;
2608 local->ops->add_interface(local_to_hw(local), &conf);
2609 }
2610 }
2611
2612 static int ieee80211_open(struct net_device *dev)
2613 {
2614 struct ieee80211_sub_if_data *sdata, *nsdata;
2615 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2616 struct ieee80211_if_init_conf conf;
2617 int res;
2618
2619 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2620 read_lock(&local->sub_if_lock);
2621 list_for_each_entry(nsdata, &local->sub_if_list, list) {
2622 struct net_device *ndev = nsdata->dev;
2623
2624 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
2625 compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0 &&
2626 !identical_mac_addr_allowed(sdata->type, nsdata->type)) {
2627 read_unlock(&local->sub_if_lock);
2628 return -ENOTUNIQ;
2629 }
2630 }
2631 read_unlock(&local->sub_if_lock);
2632
2633 if (sdata->type == IEEE80211_IF_TYPE_WDS &&
2634 is_zero_ether_addr(sdata->u.wds.remote_addr))
2635 return -ENOLINK;
2636
2637 if (sdata->type == IEEE80211_IF_TYPE_MNTR && local->open_count &&
2638 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2639 /* run the interface in a "soft monitor" mode */
2640 local->monitors++;
2641 local->open_count++;
2642 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2643 return 0;
2644 }
2645 ieee80211_start_soft_monitor(local);
2646
2647 if (local->ops->add_interface) {
2648 conf.if_id = dev->ifindex;
2649 conf.type = sdata->type;
2650 conf.mac_addr = dev->dev_addr;
2651 res = local->ops->add_interface(local_to_hw(local), &conf);
2652 if (res) {
2653 if (sdata->type == IEEE80211_IF_TYPE_MNTR)
2654 ieee80211_start_hard_monitor(local);
2655 return res;
2656 }
2657 } else {
2658 if (sdata->type != IEEE80211_IF_TYPE_STA)
2659 return -EOPNOTSUPP;
2660 if (local->open_count > 0)
2661 return -ENOBUFS;
2662 }
2663
2664 if (local->open_count == 0) {
2665 res = 0;
2666 tasklet_enable(&local->tx_pending_tasklet);
2667 tasklet_enable(&local->tasklet);
2668 if (local->ops->open)
2669 res = local->ops->open(local_to_hw(local));
2670 if (res == 0) {
2671 res = dev_open(local->mdev);
2672 if (res) {
2673 if (local->ops->stop)
2674 local->ops->stop(local_to_hw(local));
2675 } else {
2676 res = ieee80211_hw_config(local);
2677 if (res && local->ops->stop)
2678 local->ops->stop(local_to_hw(local));
2679 else if (!res && local->apdev)
2680 dev_open(local->apdev);
2681 }
2682 }
2683 if (res) {
2684 if (local->ops->remove_interface)
2685 local->ops->remove_interface(local_to_hw(local),
2686 &conf);
2687 return res;
2688 }
2689 }
2690 local->open_count++;
2691
2692 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2693 local->monitors++;
2694 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
2695 } else
2696 ieee80211_if_config(dev);
2697
2698 if (sdata->type == IEEE80211_IF_TYPE_STA &&
2699 !local->user_space_mlme)
2700 netif_carrier_off(dev);
2701 else
2702 netif_carrier_on(dev);
2703
2704 netif_start_queue(dev);
2705 return 0;
2706 }
2707
2708
2709 static int ieee80211_stop(struct net_device *dev)
2710 {
2711 struct ieee80211_sub_if_data *sdata;
2712 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2713
2714 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2715
2716 if (sdata->type == IEEE80211_IF_TYPE_MNTR &&
2717 local->open_count > 1 &&
2718 !(local->hw.flags & IEEE80211_HW_MONITOR_DURING_OPER)) {
2719 /* remove "soft monitor" interface */
2720 local->open_count--;
2721 local->monitors--;
2722 if (!local->monitors)
2723 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2724 return 0;
2725 }
2726
2727 netif_stop_queue(dev);
2728 ieee80211_if_shutdown(dev);
2729
2730 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
2731 local->monitors--;
2732 if (!local->monitors)
2733 local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
2734 }
2735
2736 local->open_count--;
2737 if (local->open_count == 0) {
2738 if (netif_running(local->mdev))
2739 dev_close(local->mdev);
2740 if (local->apdev)
2741 dev_close(local->apdev);
2742 if (local->ops->stop)
2743 local->ops->stop(local_to_hw(local));
2744 tasklet_disable(&local->tx_pending_tasklet);
2745 tasklet_disable(&local->tasklet);
2746 }
2747 if (local->ops->remove_interface) {
2748 struct ieee80211_if_init_conf conf;
2749
2750 conf.if_id = dev->ifindex;
2751 conf.type = sdata->type;
2752 conf.mac_addr = dev->dev_addr;
2753 local->ops->remove_interface(local_to_hw(local), &conf);
2754 }
2755
2756 ieee80211_start_hard_monitor(local);
2757
2758 return 0;
2759 }
2760
2761
2762 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
2763 {
2764 memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
2765 return ETH_ALEN;
2766 }
2767
2768 static inline int ieee80211_bssid_match(const u8 *raddr, const u8 *addr)
2769 {
2770 return compare_ether_addr(raddr, addr) == 0 ||
2771 is_broadcast_ether_addr(raddr);
2772 }
2773
2774
2775 static ieee80211_txrx_result
2776 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
2777 {
2778 struct net_device *dev = rx->dev;
2779 struct ieee80211_local *local = rx->local;
2780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
2781 u16 fc, hdrlen, ethertype;
2782 u8 *payload;
2783 u8 dst[ETH_ALEN];
2784 u8 src[ETH_ALEN];
2785 struct sk_buff *skb = rx->skb, *skb2;
2786 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2787
2788 fc = rx->fc;
2789 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
2790 return TXRX_CONTINUE;
2791
2792 if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
2793 return TXRX_DROP;
2794
2795 hdrlen = ieee80211_get_hdrlen(fc);
2796
2797 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
2798 * header
2799 * IEEE 802.11 address fields:
2800 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
2801 * 0 0 DA SA BSSID n/a
2802 * 0 1 DA BSSID SA n/a
2803 * 1 0 BSSID SA DA n/a
2804 * 1 1 RA TA DA SA
2805 */
2806
2807 switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
2808 case IEEE80211_FCTL_TODS:
2809 /* BSSID SA DA */
2810 memcpy(dst, hdr->addr3, ETH_ALEN);
2811 memcpy(src, hdr->addr2, ETH_ALEN);
2812
2813 if (unlikely(sdata->type != IEEE80211_IF_TYPE_AP &&
2814 sdata->type != IEEE80211_IF_TYPE_VLAN)) {
2815 printk(KERN_DEBUG "%s: dropped ToDS frame (BSSID="
2816 MAC_FMT " SA=" MAC_FMT " DA=" MAC_FMT ")\n",
2817 dev->name, MAC_ARG(hdr->addr1),
2818 MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3));
2819 return TXRX_DROP;
2820 }
2821 break;
2822 case (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
2823 /* RA TA DA SA */
2824 memcpy(dst, hdr->addr3, ETH_ALEN);
2825 memcpy(src, hdr->addr4, ETH_ALEN);
2826
2827 if (unlikely(sdata->type != IEEE80211_IF_TYPE_WDS)) {
2828 printk(KERN_DEBUG "%s: dropped FromDS&ToDS frame (RA="
2829 MAC_FMT " TA=" MAC_FMT " DA=" MAC_FMT " SA="
2830 MAC_FMT ")\n",
2831 rx->dev->name, MAC_ARG(hdr->addr1),
2832 MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr3),
2833 MAC_ARG(hdr->addr4));
2834 return TXRX_DROP;
2835 }
2836 break;
2837 case IEEE80211_FCTL_FROMDS:
2838 /* DA BSSID SA */
2839 memcpy(dst, hdr->addr1, ETH_ALEN);
2840 memcpy(src, hdr->addr3, ETH_ALEN);
2841
2842 if (sdata->type != IEEE80211_IF_TYPE_STA) {
2843 return TXRX_DROP;
2844 }
2845 break;
2846 case 0:
2847 /* DA SA BSSID */
2848 memcpy(dst, hdr->addr1, ETH_ALEN);
2849 memcpy(src, hdr->addr2, ETH_ALEN);
2850
2851 if (sdata->type != IEEE80211_IF_TYPE_IBSS) {
2852 if (net_ratelimit()) {
2853 printk(KERN_DEBUG "%s: dropped IBSS frame (DA="
2854 MAC_FMT " SA=" MAC_FMT " BSSID=" MAC_FMT
2855 ")\n",
2856 dev->name, MAC_ARG(hdr->addr1),
2857 MAC_ARG(hdr->addr2),
2858 MAC_ARG(hdr->addr3));
2859 }
2860 return TXRX_DROP;
2861 }
2862 break;
2863 }
2864
2865 payload = skb->data + hdrlen;
2866
2867 if (unlikely(skb->len - hdrlen < 8)) {
2868 if (net_ratelimit()) {
2869 printk(KERN_DEBUG "%s: RX too short data frame "
2870 "payload\n", dev->name);
2871 }
2872 return TXRX_DROP;
2873 }
2874
2875 ethertype = (payload[6] << 8) | payload[7];
2876
2877 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
2878 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
2879 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
2880 /* remove RFC1042 or Bridge-Tunnel encapsulation and
2881 * replace EtherType */
2882 skb_pull(skb, hdrlen + 6);
2883 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
2884 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
2885 } else {
2886 struct ethhdr *ehdr;
2887 __be16 len;
2888 skb_pull(skb, hdrlen);
2889 len = htons(skb->len);
2890 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
2891 memcpy(ehdr->h_dest, dst, ETH_ALEN);
2892 memcpy(ehdr->h_source, src, ETH_ALEN);
2893 ehdr->h_proto = len;
2894 }
2895 skb->dev = dev;
2896
2897 skb2 = NULL;
2898
2899 sdata->stats.rx_packets++;
2900 sdata->stats.rx_bytes += skb->len;
2901
2902 if (local->bridge_packets && (sdata->type == IEEE80211_IF_TYPE_AP
2903 || sdata->type == IEEE80211_IF_TYPE_VLAN) && rx->u.rx.ra_match) {
2904 if (is_multicast_ether_addr(skb->data)) {
2905 /* send multicast frames both to higher layers in
2906 * local net stack and back to the wireless media */
2907 skb2 = skb_copy(skb, GFP_ATOMIC);
2908 if (!skb2)
2909 printk(KERN_DEBUG "%s: failed to clone "
2910 "multicast frame\n", dev->name);
2911 } else {
2912 struct sta_info *dsta;
2913 dsta = sta_info_get(local, skb->data);
2914 if (dsta && !dsta->dev) {
2915 printk(KERN_DEBUG "Station with null dev "
2916 "structure!\n");
2917 } else if (dsta && dsta->dev == dev) {
2918 /* Destination station is associated to this
2919 * AP, so send the frame directly to it and
2920 * do not pass the frame to local net stack.
2921 */
2922 skb2 = skb;
2923 skb = NULL;
2924 }
2925 if (dsta)
2926 sta_info_put(dsta);
2927 }
2928 }
2929
2930 if (skb) {
2931 /* deliver to local stack */
2932 skb->protocol = eth_type_trans(skb, dev);
2933 memset(skb->cb, 0, sizeof(skb->cb));
2934 netif_rx(skb);
2935 }
2936
2937 if (skb2) {
2938 /* send to wireless media */
2939 skb2->protocol = __constant_htons(ETH_P_802_3);
2940 skb_set_network_header(skb2, 0);
2941 skb_set_mac_header(skb2, 0);
2942 dev_queue_xmit(skb2);
2943 }
2944
2945 return TXRX_QUEUED;
2946 }
2947
2948
2949 static struct ieee80211_rate *
2950 ieee80211_get_rate(struct ieee80211_local *local, int phymode, int hw_rate)
2951 {
2952 struct ieee80211_hw_mode *mode;
2953 int r;
2954
2955 list_for_each_entry(mode, &local->modes_list, list) {
2956 if (mode->mode != phymode)
2957 continue;
2958 for (r = 0; r < mode->num_rates; r++) {
2959 struct ieee80211_rate *rate = &mode->rates[r];
2960 if (rate->val == hw_rate ||
2961 (rate->flags & IEEE80211_RATE_PREAMBLE2 &&
2962 rate->val2 == hw_rate))
2963 return rate;
2964 }
2965 }
2966
2967 return NULL;
2968 }
2969
2970 static void
2971 ieee80211_fill_frame_info(struct ieee80211_local *local,
2972 struct ieee80211_frame_info *fi,
2973 struct ieee80211_rx_status *status)
2974 {
2975 if (status) {
2976 struct timespec ts;
2977 struct ieee80211_rate *rate;
2978
2979 jiffies_to_timespec(jiffies, &ts);
2980 fi->hosttime = cpu_to_be64((u64) ts.tv_sec * 1000000 +
2981 ts.tv_nsec / 1000);
2982 fi->mactime = cpu_to_be64(status->mactime);
2983 switch (status->phymode) {
2984 case MODE_IEEE80211A:
2985 fi->phytype = htonl(ieee80211_phytype_ofdm_dot11_a);
2986 break;
2987 case MODE_IEEE80211B:
2988 fi->phytype = htonl(ieee80211_phytype_dsss_dot11_b);
2989 break;
2990 case MODE_IEEE80211G:
2991 fi->phytype = htonl(ieee80211_phytype_pbcc_dot11_g);
2992 break;
2993 case MODE_ATHEROS_TURBO:
2994 fi->phytype =
2995 htonl(ieee80211_phytype_dsss_dot11_turbo);
2996 break;
2997 default:
2998 fi->phytype = htonl(0xAAAAAAAA);
2999 break;
3000 }
3001 fi->channel = htonl(status->channel);
3002 rate = ieee80211_get_rate(local, status->phymode,
3003 status->rate);
3004 if (rate) {
3005 fi->datarate = htonl(rate->rate);
3006 if (rate->flags & IEEE80211_RATE_PREAMBLE2) {
3007 if (status->rate == rate->val)
3008 fi->preamble = htonl(2); /* long */
3009 else if (status->rate == rate->val2)
3010 fi->preamble = htonl(1); /* short */
3011 } else
3012 fi->preamble = htonl(0);
3013 } else {
3014 fi->datarate = htonl(0);
3015 fi->preamble = htonl(0);
3016 }
3017
3018 fi->antenna = htonl(status->antenna);
3019 fi->priority = htonl(0xffffffff); /* no clue */
3020 fi->ssi_type = htonl(ieee80211_ssi_raw);
3021 fi->ssi_signal = htonl(status->ssi);
3022 fi->ssi_noise = 0x00000000;
3023 fi->encoding = 0;
3024 } else {
3025 /* clear everything because we really don't know.
3026 * the msg_type field isn't present on monitor frames
3027 * so we don't know whether it will be present or not,
3028 * but it's ok to not clear it since it'll be assigned
3029 * anyway */
3030 memset(fi, 0, sizeof(*fi) - sizeof(fi->msg_type));
3031
3032 fi->ssi_type = htonl(ieee80211_ssi_none);
3033 }
3034 fi->version = htonl(IEEE80211_FI_VERSION);
3035 fi->length = cpu_to_be32(sizeof(*fi) - sizeof(fi->msg_type));
3036 }
3037
3038 /* this routine is actually not just for this, but also
3039 * for pushing fake 'management' frames into userspace.
3040 * it shall be replaced by a netlink-based system. */
3041 void
3042 ieee80211_rx_mgmt(struct ieee80211_local *local, struct sk_buff *skb,
3043 struct ieee80211_rx_status *status, u32 msg_type)
3044 {
3045 struct ieee80211_frame_info *fi;
3046 const size_t hlen = sizeof(struct ieee80211_frame_info);
3047 struct ieee80211_sub_if_data *sdata;
3048
3049 skb->dev = local->apdev;
3050
3051 sdata = IEEE80211_DEV_TO_SUB_IF(local->apdev);
3052
3053 if (skb_headroom(skb) < hlen) {
3054 I802_DEBUG_INC(local->rx_expand_skb_head);
3055 if (pskb_expand_head(skb, hlen, 0, GFP_ATOMIC)) {
3056 dev_kfree_skb(skb);
3057 return;
3058 }
3059 }
3060
3061 fi = (struct ieee80211_frame_info *) skb_push(skb, hlen);
3062
3063 ieee80211_fill_frame_info(local, fi, status);
3064 fi->msg_type = htonl(msg_type);
3065
3066 sdata->stats.rx_packets++;
3067 sdata->stats.rx_bytes += skb->len;
3068
3069 skb_set_mac_header(skb, 0);
3070 skb->ip_summed = CHECKSUM_UNNECESSARY;
3071 skb->pkt_type = PACKET_OTHERHOST;
3072 skb->protocol = htons(ETH_P_802_2);
3073 memset(skb->cb, 0, sizeof(skb->cb));
3074 netif_rx(skb);
3075 }
3076
3077 static void
3078 ieee80211_rx_monitor(struct net_device *dev, struct sk_buff *skb,
3079 struct ieee80211_rx_status *status)
3080 {
3081 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3082 struct ieee80211_sub_if_data *sdata;
3083 struct ieee80211_rate *rate;
3084 struct ieee80211_rtap_hdr {
3085 struct ieee80211_radiotap_header hdr;
3086 u8 flags;
3087 u8 rate;
3088 __le16 chan_freq;
3089 __le16 chan_flags;
3090 u8 antsignal;
3091 } __attribute__ ((packed)) *rthdr;
3092
3093 skb->dev = dev;
3094
3095 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3096
3097 if (status->flag & RX_FLAG_RADIOTAP)
3098 goto out;
3099
3100 if (skb_headroom(skb) < sizeof(*rthdr)) {
3101 I802_DEBUG_INC(local->rx_expand_skb_head);
3102 if (pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) {
3103 dev_kfree_skb(skb);
3104 return;
3105 }
3106 }
3107
3108 rthdr = (struct ieee80211_rtap_hdr *) skb_push(skb, sizeof(*rthdr));
3109 memset(rthdr, 0, sizeof(*rthdr));
3110 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
3111 rthdr->hdr.it_present =
3112 cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
3113 (1 << IEEE80211_RADIOTAP_RATE) |
3114 (1 << IEEE80211_RADIOTAP_CHANNEL) |
3115 (1 << IEEE80211_RADIOTAP_DB_ANTSIGNAL));
3116 rthdr->flags = local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS ?
3117 IEEE80211_RADIOTAP_F_FCS : 0;
3118 rate = ieee80211_get_rate(local, status->phymode, status->rate);
3119 if (rate)
3120 rthdr->rate = rate->rate / 5;
3121 rthdr->chan_freq = cpu_to_le16(status->freq);
3122 rthdr->chan_flags =
3123 status->phymode == MODE_IEEE80211A ?
3124 cpu_to_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ) :
3125 cpu_to_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ);
3126 rthdr->antsignal = status->ssi;
3127
3128 out:
3129 sdata->stats.rx_packets++;
3130 sdata->stats.rx_bytes += skb->len;
3131
3132 skb_set_mac_header(skb, 0);
3133 skb->ip_summed = CHECKSUM_UNNECESSARY;
3134 skb->pkt_type = PACKET_OTHERHOST;
3135 skb->protocol = htons(ETH_P_802_2);
3136 memset(skb->cb, 0, sizeof(skb->cb));
3137 netif_rx(skb);
3138 }
3139
3140 int ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
3141 int radar, int radar_type)
3142 {
3143 struct sk_buff *skb;
3144 struct ieee80211_radar_info *msg;
3145 struct ieee80211_local *local = hw_to_local(hw);
3146
3147 if (!local->apdev)
3148 return 0;
3149
3150 skb = dev_alloc_skb(sizeof(struct ieee80211_frame_info) +
3151 sizeof(struct ieee80211_radar_info));
3152
3153 if (!skb)
3154 return -ENOMEM;
3155 skb_reserve(skb, sizeof(struct ieee80211_frame_info));
3156
3157 msg = (struct ieee80211_radar_info *)
3158 skb_put(skb, sizeof(struct ieee80211_radar_info));
3159 msg->channel = channel;
3160 msg->radar = radar;
3161 msg->radar_type = radar_type;
3162
3163 ieee80211_rx_mgmt(local, skb, NULL, ieee80211_msg_radar);
3164 return 0;
3165 }
3166 EXPORT_SYMBOL(ieee80211_radar_status);
3167
3168
3169 static void ap_sta_ps_start(struct net_device *dev, struct sta_info *sta)
3170 {
3171 struct ieee80211_sub_if_data *sdata;
3172 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3173
3174 if (sdata->bss)
3175 atomic_inc(&sdata->bss->num_sta_ps);
3176 sta->flags |= WLAN_STA_PS;
3177 sta->pspoll = 0;
3178 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3179 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d enters power "
3180 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3181 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3182 }
3183
3184
3185 static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
3186 {
3187 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
3188 struct sk_buff *skb;
3189 int sent = 0;
3190 struct ieee80211_sub_if_data *sdata;
3191 struct ieee80211_tx_packet_data *pkt_data;
3192
3193 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
3194 if (sdata->bss)
3195 atomic_dec(&sdata->bss->num_sta_ps);
3196 sta->flags &= ~(WLAN_STA_PS | WLAN_STA_TIM);
3197 sta->pspoll = 0;
3198 if (!skb_queue_empty(&sta->ps_tx_buf)) {
3199 if (local->ops->set_tim)
3200 local->ops->set_tim(local_to_hw(local), sta->aid, 0);
3201 if (sdata->bss)
3202 bss_tim_clear(local, sdata->bss, sta->aid);
3203 }
3204 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3205 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d exits power "
3206 "save mode\n", dev->name, MAC_ARG(sta->addr), sta->aid);
3207 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3208 /* Send all buffered frames to the station */
3209 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
3210 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3211 sent++;
3212 pkt_data->requeue = 1;
3213 dev_queue_xmit(skb);
3214 }
3215 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
3216 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
3217 local->total_ps_buffered--;
3218 sent++;
3219 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3220 printk(KERN_DEBUG "%s: STA " MAC_FMT " aid %d send PS frame "
3221 "since STA not sleeping anymore\n", dev->name,
3222 MAC_ARG(sta->addr), sta->aid);
3223 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3224 pkt_data->requeue = 1;
3225 dev_queue_xmit(skb);
3226 }
3227
3228 return sent;
3229 }
3230
3231
3232 static ieee80211_txrx_result
3233 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
3234 {
3235 struct sk_buff *skb;
3236 int no_pending_pkts;
3237
3238 if (likely(!rx->sta ||
3239 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
3240 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
3241 !rx->u.rx.ra_match))
3242 return TXRX_CONTINUE;
3243
3244 skb = skb_dequeue(&rx->sta->tx_filtered);
3245 if (!skb) {
3246 skb = skb_dequeue(&rx->sta->ps_tx_buf);
3247 if (skb)
3248 rx->local->total_ps_buffered--;
3249 }
3250 no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) &&
3251 skb_queue_empty(&rx->sta->ps_tx_buf);
3252
3253 if (skb) {
3254 struct ieee80211_hdr *hdr =
3255 (struct ieee80211_hdr *) skb->data;
3256
3257 /* tell TX path to send one frame even though the STA may
3258 * still remain is PS mode after this frame exchange */
3259 rx->sta->pspoll = 1;
3260
3261 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3262 printk(KERN_DEBUG "STA " MAC_FMT " aid %d: PS Poll (entries "
3263 "after %d)\n",
3264 MAC_ARG(rx->sta->addr), rx->sta->aid,
3265 skb_queue_len(&rx->sta->ps_tx_buf));
3266 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3267
3268 /* Use MoreData flag to indicate whether there are more
3269 * buffered frames for this STA */
3270 if (no_pending_pkts) {
3271 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
3272 rx->sta->flags &= ~WLAN_STA_TIM;
3273 } else
3274 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3275
3276 dev_queue_xmit(skb);
3277
3278 if (no_pending_pkts) {
3279 if (rx->local->ops->set_tim)
3280 rx->local->ops->set_tim(local_to_hw(rx->local),
3281 rx->sta->aid, 0);
3282 if (rx->sdata->bss)
3283 bss_tim_clear(rx->local, rx->sdata->bss, rx->sta->aid);
3284 }
3285 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
3286 } else if (!rx->u.rx.sent_ps_buffered) {
3287 printk(KERN_DEBUG "%s: STA " MAC_FMT " sent PS Poll even "
3288 "though there is no buffered frames for it\n",
3289 rx->dev->name, MAC_ARG(rx->sta->addr));
3290 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
3291
3292 }
3293
3294 /* Free PS Poll skb here instead of returning TXRX_DROP that would
3295 * count as an dropped frame. */
3296 dev_kfree_skb(rx->skb);
3297
3298 return TXRX_QUEUED;
3299 }
3300
3301
3302 static inline struct ieee80211_fragment_entry *
3303 ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
3304 unsigned int frag, unsigned int seq, int rx_queue,
3305 struct sk_buff **skb)
3306 {
3307 struct ieee80211_fragment_entry *entry;
3308 int idx;
3309
3310 idx = sdata->fragment_next;
3311 entry = &sdata->fragments[sdata->fragment_next++];
3312 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
3313 sdata->fragment_next = 0;
3314
3315 if (!skb_queue_empty(&entry->skb_list)) {
3316 #ifdef CONFIG_MAC80211_DEBUG
3317 struct ieee80211_hdr *hdr =
3318 (struct ieee80211_hdr *) entry->skb_list.next->data;
3319 printk(KERN_DEBUG "%s: RX reassembly removed oldest "
3320 "fragment entry (idx=%d age=%lu seq=%d last_frag=%d "
3321 "addr1=" MAC_FMT " addr2=" MAC_FMT "\n",
3322 sdata->dev->name, idx,
3323 jiffies - entry->first_frag_time, entry->seq,
3324 entry->last_frag, MAC_ARG(hdr->addr1),
3325 MAC_ARG(hdr->addr2));
3326 #endif /* CONFIG_MAC80211_DEBUG */
3327 __skb_queue_purge(&entry->skb_list);
3328 }
3329
3330 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
3331 *skb = NULL;
3332 entry->first_frag_time = jiffies;
3333 entry->seq = seq;
3334 entry->rx_queue = rx_queue;
3335 entry->last_frag = frag;
3336 entry->ccmp = 0;
3337 entry->extra_len = 0;
3338
3339 return entry;
3340 }
3341
3342
3343 static inline struct ieee80211_fragment_entry *
3344 ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
3345 u16 fc, unsigned int frag, unsigned int seq,
3346 int rx_queue, struct ieee80211_hdr *hdr)
3347 {
3348 struct ieee80211_fragment_entry *entry;
3349 int i, idx;
3350
3351 idx = sdata->fragment_next;
3352 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
3353 struct ieee80211_hdr *f_hdr;
3354 u16 f_fc;
3355
3356 idx--;
3357 if (idx < 0)
3358 idx = IEEE80211_FRAGMENT_MAX - 1;
3359
3360 entry = &sdata->fragments[idx];
3361 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
3362 entry->rx_queue != rx_queue ||
3363 entry->last_frag + 1 != frag)
3364 continue;
3365
3366 f_hdr = (struct ieee80211_hdr *) entry->skb_list.next->data;
3367 f_fc = le16_to_cpu(f_hdr->frame_control);
3368
3369 if ((fc & IEEE80211_FCTL_FTYPE) != (f_fc & IEEE80211_FCTL_FTYPE) ||
3370 compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 ||
3371 compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0)
3372 continue;
3373
3374 if (entry->first_frag_time + 2 * HZ < jiffies) {
3375 __skb_queue_purge(&entry->skb_list);
3376 continue;
3377 }
3378 return entry;
3379 }
3380
3381 return NULL;
3382 }
3383
3384
3385 static ieee80211_txrx_result
3386 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
3387 {
3388 struct ieee80211_hdr *hdr;
3389 u16 sc;
3390 unsigned int frag, seq;
3391 struct ieee80211_fragment_entry *entry;
3392 struct sk_buff *skb;
3393
3394 hdr = (struct ieee80211_hdr *) rx->skb->data;
3395 sc = le16_to_cpu(hdr->seq_ctrl);
3396 frag = sc & IEEE80211_SCTL_FRAG;
3397
3398 if (likely((!(rx->fc & IEEE80211_FCTL_MOREFRAGS) && frag == 0) ||
3399 (rx->skb)->len < 24 ||
3400 is_multicast_ether_addr(hdr->addr1))) {
3401 /* not fragmented */
3402 goto out;
3403 }
3404 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
3405
3406 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
3407
3408 if (frag == 0) {
3409 /* This is the first fragment of a new frame. */
3410 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
3411 rx->u.rx.queue, &(rx->skb));
3412 if (rx->key && rx->key->alg == ALG_CCMP &&
3413 (rx->fc & IEEE80211_FCTL_PROTECTED)) {
3414 /* Store CCMP PN so that we can verify that the next
3415 * fragment has a sequential PN value. */
3416 entry->ccmp = 1;
3417 memcpy(entry->last_pn,
3418 rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
3419 CCMP_PN_LEN);
3420 }
3421 return TXRX_QUEUED;
3422 }
3423
3424 /* This is a fragment for a frame that should already be pending in
3425 * fragment cache. Add this fragment to the end of the pending entry.
3426 */
3427 entry = ieee80211_reassemble_find(rx->sdata, rx->fc, frag, seq,
3428 rx->u.rx.queue, hdr);
3429 if (!entry) {
3430 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3431 return TXRX_DROP;
3432 }
3433
3434 /* Verify that MPDUs within one MSDU have sequential PN values.
3435 * (IEEE 802.11i, 8.3.3.4.5) */
3436 if (entry->ccmp) {
3437 int i;
3438 u8 pn[CCMP_PN_LEN], *rpn;
3439 if (!rx->key || rx->key->alg != ALG_CCMP)
3440 return TXRX_DROP;
3441 memcpy(pn, entry->last_pn, CCMP_PN_LEN);
3442 for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
3443 pn[i]++;
3444 if (pn[i])
3445 break;
3446 }
3447 rpn = rx->key->u.ccmp.rx_pn[rx->u.rx.queue];
3448 if (memcmp(pn, rpn, CCMP_PN_LEN) != 0) {
3449 printk(KERN_DEBUG "%s: defrag: CCMP PN not sequential"
3450 " A2=" MAC_FMT " PN=%02x%02x%02x%02x%02x%02x "
3451 "(expected %02x%02x%02x%02x%02x%02x)\n",
3452 rx->dev->name, MAC_ARG(hdr->addr2),
3453 rpn[0], rpn[1], rpn[2], rpn[3], rpn[4], rpn[5],
3454 pn[0], pn[1], pn[2], pn[3], pn[4], pn[5]);
3455 return TXRX_DROP;
3456 }
3457 memcpy(entry->last_pn, pn, CCMP_PN_LEN);
3458 }
3459
3460 skb_pull(rx->skb, ieee80211_get_hdrlen(rx->fc));
3461 __skb_queue_tail(&entry->skb_list, rx->skb);
3462 entry->last_frag = frag;
3463 entry->extra_len += rx->skb->len;
3464 if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
3465 rx->skb = NULL;
3466 return TXRX_QUEUED;
3467 }
3468
3469 rx->skb = __skb_dequeue(&entry->skb_list);
3470 if (skb_tailroom(rx->skb) < entry->extra_len) {
3471 I802_DEBUG_INC(rx->local->rx_expand_skb_head2);
3472 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
3473 GFP_ATOMIC))) {
3474 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
3475 __skb_queue_purge(&entry->skb_list);
3476 return TXRX_DROP;
3477 }
3478 }
3479 while ((skb = __skb_dequeue(&entry->skb_list))) {
3480 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
3481 dev_kfree_skb(skb);
3482 }
3483
3484 /* Complete frame has been reassembled - process it now */
3485 rx->fragmented = 1;
3486
3487 out:
3488 if (rx->sta)
3489 rx->sta->rx_packets++;
3490 if (is_multicast_ether_addr(hdr->addr1))
3491 rx->local->dot11MulticastReceivedFrameCount++;
3492 else
3493 ieee80211_led_rx(rx->local);
3494 return TXRX_CONTINUE;
3495 }
3496
3497
3498 static ieee80211_txrx_result
3499 ieee80211_rx_h_monitor(struct ieee80211_txrx_data *rx)
3500 {
3501 if (rx->sdata->type == IEEE80211_IF_TYPE_MNTR) {
3502 ieee80211_rx_monitor(rx->dev, rx->skb, rx->u.rx.status);
3503 return TXRX_QUEUED;
3504 }
3505
3506 if (rx->u.rx.status->flag & RX_FLAG_RADIOTAP)
3507 skb_pull(rx->skb, ieee80211_get_radiotap_len(rx->skb));
3508
3509 return TXRX_CONTINUE;
3510 }
3511
3512
3513 static ieee80211_txrx_result
3514 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
3515 {
3516 struct ieee80211_hdr *hdr;
3517 int always_sta_key;
3518 hdr = (struct ieee80211_hdr *) rx->skb->data;
3519
3520 /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
3521 if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
3522 if (unlikely(rx->fc & IEEE80211_FCTL_RETRY &&
3523 rx->sta->last_seq_ctrl[rx->u.rx.queue] ==
3524 hdr->seq_ctrl)) {
3525 if (rx->u.rx.ra_match) {
3526 rx->local->dot11FrameDuplicateCount++;
3527 rx->sta->num_duplicates++;
3528 }
3529 return TXRX_DROP;
3530 } else
3531 rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
3532 }
3533
3534 if ((rx->local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) &&
3535 rx->skb->len > FCS_LEN)
3536 skb_trim(rx->skb, rx->skb->len - FCS_LEN);
3537
3538 if (unlikely(rx->skb->len < 16)) {
3539 I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
3540 return TXRX_DROP;
3541 }
3542
3543 if (!rx->u.rx.ra_match)
3544 rx->skb->pkt_type = PACKET_OTHERHOST;
3545 else if (compare_ether_addr(rx->dev->dev_addr, hdr->addr1) == 0)
3546 rx->skb->pkt_type = PACKET_HOST;
3547 else if (is_multicast_ether_addr(hdr->addr1)) {
3548 if (is_broadcast_ether_addr(hdr->addr1))
3549 rx->skb->pkt_type = PACKET_BROADCAST;
3550 else
3551 rx->skb->pkt_type = PACKET_MULTICAST;
3552 } else
3553 rx->skb->pkt_type = PACKET_OTHERHOST;
3554
3555 /* Drop disallowed frame classes based on STA auth/assoc state;
3556 * IEEE 802.11, Chap 5.5.
3557 *
3558 * 80211.o does filtering only based on association state, i.e., it
3559 * drops Class 3 frames from not associated stations. hostapd sends
3560 * deauth/disassoc frames when needed. In addition, hostapd is
3561 * responsible for filtering on both auth and assoc states.
3562 */
3563 if (unlikely(((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA ||
3564 ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL &&
3565 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL)) &&
3566 rx->sdata->type != IEEE80211_IF_TYPE_IBSS &&
3567 (!rx->sta || !(rx->sta->flags & WLAN_STA_ASSOC)))) {
3568 if ((!(rx->fc & IEEE80211_FCTL_FROMDS) &&
3569 !(rx->fc & IEEE80211_FCTL_TODS) &&
3570 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA)
3571 || !rx->u.rx.ra_match) {
3572 /* Drop IBSS frames and frames for other hosts
3573 * silently. */
3574 return TXRX_DROP;
3575 }
3576
3577 if (!rx->local->apdev)
3578 return TXRX_DROP;
3579
3580 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3581 ieee80211_msg_sta_not_assoc);
3582 return TXRX_QUEUED;
3583 }
3584
3585 if (rx->sdata->type == IEEE80211_IF_TYPE_STA)
3586 always_sta_key = 0;
3587 else
3588 always_sta_key = 1;
3589
3590 if (rx->sta && rx->sta->key && always_sta_key) {
3591 rx->key = rx->sta->key;
3592 } else {
3593 if (rx->sta && rx->sta->key)
3594 rx->key = rx->sta->key;
3595 else
3596 rx->key = rx->sdata->default_key;
3597
3598 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3599 rx->fc & IEEE80211_FCTL_PROTECTED) {
3600 int keyidx = ieee80211_wep_get_keyidx(rx->skb);
3601
3602 if (keyidx >= 0 && keyidx < NUM_DEFAULT_KEYS &&
3603 (!rx->sta || !rx->sta->key || keyidx > 0))
3604 rx->key = rx->sdata->keys[keyidx];
3605
3606 if (!rx->key) {
3607 if (!rx->u.rx.ra_match)
3608 return TXRX_DROP;
3609 printk(KERN_DEBUG "%s: RX WEP frame with "
3610 "unknown keyidx %d (A1=" MAC_FMT " A2="
3611 MAC_FMT " A3=" MAC_FMT ")\n",
3612 rx->dev->name, keyidx,
3613 MAC_ARG(hdr->addr1),
3614 MAC_ARG(hdr->addr2),
3615 MAC_ARG(hdr->addr3));
3616 if (!rx->local->apdev)
3617 return TXRX_DROP;
3618 ieee80211_rx_mgmt(
3619 rx->local, rx->skb, rx->u.rx.status,
3620 ieee80211_msg_wep_frame_unknown_key);
3621 return TXRX_QUEUED;
3622 }
3623 }
3624 }
3625
3626 if (rx->fc & IEEE80211_FCTL_PROTECTED && rx->key && rx->u.rx.ra_match) {
3627 rx->key->tx_rx_count++;
3628 if (unlikely(rx->local->key_tx_rx_threshold &&
3629 rx->key->tx_rx_count >
3630 rx->local->key_tx_rx_threshold)) {
3631 ieee80211_key_threshold_notify(rx->dev, rx->key,
3632 rx->sta);
3633 }
3634 }
3635
3636 return TXRX_CONTINUE;
3637 }
3638
3639
3640 static ieee80211_txrx_result
3641 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
3642 {
3643 struct sta_info *sta = rx->sta;
3644 struct net_device *dev = rx->dev;
3645 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
3646
3647 if (!sta)
3648 return TXRX_CONTINUE;
3649
3650 /* Update last_rx only for IBSS packets which are for the current
3651 * BSSID to avoid keeping the current IBSS network alive in cases where
3652 * other STAs are using different BSSID. */
3653 if (rx->sdata->type == IEEE80211_IF_TYPE_IBSS) {
3654 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len);
3655 if (compare_ether_addr(bssid, rx->sdata->u.sta.bssid) == 0)
3656 sta->last_rx = jiffies;
3657 } else
3658 if (!is_multicast_ether_addr(hdr->addr1) ||
3659 rx->sdata->type == IEEE80211_IF_TYPE_STA) {
3660 /* Update last_rx only for unicast frames in order to prevent
3661 * the Probe Request frames (the only broadcast frames from a
3662 * STA in infrastructure mode) from keeping a connection alive.
3663 */
3664 sta->last_rx = jiffies;
3665 }
3666
3667 if (!rx->u.rx.ra_match)
3668 return TXRX_CONTINUE;
3669
3670 sta->rx_fragments++;
3671 sta->rx_bytes += rx->skb->len;
3672 sta->last_rssi = (sta->last_rssi * 15 +
3673 rx->u.rx.status->ssi) / 16;
3674 sta->last_signal = (sta->last_signal * 15 +
3675 rx->u.rx.status->signal) / 16;
3676 sta->last_noise = (sta->last_noise * 15 +
3677 rx->u.rx.status->noise) / 16;
3678
3679 if (!(rx->fc & IEEE80211_FCTL_MOREFRAGS)) {
3680 /* Change STA power saving mode only in the end of a frame
3681 * exchange sequence */
3682 if ((sta->flags & WLAN_STA_PS) && !(rx->fc & IEEE80211_FCTL_PM))
3683 rx->u.rx.sent_ps_buffered += ap_sta_ps_end(dev, sta);
3684 else if (!(sta->flags & WLAN_STA_PS) &&
3685 (rx->fc & IEEE80211_FCTL_PM))
3686 ap_sta_ps_start(dev, sta);
3687 }
3688
3689 /* Drop data::nullfunc frames silently, since they are used only to
3690 * control station power saving mode. */
3691 if ((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3692 (rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_NULLFUNC) {
3693 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
3694 /* Update counter and free packet here to avoid counting this
3695 * as a dropped packed. */
3696 sta->rx_packets++;
3697 dev_kfree_skb(rx->skb);
3698 return TXRX_QUEUED;
3699 }
3700
3701 return TXRX_CONTINUE;
3702 } /* ieee80211_rx_h_sta_process */
3703
3704
3705 static ieee80211_txrx_result
3706 ieee80211_rx_h_wep_weak_iv_detection(struct ieee80211_txrx_data *rx)
3707 {
3708 if (!rx->sta || !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3709 (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
3710 !rx->key || rx->key->alg != ALG_WEP || !rx->u.rx.ra_match)
3711 return TXRX_CONTINUE;
3712
3713 /* Check for weak IVs, if hwaccel did not remove IV from the frame */
3714 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) ||
3715 rx->key->force_sw_encrypt) {
3716 u8 *iv = ieee80211_wep_is_weak_iv(rx->skb, rx->key);
3717 if (iv) {
3718 rx->sta->wep_weak_iv_count++;
3719 }
3720 }
3721
3722 return TXRX_CONTINUE;
3723 }
3724
3725
3726 static ieee80211_txrx_result
3727 ieee80211_rx_h_wep_decrypt(struct ieee80211_txrx_data *rx)
3728 {
3729 /* If the device handles decryption totally, skip this test */
3730 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3731 return TXRX_CONTINUE;
3732
3733 if ((rx->key && rx->key->alg != ALG_WEP) ||
3734 !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
3735 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3736 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3737 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)))
3738 return TXRX_CONTINUE;
3739
3740 if (!rx->key) {
3741 printk(KERN_DEBUG "%s: RX WEP frame, but no key set\n",
3742 rx->dev->name);
3743 return TXRX_DROP;
3744 }
3745
3746 if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED) ||
3747 rx->key->force_sw_encrypt) {
3748 if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
3749 printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
3750 "failed\n", rx->dev->name);
3751 return TXRX_DROP;
3752 }
3753 } else if (rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) {
3754 ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
3755 /* remove ICV */
3756 skb_trim(rx->skb, rx->skb->len - 4);
3757 }
3758
3759 return TXRX_CONTINUE;
3760 }
3761
3762
3763 static ieee80211_txrx_result
3764 ieee80211_rx_h_802_1x_pae(struct ieee80211_txrx_data *rx)
3765 {
3766 if (rx->sdata->eapol && ieee80211_is_eapol(rx->skb) &&
3767 rx->sdata->type != IEEE80211_IF_TYPE_STA && rx->u.rx.ra_match) {
3768 /* Pass both encrypted and unencrypted EAPOL frames to user
3769 * space for processing. */
3770 if (!rx->local->apdev)
3771 return TXRX_DROP;
3772 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3773 ieee80211_msg_normal);
3774 return TXRX_QUEUED;
3775 }
3776
3777 if (unlikely(rx->sdata->ieee802_1x &&
3778 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3779 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3780 (!rx->sta || !(rx->sta->flags & WLAN_STA_AUTHORIZED)) &&
3781 !ieee80211_is_eapol(rx->skb))) {
3782 #ifdef CONFIG_MAC80211_DEBUG
3783 struct ieee80211_hdr *hdr =
3784 (struct ieee80211_hdr *) rx->skb->data;
3785 printk(KERN_DEBUG "%s: dropped frame from " MAC_FMT
3786 " (unauthorized port)\n", rx->dev->name,
3787 MAC_ARG(hdr->addr2));
3788 #endif /* CONFIG_MAC80211_DEBUG */
3789 return TXRX_DROP;
3790 }
3791
3792 return TXRX_CONTINUE;
3793 }
3794
3795
3796 static ieee80211_txrx_result
3797 ieee80211_rx_h_drop_unencrypted(struct ieee80211_txrx_data *rx)
3798 {
3799 /* If the device handles decryption totally, skip this test */
3800 if (rx->local->hw.flags & IEEE80211_HW_DEVICE_HIDES_WEP)
3801 return TXRX_CONTINUE;
3802
3803 /* Drop unencrypted frames if key is set. */
3804 if (unlikely(!(rx->fc & IEEE80211_FCTL_PROTECTED) &&
3805 (rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
3806 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_NULLFUNC &&
3807 (rx->key || rx->sdata->drop_unencrypted) &&
3808 (rx->sdata->eapol == 0 ||
3809 !ieee80211_is_eapol(rx->skb)))) {
3810 printk(KERN_DEBUG "%s: RX non-WEP frame, but expected "
3811 "encryption\n", rx->dev->name);
3812 return TXRX_DROP;
3813 }
3814 return TXRX_CONTINUE;
3815 }
3816
3817
3818 static ieee80211_txrx_result
3819 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
3820 {
3821 struct ieee80211_sub_if_data *sdata;
3822
3823 if (!rx->u.rx.ra_match)
3824 return TXRX_DROP;
3825
3826 sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
3827 if ((sdata->type == IEEE80211_IF_TYPE_STA ||
3828 sdata->type == IEEE80211_IF_TYPE_IBSS) &&
3829 !rx->local->user_space_mlme) {
3830 ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
3831 } else {
3832 /* Management frames are sent to hostapd for processing */
3833 if (!rx->local->apdev)
3834 return TXRX_DROP;
3835 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3836 ieee80211_msg_normal);
3837 }
3838 return TXRX_QUEUED;
3839 }
3840
3841
3842 static ieee80211_txrx_result
3843 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
3844 {
3845 struct ieee80211_local *local = rx->local;
3846 struct sk_buff *skb = rx->skb;
3847
3848 if (unlikely(local->sta_scanning != 0)) {
3849 ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status);
3850 return TXRX_QUEUED;
3851 }
3852
3853 if (unlikely(rx->u.rx.in_scan)) {
3854 /* scanning finished during invoking of handlers */
3855 I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
3856 return TXRX_DROP;
3857 }
3858
3859 return TXRX_CONTINUE;
3860 }
3861
3862
3863 static void ieee80211_rx_michael_mic_report(struct net_device *dev,
3864 struct ieee80211_hdr *hdr,
3865 struct sta_info *sta,
3866 struct ieee80211_txrx_data *rx)
3867 {
3868 int keyidx, hdrlen;
3869
3870 hdrlen = ieee80211_get_hdrlen_from_skb(rx->skb);
3871 if (rx->skb->len >= hdrlen + 4)
3872 keyidx = rx->skb->data[hdrlen + 3] >> 6;
3873 else
3874 keyidx = -1;
3875
3876 /* TODO: verify that this is not triggered by fragmented
3877 * frames (hw does not verify MIC for them). */
3878 printk(KERN_DEBUG "%s: TKIP hwaccel reported Michael MIC "
3879 "failure from " MAC_FMT " to " MAC_FMT " keyidx=%d\n",
3880 dev->name, MAC_ARG(hdr->addr2), MAC_ARG(hdr->addr1), keyidx);
3881
3882 if (!sta) {
3883 /* Some hardware versions seem to generate incorrect
3884 * Michael MIC reports; ignore them to avoid triggering
3885 * countermeasures. */
3886 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3887 "error for unknown address " MAC_FMT "\n",
3888 dev->name, MAC_ARG(hdr->addr2));
3889 goto ignore;
3890 }
3891
3892 if (!(rx->fc & IEEE80211_FCTL_PROTECTED)) {
3893 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3894 "error for a frame with no ISWEP flag (src "
3895 MAC_FMT ")\n", dev->name, MAC_ARG(hdr->addr2));
3896 goto ignore;
3897 }
3898
3899 if ((rx->local->hw.flags & IEEE80211_HW_WEP_INCLUDE_IV) &&
3900 rx->sdata->type == IEEE80211_IF_TYPE_AP) {
3901 keyidx = ieee80211_wep_get_keyidx(rx->skb);
3902 /* AP with Pairwise keys support should never receive Michael
3903 * MIC errors for non-zero keyidx because these are reserved
3904 * for group keys and only the AP is sending real multicast
3905 * frames in BSS. */
3906 if (keyidx) {
3907 printk(KERN_DEBUG "%s: ignored Michael MIC error for "
3908 "a frame with non-zero keyidx (%d) (src " MAC_FMT
3909 ")\n", dev->name, keyidx, MAC_ARG(hdr->addr2));
3910 goto ignore;
3911 }
3912 }
3913
3914 if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
3915 ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
3916 (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH)) {
3917 printk(KERN_DEBUG "%s: ignored spurious Michael MIC "
3918 "error for a frame that cannot be encrypted "
3919 "(fc=0x%04x) (src " MAC_FMT ")\n",
3920 dev->name, rx->fc, MAC_ARG(hdr->addr2));
3921 goto ignore;
3922 }
3923
3924 do {
3925 union iwreq_data wrqu;
3926 char *buf = kmalloc(128, GFP_ATOMIC);
3927 if (!buf)
3928 break;
3929
3930 /* TODO: needed parameters: count, key type, TSC */
3931 sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
3932 "keyid=%d %scast addr=" MAC_FMT ")",
3933 keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
3934 MAC_ARG(hdr->addr2));
3935 memset(&wrqu, 0, sizeof(wrqu));
3936 wrqu.data.length = strlen(buf);
3937 wireless_send_event(rx->dev, IWEVCUSTOM, &wrqu, buf);
3938 kfree(buf);
3939 } while (0);
3940
3941 /* TODO: consider verifying the MIC error report with software
3942 * implementation if we get too many spurious reports from the
3943 * hardware. */
3944 if (!rx->local->apdev)
3945 goto ignore;
3946 ieee80211_rx_mgmt(rx->local, rx->skb, rx->u.rx.status,
3947 ieee80211_msg_michael_mic_failure);
3948 return;
3949
3950 ignore:
3951 dev_kfree_skb(rx->skb);
3952 rx->skb = NULL;
3953 }
3954
3955 static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
3956 struct ieee80211_local *local,
3957 ieee80211_rx_handler *handlers,
3958 struct ieee80211_txrx_data *rx,
3959 struct sta_info *sta)
3960 {
3961 ieee80211_rx_handler *handler;
3962 ieee80211_txrx_result res = TXRX_DROP;
3963
3964 for (handler = handlers; *handler != NULL; handler++) {
3965 res = (*handler)(rx);
3966 if (res != TXRX_CONTINUE) {
3967 if (res == TXRX_DROP) {
3968 I802_DEBUG_INC(local->rx_handlers_drop);
3969 if (sta)
3970 sta->rx_dropped++;
3971 }
3972 if (res == TXRX_QUEUED)
3973 I802_DEBUG_INC(local->rx_handlers_queued);
3974 break;
3975 }
3976 }
3977
3978 if (res == TXRX_DROP) {
3979 dev_kfree_skb(rx->skb);
3980 }
3981 return res;
3982 }
3983
3984 static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
3985 ieee80211_rx_handler *handlers,
3986 struct ieee80211_txrx_data *rx,
3987 struct sta_info *sta)
3988 {
3989 if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
3990 TXRX_CONTINUE)
3991 dev_kfree_skb(rx->skb);
3992 }
3993
3994 /*
3995 * This is the receive path handler. It is called by a low level driver when an
3996 * 802.11 MPDU is received from the hardware.
3997 */
3998 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
3999 struct ieee80211_rx_status *status)
4000 {
4001 struct ieee80211_local *local = hw_to_local(hw);
4002 struct ieee80211_sub_if_data *sdata;
4003 struct sta_info *sta;
4004 struct ieee80211_hdr *hdr;
4005 struct ieee80211_txrx_data rx;
4006 u16 type;
4007 int multicast;
4008 int radiotap_len = 0;
4009
4010 if (status->flag & RX_FLAG_RADIOTAP) {
4011 radiotap_len = ieee80211_get_radiotap_len(skb);
4012 skb_pull(skb, radiotap_len);
4013 }
4014
4015 hdr = (struct ieee80211_hdr *) skb->data;
4016 memset(&rx, 0, sizeof(rx));
4017 rx.skb = skb;
4018 rx.local = local;
4019
4020 rx.u.rx.status = status;
4021 rx.fc = skb->len >= 2 ? le16_to_cpu(hdr->frame_control) : 0;
4022 type = rx.fc & IEEE80211_FCTL_FTYPE;
4023 if (type == IEEE80211_FTYPE_DATA || type == IEEE80211_FTYPE_MGMT)
4024 local->dot11ReceivedFragmentCount++;
4025 multicast = is_multicast_ether_addr(hdr->addr1);
4026
4027 if (skb->len >= 16)
4028 sta = rx.sta = sta_info_get(local, hdr->addr2);
4029 else
4030 sta = rx.sta = NULL;
4031
4032 if (sta) {
4033 rx.dev = sta->dev;
4034 rx.sdata = IEEE80211_DEV_TO_SUB_IF(rx.dev);
4035 }
4036
4037 if ((status->flag & RX_FLAG_MMIC_ERROR)) {
4038 ieee80211_rx_michael_mic_report(local->mdev, hdr, sta, &rx);
4039 goto end;
4040 }
4041
4042 if (unlikely(local->sta_scanning))
4043 rx.u.rx.in_scan = 1;
4044
4045 if (__ieee80211_invoke_rx_handlers(local, local->rx_pre_handlers, &rx,
4046 sta) != TXRX_CONTINUE)
4047 goto end;
4048 skb = rx.skb;
4049
4050 skb_push(skb, radiotap_len);
4051 if (sta && !sta->assoc_ap && !(sta->flags & WLAN_STA_WDS) &&
4052 !local->iff_promiscs && !multicast) {
4053 rx.u.rx.ra_match = 1;
4054 ieee80211_invoke_rx_handlers(local, local->rx_handlers, &rx,
4055 sta);
4056 } else {
4057 struct ieee80211_sub_if_data *prev = NULL;
4058 struct sk_buff *skb_new;
4059 u8 *bssid = ieee80211_get_bssid(hdr, skb->len - radiotap_len);
4060
4061 read_lock(&local->sub_if_lock);
4062 list_for_each_entry(sdata, &local->sub_if_list, list) {
4063 rx.u.rx.ra_match = 1;
4064 switch (sdata->type) {
4065 case IEEE80211_IF_TYPE_STA:
4066 if (!bssid)
4067 continue;
4068 if (!ieee80211_bssid_match(bssid,
4069 sdata->u.sta.bssid)) {
4070 if (!rx.u.rx.in_scan)
4071 continue;
4072 rx.u.rx.ra_match = 0;
4073 } else if (!multicast &&
4074 compare_ether_addr(sdata->dev->dev_addr,
4075 hdr->addr1) != 0) {
4076 if (!sdata->promisc)
4077 continue;
4078 rx.u.rx.ra_match = 0;
4079 }
4080 break;
4081 case IEEE80211_IF_TYPE_IBSS:
4082 if (!bssid)
4083 continue;
4084 if (!ieee80211_bssid_match(bssid,
4085 sdata->u.sta.bssid)) {
4086 if (!rx.u.rx.in_scan)
4087 continue;
4088 rx.u.rx.ra_match = 0;
4089 } else if (!multicast &&
4090 compare_ether_addr(sdata->dev->dev_addr,
4091 hdr->addr1) != 0) {
4092 if (!sdata->promisc)
4093 continue;
4094 rx.u.rx.ra_match = 0;
4095 } else if (!sta)
4096 sta = rx.sta =
4097 ieee80211_ibss_add_sta(sdata->dev,
4098 skb, bssid,
4099 hdr->addr2);
4100 break;
4101 case IEEE80211_IF_TYPE_AP:
4102 if (!bssid) {
4103 if (compare_ether_addr(sdata->dev->dev_addr,
4104 hdr->addr1) != 0)
4105 continue;
4106 } else if (!ieee80211_bssid_match(bssid,
4107 sdata->dev->dev_addr)) {
4108 if (!rx.u.rx.in_scan)
4109 continue;
4110 rx.u.rx.ra_match = 0;
4111 }
4112 if (sdata->dev == local->mdev &&
4113 !rx.u.rx.in_scan)
4114 /* do not receive anything via
4115 * master device when not scanning */
4116 continue;
4117 break;
4118 case IEEE80211_IF_TYPE_WDS:
4119 if (bssid ||
4120 (rx.fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
4121 continue;
4122 if (compare_ether_addr(sdata->u.wds.remote_addr,
4123 hdr->addr2) != 0)
4124 continue;
4125 break;
4126 }
4127
4128 if (prev) {
4129 skb_new = skb_copy(skb, GFP_ATOMIC);
4130 if (!skb_new) {
4131 if (net_ratelimit())
4132 printk(KERN_DEBUG "%s: failed to copy "
4133 "multicast frame for %s",
4134 local->mdev->name, prev->dev->name);
4135 continue;
4136 }
4137 rx.skb = skb_new;
4138 rx.dev = prev->dev;
4139 rx.sdata = prev;
4140 ieee80211_invoke_rx_handlers(local,
4141 local->rx_handlers,
4142 &rx, sta);
4143 }
4144 prev = sdata;
4145 }
4146 if (prev) {
4147 rx.skb = skb;
4148 rx.dev = prev->dev;
4149 rx.sdata = prev;
4150 ieee80211_invoke_rx_handlers(local, local->rx_handlers,
4151 &rx, sta);
4152 } else
4153 dev_kfree_skb(skb);
4154 read_unlock(&local->sub_if_lock);
4155 }
4156
4157 end:
4158 if (sta)
4159 sta_info_put(sta);
4160 }
4161 EXPORT_SYMBOL(__ieee80211_rx);
4162
4163 static ieee80211_txrx_result
4164 ieee80211_tx_h_load_stats(struct ieee80211_txrx_data *tx)
4165 {
4166 struct ieee80211_local *local = tx->local;
4167 struct ieee80211_hw_mode *mode = tx->u.tx.mode;
4168 struct sk_buff *skb = tx->skb;
4169 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4170 u32 load = 0, hdrtime;
4171
4172 /* TODO: this could be part of tx_status handling, so that the number
4173 * of retries would be known; TX rate should in that case be stored
4174 * somewhere with the packet */
4175
4176 /* Estimate total channel use caused by this frame */
4177
4178 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4179 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4180
4181 if (mode->mode == MODE_IEEE80211A ||
4182 mode->mode == MODE_ATHEROS_TURBO ||
4183 mode->mode == MODE_ATHEROS_TURBOG ||
4184 (mode->mode == MODE_IEEE80211G &&
4185 tx->u.tx.rate->flags & IEEE80211_RATE_ERP))
4186 hdrtime = CHAN_UTIL_HDR_SHORT;
4187 else
4188 hdrtime = CHAN_UTIL_HDR_LONG;
4189
4190 load = hdrtime;
4191 if (!is_multicast_ether_addr(hdr->addr1))
4192 load += hdrtime;
4193
4194 if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_RTS_CTS)
4195 load += 2 * hdrtime;
4196 else if (tx->u.tx.control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
4197 load += hdrtime;
4198
4199 load += skb->len * tx->u.tx.rate->rate_inv;
4200
4201 if (tx->u.tx.extra_frag) {
4202 int i;
4203 for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
4204 load += 2 * hdrtime;
4205 load += tx->u.tx.extra_frag[i]->len *
4206 tx->u.tx.rate->rate;
4207 }
4208 }
4209
4210 /* Divide channel_use by 8 to avoid wrapping around the counter */
4211 load >>= CHAN_UTIL_SHIFT;
4212 local->channel_use_raw += load;
4213 if (tx->sta)
4214 tx->sta->channel_use_raw += load;
4215 tx->sdata->channel_use_raw += load;
4216
4217 return TXRX_CONTINUE;
4218 }
4219
4220
4221 static ieee80211_txrx_result
4222 ieee80211_rx_h_load_stats(struct ieee80211_txrx_data *rx)
4223 {
4224 struct ieee80211_local *local = rx->local;
4225 struct sk_buff *skb = rx->skb;
4226 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4227 u32 load = 0, hdrtime;
4228 struct ieee80211_rate *rate;
4229 struct ieee80211_hw_mode *mode = local->hw.conf.mode;
4230 int i;
4231
4232 /* Estimate total channel use caused by this frame */
4233
4234 if (unlikely(mode->num_rates < 0))
4235 return TXRX_CONTINUE;
4236
4237 rate = &mode->rates[0];
4238 for (i = 0; i < mode->num_rates; i++) {
4239 if (mode->rates[i].val == rx->u.rx.status->rate) {
4240 rate = &mode->rates[i];
4241 break;
4242 }
4243 }
4244
4245 /* 1 bit at 1 Mbit/s takes 1 usec; in channel_use values,
4246 * 1 usec = 1/8 * (1080 / 10) = 13.5 */
4247
4248 if (mode->mode == MODE_IEEE80211A ||
4249 mode->mode == MODE_ATHEROS_TURBO ||
4250 mode->mode == MODE_ATHEROS_TURBOG ||
4251 (mode->mode == MODE_IEEE80211G &&
4252 rate->flags & IEEE80211_RATE_ERP))
4253 hdrtime = CHAN_UTIL_HDR_SHORT;
4254 else
4255 hdrtime = CHAN_UTIL_HDR_LONG;
4256
4257 load = hdrtime;
4258 if (!is_multicast_ether_addr(hdr->addr1))
4259 load += hdrtime;
4260
4261 load += skb->len * rate->rate_inv;
4262
4263 /* Divide channel_use by 8 to avoid wrapping around the counter */
4264 load >>= CHAN_UTIL_SHIFT;
4265 local->channel_use_raw += load;
4266 if (rx->sta)
4267 rx->sta->channel_use_raw += load;
4268 rx->u.rx.load = load;
4269
4270 return TXRX_CONTINUE;
4271 }
4272
4273 static ieee80211_txrx_result
4274 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
4275 {
4276 rx->sdata->channel_use_raw += rx->u.rx.load;
4277 return TXRX_CONTINUE;
4278 }
4279
4280 static void ieee80211_stat_refresh(unsigned long data)
4281 {
4282 struct ieee80211_local *local = (struct ieee80211_local *) data;
4283 struct sta_info *sta;
4284 struct ieee80211_sub_if_data *sdata;
4285
4286 if (!local->stat_time)
4287 return;
4288
4289 /* go through all stations */
4290 spin_lock_bh(&local->sta_lock);
4291 list_for_each_entry(sta, &local->sta_list, list) {
4292 sta->channel_use = (sta->channel_use_raw / local->stat_time) /
4293 CHAN_UTIL_PER_10MS;
4294 sta->channel_use_raw = 0;
4295 }
4296 spin_unlock_bh(&local->sta_lock);
4297
4298 /* go through all subinterfaces */
4299 read_lock(&local->sub_if_lock);
4300 list_for_each_entry(sdata, &local->sub_if_list, list) {
4301 sdata->channel_use = (sdata->channel_use_raw /
4302 local->stat_time) / CHAN_UTIL_PER_10MS;
4303 sdata->channel_use_raw = 0;
4304 }
4305 read_unlock(&local->sub_if_lock);
4306
4307 /* hardware interface */
4308 local->channel_use = (local->channel_use_raw /
4309 local->stat_time) / CHAN_UTIL_PER_10MS;
4310 local->channel_use_raw = 0;
4311
4312 local->stat_timer.expires = jiffies + HZ * local->stat_time / 100;
4313 add_timer(&local->stat_timer);
4314 }
4315
4316
4317 /* This is a version of the rx handler that can be called from hard irq
4318 * context. Post the skb on the queue and schedule the tasklet */
4319 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb,
4320 struct ieee80211_rx_status *status)
4321 {
4322 struct ieee80211_local *local = hw_to_local(hw);
4323
4324 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
4325
4326 skb->dev = local->mdev;
4327 /* copy status into skb->cb for use by tasklet */
4328 memcpy(skb->cb, status, sizeof(*status));
4329 skb->pkt_type = IEEE80211_RX_MSG;
4330 skb_queue_tail(&local->skb_queue, skb);
4331 tasklet_schedule(&local->tasklet);
4332 }
4333 EXPORT_SYMBOL(ieee80211_rx_irqsafe);
4334
4335 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
4336 struct sk_buff *skb,
4337 struct ieee80211_tx_status *status)
4338 {
4339 struct ieee80211_local *local = hw_to_local(hw);
4340 struct ieee80211_tx_status *saved;
4341 int tmp;
4342
4343 skb->dev = local->mdev;
4344 saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
4345 if (unlikely(!saved)) {
4346 if (net_ratelimit())
4347 printk(KERN_WARNING "%s: Not enough memory, "
4348 "dropping tx status", skb->dev->name);
4349 /* should be dev_kfree_skb_irq, but due to this function being
4350 * named _irqsafe instead of just _irq we can't be sure that
4351 * people won't call it from non-irq contexts */
4352 dev_kfree_skb_any(skb);
4353 return;
4354 }
4355 memcpy(saved, status, sizeof(struct ieee80211_tx_status));
4356 /* copy pointer to saved status into skb->cb for use by tasklet */
4357 memcpy(skb->cb, &saved, sizeof(saved));
4358
4359 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
4360 skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
4361 &local->skb_queue : &local->skb_queue_unreliable, skb);
4362 tmp = skb_queue_len(&local->skb_queue) +
4363 skb_queue_len(&local->skb_queue_unreliable);
4364 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
4365 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4366 memcpy(&saved, skb->cb, sizeof(saved));
4367 kfree(saved);
4368 dev_kfree_skb_irq(skb);
4369 tmp--;
4370 I802_DEBUG_INC(local->tx_status_drop);
4371 }
4372 tasklet_schedule(&local->tasklet);
4373 }
4374 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
4375
4376 static void ieee80211_tasklet_handler(unsigned long data)
4377 {
4378 struct ieee80211_local *local = (struct ieee80211_local *) data;
4379 struct sk_buff *skb;
4380 struct ieee80211_rx_status rx_status;
4381 struct ieee80211_tx_status *tx_status;
4382
4383 while ((skb = skb_dequeue(&local->skb_queue)) ||
4384 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
4385 switch (skb->pkt_type) {
4386 case IEEE80211_RX_MSG:
4387 /* status is in skb->cb */
4388 memcpy(&rx_status, skb->cb, sizeof(rx_status));
4389 /* Clear skb->type in order to not confuse kernel
4390 * netstack. */
4391 skb->pkt_type = 0;
4392 __ieee80211_rx(local_to_hw(local), skb, &rx_status);
4393 break;
4394 case IEEE80211_TX_STATUS_MSG:
4395 /* get pointer to saved status out of skb->cb */
4396 memcpy(&tx_status, skb->cb, sizeof(tx_status));
4397 skb->pkt_type = 0;
4398 ieee80211_tx_status(local_to_hw(local),
4399 skb, tx_status);
4400 kfree(tx_status);
4401 break;
4402 default: /* should never get here! */
4403 printk(KERN_ERR "%s: Unknown message type (%d)\n",
4404 local->mdev->name, skb->pkt_type);
4405 dev_kfree_skb(skb);
4406 break;
4407 }
4408 }
4409 }
4410
4411
4412 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
4413 * make a prepared TX frame (one that has been given to hw) to look like brand
4414 * new IEEE 802.11 frame that is ready to go through TX processing again.
4415 * Also, tx_packet_data in cb is restored from tx_control. */
4416 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
4417 struct ieee80211_key *key,
4418 struct sk_buff *skb,
4419 struct ieee80211_tx_control *control)
4420 {
4421 int hdrlen, iv_len, mic_len;
4422 struct ieee80211_tx_packet_data *pkt_data;
4423
4424 pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
4425 pkt_data->ifindex = control->ifindex;
4426 pkt_data->mgmt_iface = (control->type == IEEE80211_IF_TYPE_MGMT);
4427 pkt_data->req_tx_status = !!(control->flags & IEEE80211_TXCTL_REQ_TX_STATUS);
4428 pkt_data->do_not_encrypt = !!(control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT);
4429 pkt_data->requeue = !!(control->flags & IEEE80211_TXCTL_REQUEUE);
4430 pkt_data->queue = control->queue;
4431
4432 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
4433
4434 if (!key)
4435 goto no_key;
4436
4437 switch (key->alg) {
4438 case ALG_WEP:
4439 iv_len = WEP_IV_LEN;
4440 mic_len = WEP_ICV_LEN;
4441 break;
4442 case ALG_TKIP:
4443 iv_len = TKIP_IV_LEN;
4444 mic_len = TKIP_ICV_LEN;
4445 break;
4446 case ALG_CCMP:
4447 iv_len = CCMP_HDR_LEN;
4448 mic_len = CCMP_MIC_LEN;
4449 break;
4450 default:
4451 goto no_key;
4452 }
4453
4454 if (skb->len >= mic_len && key->force_sw_encrypt)
4455 skb_trim(skb, skb->len - mic_len);
4456 if (skb->len >= iv_len && skb->len > hdrlen) {
4457 memmove(skb->data + iv_len, skb->data, hdrlen);
4458 skb_pull(skb, iv_len);
4459 }
4460
4461 no_key:
4462 {
4463 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4464 u16 fc = le16_to_cpu(hdr->frame_control);
4465 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
4466 fc &= ~IEEE80211_STYPE_QOS_DATA;
4467 hdr->frame_control = cpu_to_le16(fc);
4468 memmove(skb->data + 2, skb->data, hdrlen - 2);
4469 skb_pull(skb, 2);
4470 }
4471 }
4472 }
4473
4474
4475 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
4476 struct ieee80211_tx_status *status)
4477 {
4478 struct sk_buff *skb2;
4479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
4480 struct ieee80211_local *local = hw_to_local(hw);
4481 u16 frag, type;
4482 u32 msg_type;
4483 struct ieee80211_tx_status_rtap_hdr *rthdr;
4484 struct ieee80211_sub_if_data *sdata;
4485 int monitors;
4486
4487 if (!status) {
4488 printk(KERN_ERR
4489 "%s: ieee80211_tx_status called with NULL status\n",
4490 local->mdev->name);
4491 dev_kfree_skb(skb);
4492 return;
4493 }
4494
4495 if (status->excessive_retries) {
4496 struct sta_info *sta;
4497 sta = sta_info_get(local, hdr->addr1);
4498 if (sta) {
4499 if (sta->flags & WLAN_STA_PS) {
4500 /* The STA is in power save mode, so assume
4501 * that this TX packet failed because of that.
4502 */
4503 status->excessive_retries = 0;
4504 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
4505 }
4506 sta_info_put(sta);
4507 }
4508 }
4509
4510 if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
4511 struct sta_info *sta;
4512 sta = sta_info_get(local, hdr->addr1);
4513 if (sta) {
4514 sta->tx_filtered_count++;
4515
4516 /* Clear the TX filter mask for this STA when sending
4517 * the next packet. If the STA went to power save mode,
4518 * this will happen when it is waking up for the next
4519 * time. */
4520 sta->clear_dst_mask = 1;
4521
4522 /* TODO: Is the WLAN_STA_PS flag always set here or is
4523 * the race between RX and TX status causing some
4524 * packets to be filtered out before 80211.o gets an
4525 * update for PS status? This seems to be the case, so
4526 * no changes are likely to be needed. */
4527 if (sta->flags & WLAN_STA_PS &&
4528 skb_queue_len(&sta->tx_filtered) <
4529 STA_MAX_TX_BUFFER) {
4530 ieee80211_remove_tx_extra(local, sta->key,
4531 skb,
4532 &status->control);
4533 skb_queue_tail(&sta->tx_filtered, skb);
4534 } else if (!(sta->flags & WLAN_STA_PS) &&
4535 !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
4536 /* Software retry the packet once */
4537 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
4538 ieee80211_remove_tx_extra(local, sta->key,
4539 skb,
4540 &status->control);
4541 dev_queue_xmit(skb);
4542 } else {
4543 if (net_ratelimit()) {
4544 printk(KERN_DEBUG "%s: dropped TX "
4545 "filtered frame queue_len=%d "
4546 "PS=%d @%lu\n",
4547 local->mdev->name,
4548 skb_queue_len(
4549 &sta->tx_filtered),
4550 !!(sta->flags & WLAN_STA_PS),
4551 jiffies);
4552 }
4553 dev_kfree_skb(skb);
4554 }
4555 sta_info_put(sta);
4556 return;
4557 }
4558 } else {
4559 /* FIXME: STUPID to call this with both local and local->mdev */
4560 rate_control_tx_status(local, local->mdev, skb, status);
4561 }
4562
4563 ieee80211_led_tx(local, 0);
4564
4565 /* SNMP counters
4566 * Fragments are passed to low-level drivers as separate skbs, so these
4567 * are actually fragments, not frames. Update frame counters only for
4568 * the first fragment of the frame. */
4569
4570 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
4571 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
4572
4573 if (status->flags & IEEE80211_TX_STATUS_ACK) {
4574 if (frag == 0) {
4575 local->dot11TransmittedFrameCount++;
4576 if (is_multicast_ether_addr(hdr->addr1))
4577 local->dot11MulticastTransmittedFrameCount++;
4578 if (status->retry_count > 0)
4579 local->dot11RetryCount++;
4580 if (status->retry_count > 1)
4581 local->dot11MultipleRetryCount++;
4582 }
4583
4584 /* This counter shall be incremented for an acknowledged MPDU
4585 * with an individual address in the address 1 field or an MPDU
4586 * with a multicast address in the address 1 field of type Data
4587 * or Management. */
4588 if (!is_multicast_ether_addr(hdr->addr1) ||
4589 type == IEEE80211_FTYPE_DATA ||
4590 type == IEEE80211_FTYPE_MGMT)
4591 local->dot11TransmittedFragmentCount++;
4592 } else {
4593 if (frag == 0)
4594 local->dot11FailedCount++;
4595 }
4596
4597 msg_type = (status->flags & IEEE80211_TX_STATUS_ACK) ?
4598 ieee80211_msg_tx_callback_ack : ieee80211_msg_tx_callback_fail;
4599
4600 /* this was a transmitted frame, but now we want to reuse it */
4601 skb_orphan(skb);
4602
4603 if ((status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS) &&
4604 local->apdev) {
4605 if (local->monitors) {
4606 skb2 = skb_clone(skb, GFP_ATOMIC);
4607 } else {
4608 skb2 = skb;
4609 skb = NULL;
4610 }
4611
4612 if (skb2)
4613 /* Send frame to hostapd */
4614 ieee80211_rx_mgmt(local, skb2, NULL, msg_type);
4615
4616 if (!skb)
4617 return;
4618 }
4619
4620 if (!local->monitors) {
4621 dev_kfree_skb(skb);
4622 return;
4623 }
4624
4625 /* send frame to monitor interfaces now */
4626
4627 if (skb_headroom(skb) < sizeof(*rthdr)) {
4628 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
4629 dev_kfree_skb(skb);
4630 return;
4631 }
4632
4633 rthdr = (struct ieee80211_tx_status_rtap_hdr*)
4634 skb_push(skb, sizeof(*rthdr));
4635
4636 memset(rthdr, 0, sizeof(*rthdr));
4637 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
4638 rthdr->hdr.it_present =
4639 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
4640 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
4641
4642 if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
4643 !is_multicast_ether_addr(hdr->addr1))
4644 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
4645
4646 if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
4647 (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
4648 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
4649 else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
4650 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
4651
4652 rthdr->data_retries = status->retry_count;
4653
4654 read_lock(&local->sub_if_lock);
4655 monitors = local->monitors;
4656 list_for_each_entry(sdata, &local->sub_if_list, list) {
4657 /*
4658 * Using the monitors counter is possibly racy, but
4659 * if the value is wrong we simply either clone the skb
4660 * once too much or forget sending it to one monitor iface
4661 * The latter case isn't nice but fixing the race is much
4662 * more complicated.
4663 */
4664 if (!monitors || !skb)
4665 goto out;
4666
4667 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
4668 if (!netif_running(sdata->dev))
4669 continue;
4670 monitors--;
4671 if (monitors)
4672 skb2 = skb_clone(skb, GFP_KERNEL);
4673 else
4674 skb2 = NULL;
4675 skb->dev = sdata->dev;
4676 /* XXX: is this sufficient for BPF? */
4677 skb_set_mac_header(skb, 0);
4678 skb->ip_summed = CHECKSUM_UNNECESSARY;
4679 skb->pkt_type = PACKET_OTHERHOST;
4680 skb->protocol = htons(ETH_P_802_2);
4681 memset(skb->cb, 0, sizeof(skb->cb));
4682 netif_rx(skb);
4683 skb = skb2;
4684 break;
4685 }
4686 }
4687 out:
4688 read_unlock(&local->sub_if_lock);
4689 if (skb)
4690 dev_kfree_skb(skb);
4691 }
4692 EXPORT_SYMBOL(ieee80211_tx_status);
4693
4694 /* TODO: implement register/unregister functions for adding TX/RX handlers
4695 * into ordered list */
4696
4697 /* rx_pre handlers don't have dev and sdata fields available in
4698 * ieee80211_txrx_data */
4699 static ieee80211_rx_handler ieee80211_rx_pre_handlers[] =
4700 {
4701 ieee80211_rx_h_parse_qos,
4702 ieee80211_rx_h_load_stats,
4703 NULL
4704 };
4705
4706 static ieee80211_rx_handler ieee80211_rx_handlers[] =
4707 {
4708 ieee80211_rx_h_if_stats,
4709 ieee80211_rx_h_monitor,
4710 ieee80211_rx_h_passive_scan,
4711 ieee80211_rx_h_check,
4712 ieee80211_rx_h_sta_process,
4713 ieee80211_rx_h_ccmp_decrypt,
4714 ieee80211_rx_h_tkip_decrypt,
4715 ieee80211_rx_h_wep_weak_iv_detection,
4716 ieee80211_rx_h_wep_decrypt,
4717 ieee80211_rx_h_defragment,
4718 ieee80211_rx_h_ps_poll,
4719 ieee80211_rx_h_michael_mic_verify,
4720 /* this must be after decryption - so header is counted in MPDU mic
4721 * must be before pae and data, so QOS_DATA format frames
4722 * are not passed to user space by these functions
4723 */
4724 ieee80211_rx_h_remove_qos_control,
4725 ieee80211_rx_h_802_1x_pae,
4726 ieee80211_rx_h_drop_unencrypted,
4727 ieee80211_rx_h_data,
4728 ieee80211_rx_h_mgmt,
4729 NULL
4730 };
4731
4732 static ieee80211_tx_handler ieee80211_tx_handlers[] =
4733 {
4734 ieee80211_tx_h_check_assoc,
4735 ieee80211_tx_h_sequence,
4736 ieee80211_tx_h_ps_buf,
4737 ieee80211_tx_h_select_key,
4738 ieee80211_tx_h_michael_mic_add,
4739 ieee80211_tx_h_fragment,
4740 ieee80211_tx_h_tkip_encrypt,
4741 ieee80211_tx_h_ccmp_encrypt,
4742 ieee80211_tx_h_wep_encrypt,
4743 ieee80211_tx_h_rate_ctrl,
4744 ieee80211_tx_h_misc,
4745 ieee80211_tx_h_load_stats,
4746 NULL
4747 };
4748
4749
4750 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
4751 {
4752 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
4753 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4754 struct sta_info *sta;
4755
4756 if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
4757 return 0;
4758
4759 /* Create STA entry for the new peer */
4760 sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
4761 if (!sta)
4762 return -ENOMEM;
4763 sta_info_put(sta);
4764
4765 /* Remove STA entry for the old peer */
4766 sta = sta_info_get(local, sdata->u.wds.remote_addr);
4767 if (sta) {
4768 sta_info_put(sta);
4769 sta_info_free(sta, 0);
4770 } else {
4771 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
4772 "peer " MAC_FMT "\n",
4773 dev->name, MAC_ARG(sdata->u.wds.remote_addr));
4774 }
4775
4776 /* Update WDS link data */
4777 memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
4778
4779 return 0;
4780 }
4781
4782 /* Must not be called for mdev and apdev */
4783 void ieee80211_if_setup(struct net_device *dev)
4784 {
4785 ether_setup(dev);
4786 dev->hard_start_xmit = ieee80211_subif_start_xmit;
4787 dev->wireless_handlers = &ieee80211_iw_handler_def;
4788 dev->set_multicast_list = ieee80211_set_multicast_list;
4789 dev->change_mtu = ieee80211_change_mtu;
4790 dev->get_stats = ieee80211_get_stats;
4791 dev->open = ieee80211_open;
4792 dev->stop = ieee80211_stop;
4793 dev->uninit = ieee80211_if_reinit;
4794 dev->destructor = ieee80211_if_free;
4795 }
4796
4797 void ieee80211_if_mgmt_setup(struct net_device *dev)
4798 {
4799 ether_setup(dev);
4800 dev->hard_start_xmit = ieee80211_mgmt_start_xmit;
4801 dev->change_mtu = ieee80211_change_mtu_apdev;
4802 dev->get_stats = ieee80211_get_stats;
4803 dev->open = ieee80211_mgmt_open;
4804 dev->stop = ieee80211_mgmt_stop;
4805 dev->type = ARPHRD_IEEE80211_PRISM;
4806 dev->hard_header_parse = header_parse_80211;
4807 dev->uninit = ieee80211_if_reinit;
4808 dev->destructor = ieee80211_if_free;
4809 }
4810
4811 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
4812 const char *name)
4813 {
4814 struct rate_control_ref *ref, *old;
4815
4816 ASSERT_RTNL();
4817 if (local->open_count || netif_running(local->mdev) ||
4818 (local->apdev && netif_running(local->apdev)))
4819 return -EBUSY;
4820
4821 ref = rate_control_alloc(name, local);
4822 if (!ref) {
4823 printk(KERN_WARNING "%s: Failed to select rate control "
4824 "algorithm\n", local->mdev->name);
4825 return -ENOENT;
4826 }
4827
4828 old = local->rate_ctrl;
4829 local->rate_ctrl = ref;
4830 if (old) {
4831 rate_control_put(old);
4832 sta_info_flush(local, NULL);
4833 }
4834
4835 printk(KERN_DEBUG "%s: Selected rate control "
4836 "algorithm '%s'\n", local->mdev->name,
4837 ref->ops->name);
4838
4839
4840 return 0;
4841 }
4842
4843 static void rate_control_deinitialize(struct ieee80211_local *local)
4844 {
4845 struct rate_control_ref *ref;
4846
4847 ref = local->rate_ctrl;
4848 local->rate_ctrl = NULL;
4849 rate_control_put(ref);
4850 }
4851
4852 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
4853 const struct ieee80211_ops *ops)
4854 {
4855 struct net_device *mdev;
4856 struct ieee80211_local *local;
4857 struct ieee80211_sub_if_data *sdata;
4858 int priv_size;
4859 struct wiphy *wiphy;
4860
4861 /* Ensure 32-byte alignment of our private data and hw private data.
4862 * We use the wiphy priv data for both our ieee80211_local and for
4863 * the driver's private data
4864 *
4865 * In memory it'll be like this:
4866 *
4867 * +-------------------------+
4868 * | struct wiphy |
4869 * +-------------------------+
4870 * | struct ieee80211_local |
4871 * +-------------------------+
4872 * | driver's private data |
4873 * +-------------------------+
4874 *
4875 */
4876 priv_size = ((sizeof(struct ieee80211_local) +
4877 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
4878 priv_data_len;
4879
4880 wiphy = wiphy_new(&mac80211_config_ops, priv_size);
4881
4882 if (!wiphy)
4883 return NULL;
4884
4885 wiphy->privid = mac80211_wiphy_privid;
4886
4887 local = wiphy_priv(wiphy);
4888 local->hw.wiphy = wiphy;
4889
4890 local->hw.priv = (char *)local +
4891 ((sizeof(struct ieee80211_local) +
4892 NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4893
4894 local->ops = ops;
4895
4896 /* for now, mdev needs sub_if_data :/ */
4897 mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
4898 "wmaster%d", ether_setup);
4899 if (!mdev) {
4900 wiphy_free(wiphy);
4901 return NULL;
4902 }
4903
4904 sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
4905 mdev->ieee80211_ptr = &sdata->wdev;
4906 sdata->wdev.wiphy = wiphy;
4907
4908 local->hw.queues = 1; /* default */
4909
4910 local->mdev = mdev;
4911 local->rx_pre_handlers = ieee80211_rx_pre_handlers;
4912 local->rx_handlers = ieee80211_rx_handlers;
4913 local->tx_handlers = ieee80211_tx_handlers;
4914
4915 local->bridge_packets = 1;
4916
4917 local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
4918 local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
4919 local->short_retry_limit = 7;
4920 local->long_retry_limit = 4;
4921 local->hw.conf.radio_enabled = 1;
4922 local->rate_ctrl_num_up = RATE_CONTROL_NUM_UP;
4923 local->rate_ctrl_num_down = RATE_CONTROL_NUM_DOWN;
4924
4925 local->enabled_modes = (unsigned int) -1;
4926
4927 INIT_LIST_HEAD(&local->modes_list);
4928
4929 rwlock_init(&local->sub_if_lock);
4930 INIT_LIST_HEAD(&local->sub_if_list);
4931
4932 INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
4933 init_timer(&local->stat_timer);
4934 local->stat_timer.function = ieee80211_stat_refresh;
4935 local->stat_timer.data = (unsigned long) local;
4936 ieee80211_rx_bss_list_init(mdev);
4937
4938 sta_info_init(local);
4939
4940 mdev->hard_start_xmit = ieee80211_master_start_xmit;
4941 mdev->open = ieee80211_master_open;
4942 mdev->stop = ieee80211_master_stop;
4943 mdev->type = ARPHRD_IEEE80211;
4944 mdev->hard_header_parse = header_parse_80211;
4945
4946 sdata->type = IEEE80211_IF_TYPE_AP;
4947 sdata->dev = mdev;
4948 sdata->local = local;
4949 sdata->u.ap.force_unicast_rateidx = -1;
4950 sdata->u.ap.max_ratectrl_rateidx = -1;
4951 ieee80211_if_sdata_init(sdata);
4952 list_add_tail(&sdata->list, &local->sub_if_list);
4953
4954 tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
4955 (unsigned long)local);
4956 tasklet_disable(&local->tx_pending_tasklet);
4957
4958 tasklet_init(&local->tasklet,
4959 ieee80211_tasklet_handler,
4960 (unsigned long) local);
4961 tasklet_disable(&local->tasklet);
4962
4963 skb_queue_head_init(&local->skb_queue);
4964 skb_queue_head_init(&local->skb_queue_unreliable);
4965
4966 return local_to_hw(local);
4967 }
4968 EXPORT_SYMBOL(ieee80211_alloc_hw);
4969
4970 int ieee80211_register_hw(struct ieee80211_hw *hw)
4971 {
4972 struct ieee80211_local *local = hw_to_local(hw);
4973 const char *name;
4974 int result;
4975
4976 result = wiphy_register(local->hw.wiphy);
4977 if (result < 0)
4978 return result;
4979
4980 name = wiphy_dev(local->hw.wiphy)->driver->name;
4981 local->hw.workqueue = create_singlethread_workqueue(name);
4982 if (!local->hw.workqueue) {
4983 result = -ENOMEM;
4984 goto fail_workqueue;
4985 }
4986
4987 /*
4988 * The hardware needs headroom for sending the frame,
4989 * and we need some headroom for passing the frame to monitor
4990 * interfaces, but never both at the same time.
4991 */
4992 local->tx_headroom = max(local->hw.extra_tx_headroom,
4993 sizeof(struct ieee80211_tx_status_rtap_hdr));
4994
4995 debugfs_hw_add(local);
4996
4997 local->hw.conf.beacon_int = 1000;
4998
4999 local->wstats_flags |= local->hw.max_rssi ?
5000 IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
5001 local->wstats_flags |= local->hw.max_signal ?
5002 IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
5003 local->wstats_flags |= local->hw.max_noise ?
5004 IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
5005 if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
5006 local->wstats_flags |= IW_QUAL_DBM;
5007
5008 result = sta_info_start(local);
5009 if (result < 0)
5010 goto fail_sta_info;
5011
5012 rtnl_lock();
5013 result = dev_alloc_name(local->mdev, local->mdev->name);
5014 if (result < 0)
5015 goto fail_dev;
5016
5017 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
5018 SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
5019
5020 result = register_netdevice(local->mdev);
5021 if (result < 0)
5022 goto fail_dev;
5023
5024 ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5025
5026 result = ieee80211_init_rate_ctrl_alg(local, NULL);
5027 if (result < 0) {
5028 printk(KERN_DEBUG "%s: Failed to initialize rate control "
5029 "algorithm\n", local->mdev->name);
5030 goto fail_rate;
5031 }
5032
5033 result = ieee80211_wep_init(local);
5034
5035 if (result < 0) {
5036 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
5037 local->mdev->name);
5038 goto fail_wep;
5039 }
5040
5041 ieee80211_install_qdisc(local->mdev);
5042
5043 /* add one default STA interface */
5044 result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
5045 IEEE80211_IF_TYPE_STA);
5046 if (result)
5047 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
5048 local->mdev->name);
5049
5050 local->reg_state = IEEE80211_DEV_REGISTERED;
5051 rtnl_unlock();
5052
5053 ieee80211_led_init(local);
5054
5055 return 0;
5056
5057 fail_wep:
5058 rate_control_deinitialize(local);
5059 fail_rate:
5060 ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
5061 unregister_netdevice(local->mdev);
5062 fail_dev:
5063 rtnl_unlock();
5064 sta_info_stop(local);
5065 fail_sta_info:
5066 debugfs_hw_del(local);
5067 destroy_workqueue(local->hw.workqueue);
5068 fail_workqueue:
5069 wiphy_unregister(local->hw.wiphy);
5070 return result;
5071 }
5072 EXPORT_SYMBOL(ieee80211_register_hw);
5073
5074 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
5075 struct ieee80211_hw_mode *mode)
5076 {
5077 struct ieee80211_local *local = hw_to_local(hw);
5078 struct ieee80211_rate *rate;
5079 int i;
5080
5081 INIT_LIST_HEAD(&mode->list);
5082 list_add_tail(&mode->list, &local->modes_list);
5083
5084 local->hw_modes |= (1 << mode->mode);
5085 for (i = 0; i < mode->num_rates; i++) {
5086 rate = &(mode->rates[i]);
5087 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
5088 }
5089 ieee80211_prepare_rates(local, mode);
5090
5091 if (!local->oper_hw_mode) {
5092 /* Default to this mode */
5093 local->hw.conf.phymode = mode->mode;
5094 local->oper_hw_mode = local->scan_hw_mode = mode;
5095 local->oper_channel = local->scan_channel = &mode->channels[0];
5096 local->hw.conf.mode = local->oper_hw_mode;
5097 local->hw.conf.chan = local->oper_channel;
5098 }
5099
5100 if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
5101 ieee80211_init_client(local->mdev);
5102
5103 return 0;
5104 }
5105 EXPORT_SYMBOL(ieee80211_register_hwmode);
5106
5107 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
5108 {
5109 struct ieee80211_local *local = hw_to_local(hw);
5110 struct ieee80211_sub_if_data *sdata, *tmp;
5111 struct list_head tmp_list;
5112 int i;
5113
5114 tasklet_kill(&local->tx_pending_tasklet);
5115 tasklet_kill(&local->tasklet);
5116
5117 rtnl_lock();
5118
5119 BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
5120
5121 local->reg_state = IEEE80211_DEV_UNREGISTERED;
5122 if (local->apdev)
5123 ieee80211_if_del_mgmt(local);
5124
5125 write_lock_bh(&local->sub_if_lock);
5126 list_replace_init(&local->sub_if_list, &tmp_list);
5127 write_unlock_bh(&local->sub_if_lock);
5128
5129 list_for_each_entry_safe(sdata, tmp, &tmp_list, list)
5130 __ieee80211_if_del(local, sdata);
5131
5132 rtnl_unlock();
5133
5134 if (local->stat_time)
5135 del_timer_sync(&local->stat_timer);
5136
5137 ieee80211_rx_bss_list_deinit(local->mdev);
5138 ieee80211_clear_tx_pending(local);
5139 sta_info_stop(local);
5140 rate_control_deinitialize(local);
5141 debugfs_hw_del(local);
5142
5143 for (i = 0; i < NUM_IEEE80211_MODES; i++) {
5144 kfree(local->supp_rates[i]);
5145 kfree(local->basic_rates[i]);
5146 }
5147
5148 if (skb_queue_len(&local->skb_queue)
5149 || skb_queue_len(&local->skb_queue_unreliable))
5150 printk(KERN_WARNING "%s: skb_queue not empty\n",
5151 local->mdev->name);
5152 skb_queue_purge(&local->skb_queue);
5153 skb_queue_purge(&local->skb_queue_unreliable);
5154
5155 destroy_workqueue(local->hw.workqueue);
5156 wiphy_unregister(local->hw.wiphy);
5157 ieee80211_wep_free(local);
5158 ieee80211_led_exit(local);
5159 }
5160 EXPORT_SYMBOL(ieee80211_unregister_hw);
5161
5162 void ieee80211_free_hw(struct ieee80211_hw *hw)
5163 {
5164 struct ieee80211_local *local = hw_to_local(hw);
5165
5166 ieee80211_if_free(local->mdev);
5167 wiphy_free(local->hw.wiphy);
5168 }
5169 EXPORT_SYMBOL(ieee80211_free_hw);
5170
5171 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
5172 {
5173 struct ieee80211_local *local = hw_to_local(hw);
5174
5175 if (test_and_clear_bit(IEEE80211_LINK_STATE_XOFF,
5176 &local->state[queue])) {
5177 if (test_bit(IEEE80211_LINK_STATE_PENDING,
5178 &local->state[queue]))
5179 tasklet_schedule(&local->tx_pending_tasklet);
5180 else
5181 if (!ieee80211_qdisc_installed(local->mdev)) {
5182 if (queue == 0)
5183 netif_wake_queue(local->mdev);
5184 } else
5185 __netif_schedule(local->mdev);
5186 }
5187 }
5188 EXPORT_SYMBOL(ieee80211_wake_queue);
5189
5190 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
5191 {
5192 struct ieee80211_local *local = hw_to_local(hw);
5193
5194 if (!ieee80211_qdisc_installed(local->mdev) && queue == 0)
5195 netif_stop_queue(local->mdev);
5196 set_bit(IEEE80211_LINK_STATE_XOFF, &local->state[queue]);
5197 }
5198 EXPORT_SYMBOL(ieee80211_stop_queue);
5199
5200 void ieee80211_start_queues(struct ieee80211_hw *hw)
5201 {
5202 struct ieee80211_local *local = hw_to_local(hw);
5203 int i;
5204
5205 for (i = 0; i < local->hw.queues; i++)
5206 clear_bit(IEEE80211_LINK_STATE_XOFF, &local->state[i]);
5207 if (!ieee80211_qdisc_installed(local->mdev))
5208 netif_start_queue(local->mdev);
5209 }
5210 EXPORT_SYMBOL(ieee80211_start_queues);
5211
5212 void ieee80211_stop_queues(struct ieee80211_hw *hw)
5213 {
5214 int i;
5215
5216 for (i = 0; i < hw->queues; i++)
5217 ieee80211_stop_queue(hw, i);
5218 }
5219 EXPORT_SYMBOL(ieee80211_stop_queues);
5220
5221 void ieee80211_wake_queues(struct ieee80211_hw *hw)
5222 {
5223 int i;
5224
5225 for (i = 0; i < hw->queues; i++)
5226 ieee80211_wake_queue(hw, i);
5227 }
5228 EXPORT_SYMBOL(ieee80211_wake_queues);
5229
5230 struct net_device_stats *ieee80211_dev_stats(struct net_device *dev)
5231 {
5232 struct ieee80211_sub_if_data *sdata;
5233 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5234 return &sdata->stats;
5235 }
5236
5237 static int __init ieee80211_init(void)
5238 {
5239 struct sk_buff *skb;
5240 int ret;
5241
5242 BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
5243
5244 ret = ieee80211_wme_register();
5245 if (ret) {
5246 printk(KERN_DEBUG "ieee80211_init: failed to "
5247 "initialize WME (err=%d)\n", ret);
5248 return ret;
5249 }
5250
5251 ieee80211_debugfs_netdev_init();
5252
5253 return 0;
5254 }
5255
5256
5257 static void __exit ieee80211_exit(void)
5258 {
5259 ieee80211_wme_unregister();
5260 ieee80211_debugfs_netdev_exit();
5261 }
5262
5263
5264 module_init(ieee80211_init);
5265 module_exit(ieee80211_exit);
5266
5267 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
5268 MODULE_LICENSE("GPL");
Linux 2.6 libata-dev (mirror)